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
);
56 pnfs_send_layoutreturn(struct pnfs_layout_hdr
*lo
, nfs4_stateid stateid
,
57 enum pnfs_iomode iomode
, bool sync
);
59 /* Return the registered pnfs layout driver module matching given id */
60 static struct pnfs_layoutdriver_type
*
61 find_pnfs_driver_locked(u32 id
)
63 struct pnfs_layoutdriver_type
*local
;
65 list_for_each_entry(local
, &pnfs_modules_tbl
, pnfs_tblid
)
70 dprintk("%s: Searching for id %u, found %p\n", __func__
, id
, local
);
74 static struct pnfs_layoutdriver_type
*
75 find_pnfs_driver(u32 id
)
77 struct pnfs_layoutdriver_type
*local
;
79 spin_lock(&pnfs_spinlock
);
80 local
= find_pnfs_driver_locked(id
);
81 if (local
!= NULL
&& !try_module_get(local
->owner
)) {
82 dprintk("%s: Could not grab reference on module\n", __func__
);
85 spin_unlock(&pnfs_spinlock
);
90 unset_pnfs_layoutdriver(struct nfs_server
*nfss
)
92 if (nfss
->pnfs_curr_ld
) {
93 if (nfss
->pnfs_curr_ld
->clear_layoutdriver
)
94 nfss
->pnfs_curr_ld
->clear_layoutdriver(nfss
);
95 /* Decrement the MDS count. Purge the deviceid cache if zero */
96 if (atomic_dec_and_test(&nfss
->nfs_client
->cl_mds_count
))
97 nfs4_deviceid_purge_client(nfss
->nfs_client
);
98 module_put(nfss
->pnfs_curr_ld
->owner
);
100 nfss
->pnfs_curr_ld
= NULL
;
104 * Try to set the server's pnfs module to the pnfs layout type specified by id.
105 * Currently only one pNFS layout driver per filesystem is supported.
107 * @id layout type. Zero (illegal layout type) indicates pNFS not in use.
110 set_pnfs_layoutdriver(struct nfs_server
*server
, const struct nfs_fh
*mntfh
,
113 struct pnfs_layoutdriver_type
*ld_type
= NULL
;
117 if (!(server
->nfs_client
->cl_exchange_flags
&
118 (EXCHGID4_FLAG_USE_NON_PNFS
| EXCHGID4_FLAG_USE_PNFS_MDS
))) {
119 printk(KERN_ERR
"NFS: %s: id %u cl_exchange_flags 0x%x\n",
120 __func__
, id
, server
->nfs_client
->cl_exchange_flags
);
123 ld_type
= find_pnfs_driver(id
);
125 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX
, id
);
126 ld_type
= find_pnfs_driver(id
);
128 dprintk("%s: No pNFS module found for %u.\n",
133 server
->pnfs_curr_ld
= ld_type
;
134 if (ld_type
->set_layoutdriver
135 && ld_type
->set_layoutdriver(server
, mntfh
)) {
136 printk(KERN_ERR
"NFS: %s: Error initializing pNFS layout "
137 "driver %u.\n", __func__
, id
);
138 module_put(ld_type
->owner
);
141 /* Bump the MDS count */
142 atomic_inc(&server
->nfs_client
->cl_mds_count
);
144 dprintk("%s: pNFS module for %u set\n", __func__
, id
);
148 dprintk("%s: Using NFSv4 I/O\n", __func__
);
149 server
->pnfs_curr_ld
= NULL
;
153 pnfs_register_layoutdriver(struct pnfs_layoutdriver_type
*ld_type
)
155 int status
= -EINVAL
;
156 struct pnfs_layoutdriver_type
*tmp
;
158 if (ld_type
->id
== 0) {
159 printk(KERN_ERR
"NFS: %s id 0 is reserved\n", __func__
);
162 if (!ld_type
->alloc_lseg
|| !ld_type
->free_lseg
) {
163 printk(KERN_ERR
"NFS: %s Layout driver must provide "
164 "alloc_lseg and free_lseg.\n", __func__
);
168 spin_lock(&pnfs_spinlock
);
169 tmp
= find_pnfs_driver_locked(ld_type
->id
);
171 list_add(&ld_type
->pnfs_tblid
, &pnfs_modules_tbl
);
173 dprintk("%s Registering id:%u name:%s\n", __func__
, ld_type
->id
,
176 printk(KERN_ERR
"NFS: %s Module with id %d already loaded!\n",
177 __func__
, ld_type
->id
);
179 spin_unlock(&pnfs_spinlock
);
183 EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver
);
186 pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type
*ld_type
)
188 dprintk("%s Deregistering id:%u\n", __func__
, ld_type
->id
);
189 spin_lock(&pnfs_spinlock
);
190 list_del(&ld_type
->pnfs_tblid
);
191 spin_unlock(&pnfs_spinlock
);
193 EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver
);
196 * pNFS client layout cache
199 /* Need to hold i_lock if caller does not already hold reference */
201 pnfs_get_layout_hdr(struct pnfs_layout_hdr
*lo
)
203 atomic_inc(&lo
->plh_refcount
);
206 static struct pnfs_layout_hdr
*
207 pnfs_alloc_layout_hdr(struct inode
*ino
, gfp_t gfp_flags
)
209 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(ino
)->pnfs_curr_ld
;
210 return ld
->alloc_layout_hdr(ino
, gfp_flags
);
214 pnfs_free_layout_hdr(struct pnfs_layout_hdr
*lo
)
216 struct nfs_server
*server
= NFS_SERVER(lo
->plh_inode
);
217 struct pnfs_layoutdriver_type
*ld
= server
->pnfs_curr_ld
;
219 if (!list_empty(&lo
->plh_layouts
)) {
220 struct nfs_client
*clp
= server
->nfs_client
;
222 spin_lock(&clp
->cl_lock
);
223 list_del_init(&lo
->plh_layouts
);
224 spin_unlock(&clp
->cl_lock
);
226 put_rpccred(lo
->plh_lc_cred
);
227 return ld
->free_layout_hdr(lo
);
231 pnfs_detach_layout_hdr(struct pnfs_layout_hdr
*lo
)
233 struct nfs_inode
*nfsi
= NFS_I(lo
->plh_inode
);
234 dprintk("%s: freeing layout cache %p\n", __func__
, lo
);
236 /* Reset MDS Threshold I/O counters */
242 pnfs_put_layout_hdr(struct pnfs_layout_hdr
*lo
)
244 struct inode
*inode
= lo
->plh_inode
;
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 pnfs_iomode_to_fail_bit(u32 iomode
)
258 return iomode
== IOMODE_RW
?
259 NFS_LAYOUT_RW_FAILED
: NFS_LAYOUT_RO_FAILED
;
263 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr
*lo
, int fail_bit
)
265 lo
->plh_retry_timestamp
= jiffies
;
266 if (!test_and_set_bit(fail_bit
, &lo
->plh_flags
))
267 atomic_inc(&lo
->plh_refcount
);
271 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr
*lo
, int fail_bit
)
273 if (test_and_clear_bit(fail_bit
, &lo
->plh_flags
))
274 atomic_dec(&lo
->plh_refcount
);
278 pnfs_layout_io_set_failed(struct pnfs_layout_hdr
*lo
, u32 iomode
)
280 struct inode
*inode
= lo
->plh_inode
;
281 struct pnfs_layout_range range
= {
284 .length
= NFS4_MAX_UINT64
,
288 spin_lock(&inode
->i_lock
);
289 pnfs_layout_set_fail_bit(lo
, pnfs_iomode_to_fail_bit(iomode
));
290 pnfs_mark_matching_lsegs_invalid(lo
, &head
, &range
);
291 spin_unlock(&inode
->i_lock
);
292 pnfs_free_lseg_list(&head
);
293 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__
,
294 iomode
== IOMODE_RW
? "RW" : "READ");
298 pnfs_layout_io_test_failed(struct pnfs_layout_hdr
*lo
, u32 iomode
)
300 unsigned long start
, end
;
301 int fail_bit
= pnfs_iomode_to_fail_bit(iomode
);
303 if (test_bit(fail_bit
, &lo
->plh_flags
) == 0)
306 start
= end
- PNFS_LAYOUTGET_RETRY_TIMEOUT
;
307 if (!time_in_range(lo
->plh_retry_timestamp
, start
, end
)) {
308 /* It is time to retry the failed layoutgets */
309 pnfs_layout_clear_fail_bit(lo
, fail_bit
);
316 init_lseg(struct pnfs_layout_hdr
*lo
, struct pnfs_layout_segment
*lseg
)
318 INIT_LIST_HEAD(&lseg
->pls_list
);
319 INIT_LIST_HEAD(&lseg
->pls_lc_list
);
320 atomic_set(&lseg
->pls_refcount
, 1);
322 set_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
);
323 lseg
->pls_layout
= lo
;
326 static void pnfs_free_lseg(struct pnfs_layout_segment
*lseg
)
328 struct inode
*ino
= lseg
->pls_layout
->plh_inode
;
330 NFS_SERVER(ino
)->pnfs_curr_ld
->free_lseg(lseg
);
334 pnfs_layout_remove_lseg(struct pnfs_layout_hdr
*lo
,
335 struct pnfs_layout_segment
*lseg
)
337 struct inode
*inode
= lo
->plh_inode
;
339 WARN_ON(test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
));
340 list_del_init(&lseg
->pls_list
);
341 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
342 atomic_dec(&lo
->plh_refcount
);
343 if (list_empty(&lo
->plh_segs
))
344 clear_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
);
345 rpc_wake_up(&NFS_SERVER(inode
)->roc_rpcwaitq
);
348 /* Return true if layoutreturn is needed */
350 pnfs_layout_need_return(struct pnfs_layout_hdr
*lo
,
351 struct pnfs_layout_segment
*lseg
)
353 struct pnfs_layout_segment
*s
;
355 if (!test_and_clear_bit(NFS_LSEG_LAYOUTRETURN
, &lseg
