Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/write.c | |
3 | * | |
4 | * Writing file data over NFS. | |
5 | * | |
6 | * We do it like this: When a (user) process wishes to write data to an | |
7 | * NFS file, a write request is allocated that contains the RPC task data | |
8 | * plus some info on the page to be written, and added to the inode's | |
9 | * write chain. If the process writes past the end of the page, an async | |
10 | * RPC call to write the page is scheduled immediately; otherwise, the call | |
11 | * is delayed for a few seconds. | |
12 | * | |
13 | * Just like readahead, no async I/O is performed if wsize < PAGE_SIZE. | |
14 | * | |
15 | * Write requests are kept on the inode's writeback list. Each entry in | |
16 | * that list references the page (portion) to be written. When the | |
17 | * cache timeout has expired, the RPC task is woken up, and tries to | |
18 | * lock the page. As soon as it manages to do so, the request is moved | |
19 | * from the writeback list to the writelock list. | |
20 | * | |
21 | * Note: we must make sure never to confuse the inode passed in the | |
22 | * write_page request with the one in page->inode. As far as I understand | |
23 | * it, these are different when doing a swap-out. | |
24 | * | |
25 | * To understand everything that goes on here and in the NFS read code, | |
26 | * one should be aware that a page is locked in exactly one of the following | |
27 | * cases: | |
28 | * | |
29 | * - A write request is in progress. | |
30 | * - A user process is in generic_file_write/nfs_update_page | |
31 | * - A user process is in generic_file_read | |
32 | * | |
33 | * Also note that because of the way pages are invalidated in | |
34 | * nfs_revalidate_inode, the following assertions hold: | |
35 | * | |
36 | * - If a page is dirty, there will be no read requests (a page will | |
37 | * not be re-read unless invalidated by nfs_revalidate_inode). | |
38 | * - If the page is not uptodate, there will be no pending write | |
39 | * requests, and no process will be in nfs_update_page. | |
40 | * | |
41 | * FIXME: Interaction with the vmscan routines is not optimal yet. | |
42 | * Either vmscan must be made nfs-savvy, or we need a different page | |
43 | * reclaim concept that supports something like FS-independent | |
44 | * buffer_heads with a b_ops-> field. | |
45 | * | |
46 | * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de> | |
47 | */ | |
48 | ||
1da177e4 LT |
49 | #include <linux/types.h> |
50 | #include <linux/slab.h> | |
51 | #include <linux/mm.h> | |
52 | #include <linux/pagemap.h> | |
53 | #include <linux/file.h> | |
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); |
788e7a89 TM |
84 | static const struct rpc_call_ops nfs_write_partial_ops; |
85 | static const struct rpc_call_ops nfs_write_full_ops; | |
86 | static const struct rpc_call_ops nfs_commit_ops; | |
1da177e4 LT |
87 | |
88 | static kmem_cache_t *nfs_wdata_cachep; | |
3feb2d49 | 89 | static mempool_t *nfs_wdata_mempool; |
1da177e4 LT |
90 | static mempool_t *nfs_commit_mempool; |
91 | ||
92 | static DECLARE_WAIT_QUEUE_HEAD(nfs_write_congestion); | |
93 | ||
e9f7bee1 | 94 | struct nfs_write_data *nfs_commit_alloc(void) |
1da177e4 LT |
95 | { |
96 | struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, SLAB_NOFS); | |
40859d7e | 97 | |
1da177e4 LT |
98 | if (p) { |
99 | memset(p, 0, sizeof(*p)); | |
100 | INIT_LIST_HEAD(&p->pages); | |
101 | } | |
102 | return p; | |
103 | } | |
104 | ||
8aca67f0 | 105 | void nfs_commit_rcu_free(struct rcu_head *head) |
1da177e4 | 106 | { |
8aca67f0 | 107 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
40859d7e CL |
108 | if (p && (p->pagevec != &p->page_array[0])) |
109 | kfree(p->pagevec); | |
1da177e4 LT |
110 | mempool_free(p, nfs_commit_mempool); |
111 | } | |
112 | ||
8aca67f0 TM |
113 | void nfs_commit_free(struct nfs_write_data *wdata) |
114 | { | |
115 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_commit_rcu_free); | |
116 | } | |
117 | ||
e9f7bee1 | 118 | struct nfs_write_data *nfs_writedata_alloc(size_t len) |
3feb2d49 | 119 | { |
e9f7bee1 | 120 | unsigned int pagecount = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
3feb2d49 TM |
121 | struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, SLAB_NOFS); |
122 | ||
123 | if (p) { | |
124 | memset(p, 0, sizeof(*p)); | |
125 | INIT_LIST_HEAD(&p->pages); | |
e9f7bee1 | 126 | p->npages = pagecount; |
0d0b5cb3 CL |
127 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
128 | p->pagevec = p->page_array; | |
3feb2d49 | 129 | else { |
0d0b5cb3 CL |
130 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
131 | if (!p->pagevec) { | |
3feb2d49 TM |
132 | mempool_free(p, nfs_wdata_mempool); |
133 | p = NULL; | |
134 | } | |
135 | } | |
136 | } | |
137 | return p; | |
138 | } | |
139 | ||
8aca67f0 | 140 | static void nfs_writedata_rcu_free(struct rcu_head *head) |
3feb2d49 | 141 | { |
8aca67f0 | 142 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
3feb2d49 TM |
143 | if (p && (p->pagevec != &p->page_array[0])) |
144 | kfree(p->pagevec); | |
145 | mempool_free(p, nfs_wdata_mempool); | |
146 | } | |
147 | ||
8aca67f0 TM |
148 | static void nfs_writedata_free(struct nfs_write_data *wdata) |
149 | { | |
150 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_writedata_rcu_free); | |
151 | } | |
152 | ||
963d8fe5 | 153 | void nfs_writedata_release(void *wdata) |
1da177e4 | 154 | { |
1da177e4 LT |
155 | nfs_writedata_free(wdata); |
156 | } | |
157 | ||
277459d2 TM |
158 | static struct nfs_page *nfs_page_find_request_locked(struct page *page) |
159 | { | |
160 | struct nfs_page *req = NULL; | |
161 | ||
162 | if (PagePrivate(page)) { | |
163 | req = (struct nfs_page *)page_private(page); | |
164 | if (req != NULL) | |
165 | atomic_inc(&req->wb_count); | |
166 | } | |
167 | return req; | |
168 | } | |
169 | ||
170 | static struct nfs_page *nfs_page_find_request(struct page *page) | |
171 | { | |
172 | struct nfs_page *req = NULL; | |
173 | spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock; | |
174 | ||
175 | spin_lock(req_lock); | |
176 | req = nfs_page_find_request_locked(page); | |
177 | spin_unlock(req_lock); | |
178 | return req; | |
179 | } | |
180 | ||
1da177e4 LT |
181 | /* Adjust the file length if we're writing beyond the end */ |
182 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) | |
183 | { | |
184 | struct inode *inode = page->mapping->host; | |
185 | loff_t end, i_size = i_size_read(inode); | |
186 | unsigned long end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; | |
187 | ||
188 | if (i_size > 0 && page->index < end_index) | |
189 | return; | |
190 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); | |
191 | if (i_size >= end) | |
192 | return; | |
91d5b470 | 193 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
1da177e4 LT |
194 | i_size_write(inode, end); |
195 | } | |
196 | ||
197 | /* We can set the PG_uptodate flag if we see that a write request | |
198 | * covers the full page. | |
199 | */ | |
200 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) | |
201 | { | |
1da177e4 LT |
202 | if (PageUptodate(page)) |
