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 pnfs_choose_layoutget_stateid(nfs4_stateid
*dst
, struct pnfs_layout_hdr
*lo
,
801 const struct pnfs_layout_range
*range
,
802 struct nfs4_state
*open_state
)
806 dprintk("--> %s\n", __func__
);
807 spin_lock(&lo
->plh_inode
->i_lock
);
808 if (pnfs_layoutgets_blocked(lo
)) {
810 } else if (!nfs4_valid_open_stateid(open_state
)) {
812 } else if (list_empty(&lo
->plh_segs
) ||
813 test_bit(NFS_LAYOUT_INVALID_STID
, &lo
->plh_flags
)) {
817 seq
= read_seqbegin(&open_state
->seqlock
);
818 nfs4_stateid_copy(dst
, &open_state
->stateid
);
819 } while (read_seqretry(&open_state
->seqlock
, seq
));
821 nfs4_stateid_copy(dst
, &lo
->plh_stateid
);
822 spin_unlock(&lo
->plh_inode
->i_lock
);
823 dprintk("<-- %s\n", __func__
);
828 * Get layout from server.
829 * for now, assume that whole file layouts are requested.
831 * arg->length: all ones
833 static struct pnfs_layout_segment
*
834 send_layoutget(struct pnfs_layout_hdr
*lo
,
835 struct nfs_open_context
*ctx
,
836 const struct pnfs_layout_range
*range
,
839 struct inode
*ino
= lo
->plh_inode
;
840 struct nfs_server
*server
= NFS_SERVER(ino
);
841 struct nfs4_layoutget
*lgp
;
842 struct pnfs_layout_segment
*lseg
;
845 dprintk("--> %s\n", __func__
);
848 * Synchronously retrieve layout information from server and
849 * store in lseg. If we race with a concurrent seqid morphing
850 * op, then re-send the LAYOUTGET.
853 lgp
= kzalloc(sizeof(*lgp
), gfp_flags
);
857 i_size
= i_size_read(ino
);
859 lgp
->args
.minlength
= PAGE_SIZE
;
860 if (lgp
->args
.minlength
> range
->length
)
861 lgp
->args
.minlength
= range
->length
;
862 if (range
->iomode
== IOMODE_READ
) {
863 if (range
->offset
>= i_size
)
864 lgp
->args
.minlength
= 0;
865 else if (i_size
- range
->offset
< lgp
->args
.minlength
)
866 lgp
->args
.minlength
= i_size
- range
->offset
;
868 lgp
->args
.maxcount
= PNFS_LAYOUT_MAXSIZE
;
869 pnfs_copy_range(&lgp
->args
.range
, range
);
870 lgp
->args
.type
= server
->pnfs_curr_ld
->id
;
871 lgp
->args
.inode
= ino
;
872 lgp
->args
.ctx
= get_nfs_open_context(ctx
);
873 lgp
->gfp_flags
= gfp_flags
;
874 lgp
->cred
= lo
->plh_lc_cred
;
876 lseg
= nfs4_proc_layoutget(lgp
, gfp_flags
);
877 } while (lseg
== ERR_PTR(-EAGAIN
));
879 if (IS_ERR(lseg
) && !nfs_error_is_fatal(PTR_ERR(lseg
)))
882 pnfs_layout_clear_fail_bit(lo
,
883 pnfs_iomode_to_fail_bit(range
->iomode
));
888 static void pnfs_clear_layoutcommit(struct inode
*inode
,
889 struct list_head
*head
)
891 struct nfs_inode
*nfsi
= NFS_I(inode
);
892 struct pnfs_layout_segment
*lseg
, *tmp
;
894 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
))
896 list_for_each_entry_safe(lseg
, tmp
, &nfsi
->layout
->plh_segs
, pls_list
) {
897 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
))
899 pnfs_lseg_dec_and_remove_zero(lseg
, head
);
903 void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr
*lo
)
905 clear_bit_unlock(NFS_LAYOUT_RETURN
, &lo
->plh_flags
);
906 smp_mb__after_atomic();
907 wake_up_bit(&lo
->plh_flags
, NFS_LAYOUT_RETURN
);
908 rpc_wake_up(&NFS_SERVER(lo
->plh_inode
)->roc_rpcwaitq
);
912 pnfs_prepare_layoutreturn(struct pnfs_layout_hdr
*lo
)
914 if (test_and_set_bit(NFS_LAYOUT_RETURN
, &lo
->plh_flags
))
916 lo
->plh_return_iomode
= 0;
917 lo
->plh_return_seq
= 0;
918 pnfs_get_layout_hdr(lo
);
919 clear_bit(NFS_LAYOUT_RETURN_REQUESTED
, &lo
->plh_flags
);
924 pnfs_send_layoutreturn(struct pnfs_layout_hdr
*lo
, const nfs4_stateid
*stateid
,
925 enum pnfs_iomode iomode
, bool sync
)
927 struct inode
*ino
= lo
->plh_inode
;
928 struct nfs4_layoutreturn
*lrp
;
931 lrp
= kzalloc(sizeof(*lrp
), GFP_NOFS
);
932 if (unlikely(lrp
== NULL
)) {
934 spin_lock(&ino
->i_lock
);
935 pnfs_clear_layoutreturn_waitbit(lo
);
936 spin_unlock(&ino
->i_lock
);
937 pnfs_put_layout_hdr(lo
);
941 nfs4_stateid_copy(&lrp
->args
.stateid
, stateid
);
942 lrp
->args
.layout_type
= NFS_SERVER(ino
)->pnfs_curr_ld
->id
;
943 lrp
->args
.inode
= ino
;
944 lrp
->args
.range
.iomode
= iomode
;
945 lrp
->args
.range
.offset
= 0;
946 lrp
->args
.range
.length
= NFS4_MAX_UINT64
;
947 lrp
->args
.layout
= lo
;
948 lrp
->clp
= NFS_SERVER(ino
)->nfs_client
;
949 lrp
->cred
= lo
->plh_lc_cred
;
951 status
= nfs4_proc_layoutreturn(lrp
, sync
);
953 dprintk("<-- %s status: %d\n", __func__
, status
);
957 /* Return true if layoutreturn is needed */
959 pnfs_layout_need_return(struct pnfs_layout_hdr
*lo
)
961 struct pnfs_layout_segment
*s
;
963 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED
, &lo
->plh_flags
))
966 /* Defer layoutreturn until all lsegs are done */
967 list_for_each_entry(s
, &lo
->plh_segs
, pls_list
) {
968 if (test_bit(NFS_LSEG_LAYOUTRETURN
, &s
->pls_flags
))
975 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr
*lo
)
977 struct inode
*inode
= lo
->plh_inode
;
979 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED
, &lo
->plh_flags
))
981 spin_lock(&inode
->i_lock
);
982 if (pnfs_layout_need_return(lo
)) {
983 nfs4_stateid stateid
;
984 enum pnfs_iomode iomode
;
987 nfs4_stateid_copy(&stateid
, &lo
->plh_stateid
);
988 stateid
.seqid
= cpu_to_be32(lo
->plh_return_seq
);
989 iomode
= lo
->plh_return_iomode
;
990 send
= pnfs_prepare_layoutreturn(lo
);
991 spin_unlock(&inode
->i_lock
);
993 /* Send an async layoutreturn so we dont deadlock */
994 pnfs_send_layoutreturn(lo
, &stateid
, iomode
, false);
997 spin_unlock(&inode
->i_lock
);
1001 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
1002 * when the layout segment list is empty.
