Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/write.c | |
3 | * | |
4 | * Writing file data over NFS. | |
5 | * | |
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. | |
12 | * | |
13 | * Just like readahead, no async I/O is performed if wsize < PAGE_SIZE. | |
14 | * | |
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. | |
20 | * | |
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. | |
24 | * | |
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 | |
27 | * cases: | |
28 | * | |
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 | |
32 | * | |
33 | * Also note that because of the way pages are invalidated in | |
34 | * nfs_revalidate_inode, the following assertions hold: | |
35 | * | |
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. | |
40 | * | |
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. | |
45 | * | |
46 | * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de> | |
47 | */ | |
48 | ||
1da177e4 LT |
49 | #include <linux/types.h> |
50 | #include <linux/slab.h> | |
51 | #include <linux/mm.h> | |
52 | #include <linux/pagemap.h> | |
53 | #include <linux/file.h> | |
54 | #include <linux/mpage.h> | |
55 | #include <linux/writeback.h> | |
56 | ||
57 | #include <linux/sunrpc/clnt.h> | |
58 | #include <linux/nfs_fs.h> | |
59 | #include <linux/nfs_mount.h> | |
60 | #include <linux/nfs_page.h> | |
61 | #include <asm/uaccess.h> | |
62 | #include <linux/smp_lock.h> | |
63 | ||
64 | #include "delegation.h" | |
91d5b470 | 65 | #include "iostat.h" |
1da177e4 LT |
66 | |
67 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE | |
68 | ||
69 | #define MIN_POOL_WRITE (32) | |
70 | #define MIN_POOL_COMMIT (4) | |
71 | ||
72 | /* | |
73 | * Local function declarations | |
74 | */ | |
75 | static struct nfs_page * nfs_update_request(struct nfs_open_context*, | |
76 | struct inode *, | |
77 | struct page *, | |
78 | unsigned int, unsigned int); | |
1da177e4 LT |
79 | static int nfs_wait_on_write_congestion(struct address_space *, int); |
80 | static int nfs_wait_on_requests(struct inode *, unsigned long, unsigned int); | |
81 | static int nfs_flush_inode(struct inode *inode, unsigned long idx_start, | |
82 | unsigned int npages, int how); | |
788e7a89 TM |
83 | static const struct rpc_call_ops nfs_write_partial_ops; |
84 | static const struct rpc_call_ops nfs_write_full_ops; | |
85 | static const struct rpc_call_ops nfs_commit_ops; | |
1da177e4 LT |
86 | |
87 | static kmem_cache_t *nfs_wdata_cachep; | |
3feb2d49 | 88 | static mempool_t *nfs_wdata_mempool; |
1da177e4 LT |
89 | static mempool_t *nfs_commit_mempool; |
90 | ||
91 | static DECLARE_WAIT_QUEUE_HEAD(nfs_write_congestion); | |
92 | ||
e9f7bee1 | 93 | struct nfs_write_data *nfs_commit_alloc(void) |
1da177e4 LT |
94 | { |
95 | struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, SLAB_NOFS); | |
40859d7e | 96 | |
1da177e4 LT |
97 | if (p) { |
98 | memset(p, 0, sizeof(*p)); | |
99 | INIT_LIST_HEAD(&p->pages); | |
100 | } | |
101 | return p; | |
102 | } | |
103 | ||
e17b1fc4 | 104 | void nfs_commit_free(struct nfs_write_data *p) |
1da177e4 | 105 | { |
40859d7e CL |
106 | if (p && (p->pagevec != &p->page_array[0])) |
107 | kfree(p->pagevec); | |
1da177e4 LT |
108 | mempool_free(p, nfs_commit_mempool); |
109 | } | |
110 | ||
e9f7bee1 | 111 | struct nfs_write_data *nfs_writedata_alloc(size_t len) |
3feb2d49 | 112 | { |
e9f7bee1 | 113 | unsigned int pagecount = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
3feb2d49 TM |
114 | struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, SLAB_NOFS); |
115 | ||
116 | if (p) { | |
117 | memset(p, 0, sizeof(*p)); | |
118 | INIT_LIST_HEAD(&p->pages); | |
e9f7bee1 | 119 | p->npages = pagecount; |
0d0b5cb3 CL |
120 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
121 | p->pagevec = p->page_array; | |
3feb2d49 | 122 | else { |
0d0b5cb3 CL |
123 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
124 | if (!p->pagevec) { | |
3feb2d49 TM |
125 | mempool_free(p, nfs_wdata_mempool); |
126 | p = NULL; | |
127 | } | |
128 | } | |
129 | } | |
130 | return p; | |
131 | } | |
132 | ||
e4e20512 | 133 | static void nfs_writedata_free(struct nfs_write_data *p) |
3feb2d49 TM |
134 | { |
135 | if (p && (p->pagevec != &p->page_array[0])) | |
136 | kfree(p->pagevec); | |
137 | mempool_free(p, nfs_wdata_mempool); | |
138 | } | |
139 | ||
963d8fe5 | 140 | void nfs_writedata_release(void *wdata) |
1da177e4 | 141 | { |
1da177e4 LT |
142 | nfs_writedata_free(wdata); |
143 | } | |
144 | ||
145 | /* Adjust the file length if we're writing beyond the end */ | |
146 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) | |
147 | { | |
148 | struct inode *inode = page->mapping->host; | |
149 | loff_t end, i_size = i_size_read(inode); | |
150 | unsigned long end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; | |
151 | ||
152 | if (i_size > 0 && page->index < end_index) | |
153 | return; | |
154 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); | |
155 | if (i_size >= end) | |
156 | return; | |
91d5b470 | 157 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
1da177e4 LT |
158 | i_size_write(inode, end); |
159 | } | |
160 | ||
161 | /* We can set the PG_uptodate flag if we see that a write request | |
162 | * covers the full page. | |
163 | */ | |
164 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) | |
165 | { | |
166 | loff_t end_offs; | |
167 | ||
168 | if (PageUptodate(page)) | |
169 | return; | |
170 | if (base != 0) | |
171 | return; | |
172 | if (count == PAGE_CACHE_SIZE) { | |
173 | SetPageUptodate(page); | |
174 | return; | |
175 | } | |
176 | ||
177 | end_offs = i_size_read(page->mapping->host) - 1; | |
178 | if (end_offs < 0) | |
179 | return; | |
180 | /* Is this the last page? */ | |
181 | if (page->index != (unsigned long)(end_offs >> PAGE_CACHE_SHIFT)) | |
182 | return; | |
183 | /* This is the last page: set PG_uptodate if we cover the entire | |
184 | * extent of the data, then zero the rest of the page. | |
185 | */ | |
186 | if (count == (unsigned int)(end_offs & (PAGE_CACHE_SIZE - 1)) + 1) { | |
187 | memclear_highpage_flush(page, count, PAGE_CACHE_SIZE - count); | |
188 | SetPageUptodate(page); | |
189 | } | |
190 | } | |
191 | ||
192 | /* | |
193 | * Write a page synchronously. | |
194 | * Offset is the data offset within the page. | |
195 | */ | |
196 | static int nfs_writepage_sync(struct nfs_open_context *ctx, struct inode *inode, | |
197 | struct page *page, unsigned int offset, unsigned int count, | |
198 | int how) | |
199 | { | |
200 | unsigned int wsize = NFS_SERVER(inode)->wsize; | |
201 | int result, written = 0; | |
202 | struct nfs_write_data *wdata; | |
203 | ||
e9f7bee1 | 204 | wdata = nfs_writedata_alloc(wsize); |
1da177e4 LT |
205 | if (!wdata) |
206 | return -ENOMEM; | |
207 | ||
208 | wdata->flags = how; | |
209 | wdata->cred = ctx->cred; | |
210 | wdata->inode = inode; | |
211 | wdata->args.fh = NFS_FH(inode); | |
212 | wdata->args.context = ctx; | |
213 | wdata->args.pages = &page; | |
214 | wdata->args.stable = NFS_FILE_SYNC; | |
