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"
69 #define NFSDBG_FACILITY NFSDBG_PAGECACHE
71 #define MIN_POOL_WRITE (32)
72 #define MIN_POOL_COMMIT (4)
75 * Local function declarations
77 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 long nfs_flush_mapping(struct address_space
*mapping
, struct writeback_control
*wbc
, int how
);
83 static int nfs_wb_page_priority(struct inode
*inode
, struct page
*page
, 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_rcu_free(struct rcu_head
*head
)
107 struct nfs_write_data
*p
= container_of(head
, struct nfs_write_data
, task
.u
.tk_rcu
);
108 if (p
&& (p
->pagevec
!= &p
->page_array
[0]))
110 mempool_free(p
, nfs_commit_mempool
);
113 void nfs_commit_free(struct nfs_write_data
*wdata
)
115 call_rcu_bh(&wdata
->task
.u
.tk_rcu
, nfs_commit_rcu_free
);
118 struct nfs_write_data
*nfs_writedata_alloc(size_t len
)
120 unsigned int pagecount
= (len
+ PAGE_SIZE
- 1) >> PAGE_SHIFT
;
121 struct nfs_write_data
*p
= mempool_alloc(nfs_wdata_mempool
, SLAB_NOFS
);
124 memset(p
, 0, sizeof(*p
));
125 INIT_LIST_HEAD(&p
->pages
);
126 p
->npages
= pagecount
;
127 if (pagecount
<= ARRAY_SIZE(p
->page_array
))
128 p
->pagevec
= p
->page_array
;
130 p
->pagevec
= kcalloc(pagecount
, sizeof(struct page
*), GFP_NOFS
);
132 mempool_free(p
, nfs_wdata_mempool
);
140 static void nfs_writedata_rcu_free(struct rcu_head
*head
)
142 struct nfs_write_data
*p
= container_of(head
, struct nfs_write_data
, task
.u
.tk_rcu
);
143 if (p
&& (p
->pagevec
!= &p
->page_array
[0]))
145 mempool_free(p
, nfs_wdata_mempool
);
148 static void nfs_writedata_free(struct nfs_write_data
*wdata
)
150 call_rcu_bh(&wdata
->task
.u
.tk_rcu
, nfs_writedata_rcu_free
);
153 void nfs_writedata_release(void *wdata
)
155 nfs_writedata_free(wdata
);
158 static struct nfs_page
*nfs_page_find_request_locked(struct page
*page
)
160 struct nfs_page
*req
= NULL
;
162 if (PagePrivate(page
)) {
163 req
= (struct nfs_page
*)page_private(page
);
165 atomic_inc(&req
->wb_count
);
170 static struct nfs_page
*nfs_page_find_request(struct page
*page
)
172 struct nfs_page
*req
= NULL
;
173 spinlock_t
*req_lock
= &NFS_I(page
->mapping
->host
)->req_lock
;
176 req
= nfs_page_find_request_locked(page
);
177 spin_unlock(req_lock
);
181 /* Adjust the file length if we're writing beyond the end */
182 static void nfs_grow_file(struct page
*page
, unsigned int offset
, unsigned int count
)
184 struct inode
*inode
= page
->mapping
->host
;
185 loff_t end
, i_size
= i_size_read(inode
);
186 unsigned long end_index
= (i_size
- 1) >> PAGE_CACHE_SHIFT
;
188 if (i_size
> 0 && page
->index
< end_index
)
190 end
= ((loff_t
)page
->index
<< PAGE_CACHE_SHIFT
) + ((loff_t
)offset
+count
);
193 nfs_inc_stats(inode
, NFSIOS_EXTENDWRITE
);
194 i_size_write(inode
, end
);
197 /* We can set the PG_uptodate flag if we see that a write request
198 * covers the full page.
200 static void nfs_mark_uptodate(struct page
*page
, unsigned int base
, unsigned int count
)
202 if (PageUptodate(page
))
206 if (count
!= nfs_page_length(page
))
208 if (count
!= PAGE_CACHE_SIZE
)
209 memclear_highpage_flush(page
, count
, PAGE_CACHE_SIZE
- count
);
210 SetPageUptodate(page
);
214 * Write a page synchronously.
215 * Offset is the data offset within the page.
217 static int nfs_writepage_sync(struct nfs_open_context
*ctx
, struct page
*page
,
218 unsigned int offset
, unsigned int count
, int how
)
220 struct inode
*inode
= page
->mapping
->host
;
221 unsigned int wsize
= NFS_SERVER(inode
)->wsize
;
222 int result
, written
= 0;
223 struct nfs_write_data
*wdata
;
225 wdata
= nfs_writedata_alloc(wsize
);
230 wdata
->cred
= ctx
->cred
;
231 wdata
->inode
= inode
;
232 wdata
->args
.fh
= NFS_FH(inode
);
233 wdata
->args
.context
= ctx
;
234 wdata
->args
.pages
= &page
;
235 wdata
->args
.stable
= NFS_FILE_SYNC
;
236 wdata
->args
.pgbase
= offset
;
237 wdata
->args
.count
= wsize
;
238 wdata
->res
.fattr
= &wdata
->fattr
;
239 wdata
->res
.verf
= &wdata
->verf
;
241 dprintk("NFS: nfs_writepage_sync(%s/%Ld %d@%Ld)\n",
243 (long long)NFS_FILEID(inode
),
244 count
, (long long)(page_offset(page
) + offset
));
246 set_page_writeback(page
);
247 nfs_begin_data_update(inode
);
250 wdata
->args
.count
= count
;
251 wdata
->args
.offset
= page_offset(page
) + wdata
->args
.pgbase
;
253 result
= NFS_PROTO(inode
)->write(wdata
);
256 /* Must mark the page invalid after I/O error */
257 ClearPageUptodate(page
);
260 if (result
< wdata
->args
.count
)
261 printk(KERN_WARNING
"NFS: short write, count=%u, result=%d\n",
262 wdata
->args
.count
, result
);
264 wdata
->args
.offset
+= result
;
265 wdata
->args
.pgbase
+= result
;
268 nfs_add_stats(inode
, NFSIOS_SERVERWRITTENBYTES
, result
);
270 /* Update file length */
271 nfs_grow_file(page
, offset
, written
);
272 /* Set the PG_uptodate flag? */
273 nfs_mark_uptodate(page
, offset
, written
);
276 ClearPageError(page
);
279 nfs_end_data_update(inode
);
280 end_page_writeback(page
);
281 nfs_writedata_release(wdata
);
282 return written
? written
: result
;
285 static int nfs_writepage_setup(struct nfs_open_context
*ctx
, struct page
*page
,
286 unsigned int offset
, unsigned int count
)
288 struct nfs_page
*req
;
292 req
= nfs_update_request(ctx
, page
, offset
, count
);
298 ret
= nfs_wb_page(page
->mapping
->host
, page
);
302 /* Update file length */
303 nfs_grow_file(page
, offset
, count
);
304 /* Set the PG_uptodate flag? */
305 nfs_mark_uptodate(page
, offset
, count
);
306 nfs_unlock_request(req
);
310 static int wb_priority(struct writeback_control
*wbc
)
312 if (wbc
->for_reclaim
)
313 return FLUSH_HIGHPRI
;
314 if (wbc
->for_kupdate
)
320 * Write an mmapped page to the server.
