2 * pNFS functions to call and manage layout drivers.
4 * Copyright (c) 2002 [year of first publication]
5 * The Regents of the University of Michigan
8 * Dean Hildebrand <dhildebz@umich.edu>
10 * Permission is granted to use, copy, create derivative works, and
11 * redistribute this software and such derivative works for any purpose,
12 * so long as the name of the University of Michigan is not used in
13 * any advertising or publicity pertaining to the use or distribution
14 * of this software without specific, written prior authorization. If
15 * the above copyright notice or any other identification of the
16 * University of Michigan is included in any copy of any portion of
17 * this software, then the disclaimer below must also be included.
19 * This software is provided as is, without representation or warranty
20 * of any kind either express or implied, including without limitation
21 * the implied warranties of merchantability, fitness for a particular
22 * purpose, or noninfringement. The Regents of the University of
23 * Michigan shall not be liable for any damages, including special,
24 * indirect, incidental, or consequential damages, with respect to any
25 * claim arising out of or in connection with the use of the software,
26 * even if it has been or is hereafter advised of the possibility of
30 #include <linux/nfs_fs.h>
31 #include <linux/nfs_page.h>
32 #include <linux/module.h>
33 #include <linux/sort.h>
37 #include "nfs4trace.h"
38 #include "delegation.h"
42 #define NFSDBG_FACILITY NFSDBG_PNFS
43 #define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
48 * protects pnfs_modules_tbl.
50 static DEFINE_SPINLOCK(pnfs_spinlock);
53 * pnfs_modules_tbl holds all pnfs modules
55 static LIST_HEAD(pnfs_modules_tbl);
57 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo);
58 static void pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
59 struct list_head *free_me,
60 const struct pnfs_layout_range *range,
62 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
63 struct list_head *tmp_list);
65 /* Return the registered pnfs layout driver module matching given id */
66 static struct pnfs_layoutdriver_type *
67 find_pnfs_driver_locked(u32 id)
69 struct pnfs_layoutdriver_type *local;
71 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
76 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
80 static struct pnfs_layoutdriver_type *
81 find_pnfs_driver(u32 id)
83 struct pnfs_layoutdriver_type *local;
85 spin_lock(&pnfs_spinlock);
86 local = find_pnfs_driver_locked(id);
87 if (local != NULL && !try_module_get(local->owner)) {
88 dprintk("%s: Could not grab reference on module\n", __func__);
91 spin_unlock(&pnfs_spinlock);
95 const struct pnfs_layoutdriver_type *pnfs_find_layoutdriver(u32 id)
97 return find_pnfs_driver(id);
100 void pnfs_put_layoutdriver(const struct pnfs_layoutdriver_type *ld)
103 module_put(ld->owner);
107 unset_pnfs_layoutdriver(struct nfs_server *nfss)
109 if (nfss->pnfs_curr_ld) {
110 if (nfss->pnfs_curr_ld->clear_layoutdriver)
111 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
112 /* Decrement the MDS count. Purge the deviceid cache if zero */
113 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
114 nfs4_deviceid_purge_client(nfss->nfs_client);
115 module_put(nfss->pnfs_curr_ld->owner);
117 nfss->pnfs_curr_ld = NULL;
121 * When the server sends a list of layout types, we choose one in the order
122 * given in the list below.
124 * FIXME: should this list be configurable in some fashion? module param?
125 * mount option? something else?
127 static const u32 ld_prefs[] = {
132 LAYOUT_NFSV4_1_FILES,
137 ld_cmp(const void *e1, const void *e2)
139 u32 ld1 = *((u32 *)e1);
140 u32 ld2 = *((u32 *)e2);
143 for (i = 0; ld_prefs[i] != 0; i++) {
144 if (ld1 == ld_prefs[i])
147 if (ld2 == ld_prefs[i])
154 * Try to set the server's pnfs module to the pnfs layout type specified by id.
155 * Currently only one pNFS layout driver per filesystem is supported.
157 * @ids array of layout types supported by MDS.
160 set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
161 struct nfs_fsinfo *fsinfo)
163 struct pnfs_layoutdriver_type *ld_type = NULL;
167 if (fsinfo->nlayouttypes == 0)
169 if (!(server->nfs_client->cl_exchange_flags &
170 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
171 printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n",
172 __func__, server->nfs_client->cl_exchange_flags);
176 sort(fsinfo->layouttype, fsinfo->nlayouttypes,
177 sizeof(*fsinfo->layouttype), ld_cmp, NULL);
179 for (i = 0; i < fsinfo->nlayouttypes; i++) {
180 id = fsinfo->layouttype[i];
181 ld_type = find_pnfs_driver(id);
183 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX,
185 ld_type = find_pnfs_driver(id);
192 dprintk("%s: No pNFS module found!\n", __func__);
196 server->pnfs_curr_ld = ld_type;
197 if (ld_type->set_layoutdriver
198 && ld_type->set_layoutdriver(server, mntfh)) {
199 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
200 "driver %u.\n", __func__, id);
201 module_put(ld_type->owner);
204 /* Bump the MDS count */
205 atomic_inc(&server->nfs_client->cl_mds_count);
207 dprintk("%s: pNFS module for %u set\n", __func__, id);
211 dprintk("%s: Using NFSv4 I/O\n", __func__);
212 server->pnfs_curr_ld = NULL;
216 pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
218 int status = -EINVAL;
219 struct pnfs_layoutdriver_type *tmp;
221 if (ld_type->id == 0) {
222 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
225 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
226 printk(KERN_ERR "NFS: %s Layout driver must provide "
227 "alloc_lseg and free_lseg.\n", __func__);
231 spin_lock(&pnfs_spinlock);
232 tmp = find_pnfs_driver_locked(ld_type->id);
234 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
236 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
239 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
240 __func__, ld_type->id);
242 spin_unlock(&pnfs_spinlock);
246 EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
249 pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
251 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
252 spin_lock(&pnfs_spinlock);
253 list_del(&ld_type->pnfs_tblid);
254 spin_unlock(&pnfs_spinlock);
256 EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
259 * pNFS client layout cache
262 /* Need to hold i_lock if caller does not already hold reference */
264 pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
266 refcount_inc(&lo->plh_refcount);
269 static struct pnfs_layout_hdr *
270 pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
272 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
273 return ld->alloc_layout_hdr(ino, gfp_flags);
277 pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
279 struct nfs_server *server = NFS_SERVER(lo->plh_inode);
280 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
282 if (!list_empty(&lo->plh_layouts)) {
283 struct nfs_client *clp = server->nfs_client;
285 spin_lock(&clp->cl_lock);
286 list_del_init(&lo->plh_layouts);
287 spin_unlock(&clp->cl_lock);
289 put_cred(lo->plh_lc_cred);
290 return ld->free_layout_hdr(lo);
294 pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
296 struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
297 dprintk("%s: freeing layout cache %p\n", __func__, lo);
299 /* Reset MDS Threshold I/O counters */
305 pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
308 unsigned long i_state;
312 inode = lo->plh_inode;
313 pnfs_layoutreturn_before_put_layout_hdr(lo);
315 if (refcount_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
316 if (!list_empty(&lo->plh_segs))
317 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
318 pnfs_detach_layout_hdr(lo);
319 i_state = inode->i_state;
320 spin_unlock(&inode->i_lock);
321 pnfs_free_layout_hdr(lo);
322 /* Notify pnfs_destroy_layout_final() that we're done */
323 if (i_state & (I_FREEING | I_CLEAR))
329 pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
332 if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode)
334 lo->plh_return_iomode = iomode;
335 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
337 WARN_ON_ONCE(lo->plh_return_seq != 0 && lo->plh_return_seq != seq);
338 lo->plh_return_seq = seq;
343 pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo)
345 struct pnfs_layout_segment *lseg;
346 lo->plh_return_iomode = 0;
347 lo->plh_return_seq = 0;
348 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
349 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
350 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
352 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
356 static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
358 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
359 clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags);
360 smp_mb__after_atomic();
361 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
362 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
366 pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg,
367 struct list_head *free_me)
369 clear_bit(NFS_LSEG_ROC, &lseg->pls_flags);
370 clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
371 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags))
372 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
373 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
374 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
378 * Update the seqid of a layout stateid after receiving
379 * NFS4ERR_OLD_STATEID
381 bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
382 struct pnfs_layout_range *dst_range,
385 struct pnfs_layout_hdr *lo;
386 struct pnfs_layout_range range = {
387 .iomode = IOMODE_ANY,
389 .length = NFS4_MAX_UINT64,
395 spin_lock(&inode->i_lock);
396 lo = NFS_I(inode)->layout;
397 if (lo && pnfs_layout_is_valid(lo) &&
398 nfs4_stateid_match_other(dst, &lo->plh_stateid)) {
399 /* Is our call using the most recent seqid? If so, bump it */
400 if (!nfs4_stateid_is_newer(&lo->plh_stateid, dst)) {
401 nfs4_stateid_seqid_inc(dst);
405 /* Try to update the seqid to the most recent */
406 err = pnfs_mark_matching_lsegs_return(lo, &head, &range, 0);
408 dst->seqid = lo->plh_stateid.seqid;
414 spin_unlock(&inode->i_lock);
415 pnfs_free_lseg_list(&head);
420 * Mark a pnfs_layout_hdr and all associated layout segments as invalid
422 * In order to continue using the pnfs_layout_hdr, a full recovery
424 * Note that caller must hold inode->i_lock.
