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>
36 #include "nfs4trace.h"
37 #include "delegation.h"
40 #define NFSDBG_FACILITY NFSDBG_PNFS
41 #define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
46 * protects pnfs_modules_tbl.
48 static DEFINE_SPINLOCK(pnfs_spinlock
);
51 * pnfs_modules_tbl holds all pnfs modules
53 static LIST_HEAD(pnfs_modules_tbl
);
55 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr
*lo
);
57 /* Return the registered pnfs layout driver module matching given id */
58 static struct pnfs_layoutdriver_type
*
59 find_pnfs_driver_locked(u32 id
)
61 struct pnfs_layoutdriver_type
*local
;
63 list_for_each_entry(local
, &pnfs_modules_tbl
, pnfs_tblid
)
68 dprintk("%s: Searching for id %u, found %p\n", __func__
, id
, local
);
72 static struct pnfs_layoutdriver_type
*
73 find_pnfs_driver(u32 id
)
75 struct pnfs_layoutdriver_type
*local
;
77 spin_lock(&pnfs_spinlock
);
78 local
= find_pnfs_driver_locked(id
);
79 if (local
!= NULL
&& !try_module_get(local
->owner
)) {
80 dprintk("%s: Could not grab reference on module\n", __func__
);
83 spin_unlock(&pnfs_spinlock
);
88 unset_pnfs_layoutdriver(struct nfs_server
*nfss
)
90 if (nfss
->pnfs_curr_ld
) {
91 if (nfss
->pnfs_curr_ld
->clear_layoutdriver
)
92 nfss
->pnfs_curr_ld
->clear_layoutdriver(nfss
);
93 /* Decrement the MDS count. Purge the deviceid cache if zero */
94 if (atomic_dec_and_test(&nfss
->nfs_client
->cl_mds_count
))
95 nfs4_deviceid_purge_client(nfss
->nfs_client
);
96 module_put(nfss
->pnfs_curr_ld
->owner
);
98 nfss
->pnfs_curr_ld
= NULL
;
102 * Try to set the server's pnfs module to the pnfs layout type specified by id.
103 * Currently only one pNFS layout driver per filesystem is supported.
105 * @id layout type. Zero (illegal layout type) indicates pNFS not in use.
108 set_pnfs_layoutdriver(struct nfs_server
*server
, const struct nfs_fh
*mntfh
,
111 struct pnfs_layoutdriver_type
*ld_type
= NULL
;
115 if (!(server
->nfs_client
->cl_exchange_flags
&
116 (EXCHGID4_FLAG_USE_NON_PNFS
| EXCHGID4_FLAG_USE_PNFS_MDS
))) {
117 printk(KERN_ERR
"NFS: %s: id %u cl_exchange_flags 0x%x\n",
118 __func__
, id
, server
->nfs_client
->cl_exchange_flags
);
121 ld_type
= find_pnfs_driver(id
);
123 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX
, id
);
124 ld_type
= find_pnfs_driver(id
);
126 dprintk("%s: No pNFS module found for %u.\n",
131 server
->pnfs_curr_ld
= ld_type
;
132 if (ld_type
->set_layoutdriver
133 && ld_type
->set_layoutdriver(server
, mntfh
)) {
134 printk(KERN_ERR
"NFS: %s: Error initializing pNFS layout "
135 "driver %u.\n", __func__
, id
);
136 module_put(ld_type
->owner
);
139 /* Bump the MDS count */
140 atomic_inc(&server
->nfs_client
->cl_mds_count
);
142 dprintk("%s: pNFS module for %u set\n", __func__
, id
);
146 dprintk("%s: Using NFSv4 I/O\n", __func__
);
147 server
->pnfs_curr_ld
= NULL
;
151 pnfs_register_layoutdriver(struct pnfs_layoutdriver_type
*ld_type
)
153 int status
= -EINVAL
;
154 struct pnfs_layoutdriver_type
*tmp
;
156 if (ld_type
->id
== 0) {
157 printk(KERN_ERR
"NFS: %s id 0 is reserved\n", __func__
);
160 if (!ld_type
->alloc_lseg
|| !ld_type
->free_lseg
) {
161 printk(KERN_ERR
"NFS: %s Layout driver must provide "
162 "alloc_lseg and free_lseg.\n", __func__
);
166 spin_lock(&pnfs_spinlock
);
167 tmp
= find_pnfs_driver_locked(ld_type
->id
);
169 list_add(&ld_type
->pnfs_tblid
, &pnfs_modules_tbl
);
171 dprintk("%s Registering id:%u name:%s\n", __func__
, ld_type
->id
,
174 printk(KERN_ERR
"NFS: %s Module with id %d already loaded!\n",
175 __func__
, ld_type
->id
);
177 spin_unlock(&pnfs_spinlock
);
181 EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver
);
184 pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type
*ld_type
)
186 dprintk("%s Deregistering id:%u\n", __func__
, ld_type
->id
);
187 spin_lock(&pnfs_spinlock
);
188 list_del(&ld_type
->pnfs_tblid
);
189 spin_unlock(&pnfs_spinlock
);
191 EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver
);
194 * pNFS client layout cache
197 /* Need to hold i_lock if caller does not already hold reference */
199 pnfs_get_layout_hdr(struct pnfs_layout_hdr
*lo
)
201 atomic_inc(&lo
->plh_refcount
);
204 static struct pnfs_layout_hdr
*
205 pnfs_alloc_layout_hdr(struct inode
*ino
, gfp_t gfp_flags
)
207 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(ino
)->pnfs_curr_ld
;
208 return ld
->alloc_layout_hdr(ino
, gfp_flags
);
212 pnfs_free_layout_hdr(struct pnfs_layout_hdr
*lo
)
214 struct nfs_server
*server
= NFS_SERVER(lo
->plh_inode
);
215 struct pnfs_layoutdriver_type
*ld
= server
->pnfs_curr_ld
;
217 if (!list_empty(&lo
->plh_layouts
)) {
218 struct nfs_client
*clp
= server
->nfs_client
;
220 spin_lock(&clp
->cl_lock
);
221 list_del_init(&lo
->plh_layouts
);
222 spin_unlock(&clp
->cl_lock
);
224 put_rpccred(lo
->plh_lc_cred
);
225 return ld
->free_layout_hdr(lo
);
229 pnfs_detach_layout_hdr(struct pnfs_layout_hdr
*lo
)
231 struct nfs_inode
*nfsi
= NFS_I(lo
->plh_inode
);
232 dprintk("%s: freeing layout cache %p\n", __func__
, lo
);
234 /* Reset MDS Threshold I/O counters */
240 pnfs_put_layout_hdr(struct pnfs_layout_hdr
*lo
)
242 struct inode
*inode
= lo
->plh_inode
;
244 pnfs_layoutreturn_before_put_layout_hdr(lo
);
246 if (atomic_dec_and_lock(&lo
->plh_refcount
, &inode
->i_lock
)) {
247 if (!list_empty(&lo
->plh_segs
))
248 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
249 pnfs_detach_layout_hdr(lo
);
250 spin_unlock(&inode
->i_lock
);
251 pnfs_free_layout_hdr(lo
);
256 * Mark a pnfs_layout_hdr and all associated layout segments as invalid
258 * In order to continue using the pnfs_layout_hdr, a full recovery
260 * Note that caller must hold inode->i_lock.
263 pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr
*lo
,
264 struct list_head
*lseg_list
)
266 struct pnfs_layout_range range
= {
267 .iomode
= IOMODE_ANY
,
269 .length
= NFS4_MAX_UINT64
,
272 set_bit(NFS_LAYOUT_INVALID_STID
, &lo
->plh_flags
);
273 return pnfs_mark_matching_lsegs_invalid(lo
, lseg_list
, &range
, 0);
277 pnfs_iomode_to_fail_bit(u32 iomode
)
279 return iomode
== IOMODE_RW
?
