GNU Linux-libre 6.1.90-gnu
[releases.git] / net / ceph / osd_client.c
1 // SPDX-License-Identifier: GPL-2.0
2
3 #include <linux/ceph/ceph_debug.h>
4
5 #include <linux/module.h>
6 #include <linux/err.h>
7 #include <linux/highmem.h>
8 #include <linux/mm.h>
9 #include <linux/pagemap.h>
10 #include <linux/slab.h>
11 #include <linux/uaccess.h>
12 #ifdef CONFIG_BLOCK
13 #include <linux/bio.h>
14 #endif
15
16 #include <linux/ceph/ceph_features.h>
17 #include <linux/ceph/libceph.h>
18 #include <linux/ceph/osd_client.h>
19 #include <linux/ceph/messenger.h>
20 #include <linux/ceph/decode.h>
21 #include <linux/ceph/auth.h>
22 #include <linux/ceph/pagelist.h>
23 #include <linux/ceph/striper.h>
24
25 #define OSD_OPREPLY_FRONT_LEN   512
26
27 static struct kmem_cache        *ceph_osd_request_cache;
28
29 static const struct ceph_connection_operations osd_con_ops;
30
31 /*
32  * Implement client access to distributed object storage cluster.
33  *
34  * All data objects are stored within a cluster/cloud of OSDs, or
35  * "object storage devices."  (Note that Ceph OSDs have _nothing_ to
36  * do with the T10 OSD extensions to SCSI.)  Ceph OSDs are simply
37  * remote daemons serving up and coordinating consistent and safe
38  * access to storage.
39  *
40  * Cluster membership and the mapping of data objects onto storage devices
41  * are described by the osd map.
42  *
43  * We keep track of pending OSD requests (read, write), resubmit
44  * requests to different OSDs when the cluster topology/data layout
45  * change, or retry the affected requests when the communications
46  * channel with an OSD is reset.
47  */
48
49 static void link_request(struct ceph_osd *osd, struct ceph_osd_request *req);
50 static void unlink_request(struct ceph_osd *osd, struct ceph_osd_request *req);
51 static void link_linger(struct ceph_osd *osd,
52                         struct ceph_osd_linger_request *lreq);
53 static void unlink_linger(struct ceph_osd *osd,
54                           struct ceph_osd_linger_request *lreq);
55 static void clear_backoffs(struct ceph_osd *osd);
56
57 #if 1
58 static inline bool rwsem_is_wrlocked(struct rw_semaphore *sem)
59 {
60         bool wrlocked = true;
61
62         if (unlikely(down_read_trylock(sem))) {
63                 wrlocked = false;
64                 up_read(sem);
65         }
66
67         return wrlocked;
68 }
69 static inline void verify_osdc_locked(struct ceph_osd_client *osdc)
70 {
71         WARN_ON(!rwsem_is_locked(&osdc->lock));
72 }
73 static inline void verify_osdc_wrlocked(struct ceph_osd_client *osdc)
74 {
75         WARN_ON(!rwsem_is_wrlocked(&osdc->lock));
76 }
77 static inline void verify_osd_locked(struct ceph_osd *osd)
78 {
79         struct ceph_osd_client *osdc = osd->o_osdc;
80
81         WARN_ON(!(mutex_is_locked(&osd->lock) &&
82                   rwsem_is_locked(&osdc->lock)) &&
83                 !rwsem_is_wrlocked(&osdc->lock));
84 }
85 static inline void verify_lreq_locked(struct ceph_osd_linger_request *lreq)
86 {
87         WARN_ON(!mutex_is_locked(&lreq->lock));
88 }
89 #else
90 static inline void verify_osdc_locked(struct ceph_osd_client *osdc) { }
91 static inline void verify_osdc_wrlocked(struct ceph_osd_client *osdc) { }
92 static inline void verify_osd_locked(struct ceph_osd *osd) { }
93 static inline void verify_lreq_locked(struct ceph_osd_linger_request *lreq) { }
94 #endif
95
96 /*
97  * calculate the mapping of a file extent onto an object, and fill out the
98  * request accordingly.  shorten extent as necessary if it crosses an
99  * object boundary.
100  *
101  * fill osd op in request message.
102  */
103 static int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen,
104                         u64 *objnum, u64 *objoff, u64 *objlen)
105 {
106         u64 orig_len = *plen;
107         u32 xlen;
108
109         /* object extent? */
110         ceph_calc_file_object_mapping(layout, off, orig_len, objnum,
111                                           objoff, &xlen);
112         *objlen = xlen;
113         if (*objlen < orig_len) {
114                 *plen = *objlen;
115                 dout(" skipping last %llu, final file extent %llu~%llu\n",
116                      orig_len - *plen, off, *plen);
117         }
118
119         dout("calc_layout objnum=%llx %llu~%llu\n", *objnum, *objoff, *objlen);
120         return 0;
121 }
122
123 static void ceph_osd_data_init(struct ceph_osd_data *osd_data)
124 {
125         memset(osd_data, 0, sizeof (*osd_data));
126         osd_data->type = CEPH_OSD_DATA_TYPE_NONE;
127 }
128
129 /*
130  * Consumes @pages if @own_pages is true.
131  */
132 static void ceph_osd_data_pages_init(struct ceph_osd_data *osd_data,
133                         struct page **pages, u64 length, u32 alignment,
134                         bool pages_from_pool, bool own_pages)
135 {
136         osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
137         osd_data->pages = pages;
138         osd_data->length = length;
139         osd_data->alignment = alignment;
140         osd_data->pages_from_pool = pages_from_pool;
141         osd_data->own_pages = own_pages;
142 }
143
144 /*
145  * Consumes a ref on @pagelist.
146  */
147 static void ceph_osd_data_pagelist_init(struct ceph_osd_data *osd_data,
148                         struct ceph_pagelist *pagelist)
149 {
150         osd_data->type = CEPH_OSD_DATA_TYPE_PAGELIST;
151         osd_data->pagelist = pagelist;
152 }
153
154 #ifdef CONFIG_BLOCK
155 static void ceph_osd_data_bio_init(struct ceph_osd_data *osd_data,
156                                    struct ceph_bio_iter *bio_pos,
157                                    u32 bio_length)
158 {
159         osd_data->type = CEPH_OSD_DATA_TYPE_BIO;
160         osd_data->bio_pos = *bio_pos;
161         osd_data->bio_length = bio_length;
162 }
163 #endif /* CONFIG_BLOCK */
164
165 static void ceph_osd_data_bvecs_init(struct ceph_osd_data *osd_data,
166                                      struct ceph_bvec_iter *bvec_pos,
167                                      u32 num_bvecs)
168 {
169         osd_data->type = CEPH_OSD_DATA_TYPE_BVECS;
170         osd_data->bvec_pos = *bvec_pos;
171         osd_data->num_bvecs = num_bvecs;
172 }
173
174 static struct ceph_osd_data *
175 osd_req_op_raw_data_in(struct ceph_osd_request *osd_req, unsigned int which)
176 {
177         BUG_ON(which >= osd_req->r_num_ops);
178
179         return &osd_req->r_ops[which].raw_data_in;
180 }
181
182 struct ceph_osd_data *
183 osd_req_op_extent_osd_data(struct ceph_osd_request *osd_req,
184                         unsigned int which)
185 {
186         return osd_req_op_data(osd_req, which, extent, osd_data);
187 }
188 EXPORT_SYMBOL(osd_req_op_extent_osd_data);
189
190 void osd_req_op_raw_data_in_pages(struct ceph_osd_request *osd_req,
191                         unsigned int which, struct page **pages,
192                         u64 length, u32 alignment,
193                         bool pages_from_pool, bool own_pages)
194 {
195         struct ceph_osd_data *osd_data;
196
197         osd_data = osd_req_op_raw_data_in(osd_req, which);
198         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
199                                 pages_from_pool, own_pages);
200 }
201 EXPORT_SYMBOL(osd_req_op_raw_data_in_pages);
202
203 void osd_req_op_extent_osd_data_pages(struct ceph_osd_request *osd_req,
204                         unsigned int which, struct page **pages,
205                         u64 length, u32 alignment,
206                         bool pages_from_pool, bool own_pages)
207 {
208         struct ceph_osd_data *osd_data;
209
210         osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
211         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
212                                 pages_from_pool, own_pages);
213 }
214 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pages);
215
216 void osd_req_op_extent_osd_data_pagelist(struct ceph_osd_request *osd_req,
217                         unsigned int which, struct ceph_pagelist *pagelist)
218 {
219         struct ceph_osd_data *osd_data;
220
221         osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
222         ceph_osd_data_pagelist_init(osd_data, pagelist);
223 }
224 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pagelist);
225
226 #ifdef CONFIG_BLOCK
227 void osd_req_op_extent_osd_data_bio(struct ceph_osd_request *osd_req,
228                                     unsigned int which,
229                                     struct ceph_bio_iter *bio_pos,
230                                     u32 bio_length)
231 {
232         struct ceph_osd_data *osd_data;
233
234         osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
235         ceph_osd_data_bio_init(osd_data, bio_pos, bio_length);
236 }
237 EXPORT_SYMBOL(osd_req_op_extent_osd_data_bio);
238 #endif /* CONFIG_BLOCK */
239
240 void osd_req_op_extent_osd_data_bvecs(struct ceph_osd_request *osd_req,
241                                       unsigned int which,
242                                       struct bio_vec *bvecs, u32 num_bvecs,
243                                       u32 bytes)
244 {
245         struct ceph_osd_data *osd_data;
246         struct ceph_bvec_iter it = {
247                 .bvecs = bvecs,
248                 .iter = { .bi_size = bytes },
249         };
250
251         osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
252         ceph_osd_data_bvecs_init(osd_data, &it, num_bvecs);
253 }
254 EXPORT_SYMBOL(osd_req_op_extent_osd_data_bvecs);
255
256 void osd_req_op_extent_osd_data_bvec_pos(struct ceph_osd_request *osd_req,
257                                          unsigned int which,
258                                          struct ceph_bvec_iter *bvec_pos)
259 {
260         struct ceph_osd_data *osd_data;
261
262         osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
263         ceph_osd_data_bvecs_init(osd_data, bvec_pos, 0);
264 }
265 EXPORT_SYMBOL(osd_req_op_extent_osd_data_bvec_pos);
266
267 static void osd_req_op_cls_request_info_pagelist(
268                         struct ceph_osd_request *osd_req,
269                         unsigned int which, struct ceph_pagelist *pagelist)
270 {
271         struct ceph_osd_data *osd_data;
272
273         osd_data = osd_req_op_data(osd_req, which, cls, request_info);
274         ceph_osd_data_pagelist_init(osd_data, pagelist);
275 }
276
277 void osd_req_op_cls_request_data_pagelist(
278                         struct ceph_osd_request *osd_req,
279                         unsigned int which, struct ceph_pagelist *pagelist)
280 {
281         struct ceph_osd_data *osd_data;
282
283         osd_data = osd_req_op_data(osd_req, which, cls, request_data);
284         ceph_osd_data_pagelist_init(osd_data, pagelist);
285         osd_req->r_ops[which].cls.indata_len += pagelist->length;
286         osd_req->r_ops[which].indata_len += pagelist->length;
287 }
288 EXPORT_SYMBOL(osd_req_op_cls_request_data_pagelist);
289
290 void osd_req_op_cls_request_data_pages(struct ceph_osd_request *osd_req,
291                         unsigned int which, struct page **pages, u64 length,
292                         u32 alignment, bool pages_from_pool, bool own_pages)
293 {
294         struct ceph_osd_data *osd_data;
295
296         osd_data = osd_req_op_data(osd_req, which, cls, request_data);
297         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
298                                 pages_from_pool, own_pages);
299         osd_req->r_ops[which].cls.indata_len += length;
300         osd_req->r_ops[which].indata_len += length;
301 }
302 EXPORT_SYMBOL(osd_req_op_cls_request_data_pages);
303
304 void osd_req_op_cls_request_data_bvecs(struct ceph_osd_request *osd_req,
305                                        unsigned int which,
306                                        struct bio_vec *bvecs, u32 num_bvecs,
307                                        u32 bytes)
308 {
309         struct ceph_osd_data *osd_data;
310         struct ceph_bvec_iter it = {
311                 .bvecs = bvecs,
312                 .iter = { .bi_size = bytes },
313         };
314
315         osd_data = osd_req_op_data(osd_req, which, cls, request_data);
316         ceph_osd_data_bvecs_init(osd_data, &it, num_bvecs);
317         osd_req->r_ops[which].cls.indata_len += bytes;
318         osd_req->r_ops[which].indata_len += bytes;
319 }
320 EXPORT_SYMBOL(osd_req_op_cls_request_data_bvecs);
321
322 void osd_req_op_cls_response_data_pages(struct ceph_osd_request *osd_req,
323                         unsigned int which, struct page **pages, u64 length,
324                         u32 alignment, bool pages_from_pool, bool own_pages)
325 {
326         struct ceph_osd_data *osd_data;
327
328         osd_data = osd_req_op_data(osd_req, which, cls, response_data);
329         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
330                                 pages_from_pool, own_pages);
331 }
332 EXPORT_SYMBOL(osd_req_op_cls_response_data_pages);
333
334 static u64 ceph_osd_data_length(struct ceph_osd_data *osd_data)
335 {
336         switch (osd_data->type) {
337         case CEPH_OSD_DATA_TYPE_NONE:
338                 return 0;
339         case CEPH_OSD_DATA_TYPE_PAGES:
340                 return osd_data->length;
341         case CEPH_OSD_DATA_TYPE_PAGELIST:
342                 return (u64)osd_data->pagelist->length;
343 #ifdef CONFIG_BLOCK
344         case CEPH_OSD_DATA_TYPE_BIO:
345                 return (u64)osd_data->bio_length;
346 #endif /* CONFIG_BLOCK */
347         case CEPH_OSD_DATA_TYPE_BVECS:
348                 return osd_data->bvec_pos.iter.bi_size;
349         default:
350                 WARN(true, "unrecognized data type %d\n", (int)osd_data->type);
351                 return 0;
352         }
353 }
354
355 static void ceph_osd_data_release(struct ceph_osd_data *osd_data)
356 {
357         if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES && osd_data->own_pages) {
358                 int num_pages;
359
360                 num_pages = calc_pages_for((u64)osd_data->alignment,
361                                                 (u64)osd_data->length);
362                 ceph_release_page_vector(osd_data->pages, num_pages);
363         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
364                 ceph_pagelist_release(osd_data->pagelist);
365         }
366         ceph_osd_data_init(osd_data);
367 }
368
369 static void osd_req_op_data_release(struct ceph_osd_request *osd_req,
370                         unsigned int which)
371 {
372         struct ceph_osd_req_op *op;
373
374         BUG_ON(which >= osd_req->r_num_ops);
375         op = &osd_req->r_ops[which];
376
377         switch (op->op) {
378         case CEPH_OSD_OP_READ:
379         case CEPH_OSD_OP_WRITE:
380         case CEPH_OSD_OP_WRITEFULL:
381                 ceph_osd_data_release(&op->extent.osd_data);
382                 break;
383         case CEPH_OSD_OP_CALL:
384                 ceph_osd_data_release(&op->cls.request_info);
385                 ceph_osd_data_release(&op->cls.request_data);
386                 ceph_osd_data_release(&op->cls.response_data);
387                 break;
388         case CEPH_OSD_OP_SETXATTR:
389         case CEPH_OSD_OP_CMPXATTR:
390                 ceph_osd_data_release(&op->xattr.osd_data);
391                 break;
392         case CEPH_OSD_OP_STAT:
393                 ceph_osd_data_release(&op->raw_data_in);
394                 break;
395         case CEPH_OSD_OP_NOTIFY_ACK:
396                 ceph_osd_data_release(&op->notify_ack.request_data);
397                 break;
398         case CEPH_OSD_OP_NOTIFY:
399                 ceph_osd_data_release(&op->notify.request_data);
400                 ceph_osd_data_release(&op->notify.response_data);
401                 break;
402         case CEPH_OSD_OP_LIST_WATCHERS:
403                 ceph_osd_data_release(&op->list_watchers.response_data);
404                 break;
405         case CEPH_OSD_OP_COPY_FROM2:
406                 ceph_osd_data_release(&op->copy_from.osd_data);
407                 break;
408         default:
409                 break;
410         }
411 }
412
413 /*
414  * Assumes @t is zero-initialized.
415  */
416 static void target_init(struct ceph_osd_request_target *t)
417 {
418         ceph_oid_init(&t->base_oid);
419         ceph_oloc_init(&t->base_oloc);
420         ceph_oid_init(&t->target_oid);
421         ceph_oloc_init(&t->target_oloc);
422
423         ceph_osds_init(&t->acting);
424         ceph_osds_init(&t->up);
425         t->size = -1;
426         t->min_size = -1;
427
428         t->osd = CEPH_HOMELESS_OSD;
429 }
430
431 static void target_copy(struct ceph_osd_request_target *dest,
432                         const struct ceph_osd_request_target *src)
433 {
434         ceph_oid_copy(&dest->base_oid, &src->base_oid);
435         ceph_oloc_copy(&dest->base_oloc, &src->base_oloc);
436         ceph_oid_copy(&dest->target_oid, &src->target_oid);
437         ceph_oloc_copy(&dest->target_oloc, &src->target_oloc);
438
439         dest->pgid = src->pgid; /* struct */
440         dest->spgid = src->spgid; /* struct */
441         dest->pg_num = src->pg_num;
442         dest->pg_num_mask = src->pg_num_mask;
443         ceph_osds_copy(&dest->acting, &src->acting);
444         ceph_osds_copy(&dest->up, &src->up);
445         dest->size = src->size;
446         dest->min_size = src->min_size;
447         dest->sort_bitwise = src->sort_bitwise;
448         dest->recovery_deletes = src->recovery_deletes;
449
450         dest->flags = src->flags;
451         dest->used_replica = src->used_replica;
452         dest->paused = src->paused;
453
454         dest->epoch = src->epoch;
455         dest->last_force_resend = src->last_force_resend;
456
457         dest->osd = src->osd;
458 }
459
460 static void target_destroy(struct ceph_osd_request_target *t)
461 {
462         ceph_oid_destroy(&t->base_oid);
463         ceph_oloc_destroy(&t->base_oloc);
464         ceph_oid_destroy(&t->target_oid);
465         ceph_oloc_destroy(&t->target_oloc);
466 }
467
468 /*
469  * requests
470  */
471 static void request_release_checks(struct ceph_osd_request *req)
472 {
473         WARN_ON(!RB_EMPTY_NODE(&req->r_node));
474         WARN_ON(!RB_EMPTY_NODE(&req->r_mc_node));
475         WARN_ON(!list_empty(&req->r_private_item));
476         WARN_ON(req->r_osd);
477 }
478
479 static void ceph_osdc_release_request(struct kref *kref)
480 {
481         struct ceph_osd_request *req = container_of(kref,
482                                             struct ceph_osd_request, r_kref);
483         unsigned int which;
484
485         dout("%s %p (r_request %p r_reply %p)\n", __func__, req,
486              req->r_request, req->r_reply);
487         request_release_checks(req);
488
489         if (req->r_request)
490                 ceph_msg_put(req->r_request);
491         if (req->r_reply)
492                 ceph_msg_put(req->r_reply);
493
494         for (which = 0; which < req->r_num_ops; which++)
495                 osd_req_op_data_release(req, which);
496
497         target_destroy(&req->r_t);
498         ceph_put_snap_context(req->r_snapc);
499
500         if (req->r_mempool)
501                 mempool_free(req, req->r_osdc->req_mempool);
502         else if (req->r_num_ops <= CEPH_OSD_SLAB_OPS)
503                 kmem_cache_free(ceph_osd_request_cache, req);
504         else
505                 kfree(req);
506 }
507
508 void ceph_osdc_get_request(struct ceph_osd_request *req)
509 {
510         dout("%s %p (was %d)\n", __func__, req,
511              kref_read(&req->r_kref));
512         kref_get(&req->r_kref);
513 }
514 EXPORT_SYMBOL(ceph_osdc_get_request);
515
516 void ceph_osdc_put_request(struct ceph_osd_request *req)
517 {
518         if (req) {
519                 dout("%s %p (was %d)\n", __func__, req,
520                      kref_read(&req->r_kref));
521                 kref_put(&req->r_kref, ceph_osdc_release_request);
522         }
523 }
524 EXPORT_SYMBOL(ceph_osdc_put_request);
525
526 static void request_init(struct ceph_osd_request *req)
527 {
528         /* req only, each op is zeroed in osd_req_op_init() */
529         memset(req, 0, sizeof(*req));
530
531         kref_init(&req->r_kref);
532         init_completion(&req->r_completion);
533         RB_CLEAR_NODE(&req->r_node);
534         RB_CLEAR_NODE(&req->r_mc_node);
535         INIT_LIST_HEAD(&req->r_private_item);
536
537         target_init(&req->r_t);
538 }
539
540 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
541                                                struct ceph_snap_context *snapc,
542                                                unsigned int num_ops,
543                                                bool use_mempool,
544                                                gfp_t gfp_flags)
545 {
546         struct ceph_osd_request *req;
547
548         if (use_mempool) {
549                 BUG_ON(num_ops > CEPH_OSD_SLAB_OPS);
550                 req = mempool_alloc(osdc->req_mempool, gfp_flags);
551         } else if (num_ops <= CEPH_OSD_SLAB_OPS) {
552                 req = kmem_cache_alloc(ceph_osd_request_cache, gfp_flags);
553         } else {
554                 BUG_ON(num_ops > CEPH_OSD_MAX_OPS);
555                 req = kmalloc(struct_size(req, r_ops, num_ops), gfp_flags);
556         }
557         if (unlikely(!req))
558                 return NULL;
559
560         request_init(req);
561         req->r_osdc = osdc;
562         req->r_mempool = use_mempool;
563         req->r_num_ops = num_ops;
564         req->r_snapid = CEPH_NOSNAP;
565         req->r_snapc = ceph_get_snap_context(snapc);
566
567         dout("%s req %p\n", __func__, req);
568         return req;
569 }
570 EXPORT_SYMBOL(ceph_osdc_alloc_request);
571
572 static int ceph_oloc_encoding_size(const struct ceph_object_locator *oloc)
573 {
574         return 8 + 4 + 4 + 4 + (oloc->pool_ns ? oloc->pool_ns->len : 0);
575 }
576
577 static int __ceph_osdc_alloc_messages(struct ceph_osd_request *req, gfp_t gfp,
578                                       int num_request_data_items,
579                                       int num_reply_data_items)
580 {
581         struct ceph_osd_client *osdc = req->r_osdc;
582         struct ceph_msg *msg;
583         int msg_size;
584
585         WARN_ON(req->r_request || req->r_reply);
586         WARN_ON(ceph_oid_empty(&req->r_base_oid));
587         WARN_ON(ceph_oloc_empty(&req->r_base_oloc));
588
589         /* create request message */
590         msg_size = CEPH_ENCODING_START_BLK_LEN +
591                         CEPH_PGID_ENCODING_LEN + 1; /* spgid */
592         msg_size += 4 + 4 + 4; /* hash, osdmap_epoch, flags */
593         msg_size += CEPH_ENCODING_START_BLK_LEN +
594                         sizeof(struct ceph_osd_reqid); /* reqid */
595         msg_size += sizeof(struct ceph_blkin_trace_info); /* trace */
596         msg_size += 4 + sizeof(struct ceph_timespec); /* client_inc, mtime */
597         msg_size += CEPH_ENCODING_START_BLK_LEN +
598                         ceph_oloc_encoding_size(&req->r_base_oloc); /* oloc */
599         msg_size += 4 + req->r_base_oid.name_len; /* oid */
600         msg_size += 2 + req->r_num_ops * sizeof(struct ceph_osd_op);
601         msg_size += 8; /* snapid */
602         msg_size += 8; /* snap_seq */
603         msg_size += 4 + 8 * (req->r_snapc ? req->r_snapc->num_snaps : 0);
604         msg_size += 4 + 8; /* retry_attempt, features */
605
606         if (req->r_mempool)
607                 msg = ceph_msgpool_get(&osdc->msgpool_op, msg_size,
608                                        num_request_data_items);
609         else
610                 msg = ceph_msg_new2(CEPH_MSG_OSD_OP, msg_size,
611                                     num_request_data_items, gfp, true);
612         if (!msg)
613                 return -ENOMEM;
614
615         memset(msg->front.iov_base, 0, msg->front.iov_len);
616         req->r_request = msg;
617
618         /* create reply message */
619         msg_size = OSD_OPREPLY_FRONT_LEN;
620         msg_size += req->r_base_oid.name_len;
621         msg_size += req->r_num_ops * sizeof(struct ceph_osd_op);
622
623         if (req->r_mempool)
624                 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, msg_size,
625                                        num_reply_data_items);
626         else
627                 msg = ceph_msg_new2(CEPH_MSG_OSD_OPREPLY, msg_size,
628                                     num_reply_data_items, gfp, true);
629         if (!msg)
630                 return -ENOMEM;
631
632         req->r_reply = msg;
633
634         return 0;
635 }
636
637 static bool osd_req_opcode_valid(u16 opcode)
638 {
639         switch (opcode) {
640 #define GENERATE_CASE(op, opcode, str)  case CEPH_OSD_OP_##op: return true;
641 __CEPH_FORALL_OSD_OPS(GENERATE_CASE)
642 #undef GENERATE_CASE
643         default:
644                 return false;
645         }
646 }
647
648 static void get_num_data_items(struct ceph_osd_request *req,
649                                int *num_request_data_items,
650                                int *num_reply_data_items)
651 {
652         struct ceph_osd_req_op *op;
653
654         *num_request_data_items = 0;
655         *num_reply_data_items = 0;
656
657         for (op = req->r_ops; op != &req->r_ops[req->r_num_ops]; op++) {
658                 switch (op->op) {
659                 /* request */
660                 case CEPH_OSD_OP_WRITE:
661                 case CEPH_OSD_OP_WRITEFULL:
662                 case CEPH_OSD_OP_SETXATTR:
663                 case CEPH_OSD_OP_CMPXATTR:
664                 case CEPH_OSD_OP_NOTIFY_ACK:
665                 case CEPH_OSD_OP_COPY_FROM2:
666                         *num_request_data_items += 1;
667                         break;
668
669                 /* reply */
670                 case CEPH_OSD_OP_STAT:
671                 case CEPH_OSD_OP_READ:
672                 case CEPH_OSD_OP_LIST_WATCHERS:
673                         *num_reply_data_items += 1;
674                         break;
675
676                 /* both */
677                 case CEPH_OSD_OP_NOTIFY:
678                         *num_request_data_items += 1;
679                         *num_reply_data_items += 1;
680                         break;
681                 case CEPH_OSD_OP_CALL:
682                         *num_request_data_items += 2;
683                         *num_reply_data_items += 1;
684                         break;
685
686                 default:
687                         WARN_ON(!osd_req_opcode_valid(op->op));
688                         break;
689                 }
690         }
691 }
692
693 /*
694  * oid, oloc and OSD op opcode(s) must be filled in before this function
695  * is called.