->pls_flags
))
358 list_for_each_entry(s
, &lo
->plh_segs
, pls_list
)
359 if (s
!= lseg
&& test_bit(NFS_LSEG_LAYOUTRETURN
, &s
->pls_flags
))
366 pnfs_prepare_layoutreturn(struct pnfs_layout_hdr
*lo
)
368 if (test_and_set_bit(NFS_LAYOUT_RETURN
, &lo
->plh_flags
))
370 lo
->plh_return_iomode
= 0;
371 pnfs_get_layout_hdr(lo
);
372 clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE
, &lo
->plh_flags
);
376 static void pnfs_layoutreturn_before_put_lseg(struct pnfs_layout_segment
*lseg
,
377 struct pnfs_layout_hdr
*lo
, struct inode
*inode
)
379 lo
= lseg
->pls_layout
;
380 inode
= lo
->plh_inode
;
382 spin_lock(&inode
->i_lock
);
383 if (pnfs_layout_need_return(lo
, lseg
)) {
384 nfs4_stateid stateid
;
385 enum pnfs_iomode iomode
;
388 stateid
= lo
->plh_stateid
;
389 iomode
= lo
->plh_return_iomode
;
390 send
= pnfs_prepare_layoutreturn(lo
);
391 spin_unlock(&inode
->i_lock
);
393 /* Send an async layoutreturn so we dont deadlock */
394 pnfs_send_layoutreturn(lo
, stateid
, iomode
, false);
397 spin_unlock(&inode
->i_lock
);
401 pnfs_put_lseg(struct pnfs_layout_segment
*lseg
)
403 struct pnfs_layout_hdr
*lo
;
409 dprintk("%s: lseg %p ref %d valid %d\n", __func__
, lseg
,
410 atomic_read(&lseg
->pls_refcount
),
411 test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
));
413 /* Handle the case where refcount != 1 */
414 if (atomic_add_unless(&lseg
->pls_refcount
, -1, 1))
417 lo
= lseg
->pls_layout
;
418 inode
= lo
->plh_inode
;
419 /* Do we need a layoutreturn? */
420 if (test_bit(NFS_LSEG_LAYOUTRETURN
, &lseg
->pls_flags
))
421 pnfs_layoutreturn_before_put_lseg(lseg
, lo
, inode
);
423 if (atomic_dec_and_lock(&lseg
->pls_refcount
, &inode
->i_lock
)) {
424 if (test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
)) {
425 spin_unlock(&inode
->i_lock
);
428 pnfs_get_layout_hdr(lo
);
429 pnfs_layout_remove_lseg(lo
, lseg
);
430 spin_unlock(&inode
->i_lock
);
431 pnfs_free_lseg(lseg
);
432 pnfs_put_layout_hdr(lo
);
435 EXPORT_SYMBOL_GPL(pnfs_put_lseg
);
437 static void pnfs_free_lseg_async_work(struct work_struct
*work
)
439 struct pnfs_layout_segment
*lseg
;
440 struct pnfs_layout_hdr
*lo
;
442 lseg
= container_of(work
, struct pnfs_layout_segment
, pls_work
);
443 lo
= lseg
->pls_layout
;
445 pnfs_free_lseg(lseg
);
446 pnfs_put_layout_hdr(lo
);
449 static void pnfs_free_lseg_async(struct pnfs_layout_segment
*lseg
)
451 INIT_WORK(&lseg
->pls_work
, pnfs_free_lseg_async_work
);
452 schedule_work(&lseg
->pls_work
);
456 pnfs_put_lseg_locked(struct pnfs_layout_segment
*lseg
)
461 assert_spin_locked(&lseg
->pls_layout
->plh_inode
->i_lock
);
463 dprintk("%s: lseg %p ref %d valid %d\n", __func__
, lseg
,
464 atomic_read(&lseg
->pls_refcount
),
465 test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
));
466 if (atomic_dec_and_test(&lseg
->pls_refcount
)) {
467 struct pnfs_layout_hdr
*lo
= lseg
->pls_layout
;
468 if (test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
))
470 pnfs_get_layout_hdr(lo
);
471 pnfs_layout_remove_lseg(lo
, lseg
);
472 pnfs_free_lseg_async(lseg
);
475 EXPORT_SYMBOL_GPL(pnfs_put_lseg_locked
);
478 end_offset(u64 start
, u64 len
)
483 return end
>= start
? end
: NFS4_MAX_UINT64
;
487 * is l2 fully contained in l1?
489 * [----------------------------------)
494 pnfs_lseg_range_contained(const struct pnfs_layout_range
*l1
,
495 const struct pnfs_layout_range
*l2
)
497 u64 start1
= l1
->offset
;
498 u64 end1
= end_offset(start1
, l1
->length
);
499 u64 start2
= l2
->offset
;
500 u64 end2
= end_offset(start2
, l2
->length
);
502 return (start1
<= start2
) && (end1
>= end2
);
506 * is l1 and l2 intersecting?
508 * [----------------------------------)
513 pnfs_lseg_range_intersecting(const struct pnfs_layout_range
*l1
,
514 const struct pnfs_layout_range
*l2
)
516 u64 start1
= l1
->offset
;
517 u64 end1
= end_offset(start1
, l1
->length
);
518 u64 start2
= l2
->offset
;
519 u64 end2
= end_offset(start2
, l2
->length
);
521 return (end1
== NFS4_MAX_UINT64
|| end1
> start2
) &&
522 (end2
== NFS4_MAX_UINT64
|| end2
> start1
);
526 should_free_lseg(const struct pnfs_layout_range
*lseg_range
,
527 const struct pnfs_layout_range
*recall_range
)
529 return (recall_range
->iomode
== IOMODE_ANY
||
530 lseg_range
->iomode
== recall_range
->iomode
) &&
531 pnfs_lseg_range_intersecting(lseg_range
, recall_range
);
534 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment
*lseg
,
535 struct list_head
*tmp_list
)
537 if (!atomic_dec_and_test(&lseg
->pls_refcount
))
539 pnfs_layout_remove_lseg(lseg
->pls_layout
, lseg
);
540 list_add(&lseg
->pls_list
, tmp_list
);
544 /* Returns 1 if lseg is removed from list, 0 otherwise */
545 static int mark_lseg_invalid(struct pnfs_layout_segment
*lseg
,
546 struct list_head
*tmp_list
)
550 if (test_and_clear_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
)) {
551 /* Remove the reference keeping the lseg in the
552 * list. It will now be removed when all
553 * outstanding io is finished.
555 dprintk("%s: lseg %p ref %d\n", __func__
, lseg
,
556 atomic_read(&lseg
->pls_refcount
));
557 if (pnfs_lseg_dec_and_remove_zero(lseg
, tmp_list
))
563 /* Returns count of number of matching invalid lsegs remaining in list
567 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr
*lo
,
568 struct list_head
*tmp_list
,
569 struct pnfs_layout_range
*recall_range
)
571 struct pnfs_layout_segment
*lseg
, *next
;
572 int invalid
= 0, removed
= 0;
574 dprintk("%s:Begin lo %p\n", __func__
, lo
);
576 if (list_empty(&lo
->plh_segs
))
578 list_for_each_entry_safe(lseg
, next
, &lo
->plh_segs
, pls_list
)
580 should_free_lseg(&lseg
->pls_range
, recall_range
)) {
581 dprintk("%s: freeing lseg %p iomode %d "
582 "offset %llu length %llu\n", __func__
,
583 lseg
, lseg
->pls_range
.iomode
, lseg
->pls_range
.offset
,
584 lseg
->pls_range
.length
);
586 removed
+= mark_lseg_invalid(lseg
, tmp_list
);
588 dprintk("%s:Return %i\n", __func__
, invalid
- removed
);
589 return invalid
- removed
;
592 /* note free_me must contain lsegs from a single layout_hdr */
594 pnfs_free_lseg_list(struct list_head
*free_me
)
596 struct pnfs_layout_segment
*lseg
, *tmp
;
598 if (list_empty(free_me
))
601 list_for_each_entry_safe(lseg
, tmp
, free_me
, pls_list
) {
602 list_del(&lseg
->pls_list
);
603 pnfs_free_lseg(lseg
);
608 pnfs_destroy_layout(struct nfs_inode
*nfsi
)
610 struct pnfs_layout_hdr
*lo
;
613 spin_lock(&nfsi
->vfs_inode
.i_lock
);
616 lo
->plh_block_lgets
++; /* permanently block new LAYOUTGETs */
617 pnfs_mark_matching_lsegs_invalid(lo
, &tmp_list
, NULL
);
618 pnfs_get_layout_hdr(lo
);
619 pnfs_layout_clear_fail_bit(lo
, NFS_LAYOUT_RO_FAILED
);
620 pnfs_layout_clear_fail_bit(lo
, NFS_LAYOUT_RW_FAILED
);
621 pnfs_clear_retry_layoutget(lo
);
622 spin_unlock(&nfsi
->vfs_inode
.i_lock
);
623 pnfs_free_lseg_list(&tmp_list
);
624 pnfs_put_layout_hdr(lo
);
626 spin_unlock(&nfsi
->vfs_inode
.i_lock
);
628 EXPORT_SYMBOL_GPL(pnfs_destroy_layout
);
631 pnfs_layout_add_bulk_destroy_list(struct inode
*inode
,
632 struct list_head
*layout_list
)
634 struct pnfs_layout_hdr
*lo
;
637 spin_lock(&inode
->i_lock
);
638 lo
= NFS_I(inode
)->layout
;
639 if (lo
!= NULL
&& list_empty(&lo
->plh_bulk_destroy
)) {
640 pnfs_get_layout_hdr(lo
);
641 list_add(&lo
->plh_bulk_destroy
, layout_list
);
644 spin_unlock(&inode
->i_lock
);
648 /* Caller must hold rcu_read_lock and clp->cl_lock */
650 pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client
*clp
,
651 struct nfs_server
*server
,
652 struct list_head
*layout_list
)
654 struct pnfs_layout_hdr
*lo
, *next
;
657 list_for_each_entry_safe(lo
, next
, &server
->layouts
, plh_layouts
) {
658 inode
= igrab(lo
