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);
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);
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))
525 /* Returns count of number of matching invalid lsegs remaining in list
529 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
530 struct list_head *tmp_list,
531 const struct pnfs_layout_range *recall_range)
533 struct pnfs_layout_segment *lseg, *next;
536 dprintk("%s:Begin lo %p\n", __func__, lo);
538 if (list_empty(&lo->plh_segs))
540 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
542 should_free_lseg(&lseg->pls_range, recall_range)) {
543 dprintk("%s: freeing lseg %p iomode %d "
544 "offset %llu length %llu\n", __func__,
545 lseg, lseg->pls_range.iomode, lseg->pls_range.offset,
546 lseg->pls_range.length);
547 if (!mark_lseg_invalid(lseg, tmp_list))
550 dprintk("%s:Return %i\n", __func__, remaining);
554 /* note free_me must contain lsegs from a single layout_hdr */
556 pnfs_free_lseg_list(struct list_head *free_me)
558 struct pnfs_layout_segment *lseg, *tmp;
560 if (list_empty(free_me))
563 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
564 list_del(&lseg->pls_list);
565 pnfs_free_lseg(lseg);
570 pnfs_destroy_layout(struct nfs_inode *nfsi)
572 struct pnfs_layout_hdr *lo;
575 spin_lock(&nfsi->vfs_inode.i_lock);
578 pnfs_get_layout_hdr(lo);
579 pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
580 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
581 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
582 spin_unlock(&nfsi->vfs_inode.i_lock);
583 pnfs_free_lseg_list(&tmp_list);
584 pnfs_put_layout_hdr(lo);
586 spin_unlock(&nfsi->vfs_inode.i_lock);
588 EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
591 pnfs_layout_add_bulk_destroy_list(struct inode *inode,
592 struct list_head *layout_list)
594 struct pnfs_layout_hdr *lo;
597 spin_lock(&inode->i_lock);
598 lo = NFS_I(inode)->layout;
599 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
600 pnfs_get_layout_hdr(lo);
601 list_add(&lo->plh_bulk_destroy, layout_list);
604 spin_unlock(&inode->i_lock);
608 /* Caller must hold rcu_read_lock and clp->cl_lock */
610 pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
611 struct nfs_server *server,
612 struct list_head *layout_list)
614 struct pnfs_layout_hdr *lo, *next;
617 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
618 inode = igrab(lo->plh_inode);
621 list_del_init(&lo->plh_layouts);
622 if (pnfs_layout_add_bulk_destroy_list(inode, layout_list))
625 spin_unlock(&clp->cl_lock);
627 spin_lock(&clp->cl_lock);
635 pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
638 struct pnfs_layout_hdr *lo;
640 LIST_HEAD(lseg_list);
643 while (!list_empty(layout_list)) {
644 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
646 dprintk("%s freeing layout for inode %lu\n", __func__,
647 lo->plh_inode->i_ino);
648 inode = lo->plh_inode;
650 pnfs_layoutcommit_inode(inode, false);
652 spin_lock(&inode->i_lock);
653 list_del_init(&lo->plh_bulk_destroy);
654 if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
656 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
659 spin_unlock(&inode->i_lock);
660 pnfs_free_lseg_list(&lseg_list);
661 /* Free all lsegs that are attached to commit buckets */
662 nfs_commit_inode(inode, 0);
663 pnfs_put_layout_hdr(lo);
670 pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
671 struct nfs_fsid *fsid,
674 struct nfs_server *server;
675 LIST_HEAD(layout_list);
677 spin_lock(&clp->cl_lock);
680 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
681 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
683 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
689 spin_unlock(&clp->cl_lock);
691 if (list_empty(&layout_list))
693 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
697 pnfs_destroy_layouts_byclid(struct nfs_client *clp,
700 struct nfs_server *server;
701 LIST_HEAD(layout_list);
703 spin_lock(&clp->cl_lock);
706 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
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 * Called by the state manger to remove all layouts established under an
725 pnfs_destroy_all_layouts(struct nfs_client *clp)
727 nfs4_deviceid_mark_client_invalid(clp);
728 nfs4_deviceid_purge_client(clp);
730 pnfs_destroy_layouts_byclid(clp, false);
734 * Compare 2 layout stateid sequence ids, to see which is newer,
735 * taking into account wraparound issues.
737 static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
739 return (s32)(s1 - s2) > 0;
742 /* update lo->plh_stateid with new if is more recent */
744 pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
747 u32 oldseq, newseq, new_barrier;
748 int empty = list_empty(&lo->plh_segs);
750 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
751 newseq = be32_to_cpu(new->seqid);
752 if (empty || pnfs_seqid_is_newer(newseq, oldseq)) {
753 nfs4_stateid_copy(&lo->plh_stateid, new);
754 if (update_barrier) {
755 new_barrier = be32_to_cpu(new->seqid);
757 /* Because of wraparound, we want to keep the barrier
758 * "close" to the current seqids.
760 new_barrier = newseq - atomic_read(&lo->plh_outstanding);
762 if (empty || pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
763 lo->plh_barrier = new_barrier;
768 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
769 const nfs4_stateid *stateid)
771 u32 seqid = be32_to_cpu(stateid->seqid);
773 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
776 /* lget is set to 1 if called from inside send_layoutget call chain */
778 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
780 return lo->plh_block_lgets ||
781 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
785 pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
786 const struct pnfs_layout_range *range,
787 struct nfs4_state *open_state)
791 dprintk("--> %s\n", __func__);
792 spin_lock(&lo->plh_inode->i_lock);
793 if (pnfs_layoutgets_blocked(lo)) {
795 } else if (!nfs4_valid_open_stateid(open_state)) {
797 } else if (list_empty(&lo->plh_segs) ||
798 test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
802 seq = read_seqbegin(&open_state->seqlock);
803 nfs4_stateid_copy(dst, &open_state->stateid);
804 } while (read_seqretry(&open_state->seqlock, seq));
806 nfs4_stateid_copy(dst, &lo->plh_stateid);
807 spin_unlock(&lo->plh_inode->i_lock);
808 dprintk("<-- %s\n", __func__);
813 * Get layout from server.
