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>
36 #include "nfs4trace.h"
37 #include "delegation.h"
40 #define NFSDBG_FACILITY NFSDBG_PNFS
41 #define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
46 * protects pnfs_modules_tbl.
48 static DEFINE_SPINLOCK(pnfs_spinlock);
51 * pnfs_modules_tbl holds all pnfs modules
53 static LIST_HEAD(pnfs_modules_tbl);
55 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo);
57 /* Return the registered pnfs layout driver module matching given id */
58 static struct pnfs_layoutdriver_type *
59 find_pnfs_driver_locked(u32 id)
61 struct pnfs_layoutdriver_type *local;
63 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
68 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
72 static struct pnfs_layoutdriver_type *
73 find_pnfs_driver(u32 id)
75 struct pnfs_layoutdriver_type *local;
77 spin_lock(&pnfs_spinlock);
78 local = find_pnfs_driver_locked(id);
79 if (local != NULL && !try_module_get(local->owner)) {
80 dprintk("%s: Could not grab reference on module\n", __func__);
83 spin_unlock(&pnfs_spinlock);
88 unset_pnfs_layoutdriver(struct nfs_server *nfss)
90 if (nfss->pnfs_curr_ld) {
91 if (nfss->pnfs_curr_ld->clear_layoutdriver)
92 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
93 /* Decrement the MDS count. Purge the deviceid cache if zero */
94 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
95 nfs4_deviceid_purge_client(nfss->nfs_client);
96 module_put(nfss->pnfs_curr_ld->owner);
98 nfss->pnfs_curr_ld = NULL;
102 * Try to set the server's pnfs module to the pnfs layout type specified by id.
103 * Currently only one pNFS layout driver per filesystem is supported.
105 * @id layout type. Zero (illegal layout type) indicates pNFS not in use.
108 set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
111 struct pnfs_layoutdriver_type *ld_type = NULL;
115 if (!(server->nfs_client->cl_exchange_flags &
116 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
117 printk(KERN_ERR "NFS: %s: id %u cl_exchange_flags 0x%x\n",
118 __func__, id, server->nfs_client->cl_exchange_flags);
121 ld_type = find_pnfs_driver(id);
123 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id);
124 ld_type = find_pnfs_driver(id);
126 dprintk("%s: No pNFS module found for %u.\n",
131 server->pnfs_curr_ld = ld_type;
132 if (ld_type->set_layoutdriver
133 && ld_type->set_layoutdriver(server, mntfh)) {
134 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
135 "driver %u.\n", __func__, id);
136 module_put(ld_type->owner);
139 /* Bump the MDS count */
140 atomic_inc(&server->nfs_client->cl_mds_count);
142 dprintk("%s: pNFS module for %u set\n", __func__, id);
146 dprintk("%s: Using NFSv4 I/O\n", __func__);
147 server->pnfs_curr_ld = NULL;
151 pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
153 int status = -EINVAL;
154 struct pnfs_layoutdriver_type *tmp;
156 if (ld_type->id == 0) {
157 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
160 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
161 printk(KERN_ERR "NFS: %s Layout driver must provide "
162 "alloc_lseg and free_lseg.\n", __func__);
166 spin_lock(&pnfs_spinlock);
167 tmp = find_pnfs_driver_locked(ld_type->id);
169 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
171 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
174 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
175 __func__, ld_type->id);
177 spin_unlock(&pnfs_spinlock);
181 EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
184 pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
186 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
187 spin_lock(&pnfs_spinlock);
188 list_del(&ld_type->pnfs_tblid);
189 spin_unlock(&pnfs_spinlock);
191 EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
194 * pNFS client layout cache
197 /* Need to hold i_lock if caller does not already hold reference */
199 pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
201 atomic_inc(&lo->plh_refcount);
204 static struct pnfs_layout_hdr *
205 pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
207 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
208 return ld->alloc_layout_hdr(ino, gfp_flags);
212 pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
214 struct nfs_server *server = NFS_SERVER(lo->plh_inode);
215 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
217 if (!list_empty(&lo->plh_layouts)) {
218 struct nfs_client *clp = server->nfs_client;
220 spin_lock(&clp->cl_lock);
221 list_del_init(&lo->plh_layouts);
222 spin_unlock(&clp->cl_lock);
224 put_rpccred(lo->plh_lc_cred);
225 return ld->free_layout_hdr(lo);
229 pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
231 struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
232 dprintk("%s: freeing layout cache %p\n", __func__, lo);
234 /* Reset MDS Threshold I/O counters */
240 pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
242 struct inode *inode = lo->plh_inode;
244 pnfs_layoutreturn_before_put_layout_hdr(lo);
246 if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
247 if (!list_empty(&lo->plh_segs))
248 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
249 pnfs_detach_layout_hdr(lo);
250 spin_unlock(&inode->i_lock);
251 pnfs_free_layout_hdr(lo);
256 * Mark a pnfs_layout_hdr and all associated layout segments as invalid
258 * In order to continue using the pnfs_layout_hdr, a full recovery
260 * Note that caller must hold inode->i_lock.
263 pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
264 struct list_head *lseg_list)
266 struct pnfs_layout_range range = {
267 .iomode = IOMODE_ANY,
269 .length = NFS4_MAX_UINT64,
272 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
273 return pnfs_mark_matching_lsegs_invalid(lo, lseg_list, &range, 0);
277 pnfs_iomode_to_fail_bit(u32 iomode)
279 return iomode == IOMODE_RW ?
280 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
284 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
286 lo->plh_retry_timestamp = jiffies;
287 if (!test_and_set_bit(fail_bit, &lo->plh_flags))
288 atomic_inc(&lo->plh_refcount);
292 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
294 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
295 atomic_dec(&lo->plh_refcount);
299 pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
301 struct inode *inode = lo->plh_inode;
302 struct pnfs_layout_range range = {
305 .length = NFS4_MAX_UINT64,
309 spin_lock(&inode->i_lock);
310 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
311 pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0);
312 spin_unlock(&inode->i_lock);
313 pnfs_free_lseg_list(&head);
314 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
315 iomode == IOMODE_RW ? "RW" : "READ");
319 pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
321 unsigned long start, end;
322 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
324 if (test_bit(fail_bit, &lo->plh_flags) == 0)
327 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
328 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
329 /* It is time to retry the failed layoutgets */
330 pnfs_layout_clear_fail_bit(lo, fail_bit);
337 init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg)
339 INIT_LIST_HEAD(&lseg->pls_list);
340 INIT_LIST_HEAD(&lseg->pls_lc_list);
341 atomic_set(&lseg->pls_refcount, 1);
343 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
344 lseg->pls_layout = lo;
347 static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
349 struct inode *ino = lseg->pls_layout->plh_inode;
351 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
355 pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
356 struct pnfs_layout_segment *lseg)
358 struct inode *inode = lo->plh_inode;
360 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
361 list_del_init(&lseg->pls_list);
362 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
363 atomic_dec(&lo->plh_refcount);
364 if (list_empty(&lo->plh_segs))
365 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
366 rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq);
370 pnfs_put_lseg(struct pnfs_layout_segment *lseg)
372 struct pnfs_layout_hdr *lo;
378 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
379 atomic_read(&lseg->pls_refcount),
380 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
382 lo = lseg->pls_layout;
383 inode = lo->plh_inode;
385 if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
386 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
387 spin_unlock(&inode->i_lock);
390 pnfs_get_layout_hdr(lo);
391 pnfs_layout_remove_lseg(lo, lseg);
392 spin_unlock(&inode->i_lock);
393 pnfs_free_lseg(lseg);
394 pnfs_put_layout_hdr(lo);
397 EXPORT_SYMBOL_GPL(pnfs_put_lseg);
399 static void pnfs_free_lseg_async_work(struct work_struct *work)
401 struct pnfs_layout_segment *lseg;
402 struct pnfs_layout_hdr *lo;
404 lseg = container_of(work, struct pnfs_layout_segment, pls_work);
405 lo = lseg->pls_layout;
407 pnfs_free_lseg(lseg);
408 pnfs_put_layout_hdr(lo);
411 static void pnfs_free_lseg_async(struct pnfs_layout_segment *lseg)
413 INIT_WORK(&lseg->pls_work, pnfs_free_lseg_async_work);
414 schedule_work(&lseg->pls_work);
418 pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg)
423 assert_spin_locked(&lseg->pls_layout->plh_inode->i_lock);
425 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
426 atomic_read(&lseg->pls_refcount),
427 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
428 if (atomic_dec_and_test(&lseg->pls_refcount)) {
429 struct pnfs_layout_hdr *lo = lseg->pls_layout;
430 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags))
432 pnfs_get_layout_hdr(lo);
433 pnfs_layout_remove_lseg(lo, lseg);
434 pnfs_free_lseg_async(lseg);
437 EXPORT_SYMBOL_GPL(pnfs_put_lseg_locked);
440 end_offset(u64 start, u64 len)
445 return end >= start ? end : NFS4_MAX_UINT64;
449 * is l2 fully contained in l1?
