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
;
588 static inline int nfs_need_commit(struct nfs_inode
*nfsi
)
593 static inline int nfs_scan_commit(struct inode
*inode
, struct list_head
*dst
, pgoff_t idx_start
, unsigned int npages
)
600 * Search for an existing write request, and attempt to update
601 * it to reflect a new dirty region on a given page.
603 * If the attempt fails, then the existing request is flushed out
606 static struct nfs_page
*nfs_try_to_update_request(struct inode
*inode
,
611 struct nfs_page
*req
;
616 if (!PagePrivate(page
))
619 end
= offset
+ bytes
;
620 spin_lock(&inode
->i_lock
);
623 req
= nfs_page_find_request_locked(page
);
627 rqend
= req
->wb_offset
+ req
->wb_bytes
;
629 * Tell the caller to flush out the request if
630 * the offsets are non-contiguous.
631 * Note: nfs_flush_incompatible() will already
632 * have flushed out requests having wrong owners.
635 || end
< req
->wb_offset
)
638 if (nfs_set_page_tag_locked(req
))
641 /* The request is locked, so wait and then retry */
642 spin_unlock(&inode
->i_lock
);
643 error
= nfs_wait_on_request(req
);
644 nfs_release_request(req
);
647 spin_lock(&inode
->i_lock
);
650 if (nfs_clear_request_commit(req
) &&
651 radix_tree_tag_clear(&NFS_I(inode
)->nfs_page_tree
,
652 req
->wb_index
, NFS_PAGE_TAG_COMMIT
) != NULL
)
653 NFS_I(inode
)->ncommit
--;
655 /* Okay, the request matches. Update the region */
656 if (offset
< req
->wb_offset
) {
657 req
->wb_offset
= offset
;
658 req
->wb_pgbase
= offset
;
661 req
->wb_bytes
= end
- req
->wb_offset
;
663 req
->wb_bytes
= rqend
- req
->wb_offset
;
665 spin_unlock(&inode
->i_lock
);
668 spin_unlock(&inode
->i_lock
);
669 nfs_release_request(req
);
670 error
= nfs_wb_page(inode
, page
);
672 return ERR_PTR(error
);
676 * Try to update an existing write request, or create one if there is none.
678 * Note: Should always be called with the Page Lock held to prevent races
679 * if we have to add a new request. Also assumes that the caller has
680 * already called nfs_flush_incompatible() if necessary.
682 static struct nfs_page
* nfs_setup_write_request(struct nfs_open_context
* ctx
,
683 struct page
*page
, unsigned int offset
, unsigned int bytes
)
685 struct inode
*inode
= page
->mapping
->host
;
686 struct nfs_page
*req
;
689 req
= nfs_try_to_update_request(inode
, page
, offset
, bytes
);
692 req
= nfs_create_request(ctx
, inode
, page
, offset
, bytes
);
695 error
= nfs_inode_add_request(inode
, req
);
697 nfs_release_request(req
);
698 req
= ERR_PTR(error
);
704 static int nfs_writepage_setup(struct nfs_open_context
*ctx
, struct page
*page
,
705 unsigned int offset
, unsigned int count
)
707 struct nfs_page
*req
;
709 req
= nfs_setup_write_request(ctx
, page
, offset
, count
);
712 /* Update file length */
713 nfs_grow_file(page
, offset
, count
);
714 nfs_mark_uptodate(page
, req
->wb_pgbase
, req
->wb_bytes
);
715 nfs_clear_page_tag_locked(req
);
719 int nfs_flush_incompatible(struct file
*file
, struct page
*page
)
721 struct nfs_open_context
*ctx
= nfs_file_open_context(file
);
722 struct nfs_page
*req
;
723 int do_flush
, status
;
725 * Look for a request corresponding to this page. If there
726 * is one, and it belongs to another file, we flush it out
727 * before we try to copy anything into the page. Do this
728 * due to the lack of an ACCESS-type call in NFSv2.
729 * Also do the same if we find a request from an existing
733 req
= nfs_page_find_request(page
);
736 do_flush
= req
->wb_page
!= page
|| req
->wb_context
!= ctx
;
737 nfs_release_request(req
);
740 status
= nfs_wb_page(page
->mapping
->host
, page
);
741 } while (status
== 0);
746 * If the page cache is marked as unsafe or invalid, then we can't rely on
747 * the PageUptodate() flag. In this case, we will need to turn off
748 * write optimisations that depend on the page contents being correct.
