4 * Writing file data over NFS.
6 * We do it like this: When a (user) process wishes to write data to an
7 * NFS file, a write request is allocated that contains the RPC task data
8 * plus some info on the page to be written, and added to the inode's
9 * write chain. If the process writes past the end of the page, an async
10 * RPC call to write the page is scheduled immediately; otherwise, the call
11 * is delayed for a few seconds.
13 * Just like readahead, no async I/O is performed if wsize < PAGE_SIZE.
15 * Write requests are kept on the inode's writeback list. Each entry in
16 * that list references the page (portion) to be written. When the
17 * cache timeout has expired, the RPC task is woken up, and tries to
18 * lock the page. As soon as it manages to do so, the request is moved
19 * from the writeback list to the writelock list.
21 * Note: we must make sure never to confuse the inode passed in the
22 * write_page request with the one in page->inode. As far as I understand
23 * it, these are different when doing a swap-out.
25 * To understand everything that goes on here and in the NFS read code,
26 * one should be aware that a page is locked in exactly one of the following
29 * - A write request is in progress.
30 * - A user process is in generic_file_write/nfs_update_page
31 * - A user process is in generic_file_read
33 * Also note that because of the way pages are invalidated in
34 * nfs_revalidate_inode, the following assertions hold:
36 * - If a page is dirty, there will be no read requests (a page will
37 * not be re-read unless invalidated by nfs_revalidate_inode).
38 * - If the page is not uptodate, there will be no pending write
39 * requests, and no process will be in nfs_update_page.
41 * FIXME: Interaction with the vmscan routines is not optimal yet.
42 * Either vmscan must be made nfs-savvy, or we need a different page
43 * reclaim concept that supports something like FS-independent
44 * buffer_heads with a b_ops-> field.
46 * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de>
49 #include <linux/types.h>
50 #include <linux/slab.h>
52 #include <linux/pagemap.h>
53 #include <linux/file.h>
54 #include <linux/writeback.h>
56 #include <linux/sunrpc/clnt.h>
57 #include <linux/nfs_fs.h>
58 #include <linux/nfs_mount.h>
59 #include <linux/nfs_page.h>
60 #include <linux/backing-dev.h>
62 #include <asm/uaccess.h>
63 #include <linux/smp_lock.h>
65 #include "delegation.h"
68 #define NFSDBG_FACILITY NFSDBG_PAGECACHE
70 #define MIN_POOL_WRITE (32)
71 #define MIN_POOL_COMMIT (4)
74 * Local function declarations
76 static struct nfs_page
* nfs_update_request(struct nfs_open_context
*,
79 unsigned int, unsigned int);
80 static int nfs_wait_on_write_congestion(struct address_space
*, int);
81 static int nfs_wait_on_requests(struct inode
*, unsigned long, unsigned int);
82 static int nfs_flush_inode(struct inode
*inode
, unsigned long idx_start
,
83 unsigned int npages
, int how
);
84 static const struct rpc_call_ops nfs_write_partial_ops
;
85 static const struct rpc_call_ops nfs_write_full_ops
;
86 static const struct rpc_call_ops nfs_commit_ops
;
88 static kmem_cache_t
*nfs_wdata_cachep
;
89 static mempool_t
*nfs_wdata_mempool
;
90 static mempool_t
*nfs_commit_mempool
;
92 static DECLARE_WAIT_QUEUE_HEAD(nfs_write_congestion
);
94 struct nfs_write_data
*nfs_commit_alloc(void)
96 struct nfs_write_data
*p
= mempool_alloc(nfs_commit_mempool
, SLAB_NOFS
);
99 memset(p
, 0, sizeof(*p
));
100 INIT_LIST_HEAD(&p
->pages
);
105 void nfs_commit_free(struct nfs_write_data
*p
)
107 if (p
&& (p
->pagevec
!= &p
->page_array
[0]))
109 mempool_free(p
, nfs_commit_mempool
);
112 struct nfs_write_data
*nfs_writedata_alloc(size_t len
)
114 unsigned int pagecount
= (len
+ PAGE_SIZE
- 1) >> PAGE_SHIFT
;
115 struct nfs_write_data
*p
= mempool_alloc(nfs_wdata_mempool
, SLAB_NOFS
);
118 memset(p
, 0, sizeof(*p
));
119 INIT_LIST_HEAD(&p
->pages
);
120 p
->npages
= pagecount
;
121 if (pagecount
<= ARRAY_SIZE(p
->page_array
))
122 p
->pagevec
= p
->page_array
;
124 p
->pagevec
= kcalloc(pagecount
, sizeof(struct page
*), GFP_NOFS
);
126 mempool_free(p
, nfs_wdata_mempool
);
134 static void nfs_writedata_free(struct nfs_write_data
*p
)
136 if (p
&& (p
->pagevec
!= &p
->page_array
[0]))
138 mempool_free(p
, nfs_wdata_mempool
);
141 void nfs_writedata_release(void *wdata
)
143 nfs_writedata_free(wdata
);
146 /* Adjust the file length if we're writing beyond the end */
147 static void nfs_grow_file(struct page
*page
, unsigned int offset
, unsigned int count
)
149 #if 0 // mask by Victor Yu. 02-12-2007
150 struct inode
*inode
= page
->mapping
->host
;
152 struct inode
*inode
= page
->u
.xx
.mapping
->host
;
154 loff_t end
, i_size
= i_size_read(inode
);
155 unsigned long end_index
= (i_size
- 1) >> PAGE_CACHE_SHIFT
;
157 if (i_size
> 0 && page
->index
< end_index
)
159 end
= ((loff_t
)page
->index
<< PAGE_CACHE_SHIFT
) + ((loff_t
)offset
+count
);
162 nfs_inc_stats(inode
, NFSIOS_EXTENDWRITE
);
163 i_size_write(inode
, end
);
166 /* We can set the PG_uptodate flag if we see that a write request
167 * covers the full page.
169 static void nfs_mark_uptodate(struct page
*page
, unsigned int base
, unsigned int count
)
173 if (PageUptodate(page
))
177 if (count
== PAGE_CACHE_SIZE
) {
178 SetPageUptodate(page
);
182 #if 0 // mask by Victor Yu. 02-12-2007
183 end_offs
= i_size_read(page
->mapping
->host
) - 1;
185 end_offs
= i_size_read(page
->u
.xx
.mapping
->host
) - 1;
189 /* Is this the last page? */
190 if (page
->index
!= (unsigned long)(end_offs
>> PAGE_CACHE_SHIFT
))
192 /* This is the last page: set PG_uptodate if we cover the entire
193 * extent of the data, then zero the rest of the page.
