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