750 static int nfs_write_pageuptodate(struct page
*page
, struct inode
*inode
)
752 return PageUptodate(page
) &&
753 !(NFS_I(inode
)->cache_validity
& (NFS_INO_REVAL_PAGECACHE
|NFS_INO_INVALID_DATA
));
757 * Update and possibly write a cached page of an NFS file.
759 * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad
760 * things with a page scheduled for an RPC call (e.g. invalidate it).
762 int nfs_updatepage(struct file
*file
, struct page
*page
,
763 unsigned int offset
, unsigned int count
)
765 struct nfs_open_context
*ctx
= nfs_file_open_context(file
);
766 struct inode
*inode
= page
->mapping
->host
;
769 nfs_inc_stats(inode
, NFSIOS_VFSUPDATEPAGE
);
771 dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n",
772 file
->f_path
.dentry
->d_parent
->d_name
.name
,
773 file
->f_path
.dentry
->d_name
.name
, count
,
774 (long long)(page_offset(page
) + offset
));
776 /* If we're not using byte range locks, and we know the page
777 * is up to date, it may be more efficient to extend the write
778 * to cover the entire page in order to avoid fragmentation
781 if (nfs_write_pageuptodate(page
, inode
) &&
782 inode
->i_flock
== NULL
&&
783 !(file
->f_flags
& O_DSYNC
)) {
784 count
= max(count
+ offset
, nfs_page_length(page
));
788 status
= nfs_writepage_setup(ctx
, page
, offset
, count
);
790 nfs_set_pageerror(page
);
792 __set_page_dirty_nobuffers(page
);
794 dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n",
795 status
, (long long)i_size_read(inode
));
799 static void nfs_writepage_release(struct nfs_page
*req
)
802 if (PageError(req
->wb_page
) || !nfs_reschedule_unstable_write(req
)) {
803 nfs_end_page_writeback(req
->wb_page
);
804 nfs_inode_remove_request(req
);
806 nfs_end_page_writeback(req
->wb_page
);
807 nfs_clear_page_tag_locked(req
);
810 static int flush_task_priority(int how
)
812 switch (how
& (FLUSH_HIGHPRI
|FLUSH_LOWPRI
)) {
814 return RPC_PRIORITY_HIGH
;
816 return RPC_PRIORITY_LOW
;
818 return RPC_PRIORITY_NORMAL
;
822 * Set up the argument/result storage required for the RPC call.
824 static int nfs_write_rpcsetup(struct nfs_page
*req
,
825 struct nfs_write_data
*data
,
826 const struct rpc_call_ops
*call_ops
,
827 unsigned int count
, unsigned int offset
,
830 struct inode
*inode
= req
->wb_context
->path
.dentry
->d_inode
;
831 int flags
= (how
& FLUSH_SYNC
) ? 0 : RPC_TASK_ASYNC
;
832 int priority
= flush_task_priority(how
);
833 struct rpc_task
*task
;
834 struct rpc_message msg
= {
835 .rpc_argp
= &data
->args
,
836 .rpc_resp
= &data
->res
,
837 .rpc_cred
= req
->wb_context
->cred
,
839 struct rpc_task_setup task_setup_data
= {
840 .rpc_client
= NFS_CLIENT(inode
),
843 .callback_ops
= call_ops
,
844 .callback_data
= data
,
845 .workqueue
= nfsiod_workqueue
,
847 .priority
= priority
,
850 /* Set up the RPC argument and reply structs
851 * NB: take care not to mess about with data->commit et al. */
854 data
->inode
= inode
= req
->wb_context
->path
.dentry
->d_inode
;
855 data
->cred
= msg
.rpc_cred
;
857 data
->args
.fh
= NFS_FH(inode
);
858 data
->args
.offset
= req_offset(req
) + offset
;
859 data
->args
.pgbase
= req
->wb_pgbase
+ offset
;
860 data
->args
.pages
= data
->pagevec
;
861 data
->args
.count
= count
;
862 data
->args
.context
= get_nfs_open_context(req
->wb_context
);
863 data
->args
.stable
= NFS_UNSTABLE
;
864 if (how
& FLUSH_STABLE
) {
865 data
->args
.stable
= NFS_DATA_SYNC
;
866 if (!nfs_need_commit(NFS_I(inode
)))
867 data
->args
.stable
= NFS_FILE_SYNC
;
870 data
->res
.fattr
= &data
->fattr
;
871 data
->res
.count
= count
;
872 data
->res
.verf
= &data
->verf
;
873 nfs_fattr_init(&data
->fattr
);
875 /* Set up the initial task struct. */
876 NFS_PROTO(inode
)->write_setup(data
, &msg
);
878 dprintk("NFS: %5u initiated write call "
879 "(req %s/%lld, %u bytes @ offset %llu)\n",
882 (long long)NFS_FILEID(inode
),
884 (unsigned long long)data
->args
.offset
);
886 task
= rpc_run_task(&task_setup_data
);
888 return PTR_ERR(task
);
893 /* If a nfs_flush_* function fails, it should remove reqs from @head and
894 * call this on each, which will prepare them to be retried on next
895 * writeback using standard nfs.
