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_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
))
365 static void pnfs_layoutreturn_before_put_lseg(struct pnfs_layout_segment
*lseg
,
366 struct pnfs_layout_hdr
*lo
, struct inode
*inode
)
368 lo
= lseg
->pls_layout
;
369 inode
= lo
->plh_inode
;
371 spin_lock(&inode
->i_lock
);
372 if (pnfs_layout_need_return(lo
, lseg
)) {
373 nfs4_stateid stateid
;
374 enum pnfs_iomode iomode
;
376 stateid
= lo
->plh_stateid
;
377 iomode
= lo
->plh_return_iomode
;
378 /* decreased in pnfs_send_layoutreturn() */
379 lo
->plh_block_lgets
++;
380 lo
->plh_return_iomode
= 0;
381 spin_unlock(&inode
->i_lock
);
382 pnfs_get_layout_hdr(lo
);
384 /* Send an async layoutreturn so we dont deadlock */
385 pnfs_send_layoutreturn(lo
, stateid
, iomode
, false);
387 spin_unlock(&inode
->i_lock
);
391 pnfs_put_lseg(struct pnfs_layout_segment
*lseg
)
393 struct pnfs_layout_hdr
*lo
;
399 dprintk("%s: lseg %p ref %d valid %d\n", __func__
, lseg
,
400 atomic_read(&lseg
->pls_refcount
),
401 test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
));
403 /* Handle the case where refcount != 1 */
404 if (atomic_add_unless(&lseg
->pls_refcount
, -1, 1))
407 lo
= lseg
->pls_layout
;
408 inode
= lo
->plh_inode
;
409 /* Do we need a layoutreturn? */
410 if (test_bit(NFS_LSEG_LAYOUTRETURN
, &lseg
->pls_flags
))
411 pnfs_layoutreturn_before_put_lseg(lseg
, lo
, inode
);
413 if (atomic_dec_and_lock(&lseg
->pls_refcount
, &inode
->i_lock
)) {
414 pnfs_get_layout_hdr(lo
);
415 pnfs_layout_remove_lseg(lo
, lseg
);
416 spin_unlock(&inode
->i_lock
);
417 pnfs_free_lseg(lseg
);
418 pnfs_put_layout_hdr(lo
);
421 EXPORT_SYMBOL_GPL(pnfs_put_lseg
);
423 static void pnfs_free_lseg_async_work(struct work_struct
*work
)
425 struct pnfs_layout_segment
*lseg
;
426 struct pnfs_layout_hdr
*lo
;
428 lseg
= container_of(work
, struct pnfs_layout_segment
, pls_work
);
429 lo
= lseg
->pls_layout
;
431 pnfs_free_lseg(lseg
);
432 pnfs_put_layout_hdr(lo
);
435 static void pnfs_free_lseg_async(struct pnfs_layout_segment
*lseg
)
437 INIT_WORK(&lseg
->pls_work
, pnfs_free_lseg_async_work
);
438 schedule_work(&lseg
->pls_work
);
442 pnfs_put_lseg_locked(struct pnfs_layout_segment
*lseg
)
447 assert_spin_locked(&lseg
->pls_layout
->plh_inode
->i_lock
);
449 dprintk("%s: lseg %p ref %d valid %d\n", __func__
, lseg
,
450 atomic_read(&lseg
->pls_refcount
),
451 test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
));
452 if (atomic_dec_and_test(&lseg
->pls_refcount
)) {
453 struct pnfs_layout_hdr
*lo
= lseg
->pls_layout
;
454 pnfs_get_layout_hdr(lo
);
455 pnfs_layout_remove_lseg(lo
, lseg
);
456 pnfs_free_lseg_async(lseg
);
459 EXPORT_SYMBOL_GPL(pnfs_put_lseg_locked
);
462 end_offset(u64 start
, u64 len
)
467 return end
>= start
? end
: NFS4_MAX_UINT64
;
471 * is l2 fully contained in l1?
473 * [----------------------------------)
478 pnfs_lseg_range_contained(const struct pnfs_layout_range
*l1
,
479 const struct pnfs_layout_range
*l2
)
481 u64 start1
= l1
->offset
;
482 u64 end1
= end_offset(start1
, l1
->length
);
483 u64 start2
= l2
->offset
;
484 u64 end2
= end_offset(start2
, l2
->length
);
486 return (start1
<= start2
) && (end1
>= end2
);
490 * is l1 and l2 intersecting?
492 * [----------------------------------)
497 pnfs_lseg_range_intersecting(const struct pnfs_layout_range
*l1
,
498 const struct pnfs_layout_range
*l2
)
500 u64 start1
= l1
->offset
;
501 u64 end1
= end_offset(start1
, l1
->length
);
502 u64 start2
= l2
->offset
;
503 u64 end2
= end_offset(start2
, l2
->length
);
505 return (end1
== NFS4_MAX_UINT64
|| end1
> start2
) &&
506 (end2
== NFS4_MAX_UINT64
|| end2
> start1
);
510 should_free_lseg(const struct pnfs_layout_range
*lseg_range
,
511 const struct pnfs_layout_range
*recall_range
)
513 return (recall_range
->iomode
== IOMODE_ANY
||
514 lseg_range
->iomode
== recall_range
->iomode
) &&
515 pnfs_lseg_range_intersecting(lseg_range
, recall_range
);
518 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment
*lseg
,
519 struct list_head
*tmp_list
)
521 if (!atomic_dec_and_test(&lseg
->pls_refcount
))
523 pnfs_layout_remove_lseg(lseg
->pls_layout
, lseg
);
524 list_add(&lseg
->pls_list
, tmp_list
);
528 /* Returns 1 if lseg is removed from list, 0 otherwise */
529 static int mark_lseg_invalid(struct pnfs_layout_segment
*lseg
,
530 struct list_head
*tmp_list
)
534 if (test_and_clear_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
)) {
535 /* Remove the reference keeping the lseg in the
536 * list. It will now be removed when all
537 * outstanding io is finished.