215 | wdata->args.pgbase = offset; | |
216 | wdata->args.count = wsize; | |
217 | wdata->res.fattr = &wdata->fattr; | |
218 | wdata->res.verf = &wdata->verf; | |
219 | ||
220 | dprintk("NFS: nfs_writepage_sync(%s/%Ld %d@%Ld)\n", | |
221 | inode->i_sb->s_id, | |
222 | (long long)NFS_FILEID(inode), | |
223 | count, (long long)(page_offset(page) + offset)); | |
224 | ||
bb713d6d | 225 | set_page_writeback(page); |
1da177e4 LT |
226 | nfs_begin_data_update(inode); |
227 | do { | |
228 | if (count < wsize) | |
229 | wdata->args.count = count; | |
230 | wdata->args.offset = page_offset(page) + wdata->args.pgbase; | |
231 | ||
232 | result = NFS_PROTO(inode)->write(wdata); | |
233 | ||
234 | if (result < 0) { | |
235 | /* Must mark the page invalid after I/O error */ | |
236 | ClearPageUptodate(page); | |
237 | goto io_error; | |
238 | } | |
239 | if (result < wdata->args.count) | |
240 | printk(KERN_WARNING "NFS: short write, count=%u, result=%d\n", | |
241 | wdata->args.count, result); | |
242 | ||
243 | wdata->args.offset += result; | |
244 | wdata->args.pgbase += result; | |
245 | written += result; | |
246 | count -= result; | |
91d5b470 | 247 | nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, result); |
1da177e4 LT |
248 | } while (count); |
249 | /* Update file length */ | |
250 | nfs_grow_file(page, offset, written); | |
251 | /* Set the PG_uptodate flag? */ | |
252 | nfs_mark_uptodate(page, offset, written); | |
253 | ||
254 | if (PageError(page)) | |
255 | ClearPageError(page); | |
256 | ||
257 | io_error: | |
951a143b | 258 | nfs_end_data_update(inode); |
bb713d6d | 259 | end_page_writeback(page); |
1da177e4 LT |
260 | nfs_writedata_free(wdata); |
261 | return written ? written : result; | |
262 | } | |
263 | ||
264 | static int nfs_writepage_async(struct nfs_open_context *ctx, | |
265 | struct inode *inode, struct page *page, | |
266 | unsigned int offset, unsigned int count) | |
267 | { | |
268 | struct nfs_page *req; | |
1da177e4 LT |
269 | |
270 | req = nfs_update_request(ctx, inode, page, offset, count); | |
abd3e641 TM |
271 | if (IS_ERR(req)) |
272 | return PTR_ERR(req); | |
1da177e4 LT |
273 | /* Update file length */ |
274 | nfs_grow_file(page, offset, count); | |
275 | /* Set the PG_uptodate flag? */ | |
276 | nfs_mark_uptodate(page, offset, count); | |
277 | nfs_unlock_request(req); | |
abd3e641 | 278 | return 0; |
1da177e4 LT |
279 | } |
280 | ||
281 | static int wb_priority(struct writeback_control *wbc) | |
282 | { | |
283 | if (wbc->for_reclaim) | |
284 | return FLUSH_HIGHPRI; | |
285 | if (wbc->for_kupdate) | |
286 | return FLUSH_LOWPRI; | |
287 | return 0; | |
288 | } | |
289 | ||
290 | /* | |
291 | * Write an mmapped page to the server. | |
292 | */ | |
293 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
294 | { | |
295 | struct nfs_open_context *ctx; | |
296 | struct inode *inode = page->mapping->host; | |
297 | unsigned long end_index; | |
298 | unsigned offset = PAGE_CACHE_SIZE; | |
299 | loff_t i_size = i_size_read(inode); | |
300 | int inode_referenced = 0; | |
301 | int priority = wb_priority(wbc); | |
302 | int err; | |
303 | ||
91d5b470 CL |
304 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
305 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
306 | ||
1da177e4 LT |
307 | /* |
308 | * Note: We need to ensure that we have a reference to the inode | |
309 | * if we are to do asynchronous writes. If not, waiting | |
310 | * in nfs_wait_on_request() may deadlock with clear_inode(). | |
311 | * | |
312 | * If igrab() fails here, then it is in any case safe to | |
313 | * call nfs_wb_page(), since there will be no pending writes. | |
314 | */ | |
315 | if (igrab(inode) != 0) | |
316 | inode_referenced = 1; | |
317 | end_index = i_size >> PAGE_CACHE_SHIFT; | |
318 | ||
319 | /* Ensure we've flushed out any previous writes */ | |
320 | nfs_wb_page_priority(inode, page, priority); | |
321 | ||
322 | /* easy case */ | |
323 | if (page->index < end_index) | |
324 | goto do_it; | |
325 | /* things got complicated... */ | |
326 | offset = i_size & (PAGE_CACHE_SIZE-1); | |
327 | ||
328 | /* OK, are we completely out? */ | |
329 | err = 0; /* potential race with truncate - ignore */ | |
330 | if (page->index >= end_index+1 || !offset) | |
331 | goto out; | |
332 | do_it: | |
d530838b | 333 | ctx = nfs_find_open_context(inode, NULL, FMODE_WRITE); |
1da177e4 LT |
334 | if (ctx == NULL) { |
335 | err = -EBADF; | |
336 | goto out; | |
337 | } | |
338 | lock_kernel(); | |
339 | if (!IS_SYNC(inode) && inode_referenced) { | |
340 | err = nfs_writepage_async(ctx, inode, page, 0, offset); | |
abd3e641 TM |
341 | if (!wbc->for_writepages) |
342 | nfs_flush_inode(inode, 0, 0, wb_priority(wbc)); | |
1da177e4 LT |
343 | } else { |
344 | err = nfs_writepage_sync(ctx, inode, page, 0, | |
345 | offset, priority); | |
346 | if (err >= 0) { | |
347 | if (err != offset) | |
348 | redirty_page_for_writepage(wbc, page); | |
349 | err = 0; | |
350 | } | |
351 | } | |
352 | unlock_kernel(); | |
353 | put_nfs_open_context(ctx); | |
354 | out: | |
355 | unlock_page(page); | |
356 | if (inode_referenced) | |
357 | iput(inode); | |
358 | return err; | |
359 | } | |
360 | ||
361 | /* | |
362 | * Note: causes nfs_update_request() to block on the assumption | |
363 | * that the writeback is generated due to memory pressure. | |
364 | */ | |
365 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) | |
366 | { | |
367 | struct backing_dev_info *bdi = mapping->backing_dev_info; | |
368 | struct inode *inode = mapping->host; | |
369 | int err; | |
370 | ||
91d5b470 CL |
371 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
372 | ||
1da177e4 LT |
373 | err = generic_writepages(mapping, wbc); |
374 | if (err) | |
375 | return err; | |
376 | while (test_and_set_bit(BDI_write_congested, &bdi->state) != 0) { | |
377 | if (wbc->nonblocking) | |
378 | return 0; | |
379 | nfs_wait_on_write_congestion(mapping, 0); | |
380 | } | |
381 | err = nfs_flush_inode(inode, 0, 0, wb_priority(wbc)); | |
382 | if (err < 0) | |
383 | goto out; | |
91d5b470 | 384 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, err); |
1da177e4 LT |
385 | wbc->nr_to_write -= err; |
386 | if (!wbc->nonblocking && wbc->sync_mode == WB_SYNC_ALL) { | |
387 | err = nfs_wait_on_requests(inode, 0, 0); | |
388 | if (err < 0) | |
389 | goto out; | |
390 | } | |
3da28eb1 | 391 | err = nfs_commit_inode(inode, wb_priority(wbc)); |
1da177e4 LT |
392 | if (err > 0) { |
393 | wbc->nr_to_write -= err; | |
394 | err = 0; | |
395 | } | |
396 | out: | |
397 | clear_bit(BDI_write_congested, &bdi->state); | |
398 | wake_up_all(&nfs_write_congestion); | |
275a082f | 399 | writeback_congestion_end(); |
1da177e4 LT |
400 | return err; |
401 | } | |
402 | ||
403 | /* | |
404 | * Insert a write request into an inode | |
405 | */ | |
406 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) | |
407 | { | |
408 | struct nfs_inode *nfsi = NFS_I(inode); | |
409 | int error; | |
410 | ||
411 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); | |
412 | BUG_ON(error == -EEXIST); | |
