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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/write.c | |
3 | * | |
4 | * Writing file data over NFS. | |
5 | * | |
6 | * We do it like this: When a (user) process wishes to write data to an | |
7 | * NFS file, a write request is allocated that contains the RPC task data | |
8 | * plus some info on the page to be written, and added to the inode's | |
9 | * write chain. If the process writes past the end of the page, an async | |
10 | * RPC call to write the page is scheduled immediately; otherwise, the call | |
11 | * is delayed for a few seconds. | |
12 | * | |
13 | * Just like readahead, no async I/O is performed if wsize < PAGE_SIZE. | |
14 | * | |
15 | * Write requests are kept on the inode's writeback list. Each entry in | |
16 | * that list references the page (portion) to be written. When the | |
17 | * cache timeout has expired, the RPC task is woken up, and tries to | |
18 | * lock the page. As soon as it manages to do so, the request is moved | |
19 | * from the writeback list to the writelock list. | |
20 | * | |
21 | * Note: we must make sure never to confuse the inode passed in the | |
22 | * write_page request with the one in page->inode. As far as I understand | |
23 | * it, these are different when doing a swap-out. | |
24 | * | |
25 | * To understand everything that goes on here and in the NFS read code, | |
26 | * one should be aware that a page is locked in exactly one of the following | |
27 | * cases: | |
28 | * | |
29 | * - A write request is in progress. | |
30 | * - A user process is in generic_file_write/nfs_update_page | |
31 | * - A user process is in generic_file_read | |
32 | * | |
33 | * Also note that because of the way pages are invalidated in | |
34 | * nfs_revalidate_inode, the following assertions hold: | |
35 | * | |
36 | * - If a page is dirty, there will be no read requests (a page will | |
37 | * not be re-read unless invalidated by nfs_revalidate_inode). | |
38 | * - If the page is not uptodate, there will be no pending write | |
39 | * requests, and no process will be in nfs_update_page. | |
40 | * | |
41 | * FIXME: Interaction with the vmscan routines is not optimal yet. | |
42 | * Either vmscan must be made nfs-savvy, or we need a different page | |
43 | * reclaim concept that supports something like FS-independent | |
44 | * buffer_heads with a b_ops-> field. | |
45 | * | |
46 | * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de> | |
47 | */ | |
48 | ||
1da177e4 LT |
49 | #include <linux/types.h> |
50 | #include <linux/slab.h> | |
51 | #include <linux/mm.h> | |
52 | #include <linux/pagemap.h> | |
53 | #include <linux/file.h> | |
1da177e4 LT |
54 | #include <linux/writeback.h> |
55 | ||
56 | #include <linux/sunrpc/clnt.h> | |
57 | #include <linux/nfs_fs.h> | |
58 | #include <linux/nfs_mount.h> | |
59 | #include <linux/nfs_page.h> | |
3fcfab16 AM |
60 | #include <linux/backing-dev.h> |
61 | ||
1da177e4 LT |
62 | #include <asm/uaccess.h> |
63 | #include <linux/smp_lock.h> | |
64 | ||
65 | #include "delegation.h" | |
49a70f27 | 66 | #include "internal.h" |
91d5b470 | 67 | #include "iostat.h" |
1da177e4 LT |
68 | |
69 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE | |
70 | ||
71 | #define MIN_POOL_WRITE (32) | |
72 | #define MIN_POOL_COMMIT (4) | |
73 | ||
74 | /* | |
75 | * Local function declarations | |
76 | */ | |
77 | static struct nfs_page * nfs_update_request(struct nfs_open_context*, | |
1da177e4 LT |
78 | struct page *, |
79 | unsigned int, unsigned int); | |
1da177e4 LT |
80 | static int nfs_wait_on_write_congestion(struct address_space *, int); |
81 | static int nfs_wait_on_requests(struct inode *, unsigned long, unsigned int); | |
3f442547 | 82 | static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how); |
1c75950b | 83 | static int nfs_wb_page_priority(struct inode *inode, struct page *page, int how); |
788e7a89 TM |
84 | static const struct rpc_call_ops nfs_write_partial_ops; |
85 | static const struct rpc_call_ops nfs_write_full_ops; | |
86 | static const struct rpc_call_ops nfs_commit_ops; | |
1da177e4 LT |
87 | |
88 | static kmem_cache_t *nfs_wdata_cachep; | |
3feb2d49 | 89 | static mempool_t *nfs_wdata_mempool; |
1da177e4 LT |
90 | static mempool_t *nfs_commit_mempool; |
91 | ||
92 | static DECLARE_WAIT_QUEUE_HEAD(nfs_write_congestion); | |
93 | ||
e9f7bee1 | 94 | struct nfs_write_data *nfs_commit_alloc(void) |
1da177e4 LT |
95 | { |
96 | struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, SLAB_NOFS); | |
40859d7e | 97 | |
1da177e4 LT |
98 | if (p) { |
99 | memset(p, 0, sizeof(*p)); | |
100 | INIT_LIST_HEAD(&p->pages); | |
101 | } | |
102 | return p; | |
103 | } | |
104 | ||
8aca67f0 | 105 | void nfs_commit_rcu_free(struct rcu_head *head) |
1da177e4 | 106 | { |
8aca67f0 | 107 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
40859d7e CL |
108 | if (p && (p->pagevec != &p->page_array[0])) |
109 | kfree(p->pagevec); | |
1da177e4 LT |
110 | mempool_free(p, nfs_commit_mempool); |
111 | } | |
112 | ||
8aca67f0 TM |
113 | void nfs_commit_free(struct nfs_write_data *wdata) |
114 | { | |
115 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_commit_rcu_free); | |
116 | } | |
117 | ||
e9f7bee1 | 118 | struct nfs_write_data *nfs_writedata_alloc(size_t len) |
3feb2d49 | 119 | { |
e9f7bee1 | 120 | unsigned int pagecount = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
3feb2d49 TM |
121 | struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, SLAB_NOFS); |
122 | ||
123 | if (p) { | |
124 | memset(p, 0, sizeof(*p)); | |
125 | INIT_LIST_HEAD(&p->pages); | |
e9f7bee1 | 126 | p->npages = pagecount; |
0d0b5cb3 CL |
127 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
128 | p->pagevec = p->page_array; | |
3feb2d49 | 129 | else { |
0d0b5cb3 CL |
130 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
131 | if (!p->pagevec) { | |
3feb2d49 TM |
132 | mempool_free(p, nfs_wdata_mempool); |
133 | p = NULL; | |
134 | } | |
135 | } | |
136 | } | |
137 | return p; | |
138 | } | |
139 | ||
8aca67f0 | 140 | static void nfs_writedata_rcu_free(struct rcu_head *head) |
3feb2d49 | 141 | { |
8aca67f0 | 142 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
3feb2d49 TM |
143 | if (p && (p->pagevec != &p->page_array[0])) |
144 | kfree(p->pagevec); | |
145 | mempool_free(p, nfs_wdata_mempool); | |
146 | } | |
147 | ||
8aca67f0 TM |
148 | static void nfs_writedata_free(struct nfs_write_data *wdata) |
149 | { | |
150 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_writedata_rcu_free); | |
151 | } | |
152 | ||
963d8fe5 | 153 | void nfs_writedata_release(void *wdata) |
1da177e4 | 154 | { |
1da177e4 LT |
155 | nfs_writedata_free(wdata); |
156 | } | |
157 | ||
277459d2 TM |
158 | static struct nfs_page *nfs_page_find_request_locked(struct page *page) |
159 | { | |
160 | struct nfs_page *req = NULL; | |
161 | ||
162 | if (PagePrivate(page)) { | |
