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(ino
, gfp_flags
);
207 pnfs_free_layout_hdr(struct pnfs_layout_hdr
*lo
)
209 struct nfs_server
*server
= NFS_SERVER(lo
->plh_inode
);
210 struct pnfs_layoutdriver_type
*ld
= server
->pnfs_curr_ld
;
212 if (!list_empty(&lo
->plh_layouts
)) {
213 struct nfs_client
*clp
= server
->nfs_client
;
215 spin_lock(&clp
->cl_lock
);
216 list_del_init(&lo
->plh_layouts
);
217 spin_unlock(&clp
->cl_lock
);
219 put_rpccred(lo
->plh_lc_cred
);
220 return ld
->free_layout_hdr(lo
);
224 pnfs_detach_layout_hdr(struct pnfs_layout_hdr
*lo
)
226 struct nfs_inode
*nfsi
= NFS_I(lo
->plh_inode
);
227 dprintk("%s: freeing layout cache %p\n", __func__
, lo
);
229 /* Reset MDS Threshold I/O counters */
235 pnfs_put_layout_hdr(struct pnfs_layout_hdr
*lo
)
237 struct inode
*inode
= lo
->plh_inode
;
239 if (atomic_dec_and_lock(&lo
->plh_refcount
, &inode
->i_lock
)) {
240 pnfs_detach_layout_hdr(lo
);
241 spin_unlock(&inode
->i_lock
);
242 pnfs_free_layout_hdr(lo
);
247 pnfs_iomode_to_fail_bit(u32 iomode
)
249 return iomode
== IOMODE_RW
?
250 NFS_LAYOUT_RW_FAILED
: NFS_LAYOUT_RO_FAILED
;
254 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr
*lo
, int fail_bit
)
256 lo
->plh_retry_timestamp
= jiffies
;
257 if (test_and_set_bit(fail_bit
, &lo
->plh_flags
))
258 atomic_inc(&lo
->plh_refcount
);
262 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr
*lo
, int fail_bit
)
264 if (test_and_clear_bit(fail_bit
, &lo
->plh_flags
))
265 atomic_dec(&lo
->plh_refcount
);
269 pnfs_layout_io_set_failed(struct pnfs_layout_hdr
*lo
, u32 iomode
)
271 struct inode
*inode
= lo
->plh_inode
;
272 struct pnfs_layout_range range
= {
275 .length
= NFS4_MAX_UINT64
,
279 spin_lock(&inode
->i_lock
);
280 pnfs_layout_set_fail_bit(lo
, pnfs_iomode_to_fail_bit(iomode
));
281 pnfs_mark_matching_lsegs_invalid(lo
, &head
, &range
);
282 spin_unlock(&inode
->i_lock
);
283 pnfs_free_lseg_list(&head
);
284 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__
,
285 iomode
== IOMODE_RW
? "RW" : "READ");
289 pnfs_layout_io_test_failed(struct pnfs_layout_hdr
*lo
, u32 iomode
)
291 unsigned long start
, end
;
292 int fail_bit
= pnfs_iomode_to_fail_bit(iomode
);
294 if (test_bit(fail_bit
, &lo
->plh_flags
) == 0)
297 start
= end
- PNFS_LAYOUTGET_RETRY_TIMEOUT
;
298 if (!time_in_range(lo
->plh_retry_timestamp
, start
, end
)) {
299 /* It is time to retry the failed layoutgets */
300 pnfs_layout_clear_fail_bit(lo
, fail_bit
);
307 init_lseg(struct pnfs_layout_hdr
*lo
, struct pnfs_layout_segment
*lseg
)
309 INIT_LIST_HEAD(&lseg
->pls_list
);
310 INIT_LIST_HEAD(&lseg
->pls_lc_list
);
311 atomic_set(&lseg
->pls_refcount
, 1);
313 set_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
);
314 lseg
->pls_layout
= lo
;
317 static void pnfs_free_lseg(struct pnfs_layout_segment
*lseg
)
319 struct inode
*ino
= lseg
->pls_layout
->plh_inode
;
321 NFS_SERVER(ino
)->pnfs_curr_ld
->free_lseg(lseg
);
325 pnfs_layout_remove_lseg(struct pnfs_layout_hdr
*lo
,
326 struct pnfs_layout_segment
*lseg
)
328 struct inode
*inode
= lo
->plh_inode
;
330 WARN_ON(test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
));
331 list_del_init(&lseg
->pls_list
);
332 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
333 atomic_dec(&lo
->plh_refcount
);
334 if (list_empty(&lo
->plh_segs
))
335 clear_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
);
336 rpc_wake_up(&NFS_SERVER(inode
)->roc_rpcwaitq
);
340 pnfs_put_lseg(struct pnfs_layout_segment
*lseg
)
342 struct pnfs_layout_hdr
*lo
;
348 dprintk("%s: lseg %p ref %d valid %d\n", __func__
, lseg
,
349 atomic_read(&lseg
->pls_refcount
),
350 test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
));
351 lo
= lseg
->pls_layout
;
352 inode
= lo
->plh_inode
;
353 if (atomic_dec_and_lock(&lseg
->pls_refcount
, &inode
->i_lock
)) {
354 pnfs_get_layout_hdr(lo
);
355 pnfs_layout_remove_lseg(lo
, lseg
);
356 spin_unlock(&inode
->i_lock
);
357 pnfs_free_lseg(lseg
);
358 pnfs_put_layout_hdr(lo
);
361 EXPORT_SYMBOL_GPL(pnfs_put_lseg
);
364 end_offset(u64 start
, u64 len
)
369 return end
>= start
? end
: NFS4_MAX_UINT64
;
372 /* last octet in a range */
374 last_byte_offset(u64 start
, u64 len
)
380 return end
> start
? end
- 1 : NFS4_MAX_UINT64
;
384 * is l2 fully contained in l1?
386 * [----------------------------------)
391 lo_seg_contained(struct pnfs_layout_range
*l1
,
392 struct pnfs_layout_range
*l2
)
394 u64 start1
= l1
->offset
;
395 u64 end1
= end_offset(start1
, l1
->length
);
396 u64 start2
= l2
->offset
;
397 u64 end2
= end_offset(start2
, l2
->length
);
399 return (start1
<= start2
) && (end1
>= end2
);
403 * is l1 and l2 intersecting?