427 pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
428 struct list_head *lseg_list)
430 struct pnfs_layout_range range = {
431 .iomode = IOMODE_ANY,
433 .length = NFS4_MAX_UINT64,
435 struct pnfs_layout_segment *lseg, *next;
437 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
438 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
439 pnfs_clear_lseg_state(lseg, lseg_list);
440 pnfs_clear_layoutreturn_info(lo);
441 pnfs_free_returned_lsegs(lo, lseg_list, &range, 0);
442 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) &&
443 !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
444 pnfs_clear_layoutreturn_waitbit(lo);
445 return !list_empty(&lo->plh_segs);
449 pnfs_iomode_to_fail_bit(u32 iomode)
451 return iomode == IOMODE_RW ?
452 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
456 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
458 lo->plh_retry_timestamp = jiffies;
459 if (!test_and_set_bit(fail_bit, &lo->plh_flags))
460 refcount_inc(&lo->plh_refcount);
464 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
466 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
467 refcount_dec(&lo->plh_refcount);
471 pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
473 struct inode *inode = lo->plh_inode;
474 struct pnfs_layout_range range = {
477 .length = NFS4_MAX_UINT64,
481 spin_lock(&inode->i_lock);
482 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
483 pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0);
484 spin_unlock(&inode->i_lock);
485 pnfs_free_lseg_list(&head);
486 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
487 iomode == IOMODE_RW ? "RW" : "READ");
491 pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
493 unsigned long start, end;
494 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
496 if (test_bit(fail_bit, &lo->plh_flags) == 0)
499 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
500 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
501 /* It is time to retry the failed layoutgets */
502 pnfs_layout_clear_fail_bit(lo, fail_bit);
509 pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg,
510 const struct pnfs_layout_range *range,
511 const nfs4_stateid *stateid)
513 INIT_LIST_HEAD(&lseg->pls_list);
514 INIT_LIST_HEAD(&lseg->pls_lc_list);
515 refcount_set(&lseg->pls_refcount, 1);
516 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
517 lseg->pls_layout = lo;
518 lseg->pls_range = *range;
519 lseg->pls_seq = be32_to_cpu(stateid->seqid);
522 static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
525 struct inode *inode = lseg->pls_layout->plh_inode;
526 NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg);
531 pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
532 struct pnfs_layout_segment *lseg)
534 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
535 list_del_init(&lseg->pls_list);
536 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
537 refcount_dec(&lo->plh_refcount);
538 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
540 if (list_empty(&lo->plh_segs) &&
541 !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
542 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
543 if (atomic_read(&lo->plh_outstanding) == 0)
544 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
545 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
550 pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo,
551 struct pnfs_layout_segment *lseg)
553 if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
554 pnfs_layout_is_valid(lo)) {
555 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
556 list_move_tail(&lseg->pls_list, &lo->plh_return_segs);
563 pnfs_put_lseg(struct pnfs_layout_segment *lseg)
565 struct pnfs_layout_hdr *lo;
571 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
572 refcount_read(&lseg->pls_refcount),
573 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
575 lo = lseg->pls_layout;
576 inode = lo->plh_inode;
578 if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
579 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
580 spin_unlock(&inode->i_lock);
583 pnfs_get_layout_hdr(lo);
584 pnfs_layout_remove_lseg(lo, lseg);
585 if (pnfs_cache_lseg_for_layoutreturn(lo, lseg))
587 spin_unlock(&inode->i_lock);
588 pnfs_free_lseg(lseg);
589 pnfs_put_layout_hdr(lo);
592 EXPORT_SYMBOL_GPL(pnfs_put_lseg);
595 * is l2 fully contained in l1?
597 * [----------------------------------)
602 pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
603 const struct pnfs_layout_range *l2)
605 u64 start1 = l1->offset;
606 u64 end1 = pnfs_end_offset(start1, l1->length);
607 u64 start2 = l2->offset;
608 u64 end2 = pnfs_end_offset(start2, l2->length);
610 return (start1 <= start2) && (end1 >= end2);
613 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
614 struct list_head *tmp_list)
616 if (!refcount_dec_and_test(&lseg->pls_refcount))
618 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
619 list_add(&lseg->pls_list, tmp_list);
623 /* Returns 1 if lseg is removed from list, 0 otherwise */
624 static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
625 struct list_head *tmp_list)
629 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
630 /* Remove the reference keeping the lseg in the
631 * list. It will now be removed when all
632 * outstanding io is finished.
634 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
635 refcount_read(&lseg->pls_refcount));
636 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
643 * Compare 2 layout stateid sequence ids, to see which is newer,
644 * taking into account wraparound issues.
646 static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
648 return (s32)(s1 - s2) > 0;
652 pnfs_should_free_range(const struct pnfs_layout_range *lseg_range,
653 const struct pnfs_layout_range *recall_range)
655 return (recall_range->iomode == IOMODE_ANY ||
656 lseg_range->iomode == recall_range->iomode) &&
657 pnfs_lseg_range_intersecting(lseg_range, recall_range);
661 pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg,
662 const struct pnfs_layout_range *recall_range,
665 if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq))
667 if (recall_range == NULL)
669 return pnfs_should_free_range(&lseg->pls_range, recall_range);
673 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later
674 * @lo: layout header containing the lsegs
675 * @tmp_list: list head where doomed lsegs should go
676 * @recall_range: optional recall range argument to match (may be NULL)
677 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0)
679 * Walk the list of lsegs in the layout header, and tear down any that should
680 * be destroyed. If "recall_range" is specified then the segment must match
681 * that range. If "seq" is non-zero, then only match segments that were handed
682 * out at or before that sequence.
684 * Returns number of matching invalid lsegs remaining in list after scanning
685 * it and purging them.
688 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
689 struct list_head *tmp_list,
690 const struct pnfs_layout_range *recall_range,
693 struct pnfs_layout_segment *lseg, *next;
696 dprintk("%s:Begin lo %p\n", __func__, lo);
698 if (list_empty(&lo->plh_segs))
700 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
701 if (pnfs_match_lseg_recall(lseg, recall_range, seq)) {
702 dprintk("%s: freeing lseg %p iomode %d seq %u "
703 "offset %llu length %llu\n", __func__,
704 lseg, lseg->pls_range.iomode, lseg->pls_seq,
705 lseg->pls_range.offset, lseg->pls_range.length);
706 if (!mark_lseg_invalid(lseg, tmp_list))
709 dprintk("%s:Return %i\n", __func__, remaining);
714 pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
715 struct list_head *free_me,
716 const struct pnfs_layout_range *range,
719 struct pnfs_layout_segment *lseg, *next;
721 list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) {
722 if (pnfs_match_lseg_recall(lseg, range, seq))
723 list_move_tail(&lseg->pls_list, free_me);
727 /* note free_me must contain lsegs from a single layout_hdr */
729 pnfs_free_lseg_list(struct list_head *free_me)
731 struct pnfs_layout_segment *lseg, *tmp;
733 if (list_empty(free_me))
736 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
737 list_del(&lseg->pls_list);
738 pnfs_free_lseg(lseg);
742 static struct pnfs_layout_hdr *__pnfs_destroy_layout(struct nfs_inode *nfsi)
744 struct pnfs_layout_hdr *lo;
747 spin_lock(&nfsi->vfs_inode.i_lock);
750 pnfs_get_layout_hdr(lo);
751 pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
752 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
753 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
754 spin_unlock(&nfsi->vfs_inode.i_lock);
755 pnfs_free_lseg_list(&tmp_list);
756 nfs_commit_inode(&nfsi->vfs_inode, 0);
757 pnfs_put_layout_hdr(lo);
759 spin_unlock(&nfsi->vfs_inode.i_lock);
763 void pnfs_destroy_layout(struct nfs_inode *nfsi)
765 __pnfs_destroy_layout(nfsi);
767 EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
769 static bool pnfs_layout_removed(struct nfs_inode *nfsi,
770 struct pnfs_layout_hdr *lo)
774 spin_lock(&nfsi->vfs_inode.i_lock);
775 ret = nfsi->layout != lo;
776 spin_unlock(&nfsi->vfs_inode.i_lock);
780 void pnfs_destroy_layout_final(struct nfs_inode *nfsi)
782 struct pnfs_layout_hdr *lo = __pnfs_destroy_layout(nfsi);
785 wait_var_event(lo, pnfs_layout_removed(nfsi, lo));
789 pnfs_layout_add_bulk_destroy_list(struct inode *inode,
790 struct list_head *layout_list)
792 struct pnfs_layout_hdr *lo;
795 spin_lock(&inode->i_lock);
796 lo = NFS_I(inode)->layout;
797 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
798 pnfs_get_layout_hdr(lo);
799 list_add(&lo->plh_bulk_destroy, layout_list);
802 spin_unlock(&inode->i_lock);
806 /* Caller must hold rcu_read_lock and clp->cl_lock */
808 pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
809 struct nfs_server *server,
810 struct list_head *layout_list)
811 __must_hold(&clp->cl_lock)
814 struct pnfs_layout_hdr *lo, *next;
817 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
818 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
819 test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) ||
820 !list_empty(&lo->plh_bulk_destroy))
822 /* If the sb is being destroyed, just bail */
823 if (!nfs_sb_active(server->super))
825 inode = igrab(lo->plh_inode);
827 list_del_init(&lo->plh_layouts);
828 if (pnfs_layout_add_bulk_destroy_list(inode,
832 spin_unlock(&clp->cl_lock);
836 spin_unlock(&clp->cl_lock);
837 set_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags);
839 nfs_sb_deactive(server->super);
840 spin_lock(&clp->cl_lock);
848 pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
851 struct pnfs_layout_hdr *lo;
853 LIST_HEAD(lseg_list);
856 while (!list_empty(layout_list)) {
857 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
859 dprintk("%s freeing layout for inode %lu\n", __func__,
860 lo->plh_inode->i_ino);
861 inode = lo->plh_inode;
863 pnfs_layoutcommit_inode(inode, false);
865 spin_lock(&inode->i_lock);
866 list_del_init(&lo->plh_bulk_destroy);
867 if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
869 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
872 spin_unlock(&inode->i_lock);
873 pnfs_free_lseg_list(&lseg_list);
874 /* Free all lsegs that are attached to commit buckets */
875 nfs_commit_inode(inode, 0);
876 pnfs_put_layout_hdr(lo);
877 nfs_iput_and_deactive(inode);
883 pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
884 struct nfs_fsid *fsid,
887 struct nfs_server *server;
888 LIST_HEAD(layout_list);
890 spin_lock(&clp->cl_lock);
893 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
894 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
896 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
902 spin_unlock(&clp->cl_lock);
904 if (list_empty(&layout_list))
906 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
910 pnfs_destroy_layouts_byclid(struct nfs_client *clp,
913 struct nfs_server *server;
914 LIST_HEAD(layout_list);
916 spin_lock(&clp->cl_lock);
919 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
920 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
926 spin_unlock(&clp->cl_lock);
928 if (list_empty(&layout_list))
930 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
934 * Called by the state manger to remove all layouts established under an
938 pnfs_destroy_all_layouts(struct nfs_client *clp)
940 nfs4_deviceid_mark_client_invalid(clp);
941 nfs4_deviceid_purge_client(clp);
943 pnfs_destroy_layouts_byclid(clp, false);
946 /* update lo->plh_stateid with new if is more recent */
948 pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
951 u32 oldseq, newseq, new_barrier = 0;
953 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
954 newseq = be32_to_cpu(new->seqid);
956 if (!pnfs_layout_is_valid(lo)) {
957 nfs4_stateid_copy(&lo->plh_stateid, new);
958 lo->plh_barrier = newseq;
959 pnfs_clear_layoutreturn_info(lo);
960 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
963 if (pnfs_seqid_is_newer(newseq, oldseq)) {
964 nfs4_stateid_copy(&lo->plh_stateid, new);
966 * Because of wraparound, we want to keep the barrier
967 * "close" to the current seqids.
