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); | |
e261f51f | 41 | static void nfs_mark_request_dirty(struct nfs_page *req); |
3f442547 | 42 | static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how); |
788e7a89 TM |
43 | static const struct rpc_call_ops nfs_write_partial_ops; |
44 | static const struct rpc_call_ops nfs_write_full_ops; | |
45 | static const struct rpc_call_ops nfs_commit_ops; | |
1da177e4 | 46 | |
e18b890b | 47 | static struct kmem_cache *nfs_wdata_cachep; |
3feb2d49 | 48 | static mempool_t *nfs_wdata_mempool; |
1da177e4 LT |
49 | static mempool_t *nfs_commit_mempool; |
50 | ||
e9f7bee1 | 51 | struct nfs_write_data *nfs_commit_alloc(void) |
1da177e4 | 52 | { |
e6b4f8da | 53 | struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS); |
40859d7e | 54 | |
1da177e4 LT |
55 | if (p) { |
56 | memset(p, 0, sizeof(*p)); | |
57 | INIT_LIST_HEAD(&p->pages); | |
58 | } | |
59 | return p; | |
60 | } | |
61 | ||
8aca67f0 | 62 | void nfs_commit_rcu_free(struct rcu_head *head) |
1da177e4 | 63 | { |
8aca67f0 | 64 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
40859d7e CL |
65 | if (p && (p->pagevec != &p->page_array[0])) |
66 | kfree(p->pagevec); | |
1da177e4 LT |
67 | mempool_free(p, nfs_commit_mempool); |
68 | } | |
69 | ||
8aca67f0 TM |
70 | void nfs_commit_free(struct nfs_write_data *wdata) |
71 | { | |
72 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_commit_rcu_free); | |
73 | } | |
74 | ||
e9f7bee1 | 75 | struct nfs_write_data *nfs_writedata_alloc(size_t len) |
3feb2d49 | 76 | { |
e9f7bee1 | 77 | unsigned int pagecount = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
e6b4f8da | 78 | struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS); |
3feb2d49 TM |
79 | |
80 | if (p) { | |
81 | memset(p, 0, sizeof(*p)); | |
82 | INIT_LIST_HEAD(&p->pages); | |
e9f7bee1 | 83 | p->npages = pagecount; |
0d0b5cb3 CL |
84 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
85 | p->pagevec = p->page_array; | |
3feb2d49 | 86 | else { |
0d0b5cb3 CL |
87 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
88 | if (!p->pagevec) { | |
3feb2d49 TM |
89 | mempool_free(p, nfs_wdata_mempool); |
90 | p = NULL; | |
91 | } | |
92 | } | |
93 | } | |
94 | return p; | |
95 | } | |
96 | ||
8aca67f0 | 97 | static void nfs_writedata_rcu_free(struct rcu_head *head) |
3feb2d49 | 98 | { |
8aca67f0 | 99 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
3feb2d49 TM |
100 | if (p && (p->pagevec != &p->page_array[0])) |
101 | kfree(p->pagevec); | |
102 | mempool_free(p, nfs_wdata_mempool); | |
103 | } | |
104 | ||
8aca67f0 TM |
105 | static void nfs_writedata_free(struct nfs_write_data *wdata) |
106 | { | |
107 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_writedata_rcu_free); | |
108 | } | |
109 | ||
963d8fe5 | 110 | void nfs_writedata_release(void *wdata) |
1da177e4 | 111 | { |
1da177e4 LT |
112 | nfs_writedata_free(wdata); |
113 | } | |
114 | ||
277459d2 TM |
115 | static struct nfs_page *nfs_page_find_request_locked(struct page *page) |
116 | { | |
117 | struct nfs_page *req = NULL; | |
118 | ||
119 | if (PagePrivate(page)) { | |
120 | req = (struct nfs_page *)page_private(page); | |
121 | if (req != NULL) | |
122 | atomic_inc(&req->wb_count); | |
123 | } | |
124 | return req; | |
125 | } | |
126 | ||
127 | static struct nfs_page *nfs_page_find_request(struct page *page) | |
128 | { | |
129 | struct nfs_page *req = NULL; | |
130 | spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock; | |
131 | ||
132 | spin_lock(req_lock); | |
133 | req = nfs_page_find_request_locked(page); | |
134 | spin_unlock(req_lock); | |
135 | return req; | |
136 | } | |
137 | ||
1da177e4 LT |
138 | /* Adjust the file length if we're writing beyond the end */ |
139 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) | |
140 | { | |
141 | struct inode *inode = page->mapping->host; | |
142 | loff_t end, i_size = i_size_read(inode); | |
143 | unsigned long end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; | |
144 | ||
145 | if (i_size > 0 && page->index < end_index) | |
146 | return; | |
147 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); | |
148 | if (i_size >= end) | |
149 | return; | |
91d5b470 | 150 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
1da177e4 LT |
151 | i_size_write(inode, end); |
152 | } | |
153 | ||
a301b777 TM |
154 | /* A writeback failed: mark the page as bad, and invalidate the page cache */ |
155 | static void nfs_set_pageerror(struct page *page) | |
156 | { | |
157 | SetPageError(page); | |
158 | nfs_zap_mapping(page->mapping->host, page->mapping); | |
159 | } | |
160 | ||
1da177e4 LT |
161 | /* We can set the PG_uptodate flag if we see that a write request |
162 | * covers the full page. | |
163 | */ | |
164 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) | |
165 | { | |
1da177e4 LT |
166 | if (PageUptodate(page)) |
167 | return; | |
168 | if (base != 0) | |
169 | return; | |
49a70f27 | 170 | if (count != nfs_page_length(page)) |
1da177e4 | 171 | return; |
49a70f27 | 172 | if (count != PAGE_CACHE_SIZE) |
1da177e4 | 173 | memclear_highpage_flush(page, count, PAGE_CACHE_SIZE - count); |
49a70f27 | 174 | SetPageUptodate(page); |
1da177e4 LT |
175 | } |
176 | ||
e21195a7 | 177 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
1da177e4 LT |
178 | unsigned int offset, unsigned int count) |
179 | { | |
180 | struct nfs_page *req; | |
e21195a7 | 181 | int ret; |
1da177e4 | 182 | |
e21195a7 TM |
183 | for (;;) { |
184 | req = nfs_update_request(ctx, page, offset, count); | |
185 | if (!IS_ERR(req)) | |
186 | break; | |
187 | ret = PTR_ERR(req); | |
188 | if (ret != -EBUSY) | |
189 | return ret; | |
190 | ret = nfs_wb_page(page->mapping->host, page); | |
191 | if (ret != 0) | |
192 | return ret; | |
193 | } | |
1da177e4 LT |
194 | /* Update file length */ |
195 | nfs_grow_file(page, offset, count); | |
196 | /* Set the PG_uptodate flag? */ | |
197 | nfs_mark_uptodate(page, offset, count); | |
198 | nfs_unlock_request(req); | |
abd3e641 | 199 | return 0; |
1da177e4 LT |
200 | } |
201 | ||
202 | static int wb_priority(struct writeback_control *wbc) | |
203 | { | |
204 | if (wbc->for_reclaim) | |
205 | return FLUSH_HIGHPRI; | |
206 | if (wbc->for_kupdate) | |
207 | return FLUSH_LOWPRI; | |
208 | return 0; | |
209 | } | |
210 | ||
89a09141 PZ |
211 | /* |
212 | * NFS congestion control | |
213 | */ | |
214 | ||
215 | int nfs_congestion_kb; | |
216 | ||
