4 * Write file data over NFS.
6 * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de>
9 #include <linux/types.h>
10 #include <linux/slab.h>
12 #include <linux/pagemap.h>
13 #include <linux/file.h>
14 #include <linux/writeback.h>
15 #include <linux/swap.h>
16 #include <linux/migrate.h>
18 #include <linux/sunrpc/clnt.h>
19 #include <linux/nfs_fs.h>
20 #include <linux/nfs_mount.h>
21 #include <linux/nfs_page.h>
22 #include <linux/backing-dev.h>
23 #include <linux/export.h>
25 #include <asm/uaccess.h>
27 #include "delegation.h"
36 #define NFSDBG_FACILITY NFSDBG_PAGECACHE
38 #define MIN_POOL_WRITE (32)
39 #define MIN_POOL_COMMIT (4)
42 * Local function declarations
44 static void nfs_redirty_request(struct nfs_page
*req
);
45 static const struct rpc_call_ops nfs_write_common_ops
;
46 static const struct rpc_call_ops nfs_commit_ops
;
47 static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops
;
48 static const struct nfs_commit_completion_ops nfs_commit_completion_ops
;
50 static struct kmem_cache
*nfs_wdata_cachep
;
51 static mempool_t
*nfs_wdata_mempool
;
52 static struct kmem_cache
*nfs_cdata_cachep
;
53 static mempool_t
*nfs_commit_mempool
;
55 struct nfs_commit_data
*nfs_commitdata_alloc(void)
57 struct nfs_commit_data
*p
= mempool_alloc(nfs_commit_mempool
, GFP_NOIO
);
60 memset(p
, 0, sizeof(*p
));
61 INIT_LIST_HEAD(&p
->pages
);
65 EXPORT_SYMBOL_GPL(nfs_commitdata_alloc
);
67 void nfs_commit_free(struct nfs_commit_data
*p
)
69 mempool_free(p
, nfs_commit_mempool
);
71 EXPORT_SYMBOL_GPL(nfs_commit_free
);
73 struct nfs_write_header
*nfs_writehdr_alloc(void)
75 struct nfs_write_header
*p
= mempool_alloc(nfs_wdata_mempool
, GFP_NOIO
);
78 struct nfs_pgio_header
*hdr
= &p
->header
;
80 memset(p
, 0, sizeof(*p
));
81 INIT_LIST_HEAD(&hdr
->pages
);
82 INIT_LIST_HEAD(&hdr
->rpc_list
);
83 spin_lock_init(&hdr
->lock
);
84 atomic_set(&hdr
->refcnt
, 0);
89 EXPORT_SYMBOL_GPL(nfs_writehdr_alloc
);
91 static struct nfs_write_data
*nfs_writedata_alloc(struct nfs_pgio_header
*hdr
,
92 unsigned int pagecount
)
94 struct nfs_write_data
*data
, *prealloc
;
96 prealloc
= &container_of(hdr
, struct nfs_write_header
, header
)->rpc_data
;
97 if (prealloc
->header
== NULL
)
100 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
104 if (nfs_pgarray_set(&data
->pages
, pagecount
)) {
106 atomic_inc(&hdr
->refcnt
);
108 if (data
!= prealloc
)
116 void nfs_writehdr_free(struct nfs_pgio_header
*hdr
)
118 struct nfs_write_header
*whdr
= container_of(hdr
, struct nfs_write_header
, header
);
119 mempool_free(whdr
, nfs_wdata_mempool
);
121 EXPORT_SYMBOL_GPL(nfs_writehdr_free
);
123 void nfs_writedata_release(struct nfs_write_data
*wdata
)
125 struct nfs_pgio_header
*hdr
= wdata
->header
;
126 struct nfs_write_header
*write_header
= container_of(hdr
, struct nfs_write_header
, header
);
128 put_nfs_open_context(wdata
->args
.context
);
129 if (wdata
->pages
.pagevec
!= wdata
->pages
.page_array
)
130 kfree(wdata
->pages
.pagevec
);
131 if (wdata
== &write_header
->rpc_data
) {
132 wdata
->header
= NULL
;
135 if (atomic_dec_and_test(&hdr
->refcnt
))
136 hdr
->completion_ops
->completion(hdr
);
137 /* Note: we only free the rpc_task after callbacks are done.
138 * See the comment in rpc_free_task() for why
142 EXPORT_SYMBOL_GPL(nfs_writedata_release
);
144 static void nfs_context_set_write_error(struct nfs_open_context
*ctx
, int error
)
148 set_bit(NFS_CONTEXT_ERROR_WRITE
, &ctx
->flags
);
151 static struct nfs_page
*
152 nfs_page_find_request_locked(struct nfs_inode
*nfsi
, struct page
*page
)
154 struct nfs_page
*req
= NULL
;
156 if (PagePrivate(page
))
157 req
= (struct nfs_page
*)page_private(page
);
158 else if (unlikely(PageSwapCache(page
))) {
159 struct nfs_page
*freq
, *t
;
161 /* Linearly search the commit list for the correct req */
162 list_for_each_entry_safe(freq
, t
, &nfsi
->commit_info
.list
, wb_list
) {
163 if (freq
->wb_page
== page
) {
171 kref_get(&req
->wb_kref
);
176 static struct nfs_page
*nfs_page_find_request(struct page
*page
)
178 struct inode
*inode
= page_file_mapping(page
)->host
;
179 struct nfs_page
*req
= NULL
;
181 spin_lock(&inode
->i_lock
);
182 req
= nfs_page_find_request_locked(NFS_I(inode
), page
);
183 spin_unlock(&inode
->i_lock
);
187 /* Adjust the file length if we're writing beyond the end */
188 static void nfs_grow_file(struct page
*page
, unsigned int offset
, unsigned int count
)
190 struct inode
*inode
= page_file_mapping(page
)->host
;
194 spin_lock(&inode
->i_lock
);
195 i_size
= i_size_read(inode
);
196 end_index
= (i_size
- 1) >> PAGE_CACHE_SHIFT
;
197 if (i_size
> 0 && page_file_index(page
) < end_index
)
199 end
= page_file_offset(page
) + ((loff_t
)offset
+count
);
202 i_size_write(inode
, end
);
203 nfs_inc_stats(inode
, NFSIOS_EXTENDWRITE
);
205 spin_unlock(&inode
->i_lock
);
208 /* A writeback failed: mark the page as bad, and invalidate the page cache */
209 static void nfs_set_pageerror(struct page
*page
)
211 nfs_zap_mapping(page_file_mapping(page
)->host
, page_file_mapping(page
));
214 /* We can set the PG_uptodate flag if we see that a write request
215 * covers the full page.
217 static void nfs_mark_uptodate(struct page
*page
, unsigned int base
, unsigned int count
)
219 if (PageUptodate(page
))
223 if (count
!= nfs_page_length(page
))
225 SetPageUptodate(page
);
228 static int wb_priority(struct writeback_control
*wbc
)
230 if (wbc
->for_reclaim
)
231 return FLUSH_HIGHPRI
| FLUSH_STABLE
;
232 if (wbc
->for_kupdate
|| wbc
->for_background
)
233 return FLUSH_LOWPRI
| FLUSH_COND_STABLE
;
234 return FLUSH_COND_STABLE
;
238 * NFS congestion control
241 int nfs_congestion_kb
;
243 #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10))
244 #define NFS_CONGESTION_OFF_THRESH \
245 (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2))
247 static void nfs_set_page_writeback(struct page
*page
)
249 struct nfs_server
*nfss
= NFS_SERVER(page_file_mapping(page
)->host
);
250 int ret
= test_set_page_writeback(page
);
252 WARN_ON_ONCE(ret
!= 0);
254 if (atomic_long_inc_return(&nfss
->writeback
) >
255 NFS_CONGESTION_ON_THRESH
) {
256 set_bdi_congested(&nfss
->backing_dev_info
,
261 static void nfs_end_page_writeback(struct page
*page
)
263 struct inode
*inode
= page_file_mapping(page
)->host
;
264 struct nfs_server
*nfss
= NFS_SERVER(inode
);
266 end_page_writeback(page
);
267 if (atomic_long_dec_return(&nfss
->writeback
) < NFS_CONGESTION_OFF_THRESH
)
268 clear_bdi_congested(&nfss
->backing_dev_info
, BLK_RW_ASYNC
);
271 static struct nfs_page
*nfs_find_and_lock_request(struct page
*page
, bool nonblock
)
273 struct inode
*inode
= page_file_mapping(page
)->host
;
274 struct nfs_page
*req
;
277 spin_lock(&inode
->i_lock
);
279 req
= nfs_page_find_request_locked(NFS_I(inode
), page
);
282 if (nfs_lock_request(req
))
284 /* Note: If we hold the page lock, as is the case in nfs_writepage,
285 * then the call to nfs_lock_request() will always
286 * succeed provided that someone hasn't already marked the
287 * request as dirty (in which case we don't care).