539 dprintk("%s: lseg %p ref %d\n", __func__
, lseg
,
540 atomic_read(&lseg
->pls_refcount
));
541 if (pnfs_lseg_dec_and_remove_zero(lseg
, tmp_list
))
547 /* Returns count of number of matching invalid lsegs remaining in list
551 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr
*lo
,
552 struct list_head
*tmp_list
,
553 struct pnfs_layout_range
*recall_range
)
555 struct pnfs_layout_segment
*lseg
, *next
;
556 int invalid
= 0, removed
= 0;
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 dprintk("%s: freeing lseg %p iomode %d "
566 "offset %llu length %llu\n", __func__
,
567 lseg
, lseg
->pls_range
.iomode
, lseg
->pls_range
.offset
,
568 lseg
->pls_range
.length
);
570 removed
+= mark_lseg_invalid(lseg
, tmp_list
);
572 dprintk("%s:Return %i\n", __func__
, invalid
- removed
);
573 return invalid
- removed
;
576 /* note free_me must contain lsegs from a single layout_hdr */
578 pnfs_free_lseg_list(struct list_head
*free_me
)
580 struct pnfs_layout_segment
*lseg
, *tmp
;
582 if (list_empty(free_me
))
585 list_for_each_entry_safe(lseg
, tmp
, free_me
, pls_list
) {
586 list_del(&lseg
->pls_list
);
587 pnfs_free_lseg(lseg
);
592 pnfs_destroy_layout(struct nfs_inode
*nfsi
)
594 struct pnfs_layout_hdr
*lo
;
597 spin_lock(&nfsi
->vfs_inode
.i_lock
);
600 lo
->plh_block_lgets
++; /* permanently block new LAYOUTGETs */
601 pnfs_mark_matching_lsegs_invalid(lo
, &tmp_list
, NULL
);
602 pnfs_get_layout_hdr(lo
);
603 pnfs_layout_clear_fail_bit(lo
, NFS_LAYOUT_RO_FAILED
);
604 pnfs_layout_clear_fail_bit(lo
, NFS_LAYOUT_RW_FAILED
);
605 pnfs_clear_retry_layoutget(lo
);
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 struct pnfs_layout_range range
= {
665 .iomode
= IOMODE_ANY
,
667 .length
= NFS4_MAX_UINT64
,
669 LIST_HEAD(lseg_list
);
672 while (!list_empty(layout_list
)) {
673 lo
= list_entry(layout_list
->next
, struct pnfs_layout_hdr
,
675 dprintk("%s freeing layout for inode %lu\n", __func__
,
676 lo
->plh_inode
->i_ino
);
677 inode
= lo
->plh_inode
;
679 pnfs_layoutcommit_inode(inode
, false);
681 spin_lock(&inode
->i_lock
);
682 list_del_init(&lo
->plh_bulk_destroy
);
683 lo
->plh_block_lgets
++; /* permanently block new LAYOUTGETs */
685 set_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
);
686 if (pnfs_mark_matching_lsegs_invalid(lo
, &lseg_list
, &range
))
688 spin_unlock(&inode
->i_lock
);
689 pnfs_free_lseg_list(&lseg_list
);
690 pnfs_put_layout_hdr(lo
);
697 pnfs_destroy_layouts_byfsid(struct nfs_client
*clp
,
698 struct nfs_fsid
*fsid
,
701 struct nfs_server
*server
;
702 LIST_HEAD(layout_list
);
704 spin_lock(&clp
->cl_lock
);
707 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
708 if (memcmp(&server
->fsid
, fsid
, sizeof(*fsid
)) != 0)
710 if (pnfs_layout_bulk_destroy_byserver_locked(clp
,
716 spin_unlock(&clp
->cl_lock
);
718 if (list_empty(&layout_list
))
720 return pnfs_layout_free_bulk_destroy_list(&layout_list
, is_recall
);
724 pnfs_destroy_layouts_byclid(struct nfs_client
*clp
,
727 struct nfs_server
*server
;
728 LIST_HEAD(layout_list
);
730 spin_lock(&clp
->cl_lock
);
733 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
734 if (pnfs_layout_bulk_destroy_byserver_locked(clp
,
740 spin_unlock(&clp
->cl_lock
);
742 if (list_empty(&layout_list
))
744 return pnfs_layout_free_bulk_destroy_list(&layout_list
, is_recall
);
748 * Called by the state manger to remove all layouts established under an
752 pnfs_destroy_all_layouts(struct nfs_client
*clp
)
754 nfs4_deviceid_mark_client_invalid(clp
);
755 nfs4_deviceid_purge_client(clp
);
757 pnfs_destroy_layouts_byclid(clp
, false);
761 * Compare 2 layout stateid sequence ids, to see which is newer,
762 * taking into account wraparound issues.
764 static bool pnfs_seqid_is_newer(u32 s1
, u32 s2
)
766 return (s32
)(s1
- s2
) > 0;
769 /* update lo->plh_stateid with new if is more recent */
771 pnfs_set_layout_stateid(struct pnfs_layout_hdr
*lo
, const nfs4_stateid
*new,
774 u32 oldseq
, newseq
, new_barrier
;
775 int empty
= list_empty(&lo
->plh_segs
);
777 oldseq
= be32_to_cpu(lo
->plh_stateid
.seqid
);
778 newseq
= be32_to_cpu(new->seqid
);
779 if (empty
|| pnfs_seqid_is_newer(newseq
, oldseq
)) {
780 nfs4_stateid_copy(&lo
->plh_stateid
, new);
781 if (update_barrier
) {
782 new_barrier
= be32_to_cpu(new->seqid
);
784 /* Because of wraparound, we want to keep the barrier
785 * "close" to the current seqids.
787 new_barrier
= newseq
- atomic_read(&lo
->plh_outstanding
);
789 if (empty
|| pnfs_seqid_is_newer(new_barrier
, lo
->plh_barrier
))
790 lo
->plh_barrier
= new_barrier
;
795 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr
*lo
,
796 const nfs4_stateid
*stateid
)
798 u32 seqid
= be32_to_cpu(stateid
->seqid
);
800 return !pnfs_seqid_is_newer(seqid
, lo
->plh_barrier
);
804 pnfs_layout_returning(const struct pnfs_layout_hdr
*lo
,
805 struct pnfs_layout_range
*range
)
807 return test_bit(NFS_LAYOUT_RETURN
, &lo
->plh_flags
) &&
808 (lo
->plh_return_iomode
== IOMODE_ANY
||
809 lo
->plh_return_iomode
== range
->iomode
);
812 /* lget is set to 1 if called from inside send_layoutget call chain */
814 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr
*lo
,
815 struct pnfs_layout_range
*range
, int lget
)
817 return lo
->plh_block_lgets
||
818 test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
) ||
819 (list_empty(&lo
->plh_segs
) &&
820 (atomic_read(&lo
->plh_outstanding
) > lget
)) ||
821 pnfs_layout_returning(lo
, range
);
825 pnfs_choose_layoutget_stateid(nfs4_stateid
*dst
, struct pnfs_layout_hdr
*lo
,
826 struct pnfs_layout_range
*range
,
827 struct nfs4_state
*open_state
)
831 dprintk("--> %s\n", __func__
);
832 spin_lock(&lo
->plh_inode
->i_lock
);
833 if (pnfs_layoutgets_blocked(lo
, range
, 1)) {
835 } else if (!nfs4_valid_open_stateid(open_state
)) {
837 } else if (list_empty(&lo
->plh_segs
) ||
838 test_bit(NFS_LAYOUT_INVALID_STID
, &lo
->plh_flags
)) {
842 seq
= read_seqbegin(&open_state
->seqlock
);
843 nfs4_stateid_copy(dst
, &open_state
->stateid
);
844 } while (read_seqretry(&open_state
->seqlock
, seq
));
846 nfs4_stateid_copy(dst
, &lo
->plh_stateid
);
847 spin_unlock(&lo
->plh_inode
->i_lock
);
848 dprintk("<-- %s\n", __func__
);
853 * Get layout from server.
854 * for now, assume that whole file layouts are requested.
856 * arg->length: all ones
858 static struct pnfs_layout_segment
*
859 send_layoutget(struct pnfs_layout_hdr
*lo
,
860 struct nfs_open_context
*ctx
,
861 struct pnfs_layout_range
*range
,
864 struct inode
*ino
= lo
->plh_inode
;
865 struct nfs_server
*server
= NFS_SERVER(ino
);
866 struct nfs4_layoutget
*lgp
;
867 struct pnfs_layout_segment
*lseg
;
869 dprintk("--> %s\n", __func__
);
871 lgp
= kzalloc(sizeof(*lgp
), gfp_flags
);
875 lgp
->args
.minlength
= PAGE_CACHE_SIZE
;
876 if (lgp
->args
.minlength
> range
->length
)
877 lgp
->args
.minlength
= range
->length
;
878 lgp
->args
.maxcount
= PNFS_LAYOUT_MAXSIZE
;
879 lgp
->args
.range
= *range
;
880 lgp
->args
.type
= server
->pnfs_curr_ld
->id
;
881 lgp
->args
.inode
= ino
;
882 lgp
->args
.ctx
= get_nfs_open_context(ctx
);
883 lgp
->gfp_flags
= gfp_flags
;
884 lgp
->cred
= lo
->plh_lc_cred
;
886 /* Synchronously retrieve layout information from server and
889 lseg
= nfs4_proc_layoutget(lgp
, gfp_flags
);
891 switch (PTR_ERR(lseg
)) {
896 /* remember that LAYOUTGET failed and suspend trying */
897 pnfs_layout_io_set_failed(lo
, range
->iomode
);
901 pnfs_layout_clear_fail_bit(lo
,
902 pnfs_iomode_to_fail_bit(range
->iomode
));
907 static void pnfs_clear_layoutcommit(struct inode
*inode
,
908 struct list_head
*head
)
910 struct nfs_inode
*nfsi
= NFS_I(inode
);
911 struct pnfs_layout_segment
*lseg
, *tmp
;
913 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
))
915 list_for_each_entry_safe(lseg
, tmp
, &nfsi
->layout
->plh_segs
, pls_list
) {
916 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
))
918 pnfs_lseg_dec_and_remove_zero(lseg
, head
);
922 void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr
*lo
)
924 clear_bit_unlock(NFS_LAYOUT_RETURN
, &lo
->plh_flags
);
925 smp_mb__after_atomic();
926 wake_up_bit(&lo
->plh_flags
, NFS_LAYOUT_RETURN
);
930 pnfs_send_layoutreturn(struct pnfs_layout_hdr
*lo
, nfs4_stateid stateid
,
931 enum pnfs_iomode iomode
, bool sync
)
933 struct inode
*ino
= lo
->plh_inode
;
934 struct nfs4_layoutreturn
*lrp
;
937 lrp
= kzalloc(sizeof(*lrp
), GFP_NOFS
);
938 if (unlikely(lrp
== NULL
)) {
940 spin_lock(&ino
->i_lock
);
941 lo
->plh_block_lgets
--;
942 pnfs_clear_layoutreturn_waitbit(lo
);
943 rpc_wake_up(&NFS_SERVER(ino
)->roc_rpcwaitq
);
944 spin_unlock(&ino
->i_lock
);
945 pnfs_put_layout_hdr(lo
);
949 lrp
->args
.stateid
= stateid
;
950 lrp
->args
.layout_type
= NFS_SERVER(ino
)->pnfs_curr_ld
->id
;
951 lrp
->args
.inode
= ino
;
952 lrp
->args
.range
.iomode
= iomode
;
953 lrp
->args
.range
.offset
= 0;
954 lrp
->args
.range
.length
= NFS4_MAX_UINT64
;
955 lrp
->args
.layout
= lo
;
956 lrp
->clp
= NFS_SERVER(ino
)->nfs_client
;
957 lrp
->cred
= lo
->plh_lc_cred
;
959 status
= nfs4_proc_layoutreturn(lrp
, sync
);
961 dprintk("<-- %s status: %d\n", __func__
, status
);
966 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
967 * when the layout segment list is empty.
