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>
33 #include <linux/sort.h>
37 #include "nfs4trace.h"
38 #include "delegation.h"
41 #define NFSDBG_FACILITY NFSDBG_PNFS
42 #define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
47 * protects pnfs_modules_tbl.
49 static DEFINE_SPINLOCK(pnfs_spinlock
);
52 * pnfs_modules_tbl holds all pnfs modules
54 static LIST_HEAD(pnfs_modules_tbl
);
56 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr
*lo
);
57 static void pnfs_free_returned_lsegs(struct pnfs_layout_hdr
*lo
,
58 struct list_head
*free_me
,
59 const struct pnfs_layout_range
*range
,
61 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment
*lseg
,
62 struct list_head
*tmp_list
);
64 /* Return the registered pnfs layout driver module matching given id */
65 static struct pnfs_layoutdriver_type
*
66 find_pnfs_driver_locked(u32 id
)
68 struct pnfs_layoutdriver_type
*local
;
70 list_for_each_entry(local
, &pnfs_modules_tbl
, pnfs_tblid
)
75 dprintk("%s: Searching for id %u, found %p\n", __func__
, id
, local
);
79 static struct pnfs_layoutdriver_type
*
80 find_pnfs_driver(u32 id
)
82 struct pnfs_layoutdriver_type
*local
;
84 spin_lock(&pnfs_spinlock
);
85 local
= find_pnfs_driver_locked(id
);
86 if (local
!= NULL
&& !try_module_get(local
->owner
)) {
87 dprintk("%s: Could not grab reference on module\n", __func__
);
90 spin_unlock(&pnfs_spinlock
);
95 unset_pnfs_layoutdriver(struct nfs_server
*nfss
)
97 if (nfss
->pnfs_curr_ld
) {
98 if (nfss
->pnfs_curr_ld
->clear_layoutdriver
)
99 nfss
->pnfs_curr_ld
->clear_layoutdriver(nfss
);
100 /* Decrement the MDS count. Purge the deviceid cache if zero */
101 if (atomic_dec_and_test(&nfss
->nfs_client
->cl_mds_count
))
102 nfs4_deviceid_purge_client(nfss
->nfs_client
);
103 module_put(nfss
->pnfs_curr_ld
->owner
);
105 nfss
->pnfs_curr_ld
= NULL
;
109 * When the server sends a list of layout types, we choose one in the order
110 * given in the list below.
112 * FIXME: should this list be configurable in some fashion? module param?
113 * mount option? something else?
115 static const u32 ld_prefs
[] = {
120 LAYOUT_NFSV4_1_FILES
,
125 ld_cmp(const void *e1
, const void *e2
)
127 u32 ld1
= *((u32
*)e1
);
128 u32 ld2
= *((u32
*)e2
);
131 for (i
= 0; ld_prefs
[i
] != 0; i
++) {
132 if (ld1
== ld_prefs
[i
])
135 if (ld2
== ld_prefs
[i
])
142 * Try to set the server's pnfs module to the pnfs layout type specified by id.
143 * Currently only one pNFS layout driver per filesystem is supported.
145 * @ids array of layout types supported by MDS.
148 set_pnfs_layoutdriver(struct nfs_server
*server
, const struct nfs_fh
*mntfh
,
149 struct nfs_fsinfo
*fsinfo
)
151 struct pnfs_layoutdriver_type
*ld_type
= NULL
;
155 if (fsinfo
->nlayouttypes
== 0)
157 if (!(server
->nfs_client
->cl_exchange_flags
&
158 (EXCHGID4_FLAG_USE_NON_PNFS
| EXCHGID4_FLAG_USE_PNFS_MDS
))) {
159 printk(KERN_ERR
"NFS: %s: cl_exchange_flags 0x%x\n",
160 __func__
, server
->nfs_client
->cl_exchange_flags
);
164 sort(fsinfo
->layouttype
, fsinfo
->nlayouttypes
,
165 sizeof(*fsinfo
->layouttype
), ld_cmp
, NULL
);
167 for (i
= 0; i
< fsinfo
->nlayouttypes
; i
++) {
168 id
= fsinfo
->layouttype
[i
];
169 ld_type
= find_pnfs_driver(id
);
171 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX
,
173 ld_type
= find_pnfs_driver(id
);
180 dprintk("%s: No pNFS module found!\n", __func__
);
184 server
->pnfs_curr_ld
= ld_type
;
185 if (ld_type
->set_layoutdriver
186 && ld_type
->set_layoutdriver(server
, mntfh
)) {
187 printk(KERN_ERR
"NFS: %s: Error initializing pNFS layout "
188 "driver %u.\n", __func__
, id
);
189 module_put(ld_type
->owner
);
192 /* Bump the MDS count */
193 atomic_inc(&server
->nfs_client
->cl_mds_count
);
195 dprintk("%s: pNFS module for %u set\n", __func__
, id
);
199 dprintk("%s: Using NFSv4 I/O\n", __func__
);
200 server
->pnfs_curr_ld
= NULL
;
204 pnfs_register_layoutdriver(struct pnfs_layoutdriver_type
*ld_type
)
206 int status
= -EINVAL
;
207 struct pnfs_layoutdriver_type
*tmp
;
209 if (ld_type
->id
== 0) {
210 printk(KERN_ERR
"NFS: %s id 0 is reserved\n", __func__
);
213 if (!ld_type
->alloc_lseg
|| !ld_type
->free_lseg
) {
214 printk(KERN_ERR
"NFS: %s Layout driver must provide "
215 "alloc_lseg and free_lseg.\n", __func__
);
219 spin_lock(&pnfs_spinlock
);
220 tmp
= find_pnfs_driver_locked(ld_type
->id
);
222 list_add(&ld_type
->pnfs_tblid
, &pnfs_modules_tbl
);
224 dprintk("%s Registering id:%u name:%s\n", __func__
, ld_type
->id
,
227 printk(KERN_ERR
"NFS: %s Module with id %d already loaded!\n",
228 __func__
, ld_type
->id
);
230 spin_unlock(&pnfs_spinlock
);
234 EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver
);
237 pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type
*ld_type
)
239 dprintk("%s Deregistering id:%u\n", __func__
, ld_type
->id
);
240 spin_lock(&pnfs_spinlock
);
241 list_del(&ld_type
->pnfs_tblid
);
242 spin_unlock(&pnfs_spinlock
);
244 EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver
);
247 * pNFS client layout cache
250 /* Need to hold i_lock if caller does not already hold reference */
252 pnfs_get_layout_hdr(struct pnfs_layout_hdr
*lo
)
254 atomic_inc(&lo
->plh_refcount
);
257 static struct pnfs_layout_hdr
*
258 pnfs_alloc_layout_hdr(struct inode
*ino
, gfp_t gfp_flags
)
260 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(ino
)->pnfs_curr_ld
;
261 return ld
->alloc_layout_hdr(ino
, gfp_flags
);
265 pnfs_free_layout_hdr(struct pnfs_layout_hdr
*lo
)
267 struct nfs_server
*server
= NFS_SERVER(lo
->plh_inode
);
268 struct pnfs_layoutdriver_type
*ld
= server
->pnfs_curr_ld
;
270 if (!list_empty(&lo
->plh_layouts
)) {
271 struct nfs_client
*clp
= server
->nfs_client
;
273 spin_lock(&clp
->cl_lock
);
274 list_del_init(&lo
->plh_layouts
);
275 spin_unlock(&clp
->cl_lock
);
277 put_rpccred(lo
->plh_lc_cred
);
278 return ld
->free_layout_hdr(lo
);
282 pnfs_detach_layout_hdr(struct pnfs_layout_hdr
*lo
)
284 struct nfs_inode
*nfsi
= NFS_I(lo
->plh_inode
);
285 dprintk("%s: freeing layout cache %p\n", __func__
, lo
);
287 /* Reset MDS Threshold I/O counters */
293 pnfs_put_layout_hdr(struct pnfs_layout_hdr
*lo
)
295 struct inode
*inode
= lo
->plh_inode
;
297 pnfs_layoutreturn_before_put_layout_hdr(lo
);
299 if (atomic_dec_and_lock(&lo
->plh_refcount
, &inode
->i_lock
)) {
300 if (!list_empty(&lo
->plh_segs
))
301 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
302 pnfs_detach_layout_hdr(lo
);
303 spin_unlock(&inode
->i_lock
);
304 pnfs_free_layout_hdr(lo
);
309 pnfs_set_plh_return_info(struct pnfs_layout_hdr
*lo
, enum pnfs_iomode iomode
,
312 if (lo
->plh_return_iomode
!= 0 && lo
->plh_return_iomode
!= iomode
)
314 lo
->plh_return_iomode
= iomode
;
315 set_bit(NFS_LAYOUT_RETURN_REQUESTED
, &lo
->plh_flags
);
317 WARN_ON_ONCE(lo
->plh_return_seq
!= 0 && lo
->plh_return_seq
!= seq
);
318 lo
->plh_return_seq
= seq
;
323 pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr
*lo
)
325 struct pnfs_layout_segment
*lseg
;
326 lo
->plh_return_iomode
= 0;
327 lo
->plh_return_seq
= 0;
328 clear_bit(NFS_LAYOUT_RETURN_REQUESTED
, &lo
->plh_flags
);
329 list_for_each_entry(lseg
, &lo
->plh_segs
, pls_list
) {
330 if (!test_bit(NFS_LSEG_LAYOUTRETURN
, &lseg
->pls_flags
))
332 pnfs_set_plh_return_info(lo
, lseg
->pls_range
.iomode
, 0);
336 static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr
*lo
)
338 clear_bit_unlock(NFS_LAYOUT_RETURN
, &lo
->plh_flags
);
339 clear_bit(NFS_LAYOUT_RETURN_LOCK
, &lo
->plh_flags
);
340 smp_mb__after_atomic();
341 wake_up_bit(&lo
->plh_flags
, NFS_LAYOUT_RETURN
);
342 rpc_wake_up(&NFS_SERVER(lo
->plh_inode
)->roc_rpcwaitq
);
346 pnfs_clear_lseg_state(struct pnfs_layout_segment
*lseg
,
347 struct list_head
*free_me
)
349 clear_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
);
350 clear_bit(NFS_LSEG_LAYOUTRETURN
, &lseg
->pls_flags
);
351 if (test_and_clear_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
))
352 pnfs_lseg_dec_and_remove_zero(lseg
, free_me
);
353 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
))
354 pnfs_lseg_dec_and_remove_zero(lseg
, free_me
);
358 * Mark a pnfs_layout_hdr and all associated layout segments as invalid
360 * In order to continue using the pnfs_layout_hdr, a full recovery
362 * Note that caller must hold inode->i_lock.
365 pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr
*lo
,
366 struct list_head
*lseg_list
)
368 struct pnfs_layout_range range
= {
369 .iomode
= IOMODE_ANY
,
371 .length
= NFS4_MAX_UINT64
,
373 struct pnfs_layout_segment
*lseg
, *next
;
375 set_bit(NFS_LAYOUT_INVALID_STID
, &lo
->plh_flags
);
376 list_for_each_entry_safe(lseg
, next
, &lo
->plh_segs
, pls_list
)
377 pnfs_clear_lseg_state(lseg
, lseg_list
);
378 pnfs_clear_layoutreturn_info(lo
);
379 pnfs_free_returned_lsegs(lo
, lseg_list
, &range
, 0);
380 if (test_bit(NFS_LAYOUT_RETURN
, &lo
->plh_flags
) &&
381 !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK
, &lo
->plh_flags
))
382 pnfs_clear_layoutreturn_waitbit(lo
);
383 return !list_empty(&lo
->plh_segs
);
387 pnfs_iomode_to_fail_bit(u32 iomode
)
389 return iomode
== IOMODE_RW
?