322 int nfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
324 struct nfs_open_context
*ctx
;
325 struct inode
*inode
= page
->mapping
->host
;
329 nfs_inc_stats(inode
, NFSIOS_VFSWRITEPAGE
);
330 nfs_add_stats(inode
, NFSIOS_WRITEPAGES
, 1);
332 /* Ensure we've flushed out any previous writes */
333 nfs_wb_page_priority(inode
, page
, wb_priority(wbc
));
336 offset
= nfs_page_length(page
);
340 ctx
= nfs_find_open_context(inode
, NULL
, FMODE_WRITE
);
346 if (!IS_SYNC(inode
)) {
347 err
= nfs_writepage_setup(ctx
, page
, 0, offset
);
348 if (!wbc
->for_writepages
)
349 nfs_flush_mapping(page
->mapping
, wbc
, wb_priority(wbc
));
351 err
= nfs_writepage_sync(ctx
, page
, 0, offset
, wb_priority(wbc
));
354 redirty_page_for_writepage(wbc
, page
);
359 put_nfs_open_context(ctx
);
366 * Note: causes nfs_update_request() to block on the assumption
367 * that the writeback is generated due to memory pressure.
369 int nfs_writepages(struct address_space
*mapping
, struct writeback_control
*wbc
)
371 struct backing_dev_info
*bdi
= mapping
->backing_dev_info
;
372 struct inode
*inode
= mapping
->host
;
375 nfs_inc_stats(inode
, NFSIOS_VFSWRITEPAGES
);
377 err
= generic_writepages(mapping
, wbc
);
380 while (test_and_set_bit(BDI_write_congested
, &bdi
->state
) != 0) {
381 if (wbc
->nonblocking
)
383 nfs_wait_on_write_congestion(mapping
, 0);
385 err
= nfs_flush_mapping(mapping
, wbc
, wb_priority(wbc
));
388 nfs_add_stats(inode
, NFSIOS_WRITEPAGES
, err
);
389 if (!wbc
->nonblocking
&& wbc
->sync_mode
== WB_SYNC_ALL
) {
390 err
= nfs_wait_on_requests(inode
, 0, 0);
394 err
= nfs_commit_inode(inode
, wb_priority(wbc
));
398 clear_bit(BDI_write_congested
, &bdi
->state
);
399 wake_up_all(&nfs_write_congestion
);
400 congestion_end(WRITE
);
405 * Insert a write request into an inode
407 static int nfs_inode_add_request(struct inode
*inode
, struct nfs_page
*req
)
409 struct nfs_inode
*nfsi
= NFS_I(inode
);
412 error
= radix_tree_insert(&nfsi
->nfs_page_tree
, req
->wb_index
, req
);
413 BUG_ON(error
== -EEXIST
);
418 nfs_begin_data_update(inode
);
419 if (nfs_have_delegation(inode
, FMODE_WRITE
))
422 SetPagePrivate(req
->wb_page
);
423 set_page_private(req
->wb_page
, (unsigned long)req
);
425 atomic_inc(&req
->wb_count
);
430 * Insert a write request into an inode
432 static void nfs_inode_remove_request(struct nfs_page
*req
)
434 struct inode
*inode
= req
->wb_context
->dentry
->d_inode
;
435 struct nfs_inode
*nfsi
= NFS_I(inode
);
437 BUG_ON (!NFS_WBACK_BUSY(req
));
439 spin_lock(&nfsi
->req_lock
);
440 set_page_private(req
->wb_page
, 0);
441 ClearPagePrivate(req
->wb_page
);
442 radix_tree_delete(&nfsi
->nfs_page_tree
, req
->wb_index
);
445 spin_unlock(&nfsi
->req_lock
);
446 nfs_end_data_update(inode
);
449 spin_unlock(&nfsi
->req_lock
);
450 nfs_clear_request(req
);
451 nfs_release_request(req
);
455 * Add a request to the inode's dirty list.
