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 pnfs_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 pnfs_put_layout_hdr_locked(struct pnfs_layout_hdr
*lo
)
226 if (atomic_dec_and_test(&lo
->plh_refcount
))
227 destroy_layout_hdr(lo
);
231 pnfs_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 pnfs_iomode_to_fail_bit(u32 iomode
)
244 return iomode
== IOMODE_RW
?
245 NFS_LAYOUT_RW_FAILED
: NFS_LAYOUT_RO_FAILED
;
249 pnfs_layout_io_set_failed(struct pnfs_layout_hdr
*lo
, u32 iomode
)
251 set_bit(pnfs_iomode_to_fail_bit(iomode
), &lo
->plh_flags
);
252 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__
,
253 iomode
== IOMODE_RW
? "RW" : "READ");
257 pnfs_layout_io_test_failed(struct pnfs_layout_hdr
*lo
, u32 iomode
)
259 return test_bit(pnfs_iomode_to_fail_bit(iomode
), &lo
->plh_flags
) != 0;
263 init_lseg(struct pnfs_layout_hdr
*lo
, struct pnfs_layout_segment
*lseg
)
265 INIT_LIST_HEAD(&lseg
->pls_list
);
266 INIT_LIST_HEAD(&lseg
->pls_lc_list
);
267 atomic_set(&lseg
->pls_refcount
, 1);
269 set_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
);
270 lseg
->pls_layout
= lo
;
273 static void free_lseg(struct pnfs_layout_segment
*lseg
)
275 struct inode
*ino
= lseg
->pls_layout
->plh_inode
;
277 NFS_SERVER(ino
)->pnfs_curr_ld
->free_lseg(lseg
);
278 /* Matched by pnfs_get_layout_hdr in pnfs_insert_layout */
279 pnfs_put_layout_hdr(NFS_I(ino
)->layout
);
283 pnfs_put_lseg_common(struct pnfs_layout_segment
*lseg
)
285 struct inode
*inode
= lseg
->pls_layout
->plh_inode
;
287 WARN_ON(test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
));
288 list_del_init(&lseg
->pls_list
);
289 if (list_empty(&lseg
->pls_layout
->plh_segs
)) {
290 set_bit(NFS_LAYOUT_DESTROYED
, &lseg
->pls_layout
->plh_flags
);
291 /* Matched by initial refcount set in alloc_init_layout_hdr */
292 pnfs_put_layout_hdr_locked(lseg
->pls_layout
);
294 rpc_wake_up(&NFS_SERVER(inode
)->roc_rpcwaitq
);
298 pnfs_put_lseg(struct pnfs_layout_segment
*lseg
)
305 dprintk("%s: lseg %p ref %d valid %d\n", __func__
, lseg
,
306 atomic_read(&lseg
->pls_refcount
),
307 test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
));
308 inode
= lseg
->pls_layout
->plh_inode
;
309 if (atomic_dec_and_lock(&lseg
->pls_refcount
, &inode
->i_lock
)) {
312 pnfs_put_lseg_common(lseg
);
313 list_add(&lseg
->pls_list
, &free_me
);
314 spin_unlock(&inode
->i_lock
);
315 pnfs_free_lseg_list(&free_me
);
318 EXPORT_SYMBOL_GPL(pnfs_put_lseg
);
321 end_offset(u64 start
, u64 len
)
326 return end
>= start
? end
: NFS4_MAX_UINT64
;
329 /* last octet in a range */
331 last_byte_offset(u64 start
, u64 len
)
337 return end
> start
? end
- 1 : NFS4_MAX_UINT64
;
341 * is l2 fully contained in l1?
343 * [----------------------------------)
348 lo_seg_contained(struct pnfs_layout_range
*l1
,
349 struct pnfs_layout_range
*l2
)
351 u64 start1
= l1
->offset
;
352 u64 end1
= end_offset(start1
, l1
->length
);
353 u64 start2
= l2
->offset
;
354 u64 end2
= end_offset(start2
, l2
->length
);
356 return (start1
<= start2
) && (end1
>= end2
);
360 * is l1 and l2 intersecting?
362 * [----------------------------------)
367 lo_seg_intersecting(struct pnfs_layout_range
*l1
,
368 struct pnfs_layout_range
*l2
)
370 u64 start1
= l1
->offset
;
371 u64 end1
= end_offset(start1
, l1
->length
);
372 u64 start2
= l2
->offset
;
373 u64 end2
= end_offset(start2
, l2
->length
);
375 return (end1
== NFS4_MAX_UINT64
|| end1
> start2
) &&
376 (end2
== NFS4_MAX_UINT64
|| end2
> start1
);
380 should_free_lseg(struct pnfs_layout_range
*lseg_range
,
381 struct pnfs_layout_range
*recall_range
)
383 return (recall_range
->iomode
== IOMODE_ANY
||
384 lseg_range
->iomode
== recall_range
->iomode
) &&
385 lo_seg_intersecting(lseg_range
, recall_range
);
388 /* Returns 1 if lseg is removed from list, 0 otherwise */
389 static int mark_lseg_invalid(struct pnfs_layout_segment
*lseg
,
390 struct list_head
*tmp_list
)
394 if (test_and_clear_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
)) {
395 /* Remove the reference keeping the lseg in the
396 * list. It will now be removed when all
397 * outstanding io is finished.