390 NFS_LAYOUT_RW_FAILED
: NFS_LAYOUT_RO_FAILED
;
394 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr
*lo
, int fail_bit
)
396 lo
->plh_retry_timestamp
= jiffies
;
397 if (!test_and_set_bit(fail_bit
, &lo
->plh_flags
))
398 atomic_inc(&lo
->plh_refcount
);
402 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr
*lo
, int fail_bit
)
404 if (test_and_clear_bit(fail_bit
, &lo
->plh_flags
))
405 atomic_dec(&lo
->plh_refcount
);
409 pnfs_layout_io_set_failed(struct pnfs_layout_hdr
*lo
, u32 iomode
)
411 struct inode
*inode
= lo
->plh_inode
;
412 struct pnfs_layout_range range
= {
415 .length
= NFS4_MAX_UINT64
,
419 spin_lock(&inode
->i_lock
);
420 pnfs_layout_set_fail_bit(lo
, pnfs_iomode_to_fail_bit(iomode
));
421 pnfs_mark_matching_lsegs_invalid(lo
, &head
, &range
, 0);
422 spin_unlock(&inode
->i_lock
);
423 pnfs_free_lseg_list(&head
);
424 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__
,
425 iomode
== IOMODE_RW
? "RW" : "READ");
429 pnfs_layout_io_test_failed(struct pnfs_layout_hdr
*lo
, u32 iomode
)
431 unsigned long start
, end
;
432 int fail_bit
= pnfs_iomode_to_fail_bit(iomode
);
434 if (test_bit(fail_bit
, &lo
->plh_flags
) == 0)
437 start
= end
- PNFS_LAYOUTGET_RETRY_TIMEOUT
;
438 if (!time_in_range(lo
->plh_retry_timestamp
, start
, end
)) {
439 /* It is time to retry the failed layoutgets */
440 pnfs_layout_clear_fail_bit(lo
, fail_bit
);
447 pnfs_init_lseg(struct pnfs_layout_hdr
*lo
, struct pnfs_layout_segment
*lseg
,
448 const struct pnfs_layout_range
*range
,
449 const nfs4_stateid
*stateid
)
451 INIT_LIST_HEAD(&lseg
->pls_list
);
452 INIT_LIST_HEAD(&lseg
->pls_lc_list
);
453 atomic_set(&lseg
->pls_refcount
, 1);
454 set_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
);
455 lseg
->pls_layout
= lo
;
456 lseg
->pls_range
= *range
;
457 lseg
->pls_seq
= be32_to_cpu(stateid
->seqid
);
460 static void pnfs_free_lseg(struct pnfs_layout_segment
*lseg
)
463 struct inode
*inode
= lseg
->pls_layout
->plh_inode
;
464 NFS_SERVER(inode
)->pnfs_curr_ld
->free_lseg(lseg
);
469 pnfs_layout_remove_lseg(struct pnfs_layout_hdr
*lo
,
470 struct pnfs_layout_segment
*lseg
)
472 WARN_ON(test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
));
473 list_del_init(&lseg
->pls_list
);
474 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
475 atomic_dec(&lo
->plh_refcount
);
476 if (test_bit(NFS_LSEG_LAYOUTRETURN
, &lseg
->pls_flags
))
478 if (list_empty(&lo
->plh_segs
) &&
479 !test_bit(NFS_LAYOUT_RETURN_REQUESTED
, &lo
->plh_flags
) &&
480 !test_bit(NFS_LAYOUT_RETURN
, &lo
->plh_flags
)) {
481 if (atomic_read(&lo
->plh_outstanding
) == 0)
482 set_bit(NFS_LAYOUT_INVALID_STID
, &lo
->plh_flags
);
483 clear_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
);
488 pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr
*lo
,
489 struct pnfs_layout_segment
*lseg
)
491 if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN
, &lseg
->pls_flags
) &&
492 pnfs_layout_is_valid(lo
)) {
493 pnfs_set_plh_return_info(lo
, lseg
->pls_range
.iomode
, 0);
494 list_move_tail(&lseg
->pls_list
, &lo
->plh_return_segs
);
501 pnfs_put_lseg(struct pnfs_layout_segment
*lseg
)
503 struct pnfs_layout_hdr
*lo
;
509 dprintk("%s: lseg %p ref %d valid %d\n", __func__
, lseg
,
510 atomic_read(&lseg
->pls_refcount
),
511 test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
));
513 lo
= lseg
->pls_layout
;
514 inode
= lo
->plh_inode
;
516 if (atomic_dec_and_lock(&lseg
->pls_refcount
, &inode
->i_lock
)) {
517 if (test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
)) {
518 spin_unlock(&inode
->i_lock
);
521 pnfs_get_layout_hdr(lo
);
522 pnfs_layout_remove_lseg(lo
, lseg
);
523 if (pnfs_cache_lseg_for_layoutreturn(lo
, lseg
))
525 spin_unlock(&inode
->i_lock
);
526 pnfs_free_lseg(lseg
);
527 pnfs_put_layout_hdr(lo
);
530 EXPORT_SYMBOL_GPL(pnfs_put_lseg
);
533 * is l2 fully contained in l1?
535 * [----------------------------------)
540 pnfs_lseg_range_contained(const struct pnfs_layout_range
*l1
,
541 const struct pnfs_layout_range
*l2
)
543 u64 start1
= l1
->offset
;
544 u64 end1
= pnfs_end_offset(start1
, l1
->length
);
545 u64 start2
= l2
->offset
;
546 u64 end2
= pnfs_end_offset(start2
, l2
->length
);
548 return (start1
<= start2
) && (end1
>= end2
);
551 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment
*lseg
,
552 struct list_head
*tmp_list
)
554 if (!atomic_dec_and_test(&lseg
->pls_refcount
))
556 pnfs_layout_remove_lseg(lseg
->pls_layout
, lseg
);
557 list_add(&lseg
->pls_list
, tmp_list
);
561 /* Returns 1 if lseg is removed from list, 0 otherwise */
562 static int mark_lseg_invalid(struct pnfs_layout_segment
*lseg
,
563 struct list_head
*tmp_list
)
567 if (test_and_clear_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
)) {
568 /* Remove the reference keeping the lseg in the
569 * list. It will now be removed when all
570 * outstanding io is finished.
572 dprintk("%s: lseg %p ref %d\n", __func__
, lseg
,
573 atomic_read(&lseg
->pls_refcount
));
574 if (pnfs_lseg_dec_and_remove_zero(lseg
, tmp_list
))
581 * Compare 2 layout stateid sequence ids, to see which is newer,
582 * taking into account wraparound issues.
584 static bool pnfs_seqid_is_newer(u32 s1
, u32 s2
)
586 return (s32
)(s1
- s2
) > 0;
590 pnfs_should_free_range(const struct pnfs_layout_range
*lseg_range
,
591 const struct pnfs_layout_range
*recall_range
)
593 return (recall_range
->iomode
== IOMODE_ANY
||
594 lseg_range
->iomode
== recall_range
->iomode
) &&
595 pnfs_lseg_range_intersecting(lseg_range
, recall_range
);
599 pnfs_match_lseg_recall(const struct pnfs_layout_segment
*lseg
,
600 const struct pnfs_layout_range
*recall_range
,
603 if (seq
!= 0 && pnfs_seqid_is_newer(lseg
->pls_seq
, seq
))
605 if (recall_range
== NULL
)
607 return pnfs_should_free_range(&lseg
->pls_range
, recall_range
);
611 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later
612 * @lo: layout header containing the lsegs
613 * @tmp_list: list head where doomed lsegs should go
614 * @recall_range: optional recall range argument to match (may be NULL)
615 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0)
617 * Walk the list of lsegs in the layout header, and tear down any that should
618 * be destroyed. If "recall_range" is specified then the segment must match
619 * that range. If "seq" is non-zero, then only match segments that were handed
620 * out at or before that sequence.
622 * Returns number of matching invalid lsegs remaining in list after scanning
623 * it and purging them.
