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
42 * protects pnfs_modules_tbl.
44 static DEFINE_SPINLOCK(pnfs_spinlock
);
47 * pnfs_modules_tbl holds all pnfs modules
49 static LIST_HEAD(pnfs_modules_tbl
);
51 /* Return the registered pnfs layout driver module matching given id */
52 static struct pnfs_layoutdriver_type
*
53 find_pnfs_driver_locked(u32 id
)
55 struct pnfs_layoutdriver_type
*local
;
57 list_for_each_entry(local
, &pnfs_modules_tbl
, pnfs_tblid
)
62 dprintk("%s: Searching for id %u, found %p\n", __func__
, id
, local
);
66 static struct pnfs_layoutdriver_type
*
67 find_pnfs_driver(u32 id
)
69 struct pnfs_layoutdriver_type
*local
;
71 spin_lock(&pnfs_spinlock
);
72 local
= find_pnfs_driver_locked(id
);
73 if (local
!= NULL
&& !try_module_get(local
->owner
)) {
74 dprintk("%s: Could not grab reference on module\n", __func__
);
77 spin_unlock(&pnfs_spinlock
);
82 unset_pnfs_layoutdriver(struct nfs_server
*nfss
)
84 if (nfss
->pnfs_curr_ld
) {
85 if (nfss
->pnfs_curr_ld
->clear_layoutdriver
)
86 nfss
->pnfs_curr_ld
->clear_layoutdriver(nfss
);
87 /* Decrement the MDS count. Purge the deviceid cache if zero */
88 if (atomic_dec_and_test(&nfss
->nfs_client
->cl_mds_count
))
89 nfs4_deviceid_purge_client(nfss
->nfs_client
);
90 module_put(nfss
->pnfs_curr_ld
->owner
);
92 nfss
->pnfs_curr_ld
= NULL
;
96 * Try to set the server's pnfs module to the pnfs layout type specified by id.
97 * Currently only one pNFS layout driver per filesystem is supported.
99 * @id layout type. Zero (illegal layout type) indicates pNFS not in use.
102 set_pnfs_layoutdriver(struct nfs_server
*server
, const struct nfs_fh
*mntfh
,
105 struct pnfs_layoutdriver_type
*ld_type
= NULL
;
109 if (!(server
->nfs_client
->cl_exchange_flags
&
110 (EXCHGID4_FLAG_USE_NON_PNFS
| EXCHGID4_FLAG_USE_PNFS_MDS
))) {
111 printk(KERN_ERR
"NFS: %s: id %u cl_exchange_flags 0x%x\n",
112 __func__
, id
, server
->nfs_client
->cl_exchange_flags
);
115 ld_type
= find_pnfs_driver(id
);
117 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX
, id
);
118 ld_type
= find_pnfs_driver(id
);
120 dprintk("%s: No pNFS module found for %u.\n",
125 server
->pnfs_curr_ld
= ld_type
;
126 if (ld_type
->set_layoutdriver
127 && ld_type
->set_layoutdriver(server
, mntfh
)) {
128 printk(KERN_ERR
"NFS: %s: Error initializing pNFS layout "
129 "driver %u.\n", __func__
, id
);
130 module_put(ld_type
->owner
);
133 /* Bump the MDS count */
134 atomic_inc(&server
->nfs_client
->cl_mds_count
);
136 dprintk("%s: pNFS module for %u set\n", __func__
, id
);
140 dprintk("%s: Using NFSv4 I/O\n", __func__
);
141 server
->pnfs_curr_ld
= NULL
;
145 pnfs_register_layoutdriver(struct pnfs_layoutdriver_type
*ld_type
)
147 int status
= -EINVAL
;
148 struct pnfs_layoutdriver_type
*tmp
;
150 if (ld_type
->id
== 0) {
151 printk(KERN_ERR
"NFS: %s id 0 is reserved\n", __func__
);
154 if (!ld_type
->alloc_lseg
|| !ld_type
->free_lseg
) {
155 printk(KERN_ERR
"NFS: %s Layout driver must provide "
156 "alloc_lseg and free_lseg.\n", __func__
);
160 spin_lock(&pnfs_spinlock
);
161 tmp
= find_pnfs_driver_locked(ld_type
->id
);
163 list_add(&ld_type
->pnfs_tblid
, &pnfs_modules_tbl
);
165 dprintk("%s Registering id:%u name:%s\n", __func__
, ld_type
->id
,
168 printk(KERN_ERR
"NFS: %s Module with id %d already loaded!\n",
169 __func__
, ld_type
->id
);
171 spin_unlock(&pnfs_spinlock
);
175 EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver
);
178 pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type
*ld_type
)
180 dprintk("%s Deregistering id:%u\n", __func__
, ld_type
->id
);
181 spin_lock(&pnfs_spinlock
);
182 list_del(&ld_type
->pnfs_tblid
);
183 spin_unlock(&pnfs_spinlock
);
185 EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver
);
188 * pNFS client layout cache
191 /* Need to hold i_lock if caller does not already hold reference */
193 get_layout_hdr(struct pnfs_layout_hdr
*lo
)
195 atomic_inc(&lo
->plh_refcount
);
198 static struct pnfs_layout_hdr
*
199 pnfs_alloc_layout_hdr(struct inode
*ino
, gfp_t gfp_flags
)
201 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(ino
)->pnfs_curr_ld
;
202 return ld
->alloc_layout_hdr
? ld
->alloc_layout_hdr(ino
, gfp_flags
) :
203 kzalloc(sizeof(struct pnfs_layout_hdr
), gfp_flags
);
207 pnfs_free_layout_hdr(struct pnfs_layout_hdr
*lo
)
209 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(lo
->plh_inode
)->pnfs_curr_ld
;
210 put_rpccred(lo
->plh_lc_cred
);
211 return ld
->alloc_layout_hdr
? ld
->free_layout_hdr(lo
) : kfree(lo
);
215 destroy_layout_hdr(struct pnfs_layout_hdr
*lo
)
217 dprintk("%s: freeing layout cache %p\n", __func__
, lo
);
218 BUG_ON(!list_empty(&lo
->plh_layouts
));
219 NFS_I(lo
->plh_inode
)->layout
= NULL
;
220 pnfs_free_layout_hdr(lo
);
224 put_layout_hdr_locked(struct pnfs_layout_hdr
*lo
)
226 if (atomic_dec_and_test(&lo
->plh_refcount
))
227 destroy_layout_hdr(lo
);
231 put_layout_hdr(struct pnfs_layout_hdr
*lo
)
233 struct inode
*inode
= lo
->plh_inode
;
235 if (atomic_dec_and_lock(&lo
->plh_refcount
, &inode
->i_lock
)) {
236 destroy_layout_hdr(lo
);
237 spin_unlock(&inode
->i_lock
);
242 init_lseg(struct pnfs_layout_hdr
*lo
, struct pnfs_layout_segment
*lseg
)
244 INIT_LIST_HEAD(&lseg
->pls_list
);
245 INIT_LIST_HEAD(&lseg
->pls_lc_list
);
246 atomic_set(&lseg
->pls_refcount
, 1);
248 set_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
);
249 lseg
->pls_layout
= lo
;
252 static void free_lseg(struct pnfs_layout_segment
*lseg
)
254 struct inode
*ino
= lseg
->pls_layout
->plh_inode
;
256 NFS_SERVER(ino
)->pnfs_curr_ld
->free_lseg(lseg
);
257 /* Matched by get_layout_hdr in pnfs_insert_layout */
258 put_layout_hdr(NFS_I(ino
)->layout
);
262 put_lseg_common(struct pnfs_layout_segment
*lseg
)
264 struct inode
*inode
= lseg
->pls_layout
->plh_inode
;
266 WARN_ON(test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
));
267 list_del_init(&lseg
->pls_list
);
268 if (list_empty(&lseg
->pls_layout
->plh_segs
)) {
269 set_bit(NFS_LAYOUT_DESTROYED
, &lseg
->pls_layout
->plh_flags
);
270 /* Matched by initial refcount set in alloc_init_layout_hdr */
271 put_layout_hdr_locked(lseg
->pls_layout
);
273 rpc_wake_up(&NFS_SERVER(inode
)->roc_rpcwaitq
);
277 put_lseg(struct pnfs_layout_segment
*lseg
)
284 dprintk("%s: lseg %p ref %d valid %d\n", __func__
, lseg
,
285 atomic_read(&lseg
->pls_refcount
),
286 test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
));
287 inode
= lseg
->pls_layout
->plh_inode
;
288 if (atomic_dec_and_lock(&lseg
->pls_refcount
, &inode
->i_lock
)) {
291 put_lseg_common(lseg
);
292 list_add(&lseg
->pls_list
, &free_me
);
293 spin_unlock(&inode
->i_lock
);
294 pnfs_free_lseg_list(&free_me
);
297 EXPORT_SYMBOL_GPL(put_lseg
);
300 end_offset(u64 start
, u64 len
)
305 return end
>= start
? end
: NFS4_MAX_UINT64
;
308 /* last octet in a range */
310 last_byte_offset(u64 start
, u64 len
)
316 return end
> start
? end
- 1 : NFS4_MAX_UINT64
;
320 * is l2 fully contained in l1?