451 * [----------------------------------)
456 pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
457 const struct pnfs_layout_range *l2)
459 u64 start1 = l1->offset;
460 u64 end1 = end_offset(start1, l1->length);
461 u64 start2 = l2->offset;
462 u64 end2 = end_offset(start2, l2->length);
464 return (start1 <= start2) && (end1 >= end2);
468 * is l1 and l2 intersecting?
470 * [----------------------------------)
475 pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1,
476 const struct pnfs_layout_range *l2)
478 u64 start1 = l1->offset;
479 u64 end1 = end_offset(start1, l1->length);
480 u64 start2 = l2->offset;
481 u64 end2 = end_offset(start2, l2->length);
483 return (end1 == NFS4_MAX_UINT64 || end1 > start2) &&
484 (end2 == NFS4_MAX_UINT64 || end2 > start1);
488 should_free_lseg(const struct pnfs_layout_range *lseg_range,
489 const struct pnfs_layout_range *recall_range)
491 return (recall_range->iomode == IOMODE_ANY ||
492 lseg_range->iomode == recall_range->iomode) &&
493 pnfs_lseg_range_intersecting(lseg_range, recall_range);
496 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
497 struct list_head *tmp_list)
499 if (!atomic_dec_and_test(&lseg->pls_refcount))
501 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
502 list_add(&lseg->pls_list, tmp_list);
506 /* Returns 1 if lseg is removed from list, 0 otherwise */
507 static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
508 struct list_head *tmp_list)
512 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
513 /* Remove the reference keeping the lseg in the
514 * list. It will now be removed when all
515 * outstanding io is finished.
517 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
518 atomic_read(&lseg->pls_refcount));
519 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
526 * Compare 2 layout stateid sequence ids, to see which is newer,
527 * taking into account wraparound issues.
529 static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
531 return (s32)(s1 - s2) > 0;
535 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later
536 * @lo: layout header containing the lsegs
537 * @tmp_list: list head where doomed lsegs should go
538 * @recall_range: optional recall range argument to match (may be NULL)
539 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0)
541 * Walk the list of lsegs in the layout header, and tear down any that should
542 * be destroyed. If "recall_range" is specified then the segment must match
543 * that range. If "seq" is non-zero, then only match segments that were handed
544 * out at or before that sequence.
546 * Returns number of matching invalid lsegs remaining in list after scanning
547 * it and purging them.
550 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
551 struct list_head *tmp_list,
552 const struct pnfs_layout_range *recall_range,
555 struct pnfs_layout_segment *lseg, *next;
558 dprintk("%s:Begin lo %p\n", __func__, lo);
560 if (list_empty(&lo->plh_segs))
562 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
564 should_free_lseg(&lseg->pls_range, recall_range)) {
565 if (seq && pnfs_seqid_is_newer(lseg->pls_seq, seq))
567 dprintk("%s: freeing lseg %p iomode %d seq %u"
568 "offset %llu length %llu\n", __func__,
569 lseg, lseg->pls_range.iomode, lseg->pls_seq,
570 lseg->pls_range.offset, lseg->pls_range.length);
571 if (!mark_lseg_invalid(lseg, tmp_list))
574 dprintk("%s:Return %i\n", __func__, remaining);
578 /* note free_me must contain lsegs from a single layout_hdr */
580 pnfs_free_lseg_list(struct list_head *free_me)
582 struct pnfs_layout_segment *lseg, *tmp;
584 if (list_empty(free_me))
587 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
588 list_del(&lseg->pls_list);
589 pnfs_free_lseg(lseg);
594 pnfs_destroy_layout(struct nfs_inode *nfsi)
596 struct pnfs_layout_hdr *lo;
599 spin_lock(&nfsi->vfs_inode.i_lock);
602 pnfs_get_layout_hdr(lo);
603 pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
604 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
605 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
606 spin_unlock(&nfsi->vfs_inode.i_lock);
607 pnfs_free_lseg_list(&tmp_list);
608 pnfs_put_layout_hdr(lo);
610 spin_unlock(&nfsi->vfs_inode.i_lock);
612 EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
615 pnfs_layout_add_bulk_destroy_list(struct inode *inode,
616 struct list_head *layout_list)
618 struct pnfs_layout_hdr *lo;
621 spin_lock(&inode->i_lock);
622 lo = NFS_I(inode)->layout;
623 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
624 pnfs_get_layout_hdr(lo);
625 list_add(&lo->plh_bulk_destroy, layout_list);
628 spin_unlock(&inode->i_lock);
632 /* Caller must hold rcu_read_lock and clp->cl_lock */
634 pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
635 struct nfs_server *server,
636 struct list_head *layout_list)
638 struct pnfs_layout_hdr *lo, *next;
641 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
642 inode = igrab(lo->plh_inode);
645 list_del_init(&lo->plh_layouts);
646 if (pnfs_layout_add_bulk_destroy_list(inode, layout_list))
649 spin_unlock(&clp->cl_lock);
651 spin_lock(&clp->cl_lock);
659 pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
662 struct pnfs_layout_hdr *lo;
664 LIST_HEAD(lseg_list);
667 while (!list_empty(layout_list)) {
668 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
670 dprintk("%s freeing layout for inode %lu\n", __func__,
671 lo->plh_inode->i_ino);
672 inode = lo->plh_inode;
674 pnfs_layoutcommit_inode(inode, false);
676 spin_lock(&inode->i_lock);
677 list_del_init(&lo->plh_bulk_destroy);
678 if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
680 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
683 spin_unlock(&inode->i_lock);
684 pnfs_free_lseg_list(&lseg_list);
685 /* Free all lsegs that are attached to commit buckets */
686 nfs_commit_inode(inode, 0);
687 pnfs_put_layout_hdr(lo);
694 pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
695 struct nfs_fsid *fsid,
698 struct nfs_server *server;
699 LIST_HEAD(layout_list);
701 spin_lock(&clp->cl_lock);
704 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
705 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
707 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
713 spin_unlock(&clp->cl_lock);
715 if (list_empty(&layout_list))
717 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
721 pnfs_destroy_layouts_byclid(struct nfs_client *clp,
724 struct nfs_server *server;
725 LIST_HEAD(layout_list);
727 spin_lock(&clp->cl_lock);
730 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
731 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
737 spin_unlock(&clp->cl_lock);
739 if (list_empty(&layout_list))
741 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
745 * Called by the state manger to remove all layouts established under an
749 pnfs_destroy_all_layouts(struct nfs_client *clp)
751 nfs4_deviceid_mark_client_invalid(clp);
752 nfs4_deviceid_purge_client(clp);
754 pnfs_destroy_layouts_byclid(clp, false);
757 /* update lo->plh_stateid with new if is more recent */
759 pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
762 u32 oldseq, newseq, new_barrier;
763 int empty = list_empty(&lo->plh_segs);
765 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
766 newseq = be32_to_cpu(new->seqid);
767 if (empty || pnfs_seqid_is_newer(newseq, oldseq)) {
768 nfs4_stateid_copy(&lo->plh_stateid, new);
769 if (update_barrier) {
770 new_barrier = be32_to_cpu(new->seqid);
772 /* Because of wraparound, we want to keep the barrier
773 * "close" to the current seqids.