195 if (count
== (unsigned int)(end_offs
& (PAGE_CACHE_SIZE
- 1)) + 1) {
196 memclear_highpage_flush(page
, count
, PAGE_CACHE_SIZE
- count
);
197 SetPageUptodate(page
);
202 * Write a page synchronously.
203 * Offset is the data offset within the page.
205 static int nfs_writepage_sync(struct nfs_open_context
*ctx
, struct inode
*inode
,
206 struct page
*page
, unsigned int offset
, unsigned int count
,
209 unsigned int wsize
= NFS_SERVER(inode
)->wsize
;
210 int result
, written
= 0;
211 struct nfs_write_data
*wdata
;
213 wdata
= nfs_writedata_alloc(wsize
);
218 wdata
->cred
= ctx
->cred
;
219 wdata
->inode
= inode
;
220 wdata
->args
.fh
= NFS_FH(inode
);
221 wdata
->args
.context
= ctx
;
222 wdata
->args
.pages
= &page
;
223 wdata
->args
.stable
= NFS_FILE_SYNC
;
224 wdata
->args
.pgbase
= offset
;
225 wdata
->args
.count
= wsize
;
226 wdata
->res
.fattr
= &wdata
->fattr
;
227 wdata
->res
.verf
= &wdata
->verf
;
229 dprintk("NFS: nfs_writepage_sync(%s/%Ld %d@%Ld)\n",
231 (long long)NFS_FILEID(inode
),
232 count
, (long long)(page_offset(page
) + offset
));
234 set_page_writeback(page
);
235 nfs_begin_data_update(inode
);
238 wdata
->args
.count
= count
;
239 wdata
->args
.offset
= page_offset(page
) + wdata
->args
.pgbase
;
241 result
= NFS_PROTO(inode
)->write(wdata
);
244 /* Must mark the page invalid after I/O error */
245 ClearPageUptodate(page
);
248 if (result
< wdata
->args
.count
)
249 printk(KERN_WARNING
"NFS: short write, count=%u, result=%d\n",
250 wdata
->args
.count
, result
);
252 wdata
->args
.offset
+= result
;
253 wdata
->args
.pgbase
+= result
;
256 nfs_add_stats(inode
, NFSIOS_SERVERWRITTENBYTES
, result
);
258 /* Update file length */
259 nfs_grow_file(page
, offset
, written
);
260 /* Set the PG_uptodate flag? */
261 nfs_mark_uptodate(page
, offset
, written
);
264 ClearPageError(page
);
267 nfs_end_data_update(inode
);
268 end_page_writeback(page
);
269 nfs_writedata_free(wdata
);
270 return written
? written
: result
;
273 static int nfs_writepage_async(struct nfs_open_context
*ctx
,
274 struct inode
*inode
, struct page
*page
,
275 unsigned int offset
, unsigned int count
)
277 struct nfs_page
*req
;
279 req
= nfs_update_request(ctx
, inode
, page
, offset
, count
);
282 /* Update file length */
283 nfs_grow_file(page
, offset
, count
);
284 /* Set the PG_uptodate flag? */
285 nfs_mark_uptodate(page
, offset
, count
);
286 nfs_unlock_request(req
);
290 static int wb_priority(struct writeback_control
*wbc
)
292 if (wbc
->for_reclaim
)
293 return FLUSH_HIGHPRI
;
294 if (wbc
->for_kupdate
)
300 * Write an mmapped page to the server.
302 int nfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
304 struct nfs_open_context
*ctx
;
305 #if 0 // mask by Victor Yu. 02-12-2007
306 struct inode
*inode
= page
->mapping
->host
;
308 struct inode
*inode
= page
->u
.xx
.mapping
->host
;
310 unsigned long end_index
;
311 unsigned offset
= PAGE_CACHE_SIZE
;
312 loff_t i_size
= i_size_read(inode
);
313 int inode_referenced
= 0;
314 int priority
= wb_priority(wbc
);
317 nfs_inc_stats(inode
, NFSIOS_VFSWRITEPAGE
);
318 nfs_add_stats(inode
, NFSIOS_WRITEPAGES
, 1);
321 * Note: We need to ensure that we have a reference to the inode
322 * if we are to do asynchronous writes. If not, waiting
323 * in nfs_wait_on_request() may deadlock with clear_inode().
325 * If igrab() fails here, then it is in any case safe to
326 * call nfs_wb_page(), since there will be no pending writes.
328 if (igrab(inode
) != 0)
329 inode_referenced
= 1;
330 end_index
= i_size
>> PAGE_CACHE_SHIFT
;
332 /* Ensure we've flushed out any previous writes */
333 nfs_wb_page_priority(inode
, page
, priority
);
336 if (page
->index
< end_index
)
338 /* things got complicated... */
339 offset
= i_size
& (PAGE_CACHE_SIZE
-1);
341 /* OK, are we completely out? */
342 err
= 0; /* potential race with truncate - ignore */
343 if (page
->index
>= end_index
+1 || !offset
)
346 ctx
= nfs_find_open_context(inode
, NULL
, FMODE_WRITE
);
352 if (!IS_SYNC(inode
) && inode_referenced
) {
353 err
= nfs_writepage_async(ctx
, inode
, page
, 0, offset
);
354 if (!wbc
->for_writepages
)
355 nfs_flush_inode(inode
, 0, 0, wb_priority(wbc
));
357 err
= nfs_writepage_sync(ctx
, inode
, page
, 0,
361 redirty_page_for_writepage(wbc
, page
);
366 put_nfs_open_context(ctx
);
369 if (inode_referenced
)
375 * Note: causes nfs_update_request() to block on the assumption
376 * that the writeback is generated due to memory pressure.