399 dprintk("%s: lseg %p ref %d\n", __func__
, lseg
,
400 atomic_read(&lseg
->pls_refcount
));
401 if (atomic_dec_and_test(&lseg
->pls_refcount
)) {
402 pnfs_put_lseg_common(lseg
);
403 list_add(&lseg
->pls_list
, tmp_list
);
410 /* Returns count of number of matching invalid lsegs remaining in list
414 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr
*lo
,
415 struct list_head
*tmp_list
,
416 struct pnfs_layout_range
*recall_range
)
418 struct pnfs_layout_segment
*lseg
, *next
;
419 int invalid
= 0, removed
= 0;
421 dprintk("%s:Begin lo %p\n", __func__
, lo
);
423 if (list_empty(&lo
->plh_segs
)) {
424 /* Reset MDS Threshold I/O counters */
425 NFS_I(lo
->plh_inode
)->write_io
= 0;
426 NFS_I(lo
->plh_inode
)->read_io
= 0;
427 if (!test_and_set_bit(NFS_LAYOUT_DESTROYED
, &lo
->plh_flags
))
428 pnfs_put_layout_hdr_locked(lo
);
431 list_for_each_entry_safe(lseg
, next
, &lo
->plh_segs
, pls_list
)
433 should_free_lseg(&lseg
->pls_range
, recall_range
)) {
434 dprintk("%s: freeing lseg %p iomode %d "
435 "offset %llu length %llu\n", __func__
,
436 lseg
, lseg
->pls_range
.iomode
, lseg
->pls_range
.offset
,
437 lseg
->pls_range
.length
);
439 removed
+= mark_lseg_invalid(lseg
, tmp_list
);
441 dprintk("%s:Return %i\n", __func__
, invalid
- removed
);
442 return invalid
- removed
;
445 /* note free_me must contain lsegs from a single layout_hdr */
447 pnfs_free_lseg_list(struct list_head
*free_me
)
449 struct pnfs_layout_segment
*lseg
, *tmp
;
450 struct pnfs_layout_hdr
*lo
;
452 if (list_empty(free_me
))
455 lo
= list_first_entry(free_me
, struct pnfs_layout_segment
,
456 pls_list
)->pls_layout
;
458 if (test_bit(NFS_LAYOUT_DESTROYED
, &lo
->plh_flags
)) {
459 struct nfs_client
*clp
;
461 clp
= NFS_SERVER(lo
->plh_inode
)->nfs_client
;
462 spin_lock(&clp
->cl_lock
);
463 list_del_init(&lo
->plh_layouts
);
464 spin_unlock(&clp
->cl_lock
);
466 list_for_each_entry_safe(lseg
, tmp
, free_me
, pls_list
) {
467 list_del(&lseg
->pls_list
);
473 pnfs_destroy_layout(struct nfs_inode
*nfsi
)
475 struct pnfs_layout_hdr
*lo
;
478 spin_lock(&nfsi
->vfs_inode
.i_lock
);
481 lo
->plh_block_lgets
++; /* permanently block new LAYOUTGETs */
482 pnfs_mark_matching_lsegs_invalid(lo
, &tmp_list
, NULL
);
484 spin_unlock(&nfsi
->vfs_inode
.i_lock
);
485 pnfs_free_lseg_list(&tmp_list
);
487 EXPORT_SYMBOL_GPL(pnfs_destroy_layout
);
490 * Called by the state manger to remove all layouts established under an
494 pnfs_destroy_all_layouts(struct nfs_client
*clp
)
496 struct nfs_server
*server
;
497 struct pnfs_layout_hdr
*lo
;
500 nfs4_deviceid_mark_client_invalid(clp
);
501 nfs4_deviceid_purge_client(clp
);
503 spin_lock(&clp
->cl_lock
);
505 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
506 if (!list_empty(&server
->layouts
))
507 list_splice_init(&server
->layouts
, &tmp_list
);
510 spin_unlock(&clp
->cl_lock
);
512 while (!list_empty(&tmp_list
)) {
513 lo
= list_entry(tmp_list
.next
, struct pnfs_layout_hdr
,
515 dprintk("%s freeing layout for inode %lu\n", __func__
,
516 lo
->plh_inode
->i_ino
);
517 list_del_init(&lo
->plh_layouts
);
518 pnfs_destroy_layout(NFS_I(lo
->plh_inode
));
522 /* update lo->plh_stateid with new if is more recent */
524 pnfs_set_layout_stateid(struct pnfs_layout_hdr
*lo
, const nfs4_stateid
*new,
529 oldseq
= be32_to_cpu(lo
->plh_stateid
.seqid
);
530 newseq
= be32_to_cpu(new->seqid
);
531 if ((int)(newseq
- oldseq
) > 0) {
532 nfs4_stateid_copy(&lo
->plh_stateid
, new);
533 if (update_barrier
) {
534 u32 new_barrier
= be32_to_cpu(new->seqid
);
536 if ((int)(new_barrier
- lo
->plh_barrier
))
537 lo
->plh_barrier
= new_barrier
;
539 /* Because of wraparound, we want to keep the barrier
540 * "close" to the current seqids. It needs to be
541 * within 2**31 to count as "behind", so if it
542 * gets too near that limit, give us a litle leeway
543 * and bring it to within 2**30.
544 * NOTE - and yes, this is all unsigned arithmetic.
546 if (unlikely((newseq
- lo
->plh_barrier
) > (3 << 29)))
547 lo
->plh_barrier
= newseq
- (1 << 30);
552 /* lget is set to 1 if called from inside send_layoutget call chain */
554 pnfs_layoutgets_blocked(struct pnfs_layout_hdr
*lo
, nfs4_stateid
*stateid
,
558 (int)(lo
->plh_barrier
- be32_to_cpu(stateid
->seqid
)) >= 0)
560 return lo
->plh_block_lgets
||
561 test_bit(NFS_LAYOUT_DESTROYED
, &lo
->plh_flags
) ||
562 test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
) ||
563 (list_empty(&lo
->plh_segs
) &&
564 (atomic_read(&lo
->plh_outstanding
) > lget
));
568 pnfs_choose_layoutget_stateid(nfs4_stateid
*dst
, struct pnfs_layout_hdr
*lo
,
569 struct nfs4_state
*open_state
)
573 dprintk("--> %s\n", __func__
);
574 spin_lock(&lo
->plh_inode
->i_lock
);
575 if (pnfs_layoutgets_blocked(lo
, NULL
, 1)) {
577 } else if (list_empty(&lo
->plh_segs
)) {
581 seq
= read_seqbegin(&open_state
->seqlock
);
582 nfs4_stateid_copy(dst
, &open_state
->stateid
);
583 } while (read_seqretry(&open_state
->seqlock
, seq
));
585 nfs4_stateid_copy(dst
, &lo
->plh_stateid
);
586 spin_unlock(&lo
->plh_inode
->i_lock
);
587 dprintk("<-- %s\n", __func__
);
592 * Get layout from server.
593 * for now, assume that whole file layouts are requested.