696  */
697 int ceph_osdc_alloc_messages(struct ceph_osd_request *req, gfp_t gfp)
698 {
699         int num_request_data_items, num_reply_data_items;
700
701         get_num_data_items(req, &num_request_data_items, &num_reply_data_items);
702         return __ceph_osdc_alloc_messages(req, gfp, num_request_data_items,
703                                           num_reply_data_items);
704 }
705 EXPORT_SYMBOL(ceph_osdc_alloc_messages);
706
707 /*
708  * This is an osd op init function for opcodes that have no data or
709  * other information associated with them.  It also serves as a
710  * common init routine for all the other init functions, below.
711  */
712 struct ceph_osd_req_op *
713 osd_req_op_init(struct ceph_osd_request *osd_req, unsigned int which,
714                  u16 opcode, u32 flags)
715 {
716         struct ceph_osd_req_op *op;
717
718         BUG_ON(which >= osd_req->r_num_ops);
719         BUG_ON(!osd_req_opcode_valid(opcode));
720
721         op = &osd_req->r_ops[which];
722         memset(op, 0, sizeof (*op));
723         op->op = opcode;
724         op->flags = flags;
725
726         return op;
727 }
728 EXPORT_SYMBOL(osd_req_op_init);
729
730 void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
731                                 unsigned int which, u16 opcode,
732                                 u64 offset, u64 length,
733                                 u64 truncate_size, u32 truncate_seq)
734 {
735         struct ceph_osd_req_op *op = osd_req_op_init(osd_req, which,
736                                                      opcode, 0);
737         size_t payload_len = 0;
738
739         BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
740                opcode != CEPH_OSD_OP_WRITEFULL && opcode != CEPH_OSD_OP_ZERO &&
741                opcode != CEPH_OSD_OP_TRUNCATE);
742
743         op->extent.offset = offset;
744         op->extent.length = length;
745         op->extent.truncate_size = truncate_size;
746         op->extent.truncate_seq = truncate_seq;
747         if (opcode == CEPH_OSD_OP_WRITE || opcode == CEPH_OSD_OP_WRITEFULL)
748                 payload_len += length;
749
750         op->indata_len = payload_len;
751 }
752 EXPORT_SYMBOL(osd_req_op_extent_init);
753
754 void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
755                                 unsigned int which, u64 length)
756 {
757         struct ceph_osd_req_op *op;
758         u64 previous;
759
760         BUG_ON(which >= osd_req->r_num_ops);
761         op = &osd_req->r_ops[which];
762         previous = op->extent.length;
763
764         if (length == previous)
765                 return;         /* Nothing to do */
766         BUG_ON(length > previous);
767
768         op->extent.length = length;
769         if (op->op == CEPH_OSD_OP_WRITE || op->op == CEPH_OSD_OP_WRITEFULL)
770                 op->indata_len -= previous - length;
771 }
772 EXPORT_SYMBOL(osd_req_op_extent_update);
773
774 void osd_req_op_extent_dup_last(struct ceph_osd_request *osd_req,
775                                 unsigned int which, u64 offset_inc)
776 {
777         struct ceph_osd_req_op *op, *prev_op;
778
779         BUG_ON(which + 1 >= osd_req->r_num_ops);
780
781         prev_op = &osd_req->r_ops[which];
782         op = osd_req_op_init(osd_req, which + 1, prev_op->op, prev_op->flags);
783         /* dup previous one */
784         op->indata_len = prev_op->indata_len;
785         op->outdata_len = prev_op->outdata_len;
786         op->extent = prev_op->extent;
787         /* adjust offset */
788         op->extent.offset += offset_inc;
789         op->extent.length -= offset_inc;
790
791         if (op->op == CEPH_OSD_OP_WRITE || op->op == CEPH_OSD_OP_WRITEFULL)
792                 op->indata_len -= offset_inc;
793 }
794 EXPORT_SYMBOL(osd_req_op_extent_dup_last);
795
796 int osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which,
797                         const char *class, const char *method)
798 {
799         struct ceph_osd_req_op *op;
800         struct ceph_pagelist *pagelist;
801         size_t payload_len = 0;
802         size_t size;
803         int ret;
804
805         op = osd_req_op_init(osd_req, which, CEPH_OSD_OP_CALL, 0);
806
807         pagelist = ceph_pagelist_alloc(GFP_NOFS);
808         if (!pagelist)
809                 return -ENOMEM;
810
811         op->cls.class_name = class;
812         size = strlen(class);
813         BUG_ON(size > (size_t) U8_MAX);
814         op->cls.class_len = size;
815         ret = ceph_pagelist_append(pagelist, class, size);
816         if (ret)
817                 goto err_pagelist_free;
818         payload_len += size;
819
820         op->cls.method_name = method;
821         size = strlen(method);
822         BUG_ON(size > (size_t) U8_MAX);
823         op->cls.method_len = size;
824         ret = ceph_pagelist_append(pagelist, method, size);
825         if (ret)
826                 goto err_pagelist_free;
827         payload_len += size;
828
829         osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist);
830         op->indata_len = payload_len;
831         return 0;
832
833 err_pagelist_free:
834         ceph_pagelist_release(pagelist);
835         return ret;
836 }
837 EXPORT_SYMBOL(osd_req_op_cls_init);
838
839 int osd_req_op_xattr_init(struct ceph_osd_request *osd_req, unsigned int which,
840                           u16 opcode, const char *name, const void *value,
841                           size_t size, u8 cmp_op, u8 cmp_mode)
842 {
843         struct ceph_osd_req_op *op = osd_req_op_init(osd_req, which,
844                                                      opcode, 0);
845         struct ceph_pagelist *pagelist;
846         size_t payload_len;
847         int ret;
848
849         BUG_ON(opcode != CEPH_OSD_OP_SETXATTR && opcode != CEPH_OSD_OP_CMPXATTR);
850
851         pagelist = ceph_pagelist_alloc(GFP_NOFS);
852         if (!pagelist)
853                 return -ENOMEM;
854
855         payload_len = strlen(name);
856         op->xattr.name_len = payload_len;
857         ret = ceph_pagelist_append(pagelist, name, payload_len);
858         if (ret)
859                 goto err_pagelist_free;
860
861         op->xattr.value_len = size;
862         ret = ceph_pagelist_append(pagelist, value, size);
863         if (ret)
864                 goto err_pagelist_free;
865         payload_len += size;
866
867         op->xattr.cmp_op = cmp_op;
868         op->xattr.cmp_mode = cmp_mode;
869
870         ceph_osd_data_pagelist_init(&op->xattr.osd_data, pagelist);
871         op->indata_len = payload_len;
872         return 0;
873
874 err_pagelist_free:
875         ceph_pagelist_release(pagelist);
876         return ret;
877 }
878 EXPORT_SYMBOL(osd_req_op_xattr_init);
879
880 /*
881  * @watch_opcode: CEPH_OSD_WATCH_OP_*
882  */
883 static void osd_req_op_watch_init(struct ceph_osd_request *req, int which,
884                                   u8 watch_opcode, u64 cookie, u32 gen)
885 {
886         struct ceph_osd_req_op *op;
887
888         op = osd_req_op_init(req, which, CEPH_OSD_OP_WATCH, 0);
889         op->watch.cookie = cookie;
890         op->watch.op = watch_opcode;
891         op->watch.gen = gen;
892 }
893
894 /*
895  * prot_ver, timeout and notify payload (may be empty) should already be
896  * encoded in @request_pl
897  */
898 static void osd_req_op_notify_init(struct ceph_osd_request *req, int which,
899                                    u64 cookie, struct ceph_pagelist *request_pl)
900 {
901         struct ceph_osd_req_op *op;
902
903         op = osd_req_op_init(req, which, CEPH_OSD_OP_NOTIFY, 0);
904         op->notify.cookie = cookie;
905
906         ceph_osd_data_pagelist_init(&op->notify.request_data, request_pl);
907         op->indata_len = request_pl->length;
908 }
909
910 /*
911  * @flags: CEPH_OSD_OP_ALLOC_HINT_FLAG_*
912  */
913 void osd_req_op_alloc_hint_init(struct ceph_osd_request *osd_req,
914                                 unsigned int which,
915                                 u64 expected_object_size,
916                                 u64 expected_write_size,
917                                 u32 flags)
918 {
919         struct ceph_osd_req_op *op;
920
921         op = osd_req_op_init(osd_req, which, CEPH_OSD_OP_SETALLOCHINT, 0);
922         op->alloc_hint.expected_object_size = expected_object_size;
923         op->alloc_hint.expected_write_size = expected_write_size;
924         op->alloc_hint.flags = flags;
925
926         /*
927          * CEPH_OSD_OP_SETALLOCHINT op is advisory and therefore deemed
928          * not worth a feature bit.  Set FAILOK per-op flag to make
929          * sure older osds don't trip over an unsupported opcode.
930          */
931         op->flags |= CEPH_OSD_OP_FLAG_FAILOK;
932 }
933 EXPORT_SYMBOL(osd_req_op_alloc_hint_init);
934
935 static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
936                                 struct ceph_osd_data *osd_data)
937 {
938         u64 length = ceph_osd_data_length(osd_data);
939
940         if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
941                 BUG_ON(length > (u64) SIZE_MAX);
942                 if (length)
943                         ceph_msg_data_add_pages(msg, osd_data->pages,
944                                         length, osd_data->alignment, false);
945         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
946                 BUG_ON(!length);
947                 ceph_msg_data_add_pagelist(msg, osd_data->pagelist);
948 #ifdef CONFIG_BLOCK
949         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
950                 ceph_msg_data_add_bio(msg, &osd_data->bio_pos, length);
951 #endif
952         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_BVECS) {
953                 ceph_msg_data_add_bvecs(msg, &osd_data->bvec_pos);
954         } else {
955                 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
956         }
957 }
958
959 static u32 osd_req_encode_op(struct ceph_osd_op *dst,
960                              const struct ceph_osd_req_op *src)
961 {
962         switch (src->op) {
963         case CEPH_OSD_OP_STAT:
964                 break;
965         case CEPH_OSD_OP_READ:
966         case CEPH_OSD_OP_WRITE:
967         case CEPH_OSD_OP_WRITEFULL:
968         case CEPH_OSD_OP_ZERO:
969         case CEPH_OSD_OP_TRUNCATE:
970                 dst->extent.offset = cpu_to_le64(src->extent.offset);
971                 dst->extent.length = cpu_to_le64(src->extent.length);
972                 dst->extent.truncate_size =
973                         cpu_to_le64(src->extent.truncate_size);
974                 dst->extent.truncate_seq =
975                         cpu_to_le32(src->extent.truncate_seq);
976                 break;
977         case CEPH_OSD_OP_CALL:
978                 dst->cls.class_len = src->cls.class_len;
979                 dst->cls.method_len = src->cls.method_len;
980                 dst->cls.indata_len = cpu_to_le32(src->cls.indata_len);
981                 break;
982         case CEPH_OSD_OP_WATCH:
983                 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
984                 dst->watch.ver = cpu_to_le64(0);
985                 dst->watch.op = src->watch.op;
986                 dst->watch.gen = cpu_to_le32(src->watch.gen);
987                 break;
988         case CEPH_OSD_OP_NOTIFY_ACK:
989                 break;
990         case CEPH_OSD_OP_NOTIFY:
991                 dst->notify.cookie = cpu_to_le64(src->notify.cookie);
992                 break;
993         case CEPH_OSD_OP_LIST_WATCHERS:
994                 break;
995         case CEPH_OSD_OP_SETALLOCHINT:
996                 dst->alloc_hint.expected_object_size =
997                     cpu_to_le64(src->alloc_hint.expected_object_size);
998                 dst->alloc_hint.expected_write_size =
999                     cpu_to_le64(src->alloc_hint.expected_write_size);
1000                 dst->alloc_hint.flags = cpu_to_le32(src->alloc_hint.flags);
1001                 break;
1002         case CEPH_OSD_OP_SETXATTR:
1003         case CEPH_OSD_OP_CMPXATTR:
1004                 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
1005                 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
1006                 dst->xattr.cmp_op = src->xattr.cmp_op;
1007                 dst->xattr.cmp_mode = src->xattr.cmp_mode;
1008                 break;
1009         case CEPH_OSD_OP_CREATE:
1010         case CEPH_OSD_OP_DELETE:
1011                 break;
1012         case CEPH_OSD_OP_COPY_FROM2:
1013                 dst->copy_from.snapid = cpu_to_le64(src->copy_from.snapid);
1014                 dst->copy_from.src_version =
1015                         cpu_to_le64(src->copy_from.src_version);
1016                 dst->copy_from.flags = src->copy_from.flags;
1017                 dst->copy_from.src_fadvise_flags =
1018                         cpu_to_le32(src->copy_from.src_fadvise_flags);
1019                 break;
1020         default:
1021                 pr_err("unsupported osd opcode %s\n",
1022                         ceph_osd_op_name(src->op));
1023                 WARN_ON(1);
1024
1025                 return 0;
1026         }
1027
1028         dst->op = cpu_to_le16(src->op);
1029         dst->flags = cpu_to_le32(src->flags);
1030         dst->payload_len = cpu_to_le32(src->indata_len);
1031
1032         return src->indata_len;
1033 }
1034
1035 /*
1036  * build new request AND message, calculate layout, and adjust file
1037  * extent as needed.
1038  *
1039  * if the file was recently truncated, we include information about its
1040  * old and new size so that the object can be updated appropriately.  (we
1041  * avoid synchronously deleting truncated objects because it's slow.)
1042  */
1043 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
1044                                                struct ceph_file_layout *layout,
1045                                                struct ceph_vino vino,
1046                                                u64 off, u64 *plen,
1047                                                unsigned int which, int num_ops,
1048                                                int opcode, int flags,
1049                                                struct ceph_snap_context *snapc,
1050                                                u32 truncate_seq,
1051                                                u64 truncate_size,
1052                                                bool use_mempool)
1053 {
1054         struct ceph_osd_request *req;
1055         u64 objnum = 0;
1056         u64 objoff = 0;
1057         u64 objlen = 0;
1058         int r;
1059
1060         BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
1061                opcode != CEPH_OSD_OP_ZERO && opcode != CEPH_OSD_OP_TRUNCATE &&
1062                opcode != CEPH_OSD_OP_CREATE && opcode != CEPH_OSD_OP_DELETE);
1063
1064         req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
1065                                         GFP_NOFS);
1066         if (!req) {
1067                 r = -ENOMEM;
1068                 goto fail;
1069         }
1070
1071         /* calculate max write size */
1072         r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
1073         if (r)
1074                 goto fail;
1075
1076         if (opcode == CEPH_OSD_OP_CREATE || opcode == CEPH_OSD_OP_DELETE) {
1077                 osd_req_op_init(req, which, opcode, 0);
1078         } else {
1079                 u32 object_size = layout->object_size;
1080                 u32 object_base = off - objoff;
1081                 if (!(truncate_seq == 1 && truncate_size == -1ULL)) {
1082                         if (truncate_size <= object_base) {
1083                                 truncate_size = 0;
1084                         } else {
1085                                 truncate_size -= object_base;
1086                                 if (truncate_size > object_size)
1087                                         truncate_size = object_size;
1088                         }
1089                 }
1090                 osd_req_op_extent_init(req, which, opcode, objoff, objlen,
1091                                        truncate_size, truncate_seq);
1092         }
1093
1094         req->r_base_oloc.pool = layout->pool_id;
1095         req->r_base_oloc.pool_ns = ceph_try_get_string(layout->pool_ns);
1096         ceph_oid_printf(&req->r_base_oid, "%llx.%08llx", vino.ino, objnum);
1097         req->r_flags = flags | osdc->client->options->read_from_replica;
1098
1099         req->r_snapid = vino.snap;
1100         if (flags & CEPH_OSD_FLAG_WRITE)
1101                 req->r_data_offset = off;
1102
1103         if (num_ops > 1)
1104                 /*
1105                  * This is a special case for ceph_writepages_start(), but it
1106                  * also covers ceph_uninline_data().  If more multi-op request
1107                  * use cases emerge, we will need a separate helper.
1108                  */
1109                 r = __ceph_osdc_alloc_messages(req, GFP_NOFS, num_ops, 0);
1110         else
1111                 r = ceph_osdc_alloc_messages(req, GFP_NOFS);
1112         if (r)
1113                 goto fail;
1114
1115         return req;
1116
1117 fail:
1118         ceph_osdc_put_request(req);
1119         return ERR_PTR(r);
1120 }
1121 EXPORT_SYMBOL(ceph_osdc_new_request);
1122
1123 /*
1124  * We keep osd requests in an rbtree, sorted by ->r_tid.
1125  */
1126 DEFINE_RB_FUNCS(request, struct ceph_osd_request, r_tid, r_node)
1127 DEFINE_RB_FUNCS(request_mc, struct ceph_osd_request, r_tid, r_mc_node)
1128
1129 /*
1130  * Call @fn on each OSD request as long as @fn returns 0.
1131  */
1132 static void for_each_request(struct ceph_osd_client *osdc,
1133                         int (*fn)(struct ceph_osd_request *req, void *arg),
1134                         void *arg)
1135 {
1136         struct rb_node *n, *p;
1137
1138         for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
1139                 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
1140
1141                 for (p = rb_first(&osd->o_requests); p; ) {
1142                         struct ceph_osd_request *req =
1143                             rb_entry(p, struct ceph_osd_request, r_node);
1144
1145                         p = rb_next(p);
1146                         if (fn(req, arg))
1147                                 return;
1148                 }
1149         }
1150
1151         for (p = rb_first(&osdc->homeless_osd.o_requests); p; ) {
1152                 struct ceph_osd_request *req =
1153                     rb_entry(p, struct ceph_osd_request, r_node);
1154
1155                 p = rb_next(p);
1156                 if (fn(req, arg))
1157                         return;
1158         }
1159 }
1160
1161 static bool osd_homeless(struct ceph_osd *osd)
1162 {
1163         return osd->o_osd == CEPH_HOMELESS_OSD;
1164 }
1165
1166 static bool osd_registered(struct ceph_osd *osd)
1167 {
1168         verify_osdc_locked(osd->o_osdc);
1169
1170         return !RB_EMPTY_NODE(&osd->o_node);
1171 }
1172
1173 /*
1174  * Assumes @osd is zero-initialized.
1175  */
1176 static void osd_init(struct ceph_osd *osd)
1177 {
1178         refcount_set(&osd->o_ref, 1);
1179         RB_CLEAR_NODE(&osd->o_node);
1180         osd->o_requests = RB_ROOT;
1181         osd->o_linger_requests = RB_ROOT;
1182         osd->o_backoff_mappings = RB_ROOT;
1183         osd->o_backoffs_by_id = RB_ROOT;
1184         INIT_LIST_HEAD(&osd->o_osd_lru);
1185         INIT_LIST_HEAD(&osd->o_keepalive_item);
1186         osd->o_incarnation = 1;
1187         mutex_init(&osd->lock);
1188 }
1189
1190 static void osd_cleanup(struct ceph_osd *osd)
1191 {
1192         WARN_ON(!RB_EMPTY_NODE(&osd->o_node));
1193         WARN_ON(!RB_EMPTY_ROOT(&osd->o_requests));
1194         WARN_ON(!RB_EMPTY_ROOT(&osd->o_linger_requests));
1195         WARN_ON(!RB_EMPTY_ROOT(&osd->o_backoff_mappings));
1196         WARN_ON(!RB_EMPTY_ROOT(&osd->o_backoffs_by_id));
1197         WARN_ON(!list_empty(&osd->o_osd_lru));
1198         WARN_ON(!list_empty(&osd->o_keepalive_item));
1199
1200         if (osd->o_auth.authorizer) {
1201                 WARN_ON(osd_homeless(osd));
1202                 ceph_auth_destroy_authorizer(osd->o_auth.authorizer);
1203         }
1204 }
1205
1206 /*
1207  * Track open sessions with osds.
1208  */
1209 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
1210 {
1211         struct ceph_osd *osd;
1212
1213         WARN_ON(onum == CEPH_HOMELESS_OSD);
1214
1215         osd = kzalloc(sizeof(*osd), GFP_NOIO | __GFP_NOFAIL);
1216         osd_init(osd);
1217         osd->o_osdc = osdc;
1218         osd->o_osd = onum;
1219
1220         ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
1221
1222         return osd;
1223 }
1224
1225 static struct ceph_osd *get_osd(struct ceph_osd *osd)
1226 {
1227         if (refcount_inc_not_zero(&osd->o_ref)) {
1228                 dout("get_osd %p %d -> %d\n", osd, refcount_read(&osd->o_ref)-1,
1229                      refcount_read(&osd->o_ref));
1230                 return osd;
1231         } else {
1232                 dout("get_osd %p FAIL\n", osd);
1233                 return NULL;
1234         }
1235 }
1236
1237 static void put_osd(struct ceph_osd *osd)
1238 {
1239         dout("put_osd %p %d -> %d\n", osd, refcount_read(&osd->o_ref),
1240              refcount_read(&osd->o_ref) - 1);
1241         if (refcount_dec_and_test(&osd->o_ref)) {
1242                 osd_cleanup(osd);
1243                 kfree(osd);
1244         }
1245 }
1246
1247 DEFINE_RB_FUNCS(osd, struct ceph_osd, o_osd, o_node)
1248
1249 static void __move_osd_to_lru(struct ceph_osd *osd)
1250 {
1251         struct ceph_osd_client *osdc = osd->o_osdc;
1252
1253         dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
1254         BUG_ON(!list_empty(&osd->o_osd_lru));
1255
1256         spin_lock(&osdc->osd_lru_lock);
1257         list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
1258         spin_unlock(&osdc->osd_lru_lock);
1259
1260         osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl;
1261 }
1262
1263 static void maybe_move_osd_to_lru(struct ceph_osd *osd)
1264 {
1265         if (RB_EMPTY_ROOT(&osd->o_requests) &&
1266             RB_EMPTY_ROOT(&osd->o_linger_requests))
1267                 __move_osd_to_lru(osd);
1268 }
1269
1270 static void __remove_osd_from_lru(struct ceph_osd *osd)
1271 {
1272         struct ceph_osd_client *osdc = osd->o_osdc;
1273
1274         dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
1275
1276         spin_lock(&osdc->osd_lru_lock);
1277         if (!list_empty(&osd->o_osd_lru))
1278                 list_del_init(&osd->o_osd_lru);
1279         spin_unlock(&osdc->osd_lru_lock);
1280 }
1281
1282 /*
1283  * Close the connection and assign any leftover requests to the
1284  * homeless session.
1285  */
1286 static void close_osd(struct ceph_osd *osd)
1287 {
1288         struct ceph_osd_client *osdc = osd->o_osdc;
1289         struct rb_node *n;
1290
1291         verify_osdc_wrlocked(osdc);
1292         dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
1293
1294         ceph_con_close(&osd->o_con);
1295
1296         for (n = rb_first(&osd->o_requests); n; ) {
1297                 struct ceph_osd_request *req =
1298                     rb_entry(n, struct ceph_osd_request, r_node);
1299
1300                 n = rb_next(n); /* unlink_request() */
1301
1302                 dout(" reassigning req %p tid %llu\n", req, req->r_tid);
1303                 unlink_request(osd, req);
1304                 link_request(&osdc->homeless_osd, req);
1305         }
1306         for (n = rb_first(&osd->o_linger_requests); n; ) {
1307                 struct ceph_osd_linger_request *lreq =
1308                     rb_entry(n, struct ceph_osd_linger_request, node);
1309
1310                 n = rb_next(n); /* unlink_linger() */
1311
1312                 dout(" reassigning lreq %p linger_id %llu\n", lreq,
1313                      lreq->linger_id);
1314                 unlink_linger(osd, lreq);
1315                 link_linger(&osdc->homeless_osd, lreq);
1316         }
1317         clear_backoffs(osd);
1318
1319         __remove_osd_from_lru(osd);
1320         erase_osd(&osdc->osds, osd);
1321         put_osd(osd);
1322 }
1323
1324 /*
1325  * reset osd connect
1326  */
1327 static int reopen_osd(struct ceph_osd *osd)
1328 {
1329         struct ceph_entity_addr *peer_addr;
1330
1331         dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
1332
1333         if (RB_EMPTY_ROOT(&osd->o_requests) &&
1334             RB_EMPTY_ROOT(&osd->o_linger_requests)) {
1335                 close_osd(osd);
1336                 return -ENODEV;
1337         }
1338
1339         peer_addr = &osd->o_osdc->osdmap->osd_addr[osd->o_osd];
1340         if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
1341                         !ceph_con_opened(&osd->o_con)) {
1342                 struct rb_node *n;
1343
1344                 dout("osd addr hasn't changed and connection never opened, "
1345                      "letting msgr retry\n");
1346                 /* touch each r_stamp for handle_timeout()'s benfit */
1347                 for (n = rb_first(&osd->o_requests); n; n = rb_next(n)) {
1348                         struct ceph_osd_request *req =
1349                             rb_entry(n, struct ceph_osd_request, r_node);
1350                         req->r_stamp = jiffies;
1351                 }
1352
1353                 return -EAGAIN;
1354         }
1355
1356         ceph_con_close(&osd->o_con);
1357         ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
1358         osd->o_incarnation++;
1359
1360         return 0;
1361 }
1362
1363 static struct ceph_osd *lookup_create_osd(struct ceph_osd_client *osdc, int o,
1364                                           bool wrlocked)
1365 {
1366         struct ceph_osd *osd;
1367
1368         if (wrlocked)
1369                 verify_osdc_wrlocked(osdc);
1370         else
1371                 verify_osdc_locked(osdc);
1372
1373         if (o != CEPH_HOMELESS_OSD)
1374                 osd = lookup_osd(&osdc->osds, o);
1375         else
1376                 osd = &osdc->homeless_osd;
1377         if (!osd) {
1378                 if (!wrlocked)
1379                         return ERR_PTR(-EAGAIN);
1380
1381                 osd = create_osd(osdc, o);
1382                 insert_osd(&osdc->osds, osd);
1383                 ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd,
1384                               &osdc->osdmap->osd_addr[osd->o_osd]);
1385         }
1386
1387         dout("%s osdc %p osd%d -> osd %p\n", __func__, osdc, o, osd);
1388         return osd;
1389 }
1390
1391 /*
1392  * Create request <-> OSD session relation.
1393  *
1394  * @req has to be assigned a tid, @osd may be homeless.
1395  */
1396 static void link_request(struct ceph_osd *osd, struct ceph_osd_request *req)
1397 {
1398         verify_osd_locked(osd);
1399         WARN_ON(!req->r_tid || req->r_osd);
1400         dout("%s osd %p osd%d req %p tid %llu\n", __func__, osd, osd->o_osd,
1401              req, req->r_tid);
1402
1403         if (!osd_homeless(osd))
1404                 __remove_osd_from_lru(osd);
1405         else
1406                 atomic_inc(&osd->o_osdc->num_homeless);
1407
1408         get_osd(osd);
1409         insert_request(&osd->o_requests, req);
1410         req->r_osd = osd;
1411 }
1412
1413 static void unlink_request(struct ceph_osd *osd, struct ceph_osd_request *req)
1414 {
1415         verify_osd_locked(osd);
1416         WARN_ON(req->r_osd != osd);
1417         dout("%s osd %p osd%d req %p tid %llu\n", __func__, osd, osd->o_osd,
1418              req, req->r_tid);
1419
1420         req->r_osd = NULL;
1421         erase_request(&osd->o_requests, req);
1422         put_osd(osd);
1423
1424         if (!osd_homeless(osd))
1425                 maybe_move_osd_to_lru(osd);
1426         else
1427                 atomic_dec(&osd->o_osdc->num_homeless);
1428 }
1429
1430 static bool __pool_full(struct ceph_pg_pool_info *pi)
1431 {
1432         return pi->flags & CEPH_POOL_FLAG_FULL;
1433 }
1434
1435 static bool have_pool_full(struct ceph_osd_client *osdc)
1436 {
1437         struct rb_node *n;
1438
1439         for (n = rb_first(&osdc->osdmap->pg_pools); n; n = rb_next(n)) {
1440                 struct ceph_pg_pool_info *pi =
1441                     rb_entry(n, struct ceph_pg_pool_info, node);
1442
1443                 if (__pool_full(pi))
1444                         return true;
1445         }
1446
1447         return false;
1448 }
1449
1450 static bool pool_full(struct ceph_osd_client *osdc, s64 pool_id)
1451 {
1452         struct ceph_pg_pool_info *pi;
1453
1454         pi = ceph_pg_pool_by_id(osdc->osdmap, pool_id);
1455         if (!pi)
1456                 return false;
1457
1458         return __pool_full(pi);
1459 }
1460
1461 /*
1462  * Returns whether a request should be blocked from being sent
1463  * based on the current osdmap and osd_client settings.