413 | if (error) | |
414 | return error; | |
415 | if (!nfsi->npages) { | |
416 | igrab(inode); | |
417 | nfs_begin_data_update(inode); | |
418 | if (nfs_have_delegation(inode, FMODE_WRITE)) | |
419 | nfsi->change_attr++; | |
420 | } | |
deb7d638 | 421 | SetPagePrivate(req->wb_page); |
1da177e4 LT |
422 | nfsi->npages++; |
423 | atomic_inc(&req->wb_count); | |
424 | return 0; | |
425 | } | |
426 | ||
427 | /* | |
428 | * Insert a write request into an inode | |
429 | */ | |
430 | static void nfs_inode_remove_request(struct nfs_page *req) | |
431 | { | |
432 | struct inode *inode = req->wb_context->dentry->d_inode; | |
433 | struct nfs_inode *nfsi = NFS_I(inode); | |
434 | ||
435 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
436 | ||
437 | spin_lock(&nfsi->req_lock); | |
deb7d638 | 438 | ClearPagePrivate(req->wb_page); |
1da177e4 LT |
439 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
440 | nfsi->npages--; | |
441 | if (!nfsi->npages) { | |
442 | spin_unlock(&nfsi->req_lock); | |
951a143b | 443 | nfs_end_data_update(inode); |
1da177e4 LT |
444 | iput(inode); |
445 | } else | |
446 | spin_unlock(&nfsi->req_lock); | |
447 | nfs_clear_request(req); | |
448 | nfs_release_request(req); | |
449 | } | |
450 | ||
451 | /* | |
452 | * Find a request | |
453 | */ | |
454 | static inline struct nfs_page * | |
455 | _nfs_find_request(struct inode *inode, unsigned long index) | |
456 | { | |
457 | struct nfs_inode *nfsi = NFS_I(inode); | |
458 | struct nfs_page *req; | |
459 | ||
460 | req = (struct nfs_page*)radix_tree_lookup(&nfsi->nfs_page_tree, index); | |
461 | if (req) | |
462 | atomic_inc(&req->wb_count); | |
463 | return req; | |
464 | } | |
465 | ||
466 | static struct nfs_page * | |
467 | nfs_find_request(struct inode *inode, unsigned long index) | |
468 | { | |
469 | struct nfs_page *req; | |
470 | struct nfs_inode *nfsi = NFS_I(inode); | |
471 | ||
472 | spin_lock(&nfsi->req_lock); | |
473 | req = _nfs_find_request(inode, index); | |
474 | spin_unlock(&nfsi->req_lock); | |
475 | return req; | |
476 | } | |
477 | ||
478 | /* | |
479 | * Add a request to the inode's dirty list. | |
480 | */ | |
481 | static void | |
482 | nfs_mark_request_dirty(struct nfs_page *req) | |
483 | { | |
484 | struct inode *inode = req->wb_context->dentry->d_inode; | |
485 | struct nfs_inode *nfsi = NFS_I(inode); | |
486 | ||
487 | spin_lock(&nfsi->req_lock); | |
3da28eb1 TM |
488 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
489 | req->wb_index, NFS_PAGE_TAG_DIRTY); | |
1da177e4 LT |
490 | nfs_list_add_request(req, &nfsi->dirty); |
491 | nfsi->ndirty++; | |
492 | spin_unlock(&nfsi->req_lock); | |
b1e7a8fd | 493 | inc_zone_page_state(req->wb_page, NR_FILE_DIRTY); |
1da177e4 LT |
494 | mark_inode_dirty(inode); |
495 | } | |
496 | ||
497 | /* | |
498 | * Check if a request is dirty | |
499 | */ | |
500 | static inline int | |
501 | nfs_dirty_request(struct nfs_page *req) | |
502 | { | |
503 | struct nfs_inode *nfsi = NFS_I(req->wb_context->dentry->d_inode); | |
504 | return !list_empty(&req->wb_list) && req->wb_list_head == &nfsi->dirty; | |
505 | } | |
506 | ||
507 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
508 | /* | |
509 | * Add a request to the inode's commit list. | |
510 | */ | |
511 | static void | |
512 | nfs_mark_request_commit(struct nfs_page *req) | |
513 | { | |
514 | struct inode *inode = req->wb_context->dentry->d_inode; | |
515 | struct nfs_inode *nfsi = NFS_I(inode); | |
516 | ||
517 | spin_lock(&nfsi->req_lock); | |
518 | nfs_list_add_request(req, &nfsi->commit); | |
519 | nfsi->ncommit++; | |
520 | spin_unlock(&nfsi->req_lock); | |
fd39fc85 | 521 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
1da177e4 LT |
522 | mark_inode_dirty(inode); |
523 | } | |
524 | #endif | |
525 | ||
526 | /* | |
527 | * Wait for a request to complete. | |
528 | * | |
529 | * Interruptible by signals only if mounted with intr flag. | |
530 | */ | |
c42de9dd | 531 | static int nfs_wait_on_requests_locked(struct inode *inode, unsigned long idx_start, unsigned int npages) |
1da177e4 LT |
532 | { |
533 | struct nfs_inode *nfsi = NFS_I(inode); | |
534 | struct nfs_page *req; | |
535 | unsigned long idx_end, next; | |
536 | unsigned int res = 0; | |
537 | int error; | |
538 | ||
539 | if (npages == 0) | |
540 | idx_end = ~0; | |
541 | else | |
542 | idx_end = idx_start + npages - 1; | |
543 | ||
1da177e4 | 544 | next = idx_start; |
c6a556b8 | 545 | while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_WRITEBACK)) { |
1da177e4 LT |
546 | if (req->wb_index > idx_end) |
547 | break; | |
548 | ||
549 | next = req->wb_index + 1; | |
c6a556b8 | 550 | BUG_ON(!NFS_WBACK_BUSY(req)); |
1da177e4 LT |
551 | |
552 | atomic_inc(&req->wb_count); | |
553 | spin_unlock(&nfsi->req_lock); | |
554 | error = nfs_wait_on_request(req); | |
555 | nfs_release_request(req); | |
c42de9dd | 556 | spin_lock(&nfsi->req_lock); |
1da177e4 LT |
557 | if (error < 0) |
558 | return error; | |
1da177e4 LT |
559 | res++; |
560 | } | |
1da177e4 LT |
561 | return res; |
562 | } | |
563 | ||
c42de9dd TM |
564 | static int nfs_wait_on_requests(struct inode *inode, unsigned long idx_start, unsigned int npages) |
565 | { | |
566 | struct nfs_inode *nfsi = NFS_I(inode); | |
567 | int ret; | |
568 | ||
569 | spin_lock(&nfsi->req_lock); | |
570 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); | |
571 | spin_unlock(&nfsi->req_lock); | |
572 | return ret; | |
573 | } | |
574 | ||
83715ad5 | 575 | static void nfs_cancel_dirty_list(struct list_head *head) |
d2ccddf0 TM |
576 | { |
577 | struct nfs_page *req; | |
578 | while(!list_empty(head)) { | |
579 | req = nfs_list_entry(head->next); | |
580 | nfs_list_remove_request(req); | |
581 | nfs_inode_remove_request(req); | |
582 | nfs_clear_page_writeback(req); | |
583 | } | |
584 | } | |
585 | ||
83715ad5 TM |
586 | static void nfs_cancel_commit_list(struct list_head *head) |
587 | { | |
588 | struct nfs_page *req; | |
589 | ||
590 | while(!list_empty(head)) { | |
591 | req = nfs_list_entry(head->next); | |
592 | nfs_list_remove_request(req); | |
593 | nfs_inode_remove_request(req); | |
83715ad5 | 594 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
5c2d97cb | 595 | nfs_clear_page_writeback(req); |
83715ad5 TM |
596 | } |
597 | } | |
598 | ||
1da177e4 LT |
599 | /* |
600 | * nfs_scan_dirty - Scan an inode for dirty requests | |
601 | * @inode: NFS inode to scan | |
602 | * @dst: destination list | |
603 | * @idx_start: lower bound of page->index to scan. | |
604 | * @npages: idx_start + npages sets the upper bound to scan. | |
605 | * | |
606 | * Moves requests from the inode's dirty page list. | |
607 | * The requests are *not* checked to ensure that they form a contiguous set. | |
608 | */ | |
609 | static int | |
610 | nfs_scan_dirty(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
611 | { | |
612 | struct nfs_inode *nfsi = NFS_I(inode); | |
3da28eb1 TM |
613 | int res = 0; |
614 | ||
615 | if (nfsi->ndirty != 0) { | |
616 | res = nfs_scan_lock_dirty(nfsi, dst, idx_start, npages); | |
