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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/write.c | |
3 | * | |
7c85d900 | 4 | * Write file data over NFS. |
1da177e4 LT |
5 | * |
6 | * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de> | |
7 | */ | |
8 | ||
1da177e4 LT |
9 | #include <linux/types.h> |
10 | #include <linux/slab.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/pagemap.h> | |
13 | #include <linux/file.h> | |
1da177e4 | 14 | #include <linux/writeback.h> |
89a09141 | 15 | #include <linux/swap.h> |
1da177e4 LT |
16 | |
17 | #include <linux/sunrpc/clnt.h> | |
18 | #include <linux/nfs_fs.h> | |
19 | #include <linux/nfs_mount.h> | |
20 | #include <linux/nfs_page.h> | |
3fcfab16 AM |
21 | #include <linux/backing-dev.h> |
22 | ||
1da177e4 LT |
23 | #include <asm/uaccess.h> |
24 | #include <linux/smp_lock.h> | |
25 | ||
26 | #include "delegation.h" | |
49a70f27 | 27 | #include "internal.h" |
91d5b470 | 28 | #include "iostat.h" |
1da177e4 LT |
29 | |
30 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE | |
31 | ||
32 | #define MIN_POOL_WRITE (32) | |
33 | #define MIN_POOL_COMMIT (4) | |
34 | ||
35 | /* | |
36 | * Local function declarations | |
37 | */ | |
38 | static struct nfs_page * nfs_update_request(struct nfs_open_context*, | |
1da177e4 LT |
39 | struct page *, |
40 | unsigned int, unsigned int); | |
3f442547 | 41 | static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how); |
788e7a89 TM |
42 | static const struct rpc_call_ops nfs_write_partial_ops; |
43 | static const struct rpc_call_ops nfs_write_full_ops; | |
44 | static const struct rpc_call_ops nfs_commit_ops; | |
1da177e4 | 45 | |
e18b890b | 46 | static struct kmem_cache *nfs_wdata_cachep; |
3feb2d49 | 47 | static mempool_t *nfs_wdata_mempool; |
1da177e4 LT |
48 | static mempool_t *nfs_commit_mempool; |
49 | ||
e9f7bee1 | 50 | struct nfs_write_data *nfs_commit_alloc(void) |
1da177e4 | 51 | { |
e6b4f8da | 52 | struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS); |
40859d7e | 53 | |
1da177e4 LT |
54 | if (p) { |
55 | memset(p, 0, sizeof(*p)); | |
56 | INIT_LIST_HEAD(&p->pages); | |
57 | } | |
58 | return p; | |
59 | } | |
60 | ||
8aca67f0 | 61 | void nfs_commit_rcu_free(struct rcu_head *head) |
1da177e4 | 62 | { |
8aca67f0 | 63 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
40859d7e CL |
64 | if (p && (p->pagevec != &p->page_array[0])) |
65 | kfree(p->pagevec); | |
1da177e4 LT |
66 | mempool_free(p, nfs_commit_mempool); |
67 | } | |
68 | ||
8aca67f0 TM |
69 | void nfs_commit_free(struct nfs_write_data *wdata) |
70 | { | |
71 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_commit_rcu_free); | |
72 | } | |
73 | ||
e9f7bee1 | 74 | struct nfs_write_data *nfs_writedata_alloc(size_t len) |
3feb2d49 | 75 | { |
e9f7bee1 | 76 | unsigned int pagecount = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
e6b4f8da | 77 | struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS); |
3feb2d49 TM |
78 | |
79 | if (p) { | |
80 | memset(p, 0, sizeof(*p)); | |
81 | INIT_LIST_HEAD(&p->pages); | |
e9f7bee1 | 82 | p->npages = pagecount; |
0d0b5cb3 CL |
83 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
84 | p->pagevec = p->page_array; | |
3feb2d49 | 85 | else { |
0d0b5cb3 CL |
86 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
87 | if (!p->pagevec) { | |
3feb2d49 TM |
88 | mempool_free(p, nfs_wdata_mempool); |
89 | p = NULL; | |
90 | } | |
91 | } | |
92 | } | |
93 | return p; | |
94 | } | |
95 | ||
8aca67f0 | 96 | static void nfs_writedata_rcu_free(struct rcu_head *head) |
3feb2d49 | 97 | { |
8aca67f0 | 98 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
3feb2d49 TM |
99 | if (p && (p->pagevec != &p->page_array[0])) |
100 | kfree(p->pagevec); | |
101 | mempool_free(p, nfs_wdata_mempool); | |
102 | } | |
103 | ||
8aca67f0 TM |
104 | static void nfs_writedata_free(struct nfs_write_data *wdata) |
105 | { | |
106 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_writedata_rcu_free); | |
107 | } | |
108 | ||
963d8fe5 | 109 | void nfs_writedata_release(void *wdata) |
1da177e4 | 110 | { |
1da177e4 LT |
111 | nfs_writedata_free(wdata); |
112 | } | |
113 | ||
277459d2 TM |
114 | static struct nfs_page *nfs_page_find_request_locked(struct page *page) |
115 | { | |
116 | struct nfs_page *req = NULL; | |
117 | ||
118 | if (PagePrivate(page)) { | |
119 | req = (struct nfs_page *)page_private(page); | |
120 | if (req != NULL) | |
121 | atomic_inc(&req->wb_count); | |
122 | } | |
123 | return req; | |
124 | } | |
125 | ||
126 | static struct nfs_page *nfs_page_find_request(struct page *page) | |
127 | { | |
128 | struct nfs_page *req = NULL; | |
129 | spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock; | |
130 | ||
131 | spin_lock(req_lock); | |
132 | req = nfs_page_find_request_locked(page); | |
133 | spin_unlock(req_lock); | |
134 | return req; | |
135 | } | |
136 | ||
1da177e4 LT |
137 | /* Adjust the file length if we're writing beyond the end */ |
138 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) | |
139 | { | |
140 | struct inode *inode = page->mapping->host; | |
141 | loff_t end, i_size = i_size_read(inode); | |
142 | unsigned long end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; | |
143 | ||
144 | if (i_size > 0 && page->index < end_index) | |
145 | return; | |
146 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); | |
147 | if (i_size >= end) | |
148 | return; | |
91d5b470 | 149 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
1da177e4 LT |
150 | i_size_write(inode, end); |
151 | } | |
152 | ||
a301b777 TM |
153 | /* A writeback failed: mark the page as bad, and invalidate the page cache */ |
154 | static void nfs_set_pageerror(struct page *page) | |
155 | { | |
156 | SetPageError(page); | |
157 | nfs_zap_mapping(page->mapping->host, page->mapping); | |
158 | } | |
159 | ||
1da177e4 LT |
160 | /* We can set the PG_uptodate flag if we see that a write request |
161 | * covers the full page. | |
162 | */ | |
163 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) | |
164 | { | |
1da177e4 LT |
165 | if (PageUptodate(page)) |
166 | return; | |
167 | if (base != 0) | |
168 | return; | |
49a70f27 | 169 | if (count != nfs_page_length(page)) |
1da177e4 | 170 | return; |
49a70f27 | 171 | if (count != PAGE_CACHE_SIZE) |
1da177e4 | 172 | memclear_highpage_flush(page, count, PAGE_CACHE_SIZE - count); |
49a70f27 | 173 | SetPageUptodate(page); |
1da177e4 LT |
174 | } |
175 | ||
e21195a7 | 176 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
1da177e4 LT |
177 | unsigned int offset, unsigned int count) |
178 | { | |
179 | struct nfs_page *req; | |
e21195a7 | 180 | int ret; |
1da177e4 | 181 | |
e21195a7 TM |
182 | for (;;) { |
183 | req = nfs_update_request(ctx, page, offset, count); | |
184 | if (!IS_ERR(req)) | |
185 | break; | |
186 | ret = PTR_ERR(req); | |
187 | if (ret != -EBUSY) | |
188 | return ret; | |
189 | ret = nfs_wb_page(page->mapping->host, page); | |
190 | if (ret != 0) | |
191 | return ret; | |
192 | } | |
1da177e4 LT |
193 | /* Update file length */ |
194 | nfs_grow_file(page, offset, count); | |
195 | /* Set the PG_uptodate flag? */ | |
196 | nfs_mark_uptodate(page, offset, count); | |
197 | nfs_unlock_request(req); | |
abd3e641 | 198 | return 0; |