814 * for now, assume that whole file layouts are requested.
816 * arg->length: all ones
818 static struct pnfs_layout_segment *
819 send_layoutget(struct pnfs_layout_hdr *lo,
820 struct nfs_open_context *ctx,
821 const struct pnfs_layout_range *range,
824 struct inode *ino = lo->plh_inode;
825 struct nfs_server *server = NFS_SERVER(ino);
826 struct nfs4_layoutget *lgp;
827 struct pnfs_layout_segment *lseg;
830 dprintk("--> %s\n", __func__);
833 * Synchronously retrieve layout information from server and
834 * store in lseg. If we race with a concurrent seqid morphing
835 * op, then re-send the LAYOUTGET.
838 lgp = kzalloc(sizeof(*lgp), gfp_flags);
842 i_size = i_size_read(ino);
844 lgp->args.minlength = PAGE_SIZE;
845 if (lgp->args.minlength > range->length)
846 lgp->args.minlength = range->length;
847 if (range->iomode == IOMODE_READ) {
848 if (range->offset >= i_size)
849 lgp->args.minlength = 0;
850 else if (i_size - range->offset < lgp->args.minlength)
851 lgp->args.minlength = i_size - range->offset;
853 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
854 pnfs_copy_range(&lgp->args.range, range);
855 lgp->args.type = server->pnfs_curr_ld->id;
856 lgp->args.inode = ino;
857 lgp->args.ctx = get_nfs_open_context(ctx);
858 lgp->gfp_flags = gfp_flags;
859 lgp->cred = lo->plh_lc_cred;
861 lseg = nfs4_proc_layoutget(lgp, gfp_flags);
862 } while (lseg == ERR_PTR(-EAGAIN));
864 if (IS_ERR(lseg) && !nfs_error_is_fatal(PTR_ERR(lseg)))
867 pnfs_layout_clear_fail_bit(lo,
868 pnfs_iomode_to_fail_bit(range->iomode));
873 static void pnfs_clear_layoutcommit(struct inode *inode,
874 struct list_head *head)
876 struct nfs_inode *nfsi = NFS_I(inode);
877 struct pnfs_layout_segment *lseg, *tmp;
879 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
881 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
882 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
884 pnfs_lseg_dec_and_remove_zero(lseg, head);
888 void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
890 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
891 smp_mb__after_atomic();
892 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
893 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
897 pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo)
899 if (test_and_set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
901 lo->plh_return_iomode = 0;
902 lo->plh_return_seq = 0;
903 pnfs_get_layout_hdr(lo);
904 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
909 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, const nfs4_stateid *stateid,
910 enum pnfs_iomode iomode, bool sync)
912 struct inode *ino = lo->plh_inode;
913 struct nfs4_layoutreturn *lrp;
916 lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
917 if (unlikely(lrp == NULL)) {
919 spin_lock(&ino->i_lock);
920 pnfs_clear_layoutreturn_waitbit(lo);
921 spin_unlock(&ino->i_lock);
922 pnfs_put_layout_hdr(lo);
926 nfs4_stateid_copy(&lrp->args.stateid, stateid);
927 lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id;
928 lrp->args.inode = ino;
929 lrp->args.range.iomode = iomode;
930 lrp->args.range.offset = 0;
931 lrp->args.range.length = NFS4_MAX_UINT64;
932 lrp->args.layout = lo;
933 lrp->clp = NFS_SERVER(ino)->nfs_client;
934 lrp->cred = lo->plh_lc_cred;
936 status = nfs4_proc_layoutreturn(lrp, sync);
938 dprintk("<-- %s status: %d\n", __func__, status);
942 /* Return true if layoutreturn is needed */
944 pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
946 struct pnfs_layout_segment *s;
948 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
951 /* Defer layoutreturn until all lsegs are done */
952 list_for_each_entry(s, &lo->plh_segs, pls_list) {
953 if (test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags))
960 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo)
962 struct inode *inode= lo->plh_inode;
964 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
966 spin_lock(&inode->i_lock);
967 if (pnfs_layout_need_return(lo)) {
968 nfs4_stateid stateid;
969 enum pnfs_iomode iomode;
972 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
973 stateid.seqid = cpu_to_be32(lo->plh_return_seq);
974 iomode = lo->plh_return_iomode;
975 send = pnfs_prepare_layoutreturn(lo);
976 spin_unlock(&inode->i_lock);
978 /* Send an async layoutreturn so we dont deadlock */
979 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
982 spin_unlock(&inode->i_lock);
986 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
987 * when the layout segment list is empty.
989 * Note that a pnfs_layout_hdr can exist with an empty layout segment
990 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
991 * deviceid is marked invalid.
