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 (!list_empty(&lo->plh_layouts)) {
272 struct nfs_client *clp = server->nfs_client;
274 spin_lock(&clp->cl_lock);
275 list_del_init(&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);
313 pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
316 if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode)
318 lo->plh_return_iomode = iomode;
319 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
321 WARN_ON_ONCE(lo->plh_return_seq != 0 && lo->plh_return_seq != seq);
322 lo->plh_return_seq = seq;
327 pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo)
329 struct pnfs_layout_segment *lseg;
330 lo->plh_return_iomode = 0;
331 lo->plh_return_seq = 0;
332 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
333 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
334 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
336 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
340 static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
342 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
343 clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags);
344 smp_mb__after_atomic();
345 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
346 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
350 pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg,
351 struct list_head *free_me)
353 clear_bit(NFS_LSEG_ROC, &lseg->pls_flags);
354 clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
355 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags))
356 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
357 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
358 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
362 * Update the seqid of a layout stateid
364 bool nfs4_layoutreturn_refresh_stateid(nfs4_stateid *dst,
365 struct pnfs_layout_range *dst_range,
368 struct pnfs_layout_hdr *lo;
369 struct pnfs_layout_range range = {
370 .iomode = IOMODE_ANY,
372 .length = NFS4_MAX_UINT64,
378 spin_lock(&inode->i_lock);
379 lo = NFS_I(inode)->layout;
380 if (lo && nfs4_stateid_match_other(dst, &lo->plh_stateid)) {
381 err = pnfs_mark_matching_lsegs_return(lo, &head, &range, 0);
383 dst->seqid = lo->plh_stateid.seqid;
388 spin_unlock(&inode->i_lock);
389 pnfs_free_lseg_list(&head);
394 * Mark a pnfs_layout_hdr and all associated layout segments as invalid
396 * In order to continue using the pnfs_layout_hdr, a full recovery
398 * Note that caller must hold inode->i_lock.
401 pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
402 struct list_head *lseg_list)
404 struct pnfs_layout_range range = {
405 .iomode = IOMODE_ANY,
407 .length = NFS4_MAX_UINT64,
409 struct pnfs_layout_segment *lseg, *next;
411 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
412 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
413 pnfs_clear_lseg_state(lseg, lseg_list);
414 pnfs_clear_layoutreturn_info(lo);
415 pnfs_free_returned_lsegs(lo, lseg_list, &range, 0);
416 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) &&
417 !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
418 pnfs_clear_layoutreturn_waitbit(lo);
419 return !list_empty(&lo->plh_segs);
423 pnfs_iomode_to_fail_bit(u32 iomode)
425 return iomode == IOMODE_RW ?
426 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
430 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
432 lo->plh_retry_timestamp = jiffies;
433 if (!test_and_set_bit(fail_bit, &lo->plh_flags))
434 refcount_inc(&lo->plh_refcount);
438 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
440 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
441 refcount_dec(&lo->plh_refcount);
445 pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
447 struct inode *inode = lo->plh_inode;
448 struct pnfs_layout_range range = {
451 .length = NFS4_MAX_UINT64,
455 spin_lock(&inode->i_lock);
456 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
457 pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0);
458 spin_unlock(&inode->i_lock);
459 pnfs_free_lseg_list(&head);
460 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
461 iomode == IOMODE_RW ? "RW" : "READ");
465 pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
467 unsigned long start, end;
468 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
470 if (test_bit(fail_bit, &lo->plh_flags) == 0)
473 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
474 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
475 /* It is time to retry the failed layoutgets */
476 pnfs_layout_clear_fail_bit(lo, fail_bit);
483 pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg,
484 const struct pnfs_layout_range *range,
485 const nfs4_stateid *stateid)
487 INIT_LIST_HEAD(&lseg->pls_list);
488 INIT_LIST_HEAD(&lseg->pls_lc_list);
489 refcount_set(&lseg->pls_refcount, 1);
490 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
491 lseg->pls_layout = lo;
492 lseg->pls_range = *range;
493 lseg->pls_seq = be32_to_cpu(stateid->seqid);
496 static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
499 struct inode *inode = lseg->pls_layout->plh_inode;
500 NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg);
505 pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
506 struct pnfs_layout_segment *lseg)
508 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
509 list_del_init(&lseg->pls_list);
510 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
511 refcount_dec(&lo->plh_refcount);
512 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
514 if (list_empty(&lo->plh_segs) &&
515 !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
516 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
517 if (atomic_read(&lo->plh_outstanding) == 0)
518 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
519 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
524 pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo,
525 struct pnfs_layout_segment *lseg)
527 if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
528 pnfs_layout_is_valid(lo)) {
529 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
530 list_move_tail(&lseg->pls_list, &lo->plh_return_segs);
537 pnfs_put_lseg(struct pnfs_layout_segment *lseg)
539 struct pnfs_layout_hdr *lo;
545 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
546 refcount_read(&lseg->pls_refcount),
547 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
549 lo = lseg->pls_layout;
550 inode = lo->plh_inode;
552 if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
553 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
554 spin_unlock(&inode->i_lock);
557 pnfs_get_layout_hdr(lo);
558 pnfs_layout_remove_lseg(lo, lseg);
559 if (pnfs_cache_lseg_for_layoutreturn(lo, lseg))
561 spin_unlock(&inode->i_lock);
562 pnfs_free_lseg(lseg);
563 pnfs_put_layout_hdr(lo);
566 EXPORT_SYMBOL_GPL(pnfs_put_lseg);
569 * is l2 fully contained in l1?
571 * [----------------------------------)
576 pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
577 const struct pnfs_layout_range *l2)
579 u64 start1 = l1->offset;
580 u64 end1 = pnfs_end_offset(start1, l1->length);
581 u64 start2 = l2->offset;
582 u64 end2 = pnfs_end_offset(start2, l2->length);
584 return (start1 <= start2) && (end1 >= end2);
587 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
588 struct list_head *tmp_list)
590 if (!refcount_dec_and_test(&lseg->pls_refcount))
592 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
593 list_add(&lseg->pls_list, tmp_list);
597 /* Returns 1 if lseg is removed from list, 0 otherwise */
598 static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
599 struct list_head *tmp_list)
603 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
604 /* Remove the reference keeping the lseg in the
605 * list. It will now be removed when all
606 * outstanding io is finished.
608 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
609 refcount_read(&lseg->pls_refcount));
610 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
617 * Compare 2 layout stateid sequence ids, to see which is newer,
618 * taking into account wraparound issues.
620 static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
622 return (s32)(s1 - s2) > 0;
626 pnfs_should_free_range(const struct pnfs_layout_range *lseg_range,
627 const struct pnfs_layout_range *recall_range)
629 return (recall_range->iomode == IOMODE_ANY ||
630 lseg_range->iomode == recall_range->iomode) &&
631 pnfs_lseg_range_intersecting(lseg_range, recall_range);
635 pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg,
636 const struct pnfs_layout_range *recall_range,
639 if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq))
641 if (recall_range == NULL)
643 return pnfs_should_free_range(&lseg->pls_range, recall_range);
647 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later
648 * @lo: layout header containing the lsegs
649 * @tmp_list: list head where doomed lsegs should go
650 * @recall_range: optional recall range argument to match (may be NULL)
651 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0)
653 * Walk the list of lsegs in the layout header, and tear down any that should
654 * be destroyed. If "recall_range" is specified then the segment must match
655 * that range. If "seq" is non-zero, then only match segments that were handed
656 * out at or before that sequence.
658 * Returns number of matching invalid lsegs remaining in list after scanning
659 * it and purging them.