217 | #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) | |
218 | #define NFS_CONGESTION_OFF_THRESH \ | |
219 | (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) | |
220 | ||
221 | static void nfs_set_page_writeback(struct page *page) | |
222 | { | |
223 | if (!test_set_page_writeback(page)) { | |
224 | struct inode *inode = page->mapping->host; | |
225 | struct nfs_server *nfss = NFS_SERVER(inode); | |
226 | ||
227 | if (atomic_inc_return(&nfss->writeback) > | |
228 | NFS_CONGESTION_ON_THRESH) | |
229 | set_bdi_congested(&nfss->backing_dev_info, WRITE); | |
230 | } | |
231 | } | |
232 | ||
233 | static void nfs_end_page_writeback(struct page *page) | |
234 | { | |
235 | struct inode *inode = page->mapping->host; | |
236 | struct nfs_server *nfss = NFS_SERVER(inode); | |
237 | ||
238 | end_page_writeback(page); | |
239 | if (atomic_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) { | |
240 | clear_bdi_congested(&nfss->backing_dev_info, WRITE); | |
241 | congestion_end(WRITE); | |
242 | } | |
243 | } | |
244 | ||
e261f51f TM |
245 | /* |
246 | * Find an associated nfs write request, and prepare to flush it out | |
247 | * Returns 1 if there was no write request, or if the request was | |
248 | * already tagged by nfs_set_page_dirty.Returns 0 if the request | |
249 | * was not tagged. | |
250 | * May also return an error if the user signalled nfs_wait_on_request(). | |
251 | */ | |
252 | static int nfs_page_mark_flush(struct page *page) | |
253 | { | |
254 | struct nfs_page *req; | |
255 | spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock; | |
256 | int ret; | |
257 | ||
258 | spin_lock(req_lock); | |
259 | for(;;) { | |
260 | req = nfs_page_find_request_locked(page); | |
261 | if (req == NULL) { | |
262 | spin_unlock(req_lock); | |
263 | return 1; | |
264 | } | |
265 | if (nfs_lock_request_dontget(req)) | |
266 | break; | |
267 | /* Note: If we hold the page lock, as is the case in nfs_writepage, | |
268 | * then the call to nfs_lock_request_dontget() will always | |
269 | * succeed provided that someone hasn't already marked the | |
270 | * request as dirty (in which case we don't care). | |
271 | */ | |
272 | spin_unlock(req_lock); | |
273 | ret = nfs_wait_on_request(req); | |
274 | nfs_release_request(req); | |
275 | if (ret != 0) | |
276 | return ret; | |
277 | spin_lock(req_lock); | |
278 | } | |
279 | spin_unlock(req_lock); | |
61822ab5 | 280 | if (test_and_set_bit(PG_FLUSHING, &req->wb_flags) == 0) { |
e261f51f | 281 | nfs_mark_request_dirty(req); |
89a09141 | 282 | nfs_set_page_writeback(page); |
61822ab5 | 283 | } |
e261f51f TM |
284 | ret = test_bit(PG_NEED_FLUSH, &req->wb_flags); |
285 | nfs_unlock_request(req); | |
286 | return ret; | |
287 | } | |
288 | ||
1da177e4 LT |
289 | /* |
290 | * Write an mmapped page to the server. | |
291 | */ | |
4d770ccf | 292 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
293 | { |
294 | struct nfs_open_context *ctx; | |
295 | struct inode *inode = page->mapping->host; | |
49a70f27 | 296 | unsigned offset; |
e261f51f | 297 | int err; |
1da177e4 | 298 | |
91d5b470 CL |
299 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
300 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
301 | ||
e261f51f TM |
302 | err = nfs_page_mark_flush(page); |
303 | if (err <= 0) | |
304 | goto out; | |
305 | err = 0; | |
49a70f27 TM |
306 | offset = nfs_page_length(page); |
307 | if (!offset) | |
1da177e4 | 308 | goto out; |
49a70f27 | 309 | |
d530838b | 310 | ctx = nfs_find_open_context(inode, NULL, FMODE_WRITE); |
1da177e4 LT |
311 | if (ctx == NULL) { |
312 | err = -EBADF; | |
313 | goto out; | |
314 | } | |
200baa21 | 315 | err = nfs_writepage_setup(ctx, page, 0, offset); |
1da177e4 | 316 | put_nfs_open_context(ctx); |
e261f51f TM |
317 | if (err != 0) |
318 | goto out; | |
319 | err = nfs_page_mark_flush(page); | |
320 | if (err > 0) | |
321 | err = 0; | |
1da177e4 | 322 | out: |
200baa21 | 323 | if (!wbc->for_writepages) |
02241bc4 | 324 | nfs_flush_mapping(page->mapping, wbc, FLUSH_STABLE|wb_priority(wbc)); |
4d770ccf TM |
325 | return err; |
326 | } | |
327 | ||
328 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
329 | { | |
330 | int err; | |
331 | ||
332 | err = nfs_writepage_locked(page, wbc); | |
1da177e4 | 333 | unlock_page(page); |
1da177e4 LT |
334 | return err; |
335 | } | |
336 | ||
1da177e4 LT |
337 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) |
338 | { | |
1da177e4 LT |
339 | struct inode *inode = mapping->host; |
340 | int err; | |
341 | ||
91d5b470 CL |
342 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
343 | ||
1da177e4 LT |
344 | err = generic_writepages(mapping, wbc); |
345 | if (err) | |
346 | return err; | |
28c6925f | 347 | err = nfs_flush_mapping(mapping, wbc, wb_priority(wbc)); |
1da177e4 LT |
348 | if (err < 0) |
349 | goto out; | |
91d5b470 | 350 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, err); |
d30c8348 | 351 | err = 0; |
1da177e4 | 352 | out: |
1da177e4 LT |
353 | return err; |
354 | } | |
355 | ||
356 | /* | |
357 | * Insert a write request into an inode | |
358 | */ | |
359 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) | |
360 | { | |
361 | struct nfs_inode *nfsi = NFS_I(inode); | |
362 | int error; | |
363 | ||
364 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); | |
365 | BUG_ON(error == -EEXIST); | |
366 | if (error) | |
367 | return error; | |
368 | if (!nfsi->npages) { | |
369 | igrab(inode); | |
370 | nfs_begin_data_update(inode); | |
371 | if (nfs_have_delegation(inode, FMODE_WRITE)) | |
372 | nfsi->change_attr++; | |
373 | } | |
deb7d638 | 374 | SetPagePrivate(req->wb_page); |
277459d2 | 375 | set_page_private(req->wb_page, (unsigned long)req); |
1da177e4 LT |
376 | nfsi->npages++; |
377 | atomic_inc(&req->wb_count); | |
378 | return 0; | |
379 | } | |
380 | ||
381 | /* | |
89a09141 | 382 | * Remove a write request from an inode |
1da177e4 LT |
383 | */ |
384 | static void nfs_inode_remove_request(struct nfs_page *req) | |
385 | { | |
386 | struct inode *inode = req->wb_context->dentry->d_inode; | |
387 | struct nfs_inode *nfsi = NFS_I(inode); | |
388 | ||
389 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
390 | ||
391 | spin_lock(&nfsi->req_lock); | |
277459d2 | 392 | set_page_private(req->wb_page, 0); |
deb7d638 | 393 | ClearPagePrivate(req->wb_page); |
1da177e4 LT |
394 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
395 | nfsi->npages--; | |
396 | if (!nfsi->npages) { | |