322 * [----------------------------------)
327 lo_seg_contained(struct pnfs_layout_range
*l1
,
328 struct pnfs_layout_range
*l2
)
330 u64 start1
= l1
->offset
;
331 u64 end1
= end_offset(start1
, l1
->length
);
332 u64 start2
= l2
->offset
;
333 u64 end2
= end_offset(start2
, l2
->length
);
335 return (start1
<= start2
) && (end1
>= end2
);
339 * is l1 and l2 intersecting?
341 * [----------------------------------)
346 lo_seg_intersecting(struct pnfs_layout_range
*l1
,
347 struct pnfs_layout_range
*l2
)
349 u64 start1
= l1
->offset
;
350 u64 end1
= end_offset(start1
, l1
->length
);
351 u64 start2
= l2
->offset
;
352 u64 end2
= end_offset(start2
, l2
->length
);
354 return (end1
== NFS4_MAX_UINT64
|| end1
> start2
) &&
355 (end2
== NFS4_MAX_UINT64
|| end2
> start1
);
359 should_free_lseg(struct pnfs_layout_range
*lseg_range
,
360 struct pnfs_layout_range
*recall_range
)
362 return (recall_range
->iomode
== IOMODE_ANY
||
363 lseg_range
->iomode
== recall_range
->iomode
) &&
364 lo_seg_intersecting(lseg_range
, recall_range
);
367 /* Returns 1 if lseg is removed from list, 0 otherwise */
368 static int mark_lseg_invalid(struct pnfs_layout_segment
*lseg
,
369 struct list_head
*tmp_list
)
373 if (test_and_clear_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
)) {
374 /* Remove the reference keeping the lseg in the
375 * list. It will now be removed when all
376 * outstanding io is finished.
378 dprintk("%s: lseg %p ref %d\n", __func__
, lseg
,
379 atomic_read(&lseg
->pls_refcount
));
380 if (atomic_dec_and_test(&lseg
->pls_refcount
)) {
381 put_lseg_common(lseg
);
382 list_add(&lseg
->pls_list
, tmp_list
);
389 /* Returns count of number of matching invalid lsegs remaining in list
393 mark_matching_lsegs_invalid(struct pnfs_layout_hdr
*lo
,
394 struct list_head
*tmp_list
,
395 struct pnfs_layout_range
*recall_range
)
397 struct pnfs_layout_segment
*lseg
, *next
;
398 int invalid
= 0, removed
= 0;
400 dprintk("%s:Begin lo %p\n", __func__
, lo
);
402 if (list_empty(&lo
->plh_segs
)) {
403 /* Reset MDS Threshold I/O counters */
404 NFS_I(lo
->plh_inode
)->write_io
= 0;
405 NFS_I(lo
->plh_inode
)->read_io
= 0;
406 if (!test_and_set_bit(NFS_LAYOUT_DESTROYED
, &lo
->plh_flags
))
407 put_layout_hdr_locked(lo
);
410 list_for_each_entry_safe(lseg
, next
, &lo
->plh_segs
, pls_list
)
412 should_free_lseg(&lseg
->pls_range
, recall_range
)) {
413 dprintk("%s: freeing lseg %p iomode %d "
414 "offset %llu length %llu\n", __func__
,
415 lseg
, lseg
->pls_range
.iomode
, lseg
->pls_range
.offset
,
416 lseg
->pls_range
.length
);
418 removed
+= mark_lseg_invalid(lseg
, tmp_list
);
420 dprintk("%s:Return %i\n", __func__
, invalid
- removed
);
421 return invalid
- removed
;
424 /* note free_me must contain lsegs from a single layout_hdr */
426 pnfs_free_lseg_list(struct list_head
*free_me
)
428 struct pnfs_layout_segment
*lseg
, *tmp
;
429 struct pnfs_layout_hdr
*lo
;
431 if (list_empty(free_me
))
434 lo
= list_first_entry(free_me
, struct pnfs_layout_segment
,
435 pls_list
)->pls_layout
;
437 if (test_bit(NFS_LAYOUT_DESTROYED
, &lo
->plh_flags
)) {
438 struct nfs_client
*clp
;
440 clp
= NFS_SERVER(lo
->plh_inode
)->nfs_client
;
441 spin_lock(&clp
->cl_lock
);
442 list_del_init(&lo
->plh_layouts
);
443 spin_unlock(&clp
->cl_lock
);
445 list_for_each_entry_safe(lseg
, tmp
, free_me
, pls_list
) {
446 list_del(&lseg
->pls_list
);
452 pnfs_destroy_layout(struct nfs_inode
*nfsi
)
454 struct pnfs_layout_hdr
*lo
;
457 spin_lock(&nfsi
->vfs_inode
.i_lock
);
460 lo
->plh_block_lgets
++; /* permanently block new LAYOUTGETs */
461 mark_matching_lsegs_invalid(lo
, &tmp_list
, NULL
);
463 spin_unlock(&nfsi
->vfs_inode
.i_lock
);
464 pnfs_free_lseg_list(&tmp_list
);
466 EXPORT_SYMBOL_GPL(pnfs_destroy_layout
);
469 * Called by the state manger to remove all layouts established under an
473 pnfs_destroy_all_layouts(struct nfs_client
*clp
)
475 struct nfs_server
*server
;
476 struct pnfs_layout_hdr
*lo
;
479 nfs4_deviceid_mark_client_invalid(clp
);
480 nfs4_deviceid_purge_client(clp
);
482 spin_lock(&clp
->cl_lock
);
484 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
485 if (!list_empty(&server
->layouts
))
486 list_splice_init(&server
->layouts
, &tmp_list
);
489 spin_unlock(&clp
->cl_lock
);
491 while (!list_empty(&tmp_list
)) {
492 lo
= list_entry(tmp_list
.next
, struct pnfs_layout_hdr
,
494 dprintk("%s freeing layout for inode %lu\n", __func__
,
495 lo
->plh_inode
->i_ino
);
496 list_del_init(&lo
->plh_layouts
);
497 pnfs_destroy_layout(NFS_I(lo
->plh_inode
));
501 /* update lo->plh_stateid with new if is more recent */
503 pnfs_set_layout_stateid(struct pnfs_layout_hdr
*lo
, const nfs4_stateid
*new,
508 oldseq
= be32_to_cpu(lo
->plh_stateid
.seqid
);
509 newseq
= be32_to_cpu(new->seqid
);
510 if ((int)(newseq
- oldseq
) > 0) {
511 nfs4_stateid_copy(&lo
->plh_stateid
, new);
512 if (update_barrier
) {
513 u32 new_barrier
= be32_to_cpu(new->seqid
);
515 if ((int)(new_barrier
- lo
->plh_barrier
))
516 lo
->plh_barrier
= new_barrier
;
518 /* Because of wraparound, we want to keep the barrier
519 * "close" to the current seqids. It needs to be
520 * within 2**31 to count as "behind", so if it
521 * gets too near that limit, give us a litle leeway
522 * and bring it to within 2**30.