897 static void nfs_redirty_request(struct nfs_page
*req
)
899 nfs_mark_request_dirty(req
);
900 nfs_end_page_writeback(req
->wb_page
);
901 nfs_clear_page_tag_locked(req
);
905 * Generate multiple small requests to write out a single
906 * contiguous dirty area on one page.
908 static int nfs_flush_multi(struct inode
*inode
, struct list_head
*head
, unsigned int npages
, size_t count
, int how
)
910 struct nfs_page
*req
= nfs_list_entry(head
->next
);
911 struct page
*page
= req
->wb_page
;
912 struct nfs_write_data
*data
;
913 size_t wsize
= NFS_SERVER(inode
)->wsize
, nbytes
;
919 nfs_list_remove_request(req
);
923 size_t len
= min(nbytes
, wsize
);
925 data
= nfs_writedata_alloc(1);
928 list_add(&data
->pages
, &list
);
931 } while (nbytes
!= 0);
932 atomic_set(&req
->wb_complete
, requests
);
934 ClearPageError(page
);
940 data
= list_entry(list
.next
, struct nfs_write_data
, pages
);
941 list_del_init(&data
->pages
);
943 data
->pagevec
[0] = page
;
947 ret2
= nfs_write_rpcsetup(req
, data
, &nfs_write_partial_ops
,
953 } while (nbytes
!= 0);
958 while (!list_empty(&list
)) {
959 data
= list_entry(list
.next
, struct nfs_write_data
, pages
);
960 list_del(&data
->pages
);
961 nfs_writedata_release(data
);
963 nfs_redirty_request(req
);
968 * Create an RPC task for the given write request and kick it.
969 * The page must have been locked by the caller.
971 * It may happen that the page we're passed is not marked dirty.
972 * This is the case if nfs_updatepage detects a conflicting request
973 * that has been written but not committed.
975 static int nfs_flush_one(struct inode
*inode
, struct list_head
*head
, unsigned int npages
, size_t count
, int how
)
977 struct nfs_page
*req
;
979 struct nfs_write_data
*data
;
981 data
= nfs_writedata_alloc(npages
);
985 pages
= data
->pagevec
;
986 while (!list_empty(head
)) {
987 req
= nfs_list_entry(head
->next
);
988 nfs_list_remove_request(req
);
989 nfs_list_add_request(req
, &data
->pages
);
990 ClearPageError(req
->wb_page
);
991 *pages
++ = req
->wb_page
;
993 req
= nfs_list_entry(data
->pages
.next
);
995 /* Set up the argument struct */
996 return nfs_write_rpcsetup(req
, data
, &nfs_write_full_ops
, count
, 0, how
);
998 while (!list_empty(head
)) {
999 req
= nfs_list_entry(head
->next
);
1000 nfs_list_remove_request(req
);
1001 nfs_redirty_request(req
);
1006 static void nfs_pageio_init_write(struct nfs_pageio_descriptor
*pgio
,
1007 struct inode
*inode
, int ioflags
)
1009 size_t wsize
= NFS_SERVER(inode
)->wsize
;
1011 if (wsize
< PAGE_CACHE_SIZE
)
1012 nfs_pageio_init(pgio
, inode
, nfs_flush_multi
, wsize
, ioflags
);
1014 nfs_pageio_init(pgio
, inode
, nfs_flush_one
, wsize
, ioflags
);
1018 * Handle a write reply that flushed part of a page.