397 | spin_unlock(&nfsi->req_lock); | |
951a143b | 398 | nfs_end_data_update(inode); |
1da177e4 LT |
399 | iput(inode); |
400 | } else | |
401 | spin_unlock(&nfsi->req_lock); | |
402 | nfs_clear_request(req); | |
403 | nfs_release_request(req); | |
404 | } | |
405 | ||
1da177e4 LT |
406 | /* |
407 | * Add a request to the inode's dirty list. | |
408 | */ | |
409 | static void | |
410 | nfs_mark_request_dirty(struct nfs_page *req) | |
411 | { | |
412 | struct inode *inode = req->wb_context->dentry->d_inode; | |
413 | struct nfs_inode *nfsi = NFS_I(inode); | |
414 | ||
415 | spin_lock(&nfsi->req_lock); | |
3da28eb1 TM |
416 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
417 | req->wb_index, NFS_PAGE_TAG_DIRTY); | |
1da177e4 LT |
418 | nfs_list_add_request(req, &nfsi->dirty); |
419 | nfsi->ndirty++; | |
420 | spin_unlock(&nfsi->req_lock); | |
a1803044 | 421 | __mark_inode_dirty(inode, I_DIRTY_PAGES); |
1da177e4 LT |
422 | } |
423 | ||
61822ab5 TM |
424 | static void |
425 | nfs_redirty_request(struct nfs_page *req) | |
426 | { | |
427 | clear_bit(PG_FLUSHING, &req->wb_flags); | |
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 | { | |
e261f51f | 437 | return test_bit(PG_FLUSHING, &req->wb_flags) == 0; |
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++; | |
453 | spin_unlock(&nfsi->req_lock); | |
fd39fc85 | 454 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
a1803044 | 455 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1da177e4 LT |
456 | } |
457 | #endif | |
458 | ||
459 | /* | |
460 | * Wait for a request to complete. | |
461 | * | |
462 | * Interruptible by signals only if mounted with intr flag. | |
463 | */ | |
c42de9dd | 464 | static int nfs_wait_on_requests_locked(struct inode *inode, unsigned long idx_start, unsigned int npages) |
1da177e4 LT |
465 | { |
466 | struct nfs_inode *nfsi = NFS_I(inode); | |
467 | struct nfs_page *req; | |
468 | unsigned long idx_end, next; | |
469 | unsigned int res = 0; | |
470 | int error; | |
471 | ||
472 | if (npages == 0) | |
473 | idx_end = ~0; | |
474 | else | |
475 | idx_end = idx_start + npages - 1; | |
476 | ||
1da177e4 | 477 | next = idx_start; |
c6a556b8 | 478 | while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_WRITEBACK)) { |
1da177e4 LT |
479 | if (req->wb_index > idx_end) |
480 | break; | |
481 | ||
482 | next = req->wb_index + 1; | |
c6a556b8 | 483 | BUG_ON(!NFS_WBACK_BUSY(req)); |
1da177e4 LT |
484 | |
485 | atomic_inc(&req->wb_count); | |
486 | spin_unlock(&nfsi->req_lock); | |
487 | error = nfs_wait_on_request(req); | |
488 | nfs_release_request(req); | |
c42de9dd | 489 | spin_lock(&nfsi->req_lock); |
1da177e4 LT |
490 | if (error < 0) |
491 | return error; | |
1da177e4 LT |
492 | res++; |
493 | } | |
1da177e4 LT |
494 | return res; |
495 | } | |
496 | ||
83715ad5 | 497 | static void nfs_cancel_dirty_list(struct list_head *head) |
d2ccddf0 TM |
498 | { |
499 | struct nfs_page *req; | |
500 | while(!list_empty(head)) { | |
501 | req = nfs_list_entry(head->next); | |
502 | nfs_list_remove_request(req); | |
503 | nfs_inode_remove_request(req); | |
504 | nfs_clear_page_writeback(req); | |
505 | } | |
506 | } | |
507 | ||
83715ad5 TM |
508 | static void nfs_cancel_commit_list(struct list_head *head) |
509 | { | |
510 | struct nfs_page *req; | |
511 | ||
512 | while(!list_empty(head)) { | |
513 | req = nfs_list_entry(head->next); | |
b6dff26a | 514 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
83715ad5 TM |
515 | nfs_list_remove_request(req); |
516 | nfs_inode_remove_request(req); | |
b6dff26a | 517 | nfs_unlock_request(req); |
83715ad5 TM |
518 | } |
519 | } | |
520 | ||
1da177e4 LT |
521 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
522 | /* | |
523 | * nfs_scan_commit - Scan an inode for commit requests | |
524 | * @inode: NFS inode to scan | |
525 | * @dst: destination list | |
526 | * @idx_start: lower bound of page->index to scan. | |
527 | * @npages: idx_start + npages sets the upper bound to scan. | |
528 | * | |
529 | * Moves requests from the inode's 'commit' request list. | |
530 | * The requests are *not* checked to ensure that they form a contiguous set. | |
531 | */ | |
532 | static int | |
533 | nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
534 | { | |
535 | struct nfs_inode *nfsi = NFS_I(inode); | |
3da28eb1 TM |
536 | int res = 0; |
537 | ||
538 | if (nfsi->ncommit != 0) { | |
d2ccddf0 | 539 | res = nfs_scan_list(nfsi, &nfsi->commit, dst, idx_start, npages); |
3da28eb1 TM |
540 | nfsi->ncommit -= res; |
541 | if ((nfsi->ncommit == 0) != list_empty(&nfsi->commit)) | |
542 | printk(KERN_ERR "NFS: desynchronized value of nfs_i.ncommit.\n"); | |
543 | } | |
1da177e4 LT |
544 | return res; |
545 | } | |
c42de9dd TM |
546 | #else |
547 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
548 | { | |
549 | return 0; | |
550 | } | |
1da177e4 LT |
551 | #endif |
552 | ||
89a09141 | 553 | static int nfs_wait_on_write_congestion(struct address_space *mapping) |
1da177e4 | 554 | { |
89a09141 | 555 | struct inode *inode = mapping->host; |
1da177e4 | 556 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1da177e4 LT |
557 | int ret = 0; |
558 | ||
559 | might_sleep(); | |
560 | ||
561 | if (!bdi_write_congested(bdi)) | |
562 | return 0; | |
91d5b470 | 563 | |
89a09141 | 564 | nfs_inc_stats(inode, NFSIOS_CONGESTIONWAIT); |
91d5b470 | 565 | |
89a09141 PZ |
566 | do { |
567 | struct rpc_clnt *clnt = NFS_CLIENT(inode); | |
1da177e4 LT |
568 | sigset_t oldset; |
569 | ||
570 | rpc_clnt_sigmask(clnt, &oldset); | |
89a09141 | 571 | ret = congestion_wait_interruptible(WRITE, HZ/10); |
1da177e4 | 572 | rpc_clnt_sigunmask(clnt, &oldset); |
89a09141 PZ |
573 | if (ret == -ERESTARTSYS) |
574 | break; | |
575 | ret = 0; | |
576 | } while (bdi_write_congested(bdi)); | |
577 | ||
1da177e4 LT |
578 | return ret; |
579 | } | |
580 | ||
1da177e4 LT |
581 | /* |
582 | * Try to update any existing write request, or create one if there is none. | |
583 | * In order to match, the request's credentials must match those of | |
584 | * the calling process. | |
585 | * | |
586 | * Note: Should always be called with the Page Lock held! | |
587 | */ | |
588 | static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, | |
e21195a7 | 589 | struct page *page, unsigned int offset, unsigned int bytes) |
1da177e4 | 590 | { |
89a09141 PZ |
591 | struct address_space *mapping = page->mapping; |
592 | struct inode *inode = mapping->host; | |
1da177e4 LT |
