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"
32 #define NFSDBG_FACILITY NFSDBG_PAGECACHE
34 #define MIN_POOL_WRITE (32)
35 #define MIN_POOL_COMMIT (4)
38 * Local function declarations
40 static void nfs_pageio_init_write(struct nfs_pageio_descriptor
*desc
,
41 struct inode
*inode
, int ioflags
);
42 static void nfs_redirty_request(struct nfs_page
*req
);
43 static const struct rpc_call_ops nfs_write_partial_ops
;
44 static const struct rpc_call_ops nfs_write_full_ops
;
45 static const struct rpc_call_ops nfs_commit_ops
;
47 static struct kmem_cache
*nfs_wdata_cachep
;
48 static mempool_t
*nfs_wdata_mempool
;
49 static mempool_t
*nfs_commit_mempool
;
51 struct nfs_write_data
*nfs_commitdata_alloc(void)
53 struct nfs_write_data
*p
= mempool_alloc(nfs_commit_mempool
, GFP_NOFS
);
56 memset(p
, 0, sizeof(*p
));
57 INIT_LIST_HEAD(&p
->pages
);
58 p
->res
.seq_res
.sr_slotid
= NFS4_MAX_SLOT_TABLE
;
63 void nfs_commit_free(struct nfs_write_data
*p
)
65 if (p
&& (p
->pagevec
!= &p
->page_array
[0]))
67 mempool_free(p
, nfs_commit_mempool
);
70 struct nfs_write_data
*nfs_writedata_alloc(unsigned int pagecount
)
72 struct nfs_write_data
*p
= mempool_alloc(nfs_wdata_mempool
, GFP_NOFS
);
75 memset(p
, 0, sizeof(*p
));
76 INIT_LIST_HEAD(&p
->pages
);
77 p
->npages
= pagecount
;
78 p
->res
.seq_res
.sr_slotid
= NFS4_MAX_SLOT_TABLE
;
79 if (pagecount
<= ARRAY_SIZE(p
->page_array
))
80 p
->pagevec
= p
->page_array
;
82 p
->pagevec
= kcalloc(pagecount
, sizeof(struct page
*), GFP_NOFS
);
84 mempool_free(p
, nfs_wdata_mempool
);
92 void nfs_writedata_free(struct nfs_write_data
*p
)
94 if (p
&& (p
->pagevec
!= &p
->page_array
[0]))
96 mempool_free(p
, nfs_wdata_mempool
);
99 static void nfs_writedata_release(struct nfs_write_data
*wdata
)
101 put_nfs_open_context(wdata
->args
.context
);
102 nfs_writedata_free(wdata
);
105 static void nfs_context_set_write_error(struct nfs_open_context
*ctx
, int error
)
109 set_bit(NFS_CONTEXT_ERROR_WRITE
, &ctx
->flags
);
112 static struct nfs_page
*nfs_page_find_request_locked(struct page
*page
)
114 struct nfs_page
*req
= NULL
;
116 if (PagePrivate(page
)) {
117 req
= (struct nfs_page
*)page_private(page
);
119 kref_get(&req
->wb_kref
);
124 static struct nfs_page
*nfs_page_find_request(struct page
*page
)
126 struct inode
*inode
= page
->mapping
->host
;
127 struct nfs_page
*req
= NULL
;
129 spin_lock(&inode
->i_lock
);
130 req
= nfs_page_find_request_locked(page
);
131 spin_unlock(&inode
->i_lock
);
135 /* Adjust the file length if we're writing beyond the end */
136 static void nfs_grow_file(struct page
*page
, unsigned int offset
, unsigned int count
)
138 struct inode
*inode
= page
->mapping
->host
;
142 spin_lock(&inode
->i_lock
);
143 i_size
= i_size_read(inode
);
144 end_index
= (i_size
- 1) >> PAGE_CACHE_SHIFT
;
145 if (i_size
> 0 && page
->index
< end_index
)
147 end
= ((loff_t
)page
->index
<< PAGE_CACHE_SHIFT
) + ((loff_t
)offset
+count
);
150 i_size_write(inode
, end
);
151 nfs_inc_stats(inode
, NFSIOS_EXTENDWRITE
);
153 spin_unlock(&inode
->i_lock
);
156 /* A writeback failed: mark the page as bad, and invalidate the page cache */
157 static void nfs_set_pageerror(struct page
*page
)
160 nfs_zap_mapping(page
->mapping
->host
, page
->mapping
);
163 /* We can set the PG_uptodate flag if we see that a write request
164 * covers the full page.
166 static void nfs_mark_uptodate(struct page
*page
, unsigned int base
, unsigned int count
)
168 if (PageUptodate(page
))
172 if (count
!= nfs_page_length(page
))
174 SetPageUptodate(page
);
177 static int wb_priority(struct writeback_control
*wbc
)
179 if (wbc
->for_reclaim
)
180 return FLUSH_HIGHPRI
| FLUSH_STABLE
;
181 if (wbc
->for_kupdate
|| wbc
->for_background
)
187 * NFS congestion control
190 int nfs_congestion_kb
;
192 #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10))
193 #define NFS_CONGESTION_OFF_THRESH \
194 (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2))
196 static int nfs_set_page_writeback(struct page
*page
)
198 int ret
= test_set_page_writeback(page
);
201 struct inode
*inode
= page
->mapping
->host
;
202 struct nfs_server
*nfss
= NFS_SERVER(inode
);
204 if (atomic_long_inc_return(&nfss
->writeback
) >
205 NFS_CONGESTION_ON_THRESH
) {
206 set_bdi_congested(&nfss
->backing_dev_info
,
213 static void nfs_end_page_writeback(struct page
*page
)
215 struct inode
*inode
= page
->mapping
->host
;
216 struct nfs_server
*nfss
= NFS_SERVER(inode
);
218 end_page_writeback(page
);
219 if (atomic_long_dec_return(&nfss
->writeback
) < NFS_CONGESTION_OFF_THRESH
)
220 clear_bdi_congested(&nfss
->backing_dev_info
, BLK_RW_ASYNC
);
223 static struct nfs_page
*nfs_find_and_lock_request(struct page
*page
)
225 struct inode
*inode
= page
->mapping
->host
;
226 struct nfs_page
*req
;
229 spin_lock(&inode
->i_lock
);
231 req
= nfs_page_find_request_locked(page
);
234 if (nfs_set_page_tag_locked(req
))
236 /* Note: If we hold the page lock, as is the case in nfs_writepage,
237 * then the call to nfs_set_page_tag_locked() will always
238 * succeed provided that someone hasn't already marked the
239 * request as dirty (in which case we don't care).