969 new_barrier = newseq - atomic_read(&lo->plh_outstanding);
972 new_barrier = be32_to_cpu(new->seqid);
973 else if (new_barrier == 0)
975 if (pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
976 lo->plh_barrier = new_barrier;
980 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
981 const nfs4_stateid *stateid)
983 u32 seqid = be32_to_cpu(stateid->seqid);
985 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
988 /* lget is set to 1 if called from inside send_layoutget call chain */
990 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
992 return lo->plh_block_lgets ||
993 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
996 static struct nfs_server *
997 pnfs_find_server(struct inode *inode, struct nfs_open_context *ctx)
999 struct nfs_server *server;
1002 server = NFS_SERVER(inode);
1004 struct dentry *parent_dir = dget_parent(ctx->dentry);
1005 server = NFS_SERVER(parent_dir->d_inode);
1011 static void nfs4_free_pages(struct page **pages, size_t size)
1018 for (i = 0; i < size; i++) {
1021 __free_page(pages[i]);
1026 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
1028 struct page **pages;
1031 pages = kmalloc_array(size, sizeof(struct page *), gfp_flags);
1033 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
1037 for (i = 0; i < size; i++) {
1038 pages[i] = alloc_page(gfp_flags);
1040 dprintk("%s: failed to allocate page\n", __func__);
1041 nfs4_free_pages(pages, i);
1049 static struct nfs4_layoutget *
1050 pnfs_alloc_init_layoutget_args(struct inode *ino,
1051 struct nfs_open_context *ctx,
1052 const nfs4_stateid *stateid,
1053 const struct pnfs_layout_range *range,
1056 struct nfs_server *server = pnfs_find_server(ino, ctx);
1057 size_t max_reply_sz = server->pnfs_curr_ld->max_layoutget_response;
1058 size_t max_pages = max_response_pages(server);
1059 struct nfs4_layoutget *lgp;
1061 dprintk("--> %s\n", __func__);
1063 lgp = kzalloc(sizeof(*lgp), gfp_flags);
1068 size_t npages = (max_reply_sz + PAGE_SIZE - 1) >> PAGE_SHIFT;
1069 if (npages < max_pages)
1073 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
1074 if (!lgp->args.layout.pages) {
1078 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
1079 lgp->res.layoutp = &lgp->args.layout;
1081 /* Don't confuse uninitialised result and success */
1082 lgp->res.status = -NFS4ERR_DELAY;
1084 lgp->args.minlength = PAGE_SIZE;
1085 if (lgp->args.minlength > range->length)
1086 lgp->args.minlength = range->length;
1088 loff_t i_size = i_size_read(ino);
1090 if (range->iomode == IOMODE_READ) {
1091 if (range->offset >= i_size)
1092 lgp->args.minlength = 0;
1093 else if (i_size - range->offset < lgp->args.minlength)
1094 lgp->args.minlength = i_size - range->offset;
1097 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
1098 pnfs_copy_range(&lgp->args.range, range);
1099 lgp->args.type = server->pnfs_curr_ld->id;
1100 lgp->args.inode = ino;
1101 lgp->args.ctx = get_nfs_open_context(ctx);
1102 nfs4_stateid_copy(&lgp->args.stateid, stateid);
1103 lgp->gfp_flags = gfp_flags;
1104 lgp->cred = get_cred(ctx->cred);
1108 void pnfs_layoutget_free(struct nfs4_layoutget *lgp)
1110 size_t max_pages = lgp->args.layout.pglen / PAGE_SIZE;
1112 nfs4_free_pages(lgp->args.layout.pages, max_pages);
1113 if (lgp->args.inode)
1114 pnfs_put_layout_hdr(NFS_I(lgp->args.inode)->layout);
1115 put_cred(lgp->cred);
1116 put_nfs_open_context(lgp->args.ctx);
1120 static void pnfs_clear_layoutcommit(struct inode *inode,
1121 struct list_head *head)
1123 struct nfs_inode *nfsi = NFS_I(inode);
1124 struct pnfs_layout_segment *lseg, *tmp;
1126 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1128 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
1129 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
1131 pnfs_lseg_dec_and_remove_zero(lseg, head);
1135 void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
1136 const nfs4_stateid *arg_stateid,
1137 const struct pnfs_layout_range *range,
1138 const nfs4_stateid *stateid)
1140 struct inode *inode = lo->plh_inode;
1143 spin_lock(&inode->i_lock);
1144 if (!pnfs_layout_is_valid(lo) || !arg_stateid ||
1145 !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid))
1148 u32 seq = be32_to_cpu(arg_stateid->seqid);
1150 pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq);
1151 pnfs_free_returned_lsegs(lo, &freeme, range, seq);
1152 pnfs_set_layout_stateid(lo, stateid, true);
1154 pnfs_mark_layout_stateid_invalid(lo, &freeme);
1156 pnfs_clear_layoutreturn_waitbit(lo);
1157 spin_unlock(&inode->i_lock);
1158 pnfs_free_lseg_list(&freeme);
1163 pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo,
1164 nfs4_stateid *stateid,
1165 enum pnfs_iomode *iomode)
1167 /* Serialise LAYOUTGET/LAYOUTRETURN */
1168 if (atomic_read(&lo->plh_outstanding) != 0)
1170 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
1172 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
1173 pnfs_get_layout_hdr(lo);
1174 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
1175 if (stateid != NULL) {
1176 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1177 if (lo->plh_return_seq != 0)
1178 stateid->seqid = cpu_to_be32(lo->plh_return_seq);
1181 *iomode = lo->plh_return_iomode;
1182 pnfs_clear_layoutreturn_info(lo);
1185 if (stateid != NULL)
1186 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1188 *iomode = IOMODE_ANY;
1193 pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args,
1194 struct pnfs_layout_hdr *lo,
1195 const nfs4_stateid *stateid,
1196 enum pnfs_iomode iomode)
1198 struct inode *inode = lo->plh_inode;
1200 args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id;
1201 args->inode = inode;
1202 args->range.iomode = iomode;
1203 args->range.offset = 0;
1204 args->range.length = NFS4_MAX_UINT64;
1206 nfs4_stateid_copy(&args->stateid, stateid);
1210 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, const nfs4_stateid *stateid,
1211 enum pnfs_iomode iomode, bool sync)
1213 struct inode *ino = lo->plh_inode;
1214 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1215 struct nfs4_layoutreturn *lrp;
1218 lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
1219 if (unlikely(lrp == NULL)) {
1221 spin_lock(&ino->i_lock);
1222 pnfs_clear_layoutreturn_waitbit(lo);
1223 spin_unlock(&ino->i_lock);
1224 pnfs_put_layout_hdr(lo);
1228 pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode);
1229 lrp->args.ld_private = &lrp->ld_private;
1230 lrp->clp = NFS_SERVER(ino)->nfs_client;
1231 lrp->cred = lo->plh_lc_cred;
1232 if (ld->prepare_layoutreturn)
1233 ld->prepare_layoutreturn(&lrp->args);
1235 status = nfs4_proc_layoutreturn(lrp, sync);
1237 dprintk("<-- %s status: %d\n", __func__, status);
1242 pnfs_layout_segments_returnable(struct pnfs_layout_hdr *lo,
1243 enum pnfs_iomode iomode,
1246 struct pnfs_layout_range recall_range = {
1247 .length = NFS4_MAX_UINT64,
1250 return pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs,
1251 &recall_range, seq) != -EBUSY;
1254 /* Return true if layoutreturn is needed */
1256 pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
1258 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1260 return pnfs_layout_segments_returnable(lo, lo->plh_return_iomode,
1261 lo->plh_return_seq);
1264 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo)
1266 struct inode *inode= lo->plh_inode;
1268 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1270 spin_lock(&inode->i_lock);
1271 if (pnfs_layout_need_return(lo)) {
1272 nfs4_stateid stateid;
1273 enum pnfs_iomode iomode;
1276 send = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
1277 spin_unlock(&inode->i_lock);
1279 /* Send an async layoutreturn so we dont deadlock */
1280 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
1283 spin_unlock(&inode->i_lock);
1287 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
1288 * when the layout segment list is empty.