593 | struct nfs_inode *nfsi = NFS_I(inode); |
594 | struct nfs_page *req, *new = NULL; | |
595 | unsigned long rqend, end; | |
596 | ||
597 | end = offset + bytes; | |
598 | ||
89a09141 | 599 | if (nfs_wait_on_write_congestion(mapping)) |
1da177e4 LT |
600 | return ERR_PTR(-ERESTARTSYS); |
601 | for (;;) { | |
602 | /* Loop over all inode entries and see if we find | |
603 | * A request for the page we wish to update | |
604 | */ | |
605 | spin_lock(&nfsi->req_lock); | |
277459d2 | 606 | req = nfs_page_find_request_locked(page); |
1da177e4 LT |
607 | if (req) { |
608 | if (!nfs_lock_request_dontget(req)) { | |
609 | int error; | |
277459d2 | 610 | |
1da177e4 LT |
611 | spin_unlock(&nfsi->req_lock); |
612 | error = nfs_wait_on_request(req); | |
613 | nfs_release_request(req); | |
1dd594b2 NB |
614 | if (error < 0) { |
615 | if (new) | |
616 | nfs_release_request(new); | |
1da177e4 | 617 | return ERR_PTR(error); |
1dd594b2 | 618 | } |
1da177e4 LT |
619 | continue; |
620 | } | |
621 | spin_unlock(&nfsi->req_lock); | |
622 | if (new) | |
623 | nfs_release_request(new); | |
624 | break; | |
625 | } | |
626 | ||
627 | if (new) { | |
628 | int error; | |
629 | nfs_lock_request_dontget(new); | |
630 | error = nfs_inode_add_request(inode, new); | |
631 | if (error) { | |
632 | spin_unlock(&nfsi->req_lock); | |
633 | nfs_unlock_request(new); | |
634 | return ERR_PTR(error); | |
635 | } | |
636 | spin_unlock(&nfsi->req_lock); | |
1da177e4 LT |
637 | return new; |
638 | } | |
639 | spin_unlock(&nfsi->req_lock); | |
640 | ||
641 | new = nfs_create_request(ctx, inode, page, offset, bytes); | |
642 | if (IS_ERR(new)) | |
643 | return new; | |
644 | } | |
645 | ||
646 | /* We have a request for our page. | |
647 | * If the creds don't match, or the | |
648 | * page addresses don't match, | |
649 | * tell the caller to wait on the conflicting | |
650 | * request. | |
651 | */ | |
652 | rqend = req->wb_offset + req->wb_bytes; | |
653 | if (req->wb_context != ctx | |
654 | || req->wb_page != page | |
655 | || !nfs_dirty_request(req) | |
656 | || offset > rqend || end < req->wb_offset) { | |
657 | nfs_unlock_request(req); | |
658 | return ERR_PTR(-EBUSY); | |
659 | } | |
660 | ||
661 | /* Okay, the request matches. Update the region */ | |
662 | if (offset < req->wb_offset) { | |
663 | req->wb_offset = offset; | |
664 | req->wb_pgbase = offset; | |
665 | req->wb_bytes = rqend - req->wb_offset; | |
666 | } | |
667 | ||
668 | if (end > rqend) | |
669 | req->wb_bytes = end - req->wb_offset; | |
670 | ||
671 | return req; | |
672 | } | |
673 | ||
674 | int nfs_flush_incompatible(struct file *file, struct page *page) | |
675 | { | |
676 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 | 677 | struct nfs_page *req; |
1a54533e | 678 | int do_flush, status; |
1da177e4 LT |
679 | /* |
680 | * Look for a request corresponding to this page. If there | |
681 | * is one, and it belongs to another file, we flush it out | |
682 | * before we try to copy anything into the page. Do this | |
683 | * due to the lack of an ACCESS-type call in NFSv2. | |
684 | * Also do the same if we find a request from an existing | |
685 | * dropped page. | |
686 | */ | |
1a54533e TM |
687 | do { |
688 | req = nfs_page_find_request(page); | |
689 | if (req == NULL) | |
690 | return 0; | |
691 | do_flush = req->wb_page != page || req->wb_context != ctx | |
e261f51f | 692 | || !nfs_dirty_request(req); |
1da177e4 | 693 | nfs_release_request(req); |
1a54533e TM |
694 | if (!do_flush) |
695 | return 0; | |
696 | status = nfs_wb_page(page->mapping->host, page); | |
697 | } while (status == 0); | |
698 | return status; | |
1da177e4 LT |
699 | } |
700 | ||
701 | /* | |
702 | * Update and possibly write a cached page of an NFS file. | |
703 | * | |
704 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
705 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
706 | */ | |
707 | int nfs_updatepage(struct file *file, struct page *page, | |
708 | unsigned int offset, unsigned int count) | |
709 | { | |
710 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 | 711 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
712 | int status = 0; |
713 | ||
91d5b470 CL |
714 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
715 | ||
1da177e4 | 716 | dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", |
01cce933 JJS |
717 | file->f_path.dentry->d_parent->d_name.name, |
718 | file->f_path.dentry->d_name.name, count, | |
0bbacc40 | 719 | (long long)(page_offset(page) +offset)); |
1da177e4 | 720 | |
1da177e4 LT |
721 | /* If we're not using byte range locks, and we know the page |
722 | * is entirely in cache, it may be more efficient to avoid | |
723 | * fragmenting write requests. | |
724 | */ | |
ab0a3dbe | 725 | if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) { |
49a70f27 | 726 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 727 | offset = 0; |
1da177e4 LT |
728 | } |
729 | ||
e21195a7 | 730 | status = nfs_writepage_setup(ctx, page, offset, count); |
e261f51f | 731 | __set_page_dirty_nobuffers(page); |
1da177e4 | 732 | |
1da177e4 LT |
733 | dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", |
734 | status, (long long)i_size_read(inode)); | |
735 | if (status < 0) | |
a301b777 | 736 | nfs_set_pageerror(page); |
1da177e4 LT |
737 | return status; |
738 | } | |
739 | ||
740 | static void nfs_writepage_release(struct nfs_page *req) | |
741 | { | |
89a09141 | 742 | nfs_end_page_writeback(req->wb_page); |
1da177e4 LT |
743 | |
744 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
745 | if (!PageError(req->wb_page)) { | |
746 | if (NFS_NEED_RESCHED(req)) { | |
61822ab5 | 747 | nfs_redirty_request(req); |
1da177e4 LT |
748 | goto out; |
749 | } else if (NFS_NEED_COMMIT(req)) { | |
750 | nfs_mark_request_commit(req); | |
751 | goto out; | |
752 | } | |
753 | } | |
754 | nfs_inode_remove_request(req); | |
755 | ||
756 | out: | |
757 | nfs_clear_commit(req); | |
758 | nfs_clear_reschedule(req); | |
759 | #else | |
760 | nfs_inode_remove_request(req); | |
761 | #endif | |
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 | */ | |
7d46a49f | 838 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, 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 | ||
850 | nbytes = req->wb_bytes; | |
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 LT |
864 | offset = 0; |
865 | nbytes = req->wb_bytes; | |
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 LT |
871 | |
