Commit | Line | Data |
---|---|---|
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); |
2b82f190 TM |
391 | if (PageDirty(req->wb_page)) |
392 | set_bit(PG_NEED_FLUSH, &req->wb_flags); | |
1da177e4 LT |
393 | nfsi->npages++; |
394 | atomic_inc(&req->wb_count); | |
395 | return 0; | |
396 | } | |
397 | ||
398 | /* | |
89a09141 | 399 | * Remove a write request from an inode |
1da177e4 LT |
400 | */ |
401 | static void nfs_inode_remove_request(struct nfs_page *req) | |
402 | { | |
403 | struct inode *inode = req->wb_context->dentry->d_inode; | |
404 | struct nfs_inode *nfsi = NFS_I(inode); | |
405 | ||
406 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
407 | ||
408 | spin_lock(&nfsi->req_lock); | |
277459d2 | 409 | set_page_private(req->wb_page, 0); |
deb7d638 | 410 | ClearPagePrivate(req->wb_page); |
1da177e4 | 411 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
2b82f190 TM |
412 | if (test_and_clear_bit(PG_NEED_FLUSH, &req->wb_flags)) |
413 | __set_page_dirty_nobuffers(req->wb_page); | |
1da177e4 LT |
414 | nfsi->npages--; |
415 | if (!nfsi->npages) { | |
416 | spin_unlock(&nfsi->req_lock); | |
951a143b | 417 | nfs_end_data_update(inode); |
1da177e4 LT |
418 | iput(inode); |
419 | } else | |
420 | spin_unlock(&nfsi->req_lock); | |
421 | nfs_clear_request(req); | |
422 | nfs_release_request(req); | |
423 | } | |
424 | ||
61822ab5 TM |
425 | static void |
426 | nfs_redirty_request(struct nfs_page *req) | |
427 | { | |
61822ab5 TM |
428 | __set_page_dirty_nobuffers(req->wb_page); |
429 | } | |
430 | ||
1da177e4 LT |
431 | /* |
432 | * Check if a request is dirty | |
433 | */ | |
434 | static inline int | |
435 | nfs_dirty_request(struct nfs_page *req) | |
436 | { | |
5a6d41b3 TM |
437 | struct page *page = req->wb_page; |
438 | ||
612c9384 | 439 | if (page == NULL || test_bit(PG_NEED_COMMIT, &req->wb_flags)) |
5a6d41b3 TM |
440 | return 0; |
441 | return !PageWriteback(req->wb_page); | |
1da177e4 LT |
442 | } |
443 | ||
444 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
445 | /* | |
446 | * Add a request to the inode's commit list. | |
447 | */ | |
448 | static void | |
449 | nfs_mark_request_commit(struct nfs_page *req) | |
450 | { | |
451 | struct inode *inode = req->wb_context->dentry->d_inode; | |
452 | struct nfs_inode *nfsi = NFS_I(inode); | |
453 | ||
454 | spin_lock(&nfsi->req_lock); | |
455 | nfs_list_add_request(req, &nfsi->commit); | |
456 | nfsi->ncommit++; | |
612c9384 | 457 | set_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
1da177e4 | 458 | spin_unlock(&nfsi->req_lock); |
fd39fc85 | 459 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
a1803044 | 460 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1da177e4 | 461 | } |
8e821cad TM |
462 | |
463 | static inline | |
464 | int nfs_write_need_commit(struct nfs_write_data *data) | |
465 | { | |
466 | return data->verf.committed != NFS_FILE_SYNC; | |
467 | } | |
468 | ||
469 | static inline | |
470 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
471 | { | |
612c9384 | 472 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
8e821cad TM |
473 | nfs_mark_request_commit(req); |
474 | return 1; | |
475 | } | |
476 | if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { | |
477 | nfs_redirty_request(req); | |
478 | return 1; | |
479 | } | |
480 | return 0; | |
481 | } | |
482 | #else | |
483 | static inline void | |
484 | nfs_mark_request_commit(struct nfs_page *req) | |
485 | { | |
486 | } | |
487 | ||
488 | static inline | |
489 | int nfs_write_need_commit(struct nfs_write_data *data) | |
490 | { | |
491 | return 0; | |
492 | } | |
493 | ||
494 | static inline | |
495 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
496 | { | |
497 | return 0; | |
498 | } | |
1da177e4 LT |
499 | #endif |
500 | ||
501 | /* | |
502 | * Wait for a request to complete. | |
503 | * | |
504 | * Interruptible by signals only if mounted with intr flag. | |
505 | */ | |
c42de9dd | 506 | static int nfs_wait_on_requests_locked(struct inode *inode, unsigned long idx_start, unsigned int npages) |
1da177e4 LT |
507 | { |
508 | struct nfs_inode *nfsi = NFS_I(inode); | |
509 | struct nfs_page *req; | |
510 | unsigned long idx_end, next; | |
511 | unsigned int res = 0; | |
512 | int error; | |
513 | ||
514 | if (npages == 0) | |
515 | idx_end = ~0; | |
516 | else | |
517 | idx_end = idx_start + npages - 1; | |
518 | ||
1da177e4 | 519 | next = idx_start; |
c6a556b8 | 520 | while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_WRITEBACK)) { |
1da177e4 LT |
521 | if (req->wb_index > idx_end) |
522 | break; | |
523 | ||
524 | next = req->wb_index + 1; | |
c6a556b8 | 525 | BUG_ON(!NFS_WBACK_BUSY(req)); |
1da177e4 LT |
526 | |
527 | atomic_inc(&req->wb_count); | |
528 | spin_unlock(&nfsi->req_lock); | |
529 | error = nfs_wait_on_request(req); | |
530 | nfs_release_request(req); | |
c42de9dd | 531 | spin_lock(&nfsi->req_lock); |
1da177e4 LT |
532 | if (error < 0) |
533 | return error; | |
1da177e4 LT |
534 | res++; |
535 | } | |
1da177e4 LT |
536 | return res; |
537 | } | |
538 | ||
83715ad5 | 539 | static void nfs_cancel_dirty_list(struct list_head *head) |
d2ccddf0 TM |
540 | { |
541 | struct nfs_page *req; | |
542 | while(!list_empty(head)) { | |
543 | req = nfs_list_entry(head->next); | |
544 | nfs_list_remove_request(req); | |
5a6d41b3 | 545 | nfs_end_page_writeback(req->wb_page); |
d2ccddf0 TM |
546 | nfs_inode_remove_request(req); |
547 | nfs_clear_page_writeback(req); | |
548 | } | |
549 | } | |
550 | ||
83715ad5 TM |