523 * NOTE - and yes, this is all unsigned arithmetic.
525 if (unlikely((newseq
- lo
->plh_barrier
) > (3 << 29)))
526 lo
->plh_barrier
= newseq
- (1 << 30);
531 /* lget is set to 1 if called from inside send_layoutget call chain */
533 pnfs_layoutgets_blocked(struct pnfs_layout_hdr
*lo
, nfs4_stateid
*stateid
,
537 (int)(lo
->plh_barrier
- be32_to_cpu(stateid
->seqid
)) >= 0)
539 return lo
->plh_block_lgets
||
540 test_bit(NFS_LAYOUT_DESTROYED
, &lo
->plh_flags
) ||
541 test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
) ||
542 (list_empty(&lo
->plh_segs
) &&
543 (atomic_read(&lo
->plh_outstanding
) > lget
));
547 pnfs_choose_layoutget_stateid(nfs4_stateid
*dst
, struct pnfs_layout_hdr
*lo
,
548 struct nfs4_state
*open_state
)
552 dprintk("--> %s\n", __func__
);
553 spin_lock(&lo
->plh_inode
->i_lock
);
554 if (pnfs_layoutgets_blocked(lo
, NULL
, 1)) {
556 } else if (list_empty(&lo
->plh_segs
)) {
560 seq
= read_seqbegin(&open_state
->seqlock
);
561 nfs4_stateid_copy(dst
, &open_state
->stateid
);
562 } while (read_seqretry(&open_state
->seqlock
, seq
));
564 nfs4_stateid_copy(dst
, &lo
->plh_stateid
);
565 spin_unlock(&lo
->plh_inode
->i_lock
);
566 dprintk("<-- %s\n", __func__
);
571 * Get layout from server.
572 * for now, assume that whole file layouts are requested.
574 * arg->length: all ones
576 static struct pnfs_layout_segment
*
577 send_layoutget(struct pnfs_layout_hdr
*lo
,
578 struct nfs_open_context
*ctx
,
579 struct pnfs_layout_range
*range
,
582 struct inode
*ino
= lo
->plh_inode
;
583 struct nfs_server
*server
= NFS_SERVER(ino
);
584 struct nfs4_layoutget
*lgp
;
585 struct pnfs_layout_segment
*lseg
= NULL
;
586 struct page
**pages
= NULL
;
588 u32 max_resp_sz
, max_pages
;
590 dprintk("--> %s\n", __func__
);
593 lgp
= kzalloc(sizeof(*lgp
), gfp_flags
);
597 /* allocate pages for xdr post processing */
598 max_resp_sz
= server
->nfs_client
->cl_session
->fc_attrs
.max_resp_sz
;
599 max_pages
= nfs_page_array_len(0, max_resp_sz
);
601 pages
= kcalloc(max_pages
, sizeof(struct page
*), gfp_flags
);
605 for (i
= 0; i
< max_pages
; i
++) {
606 pages
[i
] = alloc_page(gfp_flags
);
611 lgp
->args
.minlength
= PAGE_CACHE_SIZE
;
612 if (lgp
->args
.minlength
> range
->length
)
613 lgp
->args
.minlength
= range
->length
;
614 lgp
->args
.maxcount
= PNFS_LAYOUT_MAXSIZE
;
615 lgp
->args
.range
= *range
;
616 lgp
->args
.type
= server
->pnfs_curr_ld
->id
;
617 lgp
->args
.inode
= ino
;
618 lgp
->args
.ctx
= get_nfs_open_context(ctx
);
619 lgp
->args
.layout
.pages
= pages
;
620 lgp
->args
.layout
.pglen
= max_pages
* PAGE_SIZE
;
622 lgp
->gfp_flags
= gfp_flags
;
624 /* Synchronously retrieve layout information from server and
627 nfs4_proc_layoutget(lgp
);
629 /* remember that LAYOUTGET failed and suspend trying */
630 set_bit(lo_fail_bit(range
->iomode
), &lo
->plh_flags
);
634 for (i
= 0; i
< max_pages
; i
++)
635 __free_page(pages
[i
]);
641 /* free any allocated xdr pages, lgp as it's not used */
643 for (i
= 0; i
< max_pages
; i
++) {
646 __free_page(pages
[i
]);
655 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
656 * when the layout segment list is empty.
658 * Note that a pnfs_layout_hdr can exist with an empty layout segment
659 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
660 * deviceid is marked invalid.