872 | if (nbytes > wsize) { | |
788e7a89 TM |
873 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
874 | wsize, offset, how); | |
1da177e4 LT |
875 | offset += wsize; |
876 | nbytes -= wsize; | |
877 | } else { | |
788e7a89 TM |
878 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
879 | nbytes, offset, how); | |
1da177e4 LT |
880 | nbytes = 0; |
881 | } | |
882 | nfs_execute_write(data); | |
883 | } while (nbytes != 0); | |
884 | ||
885 | return 0; | |
886 | ||
887 | out_bad: | |
888 | while (!list_empty(&list)) { | |
889 | data = list_entry(list.next, struct nfs_write_data, pages); | |
890 | list_del(&data->pages); | |
8aca67f0 | 891 | nfs_writedata_release(data); |
1da177e4 | 892 | } |
61822ab5 | 893 | nfs_redirty_request(req); |
c6a556b8 | 894 | nfs_clear_page_writeback(req); |
1da177e4 LT |
895 | return -ENOMEM; |
896 | } | |
897 | ||
898 | /* | |
899 | * Create an RPC task for the given write request and kick it. | |
900 | * The page must have been locked by the caller. | |
901 | * | |
902 | * It may happen that the page we're passed is not marked dirty. | |
903 | * This is the case if nfs_updatepage detects a conflicting request | |
904 | * that has been written but not committed. | |
905 | */ | |
7d46a49f | 906 | static int nfs_flush_one(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
907 | { |
908 | struct nfs_page *req; | |
909 | struct page **pages; | |
910 | struct nfs_write_data *data; | |
911 | unsigned int count; | |
912 | ||
e9f7bee1 | 913 | data = nfs_writedata_alloc(NFS_SERVER(inode)->wsize); |
1da177e4 LT |
914 | if (!data) |
915 | goto out_bad; | |
916 | ||
917 | pages = data->pagevec; | |
918 | count = 0; | |
919 | while (!list_empty(head)) { | |
920 | req = nfs_list_entry(head->next); | |
921 | nfs_list_remove_request(req); | |
922 | nfs_list_add_request(req, &data->pages); | |
923 | ClearPageError(req->wb_page); | |
1da177e4 LT |
924 | *pages++ = req->wb_page; |
925 | count += req->wb_bytes; | |
926 | } | |
927 | req = nfs_list_entry(data->pages.next); | |
928 | ||
1da177e4 | 929 | /* Set up the argument struct */ |
788e7a89 | 930 | nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 LT |
931 | |
932 | nfs_execute_write(data); | |
933 | return 0; | |
934 | out_bad: | |
935 | while (!list_empty(head)) { | |
936 | struct nfs_page *req = nfs_list_entry(head->next); | |
937 | nfs_list_remove_request(req); | |
61822ab5 | 938 | nfs_redirty_request(req); |
c6a556b8 | 939 | nfs_clear_page_writeback(req); |
1da177e4 LT |
940 | } |
941 | return -ENOMEM; | |
942 | } | |
943 | ||
7d46a49f | 944 | static int nfs_flush_list(struct inode *inode, struct list_head *head, int npages, int how) |
1da177e4 LT |
945 | { |
946 | LIST_HEAD(one_request); | |
7d46a49f TM |
947 | int (*flush_one)(struct inode *, struct list_head *, int); |
948 | struct nfs_page *req; | |
949 | int wpages = NFS_SERVER(inode)->wpages; | |
950 | int wsize = NFS_SERVER(inode)->wsize; | |
951 | int error; | |
1da177e4 | 952 | |
7d46a49f TM |
953 | flush_one = nfs_flush_one; |
954 | if (wsize < PAGE_CACHE_SIZE) | |
955 | flush_one = nfs_flush_multi; | |
956 | /* For single writes, FLUSH_STABLE is more efficient */ | |
957 | if (npages <= wpages && npages == NFS_I(inode)->npages | |
958 | && nfs_list_entry(head->next)->wb_bytes <= wsize) | |
959 | how |= FLUSH_STABLE; | |
960 | ||
961 | do { | |
962 | nfs_coalesce_requests(head, &one_request, wpages); | |
1da177e4 | 963 | req = nfs_list_entry(one_request.next); |
7d46a49f | 964 | error = flush_one(inode, &one_request, how); |
1da177e4 | 965 | if (error < 0) |
7d46a49f TM |
966 | goto out_err; |
967 | } while (!list_empty(head)); | |
968 | return 0; | |
969 | out_err: | |
1da177e4 LT |
970 | while (!list_empty(head)) { |
971 | req = nfs_list_entry(head->next); | |
972 | nfs_list_remove_request(req); | |
61822ab5 | 973 | nfs_redirty_request(req); |
c6a556b8 | 974 | nfs_clear_page_writeback(req); |
1da177e4 LT |
975 | } |
976 | return error; | |
977 | } | |
978 | ||
979 | /* | |
980 | * Handle a write reply that flushed part of a page. | |
981 | */ | |
788e7a89 | 982 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 983 | { |
788e7a89 | 984 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
985 | struct nfs_page *req = data->req; |
986 | struct page *page = req->wb_page; | |
987 | ||
988 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
989 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
990 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
991 | req->wb_bytes, | |
992 | (long long)req_offset(req)); | |
993 | ||
788e7a89 TM |
994 | if (nfs_writeback_done(task, data) != 0) |
995 | return; | |
996 | ||
997 | if (task->tk_status < 0) { | |
a301b777 | 998 | nfs_set_pageerror(page); |
788e7a89 TM |
999 | req->wb_context->error = task->tk_status; |
1000 | dprintk(", error = %d\n", task->tk_status); | |
1da177e4 LT |
1001 | } else { |
1002 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
1003 | if (data->verf.committed < NFS_FILE_SYNC) { | |
1004 | if (!NFS_NEED_COMMIT(req)) { | |
1005 | nfs_defer_commit(req); | |
1006 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1007 | dprintk(" defer commit\n"); | |
1008 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
1009 | nfs_defer_reschedule(req); | |
1010 | dprintk(" server reboot detected\n"); | |
1011 | } | |
1012 | } else | |
1013 | #endif | |
1014 | dprintk(" OK\n"); | |
1015 | } | |
1016 | ||
1017 | if (atomic_dec_and_test(&req->wb_complete)) | |
1018 | nfs_writepage_release(req); | |
1019 | } | |
1020 | ||
788e7a89 TM |
1021 | static const struct rpc_call_ops nfs_write_partial_ops = { |
1022 | .rpc_call_done = nfs_writeback_done_partial, | |
1023 | .rpc_release = nfs_writedata_release, | |
1024 | }; | |
1025 | ||
1da177e4 LT |
1026 | /* |
1027 | * Handle a write reply that flushes a whole page. | |
1028 | * | |
1029 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
1030 | * writebacks since the page->count is kept > 1 for as long | |
1031 | * as the page has a write request pending. | |
1032 | */ | |
788e7a89 | 1033 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 1034 | { |
788e7a89 | 1035 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
1036 | struct nfs_page *req; |
1037 | struct page *page; | |
1038 | ||
788e7a89 TM |
1039 | if (nfs_writeback_done(task, data) != 0) |
1040 | return; | |
1041 | ||
1da177e4 LT |
1042 | /* Update attributes as result of writeback. */ |
1043 | while (!list_empty(&data->pages)) { | |