775 new_barrier = newseq - atomic_read(&lo->plh_outstanding);
777 if (empty || pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
778 lo->plh_barrier = new_barrier;
783 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
784 const nfs4_stateid *stateid)
786 u32 seqid = be32_to_cpu(stateid->seqid);
788 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
791 /* lget is set to 1 if called from inside send_layoutget call chain */
793 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
795 return lo->plh_block_lgets ||
796 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
800 * Get layout from server.
801 * for now, assume that whole file layouts are requested.
803 * arg->length: all ones
805 static struct pnfs_layout_segment *
806 send_layoutget(struct pnfs_layout_hdr *lo,
807 struct nfs_open_context *ctx,
808 nfs4_stateid *stateid,
809 const struct pnfs_layout_range *range,
810 long *timeout, gfp_t gfp_flags)
812 struct inode *ino = lo->plh_inode;
813 struct nfs_server *server = NFS_SERVER(ino);
814 struct nfs4_layoutget *lgp;
817 dprintk("--> %s\n", __func__);
820 * Synchronously retrieve layout information from server and
821 * store in lseg. If we race with a concurrent seqid morphing
822 * op, then re-send the LAYOUTGET.
824 lgp = kzalloc(sizeof(*lgp), gfp_flags);
826 return ERR_PTR(-ENOMEM);
828 i_size = i_size_read(ino);
830 lgp->args.minlength = PAGE_SIZE;
831 if (lgp->args.minlength > range->length)
832 lgp->args.minlength = range->length;
833 if (range->iomode == IOMODE_READ) {
834 if (range->offset >= i_size)
835 lgp->args.minlength = 0;
836 else if (i_size - range->offset < lgp->args.minlength)
837 lgp->args.minlength = i_size - range->offset;
839 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
840 pnfs_copy_range(&lgp->args.range, range);
841 lgp->args.type = server->pnfs_curr_ld->id;
842 lgp->args.inode = ino;
843 lgp->args.ctx = get_nfs_open_context(ctx);
844 nfs4_stateid_copy(&lgp->args.stateid, stateid);
845 lgp->gfp_flags = gfp_flags;
846 lgp->cred = lo->plh_lc_cred;
848 return nfs4_proc_layoutget(lgp, timeout, gfp_flags);
851 static void pnfs_clear_layoutcommit(struct inode *inode,
852 struct list_head *head)
854 struct nfs_inode *nfsi = NFS_I(inode);
855 struct pnfs_layout_segment *lseg, *tmp;
857 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
859 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
860 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
862 pnfs_lseg_dec_and_remove_zero(lseg, head);
866 void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
868 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
869 smp_mb__after_atomic();
870 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
871 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
875 pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo)
877 if (test_and_set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
879 lo->plh_return_iomode = 0;
880 lo->plh_return_seq = 0;
881 pnfs_get_layout_hdr(lo);
882 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
887 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, const nfs4_stateid *stateid,
888 enum pnfs_iomode iomode, bool sync)
890 struct inode *ino = lo->plh_inode;
891 struct nfs4_layoutreturn *lrp;
894 lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
895 if (unlikely(lrp == NULL)) {
897 spin_lock(&ino->i_lock);
898 pnfs_clear_layoutreturn_waitbit(lo);
899 spin_unlock(&ino->i_lock);
900 pnfs_put_layout_hdr(lo);
904 nfs4_stateid_copy(&lrp->args.stateid, stateid);
905 lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id;
906 lrp->args.inode = ino;
907 lrp->args.range.iomode = iomode;
908 lrp->args.range.offset = 0;
909 lrp->args.range.length = NFS4_MAX_UINT64;
910 lrp->args.layout = lo;
911 lrp->clp = NFS_SERVER(ino)->nfs_client;
912 lrp->cred = lo->plh_lc_cred;
914 status = nfs4_proc_layoutreturn(lrp, sync);
916 dprintk("<-- %s status: %d\n", __func__, status);
920 /* Return true if layoutreturn is needed */
922 pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
924 struct pnfs_layout_segment *s;
926 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
929 /* Defer layoutreturn until all lsegs are done */
930 list_for_each_entry(s, &lo->plh_segs, pls_list) {
931 if (test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags))
938 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo)
940 struct inode *inode= lo->plh_inode;
942 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
944 spin_lock(&inode->i_lock);
945 if (pnfs_layout_need_return(lo)) {
946 nfs4_stateid stateid;
947 enum pnfs_iomode iomode;
950 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
951 stateid.seqid = cpu_to_be32(lo->plh_return_seq);
952 iomode = lo->plh_return_iomode;
953 send = pnfs_prepare_layoutreturn(lo);
954 spin_unlock(&inode->i_lock);
956 /* Send an async layoutreturn so we dont deadlock */
957 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
960 spin_unlock(&inode->i_lock);
964 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
965 * when the layout segment list is empty.
967 * Note that a pnfs_layout_hdr can exist with an empty layout segment
968 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
969 * deviceid is marked invalid.