1da177e4 LT |
199 | } |
200 | ||
201 | static int wb_priority(struct writeback_control *wbc) | |
202 | { | |
203 | if (wbc->for_reclaim) | |
204 | return FLUSH_HIGHPRI; | |
205 | if (wbc->for_kupdate) | |
206 | return FLUSH_LOWPRI; | |
207 | return 0; | |
208 | } | |
209 | ||
89a09141 PZ |
210 | /* |
211 | * NFS congestion control | |
212 | */ | |
213 | ||
214 | int nfs_congestion_kb; | |
215 | ||
216 | #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) | |
217 | #define NFS_CONGESTION_OFF_THRESH \ | |
218 | (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) | |
219 | ||
5a6d41b3 | 220 | static int nfs_set_page_writeback(struct page *page) |
89a09141 | 221 | { |
5a6d41b3 TM |
222 | int ret = test_set_page_writeback(page); |
223 | ||
224 | if (!ret) { | |
89a09141 PZ |
225 | struct inode *inode = page->mapping->host; |
226 | struct nfs_server *nfss = NFS_SERVER(inode); | |
227 | ||
228 | if (atomic_inc_return(&nfss->writeback) > | |
229 | NFS_CONGESTION_ON_THRESH) | |
230 | set_bdi_congested(&nfss->backing_dev_info, WRITE); | |
231 | } | |
5a6d41b3 | 232 | return ret; |
89a09141 PZ |
233 | } |
234 | ||
235 | static void nfs_end_page_writeback(struct page *page) | |
236 | { | |
237 | struct inode *inode = page->mapping->host; | |
238 | struct nfs_server *nfss = NFS_SERVER(inode); | |
239 | ||
240 | end_page_writeback(page); | |
241 | if (atomic_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) { | |
242 | clear_bdi_congested(&nfss->backing_dev_info, WRITE); | |
243 | congestion_end(WRITE); | |
244 | } | |
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; | |
612c9384 TM |
257 | struct nfs_inode *nfsi = NFS_I(page->mapping->host); |
258 | spinlock_t *req_lock = &nfsi->req_lock; | |
e261f51f TM |
259 | int ret; |
260 | ||
261 | spin_lock(req_lock); | |
262 | for(;;) { | |
263 | req = nfs_page_find_request_locked(page); | |
264 | if (req == NULL) { | |
265 | spin_unlock(req_lock); | |
266 | return 1; | |
267 | } | |
268 | if (nfs_lock_request_dontget(req)) | |
269 | break; | |
270 | /* Note: If we hold the page lock, as is the case in nfs_writepage, | |
271 | * then the call to nfs_lock_request_dontget() will always | |
272 | * succeed provided that someone hasn't already marked the | |
273 | * request as dirty (in which case we don't care). | |
274 | */ | |
275 | spin_unlock(req_lock); | |
276 | ret = nfs_wait_on_request(req); | |
277 | nfs_release_request(req); | |
278 | if (ret != 0) | |
279 | return ret; | |
280 | spin_lock(req_lock); | |
281 | } | |
612c9384 TM |
282 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
283 | /* This request is marked for commit */ | |
284 | spin_unlock(req_lock); | |
285 | nfs_unlock_request(req); | |
286 | return 1; | |
287 | } | |
eb4cac10 TM |
288 | if (nfs_set_page_writeback(page) == 0) { |
289 | nfs_list_remove_request(req); | |
612c9384 TM |
290 | /* add the request to the inode's dirty list. */ |
291 | radix_tree_tag_set(&nfsi->nfs_page_tree, | |
292 | req->wb_index, NFS_PAGE_TAG_DIRTY); | |
293 | nfs_list_add_request(req, &nfsi->dirty); | |
294 | nfsi->ndirty++; | |
295 | spin_unlock(req_lock); | |
296 | __mark_inode_dirty(page->mapping->host, I_DIRTY_PAGES); | |
297 | } else | |
298 | spin_unlock(req_lock); | |
e261f51f TM |
299 | ret = test_bit(PG_NEED_FLUSH, &req->wb_flags); |
300 | nfs_unlock_request(req); | |
301 | return ret; | |
302 | } | |
303 | ||
1da177e4 LT |
304 | /* |
305 | * Write an mmapped page to the server. | |
306 | */ | |
4d770ccf | 307 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
308 | { |
309 | struct nfs_open_context *ctx; | |
310 | struct inode *inode = page->mapping->host; | |
49a70f27 | 311 | unsigned offset; |
e261f51f | 312 | int err; |
1da177e4 | 313 | |
91d5b470 CL |
314 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
315 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
316 | ||
e261f51f TM |
317 | err = nfs_page_mark_flush(page); |
318 | if (err <= 0) | |
319 | goto out; | |
320 | err = 0; | |
49a70f27 TM |
321 | offset = nfs_page_length(page); |
322 | if (!offset) | |
1da177e4 | 323 | goto out; |
49a70f27 | 324 | |
d530838b | 325 | ctx = nfs_find_open_context(inode, NULL, FMODE_WRITE); |
1da177e4 LT |
326 | if (ctx == NULL) { |
327 | err = -EBADF; | |
328 | goto out; | |
329 | } | |
200baa21 | 330 | err = nfs_writepage_setup(ctx, page, 0, offset); |
1da177e4 | 331 | put_nfs_open_context(ctx); |
e261f51f TM |
332 | if (err != 0) |
333 | goto out; | |
334 | err = nfs_page_mark_flush(page); | |
335 | if (err > 0) | |
336 | err = 0; | |
1da177e4 | 337 | out: |
200baa21 | 338 | if (!wbc->for_writepages) |
02241bc4 | 339 | nfs_flush_mapping(page->mapping, wbc, FLUSH_STABLE|wb_priority(wbc)); |
4d770ccf TM |
340 | return err; |
341 | } | |
342 | ||
343 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
344 | { | |
345 | int err; | |
346 | ||
347 | err = nfs_writepage_locked(page, wbc); | |
1da177e4 | 348 | unlock_page(page); |
1da177e4 LT |
349 | return err; |
350 | } | |
351 | ||
1da177e4 LT |
352 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) |
353 | { | |
1da177e4 LT |
354 | struct inode *inode = mapping->host; |
355 | int err; | |
356 | ||
91d5b470 CL |
357 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
358 | ||
1da177e4 LT |
359 | err = generic_writepages(mapping, wbc); |
360 | if (err) | |
361 | return err; | |
28c6925f | 362 | err = nfs_flush_mapping(mapping, wbc, wb_priority(wbc)); |
1da177e4 LT |
363 | if (err < 0) |
364 | goto out; | |
91d5b470 | 365 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, err); |
d30c8348 | 366 | err = 0; |
1da177e4 | 367 | out: |
1da177e4 LT |
368 | return err; |
369 | } | |
370 | ||
371 | /* | |
372 | * Insert a write request into an inode | |
373 | */ | |
374 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) | |
375 | { | |
376 | struct nfs_inode *nfsi = NFS_I(inode); | |
377 | int error; | |
378 | ||
379 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); | |
380 | BUG_ON(error == -EEXIST); | |
381 | if (error) | |
382 | return error; | |
383 | if (!nfsi->npages) { | |
384 | igrab(inode); | |
385 | nfs_begin_data_update(inode); | |
386 | if (nfs_have_delegation(inode, FMODE_WRITE)) | |
387 | nfsi->change_attr++; | |
388 | } | |
deb7d638 | 389 | SetPagePrivate(req->wb_page); |
277459d2 | 390 | set_page_private(req->wb_page, (unsigned long)req); |
1da177e4 LT |
391 | nfsi->npages++; |
392 | atomic_inc(&req->wb_count); | |
393 | return 0; | |
394 | } | |
395 | ||
396 | /* | |
89a09141 | 397 | * Remove a write request from an inode |
1da177e4 LT |
398 | */ |
399 | static void nfs_inode_remove_request(struct nfs_page *req) | |
400 | { | |
401 | struct inode *inode = req->wb_context->dentry->d_inode; | |
402 | struct nfs_inode *nfsi = NFS_I(inode); | |
403 | ||
404 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
405 | ||
406 | spin_lock(&nfsi->req_lock); | |
277459d2 | 407 | set_page_private(req->wb_page, 0); |
deb7d638 | 408 | ClearPagePrivate(req->wb_page); |
1da177e4 LT |
409 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
410 | nfsi->npages--; | |
411 | if (!nfsi->npages) { | |
412 | spin_unlock(&nfsi->req_lock); | |
951a143b | 413 | nfs_end_data_update(inode); |
1da177e4 LT |
414 | iput(inode); |
415 | } else | |