289 spin_unlock(&inode
->i_lock
);
291 ret
= nfs_wait_on_request(req
);
294 nfs_release_request(req
);
297 spin_lock(&inode
->i_lock
);
299 spin_unlock(&inode
->i_lock
);
304 * Find an associated nfs write request, and prepare to flush it out
305 * May return an error if the user signalled nfs_wait_on_request().
307 static int nfs_page_async_flush(struct nfs_pageio_descriptor
*pgio
,
308 struct page
*page
, bool nonblock
)
310 struct nfs_page
*req
;
313 req
= nfs_find_and_lock_request(page
, nonblock
);
320 nfs_set_page_writeback(page
);
321 WARN_ON_ONCE(test_bit(PG_CLEAN
, &req
->wb_flags
));
324 if (!nfs_pageio_add_request(pgio
, req
)) {
325 nfs_redirty_request(req
);
326 ret
= pgio
->pg_error
;
332 static int nfs_do_writepage(struct page
*page
, struct writeback_control
*wbc
, struct nfs_pageio_descriptor
*pgio
)
334 struct inode
*inode
= page_file_mapping(page
)->host
;
337 nfs_inc_stats(inode
, NFSIOS_VFSWRITEPAGE
);
338 nfs_add_stats(inode
, NFSIOS_WRITEPAGES
, 1);
340 nfs_pageio_cond_complete(pgio
, page_file_index(page
));
341 ret
= nfs_page_async_flush(pgio
, page
, wbc
->sync_mode
== WB_SYNC_NONE
);
342 if (ret
== -EAGAIN
) {
343 redirty_page_for_writepage(wbc
, page
);
350 * Write an mmapped page to the server.
352 static int nfs_writepage_locked(struct page
*page
, struct writeback_control
*wbc
)
354 struct nfs_pageio_descriptor pgio
;
357 NFS_PROTO(page_file_mapping(page
)->host
)->write_pageio_init(&pgio
,
360 &nfs_async_write_completion_ops
);
361 err
= nfs_do_writepage(page
, wbc
, &pgio
);
362 nfs_pageio_complete(&pgio
);
365 if (pgio
.pg_error
< 0)
366 return pgio
.pg_error
;
370 int nfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
374 ret
= nfs_writepage_locked(page
, wbc
);
379 static int nfs_writepages_callback(struct page
*page
, struct writeback_control
*wbc
, void *data
)
383 ret
= nfs_do_writepage(page
, wbc
, data
);
388 int nfs_writepages(struct address_space
*mapping
, struct writeback_control
*wbc
)
390 struct inode
*inode
= mapping
->host
;
391 unsigned long *bitlock
= &NFS_I(inode
)->flags
;
392 struct nfs_pageio_descriptor pgio
;
395 /* Stop dirtying of new pages while we sync */
396 err
= wait_on_bit_lock(bitlock
, NFS_INO_FLUSHING
,
397 nfs_wait_bit_killable
, TASK_KILLABLE
);
401 nfs_inc_stats(inode
, NFSIOS_VFSWRITEPAGES
);
403 NFS_PROTO(inode
)->write_pageio_init(&pgio
, inode
, wb_priority(wbc
), &nfs_async_write_completion_ops
);
404 err
= write_cache_pages(mapping
, wbc
, nfs_writepages_callback
, &pgio
);
405 nfs_pageio_complete(&pgio
);
407 clear_bit_unlock(NFS_INO_FLUSHING
, bitlock
);
408 smp_mb__after_atomic();
409 wake_up_bit(bitlock
, NFS_INO_FLUSHING
);
422 * Insert a write request into an inode
424 static void nfs_inode_add_request(struct inode
*inode
, struct nfs_page
*req
)
426 struct nfs_inode
*nfsi
= NFS_I(inode
);
428 /* Lock the request! */
429 nfs_lock_request(req
);
431 spin_lock(&inode
->i_lock
);
432 if (!nfsi
->npages
&& NFS_PROTO(inode
)->have_delegation(inode
, FMODE_WRITE
))
435 * Swap-space should not get truncated. Hence no need to plug the race
436 * with invalidate/truncate.
438 if (likely(!PageSwapCache(req
->wb_page
))) {
439 set_bit(PG_MAPPED
, &req
->wb_flags
);
440 SetPagePrivate(req
->wb_page
);
441 set_page_private(req
->wb_page
, (unsigned long)req
);
444 kref_get(&req
->wb_kref
);
445 spin_unlock(&inode
->i_lock
);
449 * Remove a write request from an inode
451 static void nfs_inode_remove_request(struct nfs_page
*req
)
453 struct inode
*inode
= req
->wb_context
->dentry
->d_inode
;
454 struct nfs_inode
*nfsi
= NFS_I(inode
);
456 spin_lock(&inode
->i_lock
);
457 if (likely(!PageSwapCache(req
->wb_page
))) {
458 set_page_private(req
->wb_page
, 0);
459 ClearPagePrivate(req
->wb_page
);
460 clear_bit(PG_MAPPED
, &req
->wb_flags
);
463 spin_unlock(&inode
->i_lock
);
464 nfs_release_request(req
);
468 nfs_mark_request_dirty(struct nfs_page
*req
)
470 __set_page_dirty_nobuffers(req
->wb_page
);
473 #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
475 * nfs_request_add_commit_list - add request to a commit list
476 * @req: pointer to a struct nfs_page
477 * @dst: commit list head
478 * @cinfo: holds list lock and accounting info
480 * This sets the PG_CLEAN bit, updates the cinfo count of
481 * number of outstanding requests requiring a commit as well as
484 * The caller must _not_ hold the cinfo->lock, but must be
485 * holding the nfs_page lock.
488 nfs_request_add_commit_list(struct nfs_page
*req
, struct list_head
*dst
,
489 struct nfs_commit_info
*cinfo
)
491 set_bit(PG_CLEAN
, &(req
)->wb_flags
);
492 spin_lock(cinfo
->lock
);
493 nfs_list_add_request(req
, dst
);
494 cinfo
->mds
->ncommit
++;
495 spin_unlock(cinfo
->lock
);
497 inc_zone_page_state(req
->wb_page
, NR_UNSTABLE_NFS
);
498 inc_bdi_stat(page_file_mapping(req
->wb_page
)->backing_dev_info
,
500 __mark_inode_dirty(req
->wb_context
->dentry
->d_inode
,
504 EXPORT_SYMBOL_GPL(nfs_request_add_commit_list
);
507 * nfs_request_remove_commit_list - Remove request from a commit list
508 * @req: pointer to a nfs_page
509 * @cinfo: holds list lock and accounting info
511 * This clears the PG_CLEAN bit, and updates the cinfo's count of
512 * number of outstanding requests requiring a commit
513 * It does not update the MM page stats.
515 * The caller _must_ hold the cinfo->lock and the nfs_page lock.