626 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr
*lo
,
627 struct list_head
*tmp_list
,
628 const struct pnfs_layout_range
*recall_range
,
631 struct pnfs_layout_segment
*lseg
, *next
;
634 dprintk("%s:Begin lo %p\n", __func__
, lo
);
636 if (list_empty(&lo
->plh_segs
))
638 list_for_each_entry_safe(lseg
, next
, &lo
->plh_segs
, pls_list
)
639 if (pnfs_match_lseg_recall(lseg
, recall_range
, seq
)) {
640 dprintk("%s: freeing lseg %p iomode %d seq %u"
641 "offset %llu length %llu\n", __func__
,
642 lseg
, lseg
->pls_range
.iomode
, lseg
->pls_seq
,
643 lseg
->pls_range
.offset
, lseg
->pls_range
.length
);
644 if (!mark_lseg_invalid(lseg
, tmp_list
))
647 dprintk("%s:Return %i\n", __func__
, remaining
);
652 pnfs_free_returned_lsegs(struct pnfs_layout_hdr
*lo
,
653 struct list_head
*free_me
,
654 const struct pnfs_layout_range
*range
,
657 struct pnfs_layout_segment
*lseg
, *next
;
659 list_for_each_entry_safe(lseg
, next
, &lo
->plh_return_segs
, pls_list
) {
660 if (pnfs_match_lseg_recall(lseg
, range
, seq
))
661 list_move_tail(&lseg
->pls_list
, free_me
);
665 /* note free_me must contain lsegs from a single layout_hdr */
667 pnfs_free_lseg_list(struct list_head
*free_me
)
669 struct pnfs_layout_segment
*lseg
, *tmp
;
671 if (list_empty(free_me
))
674 list_for_each_entry_safe(lseg
, tmp
, free_me
, pls_list
) {
675 list_del(&lseg
->pls_list
);
676 pnfs_free_lseg(lseg
);
681 pnfs_destroy_layout(struct nfs_inode
*nfsi
)
683 struct pnfs_layout_hdr
*lo
;
686 spin_lock(&nfsi
->vfs_inode
.i_lock
);
689 pnfs_get_layout_hdr(lo
);
690 pnfs_mark_layout_stateid_invalid(lo
, &tmp_list
);
691 pnfs_layout_clear_fail_bit(lo
, NFS_LAYOUT_RO_FAILED
);
692 pnfs_layout_clear_fail_bit(lo
, NFS_LAYOUT_RW_FAILED
);
693 spin_unlock(&nfsi
->vfs_inode
.i_lock
);
694 pnfs_free_lseg_list(&tmp_list
);
695 nfs_commit_inode(&nfsi
->vfs_inode
, 0);
696 pnfs_put_layout_hdr(lo
);
698 spin_unlock(&nfsi
->vfs_inode
.i_lock
);
700 EXPORT_SYMBOL_GPL(pnfs_destroy_layout
);
703 pnfs_layout_add_bulk_destroy_list(struct inode
*inode
,
704 struct list_head
*layout_list
)
706 struct pnfs_layout_hdr
*lo
;
709 spin_lock(&inode
->i_lock
);
710 lo
= NFS_I(inode
)->layout
;
711 if (lo
!= NULL
&& list_empty(&lo
->plh_bulk_destroy
)) {
712 pnfs_get_layout_hdr(lo
);
713 list_add(&lo
->plh_bulk_destroy
, layout_list
);
716 spin_unlock(&inode
->i_lock
);
720 /* Caller must hold rcu_read_lock and clp->cl_lock */
722 pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client
*clp
,
723 struct nfs_server
*server
,
724 struct list_head
*layout_list
)
726 struct pnfs_layout_hdr
*lo
, *next
;
729 list_for_each_entry_safe(lo
, next
, &server
->layouts
, plh_layouts
) {
730 if (test_bit(NFS_LAYOUT_INVALID_STID
, &lo
->plh_flags
))
732 inode
= igrab(lo
->plh_inode
);
735 list_del_init(&lo
->plh_layouts
);
736 if (pnfs_layout_add_bulk_destroy_list(inode
, layout_list
))
739 spin_unlock(&clp
->cl_lock
);
741 spin_lock(&clp
->cl_lock
);
749 pnfs_layout_free_bulk_destroy_list(struct list_head
*layout_list
,
752 struct pnfs_layout_hdr
*lo
;
754 LIST_HEAD(lseg_list
);
757 while (!list_empty(layout_list
)) {
758 lo
= list_entry(layout_list
->next
, struct pnfs_layout_hdr
,
760 dprintk("%s freeing layout for inode %lu\n", __func__
,
761 lo
->plh_inode
->i_ino
);
762 inode
= lo
->plh_inode
;
764 pnfs_layoutcommit_inode(inode
, false);
766 spin_lock(&inode
->i_lock
);
767 list_del_init(&lo
->plh_bulk_destroy
);
768 if (pnfs_mark_layout_stateid_invalid(lo
, &lseg_list
)) {
770 set_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
);
773 spin_unlock(&inode
->i_lock
);
774 pnfs_free_lseg_list(&lseg_list
);
775 /* Free all lsegs that are attached to commit buckets */
776 nfs_commit_inode(inode
, 0);
777 pnfs_put_layout_hdr(lo
);
784 pnfs_destroy_layouts_byfsid(struct nfs_client
*clp
,
785 struct nfs_fsid
*fsid
,
788 struct nfs_server
*server
;
789 LIST_HEAD(layout_list
);
791 spin_lock(&clp
->cl_lock
);
794 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
795 if (memcmp(&server
->fsid
, fsid
, sizeof(*fsid
)) != 0)
797 if (pnfs_layout_bulk_destroy_byserver_locked(clp
,
803 spin_unlock(&clp
->cl_lock
);
805 if (list_empty(&layout_list
))
807 return pnfs_layout_free_bulk_destroy_list(&layout_list
, is_recall
);
811 pnfs_destroy_layouts_byclid(struct nfs_client
*clp
,
814 struct nfs_server
*server
;
815 LIST_HEAD(layout_list
);
817 spin_lock(&clp
->cl_lock
);
820 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
821 if (pnfs_layout_bulk_destroy_byserver_locked(clp
,
827 spin_unlock(&clp
->cl_lock
);
829 if (list_empty(&layout_list
))
831 return pnfs_layout_free_bulk_destroy_list(&layout_list
, is_recall
);
835 * Called by the state manger to remove all layouts established under an
839 pnfs_destroy_all_layouts(struct nfs_client
*clp
)
841 nfs4_deviceid_mark_client_invalid(clp
);
842 nfs4_deviceid_purge_client(clp
);
844 pnfs_destroy_layouts_byclid(clp
, false);
847 /* update lo->plh_stateid with new if is more recent */
849 pnfs_set_layout_stateid(struct pnfs_layout_hdr
*lo
, const nfs4_stateid
*new,
852 u32 oldseq
, newseq
, new_barrier
= 0;
854 oldseq
= be32_to_cpu(lo
->plh_stateid
.seqid
);
855 newseq
= be32_to_cpu(new->seqid
);
857 if (!pnfs_layout_is_valid(lo
)) {
858 nfs4_stateid_copy(&lo
->plh_stateid
, new);
859 lo
->plh_barrier
= newseq
;
860 pnfs_clear_layoutreturn_info(lo
);
861 clear_bit(NFS_LAYOUT_INVALID_STID
, &lo
->plh_flags
);
864 if (pnfs_seqid_is_newer(newseq
, oldseq
)) {
865 nfs4_stateid_copy(&lo
->plh_stateid
, new);
867 * Because of wraparound, we want to keep the barrier
868 * "close" to the current seqids.
870 new_barrier
= newseq
- atomic_read(&lo
->plh_outstanding
);
873 new_barrier
= be32_to_cpu(new->seqid
);
874 else if (new_barrier
== 0)
876 if (pnfs_seqid_is_newer(new_barrier
, lo
->plh_barrier
))
877 lo
->plh_barrier
= new_barrier
;
881 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr
*lo
,
882 const nfs4_stateid
*stateid
)
884 u32 seqid
= be32_to_cpu(stateid
->seqid
);
886 return !pnfs_seqid_is_newer(seqid
, lo
->plh_barrier
);
889 /* lget is set to 1 if called from inside send_layoutget call chain */
891 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr
*lo
)
893 return lo
->plh_block_lgets
||
894 test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
);
898 * Get layout from server.
899 * for now, assume that whole file layouts are requested.
901 * arg->length: all ones
903 static struct pnfs_layout_segment
*
904 send_layoutget(struct pnfs_layout_hdr
*lo
,
905 struct nfs_open_context
*ctx
,
906 nfs4_stateid
*stateid
,
907 const struct pnfs_layout_range
*range
,
908 long *timeout
, gfp_t gfp_flags
)
910 struct inode
*ino
= lo
->plh_inode
;
911 struct nfs_server
*server
= NFS_SERVER(ino
);
912 struct nfs4_layoutget
*lgp
;
915 dprintk("--> %s\n", __func__
);
918 * Synchronously retrieve layout information from server and
919 * store in lseg. If we race with a concurrent seqid morphing
920 * op, then re-send the LAYOUTGET.
922 lgp
= kzalloc(sizeof(*lgp
), gfp_flags
);
924 return ERR_PTR(-ENOMEM
);
926 i_size
= i_size_read(ino
);
928 lgp
->args
.minlength
= PAGE_SIZE
;
929 if (lgp
->args
.minlength
> range
->length
)
930 lgp
->args
.minlength
= range
->length
;
931 if (range
->iomode
== IOMODE_READ
) {
932 if (range
->offset
>= i_size
)
933 lgp
->args
.minlength
= 0;
934 else if (i_size
- range
->offset
< lgp
->args
.minlength
)
935 lgp
->args
.minlength
= i_size
- range
->offset
;
937 lgp
->args
.maxcount
= PNFS_LAYOUT_MAXSIZE
;
938 pnfs_copy_range(&lgp
->args
.range
, range
);
939 lgp
->args
.type
= server
->pnfs_curr_ld
->id
;
940 lgp
->args
.inode
= ino
;
941 lgp
->args
.ctx
= get_nfs_open_context(ctx
);
942 nfs4_stateid_copy(&lgp
->args
.stateid
, stateid
);
943 lgp
->gfp_flags
= gfp_flags
;
944 lgp
->cred
= lo
->plh_lc_cred
;
946 return nfs4_proc_layoutget(lgp
, timeout
, gfp_flags
);
949 static void pnfs_clear_layoutcommit(struct inode
*inode
,
950 struct list_head
*head
)
952 struct nfs_inode
*nfsi
= NFS_I(inode
);
953 struct pnfs_layout_segment
*lseg
, *tmp
;
955 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
))
957 list_for_each_entry_safe(lseg
, tmp
, &nfsi
->layout
->plh_segs
, pls_list
) {
958 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
))
960 pnfs_lseg_dec_and_remove_zero(lseg
, head
);
964 void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr
*lo
,
965 const nfs4_stateid
*arg_stateid
,
966 const struct pnfs_layout_range
*range
,
967 const nfs4_stateid
*stateid
)
969 struct inode
*inode
= lo
->plh_inode
;
972 spin_lock(&inode
->i_lock
);
973 if (!pnfs_layout_is_valid(lo
) || !arg_stateid
||
974 !nfs4_stateid_match_other(&lo
->plh_stateid
, arg_stateid
))
977 u32 seq
= be32_to_cpu(arg_stateid
->seqid
);
979 pnfs_mark_matching_lsegs_invalid(lo
, &freeme
, range
, seq
);
980 pnfs_free_returned_lsegs(lo
, &freeme
, range
, seq
);
981 pnfs_set_layout_stateid(lo
, stateid
, true);
983 pnfs_mark_layout_stateid_invalid(lo
, &freeme
);
985 pnfs_clear_layoutreturn_waitbit(lo
);
986 spin_unlock(&inode
->i_lock
);
987 pnfs_free_lseg_list(&freeme
);
992 pnfs_prepare_layoutreturn(struct pnfs_layout_hdr
*lo
,
993 nfs4_stateid
*stateid
,
994 enum pnfs_iomode
*iomode
)
996 /* Serialise LAYOUTGET/LAYOUTRETURN */
997 if (atomic_read(&lo
->plh_outstanding
) != 0)
999 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK
, &lo
->plh_flags
))
1001 set_bit(NFS_LAYOUT_RETURN
, &lo
->plh_flags
);
1002 pnfs_get_layout_hdr(lo
);
1003 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED
, &lo
->plh_flags
)) {
1004 if (stateid
!= NULL
) {
1005 nfs4_stateid_copy(stateid
, &lo
->plh_stateid
);
1006 if (lo
->plh_return_seq
!= 0)
1007 stateid
->seqid
= cpu_to_be32(lo
->plh_return_seq
);
1010 *iomode
= lo
->plh_return_iomode
;
1011 pnfs_clear_layoutreturn_info(lo
);
1014 if (stateid
!= NULL
)
1015 nfs4_stateid_copy(stateid
, &lo
->plh_stateid
);
1017 *iomode
= IOMODE_ANY
;
1022 pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args
*args
,
1023 struct pnfs_layout_hdr
*lo
,
1024 const nfs4_stateid
*stateid
,
1025 enum pnfs_iomode iomode
)
1027 struct inode
*inode
= lo
->plh_inode
;
1029 args
->layout_type
= NFS_SERVER(inode
)->pnfs_curr_ld
->id
;
1030 args
->inode
= inode
;
1031 args
->range
.iomode
= iomode
;
1032 args
->range
.offset
= 0;
1033 args
->range
.length
= NFS4_MAX_UINT64
;
1035 nfs4_stateid_copy(&args
->stateid
, stateid
);
1039 pnfs_send_layoutreturn(struct pnfs_layout_hdr
*lo
, const nfs4_stateid
*stateid
,
1040 enum pnfs_iomode iomode
, bool sync
)
1042 struct inode
*ino
= lo
->plh_inode
;
1043 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(ino
)->pnfs_curr_ld
;
1044 struct nfs4_layoutreturn
*lrp
;
1047 lrp
= kzalloc(sizeof(*lrp
), GFP_NOFS
);
1048 if (unlikely(lrp
== NULL
)) {
1050 spin_lock(&ino
->i_lock
);
1051 pnfs_clear_layoutreturn_waitbit(lo
);
1052 spin_unlock(&ino
->i_lock
);
1053 pnfs_put_layout_hdr(lo
);
1057 pnfs_init_layoutreturn_args(&lrp
->args
, lo
, stateid
, iomode
);
1058 lrp
->args
.ld_private
= &lrp
->ld_private
;
1059 lrp
->clp
= NFS_SERVER(ino
)->nfs_client
;
1060 lrp
->cred
= lo
->plh_lc_cred
;
1061 if (ld
->prepare_layoutreturn
)
1062 ld
->prepare_layoutreturn(&lrp
->args
);
1064 status
= nfs4_proc_layoutreturn(lrp
, sync
);
1066 dprintk("<-- %s status: %d\n", __func__
, status
);
1070 /* Return true if layoutreturn is needed */
1072 pnfs_layout_need_return(struct pnfs_layout_hdr
*lo
)
1074 struct pnfs_layout_segment
*s
;
1076 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED
, &lo
->plh_flags
))
1079 /* Defer layoutreturn until all lsegs are done */
1080 list_for_each_entry(s
, &lo
->plh_segs
, pls_list
) {
1081 if (test_bit(NFS_LSEG_LAYOUTRETURN
, &s
->pls_flags
))
1088 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr
*lo
)
1090 struct inode
*inode
= lo
->plh_inode
;
1092 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED
, &lo
->plh_flags
))
1094 spin_lock(&inode
->i_lock
);
1095 if (pnfs_layout_need_return(lo
)) {
1096 nfs4_stateid stateid
;
1097 enum pnfs_iomode iomode
;
1100 send
= pnfs_prepare_layoutreturn(lo
, &stateid
, &iomode
);
1101 spin_unlock(&inode
->i_lock
);
1103 /* Send an async layoutreturn so we dont deadlock */
1104 pnfs_send_layoutreturn(lo
, &stateid
, iomode
, false);
1107 spin_unlock(&inode
->i_lock
);
1111 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
1112 * when the layout segment list is empty.