241 spin_unlock(&inode
->i_lock
);
242 ret
= nfs_wait_on_request(req
);
243 nfs_release_request(req
);
246 spin_lock(&inode
->i_lock
);
248 spin_unlock(&inode
->i_lock
);
253 * Find an associated nfs write request, and prepare to flush it out
254 * May return an error if the user signalled nfs_wait_on_request().
256 static int nfs_page_async_flush(struct nfs_pageio_descriptor
*pgio
,
259 struct nfs_page
*req
;
262 req
= nfs_find_and_lock_request(page
);
269 ret
= nfs_set_page_writeback(page
);
271 BUG_ON(test_bit(PG_CLEAN
, &req
->wb_flags
));
273 if (!nfs_pageio_add_request(pgio
, req
)) {
274 nfs_redirty_request(req
);
275 ret
= pgio
->pg_error
;
281 static int nfs_do_writepage(struct page
*page
, struct writeback_control
*wbc
, struct nfs_pageio_descriptor
*pgio
)
283 struct inode
*inode
= page
->mapping
->host
;
285 nfs_inc_stats(inode
, NFSIOS_VFSWRITEPAGE
);
286 nfs_add_stats(inode
, NFSIOS_WRITEPAGES
, 1);
288 nfs_pageio_cond_complete(pgio
, page
->index
);
289 return nfs_page_async_flush(pgio
, page
);
293 * Write an mmapped page to the server.
295 static int nfs_writepage_locked(struct page
*page
, struct writeback_control
*wbc
)
297 struct nfs_pageio_descriptor pgio
;
300 nfs_pageio_init_write(&pgio
, page
->mapping
->host
, wb_priority(wbc
));
301 err
= nfs_do_writepage(page
, wbc
, &pgio
);
302 nfs_pageio_complete(&pgio
);
305 if (pgio
.pg_error
< 0)
306 return pgio
.pg_error
;
310 int nfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
314 ret
= nfs_writepage_locked(page
, wbc
);
319 static int nfs_writepages_callback(struct page
*page
, struct writeback_control
*wbc
, void *data
)
323 ret
= nfs_do_writepage(page
, wbc
, data
);
328 int nfs_writepages(struct address_space
*mapping
, struct writeback_control
*wbc
)
330 struct inode
*inode
= mapping
->host
;
331 unsigned long *bitlock
= &NFS_I(inode
)->flags
;
332 struct nfs_pageio_descriptor pgio
;
335 /* Stop dirtying of new pages while we sync */
336 err
= wait_on_bit_lock(bitlock
, NFS_INO_FLUSHING
,
337 nfs_wait_bit_killable
, TASK_KILLABLE
);
341 nfs_inc_stats(inode
, NFSIOS_VFSWRITEPAGES
);
343 nfs_pageio_init_write(&pgio
, inode
, wb_priority(wbc
));
344 err
= write_cache_pages(mapping
, wbc
, nfs_writepages_callback
, &pgio
);
345 nfs_pageio_complete(&pgio
);
347 clear_bit_unlock(NFS_INO_FLUSHING
, bitlock
);
348 smp_mb__after_clear_bit();
349 wake_up_bit(bitlock
, NFS_INO_FLUSHING
);
362 * Insert a write request into an inode
364 static int nfs_inode_add_request(struct inode
*inode
, struct nfs_page
*req
)
366 struct nfs_inode
*nfsi
= NFS_I(inode
);
369 error
= radix_tree_preload(GFP_NOFS
);
373 /* Lock the request! */
374 nfs_lock_request_dontget(req
);
376 spin_lock(&inode
->i_lock
);
377 error
= radix_tree_insert(&nfsi
->nfs_page_tree
, req
->wb_index
, req
);
381 if (nfs_have_delegation(inode
, FMODE_WRITE
))
384 SetPagePrivate(req
->wb_page
);
385 set_page_private(req
->wb_page
, (unsigned long)req
);
387 kref_get(&req
->wb_kref
);
388 radix_tree_tag_set(&nfsi
->nfs_page_tree
, req
->wb_index
,
389 NFS_PAGE_TAG_LOCKED
);
390 spin_unlock(&inode
->i_lock
);
391 radix_tree_preload_end();
397 * Remove a write request from an inode
399 static void nfs_inode_remove_request(struct nfs_page
*req
)
401 struct inode
*inode
= req
->wb_context
->path
.dentry
->d_inode
;
402 struct nfs_inode
*nfsi
= NFS_I(inode
);
404 BUG_ON (!NFS_WBACK_BUSY(req
));
406 spin_lock(&inode
->i_lock
);
407 set_page_private(req
->wb_page
, 0);
408 ClearPagePrivate(req
->wb_page
);
409 radix_tree_delete(&nfsi
->nfs_page_tree
, req
->wb_index
);
412 spin_unlock(&inode
->i_lock
);
415 spin_unlock(&inode
->i_lock
);
416 nfs_clear_request(req
);
417 nfs_release_request(req
);
421 nfs_mark_request_dirty(struct nfs_page
*req
)
423 __set_page_dirty_nobuffers(req
->wb_page
);
426 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
428 * Add a request to the inode's commit list.
431 nfs_mark_request_commit(struct nfs_page
*req
)
433 struct inode
*inode
= req
->wb_context
->path
.dentry
->d_inode
;
434 struct nfs_inode
*nfsi
= NFS_I(inode
);
436 spin_lock(&inode
->i_lock
);
437 set_bit(PG_CLEAN
, &(req
)->wb_flags
);
438 radix_tree_tag_set(&nfsi
->nfs_page_tree
,
440 NFS_PAGE_TAG_COMMIT
);
442 spin_unlock(&inode
->i_lock
);
443 inc_zone_page_state(req
->wb_page
, NR_UNSTABLE_NFS
);
444 inc_bdi_stat(req
->wb_page
->mapping
->backing_dev_info
, BDI_RECLAIMABLE
);
445 __mark_inode_dirty(inode
, I_DIRTY_DATASYNC
);
449 nfs_clear_request_commit(struct nfs_page
*req
)
451 struct page
*page
= req
->wb_page
;
453 if (test_and_clear_bit(PG_CLEAN
, &(req
)->wb_flags
)) {
454 dec_zone_page_state(page
, NR_UNSTABLE_NFS
);
455 dec_bdi_stat(page
->mapping
->backing_dev_info
, BDI_RECLAIMABLE
);
462 int nfs_write_need_commit(struct nfs_write_data
*data
)
464 return data
->verf
.committed
!= NFS_FILE_SYNC
;
468 int nfs_reschedule_unstable_write(struct nfs_page
*req
)
470 if (test_and_clear_bit(PG_NEED_COMMIT
, &req
->wb_flags
)) {
471 nfs_mark_request_commit(req
);
474 if (test_and_clear_bit(PG_NEED_RESCHED
, &req
->wb_flags
)) {
475 nfs_mark_request_dirty(req
);
482 nfs_mark_request_commit(struct nfs_page
*req
)
487 nfs_clear_request_commit(struct nfs_page
*req
)
493 int nfs_write_need_commit(struct nfs_write_data
*data
)
499 int nfs_reschedule_unstable_write(struct nfs_page
*req
)
506 * Wait for a request to complete.