1464  */
1465 static bool target_should_be_paused(struct ceph_osd_client *osdc,
1466                                     const struct ceph_osd_request_target *t,
1467                                     struct ceph_pg_pool_info *pi)
1468 {
1469         bool pauserd = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD);
1470         bool pausewr = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR) ||
1471                        ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
1472                        __pool_full(pi);
1473
1474         WARN_ON(pi->id != t->target_oloc.pool);
1475         return ((t->flags & CEPH_OSD_FLAG_READ) && pauserd) ||
1476                ((t->flags & CEPH_OSD_FLAG_WRITE) && pausewr) ||
1477                (osdc->osdmap->epoch < osdc->epoch_barrier);
1478 }
1479
1480 static int pick_random_replica(const struct ceph_osds *acting)
1481 {
1482         int i = prandom_u32_max(acting->size);
1483
1484         dout("%s picked osd%d, primary osd%d\n", __func__,
1485              acting->osds[i], acting->primary);
1486         return i;
1487 }
1488
1489 /*
1490  * Picks the closest replica based on client's location given by
1491  * crush_location option.  Prefers the primary if the locality is
1492  * the same.
1493  */
1494 static int pick_closest_replica(struct ceph_osd_client *osdc,
1495                                 const struct ceph_osds *acting)
1496 {
1497         struct ceph_options *opt = osdc->client->options;
1498         int best_i, best_locality;
1499         int i = 0, locality;
1500
1501         do {
1502                 locality = ceph_get_crush_locality(osdc->osdmap,
1503                                                    acting->osds[i],
1504                                                    &opt->crush_locs);
1505                 if (i == 0 ||
1506                     (locality >= 0 && best_locality < 0) ||
1507                     (locality >= 0 && best_locality >= 0 &&
1508                      locality < best_locality)) {
1509                         best_i = i;
1510                         best_locality = locality;
1511                 }
1512         } while (++i < acting->size);
1513
1514         dout("%s picked osd%d with locality %d, primary osd%d\n", __func__,
1515              acting->osds[best_i], best_locality, acting->primary);
1516         return best_i;
1517 }
1518
1519 enum calc_target_result {
1520         CALC_TARGET_NO_ACTION = 0,
1521         CALC_TARGET_NEED_RESEND,
1522         CALC_TARGET_POOL_DNE,
1523 };
1524
1525 static enum calc_target_result calc_target(struct ceph_osd_client *osdc,
1526                                            struct ceph_osd_request_target *t,
1527                                            bool any_change)
1528 {
1529         struct ceph_pg_pool_info *pi;
1530         struct ceph_pg pgid, last_pgid;
1531         struct ceph_osds up, acting;
1532         bool is_read = t->flags & CEPH_OSD_FLAG_READ;
1533         bool is_write = t->flags & CEPH_OSD_FLAG_WRITE;
1534         bool force_resend = false;
1535         bool unpaused = false;
1536         bool legacy_change = false;
1537         bool split = false;
1538         bool sort_bitwise = ceph_osdmap_flag(osdc, CEPH_OSDMAP_SORTBITWISE);
1539         bool recovery_deletes = ceph_osdmap_flag(osdc,
1540                                                  CEPH_OSDMAP_RECOVERY_DELETES);
1541         enum calc_target_result ct_res;
1542
1543         t->epoch = osdc->osdmap->epoch;
1544         pi = ceph_pg_pool_by_id(osdc->osdmap, t->base_oloc.pool);
1545         if (!pi) {
1546                 t->osd = CEPH_HOMELESS_OSD;
1547                 ct_res = CALC_TARGET_POOL_DNE;
1548                 goto out;
1549         }
1550
1551         if (osdc->osdmap->epoch == pi->last_force_request_resend) {
1552                 if (t->last_force_resend < pi->last_force_request_resend) {
1553                         t->last_force_resend = pi->last_force_request_resend;
1554                         force_resend = true;
1555                 } else if (t->last_force_resend == 0) {
1556                         force_resend = true;
1557                 }
1558         }
1559
1560         /* apply tiering */
1561         ceph_oid_copy(&t->target_oid, &t->base_oid);
1562         ceph_oloc_copy(&t->target_oloc, &t->base_oloc);
1563         if ((t->flags & CEPH_OSD_FLAG_IGNORE_OVERLAY) == 0) {
1564                 if (is_read && pi->read_tier >= 0)
1565                         t->target_oloc.pool = pi->read_tier;
1566                 if (is_write && pi->write_tier >= 0)
1567                         t->target_oloc.pool = pi->write_tier;
1568
1569                 pi = ceph_pg_pool_by_id(osdc->osdmap, t->target_oloc.pool);
1570                 if (!pi) {
1571                         t->osd = CEPH_HOMELESS_OSD;
1572                         ct_res = CALC_TARGET_POOL_DNE;
1573                         goto out;
1574                 }
1575         }
1576
1577         __ceph_object_locator_to_pg(pi, &t->target_oid, &t->target_oloc, &pgid);
1578         last_pgid.pool = pgid.pool;
1579         last_pgid.seed = ceph_stable_mod(pgid.seed, t->pg_num, t->pg_num_mask);
1580
1581         ceph_pg_to_up_acting_osds(osdc->osdmap, pi, &pgid, &up, &acting);
1582         if (any_change &&
1583             ceph_is_new_interval(&t->acting,
1584                                  &acting,
1585                                  &t->up,
1586                                  &up,
1587                                  t->size,
1588                                  pi->size,
1589                                  t->min_size,
1590                                  pi->min_size,
1591                                  t->pg_num,
1592                                  pi->pg_num,
1593                                  t->sort_bitwise,
1594                                  sort_bitwise,
1595                                  t->recovery_deletes,
1596                                  recovery_deletes,
1597                                  &last_pgid))
1598                 force_resend = true;
1599
1600         if (t->paused && !target_should_be_paused(osdc, t, pi)) {
1601                 t->paused = false;
1602                 unpaused = true;
1603         }
1604         legacy_change = ceph_pg_compare(&t->pgid, &pgid) ||
1605                         ceph_osds_changed(&t->acting, &acting,
1606                                           t->used_replica || any_change);
1607         if (t->pg_num)
1608                 split = ceph_pg_is_split(&last_pgid, t->pg_num, pi->pg_num);
1609
1610         if (legacy_change || force_resend || split) {
1611                 t->pgid = pgid; /* struct */
1612                 ceph_pg_to_primary_shard(osdc->osdmap, pi, &pgid, &t->spgid);
1613                 ceph_osds_copy(&t->acting, &acting);
1614                 ceph_osds_copy(&t->up, &up);
1615                 t->size = pi->size;
1616                 t->min_size = pi->min_size;
1617                 t->pg_num = pi->pg_num;
1618                 t->pg_num_mask = pi->pg_num_mask;
1619                 t->sort_bitwise = sort_bitwise;
1620                 t->recovery_deletes = recovery_deletes;
1621
1622                 if ((t->flags & (CEPH_OSD_FLAG_BALANCE_READS |
1623                                  CEPH_OSD_FLAG_LOCALIZE_READS)) &&
1624                     !is_write && pi->type == CEPH_POOL_TYPE_REP &&
1625                     acting.size > 1) {
1626                         int pos;
1627
1628                         WARN_ON(!is_read || acting.osds[0] != acting.primary);
1629                         if (t->flags & CEPH_OSD_FLAG_BALANCE_READS) {
1630                                 pos = pick_random_replica(&acting);
1631                         } else {
1632                                 pos = pick_closest_replica(osdc, &acting);
1633                         }
1634                         t->osd = acting.osds[pos];
1635                         t->used_replica = pos > 0;
1636                 } else {
1637                         t->osd = acting.primary;
1638                         t->used_replica = false;
1639                 }
1640         }
1641
1642         if (unpaused || legacy_change || force_resend || split)
1643                 ct_res = CALC_TARGET_NEED_RESEND;
1644         else
1645                 ct_res = CALC_TARGET_NO_ACTION;
1646
1647 out:
1648         dout("%s t %p -> %d%d%d%d ct_res %d osd%d\n", __func__, t, unpaused,
1649              legacy_change, force_resend, split, ct_res, t->osd);
1650         return ct_res;
1651 }
1652
1653 static struct ceph_spg_mapping *alloc_spg_mapping(void)
1654 {
1655         struct ceph_spg_mapping *spg;
1656
1657         spg = kmalloc(sizeof(*spg), GFP_NOIO);
1658         if (!spg)
1659                 return NULL;
1660
1661         RB_CLEAR_NODE(&spg->node);
1662         spg->backoffs = RB_ROOT;
1663         return spg;
1664 }
1665
1666 static void free_spg_mapping(struct ceph_spg_mapping *spg)
1667 {
1668         WARN_ON(!RB_EMPTY_NODE(&spg->node));
1669         WARN_ON(!RB_EMPTY_ROOT(&spg->backoffs));
1670
1671         kfree(spg);
1672 }
1673
1674 /*
1675  * rbtree of ceph_spg_mapping for handling map<spg_t, ...>, similar to
1676  * ceph_pg_mapping.  Used to track OSD backoffs -- a backoff [range] is
1677  * defined only within a specific spgid; it does not pass anything to
1678  * children on split, or to another primary.
1679  */
1680 DEFINE_RB_FUNCS2(spg_mapping, struct ceph_spg_mapping, spgid, ceph_spg_compare,
1681                  RB_BYPTR, const struct ceph_spg *, node)
1682
1683 static u64 hoid_get_bitwise_key(const struct ceph_hobject_id *hoid)
1684 {
1685         return hoid->is_max ? 0x100000000ull : hoid->hash_reverse_bits;
1686 }
1687
1688 static void hoid_get_effective_key(const struct ceph_hobject_id *hoid,
1689                                    void **pkey, size_t *pkey_len)
1690 {
1691         if (hoid->key_len) {
1692                 *pkey = hoid->key;
1693                 *pkey_len = hoid->key_len;
1694         } else {
1695                 *pkey = hoid->oid;
1696                 *pkey_len = hoid->oid_len;
1697         }
1698 }
1699
1700 static int compare_names(const void *name1, size_t name1_len,
1701                          const void *name2, size_t name2_len)
1702 {
1703         int ret;
1704
1705         ret = memcmp(name1, name2, min(name1_len, name2_len));
1706         if (!ret) {
1707                 if (name1_len < name2_len)
1708                         ret = -1;
1709                 else if (name1_len > name2_len)
1710                         ret = 1;
1711         }
1712         return ret;
1713 }
1714
1715 static int hoid_compare(const struct ceph_hobject_id *lhs,
1716                         const struct ceph_hobject_id *rhs)
1717 {
1718         void *effective_key1, *effective_key2;
1719         size_t effective_key1_len, effective_key2_len;
1720         int ret;
1721
1722         if (lhs->is_max < rhs->is_max)
1723                 return -1;
1724         if (lhs->is_max > rhs->is_max)
1725                 return 1;
1726
1727         if (lhs->pool < rhs->pool)
1728                 return -1;
1729         if (lhs->pool > rhs->pool)
1730                 return 1;
1731
1732         if (hoid_get_bitwise_key(lhs) < hoid_get_bitwise_key(rhs))
1733                 return -1;
1734         if (hoid_get_bitwise_key(lhs) > hoid_get_bitwise_key(rhs))
1735                 return 1;
1736
1737         ret = compare_names(lhs->nspace, lhs->nspace_len,
1738                             rhs->nspace, rhs->nspace_len);
1739         if (ret)
1740                 return ret;
1741
1742         hoid_get_effective_key(lhs, &effective_key1, &effective_key1_len);
1743         hoid_get_effective_key(rhs, &effective_key2, &effective_key2_len);
1744         ret = compare_names(effective_key1, effective_key1_len,
1745                             effective_key2, effective_key2_len);
1746         if (ret)
1747                 return ret;
1748
1749         ret = compare_names(lhs->oid, lhs->oid_len, rhs->oid, rhs->oid_len);
1750         if (ret)
1751                 return ret;
1752
1753         if (lhs->snapid < rhs->snapid)
1754                 return -1;
1755         if (lhs->snapid > rhs->snapid)
1756                 return 1;
1757
1758         return 0;
1759 }
1760
1761 /*
1762  * For decoding ->begin and ->end of MOSDBackoff only -- no MIN/MAX
1763  * compat stuff here.
1764  *
1765  * Assumes @hoid is zero-initialized.
1766  */
1767 static int decode_hoid(void **p, void *end, struct ceph_hobject_id *hoid)
1768 {
1769         u8 struct_v;
1770         u32 struct_len;
1771         int ret;
1772
1773         ret = ceph_start_decoding(p, end, 4, "hobject_t", &struct_v,
1774                                   &struct_len);
1775         if (ret)
1776                 return ret;
1777
1778         if (struct_v < 4) {
1779                 pr_err("got struct_v %d < 4 of hobject_t\n", struct_v);
1780                 goto e_inval;
1781         }
1782
1783         hoid->key = ceph_extract_encoded_string(p, end, &hoid->key_len,
1784                                                 GFP_NOIO);
1785         if (IS_ERR(hoid->key)) {
1786                 ret = PTR_ERR(hoid->key);
1787                 hoid->key = NULL;
1788                 return ret;
1789         }
1790
1791         hoid->oid = ceph_extract_encoded_string(p, end, &hoid->oid_len,
1792                                                 GFP_NOIO);
1793         if (IS_ERR(hoid->oid)) {
1794                 ret = PTR_ERR(hoid->oid);
1795                 hoid->oid = NULL;
1796                 return ret;
1797         }
1798
1799         ceph_decode_64_safe(p, end, hoid->snapid, e_inval);
1800         ceph_decode_32_safe(p, end, hoid->hash, e_inval);
1801         ceph_decode_8_safe(p, end, hoid->is_max, e_inval);
1802
1803         hoid->nspace = ceph_extract_encoded_string(p, end, &hoid->nspace_len,
1804                                                    GFP_NOIO);
1805         if (IS_ERR(hoid->nspace)) {
1806                 ret = PTR_ERR(hoid->nspace);
1807                 hoid->nspace = NULL;
1808                 return ret;
1809         }
1810
1811         ceph_decode_64_safe(p, end, hoid->pool, e_inval);
1812
1813         ceph_hoid_build_hash_cache(hoid);
1814         return 0;
1815
1816 e_inval:
1817         return -EINVAL;
1818 }
1819
1820 static int hoid_encoding_size(const struct ceph_hobject_id *hoid)
1821 {
1822         return 8 + 4 + 1 + 8 + /* snapid, hash, is_max, pool */
1823                4 + hoid->key_len + 4 + hoid->oid_len + 4 + hoid->nspace_len;
1824 }
1825
1826 static void encode_hoid(void **p, void *end, const struct ceph_hobject_id *hoid)
1827 {
1828         ceph_start_encoding(p, 4, 3, hoid_encoding_size(hoid));
1829         ceph_encode_string(p, end, hoid->key, hoid->key_len);
1830         ceph_encode_string(p, end, hoid->oid, hoid->oid_len);
1831         ceph_encode_64(p, hoid->snapid);
1832         ceph_encode_32(p, hoid->hash);
1833         ceph_encode_8(p, hoid->is_max);
1834         ceph_encode_string(p, end, hoid->nspace, hoid->nspace_len);
1835         ceph_encode_64(p, hoid->pool);
1836 }
1837
1838 static void free_hoid(struct ceph_hobject_id *hoid)
1839 {
1840         if (hoid) {
1841                 kfree(hoid->key);
1842                 kfree(hoid->oid);
1843                 kfree(hoid->nspace);
1844                 kfree(hoid);
1845         }
1846 }
1847
1848 static struct ceph_osd_backoff *alloc_backoff(void)
1849 {
1850         struct ceph_osd_backoff *backoff;
1851
1852         backoff = kzalloc(sizeof(*backoff), GFP_NOIO);
1853         if (!backoff)
1854                 return NULL;
1855
1856         RB_CLEAR_NODE(&backoff->spg_node);
1857         RB_CLEAR_NODE(&backoff->id_node);
1858         return backoff;
1859 }
1860
1861 static void free_backoff(struct ceph_osd_backoff *backoff)
1862 {
1863         WARN_ON(!RB_EMPTY_NODE(&backoff->spg_node));
1864         WARN_ON(!RB_EMPTY_NODE(&backoff->id_node));
1865
1866         free_hoid(backoff->begin);
1867         free_hoid(backoff->end);
1868         kfree(backoff);
1869 }
1870
1871 /*
1872  * Within a specific spgid, backoffs are managed by ->begin hoid.
1873  */
1874 DEFINE_RB_INSDEL_FUNCS2(backoff, struct ceph_osd_backoff, begin, hoid_compare,
1875                         RB_BYVAL, spg_node);
1876
1877 static struct ceph_osd_backoff *lookup_containing_backoff(struct rb_root *root,
1878                                             const struct ceph_hobject_id *hoid)
1879 {
1880         struct rb_node *n = root->rb_node;
1881
1882         while (n) {
1883                 struct ceph_osd_backoff *cur =
1884                     rb_entry(n, struct ceph_osd_backoff, spg_node);
1885                 int cmp;
1886
1887                 cmp = hoid_compare(hoid, cur->begin);
1888                 if (cmp < 0) {
1889                         n = n->rb_left;
1890                 } else if (cmp > 0) {
1891                         if (hoid_compare(hoid, cur->end) < 0)
1892                                 return cur;
1893
1894                         n = n->rb_right;
1895                 } else {
1896                         return cur;
1897                 }
1898         }
1899
1900         return NULL;
1901 }
1902
1903 /*
1904  * Each backoff has a unique id within its OSD session.
1905  */
1906 DEFINE_RB_FUNCS(backoff_by_id, struct ceph_osd_backoff, id, id_node)
1907
1908 static void clear_backoffs(struct ceph_osd *osd)
1909 {
1910         while (!RB_EMPTY_ROOT(&osd->o_backoff_mappings)) {
1911                 struct ceph_spg_mapping *spg =
1912                     rb_entry(rb_first(&osd->o_backoff_mappings),
1913                              struct ceph_spg_mapping, node);
1914
1915                 while (!RB_EMPTY_ROOT(&spg->backoffs)) {
1916                         struct ceph_osd_backoff *backoff =
1917                             rb_entry(rb_first(&spg->backoffs),
1918                                      struct ceph_osd_backoff, spg_node);
1919
1920                         erase_backoff(&spg->backoffs, backoff);
1921                         erase_backoff_by_id(&osd->o_backoffs_by_id, backoff);
1922                         free_backoff(backoff);
1923                 }
1924                 erase_spg_mapping(&osd->o_backoff_mappings, spg);
1925                 free_spg_mapping(spg);
1926         }
1927 }
1928
1929 /*
1930  * Set up a temporary, non-owning view into @t.
1931  */
1932 static void hoid_fill_from_target(struct ceph_hobject_id *hoid,
1933                                   const struct ceph_osd_request_target *t)
1934 {
1935         hoid->key = NULL;
1936         hoid->key_len = 0;
1937         hoid->oid = t->target_oid.name;
1938         hoid->oid_len = t->target_oid.name_len;
1939         hoid->snapid = CEPH_NOSNAP;
1940         hoid->hash = t->pgid.seed;
1941         hoid->is_max = false;
1942         if (t->target_oloc.pool_ns) {
1943                 hoid->nspace = t->target_oloc.pool_ns->str;
1944                 hoid->nspace_len = t->target_oloc.pool_ns->len;
1945         } else {
1946                 hoid->nspace = NULL;
1947                 hoid->nspace_len = 0;
1948         }
1949         hoid->pool = t->target_oloc.pool;
1950         ceph_hoid_build_hash_cache(hoid);
1951 }
1952
1953 static bool should_plug_request(struct ceph_osd_request *req)
1954 {
1955         struct ceph_osd *osd = req->r_osd;
1956         struct ceph_spg_mapping *spg;
1957         struct ceph_osd_backoff *backoff;
1958         struct ceph_hobject_id hoid;
1959
1960         spg = lookup_spg_mapping(&osd->o_backoff_mappings, &req->r_t.spgid);
1961         if (!spg)
1962                 return false;
1963
1964         hoid_fill_from_target(&hoid, &req->r_t);
1965         backoff = lookup_containing_backoff(&spg->backoffs, &hoid);
1966         if (!backoff)
1967                 return false;
1968
1969         dout("%s req %p tid %llu backoff osd%d spgid %llu.%xs%d id %llu\n",
1970              __func__, req, req->r_tid, osd->o_osd, backoff->spgid.pgid.pool,
1971              backoff->spgid.pgid.seed, backoff->spgid.shard, backoff->id);
1972         return true;
1973 }
1974
1975 /*
1976  * Keep get_num_data_items() in sync with this function.
1977  */
1978 static void setup_request_data(struct ceph_osd_request *req)
1979 {
1980         struct ceph_msg *request_msg = req->r_request;
1981         struct ceph_msg *reply_msg = req->r_reply;
1982         struct ceph_osd_req_op *op;
1983
1984         if (req->r_request->num_data_items || req->r_reply->num_data_items)
1985                 return;
1986
1987         WARN_ON(request_msg->data_length || reply_msg->data_length);
1988         for (op = req->r_ops; op != &req->r_ops[req->r_num_ops]; op++) {
1989                 switch (op->op) {
1990                 /* request */
1991                 case CEPH_OSD_OP_WRITE:
1992                 case CEPH_OSD_OP_WRITEFULL:
1993                         WARN_ON(op->indata_len != op->extent.length);
1994                         ceph_osdc_msg_data_add(request_msg,
1995                                                &op->extent.osd_data);
1996                         break;
1997                 case CEPH_OSD_OP_SETXATTR:
1998                 case CEPH_OSD_OP_CMPXATTR:
1999                         WARN_ON(op->indata_len != op->xattr.name_len +
2000                                                   op->xattr.value_len);
2001                         ceph_osdc_msg_data_add(request_msg,
2002                                                &op->xattr.osd_data);
2003                         break;
2004                 case CEPH_OSD_OP_NOTIFY_ACK:
2005                         ceph_osdc_msg_data_add(request_msg,
2006                                                &op->notify_ack.request_data);
2007                         break;
2008                 case CEPH_OSD_OP_COPY_FROM2:
2009                         ceph_osdc_msg_data_add(request_msg,
2010                                                &op->copy_from.osd_data);
2011                         break;
2012
2013                 /* reply */
2014                 case CEPH_OSD_OP_STAT:
2015                         ceph_osdc_msg_data_add(reply_msg,
2016                                                &op->raw_data_in);
2017                         break;
2018                 case CEPH_OSD_OP_READ:
2019                         ceph_osdc_msg_data_add(reply_msg,
2020                                                &op->extent.osd_data);
2021                         break;
2022                 case CEPH_OSD_OP_LIST_WATCHERS:
2023                         ceph_osdc_msg_data_add(reply_msg,
2024                                                &op->list_watchers.response_data);
2025                         break;
2026
2027                 /* both */
2028                 case CEPH_OSD_OP_CALL:
2029                         WARN_ON(op->indata_len != op->cls.class_len +
2030                                                   op->cls.method_len +
2031                                                   op->cls.indata_len);
2032                         ceph_osdc_msg_data_add(request_msg,
2033                                                &op->cls.request_info);
2034                         /* optional, can be NONE */
2035                         ceph_osdc_msg_data_add(request_msg,
2036                                                &op->cls.request_data);
2037                         /* optional, can be NONE */
2038                         ceph_osdc_msg_data_add(reply_msg,
2039                                                &op->cls.response_data);
2040                         break;
2041                 case CEPH_OSD_OP_NOTIFY:
2042                         ceph_osdc_msg_data_add(request_msg,
2043                                                &op->notify.request_data);
2044                         ceph_osdc_msg_data_add(reply_msg,
2045                                                &op->notify.response_data);
2046                         break;
2047                 }
2048         }
2049 }
2050
2051 static void encode_pgid(void **p, const struct ceph_pg *pgid)
2052 {
2053         ceph_encode_8(p, 1);
2054         ceph_encode_64(p, pgid->pool);
2055         ceph_encode_32(p, pgid->seed);
2056         ceph_encode_32(p, -1); /* preferred */
2057 }
2058
2059 static void encode_spgid(void **p, const struct ceph_spg *spgid)
2060 {
2061         ceph_start_encoding(p, 1, 1, CEPH_PGID_ENCODING_LEN + 1);
2062         encode_pgid(p, &spgid->pgid);
2063         ceph_encode_8(p, spgid->shard);
2064 }
2065
2066 static void encode_oloc(void **p, void *end,
2067                         const struct ceph_object_locator *oloc)
2068 {
2069         ceph_start_encoding(p, 5, 4, ceph_oloc_encoding_size(oloc));
2070         ceph_encode_64(p, oloc->pool);
2071         ceph_encode_32(p, -1); /* preferred */
2072         ceph_encode_32(p, 0);  /* key len */
2073         if (oloc->pool_ns)
2074                 ceph_encode_string(p, end, oloc->pool_ns->str,
2075                                    oloc->pool_ns->len);
2076         else
2077                 ceph_encode_32(p, 0);
2078 }
2079
2080 static void encode_request_partial(struct ceph_osd_request *req,
2081                                    struct ceph_msg *msg)
2082 {
2083         void *p = msg->front.iov_base;
2084         void *const end = p + msg->front_alloc_len;
2085         u32 data_len = 0;
2086         int i;
2087
2088         if (req->r_flags & CEPH_OSD_FLAG_WRITE) {
2089                 /* snapshots aren't writeable */
2090                 WARN_ON(req->r_snapid != CEPH_NOSNAP);
2091         } else {
2092                 WARN_ON(req->r_mtime.tv_sec || req->r_mtime.tv_nsec ||
2093                         req->r_data_offset || req->r_snapc);
2094         }
2095
2096         setup_request_data(req);
2097
2098         encode_spgid(&p, &req->r_t.spgid); /* actual spg */
2099         ceph_encode_32(&p, req->r_t.pgid.seed); /* raw hash */
2100         ceph_encode_32(&p, req->r_osdc->osdmap->epoch);
2101         ceph_encode_32(&p, req->r_flags);
2102
2103         /* reqid */
2104         ceph_start_encoding(&p, 2, 2, sizeof(struct ceph_osd_reqid));
2105         memset(p, 0, sizeof(struct ceph_osd_reqid));
2106         p += sizeof(struct ceph_osd_reqid);
2107
2108         /* trace */
2109         memset(p, 0, sizeof(struct ceph_blkin_trace_info));
2110         p += sizeof(struct ceph_blkin_trace_info);
2111
2112         ceph_encode_32(&p, 0); /* client_inc, always 0 */
2113         ceph_encode_timespec64(p, &req->r_mtime);
2114         p += sizeof(struct ceph_timespec);
2115
2116         encode_oloc(&p, end, &req->r_t.target_oloc);
2117         ceph_encode_string(&p, end, req->r_t.target_oid.name,
2118                            req->r_t.target_oid.name_len);
2119
2120         /* ops, can imply data */
2121         ceph_encode_16(&p, req->r_num_ops);
2122         for (i = 0; i < req->r_num_ops; i++) {
2123                 data_len += osd_req_encode_op(p, &req->r_ops[i]);
2124                 p += sizeof(struct ceph_osd_op);
2125         }
2126
2127         ceph_encode_64(&p, req->r_snapid); /* snapid */
2128         if (req->r_snapc) {
2129                 ceph_encode_64(&p, req->r_snapc->seq);
2130                 ceph_encode_32(&p, req->r_snapc->num_snaps);
2131                 for (i = 0; i < req->r_snapc->num_snaps; i++)
2132                         ceph_encode_64(&p, req->r_snapc->snaps[i]);
2133         } else {
2134                 ceph_encode_64(&p, 0); /* snap_seq */
2135                 ceph_encode_32(&p, 0); /* snaps len */
2136         }
2137
2138         ceph_encode_32(&p, req->r_attempts); /* retry_attempt */
2139         BUG_ON(p > end - 8); /* space for features */
2140
2141         msg->hdr.version = cpu_to_le16(8); /* MOSDOp v8 */
2142         /* front_len is finalized in encode_request_finish() */
2143         msg->front.iov_len = p - msg->front.iov_base;
2144         msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2145         msg->hdr.data_len = cpu_to_le32(data_len);
2146         /*
2147          * The header "data_off" is a hint to the receiver allowing it
2148          * to align received data into its buffers such that there's no
2149          * need to re-copy it before writing it to disk (direct I/O).