663 _pnfs_return_layout(struct inode
*ino
)
665 struct pnfs_layout_hdr
*lo
= NULL
;
666 struct nfs_inode
*nfsi
= NFS_I(ino
);
668 struct nfs4_layoutreturn
*lrp
;
669 nfs4_stateid stateid
;
670 int status
= 0, empty
;
672 dprintk("NFS: %s for inode %lu\n", __func__
, ino
->i_ino
);
674 spin_lock(&ino
->i_lock
);
676 if (!lo
|| pnfs_test_layout_returned(lo
)) {
677 spin_unlock(&ino
->i_lock
);
678 dprintk("NFS: %s no layout to return\n", __func__
);
681 stateid
= nfsi
->layout
->plh_stateid
;
682 /* Reference matched in nfs4_layoutreturn_release */
684 empty
= list_empty(&lo
->plh_segs
);
685 mark_matching_lsegs_invalid(lo
, &tmp_list
, NULL
);
686 /* Don't send a LAYOUTRETURN if list was initially empty */
688 spin_unlock(&ino
->i_lock
);
690 dprintk("NFS: %s no layout segments to return\n", __func__
);
693 lo
->plh_block_lgets
++;
694 pnfs_mark_layout_returned(lo
);
695 spin_unlock(&ino
->i_lock
);
696 pnfs_free_lseg_list(&tmp_list
);
698 WARN_ON(test_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
));
700 lrp
= kzalloc(sizeof(*lrp
), GFP_KERNEL
);
701 if (unlikely(lrp
== NULL
)) {
703 set_bit(NFS_LAYOUT_RW_FAILED
, &lo
->plh_flags
);
704 set_bit(NFS_LAYOUT_RO_FAILED
, &lo
->plh_flags
);
705 pnfs_clear_layout_returned(lo
);
710 lrp
->args
.stateid
= stateid
;
711 lrp
->args
.layout_type
= NFS_SERVER(ino
)->pnfs_curr_ld
->id
;
712 lrp
->args
.inode
= ino
;
713 lrp
->args
.layout
= lo
;
714 lrp
->clp
= NFS_SERVER(ino
)->nfs_client
;
716 status
= nfs4_proc_layoutreturn(lrp
);
718 dprintk("<-- %s status: %d\n", __func__
, status
);
721 EXPORT_SYMBOL_GPL(_pnfs_return_layout
);
723 bool pnfs_roc(struct inode
*ino
)
725 struct pnfs_layout_hdr
*lo
;
726 struct pnfs_layout_segment
*lseg
, *tmp
;
730 spin_lock(&ino
->i_lock
);
731 lo
= NFS_I(ino
)->layout
;
732 if (!lo
|| !test_and_clear_bit(NFS_LAYOUT_ROC
, &lo
->plh_flags
) ||
733 test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
))
735 list_for_each_entry_safe(lseg
, tmp
, &lo
->plh_segs
, pls_list
)
736 if (test_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
)) {
737 mark_lseg_invalid(lseg
, &tmp_list
);
742 lo
->plh_block_lgets
++;
743 get_layout_hdr(lo
); /* matched in pnfs_roc_release */
744 spin_unlock(&ino
->i_lock
);
745 pnfs_free_lseg_list(&tmp_list
);
749 spin_unlock(&ino
->i_lock
);
753 void pnfs_roc_release(struct inode
*ino
)
755 struct pnfs_layout_hdr
*lo
;
757 spin_lock(&ino
->i_lock
);
758 lo
= NFS_I(ino
)->layout
;
759 lo
->plh_block_lgets
--;
760 put_layout_hdr_locked(lo
);
761 spin_unlock(&ino
->i_lock
);
764 void pnfs_roc_set_barrier(struct inode
*ino
, u32 barrier
)
766 struct pnfs_layout_hdr
*lo
;
768 spin_lock(&ino
->i_lock
);
769 lo
= NFS_I(ino
)->layout
;
770 if ((int)(barrier
- lo
->plh_barrier
) > 0)
771 lo
->plh_barrier
= barrier
;
772 spin_unlock(&ino
->i_lock
);
775 bool pnfs_roc_drain(struct inode
*ino
, u32
*barrier
)
777 struct nfs_inode
*nfsi
= NFS_I(ino
);
778 struct pnfs_layout_segment
*lseg
;
781 spin_lock(&ino
->i_lock
);
782 list_for_each_entry(lseg
, &nfsi
->layout
->plh_segs
, pls_list
)
783 if (test_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
)) {
788 struct pnfs_layout_hdr
*lo
= nfsi
->layout
;
789 u32 current_seqid
= be32_to_cpu(lo
->plh_stateid
.seqid
);
791 /* Since close does not return a layout stateid for use as
792 * a barrier, we choose the worst-case barrier.
794 *barrier
= current_seqid
+ atomic_read(&lo
->plh_outstanding
);
796 spin_unlock(&ino
->i_lock
);
801 * Compare two layout segments for sorting into layout cache.
802 * We want to preferentially return RW over RO layouts, so ensure those
806 cmp_layout(struct pnfs_layout_range
*l1
,
807 struct pnfs_layout_range
*l2
)
811 /* high offset > low offset */
812 d
= l1
->offset
- l2
->offset
;
816 /* short length > long length */
817 d
= l2
->length
- l1
->length
;
821 /* read > read/write */
822 return (int)(l1
->iomode
== IOMODE_READ
) - (int)(l2
->iomode
== IOMODE_READ
);
826 pnfs_insert_layout(struct pnfs_layout_hdr
*lo
,
827 struct pnfs_layout_segment
*lseg
)
829 struct pnfs_layout_segment
*lp
;
831 dprintk("%s:Begin\n", __func__
);
833 assert_spin_locked(&lo
->plh_inode
->i_lock
);
834 list_for_each_entry(lp
, &lo
->plh_segs
, pls_list
) {
835 if (cmp_layout(&lseg
->pls_range
, &lp
->pls_range
) > 0)
837 list_add_tail(&lseg
->pls_list
, &lp
->pls_list
);
838 dprintk("%s: inserted lseg %p "
839 "iomode %d offset %llu length %llu before "
840 "lp %p iomode %d offset %llu length %llu\n",
841 __func__
, lseg
, lseg
->pls_range
.iomode
,
842 lseg
->pls_range
.offset
, lseg
->pls_range
.length
,
843 lp
, lp
->pls_range
.iomode
, lp
->pls_range
.offset
,
844 lp
->pls_range
.length
);
847 list_add_tail(&lseg
->pls_list
, &lo
->plh_segs
);
848 dprintk("%s: inserted lseg %p "
849 "iomode %d offset %llu length %llu at tail\n",
850 __func__
, lseg
, lseg
->pls_range
.iomode
,
851 lseg
->pls_range
.offset
, lseg
->pls_range
.length
);
855 dprintk("%s:Return\n", __func__
);
858 static struct pnfs_layout_hdr
*
859 alloc_init_layout_hdr(struct inode
*ino
,
860 struct nfs_open_context
*ctx
,
863 struct pnfs_layout_hdr
*lo
;
865 lo
= pnfs_alloc_layout_hdr(ino
, gfp_flags
);
868 atomic_set(&lo
->plh_refcount
, 1);
869 INIT_LIST_HEAD(&lo
->plh_layouts
);
870 INIT_LIST_HEAD(&lo
->plh_segs
);
871 INIT_LIST_HEAD(&lo
->plh_bulk_recall
);
873 lo
->plh_lc_cred
= get_rpccred(ctx
->state
->owner
->so_cred
);
877 static struct pnfs_layout_hdr
*
878 pnfs_find_alloc_layout(struct inode
*ino
,
879 struct nfs_open_context
*ctx
,
882 struct nfs_inode
*nfsi
= NFS_I(ino
);
883 struct pnfs_layout_hdr
*new = NULL
;
885 dprintk("%s Begin ino=%p layout=%p\n", __func__
, ino
, nfsi
->layout
);
887 assert_spin_locked(&ino
->i_lock
);
889 if (test_bit(NFS_LAYOUT_DESTROYED
, &nfsi
->layout
->plh_flags
))
894 spin_unlock(&ino
->i_lock
);
895 new = alloc_init_layout_hdr(ino
, ctx
, gfp_flags
);
896 spin_lock(&ino
->i_lock
);
898 if (likely(nfsi
->layout
== NULL
)) /* Won the race? */
901 pnfs_free_layout_hdr(new);
906 * iomode matching rules:
917 is_matching_lseg(struct pnfs_layout_range
*ls_range
,
918 struct pnfs_layout_range
*range
)
920 struct pnfs_layout_range range1
;
922 if ((range
->iomode
== IOMODE_RW
&&
923 ls_range
->iomode
!= IOMODE_RW
) ||
924 !lo_seg_intersecting(ls_range
, range
))
927 /* range1 covers only the first byte in the range */
930 return lo_seg_contained(ls_range
, &range1
);
934 * lookup range in layout
936 static struct pnfs_layout_segment
*
937 pnfs_find_lseg(struct pnfs_layout_hdr
*lo
,
938 struct pnfs_layout_range
*range
)
940 struct pnfs_layout_segment
*lseg
, *ret
= NULL
;
942 dprintk("%s:Begin\n", __func__
);
944 assert_spin_locked(&lo
->plh_inode
->i_lock
);
945 list_for_each_entry(lseg
, &lo
->plh_segs
, pls_list
) {
946 if (test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
) &&
947 is_matching_lseg(&lseg
->pls_range
, range
)) {
948 ret
= get_lseg(lseg
);
951 if (lseg
->pls_range
.offset
> range
->offset
)
955 dprintk("%s:Return lseg %p ref %d\n",
956 __func__
, ret
, ret
? atomic_read(&ret
->pls_refcount
) : 0);
961 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
962 * to the MDS or over pNFS
964 * The nfs_inode read_io and write_io fields are cumulative counters reset
965 * when there are no layout segments. Note that in pnfs_update_layout iomode
966 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
969 * A return of true means use MDS I/O.
