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>
35 #define NFSDBG_FACILITY NFSDBG_PNFS
40 * protects pnfs_modules_tbl.
42 static DEFINE_SPINLOCK(pnfs_spinlock);
45 * pnfs_modules_tbl holds all pnfs modules
47 static LIST_HEAD(pnfs_modules_tbl);
49 /* Return the registered pnfs layout driver module matching given id */
50 static struct pnfs_layoutdriver_type *
51 find_pnfs_driver_locked(u32 id)
53 struct pnfs_layoutdriver_type *local;
55 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
60 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
64 static struct pnfs_layoutdriver_type *
65 find_pnfs_driver(u32 id)
67 struct pnfs_layoutdriver_type *local;
69 spin_lock(&pnfs_spinlock);
70 local = find_pnfs_driver_locked(id);
71 spin_unlock(&pnfs_spinlock);
76 unset_pnfs_layoutdriver(struct nfs_server *nfss)
78 if (nfss->pnfs_curr_ld)
79 module_put(nfss->pnfs_curr_ld->owner);
80 nfss->pnfs_curr_ld = NULL;
84 * Try to set the server's pnfs module to the pnfs layout type specified by id.
85 * Currently only one pNFS layout driver per filesystem is supported.
87 * @id layout type. Zero (illegal layout type) indicates pNFS not in use.
90 set_pnfs_layoutdriver(struct nfs_server *server, u32 id)
92 struct pnfs_layoutdriver_type *ld_type = NULL;
96 if (!(server->nfs_client->cl_exchange_flags &
97 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
98 printk(KERN_ERR "%s: id %u cl_exchange_flags 0x%x\n", __func__,
99 id, server->nfs_client->cl_exchange_flags);
102 ld_type = find_pnfs_driver(id);
104 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id);
105 ld_type = find_pnfs_driver(id);
107 dprintk("%s: No pNFS module found for %u.\n",
112 if (!try_module_get(ld_type->owner)) {
113 dprintk("%s: Could not grab reference on module\n", __func__);
116 server->pnfs_curr_ld = ld_type;
118 dprintk("%s: pNFS module for %u set\n", __func__, id);
122 dprintk("%s: Using NFSv4 I/O\n", __func__);
123 server->pnfs_curr_ld = NULL;
127 pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
129 int status = -EINVAL;
130 struct pnfs_layoutdriver_type *tmp;
132 if (ld_type->id == 0) {
133 printk(KERN_ERR "%s id 0 is reserved\n", __func__);
136 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
137 printk(KERN_ERR "%s Layout driver must provide "
138 "alloc_lseg and free_lseg.\n", __func__);
142 spin_lock(&pnfs_spinlock);
143 tmp = find_pnfs_driver_locked(ld_type->id);
145 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
147 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
150 printk(KERN_ERR "%s Module with id %d already loaded!\n",
151 __func__, ld_type->id);
153 spin_unlock(&pnfs_spinlock);
157 EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
160 pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
162 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
163 spin_lock(&pnfs_spinlock);
164 list_del(&ld_type->pnfs_tblid);
165 spin_unlock(&pnfs_spinlock);
167 EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
170 * pNFS client layout cache
173 /* Need to hold i_lock if caller does not already hold reference */
175 get_layout_hdr(struct pnfs_layout_hdr *lo)
177 atomic_inc(&lo->plh_refcount);
180 static struct pnfs_layout_hdr *
181 pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
183 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
184 return ld->alloc_layout_hdr ? ld->alloc_layout_hdr(ino, gfp_flags) :
185 kzalloc(sizeof(struct pnfs_layout_hdr), gfp_flags);
189 pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
191 struct pnfs_layoutdriver_type *ld = NFS_SERVER(lo->plh_inode)->pnfs_curr_ld;
192 return ld->alloc_layout_hdr ? ld->free_layout_hdr(lo) : kfree(lo);