280 NFS_LAYOUT_RW_FAILED
: NFS_LAYOUT_RO_FAILED
;
284 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr
*lo
, int fail_bit
)
286 lo
->plh_retry_timestamp
= jiffies
;
287 if (!test_and_set_bit(fail_bit
, &lo
->plh_flags
))
288 atomic_inc(&lo
->plh_refcount
);
292 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr
*lo
, int fail_bit
)
294 if (test_and_clear_bit(fail_bit
, &lo
->plh_flags
))
295 atomic_dec(&lo
->plh_refcount
);
299 pnfs_layout_io_set_failed(struct pnfs_layout_hdr
*lo
, u32 iomode
)
301 struct inode
*inode
= lo
->plh_inode
;
302 struct pnfs_layout_range range
= {
305 .length
= NFS4_MAX_UINT64
,
309 spin_lock(&inode
->i_lock
);
310 pnfs_layout_set_fail_bit(lo
, pnfs_iomode_to_fail_bit(iomode
));
311 pnfs_mark_matching_lsegs_invalid(lo
, &head
, &range
, 0);
312 spin_unlock(&inode
->i_lock
);
313 pnfs_free_lseg_list(&head
);
314 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__
,
315 iomode
== IOMODE_RW
? "RW" : "READ");
319 pnfs_layout_io_test_failed(struct pnfs_layout_hdr
*lo
, u32 iomode
)
321 unsigned long start
, end
;
322 int fail_bit
= pnfs_iomode_to_fail_bit(iomode
);
324 if (test_bit(fail_bit
, &lo
->plh_flags
) == 0)
327 start
= end
- PNFS_LAYOUTGET_RETRY_TIMEOUT
;
328 if (!time_in_range(lo
->plh_retry_timestamp
, start
, end
)) {
329 /* It is time to retry the failed layoutgets */
330 pnfs_layout_clear_fail_bit(lo
, fail_bit
);
337 init_lseg(struct pnfs_layout_hdr
*lo
, struct pnfs_layout_segment
*lseg
)
339 INIT_LIST_HEAD(&lseg
->pls_list
);
340 INIT_LIST_HEAD(&lseg
->pls_lc_list
);
341 atomic_set(&lseg
->pls_refcount
, 1);
343 set_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
);
344 lseg
->pls_layout
= lo
;
347 static void pnfs_free_lseg(struct pnfs_layout_segment
*lseg
)
349 struct inode
*ino
= lseg
->pls_layout
->plh_inode
;
351 NFS_SERVER(ino
)->pnfs_curr_ld
->free_lseg(lseg
);
355 pnfs_layout_remove_lseg(struct pnfs_layout_hdr
*lo
,
356 struct pnfs_layout_segment
*lseg
)
358 struct inode
*inode
= lo
->plh_inode
;
360 WARN_ON(test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
));
361 list_del_init(&lseg
->pls_list
);
362 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
363 atomic_dec(&lo
->plh_refcount
);
364 if (list_empty(&lo
->plh_segs
))
365 clear_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
);
366 rpc_wake_up(&NFS_SERVER(inode
)->roc_rpcwaitq
);
370 pnfs_put_lseg(struct pnfs_layout_segment
*lseg
)
372 struct pnfs_layout_hdr
*lo
;
378 dprintk("%s: lseg %p ref %d valid %d\n", __func__
, lseg
,
379 atomic_read(&lseg
->pls_refcount
),
380 test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
));
382 lo
= lseg
->pls_layout
;
383 inode
= lo
->plh_inode
;
385 if (atomic_dec_and_lock(&lseg
->pls_refcount
, &inode
->i_lock
)) {
386 if (test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
)) {
387 spin_unlock(&inode
->i_lock
);
390 pnfs_get_layout_hdr(lo
);
391 pnfs_layout_remove_lseg(lo
, lseg
);
392 spin_unlock(&inode
->i_lock
);
393 pnfs_free_lseg(lseg
);
394 pnfs_put_layout_hdr(lo
);
397 EXPORT_SYMBOL_GPL(pnfs_put_lseg
);
399 static void pnfs_free_lseg_async_work(struct work_struct
*work
)
401 struct pnfs_layout_segment
*lseg
;
402 struct pnfs_layout_hdr
*lo
;
404 lseg
= container_of(work
, struct pnfs_layout_segment
, pls_work
);
405 lo
= lseg
->pls_layout
;
407 pnfs_free_lseg(lseg
);
408 pnfs_put_layout_hdr(lo
);
411 static void pnfs_free_lseg_async(struct pnfs_layout_segment
*lseg
)
413 INIT_WORK(&lseg
->pls_work
, pnfs_free_lseg_async_work
);
414 schedule_work(&lseg
->pls_work
);
418 pnfs_put_lseg_locked(struct pnfs_layout_segment
*lseg
)
423 assert_spin_locked(&lseg
->pls_layout
->plh_inode
->i_lock
);
425 dprintk("%s: lseg %p ref %d valid %d\n", __func__
, lseg
,
426 atomic_read(&lseg
->pls_refcount
),
427 test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
));
428 if (atomic_dec_and_test(&lseg
->pls_refcount
)) {
429 struct pnfs_layout_hdr
*lo
= lseg
->pls_layout
;
430 if (test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
))
432 pnfs_get_layout_hdr(lo
);
433 pnfs_layout_remove_lseg(lo
, lseg
);
434 pnfs_free_lseg_async(lseg
);
437 EXPORT_SYMBOL_GPL(pnfs_put_lseg_locked
);
440 end_offset(u64 start
, u64 len
)
445 return end
>= start
? end
: NFS4_MAX_UINT64
;
449 * is l2 fully contained in l1?
451 * [----------------------------------)
456 pnfs_lseg_range_contained(const struct pnfs_layout_range
*l1
,
457 const struct pnfs_layout_range
*l2
)
459 u64 start1
= l1
->offset
;
460 u64 end1
= end_offset(start1
, l1
->length
);
461 u64 start2
= l2
->offset
;
462 u64 end2
= end_offset(start2
, l2
->length
);
464 return (start1
<= start2
) && (end1
>= end2
);
468 * is l1 and l2 intersecting?
470 * [----------------------------------)
475 pnfs_lseg_range_intersecting(const struct pnfs_layout_range
*l1
,
476 const struct pnfs_layout_range
*l2
)
478 u64 start1
= l1
->offset
;
479 u64 end1
= end_offset(start1
, l1
->length
);
480 u64 start2
= l2
->offset
;
481 u64 end2
= end_offset(start2
, l2
->length
);
483 return (end1
== NFS4_MAX_UINT64
|| end1
> start2
) &&
484 (end2
== NFS4_MAX_UINT64
|| end2
> start1
);
488 should_free_lseg(const struct pnfs_layout_range
*lseg_range
,
489 const struct pnfs_layout_range
*recall_range
)
491 return (recall_range
->iomode
== IOMODE_ANY
||
492 lseg_range
->iomode
== recall_range
->iomode
) &&
493 pnfs_lseg_range_intersecting(lseg_range
, recall_range
);
496 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment
*lseg
,
497 struct list_head
*tmp_list
)
499 if (!atomic_dec_and_test(&lseg
->pls_refcount
))
501 pnfs_layout_remove_lseg(lseg
->pls_layout
, lseg
);
502 list_add(&lseg
->pls_list
, tmp_list
);
506 /* Returns 1 if lseg is removed from list, 0 otherwise */
507 static int mark_lseg_invalid(struct pnfs_layout_segment
*lseg
,
508 struct list_head
*tmp_list
)
512 if (test_and_clear_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
)) {
513 /* Remove the reference keeping the lseg in the
514 * list. It will now be removed when all
515 * outstanding io is finished.
517 dprintk("%s: lseg %p ref %d\n", __func__
, lseg
,
518 atomic_read(&lseg
->pls_refcount
));
519 if (pnfs_lseg_dec_and_remove_zero(lseg
, tmp_list
))
526 * Compare 2 layout stateid sequence ids, to see which is newer,
527 * taking into account wraparound issues.
529 static bool pnfs_seqid_is_newer(u32 s1
, u32 s2
)
531 return (s32
)(s1
- s2
) > 0;
535 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later
536 * @lo: layout header containing the lsegs
537 * @tmp_list: list head where doomed lsegs should go
538 * @recall_range: optional recall range argument to match (may be NULL)
539 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0)
541 * Walk the list of lsegs in the layout header, and tear down any that should
542 * be destroyed. If "recall_range" is specified then the segment must match
543 * that range. If "seq" is non-zero, then only match segments that were handed
544 * out at or before that sequence.
546 * Returns number of matching invalid lsegs remaining in list after scanning
547 * it and purging them.
550 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr
*lo
,
551 struct list_head
*tmp_list
,
552 const struct pnfs_layout_range
*recall_range
,
555 struct pnfs_layout_segment
*lseg
, *next
;
558 dprintk("%s:Begin lo %p\n", __func__
, lo
);
560 if (list_empty(&lo
->plh_segs
))
562 list_for_each_entry_safe(lseg
, next
, &lo
->plh_segs
, pls_list
)
564 should_free_lseg(&lseg
->pls_range
, recall_range
)) {
565 if (seq
&& pnfs_seqid_is_newer(lseg
->pls_seq
, seq
))
567 dprintk("%s: freeing lseg %p iomode %d seq %u"
568 "offset %llu length %llu\n", __func__
,
569 lseg
, lseg
->pls_range
.iomode
, lseg
->pls_seq
,
570 lseg
->pls_range
.offset
, lseg
->pls_range
.length
);
571 if (!mark_lseg_invalid(lseg
, tmp_list
))
574 dprintk("%s:Return %i\n", __func__
, remaining
);
578 /* note free_me must contain lsegs from a single layout_hdr */
580 pnfs_free_lseg_list(struct list_head
*free_me
)
582 struct pnfs_layout_segment
*lseg
, *tmp
;
584 if (list_empty(free_me
))
587 list_for_each_entry_safe(lseg
, tmp
, free_me
, pls_list
) {
588 list_del(&lseg
->pls_list
);
589 pnfs_free_lseg(lseg
);
594 pnfs_destroy_layout(struct nfs_inode
*nfsi
)
596 struct pnfs_layout_hdr
*lo
;
599 spin_lock(&nfsi
->vfs_inode
.i_lock
);
602 pnfs_get_layout_hdr(lo
);
603 pnfs_mark_layout_stateid_invalid(lo
, &tmp_list
);
604 pnfs_layout_clear_fail_bit(lo
, NFS_LAYOUT_RO_FAILED
);
605 pnfs_layout_clear_fail_bit(lo
, NFS_LAYOUT_RW_FAILED
);
606 spin_unlock(&nfsi
->vfs_inode
.i_lock
);
607 pnfs_free_lseg_list(&tmp_list
);
608 pnfs_put_layout_hdr(lo
);
610 spin_unlock(&nfsi
->vfs_inode
.i_lock
);
612 EXPORT_SYMBOL_GPL(pnfs_destroy_layout
);
615 pnfs_layout_add_bulk_destroy_list(struct inode
*inode
,
616 struct list_head
*layout_list
)
618 struct pnfs_layout_hdr
*lo
;
621 spin_lock(&inode
->i_lock
);
622 lo
= NFS_I(inode
)->layout
;
623 if (lo
!= NULL
&& list_empty(&lo
->plh_bulk_destroy
)) {
624 pnfs_get_layout_hdr(lo
);
625 list_add(&lo
->plh_bulk_destroy
, layout_list
);
628 spin_unlock(&inode
->i_lock
);
632 /* Caller must hold rcu_read_lock and clp->cl_lock */
634 pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client
*clp
,
635 struct nfs_server
*server
,
636 struct list_head
*layout_list
)
638 struct pnfs_layout_hdr
*lo
, *next
;
641 list_for_each_entry_safe(lo
, next
, &server
->layouts
, plh_layouts
) {
642 inode
= igrab(lo
->plh_inode
);
645 list_del_init(&lo
->plh_layouts
);
646 if (pnfs_layout_add_bulk_destroy_list(inode
, layout_list
))
649 spin_unlock(&clp
->cl_lock
);
651 spin_lock(&clp
->cl_lock
);
659 pnfs_layout_free_bulk_destroy_list(struct list_head
*layout_list
,
662 struct pnfs_layout_hdr
*lo
;
664 LIST_HEAD(lseg_list
);
667 while (!list_empty(layout_list
)) {
668 lo
= list_entry(layout_list
->next
, struct pnfs_layout_hdr
,
670 dprintk("%s freeing layout for inode %lu\n", __func__
,
671 lo
->plh_inode
->i_ino
);
672 inode
= lo
->plh_inode
;
674 pnfs_layoutcommit_inode(inode
, false);
676 spin_lock(&inode
->i_lock
);
677 list_del_init(&lo
->plh_bulk_destroy
);
678 if (pnfs_mark_layout_stateid_invalid(lo
, &lseg_list
)) {
680 set_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
);
683 spin_unlock(&inode
->i_lock
);
684 pnfs_free_lseg_list(&lseg_list
);
685 /* Free all lsegs that are attached to commit buckets */
686 nfs_commit_inode(inode
, 0);
687 pnfs_put_layout_hdr(lo
);
694 pnfs_destroy_layouts_byfsid(struct nfs_client
*clp
,
695 struct nfs_fsid
*fsid
,
698 struct nfs_server
*server
;
699 LIST_HEAD(layout_list
);
701 spin_lock(&clp
->cl_lock
);
704 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
705 if (memcmp(&server
->fsid
, fsid
, sizeof(*fsid
)) != 0)
707 if (pnfs_layout_bulk_destroy_byserver_locked(clp
,
713 spin_unlock(&clp
->cl_lock
);
715 if (list_empty(&layout_list
))
717 return pnfs_layout_free_bulk_destroy_list(&layout_list
, is_recall
);
721 pnfs_destroy_layouts_byclid(struct nfs_client
*clp
,
724 struct nfs_server
*server
;
725 LIST_HEAD(layout_list
);
727 spin_lock(&clp
->cl_lock
);
730 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
731 if (pnfs_layout_bulk_destroy_byserver_locked(clp
,
737 spin_unlock(&clp
->cl_lock
);
739 if (list_empty(&layout_list
))
741 return pnfs_layout_free_bulk_destroy_list(&layout_list
, is_recall
);
745 * Called by the state manger to remove all layouts established under an
749 pnfs_destroy_all_layouts(struct nfs_client
*clp
)
751 nfs4_deviceid_mark_client_invalid(clp
);
752 nfs4_deviceid_purge_client(clp
);
754 pnfs_destroy_layouts_byclid(clp
, false);
757 /* update lo->plh_stateid with new if is more recent */
759 pnfs_set_layout_stateid(struct pnfs_layout_hdr
*lo
, const nfs4_stateid
*new,
762 u32 oldseq
, newseq
, new_barrier
;
763 int empty
= list_empty(&lo
->plh_segs
);
765 oldseq
= be32_to_cpu(lo
->plh_stateid
.seqid
);
766 newseq
= be32_to_cpu(new->seqid
);
767 if (empty
|| pnfs_seqid_is_newer(newseq
, oldseq
)) {
768 nfs4_stateid_copy(&lo
->plh_stateid
, new);
769 if (update_barrier
) {
770 new_barrier
= be32_to_cpu(new->seqid
);
772 /* Because of wraparound, we want to keep the barrier
773 * "close" to the current seqids.
