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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/write.c | |
3 | * | |
7c85d900 | 4 | * Write file data over NFS. |
1da177e4 LT |
5 | * |
6 | * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de> | |
7 | */ | |
8 | ||
1da177e4 LT |
9 | #include <linux/types.h> |
10 | #include <linux/slab.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/pagemap.h> | |
13 | #include <linux/file.h> | |
1da177e4 | 14 | #include <linux/writeback.h> |
89a09141 | 15 | #include <linux/swap.h> |
1da177e4 LT |
16 | |
17 | #include <linux/sunrpc/clnt.h> | |
18 | #include <linux/nfs_fs.h> | |
19 | #include <linux/nfs_mount.h> | |
20 | #include <linux/nfs_page.h> | |
3fcfab16 AM |
21 | #include <linux/backing-dev.h> |
22 | ||
1da177e4 | 23 | #include <asm/uaccess.h> |
1da177e4 LT |
24 | |
25 | #include "delegation.h" | |
49a70f27 | 26 | #include "internal.h" |
91d5b470 | 27 | #include "iostat.h" |
1da177e4 LT |
28 | |
29 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE | |
30 | ||
31 | #define MIN_POOL_WRITE (32) | |
32 | #define MIN_POOL_COMMIT (4) | |
33 | ||
34 | /* | |
35 | * Local function declarations | |
36 | */ | |
37 | static struct nfs_page * nfs_update_request(struct nfs_open_context*, | |
1da177e4 LT |
38 | struct page *, |
39 | unsigned int, unsigned int); | |
c63c7b05 TM |
40 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *desc, |
41 | struct inode *inode, int ioflags); | |
788e7a89 TM |
42 | static const struct rpc_call_ops nfs_write_partial_ops; |
43 | static const struct rpc_call_ops nfs_write_full_ops; | |
44 | static const struct rpc_call_ops nfs_commit_ops; | |
1da177e4 | 45 | |
e18b890b | 46 | static struct kmem_cache *nfs_wdata_cachep; |
3feb2d49 | 47 | static mempool_t *nfs_wdata_mempool; |
1da177e4 LT |
48 | static mempool_t *nfs_commit_mempool; |
49 | ||
e9f7bee1 | 50 | struct nfs_write_data *nfs_commit_alloc(void) |
1da177e4 | 51 | { |
e6b4f8da | 52 | struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS); |
40859d7e | 53 | |
1da177e4 LT |
54 | if (p) { |
55 | memset(p, 0, sizeof(*p)); | |
56 | INIT_LIST_HEAD(&p->pages); | |
57 | } | |
58 | return p; | |
59 | } | |
60 | ||
8aca67f0 | 61 | void nfs_commit_rcu_free(struct rcu_head *head) |
1da177e4 | 62 | { |
8aca67f0 | 63 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
40859d7e CL |
64 | if (p && (p->pagevec != &p->page_array[0])) |
65 | kfree(p->pagevec); | |
1da177e4 LT |
66 | mempool_free(p, nfs_commit_mempool); |
67 | } | |
68 | ||
8aca67f0 TM |
69 | void nfs_commit_free(struct nfs_write_data *wdata) |
70 | { | |
71 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_commit_rcu_free); | |
72 | } | |
73 | ||
8d5658c9 | 74 | struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount) |
3feb2d49 | 75 | { |
e6b4f8da | 76 | struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS); |
3feb2d49 TM |
77 | |
78 | if (p) { | |
79 | memset(p, 0, sizeof(*p)); | |
80 | INIT_LIST_HEAD(&p->pages); | |
e9f7bee1 | 81 | p->npages = pagecount; |
0d0b5cb3 CL |
82 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
83 | p->pagevec = p->page_array; | |
3feb2d49 | 84 | else { |
0d0b5cb3 CL |
85 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
86 | if (!p->pagevec) { | |
3feb2d49 TM |
87 | mempool_free(p, nfs_wdata_mempool); |
88 | p = NULL; | |
89 | } | |
90 | } | |
91 | } | |
92 | return p; | |
93 | } | |
94 | ||