1114 * Note that a pnfs_layout_hdr can exist with an empty layout segment
1115 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
1116 * deviceid is marked invalid.
1119 _pnfs_return_layout(struct inode
*ino
)
1121 struct pnfs_layout_hdr
*lo
= NULL
;
1122 struct nfs_inode
*nfsi
= NFS_I(ino
);
1123 LIST_HEAD(tmp_list
);
1124 nfs4_stateid stateid
;
1128 dprintk("NFS: %s for inode %lu\n", __func__
, ino
->i_ino
);
1130 spin_lock(&ino
->i_lock
);
1133 spin_unlock(&ino
->i_lock
);
1134 dprintk("NFS: %s no layout to return\n", __func__
);
1137 /* Reference matched in nfs4_layoutreturn_release */
1138 pnfs_get_layout_hdr(lo
);
1139 /* Is there an outstanding layoutreturn ? */
1140 if (test_bit(NFS_LAYOUT_RETURN_LOCK
, &lo
->plh_flags
)) {
1141 spin_unlock(&ino
->i_lock
);
1142 if (wait_on_bit(&lo
->plh_flags
, NFS_LAYOUT_RETURN
,
1143 TASK_UNINTERRUPTIBLE
))
1144 goto out_put_layout_hdr
;
1145 spin_lock(&ino
->i_lock
);
1147 pnfs_clear_layoutcommit(ino
, &tmp_list
);
1148 pnfs_mark_matching_lsegs_invalid(lo
, &tmp_list
, NULL
, 0);
1150 if (NFS_SERVER(ino
)->pnfs_curr_ld
->return_range
) {
1151 struct pnfs_layout_range range
= {
1152 .iomode
= IOMODE_ANY
,
1154 .length
= NFS4_MAX_UINT64
,
1156 NFS_SERVER(ino
)->pnfs_curr_ld
->return_range(lo
, &range
);
1159 /* Don't send a LAYOUTRETURN if list was initially empty */
1160 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED
, &lo
->plh_flags
)) {
1161 spin_unlock(&ino
->i_lock
);
1162 dprintk("NFS: %s no layout segments to return\n", __func__
);
1163 goto out_put_layout_hdr
;
1166 send
= pnfs_prepare_layoutreturn(lo
, &stateid
, NULL
);
1167 spin_unlock(&ino
->i_lock
);
1169 status
= pnfs_send_layoutreturn(lo
, &stateid
, IOMODE_ANY
, true);
1171 pnfs_free_lseg_list(&tmp_list
);
1172 pnfs_put_layout_hdr(lo
);
1174 dprintk("<-- %s status: %d\n", __func__
, status
);
1179 pnfs_commit_and_return_layout(struct inode
*inode
)
1181 struct pnfs_layout_hdr
*lo
;
1184 spin_lock(&inode
->i_lock
);
1185 lo
= NFS_I(inode
)->layout
;
1187 spin_unlock(&inode
->i_lock
);
1190 pnfs_get_layout_hdr(lo
);
1191 /* Block new layoutgets and read/write to ds */
1192 lo
->plh_block_lgets
++;
1193 spin_unlock(&inode
->i_lock
);
1194 filemap_fdatawait(inode
->i_mapping
);
1195 ret
= pnfs_layoutcommit_inode(inode
, true);
1197 ret
= _pnfs_return_layout(inode
);
1198 spin_lock(&inode
->i_lock
);
1199 lo
->plh_block_lgets
--;
1200 spin_unlock(&inode
->i_lock
);
1201 pnfs_put_layout_hdr(lo
);
1205 bool pnfs_roc(struct inode
*ino
,
1206 struct nfs4_layoutreturn_args
*args
,
1207 struct nfs4_layoutreturn_res
*res
,
1208 const struct rpc_cred
*cred
)
1210 struct nfs_inode
*nfsi
= NFS_I(ino
);
1211 struct nfs_open_context
*ctx
;
1212 struct nfs4_state
*state
;
1213 struct pnfs_layout_hdr
*lo
;
1214 struct pnfs_layout_segment
*lseg
, *next
;
1215 nfs4_stateid stateid
;
1216 enum pnfs_iomode iomode
= 0;
1217 bool layoutreturn
= false, roc
= false;
1218 bool skip_read
= false;
1220 if (!nfs_have_layout(ino
))
1223 spin_lock(&ino
->i_lock
);
1225 if (!lo
|| !pnfs_layout_is_valid(lo
) ||
1226 test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
))
1228 if (test_bit(NFS_LAYOUT_RETURN_LOCK
, &lo
->plh_flags
)) {
1229 pnfs_get_layout_hdr(lo
);
1230 spin_unlock(&ino
->i_lock
);
1231 wait_on_bit(&lo
->plh_flags
, NFS_LAYOUT_RETURN
,
1232 TASK_UNINTERRUPTIBLE
);
1233 pnfs_put_layout_hdr(lo
);
1237 /* no roc if we hold a delegation */
1238 if (nfs4_check_delegation(ino
, FMODE_READ
)) {
1239 if (nfs4_check_delegation(ino
, FMODE_WRITE
))
1244 list_for_each_entry(ctx
, &nfsi
->open_files
, list
) {
1248 /* Don't return layout if there is open file state */
1249 if (state
->state
& FMODE_WRITE
)
1251 if (state
->state
& FMODE_READ
)
1256 list_for_each_entry_safe(lseg
, next
, &lo
->plh_segs
, pls_list
) {
1257 if (skip_read
&& lseg
->pls_range
.iomode
== IOMODE_READ
)
1259 /* If we are sending layoutreturn, invalidate all valid lsegs */
1260 if (!test_and_clear_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
))
1263 * Note: mark lseg for return so pnfs_layout_remove_lseg
1264 * doesn't invalidate the layout for us.
1266 set_bit(NFS_LSEG_LAYOUTRETURN
, &lseg
->pls_flags
);
1267 if (!mark_lseg_invalid(lseg
, &lo
->plh_return_segs
))
1269 pnfs_set_plh_return_info(lo
, lseg
->pls_range
.iomode
, 0);
1272 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED
, &lo
->plh_flags
))
1275 /* ROC in two conditions:
1276 * 1. there are ROC lsegs
1277 * 2. we don't send layoutreturn
1279 /* lo ref dropped in pnfs_roc_release() */
1280 layoutreturn
= pnfs_prepare_layoutreturn(lo
, &stateid
, &iomode
);
1281 /* If the creds don't match, we can't compound the layoutreturn */
1282 if (!layoutreturn
|| cred
!= lo
->plh_lc_cred
)
1286 pnfs_init_layoutreturn_args(args
, lo
, &stateid
, iomode
);
1287 res
->lrs_present
= 0;
1288 layoutreturn
= false;
1291 spin_unlock(&ino
->i_lock
);
1292 pnfs_layoutcommit_inode(ino
, true);
1294 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(ino
)->pnfs_curr_ld
;
1295 if (ld
->prepare_layoutreturn
)
1296 ld
->prepare_layoutreturn(args
);
1300 pnfs_send_layoutreturn(lo
, &stateid
, iomode
, true);
1304 void pnfs_roc_release(struct nfs4_layoutreturn_args
*args
,
1305 struct nfs4_layoutreturn_res
*res
,
1308 struct pnfs_layout_hdr
*lo
= args
->layout
;
1309 const nfs4_stateid
*arg_stateid
= NULL
;
1310 const nfs4_stateid
*res_stateid
= NULL
;
1311 struct nfs4_xdr_opaque_data
*ld_private
= args
->ld_private
;
1314 arg_stateid
= &args
->stateid
;
1315 if (res
->lrs_present
)
1316 res_stateid
= &res
->stateid
;
1318 pnfs_layoutreturn_free_lsegs(lo
, arg_stateid
, &args
->range
,
1320 if (ld_private
&& ld_private
->ops
&& ld_private
->ops
->free
)
1321 ld_private
->ops
->free(ld_private
);
1322 pnfs_put_layout_hdr(lo
);
1323 trace_nfs4_layoutreturn_on_close(args
->inode
, 0);
1326 bool pnfs_wait_on_layoutreturn(struct inode
*ino
, struct rpc_task
*task
)
1328 struct nfs_inode
*nfsi
= NFS_I(ino
);
1329 struct pnfs_layout_hdr
*lo
;
1332 /* we might not have grabbed lo reference. so need to check under
1334 spin_lock(&ino
->i_lock
);
1336 if (lo
&& test_bit(NFS_LAYOUT_RETURN
, &lo
->plh_flags
)) {
1337 rpc_sleep_on(&NFS_SERVER(ino
)->roc_rpcwaitq
, task
, NULL
);
1340 spin_unlock(&ino
->i_lock
);
1345 * Compare two layout segments for sorting into layout cache.