378 int nfs_writepages(struct address_space
*mapping
, struct writeback_control
*wbc
)
380 struct backing_dev_info
*bdi
= mapping
->backing_dev_info
;
381 struct inode
*inode
= mapping
->host
;
384 nfs_inc_stats(inode
, NFSIOS_VFSWRITEPAGES
);
386 err
= generic_writepages(mapping
, wbc
);
389 while (test_and_set_bit(BDI_write_congested
, &bdi
->state
) != 0) {
390 if (wbc
->nonblocking
)
392 nfs_wait_on_write_congestion(mapping
, 0);
394 err
= nfs_flush_inode(inode
, 0, 0, wb_priority(wbc
));
397 nfs_add_stats(inode
, NFSIOS_WRITEPAGES
, err
);
398 wbc
->nr_to_write
-= err
;
399 if (!wbc
->nonblocking
&& wbc
->sync_mode
== WB_SYNC_ALL
) {
400 err
= nfs_wait_on_requests(inode
, 0, 0);
404 err
= nfs_commit_inode(inode
, wb_priority(wbc
));
406 wbc
->nr_to_write
-= err
;
410 clear_bit(BDI_write_congested
, &bdi
->state
);
411 wake_up_all(&nfs_write_congestion
);
412 congestion_end(WRITE
);
417 * Insert a write request into an inode
419 static int nfs_inode_add_request(struct inode
*inode
, struct nfs_page
*req
)
421 struct nfs_inode
*nfsi
= NFS_I(inode
);
424 error
= radix_tree_insert(&nfsi
->nfs_page_tree
, req
->wb_index
, req
);
425 BUG_ON(error
== -EEXIST
);
430 nfs_begin_data_update(inode
);
431 if (nfs_have_delegation(inode
, FMODE_WRITE
))
434 SetPagePrivate(req
->wb_page
);
436 atomic_inc(&req
->wb_count
);
441 * Insert a write request into an inode
443 static void nfs_inode_remove_request(struct nfs_page
*req
)
445 struct inode
*inode
= req
->wb_context
->dentry
->d_inode
;
446 struct nfs_inode
*nfsi
= NFS_I(inode
);
448 BUG_ON (!NFS_WBACK_BUSY(req
));
450 spin_lock(&nfsi
->req_lock
);
451 ClearPagePrivate(req
->wb_page
);
452 radix_tree_delete(&nfsi
->nfs_page_tree
, req
->wb_index
);
455 spin_unlock(&nfsi
->req_lock
);
456 nfs_end_data_update(inode
);
459 spin_unlock(&nfsi
->req_lock
);
460 nfs_clear_request(req
);
461 nfs_release_request(req
);
467 static inline struct nfs_page
*
468 _nfs_find_request(struct inode
*inode
, unsigned long index
)
470 struct nfs_inode
*nfsi
= NFS_I(inode
);
471 struct nfs_page
*req
;
473 req
= (struct nfs_page
*)radix_tree_lookup(&nfsi
->nfs_page_tree
, index
);
475 atomic_inc(&req
->wb_count
);
479 static struct nfs_page
*
480 nfs_find_request(struct inode
*inode
, unsigned long index
)
482 struct nfs_page
*req
;
483 struct nfs_inode
*nfsi
= NFS_I(inode
);
485 spin_lock(&nfsi
->req_lock
);
486 req
= _nfs_find_request(inode
, index
);
487 spin_unlock(&nfsi
->req_lock
);
492 * Add a request to the inode's dirty list.
495 nfs_mark_request_dirty(struct nfs_page
*req
)
497 struct inode
*inode
= req
->wb_context
->dentry
->d_inode
;
498 struct nfs_inode
*nfsi
= NFS_I(inode
);
500 spin_lock(&nfsi
->req_lock
);
501 radix_tree_tag_set(&nfsi
->nfs_page_tree
,
502 req
->wb_index
, NFS_PAGE_TAG_DIRTY
);
503 nfs_list_add_request(req
, &nfsi
->dirty
);
505 spin_unlock(&nfsi
->req_lock
);
506 inc_zone_page_state(req
->wb_page
, NR_FILE_DIRTY
);
507 mark_inode_dirty(inode
);
511 * Check if a request is dirty
514 nfs_dirty_request(struct nfs_page
*req
)
516 struct nfs_inode
*nfsi
= NFS_I(req
->wb_context
->dentry
->d_inode
);
517 return !list_empty(&req
->wb_list
) && req
->wb_list_head
== &nfsi
->dirty
;
520 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
522 * Add a request to the inode's commit list.
525 nfs_mark_request_commit(struct nfs_page
*req
)
527 struct inode
*inode
= req
->wb_context
->dentry
->d_inode
;
528 struct nfs_inode
*nfsi
= NFS_I(inode
);
530 spin_lock(&nfsi
->req_lock
);
531 nfs_list_add_request(req
, &nfsi
->commit
);
533 spin_unlock(&nfsi
->req_lock
);
534 inc_zone_page_state(req
->wb_page
, NR_UNSTABLE_NFS
);
535 mark_inode_dirty(inode
);
540 * Wait for a request to complete.
542 * Interruptible by signals only if mounted with intr flag.
544 static int nfs_wait_on_requests_locked(struct inode
*inode
, unsigned long idx_start
, unsigned int npages
)
546 struct nfs_inode
*nfsi
= NFS_I(inode
);
547 struct nfs_page
*req
;
548 unsigned long idx_end
, next
;
549 unsigned int res
= 0;
555 idx_end
= idx_start
+ npages
- 1;
558 while (radix_tree_gang_lookup_tag(&nfsi
->nfs_page_tree
, (void **)&req
, next
, 1, NFS_PAGE_TAG_WRITEBACK
)) {
559 if (req
->wb_index
> idx_end
)
562 next
= req
->wb_index
+ 1;
563 BUG_ON(!NFS_WBACK_BUSY(req
));
565 atomic_inc(&req
->wb_count
);
566 spin_unlock(&nfsi
->req_lock
);
567 error
= nfs_wait_on_request(req
);
568 nfs_release_request(req
);
569 spin_lock(&nfsi
->req_lock
);
577 static int nfs_wait_on_requests(struct inode
*inode
, unsigned long idx_start
, unsigned int npages
)
579 struct nfs_inode
*nfsi
= NFS_I(inode
);
582 spin_lock(&nfsi
->req_lock
);
583 ret
= nfs_wait_on_requests_locked(inode
, idx_start
, npages
);
584 spin_unlock(&nfsi
->req_lock
);
588 static void nfs_cancel_dirty_list(struct list_head
*head
)
590 struct nfs_page
*req
;
591 while(!list_empty(head
)) {
592 req
= nfs_list_entry(head
->next
);
593 nfs_list_remove_request(req
);
594 nfs_inode_remove_request(req
);
595 nfs_clear_page_writeback(req
);
599 static void nfs_cancel_commit_list(struct list_head
*head
)
601 struct nfs_page
*req
;
603 while(!list_empty(head
)) {
604 req
= nfs_list_entry(head
->next
);
605 dec_zone_page_state(req
->wb_page
, NR_UNSTABLE_NFS
);
606 nfs_list_remove_request(req
);
607 nfs_inode_remove_request(req
);
608 nfs_unlock_request(req
);
613 * nfs_scan_dirty - Scan an inode for dirty requests
614 * @inode: NFS inode to scan
615 * @dst: destination list
616 * @idx_start: lower bound of page->index to scan.