518 nfs_request_remove_commit_list(struct nfs_page
*req
,
519 struct nfs_commit_info
*cinfo
)
521 if (!test_and_clear_bit(PG_CLEAN
, &(req
)->wb_flags
))
523 nfs_list_remove_request(req
);
524 cinfo
->mds
->ncommit
--;
526 EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list
);
528 static void nfs_init_cinfo_from_inode(struct nfs_commit_info
*cinfo
,
531 cinfo
->lock
= &inode
->i_lock
;
532 cinfo
->mds
= &NFS_I(inode
)->commit_info
;
533 cinfo
->ds
= pnfs_get_ds_info(inode
);
535 cinfo
->completion_ops
= &nfs_commit_completion_ops
;
538 void nfs_init_cinfo(struct nfs_commit_info
*cinfo
,
540 struct nfs_direct_req
*dreq
)
543 nfs_init_cinfo_from_dreq(cinfo
, dreq
);
545 nfs_init_cinfo_from_inode(cinfo
, inode
);
547 EXPORT_SYMBOL_GPL(nfs_init_cinfo
);
550 * Add a request to the inode's commit list.
553 nfs_mark_request_commit(struct nfs_page
*req
, struct pnfs_layout_segment
*lseg
,
554 struct nfs_commit_info
*cinfo
)
556 if (pnfs_mark_request_commit(req
, lseg
, cinfo
))
558 nfs_request_add_commit_list(req
, &cinfo
->mds
->list
, cinfo
);
562 nfs_clear_page_commit(struct page
*page
)
564 dec_zone_page_state(page
, NR_UNSTABLE_NFS
);
565 dec_bdi_stat(page_file_mapping(page
)->backing_dev_info
, BDI_RECLAIMABLE
);
569 nfs_clear_request_commit(struct nfs_page
*req
)
571 if (test_bit(PG_CLEAN
, &req
->wb_flags
)) {
572 struct inode
*inode
= req
->wb_context
->dentry
->d_inode
;
573 struct nfs_commit_info cinfo
;
575 nfs_init_cinfo_from_inode(&cinfo
, inode
);
576 if (!pnfs_clear_request_commit(req
, &cinfo
)) {
577 spin_lock(cinfo
.lock
);
578 nfs_request_remove_commit_list(req
, &cinfo
);
579 spin_unlock(cinfo
.lock
);
581 nfs_clear_page_commit(req
->wb_page
);
586 int nfs_write_need_commit(struct nfs_write_data
*data
)
588 if (data
->verf
.committed
== NFS_DATA_SYNC
)
589 return data
->header
->lseg
== NULL
;
590 return data
->verf
.committed
!= NFS_FILE_SYNC
;
594 static void nfs_init_cinfo_from_inode(struct nfs_commit_info
*cinfo
,
599 void nfs_init_cinfo(struct nfs_commit_info
*cinfo
,
601 struct nfs_direct_req
*dreq
)
606 nfs_mark_request_commit(struct nfs_page
*req
, struct pnfs_layout_segment
*lseg
,
607 struct nfs_commit_info
*cinfo
)
612 nfs_clear_request_commit(struct nfs_page
*req
)
617 int nfs_write_need_commit(struct nfs_write_data
*data
)
624 static void nfs_write_completion(struct nfs_pgio_header
*hdr
)
626 struct nfs_commit_info cinfo
;
627 unsigned long bytes
= 0;
629 if (test_bit(NFS_IOHDR_REDO
, &hdr
->flags
))
631 nfs_init_cinfo_from_inode(&cinfo
, hdr
->inode
);
632 while (!list_empty(&hdr
->pages
)) {
633 struct nfs_page
*req
= nfs_list_entry(hdr
->pages
.next
);
635 bytes
+= req
->wb_bytes
;
636 nfs_list_remove_request(req
);
637 if (test_bit(NFS_IOHDR_ERROR
, &hdr
->flags
) &&
638 (hdr
->good_bytes
< bytes
)) {
639 nfs_set_pageerror(req
->wb_page
);
640 nfs_context_set_write_error(req
->wb_context
, hdr
->error
);
643 if (test_bit(NFS_IOHDR_NEED_RESCHED
, &hdr
->flags
)) {
644 nfs_mark_request_dirty(req
);
647 if (test_bit(NFS_IOHDR_NEED_COMMIT
, &hdr
->flags
)) {
648 memcpy(&req
->wb_verf
, &hdr
->verf
->verifier
, sizeof(req
->wb_verf
));
649 nfs_mark_request_commit(req
, hdr
->lseg
, &cinfo
);
653 nfs_inode_remove_request(req
);
655 nfs_unlock_request(req
);
656 nfs_end_page_writeback(req
->wb_page
);
657 nfs_release_request(req
);
663 #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
665 nfs_reqs_to_commit(struct nfs_commit_info
*cinfo
)
667 return cinfo
->mds
->ncommit
;
670 /* cinfo->lock held by caller */
672 nfs_scan_commit_list(struct list_head
*src
, struct list_head
*dst
,
673 struct nfs_commit_info
*cinfo
, int max
)
675 struct nfs_page
*req
, *tmp
;
678 list_for_each_entry_safe(req
, tmp
, src
, wb_list
) {
679 if (!nfs_lock_request(req
))
681 kref_get(&req
->wb_kref
);
682 if (cond_resched_lock(cinfo
->lock
))
683 list_safe_reset_next(req
, tmp
, wb_list
);
684 nfs_request_remove_commit_list(req
, cinfo
);
685 nfs_list_add_request(req
, dst
);
687 if ((ret
== max
) && !cinfo
->dreq
)
694 * nfs_scan_commit - Scan an inode for commit requests
695 * @inode: NFS inode to scan
696 * @dst: mds destination list
697 * @cinfo: mds and ds lists of reqs ready to commit
699 * Moves requests from the inode's 'commit' request list.
700 * The requests are *not* checked to ensure that they form a contiguous set.
703 nfs_scan_commit(struct inode
*inode
, struct list_head
*dst
,
704 struct nfs_commit_info
*cinfo
)
708 spin_lock(cinfo
->lock
);
709 if (cinfo
->mds
->ncommit
> 0) {
710 const int max
= INT_MAX
;
712 ret
= nfs_scan_commit_list(&cinfo
->mds
->list
, dst
,
714 ret
+= pnfs_scan_commit_lists(inode
, cinfo
, max
- ret
);
716 spin_unlock(cinfo
->lock
);
721 static unsigned long nfs_reqs_to_commit(struct nfs_commit_info
*cinfo
)
726 int nfs_scan_commit(struct inode
*inode
, struct list_head
*dst
,
727 struct nfs_commit_info
*cinfo
)
734 * Search for an existing write request, and attempt to update
735 * it to reflect a new dirty region on a given page.
737 * If the attempt fails, then the existing request is flushed out
740 static struct nfs_page
*nfs_try_to_update_request(struct inode
*inode
,
745 struct nfs_page
*req
;
750 if (!PagePrivate(page
))
753 end
= offset
+ bytes
;
754 spin_lock(&inode
->i_lock
);
757 req
= nfs_page_find_request_locked(NFS_I(inode
), page
);
761 rqend
= req
->wb_offset
+ req
->wb_bytes
;
763 * Tell the caller to flush out the request if
764 * the offsets are non-contiguous.
765 * Note: nfs_flush_incompatible() will already
766 * have flushed out requests having wrong owners.
769 || end
< req
->wb_offset
)
772 if (nfs_lock_request(req
))
775 /* The request is locked, so wait and then retry */
776 spin_unlock(&inode
->i_lock
);
777 error
= nfs_wait_on_request(req
);
778 nfs_release_request(req
);
781 spin_lock(&inode
->i_lock
);
784 /* Okay, the request matches. Update the region */
785 if (offset
< req
->wb_offset
) {
786 req
->wb_offset
= offset
;
787 req
->wb_pgbase
= offset
;
790 req
->wb_bytes
= end
- req
->wb_offset
;
792 req
->wb_bytes
= rqend
- req
->wb_offset
;
794 spin_unlock(&inode
->i_lock
);
796 nfs_clear_request_commit(req
);
799 spin_unlock(&inode
->i_lock
);
800 nfs_release_request(req
);
801 error
= nfs_wb_page(inode
, page
);
803 return ERR_PTR(error
);
807 * Try to update an existing write request, or create one if there is none.
