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);
96 unset_pnfs_layoutdriver(struct nfs_server *nfss)
98 if (nfss->pnfs_curr_ld) {
99 if (nfss->pnfs_curr_ld->clear_layoutdriver)
100 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
101 /* Decrement the MDS count. Purge the deviceid cache if zero */
102 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
103 nfs4_deviceid_purge_client(nfss->nfs_client);
104 module_put(nfss->pnfs_curr_ld->owner);
106 nfss->pnfs_curr_ld = NULL;
110 * When the server sends a list of layout types, we choose one in the order
111 * given in the list below.
113 * FIXME: should this list be configurable in some fashion? module param?
114 * mount option? something else?
116 static const u32 ld_prefs[] = {
121 LAYOUT_NFSV4_1_FILES,
126 ld_cmp(const void *e1, const void *e2)
128 u32 ld1 = *((u32 *)e1);
129 u32 ld2 = *((u32 *)e2);
132 for (i = 0; ld_prefs[i] != 0; i++) {
133 if (ld1 == ld_prefs[i])
136 if (ld2 == ld_prefs[i])
143 * Try to set the server's pnfs module to the pnfs layout type specified by id.
144 * Currently only one pNFS layout driver per filesystem is supported.
146 * @ids array of layout types supported by MDS.
149 set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
150 struct nfs_fsinfo *fsinfo)
152 struct pnfs_layoutdriver_type *ld_type = NULL;
156 if (fsinfo->nlayouttypes == 0)
158 if (!(server->nfs_client->cl_exchange_flags &
159 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
160 printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n",
161 __func__, server->nfs_client->cl_exchange_flags);
165 sort(fsinfo->layouttype, fsinfo->nlayouttypes,
166 sizeof(*fsinfo->layouttype), ld_cmp, NULL);
168 for (i = 0; i < fsinfo->nlayouttypes; i++) {
169 id = fsinfo->layouttype[i];
170 ld_type = find_pnfs_driver(id);
172 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX,
174 ld_type = find_pnfs_driver(id);
181 dprintk("%s: No pNFS module found!\n", __func__);
185 server->pnfs_curr_ld = ld_type;
186 if (ld_type->set_layoutdriver
187 && ld_type->set_layoutdriver(server, mntfh)) {
188 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
189 "driver %u.\n", __func__, id);
190 module_put(ld_type->owner);
193 /* Bump the MDS count */
194 atomic_inc(&server->nfs_client->cl_mds_count);
196 dprintk("%s: pNFS module for %u set\n", __func__, id);
200 dprintk("%s: Using NFSv4 I/O\n", __func__);
201 server->pnfs_curr_ld = NULL;
205 pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
207 int status = -EINVAL;
208 struct pnfs_layoutdriver_type *tmp;
210 if (ld_type->id == 0) {
211 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
214 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
215 printk(KERN_ERR "NFS: %s Layout driver must provide "
216 "alloc_lseg and free_lseg.\n", __func__);
220 spin_lock(&pnfs_spinlock);
221 tmp = find_pnfs_driver_locked(ld_type->id);
223 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
225 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
228 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
229 __func__, ld_type->id);
231 spin_unlock(&pnfs_spinlock);
235 EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
238 pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
240 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
241 spin_lock(&pnfs_spinlock);
242 list_del(&ld_type->pnfs_tblid);
243 spin_unlock(&pnfs_spinlock);
245 EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
248 * pNFS client layout cache
251 /* Need to hold i_lock if caller does not already hold reference */
253 pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
255 refcount_inc(&lo->plh_refcount);
258 static struct pnfs_layout_hdr *
259 pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
261 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
262 return ld->alloc_layout_hdr(ino, gfp_flags);
266 pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
268 struct nfs_server *server = NFS_SERVER(lo->plh_inode);
269 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
271 if (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) {
272 struct nfs_client *clp = server->nfs_client;
274 spin_lock(&clp->cl_lock);
275 list_del_rcu(&lo->plh_layouts);
276 spin_unlock(&clp->cl_lock);
278 put_cred(lo->plh_lc_cred);
279 return ld->free_layout_hdr(lo);
283 pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
285 struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
286 dprintk("%s: freeing layout cache %p\n", __func__, lo);
288 /* Reset MDS Threshold I/O counters */
294 pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
300 inode = lo->plh_inode;
301 pnfs_layoutreturn_before_put_layout_hdr(lo);
303 if (refcount_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
304 if (!list_empty(&lo->plh_segs))
305 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
306 pnfs_detach_layout_hdr(lo);
307 spin_unlock(&inode->i_lock);
308 pnfs_free_layout_hdr(lo);
312 static struct inode *
313 pnfs_grab_inode_layout_hdr(struct pnfs_layout_hdr *lo)
315 struct inode *inode = igrab(lo->plh_inode);
318 set_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags);
323 pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
326 if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode)
328 lo->plh_return_iomode = iomode;
329 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
331 WARN_ON_ONCE(lo->plh_return_seq != 0 && lo->plh_return_seq != seq);
332 lo->plh_return_seq = seq;
337 pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo)
339 struct pnfs_layout_segment *lseg;
340 lo->plh_return_iomode = 0;
341 lo->plh_return_seq = 0;
342 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
343 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
344 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
346 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
350 static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
352 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
353 clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags);
354 smp_mb__after_atomic();
355 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
356 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
360 pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg,
361 struct list_head *free_me)
363 clear_bit(NFS_LSEG_ROC, &lseg->pls_flags);
364 clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
365 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags))
366 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
367 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
368 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
372 * Update the seqid of a layout stateid after receiving
373 * NFS4ERR_OLD_STATEID
375 bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
376 struct pnfs_layout_range *dst_range,
379 struct pnfs_layout_hdr *lo;
380 struct pnfs_layout_range range = {
381 .iomode = IOMODE_ANY,
383 .length = NFS4_MAX_UINT64,
389 spin_lock(&inode->i_lock);
390 lo = NFS_I(inode)->layout;
391 if (lo && pnfs_layout_is_valid(lo) &&
392 nfs4_stateid_match_other(dst, &lo->plh_stateid)) {
393 /* Is our call using the most recent seqid? If so, bump it */
394 if (!nfs4_stateid_is_newer(&lo->plh_stateid, dst)) {
395 nfs4_stateid_seqid_inc(dst);
399 /* Try to update the seqid to the most recent */
400 err = pnfs_mark_matching_lsegs_return(lo, &head, &range, 0);
402 dst->seqid = lo->plh_stateid.seqid;
408 spin_unlock(&inode->i_lock);
409 pnfs_free_lseg_list(&head);
414 * Mark a pnfs_layout_hdr and all associated layout segments as invalid
416 * In order to continue using the pnfs_layout_hdr, a full recovery
418 * Note that caller must hold inode->i_lock.
421 pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
422 struct list_head *lseg_list)
424 struct pnfs_layout_range range = {
425 .iomode = IOMODE_ANY,
427 .length = NFS4_MAX_UINT64,
429 struct pnfs_layout_segment *lseg, *next;
431 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
432 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
433 pnfs_clear_lseg_state(lseg, lseg_list);
434 pnfs_clear_layoutreturn_info(lo);
435 pnfs_free_returned_lsegs(lo, lseg_list, &range, 0);
436 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) &&
437 !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
438 pnfs_clear_layoutreturn_waitbit(lo);
439 return !list_empty(&lo->plh_segs);
443 pnfs_iomode_to_fail_bit(u32 iomode)
445 return iomode == IOMODE_RW ?
446 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
450 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
452 lo->plh_retry_timestamp = jiffies;
453 if (!test_and_set_bit(fail_bit, &lo->plh_flags))
454 refcount_inc(&lo->plh_refcount);
458 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
460 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
461 refcount_dec(&lo->plh_refcount);
465 pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
467 struct inode *inode = lo->plh_inode;
468 struct pnfs_layout_range range = {
471 .length = NFS4_MAX_UINT64,
475 spin_lock(&inode->i_lock);
476 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
477 pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0);
478 spin_unlock(&inode->i_lock);
479 pnfs_free_lseg_list(&head);
480 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
481 iomode == IOMODE_RW ? "RW" : "READ");
485 pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
487 unsigned long start, end;
488 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
490 if (test_bit(fail_bit, &lo->plh_flags) == 0)
493 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
494 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
495 /* It is time to retry the failed layoutgets */
496 pnfs_layout_clear_fail_bit(lo, fail_bit);
503 pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg,
504 const struct pnfs_layout_range *range,
505 const nfs4_stateid *stateid)
507 INIT_LIST_HEAD(&lseg->pls_list);
508 INIT_LIST_HEAD(&lseg->pls_lc_list);
509 INIT_LIST_HEAD(&lseg->pls_commits);
510 refcount_set(&lseg->pls_refcount, 1);
511 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
512 lseg->pls_layout = lo;
513 lseg->pls_range = *range;
514 lseg->pls_seq = be32_to_cpu(stateid->seqid);
517 static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
520 struct inode *inode = lseg->pls_layout->plh_inode;
521 NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg);
526 pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
527 struct pnfs_layout_segment *lseg)
529 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
530 list_del_init(&lseg->pls_list);
531 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
532 refcount_dec(&lo->plh_refcount);
533 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
535 if (list_empty(&lo->plh_segs) &&
536 !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
537 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
538 if (atomic_read(&lo->plh_outstanding) == 0)
539 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
540 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
545 pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo,
546 struct pnfs_layout_segment *lseg)
548 if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
549 pnfs_layout_is_valid(lo)) {
550 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
551 list_move_tail(&lseg->pls_list, &lo->plh_return_segs);
558 pnfs_put_lseg(struct pnfs_layout_segment *lseg)
560 struct pnfs_layout_hdr *lo;
566 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
567 refcount_read(&lseg->pls_refcount),
568 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
570 lo = lseg->pls_layout;
571 inode = lo->plh_inode;
573 if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
574 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
575 spin_unlock(&inode->i_lock);
578 pnfs_get_layout_hdr(lo);
579 pnfs_layout_remove_lseg(lo, lseg);
580 if (pnfs_cache_lseg_for_layoutreturn(lo, lseg))
582 spin_unlock(&inode->i_lock);
583 pnfs_free_lseg(lseg);
584 pnfs_put_layout_hdr(lo);
587 EXPORT_SYMBOL_GPL(pnfs_put_lseg);
590 * is l2 fully contained in l1?