163 | req = (struct nfs_page *)page_private(page); | |
164 | if (req != NULL) | |
165 | atomic_inc(&req->wb_count); | |
166 | } | |
167 | return req; | |
168 | } | |
169 | ||
170 | static struct nfs_page *nfs_page_find_request(struct page *page) | |
171 | { | |
172 | struct nfs_page *req = NULL; | |
173 | spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock; | |
174 | ||
175 | spin_lock(req_lock); | |
176 | req = nfs_page_find_request_locked(page); | |
177 | spin_unlock(req_lock); | |
178 | return req; | |
179 | } | |
180 | ||
1da177e4 LT |
181 | /* Adjust the file length if we're writing beyond the end */ |
182 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) | |
183 | { | |
184 | struct inode *inode = page->mapping->host; | |
185 | loff_t end, i_size = i_size_read(inode); | |
186 | unsigned long end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; | |
187 | ||
188 | if (i_size > 0 && page->index < end_index) | |
189 | return; | |
190 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); | |
191 | if (i_size >= end) | |
192 | return; | |
91d5b470 | 193 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
1da177e4 LT |
194 | i_size_write(inode, end); |
195 | } | |
196 | ||
197 | /* We can set the PG_uptodate flag if we see that a write request | |
198 | * covers the full page. | |
199 | */ | |
200 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) | |
201 | { | |
1da177e4 LT |
202 | if (PageUptodate(page)) |
203 | return; | |
204 | if (base != 0) | |
205 | return; | |
49a70f27 | 206 | if (count != nfs_page_length(page)) |
1da177e4 | 207 | return; |
49a70f27 | 208 | if (count != PAGE_CACHE_SIZE) |
1da177e4 | 209 | memclear_highpage_flush(page, count, PAGE_CACHE_SIZE - count); |
49a70f27 | 210 | SetPageUptodate(page); |
1da177e4 LT |
211 | } |
212 | ||
e21195a7 | 213 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
1da177e4 LT |
214 | unsigned int offset, unsigned int count) |
215 | { | |
216 | struct nfs_page *req; | |
e21195a7 | 217 | int ret; |
1da177e4 | 218 | |
e21195a7 TM |
219 | for (;;) { |
220 | req = nfs_update_request(ctx, page, offset, count); | |
221 | if (!IS_ERR(req)) | |
222 | break; | |
223 | ret = PTR_ERR(req); | |
224 | if (ret != -EBUSY) | |
225 | return ret; | |
226 | ret = nfs_wb_page(page->mapping->host, page); | |
227 | if (ret != 0) | |
228 | return ret; | |
229 | } | |
1da177e4 LT |
230 | /* Update file length */ |
231 | nfs_grow_file(page, offset, count); | |
232 | /* Set the PG_uptodate flag? */ | |
233 | nfs_mark_uptodate(page, offset, count); | |
234 | nfs_unlock_request(req); | |
abd3e641 | 235 | return 0; |
1da177e4 LT |
236 | } |
237 | ||
238 | static int wb_priority(struct writeback_control *wbc) | |
239 | { | |
240 | if (wbc->for_reclaim) | |
241 | return FLUSH_HIGHPRI; | |
242 | if (wbc->for_kupdate) | |
243 | return FLUSH_LOWPRI; | |
244 | return 0; | |
245 | } | |
246 | ||
247 | /* | |
248 | * Write an mmapped page to the server. | |
249 | */ | |
250 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
251 | { | |
252 | struct nfs_open_context *ctx; | |
253 | struct inode *inode = page->mapping->host; | |
1a54533e | 254 | struct nfs_page *req; |
49a70f27 | 255 | unsigned offset; |
1a54533e | 256 | int err = 0; |
1da177e4 | 257 | |
91d5b470 CL |
258 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
259 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
260 | ||
1a54533e TM |
261 | req = nfs_page_find_request(page); |
262 | if (req != NULL) { | |
263 | int flushme = test_bit(PG_NEED_FLUSH, &req->wb_flags); | |
264 | nfs_release_request(req); | |
265 | if (!flushme) | |
266 | goto out; | |
267 | /* Ensure we've flushed out the invalid write */ | |
268 | nfs_wb_page_priority(inode, page, wb_priority(wbc)); | |
269 | } | |
1da177e4 | 270 | |
49a70f27 TM |
271 | offset = nfs_page_length(page); |
272 | if (!offset) | |
1da177e4 | 273 | goto out; |
49a70f27 | 274 | |
d530838b | 275 | ctx = nfs_find_open_context(inode, NULL, FMODE_WRITE); |
1da177e4 LT |
276 | if (ctx == NULL) { |
277 | err = -EBADF; | |
278 | goto out; | |
279 | } | |
200baa21 | 280 | err = nfs_writepage_setup(ctx, page, 0, offset); |
1da177e4 | 281 | put_nfs_open_context(ctx); |
200baa21 | 282 | |
1da177e4 | 283 | out: |
200baa21 TM |
284 | if (!wbc->for_writepages) |
285 | nfs_flush_mapping(page->mapping, wbc, wb_priority(wbc)); | |
1da177e4 | 286 | unlock_page(page); |
1da177e4 LT |
287 | return err; |
288 | } | |
289 | ||
290 | /* | |
291 | * Note: causes nfs_update_request() to block on the assumption | |
292 | * that the writeback is generated due to memory pressure. | |
293 | */ | |
294 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) | |
295 | { | |
296 | struct backing_dev_info *bdi = mapping->backing_dev_info; | |
297 | struct inode *inode = mapping->host; | |
298 | int err; | |
299 | ||
91d5b470 CL |
300 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
301 | ||
1da177e4 LT |
302 | err = generic_writepages(mapping, wbc); |
303 | if (err) | |
304 | return err; | |
305 | while (test_and_set_bit(BDI_write_congested, &bdi->state) != 0) { | |
306 | if (wbc->nonblocking) | |
307 | return 0; | |
308 | nfs_wait_on_write_congestion(mapping, 0); | |
309 | } | |
28c6925f | 310 | err = nfs_flush_mapping(mapping, wbc, wb_priority(wbc)); |
1da177e4 LT |
311 | if (err < 0) |
312 | goto out; | |
91d5b470 | 313 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, err); |
1da177e4 LT |
314 | if (!wbc->nonblocking && wbc->sync_mode == WB_SYNC_ALL) { |
315 | err = nfs_wait_on_requests(inode, 0, 0); | |
316 | if (err < 0) | |
317 | goto out; | |
318 | } | |
3da28eb1 | 319 | err = nfs_commit_inode(inode, wb_priority(wbc)); |
3f442547 | 320 | if (err > 0) |
1da177e4 | 321 | err = 0; |
1da177e4 LT |
322 | out: |
323 | clear_bit(BDI_write_congested, &bdi->state); | |
324 | wake_up_all(&nfs_write_congestion); | |
3fcfab16 | 325 | congestion_end(WRITE); |
1da177e4 LT |
326 | return err; |
327 | } | |
328 | ||
329 | /* | |
330 | * Insert a write request into an inode | |
331 | */ | |
332 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) | |
333 | { | |
334 | struct nfs_inode *nfsi = NFS_I(inode); | |
335 | int error; | |
336 | ||
337 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); | |
338 | BUG_ON(error == -EEXIST); | |
339 | if (error) | |
340 | return error; | |
341 | if (!nfsi->npages) { | |
342 | igrab(inode); | |
343 | nfs_begin_data_update(inode); | |
344 | if (nfs_have_delegation(inode, FMODE_WRITE)) | |
345 | nfsi->change_attr++; | |
346 | } | |
deb7d638 | 347 | SetPagePrivate(req->wb_page); |
277459d2 | 348 | set_page_private(req->wb_page, (unsigned long)req); |
1da177e4 LT |
349 | nfsi->npages++; |
350 | atomic_inc(&req->wb_count); | |
351 | return 0; | |
352 | } | |
353 | ||
354 | /* | |
355 | * Insert a write request into an inode | |
356 | */ | |
357 | static void nfs_inode_remove_request(struct nfs_page *req) | |
358 | { | |
359 | struct inode *inode = req->wb_context->dentry->d_inode; | |
