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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 | 81 | static int nfs_wait_on_write_congestion(struct address_space *, int); |
3f442547 | 82 | static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, 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 | 86 | |
e18b890b | 87 | static struct kmem_cache *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 | 94 | { |
e6b4f8da | 95 | struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_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 | ||
8aca67f0 | 104 | void nfs_commit_rcu_free(struct rcu_head *head) |
1da177e4 | 105 | { |
8aca67f0 | 106 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
40859d7e CL |
107 | if (p && (p->pagevec != &p->page_array[0])) |
108 | kfree(p->pagevec); | |
1da177e4 LT |
109 | mempool_free(p, nfs_commit_mempool); |
110 | } | |
111 | ||
8aca67f0 TM |
112 | void nfs_commit_free(struct nfs_write_data *wdata) |
113 | { | |
114 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_commit_rcu_free); | |
115 | } | |
116 | ||
e9f7bee1 | 117 | struct nfs_write_data *nfs_writedata_alloc(size_t len) |
3feb2d49 | 118 | { |
e9f7bee1 | 119 | unsigned int pagecount = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
e6b4f8da | 120 | struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS); |
3feb2d49 TM |
121 | |
122 | if (p) { | |
123 | memset(p, 0, sizeof(*p)); | |
124 | INIT_LIST_HEAD(&p->pages); | |
e9f7bee1 | 125 | p->npages = pagecount; |
0d0b5cb3 CL |
126 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
127 | p->pagevec = p->page_array; | |
3feb2d49 | 128 | else { |
0d0b5cb3 CL |
129 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
130 | if (!p->pagevec) { | |
3feb2d49 TM |
131 | mempool_free(p, nfs_wdata_mempool); |
132 | p = NULL; | |
133 | } | |
134 | } | |
135 | } | |
136 | return p; | |
137 | } | |
138 | ||
8aca67f0 | 139 | static void nfs_writedata_rcu_free(struct rcu_head *head) |
3feb2d49 | 140 | { |
8aca67f0 | 141 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
3feb2d49 TM |
142 | if (p && (p->pagevec != &p->page_array[0])) |
143 | kfree(p->pagevec); | |
144 | mempool_free(p, nfs_wdata_mempool); | |
145 | } | |
146 | ||
8aca67f0 TM |
147 | static void nfs_writedata_free(struct nfs_write_data *wdata) |
148 | { | |
149 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_writedata_rcu_free); | |
150 | } | |
151 | ||
963d8fe5 | 152 | void nfs_writedata_release(void *wdata) |
1da177e4 | 153 | { |
1da177e4 LT |
154 | nfs_writedata_free(wdata); |
155 | } | |
156 | ||
277459d2 TM |
157 | static struct nfs_page *nfs_page_find_request_locked(struct page *page) |
158 | { | |
159 | struct nfs_page *req = NULL; | |
160 | ||
161 | if (PagePrivate(page)) { | |
162 | req = (struct nfs_page *)page_private(page); | |
163 | if (req != NULL) | |
164 | atomic_inc(&req->wb_count); | |
165 | } | |
166 | return req; | |
167 | } | |
168 | ||
169 | static struct nfs_page *nfs_page_find_request(struct page *page) | |
170 | { | |
171 | struct nfs_page *req = NULL; | |
172 | spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock; | |
173 | ||
174 | spin_lock(req_lock); | |
175 | req = nfs_page_find_request_locked(page); | |
176 | spin_unlock(req_lock); | |
177 | return req; | |
178 | } | |
179 | ||
1da177e4 LT |
180 | /* Adjust the file length if we're writing beyond the end */ |
181 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) | |
182 | { | |
183 | struct inode *inode = page->mapping->host; | |
184 | loff_t end, i_size = i_size_read(inode); | |
185 | unsigned long end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; | |
186 | ||
187 | if (i_size > 0 && page->index < end_index) | |
188 | return; | |
189 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); | |
190 | if (i_size >= end) | |
191 | return; | |
91d5b470 | 192 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
1da177e4 LT |
193 | i_size_write(inode, end); |
194 | } | |
195 | ||
196 | /* We can set the PG_uptodate flag if we see that a write request | |
197 | * covers the full page. | |
198 | */ | |
199 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) | |
200 | { | |
1da177e4 LT |
201 | if (PageUptodate(page)) |
202 | return; | |
203 | if (base != 0) | |
204 | return; | |
49a70f27 | 205 | if (count != nfs_page_length(page)) |
1da177e4 | 206 | return; |
49a70f27 | 207 | if (count != PAGE_CACHE_SIZE) |
1da177e4 | 208 | memclear_highpage_flush(page, count, PAGE_CACHE_SIZE - count); |
49a70f27 | 209 | SetPageUptodate(page); |
1da177e4 LT |
210 | } |
211 | ||
e21195a7 | 212 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
1da177e4 LT |
213 | unsigned int offset, unsigned int count) |
214 | { | |
215 | struct nfs_page *req; | |
e21195a7 | 216 | int ret; |
1da177e4 | 217 | |
e21195a7 TM |
218 | for (;;) { |
219 | req = nfs_update_request(ctx, page, offset, count); | |
220 | if (!IS_ERR(req)) | |
221 | break; | |
222 | ret = PTR_ERR(req); | |
223 | if (ret != -EBUSY) | |
224 | return ret; | |
225 | ret = nfs_wb_page(page->mapping->host, page); | |
226 | if (ret != 0) | |
227 | return ret; | |
228 | } | |
1da177e4 LT |
229 | /* Update file length */ |
230 | nfs_grow_file(page, offset, count); | |
231 | /* Set the PG_uptodate flag? */ | |
232 | nfs_mark_uptodate(page, offset, count); | |
233 | nfs_unlock_request(req); | |
abd3e641 | 234 | return 0; |
1da177e4 LT |
235 | } |
236 | ||
237 | static int wb_priority(struct writeback_control *wbc) | |
238 | { | |
239 | if (wbc->for_reclaim) | |
240 | return FLUSH_HIGHPRI; | |
241 | if (wbc->for_kupdate) | |
242 | return FLUSH_LOWPRI; | |
243 | return 0; | |
244 | } | |
245 | ||
e261f51f TM |
246 | /* |
247 | * Find an associated nfs write request, and prepare to flush it out | |
248 | * Returns 1 if there was no write request, or if the request was | |
249 | * already tagged by nfs_set_page_dirty.Returns 0 if the request | |
250 | * was not tagged. | |
251 | * May also return an error if the user signalled nfs_wait_on_request(). | |
252 | */ | |
253 | static int nfs_page_mark_flush(struct page *page) | |
254 | { | |
255 | struct nfs_page *req; | |
256 | spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock; | |
257 | int ret; | |
258 | ||
259 | spin_lock(req_lock); | |
260 | for(;;) { | |
261 | req = nfs_page_find_request_locked(page); | |
262 | if (req == NULL) { | |