1004 * Note that a pnfs_layout_hdr can exist with an empty layout segment
1005 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
1006 * deviceid is marked invalid.
1009 _pnfs_return_layout(struct inode
*ino
)
1011 struct pnfs_layout_hdr
*lo
= NULL
;
1012 struct nfs_inode
*nfsi
= NFS_I(ino
);
1013 LIST_HEAD(tmp_list
);
1014 nfs4_stateid stateid
;
1015 int status
= 0, empty
;
1018 dprintk("NFS: %s for inode %lu\n", __func__
, ino
->i_ino
);
1020 spin_lock(&ino
->i_lock
);
1023 spin_unlock(&ino
->i_lock
);
1024 dprintk("NFS: %s no layout to return\n", __func__
);
1027 nfs4_stateid_copy(&stateid
, &nfsi
->layout
->plh_stateid
);
1028 /* Reference matched in nfs4_layoutreturn_release */
1029 pnfs_get_layout_hdr(lo
);
1030 empty
= list_empty(&lo
->plh_segs
);
1031 pnfs_clear_layoutcommit(ino
, &tmp_list
);
1032 pnfs_mark_matching_lsegs_invalid(lo
, &tmp_list
, NULL
, 0);
1034 if (NFS_SERVER(ino
)->pnfs_curr_ld
->return_range
) {
1035 struct pnfs_layout_range range
= {
1036 .iomode
= IOMODE_ANY
,
1038 .length
= NFS4_MAX_UINT64
,
1040 NFS_SERVER(ino
)->pnfs_curr_ld
->return_range(lo
, &range
);
1043 /* Don't send a LAYOUTRETURN if list was initially empty */
1045 spin_unlock(&ino
->i_lock
);
1046 dprintk("NFS: %s no layout segments to return\n", __func__
);
1047 goto out_put_layout_hdr
;
1050 set_bit(NFS_LAYOUT_INVALID_STID
, &lo
->plh_flags
);
1051 send
= pnfs_prepare_layoutreturn(lo
);
1052 spin_unlock(&ino
->i_lock
);
1053 pnfs_free_lseg_list(&tmp_list
);
1055 status
= pnfs_send_layoutreturn(lo
, &stateid
, IOMODE_ANY
, true);
1057 pnfs_put_layout_hdr(lo
);
1059 dprintk("<-- %s status: %d\n", __func__
, status
);
1062 EXPORT_SYMBOL_GPL(_pnfs_return_layout
);
1065 pnfs_commit_and_return_layout(struct inode
*inode
)
1067 struct pnfs_layout_hdr
*lo
;
1070 spin_lock(&inode
->i_lock
);
1071 lo
= NFS_I(inode
)->layout
;
1073 spin_unlock(&inode
->i_lock
);
1076 pnfs_get_layout_hdr(lo
);
1077 /* Block new layoutgets and read/write to ds */
1078 lo
->plh_block_lgets
++;
1079 spin_unlock(&inode
->i_lock
);
1080 filemap_fdatawait(inode
->i_mapping
);
1081 ret
= pnfs_layoutcommit_inode(inode
, true);
1083 ret
= _pnfs_return_layout(inode
);
1084 spin_lock(&inode
->i_lock
);
1085 lo
->plh_block_lgets
--;
1086 spin_unlock(&inode
->i_lock
);
1087 pnfs_put_layout_hdr(lo
);
1091 bool pnfs_roc(struct inode
*ino
)
1093 struct nfs_inode
*nfsi
= NFS_I(ino
);
1094 struct nfs_open_context
*ctx
;
1095 struct nfs4_state
*state
;
1096 struct pnfs_layout_hdr
*lo
;
1097 struct pnfs_layout_segment
*lseg
, *tmp
;
1098 nfs4_stateid stateid
;
1099 LIST_HEAD(tmp_list
);
1100 bool found
= false, layoutreturn
= false, roc
= false;
1102 spin_lock(&ino
->i_lock
);
1104 if (!lo
|| test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
))
1107 /* no roc if we hold a delegation */
1108 if (nfs4_check_delegation(ino
, FMODE_READ
))
1111 list_for_each_entry(ctx
, &nfsi
->open_files
, list
) {
1113 /* Don't return layout if there is open file state */
1114 if (state
!= NULL
&& state
->state
!= 0)
1118 nfs4_stateid_copy(&stateid
, &lo
->plh_stateid
);
1119 /* always send layoutreturn if being marked so */
1120 if (test_and_clear_bit(NFS_LAYOUT_RETURN_REQUESTED
,
1122 layoutreturn
= pnfs_prepare_layoutreturn(lo
);
1124 list_for_each_entry_safe(lseg
, tmp
, &lo
->plh_segs
, pls_list
)
1125 /* If we are sending layoutreturn, invalidate all valid lsegs */
1126 if (layoutreturn
|| test_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
)) {
1127 mark_lseg_invalid(lseg
, &tmp_list
);
1130 /* ROC in two conditions:
1131 * 1. there are ROC lsegs
1132 * 2. we don't send layoutreturn
1134 if (found
&& !layoutreturn
) {
1135 /* lo ref dropped in pnfs_roc_release() */
1136 pnfs_get_layout_hdr(lo
);
1141 spin_unlock(&ino
->i_lock
);
1142 pnfs_free_lseg_list(&tmp_list
);
1143 pnfs_layoutcommit_inode(ino
, true);
1145 pnfs_send_layoutreturn(lo
, &stateid
, IOMODE_ANY
, true);
1149 void pnfs_roc_release(struct inode
*ino
)
1151 struct pnfs_layout_hdr
*lo
;
1153 spin_lock(&ino
->i_lock
);
1154 lo
= NFS_I(ino
)->layout
;
1155 pnfs_clear_layoutreturn_waitbit(lo
);
1156 if (atomic_dec_and_test(&lo
->plh_refcount
)) {
1157 pnfs_detach_layout_hdr(lo
);
1158 spin_unlock(&ino
->i_lock
);
1159 pnfs_free_layout_hdr(lo
);
1161 spin_unlock(&ino
->i_lock
);
1164 void pnfs_roc_set_barrier(struct inode
*ino
, u32 barrier
)
1166 struct pnfs_layout_hdr
*lo
;
1168 spin_lock(&ino
->i_lock
);
1169 lo
= NFS_I(ino
)->layout
;
1170 pnfs_mark_layout_returned_if_empty(lo
);
1171 if (pnfs_seqid_is_newer(barrier
, lo
->plh_barrier
))
1172 lo
->plh_barrier
= barrier
;
1173 spin_unlock(&ino
->i_lock
);
1174 trace_nfs4_layoutreturn_on_close(ino
, 0);
1177 void pnfs_roc_get_barrier(struct inode
*ino
, u32
*barrier
)
1179 struct nfs_inode
*nfsi
= NFS_I(ino
);
1180 struct pnfs_layout_hdr
*lo
;
1183 spin_lock(&ino
->i_lock
);
1185 current_seqid
= be32_to_cpu(lo
->plh_stateid
.seqid
);
1187 /* Since close does not return a layout stateid for use as
1188 * a barrier, we choose the worst-case barrier.