969 * Note that a pnfs_layout_hdr can exist with an empty layout segment
970 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
971 * deviceid is marked invalid.
974 _pnfs_return_layout(struct inode
*ino
)
976 struct pnfs_layout_hdr
*lo
= NULL
;
977 struct nfs_inode
*nfsi
= NFS_I(ino
);
979 nfs4_stateid stateid
;
980 int status
= 0, empty
;
982 dprintk("NFS: %s for inode %lu\n", __func__
, ino
->i_ino
);
984 spin_lock(&ino
->i_lock
);
987 spin_unlock(&ino
->i_lock
);
988 dprintk("NFS: %s no layout to return\n", __func__
);
991 stateid
= nfsi
->layout
->plh_stateid
;
992 /* Reference matched in nfs4_layoutreturn_release */
993 pnfs_get_layout_hdr(lo
);
994 empty
= list_empty(&lo
->plh_segs
);
995 pnfs_clear_layoutcommit(ino
, &tmp_list
);
996 pnfs_mark_matching_lsegs_invalid(lo
, &tmp_list
, NULL
);
998 if (NFS_SERVER(ino
)->pnfs_curr_ld
->return_range
) {
999 struct pnfs_layout_range range
= {
1000 .iomode
= IOMODE_ANY
,
1002 .length
= NFS4_MAX_UINT64
,
1004 NFS_SERVER(ino
)->pnfs_curr_ld
->return_range(lo
, &range
);
1007 /* Don't send a LAYOUTRETURN if list was initially empty */
1009 spin_unlock(&ino
->i_lock
);
1010 pnfs_put_layout_hdr(lo
);
1011 dprintk("NFS: %s no layout segments to return\n", __func__
);
1015 set_bit(NFS_LAYOUT_INVALID_STID
, &lo
->plh_flags
);
1016 lo
->plh_block_lgets
++;
1017 spin_unlock(&ino
->i_lock
);
1018 pnfs_free_lseg_list(&tmp_list
);
1020 status
= pnfs_send_layoutreturn(lo
, stateid
, IOMODE_ANY
, true);
1022 dprintk("<-- %s status: %d\n", __func__
, status
);
1025 EXPORT_SYMBOL_GPL(_pnfs_return_layout
);
1028 pnfs_commit_and_return_layout(struct inode
*inode
)
1030 struct pnfs_layout_hdr
*lo
;
1033 spin_lock(&inode
->i_lock
);
1034 lo
= NFS_I(inode
)->layout
;
1036 spin_unlock(&inode
->i_lock
);
1039 pnfs_get_layout_hdr(lo
);
1040 /* Block new layoutgets and read/write to ds */
1041 lo
->plh_block_lgets
++;
1042 spin_unlock(&inode
->i_lock
);
1043 filemap_fdatawait(inode
->i_mapping
);
1044 ret
= pnfs_layoutcommit_inode(inode
, true);
1046 ret
= _pnfs_return_layout(inode
);
1047 spin_lock(&inode
->i_lock
);
1048 lo
->plh_block_lgets
--;
1049 spin_unlock(&inode
->i_lock
);
1050 pnfs_put_layout_hdr(lo
);
1054 bool pnfs_roc(struct inode
*ino
)
1056 struct nfs_inode
*nfsi
= NFS_I(ino
);
1057 struct nfs_open_context
*ctx
;
1058 struct nfs4_state
*state
;
1059 struct pnfs_layout_hdr
*lo
;
1060 struct pnfs_layout_segment
*lseg
, *tmp
;
1061 nfs4_stateid stateid
;
1062 LIST_HEAD(tmp_list
);
1063 bool found
= false, layoutreturn
= false;
1065 spin_lock(&ino
->i_lock
);
1067 if (!lo
|| !test_and_clear_bit(NFS_LAYOUT_ROC
, &lo
->plh_flags
) ||
1068 test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
))
1071 /* Don't return layout if we hold a delegation */
1072 if (nfs4_check_delegation(ino
, FMODE_READ
))
1075 list_for_each_entry(ctx
, &nfsi
->open_files
, list
) {
1077 /* Don't return layout if there is open file state */
1078 if (state
!= NULL
&& state
->state
!= 0)
1082 pnfs_clear_retry_layoutget(lo
);
1083 list_for_each_entry_safe(lseg
, tmp
, &lo
->plh_segs
, pls_list
)
1084 if (test_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
)) {
1085 mark_lseg_invalid(lseg
, &tmp_list
);
1090 lo
->plh_block_lgets
++;
1091 pnfs_get_layout_hdr(lo
); /* matched in pnfs_roc_release */
1092 spin_unlock(&ino
->i_lock
);
1093 pnfs_free_lseg_list(&tmp_list
);
1094 pnfs_layoutcommit_inode(ino
, true);
1099 stateid
= lo
->plh_stateid
;
1101 test_and_clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE
,
1104 lo
->plh_block_lgets
++;
1105 pnfs_get_layout_hdr(lo
);
1108 spin_unlock(&ino
->i_lock
);
1110 pnfs_layoutcommit_inode(ino
, true);
1111 pnfs_send_layoutreturn(lo
, stateid
, IOMODE_ANY
, true);
1116 void pnfs_roc_release(struct inode
*ino
)
1118 struct pnfs_layout_hdr
*lo
;
1120 spin_lock(&ino
->i_lock
);
1121 lo
= NFS_I(ino
)->layout
;
1122 lo
->plh_block_lgets
--;
1123 if (atomic_dec_and_test(&lo
->plh_refcount
)) {
1124 pnfs_detach_layout_hdr(lo
);
1125 spin_unlock(&ino
->i_lock
);
1126 pnfs_free_layout_hdr(lo
);
1128 spin_unlock(&ino
->i_lock
);
1131 void pnfs_roc_set_barrier(struct inode
*ino
, u32 barrier
)
1133 struct pnfs_layout_hdr
*lo
;
1135 spin_lock(&ino
->i_lock
);
1136 lo
= NFS_I(ino
)->layout
;
1137 if (pnfs_seqid_is_newer(barrier
, lo
->plh_barrier
))
1138 lo
->plh_barrier
= barrier
;
1139 spin_unlock(&ino
->i_lock
);
1142 bool pnfs_roc_drain(struct inode
*ino
, u32
*barrier
, struct rpc_task
*task
)
1144 struct nfs_inode
*nfsi
= NFS_I(ino
);
1145 struct pnfs_layout_hdr
*lo
;
1146 struct pnfs_layout_segment
*lseg
;
1147 nfs4_stateid stateid
;
1149 bool found
= false, layoutreturn
= false;
1151 spin_lock(&ino
->i_lock
);
1152 list_for_each_entry(lseg
, &nfsi
->layout
->plh_segs
, pls_list
)
1153 if (test_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
)) {
1154 rpc_sleep_on(&NFS_SERVER(ino
)->roc_rpcwaitq
, task
, NULL
);
1159 current_seqid
= be32_to_cpu(lo
->plh_stateid
.seqid
);
1161 /* Since close does not return a layout stateid for use as
1162 * a barrier, we choose the worst-case barrier.