775 new_barrier
= newseq
- atomic_read(&lo
->plh_outstanding
);
777 if (empty
|| pnfs_seqid_is_newer(new_barrier
, lo
->plh_barrier
))
778 lo
->plh_barrier
= new_barrier
;
783 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr
*lo
,
784 const nfs4_stateid
*stateid
)
786 u32 seqid
= be32_to_cpu(stateid
->seqid
);
788 return !pnfs_seqid_is_newer(seqid
, lo
->plh_barrier
);
791 /* lget is set to 1 if called from inside send_layoutget call chain */
793 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr
*lo
)
795 return lo
->plh_block_lgets
||
796 test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
);
800 * Get layout from server.
801 * for now, assume that whole file layouts are requested.
803 * arg->length: all ones
805 static struct pnfs_layout_segment
*
806 send_layoutget(struct pnfs_layout_hdr
*lo
,
807 struct nfs_open_context
*ctx
,
808 nfs4_stateid
*stateid
,
809 const struct pnfs_layout_range
*range
,
810 long *timeout
, gfp_t gfp_flags
)
812 struct inode
*ino
= lo
->plh_inode
;
813 struct nfs_server
*server
= NFS_SERVER(ino
);
814 struct nfs4_layoutget
*lgp
;
817 dprintk("--> %s\n", __func__
);
820 * Synchronously retrieve layout information from server and
821 * store in lseg. If we race with a concurrent seqid morphing
822 * op, then re-send the LAYOUTGET.
824 lgp
= kzalloc(sizeof(*lgp
), gfp_flags
);
826 return ERR_PTR(-ENOMEM
);
828 i_size
= i_size_read(ino
);
830 lgp
->args
.minlength
= PAGE_SIZE
;
831 if (lgp
->args
.minlength
> range
->length
)
832 lgp
->args
.minlength
= range
->length
;
833 if (range
->iomode
== IOMODE_READ
) {
834 if (range
->offset
>= i_size
)
835 lgp
->args
.minlength
= 0;
836 else if (i_size
- range
->offset
< lgp
->args
.minlength
)
837 lgp
->args
.minlength
= i_size
- range
->offset
;
839 lgp
->args
.maxcount
= PNFS_LAYOUT_MAXSIZE
;
840 pnfs_copy_range(&lgp
->args
.range
, range
);
841 lgp
->args
.type
= server
->pnfs_curr_ld
->id
;
842 lgp
->args
.inode
= ino
;
843 lgp
->args
.ctx
= get_nfs_open_context(ctx
);
844 nfs4_stateid_copy(&lgp
->args
.stateid
, stateid
);
845 lgp
->gfp_flags
= gfp_flags
;
846 lgp
->cred
= lo
->plh_lc_cred
;
848 return nfs4_proc_layoutget(lgp
, timeout
, gfp_flags
);
851 static void pnfs_clear_layoutcommit(struct inode
*inode
,
852 struct list_head
*head
)
854 struct nfs_inode
*nfsi
= NFS_I(inode
);
855 struct pnfs_layout_segment
*lseg
, *tmp
;
857 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
))
859 list_for_each_entry_safe(lseg
, tmp
, &nfsi
->layout
->plh_segs
, pls_list
) {
860 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
))
862 pnfs_lseg_dec_and_remove_zero(lseg
, head
);
866 void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr
*lo
)
868 clear_bit_unlock(NFS_LAYOUT_RETURN
, &lo
->plh_flags
);
869 smp_mb__after_atomic();
870 wake_up_bit(&lo
->plh_flags
, NFS_LAYOUT_RETURN
);
871 rpc_wake_up(&NFS_SERVER(lo
->plh_inode
)->roc_rpcwaitq
);
875 pnfs_prepare_layoutreturn(struct pnfs_layout_hdr
*lo
)
877 if (test_and_set_bit(NFS_LAYOUT_RETURN
, &lo
->plh_flags
))
879 lo
->plh_return_iomode
= 0;
880 lo
->plh_return_seq
= 0;
881 pnfs_get_layout_hdr(lo
);
882 clear_bit(NFS_LAYOUT_RETURN_REQUESTED
, &lo
->plh_flags
);
887 pnfs_send_layoutreturn(struct pnfs_layout_hdr
*lo
, const nfs4_stateid
*stateid
,
888 enum pnfs_iomode iomode
, bool sync
)
890 struct inode
*ino
= lo
->plh_inode
;
891 struct nfs4_layoutreturn
*lrp
;
894 lrp
= kzalloc(sizeof(*lrp
), GFP_NOFS
);
895 if (unlikely(lrp
== NULL
)) {
897 spin_lock(&ino
->i_lock
);
898 pnfs_clear_layoutreturn_waitbit(lo
);
899 spin_unlock(&ino
->i_lock
);
900 pnfs_put_layout_hdr(lo
);
904 nfs4_stateid_copy(&lrp
->args
.stateid
, stateid
);
905 lrp
->args
.layout_type
= NFS_SERVER(ino
)->pnfs_curr_ld
->id
;
906 lrp
->args
.inode
= ino
;
907 lrp
->args
.range
.iomode
= iomode
;
908 lrp
->args
.range
.offset
= 0;
909 lrp
->args
.range
.length
= NFS4_MAX_UINT64
;
910 lrp
->args
.layout
= lo
;
911 lrp
->clp
= NFS_SERVER(ino
)->nfs_client
;
912 lrp
->cred
= lo
->plh_lc_cred
;
914 status
= nfs4_proc_layoutreturn(lrp
, sync
);
916 dprintk("<-- %s status: %d\n", __func__
, status
);
920 /* Return true if layoutreturn is needed */
922 pnfs_layout_need_return(struct pnfs_layout_hdr
*lo
)
924 struct pnfs_layout_segment
*s
;
926 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED
, &lo
->plh_flags
))
929 /* Defer layoutreturn until all lsegs are done */
930 list_for_each_entry(s
, &lo
->plh_segs
, pls_list
) {
931 if (test_bit(NFS_LSEG_LAYOUTRETURN
, &s
->pls_flags
))
938 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr
*lo
)
940 struct inode
*inode
= lo
->plh_inode
;
942 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED
, &lo
->plh_flags
))
944 spin_lock(&inode
->i_lock
);
945 if (pnfs_layout_need_return(lo
)) {
946 nfs4_stateid stateid
;
947 enum pnfs_iomode iomode
;
950 nfs4_stateid_copy(&stateid
, &lo
->plh_stateid
);
951 stateid
.seqid
= cpu_to_be32(lo
->plh_return_seq
);
952 iomode
= lo
->plh_return_iomode
;
953 send
= pnfs_prepare_layoutreturn(lo
);
954 spin_unlock(&inode
->i_lock
);
956 /* Send an async layoutreturn so we dont deadlock */
957 pnfs_send_layoutreturn(lo
, &stateid
, iomode
, false);
960 spin_unlock(&inode
->i_lock
);
964 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
965 * when the layout segment list is empty.
967 * Note that a pnfs_layout_hdr can exist with an empty layout segment
968 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
969 * deviceid is marked invalid.