->plh_inode
);
661 list_del_init(&lo
->plh_layouts
);
662 if (pnfs_layout_add_bulk_destroy_list(inode
, layout_list
))
665 spin_unlock(&clp
->cl_lock
);
667 spin_lock(&clp
->cl_lock
);
675 pnfs_layout_free_bulk_destroy_list(struct list_head
*layout_list
,
678 struct pnfs_layout_hdr
*lo
;
680 struct pnfs_layout_range range
= {
681 .iomode
= IOMODE_ANY
,
683 .length
= NFS4_MAX_UINT64
,
685 LIST_HEAD(lseg_list
);
688 while (!list_empty(layout_list
)) {
689 lo
= list_entry(layout_list
->next
, struct pnfs_layout_hdr
,
691 dprintk("%s freeing layout for inode %lu\n", __func__
,
692 lo
->plh_inode
->i_ino
);
693 inode
= lo
->plh_inode
;
695 pnfs_layoutcommit_inode(inode
, false);
697 spin_lock(&inode
->i_lock
);
698 list_del_init(&lo
->plh_bulk_destroy
);
699 lo
->plh_block_lgets
++; /* permanently block new LAYOUTGETs */
701 set_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
);
702 if (pnfs_mark_matching_lsegs_invalid(lo
, &lseg_list
, &range
))
704 spin_unlock(&inode
->i_lock
);
705 pnfs_free_lseg_list(&lseg_list
);
706 pnfs_put_layout_hdr(lo
);
713 pnfs_destroy_layouts_byfsid(struct nfs_client
*clp
,
714 struct nfs_fsid
*fsid
,
717 struct nfs_server
*server
;
718 LIST_HEAD(layout_list
);
720 spin_lock(&clp
->cl_lock
);
723 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
724 if (memcmp(&server
->fsid
, fsid
, sizeof(*fsid
)) != 0)
726 if (pnfs_layout_bulk_destroy_byserver_locked(clp
,
732 spin_unlock(&clp
->cl_lock
);
734 if (list_empty(&layout_list
))
736 return pnfs_layout_free_bulk_destroy_list(&layout_list
, is_recall
);
740 pnfs_destroy_layouts_byclid(struct nfs_client
*clp
,
743 struct nfs_server
*server
;
744 LIST_HEAD(layout_list
);
746 spin_lock(&clp
->cl_lock
);
749 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
750 if (pnfs_layout_bulk_destroy_byserver_locked(clp
,
756 spin_unlock(&clp
->cl_lock
);
758 if (list_empty(&layout_list
))
760 return pnfs_layout_free_bulk_destroy_list(&layout_list
, is_recall
);
764 * Called by the state manger to remove all layouts established under an
768 pnfs_destroy_all_layouts(struct nfs_client
*clp
)
770 nfs4_deviceid_mark_client_invalid(clp
);
771 nfs4_deviceid_purge_client(clp
);
773 pnfs_destroy_layouts_byclid(clp
, false);
777 * Compare 2 layout stateid sequence ids, to see which is newer,
778 * taking into account wraparound issues.
780 static bool pnfs_seqid_is_newer(u32 s1
, u32 s2
)
782 return (s32
)(s1
- s2
) > 0;
785 /* update lo->plh_stateid with new if is more recent */
787 pnfs_set_layout_stateid(struct pnfs_layout_hdr
*lo
, const nfs4_stateid
*new,
790 u32 oldseq
, newseq
, new_barrier
;
791 int empty
= list_empty(&lo
->plh_segs
);
793 oldseq
= be32_to_cpu(lo
->plh_stateid
.seqid
);
794 newseq
= be32_to_cpu(new->seqid
);
795 if (empty
|| pnfs_seqid_is_newer(newseq
, oldseq
)) {
796 nfs4_stateid_copy(&lo
->plh_stateid
, new);
797 if (update_barrier
) {
798 new_barrier
= be32_to_cpu(new->seqid
);
800 /* Because of wraparound, we want to keep the barrier
801 * "close" to the current seqids.
803 new_barrier
= newseq
- atomic_read(&lo
->plh_outstanding
);
805 if (empty
|| pnfs_seqid_is_newer(new_barrier
, lo
->plh_barrier
))
806 lo
->plh_barrier
= new_barrier
;
811 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr
*lo
,
812 const nfs4_stateid
*stateid
)
814 u32 seqid
= be32_to_cpu(stateid
->seqid
);
816 return !pnfs_seqid_is_newer(seqid
, lo
->plh_barrier
);
819 /* lget is set to 1 if called from inside send_layoutget call chain */
821 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr
*lo
)
823 return lo
->plh_block_lgets
||
824 test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
);
828 pnfs_choose_layoutget_stateid(nfs4_stateid
*dst
, struct pnfs_layout_hdr
*lo
,
829 struct pnfs_layout_range
*range
,
830 struct nfs4_state
*open_state
)
834 dprintk("--> %s\n", __func__
);
835 spin_lock(&lo
->plh_inode
->i_lock
);
836 if (pnfs_layoutgets_blocked(lo
)) {
838 } else if (!nfs4_valid_open_stateid(open_state
)) {
840 } else if (list_empty(&lo
->plh_segs
) ||
841 test_bit(NFS_LAYOUT_INVALID_STID
, &lo
->plh_flags
)) {
845 seq
= read_seqbegin(&open_state
->seqlock
);
846 nfs4_stateid_copy(dst
, &open_state
->stateid
);
847 } while (read_seqretry(&open_state
->seqlock
, seq
));
849 nfs4_stateid_copy(dst
, &lo
->plh_stateid
);
850 spin_unlock(&lo
->plh_inode
->i_lock
);
851 dprintk("<-- %s\n", __func__
);
856 * Get layout from server.
857 * for now, assume that whole file layouts are requested.
859 * arg->length: all ones
861 static struct pnfs_layout_segment
*
862 send_layoutget(struct pnfs_layout_hdr
*lo
,
863 struct nfs_open_context
*ctx
,
864 struct pnfs_layout_range
*range
,
867 struct inode
*ino
= lo
->plh_inode
;
868 struct nfs_server
*server
= NFS_SERVER(ino
);
869 struct nfs4_layoutget
*lgp
;
870 struct pnfs_layout_segment
*lseg
;
873 dprintk("--> %s\n", __func__
);
875 lgp
= kzalloc(sizeof(*lgp
), gfp_flags
);
879 i_size
= i_size_read(ino
);
881 lgp
->args
.minlength
= PAGE_CACHE_SIZE
;
882 if (lgp
->args
.minlength
> range
->length
)
883 lgp
->args
.minlength
= range
->length
;
884 if (range
->iomode
== IOMODE_READ
) {
885 if (range
->offset
>= i_size
)
886 lgp
->args
.minlength
= 0;
887 else if (i_size
- range
->offset
< lgp
->args
.minlength
)
888 lgp
->args
.minlength
= i_size
- range
->offset
;
890 lgp
->args
.maxcount
= PNFS_LAYOUT_MAXSIZE
;
891 lgp
->args
.range
= *range
;
892 lgp
->args
.type
= server
->pnfs_curr_ld
->id
;
893 lgp
->args
.inode
= ino
;
894 lgp
->args
.ctx
= get_nfs_open_context(ctx
);
895 lgp
->gfp_flags
= gfp_flags
;
896 lgp
->cred
= lo
->plh_lc_cred
;
898 /* Synchronously retrieve layout information from server and
901 lseg
= nfs4_proc_layoutget(lgp
, gfp_flags
);
903 switch (PTR_ERR(lseg
)) {
908 /* remember that LAYOUTGET failed and suspend trying */
909 pnfs_layout_io_set_failed(lo
, range
->iomode
);
913 pnfs_layout_clear_fail_bit(lo
,
914 pnfs_iomode_to_fail_bit(range
->iomode
));
919 static void pnfs_clear_layoutcommit(struct inode
*inode
,
920 struct list_head
*head
)
922 struct nfs_inode
*nfsi
= NFS_I(inode
);
923 struct pnfs_layout_segment
*lseg
, *tmp
;
925 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
))
927 list_for_each_entry_safe(lseg
, tmp
, &nfsi
->layout
->plh_segs
, pls_list
) {
928 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
))
930 pnfs_lseg_dec_and_remove_zero(lseg
, head
);
934 void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr
*lo
)
936 clear_bit_unlock(NFS_LAYOUT_RETURN
, &lo
->plh_flags
);
937 smp_mb__after_atomic();
938 wake_up_bit(&lo
->plh_flags
, NFS_LAYOUT_RETURN
);
939 rpc_wake_up(&NFS_SERVER(lo
->plh_inode
)->roc_rpcwaitq
);
943 pnfs_send_layoutreturn(struct pnfs_layout_hdr
*lo
, nfs4_stateid stateid
,
944 enum pnfs_iomode iomode
, bool sync
)
946 struct inode
*ino
= lo
->plh_inode
;
947 struct nfs4_layoutreturn
*lrp
;
950 lrp
= kzalloc(sizeof(*lrp
), GFP_NOFS
);
951 if (unlikely(lrp
== NULL
)) {
953 spin_lock(&ino
->i_lock
);
954 pnfs_clear_layoutreturn_waitbit(lo
);
955 spin_unlock(&ino
->i_lock
);
956 pnfs_put_layout_hdr(lo
);
960 lrp
->args
.stateid
= stateid
;
961 lrp
->args
.layout_type
= NFS_SERVER(ino
)->pnfs_curr_ld
->id
;
962 lrp
->args
.inode
= ino
;
963 lrp
->args
.range
.iomode
= iomode
;
964 lrp
->args
.range
.offset
= 0;
965 lrp
->args
.range
.length
= NFS4_MAX_UINT64
;
966 lrp
->args
.layout
= lo
;
967 lrp
->clp
= NFS_SERVER(ino
)->nfs_client
;
968 lrp
->cred
= lo
->plh_lc_cred
;
970 status
= nfs4_proc_layoutreturn(lrp
, sync
);
972 dprintk("<-- %s status: %d\n", __func__
, status
);
977 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
978 * when the layout segment list is empty.