551 | static void nfs_cancel_commit_list(struct list_head *head) |
552 | { | |
553 | struct nfs_page *req; | |
554 | ||
555 | while(!list_empty(head)) { | |
556 | req = nfs_list_entry(head->next); | |
b6dff26a | 557 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
83715ad5 | 558 | nfs_list_remove_request(req); |
612c9384 | 559 | clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
83715ad5 | 560 | nfs_inode_remove_request(req); |
b6dff26a | 561 | nfs_unlock_request(req); |
83715ad5 TM |
562 | } |
563 | } | |
564 | ||
1da177e4 LT |
565 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
566 | /* | |
567 | * nfs_scan_commit - Scan an inode for commit requests | |
568 | * @inode: NFS inode to scan | |
569 | * @dst: destination list | |
570 | * @idx_start: lower bound of page->index to scan. | |
571 | * @npages: idx_start + npages sets the upper bound to scan. | |
572 | * | |
573 | * Moves requests from the inode's 'commit' request list. | |
574 | * The requests are *not* checked to ensure that they form a contiguous set. | |
575 | */ | |
576 | static int | |
577 | nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
578 | { | |
579 | struct nfs_inode *nfsi = NFS_I(inode); | |
3da28eb1 TM |
580 | int res = 0; |
581 | ||
582 | if (nfsi->ncommit != 0) { | |
d2ccddf0 | 583 | res = nfs_scan_list(nfsi, &nfsi->commit, dst, idx_start, npages); |
3da28eb1 TM |
584 | nfsi->ncommit -= res; |
585 | if ((nfsi->ncommit == 0) != list_empty(&nfsi->commit)) | |
586 | printk(KERN_ERR "NFS: desynchronized value of nfs_i.ncommit.\n"); | |
587 | } | |
1da177e4 LT |
588 | return res; |
589 | } | |
c42de9dd TM |
590 | #else |
591 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
592 | { | |
593 | return 0; | |
594 | } | |
1da177e4 LT |
595 | #endif |
596 | ||
1da177e4 LT |
597 | /* |
598 | * Try to update any existing write request, or create one if there is none. | |
599 | * In order to match, the request's credentials must match those of | |
600 | * the calling process. | |
601 | * | |
602 | * Note: Should always be called with the Page Lock held! | |
603 | */ | |
604 | static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, | |
e21195a7 | 605 | struct page *page, unsigned int offset, unsigned int bytes) |
1da177e4 | 606 | { |
89a09141 PZ |
607 | struct address_space *mapping = page->mapping; |
608 | struct inode *inode = mapping->host; | |
1da177e4 LT |
609 | struct nfs_inode *nfsi = NFS_I(inode); |
610 | struct nfs_page *req, *new = NULL; | |
611 | unsigned long rqend, end; | |
612 | ||
613 | end = offset + bytes; | |
614 | ||
1da177e4 LT |
615 | for (;;) { |
616 | /* Loop over all inode entries and see if we find | |
617 | * A request for the page we wish to update | |
618 | */ | |
619 | spin_lock(&nfsi->req_lock); | |
277459d2 | 620 | req = nfs_page_find_request_locked(page); |
1da177e4 LT |
621 | if (req) { |
622 | if (!nfs_lock_request_dontget(req)) { | |
623 | int error; | |
277459d2 | 624 | |
1da177e4 LT |
625 | spin_unlock(&nfsi->req_lock); |
626 | error = nfs_wait_on_request(req); | |
627 | nfs_release_request(req); | |
1dd594b2 NB |
628 | if (error < 0) { |
629 | if (new) | |
630 | nfs_release_request(new); | |
1da177e4 | 631 | return ERR_PTR(error); |
1dd594b2 | 632 | } |
1da177e4 LT |
633 | continue; |
634 | } | |
635 | spin_unlock(&nfsi->req_lock); | |
636 | if (new) | |
637 | nfs_release_request(new); | |
638 | break; | |
639 | } | |
640 | ||
641 | if (new) { | |
642 | int error; | |
643 | nfs_lock_request_dontget(new); | |
644 | error = nfs_inode_add_request(inode, new); | |
645 | if (error) { | |
646 | spin_unlock(&nfsi->req_lock); | |
647 | nfs_unlock_request(new); | |
648 | return ERR_PTR(error); | |
649 | } | |
650 | spin_unlock(&nfsi->req_lock); | |
1da177e4 LT |
651 | return new; |
652 | } | |
653 | spin_unlock(&nfsi->req_lock); | |
654 | ||
655 | new = nfs_create_request(ctx, inode, page, offset, bytes); | |
656 | if (IS_ERR(new)) | |
657 | return new; | |
658 | } | |
659 | ||
660 | /* We have a request for our page. | |
661 | * If the creds don't match, or the | |
662 | * page addresses don't match, | |
663 | * tell the caller to wait on the conflicting | |
664 | * request. | |
665 | */ | |
666 | rqend = req->wb_offset + req->wb_bytes; | |
667 | if (req->wb_context != ctx | |
668 | || req->wb_page != page | |
669 | || !nfs_dirty_request(req) | |
670 | || offset > rqend || end < req->wb_offset) { | |
671 | nfs_unlock_request(req); | |
672 | return ERR_PTR(-EBUSY); | |
673 | } | |
674 | ||
675 | /* Okay, the request matches. Update the region */ | |
676 | if (offset < req->wb_offset) { | |
677 | req->wb_offset = offset; | |
678 | req->wb_pgbase = offset; | |
679 | req->wb_bytes = rqend - req->wb_offset; | |
680 | } | |
681 | ||
682 | if (end > rqend) | |
683 | req->wb_bytes = end - req->wb_offset; | |
684 | ||
685 | return req; | |
686 | } | |
687 | ||
688 | int nfs_flush_incompatible(struct file *file, struct page *page) | |
689 | { | |
690 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 | 691 | struct nfs_page *req; |
1a54533e | 692 | int do_flush, status; |
1da177e4 LT |
693 | /* |
694 | * Look for a request corresponding to this page. If there | |
695 | * is one, and it belongs to another file, we flush it out | |
696 | * before we try to copy anything into the page. Do this | |
697 | * due to the lack of an ACCESS-type call in NFSv2. | |
698 | * Also do the same if we find a request from an existing | |
699 | * dropped page. | |
700 | */ | |
1a54533e TM |
701 | do { |