405 * [----------------------------------)
410 lo_seg_intersecting(struct pnfs_layout_range
*l1
,
411 struct pnfs_layout_range
*l2
)
413 u64 start1
= l1
->offset
;
414 u64 end1
= end_offset(start1
, l1
->length
);
415 u64 start2
= l2
->offset
;
416 u64 end2
= end_offset(start2
, l2
->length
);
418 return (end1
== NFS4_MAX_UINT64
|| end1
> start2
) &&
419 (end2
== NFS4_MAX_UINT64
|| end2
> start1
);
423 should_free_lseg(struct pnfs_layout_range
*lseg_range
,
424 struct pnfs_layout_range
*recall_range
)
426 return (recall_range
->iomode
== IOMODE_ANY
||
427 lseg_range
->iomode
== recall_range
->iomode
) &&
428 lo_seg_intersecting(lseg_range
, recall_range
);
431 /* Returns 1 if lseg is removed from list, 0 otherwise */
432 static int mark_lseg_invalid(struct pnfs_layout_segment
*lseg
,
433 struct list_head
*tmp_list
)
437 if (test_and_clear_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
)) {
438 /* Remove the reference keeping the lseg in the
439 * list. It will now be removed when all
440 * outstanding io is finished.
442 dprintk("%s: lseg %p ref %d\n", __func__
, lseg
,
443 atomic_read(&lseg
->pls_refcount
));
444 if (atomic_dec_and_test(&lseg
->pls_refcount
)) {
445 pnfs_layout_remove_lseg(lseg
->pls_layout
, lseg
);
446 list_add(&lseg
->pls_list
, tmp_list
);
453 /* Returns count of number of matching invalid lsegs remaining in list
457 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr
*lo
,
458 struct list_head
*tmp_list
,
459 struct pnfs_layout_range
*recall_range
)
461 struct pnfs_layout_segment
*lseg
, *next
;
462 int invalid
= 0, removed
= 0;
464 dprintk("%s:Begin lo %p\n", __func__
, lo
);
466 if (list_empty(&lo
->plh_segs
))
468 list_for_each_entry_safe(lseg
, next
, &lo
->plh_segs
, pls_list
)
470 should_free_lseg(&lseg
->pls_range
, recall_range
)) {
471 dprintk("%s: freeing lseg %p iomode %d "
472 "offset %llu length %llu\n", __func__
,
473 lseg
, lseg
->pls_range
.iomode
, lseg
->pls_range
.offset
,
474 lseg
->pls_range
.length
);
476 removed
+= mark_lseg_invalid(lseg
, tmp_list
);
478 dprintk("%s:Return %i\n", __func__
, invalid
- removed
);
479 return invalid
- removed
;
482 /* note free_me must contain lsegs from a single layout_hdr */
484 pnfs_free_lseg_list(struct list_head
*free_me
)
486 struct pnfs_layout_segment
*lseg
, *tmp
;
488 if (list_empty(free_me
))
491 list_for_each_entry_safe(lseg
, tmp
, free_me
, pls_list
) {
492 list_del(&lseg
->pls_list
);
493 pnfs_free_lseg(lseg
);
498 pnfs_destroy_layout(struct nfs_inode
*nfsi
)
500 struct pnfs_layout_hdr
*lo
;
503 spin_lock(&nfsi
->vfs_inode
.i_lock
);
506 lo
->plh_block_lgets
++; /* permanently block new LAYOUTGETs */
507 pnfs_mark_matching_lsegs_invalid(lo
, &tmp_list
, NULL
);
508 pnfs_get_layout_hdr(lo
);
509 pnfs_layout_clear_fail_bit(lo
, NFS_LAYOUT_RO_FAILED
);
510 pnfs_layout_clear_fail_bit(lo
, NFS_LAYOUT_RW_FAILED
);
511 spin_unlock(&nfsi
->vfs_inode
.i_lock
);
512 pnfs_free_lseg_list(&tmp_list
);
513 pnfs_put_layout_hdr(lo
);
515 spin_unlock(&nfsi
->vfs_inode
.i_lock
);
517 EXPORT_SYMBOL_GPL(pnfs_destroy_layout
);
520 * Called by the state manger to remove all layouts established under an
524 pnfs_destroy_all_layouts(struct nfs_client
*clp
)
526 struct nfs_server
*server
;
527 struct pnfs_layout_hdr
*lo
;
530 nfs4_deviceid_mark_client_invalid(clp
);
531 nfs4_deviceid_purge_client(clp
);
533 spin_lock(&clp
->cl_lock
);
535 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
536 if (!list_empty(&server
->layouts
))
537 list_splice_init(&server
->layouts
, &tmp_list
);
540 spin_unlock(&clp
->cl_lock
);
542 while (!list_empty(&tmp_list
)) {
543 lo
= list_entry(tmp_list
.next
, struct pnfs_layout_hdr
,
545 dprintk("%s freeing layout for inode %lu\n", __func__
,
546 lo
->plh_inode
->i_ino
);
547 list_del_init(&lo
->plh_layouts
);
548 pnfs_destroy_layout(NFS_I(lo
->plh_inode
));
552 /* update lo->plh_stateid with new if is more recent */
554 pnfs_set_layout_stateid(struct pnfs_layout_hdr
*lo
, const nfs4_stateid
*new,
559 oldseq
= be32_to_cpu(lo
->plh_stateid
.seqid
);
560 newseq
= be32_to_cpu(new->seqid
);
561 if ((int)(newseq
- oldseq
) > 0) {
562 nfs4_stateid_copy(&lo
->plh_stateid
, new);
563 if (update_barrier
) {
564 u32 new_barrier
= be32_to_cpu(new->seqid
);
566 if ((int)(new_barrier
- lo
->plh_barrier
))
567 lo
->plh_barrier
= new_barrier
;
569 /* Because of wraparound, we want to keep the barrier
570 * "close" to the current seqids. It needs to be
571 * within 2**31 to count as "behind", so if it
572 * gets too near that limit, give us a litle leeway
573 * and bring it to within 2**30.
574 * NOTE - and yes, this is all unsigned arithmetic.
576 if (unlikely((newseq
- lo
->plh_barrier
) > (3 << 29)))
577 lo
->plh_barrier
= newseq
- (1 << 30);
582 /* lget is set to 1 if called from inside send_layoutget call chain */
584 pnfs_layoutgets_blocked(struct pnfs_layout_hdr
*lo
, nfs4_stateid
*stateid
,
588 (int)(lo
->plh_barrier
- be32_to_cpu(stateid
->seqid
)) >= 0)
590 return lo
->plh_block_lgets
||
591 test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
) ||
592 (list_empty(&lo
->plh_segs
) &&
593 (atomic_read(&lo
->plh_outstanding
) > lget
));
597 pnfs_choose_layoutget_stateid(nfs4_stateid
*dst
, struct pnfs_layout_hdr
*lo
,
598 struct nfs4_state
*open_state
)
602 dprintk("--> %s\n", __func__
);
603 spin_lock(&lo
->plh_inode
->i_lock
);
604 if (pnfs_layoutgets_blocked(lo
, NULL
, 1)) {
606 } else if (list_empty(&lo
->plh_segs
)) {
610 seq
= read_seqbegin(&open_state
->seqlock
);
611 nfs4_stateid_copy(dst
, &open_state
->stateid
);
612 } while (read_seqretry(&open_state
->seqlock
, seq
));
614 nfs4_stateid_copy(dst
, &lo
->plh_stateid
);
615 spin_unlock(&lo
->plh_inode
->i_lock
);
616 dprintk("<-- %s\n", __func__
);
621 * Get layout from server.