360 | struct nfs_inode *nfsi = NFS_I(inode); | |
361 | ||
362 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
363 | ||
364 | spin_lock(&nfsi->req_lock); | |
277459d2 | 365 | set_page_private(req->wb_page, 0); |
deb7d638 | 366 | ClearPagePrivate(req->wb_page); |
1da177e4 LT |
367 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
368 | nfsi->npages--; | |
369 | if (!nfsi->npages) { | |
370 | spin_unlock(&nfsi->req_lock); | |
951a143b | 371 | nfs_end_data_update(inode); |
1da177e4 LT |
372 | iput(inode); |
373 | } else | |
374 | spin_unlock(&nfsi->req_lock); | |
375 | nfs_clear_request(req); | |
376 | nfs_release_request(req); | |
377 | } | |
378 | ||
1da177e4 LT |
379 | /* |
380 | * Add a request to the inode's dirty list. | |
381 | */ | |
382 | static void | |
383 | nfs_mark_request_dirty(struct nfs_page *req) | |
384 | { | |
385 | struct inode *inode = req->wb_context->dentry->d_inode; | |
386 | struct nfs_inode *nfsi = NFS_I(inode); | |
387 | ||
388 | spin_lock(&nfsi->req_lock); | |
3da28eb1 TM |
389 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
390 | req->wb_index, NFS_PAGE_TAG_DIRTY); | |
1da177e4 LT |
391 | nfs_list_add_request(req, &nfsi->dirty); |
392 | nfsi->ndirty++; | |
393 | spin_unlock(&nfsi->req_lock); | |
b1e7a8fd | 394 | inc_zone_page_state(req->wb_page, NR_FILE_DIRTY); |
1da177e4 LT |
395 | mark_inode_dirty(inode); |
396 | } | |
397 | ||
398 | /* | |
399 | * Check if a request is dirty | |
400 | */ | |
401 | static inline int | |
402 | nfs_dirty_request(struct nfs_page *req) | |
403 | { | |
404 | struct nfs_inode *nfsi = NFS_I(req->wb_context->dentry->d_inode); | |
405 | return !list_empty(&req->wb_list) && req->wb_list_head == &nfsi->dirty; | |
406 | } | |
407 | ||
408 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
409 | /* | |
410 | * Add a request to the inode's commit list. | |
411 | */ | |
412 | static void | |
413 | nfs_mark_request_commit(struct nfs_page *req) | |
414 | { | |
415 | struct inode *inode = req->wb_context->dentry->d_inode; | |
416 | struct nfs_inode *nfsi = NFS_I(inode); | |
417 | ||
418 | spin_lock(&nfsi->req_lock); | |
419 | nfs_list_add_request(req, &nfsi->commit); | |
420 | nfsi->ncommit++; | |
421 | spin_unlock(&nfsi->req_lock); | |
fd39fc85 | 422 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
1da177e4 LT |
423 | mark_inode_dirty(inode); |
424 | } | |
425 | #endif | |
426 | ||
427 | /* | |
428 | * Wait for a request to complete. | |
429 | * | |
430 | * Interruptible by signals only if mounted with intr flag. | |
431 | */ | |
c42de9dd | 432 | static int nfs_wait_on_requests_locked(struct inode *inode, unsigned long idx_start, unsigned int npages) |
1da177e4 LT |
433 | { |
434 | struct nfs_inode *nfsi = NFS_I(inode); | |
435 | struct nfs_page *req; | |
436 | unsigned long idx_end, next; | |
437 | unsigned int res = 0; | |
438 | int error; | |
439 | ||
440 | if (npages == 0) | |
441 | idx_end = ~0; | |
442 | else | |
443 | idx_end = idx_start + npages - 1; | |
444 | ||
1da177e4 | 445 | next = idx_start; |
c6a556b8 | 446 | while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_WRITEBACK)) { |
1da177e4 LT |
447 | if (req->wb_index > idx_end) |
448 | break; | |
449 | ||
450 | next = req->wb_index + 1; | |
c6a556b8 | 451 | BUG_ON(!NFS_WBACK_BUSY(req)); |
1da177e4 LT |
452 | |
453 | atomic_inc(&req->wb_count); | |
454 | spin_unlock(&nfsi->req_lock); | |
455 | error = nfs_wait_on_request(req); | |
456 | nfs_release_request(req); | |
c42de9dd | 457 | spin_lock(&nfsi->req_lock); |
1da177e4 LT |
458 | if (error < 0) |
459 | return error; | |
1da177e4 LT |
460 | res++; |
461 | } | |
1da177e4 LT |
462 | return res; |
463 | } | |
464 | ||
c42de9dd TM |
465 | static int nfs_wait_on_requests(struct inode *inode, unsigned long idx_start, unsigned int npages) |
466 | { | |
467 | struct nfs_inode *nfsi = NFS_I(inode); | |
468 | int ret; | |
469 | ||
470 | spin_lock(&nfsi->req_lock); | |
471 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); | |
472 | spin_unlock(&nfsi->req_lock); | |
473 | return ret; | |
474 | } | |
475 | ||
83715ad5 | 476 | static void nfs_cancel_dirty_list(struct list_head *head) |
d2ccddf0 TM |
477 | { |
478 | struct nfs_page *req; | |
479 | while(!list_empty(head)) { | |
480 | req = nfs_list_entry(head->next); | |
481 | nfs_list_remove_request(req); | |
482 | nfs_inode_remove_request(req); | |
483 | nfs_clear_page_writeback(req); | |
484 | } | |
485 | } | |
486 | ||
83715ad5 TM |
487 | static void nfs_cancel_commit_list(struct list_head *head) |
488 | { | |
489 | struct nfs_page *req; | |
490 | ||
491 | while(!list_empty(head)) { | |
492 | req = nfs_list_entry(head->next); | |
b6dff26a | 493 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
83715ad5 TM |
494 | nfs_list_remove_request(req); |
495 | nfs_inode_remove_request(req); | |
b6dff26a | 496 | nfs_unlock_request(req); |
83715ad5 TM |
497 | } |
498 | } | |
499 | ||
1da177e4 LT |
500 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
501 | /* | |
502 | * nfs_scan_commit - Scan an inode for commit requests | |
503 | * @inode: NFS inode to scan | |
504 | * @dst: destination list | |
505 | * @idx_start: lower bound of page->index to scan. | |
506 | * @npages: idx_start + npages sets the upper bound to scan. | |
507 | * | |
508 | * Moves requests from the inode's 'commit' request list. | |
509 | * The requests are *not* checked to ensure that they form a contiguous set. | |
510 | */ | |
511 | static int | |
512 | nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
513 | { | |
514 | struct nfs_inode *nfsi = NFS_I(inode); | |
3da28eb1 TM |
515 | int res = 0; |
516 | ||
517 | if (nfsi->ncommit != 0) { | |
d2ccddf0 | 518 | res = nfs_scan_list(nfsi, &nfsi->commit, dst, idx_start, npages); |
3da28eb1 TM |
519 | nfsi->ncommit -= res; |
520 | if ((nfsi->ncommit == 0) != list_empty(&nfsi->commit)) | |
521 | printk(KERN_ERR "NFS: desynchronized value of nfs_i.ncommit.\n"); | |
522 | } | |
1da177e4 LT |
523 | return res; |
524 | } | |
c42de9dd TM |
525 | #else |
526 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
527 | { | |
528 | return 0; | |
529 | } | |
1da177e4 LT |
530 | #endif |
531 | ||
532 | static int nfs_wait_on_write_congestion(struct address_space *mapping, int intr) | |
533 | { | |
534 | struct backing_dev_info *bdi = mapping->backing_dev_info; | |
535 | DEFINE_WAIT(wait); | |
536 | int ret = 0; | |
537 | ||
538 | might_sleep(); | |
539 | ||
540 | if (!bdi_write_congested(bdi)) | |
541 | return 0; | |
91d5b470 CL |
542 | |
543 | nfs_inc_stats(mapping->host, NFSIOS_CONGESTIONWAIT); | |
544 | ||
1da177e4 LT |
545 | if (intr) { |
546 | struct rpc_clnt *clnt = NFS_CLIENT(mapping->host); | |
547 | sigset_t oldset; | |
548 | ||
549 | rpc_clnt_sigmask(clnt, &oldset); | |
550 | prepare_to_wait(&nfs_write_congestion, &wait, TASK_INTERRUPTIBLE); | |
551 | if (bdi_write_congested(bdi)) { | |
552 | if (signalled()) | |
553 | ret = -ERESTARTSYS; | |