1290 * Note that a pnfs_layout_hdr can exist with an empty layout segment
1291 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
1292 * deviceid is marked invalid.
1295 _pnfs_return_layout(struct inode *ino)
1297 struct pnfs_layout_hdr *lo = NULL;
1298 struct nfs_inode *nfsi = NFS_I(ino);
1299 struct pnfs_layout_range range = {
1300 .iomode = IOMODE_ANY,
1302 .length = NFS4_MAX_UINT64,
1304 LIST_HEAD(tmp_list);
1305 nfs4_stateid stateid;
1307 bool send, valid_layout;
1309 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
1311 spin_lock(&ino->i_lock);
1314 spin_unlock(&ino->i_lock);
1315 dprintk("NFS: %s no layout to return\n", __func__);
1318 /* Reference matched in nfs4_layoutreturn_release */
1319 pnfs_get_layout_hdr(lo);
1320 /* Is there an outstanding layoutreturn ? */
1321 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1322 spin_unlock(&ino->i_lock);
1323 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1324 TASK_UNINTERRUPTIBLE))
1325 goto out_put_layout_hdr;
1326 spin_lock(&ino->i_lock);
1328 valid_layout = pnfs_layout_is_valid(lo);
1329 pnfs_clear_layoutcommit(ino, &tmp_list);
1330 pnfs_mark_matching_lsegs_return(lo, &tmp_list, &range, 0);
1332 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range)
1333 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
1335 /* Don't send a LAYOUTRETURN if list was initially empty */
1336 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) ||
1338 spin_unlock(&ino->i_lock);
1339 dprintk("NFS: %s no layout segments to return\n", __func__);
1340 goto out_put_layout_hdr;
1343 send = pnfs_prepare_layoutreturn(lo, &stateid, NULL);
1344 spin_unlock(&ino->i_lock);
1346 status = pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true);
1348 pnfs_free_lseg_list(&tmp_list);
1349 pnfs_put_layout_hdr(lo);
1351 dprintk("<-- %s status: %d\n", __func__, status);
1356 pnfs_commit_and_return_layout(struct inode *inode)
1358 struct pnfs_layout_hdr *lo;
1361 spin_lock(&inode->i_lock);
1362 lo = NFS_I(inode)->layout;
1364 spin_unlock(&inode->i_lock);
1367 pnfs_get_layout_hdr(lo);
1368 /* Block new layoutgets and read/write to ds */
1369 lo->plh_block_lgets++;
1370 spin_unlock(&inode->i_lock);
1371 filemap_fdatawait(inode->i_mapping);
1372 ret = pnfs_layoutcommit_inode(inode, true);
1374 ret = _pnfs_return_layout(inode);
1375 spin_lock(&inode->i_lock);
1376 lo->plh_block_lgets--;
1377 spin_unlock(&inode->i_lock);
1378 pnfs_put_layout_hdr(lo);
1382 bool pnfs_roc(struct inode *ino,
1383 struct nfs4_layoutreturn_args *args,
1384 struct nfs4_layoutreturn_res *res,
1385 const struct cred *cred)
1387 struct nfs_inode *nfsi = NFS_I(ino);
1388 struct nfs_open_context *ctx;
1389 struct nfs4_state *state;
1390 struct pnfs_layout_hdr *lo;
1391 struct pnfs_layout_segment *lseg, *next;
1392 nfs4_stateid stateid;
1393 enum pnfs_iomode iomode = 0;
1394 bool layoutreturn = false, roc = false;
1395 bool skip_read = false;
1397 if (!nfs_have_layout(ino))
1401 spin_lock(&ino->i_lock);
1403 if (!lo || !pnfs_layout_is_valid(lo) ||
1404 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1408 pnfs_get_layout_hdr(lo);
1409 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1410 spin_unlock(&ino->i_lock);
1412 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1413 TASK_UNINTERRUPTIBLE);
1414 pnfs_put_layout_hdr(lo);
1418 /* no roc if we hold a delegation */
1419 if (nfs4_check_delegation(ino, FMODE_READ)) {
1420 if (nfs4_check_delegation(ino, FMODE_WRITE))
1425 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1429 /* Don't return layout if there is open file state */
1430 if (state->state & FMODE_WRITE)
1432 if (state->state & FMODE_READ)
1437 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) {
1438 if (skip_read && lseg->pls_range.iomode == IOMODE_READ)
1440 /* If we are sending layoutreturn, invalidate all valid lsegs */
1441 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags))
1444 * Note: mark lseg for return so pnfs_layout_remove_lseg
1445 * doesn't invalidate the layout for us.
1447 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1448 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs))
1450 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
1453 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1456 /* ROC in two conditions:
1457 * 1. there are ROC lsegs
1458 * 2. we don't send layoutreturn
1460 /* lo ref dropped in pnfs_roc_release() */
1461 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
1462 /* If the creds don't match, we can't compound the layoutreturn */
1463 if (!layoutreturn || cred_fscmp(cred, lo->plh_lc_cred) != 0)
1467 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode);
1468 res->lrs_present = 0;
1469 layoutreturn = false;
1472 spin_unlock(&ino->i_lock);
1474 pnfs_layoutcommit_inode(ino, true);
1476 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1477 if (ld->prepare_layoutreturn)
1478 ld->prepare_layoutreturn(args);
1479 pnfs_put_layout_hdr(lo);
1483 pnfs_send_layoutreturn(lo, &stateid, iomode, true);
1484 pnfs_put_layout_hdr(lo);
1488 int pnfs_roc_done(struct rpc_task *task, struct nfs4_layoutreturn_args **argpp,
1489 struct nfs4_layoutreturn_res **respp, int *ret)
1491 struct nfs4_layoutreturn_args *arg = *argpp;
1492 int retval = -EAGAIN;
1496 /* Handle Layoutreturn errors */
1501 case -NFS4ERR_NOMATCHING_LAYOUT:
1502 /* Was there an RPC level error? If not, retry */
1503 if (task->tk_rpc_status == 0)
1505 /* If the call was not sent, let caller handle it */
1506 if (!RPC_WAS_SENT(task))
1509 * Otherwise, assume the call succeeded and
1510 * that we need to release the layout
1513 (*respp)->lrs_present = 0;
1516 case -NFS4ERR_DELAY:
1517 /* Let the caller handle the retry */
1518 *ret = -NFS4ERR_NOMATCHING_LAYOUT;
1520 case -NFS4ERR_OLD_STATEID:
1521 if (!nfs4_layout_refresh_old_stateid(&arg->stateid,
1522 &arg->range, arg->inode))
1524 *ret = -NFS4ERR_NOMATCHING_LAYOUT;
1532 void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
1533 struct nfs4_layoutreturn_res *res,
1536 struct pnfs_layout_hdr *lo = args->layout;
1537 struct inode *inode = args->inode;
1538 const nfs4_stateid *arg_stateid = NULL;
1539 const nfs4_stateid *res_stateid = NULL;
1540 struct nfs4_xdr_opaque_data *ld_private = args->ld_private;
1543 case -NFS4ERR_NOMATCHING_LAYOUT:
1544 spin_lock(&inode->i_lock);
1545 if (pnfs_layout_is_valid(lo) &&
1546 nfs4_stateid_match_other(&args->stateid, &lo->plh_stateid))
1547 pnfs_set_plh_return_info(lo, args->range.iomode, 0);
1548 spin_unlock(&inode->i_lock);
1551 if (res->lrs_present)
1552 res_stateid = &res->stateid;
1555 arg_stateid = &args->stateid;
1557 pnfs_layoutreturn_free_lsegs(lo, arg_stateid, &args->range,
1559 if (ld_private && ld_private->ops && ld_private->ops->free)
1560 ld_private->ops->free(ld_private);
1561 pnfs_put_layout_hdr(lo);
1562 trace_nfs4_layoutreturn_on_close(args->inode, 0);
1565 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1567 struct nfs_inode *nfsi = NFS_I(ino);
1568 struct pnfs_layout_hdr *lo;
1571 /* we might not have grabbed lo reference. so need to check under
1573 spin_lock(&ino->i_lock);
1575 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1576 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
1579 spin_unlock(&ino->i_lock);
1584 * Compare two layout segments for sorting into layout cache.