263 | spin_unlock(req_lock); | |
264 | return 1; | |
265 | } | |
266 | if (nfs_lock_request_dontget(req)) | |
267 | break; | |
268 | /* Note: If we hold the page lock, as is the case in nfs_writepage, | |
269 | * then the call to nfs_lock_request_dontget() will always | |
270 | * succeed provided that someone hasn't already marked the | |
271 | * request as dirty (in which case we don't care). | |
272 | */ | |
273 | spin_unlock(req_lock); | |
274 | ret = nfs_wait_on_request(req); | |
275 | nfs_release_request(req); | |
276 | if (ret != 0) | |
277 | return ret; | |
278 | spin_lock(req_lock); | |
279 | } | |
280 | spin_unlock(req_lock); | |
61822ab5 | 281 | if (test_and_set_bit(PG_FLUSHING, &req->wb_flags) == 0) { |
e261f51f | 282 | nfs_mark_request_dirty(req); |
61822ab5 TM |
283 | set_page_writeback(page); |
284 | } | |
e261f51f TM |
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 | 324 | if (!wbc->for_writepages) |
02241bc4 | 325 | nfs_flush_mapping(page->mapping, wbc, FLUSH_STABLE|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); |
d30c8348 | 362 | err = 0; |
1da177e4 LT |
363 | out: |
364 | clear_bit(BDI_write_congested, &bdi->state); | |
365 | wake_up_all(&nfs_write_congestion); | |
3fcfab16 | 366 | congestion_end(WRITE); |
1da177e4 LT |
367 | return err; |
368 | } | |
369 | ||
370 | /* | |
371 | * Insert a write request into an inode | |
372 | */ | |
373 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) | |
374 | { | |
375 | struct nfs_inode *nfsi = NFS_I(inode); | |
376 | int error; | |
377 | ||
378 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); | |
379 | BUG_ON(error == -EEXIST); | |
380 | if (error) | |
381 | return error; | |
382 | if (!nfsi->npages) { | |
383 | igrab(inode); | |
384 | nfs_begin_data_update(inode); | |
385 | if (nfs_have_delegation(inode, FMODE_WRITE)) | |
386 | nfsi->change_attr++; | |
387 | } | |
deb7d638 | 388 | SetPagePrivate(req->wb_page); |
277459d2 | 389 | set_page_private(req->wb_page, (unsigned long)req); |
1da177e4 LT |
390 | nfsi->npages++; |
391 | atomic_inc(&req->wb_count); | |
392 | return 0; | |
393 | } | |
394 | ||
395 | /* | |
396 | * Insert a write request into an inode | |
397 | */ | |
398 | static void nfs_inode_remove_request(struct nfs_page *req) | |
399 | { | |
400 | struct inode *inode = req->wb_context->dentry->d_inode; | |
401 | struct nfs_inode *nfsi = NFS_I(inode); | |
402 | ||
403 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
404 | ||
405 | spin_lock(&nfsi->req_lock); | |
277459d2 | 406 | set_page_private(req->wb_page, 0); |
deb7d638 | 407 | ClearPagePrivate(req->wb_page); |
1da177e4 LT |
408 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
409 | nfsi->npages--; | |
410 | if (!nfsi->npages) { | |
411 | spin_unlock(&nfsi->req_lock); | |
951a143b | 412 | nfs_end_data_update(inode); |
1da177e4 LT |
413 | iput(inode); |
414 | } else | |
415 | spin_unlock(&nfsi->req_lock); | |
416 | nfs_clear_request(req); | |
417 | nfs_release_request(req); | |
418 | } | |
419 | ||
1da177e4 LT |
420 | /* |
421 | * Add a request to the inode's dirty list. | |
422 | */ | |
423 | static void | |
424 | nfs_mark_request_dirty(struct nfs_page *req) | |
425 | { | |
426 | struct inode *inode = req->wb_context->dentry->d_inode; | |
427 | struct nfs_inode *nfsi = NFS_I(inode); | |
428 | ||
429 | spin_lock(&nfsi->req_lock); | |
3da28eb1 TM |
430 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
431 | req->wb_index, NFS_PAGE_TAG_DIRTY); | |
1da177e4 LT |
432 | nfs_list_add_request(req, &nfsi->dirty); |
433 | nfsi->ndirty++; | |
434 | spin_unlock(&nfsi->req_lock); | |
a1803044 | 435 | __mark_inode_dirty(inode, I_DIRTY_PAGES); |
1da177e4 LT |
436 | } |
437 | ||
61822ab5 TM |
438 | static void |
439 | nfs_redirty_request(struct nfs_page *req) | |
440 | { | |
441 | clear_bit(PG_FLUSHING, &req->wb_flags); | |
442 | __set_page_dirty_nobuffers(req->wb_page); | |
443 | } | |
444 | ||
1da177e4 LT |
445 | /* |
446 | * Check if a request is dirty | |
447 | */ | |
448 | static inline int | |
449 | nfs_dirty_request(struct nfs_page *req) | |
450 | { | |
e261f51f | 451 | return test_bit(PG_FLUSHING, &req->wb_flags) == 0; |
1da177e4 LT |
452 | } |
453 | ||
454 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
455 | /* | |
456 | * Add a request to the inode's commit list. | |
457 | */ | |
458 | static void | |
459 | nfs_mark_request_commit(struct nfs_page *req) | |
460 | { | |
461 | struct inode *inode = req->wb_context->dentry->d_inode; | |
462 | struct nfs_inode *nfsi = NFS_I(inode); | |
463 | ||
464 | spin_lock(&nfsi->req_lock); | |
465 | nfs_list_add_request(req, &nfsi->commit); | |
466 | nfsi->ncommit++; | |
467 | spin_unlock(&nfsi->req_lock); | |
fd39fc85 | 468 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
a1803044 | 469 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1da177e4 LT |
470 | } |
471 | #endif | |
472 | ||
473 | /* | |
474 | * Wait for a request to complete. | |
475 | * | |
476 | * Interruptible by signals only if mounted with intr flag. | |
477 | */ | |
c42de9dd | 478 | static int nfs_wait_on_requests_locked(struct inode *inode, unsigned long idx_start, unsigned int npages) |
1da177e4 LT |
479 | { |
480 | struct nfs_inode *nfsi = NFS_I(inode); | |
481 | struct nfs_page *req; | |
482 | unsigned long idx_end, next; | |
483 | unsigned int res = 0; | |
484 | int error; | |
485 | ||
486 | if (npages == 0) | |
487 | idx_end = ~0; | |
488 | else | |
489 | idx_end = idx_start + npages - 1; | |
490 | ||
1da177e4 | 491 | next = idx_start; |
c6a556b8 | 492 | while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_WRITEBACK)) { |
1da177e4 LT |
493 | if (req->wb_index > idx_end) |
494 | break; | |
495 | ||
496 | next = req->wb_index + 1; | |
c6a556b8 | 497 | BUG_ON(!NFS_WBACK_BUSY(req)); |
1da177e4 LT |
498 | |
499 | atomic_inc(&req->wb_count); | |
500 | spin_unlock(&nfsi->req_lock); | |
501 | error = nfs_wait_on_request(req); | |
502 | nfs_release_request(req); | |
c42de9dd | 503 | spin_lock(&nfsi->req_lock); |
1da177e4 LT |
504 | if (error < 0) |
505 | return error; | |
1da177e4 LT |
506 | res++; |
507 | } | |
1da177e4 LT |
508 | return res; |
509 | } | |
510 | ||
83715ad5 | 511 | static void nfs_cancel_dirty_list(struct list_head *head) |
d2ccddf0 TM |
512 | { |
513 | struct nfs_page *req; | |
514 | while(!list_empty(head)) { | |
515 | req = nfs_list_entry(head->next); | |