458 nfs_mark_request_dirty(struct nfs_page
*req
)
460 struct inode
*inode
= req
->wb_context
->dentry
->d_inode
;
461 struct nfs_inode
*nfsi
= NFS_I(inode
);
463 spin_lock(&nfsi
->req_lock
);
464 radix_tree_tag_set(&nfsi
->nfs_page_tree
,
465 req
->wb_index
, NFS_PAGE_TAG_DIRTY
);
466 nfs_list_add_request(req
, &nfsi
->dirty
);
468 spin_unlock(&nfsi
->req_lock
);
469 inc_zone_page_state(req
->wb_page
, NR_FILE_DIRTY
);
470 mark_inode_dirty(inode
);
474 * Check if a request is dirty
477 nfs_dirty_request(struct nfs_page
*req
)
479 struct nfs_inode
*nfsi
= NFS_I(req
->wb_context
->dentry
->d_inode
);
480 return !list_empty(&req
->wb_list
) && req
->wb_list_head
== &nfsi
->dirty
;
483 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
485 * Add a request to the inode's commit list.
488 nfs_mark_request_commit(struct nfs_page
*req
)
490 struct inode
*inode
= req
->wb_context
->dentry
->d_inode
;
491 struct nfs_inode
*nfsi
= NFS_I(inode
);
493 spin_lock(&nfsi
->req_lock
);
494 nfs_list_add_request(req
, &nfsi
->commit
);
496 spin_unlock(&nfsi
->req_lock
);
497 inc_zone_page_state(req
->wb_page
, NR_UNSTABLE_NFS
);
498 mark_inode_dirty(inode
);
503 * Wait for a request to complete.
505 * Interruptible by signals only if mounted with intr flag.
507 static int nfs_wait_on_requests_locked(struct inode
*inode
, unsigned long idx_start
, unsigned int npages
)
509 struct nfs_inode
*nfsi
= NFS_I(inode
);
510 struct nfs_page
*req
;
511 unsigned long idx_end
, next
;
512 unsigned int res
= 0;
518 idx_end
= idx_start
+ npages
- 1;
521 while (radix_tree_gang_lookup_tag(&nfsi
->nfs_page_tree
, (void **)&req
, next
, 1, NFS_PAGE_TAG_WRITEBACK
)) {
522 if (req
->wb_index
> idx_end
)
525 next
= req
->wb_index
+ 1;
526 BUG_ON(!NFS_WBACK_BUSY(req
));
528 atomic_inc(&req
->wb_count
);
529 spin_unlock(&nfsi
->req_lock
);
530 error
= nfs_wait_on_request(req
);
531 nfs_release_request(req
);
532 spin_lock(&nfsi
->req_lock
);
540 static int nfs_wait_on_requests(struct inode
*inode
, unsigned long idx_start
, unsigned int npages
)
542 struct nfs_inode
*nfsi
= NFS_I(inode
);
545 spin_lock(&nfsi
->req_lock
);
546 ret
= nfs_wait_on_requests_locked(inode
, idx_start
, npages
);
547 spin_unlock(&nfsi
->req_lock
);
551 static void nfs_cancel_dirty_list(struct list_head
*head
)
553 struct nfs_page
*req
;
554 while(!list_empty(head
)) {
555 req
= nfs_list_entry(head
->next
);
556 nfs_list_remove_request(req
);
557 nfs_inode_remove_request(req
);
558 nfs_clear_page_writeback(req
);
562 static void nfs_cancel_commit_list(struct list_head
*head
)
564 struct nfs_page
*req
;
566 while(!list_empty(head
)) {
567 req
= nfs_list_entry(head
->next
);
568 dec_zone_page_state(req
->wb_page
, NR_UNSTABLE_NFS
);
569 nfs_list_remove_request(req
);
570 nfs_inode_remove_request(req
);
571 nfs_unlock_request(req
);
575 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
577 * nfs_scan_commit - Scan an inode for commit requests
578 * @inode: NFS inode to scan
579 * @dst: destination list
580 * @idx_start: lower bound of page->index to scan.
581 * @npages: idx_start + npages sets the upper bound to scan.
583 * Moves requests from the inode's 'commit' request list.
584 * The requests are *not* checked to ensure that they form a contiguous set.
587 nfs_scan_commit(struct inode
*inode
, struct list_head
*dst
, unsigned long idx_start
, unsigned int npages
)
589 struct nfs_inode
*nfsi
= NFS_I(inode
);
592 if (nfsi
->ncommit
!= 0) {
593 res
= nfs_scan_list(nfsi
, &nfsi
->commit
, dst
, idx_start
, npages
);
594 nfsi
->ncommit
-= res
;
595 if ((nfsi
->ncommit
== 0) != list_empty(&nfsi
->commit
))
596 printk(KERN_ERR
"NFS: desynchronized value of nfs_i.ncommit.\n");
601 static inline int nfs_scan_commit(struct inode
*inode
, struct list_head
*dst
, unsigned long idx_start
, unsigned int npages
)
607 static int nfs_wait_on_write_congestion(struct address_space
*mapping
, int intr
)
609 struct backing_dev_info
*bdi
= mapping
->backing_dev_info
;
615 if (!bdi_write_congested(bdi
))
618 nfs_inc_stats(mapping
->host
, NFSIOS_CONGESTIONWAIT
);
621 struct rpc_clnt
*clnt
= NFS_CLIENT(mapping
->host
);
624 rpc_clnt_sigmask(clnt
, &oldset
);
625 prepare_to_wait(&nfs_write_congestion
, &wait
, TASK_INTERRUPTIBLE
);
626 if (bdi_write_congested(bdi
)) {
632 rpc_clnt_sigunmask(clnt
, &oldset
);
634 prepare_to_wait(&nfs_write_congestion
, &wait
, TASK_UNINTERRUPTIBLE
);
635 if (bdi_write_congested(bdi
))
638 finish_wait(&nfs_write_congestion
, &wait
);
644 * Try to update any existing write request, or create one if there is none.
645 * In order to match, the request's credentials must match those of
646 * the calling process.
648 * Note: Should always be called with the Page Lock held!