972 _pnfs_return_layout(struct inode *ino)
974 struct pnfs_layout_hdr *lo = NULL;
975 struct nfs_inode *nfsi = NFS_I(ino);
977 nfs4_stateid stateid;
978 int status = 0, empty;
981 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
983 spin_lock(&ino->i_lock);
986 spin_unlock(&ino->i_lock);
987 dprintk("NFS: %s no layout to return\n", __func__);
990 nfs4_stateid_copy(&stateid, &nfsi->layout->plh_stateid);
991 /* Reference matched in nfs4_layoutreturn_release */
992 pnfs_get_layout_hdr(lo);
993 empty = list_empty(&lo->plh_segs);
994 pnfs_clear_layoutcommit(ino, &tmp_list);
995 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL, 0);
997 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
998 struct pnfs_layout_range range = {
999 .iomode = IOMODE_ANY,
1001 .length = NFS4_MAX_UINT64,
1003 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
1006 /* Don't send a LAYOUTRETURN if list was initially empty */
1008 spin_unlock(&ino->i_lock);
1009 dprintk("NFS: %s no layout segments to return\n", __func__);
1010 goto out_put_layout_hdr;
1013 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
1014 send = pnfs_prepare_layoutreturn(lo);
1015 spin_unlock(&ino->i_lock);
1016 pnfs_free_lseg_list(&tmp_list);
1018 status = pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true);
1020 pnfs_put_layout_hdr(lo);
1022 dprintk("<-- %s status: %d\n", __func__, status);
1025 EXPORT_SYMBOL_GPL(_pnfs_return_layout);
1028 pnfs_commit_and_return_layout(struct inode *inode)
1030 struct pnfs_layout_hdr *lo;
1033 spin_lock(&inode->i_lock);
1034 lo = NFS_I(inode)->layout;
1036 spin_unlock(&inode->i_lock);
1039 pnfs_get_layout_hdr(lo);
1040 /* Block new layoutgets and read/write to ds */
1041 lo->plh_block_lgets++;
1042 spin_unlock(&inode->i_lock);
1043 filemap_fdatawait(inode->i_mapping);
1044 ret = pnfs_layoutcommit_inode(inode, true);
1046 ret = _pnfs_return_layout(inode);
1047 spin_lock(&inode->i_lock);
1048 lo->plh_block_lgets--;
1049 spin_unlock(&inode->i_lock);
1050 pnfs_put_layout_hdr(lo);
1054 bool pnfs_roc(struct inode *ino)
1056 struct nfs_inode *nfsi = NFS_I(ino);
1057 struct nfs_open_context *ctx;
1058 struct nfs4_state *state;
1059 struct pnfs_layout_hdr *lo;
1060 struct pnfs_layout_segment *lseg, *tmp;
1061 nfs4_stateid stateid;
1062 LIST_HEAD(tmp_list);
1063 bool found = false, layoutreturn = false, roc = false;
1065 spin_lock(&ino->i_lock);
1067 if (!lo || test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
1070 /* no roc if we hold a delegation */
1071 if (nfs4_check_delegation(ino, FMODE_READ))
1074 list_for_each_entry(ctx, &nfsi->open_files, list) {
1076 /* Don't return layout if there is open file state */
1077 if (state != NULL && state->state != 0)
1081 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
1082 /* always send layoutreturn if being marked so */
1083 if (test_and_clear_bit(NFS_LAYOUT_RETURN_REQUESTED,
1085 layoutreturn = pnfs_prepare_layoutreturn(lo);
1087 list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
1088 /* If we are sending layoutreturn, invalidate all valid lsegs */
1089 if (layoutreturn || test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
1090 mark_lseg_invalid(lseg, &tmp_list);
1093 /* ROC in two conditions:
1094 * 1. there are ROC lsegs
1095 * 2. we don't send layoutreturn
1097 if (found && !layoutreturn) {
1098 /* lo ref dropped in pnfs_roc_release() */
1099 pnfs_get_layout_hdr(lo);
1104 spin_unlock(&ino->i_lock);
1105 pnfs_free_lseg_list(&tmp_list);
1106 pnfs_layoutcommit_inode(ino, true);
1108 pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true);
1112 void pnfs_roc_release(struct inode *ino)
1114 struct pnfs_layout_hdr *lo;
1116 spin_lock(&ino->i_lock);
1117 lo = NFS_I(ino)->layout;
1118 pnfs_clear_layoutreturn_waitbit(lo);
1119 if (atomic_dec_and_test(&lo->plh_refcount)) {
1120 pnfs_detach_layout_hdr(lo);
1121 spin_unlock(&ino->i_lock);
1122 pnfs_free_layout_hdr(lo);
1124 spin_unlock(&ino->i_lock);
1127 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
1129 struct pnfs_layout_hdr *lo;
1131 spin_lock(&ino->i_lock);
1132 lo = NFS_I(ino)->layout;
1133 pnfs_mark_layout_returned_if_empty(lo);
1134 if (pnfs_seqid_is_newer(barrier, lo->plh_barrier))
1135 lo->plh_barrier = barrier;
1136 spin_unlock(&ino->i_lock);
1137 trace_nfs4_layoutreturn_on_close(ino, 0);
1140 void pnfs_roc_get_barrier(struct inode *ino, u32 *barrier)
1142 struct nfs_inode *nfsi = NFS_I(ino);
1143 struct pnfs_layout_hdr *lo;
1146 spin_lock(&ino->i_lock);
1148 current_seqid = be32_to_cpu(lo->plh_stateid.seqid);
1150 /* Since close does not return a layout stateid for use as
1151 * a barrier, we choose the worst-case barrier.
1153 *barrier = current_seqid + atomic_read(&lo->plh_outstanding);
1154 spin_unlock(&ino->i_lock);
1157 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1159 struct nfs_inode *nfsi = NFS_I(ino);
1160 struct pnfs_layout_hdr *lo;
1163 /* we might not have grabbed lo reference. so need to check under
1165 spin_lock(&ino->i_lock);
1167 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
1169 spin_unlock(&ino->i_lock);
1172 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
1178 * Compare two layout segments for sorting into layout cache.
