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>
37 #define NFSDBG_FACILITY NFSDBG_PNFS
38 #define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
43 * protects pnfs_modules_tbl.
45 static DEFINE_SPINLOCK(pnfs_spinlock);
48 * pnfs_modules_tbl holds all pnfs modules
50 static LIST_HEAD(pnfs_modules_tbl);
52 /* Return the registered pnfs layout driver module matching given id */
53 static struct pnfs_layoutdriver_type *
54 find_pnfs_driver_locked(u32 id)
56 struct pnfs_layoutdriver_type *local;
58 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
63 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
67 static struct pnfs_layoutdriver_type *
68 find_pnfs_driver(u32 id)
70 struct pnfs_layoutdriver_type *local;
72 spin_lock(&pnfs_spinlock);
73 local = find_pnfs_driver_locked(id);
74 if (local != NULL && !try_module_get(local->owner)) {
75 dprintk("%s: Could not grab reference on module\n", __func__);
78 spin_unlock(&pnfs_spinlock);
83 unset_pnfs_layoutdriver(struct nfs_server *nfss)
85 if (nfss->pnfs_curr_ld) {
86 if (nfss->pnfs_curr_ld->clear_layoutdriver)
87 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
88 /* Decrement the MDS count. Purge the deviceid cache if zero */
89 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
90 nfs4_deviceid_purge_client(nfss->nfs_client);
91 module_put(nfss->pnfs_curr_ld->owner);
93 nfss->pnfs_curr_ld = NULL;
97 * Try to set the server's pnfs module to the pnfs layout type specified by id.
98 * Currently only one pNFS layout driver per filesystem is supported.
100 * @id layout type. Zero (illegal layout type) indicates pNFS not in use.
103 set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
106 struct pnfs_layoutdriver_type *ld_type = NULL;
110 if (!(server->nfs_client->cl_exchange_flags &
111 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
112 printk(KERN_ERR "NFS: %s: id %u cl_exchange_flags 0x%x\n",
113 __func__, id, server->nfs_client->cl_exchange_flags);
116 ld_type = find_pnfs_driver(id);
118 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id);
119 ld_type = find_pnfs_driver(id);
121 dprintk("%s: No pNFS module found for %u.\n",
126 server->pnfs_curr_ld = ld_type;
127 if (ld_type->set_layoutdriver
128 && ld_type->set_layoutdriver(server, mntfh)) {
129 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
130 "driver %u.\n", __func__, id);
131 module_put(ld_type->owner);
134 /* Bump the MDS count */
135 atomic_inc(&server->nfs_client->cl_mds_count);
137 dprintk("%s: pNFS module for %u set\n", __func__, id);
141 dprintk("%s: Using NFSv4 I/O\n", __func__);
142 server->pnfs_curr_ld = NULL;
146 pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
148 int status = -EINVAL;
149 struct pnfs_layoutdriver_type *tmp;
151 if (ld_type->id == 0) {
152 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
155 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
156 printk(KERN_ERR "NFS: %s Layout driver must provide "
157 "alloc_lseg and free_lseg.\n", __func__);
161 spin_lock(&pnfs_spinlock);
162 tmp = find_pnfs_driver_locked(ld_type->id);
164 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
166 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
169 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
170 __func__, ld_type->id);
172 spin_unlock(&pnfs_spinlock);
176 EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
179 pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
181 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
182 spin_lock(&pnfs_spinlock);
183 list_del(&ld_type->pnfs_tblid);
184 spin_unlock(&pnfs_spinlock);
186 EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
189 * pNFS client layout cache
192 /* Need to hold i_lock if caller does not already hold reference */
194 pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
196 atomic_inc(&lo->plh_refcount);
199 static struct pnfs_layout_hdr *
200 pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
202 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
203 return ld->alloc_layout_hdr ? ld->alloc_layout_hdr(ino, gfp_flags) :
204 kzalloc(sizeof(struct pnfs_layout_hdr), gfp_flags);
208 pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
210 struct pnfs_layoutdriver_type *ld = NFS_SERVER(lo->plh_inode)->pnfs_curr_ld;
211 put_rpccred(lo->plh_lc_cred);
212 return ld->alloc_layout_hdr ? ld->free_layout_hdr(lo) : kfree(lo);
216 pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
218 struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
219 dprintk("%s: freeing layout cache %p\n", __func__, lo);
220 BUG_ON(!list_empty(&lo->plh_layouts));
222 /* Reset MDS Threshold I/O counters */
228 pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
230 struct inode *inode = lo->plh_inode;
232 if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
233 pnfs_detach_layout_hdr(lo);
234 spin_unlock(&inode->i_lock);
235 pnfs_free_layout_hdr(lo);
240 pnfs_iomode_to_fail_bit(u32 iomode)
242 return iomode == IOMODE_RW ?