617 | nfsi->ndirty -= res; | |
3da28eb1 TM |
618 | if ((nfsi->ndirty == 0) != list_empty(&nfsi->dirty)) |
619 | printk(KERN_ERR "NFS: desynchronized value of nfs_i.ndirty.\n"); | |
620 | } | |
1da177e4 LT |
621 | return res; |
622 | } | |
623 | ||
624 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
625 | /* | |
626 | * nfs_scan_commit - Scan an inode for commit requests | |
627 | * @inode: NFS inode to scan | |
628 | * @dst: destination list | |
629 | * @idx_start: lower bound of page->index to scan. | |
630 | * @npages: idx_start + npages sets the upper bound to scan. | |
631 | * | |
632 | * Moves requests from the inode's 'commit' request list. | |
633 | * The requests are *not* checked to ensure that they form a contiguous set. | |
634 | */ | |
635 | static int | |
636 | nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
637 | { | |
638 | struct nfs_inode *nfsi = NFS_I(inode); | |
3da28eb1 TM |
639 | int res = 0; |
640 | ||
641 | if (nfsi->ncommit != 0) { | |
d2ccddf0 | 642 | res = nfs_scan_list(nfsi, &nfsi->commit, dst, idx_start, npages); |
3da28eb1 TM |
643 | nfsi->ncommit -= res; |
644 | if ((nfsi->ncommit == 0) != list_empty(&nfsi->commit)) | |
645 | printk(KERN_ERR "NFS: desynchronized value of nfs_i.ncommit.\n"); | |
646 | } | |
1da177e4 LT |
647 | return res; |
648 | } | |
c42de9dd TM |
649 | #else |
650 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
651 | { | |
652 | return 0; | |
653 | } | |
1da177e4 LT |
654 | #endif |
655 | ||
656 | static int nfs_wait_on_write_congestion(struct address_space *mapping, int intr) | |
657 | { | |
658 | struct backing_dev_info *bdi = mapping->backing_dev_info; | |
659 | DEFINE_WAIT(wait); | |
660 | int ret = 0; | |
661 | ||
662 | might_sleep(); | |
663 | ||
664 | if (!bdi_write_congested(bdi)) | |
665 | return 0; | |
91d5b470 CL |
666 | |
667 | nfs_inc_stats(mapping->host, NFSIOS_CONGESTIONWAIT); | |
668 | ||
1da177e4 LT |
669 | if (intr) { |
670 | struct rpc_clnt *clnt = NFS_CLIENT(mapping->host); | |
671 | sigset_t oldset; | |
672 | ||
673 | rpc_clnt_sigmask(clnt, &oldset); | |
674 | prepare_to_wait(&nfs_write_congestion, &wait, TASK_INTERRUPTIBLE); | |
675 | if (bdi_write_congested(bdi)) { | |
676 | if (signalled()) | |
677 | ret = -ERESTARTSYS; | |
678 | else | |
679 | schedule(); | |
680 | } | |
681 | rpc_clnt_sigunmask(clnt, &oldset); | |
682 | } else { | |
683 | prepare_to_wait(&nfs_write_congestion, &wait, TASK_UNINTERRUPTIBLE); | |
684 | if (bdi_write_congested(bdi)) | |
685 | schedule(); | |
686 | } | |
687 | finish_wait(&nfs_write_congestion, &wait); | |
688 | return ret; | |
689 | } | |
690 | ||
691 | ||
692 | /* | |
693 | * Try to update any existing write request, or create one if there is none. | |
694 | * In order to match, the request's credentials must match those of | |
695 | * the calling process. | |
696 | * | |
697 | * Note: Should always be called with the Page Lock held! | |
698 | */ | |
699 | static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, | |
700 | struct inode *inode, struct page *page, | |
701 | unsigned int offset, unsigned int bytes) | |
702 | { | |
703 | struct nfs_server *server = NFS_SERVER(inode); | |
704 | struct nfs_inode *nfsi = NFS_I(inode); | |
705 | struct nfs_page *req, *new = NULL; | |
706 | unsigned long rqend, end; | |
707 | ||
708 | end = offset + bytes; | |
709 | ||
710 | if (nfs_wait_on_write_congestion(page->mapping, server->flags & NFS_MOUNT_INTR)) | |
711 | return ERR_PTR(-ERESTARTSYS); | |
712 | for (;;) { | |
713 | /* Loop over all inode entries and see if we find | |
714 | * A request for the page we wish to update | |
715 | */ | |
716 | spin_lock(&nfsi->req_lock); | |
717 | req = _nfs_find_request(inode, page->index); | |
718 | if (req) { | |
719 | if (!nfs_lock_request_dontget(req)) { | |
720 | int error; | |
721 | spin_unlock(&nfsi->req_lock); | |
722 | error = nfs_wait_on_request(req); | |
723 | nfs_release_request(req); | |
1dd594b2 NB |
724 | if (error < 0) { |
725 | if (new) | |
726 | nfs_release_request(new); | |
1da177e4 | 727 | return ERR_PTR(error); |
1dd594b2 | 728 | } |
1da177e4 LT |
729 | continue; |
730 | } | |
731 | spin_unlock(&nfsi->req_lock); | |
732 | if (new) | |
733 | nfs_release_request(new); | |
734 | break; | |
735 | } | |
736 | ||
737 | if (new) { | |
738 | int error; | |
739 | nfs_lock_request_dontget(new); | |
740 | error = nfs_inode_add_request(inode, new); | |
741 | if (error) { | |
742 | spin_unlock(&nfsi->req_lock); | |
743 | nfs_unlock_request(new); | |
744 | return ERR_PTR(error); | |
745 | } | |
746 | spin_unlock(&nfsi->req_lock); | |
747 | nfs_mark_request_dirty(new); | |
748 | return new; | |
749 | } | |
750 | spin_unlock(&nfsi->req_lock); | |
751 | ||
752 | new = nfs_create_request(ctx, inode, page, offset, bytes); | |
753 | if (IS_ERR(new)) | |
754 | return new; | |
755 | } | |
756 | ||
757 | /* We have a request for our page. | |
758 | * If the creds don't match, or the | |
759 | * page addresses don't match, | |
760 | * tell the caller to wait on the conflicting | |
761 | * request. | |
762 | */ | |
763 | rqend = req->wb_offset + req->wb_bytes; | |
764 | if (req->wb_context != ctx | |
765 | || req->wb_page != page | |
766 | || !nfs_dirty_request(req) | |
767 | || offset > rqend || end < req->wb_offset) { | |
768 | nfs_unlock_request(req); | |
769 | return ERR_PTR(-EBUSY); | |
770 | } | |
771 | ||
772 | /* Okay, the request matches. Update the region */ | |
773 | if (offset < req->wb_offset) { | |
774 | req->wb_offset = offset; | |
775 | req->wb_pgbase = offset; | |
776 | req->wb_bytes = rqend - req->wb_offset; | |
777 | } | |
778 | ||
779 | if (end > rqend) | |
780 | req->wb_bytes = end - req->wb_offset; | |
781 | ||
782 | return req; | |
783 | } | |
784 | ||
785 | int nfs_flush_incompatible(struct file *file, struct page *page) | |
786 | { | |
787 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
788 | struct inode *inode = page->mapping->host; | |
789 | struct nfs_page *req; | |
790 | int status = 0; | |
791 | /* | |
792 | * Look for a request corresponding to this page. If there | |
793 | * is one, and it belongs to another file, we flush it out | |
794 | * before we try to copy anything into the page. Do this | |
795 | * due to the lack of an ACCESS-type call in NFSv2. | |
796 | * Also do the same if we find a request from an existing | |
797 | * dropped page. | |
798 | */ | |
799 | req = nfs_find_request(inode, page->index); | |
800 | if (req) { | |
801 | if (req->wb_page != page || ctx != req->wb_context) | |
802 | status = nfs_wb_page(inode, page); | |
803 | nfs_release_request(req); | |
804 | } | |
805 | return (status < 0) ? status : 0; | |
806 | } | |
807 | ||
808 | /* | |
809 | * Update and possibly write a cached page of an NFS file. | |
810 | * | |
811 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
812 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
813 | */ | |
814 | int nfs_updatepage(struct file *file, struct page *page, | |
815 | unsigned int offset, unsigned int count) | |
816 | { | |
