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 (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) {
283 struct nfs_client *clp = server->nfs_client;
285 spin_lock(&clp->cl_lock);
286 list_del_rcu(&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))
328 static struct inode *
329 pnfs_grab_inode_layout_hdr(struct pnfs_layout_hdr *lo)
331 struct inode *inode = igrab(lo->plh_inode);
334 set_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags);
339 * Compare 2 layout stateid sequence ids, to see which is newer,
340 * taking into account wraparound issues.
342 static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
344 return (s32)(s1 - s2) > 0;
347 static void pnfs_barrier_update(struct pnfs_layout_hdr *lo, u32 newseq)
349 if (pnfs_seqid_is_newer(newseq, lo->plh_barrier) || !lo->plh_barrier)
350 lo->plh_barrier = newseq;
354 pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
357 if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode)
359 lo->plh_return_iomode = iomode;
360 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
362 * We must set lo->plh_return_seq to avoid livelocks with
363 * pnfs_layout_need_return()
366 seq = be32_to_cpu(lo->plh_stateid.seqid);
367 if (!lo->plh_return_seq || pnfs_seqid_is_newer(seq, lo->plh_return_seq))
368 lo->plh_return_seq = seq;
369 pnfs_barrier_update(lo, seq);
373 pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo)
375 struct pnfs_layout_segment *lseg;
376 lo->plh_return_iomode = 0;
377 lo->plh_return_seq = 0;
378 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
379 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
380 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
382 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
386 static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
388 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
389 clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags);
390 smp_mb__after_atomic();
391 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
392 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
396 pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg,
397 struct list_head *free_me)
399 clear_bit(NFS_LSEG_ROC, &lseg->pls_flags);
400 clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
401 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags))
402 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
403 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
404 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
408 * Update the seqid of a layout stateid after receiving
409 * NFS4ERR_OLD_STATEID
411 bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
412 struct pnfs_layout_range *dst_range,
415 struct pnfs_layout_hdr *lo;
416 struct pnfs_layout_range range = {
417 .iomode = IOMODE_ANY,
419 .length = NFS4_MAX_UINT64,
425 spin_lock(&inode->i_lock);
426 lo = NFS_I(inode)->layout;
427 if (lo && pnfs_layout_is_valid(lo) &&
428 nfs4_stateid_match_other(dst, &lo->plh_stateid)) {
429 /* Is our call using the most recent seqid? If so, bump it */
430 if (!nfs4_stateid_is_newer(&lo->plh_stateid, dst)) {
431 nfs4_stateid_seqid_inc(dst);
435 /* Try to update the seqid to the most recent */
436 err = pnfs_mark_matching_lsegs_return(lo, &head, &range, 0);
438 dst->seqid = lo->plh_stateid.seqid;
444 spin_unlock(&inode->i_lock);
445 pnfs_free_lseg_list(&head);
450 * Mark a pnfs_layout_hdr and all associated layout segments as invalid
452 * In order to continue using the pnfs_layout_hdr, a full recovery
454 * Note that caller must hold inode->i_lock.
457 pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
458 struct list_head *lseg_list)
460 struct pnfs_layout_range range = {
461 .iomode = IOMODE_ANY,
463 .length = NFS4_MAX_UINT64,
465 struct pnfs_layout_segment *lseg, *next;
467 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
468 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
469 pnfs_clear_lseg_state(lseg, lseg_list);
470 pnfs_clear_layoutreturn_info(lo);
471 pnfs_free_returned_lsegs(lo, lseg_list, &range, 0);
472 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) &&
473 !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
474 pnfs_clear_layoutreturn_waitbit(lo);
475 return !list_empty(&lo->plh_segs);
479 pnfs_iomode_to_fail_bit(u32 iomode)
481 return iomode == IOMODE_RW ?
482 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
486 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
488 lo->plh_retry_timestamp = jiffies;
489 if (!test_and_set_bit(fail_bit, &lo->plh_flags))
490 refcount_inc(&lo->plh_refcount);
494 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
496 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
497 refcount_dec(&lo->plh_refcount);
501 pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
503 struct inode *inode = lo->plh_inode;
504 struct pnfs_layout_range range = {
507 .length = NFS4_MAX_UINT64,
511 spin_lock(&inode->i_lock);
512 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
513 pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0);
514 spin_unlock(&inode->i_lock);
515 pnfs_free_lseg_list(&head);
516 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
517 iomode == IOMODE_RW ? "RW" : "READ");
521 pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
523 unsigned long start, end;
524 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
526 if (test_bit(fail_bit, &lo->plh_flags) == 0)
529 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
530 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
531 /* It is time to retry the failed layoutgets */
532 pnfs_layout_clear_fail_bit(lo, fail_bit);
539 pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg,
540 const struct pnfs_layout_range *range,
541 const nfs4_stateid *stateid)
543 INIT_LIST_HEAD(&lseg->pls_list);
544 INIT_LIST_HEAD(&lseg->pls_lc_list);
545 INIT_LIST_HEAD(&lseg->pls_commits);
546 refcount_set(&lseg->pls_refcount, 1);
547 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
548 lseg->pls_layout = lo;
549 lseg->pls_range = *range;
550 lseg->pls_seq = be32_to_cpu(stateid->seqid);
553 static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
556 struct inode *inode = lseg->pls_layout->plh_inode;
557 NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg);
562 pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
563 struct pnfs_layout_segment *lseg)
565 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
566 list_del_init(&lseg->pls_list);
567 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
568 refcount_dec(&lo->plh_refcount);
569 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
571 if (list_empty(&lo->plh_segs) &&
572 !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
573 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
574 if (atomic_read(&lo->plh_outstanding) == 0)
575 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
576 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
581 pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo,
582 struct pnfs_layout_segment *lseg)
584 if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
585 pnfs_layout_is_valid(lo)) {
586 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
587 list_move_tail(&lseg->pls_list, &lo->plh_return_segs);
594 pnfs_put_lseg(struct pnfs_layout_segment *lseg)
596 struct pnfs_layout_hdr *lo;
602 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
603 refcount_read(&lseg->pls_refcount),
604 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
606 lo = lseg->pls_layout;
607 inode = lo->plh_inode;
609 if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
610 pnfs_get_layout_hdr(lo);
611 pnfs_layout_remove_lseg(lo, lseg);
612 if (pnfs_cache_lseg_for_layoutreturn(lo, lseg))
614 spin_unlock(&inode->i_lock);
615 pnfs_free_lseg(lseg);
616 pnfs_put_layout_hdr(lo);
619 EXPORT_SYMBOL_GPL(pnfs_put_lseg);
622 * is l2 fully contained in l1?
624 * [----------------------------------)
629 pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
630 const struct pnfs_layout_range *l2)
632 u64 start1 = l1->offset;
633 u64 end1 = pnfs_end_offset(start1, l1->length);
634 u64 start2 = l2->offset;
635 u64 end2 = pnfs_end_offset(start2, l2->length);
637 return (start1 <= start2) && (end1 >= end2);
640 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
641 struct list_head *tmp_list)
643 if (!refcount_dec_and_test(&lseg->pls_refcount))
645 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
646 list_add(&lseg->pls_list, tmp_list);
650 /* Returns 1 if lseg is removed from list, 0 otherwise */
651 static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
652 struct list_head *tmp_list)
656 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
657 /* Remove the reference keeping the lseg in the
658 * list. It will now be removed when all
659 * outstanding io is finished.
661 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
662 refcount_read(&lseg->pls_refcount));
663 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
670 pnfs_should_free_range(const struct pnfs_layout_range *lseg_range,
671 const struct pnfs_layout_range *recall_range)
673 return (recall_range->iomode == IOMODE_ANY ||
674 lseg_range->iomode == recall_range->iomode) &&
675 pnfs_lseg_range_intersecting(lseg_range, recall_range);
679 pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg,
680 const struct pnfs_layout_range *recall_range,
683 if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq))
685 if (recall_range == NULL)
687 return pnfs_should_free_range(&lseg->pls_range, recall_range);
691 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later
692 * @lo: layout header containing the lsegs
693 * @tmp_list: list head where doomed lsegs should go
694 * @recall_range: optional recall range argument to match (may be NULL)
695 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0)
697 * Walk the list of lsegs in the layout header, and tear down any that should
698 * be destroyed. If "recall_range" is specified then the segment must match
699 * that range. If "seq" is non-zero, then only match segments that were handed
700 * out at or before that sequence.
702 * Returns number of matching invalid lsegs remaining in list after scanning
703 * it and purging them.