972 _pnfs_return_layout(struct inode
*ino
)
974 struct pnfs_layout_hdr
*lo
= NULL
;
975 struct nfs_inode
*nfsi
= NFS_I(ino
);
977 nfs4_stateid stateid
;
978 int status
= 0, empty
;
981 dprintk("NFS: %s for inode %lu\n", __func__
, ino
->i_ino
);
983 spin_lock(&ino
->i_lock
);
986 spin_unlock(&ino
->i_lock
);
987 dprintk("NFS: %s no layout to return\n", __func__
);
990 nfs4_stateid_copy(&stateid
, &nfsi
->layout
->plh_stateid
);
991 /* Reference matched in nfs4_layoutreturn_release */
992 pnfs_get_layout_hdr(lo
);
993 empty
= list_empty(&lo
->plh_segs
);
994 pnfs_clear_layoutcommit(ino
, &tmp_list
);
995 pnfs_mark_matching_lsegs_invalid(lo
, &tmp_list
, NULL
, 0);
997 if (NFS_SERVER(ino
)->pnfs_curr_ld
->return_range
) {
998 struct pnfs_layout_range range
= {
999 .iomode
= IOMODE_ANY
,
1001 .length
= NFS4_MAX_UINT64
,
1003 NFS_SERVER(ino
)->pnfs_curr_ld
->return_range(lo
, &range
);
1006 /* Don't send a LAYOUTRETURN if list was initially empty */
1008 spin_unlock(&ino
->i_lock
);
1009 dprintk("NFS: %s no layout segments to return\n", __func__
);
1010 goto out_put_layout_hdr
;
1013 set_bit(NFS_LAYOUT_INVALID_STID
, &lo
->plh_flags
);
1014 send
= pnfs_prepare_layoutreturn(lo
);
1015 spin_unlock(&ino
->i_lock
);
1016 pnfs_free_lseg_list(&tmp_list
);
1018 status
= pnfs_send_layoutreturn(lo
, &stateid
, IOMODE_ANY
, true);
1020 pnfs_put_layout_hdr(lo
);
1022 dprintk("<-- %s status: %d\n", __func__
, status
);
1025 EXPORT_SYMBOL_GPL(_pnfs_return_layout
);
1028 pnfs_commit_and_return_layout(struct inode
*inode
)
1030 struct pnfs_layout_hdr
*lo
;
1033 spin_lock(&inode
->i_lock
);
1034 lo
= NFS_I(inode
)->layout
;
1036 spin_unlock(&inode
->i_lock
);
1039 pnfs_get_layout_hdr(lo
);
1040 /* Block new layoutgets and read/write to ds */
1041 lo
->plh_block_lgets
++;
1042 spin_unlock(&inode
->i_lock
);
1043 filemap_fdatawait(inode
->i_mapping
);
1044 ret
= pnfs_layoutcommit_inode(inode
, true);
1046 ret
= _pnfs_return_layout(inode
);
1047 spin_lock(&inode
->i_lock
);
1048 lo
->plh_block_lgets
--;
1049 spin_unlock(&inode
->i_lock
);
1050 pnfs_put_layout_hdr(lo
);
1054 bool pnfs_roc(struct inode
*ino
)
1056 struct nfs_inode
*nfsi
= NFS_I(ino
);
1057 struct nfs_open_context
*ctx
;
1058 struct nfs4_state
*state
;
1059 struct pnfs_layout_hdr
*lo
;
1060 struct pnfs_layout_segment
*lseg
, *tmp
;
1061 nfs4_stateid stateid
;
1062 LIST_HEAD(tmp_list
);
1063 bool found
= false, layoutreturn
= false, roc
= false;
1065 spin_lock(&ino
->i_lock
);
1067 if (!lo
|| test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
))
1070 /* no roc if we hold a delegation */
1071 if (nfs4_check_delegation(ino
, FMODE_READ
))
1074 list_for_each_entry(ctx
, &nfsi
->open_files
, list
) {
1076 /* Don't return layout if there is open file state */
1077 if (state
!= NULL
&& state
->state
!= 0)
1081 nfs4_stateid_copy(&stateid
, &lo
->plh_stateid
);
1082 /* always send layoutreturn if being marked so */
1083 if (test_and_clear_bit(NFS_LAYOUT_RETURN_REQUESTED
,
1085 layoutreturn
= pnfs_prepare_layoutreturn(lo
);
1087 list_for_each_entry_safe(lseg
, tmp
, &lo
->plh_segs
, pls_list
)
1088 /* If we are sending layoutreturn, invalidate all valid lsegs */
1089 if (layoutreturn
|| test_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
)) {
1090 mark_lseg_invalid(lseg
, &tmp_list
);
1093 /* ROC in two conditions:
1094 * 1. there are ROC lsegs
1095 * 2. we don't send layoutreturn
1097 if (found
&& !layoutreturn
) {
1098 /* lo ref dropped in pnfs_roc_release() */
1099 pnfs_get_layout_hdr(lo
);
1104 spin_unlock(&ino
->i_lock
);
1105 pnfs_free_lseg_list(&tmp_list
);
1106 pnfs_layoutcommit_inode(ino
, true);
1108 pnfs_send_layoutreturn(lo
, &stateid
, IOMODE_ANY
, true);
1112 void pnfs_roc_release(struct inode
*ino
)
1114 struct pnfs_layout_hdr
*lo
;
1116 spin_lock(&ino
->i_lock
);
1117 lo
= NFS_I(ino
)->layout
;
1118 pnfs_clear_layoutreturn_waitbit(lo
);
1119 if (atomic_dec_and_test(&lo
->plh_refcount
)) {
1120 pnfs_detach_layout_hdr(lo
);
1121 spin_unlock(&ino
->i_lock
);
1122 pnfs_free_layout_hdr(lo
);
1124 spin_unlock(&ino
->i_lock
);
1127 void pnfs_roc_set_barrier(struct inode
*ino
, u32 barrier
)
1129 struct pnfs_layout_hdr
*lo
;
1131 spin_lock(&ino
->i_lock
);
1132 lo
= NFS_I(ino
)->layout
;
1133 pnfs_mark_layout_returned_if_empty(lo
);
1134 if (pnfs_seqid_is_newer(barrier
, lo
->plh_barrier
))
1135 lo
->plh_barrier
= barrier
;
1136 spin_unlock(&ino
->i_lock
);
1137 trace_nfs4_layoutreturn_on_close(ino
, 0);
1140 void pnfs_roc_get_barrier(struct inode
*ino
, u32
*barrier
)
1142 struct nfs_inode
*nfsi
= NFS_I(ino
);
1143 struct pnfs_layout_hdr
*lo
;
1146 spin_lock(&ino
->i_lock
);
1148 current_seqid
= be32_to_cpu(lo
->plh_stateid
.seqid
);
1150 /* Since close does not return a layout stateid for use as
1151 * a barrier, we choose the worst-case barrier.
1153 *barrier
= current_seqid
+ atomic_read(&lo
->plh_outstanding
);
1154 spin_unlock(&ino
->i_lock
);
1157 bool pnfs_wait_on_layoutreturn(struct inode
*ino
, struct rpc_task
*task
)
1159 struct nfs_inode
*nfsi
= NFS_I(ino
);
1160 struct pnfs_layout_hdr
*lo
;
1163 /* we might not have grabbed lo reference. so need to check under
1165 spin_lock(&ino
->i_lock
);
1167 if (lo
&& test_bit(NFS_LAYOUT_RETURN
, &lo
->plh_flags
))
1169 spin_unlock(&ino
->i_lock
);
1172 rpc_sleep_on(&NFS_SERVER(ino
)->roc_rpcwaitq
, task
, NULL
);
1178 * Compare two layout segments for sorting into layout cache.
1179 * We want to preferentially return RW over RO layouts, so ensure those
1183 pnfs_lseg_range_cmp(const struct pnfs_layout_range
*l1
,
1184 const struct pnfs_layout_range
*l2
)
1188 /* high offset > low offset */
1189 d
= l1
->offset
- l2
->offset
;
1193 /* short length > long length */
1194 d
= l2
->length
- l1
->length
;
1198 /* read > read/write */
1199 return (int)(l1
->iomode
== IOMODE_READ
) - (int)(l2
->iomode
== IOMODE_READ
);
1203 pnfs_lseg_range_is_after(const struct pnfs_layout_range
*l1
,
1204 const struct pnfs_layout_range
*l2
)
1206 return pnfs_lseg_range_cmp(l1
, l2
) > 0;
1210 pnfs_lseg_no_merge(struct pnfs_layout_segment
*lseg
,
1211 struct pnfs_layout_segment
*old
)
1217 pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr
*lo
,
1218 struct pnfs_layout_segment
*lseg
,
1219 bool (*is_after
)(const struct pnfs_layout_range
*,
1220 const struct pnfs_layout_range
*),
1221 bool (*do_merge
)(struct pnfs_layout_segment
*,
1222 struct pnfs_layout_segment
*),
1223 struct list_head
*free_me
)
1225 struct pnfs_layout_segment
*lp
, *tmp
;
1227 dprintk("%s:Begin\n", __func__
);
1229 list_for_each_entry_safe(lp
, tmp
, &lo
->plh_segs
, pls_list
) {
1230 if (test_bit(NFS_LSEG_VALID
, &lp
->pls_flags
) == 0)
1232 if (do_merge(lseg
, lp
)) {
1233 mark_lseg_invalid(lp
, free_me
);
1236 if (is_after(&lseg
->pls_range
, &lp
->pls_range
))
1238 list_add_tail(&lseg
->pls_list
, &lp
->pls_list
);
1239 dprintk("%s: inserted lseg %p "
1240 "iomode %d offset %llu length %llu before "
1241 "lp %p iomode %d offset %llu length %llu\n",
1242 __func__
, lseg
, lseg
->pls_range
.iomode
,
1243 lseg
->pls_range
.offset
, lseg
->pls_range
.length
,
1244 lp
, lp
->pls_range
.iomode
, lp
->pls_range
.offset
,
1245 lp
->pls_range
.length
);
1248 list_add_tail(&lseg
->pls_list
, &lo
->plh_segs
);
1249 dprintk("%s: inserted lseg %p "
1250 "iomode %d offset %llu length %llu at tail\n",
1251 __func__
, lseg
, lseg
->pls_range
.iomode
,
1252 lseg
->pls_range
.offset
, lseg
->pls_range
.length
);
1254 pnfs_get_layout_hdr(lo
);
1256 dprintk("%s:Return\n", __func__
);
1258 EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg
);
1261 pnfs_layout_insert_lseg(struct pnfs_layout_hdr
*lo
,
1262 struct pnfs_layout_segment
*lseg
,
1263 struct list_head
*free_me
)
1265 struct inode
*inode
= lo
->plh_inode
;
1266 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(inode
)->pnfs_curr_ld
;
1268 if (ld
->add_lseg
!= NULL
)
1269 ld
->add_lseg(lo
, lseg
, free_me
);
1271 pnfs_generic_layout_insert_lseg(lo
, lseg
,