416 | spin_unlock(&nfsi->req_lock); | |
417 | nfs_clear_request(req); | |
418 | nfs_release_request(req); | |
419 | } | |
420 | ||
61822ab5 TM |
421 | static void |
422 | nfs_redirty_request(struct nfs_page *req) | |
423 | { | |
61822ab5 TM |
424 | __set_page_dirty_nobuffers(req->wb_page); |
425 | } | |
426 | ||
1da177e4 LT |
427 | /* |
428 | * Check if a request is dirty | |
429 | */ | |
430 | static inline int | |
431 | nfs_dirty_request(struct nfs_page *req) | |
432 | { | |
5a6d41b3 TM |
433 | struct page *page = req->wb_page; |
434 | ||
612c9384 | 435 | if (page == NULL || test_bit(PG_NEED_COMMIT, &req->wb_flags)) |
5a6d41b3 TM |
436 | return 0; |
437 | return !PageWriteback(req->wb_page); | |
1da177e4 LT |
438 | } |
439 | ||
440 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
441 | /* | |
442 | * Add a request to the inode's commit list. | |
443 | */ | |
444 | static void | |
445 | nfs_mark_request_commit(struct nfs_page *req) | |
446 | { | |
447 | struct inode *inode = req->wb_context->dentry->d_inode; | |
448 | struct nfs_inode *nfsi = NFS_I(inode); | |
449 | ||
450 | spin_lock(&nfsi->req_lock); | |
451 | nfs_list_add_request(req, &nfsi->commit); | |
452 | nfsi->ncommit++; | |
612c9384 | 453 | set_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
1da177e4 | 454 | spin_unlock(&nfsi->req_lock); |
fd39fc85 | 455 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
a1803044 | 456 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1da177e4 | 457 | } |
8e821cad TM |
458 | |
459 | static inline | |
460 | int nfs_write_need_commit(struct nfs_write_data *data) | |
461 | { | |
462 | return data->verf.committed != NFS_FILE_SYNC; | |
463 | } | |
464 | ||
465 | static inline | |
466 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
467 | { | |
612c9384 | 468 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
8e821cad TM |
469 | nfs_mark_request_commit(req); |
470 | return 1; | |
471 | } | |
472 | if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { | |
473 | nfs_redirty_request(req); | |
474 | return 1; | |
475 | } | |
476 | return 0; | |
477 | } | |
478 | #else | |
479 | static inline void | |
480 | nfs_mark_request_commit(struct nfs_page *req) | |
481 | { | |
482 | } | |
483 | ||
484 | static inline | |
485 | int nfs_write_need_commit(struct nfs_write_data *data) | |
486 | { | |
487 | return 0; | |
488 | } | |
489 | ||
490 | static inline | |
491 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
492 | { | |
493 | return 0; | |
494 | } | |
1da177e4 LT |
495 | #endif |
496 | ||
497 | /* | |
498 | * Wait for a request to complete. | |
499 | * | |
500 | * Interruptible by signals only if mounted with intr flag. | |
501 | */ | |
c42de9dd | 502 | static int nfs_wait_on_requests_locked(struct inode *inode, unsigned long idx_start, unsigned int npages) |
1da177e4 LT |
503 | { |
504 | struct nfs_inode *nfsi = NFS_I(inode); | |
505 | struct nfs_page *req; | |
506 | unsigned long idx_end, next; | |
507 | unsigned int res = 0; | |
508 | int error; | |
509 | ||
510 | if (npages == 0) | |
511 | idx_end = ~0; | |
512 | else | |
513 | idx_end = idx_start + npages - 1; | |
514 | ||
1da177e4 | 515 | next = idx_start; |
c6a556b8 | 516 | while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_WRITEBACK)) { |
1da177e4 LT |
517 | if (req->wb_index > idx_end) |
518 | break; | |
519 | ||
520 | next = req->wb_index + 1; | |
c6a556b8 | 521 | BUG_ON(!NFS_WBACK_BUSY(req)); |
1da177e4 LT |
522 | |
523 | atomic_inc(&req->wb_count); | |
524 | spin_unlock(&nfsi->req_lock); | |
525 | error = nfs_wait_on_request(req); | |
526 | nfs_release_request(req); | |
c42de9dd | 527 | spin_lock(&nfsi->req_lock); |
1da177e4 LT |
528 | if (error < 0) |
529 | return error; | |
1da177e4 LT |
530 | res++; |
531 | } | |
1da177e4 LT |
532 | return res; |
533 | } | |
534 | ||
83715ad5 | 535 | static void nfs_cancel_dirty_list(struct list_head *head) |
d2ccddf0 TM |
536 | { |
537 | struct nfs_page *req; | |
538 | while(!list_empty(head)) { | |
539 | req = nfs_list_entry(head->next); | |
540 | nfs_list_remove_request(req); | |
5a6d41b3 | 541 | nfs_end_page_writeback(req->wb_page); |
d2ccddf0 TM |
542 | nfs_inode_remove_request(req); |
543 | nfs_clear_page_writeback(req); | |
544 | } | |
545 | } | |
546 | ||
83715ad5 TM |
547 | static void nfs_cancel_commit_list(struct list_head *head) |
548 | { | |
549 | struct nfs_page *req; | |
550 | ||
551 | while(!list_empty(head)) { | |
552 | req = nfs_list_entry(head->next); | |
b6dff26a | 553 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
83715ad5 | 554 | nfs_list_remove_request(req); |
612c9384 | 555 | clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
83715ad5 | 556 | nfs_inode_remove_request(req); |
b6dff26a | 557 | nfs_unlock_request(req); |
83715ad5 TM |
558 | } |
559 | } | |
560 | ||
1da177e4 LT |
561 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
562 | /* | |
563 | * nfs_scan_commit - Scan an inode for commit requests | |
564 | * @inode: NFS inode to scan | |
565 | * @dst: destination list | |
566 | * @idx_start: lower bound of page->index to scan. | |
567 | * @npages: idx_start + npages sets the upper bound to scan. | |
568 | * | |
569 | * Moves requests from the inode's 'commit' request list. | |
570 | * The requests are *not* checked to ensure that they form a contiguous set. | |
571 | */ | |
572 | static int | |
573 | nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
574 | { | |
575 | struct nfs_inode *nfsi = NFS_I(inode); | |
3da28eb1 TM |
576 | int res = 0; |
577 | ||
578 | if (nfsi->ncommit != 0) { | |
d2ccddf0 | 579 | res = nfs_scan_list(nfsi, &nfsi->commit, dst, idx_start, npages); |
3da28eb1 TM |
580 | nfsi->ncommit -= res; |
581 | if ((nfsi->ncommit == 0) != list_empty(&nfsi->commit)) | |
582 | printk(KERN_ERR "NFS: desynchronized value of nfs_i.ncommit.\n"); | |
583 | } | |
1da177e4 LT |
584 | return res; |
585 | } | |
c42de9dd TM |
586 | #else |
587 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
588 | { | |
589 | return 0; | |
590 | } | |
1da177e4 LT |
591 | #endif |
592 | ||
89a09141 | 593 | static int nfs_wait_on_write_congestion(struct address_space *mapping) |
1da177e4 | 594 | { |
89a09141 | 595 | struct inode *inode = mapping->host; |
1da177e4 | 596 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1da177e4 LT |
597 | int ret = 0; |
598 | ||
599 | might_sleep(); | |
600 | ||
601 | if (!bdi_write_congested(bdi)) | |
602 | return 0; | |
91d5b470 | 603 | |
89a09141 | 604 | nfs_inc_stats(inode, NFSIOS_CONGESTIONWAIT); |
91d5b470 | 605 | |
89a09141 PZ |
606 | do { |
607 | struct rpc_clnt *clnt = NFS_CLIENT(inode); | |
1da177e4 LT |
608 | sigset_t oldset; |
609 | ||
610 | rpc_clnt_sigmask(clnt, &oldset); | |
89a09141 | 611 | ret = congestion_wait_interruptible(WRITE, HZ/10); |
1da177e4 | 612 | rpc_clnt_sigunmask(clnt, &oldset); |
89a09141 PZ |
613 | if (ret == -ERESTARTSYS) |
614 | break; | |
615 | ret = 0; | |
616 | } while (bdi_write_congested(bdi)); | |
617 | ||
1da177e4 LT |
618 | return ret; |
619 | } | |
620 | ||
1da177e4 LT |
621 | /* |
622 | * Try to update any existing write request, or create one if there is none. | |
623 | * In order to match, the request's credentials must match those of | |
624 | * the calling process. | |
625 | * | |