702 | req = nfs_page_find_request(page); | |
703 | if (req == NULL) | |
704 | return 0; | |
705 | do_flush = req->wb_page != page || req->wb_context != ctx | |
e261f51f | 706 | || !nfs_dirty_request(req); |
1da177e4 | 707 | nfs_release_request(req); |
1a54533e TM |
708 | if (!do_flush) |
709 | return 0; | |
710 | status = nfs_wb_page(page->mapping->host, page); | |
711 | } while (status == 0); | |
712 | return status; | |
1da177e4 LT |
713 | } |
714 | ||
715 | /* | |
716 | * Update and possibly write a cached page of an NFS file. | |
717 | * | |
718 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
719 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
720 | */ | |
721 | int nfs_updatepage(struct file *file, struct page *page, | |
722 | unsigned int offset, unsigned int count) | |
723 | { | |
724 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 | 725 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
726 | int status = 0; |
727 | ||
91d5b470 CL |
728 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
729 | ||
1da177e4 | 730 | dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", |
01cce933 JJS |
731 | file->f_path.dentry->d_parent->d_name.name, |
732 | file->f_path.dentry->d_name.name, count, | |
0bbacc40 | 733 | (long long)(page_offset(page) +offset)); |
1da177e4 | 734 | |
1da177e4 LT |
735 | /* If we're not using byte range locks, and we know the page |
736 | * is entirely in cache, it may be more efficient to avoid | |
737 | * fragmenting write requests. | |
738 | */ | |
ab0a3dbe | 739 | if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) { |
49a70f27 | 740 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 741 | offset = 0; |
1da177e4 LT |
742 | } |
743 | ||
e21195a7 | 744 | status = nfs_writepage_setup(ctx, page, offset, count); |
e261f51f | 745 | __set_page_dirty_nobuffers(page); |
1da177e4 | 746 | |
1da177e4 LT |
747 | dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", |
748 | status, (long long)i_size_read(inode)); | |
749 | if (status < 0) | |
a301b777 | 750 | nfs_set_pageerror(page); |
1da177e4 LT |
751 | return status; |
752 | } | |
753 | ||
754 | static void nfs_writepage_release(struct nfs_page *req) | |
755 | { | |
1da177e4 | 756 | |
8e821cad TM |
757 | if (PageError(req->wb_page) || !nfs_reschedule_unstable_write(req)) { |
758 | nfs_end_page_writeback(req->wb_page); | |
759 | nfs_inode_remove_request(req); | |
760 | } else | |
761 | nfs_end_page_writeback(req->wb_page); | |
c6a556b8 | 762 | nfs_clear_page_writeback(req); |
1da177e4 LT |
763 | } |
764 | ||
765 | static inline int flush_task_priority(int how) | |
766 | { | |
767 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
768 | case FLUSH_HIGHPRI: | |
769 | return RPC_PRIORITY_HIGH; | |
770 | case FLUSH_LOWPRI: | |
771 | return RPC_PRIORITY_LOW; | |
772 | } | |
773 | return RPC_PRIORITY_NORMAL; | |
774 | } | |
775 | ||
776 | /* | |
777 | * Set up the argument/result storage required for the RPC call. | |
778 | */ | |
779 | static void nfs_write_rpcsetup(struct nfs_page *req, | |
780 | struct nfs_write_data *data, | |
788e7a89 | 781 | const struct rpc_call_ops *call_ops, |
1da177e4 LT |
782 | unsigned int count, unsigned int offset, |
783 | int how) | |
784 | { | |
1da177e4 | 785 | struct inode *inode; |
788e7a89 | 786 | int flags; |
1da177e4 LT |
787 | |
788 | /* Set up the RPC argument and reply structs | |
789 | * NB: take care not to mess about with data->commit et al. */ | |
790 | ||
791 | data->req = req; | |
792 | data->inode = inode = req->wb_context->dentry->d_inode; | |
793 | data->cred = req->wb_context->cred; | |
794 | ||
795 | data->args.fh = NFS_FH(inode); | |
796 | data->args.offset = req_offset(req) + offset; | |
797 | data->args.pgbase = req->wb_pgbase + offset; | |
798 | data->args.pages = data->pagevec; | |
799 | data->args.count = count; | |
800 | data->args.context = req->wb_context; | |
801 | ||
802 | data->res.fattr = &data->fattr; | |
803 | data->res.count = count; | |
804 | data->res.verf = &data->verf; | |
0e574af1 | 805 | nfs_fattr_init(&data->fattr); |
1da177e4 | 806 | |
788e7a89 TM |
807 | /* Set up the initial task struct. */ |
808 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
809 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data); | |
1da177e4 LT |
810 | NFS_PROTO(inode)->write_setup(data, how); |
811 | ||
812 | data->task.tk_priority = flush_task_priority(how); | |
813 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 814 | |
a3f565b1 CL |
815 | dprintk("NFS: %5u initiated write call " |
816 | "(req %s/%Ld, %u bytes @ offset %Lu)\n", | |
0bbacc40 | 817 | data->task.tk_pid, |
1da177e4 LT |
818 | inode->i_sb->s_id, |
819 | (long long)NFS_FILEID(inode), | |
820 | count, | |
821 | (unsigned long long)data->args.offset); | |
822 | } | |
823 | ||
824 | static void nfs_execute_write(struct nfs_write_data *data) | |
825 | { | |
826 | struct rpc_clnt *clnt = NFS_CLIENT(data->inode); | |
827 | sigset_t oldset; | |
828 | ||
829 | rpc_clnt_sigmask(clnt, &oldset); | |
1da177e4 | 830 | rpc_execute(&data->task); |
1da177e4 LT |
831 | rpc_clnt_sigunmask(clnt, &oldset); |
832 | } | |
833 | ||
834 | /* | |
835 | * Generate multiple small requests to write out a single | |
836 | * contiguous dirty area on one page. | |
837 | */ | |
bcb71bba | 838 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, size_t count, int how) |
1da177e4 LT |
839 | { |
840 | struct nfs_page *req = nfs_list_entry(head->next); | |
841 | struct page *page = req->wb_page; | |
