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Commit | Line | Data |
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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> | |
1da177e4 LT |
54 | #include <linux/writeback.h> |
55 | ||
56 | #include <linux/sunrpc/clnt.h> | |
57 | #include <linux/nfs_fs.h> | |
58 | #include <linux/nfs_mount.h> | |
59 | #include <linux/nfs_page.h> | |
3fcfab16 AM |
60 | #include <linux/backing-dev.h> |
61 | ||
1da177e4 LT |
62 | #include <asm/uaccess.h> |
63 | #include <linux/smp_lock.h> | |
64 | ||
65 | #include "delegation.h" | |
49a70f27 | 66 | #include "internal.h" |
91d5b470 | 67 | #include "iostat.h" |
1da177e4 LT |
68 | |
69 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE | |
70 | ||
71 | #define MIN_POOL_WRITE (32) | |
72 | #define MIN_POOL_COMMIT (4) | |
73 | ||
74 | /* | |
75 | * Local function declarations | |
76 | */ | |
77 | static struct nfs_page * nfs_update_request(struct nfs_open_context*, | |
1da177e4 LT |
78 | struct page *, |
79 | unsigned int, unsigned int); | |
e261f51f | 80 | static void nfs_mark_request_dirty(struct nfs_page *req); |
1da177e4 LT |
81 | static int nfs_wait_on_write_congestion(struct address_space *, int); |
82 | static int nfs_wait_on_requests(struct inode *, unsigned long, unsigned int); | |
3f442547 | 83 | static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how); |
1c75950b | 84 | static int nfs_wb_page_priority(struct inode *inode, struct page *page, int how); |
788e7a89 TM |
85 | static const struct rpc_call_ops nfs_write_partial_ops; |
86 | static const struct rpc_call_ops nfs_write_full_ops; | |
87 | static const struct rpc_call_ops nfs_commit_ops; | |
1da177e4 LT |
88 | |
89 | static kmem_cache_t *nfs_wdata_cachep; | |
3feb2d49 | 90 | static mempool_t *nfs_wdata_mempool; |
1da177e4 LT |
91 | static mempool_t *nfs_commit_mempool; |
92 | ||
93 | static DECLARE_WAIT_QUEUE_HEAD(nfs_write_congestion); | |
94 | ||
e9f7bee1 | 95 | struct nfs_write_data *nfs_commit_alloc(void) |
1da177e4 LT |
96 | { |
97 | struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, SLAB_NOFS); | |
40859d7e | 98 | |
1da177e4 LT |
99 | if (p) { |
100 | memset(p, 0, sizeof(*p)); | |
101 | INIT_LIST_HEAD(&p->pages); | |
102 | } | |
103 | return p; | |
104 | } | |
105 | ||
8aca67f0 | 106 | void nfs_commit_rcu_free(struct rcu_head *head) |
1da177e4 | 107 | { |
8aca67f0 | 108 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
40859d7e CL |
109 | if (p && (p->pagevec != &p->page_array[0])) |
110 | kfree(p->pagevec); | |
1da177e4 LT |
111 | mempool_free(p, nfs_commit_mempool); |
112 | } | |
113 | ||
8aca67f0 TM |
114 | void nfs_commit_free(struct nfs_write_data *wdata) |
115 | { | |
116 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_commit_rcu_free); | |
117 | } | |
118 | ||
e9f7bee1 | 119 | struct nfs_write_data *nfs_writedata_alloc(size_t len) |
3feb2d49 | 120 | { |
e9f7bee1 | 121 | unsigned int pagecount = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
3feb2d49 TM |
122 | struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, SLAB_NOFS); |
123 | ||
124 | if (p) { | |
125 | memset(p, 0, sizeof(*p)); | |
126 | INIT_LIST_HEAD(&p->pages); | |
e9f7bee1 | 127 | p->npages = pagecount; |
0d0b5cb3 CL |
128 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
129 | p->pagevec = p->page_array; | |
3feb2d49 | 130 | else { |
0d0b5cb3 CL |
131 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
132 | if (!p->pagevec) { | |
3feb2d49 TM |
133 | mempool_free(p, nfs_wdata_mempool); |
134 | p = NULL; | |
135 | } | |
136 | } | |
137 | } | |
138 | return p; | |
139 | } | |
140 | ||
8aca67f0 | 141 | static void nfs_writedata_rcu_free(struct rcu_head *head) |
3feb2d49 | 142 | { |
8aca67f0 | 143 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
3feb2d49 TM |
144 | if (p && (p->pagevec != &p->page_array[0])) |
145 | kfree(p->pagevec); | |
146 | mempool_free(p, nfs_wdata_mempool); | |
147 | } | |
148 | ||
8aca67f0 TM |
149 | static void nfs_writedata_free(struct nfs_write_data *wdata) |
150 | { | |
151 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_writedata_rcu_free); | |
152 | } | |
153 | ||
963d8fe5 | 154 | void nfs_writedata_release(void *wdata) |
1da177e4 | 155 | { |
1da177e4 LT |
156 | nfs_writedata_free(wdata); |
157 | } | |
158 | ||
277459d2 TM |
159 | static struct nfs_page *nfs_page_find_request_locked(struct page *page) |
160 | { | |
161 | struct nfs_page *req = NULL; | |
162 | ||
163 | if (PagePrivate(page)) { | |
164 | req = (struct nfs_page *)page_private(page); | |
165 | if (req != NULL) | |
166 | atomic_inc(&req->wb_count); | |
167 | } | |
168 | return req; | |
169 | } | |
170 | ||
171 | static struct nfs_page *nfs_page_find_request(struct page *page) | |
172 | { | |
173 | struct nfs_page *req = NULL; | |
174 | spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock; | |
175 | ||
176 | spin_lock(req_lock); | |
177 | req = nfs_page_find_request_locked(page); | |
178 | spin_unlock(req_lock); | |
179 | return req; | |
180 | } | |
181 | ||
1da177e4 LT |
182 | /* Adjust the file length if we're writing beyond the end */ |
183 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) | |
184 | { | |
185 | struct inode *inode = page->mapping->host; | |
186 | loff_t end, i_size = i_size_read(inode); | |
187 | unsigned long end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; | |
188 | ||
189 | if (i_size > 0 && page->index < end_index) | |
190 | return; | |
191 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); | |
192 | if (i_size >= end) | |
193 | return; | |
91d5b470 | 194 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
1da177e4 LT |
195 | i_size_write(inode, end); |
196 | } | |
197 | ||
198 | /* We can set the PG_uptodate flag if we see that a write request | |
199 | * covers the full page. | |
200 | */ | |
201 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) | |
202 | { | |
1da177e4 LT |
203 | if (PageUptodate(page)) |
204 | return; | |
205 | if (base != 0) | |
206 | return; | |
49a70f27 | 207 | if (count != nfs_page_length(page)) |
1da177e4 | 208 | return; |
49a70f27 | 209 | if (count != PAGE_CACHE_SIZE) |
1da177e4 | 210 | memclear_highpage_flush(page, count, PAGE_CACHE_SIZE - count); |
49a70f27 | 211 | SetPageUptodate(page); |
1da177e4 LT |
212 | } |
213 | ||
e21195a7 | 214 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
1da177e4 LT |
215 | unsigned int offset, unsigned int count) |
216 | { | |
217 | struct nfs_page *req; | |
e21195a7 | 218 | int ret; |
1da177e4 | 219 | |
e21195a7 TM |
220 | for (;;) { |
221 | req = nfs_update_request(ctx, page, offset, count); | |
222 | if (!IS_ERR(req)) | |
223 | break; | |
224 | ret = PTR_ERR(req); | |
225 | if (ret != -EBUSY) | |
226 | return ret; | |
227 | ret = nfs_wb_page(page->mapping->host, page); | |
228 | if (ret != 0) | |
229 | return ret; | |
230 | } | |
1da177e4 LT |
231 | /* Update file length */ |