1190 *barrier
= current_seqid
+ atomic_read(&lo
->plh_outstanding
);
1191 spin_unlock(&ino
->i_lock
);
1194 bool pnfs_wait_on_layoutreturn(struct inode
*ino
, struct rpc_task
*task
)
1196 struct nfs_inode
*nfsi
= NFS_I(ino
);
1197 struct pnfs_layout_hdr
*lo
;
1200 /* we might not have grabbed lo reference. so need to check under
1202 spin_lock(&ino
->i_lock
);
1204 if (lo
&& test_bit(NFS_LAYOUT_RETURN
, &lo
->plh_flags
))
1206 spin_unlock(&ino
->i_lock
);
1209 rpc_sleep_on(&NFS_SERVER(ino
)->roc_rpcwaitq
, task
, NULL
);
1215 * Compare two layout segments for sorting into layout cache.
1216 * We want to preferentially return RW over RO layouts, so ensure those
1220 pnfs_lseg_range_cmp(const struct pnfs_layout_range
*l1
,
1221 const struct pnfs_layout_range
*l2
)
1225 /* high offset > low offset */
1226 d
= l1
->offset
- l2
->offset
;
1230 /* short length > long length */
1231 d
= l2
->length
- l1
->length
;
1235 /* read > read/write */
1236 return (int)(l1
->iomode
== IOMODE_READ
) - (int)(l2
->iomode
== IOMODE_READ
);
1240 pnfs_lseg_range_is_after(const struct pnfs_layout_range
*l1
,
1241 const struct pnfs_layout_range
*l2
)
1243 return pnfs_lseg_range_cmp(l1
, l2
) > 0;
1247 pnfs_lseg_no_merge(struct pnfs_layout_segment
*lseg
,
1248 struct pnfs_layout_segment
*old
)
1254 pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr
*lo
,
1255 struct pnfs_layout_segment
*lseg
,
1256 bool (*is_after
)(const struct pnfs_layout_range
*,
1257 const struct pnfs_layout_range
*),
1258 bool (*do_merge
)(struct pnfs_layout_segment
*,
1259 struct pnfs_layout_segment
*),
1260 struct list_head
*free_me
)
1262 struct pnfs_layout_segment
*lp
, *tmp
;
1264 dprintk("%s:Begin\n", __func__
);
1266 list_for_each_entry_safe(lp
, tmp
, &lo
->plh_segs
, pls_list
) {
1267 if (test_bit(NFS_LSEG_VALID
, &lp
->pls_flags
) == 0)
1269 if (do_merge(lseg
, lp
)) {
1270 mark_lseg_invalid(lp
, free_me
);
1273 if (is_after(&lseg
->pls_range
, &lp
->pls_range
))
1275 list_add_tail(&lseg
->pls_list
, &lp
->pls_list
);
1276 dprintk("%s: inserted lseg %p "
1277 "iomode %d offset %llu length %llu before "
1278 "lp %p iomode %d offset %llu length %llu\n",
1279 __func__
, lseg
, lseg
->pls_range
.iomode
,
1280 lseg
->pls_range
.offset
, lseg
->pls_range
.length
,
1281 lp
, lp
->pls_range
.iomode
, lp
->pls_range
.offset
,
1282 lp
->pls_range
.length
);
1285 list_add_tail(&lseg
->pls_list
, &lo
->plh_segs
);
1286 dprintk("%s: inserted lseg %p "
1287 "iomode %d offset %llu length %llu at tail\n",
1288 __func__
, lseg
, lseg
->pls_range
.iomode
,
1289 lseg
->pls_range
.offset
, lseg
->pls_range
.length
);
1291 pnfs_get_layout_hdr(lo
);
1293 dprintk("%s:Return\n", __func__
);
1295 EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg
);
1298 pnfs_layout_insert_lseg(struct pnfs_layout_hdr
*lo
,
1299 struct pnfs_layout_segment
*lseg
,
1300 struct list_head
*free_me
)
1302 struct inode
*inode
= lo
->plh_inode
;
1303 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(inode
)->pnfs_curr_ld
;
1305 if (ld
->add_lseg
!= NULL
)
1306 ld
->add_lseg(lo
, lseg
, free_me
);
1308 pnfs_generic_layout_insert_lseg(lo
, lseg
,
1309 pnfs_lseg_range_is_after
,
1314 static struct pnfs_layout_hdr
*
1315 alloc_init_layout_hdr(struct inode
*ino
,
1316 struct nfs_open_context
*ctx
,
1319 struct pnfs_layout_hdr
*lo
;
1321 lo
= pnfs_alloc_layout_hdr(ino
, gfp_flags
);
1324 atomic_set(&lo
->plh_refcount
, 1);
1325 INIT_LIST_HEAD(&lo
->plh_layouts
);
1326 INIT_LIST_HEAD(&lo
->plh_segs
);
1327 INIT_LIST_HEAD(&lo
->plh_bulk_destroy
);
1328 lo
->plh_inode
= ino
;
1329 lo
->plh_lc_cred
= get_rpccred(ctx
->cred
);
1333 static struct pnfs_layout_hdr
*
1334 pnfs_find_alloc_layout(struct inode
*ino
,
1335 struct nfs_open_context
*ctx
,
1338 struct nfs_inode
*nfsi
= NFS_I(ino
);
1339 struct pnfs_layout_hdr
*new = NULL
;
1341 dprintk("%s Begin ino=%p layout=%p\n", __func__
, ino
, nfsi
->layout
);
1343 if (nfsi
->layout
!= NULL
)
1345 spin_unlock(&ino
->i_lock
);
1346 new = alloc_init_layout_hdr(ino
, ctx
, gfp_flags
);
1347 spin_lock(&ino
->i_lock
);
1349 if (likely(nfsi
->layout
== NULL
)) { /* Won the race? */
1352 } else if (new != NULL
)
1353 pnfs_free_layout_hdr(new);
1355 pnfs_get_layout_hdr(nfsi
->layout
);
1356 return nfsi
->layout
;
1360 * iomode matching rules:
1371 pnfs_lseg_range_match(const struct pnfs_layout_range
*ls_range
,
1372 const struct pnfs_layout_range
*range
)
1374 struct pnfs_layout_range range1
;
1376 if ((range
->iomode
== IOMODE_RW
&&
1377 ls_range
->iomode
!= IOMODE_RW
) ||
1378 !pnfs_lseg_range_intersecting(ls_range
, range
))
1381 /* range1 covers only the first byte in the range */
1384 return pnfs_lseg_range_contained(ls_range
, &range1
);
1388 * lookup range in layout
1390 static struct pnfs_layout_segment
*
1391 pnfs_find_lseg(struct pnfs_layout_hdr
*lo
,
1392 struct pnfs_layout_range
*range
)
1394 struct pnfs_layout_segment
*lseg
, *ret
= NULL
;
1396 dprintk("%s:Begin\n", __func__
);
1398 list_for_each_entry(lseg
, &lo
->plh_segs
, pls_list
) {
1399 if (test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
) &&
1400 !test_bit(NFS_LSEG_LAYOUTRETURN
, &lseg
->pls_flags
) &&
1401 pnfs_lseg_range_match(&lseg
->pls_range
, range
)) {
1402 ret
= pnfs_get_lseg(lseg
);
1407 dprintk("%s:Return lseg %p ref %d\n",
1408 __func__
, ret
, ret
? atomic_read(&ret
->pls_refcount
) : 0);
1413 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1414 * to the MDS or over pNFS
1416 * The nfs_inode read_io and write_io fields are cumulative counters reset
1417 * when there are no layout segments. Note that in pnfs_update_layout iomode
1418 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1421 * A return of true means use MDS I/O.