196 destroy_layout_hdr(struct pnfs_layout_hdr *lo)
198 dprintk("%s: freeing layout cache %p\n", __func__, lo);
199 BUG_ON(!list_empty(&lo->plh_layouts));
200 NFS_I(lo->plh_inode)->layout = NULL;
201 pnfs_free_layout_hdr(lo);
205 put_layout_hdr_locked(struct pnfs_layout_hdr *lo)
207 if (atomic_dec_and_test(&lo->plh_refcount))
208 destroy_layout_hdr(lo);
212 put_layout_hdr(struct pnfs_layout_hdr *lo)
214 struct inode *inode = lo->plh_inode;
216 if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
217 destroy_layout_hdr(lo);
218 spin_unlock(&inode->i_lock);
223 init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg)
225 INIT_LIST_HEAD(&lseg->pls_list);
226 atomic_set(&lseg->pls_refcount, 1);
228 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
229 lseg->pls_layout = lo;
232 static void free_lseg(struct pnfs_layout_segment *lseg)
234 struct inode *ino = lseg->pls_layout->plh_inode;
236 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
237 /* Matched by get_layout_hdr in pnfs_insert_layout */
238 put_layout_hdr(NFS_I(ino)->layout);
242 put_lseg_common(struct pnfs_layout_segment *lseg)
244 struct inode *inode = lseg->pls_layout->plh_inode;
246 BUG_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
247 list_del_init(&lseg->pls_list);
248 if (list_empty(&lseg->pls_layout->plh_segs)) {
249 set_bit(NFS_LAYOUT_DESTROYED, &lseg->pls_layout->plh_flags);
250 /* Matched by initial refcount set in alloc_init_layout_hdr */
251 put_layout_hdr_locked(lseg->pls_layout);
253 rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq);
257 put_lseg(struct pnfs_layout_segment *lseg)
264 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
265 atomic_read(&lseg->pls_refcount),
266 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
267 inode = lseg->pls_layout->plh_inode;
268 if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
271 put_lseg_common(lseg);
272 list_add(&lseg->pls_list, &free_me);
273 spin_unlock(&inode->i_lock);
274 pnfs_free_lseg_list(&free_me);
277 EXPORT_SYMBOL_GPL(put_lseg);
280 end_offset(u64 start, u64 len)
285 return end >= start ? end : NFS4_MAX_UINT64;
288 /* last octet in a range */
290 last_byte_offset(u64 start, u64 len)
296 return end > start ? end - 1 : NFS4_MAX_UINT64;
300 * is l2 fully contained in l1?
302 * [----------------------------------)
307 lo_seg_contained(struct pnfs_layout_range *l1,
308 struct pnfs_layout_range *l2)
310 u64 start1 = l1->offset;
311 u64 end1 = end_offset(start1, l1->length);
312 u64 start2 = l2->offset;
313 u64 end2 = end_offset(start2, l2->length);
315 return (start1 <= start2) && (end1 >= end2);
319 * is l1 and l2 intersecting?
321 * [----------------------------------)
326 lo_seg_intersecting(struct pnfs_layout_range *l1,
327 struct pnfs_layout_range *l2)
329 u64 start1 = l1->offset;
330 u64 end1 = end_offset(start1, l1->length);
331 u64 start2 = l2->offset;
332 u64 end2 = end_offset(start2, l2->length);
334 return (end1 == NFS4_MAX_UINT64 || end1 > start2) &&
335 (end2 == NFS4_MAX_UINT64 || end2 > start1);
339 should_free_lseg(struct pnfs_layout_range *lseg_range,
340 struct pnfs_layout_range *recall_range)
342 return (recall_range->iomode == IOMODE_ANY ||
343 lseg_range->iomode == recall_range->iomode) &&
344 lo_seg_intersecting(lseg_range, recall_range);
347 /* Returns 1 if lseg is removed from list, 0 otherwise */
348 static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
349 struct list_head *tmp_list)
353 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
354 /* Remove the reference keeping the lseg in the
355 * list. It will now be removed when all
356 * outstanding io is finished.