8aca67f0 | 95 | static void nfs_writedata_rcu_free(struct rcu_head *head) |
3feb2d49 | 96 | { |
8aca67f0 | 97 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
3feb2d49 TM |
98 | if (p && (p->pagevec != &p->page_array[0])) |
99 | kfree(p->pagevec); | |
100 | mempool_free(p, nfs_wdata_mempool); | |
101 | } | |
102 | ||
8aca67f0 TM |
103 | static void nfs_writedata_free(struct nfs_write_data *wdata) |
104 | { | |
105 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_writedata_rcu_free); | |
106 | } | |
107 | ||
963d8fe5 | 108 | void nfs_writedata_release(void *wdata) |
1da177e4 | 109 | { |
1da177e4 LT |
110 | nfs_writedata_free(wdata); |
111 | } | |
112 | ||
277459d2 TM |
113 | static struct nfs_page *nfs_page_find_request_locked(struct page *page) |
114 | { | |
115 | struct nfs_page *req = NULL; | |
116 | ||
117 | if (PagePrivate(page)) { | |
118 | req = (struct nfs_page *)page_private(page); | |
119 | if (req != NULL) | |
120 | atomic_inc(&req->wb_count); | |
121 | } | |
122 | return req; | |
123 | } | |
124 | ||
125 | static struct nfs_page *nfs_page_find_request(struct page *page) | |
126 | { | |
127 | struct nfs_page *req = NULL; | |
128 | spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock; | |
129 | ||
130 | spin_lock(req_lock); | |
131 | req = nfs_page_find_request_locked(page); | |
132 | spin_unlock(req_lock); | |
133 | return req; | |
134 | } | |
135 | ||
1da177e4 LT |
136 | /* Adjust the file length if we're writing beyond the end */ |
137 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) | |
138 | { | |
139 | struct inode *inode = page->mapping->host; | |
140 | loff_t end, i_size = i_size_read(inode); | |
ca52fec1 | 141 | pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; |
1da177e4 LT |
142 | |
143 | if (i_size > 0 && page->index < end_index) | |
144 | return; | |
145 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); | |
146 | if (i_size >= end) | |
147 | return; | |
91d5b470 | 148 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
1da177e4 LT |
149 | i_size_write(inode, end); |
150 | } | |
151 | ||
a301b777 TM |
152 | /* A writeback failed: mark the page as bad, and invalidate the page cache */ |
153 | static void nfs_set_pageerror(struct page *page) | |
154 | { | |
155 | SetPageError(page); | |
156 | nfs_zap_mapping(page->mapping->host, page->mapping); | |
157 | } | |
158 | ||
1da177e4 LT |
159 | /* We can set the PG_uptodate flag if we see that a write request |
160 | * covers the full page. | |
161 | */ | |
162 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) | |
163 | { | |
1da177e4 LT |
164 | if (PageUptodate(page)) |
165 | return; | |
166 | if (base != 0) | |
167 | return; | |
49a70f27 | 168 | if (count != nfs_page_length(page)) |
1da177e4 | 169 | return; |
49a70f27 | 170 | if (count != PAGE_CACHE_SIZE) |
1da177e4 | 171 | memclear_highpage_flush(page, count, PAGE_CACHE_SIZE - count); |
49a70f27 | 172 | SetPageUptodate(page); |
1da177e4 LT |
173 | } |
174 | ||
e21195a7 | 175 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
1da177e4 LT |
176 | unsigned int offset, unsigned int count) |
177 | { | |
178 | struct nfs_page *req; | |
e21195a7 | 179 | int ret; |
1da177e4 | 180 | |
e21195a7 TM |
181 | for (;;) { |
182 | req = nfs_update_request(ctx, page, offset, count); | |
183 | if (!IS_ERR(req)) | |
184 | break; | |
185 | ret = PTR_ERR(req); | |
186 | if (ret != -EBUSY) | |
187 | return ret; | |