662 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
663 struct list_head *tmp_list,
664 const struct pnfs_layout_range *recall_range,
667 struct pnfs_layout_segment *lseg, *next;
670 dprintk("%s:Begin lo %p\n", __func__, lo);
672 if (list_empty(&lo->plh_segs))
674 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
675 if (pnfs_match_lseg_recall(lseg, recall_range, seq)) {
676 dprintk("%s: freeing lseg %p iomode %d seq %u "
677 "offset %llu length %llu\n", __func__,
678 lseg, lseg->pls_range.iomode, lseg->pls_seq,
679 lseg->pls_range.offset, lseg->pls_range.length);
680 if (!mark_lseg_invalid(lseg, tmp_list))
683 dprintk("%s:Return %i\n", __func__, remaining);
688 pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
689 struct list_head *free_me,
690 const struct pnfs_layout_range *range,
693 struct pnfs_layout_segment *lseg, *next;
695 list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) {
696 if (pnfs_match_lseg_recall(lseg, range, seq))
697 list_move_tail(&lseg->pls_list, free_me);
701 /* note free_me must contain lsegs from a single layout_hdr */
703 pnfs_free_lseg_list(struct list_head *free_me)
705 struct pnfs_layout_segment *lseg, *tmp;
707 if (list_empty(free_me))
710 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
711 list_del(&lseg->pls_list);
712 pnfs_free_lseg(lseg);
717 pnfs_destroy_layout(struct nfs_inode *nfsi)
719 struct pnfs_layout_hdr *lo;
722 spin_lock(&nfsi->vfs_inode.i_lock);
725 pnfs_get_layout_hdr(lo);
726 pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
727 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
728 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
729 spin_unlock(&nfsi->vfs_inode.i_lock);
730 pnfs_free_lseg_list(&tmp_list);
731 nfs_commit_inode(&nfsi->vfs_inode, 0);
732 pnfs_put_layout_hdr(lo);
734 spin_unlock(&nfsi->vfs_inode.i_lock);
736 EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
739 pnfs_layout_add_bulk_destroy_list(struct inode *inode,
740 struct list_head *layout_list)
742 struct pnfs_layout_hdr *lo;
745 spin_lock(&inode->i_lock);
746 lo = NFS_I(inode)->layout;
747 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
748 pnfs_get_layout_hdr(lo);
749 list_add(&lo->plh_bulk_destroy, layout_list);
752 spin_unlock(&inode->i_lock);
756 /* Caller must hold rcu_read_lock and clp->cl_lock */
758 pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
759 struct nfs_server *server,
760 struct list_head *layout_list)
761 __must_hold(&clp->cl_lock)
764 struct pnfs_layout_hdr *lo, *next;
767 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
768 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
769 test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) ||
770 !list_empty(&lo->plh_bulk_destroy))
772 /* If the sb is being destroyed, just bail */
773 if (!nfs_sb_active(server->super))
775 inode = igrab(lo->plh_inode);
777 list_del_init(&lo->plh_layouts);
778 if (pnfs_layout_add_bulk_destroy_list(inode,
782 spin_unlock(&clp->cl_lock);
786 spin_unlock(&clp->cl_lock);
787 set_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags);
789 nfs_sb_deactive(server->super);
790 spin_lock(&clp->cl_lock);
798 pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
801 struct pnfs_layout_hdr *lo;
803 LIST_HEAD(lseg_list);
806 while (!list_empty(layout_list)) {
807 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
809 dprintk("%s freeing layout for inode %lu\n", __func__,
810 lo->plh_inode->i_ino);
811 inode = lo->plh_inode;
813 pnfs_layoutcommit_inode(inode, false);
815 spin_lock(&inode->i_lock);
816 list_del_init(&lo->plh_bulk_destroy);
817 if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
819 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
822 spin_unlock(&inode->i_lock);
823 pnfs_free_lseg_list(&lseg_list);
824 /* Free all lsegs that are attached to commit buckets */
825 nfs_commit_inode(inode, 0);
826 pnfs_put_layout_hdr(lo);
827 nfs_iput_and_deactive(inode);
833 pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
834 struct nfs_fsid *fsid,
837 struct nfs_server *server;
838 LIST_HEAD(layout_list);
840 spin_lock(&clp->cl_lock);
843 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
844 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
846 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
852 spin_unlock(&clp->cl_lock);
854 if (list_empty(&layout_list))
856 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
860 pnfs_destroy_layouts_byclid(struct nfs_client *clp,
863 struct nfs_server *server;
864 LIST_HEAD(layout_list);
866 spin_lock(&clp->cl_lock);
869 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
870 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
876 spin_unlock(&clp->cl_lock);
878 if (list_empty(&layout_list))
880 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
884 * Called by the state manger to remove all layouts established under an
888 pnfs_destroy_all_layouts(struct nfs_client *clp)
890 nfs4_deviceid_mark_client_invalid(clp);
891 nfs4_deviceid_purge_client(clp);
893 pnfs_destroy_layouts_byclid(clp, false);
896 /* update lo->plh_stateid with new if is more recent */
898 pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
901 u32 oldseq, newseq, new_barrier = 0;
903 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
904 newseq = be32_to_cpu(new->seqid);
906 if (!pnfs_layout_is_valid(lo)) {
907 nfs4_stateid_copy(&lo->plh_stateid, new);
908 lo->plh_barrier = newseq;
909 pnfs_clear_layoutreturn_info(lo);
910 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
913 if (pnfs_seqid_is_newer(newseq, oldseq)) {
914 nfs4_stateid_copy(&lo->plh_stateid, new);
916 * Because of wraparound, we want to keep the barrier
917 * "close" to the current seqids.
919 new_barrier = newseq - atomic_read(&lo->plh_outstanding);
922 new_barrier = be32_to_cpu(new->seqid);
923 else if (new_barrier == 0)
925 if (pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
926 lo->plh_barrier = new_barrier;
930 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
931 const nfs4_stateid *stateid)
933 u32 seqid = be32_to_cpu(stateid->seqid);
935 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
938 /* lget is set to 1 if called from inside send_layoutget call chain */
940 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
942 return lo->plh_block_lgets ||
943 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
946 static struct nfs_server *
947 pnfs_find_server(struct inode *inode, struct nfs_open_context *ctx)
949 struct nfs_server *server;
952 server = NFS_SERVER(inode);
954 struct dentry *parent_dir = dget_parent(ctx->dentry);
955 server = NFS_SERVER(parent_dir->d_inode);
961 static void nfs4_free_pages(struct page **pages, size_t size)
968 for (i = 0; i < size; i++) {
971 __free_page(pages[i]);
976 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
981 pages = kmalloc_array(size, sizeof(struct page *), gfp_flags);
983 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
987 for (i = 0; i < size; i++) {
988 pages[i] = alloc_page(gfp_flags);
990 dprintk("%s: failed to allocate page\n", __func__);
991 nfs4_free_pages(pages, i);
999 static struct nfs4_layoutget *
1000 pnfs_alloc_init_layoutget_args(struct inode *ino,
1001 struct nfs_open_context *ctx,
1002 const nfs4_stateid *stateid,
1003 const struct pnfs_layout_range *range,
1006 struct nfs_server *server = pnfs_find_server(ino, ctx);
1007 size_t max_reply_sz = server->pnfs_curr_ld->max_layoutget_response;
1008 size_t max_pages = max_response_pages(server);
1009 struct nfs4_layoutget *lgp;
1011 dprintk("--> %s\n", __func__);
1013 lgp = kzalloc(sizeof(*lgp), gfp_flags);
1018 size_t npages = (max_reply_sz + PAGE_SIZE - 1) >> PAGE_SHIFT;
1019 if (npages < max_pages)
1023 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
1024 if (!lgp->args.layout.pages) {
1028 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
1029 lgp->res.layoutp = &lgp->args.layout;
1031 /* Don't confuse uninitialised result and success */
1032 lgp->res.status = -NFS4ERR_DELAY;
1034 lgp->args.minlength = PAGE_SIZE;
1035 if (lgp->args.minlength > range->length)
1036 lgp->args.minlength = range->length;
1038 loff_t i_size = i_size_read(ino);
1040 if (range->iomode == IOMODE_READ) {
1041 if (range->offset >= i_size)
1042 lgp->args.minlength = 0;
1043 else if (i_size - range->offset < lgp->args.minlength)
1044 lgp->args.minlength = i_size - range->offset;
1047 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
1048 pnfs_copy_range(&lgp->args.range, range);
1049 lgp->args.type = server->pnfs_curr_ld->id;
1050 lgp->args.inode = ino;
1051 lgp->args.ctx = get_nfs_open_context(ctx);
1052 nfs4_stateid_copy(&lgp->args.stateid, stateid);
1053 lgp->gfp_flags = gfp_flags;
1054 lgp->cred = get_cred(ctx->cred);
1058 void pnfs_layoutget_free(struct nfs4_layoutget *lgp)