1346 * We want to preferentially return RW over RO layouts, so ensure those
1350 pnfs_lseg_range_cmp(const struct pnfs_layout_range
*l1
,
1351 const struct pnfs_layout_range
*l2
)
1355 /* high offset > low offset */
1356 d
= l1
->offset
- l2
->offset
;
1360 /* short length > long length */
1361 d
= l2
->length
- l1
->length
;
1365 /* read > read/write */
1366 return (int)(l1
->iomode
== IOMODE_READ
) - (int)(l2
->iomode
== IOMODE_READ
);
1370 pnfs_lseg_range_is_after(const struct pnfs_layout_range
*l1
,
1371 const struct pnfs_layout_range
*l2
)
1373 return pnfs_lseg_range_cmp(l1
, l2
) > 0;
1377 pnfs_lseg_no_merge(struct pnfs_layout_segment
*lseg
,
1378 struct pnfs_layout_segment
*old
)
1384 pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr
*lo
,
1385 struct pnfs_layout_segment
*lseg
,
1386 bool (*is_after
)(const struct pnfs_layout_range
*,
1387 const struct pnfs_layout_range
*),
1388 bool (*do_merge
)(struct pnfs_layout_segment
*,
1389 struct pnfs_layout_segment
*),
1390 struct list_head
*free_me
)
1392 struct pnfs_layout_segment
*lp
, *tmp
;
1394 dprintk("%s:Begin\n", __func__
);
1396 list_for_each_entry_safe(lp
, tmp
, &lo
->plh_segs
, pls_list
) {
1397 if (test_bit(NFS_LSEG_VALID
, &lp
->pls_flags
) == 0)
1399 if (do_merge(lseg
, lp
)) {
1400 mark_lseg_invalid(lp
, free_me
);
1403 if (is_after(&lseg
->pls_range
, &lp
->pls_range
))
1405 list_add_tail(&lseg
->pls_list
, &lp
->pls_list
);
1406 dprintk("%s: inserted lseg %p "
1407 "iomode %d offset %llu length %llu before "
1408 "lp %p iomode %d offset %llu length %llu\n",
1409 __func__
, lseg
, lseg
->pls_range
.iomode
,
1410 lseg
->pls_range
.offset
, lseg
->pls_range
.length
,
1411 lp
, lp
->pls_range
.iomode
, lp
->pls_range
.offset
,
1412 lp
->pls_range
.length
);
1415 list_add_tail(&lseg
->pls_list
, &lo
->plh_segs
);
1416 dprintk("%s: inserted lseg %p "
1417 "iomode %d offset %llu length %llu at tail\n",
1418 __func__
, lseg
, lseg
->pls_range
.iomode
,
1419 lseg
->pls_range
.offset
, lseg
->pls_range
.length
);
1421 pnfs_get_layout_hdr(lo
);
1423 dprintk("%s:Return\n", __func__
);
1425 EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg
);
1428 pnfs_layout_insert_lseg(struct pnfs_layout_hdr
*lo
,
1429 struct pnfs_layout_segment
*lseg
,
1430 struct list_head
*free_me
)
1432 struct inode
*inode
= lo
->plh_inode
;
1433 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(inode
)->pnfs_curr_ld
;
1435 if (ld
->add_lseg
!= NULL
)
1436 ld
->add_lseg(lo
, lseg
, free_me
);
1438 pnfs_generic_layout_insert_lseg(lo
, lseg
,
1439 pnfs_lseg_range_is_after
,
1444 static struct pnfs_layout_hdr
*
1445 alloc_init_layout_hdr(struct inode
*ino
,
1446 struct nfs_open_context
*ctx
,
1449 struct pnfs_layout_hdr
*lo
;
1451 lo
= pnfs_alloc_layout_hdr(ino
, gfp_flags
);
1454 atomic_set(&lo
->plh_refcount
, 1);
1455 INIT_LIST_HEAD(&lo
->plh_layouts
);
1456 INIT_LIST_HEAD(&lo
->plh_segs
);
1457 INIT_LIST_HEAD(&lo
->plh_return_segs
);
1458 INIT_LIST_HEAD(&lo
->plh_bulk_destroy
);
1459 lo
->plh_inode
= ino
;
1460 lo
->plh_lc_cred
= get_rpccred(ctx
->cred
);
1461 lo
->plh_flags
|= 1 << NFS_LAYOUT_INVALID_STID
;
1465 static struct pnfs_layout_hdr
*
1466 pnfs_find_alloc_layout(struct inode
*ino
,
1467 struct nfs_open_context
*ctx
,
1469 __releases(&ino
->i_lock
)
1470 __acquires(&ino
->i_lock
)
1472 struct nfs_inode
*nfsi
= NFS_I(ino
);
1473 struct pnfs_layout_hdr
*new = NULL
;
1475 dprintk("%s Begin ino=%p layout=%p\n", __func__
, ino
, nfsi
->layout
);
1477 if (nfsi
->layout
!= NULL
)
1479 spin_unlock(&ino
->i_lock
);
1480 new = alloc_init_layout_hdr(ino
, ctx
, gfp_flags
);
1481 spin_lock(&ino
->i_lock
);
1483 if (likely(nfsi
->layout
== NULL
)) { /* Won the race? */
1486 } else if (new != NULL
)
1487 pnfs_free_layout_hdr(new);
1489 pnfs_get_layout_hdr(nfsi
->layout
);
1490 return nfsi
->layout
;
1494 * iomode matching rules:
1495 * iomode lseg strict match
1497 * ----- ----- ------ -----
1502 * READ READ N/A true
1503 * READ RW true false
1504 * READ RW false true
1507 pnfs_lseg_range_match(const struct pnfs_layout_range
*ls_range
,
1508 const struct pnfs_layout_range
*range
,
1511 struct pnfs_layout_range range1
;
1513 if ((range
->iomode
== IOMODE_RW
&&
1514 ls_range
->iomode
!= IOMODE_RW
) ||
1515 (range
->iomode
!= ls_range
->iomode
&&
1516 strict_iomode
== true) ||
1517 !pnfs_lseg_range_intersecting(ls_range
, range
))
1520 /* range1 covers only the first byte in the range */
1523 return pnfs_lseg_range_contained(ls_range
, &range1
);
1527 * lookup range in layout
1529 static struct pnfs_layout_segment
*
1530 pnfs_find_lseg(struct pnfs_layout_hdr
*lo
,
1531 struct pnfs_layout_range
*range
,
1534 struct pnfs_layout_segment
*lseg
, *ret
= NULL
;
1536 dprintk("%s:Begin\n", __func__
);
1538 list_for_each_entry(lseg
, &lo
->plh_segs
, pls_list
) {
1539 if (test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
) &&
1540 !test_bit(NFS_LSEG_LAYOUTRETURN
, &lseg
->pls_flags
) &&
1541 pnfs_lseg_range_match(&lseg
->pls_range
, range
,
1543 ret
= pnfs_get_lseg(lseg
);
1548 dprintk("%s:Return lseg %p ref %d\n",
1549 __func__
, ret
, ret
? atomic_read(&ret
->pls_refcount
) : 0);
1554 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1555 * to the MDS or over pNFS
1557 * The nfs_inode read_io and write_io fields are cumulative counters reset
1558 * when there are no layout segments. Note that in pnfs_update_layout iomode
1559 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1562 * A return of true means use MDS I/O.
1565 * If a file's size is smaller than the file size threshold, data accesses
1566 * SHOULD be sent to the metadata server. If an I/O request has a length that
1567 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1568 * server. If both file size and I/O size are provided, the client SHOULD
1569 * reach or exceed both thresholds before sending its read or write
1570 * requests to the data server.
1572 static bool pnfs_within_mdsthreshold(struct nfs_open_context
*ctx
,
1573 struct inode
*ino
, int iomode
)
1575 struct nfs4_threshold
*t
= ctx
->mdsthreshold
;
1576 struct nfs_inode
*nfsi
= NFS_I(ino
);
1577 loff_t fsize
= i_size_read(ino
);
1578 bool size
= false, size_set
= false, io
= false, io_set
= false, ret
= false;
1583 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1584 __func__
, t
->bm
, t
->rd_sz
, t
->wr_sz
, t
->rd_io_sz
, t
->wr_io_sz
);
1588 if (t
->bm
& THRESHOLD_RD
) {
1589 dprintk("%s fsize %llu\n", __func__
, fsize
);
1591 if (fsize
< t
->rd_sz
)
1594 if (t
->bm
& THRESHOLD_RD_IO
) {
1595 dprintk("%s nfsi->read_io %llu\n", __func__
,
1598 if (nfsi
->read_io
< t
->rd_io_sz
)
1603 if (t
->bm
& THRESHOLD_WR
) {
1604 dprintk("%s fsize %llu\n", __func__
, fsize
);
1606 if (fsize
< t
->wr_sz
)
1609 if (t
->bm
& THRESHOLD_WR_IO
) {
1610 dprintk("%s nfsi->write_io %llu\n", __func__
,
1613 if (nfsi
->write_io
< t
->wr_io_sz
)
1618 if (size_set
&& io_set
) {
1621 } else if (size
|| io
)
1624 dprintk("<-- %s size %d io %d ret %d\n", __func__
, size
, io
, ret
);
1628 static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr
*lo
)
1631 * send layoutcommit as it can hold up layoutreturn due to lseg
1634 pnfs_layoutcommit_inode(lo
->plh_inode
, false);
1635 return !wait_on_bit_action(&lo
->plh_flags
, NFS_LAYOUT_RETURN
,
1636 nfs_wait_bit_killable
,
1637 TASK_UNINTERRUPTIBLE
);
1640 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr
*lo
)
1642 unsigned long *bitlock
= &lo
->plh_flags
;
1644 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET
, bitlock
);
1645 smp_mb__after_atomic();
1646 wake_up_bit(bitlock
, NFS_LAYOUT_FIRST_LAYOUTGET
);
1650 * Layout segment is retreived from the server if not cached.
1651 * The appropriate layout segment is referenced and returned to the caller.
1653 struct pnfs_layout_segment
*
1654 pnfs_update_layout(struct inode
*ino
,
1655 struct nfs_open_context
*ctx
,
1658 enum pnfs_iomode iomode
,
1662 struct pnfs_layout_range arg
= {
1667 unsigned pg_offset
, seq
;
1668 struct nfs_server
*server
= NFS_SERVER(ino
);
1669 struct nfs_client
*clp
= server
->nfs_client
;
1670 struct pnfs_layout_hdr
*lo
= NULL
;
1671 struct pnfs_layout_segment
*lseg
= NULL
;
1672 nfs4_stateid stateid
;
1674 unsigned long giveup
= jiffies
+ (clp
->cl_lease_time
<< 1);
1677 if (!pnfs_enabled_sb(NFS_SERVER(ino
))) {
1678 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1679 PNFS_UPDATE_LAYOUT_NO_PNFS
);
1683 if (iomode
== IOMODE_READ
&& i_size_read(ino
) == 0) {
1684 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1685 PNFS_UPDATE_LAYOUT_RD_ZEROLEN
);
1689 if (pnfs_within_mdsthreshold(ctx
, ino
, iomode
)) {
1690 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1691 PNFS_UPDATE_LAYOUT_MDSTHRESH
);
1696 nfs4_client_recover_expired_lease(clp
);
1698 spin_lock(&ino
->i_lock
);
1699 lo
= pnfs_find_alloc_layout(ino
, ctx
, gfp_flags
);
1701 spin_unlock(&ino
->i_lock
);
1702 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1703 PNFS_UPDATE_LAYOUT_NOMEM
);
1707 /* Do we even need to bother with this? */
1708 if (test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
)) {
1709 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1710 PNFS_UPDATE_LAYOUT_BULK_RECALL
);
1711 dprintk("%s matches recall, use MDS\n", __func__
);
1715 /* if LAYOUTGET already failed once we don't try again */
1716 if (pnfs_layout_io_test_failed(lo
, iomode
)) {
1717 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1718 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL
);
1722 lseg
= pnfs_find_lseg(lo
, &arg
, strict_iomode
);
1724 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1725 PNFS_UPDATE_LAYOUT_FOUND_CACHED
);
1729 if (!nfs4_valid_open_stateid(ctx
->state
)) {
1730 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1731 PNFS_UPDATE_LAYOUT_INVALID_OPEN
);
1736 * Choose a stateid for the LAYOUTGET. If we don't have a layout
1737 * stateid, or it has been invalidated, then we must use the open
1740 if (test_bit(NFS_LAYOUT_INVALID_STID
, &lo
->plh_flags
)) {
1743 * The first layoutget for the file. Need to serialize per
1744 * RFC 5661 Errata 3208.