188 | ret = nfs_wb_page(page->mapping->host, page); | |
189 | if (ret != 0) | |
190 | return ret; | |
191 | } | |
1da177e4 LT |
192 | /* Update file length */ |
193 | nfs_grow_file(page, offset, count); | |
194 | /* Set the PG_uptodate flag? */ | |
195 | nfs_mark_uptodate(page, offset, count); | |
196 | nfs_unlock_request(req); | |
abd3e641 | 197 | return 0; |
1da177e4 LT |
198 | } |
199 | ||
200 | static int wb_priority(struct writeback_control *wbc) | |
201 | { | |
202 | if (wbc->for_reclaim) | |
c63c7b05 | 203 | return FLUSH_HIGHPRI | FLUSH_STABLE; |
1da177e4 LT |
204 | if (wbc->for_kupdate) |
205 | return FLUSH_LOWPRI; | |
206 | return 0; | |
207 | } | |
208 | ||
89a09141 PZ |
209 | /* |
210 | * NFS congestion control | |
211 | */ | |
212 | ||
213 | int nfs_congestion_kb; | |
214 | ||
215 | #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) | |
216 | #define NFS_CONGESTION_OFF_THRESH \ | |
217 | (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) | |
218 | ||
5a6d41b3 | 219 | static int nfs_set_page_writeback(struct page *page) |
89a09141 | 220 | { |
5a6d41b3 TM |
221 | int ret = test_set_page_writeback(page); |
222 | ||
223 | if (!ret) { | |
89a09141 PZ |
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 | } | |
5a6d41b3 | 231 | return ret; |
89a09141 PZ |
232 | } |
233 | ||
234 | static void nfs_end_page_writeback(struct page *page) | |
235 | { | |
236 | struct inode *inode = page->mapping->host; | |
237 | struct nfs_server *nfss = NFS_SERVER(inode); | |
238 | ||
239 | end_page_writeback(page); | |
240 | if (atomic_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) { | |
241 | clear_bdi_congested(&nfss->backing_dev_info, WRITE); | |
242 | congestion_end(WRITE); | |
243 | } | |
244 | } | |
245 | ||
e261f51f TM |
246 | /* |
247 | * Find an associated nfs write request, and prepare to flush it out | |
248 | * Returns 1 if there was no write request, or if the request was | |
249 | * already tagged by nfs_set_page_dirty.Returns 0 if the request | |
250 | * was not tagged. | |
251 | * May also return an error if the user signalled nfs_wait_on_request(). | |
252 | */ | |
c63c7b05 TM |
253 | static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, |
254 | struct page *page) | |
e261f51f TM |
255 | { |
256 | struct nfs_page *req; | |
612c9384 TM |
257 | struct nfs_inode *nfsi = NFS_I(page->mapping->host); |
258 | spinlock_t *req_lock = &nfsi->req_lock; | |
e261f51f TM |
259 | int ret; |
260 | ||
261 | spin_lock(req_lock); | |
262 | for(;;) { | |
263 | req = nfs_page_find_request_locked(page); | |
264 | if (req == NULL) { | |
265 | spin_unlock(req_lock); | |
266 | return 1; | |
267 | } | |
268 | if (nfs_lock_request_dontget(req)) | |
269 | break; | |
270 | /* Note: If we hold the page lock, as is the case in nfs_writepage, | |
271 | * then the call to nfs_lock_request_dontget() will always | |
272 | * succeed provided that someone hasn't already marked the | |
273 | * request as dirty (in which case we don't care). | |
274 | */ | |
275 | spin_unlock(req_lock); | |
c63c7b05 TM |
276 | /* Prevent deadlock! */ |
277 | nfs_pageio_complete(pgio); | |
e261f51f TM |
278 | ret = nfs_wait_on_request(req); |
279 | nfs_release_request(req); | |
280 | if (ret != 0) | |
281 | return ret; | |
282 | spin_lock(req_lock); | |
283 | } | |
612c9384 TM |
284 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
285 | /* This request is marked for commit */ | |
286 | spin_unlock(req_lock); | |