508 * Interruptible by fatal signals only.
510 static int nfs_wait_on_requests_locked(struct inode
*inode
, pgoff_t idx_start
, unsigned int npages
)
512 struct nfs_inode
*nfsi
= NFS_I(inode
);
513 struct nfs_page
*req
;
514 pgoff_t idx_end
, next
;
515 unsigned int res
= 0;
521 idx_end
= idx_start
+ npages
- 1;
524 while (radix_tree_gang_lookup_tag(&nfsi
->nfs_page_tree
, (void **)&req
, next
, 1, NFS_PAGE_TAG_LOCKED
)) {
525 if (req
->wb_index
> idx_end
)
528 next
= req
->wb_index
+ 1;
529 BUG_ON(!NFS_WBACK_BUSY(req
));
531 kref_get(&req
->wb_kref
);
532 spin_unlock(&inode
->i_lock
);
533 error
= nfs_wait_on_request(req
);
534 nfs_release_request(req
);
535 spin_lock(&inode
->i_lock
);
543 static void nfs_cancel_commit_list(struct list_head
*head
)
545 struct nfs_page
*req
;
547 while(!list_empty(head
)) {
548 req
= nfs_list_entry(head
->next
);
549 nfs_list_remove_request(req
);
550 nfs_clear_request_commit(req
);
551 nfs_inode_remove_request(req
);
552 nfs_unlock_request(req
);
556 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
558 nfs_need_commit(struct nfs_inode
*nfsi
)
560 return radix_tree_tagged(&nfsi
->nfs_page_tree
, NFS_PAGE_TAG_COMMIT
);
564 * nfs_scan_commit - Scan an inode for commit requests
565 * @inode: NFS inode to scan
566 * @dst: destination list
567 * @idx_start: lower bound of page->index to scan.
568 * @npages: idx_start + npages sets the upper bound to scan.
570 * Moves requests from the inode's 'commit' request list.
571 * The requests are *not* checked to ensure that they form a contiguous set.
574 nfs_scan_commit(struct inode
*inode
, struct list_head
*dst
, pgoff_t idx_start
, unsigned int npages
)
576 struct nfs_inode
*nfsi
= NFS_I(inode
);
579 if (!nfs_need_commit(nfsi
))
582 ret
= nfs_scan_list(nfsi
, dst
, idx_start
, npages
, NFS_PAGE_TAG_COMMIT
);
584 nfsi
->ncommit
-= ret
;
585 if (nfs_need_commit(NFS_I(inode
)))
586 __mark_inode_dirty(inode
, I_DIRTY_DATASYNC
);
590 static inline int nfs_need_commit(struct nfs_inode
*nfsi
)
595 static inline int nfs_scan_commit(struct inode
*inode
, struct list_head
*dst
, pgoff_t idx_start
, unsigned int npages
)
602 * Search for an existing write request, and attempt to update
603 * it to reflect a new dirty region on a given page.
605 * If the attempt fails, then the existing request is flushed out
608 static struct nfs_page
*nfs_try_to_update_request(struct inode
*inode
,
613 struct nfs_page
*req
;
618 if (!PagePrivate(page
))
621 end
= offset
+ bytes
;
622 spin_lock(&inode
->i_lock
);
625 req
= nfs_page_find_request_locked(page
);
629 rqend
= req
->wb_offset
+ req
->wb_bytes
;
631 * Tell the caller to flush out the request if
632 * the offsets are non-contiguous.
633 * Note: nfs_flush_incompatible() will already
634 * have flushed out requests having wrong owners.
637 || end
< req
->wb_offset
)
640 if (nfs_set_page_tag_locked(req
))
643 /* The request is locked, so wait and then retry */
644 spin_unlock(&inode
->i_lock
);
645 error
= nfs_wait_on_request(req
);
646 nfs_release_request(req
);
649 spin_lock(&inode
->i_lock
);
652 if (nfs_clear_request_commit(req
) &&
653 radix_tree_tag_clear(&NFS_I(inode
)->nfs_page_tree
,
654 req
->wb_index
, NFS_PAGE_TAG_COMMIT
) != NULL
)
655 NFS_I(inode
)->ncommit
--;
657 /* Okay, the request matches. Update the region */
658 if (offset
< req
->wb_offset
) {
659 req
->wb_offset
= offset
;
660 req
->wb_pgbase
= offset
;
663 req
->wb_bytes
= end
- req
->wb_offset
;
665 req
->wb_bytes
= rqend
- req
->wb_offset
;
667 spin_unlock(&inode
->i_lock
);
670 spin_unlock(&inode
->i_lock
);
671 nfs_release_request(req
);
672 error
= nfs_wb_page(inode
, page
);
674 return ERR_PTR(error
);
678 * Try to update an existing write request, or create one if there is none.
680 * Note: Should always be called with the Page Lock held to prevent races
681 * if we have to add a new request. Also assumes that the caller has
682 * already called nfs_flush_incompatible() if necessary.
684 static struct nfs_page
* nfs_setup_write_request(struct nfs_open_context
* ctx
,
685 struct page
*page
, unsigned int offset
, unsigned int bytes
)
687 struct inode
*inode
= page
->mapping
->host
;
688 struct nfs_page
*req
;
691 req
= nfs_try_to_update_request(inode
, page
, offset
, bytes
);
694 req
= nfs_create_request(ctx
, inode
, page
, offset
, bytes
);
697 error
= nfs_inode_add_request(inode
, req
);
699 nfs_release_request(req
);
700 req
= ERR_PTR(error
);
706 static int nfs_writepage_setup(struct nfs_open_context
*ctx
, struct page
*page
,
707 unsigned int offset
, unsigned int count
)
709 struct nfs_page
*req
;
711 req
= nfs_setup_write_request(ctx
, page
, offset
, count
);
714 /* Update file length */
715 nfs_grow_file(page
, offset
, count
);
716 nfs_mark_uptodate(page
, req
->wb_pgbase
, req
->wb_bytes
);
717 nfs_clear_page_tag_locked(req
);
721 int nfs_flush_incompatible(struct file
*file
, struct page
*page
)
723 struct nfs_open_context
*ctx
= nfs_file_open_context(file
);
724 struct nfs_page
*req
;
725 int do_flush
, status
;
727 * Look for a request corresponding to this page. If there
728 * is one, and it belongs to another file, we flush it out
729 * before we try to copy anything into the page. Do this
730 * due to the lack of an ACCESS-type call in NFSv2.