232 | nfs_grow_file(page, offset, count); | |
233 | /* Set the PG_uptodate flag? */ | |
234 | nfs_mark_uptodate(page, offset, count); | |
235 | nfs_unlock_request(req); | |
abd3e641 | 236 | return 0; |
1da177e4 LT |
237 | } |
238 | ||
239 | static int wb_priority(struct writeback_control *wbc) | |
240 | { | |
241 | if (wbc->for_reclaim) | |
242 | return FLUSH_HIGHPRI; | |
243 | if (wbc->for_kupdate) | |
244 | return FLUSH_LOWPRI; | |
245 | return 0; | |
246 | } | |
247 | ||
e261f51f TM |
248 | /* |
249 | * Find an associated nfs write request, and prepare to flush it out | |
250 | * Returns 1 if there was no write request, or if the request was | |
251 | * already tagged by nfs_set_page_dirty.Returns 0 if the request | |
252 | * was not tagged. | |
253 | * May also return an error if the user signalled nfs_wait_on_request(). | |
254 | */ | |
255 | static int nfs_page_mark_flush(struct page *page) | |
256 | { | |
257 | struct nfs_page *req; | |
258 | spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock; | |
259 | int ret; | |
260 | ||
261 | spin_lock(req_lock); | |
262 | for(;;) { | |
263 | req = nfs_page_find_request_locked(page); | |
264 | if (req == NULL) { | |
265 | spin_unlock(req_lock); | |
266 | return 1; | |
267 | } | |
268 | if (nfs_lock_request_dontget(req)) | |
269 | break; | |
270 | /* Note: If we hold the page lock, as is the case in nfs_writepage, | |
271 | * then the call to nfs_lock_request_dontget() will always | |
272 | * succeed provided that someone hasn't already marked the | |
273 | * request as dirty (in which case we don't care). | |
274 | */ | |
275 | spin_unlock(req_lock); | |
276 | ret = nfs_wait_on_request(req); | |
277 | nfs_release_request(req); | |
278 | if (ret != 0) | |
279 | return ret; | |
280 | spin_lock(req_lock); | |
281 | } | |
282 | spin_unlock(req_lock); | |
283 | if (test_and_set_bit(PG_FLUSHING, &req->wb_flags) == 0) | |
284 | nfs_mark_request_dirty(req); | |
285 | ret = test_bit(PG_NEED_FLUSH, &req->wb_flags); | |
286 | nfs_unlock_request(req); | |
287 | return ret; | |
288 | } | |
289 | ||
1da177e4 LT |
290 | /* |
291 | * Write an mmapped page to the server. | |
292 | */ | |
4d770ccf | 293 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
294 | { |
295 | struct nfs_open_context *ctx; | |
296 | struct inode *inode = page->mapping->host; | |
49a70f27 | 297 | unsigned offset; |
e261f51f | 298 | int err; |
1da177e4 | 299 | |
91d5b470 CL |
300 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
301 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
302 | ||
e261f51f TM |
303 | err = nfs_page_mark_flush(page); |
304 | if (err <= 0) | |
305 | goto out; | |
306 | err = 0; | |
49a70f27 TM |
307 | offset = nfs_page_length(page); |
308 | if (!offset) | |
1da177e4 | 309 | goto out; |
49a70f27 | 310 | |
d530838b | 311 | ctx = nfs_find_open_context(inode, NULL, FMODE_WRITE); |
1da177e4 LT |
312 | if (ctx == NULL) { |
313 | err = -EBADF; | |
314 | goto out; | |
315 | } | |
200baa21 | 316 | err = nfs_writepage_setup(ctx, page, 0, offset); |
1da177e4 | 317 | put_nfs_open_context(ctx); |
e261f51f TM |
318 | if (err != 0) |
319 | goto out; | |
320 | err = nfs_page_mark_flush(page); | |
321 | if (err > 0) | |
322 | err = 0; | |
1da177e4 | 323 | out: |
200baa21 TM |
324 | if (!wbc->for_writepages) |
325 | nfs_flush_mapping(page->mapping, wbc, wb_priority(wbc)); | |
4d770ccf TM |
326 | return err; |
327 | } | |
328 | ||
329 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
330 | { | |
331 | int err; | |
332 | ||
333 | err = nfs_writepage_locked(page, wbc); | |
1da177e4 | 334 | unlock_page(page); |
1da177e4 LT |
335 | return err; |
336 | } | |
337 | ||
338 | /* | |
339 | * Note: causes nfs_update_request() to block on the assumption | |
340 | * that the writeback is generated due to memory pressure. | |
341 | */ | |
342 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) | |
343 | { | |
344 | struct backing_dev_info *bdi = mapping->backing_dev_info; | |
345 | struct inode *inode = mapping->host; | |
346 | int err; | |
347 | ||
91d5b470 CL |
348 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
349 | ||
1da177e4 LT |
350 | err = generic_writepages(mapping, wbc); |
351 | if (err) | |
352 | return err; | |
353 | while (test_and_set_bit(BDI_write_congested, &bdi->state) != 0) { | |
354 | if (wbc->nonblocking) | |
355 | return 0; | |
356 | nfs_wait_on_write_congestion(mapping, 0); | |
357 | } | |
28c6925f | 358 | err = nfs_flush_mapping(mapping, wbc, wb_priority(wbc)); |
1da177e4 LT |
359 | if (err < 0) |
360 | goto out; | |
91d5b470 | 361 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, err); |
1da177e4 LT |
362 | if (!wbc->nonblocking && wbc->sync_mode == WB_SYNC_ALL) { |
363 | err = nfs_wait_on_requests(inode, 0, 0); | |
364 | if (err < 0) | |
365 | goto out; | |
366 | } | |
3da28eb1 | 367 | err = nfs_commit_inode(inode, wb_priority(wbc)); |
3f442547 | 368 | if (err > 0) |
1da177e4 | 369 | err = 0; |
1da177e4 LT |
370 | out: |
371 | clear_bit(BDI_write_congested, &bdi->state); | |
372 | wake_up_all(&nfs_write_congestion); | |
3fcfab16 | 373 | congestion_end(WRITE); |
1da177e4 LT |
374 | return err; |
375 | } | |
376 | ||
377 | /* | |
378 | * Insert a write request into an inode | |
379 | */ | |
380 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) | |
381 | { | |
382 | struct nfs_inode *nfsi = NFS_I(inode); | |
383 | int error; | |
384 | ||
385 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); | |
386 | BUG_ON(error == -EEXIST); | |
387 | if (error) | |
388 | return error; | |
389 | if (!nfsi->npages) { | |
390 | igrab(inode); | |
391 | nfs_begin_data_update(inode); | |
392 | if (nfs_have_delegation(inode, FMODE_WRITE)) | |
393 | nfsi->change_attr++; | |
394 | } | |
deb7d638 | 395 | SetPagePrivate(req->wb_page); |
277459d2 | 396 | set_page_private(req->wb_page, (unsigned long)req); |
1da177e4 LT |
397 | nfsi->npages++; |
398 | atomic_inc(&req->wb_count); | |
399 | return 0; | |
400 | } | |
401 | ||
402 | /* | |
403 | * Insert a write request into an inode | |
404 | */ | |
405 | static void nfs_inode_remove_request(struct nfs_page *req) | |
406 | { | |
407 | struct inode *inode = req->wb_context->dentry->d_inode; | |
408 | struct nfs_inode *nfsi = NFS_I(inode); | |
409 | ||
410 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
411 | ||
412 | spin_lock(&nfsi->req_lock); | |
277459d2 | 413 | set_page_private(req->wb_page, 0); |
deb7d638 | 414 | ClearPagePrivate(req->wb_page); |
1da177e4 LT |
415 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
416 | nfsi->npages--; | |
417 | if (!nfsi->npages) { | |
418 | spin_unlock(&nfsi->req_lock); | |
951a143b | 419 | nfs_end_data_update(inode); |
1da177e4 LT |
420 | iput(inode); |
421 | } else | |
422 | spin_unlock(&nfsi->req_lock); | |
423 | nfs_clear_request(req); | |
424 | nfs_release_request(req); | |
425 | } | |
426 | ||
1da177e4 LT |
427 | /* |
428 | * Add a request to the inode's dirty list. | |