626 | * Note: Should always be called with the Page Lock held! | |
627 | */ | |
628 | static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, | |
e21195a7 | 629 | struct page *page, unsigned int offset, unsigned int bytes) |
1da177e4 | 630 | { |
89a09141 PZ |
631 | struct address_space *mapping = page->mapping; |
632 | struct inode *inode = mapping->host; | |
1da177e4 LT |
633 | struct nfs_inode *nfsi = NFS_I(inode); |
634 | struct nfs_page *req, *new = NULL; | |
635 | unsigned long rqend, end; | |
636 | ||
637 | end = offset + bytes; | |
638 | ||
89a09141 | 639 | if (nfs_wait_on_write_congestion(mapping)) |
1da177e4 LT |
640 | return ERR_PTR(-ERESTARTSYS); |
641 | for (;;) { | |
642 | /* Loop over all inode entries and see if we find | |
643 | * A request for the page we wish to update | |
644 | */ | |
645 | spin_lock(&nfsi->req_lock); | |
277459d2 | 646 | req = nfs_page_find_request_locked(page); |
1da177e4 LT |
647 | if (req) { |
648 | if (!nfs_lock_request_dontget(req)) { | |
649 | int error; | |
277459d2 | 650 | |
1da177e4 LT |
651 | spin_unlock(&nfsi->req_lock); |
652 | error = nfs_wait_on_request(req); | |
653 | nfs_release_request(req); | |
1dd594b2 NB |
654 | if (error < 0) { |
655 | if (new) | |
656 | nfs_release_request(new); | |
1da177e4 | 657 | return ERR_PTR(error); |
1dd594b2 | 658 | } |
1da177e4 LT |
659 | continue; |
660 | } | |
661 | spin_unlock(&nfsi->req_lock); | |
662 | if (new) | |
663 | nfs_release_request(new); | |
664 | break; | |
665 | } | |
666 | ||
667 | if (new) { | |
668 | int error; | |
669 | nfs_lock_request_dontget(new); | |
670 | error = nfs_inode_add_request(inode, new); | |
671 | if (error) { | |
672 | spin_unlock(&nfsi->req_lock); | |
673 | nfs_unlock_request(new); | |
674 | return ERR_PTR(error); | |
675 | } | |
676 | spin_unlock(&nfsi->req_lock); | |
1da177e4 LT |
677 | return new; |
678 | } | |
679 | spin_unlock(&nfsi->req_lock); | |
680 | ||
681 | new = nfs_create_request(ctx, inode, page, offset, bytes); | |
682 | if (IS_ERR(new)) | |
683 | return new; | |
684 | } | |
685 | ||
686 | /* We have a request for our page. | |
687 | * If the creds don't match, or the | |
688 | * page addresses don't match, | |
689 | * tell the caller to wait on the conflicting | |
690 | * request. | |
691 | */ | |
692 | rqend = req->wb_offset + req->wb_bytes; | |
693 | if (req->wb_context != ctx | |
694 | || req->wb_page != page | |
695 | || !nfs_dirty_request(req) | |
696 | || offset > rqend || end < req->wb_offset) { | |
697 | nfs_unlock_request(req); | |
698 | return ERR_PTR(-EBUSY); | |
699 | } | |
700 | ||
701 | /* Okay, the request matches. Update the region */ | |
702 | if (offset < req->wb_offset) { | |
703 | req->wb_offset = offset; | |
704 | req->wb_pgbase = offset; | |
705 | req->wb_bytes = rqend - req->wb_offset; | |
706 | } | |
707 | ||
708 | if (end > rqend) | |
709 | req->wb_bytes = end - req->wb_offset; | |
710 | ||
711 | return req; | |
712 | } | |
713 | ||
714 | int nfs_flush_incompatible(struct file *file, struct page *page) | |
715 | { | |
716 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 | 717 | struct nfs_page *req; |
1a54533e | 718 | int do_flush, status; |
1da177e4 LT |
719 | /* |
720 | * Look for a request corresponding to this page. If there | |
721 | * is one, and it belongs to another file, we flush it out | |
722 | * before we try to copy anything into the page. Do this | |
723 | * due to the lack of an ACCESS-type call in NFSv2. | |
724 | * Also do the same if we find a request from an existing | |
725 | * dropped page. | |
726 | */ | |
1a54533e TM |
727 | do { |
728 | req = nfs_page_find_request(page); | |
729 | if (req == NULL) | |
730 | return 0; | |
731 | do_flush = req->wb_page != page || req->wb_context != ctx | |
e261f51f | 732 | || !nfs_dirty_request(req); |
1da177e4 | 733 | nfs_release_request(req); |
1a54533e TM |
734 | if (!do_flush) |
735 | return 0; | |
736 | status = nfs_wb_page(page->mapping->host, page); | |
737 | } while (status == 0); | |
738 | return status; | |
1da177e4 LT |
739 | } |
740 | ||
741 | /* | |
742 | * Update and possibly write a cached page of an NFS file. | |
743 | * | |
744 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
745 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
746 | */ | |
747 | int nfs_updatepage(struct file *file, struct page *page, | |
748 | unsigned int offset, unsigned int count) | |
749 | { | |
750 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 | 751 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
752 | int status = 0; |
753 | ||
91d5b470 CL |
754 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
755 | ||
1da177e4 | 756 | dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", |
01cce933 JJS |
757 | file->f_path.dentry->d_parent->d_name.name, |
758 | file->f_path.dentry->d_name.name, count, | |
0bbacc40 | 759 | (long long)(page_offset(page) +offset)); |
1da177e4 | 760 | |
1da177e4 LT |
761 | /* If we're not using byte range locks, and we know the page |
762 | * is entirely in cache, it may be more efficient to avoid | |
763 | * fragmenting write requests. | |
764 | */ | |
ab0a3dbe | 765 | if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) { |
49a70f27 | 766 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 767 | offset = 0; |
1da177e4 LT |
768 | } |
769 | ||
e21195a7 | 770 | status = nfs_writepage_setup(ctx, page, offset, count); |
e261f51f | 771 | __set_page_dirty_nobuffers(page); |
1da177e4 | 772 | |
1da177e4 LT |
773 | dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", |
774 | status, (long long)i_size_read(inode)); | |
775 | if (status < 0) | |
a301b777 | 776 | nfs_set_pageerror(page); |
1da177e4 LT |
777 | return status; |
778 | } | |
779 | ||
780 | static void nfs_writepage_release(struct nfs_page *req) | |
781 | { | |
1da177e4 | 782 | |
8e821cad TM |
783 | if (PageError(req->wb_page) || !nfs_reschedule_unstable_write(req)) { |
784 | nfs_end_page_writeback(req->wb_page); | |
785 | nfs_inode_remove_request(req); | |
786 | } else | |
787 | nfs_end_page_writeback(req->wb_page); | |
c6a556b8 | 788 | nfs_clear_page_writeback(req); |
1da177e4 LT |
789 | } |
790 | ||
791 | static inline int flush_task_priority(int how) | |
792 | { | |
793 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
794 | case FLUSH_HIGHPRI: | |
795 | return RPC_PRIORITY_HIGH; | |
796 | case FLUSH_LOWPRI: | |
797 | return RPC_PRIORITY_LOW; | |
798 | } | |
799 | return RPC_PRIORITY_NORMAL; | |
800 | } | |
801 | ||
802 | /* | |
803 | * Set up the argument/result storage required for the RPC call. | |
804 | */ | |
805 | static void nfs_write_rpcsetup(struct nfs_page *req, | |
806 | struct nfs_write_data *data, | |
788e7a89 | 807 | const struct rpc_call_ops *call_ops, |
1da177e4 LT |
808 | unsigned int count, unsigned int offset, |
809 | int how) | |
810 | { | |
1da177e4 | 811 | struct inode *inode; |
788e7a89 | 812 | int flags; |
1da177e4 LT |
813 | |
814 | /* Set up the RPC argument and reply structs | |
815 | * NB: take care not to mess about with data->commit et al. */ | |
816 | ||
817 | data->req = req; | |
818 | data->inode = inode = req->wb_context->dentry->d_inode; | |
819 | data->cred = req->wb_context->cred; | |
820 | ||
821 | data->args.fh = NFS_FH(inode); | |