1179 * We want to preferentially return RW over RO layouts, so ensure those
1183 pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1184 const struct pnfs_layout_range *l2)
1188 /* high offset > low offset */
1189 d = l1->offset - l2->offset;
1193 /* short length > long length */
1194 d = l2->length - l1->length;
1198 /* read > read/write */
1199 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1203 pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1204 const struct pnfs_layout_range *l2)
1206 return pnfs_lseg_range_cmp(l1, l2) > 0;
1210 pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1211 struct pnfs_layout_segment *old)
1217 pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1218 struct pnfs_layout_segment *lseg,
1219 bool (*is_after)(const struct pnfs_layout_range *,
1220 const struct pnfs_layout_range *),
1221 bool (*do_merge)(struct pnfs_layout_segment *,
1222 struct pnfs_layout_segment *),
1223 struct list_head *free_me)
1225 struct pnfs_layout_segment *lp, *tmp;
1227 dprintk("%s:Begin\n", __func__);
1229 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1230 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1232 if (do_merge(lseg, lp)) {
1233 mark_lseg_invalid(lp, free_me);
1236 if (is_after(&lseg->pls_range, &lp->pls_range))
1238 list_add_tail(&lseg->pls_list, &lp->pls_list);
1239 dprintk("%s: inserted lseg %p "
1240 "iomode %d offset %llu length %llu before "
1241 "lp %p iomode %d offset %llu length %llu\n",
1242 __func__, lseg, lseg->pls_range.iomode,
1243 lseg->pls_range.offset, lseg->pls_range.length,
1244 lp, lp->pls_range.iomode, lp->pls_range.offset,
1245 lp->pls_range.length);
1248 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1249 dprintk("%s: inserted lseg %p "
1250 "iomode %d offset %llu length %llu at tail\n",
1251 __func__, lseg, lseg->pls_range.iomode,
1252 lseg->pls_range.offset, lseg->pls_range.length);
1254 pnfs_get_layout_hdr(lo);
1256 dprintk("%s:Return\n", __func__);
1258 EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1261 pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1262 struct pnfs_layout_segment *lseg,
1263 struct list_head *free_me)
1265 struct inode *inode = lo->plh_inode;
1266 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1268 if (ld->add_lseg != NULL)
1269 ld->add_lseg(lo, lseg, free_me);
1271 pnfs_generic_layout_insert_lseg(lo, lseg,
1272 pnfs_lseg_range_is_after,
1277 static struct pnfs_layout_hdr *
1278 alloc_init_layout_hdr(struct inode *ino,
1279 struct nfs_open_context *ctx,
1282 struct pnfs_layout_hdr *lo;
1284 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1287 atomic_set(&lo->plh_refcount, 1);
1288 INIT_LIST_HEAD(&lo->plh_layouts);
1289 INIT_LIST_HEAD(&lo->plh_segs);
1290 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1291 lo->plh_inode = ino;
1292 lo->plh_lc_cred = get_rpccred(ctx->cred);
1296 static struct pnfs_layout_hdr *
1297 pnfs_find_alloc_layout(struct inode *ino,
1298 struct nfs_open_context *ctx,
1301 struct nfs_inode *nfsi = NFS_I(ino);
1302 struct pnfs_layout_hdr *new = NULL;
1304 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1306 if (nfsi->layout != NULL)
1308 spin_unlock(&ino->i_lock);
1309 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1310 spin_lock(&ino->i_lock);
1312 if (likely(nfsi->layout == NULL)) { /* Won the race? */
1315 } else if (new != NULL)
1316 pnfs_free_layout_hdr(new);
1318 pnfs_get_layout_hdr(nfsi->layout);
1319 return nfsi->layout;
1323 * iomode matching rules:
1334 pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1335 const struct pnfs_layout_range *range)
1337 struct pnfs_layout_range range1;
1339 if ((range->iomode == IOMODE_RW &&
1340 ls_range->iomode != IOMODE_RW) ||
1341 !pnfs_lseg_range_intersecting(ls_range, range))
1344 /* range1 covers only the first byte in the range */
1347 return pnfs_lseg_range_contained(ls_range, &range1);
1351 * lookup range in layout
1353 static struct pnfs_layout_segment *
1354 pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1355 struct pnfs_layout_range *range)
1357 struct pnfs_layout_segment *lseg, *ret = NULL;
1359 dprintk("%s:Begin\n", __func__);
1361 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1362 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1363 !test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
1364 pnfs_lseg_range_match(&lseg->pls_range, range)) {
1365 ret = pnfs_get_lseg(lseg);
1370 dprintk("%s:Return lseg %p ref %d\n",
1371 __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
1376 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1377 * to the MDS or over pNFS
1379 * The nfs_inode read_io and write_io fields are cumulative counters reset
1380 * when there are no layout segments. Note that in pnfs_update_layout iomode
1381 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1384 * A return of true means use MDS I/O.
1387 * If a file's size is smaller than the file size threshold, data accesses
1388 * SHOULD be sent to the metadata server. If an I/O request has a length that
1389 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1390 * server. If both file size and I/O size are provided, the client SHOULD
1391 * reach or exceed both thresholds before sending its read or write
1392 * requests to the data server.
1394 static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1395 struct inode *ino, int iomode)
1397 struct nfs4_threshold *t = ctx->mdsthreshold;
1398 struct nfs_inode *nfsi = NFS_I(ino);
1399 loff_t fsize = i_size_read(ino);
1400 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1405 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1406 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1410 if (t->bm & THRESHOLD_RD) {
1411 dprintk("%s fsize %llu\n", __func__, fsize);
1413 if (fsize < t->rd_sz)
1416 if (t->bm & THRESHOLD_RD_IO) {
1417 dprintk("%s nfsi->read_io %llu\n", __func__,
1420 if (nfsi->read_io < t->rd_io_sz)
1425 if (t->bm & THRESHOLD_WR) {
1426 dprintk("%s fsize %llu\n", __func__, fsize);
1428 if (fsize < t->wr_sz)
1431 if (t->bm & THRESHOLD_WR_IO) {
1432 dprintk("%s nfsi->write_io %llu\n", __func__,
1435 if (nfsi->write_io < t->wr_io_sz)
1440 if (size_set && io_set) {
1443 } else if (size || io)
1446 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1450 static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
1453 * send layoutcommit as it can hold up layoutreturn due to lseg
1456 pnfs_layoutcommit_inode(lo->plh_inode, false);
1457 return !wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
1458 nfs_wait_bit_killable,
1459 TASK_UNINTERRUPTIBLE);
1462 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1464 unsigned long *bitlock = &lo->plh_flags;
1466 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1467 smp_mb__after_atomic();
1468 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1472 * Layout segment is retreived from the server if not cached.
1473 * The appropriate layout segment is referenced and returned to the caller.
1475 struct pnfs_layout_segment *
1476 pnfs_update_layout(struct inode *ino,
1477 struct nfs_open_context *ctx,
1480 enum pnfs_iomode iomode,
1483 struct pnfs_layout_range arg = {
1488 unsigned pg_offset, seq;
1489 struct nfs_server *server = NFS_SERVER(ino);
1490 struct nfs_client *clp = server->nfs_client;
1491 struct pnfs_layout_hdr *lo = NULL;
1492 struct pnfs_layout_segment *lseg = NULL;
1493 nfs4_stateid stateid;
1495 unsigned long giveup = jiffies + rpc_get_timeout(server->client);
1498 if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
1499 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1500 PNFS_UPDATE_LAYOUT_NO_PNFS);
1504 if (iomode == IOMODE_READ && i_size_read(ino) == 0) {
1505 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1506 PNFS_UPDATE_LAYOUT_RD_ZEROLEN);
1510 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
1511 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1512 PNFS_UPDATE_LAYOUT_MDSTHRESH);
1518 spin_lock(&ino->i_lock);
1519 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1521 spin_unlock(&ino->i_lock);
1522 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1523 PNFS_UPDATE_LAYOUT_NOMEM);
1527 /* Do we even need to bother with this? */
1528 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1529 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1530 PNFS_UPDATE_LAYOUT_BULK_RECALL);
1531 dprintk("%s matches recall, use MDS\n", __func__);
1535 /* if LAYOUTGET already failed once we don't try again */
1536 if (pnfs_layout_io_test_failed(lo, iomode)) {
1537 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1538 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
1542 lseg = pnfs_find_lseg(lo, &arg);
1544 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1545 PNFS_UPDATE_LAYOUT_FOUND_CACHED);
1549 if (!nfs4_valid_open_stateid(ctx->state)) {
1550 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1551 PNFS_UPDATE_LAYOUT_INVALID_OPEN);
1556 * Choose a stateid for the LAYOUTGET. If we don't have a layout
1557 * stateid, or it has been invalidated, then we must use the open
1560 if (lo->plh_stateid.seqid == 0 ||
1561 test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
1564 * The first layoutget for the file. Need to serialize per
1565 * RFC 5661 Errata 3208.