595 * arg->length: all ones
597 static struct pnfs_layout_segment
*
598 send_layoutget(struct pnfs_layout_hdr
*lo
,
599 struct nfs_open_context
*ctx
,
600 struct pnfs_layout_range
*range
,
603 struct inode
*ino
= lo
->plh_inode
;
604 struct nfs_server
*server
= NFS_SERVER(ino
);
605 struct nfs4_layoutget
*lgp
;
606 struct pnfs_layout_segment
*lseg
;
608 dprintk("--> %s\n", __func__
);
611 lgp
= kzalloc(sizeof(*lgp
), gfp_flags
);
615 lgp
->args
.minlength
= PAGE_CACHE_SIZE
;
616 if (lgp
->args
.minlength
> range
->length
)
617 lgp
->args
.minlength
= range
->length
;
618 lgp
->args
.maxcount
= PNFS_LAYOUT_MAXSIZE
;
619 lgp
->args
.range
= *range
;
620 lgp
->args
.type
= server
->pnfs_curr_ld
->id
;
621 lgp
->args
.inode
= ino
;
622 lgp
->args
.ctx
= get_nfs_open_context(ctx
);
623 lgp
->gfp_flags
= gfp_flags
;
625 /* Synchronously retrieve layout information from server and
628 lseg
= nfs4_proc_layoutget(lgp
, gfp_flags
);
630 switch (PTR_ERR(lseg
)) {
635 /* remember that LAYOUTGET failed and suspend trying */
636 pnfs_layout_io_set_failed(lo
, range
->iomode
);
645 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
646 * when the layout segment list is empty.
648 * Note that a pnfs_layout_hdr can exist with an empty layout segment
649 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
650 * deviceid is marked invalid.
653 _pnfs_return_layout(struct inode
*ino
)
655 struct pnfs_layout_hdr
*lo
= NULL
;
656 struct nfs_inode
*nfsi
= NFS_I(ino
);
658 struct nfs4_layoutreturn
*lrp
;
659 nfs4_stateid stateid
;
660 int status
= 0, empty
;
662 dprintk("NFS: %s for inode %lu\n", __func__
, ino
->i_ino
);
664 spin_lock(&ino
->i_lock
);
666 if (!lo
|| pnfs_test_layout_returned(lo
)) {
667 spin_unlock(&ino
->i_lock
);
668 dprintk("NFS: %s no layout to return\n", __func__
);
671 stateid
= nfsi
->layout
->plh_stateid
;
672 /* Reference matched in nfs4_layoutreturn_release */
673 pnfs_get_layout_hdr(lo
);
674 empty
= list_empty(&lo
->plh_segs
);
675 pnfs_mark_matching_lsegs_invalid(lo
, &tmp_list
, NULL
);
676 /* Don't send a LAYOUTRETURN if list was initially empty */
678 spin_unlock(&ino
->i_lock
);
679 pnfs_put_layout_hdr(lo
);
680 dprintk("NFS: %s no layout segments to return\n", __func__
);
683 lo
->plh_block_lgets
++;
684 pnfs_mark_layout_returned(lo
);
685 spin_unlock(&ino
->i_lock
);
686 pnfs_free_lseg_list(&tmp_list
);
688 WARN_ON(test_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
));
690 lrp
= kzalloc(sizeof(*lrp
), GFP_KERNEL
);
691 if (unlikely(lrp
== NULL
)) {
693 pnfs_layout_io_set_failed(lo
, IOMODE_RW
);
694 pnfs_layout_io_set_failed(lo
, IOMODE_READ
);
695 pnfs_clear_layout_returned(lo
);
696 pnfs_put_layout_hdr(lo
);
700 lrp
->args
.stateid
= stateid
;
701 lrp
->args
.layout_type
= NFS_SERVER(ino
)->pnfs_curr_ld
->id
;
702 lrp
->args
.inode
= ino
;
703 lrp
->args
.layout
= lo
;
704 lrp
->clp
= NFS_SERVER(ino
)->nfs_client
;
706 status
= nfs4_proc_layoutreturn(lrp
);
708 dprintk("<-- %s status: %d\n", __func__
, status
);
711 EXPORT_SYMBOL_GPL(_pnfs_return_layout
);
713 bool pnfs_roc(struct inode
*ino
)
715 struct pnfs_layout_hdr
*lo
;
716 struct pnfs_layout_segment
*lseg
, *tmp
;
720 spin_lock(&ino
->i_lock
);
721 lo
= NFS_I(ino
)->layout
;
722 if (!lo
|| !test_and_clear_bit(NFS_LAYOUT_ROC
, &lo
->plh_flags
) ||
723 test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
))
725 list_for_each_entry_safe(lseg
, tmp
, &lo
->plh_segs
, pls_list
)
726 if (test_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
)) {
727 mark_lseg_invalid(lseg
, &tmp_list
);
732 lo
->plh_block_lgets
++;
733 pnfs_get_layout_hdr(lo
); /* matched in pnfs_roc_release */
734 spin_unlock(&ino
->i_lock
);
735 pnfs_free_lseg_list(&tmp_list
);
739 spin_unlock(&ino
->i_lock
);
743 void pnfs_roc_release(struct inode
*ino
)
745 struct pnfs_layout_hdr
*lo
;
747 spin_lock(&ino
->i_lock
);
748 lo
= NFS_I(ino
)->layout
;
749 lo
->plh_block_lgets
--;
750 pnfs_put_layout_hdr_locked(lo
);
751 spin_unlock(&ino
->i_lock
);
754 void pnfs_roc_set_barrier(struct inode
*ino
, u32 barrier
)
756 struct pnfs_layout_hdr
*lo
;
758 spin_lock(&ino
->i_lock
);
759 lo
= NFS_I(ino
)->layout
;
760 if ((int)(barrier
- lo
->plh_barrier
) > 0)
761 lo
->plh_barrier
= barrier
;
762 spin_unlock(&ino
->i_lock
);
765 bool pnfs_roc_drain(struct inode
*ino
, u32
*barrier
)
767 struct nfs_inode
*nfsi
= NFS_I(ino
);
768 struct pnfs_layout_segment
*lseg
;
771 spin_lock(&ino
->i_lock
);
772 list_for_each_entry(lseg
, &nfsi
->layout
->plh_segs
, pls_list
)
773 if (test_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
)) {
778 struct pnfs_layout_hdr
*lo
= nfsi
->layout
;
779 u32 current_seqid
= be32_to_cpu(lo
->plh_stateid
.seqid
);
781 /* Since close does not return a layout stateid for use as
782 * a barrier, we choose the worst-case barrier.
784 *barrier
= current_seqid
+ atomic_read(&lo
->plh_outstanding
);
786 spin_unlock(&ino
->i_lock
);
791 * Compare two layout segments for sorting into layout cache.