809 * Note: Should always be called with the Page Lock held to prevent races
810 * if we have to add a new request. Also assumes that the caller has
811 * already called nfs_flush_incompatible() if necessary.
813 static struct nfs_page
* nfs_setup_write_request(struct nfs_open_context
* ctx
,
814 struct page
*page
, unsigned int offset
, unsigned int bytes
)
816 struct inode
*inode
= page_file_mapping(page
)->host
;
817 struct nfs_page
*req
;
819 req
= nfs_try_to_update_request(inode
, page
, offset
, bytes
);
822 req
= nfs_create_request(ctx
, inode
, page
, offset
, bytes
);
825 nfs_inode_add_request(inode
, req
);
830 static int nfs_writepage_setup(struct nfs_open_context
*ctx
, struct page
*page
,
831 unsigned int offset
, unsigned int count
)
833 struct nfs_page
*req
;
835 req
= nfs_setup_write_request(ctx
, page
, offset
, count
);
838 /* Update file length */
839 nfs_grow_file(page
, offset
, count
);
840 nfs_mark_uptodate(page
, req
->wb_pgbase
, req
->wb_bytes
);
841 nfs_mark_request_dirty(req
);
842 nfs_unlock_and_release_request(req
);
846 int nfs_flush_incompatible(struct file
*file
, struct page
*page
)
848 struct nfs_open_context
*ctx
= nfs_file_open_context(file
);
849 struct nfs_lock_context
*l_ctx
;
850 struct nfs_page
*req
;
851 int do_flush
, status
;
853 * Look for a request corresponding to this page. If there
854 * is one, and it belongs to another file, we flush it out
855 * before we try to copy anything into the page. Do this
856 * due to the lack of an ACCESS-type call in NFSv2.
857 * Also do the same if we find a request from an existing
861 req
= nfs_page_find_request(page
);
864 l_ctx
= req
->wb_lock_context
;
865 do_flush
= req
->wb_page
!= page
|| req
->wb_context
!= ctx
;
866 if (l_ctx
&& ctx
->dentry
->d_inode
->i_flock
!= NULL
) {
867 do_flush
|= l_ctx
->lockowner
.l_owner
!= current
->files
868 || l_ctx
->lockowner
.l_pid
!= current
->tgid
;
870 nfs_release_request(req
);
873 status
= nfs_wb_page(page_file_mapping(page
)->host
, page
);
874 } while (status
== 0);
879 * Avoid buffered writes when a open context credential's key would
882 * Returns -EACCES if the key will expire within RPC_KEY_EXPIRE_FAIL.
884 * Return 0 and set a credential flag which triggers the inode to flush
885 * and performs NFS_FILE_SYNC writes if the key will expired within
886 * RPC_KEY_EXPIRE_TIMEO.
889 nfs_key_timeout_notify(struct file
*filp
, struct inode
*inode
)
891 struct nfs_open_context
*ctx
= nfs_file_open_context(filp
);
892 struct rpc_auth
*auth
= NFS_SERVER(inode
)->client
->cl_auth
;
894 return rpcauth_key_timeout_notify(auth
, ctx
->cred
);
898 * Test if the open context credential key is marked to expire soon.
900 bool nfs_ctx_key_to_expire(struct nfs_open_context
*ctx
)
902 return rpcauth_cred_key_to_expire(ctx
->cred
);
906 * If the page cache is marked as unsafe or invalid, then we can't rely on
907 * the PageUptodate() flag. In this case, we will need to turn off
908 * write optimisations that depend on the page contents being correct.
910 static bool nfs_write_pageuptodate(struct page
*page
, struct inode
*inode
)
912 struct nfs_inode
*nfsi
= NFS_I(inode
);
914 if (nfs_have_delegated_attributes(inode
))
916 if (nfsi
->cache_validity
& (NFS_INO_INVALID_DATA
|NFS_INO_REVAL_PAGECACHE
))
919 if (test_bit(NFS_INO_INVALIDATING
, &nfsi
->flags
))
922 return PageUptodate(page
) != 0;
925 /* If we know the page is up to date, and we're not using byte range locks (or
926 * if we have the whole file locked for writing), it may be more efficient to
927 * extend the write to cover the entire page in order to avoid fragmentation
930 * If the file is opened for synchronous writes then we can just skip the rest
933 static int nfs_can_extend_write(struct file
*file
, struct page
*page
, struct inode
*inode
)
935 if (file
->f_flags
& O_DSYNC
)
937 if (!nfs_write_pageuptodate(page
, inode
))
939 if (NFS_PROTO(inode
)->have_delegation(inode
, FMODE_WRITE
))
941 if (inode
->i_flock
== NULL
|| (inode
->i_flock
->fl_start
== 0 &&
942 inode
->i_flock
->fl_end
== OFFSET_MAX
&&
943 inode
->i_flock
->fl_type
!= F_RDLCK
))
949 * Update and possibly write a cached page of an NFS file.
951 * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad
952 * things with a page scheduled for an RPC call (e.g. invalidate it).
954 int nfs_updatepage(struct file
*file
, struct page
*page
,
955 unsigned int offset
, unsigned int count
)
957 struct nfs_open_context
*ctx
= nfs_file_open_context(file
);
958 struct inode
*inode
= page_file_mapping(page
)->host
;
961 nfs_inc_stats(inode
, NFSIOS_VFSUPDATEPAGE
);
963 dprintk("NFS: nfs_updatepage(%pD2 %d@%lld)\n",
964 file
, count
, (long long)(page_file_offset(page
) + offset
));
966 if (nfs_can_extend_write(file
, page
, inode
)) {
967 count
= max(count
+ offset
, nfs_page_length(page
));
971 status
= nfs_writepage_setup(ctx
, page
, offset
, count
);
973 nfs_set_pageerror(page
);
975 __set_page_dirty_nobuffers(page
);
977 dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n",
978 status
, (long long)i_size_read(inode
));
982 static int flush_task_priority(int how
)
984 switch (how
& (FLUSH_HIGHPRI
|FLUSH_LOWPRI
)) {
986 return RPC_PRIORITY_HIGH
;
988 return RPC_PRIORITY_LOW
;
990 return RPC_PRIORITY_NORMAL
;
993 int nfs_initiate_write(struct rpc_clnt
*clnt
,
994 struct nfs_write_data
*data
,
995 const struct rpc_call_ops
*call_ops
,
998 struct inode
*inode
= data
->header
->inode
;
999 int priority
= flush_task_priority(how
);
1000 struct rpc_task
*task
;
1001 struct rpc_message msg
= {
1002 .rpc_argp
= &data
->args
,
1003 .rpc_resp
= &data
->res
,
1004 .rpc_cred
= data
->header
->cred
,
1006 struct rpc_task_setup task_setup_data
= {
1008 .task
= &data
->task
,
1009 .rpc_message
= &msg
,
1010 .callback_ops
= call_ops
,
1011 .callback_data
= data
,
1012 .workqueue
= nfsiod_workqueue
,
1013 .flags
= RPC_TASK_ASYNC
| flags
,
1014 .priority
= priority
,
1018 /* Set up the initial task struct. */
1019 NFS_PROTO(inode
)->write_setup(data
, &msg
);
1021 dprintk("NFS: %5u initiated write call "
1022 "(req %s/%llu, %u bytes @ offset %llu)\n",
1025 (unsigned long long)NFS_FILEID(inode
),
1027 (unsigned long long)data
->args
.offset
);
1029 nfs4_state_protect_write(NFS_SERVER(inode
)->nfs_client
,
1030 &task_setup_data
.rpc_client
, &msg
, data
);
1032 task
= rpc_run_task(&task_setup_data
);
1034 ret
= PTR_ERR(task
);
1037 if (how
& FLUSH_SYNC
) {
1038 ret
= rpc_wait_for_completion_task(task
);
1040 ret
= task
->tk_status
;
1046 EXPORT_SYMBOL_GPL(nfs_initiate_write
);
1049 * Set up the argument/result storage required for the RPC call.