1020 static void nfs_writeback_done_partial(struct rpc_task
*task
, void *calldata
)
1022 struct nfs_write_data
*data
= calldata
;
1024 dprintk("NFS: %5u write(%s/%lld %d@%lld)",
1026 data
->req
->wb_context
->path
.dentry
->d_inode
->i_sb
->s_id
,
1028 NFS_FILEID(data
->req
->wb_context
->path
.dentry
->d_inode
),
1029 data
->req
->wb_bytes
, (long long)req_offset(data
->req
));
1031 nfs_writeback_done(task
, data
);
1034 static void nfs_writeback_release_partial(void *calldata
)
1036 struct nfs_write_data
*data
= calldata
;
1037 struct nfs_page
*req
= data
->req
;
1038 struct page
*page
= req
->wb_page
;
1039 int status
= data
->task
.tk_status
;
1042 nfs_set_pageerror(page
);
1043 nfs_context_set_write_error(req
->wb_context
, status
);
1044 dprintk(", error = %d\n", status
);
1048 if (nfs_write_need_commit(data
)) {
1049 struct inode
*inode
= page
->mapping
->host
;
1051 spin_lock(&inode
->i_lock
);
1052 if (test_bit(PG_NEED_RESCHED
, &req
->wb_flags
)) {
1053 /* Do nothing we need to resend the writes */
1054 } else if (!test_and_set_bit(PG_NEED_COMMIT
, &req
->wb_flags
)) {
1055 memcpy(&req
->wb_verf
, &data
->verf
, sizeof(req
->wb_verf
));
1056 dprintk(" defer commit\n");
1057 } else if (memcmp(&req
->wb_verf
, &data
->verf
, sizeof(req
->wb_verf
))) {
1058 set_bit(PG_NEED_RESCHED
, &req
->wb_flags
);
1059 clear_bit(PG_NEED_COMMIT
, &req
->wb_flags
);
1060 dprintk(" server reboot detected\n");
1062 spin_unlock(&inode
->i_lock
);
1067 if (atomic_dec_and_test(&req
->wb_complete
))
1068 nfs_writepage_release(req
);
1069 nfs_writedata_release(calldata
);
1072 #if defined(CONFIG_NFS_V4_1)
1073 void nfs_write_prepare(struct rpc_task
*task
, void *calldata
)
1075 struct nfs_write_data
*data
= calldata
;
1076 struct nfs_client
*clp
= (NFS_SERVER(data
->inode
))->nfs_client
;
1078 if (nfs4_setup_sequence(clp
, &data
->args
.seq_args
,
1079 &data
->res
.seq_res
, 1, task
))
1081 rpc_call_start(task
);
1083 #endif /* CONFIG_NFS_V4_1 */
1085 static const struct rpc_call_ops nfs_write_partial_ops
= {
1086 #if defined(CONFIG_NFS_V4_1)
1087 .rpc_call_prepare
= nfs_write_prepare
,
1088 #endif /* CONFIG_NFS_V4_1 */
1089 .rpc_call_done
= nfs_writeback_done_partial
,
1090 .rpc_release
= nfs_writeback_release_partial
,
1094 * Handle a write reply that flushes a whole page.
1096 * FIXME: There is an inherent race with invalidate_inode_pages and
1097 * writebacks since the page->count is kept > 1 for as long
1098 * as the page has a write request pending.
1100 static void nfs_writeback_done_full(struct rpc_task
*task
, void *calldata
)
1102 struct nfs_write_data
*data
= calldata
;
1104 nfs_writeback_done(task
, data
);
1107 static void nfs_writeback_release_full(void *calldata
)
1109 struct nfs_write_data
*data
= calldata
;
1110 int status
= data
->task
.tk_status
;
1112 /* Update attributes as result of writeback. */
1113 while (!list_empty(&data
->pages
)) {
1114 struct nfs_page
*req
= nfs_list_entry(data
->pages
.next
);
1115 struct page
*page
= req
->wb_page
;
1117 nfs_list_remove_request(req
);
1119 dprintk("NFS: %5u write (%s/%lld %d@%lld)",
1121 req
->wb_context
->path
.dentry
->d_inode
->i_sb
->s_id
,
1122 (long long)NFS_FILEID(req
->wb_context
->path
.dentry
->d_inode
),
1124 (long long)req_offset(req
));
1127 nfs_set_pageerror(page
);
1128 nfs_context_set_write_error(req
->wb_context
, status
);
1129 dprintk(", error = %d\n", status
);
1130 goto remove_request
;
1133 if (nfs_write_need_commit(data
)) {
1134 memcpy(&req
->wb_verf
, &data
->verf
, sizeof(req
->wb_verf
));
1135 nfs_mark_request_commit(req
);
1136 nfs_end_page_writeback(page
);
1137 dprintk(" marked for commit\n");
1142 nfs_end_page_writeback(page
);
1143 nfs_inode_remove_request(req
);
1145 nfs_clear_page_tag_locked(req
);
1147 nfs_writedata_release(calldata
);
1150 static const struct rpc_call_ops nfs_write_full_ops
= {
1151 #if defined(CONFIG_NFS_V4_1)
1152 .rpc_call_prepare
= nfs_write_prepare
,
1153 #endif /* CONFIG_NFS_V4_1 */
1154 .rpc_call_done
= nfs_writeback_done_full
,
1155 .rpc_release
= nfs_writeback_release_full
,
1160 * This function is called when the WRITE call is complete.