972 * If a file's size is smaller than the file size threshold, data accesses
973 * SHOULD be sent to the metadata server. If an I/O request has a length that
974 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
975 * server. If both file size and I/O size are provided, the client SHOULD
976 * reach or exceed both thresholds before sending its read or write
977 * requests to the data server.
979 static bool pnfs_within_mdsthreshold(struct nfs_open_context
*ctx
,
980 struct inode
*ino
, int iomode
)
982 struct nfs4_threshold
*t
= ctx
->mdsthreshold
;
983 struct nfs_inode
*nfsi
= NFS_I(ino
);
984 loff_t fsize
= i_size_read(ino
);
985 bool size
= false, size_set
= false, io
= false, io_set
= false, ret
= false;
990 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
991 __func__
, t
->bm
, t
->rd_sz
, t
->wr_sz
, t
->rd_io_sz
, t
->wr_io_sz
);
995 if (t
->bm
& THRESHOLD_RD
) {
996 dprintk("%s fsize %llu\n", __func__
, fsize
);
998 if (fsize
< t
->rd_sz
)
1001 if (t
->bm
& THRESHOLD_RD_IO
) {
1002 dprintk("%s nfsi->read_io %llu\n", __func__
,
1005 if (nfsi
->read_io
< t
->rd_io_sz
)
1010 if (t
->bm
& THRESHOLD_WR
) {
1011 dprintk("%s fsize %llu\n", __func__
, fsize
);
1013 if (fsize
< t
->wr_sz
)
1016 if (t
->bm
& THRESHOLD_WR_IO
) {
1017 dprintk("%s nfsi->write_io %llu\n", __func__
,
1020 if (nfsi
->write_io
< t
->wr_io_sz
)
1025 if (size_set
&& io_set
) {
1028 } else if (size
|| io
)
1031 dprintk("<-- %s size %d io %d ret %d\n", __func__
, size
, io
, ret
);
1036 * Layout segment is retreived from the server if not cached.
1037 * The appropriate layout segment is referenced and returned to the caller.
1039 struct pnfs_layout_segment
*
1040 pnfs_update_layout(struct inode
*ino
,
1041 struct nfs_open_context
*ctx
,
1044 enum pnfs_iomode iomode
,
1047 struct pnfs_layout_range arg
= {
1053 struct nfs_inode
*nfsi
= NFS_I(ino
);
1054 struct nfs_server
*server
= NFS_SERVER(ino
);
1055 struct nfs_client
*clp
= server
->nfs_client
;
1056 struct pnfs_layout_hdr
*lo
;
1057 struct pnfs_layout_segment
*lseg
= NULL
;
1060 if (!pnfs_enabled_sb(NFS_SERVER(ino
)))
1063 if (pnfs_within_mdsthreshold(ctx
, ino
, iomode
))
1066 spin_lock(&ino
->i_lock
);
1067 lo
= pnfs_find_alloc_layout(ino
, ctx
, gfp_flags
);
1069 dprintk("%s ERROR: can't get pnfs_layout_hdr\n", __func__
);
1073 /* Do we even need to bother with this? */
1074 if (test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
)) {
1075 dprintk("%s matches recall, use MDS\n", __func__
);
1079 /* if LAYOUTGET already failed once we don't try again */
1080 if (test_bit(lo_fail_bit(iomode
), &nfsi
->layout
->plh_flags
))
1083 /* Check to see if the layout for the given range already exists */
1084 lseg
= pnfs_find_lseg(lo
, &arg
);
1088 if (pnfs_layoutgets_blocked(lo
, NULL
, 0))
1090 atomic_inc(&lo
->plh_outstanding
);
1093 if (list_empty(&lo
->plh_segs
))
1096 /* Enable LAYOUTRETURNs */
1097 pnfs_clear_layout_returned(lo
);
1099 spin_unlock(&ino
->i_lock
);
1101 /* The lo must be on the clp list if there is any
1102 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1104 spin_lock(&clp
->cl_lock
);
1105 BUG_ON(!list_empty(&lo
->plh_layouts
));
1106 list_add_tail(&lo
->plh_layouts
, &server
->layouts
);
1107 spin_unlock(&clp
->cl_lock
);
1110 pg_offset
= arg
.offset
& ~PAGE_CACHE_MASK
;
1112 arg
.offset
-= pg_offset
;
1113 arg
.length
+= pg_offset
;
1115 if (arg
.length
!= NFS4_MAX_UINT64
)
1116 arg
.length
= PAGE_CACHE_ALIGN(arg
.length
);
1118 lseg
= send_layoutget(lo
, ctx
, &arg
, gfp_flags
);
1119 if (!lseg
&& first
) {
1120 spin_lock(&clp
->cl_lock
);
1121 list_del_init(&lo
->plh_layouts
);
1122 spin_unlock(&clp
->cl_lock
);
1124 atomic_dec(&lo
->plh_outstanding
);
1127 dprintk("%s end, state 0x%lx lseg %p\n", __func__
,
1128 nfsi
->layout
? nfsi
->layout
->plh_flags
: -1, lseg
);
1131 spin_unlock(&ino
->i_lock
);
1134 EXPORT_SYMBOL_GPL(pnfs_update_layout
);
1137 pnfs_layout_process(struct nfs4_layoutget
*lgp
)
1139 struct pnfs_layout_hdr
*lo
= NFS_I(lgp
->args
.inode
)->layout
;
1140 struct nfs4_layoutget_res
*res
= &lgp
->res
;
1141 struct pnfs_layout_segment
*lseg
;
1142 struct inode
*ino
= lo
->plh_inode
;
1145 /* Inject layout blob into I/O device driver */
1146 lseg
= NFS_SERVER(ino
)->pnfs_curr_ld
->alloc_lseg(lo
, res
, lgp
->gfp_flags
);
1147 if (!lseg
|| IS_ERR(lseg
)) {
1151 status
= PTR_ERR(lseg
);
1152 dprintk("%s: Could not allocate layout: error %d\n",