731 * Also do the same if we find a request from an existing
735 req
= nfs_page_find_request(page
);
738 do_flush
= req
->wb_page
!= page
|| req
->wb_context
!= ctx
;
739 nfs_release_request(req
);
742 status
= nfs_wb_page(page
->mapping
->host
, page
);
743 } while (status
== 0);
748 * If the page cache is marked as unsafe or invalid, then we can't rely on
749 * the PageUptodate() flag. In this case, we will need to turn off
750 * write optimisations that depend on the page contents being correct.
752 static int nfs_write_pageuptodate(struct page
*page
, struct inode
*inode
)
754 return PageUptodate(page
) &&
755 !(NFS_I(inode
)->cache_validity
& (NFS_INO_REVAL_PAGECACHE
|NFS_INO_INVALID_DATA
));
759 * Update and possibly write a cached page of an NFS file.
761 * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad
762 * things with a page scheduled for an RPC call (e.g. invalidate it).
764 int nfs_updatepage(struct file
*file
, struct page
*page
,
765 unsigned int offset
, unsigned int count
)
767 struct nfs_open_context
*ctx
= nfs_file_open_context(file
);
768 struct inode
*inode
= page
->mapping
->host
;
771 nfs_inc_stats(inode
, NFSIOS_VFSUPDATEPAGE
);
773 dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n",
774 file
->f_path
.dentry
->d_parent
->d_name
.name
,
775 file
->f_path
.dentry
->d_name
.name
, count
,
776 (long long)(page_offset(page
) + offset
));
778 /* If we're not using byte range locks, and we know the page
779 * is up to date, it may be more efficient to extend the write
780 * to cover the entire page in order to avoid fragmentation
783 if (nfs_write_pageuptodate(page
, inode
) &&
784 inode
->i_flock
== NULL
&&
785 !(file
->f_flags
& O_DSYNC
)) {
786 count
= max(count
+ offset
, nfs_page_length(page
));
790 status
= nfs_writepage_setup(ctx
, page
, offset
, count
);
792 nfs_set_pageerror(page
);
794 __set_page_dirty_nobuffers(page
);
796 dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n",
797 status
, (long long)i_size_read(inode
));
801 static void nfs_writepage_release(struct nfs_page
*req
)
804 if (PageError(req
->wb_page
) || !nfs_reschedule_unstable_write(req
)) {
805 nfs_end_page_writeback(req
->wb_page
);
806 nfs_inode_remove_request(req
);
808 nfs_end_page_writeback(req
->wb_page
);
809 nfs_clear_page_tag_locked(req
);
812 static int flush_task_priority(int how
)
814 switch (how
& (FLUSH_HIGHPRI
|FLUSH_LOWPRI
)) {
816 return RPC_PRIORITY_HIGH
;
818 return RPC_PRIORITY_LOW
;
820 return RPC_PRIORITY_NORMAL
;
824 * Set up the argument/result storage required for the RPC call.
826 static int nfs_write_rpcsetup(struct nfs_page
*req
,
827 struct nfs_write_data
*data
,
828 const struct rpc_call_ops
*call_ops
,
829 unsigned int count
, unsigned int offset
,
832 struct inode
*inode
= req
->wb_context
->path
.dentry
->d_inode
;
833 int flags
= (how
& FLUSH_SYNC
) ? 0 : RPC_TASK_ASYNC
;
834 int priority
= flush_task_priority(how
);
835 struct rpc_task
*task
;
836 struct rpc_message msg
= {
837 .rpc_argp
= &data
->args
,
838 .rpc_resp
= &data
->res
,
839 .rpc_cred
= req
->wb_context
->cred
,
841 struct rpc_task_setup task_setup_data
= {
842 .rpc_client
= NFS_CLIENT(inode
),
845 .callback_ops
= call_ops
,
846 .callback_data
= data
,
847 .workqueue
= nfsiod_workqueue
,
849 .priority
= priority
,
852 /* Set up the RPC argument and reply structs
853 * NB: take care not to mess about with data->commit et al. */
856 data
->inode
= inode
= req
->wb_context
->path
.dentry
->d_inode
;
857 data
->cred
= msg
.rpc_cred
;
859 data
->args
.fh
= NFS_FH(inode
);
860 data
->args
.offset
= req_offset(req
) + offset
;
861 data
->args
.pgbase
= req
->wb_pgbase
+ offset
;
862 data
->args
.pages
= data
->pagevec
;
863 data
->args
.count
= count
;
864 data
->args
.context
= get_nfs_open_context(req
->wb_context
);
865 data
->args
.stable
= NFS_UNSTABLE
;
866 if (how
& FLUSH_STABLE
) {
867 data
->args
.stable
= NFS_DATA_SYNC
;
868 if (!nfs_need_commit(NFS_I(inode
)))
869 data
->args
.stable
= NFS_FILE_SYNC
;
872 data
->res
.fattr
= &data
->fattr
;
873 data
->res
.count
= count
;
874 data
->res
.verf
= &data
->verf
;
875 nfs_fattr_init(&data
->fattr
);
877 /* Set up the initial task struct. */
878 NFS_PROTO(inode
)->write_setup(data
, &msg
);
880 dprintk("NFS: %5u initiated write call "
881 "(req %s/%lld, %u bytes @ offset %llu)\n",
884 (long long)NFS_FILEID(inode
),
886 (unsigned long long)data
->args
.offset
);
888 task
= rpc_run_task(&task_setup_data
);
890 return PTR_ERR(task
);
895 /* If a nfs_flush_* function fails, it should remove reqs from @head and
896 * call this on each, which will prepare them to be retried on next
897 * writeback using standard nfs.
899 static void nfs_redirty_request(struct nfs_page
*req
)
901 nfs_mark_request_dirty(req
);
902 nfs_end_page_writeback(req
->wb_page
);
903 nfs_clear_page_tag_locked(req
);
907 * Generate multiple small requests to write out a single
908 * contiguous dirty area on one page.