429 | */ | |
430 | static void | |
431 | nfs_mark_request_dirty(struct nfs_page *req) | |
432 | { | |
433 | struct inode *inode = req->wb_context->dentry->d_inode; | |
434 | struct nfs_inode *nfsi = NFS_I(inode); | |
435 | ||
436 | spin_lock(&nfsi->req_lock); | |
3da28eb1 TM |
437 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
438 | req->wb_index, NFS_PAGE_TAG_DIRTY); | |
1da177e4 LT |
439 | nfs_list_add_request(req, &nfsi->dirty); |
440 | nfsi->ndirty++; | |
441 | spin_unlock(&nfsi->req_lock); | |
b1e7a8fd | 442 | inc_zone_page_state(req->wb_page, NR_FILE_DIRTY); |
1da177e4 LT |
443 | mark_inode_dirty(inode); |
444 | } | |
445 | ||
446 | /* | |
447 | * Check if a request is dirty | |
448 | */ | |
449 | static inline int | |
450 | nfs_dirty_request(struct nfs_page *req) | |
451 | { | |
e261f51f | 452 | return test_bit(PG_FLUSHING, &req->wb_flags) == 0; |
1da177e4 LT |
453 | } |
454 | ||
455 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
456 | /* | |
457 | * Add a request to the inode's commit list. | |
458 | */ | |
459 | static void | |
460 | nfs_mark_request_commit(struct nfs_page *req) | |
461 | { | |
462 | struct inode *inode = req->wb_context->dentry->d_inode; | |
463 | struct nfs_inode *nfsi = NFS_I(inode); | |
464 | ||
465 | spin_lock(&nfsi->req_lock); | |
466 | nfs_list_add_request(req, &nfsi->commit); | |
467 | nfsi->ncommit++; | |
468 | spin_unlock(&nfsi->req_lock); | |
fd39fc85 | 469 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
1da177e4 LT |
470 | mark_inode_dirty(inode); |
471 | } | |
472 | #endif | |
473 | ||
474 | /* | |
475 | * Wait for a request to complete. | |
476 | * | |
477 | * Interruptible by signals only if mounted with intr flag. | |
478 | */ | |
c42de9dd | 479 | static int nfs_wait_on_requests_locked(struct inode *inode, unsigned long idx_start, unsigned int npages) |
1da177e4 LT |
480 | { |
481 | struct nfs_inode *nfsi = NFS_I(inode); | |
482 | struct nfs_page *req; | |
483 | unsigned long idx_end, next; | |
484 | unsigned int res = 0; | |
485 | int error; | |
486 | ||
487 | if (npages == 0) | |
488 | idx_end = ~0; | |
489 | else | |
490 | idx_end = idx_start + npages - 1; | |
491 | ||
1da177e4 | 492 | next = idx_start; |
c6a556b8 | 493 | while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_WRITEBACK)) { |
1da177e4 LT |
494 | if (req->wb_index > idx_end) |
495 | break; | |
496 | ||
497 | next = req->wb_index + 1; | |
c6a556b8 | 498 | BUG_ON(!NFS_WBACK_BUSY(req)); |
1da177e4 LT |
499 | |
500 | atomic_inc(&req->wb_count); | |
501 | spin_unlock(&nfsi->req_lock); | |
502 | error = nfs_wait_on_request(req); | |
503 | nfs_release_request(req); | |
c42de9dd | 504 | spin_lock(&nfsi->req_lock); |
1da177e4 LT |
505 | if (error < 0) |
506 | return error; | |
1da177e4 LT |
507 | res++; |
508 | } | |
1da177e4 LT |
509 | return res; |
510 | } | |
511 | ||
c42de9dd TM |
512 | static int nfs_wait_on_requests(struct inode *inode, unsigned long idx_start, unsigned int npages) |
513 | { | |
514 | struct nfs_inode *nfsi = NFS_I(inode); | |
515 | int ret; | |
516 | ||
517 | spin_lock(&nfsi->req_lock); | |
518 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); | |
519 | spin_unlock(&nfsi->req_lock); | |
520 | return ret; | |
521 | } | |
522 | ||
83715ad5 | 523 | static void nfs_cancel_dirty_list(struct list_head *head) |
d2ccddf0 TM |
524 | { |
525 | struct nfs_page *req; | |
526 | while(!list_empty(head)) { | |
527 | req = nfs_list_entry(head->next); | |
528 | nfs_list_remove_request(req); | |
529 | nfs_inode_remove_request(req); | |
530 | nfs_clear_page_writeback(req); | |
531 | } | |
532 | } | |
533 | ||
83715ad5 TM |
534 | static void nfs_cancel_commit_list(struct list_head *head) |
535 | { | |
536 | struct nfs_page *req; | |
537 | ||
538 | while(!list_empty(head)) { | |
539 | req = nfs_list_entry(head->next); | |
b6dff26a | 540 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
83715ad5 TM |
541 | nfs_list_remove_request(req); |
542 | nfs_inode_remove_request(req); | |
b6dff26a | 543 | nfs_unlock_request(req); |
83715ad5 TM |
544 | } |
545 | } | |
546 | ||
1da177e4 LT |
547 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
548 | /* | |
549 | * nfs_scan_commit - Scan an inode for commit requests | |
550 | * @inode: NFS inode to scan | |
551 | * @dst: destination list | |
552 | * @idx_start: lower bound of page->index to scan. | |
553 | * @npages: idx_start + npages sets the upper bound to scan. | |
554 | * | |
555 | * Moves requests from the inode's 'commit' request list. | |
556 | * The requests are *not* checked to ensure that they form a contiguous set. | |
557 | */ | |
558 | static int | |
559 | nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
560 | { | |
561 | struct nfs_inode *nfsi = NFS_I(inode); | |
3da28eb1 TM |
562 | int res = 0; |
563 | ||
564 | if (nfsi->ncommit != 0) { | |
d2ccddf0 | 565 | res = nfs_scan_list(nfsi, &nfsi->commit, dst, idx_start, npages); |
3da28eb1 TM |
566 | nfsi->ncommit -= res; |
567 | if ((nfsi->ncommit == 0) != list_empty(&nfsi->commit)) | |
568 | printk(KERN_ERR "NFS: desynchronized value of nfs_i.ncommit.\n"); | |
569 | } | |
1da177e4 LT |
570 | return res; |
571 | } | |
c42de9dd TM |
572 | #else |
573 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
574 | { | |
575 | return 0; | |
576 | } | |
1da177e4 LT |
577 | #endif |
578 | ||
579 | static int nfs_wait_on_write_congestion(struct address_space *mapping, int intr) | |
580 | { | |
581 | struct backing_dev_info *bdi = mapping->backing_dev_info; | |
582 | DEFINE_WAIT(wait); | |
583 | int ret = 0; | |
584 | ||
585 | might_sleep(); | |
586 | ||
587 | if (!bdi_write_congested(bdi)) | |
588 | return 0; | |
91d5b470 CL |
589 | |
590 | nfs_inc_stats(mapping->host, NFSIOS_CONGESTIONWAIT); | |
591 | ||
1da177e4 LT |
592 | if (intr) { |
593 | struct rpc_clnt *clnt = NFS_CLIENT(mapping->host); | |
594 | sigset_t oldset; | |
595 | ||
596 | rpc_clnt_sigmask(clnt, &oldset); | |
597 | prepare_to_wait(&nfs_write_congestion, &wait, TASK_INTERRUPTIBLE); | |
598 | if (bdi_write_congested(bdi)) { | |
599 | if (signalled()) | |
600 | ret = -ERESTARTSYS; | |
601 | else | |
602 | schedule(); | |
603 | } | |
604 | rpc_clnt_sigunmask(clnt, &oldset); | |
605 | } else { | |
606 | prepare_to_wait(&nfs_write_congestion, &wait, TASK_UNINTERRUPTIBLE); | |
607 | if (bdi_write_congested(bdi)) | |
608 | schedule(); | |
609 | } | |
610 | finish_wait(&nfs_write_congestion, &wait); | |
611 | return ret; | |
612 | } | |
613 | ||
614 | ||
615 | /* | |
616 | * Try to update any existing write request, or create one if there is none. | |
617 | * In order to match, the request's credentials must match those of | |
618 | * the calling process. | |
619 | * | |
620 | * Note: Should always be called with the Page Lock held! | |
621 | */ | |
622 | static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, | |
e21195a7 | 623 | struct page *page, unsigned int offset, unsigned int bytes) |