994 _pnfs_return_layout(struct inode *ino)
996 struct pnfs_layout_hdr *lo = NULL;
997 struct nfs_inode *nfsi = NFS_I(ino);
999 nfs4_stateid stateid;
1000 int status = 0, empty;
1003 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
1005 spin_lock(&ino->i_lock);
1008 spin_unlock(&ino->i_lock);
1009 dprintk("NFS: %s no layout to return\n", __func__);
1012 nfs4_stateid_copy(&stateid, &nfsi->layout->plh_stateid);
1013 /* Reference matched in nfs4_layoutreturn_release */
1014 pnfs_get_layout_hdr(lo);
1015 empty = list_empty(&lo->plh_segs);
1016 pnfs_clear_layoutcommit(ino, &tmp_list);
1017 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
1019 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
1020 struct pnfs_layout_range range = {
1021 .iomode = IOMODE_ANY,
1023 .length = NFS4_MAX_UINT64,
1025 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
1028 /* Don't send a LAYOUTRETURN if list was initially empty */
1030 spin_unlock(&ino->i_lock);
1031 dprintk("NFS: %s no layout segments to return\n", __func__);
1032 goto out_put_layout_hdr;
1035 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
1036 send = pnfs_prepare_layoutreturn(lo);
1037 spin_unlock(&ino->i_lock);
1038 pnfs_free_lseg_list(&tmp_list);
1040 status = pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true);
1042 pnfs_put_layout_hdr(lo);
1044 dprintk("<-- %s status: %d\n", __func__, status);
1047 EXPORT_SYMBOL_GPL(_pnfs_return_layout);
1050 pnfs_commit_and_return_layout(struct inode *inode)
1052 struct pnfs_layout_hdr *lo;
1055 spin_lock(&inode->i_lock);
1056 lo = NFS_I(inode)->layout;
1058 spin_unlock(&inode->i_lock);
1061 pnfs_get_layout_hdr(lo);
1062 /* Block new layoutgets and read/write to ds */
1063 lo->plh_block_lgets++;
1064 spin_unlock(&inode->i_lock);
1065 filemap_fdatawait(inode->i_mapping);
1066 ret = pnfs_layoutcommit_inode(inode, true);
1068 ret = _pnfs_return_layout(inode);
1069 spin_lock(&inode->i_lock);
1070 lo->plh_block_lgets--;
1071 spin_unlock(&inode->i_lock);
1072 pnfs_put_layout_hdr(lo);
1076 bool pnfs_roc(struct inode *ino)
1078 struct nfs_inode *nfsi = NFS_I(ino);
1079 struct nfs_open_context *ctx;
1080 struct nfs4_state *state;
1081 struct pnfs_layout_hdr *lo;
1082 struct pnfs_layout_segment *lseg, *tmp;
1083 nfs4_stateid stateid;
1084 LIST_HEAD(tmp_list);
1085 bool found = false, layoutreturn = false, roc = false;
1087 spin_lock(&ino->i_lock);
1089 if (!lo || test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
1092 /* no roc if we hold a delegation */
1093 if (nfs4_check_delegation(ino, FMODE_READ))
1096 list_for_each_entry(ctx, &nfsi->open_files, list) {
1098 /* Don't return layout if there is open file state */
1099 if (state != NULL && state->state != 0)
1103 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
1104 /* always send layoutreturn if being marked so */
1105 if (test_and_clear_bit(NFS_LAYOUT_RETURN_REQUESTED,
1107 layoutreturn = pnfs_prepare_layoutreturn(lo);
1109 list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
1110 /* If we are sending layoutreturn, invalidate all valid lsegs */
1111 if (layoutreturn || test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
1112 mark_lseg_invalid(lseg, &tmp_list);
1115 /* ROC in two conditions:
1116 * 1. there are ROC lsegs
1117 * 2. we don't send layoutreturn
1119 if (found && !layoutreturn) {
1120 /* lo ref dropped in pnfs_roc_release() */
1121 pnfs_get_layout_hdr(lo);
1126 spin_unlock(&ino->i_lock);
1127 pnfs_free_lseg_list(&tmp_list);
1128 pnfs_layoutcommit_inode(ino, true);
1130 pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true);
1134 void pnfs_roc_release(struct inode *ino)
1136 struct pnfs_layout_hdr *lo;
1138 spin_lock(&ino->i_lock);
1139 lo = NFS_I(ino)->layout;
1140 pnfs_clear_layoutreturn_waitbit(lo);
1141 if (atomic_dec_and_test(&lo->plh_refcount)) {
1142 pnfs_detach_layout_hdr(lo);
1143 spin_unlock(&ino->i_lock);
1144 pnfs_free_layout_hdr(lo);
1146 spin_unlock(&ino->i_lock);
1149 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
1151 struct pnfs_layout_hdr *lo;
1153 spin_lock(&ino->i_lock);
1154 lo = NFS_I(ino)->layout;
1155 pnfs_mark_layout_returned_if_empty(lo);
1156 if (pnfs_seqid_is_newer(barrier, lo->plh_barrier))
1157 lo->plh_barrier = barrier;
1158 spin_unlock(&ino->i_lock);
1159 trace_nfs4_layoutreturn_on_close(ino, 0);
1162 void pnfs_roc_get_barrier(struct inode *ino, u32 *barrier)
1164 struct nfs_inode *nfsi = NFS_I(ino);
1165 struct pnfs_layout_hdr *lo;
1168 spin_lock(&ino->i_lock);
1170 current_seqid = be32_to_cpu(lo->plh_stateid.seqid);
1172 /* Since close does not return a layout stateid for use as
1173 * a barrier, we choose the worst-case barrier.
1175 *barrier = current_seqid + atomic_read(&lo->plh_outstanding);
1176 spin_unlock(&ino->i_lock);
1179 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1181 struct nfs_inode *nfsi = NFS_I(ino);
1182 struct pnfs_layout_hdr *lo;
1185 /* we might not have grabbed lo reference. so need to check under
1187 spin_lock(&ino->i_lock);
1189 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
1191 spin_unlock(&ino->i_lock);
1194 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
1200 * Compare two layout segments for sorting into layout cache.