792 * We want to preferentially return RW over RO layouts, so ensure those
796 cmp_layout(struct pnfs_layout_range
*l1
,
797 struct pnfs_layout_range
*l2
)
801 /* high offset > low offset */
802 d
= l1
->offset
- l2
->offset
;
806 /* short length > long length */
807 d
= l2
->length
- l1
->length
;
811 /* read > read/write */
812 return (int)(l1
->iomode
== IOMODE_READ
) - (int)(l2
->iomode
== IOMODE_READ
);
816 pnfs_insert_layout(struct pnfs_layout_hdr
*lo
,
817 struct pnfs_layout_segment
*lseg
)
819 struct pnfs_layout_segment
*lp
;
821 dprintk("%s:Begin\n", __func__
);
823 assert_spin_locked(&lo
->plh_inode
->i_lock
);
824 list_for_each_entry(lp
, &lo
->plh_segs
, pls_list
) {
825 if (cmp_layout(&lseg
->pls_range
, &lp
->pls_range
) > 0)
827 list_add_tail(&lseg
->pls_list
, &lp
->pls_list
);
828 dprintk("%s: inserted lseg %p "
829 "iomode %d offset %llu length %llu before "
830 "lp %p iomode %d offset %llu length %llu\n",
831 __func__
, lseg
, lseg
->pls_range
.iomode
,
832 lseg
->pls_range
.offset
, lseg
->pls_range
.length
,
833 lp
, lp
->pls_range
.iomode
, lp
->pls_range
.offset
,
834 lp
->pls_range
.length
);
837 list_add_tail(&lseg
->pls_list
, &lo
->plh_segs
);
838 dprintk("%s: inserted lseg %p "
839 "iomode %d offset %llu length %llu at tail\n",
840 __func__
, lseg
, lseg
->pls_range
.iomode
,
841 lseg
->pls_range
.offset
, lseg
->pls_range
.length
);
843 pnfs_get_layout_hdr(lo
);
845 dprintk("%s:Return\n", __func__
);
848 static struct pnfs_layout_hdr
*
849 alloc_init_layout_hdr(struct inode
*ino
,
850 struct nfs_open_context
*ctx
,
853 struct pnfs_layout_hdr
*lo
;
855 lo
= pnfs_alloc_layout_hdr(ino
, gfp_flags
);
858 atomic_set(&lo
->plh_refcount
, 1);
859 INIT_LIST_HEAD(&lo
->plh_layouts
);
860 INIT_LIST_HEAD(&lo
->plh_segs
);
861 INIT_LIST_HEAD(&lo
->plh_bulk_recall
);
863 lo
->plh_lc_cred
= get_rpccred(ctx
->state
->owner
->so_cred
);
867 static struct pnfs_layout_hdr
*
868 pnfs_find_alloc_layout(struct inode
*ino
,
869 struct nfs_open_context
*ctx
,
872 struct nfs_inode
*nfsi
= NFS_I(ino
);
873 struct pnfs_layout_hdr
*new = NULL
;
875 dprintk("%s Begin ino=%p layout=%p\n", __func__
, ino
, nfsi
->layout
);
877 assert_spin_locked(&ino
->i_lock
);
879 if (test_bit(NFS_LAYOUT_DESTROYED
, &nfsi
->layout
->plh_flags
))
884 spin_unlock(&ino
->i_lock
);
885 new = alloc_init_layout_hdr(ino
, ctx
, gfp_flags
);
886 spin_lock(&ino
->i_lock
);
888 if (likely(nfsi
->layout
== NULL
)) /* Won the race? */
891 pnfs_free_layout_hdr(new);
896 * iomode matching rules:
907 is_matching_lseg(struct pnfs_layout_range
*ls_range
,
908 struct pnfs_layout_range
*range
)
910 struct pnfs_layout_range range1
;
912 if ((range
->iomode
== IOMODE_RW
&&
913 ls_range
->iomode
!= IOMODE_RW
) ||
914 !lo_seg_intersecting(ls_range
, range
))
917 /* range1 covers only the first byte in the range */
920 return lo_seg_contained(ls_range
, &range1
);
924 * lookup range in layout
926 static struct pnfs_layout_segment
*
927 pnfs_find_lseg(struct pnfs_layout_hdr
*lo
,
928 struct pnfs_layout_range
*range
)
930 struct pnfs_layout_segment
*lseg
, *ret
= NULL
;
932 dprintk("%s:Begin\n", __func__
);
934 assert_spin_locked(&lo
->plh_inode
->i_lock
);
935 list_for_each_entry(lseg
, &lo
->plh_segs
, pls_list
) {
936 if (test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
) &&
937 is_matching_lseg(&lseg
->pls_range
, range
)) {
938 ret
= pnfs_get_lseg(lseg
);
941 if (lseg
->pls_range
.offset
> range
->offset
)
945 dprintk("%s:Return lseg %p ref %d\n",
946 __func__
, ret
, ret
? atomic_read(&ret
->pls_refcount
) : 0);
951 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
952 * to the MDS or over pNFS
954 * The nfs_inode read_io and write_io fields are cumulative counters reset
955 * when there are no layout segments. Note that in pnfs_update_layout iomode
956 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
959 * A return of true means use MDS I/O.
962 * If a file's size is smaller than the file size threshold, data accesses
963 * SHOULD be sent to the metadata server. If an I/O request has a length that
964 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
965 * server. If both file size and I/O size are provided, the client SHOULD
966 * reach or exceed both thresholds before sending its read or write
967 * requests to the data server.
969 static bool pnfs_within_mdsthreshold(struct nfs_open_context
*ctx
,
970 struct inode
*ino
, int iomode
)
972 struct nfs4_threshold
*t
= ctx
->mdsthreshold
;
973 struct nfs_inode
*nfsi
= NFS_I(ino
);
974 loff_t fsize
= i_size_read(ino
);
975 bool size
= false, size_set
= false, io
= false, io_set
= false, ret
= false;
980 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
981 __func__
, t
->bm
, t
->rd_sz
, t
->wr_sz
, t
->rd_io_sz
, t
->wr_io_sz
);
985 if (t
->bm
& THRESHOLD_RD
) {
986 dprintk("%s fsize %llu\n", __func__
, fsize
);
988 if (fsize
< t
->rd_sz
)
991 if (t
->bm
& THRESHOLD_RD_IO
) {
992 dprintk("%s nfsi->read_io %llu\n", __func__
,
995 if (nfsi
->read_io
< t
->rd_io_sz
)
1000 if (t
->bm
& THRESHOLD_WR
) {
1001 dprintk("%s fsize %llu\n", __func__
, fsize
);
1003 if (fsize
< t
->wr_sz
)
1006 if (t
->bm
& THRESHOLD_WR_IO
) {
1007 dprintk("%s nfsi->write_io %llu\n", __func__
,
1010 if (nfsi
->write_io
< t
->wr_io_sz
)
1015 if (size_set
&& io_set
) {
1018 } else if (size
|| io
)
1021 dprintk("<-- %s size %d io %d ret %d\n", __func__
, size
, io
, ret
);
1026 * Layout segment is retreived from the server if not cached.