817 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 LT |
818 | struct inode *inode = page->mapping->host; |
819 | struct nfs_page *req; | |
820 | int status = 0; | |
821 | ||
91d5b470 CL |
822 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
823 | ||
1da177e4 | 824 | dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", |
0bbacc40 CL |
825 | file->f_dentry->d_parent->d_name.name, |
826 | file->f_dentry->d_name.name, count, | |
827 | (long long)(page_offset(page) +offset)); | |
1da177e4 LT |
828 | |
829 | if (IS_SYNC(inode)) { | |
830 | status = nfs_writepage_sync(ctx, inode, page, offset, count, 0); | |
831 | if (status > 0) { | |
832 | if (offset == 0 && status == PAGE_CACHE_SIZE) | |
833 | SetPageUptodate(page); | |
834 | return 0; | |
835 | } | |
836 | return status; | |
837 | } | |
838 | ||
839 | /* If we're not using byte range locks, and we know the page | |
840 | * is entirely in cache, it may be more efficient to avoid | |
841 | * fragmenting write requests. | |
842 | */ | |
ab0a3dbe | 843 | if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) { |
1da177e4 LT |
844 | loff_t end_offs = i_size_read(inode) - 1; |
845 | unsigned long end_index = end_offs >> PAGE_CACHE_SHIFT; | |
846 | ||
847 | count += offset; | |
848 | offset = 0; | |
849 | if (unlikely(end_offs < 0)) { | |
850 | /* Do nothing */ | |
851 | } else if (page->index == end_index) { | |
852 | unsigned int pglen; | |
853 | pglen = (unsigned int)(end_offs & (PAGE_CACHE_SIZE-1)) + 1; | |
854 | if (count < pglen) | |
855 | count = pglen; | |
856 | } else if (page->index < end_index) | |
857 | count = PAGE_CACHE_SIZE; | |
858 | } | |
859 | ||
860 | /* | |
861 | * Try to find an NFS request corresponding to this page | |
862 | * and update it. | |
863 | * If the existing request cannot be updated, we must flush | |
864 | * it out now. | |
865 | */ | |
866 | do { | |
867 | req = nfs_update_request(ctx, inode, page, offset, count); | |
868 | status = (IS_ERR(req)) ? PTR_ERR(req) : 0; | |
869 | if (status != -EBUSY) | |
870 | break; | |
871 | /* Request could not be updated. Flush it out and try again */ | |
872 | status = nfs_wb_page(inode, page); | |
873 | } while (status >= 0); | |
874 | if (status < 0) | |
875 | goto done; | |
876 | ||
877 | status = 0; | |
878 | ||
879 | /* Update file length */ | |
880 | nfs_grow_file(page, offset, count); | |
881 | /* Set the PG_uptodate flag? */ | |
882 | nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); | |
883 | nfs_unlock_request(req); | |
884 | done: | |
885 | dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", | |
886 | status, (long long)i_size_read(inode)); | |
887 | if (status < 0) | |
888 | ClearPageUptodate(page); | |
889 | return status; | |
890 | } | |
891 | ||
892 | static void nfs_writepage_release(struct nfs_page *req) | |
893 | { | |
894 | end_page_writeback(req->wb_page); | |
895 | ||
896 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
897 | if (!PageError(req->wb_page)) { | |
898 | if (NFS_NEED_RESCHED(req)) { | |
899 | nfs_mark_request_dirty(req); | |
900 | goto out; | |
901 | } else if (NFS_NEED_COMMIT(req)) { | |
902 | nfs_mark_request_commit(req); | |
903 | goto out; | |
904 | } | |
905 | } | |
906 | nfs_inode_remove_request(req); | |
907 | ||
908 | out: | |
909 | nfs_clear_commit(req); | |
910 | nfs_clear_reschedule(req); | |
911 | #else | |
912 | nfs_inode_remove_request(req); | |
913 | #endif | |
c6a556b8 | 914 | nfs_clear_page_writeback(req); |
1da177e4 LT |
915 | } |
916 | ||
917 | static inline int flush_task_priority(int how) | |
918 | { | |
919 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
920 | case FLUSH_HIGHPRI: | |
921 | return RPC_PRIORITY_HIGH; | |
922 | case FLUSH_LOWPRI: | |
923 | return RPC_PRIORITY_LOW; | |
924 | } | |
925 | return RPC_PRIORITY_NORMAL; | |
926 | } | |
927 | ||
928 | /* | |
929 | * Set up the argument/result storage required for the RPC call. | |
930 | */ | |
931 | static void nfs_write_rpcsetup(struct nfs_page *req, | |
932 | struct nfs_write_data *data, | |
788e7a89 | 933 | const struct rpc_call_ops *call_ops, |
1da177e4 LT |
934 | unsigned int count, unsigned int offset, |
935 | int how) | |
936 | { | |
1da177e4 | 937 | struct inode *inode; |
788e7a89 | 938 | int flags; |
1da177e4 LT |
939 | |
940 | /* Set up the RPC argument and reply structs | |
941 | * NB: take care not to mess about with data->commit et al. */ | |
942 | ||
943 | data->req = req; | |
944 | data->inode = inode = req->wb_context->dentry->d_inode; | |
945 | data->cred = req->wb_context->cred; | |
946 | ||
947 | data->args.fh = NFS_FH(inode); | |
948 | data->args.offset = req_offset(req) + offset; | |
949 | data->args.pgbase = req->wb_pgbase + offset; | |
950 | data->args.pages = data->pagevec; | |
951 | data->args.count = count; | |
952 | data->args.context = req->wb_context; | |
953 | ||
954 | data->res.fattr = &data->fattr; | |
955 | data->res.count = count; | |
956 | data->res.verf = &data->verf; | |
0e574af1 | 957 | nfs_fattr_init(&data->fattr); |
1da177e4 | 958 | |
788e7a89 TM |
959 | /* Set up the initial task struct. */ |
960 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
961 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data); | |
1da177e4 LT |
962 | NFS_PROTO(inode)->write_setup(data, how); |
963 | ||
964 | data->task.tk_priority = flush_task_priority(how); | |
965 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 LT |
966 | |
967 | dprintk("NFS: %4d initiated write call (req %s/%Ld, %u bytes @ offset %Lu)\n", | |
0bbacc40 | 968 | data->task.tk_pid, |
1da177e4 LT |
969 | inode->i_sb->s_id, |
970 | (long long)NFS_FILEID(inode), | |
971 | count, | |
972 | (unsigned long long)data->args.offset); | |
973 | } | |
974 | ||
975 | static void nfs_execute_write(struct nfs_write_data *data) | |
976 | { | |
977 | struct rpc_clnt *clnt = NFS_CLIENT(data->inode); | |
978 | sigset_t oldset; | |
979 | ||
980 | rpc_clnt_sigmask(clnt, &oldset); | |
981 | lock_kernel(); | |
982 | rpc_execute(&data->task); | |
983 | unlock_kernel(); | |
984 | rpc_clnt_sigunmask(clnt, &oldset); | |
985 | } | |
986 | ||
987 | /* | |
988 | * Generate multiple small requests to write out a single | |
989 | * contiguous dirty area on one page. | |
990 | */ | |
7d46a49f | 991 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
992 | { |
993 | struct nfs_page *req = nfs_list_entry(head->next); | |
994 | struct page *page = req->wb_page; | |
995 | struct nfs_write_data *data; | |
e9f7bee1 TM |
996 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
997 | unsigned int offset; | |
1da177e4 LT |
998 | int requests = 0; |
999 | LIST_HEAD(list); | |
1000 | ||
1001 | nfs_list_remove_request(req); | |
1002 | ||
1003 | nbytes = req->wb_bytes; | |
e9f7bee1 TM |
1004 | do { |
1005 | size_t len = min(nbytes, wsize); | |
1006 | ||
1007 | data = nfs_writedata_alloc(len); | |
1da177e4 LT |
1008 | if (!data) |
1009 | goto out_bad; | |
1010 | list_add(&data->pages, &list); | |
1011 | requests++; | |
e9f7bee1 TM |
1012 | nbytes -= len; |
1013 | } while (nbytes != 0); | |
1da177e4 LT |