1da177e4 | 624 | { |
e21195a7 | 625 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
626 | struct nfs_inode *nfsi = NFS_I(inode); |
627 | struct nfs_page *req, *new = NULL; | |
628 | unsigned long rqend, end; | |
629 | ||
630 | end = offset + bytes; | |
631 | ||
e21195a7 | 632 | if (nfs_wait_on_write_congestion(page->mapping, NFS_SERVER(inode)->flags & NFS_MOUNT_INTR)) |
1da177e4 LT |
633 | return ERR_PTR(-ERESTARTSYS); |
634 | for (;;) { | |
635 | /* Loop over all inode entries and see if we find | |
636 | * A request for the page we wish to update | |
637 | */ | |
638 | spin_lock(&nfsi->req_lock); | |
277459d2 | 639 | req = nfs_page_find_request_locked(page); |
1da177e4 LT |
640 | if (req) { |
641 | if (!nfs_lock_request_dontget(req)) { | |
642 | int error; | |
277459d2 | 643 | |
1da177e4 LT |
644 | spin_unlock(&nfsi->req_lock); |
645 | error = nfs_wait_on_request(req); | |
646 | nfs_release_request(req); | |
1dd594b2 NB |
647 | if (error < 0) { |
648 | if (new) | |
649 | nfs_release_request(new); | |
1da177e4 | 650 | return ERR_PTR(error); |
1dd594b2 | 651 | } |
1da177e4 LT |
652 | continue; |
653 | } | |
654 | spin_unlock(&nfsi->req_lock); | |
655 | if (new) | |
656 | nfs_release_request(new); | |
657 | break; | |
658 | } | |
659 | ||
660 | if (new) { | |
661 | int error; | |
662 | nfs_lock_request_dontget(new); | |
663 | error = nfs_inode_add_request(inode, new); | |
664 | if (error) { | |
665 | spin_unlock(&nfsi->req_lock); | |
666 | nfs_unlock_request(new); | |
667 | return ERR_PTR(error); | |
668 | } | |
669 | spin_unlock(&nfsi->req_lock); | |
1da177e4 LT |
670 | return new; |
671 | } | |
672 | spin_unlock(&nfsi->req_lock); | |
673 | ||
674 | new = nfs_create_request(ctx, inode, page, offset, bytes); | |
675 | if (IS_ERR(new)) | |
676 | return new; | |
677 | } | |
678 | ||
679 | /* We have a request for our page. | |
680 | * If the creds don't match, or the | |
681 | * page addresses don't match, | |
682 | * tell the caller to wait on the conflicting | |
683 | * request. | |
684 | */ | |
685 | rqend = req->wb_offset + req->wb_bytes; | |
686 | if (req->wb_context != ctx | |
687 | || req->wb_page != page | |
688 | || !nfs_dirty_request(req) | |
689 | || offset > rqend || end < req->wb_offset) { | |
690 | nfs_unlock_request(req); | |
691 | return ERR_PTR(-EBUSY); | |
692 | } | |
693 | ||
694 | /* Okay, the request matches. Update the region */ | |
695 | if (offset < req->wb_offset) { | |
696 | req->wb_offset = offset; | |
697 | req->wb_pgbase = offset; | |
698 | req->wb_bytes = rqend - req->wb_offset; | |
699 | } | |
700 | ||
701 | if (end > rqend) | |
702 | req->wb_bytes = end - req->wb_offset; | |
703 | ||
704 | return req; | |
705 | } | |
706 | ||
707 | int nfs_flush_incompatible(struct file *file, struct page *page) | |
708 | { | |
709 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 | 710 | struct nfs_page *req; |
1a54533e | 711 | int do_flush, status; |
1da177e4 LT |
712 | /* |
713 | * Look for a request corresponding to this page. If there | |
714 | * is one, and it belongs to another file, we flush it out | |
715 | * before we try to copy anything into the page. Do this | |
716 | * due to the lack of an ACCESS-type call in NFSv2. | |
717 | * Also do the same if we find a request from an existing | |
718 | * dropped page. | |
719 | */ | |
1a54533e TM |
720 | do { |
721 | req = nfs_page_find_request(page); | |
722 | if (req == NULL) | |
723 | return 0; | |
724 | do_flush = req->wb_page != page || req->wb_context != ctx | |
e261f51f | 725 | || !nfs_dirty_request(req); |
1da177e4 | 726 | nfs_release_request(req); |
1a54533e TM |
727 | if (!do_flush) |
728 | return 0; | |
729 | status = nfs_wb_page(page->mapping->host, page); | |
730 | } while (status == 0); | |
731 | return status; | |
1da177e4 LT |
732 | } |
733 | ||
734 | /* | |
735 | * Update and possibly write a cached page of an NFS file. | |
736 | * | |
737 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
738 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
739 | */ | |
740 | int nfs_updatepage(struct file *file, struct page *page, | |
741 | unsigned int offset, unsigned int count) | |
742 | { | |
743 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 | 744 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
745 | int status = 0; |
746 | ||
91d5b470 CL |
747 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
748 | ||
1da177e4 | 749 | dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", |
0bbacc40 CL |
750 | file->f_dentry->d_parent->d_name.name, |
751 | file->f_dentry->d_name.name, count, | |
752 | (long long)(page_offset(page) +offset)); | |
1da177e4 | 753 | |
1da177e4 LT |
754 | /* If we're not using byte range locks, and we know the page |
755 | * is entirely in cache, it may be more efficient to avoid | |
756 | * fragmenting write requests. | |
757 | */ | |
ab0a3dbe | 758 | if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) { |
49a70f27 | 759 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 760 | offset = 0; |
1da177e4 LT |
761 | } |
762 | ||
e21195a7 | 763 | status = nfs_writepage_setup(ctx, page, offset, count); |
e261f51f | 764 | __set_page_dirty_nobuffers(page); |
1da177e4 | 765 | |
1da177e4 LT |
766 | dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", |
767 | status, (long long)i_size_read(inode)); | |
768 | if (status < 0) | |
769 | ClearPageUptodate(page); | |
770 | return status; | |
771 | } | |
772 | ||
773 | static void nfs_writepage_release(struct nfs_page *req) | |
774 | { | |
775 | end_page_writeback(req->wb_page); | |
776 | ||
777 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
778 | if (!PageError(req->wb_page)) { | |
779 | if (NFS_NEED_RESCHED(req)) { | |
780 | nfs_mark_request_dirty(req); | |
781 | goto out; | |
782 | } else if (NFS_NEED_COMMIT(req)) { | |
783 | nfs_mark_request_commit(req); | |
784 | goto out; | |
785 | } | |
786 | } | |
787 | nfs_inode_remove_request(req); | |
788 | ||
789 | out: | |
790 | nfs_clear_commit(req); | |
791 | nfs_clear_reschedule(req); | |
792 | #else | |
793 | nfs_inode_remove_request(req); | |
794 | #endif | |
c6a556b8 | 795 | nfs_clear_page_writeback(req); |
1da177e4 LT |
796 | } |
797 | ||
798 | static inline int flush_task_priority(int how) | |
799 | { | |
800 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
801 | case FLUSH_HIGHPRI: | |
802 | return RPC_PRIORITY_HIGH; | |
803 | case FLUSH_LOWPRI: | |
804 | return RPC_PRIORITY_LOW; | |
805 | } | |
806 | return RPC_PRIORITY_NORMAL; | |
807 | } | |
808 | ||
809 | /* | |
810 | * Set up the argument/result storage required for the RPC call. | |
811 | */ | |
812 | static void nfs_write_rpcsetup(struct nfs_page *req, | |
813 | struct nfs_write_data *data, | |
788e7a89 | 814 | const struct rpc_call_ops *call_ops, |
1da177e4 LT |
815 | unsigned int count, unsigned int offset, |
816 | int how) | |
817 | { | |