554 | else | |
555 | schedule(); | |
556 | } | |
557 | rpc_clnt_sigunmask(clnt, &oldset); | |
558 | } else { | |
559 | prepare_to_wait(&nfs_write_congestion, &wait, TASK_UNINTERRUPTIBLE); | |
560 | if (bdi_write_congested(bdi)) | |
561 | schedule(); | |
562 | } | |
563 | finish_wait(&nfs_write_congestion, &wait); | |
564 | return ret; | |
565 | } | |
566 | ||
567 | ||
568 | /* | |
569 | * Try to update any existing write request, or create one if there is none. | |
570 | * In order to match, the request's credentials must match those of | |
571 | * the calling process. | |
572 | * | |
573 | * Note: Should always be called with the Page Lock held! | |
574 | */ | |
575 | static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, | |
e21195a7 | 576 | struct page *page, unsigned int offset, unsigned int bytes) |
1da177e4 | 577 | { |
e21195a7 | 578 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
579 | struct nfs_inode *nfsi = NFS_I(inode); |
580 | struct nfs_page *req, *new = NULL; | |
581 | unsigned long rqend, end; | |
582 | ||
583 | end = offset + bytes; | |
584 | ||
e21195a7 | 585 | if (nfs_wait_on_write_congestion(page->mapping, NFS_SERVER(inode)->flags & NFS_MOUNT_INTR)) |
1da177e4 LT |
586 | return ERR_PTR(-ERESTARTSYS); |
587 | for (;;) { | |
588 | /* Loop over all inode entries and see if we find | |
589 | * A request for the page we wish to update | |
590 | */ | |
591 | spin_lock(&nfsi->req_lock); | |
277459d2 | 592 | req = nfs_page_find_request_locked(page); |
1da177e4 LT |
593 | if (req) { |
594 | if (!nfs_lock_request_dontget(req)) { | |
595 | int error; | |
277459d2 | 596 | |
1da177e4 LT |
597 | spin_unlock(&nfsi->req_lock); |
598 | error = nfs_wait_on_request(req); | |
599 | nfs_release_request(req); | |
1dd594b2 NB |
600 | if (error < 0) { |
601 | if (new) | |
602 | nfs_release_request(new); | |
1da177e4 | 603 | return ERR_PTR(error); |
1dd594b2 | 604 | } |
1da177e4 LT |
605 | continue; |
606 | } | |
607 | spin_unlock(&nfsi->req_lock); | |
608 | if (new) | |
609 | nfs_release_request(new); | |
610 | break; | |
611 | } | |
612 | ||
613 | if (new) { | |
614 | int error; | |
615 | nfs_lock_request_dontget(new); | |
616 | error = nfs_inode_add_request(inode, new); | |
617 | if (error) { | |
618 | spin_unlock(&nfsi->req_lock); | |
619 | nfs_unlock_request(new); | |
620 | return ERR_PTR(error); | |
621 | } | |
622 | spin_unlock(&nfsi->req_lock); | |
623 | nfs_mark_request_dirty(new); | |
624 | return new; | |
625 | } | |
626 | spin_unlock(&nfsi->req_lock); | |
627 | ||
628 | new = nfs_create_request(ctx, inode, page, offset, bytes); | |
629 | if (IS_ERR(new)) | |
630 | return new; | |
631 | } | |
632 | ||
633 | /* We have a request for our page. | |
634 | * If the creds don't match, or the | |
635 | * page addresses don't match, | |
636 | * tell the caller to wait on the conflicting | |
637 | * request. | |
638 | */ | |
639 | rqend = req->wb_offset + req->wb_bytes; | |
640 | if (req->wb_context != ctx | |
641 | || req->wb_page != page | |
642 | || !nfs_dirty_request(req) | |
643 | || offset > rqend || end < req->wb_offset) { | |
644 | nfs_unlock_request(req); | |
645 | return ERR_PTR(-EBUSY); | |
646 | } | |
647 | ||
648 | /* Okay, the request matches. Update the region */ | |
649 | if (offset < req->wb_offset) { | |
650 | req->wb_offset = offset; | |
651 | req->wb_pgbase = offset; | |
652 | req->wb_bytes = rqend - req->wb_offset; | |
653 | } | |
654 | ||
655 | if (end > rqend) | |
656 | req->wb_bytes = end - req->wb_offset; | |
657 | ||
658 | return req; | |
659 | } | |
660 | ||
661 | int nfs_flush_incompatible(struct file *file, struct page *page) | |
662 | { | |
663 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 | 664 | struct nfs_page *req; |
1a54533e | 665 | int do_flush, status; |
1da177e4 LT |
666 | /* |
667 | * Look for a request corresponding to this page. If there | |
668 | * is one, and it belongs to another file, we flush it out | |
669 | * before we try to copy anything into the page. Do this | |
670 | * due to the lack of an ACCESS-type call in NFSv2. | |
671 | * Also do the same if we find a request from an existing | |
672 | * dropped page. | |
673 | */ | |
1a54533e TM |
674 | do { |
675 | req = nfs_page_find_request(page); | |
676 | if (req == NULL) | |
677 | return 0; | |
678 | do_flush = req->wb_page != page || req->wb_context != ctx | |
679 | || test_bit(PG_NEED_FLUSH, &req->wb_flags); | |
1da177e4 | 680 | nfs_release_request(req); |
1a54533e TM |
681 | if (!do_flush) |
682 | return 0; | |
683 | status = nfs_wb_page(page->mapping->host, page); | |
684 | } while (status == 0); | |
685 | return status; | |
1da177e4 LT |
686 | } |
687 | ||
688 | /* | |
689 | * Update and possibly write a cached page of an NFS file. | |
690 | * | |
691 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
692 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
693 | */ | |
694 | int nfs_updatepage(struct file *file, struct page *page, | |
695 | unsigned int offset, unsigned int count) | |
696 | { | |
697 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 | 698 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
699 | int status = 0; |
700 | ||
91d5b470 CL |
701 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
702 | ||
1da177e4 | 703 | dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", |
0bbacc40 CL |
704 | file->f_dentry->d_parent->d_name.name, |
705 | file->f_dentry->d_name.name, count, | |
706 | (long long)(page_offset(page) +offset)); | |
1da177e4 | 707 | |
1da177e4 LT |
708 | /* If we're not using byte range locks, and we know the page |
709 | * is entirely in cache, it may be more efficient to avoid | |
710 | * fragmenting write requests. | |
711 | */ | |
ab0a3dbe | 712 | if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) { |
49a70f27 | 713 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 714 | offset = 0; |
1da177e4 LT |
715 | } |
716 | ||
e21195a7 | 717 | status = nfs_writepage_setup(ctx, page, offset, count); |
1da177e4 | 718 | |
1da177e4 LT |
719 | dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", |
720 | status, (long long)i_size_read(inode)); | |
721 | if (status < 0) | |
722 | ClearPageUptodate(page); | |
723 | return status; | |
724 | } | |
725 | ||
726 | static void nfs_writepage_release(struct nfs_page *req) | |
727 | { | |
728 | end_page_writeback(req->wb_page); | |
729 | ||
730 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
731 | if (!PageError(req->wb_page)) { | |
732 | if (NFS_NEED_RESCHED(req)) { | |
733 | nfs_mark_request_dirty(req); | |
734 | goto out; | |
735 | } else if (NFS_NEED_COMMIT(req)) { | |
736 | nfs_mark_request_commit(req); | |
737 | goto out; | |
738 | } | |
739 | } | |
740 | nfs_inode_remove_request(req); | |
741 | ||
742 | out: | |
743 | nfs_clear_commit(req); | |
744 | nfs_clear_reschedule(req); | |
745 | #else | |
746 | nfs_inode_remove_request(req); | |
747 | #endif | |