1014 | atomic_set(&req->wb_complete, requests); |
1015 | ||
1016 | ClearPageError(page); | |
bb713d6d | 1017 | set_page_writeback(page); |
1da177e4 LT |
1018 | offset = 0; |
1019 | nbytes = req->wb_bytes; | |
1020 | do { | |
1021 | data = list_entry(list.next, struct nfs_write_data, pages); | |
1022 | list_del_init(&data->pages); | |
1023 | ||
1024 | data->pagevec[0] = page; | |
1da177e4 LT |
1025 | |
1026 | if (nbytes > wsize) { | |
788e7a89 TM |
1027 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
1028 | wsize, offset, how); | |
1da177e4 LT |
1029 | offset += wsize; |
1030 | nbytes -= wsize; | |
1031 | } else { | |
788e7a89 TM |
1032 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
1033 | nbytes, offset, how); | |
1da177e4 LT |
1034 | nbytes = 0; |
1035 | } | |
1036 | nfs_execute_write(data); | |
1037 | } while (nbytes != 0); | |
1038 | ||
1039 | return 0; | |
1040 | ||
1041 | out_bad: | |
1042 | while (!list_empty(&list)) { | |
1043 | data = list_entry(list.next, struct nfs_write_data, pages); | |
1044 | list_del(&data->pages); | |
1045 | nfs_writedata_free(data); | |
1046 | } | |
1047 | nfs_mark_request_dirty(req); | |
c6a556b8 | 1048 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1049 | return -ENOMEM; |
1050 | } | |
1051 | ||
1052 | /* | |
1053 | * Create an RPC task for the given write request and kick it. | |
1054 | * The page must have been locked by the caller. | |
1055 | * | |
1056 | * It may happen that the page we're passed is not marked dirty. | |
1057 | * This is the case if nfs_updatepage detects a conflicting request | |
1058 | * that has been written but not committed. | |
1059 | */ | |
7d46a49f | 1060 | static int nfs_flush_one(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1061 | { |
1062 | struct nfs_page *req; | |
1063 | struct page **pages; | |
1064 | struct nfs_write_data *data; | |
1065 | unsigned int count; | |
1066 | ||
e9f7bee1 | 1067 | data = nfs_writedata_alloc(NFS_SERVER(inode)->wsize); |
1da177e4 LT |
1068 | if (!data) |
1069 | goto out_bad; | |
1070 | ||
1071 | pages = data->pagevec; | |
1072 | count = 0; | |
1073 | while (!list_empty(head)) { | |
1074 | req = nfs_list_entry(head->next); | |
1075 | nfs_list_remove_request(req); | |
1076 | nfs_list_add_request(req, &data->pages); | |
1077 | ClearPageError(req->wb_page); | |
bb713d6d | 1078 | set_page_writeback(req->wb_page); |
1da177e4 LT |
1079 | *pages++ = req->wb_page; |
1080 | count += req->wb_bytes; | |
1081 | } | |
1082 | req = nfs_list_entry(data->pages.next); | |
1083 | ||
1da177e4 | 1084 | /* Set up the argument struct */ |
788e7a89 | 1085 | nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 LT |
1086 | |
1087 | nfs_execute_write(data); | |
1088 | return 0; | |
1089 | out_bad: | |
1090 | while (!list_empty(head)) { | |
1091 | struct nfs_page *req = nfs_list_entry(head->next); | |
1092 | nfs_list_remove_request(req); | |
1093 | nfs_mark_request_dirty(req); | |
c6a556b8 | 1094 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1095 | } |
1096 | return -ENOMEM; | |
1097 | } | |
1098 | ||
7d46a49f | 1099 | static int nfs_flush_list(struct inode *inode, struct list_head *head, int npages, int how) |
1da177e4 LT |
1100 | { |
1101 | LIST_HEAD(one_request); | |
7d46a49f TM |
1102 | int (*flush_one)(struct inode *, struct list_head *, int); |
1103 | struct nfs_page *req; | |
1104 | int wpages = NFS_SERVER(inode)->wpages; | |
1105 | int wsize = NFS_SERVER(inode)->wsize; | |
1106 | int error; | |
1da177e4 | 1107 | |
7d46a49f TM |
1108 | flush_one = nfs_flush_one; |
1109 | if (wsize < PAGE_CACHE_SIZE) | |
1110 | flush_one = nfs_flush_multi; | |
1111 | /* For single writes, FLUSH_STABLE is more efficient */ | |
1112 | if (npages <= wpages && npages == NFS_I(inode)->npages | |
1113 | && nfs_list_entry(head->next)->wb_bytes <= wsize) | |
1114 | how |= FLUSH_STABLE; | |
1115 | ||
1116 | do { | |
1117 | nfs_coalesce_requests(head, &one_request, wpages); | |
1da177e4 | 1118 | req = nfs_list_entry(one_request.next); |
7d46a49f | 1119 | error = flush_one(inode, &one_request, how); |
1da177e4 | 1120 | if (error < 0) |
7d46a49f TM |
1121 | goto out_err; |
1122 | } while (!list_empty(head)); | |
1123 | return 0; | |
1124 | out_err: | |
1da177e4 LT |
1125 | while (!list_empty(head)) { |
1126 | req = nfs_list_entry(head->next); | |
1127 | nfs_list_remove_request(req); | |
1128 | nfs_mark_request_dirty(req); | |
c6a556b8 | 1129 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1130 | } |
1131 | return error; | |
1132 | } | |
1133 | ||
1134 | /* | |
1135 | * Handle a write reply that flushed part of a page. | |
1136 | */ | |
788e7a89 | 1137 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 1138 | { |
788e7a89 | 1139 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
1140 | struct nfs_page *req = data->req; |
1141 | struct page *page = req->wb_page; | |
1142 | ||
1143 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
1144 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1145 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1146 | req->wb_bytes, | |
1147 | (long long)req_offset(req)); | |
1148 | ||
788e7a89 TM |
1149 | if (nfs_writeback_done(task, data) != 0) |
1150 | return; | |
1151 | ||
1152 | if (task->tk_status < 0) { | |
1da177e4 LT |
1153 | ClearPageUptodate(page); |
1154 | SetPageError(page); | |
788e7a89 TM |
1155 | req->wb_context->error = task->tk_status; |
1156 | dprintk(", error = %d\n", task->tk_status); | |
1da177e4 LT |
1157 | } else { |
1158 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
1159 | if (data->verf.committed < NFS_FILE_SYNC) { | |
1160 | if (!NFS_NEED_COMMIT(req)) { | |
1161 | nfs_defer_commit(req); | |
1162 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1163 | dprintk(" defer commit\n"); | |
1164 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
1165 | nfs_defer_reschedule(req); | |
1166 | dprintk(" server reboot detected\n"); | |
1167 | } | |
1168 | } else | |
1169 | #endif | |
1170 | dprintk(" OK\n"); | |
1171 | } | |
1172 | ||
1173 | if (atomic_dec_and_test(&req->wb_complete)) | |
1174 | nfs_writepage_release(req); | |
1175 | } | |
1176 | ||
788e7a89 TM |
1177 | static const struct rpc_call_ops nfs_write_partial_ops = { |
1178 | .rpc_call_done = nfs_writeback_done_partial, | |
1179 | .rpc_release = nfs_writedata_release, | |
1180 | }; | |
1181 | ||
1da177e4 LT |
1182 | /* |
1183 | * Handle a write reply that flushes a whole page. | |
1184 | * | |
1185 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
1186 | * writebacks since the page->count is kept > 1 for as long | |
1187 | * as the page has a write request pending. | |
1188 | */ | |
788e7a89 | 1189 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 1190 | { |
788e7a89 | 1191 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
1192 | struct nfs_page *req; |
1193 | struct page *page; | |
1194 | ||
788e7a89 TM |
1195 | if (nfs_writeback_done(task, data) != 0) |
1196 | return; | |
1197 | ||
1da177e4 LT |
1198 | /* Update attributes as result of writeback. */ |
1199 | while (!list_empty(&data->pages)) { | |