822 | data->args.offset = req_offset(req) + offset; | |
823 | data->args.pgbase = req->wb_pgbase + offset; | |
824 | data->args.pages = data->pagevec; | |
825 | data->args.count = count; | |
826 | data->args.context = req->wb_context; | |
827 | ||
828 | data->res.fattr = &data->fattr; | |
829 | data->res.count = count; | |
830 | data->res.verf = &data->verf; | |
0e574af1 | 831 | nfs_fattr_init(&data->fattr); |
1da177e4 | 832 | |
788e7a89 TM |
833 | /* Set up the initial task struct. */ |
834 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
835 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data); | |
1da177e4 LT |
836 | NFS_PROTO(inode)->write_setup(data, how); |
837 | ||
838 | data->task.tk_priority = flush_task_priority(how); | |
839 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 840 | |
a3f565b1 CL |
841 | dprintk("NFS: %5u initiated write call " |
842 | "(req %s/%Ld, %u bytes @ offset %Lu)\n", | |
0bbacc40 | 843 | data->task.tk_pid, |
1da177e4 LT |
844 | inode->i_sb->s_id, |
845 | (long long)NFS_FILEID(inode), | |
846 | count, | |
847 | (unsigned long long)data->args.offset); | |
848 | } | |
849 | ||
850 | static void nfs_execute_write(struct nfs_write_data *data) | |
851 | { | |
852 | struct rpc_clnt *clnt = NFS_CLIENT(data->inode); | |
853 | sigset_t oldset; | |
854 | ||
855 | rpc_clnt_sigmask(clnt, &oldset); | |
1da177e4 | 856 | rpc_execute(&data->task); |
1da177e4 LT |
857 | rpc_clnt_sigunmask(clnt, &oldset); |
858 | } | |
859 | ||
860 | /* | |
861 | * Generate multiple small requests to write out a single | |
862 | * contiguous dirty area on one page. | |
863 | */ | |
7d46a49f | 864 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
865 | { |
866 | struct nfs_page *req = nfs_list_entry(head->next); | |
867 | struct page *page = req->wb_page; | |
868 | struct nfs_write_data *data; | |
e9f7bee1 TM |
869 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
870 | unsigned int offset; | |
1da177e4 LT |
871 | int requests = 0; |
872 | LIST_HEAD(list); | |
873 | ||
874 | nfs_list_remove_request(req); | |
875 | ||
876 | nbytes = req->wb_bytes; | |
e9f7bee1 TM |
877 | do { |
878 | size_t len = min(nbytes, wsize); | |
879 | ||
880 | data = nfs_writedata_alloc(len); | |
1da177e4 LT |
881 | if (!data) |
882 | goto out_bad; | |
883 | list_add(&data->pages, &list); | |
884 | requests++; | |
e9f7bee1 TM |
885 | nbytes -= len; |
886 | } while (nbytes != 0); | |
1da177e4 LT |
887 | atomic_set(&req->wb_complete, requests); |
888 | ||
889 | ClearPageError(page); | |
1da177e4 LT |
890 | offset = 0; |
891 | nbytes = req->wb_bytes; | |
892 | do { | |
893 | data = list_entry(list.next, struct nfs_write_data, pages); | |
894 | list_del_init(&data->pages); | |
895 | ||
896 | data->pagevec[0] = page; | |
1da177e4 LT |
897 | |
898 | if (nbytes > wsize) { | |
788e7a89 TM |
899 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
900 | wsize, offset, how); | |
1da177e4 LT |
901 | offset += wsize; |
902 | nbytes -= wsize; | |
903 | } else { | |
788e7a89 TM |
904 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
905 | nbytes, offset, how); | |
1da177e4 LT |
906 | nbytes = 0; |
907 | } | |
908 | nfs_execute_write(data); | |
909 | } while (nbytes != 0); | |
910 | ||
911 | return 0; | |
912 | ||
913 | out_bad: | |
914 | while (!list_empty(&list)) { | |
915 | data = list_entry(list.next, struct nfs_write_data, pages); | |
916 | list_del(&data->pages); | |
8aca67f0 | 917 | nfs_writedata_release(data); |
1da177e4 | 918 | } |
61822ab5 | 919 | nfs_redirty_request(req); |
6d677e35 | 920 | nfs_end_page_writeback(req->wb_page); |
c6a556b8 | 921 | nfs_clear_page_writeback(req); |
1da177e4 LT |
922 | return -ENOMEM; |
923 | } | |
924 | ||
925 | /* | |
926 | * Create an RPC task for the given write request and kick it. | |
927 | * The page must have been locked by the caller. | |
928 | * | |
929 | * It may happen that the page we're passed is not marked dirty. | |
930 | * This is the case if nfs_updatepage detects a conflicting request | |
931 | * that has been written but not committed. | |
932 | */ | |
7d46a49f | 933 | static int nfs_flush_one(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
934 | { |
935 | struct nfs_page *req; | |
936 | struct page **pages; | |
937 | struct nfs_write_data *data; | |
938 | unsigned int count; | |
939 | ||
e9f7bee1 | 940 | data = nfs_writedata_alloc(NFS_SERVER(inode)->wsize); |
1da177e4 LT |
941 | if (!data) |
942 | goto out_bad; | |
943 | ||
944 | pages = data->pagevec; | |
945 | count = 0; | |
946 | while (!list_empty(head)) { | |
947 | req = nfs_list_entry(head->next); | |
948 | nfs_list_remove_request(req); | |
949 | nfs_list_add_request(req, &data->pages); | |
950 | ClearPageError(req->wb_page); | |
1da177e4 LT |
951 | *pages++ = req->wb_page; |
952 | count += req->wb_bytes; | |
953 | } | |
954 | req = nfs_list_entry(data->pages.next); | |
955 | ||
1da177e4 | 956 | /* Set up the argument struct */ |
788e7a89 | 957 | nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 LT |
958 | |
959 | nfs_execute_write(data); | |
960 | return 0; | |
961 | out_bad: | |
962 | while (!list_empty(head)) { | |
963 | struct nfs_page *req = nfs_list_entry(head->next); | |
964 | nfs_list_remove_request(req); | |
61822ab5 | 965 | nfs_redirty_request(req); |
6d677e35 | 966 | nfs_end_page_writeback(req->wb_page); |
c6a556b8 | 967 | nfs_clear_page_writeback(req); |
1da177e4 LT |
968 | } |
969 | return -ENOMEM; | |
970 | } | |
971 | ||
7d46a49f | 972 | static int nfs_flush_list(struct inode *inode, struct list_head *head, int npages, int how) |
1da177e4 LT |
973 | { |
974 | LIST_HEAD(one_request); | |
7d46a49f TM |
975 | int (*flush_one)(struct inode *, struct list_head *, int); |
976 | struct nfs_page *req; | |
977 | int wpages = NFS_SERVER(inode)->wpages; | |
978 | int wsize = NFS_SERVER(inode)->wsize; | |
979 | int error; | |
1da177e4 | 980 | |
7d46a49f TM |
981 | flush_one = nfs_flush_one; |
982 | if (wsize < PAGE_CACHE_SIZE) | |
983 | flush_one = nfs_flush_multi; | |
984 | /* For single writes, FLUSH_STABLE is more efficient */ | |
985 | if (npages <= wpages && npages == NFS_I(inode)->npages | |
986 | && nfs_list_entry(head->next)->wb_bytes <= wsize) | |
987 | how |= FLUSH_STABLE; | |
988 | ||
989 | do { | |
990 | nfs_coalesce_requests(head, &one_request, wpages); | |
1da177e4 | 991 | req = nfs_list_entry(one_request.next); |
7d46a49f | 992 | error = flush_one(inode, &one_request, how); |
1da177e4 | 993 | if (error < 0) |
7d46a49f TM |
994 | goto out_err; |
995 | } while (!list_empty(head)); | |
996 | return 0; | |
997 | out_err: | |
1da177e4 LT |
998 | while (!list_empty(head)) { |
999 | req = nfs_list_entry(head->next); | |
1000 | nfs_list_remove_request(req); | |
61822ab5 | 1001 | nfs_redirty_request(req); |
6d677e35 | 1002 | nfs_end_page_writeback(req->wb_page); |
c6a556b8 | 1003 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1004 | } |
1005 | return error; | |
1006 | } | |
1007 | ||
1008 | /* | |
1009 | * Handle a write reply that flushed part of a page. | |
1010 | */ | |
788e7a89 | 1011 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 1012 | { |
788e7a89 | 1013 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
1014 | struct nfs_page *req = data->req; |
1015 | struct page *page = req->wb_page; | |