706 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
707 struct list_head *tmp_list,
708 const struct pnfs_layout_range *recall_range,
711 struct pnfs_layout_segment *lseg, *next;
714 dprintk("%s:Begin lo %p\n", __func__, lo);
716 if (list_empty(&lo->plh_segs))
718 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
719 if (pnfs_match_lseg_recall(lseg, recall_range, seq)) {
720 dprintk("%s: freeing lseg %p iomode %d seq %u "
721 "offset %llu length %llu\n", __func__,
722 lseg, lseg->pls_range.iomode, lseg->pls_seq,
723 lseg->pls_range.offset, lseg->pls_range.length);
724 if (!mark_lseg_invalid(lseg, tmp_list))
727 dprintk("%s:Return %i\n", __func__, remaining);
732 pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
733 struct list_head *free_me,
734 const struct pnfs_layout_range *range,
737 struct pnfs_layout_segment *lseg, *next;
739 list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) {
740 if (pnfs_match_lseg_recall(lseg, range, seq))
741 list_move_tail(&lseg->pls_list, free_me);
745 /* note free_me must contain lsegs from a single layout_hdr */
747 pnfs_free_lseg_list(struct list_head *free_me)
749 struct pnfs_layout_segment *lseg, *tmp;
751 if (list_empty(free_me))
754 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
755 list_del(&lseg->pls_list);
756 pnfs_free_lseg(lseg);
760 static struct pnfs_layout_hdr *__pnfs_destroy_layout(struct nfs_inode *nfsi)
762 struct pnfs_layout_hdr *lo;
765 spin_lock(&nfsi->vfs_inode.i_lock);
768 pnfs_get_layout_hdr(lo);
769 pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
770 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
771 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
772 spin_unlock(&nfsi->vfs_inode.i_lock);
773 pnfs_free_lseg_list(&tmp_list);
774 nfs_commit_inode(&nfsi->vfs_inode, 0);
775 pnfs_put_layout_hdr(lo);
777 spin_unlock(&nfsi->vfs_inode.i_lock);
781 void pnfs_destroy_layout(struct nfs_inode *nfsi)
783 __pnfs_destroy_layout(nfsi);
785 EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
787 static bool pnfs_layout_removed(struct nfs_inode *nfsi,
788 struct pnfs_layout_hdr *lo)
792 spin_lock(&nfsi->vfs_inode.i_lock);
793 ret = nfsi->layout != lo;
794 spin_unlock(&nfsi->vfs_inode.i_lock);
798 void pnfs_destroy_layout_final(struct nfs_inode *nfsi)
800 struct pnfs_layout_hdr *lo = __pnfs_destroy_layout(nfsi);
803 wait_var_event(lo, pnfs_layout_removed(nfsi, lo));
807 pnfs_layout_add_bulk_destroy_list(struct inode *inode,
808 struct list_head *layout_list)
810 struct pnfs_layout_hdr *lo;
813 spin_lock(&inode->i_lock);
814 lo = NFS_I(inode)->layout;
815 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
816 pnfs_get_layout_hdr(lo);
817 list_add(&lo->plh_bulk_destroy, layout_list);
820 spin_unlock(&inode->i_lock);
824 /* Caller must hold rcu_read_lock and clp->cl_lock */
826 pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
827 struct nfs_server *server,
828 struct list_head *layout_list)
829 __must_hold(&clp->cl_lock)
832 struct pnfs_layout_hdr *lo, *next;
835 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
836 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
837 test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) ||
838 !list_empty(&lo->plh_bulk_destroy))
840 /* If the sb is being destroyed, just bail */
841 if (!nfs_sb_active(server->super))
843 inode = pnfs_grab_inode_layout_hdr(lo);
845 if (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags))
846 list_del_rcu(&lo->plh_layouts);
847 if (pnfs_layout_add_bulk_destroy_list(inode,
851 spin_unlock(&clp->cl_lock);
855 spin_unlock(&clp->cl_lock);
857 nfs_sb_deactive(server->super);
858 spin_lock(&clp->cl_lock);
866 pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
869 struct pnfs_layout_hdr *lo;
871 LIST_HEAD(lseg_list);
874 while (!list_empty(layout_list)) {
875 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
877 dprintk("%s freeing layout for inode %lu\n", __func__,
878 lo->plh_inode->i_ino);
879 inode = lo->plh_inode;
881 pnfs_layoutcommit_inode(inode, false);
883 spin_lock(&inode->i_lock);
884 list_del_init(&lo->plh_bulk_destroy);
885 if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
887 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
890 spin_unlock(&inode->i_lock);
891 pnfs_free_lseg_list(&lseg_list);
892 /* Free all lsegs that are attached to commit buckets */
893 nfs_commit_inode(inode, 0);
894 pnfs_put_layout_hdr(lo);
895 nfs_iput_and_deactive(inode);
901 pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
902 struct nfs_fsid *fsid,
905 struct nfs_server *server;
906 LIST_HEAD(layout_list);
908 spin_lock(&clp->cl_lock);
911 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
912 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
914 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
920 spin_unlock(&clp->cl_lock);
922 if (list_empty(&layout_list))
924 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
928 pnfs_destroy_layouts_byclid(struct nfs_client *clp,
931 struct nfs_server *server;
932 LIST_HEAD(layout_list);
934 spin_lock(&clp->cl_lock);
937 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
938 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
944 spin_unlock(&clp->cl_lock);
946 if (list_empty(&layout_list))
948 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
952 * Called by the state manager to remove all layouts established under an
956 pnfs_destroy_all_layouts(struct nfs_client *clp)
958 nfs4_deviceid_mark_client_invalid(clp);
959 nfs4_deviceid_purge_client(clp);
961 pnfs_destroy_layouts_byclid(clp, false);
965 pnfs_set_layout_cred(struct pnfs_layout_hdr *lo, const struct cred *cred)
967 const struct cred *old;
969 if (cred && cred_fscmp(lo->plh_lc_cred, cred) != 0) {
970 old = xchg(&lo->plh_lc_cred, get_cred(cred));
975 /* update lo->plh_stateid with new if is more recent */
977 pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
978 const struct cred *cred, bool update_barrier)
980 u32 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
981 u32 newseq = be32_to_cpu(new->seqid);
983 if (!pnfs_layout_is_valid(lo)) {
984 pnfs_set_layout_cred(lo, cred);
985 nfs4_stateid_copy(&lo->plh_stateid, new);
986 lo->plh_barrier = newseq;
987 pnfs_clear_layoutreturn_info(lo);
988 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
992 if (pnfs_seqid_is_newer(newseq, oldseq))
993 nfs4_stateid_copy(&lo->plh_stateid, new);
995 if (update_barrier) {
996 pnfs_barrier_update(lo, newseq);
1000 * Because of wraparound, we want to keep the barrier
1001 * "close" to the current seqids. We really only want to
1002 * get here from a layoutget call.
1004 if (atomic_read(&lo->plh_outstanding) == 1)
1005 pnfs_barrier_update(lo, be32_to_cpu(lo->plh_stateid.seqid));
1009 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
1010 const nfs4_stateid *stateid)
1012 u32 seqid = be32_to_cpu(stateid->seqid);
1014 return lo->plh_barrier && pnfs_seqid_is_newer(lo->plh_barrier, seqid);
1017 /* lget is set to 1 if called from inside send_layoutget call chain */
1019 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
1021 return lo->plh_block_lgets ||
1022 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
1025 static struct nfs_server *
1026 pnfs_find_server(struct inode *inode, struct nfs_open_context *ctx)
1028 struct nfs_server *server;
1031 server = NFS_SERVER(inode);
1033 struct dentry *parent_dir = dget_parent(ctx->dentry);
1034 server = NFS_SERVER(parent_dir->d_inode);
1040 static void nfs4_free_pages(struct page **pages, size_t size)
1047 for (i = 0; i < size; i++) {
1050 __free_page(pages[i]);
1055 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
1057 struct page **pages;
1060 pages = kmalloc_array(size, sizeof(struct page *), gfp_flags);
1062 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
1066 for (i = 0; i < size; i++) {
1067 pages[i] = alloc_page(gfp_flags);
1069 dprintk("%s: failed to allocate page\n", __func__);
1070 nfs4_free_pages(pages, i);
1078 static struct nfs4_layoutget *
1079 pnfs_alloc_init_layoutget_args(struct inode *ino,
1080 struct nfs_open_context *ctx,
1081 const nfs4_stateid *stateid,
1082 const struct pnfs_layout_range *range,
1085 struct nfs_server *server = pnfs_find_server(ino, ctx);
1086 size_t max_reply_sz = server->pnfs_curr_ld->max_layoutget_response;
1087 size_t max_pages = max_response_pages(server);
1088 struct nfs4_layoutget *lgp;
1090 dprintk("--> %s\n", __func__);
1092 lgp = kzalloc(sizeof(*lgp), gfp_flags);
1097 size_t npages = (max_reply_sz + PAGE_SIZE - 1) >> PAGE_SHIFT;
1098 if (npages < max_pages)
1102 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
1103 if (!lgp->args.layout.pages) {
1107 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
1108 lgp->res.layoutp = &lgp->args.layout;
1110 /* Don't confuse uninitialised result and success */
1111 lgp->res.status = -NFS4ERR_DELAY;
1113 lgp->args.minlength = PAGE_SIZE;
1114 if (lgp->args.minlength > range->length)
1115 lgp->args.minlength = range->length;
1117 loff_t i_size = i_size_read(ino);
1119 if (range->iomode == IOMODE_READ) {
1120 if (range->offset >= i_size)
1121 lgp->args.minlength = 0;
1122 else if (i_size - range->offset < lgp->args.minlength)
1123 lgp->args.minlength = i_size - range->offset;
1126 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