1044 | req = nfs_list_entry(data->pages.next); | |
1045 | nfs_list_remove_request(req); | |
1046 | page = req->wb_page; | |
1047 | ||
1048 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
1049 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1050 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1051 | req->wb_bytes, | |
1052 | (long long)req_offset(req)); | |
1053 | ||
788e7a89 | 1054 | if (task->tk_status < 0) { |
a301b777 | 1055 | nfs_set_pageerror(page); |
788e7a89 | 1056 | req->wb_context->error = task->tk_status; |
89a09141 | 1057 | nfs_end_page_writeback(page); |
1da177e4 | 1058 | nfs_inode_remove_request(req); |
788e7a89 | 1059 | dprintk(", error = %d\n", task->tk_status); |
1da177e4 LT |
1060 | goto next; |
1061 | } | |
89a09141 | 1062 | nfs_end_page_writeback(page); |
1da177e4 LT |
1063 | |
1064 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
1065 | if (data->args.stable != NFS_UNSTABLE || data->verf.committed == NFS_FILE_SYNC) { | |
1066 | nfs_inode_remove_request(req); | |
1067 | dprintk(" OK\n"); | |
1068 | goto next; | |
1069 | } | |
1070 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1071 | nfs_mark_request_commit(req); | |
1072 | dprintk(" marked for commit\n"); | |
1073 | #else | |
1074 | nfs_inode_remove_request(req); | |
1075 | #endif | |
1076 | next: | |
c6a556b8 | 1077 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1078 | } |
1079 | } | |
1080 | ||
788e7a89 TM |
1081 | static const struct rpc_call_ops nfs_write_full_ops = { |
1082 | .rpc_call_done = nfs_writeback_done_full, | |
1083 | .rpc_release = nfs_writedata_release, | |
1084 | }; | |
1085 | ||
1086 | ||
1da177e4 LT |
1087 | /* |
1088 | * This function is called when the WRITE call is complete. | |
1089 | */ | |
462d5b32 | 1090 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1091 | { |
1da177e4 LT |
1092 | struct nfs_writeargs *argp = &data->args; |
1093 | struct nfs_writeres *resp = &data->res; | |
788e7a89 | 1094 | int status; |
1da177e4 | 1095 | |
a3f565b1 | 1096 | dprintk("NFS: %5u nfs_writeback_done (status %d)\n", |
1da177e4 LT |
1097 | task->tk_pid, task->tk_status); |
1098 | ||
f551e44f CL |
1099 | /* |
1100 | * ->write_done will attempt to use post-op attributes to detect | |
1101 | * conflicting writes by other clients. A strict interpretation | |
1102 | * of close-to-open would allow us to continue caching even if | |
1103 | * another writer had changed the file, but some applications | |
1104 | * depend on tighter cache coherency when writing. | |
1105 | */ | |
788e7a89 TM |
1106 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1107 | if (status != 0) | |
1108 | return status; | |
91d5b470 CL |
1109 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1110 | ||
1da177e4 LT |
1111 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1112 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1113 | /* We tried a write call, but the server did not | |
1114 | * commit data to stable storage even though we | |
1115 | * requested it. | |
1116 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1117 | * the server reports NFS_DATA_SYNC, but performs | |
1118 | * NFS_FILE_SYNC. We therefore implement this checking | |
1119 | * as a dprintk() in order to avoid filling syslog. | |
1120 | */ | |
1121 | static unsigned long complain; | |
1122 | ||
1123 | if (time_before(complain, jiffies)) { | |
1124 | dprintk("NFS: faulty NFS server %s:" | |
1125 | " (committed = %d) != (stable = %d)\n", | |
54ceac45 | 1126 | NFS_SERVER(data->inode)->nfs_client->cl_hostname, |
1da177e4 LT |
1127 | resp->verf->committed, argp->stable); |
1128 | complain = jiffies + 300 * HZ; | |
1129 | } | |
1130 | } | |
1131 | #endif | |
1132 | /* Is this a short write? */ | |
1133 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1134 | static unsigned long complain; | |
1135 | ||
91d5b470 CL |
1136 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1137 | ||
1da177e4 LT |
1138 | /* Has the server at least made some progress? */ |
1139 | if (resp->count != 0) { | |
1140 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1141 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1142 | /* Resend from where the server left off */ | |
1143 | argp->offset += resp->count; | |
1144 | argp->pgbase += resp->count; | |
1145 | argp->count -= resp->count; | |
1146 | } else { | |
1147 | /* Resend as a stable write in order to avoid | |
1148 | * headaches in the case of a server crash. | |
1149 | */ | |
1150 | argp->stable = NFS_FILE_SYNC; | |
1151 | } | |
1152 | rpc_restart_call(task); | |
788e7a89 | 1153 | return -EAGAIN; |
1da177e4 LT |
1154 | } |
1155 | if (time_before(complain, jiffies)) { | |
1156 | printk(KERN_WARNING | |
1157 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1158 | argp->count); | |
1159 | complain = jiffies + 300 * HZ; | |
1160 | } | |
1161 | /* Can't do anything about it except throw an error. */ | |
1162 | task->tk_status = -EIO; | |
1163 | } | |
788e7a89 | 1164 | return 0; |
1da177e4 LT |
1165 | } |
1166 | ||
1167 | ||
1168 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
963d8fe5 | 1169 | void nfs_commit_release(void *wdata) |
1da177e4 | 1170 | { |
1da177e4 LT |
1171 | nfs_commit_free(wdata); |
1172 | } | |
1173 | ||
1174 | /* | |
1175 | * Set up the argument/result storage required for the RPC call. | |
1176 | */ | |
1177 | static void nfs_commit_rpcsetup(struct list_head *head, | |
788e7a89 TM |
1178 | struct nfs_write_data *data, |
1179 | int how) | |
1da177e4 | 1180 | { |
3da28eb1 | 1181 | struct nfs_page *first; |
1da177e4 | 1182 | struct inode *inode; |
788e7a89 | 1183 | int flags; |
1da177e4 LT |
1184 | |
1185 | /* Set up the RPC argument and reply structs | |
1186 | * NB: take care not to mess about with data->commit et al. */ | |
1187 | ||
1188 | list_splice_init(head, &data->pages); | |
1189 | first = nfs_list_entry(data->pages.next); | |
1da177e4 LT |
1190 | inode = first->wb_context->dentry->d_inode; |
1191 | ||
1da177e4 LT |
1192 | data->inode = inode; |
1193 | data->cred = first->wb_context->cred; | |
1194 | ||
1195 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1196 | /* Note: we always request a commit of the entire inode */ |
1197 | data->args.offset = 0; | |
1198 | data->args.count = 0; | |
1199 | data->res.count = 0; | |
1da177e4 LT |
1200 | data->res.fattr = &data->fattr; |
1201 | data->res.verf = &data->verf; | |
0e574af1 | 1202 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1203 | |