622 * for now, assume that whole file layouts are requested.
624 * arg->length: all ones
626 static struct pnfs_layout_segment
*
627 send_layoutget(struct pnfs_layout_hdr
*lo
,
628 struct nfs_open_context
*ctx
,
629 struct pnfs_layout_range
*range
,
632 struct inode
*ino
= lo
->plh_inode
;
633 struct nfs_server
*server
= NFS_SERVER(ino
);
634 struct nfs4_layoutget
*lgp
;
635 struct pnfs_layout_segment
*lseg
;
637 dprintk("--> %s\n", __func__
);
640 lgp
= kzalloc(sizeof(*lgp
), gfp_flags
);
644 lgp
->args
.minlength
= PAGE_CACHE_SIZE
;
645 if (lgp
->args
.minlength
> range
->length
)
646 lgp
->args
.minlength
= range
->length
;
647 lgp
->args
.maxcount
= PNFS_LAYOUT_MAXSIZE
;
648 lgp
->args
.range
= *range
;
649 lgp
->args
.type
= server
->pnfs_curr_ld
->id
;
650 lgp
->args
.inode
= ino
;
651 lgp
->args
.ctx
= get_nfs_open_context(ctx
);
652 lgp
->gfp_flags
= gfp_flags
;
654 /* Synchronously retrieve layout information from server and
657 lseg
= nfs4_proc_layoutget(lgp
, gfp_flags
);
659 switch (PTR_ERR(lseg
)) {
664 /* remember that LAYOUTGET failed and suspend trying */
665 pnfs_layout_io_set_failed(lo
, range
->iomode
);
674 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
675 * when the layout segment list is empty.
677 * Note that a pnfs_layout_hdr can exist with an empty layout segment
678 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
679 * deviceid is marked invalid.
682 _pnfs_return_layout(struct inode
*ino
)
684 struct pnfs_layout_hdr
*lo
= NULL
;
685 struct nfs_inode
*nfsi
= NFS_I(ino
);
687 struct nfs4_layoutreturn
*lrp
;
688 nfs4_stateid stateid
;
689 int status
= 0, empty
;
691 dprintk("NFS: %s for inode %lu\n", __func__
, ino
->i_ino
);
693 spin_lock(&ino
->i_lock
);
696 spin_unlock(&ino
->i_lock
);
697 dprintk("NFS: %s no layout to return\n", __func__
);
700 stateid
= nfsi
->layout
->plh_stateid
;
701 /* Reference matched in nfs4_layoutreturn_release */
702 pnfs_get_layout_hdr(lo
);
703 empty
= list_empty(&lo
->plh_segs
);
704 pnfs_mark_matching_lsegs_invalid(lo
, &tmp_list
, NULL
);
705 /* Don't send a LAYOUTRETURN if list was initially empty */
707 spin_unlock(&ino
->i_lock
);
708 pnfs_put_layout_hdr(lo
);
709 dprintk("NFS: %s no layout segments to return\n", __func__
);
712 lo
->plh_block_lgets
++;
713 spin_unlock(&ino
->i_lock
);
714 pnfs_free_lseg_list(&tmp_list
);
716 WARN_ON(test_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
));
718 lrp
= kzalloc(sizeof(*lrp
), GFP_KERNEL
);
719 if (unlikely(lrp
== NULL
)) {
721 spin_lock(&ino
->i_lock
);
722 lo
->plh_block_lgets
--;
723 spin_unlock(&ino
->i_lock
);
724 pnfs_put_layout_hdr(lo
);
728 lrp
->args
.stateid
= stateid
;
729 lrp
->args
.layout_type
= NFS_SERVER(ino
)->pnfs_curr_ld
->id
;
730 lrp
->args
.inode
= ino
;
731 lrp
->args
.layout
= lo
;
732 lrp
->clp
= NFS_SERVER(ino
)->nfs_client
;
734 status
= nfs4_proc_layoutreturn(lrp
);
736 dprintk("<-- %s status: %d\n", __func__
, status
);
739 EXPORT_SYMBOL_GPL(_pnfs_return_layout
);
741 bool pnfs_roc(struct inode
*ino
)
743 struct pnfs_layout_hdr
*lo
;
744 struct pnfs_layout_segment
*lseg
, *tmp
;
748 spin_lock(&ino
->i_lock
);
749 lo
= NFS_I(ino
)->layout
;
750 if (!lo
|| !test_and_clear_bit(NFS_LAYOUT_ROC
, &lo
->plh_flags
) ||
751 test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
))
753 list_for_each_entry_safe(lseg
, tmp
, &lo
->plh_segs
, pls_list
)
754 if (test_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
)) {
755 mark_lseg_invalid(lseg
, &tmp_list
);
760 lo
->plh_block_lgets
++;
761 pnfs_get_layout_hdr(lo
); /* matched in pnfs_roc_release */
762 spin_unlock(&ino
->i_lock
);
763 pnfs_free_lseg_list(&tmp_list
);
767 spin_unlock(&ino
->i_lock
);
771 void pnfs_roc_release(struct inode
*ino
)
773 struct pnfs_layout_hdr
*lo
;
775 spin_lock(&ino
->i_lock
);
776 lo
= NFS_I(ino
)->layout
;
777 lo
->plh_block_lgets
--;
778 if (atomic_dec_and_test(&lo
->plh_refcount
)) {
779 pnfs_detach_layout_hdr(lo
);
780 spin_unlock(&ino
->i_lock
);
781 pnfs_free_layout_hdr(lo
);
783 spin_unlock(&ino
->i_lock
);
786 void pnfs_roc_set_barrier(struct inode
*ino
, u32 barrier
)
788 struct pnfs_layout_hdr
*lo
;
790 spin_lock(&ino
->i_lock
);
791 lo
= NFS_I(ino
)->layout
;
792 if ((int)(barrier
- lo
->plh_barrier
) > 0)
793 lo
->plh_barrier
= barrier
;
794 spin_unlock(&ino
->i_lock
);
797 bool pnfs_roc_drain(struct inode
*ino
, u32
*barrier
, struct rpc_task
*task
)
799 struct nfs_inode
*nfsi
= NFS_I(ino
);
800 struct pnfs_layout_hdr
*lo
;
801 struct pnfs_layout_segment
*lseg
;
805 spin_lock(&ino
->i_lock
);
806 list_for_each_entry(lseg
, &nfsi
->layout
->plh_segs
, pls_list
)
807 if (test_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
)) {
808 rpc_sleep_on(&NFS_SERVER(ino
)->roc_rpcwaitq
, task
, NULL
);
813 current_seqid
= be32_to_cpu(lo
->plh_stateid
.seqid
);
815 /* Since close does not return a layout stateid for use as
816 * a barrier, we choose the worst-case barrier.