1567 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
1569 spin_unlock(&ino->i_lock);
1570 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_FIRST_LAYOUTGET,
1571 TASK_UNINTERRUPTIBLE);
1572 pnfs_put_layout_hdr(lo);
1573 dprintk("%s retrying\n", __func__);
1579 seq = read_seqbegin(&ctx->state->seqlock);
1580 nfs4_stateid_copy(&stateid, &ctx->state->stateid);
1581 } while (read_seqretry(&ctx->state->seqlock, seq));
1583 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
1587 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
1588 * for LAYOUTRETURN even if first is true.
1590 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1591 spin_unlock(&ino->i_lock);
1592 dprintk("%s wait for layoutreturn\n", __func__);
1593 if (pnfs_prepare_to_retry_layoutget(lo)) {
1595 pnfs_clear_first_layoutget(lo);
1596 pnfs_put_layout_hdr(lo);
1597 dprintk("%s retrying\n", __func__);
1598 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1599 lseg, PNFS_UPDATE_LAYOUT_RETRY);
1602 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1603 PNFS_UPDATE_LAYOUT_RETURN);
1604 goto out_put_layout_hdr;
1607 if (pnfs_layoutgets_blocked(lo)) {
1608 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1609 PNFS_UPDATE_LAYOUT_BLOCKED);
1612 atomic_inc(&lo->plh_outstanding);
1613 spin_unlock(&ino->i_lock);
1615 if (list_empty(&lo->plh_layouts)) {
1616 /* The lo must be on the clp list if there is any
1617 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1619 spin_lock(&clp->cl_lock);
1620 if (list_empty(&lo->plh_layouts))
1621 list_add_tail(&lo->plh_layouts, &server->layouts);
1622 spin_unlock(&clp->cl_lock);
1625 pg_offset = arg.offset & ~PAGE_MASK;
1627 arg.offset -= pg_offset;
1628 arg.length += pg_offset;
1630 if (arg.length != NFS4_MAX_UINT64)
1631 arg.length = PAGE_ALIGN(arg.length);
1633 lseg = send_layoutget(lo, ctx, &stateid, &arg, &timeout, gfp_flags);
1634 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1635 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
1637 switch(PTR_ERR(lseg)) {
1638 case -ERECALLCONFLICT:
1639 if (time_after(jiffies, giveup))
1643 pnfs_put_layout_hdr(lo);
1645 pnfs_clear_first_layoutget(lo);
1647 trace_pnfs_update_layout(ino, pos, count,
1648 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY);
1653 if (!nfs_error_is_fatal(PTR_ERR(lseg))) {
1654 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
1659 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
1662 atomic_dec(&lo->plh_outstanding);
1665 pnfs_clear_first_layoutget(lo);
1666 pnfs_put_layout_hdr(lo);
1668 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1669 "(%s, offset: %llu, length: %llu)\n",
1670 __func__, ino->i_sb->s_id,
1671 (unsigned long long)NFS_FILEID(ino),
1672 IS_ERR_OR_NULL(lseg) ? "not found" : "found",
1673 iomode==IOMODE_RW ? "read/write" : "read-only",
1674 (unsigned long long)pos,
1675 (unsigned long long)count);
1678 spin_unlock(&ino->i_lock);
1679 goto out_put_layout_hdr;
1681 EXPORT_SYMBOL_GPL(pnfs_update_layout);
1684 pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
1686 switch (range->iomode) {
1693 if (range->offset == NFS4_MAX_UINT64)
1695 if (range->length == 0)
1697 if (range->length != NFS4_MAX_UINT64 &&
1698 range->length > NFS4_MAX_UINT64 - range->offset)
1703 struct pnfs_layout_segment *
1704 pnfs_layout_process(struct nfs4_layoutget *lgp)
1706 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
1707 struct nfs4_layoutget_res *res = &lgp->res;
1708 struct pnfs_layout_segment *lseg;
1709 struct inode *ino = lo->plh_inode;
1712 if (!pnfs_sanity_check_layout_range(&res->range))
1713 return ERR_PTR(-EINVAL);
1715 /* Inject layout blob into I/O device driver */
1716 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1717 if (IS_ERR_OR_NULL(lseg)) {
1719 lseg = ERR_PTR(-ENOMEM);
1721 dprintk("%s: Could not allocate layout: error %ld\n",
1722 __func__, PTR_ERR(lseg));
1726 init_lseg(lo, lseg);
1727 lseg->pls_range = res->range;
1728 lseg->pls_seq = be32_to_cpu(res->stateid.seqid);
1730 spin_lock(&ino->i_lock);
1731 if (pnfs_layoutgets_blocked(lo)) {
1732 dprintk("%s forget reply due to state\n", __func__);
1736 if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
1737 /* existing state ID, make sure the sequence number matches. */
1738 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
1739 dprintk("%s forget reply due to sequence\n", __func__);
1742 pnfs_set_layout_stateid(lo, &res->stateid, false);
1745 * We got an entirely new state ID. Mark all segments for the
1746 * inode invalid, and don't bother validating the stateid
1749 pnfs_mark_matching_lsegs_invalid(lo, &free_me, NULL, 0);
1751 nfs4_stateid_copy(&lo->plh_stateid, &res->stateid);
1752 lo->plh_barrier = be32_to_cpu(res->stateid.seqid);
1755 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
1757 pnfs_get_lseg(lseg);
1758 pnfs_layout_insert_lseg(lo, lseg, &free_me);
1760 if (res->return_on_close)
1761 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
1763 spin_unlock(&ino->i_lock);
1764 pnfs_free_lseg_list(&free_me);
1768 spin_unlock(&ino->i_lock);
1769 lseg->pls_layout = lo;
1770 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1771 return ERR_PTR(-EAGAIN);
1775 pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
1778 if (lo->plh_return_iomode == iomode)
1780 if (lo->plh_return_iomode != 0)
1781 iomode = IOMODE_ANY;
1782 lo->plh_return_iomode = iomode;
1783 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
1784 if (!lo->plh_return_seq || pnfs_seqid_is_newer(seq, lo->plh_return_seq))
1785 lo->plh_return_seq = seq;
1789 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
1790 * @lo: pointer to layout header
1791 * @tmp_list: list header to be used with pnfs_free_lseg_list()
1792 * @return_range: describe layout segment ranges to be returned
1794 * This function is mainly intended for use by layoutrecall. It attempts
1795 * to free the layout segment immediately, or else to mark it for return
1796 * as soon as its reference count drops to zero.