1200 | req = nfs_list_entry(data->pages.next); | |
1201 | nfs_list_remove_request(req); | |
1202 | page = req->wb_page; | |
1203 | ||
1204 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
1205 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1206 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1207 | req->wb_bytes, | |
1208 | (long long)req_offset(req)); | |
1209 | ||
788e7a89 | 1210 | if (task->tk_status < 0) { |
1da177e4 LT |
1211 | ClearPageUptodate(page); |
1212 | SetPageError(page); | |
788e7a89 | 1213 | req->wb_context->error = task->tk_status; |
1da177e4 LT |
1214 | end_page_writeback(page); |
1215 | nfs_inode_remove_request(req); | |
788e7a89 | 1216 | dprintk(", error = %d\n", task->tk_status); |
1da177e4 LT |
1217 | goto next; |
1218 | } | |
1219 | end_page_writeback(page); | |
1220 | ||
1221 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
1222 | if (data->args.stable != NFS_UNSTABLE || data->verf.committed == NFS_FILE_SYNC) { | |
1223 | nfs_inode_remove_request(req); | |
1224 | dprintk(" OK\n"); | |
1225 | goto next; | |
1226 | } | |
1227 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1228 | nfs_mark_request_commit(req); | |
1229 | dprintk(" marked for commit\n"); | |
1230 | #else | |
1231 | nfs_inode_remove_request(req); | |
1232 | #endif | |
1233 | next: | |
c6a556b8 | 1234 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1235 | } |
1236 | } | |
1237 | ||
788e7a89 TM |
1238 | static const struct rpc_call_ops nfs_write_full_ops = { |
1239 | .rpc_call_done = nfs_writeback_done_full, | |
1240 | .rpc_release = nfs_writedata_release, | |
1241 | }; | |
1242 | ||
1243 | ||
1da177e4 LT |
1244 | /* |
1245 | * This function is called when the WRITE call is complete. | |
1246 | */ | |
462d5b32 | 1247 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1248 | { |
1da177e4 LT |
1249 | struct nfs_writeargs *argp = &data->args; |
1250 | struct nfs_writeres *resp = &data->res; | |
788e7a89 | 1251 | int status; |
1da177e4 LT |
1252 | |
1253 | dprintk("NFS: %4d nfs_writeback_done (status %d)\n", | |
1254 | task->tk_pid, task->tk_status); | |
1255 | ||
f551e44f CL |
1256 | /* |
1257 | * ->write_done will attempt to use post-op attributes to detect | |
1258 | * conflicting writes by other clients. A strict interpretation | |
1259 | * of close-to-open would allow us to continue caching even if | |
1260 | * another writer had changed the file, but some applications | |
1261 | * depend on tighter cache coherency when writing. | |
1262 | */ | |
788e7a89 TM |
1263 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1264 | if (status != 0) | |
1265 | return status; | |
91d5b470 CL |
1266 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1267 | ||
1da177e4 LT |
1268 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1269 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1270 | /* We tried a write call, but the server did not | |
1271 | * commit data to stable storage even though we | |
1272 | * requested it. | |
1273 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1274 | * the server reports NFS_DATA_SYNC, but performs | |
1275 | * NFS_FILE_SYNC. We therefore implement this checking | |
1276 | * as a dprintk() in order to avoid filling syslog. | |
1277 | */ | |
1278 | static unsigned long complain; | |
1279 | ||
1280 | if (time_before(complain, jiffies)) { | |
1281 | dprintk("NFS: faulty NFS server %s:" | |
1282 | " (committed = %d) != (stable = %d)\n", | |
54ceac45 | 1283 | NFS_SERVER(data->inode)->nfs_client->cl_hostname, |
1da177e4 LT |
1284 | resp->verf->committed, argp->stable); |
1285 | complain = jiffies + 300 * HZ; | |
1286 | } | |
1287 | } | |
1288 | #endif | |
1289 | /* Is this a short write? */ | |
1290 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1291 | static unsigned long complain; | |
1292 | ||
91d5b470 CL |
1293 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1294 | ||
1da177e4 LT |
1295 | /* Has the server at least made some progress? */ |
1296 | if (resp->count != 0) { | |
1297 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1298 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1299 | /* Resend from where the server left off */ | |
1300 | argp->offset += resp->count; | |
1301 | argp->pgbase += resp->count; | |
1302 | argp->count -= resp->count; | |
1303 | } else { | |
1304 | /* Resend as a stable write in order to avoid | |
1305 | * headaches in the case of a server crash. | |
1306 | */ | |
1307 | argp->stable = NFS_FILE_SYNC; | |
1308 | } | |
1309 | rpc_restart_call(task); | |
788e7a89 | 1310 | return -EAGAIN; |
1da177e4 LT |
1311 | } |
1312 | if (time_before(complain, jiffies)) { | |
1313 | printk(KERN_WARNING | |
1314 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1315 | argp->count); | |
1316 | complain = jiffies + 300 * HZ; | |
1317 | } | |
1318 | /* Can't do anything about it except throw an error. */ | |
1319 | task->tk_status = -EIO; | |
1320 | } | |
788e7a89 | 1321 | return 0; |
1da177e4 LT |
1322 | } |
1323 | ||
1324 | ||
1325 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
963d8fe5 | 1326 | void nfs_commit_release(void *wdata) |
1da177e4 | 1327 | { |
1da177e4 LT |
1328 | nfs_commit_free(wdata); |
1329 | } | |
1330 | ||
1331 | /* | |
1332 | * Set up the argument/result storage required for the RPC call. | |
1333 | */ | |
1334 | static void nfs_commit_rpcsetup(struct list_head *head, | |
788e7a89 TM |
1335 | struct nfs_write_data *data, |
1336 | int how) | |
1da177e4 | 1337 | { |
3da28eb1 | 1338 | struct nfs_page *first; |
1da177e4 | 1339 | struct inode *inode; |
788e7a89 | 1340 | int flags; |
1da177e4 LT |
1341 | |
1342 | /* Set up the RPC argument and reply structs | |
1343 | * NB: take care not to mess about with data->commit et al. */ | |
1344 | ||
1345 | list_splice_init(head, &data->pages); | |
1346 | first = nfs_list_entry(data->pages.next); | |
1da177e4 LT |
1347 | inode = first->wb_context->dentry->d_inode; |
1348 | ||
1da177e4 LT |
1349 | data->inode = inode; |
1350 | data->cred = first->wb_context->cred; | |
1351 | ||
1352 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1353 | /* Note: we always request a commit of the entire inode */ |
1354 | data->args.offset = 0; | |
1355 | data->args.count = 0; | |
1356 | data->res.count = 0; | |
1da177e4 LT |
1357 | data->res.fattr = &data->fattr; |
1358 | data->res.verf = &data->verf; | |
0e574af1 | 1359 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1360 | |
1361 | /* Set up the initial task struct. */ | |
1362 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
1363 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data); | |
1da177e4 LT |
1364 | NFS_PROTO(inode)->commit_setup(data, how); |
1365 | ||
1366 | data->task.tk_priority = flush_task_priority(how); | |
1367 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 1368 | |
0bbacc40 | 1369 | dprintk("NFS: %4d initiated commit call\n", data->task.tk_pid); |
1da177e4 LT |
1370 | } |
1371 | ||
1372 | /* | |
1373 | * Commit dirty pages | |
1374 | */ | |
1375 | static int | |
40859d7e | 1376 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1377 | { |
