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>
24 #include <asm/uaccess.h>
26 #include "delegation.h"
33 #define NFSDBG_FACILITY NFSDBG_PAGECACHE
35 #define MIN_POOL_WRITE (32)
36 #define MIN_POOL_COMMIT (4)
39 * Local function declarations
41 static void nfs_pageio_init_write(struct nfs_pageio_descriptor
*desc
,
42 struct inode
*inode
, int ioflags
);
43 static void nfs_redirty_request(struct nfs_page
*req
);
44 static const struct rpc_call_ops nfs_write_partial_ops
;
45 static const struct rpc_call_ops nfs_write_full_ops
;
46 static const struct rpc_call_ops nfs_commit_ops
;
48 static struct kmem_cache
*nfs_wdata_cachep
;
49 static mempool_t
*nfs_wdata_mempool
;
50 static mempool_t
*nfs_commit_mempool
;
52 struct nfs_write_data
*nfs_commitdata_alloc(void)
54 struct nfs_write_data
*p
= mempool_alloc(nfs_commit_mempool
, GFP_NOFS
);
57 memset(p
, 0, sizeof(*p
));
58 INIT_LIST_HEAD(&p
->pages
);
62 EXPORT_SYMBOL_GPL(nfs_commitdata_alloc
);
64 void nfs_commit_free(struct nfs_write_data
*p
)
66 if (p
&& (p
->pagevec
!= &p
->page_array
[0]))
68 mempool_free(p
, nfs_commit_mempool
);
70 EXPORT_SYMBOL_GPL(nfs_commit_free
);
72 struct nfs_write_data
*nfs_writedata_alloc(unsigned int pagecount
)
74 struct nfs_write_data
*p
= mempool_alloc(nfs_wdata_mempool
, GFP_NOFS
);
77 memset(p
, 0, sizeof(*p
));
78 INIT_LIST_HEAD(&p
->pages
);
79 p
->npages
= pagecount
;
80 if (pagecount
<= ARRAY_SIZE(p
->page_array
))
81 p
->pagevec
= p
->page_array
;
83 p
->pagevec
= kcalloc(pagecount
, sizeof(struct page
*), GFP_NOFS
);
85 mempool_free(p
, nfs_wdata_mempool
);
93 void nfs_writedata_free(struct nfs_write_data
*p
)
95 if (p
&& (p
->pagevec
!= &p
->page_array
[0]))
97 mempool_free(p
, nfs_wdata_mempool
);
100 void nfs_writedata_release(struct nfs_write_data
*wdata
)
102 put_lseg(wdata
->lseg
);
103 put_nfs_open_context(wdata
->args
.context
);
104 nfs_writedata_free(wdata
);
107 static void nfs_context_set_write_error(struct nfs_open_context
*ctx
, int error
)
111 set_bit(NFS_CONTEXT_ERROR_WRITE
, &ctx
->flags
);
114 static struct nfs_page
*nfs_page_find_request_locked(struct page
*page
)
116 struct nfs_page
*req
= NULL
;
118 if (PagePrivate(page
)) {
119 req
= (struct nfs_page
*)page_private(page
);
121 kref_get(&req
->wb_kref
);
126 static struct nfs_page
*nfs_page_find_request(struct page
*page
)
128 struct inode
*inode
= page
->mapping
->host
;
129 struct nfs_page
*req
= NULL
;
131 spin_lock(&inode
->i_lock
);
132 req
= nfs_page_find_request_locked(page
);
133 spin_unlock(&inode
->i_lock
);
137 /* Adjust the file length if we're writing beyond the end */
138 static void nfs_grow_file(struct page
*page
, unsigned int offset
, unsigned int count
)
140 struct inode
*inode
= page
->mapping
->host
;
144 spin_lock(&inode
->i_lock
);
145 i_size
= i_size_read(inode
);
146 end_index
= (i_size
- 1) >> PAGE_CACHE_SHIFT
;
147 if (i_size
> 0 && page
->index
< end_index
)
149 end
= ((loff_t
)page
->index
<< PAGE_CACHE_SHIFT
) + ((loff_t
)offset
+count
);
152 i_size_write(inode
, end
);
153 nfs_inc_stats(inode
, NFSIOS_EXTENDWRITE
);
155 spin_unlock(&inode
->i_lock
);
158 /* A writeback failed: mark the page as bad, and invalidate the page cache */
159 static void nfs_set_pageerror(struct page
*page
)
162 nfs_zap_mapping(page
->mapping
->host
, page
->mapping
);
165 /* We can set the PG_uptodate flag if we see that a write request
166 * covers the full page.
168 static void nfs_mark_uptodate(struct page
*page
, unsigned int base
, unsigned int count
)
170 if (PageUptodate(page
))
174 if (count
!= nfs_page_length(page
))
176 SetPageUptodate(page
);
179 static int wb_priority(struct writeback_control
*wbc
)
181 if (wbc
->for_reclaim
)
182 return FLUSH_HIGHPRI
| FLUSH_STABLE
;
183 if (wbc
->for_kupdate
|| wbc
->for_background
)
184 return FLUSH_LOWPRI
| FLUSH_COND_STABLE
;
185 return FLUSH_COND_STABLE
;
189 * NFS congestion control
192 int nfs_congestion_kb
;
194 #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10))
195 #define NFS_CONGESTION_OFF_THRESH \
196 (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2))
198 static int nfs_set_page_writeback(struct page
*page
)
200 int ret
= test_set_page_writeback(page
);
203 struct inode
*inode
= page
->mapping
->host
;
204 struct nfs_server
*nfss
= NFS_SERVER(inode
);
206 page_cache_get(page
);
207 if (atomic_long_inc_return(&nfss
->writeback
) >
208 NFS_CONGESTION_ON_THRESH
) {
209 set_bdi_congested(&nfss
->backing_dev_info
,
216 static void nfs_end_page_writeback(struct page
*page
)
218 struct inode
*inode
= page
->mapping
->host
;
219 struct nfs_server
*nfss
= NFS_SERVER(inode
);
221 end_page_writeback(page
);
222 page_cache_release(page
);
223 if (atomic_long_dec_return(&nfss
->writeback
) < NFS_CONGESTION_OFF_THRESH
)
224 clear_bdi_congested(&nfss
->backing_dev_info
, BLK_RW_ASYNC
);
227 static struct nfs_page
*nfs_find_and_lock_request(struct page
*page
, bool nonblock
)
229 struct inode
*inode
= page
->mapping
->host
;
230 struct nfs_page
*req
;
233 spin_lock(&inode
->i_lock
);
235 req
= nfs_page_find_request_locked(page
);
238 if (nfs_set_page_tag_locked(req
))
240 /* Note: If we hold the page lock, as is the case in nfs_writepage,
241 * then the call to nfs_set_page_tag_locked() will always
242 * succeed provided that someone hasn't already marked the
243 * request as dirty (in which case we don't care).