1157 spin_lock(&ino
->i_lock
);
1158 if (test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
)) {
1159 dprintk("%s forget reply due to recall\n", __func__
);
1160 goto out_forget_reply
;
1163 if (pnfs_layoutgets_blocked(lo
, &res
->stateid
, 1)) {
1164 dprintk("%s forget reply due to state\n", __func__
);
1165 goto out_forget_reply
;
1167 init_lseg(lo
, lseg
);
1168 lseg
->pls_range
= res
->range
;
1169 *lgp
->lsegpp
= get_lseg(lseg
);
1170 pnfs_insert_layout(lo
, lseg
);
1172 if (res
->return_on_close
) {
1173 set_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
);
1174 set_bit(NFS_LAYOUT_ROC
, &lo
->plh_flags
);
1177 /* Done processing layoutget. Set the layout stateid */
1178 pnfs_set_layout_stateid(lo
, &res
->stateid
, false);
1179 spin_unlock(&ino
->i_lock
);
1184 spin_unlock(&ino
->i_lock
);
1185 lseg
->pls_layout
= lo
;
1186 NFS_SERVER(ino
)->pnfs_curr_ld
->free_lseg(lseg
);
1191 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*req
)
1193 BUG_ON(pgio
->pg_lseg
!= NULL
);
1195 if (req
->wb_offset
!= req
->wb_pgbase
) {
1196 nfs_pageio_reset_read_mds(pgio
);
1199 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
1205 /* If no lseg, fall back to read through mds */
1206 if (pgio
->pg_lseg
== NULL
)
1207 nfs_pageio_reset_read_mds(pgio
);
1210 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read
);
1213 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*req
)
1215 BUG_ON(pgio
->pg_lseg
!= NULL
);
1217 if (req
->wb_offset
!= req
->wb_pgbase
) {
1218 nfs_pageio_reset_write_mds(pgio
);
1221 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
1227 /* If no lseg, fall back to write through mds */
1228 if (pgio
->pg_lseg
== NULL
)
1229 nfs_pageio_reset_write_mds(pgio
);
1231 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write
);
1234 pnfs_pageio_init_read(struct nfs_pageio_descriptor
*pgio
, struct inode
*inode
,
1235 const struct nfs_pgio_completion_ops
*compl_ops
)
1237 struct nfs_server
*server
= NFS_SERVER(inode
);
1238 struct pnfs_layoutdriver_type
*ld
= server
->pnfs_curr_ld
;
1241 nfs_pageio_init_read(pgio
, inode
, compl_ops
);
1243 nfs_pageio_init(pgio
, inode
, ld
->pg_read_ops
, compl_ops
, server
->rsize
, 0);
1247 pnfs_pageio_init_write(struct nfs_pageio_descriptor
*pgio
, struct inode
*inode
,
1249 const struct nfs_pgio_completion_ops
*compl_ops
)
1251 struct nfs_server
*server
= NFS_SERVER(inode
);
1252 struct pnfs_layoutdriver_type
*ld
= server
->pnfs_curr_ld
;
1255 nfs_pageio_init_write(pgio
, inode
, ioflags
, compl_ops
);
1257 nfs_pageio_init(pgio
, inode
, ld
->pg_write_ops
, compl_ops
, server
->wsize
, ioflags
);
1261 pnfs_generic_pg_test(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*prev
,
1262 struct nfs_page
*req
)
1264 if (pgio
->pg_lseg
== NULL
)
1265 return nfs_generic_pg_test(pgio
, prev
, req
);
1268 * Test if a nfs_page is fully contained in the pnfs_layout_range.
1269 * Note that this test makes several assumptions:
1270 * - that the previous nfs_page in the struct nfs_pageio_descriptor
1271 * is known to lie within the range.
1272 * - that the nfs_page being tested is known to be contiguous with the
1273 * previous nfs_page.
1274 * - Layout ranges are page aligned, so we only have to test the
1275 * start offset of the request.
1277 * Please also note that 'end_offset' is actually the offset of the
1278 * first byte that lies outside the pnfs_layout_range. FIXME?
1281 return req_offset(req
) < end_offset(pgio
->pg_lseg
->pls_range
.offset
,
1282 pgio
->pg_lseg
->pls_range
.length
);
1284 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test
);
1286 int pnfs_write_done_resend_to_mds(struct inode
*inode
,
1287 struct list_head
*head
,
1288 const struct nfs_pgio_completion_ops
*compl_ops
)
1290 struct nfs_pageio_descriptor pgio
;
1293 /* Resend all requests through the MDS */
1294 nfs_pageio_init_write(&pgio
, inode
, FLUSH_STABLE
, compl_ops
);
1295 while (!list_empty(head
)) {
1296 struct nfs_page
*req
= nfs_list_entry(head
->next
);
1298 nfs_list_remove_request(req
);
1299 if (!nfs_pageio_add_request(&pgio
, req
))
1300 nfs_list_add_request(req
, &failed
);
1302 nfs_pageio_complete(&pgio
);
1304 if (!list_empty(&failed
)) {
1305 /* For some reason our attempt to resend pages. Mark the
1306 * overall send request as having failed, and let
1307 * nfs_writeback_release_full deal with the error.