910 static int nfs_flush_multi(struct inode
*inode
, struct list_head
*head
, unsigned int npages
, size_t count
, int how
)
912 struct nfs_page
*req
= nfs_list_entry(head
->next
);
913 struct page
*page
= req
->wb_page
;
914 struct nfs_write_data
*data
;
915 size_t wsize
= NFS_SERVER(inode
)->wsize
, nbytes
;
921 nfs_list_remove_request(req
);
925 size_t len
= min(nbytes
, wsize
);
927 data
= nfs_writedata_alloc(1);
930 list_add(&data
->pages
, &list
);
933 } while (nbytes
!= 0);
934 atomic_set(&req
->wb_complete
, requests
);
936 ClearPageError(page
);
942 data
= list_entry(list
.next
, struct nfs_write_data
, pages
);
943 list_del_init(&data
->pages
);
945 data
->pagevec
[0] = page
;
949 ret2
= nfs_write_rpcsetup(req
, data
, &nfs_write_partial_ops
,
955 } while (nbytes
!= 0);
960 while (!list_empty(&list
)) {
961 data
= list_entry(list
.next
, struct nfs_write_data
, pages
);
962 list_del(&data
->pages
);
963 nfs_writedata_release(data
);
965 nfs_redirty_request(req
);
970 * Create an RPC task for the given write request and kick it.
971 * The page must have been locked by the caller.
973 * It may happen that the page we're passed is not marked dirty.
974 * This is the case if nfs_updatepage detects a conflicting request
975 * that has been written but not committed.
977 static int nfs_flush_one(struct inode
*inode
, struct list_head
*head
, unsigned int npages
, size_t count
, int how
)
979 struct nfs_page
*req
;
981 struct nfs_write_data
*data
;
983 data
= nfs_writedata_alloc(npages
);
987 pages
= data
->pagevec
;
988 while (!list_empty(head
)) {
989 req
= nfs_list_entry(head
->next
);
990 nfs_list_remove_request(req
);
991 nfs_list_add_request(req
, &data
->pages
);
992 ClearPageError(req
->wb_page
);
993 *pages
++ = req
->wb_page
;
995 req
= nfs_list_entry(data
->pages
.next
);
997 /* Set up the argument struct */
998 return nfs_write_rpcsetup(req
, data
, &nfs_write_full_ops
, count
, 0, how
);
1000 while (!list_empty(head
)) {
1001 req
= nfs_list_entry(head
->next
);
1002 nfs_list_remove_request(req
);
1003 nfs_redirty_request(req
);
1008 static void nfs_pageio_init_write(struct nfs_pageio_descriptor
*pgio
,
1009 struct inode
*inode
, int ioflags
)
1011 size_t wsize
= NFS_SERVER(inode
)->wsize
;
1013 if (wsize
< PAGE_CACHE_SIZE
)
1014 nfs_pageio_init(pgio
, inode
, nfs_flush_multi
, wsize
, ioflags
);
1016 nfs_pageio_init(pgio
, inode
, nfs_flush_one
, wsize
, ioflags
);
1020 * Handle a write reply that flushed part of a page.
1022 static void nfs_writeback_done_partial(struct rpc_task
*task
, void *calldata
)
1024 struct nfs_write_data
*data
= calldata
;
1026 dprintk("NFS: %5u write(%s/%lld %d@%lld)",
1028 data
->req
->wb_context
->path
.dentry
->d_inode
->i_sb
->s_id
,
1030 NFS_FILEID(data
->req
->wb_context
->path
.dentry
->d_inode
),
1031 data
->req
->wb_bytes
, (long long)req_offset(data
->req
));
1033 nfs_writeback_done(task
, data
);
1036 static void nfs_writeback_release_partial(void *calldata
)
1038 struct nfs_write_data
*data
= calldata
;
1039 struct nfs_page
*req
= data
->req
;
1040 struct page
*page
= req
->wb_page
;
1041 int status
= data
->task
.tk_status
;
1044 nfs_set_pageerror(page
);
1045 nfs_context_set_write_error(req
->wb_context
, status
);
1046 dprintk(", error = %d\n", status
);
1050 if (nfs_write_need_commit(data
)) {
1051 struct inode
*inode
= page
->mapping
->host
;
1053 spin_lock(&inode
->i_lock
);
1054 if (test_bit(PG_NEED_RESCHED
, &req
->wb_flags
)) {
1055 /* Do nothing we need to resend the writes */
1056 } else if (!test_and_set_bit(PG_NEED_COMMIT
, &req
->wb_flags
)) {
1057 memcpy(&req
->wb_verf
, &data
->verf
, sizeof(req
->wb_verf
));
1058 dprintk(" defer commit\n");
1059 } else if (memcmp(&req
->wb_verf
, &data
->verf
, sizeof(req
->wb_verf
))) {
1060 set_bit(PG_NEED_RESCHED
, &req
->wb_flags
);
1061 clear_bit(PG_NEED_COMMIT
, &req
->wb_flags
);
1062 dprintk(" server reboot detected\n");
1064 spin_unlock(&inode
->i_lock
);
1069 if (atomic_dec_and_test(&req
->wb_complete
))
1070 nfs_writepage_release(req
);
1071 nfs_writedata_release(calldata
);
1074 #if defined(CONFIG_NFS_V4_1)
1075 void nfs_write_prepare(struct rpc_task
*task
, void *calldata
)
1077 struct nfs_write_data
*data
= calldata
;
1078 struct nfs_client
*clp
= (NFS_SERVER(data
->inode
))->nfs_client
;
1080 if (nfs4_setup_sequence(clp
, &data
->args
.seq_args
,
1081 &data
->res
.seq_res
, 1, task
))
1083 rpc_call_start(task
);
1085 #endif /* CONFIG_NFS_V4_1 */
1087 static const struct rpc_call_ops nfs_write_partial_ops
= {
1088 #if defined(CONFIG_NFS_V4_1)
1089 .rpc_call_prepare
= nfs_write_prepare
,
1090 #endif /* CONFIG_NFS_V4_1 */
1091 .rpc_call_done
= nfs_writeback_done_partial
,
1092 .rpc_release
= nfs_writeback_release_partial
,
1096 * Handle a write reply that flushes a whole page.
1098 * FIXME: There is an inherent race with invalidate_inode_pages and
1099 * writebacks since the page->count is kept > 1 for as long
1100 * as the page has a write request pending.