203 | return; | |
204 | if (base != 0) | |
205 | return; | |
49a70f27 | 206 | if (count != nfs_page_length(page)) |
1da177e4 | 207 | return; |
49a70f27 | 208 | if (count != PAGE_CACHE_SIZE) |
1da177e4 | 209 | memclear_highpage_flush(page, count, PAGE_CACHE_SIZE - count); |
49a70f27 | 210 | SetPageUptodate(page); |
1da177e4 LT |
211 | } |
212 | ||
e21195a7 | 213 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
1da177e4 LT |
214 | unsigned int offset, unsigned int count) |
215 | { | |
216 | struct nfs_page *req; | |
e21195a7 | 217 | int ret; |
1da177e4 | 218 | |
e21195a7 TM |
219 | for (;;) { |
220 | req = nfs_update_request(ctx, page, offset, count); | |
221 | if (!IS_ERR(req)) | |
222 | break; | |
223 | ret = PTR_ERR(req); | |
224 | if (ret != -EBUSY) | |
225 | return ret; | |
226 | ret = nfs_wb_page(page->mapping->host, page); | |
227 | if (ret != 0) | |
228 | return ret; | |
229 | } | |
1da177e4 LT |
230 | /* Update file length */ |
231 | nfs_grow_file(page, offset, count); | |
232 | /* Set the PG_uptodate flag? */ | |
233 | nfs_mark_uptodate(page, offset, count); | |
234 | nfs_unlock_request(req); | |
abd3e641 | 235 | return 0; |
1da177e4 LT |
236 | } |
237 | ||
238 | static int wb_priority(struct writeback_control *wbc) | |
239 | { | |
240 | if (wbc->for_reclaim) | |
241 | return FLUSH_HIGHPRI; | |
242 | if (wbc->for_kupdate) | |
243 | return FLUSH_LOWPRI; | |
244 | return 0; | |
245 | } | |
246 | ||
e261f51f TM |
247 | /* |
248 | * Find an associated nfs write request, and prepare to flush it out | |
249 | * Returns 1 if there was no write request, or if the request was | |
250 | * already tagged by nfs_set_page_dirty.Returns 0 if the request | |
251 | * was not tagged. | |
252 | * May also return an error if the user signalled nfs_wait_on_request(). | |
253 | */ | |
254 | static int nfs_page_mark_flush(struct page *page) | |
255 | { | |
256 | struct nfs_page *req; | |
257 | spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock; | |
258 | int ret; | |
259 | ||
260 | spin_lock(req_lock); | |
261 | for(;;) { | |
262 | req = nfs_page_find_request_locked(page); | |
263 | if (req == NULL) { | |
264 | spin_unlock(req_lock); | |
265 | return 1; | |
266 | } | |
267 | if (nfs_lock_request_dontget(req)) | |
268 | break; | |
269 | /* Note: If we hold the page lock, as is the case in nfs_writepage, | |
270 | * then the call to nfs_lock_request_dontget() will always | |
271 | * succeed provided that someone hasn't already marked the | |
272 | * request as dirty (in which case we don't care). | |
273 | */ | |
274 | spin_unlock(req_lock); | |
275 | ret = nfs_wait_on_request(req); | |
276 | nfs_release_request(req); | |
277 | if (ret != 0) | |
278 | return ret; | |
279 | spin_lock(req_lock); | |
280 | } | |
281 | spin_unlock(req_lock); | |
61822ab5 | 282 | if (test_and_set_bit(PG_FLUSHING, &req->wb_flags) == 0) { |
e261f51f | 283 | nfs_mark_request_dirty(req); |
61822ab5 TM |
284 | set_page_writeback(page); |
285 | } | |
e261f51f TM |
286 | ret = test_bit(PG_NEED_FLUSH, &req->wb_flags); |
287 | nfs_unlock_request(req); | |
288 | return ret; | |
289 | } | |
290 | ||
1da177e4 LT |
291 | /* |
292 | * Write an mmapped page to the server. | |
293 | */ | |
4d770ccf | 294 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
295 | { |
296 | struct nfs_open_context *ctx; | |
297 | struct inode *inode = page->mapping->host; | |
49a70f27 | 298 | unsigned offset; |
e261f51f | 299 | int err; |
1da177e4 | 300 | |
91d5b470 CL |
301 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
302 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
303 | ||
e261f51f TM |
304 | err = nfs_page_mark_flush(page); |
305 | if (err <= 0) | |
306 | goto out; | |
307 | err = 0; | |
49a70f27 TM |
308 | offset = nfs_page_length(page); |
309 | if (!offset) | |
1da177e4 | 310 | goto out; |
49a70f27 | 311 | |
d530838b | 312 | ctx = nfs_find_open_context(inode, NULL, FMODE_WRITE); |
1da177e4 LT |
313 | if (ctx == NULL) { |
314 | err = -EBADF; | |
315 | goto out; | |
316 | } | |
200baa21 | 317 | err = nfs_writepage_setup(ctx, page, 0, offset); |
1da177e4 | 318 | put_nfs_open_context(ctx); |
e261f51f TM |
319 | if (err != 0) |
320 | goto out; | |
321 | err = nfs_page_mark_flush(page); | |
322 | if (err > 0) | |
323 | err = 0; | |
1da177e4 | 324 | out: |
200baa21 TM |
325 | if (!wbc->for_writepages) |
326 | nfs_flush_mapping(page->mapping, wbc, wb_priority(wbc)); | |
4d770ccf TM |
327 | return err; |
328 | } | |
329 | ||
330 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
331 | { | |
332 | int err; | |
333 | ||
334 | err = nfs_writepage_locked(page, wbc); | |
1da177e4 | 335 | unlock_page(page); |
1da177e4 LT |
336 | return err; |
337 | } | |
338 | ||
339 | /* | |
340 | * Note: causes nfs_update_request() to block on the assumption | |
341 | * that the writeback is generated due to memory pressure. | |
342 | */ | |
343 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) | |
344 | { | |
345 | struct backing_dev_info *bdi = mapping->backing_dev_info; | |
346 | struct inode *inode = mapping->host; | |
347 | int err; | |
348 | ||
91d5b470 CL |
349 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
350 | ||
1da177e4 LT |
351 | err = generic_writepages(mapping, wbc); |
352 | if (err) | |
353 | return err; | |
354 | while (test_and_set_bit(BDI_write_congested, &bdi->state) != 0) { | |
355 | if (wbc->nonblocking) | |
356 | return 0; | |
357 | nfs_wait_on_write_congestion(mapping, 0); | |
358 | } | |
28c6925f | 359 | err = nfs_flush_mapping(mapping, wbc, wb_priority(wbc)); |
1da177e4 LT |
360 | if (err < 0) |
361 | goto out; | |
91d5b470 | 362 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, err); |
1da177e4 LT |
363 | if (!wbc->nonblocking && wbc->sync_mode == WB_SYNC_ALL) { |
364 | err = nfs_wait_on_requests(inode, 0, 0); | |
365 | if (err < 0) | |
366 | goto out; | |
367 | } | |
3da28eb1 | 368 | err = nfs_commit_inode(inode, wb_priority(wbc)); |
3f442547 | 369 | if (err > 0) |
1da177e4 | 370 | err = 0; |
1da177e4 LT |
371 | out: |
372 | clear_bit(BDI_write_congested, &bdi->state); | |
373 | wake_up_all(&nfs_write_congestion); | |
3fcfab16 | 374 | congestion_end(WRITE); |
1da177e4 LT |
375 | return err; |
376 | } | |
377 | ||
378 | /* | |
379 | * Insert a write request into an inode | |
380 | */ | |
381 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) | |
382 | { | |
383 | struct nfs_inode *nfsi = NFS_I(inode); | |
384 | int error; | |
385 | ||
386 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); | |
387 | BUG_ON(error == -EEXIST); | |
388 | if (error) | |
389 | return error; | |
390 | if (!nfsi->npages) { | |
391 | igrab(inode); | |
392 | nfs_begin_data_update(inode); | |
393 | if (nfs_have_delegation(inode, FMODE_WRITE)) | |
394 | nfsi->change_attr++; | |
395 | } | |
deb7d638 | 396 | SetPagePrivate(req->wb_page); |
277459d2 | 397 | set_page_private(req->wb_page, (unsigned long)req); |
1da177e4 LT |
398 | nfsi->npages++; |
399 | atomic_inc(&req->wb_count); | |
400 | return 0; | |
401 | } | |
402 | ||
403 | /* | |
404 | * Insert a write request into an inode | |
405 | */ | |
406 | static void nfs_inode_remove_request(struct nfs_page *req) | |