1201 * We want to preferentially return RW over RO layouts, so ensure those
1205 pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1206 const struct pnfs_layout_range *l2)
1210 /* high offset > low offset */
1211 d = l1->offset - l2->offset;
1215 /* short length > long length */
1216 d = l2->length - l1->length;
1220 /* read > read/write */
1221 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1225 pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1226 const struct pnfs_layout_range *l2)
1228 return pnfs_lseg_range_cmp(l1, l2) > 0;
1232 pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1233 struct pnfs_layout_segment *old)
1239 pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1240 struct pnfs_layout_segment *lseg,
1241 bool (*is_after)(const struct pnfs_layout_range *,
1242 const struct pnfs_layout_range *),
1243 bool (*do_merge)(struct pnfs_layout_segment *,
1244 struct pnfs_layout_segment *),
1245 struct list_head *free_me)
1247 struct pnfs_layout_segment *lp, *tmp;
1249 dprintk("%s:Begin\n", __func__);
1251 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1252 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1254 if (do_merge(lseg, lp)) {
1255 mark_lseg_invalid(lp, free_me);
1258 if (is_after(&lseg->pls_range, &lp->pls_range))
1260 list_add_tail(&lseg->pls_list, &lp->pls_list);
1261 dprintk("%s: inserted lseg %p "
1262 "iomode %d offset %llu length %llu before "
1263 "lp %p iomode %d offset %llu length %llu\n",
1264 __func__, lseg, lseg->pls_range.iomode,
1265 lseg->pls_range.offset, lseg->pls_range.length,
1266 lp, lp->pls_range.iomode, lp->pls_range.offset,
1267 lp->pls_range.length);
1270 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1271 dprintk("%s: inserted lseg %p "
1272 "iomode %d offset %llu length %llu at tail\n",
1273 __func__, lseg, lseg->pls_range.iomode,
1274 lseg->pls_range.offset, lseg->pls_range.length);
1276 pnfs_get_layout_hdr(lo);
1278 dprintk("%s:Return\n", __func__);
1280 EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1283 pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1284 struct pnfs_layout_segment *lseg,
1285 struct list_head *free_me)
1287 struct inode *inode = lo->plh_inode;
1288 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1290 if (ld->add_lseg != NULL)
1291 ld->add_lseg(lo, lseg, free_me);
1293 pnfs_generic_layout_insert_lseg(lo, lseg,
1294 pnfs_lseg_range_is_after,
1299 static struct pnfs_layout_hdr *
1300 alloc_init_layout_hdr(struct inode *ino,
1301 struct nfs_open_context *ctx,
1304 struct pnfs_layout_hdr *lo;
1306 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1309 atomic_set(&lo->plh_refcount, 1);
1310 INIT_LIST_HEAD(&lo->plh_layouts);
1311 INIT_LIST_HEAD(&lo->plh_segs);
1312 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1313 lo->plh_inode = ino;
1314 lo->plh_lc_cred = get_rpccred(ctx->cred);
1318 static struct pnfs_layout_hdr *
1319 pnfs_find_alloc_layout(struct inode *ino,
1320 struct nfs_open_context *ctx,
1323 struct nfs_inode *nfsi = NFS_I(ino);
1324 struct pnfs_layout_hdr *new = NULL;
1326 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1328 if (nfsi->layout != NULL)
1330 spin_unlock(&ino->i_lock);
1331 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1332 spin_lock(&ino->i_lock);
1334 if (likely(nfsi->layout == NULL)) { /* Won the race? */
1337 } else if (new != NULL)
1338 pnfs_free_layout_hdr(new);
1340 pnfs_get_layout_hdr(nfsi->layout);
1341 return nfsi->layout;
1345 * iomode matching rules:
1356 pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1357 const struct pnfs_layout_range *range)
1359 struct pnfs_layout_range range1;
1361 if ((range->iomode == IOMODE_RW &&
1362 ls_range->iomode != IOMODE_RW) ||
1363 !pnfs_lseg_range_intersecting(ls_range, range))
1366 /* range1 covers only the first byte in the range */
1369 return pnfs_lseg_range_contained(ls_range, &range1);
1373 * lookup range in layout
1375 static struct pnfs_layout_segment *
1376 pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1377 struct pnfs_layout_range *range)
1379 struct pnfs_layout_segment *lseg, *ret = NULL;
1381 dprintk("%s:Begin\n", __func__);
1383 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1384 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1385 !test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
1386 pnfs_lseg_range_match(&lseg->pls_range, range)) {
1387 ret = pnfs_get_lseg(lseg);
1392 dprintk("%s:Return lseg %p ref %d\n",
1393 __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
1398 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1399 * to the MDS or over pNFS
1401 * The nfs_inode read_io and write_io fields are cumulative counters reset
1402 * when there are no layout segments. Note that in pnfs_update_layout iomode
1403 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1406 * A return of true means use MDS I/O.
1409 * If a file's size is smaller than the file size threshold, data accesses
1410 * SHOULD be sent to the metadata server. If an I/O request has a length that
1411 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1412 * server. If both file size and I/O size are provided, the client SHOULD
1413 * reach or exceed both thresholds before sending its read or write
1414 * requests to the data server.
1416 static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1417 struct inode *ino, int iomode)
1419 struct nfs4_threshold *t = ctx->mdsthreshold;
1420 struct nfs_inode *nfsi = NFS_I(ino);
1421 loff_t fsize = i_size_read(ino);
1422 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1427 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1428 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1432 if (t->bm & THRESHOLD_RD) {
1433 dprintk("%s fsize %llu\n", __func__, fsize);
1435 if (fsize < t->rd_sz)
1438 if (t->bm & THRESHOLD_RD_IO) {
1439 dprintk("%s nfsi->read_io %llu\n", __func__,
1442 if (nfsi->read_io < t->rd_io_sz)
1447 if (t->bm & THRESHOLD_WR) {
1448 dprintk("%s fsize %llu\n", __func__, fsize);
1450 if (fsize < t->wr_sz)
1453 if (t->bm & THRESHOLD_WR_IO) {
1454 dprintk("%s nfsi->write_io %llu\n", __func__,
1457 if (nfsi->write_io < t->wr_io_sz)
1462 if (size_set && io_set) {
1465 } else if (size || io)
1468 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1472 static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
1475 * send layoutcommit as it can hold up layoutreturn due to lseg
1478 pnfs_layoutcommit_inode(lo->plh_inode, false);
1479 return !wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
1480 nfs_wait_bit_killable,
1481 TASK_UNINTERRUPTIBLE);
1484 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1486 unsigned long *bitlock = &lo->plh_flags;
1488 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1489 smp_mb__after_atomic();
1490 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1494 * Layout segment is retreived from the server if not cached.