243 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
247 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
249 lo->plh_retry_timestamp = jiffies;
250 if (test_and_set_bit(fail_bit, &lo->plh_flags))
251 atomic_inc(&lo->plh_refcount);
255 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
257 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
258 atomic_dec(&lo->plh_refcount);
262 pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
264 struct inode *inode = lo->plh_inode;
265 struct pnfs_layout_range range = {
268 .length = NFS4_MAX_UINT64,
272 spin_lock(&inode->i_lock);
273 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
274 pnfs_mark_matching_lsegs_invalid(lo, &head, &range);
275 spin_unlock(&inode->i_lock);
276 pnfs_free_lseg_list(&head);
277 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
278 iomode == IOMODE_RW ? "RW" : "READ");
282 pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
284 unsigned long start, end;
285 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
287 if (test_bit(fail_bit, &lo->plh_flags) == 0)
290 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
291 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
292 /* It is time to retry the failed layoutgets */
293 pnfs_layout_clear_fail_bit(lo, fail_bit);
300 init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg)
302 INIT_LIST_HEAD(&lseg->pls_list);
303 INIT_LIST_HEAD(&lseg->pls_lc_list);
304 atomic_set(&lseg->pls_refcount, 1);
306 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
307 lseg->pls_layout = lo;
310 static void free_lseg(struct pnfs_layout_segment *lseg)
312 struct inode *ino = lseg->pls_layout->plh_inode;
314 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
315 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
316 pnfs_put_layout_hdr(NFS_I(ino)->layout);
320 pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
321 struct pnfs_layout_segment *lseg)
323 struct inode *inode = lo->plh_inode;
325 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
326 list_del_init(&lseg->pls_list);
327 if (list_empty(&lo->plh_segs))
328 set_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags);
329 rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq);
333 pnfs_put_lseg(struct pnfs_layout_segment *lseg)
335 struct pnfs_layout_hdr *lo;
341 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
342 atomic_read(&lseg->pls_refcount),
343 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
344 lo = lseg->pls_layout;
345 inode = lo->plh_inode;
346 if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
349 pnfs_layout_remove_lseg(lo, lseg);
350 spin_unlock(&inode->i_lock);
351 list_add(&lseg->pls_list, &free_me);
352 pnfs_free_lseg_list(&free_me);
355 EXPORT_SYMBOL_GPL(pnfs_put_lseg);
358 end_offset(u64 start, u64 len)
363 return end >= start ? end : NFS4_MAX_UINT64;
366 /* last octet in a range */
368 last_byte_offset(u64 start, u64 len)
374 return end > start ? end - 1 : NFS4_MAX_UINT64;
378 * is l2 fully contained in l1?
380 * [----------------------------------)
385 lo_seg_contained(struct pnfs_layout_range *l1,
386 struct pnfs_layout_range *l2)
388 u64 start1 = l1->offset;
389 u64 end1 = end_offset(start1, l1->length);
390 u64 start2 = l2->offset;
391 u64 end2 = end_offset(start2, l2->length);
393 return (start1 <= start2) && (end1 >= end2);
397 * is l1 and l2 intersecting?
399 * [----------------------------------)
404 lo_seg_intersecting(struct pnfs_layout_range *l1,
405 struct pnfs_layout_range *l2)
407 u64 start1 = l1->offset;
408 u64 end1 = end_offset(start1, l1->length);
409 u64 start2 = l2->offset;
410 u64 end2 = end_offset(start2, l2->length);
412 return (end1 == NFS4_MAX_UINT64 || end1 > start2) &&
413 (end2 == NFS4_MAX_UINT64 || end2 > start1);
417 should_free_lseg(struct pnfs_layout_range *lseg_range,
418 struct pnfs_layout_range *recall_range)
420 return (recall_range->iomode == IOMODE_ANY ||
421 lseg_range->iomode == recall_range->iomode) &&
422 lo_seg_intersecting(lseg_range, recall_range);
425 /* Returns 1 if lseg is removed from list, 0 otherwise */
426 static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
427 struct list_head *tmp_list)
431 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
432 /* Remove the reference keeping the lseg in the
433 * list. It will now be removed when all
434 * outstanding io is finished.
436 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
437 atomic_read(&lseg->pls_refcount));
438 if (atomic_dec_and_test(&lseg->pls_refcount)) {
439 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
440 list_add(&lseg->pls_list, tmp_list);
447 /* Returns count of number of matching invalid lsegs remaining in list
451 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
452 struct list_head *tmp_list,
453 struct pnfs_layout_range *recall_range)
455 struct pnfs_layout_segment *lseg, *next;
456 int invalid = 0, removed = 0;
458 dprintk("%s:Begin lo %p\n", __func__, lo);
460 if (list_empty(&lo->plh_segs)) {
461 set_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags);
464 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
466 should_free_lseg(&lseg->pls_range, recall_range)) {
467 dprintk("%s: freeing lseg %p iomode %d "
468 "offset %llu length %llu\n", __func__,
469 lseg, lseg->pls_range.iomode, lseg->pls_range.offset,
470 lseg->pls_range.length);
472 removed += mark_lseg_invalid(lseg, tmp_list);
474 dprintk("%s:Return %i\n", __func__, invalid - removed);
475 return invalid - removed;
478 /* note free_me must contain lsegs from a single layout_hdr */
480 pnfs_free_lseg_list(struct list_head *free_me)
482 struct pnfs_layout_segment *lseg, *tmp;
483 struct pnfs_layout_hdr *lo;
485 if (list_empty(free_me))
488 lo = list_first_entry(free_me, struct pnfs_layout_segment,
489 pls_list)->pls_layout;
491 if (test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags)) {
492 struct nfs_client *clp;
494 clp = NFS_SERVER(lo->plh_inode)->nfs_client;
495 spin_lock(&clp->cl_lock);
496 list_del_init(&lo->plh_layouts);
497 spin_unlock(&clp->cl_lock);
499 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
500 list_del(&lseg->pls_list);
506 pnfs_destroy_layout(struct nfs_inode *nfsi)
508 struct pnfs_layout_hdr *lo;
511 spin_lock(&nfsi->vfs_inode.i_lock);
514 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
515 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
516 pnfs_get_layout_hdr(lo);
517 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
518 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
519 spin_unlock(&nfsi->vfs_inode.i_lock);
520 pnfs_free_lseg_list(&tmp_list);
521 pnfs_put_layout_hdr(lo);
523 spin_unlock(&nfsi->vfs_inode.i_lock);
525 EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
528 * Called by the state manger to remove all layouts established under an
532 pnfs_destroy_all_layouts(struct nfs_client *clp)
534 struct nfs_server *server;
535 struct pnfs_layout_hdr *lo;
538 nfs4_deviceid_mark_client_invalid(clp);
539 nfs4_deviceid_purge_client(clp);
541 spin_lock(&clp->cl_lock);
543 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
544 if (!list_empty(&server->layouts))
545 list_splice_init(&server->layouts, &tmp_list);
548 spin_unlock(&clp->cl_lock);
550 while (!list_empty(&tmp_list)) {
551 lo = list_entry(tmp_list.next, struct pnfs_layout_hdr,
553 dprintk("%s freeing layout for inode %lu\n", __func__,
554 lo->plh_inode->i_ino);
555 list_del_init(&lo->plh_layouts);
556 pnfs_destroy_layout(NFS_I(lo->plh_inode));
560 /* update lo->plh_stateid with new if is more recent */
562 pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
567 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
568 newseq = be32_to_cpu(new->seqid);
569 if ((int)(newseq - oldseq) > 0) {
570 nfs4_stateid_copy(&lo->plh_stateid, new);
571 if (update_barrier) {
572 u32 new_barrier = be32_to_cpu(new->seqid);
574 if ((int)(new_barrier - lo->plh_barrier))
575 lo->plh_barrier = new_barrier;
577 /* Because of wraparound, we want to keep the barrier
578 * "close" to the current seqids. It needs to be
579 * within 2**31 to count as "behind", so if it
580 * gets too near that limit, give us a litle leeway
581 * and bring it to within 2**30.