358 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
359 atomic_read(&lseg->pls_refcount));
360 if (atomic_dec_and_test(&lseg->pls_refcount)) {
361 put_lseg_common(lseg);
362 list_add(&lseg->pls_list, tmp_list);
369 /* Returns count of number of matching invalid lsegs remaining in list
373 mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
374 struct list_head *tmp_list,
375 struct pnfs_layout_range *recall_range)
377 struct pnfs_layout_segment *lseg, *next;
378 int invalid = 0, removed = 0;
380 dprintk("%s:Begin lo %p\n", __func__, lo);
382 if (list_empty(&lo->plh_segs)) {
383 if (!test_and_set_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags))
384 put_layout_hdr_locked(lo);
387 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
389 should_free_lseg(&lseg->pls_range, recall_range)) {
390 dprintk("%s: freeing lseg %p iomode %d "
391 "offset %llu length %llu\n", __func__,
392 lseg, lseg->pls_range.iomode, lseg->pls_range.offset,
393 lseg->pls_range.length);
395 removed += mark_lseg_invalid(lseg, tmp_list);
397 dprintk("%s:Return %i\n", __func__, invalid - removed);
398 return invalid - removed;
401 /* note free_me must contain lsegs from a single layout_hdr */
403 pnfs_free_lseg_list(struct list_head *free_me)
405 struct pnfs_layout_segment *lseg, *tmp;
406 struct pnfs_layout_hdr *lo;
408 if (list_empty(free_me))
411 lo = list_first_entry(free_me, struct pnfs_layout_segment,
412 pls_list)->pls_layout;
414 if (test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags)) {
415 struct nfs_client *clp;
417 clp = NFS_SERVER(lo->plh_inode)->nfs_client;
418 spin_lock(&clp->cl_lock);
419 list_del_init(&lo->plh_layouts);
420 spin_unlock(&clp->cl_lock);
422 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
423 list_del(&lseg->pls_list);
429 pnfs_destroy_layout(struct nfs_inode *nfsi)
431 struct pnfs_layout_hdr *lo;
434 spin_lock(&nfsi->vfs_inode.i_lock);
437 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
438 mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
440 spin_unlock(&nfsi->vfs_inode.i_lock);
441 pnfs_free_lseg_list(&tmp_list);
445 * Called by the state manger to remove all layouts established under an
449 pnfs_destroy_all_layouts(struct nfs_client *clp)
451 struct pnfs_layout_hdr *lo;
454 spin_lock(&clp->cl_lock);
455 list_splice_init(&clp->cl_layouts, &tmp_list);
456 spin_unlock(&clp->cl_lock);
458 while (!list_empty(&tmp_list)) {
459 lo = list_entry(tmp_list.next, struct pnfs_layout_hdr,
461 dprintk("%s freeing layout for inode %lu\n", __func__,
462 lo->plh_inode->i_ino);
463 list_del_init(&lo->plh_layouts);
464 pnfs_destroy_layout(NFS_I(lo->plh_inode));
468 /* update lo->plh_stateid with new if is more recent */
470 pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
475 oldseq = be32_to_cpu(lo->plh_stateid.stateid.seqid);
476 newseq = be32_to_cpu(new->stateid.seqid);
477 if ((int)(newseq - oldseq) > 0) {
478 memcpy(&lo->plh_stateid, &new->stateid, sizeof(new->stateid));
479 if (update_barrier) {
480 u32 new_barrier = be32_to_cpu(new->stateid.seqid);
482 if ((int)(new_barrier - lo->plh_barrier))
483 lo->plh_barrier = new_barrier;
485 /* Because of wraparound, we want to keep the barrier
486 * "close" to the current seqids. It needs to be
487 * within 2**31 to count as "behind", so if it
488 * gets too near that limit, give us a litle leeway
489 * and bring it to within 2**30.
490 * NOTE - and yes, this is all unsigned arithmetic.