842 | struct nfs_write_data *data; | |
e9f7bee1 TM |
843 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
844 | unsigned int offset; | |
1da177e4 LT |
845 | int requests = 0; |
846 | LIST_HEAD(list); | |
847 | ||
848 | nfs_list_remove_request(req); | |
849 | ||
bcb71bba | 850 | nbytes = count; |
e9f7bee1 TM |
851 | do { |
852 | size_t len = min(nbytes, wsize); | |
853 | ||
854 | data = nfs_writedata_alloc(len); | |
1da177e4 LT |
855 | if (!data) |
856 | goto out_bad; | |
857 | list_add(&data->pages, &list); | |
858 | requests++; | |
e9f7bee1 TM |
859 | nbytes -= len; |
860 | } while (nbytes != 0); | |
1da177e4 LT |
861 | atomic_set(&req->wb_complete, requests); |
862 | ||
863 | ClearPageError(page); | |
1da177e4 | 864 | offset = 0; |
bcb71bba | 865 | nbytes = count; |
1da177e4 LT |
866 | do { |
867 | data = list_entry(list.next, struct nfs_write_data, pages); | |
868 | list_del_init(&data->pages); | |
869 | ||
870 | data->pagevec[0] = page; | |
1da177e4 | 871 | |
bcb71bba TM |
872 | if (nbytes < wsize) |
873 | wsize = nbytes; | |
874 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, | |
875 | wsize, offset, how); | |
876 | offset += wsize; | |
877 | nbytes -= wsize; | |
1da177e4 LT |
878 | nfs_execute_write(data); |
879 | } while (nbytes != 0); | |
880 | ||
881 | return 0; | |
882 | ||
883 | out_bad: | |
884 | while (!list_empty(&list)) { | |
885 | data = list_entry(list.next, struct nfs_write_data, pages); | |
886 | list_del(&data->pages); | |
8aca67f0 | 887 | nfs_writedata_release(data); |
1da177e4 | 888 | } |
61822ab5 | 889 | nfs_redirty_request(req); |
6d677e35 | 890 | nfs_end_page_writeback(req->wb_page); |
c6a556b8 | 891 | nfs_clear_page_writeback(req); |
1da177e4 LT |
892 | return -ENOMEM; |
893 | } | |
894 | ||
895 | /* | |
896 | * Create an RPC task for the given write request and kick it. | |
897 | * The page must have been locked by the caller. | |
898 | * | |
899 | * It may happen that the page we're passed is not marked dirty. | |
900 | * This is the case if nfs_updatepage detects a conflicting request | |
901 | * that has been written but not committed. | |
902 | */ | |
bcb71bba | 903 | static int nfs_flush_one(struct inode *inode, struct list_head *head, size_t count, int how) |
1da177e4 LT |
904 | { |
905 | struct nfs_page *req; | |
906 | struct page **pages; | |
907 | struct nfs_write_data *data; | |
1da177e4 | 908 | |
bcb71bba | 909 | data = nfs_writedata_alloc(count); |
1da177e4 LT |
910 | if (!data) |
911 | goto out_bad; | |
912 | ||
913 | pages = data->pagevec; | |
1da177e4 LT |
914 | while (!list_empty(head)) { |
915 | req = nfs_list_entry(head->next); | |
916 | nfs_list_remove_request(req); | |
917 | nfs_list_add_request(req, &data->pages); | |
918 | ClearPageError(req->wb_page); | |
1da177e4 | 919 | *pages++ = req->wb_page; |
1da177e4 LT |
920 | } |
921 | req = nfs_list_entry(data->pages.next); | |
922 | ||
1da177e4 | 923 | /* Set up the argument struct */ |
788e7a89 | 924 | nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 LT |
925 | |
926 | nfs_execute_write(data); | |
927 | return 0; | |
928 | out_bad: | |
929 | while (!list_empty(head)) { | |
930 | struct nfs_page *req = nfs_list_entry(head->next); | |
931 | nfs_list_remove_request(req); | |
61822ab5 | 932 | nfs_redirty_request(req); |
6d677e35 | 933 | nfs_end_page_writeback(req->wb_page); |
c6a556b8 | 934 | nfs_clear_page_writeback(req); |
1da177e4 LT |
935 | } |
936 | return -ENOMEM; | |
937 | } | |
938 | ||
7d46a49f | 939 | static int nfs_flush_list(struct inode *inode, struct list_head *head, int npages, int how) |
1da177e4 | 940 | { |
d8a5ad75 | 941 | struct nfs_pageio_descriptor desc; |
7d46a49f TM |
942 | int wpages = NFS_SERVER(inode)->wpages; |
943 | int wsize = NFS_SERVER(inode)->wsize; | |
1da177e4 | 944 | |
7d46a49f TM |
945 | /* For single writes, FLUSH_STABLE is more efficient */ |
946 | if (npages <= wpages && npages == NFS_I(inode)->npages | |
947 | && nfs_list_entry(head->next)->wb_bytes <= wsize) | |
948 | how |= FLUSH_STABLE; | |
949 | ||
bcb71bba TM |
950 | if (wsize < PAGE_CACHE_SIZE) |
951 | nfs_pageio_init(&desc, inode, nfs_flush_multi, wsize, how); | |
952 | else | |
953 | nfs_pageio_init(&desc, inode, nfs_flush_one, wsize, how); | |
954 | nfs_pageio_add_list(&desc, head); | |
955 | nfs_pageio_complete(&desc); | |
956 | if (desc.pg_error == 0) | |
957 | return 0; | |
1da177e4 | 958 | while (!list_empty(head)) { |
d8a5ad75 | 959 | struct nfs_page *req = nfs_list_entry(head->next); |
1da177e4 | 960 | nfs_list_remove_request(req); |
61822ab5 | 961 | nfs_redirty_request(req); |
6d677e35 | 962 | nfs_end_page_writeback(req->wb_page); |
c6a556b8 | 963 | nfs_clear_page_writeback(req); |
1da177e4 | 964 | } |
bcb71bba | 965 | return desc.pg_error; |
1da177e4 LT |
966 | } |
967 | ||
968 | /* | |
969 | * Handle a write reply that flushed part of a page. | |
970 | */ | |
788e7a89 | 971 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 972 | { |
788e7a89 | 973 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
974 | struct nfs_page *req = data->req; |
975 | struct page *page = req->wb_page; | |
976 | ||
977 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
978 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
979 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
980 | req->wb_bytes, | |
981 | (long long)req_offset(req)); | |
982 | ||
788e7a89 TM |
983 | if (nfs_writeback_done(task, data) != 0) |
984 | return; | |
985 | ||
986 | if (task->tk_status < 0) { | |
a301b777 | 987 | nfs_set_pageerror(page); |