617 * @npages: idx_start + npages sets the upper bound to scan.
619 * Moves requests from the inode's dirty page list.
620 * The requests are *not* checked to ensure that they form a contiguous set.
623 nfs_scan_dirty(struct inode
*inode
, struct list_head
*dst
, unsigned long idx_start
, unsigned int npages
)
625 struct nfs_inode
*nfsi
= NFS_I(inode
);
628 if (nfsi
->ndirty
!= 0) {
629 res
= nfs_scan_lock_dirty(nfsi
, dst
, idx_start
, npages
);
631 if ((nfsi
->ndirty
== 0) != list_empty(&nfsi
->dirty
))
632 printk(KERN_ERR
"NFS: desynchronized value of nfs_i.ndirty.\n");
637 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
639 * nfs_scan_commit - Scan an inode for commit requests
640 * @inode: NFS inode to scan
641 * @dst: destination list
642 * @idx_start: lower bound of page->index to scan.
643 * @npages: idx_start + npages sets the upper bound to scan.
645 * Moves requests from the inode's 'commit' request list.
646 * The requests are *not* checked to ensure that they form a contiguous set.
649 nfs_scan_commit(struct inode
*inode
, struct list_head
*dst
, unsigned long idx_start
, unsigned int npages
)
651 struct nfs_inode
*nfsi
= NFS_I(inode
);
654 if (nfsi
->ncommit
!= 0) {
655 res
= nfs_scan_list(nfsi
, &nfsi
->commit
, dst
, idx_start
, npages
);
656 nfsi
->ncommit
-= res
;
657 if ((nfsi
->ncommit
== 0) != list_empty(&nfsi
->commit
))
658 printk(KERN_ERR
"NFS: desynchronized value of nfs_i.ncommit.\n");
663 static inline int nfs_scan_commit(struct inode
*inode
, struct list_head
*dst
, unsigned long idx_start
, unsigned int npages
)
669 static int nfs_wait_on_write_congestion(struct address_space
*mapping
, int intr
)
671 struct backing_dev_info
*bdi
= mapping
->backing_dev_info
;
677 if (!bdi_write_congested(bdi
))
680 nfs_inc_stats(mapping
->host
, NFSIOS_CONGESTIONWAIT
);
683 struct rpc_clnt
*clnt
= NFS_CLIENT(mapping
->host
);
686 rpc_clnt_sigmask(clnt
, &oldset
);
687 prepare_to_wait(&nfs_write_congestion
, &wait
, TASK_INTERRUPTIBLE
);
688 if (bdi_write_congested(bdi
)) {
694 rpc_clnt_sigunmask(clnt
, &oldset
);
696 prepare_to_wait(&nfs_write_congestion
, &wait
, TASK_UNINTERRUPTIBLE
);
697 if (bdi_write_congested(bdi
))
700 finish_wait(&nfs_write_congestion
, &wait
);
706 * Try to update any existing write request, or create one if there is none.
707 * In order to match, the request's credentials must match those of
708 * the calling process.
710 * Note: Should always be called with the Page Lock held!
712 static struct nfs_page
* nfs_update_request(struct nfs_open_context
* ctx
,
713 struct inode
*inode
, struct page
*page
,
714 unsigned int offset
, unsigned int bytes
)
716 struct nfs_server
*server
= NFS_SERVER(inode
);
717 struct nfs_inode
*nfsi
= NFS_I(inode
);
718 struct nfs_page
*req
, *new = NULL
;
719 unsigned long rqend
, end
;
721 end
= offset
+ bytes
;
723 #if 0 // mask by Victor Yu. 02-12-2007
724 if (nfs_wait_on_write_congestion(page
->mapping
, server
->flags
& NFS_MOUNT_INTR
))
726 if (nfs_wait_on_write_congestion(page
->u
.xx
.mapping
, server
->flags
& NFS_MOUNT_INTR
))
728 return ERR_PTR(-ERESTARTSYS
);
730 /* Loop over all inode entries and see if we find
731 * A request for the page we wish to update
733 spin_lock(&nfsi
->req_lock
);
734 req
= _nfs_find_request(inode
, page
->index
);
736 if (!nfs_lock_request_dontget(req
)) {
738 spin_unlock(&nfsi
->req_lock
);
739 error
= nfs_wait_on_request(req
);
740 nfs_release_request(req
);
743 nfs_release_request(new);
744 return ERR_PTR(error
);
748 spin_unlock(&nfsi
->req_lock
);
750 nfs_release_request(new);
756 nfs_lock_request_dontget(new);
757 error
= nfs_inode_add_request(inode
, new);
759 spin_unlock(&nfsi
->req_lock
);
760 nfs_unlock_request(new);
761 return ERR_PTR(error
);
763 spin_unlock(&nfsi
->req_lock
);
764 nfs_mark_request_dirty(new);
767 spin_unlock(&nfsi
->req_lock
);
769 new = nfs_create_request(ctx
, inode
, page
, offset
, bytes
);
774 /* We have a request for our page.
775 * If the creds don't match, or the
776 * page addresses don't match,
777 * tell the caller to wait on the conflicting
780 rqend
= req
->wb_offset
+ req
->wb_bytes
;
781 if (req
->wb_context
!= ctx
782 || req
->wb_page
!= page
783 || !nfs_dirty_request(req
)
784 || offset
> rqend
|| end
< req
->wb_offset
) {
785 nfs_unlock_request(req
);
786 return ERR_PTR(-EBUSY
);
789 /* Okay, the request matches. Update the region */
790 if (offset
< req
->wb_offset
) {
791 req
->wb_offset
= offset
;
792 req
->wb_pgbase
= offset
;
793 req
->wb_bytes
= rqend
- req
->wb_offset
;
797 req
->wb_bytes
= end
- req
->wb_offset
;
802 int nfs_flush_incompatible(struct file
*file
, struct page
*page
)
804 struct nfs_open_context
*ctx
= (struct nfs_open_context
*)file
->private_data
;
805 #if 0 // mask by Victor Yu. 02-12-2007
806 struct inode
*inode
= page
->mapping
->host
;
808 struct inode
*inode
= page
->u
.xx
.mapping
->host
;
810 struct nfs_page
*req
;
813 * Look for a request corresponding to this page. If there
814 * is one, and it belongs to another file, we flush it out
815 * before we try to copy anything into the page. Do this
816 * due to the lack of an ACCESS-type call in NFSv2.