516 | nfs_list_remove_request(req); | |
517 | nfs_inode_remove_request(req); | |
518 | nfs_clear_page_writeback(req); | |
519 | } | |
520 | } | |
521 | ||
83715ad5 TM |
522 | static void nfs_cancel_commit_list(struct list_head *head) |
523 | { | |
524 | struct nfs_page *req; | |
525 | ||
526 | while(!list_empty(head)) { | |
527 | req = nfs_list_entry(head->next); | |
b6dff26a | 528 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
83715ad5 TM |
529 | nfs_list_remove_request(req); |
530 | nfs_inode_remove_request(req); | |
b6dff26a | 531 | nfs_unlock_request(req); |
83715ad5 TM |
532 | } |
533 | } | |
534 | ||
1da177e4 LT |
535 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
536 | /* | |
537 | * nfs_scan_commit - Scan an inode for commit requests | |
538 | * @inode: NFS inode to scan | |
539 | * @dst: destination list | |
540 | * @idx_start: lower bound of page->index to scan. | |
541 | * @npages: idx_start + npages sets the upper bound to scan. | |
542 | * | |
543 | * Moves requests from the inode's 'commit' request list. | |
544 | * The requests are *not* checked to ensure that they form a contiguous set. | |
545 | */ | |
546 | static int | |
547 | nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
548 | { | |
549 | struct nfs_inode *nfsi = NFS_I(inode); | |
3da28eb1 TM |
550 | int res = 0; |
551 | ||
552 | if (nfsi->ncommit != 0) { | |
d2ccddf0 | 553 | res = nfs_scan_list(nfsi, &nfsi->commit, dst, idx_start, npages); |
3da28eb1 TM |
554 | nfsi->ncommit -= res; |
555 | if ((nfsi->ncommit == 0) != list_empty(&nfsi->commit)) | |
556 | printk(KERN_ERR "NFS: desynchronized value of nfs_i.ncommit.\n"); | |
557 | } | |
1da177e4 LT |
558 | return res; |
559 | } | |
c42de9dd TM |
560 | #else |
561 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
562 | { | |
563 | return 0; | |
564 | } | |
1da177e4 LT |
565 | #endif |
566 | ||
567 | static int nfs_wait_on_write_congestion(struct address_space *mapping, int intr) | |
568 | { | |
569 | struct backing_dev_info *bdi = mapping->backing_dev_info; | |
570 | DEFINE_WAIT(wait); | |
571 | int ret = 0; | |
572 | ||
573 | might_sleep(); | |
574 | ||
575 | if (!bdi_write_congested(bdi)) | |
576 | return 0; | |
91d5b470 CL |
577 | |
578 | nfs_inc_stats(mapping->host, NFSIOS_CONGESTIONWAIT); | |
579 | ||
1da177e4 LT |
580 | if (intr) { |
581 | struct rpc_clnt *clnt = NFS_CLIENT(mapping->host); | |
582 | sigset_t oldset; | |
583 | ||
584 | rpc_clnt_sigmask(clnt, &oldset); | |
585 | prepare_to_wait(&nfs_write_congestion, &wait, TASK_INTERRUPTIBLE); | |
586 | if (bdi_write_congested(bdi)) { | |
587 | if (signalled()) | |
588 | ret = -ERESTARTSYS; | |
589 | else | |
590 | schedule(); | |
591 | } | |
592 | rpc_clnt_sigunmask(clnt, &oldset); | |
593 | } else { | |
594 | prepare_to_wait(&nfs_write_congestion, &wait, TASK_UNINTERRUPTIBLE); | |
595 | if (bdi_write_congested(bdi)) | |
596 | schedule(); | |
597 | } | |
598 | finish_wait(&nfs_write_congestion, &wait); | |
599 | return ret; | |
600 | } | |
601 | ||
602 | ||
603 | /* | |
604 | * Try to update any existing write request, or create one if there is none. | |
605 | * In order to match, the request's credentials must match those of | |
606 | * the calling process. | |
607 | * | |
608 | * Note: Should always be called with the Page Lock held! | |
609 | */ | |
610 | static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, | |
e21195a7 | 611 | struct page *page, unsigned int offset, unsigned int bytes) |
1da177e4 | 612 | { |
e21195a7 | 613 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
614 | struct nfs_inode *nfsi = NFS_I(inode); |
615 | struct nfs_page *req, *new = NULL; | |
616 | unsigned long rqend, end; | |
617 | ||
618 | end = offset + bytes; | |
619 | ||
e21195a7 | 620 | if (nfs_wait_on_write_congestion(page->mapping, NFS_SERVER(inode)->flags & NFS_MOUNT_INTR)) |
1da177e4 LT |
621 | return ERR_PTR(-ERESTARTSYS); |
622 | for (;;) { | |
623 | /* Loop over all inode entries and see if we find | |
624 | * A request for the page we wish to update | |
625 | */ | |
626 | spin_lock(&nfsi->req_lock); | |
277459d2 | 627 | req = nfs_page_find_request_locked(page); |
1da177e4 LT |
628 | if (req) { |
629 | if (!nfs_lock_request_dontget(req)) { | |
630 | int error; | |
277459d2 | 631 | |
1da177e4 LT |
632 | spin_unlock(&nfsi->req_lock); |
633 | error = nfs_wait_on_request(req); | |
634 | nfs_release_request(req); | |
1dd594b2 NB |
635 | if (error < 0) { |
636 | if (new) | |
637 | nfs_release_request(new); | |
1da177e4 | 638 | return ERR_PTR(error); |
1dd594b2 | 639 | } |
1da177e4 LT |
640 | continue; |
641 | } | |
642 | spin_unlock(&nfsi->req_lock); | |
643 | if (new) | |
644 | nfs_release_request(new); | |
645 | break; | |
646 | } | |
647 | ||
648 | if (new) { | |
649 | int error; | |
650 | nfs_lock_request_dontget(new); | |
651 | error = nfs_inode_add_request(inode, new); | |
652 | if (error) { | |
653 | spin_unlock(&nfsi->req_lock); | |
654 | nfs_unlock_request(new); | |
655 | return ERR_PTR(error); | |
656 | } | |
657 | spin_unlock(&nfsi->req_lock); | |
1da177e4 LT |
658 | return new; |
659 | } | |
660 | spin_unlock(&nfsi->req_lock); | |
661 | ||
662 | new = nfs_create_request(ctx, inode, page, offset, bytes); | |
663 | if (IS_ERR(new)) | |
664 | return new; | |
665 | } | |
666 | ||
667 | /* We have a request for our page. | |
668 | * If the creds don't match, or the | |
669 | * page addresses don't match, | |
670 | * tell the caller to wait on the conflicting | |
671 | * request. | |
672 | */ | |
673 | rqend = req->wb_offset + req->wb_bytes; | |
674 | if (req->wb_context != ctx | |
675 | || req->wb_page != page | |
676 | || !nfs_dirty_request(req) | |
677 | || offset > rqend || end < req->wb_offset) { | |
678 | nfs_unlock_request(req); | |
679 | return ERR_PTR(-EBUSY); | |
680 | } | |
681 | ||
682 | /* Okay, the request matches. Update the region */ | |
683 | if (offset < req->wb_offset) { | |
684 | req->wb_offset = offset; | |
685 | req->wb_pgbase = offset; | |
686 | req->wb_bytes = rqend - req->wb_offset; | |
687 | } | |
688 | ||
689 | if (end > rqend) | |
690 | req->wb_bytes = end - req->wb_offset; | |
691 | ||
692 | return req; | |
693 | } | |
694 | ||
695 | int nfs_flush_incompatible(struct file *file, struct page *page) | |
696 | { | |
697 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 | 698 | struct nfs_page *req; |