1027 * The appropriate layout segment is referenced and returned to the caller.
1029 struct pnfs_layout_segment
*
1030 pnfs_update_layout(struct inode
*ino
,
1031 struct nfs_open_context
*ctx
,
1034 enum pnfs_iomode iomode
,
1037 struct pnfs_layout_range arg
= {
1043 struct nfs_server
*server
= NFS_SERVER(ino
);
1044 struct nfs_client
*clp
= server
->nfs_client
;
1045 struct pnfs_layout_hdr
*lo
;
1046 struct pnfs_layout_segment
*lseg
= NULL
;
1049 if (!pnfs_enabled_sb(NFS_SERVER(ino
)))
1052 if (pnfs_within_mdsthreshold(ctx
, ino
, iomode
))
1055 spin_lock(&ino
->i_lock
);
1056 lo
= pnfs_find_alloc_layout(ino
, ctx
, gfp_flags
);
1060 /* Do we even need to bother with this? */
1061 if (test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
)) {
1062 dprintk("%s matches recall, use MDS\n", __func__
);
1066 /* if LAYOUTGET already failed once we don't try again */
1067 if (pnfs_layout_io_test_failed(lo
, iomode
))
1070 /* Check to see if the layout for the given range already exists */
1071 lseg
= pnfs_find_lseg(lo
, &arg
);
1075 if (pnfs_layoutgets_blocked(lo
, NULL
, 0))
1077 atomic_inc(&lo
->plh_outstanding
);
1079 pnfs_get_layout_hdr(lo
);
1080 if (list_empty(&lo
->plh_segs
))
1083 /* Enable LAYOUTRETURNs */
1084 pnfs_clear_layout_returned(lo
);
1086 spin_unlock(&ino
->i_lock
);
1088 /* The lo must be on the clp list if there is any
1089 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1091 spin_lock(&clp
->cl_lock
);
1092 BUG_ON(!list_empty(&lo
->plh_layouts
));
1093 list_add_tail(&lo
->plh_layouts
, &server
->layouts
);
1094 spin_unlock(&clp
->cl_lock
);
1097 pg_offset
= arg
.offset
& ~PAGE_CACHE_MASK
;
1099 arg
.offset
-= pg_offset
;
1100 arg
.length
+= pg_offset
;
1102 if (arg
.length
!= NFS4_MAX_UINT64
)
1103 arg
.length
= PAGE_CACHE_ALIGN(arg
.length
);
1105 lseg
= send_layoutget(lo
, ctx
, &arg
, gfp_flags
);
1106 if (!lseg
&& first
) {
1107 spin_lock(&clp
->cl_lock
);
1108 list_del_init(&lo
->plh_layouts
);
1109 spin_unlock(&clp
->cl_lock
);
1111 atomic_dec(&lo
->plh_outstanding
);
1112 pnfs_put_layout_hdr(lo
);
1114 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1115 "(%s, offset: %llu, length: %llu)\n",
1116 __func__
, ino
->i_sb
->s_id
,
1117 (unsigned long long)NFS_FILEID(ino
),
1118 lseg
== NULL
? "not found" : "found",
1119 iomode
==IOMODE_RW
? "read/write" : "read-only",
1120 (unsigned long long)pos
,
1121 (unsigned long long)count
);
1124 spin_unlock(&ino
->i_lock
);
1127 EXPORT_SYMBOL_GPL(pnfs_update_layout
);
1129 struct pnfs_layout_segment
*
1130 pnfs_layout_process(struct nfs4_layoutget
*lgp
)
1132 struct pnfs_layout_hdr
*lo
= NFS_I(lgp
->args
.inode
)->layout
;
1133 struct nfs4_layoutget_res
*res
= &lgp
->res
;
1134 struct pnfs_layout_segment
*lseg
;
1135 struct inode
*ino
= lo
->plh_inode
;
1138 /* Inject layout blob into I/O device driver */
1139 lseg
= NFS_SERVER(ino
)->pnfs_curr_ld
->alloc_lseg(lo
, res
, lgp
->gfp_flags
);
1140 if (!lseg
|| IS_ERR(lseg
)) {
1144 status
= PTR_ERR(lseg
);
1145 dprintk("%s: Could not allocate layout: error %d\n",
1150 spin_lock(&ino
->i_lock
);
1151 if (test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
)) {
1152 dprintk("%s forget reply due to recall\n", __func__
);
1153 goto out_forget_reply
;
1156 if (pnfs_layoutgets_blocked(lo
, &res
->stateid
, 1)) {
1157 dprintk("%s forget reply due to state\n", __func__
);
1158 goto out_forget_reply
;
1160 init_lseg(lo
, lseg
);
1161 lseg
->pls_range
= res
->range
;
1162 pnfs_get_lseg(lseg
);
1163 pnfs_insert_layout(lo
, lseg
);
1165 if (res
->return_on_close
) {
1166 set_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
);
1167 set_bit(NFS_LAYOUT_ROC
, &lo
->plh_flags
);
1170 /* Done processing layoutget. Set the layout stateid */
1171 pnfs_set_layout_stateid(lo
, &res
->stateid
, false);
1172 spin_unlock(&ino
->i_lock
);
1175 return ERR_PTR(status
);
1178 spin_unlock(&ino
->i_lock
);
1179 lseg
->pls_layout
= lo
;
1180 NFS_SERVER(ino
)->pnfs_curr_ld
->free_lseg(lseg
);
1185 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*req
)
1187 BUG_ON(pgio
->pg_lseg
!= NULL
);
1189 if (req
->wb_offset
!= req
->wb_pgbase
) {
1190 nfs_pageio_reset_read_mds(pgio
);
1193 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
1199 /* If no lseg, fall back to read through mds */
1200 if (pgio
->pg_lseg
== NULL
)
1201 nfs_pageio_reset_read_mds(pgio
);
1204 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read
);
1207 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*req
)
1209 BUG_ON(pgio
->pg_lseg
!= NULL
);
1211 if (req
->wb_offset
!= req
->wb_pgbase
) {
1212 nfs_pageio_reset_write_mds(pgio
);
1215 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
1221 /* If no lseg, fall back to write through mds */
1222 if (pgio
->pg_lseg
== NULL
)
1223 nfs_pageio_reset_write_mds(pgio
);
1225 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write
);
1228 pnfs_pageio_init_read(struct nfs_pageio_descriptor
*pgio
, struct inode
*inode
,
1229 const struct nfs_pgio_completion_ops
*compl_ops
)
1231 struct nfs_server
*server
= NFS_SERVER(inode
);
1232 struct pnfs_layoutdriver_type
*ld
= server
->pnfs_curr_ld
;
1235 nfs_pageio_init_read(pgio
, inode
, compl_ops
);
1237 nfs_pageio_init(pgio
, inode
, ld
->pg_read_ops
, compl_ops
, server
->rsize
, 0);
1241 pnfs_pageio_init_write(struct nfs_pageio_descriptor
*pgio
, struct inode
*inode
,
1243 const struct nfs_pgio_completion_ops
*compl_ops
)
1245 struct nfs_server
*server
= NFS_SERVER(inode
);
1246 struct pnfs_layoutdriver_type
*ld
= server
->pnfs_curr_ld
;
1249 nfs_pageio_init_write(pgio
, inode
, ioflags
, compl_ops
);
1251 nfs_pageio_init(pgio
, inode
, ld
->pg_write_ops
, compl_ops
, server
->wsize
, ioflags
);
1255 pnfs_generic_pg_test(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*prev
,
1256 struct nfs_page
*req
)
1258 if (pgio
->pg_lseg
== NULL
)
1259 return nfs_generic_pg_test(pgio
, prev
, req
);
1262 * Test if a nfs_page is fully contained in the pnfs_layout_range.