1da177e4 | 818 | struct inode *inode; |
788e7a89 | 819 | int flags; |
1da177e4 LT |
820 | |
821 | /* Set up the RPC argument and reply structs | |
822 | * NB: take care not to mess about with data->commit et al. */ | |
823 | ||
824 | data->req = req; | |
825 | data->inode = inode = req->wb_context->dentry->d_inode; | |
826 | data->cred = req->wb_context->cred; | |
827 | ||
828 | data->args.fh = NFS_FH(inode); | |
829 | data->args.offset = req_offset(req) + offset; | |
830 | data->args.pgbase = req->wb_pgbase + offset; | |
831 | data->args.pages = data->pagevec; | |
832 | data->args.count = count; | |
833 | data->args.context = req->wb_context; | |
834 | ||
835 | data->res.fattr = &data->fattr; | |
836 | data->res.count = count; | |
837 | data->res.verf = &data->verf; | |
0e574af1 | 838 | nfs_fattr_init(&data->fattr); |
1da177e4 | 839 | |
788e7a89 TM |
840 | /* Set up the initial task struct. */ |
841 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
842 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data); | |
1da177e4 LT |
843 | NFS_PROTO(inode)->write_setup(data, how); |
844 | ||
845 | data->task.tk_priority = flush_task_priority(how); | |
846 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 LT |
847 | |
848 | dprintk("NFS: %4d initiated write call (req %s/%Ld, %u bytes @ offset %Lu)\n", | |
0bbacc40 | 849 | data->task.tk_pid, |
1da177e4 LT |
850 | inode->i_sb->s_id, |
851 | (long long)NFS_FILEID(inode), | |
852 | count, | |
853 | (unsigned long long)data->args.offset); | |
854 | } | |
855 | ||
856 | static void nfs_execute_write(struct nfs_write_data *data) | |
857 | { | |
858 | struct rpc_clnt *clnt = NFS_CLIENT(data->inode); | |
859 | sigset_t oldset; | |
860 | ||
861 | rpc_clnt_sigmask(clnt, &oldset); | |
1da177e4 | 862 | rpc_execute(&data->task); |
1da177e4 LT |
863 | rpc_clnt_sigunmask(clnt, &oldset); |
864 | } | |
865 | ||
866 | /* | |
867 | * Generate multiple small requests to write out a single | |
868 | * contiguous dirty area on one page. | |
869 | */ | |
7d46a49f | 870 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
871 | { |
872 | struct nfs_page *req = nfs_list_entry(head->next); | |
873 | struct page *page = req->wb_page; | |
874 | struct nfs_write_data *data; | |
e9f7bee1 TM |
875 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
876 | unsigned int offset; | |
1da177e4 LT |
877 | int requests = 0; |
878 | LIST_HEAD(list); | |
879 | ||
880 | nfs_list_remove_request(req); | |
881 | ||
882 | nbytes = req->wb_bytes; | |
e9f7bee1 TM |
883 | do { |
884 | size_t len = min(nbytes, wsize); | |
885 | ||
886 | data = nfs_writedata_alloc(len); | |
1da177e4 LT |
887 | if (!data) |
888 | goto out_bad; | |
889 | list_add(&data->pages, &list); | |
890 | requests++; | |
e9f7bee1 TM |
891 | nbytes -= len; |
892 | } while (nbytes != 0); | |
1da177e4 LT |
893 | atomic_set(&req->wb_complete, requests); |
894 | ||
895 | ClearPageError(page); | |
bb713d6d | 896 | set_page_writeback(page); |
1da177e4 LT |
897 | offset = 0; |
898 | nbytes = req->wb_bytes; | |
899 | do { | |
900 | data = list_entry(list.next, struct nfs_write_data, pages); | |
901 | list_del_init(&data->pages); | |
902 | ||
903 | data->pagevec[0] = page; | |
1da177e4 LT |
904 | |
905 | if (nbytes > wsize) { | |
788e7a89 TM |
906 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
907 | wsize, offset, how); | |
1da177e4 LT |
908 | offset += wsize; |
909 | nbytes -= wsize; | |
910 | } else { | |
788e7a89 TM |
911 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
912 | nbytes, offset, how); | |
1da177e4 LT |
913 | nbytes = 0; |
914 | } | |
915 | nfs_execute_write(data); | |
916 | } while (nbytes != 0); | |
917 | ||
918 | return 0; | |
919 | ||
920 | out_bad: | |
921 | while (!list_empty(&list)) { | |
922 | data = list_entry(list.next, struct nfs_write_data, pages); | |
923 | list_del(&data->pages); | |
8aca67f0 | 924 | nfs_writedata_release(data); |
1da177e4 LT |
925 | } |
926 | nfs_mark_request_dirty(req); | |
c6a556b8 | 927 | nfs_clear_page_writeback(req); |
1da177e4 LT |
928 | return -ENOMEM; |
929 | } | |
930 | ||
931 | /* | |
932 | * Create an RPC task for the given write request and kick it. | |
933 | * The page must have been locked by the caller. | |
934 | * | |
935 | * It may happen that the page we're passed is not marked dirty. | |
936 | * This is the case if nfs_updatepage detects a conflicting request | |
937 | * that has been written but not committed. | |
938 | */ | |
7d46a49f | 939 | static int nfs_flush_one(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
940 | { |
941 | struct nfs_page *req; | |
942 | struct page **pages; | |
943 | struct nfs_write_data *data; | |
944 | unsigned int count; | |
945 | ||
e9f7bee1 | 946 | data = nfs_writedata_alloc(NFS_SERVER(inode)->wsize); |
1da177e4 LT |
947 | if (!data) |
948 | goto out_bad; | |
949 | ||
950 | pages = data->pagevec; | |
951 | count = 0; | |
952 | while (!list_empty(head)) { | |
953 | req = nfs_list_entry(head->next); | |
954 | nfs_list_remove_request(req); | |
955 | nfs_list_add_request(req, &data->pages); | |
956 | ClearPageError(req->wb_page); | |
bb713d6d | 957 | set_page_writeback(req->wb_page); |
1da177e4 LT |
958 | *pages++ = req->wb_page; |
959 | count += req->wb_bytes; | |
960 | } | |
961 | req = nfs_list_entry(data->pages.next); | |
962 | ||
1da177e4 | 963 | /* Set up the argument struct */ |
788e7a89 | 964 | nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 LT |
965 | |
966 | nfs_execute_write(data); | |
967 | return 0; | |
968 | out_bad: | |
969 | while (!list_empty(head)) { | |
970 | struct nfs_page *req = nfs_list_entry(head->next); | |
971 | nfs_list_remove_request(req); | |
972 | nfs_mark_request_dirty(req); | |
c6a556b8 | 973 | nfs_clear_page_writeback(req); |
1da177e4 LT |
974 | } |
975 | return -ENOMEM; | |
976 | } | |
977 | ||
7d46a49f | 978 | static int nfs_flush_list(struct inode *inode, struct list_head *head, int npages, int how) |
1da177e4 LT |
979 | { |
980 | LIST_HEAD(one_request); | |
7d46a49f TM |
981 | int (*flush_one)(struct inode *, struct list_head *, int); |
982 | struct nfs_page *req; | |
983 | int wpages = NFS_SERVER(inode)->wpages; | |
984 | int wsize = NFS_SERVER(inode)->wsize; | |
985 | int error; | |
1da177e4 | 986 | |
7d46a49f TM |
987 | flush_one = nfs_flush_one; |
988 | if (wsize < PAGE_CACHE_SIZE) | |
989 | flush_one = nfs_flush_multi; | |
990 | /* For single writes, FLUSH_STABLE is more efficient */ | |
991 | if (npages <= wpages && npages == NFS_I(inode)->npages | |
992 | && nfs_list_entry(head->next)->wb_bytes <= wsize) | |
993 | how |= FLUSH_STABLE; | |
994 | ||
995 | do { | |
996 | nfs_coalesce_requests(head, &one_request, wpages); | |
1da177e4 | 997 | req = nfs_list_entry(one_request.next); |
7d46a49f | 998 | error = flush_one(inode, &one_request, how); |
1da177e4 | 999 | if (error < 0) |
7d46a49f TM |
1000 | goto out_err; |
1001 | } while (!list_empty(head)); | |
1002 | return 0; | |