592 * [----------------------------------)
597 pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
598 const struct pnfs_layout_range *l2)
600 u64 start1 = l1->offset;
601 u64 end1 = pnfs_end_offset(start1, l1->length);
602 u64 start2 = l2->offset;
603 u64 end2 = pnfs_end_offset(start2, l2->length);
605 return (start1 <= start2) && (end1 >= end2);
608 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
609 struct list_head *tmp_list)
611 if (!refcount_dec_and_test(&lseg->pls_refcount))
613 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
614 list_add(&lseg->pls_list, tmp_list);
618 /* Returns 1 if lseg is removed from list, 0 otherwise */
619 static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
620 struct list_head *tmp_list)
624 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
625 /* Remove the reference keeping the lseg in the
626 * list. It will now be removed when all
627 * outstanding io is finished.
629 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
630 refcount_read(&lseg->pls_refcount));
631 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
638 * Compare 2 layout stateid sequence ids, to see which is newer,
639 * taking into account wraparound issues.
641 static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
643 return (s32)(s1 - s2) > 0;
647 pnfs_should_free_range(const struct pnfs_layout_range *lseg_range,
648 const struct pnfs_layout_range *recall_range)
650 return (recall_range->iomode == IOMODE_ANY ||
651 lseg_range->iomode == recall_range->iomode) &&
652 pnfs_lseg_range_intersecting(lseg_range, recall_range);
656 pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg,
657 const struct pnfs_layout_range *recall_range,
660 if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq))
662 if (recall_range == NULL)
664 return pnfs_should_free_range(&lseg->pls_range, recall_range);
668 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later
669 * @lo: layout header containing the lsegs
670 * @tmp_list: list head where doomed lsegs should go
671 * @recall_range: optional recall range argument to match (may be NULL)
672 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0)
674 * Walk the list of lsegs in the layout header, and tear down any that should
675 * be destroyed. If "recall_range" is specified then the segment must match
676 * that range. If "seq" is non-zero, then only match segments that were handed
677 * out at or before that sequence.
679 * Returns number of matching invalid lsegs remaining in list after scanning
680 * it and purging them.
683 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
684 struct list_head *tmp_list,
685 const struct pnfs_layout_range *recall_range,
688 struct pnfs_layout_segment *lseg, *next;
691 dprintk("%s:Begin lo %p\n", __func__, lo);
693 if (list_empty(&lo->plh_segs))
695 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
696 if (pnfs_match_lseg_recall(lseg, recall_range, seq)) {
697 dprintk("%s: freeing lseg %p iomode %d seq %u "
698 "offset %llu length %llu\n", __func__,
699 lseg, lseg->pls_range.iomode, lseg->pls_seq,
700 lseg->pls_range.offset, lseg->pls_range.length);
701 if (!mark_lseg_invalid(lseg, tmp_list))
704 dprintk("%s:Return %i\n", __func__, remaining);
709 pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
710 struct list_head *free_me,
711 const struct pnfs_layout_range *range,
714 struct pnfs_layout_segment *lseg, *next;
716 list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) {
717 if (pnfs_match_lseg_recall(lseg, range, seq))
718 list_move_tail(&lseg->pls_list, free_me);
722 /* note free_me must contain lsegs from a single layout_hdr */
724 pnfs_free_lseg_list(struct list_head *free_me)
726 struct pnfs_layout_segment *lseg, *tmp;
728 if (list_empty(free_me))
731 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
732 list_del(&lseg->pls_list);
733 pnfs_free_lseg(lseg);
738 pnfs_destroy_layout(struct nfs_inode *nfsi)
740 struct pnfs_layout_hdr *lo;
743 spin_lock(&nfsi->vfs_inode.i_lock);
746 pnfs_get_layout_hdr(lo);
747 pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
748 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
749 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
750 spin_unlock(&nfsi->vfs_inode.i_lock);
751 pnfs_free_lseg_list(&tmp_list);
752 nfs_commit_inode(&nfsi->vfs_inode, 0);
753 pnfs_put_layout_hdr(lo);
755 spin_unlock(&nfsi->vfs_inode.i_lock);
757 EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
760 pnfs_layout_add_bulk_destroy_list(struct inode *inode,
761 struct list_head *layout_list)
763 struct pnfs_layout_hdr *lo;
766 spin_lock(&inode->i_lock);
767 lo = NFS_I(inode)->layout;
768 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
769 pnfs_get_layout_hdr(lo);
770 list_add(&lo->plh_bulk_destroy, layout_list);
773 spin_unlock(&inode->i_lock);
777 /* Caller must hold rcu_read_lock and clp->cl_lock */
779 pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
780 struct nfs_server *server,
781 struct list_head *layout_list)
782 __must_hold(&clp->cl_lock)
785 struct pnfs_layout_hdr *lo, *next;
788 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
789 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
790 test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) ||
791 !list_empty(&lo->plh_bulk_destroy))
793 /* If the sb is being destroyed, just bail */
794 if (!nfs_sb_active(server->super))
796 inode = pnfs_grab_inode_layout_hdr(lo);
798 if (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags))
799 list_del_rcu(&lo->plh_layouts);
800 if (pnfs_layout_add_bulk_destroy_list(inode,
804 spin_unlock(&clp->cl_lock);
808 spin_unlock(&clp->cl_lock);
810 nfs_sb_deactive(server->super);
811 spin_lock(&clp->cl_lock);
819 pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
822 struct pnfs_layout_hdr *lo;
824 LIST_HEAD(lseg_list);
827 while (!list_empty(layout_list)) {
828 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
830 dprintk("%s freeing layout for inode %lu\n", __func__,
831 lo->plh_inode->i_ino);
832 inode = lo->plh_inode;
834 pnfs_layoutcommit_inode(inode, false);
836 spin_lock(&inode->i_lock);
837 list_del_init(&lo->plh_bulk_destroy);
838 if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
840 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
843 spin_unlock(&inode->i_lock);
844 pnfs_free_lseg_list(&lseg_list);
845 /* Free all lsegs that are attached to commit buckets */
846 nfs_commit_inode(inode, 0);
847 pnfs_put_layout_hdr(lo);
848 nfs_iput_and_deactive(inode);
854 pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
855 struct nfs_fsid *fsid,
858 struct nfs_server *server;
859 LIST_HEAD(layout_list);
861 spin_lock(&clp->cl_lock);
864 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
865 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
867 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
873 spin_unlock(&clp->cl_lock);
875 if (list_empty(&layout_list))
877 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
881 pnfs_destroy_layouts_byclid(struct nfs_client *clp,
884 struct nfs_server *server;
885 LIST_HEAD(layout_list);
887 spin_lock(&clp->cl_lock);
890 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
891 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
897 spin_unlock(&clp->cl_lock);
899 if (list_empty(&layout_list))
901 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
905 * Called by the state manger to remove all layouts established under an
909 pnfs_destroy_all_layouts(struct nfs_client *clp)
911 nfs4_deviceid_mark_client_invalid(clp);
912 nfs4_deviceid_purge_client(clp);
914 pnfs_destroy_layouts_byclid(clp, false);
918 pnfs_set_layout_cred(struct pnfs_layout_hdr *lo, const struct cred *cred)
920 const struct cred *old;
922 if (cred && cred_fscmp(lo->plh_lc_cred, cred) != 0) {
923 old = xchg(&lo->plh_lc_cred, get_cred(cred));
928 /* update lo->plh_stateid with new if is more recent */
930 pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
931 const struct cred *cred, bool update_barrier)
933 u32 oldseq, newseq, new_barrier = 0;
935 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
936 newseq = be32_to_cpu(new->seqid);
938 if (!pnfs_layout_is_valid(lo)) {
939 pnfs_set_layout_cred(lo, cred);
940 nfs4_stateid_copy(&lo->plh_stateid, new);
941 lo->plh_barrier = newseq;
942 pnfs_clear_layoutreturn_info(lo);
943 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
946 if (pnfs_seqid_is_newer(newseq, oldseq)) {
947 nfs4_stateid_copy(&lo->plh_stateid, new);
949 * Because of wraparound, we want to keep the barrier
950 * "close" to the current seqids.