c6a556b8 | 748 | nfs_clear_page_writeback(req); |
1da177e4 LT |
749 | } |
750 | ||
751 | static inline int flush_task_priority(int how) | |
752 | { | |
753 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
754 | case FLUSH_HIGHPRI: | |
755 | return RPC_PRIORITY_HIGH; | |
756 | case FLUSH_LOWPRI: | |
757 | return RPC_PRIORITY_LOW; | |
758 | } | |
759 | return RPC_PRIORITY_NORMAL; | |
760 | } | |
761 | ||
762 | /* | |
763 | * Set up the argument/result storage required for the RPC call. | |
764 | */ | |
765 | static void nfs_write_rpcsetup(struct nfs_page *req, | |
766 | struct nfs_write_data *data, | |
788e7a89 | 767 | const struct rpc_call_ops *call_ops, |
1da177e4 LT |
768 | unsigned int count, unsigned int offset, |
769 | int how) | |
770 | { | |
1da177e4 | 771 | struct inode *inode; |
788e7a89 | 772 | int flags; |
1da177e4 LT |
773 | |
774 | /* Set up the RPC argument and reply structs | |
775 | * NB: take care not to mess about with data->commit et al. */ | |
776 | ||
777 | data->req = req; | |
778 | data->inode = inode = req->wb_context->dentry->d_inode; | |
779 | data->cred = req->wb_context->cred; | |
780 | ||
781 | data->args.fh = NFS_FH(inode); | |
782 | data->args.offset = req_offset(req) + offset; | |
783 | data->args.pgbase = req->wb_pgbase + offset; | |
784 | data->args.pages = data->pagevec; | |
785 | data->args.count = count; | |
786 | data->args.context = req->wb_context; | |
787 | ||
788 | data->res.fattr = &data->fattr; | |
789 | data->res.count = count; | |
790 | data->res.verf = &data->verf; | |
0e574af1 | 791 | nfs_fattr_init(&data->fattr); |
1da177e4 | 792 | |
788e7a89 TM |
793 | /* Set up the initial task struct. */ |
794 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
795 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data); | |
1da177e4 LT |
796 | NFS_PROTO(inode)->write_setup(data, how); |
797 | ||
798 | data->task.tk_priority = flush_task_priority(how); | |
799 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 LT |
800 | |
801 | dprintk("NFS: %4d initiated write call (req %s/%Ld, %u bytes @ offset %Lu)\n", | |
0bbacc40 | 802 | data->task.tk_pid, |
1da177e4 LT |
803 | inode->i_sb->s_id, |
804 | (long long)NFS_FILEID(inode), | |
805 | count, | |
806 | (unsigned long long)data->args.offset); | |
807 | } | |
808 | ||
809 | static void nfs_execute_write(struct nfs_write_data *data) | |
810 | { | |
811 | struct rpc_clnt *clnt = NFS_CLIENT(data->inode); | |
812 | sigset_t oldset; | |
813 | ||
814 | rpc_clnt_sigmask(clnt, &oldset); | |
1da177e4 | 815 | rpc_execute(&data->task); |
1da177e4 LT |
816 | rpc_clnt_sigunmask(clnt, &oldset); |
817 | } | |
818 | ||
819 | /* | |
820 | * Generate multiple small requests to write out a single | |
821 | * contiguous dirty area on one page. | |
822 | */ | |
7d46a49f | 823 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
824 | { |
825 | struct nfs_page *req = nfs_list_entry(head->next); | |
826 | struct page *page = req->wb_page; | |
827 | struct nfs_write_data *data; | |
e9f7bee1 TM |
828 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
829 | unsigned int offset; | |
1da177e4 LT |
830 | int requests = 0; |
831 | LIST_HEAD(list); | |
832 | ||
833 | nfs_list_remove_request(req); | |
834 | ||
835 | nbytes = req->wb_bytes; | |
e9f7bee1 TM |
836 | do { |
837 | size_t len = min(nbytes, wsize); | |
838 | ||
839 | data = nfs_writedata_alloc(len); | |
1da177e4 LT |
840 | if (!data) |
841 | goto out_bad; | |
842 | list_add(&data->pages, &list); | |
843 | requests++; | |
e9f7bee1 TM |
844 | nbytes -= len; |
845 | } while (nbytes != 0); | |
1da177e4 LT |
846 | atomic_set(&req->wb_complete, requests); |
847 | ||
848 | ClearPageError(page); | |
bb713d6d | 849 | set_page_writeback(page); |
1da177e4 LT |
850 | offset = 0; |
851 | nbytes = req->wb_bytes; | |
852 | do { | |
853 | data = list_entry(list.next, struct nfs_write_data, pages); | |
854 | list_del_init(&data->pages); | |
855 | ||
856 | data->pagevec[0] = page; | |
1da177e4 LT |
857 | |
858 | if (nbytes > wsize) { | |
788e7a89 TM |
859 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
860 | wsize, offset, how); | |
1da177e4 LT |
861 | offset += wsize; |
862 | nbytes -= wsize; | |
863 | } else { | |
788e7a89 TM |
864 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
865 | nbytes, offset, how); | |
1da177e4 LT |
866 | nbytes = 0; |
867 | } | |
868 | nfs_execute_write(data); | |
869 | } while (nbytes != 0); | |
870 | ||
871 | return 0; | |
872 | ||
873 | out_bad: | |
874 | while (!list_empty(&list)) { | |
875 | data = list_entry(list.next, struct nfs_write_data, pages); | |
876 | list_del(&data->pages); | |
8aca67f0 | 877 | nfs_writedata_release(data); |
1da177e4 LT |
878 | } |
879 | nfs_mark_request_dirty(req); | |
c6a556b8 | 880 | nfs_clear_page_writeback(req); |
1da177e4 LT |
881 | return -ENOMEM; |
882 | } | |
883 | ||
884 | /* | |
885 | * Create an RPC task for the given write request and kick it. | |
886 | * The page must have been locked by the caller. | |
887 | * | |
888 | * It may happen that the page we're passed is not marked dirty. | |
889 | * This is the case if nfs_updatepage detects a conflicting request | |
890 | * that has been written but not committed. | |
891 | */ | |
7d46a49f | 892 | static int nfs_flush_one(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
893 | { |
894 | struct nfs_page *req; | |
895 | struct page **pages; | |
896 | struct nfs_write_data *data; | |
897 | unsigned int count; | |
898 | ||
e9f7bee1 | 899 | data = nfs_writedata_alloc(NFS_SERVER(inode)->wsize); |
1da177e4 LT |
900 | if (!data) |
901 | goto out_bad; | |
902 | ||
903 | pages = data->pagevec; | |
904 | count = 0; | |
905 | while (!list_empty(head)) { | |
906 | req = nfs_list_entry(head->next); | |
907 | nfs_list_remove_request(req); | |
908 | nfs_list_add_request(req, &data->pages); | |
909 | ClearPageError(req->wb_page); | |
bb713d6d | 910 | set_page_writeback(req->wb_page); |
1da177e4 LT |
911 | *pages++ = req->wb_page; |
912 | count += req->wb_bytes; | |
913 | } | |
914 | req = nfs_list_entry(data->pages.next); | |
915 | ||
1da177e4 | 916 | /* Set up the argument struct */ |
788e7a89 | 917 | nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 LT |
918 | |
919 | nfs_execute_write(data); | |
920 | return 0; | |
921 | out_bad: | |
922 | while (!list_empty(head)) { | |
923 | struct nfs_page *req = nfs_list_entry(head->next); | |
924 | nfs_list_remove_request(req); | |
925 | nfs_mark_request_dirty(req); | |
c6a556b8 | 926 | nfs_clear_page_writeback(req); |
1da177e4 LT |
927 | } |
928 | return -ENOMEM; | |
929 | } | |
930 | ||
7d46a49f | 931 | static int nfs_flush_list(struct inode *inode, struct list_head *head, int npages, int how) |
1da177e4 LT |
932 | { |
933 | LIST_HEAD(one_request); | |
7d46a49f TM |
934 | int (*flush_one)(struct inode *, struct list_head *, int); |
935 | struct nfs_page *req; | |
936 | int wpages = NFS_SERVER(inode)->wpages; | |
937 | int wsize = NFS_SERVER(inode)->wsize; | |