1162 int nfs_writeback_done(struct rpc_task
*task
, struct nfs_write_data
*data
)
1164 struct nfs_writeargs
*argp
= &data
->args
;
1165 struct nfs_writeres
*resp
= &data
->res
;
1166 struct nfs_server
*server
= NFS_SERVER(data
->inode
);
1169 dprintk("NFS: %5u nfs_writeback_done (status %d)\n",
1170 task
->tk_pid
, task
->tk_status
);
1173 * ->write_done will attempt to use post-op attributes to detect
1174 * conflicting writes by other clients. A strict interpretation
1175 * of close-to-open would allow us to continue caching even if
1176 * another writer had changed the file, but some applications
1177 * depend on tighter cache coherency when writing.
1179 status
= NFS_PROTO(data
->inode
)->write_done(task
, data
);
1182 nfs_add_stats(data
->inode
, NFSIOS_SERVERWRITTENBYTES
, resp
->count
);
1184 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1185 if (resp
->verf
->committed
< argp
->stable
&& task
->tk_status
>= 0) {
1186 /* We tried a write call, but the server did not
1187 * commit data to stable storage even though we
1189 * Note: There is a known bug in Tru64 < 5.0 in which
1190 * the server reports NFS_DATA_SYNC, but performs
1191 * NFS_FILE_SYNC. We therefore implement this checking
1192 * as a dprintk() in order to avoid filling syslog.
1194 static unsigned long complain
;
1196 if (time_before(complain
, jiffies
)) {
1197 dprintk("NFS: faulty NFS server %s:"
1198 " (committed = %d) != (stable = %d)\n",
1199 server
->nfs_client
->cl_hostname
,
1200 resp
->verf
->committed
, argp
->stable
);
1201 complain
= jiffies
+ 300 * HZ
;
1205 /* Is this a short write? */
1206 if (task
->tk_status
>= 0 && resp
->count
< argp
->count
) {
1207 static unsigned long complain
;
1209 nfs_inc_stats(data
->inode
, NFSIOS_SHORTWRITE
);
1211 /* Has the server at least made some progress? */
1212 if (resp
->count
!= 0) {
1213 /* Was this an NFSv2 write or an NFSv3 stable write? */
1214 if (resp
->verf
->committed
!= NFS_UNSTABLE
) {
1215 /* Resend from where the server left off */
1216 argp
->offset
+= resp
->count
;
1217 argp
->pgbase
+= resp
->count
;
1218 argp
->count
-= resp
->count
;
1220 /* Resend as a stable write in order to avoid
1221 * headaches in the case of a server crash.
1223 argp
->stable
= NFS_FILE_SYNC
;
1225 nfs_restart_rpc(task
, server
->nfs_client
);
1228 if (time_before(complain
, jiffies
)) {
1230 "NFS: Server wrote zero bytes, expected %u.\n",
1232 complain
= jiffies
+ 300 * HZ
;
1234 /* Can't do anything about it except throw an error. */
1235 task
->tk_status
= -EIO
;
1241 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1242 static void nfs_commitdata_release(void *data
)
1244 struct nfs_write_data
*wdata
= data
;
1246 put_nfs_open_context(wdata
->args
.context
);
1247 nfs_commit_free(wdata
);
1251 * Set up the argument/result storage required for the RPC call.