952 new_barrier = newseq - atomic_read(&lo->plh_outstanding);
955 new_barrier = be32_to_cpu(new->seqid);
956 else if (new_barrier == 0)
958 if (pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
959 lo->plh_barrier = new_barrier;
963 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
964 const nfs4_stateid *stateid)
966 u32 seqid = be32_to_cpu(stateid->seqid);
968 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
971 /* lget is set to 1 if called from inside send_layoutget call chain */
973 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
975 return lo->plh_block_lgets ||
976 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
979 static struct nfs_server *
980 pnfs_find_server(struct inode *inode, struct nfs_open_context *ctx)
982 struct nfs_server *server;
985 server = NFS_SERVER(inode);
987 struct dentry *parent_dir = dget_parent(ctx->dentry);
988 server = NFS_SERVER(parent_dir->d_inode);
994 static void nfs4_free_pages(struct page **pages, size_t size)
1001 for (i = 0; i < size; i++) {
1004 __free_page(pages[i]);
1009 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
1011 struct page **pages;
1014 pages = kmalloc_array(size, sizeof(struct page *), gfp_flags);
1016 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
1020 for (i = 0; i < size; i++) {
1021 pages[i] = alloc_page(gfp_flags);
1023 dprintk("%s: failed to allocate page\n", __func__);
1024 nfs4_free_pages(pages, i);
1032 static struct nfs4_layoutget *
1033 pnfs_alloc_init_layoutget_args(struct inode *ino,
1034 struct nfs_open_context *ctx,
1035 const nfs4_stateid *stateid,
1036 const struct pnfs_layout_range *range,
1039 struct nfs_server *server = pnfs_find_server(ino, ctx);
1040 size_t max_reply_sz = server->pnfs_curr_ld->max_layoutget_response;
1041 size_t max_pages = max_response_pages(server);
1042 struct nfs4_layoutget *lgp;
1044 dprintk("--> %s\n", __func__);
1046 lgp = kzalloc(sizeof(*lgp), gfp_flags);
1051 size_t npages = (max_reply_sz + PAGE_SIZE - 1) >> PAGE_SHIFT;
1052 if (npages < max_pages)
1056 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
1057 if (!lgp->args.layout.pages) {
1061 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
1062 lgp->res.layoutp = &lgp->args.layout;
1064 /* Don't confuse uninitialised result and success */
1065 lgp->res.status = -NFS4ERR_DELAY;
1067 lgp->args.minlength = PAGE_SIZE;
1068 if (lgp->args.minlength > range->length)
1069 lgp->args.minlength = range->length;
1071 loff_t i_size = i_size_read(ino);
1073 if (range->iomode == IOMODE_READ) {
1074 if (range->offset >= i_size)
1075 lgp->args.minlength = 0;
1076 else if (i_size - range->offset < lgp->args.minlength)
1077 lgp->args.minlength = i_size - range->offset;
1080 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
1081 pnfs_copy_range(&lgp->args.range, range);
1082 lgp->args.type = server->pnfs_curr_ld->id;
1083 lgp->args.inode = ino;
1084 lgp->args.ctx = get_nfs_open_context(ctx);
1085 nfs4_stateid_copy(&lgp->args.stateid, stateid);
1086 lgp->gfp_flags = gfp_flags;
1087 lgp->cred = ctx->cred;
1091 void pnfs_layoutget_free(struct nfs4_layoutget *lgp)
1093 size_t max_pages = lgp->args.layout.pglen / PAGE_SIZE;
1095 nfs4_free_pages(lgp->args.layout.pages, max_pages);
1096 if (lgp->args.inode)
1097 pnfs_put_layout_hdr(NFS_I(lgp->args.inode)->layout);
1098 put_nfs_open_context(lgp->args.ctx);
1102 static void pnfs_clear_layoutcommit(struct inode *inode,
1103 struct list_head *head)
1105 struct nfs_inode *nfsi = NFS_I(inode);
1106 struct pnfs_layout_segment *lseg, *tmp;
1108 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1110 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
1111 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
1113 pnfs_lseg_dec_and_remove_zero(lseg, head);
1117 void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
1118 const nfs4_stateid *arg_stateid,
1119 const struct pnfs_layout_range *range,
1120 const nfs4_stateid *stateid)
1122 struct inode *inode = lo->plh_inode;
1125 spin_lock(&inode->i_lock);
1126 if (!pnfs_layout_is_valid(lo) || !arg_stateid ||
1127 !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid))
1130 u32 seq = be32_to_cpu(arg_stateid->seqid);
1132 pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq);
1133 pnfs_free_returned_lsegs(lo, &freeme, range, seq);
1134 pnfs_set_layout_stateid(lo, stateid, NULL, true);
1136 pnfs_mark_layout_stateid_invalid(lo, &freeme);
1138 pnfs_clear_layoutreturn_waitbit(lo);
1139 spin_unlock(&inode->i_lock);
1140 pnfs_free_lseg_list(&freeme);
1145 pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo,
1146 nfs4_stateid *stateid,
1147 const struct cred **cred,
1148 enum pnfs_iomode *iomode)
1150 /* Serialise LAYOUTGET/LAYOUTRETURN */
1151 if (atomic_read(&lo->plh_outstanding) != 0)
1153 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
1155 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
1156 pnfs_get_layout_hdr(lo);
1157 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
1158 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1159 *cred = get_cred(lo->plh_lc_cred);
1160 if (lo->plh_return_seq != 0)
1161 stateid->seqid = cpu_to_be32(lo->plh_return_seq);
1163 *iomode = lo->plh_return_iomode;
1164 pnfs_clear_layoutreturn_info(lo);
1167 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1168 *cred = get_cred(lo->plh_lc_cred);
1170 *iomode = IOMODE_ANY;
1175 pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args,
1176 struct pnfs_layout_hdr *lo,
1177 const nfs4_stateid *stateid,
1178 enum pnfs_iomode iomode)
1180 struct inode *inode = lo->plh_inode;
1182 args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id;
1183 args->inode = inode;
1184 args->range.iomode = iomode;
1185 args->range.offset = 0;
1186 args->range.length = NFS4_MAX_UINT64;
1188 nfs4_stateid_copy(&args->stateid, stateid);
1192 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo,
1193 const nfs4_stateid *stateid,
1194 const struct cred **pcred,
1195 enum pnfs_iomode iomode,
1198 struct inode *ino = lo->plh_inode;
1199 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1200 struct nfs4_layoutreturn *lrp;
1201 const struct cred *cred = *pcred;
1205 lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
1206 if (unlikely(lrp == NULL)) {
1208 spin_lock(&ino->i_lock);
1209 pnfs_clear_layoutreturn_waitbit(lo);
1210 spin_unlock(&ino->i_lock);
1212 pnfs_put_layout_hdr(lo);
1216 pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode);
1217 lrp->args.ld_private = &lrp->ld_private;
1218 lrp->clp = NFS_SERVER(ino)->nfs_client;
1220 if (ld->prepare_layoutreturn)
1221 ld->prepare_layoutreturn(&lrp->args);
1223 status = nfs4_proc_layoutreturn(lrp, sync);
1225 dprintk("<-- %s status: %d\n", __func__, status);
1230 pnfs_layout_segments_returnable(struct pnfs_layout_hdr *lo,
1231 enum pnfs_iomode iomode,
1234 struct pnfs_layout_range recall_range = {
1235 .length = NFS4_MAX_UINT64,
1238 return pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs,
1239 &recall_range, seq) != -EBUSY;
1242 /* Return true if layoutreturn is needed */
1244 pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
1246 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1248 return pnfs_layout_segments_returnable(lo, lo->plh_return_iomode,
1249 lo->plh_return_seq);
1252 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo)
1254 struct inode *inode= lo->plh_inode;
1256 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1258 spin_lock(&inode->i_lock);
1259 if (pnfs_layout_need_return(lo)) {
1260 const struct cred *cred;
1261 nfs4_stateid stateid;
1262 enum pnfs_iomode iomode;
1265 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode);
1266 spin_unlock(&inode->i_lock);
1268 /* Send an async layoutreturn so we dont deadlock */
1269 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false);
1272 spin_unlock(&inode->i_lock);
1276 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
1277 * when the layout segment list is empty.
1279 * Note that a pnfs_layout_hdr can exist with an empty layout segment
1280 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
1281 * deviceid is marked invalid.