1164 *barrier
= current_seqid
+ atomic_read(&lo
->plh_outstanding
);
1167 stateid
= lo
->plh_stateid
;
1169 test_and_clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE
,
1172 lo
->plh_block_lgets
++;
1173 pnfs_get_layout_hdr(lo
);
1176 spin_unlock(&ino
->i_lock
);
1178 rpc_sleep_on(&NFS_SERVER(ino
)->roc_rpcwaitq
, task
, NULL
);
1179 pnfs_send_layoutreturn(lo
, stateid
, IOMODE_ANY
, false);
1185 * Compare two layout segments for sorting into layout cache.
1186 * We want to preferentially return RW over RO layouts, so ensure those
1190 pnfs_lseg_range_cmp(const struct pnfs_layout_range
*l1
,
1191 const struct pnfs_layout_range
*l2
)
1195 /* high offset > low offset */
1196 d
= l1
->offset
- l2
->offset
;
1200 /* short length > long length */
1201 d
= l2
->length
- l1
->length
;
1205 /* read > read/write */
1206 return (int)(l1
->iomode
== IOMODE_READ
) - (int)(l2
->iomode
== IOMODE_READ
);
1210 pnfs_layout_insert_lseg(struct pnfs_layout_hdr
*lo
,
1211 struct pnfs_layout_segment
*lseg
)
1213 struct pnfs_layout_segment
*lp
;
1215 dprintk("%s:Begin\n", __func__
);
1217 list_for_each_entry(lp
, &lo
->plh_segs
, pls_list
) {
1218 if (pnfs_lseg_range_cmp(&lseg
->pls_range
, &lp
->pls_range
) > 0)
1220 list_add_tail(&lseg
->pls_list
, &lp
->pls_list
);
1221 dprintk("%s: inserted lseg %p "
1222 "iomode %d offset %llu length %llu before "
1223 "lp %p iomode %d offset %llu length %llu\n",
1224 __func__
, lseg
, lseg
->pls_range
.iomode
,
1225 lseg
->pls_range
.offset
, lseg
->pls_range
.length
,
1226 lp
, lp
->pls_range
.iomode
, lp
->pls_range
.offset
,
1227 lp
->pls_range
.length
);
1230 list_add_tail(&lseg
->pls_list
, &lo
->plh_segs
);
1231 dprintk("%s: inserted lseg %p "
1232 "iomode %d offset %llu length %llu at tail\n",
1233 __func__
, lseg
, lseg
->pls_range
.iomode
,
1234 lseg
->pls_range
.offset
, lseg
->pls_range
.length
);
1236 pnfs_get_layout_hdr(lo
);
1238 dprintk("%s:Return\n", __func__
);
1241 static struct pnfs_layout_hdr
*
1242 alloc_init_layout_hdr(struct inode
*ino
,
1243 struct nfs_open_context
*ctx
,
1246 struct pnfs_layout_hdr
*lo
;
1248 lo
= pnfs_alloc_layout_hdr(ino
, gfp_flags
);
1251 atomic_set(&lo
->plh_refcount
, 1);
1252 INIT_LIST_HEAD(&lo
->plh_layouts
);
1253 INIT_LIST_HEAD(&lo
->plh_segs
);
1254 INIT_LIST_HEAD(&lo
->plh_bulk_destroy
);
1255 lo
->plh_inode
= ino
;
1256 lo
->plh_lc_cred
= get_rpccred(ctx
->cred
);
1260 static struct pnfs_layout_hdr
*
1261 pnfs_find_alloc_layout(struct inode
*ino
,
1262 struct nfs_open_context
*ctx
,
1265 struct nfs_inode
*nfsi
= NFS_I(ino
);
1266 struct pnfs_layout_hdr
*new = NULL
;
1268 dprintk("%s Begin ino=%p layout=%p\n", __func__
, ino
, nfsi
->layout
);
1270 if (nfsi
->layout
!= NULL
)
1272 spin_unlock(&ino
->i_lock
);
1273 new = alloc_init_layout_hdr(ino
, ctx
, gfp_flags
);
1274 spin_lock(&ino
->i_lock
);
1276 if (likely(nfsi
->layout
== NULL
)) { /* Won the race? */
1279 } else if (new != NULL
)
1280 pnfs_free_layout_hdr(new);
1282 pnfs_get_layout_hdr(nfsi
->layout
);
1283 return nfsi
->layout
;
1287 * iomode matching rules:
1298 pnfs_lseg_range_match(const struct pnfs_layout_range
*ls_range
,
1299 const struct pnfs_layout_range
*range
)
1301 struct pnfs_layout_range range1
;
1303 if ((range
->iomode
== IOMODE_RW
&&
1304 ls_range
->iomode
!= IOMODE_RW
) ||
1305 !pnfs_lseg_range_intersecting(ls_range
, range
))
1308 /* range1 covers only the first byte in the range */
1311 return pnfs_lseg_range_contained(ls_range
, &range1
);
1315 * lookup range in layout
1317 static struct pnfs_layout_segment
*
1318 pnfs_find_lseg(struct pnfs_layout_hdr
*lo
,
1319 struct pnfs_layout_range
*range
)
1321 struct pnfs_layout_segment
*lseg
, *ret
= NULL
;
1323 dprintk("%s:Begin\n", __func__
);
1325 list_for_each_entry(lseg
, &lo
->plh_segs
, pls_list
) {
1326 if (test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
) &&
1327 !test_bit(NFS_LSEG_LAYOUTRETURN
, &lseg
->pls_flags
) &&
1328 pnfs_lseg_range_match(&lseg
->pls_range
, range
)) {
1329 ret
= pnfs_get_lseg(lseg
);
1332 if (lseg
->pls_range
.offset
> range
->offset
)
1336 dprintk("%s:Return lseg %p ref %d\n",
1337 __func__
, ret
, ret
? atomic_read(&ret
->pls_refcount
) : 0);
1342 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1343 * to the MDS or over pNFS
1345 * The nfs_inode read_io and write_io fields are cumulative counters reset
1346 * when there are no layout segments. Note that in pnfs_update_layout iomode
1347 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1350 * A return of true means use MDS I/O.
1353 * If a file's size is smaller than the file size threshold, data accesses
1354 * SHOULD be sent to the metadata server. If an I/O request has a length that
1355 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1356 * server. If both file size and I/O size are provided, the client SHOULD
1357 * reach or exceed both thresholds before sending its read or write
1358 * requests to the data server.