1a54533e | 699 | int do_flush, status; |
1da177e4 LT |
700 | /* |
701 | * Look for a request corresponding to this page. If there | |
702 | * is one, and it belongs to another file, we flush it out | |
703 | * before we try to copy anything into the page. Do this | |
704 | * due to the lack of an ACCESS-type call in NFSv2. | |
705 | * Also do the same if we find a request from an existing | |
706 | * dropped page. | |
707 | */ | |
1a54533e TM |
708 | do { |
709 | req = nfs_page_find_request(page); | |
710 | if (req == NULL) | |
711 | return 0; | |
712 | do_flush = req->wb_page != page || req->wb_context != ctx | |
e261f51f | 713 | || !nfs_dirty_request(req); |
1da177e4 | 714 | nfs_release_request(req); |
1a54533e TM |
715 | if (!do_flush) |
716 | return 0; | |
717 | status = nfs_wb_page(page->mapping->host, page); | |
718 | } while (status == 0); | |
719 | return status; | |
1da177e4 LT |
720 | } |
721 | ||
722 | /* | |
723 | * Update and possibly write a cached page of an NFS file. | |
724 | * | |
725 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
726 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
727 | */ | |
728 | int nfs_updatepage(struct file *file, struct page *page, | |
729 | unsigned int offset, unsigned int count) | |
730 | { | |
731 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 | 732 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
733 | int status = 0; |
734 | ||
91d5b470 CL |
735 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
736 | ||
1da177e4 | 737 | dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", |
01cce933 JJS |
738 | file->f_path.dentry->d_parent->d_name.name, |
739 | file->f_path.dentry->d_name.name, count, | |
0bbacc40 | 740 | (long long)(page_offset(page) +offset)); |
1da177e4 | 741 | |
1da177e4 LT |
742 | /* If we're not using byte range locks, and we know the page |
743 | * is entirely in cache, it may be more efficient to avoid | |
744 | * fragmenting write requests. | |
745 | */ | |
ab0a3dbe | 746 | if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) { |
49a70f27 | 747 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 748 | offset = 0; |
1da177e4 LT |
749 | } |
750 | ||
e21195a7 | 751 | status = nfs_writepage_setup(ctx, page, offset, count); |
e261f51f | 752 | __set_page_dirty_nobuffers(page); |
1da177e4 | 753 | |
1da177e4 LT |
754 | dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", |
755 | status, (long long)i_size_read(inode)); | |
756 | if (status < 0) | |
757 | ClearPageUptodate(page); | |
758 | return status; | |
759 | } | |
760 | ||
761 | static void nfs_writepage_release(struct nfs_page *req) | |
762 | { | |
763 | end_page_writeback(req->wb_page); | |
764 | ||
765 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
766 | if (!PageError(req->wb_page)) { | |
767 | if (NFS_NEED_RESCHED(req)) { | |
61822ab5 | 768 | nfs_redirty_request(req); |
1da177e4 LT |
769 | goto out; |
770 | } else if (NFS_NEED_COMMIT(req)) { | |
771 | nfs_mark_request_commit(req); | |
772 | goto out; | |
773 | } | |
774 | } | |
775 | nfs_inode_remove_request(req); | |
776 | ||
777 | out: | |
778 | nfs_clear_commit(req); | |
779 | nfs_clear_reschedule(req); | |
780 | #else | |
781 | nfs_inode_remove_request(req); | |
782 | #endif | |
c6a556b8 | 783 | nfs_clear_page_writeback(req); |
1da177e4 LT |
784 | } |
785 | ||
786 | static inline int flush_task_priority(int how) | |
787 | { | |
788 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
789 | case FLUSH_HIGHPRI: | |
790 | return RPC_PRIORITY_HIGH; | |
791 | case FLUSH_LOWPRI: | |
792 | return RPC_PRIORITY_LOW; | |
793 | } | |
794 | return RPC_PRIORITY_NORMAL; | |
795 | } | |
796 | ||
797 | /* | |
798 | * Set up the argument/result storage required for the RPC call. | |
799 | */ | |
800 | static void nfs_write_rpcsetup(struct nfs_page *req, | |
801 | struct nfs_write_data *data, | |
788e7a89 | 802 | const struct rpc_call_ops *call_ops, |
1da177e4 LT |
803 | unsigned int count, unsigned int offset, |
804 | int how) | |
805 | { | |
1da177e4 | 806 | struct inode *inode; |
788e7a89 | 807 | int flags; |
1da177e4 LT |
808 | |
809 | /* Set up the RPC argument and reply structs | |
810 | * NB: take care not to mess about with data->commit et al. */ | |
811 | ||
812 | data->req = req; | |
813 | data->inode = inode = req->wb_context->dentry->d_inode; | |
814 | data->cred = req->wb_context->cred; | |
815 | ||
816 | data->args.fh = NFS_FH(inode); | |
817 | data->args.offset = req_offset(req) + offset; | |
818 | data->args.pgbase = req->wb_pgbase + offset; | |
819 | data->args.pages = data->pagevec; | |
820 | data->args.count = count; | |
821 | data->args.context = req->wb_context; | |
822 | ||
823 | data->res.fattr = &data->fattr; | |
824 | data->res.count = count; | |
825 | data->res.verf = &data->verf; | |
0e574af1 | 826 | nfs_fattr_init(&data->fattr); |
1da177e4 | 827 | |
788e7a89 TM |
828 | /* Set up the initial task struct. */ |
829 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
830 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data); | |
1da177e4 LT |
831 | NFS_PROTO(inode)->write_setup(data, how); |
832 | ||
833 | data->task.tk_priority = flush_task_priority(how); | |
834 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 LT |
835 | |
836 | dprintk("NFS: %4d initiated write call (req %s/%Ld, %u bytes @ offset %Lu)\n", | |
0bbacc40 | 837 | data->task.tk_pid, |
1da177e4 LT |
838 | inode->i_sb->s_id, |
839 | (long long)NFS_FILEID(inode), | |
840 | count, | |
841 | (unsigned long long)data->args.offset); | |
842 | } | |
843 | ||
844 | static void nfs_execute_write(struct nfs_write_data *data) | |
845 | { | |
846 | struct rpc_clnt *clnt = NFS_CLIENT(data->inode); | |
847 | sigset_t oldset; | |
848 | ||
849 | rpc_clnt_sigmask(clnt, &oldset); | |
1da177e4 | 850 | rpc_execute(&data->task); |
1da177e4 LT |
851 | rpc_clnt_sigunmask(clnt, &oldset); |
852 | } | |
853 | ||
854 | /* | |
855 | * Generate multiple small requests to write out a single | |
856 | * contiguous dirty area on one page. | |
857 | */ | |
7d46a49f | 858 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
859 | { |
860 | struct nfs_page *req = nfs_list_entry(head->next); | |
861 | struct page *page = req->wb_page; | |
862 | struct nfs_write_data *data; | |
e9f7bee1 TM |
863 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
864 | unsigned int offset; | |