1263 * Note that this test makes several assumptions:
1264 * - that the previous nfs_page in the struct nfs_pageio_descriptor
1265 * is known to lie within the range.
1266 * - that the nfs_page being tested is known to be contiguous with the
1267 * previous nfs_page.
1268 * - Layout ranges are page aligned, so we only have to test the
1269 * start offset of the request.
1271 * Please also note that 'end_offset' is actually the offset of the
1272 * first byte that lies outside the pnfs_layout_range. FIXME?
1275 return req_offset(req
) < end_offset(pgio
->pg_lseg
->pls_range
.offset
,
1276 pgio
->pg_lseg
->pls_range
.length
);
1278 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test
);
1280 int pnfs_write_done_resend_to_mds(struct inode
*inode
,
1281 struct list_head
*head
,
1282 const struct nfs_pgio_completion_ops
*compl_ops
)
1284 struct nfs_pageio_descriptor pgio
;
1287 /* Resend all requests through the MDS */
1288 nfs_pageio_init_write(&pgio
, inode
, FLUSH_STABLE
, compl_ops
);
1289 while (!list_empty(head
)) {
1290 struct nfs_page
*req
= nfs_list_entry(head
->next
);
1292 nfs_list_remove_request(req
);
1293 if (!nfs_pageio_add_request(&pgio
, req
))
1294 nfs_list_add_request(req
, &failed
);
1296 nfs_pageio_complete(&pgio
);
1298 if (!list_empty(&failed
)) {
1299 /* For some reason our attempt to resend pages. Mark the
1300 * overall send request as having failed, and let
1301 * nfs_writeback_release_full deal with the error.
1303 list_move(&failed
, head
);
1308 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds
);
1310 static void pnfs_ld_handle_write_error(struct nfs_write_data
*data
)
1312 struct nfs_pgio_header
*hdr
= data
->header
;
1314 dprintk("pnfs write error = %d\n", hdr
->pnfs_error
);
1315 if (NFS_SERVER(hdr
->inode
)->pnfs_curr_ld
->flags
&
1316 PNFS_LAYOUTRET_ON_ERROR
) {
1317 clear_bit(NFS_INO_LAYOUTCOMMIT
, &NFS_I(hdr
->inode
)->flags
);
1318 pnfs_return_layout(hdr
->inode
);
1320 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
))
1321 data
->task
.tk_status
= pnfs_write_done_resend_to_mds(hdr
->inode
,
1323 hdr
->completion_ops
);
1327 * Called by non rpc-based layout drivers
1329 void pnfs_ld_write_done(struct nfs_write_data
*data
)
1331 struct nfs_pgio_header
*hdr
= data
->header
;
1333 if (!hdr
->pnfs_error
) {
1334 pnfs_set_layoutcommit(data
);
1335 hdr
->mds_ops
->rpc_call_done(&data
->task
, data
);
1337 pnfs_ld_handle_write_error(data
);
1338 hdr
->mds_ops
->rpc_release(data
);
1340 EXPORT_SYMBOL_GPL(pnfs_ld_write_done
);
1343 pnfs_write_through_mds(struct nfs_pageio_descriptor
*desc
,
1344 struct nfs_write_data
*data
)
1346 struct nfs_pgio_header
*hdr
= data
->header
;
1348 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
1349 list_splice_tail_init(&hdr
->pages
, &desc
->pg_list
);
1350 nfs_pageio_reset_write_mds(desc
);
1351 desc
->pg_recoalesce
= 1;
1353 nfs_writedata_release(data
);
1356 static enum pnfs_try_status
1357 pnfs_try_to_write_data(struct nfs_write_data
*wdata
,
1358 const struct rpc_call_ops
*call_ops
,
1359 struct pnfs_layout_segment
*lseg
,
1362 struct nfs_pgio_header
*hdr
= wdata
->header
;
1363 struct inode
*inode
= hdr
->inode
;
1364 enum pnfs_try_status trypnfs
;
1365 struct nfs_server
*nfss
= NFS_SERVER(inode
);
1367 hdr
->mds_ops
= call_ops
;
1369 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__
,
1370 inode
->i_ino
, wdata
->args
.count
, wdata
->args
.offset
, how
);
1371 trypnfs
= nfss
->pnfs_curr_ld
->write_pagelist(wdata
, how
);
1372 if (trypnfs
!= PNFS_NOT_ATTEMPTED
)
1373 nfs_inc_stats(inode
, NFSIOS_PNFS_WRITE
);
1374 dprintk("%s End (trypnfs:%d)\n", __func__
, trypnfs
);
1379 pnfs_do_multiple_writes(struct nfs_pageio_descriptor
*desc
, struct list_head
*head
, int how
)
1381 struct nfs_write_data
*data
;
1382 const struct rpc_call_ops
*call_ops
= desc
->pg_rpc_callops
;
1383 struct pnfs_layout_segment
*lseg
= desc
->pg_lseg
;
1385 desc
->pg_lseg
= NULL
;
1386 while (!list_empty(head
)) {
1387 enum pnfs_try_status trypnfs
;
1389 data
= list_first_entry(head
, struct nfs_write_data
, list
);
1390 list_del_init(&data
->list
);
1392 trypnfs
= pnfs_try_to_write_data(data
, call_ops
, lseg
, how
);
1393 if (trypnfs
== PNFS_NOT_ATTEMPTED
)
1394 pnfs_write_through_mds(desc
, data
);
1396 pnfs_put_lseg(lseg
);
1399 static void pnfs_writehdr_free(struct nfs_pgio_header
*hdr
)
1401 pnfs_put_lseg(hdr
->lseg
);
1402 nfs_writehdr_free(hdr
);
1404 EXPORT_SYMBOL_GPL(pnfs_writehdr_free
);
1407 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor
*desc
)
1409 struct nfs_write_header
*whdr
;
1410 struct nfs_pgio_header
*hdr
;
1413 whdr
= nfs_writehdr_alloc();
1415 desc
->pg_completion_ops
->error_cleanup(&desc
->pg_list
);
1416 pnfs_put_lseg(desc
->pg_lseg
);
1417 desc
->pg_lseg
= NULL
;
1420 hdr
= &whdr
->header
;
1421 nfs_pgheader_init(desc
, hdr
, pnfs_writehdr_free