245 spin_unlock(&inode
->i_lock
);
247 ret
= nfs_wait_on_request(req
);
250 nfs_release_request(req
);
253 spin_lock(&inode
->i_lock
);
255 spin_unlock(&inode
->i_lock
);
260 * Find an associated nfs write request, and prepare to flush it out
261 * May return an error if the user signalled nfs_wait_on_request().
263 static int nfs_page_async_flush(struct nfs_pageio_descriptor
*pgio
,
264 struct page
*page
, bool nonblock
)
266 struct nfs_page
*req
;
269 req
= nfs_find_and_lock_request(page
, nonblock
);
276 ret
= nfs_set_page_writeback(page
);
278 BUG_ON(test_bit(PG_CLEAN
, &req
->wb_flags
));
280 if (!nfs_pageio_add_request(pgio
, req
)) {
281 nfs_redirty_request(req
);
282 ret
= pgio
->pg_error
;
288 static int nfs_do_writepage(struct page
*page
, struct writeback_control
*wbc
, struct nfs_pageio_descriptor
*pgio
)
290 struct inode
*inode
= page
->mapping
->host
;
293 nfs_inc_stats(inode
, NFSIOS_VFSWRITEPAGE
);
294 nfs_add_stats(inode
, NFSIOS_WRITEPAGES
, 1);
296 nfs_pageio_cond_complete(pgio
, page
->index
);
297 ret
= nfs_page_async_flush(pgio
, page
, wbc
->sync_mode
== WB_SYNC_NONE
);
298 if (ret
== -EAGAIN
) {
299 redirty_page_for_writepage(wbc
, page
);
306 * Write an mmapped page to the server.
308 static int nfs_writepage_locked(struct page
*page
, struct writeback_control
*wbc
)
310 struct nfs_pageio_descriptor pgio
;
313 nfs_pageio_init_write(&pgio
, page
->mapping
->host
, wb_priority(wbc
));
314 err
= nfs_do_writepage(page
, wbc
, &pgio
);
315 nfs_pageio_complete(&pgio
);
318 if (pgio
.pg_error
< 0)
319 return pgio
.pg_error
;
323 int nfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
327 ret
= nfs_writepage_locked(page
, wbc
);
332 static int nfs_writepages_callback(struct page
*page
, struct writeback_control
*wbc
, void *data
)
336 ret
= nfs_do_writepage(page
, wbc
, data
);
341 int nfs_writepages(struct address_space
*mapping
, struct writeback_control
*wbc
)
343 struct inode
*inode
= mapping
->host
;
344 unsigned long *bitlock
= &NFS_I(inode
)->flags
;
345 struct nfs_pageio_descriptor pgio
;
348 /* Stop dirtying of new pages while we sync */
349 err
= wait_on_bit_lock(bitlock
, NFS_INO_FLUSHING
,
350 nfs_wait_bit_killable
, TASK_KILLABLE
);
354 nfs_inc_stats(inode
, NFSIOS_VFSWRITEPAGES
);
356 nfs_pageio_init_write(&pgio
, inode
, wb_priority(wbc
));
357 err
= write_cache_pages(mapping
, wbc
, nfs_writepages_callback
, &pgio
);
358 nfs_pageio_complete(&pgio
);
360 clear_bit_unlock(NFS_INO_FLUSHING
, bitlock
);
361 smp_mb__after_clear_bit();
362 wake_up_bit(bitlock
, NFS_INO_FLUSHING
);
375 * Insert a write request into an inode
377 static int nfs_inode_add_request(struct inode
*inode
, struct nfs_page
*req
)
379 struct nfs_inode
*nfsi
= NFS_I(inode
);
382 error
= radix_tree_preload(GFP_NOFS
);
386 /* Lock the request! */
387 nfs_lock_request_dontget(req
);
389 spin_lock(&inode
->i_lock
);
390 error
= radix_tree_insert(&nfsi
->nfs_page_tree
, req
->wb_index
, req
);
392 if (!nfsi
->npages
&& nfs_have_delegation(inode
, FMODE_WRITE
))
394 set_bit(PG_MAPPED
, &req
->wb_flags
);
395 SetPagePrivate(req
->wb_page
);
396 set_page_private(req
->wb_page
, (unsigned long)req
);
398 kref_get(&req
->wb_kref
);
399 radix_tree_tag_set(&nfsi
->nfs_page_tree
, req
->wb_index
,
400 NFS_PAGE_TAG_LOCKED
);
401 spin_unlock(&inode
->i_lock
);
402 radix_tree_preload_end();
408 * Remove a write request from an inode
410 static void nfs_inode_remove_request(struct nfs_page
*req
)
412 struct inode
*inode
= req
->wb_context
->dentry
->d_inode
;
413 struct nfs_inode
*nfsi
= NFS_I(inode
);
415 BUG_ON (!NFS_WBACK_BUSY(req
));
417 spin_lock(&inode
->i_lock
);
418 set_page_private(req
->wb_page
, 0);
419 ClearPagePrivate(req
->wb_page
);
420 clear_bit(PG_MAPPED
, &req
->wb_flags
);
421 radix_tree_delete(&nfsi
->nfs_page_tree
, req
->wb_index
);
423 spin_unlock(&inode
->i_lock
);
424 nfs_release_request(req
);
428 nfs_mark_request_dirty(struct nfs_page
*req
)
430 __set_page_dirty_nobuffers(req
->wb_page
);
433 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
435 * Add a request to the inode's commit list.
438 nfs_mark_request_commit(struct nfs_page
*req
, struct pnfs_layout_segment
*lseg
)
440 struct inode
*inode
= req
->wb_context
->dentry
->d_inode
;
441 struct nfs_inode
*nfsi
= NFS_I(inode
);
443 spin_lock(&inode
->i_lock
);
444 set_bit(PG_CLEAN
, &(req
)->wb_flags
);
445 radix_tree_tag_set(&nfsi
->nfs_page_tree
,
447 NFS_PAGE_TAG_COMMIT
);
449 spin_unlock(&inode
->i_lock
);
450 pnfs_mark_request_commit(req
, lseg
);
451 inc_zone_page_state(req
->wb_page
, NR_UNSTABLE_NFS
);
452 inc_bdi_stat(req
->wb_page
->mapping
->backing_dev_info
, BDI_RECLAIMABLE
);
453 __mark_inode_dirty(inode
, I_DIRTY_DATASYNC
);
457 nfs_clear_request_commit(struct nfs_page
*req
)
459 struct page
*page
= req
->wb_page
;
461 if (test_and_clear_bit(PG_CLEAN
, &(req
)->wb_flags
)) {
462 dec_zone_page_state(page
, NR_UNSTABLE_NFS
);
463 dec_bdi_stat(page
->mapping
->backing_dev_info
, BDI_RECLAIMABLE
);
470 int nfs_write_need_commit(struct nfs_write_data
*data
)
472 if (data
->verf
.committed
== NFS_DATA_SYNC
)
473 return data
->lseg
== NULL
;
475 return data
->verf
.committed
!= NFS_FILE_SYNC
;
479 int nfs_reschedule_unstable_write(struct nfs_page
*req
,
480 struct nfs_write_data
*data
)
482 if (test_and_clear_bit(PG_NEED_COMMIT
, &req
->wb_flags
)) {
483 nfs_mark_request_commit(req
, data
->lseg
);
486 if (test_and_clear_bit(PG_NEED_RESCHED
, &req
->wb_flags
)) {
487 nfs_mark_request_dirty(req
);
494 nfs_mark_request_commit(struct nfs_page
*req
, struct pnfs_layout_segment
*lseg
)
499 nfs_clear_request_commit(struct nfs_page
*req
)
505 int nfs_write_need_commit(struct nfs_write_data
*data
)
511 int nfs_reschedule_unstable_write(struct nfs_page
*req
,
512 struct nfs_write_data
*data
)
518 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
520 nfs_need_commit(struct nfs_inode
*nfsi
)
522 return radix_tree_tagged(&nfsi
->nfs_page_tree
, NFS_PAGE_TAG_COMMIT
);
526 * nfs_scan_commit - Scan an inode for commit requests
527 * @inode: NFS inode to scan
528 * @dst: destination list
529 * @idx_start: lower bound of page->index to scan.