1585 * We want to preferentially return RW over RO layouts, so ensure those
1589 pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1590 const struct pnfs_layout_range *l2)
1594 /* high offset > low offset */
1595 d = l1->offset - l2->offset;
1599 /* short length > long length */
1600 d = l2->length - l1->length;
1604 /* read > read/write */
1605 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1609 pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1610 const struct pnfs_layout_range *l2)
1612 return pnfs_lseg_range_cmp(l1, l2) > 0;
1616 pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1617 struct pnfs_layout_segment *old)
1623 pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1624 struct pnfs_layout_segment *lseg,
1625 bool (*is_after)(const struct pnfs_layout_range *,
1626 const struct pnfs_layout_range *),
1627 bool (*do_merge)(struct pnfs_layout_segment *,
1628 struct pnfs_layout_segment *),
1629 struct list_head *free_me)
1631 struct pnfs_layout_segment *lp, *tmp;
1633 dprintk("%s:Begin\n", __func__);
1635 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1636 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1638 if (do_merge(lseg, lp)) {
1639 mark_lseg_invalid(lp, free_me);
1642 if (is_after(&lseg->pls_range, &lp->pls_range))
1644 list_add_tail(&lseg->pls_list, &lp->pls_list);
1645 dprintk("%s: inserted lseg %p "
1646 "iomode %d offset %llu length %llu before "
1647 "lp %p iomode %d offset %llu length %llu\n",
1648 __func__, lseg, lseg->pls_range.iomode,
1649 lseg->pls_range.offset, lseg->pls_range.length,
1650 lp, lp->pls_range.iomode, lp->pls_range.offset,
1651 lp->pls_range.length);
1654 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1655 dprintk("%s: inserted lseg %p "
1656 "iomode %d offset %llu length %llu at tail\n",
1657 __func__, lseg, lseg->pls_range.iomode,
1658 lseg->pls_range.offset, lseg->pls_range.length);
1660 pnfs_get_layout_hdr(lo);
1662 dprintk("%s:Return\n", __func__);
1664 EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1667 pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1668 struct pnfs_layout_segment *lseg,
1669 struct list_head *free_me)
1671 struct inode *inode = lo->plh_inode;
1672 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1674 if (ld->add_lseg != NULL)
1675 ld->add_lseg(lo, lseg, free_me);
1677 pnfs_generic_layout_insert_lseg(lo, lseg,
1678 pnfs_lseg_range_is_after,
1683 static struct pnfs_layout_hdr *
1684 alloc_init_layout_hdr(struct inode *ino,
1685 struct nfs_open_context *ctx,
1688 struct pnfs_layout_hdr *lo;
1690 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1693 refcount_set(&lo->plh_refcount, 1);
1694 INIT_LIST_HEAD(&lo->plh_layouts);
1695 INIT_LIST_HEAD(&lo->plh_segs);
1696 INIT_LIST_HEAD(&lo->plh_return_segs);
1697 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1698 lo->plh_inode = ino;
1699 lo->plh_lc_cred = get_cred(ctx->cred);
1700 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID;
1704 static struct pnfs_layout_hdr *
1705 pnfs_find_alloc_layout(struct inode *ino,
1706 struct nfs_open_context *ctx,
1708 __releases(&ino->i_lock)
1709 __acquires(&ino->i_lock)
1711 struct nfs_inode *nfsi = NFS_I(ino);
1712 struct pnfs_layout_hdr *new = NULL;
1714 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1716 if (nfsi->layout != NULL)
1718 spin_unlock(&ino->i_lock);
1719 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1720 spin_lock(&ino->i_lock);
1722 if (likely(nfsi->layout == NULL)) { /* Won the race? */
1725 } else if (new != NULL)
1726 pnfs_free_layout_hdr(new);
1728 pnfs_get_layout_hdr(nfsi->layout);
1729 return nfsi->layout;
1733 * iomode matching rules:
1734 * iomode lseg strict match
1736 * ----- ----- ------ -----
1741 * READ READ N/A true
1742 * READ RW true false
1743 * READ RW false true
1746 pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1747 const struct pnfs_layout_range *range,
1750 struct pnfs_layout_range range1;
1752 if ((range->iomode == IOMODE_RW &&
1753 ls_range->iomode != IOMODE_RW) ||
1754 (range->iomode != ls_range->iomode &&
1756 !pnfs_lseg_range_intersecting(ls_range, range))
1759 /* range1 covers only the first byte in the range */
1762 return pnfs_lseg_range_contained(ls_range, &range1);
1766 * lookup range in layout
1768 static struct pnfs_layout_segment *
1769 pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1770 struct pnfs_layout_range *range,
1773 struct pnfs_layout_segment *lseg, *ret = NULL;
1775 dprintk("%s:Begin\n", __func__);
1777 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1778 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1779 pnfs_lseg_range_match(&lseg->pls_range, range,
1781 ret = pnfs_get_lseg(lseg);
1786 dprintk("%s:Return lseg %p ref %d\n",
1787 __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0);
1792 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1793 * to the MDS or over pNFS
1795 * The nfs_inode read_io and write_io fields are cumulative counters reset
1796 * when there are no layout segments. Note that in pnfs_update_layout iomode
1797 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1800 * A return of true means use MDS I/O.
1803 * If a file's size is smaller than the file size threshold, data accesses
1804 * SHOULD be sent to the metadata server. If an I/O request has a length that
1805 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1806 * server. If both file size and I/O size are provided, the client SHOULD
1807 * reach or exceed both thresholds before sending its read or write
1808 * requests to the data server.
1810 static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1811 struct inode *ino, int iomode)
1813 struct nfs4_threshold *t = ctx->mdsthreshold;
1814 struct nfs_inode *nfsi = NFS_I(ino);
1815 loff_t fsize = i_size_read(ino);
1816 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1821 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1822 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1826 if (t->bm & THRESHOLD_RD) {
1827 dprintk("%s fsize %llu\n", __func__, fsize);
1829 if (fsize < t->rd_sz)
1832 if (t->bm & THRESHOLD_RD_IO) {
1833 dprintk("%s nfsi->read_io %llu\n", __func__,
1836 if (nfsi->read_io < t->rd_io_sz)
1841 if (t->bm & THRESHOLD_WR) {
1842 dprintk("%s fsize %llu\n", __func__, fsize);
1844 if (fsize < t->wr_sz)
1847 if (t->bm & THRESHOLD_WR_IO) {
1848 dprintk("%s nfsi->write_io %llu\n", __func__,
1851 if (nfsi->write_io < t->wr_io_sz)
1856 if (size_set && io_set) {
1859 } else if (size || io)
1862 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1866 static int pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
1869 * send layoutcommit as it can hold up layoutreturn due to lseg
1872 pnfs_layoutcommit_inode(lo->plh_inode, false);
1873 return wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
1874 nfs_wait_bit_killable,
1878 static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo)
1880 atomic_inc(&lo->plh_outstanding);
1883 static void nfs_layoutget_end(struct pnfs_layout_hdr *lo)
1885 if (atomic_dec_and_test(&lo->plh_outstanding))
1886 wake_up_var(&lo->plh_outstanding);
1889 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1891 unsigned long *bitlock = &lo->plh_flags;
1893 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1894 smp_mb__after_atomic();
1895 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1898 static void _add_to_server_list(struct pnfs_layout_hdr *lo,
1899 struct nfs_server *server)
1901 if (list_empty(&lo->plh_layouts)) {
1902 struct nfs_client *clp = server->nfs_client;
1904 /* The lo must be on the clp list if there is any
1905 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1907 spin_lock(&clp->cl_lock);
1908 if (list_empty(&lo->plh_layouts))
1909 list_add_tail(&lo->plh_layouts, &server->layouts);
1910 spin_unlock(&clp->cl_lock);
1915 * Layout segment is retreived from the server if not cached.
1916 * The appropriate layout segment is referenced and returned to the caller.
1918 struct pnfs_layout_segment *
1919 pnfs_update_layout(struct inode *ino,
1920 struct nfs_open_context *ctx,
1923 enum pnfs_iomode iomode,
1927 struct pnfs_layout_range arg = {
1933 struct nfs_server *server = NFS_SERVER(ino);
1934 struct nfs_client *clp = server->nfs_client;
1935 struct pnfs_layout_hdr *lo = NULL;
1936 struct pnfs_layout_segment *lseg = NULL;
1937 struct nfs4_layoutget *lgp;
1938 nfs4_stateid stateid;
1940 unsigned long giveup = jiffies + (clp->cl_lease_time << 1);
1943 if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
1944 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1945 PNFS_UPDATE_LAYOUT_NO_PNFS);
1949 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
1950 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1951 PNFS_UPDATE_LAYOUT_MDSTHRESH);
1956 lseg = ERR_PTR(nfs4_client_recover_expired_lease(clp));
1960 spin_lock(&ino->i_lock);
1961 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1963 spin_unlock(&ino->i_lock);
1964 lseg = ERR_PTR(-ENOMEM);
1965 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1966 PNFS_UPDATE_LAYOUT_NOMEM);
1970 /* Do we even need to bother with this? */
1971 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1972 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1973 PNFS_UPDATE_LAYOUT_BULK_RECALL);
1974 dprintk("%s matches recall, use MDS\n", __func__);
1978 /* if LAYOUTGET already failed once we don't try again */
1979 if (pnfs_layout_io_test_failed(lo, iomode)) {
1980 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1981 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
1986 * If the layout segment list is empty, but there are outstanding
1987 * layoutget calls, then they might be subject to a layoutrecall.