1051 static void nfs_write_rpcsetup(struct nfs_write_data
*data
,
1052 unsigned int count
, unsigned int offset
,
1053 int how
, struct nfs_commit_info
*cinfo
)
1055 struct nfs_page
*req
= data
->header
->req
;
1057 /* Set up the RPC argument and reply structs
1058 * NB: take care not to mess about with data->commit et al. */
1060 data
->args
.fh
= NFS_FH(data
->header
->inode
);
1061 data
->args
.offset
= req_offset(req
) + offset
;
1062 /* pnfs_set_layoutcommit needs this */
1063 data
->mds_offset
= data
->args
.offset
;
1064 data
->args
.pgbase
= req
->wb_pgbase
+ offset
;
1065 data
->args
.pages
= data
->pages
.pagevec
;
1066 data
->args
.count
= count
;
1067 data
->args
.context
= get_nfs_open_context(req
->wb_context
);
1068 data
->args
.lock_context
= req
->wb_lock_context
;
1069 data
->args
.stable
= NFS_UNSTABLE
;
1070 switch (how
& (FLUSH_STABLE
| FLUSH_COND_STABLE
)) {
1073 case FLUSH_COND_STABLE
:
1074 if (nfs_reqs_to_commit(cinfo
))
1077 data
->args
.stable
= NFS_FILE_SYNC
;
1080 data
->res
.fattr
= &data
->fattr
;
1081 data
->res
.count
= count
;
1082 data
->res
.verf
= &data
->verf
;
1083 nfs_fattr_init(&data
->fattr
);
1086 static int nfs_do_write(struct nfs_write_data
*data
,
1087 const struct rpc_call_ops
*call_ops
,
1090 struct inode
*inode
= data
->header
->inode
;
1092 return nfs_initiate_write(NFS_CLIENT(inode
), data
, call_ops
, how
, 0);
1095 static int nfs_do_multiple_writes(struct list_head
*head
,
1096 const struct rpc_call_ops
*call_ops
,
1099 struct nfs_write_data
*data
;
1102 while (!list_empty(head
)) {
1105 data
= list_first_entry(head
, struct nfs_write_data
, list
);
1106 list_del_init(&data
->list
);
1108 ret2
= nfs_do_write(data
, call_ops
, how
);
1115 /* If a nfs_flush_* function fails, it should remove reqs from @head and
1116 * call this on each, which will prepare them to be retried on next
1117 * writeback using standard nfs.
1119 static void nfs_redirty_request(struct nfs_page
*req
)
1121 nfs_mark_request_dirty(req
);
1122 nfs_unlock_request(req
);
1123 nfs_end_page_writeback(req
->wb_page
);
1124 nfs_release_request(req
);
1127 static void nfs_async_write_error(struct list_head
*head
)
1129 struct nfs_page
*req
;
1131 while (!list_empty(head
)) {
1132 req
= nfs_list_entry(head
->next
);
1133 nfs_list_remove_request(req
);
1134 nfs_redirty_request(req
);
1138 static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops
= {
1139 .error_cleanup
= nfs_async_write_error
,
1140 .completion
= nfs_write_completion
,
1143 static void nfs_flush_error(struct nfs_pageio_descriptor
*desc
,
1144 struct nfs_pgio_header
*hdr
)
1146 set_bit(NFS_IOHDR_REDO
, &hdr
->flags
);
1147 while (!list_empty(&hdr
->rpc_list
)) {
1148 struct nfs_write_data
*data
= list_first_entry(&hdr
->rpc_list
,
1149 struct nfs_write_data
, list
);
1150 list_del(&data
->list
);
1151 nfs_writedata_release(data
);
1153 desc
->pg_completion_ops
->error_cleanup(&desc
->pg_list
);
1157 * Generate multiple small requests to write out a single
1158 * contiguous dirty area on one page.
1160 static int nfs_flush_multi(struct nfs_pageio_descriptor
*desc
,
1161 struct nfs_pgio_header
*hdr
)
1163 struct nfs_page
*req
= hdr
->req
;
1164 struct page
*page
= req
->wb_page
;
1165 struct nfs_write_data
*data
;
1166 size_t wsize
= desc
->pg_bsize
, nbytes
;
1167 unsigned int offset
;
1169 struct nfs_commit_info cinfo
;
1171 nfs_init_cinfo(&cinfo
, desc
->pg_inode
, desc
->pg_dreq
);
1173 if ((desc
->pg_ioflags
& FLUSH_COND_STABLE
) &&
1174 (desc
->pg_moreio
|| nfs_reqs_to_commit(&cinfo
) ||
1175 desc
->pg_count
> wsize
))
1176 desc
->pg_ioflags
&= ~FLUSH_COND_STABLE
;
1180 nbytes
= desc
->pg_count
;
1182 size_t len
= min(nbytes
, wsize
);
1184 data
= nfs_writedata_alloc(hdr
, 1);
1186 nfs_flush_error(desc
, hdr
);
1189 data
->pages
.pagevec
[0] = page
;
1190 nfs_write_rpcsetup(data
, len
, offset
, desc
->pg_ioflags
, &cinfo
);
1191 list_add(&data
->list
, &hdr
->rpc_list
);
1195 } while (nbytes
!= 0);
1196 nfs_list_remove_request(req
);
1197 nfs_list_add_request(req
, &hdr
->pages
);
1198 desc
->pg_rpc_callops
= &nfs_write_common_ops
;
1203 * Create an RPC task for the given write request and kick it.
1204 * The page must have been locked by the caller.
1206 * It may happen that the page we're passed is not marked dirty.
1207 * This is the case if nfs_updatepage detects a conflicting request
1208 * that has been written but not committed.