);
1422 hdr
->lseg
= pnfs_get_lseg(desc
->pg_lseg
);
1423 atomic_inc(&hdr
->refcnt
);
1424 ret
= nfs_generic_flush(desc
, hdr
);
1426 pnfs_put_lseg(desc
->pg_lseg
);
1427 desc
->pg_lseg
= NULL
;
1429 pnfs_do_multiple_writes(desc
, &hdr
->rpc_list
, desc
->pg_ioflags
);
1430 if (atomic_dec_and_test(&hdr
->refcnt
))
1431 hdr
->completion_ops
->completion(hdr
);
1434 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages
);
1436 int pnfs_read_done_resend_to_mds(struct inode
*inode
,
1437 struct list_head
*head
,
1438 const struct nfs_pgio_completion_ops
*compl_ops
)
1440 struct nfs_pageio_descriptor pgio
;
1443 /* Resend all requests through the MDS */
1444 nfs_pageio_init_read(&pgio
, inode
, compl_ops
);
1445 while (!list_empty(head
)) {
1446 struct nfs_page
*req
= nfs_list_entry(head
->next
);
1448 nfs_list_remove_request(req
);
1449 if (!nfs_pageio_add_request(&pgio
, req
))
1450 nfs_list_add_request(req
, &failed
);
1452 nfs_pageio_complete(&pgio
);
1454 if (!list_empty(&failed
)) {
1455 list_move(&failed
, head
);
1460 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds
);
1462 static void pnfs_ld_handle_read_error(struct nfs_read_data
*data
)
1464 struct nfs_pgio_header
*hdr
= data
->header
;
1466 dprintk("pnfs read error = %d\n", hdr
->pnfs_error
);
1467 if (NFS_SERVER(hdr
->inode
)->pnfs_curr_ld
->flags
&
1468 PNFS_LAYOUTRET_ON_ERROR
) {
1469 clear_bit(NFS_INO_LAYOUTCOMMIT
, &NFS_I(hdr
->inode
)->flags
);
1470 pnfs_return_layout(hdr
->inode
);
1472 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
))
1473 data
->task
.tk_status
= pnfs_read_done_resend_to_mds(hdr
->inode
,
1475 hdr
->completion_ops
);
1479 * Called by non rpc-based layout drivers
1481 void pnfs_ld_read_done(struct nfs_read_data
*data
)
1483 struct nfs_pgio_header
*hdr
= data
->header
;
1485 if (likely(!hdr
->pnfs_error
)) {
1486 __nfs4_read_done_cb(data
);
1487 hdr
->mds_ops
->rpc_call_done(&data
->task
, data
);
1489 pnfs_ld_handle_read_error(data
);
1490 hdr
->mds_ops
->rpc_release(data
);
1492 EXPORT_SYMBOL_GPL(pnfs_ld_read_done
);
1495 pnfs_read_through_mds(struct nfs_pageio_descriptor
*desc
,
1496 struct nfs_read_data
*data
)
1498 struct nfs_pgio_header
*hdr
= data
->header
;
1500 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
1501 list_splice_tail_init(&hdr
->pages
, &desc
->pg_list
);
1502 nfs_pageio_reset_read_mds(desc
);
1503 desc
->pg_recoalesce
= 1;
1505 nfs_readdata_release(data
);
1509 * Call the appropriate parallel I/O subsystem read function.
1511 static enum pnfs_try_status
1512 pnfs_try_to_read_data(struct nfs_read_data
*rdata
,
1513 const struct rpc_call_ops
*call_ops
,
1514 struct pnfs_layout_segment
*lseg
)
1516 struct nfs_pgio_header
*hdr
= rdata
->header
;
1517 struct inode
*inode
= hdr
->inode
;
1518 struct nfs_server
*nfss
= NFS_SERVER(inode
);
1519 enum pnfs_try_status trypnfs
;
1521 hdr
->mds_ops
= call_ops
;
1523 dprintk("%s: Reading ino:%lu %u@%llu\n",
1524 __func__
, inode
->i_ino
, rdata
->args
.count
, rdata
->args
.offset
);
1526 trypnfs
= nfss
->pnfs_curr_ld
->read_pagelist(rdata
);
1527 if (trypnfs
!= PNFS_NOT_ATTEMPTED
)
1528 nfs_inc_stats(inode
, NFSIOS_PNFS_READ
);
1529 dprintk("%s End (trypnfs:%d)\n", __func__
, trypnfs
);
1534 pnfs_do_multiple_reads(struct nfs_pageio_descriptor
*desc
, struct list_head
*head
)
1536 struct nfs_read_data
*data
;
1537 const struct rpc_call_ops
*call_ops
= desc
->pg_rpc_callops
;
1538 struct pnfs_layout_segment
*lseg
= desc
->pg_lseg
;
1540 desc
->pg_lseg
= NULL
;
1541 while (!list_empty(head
)) {
1542 enum pnfs_try_status trypnfs
;
1544 data
= list_first_entry(head
, struct nfs_read_data
, list
);
1545 list_del_init(&data
->list
);
1547 trypnfs
= pnfs_try_to_read_data(data
, call_ops
, lseg
);
1548 if (trypnfs
== PNFS_NOT_ATTEMPTED
)
1549 pnfs_read_through_mds(desc
, data
);
1551 pnfs_put_lseg(lseg
);
1554 static void pnfs_readhdr_free(struct nfs_pgio_header
*hdr
)
1556 pnfs_put_lseg(hdr
->lseg
);
1557 nfs_readhdr_free(hdr
);
1559 EXPORT_SYMBOL_GPL(pnfs_readhdr_free
);
1562 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor
*desc
)
1564 struct nfs_read_header
*rhdr
;
1565 struct nfs_pgio_header
*hdr
;
1568 rhdr
= nfs_readhdr_alloc();
1570 desc
->pg_completion_ops
->error_cleanup(&desc
->pg_list
);
1572 pnfs_put_lseg(desc
->pg_lseg
);
1573 desc
->pg_lseg
= NULL
;
1576 hdr
= &rhdr
->header
;
1577 nfs_pgheader_init(desc
, hdr
, pnfs_readhdr_free
);
1578 hdr
->lseg
= pnfs_get_lseg(desc
->pg_lseg
);
1579 atomic_inc(&hdr
->refcnt
);
1580 ret
= nfs_generic_pagein(desc
, hdr
);
1582 pnfs_put_lseg(desc
->pg_lseg
);
1583 desc
->pg_lseg
= NULL
;
1585 pnfs_do_multiple_reads(desc
, &hdr
->rpc_list
);
1586 if (atomic_dec_and_test(&hdr
->refcnt
))
1587 hdr
->completion_ops
->completion(hdr
);
1590 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages
);
1593 * There can be multiple RW segments.