788e7a89 TM |
988 | req->wb_context->error = task->tk_status; |
989 | dprintk(", error = %d\n", task->tk_status); | |
8e821cad | 990 | goto out; |
1da177e4 LT |
991 | } |
992 | ||
8e821cad TM |
993 | if (nfs_write_need_commit(data)) { |
994 | spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock; | |
995 | ||
996 | spin_lock(req_lock); | |
997 | if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { | |
998 | /* Do nothing we need to resend the writes */ | |
999 | } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
1000 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1001 | dprintk(" defer commit\n"); | |
1002 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
1003 | set_bit(PG_NEED_RESCHED, &req->wb_flags); | |
1004 | clear_bit(PG_NEED_COMMIT, &req->wb_flags); | |
1005 | dprintk(" server reboot detected\n"); | |
1006 | } | |
1007 | spin_unlock(req_lock); | |
1008 | } else | |
1009 | dprintk(" OK\n"); | |
1010 | ||
1011 | out: | |
1da177e4 LT |
1012 | if (atomic_dec_and_test(&req->wb_complete)) |
1013 | nfs_writepage_release(req); | |
1014 | } | |
1015 | ||
788e7a89 TM |
1016 | static const struct rpc_call_ops nfs_write_partial_ops = { |
1017 | .rpc_call_done = nfs_writeback_done_partial, | |
1018 | .rpc_release = nfs_writedata_release, | |
1019 | }; | |
1020 | ||
1da177e4 LT |
1021 | /* |
1022 | * Handle a write reply that flushes a whole page. | |
1023 | * | |
1024 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
1025 | * writebacks since the page->count is kept > 1 for as long | |
1026 | * as the page has a write request pending. | |
1027 | */ | |
788e7a89 | 1028 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 1029 | { |
788e7a89 | 1030 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
1031 | struct nfs_page *req; |
1032 | struct page *page; | |
1033 | ||
788e7a89 TM |
1034 | if (nfs_writeback_done(task, data) != 0) |
1035 | return; | |
1036 | ||
1da177e4 LT |
1037 | /* Update attributes as result of writeback. */ |
1038 | while (!list_empty(&data->pages)) { | |
1039 | req = nfs_list_entry(data->pages.next); | |
1040 | nfs_list_remove_request(req); | |
1041 | page = req->wb_page; | |
1042 | ||
1043 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
1044 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1045 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1046 | req->wb_bytes, | |
1047 | (long long)req_offset(req)); | |
1048 | ||
788e7a89 | 1049 | if (task->tk_status < 0) { |
a301b777 | 1050 | nfs_set_pageerror(page); |
788e7a89 | 1051 | req->wb_context->error = task->tk_status; |
788e7a89 | 1052 | dprintk(", error = %d\n", task->tk_status); |
8e821cad | 1053 | goto remove_request; |
1da177e4 | 1054 | } |
1da177e4 | 1055 | |
8e821cad TM |
1056 | if (nfs_write_need_commit(data)) { |
1057 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1058 | nfs_mark_request_commit(req); | |
1059 | nfs_end_page_writeback(page); | |
1060 | dprintk(" marked for commit\n"); | |
1da177e4 LT |
1061 | goto next; |
1062 | } | |
8e821cad TM |
1063 | dprintk(" OK\n"); |
1064 | remove_request: | |
1065 | nfs_end_page_writeback(page); | |
1da177e4 | 1066 | nfs_inode_remove_request(req); |
1da177e4 | 1067 | next: |
c6a556b8 | 1068 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1069 | } |
1070 | } | |
1071 | ||
788e7a89 TM |
1072 | static const struct rpc_call_ops nfs_write_full_ops = { |
1073 | .rpc_call_done = nfs_writeback_done_full, | |
1074 | .rpc_release = nfs_writedata_release, | |
1075 | }; | |
1076 | ||
1077 | ||
1da177e4 LT |
1078 | /* |
1079 | * This function is called when the WRITE call is complete. | |
1080 | */ | |
462d5b32 | 1081 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1082 | { |
1da177e4 LT |
1083 | struct nfs_writeargs *argp = &data->args; |
1084 | struct nfs_writeres *resp = &data->res; | |
788e7a89 | 1085 | int status; |
1da177e4 | 1086 | |
a3f565b1 | 1087 | dprintk("NFS: %5u nfs_writeback_done (status %d)\n", |
1da177e4 LT |
1088 | task->tk_pid, task->tk_status); |
1089 | ||
f551e44f CL |
1090 | /* |
1091 | * ->write_done will attempt to use post-op attributes to detect | |
1092 | * conflicting writes by other clients. A strict interpretation | |
1093 | * of close-to-open would allow us to continue caching even if | |
1094 | * another writer had changed the file, but some applications | |
1095 | * depend on tighter cache coherency when writing. | |
1096 | */ | |
788e7a89 TM |
1097 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1098 | if (status != 0) | |
1099 | return status; | |
91d5b470 CL |
1100 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1101 | ||
1da177e4 LT |
1102 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1103 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1104 | /* We tried a write call, but the server did not | |
1105 | * commit data to stable storage even though we | |
1106 | * requested it. | |
1107 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1108 | * the server reports NFS_DATA_SYNC, but performs | |
1109 | * NFS_FILE_SYNC. We therefore implement this checking | |
1110 | * as a dprintk() in order to avoid filling syslog. | |
1111 | */ | |
1112 | static unsigned long complain; | |
1113 | ||
1114 | if (time_before(complain, jiffies)) { | |
1115 | dprintk("NFS: faulty NFS server %s:" | |
1116 | " (committed = %d) != (stable = %d)\n", | |
54ceac45 | 1117 | NFS_SERVER(data->inode)->nfs_client->cl_hostname, |
1da177e4 LT |
1118 | resp->verf->committed, argp->stable); |