1016 | ||
1017 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
1018 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1019 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1020 | req->wb_bytes, | |
1021 | (long long)req_offset(req)); | |
1022 | ||
788e7a89 TM |
1023 | if (nfs_writeback_done(task, data) != 0) |
1024 | return; | |
1025 | ||
1026 | if (task->tk_status < 0) { | |
a301b777 | 1027 | nfs_set_pageerror(page); |
788e7a89 TM |
1028 | req->wb_context->error = task->tk_status; |
1029 | dprintk(", error = %d\n", task->tk_status); | |
8e821cad | 1030 | goto out; |
1da177e4 LT |
1031 | } |
1032 | ||
8e821cad TM |
1033 | if (nfs_write_need_commit(data)) { |
1034 | spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock; | |
1035 | ||
1036 | spin_lock(req_lock); | |
1037 | if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { | |
1038 | /* Do nothing we need to resend the writes */ | |
1039 | } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
1040 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1041 | dprintk(" defer commit\n"); | |
1042 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
1043 | set_bit(PG_NEED_RESCHED, &req->wb_flags); | |
1044 | clear_bit(PG_NEED_COMMIT, &req->wb_flags); | |
1045 | dprintk(" server reboot detected\n"); | |
1046 | } | |
1047 | spin_unlock(req_lock); | |
1048 | } else | |
1049 | dprintk(" OK\n"); | |
1050 | ||
1051 | out: | |
1da177e4 LT |
1052 | if (atomic_dec_and_test(&req->wb_complete)) |
1053 | nfs_writepage_release(req); | |
1054 | } | |
1055 | ||
788e7a89 TM |
1056 | static const struct rpc_call_ops nfs_write_partial_ops = { |
1057 | .rpc_call_done = nfs_writeback_done_partial, | |
1058 | .rpc_release = nfs_writedata_release, | |
1059 | }; | |
1060 | ||
1da177e4 LT |
1061 | /* |
1062 | * Handle a write reply that flushes a whole page. | |
1063 | * | |
1064 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
1065 | * writebacks since the page->count is kept > 1 for as long | |
1066 | * as the page has a write request pending. | |
1067 | */ | |
788e7a89 | 1068 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 1069 | { |
788e7a89 | 1070 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
1071 | struct nfs_page *req; |
1072 | struct page *page; | |
1073 | ||
788e7a89 TM |
1074 | if (nfs_writeback_done(task, data) != 0) |
1075 | return; | |
1076 | ||
1da177e4 LT |
1077 | /* Update attributes as result of writeback. */ |
1078 | while (!list_empty(&data->pages)) { | |
1079 | req = nfs_list_entry(data->pages.next); | |
1080 | nfs_list_remove_request(req); | |
1081 | page = req->wb_page; | |
1082 | ||
1083 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
1084 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1085 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1086 | req->wb_bytes, | |
1087 | (long long)req_offset(req)); | |
1088 | ||
788e7a89 | 1089 | if (task->tk_status < 0) { |
a301b777 | 1090 | nfs_set_pageerror(page); |
788e7a89 | 1091 | req->wb_context->error = task->tk_status; |
788e7a89 | 1092 | dprintk(", error = %d\n", task->tk_status); |
8e821cad | 1093 | goto remove_request; |
1da177e4 | 1094 | } |
1da177e4 | 1095 | |
8e821cad TM |
1096 | if (nfs_write_need_commit(data)) { |
1097 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1098 | nfs_mark_request_commit(req); | |
1099 | nfs_end_page_writeback(page); | |
1100 | dprintk(" marked for commit\n"); | |
1da177e4 LT |
1101 | goto next; |
1102 | } | |
8e821cad TM |
1103 | dprintk(" OK\n"); |
1104 | remove_request: | |
1105 | nfs_end_page_writeback(page); | |
1da177e4 | 1106 | nfs_inode_remove_request(req); |
1da177e4 | 1107 | next: |
c6a556b8 | 1108 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1109 | } |
1110 | } | |
1111 | ||
788e7a89 TM |
1112 | static const struct rpc_call_ops nfs_write_full_ops = { |
1113 | .rpc_call_done = nfs_writeback_done_full, | |
1114 | .rpc_release = nfs_writedata_release, | |
1115 | }; | |
1116 | ||
1117 | ||
1da177e4 LT |
1118 | /* |
1119 | * This function is called when the WRITE call is complete. | |
1120 | */ | |
462d5b32 | 1121 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1122 | { |
1da177e4 LT |
1123 | struct nfs_writeargs *argp = &data->args; |
1124 | struct nfs_writeres *resp = &data->res; | |
788e7a89 | 1125 | int status; |
1da177e4 | 1126 | |
a3f565b1 | 1127 | dprintk("NFS: %5u nfs_writeback_done (status %d)\n", |
1da177e4 LT |
1128 | task->tk_pid, task->tk_status); |
1129 | ||
f551e44f CL |
1130 | /* |
1131 | * ->write_done will attempt to use post-op attributes to detect | |
1132 | * conflicting writes by other clients. A strict interpretation | |
1133 | * of close-to-open would allow us to continue caching even if | |
1134 | * another writer had changed the file, but some applications | |
1135 | * depend on tighter cache coherency when writing. | |
1136 | */ | |
788e7a89 TM |
1137 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1138 | if (status != 0) | |
1139 | return status; | |
91d5b470 CL |
1140 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1141 | ||
1da177e4 LT |
1142 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1143 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1144 | /* We tried a write call, but the server did not | |
1145 | * commit data to stable storage even though we | |
1146 | * requested it. | |
1147 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1148 | * the server reports NFS_DATA_SYNC, but performs | |
1149 | * NFS_FILE_SYNC. We therefore implement this checking | |
1150 | * as a dprintk() in order to avoid filling syslog. | |
1151 | */ | |
1152 | static unsigned long complain; | |
1153 | ||
1154 | if (time_before(complain, jiffies)) { | |
1155 | dprintk("NFS: faulty NFS server %s:" | |
1156 | " (committed = %d) != (stable = %d)\n", | |
54ceac45 | 1157 | NFS_SERVER(data->inode)->nfs_client->cl_hostname, |
1da177e4 LT |
1158 | resp->verf->committed, argp->stable); |
1159 | complain = jiffies + 300 * HZ; | |
1160 | } | |
1161 | } | |
1162 | #endif | |
1163 | /* Is this a short write? */ | |
1164 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1165 | static unsigned long complain; | |
1166 | ||
91d5b470 CL |
1167 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1168 | ||
1da177e4 LT |
1169 | /* Has the server at least made some progress? */ |
1170 | if (resp->count != 0) { | |
1171 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1172 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1173 | /* Resend from where the server left off */ | |
1174 | argp->offset += resp->count; | |
1175 | argp->pgbase += resp->count; | |
1176 | argp->count -= resp->count; | |
1177 | } else { | |
1178 | /* Resend as a stable write in order to avoid | |
1179 | * headaches in the case of a server crash. | |
1180 | */ | |
1181 | argp->stable = NFS_FILE_SYNC; | |
1182 | } | |
1183 | rpc_restart_call(task); | |
788e7a89 | 1184 | return -EAGAIN; |
1da177e4 LT |
1185 | } |
1186 | if (time_before(complain, jiffies)) { | |
1187 | printk(KERN_WARNING | |
1188 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1189 | argp->count); | |
1190 | complain = jiffies + 300 * HZ; | |
1191 | } | |
1192 | /* Can't do anything about it except throw an error. */ | |
1193 | task->tk_status = -EIO; | |