1204 | /* Set up the initial task struct. */ | |
1205 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
1206 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data); | |
1da177e4 LT |
1207 | NFS_PROTO(inode)->commit_setup(data, how); |
1208 | ||
1209 | data->task.tk_priority = flush_task_priority(how); | |
1210 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 1211 | |
a3f565b1 | 1212 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); |
1da177e4 LT |
1213 | } |
1214 | ||
1215 | /* | |
1216 | * Commit dirty pages | |
1217 | */ | |
1218 | static int | |
40859d7e | 1219 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1220 | { |
1221 | struct nfs_write_data *data; | |
1222 | struct nfs_page *req; | |
1223 | ||
e9f7bee1 | 1224 | data = nfs_commit_alloc(); |
1da177e4 LT |
1225 | |
1226 | if (!data) | |
1227 | goto out_bad; | |
1228 | ||
1229 | /* Set up the argument struct */ | |
1230 | nfs_commit_rpcsetup(head, data, how); | |
1231 | ||
1232 | nfs_execute_write(data); | |
1233 | return 0; | |
1234 | out_bad: | |
1235 | while (!list_empty(head)) { | |
1236 | req = nfs_list_entry(head->next); | |
1237 | nfs_list_remove_request(req); | |
1238 | nfs_mark_request_commit(req); | |
83715ad5 | 1239 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
5c2d97cb | 1240 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1241 | } |
1242 | return -ENOMEM; | |
1243 | } | |
1244 | ||
1245 | /* | |
1246 | * COMMIT call returned | |
1247 | */ | |
788e7a89 | 1248 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1249 | { |
963d8fe5 | 1250 | struct nfs_write_data *data = calldata; |
1da177e4 | 1251 | struct nfs_page *req; |
1da177e4 | 1252 | |
a3f565b1 | 1253 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
1da177e4 LT |
1254 | task->tk_pid, task->tk_status); |
1255 | ||
788e7a89 TM |
1256 | /* Call the NFS version-specific code */ |
1257 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1258 | return; | |
1259 | ||
1da177e4 LT |
1260 | while (!list_empty(&data->pages)) { |
1261 | req = nfs_list_entry(data->pages.next); | |
1262 | nfs_list_remove_request(req); | |
fd39fc85 | 1263 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
1da177e4 LT |
1264 | |
1265 | dprintk("NFS: commit (%s/%Ld %d@%Ld)", | |
1266 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1267 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1268 | req->wb_bytes, | |
1269 | (long long)req_offset(req)); | |
1270 | if (task->tk_status < 0) { | |
1271 | req->wb_context->error = task->tk_status; | |
1272 | nfs_inode_remove_request(req); | |
1273 | dprintk(", error = %d\n", task->tk_status); | |
1274 | goto next; | |
1275 | } | |
1276 | ||
1277 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1278 | * returned by the server against all stored verfs. */ | |
1279 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1280 | /* We have a match */ | |
1281 | nfs_inode_remove_request(req); | |
1282 | dprintk(" OK\n"); | |
1283 | goto next; | |
1284 | } | |
1285 | /* We have a mismatch. Write the page again */ | |
1286 | dprintk(" mismatch\n"); | |
61822ab5 | 1287 | nfs_redirty_request(req); |
1da177e4 | 1288 | next: |
c6a556b8 | 1289 | nfs_clear_page_writeback(req); |
1da177e4 | 1290 | } |
1da177e4 | 1291 | } |
788e7a89 TM |
1292 | |
1293 | static const struct rpc_call_ops nfs_commit_ops = { | |
1294 | .rpc_call_done = nfs_commit_done, | |
1295 | .rpc_release = nfs_commit_release, | |
1296 | }; | |
c42de9dd TM |
1297 | #else |
1298 | static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) | |
1299 | { | |
1300 | return 0; | |
1301 | } | |
1da177e4 LT |
1302 | #endif |
1303 | ||
3f442547 | 1304 | static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1305 | { |
28c6925f | 1306 | struct nfs_inode *nfsi = NFS_I(mapping->host); |
1da177e4 | 1307 | LIST_HEAD(head); |
3f442547 | 1308 | long res; |
1da177e4 LT |
1309 | |
1310 | spin_lock(&nfsi->req_lock); | |
3f442547 | 1311 | res = nfs_scan_dirty(mapping, wbc, &head); |
1da177e4 | 1312 | spin_unlock(&nfsi->req_lock); |
ab0a3dbe | 1313 | if (res) { |
28c6925f | 1314 | int error = nfs_flush_list(mapping->host, &head, res, how); |
7d46a49f TM |
1315 | if (error < 0) |
1316 | return error; | |
ab0a3dbe | 1317 | } |
1da177e4 LT |
1318 | return res; |
1319 | } | |
1320 | ||
1321 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
3da28eb1 | 1322 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 LT |
1323 | { |
1324 | struct nfs_inode *nfsi = NFS_I(inode); | |
1325 | LIST_HEAD(head); | |
7d46a49f | 1326 | int res; |
1da177e4 LT |
1327 | |
1328 | spin_lock(&nfsi->req_lock); | |
3da28eb1 TM |
1329 | res = nfs_scan_commit(inode, &head, 0, 0); |
1330 | spin_unlock(&nfsi->req_lock); | |
1da177e4 | 1331 | if (res) { |
7d46a49f | 1332 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1333 | if (error < 0) |
1334 | return error; | |
1335 | } | |
1da177e4 LT |
1336 | return res; |
1337 | } | |
1338 | #endif | |
1339 | ||
1c75950b | 1340 | long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1341 | { |
1c75950b | 1342 | struct inode *inode = mapping->host; |
c42de9dd | 1343 | struct nfs_inode *nfsi = NFS_I(inode); |
1c75950b TM |
1344 | unsigned long idx_start, idx_end; |
1345 | unsigned int npages = 0; | |
c42de9dd | 1346 | LIST_HEAD(head); |
70b9ecbd | 1347 | int nocommit = how & FLUSH_NOCOMMIT; |
3f442547 | 1348 | long pages, ret; |
1da177e4 | 1349 | |
1c75950b TM |
1350 | /* FIXME */ |
1351 | if (wbc->range_cyclic) | |
1352 | idx_start = 0; | |
1353 | else { | |
1354 | idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1355 | idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1356 | if (idx_end > idx_start) { | |
1357 | unsigned long l_npages = 1 + idx_end - idx_start; | |
1358 | npages = l_npages; | |
1359 | if (sizeof(npages) != sizeof(l_npages) && | |
1360 | (unsigned long)npages != l_npages) | |
1361 | npages = 0; | |
1362 | } | |
1363 | } | |
c42de9dd TM |
1364 | how &= ~FLUSH_NOCOMMIT; |
1365 | spin_lock(&nfsi->req_lock); | |
1da177e4 | 1366 | do { |
1c75950b | 1367 | wbc->pages_skipped = 0; |
c42de9dd TM |
1368 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); |
1369 | if (ret != 0) | |
70b9ecbd | 1370 | continue; |
1c75950b | 1371 | pages = nfs_scan_dirty(mapping, wbc, &head); |
c42de9dd TM |
1372 | if (pages != 0) { |
1373 | spin_unlock(&nfsi->req_lock); | |
e8e058e8 | 1374 | if (how & FLUSH_INVALIDATE) { |
83715ad5 | 1375 | nfs_cancel_dirty_list(&head); |
e8e058e8 TM |