2150          */
2151         msg->hdr.data_off = cpu_to_le16(req->r_data_offset);
2152
2153         dout("%s req %p msg %p oid %s oid_len %d\n", __func__, req, msg,
2154              req->r_t.target_oid.name, req->r_t.target_oid.name_len);
2155 }
2156
2157 static void encode_request_finish(struct ceph_msg *msg)
2158 {
2159         void *p = msg->front.iov_base;
2160         void *const partial_end = p + msg->front.iov_len;
2161         void *const end = p + msg->front_alloc_len;
2162
2163         if (CEPH_HAVE_FEATURE(msg->con->peer_features, RESEND_ON_SPLIT)) {
2164                 /* luminous OSD -- encode features and be done */
2165                 p = partial_end;
2166                 ceph_encode_64(&p, msg->con->peer_features);
2167         } else {
2168                 struct {
2169                         char spgid[CEPH_ENCODING_START_BLK_LEN +
2170                                    CEPH_PGID_ENCODING_LEN + 1];
2171                         __le32 hash;
2172                         __le32 epoch;
2173                         __le32 flags;
2174                         char reqid[CEPH_ENCODING_START_BLK_LEN +
2175                                    sizeof(struct ceph_osd_reqid)];
2176                         char trace[sizeof(struct ceph_blkin_trace_info)];
2177                         __le32 client_inc;
2178                         struct ceph_timespec mtime;
2179                 } __packed head;
2180                 struct ceph_pg pgid;
2181                 void *oloc, *oid, *tail;
2182                 int oloc_len, oid_len, tail_len;
2183                 int len;
2184
2185                 /*
2186                  * Pre-luminous OSD -- reencode v8 into v4 using @head
2187                  * as a temporary buffer.  Encode the raw PG; the rest
2188                  * is just a matter of moving oloc, oid and tail blobs
2189                  * around.
2190                  */
2191                 memcpy(&head, p, sizeof(head));
2192                 p += sizeof(head);
2193
2194                 oloc = p;
2195                 p += CEPH_ENCODING_START_BLK_LEN;
2196                 pgid.pool = ceph_decode_64(&p);
2197                 p += 4 + 4; /* preferred, key len */
2198                 len = ceph_decode_32(&p);
2199                 p += len;   /* nspace */
2200                 oloc_len = p - oloc;
2201
2202                 oid = p;
2203                 len = ceph_decode_32(&p);
2204                 p += len;
2205                 oid_len = p - oid;
2206
2207                 tail = p;
2208                 tail_len = partial_end - p;
2209
2210                 p = msg->front.iov_base;
2211                 ceph_encode_copy(&p, &head.client_inc, sizeof(head.client_inc));
2212                 ceph_encode_copy(&p, &head.epoch, sizeof(head.epoch));
2213                 ceph_encode_copy(&p, &head.flags, sizeof(head.flags));
2214                 ceph_encode_copy(&p, &head.mtime, sizeof(head.mtime));
2215
2216                 /* reassert_version */
2217                 memset(p, 0, sizeof(struct ceph_eversion));
2218                 p += sizeof(struct ceph_eversion);
2219
2220                 BUG_ON(p >= oloc);
2221                 memmove(p, oloc, oloc_len);
2222                 p += oloc_len;
2223
2224                 pgid.seed = le32_to_cpu(head.hash);
2225                 encode_pgid(&p, &pgid); /* raw pg */
2226
2227                 BUG_ON(p >= oid);
2228                 memmove(p, oid, oid_len);
2229                 p += oid_len;
2230
2231                 /* tail -- ops, snapid, snapc, retry_attempt */
2232                 BUG_ON(p >= tail);
2233                 memmove(p, tail, tail_len);
2234                 p += tail_len;
2235
2236                 msg->hdr.version = cpu_to_le16(4); /* MOSDOp v4 */
2237         }
2238
2239         BUG_ON(p > end);
2240         msg->front.iov_len = p - msg->front.iov_base;
2241         msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2242
2243         dout("%s msg %p tid %llu %u+%u+%u v%d\n", __func__, msg,
2244              le64_to_cpu(msg->hdr.tid), le32_to_cpu(msg->hdr.front_len),
2245              le32_to_cpu(msg->hdr.middle_len), le32_to_cpu(msg->hdr.data_len),
2246              le16_to_cpu(msg->hdr.version));
2247 }
2248
2249 /*
2250  * @req has to be assigned a tid and registered.
2251  */
2252 static void send_request(struct ceph_osd_request *req)
2253 {
2254         struct ceph_osd *osd = req->r_osd;
2255
2256         verify_osd_locked(osd);
2257         WARN_ON(osd->o_osd != req->r_t.osd);
2258
2259         /* backoff? */
2260         if (should_plug_request(req))
2261                 return;
2262
2263         /*
2264          * We may have a previously queued request message hanging
2265          * around.  Cancel it to avoid corrupting the msgr.
2266          */
2267         if (req->r_sent)
2268                 ceph_msg_revoke(req->r_request);
2269
2270         req->r_flags |= CEPH_OSD_FLAG_KNOWN_REDIR;
2271         if (req->r_attempts)
2272                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
2273         else
2274                 WARN_ON(req->r_flags & CEPH_OSD_FLAG_RETRY);
2275
2276         encode_request_partial(req, req->r_request);
2277
2278         dout("%s req %p tid %llu to pgid %llu.%x spgid %llu.%xs%d osd%d e%u flags 0x%x attempt %d\n",
2279              __func__, req, req->r_tid, req->r_t.pgid.pool, req->r_t.pgid.seed,
2280              req->r_t.spgid.pgid.pool, req->r_t.spgid.pgid.seed,
2281              req->r_t.spgid.shard, osd->o_osd, req->r_t.epoch, req->r_flags,
2282              req->r_attempts);
2283
2284         req->r_t.paused = false;
2285         req->r_stamp = jiffies;
2286         req->r_attempts++;
2287
2288         req->r_sent = osd->o_incarnation;
2289         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
2290         ceph_con_send(&osd->o_con, ceph_msg_get(req->r_request));
2291 }
2292
2293 static void maybe_request_map(struct ceph_osd_client *osdc)
2294 {
2295         bool continuous = false;
2296
2297         verify_osdc_locked(osdc);
2298         WARN_ON(!osdc->osdmap->epoch);
2299
2300         if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
2301             ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD) ||
2302             ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR)) {
2303                 dout("%s osdc %p continuous\n", __func__, osdc);
2304                 continuous = true;
2305         } else {
2306                 dout("%s osdc %p onetime\n", __func__, osdc);
2307         }
2308
2309         if (ceph_monc_want_map(&osdc->client->monc, CEPH_SUB_OSDMAP,
2310                                osdc->osdmap->epoch + 1, continuous))
2311                 ceph_monc_renew_subs(&osdc->client->monc);
2312 }
2313
2314 static void complete_request(struct ceph_osd_request *req, int err);
2315 static void send_map_check(struct ceph_osd_request *req);
2316
2317 static void __submit_request(struct ceph_osd_request *req, bool wrlocked)
2318 {
2319         struct ceph_osd_client *osdc = req->r_osdc;
2320         struct ceph_osd *osd;
2321         enum calc_target_result ct_res;
2322         int err = 0;
2323         bool need_send = false;
2324         bool promoted = false;
2325
2326         WARN_ON(req->r_tid);
2327         dout("%s req %p wrlocked %d\n", __func__, req, wrlocked);
2328
2329 again:
2330         ct_res = calc_target(osdc, &req->r_t, false);
2331         if (ct_res == CALC_TARGET_POOL_DNE && !wrlocked)
2332                 goto promote;
2333
2334         osd = lookup_create_osd(osdc, req->r_t.osd, wrlocked);
2335         if (IS_ERR(osd)) {
2336                 WARN_ON(PTR_ERR(osd) != -EAGAIN || wrlocked);
2337                 goto promote;
2338         }
2339
2340         if (osdc->abort_err) {
2341                 dout("req %p abort_err %d\n", req, osdc->abort_err);
2342                 err = osdc->abort_err;
2343         } else if (osdc->osdmap->epoch < osdc->epoch_barrier) {
2344                 dout("req %p epoch %u barrier %u\n", req, osdc->osdmap->epoch,
2345                      osdc->epoch_barrier);
2346                 req->r_t.paused = true;
2347                 maybe_request_map(osdc);
2348         } else if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
2349                    ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR)) {
2350                 dout("req %p pausewr\n", req);
2351                 req->r_t.paused = true;
2352                 maybe_request_map(osdc);
2353         } else if ((req->r_flags & CEPH_OSD_FLAG_READ) &&
2354                    ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD)) {
2355                 dout("req %p pauserd\n", req);
2356                 req->r_t.paused = true;
2357                 maybe_request_map(osdc);
2358         } else if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
2359                    !(req->r_flags & (CEPH_OSD_FLAG_FULL_TRY |
2360                                      CEPH_OSD_FLAG_FULL_FORCE)) &&
2361                    (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
2362                     pool_full(osdc, req->r_t.base_oloc.pool))) {
2363                 dout("req %p full/pool_full\n", req);
2364                 if (ceph_test_opt(osdc->client, ABORT_ON_FULL)) {
2365                         err = -ENOSPC;
2366                 } else {
2367                         if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL))
2368                                 pr_warn_ratelimited("cluster is full (osdmap FULL)\n");
2369                         else
2370                                 pr_warn_ratelimited("pool %lld is full or reached quota\n",
2371                                                     req->r_t.base_oloc.pool);
2372                         req->r_t.paused = true;
2373                         maybe_request_map(osdc);
2374                 }
2375         } else if (!osd_homeless(osd)) {
2376                 need_send = true;
2377         } else {
2378                 maybe_request_map(osdc);
2379         }
2380
2381         mutex_lock(&osd->lock);
2382         /*
2383          * Assign the tid atomically with send_request() to protect
2384          * multiple writes to the same object from racing with each
2385          * other, resulting in out of order ops on the OSDs.
2386          */
2387         req->r_tid = atomic64_inc_return(&osdc->last_tid);
2388         link_request(osd, req);
2389         if (need_send)
2390                 send_request(req);
2391         else if (err)
2392                 complete_request(req, err);
2393         mutex_unlock(&osd->lock);
2394
2395         if (!err && ct_res == CALC_TARGET_POOL_DNE)
2396                 send_map_check(req);
2397
2398         if (promoted)
2399                 downgrade_write(&osdc->lock);
2400         return;
2401
2402 promote:
2403         up_read(&osdc->lock);
2404         down_write(&osdc->lock);
2405         wrlocked = true;
2406         promoted = true;
2407         goto again;
2408 }
2409
2410 static void account_request(struct ceph_osd_request *req)
2411 {
2412         WARN_ON(req->r_flags & (CEPH_OSD_FLAG_ACK | CEPH_OSD_FLAG_ONDISK));
2413         WARN_ON(!(req->r_flags & (CEPH_OSD_FLAG_READ | CEPH_OSD_FLAG_WRITE)));
2414
2415         req->r_flags |= CEPH_OSD_FLAG_ONDISK;
2416         atomic_inc(&req->r_osdc->num_requests);
2417
2418         req->r_start_stamp = jiffies;
2419         req->r_start_latency = ktime_get();
2420 }
2421
2422 static void submit_request(struct ceph_osd_request *req, bool wrlocked)
2423 {
2424         ceph_osdc_get_request(req);
2425         account_request(req);
2426         __submit_request(req, wrlocked);
2427 }
2428
2429 static void finish_request(struct ceph_osd_request *req)
2430 {
2431         struct ceph_osd_client *osdc = req->r_osdc;
2432
2433         WARN_ON(lookup_request_mc(&osdc->map_checks, req->r_tid));
2434         dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
2435
2436         req->r_end_latency = ktime_get();
2437
2438         if (req->r_osd)
2439                 unlink_request(req->r_osd, req);
2440         atomic_dec(&osdc->num_requests);
2441
2442         /*
2443          * If an OSD has failed or returned and a request has been sent
2444          * twice, it's possible to get a reply and end up here while the
2445          * request message is queued for delivery.  We will ignore the
2446          * reply, so not a big deal, but better to try and catch it.
2447          */
2448         ceph_msg_revoke(req->r_request);
2449         ceph_msg_revoke_incoming(req->r_reply);
2450 }
2451
2452 static void __complete_request(struct ceph_osd_request *req)
2453 {
2454         dout("%s req %p tid %llu cb %ps result %d\n", __func__, req,
2455              req->r_tid, req->r_callback, req->r_result);
2456
2457         if (req->r_callback)
2458                 req->r_callback(req);
2459         complete_all(&req->r_completion);
2460         ceph_osdc_put_request(req);
2461 }
2462
2463 static void complete_request_workfn(struct work_struct *work)
2464 {
2465         struct ceph_osd_request *req =
2466             container_of(work, struct ceph_osd_request, r_complete_work);
2467
2468         __complete_request(req);
2469 }
2470
2471 /*
2472  * This is open-coded in handle_reply().
2473  */
2474 static void complete_request(struct ceph_osd_request *req, int err)
2475 {
2476         dout("%s req %p tid %llu err %d\n", __func__, req, req->r_tid, err);
2477
2478         req->r_result = err;
2479         finish_request(req);
2480
2481         INIT_WORK(&req->r_complete_work, complete_request_workfn);
2482         queue_work(req->r_osdc->completion_wq, &req->r_complete_work);
2483 }
2484
2485 static void cancel_map_check(struct ceph_osd_request *req)
2486 {
2487         struct ceph_osd_client *osdc = req->r_osdc;
2488         struct ceph_osd_request *lookup_req;
2489
2490         verify_osdc_wrlocked(osdc);
2491
2492         lookup_req = lookup_request_mc(&osdc->map_checks, req->r_tid);
2493         if (!lookup_req)
2494                 return;
2495
2496         WARN_ON(lookup_req != req);
2497         erase_request_mc(&osdc->map_checks, req);
2498         ceph_osdc_put_request(req);
2499 }
2500
2501 static void cancel_request(struct ceph_osd_request *req)
2502 {
2503         dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
2504
2505         cancel_map_check(req);
2506         finish_request(req);
2507         complete_all(&req->r_completion);
2508         ceph_osdc_put_request(req);
2509 }
2510
2511 static void abort_request(struct ceph_osd_request *req, int err)
2512 {
2513         dout("%s req %p tid %llu err %d\n", __func__, req, req->r_tid, err);
2514
2515         cancel_map_check(req);
2516         complete_request(req, err);
2517 }
2518
2519 static int abort_fn(struct ceph_osd_request *req, void *arg)
2520 {
2521         int err = *(int *)arg;
2522
2523         abort_request(req, err);
2524         return 0; /* continue iteration */
2525 }
2526
2527 /*
2528  * Abort all in-flight requests with @err and arrange for all future
2529  * requests to be failed immediately.
2530  */
2531 void ceph_osdc_abort_requests(struct ceph_osd_client *osdc, int err)
2532 {
2533         dout("%s osdc %p err %d\n", __func__, osdc, err);
2534         down_write(&osdc->lock);
2535         for_each_request(osdc, abort_fn, &err);
2536         osdc->abort_err = err;
2537         up_write(&osdc->lock);
2538 }
2539 EXPORT_SYMBOL(ceph_osdc_abort_requests);
2540
2541 void ceph_osdc_clear_abort_err(struct ceph_osd_client *osdc)
2542 {
2543         down_write(&osdc->lock);
2544         osdc->abort_err = 0;
2545         up_write(&osdc->lock);
2546 }
2547 EXPORT_SYMBOL(ceph_osdc_clear_abort_err);
2548
2549 static void update_epoch_barrier(struct ceph_osd_client *osdc, u32 eb)
2550 {
2551         if (likely(eb > osdc->epoch_barrier)) {
2552                 dout("updating epoch_barrier from %u to %u\n",
2553                                 osdc->epoch_barrier, eb);
2554                 osdc->epoch_barrier = eb;
2555                 /* Request map if we're not to the barrier yet */
2556                 if (eb > osdc->osdmap->epoch)
2557                         maybe_request_map(osdc);
2558         }
2559 }
2560
2561 void ceph_osdc_update_epoch_barrier(struct ceph_osd_client *osdc, u32 eb)
2562 {
2563         down_read(&osdc->lock);
2564         if (unlikely(eb > osdc->epoch_barrier)) {
2565                 up_read(&osdc->lock);
2566                 down_write(&osdc->lock);
2567                 update_epoch_barrier(osdc, eb);
2568                 up_write(&osdc->lock);
2569         } else {
2570                 up_read(&osdc->lock);
2571         }
2572 }
2573 EXPORT_SYMBOL(ceph_osdc_update_epoch_barrier);
2574
2575 /*
2576  * We can end up releasing caps as a result of abort_request().
2577  * In that case, we probably want to ensure that the cap release message
2578  * has an updated epoch barrier in it, so set the epoch barrier prior to
2579  * aborting the first request.
2580  */
2581 static int abort_on_full_fn(struct ceph_osd_request *req, void *arg)
2582 {
2583         struct ceph_osd_client *osdc = req->r_osdc;
2584         bool *victims = arg;
2585
2586         if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
2587             (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
2588              pool_full(osdc, req->r_t.base_oloc.pool))) {
2589                 if (!*victims) {
2590                         update_epoch_barrier(osdc, osdc->osdmap->epoch);
2591                         *victims = true;
2592                 }
2593                 abort_request(req, -ENOSPC);
2594         }
2595
2596         return 0; /* continue iteration */
2597 }
2598
2599 /*
2600  * Drop all pending requests that are stalled waiting on a full condition to
2601  * clear, and complete them with ENOSPC as the return code. Set the
2602  * osdc->epoch_barrier to the latest map epoch that we've seen if any were
2603  * cancelled.
2604  */
2605 static void ceph_osdc_abort_on_full(struct ceph_osd_client *osdc)
2606 {
2607         bool victims = false;
2608
2609         if (ceph_test_opt(osdc->client, ABORT_ON_FULL) &&
2610             (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) || have_pool_full(osdc)))
2611                 for_each_request(osdc, abort_on_full_fn, &victims);
2612 }
2613
2614 static void check_pool_dne(struct ceph_osd_request *req)
2615 {
2616         struct ceph_osd_client *osdc = req->r_osdc;
2617         struct ceph_osdmap *map = osdc->osdmap;
2618
2619         verify_osdc_wrlocked(osdc);
2620         WARN_ON(!map->epoch);
2621
2622         if (req->r_attempts) {
2623                 /*
2624                  * We sent a request earlier, which means that
2625                  * previously the pool existed, and now it does not
2626                  * (i.e., it was deleted).
2627                  */
2628                 req->r_map_dne_bound = map->epoch;
2629                 dout("%s req %p tid %llu pool disappeared\n", __func__, req,
2630                      req->r_tid);
2631         } else {
2632                 dout("%s req %p tid %llu map_dne_bound %u have %u\n", __func__,
2633                      req, req->r_tid, req->r_map_dne_bound, map->epoch);
2634         }
2635
2636         if (req->r_map_dne_bound) {
2637                 if (map->epoch >= req->r_map_dne_bound) {
2638                         /* we had a new enough map */
2639                         pr_info_ratelimited("tid %llu pool does not exist\n",
2640                                             req->r_tid);
2641                         complete_request(req, -ENOENT);
2642                 }
2643         } else {
2644                 send_map_check(req);
2645         }
2646 }
2647
2648 static void map_check_cb(struct ceph_mon_generic_request *greq)
2649 {
2650         struct ceph_osd_client *osdc = &greq->monc->client->osdc;
2651         struct ceph_osd_request *req;
2652         u64 tid = greq->private_data;
2653
2654         WARN_ON(greq->result || !greq->u.newest);
2655
2656         down_write(&osdc->lock);
2657         req = lookup_request_mc(&osdc->map_checks, tid);
2658         if (!req) {
2659                 dout("%s tid %llu dne\n", __func__, tid);
2660                 goto out_unlock;
2661         }
2662
2663         dout("%s req %p tid %llu map_dne_bound %u newest %llu\n", __func__,
2664              req, req->r_tid, req->r_map_dne_bound, greq->u.newest);
2665         if (!req->r_map_dne_bound)
2666                 req->r_map_dne_bound = greq->u.newest;
2667         erase_request_mc(&osdc->map_checks, req);
2668         check_pool_dne(req);
2669
2670         ceph_osdc_put_request(req);
2671 out_unlock:
2672         up_write(&osdc->lock);
2673 }
2674
2675 static void send_map_check(struct ceph_osd_request *req)
2676 {
2677         struct ceph_osd_client *osdc = req->r_osdc;
2678         struct ceph_osd_request *lookup_req;
2679         int ret;
2680
2681         verify_osdc_wrlocked(osdc);
2682
2683         lookup_req = lookup_request_mc(&osdc->map_checks, req->r_tid);
2684         if (lookup_req) {
2685                 WARN_ON(lookup_req != req);
2686                 return;
2687         }
2688
2689         ceph_osdc_get_request(req);
2690         insert_request_mc(&osdc->map_checks, req);
2691         ret = ceph_monc_get_version_async(&osdc->client->monc, "osdmap",
2692                                           map_check_cb, req->r_tid);
2693         WARN_ON(ret);
2694 }
2695
2696 /*
2697  * lingering requests, watch/notify v2 infrastructure
2698  */
2699 static void linger_release(struct kref *kref)
2700 {
2701         struct ceph_osd_linger_request *lreq =
2702             container_of(kref, struct ceph_osd_linger_request, kref);
2703
2704         dout("%s lreq %p reg_req %p ping_req %p\n", __func__, lreq,
2705              lreq->reg_req, lreq->ping_req);
2706         WARN_ON(!RB_EMPTY_NODE(&lreq->node));
2707         WARN_ON(!RB_EMPTY_NODE(&lreq->osdc_node));
2708         WARN_ON(!RB_EMPTY_NODE(&lreq->mc_node));
2709         WARN_ON(!list_empty(&lreq->scan_item));
2710         WARN_ON(!list_empty(&lreq->pending_lworks));
2711         WARN_ON(lreq->osd);
2712
2713         if (lreq->request_pl)
2714                 ceph_pagelist_release(lreq->request_pl);
2715         if (lreq->notify_id_pages)
2716                 ceph_release_page_vector(lreq->notify_id_pages, 1);
2717
2718         ceph_osdc_put_request(lreq->reg_req);
2719         ceph_osdc_put_request(lreq->ping_req);
2720         target_destroy(&lreq->t);
2721         kfree(lreq);
2722 }
2723
2724 static void linger_put(struct ceph_osd_linger_request *lreq)
2725 {
2726         if (lreq)
2727                 kref_put(&lreq->kref, linger_release);
2728 }
2729
2730 static struct ceph_osd_linger_request *
2731 linger_get(struct ceph_osd_linger_request *lreq)
2732 {
2733         kref_get(&lreq->kref);
2734         return lreq;
2735 }
2736
2737 static struct ceph_osd_linger_request *
2738 linger_alloc(struct ceph_osd_client *osdc)
2739 {
2740         struct ceph_osd_linger_request *lreq;
2741
2742         lreq = kzalloc(sizeof(*lreq), GFP_NOIO);
2743         if (!lreq)
2744                 return NULL;
2745
2746         kref_init(&lreq->kref);
2747         mutex_init(&lreq->lock);
2748         RB_CLEAR_NODE(&lreq->node);
2749         RB_CLEAR_NODE(&lreq->osdc_node);
2750         RB_CLEAR_NODE(&lreq->mc_node);
2751         INIT_LIST_HEAD(&lreq->scan_item);
2752         INIT_LIST_HEAD(&lreq->pending_lworks);
2753         init_completion(&lreq->reg_commit_wait);
2754         init_completion(&lreq->notify_finish_wait);
2755
2756         lreq->osdc = osdc;
2757         target_init(&lreq->t);
2758
2759         dout("%s lreq %p\n", __func__, lreq);
2760         return lreq;
2761 }
2762
2763 DEFINE_RB_INSDEL_FUNCS(linger, struct ceph_osd_linger_request, linger_id, node)
2764 DEFINE_RB_FUNCS(linger_osdc, struct ceph_osd_linger_request, linger_id, osdc_node)
2765 DEFINE_RB_FUNCS(linger_mc, struct ceph_osd_linger_request, linger_id, mc_node)
2766
2767 /*
2768  * Create linger request <-> OSD session relation.
2769  *
2770  * @lreq has to be registered, @osd may be homeless.