1424 * If a file's size is smaller than the file size threshold, data accesses
1425 * SHOULD be sent to the metadata server. If an I/O request has a length that
1426 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1427 * server. If both file size and I/O size are provided, the client SHOULD
1428 * reach or exceed both thresholds before sending its read or write
1429 * requests to the data server.
1431 static bool pnfs_within_mdsthreshold(struct nfs_open_context
*ctx
,
1432 struct inode
*ino
, int iomode
)
1434 struct nfs4_threshold
*t
= ctx
->mdsthreshold
;
1435 struct nfs_inode
*nfsi
= NFS_I(ino
);
1436 loff_t fsize
= i_size_read(ino
);
1437 bool size
= false, size_set
= false, io
= false, io_set
= false, ret
= false;
1442 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1443 __func__
, t
->bm
, t
->rd_sz
, t
->wr_sz
, t
->rd_io_sz
, t
->wr_io_sz
);
1447 if (t
->bm
& THRESHOLD_RD
) {
1448 dprintk("%s fsize %llu\n", __func__
, fsize
);
1450 if (fsize
< t
->rd_sz
)
1453 if (t
->bm
& THRESHOLD_RD_IO
) {
1454 dprintk("%s nfsi->read_io %llu\n", __func__
,
1457 if (nfsi
->read_io
< t
->rd_io_sz
)
1462 if (t
->bm
& THRESHOLD_WR
) {
1463 dprintk("%s fsize %llu\n", __func__
, fsize
);
1465 if (fsize
< t
->wr_sz
)
1468 if (t
->bm
& THRESHOLD_WR_IO
) {
1469 dprintk("%s nfsi->write_io %llu\n", __func__
,
1472 if (nfsi
->write_io
< t
->wr_io_sz
)
1477 if (size_set
&& io_set
) {
1480 } else if (size
|| io
)
1483 dprintk("<-- %s size %d io %d ret %d\n", __func__
, size
, io
, ret
);
1487 static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr
*lo
)
1490 * send layoutcommit as it can hold up layoutreturn due to lseg
1493 pnfs_layoutcommit_inode(lo
->plh_inode
, false);
1494 return !wait_on_bit_action(&lo
->plh_flags
, NFS_LAYOUT_RETURN
,
1495 nfs_wait_bit_killable
,
1496 TASK_UNINTERRUPTIBLE
);
1499 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr
*lo
)
1501 unsigned long *bitlock
= &lo
->plh_flags
;
1503 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET
, bitlock
);
1504 smp_mb__after_atomic();
1505 wake_up_bit(bitlock
, NFS_LAYOUT_FIRST_LAYOUTGET
);
1509 * Layout segment is retreived from the server if not cached.
1510 * The appropriate layout segment is referenced and returned to the caller.
1512 struct pnfs_layout_segment
*
1513 pnfs_update_layout(struct inode
*ino
,
1514 struct nfs_open_context
*ctx
,
1517 enum pnfs_iomode iomode
,
1520 struct pnfs_layout_range arg
= {
1526 struct nfs_server
*server
= NFS_SERVER(ino
);
1527 struct nfs_client
*clp
= server
->nfs_client
;
1528 struct pnfs_layout_hdr
*lo
;
1529 struct pnfs_layout_segment
*lseg
= NULL
;
1532 if (!pnfs_enabled_sb(NFS_SERVER(ino
))) {
1533 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, NULL
,
1534 PNFS_UPDATE_LAYOUT_NO_PNFS
);
1538 if (iomode
== IOMODE_READ
&& i_size_read(ino
) == 0) {
1539 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, NULL
,
1540 PNFS_UPDATE_LAYOUT_RD_ZEROLEN
);
1544 if (pnfs_within_mdsthreshold(ctx
, ino
, iomode
)) {
1545 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, NULL
,
1546 PNFS_UPDATE_LAYOUT_MDSTHRESH
);
1552 spin_lock(&ino
->i_lock
);
1553 lo
= pnfs_find_alloc_layout(ino
, ctx
, gfp_flags
);
1555 spin_unlock(&ino
->i_lock
);
1556 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, NULL
,
1557 PNFS_UPDATE_LAYOUT_NOMEM
);
1561 /* Do we even need to bother with this? */
1562 if (test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
)) {
1563 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
,
1564 PNFS_UPDATE_LAYOUT_BULK_RECALL
);
1565 dprintk("%s matches recall, use MDS\n", __func__
);
1569 /* if LAYOUTGET already failed once we don't try again */
1570 if (pnfs_layout_io_test_failed(lo
, iomode
)) {
1571 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
,
1572 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL
);
1576 first
= list_empty(&lo
->plh_segs
);
1578 /* The first layoutget for the file. Need to serialize per
1579 * RFC 5661 Errata 3208.
1581 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET
,
1583 spin_unlock(&ino
->i_lock
);
1584 wait_on_bit(&lo
->plh_flags
, NFS_LAYOUT_FIRST_LAYOUTGET
,
1585 TASK_UNINTERRUPTIBLE
);
1586 pnfs_put_layout_hdr(lo
);
1590 /* Check to see if the layout for the given range
1593 lseg
= pnfs_find_lseg(lo
, &arg
);
1595 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
,
1596 PNFS_UPDATE_LAYOUT_FOUND_CACHED
);
1602 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
1603 * for LAYOUTRETURN even if first is true.