818 *barrier
= current_seqid
+ atomic_read(&lo
->plh_outstanding
);
820 spin_unlock(&ino
->i_lock
);
825 * Compare two layout segments for sorting into layout cache.
826 * We want to preferentially return RW over RO layouts, so ensure those
830 cmp_layout(struct pnfs_layout_range
*l1
,
831 struct pnfs_layout_range
*l2
)
835 /* high offset > low offset */
836 d
= l1
->offset
- l2
->offset
;
840 /* short length > long length */
841 d
= l2
->length
- l1
->length
;
845 /* read > read/write */
846 return (int)(l1
->iomode
== IOMODE_READ
) - (int)(l2
->iomode
== IOMODE_READ
);
850 pnfs_layout_insert_lseg(struct pnfs_layout_hdr
*lo
,
851 struct pnfs_layout_segment
*lseg
)
853 struct pnfs_layout_segment
*lp
;
855 dprintk("%s:Begin\n", __func__
);
857 list_for_each_entry(lp
, &lo
->plh_segs
, pls_list
) {
858 if (cmp_layout(&lseg
->pls_range
, &lp
->pls_range
) > 0)
860 list_add_tail(&lseg
->pls_list
, &lp
->pls_list
);
861 dprintk("%s: inserted lseg %p "
862 "iomode %d offset %llu length %llu before "
863 "lp %p iomode %d offset %llu length %llu\n",
864 __func__
, lseg
, lseg
->pls_range
.iomode
,
865 lseg
->pls_range
.offset
, lseg
->pls_range
.length
,
866 lp
, lp
->pls_range
.iomode
, lp
->pls_range
.offset
,
867 lp
->pls_range
.length
);
870 list_add_tail(&lseg
->pls_list
, &lo
->plh_segs
);
871 dprintk("%s: inserted lseg %p "
872 "iomode %d offset %llu length %llu at tail\n",
873 __func__
, lseg
, lseg
->pls_range
.iomode
,
874 lseg
->pls_range
.offset
, lseg
->pls_range
.length
);
876 pnfs_get_layout_hdr(lo
);
878 dprintk("%s:Return\n", __func__
);
881 static struct pnfs_layout_hdr
*
882 alloc_init_layout_hdr(struct inode
*ino
,
883 struct nfs_open_context
*ctx
,
886 struct pnfs_layout_hdr
*lo
;
888 lo
= pnfs_alloc_layout_hdr(ino
, gfp_flags
);
891 atomic_set(&lo
->plh_refcount
, 1);
892 INIT_LIST_HEAD(&lo
->plh_layouts
);
893 INIT_LIST_HEAD(&lo
->plh_segs
);
894 INIT_LIST_HEAD(&lo
->plh_bulk_recall
);
896 lo
->plh_lc_cred
= get_rpccred(ctx
->state
->owner
->so_cred
);
900 static struct pnfs_layout_hdr
*
901 pnfs_find_alloc_layout(struct inode
*ino
,
902 struct nfs_open_context
*ctx
,
905 struct nfs_inode
*nfsi
= NFS_I(ino
);
906 struct pnfs_layout_hdr
*new = NULL
;
908 dprintk("%s Begin ino=%p layout=%p\n", __func__
, ino
, nfsi
->layout
);
910 if (nfsi
->layout
!= NULL
)
912 spin_unlock(&ino
->i_lock
);
913 new = alloc_init_layout_hdr(ino
, ctx
, gfp_flags
);
914 spin_lock(&ino
->i_lock
);
916 if (likely(nfsi
->layout
== NULL
)) { /* Won the race? */
920 pnfs_free_layout_hdr(new);
922 pnfs_get_layout_hdr(nfsi
->layout
);
927 * iomode matching rules:
938 is_matching_lseg(struct pnfs_layout_range
*ls_range
,
939 struct pnfs_layout_range
*range
)
941 struct pnfs_layout_range range1
;
943 if ((range
->iomode
== IOMODE_RW
&&
944 ls_range
->iomode
!= IOMODE_RW
) ||
945 !lo_seg_intersecting(ls_range
, range
))
948 /* range1 covers only the first byte in the range */
951 return lo_seg_contained(ls_range
, &range1
);
955 * lookup range in layout
957 static struct pnfs_layout_segment
*
958 pnfs_find_lseg(struct pnfs_layout_hdr
*lo
,
959 struct pnfs_layout_range
*range
)
961 struct pnfs_layout_segment
*lseg
, *ret
= NULL
;
963 dprintk("%s:Begin\n", __func__
);
965 list_for_each_entry(lseg
, &lo
->plh_segs
, pls_list
) {
966 if (test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
) &&
967 is_matching_lseg(&lseg
->pls_range
, range
)) {
968 ret
= pnfs_get_lseg(lseg
);
971 if (lseg
->pls_range
.offset
> range
->offset
)
975 dprintk("%s:Return lseg %p ref %d\n",
976 __func__
, ret
, ret
? atomic_read(&ret
->pls_refcount
) : 0);
981 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
982 * to the MDS or over pNFS
984 * The nfs_inode read_io and write_io fields are cumulative counters reset
985 * when there are no layout segments. Note that in pnfs_update_layout iomode
986 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
989 * A return of true means use MDS I/O.
992 * If a file's size is smaller than the file size threshold, data accesses
993 * SHOULD be sent to the metadata server. If an I/O request has a length that
994 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
995 * server. If both file size and I/O size are provided, the client SHOULD
996 * reach or exceed both thresholds before sending its read or write
997 * requests to the data server.