1127 pnfs_copy_range(&lgp->args.range, range);
1128 lgp->args.type = server->pnfs_curr_ld->id;
1129 lgp->args.inode = ino;
1130 lgp->args.ctx = get_nfs_open_context(ctx);
1131 nfs4_stateid_copy(&lgp->args.stateid, stateid);
1132 lgp->gfp_flags = gfp_flags;
1133 lgp->cred = ctx->cred;
1137 void pnfs_layoutget_free(struct nfs4_layoutget *lgp)
1139 size_t max_pages = lgp->args.layout.pglen / PAGE_SIZE;
1141 nfs4_free_pages(lgp->args.layout.pages, max_pages);
1142 pnfs_put_layout_hdr(lgp->lo);
1143 put_nfs_open_context(lgp->args.ctx);
1147 static void pnfs_clear_layoutcommit(struct inode *inode,
1148 struct list_head *head)
1150 struct nfs_inode *nfsi = NFS_I(inode);
1151 struct pnfs_layout_segment *lseg, *tmp;
1153 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1155 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
1156 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
1158 pnfs_lseg_dec_and_remove_zero(lseg, head);
1162 void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
1163 const nfs4_stateid *arg_stateid,
1164 const struct pnfs_layout_range *range,
1165 const nfs4_stateid *stateid)
1167 struct inode *inode = lo->plh_inode;
1170 spin_lock(&inode->i_lock);
1171 if (!pnfs_layout_is_valid(lo) ||
1172 !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid))
1175 u32 seq = be32_to_cpu(arg_stateid->seqid);
1177 pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq);
1178 pnfs_free_returned_lsegs(lo, &freeme, range, seq);
1179 pnfs_set_layout_stateid(lo, stateid, NULL, true);
1181 pnfs_mark_layout_stateid_invalid(lo, &freeme);
1183 pnfs_clear_layoutreturn_waitbit(lo);
1184 spin_unlock(&inode->i_lock);
1185 pnfs_free_lseg_list(&freeme);
1190 pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo,
1191 nfs4_stateid *stateid,
1192 const struct cred **cred,
1193 enum pnfs_iomode *iomode)
1195 /* Serialise LAYOUTGET/LAYOUTRETURN */
1196 if (atomic_read(&lo->plh_outstanding) != 0)
1198 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
1200 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
1201 pnfs_get_layout_hdr(lo);
1202 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1203 *cred = get_cred(lo->plh_lc_cred);
1204 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
1205 if (lo->plh_return_seq != 0)
1206 stateid->seqid = cpu_to_be32(lo->plh_return_seq);
1208 *iomode = lo->plh_return_iomode;
1209 pnfs_clear_layoutreturn_info(lo);
1210 } else if (iomode != NULL)
1211 *iomode = IOMODE_ANY;
1212 pnfs_barrier_update(lo, be32_to_cpu(stateid->seqid));
1217 pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args,
1218 struct pnfs_layout_hdr *lo,
1219 const nfs4_stateid *stateid,
1220 enum pnfs_iomode iomode)
1222 struct inode *inode = lo->plh_inode;
1224 args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id;
1225 args->inode = inode;
1226 args->range.iomode = iomode;
1227 args->range.offset = 0;
1228 args->range.length = NFS4_MAX_UINT64;
1230 nfs4_stateid_copy(&args->stateid, stateid);
1234 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo,
1235 const nfs4_stateid *stateid,
1236 const struct cred **pcred,
1237 enum pnfs_iomode iomode,
1240 struct inode *ino = lo->plh_inode;
1241 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1242 struct nfs4_layoutreturn *lrp;
1243 const struct cred *cred = *pcred;
1247 lrp = kzalloc(sizeof(*lrp), nfs_io_gfp_mask());
1248 if (unlikely(lrp == NULL)) {
1250 spin_lock(&ino->i_lock);
1251 pnfs_clear_layoutreturn_waitbit(lo);
1252 spin_unlock(&ino->i_lock);
1254 pnfs_put_layout_hdr(lo);
1258 pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode);
1259 lrp->args.ld_private = &lrp->ld_private;
1260 lrp->clp = NFS_SERVER(ino)->nfs_client;
1262 if (ld->prepare_layoutreturn)
1263 ld->prepare_layoutreturn(&lrp->args);
1265 status = nfs4_proc_layoutreturn(lrp, sync);
1267 dprintk("<-- %s status: %d\n", __func__, status);
1272 pnfs_layout_segments_returnable(struct pnfs_layout_hdr *lo,
1273 enum pnfs_iomode iomode,
1276 struct pnfs_layout_range recall_range = {
1277 .length = NFS4_MAX_UINT64,
1280 return pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs,
1281 &recall_range, seq) != -EBUSY;
1284 /* Return true if layoutreturn is needed */
1286 pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
1288 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1290 return pnfs_layout_segments_returnable(lo, lo->plh_return_iomode,
1291 lo->plh_return_seq);
1294 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo)
1296 struct inode *inode= lo->plh_inode;
1298 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1300 spin_lock(&inode->i_lock);
1301 if (pnfs_layout_need_return(lo)) {
1302 const struct cred *cred;
1303 nfs4_stateid stateid;
1304 enum pnfs_iomode iomode;
1307 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode);
1308 spin_unlock(&inode->i_lock);
1310 /* Send an async layoutreturn so we dont deadlock */
1311 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false);
1314 spin_unlock(&inode->i_lock);
1318 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
1319 * when the layout segment list is empty.
1321 * Note that a pnfs_layout_hdr can exist with an empty layout segment
1322 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
1323 * deviceid is marked invalid.
1326 _pnfs_return_layout(struct inode *ino)
1328 struct pnfs_layout_hdr *lo = NULL;
1329 struct nfs_inode *nfsi = NFS_I(ino);
1330 struct pnfs_layout_range range = {
1331 .iomode = IOMODE_ANY,
1333 .length = NFS4_MAX_UINT64,
1335 LIST_HEAD(tmp_list);
1336 const struct cred *cred;
1337 nfs4_stateid stateid;
1339 bool send, valid_layout;
1341 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
1343 spin_lock(&ino->i_lock);
1346 spin_unlock(&ino->i_lock);
1347 dprintk("NFS: %s no layout to return\n", __func__);
1350 /* Reference matched in nfs4_layoutreturn_release */
1351 pnfs_get_layout_hdr(lo);
1352 /* Is there an outstanding layoutreturn ? */
1353 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1354 spin_unlock(&ino->i_lock);
1355 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1356 TASK_UNINTERRUPTIBLE))
1357 goto out_put_layout_hdr;
1358 spin_lock(&ino->i_lock);
1360 valid_layout = pnfs_layout_is_valid(lo);
1361 pnfs_clear_layoutcommit(ino, &tmp_list);
1362 pnfs_mark_matching_lsegs_return(lo, &tmp_list, &range, 0);
1364 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range)
1365 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
1367 /* Don't send a LAYOUTRETURN if list was initially empty */
1368 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) ||
1370 spin_unlock(&ino->i_lock);
1371 dprintk("NFS: %s no layout segments to return\n", __func__);
1372 goto out_wait_layoutreturn;
1375 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, NULL);
1376 spin_unlock(&ino->i_lock);
1378 status = pnfs_send_layoutreturn(lo, &stateid, &cred, IOMODE_ANY, true);
1379 out_wait_layoutreturn:
1380 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, TASK_UNINTERRUPTIBLE);
1382 pnfs_free_lseg_list(&tmp_list);
1383 pnfs_put_layout_hdr(lo);
1385 dprintk("<-- %s status: %d\n", __func__, status);
1390 pnfs_commit_and_return_layout(struct inode *inode)
1392 struct pnfs_layout_hdr *lo;
1395 spin_lock(&inode->i_lock);
1396 lo = NFS_I(inode)->layout;
1398 spin_unlock(&inode->i_lock);
1401 pnfs_get_layout_hdr(lo);
1402 /* Block new layoutgets and read/write to ds */
1403 lo->plh_block_lgets++;
1404 spin_unlock(&inode->i_lock);
1405 filemap_fdatawait(inode->i_mapping);
1406 ret = pnfs_layoutcommit_inode(inode, true);
1408 ret = _pnfs_return_layout(inode);
1409 spin_lock(&inode->i_lock);
1410 lo->plh_block_lgets--;
1411 spin_unlock(&inode->i_lock);
1412 pnfs_put_layout_hdr(lo);
1416 bool pnfs_roc(struct inode *ino,
1417 struct nfs4_layoutreturn_args *args,
1418 struct nfs4_layoutreturn_res *res,
1419 const struct cred *cred)
1421 struct nfs_inode *nfsi = NFS_I(ino);
1422 struct nfs_open_context *ctx;
1423 struct nfs4_state *state;
1424 struct pnfs_layout_hdr *lo;
1425 struct pnfs_layout_segment *lseg, *next;
1426 const struct cred *lc_cred;
1427 nfs4_stateid stateid;
1428 enum pnfs_iomode iomode = 0;
1429 bool layoutreturn = false, roc = false;
1430 bool skip_read = false;
1432 if (!nfs_have_layout(ino))
1436 spin_lock(&ino->i_lock);
1438 if (!lo || !pnfs_layout_is_valid(lo) ||
1439 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1443 pnfs_get_layout_hdr(lo);
1444 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1445 spin_unlock(&ino->i_lock);
1447 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1448 TASK_UNINTERRUPTIBLE);
1449 pnfs_put_layout_hdr(lo);
1453 /* no roc if we hold a delegation */
1454 if (nfs4_check_delegation(ino, FMODE_READ)) {
1455 if (nfs4_check_delegation(ino, FMODE_WRITE))
1460 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1464 /* Don't return layout if there is open file state */
1465 if (state->state & FMODE_WRITE)
1467 if (state->state & FMODE_READ)
1472 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) {
1473 if (skip_read && lseg->pls_range.iomode == IOMODE_READ)
1475 /* If we are sending layoutreturn, invalidate all valid lsegs */
1476 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags))
1479 * Note: mark lseg for return so pnfs_layout_remove_lseg
1480 * doesn't invalidate the layout for us.