1989 if (list_empty(&lo->plh_segs) &&
1990 atomic_read(&lo->plh_outstanding) != 0) {
1991 spin_unlock(&ino->i_lock);
1992 lseg = ERR_PTR(wait_var_event_killable(&lo->plh_outstanding,
1993 !atomic_read(&lo->plh_outstanding)));
1995 goto out_put_layout_hdr;
1996 pnfs_put_layout_hdr(lo);
2001 * Because we free lsegs when sending LAYOUTRETURN, we need to wait
2004 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
2005 spin_unlock(&ino->i_lock);
2006 dprintk("%s wait for layoutreturn\n", __func__);
2007 lseg = ERR_PTR(pnfs_prepare_to_retry_layoutget(lo));
2008 if (!IS_ERR(lseg)) {
2009 pnfs_put_layout_hdr(lo);
2010 dprintk("%s retrying\n", __func__);
2011 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
2013 PNFS_UPDATE_LAYOUT_RETRY);
2016 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2017 PNFS_UPDATE_LAYOUT_RETURN);
2018 goto out_put_layout_hdr;
2021 lseg = pnfs_find_lseg(lo, &arg, strict_iomode);
2023 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2024 PNFS_UPDATE_LAYOUT_FOUND_CACHED);
2029 * Choose a stateid for the LAYOUTGET. If we don't have a layout
2030 * stateid, or it has been invalidated, then we must use the open
2033 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
2037 * The first layoutget for the file. Need to serialize per
2038 * RFC 5661 Errata 3208.
2040 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
2042 spin_unlock(&ino->i_lock);
2043 lseg = ERR_PTR(wait_on_bit(&lo->plh_flags,
2044 NFS_LAYOUT_FIRST_LAYOUTGET,
2047 goto out_put_layout_hdr;
2048 pnfs_put_layout_hdr(lo);
2049 dprintk("%s retrying\n", __func__);
2054 status = nfs4_select_rw_stateid(ctx->state,
2055 iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ,
2056 NULL, &stateid, NULL);
2058 lseg = ERR_PTR(status);
2059 trace_pnfs_update_layout(ino, pos, count,
2061 PNFS_UPDATE_LAYOUT_INVALID_OPEN);
2062 if (status != -EAGAIN)
2064 spin_unlock(&ino->i_lock);
2065 nfs4_schedule_stateid_recovery(server, ctx->state);
2066 pnfs_clear_first_layoutget(lo);
2067 pnfs_put_layout_hdr(lo);
2071 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
2074 if (pnfs_layoutgets_blocked(lo)) {
2075 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2076 PNFS_UPDATE_LAYOUT_BLOCKED);
2079 nfs_layoutget_begin(lo);
2080 spin_unlock(&ino->i_lock);
2082 _add_to_server_list(lo, server);
2084 pg_offset = arg.offset & ~PAGE_MASK;
2086 arg.offset -= pg_offset;
2087 arg.length += pg_offset;
2089 if (arg.length != NFS4_MAX_UINT64)
2090 arg.length = PAGE_ALIGN(arg.length);
2092 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &stateid, &arg, gfp_flags);
2094 lseg = ERR_PTR(-ENOMEM);
2095 trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL,
2096 PNFS_UPDATE_LAYOUT_NOMEM);
2097 nfs_layoutget_end(lo);
2098 goto out_put_layout_hdr;
2101 lseg = nfs4_proc_layoutget(lgp, &timeout);
2102 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2103 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
2104 nfs_layoutget_end(lo);
2106 switch(PTR_ERR(lseg)) {
2108 if (time_after(jiffies, giveup))
2111 case -ERECALLCONFLICT:
2115 /* The server returned NFS4ERR_LAYOUTUNAVAILABLE */
2116 pnfs_layout_set_fail_bit(
2117 lo, pnfs_iomode_to_fail_bit(iomode));
2119 goto out_put_layout_hdr;
2121 if (!nfs_error_is_fatal(PTR_ERR(lseg))) {
2122 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2125 goto out_put_layout_hdr;
2129 pnfs_clear_first_layoutget(lo);
2130 trace_pnfs_update_layout(ino, pos, count,
2131 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY);
2132 pnfs_put_layout_hdr(lo);
2136 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2141 pnfs_clear_first_layoutget(lo);
2142 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2143 PNFS_UPDATE_LAYOUT_EXIT);
2144 pnfs_put_layout_hdr(lo);
2146 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
2147 "(%s, offset: %llu, length: %llu)\n",
2148 __func__, ino->i_sb->s_id,
2149 (unsigned long long)NFS_FILEID(ino),
2150 IS_ERR_OR_NULL(lseg) ? "not found" : "found",
2151 iomode==IOMODE_RW ? "read/write" : "read-only",
2152 (unsigned long long)pos,
2153 (unsigned long long)count);
2156 spin_unlock(&ino->i_lock);
2157 goto out_put_layout_hdr;
2159 EXPORT_SYMBOL_GPL(pnfs_update_layout);
2162 pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
2164 switch (range->iomode) {
2171 if (range->offset == NFS4_MAX_UINT64)
2173 if (range->length == 0)
2175 if (range->length != NFS4_MAX_UINT64 &&
2176 range->length > NFS4_MAX_UINT64 - range->offset)
2181 static struct pnfs_layout_hdr *
2182 _pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx)
2184 struct pnfs_layout_hdr *lo;
2186 spin_lock(&ino->i_lock);
2187 lo = pnfs_find_alloc_layout(ino, ctx, GFP_KERNEL);
2190 if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags))
2192 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
2194 if (pnfs_layoutgets_blocked(lo))
2196 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags))
2198 nfs_layoutget_begin(lo);
2199 spin_unlock(&ino->i_lock);
2200 _add_to_server_list(lo, NFS_SERVER(ino));
2204 spin_unlock(&ino->i_lock);
2205 pnfs_put_layout_hdr(lo);
2209 extern const nfs4_stateid current_stateid;
2211 static void _lgopen_prepare_attached(struct nfs4_opendata *data,
2212 struct nfs_open_context *ctx)
2214 struct inode *ino = data->dentry->d_inode;
2215 struct pnfs_layout_range rng = {
2216 .iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2217 IOMODE_RW: IOMODE_READ,
2219 .length = NFS4_MAX_UINT64,
2221 struct nfs4_layoutget *lgp;
2222 struct pnfs_layout_hdr *lo;
2224 /* Heuristic: don't send layoutget if we have cached data */
2225 if (rng.iomode == IOMODE_READ &&
2226 (i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0))
2229 lo = _pnfs_grab_empty_layout(ino, ctx);
2232 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid,
2235 pnfs_clear_first_layoutget(lo);
2236 nfs_layoutget_end(lo);
2237 pnfs_put_layout_hdr(lo);
2241 data->o_arg.lg_args = &lgp->args;
2242 data->o_res.lg_res = &lgp->res;
2245 static void _lgopen_prepare_floating(struct nfs4_opendata *data,
2246 struct nfs_open_context *ctx)
2248 struct pnfs_layout_range rng = {
2249 .iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2250 IOMODE_RW: IOMODE_READ,
2252 .length = NFS4_MAX_UINT64,
2254 struct nfs4_layoutget *lgp;
2256 lgp = pnfs_alloc_init_layoutget_args(NULL, ctx, ¤t_stateid,
2261 data->o_arg.lg_args = &lgp->args;
2262 data->o_res.lg_res = &lgp->res;
2265 void pnfs_lgopen_prepare(struct nfs4_opendata *data,
2266 struct nfs_open_context *ctx)
2268 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
2270 if (!(pnfs_enabled_sb(server) &&
2271 server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN))
2273 /* Could check on max_ops, but currently hardcoded high enough */
2274 if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN))
2277 _lgopen_prepare_attached(data, ctx);
2279 _lgopen_prepare_floating(data, ctx);
2282 void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
2283 struct nfs_open_context *ctx)
2285 struct pnfs_layout_hdr *lo;
2286 struct pnfs_layout_segment *lseg;
2287 struct nfs_server *srv = NFS_SERVER(ino);
2292 dprintk("%s: entered with status %i\n", __func__, lgp->res.status);
2293 if (lgp->res.status) {
2294 switch (lgp->res.status) {
2298 * Halt lgopen attempts if the server doesn't recognise
2299 * the "current stateid" value, the layout type, or the
2300 * layoutget operation as being valid.
2301 * Also if it complains about too many ops in the compound
2302 * or of the request/reply being too big.