1253 static int nfs_commit_rpcsetup(struct list_head
*head
,
1254 struct nfs_write_data
*data
,
1257 struct nfs_page
*first
= nfs_list_entry(head
->next
);
1258 struct inode
*inode
= first
->wb_context
->path
.dentry
->d_inode
;
1259 int flags
= (how
& FLUSH_SYNC
) ? 0 : RPC_TASK_ASYNC
;
1260 int priority
= flush_task_priority(how
);
1261 struct rpc_task
*task
;
1262 struct rpc_message msg
= {
1263 .rpc_argp
= &data
->args
,
1264 .rpc_resp
= &data
->res
,
1265 .rpc_cred
= first
->wb_context
->cred
,
1267 struct rpc_task_setup task_setup_data
= {
1268 .task
= &data
->task
,
1269 .rpc_client
= NFS_CLIENT(inode
),
1270 .rpc_message
= &msg
,
1271 .callback_ops
= &nfs_commit_ops
,
1272 .callback_data
= data
,
1273 .workqueue
= nfsiod_workqueue
,
1275 .priority
= priority
,
1278 /* Set up the RPC argument and reply structs
1279 * NB: take care not to mess about with data->commit et al. */
1281 list_splice_init(head
, &data
->pages
);
1283 data
->inode
= inode
;
1284 data
->cred
= msg
.rpc_cred
;
1286 data
->args
.fh
= NFS_FH(data
->inode
);
1287 /* Note: we always request a commit of the entire inode */
1288 data
->args
.offset
= 0;
1289 data
->args
.count
= 0;
1290 data
->args
.context
= get_nfs_open_context(first
->wb_context
);
1291 data
->res
.count
= 0;
1292 data
->res
.fattr
= &data
->fattr
;
1293 data
->res
.verf
= &data
->verf
;
1294 nfs_fattr_init(&data
->fattr
);
1296 /* Set up the initial task struct. */
1297 NFS_PROTO(inode
)->commit_setup(data
, &msg
);
1299 dprintk("NFS: %5u initiated commit call\n", data
->task
.tk_pid
);
1301 task
= rpc_run_task(&task_setup_data
);
1303 return PTR_ERR(task
);
1309 * Commit dirty pages
1312 nfs_commit_list(struct inode
*inode
, struct list_head
*head
, int how
)
1314 struct nfs_write_data
*data
;
1315 struct nfs_page
*req
;
1317 data
= nfs_commitdata_alloc();
1322 /* Set up the argument struct */
1323 return nfs_commit_rpcsetup(head
, data
, how
);
1325 while (!list_empty(head
)) {
1326 req
= nfs_list_entry(head
->next
);
1327 nfs_list_remove_request(req
);
1328 nfs_mark_request_commit(req
);
1329 dec_zone_page_state(req
->wb_page
, NR_UNSTABLE_NFS
);
1330 dec_bdi_stat(req
->wb_page
->mapping
->backing_dev_info
,
1332 nfs_clear_page_tag_locked(req
);
1338 * COMMIT call returned
1340 static void nfs_commit_done(struct rpc_task
*task
, void *calldata
)
1342 struct nfs_write_data
*data
= calldata
;
1344 dprintk("NFS: %5u nfs_commit_done (status %d)\n",
1345 task
->tk_pid
, task
->tk_status
);
1347 /* Call the NFS version-specific code */
1348 if (NFS_PROTO(data
->inode
)->commit_done(task
, data
) != 0)
1352 static void nfs_commit_release(void *calldata
)
1354 struct nfs_write_data
*data
= calldata
;
1355 struct nfs_page
*req
;
1356 int status
= data
->task
.tk_status
;
1358 while (!list_empty(&data
->pages
)) {
1359 req
= nfs_list_entry(data
->pages
.next
);
1360 nfs_list_remove_request(req
);
1361 nfs_clear_request_commit(req
);
1363 dprintk("NFS: commit (%s/%lld %d@%lld)",
1364 req
->wb_context
->path
.dentry
->d_inode
->i_sb
->s_id
,
1365 (long long)NFS_FILEID(req
->wb_context
->path
.dentry
->d_inode
),
1367 (long long)req_offset(req
));
1369 nfs_context_set_write_error(req
->wb_context
, status
);
1370 nfs_inode_remove_request(req
);
1371 dprintk(", error = %d\n", status
);