1272 pnfs_lseg_range_is_after
,
1277 static struct pnfs_layout_hdr
*
1278 alloc_init_layout_hdr(struct inode
*ino
,
1279 struct nfs_open_context
*ctx
,
1282 struct pnfs_layout_hdr
*lo
;
1284 lo
= pnfs_alloc_layout_hdr(ino
, gfp_flags
);
1287 atomic_set(&lo
->plh_refcount
, 1);
1288 INIT_LIST_HEAD(&lo
->plh_layouts
);
1289 INIT_LIST_HEAD(&lo
->plh_segs
);
1290 INIT_LIST_HEAD(&lo
->plh_bulk_destroy
);
1291 lo
->plh_inode
= ino
;
1292 lo
->plh_lc_cred
= get_rpccred(ctx
->cred
);
1296 static struct pnfs_layout_hdr
*
1297 pnfs_find_alloc_layout(struct inode
*ino
,
1298 struct nfs_open_context
*ctx
,
1301 struct nfs_inode
*nfsi
= NFS_I(ino
);
1302 struct pnfs_layout_hdr
*new = NULL
;
1304 dprintk("%s Begin ino=%p layout=%p\n", __func__
, ino
, nfsi
->layout
);
1306 if (nfsi
->layout
!= NULL
)
1308 spin_unlock(&ino
->i_lock
);
1309 new = alloc_init_layout_hdr(ino
, ctx
, gfp_flags
);
1310 spin_lock(&ino
->i_lock
);
1312 if (likely(nfsi
->layout
== NULL
)) { /* Won the race? */
1315 } else if (new != NULL
)
1316 pnfs_free_layout_hdr(new);
1318 pnfs_get_layout_hdr(nfsi
->layout
);
1319 return nfsi
->layout
;
1323 * iomode matching rules:
1324 * iomode lseg strict match
1326 * ----- ----- ------ -----
1331 * READ READ N/A true
1332 * READ RW true false
1333 * READ RW false true
1336 pnfs_lseg_range_match(const struct pnfs_layout_range
*ls_range
,
1337 const struct pnfs_layout_range
*range
,
1340 struct pnfs_layout_range range1
;
1342 if ((range
->iomode
== IOMODE_RW
&&
1343 ls_range
->iomode
!= IOMODE_RW
) ||
1344 (range
->iomode
!= ls_range
->iomode
&&
1345 strict_iomode
== true) ||
1346 !pnfs_lseg_range_intersecting(ls_range
, range
))
1349 /* range1 covers only the first byte in the range */
1352 return pnfs_lseg_range_contained(ls_range
, &range1
);
1356 * lookup range in layout
1358 static struct pnfs_layout_segment
*
1359 pnfs_find_lseg(struct pnfs_layout_hdr
*lo
,
1360 struct pnfs_layout_range
*range
,
1363 struct pnfs_layout_segment
*lseg
, *ret
= NULL
;
1365 dprintk("%s:Begin\n", __func__
);
1367 list_for_each_entry(lseg
, &lo
->plh_segs
, pls_list
) {
1368 if (test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
) &&
1369 !test_bit(NFS_LSEG_LAYOUTRETURN
, &lseg
->pls_flags
) &&
1370 pnfs_lseg_range_match(&lseg
->pls_range
, range
,
1372 ret
= pnfs_get_lseg(lseg
);
1377 dprintk("%s:Return lseg %p ref %d\n",
1378 __func__
, ret
, ret
? atomic_read(&ret
->pls_refcount
) : 0);
1383 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1384 * to the MDS or over pNFS
1386 * The nfs_inode read_io and write_io fields are cumulative counters reset
1387 * when there are no layout segments. Note that in pnfs_update_layout iomode
1388 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1391 * A return of true means use MDS I/O.
1394 * If a file's size is smaller than the file size threshold, data accesses
1395 * SHOULD be sent to the metadata server. If an I/O request has a length that
1396 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1397 * server. If both file size and I/O size are provided, the client SHOULD
1398 * reach or exceed both thresholds before sending its read or write
1399 * requests to the data server.
1401 static bool pnfs_within_mdsthreshold(struct nfs_open_context
*ctx
,
1402 struct inode
*ino
, int iomode
)
1404 struct nfs4_threshold
*t
= ctx
->mdsthreshold
;
1405 struct nfs_inode
*nfsi
= NFS_I(ino
);
1406 loff_t fsize
= i_size_read(ino
);
1407 bool size
= false, size_set
= false, io
= false, io_set
= false, ret
= false;
1412 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1413 __func__
, t
->bm
, t
->rd_sz
, t
->wr_sz
, t
->rd_io_sz
, t
->wr_io_sz
);
1417 if (t
->bm
& THRESHOLD_RD
) {
1418 dprintk("%s fsize %llu\n", __func__
, fsize
);
1420 if (fsize
< t
->rd_sz
)
1423 if (t
->bm
& THRESHOLD_RD_IO
) {
1424 dprintk("%s nfsi->read_io %llu\n", __func__
,
1427 if (nfsi
->read_io
< t
->rd_io_sz
)
1432 if (t
->bm
& THRESHOLD_WR
) {
1433 dprintk("%s fsize %llu\n", __func__
, fsize
);
1435 if (fsize
< t
->wr_sz
)
1438 if (t
->bm
& THRESHOLD_WR_IO
) {
1439 dprintk("%s nfsi->write_io %llu\n", __func__
,
1442 if (nfsi
->write_io
< t
->wr_io_sz
)
1447 if (size_set
&& io_set
) {
1450 } else if (size
|| io
)
1453 dprintk("<-- %s size %d io %d ret %d\n", __func__
, size
, io
, ret
);
1457 static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr
*lo
)
1460 * send layoutcommit as it can hold up layoutreturn due to lseg
1463 pnfs_layoutcommit_inode(lo
->plh_inode
, false);
1464 return !wait_on_bit_action(&lo
->plh_flags
, NFS_LAYOUT_RETURN
,
1465 nfs_wait_bit_killable
,
1466 TASK_UNINTERRUPTIBLE
);
1469 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr
*lo
)
1471 unsigned long *bitlock
= &lo
->plh_flags
;
1473 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET
, bitlock
);
1474 smp_mb__after_atomic();
1475 wake_up_bit(bitlock
, NFS_LAYOUT_FIRST_LAYOUTGET
);
1479 * Layout segment is retreived from the server if not cached.
1480 * The appropriate layout segment is referenced and returned to the caller.
1482 struct pnfs_layout_segment
*
1483 pnfs_update_layout(struct inode
*ino
,
1484 struct nfs_open_context
*ctx
,
1487 enum pnfs_iomode iomode
,
1491 struct pnfs_layout_range arg
= {
1496 unsigned pg_offset
, seq
;
1497 struct nfs_server
*server
= NFS_SERVER(ino
);
1498 struct nfs_client
*clp
= server
->nfs_client
;
1499 struct pnfs_layout_hdr
*lo
= NULL
;
1500 struct pnfs_layout_segment
*lseg
= NULL
;
1501 nfs4_stateid stateid
;
1503 unsigned long giveup
= jiffies
+ rpc_get_timeout(server
->client
);
1506 if (!pnfs_enabled_sb(NFS_SERVER(ino
))) {
1507 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1508 PNFS_UPDATE_LAYOUT_NO_PNFS
);
1512 if (iomode
== IOMODE_READ
&& i_size_read(ino
) == 0) {
1513 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1514 PNFS_UPDATE_LAYOUT_RD_ZEROLEN
);
1518 if (pnfs_within_mdsthreshold(ctx
, ino
, iomode
)) {
1519 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1520 PNFS_UPDATE_LAYOUT_MDSTHRESH
);
1526 spin_lock(&ino
->i_lock
);
1527 lo
= pnfs_find_alloc_layout(ino
, ctx
, gfp_flags
);
1529 spin_unlock(&ino
->i_lock
);
1530 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1531 PNFS_UPDATE_LAYOUT_NOMEM
);
1535 /* Do we even need to bother with this? */
1536 if (test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
)) {
1537 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1538 PNFS_UPDATE_LAYOUT_BULK_RECALL
);
1539 dprintk("%s matches recall, use MDS\n", __func__
);
1543 /* if LAYOUTGET already failed once we don't try again */
1544 if (pnfs_layout_io_test_failed(lo
, iomode
)) {
1545 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1546 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL
);
1550 lseg
= pnfs_find_lseg(lo
, &arg
, strict_iomode
);
1552 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1553 PNFS_UPDATE_LAYOUT_FOUND_CACHED
);
1557 if (!nfs4_valid_open_stateid(ctx
->state
)) {
1558 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1559 PNFS_UPDATE_LAYOUT_INVALID_OPEN
);
1564 * Choose a stateid for the LAYOUTGET. If we don't have a layout
1565 * stateid, or it has been invalidated, then we must use the open
1568 if (lo
->plh_stateid
.seqid
== 0 ||
1569 test_bit(NFS_LAYOUT_INVALID_STID
, &lo
->plh_flags
)) {
1572 * The first layoutget for the file. Need to serialize per
1573 * RFC 5661 Errata 3208.
1575 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET
,
1577 spin_unlock(&ino
->i_lock
);
1578 wait_on_bit(&lo
->plh_flags
, NFS_LAYOUT_FIRST_LAYOUTGET
,
1579 TASK_UNINTERRUPTIBLE
);
1580 pnfs_put_layout_hdr(lo
);
1581 dprintk("%s retrying\n", __func__
);
1587 seq
= read_seqbegin(&ctx
->state
->seqlock
);
1588 nfs4_stateid_copy(&stateid
, &ctx
->state
->stateid
);
1589 } while (read_seqretry(&ctx
->state
->seqlock
, seq
));
1591 nfs4_stateid_copy(&stateid
, &lo
->plh_stateid
);
1595 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
1596 * for LAYOUTRETURN even if first is true.