1194 | } | |
788e7a89 | 1195 | return 0; |
1da177e4 LT |
1196 | } |
1197 | ||
1198 | ||
1199 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
963d8fe5 | 1200 | void nfs_commit_release(void *wdata) |
1da177e4 | 1201 | { |
1da177e4 LT |
1202 | nfs_commit_free(wdata); |
1203 | } | |
1204 | ||
1205 | /* | |
1206 | * Set up the argument/result storage required for the RPC call. | |
1207 | */ | |
1208 | static void nfs_commit_rpcsetup(struct list_head *head, | |
788e7a89 TM |
1209 | struct nfs_write_data *data, |
1210 | int how) | |
1da177e4 | 1211 | { |
3da28eb1 | 1212 | struct nfs_page *first; |
1da177e4 | 1213 | struct inode *inode; |
788e7a89 | 1214 | int flags; |
1da177e4 LT |
1215 | |
1216 | /* Set up the RPC argument and reply structs | |
1217 | * NB: take care not to mess about with data->commit et al. */ | |
1218 | ||
1219 | list_splice_init(head, &data->pages); | |
1220 | first = nfs_list_entry(data->pages.next); | |
1da177e4 LT |
1221 | inode = first->wb_context->dentry->d_inode; |
1222 | ||
1da177e4 LT |
1223 | data->inode = inode; |
1224 | data->cred = first->wb_context->cred; | |
1225 | ||
1226 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1227 | /* Note: we always request a commit of the entire inode */ |
1228 | data->args.offset = 0; | |
1229 | data->args.count = 0; | |
1230 | data->res.count = 0; | |
1da177e4 LT |
1231 | data->res.fattr = &data->fattr; |
1232 | data->res.verf = &data->verf; | |
0e574af1 | 1233 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1234 | |
1235 | /* Set up the initial task struct. */ | |
1236 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
1237 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data); | |
1da177e4 LT |
1238 | NFS_PROTO(inode)->commit_setup(data, how); |
1239 | ||
1240 | data->task.tk_priority = flush_task_priority(how); | |
1241 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 1242 | |
a3f565b1 | 1243 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); |
1da177e4 LT |
1244 | } |
1245 | ||
1246 | /* | |
1247 | * Commit dirty pages | |
1248 | */ | |
1249 | static int | |
40859d7e | 1250 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1251 | { |
1252 | struct nfs_write_data *data; | |
1253 | struct nfs_page *req; | |
1254 | ||
e9f7bee1 | 1255 | data = nfs_commit_alloc(); |
1da177e4 LT |
1256 | |
1257 | if (!data) | |
1258 | goto out_bad; | |
1259 | ||
1260 | /* Set up the argument struct */ | |
1261 | nfs_commit_rpcsetup(head, data, how); | |
1262 | ||
1263 | nfs_execute_write(data); | |
1264 | return 0; | |
1265 | out_bad: | |
1266 | while (!list_empty(head)) { | |
1267 | req = nfs_list_entry(head->next); | |
1268 | nfs_list_remove_request(req); | |
1269 | nfs_mark_request_commit(req); | |
83715ad5 | 1270 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
5c2d97cb | 1271 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1272 | } |
1273 | return -ENOMEM; | |
1274 | } | |
1275 | ||
1276 | /* | |
1277 | * COMMIT call returned | |
1278 | */ | |
788e7a89 | 1279 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1280 | { |
963d8fe5 | 1281 | struct nfs_write_data *data = calldata; |
1da177e4 | 1282 | struct nfs_page *req; |
1da177e4 | 1283 | |
a3f565b1 | 1284 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
1da177e4 LT |
1285 | task->tk_pid, task->tk_status); |
1286 | ||
788e7a89 TM |
1287 | /* Call the NFS version-specific code */ |
1288 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1289 | return; | |
1290 | ||
1da177e4 LT |
1291 | while (!list_empty(&data->pages)) { |
1292 | req = nfs_list_entry(data->pages.next); | |
1293 | nfs_list_remove_request(req); | |
612c9384 | 1294 | clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
fd39fc85 | 1295 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
1da177e4 LT |
1296 | |
1297 | dprintk("NFS: commit (%s/%Ld %d@%Ld)", | |
1298 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1299 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1300 | req->wb_bytes, | |
1301 | (long long)req_offset(req)); | |
1302 | if (task->tk_status < 0) { | |
1303 | req->wb_context->error = task->tk_status; | |
1304 | nfs_inode_remove_request(req); | |
1305 | dprintk(", error = %d\n", task->tk_status); | |
1306 | goto next; | |
1307 | } | |
1308 | ||
1309 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1310 | * returned by the server against all stored verfs. */ | |
1311 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1312 | /* We have a match */ | |
1313 | nfs_inode_remove_request(req); | |
1314 | dprintk(" OK\n"); | |
1315 | goto next; | |
1316 | } | |
1317 | /* We have a mismatch. Write the page again */ | |
1318 | dprintk(" mismatch\n"); | |
61822ab5 | 1319 | nfs_redirty_request(req); |
1da177e4 | 1320 | next: |
c6a556b8 | 1321 | nfs_clear_page_writeback(req); |
1da177e4 | 1322 | } |
1da177e4 | 1323 | } |
788e7a89 TM |
1324 | |
1325 | static const struct rpc_call_ops nfs_commit_ops = { | |
1326 | .rpc_call_done = nfs_commit_done, | |
1327 | .rpc_release = nfs_commit_release, | |
1328 | }; | |
c42de9dd TM |
1329 | #else |
1330 | static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) | |
1331 | { | |
1332 | return 0; | |
1333 | } | |
1da177e4 LT |
1334 | #endif |
1335 | ||
3f442547 | 1336 | static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1337 | { |
28c6925f | 1338 | struct nfs_inode *nfsi = NFS_I(mapping->host); |
1da177e4 | 1339 | LIST_HEAD(head); |
3f442547 | 1340 | long res; |
1da177e4 LT |
1341 | |
1342 | spin_lock(&nfsi->req_lock); | |
3f442547 | 1343 | res = nfs_scan_dirty(mapping, wbc, &head); |
1da177e4 | 1344 | spin_unlock(&nfsi->req_lock); |
ab0a3dbe | 1345 | if (res) { |
28c6925f | 1346 | int error = nfs_flush_list(mapping->host, &head, res, how); |
7d46a49f TM |
1347 | if (error < 0) |
1348 | return error; | |
ab0a3dbe | 1349 | } |
1da177e4 LT |
1350 | return res; |
1351 | } | |
1352 | ||
1353 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
3da28eb1 | 1354 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 LT |
1355 | { |
1356 | struct nfs_inode *nfsi = NFS_I(inode); | |
1357 | LIST_HEAD(head); | |
7d46a49f | 1358 | int res; |
1da177e4 LT |
1359 | |
1360 | spin_lock(&nfsi->req_lock); | |
3da28eb1 TM |
1361 | res = nfs_scan_commit(inode, &head, 0, 0); |
1362 | spin_unlock(&nfsi->req_lock); | |
1da177e4 | 1363 | if (res) { |
7d46a49f | 1364 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1365 | if (error < 0) |
1366 | return error; | |
1367 | } | |
1da177e4 LT |
1368 | return res; |
1369 | } | |
1370 | #endif | |
1371 | ||
1c75950b | 1372 | long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1373 | { |
1c75950b | 1374 | struct inode *inode = mapping->host; |
c42de9dd | 1375 | struct nfs_inode *nfsi = NFS_I(inode); |
1c75950b TM |
1376 | unsigned long idx_start, idx_end; |
1377 | unsigned int npages = 0; | |
c42de9dd | 1378 | LIST_HEAD(head); |
70b9ecbd | 1379 | int nocommit = how & FLUSH_NOCOMMIT; |
3f442547 | 1380 | long pages, ret; |
1da177e4 | 1381 | |
1c75950b TM |
1382 | /* FIXME */ |
1383 | if (wbc->range_cyclic) | |
1384 | idx_start = 0; | |
1385 | else { | |
1386 | idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1387 | idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1388 | if (idx_end > idx_start) { | |