938 | int error; | |
1da177e4 | 939 | |
7d46a49f TM |
940 | flush_one = nfs_flush_one; |
941 | if (wsize < PAGE_CACHE_SIZE) | |
942 | flush_one = nfs_flush_multi; | |
943 | /* For single writes, FLUSH_STABLE is more efficient */ | |
944 | if (npages <= wpages && npages == NFS_I(inode)->npages | |
945 | && nfs_list_entry(head->next)->wb_bytes <= wsize) | |
946 | how |= FLUSH_STABLE; | |
947 | ||
948 | do { | |
949 | nfs_coalesce_requests(head, &one_request, wpages); | |
1da177e4 | 950 | req = nfs_list_entry(one_request.next); |
7d46a49f | 951 | error = flush_one(inode, &one_request, how); |
1da177e4 | 952 | if (error < 0) |
7d46a49f TM |
953 | goto out_err; |
954 | } while (!list_empty(head)); | |
955 | return 0; | |
956 | out_err: | |
1da177e4 LT |
957 | while (!list_empty(head)) { |
958 | req = nfs_list_entry(head->next); | |
959 | nfs_list_remove_request(req); | |
960 | nfs_mark_request_dirty(req); | |
c6a556b8 | 961 | nfs_clear_page_writeback(req); |
1da177e4 LT |
962 | } |
963 | return error; | |
964 | } | |
965 | ||
966 | /* | |
967 | * Handle a write reply that flushed part of a page. | |
968 | */ | |
788e7a89 | 969 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 970 | { |
788e7a89 | 971 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
972 | struct nfs_page *req = data->req; |
973 | struct page *page = req->wb_page; | |
974 | ||
975 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
976 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
977 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
978 | req->wb_bytes, | |
979 | (long long)req_offset(req)); | |
980 | ||
788e7a89 TM |
981 | if (nfs_writeback_done(task, data) != 0) |
982 | return; | |
983 | ||
984 | if (task->tk_status < 0) { | |
1da177e4 LT |
985 | ClearPageUptodate(page); |
986 | SetPageError(page); | |
788e7a89 TM |
987 | req->wb_context->error = task->tk_status; |
988 | dprintk(", error = %d\n", task->tk_status); | |
1da177e4 LT |
989 | } else { |
990 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
991 | if (data->verf.committed < NFS_FILE_SYNC) { | |
992 | if (!NFS_NEED_COMMIT(req)) { | |
993 | nfs_defer_commit(req); | |
994 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
995 | dprintk(" defer commit\n"); | |
996 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
997 | nfs_defer_reschedule(req); | |
998 | dprintk(" server reboot detected\n"); | |
999 | } | |
1000 | } else | |
1001 | #endif | |
1002 | dprintk(" OK\n"); | |
1003 | } | |
1004 | ||
1005 | if (atomic_dec_and_test(&req->wb_complete)) | |
1006 | nfs_writepage_release(req); | |
1007 | } | |
1008 | ||
788e7a89 TM |
1009 | static const struct rpc_call_ops nfs_write_partial_ops = { |
1010 | .rpc_call_done = nfs_writeback_done_partial, | |
1011 | .rpc_release = nfs_writedata_release, | |
1012 | }; | |
1013 | ||
1da177e4 LT |
1014 | /* |
1015 | * Handle a write reply that flushes a whole page. | |
1016 | * | |
1017 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
1018 | * writebacks since the page->count is kept > 1 for as long | |
1019 | * as the page has a write request pending. | |
1020 | */ | |
788e7a89 | 1021 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 1022 | { |
788e7a89 | 1023 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
1024 | struct nfs_page *req; |
1025 | struct page *page; | |
1026 | ||
788e7a89 TM |
1027 | if (nfs_writeback_done(task, data) != 0) |
1028 | return; | |
1029 | ||
1da177e4 LT |
1030 | /* Update attributes as result of writeback. */ |
1031 | while (!list_empty(&data->pages)) { | |
1032 | req = nfs_list_entry(data->pages.next); | |
1033 | nfs_list_remove_request(req); | |
1034 | page = req->wb_page; | |
1035 | ||
1036 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
1037 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1038 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1039 | req->wb_bytes, | |
1040 | (long long)req_offset(req)); | |
1041 | ||
788e7a89 | 1042 | if (task->tk_status < 0) { |
1da177e4 LT |
1043 | ClearPageUptodate(page); |
1044 | SetPageError(page); | |
788e7a89 | 1045 | req->wb_context->error = task->tk_status; |
1da177e4 LT |
1046 | end_page_writeback(page); |
1047 | nfs_inode_remove_request(req); | |
788e7a89 | 1048 | dprintk(", error = %d\n", task->tk_status); |
1da177e4 LT |
1049 | goto next; |
1050 | } | |
1051 | end_page_writeback(page); | |
1052 | ||
1053 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
1054 | if (data->args.stable != NFS_UNSTABLE || data->verf.committed == NFS_FILE_SYNC) { | |
1055 | nfs_inode_remove_request(req); | |
1056 | dprintk(" OK\n"); | |
1057 | goto next; | |
1058 | } | |
1059 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1060 | nfs_mark_request_commit(req); | |
1061 | dprintk(" marked for commit\n"); | |
1062 | #else | |
1063 | nfs_inode_remove_request(req); | |
1064 | #endif | |
1065 | next: | |
c6a556b8 | 1066 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1067 | } |
1068 | } | |
1069 | ||
788e7a89 TM |
1070 | static const struct rpc_call_ops nfs_write_full_ops = { |
1071 | .rpc_call_done = nfs_writeback_done_full, | |
1072 | .rpc_release = nfs_writedata_release, | |
1073 | }; | |
1074 | ||
1075 | ||
1da177e4 LT |
1076 | /* |
1077 | * This function is called when the WRITE call is complete. | |
1078 | */ | |
462d5b32 | 1079 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1080 | { |
1da177e4 LT |
1081 | struct nfs_writeargs *argp = &data->args; |
1082 | struct nfs_writeres *resp = &data->res; | |
788e7a89 | 1083 | int status; |
1da177e4 LT |
1084 | |
1085 | dprintk("NFS: %4d nfs_writeback_done (status %d)\n", | |
1086 | task->tk_pid, task->tk_status); | |
1087 | ||
f551e44f CL |
1088 | /* |
1089 | * ->write_done will attempt to use post-op attributes to detect | |
1090 | * conflicting writes by other clients. A strict interpretation | |
1091 | * of close-to-open would allow us to continue caching even if | |
1092 | * another writer had changed the file, but some applications | |
1093 | * depend on tighter cache coherency when writing. | |
1094 | */ | |
788e7a89 TM |
1095 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1096 | if (status != 0) | |
1097 | return status; | |
91d5b470 CL |
1098 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1099 | ||
1da177e4 LT |
1100 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1101 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1102 | /* We tried a write call, but the server did not | |
1103 | * commit data to stable storage even though we | |
1104 | * requested it. | |
1105 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1106 | * the server reports NFS_DATA_SYNC, but performs | |
1107 | * NFS_FILE_SYNC. We therefore implement this checking | |
1108 | * as a dprintk() in order to avoid filling syslog. | |
1109 | */ | |
1110 | static unsigned long complain; | |
1111 | ||
1112 | if (time_before(complain, jiffies)) { | |