999 static bool pnfs_within_mdsthreshold(struct nfs_open_context
*ctx
,
1000 struct inode
*ino
, int iomode
)
1002 struct nfs4_threshold
*t
= ctx
->mdsthreshold
;
1003 struct nfs_inode
*nfsi
= NFS_I(ino
);
1004 loff_t fsize
= i_size_read(ino
);
1005 bool size
= false, size_set
= false, io
= false, io_set
= false, ret
= false;
1010 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1011 __func__
, t
->bm
, t
->rd_sz
, t
->wr_sz
, t
->rd_io_sz
, t
->wr_io_sz
);
1015 if (t
->bm
& THRESHOLD_RD
) {
1016 dprintk("%s fsize %llu\n", __func__
, fsize
);
1018 if (fsize
< t
->rd_sz
)
1021 if (t
->bm
& THRESHOLD_RD_IO
) {
1022 dprintk("%s nfsi->read_io %llu\n", __func__
,
1025 if (nfsi
->read_io
< t
->rd_io_sz
)
1030 if (t
->bm
& THRESHOLD_WR
) {
1031 dprintk("%s fsize %llu\n", __func__
, fsize
);
1033 if (fsize
< t
->wr_sz
)
1036 if (t
->bm
& THRESHOLD_WR_IO
) {
1037 dprintk("%s nfsi->write_io %llu\n", __func__
,
1040 if (nfsi
->write_io
< t
->wr_io_sz
)
1045 if (size_set
&& io_set
) {
1048 } else if (size
|| io
)
1051 dprintk("<-- %s size %d io %d ret %d\n", __func__
, size
, io
, ret
);
1056 * Layout segment is retreived from the server if not cached.
1057 * The appropriate layout segment is referenced and returned to the caller.
1059 struct pnfs_layout_segment
*
1060 pnfs_update_layout(struct inode
*ino
,
1061 struct nfs_open_context
*ctx
,
1064 enum pnfs_iomode iomode
,
1067 struct pnfs_layout_range arg
= {
1073 struct nfs_server
*server
= NFS_SERVER(ino
);
1074 struct nfs_client
*clp
= server
->nfs_client
;
1075 struct pnfs_layout_hdr
*lo
;
1076 struct pnfs_layout_segment
*lseg
= NULL
;
1079 if (!pnfs_enabled_sb(NFS_SERVER(ino
)))
1082 if (pnfs_within_mdsthreshold(ctx
, ino
, iomode
))
1085 spin_lock(&ino
->i_lock
);
1086 lo
= pnfs_find_alloc_layout(ino
, ctx
, gfp_flags
);
1088 spin_unlock(&ino
->i_lock
);
1092 /* Do we even need to bother with this? */
1093 if (test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
)) {
1094 dprintk("%s matches recall, use MDS\n", __func__
);
1098 /* if LAYOUTGET already failed once we don't try again */
1099 if (pnfs_layout_io_test_failed(lo
, iomode
))
1102 /* Check to see if the layout for the given range already exists */
1103 lseg
= pnfs_find_lseg(lo
, &arg
);
1107 if (pnfs_layoutgets_blocked(lo
, NULL
, 0))
1109 atomic_inc(&lo
->plh_outstanding
);
1111 if (list_empty(&lo
->plh_segs
))
1114 spin_unlock(&ino
->i_lock
);
1116 /* The lo must be on the clp list if there is any
1117 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1119 spin_lock(&clp
->cl_lock
);
1120 BUG_ON(!list_empty(&lo
->plh_layouts
));
1121 list_add_tail(&lo
->plh_layouts
, &server
->layouts
);
1122 spin_unlock(&clp
->cl_lock
);
1125 pg_offset
= arg
.offset
& ~PAGE_CACHE_MASK
;
1127 arg
.offset
-= pg_offset
;
1128 arg
.length
+= pg_offset
;
1130 if (arg
.length
!= NFS4_MAX_UINT64
)
1131 arg
.length
= PAGE_CACHE_ALIGN(arg
.length
);
1133 lseg
= send_layoutget(lo
, ctx
, &arg
, gfp_flags
);
1134 atomic_dec(&lo
->plh_outstanding
);
1136 pnfs_put_layout_hdr(lo
);
1138 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1139 "(%s, offset: %llu, length: %llu)\n",
1140 __func__
, ino
->i_sb
->s_id
,
1141 (unsigned long long)NFS_FILEID(ino
),
1142 lseg
== NULL
? "not found" : "found",
1143 iomode
==IOMODE_RW
? "read/write" : "read-only",
1144 (unsigned long long)pos
,
1145 (unsigned long long)count
);
1148 spin_unlock(&ino
->i_lock
);
1149 goto out_put_layout_hdr
;
1151 EXPORT_SYMBOL_GPL(pnfs_update_layout
);
1153 struct pnfs_layout_segment
*
1154 pnfs_layout_process(struct nfs4_layoutget
*lgp
)
1156 struct pnfs_layout_hdr
*lo
= NFS_I(lgp
->args
.inode
)->layout
;
1157 struct nfs4_layoutget_res
*res
= &lgp
->res
;
1158 struct pnfs_layout_segment
*lseg
;
1159 struct inode
*ino
= lo
->plh_inode
;
1162 /* Inject layout blob into I/O device driver */
1163 lseg
= NFS_SERVER(ino
)->pnfs_curr_ld
->alloc_lseg(lo
, res
, lgp
->gfp_flags
);
1164 if (!lseg
|| IS_ERR(lseg
)) {
1168 status
= PTR_ERR(lseg
);
1169 dprintk("%s: Could not allocate layout: error %d\n",
1174 spin_lock(&ino
->i_lock
);
1175 if (test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
)) {
1176 dprintk("%s forget reply due to recall\n", __func__
);
1177 goto out_forget_reply
;
1180 if (pnfs_layoutgets_blocked(lo
, &res
->stateid
, 1)) {
1181 dprintk("%s forget reply due to state\n", __func__
);
1182 goto out_forget_reply
;
1184 init_lseg(lo
, lseg
);
1185 lseg
->pls_range
= res
->range
;
1186 pnfs_get_lseg(lseg
);
1187 pnfs_layout_insert_lseg(lo
, lseg
);
1189 if (res
->return_on_close
) {
1190 set_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
);
1191 set_bit(NFS_LAYOUT_ROC
, &lo
->plh_flags
);
1194 /* Done processing layoutget. Set the layout stateid */
1195 pnfs_set_layout_stateid(lo
, &res
->stateid
, false);
1196 spin_unlock(&ino
->i_lock
);
1199 return ERR_PTR(status
);
1202 spin_unlock(&ino
->i_lock
);
1203 lseg
->pls_layout
= lo
;
1204 NFS_SERVER(ino
)->pnfs_curr_ld
->free_lseg(lseg
);
1209 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*req
)
1211 BUG_ON(pgio
->pg_lseg
!= NULL
);
1213 if (req
->wb_offset
!= req
->wb_pgbase
) {
1214 nfs_pageio_reset_read_mds(pgio
);
1217 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
1223 /* If no lseg, fall back to read through mds */
1224 if (pgio
->pg_lseg
== NULL
)
1225 nfs_pageio_reset_read_mds(pgio
);
1228 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read
);
1231 pnfs_generic_pg_init_write(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_write_mds(pgio
);
1239 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
1245 /* If no lseg, fall back to write through mds */
1246 if (pgio
->pg_lseg
== NULL
)
1247 nfs_pageio_reset_write_mds(pgio
);
1249 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write
);
1252 pnfs_pageio_init_read(struct nfs_pageio_descriptor
*pgio
, struct inode
*inode
,
1253 const struct nfs_pgio_completion_ops
*compl_ops
)
1255 struct nfs_server
*server
= NFS_SERVER(inode
);
1256 struct pnfs_layoutdriver_type
*ld
= server
->pnfs_curr_ld
;
1259 nfs_pageio_init_read(pgio
, inode
, compl_ops
);
1261 nfs_pageio_init(pgio
, inode
, ld
->pg_read_ops
, compl_ops
, server
->rsize
, 0);
1265 pnfs_pageio_init_write(struct nfs_pageio_descriptor
*pgio
, struct inode
*inode
,
1267 const struct nfs_pgio_completion_ops
*compl_ops
)
1269 struct nfs_server
*server
= NFS_SERVER(inode
);
1270 struct pnfs_layoutdriver_type
*ld
= server
->pnfs_curr_ld
;
1273 nfs_pageio_init_write(pgio
, inode
, ioflags
, compl_ops
);
1275 nfs_pageio_init(pgio
, inode
, ld
->pg_write_ops
, compl_ops
, server
->wsize
, ioflags
);
1279 pnfs_generic_pg_test(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*prev
,
1280 struct nfs_page
*req
)
1282 if (pgio
->pg_lseg
== NULL
)
1283 return nfs_generic_pg_test(pgio
, prev
, req
);
1286 * Test if a nfs_page is fully contained in the pnfs_layout_range.