287 | nfs_unlock_request(req); | |
c63c7b05 | 288 | nfs_pageio_complete(pgio); |
612c9384 TM |
289 | return 1; |
290 | } | |
c63c7b05 | 291 | if (nfs_set_page_writeback(page) != 0) { |
612c9384 | 292 | spin_unlock(req_lock); |
c63c7b05 TM |
293 | BUG(); |
294 | } | |
295 | radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, | |
296 | NFS_PAGE_TAG_WRITEBACK); | |
e261f51f | 297 | ret = test_bit(PG_NEED_FLUSH, &req->wb_flags); |
c63c7b05 TM |
298 | spin_unlock(req_lock); |
299 | nfs_pageio_add_request(pgio, req); | |
e261f51f TM |
300 | return ret; |
301 | } | |
302 | ||
1da177e4 LT |
303 | /* |
304 | * Write an mmapped page to the server. | |
305 | */ | |
4d770ccf | 306 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) |
1da177e4 | 307 | { |
c63c7b05 | 308 | struct nfs_pageio_descriptor mypgio, *pgio; |
1da177e4 LT |
309 | struct nfs_open_context *ctx; |
310 | struct inode *inode = page->mapping->host; | |
49a70f27 | 311 | unsigned offset; |
e261f51f | 312 | int err; |
1da177e4 | 313 | |
91d5b470 CL |
314 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
315 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
316 | ||
c63c7b05 TM |
317 | if (wbc->for_writepages) |
318 | pgio = wbc->fs_private; | |
319 | else { | |
320 | nfs_pageio_init_write(&mypgio, inode, wb_priority(wbc)); | |
321 | pgio = &mypgio; | |
322 | } | |
323 | ||
324 | err = nfs_page_async_flush(pgio, page); | |
e261f51f TM |
325 | if (err <= 0) |
326 | goto out; | |
327 | err = 0; | |
49a70f27 TM |
328 | offset = nfs_page_length(page); |
329 | if (!offset) | |
1da177e4 | 330 | goto out; |
49a70f27 | 331 | |
d530838b | 332 | ctx = nfs_find_open_context(inode, NULL, FMODE_WRITE); |
1da177e4 LT |
333 | if (ctx == NULL) { |
334 | err = -EBADF; | |
335 | goto out; | |
336 | } | |
200baa21 | 337 | err = nfs_writepage_setup(ctx, page, 0, offset); |
1da177e4 | 338 | put_nfs_open_context(ctx); |
e261f51f TM |
339 | if (err != 0) |
340 | goto out; | |
c63c7b05 | 341 | err = nfs_page_async_flush(pgio, page); |
e261f51f TM |
342 | if (err > 0) |
343 | err = 0; | |
1da177e4 | 344 | out: |
200baa21 | 345 | if (!wbc->for_writepages) |
c63c7b05 | 346 | nfs_pageio_complete(pgio); |
4d770ccf TM |
347 | return err; |
348 | } | |
349 | ||
350 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
351 | { | |
352 | int err; | |
353 | ||
354 | err = nfs_writepage_locked(page, wbc); | |
1da177e4 | 355 | unlock_page(page); |
1da177e4 LT |
356 | return err; |
357 | } | |
358 | ||
1da177e4 LT |
359 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) |
360 | { | |
1da177e4 | 361 | struct inode *inode = mapping->host; |
c63c7b05 | 362 | struct nfs_pageio_descriptor pgio; |
1da177e4 LT |
363 | int err; |
364 | ||
91d5b470 CL |
365 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
366 | ||
c63c7b05 TM |
367 | nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); |
368 | wbc->fs_private = &pgio; | |
1da177e4 | 369 | err = generic_writepages(mapping, wbc); |
c63c7b05 | 370 | nfs_pageio_complete(&pgio); |
1da177e4 LT |
371 | if (err) |
372 | return err; | |
c63c7b05 TM |
373 | if (pgio.pg_error) |
374 | return pgio.pg_error; | |
375 | return 0; | |
1da177e4 LT |
376 | } |
377 | ||
378 | /* | |
379 | * Insert a write request into an inode | |
380 | */ | |
381 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) | |
382 | { | |
383 | struct nfs_inode *nfsi = NFS_I(inode); | |
384 | int error; | |