582 * NOTE - and yes, this is all unsigned arithmetic.
584 if (unlikely((newseq - lo->plh_barrier) > (3 << 29)))
585 lo->plh_barrier = newseq - (1 << 30);
590 /* lget is set to 1 if called from inside send_layoutget call chain */
592 pnfs_layoutgets_blocked(struct pnfs_layout_hdr *lo, nfs4_stateid *stateid,
596 (int)(lo->plh_barrier - be32_to_cpu(stateid->seqid)) >= 0)
598 return lo->plh_block_lgets ||
599 test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags) ||
600 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
601 (list_empty(&lo->plh_segs) &&
602 (atomic_read(&lo->plh_outstanding) > lget));
606 pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
607 struct nfs4_state *open_state)
611 dprintk("--> %s\n", __func__);
612 spin_lock(&lo->plh_inode->i_lock);
613 if (pnfs_layoutgets_blocked(lo, NULL, 1)) {
615 } else if (list_empty(&lo->plh_segs)) {
619 seq = read_seqbegin(&open_state->seqlock);
620 nfs4_stateid_copy(dst, &open_state->stateid);
621 } while (read_seqretry(&open_state->seqlock, seq));
623 nfs4_stateid_copy(dst, &lo->plh_stateid);
624 spin_unlock(&lo->plh_inode->i_lock);
625 dprintk("<-- %s\n", __func__);
630 * Get layout from server.
631 * for now, assume that whole file layouts are requested.
633 * arg->length: all ones
635 static struct pnfs_layout_segment *
636 send_layoutget(struct pnfs_layout_hdr *lo,
637 struct nfs_open_context *ctx,
638 struct pnfs_layout_range *range,
641 struct inode *ino = lo->plh_inode;
642 struct nfs_server *server = NFS_SERVER(ino);
643 struct nfs4_layoutget *lgp;
644 struct pnfs_layout_segment *lseg;
646 dprintk("--> %s\n", __func__);
649 lgp = kzalloc(sizeof(*lgp), gfp_flags);
653 lgp->args.minlength = PAGE_CACHE_SIZE;
654 if (lgp->args.minlength > range->length)
655 lgp->args.minlength = range->length;
656 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
657 lgp->args.range = *range;
658 lgp->args.type = server->pnfs_curr_ld->id;
659 lgp->args.inode = ino;
660 lgp->args.ctx = get_nfs_open_context(ctx);
661 lgp->gfp_flags = gfp_flags;
663 /* Synchronously retrieve layout information from server and
666 lseg = nfs4_proc_layoutget(lgp, gfp_flags);
668 switch (PTR_ERR(lseg)) {
673 /* remember that LAYOUTGET failed and suspend trying */
674 pnfs_layout_io_set_failed(lo, range->iomode);
683 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
684 * when the layout segment list is empty.
686 * Note that a pnfs_layout_hdr can exist with an empty layout segment
687 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
688 * deviceid is marked invalid.