817 * Also do the same if we find a request from an existing
820 req
= nfs_find_request(inode
, page
->index
);
822 if (req
->wb_page
!= page
|| ctx
!= req
->wb_context
)
823 status
= nfs_wb_page(inode
, page
);
824 nfs_release_request(req
);
826 return (status
< 0) ? status
: 0;
830 * Update and possibly write a cached page of an NFS file.
832 * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad
833 * things with a page scheduled for an RPC call (e.g. invalidate it).
835 int nfs_updatepage(struct file
*file
, struct page
*page
,
836 unsigned int offset
, unsigned int count
)
838 struct nfs_open_context
*ctx
= (struct nfs_open_context
*)file
->private_data
;
839 #if 0 // mask by Victor Yu. 02-12-2007
840 struct inode
*inode
= page
->mapping
->host
;
842 struct inode
*inode
= page
->u
.xx
.mapping
->host
;
844 struct nfs_page
*req
;
847 nfs_inc_stats(inode
, NFSIOS_VFSUPDATEPAGE
);
849 dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n",
850 file
->f_dentry
->d_parent
->d_name
.name
,
851 file
->f_dentry
->d_name
.name
, count
,
852 (long long)(page_offset(page
) +offset
));
854 if (IS_SYNC(inode
)) {
855 status
= nfs_writepage_sync(ctx
, inode
, page
, offset
, count
, 0);
857 if (offset
== 0 && status
== PAGE_CACHE_SIZE
)
858 SetPageUptodate(page
);
864 /* If we're not using byte range locks, and we know the page
865 * is entirely in cache, it may be more efficient to avoid
866 * fragmenting write requests.
868 if (PageUptodate(page
) && inode
->i_flock
== NULL
&& !(file
->f_mode
& O_SYNC
)) {
869 loff_t end_offs
= i_size_read(inode
) - 1;
870 unsigned long end_index
= end_offs
>> PAGE_CACHE_SHIFT
;
874 if (unlikely(end_offs
< 0)) {
876 } else if (page
->index
== end_index
) {
878 pglen
= (unsigned int)(end_offs
& (PAGE_CACHE_SIZE
-1)) + 1;
881 } else if (page
->index
< end_index
)
882 count
= PAGE_CACHE_SIZE
;
886 * Try to find an NFS request corresponding to this page
888 * If the existing request cannot be updated, we must flush
892 req
= nfs_update_request(ctx
, inode
, page
, offset
, count
);
893 status
= (IS_ERR(req
)) ? PTR_ERR(req
) : 0;
894 if (status
!= -EBUSY
)
896 /* Request could not be updated. Flush it out and try again */
897 status
= nfs_wb_page(inode
, page
);
898 } while (status
>= 0);
904 /* Update file length */
905 nfs_grow_file(page
, offset
, count
);
906 /* Set the PG_uptodate flag? */
907 nfs_mark_uptodate(page
, req
->wb_pgbase
, req
->wb_bytes
);
908 nfs_unlock_request(req
);
910 dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n",
911 status
, (long long)i_size_read(inode
));
913 ClearPageUptodate(page
);
917 static void nfs_writepage_release(struct nfs_page
*req
)
919 end_page_writeback(req
->wb_page
);
921 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
922 if (!PageError(req
->wb_page
)) {
923 if (NFS_NEED_RESCHED(req
)) {
924 nfs_mark_request_dirty(req
);
926 } else if (NFS_NEED_COMMIT(req
)) {
927 nfs_mark_request_commit(req
);
931 nfs_inode_remove_request(req
);
934 nfs_clear_commit(req
);
935 nfs_clear_reschedule(req
);
937 nfs_inode_remove_request(req
);
939 nfs_clear_page_writeback(req
);
942 static inline int flush_task_priority(int how
)
944 switch (how
& (FLUSH_HIGHPRI
|FLUSH_LOWPRI
)) {
946 return RPC_PRIORITY_HIGH
;
948 return RPC_PRIORITY_LOW
;
950 return RPC_PRIORITY_NORMAL
;
954 * Set up the argument/result storage required for the RPC call.
956 static void nfs_write_rpcsetup(struct nfs_page
*req
,
957 struct nfs_write_data
*data
,
958 const struct rpc_call_ops
*call_ops
,
959 unsigned int count
, unsigned int offset
,
965 /* Set up the RPC argument and reply structs
966 * NB: take care not to mess about with data->commit et al. */
969 data
->inode
= inode
= req
->wb_context
->dentry
->d_inode
;
970 data
->cred
= req
->wb_context
->cred
;
972 data
->args
.fh
= NFS_FH(inode
);
973 data
->args
.offset
= req_offset(req
) + offset
;
974 data
->args
.pgbase
= req
->wb_pgbase
+ offset
;
975 data
->args
.pages
= data
->pagevec
;
976 data
->args
.count
= count
;
977 data
->args
.context
= req
->wb_context
;
979 data
->res
.fattr
= &data
->fattr
;
980 data
->res
.count
= count
;
981 data
->res
.verf
= &data
->verf
;
982 nfs_fattr_init(&data
->fattr
);
984 /* Set up the initial task struct. */
985 flags
= (how
& FLUSH_SYNC
) ? 0 : RPC_TASK_ASYNC
;
986 rpc_init_task(&data
->task
, NFS_CLIENT(inode
), flags
, call_ops
, data
);
987 NFS_PROTO(inode
)->write_setup(data
, how
);
989 data
->task
.tk_priority
= flush_task_priority(how
);
990 data
->task
.tk_cookie
= (unsigned long)inode
;
992 dprintk("NFS: %4d initiated write call (req %s/%Ld, %u bytes @ offset %Lu)\n",
995 (long long)NFS_FILEID(inode
),
997 (unsigned long long)data
->args
.offset
);
1000 static void nfs_execute_write(struct nfs_write_data
*data
)
1002 struct rpc_clnt
*clnt
= NFS_CLIENT(data
->inode
);
1005 rpc_clnt_sigmask(clnt
, &oldset
);
1007 rpc_execute(&data
->task
);
1009 rpc_clnt_sigunmask(clnt
, &oldset
);
1013 * Generate multiple small requests to write out a single
1014 * contiguous dirty area on one page.