1375 /* Okay, COMMIT succeeded, apparently. Check the verifier
1376 * returned by the server against all stored verfs. */
1377 if (!memcmp(req
->wb_verf
.verifier
, data
->verf
.verifier
, sizeof(data
->verf
.verifier
))) {
1378 /* We have a match */
1379 nfs_inode_remove_request(req
);
1383 /* We have a mismatch. Write the page again */
1384 dprintk(" mismatch\n");
1385 nfs_mark_request_dirty(req
);
1387 nfs_clear_page_tag_locked(req
);
1389 nfs_commitdata_release(calldata
);
1392 static const struct rpc_call_ops nfs_commit_ops
= {
1393 #if defined(CONFIG_NFS_V4_1)
1394 .rpc_call_prepare
= nfs_write_prepare
,
1395 #endif /* CONFIG_NFS_V4_1 */
1396 .rpc_call_done
= nfs_commit_done
,
1397 .rpc_release
= nfs_commit_release
,
1400 static int nfs_commit_inode(struct inode
*inode
, int how
)
1405 spin_lock(&inode
->i_lock
);
1406 res
= nfs_scan_commit(inode
, &head
, 0, 0);
1407 spin_unlock(&inode
->i_lock
);
1409 int error
= nfs_commit_list(inode
, &head
, how
);
1416 static int nfs_commit_unstable_pages(struct inode
*inode
, struct writeback_control
*wbc
)
1420 ret
= nfs_commit_inode(inode
,
1421 wbc
->sync_mode
== WB_SYNC_ALL
? FLUSH_SYNC
: 0);
1424 __mark_inode_dirty(inode
, I_DIRTY_DATASYNC
);
1428 static inline int nfs_commit_list(struct inode
*inode
, struct list_head
*head
, int how
)
1433 static int nfs_commit_unstable_pages(struct inode
*inode
, struct writeback_control
*wbc
)
1439 int nfs_write_inode(struct inode
*inode
, struct writeback_control
*wbc
)
1441 return nfs_commit_unstable_pages(inode
, wbc
);
1444 long nfs_sync_mapping_wait(struct address_space
*mapping
, struct writeback_control
*wbc
, int how
)
1446 struct inode
*inode
= mapping
->host
;
1447 pgoff_t idx_start
, idx_end
;
1448 unsigned int npages
= 0;
1450 int nocommit
= how
& FLUSH_NOCOMMIT
;
1454 if (wbc
->range_cyclic
)
1457 idx_start
= wbc
->range_start
>> PAGE_CACHE_SHIFT
;
1458 idx_end
= wbc
->range_end
>> PAGE_CACHE_SHIFT
;
1459 if (idx_end
> idx_start
) {
1460 pgoff_t l_npages
= 1 + idx_end
- idx_start
;
1462 if (sizeof(npages
) != sizeof(l_npages
) &&
1463 (pgoff_t
)npages
!= l_npages
)
1467 how
&= ~FLUSH_NOCOMMIT
;
1468 spin_lock(&inode
->i_lock
);
1470 ret
= nfs_wait_on_requests_locked(inode
, idx_start
, npages
);
1475 pages
= nfs_scan_commit(inode
, &head
, idx_start
, npages
);
1478 if (how
& FLUSH_INVALIDATE
) {
1479 spin_unlock(&inode
->i_lock
);
1480 nfs_cancel_commit_list(&head
);
1482 spin_lock(&inode
->i_lock
);
1485 pages
+= nfs_scan_commit(inode
, &head
, 0, 0);
1486 spin_unlock(&inode
->i_lock
);
1487 ret
= nfs_commit_list(inode
, &head
, how
);
1488 spin_lock(&inode
->i_lock
);
1491 spin_unlock(&inode
->i_lock
);
1495 static int __nfs_write_mapping(struct address_space
*mapping
, struct writeback_control
*wbc
, int how
)
1499 ret
= nfs_writepages(mapping
, wbc
);
1502 ret
= nfs_sync_mapping_wait(mapping
, wbc
, how
);
1507 __mark_inode_dirty(mapping
->host
, I_DIRTY_PAGES
);
1511 /* Two pass sync: first using WB_SYNC_NONE, then WB_SYNC_ALL */
1512 static int nfs_write_mapping(struct address_space
*mapping
, int how
)
1514 struct writeback_control wbc
= {
1515 .bdi
= mapping
->backing_dev_info
,
1516 .sync_mode
= WB_SYNC_ALL
,
1517 .nr_to_write
= LONG_MAX
,
1519 .range_end
= LLONG_MAX
,
1522 return __nfs_write_mapping(mapping
, &wbc
, how
);
1526 * flush the inode to disk.