650 static struct nfs_page
* nfs_update_request(struct nfs_open_context
* ctx
,
651 struct page
*page
, unsigned int offset
, unsigned int bytes
)
653 struct inode
*inode
= page
->mapping
->host
;
654 struct nfs_inode
*nfsi
= NFS_I(inode
);
655 struct nfs_page
*req
, *new = NULL
;
656 unsigned long rqend
, end
;
658 end
= offset
+ bytes
;
660 if (nfs_wait_on_write_congestion(page
->mapping
, NFS_SERVER(inode
)->flags
& NFS_MOUNT_INTR
))
661 return ERR_PTR(-ERESTARTSYS
);
663 /* Loop over all inode entries and see if we find
664 * A request for the page we wish to update
666 spin_lock(&nfsi
->req_lock
);
667 req
= nfs_page_find_request_locked(page
);
669 if (!nfs_lock_request_dontget(req
)) {
672 spin_unlock(&nfsi
->req_lock
);
673 error
= nfs_wait_on_request(req
);
674 nfs_release_request(req
);
677 nfs_release_request(new);
678 return ERR_PTR(error
);
682 spin_unlock(&nfsi
->req_lock
);
684 nfs_release_request(new);
690 nfs_lock_request_dontget(new);
691 error
= nfs_inode_add_request(inode
, new);
693 spin_unlock(&nfsi
->req_lock
);
694 nfs_unlock_request(new);
695 return ERR_PTR(error
);
697 spin_unlock(&nfsi
->req_lock
);
698 nfs_mark_request_dirty(new);
701 spin_unlock(&nfsi
->req_lock
);
703 new = nfs_create_request(ctx
, inode
, page
, offset
, bytes
);
708 /* We have a request for our page.
709 * If the creds don't match, or the
710 * page addresses don't match,
711 * tell the caller to wait on the conflicting
714 rqend
= req
->wb_offset
+ req
->wb_bytes
;
715 if (req
->wb_context
!= ctx
716 || req
->wb_page
!= page
717 || !nfs_dirty_request(req
)
718 || offset
> rqend
|| end
< req
->wb_offset
) {
719 nfs_unlock_request(req
);
720 return ERR_PTR(-EBUSY
);
723 /* Okay, the request matches. Update the region */
724 if (offset
< req
->wb_offset
) {
725 req
->wb_offset
= offset
;
726 req
->wb_pgbase
= offset
;
727 req
->wb_bytes
= rqend
- req
->wb_offset
;
731 req
->wb_bytes
= end
- req
->wb_offset
;
736 int nfs_flush_incompatible(struct file
*file
, struct page
*page
)
738 struct nfs_open_context
*ctx
= (struct nfs_open_context
*)file
->private_data
;
739 struct nfs_page
*req
;
742 * Look for a request corresponding to this page. If there
743 * is one, and it belongs to another file, we flush it out
744 * before we try to copy anything into the page. Do this
745 * due to the lack of an ACCESS-type call in NFSv2.
746 * Also do the same if we find a request from an existing
749 req
= nfs_page_find_request(page
);
751 int do_flush
= req
->wb_page
!= page
|| req
->wb_context
!= ctx
;
753 nfs_release_request(req
);
755 status
= nfs_wb_page(page
->mapping
->host
, page
);
757 return (status
< 0) ? status
: 0;
761 * Update and possibly write a cached page of an NFS file.
763 * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad
764 * things with a page scheduled for an RPC call (e.g. invalidate it).
766 int nfs_updatepage(struct file
*file
, struct page
*page
,
767 unsigned int offset
, unsigned int count
)
769 struct nfs_open_context
*ctx
= (struct nfs_open_context
*)file
->private_data
;
770 struct inode
*inode
= page
->mapping
->host
;
773 nfs_inc_stats(inode
, NFSIOS_VFSUPDATEPAGE
);
775 dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n",
776 file
->f_dentry
->d_parent
->d_name
.name
,
777 file
->f_dentry
->d_name
.name
, count
,
778 (long long)(page_offset(page
) +offset
));
780 if (IS_SYNC(inode
)) {
781 status
= nfs_writepage_sync(ctx
, page
, offset
, count
, 0);
783 if (offset
== 0 && status
== PAGE_CACHE_SIZE
)
784 SetPageUptodate(page
);
790 /* If we're not using byte range locks, and we know the page
791 * is entirely in cache, it may be more efficient to avoid
792 * fragmenting write requests.
794 if (PageUptodate(page
) && inode
->i_flock
== NULL
&& !(file
->f_mode
& O_SYNC
)) {
795 count
= max(count
+ offset
, nfs_page_length(page
));
799 status
= nfs_writepage_setup(ctx
, page
, offset
, count
);
801 dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n",
802 status
, (long long)i_size_read(inode
));
804 ClearPageUptodate(page
);
808 static void nfs_writepage_release(struct nfs_page
*req
)
810 end_page_writeback(req
->wb_page
);
812 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
813 if (!PageError(req
->wb_page
)) {
814 if (NFS_NEED_RESCHED(req
)) {
815 nfs_mark_request_dirty(req
);
817 } else if (NFS_NEED_COMMIT(req
)) {
818 nfs_mark_request_commit(req
);
822 nfs_inode_remove_request(req
);
825 nfs_clear_commit(req
);
826 nfs_clear_reschedule(req
);
828 nfs_inode_remove_request(req
);
830 nfs_clear_page_writeback(req
);
833 static inline int flush_task_priority(int how
)
835 switch (how
& (FLUSH_HIGHPRI
|FLUSH_LOWPRI
)) {
837 return RPC_PRIORITY_HIGH
;
839 return RPC_PRIORITY_LOW
;
841 return RPC_PRIORITY_NORMAL
;
845 * Set up the argument/result storage required for the RPC call.