2771  */
2772 static void link_linger(struct ceph_osd *osd,
2773                         struct ceph_osd_linger_request *lreq)
2774 {
2775         verify_osd_locked(osd);
2776         WARN_ON(!lreq->linger_id || lreq->osd);
2777         dout("%s osd %p osd%d lreq %p linger_id %llu\n", __func__, osd,
2778              osd->o_osd, lreq, lreq->linger_id);
2779
2780         if (!osd_homeless(osd))
2781                 __remove_osd_from_lru(osd);
2782         else
2783                 atomic_inc(&osd->o_osdc->num_homeless);
2784
2785         get_osd(osd);
2786         insert_linger(&osd->o_linger_requests, lreq);
2787         lreq->osd = osd;
2788 }
2789
2790 static void unlink_linger(struct ceph_osd *osd,
2791                           struct ceph_osd_linger_request *lreq)
2792 {
2793         verify_osd_locked(osd);
2794         WARN_ON(lreq->osd != osd);
2795         dout("%s osd %p osd%d lreq %p linger_id %llu\n", __func__, osd,
2796              osd->o_osd, lreq, lreq->linger_id);
2797
2798         lreq->osd = NULL;
2799         erase_linger(&osd->o_linger_requests, lreq);
2800         put_osd(osd);
2801
2802         if (!osd_homeless(osd))
2803                 maybe_move_osd_to_lru(osd);
2804         else
2805                 atomic_dec(&osd->o_osdc->num_homeless);
2806 }
2807
2808 static bool __linger_registered(struct ceph_osd_linger_request *lreq)
2809 {
2810         verify_osdc_locked(lreq->osdc);
2811
2812         return !RB_EMPTY_NODE(&lreq->osdc_node);
2813 }
2814
2815 static bool linger_registered(struct ceph_osd_linger_request *lreq)
2816 {
2817         struct ceph_osd_client *osdc = lreq->osdc;
2818         bool registered;
2819
2820         down_read(&osdc->lock);
2821         registered = __linger_registered(lreq);
2822         up_read(&osdc->lock);
2823
2824         return registered;
2825 }
2826
2827 static void linger_register(struct ceph_osd_linger_request *lreq)
2828 {
2829         struct ceph_osd_client *osdc = lreq->osdc;
2830
2831         verify_osdc_wrlocked(osdc);
2832         WARN_ON(lreq->linger_id);
2833
2834         linger_get(lreq);
2835         lreq->linger_id = ++osdc->last_linger_id;
2836         insert_linger_osdc(&osdc->linger_requests, lreq);
2837 }
2838
2839 static void linger_unregister(struct ceph_osd_linger_request *lreq)
2840 {
2841         struct ceph_osd_client *osdc = lreq->osdc;
2842
2843         verify_osdc_wrlocked(osdc);
2844
2845         erase_linger_osdc(&osdc->linger_requests, lreq);
2846         linger_put(lreq);
2847 }
2848
2849 static void cancel_linger_request(struct ceph_osd_request *req)
2850 {
2851         struct ceph_osd_linger_request *lreq = req->r_priv;
2852
2853         WARN_ON(!req->r_linger);
2854         cancel_request(req);
2855         linger_put(lreq);
2856 }
2857
2858 struct linger_work {
2859         struct work_struct work;
2860         struct ceph_osd_linger_request *lreq;
2861         struct list_head pending_item;
2862         unsigned long queued_stamp;
2863
2864         union {
2865                 struct {
2866                         u64 notify_id;
2867                         u64 notifier_id;
2868                         void *payload; /* points into @msg front */
2869                         size_t payload_len;
2870
2871                         struct ceph_msg *msg; /* for ceph_msg_put() */
2872                 } notify;
2873                 struct {
2874                         int err;
2875                 } error;
2876         };
2877 };
2878
2879 static struct linger_work *lwork_alloc(struct ceph_osd_linger_request *lreq,
2880                                        work_func_t workfn)
2881 {
2882         struct linger_work *lwork;
2883
2884         lwork = kzalloc(sizeof(*lwork), GFP_NOIO);
2885         if (!lwork)
2886                 return NULL;
2887
2888         INIT_WORK(&lwork->work, workfn);
2889         INIT_LIST_HEAD(&lwork->pending_item);
2890         lwork->lreq = linger_get(lreq);
2891
2892         return lwork;
2893 }
2894
2895 static void lwork_free(struct linger_work *lwork)
2896 {
2897         struct ceph_osd_linger_request *lreq = lwork->lreq;
2898
2899         mutex_lock(&lreq->lock);
2900         list_del(&lwork->pending_item);
2901         mutex_unlock(&lreq->lock);
2902
2903         linger_put(lreq);
2904         kfree(lwork);
2905 }
2906
2907 static void lwork_queue(struct linger_work *lwork)
2908 {
2909         struct ceph_osd_linger_request *lreq = lwork->lreq;
2910         struct ceph_osd_client *osdc = lreq->osdc;
2911
2912         verify_lreq_locked(lreq);
2913         WARN_ON(!list_empty(&lwork->pending_item));
2914
2915         lwork->queued_stamp = jiffies;
2916         list_add_tail(&lwork->pending_item, &lreq->pending_lworks);
2917         queue_work(osdc->notify_wq, &lwork->work);
2918 }
2919
2920 static void do_watch_notify(struct work_struct *w)
2921 {
2922         struct linger_work *lwork = container_of(w, struct linger_work, work);
2923         struct ceph_osd_linger_request *lreq = lwork->lreq;
2924
2925         if (!linger_registered(lreq)) {
2926                 dout("%s lreq %p not registered\n", __func__, lreq);
2927                 goto out;
2928         }
2929
2930         WARN_ON(!lreq->is_watch);
2931         dout("%s lreq %p notify_id %llu notifier_id %llu payload_len %zu\n",
2932              __func__, lreq, lwork->notify.notify_id, lwork->notify.notifier_id,
2933              lwork->notify.payload_len);
2934         lreq->wcb(lreq->data, lwork->notify.notify_id, lreq->linger_id,
2935                   lwork->notify.notifier_id, lwork->notify.payload,
2936                   lwork->notify.payload_len);
2937
2938 out:
2939         ceph_msg_put(lwork->notify.msg);
2940         lwork_free(lwork);
2941 }
2942
2943 static void do_watch_error(struct work_struct *w)
2944 {
2945         struct linger_work *lwork = container_of(w, struct linger_work, work);
2946         struct ceph_osd_linger_request *lreq = lwork->lreq;
2947
2948         if (!linger_registered(lreq)) {
2949                 dout("%s lreq %p not registered\n", __func__, lreq);
2950                 goto out;
2951         }
2952
2953         dout("%s lreq %p err %d\n", __func__, lreq, lwork->error.err);
2954         lreq->errcb(lreq->data, lreq->linger_id, lwork->error.err);
2955
2956 out:
2957         lwork_free(lwork);
2958 }
2959
2960 static void queue_watch_error(struct ceph_osd_linger_request *lreq)
2961 {
2962         struct linger_work *lwork;
2963
2964         lwork = lwork_alloc(lreq, do_watch_error);
2965         if (!lwork) {
2966                 pr_err("failed to allocate error-lwork\n");
2967                 return;
2968         }
2969
2970         lwork->error.err = lreq->last_error;
2971         lwork_queue(lwork);
2972 }
2973
2974 static void linger_reg_commit_complete(struct ceph_osd_linger_request *lreq,
2975                                        int result)
2976 {
2977         if (!completion_done(&lreq->reg_commit_wait)) {
2978                 lreq->reg_commit_error = (result <= 0 ? result : 0);
2979                 complete_all(&lreq->reg_commit_wait);
2980         }
2981 }
2982
2983 static void linger_commit_cb(struct ceph_osd_request *req)
2984 {
2985         struct ceph_osd_linger_request *lreq = req->r_priv;
2986
2987         mutex_lock(&lreq->lock);
2988         if (req != lreq->reg_req) {
2989                 dout("%s lreq %p linger_id %llu unknown req (%p != %p)\n",
2990                      __func__, lreq, lreq->linger_id, req, lreq->reg_req);
2991                 goto out;
2992         }
2993
2994         dout("%s lreq %p linger_id %llu result %d\n", __func__, lreq,
2995              lreq->linger_id, req->r_result);
2996         linger_reg_commit_complete(lreq, req->r_result);
2997         lreq->committed = true;
2998
2999         if (!lreq->is_watch) {
3000                 struct ceph_osd_data *osd_data =
3001                     osd_req_op_data(req, 0, notify, response_data);
3002                 void *p = page_address(osd_data->pages[0]);
3003
3004                 WARN_ON(req->r_ops[0].op != CEPH_OSD_OP_NOTIFY ||
3005                         osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
3006
3007                 /* make note of the notify_id */
3008                 if (req->r_ops[0].outdata_len >= sizeof(u64)) {
3009                         lreq->notify_id = ceph_decode_64(&p);
3010                         dout("lreq %p notify_id %llu\n", lreq,
3011                              lreq->notify_id);
3012                 } else {
3013                         dout("lreq %p no notify_id\n", lreq);
3014                 }
3015         }
3016
3017 out:
3018         mutex_unlock(&lreq->lock);
3019         linger_put(lreq);
3020 }
3021
3022 static int normalize_watch_error(int err)
3023 {
3024         /*
3025          * Translate ENOENT -> ENOTCONN so that a delete->disconnection
3026          * notification and a failure to reconnect because we raced with
3027          * the delete appear the same to the user.
3028          */
3029         if (err == -ENOENT)
3030                 err = -ENOTCONN;
3031
3032         return err;
3033 }
3034
3035 static void linger_reconnect_cb(struct ceph_osd_request *req)
3036 {
3037         struct ceph_osd_linger_request *lreq = req->r_priv;
3038
3039         mutex_lock(&lreq->lock);
3040         if (req != lreq->reg_req) {
3041                 dout("%s lreq %p linger_id %llu unknown req (%p != %p)\n",
3042                      __func__, lreq, lreq->linger_id, req, lreq->reg_req);
3043                 goto out;
3044         }
3045
3046         dout("%s lreq %p linger_id %llu result %d last_error %d\n", __func__,
3047              lreq, lreq->linger_id, req->r_result, lreq->last_error);
3048         if (req->r_result < 0) {
3049                 if (!lreq->last_error) {
3050                         lreq->last_error = normalize_watch_error(req->r_result);
3051                         queue_watch_error(lreq);
3052                 }
3053         }
3054
3055 out:
3056         mutex_unlock(&lreq->lock);
3057         linger_put(lreq);
3058 }
3059
3060 static void send_linger(struct ceph_osd_linger_request *lreq)
3061 {
3062         struct ceph_osd_client *osdc = lreq->osdc;
3063         struct ceph_osd_request *req;
3064         int ret;
3065
3066         verify_osdc_wrlocked(osdc);
3067         mutex_lock(&lreq->lock);
3068         dout("%s lreq %p linger_id %llu\n", __func__, lreq, lreq->linger_id);
3069
3070         if (lreq->reg_req) {
3071                 if (lreq->reg_req->r_osd)
3072                         cancel_linger_request(lreq->reg_req);
3073                 ceph_osdc_put_request(lreq->reg_req);
3074         }
3075
3076         req = ceph_osdc_alloc_request(osdc, NULL, 1, true, GFP_NOIO);
3077         BUG_ON(!req);
3078
3079         target_copy(&req->r_t, &lreq->t);
3080         req->r_mtime = lreq->mtime;
3081
3082         if (lreq->is_watch && lreq->committed) {
3083                 osd_req_op_watch_init(req, 0, CEPH_OSD_WATCH_OP_RECONNECT,
3084                                       lreq->linger_id, ++lreq->register_gen);
3085                 dout("lreq %p reconnect register_gen %u\n", lreq,
3086                      req->r_ops[0].watch.gen);
3087                 req->r_callback = linger_reconnect_cb;
3088         } else {
3089                 if (lreq->is_watch) {
3090                         osd_req_op_watch_init(req, 0, CEPH_OSD_WATCH_OP_WATCH,
3091                                               lreq->linger_id, 0);
3092                 } else {
3093                         lreq->notify_id = 0;
3094
3095                         refcount_inc(&lreq->request_pl->refcnt);
3096                         osd_req_op_notify_init(req, 0, lreq->linger_id,
3097                                                lreq->request_pl);
3098                         ceph_osd_data_pages_init(
3099                             osd_req_op_data(req, 0, notify, response_data),
3100                             lreq->notify_id_pages, PAGE_SIZE, 0, false, false);
3101                 }
3102                 dout("lreq %p register\n", lreq);
3103                 req->r_callback = linger_commit_cb;
3104         }
3105
3106         ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
3107         BUG_ON(ret);
3108
3109         req->r_priv = linger_get(lreq);
3110         req->r_linger = true;
3111         lreq->reg_req = req;
3112         mutex_unlock(&lreq->lock);
3113
3114         submit_request(req, true);
3115 }
3116
3117 static void linger_ping_cb(struct ceph_osd_request *req)
3118 {
3119         struct ceph_osd_linger_request *lreq = req->r_priv;
3120
3121         mutex_lock(&lreq->lock);
3122         if (req != lreq->ping_req) {
3123                 dout("%s lreq %p linger_id %llu unknown req (%p != %p)\n",
3124                      __func__, lreq, lreq->linger_id, req, lreq->ping_req);
3125                 goto out;
3126         }
3127
3128         dout("%s lreq %p linger_id %llu result %d ping_sent %lu last_error %d\n",
3129              __func__, lreq, lreq->linger_id, req->r_result, lreq->ping_sent,
3130              lreq->last_error);
3131         if (lreq->register_gen == req->r_ops[0].watch.gen) {
3132                 if (!req->r_result) {
3133                         lreq->watch_valid_thru = lreq->ping_sent;
3134                 } else if (!lreq->last_error) {
3135                         lreq->last_error = normalize_watch_error(req->r_result);
3136                         queue_watch_error(lreq);
3137                 }
3138         } else {
3139                 dout("lreq %p register_gen %u ignoring old pong %u\n", lreq,
3140                      lreq->register_gen, req->r_ops[0].watch.gen);
3141         }
3142
3143 out:
3144         mutex_unlock(&lreq->lock);
3145         linger_put(lreq);
3146 }
3147
3148 static void send_linger_ping(struct ceph_osd_linger_request *lreq)
3149 {
3150         struct ceph_osd_client *osdc = lreq->osdc;
3151         struct ceph_osd_request *req;
3152         int ret;
3153
3154         if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD)) {
3155                 dout("%s PAUSERD\n", __func__);
3156                 return;
3157         }
3158
3159         lreq->ping_sent = jiffies;
3160         dout("%s lreq %p linger_id %llu ping_sent %lu register_gen %u\n",
3161              __func__, lreq, lreq->linger_id, lreq->ping_sent,
3162              lreq->register_gen);
3163
3164         if (lreq->ping_req) {
3165                 if (lreq->ping_req->r_osd)
3166                         cancel_linger_request(lreq->ping_req);
3167                 ceph_osdc_put_request(lreq->ping_req);
3168         }
3169
3170         req = ceph_osdc_alloc_request(osdc, NULL, 1, true, GFP_NOIO);
3171         BUG_ON(!req);
3172
3173         target_copy(&req->r_t, &lreq->t);
3174         osd_req_op_watch_init(req, 0, CEPH_OSD_WATCH_OP_PING, lreq->linger_id,
3175                               lreq->register_gen);
3176         req->r_callback = linger_ping_cb;
3177
3178         ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
3179         BUG_ON(ret);
3180
3181         req->r_priv = linger_get(lreq);
3182         req->r_linger = true;
3183         lreq->ping_req = req;
3184
3185         ceph_osdc_get_request(req);
3186         account_request(req);
3187         req->r_tid = atomic64_inc_return(&osdc->last_tid);
3188         link_request(lreq->osd, req);
3189         send_request(req);
3190 }
3191
3192 static void linger_submit(struct ceph_osd_linger_request *lreq)
3193 {
3194         struct ceph_osd_client *osdc = lreq->osdc;
3195         struct ceph_osd *osd;
3196
3197         down_write(&osdc->lock);
3198         linger_register(lreq);
3199
3200         calc_target(osdc, &lreq->t, false);
3201         osd = lookup_create_osd(osdc, lreq->t.osd, true);
3202         link_linger(osd, lreq);
3203
3204         send_linger(lreq);
3205         up_write(&osdc->lock);
3206 }
3207
3208 static void cancel_linger_map_check(struct ceph_osd_linger_request *lreq)
3209 {
3210         struct ceph_osd_client *osdc = lreq->osdc;
3211         struct ceph_osd_linger_request *lookup_lreq;
3212
3213         verify_osdc_wrlocked(osdc);
3214
3215         lookup_lreq = lookup_linger_mc(&osdc->linger_map_checks,
3216                                        lreq->linger_id);
3217         if (!lookup_lreq)
3218                 return;
3219
3220         WARN_ON(lookup_lreq != lreq);
3221         erase_linger_mc(&osdc->linger_map_checks, lreq);
3222         linger_put(lreq);
3223 }
3224
3225 /*
3226  * @lreq has to be both registered and linked.
3227  */
3228 static void __linger_cancel(struct ceph_osd_linger_request *lreq)
3229 {
3230         if (lreq->ping_req && lreq->ping_req->r_osd)
3231                 cancel_linger_request(lreq->ping_req);
3232         if (lreq->reg_req && lreq->reg_req->r_osd)
3233                 cancel_linger_request(lreq->reg_req);
3234         cancel_linger_map_check(lreq);
3235         unlink_linger(lreq->osd, lreq);
3236         linger_unregister(lreq);
3237 }
3238
3239 static void linger_cancel(struct ceph_osd_linger_request *lreq)
3240 {
3241         struct ceph_osd_client *osdc = lreq->osdc;
3242
3243         down_write(&osdc->lock);
3244         if (__linger_registered(lreq))
3245                 __linger_cancel(lreq);
3246         up_write(&osdc->lock);
3247 }
3248
3249 static void send_linger_map_check(struct ceph_osd_linger_request *lreq);
3250
3251 static void check_linger_pool_dne(struct ceph_osd_linger_request *lreq)
3252 {
3253         struct ceph_osd_client *osdc = lreq->osdc;
3254         struct ceph_osdmap *map = osdc->osdmap;
3255
3256         verify_osdc_wrlocked(osdc);
3257         WARN_ON(!map->epoch);
3258
3259         if (lreq->register_gen) {
3260                 lreq->map_dne_bound = map->epoch;
3261                 dout("%s lreq %p linger_id %llu pool disappeared\n", __func__,
3262                      lreq, lreq->linger_id);
3263         } else {
3264                 dout("%s lreq %p linger_id %llu map_dne_bound %u have %u\n",
3265                      __func__, lreq, lreq->linger_id, lreq->map_dne_bound,
3266                      map->epoch);
3267         }
3268
3269         if (lreq->map_dne_bound) {
3270                 if (map->epoch >= lreq->map_dne_bound) {
3271                         /* we had a new enough map */
3272                         pr_info("linger_id %llu pool does not exist\n",
3273                                 lreq->linger_id);
3274                         linger_reg_commit_complete(lreq, -ENOENT);
3275                         __linger_cancel(lreq);
3276                 }
3277         } else {
3278                 send_linger_map_check(lreq);
3279         }
3280 }
3281
3282 static void linger_map_check_cb(struct ceph_mon_generic_request *greq)
3283 {
3284         struct ceph_osd_client *osdc = &greq->monc->client->osdc;
3285         struct ceph_osd_linger_request *lreq;
3286         u64 linger_id = greq->private_data;
3287
3288         WARN_ON(greq->result || !greq->u.newest);
3289
3290         down_write(&osdc->lock);
3291         lreq = lookup_linger_mc(&osdc->linger_map_checks, linger_id);
3292         if (!lreq) {
3293                 dout("%s linger_id %llu dne\n", __func__, linger_id);
3294                 goto out_unlock;
3295         }
3296
3297         dout("%s lreq %p linger_id %llu map_dne_bound %u newest %llu\n",
3298              __func__, lreq, lreq->linger_id, lreq->map_dne_bound,
3299              greq->u.newest);
3300         if (!lreq->map_dne_bound)
3301                 lreq->map_dne_bound = greq->u.newest;
3302         erase_linger_mc(&osdc->linger_map_checks, lreq);
3303         check_linger_pool_dne(lreq);
3304
3305         linger_put(lreq);
3306 out_unlock:
3307         up_write(&osdc->lock);
3308 }
3309
3310 static void send_linger_map_check(struct ceph_osd_linger_request *lreq)
3311 {
3312         struct ceph_osd_client *osdc = lreq->osdc;
3313         struct ceph_osd_linger_request *lookup_lreq;
3314         int ret;
3315
3316         verify_osdc_wrlocked(osdc);
3317
3318         lookup_lreq = lookup_linger_mc(&osdc->linger_map_checks,
3319                                        lreq->linger_id);
3320         if (lookup_lreq) {
3321                 WARN_ON(lookup_lreq != lreq);
3322                 return;
3323         }
3324
3325         linger_get(lreq);
3326         insert_linger_mc(&osdc->linger_map_checks, lreq);
3327         ret = ceph_monc_get_version_async(&osdc->client->monc, "osdmap",
3328                                           linger_map_check_cb, lreq->linger_id);
3329         WARN_ON(ret);
3330 }
3331
3332 static int linger_reg_commit_wait(struct ceph_osd_linger_request *lreq)
3333 {
3334         int ret;
3335
3336         dout("%s lreq %p linger_id %llu\n", __func__, lreq, lreq->linger_id);
3337         ret = wait_for_completion_killable(&lreq->reg_commit_wait);
3338         return ret ?: lreq->reg_commit_error;
3339 }
3340
3341 static int linger_notify_finish_wait(struct ceph_osd_linger_request *lreq,
3342                                      unsigned long timeout)
3343 {
3344         long left;
3345
3346         dout("%s lreq %p linger_id %llu\n", __func__, lreq, lreq->linger_id);
3347         left = wait_for_completion_killable_timeout(&lreq->notify_finish_wait,
3348                                                 ceph_timeout_jiffies(timeout));
3349         if (left <= 0)
3350                 left = left ?: -ETIMEDOUT;
3351         else
3352                 left = lreq->notify_finish_error; /* completed */
3353
3354         return left;
3355 }
3356
3357 /*
3358  * Timeout callback, called every N seconds.  When 1 or more OSD
3359  * requests has been active for more than N seconds, we send a keepalive
3360  * (tag + timestamp) to its OSD to ensure any communications channel
3361  * reset is detected.
3362  */
3363 static void handle_timeout(struct work_struct *work)
3364 {
3365         struct ceph_osd_client *osdc =
3366                 container_of(work, struct ceph_osd_client, timeout_work.work);
3367         struct ceph_options *opts = osdc->client->options;
3368         unsigned long cutoff = jiffies - opts->osd_keepalive_timeout;
3369         unsigned long expiry_cutoff = jiffies - opts->osd_request_timeout;
3370         LIST_HEAD(slow_osds);
3371         struct rb_node *n, *p;
3372
3373         dout("%s osdc %p\n", __func__, osdc);
3374         down_write(&osdc->lock);
3375
3376         /*
3377          * ping osds that are a bit slow.  this ensures that if there
3378          * is a break in the TCP connection we will notice, and reopen
3379          * a connection with that osd (from the fault callback).