980 * Note that a pnfs_layout_hdr can exist with an empty layout segment
981 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
982 * deviceid is marked invalid.
985 _pnfs_return_layout(struct inode
*ino
)
987 struct pnfs_layout_hdr
*lo
= NULL
;
988 struct nfs_inode
*nfsi
= NFS_I(ino
);
990 nfs4_stateid stateid
;
991 int status
= 0, empty
;
994 dprintk("NFS: %s for inode %lu\n", __func__
, ino
->i_ino
);
996 spin_lock(&ino
->i_lock
);
999 spin_unlock(&ino
->i_lock
);
1000 dprintk("NFS: %s no layout to return\n", __func__
);
1003 stateid
= nfsi
->layout
->plh_stateid
;
1004 /* Reference matched in nfs4_layoutreturn_release */
1005 pnfs_get_layout_hdr(lo
);
1006 empty
= list_empty(&lo
->plh_segs
);
1007 pnfs_clear_layoutcommit(ino
, &tmp_list
);
1008 pnfs_mark_matching_lsegs_invalid(lo
, &tmp_list
, NULL
);
1010 if (NFS_SERVER(ino
)->pnfs_curr_ld
->return_range
) {
1011 struct pnfs_layout_range range
= {
1012 .iomode
= IOMODE_ANY
,
1014 .length
= NFS4_MAX_UINT64
,
1016 NFS_SERVER(ino
)->pnfs_curr_ld
->return_range(lo
, &range
);
1019 /* Don't send a LAYOUTRETURN if list was initially empty */
1021 spin_unlock(&ino
->i_lock
);
1022 dprintk("NFS: %s no layout segments to return\n", __func__
);
1023 goto out_put_layout_hdr
;
1026 set_bit(NFS_LAYOUT_INVALID_STID
, &lo
->plh_flags
);
1027 send
= pnfs_prepare_layoutreturn(lo
);
1028 spin_unlock(&ino
->i_lock
);
1029 pnfs_free_lseg_list(&tmp_list
);
1031 status
= pnfs_send_layoutreturn(lo
, stateid
, IOMODE_ANY
, true);
1033 pnfs_put_layout_hdr(lo
);
1035 dprintk("<-- %s status: %d\n", __func__
, status
);
1038 EXPORT_SYMBOL_GPL(_pnfs_return_layout
);
1041 pnfs_commit_and_return_layout(struct inode
*inode
)
1043 struct pnfs_layout_hdr
*lo
;
1046 spin_lock(&inode
->i_lock
);
1047 lo
= NFS_I(inode
)->layout
;
1049 spin_unlock(&inode
->i_lock
);
1052 pnfs_get_layout_hdr(lo
);
1053 /* Block new layoutgets and read/write to ds */
1054 lo
->plh_block_lgets
++;
1055 spin_unlock(&inode
->i_lock
);
1056 filemap_fdatawait(inode
->i_mapping
);
1057 ret
= pnfs_layoutcommit_inode(inode
, true);
1059 ret
= _pnfs_return_layout(inode
);
1060 spin_lock(&inode
->i_lock
);
1061 lo
->plh_block_lgets
--;
1062 spin_unlock(&inode
->i_lock
);
1063 pnfs_put_layout_hdr(lo
);
1067 bool pnfs_roc(struct inode
*ino
)
1069 struct nfs_inode
*nfsi
= NFS_I(ino
);
1070 struct nfs_open_context
*ctx
;
1071 struct nfs4_state
*state
;
1072 struct pnfs_layout_hdr
*lo
;
1073 struct pnfs_layout_segment
*lseg
, *tmp
;
1074 nfs4_stateid stateid
;
1075 LIST_HEAD(tmp_list
);
1076 bool found
= false, layoutreturn
= false, roc
= false;
1078 spin_lock(&ino
->i_lock
);
1080 if (!lo
|| test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
))
1083 /* no roc if we hold a delegation */
1084 if (nfs4_check_delegation(ino
, FMODE_READ
))
1087 list_for_each_entry(ctx
, &nfsi
->open_files
, list
) {
1089 /* Don't return layout if there is open file state */
1090 if (state
!= NULL
&& state
->state
!= 0)
1094 stateid
= lo
->plh_stateid
;
1095 /* always send layoutreturn if being marked so */
1096 if (test_and_clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE
,
1098 layoutreturn
= pnfs_prepare_layoutreturn(lo
);
1100 pnfs_clear_retry_layoutget(lo
);
1101 list_for_each_entry_safe(lseg
, tmp
, &lo
->plh_segs
, pls_list
)
1102 /* If we are sending layoutreturn, invalidate all valid lsegs */
1103 if (layoutreturn
|| test_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
)) {
1104 mark_lseg_invalid(lseg
, &tmp_list
);
1107 /* pnfs_prepare_layoutreturn() grabs lo ref and it will be put
1108 * in pnfs_roc_release(). We don't really send a layoutreturn but
1109 * still want others to view us like we are sending one!
1111 * If pnfs_prepare_layoutreturn() fails, it means someone else is doing
1112 * LAYOUTRETURN, so we proceed like there are no layouts to return.
1114 * ROC in three conditions:
1115 * 1. there are ROC lsegs
1116 * 2. we don't send layoutreturn
1117 * 3. no others are sending layoutreturn
1119 if (found
&& !layoutreturn
&& pnfs_prepare_layoutreturn(lo
))
1123 spin_unlock(&ino
->i_lock
);
1124 pnfs_free_lseg_list(&tmp_list
);
1125 pnfs_layoutcommit_inode(ino
, true);
1127 pnfs_send_layoutreturn(lo
, stateid
, IOMODE_ANY
, true);
1131 void pnfs_roc_release(struct inode
*ino
)
1133 struct pnfs_layout_hdr
*lo
;
1135 spin_lock(&ino
->i_lock
);
1136 lo
= NFS_I(ino
)->layout
;
1137 pnfs_clear_layoutreturn_waitbit(lo
);
1138 if (atomic_dec_and_test(&lo
->plh_refcount
)) {
1139 pnfs_detach_layout_hdr(lo
);
1140 spin_unlock(&ino
->i_lock
);
1141 pnfs_free_layout_hdr(lo
);
1143 spin_unlock(&ino
->i_lock
);
1146 void pnfs_roc_set_barrier(struct inode
*ino
, u32 barrier
)
1148 struct pnfs_layout_hdr
*lo
;
1150 spin_lock(&ino
->i_lock
);
1151 lo
= NFS_I(ino
)->layout
;
1152 if (pnfs_seqid_is_newer(barrier
, lo
->plh_barrier
))
1153 lo
->plh_barrier
= barrier
;
1154 spin_unlock(&ino
->i_lock
);
1155 trace_nfs4_layoutreturn_on_close(ino
, 0);
1158 void pnfs_roc_get_barrier(struct inode
*ino
, u32
*barrier
)
1160 struct nfs_inode
*nfsi
= NFS_I(ino
);
1161 struct pnfs_layout_hdr
*lo
;
1164 spin_lock(&ino
->i_lock
);
1166 current_seqid
= be32_to_cpu(lo
->plh_stateid
.seqid
);
1168 /* Since close does not return a layout stateid for use as
1169 * a barrier, we choose the worst-case barrier.
1171 *barrier
= current_seqid
+ atomic_read(&lo
->plh_outstanding
);
1172 spin_unlock(&ino
->i_lock
);
1176 * Compare two layout segments for sorting into layout cache.