1482 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1483 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs))
1485 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
1488 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1491 /* ROC in two conditions:
1492 * 1. there are ROC lsegs
1493 * 2. we don't send layoutreturn
1495 /* lo ref dropped in pnfs_roc_release() */
1496 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &lc_cred, &iomode);
1497 /* If the creds don't match, we can't compound the layoutreturn */
1498 if (!layoutreturn || cred_fscmp(cred, lc_cred) != 0)
1502 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode);
1503 res->lrs_present = 0;
1504 layoutreturn = false;
1508 spin_unlock(&ino->i_lock);
1510 pnfs_layoutcommit_inode(ino, true);
1512 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1513 if (ld->prepare_layoutreturn)
1514 ld->prepare_layoutreturn(args);
1515 pnfs_put_layout_hdr(lo);
1519 pnfs_send_layoutreturn(lo, &stateid, &lc_cred, iomode, true);
1520 pnfs_put_layout_hdr(lo);
1524 int pnfs_roc_done(struct rpc_task *task, struct nfs4_layoutreturn_args **argpp,
1525 struct nfs4_layoutreturn_res **respp, int *ret)
1527 struct nfs4_layoutreturn_args *arg = *argpp;
1528 int retval = -EAGAIN;
1532 /* Handle Layoutreturn errors */
1537 case -NFS4ERR_NOMATCHING_LAYOUT:
1538 /* Was there an RPC level error? If not, retry */
1539 if (task->tk_rpc_status == 0)
1541 /* If the call was not sent, let caller handle it */
1542 if (!RPC_WAS_SENT(task))
1545 * Otherwise, assume the call succeeded and
1546 * that we need to release the layout
1549 (*respp)->lrs_present = 0;
1552 case -NFS4ERR_DELAY:
1553 /* Let the caller handle the retry */
1554 *ret = -NFS4ERR_NOMATCHING_LAYOUT;
1556 case -NFS4ERR_OLD_STATEID:
1557 if (!nfs4_layout_refresh_old_stateid(&arg->stateid,
1558 &arg->range, arg->inode))
1560 *ret = -NFS4ERR_NOMATCHING_LAYOUT;
1568 void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
1569 struct nfs4_layoutreturn_res *res,
1572 struct pnfs_layout_hdr *lo = args->layout;
1573 struct inode *inode = args->inode;
1574 const nfs4_stateid *res_stateid = NULL;
1575 struct nfs4_xdr_opaque_data *ld_private = args->ld_private;
1578 case -NFS4ERR_NOMATCHING_LAYOUT:
1579 spin_lock(&inode->i_lock);
1580 if (pnfs_layout_is_valid(lo) &&
1581 nfs4_stateid_match_other(&args->stateid, &lo->plh_stateid))
1582 pnfs_set_plh_return_info(lo, args->range.iomode, 0);
1583 pnfs_clear_layoutreturn_waitbit(lo);
1584 spin_unlock(&inode->i_lock);
1587 if (res->lrs_present)
1588 res_stateid = &res->stateid;
1591 pnfs_layoutreturn_free_lsegs(lo, &args->stateid, &args->range,
1594 trace_nfs4_layoutreturn_on_close(args->inode, &args->stateid, ret);
1595 if (ld_private && ld_private->ops && ld_private->ops->free)
1596 ld_private->ops->free(ld_private);
1597 pnfs_put_layout_hdr(lo);
1600 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1602 struct nfs_inode *nfsi = NFS_I(ino);
1603 struct pnfs_layout_hdr *lo;
1606 /* we might not have grabbed lo reference. so need to check under
1608 spin_lock(&ino->i_lock);
1610 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1611 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
1614 spin_unlock(&ino->i_lock);
1619 * Compare two layout segments for sorting into layout cache.
1620 * We want to preferentially return RW over RO layouts, so ensure those
1624 pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1625 const struct pnfs_layout_range *l2)
1629 /* high offset > low offset */
1630 d = l1->offset - l2->offset;
1634 /* short length > long length */
1635 d = l2->length - l1->length;
1639 /* read > read/write */
1640 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1644 pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1645 const struct pnfs_layout_range *l2)
1647 return pnfs_lseg_range_cmp(l1, l2) > 0;
1651 pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1652 struct pnfs_layout_segment *old)
1658 pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1659 struct pnfs_layout_segment *lseg,
1660 bool (*is_after)(const struct pnfs_layout_range *,
1661 const struct pnfs_layout_range *),
1662 bool (*do_merge)(struct pnfs_layout_segment *,
1663 struct pnfs_layout_segment *),
1664 struct list_head *free_me)
1666 struct pnfs_layout_segment *lp, *tmp;
1668 dprintk("%s:Begin\n", __func__);
1670 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1671 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1673 if (do_merge(lseg, lp)) {
1674 mark_lseg_invalid(lp, free_me);
1677 if (is_after(&lseg->pls_range, &lp->pls_range))
1679 list_add_tail(&lseg->pls_list, &lp->pls_list);
1680 dprintk("%s: inserted lseg %p "
1681 "iomode %d offset %llu length %llu before "
1682 "lp %p iomode %d offset %llu length %llu\n",
1683 __func__, lseg, lseg->pls_range.iomode,
1684 lseg->pls_range.offset, lseg->pls_range.length,
1685 lp, lp->pls_range.iomode, lp->pls_range.offset,
1686 lp->pls_range.length);
1689 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1690 dprintk("%s: inserted lseg %p "
1691 "iomode %d offset %llu length %llu at tail\n",
1692 __func__, lseg, lseg->pls_range.iomode,
1693 lseg->pls_range.offset, lseg->pls_range.length);
1695 pnfs_get_layout_hdr(lo);
1697 dprintk("%s:Return\n", __func__);
1699 EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1702 pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1703 struct pnfs_layout_segment *lseg,
1704 struct list_head *free_me)
1706 struct inode *inode = lo->plh_inode;
1707 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1709 if (ld->add_lseg != NULL)
1710 ld->add_lseg(lo, lseg, free_me);
1712 pnfs_generic_layout_insert_lseg(lo, lseg,
1713 pnfs_lseg_range_is_after,
1718 static struct pnfs_layout_hdr *
1719 alloc_init_layout_hdr(struct inode *ino,
1720 struct nfs_open_context *ctx,
1723 struct pnfs_layout_hdr *lo;
1725 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1728 refcount_set(&lo->plh_refcount, 1);
1729 INIT_LIST_HEAD(&lo->plh_layouts);
1730 INIT_LIST_HEAD(&lo->plh_segs);
1731 INIT_LIST_HEAD(&lo->plh_return_segs);
1732 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1733 lo->plh_inode = ino;
1734 lo->plh_lc_cred = get_cred(ctx->cred);
1735 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID;
1739 static struct pnfs_layout_hdr *
1740 pnfs_find_alloc_layout(struct inode *ino,
1741 struct nfs_open_context *ctx,
1743 __releases(&ino->i_lock)
1744 __acquires(&ino->i_lock)
1746 struct nfs_inode *nfsi = NFS_I(ino);
1747 struct pnfs_layout_hdr *new = NULL;
1749 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1751 if (nfsi->layout != NULL)
1753 spin_unlock(&ino->i_lock);
1754 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1755 spin_lock(&ino->i_lock);
1757 if (likely(nfsi->layout == NULL)) { /* Won the race? */
1760 } else if (new != NULL)
1761 pnfs_free_layout_hdr(new);
1763 pnfs_get_layout_hdr(nfsi->layout);
1764 return nfsi->layout;
1768 * iomode matching rules:
1769 * iomode lseg strict match
1771 * ----- ----- ------ -----
1776 * READ READ N/A true
1777 * READ RW true false
1778 * READ RW false true
1781 pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1782 const struct pnfs_layout_range *range,
1785 struct pnfs_layout_range range1;
1787 if ((range->iomode == IOMODE_RW &&
1788 ls_range->iomode != IOMODE_RW) ||
1789 (range->iomode != ls_range->iomode &&
1791 !pnfs_lseg_range_intersecting(ls_range, range))
1794 /* range1 covers only the first byte in the range */
1797 return pnfs_lseg_range_contained(ls_range, &range1);
1801 * lookup range in layout
1803 static struct pnfs_layout_segment *
1804 pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1805 struct pnfs_layout_range *range,
1808 struct pnfs_layout_segment *lseg, *ret = NULL;
1810 dprintk("%s:Begin\n", __func__);
1812 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1813 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1814 pnfs_lseg_range_match(&lseg->pls_range, range,
1816 ret = pnfs_get_lseg(lseg);
1821 dprintk("%s:Return lseg %p ref %d\n",
1822 __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0);
1827 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1828 * to the MDS or over pNFS
1830 * The nfs_inode read_io and write_io fields are cumulative counters reset
1831 * when there are no layout segments. Note that in pnfs_update_layout iomode
1832 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1835 * A return of true means use MDS I/O.