385 | ||
386 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); | |
387 | BUG_ON(error == -EEXIST); | |
388 | if (error) | |
389 | return error; | |
390 | if (!nfsi->npages) { | |
391 | igrab(inode); | |
392 | nfs_begin_data_update(inode); | |
393 | if (nfs_have_delegation(inode, FMODE_WRITE)) | |
394 | nfsi->change_attr++; | |
395 | } | |
deb7d638 | 396 | SetPagePrivate(req->wb_page); |
277459d2 | 397 | set_page_private(req->wb_page, (unsigned long)req); |
2b82f190 TM |
398 | if (PageDirty(req->wb_page)) |
399 | set_bit(PG_NEED_FLUSH, &req->wb_flags); | |
1da177e4 LT |
400 | nfsi->npages++; |
401 | atomic_inc(&req->wb_count); | |
402 | return 0; | |
403 | } | |
404 | ||
405 | /* | |
89a09141 | 406 | * Remove a write request from an inode |
1da177e4 LT |
407 | */ |
408 | static void nfs_inode_remove_request(struct nfs_page *req) | |
409 | { | |
410 | struct inode *inode = req->wb_context->dentry->d_inode; | |
411 | struct nfs_inode *nfsi = NFS_I(inode); | |
412 | ||
413 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
414 | ||
415 | spin_lock(&nfsi->req_lock); | |
277459d2 | 416 | set_page_private(req->wb_page, 0); |
deb7d638 | 417 | ClearPagePrivate(req->wb_page); |
1da177e4 | 418 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
2b82f190 TM |
419 | if (test_and_clear_bit(PG_NEED_FLUSH, &req->wb_flags)) |
420 | __set_page_dirty_nobuffers(req->wb_page); | |
1da177e4 LT |
421 | nfsi->npages--; |
422 | if (!nfsi->npages) { | |
423 | spin_unlock(&nfsi->req_lock); | |
951a143b | 424 | nfs_end_data_update(inode); |
1da177e4 LT |
425 | iput(inode); |
426 | } else | |
427 | spin_unlock(&nfsi->req_lock); | |
428 | nfs_clear_request(req); | |
429 | nfs_release_request(req); | |
430 | } | |
431 | ||
61822ab5 TM |
432 | static void |
433 | nfs_redirty_request(struct nfs_page *req) | |
434 | { | |
61822ab5 TM |
435 | __set_page_dirty_nobuffers(req->wb_page); |
436 | } | |
437 | ||
1da177e4 LT |
438 | /* |
439 | * Check if a request is dirty | |
440 | */ | |
441 | static inline int | |
442 | nfs_dirty_request(struct nfs_page *req) | |
443 | { | |
5a6d41b3 TM |
444 | struct page *page = req->wb_page; |
445 | ||
612c9384 | 446 | if (page == NULL || test_bit(PG_NEED_COMMIT, &req->wb_flags)) |
5a6d41b3 TM |
447 | return 0; |
448 | return !PageWriteback(req->wb_page); | |
1da177e4 LT |
449 | } |
450 | ||
451 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
452 | /* | |
453 | * Add a request to the inode's commit list. | |
454 | */ | |
455 | static void | |
456 | nfs_mark_request_commit(struct nfs_page *req) | |
457 | { | |
458 | struct inode *inode = req->wb_context->dentry->d_inode; | |
459 | struct nfs_inode *nfsi = NFS_I(inode); | |
460 | ||
461 | spin_lock(&nfsi->req_lock); | |
462 | nfs_list_add_request(req, &nfsi->commit); | |
463 | nfsi->ncommit++; | |
612c9384 | 464 | set_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
1da177e4 | 465 | spin_unlock(&nfsi->req_lock); |
fd39fc85 | 466 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
a1803044 | 467 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1da177e4 | 468 | } |
8e821cad TM |
469 | |
470 | static inline | |
471 | int nfs_write_need_commit(struct nfs_write_data *data) | |
472 | { | |
473 | return data->verf.committed != NFS_FILE_SYNC; | |
474 | } | |
475 | ||
476 | static inline | |
477 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
478 | { | |