1495 * The appropriate layout segment is referenced and returned to the caller.
1497 struct pnfs_layout_segment *
1498 pnfs_update_layout(struct inode *ino,
1499 struct nfs_open_context *ctx,
1502 enum pnfs_iomode iomode,
1505 struct pnfs_layout_range arg = {
1511 struct nfs_server *server = NFS_SERVER(ino);
1512 struct nfs_client *clp = server->nfs_client;
1513 struct pnfs_layout_hdr *lo;
1514 struct pnfs_layout_segment *lseg = NULL;
1517 if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
1518 trace_pnfs_update_layout(ino, pos, count, iomode, NULL,
1519 PNFS_UPDATE_LAYOUT_NO_PNFS);
1523 if (iomode == IOMODE_READ && i_size_read(ino) == 0) {
1524 trace_pnfs_update_layout(ino, pos, count, iomode, NULL,
1525 PNFS_UPDATE_LAYOUT_RD_ZEROLEN);
1529 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
1530 trace_pnfs_update_layout(ino, pos, count, iomode, NULL,
1531 PNFS_UPDATE_LAYOUT_MDSTHRESH);
1537 spin_lock(&ino->i_lock);
1538 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1540 spin_unlock(&ino->i_lock);
1541 trace_pnfs_update_layout(ino, pos, count, iomode, NULL,
1542 PNFS_UPDATE_LAYOUT_NOMEM);
1546 /* Do we even need to bother with this? */
1547 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1548 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1549 PNFS_UPDATE_LAYOUT_BULK_RECALL);
1550 dprintk("%s matches recall, use MDS\n", __func__);
1554 /* if LAYOUTGET already failed once we don't try again */
1555 if (pnfs_layout_io_test_failed(lo, iomode)) {
1556 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1557 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
1561 first = list_empty(&lo->plh_segs);
1563 /* The first layoutget for the file. Need to serialize per
1564 * RFC 5661 Errata 3208.
1566 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
1568 spin_unlock(&ino->i_lock);
1569 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_FIRST_LAYOUTGET,
1570 TASK_UNINTERRUPTIBLE);
1571 pnfs_put_layout_hdr(lo);
1575 /* Check to see if the layout for the given range
1578 lseg = pnfs_find_lseg(lo, &arg);
1580 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1581 PNFS_UPDATE_LAYOUT_FOUND_CACHED);
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__);
1600 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1601 PNFS_UPDATE_LAYOUT_RETURN);
1602 goto out_put_layout_hdr;
1605 if (pnfs_layoutgets_blocked(lo)) {
1606 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1607 PNFS_UPDATE_LAYOUT_BLOCKED);
1610 atomic_inc(&lo->plh_outstanding);
1611 spin_unlock(&ino->i_lock);
1613 if (list_empty(&lo->plh_layouts)) {
1614 /* The lo must be on the clp list if there is any
1615 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1617 spin_lock(&clp->cl_lock);
1618 if (list_empty(&lo->plh_layouts))
1619 list_add_tail(&lo->plh_layouts, &server->layouts);
1620 spin_unlock(&clp->cl_lock);
1623 pg_offset = arg.offset & ~PAGE_MASK;
1625 arg.offset -= pg_offset;
1626 arg.length += pg_offset;
1628 if (arg.length != NFS4_MAX_UINT64)
1629 arg.length = PAGE_ALIGN(arg.length);
1631 lseg = send_layoutget(lo, ctx, &arg, gfp_flags);
1632 atomic_dec(&lo->plh_outstanding);
1633 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1634 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
1637 pnfs_clear_first_layoutget(lo);
1638 pnfs_put_layout_hdr(lo);
1640 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1641 "(%s, offset: %llu, length: %llu)\n",
1642 __func__, ino->i_sb->s_id,
1643 (unsigned long long)NFS_FILEID(ino),
1644 IS_ERR_OR_NULL(lseg) ? "not found" : "found",
1645 iomode==IOMODE_RW ? "read/write" : "read-only",
1646 (unsigned long long)pos,
1647 (unsigned long long)count);
1650 spin_unlock(&ino->i_lock);
1651 goto out_put_layout_hdr;
1653 EXPORT_SYMBOL_GPL(pnfs_update_layout);
1656 pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
1658 switch (range->iomode) {
1665 if (range->offset == NFS4_MAX_UINT64)
1667 if (range->length == 0)
1669 if (range->length != NFS4_MAX_UINT64 &&
1670 range->length > NFS4_MAX_UINT64 - range->offset)
1675 struct pnfs_layout_segment *
1676 pnfs_layout_process(struct nfs4_layoutget *lgp)
1678 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
1679 struct nfs4_layoutget_res *res = &lgp->res;
1680 struct pnfs_layout_segment *lseg;
1681 struct inode *ino = lo->plh_inode;
1683 int status = -EINVAL;
1685 if (!pnfs_sanity_check_layout_range(&res->range))
1688 /* Inject layout blob into I/O device driver */
1689 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1690 if (!lseg || IS_ERR(lseg)) {
1694 status = PTR_ERR(lseg);
1695 dprintk("%s: Could not allocate layout: error %d\n",
1700 init_lseg(lo, lseg);
1701 lseg->pls_range = res->range;
1702 lseg->pls_seq = be32_to_cpu(res->stateid.seqid);
1704 spin_lock(&ino->i_lock);
1705 if (pnfs_layoutgets_blocked(lo)) {
1706 dprintk("%s forget reply due to state\n", __func__);
1707 goto out_forget_reply;
1710 if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
1711 /* existing state ID, make sure the sequence number matches. */
1712 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
1713 dprintk("%s forget reply due to sequence\n", __func__);
1715 goto out_forget_reply;
1717 pnfs_set_layout_stateid(lo, &res->stateid, false);
1720 * We got an entirely new state ID. Mark all segments for the
1721 * inode invalid, and don't bother validating the stateid