1746 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET
,
1748 spin_unlock(&ino
->i_lock
);
1749 wait_on_bit(&lo
->plh_flags
, NFS_LAYOUT_FIRST_LAYOUTGET
,
1750 TASK_UNINTERRUPTIBLE
);
1751 pnfs_put_layout_hdr(lo
);
1752 dprintk("%s retrying\n", __func__
);
1758 seq
= read_seqbegin(&ctx
->state
->seqlock
);
1759 nfs4_stateid_copy(&stateid
, &ctx
->state
->stateid
);
1760 } while (read_seqretry(&ctx
->state
->seqlock
, seq
));
1762 nfs4_stateid_copy(&stateid
, &lo
->plh_stateid
);
1766 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
1767 * for LAYOUTRETURN even if first is true.
1769 if (test_bit(NFS_LAYOUT_RETURN
, &lo
->plh_flags
)) {
1770 spin_unlock(&ino
->i_lock
);
1771 dprintk("%s wait for layoutreturn\n", __func__
);
1772 if (pnfs_prepare_to_retry_layoutget(lo
)) {
1774 pnfs_clear_first_layoutget(lo
);
1775 pnfs_put_layout_hdr(lo
);
1776 dprintk("%s retrying\n", __func__
);
1777 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
,
1778 lseg
, PNFS_UPDATE_LAYOUT_RETRY
);
1781 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1782 PNFS_UPDATE_LAYOUT_RETURN
);
1783 goto out_put_layout_hdr
;
1786 if (pnfs_layoutgets_blocked(lo
)) {
1787 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1788 PNFS_UPDATE_LAYOUT_BLOCKED
);
1791 atomic_inc(&lo
->plh_outstanding
);
1792 spin_unlock(&ino
->i_lock
);
1794 if (list_empty(&lo
->plh_layouts
)) {
1795 /* The lo must be on the clp list if there is any
1796 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1798 spin_lock(&clp
->cl_lock
);
1799 if (list_empty(&lo
->plh_layouts
))
1800 list_add_tail(&lo
->plh_layouts
, &server
->layouts
);
1801 spin_unlock(&clp
->cl_lock
);
1804 pg_offset
= arg
.offset
& ~PAGE_MASK
;
1806 arg
.offset
-= pg_offset
;
1807 arg
.length
+= pg_offset
;
1809 if (arg
.length
!= NFS4_MAX_UINT64
)
1810 arg
.length
= PAGE_ALIGN(arg
.length
);
1812 lseg
= send_layoutget(lo
, ctx
, &stateid
, &arg
, &timeout
, gfp_flags
);
1813 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1814 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET
);
1815 atomic_dec(&lo
->plh_outstanding
);
1817 switch(PTR_ERR(lseg
)) {
1819 if (time_after(jiffies
, giveup
))
1822 case -ERECALLCONFLICT
:
1823 /* Huh? We hold no layouts, how is there a recall? */
1828 /* Destroy the existing layout and start over */
1829 if (time_after(jiffies
, giveup
))
1830 pnfs_destroy_layout(NFS_I(ino
));
1835 if (!nfs_error_is_fatal(PTR_ERR(lseg
))) {
1836 pnfs_layout_clear_fail_bit(lo
, pnfs_iomode_to_fail_bit(iomode
));
1839 goto out_put_layout_hdr
;
1843 pnfs_clear_first_layoutget(lo
);
1844 trace_pnfs_update_layout(ino
, pos
, count
,
1845 iomode
, lo
, lseg
, PNFS_UPDATE_LAYOUT_RETRY
);
1846 pnfs_put_layout_hdr(lo
);
1850 pnfs_layout_clear_fail_bit(lo
, pnfs_iomode_to_fail_bit(iomode
));
1855 pnfs_clear_first_layoutget(lo
);
1856 pnfs_put_layout_hdr(lo
);
1858 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1859 "(%s, offset: %llu, length: %llu)\n",
1860 __func__
, ino
->i_sb
->s_id
,
1861 (unsigned long long)NFS_FILEID(ino
),
1862 IS_ERR_OR_NULL(lseg
) ? "not found" : "found",
1863 iomode
==IOMODE_RW
? "read/write" : "read-only",
1864 (unsigned long long)pos
,
1865 (unsigned long long)count
);
1868 spin_unlock(&ino
->i_lock
);
1869 goto out_put_layout_hdr
;
1871 EXPORT_SYMBOL_GPL(pnfs_update_layout
);
1874 pnfs_sanity_check_layout_range(struct pnfs_layout_range
*range
)
1876 switch (range
->iomode
) {
1883 if (range
->offset
== NFS4_MAX_UINT64
)
1885 if (range
->length
== 0)
1887 if (range
->length
!= NFS4_MAX_UINT64
&&
1888 range
->length
> NFS4_MAX_UINT64
- range
->offset
)
1893 struct pnfs_layout_segment
*
1894 pnfs_layout_process(struct nfs4_layoutget
*lgp
)
1896 struct pnfs_layout_hdr
*lo
= NFS_I(lgp
->args
.inode
)->layout
;
1897 struct nfs4_layoutget_res
*res
= &lgp
->res
;
1898 struct pnfs_layout_segment
*lseg
;
1899 struct inode
*ino
= lo
->plh_inode
;
1902 if (!pnfs_sanity_check_layout_range(&res
->range
))
1903 return ERR_PTR(-EINVAL
);
1905 /* Inject layout blob into I/O device driver */
1906 lseg
= NFS_SERVER(ino
)->pnfs_curr_ld
->alloc_lseg(lo
, res
, lgp
->gfp_flags
);
1907 if (IS_ERR_OR_NULL(lseg
)) {
1909 lseg
= ERR_PTR(-ENOMEM
);
1911 dprintk("%s: Could not allocate layout: error %ld\n",
1912 __func__
, PTR_ERR(lseg
));
1916 pnfs_init_lseg(lo
, lseg
, &res
->range
, &res
->stateid
);
1918 spin_lock(&ino
->i_lock
);
1919 if (pnfs_layoutgets_blocked(lo
)) {
1920 dprintk("%s forget reply due to state\n", __func__
);
1924 if (!pnfs_layout_is_valid(lo
)) {
1925 /* We have a completely new layout */
1926 pnfs_set_layout_stateid(lo
, &res
->stateid
, true);
1927 } else if (nfs4_stateid_match_other(&lo
->plh_stateid
, &res
->stateid
)) {
1928 /* existing state ID, make sure the sequence number matches. */
1929 if (pnfs_layout_stateid_blocked(lo
, &res
->stateid
)) {
1930 dprintk("%s forget reply due to sequence\n", __func__
);
1933 pnfs_set_layout_stateid(lo
, &res
->stateid
, false);
1936 * We got an entirely new state ID. Mark all segments for the
1937 * inode invalid, and retry the layoutget
1939 pnfs_mark_layout_stateid_invalid(lo
, &free_me
);
1943 pnfs_get_lseg(lseg
);
1944 pnfs_layout_insert_lseg(lo
, lseg
, &free_me
);
1947 if (res
->return_on_close
)
1948 set_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
);
1950 spin_unlock(&ino
->i_lock
);
1951 pnfs_free_lseg_list(&free_me
);
1955 spin_unlock(&ino
->i_lock
);
1956 lseg
->pls_layout
= lo
;
1957 NFS_SERVER(ino
)->pnfs_curr_ld
->free_lseg(lseg
);
1958 if (!pnfs_layout_is_valid(lo
))
1959 nfs_commit_inode(ino
, 0);
1960 return ERR_PTR(-EAGAIN
);
1964 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
1965 * @lo: pointer to layout header
1966 * @tmp_list: list header to be used with pnfs_free_lseg_list()
1967 * @return_range: describe layout segment ranges to be returned
1969 * This function is mainly intended for use by layoutrecall. It attempts
1970 * to free the layout segment immediately, or else to mark it for return
1971 * as soon as its reference count drops to zero.
1974 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr
*lo
,
1975 struct list_head
*tmp_list
,
1976 const struct pnfs_layout_range
*return_range
,
1979 struct pnfs_layout_segment
*lseg
, *next
;
1982 dprintk("%s:Begin lo %p\n", __func__
, lo
);
1984 if (list_empty(&lo
->plh_segs
))
1987 assert_spin_locked(&lo
->plh_inode
->i_lock
);
1989 list_for_each_entry_safe(lseg
, next
, &lo
->plh_segs
, pls_list
)
1990 if (pnfs_match_lseg_recall(lseg
, return_range
, seq
)) {
1991 dprintk("%s: marking lseg %p iomode %d "
1992 "offset %llu length %llu\n", __func__
,
1993 lseg
, lseg
->pls_range
.iomode
,
1994 lseg
->pls_range
.offset
,
1995 lseg
->pls_range
.length
);
1996 if (mark_lseg_invalid(lseg
, tmp_list
))
1999 set_bit(NFS_LSEG_LAYOUTRETURN
, &lseg
->pls_flags
);
2003 pnfs_set_plh_return_info(lo
, return_range
->iomode
, seq
);
2008 void pnfs_error_mark_layout_for_return(struct inode
*inode
,
2009 struct pnfs_layout_segment
*lseg
)
2011 struct pnfs_layout_hdr
*lo
= NFS_I(inode
)->layout
;
2012 struct pnfs_layout_range range
= {
2013 .iomode
= lseg
->pls_range
.iomode
,
2015 .length
= NFS4_MAX_UINT64
,
2017 bool return_now
= false;
2019 spin_lock(&inode
->i_lock
);
2020 if (!pnfs_layout_is_valid(lo
)) {
2021 spin_unlock(&inode
->i_lock
);
2024 pnfs_set_plh_return_info(lo
, range
.iomode
, 0);
2026 * mark all matching lsegs so that we are sure to have no live
2027 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
2030 if (!pnfs_mark_matching_lsegs_return(lo
, &lo
->plh_return_segs
, &range
, 0)) {
2031 nfs4_stateid stateid
;
2032 enum pnfs_iomode iomode
;
2034 return_now
= pnfs_prepare_layoutreturn(lo
, &stateid
, &iomode
);
2035 spin_unlock(&inode
->i_lock
);
2037 pnfs_send_layoutreturn(lo
, &stateid
, iomode
, false);
2039 spin_unlock(&inode
->i_lock
);
2040 nfs_commit_inode(inode
, 0);
2043 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return
);
2046 pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor
*pgio
)
2048 if (pgio
->pg_lseg
== NULL
||
2049 test_bit(NFS_LSEG_VALID
, &pgio
->pg_lseg
->pls_flags
))
2051 pnfs_put_lseg(pgio
->pg_lseg
);
2052 pgio
->pg_lseg
= NULL
;
2054 EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout
);
2057 * Check for any intersection between the request and the pgio->pg_lseg,
2058 * and if none, put this pgio->pg_lseg away.