1838 * If a file's size is smaller than the file size threshold, data accesses
1839 * SHOULD be sent to the metadata server. If an I/O request has a length that
1840 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1841 * server. If both file size and I/O size are provided, the client SHOULD
1842 * reach or exceed both thresholds before sending its read or write
1843 * requests to the data server.
1845 static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1846 struct inode *ino, int iomode)
1848 struct nfs4_threshold *t = ctx->mdsthreshold;
1849 struct nfs_inode *nfsi = NFS_I(ino);
1850 loff_t fsize = i_size_read(ino);
1851 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1856 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1857 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1861 if (t->bm & THRESHOLD_RD) {
1862 dprintk("%s fsize %llu\n", __func__, fsize);
1864 if (fsize < t->rd_sz)
1867 if (t->bm & THRESHOLD_RD_IO) {
1868 dprintk("%s nfsi->read_io %llu\n", __func__,
1871 if (nfsi->read_io < t->rd_io_sz)
1876 if (t->bm & THRESHOLD_WR) {
1877 dprintk("%s fsize %llu\n", __func__, fsize);
1879 if (fsize < t->wr_sz)
1882 if (t->bm & THRESHOLD_WR_IO) {
1883 dprintk("%s nfsi->write_io %llu\n", __func__,
1886 if (nfsi->write_io < t->wr_io_sz)
1891 if (size_set && io_set) {
1894 } else if (size || io)
1897 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1901 static int pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
1904 * send layoutcommit as it can hold up layoutreturn due to lseg
1907 pnfs_layoutcommit_inode(lo->plh_inode, false);
1908 return wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
1909 nfs_wait_bit_killable,
1913 static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo)
1915 atomic_inc(&lo->plh_outstanding);
1918 static void nfs_layoutget_end(struct pnfs_layout_hdr *lo)
1920 if (atomic_dec_and_test(&lo->plh_outstanding))
1921 wake_up_var(&lo->plh_outstanding);
1924 static bool pnfs_is_first_layoutget(struct pnfs_layout_hdr *lo)
1926 return test_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags);
1929 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1931 unsigned long *bitlock = &lo->plh_flags;
1933 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1934 smp_mb__after_atomic();
1935 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1938 static void _add_to_server_list(struct pnfs_layout_hdr *lo,
1939 struct nfs_server *server)
1941 if (!test_and_set_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) {
1942 struct nfs_client *clp = server->nfs_client;
1944 /* The lo must be on the clp list if there is any
1945 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1947 spin_lock(&clp->cl_lock);
1948 list_add_tail_rcu(&lo->plh_layouts, &server->layouts);
1949 spin_unlock(&clp->cl_lock);
1954 * Layout segment is retreived from the server if not cached.
1955 * The appropriate layout segment is referenced and returned to the caller.
1957 struct pnfs_layout_segment *
1958 pnfs_update_layout(struct inode *ino,
1959 struct nfs_open_context *ctx,
1962 enum pnfs_iomode iomode,
1966 struct pnfs_layout_range arg = {
1972 struct nfs_server *server = NFS_SERVER(ino);
1973 struct nfs_client *clp = server->nfs_client;
1974 struct pnfs_layout_hdr *lo = NULL;
1975 struct pnfs_layout_segment *lseg = NULL;
1976 struct nfs4_layoutget *lgp;
1977 nfs4_stateid stateid;
1979 unsigned long giveup = jiffies + (clp->cl_lease_time << 1);
1982 if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
1983 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1984 PNFS_UPDATE_LAYOUT_NO_PNFS);
1988 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
1989 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1990 PNFS_UPDATE_LAYOUT_MDSTHRESH);
1995 lseg = ERR_PTR(nfs4_client_recover_expired_lease(clp));
1999 spin_lock(&ino->i_lock);
2000 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
2002 spin_unlock(&ino->i_lock);
2003 lseg = ERR_PTR(-ENOMEM);
2004 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2005 PNFS_UPDATE_LAYOUT_NOMEM);
2009 /* Do we even need to bother with this? */
2010 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
2011 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2012 PNFS_UPDATE_LAYOUT_BULK_RECALL);
2013 dprintk("%s matches recall, use MDS\n", __func__);
2017 /* if LAYOUTGET already failed once we don't try again */
2018 if (pnfs_layout_io_test_failed(lo, iomode)) {
2019 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2020 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
2025 * If the layout segment list is empty, but there are outstanding
2026 * layoutget calls, then they might be subject to a layoutrecall.
2028 if ((list_empty(&lo->plh_segs) || !pnfs_layout_is_valid(lo)) &&
2029 atomic_read(&lo->plh_outstanding) != 0) {
2030 spin_unlock(&ino->i_lock);
2031 lseg = ERR_PTR(wait_var_event_killable(&lo->plh_outstanding,
2032 !atomic_read(&lo->plh_outstanding)));
2034 goto out_put_layout_hdr;
2035 pnfs_put_layout_hdr(lo);
2040 * Because we free lsegs when sending LAYOUTRETURN, we need to wait
2043 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
2044 spin_unlock(&ino->i_lock);
2045 dprintk("%s wait for layoutreturn\n", __func__);
2046 lseg = ERR_PTR(pnfs_prepare_to_retry_layoutget(lo));
2047 if (!IS_ERR(lseg)) {
2048 pnfs_put_layout_hdr(lo);
2049 dprintk("%s retrying\n", __func__);
2050 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
2052 PNFS_UPDATE_LAYOUT_RETRY);
2055 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2056 PNFS_UPDATE_LAYOUT_RETURN);
2057 goto out_put_layout_hdr;
2060 lseg = pnfs_find_lseg(lo, &arg, strict_iomode);
2062 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2063 PNFS_UPDATE_LAYOUT_FOUND_CACHED);
2068 * Choose a stateid for the LAYOUTGET. If we don't have a layout
2069 * stateid, or it has been invalidated, then we must use the open
2072 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
2076 * The first layoutget for the file. Need to serialize per
2077 * RFC 5661 Errata 3208.