1287 * Note that this test makes several assumptions:
1288 * - that the previous nfs_page in the struct nfs_pageio_descriptor
1289 * is known to lie within the range.
1290 * - that the nfs_page being tested is known to be contiguous with the
1291 * previous nfs_page.
1292 * - Layout ranges are page aligned, so we only have to test the
1293 * start offset of the request.
1295 * Please also note that 'end_offset' is actually the offset of the
1296 * first byte that lies outside the pnfs_layout_range. FIXME?
1299 return req_offset(req
) < end_offset(pgio
->pg_lseg
->pls_range
.offset
,
1300 pgio
->pg_lseg
->pls_range
.length
);
1302 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test
);
1304 int pnfs_write_done_resend_to_mds(struct inode
*inode
,
1305 struct list_head
*head
,
1306 const struct nfs_pgio_completion_ops
*compl_ops
)
1308 struct nfs_pageio_descriptor pgio
;
1311 /* Resend all requests through the MDS */
1312 nfs_pageio_init_write(&pgio
, inode
, FLUSH_STABLE
, compl_ops
);
1313 while (!list_empty(head
)) {
1314 struct nfs_page
*req
= nfs_list_entry(head
->next
);
1316 nfs_list_remove_request(req
);
1317 if (!nfs_pageio_add_request(&pgio
, req
))
1318 nfs_list_add_request(req
, &failed
);
1320 nfs_pageio_complete(&pgio
);
1322 if (!list_empty(&failed
)) {
1323 /* For some reason our attempt to resend pages. Mark the
1324 * overall send request as having failed, and let
1325 * nfs_writeback_release_full deal with the error.
1327 list_move(&failed
, head
);
1332 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds
);
1334 static void pnfs_ld_handle_write_error(struct nfs_write_data
*data
)
1336 struct nfs_pgio_header
*hdr
= data
->header
;
1338 dprintk("pnfs write error = %d\n", hdr
->pnfs_error
);
1339 if (NFS_SERVER(hdr
->inode
)->pnfs_curr_ld
->flags
&
1340 PNFS_LAYOUTRET_ON_ERROR
) {
1341 clear_bit(NFS_INO_LAYOUTCOMMIT
, &NFS_I(hdr
->inode
)->flags
);
1342 pnfs_return_layout(hdr
->inode
);
1344 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
))
1345 data
->task
.tk_status
= pnfs_write_done_resend_to_mds(hdr
->inode
,
1347 hdr
->completion_ops
);
1351 * Called by non rpc-based layout drivers
1353 void pnfs_ld_write_done(struct nfs_write_data
*data
)
1355 struct nfs_pgio_header
*hdr
= data
->header
;
1357 if (!hdr
->pnfs_error
) {
1358 pnfs_set_layoutcommit(data
);
1359 hdr
->mds_ops
->rpc_call_done(&data
->task
, data
);
1361 pnfs_ld_handle_write_error(data
);
1362 hdr
->mds_ops
->rpc_release(data
);
1364 EXPORT_SYMBOL_GPL(pnfs_ld_write_done
);
1367 pnfs_write_through_mds(struct nfs_pageio_descriptor
*desc
,
1368 struct nfs_write_data
*data
)
1370 struct nfs_pgio_header
*hdr
= data
->header
;
1372 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
1373 list_splice_tail_init(&hdr
->pages
, &desc
->pg_list
);
1374 nfs_pageio_reset_write_mds(desc
);
1375 desc
->pg_recoalesce
= 1;
1377 nfs_writedata_release(data
);
1380 static enum pnfs_try_status
1381 pnfs_try_to_write_data(struct nfs_write_data
*wdata
,
1382 const struct rpc_call_ops
*call_ops
,
1383 struct pnfs_layout_segment
*lseg
,
1386 struct nfs_pgio_header
*hdr
= wdata
->header
;
1387 struct inode
*inode
= hdr
->inode
;
1388 enum pnfs_try_status trypnfs
;
1389 struct nfs_server
*nfss
= NFS_SERVER(inode
);
1391 hdr
->mds_ops
= call_ops
;
1393 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__
,
1394 inode
->i_ino
, wdata
->args
.count
, wdata
->args
.offset
, how
);
1395 trypnfs
= nfss
->pnfs_curr_ld
->write_pagelist(wdata
, how
);
1396 if (trypnfs
!= PNFS_NOT_ATTEMPTED
)
1397 nfs_inc_stats(inode
, NFSIOS_PNFS_WRITE
);
1398 dprintk("%s End (trypnfs:%d)\n", __func__
, trypnfs
);
1403 pnfs_do_multiple_writes(struct nfs_pageio_descriptor
*desc
, struct list_head
*head
, int how
)
1405 struct nfs_write_data
*data
;
1406 const struct rpc_call_ops
*call_ops
= desc
->pg_rpc_callops
;
1407 struct pnfs_layout_segment
*lseg
= desc
->pg_lseg
;
1409 desc
->pg_lseg
= NULL
;
1410 while (!list_empty(head
)) {
1411 enum pnfs_try_status trypnfs
;
1413 data
= list_first_entry(head
, struct nfs_write_data
, list
);
1414 list_del_init(&data
->list
);
1416 trypnfs
= pnfs_try_to_write_data(data
, call_ops
, lseg
, how
);
1417 if (trypnfs
== PNFS_NOT_ATTEMPTED
)
1418 pnfs_write_through_mds(desc
, data
);
1420 pnfs_put_lseg(lseg
);
1423 static void pnfs_writehdr_free(struct nfs_pgio_header
*hdr
)
1425 pnfs_put_lseg(hdr
->lseg
);
1426 nfs_writehdr_free(hdr
);
1428 EXPORT_SYMBOL_GPL(pnfs_writehdr_free
);
1431 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor
*desc
)
1433 struct nfs_write_header
*whdr
;
1434 struct nfs_pgio_header
*hdr
;
1437 whdr
= nfs_writehdr_alloc();
1439 desc
->pg_completion_ops
->error_cleanup(&desc
->pg_list
);
1440 pnfs_put_lseg(desc
->pg_lseg
);
1441 desc
->pg_lseg
= NULL
;
1444 hdr
= &whdr
->header
;
1445 nfs_pgheader_init(desc
, hdr
, pnfs_writehdr_free