492 if (unlikely((newseq - lo->plh_barrier) > (3 << 29)))
493 lo->plh_barrier = newseq - (1 << 30);
498 /* lget is set to 1 if called from inside send_layoutget call chain */
500 pnfs_layoutgets_blocked(struct pnfs_layout_hdr *lo, nfs4_stateid *stateid,
504 (int)(lo->plh_barrier - be32_to_cpu(stateid->stateid.seqid)) >= 0)
506 return lo->plh_block_lgets ||
507 test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags) ||
508 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
509 (list_empty(&lo->plh_segs) &&
510 (atomic_read(&lo->plh_outstanding) > lget));
514 pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
515 struct nfs4_state *open_state)
519 dprintk("--> %s\n", __func__);
520 spin_lock(&lo->plh_inode->i_lock);
521 if (pnfs_layoutgets_blocked(lo, NULL, 1)) {
523 } else if (list_empty(&lo->plh_segs)) {
527 seq = read_seqbegin(&open_state->seqlock);
528 memcpy(dst->data, open_state->stateid.data,
529 sizeof(open_state->stateid.data));
530 } while (read_seqretry(&open_state->seqlock, seq));
532 memcpy(dst->data, lo->plh_stateid.data, sizeof(lo->plh_stateid.data));
533 spin_unlock(&lo->plh_inode->i_lock);
534 dprintk("<-- %s\n", __func__);
539 * Get layout from server.
540 * for now, assume that whole file layouts are requested.
542 * arg->length: all ones
544 static struct pnfs_layout_segment *
545 send_layoutget(struct pnfs_layout_hdr *lo,
546 struct nfs_open_context *ctx,
547 struct pnfs_layout_range *range,
550 struct inode *ino = lo->plh_inode;
551 struct nfs_server *server = NFS_SERVER(ino);
552 struct nfs4_layoutget *lgp;
553 struct pnfs_layout_segment *lseg = NULL;
554 struct page **pages = NULL;
556 u32 max_resp_sz, max_pages;
558 dprintk("--> %s\n", __func__);
561 lgp = kzalloc(sizeof(*lgp), gfp_flags);
565 /* allocate pages for xdr post processing */
566 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
567 max_pages = max_resp_sz >> PAGE_SHIFT;
569 pages = kzalloc(max_pages * sizeof(struct page *), gfp_flags);
573 for (i = 0; i < max_pages; i++) {
574 pages[i] = alloc_page(gfp_flags);
579 lgp->args.minlength = PAGE_CACHE_SIZE;
580 if (lgp->args.minlength > range->length)
581 lgp->args.minlength = range->length;
582 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
583 lgp->args.range = *range;
584 lgp->args.type = server->pnfs_curr_ld->id;
585 lgp->args.inode = ino;
586 lgp->args.ctx = get_nfs_open_context(ctx);
587 lgp->args.layout.pages = pages;
588 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
590 lgp->gfp_flags = gfp_flags;
592 /* Synchronously retrieve layout information from server and
595 nfs4_proc_layoutget(lgp);
597 /* remember that LAYOUTGET failed and suspend trying */
598 set_bit(lo_fail_bit(range->iomode), &lo->plh_flags);
602 for (i = 0; i < max_pages; i++)
603 __free_page(pages[i]);
609 /* free any allocated xdr pages, lgp as it's not used */
611 for (i = 0; i < max_pages; i++) {
614 __free_page(pages[i]);
622 bool pnfs_roc(struct inode *ino)
624 struct pnfs_layout_hdr *lo;
625 struct pnfs_layout_segment *lseg, *tmp;
629 spin_lock(&ino->i_lock);
630 lo = NFS_I(ino)->layout;