1605 if (test_bit(NFS_LAYOUT_RETURN
, &lo
->plh_flags
)) {
1606 spin_unlock(&ino
->i_lock
);
1607 dprintk("%s wait for layoutreturn\n", __func__
);
1608 if (pnfs_prepare_to_retry_layoutget(lo
)) {
1610 pnfs_clear_first_layoutget(lo
);
1611 pnfs_put_layout_hdr(lo
);
1612 dprintk("%s retrying\n", __func__
);
1615 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
,
1616 PNFS_UPDATE_LAYOUT_RETURN
);
1617 goto out_put_layout_hdr
;
1620 if (pnfs_layoutgets_blocked(lo
)) {
1621 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
,
1622 PNFS_UPDATE_LAYOUT_BLOCKED
);
1625 atomic_inc(&lo
->plh_outstanding
);
1626 spin_unlock(&ino
->i_lock
);
1628 if (list_empty(&lo
->plh_layouts
)) {
1629 /* The lo must be on the clp list if there is any
1630 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1632 spin_lock(&clp
->cl_lock
);
1633 if (list_empty(&lo
->plh_layouts
))
1634 list_add_tail(&lo
->plh_layouts
, &server
->layouts
);
1635 spin_unlock(&clp
->cl_lock
);
1638 pg_offset
= arg
.offset
& ~PAGE_MASK
;
1640 arg
.offset
-= pg_offset
;
1641 arg
.length
+= pg_offset
;
1643 if (arg
.length
!= NFS4_MAX_UINT64
)
1644 arg
.length
= PAGE_ALIGN(arg
.length
);
1646 lseg
= send_layoutget(lo
, ctx
, &arg
, gfp_flags
);
1647 atomic_dec(&lo
->plh_outstanding
);
1648 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
,
1649 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET
);
1652 pnfs_clear_first_layoutget(lo
);
1653 pnfs_put_layout_hdr(lo
);
1655 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1656 "(%s, offset: %llu, length: %llu)\n",
1657 __func__
, ino
->i_sb
->s_id
,
1658 (unsigned long long)NFS_FILEID(ino
),
1659 IS_ERR_OR_NULL(lseg
) ? "not found" : "found",
1660 iomode
==IOMODE_RW
? "read/write" : "read-only",
1661 (unsigned long long)pos
,
1662 (unsigned long long)count
);
1665 spin_unlock(&ino
->i_lock
);
1666 goto out_put_layout_hdr
;
1668 EXPORT_SYMBOL_GPL(pnfs_update_layout
);
1671 pnfs_sanity_check_layout_range(struct pnfs_layout_range
*range
)
1673 switch (range
->iomode
) {
1680 if (range
->offset
== NFS4_MAX_UINT64
)
1682 if (range
->length
== 0)
1684 if (range
->length
!= NFS4_MAX_UINT64
&&
1685 range
->length
> NFS4_MAX_UINT64
- range
->offset
)
1690 struct pnfs_layout_segment
*
1691 pnfs_layout_process(struct nfs4_layoutget
*lgp
)
1693 struct pnfs_layout_hdr
*lo
= NFS_I(lgp
->args
.inode
)->layout
;
1694 struct nfs4_layoutget_res
*res
= &lgp
->res
;
1695 struct pnfs_layout_segment
*lseg
;
1696 struct inode
*ino
= lo
->plh_inode
;
1698 int status
= -EINVAL
;
1700 if (!pnfs_sanity_check_layout_range(&res
->range
))
1703 /* Inject layout blob into I/O device driver */
1704 lseg
= NFS_SERVER(ino
)->pnfs_curr_ld
->alloc_lseg(lo
, res
, lgp
->gfp_flags
);
1705 if (!lseg
|| IS_ERR(lseg
)) {
1709 status
= PTR_ERR(lseg
);
1710 dprintk("%s: Could not allocate layout: error %d\n",
1715 init_lseg(lo
, lseg
);
1716 lseg
->pls_range
= res
->range
;
1717 lseg
->pls_seq
= be32_to_cpu(res
->stateid
.seqid
);
1719 spin_lock(&ino
->i_lock
);
1720 if (pnfs_layoutgets_blocked(lo
)) {
1721 dprintk("%s forget reply due to state\n", __func__
);
1722 goto out_forget_reply
;
1725 if (nfs4_stateid_match_other(&lo
->plh_stateid
, &res
->stateid
)) {
1726 /* existing state ID, make sure the sequence number matches. */
1727 if (pnfs_layout_stateid_blocked(lo
, &res
->stateid
)) {
1728 dprintk("%s forget reply due to sequence\n", __func__
);
1730 goto out_forget_reply
;
1732 pnfs_set_layout_stateid(lo
, &res
->stateid
, false);
1735 * We got an entirely new state ID. Mark all segments for the
1736 * inode invalid, and don't bother validating the stateid
1739 pnfs_mark_matching_lsegs_invalid(lo
, &free_me
, NULL
, 0);
1741 nfs4_stateid_copy(&lo
->plh_stateid
, &res
->stateid
);
1742 lo
->plh_barrier
= be32_to_cpu(res
->stateid
.seqid
);
1745 clear_bit(NFS_LAYOUT_INVALID_STID
, &lo
->plh_flags
);
1747 pnfs_get_lseg(lseg
);
1748 pnfs_layout_insert_lseg(lo
, lseg
, &free_me
);
1750 if (res
->return_on_close
)
1751 set_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
);
1753 spin_unlock(&ino
->i_lock
);
1754 pnfs_free_lseg_list(&free_me
);
1757 return ERR_PTR(status
);
1760 spin_unlock(&ino
->i_lock
);
1761 lseg
->pls_layout
= lo
;
1762 NFS_SERVER(ino
)->pnfs_curr_ld
->free_lseg(lseg
);
1767 pnfs_set_plh_return_info(struct pnfs_layout_hdr
*lo
, enum pnfs_iomode iomode
,
1770 if (lo
->plh_return_iomode
== iomode
)
1772 if (lo
->plh_return_iomode
!= 0)
1773 iomode
= IOMODE_ANY
;
1774 lo
->plh_return_iomode
= iomode
;
1775 set_bit(NFS_LAYOUT_RETURN_REQUESTED
, &lo
->plh_flags
);
1776 if (!lo
->plh_return_seq
|| pnfs_seqid_is_newer(seq
, lo
->plh_return_seq
))
1777 lo
->plh_return_seq
= seq
;
1781 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
1782 * @lo: pointer to layout header
1783 * @tmp_list: list header to be used with pnfs_free_lseg_list()
1784 * @return_range: describe layout segment ranges to be returned
1786 * This function is mainly intended for use by layoutrecall. It attempts
1787 * to free the layout segment immediately, or else to mark it for return
1788 * as soon as its reference count drops to zero.
1791 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr
*lo
,
1792 struct list_head
*tmp_list
,
1793 const struct pnfs_layout_range
*return_range
,
1796 struct pnfs_layout_segment
*lseg
, *next
;
1799 dprintk("%s:Begin lo %p\n", __func__
, lo
);
1801 if (list_empty(&lo
->plh_segs
))
1804 assert_spin_locked(&lo
->plh_inode
->i_lock
);
1806 list_for_each_entry_safe(lseg
, next
, &lo
->plh_segs
, pls_list
)
1807 if (should_free_lseg(&lseg
->pls_range
, return_range
)) {
1808 dprintk("%s: marking lseg %p iomode %d "
1809 "offset %llu length %llu\n", __func__
,
1810 lseg
, lseg
->pls_range
.iomode
,
1811 lseg
->pls_range
.offset
,
1812 lseg
->pls_range
.length
);
1813 if (mark_lseg_invalid(lseg
, tmp_list
))
1816 set_bit(NFS_LSEG_LAYOUTRETURN
, &lseg
->pls_flags
);
1820 pnfs_set_plh_return_info(lo
, return_range
->iomode
, seq
);
1825 void pnfs_error_mark_layout_for_return(struct inode
*inode
,
1826 struct pnfs_layout_segment
*lseg
)
1828 struct pnfs_layout_hdr
*lo
= NFS_I(inode
)->layout
;
1829 struct pnfs_layout_range range
= {
1830 .iomode
= lseg
->pls_range
.iomode
,
1832 .length
= NFS4_MAX_UINT64
,
1835 bool return_now
= false;
1837 spin_lock(&inode
->i_lock
);
1838 pnfs_set_plh_return_info(lo
, range
.iomode
, lseg
->pls_seq
);
1840 * mark all matching lsegs so that we are sure to have no live
1841 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
1844 if (!pnfs_mark_matching_lsegs_return(lo
, &free_me
,
1845 &range
, lseg
->pls_seq
)) {
1846 nfs4_stateid stateid
;
1847 enum pnfs_iomode iomode
= lo
->plh_return_iomode
;
1849 nfs4_stateid_copy(&stateid
, &lo
->plh_stateid
);
1850 return_now
= pnfs_prepare_layoutreturn(lo
);
1851 spin_unlock(&inode
->i_lock
);
1853 pnfs_send_layoutreturn(lo
, &stateid
, iomode
, false);
1855 spin_unlock(&inode
->i_lock
);
1856 nfs_commit_inode(inode
, 0);
1858 pnfs_free_lseg_list(&free_me
);
1860 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return
);
1863 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*req
)
1865 u64 rd_size
= req
->wb_bytes
;
1867 if (pgio
->pg_lseg
== NULL
) {
1868 if (pgio
->pg_dreq
== NULL
)
1869 rd_size
= i_size_read(pgio
->pg_inode
) - req_offset(req
);
1871 rd_size
= nfs_dreq_bytes_left(pgio
->pg_dreq
);
1873 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
1879 if (IS_ERR(pgio
->pg_lseg
)) {
1880 pgio
->pg_error
= PTR_ERR(pgio
->pg_lseg
);
1881 pgio
->pg_lseg
= NULL
;
1885 /* If no lseg, fall back to read through mds */
1886 if (pgio
->pg_lseg
== NULL
)
1887 nfs_pageio_reset_read_mds(pgio
);
1890 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read
);
1893 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor
*pgio
,
1894 struct nfs_page
*req
, u64 wb_size
)
1896 if (pgio
->pg_lseg
== NULL
) {
1897 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
1903 if (IS_ERR(pgio
->pg_lseg
)) {
1904 pgio
->pg_error
= PTR_ERR(pgio
->pg_lseg
);
1905 pgio
->pg_lseg
= NULL
;
1909 /* If no lseg, fall back to write through mds */
1910 if (pgio
->pg_lseg
== NULL
)
1911 nfs_pageio_reset_write_mds(pgio
);
1913 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write
);
1916 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor
*desc
)
1918 if (desc
->pg_lseg
) {
1919 pnfs_put_lseg(desc
->pg_lseg
);
1920 desc
->pg_lseg
= NULL
;
1923 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup
);
1926 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
1927 * of bytes (maximum @req->wb_bytes) that can be coalesced.