530 * @npages: idx_start + npages sets the upper bound to scan.
532 * Moves requests from the inode's 'commit' request list.
533 * The requests are *not* checked to ensure that they form a contiguous set.
536 nfs_scan_commit(struct inode
*inode
, struct list_head
*dst
, pgoff_t idx_start
, unsigned int npages
)
538 struct nfs_inode
*nfsi
= NFS_I(inode
);
541 if (!nfs_need_commit(nfsi
))
544 spin_lock(&inode
->i_lock
);
545 ret
= nfs_scan_list(nfsi
, dst
, idx_start
, npages
, NFS_PAGE_TAG_COMMIT
);
547 nfsi
->ncommit
-= ret
;
548 spin_unlock(&inode
->i_lock
);
550 if (nfs_need_commit(NFS_I(inode
)))
551 __mark_inode_dirty(inode
, I_DIRTY_DATASYNC
);
556 static inline int nfs_need_commit(struct nfs_inode
*nfsi
)
561 static inline int nfs_scan_commit(struct inode
*inode
, struct list_head
*dst
, pgoff_t idx_start
, unsigned int npages
)
568 * Search for an existing write request, and attempt to update
569 * it to reflect a new dirty region on a given page.
571 * If the attempt fails, then the existing request is flushed out
574 static struct nfs_page
*nfs_try_to_update_request(struct inode
*inode
,
579 struct nfs_page
*req
;
584 if (!PagePrivate(page
))
587 end
= offset
+ bytes
;
588 spin_lock(&inode
->i_lock
);
591 req
= nfs_page_find_request_locked(page
);
595 rqend
= req
->wb_offset
+ req
->wb_bytes
;
597 * Tell the caller to flush out the request if
598 * the offsets are non-contiguous.
599 * Note: nfs_flush_incompatible() will already
600 * have flushed out requests having wrong owners.
603 || end
< req
->wb_offset
)
606 if (nfs_set_page_tag_locked(req
))
609 /* The request is locked, so wait and then retry */
610 spin_unlock(&inode
->i_lock
);
611 error
= nfs_wait_on_request(req
);
612 nfs_release_request(req
);
615 spin_lock(&inode
->i_lock
);
618 if (nfs_clear_request_commit(req
) &&
619 radix_tree_tag_clear(&NFS_I(inode
)->nfs_page_tree
,
620 req
->wb_index
, NFS_PAGE_TAG_COMMIT
) != NULL
) {
621 NFS_I(inode
)->ncommit
--;
622 pnfs_clear_request_commit(req
);
625 /* Okay, the request matches. Update the region */
626 if (offset
< req
->wb_offset
) {
627 req
->wb_offset
= offset
;
628 req
->wb_pgbase
= offset
;
631 req
->wb_bytes
= end
- req
->wb_offset
;
633 req
->wb_bytes
= rqend
- req
->wb_offset
;
635 spin_unlock(&inode
->i_lock
);
638 spin_unlock(&inode
->i_lock
);
639 nfs_release_request(req
);
640 error
= nfs_wb_page(inode
, page
);
642 return ERR_PTR(error
);
646 * Try to update an existing write request, or create one if there is none.
648 * Note: Should always be called with the Page Lock held to prevent races
649 * if we have to add a new request. Also assumes that the caller has
650 * already called nfs_flush_incompatible() if necessary.
652 static struct nfs_page
* nfs_setup_write_request(struct nfs_open_context
* ctx
,
653 struct page
*page
, unsigned int offset
, unsigned int bytes
)
655 struct inode
*inode
= page
->mapping
->host
;
656 struct nfs_page
*req
;
659 req
= nfs_try_to_update_request(inode
, page
, offset
, bytes
);
662 req
= nfs_create_request(ctx
, inode
, page
, offset
, bytes
);
665 error
= nfs_inode_add_request(inode
, req
);
667 nfs_release_request(req
);
668 req
= ERR_PTR(error
);
674 static int nfs_writepage_setup(struct nfs_open_context
*ctx
, struct page
*page
,
675 unsigned int offset
, unsigned int count
)
677 struct nfs_page
*req
;
679 req
= nfs_setup_write_request(ctx
, page
, offset
, count
);
682 /* Update file length */
683 nfs_grow_file(page
, offset
, count
);
684 nfs_mark_uptodate(page
, req
->wb_pgbase
, req
->wb_bytes
);
685 nfs_mark_request_dirty(req
);
686 nfs_clear_page_tag_locked(req
);
690 int nfs_flush_incompatible(struct file
*file
, struct page
*page
)
692 struct nfs_open_context
*ctx
= nfs_file_open_context(file
);
693 struct nfs_page
*req
;
694 int do_flush
, status
;
696 * Look for a request corresponding to this page. If there
697 * is one, and it belongs to another file, we flush it out
698 * before we try to copy anything into the page. Do this
699 * due to the lack of an ACCESS-type call in NFSv2.
700 * Also do the same if we find a request from an existing
704 req
= nfs_page_find_request(page
);
707 do_flush
= req
->wb_page
!= page
|| req
->wb_context
!= ctx
||
708 req
->wb_lock_context
->lockowner
!= current
->files
||
709 req
->wb_lock_context
->pid
!= current
->tgid
;
710 nfs_release_request(req
);
713 status
= nfs_wb_page(page
->mapping
->host
, page
);
714 } while (status
== 0);
719 * If the page cache is marked as unsafe or invalid, then we can't rely on
720 * the PageUptodate() flag. In this case, we will need to turn off
721 * write optimisations that depend on the page contents being correct.