1210 static int nfs_flush_one(struct nfs_pageio_descriptor
*desc
,
1211 struct nfs_pgio_header
*hdr
)
1213 struct nfs_page
*req
;
1214 struct page
**pages
;
1215 struct nfs_write_data
*data
;
1216 struct list_head
*head
= &desc
->pg_list
;
1217 struct nfs_commit_info cinfo
;
1219 data
= nfs_writedata_alloc(hdr
, nfs_page_array_len(desc
->pg_base
,
1222 nfs_flush_error(desc
, hdr
);
1226 nfs_init_cinfo(&cinfo
, desc
->pg_inode
, desc
->pg_dreq
);
1227 pages
= data
->pages
.pagevec
;
1228 while (!list_empty(head
)) {
1229 req
= nfs_list_entry(head
->next
);
1230 nfs_list_remove_request(req
);
1231 nfs_list_add_request(req
, &hdr
->pages
);
1232 *pages
++ = req
->wb_page
;
1235 if ((desc
->pg_ioflags
& FLUSH_COND_STABLE
) &&
1236 (desc
->pg_moreio
|| nfs_reqs_to_commit(&cinfo
)))
1237 desc
->pg_ioflags
&= ~FLUSH_COND_STABLE
;
1239 /* Set up the argument struct */
1240 nfs_write_rpcsetup(data
, desc
->pg_count
, 0, desc
->pg_ioflags
, &cinfo
);
1241 list_add(&data
->list
, &hdr
->rpc_list
);
1242 desc
->pg_rpc_callops
= &nfs_write_common_ops
;
1246 int nfs_generic_flush(struct nfs_pageio_descriptor
*desc
,
1247 struct nfs_pgio_header
*hdr
)
1249 if (desc
->pg_bsize
< PAGE_CACHE_SIZE
)
1250 return nfs_flush_multi(desc
, hdr
);
1251 return nfs_flush_one(desc
, hdr
);
1253 EXPORT_SYMBOL_GPL(nfs_generic_flush
);
1255 static int nfs_generic_pg_writepages(struct nfs_pageio_descriptor
*desc
)
1257 struct nfs_write_header
*whdr
;
1258 struct nfs_pgio_header
*hdr
;
1261 whdr
= nfs_writehdr_alloc();
1263 desc
->pg_completion_ops
->error_cleanup(&desc
->pg_list
);
1266 hdr
= &whdr
->header
;
1267 nfs_pgheader_init(desc
, hdr
, nfs_writehdr_free
);
1268 atomic_inc(&hdr
->refcnt
);
1269 ret
= nfs_generic_flush(desc
, hdr
);
1271 ret
= nfs_do_multiple_writes(&hdr
->rpc_list
,
1272 desc
->pg_rpc_callops
,
1274 if (atomic_dec_and_test(&hdr
->refcnt
))
1275 hdr
->completion_ops
->completion(hdr
);
1279 static const struct nfs_pageio_ops nfs_pageio_write_ops
= {
1280 .pg_test
= nfs_generic_pg_test
,
1281 .pg_doio
= nfs_generic_pg_writepages
,
1284 void nfs_pageio_init_write(struct nfs_pageio_descriptor
*pgio
,
1285 struct inode
*inode
, int ioflags
,
1286 const struct nfs_pgio_completion_ops
*compl_ops
)
1288 nfs_pageio_init(pgio
, inode
, &nfs_pageio_write_ops
, compl_ops
,
1289 NFS_SERVER(inode
)->wsize
, ioflags
);
1291 EXPORT_SYMBOL_GPL(nfs_pageio_init_write
);
1293 void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor
*pgio
)
1295 pgio
->pg_ops
= &nfs_pageio_write_ops
;
1296 pgio
->pg_bsize
= NFS_SERVER(pgio
->pg_inode
)->wsize
;
1298 EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds
);
1301 void nfs_write_prepare(struct rpc_task
*task
, void *calldata
)
1303 struct nfs_write_data
*data
= calldata
;
1305 err
= NFS_PROTO(data
->header
->inode
)->write_rpc_prepare(task
, data
);
1307 rpc_exit(task
, err
);
1310 void nfs_commit_prepare(struct rpc_task
*task
, void *calldata
)
1312 struct nfs_commit_data
*data
= calldata
;
1314 NFS_PROTO(data
->inode
)->commit_rpc_prepare(task
, data
);
1318 * Handle a write reply that flushes a whole page.
1320 * FIXME: There is an inherent race with invalidate_inode_pages and
1321 * writebacks since the page->count is kept > 1 for as long
1322 * as the page has a write request pending.
1324 static void nfs_writeback_done_common(struct rpc_task
*task
, void *calldata
)
1326 struct nfs_write_data
*data
= calldata
;
1328 nfs_writeback_done(task
, data
);
1331 static void nfs_writeback_release_common(void *calldata
)
1333 struct nfs_write_data
*data
= calldata
;
1334 struct nfs_pgio_header
*hdr
= data
->header
;
1335 int status
= data
->task
.tk_status
;
1337 if ((status
>= 0) && nfs_write_need_commit(data
)) {
1338 spin_lock(&hdr
->lock
);
1339 if (test_bit(NFS_IOHDR_NEED_RESCHED
, &hdr
->flags
))
1341 else if (!test_and_set_bit(NFS_IOHDR_NEED_COMMIT
, &hdr
->flags
))
1342 memcpy(hdr
->verf
, &data
->verf
, sizeof(*hdr
->verf
));
1343 else if (memcmp(hdr
->verf
, &data
->verf
, sizeof(*hdr
->verf
)))
1344 set_bit(NFS_IOHDR_NEED_RESCHED
, &hdr
->flags
);
1345 spin_unlock(&hdr
->lock
);
1347 nfs_writedata_release(data
);
1350 static const struct rpc_call_ops nfs_write_common_ops
= {
1351 .rpc_call_prepare
= nfs_write_prepare
,
1352 .rpc_call_done
= nfs_writeback_done_common
,
1353 .rpc_release
= nfs_writeback_release_common
,
1358 * This function is called when the WRITE call is complete.
1360 void nfs_writeback_done(struct rpc_task
*task
, struct nfs_write_data
*data
)
1362 struct nfs_writeargs
*argp
= &data
->args
;
1363 struct nfs_writeres
*resp
= &data
->res
;
1364 struct inode
*inode
= data
->header
->inode
;
1367 dprintk("NFS: %5u nfs_writeback_done (status %d)\n",
1368 task
->tk_pid
, task
->tk_status
);
1371 * ->write_done will attempt to use post-op attributes to detect
1372 * conflicting writes by other clients. A strict interpretation
1373 * of close-to-open would allow us to continue caching even if
1374 * another writer had changed the file, but some applications
1375 * depend on tighter cache coherency when writing.
1377 status
= NFS_PROTO(inode
)->write_done(task
, data
);
1380 nfs_add_stats(inode
, NFSIOS_SERVERWRITTENBYTES
, resp
->count
);
1382 #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
1383 if (resp
->verf
->committed
< argp
->stable
&& task
->tk_status
>= 0) {
1384 /* We tried a write call, but the server did not
1385 * commit data to stable storage even though we
1387 * Note: There is a known bug in Tru64 < 5.0 in which
1388 * the server reports NFS_DATA_SYNC, but performs
1389 * NFS_FILE_SYNC. We therefore implement this checking
1390 * as a dprintk() in order to avoid filling syslog.
1392 static unsigned long complain
;
1394 /* Note this will print the MDS for a DS write */
1395 if (time_before(complain
, jiffies
)) {
1396 dprintk("NFS: faulty NFS server %s:"
1397 " (committed = %d) != (stable = %d)\n",
1398 NFS_SERVER(inode
)->nfs_client
->cl_hostname
,
1399 resp
->verf
->committed
, argp
->stable
);
1400 complain
= jiffies
+ 300 * HZ
;
1404 if (task
->tk_status
< 0)
1405 nfs_set_pgio_error(data
->header
, task
->tk_status
, argp
->offset
);
1406 else if (resp
->count
< argp
->count
) {
1407 static unsigned long complain
;
1409 /* This a short write! */
1410 nfs_inc_stats(inode
, NFSIOS_SHORTWRITE
);
1412 /* Has the server at least made some progress? */
1413 if (resp
->count
== 0) {
1414 if (time_before(complain
, jiffies
)) {
1416 "NFS: Server wrote zero bytes, expected %u.\n",
1418 complain
= jiffies
+ 300 * HZ
;
1420 nfs_set_pgio_error(data
->header
, -EIO
, argp
->offset
);
1421 task
->tk_status
= -EIO
;
1424 /* Was this an NFSv2 write or an NFSv3 stable write? */
1425 if (resp
->verf
->committed
!= NFS_UNSTABLE
) {
1426 /* Resend from where the server left off */
1427 data
->mds_offset
+= resp
->count
;
1428 argp
->offset
+= resp
->count
;
1429 argp
->pgbase
+= resp
->count
;
1430 argp
->count
-= resp
->count
;
1432 /* Resend as a stable write in order to avoid
1433 * headaches in the case of a server crash.