1930 pnfs_generic_pg_test(struct nfs_pageio_descriptor
*pgio
,
1931 struct nfs_page
*prev
, struct nfs_page
*req
)
1934 u64 seg_end
, req_start
, seg_left
;
1936 size
= nfs_generic_pg_test(pgio
, prev
, req
);
1941 * 'size' contains the number of bytes left in the current page (up
1942 * to the original size asked for in @req->wb_bytes).
1944 * Calculate how many bytes are left in the layout segment
1945 * and if there are less bytes than 'size', return that instead.
1947 * Please also note that 'end_offset' is actually the offset of the
1948 * first byte that lies outside the pnfs_layout_range. FIXME?
1951 if (pgio
->pg_lseg
) {
1952 seg_end
= end_offset(pgio
->pg_lseg
->pls_range
.offset
,
1953 pgio
->pg_lseg
->pls_range
.length
);
1954 req_start
= req_offset(req
);
1955 WARN_ON_ONCE(req_start
>= seg_end
);
1956 /* start of request is past the last byte of this segment */
1957 if (req_start
>= seg_end
) {
1958 /* reference the new lseg */
1959 if (pgio
->pg_ops
->pg_cleanup
)
1960 pgio
->pg_ops
->pg_cleanup(pgio
);
1961 if (pgio
->pg_ops
->pg_init
)
1962 pgio
->pg_ops
->pg_init(pgio
, req
);
1966 /* adjust 'size' iff there are fewer bytes left in the
1967 * segment than what nfs_generic_pg_test returned */
1968 seg_left
= seg_end
- req_start
;
1969 if (seg_left
< size
)
1970 size
= (unsigned int)seg_left
;
1975 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test
);
1977 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header
*hdr
)
1979 struct nfs_pageio_descriptor pgio
;
1981 /* Resend all requests through the MDS */
1982 nfs_pageio_init_write(&pgio
, hdr
->inode
, FLUSH_STABLE
, true,
1983 hdr
->completion_ops
);
1984 set_bit(NFS_CONTEXT_RESEND_WRITES
, &hdr
->args
.context
->flags
);
1985 return nfs_pageio_resend(&pgio
, hdr
);
1987 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds
);
1989 static void pnfs_ld_handle_write_error(struct nfs_pgio_header
*hdr
)
1992 dprintk("pnfs write error = %d\n", hdr
->pnfs_error
);
1993 if (NFS_SERVER(hdr
->inode
)->pnfs_curr_ld
->flags
&
1994 PNFS_LAYOUTRET_ON_ERROR
) {
1995 pnfs_return_layout(hdr
->inode
);
1997 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
))
1998 hdr
->task
.tk_status
= pnfs_write_done_resend_to_mds(hdr
);
2002 * Called by non rpc-based layout drivers
2004 void pnfs_ld_write_done(struct nfs_pgio_header
*hdr
)
2006 if (likely(!hdr
->pnfs_error
)) {
2007 pnfs_set_layoutcommit(hdr
->inode
, hdr
->lseg
,
2008 hdr
->mds_offset
+ hdr
->res
.count
);
2009 hdr
->mds_ops
->rpc_call_done(&hdr
->task
, hdr
);
2011 trace_nfs4_pnfs_write(hdr
, hdr
->pnfs_error
);
2012 if (unlikely(hdr
->pnfs_error
))
2013 pnfs_ld_handle_write_error(hdr
);
2014 hdr
->mds_ops
->rpc_release(hdr
);
2016 EXPORT_SYMBOL_GPL(pnfs_ld_write_done
);
2019 pnfs_write_through_mds(struct nfs_pageio_descriptor
*desc
,
2020 struct nfs_pgio_header
*hdr
)
2022 struct nfs_pgio_mirror
*mirror
= nfs_pgio_current_mirror(desc
);
2024 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
2025 list_splice_tail_init(&hdr
->pages
, &mirror
->pg_list
);
2026 nfs_pageio_reset_write_mds(desc
);
2027 mirror
->pg_recoalesce
= 1;
2029 nfs_pgio_data_destroy(hdr
);
2033 static enum pnfs_try_status
2034 pnfs_try_to_write_data(struct nfs_pgio_header
*hdr
,
2035 const struct rpc_call_ops
*call_ops
,
2036 struct pnfs_layout_segment
*lseg
,
2039 struct inode
*inode
= hdr
->inode
;
2040 enum pnfs_try_status trypnfs
;
2041 struct nfs_server
*nfss
= NFS_SERVER(inode
);
2043 hdr
->mds_ops
= call_ops
;
2045 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__
,
2046 inode
->i_ino
, hdr
->args
.count
, hdr
->args
.offset
, how
);
2047 trypnfs
= nfss
->pnfs_curr_ld
->write_pagelist(hdr
, how
);
2048 if (trypnfs
!= PNFS_NOT_ATTEMPTED
)
2049 nfs_inc_stats(inode
, NFSIOS_PNFS_WRITE
);
2050 dprintk("%s End (trypnfs:%d)\n", __func__
, trypnfs
);
2055 pnfs_do_write(struct nfs_pageio_descriptor
*desc
,
2056 struct nfs_pgio_header
*hdr
, int how
)
2058 const struct rpc_call_ops
*call_ops
= desc
->pg_rpc_callops
;
2059 struct pnfs_layout_segment
*lseg
= desc
->pg_lseg
;
2060 enum pnfs_try_status trypnfs
;
2062 trypnfs
= pnfs_try_to_write_data(hdr
, call_ops
, lseg
, how
);
2063 if (trypnfs
== PNFS_NOT_ATTEMPTED
)
2064 pnfs_write_through_mds(desc
, hdr
);
2067 static void pnfs_writehdr_free(struct nfs_pgio_header
*hdr
)
2069 pnfs_put_lseg(hdr
->lseg
);
2070 nfs_pgio_header_free(hdr
);
2074 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor
*desc
)
2076 struct nfs_pgio_header
*hdr
;
2079 hdr