1309 list_move(&failed
, head
);
1314 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds
);
1316 static void pnfs_ld_handle_write_error(struct nfs_write_data
*data
)
1318 struct nfs_pgio_header
*hdr
= data
->header
;
1320 dprintk("pnfs write error = %d\n", hdr
->pnfs_error
);
1321 if (NFS_SERVER(hdr
->inode
)->pnfs_curr_ld
->flags
&
1322 PNFS_LAYOUTRET_ON_ERROR
) {
1323 clear_bit(NFS_INO_LAYOUTCOMMIT
, &NFS_I(hdr
->inode
)->flags
);
1324 pnfs_return_layout(hdr
->inode
);
1326 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
))
1327 data
->task
.tk_status
= pnfs_write_done_resend_to_mds(hdr
->inode
,
1329 hdr
->completion_ops
);
1333 * Called by non rpc-based layout drivers
1335 void pnfs_ld_write_done(struct nfs_write_data
*data
)
1337 struct nfs_pgio_header
*hdr
= data
->header
;
1339 if (!hdr
->pnfs_error
) {
1340 pnfs_set_layoutcommit(data
);
1341 hdr
->mds_ops
->rpc_call_done(&data
->task
, data
);
1343 pnfs_ld_handle_write_error(data
);
1344 hdr
->mds_ops
->rpc_release(data
);
1346 EXPORT_SYMBOL_GPL(pnfs_ld_write_done
);
1349 pnfs_write_through_mds(struct nfs_pageio_descriptor
*desc
,
1350 struct nfs_write_data
*data
)
1352 struct nfs_pgio_header
*hdr
= data
->header
;
1354 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
1355 list_splice_tail_init(&hdr
->pages
, &desc
->pg_list
);
1356 nfs_pageio_reset_write_mds(desc
);
1357 desc
->pg_recoalesce
= 1;
1359 nfs_writedata_release(data
);
1362 static enum pnfs_try_status
1363 pnfs_try_to_write_data(struct nfs_write_data
*wdata
,
1364 const struct rpc_call_ops
*call_ops
,
1365 struct pnfs_layout_segment
*lseg
,
1368 struct nfs_pgio_header
*hdr
= wdata
->header
;
1369 struct inode
*inode
= hdr
->inode
;
1370 enum pnfs_try_status trypnfs
;
1371 struct nfs_server
*nfss
= NFS_SERVER(inode
);
1373 hdr
->mds_ops
= call_ops
;
1375 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__
,
1376 inode
->i_ino
, wdata
->args
.count
, wdata
->args
.offset
, how
);
1377 trypnfs
= nfss
->pnfs_curr_ld
->write_pagelist(wdata
, how
);
1378 if (trypnfs
!= PNFS_NOT_ATTEMPTED
)
1379 nfs_inc_stats(inode
, NFSIOS_PNFS_WRITE
);
1380 dprintk("%s End (trypnfs:%d)\n", __func__
, trypnfs
);
1385 pnfs_do_multiple_writes(struct nfs_pageio_descriptor
*desc
, struct list_head
*head
, int how
)
1387 struct nfs_write_data
*data
;
1388 const struct rpc_call_ops
*call_ops
= desc
->pg_rpc_callops
;
1389 struct pnfs_layout_segment
*lseg
= desc
->pg_lseg
;
1391 desc
->pg_lseg
= NULL
;
1392 while (!list_empty(head
)) {
1393 enum pnfs_try_status trypnfs
;
1395 data
= list_first_entry(head
, struct nfs_write_data
, list
);
1396 list_del_init(&data
->list
);
1398 trypnfs
= pnfs_try_to_write_data(data
, call_ops
, lseg
, how
);
1399 if (trypnfs
== PNFS_NOT_ATTEMPTED
)
1400 pnfs_write_through_mds(desc
, data
);
1405 static void pnfs_writehdr_free(struct nfs_pgio_header
*hdr
)
1407 put_lseg(hdr
->lseg
);
1408 nfs_writehdr_free(hdr
);
1412 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor
*desc
)
1414 struct nfs_write_header
*whdr
;
1415 struct nfs_pgio_header
*hdr
;
1418 whdr
= nfs_writehdr_alloc();
1420 desc
->pg_completion_ops
->error_cleanup(&desc
->pg_list
);
1421 put_lseg(desc
->pg_lseg
);
1422 desc
->pg_lseg
= NULL
;
1425 hdr
= &whdr
->header
;
1426 nfs_pgheader_init(desc
, hdr
, pnfs_writehdr_free
);
1427 hdr
->lseg
= get_lseg(desc
->pg_lseg
);
1428 atomic_inc(&hdr
->refcnt
);
1429 ret
= nfs_generic_flush(desc
, hdr
);
1431 put_lseg(desc
->pg_lseg
);
1432 desc
->pg_lseg
= NULL
;
1434 pnfs_do_multiple_writes(desc
, &hdr
->rpc_list
, desc
->pg_ioflags
);
1435 if (atomic_dec_and_test(&hdr
->refcnt
))
1436 hdr
->completion_ops
->completion(hdr
);
1439 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages
);
1441 int pnfs_read_done_resend_to_mds(struct inode
*inode
,
1442 struct list_head
*head
,
1443 const struct nfs_pgio_completion_ops
*compl_ops
)
1445 struct nfs_pageio_descriptor pgio
;
1448 /* Resend all requests through the MDS */
1449 nfs_pageio_init_read(&pgio
, inode
, compl_ops
);
1450 while (!list_empty(head
)) {
1451 struct nfs_page
*req
= nfs_list_entry(head
->next
);
1453 nfs_list_remove_request(req
);
1454 if (!nfs_pageio_add_request(&pgio
, req
))
1455 nfs_list_add_request(req
, &failed
);
1457 nfs_pageio_complete(&pgio
);
1459 if (!list_empty(&failed
)) {
1460 list_move(&failed
, head
);
1465 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds
);
1467 static void pnfs_ld_handle_read_error(struct nfs_read_data
*data
)
1469 struct nfs_pgio_header
*hdr
= data
->header
;
1471 dprintk("pnfs read error = %d\n", hdr
->pnfs_error
);
1472 if (NFS_SERVER(hdr
->inode
)->pnfs_curr_ld
->flags
&
1473 PNFS_LAYOUTRET_ON_ERROR
) {
1474 clear_bit(NFS_INO_LAYOUTCOMMIT
, &NFS_I(hdr
->inode
)->flags
);
1475 pnfs_return_layout(hdr
->inode
);
1477 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
))
1478 data
->task
.tk_status
= pnfs_read_done_resend_to_mds(hdr
->inode
,
1480 hdr
->completion_ops
);
1484 * Called by non rpc-based layout drivers
1486 void pnfs_ld_read_done(struct nfs_read_data
*data
)
1488 struct nfs_pgio_header
*hdr
= data
->header
;
1490 if (likely(!hdr
->pnfs_error
)) {
1491 __nfs4_read_done_cb(data
);
1492 hdr
->mds_ops
->rpc_call_done(&data
->task
, data
);
1494 pnfs_ld_handle_read_error(data
);
1495 hdr
->mds_ops
->rpc_release(data
);
1497 EXPORT_SYMBOL_GPL(pnfs_ld_read_done
);
1500 pnfs_read_through_mds(struct nfs_pageio_descriptor
*desc
,
1501 struct nfs_read_data
*data
)
1503 struct nfs_pgio_header
*hdr
= data
->header
;
1505 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
1506 list_splice_tail_init(&hdr
->pages
, &desc
->pg_list
);
1507 nfs_pageio_reset_read_mds(desc
);
1508 desc
->pg_recoalesce
= 1;
1510 nfs_readdata_release(data
);
1514 * Call the appropriate parallel I/O subsystem read function.