1284 _pnfs_return_layout(struct inode *ino)
1286 struct pnfs_layout_hdr *lo = NULL;
1287 struct nfs_inode *nfsi = NFS_I(ino);
1288 LIST_HEAD(tmp_list);
1289 const struct cred *cred;
1290 nfs4_stateid stateid;
1292 bool send, valid_layout;
1294 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
1296 spin_lock(&ino->i_lock);
1299 spin_unlock(&ino->i_lock);
1300 dprintk("NFS: %s no layout to return\n", __func__);
1303 /* Reference matched in nfs4_layoutreturn_release */
1304 pnfs_get_layout_hdr(lo);
1305 /* Is there an outstanding layoutreturn ? */
1306 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1307 spin_unlock(&ino->i_lock);
1308 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1309 TASK_UNINTERRUPTIBLE))
1310 goto out_put_layout_hdr;
1311 spin_lock(&ino->i_lock);
1313 valid_layout = pnfs_layout_is_valid(lo);
1314 pnfs_clear_layoutcommit(ino, &tmp_list);
1315 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL, 0);
1317 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
1318 struct pnfs_layout_range range = {
1319 .iomode = IOMODE_ANY,
1321 .length = NFS4_MAX_UINT64,
1323 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
1326 /* Don't send a LAYOUTRETURN if list was initially empty */
1327 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) ||
1329 spin_unlock(&ino->i_lock);
1330 dprintk("NFS: %s no layout segments to return\n", __func__);
1331 goto out_wait_layoutreturn;
1334 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, NULL);
1335 spin_unlock(&ino->i_lock);
1337 status = pnfs_send_layoutreturn(lo, &stateid, &cred, IOMODE_ANY, true);
1338 out_wait_layoutreturn:
1339 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, TASK_UNINTERRUPTIBLE);
1341 pnfs_free_lseg_list(&tmp_list);
1342 pnfs_put_layout_hdr(lo);
1344 dprintk("<-- %s status: %d\n", __func__, status);
1349 pnfs_commit_and_return_layout(struct inode *inode)
1351 struct pnfs_layout_hdr *lo;
1354 spin_lock(&inode->i_lock);
1355 lo = NFS_I(inode)->layout;
1357 spin_unlock(&inode->i_lock);
1360 pnfs_get_layout_hdr(lo);
1361 /* Block new layoutgets and read/write to ds */
1362 lo->plh_block_lgets++;
1363 spin_unlock(&inode->i_lock);
1364 filemap_fdatawait(inode->i_mapping);
1365 ret = pnfs_layoutcommit_inode(inode, true);
1367 ret = _pnfs_return_layout(inode);
1368 spin_lock(&inode->i_lock);
1369 lo->plh_block_lgets--;
1370 spin_unlock(&inode->i_lock);
1371 pnfs_put_layout_hdr(lo);
1375 bool pnfs_roc(struct inode *ino,
1376 struct nfs4_layoutreturn_args *args,
1377 struct nfs4_layoutreturn_res *res,
1378 const struct cred *cred)
1380 struct nfs_inode *nfsi = NFS_I(ino);
1381 struct nfs_open_context *ctx;
1382 struct nfs4_state *state;
1383 struct pnfs_layout_hdr *lo;
1384 struct pnfs_layout_segment *lseg, *next;
1385 const struct cred *lc_cred;
1386 nfs4_stateid stateid;
1387 enum pnfs_iomode iomode = 0;
1388 bool layoutreturn = false, roc = false;
1389 bool skip_read = false;
1391 if (!nfs_have_layout(ino))
1395 spin_lock(&ino->i_lock);
1397 if (!lo || !pnfs_layout_is_valid(lo) ||
1398 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1402 pnfs_get_layout_hdr(lo);
1403 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1404 spin_unlock(&ino->i_lock);
1406 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1407 TASK_UNINTERRUPTIBLE);
1408 pnfs_put_layout_hdr(lo);
1412 /* no roc if we hold a delegation */
1413 if (nfs4_check_delegation(ino, FMODE_READ)) {
1414 if (nfs4_check_delegation(ino, FMODE_WRITE))
1419 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1423 /* Don't return layout if there is open file state */
1424 if (state->state & FMODE_WRITE)
1426 if (state->state & FMODE_READ)
1431 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) {
1432 if (skip_read && lseg->pls_range.iomode == IOMODE_READ)
1434 /* If we are sending layoutreturn, invalidate all valid lsegs */
1435 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags))
1438 * Note: mark lseg for return so pnfs_layout_remove_lseg
1439 * doesn't invalidate the layout for us.
1441 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1442 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs))
1444 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
1447 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1450 /* ROC in two conditions:
1451 * 1. there are ROC lsegs
1452 * 2. we don't send layoutreturn
1454 /* lo ref dropped in pnfs_roc_release() */
1455 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &lc_cred, &iomode);
1456 /* If the creds don't match, we can't compound the layoutreturn */
1457 if (!layoutreturn || cred_fscmp(cred, lc_cred) != 0)
1461 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode);
1462 res->lrs_present = 0;
1463 layoutreturn = false;
1467 spin_unlock(&ino->i_lock);
1469 pnfs_layoutcommit_inode(ino, true);
1471 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1472 if (ld->prepare_layoutreturn)
1473 ld->prepare_layoutreturn(args);
1474 pnfs_put_layout_hdr(lo);
1478 pnfs_send_layoutreturn(lo, &stateid, &lc_cred, iomode, true);
1479 pnfs_put_layout_hdr(lo);
1483 int pnfs_roc_done(struct rpc_task *task, struct inode *inode,
1484 struct nfs4_layoutreturn_args **argpp,
1485 struct nfs4_layoutreturn_res **respp,
1488 struct nfs4_layoutreturn_args *arg = *argpp;
1489 int retval = -EAGAIN;
1493 /* Handle Layoutreturn errors */
1498 case -NFS4ERR_NOMATCHING_LAYOUT:
1499 /* Was there an RPC level error? If not, retry */
1500 if (task->tk_rpc_status == 0)
1502 /* If the call was not sent, let caller handle it */
1503 if (!RPC_WAS_SENT(task))
1506 * Otherwise, assume the call succeeded and
1507 * that we need to release the layout
1510 (*respp)->lrs_present = 0;
1513 case -NFS4ERR_DELAY:
1514 /* Let the caller handle the retry */
1515 *ret = -NFS4ERR_NOMATCHING_LAYOUT;
1517 case -NFS4ERR_OLD_STATEID:
1518 if (!nfs4_layout_refresh_old_stateid(&arg->stateid,
1519 &arg->range, inode))
1521 *ret = -NFS4ERR_NOMATCHING_LAYOUT;
1529 void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
1530 struct nfs4_layoutreturn_res *res,
1533 struct pnfs_layout_hdr *lo = args->layout;
1534 const nfs4_stateid *arg_stateid = NULL;
1535 const nfs4_stateid *res_stateid = NULL;
1536 struct nfs4_xdr_opaque_data *ld_private = args->ld_private;
1539 case -NFS4ERR_NOMATCHING_LAYOUT:
1542 if (res->lrs_present)
1543 res_stateid = &res->stateid;
1546 arg_stateid = &args->stateid;
1548 trace_nfs4_layoutreturn_on_close(args->inode, &args->stateid, ret);
1549 pnfs_layoutreturn_free_lsegs(lo, arg_stateid, &args->range,
1551 if (ld_private && ld_private->ops && ld_private->ops->free)
1552 ld_private->ops->free(ld_private);
1553 pnfs_put_layout_hdr(lo);
1556 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1558 struct nfs_inode *nfsi = NFS_I(ino);
1559 struct pnfs_layout_hdr *lo;
1562 /* we might not have grabbed lo reference. so need to check under
1564 spin_lock(&ino->i_lock);
1566 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1567 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
1570 spin_unlock(&ino->i_lock);
1575 * Compare two layout segments for sorting into layout cache.
1576 * We want to preferentially return RW over RO layouts, so ensure those
1580 pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1581 const struct pnfs_layout_range *l2)
1585 /* high offset > low offset */
1586 d = l1->offset - l2->offset;
1590 /* short length > long length */
1591 d = l2->length - l1->length;
1595 /* read > read/write */
1596 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1600 pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1601 const struct pnfs_layout_range *l2)
1603 return pnfs_lseg_range_cmp(l1, l2) > 0;
1607 pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1608 struct pnfs_layout_segment *old)
1614 pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1615 struct pnfs_layout_segment *lseg,
1616 bool (*is_after)(const struct pnfs_layout_range *,
1617 const struct pnfs_layout_range *),
1618 bool (*do_merge)(struct pnfs_layout_segment *,
1619 struct pnfs_layout_segment *),
1620 struct list_head *free_me)
1622 struct pnfs_layout_segment *lp, *tmp;
1624 dprintk("%s:Begin\n", __func__);
1626 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1627 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1629 if (do_merge(lseg, lp)) {
1630 mark_lseg_invalid(lp, free_me);
1633 if (is_after(&lseg->pls_range, &lp->pls_range))
1635 list_add_tail(&lseg->pls_list, &lp->pls_list);
1636 dprintk("%s: inserted lseg %p "
1637 "iomode %d offset %llu length %llu before "
1638 "lp %p iomode %d offset %llu length %llu\n",
1639 __func__, lseg, lseg->pls_range.iomode,
1640 lseg->pls_range.offset, lseg->pls_range.length,
1641 lp, lp->pls_range.iomode, lp->pls_range.offset,
1642 lp->pls_range.length);
1645 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1646 dprintk("%s: inserted lseg %p "
1647 "iomode %d offset %llu length %llu at tail\n",
1648 __func__, lseg, lseg->pls_range.iomode,
1649 lseg->pls_range.offset, lseg->pls_range.length);
1651 pnfs_get_layout_hdr(lo);
1653 dprintk("%s:Return\n", __func__);
1655 EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1658 pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1659 struct pnfs_layout_segment *lseg,
1660 struct list_head *free_me)
1662 struct inode *inode = lo->plh_inode;
1663 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1665 if (ld->add_lseg != NULL)
1666 ld->add_lseg(lo, lseg, free_me);
1668 pnfs_generic_layout_insert_lseg(lo, lseg,
1669 pnfs_lseg_range_is_after,
1674 static struct pnfs_layout_hdr *
1675 alloc_init_layout_hdr(struct inode *ino,
1676 struct nfs_open_context *ctx,
1679 struct pnfs_layout_hdr *lo;
1681 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1684 refcount_set(&lo->plh_refcount, 1);
1685 INIT_LIST_HEAD(&lo->plh_layouts);
1686 INIT_LIST_HEAD(&lo->plh_segs);
1687 INIT_LIST_HEAD(&lo->plh_return_segs);
1688 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1689 lo->plh_inode = ino;
1690 lo->plh_lc_cred = get_cred(ctx->cred);
1691 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID;
1695 static struct pnfs_layout_hdr *
1696 pnfs_find_alloc_layout(struct inode *ino,
1697 struct nfs_open_context *ctx,
1699 __releases(&ino->i_lock)
1700 __acquires(&ino->i_lock)
1702 struct nfs_inode *nfsi = NFS_I(ino);
1703 struct pnfs_layout_hdr *new = NULL;
1705 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1707 if (nfsi->layout != NULL)
1709 spin_unlock(&ino->i_lock);
1710 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1711 spin_lock(&ino->i_lock);
1713 if (likely(nfsi->layout == NULL)) { /* Won the race? */
1716 } else if (new != NULL)
1717 pnfs_free_layout_hdr(new);
1719 pnfs_get_layout_hdr(nfsi->layout);
1720 return nfsi->layout;
1724 * iomode matching rules:
1725 * iomode lseg strict match
1727 * ----- ----- ------ -----
1732 * READ READ N/A true
1733 * READ RW true false
1734 * READ RW false true
1737 pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1738 const struct pnfs_layout_range *range,
1741 struct pnfs_layout_range range1;
1743 if ((range->iomode == IOMODE_RW &&
1744 ls_range->iomode != IOMODE_RW) ||
1745 (range->iomode != ls_range->iomode &&
1747 !pnfs_lseg_range_intersecting(ls_range, range))
1750 /* range1 covers only the first byte in the range */
1753 return pnfs_lseg_range_contained(ls_range, &range1);
1757 * lookup range in layout
1759 static struct pnfs_layout_segment *
1760 pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1761 struct pnfs_layout_range *range,
1764 struct pnfs_layout_segment *lseg, *ret = NULL;
1766 dprintk("%s:Begin\n", __func__);
1768 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1769 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1770 pnfs_lseg_range_match(&lseg->pls_range, range,
1772 ret = pnfs_get_lseg(lseg);
1777 dprintk("%s:Return lseg %p ref %d\n",
1778 __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0);
1783 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1784 * to the MDS or over pNFS
1786 * The nfs_inode read_io and write_io fields are cumulative counters reset
1787 * when there are no layout segments. Note that in pnfs_update_layout iomode
1788 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1791 * A return of true means use MDS I/O.