1119 | complain = jiffies + 300 * HZ; | |
1120 | } | |
1121 | } | |
1122 | #endif | |
1123 | /* Is this a short write? */ | |
1124 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1125 | static unsigned long complain; | |
1126 | ||
91d5b470 CL |
1127 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1128 | ||
1da177e4 LT |
1129 | /* Has the server at least made some progress? */ |
1130 | if (resp->count != 0) { | |
1131 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1132 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1133 | /* Resend from where the server left off */ | |
1134 | argp->offset += resp->count; | |
1135 | argp->pgbase += resp->count; | |
1136 | argp->count -= resp->count; | |
1137 | } else { | |
1138 | /* Resend as a stable write in order to avoid | |
1139 | * headaches in the case of a server crash. | |
1140 | */ | |
1141 | argp->stable = NFS_FILE_SYNC; | |
1142 | } | |
1143 | rpc_restart_call(task); | |
788e7a89 | 1144 | return -EAGAIN; |
1da177e4 LT |
1145 | } |
1146 | if (time_before(complain, jiffies)) { | |
1147 | printk(KERN_WARNING | |
1148 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1149 | argp->count); | |
1150 | complain = jiffies + 300 * HZ; | |
1151 | } | |
1152 | /* Can't do anything about it except throw an error. */ | |
1153 | task->tk_status = -EIO; | |
1154 | } | |
788e7a89 | 1155 | return 0; |
1da177e4 LT |
1156 | } |
1157 | ||
1158 | ||
1159 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
963d8fe5 | 1160 | void nfs_commit_release(void *wdata) |
1da177e4 | 1161 | { |
1da177e4 LT |
1162 | nfs_commit_free(wdata); |
1163 | } | |
1164 | ||
1165 | /* | |
1166 | * Set up the argument/result storage required for the RPC call. | |
1167 | */ | |
1168 | static void nfs_commit_rpcsetup(struct list_head *head, | |
788e7a89 TM |
1169 | struct nfs_write_data *data, |
1170 | int how) | |
1da177e4 | 1171 | { |
3da28eb1 | 1172 | struct nfs_page *first; |
1da177e4 | 1173 | struct inode *inode; |
788e7a89 | 1174 | int flags; |
1da177e4 LT |
1175 | |
1176 | /* Set up the RPC argument and reply structs | |
1177 | * NB: take care not to mess about with data->commit et al. */ | |
1178 | ||
1179 | list_splice_init(head, &data->pages); | |
1180 | first = nfs_list_entry(data->pages.next); | |
1da177e4 LT |
1181 | inode = first->wb_context->dentry->d_inode; |
1182 | ||
1da177e4 LT |
1183 | data->inode = inode; |
1184 | data->cred = first->wb_context->cred; | |
1185 | ||
1186 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1187 | /* Note: we always request a commit of the entire inode */ |
1188 | data->args.offset = 0; | |
1189 | data->args.count = 0; | |
1190 | data->res.count = 0; | |
1da177e4 LT |
1191 | data->res.fattr = &data->fattr; |
1192 | data->res.verf = &data->verf; | |
0e574af1 | 1193 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1194 | |
1195 | /* Set up the initial task struct. */ | |
1196 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
1197 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data); | |
1da177e4 LT |
1198 | NFS_PROTO(inode)->commit_setup(data, how); |
1199 | ||
1200 | data->task.tk_priority = flush_task_priority(how); | |
1201 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 1202 | |
a3f565b1 | 1203 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); |
1da177e4 LT |
1204 | } |
1205 | ||
1206 | /* | |
1207 | * Commit dirty pages | |
1208 | */ | |
1209 | static int | |
40859d7e | 1210 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1211 | { |
1212 | struct nfs_write_data *data; | |
1213 | struct nfs_page *req; | |
1214 | ||
e9f7bee1 | 1215 | data = nfs_commit_alloc(); |
1da177e4 LT |
1216 | |
1217 | if (!data) | |
1218 | goto out_bad; | |
1219 | ||
1220 | /* Set up the argument struct */ | |
1221 | nfs_commit_rpcsetup(head, data, how); | |
1222 | ||
1223 | nfs_execute_write(data); | |
1224 | return 0; | |
1225 | out_bad: | |
1226 | while (!list_empty(head)) { | |
1227 | req = nfs_list_entry(head->next); | |
1228 | nfs_list_remove_request(req); | |
1229 | nfs_mark_request_commit(req); | |
83715ad5 | 1230 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
5c2d97cb | 1231 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1232 | } |
1233 | return -ENOMEM; | |
1234 | } | |
1235 | ||
1236 | /* | |
1237 | * COMMIT call returned | |
1238 | */ | |
788e7a89 | 1239 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1240 | { |
963d8fe5 | 1241 | struct nfs_write_data *data = calldata; |
1da177e4 | 1242 | struct nfs_page *req; |
1da177e4 | 1243 | |
a3f565b1 | 1244 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
1da177e4 LT |
1245 | task->tk_pid, task->tk_status); |
1246 | ||
788e7a89 TM |
1247 | /* Call the NFS version-specific code */ |
1248 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1249 | return; | |
1250 | ||
1da177e4 LT |
1251 | while (!list_empty(&data->pages)) { |
1252 | req = nfs_list_entry(data->pages.next); | |
1253 | nfs_list_remove_request(req); | |
612c9384 | 1254 | clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
fd39fc85 | 1255 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
1da177e4 LT |
1256 | |
1257 | dprintk("NFS: commit (%s/%Ld %d@%Ld)", | |
1258 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1259 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1260 | req->wb_bytes, | |
1261 | (long long)req_offset(req)); | |
1262 | if (task->tk_status < 0) { | |
1263 | req->wb_context->error = task->tk_status; | |
1264 | nfs_inode_remove_request(req); | |
1265 | dprintk(", error = %d\n", task->tk_status); | |