1da177e4 LT |
865 | int requests = 0; |
866 | LIST_HEAD(list); | |
867 | ||
868 | nfs_list_remove_request(req); | |
869 | ||
870 | nbytes = req->wb_bytes; | |
e9f7bee1 TM |
871 | do { |
872 | size_t len = min(nbytes, wsize); | |
873 | ||
874 | data = nfs_writedata_alloc(len); | |
1da177e4 LT |
875 | if (!data) |
876 | goto out_bad; | |
877 | list_add(&data->pages, &list); | |
878 | requests++; | |
e9f7bee1 TM |
879 | nbytes -= len; |
880 | } while (nbytes != 0); | |
1da177e4 LT |
881 | atomic_set(&req->wb_complete, requests); |
882 | ||
883 | ClearPageError(page); | |
1da177e4 LT |
884 | offset = 0; |
885 | nbytes = req->wb_bytes; | |
886 | do { | |
887 | data = list_entry(list.next, struct nfs_write_data, pages); | |
888 | list_del_init(&data->pages); | |
889 | ||
890 | data->pagevec[0] = page; | |
1da177e4 LT |
891 | |
892 | if (nbytes > wsize) { | |
788e7a89 TM |
893 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
894 | wsize, offset, how); | |
1da177e4 LT |
895 | offset += wsize; |
896 | nbytes -= wsize; | |
897 | } else { | |
788e7a89 TM |
898 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
899 | nbytes, offset, how); | |
1da177e4 LT |
900 | nbytes = 0; |
901 | } | |
902 | nfs_execute_write(data); | |
903 | } while (nbytes != 0); | |
904 | ||
905 | return 0; | |
906 | ||
907 | out_bad: | |
908 | while (!list_empty(&list)) { | |
909 | data = list_entry(list.next, struct nfs_write_data, pages); | |
910 | list_del(&data->pages); | |
8aca67f0 | 911 | nfs_writedata_release(data); |
1da177e4 | 912 | } |
61822ab5 | 913 | nfs_redirty_request(req); |
c6a556b8 | 914 | nfs_clear_page_writeback(req); |
1da177e4 LT |
915 | return -ENOMEM; |
916 | } | |
917 | ||
918 | /* | |
919 | * Create an RPC task for the given write request and kick it. | |
920 | * The page must have been locked by the caller. | |
921 | * | |
922 | * It may happen that the page we're passed is not marked dirty. | |
923 | * This is the case if nfs_updatepage detects a conflicting request | |
924 | * that has been written but not committed. | |
925 | */ | |
7d46a49f | 926 | static int nfs_flush_one(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
927 | { |
928 | struct nfs_page *req; | |
929 | struct page **pages; | |
930 | struct nfs_write_data *data; | |
931 | unsigned int count; | |
932 | ||
e9f7bee1 | 933 | data = nfs_writedata_alloc(NFS_SERVER(inode)->wsize); |
1da177e4 LT |
934 | if (!data) |
935 | goto out_bad; | |
936 | ||
937 | pages = data->pagevec; | |
938 | count = 0; | |
939 | while (!list_empty(head)) { | |
940 | req = nfs_list_entry(head->next); | |
941 | nfs_list_remove_request(req); | |
942 | nfs_list_add_request(req, &data->pages); | |
943 | ClearPageError(req->wb_page); | |
1da177e4 LT |
944 | *pages++ = req->wb_page; |
945 | count += req->wb_bytes; | |
946 | } | |
947 | req = nfs_list_entry(data->pages.next); | |
948 | ||
1da177e4 | 949 | /* Set up the argument struct */ |
788e7a89 | 950 | nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 LT |
951 | |
952 | nfs_execute_write(data); | |
953 | return 0; | |
954 | out_bad: | |
955 | while (!list_empty(head)) { | |
956 | struct nfs_page *req = nfs_list_entry(head->next); | |
957 | nfs_list_remove_request(req); | |
61822ab5 | 958 | nfs_redirty_request(req); |
c6a556b8 | 959 | nfs_clear_page_writeback(req); |
1da177e4 LT |
960 | } |
961 | return -ENOMEM; | |
962 | } | |
963 | ||
7d46a49f | 964 | static int nfs_flush_list(struct inode *inode, struct list_head *head, int npages, int how) |
1da177e4 LT |
965 | { |
966 | LIST_HEAD(one_request); | |
7d46a49f TM |
967 | int (*flush_one)(struct inode *, struct list_head *, int); |
968 | struct nfs_page *req; | |
969 | int wpages = NFS_SERVER(inode)->wpages; | |
970 | int wsize = NFS_SERVER(inode)->wsize; | |
971 | int error; | |
1da177e4 | 972 | |
7d46a49f TM |
973 | flush_one = nfs_flush_one; |
974 | if (wsize < PAGE_CACHE_SIZE) | |
975 | flush_one = nfs_flush_multi; | |
976 | /* For single writes, FLUSH_STABLE is more efficient */ | |
977 | if (npages <= wpages && npages == NFS_I(inode)->npages | |
978 | && nfs_list_entry(head->next)->wb_bytes <= wsize) | |
979 | how |= FLUSH_STABLE; | |
980 | ||
981 | do { | |
982 | nfs_coalesce_requests(head, &one_request, wpages); | |
1da177e4 | 983 | req = nfs_list_entry(one_request.next); |
7d46a49f | 984 | error = flush_one(inode, &one_request, how); |
1da177e4 | 985 | if (error < 0) |
7d46a49f TM |
986 | goto out_err; |
987 | } while (!list_empty(head)); | |
988 | return 0; | |
989 | out_err: | |
1da177e4 LT |
990 | while (!list_empty(head)) { |
991 | req = nfs_list_entry(head->next); | |
992 | nfs_list_remove_request(req); | |
61822ab5 | 993 | nfs_redirty_request(req); |
c6a556b8 | 994 | nfs_clear_page_writeback(req); |
1da177e4 LT |
995 | } |
996 | return error; | |
997 | } | |
998 | ||
999 | /* | |
1000 | * Handle a write reply that flushed part of a page. | |
1001 | */ | |
788e7a89 | 1002 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 1003 | { |
788e7a89 | 1004 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
1005 | struct nfs_page *req = data->req; |
1006 | struct page *page = req->wb_page; | |
1007 | ||
1008 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
1009 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1010 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1011 | req->wb_bytes, | |
1012 | (long long)req_offset(req)); | |
1013 | ||
788e7a89 TM |
1014 | if (nfs_writeback_done(task, data) != 0) |
1015 | return; | |
1016 | ||
1017 | if (task->tk_status < 0) { | |
1da177e4 LT |
1018 | ClearPageUptodate(page); |
1019 | SetPageError(page); | |
788e7a89 TM |
1020 | req->wb_context->error = task->tk_status; |
1021 | dprintk(", error = %d\n", task->tk_status); | |
1da177e4 LT |
1022 | } else { |
1023 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
1024 | if (data->verf.committed < NFS_FILE_SYNC) { | |
1025 | if (!NFS_NEED_COMMIT(req)) { | |
1026 | nfs_defer_commit(req); | |
1027 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1028 | dprintk(" defer commit\n"); | |
1029 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
1030 | nfs_defer_reschedule(req); | |
1031 | dprintk(" server reboot detected\n"); | |
1032 | } | |
1033 | } else | |
1034 | #endif | |
1035 | dprintk(" OK\n"); | |
1036 | } | |
1037 | ||
1038 | if (atomic_dec_and_test(&req->wb_complete)) | |