631 if (!lo || !test_and_clear_bit(NFS_LAYOUT_ROC, &lo->plh_flags) ||
632 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
634 list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
635 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
636 mark_lseg_invalid(lseg, &tmp_list);
641 lo->plh_block_lgets++;
642 get_layout_hdr(lo); /* matched in pnfs_roc_release */
643 spin_unlock(&ino->i_lock);
644 pnfs_free_lseg_list(&tmp_list);
648 spin_unlock(&ino->i_lock);
652 void pnfs_roc_release(struct inode *ino)
654 struct pnfs_layout_hdr *lo;
656 spin_lock(&ino->i_lock);
657 lo = NFS_I(ino)->layout;
658 lo->plh_block_lgets--;
659 put_layout_hdr_locked(lo);
660 spin_unlock(&ino->i_lock);
663 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
665 struct pnfs_layout_hdr *lo;
667 spin_lock(&ino->i_lock);
668 lo = NFS_I(ino)->layout;
669 if ((int)(barrier - lo->plh_barrier) > 0)
670 lo->plh_barrier = barrier;
671 spin_unlock(&ino->i_lock);
674 bool pnfs_roc_drain(struct inode *ino, u32 *barrier)
676 struct nfs_inode *nfsi = NFS_I(ino);
677 struct pnfs_layout_segment *lseg;
680 spin_lock(&ino->i_lock);
681 list_for_each_entry(lseg, &nfsi->layout->plh_segs, pls_list)
682 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
687 struct pnfs_layout_hdr *lo = nfsi->layout;
688 u32 current_seqid = be32_to_cpu(lo->plh_stateid.stateid.seqid);
690 /* Since close does not return a layout stateid for use as
691 * a barrier, we choose the worst-case barrier.
693 *barrier = current_seqid + atomic_read(&lo->plh_outstanding);
695 spin_unlock(&ino->i_lock);
700 * Compare two layout segments for sorting into layout cache.
701 * We want to preferentially return RW over RO layouts, so ensure those
705 cmp_layout(struct pnfs_layout_range *l1,
706 struct pnfs_layout_range *l2)
710 /* high offset > low offset */
711 d = l1->offset - l2->offset;
715 /* short length > long length */
716 d = l2->length - l1->length;
720 /* read > read/write */
721 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
725 pnfs_insert_layout(struct pnfs_layout_hdr *lo,
726 struct pnfs_layout_segment *lseg)
728 struct pnfs_layout_segment *lp;
730 dprintk("%s:Begin\n", __func__);
732 assert_spin_locked(&lo->plh_inode->i_lock);
733 list_for_each_entry(lp, &lo->plh_segs, pls_list) {
734 if (cmp_layout(&lseg->pls_range, &lp->pls_range) > 0)
736 list_add_tail(&lseg->pls_list, &lp->pls_list);
737 dprintk("%s: inserted lseg %p "
738 "iomode %d offset %llu length %llu before "
739 "lp %p iomode %d offset %llu length %llu\n",
740 __func__, lseg, lseg->pls_range.iomode,
741 lseg->pls_range.offset, lseg->pls_range.length,
742 lp, lp->pls_range.iomode, lp->pls_range.offset,
743 lp->pls_range.length);
746 list_add_tail(&lseg->pls_list, &lo->plh_segs);
747 dprintk("%s: inserted lseg %p "
748 "iomode %d offset %llu length %llu at tail\n",
749 __func__, lseg, lseg->pls_range.iomode,
750 lseg->pls_range.offset, lseg->pls_range.length);
754 dprintk("%s:Return\n", __func__);
757 static struct pnfs_layout_hdr *
758 alloc_init_layout_hdr(struct inode *ino, gfp_t gfp_flags)
760 struct pnfs_layout_hdr *lo;
762 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