= nfs_pgio_header_alloc(desc
->pg_rw_ops
);
2081 desc
->pg_error
= -ENOMEM
;
2082 return desc
->pg_error
;
2084 nfs_pgheader_init(desc
, hdr
, pnfs_writehdr_free
);
2086 hdr
->lseg
= pnfs_get_lseg(desc
->pg_lseg
);
2087 ret
= nfs_generic_pgio(desc
, hdr
);
2089 pnfs_do_write(desc
, hdr
, desc
->pg_ioflags
);
2093 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages
);
2095 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header
*hdr
)
2097 struct nfs_pageio_descriptor pgio
;
2099 /* Resend all requests through the MDS */
2100 nfs_pageio_init_read(&pgio
, hdr
->inode
, true, hdr
->completion_ops
);
2101 return nfs_pageio_resend(&pgio
, hdr
);
2103 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds
);
2105 static void pnfs_ld_handle_read_error(struct nfs_pgio_header
*hdr
)
2107 dprintk("pnfs read error = %d\n", hdr
->pnfs_error
);
2108 if (NFS_SERVER(hdr
->inode
)->pnfs_curr_ld
->flags
&
2109 PNFS_LAYOUTRET_ON_ERROR
) {
2110 pnfs_return_layout(hdr
->inode
);
2112 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
))
2113 hdr
->task
.tk_status
= pnfs_read_done_resend_to_mds(hdr
);
2117 * Called by non rpc-based layout drivers
2119 void pnfs_ld_read_done(struct nfs_pgio_header
*hdr
)
2121 if (likely(!hdr
->pnfs_error
)) {
2122 __nfs4_read_done_cb(hdr
);
2123 hdr
->mds_ops
->rpc_call_done(&hdr
->task
, hdr
);
2125 trace_nfs4_pnfs_read(hdr
, hdr
->pnfs_error
);
2126 if (unlikely(hdr
->pnfs_error
))
2127 pnfs_ld_handle_read_error(hdr
);
2128 hdr
->mds_ops
->rpc_release(hdr
);
2130 EXPORT_SYMBOL_GPL(pnfs_ld_read_done
);
2133 pnfs_read_through_mds(struct nfs_pageio_descriptor
*desc
,
2134 struct nfs_pgio_header
*hdr
)
2136 struct nfs_pgio_mirror
*mirror
= nfs_pgio_current_mirror(desc
);
2138 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
2139 list_splice_tail_init(&hdr
->pages
, &mirror
->pg_list
);
2140 nfs_pageio_reset_read_mds(desc
);
2141 mirror
->pg_recoalesce
= 1;
2143 nfs_pgio_data_destroy(hdr
);
2148 * Call the appropriate parallel I/O subsystem read function.
2150 static enum pnfs_try_status
2151 pnfs_try_to_read_data(struct nfs_pgio_header
*hdr
,
2152 const struct rpc_call_ops
*call_ops
,
2153 struct pnfs_layout_segment
*lseg
)
2155 struct inode
*inode
= hdr
->inode
;
2156 struct nfs_server
*nfss
= NFS_SERVER(inode
);
2157 enum pnfs_try_status trypnfs
;
2159 hdr
->mds_ops
= call_ops
;
2161 dprintk("%s: Reading ino:%lu %u@%llu\n",
2162 __func__
, inode
->i_ino
, hdr
->args
.count
, hdr
->args
.offset
);
2164 trypnfs
= nfss
->pnfs_curr_ld
->read_pagelist(hdr
);
2165 if (trypnfs
!= PNFS_NOT_ATTEMPTED
)
2166 nfs_inc_stats(inode
, NFSIOS_PNFS_READ
);
2167 dprintk("%s End (trypnfs:%d)\n", __func__
, trypnfs
);
2171 /* Resend all requests through pnfs. */
2172 void pnfs_read_resend_pnfs(struct nfs_pgio_header
*hdr
)
2174 struct nfs_pageio_descriptor pgio
;
2176 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
2177 nfs_pageio_init_read(&pgio
, hdr
->inode
, false,
2178 hdr
->completion_ops
);
2179 hdr
->task
.tk_status
= nfs_pageio_resend(&pgio
, hdr
);
2182 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs
);
2185 pnfs_do_read(struct nfs_pageio_descriptor
*desc
, struct nfs_pgio_header
*hdr
)
2187 const struct rpc_call_ops
*call_ops
= desc
->pg_rpc_callops
;
2188 struct pnfs_layout_segment
*lseg
= desc
->pg_lseg
;
2189 enum pnfs_try_status trypnfs
;
2191 trypnfs
= pnfs_try_to_read_data(hdr
, call_ops
, lseg
);
2192 if (trypnfs
== PNFS_TRY_AGAIN
)
2193 pnfs_read_resend_pnfs(hdr
);
2194 if (trypnfs
== PNFS_NOT_ATTEMPTED
|| hdr
->task
.tk_status
)
2195 pnfs_read_through_mds(desc
, hdr
);
2198 static void pnfs_readhdr_free(struct nfs_pgio_header
*hdr
)
2200 pnfs_put_lseg(hdr
->lseg
);
2201 nfs_pgio_header_free(hdr
);
2205 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor
*desc
)
2207 struct nfs_pgio_header
*hdr
;
2210 hdr
= nfs_pgio_header_alloc(desc
->pg_rw_ops
);
2212 desc
->pg_error
= -ENOMEM
;
2213 return desc
->pg_error
;
2215 nfs_pgheader_init(desc
, hdr
, pnfs_readhdr_free
);
2216 hdr
->lseg
= pnfs_get_lseg(desc
->pg_lseg
);
2217 ret
= nfs_generic_pgio(desc
, hdr
);
2219 pnfs_do_read(desc
, hdr
);
2222 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages
);
2224 static void pnfs_clear_layoutcommitting(struct inode
*inode
)
2226 unsigned long *bitlock
= &NFS_I(inode
)->flags
;
2228 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING
, bitlock
);
2229 smp_mb__after_atomic();
2230 wake_up_bit(bitlock
, NFS_INO_LAYOUTCOMMITTING
);
2234 * There can be multiple RW segments.