1799 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
1800 struct list_head *tmp_list,
1801 const struct pnfs_layout_range *return_range,
1804 struct pnfs_layout_segment *lseg, *next;
1807 dprintk("%s:Begin lo %p\n", __func__, lo);
1809 if (list_empty(&lo->plh_segs))
1812 assert_spin_locked(&lo->plh_inode->i_lock);
1814 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
1815 if (should_free_lseg(&lseg->pls_range, return_range)) {
1816 dprintk("%s: marking lseg %p iomode %d "
1817 "offset %llu length %llu\n", __func__,
1818 lseg, lseg->pls_range.iomode,
1819 lseg->pls_range.offset,
1820 lseg->pls_range.length);
1821 if (mark_lseg_invalid(lseg, tmp_list))
1824 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1828 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
1833 void pnfs_error_mark_layout_for_return(struct inode *inode,
1834 struct pnfs_layout_segment *lseg)
1836 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
1837 struct pnfs_layout_range range = {
1838 .iomode = lseg->pls_range.iomode,
1840 .length = NFS4_MAX_UINT64,
1843 bool return_now = false;
1845 spin_lock(&inode->i_lock);
1846 pnfs_set_plh_return_info(lo, range.iomode, lseg->pls_seq);
1848 * mark all matching lsegs so that we are sure to have no live
1849 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
1852 if (!pnfs_mark_matching_lsegs_return(lo, &free_me,
1853 &range, lseg->pls_seq)) {
1854 nfs4_stateid stateid;
1855 enum pnfs_iomode iomode = lo->plh_return_iomode;
1857 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
1858 return_now = pnfs_prepare_layoutreturn(lo);
1859 spin_unlock(&inode->i_lock);
1861 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
1863 spin_unlock(&inode->i_lock);
1864 nfs_commit_inode(inode, 0);
1866 pnfs_free_lseg_list(&free_me);
1868 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
1871 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1873 u64 rd_size = req->wb_bytes;
1875 if (pgio->pg_lseg == NULL) {
1876 if (pgio->pg_dreq == NULL)
1877 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
1879 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
1881 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1887 if (IS_ERR(pgio->pg_lseg)) {
1888 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
1889 pgio->pg_lseg = NULL;
1893 /* If no lseg, fall back to read through mds */
1894 if (pgio->pg_lseg == NULL)
1895 nfs_pageio_reset_read_mds(pgio);
1898 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
1901 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
1902 struct nfs_page *req, u64 wb_size)
1904 if (pgio->pg_lseg == NULL) {
1905 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1911 if (IS_ERR(pgio->pg_lseg)) {
1912 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
1913 pgio->pg_lseg = NULL;
1917 /* If no lseg, fall back to write through mds */
1918 if (pgio->pg_lseg == NULL)
1919 nfs_pageio_reset_write_mds(pgio);
1921 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
1924 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
1926 if (desc->pg_lseg) {
1927 pnfs_put_lseg(desc->pg_lseg);
1928 desc->pg_lseg = NULL;
1931 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
1934 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
1935 * of bytes (maximum @req->wb_bytes) that can be coalesced.
1938 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
1939 struct nfs_page *prev, struct nfs_page *req)
1942 u64 seg_end, req_start, seg_left;
1944 size = nfs_generic_pg_test(pgio, prev, req);
1949 * 'size' contains the number of bytes left in the current page (up
1950 * to the original size asked for in @req->wb_bytes).
1952 * Calculate how many bytes are left in the layout segment
1953 * and if there are less bytes than 'size', return that instead.
1955 * Please also note that 'end_offset' is actually the offset of the
1956 * first byte that lies outside the pnfs_layout_range. FIXME?
1959 if (pgio->pg_lseg) {
1960 seg_end = end_offset(pgio->pg_lseg->pls_range.offset,
1961 pgio->pg_lseg->pls_range.length);
1962 req_start = req_offset(req);
1963 WARN_ON_ONCE(req_start >= seg_end);
1964 /* start of request is past the last byte of this segment */
1965 if (req_start >= seg_end) {
1966 /* reference the new lseg */
1967 if (pgio->pg_ops->pg_cleanup)
1968 pgio->pg_ops->pg_cleanup(pgio);
1969 if (pgio->pg_ops->pg_init)
1970 pgio->pg_ops->pg_init(pgio, req);
1974 /* adjust 'size' iff there are fewer bytes left in the
1975 * segment than what nfs_generic_pg_test returned */
1976 seg_left = seg_end - req_start;
1977 if (seg_left < size)
1978 size = (unsigned int)seg_left;
1983 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
1985 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
1987 struct nfs_pageio_descriptor pgio;
1989 /* Resend all requests through the MDS */
1990 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
1991 hdr->completion_ops);
1992 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
1993 return nfs_pageio_resend(&pgio, hdr);
1995 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
1997 static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
2000 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
2001 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2002 PNFS_LAYOUTRET_ON_ERROR) {
2003 pnfs_return_layout(hdr->inode);
2005 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2006 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
2010 * Called by non rpc-based layout drivers
2012 void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
2014 if (likely(!hdr->pnfs_error)) {
2015 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
2016 hdr->mds_offset + hdr->res.count);
2017 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2019 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
2020 if (unlikely(hdr->pnfs_error))
2021 pnfs_ld_handle_write_error(hdr);
2022 hdr->mds_ops->rpc_release(hdr);
2024 EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
2027 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
2028 struct nfs_pgio_header *hdr)
2030 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2032 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2033 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2034 nfs_pageio_reset_write_mds(desc);
2035 mirror->pg_recoalesce = 1;
2037 nfs_pgio_data_destroy(hdr);
2041 static enum pnfs_try_status
2042 pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
2043 const struct rpc_call_ops *call_ops,
2044 struct pnfs_layout_segment *lseg,
2047 struct inode *inode = hdr->inode;
2048 enum pnfs_try_status trypnfs;
2049 struct nfs_server *nfss = NFS_SERVER(inode);
2051 hdr->mds_ops = call_ops;
2053 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
2054 inode->i_ino, hdr->args.count, hdr->args.offset, how);
2055 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
2056 if (trypnfs != PNFS_NOT_ATTEMPTED)
2057 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
2058 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2063 pnfs_do_write(struct nfs_pageio_descriptor *desc,
2064 struct nfs_pgio_header *hdr, int how)
2066 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2067 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2068 enum pnfs_try_status trypnfs;
2070 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
2071 if (trypnfs == PNFS_NOT_ATTEMPTED)
2072 pnfs_write_through_mds(desc, hdr);
2075 static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
2077 pnfs_put_lseg(hdr->lseg);
2078 nfs_pgio_header_free(hdr);
2082 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
2084 struct nfs_pgio_header *hdr;
2087 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2089 desc->pg_error = -ENOMEM;
2090 return desc->pg_error;
2092 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
2094 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2095 ret = nfs_generic_pgio(desc, hdr);
2097 pnfs_do_write(desc, hdr, desc->pg_ioflags);
2101 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
2103 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
2105 struct nfs_pageio_descriptor pgio;
2107 /* Resend all requests through the MDS */
2108 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
2109 return nfs_pageio_resend(&pgio, hdr);
2111 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
2113 static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
2115 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
2116 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2117 PNFS_LAYOUTRET_ON_ERROR) {
2118 pnfs_return_layout(hdr->inode);
2120 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2121 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2125 * Called by non rpc-based layout drivers
2127 void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2129 if (likely(!hdr->pnfs_error)) {
2130 __nfs4_read_done_cb(hdr);
2131 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2133 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2134 if (unlikely(hdr->pnfs_error))
2135 pnfs_ld_handle_read_error(hdr);
2136 hdr->mds_ops->rpc_release(hdr);
2138 EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
2141 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2142 struct nfs_pgio_header *hdr)
2144 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2146 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2147 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2148 nfs_pageio_reset_read_mds(desc);
2149 mirror->pg_recoalesce = 1;
2151 nfs_pgio_data_destroy(hdr);
2156 * Call the appropriate parallel I/O subsystem read function.