407 | { | |
408 | struct inode *inode = req->wb_context->dentry->d_inode; | |
409 | struct nfs_inode *nfsi = NFS_I(inode); | |
410 | ||
411 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
412 | ||
413 | spin_lock(&nfsi->req_lock); | |
277459d2 | 414 | set_page_private(req->wb_page, 0); |
deb7d638 | 415 | ClearPagePrivate(req->wb_page); |
1da177e4 LT |
416 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
417 | nfsi->npages--; | |
418 | if (!nfsi->npages) { | |
419 | spin_unlock(&nfsi->req_lock); | |
951a143b | 420 | nfs_end_data_update(inode); |
1da177e4 LT |
421 | iput(inode); |
422 | } else | |
423 | spin_unlock(&nfsi->req_lock); | |
424 | nfs_clear_request(req); | |
425 | nfs_release_request(req); | |
426 | } | |
427 | ||
1da177e4 LT |
428 | /* |
429 | * Add a request to the inode's dirty list. | |
430 | */ | |
431 | static void | |
432 | nfs_mark_request_dirty(struct nfs_page *req) | |
433 | { | |
434 | struct inode *inode = req->wb_context->dentry->d_inode; | |
435 | struct nfs_inode *nfsi = NFS_I(inode); | |
436 | ||
437 | spin_lock(&nfsi->req_lock); | |
3da28eb1 TM |
438 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
439 | req->wb_index, NFS_PAGE_TAG_DIRTY); | |
1da177e4 LT |
440 | nfs_list_add_request(req, &nfsi->dirty); |
441 | nfsi->ndirty++; | |
442 | spin_unlock(&nfsi->req_lock); | |
b1e7a8fd | 443 | inc_zone_page_state(req->wb_page, NR_FILE_DIRTY); |
1da177e4 LT |
444 | mark_inode_dirty(inode); |
445 | } | |
446 | ||
61822ab5 TM |
447 | static void |
448 | nfs_redirty_request(struct nfs_page *req) | |
449 | { | |
450 | clear_bit(PG_FLUSHING, &req->wb_flags); | |
451 | __set_page_dirty_nobuffers(req->wb_page); | |
452 | } | |
453 | ||
1da177e4 LT |
454 | /* |
455 | * Check if a request is dirty | |
456 | */ | |
457 | static inline int | |
458 | nfs_dirty_request(struct nfs_page *req) | |
459 | { | |
e261f51f | 460 | return test_bit(PG_FLUSHING, &req->wb_flags) == 0; |
1da177e4 LT |
461 | } |
462 | ||
463 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
464 | /* | |
465 | * Add a request to the inode's commit list. | |
466 | */ | |
467 | static void | |
468 | nfs_mark_request_commit(struct nfs_page *req) | |
469 | { | |
470 | struct inode *inode = req->wb_context->dentry->d_inode; | |
471 | struct nfs_inode *nfsi = NFS_I(inode); | |
472 | ||
473 | spin_lock(&nfsi->req_lock); | |
474 | nfs_list_add_request(req, &nfsi->commit); | |
475 | nfsi->ncommit++; | |
476 | spin_unlock(&nfsi->req_lock); | |
fd39fc85 | 477 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
1da177e4 LT |
478 | mark_inode_dirty(inode); |
479 | } | |
480 | #endif | |
481 | ||
482 | /* | |
483 | * Wait for a request to complete. | |
484 | * | |
485 | * Interruptible by signals only if mounted with intr flag. | |
486 | */ | |
c42de9dd | 487 | static int nfs_wait_on_requests_locked(struct inode *inode, unsigned long idx_start, unsigned int npages) |
1da177e4 LT |
488 | { |
489 | struct nfs_inode *nfsi = NFS_I(inode); | |
490 | struct nfs_page *req; | |
491 | unsigned long idx_end, next; | |
492 | unsigned int res = 0; | |
493 | int error; | |
494 | ||
495 | if (npages == 0) | |
496 | idx_end = ~0; | |
497 | else | |
498 | idx_end = idx_start + npages - 1; | |
499 | ||
1da177e4 | 500 | next = idx_start; |
c6a556b8 | 501 | while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_WRITEBACK)) { |
1da177e4 LT |
502 | if (req->wb_index > idx_end) |
503 | break; | |
504 | ||
505 | next = req->wb_index + 1; | |
c6a556b8 | 506 | BUG_ON(!NFS_WBACK_BUSY(req)); |
1da177e4 LT |
507 | |
508 | atomic_inc(&req->wb_count); | |
509 | spin_unlock(&nfsi->req_lock); | |
510 | error = nfs_wait_on_request(req); | |
511 | nfs_release_request(req); | |
c42de9dd | 512 | spin_lock(&nfsi->req_lock); |
1da177e4 LT |
513 | if (error < 0) |
514 | return error; | |
1da177e4 LT |
515 | res++; |
516 | } | |
1da177e4 LT |
517 | return res; |
518 | } | |
519 | ||
c42de9dd TM |
520 | static int nfs_wait_on_requests(struct inode *inode, unsigned long idx_start, unsigned int npages) |
521 | { | |
522 | struct nfs_inode *nfsi = NFS_I(inode); | |
523 | int ret; | |
524 | ||
525 | spin_lock(&nfsi->req_lock); | |
526 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); | |
527 | spin_unlock(&nfsi->req_lock); | |
528 | return ret; | |
529 | } | |
530 | ||
83715ad5 | 531 | static void nfs_cancel_dirty_list(struct list_head *head) |
d2ccddf0 TM |
532 | { |
533 | struct nfs_page *req; | |
534 | while(!list_empty(head)) { | |
535 | req = nfs_list_entry(head->next); | |
536 | nfs_list_remove_request(req); | |
537 | nfs_inode_remove_request(req); | |
538 | nfs_clear_page_writeback(req); | |
539 | } | |
540 | } | |
541 | ||
83715ad5 TM |
542 | static void nfs_cancel_commit_list(struct list_head *head) |
543 | { | |
544 | struct nfs_page *req; | |
545 | ||
546 | while(!list_empty(head)) { | |
547 | req = nfs_list_entry(head->next); | |
b6dff26a | 548 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
83715ad5 TM |
549 | nfs_list_remove_request(req); |
550 | nfs_inode_remove_request(req); | |
b6dff26a | 551 | nfs_unlock_request(req); |
83715ad5 TM |
552 | } |
553 | } | |
554 | ||
1da177e4 LT |
555 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
556 | /* | |
557 | * nfs_scan_commit - Scan an inode for commit requests | |
558 | * @inode: NFS inode to scan | |
559 | * @dst: destination list | |
560 | * @idx_start: lower bound of page->index to scan. | |
561 | * @npages: idx_start + npages sets the upper bound to scan. | |
562 | * | |
563 | * Moves requests from the inode's 'commit' request list. | |
564 | * The requests are *not* checked to ensure that they form a contiguous set. | |
565 | */ | |
566 | static int | |
567 | nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
568 | { | |
569 | struct nfs_inode *nfsi = NFS_I(inode); | |
3da28eb1 TM |
570 | int res = 0; |
571 | ||
572 | if (nfsi->ncommit != 0) { | |
d2ccddf0 | 573 | res = nfs_scan_list(nfsi, &nfsi->commit, dst, idx_start, npages); |
3da28eb1 TM |
574 | nfsi->ncommit -= res; |
575 | if ((nfsi->ncommit == 0) != list_empty(&nfsi->commit)) | |
576 | printk(KERN_ERR "NFS: desynchronized value of nfs_i.ncommit.\n"); | |
577 | } | |
1da177e4 LT |
578 | return res; |
579 | } | |
c42de9dd TM |
580 | #else |
581 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
582 | { | |
583 | return 0; | |
584 | } | |
1da177e4 LT |
585 | #endif |
586 | ||
587 | static int nfs_wait_on_write_congestion(struct address_space *mapping, int intr) | |
588 | { | |
589 | struct backing_dev_info *bdi = mapping->backing_dev_info; | |
590 | DEFINE_WAIT(wait); | |
591 | int ret = 0; | |
592 | ||
593 | might_sleep(); | |
594 | ||
595 | if (!bdi_write_congested(bdi)) | |
596 | return 0; | |
91d5b470 CL |
597 | |
598 | nfs_inc_stats(mapping->host, NFSIOS_CONGESTIONWAIT); | |
599 | ||
1da177e4 LT |
600 | if (intr) { |
601 | struct rpc_clnt *clnt = NFS_CLIENT(mapping->host); | |
602 | sigset_t oldset; | |
603 | ||
604 | rpc_clnt_sigmask(clnt, &oldset); | |
605 | prepare_to_wait(&nfs_write_congestion, &wait, TASK_INTERRUPTIBLE); | |
606 | if (bdi_write_congested(bdi)) { | |
607 | if (signalled()) | |
608 | ret = -ERESTARTSYS; | |