1360 static bool pnfs_within_mdsthreshold(struct nfs_open_context
*ctx
,
1361 struct inode
*ino
, int iomode
)
1363 struct nfs4_threshold
*t
= ctx
->mdsthreshold
;
1364 struct nfs_inode
*nfsi
= NFS_I(ino
);
1365 loff_t fsize
= i_size_read(ino
);
1366 bool size
= false, size_set
= false, io
= false, io_set
= false, ret
= false;
1371 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1372 __func__
, t
->bm
, t
->rd_sz
, t
->wr_sz
, t
->rd_io_sz
, t
->wr_io_sz
);
1376 if (t
->bm
& THRESHOLD_RD
) {
1377 dprintk("%s fsize %llu\n", __func__
, fsize
);
1379 if (fsize
< t
->rd_sz
)
1382 if (t
->bm
& THRESHOLD_RD_IO
) {
1383 dprintk("%s nfsi->read_io %llu\n", __func__
,
1386 if (nfsi
->read_io
< t
->rd_io_sz
)
1391 if (t
->bm
& THRESHOLD_WR
) {
1392 dprintk("%s fsize %llu\n", __func__
, fsize
);
1394 if (fsize
< t
->wr_sz
)
1397 if (t
->bm
& THRESHOLD_WR_IO
) {
1398 dprintk("%s nfsi->write_io %llu\n", __func__
,
1401 if (nfsi
->write_io
< t
->wr_io_sz
)
1406 if (size_set
&& io_set
) {
1409 } else if (size
|| io
)
1412 dprintk("<-- %s size %d io %d ret %d\n", __func__
, size
, io
, ret
);
1416 /* stop waiting if someone clears NFS_LAYOUT_RETRY_LAYOUTGET bit. */
1417 static int pnfs_layoutget_retry_bit_wait(struct wait_bit_key
*key
)
1419 if (!test_bit(NFS_LAYOUT_RETRY_LAYOUTGET
, key
->flags
))
1421 return nfs_wait_bit_killable(key
);
1424 static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr
*lo
)
1427 * send layoutcommit as it can hold up layoutreturn due to lseg
1430 pnfs_layoutcommit_inode(lo
->plh_inode
, false);
1431 return !wait_on_bit_action(&lo
->plh_flags
, NFS_LAYOUT_RETURN
,
1432 pnfs_layoutget_retry_bit_wait
,
1433 TASK_UNINTERRUPTIBLE
);
1436 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr
*lo
)
1438 unsigned long *bitlock
= &lo
->plh_flags
;
1440 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET
, bitlock
);
1441 smp_mb__after_atomic();
1442 wake_up_bit(bitlock
, NFS_LAYOUT_FIRST_LAYOUTGET
);
1446 * Layout segment is retreived from the server if not cached.
1447 * The appropriate layout segment is referenced and returned to the caller.
1449 struct pnfs_layout_segment
*
1450 pnfs_update_layout(struct inode
*ino
,
1451 struct nfs_open_context
*ctx
,
1454 enum pnfs_iomode iomode
,
1457 struct pnfs_layout_range arg
= {
1463 struct nfs_server
*server
= NFS_SERVER(ino
);
1464 struct nfs_client
*clp
= server
->nfs_client
;
1465 struct pnfs_layout_hdr
*lo
;
1466 struct pnfs_layout_segment
*lseg
= NULL
;
1469 if (!pnfs_enabled_sb(NFS_SERVER(ino
)))
1472 if (pnfs_within_mdsthreshold(ctx
, ino
, iomode
))
1477 spin_lock(&ino
->i_lock
);
1478 lo
= pnfs_find_alloc_layout(ino
, ctx
, gfp_flags
);
1480 spin_unlock(&ino
->i_lock
);
1484 /* Do we even need to bother with this? */
1485 if (test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
)) {
1486 dprintk("%s matches recall, use MDS\n", __func__
);
1490 /* if LAYOUTGET already failed once we don't try again */
1491 if (pnfs_layout_io_test_failed(lo
, iomode
) &&
1492 !pnfs_should_retry_layoutget(lo
))
1495 first
= list_empty(&lo
->plh_segs
);
1497 /* The first layoutget for the file. Need to serialize per
1498 * RFC 5661 Errata 3208.
1500 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET
,
1502 spin_unlock(&ino
->i_lock
);
1503 wait_on_bit(&lo
->plh_flags
, NFS_LAYOUT_FIRST_LAYOUTGET
,
1504 TASK_UNINTERRUPTIBLE
);
1505 pnfs_put_layout_hdr(lo
);
1509 /* Check to see if the layout for the given range
1512 lseg
= pnfs_find_lseg(lo
, &arg
);
1518 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
1519 * for LAYOUTRETURN even if first is true.
1521 if (!lseg
&& pnfs_should_retry_layoutget(lo
) &&
1522 test_bit(NFS_LAYOUT_RETURN
, &lo
->plh_flags
)) {
1523 spin_unlock(&ino
->i_lock
);
1524 dprintk("%s wait for layoutreturn\n", __func__
);
1525 if (pnfs_prepare_to_retry_layoutget(lo
)) {
1527 pnfs_clear_first_layoutget(lo
);
1528 pnfs_put_layout_hdr(lo
);
1529 dprintk("%s retrying\n", __func__
);
1532 goto out_put_layout_hdr
;
1535 if (pnfs_layoutgets_blocked(lo
, &arg
, 0))
1537 atomic_inc(&lo
->plh_outstanding
);
1538 spin_unlock(&ino
->i_lock
);
1540 if (list_empty(&lo
->plh_layouts
)) {
1541 /* The lo must be on the clp list if there is any
1542 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1544 spin_lock(&clp
->cl_lock
);
1545 if (list_empty(&lo
->plh_layouts
))
1546 list_add_tail(&lo
->plh_layouts
, &server
->layouts
);
1547 spin_unlock(&clp
->cl_lock
);
1550 pg_offset
= arg
.offset
& ~PAGE_CACHE_MASK
;
1552 arg
.offset
-= pg_offset
;
1553 arg
.length
+= pg_offset
;
1555 if (arg
.length
!= NFS4_MAX_UINT64
)
1556 arg
.length
= PAGE_CACHE_ALIGN(arg
.length
);
1558 lseg
= send_layoutget(lo
, ctx
, &arg
, gfp_flags
);
1559 pnfs_clear_retry_layoutget(lo
);
1560 atomic_dec(&lo
->plh_outstanding
);
1563 pnfs_clear_first_layoutget(lo
);
1564 pnfs_put_layout_hdr(lo
);
1566 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1567 "(%s, offset: %llu, length: %llu)\n",
1568 __func__
, ino
->i_sb
->s_id
,
1569 (unsigned long long)NFS_FILEID(ino
),
1570 lseg
== NULL
? "not found" : "found",
1571 iomode
==IOMODE_RW
? "read/write" : "read-only",
1572 (unsigned long long)pos
,
1573 (unsigned long long)count
);
1576 spin_unlock(&ino
->i_lock
);
1577 goto out_put_layout_hdr
;
1579 EXPORT_SYMBOL_GPL(pnfs_update_layout
);
1581 struct pnfs_layout_segment
*
1582 pnfs_layout_process(struct nfs4_layoutget
*lgp
)
1584 struct pnfs_layout_hdr
*lo
= NFS_I(lgp
->args
.inode
)->layout
;
1585 struct nfs4_layoutget_res
*res
= &lgp
->res
;
1586 struct pnfs_layout_segment
*lseg
;
1587 struct inode
*ino
= lo
->plh_inode
;
1591 /* Inject layout blob into I/O device driver */
1592 lseg
= NFS_SERVER(ino
)->pnfs_curr_ld
->alloc_lseg(lo
, res
, lgp
->gfp_flags
);
1593 if (!lseg
|| IS_ERR(lseg
)) {
1597 status
= PTR_ERR(lseg
);
1598 dprintk("%s: Could not allocate layout: error %d\n",
1603 init_lseg(lo
, lseg
);
1604 lseg
->pls_range
= res
->range
;
1606 spin_lock(&ino
->i_lock
);
1607 if (test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
)) {
1608 dprintk("%s forget reply due to recall\n", __func__
);
1609 goto out_forget_reply
;
1612 if (pnfs_layoutgets_blocked(lo
, &lgp
->args
.range
, 1)) {
1613 dprintk("%s forget reply due to state\n", __func__
);
1614 goto out_forget_reply
;
1617 if (nfs4_stateid_match_other(&lo
->plh_stateid
, &res
->stateid
)) {
1618 /* existing state ID, make sure the sequence number matches. */
1619 if (pnfs_layout_stateid_blocked(lo
, &res
->stateid
)) {