723 static int nfs_write_pageuptodate(struct page
*page
, struct inode
*inode
)
725 return PageUptodate(page
) &&
726 !(NFS_I(inode
)->cache_validity
& (NFS_INO_REVAL_PAGECACHE
|NFS_INO_INVALID_DATA
));
730 * Update and possibly write a cached page of an NFS file.
732 * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad
733 * things with a page scheduled for an RPC call (e.g. invalidate it).
735 int nfs_updatepage(struct file
*file
, struct page
*page
,
736 unsigned int offset
, unsigned int count
)
738 struct nfs_open_context
*ctx
= nfs_file_open_context(file
);
739 struct inode
*inode
= page
->mapping
->host
;
742 nfs_inc_stats(inode
, NFSIOS_VFSUPDATEPAGE
);
744 dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n",
745 file
->f_path
.dentry
->d_parent
->d_name
.name
,
746 file
->f_path
.dentry
->d_name
.name
, count
,
747 (long long)(page_offset(page
) + offset
));
749 /* If we're not using byte range locks, and we know the page
750 * is up to date, it may be more efficient to extend the write
751 * to cover the entire page in order to avoid fragmentation
754 if (nfs_write_pageuptodate(page
, inode
) &&
755 inode
->i_flock
== NULL
&&
756 !(file
->f_flags
& O_DSYNC
)) {
757 count
= max(count
+ offset
, nfs_page_length(page
));
761 status
= nfs_writepage_setup(ctx
, page
, offset
, count
);
763 nfs_set_pageerror(page
);
765 __set_page_dirty_nobuffers(page
);
767 dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n",
768 status
, (long long)i_size_read(inode
));
772 static void nfs_writepage_release(struct nfs_page
*req
,
773 struct nfs_write_data
*data
)
775 struct page
*page
= req
->wb_page
;
777 if (PageError(req
->wb_page
) || !nfs_reschedule_unstable_write(req
, data
))
778 nfs_inode_remove_request(req
);
779 nfs_clear_page_tag_locked(req
);
780 nfs_end_page_writeback(page
);
783 static int flush_task_priority(int how
)
785 switch (how
& (FLUSH_HIGHPRI
|FLUSH_LOWPRI
)) {
787 return RPC_PRIORITY_HIGH
;
789 return RPC_PRIORITY_LOW
;
791 return RPC_PRIORITY_NORMAL
;
794 int nfs_initiate_write(struct nfs_write_data
*data
,
795 struct rpc_clnt
*clnt
,
796 const struct rpc_call_ops
*call_ops
,
799 struct inode
*inode
= data
->inode
;
800 int priority
= flush_task_priority(how
);
801 struct rpc_task
*task
;
802 struct rpc_message msg
= {
803 .rpc_argp
= &data
->args
,
804 .rpc_resp
= &data
->res
,
805 .rpc_cred
= data
->cred
,
807 struct rpc_task_setup task_setup_data
= {
811 .callback_ops
= call_ops
,
812 .callback_data
= data
,
813 .workqueue
= nfsiod_workqueue
,
814 .flags
= RPC_TASK_ASYNC
,
815 .priority
= priority
,
819 /* Set up the initial task struct. */
820 NFS_PROTO(inode
)->write_setup(data
, &msg
);
822 dprintk("NFS: %5u initiated write call "
823 "(req %s/%lld, %u bytes @ offset %llu)\n",
826 (long long)NFS_FILEID(inode
),
828 (unsigned long long)data
->args
.offset
);
830 task
= rpc_run_task(&task_setup_data
);
835 if (how
& FLUSH_SYNC
) {
836 ret
= rpc_wait_for_completion_task(task
);
838 ret
= task
->tk_status
;
844 EXPORT_SYMBOL_GPL(nfs_initiate_write
);
847 * Set up the argument/result storage required for the RPC call.
849 static void nfs_write_rpcsetup(struct nfs_page
*req
,
850 struct nfs_write_data
*data
,
851 unsigned int count
, unsigned int offset
,
854 struct inode
*inode
= req
->wb_context
->dentry
->d_inode
;
856 /* Set up the RPC argument and reply structs
857 * NB: take care not to mess about with data->commit et al. */
860 data
->inode
= inode
= req
->wb_context
->dentry
->d_inode
;
861 data
->cred
= req
->wb_context
->cred
;
863 data
->args
.fh
= NFS_FH(inode
);
864 data
->args
.offset
= req_offset(req
) + offset
;
865 /* pnfs_set_layoutcommit needs this */
866 data
->mds_offset
= data
->args
.offset
;
867 data
->args
.pgbase
= req
->wb_pgbase
+ offset
;
868 data
->args
.pages
= data
->pagevec
;
869 data
->args
.count
= count
;
870 data
->args
.context
= get_nfs_open_context(req
->wb_context
);
871 data
->args
.lock_context
= req
->wb_lock_context
;
872 data
->args
.stable
= NFS_UNSTABLE
;
873 switch (how
& (FLUSH_STABLE
| FLUSH_COND_STABLE
)) {
876 case FLUSH_COND_STABLE
:
877 if (nfs_need_commit(NFS_I(inode
)))
880 data
->args
.stable
= NFS_FILE_SYNC
;
883 data
->res
.fattr
= &data
->fattr
;
884 data
->res
.count
= count
;
885 data
->res
.verf
= &data
->verf
;
886 nfs_fattr_init(&data
->fattr
);
889 static int nfs_do_write(struct nfs_write_data
*data
,
890 const struct rpc_call_ops
*call_ops
,
893 struct inode
*inode
= data
->args
.context
->dentry
->d_inode
;
895 return nfs_initiate_write(data
, NFS_CLIENT(inode
), call_ops
, how
);
898 static int nfs_do_multiple_writes(struct list_head
*head
,
899 const struct rpc_call_ops
*call_ops
,
902 struct nfs_write_data
*data
;
905 while (!list_empty(head
)) {
908 data
= list_entry(head
->next
, struct nfs_write_data
, list
);
909 list_del_init(&data
->list
);
911 ret2
= nfs_do_write(data
, call_ops
, how
);
918 /* If a nfs_flush_* function fails, it should remove reqs from @head and
919 * call this on each, which will prepare them to be retried on next
920 * writeback using standard nfs.
922 static void nfs_redirty_request(struct nfs_page
*req
)
924 struct page
*page
= req
->wb_page
;
926 nfs_mark_request_dirty(req
);
927 nfs_clear_page_tag_locked(req
);
928 nfs_end_page_writeback(page
);
932 * Generate multiple small requests to write out a single
933 * contiguous dirty area on one page.