609 | else | |
610 | schedule(); | |
611 | } | |
612 | rpc_clnt_sigunmask(clnt, &oldset); | |
613 | } else { | |
614 | prepare_to_wait(&nfs_write_congestion, &wait, TASK_UNINTERRUPTIBLE); | |
615 | if (bdi_write_congested(bdi)) | |
616 | schedule(); | |
617 | } | |
618 | finish_wait(&nfs_write_congestion, &wait); | |
619 | return ret; | |
620 | } | |
621 | ||
622 | ||
623 | /* | |
624 | * Try to update any existing write request, or create one if there is none. | |
625 | * In order to match, the request's credentials must match those of | |
626 | * the calling process. | |
627 | * | |
628 | * Note: Should always be called with the Page Lock held! | |
629 | */ | |
630 | static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, | |
e21195a7 | 631 | struct page *page, unsigned int offset, unsigned int bytes) |
1da177e4 | 632 | { |
e21195a7 | 633 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
634 | struct nfs_inode *nfsi = NFS_I(inode); |
635 | struct nfs_page *req, *new = NULL; | |
636 | unsigned long rqend, end; | |
637 | ||
638 | end = offset + bytes; | |
639 | ||
e21195a7 | 640 | if (nfs_wait_on_write_congestion(page->mapping, NFS_SERVER(inode)->flags & NFS_MOUNT_INTR)) |
1da177e4 LT |
641 | return ERR_PTR(-ERESTARTSYS); |
642 | for (;;) { | |
643 | /* Loop over all inode entries and see if we find | |
644 | * A request for the page we wish to update | |
645 | */ | |
646 | spin_lock(&nfsi->req_lock); | |
277459d2 | 647 | req = nfs_page_find_request_locked(page); |
1da177e4 LT |
648 | if (req) { |
649 | if (!nfs_lock_request_dontget(req)) { | |
650 | int error; | |
277459d2 | 651 | |
1da177e4 LT |
652 | spin_unlock(&nfsi->req_lock); |
653 | error = nfs_wait_on_request(req); | |
654 | nfs_release_request(req); | |
1dd594b2 NB |
655 | if (error < 0) { |
656 | if (new) | |
657 | nfs_release_request(new); | |
1da177e4 | 658 | return ERR_PTR(error); |
1dd594b2 | 659 | } |
1da177e4 LT |
660 | continue; |
661 | } | |
662 | spin_unlock(&nfsi->req_lock); | |
663 | if (new) | |
664 | nfs_release_request(new); | |
665 | break; | |
666 | } | |
667 | ||
668 | if (new) { | |
669 | int error; | |
670 | nfs_lock_request_dontget(new); | |
671 | error = nfs_inode_add_request(inode, new); | |
672 | if (error) { | |
673 | spin_unlock(&nfsi->req_lock); | |
674 | nfs_unlock_request(new); | |
675 | return ERR_PTR(error); | |
676 | } | |
677 | spin_unlock(&nfsi->req_lock); | |
1da177e4 LT |
678 | return new; |
679 | } | |
680 | spin_unlock(&nfsi->req_lock); | |
681 | ||
682 | new = nfs_create_request(ctx, inode, page, offset, bytes); | |
683 | if (IS_ERR(new)) | |
684 | return new; | |
685 | } | |
686 | ||
687 | /* We have a request for our page. | |
688 | * If the creds don't match, or the | |
689 | * page addresses don't match, | |
690 | * tell the caller to wait on the conflicting | |
691 | * request. | |
692 | */ | |
693 | rqend = req->wb_offset + req->wb_bytes; | |
694 | if (req->wb_context != ctx | |
695 | || req->wb_page != page | |
696 | || !nfs_dirty_request(req) | |
697 | || offset > rqend || end < req->wb_offset) { | |
698 | nfs_unlock_request(req); | |
699 | return ERR_PTR(-EBUSY); | |
700 | } | |
701 | ||
702 | /* Okay, the request matches. Update the region */ | |
703 | if (offset < req->wb_offset) { | |
704 | req->wb_offset = offset; | |
705 | req->wb_pgbase = offset; | |
706 | req->wb_bytes = rqend - req->wb_offset; | |
707 | } | |
708 | ||
709 | if (end > rqend) | |
710 | req->wb_bytes = end - req->wb_offset; | |
711 | ||
712 | return req; | |
713 | } | |
714 | ||
715 | int nfs_flush_incompatible(struct file *file, struct page *page) | |
716 | { | |
717 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 | 718 | struct nfs_page *req; |
1a54533e | 719 | int do_flush, status; |
1da177e4 LT |
720 | /* |
721 | * Look for a request corresponding to this page. If there | |
722 | * is one, and it belongs to another file, we flush it out | |
723 | * before we try to copy anything into the page. Do this | |
724 | * due to the lack of an ACCESS-type call in NFSv2. | |
725 | * Also do the same if we find a request from an existing | |
726 | * dropped page. | |
727 | */ | |
1a54533e TM |
728 | do { |
729 | req = nfs_page_find_request(page); | |
730 | if (req == NULL) | |
731 | return 0; | |
732 | do_flush = req->wb_page != page || req->wb_context != ctx | |
e261f51f | 733 | || !nfs_dirty_request(req); |
1da177e4 | 734 | nfs_release_request(req); |
1a54533e TM |
735 | if (!do_flush) |
736 | return 0; | |
737 | status = nfs_wb_page(page->mapping->host, page); | |
738 | } while (status == 0); | |
739 | return status; | |
1da177e4 LT |
740 | } |
741 | ||
742 | /* | |
743 | * Update and possibly write a cached page of an NFS file. | |
744 | * | |
745 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
746 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
747 | */ | |
748 | int nfs_updatepage(struct file *file, struct page *page, | |
749 | unsigned int offset, unsigned int count) | |
750 | { | |
751 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 | 752 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
753 | int status = 0; |
754 | ||
91d5b470 CL |
755 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
756 | ||
1da177e4 | 757 | dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", |
0bbacc40 CL |
758 | file->f_dentry->d_parent->d_name.name, |
759 | file->f_dentry->d_name.name, count, | |
760 | (long long)(page_offset(page) +offset)); | |
1da177e4 | 761 | |
1da177e4 LT |
762 | /* If we're not using byte range locks, and we know the page |
763 | * is entirely in cache, it may be more efficient to avoid | |
764 | * fragmenting write requests. | |
765 | */ | |
ab0a3dbe | 766 | if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) { |
49a70f27 | 767 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 768 | offset = 0; |
1da177e4 LT |
769 | } |
770 | ||
e21195a7 | 771 | status = nfs_writepage_setup(ctx, page, offset, count); |
e261f51f | 772 | __set_page_dirty_nobuffers(page); |
1da177e4 | 773 | |
1da177e4 LT |
774 | dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", |
775 | status, (long long)i_size_read(inode)); | |
776 | if (status < 0) | |
777 | ClearPageUptodate(page); | |
778 | return status; | |
779 | } | |
780 | ||
781 | static void nfs_writepage_release(struct nfs_page *req) | |
782 | { | |
783 | end_page_writeback(req->wb_page); | |
784 | ||
785 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
786 | if (!PageError(req->wb_page)) { | |
787 | if (NFS_NEED_RESCHED(req)) { | |
61822ab5 | 788 | nfs_redirty_request(req); |
1da177e4 LT |
789 | goto out; |
790 | } else if (NFS_NEED_COMMIT(req)) { | |
791 | nfs_mark_request_commit(req); | |
792 | goto out; | |
793 | } | |
794 | } | |
795 | nfs_inode_remove_request(req); | |
796 | ||
797 | out: | |
798 | nfs_clear_commit(req); | |
799 | nfs_clear_reschedule(req); | |
800 | #else | |
801 | nfs_inode_remove_request(req); | |
802 | #endif | |
c6a556b8 | 803 | nfs_clear_page_writeback(req); |
1da177e4 LT |
804 | } |
805 | ||
806 | static inline int flush_task_priority(int how) | |
807 | { | |
808 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