1060 size_t max_pages = lgp->args.layout.pglen / PAGE_SIZE;
1062 nfs4_free_pages(lgp->args.layout.pages, max_pages);
1063 if (lgp->args.inode)
1064 pnfs_put_layout_hdr(NFS_I(lgp->args.inode)->layout);
1065 put_cred(lgp->cred);
1066 put_nfs_open_context(lgp->args.ctx);
1070 static void pnfs_clear_layoutcommit(struct inode *inode,
1071 struct list_head *head)
1073 struct nfs_inode *nfsi = NFS_I(inode);
1074 struct pnfs_layout_segment *lseg, *tmp;
1076 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1078 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
1079 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
1081 pnfs_lseg_dec_and_remove_zero(lseg, head);
1085 void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
1086 const nfs4_stateid *arg_stateid,
1087 const struct pnfs_layout_range *range,
1088 const nfs4_stateid *stateid)
1090 struct inode *inode = lo->plh_inode;
1093 spin_lock(&inode->i_lock);
1094 if (!pnfs_layout_is_valid(lo) || !arg_stateid ||
1095 !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid))
1098 u32 seq = be32_to_cpu(arg_stateid->seqid);
1100 pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq);
1101 pnfs_free_returned_lsegs(lo, &freeme, range, seq);
1102 pnfs_set_layout_stateid(lo, stateid, true);
1104 pnfs_mark_layout_stateid_invalid(lo, &freeme);
1106 pnfs_clear_layoutreturn_waitbit(lo);
1107 spin_unlock(&inode->i_lock);
1108 pnfs_free_lseg_list(&freeme);
1113 pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo,
1114 nfs4_stateid *stateid,
1115 enum pnfs_iomode *iomode)
1117 /* Serialise LAYOUTGET/LAYOUTRETURN */
1118 if (atomic_read(&lo->plh_outstanding) != 0)
1120 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
1122 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
1123 pnfs_get_layout_hdr(lo);
1124 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
1125 if (stateid != NULL) {
1126 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1127 if (lo->plh_return_seq != 0)
1128 stateid->seqid = cpu_to_be32(lo->plh_return_seq);
1131 *iomode = lo->plh_return_iomode;
1132 pnfs_clear_layoutreturn_info(lo);
1135 if (stateid != NULL)
1136 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1138 *iomode = IOMODE_ANY;
1143 pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args,
1144 struct pnfs_layout_hdr *lo,
1145 const nfs4_stateid *stateid,
1146 enum pnfs_iomode iomode)
1148 struct inode *inode = lo->plh_inode;
1150 args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id;
1151 args->inode = inode;
1152 args->range.iomode = iomode;
1153 args->range.offset = 0;
1154 args->range.length = NFS4_MAX_UINT64;
1156 nfs4_stateid_copy(&args->stateid, stateid);
1160 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, const nfs4_stateid *stateid,
1161 enum pnfs_iomode iomode, bool sync)
1163 struct inode *ino = lo->plh_inode;
1164 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1165 struct nfs4_layoutreturn *lrp;
1168 lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
1169 if (unlikely(lrp == NULL)) {
1171 spin_lock(&ino->i_lock);
1172 pnfs_clear_layoutreturn_waitbit(lo);
1173 spin_unlock(&ino->i_lock);
1174 pnfs_put_layout_hdr(lo);
1178 pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode);
1179 lrp->args.ld_private = &lrp->ld_private;
1180 lrp->clp = NFS_SERVER(ino)->nfs_client;
1181 lrp->cred = lo->plh_lc_cred;
1182 if (ld->prepare_layoutreturn)
1183 ld->prepare_layoutreturn(&lrp->args);
1185 status = nfs4_proc_layoutreturn(lrp, sync);
1187 dprintk("<-- %s status: %d\n", __func__, status);
1191 /* Return true if layoutreturn is needed */
1193 pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
1195 struct pnfs_layout_segment *s;
1196 enum pnfs_iomode iomode;
1199 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1202 seq = lo->plh_return_seq;
1203 iomode = lo->plh_return_iomode;
1205 /* Defer layoutreturn until all recalled lsegs are done */
1206 list_for_each_entry(s, &lo->plh_segs, pls_list) {
1207 if (seq && pnfs_seqid_is_newer(s->pls_seq, seq))
1209 if (iomode != IOMODE_ANY && s->pls_range.iomode != iomode)
1211 if (test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags))
1218 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo)
1220 struct inode *inode= lo->plh_inode;
1222 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1224 spin_lock(&inode->i_lock);
1225 if (pnfs_layout_need_return(lo)) {
1226 nfs4_stateid stateid;
1227 enum pnfs_iomode iomode;
1230 send = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
1231 spin_unlock(&inode->i_lock);
1233 /* Send an async layoutreturn so we dont deadlock */
1234 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
1237 spin_unlock(&inode->i_lock);
1241 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
1242 * when the layout segment list is empty.
1244 * Note that a pnfs_layout_hdr can exist with an empty layout segment
1245 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
1246 * deviceid is marked invalid.
1249 _pnfs_return_layout(struct inode *ino)
1251 struct pnfs_layout_hdr *lo = NULL;
1252 struct nfs_inode *nfsi = NFS_I(ino);
1253 LIST_HEAD(tmp_list);
1254 nfs4_stateid stateid;
1256 bool send, valid_layout;
1258 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
1260 spin_lock(&ino->i_lock);
1263 spin_unlock(&ino->i_lock);
1264 dprintk("NFS: %s no layout to return\n", __func__);
1267 /* Reference matched in nfs4_layoutreturn_release */
1268 pnfs_get_layout_hdr(lo);
1269 /* Is there an outstanding layoutreturn ? */
1270 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1271 spin_unlock(&ino->i_lock);
1272 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1273 TASK_UNINTERRUPTIBLE))
1274 goto out_put_layout_hdr;
1275 spin_lock(&ino->i_lock);
1277 valid_layout = pnfs_layout_is_valid(lo);
1278 pnfs_clear_layoutcommit(ino, &tmp_list);
1279 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL, 0);
1281 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
1282 struct pnfs_layout_range range = {
1283 .iomode = IOMODE_ANY,
1285 .length = NFS4_MAX_UINT64,
1287 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
1290 /* Don't send a LAYOUTRETURN if list was initially empty */
1291 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) ||
1293 spin_unlock(&ino->i_lock);
1294 dprintk("NFS: %s no layout segments to return\n", __func__);
1295 goto out_put_layout_hdr;
1298 send = pnfs_prepare_layoutreturn(lo, &stateid, NULL);
1299 spin_unlock(&ino->i_lock);
1301 status = pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true);
1303 pnfs_free_lseg_list(&tmp_list);
1304 pnfs_put_layout_hdr(lo);
1306 dprintk("<-- %s status: %d\n", __func__, status);
1311 pnfs_commit_and_return_layout(struct inode *inode)
1313 struct pnfs_layout_hdr *lo;
1316 spin_lock(&inode->i_lock);
1317 lo = NFS_I(inode)->layout;
1319 spin_unlock(&inode->i_lock);
1322 pnfs_get_layout_hdr(lo);
1323 /* Block new layoutgets and read/write to ds */
1324 lo->plh_block_lgets++;
1325 spin_unlock(&inode->i_lock);
1326 filemap_fdatawait(inode->i_mapping);
1327 ret = pnfs_layoutcommit_inode(inode, true);
1329 ret = _pnfs_return_layout(inode);
1330 spin_lock(&inode->i_lock);
1331 lo->plh_block_lgets--;
1332 spin_unlock(&inode->i_lock);
1333 pnfs_put_layout_hdr(lo);
1337 bool pnfs_roc(struct inode *ino,
1338 struct nfs4_layoutreturn_args *args,
1339 struct nfs4_layoutreturn_res *res,
1340 const struct cred *cred)
1342 struct nfs_inode *nfsi = NFS_I(ino);
1343 struct nfs_open_context *ctx;
1344 struct nfs4_state *state;
1345 struct pnfs_layout_hdr *lo;
1346 struct pnfs_layout_segment *lseg, *next;
1347 nfs4_stateid stateid;
1348 enum pnfs_iomode iomode = 0;
1349 bool layoutreturn = false, roc = false;
1350 bool skip_read = false;
1352 if (!nfs_have_layout(ino))
1356 spin_lock(&ino->i_lock);
1358 if (!lo || !pnfs_layout_is_valid(lo) ||
1359 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1363 pnfs_get_layout_hdr(lo);
1364 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1365 spin_unlock(&ino->i_lock);
1367 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1368 TASK_UNINTERRUPTIBLE);
1369 pnfs_put_layout_hdr(lo);
1373 /* no roc if we hold a delegation */
1374 if (nfs4_check_delegation(ino, FMODE_READ)) {
1375 if (nfs4_check_delegation(ino, FMODE_WRITE))
1380 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1384 /* Don't return layout if there is open file state */
1385 if (state->state & FMODE_WRITE)
1387 if (state->state & FMODE_READ)
1392 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) {
1393 if (skip_read && lseg->pls_range.iomode == IOMODE_READ)
1395 /* If we are sending layoutreturn, invalidate all valid lsegs */
1396 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags))
1399 * Note: mark lseg for return so pnfs_layout_remove_lseg
1400 * doesn't invalidate the layout for us.