1113 | dprintk("NFS: faulty NFS server %s:" | |
1114 | " (committed = %d) != (stable = %d)\n", | |
54ceac45 | 1115 | NFS_SERVER(data->inode)->nfs_client->cl_hostname, |
1da177e4 LT |
1116 | resp->verf->committed, argp->stable); |
1117 | complain = jiffies + 300 * HZ; | |
1118 | } | |
1119 | } | |
1120 | #endif | |
1121 | /* Is this a short write? */ | |
1122 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1123 | static unsigned long complain; | |
1124 | ||
91d5b470 CL |
1125 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1126 | ||
1da177e4 LT |
1127 | /* Has the server at least made some progress? */ |
1128 | if (resp->count != 0) { | |
1129 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1130 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1131 | /* Resend from where the server left off */ | |
1132 | argp->offset += resp->count; | |
1133 | argp->pgbase += resp->count; | |
1134 | argp->count -= resp->count; | |
1135 | } else { | |
1136 | /* Resend as a stable write in order to avoid | |
1137 | * headaches in the case of a server crash. | |
1138 | */ | |
1139 | argp->stable = NFS_FILE_SYNC; | |
1140 | } | |
1141 | rpc_restart_call(task); | |
788e7a89 | 1142 | return -EAGAIN; |
1da177e4 LT |
1143 | } |
1144 | if (time_before(complain, jiffies)) { | |
1145 | printk(KERN_WARNING | |
1146 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1147 | argp->count); | |
1148 | complain = jiffies + 300 * HZ; | |
1149 | } | |
1150 | /* Can't do anything about it except throw an error. */ | |
1151 | task->tk_status = -EIO; | |
1152 | } | |
788e7a89 | 1153 | return 0; |
1da177e4 LT |
1154 | } |
1155 | ||
1156 | ||
1157 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
963d8fe5 | 1158 | void nfs_commit_release(void *wdata) |
1da177e4 | 1159 | { |
1da177e4 LT |
1160 | nfs_commit_free(wdata); |
1161 | } | |
1162 | ||
1163 | /* | |
1164 | * Set up the argument/result storage required for the RPC call. | |
1165 | */ | |
1166 | static void nfs_commit_rpcsetup(struct list_head *head, | |
788e7a89 TM |
1167 | struct nfs_write_data *data, |
1168 | int how) | |
1da177e4 | 1169 | { |
3da28eb1 | 1170 | struct nfs_page *first; |
1da177e4 | 1171 | struct inode *inode; |
788e7a89 | 1172 | int flags; |
1da177e4 LT |
1173 | |
1174 | /* Set up the RPC argument and reply structs | |
1175 | * NB: take care not to mess about with data->commit et al. */ | |
1176 | ||
1177 | list_splice_init(head, &data->pages); | |
1178 | first = nfs_list_entry(data->pages.next); | |
1da177e4 LT |
1179 | inode = first->wb_context->dentry->d_inode; |
1180 | ||
1da177e4 LT |
1181 | data->inode = inode; |
1182 | data->cred = first->wb_context->cred; | |
1183 | ||
1184 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1185 | /* Note: we always request a commit of the entire inode */ |
1186 | data->args.offset = 0; | |
1187 | data->args.count = 0; | |
1188 | data->res.count = 0; | |
1da177e4 LT |
1189 | data->res.fattr = &data->fattr; |
1190 | data->res.verf = &data->verf; | |
0e574af1 | 1191 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1192 | |
1193 | /* Set up the initial task struct. */ | |
1194 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
1195 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data); | |
1da177e4 LT |
1196 | NFS_PROTO(inode)->commit_setup(data, how); |
1197 | ||
1198 | data->task.tk_priority = flush_task_priority(how); | |
1199 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 1200 | |
0bbacc40 | 1201 | dprintk("NFS: %4d initiated commit call\n", data->task.tk_pid); |
1da177e4 LT |
1202 | } |
1203 | ||
1204 | /* | |
1205 | * Commit dirty pages | |
1206 | */ | |
1207 | static int | |
40859d7e | 1208 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1209 | { |
1210 | struct nfs_write_data *data; | |
1211 | struct nfs_page *req; | |
1212 | ||
e9f7bee1 | 1213 | data = nfs_commit_alloc(); |
1da177e4 LT |
1214 | |
1215 | if (!data) | |
1216 | goto out_bad; | |
1217 | ||
1218 | /* Set up the argument struct */ | |
1219 | nfs_commit_rpcsetup(head, data, how); | |
1220 | ||
1221 | nfs_execute_write(data); | |
1222 | return 0; | |
1223 | out_bad: | |
1224 | while (!list_empty(head)) { | |
1225 | req = nfs_list_entry(head->next); | |
1226 | nfs_list_remove_request(req); | |
1227 | nfs_mark_request_commit(req); | |
83715ad5 | 1228 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
5c2d97cb | 1229 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1230 | } |
1231 | return -ENOMEM; | |
1232 | } | |
1233 | ||
1234 | /* | |
1235 | * COMMIT call returned | |
1236 | */ | |
788e7a89 | 1237 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1238 | { |
963d8fe5 | 1239 | struct nfs_write_data *data = calldata; |
1da177e4 | 1240 | struct nfs_page *req; |
1da177e4 LT |
1241 | |
1242 | dprintk("NFS: %4d nfs_commit_done (status %d)\n", | |
1243 | task->tk_pid, task->tk_status); | |
1244 | ||
788e7a89 TM |
1245 | /* Call the NFS version-specific code */ |
1246 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1247 | return; | |
1248 | ||
1da177e4 LT |
1249 | while (!list_empty(&data->pages)) { |
1250 | req = nfs_list_entry(data->pages.next); | |
1251 | nfs_list_remove_request(req); | |
fd39fc85 | 1252 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
1da177e4 LT |
1253 | |
1254 | dprintk("NFS: commit (%s/%Ld %d@%Ld)", | |
1255 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1256 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1257 | req->wb_bytes, | |
1258 | (long long)req_offset(req)); | |
1259 | if (task->tk_status < 0) { | |
1260 | req->wb_context->error = task->tk_status; | |
1261 | nfs_inode_remove_request(req); | |
1262 | dprintk(", error = %d\n", task->tk_status); | |
1263 | goto next; | |
1264 | } | |
1265 | ||
1266 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1267 | * returned by the server against all stored verfs. */ | |
1268 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1269 | /* We have a match */ | |
1270 | nfs_inode_remove_request(req); | |
1271 | dprintk(" OK\n"); | |
1272 | goto next; | |
1273 | } | |
1274 | /* We have a mismatch. Write the page again */ | |
1275 | dprintk(" mismatch\n"); | |
1276 | nfs_mark_request_dirty(req); | |
1277 | next: | |
c6a556b8 | 1278 | nfs_clear_page_writeback(req); |
1da177e4 | 1279 | } |
1da177e4 | 1280 | } |
788e7a89 TM |
1281 | |
1282 | static const struct rpc_call_ops nfs_commit_ops = { | |
1283 | .rpc_call_done = nfs_commit_done, | |
1284 | .rpc_release = nfs_commit_release, | |
1285 | }; | |
c42de9dd TM |
1286 | #else |
1287 | static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) | |
1288 | { | |
1289 | return 0; | |
1290 | } | |
1da177e4 LT |
1291 | #endif |
1292 | ||
3f442547 | 1293 | static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1294 | { |
28c6925f | 1295 | struct nfs_inode *nfsi = NFS_I(mapping->host); |
1da177e4 | 1296 | LIST_HEAD(head); |
3f442547 | 1297 | long res; |
1da177e4 LT |
1298 | |