935 static int nfs_flush_multi(struct nfs_pageio_descriptor
*desc
, struct list_head
*res
)
937 struct nfs_page
*req
= nfs_list_entry(desc
->pg_list
.next
);
938 struct page
*page
= req
->wb_page
;
939 struct nfs_write_data
*data
;
940 size_t wsize
= desc
->pg_bsize
, nbytes
;
945 nfs_list_remove_request(req
);
947 if ((desc
->pg_ioflags
& FLUSH_COND_STABLE
) &&
948 (desc
->pg_moreio
|| NFS_I(desc
->pg_inode
)->ncommit
||
949 desc
->pg_count
> wsize
))
950 desc
->pg_ioflags
&= ~FLUSH_COND_STABLE
;
954 nbytes
= desc
->pg_count
;
956 size_t len
= min(nbytes
, wsize
);
958 data
= nfs_writedata_alloc(1);
961 data
->pagevec
[0] = page
;
962 nfs_write_rpcsetup(req
, data
, len
, offset
, desc
->pg_ioflags
);
963 list_add(&data
->list
, res
);
967 } while (nbytes
!= 0);
968 atomic_set(&req
->wb_complete
, requests
);
969 desc
->pg_rpc_callops
= &nfs_write_partial_ops
;
973 while (!list_empty(res
)) {
974 data
= list_entry(res
->next
, struct nfs_write_data
, list
);
975 list_del(&data
->list
);
976 nfs_writedata_free(data
);
978 nfs_redirty_request(req
);
983 * Create an RPC task for the given write request and kick it.
984 * The page must have been locked by the caller.
986 * It may happen that the page we're passed is not marked dirty.
987 * This is the case if nfs_updatepage detects a conflicting request
988 * that has been written but not committed.
990 static int nfs_flush_one(struct nfs_pageio_descriptor
*desc
, struct list_head
*res
)
992 struct nfs_page
*req
;
994 struct nfs_write_data
*data
;
995 struct list_head
*head
= &desc
->pg_list
;
998 data
= nfs_writedata_alloc(nfs_page_array_len(desc
->pg_base
,
1001 while (!list_empty(head
)) {
1002 req
= nfs_list_entry(head
->next
);
1003 nfs_list_remove_request(req
);
1004 nfs_redirty_request(req
);
1009 pages
= data
->pagevec
;
1010 while (!list_empty(head
)) {
1011 req
= nfs_list_entry(head
->next
);
1012 nfs_list_remove_request(req
);
1013 nfs_list_add_request(req
, &data
->pages
);
1014 ClearPageError(req
->wb_page
);
1015 *pages
++ = req
->wb_page
;
1017 req
= nfs_list_entry(data
->pages
.next
);
1019 if ((desc
->pg_ioflags
& FLUSH_COND_STABLE
) &&
1020 (desc
->pg_moreio
|| NFS_I(desc
->pg_inode
)->ncommit
))
1021 desc
->pg_ioflags
&= ~FLUSH_COND_STABLE
;
1023 /* Set up the argument struct */
1024 nfs_write_rpcsetup(req
, data
, desc
->pg_count
, 0, desc
->pg_ioflags
);
1025 list_add(&data
->list
, res
);
1026 desc
->pg_rpc_callops
= &nfs_write_full_ops
;
1031 int nfs_generic_flush(struct nfs_pageio_descriptor
*desc
, struct list_head
*head
)
1033 if (desc
->pg_bsize
< PAGE_CACHE_SIZE
)
1034 return nfs_flush_multi(desc
, head
);
1035 return nfs_flush_one(desc
, head
);
1038 static int nfs_generic_pg_writepages(struct nfs_pageio_descriptor
*desc
)
1043 ret
= nfs_generic_flush(desc
, &head
);
1045 ret
= nfs_do_multiple_writes(&head
, desc
->pg_rpc_callops
,
1050 static const struct nfs_pageio_ops nfs_pageio_write_ops
= {
1051 .pg_test
= nfs_generic_pg_test
,
1052 .pg_doio
= nfs_generic_pg_writepages
,
1055 static void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor
*pgio
,
1056 struct inode
*inode
, int ioflags
)
1058 nfs_pageio_init(pgio
, inode
, &nfs_pageio_write_ops
,
1059 NFS_SERVER(inode
)->wsize
, ioflags
);
1062 void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor
*pgio
)
1064 pgio
->pg_ops
= &nfs_pageio_write_ops
;
1065 pgio
->pg_bsize
= NFS_SERVER(pgio
->pg_inode
)->wsize
;
1067 EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds
);
1069 static void nfs_pageio_init_write(struct nfs_pageio_descriptor
*pgio
,
1070 struct inode
*inode
, int ioflags
)
1072 if (!pnfs_pageio_init_write(pgio
, inode
, ioflags
))
1073 nfs_pageio_init_write_mds(pgio
, inode
, ioflags
);
1077 * Handle a write reply that flushed part of a page.
1079 static void nfs_writeback_done_partial(struct rpc_task
*task
, void *calldata
)
1081 struct nfs_write_data
*data
= calldata
;
1083 dprintk("NFS: %5u write(%s/%lld %d@%lld)",
1085 data
->req
->wb_context
->dentry
->d_inode
->i_sb
->s_id
,
1087 NFS_FILEID(data
->req
->wb_context
->dentry
->d_inode
),
1088 data
->req
->wb_bytes
, (long long)req_offset(data
->req
));
1090 nfs_writeback_done(task
, data
);
1093 static void nfs_writeback_release_partial(void *calldata
)
1095 struct nfs_write_data
*data
= calldata
;
1096 struct nfs_page
*req
= data
->req
;
1097 struct page
*page
= req
->wb_page
;
1098 int status
= data
->task
.tk_status
;
1101 nfs_set_pageerror(page
);
1102 nfs_context_set_write_error(req
->wb_context
, status
);
1103 dprintk(", error = %d\n", status
);
1107 if (nfs_write_need_commit(data
)) {
1108 struct inode
*inode
= page
->mapping
->host
;
1110 spin_lock(&inode
->i_lock
);
1111 if (test_bit(PG_NEED_RESCHED
, &req
->wb_flags
)) {
1112 /* Do nothing we need to resend the writes */
1113 } else if (!test_and_set_bit(PG_NEED_COMMIT
, &req
->wb_flags
)) {
1114 memcpy(&req
->wb_verf
, &data
->verf
, sizeof(req
->wb_verf
));
1115 dprintk(" defer commit\n");
1116 } else if (memcmp(&req
->wb_verf
, &data
->verf
, sizeof(req
->wb_verf
))) {
1117 set_bit(PG_NEED_RESCHED
, &req
->wb_flags
);
1118 clear_bit(PG_NEED_COMMIT
, &req
->wb_flags
);
1119 dprintk(" server reboot detected\n");
1121 spin_unlock(&inode
->i_lock
);
1126 if (atomic_dec_and_test(&req
->wb_complete
))
1127 nfs_writepage_release(req
, data
);
1128 nfs_writedata_release(calldata
);
1131 #if defined(CONFIG_NFS_V4_1)
1132 void nfs_write_prepare(struct rpc_task
*task
, void *calldata
)
1134 struct nfs_write_data
*data
= calldata
;
1136 if (nfs4_setup_sequence(NFS_SERVER(data
->inode
),
1137 &data
->args
.seq_args
,
1138 &data
->res
.seq_res
, 1, task
))
1140 rpc_call_start(task
);
1142 #endif /* CONFIG_NFS_V4_1 */
1144 static const struct rpc_call_ops nfs_write_partial_ops
= {
1145 #if defined(CONFIG_NFS_V4_1)
1146 .rpc_call_prepare
= nfs_write_prepare
,
1147 #endif /* CONFIG_NFS_V4_1 */
1148 .rpc_call_done
= nfs_writeback_done_partial
,
1149 .rpc_release
= nfs_writeback_release_partial
,
1153 * Handle a write reply that flushes a whole page.