1177 * We want to preferentially return RW over RO layouts, so ensure those
1181 pnfs_lseg_range_cmp(const struct pnfs_layout_range
*l1
,
1182 const struct pnfs_layout_range
*l2
)
1186 /* high offset > low offset */
1187 d
= l1
->offset
- l2
->offset
;
1191 /* short length > long length */
1192 d
= l2
->length
- l1
->length
;
1196 /* read > read/write */
1197 return (int)(l1
->iomode
== IOMODE_READ
) - (int)(l2
->iomode
== IOMODE_READ
);
1201 pnfs_lseg_range_is_after(const struct pnfs_layout_range
*l1
,
1202 const struct pnfs_layout_range
*l2
)
1204 return pnfs_lseg_range_cmp(l1
, l2
) > 0;
1208 pnfs_lseg_no_merge(struct pnfs_layout_segment
*lseg
,
1209 struct pnfs_layout_segment
*old
)
1215 pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr
*lo
,
1216 struct pnfs_layout_segment
*lseg
,
1217 bool (*is_after
)(const struct pnfs_layout_range
*,
1218 const struct pnfs_layout_range
*),
1219 bool (*do_merge
)(struct pnfs_layout_segment
*,
1220 struct pnfs_layout_segment
*),
1221 struct list_head
*free_me
)
1223 struct pnfs_layout_segment
*lp
, *tmp
;
1225 dprintk("%s:Begin\n", __func__
);
1227 list_for_each_entry_safe(lp
, tmp
, &lo
->plh_segs
, pls_list
) {
1228 if (test_bit(NFS_LSEG_VALID
, &lp
->pls_flags
) == 0)
1230 if (do_merge(lseg
, lp
)) {
1231 mark_lseg_invalid(lp
, free_me
);
1234 if (is_after(&lseg
->pls_range
, &lp
->pls_range
))
1236 list_add_tail(&lseg
->pls_list
, &lp
->pls_list
);
1237 dprintk("%s: inserted lseg %p "
1238 "iomode %d offset %llu length %llu before "
1239 "lp %p iomode %d offset %llu length %llu\n",
1240 __func__
, lseg
, lseg
->pls_range
.iomode
,
1241 lseg
->pls_range
.offset
, lseg
->pls_range
.length
,
1242 lp
, lp
->pls_range
.iomode
, lp
->pls_range
.offset
,
1243 lp
->pls_range
.length
);
1246 list_add_tail(&lseg
->pls_list
, &lo
->plh_segs
);
1247 dprintk("%s: inserted lseg %p "
1248 "iomode %d offset %llu length %llu at tail\n",
1249 __func__
, lseg
, lseg
->pls_range
.iomode
,
1250 lseg
->pls_range
.offset
, lseg
->pls_range
.length
);
1252 pnfs_get_layout_hdr(lo
);
1254 dprintk("%s:Return\n", __func__
);
1256 EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg
);
1259 pnfs_layout_insert_lseg(struct pnfs_layout_hdr
*lo
,
1260 struct pnfs_layout_segment
*lseg
,
1261 struct list_head
*free_me
)
1263 struct inode
*inode
= lo
->plh_inode
;
1264 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(inode
)->pnfs_curr_ld
;
1266 if (ld
->add_lseg
!= NULL
)
1267 ld
->add_lseg(lo
, lseg
, free_me
);
1269 pnfs_generic_layout_insert_lseg(lo
, lseg
,
1270 pnfs_lseg_range_is_after
,
1275 static struct pnfs_layout_hdr
*
1276 alloc_init_layout_hdr(struct inode
*ino
,
1277 struct nfs_open_context
*ctx
,
1280 struct pnfs_layout_hdr
*lo
;
1282 lo
= pnfs_alloc_layout_hdr(ino
, gfp_flags
);
1285 atomic_set(&lo
->plh_refcount
, 1);
1286 INIT_LIST_HEAD(&lo
->plh_layouts
);
1287 INIT_LIST_HEAD(&lo
->plh_segs
);
1288 INIT_LIST_HEAD(&lo
->plh_bulk_destroy
);
1289 lo
->plh_inode
= ino
;
1290 lo
->plh_lc_cred
= get_rpccred(ctx
->cred
);
1294 static struct pnfs_layout_hdr
*
1295 pnfs_find_alloc_layout(struct inode
*ino
,
1296 struct nfs_open_context
*ctx
,
1299 struct nfs_inode
*nfsi
= NFS_I(ino
);
1300 struct pnfs_layout_hdr
*new = NULL
;
1302 dprintk("%s Begin ino=%p layout=%p\n", __func__
, ino
, nfsi
->layout
);
1304 if (nfsi
->layout
!= NULL
)
1306 spin_unlock(&ino
->i_lock
);
1307 new = alloc_init_layout_hdr(ino
, ctx
, gfp_flags
);
1308 spin_lock(&ino
->i_lock
);
1310 if (likely(nfsi
->layout
== NULL
)) { /* Won the race? */
1313 } else if (new != NULL
)
1314 pnfs_free_layout_hdr(new);
1316 pnfs_get_layout_hdr(nfsi
->layout
);
1317 return nfsi
->layout
;
1321 * iomode matching rules:
1332 pnfs_lseg_range_match(const struct pnfs_layout_range
*ls_range
,
1333 const struct pnfs_layout_range
*range
)
1335 struct pnfs_layout_range range1
;
1337 if ((range
->iomode
== IOMODE_RW
&&
1338 ls_range
->iomode
!= IOMODE_RW
) ||
1339 !pnfs_lseg_range_intersecting(ls_range
, range
))
1342 /* range1 covers only the first byte in the range */
1345 return pnfs_lseg_range_contained(ls_range
, &range1
);
1349 * lookup range in layout
1351 static struct pnfs_layout_segment
*
1352 pnfs_find_lseg(struct pnfs_layout_hdr
*lo
,
1353 struct pnfs_layout_range
*range
)
1355 struct pnfs_layout_segment
*lseg
, *ret
= NULL
;
1357 dprintk("%s:Begin\n", __func__
);
1359 list_for_each_entry(lseg
, &lo
->plh_segs
, pls_list
) {
1360 if (test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
) &&
1361 !test_bit(NFS_LSEG_LAYOUTRETURN
, &lseg
->pls_flags
) &&
1362 pnfs_lseg_range_match(&lseg
->pls_range
, range
)) {
1363 ret
= pnfs_get_lseg(lseg
);
1368 dprintk("%s:Return lseg %p ref %d\n",
1369 __func__
, ret
, ret
? atomic_read(&ret
->pls_refcount
) : 0);
1374 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1375 * to the MDS or over pNFS
1377 * The nfs_inode read_io and write_io fields are cumulative counters reset
1378 * when there are no layout segments. Note that in pnfs_update_layout iomode
1379 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1382 * A return of true means use MDS I/O.
1385 * If a file's size is smaller than the file size threshold, data accesses
1386 * SHOULD be sent to the metadata server. If an I/O request has a length that
1387 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1388 * server. If both file size and I/O size are provided, the client SHOULD
1389 * reach or exceed both thresholds before sending its read or write
1390 * requests to the data server.
1392 static bool pnfs_within_mdsthreshold(struct nfs_open_context
*ctx
,
1393 struct inode
*ino
, int iomode
)
1395 struct nfs4_threshold
*t
= ctx
->mdsthreshold
;
1396 struct nfs_inode
*nfsi
= NFS_I(ino
);
1397 loff_t fsize
= i_size_read(ino
);
1398 bool size
= false, size_set
= false, io
= false, io_set
= false, ret
= false;
1403 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1404 __func__
, t
->bm
, t
->rd_sz
, t
->wr_sz
, t
->rd_io_sz
, t
->wr_io_sz
);
1408 if (t
->bm
& THRESHOLD_RD
) {
1409 dprintk("%s fsize %llu\n", __func__
, fsize
);
1411 if (fsize
< t
->rd_sz
)
1414 if (t
->bm
& THRESHOLD_RD_IO
) {
1415 dprintk("%s nfsi->read_io %llu\n", __func__
,
1418 if (nfsi
->read_io
< t
->rd_io_sz
)
1423 if (t
->bm
& THRESHOLD_WR
) {
1424 dprintk("%s fsize %llu\n", __func__
, fsize
);
1426 if (fsize
< t
->wr_sz
)
1429 if (t
->bm
& THRESHOLD_WR_IO
) {
1430 dprintk("%s nfsi->write_io %llu\n", __func__
,
1433 if (nfsi
->write_io
< t
->wr_io_sz
)
1438 if (size_set
&& io_set
) {
1441 } else if (size
|| io
)
1444 dprintk("<-- %s size %d io %d ret %d\n", __func__
, size
, io
, ret
);
1448 /* stop waiting if someone clears NFS_LAYOUT_RETRY_LAYOUTGET bit. */
1449 static int pnfs_layoutget_retry_bit_wait(struct wait_bit_key
*key
)
1451 if (!test_bit(NFS_LAYOUT_RETRY_LAYOUTGET
, key
->flags
))
1453 return nfs_wait_bit_killable(key
);
1456 static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr
*lo
)
1458 if (!pnfs_should_retry_layoutget(lo
))
1461 * send layoutcommit as it can hold up layoutreturn due to lseg
1464 pnfs_layoutcommit_inode(lo
->plh_inode
, false);
1465 return !wait_on_bit_action(&lo
->plh_flags
, NFS_LAYOUT_RETURN
,
1466 pnfs_layoutget_retry_bit_wait
,
1467 TASK_UNINTERRUPTIBLE
);
1470 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr
*lo
)
1472 unsigned long *bitlock
= &lo
->plh_flags
;
1474 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET
, bitlock
);
1475 smp_mb__after_atomic();
1476 wake_up_bit(bitlock
, NFS_LAYOUT_FIRST_LAYOUTGET
);
1480 * Layout segment is retreived from the server if not cached.
1481 * The appropriate layout segment is referenced and returned to the caller.
1483 struct pnfs_layout_segment
*
1484 pnfs_update_layout(struct inode
*ino
,
1485 struct nfs_open_context
*ctx
,
1488 enum pnfs_iomode iomode
,
1491 struct pnfs_layout_range arg
= {
1497 struct nfs_server
*server
= NFS_SERVER(ino
);
1498 struct nfs_client
*clp
= server
->nfs_client
;
1499 struct pnfs_layout_hdr
*lo
;
1500 struct pnfs_layout_segment
*lseg
= NULL
;
1503 if (!pnfs_enabled_sb(NFS_SERVER(ino
)))
1506 if (iomode
== IOMODE_READ
&& i_size_read(ino
) == 0)
1509 if (pnfs_within_mdsthreshold(ctx
, ino
, iomode
))
1514 spin_lock(&ino
->i_lock
);
1515 lo
= pnfs_find_alloc_layout(ino
, ctx
, gfp_flags
);
1517 spin_unlock(&ino
->i_lock
);
1521 /* Do we even need to bother with this? */
1522 if (test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
)) {
1523 dprintk("%s matches recall, use MDS\n", __func__
);
1527 /* if LAYOUTGET already failed once we don't try again */
1528 if (pnfs_layout_io_test_failed(lo
, iomode
) &&
1529 !pnfs_should_retry_layoutget(lo
))
1532 first
= list_empty(&lo
->plh_segs
);
1534 /* The first layoutget for the file. Need to serialize per
1535 * RFC 5661 Errata 3208.