1598 if (test_bit(NFS_LAYOUT_RETURN
, &lo
->plh_flags
)) {
1599 spin_unlock(&ino
->i_lock
);
1600 dprintk("%s wait for layoutreturn\n", __func__
);
1601 if (pnfs_prepare_to_retry_layoutget(lo
)) {
1603 pnfs_clear_first_layoutget(lo
);
1604 pnfs_put_layout_hdr(lo
);
1605 dprintk("%s retrying\n", __func__
);
1606 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
,
1607 lseg
, PNFS_UPDATE_LAYOUT_RETRY
);
1610 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1611 PNFS_UPDATE_LAYOUT_RETURN
);
1612 goto out_put_layout_hdr
;
1615 if (pnfs_layoutgets_blocked(lo
)) {
1616 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1617 PNFS_UPDATE_LAYOUT_BLOCKED
);
1620 atomic_inc(&lo
->plh_outstanding
);
1621 spin_unlock(&ino
->i_lock
);
1623 if (list_empty(&lo
->plh_layouts
)) {
1624 /* The lo must be on the clp list if there is any
1625 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1627 spin_lock(&clp
->cl_lock
);
1628 if (list_empty(&lo
->plh_layouts
))
1629 list_add_tail(&lo
->plh_layouts
, &server
->layouts
);
1630 spin_unlock(&clp
->cl_lock
);
1633 pg_offset
= arg
.offset
& ~PAGE_MASK
;
1635 arg
.offset
-= pg_offset
;
1636 arg
.length
+= pg_offset
;
1638 if (arg
.length
!= NFS4_MAX_UINT64
)
1639 arg
.length
= PAGE_ALIGN(arg
.length
);
1641 lseg
= send_layoutget(lo
, ctx
, &stateid
, &arg
, &timeout
, gfp_flags
);
1642 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
, lseg
,
1643 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET
);
1645 switch(PTR_ERR(lseg
)) {
1646 case -ERECALLCONFLICT
:
1647 if (time_after(jiffies
, giveup
))
1651 pnfs_put_layout_hdr(lo
);
1653 pnfs_clear_first_layoutget(lo
);
1655 trace_pnfs_update_layout(ino
, pos
, count
,
1656 iomode
, lo
, lseg
, PNFS_UPDATE_LAYOUT_RETRY
);
1661 if (!nfs_error_is_fatal(PTR_ERR(lseg
))) {
1662 pnfs_layout_clear_fail_bit(lo
, pnfs_iomode_to_fail_bit(iomode
));
1667 pnfs_layout_clear_fail_bit(lo
, pnfs_iomode_to_fail_bit(iomode
));
1670 atomic_dec(&lo
->plh_outstanding
);
1673 pnfs_clear_first_layoutget(lo
);
1674 pnfs_put_layout_hdr(lo
);
1676 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1677 "(%s, offset: %llu, length: %llu)\n",
1678 __func__
, ino
->i_sb
->s_id
,
1679 (unsigned long long)NFS_FILEID(ino
),
1680 IS_ERR_OR_NULL(lseg
) ? "not found" : "found",
1681 iomode
==IOMODE_RW
? "read/write" : "read-only",
1682 (unsigned long long)pos
,
1683 (unsigned long long)count
);
1686 spin_unlock(&ino
->i_lock
);
1687 goto out_put_layout_hdr
;
1689 EXPORT_SYMBOL_GPL(pnfs_update_layout
);
1692 pnfs_sanity_check_layout_range(struct pnfs_layout_range
*range
)
1694 switch (range
->iomode
) {
1701 if (range
->offset
== NFS4_MAX_UINT64
)
1703 if (range
->length
== 0)
1705 if (range
->length
!= NFS4_MAX_UINT64
&&
1706 range
->length
> NFS4_MAX_UINT64
- range
->offset
)
1711 struct pnfs_layout_segment
*
1712 pnfs_layout_process(struct nfs4_layoutget
*lgp
)
1714 struct pnfs_layout_hdr
*lo
= NFS_I(lgp
->args
.inode
)->layout
;
1715 struct nfs4_layoutget_res
*res
= &lgp
->res
;
1716 struct pnfs_layout_segment
*lseg
;
1717 struct inode
*ino
= lo
->plh_inode
;
1720 if (!pnfs_sanity_check_layout_range(&res
->range
))
1721 return ERR_PTR(-EINVAL
);
1723 /* Inject layout blob into I/O device driver */
1724 lseg
= NFS_SERVER(ino
)->pnfs_curr_ld
->alloc_lseg(lo
, res
, lgp
->gfp_flags
);
1725 if (IS_ERR_OR_NULL(lseg
)) {
1727 lseg
= ERR_PTR(-ENOMEM
);
1729 dprintk("%s: Could not allocate layout: error %ld\n",
1730 __func__
, PTR_ERR(lseg
));
1734 init_lseg(lo
, lseg
);
1735 lseg
->pls_range
= res
->range
;
1736 lseg
->pls_seq
= be32_to_cpu(res
->stateid
.seqid
);
1738 spin_lock(&ino
->i_lock
);
1739 if (pnfs_layoutgets_blocked(lo
)) {
1740 dprintk("%s forget reply due to state\n", __func__
);
1744 if (nfs4_stateid_match_other(&lo
->plh_stateid
, &res
->stateid
)) {
1745 /* existing state ID, make sure the sequence number matches. */
1746 if (pnfs_layout_stateid_blocked(lo
, &res
->stateid
)) {
1747 dprintk("%s forget reply due to sequence\n", __func__
);
1750 pnfs_set_layout_stateid(lo
, &res
->stateid
, false);
1753 * We got an entirely new state ID. Mark all segments for the
1754 * inode invalid, and don't bother validating the stateid
1757 pnfs_mark_matching_lsegs_invalid(lo
, &free_me
, NULL
, 0);
1759 nfs4_stateid_copy(&lo
->plh_stateid
, &res
->stateid
);
1760 lo
->plh_barrier
= be32_to_cpu(res
->stateid
.seqid
);
1763 clear_bit(NFS_LAYOUT_INVALID_STID
, &lo
->plh_flags
);
1765 pnfs_get_lseg(lseg
);
1766 pnfs_layout_insert_lseg(lo
, lseg
, &free_me
);
1768 if (res
->return_on_close
)
1769 set_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
);
1771 spin_unlock(&ino
->i_lock
);
1772 pnfs_free_lseg_list(&free_me
);
1776 spin_unlock(&ino
->i_lock
);
1777 lseg
->pls_layout
= lo
;
1778 NFS_SERVER(ino
)->pnfs_curr_ld
->free_lseg(lseg
);
1779 return ERR_PTR(-EAGAIN
);
1783 pnfs_set_plh_return_info(struct pnfs_layout_hdr
*lo
, enum pnfs_iomode iomode
,
1786 if (lo
->plh_return_iomode
== iomode
)
1788 if (lo
->plh_return_iomode
!= 0)
1789 iomode
= IOMODE_ANY
;
1790 lo
->plh_return_iomode
= iomode
;
1791 set_bit(NFS_LAYOUT_RETURN_REQUESTED
, &lo
->plh_flags
);
1792 if (!lo
->plh_return_seq
|| pnfs_seqid_is_newer(seq
, lo
->plh_return_seq
))
1793 lo
->plh_return_seq
= seq
;
1797 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
1798 * @lo: pointer to layout header
1799 * @tmp_list: list header to be used with pnfs_free_lseg_list()
1800 * @return_range: describe layout segment ranges to be returned
1802 * This function is mainly intended for use by layoutrecall. It attempts
1803 * to free the layout segment immediately, or else to mark it for return
1804 * as soon as its reference count drops to zero.
1807 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr
*lo
,
1808 struct list_head
*tmp_list
,
1809 const struct pnfs_layout_range
*return_range
,
1812 struct pnfs_layout_segment
*lseg
, *next
;
1815 dprintk("%s:Begin lo %p\n", __func__
, lo
);
1817 if (list_empty(&lo
->plh_segs
))
1820 assert_spin_locked(&lo
->plh_inode
->i_lock
);
1822 list_for_each_entry_safe(lseg
, next
, &lo
->plh_segs
, pls_list
)
1823 if (should_free_lseg(&lseg
->pls_range
, return_range
)) {
1824 dprintk("%s: marking lseg %p iomode %d "
1825 "offset %llu length %llu\n", __func__
,
1826 lseg
, lseg
->pls_range
.iomode
,
1827 lseg
->pls_range
.offset
,
1828 lseg
->pls_range
.length
);
1829 if (mark_lseg_invalid(lseg
, tmp_list
))
1832 set_bit(NFS_LSEG_LAYOUTRETURN
, &lseg
->pls_flags
);
1836 pnfs_set_plh_return_info(lo
, return_range
->iomode
, seq
);
1841 void pnfs_error_mark_layout_for_return(struct inode
*inode
,
1842 struct pnfs_layout_segment
*lseg
)
1844 struct pnfs_layout_hdr
*lo
= NFS_I(inode
)->layout
;
1845 struct pnfs_layout_range range
= {
1846 .iomode
= lseg
->pls_range
.iomode
,
1848 .length
= NFS4_MAX_UINT64
,
1851 bool return_now
= false;
1853 spin_lock(&inode
->i_lock
);
1854 pnfs_set_plh_return_info(lo
, range
.iomode
, lseg
->pls_seq
);
1856 * mark all matching lsegs so that we are sure to have no live
1857 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
1860 if (!pnfs_mark_matching_lsegs_return(lo
, &free_me
,
1861 &range
, lseg
->pls_seq
)) {
1862 nfs4_stateid stateid
;
1863 enum pnfs_iomode iomode
= lo
->plh_return_iomode
;
1865 nfs4_stateid_copy(&stateid
, &lo
->plh_stateid
);
1866 return_now
= pnfs_prepare_layoutreturn(lo
);
1867 spin_unlock(&inode
->i_lock
);
1869 pnfs_send_layoutreturn(lo
, &stateid
, iomode
, false);
1871 spin_unlock(&inode
->i_lock
);
1872 nfs_commit_inode(inode
, 0);
1874 pnfs_free_lseg_list(&free_me
);
1876 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return
);
1879 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*req
)
1881 u64 rd_size
= req
->wb_bytes
;
1883 if (pgio
->pg_lseg
== NULL
) {
1884 if (pgio
->pg_dreq
== NULL
)
1885 rd_size
= i_size_read(pgio
->pg_inode
) - req_offset(req
);
1887 rd_size
= nfs_dreq_bytes_left(pgio
->pg_dreq
);
1889 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
1896 if (IS_ERR(pgio
->pg_lseg
)) {
1897 pgio
->pg_error
= PTR_ERR(pgio
->pg_lseg
);
1898 pgio
->pg_lseg
= NULL
;
1902 /* If no lseg, fall back to read through mds */
1903 if (pgio
->pg_lseg
== NULL
)
1904 nfs_pageio_reset_read_mds(pgio
);
1907 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read
);
1910 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor
*pgio
,
1911 struct nfs_page
*req
, u64 wb_size
)
1913 if (pgio
->pg_lseg
== NULL
) {
1914 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
1921 if (IS_ERR(pgio
->pg_lseg
)) {
1922 pgio
->pg_error
= PTR_ERR(pgio
->pg_lseg
);
1923 pgio
->pg_lseg
= NULL
;
1927 /* If no lseg, fall back to write through mds */
1928 if (pgio
->pg_lseg
== NULL
)
1929 nfs_pageio_reset_write_mds(pgio
);
1931 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write
);
1934 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor
*desc
)
1936 if (desc
->pg_lseg
) {
1937 pnfs_put_lseg(desc
->pg_lseg
);
1938 desc
->pg_lseg
= NULL
;
1941 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup
);
1944 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
1945 * of bytes (maximum @req->wb_bytes) that can be coalesced.