1155 * FIXME: There is an inherent race with invalidate_inode_pages and
1156 * writebacks since the page->count is kept > 1 for as long
1157 * as the page has a write request pending.
1159 static void nfs_writeback_done_full(struct rpc_task
*task
, void *calldata
)
1161 struct nfs_write_data
*data
= calldata
;
1163 nfs_writeback_done(task
, data
);
1166 static void nfs_writeback_release_full(void *calldata
)
1168 struct nfs_write_data
*data
= calldata
;
1169 int ret
, status
= data
->task
.tk_status
;
1170 struct nfs_pageio_descriptor pgio
;
1172 if (data
->pnfs_error
) {
1173 nfs_pageio_init_write_mds(&pgio
, data
->inode
, FLUSH_STABLE
);
1174 pgio
.pg_recoalesce
= 1;
1177 /* Update attributes as result of writeback. */
1178 while (!list_empty(&data
->pages
)) {
1179 struct nfs_page
*req
= nfs_list_entry(data
->pages
.next
);
1180 struct page
*page
= req
->wb_page
;
1182 nfs_list_remove_request(req
);
1184 dprintk("NFS: %5u write (%s/%lld %d@%lld)",
1186 req
->wb_context
->dentry
->d_inode
->i_sb
->s_id
,
1187 (long long)NFS_FILEID(req
->wb_context
->dentry
->d_inode
),
1189 (long long)req_offset(req
));
1191 if (data
->pnfs_error
) {
1192 dprintk(", pnfs error = %d\n", data
->pnfs_error
);
1197 nfs_set_pageerror(page
);
1198 nfs_context_set_write_error(req
->wb_context
, status
);
1199 dprintk(", error = %d\n", status
);
1200 goto remove_request
;
1203 if (nfs_write_need_commit(data
)) {
1204 memcpy(&req
->wb_verf
, &data
->verf
, sizeof(req
->wb_verf
));
1205 nfs_mark_request_commit(req
, data
->lseg
);
1206 dprintk(" marked for commit\n");
1211 nfs_inode_remove_request(req
);
1213 nfs_clear_page_tag_locked(req
);
1214 nfs_end_page_writeback(page
);
1215 if (data
->pnfs_error
) {
1217 nfs_pageio_cond_complete(&pgio
, page
->index
);
1218 ret
= nfs_page_async_flush(&pgio
, page
, 0);
1220 nfs_set_pageerror(page
);
1221 dprintk("rewrite to MDS error = %d\n", ret
);
1226 if (data
->pnfs_error
)
1227 nfs_pageio_complete(&pgio
);
1228 nfs_writedata_release(calldata
);
1231 static const struct rpc_call_ops nfs_write_full_ops
= {
1232 #if defined(CONFIG_NFS_V4_1)
1233 .rpc_call_prepare
= nfs_write_prepare
,
1234 #endif /* CONFIG_NFS_V4_1 */
1235 .rpc_call_done
= nfs_writeback_done_full
,
1236 .rpc_release
= nfs_writeback_release_full
,
1241 * This function is called when the WRITE call is complete.
1243 void nfs_writeback_done(struct rpc_task
*task
, struct nfs_write_data
*data
)
1245 struct nfs_writeargs
*argp
= &data
->args
;
1246 struct nfs_writeres
*resp
= &data
->res
;
1247 struct nfs_server
*server
= NFS_SERVER(data
->inode
);
1250 dprintk("NFS: %5u nfs_writeback_done (status %d)\n",
1251 task
->tk_pid
, task
->tk_status
);
1254 * ->write_done will attempt to use post-op attributes to detect
1255 * conflicting writes by other clients. A strict interpretation
1256 * of close-to-open would allow us to continue caching even if
1257 * another writer had changed the file, but some applications
1258 * depend on tighter cache coherency when writing.
1260 status
= NFS_PROTO(data
->inode
)->write_done(task
, data
);
1263 nfs_add_stats(data
->inode
, NFSIOS_SERVERWRITTENBYTES
, resp
->count
);
1265 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1266 if (resp
->verf
->committed
< argp
->stable
&& task
->tk_status
>= 0) {
1267 /* We tried a write call, but the server did not
1268 * commit data to stable storage even though we
1270 * Note: There is a known bug in Tru64 < 5.0 in which
1271 * the server reports NFS_DATA_SYNC, but performs
1272 * NFS_FILE_SYNC. We therefore implement this checking
1273 * as a dprintk() in order to avoid filling syslog.
1275 static unsigned long complain
;
1277 /* Note this will print the MDS for a DS write */
1278 if (time_before(complain
, jiffies
)) {
1279 dprintk("NFS: faulty NFS server %s:"
1280 " (committed = %d) != (stable = %d)\n",
1281 server
->nfs_client
->cl_hostname
,
1282 resp
->verf
->committed
, argp
->stable
);
1283 complain
= jiffies
+ 300 * HZ
;
1287 /* Is this a short write? */
1288 if (task
->tk_status
>= 0 && resp
->count
< argp
->count
) {
1289 static unsigned long complain
;
1291 nfs_inc_stats(data
->inode
, NFSIOS_SHORTWRITE
);
1293 /* Has the server at least made some progress? */
1294 if (resp
->count
!= 0) {
1295 /* Was this an NFSv2 write or an NFSv3 stable write? */
1296 if (resp
->verf
->committed
!= NFS_UNSTABLE
) {
1297 /* Resend from where the server left off */
1298 data
->mds_offset
+= resp
->count
;
1299 argp
->offset
+= resp
->count
;
1300 argp
->pgbase
+= resp
->count
;
1301 argp
->count
-= resp
->count
;
1303 /* Resend as a stable write in order to avoid
1304 * headaches in the case of a server crash.