1402 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1403 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs))
1405 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
1408 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1411 /* ROC in two conditions:
1412 * 1. there are ROC lsegs
1413 * 2. we don't send layoutreturn
1415 /* lo ref dropped in pnfs_roc_release() */
1416 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
1417 /* If the creds don't match, we can't compound the layoutreturn */
1418 if (!layoutreturn || cred != lo->plh_lc_cred)
1422 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode);
1423 res->lrs_present = 0;
1424 layoutreturn = false;
1427 spin_unlock(&ino->i_lock);
1429 pnfs_layoutcommit_inode(ino, true);
1431 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1432 if (ld->prepare_layoutreturn)
1433 ld->prepare_layoutreturn(args);
1434 pnfs_put_layout_hdr(lo);
1438 pnfs_send_layoutreturn(lo, &stateid, iomode, true);
1439 pnfs_put_layout_hdr(lo);
1443 int pnfs_roc_done(struct rpc_task *task, struct inode *inode,
1444 struct nfs4_layoutreturn_args **argpp,
1445 struct nfs4_layoutreturn_res **respp,
1448 struct nfs4_layoutreturn_args *arg = *argpp;
1449 int retval = -EAGAIN;
1453 /* Handle Layoutreturn errors */
1458 case -NFS4ERR_NOMATCHING_LAYOUT:
1459 /* Was there an RPC level error? If not, retry */
1460 if (task->tk_rpc_status == 0)
1462 /* If the call was not sent, let caller handle it */
1463 if (!RPC_WAS_SENT(task))
1466 * Otherwise, assume the call succeeded and
1467 * that we need to release the layout
1470 (*respp)->lrs_present = 0;
1473 case -NFS4ERR_DELAY:
1474 /* Let the caller handle the retry */
1475 *ret = -NFS4ERR_NOMATCHING_LAYOUT;
1477 case -NFS4ERR_OLD_STATEID:
1478 if (!nfs4_layoutreturn_refresh_stateid(&arg->stateid,
1479 &arg->range, inode))
1481 *ret = -NFS4ERR_NOMATCHING_LAYOUT;
1489 void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
1490 struct nfs4_layoutreturn_res *res,
1493 struct pnfs_layout_hdr *lo = args->layout;
1494 const nfs4_stateid *arg_stateid = NULL;
1495 const nfs4_stateid *res_stateid = NULL;
1496 struct nfs4_xdr_opaque_data *ld_private = args->ld_private;
1499 case -NFS4ERR_NOMATCHING_LAYOUT:
1502 if (res->lrs_present)
1503 res_stateid = &res->stateid;
1506 arg_stateid = &args->stateid;
1508 pnfs_layoutreturn_free_lsegs(lo, arg_stateid, &args->range,
1510 if (ld_private && ld_private->ops && ld_private->ops->free)
1511 ld_private->ops->free(ld_private);
1512 pnfs_put_layout_hdr(lo);
1513 trace_nfs4_layoutreturn_on_close(args->inode, 0);
1516 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1518 struct nfs_inode *nfsi = NFS_I(ino);
1519 struct pnfs_layout_hdr *lo;
1522 /* we might not have grabbed lo reference. so need to check under
1524 spin_lock(&ino->i_lock);
1526 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1527 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
1530 spin_unlock(&ino->i_lock);
1535 * Compare two layout segments for sorting into layout cache.
1536 * We want to preferentially return RW over RO layouts, so ensure those
1540 pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1541 const struct pnfs_layout_range *l2)
1545 /* high offset > low offset */
1546 d = l1->offset - l2->offset;
1550 /* short length > long length */
1551 d = l2->length - l1->length;
1555 /* read > read/write */
1556 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1560 pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1561 const struct pnfs_layout_range *l2)
1563 return pnfs_lseg_range_cmp(l1, l2) > 0;
1567 pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1568 struct pnfs_layout_segment *old)
1574 pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1575 struct pnfs_layout_segment *lseg,
1576 bool (*is_after)(const struct pnfs_layout_range *,
1577 const struct pnfs_layout_range *),
1578 bool (*do_merge)(struct pnfs_layout_segment *,
1579 struct pnfs_layout_segment *),
1580 struct list_head *free_me)
1582 struct pnfs_layout_segment *lp, *tmp;
1584 dprintk("%s:Begin\n", __func__);
1586 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1587 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1589 if (do_merge(lseg, lp)) {
1590 mark_lseg_invalid(lp, free_me);
1593 if (is_after(&lseg->pls_range, &lp->pls_range))
1595 list_add_tail(&lseg->pls_list, &lp->pls_list);
1596 dprintk("%s: inserted lseg %p "
1597 "iomode %d offset %llu length %llu before "
1598 "lp %p iomode %d offset %llu length %llu\n",
1599 __func__, lseg, lseg->pls_range.iomode,
1600 lseg->pls_range.offset, lseg->pls_range.length,
1601 lp, lp->pls_range.iomode, lp->pls_range.offset,
1602 lp->pls_range.length);
1605 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1606 dprintk("%s: inserted lseg %p "
1607 "iomode %d offset %llu length %llu at tail\n",
1608 __func__, lseg, lseg->pls_range.iomode,
1609 lseg->pls_range.offset, lseg->pls_range.length);
1611 pnfs_get_layout_hdr(lo);
1613 dprintk("%s:Return\n", __func__);
1615 EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1618 pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1619 struct pnfs_layout_segment *lseg,
1620 struct list_head *free_me)
1622 struct inode *inode = lo->plh_inode;
1623 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1625 if (ld->add_lseg != NULL)
1626 ld->add_lseg(lo, lseg, free_me);
1628 pnfs_generic_layout_insert_lseg(lo, lseg,
1629 pnfs_lseg_range_is_after,
1634 static struct pnfs_layout_hdr *
1635 alloc_init_layout_hdr(struct inode *ino,
1636 struct nfs_open_context *ctx,
1639 struct pnfs_layout_hdr *lo;
1641 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1644 refcount_set(&lo->plh_refcount, 1);
1645 INIT_LIST_HEAD(&lo->plh_layouts);
1646 INIT_LIST_HEAD(&lo->plh_segs);
1647 INIT_LIST_HEAD(&lo->plh_return_segs);
1648 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1649 lo->plh_inode = ino;
1650 lo->plh_lc_cred = get_cred(ctx->cred);
1651 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID;
1655 static struct pnfs_layout_hdr *
1656 pnfs_find_alloc_layout(struct inode *ino,
1657 struct nfs_open_context *ctx,
1659 __releases(&ino->i_lock)
1660 __acquires(&ino->i_lock)
1662 struct nfs_inode *nfsi = NFS_I(ino);
1663 struct pnfs_layout_hdr *new = NULL;
1665 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1667 if (nfsi->layout != NULL)
1669 spin_unlock(&ino->i_lock);
1670 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1671 spin_lock(&ino->i_lock);
1673 if (likely(nfsi->layout == NULL)) { /* Won the race? */
1676 } else if (new != NULL)
1677 pnfs_free_layout_hdr(new);
1679 pnfs_get_layout_hdr(nfsi->layout);
1680 return nfsi->layout;
1684 * iomode matching rules:
1685 * iomode lseg strict match
1687 * ----- ----- ------ -----
1692 * READ READ N/A true
1693 * READ RW true false
1694 * READ RW false true
1697 pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1698 const struct pnfs_layout_range *range,
1701 struct pnfs_layout_range range1;
1703 if ((range->iomode == IOMODE_RW &&
1704 ls_range->iomode != IOMODE_RW) ||
1705 (range->iomode != ls_range->iomode &&
1707 !pnfs_lseg_range_intersecting(ls_range, range))
1710 /* range1 covers only the first byte in the range */
1713 return pnfs_lseg_range_contained(ls_range, &range1);
1717 * lookup range in layout
1719 static struct pnfs_layout_segment *
1720 pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1721 struct pnfs_layout_range *range,
1724 struct pnfs_layout_segment *lseg, *ret = NULL;
1726 dprintk("%s:Begin\n", __func__);
1728 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1729 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1730 pnfs_lseg_range_match(&lseg->pls_range, range,
1732 ret = pnfs_get_lseg(lseg);
1737 dprintk("%s:Return lseg %p ref %d\n",
1738 __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0);
1743 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1744 * to the MDS or over pNFS
1746 * The nfs_inode read_io and write_io fields are cumulative counters reset
1747 * when there are no layout segments. Note that in pnfs_update_layout iomode
1748 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1751 * A return of true means use MDS I/O.