1266 | goto next; | |
1267 | } | |
1268 | ||
1269 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1270 | * returned by the server against all stored verfs. */ | |
1271 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1272 | /* We have a match */ | |
1273 | nfs_inode_remove_request(req); | |
1274 | dprintk(" OK\n"); | |
1275 | goto next; | |
1276 | } | |
1277 | /* We have a mismatch. Write the page again */ | |
1278 | dprintk(" mismatch\n"); | |
61822ab5 | 1279 | nfs_redirty_request(req); |
1da177e4 | 1280 | next: |
c6a556b8 | 1281 | nfs_clear_page_writeback(req); |
1da177e4 | 1282 | } |
1da177e4 | 1283 | } |
788e7a89 TM |
1284 | |
1285 | static const struct rpc_call_ops nfs_commit_ops = { | |
1286 | .rpc_call_done = nfs_commit_done, | |
1287 | .rpc_release = nfs_commit_release, | |
1288 | }; | |
c42de9dd TM |
1289 | #else |
1290 | static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) | |
1291 | { | |
1292 | return 0; | |
1293 | } | |
1da177e4 LT |
1294 | #endif |
1295 | ||
3f442547 | 1296 | static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1297 | { |
28c6925f | 1298 | struct nfs_inode *nfsi = NFS_I(mapping->host); |
1da177e4 | 1299 | LIST_HEAD(head); |
3f442547 | 1300 | long res; |
1da177e4 LT |
1301 | |
1302 | spin_lock(&nfsi->req_lock); | |
3f442547 | 1303 | res = nfs_scan_dirty(mapping, wbc, &head); |
1da177e4 | 1304 | spin_unlock(&nfsi->req_lock); |
ab0a3dbe | 1305 | if (res) { |
28c6925f | 1306 | int error = nfs_flush_list(mapping->host, &head, res, how); |
7d46a49f TM |
1307 | if (error < 0) |
1308 | return error; | |
ab0a3dbe | 1309 | } |
1da177e4 LT |
1310 | return res; |
1311 | } | |
1312 | ||
1313 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
3da28eb1 | 1314 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 LT |
1315 | { |
1316 | struct nfs_inode *nfsi = NFS_I(inode); | |
1317 | LIST_HEAD(head); | |
7d46a49f | 1318 | int res; |
1da177e4 LT |
1319 | |
1320 | spin_lock(&nfsi->req_lock); | |
3da28eb1 TM |
1321 | res = nfs_scan_commit(inode, &head, 0, 0); |
1322 | spin_unlock(&nfsi->req_lock); | |
1da177e4 | 1323 | if (res) { |
7d46a49f | 1324 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1325 | if (error < 0) |
1326 | return error; | |
1327 | } | |
1da177e4 LT |
1328 | return res; |
1329 | } | |
1330 | #endif | |
1331 | ||
1c75950b | 1332 | long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1333 | { |
1c75950b | 1334 | struct inode *inode = mapping->host; |
c42de9dd | 1335 | struct nfs_inode *nfsi = NFS_I(inode); |
1c75950b TM |
1336 | unsigned long idx_start, idx_end; |
1337 | unsigned int npages = 0; | |
c42de9dd | 1338 | LIST_HEAD(head); |
70b9ecbd | 1339 | int nocommit = how & FLUSH_NOCOMMIT; |
3f442547 | 1340 | long pages, ret; |
1da177e4 | 1341 | |
1c75950b TM |
1342 | /* FIXME */ |
1343 | if (wbc->range_cyclic) | |
1344 | idx_start = 0; | |
1345 | else { | |
1346 | idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1347 | idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1348 | if (idx_end > idx_start) { | |
1349 | unsigned long l_npages = 1 + idx_end - idx_start; | |
1350 | npages = l_npages; | |
1351 | if (sizeof(npages) != sizeof(l_npages) && | |
1352 | (unsigned long)npages != l_npages) | |
1353 | npages = 0; | |
1354 | } | |
1355 | } | |
c42de9dd TM |
1356 | how &= ~FLUSH_NOCOMMIT; |
1357 | spin_lock(&nfsi->req_lock); | |
1da177e4 | 1358 | do { |
1c75950b | 1359 | wbc->pages_skipped = 0; |
c42de9dd TM |
1360 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); |
1361 | if (ret != 0) | |
70b9ecbd | 1362 | continue; |
1c75950b | 1363 | pages = nfs_scan_dirty(mapping, wbc, &head); |
c42de9dd TM |
1364 | if (pages != 0) { |
1365 | spin_unlock(&nfsi->req_lock); | |
e8e058e8 | 1366 | if (how & FLUSH_INVALIDATE) { |
83715ad5 | 1367 | nfs_cancel_dirty_list(&head); |
e8e058e8 TM |
1368 | ret = pages; |
1369 | } else | |
d2ccddf0 | 1370 | ret = nfs_flush_list(inode, &head, pages, how); |
c42de9dd TM |
1371 | spin_lock(&nfsi->req_lock); |
1372 | continue; | |
1373 | } | |
1c75950b TM |
1374 | if (wbc->pages_skipped != 0) |
1375 | continue; | |
c42de9dd TM |
1376 | if (nocommit) |
1377 | break; | |
d2ccddf0 | 1378 | pages = nfs_scan_commit(inode, &head, idx_start, npages); |
1c75950b TM |
1379 | if (pages == 0) { |
1380 | if (wbc->pages_skipped != 0) | |
1381 | continue; | |
c42de9dd | 1382 | break; |
1c75950b | 1383 | } |
d2ccddf0 TM |
1384 | if (how & FLUSH_INVALIDATE) { |
1385 | spin_unlock(&nfsi->req_lock); | |
83715ad5 | 1386 | nfs_cancel_commit_list(&head); |
e8e058e8 | 1387 | ret = pages; |
d2ccddf0 TM |
1388 | spin_lock(&nfsi->req_lock); |
1389 | continue; | |
1390 | } | |
1391 | pages += nfs_scan_commit(inode, &head, 0, 0); | |
c42de9dd TM |
1392 | spin_unlock(&nfsi->req_lock); |
1393 | ret = nfs_commit_list(inode, &head, how); | |
1394 | spin_lock(&nfsi->req_lock); | |
1395 | } while (ret >= 0); | |
1396 | spin_unlock(&nfsi->req_lock); | |
1397 | return ret; | |
1da177e4 LT |
1398 | } |
1399 | ||
1c75950b TM |
1400 | /* |
1401 | * flush the inode to disk. | |
1402 | */ | |
1403 | int nfs_wb_all(struct inode *inode) | |
1404 | { | |
1405 | struct address_space *mapping = inode->i_mapping; | |
1406 | struct writeback_control wbc = { | |
1407 | .bdi = mapping->backing_dev_info, | |
1408 | .sync_mode = WB_SYNC_ALL, | |
1409 | .nr_to_write = LONG_MAX, | |
61822ab5 | 1410 | .for_writepages = 1, |
1c75950b TM |
1411 | .range_cyclic = 1, |
1412 | }; | |
1413 | int ret; | |
1414 | ||
61822ab5 TM |