1306 argp
->stable
= NFS_FILE_SYNC
;
1308 rpc_restart_call_prepare(task
);
1311 if (time_before(complain
, jiffies
)) {
1313 "NFS: Server wrote zero bytes, expected %u.\n",
1315 complain
= jiffies
+ 300 * HZ
;
1317 /* Can't do anything about it except throw an error. */
1318 task
->tk_status
= -EIO
;
1324 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1325 static int nfs_commit_set_lock(struct nfs_inode
*nfsi
, int may_wait
)
1329 if (!test_and_set_bit(NFS_INO_COMMIT
, &nfsi
->flags
))
1333 ret
= out_of_line_wait_on_bit_lock(&nfsi
->flags
,
1335 nfs_wait_bit_killable
,
1337 return (ret
< 0) ? ret
: 1;
1340 void nfs_commit_clear_lock(struct nfs_inode
*nfsi
)
1342 clear_bit(NFS_INO_COMMIT
, &nfsi
->flags
);
1343 smp_mb__after_clear_bit();
1344 wake_up_bit(&nfsi
->flags
, NFS_INO_COMMIT
);
1346 EXPORT_SYMBOL_GPL(nfs_commit_clear_lock
);
1348 void nfs_commitdata_release(void *data
)
1350 struct nfs_write_data
*wdata
= data
;
1352 put_lseg(wdata
->lseg
);
1353 put_nfs_open_context(wdata
->args
.context
);
1354 nfs_commit_free(wdata
);
1356 EXPORT_SYMBOL_GPL(nfs_commitdata_release
);
1358 int nfs_initiate_commit(struct nfs_write_data
*data
, struct rpc_clnt
*clnt
,
1359 const struct rpc_call_ops
*call_ops
,
1362 struct rpc_task
*task
;
1363 int priority
= flush_task_priority(how
);
1364 struct rpc_message msg
= {
1365 .rpc_argp
= &data
->args
,
1366 .rpc_resp
= &data
->res
,
1367 .rpc_cred
= data
->cred
,
1369 struct rpc_task_setup task_setup_data
= {
1370 .task
= &data
->task
,
1372 .rpc_message
= &msg
,
1373 .callback_ops
= call_ops
,
1374 .callback_data
= data
,
1375 .workqueue
= nfsiod_workqueue
,
1376 .flags
= RPC_TASK_ASYNC
,
1377 .priority
= priority
,
1379 /* Set up the initial task struct. */
1380 NFS_PROTO(data
->inode
)->commit_setup(data
, &msg
);
1382 dprintk("NFS: %5u initiated commit call\n", data
->task
.tk_pid
);
1384 task
= rpc_run_task(&task_setup_data
);
1386 return PTR_ERR(task
);
1387 if (how
& FLUSH_SYNC
)
1388 rpc_wait_for_completion_task(task
);
1392 EXPORT_SYMBOL_GPL(nfs_initiate_commit
);
1395 * Set up the argument/result storage required for the RPC call.
1397 void nfs_init_commit(struct nfs_write_data
*data
,
1398 struct list_head
*head
,
1399 struct pnfs_layout_segment
*lseg
)
1401 struct nfs_page
*first
= nfs_list_entry(head
->next
);
1402 struct inode
*inode
= first
->wb_context
->dentry
->d_inode
;
1404 /* Set up the RPC argument and reply structs
1405 * NB: take care not to mess about with data->commit et al. */
1407 list_splice_init(head
, &data
->pages
);
1409 data
->inode
= inode
;
1410 data
->cred
= first
->wb_context
->cred
;
1411 data
->lseg
= lseg
; /* reference transferred */
1412 data
->mds_ops
= &nfs_commit_ops
;
1414 data
->args
.fh
= NFS_FH(data
->inode
);
1415 /* Note: we always request a commit of the entire inode */
1416 data
->args
.offset
= 0;
1417 data
->args
.count
= 0;
1418 data
->args
.context
= get_nfs_open_context(first
->wb_context
);
1419 data
->res
.count
= 0;
1420 data
->res
.fattr
= &data
->fattr
;
1421 data
->res
.verf
= &data
->verf
;
1422 nfs_fattr_init(&data
->fattr
);
1424 EXPORT_SYMBOL_GPL(nfs_init_commit
);
1426 void nfs_retry_commit(struct list_head
*page_list
,
1427 struct pnfs_layout_segment
*lseg
)
1429 struct nfs_page
*req
;
1431 while (!list_empty(page_list
)) {
1432 req
= nfs_list_entry(page_list
->next
);
1433 nfs_list_remove_request(req
);
1434 nfs_mark_request_commit(req
, lseg
);
1435 dec_zone_page_state(req
->wb_page
, NR_UNSTABLE_NFS
);
1436 dec_bdi_stat(req
->wb_page
->mapping
->backing_dev_info
,
1438 nfs_clear_page_tag_locked(req
);
1441 EXPORT_SYMBOL_GPL(nfs_retry_commit
);
1444 * Commit dirty pages
1447 nfs_commit_list(struct inode
*inode
, struct list_head
*head
, int how
)
1449 struct nfs_write_data
*data
;
1451 data
= nfs_commitdata_alloc();
1456 /* Set up the argument struct */
1457 nfs_init_commit(data
, head
, NULL
);
1458 return nfs_initiate_commit(data
, NFS_CLIENT(inode
), data
->mds_ops
, how
);
1460 nfs_retry_commit(head
, NULL
);
1461 nfs_commit_clear_lock(NFS_I(inode
));
1466 * COMMIT call returned
1468 static void nfs_commit_done(struct rpc_task
*task
, void *calldata
)
1470 struct nfs_write_data
*data
= calldata
;
1472 dprintk("NFS: %5u nfs_commit_done (status %d)\n",
1473 task
->tk_pid
, task
->tk_status
);
1475 /* Call the NFS version-specific code */
1476 NFS_PROTO(data
->inode
)->commit_done(task
, data
);
1479 void nfs_commit_release_pages(struct nfs_write_data
*data
)
1481 struct nfs_page
*req
;
1482 int status
= data
->task
.tk_status
;
1484 while (!list_empty(&data
->pages
)) {
1485 req
= nfs_list_entry(data
->pages
.next
);
1486 nfs_list_remove_request(req
);
1487 nfs_clear_request_commit(req
);
1489 dprintk("NFS: commit (%s/%lld %d@%lld)",
1490 req
->wb_context
->dentry
->d_sb
->s_id
,
1491 (long long)NFS_FILEID(req
->wb_context
->dentry
->d_inode
),
1493 (long long)req_offset(req
));
1495 nfs_context_set_write_error(req
->wb_context
, status
);
1496 nfs_inode_remove_request(req
);
1497 dprintk(", error = %d\n", status
);
1501 /* Okay, COMMIT succeeded, apparently. Check the verifier
1502 * returned by the server against all stored verfs. */
1503 if (!memcmp(req
->wb_verf
.verifier
, data
->verf
.verifier
, sizeof(data
->verf
.verifier
))) {
1504 /* We have a match */
1505 nfs_inode_remove_request(req
);
1509 /* We have a mismatch. Write the page again */
1510 dprintk(" mismatch\n");
1511 nfs_mark_request_dirty(req
);
1513 nfs_clear_page_tag_locked(req
);
1516 EXPORT_SYMBOL_GPL(nfs_commit_release_pages
);
1518 static void nfs_commit_release(void *calldata
)
1520 struct nfs_write_data
*data
= calldata
;
1522 nfs_commit_release_pages(data
);
1523 nfs_commit_clear_lock(NFS_I(data
->inode
));
1524 nfs_commitdata_release(calldata
);
1527 static const struct rpc_call_ops nfs_commit_ops
= {
1528 #if defined(CONFIG_NFS_V4_1)
1529 .rpc_call_prepare
= nfs_write_prepare
,
1530 #endif /* CONFIG_NFS_V4_1 */
1531 .rpc_call_done
= nfs_commit_done
,
1532 .rpc_release
= nfs_commit_release
,
1535 int nfs_commit_inode(struct inode
*inode
, int how
)
1538 int may_wait
= how
& FLUSH_SYNC
;
1541 res
= nfs_commit_set_lock(NFS_I(inode
), may_wait
);
1543 goto out_mark_dirty
;
1544 res
= nfs_scan_commit(inode
, &head
, 0, 0);
1548 error
= pnfs_commit_list(inode
, &head
, how
);
1549 if (error
== PNFS_NOT_ATTEMPTED
)
1550 error
= nfs_commit_list(inode
, &head
, how
);
1554 goto out_mark_dirty
;
1555 error
= wait_on_bit(&NFS_I(inode
)->flags
,
1557 nfs_wait_bit_killable
,
1562 nfs_commit_clear_lock(NFS_I(inode
));
1564 /* Note: If we exit without ensuring that the commit is complete,
1565 * we must mark the inode as dirty. Otherwise, future calls to
1566 * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure
1567 * that the data is on the disk.