1794 * If a file's size is smaller than the file size threshold, data accesses
1795 * SHOULD be sent to the metadata server. If an I/O request has a length that
1796 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1797 * server. If both file size and I/O size are provided, the client SHOULD
1798 * reach or exceed both thresholds before sending its read or write
1799 * requests to the data server.
1801 static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1802 struct inode *ino, int iomode)
1804 struct nfs4_threshold *t = ctx->mdsthreshold;
1805 struct nfs_inode *nfsi = NFS_I(ino);
1806 loff_t fsize = i_size_read(ino);
1807 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1812 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1813 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1817 if (t->bm & THRESHOLD_RD) {
1818 dprintk("%s fsize %llu\n", __func__, fsize);
1820 if (fsize < t->rd_sz)
1823 if (t->bm & THRESHOLD_RD_IO) {
1824 dprintk("%s nfsi->read_io %llu\n", __func__,
1827 if (nfsi->read_io < t->rd_io_sz)
1832 if (t->bm & THRESHOLD_WR) {
1833 dprintk("%s fsize %llu\n", __func__, fsize);
1835 if (fsize < t->wr_sz)
1838 if (t->bm & THRESHOLD_WR_IO) {
1839 dprintk("%s nfsi->write_io %llu\n", __func__,
1842 if (nfsi->write_io < t->wr_io_sz)
1847 if (size_set && io_set) {
1850 } else if (size || io)
1853 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1857 static int pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
1860 * send layoutcommit as it can hold up layoutreturn due to lseg
1863 pnfs_layoutcommit_inode(lo->plh_inode, false);
1864 return wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
1865 nfs_wait_bit_killable,
1869 static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo)
1871 atomic_inc(&lo->plh_outstanding);
1874 static void nfs_layoutget_end(struct pnfs_layout_hdr *lo)
1876 if (atomic_dec_and_test(&lo->plh_outstanding))
1877 wake_up_var(&lo->plh_outstanding);
1880 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1882 unsigned long *bitlock = &lo->plh_flags;
1884 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1885 smp_mb__after_atomic();
1886 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1889 static void _add_to_server_list(struct pnfs_layout_hdr *lo,
1890 struct nfs_server *server)
1892 if (!test_and_set_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) {
1893 struct nfs_client *clp = server->nfs_client;
1895 /* The lo must be on the clp list if there is any
1896 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1898 spin_lock(&clp->cl_lock);
1899 list_add_tail_rcu(&lo->plh_layouts, &server->layouts);
1900 spin_unlock(&clp->cl_lock);
1905 * Layout segment is retreived from the server if not cached.
1906 * The appropriate layout segment is referenced and returned to the caller.
1908 struct pnfs_layout_segment *
1909 pnfs_update_layout(struct inode *ino,
1910 struct nfs_open_context *ctx,
1913 enum pnfs_iomode iomode,
1917 struct pnfs_layout_range arg = {
1923 struct nfs_server *server = NFS_SERVER(ino);
1924 struct nfs_client *clp = server->nfs_client;
1925 struct pnfs_layout_hdr *lo = NULL;
1926 struct pnfs_layout_segment *lseg = NULL;
1927 struct nfs4_layoutget *lgp;
1928 nfs4_stateid stateid;
1930 unsigned long giveup = jiffies + (clp->cl_lease_time << 1);
1933 if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
1934 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1935 PNFS_UPDATE_LAYOUT_NO_PNFS);
1939 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
1940 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1941 PNFS_UPDATE_LAYOUT_MDSTHRESH);
1946 lseg = ERR_PTR(nfs4_client_recover_expired_lease(clp));
1950 spin_lock(&ino->i_lock);
1951 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1953 spin_unlock(&ino->i_lock);
1954 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1955 PNFS_UPDATE_LAYOUT_NOMEM);
1959 /* Do we even need to bother with this? */
1960 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1961 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1962 PNFS_UPDATE_LAYOUT_BULK_RECALL);
1963 dprintk("%s matches recall, use MDS\n", __func__);
1967 /* if LAYOUTGET already failed once we don't try again */
1968 if (pnfs_layout_io_test_failed(lo, iomode)) {
1969 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1970 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
1975 * If the layout segment list is empty, but there are outstanding
1976 * layoutget calls, then they might be subject to a layoutrecall.
1978 if (list_empty(&lo->plh_segs) &&
1979 atomic_read(&lo->plh_outstanding) != 0) {
1980 spin_unlock(&ino->i_lock);
1981 lseg = ERR_PTR(wait_var_event_killable(&lo->plh_outstanding,
1982 !atomic_read(&lo->plh_outstanding)));
1984 goto out_put_layout_hdr;
1985 pnfs_put_layout_hdr(lo);
1989 lseg = pnfs_find_lseg(lo, &arg, strict_iomode);
1991 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1992 PNFS_UPDATE_LAYOUT_FOUND_CACHED);
1997 * Choose a stateid for the LAYOUTGET. If we don't have a layout
1998 * stateid, or it has been invalidated, then we must use the open
2001 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
2005 * The first layoutget for the file. Need to serialize per
2006 * RFC 5661 Errata 3208.
2008 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
2010 spin_unlock(&ino->i_lock);
2011 lseg = ERR_PTR(wait_on_bit(&lo->plh_flags,
2012 NFS_LAYOUT_FIRST_LAYOUTGET,
2015 goto out_put_layout_hdr;
2016 pnfs_put_layout_hdr(lo);
2017 dprintk("%s retrying\n", __func__);
2021 spin_unlock(&ino->i_lock);
2023 status = nfs4_select_rw_stateid(ctx->state,
2024 iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ,
2025 NULL, &stateid, NULL);
2027 lseg = ERR_PTR(status);
2028 trace_pnfs_update_layout(ino, pos, count,
2030 PNFS_UPDATE_LAYOUT_INVALID_OPEN);
2031 nfs4_schedule_stateid_recovery(server, ctx->state);
2032 pnfs_clear_first_layoutget(lo);
2033 pnfs_put_layout_hdr(lo);
2036 spin_lock(&ino->i_lock);
2038 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
2042 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
2043 * for LAYOUTRETURN even if first is true.