1435 argp
->stable
= NFS_FILE_SYNC
;
1437 rpc_restart_call_prepare(task
);
1442 #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
1443 static int nfs_commit_set_lock(struct nfs_inode
*nfsi
, int may_wait
)
1447 if (!test_and_set_bit(NFS_INO_COMMIT
, &nfsi
->flags
))
1451 ret
= out_of_line_wait_on_bit_lock(&nfsi
->flags
,
1453 nfs_wait_bit_killable
,
1455 return (ret
< 0) ? ret
: 1;
1458 static void nfs_commit_clear_lock(struct nfs_inode
*nfsi
)
1460 clear_bit(NFS_INO_COMMIT
, &nfsi
->flags
);
1461 smp_mb__after_atomic();
1462 wake_up_bit(&nfsi
->flags
, NFS_INO_COMMIT
);
1465 void nfs_commitdata_release(struct nfs_commit_data
*data
)
1467 put_nfs_open_context(data
->context
);
1468 nfs_commit_free(data
);
1470 EXPORT_SYMBOL_GPL(nfs_commitdata_release
);
1472 int nfs_initiate_commit(struct rpc_clnt
*clnt
, struct nfs_commit_data
*data
,
1473 const struct rpc_call_ops
*call_ops
,
1476 struct rpc_task
*task
;
1477 int priority
= flush_task_priority(how
);
1478 struct rpc_message msg
= {
1479 .rpc_argp
= &data
->args
,
1480 .rpc_resp
= &data
->res
,
1481 .rpc_cred
= data
->cred
,
1483 struct rpc_task_setup task_setup_data
= {
1484 .task
= &data
->task
,
1486 .rpc_message
= &msg
,
1487 .callback_ops
= call_ops
,
1488 .callback_data
= data
,
1489 .workqueue
= nfsiod_workqueue
,
1490 .flags
= RPC_TASK_ASYNC
| flags
,
1491 .priority
= priority
,
1493 /* Set up the initial task struct. */
1494 NFS_PROTO(data
->inode
)->commit_setup(data
, &msg
);
1496 dprintk("NFS: %5u initiated commit call\n", data
->task
.tk_pid
);
1498 nfs4_state_protect(NFS_SERVER(data
->inode
)->nfs_client
,
1499 NFS_SP4_MACH_CRED_COMMIT
, &task_setup_data
.rpc_client
, &msg
);
1501 task
= rpc_run_task(&task_setup_data
);
1503 return PTR_ERR(task
);
1504 if (how
& FLUSH_SYNC
)
1505 rpc_wait_for_completion_task(task
);
1509 EXPORT_SYMBOL_GPL(nfs_initiate_commit
);
1512 * Set up the argument/result storage required for the RPC call.
1514 void nfs_init_commit(struct nfs_commit_data
*data
,
1515 struct list_head
*head
,
1516 struct pnfs_layout_segment
*lseg
,
1517 struct nfs_commit_info
*cinfo
)
1519 struct nfs_page
*first
= nfs_list_entry(head
->next
);
1520 struct inode
*inode
= first
->wb_context
->dentry
->d_inode
;
1522 /* Set up the RPC argument and reply structs
1523 * NB: take care not to mess about with data->commit et al. */
1525 list_splice_init(head
, &data
->pages
);
1527 data
->inode
= inode
;
1528 data
->cred
= first
->wb_context
->cred
;
1529 data
->lseg
= lseg
; /* reference transferred */
1530 data
->mds_ops
= &nfs_commit_ops
;
1531 data
->completion_ops
= cinfo
->completion_ops
;
1532 data
->dreq
= cinfo
->dreq
;
1534 data
->args
.fh
= NFS_FH(data
->inode
);
1535 /* Note: we always request a commit of the entire inode */
1536 data
->args
.offset
= 0;
1537 data
->args
.count
= 0;
1538 data
->context
= get_nfs_open_context(first
->wb_context
);
1539 data
->res
.fattr
= &data
->fattr
;
1540 data
->res
.verf
= &data
->verf
;
1541 nfs_fattr_init(&data
->fattr
);
1543 EXPORT_SYMBOL_GPL(nfs_init_commit
);
1545 void nfs_retry_commit(struct list_head
*page_list
,
1546 struct pnfs_layout_segment
*lseg
,
1547 struct nfs_commit_info
*cinfo
)
1549 struct nfs_page
*req
;
1551 while (!list_empty(page_list
)) {
1552 req
= nfs_list_entry(page_list
->next
);
1553 nfs_list_remove_request(req
);
1554 nfs_mark_request_commit(req
, lseg
, cinfo
);
1556 dec_zone_page_state(req
->wb_page
, NR_UNSTABLE_NFS
);
1557 dec_bdi_stat(page_file_mapping(req
->wb_page
)->backing_dev_info
,
1560 nfs_unlock_and_release_request(req
);
1563 EXPORT_SYMBOL_GPL(nfs_retry_commit
);
1566 * Commit dirty pages
1569 nfs_commit_list(struct inode
*inode
, struct list_head
*head
, int how
,
1570 struct nfs_commit_info
*cinfo
)
1572 struct nfs_commit_data
*data
;
1574 data
= nfs_commitdata_alloc();
1579 /* Set up the argument struct */
1580 nfs_init_commit(data
, head
, NULL
, cinfo
);
1581 atomic_inc(&cinfo
->mds
->rpcs_out
);
1582 return nfs_initiate_commit(NFS_CLIENT(inode
), data
, data
->mds_ops
,
1585 nfs_retry_commit(head
, NULL
, cinfo
);
1586 cinfo
->completion_ops
->error_cleanup(NFS_I(inode
));
1591 * COMMIT call returned
1593 static void nfs_commit_done(struct rpc_task
*task
, void *calldata
)
1595 struct nfs_commit_data
*data
= calldata
;
1597 dprintk("NFS: %5u nfs_commit_done (status %d)\n",
1598 task
->tk_pid
, task
->tk_status
);
1600 /* Call the NFS version-specific code */
1601 NFS_PROTO(data
->inode
)->commit_done(task
, data
);
1604 static void nfs_commit_release_pages(struct nfs_commit_data
*data
)
1606 struct nfs_page
*req
;
1607 int status
= data
->task
.tk_status
;
1608 struct nfs_commit_info cinfo
;
1610 while (!list_empty(&data
->pages
)) {
1611 req
= nfs_list_entry(data
->pages
.next
);
1612 nfs_list_remove_request(req
);
1613 nfs_clear_page_commit(req
->wb_page
);
1615 dprintk("NFS: commit (%s/%llu %d@%lld)",
1616 req
->wb_context
->dentry
->d_sb
->s_id
,
1617 (unsigned long long)NFS_FILEID(req
->wb_context
->dentry
->d_inode
),
1619 (long long)req_offset(req
));
1621 nfs_context_set_write_error(req
->wb_context
, status
);
1622 nfs_inode_remove_request(req
);
1623 dprintk(", error = %d\n", status
);
1627 /* Okay, COMMIT succeeded, apparently. Check the verifier
1628 * returned by the server against all stored verfs. */
1629 if (!memcmp(&req
->wb_verf
, &data
->verf
.verifier
, sizeof(req
->wb_verf
))) {
1630 /* We have a match */
1631 nfs_inode_remove_request(req
);
1635 /* We have a mismatch. Write the page again */
1636 dprintk(" mismatch\n");
1637 nfs_mark_request_dirty(req
);
1638 set_bit(NFS_CONTEXT_RESEND_WRITES
, &req
->wb_context
->flags
);
1640 nfs_unlock_and_release_request(req
);
1642 nfs_init_cinfo(&cinfo
, data
->inode
, data
->dreq
);
1643 if (atomic_dec_and_test(&cinfo
.mds
->rpcs_out
))
1644 nfs_commit_clear_lock(NFS_I(data
->inode
));
1647 static void nfs_commit_release(void *calldata
)
1649 struct nfs_commit_data
*data
= calldata
;
1651 data
->completion_ops
->completion(data
);
1652 nfs_commitdata_release(calldata
);
1655 static const struct rpc_call_ops nfs_commit_ops
= {
1656 .rpc_call_prepare
= nfs_commit_prepare
,
1657 .rpc_call_done
= nfs_commit_done
,
1658 .rpc_release
= nfs_commit_release
,
1661 static const struct nfs_commit_completion_ops nfs_commit_completion_ops
= {
1662 .completion
= nfs_commit_release_pages
,
1663 .error_cleanup
= nfs_commit_clear_lock
,
1666 int nfs_generic_commit_list(struct inode
*inode
, struct list_head
*head
,
1667 int how
, struct nfs_commit_info
*cinfo
)
1671 status
= pnfs_commit_list(inode
, head
, how
, cinfo
);
1672 if (status
== PNFS_NOT_ATTEMPTED
)
1673 status
= nfs_commit_list(inode
, head
, how
, cinfo
);
1677 int nfs_commit_inode(struct inode
*inode
, int how
)
1680 struct nfs_commit_info cinfo
;
1681 int may_wait
= how
& FLUSH_SYNC
;
1684 res
= nfs_commit_set_lock(NFS_I(inode
), may_wait
);
1686 goto out_mark_dirty
;
1687 nfs_init_cinfo_from_inode(&cinfo
, inode
);
1688 res
= nfs_scan_commit(inode
, &head
, &cinfo
);
1692 error
= nfs_generic_commit_list(inode
, &head
, how
, &cinfo
);
1696 goto out_mark_dirty
;
1697 error
= wait_on_bit(&NFS_I(inode
)->flags
,
1699 nfs_wait_bit_killable
,
1704 nfs_commit_clear_lock(NFS_I(inode
));
1706 /* Note: If we exit without ensuring that the commit is complete,
1707 * we must mark the inode as dirty. Otherwise, future calls to
1708 * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure
1709 * that the data is on the disk.