2079 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
2081 spin_unlock(&ino->i_lock);
2082 lseg = ERR_PTR(wait_on_bit(&lo->plh_flags,
2083 NFS_LAYOUT_FIRST_LAYOUTGET,
2086 goto out_put_layout_hdr;
2087 pnfs_put_layout_hdr(lo);
2088 dprintk("%s retrying\n", __func__);
2092 spin_unlock(&ino->i_lock);
2094 status = nfs4_select_rw_stateid(ctx->state,
2095 iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ,
2096 NULL, &stateid, NULL);
2098 lseg = ERR_PTR(status);
2099 trace_pnfs_update_layout(ino, pos, count,
2101 PNFS_UPDATE_LAYOUT_INVALID_OPEN);
2102 nfs4_schedule_stateid_recovery(server, ctx->state);
2103 pnfs_clear_first_layoutget(lo);
2104 pnfs_put_layout_hdr(lo);
2107 spin_lock(&ino->i_lock);
2109 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
2112 if (pnfs_layoutgets_blocked(lo)) {
2113 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2114 PNFS_UPDATE_LAYOUT_BLOCKED);
2117 nfs_layoutget_begin(lo);
2118 spin_unlock(&ino->i_lock);
2120 _add_to_server_list(lo, server);
2122 pg_offset = arg.offset & ~PAGE_MASK;
2124 arg.offset -= pg_offset;
2125 arg.length += pg_offset;
2127 if (arg.length != NFS4_MAX_UINT64)
2128 arg.length = PAGE_ALIGN(arg.length);
2130 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &stateid, &arg, gfp_flags);
2132 lseg = ERR_PTR(-ENOMEM);
2133 trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL,
2134 PNFS_UPDATE_LAYOUT_NOMEM);
2135 nfs_layoutget_end(lo);
2136 goto out_put_layout_hdr;
2140 pnfs_get_layout_hdr(lo);
2142 lseg = nfs4_proc_layoutget(lgp, &timeout);
2143 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2144 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
2145 nfs_layoutget_end(lo);
2147 switch(PTR_ERR(lseg)) {
2149 if (time_after(jiffies, giveup))
2152 case -ERECALLCONFLICT:
2156 if (!nfs_error_is_fatal(PTR_ERR(lseg))) {
2157 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2160 goto out_put_layout_hdr;
2164 pnfs_clear_first_layoutget(lo);
2165 trace_pnfs_update_layout(ino, pos, count,
2166 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY);
2167 pnfs_put_layout_hdr(lo);
2171 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2176 pnfs_clear_first_layoutget(lo);
2177 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2178 PNFS_UPDATE_LAYOUT_EXIT);
2179 pnfs_put_layout_hdr(lo);
2181 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
2182 "(%s, offset: %llu, length: %llu)\n",
2183 __func__, ino->i_sb->s_id,
2184 (unsigned long long)NFS_FILEID(ino),
2185 IS_ERR_OR_NULL(lseg) ? "not found" : "found",
2186 iomode==IOMODE_RW ? "read/write" : "read-only",
2187 (unsigned long long)pos,
2188 (unsigned long long)count);
2191 spin_unlock(&ino->i_lock);
2192 goto out_put_layout_hdr;
2194 EXPORT_SYMBOL_GPL(pnfs_update_layout);
2197 pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
2199 switch (range->iomode) {
2206 if (range->offset == NFS4_MAX_UINT64)
2208 if (range->length == 0)
2210 if (range->length != NFS4_MAX_UINT64 &&
2211 range->length > NFS4_MAX_UINT64 - range->offset)
2216 static struct pnfs_layout_hdr *
2217 _pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx)
2219 struct pnfs_layout_hdr *lo;
2221 spin_lock(&ino->i_lock);
2222 lo = pnfs_find_alloc_layout(ino, ctx, nfs_io_gfp_mask());
2225 if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags))
2227 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
2229 if (pnfs_layoutgets_blocked(lo))
2231 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags))
2233 nfs_layoutget_begin(lo);
2234 spin_unlock(&ino->i_lock);
2235 _add_to_server_list(lo, NFS_SERVER(ino));
2239 spin_unlock(&ino->i_lock);
2240 pnfs_put_layout_hdr(lo);
2244 static void _lgopen_prepare_attached(struct nfs4_opendata *data,
2245 struct nfs_open_context *ctx)
2247 struct inode *ino = data->dentry->d_inode;
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;
2255 struct pnfs_layout_hdr *lo;
2257 /* Heuristic: don't send layoutget if we have cached data */
2258 if (rng.iomode == IOMODE_READ &&
2259 (i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0))
2262 lo = _pnfs_grab_empty_layout(ino, ctx);
2265 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid, &rng,
2268 pnfs_clear_first_layoutget(lo);
2269 nfs_layoutget_end(lo);
2270 pnfs_put_layout_hdr(lo);
2275 data->o_arg.lg_args = &lgp->args;
2276 data->o_res.lg_res = &lgp->res;
2279 static void _lgopen_prepare_floating(struct nfs4_opendata *data,
2280 struct nfs_open_context *ctx)
2282 struct inode *ino = data->dentry->d_inode;
2283 struct pnfs_layout_range rng = {
2284 .iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2285 IOMODE_RW: IOMODE_READ,
2287 .length = NFS4_MAX_UINT64,
2289 struct nfs4_layoutget *lgp;
2291 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid, &rng,
2296 data->o_arg.lg_args = &lgp->args;
2297 data->o_res.lg_res = &lgp->res;
2300 void pnfs_lgopen_prepare(struct nfs4_opendata *data,
2301 struct nfs_open_context *ctx)
2303 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
2305 if (!(pnfs_enabled_sb(server) &&
2306 server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN))
2308 /* Could check on max_ops, but currently hardcoded high enough */
2309 if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN))
2314 _lgopen_prepare_attached(data, ctx);
2316 _lgopen_prepare_floating(data, ctx);
2319 void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
2320 struct nfs_open_context *ctx)
2322 struct pnfs_layout_hdr *lo;
2323 struct pnfs_layout_segment *lseg;
2324 struct nfs_server *srv = NFS_SERVER(ino);
2329 dprintk("%s: entered with status %i\n", __func__, lgp->res.status);
2330 if (lgp->res.status) {
2331 switch (lgp->res.status) {
2335 * Halt lgopen attempts if the server doesn't recognise
2336 * the "current stateid" value, the layout type, or the
2337 * layoutget operation as being valid.
2338 * Also if it complains about too many ops in the compound
2339 * or of the request/reply being too big.
2341 case -NFS4ERR_BAD_STATEID:
2342 case -NFS4ERR_NOTSUPP:
2343 case -NFS4ERR_REP_TOO_BIG:
2344 case -NFS4ERR_REP_TOO_BIG_TO_CACHE:
2345 case -NFS4ERR_REQ_TOO_BIG:
2346 case -NFS4ERR_TOO_MANY_OPS:
2347 case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
2348 srv->caps &= ~NFS_CAP_LGOPEN;
2353 lo = _pnfs_grab_empty_layout(ino, ctx);
2360 lseg = pnfs_layout_process(lgp);
2361 if (!IS_ERR(lseg)) {
2362 iomode = lgp->args.range.iomode;
2363 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2364 pnfs_put_lseg(lseg);
2368 void nfs4_lgopen_release(struct nfs4_layoutget *lgp)
2372 pnfs_clear_first_layoutget(lgp->lo);
2373 nfs_layoutget_end(lgp->lo);
2375 pnfs_layoutget_free(lgp);
2379 struct pnfs_layout_segment *
2380 pnfs_layout_process(struct nfs4_layoutget *lgp)
2382 struct pnfs_layout_hdr *lo = lgp->lo;
2383 struct nfs4_layoutget_res *res = &lgp->res;
2384 struct pnfs_layout_segment *lseg;
2385 struct inode *ino = lo->plh_inode;
2388 if (!pnfs_sanity_check_layout_range(&res->range))
2389 return ERR_PTR(-EINVAL);
2391 /* Inject layout blob into I/O device driver */
2392 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
2393 if (IS_ERR_OR_NULL(lseg)) {
2395 lseg = ERR_PTR(-ENOMEM);
2397 dprintk("%s: Could not allocate layout: error %ld\n",
2398 __func__, PTR_ERR(lseg));
2402 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid);
2404 spin_lock(&ino->i_lock);
2405 if (pnfs_layoutgets_blocked(lo)) {
2406 dprintk("%s forget reply due to state\n", __func__);
2410 if (!pnfs_layout_is_valid(lo) && !pnfs_is_first_layoutget(lo))
2413 if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
2414 /* existing state ID, make sure the sequence number matches. */
2415 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
2416 if (!pnfs_layout_is_valid(lo))
2417 lo->plh_barrier = 0;
2418 dprintk("%s forget reply due to sequence\n", __func__);
2421 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, false);
2422 } else if (pnfs_layout_is_valid(lo)) {
2424 * We got an entirely new state ID. Mark all segments for the
2425 * inode invalid, and retry the layoutget
2427 struct pnfs_layout_range range = {
2428 .iomode = IOMODE_ANY,
2429 .length = NFS4_MAX_UINT64,
2431 pnfs_mark_matching_lsegs_return(lo, &free_me, &range, 0);
2434 /* We have a completely new layout */
2435 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, true);
2438 pnfs_get_lseg(lseg);
2439 pnfs_layout_insert_lseg(lo, lseg, &free_me);
2442 if (res->return_on_close)
2443 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
2445 spin_unlock(&ino->i_lock);
2446 pnfs_free_lseg_list(&free_me);
2450 spin_unlock(&ino->i_lock);
2451 lseg->pls_layout = lo;
2452 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
2453 return ERR_PTR(-EAGAIN);
2457 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
2458 * @lo: pointer to layout header
2459 * @tmp_list: list header to be used with pnfs_free_lseg_list()
2460 * @return_range: describe layout segment ranges to be returned
2461 * @seq: stateid seqid to match
2463 * This function is mainly intended for use by layoutrecall. It attempts
2464 * to free the layout segment immediately, or else to mark it for return
2465 * as soon as its reference count drops to zero.
2468 * - 0: a layoutreturn needs to be scheduled.
2469 * - EBUSY: there are layout segment that are still in use.
2470 * - ENOENT: there are no layout segments that need to be returned.