1595 static void pnfs_list_write_lseg(struct inode
*inode
, struct list_head
*listp
)
1597 struct pnfs_layout_segment
*lseg
;
1599 list_for_each_entry(lseg
, &NFS_I(inode
)->layout
->plh_segs
, pls_list
) {
1600 if (lseg
->pls_range
.iomode
== IOMODE_RW
&&
1601 test_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
))
1602 list_add(&lseg
->pls_lc_list
, listp
);
1606 void pnfs_set_lo_fail(struct pnfs_layout_segment
*lseg
)
1608 pnfs_layout_io_set_failed(lseg
->pls_layout
, lseg
->pls_range
.iomode
);
1610 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail
);
1613 pnfs_set_layoutcommit(struct nfs_write_data
*wdata
)
1615 struct nfs_pgio_header
*hdr
= wdata
->header
;
1616 struct inode
*inode
= hdr
->inode
;
1617 struct nfs_inode
*nfsi
= NFS_I(inode
);
1618 loff_t end_pos
= wdata
->mds_offset
+ wdata
->res
.count
;
1619 bool mark_as_dirty
= false;
1621 spin_lock(&inode
->i_lock
);
1622 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
)) {
1623 mark_as_dirty
= true;
1624 dprintk("%s: Set layoutcommit for inode %lu ",
1625 __func__
, inode
->i_ino
);
1627 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT
, &hdr
->lseg
->pls_flags
)) {
1628 /* references matched in nfs4_layoutcommit_release */
1629 pnfs_get_lseg(hdr
->lseg
);
1631 if (end_pos
> nfsi
->layout
->plh_lwb
)
1632 nfsi
->layout
->plh_lwb
= end_pos
;
1633 spin_unlock(&inode
->i_lock
);
1634 dprintk("%s: lseg %p end_pos %llu\n",
1635 __func__
, hdr
->lseg
, nfsi
->layout
->plh_lwb
);
1637 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
1638 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
1640 mark_inode_dirty_sync(inode
);
1642 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit
);
1644 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data
*data
)
1646 struct nfs_server
*nfss
= NFS_SERVER(data
->args
.inode
);
1648 if (nfss
->pnfs_curr_ld
->cleanup_layoutcommit
)
1649 nfss
->pnfs_curr_ld
->cleanup_layoutcommit(data
);
1653 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
1654 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
1655 * data to disk to allow the server to recover the data if it crashes.
1656 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
1657 * is off, and a COMMIT is sent to a data server, or
1658 * if WRITEs to a data server return NFS_DATA_SYNC.
1661 pnfs_layoutcommit_inode(struct inode
*inode
, bool sync
)
1663 struct nfs4_layoutcommit_data
*data
;
1664 struct nfs_inode
*nfsi
= NFS_I(inode
);
1668 dprintk("--> %s inode %lu\n", __func__
, inode
->i_ino
);
1670 if (!test_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
))
1673 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
1674 data
= kzalloc(sizeof(*data
), GFP_NOFS
);
1680 if (!test_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
))
1683 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING
, &nfsi
->flags
)) {
1688 status
= wait_on_bit_lock(&nfsi
->flags
, NFS_INO_LAYOUTCOMMITTING
,
1689 nfs_wait_bit_killable
, TASK_KILLABLE
);
1694 INIT_LIST_HEAD(&data
->lseg_list
);
1695 spin_lock(&inode
->i_lock
);
1696 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
)) {
1697 clear_bit(NFS_INO_LAYOUTCOMMITTING
, &nfsi
->flags
);
1698 spin_unlock(&inode
->i_lock
);
1699 wake_up_bit(&nfsi
->flags
, NFS_INO_LAYOUTCOMMITTING
);
1703 pnfs_list_write_lseg(inode
, &data
->lseg_list
);
1705 end_pos
= nfsi
->layout
->plh_lwb
;
1706 nfsi
->layout
->plh_lwb
= 0;
1708 nfs4_stateid_copy(&data
->args
.stateid
, &nfsi
->layout
->plh_stateid
);
1709 spin_unlock(&inode
->i_lock
);
1711 data
->args
.inode
= inode
;
1712 data
->cred
= get_rpccred(nfsi
->layout
->plh_lc_cred
);
1713 nfs_fattr_init(&data
->fattr
);
1714 data
->args
.bitmask
= NFS_SERVER(inode
)->cache_consistency_bitmask
;
1715 data
->res
.fattr
= &data
->fattr
;
1716 data
->args
.lastbytewritten
= end_pos
- 1;
1717 data
->res
.server
= NFS_SERVER(inode
);
1719 status
= nfs4_proc_layoutcommit(data
, sync
);
1722 mark_inode_dirty_sync(inode
);
1723 dprintk("<-- %s status %d\n", __func__
, status
);
1730 struct nfs4_threshold
*pnfs_mdsthreshold_alloc(void)
1732 struct nfs4_threshold
*thp
;
1734 thp
= kzalloc(sizeof(*thp
), GFP_NOFS
);
1736 dprintk("%s mdsthreshold allocation failed\n", __func__
);