1389 | unsigned long l_npages = 1 + idx_end - idx_start; | |
1390 | npages = l_npages; | |
1391 | if (sizeof(npages) != sizeof(l_npages) && | |
1392 | (unsigned long)npages != l_npages) | |
1393 | npages = 0; | |
1394 | } | |
1395 | } | |
c42de9dd TM |
1396 | how &= ~FLUSH_NOCOMMIT; |
1397 | spin_lock(&nfsi->req_lock); | |
1da177e4 | 1398 | do { |
1c75950b | 1399 | wbc->pages_skipped = 0; |
c42de9dd TM |
1400 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); |
1401 | if (ret != 0) | |
70b9ecbd | 1402 | continue; |
1c75950b | 1403 | pages = nfs_scan_dirty(mapping, wbc, &head); |
c42de9dd TM |
1404 | if (pages != 0) { |
1405 | spin_unlock(&nfsi->req_lock); | |
e8e058e8 | 1406 | if (how & FLUSH_INVALIDATE) { |
83715ad5 | 1407 | nfs_cancel_dirty_list(&head); |
e8e058e8 TM |
1408 | ret = pages; |
1409 | } else | |
d2ccddf0 | 1410 | ret = nfs_flush_list(inode, &head, pages, how); |
c42de9dd TM |
1411 | spin_lock(&nfsi->req_lock); |
1412 | continue; | |
1413 | } | |
1c75950b TM |
1414 | if (wbc->pages_skipped != 0) |
1415 | continue; | |
c42de9dd TM |
1416 | if (nocommit) |
1417 | break; | |
d2ccddf0 | 1418 | pages = nfs_scan_commit(inode, &head, idx_start, npages); |
1c75950b TM |
1419 | if (pages == 0) { |
1420 | if (wbc->pages_skipped != 0) | |
1421 | continue; | |
c42de9dd | 1422 | break; |
1c75950b | 1423 | } |
d2ccddf0 TM |
1424 | if (how & FLUSH_INVALIDATE) { |
1425 | spin_unlock(&nfsi->req_lock); | |
83715ad5 | 1426 | nfs_cancel_commit_list(&head); |
e8e058e8 | 1427 | ret = pages; |
d2ccddf0 TM |
1428 | spin_lock(&nfsi->req_lock); |
1429 | continue; | |
1430 | } | |
1431 | pages += nfs_scan_commit(inode, &head, 0, 0); | |
c42de9dd TM |
1432 | spin_unlock(&nfsi->req_lock); |
1433 | ret = nfs_commit_list(inode, &head, how); | |
1434 | spin_lock(&nfsi->req_lock); | |
1435 | } while (ret >= 0); | |
1436 | spin_unlock(&nfsi->req_lock); | |
1437 | return ret; | |
1da177e4 LT |
1438 | } |
1439 | ||
1c75950b TM |
1440 | /* |
1441 | * flush the inode to disk. | |
1442 | */ | |
1443 | int nfs_wb_all(struct inode *inode) | |
1444 | { | |
1445 | struct address_space *mapping = inode->i_mapping; | |
1446 | struct writeback_control wbc = { | |
1447 | .bdi = mapping->backing_dev_info, | |
1448 | .sync_mode = WB_SYNC_ALL, | |
1449 | .nr_to_write = LONG_MAX, | |
61822ab5 | 1450 | .for_writepages = 1, |
1c75950b TM |
1451 | .range_cyclic = 1, |
1452 | }; | |
1453 | int ret; | |
1454 | ||
61822ab5 TM |
1455 | ret = generic_writepages(mapping, &wbc); |
1456 | if (ret < 0) | |
1457 | goto out; | |
1c75950b TM |
1458 | ret = nfs_sync_mapping_wait(mapping, &wbc, 0); |
1459 | if (ret >= 0) | |
1460 | return 0; | |
61822ab5 | 1461 | out: |
e507d9eb | 1462 | __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); |
1c75950b TM |
1463 | return ret; |
1464 | } | |
1465 | ||
1466 | int nfs_sync_mapping_range(struct address_space *mapping, loff_t range_start, loff_t range_end, int how) | |
1467 | { | |
1468 | struct writeback_control wbc = { | |
1469 | .bdi = mapping->backing_dev_info, | |
1470 | .sync_mode = WB_SYNC_ALL, | |
1471 | .nr_to_write = LONG_MAX, | |
1472 | .range_start = range_start, | |
1473 | .range_end = range_end, | |
61822ab5 | 1474 | .for_writepages = 1, |
1c75950b TM |
1475 | }; |
1476 | int ret; | |
1477 | ||
61822ab5 TM |
1478 | if (!(how & FLUSH_NOWRITEPAGE)) { |
1479 | ret = generic_writepages(mapping, &wbc); | |
1480 | if (ret < 0) | |
1481 | goto out; | |
1482 | } | |
1c75950b TM |
1483 | ret = nfs_sync_mapping_wait(mapping, &wbc, how); |
1484 | if (ret >= 0) | |
1485 | return 0; | |
61822ab5 | 1486 | out: |
e507d9eb | 1487 | __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); |
1c75950b TM |
1488 | return ret; |
1489 | } | |
1490 | ||
61822ab5 | 1491 | int nfs_wb_page_priority(struct inode *inode, struct page *page, int how) |
1c75950b TM |
1492 | { |
1493 | loff_t range_start = page_offset(page); | |
1494 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
4d770ccf TM |
1495 | struct writeback_control wbc = { |
1496 | .bdi = page->mapping->backing_dev_info, | |
1497 | .sync_mode = WB_SYNC_ALL, | |
1498 | .nr_to_write = LONG_MAX, | |
1499 | .range_start = range_start, | |
1500 | .range_end = range_end, | |
1501 | }; | |
1502 | int ret; | |
1c75950b | 1503 | |
4d770ccf TM |
1504 | BUG_ON(!PageLocked(page)); |
1505 | if (!(how & FLUSH_NOWRITEPAGE) && clear_page_dirty_for_io(page)) { | |
1506 | ret = nfs_writepage_locked(page, &wbc); | |
1507 | if (ret < 0) | |
1508 | goto out; | |
1509 | } | |
f40313ac TM |
1510 | if (!PagePrivate(page)) |
1511 | return 0; | |
4d770ccf TM |
1512 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); |
1513 | if (ret >= 0) | |
1514 | return 0; | |
1515 | out: | |
e507d9eb | 1516 | __mark_inode_dirty(inode, I_DIRTY_PAGES); |
4d770ccf | 1517 | return ret; |
1c75950b TM |
1518 | } |
1519 | ||
1520 | /* | |
1521 | * Write back all requests on one page - we do this before reading it. | |
1522 | */ | |
1523 | int nfs_wb_page(struct inode *inode, struct page* page) | |
1524 | { | |
4d770ccf | 1525 | return nfs_wb_page_priority(inode, page, FLUSH_STABLE); |
1c75950b TM |
1526 | } |
1527 | ||
1a54533e TM |
1528 | int nfs_set_page_dirty(struct page *page) |
1529 | { | |
1530 | struct nfs_page *req; | |
1531 | ||
1532 | req = nfs_page_find_request(page); | |
1533 | if (req != NULL) { | |
1534 | /* Mark any existing write requests for flushing */ | |
1535 | set_bit(PG_NEED_FLUSH, &req->wb_flags); | |
1536 | nfs_release_request(req); | |
1537 | } | |
1538 | return __set_page_dirty_nobuffers(page); | |
1539 | } | |
1540 | ||
1c75950b | 1541 | |
f7b422b1 | 1542 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1543 | { |
1544 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1545 | sizeof(struct nfs_write_data), | |
1546 | 0, SLAB_HWCACHE_ALIGN, | |
1547 | NULL, NULL); | |
1548 | if (nfs_wdata_cachep == NULL) | |
1549 | return -ENOMEM; | |
1550 | ||
93d2341c MD |
1551 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1552 | nfs_wdata_cachep); | |
1da177e4 LT |
1553 | if (nfs_wdata_mempool == NULL) |
1554 | return -ENOMEM; | |
1555 | ||
93d2341c MD |
1556 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1557 | nfs_wdata_cachep); | |
1da177e4 LT |
1558 | if (nfs_commit_mempool == NULL) |
1559 | return -ENOMEM; | |
1560 | ||
89a09141 PZ |
1561 | /* |
1562 | * NFS congestion size, scale with available memory. | |
1563 | * | |
1564 | * 64MB: 8192k | |
1565 | * 128MB: 11585k | |
1566 | * 256MB: 16384k | |
1567 | * 512MB: 23170k | |
1568 | * 1GB: 32768k | |
1569 | * 2GB: 46340k | |
1570 | * 4GB: 65536k | |
1571 | * 8GB: 92681k | |
1572 | * 16GB: 131072k | |
1573 | * | |
1574 | * This allows larger machines to have larger/more transfers. | |
1575 | * Limit the default to 256M | |
1576 | */ | |
1577 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); | |
1578 | if (nfs_congestion_kb > 256*1024) | |
1579 | nfs_congestion_kb = 256*1024; | |
1580 | ||
1da177e4 LT |
1581 | return 0; |
1582 | } | |
1583 | ||
266bee88 | 1584 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1585 | { |
1586 | mempool_destroy(nfs_commit_mempool); | |
1587 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1588 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1589 | } |
1590 |