2304 case -NFS4ERR_BAD_STATEID:
2305 case -NFS4ERR_NOTSUPP:
2306 case -NFS4ERR_REP_TOO_BIG:
2307 case -NFS4ERR_REP_TOO_BIG_TO_CACHE:
2308 case -NFS4ERR_REQ_TOO_BIG:
2309 case -NFS4ERR_TOO_MANY_OPS:
2310 case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
2311 srv->caps &= ~NFS_CAP_LGOPEN;
2315 if (!lgp->args.inode) {
2316 lo = _pnfs_grab_empty_layout(ino, ctx);
2319 lgp->args.inode = ino;
2321 lo = NFS_I(lgp->args.inode)->layout;
2323 lseg = pnfs_layout_process(lgp);
2324 if (!IS_ERR(lseg)) {
2325 iomode = lgp->args.range.iomode;
2326 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2327 pnfs_put_lseg(lseg);
2331 void nfs4_lgopen_release(struct nfs4_layoutget *lgp)
2334 struct inode *inode = lgp->args.inode;
2336 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
2337 pnfs_clear_first_layoutget(lo);
2338 nfs_layoutget_end(lo);
2340 pnfs_layoutget_free(lgp);
2344 struct pnfs_layout_segment *
2345 pnfs_layout_process(struct nfs4_layoutget *lgp)
2347 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
2348 struct nfs4_layoutget_res *res = &lgp->res;
2349 struct pnfs_layout_segment *lseg;
2350 struct inode *ino = lo->plh_inode;
2353 if (!pnfs_sanity_check_layout_range(&res->range))
2354 return ERR_PTR(-EINVAL);
2356 /* Inject layout blob into I/O device driver */
2357 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
2358 if (IS_ERR_OR_NULL(lseg)) {
2360 lseg = ERR_PTR(-ENOMEM);
2362 dprintk("%s: Could not allocate layout: error %ld\n",
2363 __func__, PTR_ERR(lseg));
2367 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid);
2369 spin_lock(&ino->i_lock);
2370 if (pnfs_layoutgets_blocked(lo)) {
2371 dprintk("%s forget reply due to state\n", __func__);
2375 if (!pnfs_layout_is_valid(lo)) {
2376 /* We have a completely new layout */
2377 pnfs_set_layout_stateid(lo, &res->stateid, true);
2378 } else if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
2379 /* existing state ID, make sure the sequence number matches. */
2380 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
2381 dprintk("%s forget reply due to sequence\n", __func__);
2384 pnfs_set_layout_stateid(lo, &res->stateid, false);
2387 * We got an entirely new state ID. Mark all segments for the
2388 * inode invalid, and retry the layoutget
2390 struct pnfs_layout_range range = {
2391 .iomode = IOMODE_ANY,
2392 .length = NFS4_MAX_UINT64,
2394 pnfs_set_plh_return_info(lo, IOMODE_ANY, 0);
2395 pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs,
2400 pnfs_get_lseg(lseg);
2401 pnfs_layout_insert_lseg(lo, lseg, &free_me);
2404 if (res->return_on_close)
2405 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
2407 spin_unlock(&ino->i_lock);
2408 pnfs_free_lseg_list(&free_me);
2412 spin_unlock(&ino->i_lock);
2413 lseg->pls_layout = lo;
2414 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
2415 pnfs_free_lseg_list(&free_me);
2416 return ERR_PTR(-EAGAIN);
2420 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
2421 * @lo: pointer to layout header
2422 * @tmp_list: list header to be used with pnfs_free_lseg_list()
2423 * @return_range: describe layout segment ranges to be returned
2424 * @seq: stateid seqid to match
2426 * This function is mainly intended for use by layoutrecall. It attempts
2427 * to free the layout segment immediately, or else to mark it for return
2428 * as soon as its reference count drops to zero.
2431 * - 0: a layoutreturn needs to be scheduled.
2432 * - EBUSY: there are layout segment that are still in use.
2433 * - ENOENT: there are no layout segments that need to be returned.
2436 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
2437 struct list_head *tmp_list,
2438 const struct pnfs_layout_range *return_range,
2441 struct pnfs_layout_segment *lseg, *next;
2444 dprintk("%s:Begin lo %p\n", __func__, lo);
2446 assert_spin_locked(&lo->plh_inode->i_lock);
2448 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
2449 tmp_list = &lo->plh_return_segs;
2451 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
2452 if (pnfs_match_lseg_recall(lseg, return_range, seq)) {
2453 dprintk("%s: marking lseg %p iomode %d "
2454 "offset %llu length %llu\n", __func__,
2455 lseg, lseg->pls_range.iomode,
2456 lseg->pls_range.offset,
2457 lseg->pls_range.length);
2458 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
2459 tmp_list = &lo->plh_return_segs;
2460 if (mark_lseg_invalid(lseg, tmp_list))
2463 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
2467 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2471 if (!list_empty(&lo->plh_return_segs)) {
2472 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2479 void pnfs_error_mark_layout_for_return(struct inode *inode,
2480 struct pnfs_layout_segment *lseg)
2482 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
2483 struct pnfs_layout_range range = {
2484 .iomode = lseg->pls_range.iomode,
2486 .length = NFS4_MAX_UINT64,
2488 bool return_now = false;
2490 spin_lock(&inode->i_lock);
2491 if (!pnfs_layout_is_valid(lo)) {
2492 spin_unlock(&inode->i_lock);
2495 pnfs_set_plh_return_info(lo, range.iomode, 0);
2497 * mark all matching lsegs so that we are sure to have no live
2498 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
2501 if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, &range, 0) != -EBUSY) {
2502 nfs4_stateid stateid;
2503 enum pnfs_iomode iomode;
2505 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
2506 spin_unlock(&inode->i_lock);
2508 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
2510 spin_unlock(&inode->i_lock);
2511 nfs_commit_inode(inode, 0);
2514 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
2517 pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio)
2519 if (pgio->pg_lseg == NULL ||
2520 test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags))
2522 pnfs_put_lseg(pgio->pg_lseg);
2523 pgio->pg_lseg = NULL;
2525 EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout);
2528 * Check for any intersection between the request and the pgio->pg_lseg,
2529 * and if none, put this pgio->pg_lseg away.
2532 pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2534 if (pgio->pg_lseg && !pnfs_lseg_request_intersecting(pgio->pg_lseg, req)) {
2535 pnfs_put_lseg(pgio->pg_lseg);
2536 pgio->pg_lseg = NULL;
2541 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2543 u64 rd_size = req->wb_bytes;
2545 pnfs_generic_pg_check_layout(pgio);
2546 pnfs_generic_pg_check_range(pgio, req);
2547 if (pgio->pg_lseg == NULL) {
2548 if (pgio->pg_dreq == NULL)
2549 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
2551 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
2553 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2554 nfs_req_openctx(req),
2560 if (IS_ERR(pgio->pg_lseg)) {
2561 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2562 pgio->pg_lseg = NULL;
2566 /* If no lseg, fall back to read through mds */
2567 if (pgio->pg_lseg == NULL)
2568 nfs_pageio_reset_read_mds(pgio);
2571 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
2574 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
2575 struct nfs_page *req, u64 wb_size)
2577 pnfs_generic_pg_check_layout(pgio);
2578 pnfs_generic_pg_check_range(pgio, req);
2579 if (pgio->pg_lseg == NULL) {
2580 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2581 nfs_req_openctx(req),
2587 if (IS_ERR(pgio->pg_lseg)) {
2588 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2589 pgio->pg_lseg = NULL;
2593 /* If no lseg, fall back to write through mds */
2594 if (pgio->pg_lseg == NULL)
2595 nfs_pageio_reset_write_mds(pgio);
2597 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
2600 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
2602 if (desc->pg_lseg) {
2603 pnfs_put_lseg(desc->pg_lseg);
2604 desc->pg_lseg = NULL;
2607 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
2610 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
2611 * of bytes (maximum @req->wb_bytes) that can be coalesced.
2614 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
2615 struct nfs_page *prev, struct nfs_page *req)
2618 u64 seg_end, req_start, seg_left;
2620 size = nfs_generic_pg_test(pgio, prev, req);
2625 * 'size' contains the number of bytes left in the current page (up
2626 * to the original size asked for in @req->wb_bytes).
2628 * Calculate how many bytes are left in the layout segment
2629 * and if there are less bytes than 'size', return that instead.
2631 * Please also note that 'end_offset' is actually the offset of the
2632 * first byte that lies outside the pnfs_layout_range. FIXME?
2635 if (pgio->pg_lseg) {
2636 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset,
2637 pgio->pg_lseg->pls_range.length);
2638 req_start = req_offset(req);
2640 /* start of request is past the last byte of this segment */
2641 if (req_start >= seg_end)
2644 /* adjust 'size' iff there are fewer bytes left in the
2645 * segment than what nfs_generic_pg_test returned */
2646 seg_left = seg_end - req_start;
2647 if (seg_left < size)
2648 size = (unsigned int)seg_left;
2653 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
2655 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
2657 struct nfs_pageio_descriptor pgio;
2659 /* Resend all requests through the MDS */
2660 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
2661 hdr->completion_ops);
2662 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
2663 return nfs_pageio_resend(&pgio, hdr);
2665 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
2667 static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
2670 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
2671 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2672 PNFS_LAYOUTRET_ON_ERROR) {
2673 pnfs_return_layout(hdr->inode);
2675 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2676 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
2680 * Called by non rpc-based layout drivers
2682 void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
2684 if (likely(!hdr->pnfs_error)) {
2685 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
2686 hdr->mds_offset + hdr->res.count);
2687 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2689 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
2690 if (unlikely(hdr->pnfs_error))
2691 pnfs_ld_handle_write_error(hdr);
2692 hdr->mds_ops->rpc_release(hdr);
2694 EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
2697 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
2698 struct nfs_pgio_header *hdr)
2700 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2702 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2703 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2704 nfs_pageio_reset_write_mds(desc);
2705 mirror->pg_recoalesce = 1;
2707 hdr->completion_ops->completion(hdr);
2710 static enum pnfs_try_status
2711 pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
2712 const struct rpc_call_ops *call_ops,
2713 struct pnfs_layout_segment *lseg,
2716 struct inode *inode = hdr->inode;
2717 enum pnfs_try_status trypnfs;
2718 struct nfs_server *nfss = NFS_SERVER(inode);
2720 hdr->mds_ops = call_ops;
2722 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
2723 inode->i_ino, hdr->args.count, hdr->args.offset, how);
2724 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
2725 if (trypnfs != PNFS_NOT_ATTEMPTED)
2726 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
2727 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2732 pnfs_do_write(struct nfs_pageio_descriptor *desc,
2733 struct nfs_pgio_header *hdr, int how)
2735 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2736 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2737 enum pnfs_try_status trypnfs;
2739 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
2741 case PNFS_NOT_ATTEMPTED:
2742 pnfs_write_through_mds(desc, hdr);
2743 case PNFS_ATTEMPTED:
2745 case PNFS_TRY_AGAIN:
2746 /* cleanup hdr and prepare to redo pnfs */
2747 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2748 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2749 list_splice_init(&hdr->pages, &mirror->pg_list);
2750 mirror->pg_recoalesce = 1;
2752 hdr->mds_ops->rpc_release(hdr);
2756 static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
2758 pnfs_put_lseg(hdr->lseg);
2759 nfs_pgio_header_free(hdr);
2763 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
2765 struct nfs_pgio_header *hdr;
2768 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2770 desc->pg_error = -ENOMEM;
2771 return desc->pg_error;
2773 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
2775 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2776 ret = nfs_generic_pgio(desc, hdr);
2778 pnfs_do_write(desc, hdr, desc->pg_ioflags);
2782 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
2784 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
2786 struct nfs_pageio_descriptor pgio;
2788 /* Resend all requests through the MDS */
2789 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
2790 return nfs_pageio_resend(&pgio, hdr);
2792 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
2794 static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
2796 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
2797 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2798 PNFS_LAYOUTRET_ON_ERROR) {
2799 pnfs_return_layout(hdr->inode);
2801 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2802 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2806 * Called by non rpc-based layout drivers
2808 void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2810 if (likely(!hdr->pnfs_error))
2811 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2812 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2813 if (unlikely(hdr->pnfs_error))
2814 pnfs_ld_handle_read_error(hdr);
2815 hdr->mds_ops->rpc_release(hdr);
2817 EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
2820 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2821 struct nfs_pgio_header *hdr)
2823 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2825 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2826 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2827 nfs_pageio_reset_read_mds(desc);
2828 mirror->pg_recoalesce = 1;
2830 hdr->completion_ops->completion(hdr);
2834 * Call the appropriate parallel I/O subsystem read function.