809 | case FLUSH_HIGHPRI: | |
810 | return RPC_PRIORITY_HIGH; | |
811 | case FLUSH_LOWPRI: | |
812 | return RPC_PRIORITY_LOW; | |
813 | } | |
814 | return RPC_PRIORITY_NORMAL; | |
815 | } | |
816 | ||
817 | /* | |
818 | * Set up the argument/result storage required for the RPC call. | |
819 | */ | |
820 | static void nfs_write_rpcsetup(struct nfs_page *req, | |
821 | struct nfs_write_data *data, | |
788e7a89 | 822 | const struct rpc_call_ops *call_ops, |
1da177e4 LT |
823 | unsigned int count, unsigned int offset, |
824 | int how) | |
825 | { | |
1da177e4 | 826 | struct inode *inode; |
788e7a89 | 827 | int flags; |
1da177e4 LT |
828 | |
829 | /* Set up the RPC argument and reply structs | |
830 | * NB: take care not to mess about with data->commit et al. */ | |
831 | ||
832 | data->req = req; | |
833 | data->inode = inode = req->wb_context->dentry->d_inode; | |
834 | data->cred = req->wb_context->cred; | |
835 | ||
836 | data->args.fh = NFS_FH(inode); | |
837 | data->args.offset = req_offset(req) + offset; | |
838 | data->args.pgbase = req->wb_pgbase + offset; | |
839 | data->args.pages = data->pagevec; | |
840 | data->args.count = count; | |
841 | data->args.context = req->wb_context; | |
842 | ||
843 | data->res.fattr = &data->fattr; | |
844 | data->res.count = count; | |
845 | data->res.verf = &data->verf; | |
0e574af1 | 846 | nfs_fattr_init(&data->fattr); |
1da177e4 | 847 | |
788e7a89 TM |
848 | /* Set up the initial task struct. */ |
849 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
850 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data); | |
1da177e4 LT |
851 | NFS_PROTO(inode)->write_setup(data, how); |
852 | ||
853 | data->task.tk_priority = flush_task_priority(how); | |
854 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 LT |
855 | |
856 | dprintk("NFS: %4d initiated write call (req %s/%Ld, %u bytes @ offset %Lu)\n", | |
0bbacc40 | 857 | data->task.tk_pid, |
1da177e4 LT |
858 | inode->i_sb->s_id, |
859 | (long long)NFS_FILEID(inode), | |
860 | count, | |
861 | (unsigned long long)data->args.offset); | |
862 | } | |
863 | ||
864 | static void nfs_execute_write(struct nfs_write_data *data) | |
865 | { | |
866 | struct rpc_clnt *clnt = NFS_CLIENT(data->inode); | |
867 | sigset_t oldset; | |
868 | ||
869 | rpc_clnt_sigmask(clnt, &oldset); | |
1da177e4 | 870 | rpc_execute(&data->task); |
1da177e4 LT |
871 | rpc_clnt_sigunmask(clnt, &oldset); |
872 | } | |
873 | ||
874 | /* | |
875 | * Generate multiple small requests to write out a single | |
876 | * contiguous dirty area on one page. | |
877 | */ | |
7d46a49f | 878 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
879 | { |
880 | struct nfs_page *req = nfs_list_entry(head->next); | |
881 | struct page *page = req->wb_page; | |
882 | struct nfs_write_data *data; | |
e9f7bee1 TM |
883 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
884 | unsigned int offset; | |
1da177e4 LT |
885 | int requests = 0; |
886 | LIST_HEAD(list); | |
887 | ||
888 | nfs_list_remove_request(req); | |
889 | ||
890 | nbytes = req->wb_bytes; | |
e9f7bee1 TM |
891 | do { |
892 | size_t len = min(nbytes, wsize); | |
893 | ||
894 | data = nfs_writedata_alloc(len); | |
1da177e4 LT |
895 | if (!data) |
896 | goto out_bad; | |
897 | list_add(&data->pages, &list); | |
898 | requests++; | |
e9f7bee1 TM |
899 | nbytes -= len; |
900 | } while (nbytes != 0); | |
1da177e4 LT |
901 | atomic_set(&req->wb_complete, requests); |
902 | ||
903 | ClearPageError(page); | |
1da177e4 LT |
904 | offset = 0; |
905 | nbytes = req->wb_bytes; | |
906 | do { | |
907 | data = list_entry(list.next, struct nfs_write_data, pages); | |
908 | list_del_init(&data->pages); | |
909 | ||
910 | data->pagevec[0] = page; | |
1da177e4 LT |
911 | |
912 | if (nbytes > wsize) { | |
788e7a89 TM |
913 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
914 | wsize, offset, how); | |
1da177e4 LT |
915 | offset += wsize; |
916 | nbytes -= wsize; | |
917 | } else { | |
788e7a89 TM |
918 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
919 | nbytes, offset, how); | |
1da177e4 LT |
920 | nbytes = 0; |
921 | } | |
922 | nfs_execute_write(data); | |
923 | } while (nbytes != 0); | |
924 | ||
925 | return 0; | |
926 | ||
927 | out_bad: | |
928 | while (!list_empty(&list)) { | |
929 | data = list_entry(list.next, struct nfs_write_data, pages); | |
930 | list_del(&data->pages); | |
8aca67f0 | 931 | nfs_writedata_release(data); |
1da177e4 | 932 | } |
61822ab5 | 933 | nfs_redirty_request(req); |
c6a556b8 | 934 | nfs_clear_page_writeback(req); |
1da177e4 LT |
935 | return -ENOMEM; |
936 | } | |
937 | ||
938 | /* | |
939 | * Create an RPC task for the given write request and kick it. | |
940 | * The page must have been locked by the caller. | |
941 | * | |
942 | * It may happen that the page we're passed is not marked dirty. | |
943 | * This is the case if nfs_updatepage detects a conflicting request | |
944 | * that has been written but not committed. | |
945 | */ | |
7d46a49f | 946 | static int nfs_flush_one(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
947 | { |
948 | struct nfs_page *req; | |
949 | struct page **pages; | |
950 | struct nfs_write_data *data; | |
951 | unsigned int count; | |
952 | ||
e9f7bee1 | 953 | data = nfs_writedata_alloc(NFS_SERVER(inode)->wsize); |
1da177e4 LT |
954 | if (!data) |
955 | goto out_bad; | |
956 | ||
957 | pages = data->pagevec; | |
958 | count = 0; | |
959 | while (!list_empty(head)) { | |
960 | req = nfs_list_entry(head->next); | |
961 | nfs_list_remove_request(req); | |
962 | nfs_list_add_request(req, &data->pages); | |
963 | ClearPageError(req->wb_page); | |
1da177e4 LT |
964 | *pages++ = req->wb_page; |
965 | count += req->wb_bytes; | |
966 | } | |
967 | req = nfs_list_entry(data->pages.next); | |
968 | ||
1da177e4 | 969 | /* Set up the argument struct */ |
788e7a89 | 970 | nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 LT |
971 | |
972 | nfs_execute_write(data); | |
973 | return 0; | |
974 | out_bad: | |
975 | while (!list_empty(head)) { | |
976 | struct nfs_page *req = nfs_list_entry(head->next); | |
977 | nfs_list_remove_request(req); | |
61822ab5 | 978 | nfs_redirty_request(req); |
c6a556b8 | 979 | nfs_clear_page_writeback(req); |
1da177e4 LT |
980 | } |
981 | return -ENOMEM; | |
982 | } | |
983 | ||
7d46a49f | 984 | static int nfs_flush_list(struct inode *inode, struct list_head *head, int npages, int how) |
1da177e4 LT |
985 | { |
986 | LIST_HEAD(one_request); | |
7d46a49f TM |
987 | int (*flush_one)(struct inode *, struct list_head *, int); |
988 | struct nfs_page *req; | |
989 | int wpages = NFS_SERVER(inode)->wpages; | |
990 | int wsize = NFS_SERVER(inode)->wsize; | |
991 | int error; | |
1da177e4 | 992 | |
7d46a49f TM |
993 | flush_one = nfs_flush_one; |
994 | if (wsize < PAGE_CACHE_SIZE) | |
995 | flush_one = nfs_flush_multi; | |
996 | /* For single writes, FLUSH_STABLE is more efficient */ | |
997 | if (npages <= wpages && npages == NFS_I(inode)->npages | |
998 | && nfs_list_entry(head->next)->wb_bytes <= wsize) | |
999 | how |= FLUSH_STABLE; | |
1000 | ||
1001 | do { | |
1002 | nfs_coalesce_requests(head, &one_request, wpages); | |