1016 static int nfs_flush_multi(struct inode
*inode
, struct list_head
*head
, int how
)
1018 struct nfs_page
*req
= nfs_list_entry(head
->next
);
1019 struct page
*page
= req
->wb_page
;
1020 struct nfs_write_data
*data
;
1021 size_t wsize
= NFS_SERVER(inode
)->wsize
, nbytes
;
1022 unsigned int offset
;
1026 nfs_list_remove_request(req
);
1028 nbytes
= req
->wb_bytes
;
1030 size_t len
= min(nbytes
, wsize
);
1032 data
= nfs_writedata_alloc(len
);
1035 list_add(&data
->pages
, &list
);
1038 } while (nbytes
!= 0);
1039 atomic_set(&req
->wb_complete
, requests
);
1041 ClearPageError(page
);
1042 set_page_writeback(page
);
1044 nbytes
= req
->wb_bytes
;
1046 data
= list_entry(list
.next
, struct nfs_write_data
, pages
);
1047 list_del_init(&data
->pages
);
1049 data
->pagevec
[0] = page
;
1051 if (nbytes
> wsize
) {
1052 nfs_write_rpcsetup(req
, data
, &nfs_write_partial_ops
,
1053 wsize
, offset
, how
);
1057 nfs_write_rpcsetup(req
, data
, &nfs_write_partial_ops
,
1058 nbytes
, offset
, how
);
1061 nfs_execute_write(data
);
1062 } while (nbytes
!= 0);
1067 while (!list_empty(&list
)) {
1068 data
= list_entry(list
.next
, struct nfs_write_data
, pages
);
1069 list_del(&data
->pages
);
1070 nfs_writedata_free(data
);
1072 nfs_mark_request_dirty(req
);
1073 nfs_clear_page_writeback(req
);
1078 * Create an RPC task for the given write request and kick it.
1079 * The page must have been locked by the caller.
1081 * It may happen that the page we're passed is not marked dirty.
1082 * This is the case if nfs_updatepage detects a conflicting request
1083 * that has been written but not committed.
1085 static int nfs_flush_one(struct inode
*inode
, struct list_head
*head
, int how
)
1087 struct nfs_page
*req
;
1088 struct page
**pages
;
1089 struct nfs_write_data
*data
;
1092 data
= nfs_writedata_alloc(NFS_SERVER(inode
)->wsize
);
1096 pages
= data
->pagevec
;
1098 while (!list_empty(head
)) {
1099 req
= nfs_list_entry(head
->next
);
1100 nfs_list_remove_request(req
);
1101 nfs_list_add_request(req
, &data
->pages
);
1102 ClearPageError(req
->wb_page
);
1103 set_page_writeback(req
->wb_page
);
1104 *pages
++ = req
->wb_page
;
1105 count
+= req
->wb_bytes
;
1107 req
= nfs_list_entry(data
->pages
.next
);
1109 /* Set up the argument struct */
1110 nfs_write_rpcsetup(req
, data
, &nfs_write_full_ops
, count
, 0, how
);
1112 nfs_execute_write(data
);
1115 while (!list_empty(head
)) {
1116 struct nfs_page
*req
= nfs_list_entry(head
->next
);
1117 nfs_list_remove_request(req
);
1118 nfs_mark_request_dirty(req
);
1119 nfs_clear_page_writeback(req
);
1124 static int nfs_flush_list(struct inode
*inode
, struct list_head
*head
, int npages
, int how
)
1126 LIST_HEAD(one_request
);
1127 int (*flush_one
)(struct inode
*, struct list_head
*, int);
1128 struct nfs_page
*req
;
1129 int wpages
= NFS_SERVER(inode
)->wpages
;
1130 int wsize
= NFS_SERVER(inode
)->wsize
;
1133 flush_one
= nfs_flush_one
;
1134 if (wsize
< PAGE_CACHE_SIZE
)
1135 flush_one
= nfs_flush_multi
;
1136 /* For single writes, FLUSH_STABLE is more efficient */
1137 if (npages
<= wpages
&& npages
== NFS_I(inode
)->npages
1138 && nfs_list_entry(head
->next
)->wb_bytes
<= wsize
)
1139 how
|= FLUSH_STABLE
;
1142 nfs_coalesce_requests(head
, &one_request
, wpages
);
1143 req
= nfs_list_entry(one_request
.next
);
1144 error
= flush_one(inode
, &one_request
, how
);
1147 } while (!list_empty(head
));
1150 while (!list_empty(head
)) {
1151 req
= nfs_list_entry(head
->next
);
1152 nfs_list_remove_request(req
);
1153 nfs_mark_request_dirty(req
);
1154 nfs_clear_page_writeback(req
);
1160 * Handle a write reply that flushed part of a page.
1162 static void nfs_writeback_done_partial(struct rpc_task
*task
, void *calldata
)
1164 struct nfs_write_data
*data
= calldata
;
1165 struct nfs_page
*req
= data
->req
;
1166 struct page
*page
= req
->wb_page
;
1168 dprintk("NFS: write (%s/%Ld %d@%Ld)",
1169 req
->wb_context
->dentry
->d_inode
->i_sb
->s_id
,
1170 (long long)NFS_FILEID(req
->wb_context
->dentry
->d_inode
),
1172 (long long)req_offset(req
));
1174 if (nfs_writeback_done(task
, data
) != 0)
1177 if (task
->tk_status
< 0) {
1178 ClearPageUptodate(page
);
1180 req
->wb_context
->error
= task
->tk_status
;
1181 dprintk(", error = %d\n", task
->tk_status
);
1183 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1184 if (data
->verf
.committed
< NFS_FILE_SYNC
) {
1185 if (!NFS_NEED_COMMIT(req
)) {
1186 nfs_defer_commit(req
);
1187 memcpy(&req
->wb_verf
, &data
->verf
, sizeof(req
->wb_verf
));
1188 dprintk(" defer commit\n");
1189 } else if (memcmp(&req
->wb_verf
, &data
->verf
, sizeof(req
->wb_verf
))) {
1190 nfs_defer_reschedule(req
);
1191 dprintk(" server reboot detected\n");
1198 if (atomic_dec_and_test(&req
->wb_complete
))
1199 nfs_writepage_release(req
);
1202 static const struct rpc_call_ops nfs_write_partial_ops
= {
1203 .rpc_call_done
= nfs_writeback_done_partial
,
1204 .rpc_release
= nfs_writedata_release
,
1208 * Handle a write reply that flushes a whole page.