1516 static enum pnfs_try_status
1517 pnfs_try_to_read_data(struct nfs_read_data
*rdata
,
1518 const struct rpc_call_ops
*call_ops
,
1519 struct pnfs_layout_segment
*lseg
)
1521 struct nfs_pgio_header
*hdr
= rdata
->header
;
1522 struct inode
*inode
= hdr
->inode
;
1523 struct nfs_server
*nfss
= NFS_SERVER(inode
);
1524 enum pnfs_try_status trypnfs
;
1526 hdr
->mds_ops
= call_ops
;
1528 dprintk("%s: Reading ino:%lu %u@%llu\n",
1529 __func__
, inode
->i_ino
, rdata
->args
.count
, rdata
->args
.offset
);
1531 trypnfs
= nfss
->pnfs_curr_ld
->read_pagelist(rdata
);
1532 if (trypnfs
!= PNFS_NOT_ATTEMPTED
)
1533 nfs_inc_stats(inode
, NFSIOS_PNFS_READ
);
1534 dprintk("%s End (trypnfs:%d)\n", __func__
, trypnfs
);
1539 pnfs_do_multiple_reads(struct nfs_pageio_descriptor
*desc
, struct list_head
*head
)
1541 struct nfs_read_data
*data
;
1542 const struct rpc_call_ops
*call_ops
= desc
->pg_rpc_callops
;
1543 struct pnfs_layout_segment
*lseg
= desc
->pg_lseg
;
1545 desc
->pg_lseg
= NULL
;
1546 while (!list_empty(head
)) {
1547 enum pnfs_try_status trypnfs
;
1549 data
= list_first_entry(head
, struct nfs_read_data
, list
);
1550 list_del_init(&data
->list
);
1552 trypnfs
= pnfs_try_to_read_data(data
, call_ops
, lseg
);
1553 if (trypnfs
== PNFS_NOT_ATTEMPTED
)
1554 pnfs_read_through_mds(desc
, data
);
1559 static void pnfs_readhdr_free(struct nfs_pgio_header
*hdr
)
1561 put_lseg(hdr
->lseg
);
1562 nfs_readhdr_free(hdr
);
1566 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor
*desc
)
1568 struct nfs_read_header
*rhdr
;
1569 struct nfs_pgio_header
*hdr
;
1572 rhdr
= nfs_readhdr_alloc();
1574 desc
->pg_completion_ops
->error_cleanup(&desc
->pg_list
);
1576 put_lseg(desc
->pg_lseg
);
1577 desc
->pg_lseg
= NULL
;
1580 hdr
= &rhdr
->header
;
1581 nfs_pgheader_init(desc
, hdr
, pnfs_readhdr_free
);
1582 hdr
->lseg
= get_lseg(desc
->pg_lseg
);
1583 atomic_inc(&hdr
->refcnt
);
1584 ret
= nfs_generic_pagein(desc
, hdr
);
1586 put_lseg(desc
->pg_lseg
);
1587 desc
->pg_lseg
= NULL
;
1589 pnfs_do_multiple_reads(desc
, &hdr
->rpc_list
);
1590 if (atomic_dec_and_test(&hdr
->refcnt
))
1591 hdr
->completion_ops
->completion(hdr
);
1594 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages
);
1597 * There can be multiple RW segments.
1599 static void pnfs_list_write_lseg(struct inode
*inode
, struct list_head
*listp
)
1601 struct pnfs_layout_segment
*lseg
;
1603 list_for_each_entry(lseg
, &NFS_I(inode
)->layout
->plh_segs
, pls_list
) {
1604 if (lseg
->pls_range
.iomode
== IOMODE_RW
&&
1605 test_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
))
1606 list_add(&lseg
->pls_lc_list
, listp
);
1610 void pnfs_set_lo_fail(struct pnfs_layout_segment
*lseg
)
1612 if (lseg
->pls_range
.iomode
== IOMODE_RW
) {
1613 dprintk("%s Setting layout IOMODE_RW fail bit\n", __func__
);
1614 set_bit(lo_fail_bit(IOMODE_RW
), &lseg
->pls_layout
->plh_flags
);
1616 dprintk("%s Setting layout IOMODE_READ fail bit\n", __func__
);
1617 set_bit(lo_fail_bit(IOMODE_READ
), &lseg
->pls_layout
->plh_flags
);
1620 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail
);
1623 pnfs_set_layoutcommit(struct nfs_write_data
*wdata
)
1625 struct nfs_pgio_header
*hdr
= wdata
->header
;
1626 struct inode
*inode
= hdr
->inode
;
1627 struct nfs_inode
*nfsi
= NFS_I(inode
);
1628 loff_t end_pos
= wdata
->mds_offset
+ wdata
->res
.count
;
1629 bool mark_as_dirty
= false;
1631 spin_lock(&inode
->i_lock
);
1632 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
)) {
1633 mark_as_dirty
= true;
1634 dprintk("%s: Set layoutcommit for inode %lu ",
1635 __func__
, inode
->i_ino
);
1637 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT
, &hdr
->lseg
->pls_flags
)) {
1638 /* references matched in nfs4_layoutcommit_release */
1639 get_lseg(hdr
->lseg
);
1641 if (end_pos
> nfsi
->layout
->plh_lwb
)
1642 nfsi
->layout
->plh_lwb
= end_pos
;
1643 spin_unlock(&inode
->i_lock
);
1644 dprintk("%s: lseg %p end_pos %llu\n",
1645 __func__
, hdr
->lseg
, nfsi
->layout
->plh_lwb
);
1647 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
1648 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
1650 mark_inode_dirty_sync(inode
);
1652 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit
);
1654 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data
*data
)
1656 struct nfs_server
*nfss
= NFS_SERVER(data
->args
.inode
);
1658 if (nfss
->pnfs_curr_ld
->cleanup_layoutcommit
)
1659 nfss
->pnfs_curr_ld
->cleanup_layoutcommit(data
);
1663 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
1664 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
1665 * data to disk to allow the server to recover the data if it crashes.
1666 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
1667 * is off, and a COMMIT is sent to a data server, or
1668 * if WRITEs to a data server return NFS_DATA_SYNC.
1671 pnfs_layoutcommit_inode(struct inode
*inode
, bool sync
)
1673 struct nfs4_layoutcommit_data
*data
;
1674 struct nfs_inode
*nfsi
= NFS_I(inode
);
1678 dprintk("--> %s inode %lu\n", __func__
, inode
->i_ino
);
1680 if (!test_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
))
1683 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
1684 data
= kzalloc(sizeof(*data
), GFP_NOFS
);
1690 if (!test_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
))
1693 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING
, &nfsi
->flags
)) {
1698 status
= wait_on_bit_lock(&nfsi
->flags
, NFS_INO_LAYOUTCOMMITTING
,
1699 nfs_wait_bit_killable
, TASK_KILLABLE
);
1704 INIT_LIST_HEAD(&data
->lseg_list
);
1705 spin_lock(&inode
->i_lock
);
1706 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
)) {
1707 clear_bit(NFS_INO_LAYOUTCOMMITTING
, &nfsi
->flags
);
1708 spin_unlock(&inode
->i_lock
);
1709 wake_up_bit(&nfsi
->flags
, NFS_INO_LAYOUTCOMMITTING
);
1713 pnfs_list_write_lseg(inode
, &data
->lseg_list
);
1715 end_pos
= nfsi
->layout
->plh_lwb
;
1716 nfsi
->layout
->plh_lwb
= 0;
1718 nfs4_stateid_copy(&data
->args
.stateid
, &nfsi
->layout
->plh_stateid
);
1719 spin_unlock(&inode
->i_lock
);
1721 data
->args
.inode
= inode
;
1722 data
->cred
= get_rpccred(nfsi
->layout
->plh_lc_cred
);
1723 nfs_fattr_init(&data
->fattr
);
1724 data
->args
.bitmask
= NFS_SERVER(inode
)->cache_consistency_bitmask
;
1725 data
->res
.fattr
= &data
->fattr
;
1726 data
->args
.lastbytewritten
= end_pos
- 1;
1727 data
->res
.server
= NFS_SERVER(inode
);
1729 status
= nfs4_proc_layoutcommit(data
, sync
);
1732 mark_inode_dirty_sync(inode
);
1733 dprintk("<-- %s status %d\n", __func__
, status
);
1740 struct nfs4_threshold
*pnfs_mdsthreshold_alloc(void)
1742 struct nfs4_threshold
*thp
;
1744 thp
= kzalloc(sizeof(*thp
), GFP_NOFS
);
1746 dprintk("%s mdsthreshold allocation failed\n", __func__
);