1039 | nfs_writepage_release(req); | |
1040 | } | |
1041 | ||
788e7a89 TM |
1042 | static const struct rpc_call_ops nfs_write_partial_ops = { |
1043 | .rpc_call_done = nfs_writeback_done_partial, | |
1044 | .rpc_release = nfs_writedata_release, | |
1045 | }; | |
1046 | ||
1da177e4 LT |
1047 | /* |
1048 | * Handle a write reply that flushes a whole page. | |
1049 | * | |
1050 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
1051 | * writebacks since the page->count is kept > 1 for as long | |
1052 | * as the page has a write request pending. | |
1053 | */ | |
788e7a89 | 1054 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 1055 | { |
788e7a89 | 1056 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
1057 | struct nfs_page *req; |
1058 | struct page *page; | |
1059 | ||
788e7a89 TM |
1060 | if (nfs_writeback_done(task, data) != 0) |
1061 | return; | |
1062 | ||
1da177e4 LT |
1063 | /* Update attributes as result of writeback. */ |
1064 | while (!list_empty(&data->pages)) { | |
1065 | req = nfs_list_entry(data->pages.next); | |
1066 | nfs_list_remove_request(req); | |
1067 | page = req->wb_page; | |
1068 | ||
1069 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
1070 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1071 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1072 | req->wb_bytes, | |
1073 | (long long)req_offset(req)); | |
1074 | ||
788e7a89 | 1075 | if (task->tk_status < 0) { |
1da177e4 LT |
1076 | ClearPageUptodate(page); |
1077 | SetPageError(page); | |
788e7a89 | 1078 | req->wb_context->error = task->tk_status; |
1da177e4 LT |
1079 | end_page_writeback(page); |
1080 | nfs_inode_remove_request(req); | |
788e7a89 | 1081 | dprintk(", error = %d\n", task->tk_status); |
1da177e4 LT |
1082 | goto next; |
1083 | } | |
1084 | end_page_writeback(page); | |
1085 | ||
1086 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
1087 | if (data->args.stable != NFS_UNSTABLE || data->verf.committed == NFS_FILE_SYNC) { | |
1088 | nfs_inode_remove_request(req); | |
1089 | dprintk(" OK\n"); | |
1090 | goto next; | |
1091 | } | |
1092 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1093 | nfs_mark_request_commit(req); | |
1094 | dprintk(" marked for commit\n"); | |
1095 | #else | |
1096 | nfs_inode_remove_request(req); | |
1097 | #endif | |
1098 | next: | |
c6a556b8 | 1099 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1100 | } |
1101 | } | |
1102 | ||
788e7a89 TM |
1103 | static const struct rpc_call_ops nfs_write_full_ops = { |
1104 | .rpc_call_done = nfs_writeback_done_full, | |
1105 | .rpc_release = nfs_writedata_release, | |
1106 | }; | |
1107 | ||
1108 | ||
1da177e4 LT |
1109 | /* |
1110 | * This function is called when the WRITE call is complete. | |
1111 | */ | |
462d5b32 | 1112 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1113 | { |
1da177e4 LT |
1114 | struct nfs_writeargs *argp = &data->args; |
1115 | struct nfs_writeres *resp = &data->res; | |
788e7a89 | 1116 | int status; |
1da177e4 LT |
1117 | |
1118 | dprintk("NFS: %4d nfs_writeback_done (status %d)\n", | |
1119 | task->tk_pid, task->tk_status); | |
1120 | ||
f551e44f CL |
1121 | /* |
1122 | * ->write_done will attempt to use post-op attributes to detect | |
1123 | * conflicting writes by other clients. A strict interpretation | |
1124 | * of close-to-open would allow us to continue caching even if | |
1125 | * another writer had changed the file, but some applications | |
1126 | * depend on tighter cache coherency when writing. | |
1127 | */ | |
788e7a89 TM |
1128 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1129 | if (status != 0) | |
1130 | return status; | |
91d5b470 CL |
1131 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1132 | ||
1da177e4 LT |
1133 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1134 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1135 | /* We tried a write call, but the server did not | |
1136 | * commit data to stable storage even though we | |
1137 | * requested it. | |
1138 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1139 | * the server reports NFS_DATA_SYNC, but performs | |
1140 | * NFS_FILE_SYNC. We therefore implement this checking | |
1141 | * as a dprintk() in order to avoid filling syslog. | |
1142 | */ | |
1143 | static unsigned long complain; | |
1144 | ||
1145 | if (time_before(complain, jiffies)) { | |
1146 | dprintk("NFS: faulty NFS server %s:" | |
1147 | " (committed = %d) != (stable = %d)\n", | |
54ceac45 | 1148 | NFS_SERVER(data->inode)->nfs_client->cl_hostname, |
1da177e4 LT |
1149 | resp->verf->committed, argp->stable); |
1150 | complain = jiffies + 300 * HZ; | |
1151 | } | |
1152 | } | |
1153 | #endif | |
1154 | /* Is this a short write? */ | |
1155 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1156 | static unsigned long complain; | |
1157 | ||
91d5b470 CL |
1158 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1159 | ||
1da177e4 LT |
1160 | /* Has the server at least made some progress? */ |
1161 | if (resp->count != 0) { | |
1162 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1163 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1164 | /* Resend from where the server left off */ | |
1165 | argp->offset += resp->count; | |
1166 | argp->pgbase += resp->count; | |
1167 | argp->count -= resp->count; | |
1168 | } else { | |
1169 | /* Resend as a stable write in order to avoid | |
1170 | * headaches in the case of a server crash. | |
1171 | */ | |
1172 | argp->stable = NFS_FILE_SYNC; | |
1173 | } | |
1174 | rpc_restart_call(task); | |
788e7a89 | 1175 | return -EAGAIN; |
1da177e4 LT |
1176 | } |
1177 | if (time_before(complain, jiffies)) { | |
1178 | printk(KERN_WARNING | |
1179 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1180 | argp->count); | |
1181 | complain = jiffies + 300 * HZ; | |
1182 | } | |
1183 | /* Can't do anything about it except throw an error. */ | |
1184 | task->tk_status = -EIO; | |
1185 | } | |
788e7a89 | 1186 | return 0; |
1da177e4 LT |
1187 | } |
1188 | ||
1189 | ||
1190 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
963d8fe5 | 1191 | void nfs_commit_release(void *wdata) |
1da177e4 | 1192 | { |
1da177e4 LT |
1193 | nfs_commit_free(wdata); |
1194 | } | |
1195 | ||
1196 | /* | |
1197 | * Set up the argument/result storage required for the RPC call. | |
1198 | */ | |
1199 | static void nfs_commit_rpcsetup(struct list_head *head, | |