765 atomic_set(&lo->plh_refcount, 1);
766 INIT_LIST_HEAD(&lo->plh_layouts);
767 INIT_LIST_HEAD(&lo->plh_segs);
768 INIT_LIST_HEAD(&lo->plh_bulk_recall);
773 static struct pnfs_layout_hdr *
774 pnfs_find_alloc_layout(struct inode *ino, gfp_t gfp_flags)
776 struct nfs_inode *nfsi = NFS_I(ino);
777 struct pnfs_layout_hdr *new = NULL;
779 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
781 assert_spin_locked(&ino->i_lock);
783 if (test_bit(NFS_LAYOUT_DESTROYED, &nfsi->layout->plh_flags))
788 spin_unlock(&ino->i_lock);
789 new = alloc_init_layout_hdr(ino, gfp_flags);
790 spin_lock(&ino->i_lock);
792 if (likely(nfsi->layout == NULL)) /* Won the race? */
795 pnfs_free_layout_hdr(new);
800 * iomode matching rules:
811 is_matching_lseg(struct pnfs_layout_range *ls_range,
812 struct pnfs_layout_range *range)
814 struct pnfs_layout_range range1;
816 if ((range->iomode == IOMODE_RW &&
817 ls_range->iomode != IOMODE_RW) ||
818 !lo_seg_intersecting(ls_range, range))
821 /* range1 covers only the first byte in the range */
824 return lo_seg_contained(ls_range, &range1);
828 * lookup range in layout
830 static struct pnfs_layout_segment *
831 pnfs_find_lseg(struct pnfs_layout_hdr *lo,
832 struct pnfs_layout_range *range)
834 struct pnfs_layout_segment *lseg, *ret = NULL;
836 dprintk("%s:Begin\n", __func__);
838 assert_spin_locked(&lo->plh_inode->i_lock);
839 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
840 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
841 is_matching_lseg(&lseg->pls_range, range)) {
842 ret = get_lseg(lseg);
845 if (cmp_layout(range, &lseg->pls_range) > 0)
849 dprintk("%s:Return lseg %p ref %d\n",
850 __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
855 * Layout segment is retreived from the server if not cached.
856 * The appropriate layout segment is referenced and returned to the caller.
858 struct pnfs_layout_segment *
859 pnfs_update_layout(struct inode *ino,
860 struct nfs_open_context *ctx,
863 enum pnfs_iomode iomode,
866 struct pnfs_layout_range arg = {
872 struct nfs_inode *nfsi = NFS_I(ino);
873 struct nfs_client *clp = NFS_SERVER(ino)->nfs_client;
874 struct pnfs_layout_hdr *lo;
875 struct pnfs_layout_segment *lseg = NULL;
878 if (!pnfs_enabled_sb(NFS_SERVER(ino)))
880 spin_lock(&ino->i_lock);
881 lo = pnfs_find_alloc_layout(ino, gfp_flags);
883 dprintk("%s ERROR: can't get pnfs_layout_hdr\n", __func__);
887 /* Do we even need to bother with this? */
888 if (test_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state) ||
889 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
890 dprintk("%s matches recall, use MDS\n", __func__);
894 /* if LAYOUTGET already failed once we don't try again */
895 if (test_bit(lo_fail_bit(iomode), &nfsi->layout->plh_flags))
898 /* Check to see if the layout for the given range already exists */
899 lseg = pnfs_find_lseg(lo, &arg);
903 if (pnfs_layoutgets_blocked(lo, NULL, 0))
905 atomic_inc(&lo->plh_outstanding);
908 if (list_empty(&lo->plh_segs))
910 spin_unlock(&ino->i_lock);
912 /* The lo must be on the clp list if there is any
913 * chance of a CB_LAYOUTRECALL(FILE) coming in.