2473 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
2474 struct list_head *tmp_list,
2475 const struct pnfs_layout_range *return_range,
2478 struct pnfs_layout_segment *lseg, *next;
2481 dprintk("%s:Begin lo %p\n", __func__, lo);
2483 assert_spin_locked(&lo->plh_inode->i_lock);
2485 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
2486 tmp_list = &lo->plh_return_segs;
2488 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
2489 if (pnfs_match_lseg_recall(lseg, return_range, seq)) {
2490 dprintk("%s: marking lseg %p iomode %d "
2491 "offset %llu length %llu\n", __func__,
2492 lseg, lseg->pls_range.iomode,
2493 lseg->pls_range.offset,
2494 lseg->pls_range.length);
2495 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
2496 tmp_list = &lo->plh_return_segs;
2497 if (mark_lseg_invalid(lseg, tmp_list))
2500 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
2504 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2508 if (!list_empty(&lo->plh_return_segs)) {
2509 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2517 pnfs_mark_layout_for_return(struct inode *inode,
2518 const struct pnfs_layout_range *range)
2520 struct pnfs_layout_hdr *lo;
2521 bool return_now = false;
2523 spin_lock(&inode->i_lock);
2524 lo = NFS_I(inode)->layout;
2525 if (!pnfs_layout_is_valid(lo)) {
2526 spin_unlock(&inode->i_lock);
2529 pnfs_set_plh_return_info(lo, range->iomode, 0);
2531 * mark all matching lsegs so that we are sure to have no live
2532 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
2535 if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, range, 0) != -EBUSY) {
2536 const struct cred *cred;
2537 nfs4_stateid stateid;
2538 enum pnfs_iomode iomode;
2540 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode);
2541 spin_unlock(&inode->i_lock);
2543 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false);
2545 spin_unlock(&inode->i_lock);
2546 nfs_commit_inode(inode, 0);
2550 void pnfs_error_mark_layout_for_return(struct inode *inode,
2551 struct pnfs_layout_segment *lseg)
2553 struct pnfs_layout_range range = {
2554 .iomode = lseg->pls_range.iomode,
2556 .length = NFS4_MAX_UINT64,
2559 pnfs_mark_layout_for_return(inode, &range);
2561 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
2564 pnfs_layout_can_be_returned(struct pnfs_layout_hdr *lo)
2566 return pnfs_layout_is_valid(lo) &&
2567 !test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) &&
2568 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
2571 static struct pnfs_layout_segment *
2572 pnfs_find_first_lseg(struct pnfs_layout_hdr *lo,
2573 const struct pnfs_layout_range *range,
2574 enum pnfs_iomode iomode)
2576 struct pnfs_layout_segment *lseg;
2578 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
2579 if (!test_bit(NFS_LSEG_VALID, &lseg->pls_flags))
2581 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
2583 if (lseg->pls_range.iomode != iomode && iomode != IOMODE_ANY)
2585 if (pnfs_lseg_range_intersecting(&lseg->pls_range, range))
2591 /* Find open file states whose mode matches that of the range */
2593 pnfs_should_return_unused_layout(struct pnfs_layout_hdr *lo,
2594 const struct pnfs_layout_range *range)
2596 struct list_head *head;
2597 struct nfs_open_context *ctx;
2600 if (!pnfs_layout_can_be_returned(lo) ||
2601 !pnfs_find_first_lseg(lo, range, range->iomode))
2604 head = &NFS_I(lo->plh_inode)->open_files;
2605 list_for_each_entry_rcu(ctx, head, list) {
2607 mode |= ctx->state->state & (FMODE_READ|FMODE_WRITE);
2610 switch (range->iomode) {
2614 mode &= ~FMODE_WRITE;
2617 if (pnfs_find_first_lseg(lo, range, IOMODE_READ))
2618 mode &= ~FMODE_READ;
2624 pnfs_layout_return_unused_byserver(struct nfs_server *server, void *data)
2626 const struct pnfs_layout_range *range = data;
2627 struct pnfs_layout_hdr *lo;
2628 struct inode *inode;
2631 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) {
2632 if (!pnfs_layout_can_be_returned(lo) ||
2633 test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
2635 inode = lo->plh_inode;
2636 spin_lock(&inode->i_lock);
2637 if (!pnfs_should_return_unused_layout(lo, range)) {
2638 spin_unlock(&inode->i_lock);
2641 spin_unlock(&inode->i_lock);
2642 inode = pnfs_grab_inode_layout_hdr(lo);
2646 pnfs_mark_layout_for_return(inode, range);
2656 pnfs_layout_return_unused_byclid(struct nfs_client *clp,
2657 enum pnfs_iomode iomode)
2659 struct pnfs_layout_range range = {
2662 .length = NFS4_MAX_UINT64,
2665 nfs_client_for_each_server(clp, pnfs_layout_return_unused_byserver,
2670 pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio)
2672 if (pgio->pg_lseg == NULL ||
2673 test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags))
2675 pnfs_put_lseg(pgio->pg_lseg);
2676 pgio->pg_lseg = NULL;
2678 EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout);
2681 * Check for any intersection between the request and the pgio->pg_lseg,
2682 * and if none, put this pgio->pg_lseg away.
2685 pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2687 if (pgio->pg_lseg && !pnfs_lseg_request_intersecting(pgio->pg_lseg, req)) {
2688 pnfs_put_lseg(pgio->pg_lseg);
2689 pgio->pg_lseg = NULL;
2692 EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_range);
2695 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2699 pnfs_generic_pg_check_layout(pgio);
2700 pnfs_generic_pg_check_range(pgio, req);
2701 if (pgio->pg_lseg == NULL) {
2702 if (pgio->pg_dreq == NULL)
2703 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
2705 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
2708 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
2709 req_offset(req), rd_size,
2712 if (IS_ERR(pgio->pg_lseg)) {
2713 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2714 pgio->pg_lseg = NULL;
2718 /* If no lseg, fall back to read through mds */
2719 if (pgio->pg_lseg == NULL)
2720 nfs_pageio_reset_read_mds(pgio);
2723 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
2726 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
2727 struct nfs_page *req, u64 wb_size)
2729 pnfs_generic_pg_check_layout(pgio);
2730 pnfs_generic_pg_check_range(pgio, req);
2731 if (pgio->pg_lseg == NULL) {
2733 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
2734 req_offset(req), wb_size, IOMODE_RW,
2735 false, nfs_io_gfp_mask());
2736 if (IS_ERR(pgio->pg_lseg)) {
2737 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2738 pgio->pg_lseg = NULL;
2742 /* If no lseg, fall back to write through mds */
2743 if (pgio->pg_lseg == NULL)
2744 nfs_pageio_reset_write_mds(pgio);
2746 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
2749 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
2751 if (desc->pg_lseg) {
2752 pnfs_put_lseg(desc->pg_lseg);
2753 desc->pg_lseg = NULL;
2756 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
2759 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
2760 * of bytes (maximum @req->wb_bytes) that can be coalesced.
2763 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
2764 struct nfs_page *prev, struct nfs_page *req)
2767 u64 seg_end, req_start, seg_left;
2769 size = nfs_generic_pg_test(pgio, prev, req);
2774 * 'size' contains the number of bytes left in the current page (up
2775 * to the original size asked for in @req->wb_bytes).
2777 * Calculate how many bytes are left in the layout segment
2778 * and if there are less bytes than 'size', return that instead.
2780 * Please also note that 'end_offset' is actually the offset of the
2781 * first byte that lies outside the pnfs_layout_range. FIXME?
2784 if (pgio->pg_lseg) {
2785 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset,
2786 pgio->pg_lseg->pls_range.length);
2787 req_start = req_offset(req);
2789 /* start of request is past the last byte of this segment */
2790 if (req_start >= seg_end)
2793 /* adjust 'size' iff there are fewer bytes left in the
2794 * segment than what nfs_generic_pg_test returned */
2795 seg_left = seg_end - req_start;
2796 if (seg_left < size)
2797 size = (unsigned int)seg_left;
2802 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
2804 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
2806 struct nfs_pageio_descriptor pgio;
2808 /* Resend all requests through the MDS */
2809 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
2810 hdr->completion_ops);
2811 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
2812 return nfs_pageio_resend(&pgio, hdr);
2814 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
2816 static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
2819 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
2820 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2821 PNFS_LAYOUTRET_ON_ERROR) {
2822 pnfs_return_layout(hdr->inode);
2824 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2825 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
2829 * Called by non rpc-based layout drivers
2831 void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
2833 if (likely(!hdr->pnfs_error)) {
2834 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
2835 hdr->mds_offset + hdr->res.count);
2836 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2838 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
2839 if (unlikely(hdr->pnfs_error))
2840 pnfs_ld_handle_write_error(hdr);
2841 hdr->mds_ops->rpc_release(hdr);
2843 EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
2846 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
2847 struct nfs_pgio_header *hdr)
2849 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2851 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2852 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2853 nfs_pageio_reset_write_mds(desc);
2854 mirror->pg_recoalesce = 1;
2856 hdr->completion_ops->completion(hdr);
2859 static enum pnfs_try_status
2860 pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
2861 const struct rpc_call_ops *call_ops,
2862 struct pnfs_layout_segment *lseg,
2865 struct inode *inode = hdr->inode;
2866 enum pnfs_try_status trypnfs;
2867 struct nfs_server *nfss = NFS_SERVER(inode);
2869 hdr->mds_ops = call_ops;
2871 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
2872 inode->i_ino, hdr->args.count, hdr->args.offset, how);
2873 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
2874 if (trypnfs != PNFS_NOT_ATTEMPTED)
2875 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
2876 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2881 pnfs_do_write(struct nfs_pageio_descriptor *desc,
2882 struct nfs_pgio_header *hdr, int how)
2884 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2885 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2886 enum pnfs_try_status trypnfs;
2888 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
2890 case PNFS_NOT_ATTEMPTED:
2891 pnfs_write_through_mds(desc, hdr);
2893 case PNFS_ATTEMPTED:
2895 case PNFS_TRY_AGAIN:
2896 /* cleanup hdr and prepare to redo pnfs */
2897 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2898 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2899 list_splice_init(&hdr->pages, &mirror->pg_list);
2900 mirror->pg_recoalesce = 1;
2902 hdr->mds_ops->rpc_release(hdr);
2906 static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
2908 pnfs_put_lseg(hdr->lseg);
2909 nfs_pgio_header_free(hdr);
2913 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
2915 struct nfs_pgio_header *hdr;
2918 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2920 desc->pg_error = -ENOMEM;
2921 return desc->pg_error;
2923 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
2925 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2926 ret = nfs_generic_pgio(desc, hdr);
2928 pnfs_do_write(desc, hdr, desc->pg_ioflags);
2932 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
2934 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
2936 struct nfs_pageio_descriptor pgio;
2938 /* Resend all requests through the MDS */
2939 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
2940 return nfs_pageio_resend(&pgio, hdr);
2942 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
2944 static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
2946 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
2947 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2948 PNFS_LAYOUTRET_ON_ERROR) {
2949 pnfs_return_layout(hdr->inode);
2951 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2952 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2956 * Called by non rpc-based layout drivers
2958 void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2960 if (likely(!hdr->pnfs_error))
2961 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2962 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2963 if (unlikely(hdr->pnfs_error))
2964 pnfs_ld_handle_read_error(hdr);
2965 hdr->mds_ops->rpc_release(hdr);
2967 EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
2970 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2971 struct nfs_pgio_header *hdr)
2973 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2975 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2976 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2977 nfs_pageio_reset_read_mds(desc);
2978 mirror->pg_recoalesce = 1;
2980 hdr->completion_ops->completion(hdr);
2984 * Call the appropriate parallel I/O subsystem read function.