1620 dprintk("%s forget reply due to sequence\n", __func__
);
1621 goto out_forget_reply
;
1623 pnfs_set_layout_stateid(lo
, &res
->stateid
, false);
1626 * We got an entirely new state ID. Mark all segments for the
1627 * inode invalid, and don't bother validating the stateid
1630 pnfs_mark_matching_lsegs_invalid(lo
, &free_me
, NULL
);
1632 nfs4_stateid_copy(&lo
->plh_stateid
, &res
->stateid
);
1633 lo
->plh_barrier
= be32_to_cpu(res
->stateid
.seqid
);
1636 clear_bit(NFS_LAYOUT_INVALID_STID
, &lo
->plh_flags
);
1638 pnfs_get_lseg(lseg
);
1639 pnfs_layout_insert_lseg(lo
, lseg
);
1641 if (res
->return_on_close
) {
1642 set_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
);
1643 set_bit(NFS_LAYOUT_ROC
, &lo
->plh_flags
);
1646 spin_unlock(&ino
->i_lock
);
1647 pnfs_free_lseg_list(&free_me
);
1650 return ERR_PTR(status
);
1653 spin_unlock(&ino
->i_lock
);
1654 lseg
->pls_layout
= lo
;
1655 NFS_SERVER(ino
)->pnfs_curr_ld
->free_lseg(lseg
);
1660 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr
*lo
,
1661 struct list_head
*tmp_list
,
1662 struct pnfs_layout_range
*return_range
)
1664 struct pnfs_layout_segment
*lseg
, *next
;
1666 dprintk("%s:Begin lo %p\n", __func__
, lo
);
1668 if (list_empty(&lo
->plh_segs
))
1671 list_for_each_entry_safe(lseg
, next
, &lo
->plh_segs
, pls_list
)
1672 if (should_free_lseg(&lseg
->pls_range
, return_range
)) {
1673 dprintk("%s: marking lseg %p iomode %d "
1674 "offset %llu length %llu\n", __func__
,
1675 lseg
, lseg
->pls_range
.iomode
,
1676 lseg
->pls_range
.offset
,
1677 lseg
->pls_range
.length
);
1678 set_bit(NFS_LSEG_LAYOUTRETURN
, &lseg
->pls_flags
);
1679 mark_lseg_invalid(lseg
, tmp_list
);
1683 void pnfs_error_mark_layout_for_return(struct inode
*inode
,
1684 struct pnfs_layout_segment
*lseg
)
1686 struct pnfs_layout_hdr
*lo
= NFS_I(inode
)->layout
;
1687 int iomode
= pnfs_iomode_to_fail_bit(lseg
->pls_range
.iomode
);
1688 struct pnfs_layout_range range
= {
1689 .iomode
= lseg
->pls_range
.iomode
,
1691 .length
= NFS4_MAX_UINT64
,
1695 spin_lock(&inode
->i_lock
);
1696 /* set failure bit so that pnfs path will be retried later */
1697 pnfs_layout_set_fail_bit(lo
, iomode
);
1698 set_bit(NFS_LAYOUT_RETURN
, &lo
->plh_flags
);
1699 if (lo
->plh_return_iomode
== 0)
1700 lo
->plh_return_iomode
= range
.iomode
;
1701 else if (lo
->plh_return_iomode
!= range
.iomode
)
1702 lo
->plh_return_iomode
= IOMODE_ANY
;
1704 * mark all matching lsegs so that we are sure to have no live
1705 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
1708 pnfs_mark_matching_lsegs_return(lo
, &free_me
, &range
);
1709 spin_unlock(&inode
->i_lock
);
1710 pnfs_free_lseg_list(&free_me
);
1712 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return
);
1715 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*req
)
1717 u64 rd_size
= req
->wb_bytes
;
1719 if (pgio
->pg_lseg
== NULL
) {
1720 if (pgio
->pg_dreq
== NULL
)
1721 rd_size
= i_size_read(pgio
->pg_inode
) - req_offset(req
);
1723 rd_size
= nfs_dreq_bytes_left(pgio
->pg_dreq
);
1725 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
1732 /* If no lseg, fall back to read through mds */
1733 if (pgio
->pg_lseg
== NULL
)
1734 nfs_pageio_reset_read_mds(pgio
);
1737 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read
);
1740 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor
*pgio
,
1741 struct nfs_page
*req
, u64 wb_size
)
1743 if (pgio
->pg_lseg
== NULL
)
1744 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
1750 /* If no lseg, fall back to write through mds */
1751 if (pgio
->pg_lseg
== NULL
)
1752 nfs_pageio_reset_write_mds(pgio
);
1754 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write
);
1757 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor
*desc
)
1759 if (desc
->pg_lseg
) {
1760 pnfs_put_lseg(desc
->pg_lseg
);
1761 desc
->pg_lseg
= NULL
;
1764 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup
);
1767 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
1768 * of bytes (maximum @req->wb_bytes) that can be coalesced.
1771 pnfs_generic_pg_test(struct nfs_pageio_descriptor
*pgio
,
1772 struct nfs_page
*prev
, struct nfs_page
*req
)
1775 u64 seg_end
, req_start
, seg_left
;
1777 size
= nfs_generic_pg_test(pgio
, prev
, req
);
1782 * 'size' contains the number of bytes left in the current page (up
1783 * to the original size asked for in @req->wb_bytes).
1785 * Calculate how many bytes are left in the layout segment
1786 * and if there are less bytes than 'size', return that instead.
1788 * Please also note that 'end_offset' is actually the offset of the
1789 * first byte that lies outside the pnfs_layout_range. FIXME?
1792 if (pgio
->pg_lseg
) {
1793 seg_end
= end_offset(pgio
->pg_lseg
->pls_range
.offset
,
1794 pgio
->pg_lseg
->pls_range
.length
);
1795 req_start
= req_offset(req
);
1796 WARN_ON_ONCE(req_start
>= seg_end
);
1797 /* start of request is past the last byte of this segment */
1798 if (req_start
>= seg_end
) {
1799 /* reference the new lseg */
1800 if (pgio
->pg_ops
->pg_cleanup
)
1801 pgio
->pg_ops
->pg_cleanup(pgio
);
1802 if (pgio
->pg_ops
->pg_init
)
1803 pgio
->pg_ops
->pg_init(pgio
, req
);
1807 /* adjust 'size' iff there are fewer bytes left in the
1808 * segment than what nfs_generic_pg_test returned */
1809 seg_left
= seg_end
- req_start
;
1810 if (seg_left
< size
)
1811 size
= (unsigned int)seg_left
;
1816 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test
);
1818 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header
*hdr
)
1820 struct nfs_pageio_descriptor pgio
;
1822 /* Resend all requests through the MDS */
1823 nfs_pageio_init_write(&pgio
, hdr
->inode
, FLUSH_STABLE
, true,
1824 hdr
->completion_ops
);
1825 set_bit(NFS_CONTEXT_RESEND_WRITES
, &hdr
->args
.context
->flags
);
1826 return nfs_pageio_resend(&pgio
, hdr
);
1828 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds
);
1830 static void pnfs_ld_handle_write_error(struct nfs_pgio_header
*hdr
)
1833 dprintk("pnfs write error = %d\n", hdr
->pnfs_error
);
1834 if (NFS_SERVER(hdr
->inode
)->pnfs_curr_ld
->flags
&
1835 PNFS_LAYOUTRET_ON_ERROR
) {
1836 pnfs_return_layout(hdr
->inode
);
1838 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
))
1839 hdr
->task
.tk_status
= pnfs_write_done_resend_to_mds(hdr
);
1843 * Called by non rpc-based layout drivers
1845 void pnfs_ld_write_done(struct nfs_pgio_header
*hdr
)
1847 trace_nfs4_pnfs_write(hdr
, hdr
->pnfs_error
);
1848 if (!hdr
->pnfs_error
) {
1849 pnfs_set_layoutcommit(hdr
->inode
, hdr
->lseg
,