1003 | out_err: | |
1da177e4 LT |
1004 | while (!list_empty(head)) { |
1005 | req = nfs_list_entry(head->next); | |
1006 | nfs_list_remove_request(req); | |
1007 | nfs_mark_request_dirty(req); | |
c6a556b8 | 1008 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1009 | } |
1010 | return error; | |
1011 | } | |
1012 | ||
1013 | /* | |
1014 | * Handle a write reply that flushed part of a page. | |
1015 | */ | |
788e7a89 | 1016 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 1017 | { |
788e7a89 | 1018 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
1019 | struct nfs_page *req = data->req; |
1020 | struct page *page = req->wb_page; | |
1021 | ||
1022 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
1023 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1024 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1025 | req->wb_bytes, | |
1026 | (long long)req_offset(req)); | |
1027 | ||
788e7a89 TM |
1028 | if (nfs_writeback_done(task, data) != 0) |
1029 | return; | |
1030 | ||
1031 | if (task->tk_status < 0) { | |
1da177e4 LT |
1032 | ClearPageUptodate(page); |
1033 | SetPageError(page); | |
788e7a89 TM |
1034 | req->wb_context->error = task->tk_status; |
1035 | dprintk(", error = %d\n", task->tk_status); | |
1da177e4 LT |
1036 | } else { |
1037 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
1038 | if (data->verf.committed < NFS_FILE_SYNC) { | |
1039 | if (!NFS_NEED_COMMIT(req)) { | |
1040 | nfs_defer_commit(req); | |
1041 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1042 | dprintk(" defer commit\n"); | |
1043 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
1044 | nfs_defer_reschedule(req); | |
1045 | dprintk(" server reboot detected\n"); | |
1046 | } | |
1047 | } else | |
1048 | #endif | |
1049 | dprintk(" OK\n"); | |
1050 | } | |
1051 | ||
1052 | if (atomic_dec_and_test(&req->wb_complete)) | |
1053 | nfs_writepage_release(req); | |
1054 | } | |
1055 | ||
788e7a89 TM |
1056 | static const struct rpc_call_ops nfs_write_partial_ops = { |
1057 | .rpc_call_done = nfs_writeback_done_partial, | |
1058 | .rpc_release = nfs_writedata_release, | |
1059 | }; | |
1060 | ||
1da177e4 LT |
1061 | /* |
1062 | * Handle a write reply that flushes a whole page. | |
1063 | * | |
1064 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
1065 | * writebacks since the page->count is kept > 1 for as long | |
1066 | * as the page has a write request pending. | |
1067 | */ | |
788e7a89 | 1068 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 1069 | { |
788e7a89 | 1070 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
1071 | struct nfs_page *req; |
1072 | struct page *page; | |
1073 | ||
788e7a89 TM |
1074 | if (nfs_writeback_done(task, data) != 0) |
1075 | return; | |
1076 | ||
1da177e4 LT |
1077 | /* Update attributes as result of writeback. */ |
1078 | while (!list_empty(&data->pages)) { | |
1079 | req = nfs_list_entry(data->pages.next); | |
1080 | nfs_list_remove_request(req); | |
1081 | page = req->wb_page; | |
1082 | ||
1083 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
1084 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1085 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1086 | req->wb_bytes, | |
1087 | (long long)req_offset(req)); | |
1088 | ||
788e7a89 | 1089 | if (task->tk_status < 0) { |
1da177e4 LT |
1090 | ClearPageUptodate(page); |
1091 | SetPageError(page); | |
788e7a89 | 1092 | req->wb_context->error = task->tk_status; |
1da177e4 LT |
1093 | end_page_writeback(page); |
1094 | nfs_inode_remove_request(req); | |
788e7a89 | 1095 | dprintk(", error = %d\n", task->tk_status); |
1da177e4 LT |
1096 | goto next; |
1097 | } | |
1098 | end_page_writeback(page); | |
1099 | ||
1100 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
1101 | if (data->args.stable != NFS_UNSTABLE || data->verf.committed == NFS_FILE_SYNC) { | |
1102 | nfs_inode_remove_request(req); | |
1103 | dprintk(" OK\n"); | |
1104 | goto next; | |
1105 | } | |
1106 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1107 | nfs_mark_request_commit(req); | |
1108 | dprintk(" marked for commit\n"); | |
1109 | #else | |
1110 | nfs_inode_remove_request(req); | |
1111 | #endif | |
1112 | next: | |
c6a556b8 | 1113 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1114 | } |
1115 | } | |
1116 | ||
788e7a89 TM |
1117 | static const struct rpc_call_ops nfs_write_full_ops = { |
1118 | .rpc_call_done = nfs_writeback_done_full, | |
1119 | .rpc_release = nfs_writedata_release, | |
1120 | }; | |
1121 | ||
1122 | ||
1da177e4 LT |
1123 | /* |
1124 | * This function is called when the WRITE call is complete. | |
1125 | */ | |
462d5b32 | 1126 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1127 | { |
1da177e4 LT |
1128 | struct nfs_writeargs *argp = &data->args; |
1129 | struct nfs_writeres *resp = &data->res; | |
788e7a89 | 1130 | int status; |
1da177e4 LT |
1131 | |
1132 | dprintk("NFS: %4d nfs_writeback_done (status %d)\n", | |
1133 | task->tk_pid, task->tk_status); | |
1134 | ||
f551e44f CL |
1135 | /* |
1136 | * ->write_done will attempt to use post-op attributes to detect | |
1137 | * conflicting writes by other clients. A strict interpretation | |
1138 | * of close-to-open would allow us to continue caching even if | |
1139 | * another writer had changed the file, but some applications | |
1140 | * depend on tighter cache coherency when writing. | |
1141 | */ | |
788e7a89 TM |
1142 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1143 | if (status != 0) | |
1144 | return status; | |
91d5b470 CL |
1145 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1146 | ||
1da177e4 LT |
1147 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1148 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1149 | /* We tried a write call, but the server did not | |
1150 | * commit data to stable storage even though we | |
1151 | * requested it. | |
1152 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1153 | * the server reports NFS_DATA_SYNC, but performs | |
1154 | * NFS_FILE_SYNC. We therefore implement this checking | |
1155 | * as a dprintk() in order to avoid filling syslog. | |
1156 | */ | |
1157 | static unsigned long complain; | |
1158 | ||
1159 | if (time_before(complain, jiffies)) { | |
1160 | dprintk("NFS: faulty NFS server %s:" | |
1161 | " (committed = %d) != (stable = %d)\n", | |
54ceac45 | 1162 | NFS_SERVER(data->inode)->nfs_client->cl_hostname, |
1da177e4 LT |
1163 | resp->verf->committed, argp->stable); |
1164 | complain = jiffies + 300 * HZ; | |
1165 | } | |
1166 | } | |
1167 | #endif | |
1168 | /* Is this a short write? */ | |
1169 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1170 | static unsigned long complain; | |
1171 | ||
91d5b470 CL |
1172 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1173 | ||
1da177e4 LT |
1174 | /* Has the server at least made some progress? */ |
1175 | if (resp->count != 0) { | |