2045 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
2046 spin_unlock(&ino->i_lock);
2047 dprintk("%s wait for layoutreturn\n", __func__);
2048 lseg = ERR_PTR(pnfs_prepare_to_retry_layoutget(lo));
2049 if (!IS_ERR(lseg)) {
2051 pnfs_clear_first_layoutget(lo);
2052 pnfs_put_layout_hdr(lo);
2053 dprintk("%s retrying\n", __func__);
2054 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
2055 lseg, PNFS_UPDATE_LAYOUT_RETRY);
2058 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2059 PNFS_UPDATE_LAYOUT_RETURN);
2060 goto out_put_layout_hdr;
2063 if (pnfs_layoutgets_blocked(lo)) {
2064 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2065 PNFS_UPDATE_LAYOUT_BLOCKED);
2068 nfs_layoutget_begin(lo);
2069 spin_unlock(&ino->i_lock);
2071 _add_to_server_list(lo, server);
2073 pg_offset = arg.offset & ~PAGE_MASK;
2075 arg.offset -= pg_offset;
2076 arg.length += pg_offset;
2078 if (arg.length != NFS4_MAX_UINT64)
2079 arg.length = PAGE_ALIGN(arg.length);
2081 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &stateid, &arg, gfp_flags);
2083 trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL,
2084 PNFS_UPDATE_LAYOUT_NOMEM);
2085 nfs_layoutget_end(lo);
2086 goto out_put_layout_hdr;
2089 lseg = nfs4_proc_layoutget(lgp, &timeout);
2090 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2091 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
2092 nfs_layoutget_end(lo);
2094 switch(PTR_ERR(lseg)) {
2096 if (time_after(jiffies, giveup))
2099 case -ERECALLCONFLICT:
2103 if (!nfs_error_is_fatal(PTR_ERR(lseg))) {
2104 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2107 goto out_put_layout_hdr;
2111 pnfs_clear_first_layoutget(lo);
2112 trace_pnfs_update_layout(ino, pos, count,
2113 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY);
2114 pnfs_put_layout_hdr(lo);
2118 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2123 pnfs_clear_first_layoutget(lo);
2124 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2125 PNFS_UPDATE_LAYOUT_EXIT);
2126 pnfs_put_layout_hdr(lo);
2128 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
2129 "(%s, offset: %llu, length: %llu)\n",
2130 __func__, ino->i_sb->s_id,
2131 (unsigned long long)NFS_FILEID(ino),
2132 IS_ERR_OR_NULL(lseg) ? "not found" : "found",
2133 iomode==IOMODE_RW ? "read/write" : "read-only",
2134 (unsigned long long)pos,
2135 (unsigned long long)count);
2138 spin_unlock(&ino->i_lock);
2139 goto out_put_layout_hdr;
2141 EXPORT_SYMBOL_GPL(pnfs_update_layout);
2144 pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
2146 switch (range->iomode) {
2153 if (range->offset == NFS4_MAX_UINT64)
2155 if (range->length == 0)
2157 if (range->length != NFS4_MAX_UINT64 &&
2158 range->length > NFS4_MAX_UINT64 - range->offset)
2163 static struct pnfs_layout_hdr *
2164 _pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx)
2166 struct pnfs_layout_hdr *lo;
2168 spin_lock(&ino->i_lock);
2169 lo = pnfs_find_alloc_layout(ino, ctx, GFP_KERNEL);
2172 if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags))
2174 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
2176 if (pnfs_layoutgets_blocked(lo))
2178 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags))
2180 nfs_layoutget_begin(lo);
2181 spin_unlock(&ino->i_lock);
2182 _add_to_server_list(lo, NFS_SERVER(ino));
2186 spin_unlock(&ino->i_lock);
2187 pnfs_put_layout_hdr(lo);
2191 static void _lgopen_prepare_attached(struct nfs4_opendata *data,
2192 struct nfs_open_context *ctx)
2194 struct inode *ino = data->dentry->d_inode;
2195 struct pnfs_layout_range rng = {
2196 .iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2197 IOMODE_RW: IOMODE_READ,
2199 .length = NFS4_MAX_UINT64,
2201 struct nfs4_layoutget *lgp;
2202 struct pnfs_layout_hdr *lo;
2204 /* Heuristic: don't send layoutget if we have cached data */
2205 if (rng.iomode == IOMODE_READ &&
2206 (i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0))
2209 lo = _pnfs_grab_empty_layout(ino, ctx);
2212 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid,
2215 pnfs_clear_first_layoutget(lo);
2216 pnfs_put_layout_hdr(lo);
2220 data->o_arg.lg_args = &lgp->args;
2221 data->o_res.lg_res = &lgp->res;
2224 static void _lgopen_prepare_floating(struct nfs4_opendata *data,
2225 struct nfs_open_context *ctx)
2227 struct pnfs_layout_range rng = {
2228 .iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2229 IOMODE_RW: IOMODE_READ,
2231 .length = NFS4_MAX_UINT64,
2233 struct nfs4_layoutget *lgp;
2235 lgp = pnfs_alloc_init_layoutget_args(NULL, ctx, ¤t_stateid,
2240 data->o_arg.lg_args = &lgp->args;
2241 data->o_res.lg_res = &lgp->res;
2244 void pnfs_lgopen_prepare(struct nfs4_opendata *data,
2245 struct nfs_open_context *ctx)
2247 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
2249 if (!(pnfs_enabled_sb(server) &&
2250 server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN))
2252 /* Could check on max_ops, but currently hardcoded high enough */
2253 if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN))
2256 _lgopen_prepare_attached(data, ctx);
2258 _lgopen_prepare_floating(data, ctx);
2261 void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
2262 struct nfs_open_context *ctx)
2264 struct pnfs_layout_hdr *lo;
2265 struct pnfs_layout_segment *lseg;
2266 struct nfs_server *srv = NFS_SERVER(ino);
2271 dprintk("%s: entered with status %i\n", __func__, lgp->res.status);
2272 if (lgp->res.status) {
2273 switch (lgp->res.status) {
2277 * Halt lgopen attempts if the server doesn't recognise
2278 * the "current stateid" value, the layout type, or the
2279 * layoutget operation as being valid.
2280 * Also if it complains about too many ops in the compound
2281 * or of the request/reply being too big.
2283 case -NFS4ERR_BAD_STATEID:
2284 case -NFS4ERR_NOTSUPP:
2285 case -NFS4ERR_REP_TOO_BIG:
2286 case -NFS4ERR_REP_TOO_BIG_TO_CACHE:
2287 case -NFS4ERR_REQ_TOO_BIG:
2288 case -NFS4ERR_TOO_MANY_OPS:
2289 case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
2290 srv->caps &= ~NFS_CAP_LGOPEN;
2294 if (!lgp->args.inode) {
2295 lo = _pnfs_grab_empty_layout(ino, ctx);
2298 lgp->args.inode = ino;
2300 lo = NFS_I(lgp->args.inode)->layout;
2302 lseg = pnfs_layout_process(lgp);
2303 if (!IS_ERR(lseg)) {
2304 iomode = lgp->args.range.iomode;
2305 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2306 pnfs_put_lseg(lseg);
2310 void nfs4_lgopen_release(struct nfs4_layoutget *lgp)
2313 struct inode *inode = lgp->args.inode;
2315 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
2316 pnfs_clear_first_layoutget(lo);
2317 nfs_layoutget_end(lo);
2319 pnfs_layoutget_free(lgp);
2323 struct pnfs_layout_segment *
2324 pnfs_layout_process(struct nfs4_layoutget *lgp)
2326 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
2327 struct nfs4_layoutget_res *res = &lgp->res;
2328 struct pnfs_layout_segment *lseg;
2329 struct inode *ino = lo->plh_inode;
2332 if (!pnfs_sanity_check_layout_range(&res->range))
2333 return ERR_PTR(-EINVAL);
2335 /* Inject layout blob into I/O device driver */
2336 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
2337 if (IS_ERR_OR_NULL(lseg)) {
2339 lseg = ERR_PTR(-ENOMEM);
2341 dprintk("%s: Could not allocate layout: error %ld\n",
2342 __func__, PTR_ERR(lseg));
2346 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid);
2348 spin_lock(&ino->i_lock);
2349 if (pnfs_layoutgets_blocked(lo)) {
2350 dprintk("%s forget reply due to state\n", __func__);
2354 if (!pnfs_layout_is_valid(lo)) {
2355 /* We have a completely new layout */
2356 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, true);
2357 } else if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
2358 /* existing state ID, make sure the sequence number matches. */
2359 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
2360 dprintk("%s forget reply due to sequence\n", __func__);
2363 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, false);
2366 * We got an entirely new state ID. Mark all segments for the
2367 * inode invalid, and retry the layoutget
2369 pnfs_mark_layout_stateid_invalid(lo, &free_me);
2373 pnfs_get_lseg(lseg);
2374 pnfs_layout_insert_lseg(lo, lseg, &free_me);
2377 if (res->return_on_close)
2378 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
2380 spin_unlock(&ino->i_lock);
2381 pnfs_free_lseg_list(&free_me);
2385 spin_unlock(&ino->i_lock);
2386 lseg->pls_layout = lo;
2387 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
2388 return ERR_PTR(-EAGAIN);
2392 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
2393 * @lo: pointer to layout header
2394 * @tmp_list: list header to be used with pnfs_free_lseg_list()
2395 * @return_range: describe layout segment ranges to be returned
2396 * @seq: stateid seqid to match
2398 * This function is mainly intended for use by layoutrecall. It attempts
2399 * to free the layout segment immediately, or else to mark it for return
2400 * as soon as its reference count drops to zero.
2403 * - 0: a layoutreturn needs to be scheduled.
2404 * - EBUSY: there are layout segment that are still in use.
2405 * - ENOENT: there are no layout segments that need to be returned.