3380          */
3381         for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
3382                 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
3383                 bool found = false;
3384
3385                 for (p = rb_first(&osd->o_requests); p; ) {
3386                         struct ceph_osd_request *req =
3387                             rb_entry(p, struct ceph_osd_request, r_node);
3388
3389                         p = rb_next(p); /* abort_request() */
3390
3391                         if (time_before(req->r_stamp, cutoff)) {
3392                                 dout(" req %p tid %llu on osd%d is laggy\n",
3393                                      req, req->r_tid, osd->o_osd);
3394                                 found = true;
3395                         }
3396                         if (opts->osd_request_timeout &&
3397                             time_before(req->r_start_stamp, expiry_cutoff)) {
3398                                 pr_err_ratelimited("tid %llu on osd%d timeout\n",
3399                                        req->r_tid, osd->o_osd);
3400                                 abort_request(req, -ETIMEDOUT);
3401                         }
3402                 }
3403                 for (p = rb_first(&osd->o_linger_requests); p; p = rb_next(p)) {
3404                         struct ceph_osd_linger_request *lreq =
3405                             rb_entry(p, struct ceph_osd_linger_request, node);
3406
3407                         dout(" lreq %p linger_id %llu is served by osd%d\n",
3408                              lreq, lreq->linger_id, osd->o_osd);
3409                         found = true;
3410
3411                         mutex_lock(&lreq->lock);
3412                         if (lreq->is_watch && lreq->committed && !lreq->last_error)
3413                                 send_linger_ping(lreq);
3414                         mutex_unlock(&lreq->lock);
3415                 }
3416
3417                 if (found)
3418                         list_move_tail(&osd->o_keepalive_item, &slow_osds);
3419         }
3420
3421         if (opts->osd_request_timeout) {
3422                 for (p = rb_first(&osdc->homeless_osd.o_requests); p; ) {
3423                         struct ceph_osd_request *req =
3424                             rb_entry(p, struct ceph_osd_request, r_node);
3425
3426                         p = rb_next(p); /* abort_request() */
3427
3428                         if (time_before(req->r_start_stamp, expiry_cutoff)) {
3429                                 pr_err_ratelimited("tid %llu on osd%d timeout\n",
3430                                        req->r_tid, osdc->homeless_osd.o_osd);
3431                                 abort_request(req, -ETIMEDOUT);
3432                         }
3433                 }
3434         }
3435
3436         if (atomic_read(&osdc->num_homeless) || !list_empty(&slow_osds))
3437                 maybe_request_map(osdc);
3438
3439         while (!list_empty(&slow_osds)) {
3440                 struct ceph_osd *osd = list_first_entry(&slow_osds,
3441                                                         struct ceph_osd,
3442                                                         o_keepalive_item);
3443                 list_del_init(&osd->o_keepalive_item);
3444                 ceph_con_keepalive(&osd->o_con);
3445         }
3446
3447         up_write(&osdc->lock);
3448         schedule_delayed_work(&osdc->timeout_work,
3449                               osdc->client->options->osd_keepalive_timeout);
3450 }
3451
3452 static void handle_osds_timeout(struct work_struct *work)
3453 {
3454         struct ceph_osd_client *osdc =
3455                 container_of(work, struct ceph_osd_client,
3456                              osds_timeout_work.work);
3457         unsigned long delay = osdc->client->options->osd_idle_ttl / 4;
3458         struct ceph_osd *osd, *nosd;
3459
3460         dout("%s osdc %p\n", __func__, osdc);
3461         down_write(&osdc->lock);
3462         list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
3463                 if (time_before(jiffies, osd->lru_ttl))
3464                         break;
3465
3466                 WARN_ON(!RB_EMPTY_ROOT(&osd->o_requests));
3467                 WARN_ON(!RB_EMPTY_ROOT(&osd->o_linger_requests));
3468                 close_osd(osd);
3469         }
3470
3471         up_write(&osdc->lock);
3472         schedule_delayed_work(&osdc->osds_timeout_work,
3473                               round_jiffies_relative(delay));
3474 }
3475
3476 static int ceph_oloc_decode(void **p, void *end,
3477                             struct ceph_object_locator *oloc)
3478 {
3479         u8 struct_v, struct_cv;
3480         u32 len;
3481         void *struct_end;
3482         int ret = 0;
3483
3484         ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
3485         struct_v = ceph_decode_8(p);
3486         struct_cv = ceph_decode_8(p);
3487         if (struct_v < 3) {
3488                 pr_warn("got v %d < 3 cv %d of ceph_object_locator\n",
3489                         struct_v, struct_cv);
3490                 goto e_inval;
3491         }
3492         if (struct_cv > 6) {
3493                 pr_warn("got v %d cv %d > 6 of ceph_object_locator\n",
3494                         struct_v, struct_cv);
3495                 goto e_inval;
3496         }
3497         len = ceph_decode_32(p);
3498         ceph_decode_need(p, end, len, e_inval);
3499         struct_end = *p + len;
3500
3501         oloc->pool = ceph_decode_64(p);
3502         *p += 4; /* skip preferred */
3503
3504         len = ceph_decode_32(p);
3505         if (len > 0) {
3506                 pr_warn("ceph_object_locator::key is set\n");
3507                 goto e_inval;
3508         }
3509
3510         if (struct_v >= 5) {
3511                 bool changed = false;
3512
3513                 len = ceph_decode_32(p);
3514                 if (len > 0) {
3515                         ceph_decode_need(p, end, len, e_inval);
3516                         if (!oloc->pool_ns ||
3517                             ceph_compare_string(oloc->pool_ns, *p, len))
3518                                 changed = true;
3519                         *p += len;
3520                 } else {
3521                         if (oloc->pool_ns)
3522                                 changed = true;
3523                 }
3524                 if (changed) {
3525                         /* redirect changes namespace */
3526                         pr_warn("ceph_object_locator::nspace is changed\n");
3527                         goto e_inval;
3528                 }
3529         }
3530
3531         if (struct_v >= 6) {
3532                 s64 hash = ceph_decode_64(p);
3533                 if (hash != -1) {
3534                         pr_warn("ceph_object_locator::hash is set\n");
3535                         goto e_inval;
3536                 }
3537         }
3538
3539         /* skip the rest */
3540         *p = struct_end;
3541 out:
3542         return ret;
3543
3544 e_inval:
3545         ret = -EINVAL;
3546         goto out;
3547 }
3548
3549 static int ceph_redirect_decode(void **p, void *end,
3550                                 struct ceph_request_redirect *redir)
3551 {
3552         u8 struct_v, struct_cv;
3553         u32 len;
3554         void *struct_end;
3555         int ret;
3556
3557         ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
3558         struct_v = ceph_decode_8(p);
3559         struct_cv = ceph_decode_8(p);
3560         if (struct_cv > 1) {
3561                 pr_warn("got v %d cv %d > 1 of ceph_request_redirect\n",
3562                         struct_v, struct_cv);
3563                 goto e_inval;
3564         }
3565         len = ceph_decode_32(p);
3566         ceph_decode_need(p, end, len, e_inval);
3567         struct_end = *p + len;
3568
3569         ret = ceph_oloc_decode(p, end, &redir->oloc);
3570         if (ret)
3571                 goto out;
3572
3573         len = ceph_decode_32(p);
3574         if (len > 0) {
3575                 pr_warn("ceph_request_redirect::object_name is set\n");
3576                 goto e_inval;
3577         }
3578
3579         /* skip the rest */
3580         *p = struct_end;
3581 out:
3582         return ret;
3583
3584 e_inval:
3585         ret = -EINVAL;
3586         goto out;
3587 }
3588
3589 struct MOSDOpReply {
3590         struct ceph_pg pgid;
3591         u64 flags;
3592         int result;
3593         u32 epoch;
3594         int num_ops;
3595         u32 outdata_len[CEPH_OSD_MAX_OPS];
3596         s32 rval[CEPH_OSD_MAX_OPS];
3597         int retry_attempt;
3598         struct ceph_eversion replay_version;
3599         u64 user_version;
3600         struct ceph_request_redirect redirect;
3601 };
3602
3603 static int decode_MOSDOpReply(const struct ceph_msg *msg, struct MOSDOpReply *m)
3604 {
3605         void *p = msg->front.iov_base;
3606         void *const end = p + msg->front.iov_len;
3607         u16 version = le16_to_cpu(msg->hdr.version);
3608         struct ceph_eversion bad_replay_version;
3609         u8 decode_redir;
3610         u32 len;
3611         int ret;
3612         int i;
3613
3614         ceph_decode_32_safe(&p, end, len, e_inval);
3615         ceph_decode_need(&p, end, len, e_inval);
3616         p += len; /* skip oid */
3617
3618         ret = ceph_decode_pgid(&p, end, &m->pgid);
3619         if (ret)
3620                 return ret;
3621
3622         ceph_decode_64_safe(&p, end, m->flags, e_inval);
3623         ceph_decode_32_safe(&p, end, m->result, e_inval);
3624         ceph_decode_need(&p, end, sizeof(bad_replay_version), e_inval);
3625         memcpy(&bad_replay_version, p, sizeof(bad_replay_version));
3626         p += sizeof(bad_replay_version);
3627         ceph_decode_32_safe(&p, end, m->epoch, e_inval);
3628
3629         ceph_decode_32_safe(&p, end, m->num_ops, e_inval);
3630         if (m->num_ops > ARRAY_SIZE(m->outdata_len))
3631                 goto e_inval;
3632
3633         ceph_decode_need(&p, end, m->num_ops * sizeof(struct ceph_osd_op),
3634                          e_inval);
3635         for (i = 0; i < m->num_ops; i++) {
3636                 struct ceph_osd_op *op = p;
3637
3638                 m->outdata_len[i] = le32_to_cpu(op->payload_len);
3639                 p += sizeof(*op);
3640         }
3641
3642         ceph_decode_32_safe(&p, end, m->retry_attempt, e_inval);
3643         for (i = 0; i < m->num_ops; i++)
3644                 ceph_decode_32_safe(&p, end, m->rval[i], e_inval);
3645
3646         if (version >= 5) {
3647                 ceph_decode_need(&p, end, sizeof(m->replay_version), e_inval);
3648                 memcpy(&m->replay_version, p, sizeof(m->replay_version));
3649                 p += sizeof(m->replay_version);
3650                 ceph_decode_64_safe(&p, end, m->user_version, e_inval);
3651         } else {
3652                 m->replay_version = bad_replay_version; /* struct */
3653                 m->user_version = le64_to_cpu(m->replay_version.version);
3654         }
3655
3656         if (version >= 6) {
3657                 if (version >= 7)
3658                         ceph_decode_8_safe(&p, end, decode_redir, e_inval);
3659                 else
3660                         decode_redir = 1;
3661         } else {
3662                 decode_redir = 0;
3663         }
3664
3665         if (decode_redir) {
3666                 ret = ceph_redirect_decode(&p, end, &m->redirect);
3667                 if (ret)
3668                         return ret;
3669         } else {
3670                 ceph_oloc_init(&m->redirect.oloc);
3671         }
3672
3673         return 0;
3674
3675 e_inval:
3676         return -EINVAL;
3677 }
3678
3679 /*
3680  * Handle MOSDOpReply.  Set ->r_result and call the callback if it is
3681  * specified.
3682  */
3683 static void handle_reply(struct ceph_osd *osd, struct ceph_msg *msg)
3684 {
3685         struct ceph_osd_client *osdc = osd->o_osdc;
3686         struct ceph_osd_request *req;
3687         struct MOSDOpReply m;
3688         u64 tid = le64_to_cpu(msg->hdr.tid);
3689         u32 data_len = 0;
3690         int ret;
3691         int i;
3692
3693         dout("%s msg %p tid %llu\n", __func__, msg, tid);
3694
3695         down_read(&osdc->lock);
3696         if (!osd_registered(osd)) {
3697                 dout("%s osd%d unknown\n", __func__, osd->o_osd);
3698                 goto out_unlock_osdc;
3699         }
3700         WARN_ON(osd->o_osd != le64_to_cpu(msg->hdr.src.num));
3701
3702         mutex_lock(&osd->lock);
3703         req = lookup_request(&osd->o_requests, tid);
3704         if (!req) {
3705                 dout("%s osd%d tid %llu unknown\n", __func__, osd->o_osd, tid);
3706                 goto out_unlock_session;
3707         }
3708
3709         m.redirect.oloc.pool_ns = req->r_t.target_oloc.pool_ns;
3710         ret = decode_MOSDOpReply(msg, &m);
3711         m.redirect.oloc.pool_ns = NULL;
3712         if (ret) {
3713                 pr_err("failed to decode MOSDOpReply for tid %llu: %d\n",
3714                        req->r_tid, ret);
3715                 ceph_msg_dump(msg);
3716                 goto fail_request;
3717         }
3718         dout("%s req %p tid %llu flags 0x%llx pgid %llu.%x epoch %u attempt %d v %u'%llu uv %llu\n",
3719              __func__, req, req->r_tid, m.flags, m.pgid.pool, m.pgid.seed,
3720              m.epoch, m.retry_attempt, le32_to_cpu(m.replay_version.epoch),
3721              le64_to_cpu(m.replay_version.version), m.user_version);
3722
3723         if (m.retry_attempt >= 0) {
3724                 if (m.retry_attempt != req->r_attempts - 1) {
3725                         dout("req %p tid %llu retry_attempt %d != %d, ignoring\n",
3726                              req, req->r_tid, m.retry_attempt,
3727                              req->r_attempts - 1);
3728                         goto out_unlock_session;
3729                 }
3730         } else {
3731                 WARN_ON(1); /* MOSDOpReply v4 is assumed */
3732         }
3733
3734         if (!ceph_oloc_empty(&m.redirect.oloc)) {
3735                 dout("req %p tid %llu redirect pool %lld\n", req, req->r_tid,
3736                      m.redirect.oloc.pool);
3737                 unlink_request(osd, req);
3738                 mutex_unlock(&osd->lock);
3739
3740                 /*
3741                  * Not ceph_oloc_copy() - changing pool_ns is not
3742                  * supported.
3743                  */
3744                 req->r_t.target_oloc.pool = m.redirect.oloc.pool;
3745                 req->r_flags |= CEPH_OSD_FLAG_REDIRECTED |
3746                                 CEPH_OSD_FLAG_IGNORE_OVERLAY |
3747                                 CEPH_OSD_FLAG_IGNORE_CACHE;
3748                 req->r_tid = 0;
3749                 __submit_request(req, false);
3750                 goto out_unlock_osdc;
3751         }
3752
3753         if (m.result == -EAGAIN) {
3754                 dout("req %p tid %llu EAGAIN\n", req, req->r_tid);
3755                 unlink_request(osd, req);
3756                 mutex_unlock(&osd->lock);
3757
3758                 /*
3759                  * The object is missing on the replica or not (yet)
3760                  * readable.  Clear pgid to force a resend to the primary
3761                  * via legacy_change.
3762                  */
3763                 req->r_t.pgid.pool = 0;
3764                 req->r_t.pgid.seed = 0;
3765                 WARN_ON(!req->r_t.used_replica);
3766                 req->r_flags &= ~(CEPH_OSD_FLAG_BALANCE_READS |
3767                                   CEPH_OSD_FLAG_LOCALIZE_READS);
3768                 req->r_tid = 0;
3769                 __submit_request(req, false);
3770                 goto out_unlock_osdc;
3771         }
3772
3773         if (m.num_ops != req->r_num_ops) {
3774                 pr_err("num_ops %d != %d for tid %llu\n", m.num_ops,
3775                        req->r_num_ops, req->r_tid);
3776                 goto fail_request;
3777         }
3778         for (i = 0; i < req->r_num_ops; i++) {
3779                 dout(" req %p tid %llu op %d rval %d len %u\n", req,
3780                      req->r_tid, i, m.rval[i], m.outdata_len[i]);
3781                 req->r_ops[i].rval = m.rval[i];
3782                 req->r_ops[i].outdata_len = m.outdata_len[i];
3783                 data_len += m.outdata_len[i];
3784         }
3785         if (data_len != le32_to_cpu(msg->hdr.data_len)) {
3786                 pr_err("sum of lens %u != %u for tid %llu\n", data_len,
3787                        le32_to_cpu(msg->hdr.data_len), req->r_tid);
3788                 goto fail_request;
3789         }
3790         dout("%s req %p tid %llu result %d data_len %u\n", __func__,
3791              req, req->r_tid, m.result, data_len);
3792
3793         /*
3794          * Since we only ever request ONDISK, we should only ever get
3795          * one (type of) reply back.
3796          */
3797         WARN_ON(!(m.flags & CEPH_OSD_FLAG_ONDISK));
3798         req->r_result = m.result ?: data_len;
3799         finish_request(req);
3800         mutex_unlock(&osd->lock);
3801         up_read(&osdc->lock);
3802
3803         __complete_request(req);
3804         return;
3805
3806 fail_request:
3807         complete_request(req, -EIO);
3808 out_unlock_session:
3809         mutex_unlock(&osd->lock);
3810 out_unlock_osdc:
3811         up_read(&osdc->lock);
3812 }
3813
3814 static void set_pool_was_full(struct ceph_osd_client *osdc)
3815 {
3816         struct rb_node *n;
3817
3818         for (n = rb_first(&osdc->osdmap->pg_pools); n; n = rb_next(n)) {
3819                 struct ceph_pg_pool_info *pi =
3820                     rb_entry(n, struct ceph_pg_pool_info, node);
3821
3822                 pi->was_full = __pool_full(pi);
3823         }
3824 }
3825
3826 static bool pool_cleared_full(struct ceph_osd_client *osdc, s64 pool_id)
3827 {
3828         struct ceph_pg_pool_info *pi;
3829
3830         pi = ceph_pg_pool_by_id(osdc->osdmap, pool_id);
3831         if (!pi)
3832                 return false;
3833
3834         return pi->was_full && !__pool_full(pi);
3835 }
3836
3837 static enum calc_target_result
3838 recalc_linger_target(struct ceph_osd_linger_request *lreq)
3839 {
3840         struct ceph_osd_client *osdc = lreq->osdc;
3841         enum calc_target_result ct_res;
3842
3843         ct_res = calc_target(osdc, &lreq->t, true);
3844         if (ct_res == CALC_TARGET_NEED_RESEND) {
3845                 struct ceph_osd *osd;
3846
3847                 osd = lookup_create_osd(osdc, lreq->t.osd, true);
3848                 if (osd != lreq->osd) {
3849                         unlink_linger(lreq->osd, lreq);
3850                         link_linger(osd, lreq);
3851                 }
3852         }
3853
3854         return ct_res;
3855 }
3856
3857 /*
3858  * Requeue requests whose mapping to an OSD has changed.
3859  */
3860 static void scan_requests(struct ceph_osd *osd,
3861                           bool force_resend,
3862                           bool cleared_full,
3863                           bool check_pool_cleared_full,
3864                           struct rb_root *need_resend,
3865                           struct list_head *need_resend_linger)
3866 {
3867         struct ceph_osd_client *osdc = osd->o_osdc;
3868         struct rb_node *n;
3869         bool force_resend_writes;
3870
3871         for (n = rb_first(&osd->o_linger_requests); n; ) {
3872                 struct ceph_osd_linger_request *lreq =
3873                     rb_entry(n, struct ceph_osd_linger_request, node);
3874                 enum calc_target_result ct_res;
3875
3876                 n = rb_next(n); /* recalc_linger_target() */
3877
3878                 dout("%s lreq %p linger_id %llu\n", __func__, lreq,
3879                      lreq->linger_id);
3880                 ct_res = recalc_linger_target(lreq);
3881                 switch (ct_res) {
3882                 case CALC_TARGET_NO_ACTION:
3883                         force_resend_writes = cleared_full ||
3884                             (check_pool_cleared_full &&
3885                              pool_cleared_full(osdc, lreq->t.base_oloc.pool));
3886                         if (!force_resend && !force_resend_writes)
3887                                 break;
3888
3889                         fallthrough;
3890                 case CALC_TARGET_NEED_RESEND:
3891                         cancel_linger_map_check(lreq);
3892                         /*
3893                          * scan_requests() for the previous epoch(s)
3894                          * may have already added it to the list, since
3895                          * it's not unlinked here.
3896                          */
3897                         if (list_empty(&lreq->scan_item))
3898                                 list_add_tail(&lreq->scan_item, need_resend_linger);
3899                         break;
3900                 case CALC_TARGET_POOL_DNE:
3901                         list_del_init(&lreq->scan_item);
3902                         check_linger_pool_dne(lreq);
3903                         break;
3904                 }
3905         }
3906
3907         for (n = rb_first(&osd->o_requests); n; ) {
3908                 struct ceph_osd_request *req =
3909                     rb_entry(n, struct ceph_osd_request, r_node);
3910                 enum calc_target_result ct_res;
3911
3912                 n = rb_next(n); /* unlink_request(), check_pool_dne() */
3913
3914                 dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
3915                 ct_res = calc_target(osdc, &req->r_t, false);
3916                 switch (ct_res) {
3917                 case CALC_TARGET_NO_ACTION:
3918                         force_resend_writes = cleared_full ||
3919                             (check_pool_cleared_full &&
3920                              pool_cleared_full(osdc, req->r_t.base_oloc.pool));
3921                         if (!force_resend &&
3922                             (!(req->r_flags & CEPH_OSD_FLAG_WRITE) ||
3923                              !force_resend_writes))
3924                                 break;
3925
3926                         fallthrough;
3927                 case CALC_TARGET_NEED_RESEND:
3928                         cancel_map_check(req);
3929                         unlink_request(osd, req);
3930                         insert_request(need_resend, req);
3931                         break;
3932                 case CALC_TARGET_POOL_DNE:
3933                         check_pool_dne(req);
3934                         break;
3935                 }
3936         }
3937 }
3938
3939 static int handle_one_map(struct ceph_osd_client *osdc,
3940                           void *p, void *end, bool incremental,
3941                           struct rb_root *need_resend,
3942                           struct list_head *need_resend_linger)
3943 {
3944         struct ceph_osdmap *newmap;
3945         struct rb_node *n;
3946         bool skipped_map = false;
3947         bool was_full;
3948
3949         was_full = ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL);
3950         set_pool_was_full(osdc);
3951
3952         if (incremental)
3953                 newmap = osdmap_apply_incremental(&p, end,
3954                                                   ceph_msgr2(osdc->client),
3955                                                   osdc->osdmap);
3956         else
3957                 newmap = ceph_osdmap_decode(&p, end, ceph_msgr2(osdc->client));
3958         if (IS_ERR(newmap))
3959                 return PTR_ERR(newmap);
3960
3961         if (newmap != osdc->osdmap) {
3962                 /*
3963                  * Preserve ->was_full before destroying the old map.
3964                  * For pools that weren't in the old map, ->was_full
3965                  * should be false.
3966                  */
3967                 for (n = rb_first(&newmap->pg_pools); n; n = rb_next(n)) {
3968                         struct ceph_pg_pool_info *pi =
3969                             rb_entry(n, struct ceph_pg_pool_info, node);
3970                         struct ceph_pg_pool_info *old_pi;
3971
3972                         old_pi = ceph_pg_pool_by_id(osdc->osdmap, pi->id);
3973                         if (old_pi)
3974                                 pi->was_full = old_pi->was_full;
3975                         else
3976                                 WARN_ON(pi->was_full);
3977                 }
3978
3979                 if (osdc->osdmap->epoch &&
3980                     osdc->osdmap->epoch + 1 < newmap->epoch) {
3981                         WARN_ON(incremental);
3982                         skipped_map = true;
3983                 }
3984
3985                 ceph_osdmap_destroy(osdc->osdmap);
3986                 osdc->osdmap = newmap;
3987         }
3988
3989         was_full &= !ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL);
3990         scan_requests(&osdc->homeless_osd, skipped_map, was_full, true,
3991                       need_resend, need_resend_linger);
3992
3993         for (n = rb_first(&osdc->osds); n; ) {
3994                 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
3995
3996                 n = rb_next(n); /* close_osd() */
3997
3998                 scan_requests(osd, skipped_map, was_full, true, need_resend,
3999                               need_resend_linger);
4000                 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
4001                     memcmp(&osd->o_con.peer_addr,
4002                            ceph_osd_addr(osdc->osdmap, osd->o_osd),
4003                            sizeof(struct ceph_entity_addr)))
4004                         close_osd(osd);
4005         }
4006
4007         return 0;
4008 }
4009
4010 static void kick_requests(struct ceph_osd_client *osdc,
4011                           struct rb_root *need_resend,
4012                           struct list_head *need_resend_linger)
4013 {
4014         struct ceph_osd_linger_request *lreq, *nlreq;
4015         enum calc_target_result ct_res;
4016         struct rb_node *n;
4017
4018         /* make sure need_resend targets reflect latest map */
4019         for (n = rb_first(need_resend); n; ) {
4020                 struct ceph_osd_request *req =
4021                     rb_entry(n, struct ceph_osd_request, r_node);
4022
4023                 n = rb_next(n);
4024
4025                 if (req->r_t.epoch < osdc->osdmap->epoch) {
4026                         ct_res = calc_target(osdc, &req->r_t, false);
4027                         if (ct_res == CALC_TARGET_POOL_DNE) {
4028                                 erase_request(need_resend, req);
4029                                 check_pool_dne(req);
4030                         }
4031                 }
4032         }
4033
4034         for (n = rb_first(need_resend); n; ) {
4035                 struct ceph_osd_request *req =
4036                     rb_entry(n, struct ceph_osd_request, r_node);
4037                 struct ceph_osd *osd;
4038
4039                 n = rb_next(n);
4040                 erase_request(need_resend, req); /* before link_request() */
4041
4042                 osd = lookup_create_osd(osdc, req->r_t.osd, true);
4043                 link_request(osd, req);
4044                 if (!req->r_linger) {
4045                         if (!osd_homeless(osd) && !req->r_t.paused)
4046                                 send_request(req);
4047                 } else {
4048                         cancel_linger_request(req);
4049                 }
4050         }
4051
4052         list_for_each_entry_safe(lreq, nlreq, need_resend_linger, scan_item) {
4053                 if (!osd_homeless(lreq->osd))
4054                         send_linger(lreq);
4055
4056                 list_del_init(&lreq->scan_item);
4057         }
4058 }
4059
4060 /*
4061  * Process updated osd map.
4062  *
4063  * The message contains any number of incremental and full maps, normally
4064  * indicating some sort of topology change in the cluster.  Kick requests
4065  * off to different OSDs as needed.
4066  */
4067 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
4068 {
4069         void *p = msg->front.iov_base;
4070         void *const end = p + msg->front.iov_len;
4071         u32 nr_maps, maplen;
4072         u32 epoch;
4073         struct ceph_fsid fsid;
4074         struct rb_root need_resend = RB_ROOT;
4075         LIST_HEAD(need_resend_linger);
4076         bool handled_incremental = false;
4077         bool was_pauserd, was_pausewr;
4078         bool pauserd, pausewr;
4079         int err;
4080
4081         dout("%s have %u\n", __func__, osdc->osdmap->epoch);
4082         down_write(&osdc->lock);
4083
4084         /* verify fsid */
4085         ceph_decode_need(&p, end, sizeof(fsid), bad);
4086         ceph_decode_copy(&p, &fsid, sizeof(fsid));
4087         if (ceph_check_fsid(osdc->client, &fsid) < 0)
4088                 goto bad;
4089
4090         was_pauserd = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD);
4091         was_pausewr = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR) ||
4092                       ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
4093                       have_pool_full(osdc);
4094
4095         /* incremental maps */
4096         ceph_decode_32_safe(&p, end, nr_maps, bad);
4097         dout(" %d inc maps\n", nr_maps);
4098         while (nr_maps > 0) {
4099                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
4100                 epoch = ceph_decode_32(&p);
4101                 maplen = ceph_decode_32(&p);
4102                 ceph_decode_need(&p, end, maplen, bad);
4103                 if (osdc->osdmap->epoch &&
4104                     osdc->osdmap->epoch + 1 == epoch) {
4105                         dout("applying incremental map %u len %d\n",
4106                              epoch, maplen);
4107                         err = handle_one_map(osdc, p, p + maplen, true,
4108                                              &need_resend, &need_resend_linger);
4109                         if (err)
4110                                 goto bad;
4111                         handled_incremental = true;
4112                 } else {
4113                         dout("ignoring incremental map %u len %d\n",
4114                              epoch, maplen);
4115                 }
4116                 p += maplen;
4117                 nr_maps--;
4118         }
4119         if (handled_incremental)
4120                 goto done;
4121
4122         /* full maps */
4123         ceph_decode_32_safe(&p, end, nr_maps, bad);
4124         dout(" %d full maps\n", nr_maps);
4125         while (nr_maps) {
4126                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
4127                 epoch = ceph_decode_32(&p);
4128                 maplen = ceph_decode_32(&p);
4129                 ceph_decode_need(&p, end, maplen, bad);
4130                 if (nr_maps > 1) {
4131                         dout("skipping non-latest full map %u len %d\n",
4132                              epoch, maplen);
4133                 } else if (osdc->osdmap->epoch >= epoch) {
4134                         dout("skipping full map %u len %d, "
4135                              "older than our %u\n", epoch, maplen,
4136                              osdc->osdmap->epoch);
4137                 } else {
4138                         dout("taking full map %u len %d\n", epoch, maplen);
4139                         err = handle_one_map(osdc, p, p + maplen, false,
4140                                              &need_resend, &need_resend_linger);
4141                         if (err)
4142                                 goto bad;
4143                 }
4144                 p += maplen;
4145                 nr_maps--;
4146         }
4147
4148 done:
4149         /*
4150          * subscribe to subsequent osdmap updates if full to ensure
4151          * we find out when we are no longer full and stop returning
4152          * ENOSPC.
4153          */
4154         pauserd = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSERD);
4155         pausewr = ceph_osdmap_flag(osdc, CEPH_OSDMAP_PAUSEWR) ||
4156                   ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
4157                   have_pool_full(osdc);
4158         if (was_pauserd || was_pausewr || pauserd || pausewr ||
4159             osdc->osdmap->epoch < osdc->epoch_barrier)
4160                 maybe_request_map(osdc);
4161
4162         kick_requests(osdc, &need_resend, &need_resend_linger);
4163
4164         ceph_osdc_abort_on_full(osdc);
4165         ceph_monc_got_map(&osdc->client->monc, CEPH_SUB_OSDMAP,
4166                           osdc->osdmap->epoch);
4167         up_write(&osdc->lock);
4168         wake_up_all(&osdc->client->auth_wq);
4169         return;
4170
4171 bad:
4172         pr_err("osdc handle_map corrupt msg\n");
4173         ceph_msg_dump(msg);
4174         up_write(&osdc->lock);
4175 }
4176
4177 /*
4178  * Resubmit requests pending on the given osd.
4179  */
4180 static void kick_osd_requests(struct ceph_osd *osd)
4181 {
4182         struct rb_node *n;
4183
4184         clear_backoffs(osd);
4185
4186         for (n = rb_first(&osd->o_requests); n; ) {
4187                 struct ceph_osd_request *req =
4188                     rb_entry(n, struct ceph_osd_request, r_node);
4189
4190                 n = rb_next(n); /* cancel_linger_request() */
4191
4192                 if (!req->r_linger) {
4193                         if (!req->r_t.paused)
4194                                 send_request(req);
4195                 } else {
4196                         cancel_linger_request(req);
4197                 }
4198         }
4199         for (n = rb_first(&osd->o_linger_requests); n; n = rb_next(n)) {
4200                 struct ceph_osd_linger_request *lreq =
4201                     rb_entry(n, struct ceph_osd_linger_request, node);
4202
4203                 send_linger(lreq);
4204         }
4205 }
4206
4207 /*
4208  * If the osd connection drops, we need to resubmit all requests.