2836 static enum pnfs_try_status
2837 pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2838 const struct rpc_call_ops *call_ops,
2839 struct pnfs_layout_segment *lseg)
2841 struct inode *inode = hdr->inode;
2842 struct nfs_server *nfss = NFS_SERVER(inode);
2843 enum pnfs_try_status trypnfs;
2845 hdr->mds_ops = call_ops;
2847 dprintk("%s: Reading ino:%lu %u@%llu\n",
2848 __func__, inode->i_ino, hdr->args.count, hdr->args.offset);
2850 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
2851 if (trypnfs != PNFS_NOT_ATTEMPTED)
2852 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
2853 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2857 /* Resend all requests through pnfs. */
2858 void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
2860 struct nfs_pageio_descriptor pgio;
2862 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2863 /* Prevent deadlocks with layoutreturn! */
2864 pnfs_put_lseg(hdr->lseg);
2867 nfs_pageio_init_read(&pgio, hdr->inode, false,
2868 hdr->completion_ops);
2869 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
2872 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
2875 pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
2877 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2878 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2879 enum pnfs_try_status trypnfs;
2881 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
2883 case PNFS_NOT_ATTEMPTED:
2884 pnfs_read_through_mds(desc, hdr);
2885 case PNFS_ATTEMPTED:
2887 case PNFS_TRY_AGAIN:
2888 /* cleanup hdr and prepare to redo pnfs */
2889 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2890 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2891 list_splice_init(&hdr->pages, &mirror->pg_list);
2892 mirror->pg_recoalesce = 1;
2894 hdr->mds_ops->rpc_release(hdr);
2898 static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
2900 pnfs_put_lseg(hdr->lseg);
2901 nfs_pgio_header_free(hdr);
2905 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
2907 struct nfs_pgio_header *hdr;
2910 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2912 desc->pg_error = -ENOMEM;
2913 return desc->pg_error;
2915 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
2916 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2917 ret = nfs_generic_pgio(desc, hdr);
2919 pnfs_do_read(desc, hdr);
2922 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
2924 static void pnfs_clear_layoutcommitting(struct inode *inode)
2926 unsigned long *bitlock = &NFS_I(inode)->flags;
2928 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
2929 smp_mb__after_atomic();
2930 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
2934 * There can be multiple RW segments.
2936 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
2938 struct pnfs_layout_segment *lseg;
2940 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
2941 if (lseg->pls_range.iomode == IOMODE_RW &&
2942 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
2943 list_add(&lseg->pls_lc_list, listp);
2947 static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
2949 struct pnfs_layout_segment *lseg, *tmp;
2951 /* Matched by references in pnfs_set_layoutcommit */
2952 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
2953 list_del_init(&lseg->pls_lc_list);
2954 pnfs_put_lseg(lseg);
2957 pnfs_clear_layoutcommitting(inode);
2960 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
2962 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
2964 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
2967 pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
2970 struct nfs_inode *nfsi = NFS_I(inode);
2971 bool mark_as_dirty = false;
2973 spin_lock(&inode->i_lock);
2974 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
2975 nfsi->layout->plh_lwb = end_pos;
2976 mark_as_dirty = true;
2977 dprintk("%s: Set layoutcommit for inode %lu ",
2978 __func__, inode->i_ino);
2979 } else if (end_pos > nfsi->layout->plh_lwb)
2980 nfsi->layout->plh_lwb = end_pos;
2981 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
2982 /* references matched in nfs4_layoutcommit_release */
2983 pnfs_get_lseg(lseg);
2985 spin_unlock(&inode->i_lock);
2986 dprintk("%s: lseg %p end_pos %llu\n",
2987 __func__, lseg, nfsi->layout->plh_lwb);
2989 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2990 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2992 mark_inode_dirty_sync(inode);
2994 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
2996 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
2998 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
3000 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
3001 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
3002 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
3006 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
3007 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
3008 * data to disk to allow the server to recover the data if it crashes.
3009 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
3010 * is off, and a COMMIT is sent to a data server, or
3011 * if WRITEs to a data server return NFS_DATA_SYNC.
3014 pnfs_layoutcommit_inode(struct inode *inode, bool sync)
3016 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
3017 struct nfs4_layoutcommit_data *data;
3018 struct nfs_inode *nfsi = NFS_I(inode);
3022 if (!pnfs_layoutcommit_outstanding(inode))
3025 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
3028 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
3031 status = wait_on_bit_lock_action(&nfsi->flags,
3032 NFS_INO_LAYOUTCOMMITTING,
3033 nfs_wait_bit_killable,
3040 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
3041 data = kzalloc(sizeof(*data), GFP_NOFS);
3043 goto clear_layoutcommitting;
3046 spin_lock(&inode->i_lock);
3047 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
3050 INIT_LIST_HEAD(&data->lseg_list);
3051 pnfs_list_write_lseg(inode, &data->lseg_list);
3053 end_pos = nfsi->layout->plh_lwb;
3055 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
3056 spin_unlock(&inode->i_lock);
3058 data->args.inode = inode;
3059 data->cred = get_cred(nfsi->layout->plh_lc_cred);
3060 nfs_fattr_init(&data->fattr);
3061 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
3062 data->res.fattr = &data->fattr;
3064 data->args.lastbytewritten = end_pos - 1;
3066 data->args.lastbytewritten = U64_MAX;
3067 data->res.server = NFS_SERVER(inode);
3069 if (ld->prepare_layoutcommit) {
3070 status = ld->prepare_layoutcommit(&data->args);
3072 put_cred(data->cred);
3073 spin_lock(&inode->i_lock);
3074 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
3075 if (end_pos > nfsi->layout->plh_lwb)
3076 nfsi->layout->plh_lwb = end_pos;
3082 status = nfs4_proc_layoutcommit(data, sync);
3085 mark_inode_dirty_sync(inode);
3086 dprintk("<-- %s status %d\n", __func__, status);
3089 spin_unlock(&inode->i_lock);
3091 clear_layoutcommitting:
3092 pnfs_clear_layoutcommitting(inode);
3095 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
3098 pnfs_generic_sync(struct inode *inode, bool datasync)
3100 return pnfs_layoutcommit_inode(inode, true);
3102 EXPORT_SYMBOL_GPL(pnfs_generic_sync);
3104 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
3106 struct nfs4_threshold *thp;
3108 thp = kzalloc(sizeof(*thp), GFP_NOFS);
3110 dprintk("%s mdsthreshold allocation failed\n", __func__);
3116 #if IS_ENABLED(CONFIG_NFS_V4_2)
3118 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
3120 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
3121 struct nfs_server *server = NFS_SERVER(inode);
3122 struct nfs_inode *nfsi = NFS_I(inode);
3123 struct nfs42_layoutstat_data *data;
3124 struct pnfs_layout_hdr *hdr;
3127 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
3130 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
3133 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
3136 spin_lock(&inode->i_lock);
3137 if (!NFS_I(inode)->layout) {
3138 spin_unlock(&inode->i_lock);
3139 goto out_clear_layoutstats;
3141 hdr = NFS_I(inode)->layout;
3142 pnfs_get_layout_hdr(hdr);
3143 spin_unlock(&inode->i_lock);
3145 data = kzalloc(sizeof(*data), gfp_flags);
3151 data->args.fh = NFS_FH(inode);
3152 data->args.inode = inode;
3153 status = ld->prepare_layoutstats(&data->args);
3157 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
3160 dprintk("%s returns %d\n", __func__, status);
3166 pnfs_put_layout_hdr(hdr);
3167 out_clear_layoutstats:
3168 smp_mb__before_atomic();
3169 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
3170 smp_mb__after_atomic();
3173 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
3176 unsigned int layoutstats_timer;
3177 module_param(layoutstats_timer, uint, 0644);
3178 EXPORT_SYMBOL_GPL(layoutstats_timer);