1754 * If a file's size is smaller than the file size threshold, data accesses
1755 * SHOULD be sent to the metadata server. If an I/O request has a length that
1756 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1757 * server. If both file size and I/O size are provided, the client SHOULD
1758 * reach or exceed both thresholds before sending its read or write
1759 * requests to the data server.
1761 static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1762 struct inode *ino, int iomode)
1764 struct nfs4_threshold *t = ctx->mdsthreshold;
1765 struct nfs_inode *nfsi = NFS_I(ino);
1766 loff_t fsize = i_size_read(ino);
1767 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1772 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1773 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1777 if (t->bm & THRESHOLD_RD) {
1778 dprintk("%s fsize %llu\n", __func__, fsize);
1780 if (fsize < t->rd_sz)
1783 if (t->bm & THRESHOLD_RD_IO) {
1784 dprintk("%s nfsi->read_io %llu\n", __func__,
1787 if (nfsi->read_io < t->rd_io_sz)
1792 if (t->bm & THRESHOLD_WR) {
1793 dprintk("%s fsize %llu\n", __func__, fsize);
1795 if (fsize < t->wr_sz)
1798 if (t->bm & THRESHOLD_WR_IO) {
1799 dprintk("%s nfsi->write_io %llu\n", __func__,
1802 if (nfsi->write_io < t->wr_io_sz)
1807 if (size_set && io_set) {
1810 } else if (size || io)
1813 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1817 static int pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
1820 * send layoutcommit as it can hold up layoutreturn due to lseg
1823 pnfs_layoutcommit_inode(lo->plh_inode, false);
1824 return wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
1825 nfs_wait_bit_killable,
1829 static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo)
1831 atomic_inc(&lo->plh_outstanding);
1834 static void nfs_layoutget_end(struct pnfs_layout_hdr *lo)
1836 if (atomic_dec_and_test(&lo->plh_outstanding))
1837 wake_up_var(&lo->plh_outstanding);
1840 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1842 unsigned long *bitlock = &lo->plh_flags;
1844 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1845 smp_mb__after_atomic();
1846 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1849 static void _add_to_server_list(struct pnfs_layout_hdr *lo,
1850 struct nfs_server *server)
1852 if (list_empty(&lo->plh_layouts)) {
1853 struct nfs_client *clp = server->nfs_client;
1855 /* The lo must be on the clp list if there is any
1856 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1858 spin_lock(&clp->cl_lock);
1859 if (list_empty(&lo->plh_layouts))
1860 list_add_tail(&lo->plh_layouts, &server->layouts);
1861 spin_unlock(&clp->cl_lock);
1866 * Layout segment is retreived from the server if not cached.
1867 * The appropriate layout segment is referenced and returned to the caller.
1869 struct pnfs_layout_segment *
1870 pnfs_update_layout(struct inode *ino,
1871 struct nfs_open_context *ctx,
1874 enum pnfs_iomode iomode,
1878 struct pnfs_layout_range arg = {
1884 struct nfs_server *server = NFS_SERVER(ino);
1885 struct nfs_client *clp = server->nfs_client;
1886 struct pnfs_layout_hdr *lo = NULL;
1887 struct pnfs_layout_segment *lseg = NULL;
1888 struct nfs4_layoutget *lgp;
1889 nfs4_stateid stateid;
1891 unsigned long giveup = jiffies + (clp->cl_lease_time << 1);
1894 if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
1895 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1896 PNFS_UPDATE_LAYOUT_NO_PNFS);
1900 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
1901 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1902 PNFS_UPDATE_LAYOUT_MDSTHRESH);
1907 lseg = ERR_PTR(nfs4_client_recover_expired_lease(clp));
1911 spin_lock(&ino->i_lock);
1912 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1914 spin_unlock(&ino->i_lock);
1915 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1916 PNFS_UPDATE_LAYOUT_NOMEM);
1920 /* Do we even need to bother with this? */
1921 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1922 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1923 PNFS_UPDATE_LAYOUT_BULK_RECALL);
1924 dprintk("%s matches recall, use MDS\n", __func__);
1928 /* if LAYOUTGET already failed once we don't try again */
1929 if (pnfs_layout_io_test_failed(lo, iomode)) {
1930 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1931 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
1936 * If the layout segment list is empty, but there are outstanding
1937 * layoutget calls, then they might be subject to a layoutrecall.
1939 if (list_empty(&lo->plh_segs) &&
1940 atomic_read(&lo->plh_outstanding) != 0) {
1941 spin_unlock(&ino->i_lock);
1942 lseg = ERR_PTR(wait_var_event_killable(&lo->plh_outstanding,
1943 !atomic_read(&lo->plh_outstanding)));
1945 goto out_put_layout_hdr;
1946 pnfs_put_layout_hdr(lo);
1950 lseg = pnfs_find_lseg(lo, &arg, strict_iomode);
1952 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1953 PNFS_UPDATE_LAYOUT_FOUND_CACHED);
1958 * Choose a stateid for the LAYOUTGET. If we don't have a layout
1959 * stateid, or it has been invalidated, then we must use the open
1962 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
1966 * The first layoutget for the file. Need to serialize per
1967 * RFC 5661 Errata 3208.
1969 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
1971 spin_unlock(&ino->i_lock);
1972 lseg = ERR_PTR(wait_on_bit(&lo->plh_flags,
1973 NFS_LAYOUT_FIRST_LAYOUTGET,
1976 goto out_put_layout_hdr;
1977 pnfs_put_layout_hdr(lo);
1978 dprintk("%s retrying\n", __func__);
1983 status = nfs4_select_rw_stateid(ctx->state,
1984 iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ,
1985 NULL, &stateid, NULL);
1987 lseg = ERR_PTR(status);
1988 trace_pnfs_update_layout(ino, pos, count,
1990 PNFS_UPDATE_LAYOUT_INVALID_OPEN);
1991 if (status != -EAGAIN)
1993 spin_unlock(&ino->i_lock);
1994 nfs4_schedule_stateid_recovery(server, ctx->state);
1995 pnfs_clear_first_layoutget(lo);
1996 pnfs_put_layout_hdr(lo);
2000 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
2004 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
2005 * for LAYOUTRETURN even if first is true.