1724 pnfs_mark_matching_lsegs_invalid(lo, &free_me, NULL);
1726 nfs4_stateid_copy(&lo->plh_stateid, &res->stateid);
1727 lo->plh_barrier = be32_to_cpu(res->stateid.seqid);
1730 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
1732 pnfs_get_lseg(lseg);
1733 pnfs_layout_insert_lseg(lo, lseg, &free_me);
1735 if (res->return_on_close)
1736 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
1738 spin_unlock(&ino->i_lock);
1739 pnfs_free_lseg_list(&free_me);
1742 return ERR_PTR(status);
1745 spin_unlock(&ino->i_lock);
1746 lseg->pls_layout = lo;
1747 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1752 pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
1755 if (lo->plh_return_iomode == iomode)
1757 if (lo->plh_return_iomode != 0)
1758 iomode = IOMODE_ANY;
1759 lo->plh_return_iomode = iomode;
1760 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
1761 if (!lo->plh_return_seq || pnfs_seqid_is_newer(seq, lo->plh_return_seq))
1762 lo->plh_return_seq = seq;
1766 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
1767 * @lo: pointer to layout header
1768 * @tmp_list: list header to be used with pnfs_free_lseg_list()
1769 * @return_range: describe layout segment ranges to be returned
1771 * This function is mainly intended for use by layoutrecall. It attempts
1772 * to free the layout segment immediately, or else to mark it for return
1773 * as soon as its reference count drops to zero.
1776 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
1777 struct list_head *tmp_list,
1778 const struct pnfs_layout_range *return_range)
1780 struct pnfs_layout_segment *lseg, *next;
1783 dprintk("%s:Begin lo %p\n", __func__, lo);
1785 if (list_empty(&lo->plh_segs))
1788 assert_spin_locked(&lo->plh_inode->i_lock);
1790 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
1791 if (should_free_lseg(&lseg->pls_range, return_range)) {
1792 dprintk("%s: marking lseg %p iomode %d "
1793 "offset %llu length %llu\n", __func__,
1794 lseg, lseg->pls_range.iomode,
1795 lseg->pls_range.offset,
1796 lseg->pls_range.length);
1797 if (mark_lseg_invalid(lseg, tmp_list))
1800 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1801 pnfs_set_plh_return_info(lo, return_range->iomode, lseg->pls_seq);
1806 void pnfs_error_mark_layout_for_return(struct inode *inode,
1807 struct pnfs_layout_segment *lseg)
1809 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
1810 struct pnfs_layout_range range = {
1811 .iomode = lseg->pls_range.iomode,
1813 .length = NFS4_MAX_UINT64,
1816 bool return_now = false;
1818 spin_lock(&inode->i_lock);
1819 pnfs_set_plh_return_info(lo, range.iomode, lseg->pls_seq);
1821 * mark all matching lsegs so that we are sure to have no live
1822 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
1825 if (!pnfs_mark_matching_lsegs_return(lo, &free_me, &range)) {
1826 nfs4_stateid stateid;
1827 enum pnfs_iomode iomode = lo->plh_return_iomode;
1829 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
1830 return_now = pnfs_prepare_layoutreturn(lo);
1831 spin_unlock(&inode->i_lock);
1833 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
1835 spin_unlock(&inode->i_lock);
1836 nfs_commit_inode(inode, 0);
1838 pnfs_free_lseg_list(&free_me);
1840 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
1843 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1845 u64 rd_size = req->wb_bytes;
1847 if (pgio->pg_lseg == NULL) {
1848 if (pgio->pg_dreq == NULL)
1849 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
1851 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
1853 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1859 if (IS_ERR(pgio->pg_lseg)) {
1860 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
1861 pgio->pg_lseg = NULL;
1865 /* If no lseg, fall back to read through mds */
1866 if (pgio->pg_lseg == NULL)
1867 nfs_pageio_reset_read_mds(pgio);
1870 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
1873 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
1874 struct nfs_page *req, u64 wb_size)
1876 if (pgio->pg_lseg == NULL) {
1877 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1883 if (IS_ERR(pgio->pg_lseg)) {
1884 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
1885 pgio->pg_lseg = NULL;
1889 /* If no lseg, fall back to write through mds */
1890 if (pgio->pg_lseg == NULL)
1891 nfs_pageio_reset_write_mds(pgio);
1893 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
1896 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
1898 if (desc->pg_lseg) {
1899 pnfs_put_lseg(desc->pg_lseg);
1900 desc->pg_lseg = NULL;
1903 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
1906 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
1907 * of bytes (maximum @req->wb_bytes) that can be coalesced.
1910 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
1911 struct nfs_page *prev, struct nfs_page *req)
1914 u64 seg_end, req_start, seg_left;
1916 size = nfs_generic_pg_test(pgio, prev, req);
1921 * 'size' contains the number of bytes left in the current page (up
1922 * to the original size asked for in @req->wb_bytes).
1924 * Calculate how many bytes are left in the layout segment
1925 * and if there are less bytes than 'size', return that instead.
1927 * Please also note that 'end_offset' is actually the offset of the
1928 * first byte that lies outside the pnfs_layout_range. FIXME?