1537 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET
,
1539 spin_unlock(&ino
->i_lock
);
1540 wait_on_bit(&lo
->plh_flags
, NFS_LAYOUT_FIRST_LAYOUTGET
,
1541 TASK_UNINTERRUPTIBLE
);
1542 pnfs_put_layout_hdr(lo
);
1546 /* Check to see if the layout for the given range
1549 lseg
= pnfs_find_lseg(lo
, &arg
);
1555 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
1556 * for LAYOUTRETURN even if first is true.
1558 if (test_bit(NFS_LAYOUT_RETURN
, &lo
->plh_flags
)) {
1559 spin_unlock(&ino
->i_lock
);
1560 dprintk("%s wait for layoutreturn\n", __func__
);
1561 if (pnfs_prepare_to_retry_layoutget(lo
)) {
1563 pnfs_clear_first_layoutget(lo
);
1564 pnfs_put_layout_hdr(lo
);
1565 dprintk("%s retrying\n", __func__
);
1568 goto out_put_layout_hdr
;
1571 if (pnfs_layoutgets_blocked(lo
))
1573 atomic_inc(&lo
->plh_outstanding
);
1574 spin_unlock(&ino
->i_lock
);
1576 if (list_empty(&lo
->plh_layouts
)) {
1577 /* The lo must be on the clp list if there is any
1578 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1580 spin_lock(&clp
->cl_lock
);
1581 if (list_empty(&lo
->plh_layouts
))
1582 list_add_tail(&lo
->plh_layouts
, &server
->layouts
);
1583 spin_unlock(&clp
->cl_lock
);
1586 pg_offset
= arg
.offset
& ~PAGE_CACHE_MASK
;
1588 arg
.offset
-= pg_offset
;
1589 arg
.length
+= pg_offset
;
1591 if (arg
.length
!= NFS4_MAX_UINT64
)
1592 arg
.length
= PAGE_CACHE_ALIGN(arg
.length
);
1594 lseg
= send_layoutget(lo
, ctx
, &arg
, gfp_flags
);
1595 pnfs_clear_retry_layoutget(lo
);
1596 atomic_dec(&lo
->plh_outstanding
);
1599 pnfs_clear_first_layoutget(lo
);
1600 pnfs_put_layout_hdr(lo
);
1602 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1603 "(%s, offset: %llu, length: %llu)\n",
1604 __func__
, ino
->i_sb
->s_id
,
1605 (unsigned long long)NFS_FILEID(ino
),
1606 lseg
== NULL
? "not found" : "found",
1607 iomode
==IOMODE_RW
? "read/write" : "read-only",
1608 (unsigned long long)pos
,
1609 (unsigned long long)count
);
1612 spin_unlock(&ino
->i_lock
);
1613 goto out_put_layout_hdr
;
1615 EXPORT_SYMBOL_GPL(pnfs_update_layout
);
1618 pnfs_sanity_check_layout_range(struct pnfs_layout_range
*range
)
1620 switch (range
->iomode
) {
1627 if (range
->offset
== NFS4_MAX_UINT64
)
1629 if (range
->length
== 0)
1631 if (range
->length
!= NFS4_MAX_UINT64
&&
1632 range
->length
> NFS4_MAX_UINT64
- range
->offset
)
1637 struct pnfs_layout_segment
*
1638 pnfs_layout_process(struct nfs4_layoutget
*lgp
)
1640 struct pnfs_layout_hdr
*lo
= NFS_I(lgp
->args
.inode
)->layout
;
1641 struct nfs4_layoutget_res
*res
= &lgp
->res
;
1642 struct pnfs_layout_segment
*lseg
;
1643 struct inode
*ino
= lo
->plh_inode
;
1645 int status
= -EINVAL
;
1647 if (!pnfs_sanity_check_layout_range(&res
->range
))
1650 /* Inject layout blob into I/O device driver */
1651 lseg
= NFS_SERVER(ino
)->pnfs_curr_ld
->alloc_lseg(lo
, res
, lgp
->gfp_flags
);
1652 if (!lseg
|| IS_ERR(lseg
)) {
1656 status
= PTR_ERR(lseg
);
1657 dprintk("%s: Could not allocate layout: error %d\n",
1662 init_lseg(lo
, lseg
);
1663 lseg
->pls_range
= res
->range
;
1665 spin_lock(&ino
->i_lock
);
1666 if (pnfs_layoutgets_blocked(lo
)) {
1667 dprintk("%s forget reply due to state\n", __func__
);
1668 goto out_forget_reply
;
1671 if (nfs4_stateid_match_other(&lo
->plh_stateid
, &res
->stateid
)) {
1672 /* existing state ID, make sure the sequence number matches. */
1673 if (pnfs_layout_stateid_blocked(lo
, &res
->stateid
)) {
1674 dprintk("%s forget reply due to sequence\n", __func__
);
1675 goto out_forget_reply
;
1677 pnfs_set_layout_stateid(lo
, &res
->stateid
, false);
1680 * We got an entirely new state ID. Mark all segments for the
1681 * inode invalid, and don't bother validating the stateid
1684 pnfs_mark_matching_lsegs_invalid(lo
, &free_me
, NULL
);
1686 nfs4_stateid_copy(&lo
->plh_stateid
, &res
->stateid
);
1687 lo
->plh_barrier
= be32_to_cpu(res
->stateid
.seqid
);
1690 clear_bit(NFS_LAYOUT_INVALID_STID
, &lo
->plh_flags
);
1692 pnfs_get_lseg(lseg
);
1693 pnfs_layout_insert_lseg(lo
, lseg
, &free_me
);
1695 if (res
->return_on_close
)
1696 set_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
);
1698 spin_unlock(&ino
->i_lock
);
1699 pnfs_free_lseg_list(&free_me
);
1702 return ERR_PTR(status
);
1705 spin_unlock(&ino
->i_lock
);
1706 lseg
->pls_layout
= lo
;
1707 NFS_SERVER(ino
)->pnfs_curr_ld
->free_lseg(lseg
);
1712 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr
*lo
,
1713 struct list_head
*tmp_list
,
1714 struct pnfs_layout_range
*return_range
)
1716 struct pnfs_layout_segment
*lseg
, *next
;
1718 dprintk("%s:Begin lo %p\n", __func__
, lo
);
1720 if (list_empty(&lo
->plh_segs
))
1723 list_for_each_entry_safe(lseg
, next
, &lo
->plh_segs
, pls_list
)
1724 if (should_free_lseg(&lseg
->pls_range
, return_range
)) {
1725 dprintk("%s: marking lseg %p iomode %d "
1726 "offset %llu length %llu\n", __func__
,
1727 lseg
, lseg
->pls_range
.iomode
,
1728 lseg
->pls_range
.offset
,
1729 lseg
->pls_range
.length
);
1730 set_bit(NFS_LSEG_LAYOUTRETURN
, &lseg
->pls_flags
);
1731 mark_lseg_invalid(lseg
, tmp_list
);
1732 set_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE
,
1737 void pnfs_error_mark_layout_for_return(struct inode
*inode
,
1738 struct pnfs_layout_segment
*lseg
)
1740 struct pnfs_layout_hdr
*lo
= NFS_I(inode
)->layout
;
1741 int iomode
= pnfs_iomode_to_fail_bit(lseg
->pls_range
.iomode
);
1742 struct pnfs_layout_range range
= {
1743 .iomode
= lseg
->pls_range
.iomode
,
1745 .length
= NFS4_MAX_UINT64
,
1749 spin_lock(&inode
->i_lock
);
1750 /* set failure bit so that pnfs path will be retried later */
1751 pnfs_layout_set_fail_bit(lo
, iomode
);
1752 if (lo
->plh_return_iomode
== 0)
1753 lo
->plh_return_iomode
= range
.iomode
;
1754 else if (lo
->plh_return_iomode
!= range
.iomode
)
1755 lo
->plh_return_iomode
= IOMODE_ANY
;
1757 * mark all matching lsegs so that we are sure to have no live
1758 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
1761 pnfs_mark_matching_lsegs_return(lo
, &free_me
, &range
);
1762 spin_unlock(&inode
->i_lock
);
1763 pnfs_free_lseg_list(&free_me
);
1765 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return
);
1768 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*req
)
1770 u64 rd_size
= req
->wb_bytes
;
1772 if (pgio
->pg_lseg
== NULL
) {
1773 if (pgio
->pg_dreq
== NULL
)
1774 rd_size
= i_size_read(pgio
->pg_inode
) - req_offset(req
);
1776 rd_size
= nfs_dreq_bytes_left(pgio
->pg_dreq
);
1778 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
1785 /* If no lseg, fall back to read through mds */
1786 if (pgio
->pg_lseg
== NULL
)
1787 nfs_pageio_reset_read_mds(pgio
);
1790 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read
);
1793 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor
*pgio
,
1794 struct nfs_page
*req
, u64 wb_size
)
1796 if (pgio
->pg_lseg
== NULL
)
1797 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
1803 /* If no lseg, fall back to write through mds */
1804 if (pgio
->pg_lseg
== NULL
)
1805 nfs_pageio_reset_write_mds(pgio
);
1807 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write
);
1810 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor
*desc
)
1812 if (desc
->pg_lseg
) {
1813 pnfs_put_lseg(desc
->pg_lseg
);
1814 desc
->pg_lseg
= NULL
;
1817 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup
);
1820 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
1821 * of bytes (maximum @req->wb_bytes) that can be coalesced.
1824 pnfs_generic_pg_test(struct nfs_pageio_descriptor
*pgio
,
1825 struct nfs_page
*prev
, struct nfs_page
*req
)
1828 u64 seg_end
, req_start
, seg_left
;
1830 size
= nfs_generic_pg_test(pgio
, prev
, req
);
1835 * 'size' contains the number of bytes left in the current page (up
1836 * to the original size asked for in @req->wb_bytes).