2158 static enum pnfs_try_status
2159 pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2160 const struct rpc_call_ops *call_ops,
2161 struct pnfs_layout_segment *lseg)
2163 struct inode *inode = hdr->inode;
2164 struct nfs_server *nfss = NFS_SERVER(inode);
2165 enum pnfs_try_status trypnfs;
2167 hdr->mds_ops = call_ops;
2169 dprintk("%s: Reading ino:%lu %u@%llu\n",
2170 __func__, inode->i_ino, hdr->args.count, hdr->args.offset);
2172 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
2173 if (trypnfs != PNFS_NOT_ATTEMPTED)
2174 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
2175 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2179 /* Resend all requests through pnfs. */
2180 void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
2182 struct nfs_pageio_descriptor pgio;
2184 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2185 nfs_pageio_init_read(&pgio, hdr->inode, false,
2186 hdr->completion_ops);
2187 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
2190 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
2193 pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
2195 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2196 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2197 enum pnfs_try_status trypnfs;
2199 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
2200 if (trypnfs == PNFS_TRY_AGAIN)
2201 pnfs_read_resend_pnfs(hdr);
2202 if (trypnfs == PNFS_NOT_ATTEMPTED || hdr->task.tk_status)
2203 pnfs_read_through_mds(desc, hdr);
2206 static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
2208 pnfs_put_lseg(hdr->lseg);
2209 nfs_pgio_header_free(hdr);
2213 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
2215 struct nfs_pgio_header *hdr;
2218 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2220 desc->pg_error = -ENOMEM;
2221 return desc->pg_error;
2223 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
2224 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2225 ret = nfs_generic_pgio(desc, hdr);
2227 pnfs_do_read(desc, hdr);
2230 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
2232 static void pnfs_clear_layoutcommitting(struct inode *inode)
2234 unsigned long *bitlock = &NFS_I(inode)->flags;
2236 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
2237 smp_mb__after_atomic();
2238 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
2242 * There can be multiple RW segments.
2244 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
2246 struct pnfs_layout_segment *lseg;
2248 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
2249 if (lseg->pls_range.iomode == IOMODE_RW &&
2250 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
2251 list_add(&lseg->pls_lc_list, listp);
2255 static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
2257 struct pnfs_layout_segment *lseg, *tmp;
2259 /* Matched by references in pnfs_set_layoutcommit */
2260 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
2261 list_del_init(&lseg->pls_lc_list);
2262 pnfs_put_lseg(lseg);
2265 pnfs_clear_layoutcommitting(inode);
2268 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
2270 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
2272 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
2275 pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
2278 struct nfs_inode *nfsi = NFS_I(inode);
2279 bool mark_as_dirty = false;
2281 spin_lock(&inode->i_lock);
2282 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
2283 nfsi->layout->plh_lwb = end_pos;
2284 mark_as_dirty = true;
2285 dprintk("%s: Set layoutcommit for inode %lu ",
2286 __func__, inode->i_ino);
2287 } else if (end_pos > nfsi->layout->plh_lwb)
2288 nfsi->layout->plh_lwb = end_pos;
2289 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
2290 /* references matched in nfs4_layoutcommit_release */
2291 pnfs_get_lseg(lseg);
2293 spin_unlock(&inode->i_lock);
2294 dprintk("%s: lseg %p end_pos %llu\n",
2295 __func__, lseg, nfsi->layout->plh_lwb);
2297 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2298 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2300 mark_inode_dirty_sync(inode);
2302 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
2304 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
2306 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
2308 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
2309 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
2310 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
2314 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
2315 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
2316 * data to disk to allow the server to recover the data if it crashes.
2317 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
2318 * is off, and a COMMIT is sent to a data server, or
2319 * if WRITEs to a data server return NFS_DATA_SYNC.
2322 pnfs_layoutcommit_inode(struct inode *inode, bool sync)
2324 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2325 struct nfs4_layoutcommit_data *data;
2326 struct nfs_inode *nfsi = NFS_I(inode);
2330 if (!pnfs_layoutcommit_outstanding(inode))
2333 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
2336 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
2339 status = wait_on_bit_lock_action(&nfsi->flags,
2340 NFS_INO_LAYOUTCOMMITTING,
2341 nfs_wait_bit_killable,
2348 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
2349 data = kzalloc(sizeof(*data), GFP_NOFS);
2351 goto clear_layoutcommitting;
2354 spin_lock(&inode->i_lock);
2355 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
2358 INIT_LIST_HEAD(&data->lseg_list);
2359 pnfs_list_write_lseg(inode, &data->lseg_list);
2361 end_pos = nfsi->layout->plh_lwb;
2363 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
2364 spin_unlock(&inode->i_lock);
2366 data->args.inode = inode;
2367 data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
2368 nfs_fattr_init(&data->fattr);
2369 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
2370 data->res.fattr = &data->fattr;
2371 data->args.lastbytewritten = end_pos - 1;
2372 data->res.server = NFS_SERVER(inode);
2374 if (ld->prepare_layoutcommit) {
2375 status = ld->prepare_layoutcommit(&data->args);
2377 put_rpccred(data->cred);
2378 spin_lock(&inode->i_lock);
2379 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
2380 if (end_pos > nfsi->layout->plh_lwb)
2381 nfsi->layout->plh_lwb = end_pos;
2387 status = nfs4_proc_layoutcommit(data, sync);
2390 mark_inode_dirty_sync(inode);
2391 dprintk("<-- %s status %d\n", __func__, status);
2394 spin_unlock(&inode->i_lock);
2396 clear_layoutcommitting:
2397 pnfs_clear_layoutcommitting(inode);
2400 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
2403 pnfs_generic_sync(struct inode *inode, bool datasync)
2405 return pnfs_layoutcommit_inode(inode, true);
2407 EXPORT_SYMBOL_GPL(pnfs_generic_sync);
2409 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
2411 struct nfs4_threshold *thp;
2413 thp = kzalloc(sizeof(*thp), GFP_NOFS);
2415 dprintk("%s mdsthreshold allocation failed\n", __func__);
2421 #if IS_ENABLED(CONFIG_NFS_V4_2)
2423 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
2425 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2426 struct nfs_server *server = NFS_SERVER(inode);
2427 struct nfs_inode *nfsi = NFS_I(inode);
2428 struct nfs42_layoutstat_data *data;
2429 struct pnfs_layout_hdr *hdr;
2432 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
2435 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
2438 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
2441 spin_lock(&inode->i_lock);
2442 if (!NFS_I(inode)->layout) {
2443 spin_unlock(&inode->i_lock);
2444 goto out_clear_layoutstats;
2446 hdr = NFS_I(inode)->layout;
2447 pnfs_get_layout_hdr(hdr);
2448 spin_unlock(&inode->i_lock);
2450 data = kzalloc(sizeof(*data), gfp_flags);
2456 data->args.fh = NFS_FH(inode);
2457 data->args.inode = inode;
2458 nfs4_stateid_copy(&data->args.stateid, &hdr->plh_stateid);
2459 status = ld->prepare_layoutstats(&data->args);
2463 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
2466 dprintk("%s returns %d\n", __func__, status);
2472 pnfs_put_layout_hdr(hdr);
2473 out_clear_layoutstats:
2474 smp_mb__before_atomic();
2475 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
2476 smp_mb__after_atomic();
2479 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
2482 unsigned int layoutstats_timer;
2483 module_param(layoutstats_timer, uint, 0644);
2484 EXPORT_SYMBOL_GPL(layoutstats_timer);