1102 static void nfs_writeback_done_full(struct rpc_task
*task
, void *calldata
)
1104 struct nfs_write_data
*data
= calldata
;
1106 nfs_writeback_done(task
, data
);
1109 static void nfs_writeback_release_full(void *calldata
)
1111 struct nfs_write_data
*data
= calldata
;
1112 int status
= data
->task
.tk_status
;
1114 /* Update attributes as result of writeback. */
1115 while (!list_empty(&data
->pages
)) {
1116 struct nfs_page
*req
= nfs_list_entry(data
->pages
.next
);
1117 struct page
*page
= req
->wb_page
;
1119 nfs_list_remove_request(req
);
1121 dprintk("NFS: %5u write (%s/%lld %d@%lld)",
1123 req
->wb_context
->path
.dentry
->d_inode
->i_sb
->s_id
,
1124 (long long)NFS_FILEID(req
->wb_context
->path
.dentry
->d_inode
),
1126 (long long)req_offset(req
));
1129 nfs_set_pageerror(page
);
1130 nfs_context_set_write_error(req
->wb_context
, status
);
1131 dprintk(", error = %d\n", status
);
1132 goto remove_request
;
1135 if (nfs_write_need_commit(data
)) {
1136 memcpy(&req
->wb_verf
, &data
->verf
, sizeof(req
->wb_verf
));
1137 nfs_mark_request_commit(req
);
1138 nfs_end_page_writeback(page
);
1139 dprintk(" marked for commit\n");
1144 nfs_end_page_writeback(page
);
1145 nfs_inode_remove_request(req
);
1147 nfs_clear_page_tag_locked(req
);
1149 nfs_writedata_release(calldata
);
1152 static const struct rpc_call_ops nfs_write_full_ops
= {
1153 #if defined(CONFIG_NFS_V4_1)
1154 .rpc_call_prepare
= nfs_write_prepare
,
1155 #endif /* CONFIG_NFS_V4_1 */
1156 .rpc_call_done
= nfs_writeback_done_full
,
1157 .rpc_release
= nfs_writeback_release_full
,
1162 * This function is called when the WRITE call is complete.
1164 int nfs_writeback_done(struct rpc_task
*task
, struct nfs_write_data
*data
)
1166 struct nfs_writeargs
*argp
= &data
->args
;
1167 struct nfs_writeres
*resp
= &data
->res
;
1168 struct nfs_server
*server
= NFS_SERVER(data
->inode
);
1171 dprintk("NFS: %5u nfs_writeback_done (status %d)\n",
1172 task
->tk_pid
, task
->tk_status
);
1175 * ->write_done will attempt to use post-op attributes to detect
1176 * conflicting writes by other clients. A strict interpretation
1177 * of close-to-open would allow us to continue caching even if
1178 * another writer had changed the file, but some applications
1179 * depend on tighter cache coherency when writing.
1181 status
= NFS_PROTO(data
->inode
)->write_done(task
, data
);
1184 nfs_add_stats(data
->inode
, NFSIOS_SERVERWRITTENBYTES
, resp
->count
);
1186 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1187 if (resp
->verf
->committed
< argp
->stable
&& task
->tk_status
>= 0) {
1188 /* We tried a write call, but the server did not
1189 * commit data to stable storage even though we
1191 * Note: There is a known bug in Tru64 < 5.0 in which
1192 * the server reports NFS_DATA_SYNC, but performs
1193 * NFS_FILE_SYNC. We therefore implement this checking
1194 * as a dprintk() in order to avoid filling syslog.
1196 static unsigned long complain
;
1198 if (time_before(complain
, jiffies
)) {
1199 dprintk("NFS: faulty NFS server %s:"
1200 " (committed = %d) != (stable = %d)\n",
1201 server
->nfs_client
->cl_hostname
,
1202 resp
->verf
->committed
, argp
->stable
);
1203 complain
= jiffies
+ 300 * HZ
;
1207 /* Is this a short write? */
1208 if (task
->tk_status
>= 0 && resp
->count
< argp
->count
) {
1209 static unsigned long complain
;
1211 nfs_inc_stats(data
->inode
, NFSIOS_SHORTWRITE
);
1213 /* Has the server at least made some progress? */
1214 if (resp
->count
!= 0) {
1215 /* Was this an NFSv2 write or an NFSv3 stable write? */
1216 if (resp
->verf
->committed
!= NFS_UNSTABLE
) {
1217 /* Resend from where the server left off */
1218 argp
->offset
+= resp
->count
;
1219 argp
->pgbase
+= resp
->count
;
1220 argp
->count
-= resp
->count
;
1222 /* Resend as a stable write in order to avoid
1223 * headaches in the case of a server crash.
1225 argp
->stable
= NFS_FILE_SYNC
;
1227 nfs_restart_rpc(task
, server
->nfs_client
);
1230 if (time_before(complain
, jiffies
)) {
1232 "NFS: Server wrote zero bytes, expected %u.\n",
1234 complain
= jiffies
+ 300 * HZ
;
1236 /* Can't do anything about it except throw an error. */
1237 task
->tk_status
= -EIO
;
1243 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1244 static void nfs_commitdata_release(void *data
)
1246 struct nfs_write_data
*wdata
= data
;
1248 put_nfs_open_context(wdata
->args
.context
);
1249 nfs_commit_free(wdata
);
1253 * Set up the argument/result storage required for the RPC call.