788e7a89 TM |
1200 | struct nfs_write_data *data, |
1201 | int how) | |
1da177e4 | 1202 | { |
3da28eb1 | 1203 | struct nfs_page *first; |
1da177e4 | 1204 | struct inode *inode; |
788e7a89 | 1205 | int flags; |
1da177e4 LT |
1206 | |
1207 | /* Set up the RPC argument and reply structs | |
1208 | * NB: take care not to mess about with data->commit et al. */ | |
1209 | ||
1210 | list_splice_init(head, &data->pages); | |
1211 | first = nfs_list_entry(data->pages.next); | |
1da177e4 LT |
1212 | inode = first->wb_context->dentry->d_inode; |
1213 | ||
1da177e4 LT |
1214 | data->inode = inode; |
1215 | data->cred = first->wb_context->cred; | |
1216 | ||
1217 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1218 | /* Note: we always request a commit of the entire inode */ |
1219 | data->args.offset = 0; | |
1220 | data->args.count = 0; | |
1221 | data->res.count = 0; | |
1da177e4 LT |
1222 | data->res.fattr = &data->fattr; |
1223 | data->res.verf = &data->verf; | |
0e574af1 | 1224 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1225 | |
1226 | /* Set up the initial task struct. */ | |
1227 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
1228 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data); | |
1da177e4 LT |
1229 | NFS_PROTO(inode)->commit_setup(data, how); |
1230 | ||
1231 | data->task.tk_priority = flush_task_priority(how); | |
1232 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 1233 | |
0bbacc40 | 1234 | dprintk("NFS: %4d initiated commit call\n", data->task.tk_pid); |
1da177e4 LT |
1235 | } |
1236 | ||
1237 | /* | |
1238 | * Commit dirty pages | |
1239 | */ | |
1240 | static int | |
40859d7e | 1241 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1242 | { |
1243 | struct nfs_write_data *data; | |
1244 | struct nfs_page *req; | |
1245 | ||
e9f7bee1 | 1246 | data = nfs_commit_alloc(); |
1da177e4 LT |
1247 | |
1248 | if (!data) | |
1249 | goto out_bad; | |
1250 | ||
1251 | /* Set up the argument struct */ | |
1252 | nfs_commit_rpcsetup(head, data, how); | |
1253 | ||
1254 | nfs_execute_write(data); | |
1255 | return 0; | |
1256 | out_bad: | |
1257 | while (!list_empty(head)) { | |
1258 | req = nfs_list_entry(head->next); | |
1259 | nfs_list_remove_request(req); | |
1260 | nfs_mark_request_commit(req); | |
83715ad5 | 1261 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
5c2d97cb | 1262 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1263 | } |
1264 | return -ENOMEM; | |
1265 | } | |
1266 | ||
1267 | /* | |
1268 | * COMMIT call returned | |
1269 | */ | |
788e7a89 | 1270 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1271 | { |
963d8fe5 | 1272 | struct nfs_write_data *data = calldata; |
1da177e4 | 1273 | struct nfs_page *req; |
1da177e4 LT |
1274 | |
1275 | dprintk("NFS: %4d nfs_commit_done (status %d)\n", | |
1276 | task->tk_pid, task->tk_status); | |
1277 | ||
788e7a89 TM |
1278 | /* Call the NFS version-specific code */ |
1279 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1280 | return; | |
1281 | ||
1da177e4 LT |
1282 | while (!list_empty(&data->pages)) { |
1283 | req = nfs_list_entry(data->pages.next); | |
1284 | nfs_list_remove_request(req); | |
fd39fc85 | 1285 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
1da177e4 LT |
1286 | |
1287 | dprintk("NFS: commit (%s/%Ld %d@%Ld)", | |
1288 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1289 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1290 | req->wb_bytes, | |
1291 | (long long)req_offset(req)); | |
1292 | if (task->tk_status < 0) { | |
1293 | req->wb_context->error = task->tk_status; | |
1294 | nfs_inode_remove_request(req); | |
1295 | dprintk(", error = %d\n", task->tk_status); | |
1296 | goto next; | |
1297 | } | |
1298 | ||
1299 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1300 | * returned by the server against all stored verfs. */ | |
1301 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1302 | /* We have a match */ | |
1303 | nfs_inode_remove_request(req); | |
1304 | dprintk(" OK\n"); | |
1305 | goto next; | |
1306 | } | |
1307 | /* We have a mismatch. Write the page again */ | |
1308 | dprintk(" mismatch\n"); | |
61822ab5 | 1309 | nfs_redirty_request(req); |
1da177e4 | 1310 | next: |
c6a556b8 | 1311 | nfs_clear_page_writeback(req); |
1da177e4 | 1312 | } |
1da177e4 | 1313 | } |
788e7a89 TM |
1314 | |
1315 | static const struct rpc_call_ops nfs_commit_ops = { | |
1316 | .rpc_call_done = nfs_commit_done, | |
1317 | .rpc_release = nfs_commit_release, | |
1318 | }; | |
c42de9dd TM |
1319 | #else |
1320 | static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) | |
1321 | { | |
1322 | return 0; | |
1323 | } | |
1da177e4 LT |
1324 | #endif |
1325 | ||
3f442547 | 1326 | static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1327 | { |
28c6925f | 1328 | struct nfs_inode *nfsi = NFS_I(mapping->host); |
1da177e4 | 1329 | LIST_HEAD(head); |
3f442547 | 1330 | long res; |
1da177e4 LT |
1331 | |
1332 | spin_lock(&nfsi->req_lock); | |
3f442547 | 1333 | res = nfs_scan_dirty(mapping, wbc, &head); |
1da177e4 | 1334 | spin_unlock(&nfsi->req_lock); |
ab0a3dbe | 1335 | if (res) { |
28c6925f | 1336 | int error = nfs_flush_list(mapping->host, &head, res, how); |
7d46a49f TM |
1337 | if (error < 0) |
1338 | return error; | |
ab0a3dbe | 1339 | } |
1da177e4 LT |
1340 | return res; |
1341 | } | |
1342 | ||
1343 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
3da28eb1 | 1344 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 LT |
1345 | { |
1346 | struct nfs_inode *nfsi = NFS_I(inode); | |
1347 | LIST_HEAD(head); | |
7d46a49f | 1348 | int res; |
1da177e4 LT |
1349 | |
1350 | spin_lock(&nfsi->req_lock); | |
3da28eb1 TM |
1351 | res = nfs_scan_commit(inode, &head, 0, 0); |
1352 | spin_unlock(&nfsi->req_lock); | |
1da177e4 | 1353 | if (res) { |
7d46a49f | 1354 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1355 | if (error < 0) |
1356 | return error; | |
1357 | } | |
1da177e4 LT |
1358 | return res; |
1359 | } | |
1360 | #endif | |
1361 | ||
1c75950b | 1362 | long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1363 | { |
1c75950b | 1364 | struct inode *inode = mapping->host; |
c42de9dd | 1365 | struct nfs_inode *nfsi = NFS_I(inode); |
1c75950b TM |
1366 | unsigned long idx_start, idx_end; |
1367 | unsigned int npages = 0; | |
c42de9dd | 1368 | LIST_HEAD(head); |