2408 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
2409 struct list_head *tmp_list,
2410 const struct pnfs_layout_range *return_range,
2413 struct pnfs_layout_segment *lseg, *next;
2416 dprintk("%s:Begin lo %p\n", __func__, lo);
2418 assert_spin_locked(&lo->plh_inode->i_lock);
2420 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
2421 if (pnfs_match_lseg_recall(lseg, return_range, seq)) {
2422 dprintk("%s: marking lseg %p iomode %d "
2423 "offset %llu length %llu\n", __func__,
2424 lseg, lseg->pls_range.iomode,
2425 lseg->pls_range.offset,
2426 lseg->pls_range.length);
2427 if (mark_lseg_invalid(lseg, tmp_list))
2430 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
2434 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2438 if (!list_empty(&lo->plh_return_segs)) {
2439 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2447 pnfs_mark_layout_for_return(struct inode *inode,
2448 const struct pnfs_layout_range *range)
2450 struct pnfs_layout_hdr *lo;
2451 bool return_now = false;
2453 spin_lock(&inode->i_lock);
2454 lo = NFS_I(inode)->layout;
2455 if (!pnfs_layout_is_valid(lo)) {
2456 spin_unlock(&inode->i_lock);
2459 pnfs_set_plh_return_info(lo, range->iomode, 0);
2461 * mark all matching lsegs so that we are sure to have no live
2462 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
2465 if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, range, 0) != -EBUSY) {
2466 const struct cred *cred;
2467 nfs4_stateid stateid;
2468 enum pnfs_iomode iomode;
2470 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode);
2471 spin_unlock(&inode->i_lock);
2473 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false);
2475 spin_unlock(&inode->i_lock);
2476 nfs_commit_inode(inode, 0);
2480 void pnfs_error_mark_layout_for_return(struct inode *inode,
2481 struct pnfs_layout_segment *lseg)
2483 struct pnfs_layout_range range = {
2484 .iomode = lseg->pls_range.iomode,
2486 .length = NFS4_MAX_UINT64,
2489 pnfs_mark_layout_for_return(inode, &range);
2491 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
2494 pnfs_layout_can_be_returned(struct pnfs_layout_hdr *lo)
2496 return pnfs_layout_is_valid(lo) &&
2497 !test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) &&
2498 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
2501 static struct pnfs_layout_segment *
2502 pnfs_find_first_lseg(struct pnfs_layout_hdr *lo,
2503 const struct pnfs_layout_range *range,
2504 enum pnfs_iomode iomode)
2506 struct pnfs_layout_segment *lseg;
2508 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
2509 if (!test_bit(NFS_LSEG_VALID, &lseg->pls_flags))
2511 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
2513 if (lseg->pls_range.iomode != iomode && iomode != IOMODE_ANY)
2515 if (pnfs_lseg_range_intersecting(&lseg->pls_range, range))
2521 /* Find open file states whose mode matches that of the range */
2523 pnfs_should_return_unused_layout(struct pnfs_layout_hdr *lo,
2524 const struct pnfs_layout_range *range)
2526 struct list_head *head;
2527 struct nfs_open_context *ctx;
2530 if (!pnfs_layout_can_be_returned(lo) ||
2531 !pnfs_find_first_lseg(lo, range, range->iomode))
2534 head = &NFS_I(lo->plh_inode)->open_files;
2535 list_for_each_entry_rcu(ctx, head, list) {
2537 mode |= ctx->state->state & (FMODE_READ|FMODE_WRITE);
2540 switch (range->iomode) {
2544 mode &= ~FMODE_WRITE;
2547 if (pnfs_find_first_lseg(lo, range, IOMODE_READ))
2548 mode &= ~FMODE_READ;
2554 pnfs_layout_return_unused_byserver(struct nfs_server *server, void *data)
2556 const struct pnfs_layout_range *range = data;
2557 struct pnfs_layout_hdr *lo;
2558 struct inode *inode;
2561 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) {
2562 if (!pnfs_layout_can_be_returned(lo) ||
2563 test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
2565 inode = lo->plh_inode;
2566 spin_lock(&inode->i_lock);
2567 if (!pnfs_should_return_unused_layout(lo, range)) {
2568 spin_unlock(&inode->i_lock);
2571 spin_unlock(&inode->i_lock);
2572 inode = pnfs_grab_inode_layout_hdr(lo);
2576 pnfs_mark_layout_for_return(inode, range);
2586 pnfs_layout_return_unused_byclid(struct nfs_client *clp,
2587 enum pnfs_iomode iomode)
2589 struct pnfs_layout_range range = {
2592 .length = NFS4_MAX_UINT64,
2595 nfs_client_for_each_server(clp, pnfs_layout_return_unused_byserver,
2600 pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio)
2602 if (pgio->pg_lseg == NULL ||
2603 test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags))
2605 pnfs_put_lseg(pgio->pg_lseg);
2606 pgio->pg_lseg = NULL;
2608 EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout);
2611 * Check for any intersection between the request and the pgio->pg_lseg,
2612 * and if none, put this pgio->pg_lseg away.
2615 pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2617 if (pgio->pg_lseg && !pnfs_lseg_request_intersecting(pgio->pg_lseg, req)) {
2618 pnfs_put_lseg(pgio->pg_lseg);
2619 pgio->pg_lseg = NULL;
2622 EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_range);
2625 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2627 u64 rd_size = req->wb_bytes;
2629 pnfs_generic_pg_check_layout(pgio);
2630 pnfs_generic_pg_check_range(pgio, req);
2631 if (pgio->pg_lseg == NULL) {
2632 if (pgio->pg_dreq == NULL)
2633 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
2635 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
2637 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2638 nfs_req_openctx(req),
2644 if (IS_ERR(pgio->pg_lseg)) {
2645 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2646 pgio->pg_lseg = NULL;
2650 /* If no lseg, fall back to read through mds */
2651 if (pgio->pg_lseg == NULL)
2652 nfs_pageio_reset_read_mds(pgio);
2655 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
2658 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
2659 struct nfs_page *req, u64 wb_size)
2661 pnfs_generic_pg_check_layout(pgio);
2662 pnfs_generic_pg_check_range(pgio, req);
2663 if (pgio->pg_lseg == NULL) {
2664 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2665 nfs_req_openctx(req),
2671 if (IS_ERR(pgio->pg_lseg)) {
2672 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2673 pgio->pg_lseg = NULL;
2677 /* If no lseg, fall back to write through mds */
2678 if (pgio->pg_lseg == NULL)
2679 nfs_pageio_reset_write_mds(pgio);
2681 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
2684 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
2686 if (desc->pg_lseg) {
2687 pnfs_put_lseg(desc->pg_lseg);
2688 desc->pg_lseg = NULL;
2691 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
2694 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
2695 * of bytes (maximum @req->wb_bytes) that can be coalesced.
2698 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
2699 struct nfs_page *prev, struct nfs_page *req)
2702 u64 seg_end, req_start, seg_left;
2704 size = nfs_generic_pg_test(pgio, prev, req);
2709 * 'size' contains the number of bytes left in the current page (up
2710 * to the original size asked for in @req->wb_bytes).
2712 * Calculate how many bytes are left in the layout segment
2713 * and if there are less bytes than 'size', return that instead.
2715 * Please also note that 'end_offset' is actually the offset of the
2716 * first byte that lies outside the pnfs_layout_range. FIXME?
2719 if (pgio->pg_lseg) {
2720 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset,
2721 pgio->pg_lseg->pls_range.length);
2722 req_start = req_offset(req);
2724 /* start of request is past the last byte of this segment */
2725 if (req_start >= seg_end)
2728 /* adjust 'size' iff there are fewer bytes left in the
2729 * segment than what nfs_generic_pg_test returned */
2730 seg_left = seg_end - req_start;
2731 if (seg_left < size)
2732 size = (unsigned int)seg_left;
2737 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
2739 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
2741 struct nfs_pageio_descriptor pgio;
2743 /* Resend all requests through the MDS */
2744 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
2745 hdr->completion_ops);
2746 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
2747 return nfs_pageio_resend(&pgio, hdr);
2749 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
2751 static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
2754 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
2755 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2756 PNFS_LAYOUTRET_ON_ERROR) {
2757 pnfs_return_layout(hdr->inode);
2759 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2760 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
2764 * Called by non rpc-based layout drivers
2766 void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
2768 if (likely(!hdr->pnfs_error)) {
2769 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
2770 hdr->mds_offset + hdr->res.count);
2771 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2773 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
2774 if (unlikely(hdr->pnfs_error))
2775 pnfs_ld_handle_write_error(hdr);
2776 hdr->mds_ops->rpc_release(hdr);
2778 EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
2781 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
2782 struct nfs_pgio_header *hdr)
2784 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2786 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2787 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2788 nfs_pageio_reset_write_mds(desc);
2789 mirror->pg_recoalesce = 1;
2791 hdr->completion_ops->completion(hdr);
2794 static enum pnfs_try_status
2795 pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
2796 const struct rpc_call_ops *call_ops,
2797 struct pnfs_layout_segment *lseg,
2800 struct inode *inode = hdr->inode;
2801 enum pnfs_try_status trypnfs;
2802 struct nfs_server *nfss = NFS_SERVER(inode);
2804 hdr->mds_ops = call_ops;
2806 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
2807 inode->i_ino, hdr->args.count, hdr->args.offset, how);
2808 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
2809 if (trypnfs != PNFS_NOT_ATTEMPTED)
2810 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
2811 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2816 pnfs_do_write(struct nfs_pageio_descriptor *desc,
2817 struct nfs_pgio_header *hdr, int how)
2819 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2820 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2821 enum pnfs_try_status trypnfs;
2823 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
2825 case PNFS_NOT_ATTEMPTED:
2826 pnfs_write_through_mds(desc, hdr);
2827 case PNFS_ATTEMPTED:
2829 case PNFS_TRY_AGAIN:
2830 /* cleanup hdr and prepare to redo pnfs */
2831 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2832 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2833 list_splice_init(&hdr->pages, &mirror->pg_list);
2834 mirror->pg_recoalesce = 1;
2836 hdr->mds_ops->rpc_release(hdr);
2840 static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
2842 pnfs_put_lseg(hdr->lseg);
2843 nfs_pgio_header_free(hdr);
2847 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
2849 struct nfs_pgio_header *hdr;
2852 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2854 desc->pg_error = -ENOMEM;
2855 return desc->pg_error;
2857 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
2859 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2860 ret = nfs_generic_pgio(desc, hdr);
2862 pnfs_do_write(desc, hdr, desc->pg_ioflags);
2866 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
2868 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
2870 struct nfs_pageio_descriptor pgio;
2872 /* Resend all requests through the MDS */
2873 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
2874 return nfs_pageio_resend(&pgio, hdr);
2876 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
2878 static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
2880 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
2881 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2882 PNFS_LAYOUTRET_ON_ERROR) {
2883 pnfs_return_layout(hdr->inode);
2885 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2886 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2890 * Called by non rpc-based layout drivers
2892 void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2894 if (likely(!hdr->pnfs_error))
2895 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2896 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2897 if (unlikely(hdr->pnfs_error))
2898 pnfs_ld_handle_read_error(hdr);
2899 hdr->mds_ops->rpc_release(hdr);
2901 EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
2904 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2905 struct nfs_pgio_header *hdr)
2907 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2909 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2910 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2911 nfs_pageio_reset_read_mds(desc);
2912 mirror->pg_recoalesce = 1;
2914 hdr->completion_ops->completion(hdr);
2918 * Call the appropriate parallel I/O subsystem read function.