1376 | ret = pages; |
1377 | } else | |
d2ccddf0 | 1378 | ret = nfs_flush_list(inode, &head, pages, how); |
c42de9dd TM |
1379 | spin_lock(&nfsi->req_lock); |
1380 | continue; | |
1381 | } | |
1c75950b TM |
1382 | if (wbc->pages_skipped != 0) |
1383 | continue; | |
c42de9dd TM |
1384 | if (nocommit) |
1385 | break; | |
d2ccddf0 | 1386 | pages = nfs_scan_commit(inode, &head, idx_start, npages); |
1c75950b TM |
1387 | if (pages == 0) { |
1388 | if (wbc->pages_skipped != 0) | |
1389 | continue; | |
c42de9dd | 1390 | break; |
1c75950b | 1391 | } |
d2ccddf0 TM |
1392 | if (how & FLUSH_INVALIDATE) { |
1393 | spin_unlock(&nfsi->req_lock); | |
83715ad5 | 1394 | nfs_cancel_commit_list(&head); |
e8e058e8 | 1395 | ret = pages; |
d2ccddf0 TM |
1396 | spin_lock(&nfsi->req_lock); |
1397 | continue; | |
1398 | } | |
1399 | pages += nfs_scan_commit(inode, &head, 0, 0); | |
c42de9dd TM |
1400 | spin_unlock(&nfsi->req_lock); |
1401 | ret = nfs_commit_list(inode, &head, how); | |
1402 | spin_lock(&nfsi->req_lock); | |
1403 | } while (ret >= 0); | |
1404 | spin_unlock(&nfsi->req_lock); | |
1405 | return ret; | |
1da177e4 LT |
1406 | } |
1407 | ||
1c75950b TM |
1408 | /* |
1409 | * flush the inode to disk. | |
1410 | */ | |
1411 | int nfs_wb_all(struct inode *inode) | |
1412 | { | |
1413 | struct address_space *mapping = inode->i_mapping; | |
1414 | struct writeback_control wbc = { | |
1415 | .bdi = mapping->backing_dev_info, | |
1416 | .sync_mode = WB_SYNC_ALL, | |
1417 | .nr_to_write = LONG_MAX, | |
61822ab5 | 1418 | .for_writepages = 1, |
1c75950b TM |
1419 | .range_cyclic = 1, |
1420 | }; | |
1421 | int ret; | |
1422 | ||
61822ab5 TM |
1423 | ret = generic_writepages(mapping, &wbc); |
1424 | if (ret < 0) | |
1425 | goto out; | |
1c75950b TM |
1426 | ret = nfs_sync_mapping_wait(mapping, &wbc, 0); |
1427 | if (ret >= 0) | |
1428 | return 0; | |
61822ab5 | 1429 | out: |
e507d9eb | 1430 | __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); |
1c75950b TM |
1431 | return ret; |
1432 | } | |
1433 | ||
1434 | int nfs_sync_mapping_range(struct address_space *mapping, loff_t range_start, loff_t range_end, int how) | |
1435 | { | |
1436 | struct writeback_control wbc = { | |
1437 | .bdi = mapping->backing_dev_info, | |
1438 | .sync_mode = WB_SYNC_ALL, | |
1439 | .nr_to_write = LONG_MAX, | |
1440 | .range_start = range_start, | |
1441 | .range_end = range_end, | |
61822ab5 | 1442 | .for_writepages = 1, |
1c75950b TM |
1443 | }; |
1444 | int ret; | |
1445 | ||
61822ab5 TM |
1446 | if (!(how & FLUSH_NOWRITEPAGE)) { |
1447 | ret = generic_writepages(mapping, &wbc); | |
1448 | if (ret < 0) | |
1449 | goto out; | |
1450 | } | |
1c75950b TM |
1451 | ret = nfs_sync_mapping_wait(mapping, &wbc, how); |
1452 | if (ret >= 0) | |
1453 | return 0; | |
61822ab5 | 1454 | out: |
e507d9eb | 1455 | __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); |
1c75950b TM |
1456 | return ret; |
1457 | } | |
1458 | ||
61822ab5 | 1459 | int nfs_wb_page_priority(struct inode *inode, struct page *page, int how) |
1c75950b TM |
1460 | { |
1461 | loff_t range_start = page_offset(page); | |
1462 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
4d770ccf TM |
1463 | struct writeback_control wbc = { |
1464 | .bdi = page->mapping->backing_dev_info, | |
1465 | .sync_mode = WB_SYNC_ALL, | |
1466 | .nr_to_write = LONG_MAX, | |
1467 | .range_start = range_start, | |
1468 | .range_end = range_end, | |
1469 | }; | |
1470 | int ret; | |
1c75950b | 1471 | |
4d770ccf TM |
1472 | BUG_ON(!PageLocked(page)); |
1473 | if (!(how & FLUSH_NOWRITEPAGE) && clear_page_dirty_for_io(page)) { | |
1474 | ret = nfs_writepage_locked(page, &wbc); | |
1475 | if (ret < 0) | |
1476 | goto out; | |
1477 | } | |
f40313ac TM |
1478 | if (!PagePrivate(page)) |
1479 | return 0; | |
4d770ccf TM |
1480 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); |
1481 | if (ret >= 0) | |
1482 | return 0; | |
1483 | out: | |
e507d9eb | 1484 | __mark_inode_dirty(inode, I_DIRTY_PAGES); |
4d770ccf | 1485 | return ret; |
1c75950b TM |
1486 | } |
1487 | ||
1488 | /* | |
1489 | * Write back all requests on one page - we do this before reading it. | |
1490 | */ | |
1491 | int nfs_wb_page(struct inode *inode, struct page* page) | |
1492 | { | |
4d770ccf | 1493 | return nfs_wb_page_priority(inode, page, FLUSH_STABLE); |
1c75950b TM |
1494 | } |
1495 | ||
1a54533e TM |
1496 | int nfs_set_page_dirty(struct page *page) |
1497 | { | |
1498 | struct nfs_page *req; | |
1499 | ||
1500 | req = nfs_page_find_request(page); | |
1501 | if (req != NULL) { | |
1502 | /* Mark any existing write requests for flushing */ | |
1503 | set_bit(PG_NEED_FLUSH, &req->wb_flags); | |
1504 | nfs_release_request(req); | |
1505 | } | |
1506 | return __set_page_dirty_nobuffers(page); | |
1507 | } | |
1508 | ||
1c75950b | 1509 | |
f7b422b1 | 1510 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1511 | { |
1512 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1513 | sizeof(struct nfs_write_data), | |
1514 | 0, SLAB_HWCACHE_ALIGN, | |
1515 | NULL, NULL); | |
1516 | if (nfs_wdata_cachep == NULL) | |
1517 | return -ENOMEM; | |
1518 | ||
93d2341c MD |
1519 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1520 | nfs_wdata_cachep); | |
1da177e4 LT |
1521 | if (nfs_wdata_mempool == NULL) |
1522 | return -ENOMEM; | |
1523 | ||
93d2341c MD |
1524 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1525 | nfs_wdata_cachep); | |
1da177e4 LT |
1526 | if (nfs_commit_mempool == NULL) |
1527 | return -ENOMEM; | |
1528 | ||
89a09141 PZ |
1529 | /* |
1530 | * NFS congestion size, scale with available memory. | |
1531 | * | |
1532 | * 64MB: 8192k | |
1533 | * 128MB: 11585k | |
1534 | * 256MB: 16384k | |
1535 | * 512MB: 23170k | |
1536 | * 1GB: 32768k | |
1537 | * 2GB: 46340k | |
1538 | * 4GB: 65536k | |
1539 | * 8GB: 92681k | |
1540 | * 16GB: 131072k | |
1541 | * | |
1542 | * This allows larger machines to have larger/more transfers. | |
1543 | * Limit the default to 256M | |
1544 | */ | |
1545 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); | |
1546 | if (nfs_congestion_kb > 256*1024) | |
1547 | nfs_congestion_kb = 256*1024; | |
1548 | ||
1da177e4 LT |
1549 | return 0; |
1550 | } | |
1551 | ||
266bee88 | 1552 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1553 | { |
1554 | mempool_destroy(nfs_commit_mempool); | |
1555 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1556 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1557 | } |
1558 |