2061 pnfs_generic_pg_check_range(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*req
)
2063 if (pgio
->pg_lseg
&& !pnfs_lseg_request_intersecting(pgio
->pg_lseg
, req
)) {
2064 pnfs_put_lseg(pgio
->pg_lseg
);
2065 pgio
->pg_lseg
= NULL
;
2070 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*req
)
2072 u64 rd_size
= req
->wb_bytes
;
2074 pnfs_generic_pg_check_layout(pgio
);
2075 pnfs_generic_pg_check_range(pgio
, req
);
2076 if (pgio
->pg_lseg
== NULL
) {
2077 if (pgio
->pg_dreq
== NULL
)
2078 rd_size
= i_size_read(pgio
->pg_inode
) - req_offset(req
);
2080 rd_size
= nfs_dreq_bytes_left(pgio
->pg_dreq
);
2082 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
2089 if (IS_ERR(pgio
->pg_lseg
)) {
2090 pgio
->pg_error
= PTR_ERR(pgio
->pg_lseg
);
2091 pgio
->pg_lseg
= NULL
;
2095 /* If no lseg, fall back to read through mds */
2096 if (pgio
->pg_lseg
== NULL
)
2097 nfs_pageio_reset_read_mds(pgio
);
2100 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read
);
2103 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor
*pgio
,
2104 struct nfs_page
*req
, u64 wb_size
)
2106 pnfs_generic_pg_check_layout(pgio
);
2107 pnfs_generic_pg_check_range(pgio
, req
);
2108 if (pgio
->pg_lseg
== NULL
) {
2109 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
2116 if (IS_ERR(pgio
->pg_lseg
)) {
2117 pgio
->pg_error
= PTR_ERR(pgio
->pg_lseg
);
2118 pgio
->pg_lseg
= NULL
;
2122 /* If no lseg, fall back to write through mds */
2123 if (pgio
->pg_lseg
== NULL
)
2124 nfs_pageio_reset_write_mds(pgio
);
2126 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write
);
2129 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor
*desc
)
2131 if (desc
->pg_lseg
) {
2132 pnfs_put_lseg(desc
->pg_lseg
);
2133 desc
->pg_lseg
= NULL
;
2136 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup
);
2139 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
2140 * of bytes (maximum @req->wb_bytes) that can be coalesced.
2143 pnfs_generic_pg_test(struct nfs_pageio_descriptor
*pgio
,
2144 struct nfs_page
*prev
, struct nfs_page
*req
)
2147 u64 seg_end
, req_start
, seg_left
;
2149 size
= nfs_generic_pg_test(pgio
, prev
, req
);
2154 * 'size' contains the number of bytes left in the current page (up
2155 * to the original size asked for in @req->wb_bytes).
2157 * Calculate how many bytes are left in the layout segment
2158 * and if there are less bytes than 'size', return that instead.
2160 * Please also note that 'end_offset' is actually the offset of the
2161 * first byte that lies outside the pnfs_layout_range. FIXME?
2164 if (pgio
->pg_lseg
) {
2165 seg_end
= pnfs_end_offset(pgio
->pg_lseg
->pls_range
.offset
,
2166 pgio
->pg_lseg
->pls_range
.length
);
2167 req_start
= req_offset(req
);
2169 /* start of request is past the last byte of this segment */
2170 if (req_start
>= seg_end
)
2173 /* adjust 'size' iff there are fewer bytes left in the
2174 * segment than what nfs_generic_pg_test returned */
2175 seg_left
= seg_end
- req_start
;
2176 if (seg_left
< size
)
2177 size
= (unsigned int)seg_left
;
2182 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test
);
2184 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header
*hdr
)
2186 struct nfs_pageio_descriptor pgio
;
2188 /* Resend all requests through the MDS */
2189 nfs_pageio_init_write(&pgio
, hdr
->inode
, FLUSH_STABLE
, true,
2190 hdr
->completion_ops
);
2191 set_bit(NFS_CONTEXT_RESEND_WRITES
, &hdr
->args
.context
->flags
);
2192 return nfs_pageio_resend(&pgio
, hdr
);
2194 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds
);
2196 static void pnfs_ld_handle_write_error(struct nfs_pgio_header
*hdr
)
2199 dprintk("pnfs write error = %d\n", hdr
->pnfs_error
);
2200 if (NFS_SERVER(hdr
->inode
)->pnfs_curr_ld
->flags
&
2201 PNFS_LAYOUTRET_ON_ERROR
) {
2202 pnfs_return_layout(hdr
->inode
);
2204 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
))
2205 hdr
->task
.tk_status
= pnfs_write_done_resend_to_mds(hdr
);
2209 * Called by non rpc-based layout drivers
2211 void pnfs_ld_write_done(struct nfs_pgio_header
*hdr
)
2213 if (likely(!hdr
->pnfs_error
)) {
2214 pnfs_set_layoutcommit(hdr
->inode
, hdr
->lseg
,
2215 hdr
->mds_offset
+ hdr
->res
.count
);
2216 hdr
->mds_ops
->rpc_call_done(&hdr
->task
, hdr
);
2218 trace_nfs4_pnfs_write(hdr
, hdr
->pnfs_error
);
2219 if (unlikely(hdr
->pnfs_error
))
2220 pnfs_ld_handle_write_error(hdr
);
2221 hdr
->mds_ops
->rpc_release(hdr
);
2223 EXPORT_SYMBOL_GPL(pnfs_ld_write_done
);
2226 pnfs_write_through_mds(struct nfs_pageio_descriptor
*desc
,
2227 struct nfs_pgio_header
*hdr
)
2229 struct nfs_pgio_mirror
*mirror
= nfs_pgio_current_mirror(desc
);
2231 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
2232 list_splice_tail_init(&hdr
->pages
, &mirror
->pg_list
);
2233 nfs_pageio_reset_write_mds(desc
);
2234 mirror
->pg_recoalesce
= 1;
2239 static enum pnfs_try_status
2240 pnfs_try_to_write_data(struct nfs_pgio_header
*hdr
,
2241 const struct rpc_call_ops
*call_ops
,
2242 struct pnfs_layout_segment
*lseg
,
2245 struct inode
*inode
= hdr
->inode
;
2246 enum pnfs_try_status trypnfs
;
2247 struct nfs_server
*nfss
= NFS_SERVER(inode
);
2249 hdr
->mds_ops
= call_ops
;
2251 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__
,
2252 inode
->i_ino
, hdr
->args
.count
, hdr
->args
.offset
, how
);
2253 trypnfs
= nfss
->pnfs_curr_ld
->write_pagelist(hdr
, how
);
2254 if (trypnfs
!= PNFS_NOT_ATTEMPTED
)
2255 nfs_inc_stats(inode
, NFSIOS_PNFS_WRITE
);
2256 dprintk("%s End (trypnfs:%d)\n", __func__
, trypnfs
);
2261 pnfs_do_write(struct nfs_pageio_descriptor
*desc
,
2262 struct nfs_pgio_header
*hdr
, int how
)
2264 const struct rpc_call_ops
*call_ops
= desc
->pg_rpc_callops
;
2265 struct pnfs_layout_segment
*lseg
= desc
->pg_lseg
;
2266 enum pnfs_try_status trypnfs
;
2268 trypnfs
= pnfs_try_to_write_data(hdr
, call_ops
, lseg
, how
);
2270 case PNFS_NOT_ATTEMPTED
:
2271 pnfs_write_through_mds(desc
, hdr
);
2272 case PNFS_ATTEMPTED
:
2274 case PNFS_TRY_AGAIN
:
2275 /* cleanup hdr and prepare to redo pnfs */
2276 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
2277 struct nfs_pgio_mirror
*mirror
= nfs_pgio_current_mirror(desc
);
2278 list_splice_init(&hdr
->pages
, &mirror
->pg_list
);
2279 mirror
->pg_recoalesce
= 1;
2281 hdr
->mds_ops
->rpc_release(hdr
);
2285 static void pnfs_writehdr_free(struct nfs_pgio_header
*hdr
)
2287 pnfs_put_lseg(hdr
->lseg
);
2288 nfs_pgio_header_free(hdr
);
2292 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor
*desc
)
2294 struct nfs_pgio_header
*hdr
;
2297 hdr
= nfs_pgio_header_alloc(desc
->pg_rw_ops
);
2299 desc
->pg_error
= -ENOMEM
;
2300 return desc
->pg_error
;
2302 nfs_pgheader_init(desc
, hdr
, pnfs_writehdr_free
);
2304 hdr
->lseg
= pnfs_get_lseg(desc
->pg_lseg
);
2305 ret
= nfs_generic_pgio(desc
, hdr
);
2307 pnfs_do_write(desc
, hdr
, desc
->pg_ioflags
);
2311 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages
);
2313 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header
*hdr
)
2315 struct nfs_pageio_descriptor pgio
;
2317 /* Resend all requests through the MDS */
2318 nfs_pageio_init_read(&pgio
, hdr
->inode
, true, hdr
->completion_ops
);
2319 return nfs_pageio_resend(&pgio
, hdr
);
2321 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds
);
2323 static void pnfs_ld_handle_read_error(struct nfs_pgio_header
*hdr
)
2325 dprintk("pnfs read error = %d\n", hdr
->pnfs_error
);
2326 if (NFS_SERVER(hdr
->inode
)->pnfs_curr_ld
->flags
&
2327 PNFS_LAYOUTRET_ON_ERROR
) {
2328 pnfs_return_layout(hdr
->inode
);
2330 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
))
2331 hdr
->task
.tk_status
= pnfs_read_done_resend_to_mds(hdr
);
2335 * Called by non rpc-based layout drivers
2337 void pnfs_ld_read_done(struct nfs_pgio_header
*hdr
)
2339 if (likely(!hdr
->pnfs_error
))
2340 hdr
->mds_ops
->rpc_call_done(&hdr
->task
, hdr
);
2341 trace_nfs4_pnfs_read(hdr
, hdr
->pnfs_error
);
2342 if (unlikely(hdr
->pnfs_error
))
2343 pnfs_ld_handle_read_error(hdr
);
2344 hdr
->mds_ops
->rpc_release(hdr
);
2346 EXPORT_SYMBOL_GPL(pnfs_ld_read_done
);
2349 pnfs_read_through_mds(struct nfs_pageio_descriptor
*desc
,
2350 struct nfs_pgio_header
*hdr
)
2352 struct nfs_pgio_mirror
*mirror
= nfs_pgio_current_mirror(desc
);
2354 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
2355 list_splice_tail_init(&hdr
->pages
, &mirror
->pg_list
);
2356 nfs_pageio_reset_read_mds(desc
);
2357 mirror
->pg_recoalesce
= 1;
2363 * Call the appropriate parallel I/O subsystem read function.