1da177e4 | 1003 | req = nfs_list_entry(one_request.next); |
7d46a49f | 1004 | error = flush_one(inode, &one_request, how); |
1da177e4 | 1005 | if (error < 0) |
7d46a49f TM |
1006 | goto out_err; |
1007 | } while (!list_empty(head)); | |
1008 | return 0; | |
1009 | out_err: | |
1da177e4 LT |
1010 | while (!list_empty(head)) { |
1011 | req = nfs_list_entry(head->next); | |
1012 | nfs_list_remove_request(req); | |
61822ab5 | 1013 | nfs_redirty_request(req); |
c6a556b8 | 1014 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1015 | } |
1016 | return error; | |
1017 | } | |
1018 | ||
1019 | /* | |
1020 | * Handle a write reply that flushed part of a page. | |
1021 | */ | |
788e7a89 | 1022 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 1023 | { |
788e7a89 | 1024 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
1025 | struct nfs_page *req = data->req; |
1026 | struct page *page = req->wb_page; | |
1027 | ||
1028 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
1029 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1030 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1031 | req->wb_bytes, | |
1032 | (long long)req_offset(req)); | |
1033 | ||
788e7a89 TM |
1034 | if (nfs_writeback_done(task, data) != 0) |
1035 | return; | |
1036 | ||
1037 | if (task->tk_status < 0) { | |
1da177e4 LT |
1038 | ClearPageUptodate(page); |
1039 | SetPageError(page); | |
788e7a89 TM |
1040 | req->wb_context->error = task->tk_status; |
1041 | dprintk(", error = %d\n", task->tk_status); | |
1da177e4 LT |
1042 | } else { |
1043 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
1044 | if (data->verf.committed < NFS_FILE_SYNC) { | |
1045 | if (!NFS_NEED_COMMIT(req)) { | |
1046 | nfs_defer_commit(req); | |
1047 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1048 | dprintk(" defer commit\n"); | |
1049 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
1050 | nfs_defer_reschedule(req); | |
1051 | dprintk(" server reboot detected\n"); | |
1052 | } | |
1053 | } else | |
1054 | #endif | |
1055 | dprintk(" OK\n"); | |
1056 | } | |
1057 | ||
1058 | if (atomic_dec_and_test(&req->wb_complete)) | |
1059 | nfs_writepage_release(req); | |
1060 | } | |
1061 | ||
788e7a89 TM |
1062 | static const struct rpc_call_ops nfs_write_partial_ops = { |
1063 | .rpc_call_done = nfs_writeback_done_partial, | |
1064 | .rpc_release = nfs_writedata_release, | |
1065 | }; | |
1066 | ||
1da177e4 LT |
1067 | /* |
1068 | * Handle a write reply that flushes a whole page. | |
1069 | * | |
1070 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
1071 | * writebacks since the page->count is kept > 1 for as long | |
1072 | * as the page has a write request pending. | |
1073 | */ | |
788e7a89 | 1074 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 1075 | { |
788e7a89 | 1076 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
1077 | struct nfs_page *req; |
1078 | struct page *page; | |
1079 | ||
788e7a89 TM |
1080 | if (nfs_writeback_done(task, data) != 0) |
1081 | return; | |
1082 | ||
1da177e4 LT |
1083 | /* Update attributes as result of writeback. */ |
1084 | while (!list_empty(&data->pages)) { | |
1085 | req = nfs_list_entry(data->pages.next); | |
1086 | nfs_list_remove_request(req); | |
1087 | page = req->wb_page; | |
1088 | ||
1089 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
1090 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1091 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1092 | req->wb_bytes, | |
1093 | (long long)req_offset(req)); | |
1094 | ||
788e7a89 | 1095 | if (task->tk_status < 0) { |
1da177e4 LT |
1096 | ClearPageUptodate(page); |
1097 | SetPageError(page); | |
788e7a89 | 1098 | req->wb_context->error = task->tk_status; |
1da177e4 LT |
1099 | end_page_writeback(page); |
1100 | nfs_inode_remove_request(req); | |
788e7a89 | 1101 | dprintk(", error = %d\n", task->tk_status); |
1da177e4 LT |
1102 | goto next; |
1103 | } | |
1104 | end_page_writeback(page); | |
1105 | ||
1106 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
1107 | if (data->args.stable != NFS_UNSTABLE || data->verf.committed == NFS_FILE_SYNC) { | |
1108 | nfs_inode_remove_request(req); | |
1109 | dprintk(" OK\n"); | |
1110 | goto next; | |
1111 | } | |
1112 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1113 | nfs_mark_request_commit(req); | |
1114 | dprintk(" marked for commit\n"); | |
1115 | #else | |
1116 | nfs_inode_remove_request(req); | |
1117 | #endif | |
1118 | next: | |
c6a556b8 | 1119 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1120 | } |
1121 | } | |
1122 | ||
788e7a89 TM |
1123 | static const struct rpc_call_ops nfs_write_full_ops = { |
1124 | .rpc_call_done = nfs_writeback_done_full, | |
1125 | .rpc_release = nfs_writedata_release, | |
1126 | }; | |
1127 | ||
1128 | ||
1da177e4 LT |
1129 | /* |
1130 | * This function is called when the WRITE call is complete. | |
1131 | */ | |
462d5b32 | 1132 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1133 | { |
1da177e4 LT |
1134 | struct nfs_writeargs *argp = &data->args; |
1135 | struct nfs_writeres *resp = &data->res; | |
788e7a89 | 1136 | int status; |
1da177e4 LT |
1137 | |
1138 | dprintk("NFS: %4d nfs_writeback_done (status %d)\n", | |
1139 | task->tk_pid, task->tk_status); | |
1140 | ||
f551e44f CL |
1141 | /* |
1142 | * ->write_done will attempt to use post-op attributes to detect | |
1143 | * conflicting writes by other clients. A strict interpretation | |
1144 | * of close-to-open would allow us to continue caching even if | |
1145 | * another writer had changed the file, but some applications | |
1146 | * depend on tighter cache coherency when writing. | |
1147 | */ | |
788e7a89 TM |
1148 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1149 | if (status != 0) | |
1150 | return status; | |
91d5b470 CL |
1151 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1152 | ||
1da177e4 LT |
1153 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1154 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1155 | /* We tried a write call, but the server did not | |
1156 | * commit data to stable storage even though we | |
1157 | * requested it. | |
1158 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1159 | * the server reports NFS_DATA_SYNC, but performs | |
1160 | * NFS_FILE_SYNC. We therefore implement this checking | |
1161 | * as a dprintk() in order to avoid filling syslog. | |
1162 | */ | |
1163 | static unsigned long complain; | |
1164 | ||
1165 | if (time_before(complain, jiffies)) { | |
1166 | dprintk("NFS: faulty NFS server %s:" | |
1167 | " (committed = %d) != (stable = %d)\n", | |
54ceac45 | 1168 | NFS_SERVER(data->inode)->nfs_client->cl_hostname, |
1da177e4 LT |
1169 | resp->verf->committed, argp->stable); |
1170 | complain = jiffies + 300 * HZ; | |
1171 | } | |
1172 | } | |
1173 | #endif | |
1174 | /* Is this a short write? */ | |
1175 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1176 | static unsigned long complain; | |
1177 | ||
91d5b470 CL |
1178 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1179 | ||
1da177e4 LT |
1180 | /* Has the server at least made some progress? */ |
1181 | if (resp->count != 0) { | |