1948 pnfs_generic_pg_test(struct nfs_pageio_descriptor
*pgio
,
1949 struct nfs_page
*prev
, struct nfs_page
*req
)
1952 u64 seg_end
, req_start
, seg_left
;
1954 size
= nfs_generic_pg_test(pgio
, prev
, req
);
1959 * 'size' contains the number of bytes left in the current page (up
1960 * to the original size asked for in @req->wb_bytes).
1962 * Calculate how many bytes are left in the layout segment
1963 * and if there are less bytes than 'size', return that instead.
1965 * Please also note that 'end_offset' is actually the offset of the
1966 * first byte that lies outside the pnfs_layout_range. FIXME?
1969 if (pgio
->pg_lseg
) {
1970 seg_end
= end_offset(pgio
->pg_lseg
->pls_range
.offset
,
1971 pgio
->pg_lseg
->pls_range
.length
);
1972 req_start
= req_offset(req
);
1973 WARN_ON_ONCE(req_start
>= seg_end
);
1974 /* start of request is past the last byte of this segment */
1975 if (req_start
>= seg_end
) {
1976 /* reference the new lseg */
1977 if (pgio
->pg_ops
->pg_cleanup
)
1978 pgio
->pg_ops
->pg_cleanup(pgio
);
1979 if (pgio
->pg_ops
->pg_init
)
1980 pgio
->pg_ops
->pg_init(pgio
, req
);
1984 /* adjust 'size' iff there are fewer bytes left in the
1985 * segment than what nfs_generic_pg_test returned */
1986 seg_left
= seg_end
- req_start
;
1987 if (seg_left
< size
)
1988 size
= (unsigned int)seg_left
;
1993 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test
);
1995 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header
*hdr
)
1997 struct nfs_pageio_descriptor pgio
;
1999 /* Resend all requests through the MDS */
2000 nfs_pageio_init_write(&pgio
, hdr
->inode
, FLUSH_STABLE
, true,
2001 hdr
->completion_ops
);
2002 set_bit(NFS_CONTEXT_RESEND_WRITES
, &hdr
->args
.context
->flags
);
2003 return nfs_pageio_resend(&pgio
, hdr
);
2005 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds
);
2007 static void pnfs_ld_handle_write_error(struct nfs_pgio_header
*hdr
)
2010 dprintk("pnfs write error = %d\n", hdr
->pnfs_error
);
2011 if (NFS_SERVER(hdr
->inode
)->pnfs_curr_ld
->flags
&
2012 PNFS_LAYOUTRET_ON_ERROR
) {
2013 pnfs_return_layout(hdr
->inode
);
2015 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
))
2016 hdr
->task
.tk_status
= pnfs_write_done_resend_to_mds(hdr
);
2020 * Called by non rpc-based layout drivers
2022 void pnfs_ld_write_done(struct nfs_pgio_header
*hdr
)
2024 if (likely(!hdr
->pnfs_error
)) {
2025 pnfs_set_layoutcommit(hdr
->inode
, hdr
->lseg
,
2026 hdr
->mds_offset
+ hdr
->res
.count
);
2027 hdr
->mds_ops
->rpc_call_done(&hdr
->task
, hdr
);
2029 trace_nfs4_pnfs_write(hdr
, hdr
->pnfs_error
);
2030 if (unlikely(hdr
->pnfs_error
))
2031 pnfs_ld_handle_write_error(hdr
);
2032 hdr
->mds_ops
->rpc_release(hdr
);
2034 EXPORT_SYMBOL_GPL(pnfs_ld_write_done
);
2037 pnfs_write_through_mds(struct nfs_pageio_descriptor
*desc
,
2038 struct nfs_pgio_header
*hdr
)
2040 struct nfs_pgio_mirror
*mirror
= nfs_pgio_current_mirror(desc
);
2042 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
2043 list_splice_tail_init(&hdr
->pages
, &mirror
->pg_list
);
2044 nfs_pageio_reset_write_mds(desc
);
2045 mirror
->pg_recoalesce
= 1;
2047 nfs_pgio_data_destroy(hdr
);
2051 static enum pnfs_try_status
2052 pnfs_try_to_write_data(struct nfs_pgio_header
*hdr
,
2053 const struct rpc_call_ops
*call_ops
,
2054 struct pnfs_layout_segment
*lseg
,
2057 struct inode
*inode
= hdr
->inode
;
2058 enum pnfs_try_status trypnfs
;
2059 struct nfs_server
*nfss
= NFS_SERVER(inode
);
2061 hdr
->mds_ops
= call_ops
;
2063 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__
,
2064 inode
->i_ino
, hdr
->args
.count
, hdr
->args
.offset
, how
);
2065 trypnfs
= nfss
->pnfs_curr_ld
->write_pagelist(hdr
, how
);
2066 if (trypnfs
!= PNFS_NOT_ATTEMPTED
)
2067 nfs_inc_stats(inode
, NFSIOS_PNFS_WRITE
);
2068 dprintk("%s End (trypnfs:%d)\n", __func__
, trypnfs
);
2073 pnfs_do_write(struct nfs_pageio_descriptor
*desc
,
2074 struct nfs_pgio_header
*hdr
, int how
)
2076 const struct rpc_call_ops
*call_ops
= desc
->pg_rpc_callops
;
2077 struct pnfs_layout_segment
*lseg
= desc
->pg_lseg
;
2078 enum pnfs_try_status trypnfs
;
2080 trypnfs
= pnfs_try_to_write_data(hdr
, call_ops
, lseg
, how
);
2081 if (trypnfs
== PNFS_NOT_ATTEMPTED
)
2082 pnfs_write_through_mds(desc
, hdr
);
2085 static void pnfs_writehdr_free(struct nfs_pgio_header
*hdr
)
2087 pnfs_put_lseg(hdr
->lseg
);
2088 nfs_pgio_header_free(hdr
);
2092 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor
*desc
)
2094 struct nfs_pgio_header
*hdr
;
2097 hdr
= nfs_pgio_header_alloc(desc
->pg_rw_ops
);
2099 desc
->pg_error
= -ENOMEM
;
2100 return desc
->pg_error
;
2102 nfs_pgheader_init(desc
, hdr
, pnfs_writehdr_free
);
2104 hdr
->lseg
= pnfs_get_lseg(desc
->pg_lseg
);
2105 ret
= nfs_generic_pgio(desc
, hdr
);
2107 pnfs_do_write(desc
, hdr
, desc
->pg_ioflags
);
2111 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages
);
2113 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header
*hdr
)
2115 struct nfs_pageio_descriptor pgio
;
2117 /* Resend all requests through the MDS */
2118 nfs_pageio_init_read(&pgio
, hdr
->inode
, true, hdr
->completion_ops
);
2119 return nfs_pageio_resend(&pgio
, hdr
);
2121 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds
);
2123 static void pnfs_ld_handle_read_error(struct nfs_pgio_header
*hdr
)
2125 dprintk("pnfs read error = %d\n", hdr
->pnfs_error
);
2126 if (NFS_SERVER(hdr
->inode
)->pnfs_curr_ld
->flags
&
2127 PNFS_LAYOUTRET_ON_ERROR
) {
2128 pnfs_return_layout(hdr
->inode
);
2130 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
))
2131 hdr
->task
.tk_status
= pnfs_read_done_resend_to_mds(hdr
);
2135 * Called by non rpc-based layout drivers
2137 void pnfs_ld_read_done(struct nfs_pgio_header
*hdr
)
2139 if (likely(!hdr
->pnfs_error
)) {
2140 __nfs4_read_done_cb(hdr
);
2141 hdr
->mds_ops
->rpc_call_done(&hdr
->task
, hdr
);
2143 trace_nfs4_pnfs_read(hdr
, hdr
->pnfs_error
);
2144 if (unlikely(hdr
->pnfs_error
))
2145 pnfs_ld_handle_read_error(hdr
);
2146 hdr
->mds_ops
->rpc_release(hdr
);
2148 EXPORT_SYMBOL_GPL(pnfs_ld_read_done
);
2151 pnfs_read_through_mds(struct nfs_pageio_descriptor
*desc
,
2152 struct nfs_pgio_header
*hdr
)
2154 struct nfs_pgio_mirror
*mirror
= nfs_pgio_current_mirror(desc
);
2156 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
2157 list_splice_tail_init(&hdr
->pages
, &mirror
->pg_list
);
2158 nfs_pageio_reset_read_mds(desc
);
2159 mirror
->pg_recoalesce
= 1;
2161 nfs_pgio_data_destroy(hdr
);
2166 * Call the appropriate parallel I/O subsystem read function.