847 static void nfs_write_rpcsetup(struct nfs_page
*req
,
848 struct nfs_write_data
*data
,
849 const struct rpc_call_ops
*call_ops
,
850 unsigned int count
, unsigned int offset
,
856 /* Set up the RPC argument and reply structs
857 * NB: take care not to mess about with data->commit et al. */
860 data
->inode
= inode
= req
->wb_context
->dentry
->d_inode
;
861 data
->cred
= req
->wb_context
->cred
;
863 data
->args
.fh
= NFS_FH(inode
);
864 data
->args
.offset
= req_offset(req
) + offset
;
865 data
->args
.pgbase
= req
->wb_pgbase
+ offset
;
866 data
->args
.pages
= data
->pagevec
;
867 data
->args
.count
= count
;
868 data
->args
.context
= req
->wb_context
;
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 flags
= (how
& FLUSH_SYNC
) ? 0 : RPC_TASK_ASYNC
;
877 rpc_init_task(&data
->task
, NFS_CLIENT(inode
), flags
, call_ops
, data
);
878 NFS_PROTO(inode
)->write_setup(data
, how
);
880 data
->task
.tk_priority
= flush_task_priority(how
);
881 data
->task
.tk_cookie
= (unsigned long)inode
;
883 dprintk("NFS: %4d initiated write call (req %s/%Ld, %u bytes @ offset %Lu)\n",
886 (long long)NFS_FILEID(inode
),
888 (unsigned long long)data
->args
.offset
);
891 static void nfs_execute_write(struct nfs_write_data
*data
)
893 struct rpc_clnt
*clnt
= NFS_CLIENT(data
->inode
);
896 rpc_clnt_sigmask(clnt
, &oldset
);
897 rpc_execute(&data
->task
);
898 rpc_clnt_sigunmask(clnt
, &oldset
);
902 * Generate multiple small requests to write out a single
903 * contiguous dirty area on one page.
905 static int nfs_flush_multi(struct inode
*inode
, struct list_head
*head
, int how
)
907 struct nfs_page
*req
= nfs_list_entry(head
->next
);
908 struct page
*page
= req
->wb_page
;
909 struct nfs_write_data
*data
;
910 size_t wsize
= NFS_SERVER(inode
)->wsize
, nbytes
;
915 nfs_list_remove_request(req
);
917 nbytes
= req
->wb_bytes
;
919 size_t len
= min(nbytes
, wsize
);
921 data
= nfs_writedata_alloc(len
);
924 list_add(&data
->pages
, &list
);
927 } while (nbytes
!= 0);
928 atomic_set(&req
->wb_complete
, requests
);
930 ClearPageError(page
);
931 set_page_writeback(page
);
933 nbytes
= req
->wb_bytes
;
935 data
= list_entry(list
.next
, struct nfs_write_data
, pages
);
936 list_del_init(&data
->pages
);
938 data
->pagevec
[0] = page
;
940 if (nbytes
> wsize
) {
941 nfs_write_rpcsetup(req
, data
, &nfs_write_partial_ops
,
946 nfs_write_rpcsetup(req
, data
, &nfs_write_partial_ops
,
947 nbytes
, offset
, how
);
950 nfs_execute_write(data
);
951 } while (nbytes
!= 0);
956 while (!list_empty(&list
)) {
957 data
= list_entry(list
.next
, struct nfs_write_data
, pages
);
958 list_del(&data
->pages
);
959 nfs_writedata_release(data
);
961 nfs_mark_request_dirty(req
);
962 nfs_clear_page_writeback(req
);
967 * Create an RPC task for the given write request and kick it.
968 * The page must have been locked by the caller.
970 * It may happen that the page we're passed is not marked dirty.
971 * This is the case if nfs_updatepage detects a conflicting request
972 * that has been written but not committed.
974 static int nfs_flush_one(struct inode
*inode
, struct list_head
*head
, int how
)
976 struct nfs_page
*req
;
978 struct nfs_write_data
*data
;
981 data
= nfs_writedata_alloc(NFS_SERVER(inode
)->wsize
);
985 pages
= data
->pagevec
;
987 while (!list_empty(head
)) {
988 req
= nfs_list_entry(head
->next
);
989 nfs_list_remove_request(req
);
990 nfs_list_add_request(req
, &data
->pages
);
991 ClearPageError(req
->wb_page
);
992 set_page_writeback(req
->wb_page
);
993 *pages
++ = req
->wb_page
;
994 count
+= req
->wb_bytes
;
996 req
= nfs_list_entry(data
->pages
.next
);
998 /* Set up the argument struct */
999 nfs_write_rpcsetup(req
, data
, &nfs_write_full_ops
, count
, 0, how
);
1001 nfs_execute_write(data
);
1004 while (!list_empty(head
)) {
1005 struct nfs_page
*req
= nfs_list_entry(head
->next
);
1006 nfs_list_remove_request(req
);
1007 nfs_mark_request_dirty(req
);
1008 nfs_clear_page_writeback(req
);
1013 static int nfs_flush_list(struct inode
*inode
, struct list_head
*head
, int npages
, int how
)
1015 LIST_HEAD(one_request
);
1016 int (*flush_one
)(struct inode
*, struct list_head
*, int);
1017 struct nfs_page
*req
;
1018 int wpages
= NFS_SERVER(inode
)->wpages
;
1019 int wsize
= NFS_SERVER(inode
)->wsize
;
1022 flush_one
= nfs_flush_one
;
1023 if (wsize
< PAGE_CACHE_SIZE
)
1024 flush_one
= nfs_flush_multi
;
1025 /* For single writes, FLUSH_STABLE is more efficient */
1026 if (npages
<= wpages
&& npages
== NFS_I(inode
)->npages
1027 && nfs_list_entry(head
->next
)->wb_bytes
<= wsize
)
1028 how
|= FLUSH_STABLE
;
1031 nfs_coalesce_requests(head
, &one_request
, wpages
);
1032 req
= nfs_list_entry(one_request
.next
);
1033 error
= flush_one(inode
, &one_request
, how
);
1036 } while (!list_empty(head
));
1039 while (!list_empty(head
)) {
1040 req
= nfs_list_entry(head
->next
);
1041 nfs_list_remove_request(req
);
1042 nfs_mark_request_dirty(req
);
1043 nfs_clear_page_writeback(req
);
1049 * Handle a write reply that flushed part of a page.