1182 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1183 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1184 | /* Resend from where the server left off */ | |
1185 | argp->offset += resp->count; | |
1186 | argp->pgbase += resp->count; | |
1187 | argp->count -= resp->count; | |
1188 | } else { | |
1189 | /* Resend as a stable write in order to avoid | |
1190 | * headaches in the case of a server crash. | |
1191 | */ | |
1192 | argp->stable = NFS_FILE_SYNC; | |
1193 | } | |
1194 | rpc_restart_call(task); | |
788e7a89 | 1195 | return -EAGAIN; |
1da177e4 LT |
1196 | } |
1197 | if (time_before(complain, jiffies)) { | |
1198 | printk(KERN_WARNING | |
1199 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1200 | argp->count); | |
1201 | complain = jiffies + 300 * HZ; | |
1202 | } | |
1203 | /* Can't do anything about it except throw an error. */ | |
1204 | task->tk_status = -EIO; | |
1205 | } | |
788e7a89 | 1206 | return 0; |
1da177e4 LT |
1207 | } |
1208 | ||
1209 | ||
1210 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
963d8fe5 | 1211 | void nfs_commit_release(void *wdata) |
1da177e4 | 1212 | { |
1da177e4 LT |
1213 | nfs_commit_free(wdata); |
1214 | } | |
1215 | ||
1216 | /* | |
1217 | * Set up the argument/result storage required for the RPC call. | |
1218 | */ | |
1219 | static void nfs_commit_rpcsetup(struct list_head *head, | |
788e7a89 TM |
1220 | struct nfs_write_data *data, |
1221 | int how) | |
1da177e4 | 1222 | { |
3da28eb1 | 1223 | struct nfs_page *first; |
1da177e4 | 1224 | struct inode *inode; |
788e7a89 | 1225 | int flags; |
1da177e4 LT |
1226 | |
1227 | /* Set up the RPC argument and reply structs | |
1228 | * NB: take care not to mess about with data->commit et al. */ | |
1229 | ||
1230 | list_splice_init(head, &data->pages); | |
1231 | first = nfs_list_entry(data->pages.next); | |
1da177e4 LT |
1232 | inode = first->wb_context->dentry->d_inode; |
1233 | ||
1da177e4 LT |
1234 | data->inode = inode; |
1235 | data->cred = first->wb_context->cred; | |
1236 | ||
1237 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1238 | /* Note: we always request a commit of the entire inode */ |
1239 | data->args.offset = 0; | |
1240 | data->args.count = 0; | |
1241 | data->res.count = 0; | |
1da177e4 LT |
1242 | data->res.fattr = &data->fattr; |
1243 | data->res.verf = &data->verf; | |
0e574af1 | 1244 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1245 | |
1246 | /* Set up the initial task struct. */ | |
1247 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
1248 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data); | |
1da177e4 LT |
1249 | NFS_PROTO(inode)->commit_setup(data, how); |
1250 | ||
1251 | data->task.tk_priority = flush_task_priority(how); | |
1252 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 1253 | |
0bbacc40 | 1254 | dprintk("NFS: %4d initiated commit call\n", data->task.tk_pid); |
1da177e4 LT |
1255 | } |
1256 | ||
1257 | /* | |
1258 | * Commit dirty pages | |
1259 | */ | |
1260 | static int | |
40859d7e | 1261 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1262 | { |
1263 | struct nfs_write_data *data; | |
1264 | struct nfs_page *req; | |
1265 | ||
e9f7bee1 | 1266 | data = nfs_commit_alloc(); |
1da177e4 LT |
1267 | |
1268 | if (!data) | |
1269 | goto out_bad; | |
1270 | ||
1271 | /* Set up the argument struct */ | |
1272 | nfs_commit_rpcsetup(head, data, how); | |
1273 | ||
1274 | nfs_execute_write(data); | |
1275 | return 0; | |
1276 | out_bad: | |
1277 | while (!list_empty(head)) { | |
1278 | req = nfs_list_entry(head->next); | |
1279 | nfs_list_remove_request(req); | |
1280 | nfs_mark_request_commit(req); | |
83715ad5 | 1281 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
5c2d97cb | 1282 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1283 | } |
1284 | return -ENOMEM; | |
1285 | } | |
1286 | ||
1287 | /* | |
1288 | * COMMIT call returned | |
1289 | */ | |
788e7a89 | 1290 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1291 | { |
963d8fe5 | 1292 | struct nfs_write_data *data = calldata; |
1da177e4 | 1293 | struct nfs_page *req; |
1da177e4 LT |
1294 | |
1295 | dprintk("NFS: %4d nfs_commit_done (status %d)\n", | |
1296 | task->tk_pid, task->tk_status); | |
1297 | ||
788e7a89 TM |
1298 | /* Call the NFS version-specific code */ |
1299 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1300 | return; | |
1301 | ||
1da177e4 LT |
1302 | while (!list_empty(&data->pages)) { |
1303 | req = nfs_list_entry(data->pages.next); | |
1304 | nfs_list_remove_request(req); | |
fd39fc85 | 1305 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
1da177e4 LT |
1306 | |
1307 | dprintk("NFS: commit (%s/%Ld %d@%Ld)", | |
1308 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1309 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1310 | req->wb_bytes, | |
1311 | (long long)req_offset(req)); | |
1312 | if (task->tk_status < 0) { | |
1313 | req->wb_context->error = task->tk_status; | |
1314 | nfs_inode_remove_request(req); | |
1315 | dprintk(", error = %d\n", task->tk_status); | |
1316 | goto next; | |
1317 | } | |
1318 | ||
1319 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1320 | * returned by the server against all stored verfs. */ | |
1321 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1322 | /* We have a match */ | |
1323 | nfs_inode_remove_request(req); | |
1324 | dprintk(" OK\n"); | |
1325 | goto next; | |
1326 | } | |
1327 | /* We have a mismatch. Write the page again */ | |
1328 | dprintk(" mismatch\n"); | |
61822ab5 | 1329 | nfs_redirty_request(req); |
1da177e4 | 1330 | next: |
c6a556b8 | 1331 | nfs_clear_page_writeback(req); |
1da177e4 | 1332 | } |
1da177e4 | 1333 | } |
788e7a89 TM |
1334 | |
1335 | static const struct rpc_call_ops nfs_commit_ops = { | |
1336 | .rpc_call_done = nfs_commit_done, | |
1337 | .rpc_release = nfs_commit_release, | |
1338 | }; | |
c42de9dd TM |
1339 | #else |
1340 | static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) | |
1341 | { | |
1342 | return 0; | |
1343 | } | |
1da177e4 LT |
1344 | #endif |
1345 | ||
3f442547 | 1346 | static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1347 | { |
28c6925f | 1348 | struct nfs_inode *nfsi = NFS_I(mapping->host); |
1da177e4 | 1349 | LIST_HEAD(head); |
3f442547 | 1350 | long res; |
1da177e4 LT |
1351 | |
1352 | spin_lock(&nfsi->req_lock); | |
3f442547 | 1353 | res = nfs_scan_dirty(mapping, wbc, &head); |
1da177e4 | 1354 | spin_unlock(&nfsi->req_lock); |
ab0a3dbe | 1355 | if (res) { |
28c6925f | 1356 | int error = nfs_flush_list(mapping->host, &head, res, how); |
7d46a49f TM |
1357 | if (error < 0) |
1358 | return error; | |
ab0a3dbe | 1359 | } |
1da177e4 LT |
1360 | return res; |
1361 | } | |
1362 | ||
1363 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
3da28eb1 | 1364 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 LT |
1365 | { |
1366 | struct nfs_inode *nfsi = NFS_I(inode); | |
1367 | LIST_HEAD(head); | |
7d46a49f | 1368 | int res; |
1da177e4 LT |
1369 | |
1370 | spin_lock(&nfsi->req_lock); | |
3da28eb1 TM |
1371 | res = nfs_scan_commit(inode, &head, 0, 0); |
1372 | spin_unlock(&nfsi->req_lock); | |
1da177e4 | 1373 | if (res) { |
7d46a49f | 1374 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1375 | if (error < 0) |