2236 static void pnfs_list_write_lseg(struct inode
*inode
, struct list_head
*listp
)
2238 struct pnfs_layout_segment
*lseg
;
2240 list_for_each_entry(lseg
, &NFS_I(inode
)->layout
->plh_segs
, pls_list
) {
2241 if (lseg
->pls_range
.iomode
== IOMODE_RW
&&
2242 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
))
2243 list_add(&lseg
->pls_lc_list
, listp
);
2247 static void pnfs_list_write_lseg_done(struct inode
*inode
, struct list_head
*listp
)
2249 struct pnfs_layout_segment
*lseg
, *tmp
;
2251 /* Matched by references in pnfs_set_layoutcommit */
2252 list_for_each_entry_safe(lseg
, tmp
, listp
, pls_lc_list
) {
2253 list_del_init(&lseg
->pls_lc_list
);
2254 pnfs_put_lseg(lseg
);
2257 pnfs_clear_layoutcommitting(inode
);
2260 void pnfs_set_lo_fail(struct pnfs_layout_segment
*lseg
)
2262 pnfs_layout_io_set_failed(lseg
->pls_layout
, lseg
->pls_range
.iomode
);
2264 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail
);
2267 pnfs_set_layoutcommit(struct inode
*inode
, struct pnfs_layout_segment
*lseg
,
2270 struct nfs_inode
*nfsi
= NFS_I(inode
);
2271 bool mark_as_dirty
= false;
2273 spin_lock(&inode
->i_lock
);
2274 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
)) {
2275 nfsi
->layout
->plh_lwb
= end_pos
;
2276 mark_as_dirty
= true;
2277 dprintk("%s: Set layoutcommit for inode %lu ",
2278 __func__
, inode
->i_ino
);
2279 } else if (end_pos
> nfsi
->layout
->plh_lwb
)
2280 nfsi
->layout
->plh_lwb
= end_pos
;
2281 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
)) {
2282 /* references matched in nfs4_layoutcommit_release */
2283 pnfs_get_lseg(lseg
);
2285 spin_unlock(&inode
->i_lock
);
2286 dprintk("%s: lseg %p end_pos %llu\n",
2287 __func__
, lseg
, nfsi
->layout
->plh_lwb
);
2289 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2290 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2292 mark_inode_dirty_sync(inode
);
2294 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit
);
2296 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data
*data
)
2298 struct nfs_server
*nfss
= NFS_SERVER(data
->args
.inode
);
2300 if (nfss
->pnfs_curr_ld
->cleanup_layoutcommit
)
2301 nfss
->pnfs_curr_ld
->cleanup_layoutcommit(data
);
2302 pnfs_list_write_lseg_done(data
->args
.inode
, &data
->lseg_list
);
2306 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
2307 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
2308 * data to disk to allow the server to recover the data if it crashes.
2309 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
2310 * is off, and a COMMIT is sent to a data server, or
2311 * if WRITEs to a data server return NFS_DATA_SYNC.
2314 pnfs_layoutcommit_inode(struct inode
*inode
, bool sync
)
2316 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(inode
)->pnfs_curr_ld
;
2317 struct nfs4_layoutcommit_data
*data
;
2318 struct nfs_inode
*nfsi
= NFS_I(inode
);
2322 if (!pnfs_layoutcommit_outstanding(inode
))
2325 dprintk("--> %s inode %lu\n", __func__
, inode
->i_ino
);
2328 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING
, &nfsi
->flags
)) {
2331 status
= wait_on_bit_lock_action(&nfsi
->flags
,
2332 NFS_INO_LAYOUTCOMMITTING
,
2333 nfs_wait_bit_killable
,
2340 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
2341 data
= kzalloc(sizeof(*data
), GFP_NOFS
);
2343 goto clear_layoutcommitting
;
2346 spin_lock(&inode
->i_lock
);
2347 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
))
2350 INIT_LIST_HEAD(&data
->lseg_list
);
2351 pnfs_list_write_lseg(inode
, &data
->lseg_list
);
2353 end_pos
= nfsi
->layout
->plh_lwb
;
2355 nfs4_stateid_copy(&data
->args
.stateid
, &nfsi
->layout
->plh_stateid
);
2356 spin_unlock(&inode
->i_lock
);
2358 data
->args
.inode
= inode
;
2359 data
->cred
= get_rpccred(nfsi
->layout
->plh_lc_cred
);
2360 nfs_fattr_init(&data
->fattr
);
2361 data
->args
.bitmask
= NFS_SERVER(inode
)->cache_consistency_bitmask
;
2362 data
->res
.fattr
= &data
->fattr
;
2363 data
->args
.lastbytewritten
= end_pos
- 1;
2364 data
->res
.server
= NFS_SERVER(inode
);
2366 if (ld
->prepare_layoutcommit
) {
2367 status
= ld
->prepare_layoutcommit(&data
->args
);
2369 put_rpccred(data
->cred
);
2370 spin_lock(&inode
->i_lock
);
2371 set_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
);
2372 if (end_pos
> nfsi
->layout
->plh_lwb
)
2373 nfsi
->layout
->plh_lwb
= end_pos
;
2379 status
= nfs4_proc_layoutcommit(data
, sync
);
2382 mark_inode_dirty_sync(inode
);
2383 dprintk("<-- %s status %d\n", __func__
, status
);
2386 spin_unlock(&inode
->i_lock
);
2388 clear_layoutcommitting
:
2389 pnfs_clear_layoutcommitting(inode
);
2392 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode
);
2395 pnfs_generic_sync(struct inode
*inode
, bool datasync
)
2397 return pnfs_layoutcommit_inode(inode
, true);
2399 EXPORT_SYMBOL_GPL(pnfs_generic_sync
);
2401 struct nfs4_threshold
*pnfs_mdsthreshold_alloc(void)
2403 struct nfs4_threshold
*thp
;
2405 thp
= kzalloc(sizeof(*thp
), GFP_NOFS
);
2407 dprintk("%s mdsthreshold allocation failed\n", __func__
);
2413 #if IS_ENABLED(CONFIG_NFS_V4_2)
2415 pnfs_report_layoutstat(struct inode
*inode
, gfp_t gfp_flags
)
2417 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(inode
)->pnfs_curr_ld
;
2418 struct nfs_server
*server
= NFS_SERVER(inode
);
2419 struct nfs_inode
*nfsi
= NFS_I(inode
);
2420 struct nfs42_layoutstat_data
*data
;
2421 struct pnfs_layout_hdr
*hdr
;
2424 if (!pnfs_enabled_sb(server
) || !ld
->prepare_layoutstats
)
2427 if (!nfs_server_capable(inode
, NFS_CAP_LAYOUTSTATS
))
2430 if (test_and_set_bit(NFS_INO_LAYOUTSTATS
, &nfsi
->flags
))
2433 spin_lock(&inode
->i_lock
);
2434 if (!NFS_I(inode
)->layout
) {
2435 spin_unlock(&inode
->i_lock
);
2436 goto out_clear_layoutstats
;
2438 hdr
= NFS_I(inode
)->layout
;
2439 pnfs_get_layout_hdr(hdr
);
2440 spin_unlock(&inode
->i_lock
);
2442 data
= kzalloc(sizeof(*data
), gfp_flags
);
2448 data
->args
.fh
= NFS_FH(inode
);
2449 data
->args
.inode
= inode
;
2450 nfs4_stateid_copy(&data
->args
.stateid
, &hdr
->plh_stateid
);
2451 status
= ld
->prepare_layoutstats(&data
->args
);
2455 status
= nfs42_proc_layoutstats_generic(NFS_SERVER(inode
), data
);
2458 dprintk("%s returns %d\n", __func__
, status
);
2464 pnfs_put_layout_hdr(hdr
);
2465 out_clear_layoutstats
:
2466 smp_mb__before_atomic();
2467 clear_bit(NFS_INO_LAYOUTSTATS
, &nfsi
->flags
);
2468 smp_mb__after_atomic();
2471 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat
);
2474 unsigned int layoutstats_timer
;
2475 module_param(layoutstats_timer
, uint
, 0644);
2476 EXPORT_SYMBOL_GPL(layoutstats_timer
);