4209  */
4210 static void osd_fault(struct ceph_connection *con)
4211 {
4212         struct ceph_osd *osd = con->private;
4213         struct ceph_osd_client *osdc = osd->o_osdc;
4214
4215         dout("%s osd %p osd%d\n", __func__, osd, osd->o_osd);
4216
4217         down_write(&osdc->lock);
4218         if (!osd_registered(osd)) {
4219                 dout("%s osd%d unknown\n", __func__, osd->o_osd);
4220                 goto out_unlock;
4221         }
4222
4223         if (!reopen_osd(osd))
4224                 kick_osd_requests(osd);
4225         maybe_request_map(osdc);
4226
4227 out_unlock:
4228         up_write(&osdc->lock);
4229 }
4230
4231 struct MOSDBackoff {
4232         struct ceph_spg spgid;
4233         u32 map_epoch;
4234         u8 op;
4235         u64 id;
4236         struct ceph_hobject_id *begin;
4237         struct ceph_hobject_id *end;
4238 };
4239
4240 static int decode_MOSDBackoff(const struct ceph_msg *msg, struct MOSDBackoff *m)
4241 {
4242         void *p = msg->front.iov_base;
4243         void *const end = p + msg->front.iov_len;
4244         u8 struct_v;
4245         u32 struct_len;
4246         int ret;
4247
4248         ret = ceph_start_decoding(&p, end, 1, "spg_t", &struct_v, &struct_len);
4249         if (ret)
4250                 return ret;
4251
4252         ret = ceph_decode_pgid(&p, end, &m->spgid.pgid);
4253         if (ret)
4254                 return ret;
4255
4256         ceph_decode_8_safe(&p, end, m->spgid.shard, e_inval);
4257         ceph_decode_32_safe(&p, end, m->map_epoch, e_inval);
4258         ceph_decode_8_safe(&p, end, m->op, e_inval);
4259         ceph_decode_64_safe(&p, end, m->id, e_inval);
4260
4261         m->begin = kzalloc(sizeof(*m->begin), GFP_NOIO);
4262         if (!m->begin)
4263                 return -ENOMEM;
4264
4265         ret = decode_hoid(&p, end, m->begin);
4266         if (ret) {
4267                 free_hoid(m->begin);
4268                 return ret;
4269         }
4270
4271         m->end = kzalloc(sizeof(*m->end), GFP_NOIO);
4272         if (!m->end) {
4273                 free_hoid(m->begin);
4274                 return -ENOMEM;
4275         }
4276
4277         ret = decode_hoid(&p, end, m->end);
4278         if (ret) {
4279                 free_hoid(m->begin);
4280                 free_hoid(m->end);
4281                 return ret;
4282         }
4283
4284         return 0;
4285
4286 e_inval:
4287         return -EINVAL;
4288 }
4289
4290 static struct ceph_msg *create_backoff_message(
4291                                 const struct ceph_osd_backoff *backoff,
4292                                 u32 map_epoch)
4293 {
4294         struct ceph_msg *msg;
4295         void *p, *end;
4296         int msg_size;
4297
4298         msg_size = CEPH_ENCODING_START_BLK_LEN +
4299                         CEPH_PGID_ENCODING_LEN + 1; /* spgid */
4300         msg_size += 4 + 1 + 8; /* map_epoch, op, id */
4301         msg_size += CEPH_ENCODING_START_BLK_LEN +
4302                         hoid_encoding_size(backoff->begin);
4303         msg_size += CEPH_ENCODING_START_BLK_LEN +
4304                         hoid_encoding_size(backoff->end);
4305
4306         msg = ceph_msg_new(CEPH_MSG_OSD_BACKOFF, msg_size, GFP_NOIO, true);
4307         if (!msg)
4308                 return NULL;
4309
4310         p = msg->front.iov_base;
4311         end = p + msg->front_alloc_len;
4312
4313         encode_spgid(&p, &backoff->spgid);
4314         ceph_encode_32(&p, map_epoch);
4315         ceph_encode_8(&p, CEPH_OSD_BACKOFF_OP_ACK_BLOCK);
4316         ceph_encode_64(&p, backoff->id);
4317         encode_hoid(&p, end, backoff->begin);
4318         encode_hoid(&p, end, backoff->end);
4319         BUG_ON(p != end);
4320
4321         msg->front.iov_len = p - msg->front.iov_base;
4322         msg->hdr.version = cpu_to_le16(1); /* MOSDBackoff v1 */
4323         msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
4324
4325         return msg;
4326 }
4327
4328 static void handle_backoff_block(struct ceph_osd *osd, struct MOSDBackoff *m)
4329 {
4330         struct ceph_spg_mapping *spg;
4331         struct ceph_osd_backoff *backoff;
4332         struct ceph_msg *msg;
4333
4334         dout("%s osd%d spgid %llu.%xs%d id %llu\n", __func__, osd->o_osd,
4335              m->spgid.pgid.pool, m->spgid.pgid.seed, m->spgid.shard, m->id);
4336
4337         spg = lookup_spg_mapping(&osd->o_backoff_mappings, &m->spgid);
4338         if (!spg) {
4339                 spg = alloc_spg_mapping();
4340                 if (!spg) {
4341                         pr_err("%s failed to allocate spg\n", __func__);
4342                         return;
4343                 }
4344                 spg->spgid = m->spgid; /* struct */
4345                 insert_spg_mapping(&osd->o_backoff_mappings, spg);
4346         }
4347
4348         backoff = alloc_backoff();
4349         if (!backoff) {
4350                 pr_err("%s failed to allocate backoff\n", __func__);
4351                 return;
4352         }
4353         backoff->spgid = m->spgid; /* struct */
4354         backoff->id = m->id;
4355         backoff->begin = m->begin;
4356         m->begin = NULL; /* backoff now owns this */
4357         backoff->end = m->end;
4358         m->end = NULL;   /* ditto */
4359
4360         insert_backoff(&spg->backoffs, backoff);
4361         insert_backoff_by_id(&osd->o_backoffs_by_id, backoff);
4362
4363         /*
4364          * Ack with original backoff's epoch so that the OSD can
4365          * discard this if there was a PG split.
4366          */
4367         msg = create_backoff_message(backoff, m->map_epoch);
4368         if (!msg) {
4369                 pr_err("%s failed to allocate msg\n", __func__);
4370                 return;
4371         }
4372         ceph_con_send(&osd->o_con, msg);
4373 }
4374
4375 static bool target_contained_by(const struct ceph_osd_request_target *t,
4376                                 const struct ceph_hobject_id *begin,
4377                                 const struct ceph_hobject_id *end)
4378 {
4379         struct ceph_hobject_id hoid;
4380         int cmp;
4381
4382         hoid_fill_from_target(&hoid, t);
4383         cmp = hoid_compare(&hoid, begin);
4384         return !cmp || (cmp > 0 && hoid_compare(&hoid, end) < 0);
4385 }
4386
4387 static void handle_backoff_unblock(struct ceph_osd *osd,
4388                                    const struct MOSDBackoff *m)
4389 {
4390         struct ceph_spg_mapping *spg;
4391         struct ceph_osd_backoff *backoff;
4392         struct rb_node *n;
4393
4394         dout("%s osd%d spgid %llu.%xs%d id %llu\n", __func__, osd->o_osd,
4395              m->spgid.pgid.pool, m->spgid.pgid.seed, m->spgid.shard, m->id);
4396
4397         backoff = lookup_backoff_by_id(&osd->o_backoffs_by_id, m->id);
4398         if (!backoff) {
4399                 pr_err("%s osd%d spgid %llu.%xs%d id %llu backoff dne\n",
4400                        __func__, osd->o_osd, m->spgid.pgid.pool,
4401                        m->spgid.pgid.seed, m->spgid.shard, m->id);
4402                 return;
4403         }
4404
4405         if (hoid_compare(backoff->begin, m->begin) &&
4406             hoid_compare(backoff->end, m->end)) {
4407                 pr_err("%s osd%d spgid %llu.%xs%d id %llu bad range?\n",
4408                        __func__, osd->o_osd, m->spgid.pgid.pool,
4409                        m->spgid.pgid.seed, m->spgid.shard, m->id);
4410                 /* unblock it anyway... */
4411         }
4412
4413         spg = lookup_spg_mapping(&osd->o_backoff_mappings, &backoff->spgid);
4414         BUG_ON(!spg);
4415
4416         erase_backoff(&spg->backoffs, backoff);
4417         erase_backoff_by_id(&osd->o_backoffs_by_id, backoff);
4418         free_backoff(backoff);
4419
4420         if (RB_EMPTY_ROOT(&spg->backoffs)) {
4421                 erase_spg_mapping(&osd->o_backoff_mappings, spg);
4422                 free_spg_mapping(spg);
4423         }
4424
4425         for (n = rb_first(&osd->o_requests); n; n = rb_next(n)) {
4426                 struct ceph_osd_request *req =
4427                     rb_entry(n, struct ceph_osd_request, r_node);
4428
4429                 if (!ceph_spg_compare(&req->r_t.spgid, &m->spgid)) {
4430                         /*
4431                          * Match against @m, not @backoff -- the PG may
4432                          * have split on the OSD.
4433                          */
4434                         if (target_contained_by(&req->r_t, m->begin, m->end)) {
4435                                 /*
4436                                  * If no other installed backoff applies,
4437                                  * resend.
4438                                  */
4439                                 send_request(req);
4440                         }
4441                 }
4442         }
4443 }
4444
4445 static void handle_backoff(struct ceph_osd *osd, struct ceph_msg *msg)
4446 {
4447         struct ceph_osd_client *osdc = osd->o_osdc;
4448         struct MOSDBackoff m;
4449         int ret;
4450
4451         down_read(&osdc->lock);
4452         if (!osd_registered(osd)) {
4453                 dout("%s osd%d unknown\n", __func__, osd->o_osd);
4454                 up_read(&osdc->lock);
4455                 return;
4456         }
4457         WARN_ON(osd->o_osd != le64_to_cpu(msg->hdr.src.num));
4458
4459         mutex_lock(&osd->lock);
4460         ret = decode_MOSDBackoff(msg, &m);
4461         if (ret) {
4462                 pr_err("failed to decode MOSDBackoff: %d\n", ret);
4463                 ceph_msg_dump(msg);
4464                 goto out_unlock;
4465         }
4466
4467         switch (m.op) {
4468         case CEPH_OSD_BACKOFF_OP_BLOCK:
4469                 handle_backoff_block(osd, &m);
4470                 break;
4471         case CEPH_OSD_BACKOFF_OP_UNBLOCK:
4472                 handle_backoff_unblock(osd, &m);
4473                 break;
4474         default:
4475                 pr_err("%s osd%d unknown op %d\n", __func__, osd->o_osd, m.op);
4476         }
4477
4478         free_hoid(m.begin);
4479         free_hoid(m.end);
4480
4481 out_unlock:
4482         mutex_unlock(&osd->lock);
4483         up_read(&osdc->lock);
4484 }
4485
4486 /*
4487  * Process osd watch notifications
4488  */
4489 static void handle_watch_notify(struct ceph_osd_client *osdc,
4490                                 struct ceph_msg *msg)
4491 {
4492         void *p = msg->front.iov_base;
4493         void *const end = p + msg->front.iov_len;
4494         struct ceph_osd_linger_request *lreq;
4495         struct linger_work *lwork;
4496         u8 proto_ver, opcode;
4497         u64 cookie, notify_id;
4498         u64 notifier_id = 0;
4499         s32 return_code = 0;
4500         void *payload = NULL;
4501         u32 payload_len = 0;
4502
4503         ceph_decode_8_safe(&p, end, proto_ver, bad);
4504         ceph_decode_8_safe(&p, end, opcode, bad);
4505         ceph_decode_64_safe(&p, end, cookie, bad);
4506         p += 8; /* skip ver */
4507         ceph_decode_64_safe(&p, end, notify_id, bad);
4508
4509         if (proto_ver >= 1) {
4510                 ceph_decode_32_safe(&p, end, payload_len, bad);
4511                 ceph_decode_need(&p, end, payload_len, bad);
4512                 payload = p;
4513                 p += payload_len;
4514         }
4515
4516         if (le16_to_cpu(msg->hdr.version) >= 2)
4517                 ceph_decode_32_safe(&p, end, return_code, bad);
4518
4519         if (le16_to_cpu(msg->hdr.version) >= 3)
4520                 ceph_decode_64_safe(&p, end, notifier_id, bad);
4521
4522         down_read(&osdc->lock);
4523         lreq = lookup_linger_osdc(&osdc->linger_requests, cookie);
4524         if (!lreq) {
4525                 dout("%s opcode %d cookie %llu dne\n", __func__, opcode,
4526                      cookie);
4527                 goto out_unlock_osdc;
4528         }
4529
4530         mutex_lock(&lreq->lock);
4531         dout("%s opcode %d cookie %llu lreq %p is_watch %d\n", __func__,
4532              opcode, cookie, lreq, lreq->is_watch);
4533         if (opcode == CEPH_WATCH_EVENT_DISCONNECT) {
4534                 if (!lreq->last_error) {
4535                         lreq->last_error = -ENOTCONN;
4536                         queue_watch_error(lreq);
4537                 }
4538         } else if (!lreq->is_watch) {
4539                 /* CEPH_WATCH_EVENT_NOTIFY_COMPLETE */
4540                 if (lreq->notify_id && lreq->notify_id != notify_id) {
4541                         dout("lreq %p notify_id %llu != %llu, ignoring\n", lreq,
4542                              lreq->notify_id, notify_id);
4543                 } else if (!completion_done(&lreq->notify_finish_wait)) {
4544                         struct ceph_msg_data *data =
4545                             msg->num_data_items ? &msg->data[0] : NULL;
4546
4547                         if (data) {
4548                                 if (lreq->preply_pages) {
4549                                         WARN_ON(data->type !=
4550                                                         CEPH_MSG_DATA_PAGES);
4551                                         *lreq->preply_pages = data->pages;
4552                                         *lreq->preply_len = data->length;
4553                                         data->own_pages = false;
4554                                 }
4555                         }
4556                         lreq->notify_finish_error = return_code;
4557                         complete_all(&lreq->notify_finish_wait);
4558                 }
4559         } else {
4560                 /* CEPH_WATCH_EVENT_NOTIFY */
4561                 lwork = lwork_alloc(lreq, do_watch_notify);
4562                 if (!lwork) {
4563                         pr_err("failed to allocate notify-lwork\n");
4564                         goto out_unlock_lreq;
4565                 }
4566
4567                 lwork->notify.notify_id = notify_id;
4568                 lwork->notify.notifier_id = notifier_id;
4569                 lwork->notify.payload = payload;
4570                 lwork->notify.payload_len = payload_len;
4571                 lwork->notify.msg = ceph_msg_get(msg);
4572                 lwork_queue(lwork);
4573         }
4574
4575 out_unlock_lreq:
4576         mutex_unlock(&lreq->lock);
4577 out_unlock_osdc:
4578         up_read(&osdc->lock);
4579         return;
4580
4581 bad:
4582         pr_err("osdc handle_watch_notify corrupt msg\n");
4583 }
4584
4585 /*
4586  * Register request, send initial attempt.
4587  */
4588 void ceph_osdc_start_request(struct ceph_osd_client *osdc,
4589                              struct ceph_osd_request *req)
4590 {
4591         down_read(&osdc->lock);
4592         submit_request(req, false);
4593         up_read(&osdc->lock);
4594 }
4595 EXPORT_SYMBOL(ceph_osdc_start_request);
4596
4597 /*
4598  * Unregister request.  If @req was registered, it isn't completed:
4599  * r_result isn't set and __complete_request() isn't invoked.
4600  *
4601  * If @req wasn't registered, this call may have raced with
4602  * handle_reply(), in which case r_result would already be set and
4603  * __complete_request() would be getting invoked, possibly even
4604  * concurrently with this call.
4605  */
4606 void ceph_osdc_cancel_request(struct ceph_osd_request *req)
4607 {
4608         struct ceph_osd_client *osdc = req->r_osdc;
4609
4610         down_write(&osdc->lock);
4611         if (req->r_osd)
4612                 cancel_request(req);
4613         up_write(&osdc->lock);
4614 }
4615 EXPORT_SYMBOL(ceph_osdc_cancel_request);
4616
4617 /*
4618  * @timeout: in jiffies, 0 means "wait forever"
4619  */
4620 static int wait_request_timeout(struct ceph_osd_request *req,
4621                                 unsigned long timeout)
4622 {
4623         long left;
4624
4625         dout("%s req %p tid %llu\n", __func__, req, req->r_tid);
4626         left = wait_for_completion_killable_timeout(&req->r_completion,
4627                                                 ceph_timeout_jiffies(timeout));
4628         if (left <= 0) {
4629                 left = left ?: -ETIMEDOUT;
4630                 ceph_osdc_cancel_request(req);
4631         } else {
4632                 left = req->r_result; /* completed */
4633         }
4634
4635         return left;
4636 }
4637
4638 /*
4639  * wait for a request to complete
4640  */
4641 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
4642                            struct ceph_osd_request *req)
4643 {
4644         return wait_request_timeout(req, 0);
4645 }
4646 EXPORT_SYMBOL(ceph_osdc_wait_request);
4647
4648 /*
4649  * sync - wait for all in-flight requests to flush.  avoid starvation.
4650  */
4651 void ceph_osdc_sync(struct ceph_osd_client *osdc)
4652 {
4653         struct rb_node *n, *p;
4654         u64 last_tid = atomic64_read(&osdc->last_tid);
4655
4656 again:
4657         down_read(&osdc->lock);
4658         for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
4659                 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
4660
4661                 mutex_lock(&osd->lock);
4662                 for (p = rb_first(&osd->o_requests); p; p = rb_next(p)) {
4663                         struct ceph_osd_request *req =
4664                             rb_entry(p, struct ceph_osd_request, r_node);
4665
4666                         if (req->r_tid > last_tid)
4667                                 break;
4668
4669                         if (!(req->r_flags & CEPH_OSD_FLAG_WRITE))
4670                                 continue;
4671
4672                         ceph_osdc_get_request(req);
4673                         mutex_unlock(&osd->lock);
4674                         up_read(&osdc->lock);
4675                         dout("%s waiting on req %p tid %llu last_tid %llu\n",
4676                              __func__, req, req->r_tid, last_tid);
4677                         wait_for_completion(&req->r_completion);
4678                         ceph_osdc_put_request(req);
4679                         goto again;
4680                 }
4681
4682                 mutex_unlock(&osd->lock);
4683         }
4684
4685         up_read(&osdc->lock);
4686         dout("%s done last_tid %llu\n", __func__, last_tid);
4687 }
4688 EXPORT_SYMBOL(ceph_osdc_sync);
4689
4690 /*
4691  * Returns a handle, caller owns a ref.
4692  */
4693 struct ceph_osd_linger_request *
4694 ceph_osdc_watch(struct ceph_osd_client *osdc,
4695                 struct ceph_object_id *oid,
4696                 struct ceph_object_locator *oloc,
4697                 rados_watchcb2_t wcb,
4698                 rados_watcherrcb_t errcb,
4699                 void *data)
4700 {
4701         struct ceph_osd_linger_request *lreq;
4702         int ret;
4703
4704         lreq = linger_alloc(osdc);
4705         if (!lreq)
4706                 return ERR_PTR(-ENOMEM);
4707
4708         lreq->is_watch = true;
4709         lreq->wcb = wcb;
4710         lreq->errcb = errcb;
4711         lreq->data = data;
4712         lreq->watch_valid_thru = jiffies;
4713
4714         ceph_oid_copy(&lreq->t.base_oid, oid);
4715         ceph_oloc_copy(&lreq->t.base_oloc, oloc);
4716         lreq->t.flags = CEPH_OSD_FLAG_WRITE;
4717         ktime_get_real_ts64(&lreq->mtime);
4718
4719         linger_submit(lreq);
4720         ret = linger_reg_commit_wait(lreq);
4721         if (ret) {
4722                 linger_cancel(lreq);
4723                 goto err_put_lreq;
4724         }
4725
4726         return lreq;
4727
4728 err_put_lreq:
4729         linger_put(lreq);
4730         return ERR_PTR(ret);
4731 }
4732 EXPORT_SYMBOL(ceph_osdc_watch);
4733
4734 /*
4735  * Releases a ref.
4736  *
4737  * Times out after mount_timeout to preserve rbd unmap behaviour
4738  * introduced in 2894e1d76974 ("rbd: timeout watch teardown on unmap
4739  * with mount_timeout").
4740  */
4741 int ceph_osdc_unwatch(struct ceph_osd_client *osdc,
4742                       struct ceph_osd_linger_request *lreq)
4743 {
4744         struct ceph_options *opts = osdc->client->options;
4745         struct ceph_osd_request *req;
4746         int ret;
4747
4748         req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
4749         if (!req)
4750                 return -ENOMEM;
4751
4752         ceph_oid_copy(&req->r_base_oid, &lreq->t.base_oid);
4753         ceph_oloc_copy(&req->r_base_oloc, &lreq->t.base_oloc);
4754         req->r_flags = CEPH_OSD_FLAG_WRITE;
4755         ktime_get_real_ts64(&req->r_mtime);
4756         osd_req_op_watch_init(req, 0, CEPH_OSD_WATCH_OP_UNWATCH,
4757                               lreq->linger_id, 0);
4758
4759         ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
4760         if (ret)
4761                 goto out_put_req;
4762
4763         ceph_osdc_start_request(osdc, req);
4764         linger_cancel(lreq);
4765         linger_put(lreq);
4766         ret = wait_request_timeout(req, opts->mount_timeout);
4767
4768 out_put_req:
4769         ceph_osdc_put_request(req);
4770         return ret;
4771 }
4772 EXPORT_SYMBOL(ceph_osdc_unwatch);
4773
4774 static int osd_req_op_notify_ack_init(struct ceph_osd_request *req, int which,
4775                                       u64 notify_id, u64 cookie, void *payload,
4776                                       u32 payload_len)
4777 {
4778         struct ceph_osd_req_op *op;
4779         struct ceph_pagelist *pl;
4780         int ret;
4781
4782         op = osd_req_op_init(req, which, CEPH_OSD_OP_NOTIFY_ACK, 0);
4783
4784         pl = ceph_pagelist_alloc(GFP_NOIO);
4785         if (!pl)
4786                 return -ENOMEM;
4787
4788         ret = ceph_pagelist_encode_64(pl, notify_id);
4789         ret |= ceph_pagelist_encode_64(pl, cookie);
4790         if (payload) {
4791                 ret |= ceph_pagelist_encode_32(pl, payload_len);
4792                 ret |= ceph_pagelist_append(pl, payload, payload_len);
4793         } else {
4794                 ret |= ceph_pagelist_encode_32(pl, 0);
4795         }
4796         if (ret) {
4797                 ceph_pagelist_release(pl);
4798                 return -ENOMEM;
4799         }
4800
4801         ceph_osd_data_pagelist_init(&op->notify_ack.request_data, pl);
4802         op->indata_len = pl->length;
4803         return 0;
4804 }
4805
4806 int ceph_osdc_notify_ack(struct ceph_osd_client *osdc,
4807                          struct ceph_object_id *oid,
4808                          struct ceph_object_locator *oloc,
4809                          u64 notify_id,
4810                          u64 cookie,
4811                          void *payload,
4812                          u32 payload_len)
4813 {
4814         struct ceph_osd_request *req;
4815         int ret;
4816
4817         req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
4818         if (!req)
4819                 return -ENOMEM;
4820
4821         ceph_oid_copy(&req->r_base_oid, oid);
4822         ceph_oloc_copy(&req->r_base_oloc, oloc);
4823         req->r_flags = CEPH_OSD_FLAG_READ;
4824
4825         ret = osd_req_op_notify_ack_init(req, 0, notify_id, cookie, payload,
4826                                          payload_len);
4827         if (ret)
4828                 goto out_put_req;
4829
4830         ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
4831         if (ret)
4832                 goto out_put_req;
4833
4834         ceph_osdc_start_request(osdc, req);
4835         ret = ceph_osdc_wait_request(osdc, req);
4836
4837 out_put_req:
4838         ceph_osdc_put_request(req);
4839         return ret;
4840 }
4841 EXPORT_SYMBOL(ceph_osdc_notify_ack);
4842
4843 /*
4844  * @timeout: in seconds
4845  *
4846  * @preply_{pages,len} are initialized both on success and error.
4847  * The caller is responsible for:
4848  *
4849  *     ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len))
4850  */
4851 int ceph_osdc_notify(struct ceph_osd_client *osdc,
4852                      struct ceph_object_id *oid,
4853                      struct ceph_object_locator *oloc,
4854                      void *payload,
4855                      u32 payload_len,
4856                      u32 timeout,
4857                      struct page ***preply_pages,
4858                      size_t *preply_len)
4859 {
4860         struct ceph_osd_linger_request *lreq;
4861         int ret;
4862
4863         WARN_ON(!timeout);
4864         if (preply_pages) {
4865                 *preply_pages = NULL;
4866                 *preply_len = 0;
4867         }
4868
4869         lreq = linger_alloc(osdc);
4870         if (!lreq)
4871                 return -ENOMEM;
4872
4873         lreq->request_pl = ceph_pagelist_alloc(GFP_NOIO);
4874         if (!lreq->request_pl) {
4875                 ret = -ENOMEM;
4876                 goto out_put_lreq;
4877         }
4878
4879         ret = ceph_pagelist_encode_32(lreq->request_pl, 1); /* prot_ver */
4880         ret |= ceph_pagelist_encode_32(lreq->request_pl, timeout);
4881         ret |= ceph_pagelist_encode_32(lreq->request_pl, payload_len);
4882         ret |= ceph_pagelist_append(lreq->request_pl, payload, payload_len);
4883         if (ret) {
4884                 ret = -ENOMEM;
4885                 goto out_put_lreq;
4886         }
4887
4888         /* for notify_id */
4889         lreq->notify_id_pages = ceph_alloc_page_vector(1, GFP_NOIO);
4890         if (IS_ERR(lreq->notify_id_pages)) {
4891                 ret = PTR_ERR(lreq->notify_id_pages);
4892                 lreq->notify_id_pages = NULL;
4893                 goto out_put_lreq;
4894         }
4895
4896         lreq->preply_pages = preply_pages;
4897         lreq->preply_len = preply_len;
4898
4899         ceph_oid_copy(&lreq->t.base_oid, oid);
4900         ceph_oloc_copy(&lreq->t.base_oloc, oloc);
4901         lreq->t.flags = CEPH_OSD_FLAG_READ;
4902
4903         linger_submit(lreq);
4904         ret = linger_reg_commit_wait(lreq);
4905         if (!ret)
4906                 ret = linger_notify_finish_wait(lreq,
4907                                  msecs_to_jiffies(2 * timeout * MSEC_PER_SEC));
4908         else
4909                 dout("lreq %p failed to initiate notify %d\n", lreq, ret);
4910
4911         linger_cancel(lreq);
4912 out_put_lreq:
4913         linger_put(lreq);
4914         return ret;
4915 }
4916 EXPORT_SYMBOL(ceph_osdc_notify);
4917
4918 /*
4919  * Return the number of milliseconds since the watch was last
4920  * confirmed, or an error.  If there is an error, the watch is no
4921  * longer valid, and should be destroyed with ceph_osdc_unwatch().