915 spin_lock(&clp->cl_lock);
916 BUG_ON(!list_empty(&lo->plh_layouts));
917 list_add_tail(&lo->plh_layouts, &clp->cl_layouts);
918 spin_unlock(&clp->cl_lock);
921 pg_offset = arg.offset & ~PAGE_CACHE_MASK;
923 arg.offset -= pg_offset;
924 arg.length += pg_offset;
926 arg.length = PAGE_CACHE_ALIGN(arg.length);
928 lseg = send_layoutget(lo, ctx, &arg, gfp_flags);
929 if (!lseg && first) {
930 spin_lock(&clp->cl_lock);
931 list_del_init(&lo->plh_layouts);
932 spin_unlock(&clp->cl_lock);
934 atomic_dec(&lo->plh_outstanding);
937 dprintk("%s end, state 0x%lx lseg %p\n", __func__,
938 nfsi->layout ? nfsi->layout->plh_flags : -1, lseg);
941 spin_unlock(&ino->i_lock);
946 pnfs_layout_process(struct nfs4_layoutget *lgp)
948 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
949 struct nfs4_layoutget_res *res = &lgp->res;
950 struct pnfs_layout_segment *lseg;
951 struct inode *ino = lo->plh_inode;
952 struct nfs_client *clp = NFS_SERVER(ino)->nfs_client;
955 /* Inject layout blob into I/O device driver */
956 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
957 if (!lseg || IS_ERR(lseg)) {
961 status = PTR_ERR(lseg);
962 dprintk("%s: Could not allocate layout: error %d\n",
967 spin_lock(&ino->i_lock);
968 if (test_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state) ||
969 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
970 dprintk("%s forget reply due to recall\n", __func__);
971 goto out_forget_reply;
974 if (pnfs_layoutgets_blocked(lo, &res->stateid, 1)) {
975 dprintk("%s forget reply due to state\n", __func__);
976 goto out_forget_reply;
979 lseg->pls_range = res->range;
980 *lgp->lsegpp = get_lseg(lseg);
981 pnfs_insert_layout(lo, lseg);
983 if (res->return_on_close) {
984 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
985 set_bit(NFS_LAYOUT_ROC, &lo->plh_flags);
988 /* Done processing layoutget. Set the layout stateid */
989 pnfs_set_layout_stateid(lo, &res->stateid, false);
990 spin_unlock(&ino->i_lock);
995 spin_unlock(&ino->i_lock);
996 lseg->pls_layout = lo;
997 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1001 static int pnfs_read_pg_test(struct nfs_pageio_descriptor *pgio,
1002 struct nfs_page *prev,
1003 struct nfs_page *req)
1005 if (pgio->pg_count == prev->wb_bytes) {
1006 /* This is first coelesce call for a series of nfs_pages */
1007 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1013 } else if (pgio->pg_lseg &&
1014 req_offset(req) > end_offset(pgio->pg_lseg->pls_range.offset,
1015 pgio->pg_lseg->pls_range.length))
1017 return NFS_SERVER(pgio->pg_inode)->pnfs_curr_ld->pg_test(pgio, prev, req);
1021 pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode)
1023 struct pnfs_layoutdriver_type *ld;
1025 ld = NFS_SERVER(inode)->pnfs_curr_ld;
1026 pgio->pg_test = (ld && ld->pg_test) ? pnfs_read_pg_test : NULL;
1029 static int pnfs_write_pg_test(struct nfs_pageio_descriptor *pgio,
1030 struct nfs_page *prev,
1031 struct nfs_page *req)
1033 if (pgio->pg_count == prev->wb_bytes) {
1034 /* This is first coelesce call for a series of nfs_pages */
1035 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1041 } else if (pgio->pg_lseg &&
1042 req_offset(req) > end_offset(pgio->pg_lseg->pls_range.offset,
1043 pgio->pg_lseg->pls_range.length))
1045 return NFS_SERVER(pgio->pg_inode)->pnfs_curr_ld->pg_test(pgio, prev, req);
1049 pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode)
1051 struct pnfs_layoutdriver_type *ld;
1053 ld = NFS_SERVER(inode)->pnfs_curr_ld;
1054 pgio->pg_test = (ld && ld->pg_test) ? pnfs_write_pg_test : NULL;
1057 enum pnfs_try_status
1058 pnfs_try_to_write_data(struct nfs_write_data *wdata,
1059 const struct rpc_call_ops *call_ops, int how)
1061 struct inode *inode = wdata->inode;
1062 enum pnfs_try_status trypnfs;
1063 struct nfs_server *nfss = NFS_SERVER(inode);
1065 wdata->mds_ops = call_ops;
1067 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
1068 inode->i_ino, wdata->args.count, wdata->args.offset, how);
1070 trypnfs = nfss->pnfs_curr_ld->write_pagelist(wdata, how);
1071 if (trypnfs == PNFS_NOT_ATTEMPTED) {
1072 put_lseg(wdata->lseg);
1075 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
1077 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
1082 * Call the appropriate parallel I/O subsystem read function.