1850 hdr
->mds_offset
+ hdr
->res
.count
);
1851 hdr
->mds_ops
->rpc_call_done(&hdr
->task
, hdr
);
1853 pnfs_ld_handle_write_error(hdr
);
1854 hdr
->mds_ops
->rpc_release(hdr
);
1856 EXPORT_SYMBOL_GPL(pnfs_ld_write_done
);
1859 pnfs_write_through_mds(struct nfs_pageio_descriptor
*desc
,
1860 struct nfs_pgio_header
*hdr
)
1862 struct nfs_pgio_mirror
*mirror
= nfs_pgio_current_mirror(desc
);
1864 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
1865 list_splice_tail_init(&hdr
->pages
, &mirror
->pg_list
);
1866 nfs_pageio_reset_write_mds(desc
);
1867 mirror
->pg_recoalesce
= 1;
1869 nfs_pgio_data_destroy(hdr
);
1873 static enum pnfs_try_status
1874 pnfs_try_to_write_data(struct nfs_pgio_header
*hdr
,
1875 const struct rpc_call_ops
*call_ops
,
1876 struct pnfs_layout_segment
*lseg
,
1879 struct inode
*inode
= hdr
->inode
;
1880 enum pnfs_try_status trypnfs
;
1881 struct nfs_server
*nfss
= NFS_SERVER(inode
);
1883 hdr
->mds_ops
= call_ops
;
1885 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__
,
1886 inode
->i_ino
, hdr
->args
.count
, hdr
->args
.offset
, how
);
1887 trypnfs
= nfss
->pnfs_curr_ld
->write_pagelist(hdr
, how
);
1888 if (trypnfs
!= PNFS_NOT_ATTEMPTED
)
1889 nfs_inc_stats(inode
, NFSIOS_PNFS_WRITE
);
1890 dprintk("%s End (trypnfs:%d)\n", __func__
, trypnfs
);
1895 pnfs_do_write(struct nfs_pageio_descriptor
*desc
,
1896 struct nfs_pgio_header
*hdr
, int how
)
1898 const struct rpc_call_ops
*call_ops
= desc
->pg_rpc_callops
;
1899 struct pnfs_layout_segment
*lseg
= desc
->pg_lseg
;
1900 enum pnfs_try_status trypnfs
;
1902 trypnfs
= pnfs_try_to_write_data(hdr
, call_ops
, lseg
, how
);
1903 if (trypnfs
== PNFS_NOT_ATTEMPTED
)
1904 pnfs_write_through_mds(desc
, hdr
);
1907 static void pnfs_writehdr_free(struct nfs_pgio_header
*hdr
)
1909 pnfs_put_lseg(hdr
->lseg
);
1910 nfs_pgio_header_free(hdr
);
1914 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor
*desc
)
1916 struct nfs_pgio_mirror
*mirror
= nfs_pgio_current_mirror(desc
);
1918 struct nfs_pgio_header
*hdr
;
1921 hdr
= nfs_pgio_header_alloc(desc
->pg_rw_ops
);
1923 desc
->pg_completion_ops
->error_cleanup(&mirror
->pg_list
);
1926 nfs_pgheader_init(desc
, hdr
, pnfs_writehdr_free
);
1928 hdr
->lseg
= pnfs_get_lseg(desc
->pg_lseg
);
1929 ret
= nfs_generic_pgio(desc
, hdr
);
1931 pnfs_do_write(desc
, hdr
, desc
->pg_ioflags
);
1935 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages
);
1937 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header
*hdr
)
1939 struct nfs_pageio_descriptor pgio
;
1941 /* Resend all requests through the MDS */
1942 nfs_pageio_init_read(&pgio
, hdr
->inode
, true, hdr
->completion_ops
);
1943 return nfs_pageio_resend(&pgio
, hdr
);
1945 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds
);
1947 static void pnfs_ld_handle_read_error(struct nfs_pgio_header
*hdr
)
1949 dprintk("pnfs read error = %d\n", hdr
->pnfs_error
);
1950 if (NFS_SERVER(hdr
->inode
)->pnfs_curr_ld
->flags
&
1951 PNFS_LAYOUTRET_ON_ERROR
) {
1952 pnfs_return_layout(hdr
->inode
);
1954 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
))
1955 hdr
->task
.tk_status
= pnfs_read_done_resend_to_mds(hdr
);
1959 * Called by non rpc-based layout drivers
1961 void pnfs_ld_read_done(struct nfs_pgio_header
*hdr
)
1963 trace_nfs4_pnfs_read(hdr
, hdr
->pnfs_error
);
1964 if (likely(!hdr
->pnfs_error
)) {
1965 __nfs4_read_done_cb(hdr
);
1966 hdr
->mds_ops
->rpc_call_done(&hdr
->task
, hdr
);
1968 pnfs_ld_handle_read_error(hdr
);
1969 hdr
->mds_ops
->rpc_release(hdr
);
1971 EXPORT_SYMBOL_GPL(pnfs_ld_read_done
);
1974 pnfs_read_through_mds(struct nfs_pageio_descriptor
*desc
,
1975 struct nfs_pgio_header
*hdr
)
1977 struct nfs_pgio_mirror
*mirror
= nfs_pgio_current_mirror(desc
);
1979 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
1980 list_splice_tail_init(&hdr
->pages
, &mirror
->pg_list
);
1981 nfs_pageio_reset_read_mds(desc
);
1982 mirror
->pg_recoalesce
= 1;
1984 nfs_pgio_data_destroy(hdr
);
1989 * Call the appropriate parallel I/O subsystem read function.
1991 static enum pnfs_try_status
1992 pnfs_try_to_read_data(struct nfs_pgio_header
*hdr
,
1993 const struct rpc_call_ops
*call_ops
,
1994 struct pnfs_layout_segment
*lseg
)
1996 struct inode
*inode
= hdr
->inode
;
1997 struct nfs_server
*nfss
= NFS_SERVER(inode
);
1998 enum pnfs_try_status trypnfs
;
2000 hdr
->mds_ops
= call_ops
;
2002 dprintk("%s: Reading ino:%lu %u@%llu\n",
2003 __func__
, inode
->i_ino
, hdr
->args
.count
, hdr
->args
.offset
);
2005 trypnfs
= nfss
->pnfs_curr_ld
->read_pagelist(hdr
);
2006 if (trypnfs
!= PNFS_NOT_ATTEMPTED
)
2007 nfs_inc_stats(inode
, NFSIOS_PNFS_READ
);
2008 dprintk("%s End (trypnfs:%d)\n", __func__
, trypnfs
);
2012 /* Resend all requests through pnfs. */
2013 int pnfs_read_resend_pnfs(struct nfs_pgio_header
*hdr
)
2015 struct nfs_pageio_descriptor pgio
;
2017 nfs_pageio_init_read(&pgio
, hdr
->inode
, false, hdr
->completion_ops
);
2018 return nfs_pageio_resend(&pgio
, hdr
);
2020 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs
);
2023 pnfs_do_read(struct nfs_pageio_descriptor
*desc
, struct nfs_pgio_header
*hdr
)
2025 const struct rpc_call_ops
*call_ops
= desc
->pg_rpc_callops
;
2026 struct pnfs_layout_segment
*lseg
= desc
->pg_lseg
;
2027 enum pnfs_try_status trypnfs
;
2030 trypnfs
= pnfs_try_to_read_data(hdr
, call_ops
, lseg
);
2031 if (trypnfs
== PNFS_TRY_AGAIN
)
2032 err
= pnfs_read_resend_pnfs(hdr
);
2033 if (trypnfs
== PNFS_NOT_ATTEMPTED
|| err
)
2034 pnfs_read_through_mds(desc
, hdr
);
2037 static void pnfs_readhdr_free(struct nfs_pgio_header
*hdr
)
2039 pnfs_put_lseg(hdr
->lseg
);
2040 nfs_pgio_header_free(hdr
);
2044 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor
*desc
)
2046 struct nfs_pgio_mirror
*mirror
= nfs_pgio_current_mirror(desc
);
2048 struct nfs_pgio_header
*hdr
;
2051 hdr
= nfs_pgio_header_alloc(desc
->pg_rw_ops
);
2053 desc
->pg_completion_ops
->error_cleanup(&mirror
->pg_list
);
2056 nfs_pgheader_init(desc
, hdr
, pnfs_readhdr_free
);
2057 hdr
->lseg
= pnfs_get_lseg(desc
->pg_lseg
);
2058 ret
= nfs_generic_pgio(desc
, hdr
);
2060 pnfs_do_read(desc
, hdr
);
2063 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages
);
2065 static void pnfs_clear_layoutcommitting(struct inode
*inode
)
2067 unsigned long *bitlock
= &NFS_I(inode
)->flags
;
2069 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING
, bitlock
);
2070 smp_mb__after_atomic();
2071 wake_up_bit(bitlock
, NFS_INO_LAYOUTCOMMITTING
);
2075 * There can be multiple RW segments.