1376 | return error; | |
1377 | } | |
1da177e4 LT |
1378 | return res; |
1379 | } | |
1380 | #endif | |
1381 | ||
1c75950b | 1382 | long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1383 | { |
1c75950b | 1384 | struct inode *inode = mapping->host; |
c42de9dd | 1385 | struct nfs_inode *nfsi = NFS_I(inode); |
1c75950b TM |
1386 | unsigned long idx_start, idx_end; |
1387 | unsigned int npages = 0; | |
c42de9dd | 1388 | LIST_HEAD(head); |
70b9ecbd | 1389 | int nocommit = how & FLUSH_NOCOMMIT; |
3f442547 | 1390 | long pages, ret; |
1da177e4 | 1391 | |
1c75950b TM |
1392 | /* FIXME */ |
1393 | if (wbc->range_cyclic) | |
1394 | idx_start = 0; | |
1395 | else { | |
1396 | idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1397 | idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1398 | if (idx_end > idx_start) { | |
1399 | unsigned long l_npages = 1 + idx_end - idx_start; | |
1400 | npages = l_npages; | |
1401 | if (sizeof(npages) != sizeof(l_npages) && | |
1402 | (unsigned long)npages != l_npages) | |
1403 | npages = 0; | |
1404 | } | |
1405 | } | |
c42de9dd TM |
1406 | how &= ~FLUSH_NOCOMMIT; |
1407 | spin_lock(&nfsi->req_lock); | |
1da177e4 | 1408 | do { |
1c75950b | 1409 | wbc->pages_skipped = 0; |
c42de9dd TM |
1410 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); |
1411 | if (ret != 0) | |
70b9ecbd | 1412 | continue; |
1c75950b | 1413 | pages = nfs_scan_dirty(mapping, wbc, &head); |
c42de9dd TM |
1414 | if (pages != 0) { |
1415 | spin_unlock(&nfsi->req_lock); | |
e8e058e8 | 1416 | if (how & FLUSH_INVALIDATE) { |
83715ad5 | 1417 | nfs_cancel_dirty_list(&head); |
e8e058e8 TM |
1418 | ret = pages; |
1419 | } else | |
d2ccddf0 | 1420 | ret = nfs_flush_list(inode, &head, pages, how); |
c42de9dd TM |
1421 | spin_lock(&nfsi->req_lock); |
1422 | continue; | |
1423 | } | |
1c75950b TM |
1424 | if (wbc->pages_skipped != 0) |
1425 | continue; | |
c42de9dd TM |
1426 | if (nocommit) |
1427 | break; | |
d2ccddf0 | 1428 | pages = nfs_scan_commit(inode, &head, idx_start, npages); |
1c75950b TM |
1429 | if (pages == 0) { |
1430 | if (wbc->pages_skipped != 0) | |
1431 | continue; | |
c42de9dd | 1432 | break; |
1c75950b | 1433 | } |
d2ccddf0 TM |
1434 | if (how & FLUSH_INVALIDATE) { |
1435 | spin_unlock(&nfsi->req_lock); | |
83715ad5 | 1436 | nfs_cancel_commit_list(&head); |
e8e058e8 | 1437 | ret = pages; |
d2ccddf0 TM |
1438 | spin_lock(&nfsi->req_lock); |
1439 | continue; | |
1440 | } | |
1441 | pages += nfs_scan_commit(inode, &head, 0, 0); | |
c42de9dd TM |
1442 | spin_unlock(&nfsi->req_lock); |
1443 | ret = nfs_commit_list(inode, &head, how); | |
1444 | spin_lock(&nfsi->req_lock); | |
1445 | } while (ret >= 0); | |
1446 | spin_unlock(&nfsi->req_lock); | |
1447 | return ret; | |
1da177e4 LT |
1448 | } |
1449 | ||
1c75950b TM |
1450 | /* |
1451 | * flush the inode to disk. | |
1452 | */ | |
1453 | int nfs_wb_all(struct inode *inode) | |
1454 | { | |
1455 | struct address_space *mapping = inode->i_mapping; | |
1456 | struct writeback_control wbc = { | |
1457 | .bdi = mapping->backing_dev_info, | |
1458 | .sync_mode = WB_SYNC_ALL, | |
1459 | .nr_to_write = LONG_MAX, | |
61822ab5 | 1460 | .for_writepages = 1, |
1c75950b TM |
1461 | .range_cyclic = 1, |
1462 | }; | |
1463 | int ret; | |
1464 | ||
61822ab5 TM |
1465 | ret = generic_writepages(mapping, &wbc); |
1466 | if (ret < 0) | |
1467 | goto out; | |
1c75950b TM |
1468 | ret = nfs_sync_mapping_wait(mapping, &wbc, 0); |
1469 | if (ret >= 0) | |
1470 | return 0; | |
61822ab5 | 1471 | out: |
1c75950b TM |
1472 | return ret; |
1473 | } | |
1474 | ||
1475 | int nfs_sync_mapping_range(struct address_space *mapping, loff_t range_start, loff_t range_end, int how) | |
1476 | { | |
1477 | struct writeback_control wbc = { | |
1478 | .bdi = mapping->backing_dev_info, | |
1479 | .sync_mode = WB_SYNC_ALL, | |
1480 | .nr_to_write = LONG_MAX, | |
1481 | .range_start = range_start, | |
1482 | .range_end = range_end, | |
61822ab5 | 1483 | .for_writepages = 1, |
1c75950b TM |
1484 | }; |
1485 | int ret; | |
1486 | ||
61822ab5 TM |
1487 | if (!(how & FLUSH_NOWRITEPAGE)) { |
1488 | ret = generic_writepages(mapping, &wbc); | |
1489 | if (ret < 0) | |
1490 | goto out; | |
1491 | } | |
1c75950b TM |
1492 | ret = nfs_sync_mapping_wait(mapping, &wbc, how); |
1493 | if (ret >= 0) | |
1494 | return 0; | |
61822ab5 | 1495 | out: |
1c75950b TM |
1496 | return ret; |
1497 | } | |
1498 | ||
61822ab5 | 1499 | int nfs_wb_page_priority(struct inode *inode, struct page *page, int how) |
1c75950b TM |
1500 | { |
1501 | loff_t range_start = page_offset(page); | |
1502 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
4d770ccf TM |
1503 | struct writeback_control wbc = { |
1504 | .bdi = page->mapping->backing_dev_info, | |
1505 | .sync_mode = WB_SYNC_ALL, | |
1506 | .nr_to_write = LONG_MAX, | |
1507 | .range_start = range_start, | |
1508 | .range_end = range_end, | |
1509 | }; | |
1510 | int ret; | |
1c75950b | 1511 | |
4d770ccf TM |
1512 | BUG_ON(!PageLocked(page)); |
1513 | if (!(how & FLUSH_NOWRITEPAGE) && clear_page_dirty_for_io(page)) { | |
1514 | ret = nfs_writepage_locked(page, &wbc); | |
1515 | if (ret < 0) | |
1516 | goto out; | |
1517 | } | |
1518 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); | |
1519 | if (ret >= 0) | |
1520 | return 0; | |
1521 | out: | |
1522 | return ret; | |
1c75950b TM |
1523 | } |
1524 | ||
1525 | /* | |
1526 | * Write back all requests on one page - we do this before reading it. | |
1527 | */ | |
1528 | int nfs_wb_page(struct inode *inode, struct page* page) | |
1529 | { | |
4d770ccf | 1530 | return nfs_wb_page_priority(inode, page, FLUSH_STABLE); |
1c75950b TM |
1531 | } |
1532 | ||
1a54533e TM |
1533 | int nfs_set_page_dirty(struct page *page) |
1534 | { | |
1535 | struct nfs_page *req; | |
1536 | ||
1537 | req = nfs_page_find_request(page); | |
1538 | if (req != NULL) { | |
1539 | /* Mark any existing write requests for flushing */ | |
1540 | set_bit(PG_NEED_FLUSH, &req->wb_flags); | |
1541 | nfs_release_request(req); | |
1542 | } | |
1543 | return __set_page_dirty_nobuffers(page); | |
1544 | } | |
1545 | ||
1c75950b | 1546 | |
f7b422b1 | 1547 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1548 | { |
1549 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1550 | sizeof(struct nfs_write_data), | |
1551 | 0, SLAB_HWCACHE_ALIGN, | |
1552 | NULL, NULL); | |
1553 | if (nfs_wdata_cachep == NULL) | |
1554 | return -ENOMEM; | |
1555 | ||
93d2341c MD |
1556 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1557 | nfs_wdata_cachep); | |
1da177e4 LT |
1558 | if (nfs_wdata_mempool == NULL) |
1559 | return -ENOMEM; | |
1560 | ||
93d2341c MD |
1561 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1562 | nfs_wdata_cachep); | |
1da177e4 LT |
1563 | if (nfs_commit_mempool == NULL) |
1564 | return -ENOMEM; | |
1565 | ||
1566 | return 0; | |
1567 | } | |
1568 | ||
266bee88 | 1569 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1570 | { |
1571 | mempool_destroy(nfs_commit_mempool); | |
1572 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1573 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1574 | } |
1575 |