);
1446 hdr
->lseg
= pnfs_get_lseg(desc
->pg_lseg
);
1447 atomic_inc(&hdr
->refcnt
);
1448 ret
= nfs_generic_flush(desc
, hdr
);
1450 pnfs_put_lseg(desc
->pg_lseg
);
1451 desc
->pg_lseg
= NULL
;
1453 pnfs_do_multiple_writes(desc
, &hdr
->rpc_list
, desc
->pg_ioflags
);
1454 if (atomic_dec_and_test(&hdr
->refcnt
))
1455 hdr
->completion_ops
->completion(hdr
);
1458 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages
);
1460 int pnfs_read_done_resend_to_mds(struct inode
*inode
,
1461 struct list_head
*head
,
1462 const struct nfs_pgio_completion_ops
*compl_ops
)
1464 struct nfs_pageio_descriptor pgio
;
1467 /* Resend all requests through the MDS */
1468 nfs_pageio_init_read(&pgio
, inode
, compl_ops
);
1469 while (!list_empty(head
)) {
1470 struct nfs_page
*req
= nfs_list_entry(head
->next
);
1472 nfs_list_remove_request(req
);
1473 if (!nfs_pageio_add_request(&pgio
, req
))
1474 nfs_list_add_request(req
, &failed
);
1476 nfs_pageio_complete(&pgio
);
1478 if (!list_empty(&failed
)) {
1479 list_move(&failed
, head
);
1484 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds
);
1486 static void pnfs_ld_handle_read_error(struct nfs_read_data
*data
)
1488 struct nfs_pgio_header
*hdr
= data
->header
;
1490 dprintk("pnfs read error = %d\n", hdr
->pnfs_error
);
1491 if (NFS_SERVER(hdr
->inode
)->pnfs_curr_ld
->flags
&
1492 PNFS_LAYOUTRET_ON_ERROR
) {
1493 clear_bit(NFS_INO_LAYOUTCOMMIT
, &NFS_I(hdr
->inode
)->flags
);
1494 pnfs_return_layout(hdr
->inode
);
1496 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
))
1497 data
->task
.tk_status
= pnfs_read_done_resend_to_mds(hdr
->inode
,
1499 hdr
->completion_ops
);
1503 * Called by non rpc-based layout drivers
1505 void pnfs_ld_read_done(struct nfs_read_data
*data
)
1507 struct nfs_pgio_header
*hdr
= data
->header
;
1509 if (likely(!hdr
->pnfs_error
)) {
1510 __nfs4_read_done_cb(data
);
1511 hdr
->mds_ops
->rpc_call_done(&data
->task
, data
);
1513 pnfs_ld_handle_read_error(data
);
1514 hdr
->mds_ops
->rpc_release(data
);
1516 EXPORT_SYMBOL_GPL(pnfs_ld_read_done
);
1519 pnfs_read_through_mds(struct nfs_pageio_descriptor
*desc
,
1520 struct nfs_read_data
*data
)
1522 struct nfs_pgio_header
*hdr
= data
->header
;
1524 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
1525 list_splice_tail_init(&hdr
->pages
, &desc
->pg_list
);
1526 nfs_pageio_reset_read_mds(desc
);
1527 desc
->pg_recoalesce
= 1;
1529 nfs_readdata_release(data
);
1533 * Call the appropriate parallel I/O subsystem read function.
1535 static enum pnfs_try_status
1536 pnfs_try_to_read_data(struct nfs_read_data
*rdata
,
1537 const struct rpc_call_ops
*call_ops
,
1538 struct pnfs_layout_segment
*lseg
)
1540 struct nfs_pgio_header
*hdr
= rdata
->header
;
1541 struct inode
*inode
= hdr
->inode
;
1542 struct nfs_server
*nfss
= NFS_SERVER(inode
);
1543 enum pnfs_try_status trypnfs
;
1545 hdr
->mds_ops
= call_ops
;
1547 dprintk("%s: Reading ino:%lu %u@%llu\n",
1548 __func__
, inode
->i_ino
, rdata
->args
.count
, rdata
->args
.offset
);
1550 trypnfs
= nfss
->pnfs_curr_ld
->read_pagelist(rdata
);
1551 if (trypnfs
!= PNFS_NOT_ATTEMPTED
)
1552 nfs_inc_stats(inode
, NFSIOS_PNFS_READ
);
1553 dprintk("%s End (trypnfs:%d)\n", __func__
, trypnfs
);
1558 pnfs_do_multiple_reads(struct nfs_pageio_descriptor
*desc
, struct list_head
*head
)
1560 struct nfs_read_data
*data
;
1561 const struct rpc_call_ops
*call_ops
= desc
->pg_rpc_callops
;
1562 struct pnfs_layout_segment
*lseg
= desc
->pg_lseg
;
1564 desc
->pg_lseg
= NULL
;
1565 while (!list_empty(head
)) {
1566 enum pnfs_try_status trypnfs
;
1568 data
= list_first_entry(head
, struct nfs_read_data
, list
);
1569 list_del_init(&data
->list
);
1571 trypnfs
= pnfs_try_to_read_data(data
, call_ops
, lseg
);
1572 if (trypnfs
== PNFS_NOT_ATTEMPTED
)
1573 pnfs_read_through_mds(desc
, data
);
1575 pnfs_put_lseg(lseg
);
1578 static void pnfs_readhdr_free(struct nfs_pgio_header
*hdr
)
1580 pnfs_put_lseg(hdr
->lseg
);
1581 nfs_readhdr_free(hdr
);
1583 EXPORT_SYMBOL_GPL(pnfs_readhdr_free
);
1586 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor
*desc
)
1588 struct nfs_read_header
*rhdr
;
1589 struct nfs_pgio_header
*hdr
;
1592 rhdr
= nfs_readhdr_alloc();
1594 desc
->pg_completion_ops
->error_cleanup(&desc
->pg_list
);
1596 pnfs_put_lseg(desc
->pg_lseg
);
1597 desc
->pg_lseg
= NULL
;
1600 hdr
= &rhdr
->header
;
1601 nfs_pgheader_init(desc
, hdr
, pnfs_readhdr_free
);
1602 hdr
->lseg
= pnfs_get_lseg(desc
->pg_lseg
);
1603 atomic_inc(&hdr
->refcnt
);
1604 ret
= nfs_generic_pagein(desc
, hdr
);
1606 pnfs_put_lseg(desc
->pg_lseg
);
1607 desc
->pg_lseg
= NULL
;
1609 pnfs_do_multiple_reads(desc
, &hdr
->rpc_list
);
1610 if (atomic_dec_and_test(&hdr
->refcnt
))
1611 hdr
->completion_ops
->completion(hdr
);
1614 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages
);
1617 * There can be multiple RW segments.