1415 | ret = generic_writepages(mapping, &wbc); |
1416 | if (ret < 0) | |
1417 | goto out; | |
1c75950b TM |
1418 | ret = nfs_sync_mapping_wait(mapping, &wbc, 0); |
1419 | if (ret >= 0) | |
1420 | return 0; | |
61822ab5 | 1421 | out: |
e507d9eb | 1422 | __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); |
1c75950b TM |
1423 | return ret; |
1424 | } | |
1425 | ||
1426 | int nfs_sync_mapping_range(struct address_space *mapping, loff_t range_start, loff_t range_end, int how) | |
1427 | { | |
1428 | struct writeback_control wbc = { | |
1429 | .bdi = mapping->backing_dev_info, | |
1430 | .sync_mode = WB_SYNC_ALL, | |
1431 | .nr_to_write = LONG_MAX, | |
1432 | .range_start = range_start, | |
1433 | .range_end = range_end, | |
61822ab5 | 1434 | .for_writepages = 1, |
1c75950b TM |
1435 | }; |
1436 | int ret; | |
1437 | ||
61822ab5 TM |
1438 | if (!(how & FLUSH_NOWRITEPAGE)) { |
1439 | ret = generic_writepages(mapping, &wbc); | |
1440 | if (ret < 0) | |
1441 | goto out; | |
1442 | } | |
1c75950b TM |
1443 | ret = nfs_sync_mapping_wait(mapping, &wbc, how); |
1444 | if (ret >= 0) | |
1445 | return 0; | |
61822ab5 | 1446 | out: |
e507d9eb | 1447 | __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); |
1c75950b TM |
1448 | return ret; |
1449 | } | |
1450 | ||
61822ab5 | 1451 | int nfs_wb_page_priority(struct inode *inode, struct page *page, int how) |
1c75950b TM |
1452 | { |
1453 | loff_t range_start = page_offset(page); | |
1454 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
4d770ccf TM |
1455 | struct writeback_control wbc = { |
1456 | .bdi = page->mapping->backing_dev_info, | |
1457 | .sync_mode = WB_SYNC_ALL, | |
1458 | .nr_to_write = LONG_MAX, | |
1459 | .range_start = range_start, | |
1460 | .range_end = range_end, | |
1461 | }; | |
1462 | int ret; | |
1c75950b | 1463 | |
4d770ccf TM |
1464 | BUG_ON(!PageLocked(page)); |
1465 | if (!(how & FLUSH_NOWRITEPAGE) && clear_page_dirty_for_io(page)) { | |
1466 | ret = nfs_writepage_locked(page, &wbc); | |
1467 | if (ret < 0) | |
1468 | goto out; | |
1469 | } | |
f40313ac TM |
1470 | if (!PagePrivate(page)) |
1471 | return 0; | |
4d770ccf TM |
1472 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); |
1473 | if (ret >= 0) | |
1474 | return 0; | |
1475 | out: | |
e507d9eb | 1476 | __mark_inode_dirty(inode, I_DIRTY_PAGES); |
4d770ccf | 1477 | return ret; |
1c75950b TM |
1478 | } |
1479 | ||
1480 | /* | |
1481 | * Write back all requests on one page - we do this before reading it. | |
1482 | */ | |
1483 | int nfs_wb_page(struct inode *inode, struct page* page) | |
1484 | { | |
4d770ccf | 1485 | return nfs_wb_page_priority(inode, page, FLUSH_STABLE); |
1c75950b TM |
1486 | } |
1487 | ||
1a54533e TM |
1488 | int nfs_set_page_dirty(struct page *page) |
1489 | { | |
d585158b TM |
1490 | struct address_space *mapping = page->mapping; |
1491 | struct inode *inode; | |
1492 | spinlock_t *req_lock; | |
1a54533e | 1493 | struct nfs_page *req; |
2b82f190 | 1494 | int ret; |
1a54533e | 1495 | |
d585158b TM |
1496 | if (!mapping) |
1497 | goto out_raced; | |
1498 | inode = mapping->host; | |
1499 | if (!inode) | |
1500 | goto out_raced; | |
1501 | req_lock = &NFS_I(inode)->req_lock; | |
2b82f190 TM |
1502 | spin_lock(req_lock); |
1503 | req = nfs_page_find_request_locked(page); | |
1a54533e TM |
1504 | if (req != NULL) { |
1505 | /* Mark any existing write requests for flushing */ | |
2b82f190 TM |
1506 | ret = !test_and_set_bit(PG_NEED_FLUSH, &req->wb_flags); |
1507 | spin_unlock(req_lock); | |
1a54533e | 1508 | nfs_release_request(req); |
2b82f190 | 1509 | return ret; |
1a54533e | 1510 | } |
2b82f190 TM |
1511 | ret = __set_page_dirty_nobuffers(page); |
1512 | spin_unlock(req_lock); | |
1513 | return ret; | |
d585158b TM |
1514 | out_raced: |
1515 | return !TestSetPageDirty(page); | |
1a54533e TM |
1516 | } |
1517 | ||
1c75950b | 1518 | |
f7b422b1 | 1519 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1520 | { |
1521 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1522 | sizeof(struct nfs_write_data), | |
1523 | 0, SLAB_HWCACHE_ALIGN, | |
1524 | NULL, NULL); | |
1525 | if (nfs_wdata_cachep == NULL) | |
1526 | return -ENOMEM; | |
1527 | ||
93d2341c MD |
1528 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1529 | nfs_wdata_cachep); | |
1da177e4 LT |
1530 | if (nfs_wdata_mempool == NULL) |
1531 | return -ENOMEM; | |
1532 | ||
93d2341c MD |
1533 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1534 | nfs_wdata_cachep); | |
1da177e4 LT |
1535 | if (nfs_commit_mempool == NULL) |
1536 | return -ENOMEM; | |
1537 | ||
89a09141 PZ |
1538 | /* |
1539 | * NFS congestion size, scale with available memory. | |
1540 | * | |
1541 | * 64MB: 8192k | |
1542 | * 128MB: 11585k | |
1543 | * 256MB: 16384k | |
1544 | * 512MB: 23170k | |
1545 | * 1GB: 32768k | |
1546 | * 2GB: 46340k | |
1547 | * 4GB: 65536k | |
1548 | * 8GB: 92681k | |
1549 | * 16GB: 131072k | |
1550 | * | |
1551 | * This allows larger machines to have larger/more transfers. | |
1552 | * Limit the default to 256M | |
1553 | */ | |
1554 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); | |
1555 | if (nfs_congestion_kb > 256*1024) | |
1556 | nfs_congestion_kb = 256*1024; | |
1557 | ||
1da177e4 LT |
1558 | return 0; |
1559 | } | |
1560 | ||
266bee88 | 1561 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1562 | { |
1563 | mempool_destroy(nfs_commit_mempool); | |
1564 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1565 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1566 | } |
1567 |