2007 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
2008 spin_unlock(&ino->i_lock);
2009 dprintk("%s wait for layoutreturn\n", __func__);
2010 lseg = ERR_PTR(pnfs_prepare_to_retry_layoutget(lo));
2011 if (!IS_ERR(lseg)) {
2013 pnfs_clear_first_layoutget(lo);
2014 pnfs_put_layout_hdr(lo);
2015 dprintk("%s retrying\n", __func__);
2016 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
2017 lseg, PNFS_UPDATE_LAYOUT_RETRY);
2020 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2021 PNFS_UPDATE_LAYOUT_RETURN);
2022 goto out_put_layout_hdr;
2025 if (pnfs_layoutgets_blocked(lo)) {
2026 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2027 PNFS_UPDATE_LAYOUT_BLOCKED);
2030 nfs_layoutget_begin(lo);
2031 spin_unlock(&ino->i_lock);
2033 _add_to_server_list(lo, server);
2035 pg_offset = arg.offset & ~PAGE_MASK;
2037 arg.offset -= pg_offset;
2038 arg.length += pg_offset;
2040 if (arg.length != NFS4_MAX_UINT64)
2041 arg.length = PAGE_ALIGN(arg.length);
2043 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &stateid, &arg, gfp_flags);
2045 trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL,
2046 PNFS_UPDATE_LAYOUT_NOMEM);
2047 nfs_layoutget_end(lo);
2048 goto out_put_layout_hdr;
2051 lseg = nfs4_proc_layoutget(lgp, &timeout);
2052 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2053 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
2054 nfs_layoutget_end(lo);
2056 switch(PTR_ERR(lseg)) {
2058 if (time_after(jiffies, giveup))
2061 case -ERECALLCONFLICT:
2065 if (!nfs_error_is_fatal(PTR_ERR(lseg))) {
2066 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2069 goto out_put_layout_hdr;
2073 pnfs_clear_first_layoutget(lo);
2074 trace_pnfs_update_layout(ino, pos, count,
2075 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY);
2076 pnfs_put_layout_hdr(lo);
2080 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2085 pnfs_clear_first_layoutget(lo);
2086 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2087 PNFS_UPDATE_LAYOUT_EXIT);
2088 pnfs_put_layout_hdr(lo);
2090 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
2091 "(%s, offset: %llu, length: %llu)\n",
2092 __func__, ino->i_sb->s_id,
2093 (unsigned long long)NFS_FILEID(ino),
2094 IS_ERR_OR_NULL(lseg) ? "not found" : "found",
2095 iomode==IOMODE_RW ? "read/write" : "read-only",
2096 (unsigned long long)pos,
2097 (unsigned long long)count);
2100 spin_unlock(&ino->i_lock);
2101 goto out_put_layout_hdr;
2103 EXPORT_SYMBOL_GPL(pnfs_update_layout);
2106 pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
2108 switch (range->iomode) {
2115 if (range->offset == NFS4_MAX_UINT64)
2117 if (range->length == 0)
2119 if (range->length != NFS4_MAX_UINT64 &&
2120 range->length > NFS4_MAX_UINT64 - range->offset)
2125 static struct pnfs_layout_hdr *
2126 _pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx)
2128 struct pnfs_layout_hdr *lo;
2130 spin_lock(&ino->i_lock);
2131 lo = pnfs_find_alloc_layout(ino, ctx, GFP_KERNEL);
2134 if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags))
2136 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
2138 if (pnfs_layoutgets_blocked(lo))
2140 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags))
2142 nfs_layoutget_begin(lo);
2143 spin_unlock(&ino->i_lock);
2144 _add_to_server_list(lo, NFS_SERVER(ino));
2148 spin_unlock(&ino->i_lock);
2149 pnfs_put_layout_hdr(lo);
2153 extern const nfs4_stateid current_stateid;
2155 static void _lgopen_prepare_attached(struct nfs4_opendata *data,
2156 struct nfs_open_context *ctx)
2158 struct inode *ino = data->dentry->d_inode;
2159 struct pnfs_layout_range rng = {
2160 .iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2161 IOMODE_RW: IOMODE_READ,
2163 .length = NFS4_MAX_UINT64,
2165 struct nfs4_layoutget *lgp;
2166 struct pnfs_layout_hdr *lo;
2168 /* Heuristic: don't send layoutget if we have cached data */
2169 if (rng.iomode == IOMODE_READ &&
2170 (i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0))
2173 lo = _pnfs_grab_empty_layout(ino, ctx);
2176 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid,
2179 pnfs_clear_first_layoutget(lo);
2180 pnfs_put_layout_hdr(lo);
2184 data->o_arg.lg_args = &lgp->args;
2185 data->o_res.lg_res = &lgp->res;
2188 static void _lgopen_prepare_floating(struct nfs4_opendata *data,
2189 struct nfs_open_context *ctx)
2191 struct pnfs_layout_range rng = {
2192 .iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2193 IOMODE_RW: IOMODE_READ,
2195 .length = NFS4_MAX_UINT64,
2197 struct nfs4_layoutget *lgp;
2199 lgp = pnfs_alloc_init_layoutget_args(NULL, ctx, ¤t_stateid,
2204 data->o_arg.lg_args = &lgp->args;
2205 data->o_res.lg_res = &lgp->res;
2208 void pnfs_lgopen_prepare(struct nfs4_opendata *data,
2209 struct nfs_open_context *ctx)
2211 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
2213 if (!(pnfs_enabled_sb(server) &&
2214 server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN))
2216 /* Could check on max_ops, but currently hardcoded high enough */
2217 if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN))
2220 _lgopen_prepare_attached(data, ctx);
2222 _lgopen_prepare_floating(data, ctx);
2225 void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
2226 struct nfs_open_context *ctx)
2228 struct pnfs_layout_hdr *lo;
2229 struct pnfs_layout_segment *lseg;
2230 struct nfs_server *srv = NFS_SERVER(ino);
2235 dprintk("%s: entered with status %i\n", __func__, lgp->res.status);
2236 if (lgp->res.status) {
2237 switch (lgp->res.status) {
2241 * Halt lgopen attempts if the server doesn't recognise
2242 * the "current stateid" value, the layout type, or the
2243 * layoutget operation as being valid.
2244 * Also if it complains about too many ops in the compound
2245 * or of the request/reply being too big.
2247 case -NFS4ERR_BAD_STATEID:
2248 case -NFS4ERR_NOTSUPP:
2249 case -NFS4ERR_REP_TOO_BIG:
2250 case -NFS4ERR_REP_TOO_BIG_TO_CACHE:
2251 case -NFS4ERR_REQ_TOO_BIG:
2252 case -NFS4ERR_TOO_MANY_OPS:
2253 case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
2254 srv->caps &= ~NFS_CAP_LGOPEN;
2258 if (!lgp->args.inode) {
2259 lo = _pnfs_grab_empty_layout(ino, ctx);
2262 lgp->args.inode = ino;
2264 lo = NFS_I(lgp->args.inode)->layout;
2266 lseg = pnfs_layout_process(lgp);
2267 if (!IS_ERR(lseg)) {
2268 iomode = lgp->args.range.iomode;
2269 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2270 pnfs_put_lseg(lseg);
2274 void nfs4_lgopen_release(struct nfs4_layoutget *lgp)
2277 struct inode *inode = lgp->args.inode;
2279 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
2280 pnfs_clear_first_layoutget(lo);
2281 nfs_layoutget_end(lo);
2283 pnfs_layoutget_free(lgp);
2287 struct pnfs_layout_segment *
2288 pnfs_layout_process(struct nfs4_layoutget *lgp)
2290 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
2291 struct nfs4_layoutget_res *res = &lgp->res;
2292 struct pnfs_layout_segment *lseg;
2293 struct inode *ino = lo->plh_inode;
2296 if (!pnfs_sanity_check_layout_range(&res->range))
2297 return ERR_PTR(-EINVAL);
2299 /* Inject layout blob into I/O device driver */
2300 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
2301 if (IS_ERR_OR_NULL(lseg)) {
2303 lseg = ERR_PTR(-ENOMEM);
2305 dprintk("%s: Could not allocate layout: error %ld\n",
2306 __func__, PTR_ERR(lseg));
2310 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid);
2312 spin_lock(&ino->i_lock);
2313 if (pnfs_layoutgets_blocked(lo)) {
2314 dprintk("%s forget reply due to state\n", __func__);
2318 if (!pnfs_layout_is_valid(lo)) {
2319 /* We have a completely new layout */
2320 pnfs_set_layout_stateid(lo, &res->stateid, true);
2321 } else if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
2322 /* existing state ID, make sure the sequence number matches. */
2323 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
2324 dprintk("%s forget reply due to sequence\n", __func__);
2327 pnfs_set_layout_stateid(lo, &res->stateid, false);
2330 * We got an entirely new state ID. Mark all segments for the
2331 * inode invalid, and retry the layoutget
2333 pnfs_mark_layout_stateid_invalid(lo, &free_me);
2337 pnfs_get_lseg(lseg);
2338 pnfs_layout_insert_lseg(lo, lseg, &free_me);
2341 if (res->return_on_close)
2342 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
2344 spin_unlock(&ino->i_lock);
2345 pnfs_free_lseg_list(&free_me);
2349 spin_unlock(&ino->i_lock);
2350 lseg->pls_layout = lo;
2351 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
2352 return ERR_PTR(-EAGAIN);
2356 mark_lseg_invalid_or_return(struct pnfs_layout_segment *lseg,
2357 struct list_head *tmp_list)
2359 if (!mark_lseg_invalid(lseg, tmp_list))
2361 pnfs_cache_lseg_for_layoutreturn(lseg->pls_layout, lseg);
2366 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
2367 * @lo: pointer to layout header
2368 * @tmp_list: list header to be used with pnfs_free_lseg_list()
2369 * @return_range: describe layout segment ranges to be returned
2370 * @seq: stateid seqid to match
2372 * This function is mainly intended for use by layoutrecall. It attempts
2373 * to free the layout segment immediately, or else to mark it for return
2374 * as soon as its reference count drops to zero.