1528 int nfs_wb_all(struct inode
*inode
)
1530 return nfs_write_mapping(inode
->i_mapping
, 0);
1533 int nfs_wb_nocommit(struct inode
*inode
)
1535 return nfs_write_mapping(inode
->i_mapping
, FLUSH_NOCOMMIT
);
1538 int nfs_wb_page_cancel(struct inode
*inode
, struct page
*page
)
1540 struct nfs_page
*req
;
1541 loff_t range_start
= page_offset(page
);
1542 loff_t range_end
= range_start
+ (loff_t
)(PAGE_CACHE_SIZE
- 1);
1543 struct writeback_control wbc
= {
1544 .bdi
= page
->mapping
->backing_dev_info
,
1545 .sync_mode
= WB_SYNC_ALL
,
1546 .nr_to_write
= LONG_MAX
,
1547 .range_start
= range_start
,
1548 .range_end
= range_end
,
1552 BUG_ON(!PageLocked(page
));
1554 req
= nfs_page_find_request(page
);
1557 if (test_bit(PG_CLEAN
, &req
->wb_flags
)) {
1558 nfs_release_request(req
);
1561 if (nfs_lock_request_dontget(req
)) {
1562 nfs_inode_remove_request(req
);
1564 * In case nfs_inode_remove_request has marked the
1565 * page as being dirty
1567 cancel_dirty_page(page
, PAGE_CACHE_SIZE
);
1568 nfs_unlock_request(req
);
1571 ret
= nfs_wait_on_request(req
);
1572 nfs_release_request(req
);
1576 if (!PagePrivate(page
))
1578 ret
= nfs_sync_mapping_wait(page
->mapping
, &wbc
, FLUSH_INVALIDATE
);
1583 static int nfs_wb_page_priority(struct inode
*inode
, struct page
*page
,
1586 loff_t range_start
= page_offset(page
);
1587 loff_t range_end
= range_start
+ (loff_t
)(PAGE_CACHE_SIZE
- 1);
1588 struct writeback_control wbc
= {
1589 .bdi
= page
->mapping
->backing_dev_info
,
1590 .sync_mode
= WB_SYNC_ALL
,
1591 .nr_to_write
= LONG_MAX
,
1592 .range_start
= range_start
,
1593 .range_end
= range_end
,
1598 if (clear_page_dirty_for_io(page
)) {
1599 ret
= nfs_writepage_locked(page
, &wbc
);
1602 } else if (!PagePrivate(page
))
1604 ret
= nfs_sync_mapping_wait(page
->mapping
, &wbc
, how
);
1607 } while (PagePrivate(page
));
1610 __mark_inode_dirty(inode
, I_DIRTY_PAGES
);
1615 * Write back all requests on one page - we do this before reading it.
1617 int nfs_wb_page(struct inode
*inode
, struct page
* page
)
1619 return nfs_wb_page_priority(inode
, page
, FLUSH_STABLE
);
1622 #ifdef CONFIG_MIGRATION
1623 int nfs_migrate_page(struct address_space
*mapping
, struct page
*newpage
,
1626 struct nfs_page
*req
;
1629 nfs_fscache_release_page(page
, GFP_KERNEL
);
1631 req
= nfs_find_and_lock_request(page
);
1636 ret
= migrate_page(mapping
, newpage
, page
);
1641 page_cache_get(newpage
);
1642 spin_lock(&mapping
->host
->i_lock
);
1643 req
->wb_page
= newpage
;
1644 SetPagePrivate(newpage
);
1645 set_page_private(newpage
, (unsigned long)req
);
1646 ClearPagePrivate(page
);
1647 set_page_private(page
, 0);
1648 spin_unlock(&mapping
->host
->i_lock
);
1649 page_cache_release(page
);
1651 nfs_clear_page_tag_locked(req
);
1657 int __init
nfs_init_writepagecache(void)
1659 nfs_wdata_cachep
= kmem_cache_create("nfs_write_data",
1660 sizeof(struct nfs_write_data
),
1661 0, SLAB_HWCACHE_ALIGN
,
1663 if (nfs_wdata_cachep
== NULL
)
1666 nfs_wdata_mempool
= mempool_create_slab_pool(MIN_POOL_WRITE
,
1668 if (nfs_wdata_mempool
== NULL
)
1671 nfs_commit_mempool
= mempool_create_slab_pool(MIN_POOL_COMMIT
,
1673 if (nfs_commit_mempool
== NULL
)
1677 * NFS congestion size, scale with available memory.
1689 * This allows larger machines to have larger/more transfers.
1690 * Limit the default to 256M
1692 nfs_congestion_kb
= (16*int_sqrt(totalram_pages
)) << (PAGE_SHIFT
-10);
1693 if (nfs_congestion_kb
> 256*1024)
1694 nfs_congestion_kb
= 256*1024;
1699 void nfs_destroy_writepagecache(void)
1701 mempool_destroy(nfs_commit_mempool
);
1702 mempool_destroy(nfs_wdata_mempool
);
1703 kmem_cache_destroy(nfs_wdata_cachep
);