2168 static enum pnfs_try_status
2169 pnfs_try_to_read_data(struct nfs_pgio_header
*hdr
,
2170 const struct rpc_call_ops
*call_ops
,
2171 struct pnfs_layout_segment
*lseg
)
2173 struct inode
*inode
= hdr
->inode
;
2174 struct nfs_server
*nfss
= NFS_SERVER(inode
);
2175 enum pnfs_try_status trypnfs
;
2177 hdr
->mds_ops
= call_ops
;
2179 dprintk("%s: Reading ino:%lu %u@%llu\n",
2180 __func__
, inode
->i_ino
, hdr
->args
.count
, hdr
->args
.offset
);
2182 trypnfs
= nfss
->pnfs_curr_ld
->read_pagelist(hdr
);
2183 if (trypnfs
!= PNFS_NOT_ATTEMPTED
)
2184 nfs_inc_stats(inode
, NFSIOS_PNFS_READ
);
2185 dprintk("%s End (trypnfs:%d)\n", __func__
, trypnfs
);
2189 /* Resend all requests through pnfs. */
2190 void pnfs_read_resend_pnfs(struct nfs_pgio_header
*hdr
)
2192 struct nfs_pageio_descriptor pgio
;
2194 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
2195 nfs_pageio_init_read(&pgio
, hdr
->inode
, false,
2196 hdr
->completion_ops
);
2197 hdr
->task
.tk_status
= nfs_pageio_resend(&pgio
, hdr
);
2200 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs
);
2203 pnfs_do_read(struct nfs_pageio_descriptor
*desc
, struct nfs_pgio_header
*hdr
)
2205 const struct rpc_call_ops
*call_ops
= desc
->pg_rpc_callops
;
2206 struct pnfs_layout_segment
*lseg
= desc
->pg_lseg
;
2207 enum pnfs_try_status trypnfs
;
2209 trypnfs
= pnfs_try_to_read_data(hdr
, call_ops
, lseg
);
2210 if (trypnfs
== PNFS_TRY_AGAIN
)
2211 pnfs_read_resend_pnfs(hdr
);
2212 if (trypnfs
== PNFS_NOT_ATTEMPTED
|| hdr
->task
.tk_status
)
2213 pnfs_read_through_mds(desc
, hdr
);
2216 static void pnfs_readhdr_free(struct nfs_pgio_header
*hdr
)
2218 pnfs_put_lseg(hdr
->lseg
);
2219 nfs_pgio_header_free(hdr
);
2223 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor
*desc
)
2225 struct nfs_pgio_header
*hdr
;
2228 hdr
= nfs_pgio_header_alloc(desc
->pg_rw_ops
);
2230 desc
->pg_error
= -ENOMEM
;
2231 return desc
->pg_error
;
2233 nfs_pgheader_init(desc
, hdr
, pnfs_readhdr_free
);
2234 hdr
->lseg
= pnfs_get_lseg(desc
->pg_lseg
);
2235 ret
= nfs_generic_pgio(desc
, hdr
);
2237 pnfs_do_read(desc
, hdr
);
2240 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages
);
2242 static void pnfs_clear_layoutcommitting(struct inode
*inode
)
2244 unsigned long *bitlock
= &NFS_I(inode
)->flags
;
2246 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING
, bitlock
);
2247 smp_mb__after_atomic();
2248 wake_up_bit(bitlock
, NFS_INO_LAYOUTCOMMITTING
);
2252 * There can be multiple RW segments.
2254 static void pnfs_list_write_lseg(struct inode
*inode
, struct list_head
*listp
)
2256 struct pnfs_layout_segment
*lseg
;
2258 list_for_each_entry(lseg
, &NFS_I(inode
)->layout
->plh_segs
, pls_list
) {
2259 if (lseg
->pls_range
.iomode
== IOMODE_RW
&&
2260 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
))
2261 list_add(&lseg
->pls_lc_list
, listp
);
2265 static void pnfs_list_write_lseg_done(struct inode
*inode
, struct list_head
*listp
)
2267 struct pnfs_layout_segment
*lseg
, *tmp
;
2269 /* Matched by references in pnfs_set_layoutcommit */
2270 list_for_each_entry_safe(lseg
, tmp
, listp
, pls_lc_list
) {
2271 list_del_init(&lseg
->pls_lc_list
);
2272 pnfs_put_lseg(lseg
);
2275 pnfs_clear_layoutcommitting(inode
);
2278 void pnfs_set_lo_fail(struct pnfs_layout_segment
*lseg
)
2280 pnfs_layout_io_set_failed(lseg
->pls_layout
, lseg
->pls_range
.iomode
);
2282 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail
);
2285 pnfs_set_layoutcommit(struct inode
*inode
, struct pnfs_layout_segment
*lseg
,
2288 struct nfs_inode
*nfsi
= NFS_I(inode
);
2289 bool mark_as_dirty
= false;
2291 spin_lock(&inode
->i_lock
);
2292 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
)) {
2293 nfsi
->layout
->plh_lwb
= end_pos
;
2294 mark_as_dirty
= true;
2295 dprintk("%s: Set layoutcommit for inode %lu ",
2296 __func__
, inode
->i_ino
);
2297 } else if (end_pos
> nfsi
->layout
->plh_lwb
)
2298 nfsi
->layout
->plh_lwb
= end_pos
;
2299 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
)) {
2300 /* references matched in nfs4_layoutcommit_release */
2301 pnfs_get_lseg(lseg
);
2303 spin_unlock(&inode
->i_lock
);
2304 dprintk("%s: lseg %p end_pos %llu\n",
2305 __func__
, lseg
, nfsi
->layout
->plh_lwb
);
2307 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2308 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2310 mark_inode_dirty_sync(inode
);
2312 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit
);
2314 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data
*data
)
2316 struct nfs_server
*nfss
= NFS_SERVER(data
->args
.inode
);
2318 if (nfss
->pnfs_curr_ld
->cleanup_layoutcommit
)
2319 nfss
->pnfs_curr_ld
->cleanup_layoutcommit(data
);
2320 pnfs_list_write_lseg_done(data
->args
.inode
, &data
->lseg_list
);
2324 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
2325 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
2326 * data to disk to allow the server to recover the data if it crashes.
2327 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
2328 * is off, and a COMMIT is sent to a data server, or
2329 * if WRITEs to a data server return NFS_DATA_SYNC.
2332 pnfs_layoutcommit_inode(struct inode
*inode
, bool sync
)
2334 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(inode
)->pnfs_curr_ld
;
2335 struct nfs4_layoutcommit_data
*data
;
2336 struct nfs_inode
*nfsi
= NFS_I(inode
);
2340 if (!pnfs_layoutcommit_outstanding(inode
))
2343 dprintk("--> %s inode %lu\n", __func__
, inode
->i_ino
);
2346 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING
, &nfsi
->flags
)) {
2349 status
= wait_on_bit_lock_action(&nfsi
->flags
,
2350 NFS_INO_LAYOUTCOMMITTING
,
2351 nfs_wait_bit_killable
,
2358 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
2359 data
= kzalloc(sizeof(*data
), GFP_NOFS
);
2361 goto clear_layoutcommitting
;
2364 spin_lock(&inode
->i_lock
);
2365 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
))
2368 INIT_LIST_HEAD(&data
->lseg_list
);
2369 pnfs_list_write_lseg(inode
, &data
->lseg_list
);
2371 end_pos
= nfsi
->layout
->plh_lwb
;
2373 nfs4_stateid_copy(&data
->args
.stateid
, &nfsi
->layout
->plh_stateid
);
2374 spin_unlock(&inode
->i_lock
);
2376 data
->args
.inode
= inode
;
2377 data
->cred
= get_rpccred(nfsi
->layout
->plh_lc_cred
);
2378 nfs_fattr_init(&data
->fattr
);
2379 data
->args
.bitmask
= NFS_SERVER(inode
)->cache_consistency_bitmask
;
2380 data
->res
.fattr
= &data
->fattr
;
2381 data
->args
.lastbytewritten
= end_pos
- 1;
2382 data
->res
.server
= NFS_SERVER(inode
);
2384 if (ld
->prepare_layoutcommit
) {
2385 status
= ld
->prepare_layoutcommit(&data
->args
);
2387 put_rpccred(data
->cred
);
2388 spin_lock(&inode
->i_lock
);
2389 set_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
);
2390 if (end_pos
> nfsi
->layout
->plh_lwb
)
2391 nfsi
->layout
->plh_lwb
= end_pos
;
2397 status
= nfs4_proc_layoutcommit(data
, sync
);
2400 mark_inode_dirty_sync(inode
);
2401 dprintk("<-- %s status %d\n", __func__
, status
);
2404 spin_unlock(&inode
->i_lock
);
2406 clear_layoutcommitting
:
2407 pnfs_clear_layoutcommitting(inode
);
2410 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode
);
2413 pnfs_generic_sync(struct inode
*inode
, bool datasync
)
2415 return pnfs_layoutcommit_inode(inode
, true);
2417 EXPORT_SYMBOL_GPL(pnfs_generic_sync
);
2419 struct nfs4_threshold
*pnfs_mdsthreshold_alloc(void)
2421 struct nfs4_threshold
*thp
;
2423 thp
= kzalloc(sizeof(*thp
), GFP_NOFS
);
2425 dprintk("%s mdsthreshold allocation failed\n", __func__
);
2431 #if IS_ENABLED(CONFIG_NFS_V4_2)
2433 pnfs_report_layoutstat(struct inode
*inode
, gfp_t gfp_flags
)
2435 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(inode
)->pnfs_curr_ld
;
2436 struct nfs_server
*server
= NFS_SERVER(inode
);
2437 struct nfs_inode
*nfsi
= NFS_I(inode
);
2438 struct nfs42_layoutstat_data
*data
;
2439 struct pnfs_layout_hdr
*hdr
;
2442 if (!pnfs_enabled_sb(server
) || !ld
->prepare_layoutstats
)
2445 if (!nfs_server_capable(inode
, NFS_CAP_LAYOUTSTATS
))
2448 if (test_and_set_bit(NFS_INO_LAYOUTSTATS
, &nfsi
->flags
))
2451 spin_lock(&inode
->i_lock
);
2452 if (!NFS_I(inode
)->layout
) {
2453 spin_unlock(&inode
->i_lock
);
2454 goto out_clear_layoutstats
;
2456 hdr
= NFS_I(inode
)->layout
;
2457 pnfs_get_layout_hdr(hdr
);
2458 spin_unlock(&inode
->i_lock
);
2460 data
= kzalloc(sizeof(*data
), gfp_flags
);
2466 data
->args
.fh
= NFS_FH(inode
);
2467 data
->args
.inode
= inode
;
2468 nfs4_stateid_copy(&data
->args
.stateid
, &hdr
->plh_stateid
);
2469 status
= ld
->prepare_layoutstats(&data
->args
);
2473 status
= nfs42_proc_layoutstats_generic(NFS_SERVER(inode
), data
);
2476 dprintk("%s returns %d\n", __func__
, status
);
2482 pnfs_put_layout_hdr(hdr
);
2483 out_clear_layoutstats
:
2484 smp_mb__before_atomic();
2485 clear_bit(NFS_INO_LAYOUTSTATS
, &nfsi
->flags
);
2486 smp_mb__after_atomic();
2489 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat
);
2492 unsigned int layoutstats_timer
;
2493 module_param(layoutstats_timer
, uint
, 0644);
2494 EXPORT_SYMBOL_GPL(layoutstats_timer
);