1210 * FIXME: There is an inherent race with invalidate_inode_pages and
1211 * writebacks since the page->count is kept > 1 for as long
1212 * as the page has a write request pending.
1214 static void nfs_writeback_done_full(struct rpc_task
*task
, void *calldata
)
1216 struct nfs_write_data
*data
= calldata
;
1217 struct nfs_page
*req
;
1220 if (nfs_writeback_done(task
, data
) != 0)
1223 /* Update attributes as result of writeback. */
1224 while (!list_empty(&data
->pages
)) {
1225 req
= nfs_list_entry(data
->pages
.next
);
1226 nfs_list_remove_request(req
);
1227 page
= req
->wb_page
;
1229 dprintk("NFS: write (%s/%Ld %d@%Ld)",
1230 req
->wb_context
->dentry
->d_inode
->i_sb
->s_id
,
1231 (long long)NFS_FILEID(req
->wb_context
->dentry
->d_inode
),
1233 (long long)req_offset(req
));
1235 if (task
->tk_status
< 0) {
1236 ClearPageUptodate(page
);
1238 req
->wb_context
->error
= task
->tk_status
;
1239 end_page_writeback(page
);
1240 nfs_inode_remove_request(req
);
1241 dprintk(", error = %d\n", task
->tk_status
);
1244 end_page_writeback(page
);
1246 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1247 if (data
->args
.stable
!= NFS_UNSTABLE
|| data
->verf
.committed
== NFS_FILE_SYNC
) {
1248 nfs_inode_remove_request(req
);
1252 memcpy(&req
->wb_verf
, &data
->verf
, sizeof(req
->wb_verf
));
1253 nfs_mark_request_commit(req
);
1254 dprintk(" marked for commit\n");
1256 nfs_inode_remove_request(req
);
1259 nfs_clear_page_writeback(req
);
1263 static const struct rpc_call_ops nfs_write_full_ops
= {
1264 .rpc_call_done
= nfs_writeback_done_full
,
1265 .rpc_release
= nfs_writedata_release
,
1270 * This function is called when the WRITE call is complete.
1272 int nfs_writeback_done(struct rpc_task
*task
, struct nfs_write_data
*data
)
1274 struct nfs_writeargs
*argp
= &data
->args
;
1275 struct nfs_writeres
*resp
= &data
->res
;
1278 dprintk("NFS: %4d nfs_writeback_done (status %d)\n",
1279 task
->tk_pid
, task
->tk_status
);
1282 * ->write_done will attempt to use post-op attributes to detect
1283 * conflicting writes by other clients. A strict interpretation
1284 * of close-to-open would allow us to continue caching even if
1285 * another writer had changed the file, but some applications
1286 * depend on tighter cache coherency when writing.
1288 status
= NFS_PROTO(data
->inode
)->write_done(task
, data
);
1291 nfs_add_stats(data
->inode
, NFSIOS_SERVERWRITTENBYTES
, resp
->count
);
1293 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1294 if (resp
->verf
->committed
< argp
->stable
&& task
->tk_status
>= 0) {
1295 /* We tried a write call, but the server did not
1296 * commit data to stable storage even though we
1298 * Note: There is a known bug in Tru64 < 5.0 in which
1299 * the server reports NFS_DATA_SYNC, but performs
1300 * NFS_FILE_SYNC. We therefore implement this checking
1301 * as a dprintk() in order to avoid filling syslog.
1303 static unsigned long complain
;
1305 if (time_before(complain
, jiffies
)) {
1306 dprintk("NFS: faulty NFS server %s:"
1307 " (committed = %d) != (stable = %d)\n",
1308 NFS_SERVER(data
->inode
)->nfs_client
->cl_hostname
,
1309 resp
->verf
->committed
, argp
->stable
);
1310 complain
= jiffies
+ 300 * HZ
;
1314 /* Is this a short write? */
1315 if (task
->tk_status
>= 0 && resp
->count
< argp
->count
) {
1316 static unsigned long complain
;
1318 nfs_inc_stats(data
->inode
, NFSIOS_SHORTWRITE
);
1320 /* Has the server at least made some progress? */
1321 if (resp
->count
!= 0) {
1322 /* Was this an NFSv2 write or an NFSv3 stable write? */
1323 if (resp
->verf
->committed
!= NFS_UNSTABLE
) {
1324 /* Resend from where the server left off */
1325 argp
->offset
+= resp
->count
;
1326 argp
->pgbase
+= resp
->count
;
1327 argp
->count
-= resp
->count
;
1329 /* Resend as a stable write in order to avoid
1330 * headaches in the case of a server crash.
1332 argp
->stable
= NFS_FILE_SYNC
;
1334 rpc_restart_call(task
);
1337 if (time_before(complain
, jiffies
)) {
1339 "NFS: Server wrote zero bytes, expected %u.\n",
1341 complain
= jiffies
+ 300 * HZ
;
1343 /* Can't do anything about it except throw an error. */
1344 task
->tk_status
= -EIO
;
1350 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1351 void nfs_commit_release(void *wdata
)
1353 nfs_commit_free(wdata
);
1357 * Set up the argument/result storage required for the RPC call.