1838 * Calculate how many bytes are left in the layout segment
1839 * and if there are less bytes than 'size', return that instead.
1841 * Please also note that 'end_offset' is actually the offset of the
1842 * first byte that lies outside the pnfs_layout_range. FIXME?
1845 if (pgio
->pg_lseg
) {
1846 seg_end
= end_offset(pgio
->pg_lseg
->pls_range
.offset
,
1847 pgio
->pg_lseg
->pls_range
.length
);
1848 req_start
= req_offset(req
);
1849 WARN_ON_ONCE(req_start
>= seg_end
);
1850 /* start of request is past the last byte of this segment */
1851 if (req_start
>= seg_end
) {
1852 /* reference the new lseg */
1853 if (pgio
->pg_ops
->pg_cleanup
)
1854 pgio
->pg_ops
->pg_cleanup(pgio
);
1855 if (pgio
->pg_ops
->pg_init
)
1856 pgio
->pg_ops
->pg_init(pgio
, req
);
1860 /* adjust 'size' iff there are fewer bytes left in the
1861 * segment than what nfs_generic_pg_test returned */
1862 seg_left
= seg_end
- req_start
;
1863 if (seg_left
< size
)
1864 size
= (unsigned int)seg_left
;
1869 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test
);
1871 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header
*hdr
)
1873 struct nfs_pageio_descriptor pgio
;
1875 /* Resend all requests through the MDS */
1876 nfs_pageio_init_write(&pgio
, hdr
->inode
, FLUSH_STABLE
, true,
1877 hdr
->completion_ops
);
1878 set_bit(NFS_CONTEXT_RESEND_WRITES
, &hdr
->args
.context
->flags
);
1879 return nfs_pageio_resend(&pgio
, hdr
);
1881 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds
);
1883 static void pnfs_ld_handle_write_error(struct nfs_pgio_header
*hdr
)
1886 dprintk("pnfs write error = %d\n", hdr
->pnfs_error
);
1887 if (NFS_SERVER(hdr
->inode
)->pnfs_curr_ld
->flags
&
1888 PNFS_LAYOUTRET_ON_ERROR
) {
1889 pnfs_return_layout(hdr
->inode
);
1891 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
))
1892 hdr
->task
.tk_status
= pnfs_write_done_resend_to_mds(hdr
);
1896 * Called by non rpc-based layout drivers
1898 void pnfs_ld_write_done(struct nfs_pgio_header
*hdr
)
1900 trace_nfs4_pnfs_write(hdr
, hdr
->pnfs_error
);
1901 if (!hdr
->pnfs_error
) {
1902 pnfs_set_layoutcommit(hdr
->inode
, hdr
->lseg
,
1903 hdr
->mds_offset
+ hdr
->res
.count
);
1904 hdr
->mds_ops
->rpc_call_done(&hdr
->task
, hdr
);
1906 pnfs_ld_handle_write_error(hdr
);
1907 hdr
->mds_ops
->rpc_release(hdr
);
1909 EXPORT_SYMBOL_GPL(pnfs_ld_write_done
);
1912 pnfs_write_through_mds(struct nfs_pageio_descriptor
*desc
,
1913 struct nfs_pgio_header
*hdr
)
1915 struct nfs_pgio_mirror
*mirror
= nfs_pgio_current_mirror(desc
);
1917 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
1918 list_splice_tail_init(&hdr
->pages
, &mirror
->pg_list
);
1919 nfs_pageio_reset_write_mds(desc
);
1920 mirror
->pg_recoalesce
= 1;
1922 nfs_pgio_data_destroy(hdr
);
1926 static enum pnfs_try_status
1927 pnfs_try_to_write_data(struct nfs_pgio_header
*hdr
,
1928 const struct rpc_call_ops
*call_ops
,
1929 struct pnfs_layout_segment
*lseg
,
1932 struct inode
*inode
= hdr
->inode
;
1933 enum pnfs_try_status trypnfs
;
1934 struct nfs_server
*nfss
= NFS_SERVER(inode
);
1936 hdr
->mds_ops
= call_ops
;
1938 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__
,
1939 inode
->i_ino
, hdr
->args
.count
, hdr
->args
.offset
, how
);
1940 trypnfs
= nfss
->pnfs_curr_ld
->write_pagelist(hdr
, how
);
1941 if (trypnfs
!= PNFS_NOT_ATTEMPTED
)
1942 nfs_inc_stats(inode
, NFSIOS_PNFS_WRITE
);
1943 dprintk("%s End (trypnfs:%d)\n", __func__
, trypnfs
);
1948 pnfs_do_write(struct nfs_pageio_descriptor
*desc
,
1949 struct nfs_pgio_header
*hdr
, int how
)
1951 const struct rpc_call_ops
*call_ops
= desc
->pg_rpc_callops
;
1952 struct pnfs_layout_segment
*lseg
= desc
->pg_lseg
;
1953 enum pnfs_try_status trypnfs
;
1955 trypnfs
= pnfs_try_to_write_data(hdr
, call_ops
, lseg
, how
);
1956 if (trypnfs
== PNFS_NOT_ATTEMPTED
)
1957 pnfs_write_through_mds(desc
, hdr
);
1960 static void pnfs_writehdr_free(struct nfs_pgio_header
*hdr
)
1962 pnfs_put_lseg(hdr
->lseg
);
1963 nfs_pgio_header_free(hdr
);
1967 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor
*desc
)
1969 struct nfs_pgio_mirror
*mirror
= nfs_pgio_current_mirror(desc
);
1971 struct nfs_pgio_header
*hdr
;
1974 hdr
= nfs_pgio_header_alloc(desc
->pg_rw_ops
);
1976 desc
->pg_completion_ops
->error_cleanup(&mirror
->pg_list
);
1979 nfs_pgheader_init(desc
, hdr
, pnfs_writehdr_free
);
1981 hdr
->lseg
= pnfs_get_lseg(desc
->pg_lseg
);
1982 ret
= nfs_generic_pgio(desc
, hdr
);
1984 pnfs_do_write(desc
, hdr
, desc
->pg_ioflags
);
1988 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages
);
1990 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header
*hdr
)
1992 struct nfs_pageio_descriptor pgio
;
1994 /* Resend all requests through the MDS */
1995 nfs_pageio_init_read(&pgio
, hdr
->inode
, true, hdr
->completion_ops
);
1996 return nfs_pageio_resend(&pgio
, hdr
);
1998 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds
);
2000 static void pnfs_ld_handle_read_error(struct nfs_pgio_header
*hdr
)
2002 dprintk("pnfs read error = %d\n", hdr
->pnfs_error
);
2003 if (NFS_SERVER(hdr
->inode
)->pnfs_curr_ld
->flags
&
2004 PNFS_LAYOUTRET_ON_ERROR
) {
2005 pnfs_return_layout(hdr
->inode
);
2007 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
))
2008 hdr
->task
.tk_status
= pnfs_read_done_resend_to_mds(hdr
);
2012 * Called by non rpc-based layout drivers
2014 void pnfs_ld_read_done(struct nfs_pgio_header
*hdr
)
2016 trace_nfs4_pnfs_read(hdr
, hdr
->pnfs_error
);
2017 if (likely(!hdr
->pnfs_error
)) {
2018 __nfs4_read_done_cb(hdr
);
2019 hdr
->mds_ops
->rpc_call_done(&hdr
->task
, hdr
);
2021 pnfs_ld_handle_read_error(hdr
);
2022 hdr
->mds_ops
->rpc_release(hdr
);
2024 EXPORT_SYMBOL_GPL(pnfs_ld_read_done
);
2027 pnfs_read_through_mds(struct nfs_pageio_descriptor
*desc
,
2028 struct nfs_pgio_header
*hdr
)
2030 struct nfs_pgio_mirror
*mirror
= nfs_pgio_current_mirror(desc
);
2032 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
2033 list_splice_tail_init(&hdr
->pages
, &mirror
->pg_list
);
2034 nfs_pageio_reset_read_mds(desc
);
2035 mirror
->pg_recoalesce
= 1;
2037 nfs_pgio_data_destroy(hdr
);
2042 * Call the appropriate parallel I/O subsystem read function.