2377 * - 0: a layoutreturn needs to be scheduled.
2378 * - EBUSY: there are layout segment that are still in use.
2379 * - ENOENT: there are no layout segments that need to be returned.
2382 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
2383 struct list_head *tmp_list,
2384 const struct pnfs_layout_range *return_range,
2387 struct pnfs_layout_segment *lseg, *next;
2390 dprintk("%s:Begin lo %p\n", __func__, lo);
2392 assert_spin_locked(&lo->plh_inode->i_lock);
2394 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
2395 if (pnfs_match_lseg_recall(lseg, return_range, seq)) {
2396 dprintk("%s: marking lseg %p iomode %d "
2397 "offset %llu length %llu\n", __func__,
2398 lseg, lseg->pls_range.iomode,
2399 lseg->pls_range.offset,
2400 lseg->pls_range.length);
2401 if (mark_lseg_invalid_or_return(lseg, tmp_list))
2404 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
2408 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2412 if (!list_empty(&lo->plh_return_segs)) {
2413 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2420 void pnfs_error_mark_layout_for_return(struct inode *inode,
2421 struct pnfs_layout_segment *lseg)
2423 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
2424 struct pnfs_layout_range range = {
2425 .iomode = lseg->pls_range.iomode,
2427 .length = NFS4_MAX_UINT64,
2429 bool return_now = false;
2431 spin_lock(&inode->i_lock);
2432 if (!pnfs_layout_is_valid(lo)) {
2433 spin_unlock(&inode->i_lock);
2436 pnfs_set_plh_return_info(lo, range.iomode, 0);
2438 * mark all matching lsegs so that we are sure to have no live
2439 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
2442 if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, &range, 0) != -EBUSY) {
2443 nfs4_stateid stateid;
2444 enum pnfs_iomode iomode;
2446 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
2447 spin_unlock(&inode->i_lock);
2449 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
2451 spin_unlock(&inode->i_lock);
2452 nfs_commit_inode(inode, 0);
2455 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
2458 pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio)
2460 if (pgio->pg_lseg == NULL ||
2461 test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags))
2463 pnfs_put_lseg(pgio->pg_lseg);
2464 pgio->pg_lseg = NULL;
2466 EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout);
2469 * Check for any intersection between the request and the pgio->pg_lseg,
2470 * and if none, put this pgio->pg_lseg away.
2473 pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2475 if (pgio->pg_lseg && !pnfs_lseg_request_intersecting(pgio->pg_lseg, req)) {
2476 pnfs_put_lseg(pgio->pg_lseg);
2477 pgio->pg_lseg = NULL;
2482 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2484 u64 rd_size = req->wb_bytes;
2486 pnfs_generic_pg_check_layout(pgio);
2487 pnfs_generic_pg_check_range(pgio, req);
2488 if (pgio->pg_lseg == NULL) {
2489 if (pgio->pg_dreq == NULL)
2490 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
2492 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
2494 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2495 nfs_req_openctx(req),
2501 if (IS_ERR(pgio->pg_lseg)) {
2502 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2503 pgio->pg_lseg = NULL;
2507 /* If no lseg, fall back to read through mds */
2508 if (pgio->pg_lseg == NULL)
2509 nfs_pageio_reset_read_mds(pgio);
2512 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
2515 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
2516 struct nfs_page *req, u64 wb_size)
2518 pnfs_generic_pg_check_layout(pgio);
2519 pnfs_generic_pg_check_range(pgio, req);
2520 if (pgio->pg_lseg == NULL) {
2521 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2522 nfs_req_openctx(req),
2528 if (IS_ERR(pgio->pg_lseg)) {
2529 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2530 pgio->pg_lseg = NULL;
2534 /* If no lseg, fall back to write through mds */
2535 if (pgio->pg_lseg == NULL)
2536 nfs_pageio_reset_write_mds(pgio);
2538 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
2541 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
2543 if (desc->pg_lseg) {
2544 pnfs_put_lseg(desc->pg_lseg);
2545 desc->pg_lseg = NULL;
2548 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
2551 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
2552 * of bytes (maximum @req->wb_bytes) that can be coalesced.
2555 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
2556 struct nfs_page *prev, struct nfs_page *req)
2559 u64 seg_end, req_start, seg_left;
2561 size = nfs_generic_pg_test(pgio, prev, req);
2566 * 'size' contains the number of bytes left in the current page (up
2567 * to the original size asked for in @req->wb_bytes).
2569 * Calculate how many bytes are left in the layout segment
2570 * and if there are less bytes than 'size', return that instead.
2572 * Please also note that 'end_offset' is actually the offset of the
2573 * first byte that lies outside the pnfs_layout_range. FIXME?
2576 if (pgio->pg_lseg) {
2577 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset,
2578 pgio->pg_lseg->pls_range.length);
2579 req_start = req_offset(req);
2581 /* start of request is past the last byte of this segment */
2582 if (req_start >= seg_end)
2585 /* adjust 'size' iff there are fewer bytes left in the
2586 * segment than what nfs_generic_pg_test returned */
2587 seg_left = seg_end - req_start;
2588 if (seg_left < size)
2589 size = (unsigned int)seg_left;
2594 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
2596 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
2598 struct nfs_pageio_descriptor pgio;
2600 /* Resend all requests through the MDS */
2601 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
2602 hdr->completion_ops);
2603 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
2604 return nfs_pageio_resend(&pgio, hdr);
2606 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
2608 static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
2611 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
2612 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2613 PNFS_LAYOUTRET_ON_ERROR) {
2614 pnfs_return_layout(hdr->inode);
2616 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2617 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
2621 * Called by non rpc-based layout drivers
2623 void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
2625 if (likely(!hdr->pnfs_error)) {
2626 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
2627 hdr->mds_offset + hdr->res.count);
2628 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2630 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
2631 if (unlikely(hdr->pnfs_error))
2632 pnfs_ld_handle_write_error(hdr);
2633 hdr->mds_ops->rpc_release(hdr);
2635 EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
2638 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
2639 struct nfs_pgio_header *hdr)
2641 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2643 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2644 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2645 nfs_pageio_reset_write_mds(desc);
2646 mirror->pg_recoalesce = 1;
2648 hdr->completion_ops->completion(hdr);
2651 static enum pnfs_try_status
2652 pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
2653 const struct rpc_call_ops *call_ops,
2654 struct pnfs_layout_segment *lseg,
2657 struct inode *inode = hdr->inode;
2658 enum pnfs_try_status trypnfs;
2659 struct nfs_server *nfss = NFS_SERVER(inode);
2661 hdr->mds_ops = call_ops;
2663 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
2664 inode->i_ino, hdr->args.count, hdr->args.offset, how);
2665 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
2666 if (trypnfs != PNFS_NOT_ATTEMPTED)
2667 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
2668 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2673 pnfs_do_write(struct nfs_pageio_descriptor *desc,
2674 struct nfs_pgio_header *hdr, int how)
2676 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2677 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2678 enum pnfs_try_status trypnfs;
2680 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
2682 case PNFS_NOT_ATTEMPTED:
2683 pnfs_write_through_mds(desc, hdr);
2684 case PNFS_ATTEMPTED:
2686 case PNFS_TRY_AGAIN:
2687 /* cleanup hdr and prepare to redo pnfs */
2688 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2689 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2690 list_splice_init(&hdr->pages, &mirror->pg_list);
2691 mirror->pg_recoalesce = 1;
2693 hdr->mds_ops->rpc_release(hdr);
2697 static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
2699 pnfs_put_lseg(hdr->lseg);
2700 nfs_pgio_header_free(hdr);
2704 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
2706 struct nfs_pgio_header *hdr;
2709 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2711 desc->pg_error = -ENOMEM;
2712 return desc->pg_error;
2714 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
2716 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2717 ret = nfs_generic_pgio(desc, hdr);
2719 pnfs_do_write(desc, hdr, desc->pg_ioflags);
2723 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
2725 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
2727 struct nfs_pageio_descriptor pgio;
2729 /* Resend all requests through the MDS */
2730 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
2731 return nfs_pageio_resend(&pgio, hdr);
2733 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
2735 static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
2737 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
2738 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2739 PNFS_LAYOUTRET_ON_ERROR) {
2740 pnfs_return_layout(hdr->inode);
2742 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2743 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2747 * Called by non rpc-based layout drivers
2749 void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2751 if (likely(!hdr->pnfs_error))
2752 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2753 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2754 if (unlikely(hdr->pnfs_error))
2755 pnfs_ld_handle_read_error(hdr);
2756 hdr->mds_ops->rpc_release(hdr);
2758 EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
2761 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2762 struct nfs_pgio_header *hdr)
2764 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2766 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2767 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2768 nfs_pageio_reset_read_mds(desc);
2769 mirror->pg_recoalesce = 1;
2771 hdr->completion_ops->completion(hdr);
2775 * Call the appropriate parallel I/O subsystem read function.