1051 static void nfs_writeback_done_partial(struct rpc_task
*task
, void *calldata
)
1053 struct nfs_write_data
*data
= calldata
;
1054 struct nfs_page
*req
= data
->req
;
1055 struct page
*page
= req
->wb_page
;
1057 dprintk("NFS: write (%s/%Ld %d@%Ld)",
1058 req
->wb_context
->dentry
->d_inode
->i_sb
->s_id
,
1059 (long long)NFS_FILEID(req
->wb_context
->dentry
->d_inode
),
1061 (long long)req_offset(req
));
1063 if (nfs_writeback_done(task
, data
) != 0)
1066 if (task
->tk_status
< 0) {
1067 ClearPageUptodate(page
);
1069 req
->wb_context
->error
= task
->tk_status
;
1070 dprintk(", error = %d\n", task
->tk_status
);
1072 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1073 if (data
->verf
.committed
< NFS_FILE_SYNC
) {
1074 if (!NFS_NEED_COMMIT(req
)) {
1075 nfs_defer_commit(req
);
1076 memcpy(&req
->wb_verf
, &data
->verf
, sizeof(req
->wb_verf
));
1077 dprintk(" defer commit\n");
1078 } else if (memcmp(&req
->wb_verf
, &data
->verf
, sizeof(req
->wb_verf
))) {
1079 nfs_defer_reschedule(req
);
1080 dprintk(" server reboot detected\n");
1087 if (atomic_dec_and_test(&req
->wb_complete
))
1088 nfs_writepage_release(req
);
1091 static const struct rpc_call_ops nfs_write_partial_ops
= {
1092 .rpc_call_done
= nfs_writeback_done_partial
,
1093 .rpc_release
= nfs_writedata_release
,
1097 * Handle a write reply that flushes a whole page.
1099 * FIXME: There is an inherent race with invalidate_inode_pages and
1100 * writebacks since the page->count is kept > 1 for as long
1101 * as the page has a write request pending.
1103 static void nfs_writeback_done_full(struct rpc_task
*task
, void *calldata
)
1105 struct nfs_write_data
*data
= calldata
;
1106 struct nfs_page
*req
;
1109 if (nfs_writeback_done(task
, data
) != 0)
1112 /* Update attributes as result of writeback. */
1113 while (!list_empty(&data
->pages
)) {
1114 req
= nfs_list_entry(data
->pages
.next
);
1115 nfs_list_remove_request(req
);
1116 page
= req
->wb_page
;
1118 dprintk("NFS: write (%s/%Ld %d@%Ld)",
1119 req
->wb_context
->dentry
->d_inode
->i_sb
->s_id
,
1120 (long long)NFS_FILEID(req
->wb_context
->dentry
->d_inode
),
1122 (long long)req_offset(req
));
1124 if (task
->tk_status
< 0) {
1125 ClearPageUptodate(page
);
1127 req
->wb_context
->error
= task
->tk_status
;
1128 end_page_writeback(page
);
1129 nfs_inode_remove_request(req
);
1130 dprintk(", error = %d\n", task
->tk_status
);
1133 end_page_writeback(page
);
1135 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1136 if (data
->args
.stable
!= NFS_UNSTABLE
|| data
->verf
.committed
== NFS_FILE_SYNC
) {
1137 nfs_inode_remove_request(req
);
1141 memcpy(&req
->wb_verf
, &data
->verf
, sizeof(req
->wb_verf
));
1142 nfs_mark_request_commit(req
);
1143 dprintk(" marked for commit\n");
1145 nfs_inode_remove_request(req
);
1148 nfs_clear_page_writeback(req
);
1152 static const struct rpc_call_ops nfs_write_full_ops
= {
1153 .rpc_call_done
= nfs_writeback_done_full
,
1154 .rpc_release
= nfs_writedata_release
,
1159 * This function is called when the WRITE call is complete.
1161 int nfs_writeback_done(struct rpc_task
*task
, struct nfs_write_data
*data
)
1163 struct nfs_writeargs
*argp
= &data
->args
;
1164 struct nfs_writeres
*resp
= &data
->res
;
1167 dprintk("NFS: %4d nfs_writeback_done (status %d)\n",
1168 task
->tk_pid
, task
->tk_status
);
1171 * ->write_done will attempt to use post-op attributes to detect
1172 * conflicting writes by other clients. A strict interpretation
1173 * of close-to-open would allow us to continue caching even if
1174 * another writer had changed the file, but some applications
1175 * depend on tighter cache coherency when writing.
1177 status
= NFS_PROTO(data
->inode
)->write_done(task
, data
);
1180 nfs_add_stats(data
->inode
, NFSIOS_SERVERWRITTENBYTES
, resp
->count
);
1182 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1183 if (resp
->verf
->committed
< argp
->stable
&& task
->tk_status
>= 0) {
1184 /* We tried a write call, but the server did not
1185 * commit data to stable storage even though we
1187 * Note: There is a known bug in Tru64 < 5.0 in which
1188 * the server reports NFS_DATA_SYNC, but performs
1189 * NFS_FILE_SYNC. We therefore implement this checking
1190 * as a dprintk() in order to avoid filling syslog.