2044 static enum pnfs_try_status
2045 pnfs_try_to_read_data(struct nfs_pgio_header
*hdr
,
2046 const struct rpc_call_ops
*call_ops
,
2047 struct pnfs_layout_segment
*lseg
)
2049 struct inode
*inode
= hdr
->inode
;
2050 struct nfs_server
*nfss
= NFS_SERVER(inode
);
2051 enum pnfs_try_status trypnfs
;
2053 hdr
->mds_ops
= call_ops
;
2055 dprintk("%s: Reading ino:%lu %u@%llu\n",
2056 __func__
, inode
->i_ino
, hdr
->args
.count
, hdr
->args
.offset
);
2058 trypnfs
= nfss
->pnfs_curr_ld
->read_pagelist(hdr
);
2059 if (trypnfs
!= PNFS_NOT_ATTEMPTED
)
2060 nfs_inc_stats(inode
, NFSIOS_PNFS_READ
);
2061 dprintk("%s End (trypnfs:%d)\n", __func__
, trypnfs
);
2065 /* Resend all requests through pnfs. */
2066 int pnfs_read_resend_pnfs(struct nfs_pgio_header
*hdr
)
2068 struct nfs_pageio_descriptor pgio
;
2070 nfs_pageio_init_read(&pgio
, hdr
->inode
, false, hdr
->completion_ops
);
2071 return nfs_pageio_resend(&pgio
, hdr
);
2073 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs
);
2076 pnfs_do_read(struct nfs_pageio_descriptor
*desc
, struct nfs_pgio_header
*hdr
)
2078 const struct rpc_call_ops
*call_ops
= desc
->pg_rpc_callops
;
2079 struct pnfs_layout_segment
*lseg
= desc
->pg_lseg
;
2080 enum pnfs_try_status trypnfs
;
2083 trypnfs
= pnfs_try_to_read_data(hdr
, call_ops
, lseg
);
2084 if (trypnfs
== PNFS_TRY_AGAIN
)
2085 err
= pnfs_read_resend_pnfs(hdr
);
2086 if (trypnfs
== PNFS_NOT_ATTEMPTED
|| err
)
2087 pnfs_read_through_mds(desc
, hdr
);
2090 static void pnfs_readhdr_free(struct nfs_pgio_header
*hdr
)
2092 pnfs_put_lseg(hdr
->lseg
);
2093 nfs_pgio_header_free(hdr
);
2097 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor
*desc
)
2099 struct nfs_pgio_mirror
*mirror
= nfs_pgio_current_mirror(desc
);
2101 struct nfs_pgio_header
*hdr
;
2104 hdr
= nfs_pgio_header_alloc(desc
->pg_rw_ops
);
2106 desc
->pg_completion_ops
->error_cleanup(&mirror
->pg_list
);
2109 nfs_pgheader_init(desc
, hdr
, pnfs_readhdr_free
);
2110 hdr
->lseg
= pnfs_get_lseg(desc
->pg_lseg
);
2111 ret
= nfs_generic_pgio(desc
, hdr
);
2113 pnfs_do_read(desc
, hdr
);
2116 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages
);
2118 static void pnfs_clear_layoutcommitting(struct inode
*inode
)
2120 unsigned long *bitlock
= &NFS_I(inode
)->flags
;
2122 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING
, bitlock
);
2123 smp_mb__after_atomic();
2124 wake_up_bit(bitlock
, NFS_INO_LAYOUTCOMMITTING
);
2128 * There can be multiple RW segments.
2130 static void pnfs_list_write_lseg(struct inode
*inode
, struct list_head
*listp
)
2132 struct pnfs_layout_segment
*lseg
;
2134 list_for_each_entry(lseg
, &NFS_I(inode
)->layout
->plh_segs
, pls_list
) {
2135 if (lseg
->pls_range
.iomode
== IOMODE_RW
&&
2136 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
))
2137 list_add(&lseg
->pls_lc_list
, listp
);
2141 static void pnfs_list_write_lseg_done(struct inode
*inode
, struct list_head
*listp
)
2143 struct pnfs_layout_segment
*lseg
, *tmp
;
2145 /* Matched by references in pnfs_set_layoutcommit */
2146 list_for_each_entry_safe(lseg
, tmp
, listp
, pls_lc_list
) {
2147 list_del_init(&lseg
->pls_lc_list
);
2148 pnfs_put_lseg(lseg
);
2151 pnfs_clear_layoutcommitting(inode
);
2154 void pnfs_set_lo_fail(struct pnfs_layout_segment
*lseg
)
2156 pnfs_layout_io_set_failed(lseg
->pls_layout
, lseg
->pls_range
.iomode
);
2158 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail
);
2161 pnfs_set_layoutcommit(struct inode
*inode
, struct pnfs_layout_segment
*lseg
,
2164 struct nfs_inode
*nfsi
= NFS_I(inode
);
2165 bool mark_as_dirty
= false;
2167 spin_lock(&inode
->i_lock
);
2168 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
)) {
2169 nfsi
->layout
->plh_lwb
= end_pos
;
2170 mark_as_dirty
= true;
2171 dprintk("%s: Set layoutcommit for inode %lu ",
2172 __func__
, inode
->i_ino
);
2173 } else if (end_pos
> nfsi
->layout
->plh_lwb
)
2174 nfsi
->layout
->plh_lwb
= end_pos
;
2175 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
)) {
2176 /* references matched in nfs4_layoutcommit_release */
2177 pnfs_get_lseg(lseg
);
2179 spin_unlock(&inode
->i_lock
);
2180 dprintk("%s: lseg %p end_pos %llu\n",
2181 __func__
, lseg
, nfsi
->layout
->plh_lwb
);
2183 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2184 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2186 mark_inode_dirty_sync(inode
);
2188 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit
);
2190 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data
*data
)
2192 struct nfs_server
*nfss
= NFS_SERVER(data
->args
.inode
);
2194 if (nfss
->pnfs_curr_ld
->cleanup_layoutcommit
)
2195 nfss
->pnfs_curr_ld
->cleanup_layoutcommit(data
);
2196 pnfs_list_write_lseg_done(data
->args
.inode
, &data
->lseg_list
);
2200 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
2201 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
2202 * data to disk to allow the server to recover the data if it crashes.
2203 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
2204 * is off, and a COMMIT is sent to a data server, or
2205 * if WRITEs to a data server return NFS_DATA_SYNC.
2208 pnfs_layoutcommit_inode(struct inode
*inode
, bool sync
)
2210 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(inode
)->pnfs_curr_ld
;
2211 struct nfs4_layoutcommit_data
*data
;
2212 struct nfs_inode
*nfsi
= NFS_I(inode
);
2216 if (!pnfs_layoutcommit_outstanding(inode
))
2219 dprintk("--> %s inode %lu\n", __func__
, inode
->i_ino
);
2222 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING
, &nfsi
->flags
)) {
2225 status
= wait_on_bit_lock_action(&nfsi
->flags
,
2226 NFS_INO_LAYOUTCOMMITTING
,
2227 nfs_wait_bit_killable
,
2234 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
2235 data
= kzalloc(sizeof(*data
), GFP_NOFS
);
2237 goto clear_layoutcommitting
;
2240 spin_lock(&inode
->i_lock
);
2241 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
))
2244 INIT_LIST_HEAD(&data
->lseg_list
);
2245 pnfs_list_write_lseg(inode
, &data
->lseg_list
);
2247 end_pos
= nfsi
->layout
->plh_lwb
;
2249 nfs4_stateid_copy(&data
->args
.stateid
, &nfsi
->layout
->plh_stateid
);
2250 spin_unlock(&inode
->i_lock
);
2252 data
->args
.inode
= inode
;
2253 data
->cred
= get_rpccred(nfsi
->layout
->plh_lc_cred
);
2254 nfs_fattr_init(&data
->fattr
);
2255 data
->args
.bitmask
= NFS_SERVER(inode
)->cache_consistency_bitmask
;
2256 data
->res
.fattr
= &data
->fattr
;
2257 data
->args
.lastbytewritten
= end_pos
- 1;
2258 data
->res
.server
= NFS_SERVER(inode
);
2260 if (ld
->prepare_layoutcommit
) {
2261 status
= ld
->prepare_layoutcommit(&data
->args
);
2263 put_rpccred(data
->cred
);
2264 spin_lock(&inode
->i_lock
);
2265 set_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
);
2266 if (end_pos
> nfsi
->layout
->plh_lwb
)
2267 nfsi
->layout
->plh_lwb
= end_pos
;
2273 status
= nfs4_proc_layoutcommit(data
, sync
);
2276 mark_inode_dirty_sync(inode
);
2277 dprintk("<-- %s status %d\n", __func__
, status
);
2280 spin_unlock(&inode
->i_lock
);
2282 clear_layoutcommitting
:
2283 pnfs_clear_layoutcommitting(inode
);
2286 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode
);
2289 pnfs_generic_sync(struct inode
*inode
, bool datasync
)
2291 return pnfs_layoutcommit_inode(inode
, true);
2293 EXPORT_SYMBOL_GPL(pnfs_generic_sync
);
2295 struct nfs4_threshold
*pnfs_mdsthreshold_alloc(void)
2297 struct nfs4_threshold
*thp
;
2299 thp
= kzalloc(sizeof(*thp
), GFP_NOFS
);
2301 dprintk("%s mdsthreshold allocation failed\n", __func__
);
2307 #if IS_ENABLED(CONFIG_NFS_V4_2)
2309 pnfs_report_layoutstat(struct inode
*inode
, gfp_t gfp_flags
)
2311 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(inode
)->pnfs_curr_ld
;
2312 struct nfs_server
*server
= NFS_SERVER(inode
);
2313 struct nfs_inode
*nfsi
= NFS_I(inode
);
2314 struct nfs42_layoutstat_data
*data
;
2315 struct pnfs_layout_hdr
*hdr
;
2318 if (!pnfs_enabled_sb(server
) || !ld
->prepare_layoutstats
)
2321 if (!nfs_server_capable(inode
, NFS_CAP_LAYOUTSTATS
))
2324 if (test_and_set_bit(NFS_INO_LAYOUTSTATS
, &nfsi
->flags
))
2327 spin_lock(&inode
->i_lock
);
2328 if (!NFS_I(inode
)->layout
) {
2329 spin_unlock(&inode
->i_lock
);
2332 hdr
= NFS_I(inode
)->layout
;
2333 pnfs_get_layout_hdr(hdr
);
2334 spin_unlock(&inode
->i_lock
);
2336 data
= kzalloc(sizeof(*data
), gfp_flags
);
2342 data
->args
.fh
= NFS_FH(inode
);
2343 data
->args
.inode
= inode
;
2344 nfs4_stateid_copy(&data
->args
.stateid
, &hdr
->plh_stateid
);
2345 status
= ld
->prepare_layoutstats(&data
->args
);
2349 status
= nfs42_proc_layoutstats_generic(NFS_SERVER(inode
), data
);
2352 dprintk("%s returns %d\n", __func__
, status
);
2358 pnfs_put_layout_hdr(hdr
);
2359 smp_mb__before_atomic();
2360 clear_bit(NFS_INO_LAYOUTSTATS
, &nfsi
->flags
);
2361 smp_mb__after_atomic();
2364 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat
);
2367 unsigned int layoutstats_timer
;
2368 module_param(layoutstats_timer
, uint
, 0644);
2369 EXPORT_SYMBOL_GPL(layoutstats_timer
);