2777 static enum pnfs_try_status
2778 pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2779 const struct rpc_call_ops *call_ops,
2780 struct pnfs_layout_segment *lseg)
2782 struct inode *inode = hdr->inode;
2783 struct nfs_server *nfss = NFS_SERVER(inode);
2784 enum pnfs_try_status trypnfs;
2786 hdr->mds_ops = call_ops;
2788 dprintk("%s: Reading ino:%lu %u@%llu\n",
2789 __func__, inode->i_ino, hdr->args.count, hdr->args.offset);
2791 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
2792 if (trypnfs != PNFS_NOT_ATTEMPTED)
2793 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
2794 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2798 /* Resend all requests through pnfs. */
2799 void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
2801 struct nfs_pageio_descriptor pgio;
2803 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2804 /* Prevent deadlocks with layoutreturn! */
2805 pnfs_put_lseg(hdr->lseg);
2808 nfs_pageio_init_read(&pgio, hdr->inode, false,
2809 hdr->completion_ops);
2810 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
2813 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
2816 pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
2818 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2819 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2820 enum pnfs_try_status trypnfs;
2822 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
2824 case PNFS_NOT_ATTEMPTED:
2825 pnfs_read_through_mds(desc, hdr);
2826 case PNFS_ATTEMPTED:
2828 case PNFS_TRY_AGAIN:
2829 /* cleanup hdr and prepare to redo pnfs */
2830 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2831 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2832 list_splice_init(&hdr->pages, &mirror->pg_list);
2833 mirror->pg_recoalesce = 1;
2835 hdr->mds_ops->rpc_release(hdr);
2839 static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
2841 pnfs_put_lseg(hdr->lseg);
2842 nfs_pgio_header_free(hdr);
2846 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
2848 struct nfs_pgio_header *hdr;
2851 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2853 desc->pg_error = -ENOMEM;
2854 return desc->pg_error;
2856 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
2857 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2858 ret = nfs_generic_pgio(desc, hdr);
2860 pnfs_do_read(desc, hdr);
2863 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
2865 static void pnfs_clear_layoutcommitting(struct inode *inode)
2867 unsigned long *bitlock = &NFS_I(inode)->flags;
2869 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
2870 smp_mb__after_atomic();
2871 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
2875 * There can be multiple RW segments.
2877 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
2879 struct pnfs_layout_segment *lseg;
2881 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
2882 if (lseg->pls_range.iomode == IOMODE_RW &&
2883 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
2884 list_add(&lseg->pls_lc_list, listp);
2888 static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
2890 struct pnfs_layout_segment *lseg, *tmp;
2892 /* Matched by references in pnfs_set_layoutcommit */
2893 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
2894 list_del_init(&lseg->pls_lc_list);
2895 pnfs_put_lseg(lseg);
2898 pnfs_clear_layoutcommitting(inode);
2901 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
2903 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
2905 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
2908 pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
2911 struct nfs_inode *nfsi = NFS_I(inode);
2912 bool mark_as_dirty = false;
2914 spin_lock(&inode->i_lock);
2915 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
2916 nfsi->layout->plh_lwb = end_pos;
2917 mark_as_dirty = true;
2918 dprintk("%s: Set layoutcommit for inode %lu ",
2919 __func__, inode->i_ino);
2920 } else if (end_pos > nfsi->layout->plh_lwb)
2921 nfsi->layout->plh_lwb = end_pos;
2922 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
2923 /* references matched in nfs4_layoutcommit_release */
2924 pnfs_get_lseg(lseg);
2926 spin_unlock(&inode->i_lock);
2927 dprintk("%s: lseg %p end_pos %llu\n",
2928 __func__, lseg, nfsi->layout->plh_lwb);
2930 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2931 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2933 mark_inode_dirty_sync(inode);
2935 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
2937 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
2939 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
2941 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
2942 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
2943 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
2947 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
2948 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
2949 * data to disk to allow the server to recover the data if it crashes.
2950 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
2951 * is off, and a COMMIT is sent to a data server, or
2952 * if WRITEs to a data server return NFS_DATA_SYNC.
2955 pnfs_layoutcommit_inode(struct inode *inode, bool sync)
2957 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2958 struct nfs4_layoutcommit_data *data;
2959 struct nfs_inode *nfsi = NFS_I(inode);
2963 if (!pnfs_layoutcommit_outstanding(inode))
2966 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
2969 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
2972 status = wait_on_bit_lock_action(&nfsi->flags,
2973 NFS_INO_LAYOUTCOMMITTING,
2974 nfs_wait_bit_killable,
2981 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
2982 data = kzalloc(sizeof(*data), GFP_NOFS);
2984 goto clear_layoutcommitting;
2987 spin_lock(&inode->i_lock);
2988 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
2991 INIT_LIST_HEAD(&data->lseg_list);
2992 pnfs_list_write_lseg(inode, &data->lseg_list);
2994 end_pos = nfsi->layout->plh_lwb;
2996 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
2997 spin_unlock(&inode->i_lock);
2999 data->args.inode = inode;
3000 data->cred = get_cred(nfsi->layout->plh_lc_cred);
3001 nfs_fattr_init(&data->fattr);
3002 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
3003 data->res.fattr = &data->fattr;
3005 data->args.lastbytewritten = end_pos - 1;
3007 data->args.lastbytewritten = U64_MAX;
3008 data->res.server = NFS_SERVER(inode);
3010 if (ld->prepare_layoutcommit) {
3011 status = ld->prepare_layoutcommit(&data->args);
3013 put_cred(data->cred);
3014 spin_lock(&inode->i_lock);
3015 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
3016 if (end_pos > nfsi->layout->plh_lwb)
3017 nfsi->layout->plh_lwb = end_pos;
3023 status = nfs4_proc_layoutcommit(data, sync);
3026 mark_inode_dirty_sync(inode);
3027 dprintk("<-- %s status %d\n", __func__, status);
3030 spin_unlock(&inode->i_lock);
3032 clear_layoutcommitting:
3033 pnfs_clear_layoutcommitting(inode);
3036 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
3039 pnfs_generic_sync(struct inode *inode, bool datasync)
3041 return pnfs_layoutcommit_inode(inode, true);
3043 EXPORT_SYMBOL_GPL(pnfs_generic_sync);
3045 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
3047 struct nfs4_threshold *thp;
3049 thp = kzalloc(sizeof(*thp), GFP_NOFS);
3051 dprintk("%s mdsthreshold allocation failed\n", __func__);
3057 #if IS_ENABLED(CONFIG_NFS_V4_2)
3059 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
3061 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
3062 struct nfs_server *server = NFS_SERVER(inode);
3063 struct nfs_inode *nfsi = NFS_I(inode);
3064 struct nfs42_layoutstat_data *data;
3065 struct pnfs_layout_hdr *hdr;
3068 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
3071 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
3074 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
3077 spin_lock(&inode->i_lock);
3078 if (!NFS_I(inode)->layout) {
3079 spin_unlock(&inode->i_lock);
3080 goto out_clear_layoutstats;
3082 hdr = NFS_I(inode)->layout;
3083 pnfs_get_layout_hdr(hdr);
3084 spin_unlock(&inode->i_lock);
3086 data = kzalloc(sizeof(*data), gfp_flags);
3092 data->args.fh = NFS_FH(inode);
3093 data->args.inode = inode;
3094 status = ld->prepare_layoutstats(&data->args);
3098 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
3101 dprintk("%s returns %d\n", __func__, status);
3107 pnfs_put_layout_hdr(hdr);
3108 out_clear_layoutstats:
3109 smp_mb__before_atomic();
3110 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
3111 smp_mb__after_atomic();
3114 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
3117 unsigned int layoutstats_timer;
3118 module_param(layoutstats_timer, uint, 0644);
3119 EXPORT_SYMBOL_GPL(layoutstats_timer);