691 _pnfs_return_layout(struct inode *ino)
693 struct pnfs_layout_hdr *lo = NULL;
694 struct nfs_inode *nfsi = NFS_I(ino);
696 struct nfs4_layoutreturn *lrp;
697 nfs4_stateid stateid;
698 int status = 0, empty;
700 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
702 spin_lock(&ino->i_lock);
704 if (!lo || pnfs_test_layout_returned(lo)) {
705 spin_unlock(&ino->i_lock);
706 dprintk("NFS: %s no layout to return\n", __func__);
709 stateid = nfsi->layout->plh_stateid;
710 /* Reference matched in nfs4_layoutreturn_release */
711 pnfs_get_layout_hdr(lo);
712 empty = list_empty(&lo->plh_segs);
713 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
714 /* Don't send a LAYOUTRETURN if list was initially empty */
716 spin_unlock(&ino->i_lock);
717 pnfs_put_layout_hdr(lo);
718 dprintk("NFS: %s no layout segments to return\n", __func__);
721 lo->plh_block_lgets++;
722 pnfs_mark_layout_returned(lo);
723 spin_unlock(&ino->i_lock);
724 pnfs_free_lseg_list(&tmp_list);
726 WARN_ON(test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags));
728 lrp = kzalloc(sizeof(*lrp), GFP_KERNEL);
729 if (unlikely(lrp == NULL)) {
731 pnfs_layout_io_set_failed(lo, IOMODE_RW);
732 pnfs_layout_io_set_failed(lo, IOMODE_READ);
733 pnfs_clear_layout_returned(lo);
734 pnfs_put_layout_hdr(lo);
738 lrp->args.stateid = stateid;
739 lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id;
740 lrp->args.inode = ino;
741 lrp->args.layout = lo;
742 lrp->clp = NFS_SERVER(ino)->nfs_client;
744 status = nfs4_proc_layoutreturn(lrp);
746 dprintk("<-- %s status: %d\n", __func__, status);
749 EXPORT_SYMBOL_GPL(_pnfs_return_layout);
751 bool pnfs_roc(struct inode *ino)
753 struct pnfs_layout_hdr *lo;
754 struct pnfs_layout_segment *lseg, *tmp;
758 spin_lock(&ino->i_lock);
759 lo = NFS_I(ino)->layout;
760 if (!lo || !test_and_clear_bit(NFS_LAYOUT_ROC, &lo->plh_flags) ||
761 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
763 list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
764 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
765 mark_lseg_invalid(lseg, &tmp_list);
770 lo->plh_block_lgets++;
771 pnfs_get_layout_hdr(lo); /* matched in pnfs_roc_release */
772 spin_unlock(&ino->i_lock);
773 pnfs_free_lseg_list(&tmp_list);
777 spin_unlock(&ino->i_lock);
781 void pnfs_roc_release(struct inode *ino)
783 struct pnfs_layout_hdr *lo;
785 spin_lock(&ino->i_lock);
786 lo = NFS_I(ino)->layout;
787 lo->plh_block_lgets--;
788 if (atomic_dec_and_test(&lo->plh_refcount)) {
789 pnfs_detach_layout_hdr(lo);
790 spin_unlock(&ino->i_lock);
791 pnfs_free_layout_hdr(lo);
793 spin_unlock(&ino->i_lock);
796 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
798 struct pnfs_layout_hdr *lo;
800 spin_lock(&ino->i_lock);
801 lo = NFS_I(ino)->layout;
802 if ((int)(barrier - lo->plh_barrier) > 0)
803 lo->plh_barrier = barrier;
804 spin_unlock(&ino->i_lock);
807 bool pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task)
809 struct nfs_inode *nfsi = NFS_I(ino);
810 struct pnfs_layout_hdr *lo;
811 struct pnfs_layout_segment *lseg;
815 spin_lock(&ino->i_lock);
816 list_for_each_entry(lseg, &nfsi->layout->plh_segs, pls_list)
817 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
818 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
823 current_seqid = be32_to_cpu(lo->plh_stateid.seqid);
825 /* Since close does not return a layout stateid for use as
826 * a barrier, we choose the worst-case barrier.
828 *barrier = current_seqid + atomic_read(&lo->plh_outstanding);
830 spin_unlock(&ino->i_lock);
835 * Compare two layout segments for sorting into layout cache.
836 * We want to preferentially return RW over RO layouts, so ensure those
840 cmp_layout(struct pnfs_layout_range *l1,
841 struct pnfs_layout_range *l2)
845 /* high offset > low offset */
846 d = l1->offset - l2->offset;
850 /* short length > long length */
851 d = l2->length - l1->length;
855 /* read > read/write */
856 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
860 pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
861 struct pnfs_layout_segment *lseg)
863 struct pnfs_layout_segment *lp;
865 dprintk("%s:Begin\n", __func__);
867 assert_spin_locked(&lo->plh_inode->i_lock);
868 list_for_each_entry(lp, &lo->plh_segs, pls_list) {
869 if (cmp_layout(&lseg->pls_range, &lp->pls_range) > 0)
871 list_add_tail(&lseg->pls_list, &lp->pls_list);
872 dprintk("%s: inserted lseg %p "
873 "iomode %d offset %llu length %llu before "
874 "lp %p iomode %d offset %llu length %llu\n",
875 __func__, lseg, lseg->pls_range.iomode,
876 lseg->pls_range.offset, lseg->pls_range.length,
877 lp, lp->pls_range.iomode, lp->pls_range.offset,
878 lp->pls_range.length);
881 list_add_tail(&lseg->pls_list, &lo->plh_segs);
882 dprintk("%s: inserted lseg %p "
883 "iomode %d offset %llu length %llu at tail\n",
884 __func__, lseg, lseg->pls_range.iomode,
885 lseg->pls_range.offset, lseg->pls_range.length);
887 pnfs_get_layout_hdr(lo);
889 dprintk("%s:Return\n", __func__);
892 static struct pnfs_layout_hdr *
893 alloc_init_layout_hdr(struct inode *ino,
894 struct nfs_open_context *ctx,
897 struct pnfs_layout_hdr *lo;
899 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
902 atomic_set(&lo->plh_refcount, 1);
903 INIT_LIST_HEAD(&lo->plh_layouts);
904 INIT_LIST_HEAD(&lo->plh_segs);
905 INIT_LIST_HEAD(&lo->plh_bulk_recall);
907 lo->plh_lc_cred = get_rpccred(ctx->state->owner->so_cred);
911 static struct pnfs_layout_hdr *
912 pnfs_find_alloc_layout(struct inode *ino,
913 struct nfs_open_context *ctx,
916 struct nfs_inode *nfsi = NFS_I(ino);
917 struct pnfs_layout_hdr *new = NULL;
919 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
921 assert_spin_locked(&ino->i_lock);
923 if (test_bit(NFS_LAYOUT_DESTROYED, &nfsi->layout->plh_flags))
925 pnfs_get_layout_hdr(nfsi->layout);
928 spin_unlock(&ino->i_lock);
929 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
930 spin_lock(&ino->i_lock);
932 if (likely(nfsi->layout == NULL)) /* Won the race? */
935 pnfs_free_layout_hdr(new);
940 * iomode matching rules:
951 is_matching_lseg(struct pnfs_layout_range *ls_range,
952 struct pnfs_layout_range *range)
954 struct pnfs_layout_range range1;
956 if ((range->iomode == IOMODE_RW &&
957 ls_range->iomode != IOMODE_RW) ||
958 !lo_seg_intersecting(ls_range, range))
961 /* range1 covers only the first byte in the range */
964 return lo_seg_contained(ls_range, &range1);
968 * lookup range in layout
970 static struct pnfs_layout_segment *
971 pnfs_find_lseg(struct pnfs_layout_hdr *lo,
972 struct pnfs_layout_range *range)
974 struct pnfs_layout_segment *lseg, *ret = NULL;
976 dprintk("%s:Begin\n", __func__);
978 assert_spin_locked(&lo->plh_inode->i_lock);
979 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
980 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
981 is_matching_lseg(&lseg->pls_range, range)) {
982 ret = pnfs_get_lseg(lseg);
985 if (lseg->pls_range.offset > range->offset)
989 dprintk("%s:Return lseg %p ref %d\n",
990 __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
995 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
996 * to the MDS or over pNFS
998 * The nfs_inode read_io and write_io fields are cumulative counters reset
999 * when there are no layout segments. Note that in pnfs_update_layout iomode
1000 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1003 * A return of true means use MDS I/O.