1192 static unsigned long complain
;
1194 if (time_before(complain
, jiffies
)) {
1195 dprintk("NFS: faulty NFS server %s:"
1196 " (committed = %d) != (stable = %d)\n",
1197 NFS_SERVER(data
->inode
)->nfs_client
->cl_hostname
,
1198 resp
->verf
->committed
, argp
->stable
);
1199 complain
= jiffies
+ 300 * HZ
;
1203 /* Is this a short write? */
1204 if (task
->tk_status
>= 0 && resp
->count
< argp
->count
) {
1205 static unsigned long complain
;
1207 nfs_inc_stats(data
->inode
, NFSIOS_SHORTWRITE
);
1209 /* Has the server at least made some progress? */
1210 if (resp
->count
!= 0) {
1211 /* Was this an NFSv2 write or an NFSv3 stable write? */
1212 if (resp
->verf
->committed
!= NFS_UNSTABLE
) {
1213 /* Resend from where the server left off */
1214 argp
->offset
+= resp
->count
;
1215 argp
->pgbase
+= resp
->count
;
1216 argp
->count
-= resp
->count
;
1218 /* Resend as a stable write in order to avoid
1219 * headaches in the case of a server crash.
1221 argp
->stable
= NFS_FILE_SYNC
;
1223 rpc_restart_call(task
);
1226 if (time_before(complain
, jiffies
)) {
1228 "NFS: Server wrote zero bytes, expected %u.\n",
1230 complain
= jiffies
+ 300 * HZ
;
1232 /* Can't do anything about it except throw an error. */
1233 task
->tk_status
= -EIO
;
1239 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1240 void nfs_commit_release(void *wdata
)
1242 nfs_commit_free(wdata
);
1246 * Set up the argument/result storage required for the RPC call.
1248 static void nfs_commit_rpcsetup(struct list_head
*head
,
1249 struct nfs_write_data
*data
,
1252 struct nfs_page
*first
;
1253 struct inode
*inode
;
1256 /* Set up the RPC argument and reply structs
1257 * NB: take care not to mess about with data->commit et al. */
1259 list_splice_init(head
, &data
->pages
);
1260 first
= nfs_list_entry(data
->pages
.next
);
1261 inode
= first
->wb_context
->dentry
->d_inode
;
1263 data
->inode
= inode
;
1264 data
->cred
= first
->wb_context
->cred
;
1266 data
->args
.fh
= NFS_FH(data
->inode
);
1267 /* Note: we always request a commit of the entire inode */
1268 data
->args
.offset
= 0;
1269 data
->args
.count
= 0;
1270 data
->res
.count
= 0;
1271 data
->res
.fattr
= &data
->fattr
;
1272 data
->res
.verf
= &data
->verf
;
1273 nfs_fattr_init(&data
->fattr
);
1275 /* Set up the initial task struct. */
1276 flags
= (how
& FLUSH_SYNC
) ? 0 : RPC_TASK_ASYNC
;
1277 rpc_init_task(&data
->task
, NFS_CLIENT(inode
), flags
, &nfs_commit_ops
, data
);
1278 NFS_PROTO(inode
)->commit_setup(data
, how
);
1280 data
->task
.tk_priority
= flush_task_priority(how
);
1281 data
->task
.tk_cookie
= (unsigned long)inode
;
1283 dprintk("NFS: %4d initiated commit call\n", data
->task
.tk_pid
);
1287 * Commit dirty pages
1290 nfs_commit_list(struct inode
*inode
, struct list_head
*head
, int how
)
1292 struct nfs_write_data
*data
;
1293 struct nfs_page
*req
;
1295 data
= nfs_commit_alloc();
1300 /* Set up the argument struct */
1301 nfs_commit_rpcsetup(head
, data
, how
);
1303 nfs_execute_write(data
);
1306 while (!list_empty(head
)) {
1307 req
= nfs_list_entry(head
->next
);
1308 nfs_list_remove_request(req
);
1309 nfs_mark_request_commit(req
);
1310 dec_zone_page_state(req
->wb_page
, NR_UNSTABLE_NFS
);
1311 nfs_clear_page_writeback(req
);
1317 * COMMIT call returned
1319 static void nfs_commit_done(struct rpc_task
*task
, void *calldata
)
1321 struct nfs_write_data
*data
= calldata
;
1322 struct nfs_page
*req
;
1324 dprintk("NFS: %4d nfs_commit_done (status %d)\n",
1325 task
->tk_pid
, task
->tk_status
);
1327 /* Call the NFS version-specific code */
1328 if (NFS_PROTO(data
->inode
)->commit_done(task
, data
) != 0)
1331 while (!list_empty(&data
->pages
)) {
1332 req
= nfs_list_entry(data
->pages
.next
);
1333 nfs_list_remove_request(req
);
1334 dec_zone_page_state(req
->wb_page
, NR_UNSTABLE_NFS
);
1336 dprintk("NFS: commit (%s/%Ld %d@%Ld)",
1337 req
->wb_context
->dentry
->d_inode
->i_sb
->s_id
,
1338 (long long)NFS_FILEID(req
->wb_context
->dentry
->d_inode
),
1340 (long long)req_offset(req
));
1341 if (task
->tk_status
< 0) {
1342 req
->wb_context
->error
= task
->tk_status
;
1343 nfs_inode_remove_request(req
);
1344 dprintk(", error = %d\n", task
->tk_status
);
1348 /* Okay, COMMIT succeeded, apparently. Check the verifier
1349 * returned by the server against all stored verfs. */
1350 if (!memcmp(req
->wb_verf
.verifier
, data
->verf
.verifier
, sizeof(data
->verf
.verifier
))) {
1351 /* We have a match */