1359 static void nfs_commit_rpcsetup(struct list_head
*head
,
1360 struct nfs_write_data
*data
,
1363 struct nfs_page
*first
;
1364 struct inode
*inode
;
1367 /* Set up the RPC argument and reply structs
1368 * NB: take care not to mess about with data->commit et al. */
1370 list_splice_init(head
, &data
->pages
);
1371 first
= nfs_list_entry(data
->pages
.next
);
1372 inode
= first
->wb_context
->dentry
->d_inode
;
1374 data
->inode
= inode
;
1375 data
->cred
= first
->wb_context
->cred
;
1377 data
->args
.fh
= NFS_FH(data
->inode
);
1378 /* Note: we always request a commit of the entire inode */
1379 data
->args
.offset
= 0;
1380 data
->args
.count
= 0;
1381 data
->res
.count
= 0;
1382 data
->res
.fattr
= &data
->fattr
;
1383 data
->res
.verf
= &data
->verf
;
1384 nfs_fattr_init(&data
->fattr
);
1386 /* Set up the initial task struct. */
1387 flags
= (how
& FLUSH_SYNC
) ? 0 : RPC_TASK_ASYNC
;
1388 rpc_init_task(&data
->task
, NFS_CLIENT(inode
), flags
, &nfs_commit_ops
, data
);
1389 NFS_PROTO(inode
)->commit_setup(data
, how
);
1391 data
->task
.tk_priority
= flush_task_priority(how
);
1392 data
->task
.tk_cookie
= (unsigned long)inode
;
1394 dprintk("NFS: %4d initiated commit call\n", data
->task
.tk_pid
);
1398 * Commit dirty pages
1401 nfs_commit_list(struct inode
*inode
, struct list_head
*head
, int how
)
1403 struct nfs_write_data
*data
;
1404 struct nfs_page
*req
;
1406 data
= nfs_commit_alloc();
1411 /* Set up the argument struct */
1412 nfs_commit_rpcsetup(head
, data
, how
);
1414 nfs_execute_write(data
);
1417 while (!list_empty(head
)) {
1418 req
= nfs_list_entry(head
->next
);
1419 nfs_list_remove_request(req
);
1420 nfs_mark_request_commit(req
);
1421 dec_zone_page_state(req
->wb_page
, NR_UNSTABLE_NFS
);
1422 nfs_clear_page_writeback(req
);
1428 * COMMIT call returned
1430 static void nfs_commit_done(struct rpc_task
*task
, void *calldata
)
1432 struct nfs_write_data
*data
= calldata
;
1433 struct nfs_page
*req
;
1435 dprintk("NFS: %4d nfs_commit_done (status %d)\n",
1436 task
->tk_pid
, task
->tk_status
);
1438 /* Call the NFS version-specific code */
1439 if (NFS_PROTO(data
->inode
)->commit_done(task
, data
) != 0)
1442 while (!list_empty(&data
->pages
)) {
1443 req
= nfs_list_entry(data
->pages
.next
);
1444 nfs_list_remove_request(req
);
1445 dec_zone_page_state(req
->wb_page
, NR_UNSTABLE_NFS
);
1447 dprintk("NFS: commit (%s/%Ld %d@%Ld)",
1448 req
->wb_context
->dentry
->d_inode
->i_sb
->s_id
,
1449 (long long)NFS_FILEID(req
->wb_context
->dentry
->d_inode
),
1451 (long long)req_offset(req
));
1452 if (task
->tk_status
< 0) {
1453 req
->wb_context
->error
= task
->tk_status
;
1454 nfs_inode_remove_request(req
);
1455 dprintk(", error = %d\n", task
->tk_status
);
1459 /* Okay, COMMIT succeeded, apparently. Check the verifier
1460 * returned by the server against all stored verfs. */
1461 if (!memcmp(req
->wb_verf
.verifier
, data
->verf
.verifier
, sizeof(data
->verf
.verifier
))) {
1462 /* We have a match */
1463 nfs_inode_remove_request(req
);
1467 /* We have a mismatch. Write the page again */
1468 dprintk(" mismatch\n");
1469 nfs_mark_request_dirty(req
);
1471 nfs_clear_page_writeback(req
);
1475 static const struct rpc_call_ops nfs_commit_ops
= {
1476 .rpc_call_done
= nfs_commit_done
,
1477 .rpc_release
= nfs_commit_release
,
1480 static inline int nfs_commit_list(struct inode
*inode
, struct list_head
*head
, int how
)
1486 static int nfs_flush_inode(struct inode
*inode
, unsigned long idx_start
,
1487 unsigned int npages
, int how
)
1489 struct nfs_inode
*nfsi
= NFS_I(inode
);
1493 spin_lock(&nfsi
->req_lock
);
1494 res
= nfs_scan_dirty(inode
, &head
, idx_start
, npages
);
1495 spin_unlock(&nfsi
->req_lock
);
1497 int error
= nfs_flush_list(inode
, &head
, res
, how
);
1504 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1505 int nfs_commit_inode(struct inode
*inode
, int how
)
1507 struct nfs_inode
*nfsi
= NFS_I(inode
);
1511 spin_lock(&nfsi
->req_lock
);
1512 res
= nfs_scan_commit(inode
, &head
, 0, 0);
1513 spin_unlock(&nfsi
->req_lock
);
1515 int error
= nfs_commit_list(inode
, &head
, how
);
1523 int nfs_sync_inode_wait(struct inode
*inode
, unsigned long idx_start
,
1524 unsigned int npages
, int how
)
1526 struct nfs_inode
*nfsi
= NFS_I(inode
);
1528 int nocommit
= how
& FLUSH_NOCOMMIT
;
1531 how
&= ~FLUSH_NOCOMMIT
;
1532 spin_lock(&nfsi
->req_lock
);
1534 ret
= nfs_wait_on_requests_locked(inode
, idx_start
, npages
);
1537 pages
= nfs_scan_dirty(inode
, &head
, idx_start
, npages
);
1539 spin_unlock(&nfsi
->req_lock
);
1540 if (how
& FLUSH_INVALIDATE
)
1541 nfs_cancel_dirty_list(&head
);
1543 ret
= nfs_flush_list(inode
, &head
, pages
, how
);
1544 spin_lock(&nfsi
->req_lock
);
1549 pages
= nfs_scan_commit(inode
, &head
, idx_start
, npages
);
1552 if (how
& FLUSH_INVALIDATE
) {
1553 spin_unlock(&nfsi
->req_lock
);
1554 nfs_cancel_commit_list(&head
);
1555 spin_lock(&nfsi
->req_lock
);
1558 pages
+= nfs_scan_commit(inode
, &head
, 0, 0);
1559 spin_unlock(&nfsi
->req_lock
);
1560 ret
= nfs_commit_list(inode
, &head
, how
);
1561 spin_lock(&nfsi
->req_lock
);
1563 spin_unlock(&nfsi
->req_lock
);
1567 int __init
nfs_init_writepagecache(void)
1569 nfs_wdata_cachep
= kmem_cache_create("nfs_write_data",
1570 sizeof(struct nfs_write_data
),
1571 0, SLAB_HWCACHE_ALIGN
,
1573 if (nfs_wdata_cachep
== NULL
)
1576 nfs_wdata_mempool
= mempool_create_slab_pool(MIN_POOL_WRITE
,
1578 if (nfs_wdata_mempool
== NULL
)
1581 nfs_commit_mempool
= mempool_create_slab_pool(MIN_POOL_COMMIT
,
1583 if (nfs_commit_mempool
== NULL
)
1589 void nfs_destroy_writepagecache(void)
1591 mempool_destroy(nfs_commit_mempool
);
1592 mempool_destroy(nfs_wdata_mempool
);
1593 kmem_cache_destroy(nfs_wdata_cachep
);