1006 * If a file's size is smaller than the file size threshold, data accesses
1007 * SHOULD be sent to the metadata server. If an I/O request has a length that
1008 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1009 * server. If both file size and I/O size are provided, the client SHOULD
1010 * reach or exceed both thresholds before sending its read or write
1011 * requests to the data server.
1013 static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1014 struct inode *ino, int iomode)
1016 struct nfs4_threshold *t = ctx->mdsthreshold;
1017 struct nfs_inode *nfsi = NFS_I(ino);
1018 loff_t fsize = i_size_read(ino);
1019 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1024 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1025 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1029 if (t->bm & THRESHOLD_RD) {
1030 dprintk("%s fsize %llu\n", __func__, fsize);
1032 if (fsize < t->rd_sz)
1035 if (t->bm & THRESHOLD_RD_IO) {
1036 dprintk("%s nfsi->read_io %llu\n", __func__,
1039 if (nfsi->read_io < t->rd_io_sz)
1044 if (t->bm & THRESHOLD_WR) {
1045 dprintk("%s fsize %llu\n", __func__, fsize);
1047 if (fsize < t->wr_sz)
1050 if (t->bm & THRESHOLD_WR_IO) {
1051 dprintk("%s nfsi->write_io %llu\n", __func__,
1054 if (nfsi->write_io < t->wr_io_sz)
1059 if (size_set && io_set) {
1062 } else if (size || io)
1065 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1070 * Layout segment is retreived from the server if not cached.
1071 * The appropriate layout segment is referenced and returned to the caller.
1073 struct pnfs_layout_segment *
1074 pnfs_update_layout(struct inode *ino,
1075 struct nfs_open_context *ctx,
1078 enum pnfs_iomode iomode,
1081 struct pnfs_layout_range arg = {
1087 struct nfs_server *server = NFS_SERVER(ino);
1088 struct nfs_client *clp = server->nfs_client;
1089 struct pnfs_layout_hdr *lo;
1090 struct pnfs_layout_segment *lseg = NULL;
1093 if (!pnfs_enabled_sb(NFS_SERVER(ino)))
1096 if (pnfs_within_mdsthreshold(ctx, ino, iomode))
1099 spin_lock(&ino->i_lock);
1100 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1102 spin_unlock(&ino->i_lock);
1106 /* Do we even need to bother with this? */
1107 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1108 dprintk("%s matches recall, use MDS\n", __func__);
1112 /* if LAYOUTGET already failed once we don't try again */
1113 if (pnfs_layout_io_test_failed(lo, iomode))
1116 /* Check to see if the layout for the given range already exists */
1117 lseg = pnfs_find_lseg(lo, &arg);
1121 if (pnfs_layoutgets_blocked(lo, NULL, 0))
1123 atomic_inc(&lo->plh_outstanding);
1125 if (list_empty(&lo->plh_segs))
1128 /* Enable LAYOUTRETURNs */
1129 pnfs_clear_layout_returned(lo);
1131 spin_unlock(&ino->i_lock);
1133 /* The lo must be on the clp list if there is any
1134 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1136 spin_lock(&clp->cl_lock);
1137 BUG_ON(!list_empty(&lo->plh_layouts));
1138 list_add_tail(&lo->plh_layouts, &server->layouts);
1139 spin_unlock(&clp->cl_lock);
1142 pg_offset = arg.offset & ~PAGE_CACHE_MASK;
1144 arg.offset -= pg_offset;
1145 arg.length += pg_offset;
1147 if (arg.length != NFS4_MAX_UINT64)
1148 arg.length = PAGE_CACHE_ALIGN(arg.length);
1150 lseg = send_layoutget(lo, ctx, &arg, gfp_flags);
1151 if (!lseg && first) {
1152 spin_lock(&clp->cl_lock);
1153 list_del_init(&lo->plh_layouts);
1154 spin_unlock(&clp->cl_lock);
1156 atomic_dec(&lo->plh_outstanding);
1158 pnfs_put_layout_hdr(lo);
1160 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1161 "(%s, offset: %llu, length: %llu)\n",
1162 __func__, ino->i_sb->s_id,
1163 (unsigned long long)NFS_FILEID(ino),
1164 lseg == NULL ? "not found" : "found",
1165 iomode==IOMODE_RW ? "read/write" : "read-only",
1166 (unsigned long long)pos,
1167 (unsigned long long)count);
1170 spin_unlock(&ino->i_lock);
1171 goto out_put_layout_hdr;
1173 EXPORT_SYMBOL_GPL(pnfs_update_layout);
1175 struct pnfs_layout_segment *
1176 pnfs_layout_process(struct nfs4_layoutget *lgp)
1178 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
1179 struct nfs4_layoutget_res *res = &lgp->res;
1180 struct pnfs_layout_segment *lseg;
1181 struct inode *ino = lo->plh_inode;
1184 /* Inject layout blob into I/O device driver */