2365 static enum pnfs_try_status
2366 pnfs_try_to_read_data(struct nfs_pgio_header
*hdr
,
2367 const struct rpc_call_ops
*call_ops
,
2368 struct pnfs_layout_segment
*lseg
)
2370 struct inode
*inode
= hdr
->inode
;
2371 struct nfs_server
*nfss
= NFS_SERVER(inode
);
2372 enum pnfs_try_status trypnfs
;
2374 hdr
->mds_ops
= call_ops
;
2376 dprintk("%s: Reading ino:%lu %u@%llu\n",
2377 __func__
, inode
->i_ino
, hdr
->args
.count
, hdr
->args
.offset
);
2379 trypnfs
= nfss
->pnfs_curr_ld
->read_pagelist(hdr
);
2380 if (trypnfs
!= PNFS_NOT_ATTEMPTED
)
2381 nfs_inc_stats(inode
, NFSIOS_PNFS_READ
);
2382 dprintk("%s End (trypnfs:%d)\n", __func__
, trypnfs
);
2386 /* Resend all requests through pnfs. */
2387 void pnfs_read_resend_pnfs(struct nfs_pgio_header
*hdr
)
2389 struct nfs_pageio_descriptor pgio
;
2391 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
2392 /* Prevent deadlocks with layoutreturn! */
2393 pnfs_put_lseg(hdr
->lseg
);
2396 nfs_pageio_init_read(&pgio
, hdr
->inode
, false,
2397 hdr
->completion_ops
);
2398 hdr
->task
.tk_status
= nfs_pageio_resend(&pgio
, hdr
);
2401 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs
);
2404 pnfs_do_read(struct nfs_pageio_descriptor
*desc
, struct nfs_pgio_header
*hdr
)
2406 const struct rpc_call_ops
*call_ops
= desc
->pg_rpc_callops
;
2407 struct pnfs_layout_segment
*lseg
= desc
->pg_lseg
;
2408 enum pnfs_try_status trypnfs
;
2410 trypnfs
= pnfs_try_to_read_data(hdr
, call_ops
, lseg
);
2412 case PNFS_NOT_ATTEMPTED
:
2413 pnfs_read_through_mds(desc
, hdr
);
2414 case PNFS_ATTEMPTED
:
2416 case PNFS_TRY_AGAIN
:
2417 /* cleanup hdr and prepare to redo pnfs */
2418 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
2419 struct nfs_pgio_mirror
*mirror
= nfs_pgio_current_mirror(desc
);
2420 list_splice_init(&hdr
->pages
, &mirror
->pg_list
);
2421 mirror
->pg_recoalesce
= 1;
2423 hdr
->mds_ops
->rpc_release(hdr
);
2427 static void pnfs_readhdr_free(struct nfs_pgio_header
*hdr
)
2429 pnfs_put_lseg(hdr
->lseg
);
2430 nfs_pgio_header_free(hdr
);
2434 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor
*desc
)
2436 struct nfs_pgio_header
*hdr
;
2439 hdr
= nfs_pgio_header_alloc(desc
->pg_rw_ops
);
2441 desc
->pg_error
= -ENOMEM
;
2442 return desc
->pg_error
;
2444 nfs_pgheader_init(desc
, hdr
, pnfs_readhdr_free
);
2445 hdr
->lseg
= pnfs_get_lseg(desc
->pg_lseg
);
2446 ret
= nfs_generic_pgio(desc
, hdr
);
2448 pnfs_do_read(desc
, hdr
);
2451 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages
);
2453 static void pnfs_clear_layoutcommitting(struct inode
*inode
)
2455 unsigned long *bitlock
= &NFS_I(inode
)->flags
;
2457 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING
, bitlock
);
2458 smp_mb__after_atomic();
2459 wake_up_bit(bitlock
, NFS_INO_LAYOUTCOMMITTING
);
2463 * There can be multiple RW segments.
2465 static void pnfs_list_write_lseg(struct inode
*inode
, struct list_head
*listp
)
2467 struct pnfs_layout_segment
*lseg
;
2469 list_for_each_entry(lseg
, &NFS_I(inode
)->layout
->plh_segs
, pls_list
) {
2470 if (lseg
->pls_range
.iomode
== IOMODE_RW
&&
2471 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
))
2472 list_add(&lseg
->pls_lc_list
, listp
);
2476 static void pnfs_list_write_lseg_done(struct inode
*inode
, struct list_head
*listp
)
2478 struct pnfs_layout_segment
*lseg
, *tmp
;
2480 /* Matched by references in pnfs_set_layoutcommit */
2481 list_for_each_entry_safe(lseg
, tmp
, listp
, pls_lc_list
) {
2482 list_del_init(&lseg
->pls_lc_list
);
2483 pnfs_put_lseg(lseg
);
2486 pnfs_clear_layoutcommitting(inode
);
2489 void pnfs_set_lo_fail(struct pnfs_layout_segment
*lseg
)
2491 pnfs_layout_io_set_failed(lseg
->pls_layout
, lseg
->pls_range
.iomode
);
2493 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail
);
2496 pnfs_set_layoutcommit(struct inode
*inode
, struct pnfs_layout_segment
*lseg
,
2499 struct nfs_inode
*nfsi
= NFS_I(inode
);
2500 bool mark_as_dirty
= false;
2502 spin_lock(&inode
->i_lock
);
2503 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
)) {
2504 nfsi
->layout
->plh_lwb
= end_pos
;
2505 mark_as_dirty
= true;
2506 dprintk("%s: Set layoutcommit for inode %lu ",
2507 __func__
, inode
->i_ino
);
2508 } else if (end_pos
> nfsi
->layout
->plh_lwb
)
2509 nfsi
->layout
->plh_lwb
= end_pos
;
2510 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
)) {
2511 /* references matched in nfs4_layoutcommit_release */
2512 pnfs_get_lseg(lseg
);
2514 spin_unlock(&inode
->i_lock
);
2515 dprintk("%s: lseg %p end_pos %llu\n",
2516 __func__
, lseg
, nfsi
->layout
->plh_lwb
);
2518 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2519 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2521 mark_inode_dirty_sync(inode
);
2523 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit
);
2525 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data
*data
)
2527 struct nfs_server
*nfss
= NFS_SERVER(data
->args
.inode
);
2529 if (nfss
->pnfs_curr_ld
->cleanup_layoutcommit
)
2530 nfss
->pnfs_curr_ld
->cleanup_layoutcommit(data
);
2531 pnfs_list_write_lseg_done(data
->args
.inode
, &data
->lseg_list
);
2535 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
2536 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
2537 * data to disk to allow the server to recover the data if it crashes.
2538 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
2539 * is off, and a COMMIT is sent to a data server, or
2540 * if WRITEs to a data server return NFS_DATA_SYNC.
2543 pnfs_layoutcommit_inode(struct inode
*inode
, bool sync
)
2545 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(inode
)->pnfs_curr_ld
;
2546 struct nfs4_layoutcommit_data
*data
;
2547 struct nfs_inode
*nfsi
= NFS_I(inode
);
2551 if (!pnfs_layoutcommit_outstanding(inode
))
2554 dprintk("--> %s inode %lu\n", __func__
, inode
->i_ino
);
2557 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING
, &nfsi
->flags
)) {
2560 status
= wait_on_bit_lock_action(&nfsi
->flags
,
2561 NFS_INO_LAYOUTCOMMITTING
,
2562 nfs_wait_bit_killable
,
2569 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
2570 data
= kzalloc(sizeof(*data
), GFP_NOFS
);
2572 goto clear_layoutcommitting
;
2575 spin_lock(&inode
->i_lock
);
2576 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
))
2579 INIT_LIST_HEAD(&data
->lseg_list
);
2580 pnfs_list_write_lseg(inode
, &data
->lseg_list
);
2582 end_pos
= nfsi
->layout
->plh_lwb
;
2584 nfs4_stateid_copy(&data
->args
.stateid
, &nfsi
->layout
->plh_stateid
);
2585 spin_unlock(&inode
->i_lock
);
2587 data
->args
.inode
= inode
;
2588 data
->cred
= get_rpccred(nfsi
->layout
->plh_lc_cred
);
2589 nfs_fattr_init(&data
->fattr
);
2590 data
->args
.bitmask
= NFS_SERVER(inode
)->cache_consistency_bitmask
;
2591 data
->res
.fattr
= &data
->fattr
;
2593 data
->args
.lastbytewritten
= end_pos
- 1;
2595 data
->args
.lastbytewritten
= U64_MAX
;
2596 data
->res
.server
= NFS_SERVER(inode
);
2598 if (ld
->prepare_layoutcommit
) {
2599 status
= ld
->prepare_layoutcommit(&data
->args
);
2601 put_rpccred(data
->cred
);
2602 spin_lock(&inode
->i_lock
);
2603 set_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
);
2604 if (end_pos
> nfsi
->layout
->plh_lwb
)
2605 nfsi
->layout
->plh_lwb
= end_pos
;
2611 status
= nfs4_proc_layoutcommit(data
, sync
);
2614 mark_inode_dirty_sync(inode
);
2615 dprintk("<-- %s status %d\n", __func__
, status
);
2618 spin_unlock(&inode
->i_lock
);
2620 clear_layoutcommitting
:
2621 pnfs_clear_layoutcommitting(inode
);
2624 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode
);
2627 pnfs_generic_sync(struct inode
*inode
, bool datasync
)
2629 return pnfs_layoutcommit_inode(inode
, true);
2631 EXPORT_SYMBOL_GPL(pnfs_generic_sync
);
2633 struct nfs4_threshold
*pnfs_mdsthreshold_alloc(void)
2635 struct nfs4_threshold
*thp
;
2637 thp
= kzalloc(sizeof(*thp
), GFP_NOFS
);
2639 dprintk("%s mdsthreshold allocation failed\n", __func__
);
2645 #if IS_ENABLED(CONFIG_NFS_V4_2)
2647 pnfs_report_layoutstat(struct inode
*inode
, gfp_t gfp_flags
)
2649 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(inode
)->pnfs_curr_ld
;
2650 struct nfs_server
*server
= NFS_SERVER(inode
);
2651 struct nfs_inode
*nfsi
= NFS_I(inode
);
2652 struct nfs42_layoutstat_data
*data
;
2653 struct pnfs_layout_hdr
*hdr
;
2656 if (!pnfs_enabled_sb(server
) || !ld
->prepare_layoutstats
)
2659 if (!nfs_server_capable(inode
, NFS_CAP_LAYOUTSTATS
))
2662 if (test_and_set_bit(NFS_INO_LAYOUTSTATS
, &nfsi
->flags
))
2665 spin_lock(&inode
->i_lock
);
2666 if (!NFS_I(inode
)->layout
) {
2667 spin_unlock(&inode
->i_lock
);
2668 goto out_clear_layoutstats
;
2670 hdr
= NFS_I(inode
)->layout
;
2671 pnfs_get_layout_hdr(hdr
);
2672 spin_unlock(&inode
->i_lock
);
2674 data
= kzalloc(sizeof(*data
), gfp_flags
);
2680 data
->args
.fh
= NFS_FH(inode
);
2681 data
->args
.inode
= inode
;
2682 status
= ld
->prepare_layoutstats(&data
->args
);
2686 status
= nfs42_proc_layoutstats_generic(NFS_SERVER(inode
), data
);
2689 dprintk("%s returns %d\n", __func__
, status
);
2695 pnfs_put_layout_hdr(hdr
);
2696 out_clear_layoutstats
:
2697 smp_mb__before_atomic();
2698 clear_bit(NFS_INO_LAYOUTSTATS
, &nfsi
->flags
);
2699 smp_mb__after_atomic();
2702 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat
);
2705 unsigned int layoutstats_timer
;
2706 module_param(layoutstats_timer
, uint
, 0644);
2707 EXPORT_SYMBOL_GPL(layoutstats_timer
);