1712 __mark_inode_dirty(inode
, I_DIRTY_DATASYNC
);
1716 static int nfs_commit_unstable_pages(struct inode
*inode
, struct writeback_control
*wbc
)
1718 struct nfs_inode
*nfsi
= NFS_I(inode
);
1719 int flags
= FLUSH_SYNC
;
1722 /* no commits means nothing needs to be done */
1723 if (!nfsi
->commit_info
.ncommit
)
1726 if (wbc
->sync_mode
== WB_SYNC_NONE
) {
1727 /* Don't commit yet if this is a non-blocking flush and there
1728 * are a lot of outstanding writes for this mapping.
1730 if (nfsi
->commit_info
.ncommit
<= (nfsi
->npages
>> 1))
1731 goto out_mark_dirty
;
1733 /* don't wait for the COMMIT response */
1737 ret
= nfs_commit_inode(inode
, flags
);
1739 if (wbc
->sync_mode
== WB_SYNC_NONE
) {
1740 if (ret
< wbc
->nr_to_write
)
1741 wbc
->nr_to_write
-= ret
;
1743 wbc
->nr_to_write
= 0;
1748 __mark_inode_dirty(inode
, I_DIRTY_DATASYNC
);
1752 static int nfs_commit_unstable_pages(struct inode
*inode
, struct writeback_control
*wbc
)
1758 int nfs_write_inode(struct inode
*inode
, struct writeback_control
*wbc
)
1760 return nfs_commit_unstable_pages(inode
, wbc
);
1762 EXPORT_SYMBOL_GPL(nfs_write_inode
);
1765 * flush the inode to disk.
1767 int nfs_wb_all(struct inode
*inode
)
1769 struct writeback_control wbc
= {
1770 .sync_mode
= WB_SYNC_ALL
,
1771 .nr_to_write
= LONG_MAX
,
1773 .range_end
= LLONG_MAX
,
1777 trace_nfs_writeback_inode_enter(inode
);
1779 ret
= sync_inode(inode
, &wbc
);
1781 trace_nfs_writeback_inode_exit(inode
, ret
);
1784 EXPORT_SYMBOL_GPL(nfs_wb_all
);
1786 int nfs_wb_page_cancel(struct inode
*inode
, struct page
*page
)
1788 struct nfs_page
*req
;
1792 wait_on_page_writeback(page
);
1793 req
= nfs_page_find_request(page
);
1796 if (nfs_lock_request(req
)) {
1797 nfs_clear_request_commit(req
);
1798 nfs_inode_remove_request(req
);
1800 * In case nfs_inode_remove_request has marked the
1801 * page as being dirty
1803 cancel_dirty_page(page
, PAGE_CACHE_SIZE
);
1804 nfs_unlock_and_release_request(req
);
1807 ret
= nfs_wait_on_request(req
);
1808 nfs_release_request(req
);
1816 * Write back all requests on one page - we do this before reading it.
1818 int nfs_wb_page(struct inode
*inode
, struct page
*page
)
1820 loff_t range_start
= page_file_offset(page
);
1821 loff_t range_end
= range_start
+ (loff_t
)(PAGE_CACHE_SIZE
- 1);
1822 struct writeback_control wbc
= {
1823 .sync_mode
= WB_SYNC_ALL
,
1825 .range_start
= range_start
,
1826 .range_end
= range_end
,
1830 trace_nfs_writeback_page_enter(inode
);
1833 wait_on_page_writeback(page
);
1834 if (clear_page_dirty_for_io(page
)) {
1835 ret
= nfs_writepage_locked(page
, &wbc
);
1841 if (!PagePrivate(page
))
1843 ret
= nfs_commit_inode(inode
, FLUSH_SYNC
);
1848 trace_nfs_writeback_page_exit(inode
, ret
);
1852 #ifdef CONFIG_MIGRATION
1853 int nfs_migrate_page(struct address_space
*mapping
, struct page
*newpage
,
1854 struct page
*page
, enum migrate_mode mode
)
1857 * If PagePrivate is set, then the page is currently associated with
1858 * an in-progress read or write request. Don't try to migrate it.
1860 * FIXME: we could do this in principle, but we'll need a way to ensure
1861 * that we can safely release the inode reference while holding
1864 if (PagePrivate(page
))
1867 if (!nfs_fscache_release_page(page
, GFP_KERNEL
))
1870 return migrate_page(mapping
, newpage
, page
, mode
);
1874 int __init
nfs_init_writepagecache(void)
1876 nfs_wdata_cachep
= kmem_cache_create("nfs_write_data",
1877 sizeof(struct nfs_write_header
),
1878 0, SLAB_HWCACHE_ALIGN
,
1880 if (nfs_wdata_cachep
== NULL
)
1883 nfs_wdata_mempool
= mempool_create_slab_pool(MIN_POOL_WRITE
,
1885 if (nfs_wdata_mempool
== NULL
)
1886 goto out_destroy_write_cache
;
1888 nfs_cdata_cachep
= kmem_cache_create("nfs_commit_data",
1889 sizeof(struct nfs_commit_data
),
1890 0, SLAB_HWCACHE_ALIGN
,
1892 if (nfs_cdata_cachep
== NULL
)
1893 goto out_destroy_write_mempool
;
1895 nfs_commit_mempool
= mempool_create_slab_pool(MIN_POOL_COMMIT
,
1897 if (nfs_commit_mempool
== NULL
)
1898 goto out_destroy_commit_cache
;
1901 * NFS congestion size, scale with available memory.
1913 * This allows larger machines to have larger/more transfers.
1914 * Limit the default to 256M
1916 nfs_congestion_kb
= (16*int_sqrt(totalram_pages
)) << (PAGE_SHIFT
-10);
1917 if (nfs_congestion_kb
> 256*1024)
1918 nfs_congestion_kb
= 256*1024;
1922 out_destroy_commit_cache
:
1923 kmem_cache_destroy(nfs_cdata_cachep
);
1924 out_destroy_write_mempool
:
1925 mempool_destroy(nfs_wdata_mempool
);
1926 out_destroy_write_cache
:
1927 kmem_cache_destroy(nfs_wdata_cachep
);
1931 void nfs_destroy_writepagecache(void)
1933 mempool_destroy(nfs_commit_mempool
);
1934 kmem_cache_destroy(nfs_cdata_cachep
);
1935 mempool_destroy(nfs_wdata_mempool
);
1936 kmem_cache_destroy(nfs_wdata_cachep
);