1185 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1186 if (!lseg || IS_ERR(lseg)) {
1190 status = PTR_ERR(lseg);
1191 dprintk("%s: Could not allocate layout: error %d\n",
1196 spin_lock(&ino->i_lock);
1197 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1198 dprintk("%s forget reply due to recall\n", __func__);
1199 goto out_forget_reply;
1202 if (pnfs_layoutgets_blocked(lo, &res->stateid, 1)) {
1203 dprintk("%s forget reply due to state\n", __func__);
1204 goto out_forget_reply;
1206 init_lseg(lo, lseg);
1207 lseg->pls_range = res->range;
1208 pnfs_get_lseg(lseg);
1209 pnfs_layout_insert_lseg(lo, lseg);
1211 if (res->return_on_close) {
1212 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
1213 set_bit(NFS_LAYOUT_ROC, &lo->plh_flags);
1216 /* Done processing layoutget. Set the layout stateid */
1217 pnfs_set_layout_stateid(lo, &res->stateid, false);
1218 spin_unlock(&ino->i_lock);
1221 return ERR_PTR(status);
1224 spin_unlock(&ino->i_lock);
1225 lseg->pls_layout = lo;
1226 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1231 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1233 BUG_ON(pgio->pg_lseg != NULL);
1235 if (req->wb_offset != req->wb_pgbase) {
1236 nfs_pageio_reset_read_mds(pgio);
1239 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1245 /* If no lseg, fall back to read through mds */
1246 if (pgio->pg_lseg == NULL)
1247 nfs_pageio_reset_read_mds(pgio);
1250 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
1253 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1255 BUG_ON(pgio->pg_lseg != NULL);
1257 if (req->wb_offset != req->wb_pgbase) {
1258 nfs_pageio_reset_write_mds(pgio);
1261 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1267 /* If no lseg, fall back to write through mds */
1268 if (pgio->pg_lseg == NULL)
1269 nfs_pageio_reset_write_mds(pgio);
1271 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
1274 pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode,
1275 const struct nfs_pgio_completion_ops *compl_ops)
1277 struct nfs_server *server = NFS_SERVER(inode);
1278 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
1281 nfs_pageio_init_read(pgio, inode, compl_ops);
1283 nfs_pageio_init(pgio, inode, ld->pg_read_ops, compl_ops, server->rsize, 0);
1287 pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode,
1289 const struct nfs_pgio_completion_ops *compl_ops)
1291 struct nfs_server *server = NFS_SERVER(inode);
1292 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
1295 nfs_pageio_init_write(pgio, inode, ioflags, compl_ops);
1297 nfs_pageio_init(pgio, inode, ld->pg_write_ops, compl_ops, server->wsize, ioflags);
1301 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
1302 struct nfs_page *req)
1304 if (pgio->pg_lseg == NULL)
1305 return nfs_generic_pg_test(pgio, prev, req);
1308 * Test if a nfs_page is fully contained in the pnfs_layout_range.
1309 * Note that this test makes several assumptions:
1310 * - that the previous nfs_page in the struct nfs_pageio_descriptor
1311 * is known to lie within the range.
1312 * - that the nfs_page being tested is known to be contiguous with the
1313 * previous nfs_page.
1314 * - Layout ranges are page aligned, so we only have to test the
1315 * start offset of the request.
1317 * Please also note that 'end_offset' is actually the offset of the
1318 * first byte that lies outside the pnfs_layout_range. FIXME?
1321 return req_offset(req) < end_offset(pgio->pg_lseg->pls_range.offset,
1322 pgio->pg_lseg->pls_range.length);
1324 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
1326 int pnfs_write_done_resend_to_mds(struct inode *inode,
1327 struct list_head *head,
1328 const struct nfs_pgio_completion_ops *compl_ops)
1330 struct nfs_pageio_descriptor pgio;
1333 /* Resend all requests through the MDS */
1334 nfs_pageio_init_write(&pgio, inode, FLUSH_STABLE, compl_ops);
1335 while (!list_empty(head)) {
1336 struct nfs_page *req = nfs_list_entry(head->next);
1338 nfs_list_remove_request(req);
1339 if (!nfs_pageio_add_request(&pgio, req))
1340 nfs_list_add_request(req, &failed);
1342 nfs_pageio_complete(&pgio);
1344 if (!list_empty(&failed)) {
1345 /* For some reason our attempt to resend pages. Mark the
1346 * overall send request as having failed, and let
1347 * nfs_writeback_release_full deal with the error.