2077 static void pnfs_list_write_lseg(struct inode
*inode
, struct list_head
*listp
)
2079 struct pnfs_layout_segment
*lseg
;
2081 list_for_each_entry(lseg
, &NFS_I(inode
)->layout
->plh_segs
, pls_list
) {
2082 if (lseg
->pls_range
.iomode
== IOMODE_RW
&&
2083 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
))
2084 list_add(&lseg
->pls_lc_list
, listp
);
2088 static void pnfs_list_write_lseg_done(struct inode
*inode
, struct list_head
*listp
)
2090 struct pnfs_layout_segment
*lseg
, *tmp
;
2092 /* Matched by references in pnfs_set_layoutcommit */
2093 list_for_each_entry_safe(lseg
, tmp
, listp
, pls_lc_list
) {
2094 list_del_init(&lseg
->pls_lc_list
);
2095 pnfs_put_lseg(lseg
);
2098 pnfs_clear_layoutcommitting(inode
);
2101 void pnfs_set_lo_fail(struct pnfs_layout_segment
*lseg
)
2103 pnfs_layout_io_set_failed(lseg
->pls_layout
, lseg
->pls_range
.iomode
);
2105 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail
);
2108 pnfs_set_layoutcommit(struct inode
*inode
, struct pnfs_layout_segment
*lseg
,
2111 struct nfs_inode
*nfsi
= NFS_I(inode
);
2112 bool mark_as_dirty
= false;
2114 spin_lock(&inode
->i_lock
);
2115 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
)) {
2116 nfsi
->layout
->plh_lwb
= end_pos
;
2117 mark_as_dirty
= true;
2118 dprintk("%s: Set layoutcommit for inode %lu ",
2119 __func__
, inode
->i_ino
);
2120 } else if (end_pos
> nfsi
->layout
->plh_lwb
)
2121 nfsi
->layout
->plh_lwb
= end_pos
;
2122 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
)) {
2123 /* references matched in nfs4_layoutcommit_release */
2124 pnfs_get_lseg(lseg
);
2126 spin_unlock(&inode
->i_lock
);
2127 dprintk("%s: lseg %p end_pos %llu\n",
2128 __func__
, lseg
, nfsi
->layout
->plh_lwb
);
2130 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2131 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2133 mark_inode_dirty_sync(inode
);
2135 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit
);
2137 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data
*data
)
2139 struct nfs_server
*nfss
= NFS_SERVER(data
->args
.inode
);
2141 if (nfss
->pnfs_curr_ld
->cleanup_layoutcommit
)
2142 nfss
->pnfs_curr_ld
->cleanup_layoutcommit(data
);
2143 pnfs_list_write_lseg_done(data
->args
.inode
, &data
->lseg_list
);
2147 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
2148 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
2149 * data to disk to allow the server to recover the data if it crashes.
2150 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
2151 * is off, and a COMMIT is sent to a data server, or
2152 * if WRITEs to a data server return NFS_DATA_SYNC.
2155 pnfs_layoutcommit_inode(struct inode
*inode
, bool sync
)
2157 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(inode
)->pnfs_curr_ld
;
2158 struct nfs4_layoutcommit_data
*data
;
2159 struct nfs_inode
*nfsi
= NFS_I(inode
);
2163 if (!pnfs_layoutcommit_outstanding(inode
))
2166 dprintk("--> %s inode %lu\n", __func__
, inode
->i_ino
);
2169 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING
, &nfsi
->flags
)) {
2172 status
= wait_on_bit_lock_action(&nfsi
->flags
,
2173 NFS_INO_LAYOUTCOMMITTING
,
2174 nfs_wait_bit_killable
,
2181 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
2182 data
= kzalloc(sizeof(*data
), GFP_NOFS
);
2184 goto clear_layoutcommitting
;
2187 spin_lock(&inode
->i_lock
);
2188 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
))
2191 INIT_LIST_HEAD(&data
->lseg_list
);
2192 pnfs_list_write_lseg(inode
, &data
->lseg_list
);
2194 end_pos
= nfsi
->layout
->plh_lwb
;
2196 nfs4_stateid_copy(&data
->args
.stateid
, &nfsi
->layout
->plh_stateid
);
2197 spin_unlock(&inode
->i_lock
);
2199 data
->args
.inode
= inode
;
2200 data
->cred
= get_rpccred(nfsi
->layout
->plh_lc_cred
);
2201 nfs_fattr_init(&data
->fattr
);
2202 data
->args
.bitmask
= NFS_SERVER(inode
)->cache_consistency_bitmask
;
2203 data
->res
.fattr
= &data
->fattr
;
2204 data
->args
.lastbytewritten
= end_pos
- 1;
2205 data
->res
.server
= NFS_SERVER(inode
);
2207 if (ld
->prepare_layoutcommit
) {
2208 status
= ld
->prepare_layoutcommit(&data
->args
);
2210 spin_lock(&inode
->i_lock
);
2211 set_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
);
2212 if (end_pos
> nfsi
->layout
->plh_lwb
)
2213 nfsi
->layout
->plh_lwb
= end_pos
;
2214 spin_unlock(&inode
->i_lock
);
2215 put_rpccred(data
->cred
);
2216 goto clear_layoutcommitting
;
2221 status
= nfs4_proc_layoutcommit(data
, sync
);
2224 mark_inode_dirty_sync(inode
);
2225 dprintk("<-- %s status %d\n", __func__
, status
);
2228 spin_unlock(&inode
->i_lock
);
2230 clear_layoutcommitting
:
2231 pnfs_clear_layoutcommitting(inode
);
2234 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode
);
2237 pnfs_generic_sync(struct inode
*inode
, bool datasync
)
2239 return pnfs_layoutcommit_inode(inode
, true);
2241 EXPORT_SYMBOL_GPL(pnfs_generic_sync
);
2243 struct nfs4_threshold
*pnfs_mdsthreshold_alloc(void)
2245 struct nfs4_threshold
*thp
;
2247 thp
= kzalloc(sizeof(*thp
), GFP_NOFS
);
2249 dprintk("%s mdsthreshold allocation failed\n", __func__
);
2255 #if IS_ENABLED(CONFIG_NFS_V4_2)
2257 pnfs_report_layoutstat(struct inode
*inode
)
2259 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(inode
)->pnfs_curr_ld
;
2260 struct nfs_server
*server
= NFS_SERVER(inode
);
2261 struct nfs_inode
*nfsi
= NFS_I(inode
);
2262 struct nfs42_layoutstat_data
*data
;
2263 struct pnfs_layout_hdr
*hdr
;
2266 if (!pnfs_enabled_sb(server
) || !ld
->prepare_layoutstats
)
2269 if (!nfs_server_capable(inode
, NFS_CAP_LAYOUTSTATS
))
2272 if (test_and_set_bit(NFS_INO_LAYOUTSTATS
, &nfsi
->flags
))
2275 spin_lock(&inode
->i_lock
);
2276 if (!NFS_I(inode
)->layout
) {
2277 spin_unlock(&inode
->i_lock
);
2280 hdr
= NFS_I(inode
)->layout
;
2281 pnfs_get_layout_hdr(hdr
);
2282 spin_unlock(&inode
->i_lock
);
2284 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
2290 data
->args
.fh
= NFS_FH(inode
);
2291 data
->args
.inode
= inode
;
2292 nfs4_stateid_copy(&data
->args
.stateid
, &hdr
->plh_stateid
);
2293 status
= ld
->prepare_layoutstats(&data
->args
);
2297 status
= nfs42_proc_layoutstats_generic(NFS_SERVER(inode
), data
);
2300 dprintk("%s returns %d\n", __func__
, status
);
2306 pnfs_put_layout_hdr(hdr
);
2307 smp_mb__before_atomic();
2308 clear_bit(NFS_INO_LAYOUTSTATS
, &nfsi
->flags
);
2309 smp_mb__after_atomic();
2312 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat
);