70b9ecbd | 1369 | int nocommit = how & FLUSH_NOCOMMIT; |
3f442547 | 1370 | long pages, ret; |
1da177e4 | 1371 | |
1c75950b TM |
1372 | /* FIXME */ |
1373 | if (wbc->range_cyclic) | |
1374 | idx_start = 0; | |
1375 | else { | |
1376 | idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1377 | idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1378 | if (idx_end > idx_start) { | |
1379 | unsigned long l_npages = 1 + idx_end - idx_start; | |
1380 | npages = l_npages; | |
1381 | if (sizeof(npages) != sizeof(l_npages) && | |
1382 | (unsigned long)npages != l_npages) | |
1383 | npages = 0; | |
1384 | } | |
1385 | } | |
c42de9dd TM |
1386 | how &= ~FLUSH_NOCOMMIT; |
1387 | spin_lock(&nfsi->req_lock); | |
1da177e4 | 1388 | do { |
1c75950b | 1389 | wbc->pages_skipped = 0; |
c42de9dd TM |
1390 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); |
1391 | if (ret != 0) | |
70b9ecbd | 1392 | continue; |
1c75950b | 1393 | pages = nfs_scan_dirty(mapping, wbc, &head); |
c42de9dd TM |
1394 | if (pages != 0) { |
1395 | spin_unlock(&nfsi->req_lock); | |
e8e058e8 | 1396 | if (how & FLUSH_INVALIDATE) { |
83715ad5 | 1397 | nfs_cancel_dirty_list(&head); |
e8e058e8 TM |
1398 | ret = pages; |
1399 | } else | |
d2ccddf0 | 1400 | ret = nfs_flush_list(inode, &head, pages, how); |
c42de9dd TM |
1401 | spin_lock(&nfsi->req_lock); |
1402 | continue; | |
1403 | } | |
1c75950b TM |
1404 | if (wbc->pages_skipped != 0) |
1405 | continue; | |
c42de9dd TM |
1406 | if (nocommit) |
1407 | break; | |
d2ccddf0 | 1408 | pages = nfs_scan_commit(inode, &head, idx_start, npages); |
1c75950b TM |
1409 | if (pages == 0) { |
1410 | if (wbc->pages_skipped != 0) | |
1411 | continue; | |
c42de9dd | 1412 | break; |
1c75950b | 1413 | } |
d2ccddf0 TM |
1414 | if (how & FLUSH_INVALIDATE) { |
1415 | spin_unlock(&nfsi->req_lock); | |
83715ad5 | 1416 | nfs_cancel_commit_list(&head); |
e8e058e8 | 1417 | ret = pages; |
d2ccddf0 TM |
1418 | spin_lock(&nfsi->req_lock); |
1419 | continue; | |
1420 | } | |
1421 | pages += nfs_scan_commit(inode, &head, 0, 0); | |
c42de9dd TM |
1422 | spin_unlock(&nfsi->req_lock); |
1423 | ret = nfs_commit_list(inode, &head, how); | |
1424 | spin_lock(&nfsi->req_lock); | |
1425 | } while (ret >= 0); | |
1426 | spin_unlock(&nfsi->req_lock); | |
1427 | return ret; | |
1da177e4 LT |
1428 | } |
1429 | ||
1c75950b TM |
1430 | /* |
1431 | * flush the inode to disk. | |
1432 | */ | |
1433 | int nfs_wb_all(struct inode *inode) | |
1434 | { | |
1435 | struct address_space *mapping = inode->i_mapping; | |
1436 | struct writeback_control wbc = { | |
1437 | .bdi = mapping->backing_dev_info, | |
1438 | .sync_mode = WB_SYNC_ALL, | |
1439 | .nr_to_write = LONG_MAX, | |
61822ab5 | 1440 | .for_writepages = 1, |
1c75950b TM |
1441 | .range_cyclic = 1, |
1442 | }; | |
1443 | int ret; | |
1444 | ||
61822ab5 TM |
1445 | ret = generic_writepages(mapping, &wbc); |
1446 | if (ret < 0) | |
1447 | goto out; | |
1c75950b TM |
1448 | ret = nfs_sync_mapping_wait(mapping, &wbc, 0); |
1449 | if (ret >= 0) | |
1450 | return 0; | |
61822ab5 | 1451 | out: |
e507d9eb | 1452 | __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); |
1c75950b TM |
1453 | return ret; |
1454 | } | |
1455 | ||
1456 | int nfs_sync_mapping_range(struct address_space *mapping, loff_t range_start, loff_t range_end, int how) | |
1457 | { | |
1458 | struct writeback_control wbc = { | |
1459 | .bdi = mapping->backing_dev_info, | |
1460 | .sync_mode = WB_SYNC_ALL, | |
1461 | .nr_to_write = LONG_MAX, | |
1462 | .range_start = range_start, | |
1463 | .range_end = range_end, | |
61822ab5 | 1464 | .for_writepages = 1, |
1c75950b TM |
1465 | }; |
1466 | int ret; | |
1467 | ||
61822ab5 TM |
1468 | if (!(how & FLUSH_NOWRITEPAGE)) { |
1469 | ret = generic_writepages(mapping, &wbc); | |
1470 | if (ret < 0) | |
1471 | goto out; | |
1472 | } | |
1c75950b TM |
1473 | ret = nfs_sync_mapping_wait(mapping, &wbc, how); |
1474 | if (ret >= 0) | |
1475 | return 0; | |
61822ab5 | 1476 | out: |
e507d9eb | 1477 | __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); |
1c75950b TM |
1478 | return ret; |
1479 | } | |
1480 | ||
61822ab5 | 1481 | int nfs_wb_page_priority(struct inode *inode, struct page *page, int how) |
1c75950b TM |
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 | } | |
f40313ac TM |
1500 | if (!PagePrivate(page)) |
1501 | return 0; | |
4d770ccf TM |
1502 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); |
1503 | if (ret >= 0) | |
1504 | return 0; | |
1505 | out: | |
e507d9eb | 1506 | __mark_inode_dirty(inode, I_DIRTY_PAGES); |
4d770ccf | 1507 | return ret; |
1c75950b TM |
1508 | } |
1509 | ||
1510 | /* | |
1511 | * Write back all requests on one page - we do this before reading it. | |
1512 | */ | |
1513 | int nfs_wb_page(struct inode *inode, struct page* page) | |
1514 | { | |
4d770ccf | 1515 | return nfs_wb_page_priority(inode, page, FLUSH_STABLE); |
1c75950b TM |
1516 | } |
1517 | ||
1a54533e TM |
1518 | int nfs_set_page_dirty(struct page *page) |
1519 | { | |
1520 | struct nfs_page *req; | |
1521 | ||
1522 | req = nfs_page_find_request(page); | |
1523 | if (req != NULL) { | |
1524 | /* Mark any existing write requests for flushing */ | |
1525 | set_bit(PG_NEED_FLUSH, &req->wb_flags); | |
1526 | nfs_release_request(req); | |
1527 | } | |
1528 | return __set_page_dirty_nobuffers(page); | |
1529 | } | |
1530 | ||
1c75950b | 1531 | |
f7b422b1 | 1532 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1533 | { |
1534 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1535 | sizeof(struct nfs_write_data), | |
1536 | 0, SLAB_HWCACHE_ALIGN, | |
1537 | NULL, NULL); | |
1538 | if (nfs_wdata_cachep == NULL) | |
1539 | return -ENOMEM; | |
1540 | ||
93d2341c MD |
1541 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1542 | nfs_wdata_cachep); | |
1da177e4 LT |
1543 | if (nfs_wdata_mempool == NULL) |
1544 | return -ENOMEM; | |
1545 | ||
93d2341c MD |
1546 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1547 | nfs_wdata_cachep); | |
1da177e4 LT |
1548 | if (nfs_commit_mempool == NULL) |
1549 | return -ENOMEM; | |
1550 | ||
1551 | return 0; | |
1552 | } | |
1553 | ||
266bee88 | 1554 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1555 | { |
1556 | mempool_destroy(nfs_commit_mempool); | |
1557 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1558 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1559 | } |
1560 |