1176 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1177 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1178 | /* Resend from where the server left off */ | |
1179 | argp->offset += resp->count; | |
1180 | argp->pgbase += resp->count; | |
1181 | argp->count -= resp->count; | |
1182 | } else { | |
1183 | /* Resend as a stable write in order to avoid | |
1184 | * headaches in the case of a server crash. | |
1185 | */ | |
1186 | argp->stable = NFS_FILE_SYNC; | |
1187 | } | |
1188 | rpc_restart_call(task); | |
788e7a89 | 1189 | return -EAGAIN; |
1da177e4 LT |
1190 | } |
1191 | if (time_before(complain, jiffies)) { | |
1192 | printk(KERN_WARNING | |
1193 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1194 | argp->count); | |
1195 | complain = jiffies + 300 * HZ; | |
1196 | } | |
1197 | /* Can't do anything about it except throw an error. */ | |
1198 | task->tk_status = -EIO; | |
1199 | } | |
788e7a89 | 1200 | return 0; |
1da177e4 LT |
1201 | } |
1202 | ||
1203 | ||
1204 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
963d8fe5 | 1205 | void nfs_commit_release(void *wdata) |
1da177e4 | 1206 | { |
1da177e4 LT |
1207 | nfs_commit_free(wdata); |
1208 | } | |
1209 | ||
1210 | /* | |
1211 | * Set up the argument/result storage required for the RPC call. | |
1212 | */ | |
1213 | static void nfs_commit_rpcsetup(struct list_head *head, | |
788e7a89 TM |
1214 | struct nfs_write_data *data, |
1215 | int how) | |
1da177e4 | 1216 | { |
3da28eb1 | 1217 | struct nfs_page *first; |
1da177e4 | 1218 | struct inode *inode; |
788e7a89 | 1219 | int flags; |
1da177e4 LT |
1220 | |
1221 | /* Set up the RPC argument and reply structs | |
1222 | * NB: take care not to mess about with data->commit et al. */ | |
1223 | ||
1224 | list_splice_init(head, &data->pages); | |
1225 | first = nfs_list_entry(data->pages.next); | |
1da177e4 LT |
1226 | inode = first->wb_context->dentry->d_inode; |
1227 | ||
1da177e4 LT |
1228 | data->inode = inode; |
1229 | data->cred = first->wb_context->cred; | |
1230 | ||
1231 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1232 | /* Note: we always request a commit of the entire inode */ |
1233 | data->args.offset = 0; | |
1234 | data->args.count = 0; | |
1235 | data->res.count = 0; | |
1da177e4 LT |
1236 | data->res.fattr = &data->fattr; |
1237 | data->res.verf = &data->verf; | |
0e574af1 | 1238 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1239 | |
1240 | /* Set up the initial task struct. */ | |
1241 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
1242 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data); | |
1da177e4 LT |
1243 | NFS_PROTO(inode)->commit_setup(data, how); |
1244 | ||
1245 | data->task.tk_priority = flush_task_priority(how); | |
1246 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 1247 | |
0bbacc40 | 1248 | dprintk("NFS: %4d initiated commit call\n", data->task.tk_pid); |
1da177e4 LT |
1249 | } |
1250 | ||
1251 | /* | |
1252 | * Commit dirty pages | |
1253 | */ | |
1254 | static int | |
40859d7e | 1255 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1256 | { |
1257 | struct nfs_write_data *data; | |
1258 | struct nfs_page *req; | |
1259 | ||
e9f7bee1 | 1260 | data = nfs_commit_alloc(); |
1da177e4 LT |
1261 | |
1262 | if (!data) | |
1263 | goto out_bad; | |
1264 | ||
1265 | /* Set up the argument struct */ | |
1266 | nfs_commit_rpcsetup(head, data, how); | |
1267 | ||
1268 | nfs_execute_write(data); | |
1269 | return 0; | |
1270 | out_bad: | |
1271 | while (!list_empty(head)) { | |
1272 | req = nfs_list_entry(head->next); | |
1273 | nfs_list_remove_request(req); | |
1274 | nfs_mark_request_commit(req); | |
83715ad5 | 1275 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
5c2d97cb | 1276 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1277 | } |
1278 | return -ENOMEM; | |
1279 | } | |
1280 | ||
1281 | /* | |
1282 | * COMMIT call returned | |
1283 | */ | |
788e7a89 | 1284 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1285 | { |
963d8fe5 | 1286 | struct nfs_write_data *data = calldata; |
1da177e4 | 1287 | struct nfs_page *req; |
1da177e4 LT |
1288 | |
1289 | dprintk("NFS: %4d nfs_commit_done (status %d)\n", | |
1290 | task->tk_pid, task->tk_status); | |
1291 | ||
788e7a89 TM |
1292 | /* Call the NFS version-specific code */ |
1293 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1294 | return; | |
1295 | ||
1da177e4 LT |
1296 | while (!list_empty(&data->pages)) { |
1297 | req = nfs_list_entry(data->pages.next); | |
1298 | nfs_list_remove_request(req); | |
fd39fc85 | 1299 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
1da177e4 LT |
1300 | |
1301 | dprintk("NFS: commit (%s/%Ld %d@%Ld)", | |
1302 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1303 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1304 | req->wb_bytes, | |
1305 | (long long)req_offset(req)); | |
1306 | if (task->tk_status < 0) { | |
1307 | req->wb_context->error = task->tk_status; | |
1308 | nfs_inode_remove_request(req); | |
1309 | dprintk(", error = %d\n", task->tk_status); | |
1310 | goto next; | |
1311 | } | |
1312 | ||
1313 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1314 | * returned by the server against all stored verfs. */ | |
1315 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1316 | /* We have a match */ | |
1317 | nfs_inode_remove_request(req); | |
1318 | dprintk(" OK\n"); | |
1319 | goto next; | |
1320 | } | |
1321 | /* We have a mismatch. Write the page again */ | |
1322 | dprintk(" mismatch\n"); | |
1323 | nfs_mark_request_dirty(req); | |
1324 | next: | |
c6a556b8 | 1325 | nfs_clear_page_writeback(req); |
1da177e4 | 1326 | } |
1da177e4 | 1327 | } |
788e7a89 TM |
1328 | |
1329 | static const struct rpc_call_ops nfs_commit_ops = { | |
1330 | .rpc_call_done = nfs_commit_done, | |
1331 | .rpc_release = nfs_commit_release, | |
1332 | }; | |
c42de9dd TM |
1333 | #else |
1334 | static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) | |
1335 | { | |
1336 | return 0; | |
1337 | } | |
1da177e4 LT |
1338 | #endif |
1339 | ||
3f442547 | 1340 | static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1341 | { |
28c6925f | 1342 | struct nfs_inode *nfsi = NFS_I(mapping->host); |
1da177e4 | 1343 | LIST_HEAD(head); |
3f442547 | 1344 | long res; |
1da177e4 LT |
1345 | |
1346 | spin_lock(&nfsi->req_lock); | |
3f442547 | 1347 | res = nfs_scan_dirty(mapping, wbc, &head); |
1da177e4 | 1348 | spin_unlock(&nfsi->req_lock); |
ab0a3dbe | 1349 | if (res) { |
28c6925f | 1350 | int error = nfs_flush_list(mapping->host, &head, res, how); |
7d46a49f TM |
1351 | if (error < 0) |
1352 | return error; | |
ab0a3dbe | 1353 | } |
1da177e4 LT |
1354 | return res; |
1355 | } | |
1356 | ||
1357 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
3da28eb1 | 1358 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 LT |
1359 | { |
1360 | struct nfs_inode *nfsi = NFS_I(inode); | |
1361 | LIST_HEAD(head); | |
7d46a49f | 1362 | int res; |