1931 if (pgio->pg_lseg) {
1932 seg_end = end_offset(pgio->pg_lseg->pls_range.offset,
1933 pgio->pg_lseg->pls_range.length);
1934 req_start = req_offset(req);
1935 WARN_ON_ONCE(req_start >= seg_end);
1936 /* start of request is past the last byte of this segment */
1937 if (req_start >= seg_end) {
1938 /* reference the new lseg */
1939 if (pgio->pg_ops->pg_cleanup)
1940 pgio->pg_ops->pg_cleanup(pgio);
1941 if (pgio->pg_ops->pg_init)
1942 pgio->pg_ops->pg_init(pgio, req);
1946 /* adjust 'size' iff there are fewer bytes left in the
1947 * segment than what nfs_generic_pg_test returned */
1948 seg_left = seg_end - req_start;
1949 if (seg_left < size)
1950 size = (unsigned int)seg_left;
1955 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
1957 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
1959 struct nfs_pageio_descriptor pgio;
1961 /* Resend all requests through the MDS */
1962 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
1963 hdr->completion_ops);
1964 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
1965 return nfs_pageio_resend(&pgio, hdr);
1967 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
1969 static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
1972 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
1973 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1974 PNFS_LAYOUTRET_ON_ERROR) {
1975 pnfs_return_layout(hdr->inode);
1977 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
1978 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
1982 * Called by non rpc-based layout drivers
1984 void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
1986 if (likely(!hdr->pnfs_error)) {
1987 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
1988 hdr->mds_offset + hdr->res.count);
1989 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
1991 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
1992 if (unlikely(hdr->pnfs_error))
1993 pnfs_ld_handle_write_error(hdr);
1994 hdr->mds_ops->rpc_release(hdr);
1996 EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
1999 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
2000 struct nfs_pgio_header *hdr)
2002 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2004 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2005 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2006 nfs_pageio_reset_write_mds(desc);
2007 mirror->pg_recoalesce = 1;
2009 nfs_pgio_data_destroy(hdr);
2013 static enum pnfs_try_status
2014 pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
2015 const struct rpc_call_ops *call_ops,
2016 struct pnfs_layout_segment *lseg,
2019 struct inode *inode = hdr->inode;
2020 enum pnfs_try_status trypnfs;
2021 struct nfs_server *nfss = NFS_SERVER(inode);
2023 hdr->mds_ops = call_ops;
2025 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
2026 inode->i_ino, hdr->args.count, hdr->args.offset, how);
2027 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
2028 if (trypnfs != PNFS_NOT_ATTEMPTED)
2029 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
2030 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2035 pnfs_do_write(struct nfs_pageio_descriptor *desc,
2036 struct nfs_pgio_header *hdr, int how)
2038 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2039 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2040 enum pnfs_try_status trypnfs;
2042 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
2043 if (trypnfs == PNFS_NOT_ATTEMPTED)
2044 pnfs_write_through_mds(desc, hdr);
2047 static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
2049 pnfs_put_lseg(hdr->lseg);
2050 nfs_pgio_header_free(hdr);
2054 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
2056 struct nfs_pgio_header *hdr;
2059 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2061 desc->pg_error = -ENOMEM;
2062 return desc->pg_error;
2064 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
2066 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2067 ret = nfs_generic_pgio(desc, hdr);
2069 pnfs_do_write(desc, hdr, desc->pg_ioflags);
2073 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
2075 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
2077 struct nfs_pageio_descriptor pgio;
2079 /* Resend all requests through the MDS */
2080 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
2081 return nfs_pageio_resend(&pgio, hdr);
2083 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
2085 static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
2087 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
2088 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2089 PNFS_LAYOUTRET_ON_ERROR) {
2090 pnfs_return_layout(hdr->inode);
2092 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2093 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2097 * Called by non rpc-based layout drivers
2099 void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2101 if (likely(!hdr->pnfs_error)) {
2102 __nfs4_read_done_cb(hdr);
2103 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2105 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2106 if (unlikely(hdr->pnfs_error))
2107 pnfs_ld_handle_read_error(hdr);
2108 hdr->mds_ops->rpc_release(hdr);
2110 EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
2113 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2114 struct nfs_pgio_header *hdr)
2116 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2118 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2119 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2120 nfs_pageio_reset_read_mds(desc);
2121 mirror->pg_recoalesce = 1;
2123 nfs_pgio_data_destroy(hdr);
2128 * Call the appropriate parallel I/O subsystem read function.
2130 static enum pnfs_try_status
2131 pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2132 const struct rpc_call_ops *call_ops,
2133 struct pnfs_layout_segment *lseg)
2135 struct inode *inode = hdr->inode;
2136 struct nfs_server *nfss = NFS_SERVER(inode);
2137 enum pnfs_try_status trypnfs;
2139 hdr->mds_ops = call_ops;
2141 dprintk("%s: Reading ino:%lu %u@%llu\n",
2142 __func__, inode->i_ino, hdr->args.count, hdr->args.offset);
2144 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
2145 if (trypnfs != PNFS_NOT_ATTEMPTED)
2146 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
2147 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2151 /* Resend all requests through pnfs. */
2152 void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
2154 struct nfs_pageio_descriptor pgio;
2156 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2157 nfs_pageio_init_read(&pgio, hdr->inode, false,
2158 hdr->completion_ops);
2159 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
2162 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
2165 pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
2167 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2168 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2169 enum pnfs_try_status trypnfs;
2171 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
2172 if (trypnfs == PNFS_TRY_AGAIN)
2173 pnfs_read_resend_pnfs(hdr);
2174 if (trypnfs == PNFS_NOT_ATTEMPTED || hdr->task.tk_status)
2175 pnfs_read_through_mds(desc, hdr);
2178 static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
2180 pnfs_put_lseg(hdr->lseg);
2181 nfs_pgio_header_free(hdr);
2185 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
2187 struct nfs_pgio_header *hdr;
2190 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2192 desc->pg_error = -ENOMEM;
2193 return desc->pg_error;
2195 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
2196 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2197 ret = nfs_generic_pgio(desc, hdr);
2199 pnfs_do_read(desc, hdr);
2202 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
2204 static void pnfs_clear_layoutcommitting(struct inode *inode)
2206 unsigned long *bitlock = &NFS_I(inode)->flags;
2208 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
2209 smp_mb__after_atomic();
2210 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
2214 * There can be multiple RW segments.