1255 static int nfs_commit_rpcsetup(struct list_head
*head
,
1256 struct nfs_write_data
*data
,
1259 struct nfs_page
*first
= nfs_list_entry(head
->next
);
1260 struct inode
*inode
= first
->wb_context
->path
.dentry
->d_inode
;
1261 int flags
= (how
& FLUSH_SYNC
) ? 0 : RPC_TASK_ASYNC
;
1262 int priority
= flush_task_priority(how
);
1263 struct rpc_task
*task
;
1264 struct rpc_message msg
= {
1265 .rpc_argp
= &data
->args
,
1266 .rpc_resp
= &data
->res
,
1267 .rpc_cred
= first
->wb_context
->cred
,
1269 struct rpc_task_setup task_setup_data
= {
1270 .task
= &data
->task
,
1271 .rpc_client
= NFS_CLIENT(inode
),
1272 .rpc_message
= &msg
,
1273 .callback_ops
= &nfs_commit_ops
,
1274 .callback_data
= data
,
1275 .workqueue
= nfsiod_workqueue
,
1277 .priority
= priority
,
1280 /* Set up the RPC argument and reply structs
1281 * NB: take care not to mess about with data->commit et al. */
1283 list_splice_init(head
, &data
->pages
);
1285 data
->inode
= inode
;
1286 data
->cred
= msg
.rpc_cred
;
1288 data
->args
.fh
= NFS_FH(data
->inode
);
1289 /* Note: we always request a commit of the entire inode */
1290 data
->args
.offset
= 0;
1291 data
->args
.count
= 0;
1292 data
->args
.context
= get_nfs_open_context(first
->wb_context
);
1293 data
->res
.count
= 0;
1294 data
->res
.fattr
= &data
->fattr
;
1295 data
->res
.verf
= &data
->verf
;
1296 nfs_fattr_init(&data
->fattr
);
1298 /* Set up the initial task struct. */
1299 NFS_PROTO(inode
)->commit_setup(data
, &msg
);
1301 dprintk("NFS: %5u initiated commit call\n", data
->task
.tk_pid
);
1303 task
= rpc_run_task(&task_setup_data
);
1305 return PTR_ERR(task
);
1311 * Commit dirty pages
1314 nfs_commit_list(struct inode
*inode
, struct list_head
*head
, int how
)
1316 struct nfs_write_data
*data
;
1317 struct nfs_page
*req
;
1319 data
= nfs_commitdata_alloc();
1324 /* Set up the argument struct */
1325 return nfs_commit_rpcsetup(head
, data
, how
);
1327 while (!list_empty(head
)) {
1328 req
= nfs_list_entry(head
->next
);
1329 nfs_list_remove_request(req
);
1330 nfs_mark_request_commit(req
);
1331 dec_zone_page_state(req
->wb_page
, NR_UNSTABLE_NFS
);
1332 dec_bdi_stat(req
->wb_page
->mapping
->backing_dev_info
,
1334 nfs_clear_page_tag_locked(req
);
1340 * COMMIT call returned
1342 static void nfs_commit_done(struct rpc_task
*task
, void *calldata
)
1344 struct nfs_write_data
*data
= calldata
;
1346 dprintk("NFS: %5u nfs_commit_done (status %d)\n",
1347 task
->tk_pid
, task
->tk_status
);
1349 /* Call the NFS version-specific code */
1350 if (NFS_PROTO(data
->inode
)->commit_done(task
, data
) != 0)
1354 static void nfs_commit_release(void *calldata
)
1356 struct nfs_write_data
*data
= calldata
;
1357 struct nfs_page
*req
;
1358 int status
= data
->task
.tk_status
;
1360 while (!list_empty(&data
->pages
)) {
1361 req
= nfs_list_entry(data
->pages
.next
);
1362 nfs_list_remove_request(req
);
1363 nfs_clear_request_commit(req
);
1365 dprintk("NFS: commit (%s/%lld %d@%lld)",
1366 req
->wb_context
->path
.dentry
->d_inode
->i_sb
->s_id
,
1367 (long long)NFS_FILEID(req
->wb_context
->path
.dentry
->d_inode
),
1369 (long long)req_offset(req
));
1371 nfs_context_set_write_error(req
->wb_context
, status
);
1372 nfs_inode_remove_request(req
);
1373 dprintk(", error = %d\n", status
);
1377 /* Okay, COMMIT succeeded, apparently. Check the verifier
1378 * returned by the server against all stored verfs. */
1379 if (!memcmp(req
->wb_verf
.verifier
, data
->verf
.verifier
, sizeof(data
->verf
.verifier
))) {
1380 /* We have a match */
1381 nfs_inode_remove_request(req
);
1385 /* We have a mismatch. Write the page again */
1386 dprintk(" mismatch\n");
1387 nfs_mark_request_dirty(req
);
1389 nfs_clear_page_tag_locked(req
);
1391 nfs_commitdata_release(calldata
);
1394 static const struct rpc_call_ops nfs_commit_ops
= {
1395 #if defined(CONFIG_NFS_V4_1)
1396 .rpc_call_prepare
= nfs_write_prepare
,
1397 #endif /* CONFIG_NFS_V4_1 */
1398 .rpc_call_done
= nfs_commit_done
,
1399 .rpc_release
= nfs_commit_release
,
1402 static int nfs_commit_inode(struct inode
*inode
, int how
)
1407 spin_lock(&inode
->i_lock
);
1408 res
= nfs_scan_commit(inode
, &head
, 0, 0);
1409 spin_unlock(&inode
->i_lock
);
1411 int error
= nfs_commit_list(inode
, &head
, how
);
1418 static int nfs_commit_unstable_pages(struct inode
*inode
, struct writeback_control
*wbc
)
1420 struct nfs_inode
*nfsi
= NFS_I(inode
);
1421 int flags
= FLUSH_SYNC
;
1424 /* Don't commit yet if this is a non-blocking flush and there are
1425 * lots of outstanding writes for this mapping.
1427 if (wbc
->sync_mode
== WB_SYNC_NONE
&&
1428 nfsi
->ncommit
<= (nfsi
->npages
>> 1))
1429 goto out_mark_dirty
;
1431 if (wbc
->nonblocking
|| wbc
->for_background
)
1433 ret
= nfs_commit_inode(inode
, flags
);
1435 if (wbc
->sync_mode
== WB_SYNC_NONE
) {
1436 if (ret
< wbc
->nr_to_write
)
1437 wbc
->nr_to_write
-= ret
;
1439 wbc
->nr_to_write
= 0;
1444 __mark_inode_dirty(inode
, I_DIRTY_DATASYNC
);
1448 static inline int nfs_commit_list(struct inode
*inode
, struct list_head
*head
, int how
)
1453 static int nfs_commit_unstable_pages(struct inode
*inode
, struct writeback_control
*wbc
)
1459 int nfs_write_inode(struct inode
*inode
, struct writeback_control
*wbc
)
1461 return nfs_commit_unstable_pages(inode
, wbc
);
1464 long nfs_sync_mapping_wait(struct address_space
*mapping
, struct writeback_control
*wbc
, int how
)
1466 struct inode
*inode
= mapping
->host
;
1467 pgoff_t idx_start
, idx_end
;
1468 unsigned int npages
= 0;
1470 int nocommit
= how
& FLUSH_NOCOMMIT
;
1474 if (wbc
->range_cyclic
)
1477 idx_start
= wbc
->range_start
>> PAGE_CACHE_SHIFT
;
1478 idx_end
= wbc
->range_end
>> PAGE_CACHE_SHIFT
;
1479 if (idx_end
> idx_start
) {
1480 pgoff_t l_npages
= 1 + idx_end
- idx_start
;
1482 if (sizeof(npages
) != sizeof(l_npages
) &&
1483 (pgoff_t
)npages
!= l_npages
)
1487 how
&= ~FLUSH_NOCOMMIT
;
1488 spin_lock(&inode
->i_lock
);
1490 ret
= nfs_wait_on_requests_locked(inode
, idx_start
, npages
);
1495 pages
= nfs_scan_commit(inode
, &head
, idx_start
, npages
);
1498 if (how
& FLUSH_INVALIDATE
) {
1499 spin_unlock(&inode
->i_lock
);
1500 nfs_cancel_commit_list(&head
);
1502 spin_lock(&inode
->i_lock
);
1505 pages
+= nfs_scan_commit(inode
, &head
, 0, 0);
1506 spin_unlock(&inode
->i_lock
);
1507 ret
= nfs_commit_list(inode
, &head
, how
);
1508 spin_lock(&inode
->i_lock
);
1511 spin_unlock(&inode
->i_lock
);
1515 static int __nfs_write_mapping(struct address_space
*mapping
, struct writeback_control
*wbc
, int how
)
1519 ret
= nfs_writepages(mapping
, wbc
);
1522 ret
= nfs_sync_mapping_wait(mapping
, wbc
, how
);
1527 __mark_inode_dirty(mapping
->host
, I_DIRTY_PAGES
);
1531 /* Two pass sync: first using WB_SYNC_NONE, then WB_SYNC_ALL */
1532 static int nfs_write_mapping(struct address_space
*mapping
, int how
)
1534 struct writeback_control wbc
= {
1535 .bdi
= mapping
->backing_dev_info
,
1536 .sync_mode
= WB_SYNC_ALL
,
1537 .nr_to_write
= LONG_MAX
,
1539 .range_end
= LLONG_MAX
,
1542 return __nfs_write_mapping(mapping
, &wbc
, how
);
1546 * flush the inode to disk.