1da177e4 LT |
1363 | |
1364 | spin_lock(&nfsi->req_lock); | |
3da28eb1 TM |
1365 | res = nfs_scan_commit(inode, &head, 0, 0); |
1366 | spin_unlock(&nfsi->req_lock); | |
1da177e4 | 1367 | if (res) { |
7d46a49f | 1368 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1369 | if (error < 0) |
1370 | return error; | |
1371 | } | |
1da177e4 LT |
1372 | return res; |
1373 | } | |
1374 | #endif | |
1375 | ||
1c75950b | 1376 | long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1377 | { |
1c75950b | 1378 | struct inode *inode = mapping->host; |
c42de9dd | 1379 | struct nfs_inode *nfsi = NFS_I(inode); |
1c75950b TM |
1380 | unsigned long idx_start, idx_end; |
1381 | unsigned int npages = 0; | |
c42de9dd | 1382 | LIST_HEAD(head); |
70b9ecbd | 1383 | int nocommit = how & FLUSH_NOCOMMIT; |
3f442547 | 1384 | long pages, ret; |
1da177e4 | 1385 | |
1c75950b TM |
1386 | /* FIXME */ |
1387 | if (wbc->range_cyclic) | |
1388 | idx_start = 0; | |
1389 | else { | |
1390 | idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1391 | idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1392 | if (idx_end > idx_start) { | |
1393 | unsigned long l_npages = 1 + idx_end - idx_start; | |
1394 | npages = l_npages; | |
1395 | if (sizeof(npages) != sizeof(l_npages) && | |
1396 | (unsigned long)npages != l_npages) | |
1397 | npages = 0; | |
1398 | } | |
1399 | } | |
c42de9dd TM |
1400 | how &= ~FLUSH_NOCOMMIT; |
1401 | spin_lock(&nfsi->req_lock); | |
1da177e4 | 1402 | do { |
1c75950b | 1403 | wbc->pages_skipped = 0; |
c42de9dd TM |
1404 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); |
1405 | if (ret != 0) | |
70b9ecbd | 1406 | continue; |
1c75950b | 1407 | pages = nfs_scan_dirty(mapping, wbc, &head); |
c42de9dd TM |
1408 | if (pages != 0) { |
1409 | spin_unlock(&nfsi->req_lock); | |
e8e058e8 | 1410 | if (how & FLUSH_INVALIDATE) { |
83715ad5 | 1411 | nfs_cancel_dirty_list(&head); |
e8e058e8 TM |
1412 | ret = pages; |
1413 | } else | |
d2ccddf0 | 1414 | ret = nfs_flush_list(inode, &head, pages, how); |
c42de9dd TM |
1415 | spin_lock(&nfsi->req_lock); |
1416 | continue; | |
1417 | } | |
1c75950b TM |
1418 | if (wbc->pages_skipped != 0) |
1419 | continue; | |
c42de9dd TM |
1420 | if (nocommit) |
1421 | break; | |
d2ccddf0 | 1422 | pages = nfs_scan_commit(inode, &head, idx_start, npages); |
1c75950b TM |
1423 | if (pages == 0) { |
1424 | if (wbc->pages_skipped != 0) | |
1425 | continue; | |
c42de9dd | 1426 | break; |
1c75950b | 1427 | } |
d2ccddf0 TM |
1428 | if (how & FLUSH_INVALIDATE) { |
1429 | spin_unlock(&nfsi->req_lock); | |
83715ad5 | 1430 | nfs_cancel_commit_list(&head); |
e8e058e8 | 1431 | ret = pages; |
d2ccddf0 TM |
1432 | spin_lock(&nfsi->req_lock); |
1433 | continue; | |
1434 | } | |
1435 | pages += nfs_scan_commit(inode, &head, 0, 0); | |
c42de9dd TM |
1436 | spin_unlock(&nfsi->req_lock); |
1437 | ret = nfs_commit_list(inode, &head, how); | |
1438 | spin_lock(&nfsi->req_lock); | |
1439 | } while (ret >= 0); | |
1440 | spin_unlock(&nfsi->req_lock); | |
1441 | return ret; | |
1da177e4 LT |
1442 | } |
1443 | ||
1c75950b TM |
1444 | /* |
1445 | * flush the inode to disk. | |
1446 | */ | |
1447 | int nfs_wb_all(struct inode *inode) | |
1448 | { | |
1449 | struct address_space *mapping = inode->i_mapping; | |
1450 | struct writeback_control wbc = { | |
1451 | .bdi = mapping->backing_dev_info, | |
1452 | .sync_mode = WB_SYNC_ALL, | |
1453 | .nr_to_write = LONG_MAX, | |
1454 | .range_cyclic = 1, | |
1455 | }; | |
1456 | int ret; | |
1457 | ||
1458 | ret = nfs_sync_mapping_wait(mapping, &wbc, 0); | |
1459 | if (ret >= 0) | |
1460 | return 0; | |
1461 | return ret; | |
1462 | } | |
1463 | ||
1464 | int nfs_sync_mapping_range(struct address_space *mapping, loff_t range_start, loff_t range_end, int how) | |
1465 | { | |
1466 | struct writeback_control wbc = { | |
1467 | .bdi = mapping->backing_dev_info, | |
1468 | .sync_mode = WB_SYNC_ALL, | |
1469 | .nr_to_write = LONG_MAX, | |
1470 | .range_start = range_start, | |
1471 | .range_end = range_end, | |
1472 | }; | |
1473 | int ret; | |
1474 | ||
1475 | ret = nfs_sync_mapping_wait(mapping, &wbc, how); | |
1476 | if (ret >= 0) | |
1477 | return 0; | |
1478 | return ret; | |
1479 | } | |
1480 | ||
1481 | static int nfs_wb_page_priority(struct inode *inode, struct page *page, int how) | |
1482 | { | |
1483 | loff_t range_start = page_offset(page); | |
1484 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
4d770ccf TM |
1485 | struct writeback_control wbc = { |
1486 | .bdi = page->mapping->backing_dev_info, | |
1487 | .sync_mode = WB_SYNC_ALL, | |
1488 | .nr_to_write = LONG_MAX, | |
1489 | .range_start = range_start, | |
1490 | .range_end = range_end, | |
1491 | }; | |
1492 | int ret; | |
1c75950b | 1493 | |
4d770ccf TM |
1494 | BUG_ON(!PageLocked(page)); |
1495 | if (!(how & FLUSH_NOWRITEPAGE) && clear_page_dirty_for_io(page)) { | |
1496 | ret = nfs_writepage_locked(page, &wbc); | |
1497 | if (ret < 0) | |
1498 | goto out; | |
1499 | } | |
1500 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); | |
1501 | if (ret >= 0) | |
1502 | return 0; | |
1503 | out: | |
1504 | return ret; | |
1c75950b TM |
1505 | } |
1506 | ||
1507 | /* | |
1508 | * Write back all requests on one page - we do this before reading it. | |
1509 | */ | |
1510 | int nfs_wb_page(struct inode *inode, struct page* page) | |
1511 | { | |
4d770ccf | 1512 | return nfs_wb_page_priority(inode, page, FLUSH_STABLE); |
1c75950b TM |
1513 | } |
1514 | ||
1a54533e TM |
1515 | int nfs_set_page_dirty(struct page *page) |
1516 | { | |
1517 | struct nfs_page *req; | |
1518 | ||
1519 | req = nfs_page_find_request(page); | |
1520 | if (req != NULL) { | |
1521 | /* Mark any existing write requests for flushing */ | |
1522 | set_bit(PG_NEED_FLUSH, &req->wb_flags); | |
1523 | nfs_release_request(req); | |
1524 | } | |
1525 | return __set_page_dirty_nobuffers(page); | |
1526 | } | |
1527 | ||
1c75950b | 1528 | |
f7b422b1 | 1529 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1530 | { |
1531 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1532 | sizeof(struct nfs_write_data), | |
1533 | 0, SLAB_HWCACHE_ALIGN, | |
1534 | NULL, NULL); | |
1535 | if (nfs_wdata_cachep == NULL) | |
1536 | return -ENOMEM; | |
1537 | ||
93d2341c MD |
1538 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1539 | nfs_wdata_cachep); | |
1da177e4 LT |
1540 | if (nfs_wdata_mempool == NULL) |
1541 | return -ENOMEM; | |
1542 | ||
93d2341c MD |
1543 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1544 | nfs_wdata_cachep); | |
1da177e4 LT |
1545 | if (nfs_commit_mempool == NULL) |
1546 | return -ENOMEM; | |
1547 | ||
1548 | return 0; | |
1549 | } | |
1550 | ||
266bee88 | 1551 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1552 | { |
1553 | mempool_destroy(nfs_commit_mempool); | |
1554 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1555 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1556 | } |
1557 |