1084 enum pnfs_try_status
1085 pnfs_try_to_read_data(struct nfs_read_data *rdata,
1086 const struct rpc_call_ops *call_ops)
1088 struct inode *inode = rdata->inode;
1089 struct nfs_server *nfss = NFS_SERVER(inode);
1090 enum pnfs_try_status trypnfs;
1092 rdata->mds_ops = call_ops;
1094 dprintk("%s: Reading ino:%lu %u@%llu\n",
1095 __func__, inode->i_ino, rdata->args.count, rdata->args.offset);
1097 trypnfs = nfss->pnfs_curr_ld->read_pagelist(rdata);
1098 if (trypnfs == PNFS_NOT_ATTEMPTED) {
1099 put_lseg(rdata->lseg);
1102 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
1104 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
1109 * Currently there is only one (whole file) write lseg.
1111 static struct pnfs_layout_segment *pnfs_list_write_lseg(struct inode *inode)
1113 struct pnfs_layout_segment *lseg, *rv = NULL;
1115 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list)
1116 if (lseg->pls_range.iomode == IOMODE_RW)
1122 pnfs_set_layoutcommit(struct nfs_write_data *wdata)
1124 struct nfs_inode *nfsi = NFS_I(wdata->inode);
1125 loff_t end_pos = wdata->args.offset + wdata->res.count;
1126 bool mark_as_dirty = false;
1128 spin_lock(&nfsi->vfs_inode.i_lock);
1129 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
1130 /* references matched in nfs4_layoutcommit_release */
1131 get_lseg(wdata->lseg);
1132 wdata->lseg->pls_lc_cred =
1133 get_rpccred(wdata->args.context->state->owner->so_cred);
1134 mark_as_dirty = true;
1135 dprintk("%s: Set layoutcommit for inode %lu ",
1136 __func__, wdata->inode->i_ino);
1138 if (end_pos > wdata->lseg->pls_end_pos)
1139 wdata->lseg->pls_end_pos = end_pos;
1140 spin_unlock(&nfsi->vfs_inode.i_lock);
1142 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
1143 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
1145 mark_inode_dirty_sync(wdata->inode);
1147 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
1150 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
1151 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
1152 * data to disk to allow the server to recover the data if it crashes.
1153 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
1154 * is off, and a COMMIT is sent to a data server, or
1155 * if WRITEs to a data server return NFS_DATA_SYNC.
1158 pnfs_layoutcommit_inode(struct inode *inode, bool sync)
1160 struct nfs4_layoutcommit_data *data;
1161 struct nfs_inode *nfsi = NFS_I(inode);
1162 struct pnfs_layout_segment *lseg;
1163 struct rpc_cred *cred;
1167 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
1169 if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1172 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
1173 data = kzalloc(sizeof(*data), GFP_NOFS);
1175 mark_inode_dirty_sync(inode);
1180 spin_lock(&inode->i_lock);
1181 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
1182 spin_unlock(&inode->i_lock);
1187 * Currently only one (whole file) write lseg which is referenced
1188 * in pnfs_set_layoutcommit and will be found.
1190 lseg = pnfs_list_write_lseg(inode);
1192 end_pos = lseg->pls_end_pos;
1193 cred = lseg->pls_lc_cred;
1194 lseg->pls_end_pos = 0;
1195 lseg->pls_lc_cred = NULL;
1197 memcpy(&data->args.stateid.data, nfsi->layout->plh_stateid.data,
1198 sizeof(nfsi->layout->plh_stateid.data));
1199 spin_unlock(&inode->i_lock);
1201 data->args.inode = inode;
1204 nfs_fattr_init(&data->fattr);
1205 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
1206 data->res.fattr = &data->fattr;
1207 data->args.lastbytewritten = end_pos - 1;
1208 data->res.server = NFS_SERVER(inode);
1210 status = nfs4_proc_layoutcommit(data, sync);
1212 dprintk("<-- %s status %d\n", __func__, status);