1548 int nfs_wb_all(struct inode
*inode
)
1550 return nfs_write_mapping(inode
->i_mapping
, 0);
1553 int nfs_wb_nocommit(struct inode
*inode
)
1555 return nfs_write_mapping(inode
->i_mapping
, FLUSH_NOCOMMIT
);
1558 int nfs_wb_page_cancel(struct inode
*inode
, struct page
*page
)
1560 struct nfs_page
*req
;
1561 loff_t range_start
= page_offset(page
);
1562 loff_t range_end
= range_start
+ (loff_t
)(PAGE_CACHE_SIZE
- 1);
1563 struct writeback_control wbc
= {
1564 .bdi
= page
->mapping
->backing_dev_info
,
1565 .sync_mode
= WB_SYNC_ALL
,
1566 .nr_to_write
= LONG_MAX
,
1567 .range_start
= range_start
,
1568 .range_end
= range_end
,
1572 BUG_ON(!PageLocked(page
));
1574 req
= nfs_page_find_request(page
);
1577 if (test_bit(PG_CLEAN
, &req
->wb_flags
)) {
1578 nfs_release_request(req
);
1581 if (nfs_lock_request_dontget(req
)) {
1582 nfs_inode_remove_request(req
);
1584 * In case nfs_inode_remove_request has marked the
1585 * page as being dirty
1587 cancel_dirty_page(page
, PAGE_CACHE_SIZE
);
1588 nfs_unlock_request(req
);
1591 ret
= nfs_wait_on_request(req
);
1592 nfs_release_request(req
);
1596 if (!PagePrivate(page
))
1598 ret
= nfs_sync_mapping_wait(page
->mapping
, &wbc
, FLUSH_INVALIDATE
);
1603 static int nfs_wb_page_priority(struct inode
*inode
, struct page
*page
,
1606 loff_t range_start
= page_offset(page
);
1607 loff_t range_end
= range_start
+ (loff_t
)(PAGE_CACHE_SIZE
- 1);
1608 struct writeback_control wbc
= {
1609 .bdi
= page
->mapping
->backing_dev_info
,
1610 .sync_mode
= WB_SYNC_ALL
,
1611 .nr_to_write
= LONG_MAX
,
1612 .range_start
= range_start
,
1613 .range_end
= range_end
,
1618 if (clear_page_dirty_for_io(page
)) {
1619 ret
= nfs_writepage_locked(page
, &wbc
);
1622 } else if (!PagePrivate(page
))
1624 ret
= nfs_sync_mapping_wait(page
->mapping
, &wbc
, how
);
1627 } while (PagePrivate(page
));
1630 __mark_inode_dirty(inode
, I_DIRTY_PAGES
);
1635 * Write back all requests on one page - we do this before reading it.
1637 int nfs_wb_page(struct inode
*inode
, struct page
* page
)
1639 return nfs_wb_page_priority(inode
, page
, FLUSH_STABLE
);
1642 #ifdef CONFIG_MIGRATION
1643 int nfs_migrate_page(struct address_space
*mapping
, struct page
*newpage
,
1646 struct nfs_page
*req
;
1649 nfs_fscache_release_page(page
, GFP_KERNEL
);
1651 req
= nfs_find_and_lock_request(page
);
1656 ret
= migrate_page(mapping
, newpage
, page
);
1661 page_cache_get(newpage
);
1662 spin_lock(&mapping
->host
->i_lock
);
1663 req
->wb_page
= newpage
;
1664 SetPagePrivate(newpage
);
1665 set_page_private(newpage
, (unsigned long)req
);
1666 ClearPagePrivate(page
);
1667 set_page_private(page
, 0);
1668 spin_unlock(&mapping
->host
->i_lock
);
1669 page_cache_release(page
);
1671 nfs_clear_page_tag_locked(req
);
1677 int __init
nfs_init_writepagecache(void)
1679 nfs_wdata_cachep
= kmem_cache_create("nfs_write_data",
1680 sizeof(struct nfs_write_data
),
1681 0, SLAB_HWCACHE_ALIGN
,
1683 if (nfs_wdata_cachep
== NULL
)
1686 nfs_wdata_mempool
= mempool_create_slab_pool(MIN_POOL_WRITE
,
1688 if (nfs_wdata_mempool
== NULL
)
1691 nfs_commit_mempool
= mempool_create_slab_pool(MIN_POOL_COMMIT
,
1693 if (nfs_commit_mempool
== NULL
)
1697 * NFS congestion size, scale with available memory.
1709 * This allows larger machines to have larger/more transfers.
1710 * Limit the default to 256M
1712 nfs_congestion_kb
= (16*int_sqrt(totalram_pages
)) << (PAGE_SHIFT
-10);
1713 if (nfs_congestion_kb
> 256*1024)
1714 nfs_congestion_kb
= 256*1024;
1719 void nfs_destroy_writepagecache(void)
1721 mempool_destroy(nfs_commit_mempool
);
1722 mempool_destroy(nfs_wdata_mempool
);
1723 kmem_cache_destroy(nfs_wdata_cachep
);