1352 nfs_inode_remove_request(req
);
1356 /* We have a mismatch. Write the page again */
1357 dprintk(" mismatch\n");
1358 nfs_mark_request_dirty(req
);
1360 nfs_clear_page_writeback(req
);
1364 static const struct rpc_call_ops nfs_commit_ops
= {
1365 .rpc_call_done
= nfs_commit_done
,
1366 .rpc_release
= nfs_commit_release
,
1369 static inline int nfs_commit_list(struct inode
*inode
, struct list_head
*head
, int how
)
1375 static long nfs_flush_mapping(struct address_space
*mapping
, struct writeback_control
*wbc
, int how
)
1377 struct nfs_inode
*nfsi
= NFS_I(mapping
->host
);
1381 spin_lock(&nfsi
->req_lock
);
1382 res
= nfs_scan_dirty(mapping
, wbc
, &head
);
1383 spin_unlock(&nfsi
->req_lock
);
1385 int error
= nfs_flush_list(mapping
->host
, &head
, res
, how
);
1392 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1393 int nfs_commit_inode(struct inode
*inode
, int how
)
1395 struct nfs_inode
*nfsi
= NFS_I(inode
);
1399 spin_lock(&nfsi
->req_lock
);
1400 res
= nfs_scan_commit(inode
, &head
, 0, 0);
1401 spin_unlock(&nfsi
->req_lock
);
1403 int error
= nfs_commit_list(inode
, &head
, how
);
1411 long nfs_sync_mapping_wait(struct address_space
*mapping
, struct writeback_control
*wbc
, int how
)
1413 struct inode
*inode
= mapping
->host
;
1414 struct nfs_inode
*nfsi
= NFS_I(inode
);
1415 unsigned long idx_start
, idx_end
;
1416 unsigned int npages
= 0;
1418 int nocommit
= how
& FLUSH_NOCOMMIT
;
1422 if (wbc
->range_cyclic
)
1425 idx_start
= wbc
->range_start
>> PAGE_CACHE_SHIFT
;
1426 idx_end
= wbc
->range_end
>> PAGE_CACHE_SHIFT
;
1427 if (idx_end
> idx_start
) {
1428 unsigned long l_npages
= 1 + idx_end
- idx_start
;
1430 if (sizeof(npages
) != sizeof(l_npages
) &&
1431 (unsigned long)npages
!= l_npages
)
1435 how
&= ~FLUSH_NOCOMMIT
;
1436 spin_lock(&nfsi
->req_lock
);
1438 wbc
->pages_skipped
= 0;
1439 ret
= nfs_wait_on_requests_locked(inode
, idx_start
, npages
);
1442 pages
= nfs_scan_dirty(mapping
, wbc
, &head
);
1444 spin_unlock(&nfsi
->req_lock
);
1445 if (how
& FLUSH_INVALIDATE
) {
1446 nfs_cancel_dirty_list(&head
);
1449 ret
= nfs_flush_list(inode
, &head
, pages
, how
);
1450 spin_lock(&nfsi
->req_lock
);
1453 if (wbc
->pages_skipped
!= 0)
1457 pages
= nfs_scan_commit(inode
, &head
, idx_start
, npages
);
1459 if (wbc
->pages_skipped
!= 0)
1463 if (how
& FLUSH_INVALIDATE
) {
1464 spin_unlock(&nfsi
->req_lock
);
1465 nfs_cancel_commit_list(&head
);
1467 spin_lock(&nfsi
->req_lock
);
1470 pages
+= nfs_scan_commit(inode
, &head
, 0, 0);
1471 spin_unlock(&nfsi
->req_lock
);
1472 ret
= nfs_commit_list(inode
, &head
, how
);
1473 spin_lock(&nfsi
->req_lock
);
1475 spin_unlock(&nfsi
->req_lock
);
1480 * flush the inode to disk.
1482 int nfs_wb_all(struct inode
*inode
)
1484 struct address_space
*mapping
= inode
->i_mapping
;
1485 struct writeback_control wbc
= {
1486 .bdi
= mapping
->backing_dev_info
,
1487 .sync_mode
= WB_SYNC_ALL
,
1488 .nr_to_write
= LONG_MAX
,
1493 ret
= nfs_sync_mapping_wait(mapping
, &wbc
, 0);
1499 int nfs_sync_mapping_range(struct address_space
*mapping
, loff_t range_start
, loff_t range_end
, int how
)
1501 struct writeback_control wbc
= {
1502 .bdi
= mapping
->backing_dev_info
,
1503 .sync_mode
= WB_SYNC_ALL
,
1504 .nr_to_write
= LONG_MAX
,
1505 .range_start
= range_start
,
1506 .range_end
= range_end
,
1510 ret
= nfs_sync_mapping_wait(mapping
, &wbc
, how
);
1516 static int nfs_wb_page_priority(struct inode
*inode
, struct page
*page
, int how
)
1518 loff_t range_start
= page_offset(page
);
1519 loff_t range_end
= range_start
+ (loff_t
)(PAGE_CACHE_SIZE
- 1);
1521 return nfs_sync_mapping_range(inode
->i_mapping
, range_start
, range_end
, how
| FLUSH_STABLE
);
1525 * Write back all requests on one page - we do this before reading it.
1527 int nfs_wb_page(struct inode
*inode
, struct page
* page
)
1529 return nfs_wb_page_priority(inode
, page
, 0);
1533 int __init
nfs_init_writepagecache(void)
1535 nfs_wdata_cachep
= kmem_cache_create("nfs_write_data",
1536 sizeof(struct nfs_write_data
),
1537 0, SLAB_HWCACHE_ALIGN
,
1539 if (nfs_wdata_cachep
== NULL
)
1542 nfs_wdata_mempool
= mempool_create_slab_pool(MIN_POOL_WRITE
,
1544 if (nfs_wdata_mempool
== NULL
)
1547 nfs_commit_mempool
= mempool_create_slab_pool(MIN_POOL_COMMIT
,
1549 if (nfs_commit_mempool
== NULL
)
1555 void nfs_destroy_writepagecache(void)
1557 mempool_destroy(nfs_commit_mempool
);
1558 mempool_destroy(nfs_wdata_mempool
);
1559 kmem_cache_destroy(nfs_wdata_cachep
);