4922  */
4923 int ceph_osdc_watch_check(struct ceph_osd_client *osdc,
4924                           struct ceph_osd_linger_request *lreq)
4925 {
4926         unsigned long stamp, age;
4927         int ret;
4928
4929         down_read(&osdc->lock);
4930         mutex_lock(&lreq->lock);
4931         stamp = lreq->watch_valid_thru;
4932         if (!list_empty(&lreq->pending_lworks)) {
4933                 struct linger_work *lwork =
4934                     list_first_entry(&lreq->pending_lworks,
4935                                      struct linger_work,
4936                                      pending_item);
4937
4938                 if (time_before(lwork->queued_stamp, stamp))
4939                         stamp = lwork->queued_stamp;
4940         }
4941         age = jiffies - stamp;
4942         dout("%s lreq %p linger_id %llu age %lu last_error %d\n", __func__,
4943              lreq, lreq->linger_id, age, lreq->last_error);
4944         /* we are truncating to msecs, so return a safe upper bound */
4945         ret = lreq->last_error ?: 1 + jiffies_to_msecs(age);
4946
4947         mutex_unlock(&lreq->lock);
4948         up_read(&osdc->lock);
4949         return ret;
4950 }
4951
4952 static int decode_watcher(void **p, void *end, struct ceph_watch_item *item)
4953 {
4954         u8 struct_v;
4955         u32 struct_len;
4956         int ret;
4957
4958         ret = ceph_start_decoding(p, end, 2, "watch_item_t",
4959                                   &struct_v, &struct_len);
4960         if (ret)
4961                 goto bad;
4962
4963         ret = -EINVAL;
4964         ceph_decode_copy_safe(p, end, &item->name, sizeof(item->name), bad);
4965         ceph_decode_64_safe(p, end, item->cookie, bad);
4966         ceph_decode_skip_32(p, end, bad); /* skip timeout seconds */
4967
4968         if (struct_v >= 2) {
4969                 ret = ceph_decode_entity_addr(p, end, &item->addr);
4970                 if (ret)
4971                         goto bad;
4972         } else {
4973                 ret = 0;
4974         }
4975
4976         dout("%s %s%llu cookie %llu addr %s\n", __func__,
4977              ENTITY_NAME(item->name), item->cookie,
4978              ceph_pr_addr(&item->addr));
4979 bad:
4980         return ret;
4981 }
4982
4983 static int decode_watchers(void **p, void *end,
4984                            struct ceph_watch_item **watchers,
4985                            u32 *num_watchers)
4986 {
4987         u8 struct_v;
4988         u32 struct_len;
4989         int i;
4990         int ret;
4991
4992         ret = ceph_start_decoding(p, end, 1, "obj_list_watch_response_t",
4993                                   &struct_v, &struct_len);
4994         if (ret)
4995                 return ret;
4996
4997         *num_watchers = ceph_decode_32(p);
4998         *watchers = kcalloc(*num_watchers, sizeof(**watchers), GFP_NOIO);
4999         if (!*watchers)
5000                 return -ENOMEM;
5001
5002         for (i = 0; i < *num_watchers; i++) {
5003                 ret = decode_watcher(p, end, *watchers + i);
5004                 if (ret) {
5005                         kfree(*watchers);
5006                         return ret;
5007                 }
5008         }
5009
5010         return 0;
5011 }
5012
5013 /*
5014  * On success, the caller is responsible for:
5015  *
5016  *     kfree(watchers);
5017  */
5018 int ceph_osdc_list_watchers(struct ceph_osd_client *osdc,
5019                             struct ceph_object_id *oid,
5020                             struct ceph_object_locator *oloc,
5021                             struct ceph_watch_item **watchers,
5022                             u32 *num_watchers)
5023 {
5024         struct ceph_osd_request *req;
5025         struct page **pages;
5026         int ret;
5027
5028         req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
5029         if (!req)
5030                 return -ENOMEM;
5031
5032         ceph_oid_copy(&req->r_base_oid, oid);
5033         ceph_oloc_copy(&req->r_base_oloc, oloc);
5034         req->r_flags = CEPH_OSD_FLAG_READ;
5035
5036         pages = ceph_alloc_page_vector(1, GFP_NOIO);
5037         if (IS_ERR(pages)) {
5038                 ret = PTR_ERR(pages);
5039                 goto out_put_req;
5040         }
5041
5042         osd_req_op_init(req, 0, CEPH_OSD_OP_LIST_WATCHERS, 0);
5043         ceph_osd_data_pages_init(osd_req_op_data(req, 0, list_watchers,
5044                                                  response_data),
5045                                  pages, PAGE_SIZE, 0, false, true);
5046
5047         ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
5048         if (ret)
5049                 goto out_put_req;
5050
5051         ceph_osdc_start_request(osdc, req);
5052         ret = ceph_osdc_wait_request(osdc, req);
5053         if (ret >= 0) {
5054                 void *p = page_address(pages[0]);
5055                 void *const end = p + req->r_ops[0].outdata_len;
5056
5057                 ret = decode_watchers(&p, end, watchers, num_watchers);
5058         }
5059
5060 out_put_req:
5061         ceph_osdc_put_request(req);
5062         return ret;
5063 }
5064 EXPORT_SYMBOL(ceph_osdc_list_watchers);
5065
5066 /*
5067  * Call all pending notify callbacks - for use after a watch is
5068  * unregistered, to make sure no more callbacks for it will be invoked
5069  */
5070 void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc)
5071 {
5072         dout("%s osdc %p\n", __func__, osdc);
5073         flush_workqueue(osdc->notify_wq);
5074 }
5075 EXPORT_SYMBOL(ceph_osdc_flush_notifies);
5076
5077 void ceph_osdc_maybe_request_map(struct ceph_osd_client *osdc)
5078 {
5079         down_read(&osdc->lock);
5080         maybe_request_map(osdc);
5081         up_read(&osdc->lock);
5082 }
5083 EXPORT_SYMBOL(ceph_osdc_maybe_request_map);
5084
5085 /*
5086  * Execute an OSD class method on an object.
5087  *
5088  * @flags: CEPH_OSD_FLAG_*
5089  * @resp_len: in/out param for reply length
5090  */
5091 int ceph_osdc_call(struct ceph_osd_client *osdc,
5092                    struct ceph_object_id *oid,
5093                    struct ceph_object_locator *oloc,
5094                    const char *class, const char *method,
5095                    unsigned int flags,
5096                    struct page *req_page, size_t req_len,
5097                    struct page **resp_pages, size_t *resp_len)
5098 {
5099         struct ceph_osd_request *req;
5100         int ret;
5101
5102         if (req_len > PAGE_SIZE)
5103                 return -E2BIG;
5104
5105         req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
5106         if (!req)
5107                 return -ENOMEM;
5108
5109         ceph_oid_copy(&req->r_base_oid, oid);
5110         ceph_oloc_copy(&req->r_base_oloc, oloc);
5111         req->r_flags = flags;
5112
5113         ret = osd_req_op_cls_init(req, 0, class, method);
5114         if (ret)
5115                 goto out_put_req;
5116
5117         if (req_page)
5118                 osd_req_op_cls_request_data_pages(req, 0, &req_page, req_len,
5119                                                   0, false, false);
5120         if (resp_pages)
5121                 osd_req_op_cls_response_data_pages(req, 0, resp_pages,
5122                                                    *resp_len, 0, false, false);
5123
5124         ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
5125         if (ret)
5126                 goto out_put_req;
5127
5128         ceph_osdc_start_request(osdc, req);
5129         ret = ceph_osdc_wait_request(osdc, req);
5130         if (ret >= 0) {
5131                 ret = req->r_ops[0].rval;
5132                 if (resp_pages)
5133                         *resp_len = req->r_ops[0].outdata_len;
5134         }
5135
5136 out_put_req:
5137         ceph_osdc_put_request(req);
5138         return ret;
5139 }
5140 EXPORT_SYMBOL(ceph_osdc_call);
5141
5142 /*
5143  * reset all osd connections
5144  */
5145 void ceph_osdc_reopen_osds(struct ceph_osd_client *osdc)
5146 {
5147         struct rb_node *n;
5148
5149         down_write(&osdc->lock);
5150         for (n = rb_first(&osdc->osds); n; ) {
5151                 struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
5152
5153                 n = rb_next(n);
5154                 if (!reopen_osd(osd))
5155                         kick_osd_requests(osd);
5156         }
5157         up_write(&osdc->lock);
5158 }
5159
5160 /*
5161  * init, shutdown
5162  */
5163 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
5164 {
5165         int err;
5166
5167         dout("init\n");
5168         osdc->client = client;
5169         init_rwsem(&osdc->lock);
5170         osdc->osds = RB_ROOT;
5171         INIT_LIST_HEAD(&osdc->osd_lru);
5172         spin_lock_init(&osdc->osd_lru_lock);
5173         osd_init(&osdc->homeless_osd);
5174         osdc->homeless_osd.o_osdc = osdc;
5175         osdc->homeless_osd.o_osd = CEPH_HOMELESS_OSD;
5176         osdc->last_linger_id = CEPH_LINGER_ID_START;
5177         osdc->linger_requests = RB_ROOT;
5178         osdc->map_checks = RB_ROOT;
5179         osdc->linger_map_checks = RB_ROOT;
5180         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
5181         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
5182
5183         err = -ENOMEM;
5184         osdc->osdmap = ceph_osdmap_alloc();
5185         if (!osdc->osdmap)
5186                 goto out;
5187
5188         osdc->req_mempool = mempool_create_slab_pool(10,
5189                                                      ceph_osd_request_cache);
5190         if (!osdc->req_mempool)
5191                 goto out_map;
5192
5193         err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
5194                                 PAGE_SIZE, CEPH_OSD_SLAB_OPS, 10, "osd_op");
5195         if (err < 0)
5196                 goto out_mempool;
5197         err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
5198                                 PAGE_SIZE, CEPH_OSD_SLAB_OPS, 10,
5199                                 "osd_op_reply");
5200         if (err < 0)
5201                 goto out_msgpool;
5202
5203         err = -ENOMEM;
5204         osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
5205         if (!osdc->notify_wq)
5206                 goto out_msgpool_reply;
5207
5208         osdc->completion_wq = create_singlethread_workqueue("ceph-completion");
5209         if (!osdc->completion_wq)
5210                 goto out_notify_wq;
5211
5212         schedule_delayed_work(&osdc->timeout_work,
5213                               osdc->client->options->osd_keepalive_timeout);
5214         schedule_delayed_work(&osdc->osds_timeout_work,
5215             round_jiffies_relative(osdc->client->options->osd_idle_ttl));
5216
5217         return 0;
5218
5219 out_notify_wq:
5220         destroy_workqueue(osdc->notify_wq);
5221 out_msgpool_reply:
5222         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
5223 out_msgpool:
5224         ceph_msgpool_destroy(&osdc->msgpool_op);
5225 out_mempool:
5226         mempool_destroy(osdc->req_mempool);
5227 out_map:
5228         ceph_osdmap_destroy(osdc->osdmap);
5229 out:
5230         return err;
5231 }
5232
5233 void ceph_osdc_stop(struct ceph_osd_client *osdc)
5234 {
5235         destroy_workqueue(osdc->completion_wq);
5236         destroy_workqueue(osdc->notify_wq);
5237         cancel_delayed_work_sync(&osdc->timeout_work);
5238         cancel_delayed_work_sync(&osdc->osds_timeout_work);
5239
5240         down_write(&osdc->lock);
5241         while (!RB_EMPTY_ROOT(&osdc->osds)) {
5242                 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
5243                                                 struct ceph_osd, o_node);
5244                 close_osd(osd);
5245         }
5246         up_write(&osdc->lock);
5247         WARN_ON(refcount_read(&osdc->homeless_osd.o_ref) != 1);
5248         osd_cleanup(&osdc->homeless_osd);
5249
5250         WARN_ON(!list_empty(&osdc->osd_lru));
5251         WARN_ON(!RB_EMPTY_ROOT(&osdc->linger_requests));
5252         WARN_ON(!RB_EMPTY_ROOT(&osdc->map_checks));
5253         WARN_ON(!RB_EMPTY_ROOT(&osdc->linger_map_checks));
5254         WARN_ON(atomic_read(&osdc->num_requests));
5255         WARN_ON(atomic_read(&osdc->num_homeless));
5256
5257         ceph_osdmap_destroy(osdc->osdmap);
5258         mempool_destroy(osdc->req_mempool);
5259         ceph_msgpool_destroy(&osdc->msgpool_op);
5260         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
5261 }
5262
5263 int osd_req_op_copy_from_init(struct ceph_osd_request *req,
5264                               u64 src_snapid, u64 src_version,
5265                               struct ceph_object_id *src_oid,
5266                               struct ceph_object_locator *src_oloc,
5267                               u32 src_fadvise_flags,
5268                               u32 dst_fadvise_flags,
5269                               u32 truncate_seq, u64 truncate_size,
5270                               u8 copy_from_flags)
5271 {
5272         struct ceph_osd_req_op *op;
5273         struct page **pages;
5274         void *p, *end;
5275
5276         pages = ceph_alloc_page_vector(1, GFP_KERNEL);
5277         if (IS_ERR(pages))
5278                 return PTR_ERR(pages);
5279
5280         op = osd_req_op_init(req, 0, CEPH_OSD_OP_COPY_FROM2,
5281                              dst_fadvise_flags);
5282         op->copy_from.snapid = src_snapid;
5283         op->copy_from.src_version = src_version;
5284         op->copy_from.flags = copy_from_flags;
5285         op->copy_from.src_fadvise_flags = src_fadvise_flags;
5286
5287         p = page_address(pages[0]);
5288         end = p + PAGE_SIZE;
5289         ceph_encode_string(&p, end, src_oid->name, src_oid->name_len);
5290         encode_oloc(&p, end, src_oloc);
5291         ceph_encode_32(&p, truncate_seq);
5292         ceph_encode_64(&p, truncate_size);
5293         op->indata_len = PAGE_SIZE - (end - p);
5294
5295         ceph_osd_data_pages_init(&op->copy_from.osd_data, pages,
5296                                  op->indata_len, 0, false, true);
5297         return 0;
5298 }
5299 EXPORT_SYMBOL(osd_req_op_copy_from_init);
5300
5301 int __init ceph_osdc_setup(void)
5302 {
5303         size_t size = sizeof(struct ceph_osd_request) +
5304             CEPH_OSD_SLAB_OPS * sizeof(struct ceph_osd_req_op);
5305
5306         BUG_ON(ceph_osd_request_cache);
5307         ceph_osd_request_cache = kmem_cache_create("ceph_osd_request", size,
5308                                                    0, 0, NULL);
5309
5310         return ceph_osd_request_cache ? 0 : -ENOMEM;
5311 }
5312
5313 void ceph_osdc_cleanup(void)
5314 {
5315         BUG_ON(!ceph_osd_request_cache);
5316         kmem_cache_destroy(ceph_osd_request_cache);
5317         ceph_osd_request_cache = NULL;
5318 }
5319
5320 /*
5321  * handle incoming message
5322  */
5323 static void osd_dispatch(struct ceph_connection *con, struct ceph_msg *msg)
5324 {
5325         struct ceph_osd *osd = con->private;
5326         struct ceph_osd_client *osdc = osd->o_osdc;
5327         int type = le16_to_cpu(msg->hdr.type);
5328
5329         switch (type) {
5330         case CEPH_MSG_OSD_MAP:
5331                 ceph_osdc_handle_map(osdc, msg);
5332                 break;
5333         case CEPH_MSG_OSD_OPREPLY:
5334                 handle_reply(osd, msg);
5335                 break;
5336         case CEPH_MSG_OSD_BACKOFF:
5337                 handle_backoff(osd, msg);
5338                 break;
5339         case CEPH_MSG_WATCH_NOTIFY:
5340                 handle_watch_notify(osdc, msg);
5341                 break;
5342
5343         default:
5344                 pr_err("received unknown message type %d %s\n", type,
5345                        ceph_msg_type_name(type));
5346         }
5347
5348         ceph_msg_put(msg);
5349 }
5350
5351 /*
5352  * Lookup and return message for incoming reply.  Don't try to do
5353  * anything about a larger than preallocated data portion of the
5354  * message at the moment - for now, just skip the message.
5355  */
5356 static struct ceph_msg *get_reply(struct ceph_connection *con,
5357                                   struct ceph_msg_header *hdr,
5358                                   int *skip)
5359 {
5360         struct ceph_osd *osd = con->private;
5361         struct ceph_osd_client *osdc = osd->o_osdc;
5362         struct ceph_msg *m = NULL;
5363         struct ceph_osd_request *req;
5364         int front_len = le32_to_cpu(hdr->front_len);
5365         int data_len = le32_to_cpu(hdr->data_len);
5366         u64 tid = le64_to_cpu(hdr->tid);
5367
5368         down_read(&osdc->lock);
5369         if (!osd_registered(osd)) {
5370                 dout("%s osd%d unknown, skipping\n", __func__, osd->o_osd);
5371                 *skip = 1;
5372                 goto out_unlock_osdc;
5373         }
5374         WARN_ON(osd->o_osd != le64_to_cpu(hdr->src.num));
5375
5376         mutex_lock(&osd->lock);
5377         req = lookup_request(&osd->o_requests, tid);
5378         if (!req) {
5379                 dout("%s osd%d tid %llu unknown, skipping\n", __func__,
5380                      osd->o_osd, tid);
5381                 *skip = 1;
5382                 goto out_unlock_session;
5383         }
5384
5385         ceph_msg_revoke_incoming(req->r_reply);
5386
5387         if (front_len > req->r_reply->front_alloc_len) {
5388                 pr_warn("%s osd%d tid %llu front %d > preallocated %d\n",
5389                         __func__, osd->o_osd, req->r_tid, front_len,
5390                         req->r_reply->front_alloc_len);
5391                 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front_len, GFP_NOFS,
5392                                  false);
5393                 if (!m)
5394                         goto out_unlock_session;
5395                 ceph_msg_put(req->r_reply);
5396                 req->r_reply = m;
5397         }
5398
5399         if (data_len > req->r_reply->data_length) {
5400                 pr_warn("%s osd%d tid %llu data %d > preallocated %zu, skipping\n",
5401                         __func__, osd->o_osd, req->r_tid, data_len,
5402                         req->r_reply->data_length);
5403                 m = NULL;
5404                 *skip = 1;
5405                 goto out_unlock_session;
5406         }
5407
5408         m = ceph_msg_get(req->r_reply);
5409         dout("get_reply tid %lld %p\n", tid, m);
5410
5411 out_unlock_session:
5412         mutex_unlock(&osd->lock);
5413 out_unlock_osdc:
5414         up_read(&osdc->lock);
5415         return m;
5416 }
5417
5418 static struct ceph_msg *alloc_msg_with_page_vector(struct ceph_msg_header *hdr)
5419 {
5420         struct ceph_msg *m;
5421         int type = le16_to_cpu(hdr->type);
5422         u32 front_len = le32_to_cpu(hdr->front_len);
5423         u32 data_len = le32_to_cpu(hdr->data_len);
5424
5425         m = ceph_msg_new2(type, front_len, 1, GFP_NOIO, false);
5426         if (!m)
5427                 return NULL;
5428
5429         if (data_len) {
5430                 struct page **pages;
5431
5432                 pages = ceph_alloc_page_vector(calc_pages_for(0, data_len),
5433                                                GFP_NOIO);
5434                 if (IS_ERR(pages)) {
5435                         ceph_msg_put(m);
5436                         return NULL;
5437                 }
5438
5439                 ceph_msg_data_add_pages(m, pages, data_len, 0, true);
5440         }
5441
5442         return m;
5443 }
5444
5445 static struct ceph_msg *osd_alloc_msg(struct ceph_connection *con,
5446                                       struct ceph_msg_header *hdr,
5447                                       int *skip)
5448 {
5449         struct ceph_osd *osd = con->private;
5450         int type = le16_to_cpu(hdr->type);
5451
5452         *skip = 0;
5453         switch (type) {
5454         case CEPH_MSG_OSD_MAP:
5455         case CEPH_MSG_OSD_BACKOFF:
5456         case CEPH_MSG_WATCH_NOTIFY:
5457                 return alloc_msg_with_page_vector(hdr);
5458         case CEPH_MSG_OSD_OPREPLY:
5459                 return get_reply(con, hdr, skip);
5460         default:
5461                 pr_warn("%s osd%d unknown msg type %d, skipping\n", __func__,
5462                         osd->o_osd, type);
5463                 *skip = 1;
5464                 return NULL;
5465         }
5466 }
5467
5468 /*
5469  * Wrappers to refcount containing ceph_osd struct
5470  */
5471 static struct ceph_connection *osd_get_con(struct ceph_connection *con)
5472 {
5473         struct ceph_osd *osd = con->private;
5474         if (get_osd(osd))
5475                 return con;
5476         return NULL;
5477 }
5478
5479 static void osd_put_con(struct ceph_connection *con)
5480 {
5481         struct ceph_osd *osd = con->private;
5482         put_osd(osd);
5483 }
5484
5485 /*
5486  * authentication
5487  */
5488
5489 /*
5490  * Note: returned pointer is the address of a structure that's
5491  * managed separately.  Caller must *not* attempt to free it.
5492  */
5493 static struct ceph_auth_handshake *
5494 osd_get_authorizer(struct ceph_connection *con, int *proto, int force_new)
5495 {
5496         struct ceph_osd *o = con->private;
5497         struct ceph_osd_client *osdc = o->o_osdc;
5498         struct ceph_auth_client *ac = osdc->client->monc.auth;
5499         struct ceph_auth_handshake *auth = &o->o_auth;
5500         int ret;
5501
5502         ret = __ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_OSD,
5503                                          force_new, proto, NULL, NULL);
5504         if (ret)
5505                 return ERR_PTR(ret);
5506
5507         return auth;
5508 }
5509
5510 static int osd_add_authorizer_challenge(struct ceph_connection *con,
5511                                     void *challenge_buf, int challenge_buf_len)
5512 {
5513         struct ceph_osd *o = con->private;
5514         struct ceph_osd_client *osdc = o->o_osdc;
5515         struct ceph_auth_client *ac = osdc->client->monc.auth;
5516
5517         return ceph_auth_add_authorizer_challenge(ac, o->o_auth.authorizer,
5518                                             challenge_buf, challenge_buf_len);
5519 }
5520
5521 static int osd_verify_authorizer_reply(struct ceph_connection *con)
5522 {
5523         struct ceph_osd *o = con->private;
5524         struct ceph_osd_client *osdc = o->o_osdc;
5525         struct ceph_auth_client *ac = osdc->client->monc.auth;
5526         struct ceph_auth_handshake *auth = &o->o_auth;
5527
5528         return ceph_auth_verify_authorizer_reply(ac, auth->authorizer,
5529                 auth->authorizer_reply_buf, auth->authorizer_reply_buf_len,
5530                 NULL, NULL, NULL, NULL);
5531 }
5532
5533 static int osd_invalidate_authorizer(struct ceph_connection *con)
5534 {
5535         struct ceph_osd *o = con->private;
5536         struct ceph_osd_client *osdc = o->o_osdc;
5537         struct ceph_auth_client *ac = osdc->client->monc.auth;
5538
5539         ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
5540         return ceph_monc_validate_auth(&osdc->client->monc);
5541 }
5542
5543 static int osd_get_auth_request(struct ceph_connection *con,
5544                                 void *buf, int *buf_len,
5545                                 void **authorizer, int *authorizer_len)
5546 {
5547         struct ceph_osd *o = con->private;
5548         struct ceph_auth_client *ac = o->o_osdc->client->monc.auth;
5549         struct ceph_auth_handshake *auth = &o->o_auth;
5550         int ret;
5551
5552         ret = ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_OSD,
5553                                        buf, buf_len);
5554         if (ret)
5555                 return ret;
5556
5557         *authorizer = auth->authorizer_buf;
5558         *authorizer_len = auth->authorizer_buf_len;
5559         return 0;
5560 }
5561
5562 static int osd_handle_auth_reply_more(struct ceph_connection *con,
5563                                       void *reply, int reply_len,
5564                                       void *buf, int *buf_len,
5565                                       void **authorizer, int *authorizer_len)
5566 {
5567         struct ceph_osd *o = con->private;
5568         struct ceph_auth_client *ac = o->o_osdc->client->monc.auth;
5569         struct ceph_auth_handshake *auth = &o->o_auth;
5570         int ret;
5571
5572         ret = ceph_auth_handle_svc_reply_more(ac, auth, reply, reply_len,
5573                                               buf, buf_len);
5574         if (ret)
5575                 return ret;
5576
5577         *authorizer = auth->authorizer_buf;
5578         *authorizer_len = auth->authorizer_buf_len;
5579         return 0;
5580 }
5581
5582 static int osd_handle_auth_done(struct ceph_connection *con,
5583                                 u64 global_id, void *reply, int reply_len,
5584                                 u8 *session_key, int *session_key_len,
5585                                 u8 *con_secret, int *con_secret_len)
5586 {
5587         struct ceph_osd *o = con->private;
5588         struct ceph_auth_client *ac = o->o_osdc->client->monc.auth;
5589         struct ceph_auth_handshake *auth = &o->o_auth;
5590
5591         return ceph_auth_handle_svc_reply_done(ac, auth, reply, reply_len,
5592                                                session_key, session_key_len,
5593                                                con_secret, con_secret_len);
5594 }
5595
5596 static int osd_handle_auth_bad_method(struct ceph_connection *con,
5597                                       int used_proto, int result,
5598                                       const int *allowed_protos, int proto_cnt,
5599                                       const int *allowed_modes, int mode_cnt)
5600 {
5601         struct ceph_osd *o = con->private;
5602         struct ceph_mon_client *monc = &o->o_osdc->client->monc;
5603         int ret;
5604
5605         if (ceph_auth_handle_bad_authorizer(monc->auth, CEPH_ENTITY_TYPE_OSD,
5606                                             used_proto, result,
5607                                             allowed_protos, proto_cnt,
5608                                             allowed_modes, mode_cnt)) {
5609                 ret = ceph_monc_validate_auth(monc);
5610                 if (ret)
5611                         return ret;
5612         }
5613
5614         return -EACCES;
5615 }
5616
5617 static void osd_reencode_message(struct ceph_msg *msg)
5618 {
5619         int type = le16_to_cpu(msg->hdr.type);
5620
5621         if (type == CEPH_MSG_OSD_OP)
5622                 encode_request_finish(msg);
5623 }
5624
5625 static int osd_sign_message(struct ceph_msg *msg)
5626 {
5627         struct ceph_osd *o = msg->con->private;
5628         struct ceph_auth_handshake *auth = &o->o_auth;
5629
5630         return ceph_auth_sign_message(auth, msg);
5631 }
5632
5633 static int osd_check_message_signature(struct ceph_msg *msg)
5634 {
5635         struct ceph_osd *o = msg->con->private;
5636         struct ceph_auth_handshake *auth = &o->o_auth;
5637
5638         return ceph_auth_check_message_signature(auth, msg);
5639 }
5640
5641 static const struct ceph_connection_operations osd_con_ops = {
5642         .get = osd_get_con,
5643         .put = osd_put_con,
5644         .alloc_msg = osd_alloc_msg,
5645         .dispatch = osd_dispatch,
5646         .fault = osd_fault,
5647         .reencode_message = osd_reencode_message,
5648         .get_authorizer = osd_get_authorizer,
5649         .add_authorizer_challenge = osd_add_authorizer_challenge,
5650         .verify_authorizer_reply = osd_verify_authorizer_reply,
5651         .invalidate_authorizer = osd_invalidate_authorizer,
5652         .sign_message = osd_sign_message,
5653         .check_message_signature = osd_check_message_signature,
5654         .get_auth_request = osd_get_auth_request,
5655         .handle_auth_reply_more = osd_handle_auth_reply_more,
5656         .handle_auth_done = osd_handle_auth_done,
5657         .handle_auth_bad_method = osd_handle_auth_bad_method,
5658 };