1378 | struct nfs_write_data *data; | |
1379 | struct nfs_page *req; | |
1380 | ||
e9f7bee1 | 1381 | data = nfs_commit_alloc(); |
1da177e4 LT |
1382 | |
1383 | if (!data) | |
1384 | goto out_bad; | |
1385 | ||
1386 | /* Set up the argument struct */ | |
1387 | nfs_commit_rpcsetup(head, data, how); | |
1388 | ||
1389 | nfs_execute_write(data); | |
1390 | return 0; | |
1391 | out_bad: | |
1392 | while (!list_empty(head)) { | |
1393 | req = nfs_list_entry(head->next); | |
1394 | nfs_list_remove_request(req); | |
1395 | nfs_mark_request_commit(req); | |
83715ad5 | 1396 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
5c2d97cb | 1397 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1398 | } |
1399 | return -ENOMEM; | |
1400 | } | |
1401 | ||
1402 | /* | |
1403 | * COMMIT call returned | |
1404 | */ | |
788e7a89 | 1405 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1406 | { |
963d8fe5 | 1407 | struct nfs_write_data *data = calldata; |
1da177e4 | 1408 | struct nfs_page *req; |
1da177e4 LT |
1409 | |
1410 | dprintk("NFS: %4d nfs_commit_done (status %d)\n", | |
1411 | task->tk_pid, task->tk_status); | |
1412 | ||
788e7a89 TM |
1413 | /* Call the NFS version-specific code */ |
1414 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1415 | return; | |
1416 | ||
1da177e4 LT |
1417 | while (!list_empty(&data->pages)) { |
1418 | req = nfs_list_entry(data->pages.next); | |
1419 | nfs_list_remove_request(req); | |
fd39fc85 | 1420 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
1da177e4 LT |
1421 | |
1422 | dprintk("NFS: commit (%s/%Ld %d@%Ld)", | |
1423 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1424 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1425 | req->wb_bytes, | |
1426 | (long long)req_offset(req)); | |
1427 | if (task->tk_status < 0) { | |
1428 | req->wb_context->error = task->tk_status; | |
1429 | nfs_inode_remove_request(req); | |
1430 | dprintk(", error = %d\n", task->tk_status); | |
1431 | goto next; | |
1432 | } | |
1433 | ||
1434 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1435 | * returned by the server against all stored verfs. */ | |
1436 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1437 | /* We have a match */ | |
1438 | nfs_inode_remove_request(req); | |
1439 | dprintk(" OK\n"); | |
1440 | goto next; | |
1441 | } | |
1442 | /* We have a mismatch. Write the page again */ | |
1443 | dprintk(" mismatch\n"); | |
1444 | nfs_mark_request_dirty(req); | |
1445 | next: | |
c6a556b8 | 1446 | nfs_clear_page_writeback(req); |
1da177e4 | 1447 | } |
1da177e4 | 1448 | } |
788e7a89 TM |
1449 | |
1450 | static const struct rpc_call_ops nfs_commit_ops = { | |
1451 | .rpc_call_done = nfs_commit_done, | |
1452 | .rpc_release = nfs_commit_release, | |
1453 | }; | |
c42de9dd TM |
1454 | #else |
1455 | static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) | |
1456 | { | |
1457 | return 0; | |
1458 | } | |
1da177e4 LT |
1459 | #endif |
1460 | ||
1461 | static int nfs_flush_inode(struct inode *inode, unsigned long idx_start, | |
1462 | unsigned int npages, int how) | |
1463 | { | |
1464 | struct nfs_inode *nfsi = NFS_I(inode); | |
1465 | LIST_HEAD(head); | |
7d46a49f | 1466 | int res; |
1da177e4 LT |
1467 | |
1468 | spin_lock(&nfsi->req_lock); | |
1469 | res = nfs_scan_dirty(inode, &head, idx_start, npages); | |
1470 | spin_unlock(&nfsi->req_lock); | |
ab0a3dbe | 1471 | if (res) { |
7d46a49f TM |
1472 | int error = nfs_flush_list(inode, &head, res, how); |
1473 | if (error < 0) | |
1474 | return error; | |
ab0a3dbe | 1475 | } |
1da177e4 LT |
1476 | return res; |
1477 | } | |
1478 | ||
1479 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
3da28eb1 | 1480 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 LT |
1481 | { |
1482 | struct nfs_inode *nfsi = NFS_I(inode); | |
1483 | LIST_HEAD(head); | |
7d46a49f | 1484 | int res; |
1da177e4 LT |
1485 | |
1486 | spin_lock(&nfsi->req_lock); | |
3da28eb1 TM |
1487 | res = nfs_scan_commit(inode, &head, 0, 0); |
1488 | spin_unlock(&nfsi->req_lock); | |
1da177e4 | 1489 | if (res) { |
7d46a49f | 1490 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1491 | if (error < 0) |
1492 | return error; | |
1493 | } | |
1da177e4 LT |
1494 | return res; |
1495 | } | |
1496 | #endif | |
1497 | ||
c42de9dd TM |
1498 | int nfs_sync_inode_wait(struct inode *inode, unsigned long idx_start, |
1499 | unsigned int npages, int how) | |
1da177e4 | 1500 | { |
c42de9dd TM |
1501 | struct nfs_inode *nfsi = NFS_I(inode); |
1502 | LIST_HEAD(head); | |
70b9ecbd | 1503 | int nocommit = how & FLUSH_NOCOMMIT; |
c42de9dd | 1504 | int pages, ret; |
1da177e4 | 1505 | |
c42de9dd TM |
1506 | how &= ~FLUSH_NOCOMMIT; |
1507 | spin_lock(&nfsi->req_lock); | |
1da177e4 | 1508 | do { |
c42de9dd TM |
1509 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); |
1510 | if (ret != 0) | |
70b9ecbd | 1511 | continue; |
c42de9dd TM |
1512 | pages = nfs_scan_dirty(inode, &head, idx_start, npages); |
1513 | if (pages != 0) { | |
1514 | spin_unlock(&nfsi->req_lock); | |
d2ccddf0 | 1515 | if (how & FLUSH_INVALIDATE) |
83715ad5 | 1516 | nfs_cancel_dirty_list(&head); |
d2ccddf0 TM |
1517 | else |
1518 | ret = nfs_flush_list(inode, &head, pages, how); | |
c42de9dd TM |
1519 | spin_lock(&nfsi->req_lock); |
1520 | continue; | |
1521 | } | |
1522 | if (nocommit) | |
1523 | break; | |
d2ccddf0 | 1524 | pages = nfs_scan_commit(inode, &head, idx_start, npages); |
c42de9dd TM |
1525 | if (pages == 0) |
1526 | break; | |
d2ccddf0 TM |
1527 | if (how & FLUSH_INVALIDATE) { |
1528 | spin_unlock(&nfsi->req_lock); | |
83715ad5 | 1529 | nfs_cancel_commit_list(&head); |
d2ccddf0 TM |
1530 | spin_lock(&nfsi->req_lock); |
1531 | continue; | |
1532 | } | |
1533 | pages += nfs_scan_commit(inode, &head, 0, 0); | |
c42de9dd TM |
1534 | spin_unlock(&nfsi->req_lock); |
1535 | ret = nfs_commit_list(inode, &head, how); | |
1536 | spin_lock(&nfsi->req_lock); | |
1537 | } while (ret >= 0); | |
1538 | spin_unlock(&nfsi->req_lock); | |
1539 | return ret; | |
1da177e4 LT |
1540 | } |
1541 | ||
f7b422b1 | 1542 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1543 | { |
1544 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1545 | sizeof(struct nfs_write_data), | |
1546 | 0, SLAB_HWCACHE_ALIGN, | |
1547 | NULL, NULL); | |
1548 | if (nfs_wdata_cachep == NULL) | |
1549 | return -ENOMEM; | |
1550 | ||
93d2341c MD |
1551 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1552 | nfs_wdata_cachep); | |
1da177e4 LT |
1553 | if (nfs_wdata_mempool == NULL) |
1554 | return -ENOMEM; | |
1555 | ||
93d2341c MD |
1556 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1557 | nfs_wdata_cachep); | |
1da177e4 LT |
1558 | if (nfs_commit_mempool == NULL) |
1559 | return -ENOMEM; | |
1560 | ||
1561 | return 0; | |
1562 | } | |
1563 | ||
266bee88 | 1564 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1565 | { |
1566 | mempool_destroy(nfs_commit_mempool); | |
1567 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1568 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1569 | } |
1570 |