2920 static enum pnfs_try_status
2921 pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2922 const struct rpc_call_ops *call_ops,
2923 struct pnfs_layout_segment *lseg)
2925 struct inode *inode = hdr->inode;
2926 struct nfs_server *nfss = NFS_SERVER(inode);
2927 enum pnfs_try_status trypnfs;
2929 hdr->mds_ops = call_ops;
2931 dprintk("%s: Reading ino:%lu %u@%llu\n",
2932 __func__, inode->i_ino, hdr->args.count, hdr->args.offset);
2934 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
2935 if (trypnfs != PNFS_NOT_ATTEMPTED)
2936 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
2937 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2941 /* Resend all requests through pnfs. */
2942 void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr,
2943 unsigned int mirror_idx)
2945 struct nfs_pageio_descriptor pgio;
2947 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2948 /* Prevent deadlocks with layoutreturn! */
2949 pnfs_put_lseg(hdr->lseg);
2952 nfs_pageio_init_read(&pgio, hdr->inode, false,
2953 hdr->completion_ops);
2954 pgio.pg_mirror_idx = mirror_idx;
2955 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
2958 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
2961 pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
2963 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2964 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2965 enum pnfs_try_status trypnfs;
2967 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
2969 case PNFS_NOT_ATTEMPTED:
2970 pnfs_read_through_mds(desc, hdr);
2971 case PNFS_ATTEMPTED:
2973 case PNFS_TRY_AGAIN:
2974 /* cleanup hdr and prepare to redo pnfs */
2975 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2976 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2977 list_splice_init(&hdr->pages, &mirror->pg_list);
2978 mirror->pg_recoalesce = 1;
2980 hdr->mds_ops->rpc_release(hdr);
2984 static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
2986 pnfs_put_lseg(hdr->lseg);
2987 nfs_pgio_header_free(hdr);
2991 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
2993 struct nfs_pgio_header *hdr;
2996 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2998 desc->pg_error = -ENOMEM;
2999 return desc->pg_error;
3001 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
3002 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
3003 ret = nfs_generic_pgio(desc, hdr);
3005 pnfs_do_read(desc, hdr);
3008 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
3010 static void pnfs_clear_layoutcommitting(struct inode *inode)
3012 unsigned long *bitlock = &NFS_I(inode)->flags;
3014 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
3015 smp_mb__after_atomic();
3016 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
3020 * There can be multiple RW segments.
3022 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
3024 struct pnfs_layout_segment *lseg;
3026 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
3027 if (lseg->pls_range.iomode == IOMODE_RW &&
3028 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
3029 list_add(&lseg->pls_lc_list, listp);
3033 static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
3035 struct pnfs_layout_segment *lseg, *tmp;
3037 /* Matched by references in pnfs_set_layoutcommit */
3038 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
3039 list_del_init(&lseg->pls_lc_list);
3040 pnfs_put_lseg(lseg);
3043 pnfs_clear_layoutcommitting(inode);
3046 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
3048 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
3050 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
3053 pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
3056 struct nfs_inode *nfsi = NFS_I(inode);
3057 bool mark_as_dirty = false;
3059 spin_lock(&inode->i_lock);
3060 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
3061 nfsi->layout->plh_lwb = end_pos;
3062 mark_as_dirty = true;
3063 dprintk("%s: Set layoutcommit for inode %lu ",
3064 __func__, inode->i_ino);
3065 } else if (end_pos > nfsi->layout->plh_lwb)
3066 nfsi->layout->plh_lwb = end_pos;
3067 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
3068 /* references matched in nfs4_layoutcommit_release */
3069 pnfs_get_lseg(lseg);
3071 spin_unlock(&inode->i_lock);
3072 dprintk("%s: lseg %p end_pos %llu\n",
3073 __func__, lseg, nfsi->layout->plh_lwb);
3075 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
3076 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
3078 mark_inode_dirty_sync(inode);
3080 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
3082 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
3084 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
3086 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
3087 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
3088 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
3092 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
3093 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
3094 * data to disk to allow the server to recover the data if it crashes.
3095 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
3096 * is off, and a COMMIT is sent to a data server, or
3097 * if WRITEs to a data server return NFS_DATA_SYNC.
3100 pnfs_layoutcommit_inode(struct inode *inode, bool sync)
3102 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
3103 struct nfs4_layoutcommit_data *data;
3104 struct nfs_inode *nfsi = NFS_I(inode);
3108 if (!pnfs_layoutcommit_outstanding(inode))
3111 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
3114 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
3117 status = wait_on_bit_lock_action(&nfsi->flags,
3118 NFS_INO_LAYOUTCOMMITTING,
3119 nfs_wait_bit_killable,
3126 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
3127 data = kzalloc(sizeof(*data), GFP_NOFS);
3129 goto clear_layoutcommitting;
3132 spin_lock(&inode->i_lock);
3133 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
3136 INIT_LIST_HEAD(&data->lseg_list);
3137 pnfs_list_write_lseg(inode, &data->lseg_list);
3139 end_pos = nfsi->layout->plh_lwb;
3141 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
3142 data->cred = get_cred(nfsi->layout->plh_lc_cred);
3143 spin_unlock(&inode->i_lock);
3145 data->args.inode = inode;
3146 nfs_fattr_init(&data->fattr);
3147 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
3148 data->res.fattr = &data->fattr;
3150 data->args.lastbytewritten = end_pos - 1;
3152 data->args.lastbytewritten = U64_MAX;
3153 data->res.server = NFS_SERVER(inode);
3155 if (ld->prepare_layoutcommit) {
3156 status = ld->prepare_layoutcommit(&data->args);
3158 put_cred(data->cred);
3159 spin_lock(&inode->i_lock);
3160 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
3161 if (end_pos > nfsi->layout->plh_lwb)
3162 nfsi->layout->plh_lwb = end_pos;
3168 status = nfs4_proc_layoutcommit(data, sync);
3171 mark_inode_dirty_sync(inode);
3172 dprintk("<-- %s status %d\n", __func__, status);
3175 spin_unlock(&inode->i_lock);
3177 clear_layoutcommitting:
3178 pnfs_clear_layoutcommitting(inode);
3181 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
3184 pnfs_generic_sync(struct inode *inode, bool datasync)
3186 return pnfs_layoutcommit_inode(inode, true);
3188 EXPORT_SYMBOL_GPL(pnfs_generic_sync);
3190 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
3192 struct nfs4_threshold *thp;
3194 thp = kzalloc(sizeof(*thp), GFP_NOFS);
3196 dprintk("%s mdsthreshold allocation failed\n", __func__);
3202 #if IS_ENABLED(CONFIG_NFS_V4_2)
3204 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
3206 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
3207 struct nfs_server *server = NFS_SERVER(inode);
3208 struct nfs_inode *nfsi = NFS_I(inode);
3209 struct nfs42_layoutstat_data *data;
3210 struct pnfs_layout_hdr *hdr;
3213 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
3216 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
3219 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
3222 spin_lock(&inode->i_lock);
3223 if (!NFS_I(inode)->layout) {
3224 spin_unlock(&inode->i_lock);
3225 goto out_clear_layoutstats;
3227 hdr = NFS_I(inode)->layout;
3228 pnfs_get_layout_hdr(hdr);
3229 spin_unlock(&inode->i_lock);
3231 data = kzalloc(sizeof(*data), gfp_flags);
3237 data->args.fh = NFS_FH(inode);
3238 data->args.inode = inode;
3239 status = ld->prepare_layoutstats(&data->args);
3243 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
3246 dprintk("%s returns %d\n", __func__, status);
3252 pnfs_put_layout_hdr(hdr);
3253 out_clear_layoutstats:
3254 smp_mb__before_atomic();
3255 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
3256 smp_mb__after_atomic();
3259 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
3262 unsigned int layoutstats_timer;
3263 module_param(layoutstats_timer, uint, 0644);
3264 EXPORT_SYMBOL_GPL(layoutstats_timer);