1349 list_move(&failed, head);
1354 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
1356 static void pnfs_ld_handle_write_error(struct nfs_write_data *data)
1358 struct nfs_pgio_header *hdr = data->header;
1360 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
1361 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1362 PNFS_LAYOUTRET_ON_ERROR) {
1363 clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(hdr->inode)->flags);
1364 pnfs_return_layout(hdr->inode);
1366 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
1367 data->task.tk_status = pnfs_write_done_resend_to_mds(hdr->inode,
1369 hdr->completion_ops);
1373 * Called by non rpc-based layout drivers
1375 void pnfs_ld_write_done(struct nfs_write_data *data)
1377 struct nfs_pgio_header *hdr = data->header;
1379 if (!hdr->pnfs_error) {
1380 pnfs_set_layoutcommit(data);
1381 hdr->mds_ops->rpc_call_done(&data->task, data);
1383 pnfs_ld_handle_write_error(data);
1384 hdr->mds_ops->rpc_release(data);
1386 EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
1389 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
1390 struct nfs_write_data *data)
1392 struct nfs_pgio_header *hdr = data->header;
1394 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1395 list_splice_tail_init(&hdr->pages, &desc->pg_list);
1396 nfs_pageio_reset_write_mds(desc);
1397 desc->pg_recoalesce = 1;
1399 nfs_writedata_release(data);
1402 static enum pnfs_try_status
1403 pnfs_try_to_write_data(struct nfs_write_data *wdata,
1404 const struct rpc_call_ops *call_ops,
1405 struct pnfs_layout_segment *lseg,
1408 struct nfs_pgio_header *hdr = wdata->header;
1409 struct inode *inode = hdr->inode;
1410 enum pnfs_try_status trypnfs;
1411 struct nfs_server *nfss = NFS_SERVER(inode);
1413 hdr->mds_ops = call_ops;
1415 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
1416 inode->i_ino, wdata->args.count, wdata->args.offset, how);
1417 trypnfs = nfss->pnfs_curr_ld->write_pagelist(wdata, how);
1418 if (trypnfs != PNFS_NOT_ATTEMPTED)
1419 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
1420 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
1425 pnfs_do_multiple_writes(struct nfs_pageio_descriptor *desc, struct list_head *head, int how)
1427 struct nfs_write_data *data;
1428 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
1429 struct pnfs_layout_segment *lseg = desc->pg_lseg;
1431 desc->pg_lseg = NULL;
1432 while (!list_empty(head)) {
1433 enum pnfs_try_status trypnfs;
1435 data = list_first_entry(head, struct nfs_write_data, list);
1436 list_del_init(&data->list);
1438 trypnfs = pnfs_try_to_write_data(data, call_ops, lseg, how);
1439 if (trypnfs == PNFS_NOT_ATTEMPTED)
1440 pnfs_write_through_mds(desc, data);
1442 pnfs_put_lseg(lseg);
1445 static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
1447 pnfs_put_lseg(hdr->lseg);
1448 nfs_writehdr_free(hdr);
1450 EXPORT_SYMBOL_GPL(pnfs_writehdr_free);
1453 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
1455 struct nfs_write_header *whdr;
1456 struct nfs_pgio_header *hdr;
1459 whdr = nfs_writehdr_alloc();
1461 desc->pg_completion_ops->error_cleanup(&desc->pg_list);
1462 pnfs_put_lseg(desc->pg_lseg);
1463 desc->pg_lseg = NULL;
1466 hdr = &whdr->header;
1467 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
1468 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
1469 atomic_inc(&hdr->refcnt);
1470 ret = nfs_generic_flush(desc, hdr);
1472 pnfs_put_lseg(desc->pg_lseg);
1473 desc->pg_lseg = NULL;
1475 pnfs_do_multiple_writes(desc, &hdr->rpc_list, desc->pg_ioflags);
1476 if (atomic_dec_and_test(&hdr->refcnt))
1477 hdr->completion_ops->completion(hdr);
1480 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
1482 int pnfs_read_done_resend_to_mds(struct inode *inode,
1483 struct list_head *head,
1484 const struct nfs_pgio_completion_ops *compl_ops)
1486 struct nfs_pageio_descriptor pgio;
1489 /* Resend all requests through the MDS */
1490 nfs_pageio_init_read(&pgio, inode, compl_ops);
1491 while (!list_empty(head)) {
1492 struct nfs_page *req = nfs_list_entry(head->next);
1494 nfs_list_remove_request(req);
1495 if (!nfs_pageio_add_request(&pgio, req))
1496 nfs_list_add_request(req, &failed);
1498 nfs_pageio_complete(&pgio);
1500 if (!list_empty(&failed)) {
1501 list_move(&failed, head);
1506 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
1508 static void pnfs_ld_handle_read_error(struct nfs_read_data *data)
1510 struct nfs_pgio_header *hdr = data->header;
1512 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
1513 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1514 PNFS_LAYOUTRET_ON_ERROR) {
1515 clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(hdr->inode)->flags);
1516 pnfs_return_layout(hdr->inode);
1518 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
1519 data->task.tk_status = pnfs_read_done_resend_to_mds(hdr->inode,
1521 hdr->completion_ops);
1525 * Called by non rpc-based layout drivers
1527 void pnfs_ld_read_done(struct nfs_read_data *data)
1529 struct nfs_pgio_header *hdr = data->header;
1531 if (likely(!hdr->pnfs_error)) {
1532 __nfs4_read_done_cb(data);
1533 hdr->mds_ops->rpc_call_done(&data->task, data);
1535 pnfs_ld_handle_read_error(data);
1536 hdr->mds_ops->rpc_release(data);
1538 EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
1541 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
1542 struct nfs_read_data *data)
1544 struct nfs_pgio_header *hdr = data->header;
1546 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1547 list_splice_tail_init(&hdr->pages, &desc->pg_list);
1548 nfs_pageio_reset_read_mds(desc);
1549 desc->pg_recoalesce = 1;
1551 nfs_readdata_release(data);
1555 * Call the appropriate parallel I/O subsystem read function.