1619 static void pnfs_list_write_lseg(struct inode
*inode
, struct list_head
*listp
)
1621 struct pnfs_layout_segment
*lseg
;
1623 list_for_each_entry(lseg
, &NFS_I(inode
)->layout
->plh_segs
, pls_list
) {
1624 if (lseg
->pls_range
.iomode
== IOMODE_RW
&&
1625 test_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
))
1626 list_add(&lseg
->pls_lc_list
, listp
);
1630 void pnfs_set_lo_fail(struct pnfs_layout_segment
*lseg
)
1632 pnfs_layout_io_set_failed(lseg
->pls_layout
, lseg
->pls_range
.iomode
);
1634 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail
);
1637 pnfs_set_layoutcommit(struct nfs_write_data
*wdata
)
1639 struct nfs_pgio_header
*hdr
= wdata
->header
;
1640 struct inode
*inode
= hdr
->inode
;
1641 struct nfs_inode
*nfsi
= NFS_I(inode
);
1642 loff_t end_pos
= wdata
->mds_offset
+ wdata
->res
.count
;
1643 bool mark_as_dirty
= false;
1645 spin_lock(&inode
->i_lock
);
1646 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
)) {
1647 mark_as_dirty
= true;
1648 dprintk("%s: Set layoutcommit for inode %lu ",
1649 __func__
, inode
->i_ino
);
1651 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT
, &hdr
->lseg
->pls_flags
)) {
1652 /* references matched in nfs4_layoutcommit_release */
1653 pnfs_get_lseg(hdr
->lseg
);
1655 if (end_pos
> nfsi
->layout
->plh_lwb
)
1656 nfsi
->layout
->plh_lwb
= end_pos
;
1657 spin_unlock(&inode
->i_lock
);
1658 dprintk("%s: lseg %p end_pos %llu\n",
1659 __func__
, hdr
->lseg
, nfsi
->layout
->plh_lwb
);
1661 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
1662 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
1664 mark_inode_dirty_sync(inode
);
1666 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit
);
1668 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data
*data
)
1670 struct nfs_server
*nfss
= NFS_SERVER(data
->args
.inode
);
1672 if (nfss
->pnfs_curr_ld
->cleanup_layoutcommit
)
1673 nfss
->pnfs_curr_ld
->cleanup_layoutcommit(data
);
1677 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
1678 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
1679 * data to disk to allow the server to recover the data if it crashes.
1680 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
1681 * is off, and a COMMIT is sent to a data server, or
1682 * if WRITEs to a data server return NFS_DATA_SYNC.
1685 pnfs_layoutcommit_inode(struct inode
*inode
, bool sync
)
1687 struct nfs4_layoutcommit_data
*data
;
1688 struct nfs_inode
*nfsi
= NFS_I(inode
);
1692 dprintk("--> %s inode %lu\n", __func__
, inode
->i_ino
);
1694 if (!test_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
))
1697 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
1698 data
= kzalloc(sizeof(*data
), GFP_NOFS
);
1704 if (!test_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
))
1707 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING
, &nfsi
->flags
)) {
1712 status
= wait_on_bit_lock(&nfsi
->flags
, NFS_INO_LAYOUTCOMMITTING
,
1713 nfs_wait_bit_killable
, TASK_KILLABLE
);
1718 INIT_LIST_HEAD(&data
->lseg_list
);
1719 spin_lock(&inode
->i_lock
);
1720 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
)) {
1721 clear_bit(NFS_INO_LAYOUTCOMMITTING
, &nfsi
->flags
);
1722 spin_unlock(&inode
->i_lock
);
1723 wake_up_bit(&nfsi
->flags
, NFS_INO_LAYOUTCOMMITTING
);
1727 pnfs_list_write_lseg(inode
, &data
->lseg_list
);
1729 end_pos
= nfsi
->layout
->plh_lwb
;
1730 nfsi
->layout
->plh_lwb
= 0;
1732 nfs4_stateid_copy(&data
->args
.stateid
, &nfsi
->layout
->plh_stateid
);
1733 spin_unlock(&inode
->i_lock
);
1735 data
->args
.inode
= inode
;
1736 data
->cred
= get_rpccred(nfsi
->layout
->plh_lc_cred
);
1737 nfs_fattr_init(&data
->fattr
);
1738 data
->args
.bitmask
= NFS_SERVER(inode
)->cache_consistency_bitmask
;
1739 data
->res
.fattr
= &data
->fattr
;
1740 data
->args
.lastbytewritten
= end_pos
- 1;
1741 data
->res
.server
= NFS_SERVER(inode
);
1743 status
= nfs4_proc_layoutcommit(data
, sync
);
1746 mark_inode_dirty_sync(inode
);
1747 dprintk("<-- %s status %d\n", __func__
, status
);
1754 struct nfs4_threshold
*pnfs_mdsthreshold_alloc(void)
1756 struct nfs4_threshold
*thp
;
1758 thp
= kzalloc(sizeof(*thp
), GFP_NOFS
);
1760 dprintk("%s mdsthreshold allocation failed\n", __func__
);