2216 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
2218 struct pnfs_layout_segment *lseg;
2220 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
2221 if (lseg->pls_range.iomode == IOMODE_RW &&
2222 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
2223 list_add(&lseg->pls_lc_list, listp);
2227 static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
2229 struct pnfs_layout_segment *lseg, *tmp;
2231 /* Matched by references in pnfs_set_layoutcommit */
2232 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
2233 list_del_init(&lseg->pls_lc_list);
2234 pnfs_put_lseg(lseg);
2237 pnfs_clear_layoutcommitting(inode);
2240 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
2242 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
2244 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
2247 pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
2250 struct nfs_inode *nfsi = NFS_I(inode);
2251 bool mark_as_dirty = false;
2253 spin_lock(&inode->i_lock);
2254 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
2255 nfsi->layout->plh_lwb = end_pos;
2256 mark_as_dirty = true;
2257 dprintk("%s: Set layoutcommit for inode %lu ",
2258 __func__, inode->i_ino);
2259 } else if (end_pos > nfsi->layout->plh_lwb)
2260 nfsi->layout->plh_lwb = end_pos;
2261 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
2262 /* references matched in nfs4_layoutcommit_release */
2263 pnfs_get_lseg(lseg);
2265 spin_unlock(&inode->i_lock);
2266 dprintk("%s: lseg %p end_pos %llu\n",
2267 __func__, lseg, nfsi->layout->plh_lwb);
2269 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2270 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2272 mark_inode_dirty_sync(inode);
2274 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
2276 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
2278 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
2280 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
2281 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
2282 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
2286 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
2287 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
2288 * data to disk to allow the server to recover the data if it crashes.
2289 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
2290 * is off, and a COMMIT is sent to a data server, or
2291 * if WRITEs to a data server return NFS_DATA_SYNC.
2294 pnfs_layoutcommit_inode(struct inode *inode, bool sync)
2296 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2297 struct nfs4_layoutcommit_data *data;
2298 struct nfs_inode *nfsi = NFS_I(inode);
2302 if (!pnfs_layoutcommit_outstanding(inode))
2305 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
2308 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
2311 status = wait_on_bit_lock_action(&nfsi->flags,
2312 NFS_INO_LAYOUTCOMMITTING,
2313 nfs_wait_bit_killable,
2320 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
2321 data = kzalloc(sizeof(*data), GFP_NOFS);
2323 goto clear_layoutcommitting;
2326 spin_lock(&inode->i_lock);
2327 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
2330 INIT_LIST_HEAD(&data->lseg_list);
2331 pnfs_list_write_lseg(inode, &data->lseg_list);
2333 end_pos = nfsi->layout->plh_lwb;
2335 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
2336 spin_unlock(&inode->i_lock);
2338 data->args.inode = inode;
2339 data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
2340 nfs_fattr_init(&data->fattr);
2341 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
2342 data->res.fattr = &data->fattr;
2343 data->args.lastbytewritten = end_pos - 1;
2344 data->res.server = NFS_SERVER(inode);
2346 if (ld->prepare_layoutcommit) {
2347 status = ld->prepare_layoutcommit(&data->args);
2349 put_rpccred(data->cred);
2350 spin_lock(&inode->i_lock);
2351 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
2352 if (end_pos > nfsi->layout->plh_lwb)
2353 nfsi->layout->plh_lwb = end_pos;
2359 status = nfs4_proc_layoutcommit(data, sync);
2362 mark_inode_dirty_sync(inode);
2363 dprintk("<-- %s status %d\n", __func__, status);
2366 spin_unlock(&inode->i_lock);
2368 clear_layoutcommitting:
2369 pnfs_clear_layoutcommitting(inode);
2372 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
2375 pnfs_generic_sync(struct inode *inode, bool datasync)
2377 return pnfs_layoutcommit_inode(inode, true);
2379 EXPORT_SYMBOL_GPL(pnfs_generic_sync);
2381 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
2383 struct nfs4_threshold *thp;
2385 thp = kzalloc(sizeof(*thp), GFP_NOFS);
2387 dprintk("%s mdsthreshold allocation failed\n", __func__);
2393 #if IS_ENABLED(CONFIG_NFS_V4_2)
2395 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
2397 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2398 struct nfs_server *server = NFS_SERVER(inode);
2399 struct nfs_inode *nfsi = NFS_I(inode);
2400 struct nfs42_layoutstat_data *data;
2401 struct pnfs_layout_hdr *hdr;
2404 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
2407 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
2410 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
2413 spin_lock(&inode->i_lock);
2414 if (!NFS_I(inode)->layout) {
2415 spin_unlock(&inode->i_lock);
2416 goto out_clear_layoutstats;
2418 hdr = NFS_I(inode)->layout;
2419 pnfs_get_layout_hdr(hdr);
2420 spin_unlock(&inode->i_lock);
2422 data = kzalloc(sizeof(*data), gfp_flags);
2428 data->args.fh = NFS_FH(inode);
2429 data->args.inode = inode;
2430 nfs4_stateid_copy(&data->args.stateid, &hdr->plh_stateid);
2431 status = ld->prepare_layoutstats(&data->args);
2435 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
2438 dprintk("%s returns %d\n", __func__, status);
2444 pnfs_put_layout_hdr(hdr);
2445 out_clear_layoutstats:
2446 smp_mb__before_atomic();
2447 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
2448 smp_mb__after_atomic();
2451 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
2454 unsigned int layoutstats_timer;
2455 module_param(layoutstats_timer, uint, 0644);
2456 EXPORT_SYMBOL_GPL(layoutstats_timer);