2986 static enum pnfs_try_status
2987 pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2988 const struct rpc_call_ops *call_ops,
2989 struct pnfs_layout_segment *lseg)
2991 struct inode *inode = hdr->inode;
2992 struct nfs_server *nfss = NFS_SERVER(inode);
2993 enum pnfs_try_status trypnfs;
2995 hdr->mds_ops = call_ops;
2997 dprintk("%s: Reading ino:%lu %u@%llu\n",
2998 __func__, inode->i_ino, hdr->args.count, hdr->args.offset);
3000 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
3001 if (trypnfs != PNFS_NOT_ATTEMPTED)
3002 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
3003 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
3007 /* Resend all requests through pnfs. */
3008 void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr,
3009 unsigned int mirror_idx)
3011 struct nfs_pageio_descriptor pgio;
3013 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
3014 /* Prevent deadlocks with layoutreturn! */
3015 pnfs_put_lseg(hdr->lseg);
3018 nfs_pageio_init_read(&pgio, hdr->inode, false,
3019 hdr->completion_ops);
3020 pgio.pg_mirror_idx = mirror_idx;
3021 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
3024 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
3027 pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
3029 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
3030 struct pnfs_layout_segment *lseg = desc->pg_lseg;
3031 enum pnfs_try_status trypnfs;
3033 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
3035 case PNFS_NOT_ATTEMPTED:
3036 pnfs_read_through_mds(desc, hdr);
3038 case PNFS_ATTEMPTED:
3040 case PNFS_TRY_AGAIN:
3041 /* cleanup hdr and prepare to redo pnfs */
3042 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
3043 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
3044 list_splice_init(&hdr->pages, &mirror->pg_list);
3045 mirror->pg_recoalesce = 1;
3047 hdr->mds_ops->rpc_release(hdr);
3051 static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
3053 pnfs_put_lseg(hdr->lseg);
3054 nfs_pgio_header_free(hdr);
3058 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
3060 struct nfs_pgio_header *hdr;
3063 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
3065 desc->pg_error = -ENOMEM;
3066 return desc->pg_error;
3068 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
3069 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
3070 ret = nfs_generic_pgio(desc, hdr);
3072 pnfs_do_read(desc, hdr);
3075 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
3077 static void pnfs_clear_layoutcommitting(struct inode *inode)
3079 unsigned long *bitlock = &NFS_I(inode)->flags;
3081 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
3082 smp_mb__after_atomic();
3083 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
3087 * There can be multiple RW segments.
3089 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
3091 struct pnfs_layout_segment *lseg;
3093 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
3094 if (lseg->pls_range.iomode == IOMODE_RW &&
3095 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
3096 list_add(&lseg->pls_lc_list, listp);
3100 static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
3102 struct pnfs_layout_segment *lseg, *tmp;
3104 /* Matched by references in pnfs_set_layoutcommit */
3105 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
3106 list_del_init(&lseg->pls_lc_list);
3107 pnfs_put_lseg(lseg);
3110 pnfs_clear_layoutcommitting(inode);
3113 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
3115 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
3117 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
3120 pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
3123 struct nfs_inode *nfsi = NFS_I(inode);
3124 bool mark_as_dirty = false;
3126 spin_lock(&inode->i_lock);
3127 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
3128 nfsi->layout->plh_lwb = end_pos;
3129 mark_as_dirty = true;
3130 dprintk("%s: Set layoutcommit for inode %lu ",
3131 __func__, inode->i_ino);
3132 } else if (end_pos > nfsi->layout->plh_lwb)
3133 nfsi->layout->plh_lwb = end_pos;
3134 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
3135 /* references matched in nfs4_layoutcommit_release */
3136 pnfs_get_lseg(lseg);
3138 spin_unlock(&inode->i_lock);
3139 dprintk("%s: lseg %p end_pos %llu\n",
3140 __func__, lseg, nfsi->layout->plh_lwb);
3142 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
3143 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
3145 mark_inode_dirty_sync(inode);
3147 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
3149 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
3151 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
3153 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
3154 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
3155 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
3159 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
3160 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
3161 * data to disk to allow the server to recover the data if it crashes.
3162 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
3163 * is off, and a COMMIT is sent to a data server, or
3164 * if WRITEs to a data server return NFS_DATA_SYNC.
3167 pnfs_layoutcommit_inode(struct inode *inode, bool sync)
3169 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
3170 struct nfs4_layoutcommit_data *data;
3171 struct nfs_inode *nfsi = NFS_I(inode);
3175 if (!pnfs_layoutcommit_outstanding(inode))
3178 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
3181 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
3184 status = wait_on_bit_lock_action(&nfsi->flags,
3185 NFS_INO_LAYOUTCOMMITTING,
3186 nfs_wait_bit_killable,
3193 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
3194 data = kzalloc(sizeof(*data), nfs_io_gfp_mask());
3196 goto clear_layoutcommitting;
3199 spin_lock(&inode->i_lock);
3200 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
3203 INIT_LIST_HEAD(&data->lseg_list);
3204 pnfs_list_write_lseg(inode, &data->lseg_list);
3206 end_pos = nfsi->layout->plh_lwb;
3208 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
3209 data->cred = get_cred(nfsi->layout->plh_lc_cred);
3210 spin_unlock(&inode->i_lock);
3212 data->args.inode = inode;
3213 nfs_fattr_init(&data->fattr);
3214 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
3215 data->res.fattr = &data->fattr;
3217 data->args.lastbytewritten = end_pos - 1;
3219 data->args.lastbytewritten = U64_MAX;
3220 data->res.server = NFS_SERVER(inode);
3222 if (ld->prepare_layoutcommit) {
3223 status = ld->prepare_layoutcommit(&data->args);
3225 put_cred(data->cred);
3226 spin_lock(&inode->i_lock);
3227 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
3228 if (end_pos > nfsi->layout->plh_lwb)
3229 nfsi->layout->plh_lwb = end_pos;
3235 status = nfs4_proc_layoutcommit(data, sync);
3238 mark_inode_dirty_sync(inode);
3239 dprintk("<-- %s status %d\n", __func__, status);
3242 spin_unlock(&inode->i_lock);
3244 clear_layoutcommitting:
3245 pnfs_clear_layoutcommitting(inode);
3248 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
3251 pnfs_generic_sync(struct inode *inode, bool datasync)
3253 return pnfs_layoutcommit_inode(inode, true);
3255 EXPORT_SYMBOL_GPL(pnfs_generic_sync);
3257 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
3259 struct nfs4_threshold *thp;
3261 thp = kzalloc(sizeof(*thp), nfs_io_gfp_mask());
3263 dprintk("%s mdsthreshold allocation failed\n", __func__);
3269 #if IS_ENABLED(CONFIG_NFS_V4_2)
3271 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
3273 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
3274 struct nfs_server *server = NFS_SERVER(inode);
3275 struct nfs_inode *nfsi = NFS_I(inode);
3276 struct nfs42_layoutstat_data *data;
3277 struct pnfs_layout_hdr *hdr;
3280 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
3283 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
3286 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
3289 spin_lock(&inode->i_lock);
3290 if (!NFS_I(inode)->layout) {
3291 spin_unlock(&inode->i_lock);
3292 goto out_clear_layoutstats;
3294 hdr = NFS_I(inode)->layout;
3295 pnfs_get_layout_hdr(hdr);
3296 spin_unlock(&inode->i_lock);
3298 data = kzalloc(sizeof(*data), gfp_flags);
3304 data->args.fh = NFS_FH(inode);
3305 data->args.inode = inode;
3306 status = ld->prepare_layoutstats(&data->args);
3310 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
3313 dprintk("%s returns %d\n", __func__, status);
3319 pnfs_put_layout_hdr(hdr);
3320 out_clear_layoutstats:
3321 smp_mb__before_atomic();
3322 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
3323 smp_mb__after_atomic();
3326 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
3329 unsigned int layoutstats_timer;
3330 module_param(layoutstats_timer, uint, 0644);
3331 EXPORT_SYMBOL_GPL(layoutstats_timer);