1299 | spin_lock(&nfsi->req_lock); | |
3f442547 | 1300 | res = nfs_scan_dirty(mapping, wbc, &head); |
1da177e4 | 1301 | spin_unlock(&nfsi->req_lock); |
ab0a3dbe | 1302 | if (res) { |
28c6925f | 1303 | int error = nfs_flush_list(mapping->host, &head, res, how); |
7d46a49f TM |
1304 | if (error < 0) |
1305 | return error; | |
ab0a3dbe | 1306 | } |
1da177e4 LT |
1307 | return res; |
1308 | } | |
1309 | ||
1310 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
3da28eb1 | 1311 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 LT |
1312 | { |
1313 | struct nfs_inode *nfsi = NFS_I(inode); | |
1314 | LIST_HEAD(head); | |
7d46a49f | 1315 | int res; |
1da177e4 LT |
1316 | |
1317 | spin_lock(&nfsi->req_lock); | |
3da28eb1 TM |
1318 | res = nfs_scan_commit(inode, &head, 0, 0); |
1319 | spin_unlock(&nfsi->req_lock); | |
1da177e4 | 1320 | if (res) { |
7d46a49f | 1321 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1322 | if (error < 0) |
1323 | return error; | |
1324 | } | |
1da177e4 LT |
1325 | return res; |
1326 | } | |
1327 | #endif | |
1328 | ||
1c75950b | 1329 | long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1330 | { |
1c75950b | 1331 | struct inode *inode = mapping->host; |
c42de9dd | 1332 | struct nfs_inode *nfsi = NFS_I(inode); |
1c75950b TM |
1333 | unsigned long idx_start, idx_end; |
1334 | unsigned int npages = 0; | |
c42de9dd | 1335 | LIST_HEAD(head); |
70b9ecbd | 1336 | int nocommit = how & FLUSH_NOCOMMIT; |
3f442547 | 1337 | long pages, ret; |
1da177e4 | 1338 | |
1c75950b TM |
1339 | /* FIXME */ |
1340 | if (wbc->range_cyclic) | |
1341 | idx_start = 0; | |
1342 | else { | |
1343 | idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1344 | idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1345 | if (idx_end > idx_start) { | |
1346 | unsigned long l_npages = 1 + idx_end - idx_start; | |
1347 | npages = l_npages; | |
1348 | if (sizeof(npages) != sizeof(l_npages) && | |
1349 | (unsigned long)npages != l_npages) | |
1350 | npages = 0; | |
1351 | } | |
1352 | } | |
c42de9dd TM |
1353 | how &= ~FLUSH_NOCOMMIT; |
1354 | spin_lock(&nfsi->req_lock); | |
1da177e4 | 1355 | do { |
1c75950b | 1356 | wbc->pages_skipped = 0; |
c42de9dd TM |
1357 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); |
1358 | if (ret != 0) | |
70b9ecbd | 1359 | continue; |
1c75950b | 1360 | pages = nfs_scan_dirty(mapping, wbc, &head); |
c42de9dd TM |
1361 | if (pages != 0) { |
1362 | spin_unlock(&nfsi->req_lock); | |
e8e058e8 | 1363 | if (how & FLUSH_INVALIDATE) { |
83715ad5 | 1364 | nfs_cancel_dirty_list(&head); |
e8e058e8 TM |
1365 | ret = pages; |
1366 | } else | |
d2ccddf0 | 1367 | ret = nfs_flush_list(inode, &head, pages, how); |
c42de9dd TM |
1368 | spin_lock(&nfsi->req_lock); |
1369 | continue; | |
1370 | } | |
1c75950b TM |
1371 | if (wbc->pages_skipped != 0) |
1372 | continue; | |
c42de9dd TM |
1373 | if (nocommit) |
1374 | break; | |
d2ccddf0 | 1375 | pages = nfs_scan_commit(inode, &head, idx_start, npages); |
1c75950b TM |
1376 | if (pages == 0) { |
1377 | if (wbc->pages_skipped != 0) | |
1378 | continue; | |
c42de9dd | 1379 | break; |
1c75950b | 1380 | } |
d2ccddf0 TM |
1381 | if (how & FLUSH_INVALIDATE) { |
1382 | spin_unlock(&nfsi->req_lock); | |
83715ad5 | 1383 | nfs_cancel_commit_list(&head); |
e8e058e8 | 1384 | ret = pages; |
d2ccddf0 TM |
1385 | spin_lock(&nfsi->req_lock); |
1386 | continue; | |
1387 | } | |
1388 | pages += nfs_scan_commit(inode, &head, 0, 0); | |
c42de9dd TM |
1389 | spin_unlock(&nfsi->req_lock); |
1390 | ret = nfs_commit_list(inode, &head, how); | |
1391 | spin_lock(&nfsi->req_lock); | |
1392 | } while (ret >= 0); | |
1393 | spin_unlock(&nfsi->req_lock); | |
1394 | return ret; | |
1da177e4 LT |
1395 | } |
1396 | ||
1c75950b TM |
1397 | /* |
1398 | * flush the inode to disk. | |
1399 | */ | |
1400 | int nfs_wb_all(struct inode *inode) | |
1401 | { | |
1402 | struct address_space *mapping = inode->i_mapping; | |
1403 | struct writeback_control wbc = { | |
1404 | .bdi = mapping->backing_dev_info, | |
1405 | .sync_mode = WB_SYNC_ALL, | |
1406 | .nr_to_write = LONG_MAX, | |
1407 | .range_cyclic = 1, | |
1408 | }; | |
1409 | int ret; | |
1410 | ||
1411 | ret = nfs_sync_mapping_wait(mapping, &wbc, 0); | |
1412 | if (ret >= 0) | |
1413 | return 0; | |
1414 | return ret; | |
1415 | } | |
1416 | ||
1417 | int nfs_sync_mapping_range(struct address_space *mapping, loff_t range_start, loff_t range_end, int how) | |
1418 | { | |
1419 | struct writeback_control wbc = { | |
1420 | .bdi = mapping->backing_dev_info, | |
1421 | .sync_mode = WB_SYNC_ALL, | |
1422 | .nr_to_write = LONG_MAX, | |
1423 | .range_start = range_start, | |
1424 | .range_end = range_end, | |
1425 | }; | |
1426 | int ret; | |
1427 | ||
1428 | ret = nfs_sync_mapping_wait(mapping, &wbc, how); | |
1429 | if (ret >= 0) | |
1430 | return 0; | |
1431 | return ret; | |
1432 | } | |
1433 | ||
1434 | static int nfs_wb_page_priority(struct inode *inode, struct page *page, int how) | |
1435 | { | |
1436 | loff_t range_start = page_offset(page); | |
1437 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
1438 | ||
1439 | return nfs_sync_mapping_range(inode->i_mapping, range_start, range_end, how | FLUSH_STABLE); | |
1440 | } | |
1441 | ||
1442 | /* | |
1443 | * Write back all requests on one page - we do this before reading it. | |
1444 | */ | |
1445 | int nfs_wb_page(struct inode *inode, struct page* page) | |
1446 | { | |
1447 | return nfs_wb_page_priority(inode, page, 0); | |
1448 | } | |
1449 | ||
1a54533e TM |
1450 | int nfs_set_page_dirty(struct page *page) |
1451 | { | |
1452 | struct nfs_page *req; | |
1453 | ||
1454 | req = nfs_page_find_request(page); | |
1455 | if (req != NULL) { | |
1456 | /* Mark any existing write requests for flushing */ | |
1457 | set_bit(PG_NEED_FLUSH, &req->wb_flags); | |
1458 | nfs_release_request(req); | |
1459 | } | |
1460 | return __set_page_dirty_nobuffers(page); | |
1461 | } | |
1462 | ||
1c75950b | 1463 | |
f7b422b1 | 1464 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1465 | { |
1466 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1467 | sizeof(struct nfs_write_data), | |
1468 | 0, SLAB_HWCACHE_ALIGN, | |
1469 | NULL, NULL); | |
1470 | if (nfs_wdata_cachep == NULL) | |
1471 | return -ENOMEM; | |
1472 | ||
93d2341c MD |
1473 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1474 | nfs_wdata_cachep); | |
1da177e4 LT |
1475 | if (nfs_wdata_mempool == NULL) |
1476 | return -ENOMEM; | |
1477 | ||
93d2341c MD |
1478 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1479 | nfs_wdata_cachep); | |
1da177e4 LT |
1480 | if (nfs_commit_mempool == NULL) |
1481 | return -ENOMEM; | |
1482 | ||
1483 | return 0; | |
1484 | } | |
1485 | ||
266bee88 | 1486 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1487 | { |
1488 | mempool_destroy(nfs_commit_mempool); | |
1489 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1490 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1491 | } |
1492 |