1570 __mark_inode_dirty(inode
, I_DIRTY_DATASYNC
);
1574 static int nfs_commit_unstable_pages(struct inode
*inode
, struct writeback_control
*wbc
)
1576 struct nfs_inode
*nfsi
= NFS_I(inode
);
1577 int flags
= FLUSH_SYNC
;
1580 /* no commits means nothing needs to be done */
1584 if (wbc
->sync_mode
== WB_SYNC_NONE
) {
1585 /* Don't commit yet if this is a non-blocking flush and there
1586 * are a lot of outstanding writes for this mapping.
1588 if (nfsi
->ncommit
<= (nfsi
->npages
>> 1))
1589 goto out_mark_dirty
;
1591 /* don't wait for the COMMIT response */
1595 ret
= nfs_commit_inode(inode
, flags
);
1597 if (wbc
->sync_mode
== WB_SYNC_NONE
) {
1598 if (ret
< wbc
->nr_to_write
)
1599 wbc
->nr_to_write
-= ret
;
1601 wbc
->nr_to_write
= 0;
1606 __mark_inode_dirty(inode
, I_DIRTY_DATASYNC
);
1610 static int nfs_commit_unstable_pages(struct inode
*inode
, struct writeback_control
*wbc
)
1616 int nfs_write_inode(struct inode
*inode
, struct writeback_control
*wbc
)
1620 ret
= nfs_commit_unstable_pages(inode
, wbc
);
1621 if (ret
>= 0 && test_bit(NFS_INO_LAYOUTCOMMIT
, &NFS_I(inode
)->flags
)) {
1625 if (wbc
->sync_mode
== WB_SYNC_NONE
)
1628 status
= pnfs_layoutcommit_inode(inode
, sync
);
1636 * flush the inode to disk.
1638 int nfs_wb_all(struct inode
*inode
)
1640 struct writeback_control wbc
= {
1641 .sync_mode
= WB_SYNC_ALL
,
1642 .nr_to_write
= LONG_MAX
,
1644 .range_end
= LLONG_MAX
,
1647 return sync_inode(inode
, &wbc
);
1650 int nfs_wb_page_cancel(struct inode
*inode
, struct page
*page
)
1652 struct nfs_page
*req
;
1655 BUG_ON(!PageLocked(page
));
1657 wait_on_page_writeback(page
);
1658 req
= nfs_page_find_request(page
);
1661 if (nfs_lock_request_dontget(req
)) {
1662 nfs_inode_remove_request(req
);
1664 * In case nfs_inode_remove_request has marked the
1665 * page as being dirty
1667 cancel_dirty_page(page
, PAGE_CACHE_SIZE
);
1668 nfs_unlock_request(req
);
1671 ret
= nfs_wait_on_request(req
);
1672 nfs_release_request(req
);
1680 * Write back all requests on one page - we do this before reading it.
1682 int nfs_wb_page(struct inode
*inode
, struct page
*page
)
1684 loff_t range_start
= page_offset(page
);
1685 loff_t range_end
= range_start
+ (loff_t
)(PAGE_CACHE_SIZE
- 1);
1686 struct writeback_control wbc
= {
1687 .sync_mode
= WB_SYNC_ALL
,
1689 .range_start
= range_start
,
1690 .range_end
= range_end
,
1695 wait_on_page_writeback(page
);
1696 if (clear_page_dirty_for_io(page
)) {
1697 ret
= nfs_writepage_locked(page
, &wbc
);
1702 if (!PagePrivate(page
))
1704 ret
= nfs_commit_inode(inode
, FLUSH_SYNC
);
1713 #ifdef CONFIG_MIGRATION
1714 int nfs_migrate_page(struct address_space
*mapping
, struct page
*newpage
,
1718 * If PagePrivate is set, then the page is currently associated with
1719 * an in-progress read or write request. Don't try to migrate it.
1721 * FIXME: we could do this in principle, but we'll need a way to ensure
1722 * that we can safely release the inode reference while holding
1725 if (PagePrivate(page
))
1728 nfs_fscache_release_page(page
, GFP_KERNEL
);
1730 return migrate_page(mapping
, newpage
, page
);
1734 int __init
nfs_init_writepagecache(void)
1736 nfs_wdata_cachep
= kmem_cache_create("nfs_write_data",
1737 sizeof(struct nfs_write_data
),
1738 0, SLAB_HWCACHE_ALIGN
,
1740 if (nfs_wdata_cachep
== NULL
)
1743 nfs_wdata_mempool
= mempool_create_slab_pool(MIN_POOL_WRITE
,
1745 if (nfs_wdata_mempool
== NULL
)
1748 nfs_commit_mempool
= mempool_create_slab_pool(MIN_POOL_COMMIT
,
1750 if (nfs_commit_mempool
== NULL
)
1754 * NFS congestion size, scale with available memory.
1766 * This allows larger machines to have larger/more transfers.
1767 * Limit the default to 256M
1769 nfs_congestion_kb
= (16*int_sqrt(totalram_pages
)) << (PAGE_SHIFT
-10);
1770 if (nfs_congestion_kb
> 256*1024)
1771 nfs_congestion_kb
= 256*1024;
1776 void nfs_destroy_writepagecache(void)
1778 mempool_destroy(nfs_commit_mempool
);
1779 mempool_destroy(nfs_wdata_mempool
);
1780 kmem_cache_destroy(nfs_wdata_cachep
);