1557 static enum pnfs_try_status
1558 pnfs_try_to_read_data(struct nfs_read_data *rdata,
1559 const struct rpc_call_ops *call_ops,
1560 struct pnfs_layout_segment *lseg)
1562 struct nfs_pgio_header *hdr = rdata->header;
1563 struct inode *inode = hdr->inode;
1564 struct nfs_server *nfss = NFS_SERVER(inode);
1565 enum pnfs_try_status trypnfs;
1567 hdr->mds_ops = call_ops;
1569 dprintk("%s: Reading ino:%lu %u@%llu\n",
1570 __func__, inode->i_ino, rdata->args.count, rdata->args.offset);
1572 trypnfs = nfss->pnfs_curr_ld->read_pagelist(rdata);
1573 if (trypnfs != PNFS_NOT_ATTEMPTED)
1574 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
1575 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
1580 pnfs_do_multiple_reads(struct nfs_pageio_descriptor *desc, struct list_head *head)
1582 struct nfs_read_data *data;
1583 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
1584 struct pnfs_layout_segment *lseg = desc->pg_lseg;
1586 desc->pg_lseg = NULL;
1587 while (!list_empty(head)) {
1588 enum pnfs_try_status trypnfs;
1590 data = list_first_entry(head, struct nfs_read_data, list);
1591 list_del_init(&data->list);
1593 trypnfs = pnfs_try_to_read_data(data, call_ops, lseg);
1594 if (trypnfs == PNFS_NOT_ATTEMPTED)
1595 pnfs_read_through_mds(desc, data);
1597 pnfs_put_lseg(lseg);
1600 static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
1602 pnfs_put_lseg(hdr->lseg);
1603 nfs_readhdr_free(hdr);
1605 EXPORT_SYMBOL_GPL(pnfs_readhdr_free);
1608 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
1610 struct nfs_read_header *rhdr;
1611 struct nfs_pgio_header *hdr;
1614 rhdr = nfs_readhdr_alloc();
1616 desc->pg_completion_ops->error_cleanup(&desc->pg_list);
1618 pnfs_put_lseg(desc->pg_lseg);
1619 desc->pg_lseg = NULL;
1622 hdr = &rhdr->header;
1623 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
1624 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
1625 atomic_inc(&hdr->refcnt);
1626 ret = nfs_generic_pagein(desc, hdr);
1628 pnfs_put_lseg(desc->pg_lseg);
1629 desc->pg_lseg = NULL;
1631 pnfs_do_multiple_reads(desc, &hdr->rpc_list);
1632 if (atomic_dec_and_test(&hdr->refcnt))
1633 hdr->completion_ops->completion(hdr);
1636 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
1639 * There can be multiple RW segments.
1641 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
1643 struct pnfs_layout_segment *lseg;
1645 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
1646 if (lseg->pls_range.iomode == IOMODE_RW &&
1647 test_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
1648 list_add(&lseg->pls_lc_list, listp);
1652 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
1654 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
1656 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
1659 pnfs_set_layoutcommit(struct nfs_write_data *wdata)
1661 struct nfs_pgio_header *hdr = wdata->header;
1662 struct inode *inode = hdr->inode;
1663 struct nfs_inode *nfsi = NFS_I(inode);
1664 loff_t end_pos = wdata->mds_offset + wdata->res.count;
1665 bool mark_as_dirty = false;
1667 spin_lock(&inode->i_lock);
1668 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
1669 mark_as_dirty = true;
1670 dprintk("%s: Set layoutcommit for inode %lu ",
1671 __func__, inode->i_ino);
1673 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &hdr->lseg->pls_flags)) {
1674 /* references matched in nfs4_layoutcommit_release */
1675 pnfs_get_lseg(hdr->lseg);
1677 if (end_pos > nfsi->layout->plh_lwb)
1678 nfsi->layout->plh_lwb = end_pos;
1679 spin_unlock(&inode->i_lock);
1680 dprintk("%s: lseg %p end_pos %llu\n",
1681 __func__, hdr->lseg, nfsi->layout->plh_lwb);
1683 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
1684 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
1686 mark_inode_dirty_sync(inode);
1688 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
1690 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
1692 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
1694 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
1695 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
1699 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
1700 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
1701 * data to disk to allow the server to recover the data if it crashes.
1702 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
1703 * is off, and a COMMIT is sent to a data server, or
1704 * if WRITEs to a data server return NFS_DATA_SYNC.
1707 pnfs_layoutcommit_inode(struct inode *inode, bool sync)
1709 struct nfs4_layoutcommit_data *data;
1710 struct nfs_inode *nfsi = NFS_I(inode);
1714 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
1716 if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1719 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
1720 data = kzalloc(sizeof(*data), GFP_NOFS);
1726 if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1729 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
1734 status = wait_on_bit_lock(&nfsi->flags, NFS_INO_LAYOUTCOMMITTING,
1735 nfs_wait_bit_killable, TASK_KILLABLE);
1740 INIT_LIST_HEAD(&data->lseg_list);
1741 spin_lock(&inode->i_lock);
1742 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
1743 clear_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags);
1744 spin_unlock(&inode->i_lock);
1745 wake_up_bit(&nfsi->flags, NFS_INO_LAYOUTCOMMITTING);
1749 pnfs_list_write_lseg(inode, &data->lseg_list);
1751 end_pos = nfsi->layout->plh_lwb;
1752 nfsi->layout->plh_lwb = 0;
1754 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
1755 spin_unlock(&inode->i_lock);
1757 data->args.inode = inode;
1758 data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
1759 nfs_fattr_init(&data->fattr);
1760 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
1761 data->res.fattr = &data->fattr;
1762 data->args.lastbytewritten = end_pos - 1;
1763 data->res.server = NFS_SERVER(inode);
1765 status = nfs4_proc_layoutcommit(data, sync);
1768 mark_inode_dirty_sync(inode);
1769 dprintk("<-- %s status %d\n", __func__, status);
1776 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
1778 struct nfs4_threshold *thp;
1780 thp = kzalloc(sizeof(*thp), GFP_NOFS);
1782 dprintk("%s mdsthreshold allocation failed\n", __func__);