612c9384 | 479 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
8e821cad TM |
480 | nfs_mark_request_commit(req); |
481 | return 1; | |
482 | } | |
483 | if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { | |
484 | nfs_redirty_request(req); | |
485 | return 1; | |
486 | } | |
487 | return 0; | |
488 | } | |
489 | #else | |
490 | static inline void | |
491 | nfs_mark_request_commit(struct nfs_page *req) | |
492 | { | |
493 | } | |
494 | ||
495 | static inline | |
496 | int nfs_write_need_commit(struct nfs_write_data *data) | |
497 | { | |
498 | return 0; | |
499 | } | |
500 | ||
501 | static inline | |
502 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
503 | { | |
504 | return 0; | |
505 | } | |
1da177e4 LT |
506 | #endif |
507 | ||
508 | /* | |
509 | * Wait for a request to complete. | |
510 | * | |
511 | * Interruptible by signals only if mounted with intr flag. | |
512 | */ | |
ca52fec1 | 513 | static int nfs_wait_on_requests_locked(struct inode *inode, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
514 | { |
515 | struct nfs_inode *nfsi = NFS_I(inode); | |
516 | struct nfs_page *req; | |
ca52fec1 | 517 | pgoff_t idx_end, next; |
1da177e4 LT |
518 | unsigned int res = 0; |
519 | int error; | |
520 | ||
521 | if (npages == 0) | |
522 | idx_end = ~0; | |
523 | else | |
524 | idx_end = idx_start + npages - 1; | |
525 | ||
1da177e4 | 526 | next = idx_start; |
c6a556b8 | 527 | while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_WRITEBACK)) { |
1da177e4 LT |
528 | if (req->wb_index > idx_end) |
529 | break; | |
530 | ||
531 | next = req->wb_index + 1; | |
c6a556b8 | 532 | BUG_ON(!NFS_WBACK_BUSY(req)); |
1da177e4 LT |
533 | |
534 | atomic_inc(&req->wb_count); | |
535 | spin_unlock(&nfsi->req_lock); | |
536 | error = nfs_wait_on_request(req); | |
537 | nfs_release_request(req); | |
c42de9dd | 538 | spin_lock(&nfsi->req_lock); |
1da177e4 LT |
539 | if (error < 0) |
540 | return error; | |
1da177e4 LT |
541 | res++; |
542 | } | |
1da177e4 LT |
543 | return res; |
544 | } | |
545 | ||
83715ad5 TM |
546 | static void nfs_cancel_commit_list(struct list_head *head) |
547 | { | |
548 | struct nfs_page *req; | |
549 | ||
550 | while(!list_empty(head)) { | |
551 | req = nfs_list_entry(head->next); | |
b6dff26a | 552 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
83715ad5 | 553 | nfs_list_remove_request(req); |
612c9384 | 554 | clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
83715ad5 | 555 | nfs_inode_remove_request(req); |
b6dff26a | 556 | nfs_unlock_request(req); |
83715ad5 TM |
557 | } |
558 | } | |
559 | ||
1da177e4 LT |
560 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
561 | /* | |
562 | * nfs_scan_commit - Scan an inode for commit requests | |
563 | * @inode: NFS inode to scan | |
564 | * @dst: destination list | |
565 | * @idx_start: lower bound of page->index to scan. | |
566 | * @npages: idx_start + npages sets the upper bound to scan. | |
567 | * | |
568 | * Moves requests from the inode's 'commit' request list. | |
569 | * The requests are *not* checked to ensure that they form a contiguous set. | |
570 | */ | |
571 | static int | |
ca52fec1 | 572 | nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
573 | { |
574 | struct nfs_inode *nfsi = NFS_I(inode); | |
3da28eb1 TM |
575 | int res = 0; |
576 | ||
577 | if (nfsi->ncommit != 0) { | |
d2ccddf0 | 578 | res = nfs_scan_list(nfsi, &nfsi->commit, dst, idx_start, npages); |
3da28eb1 TM |
579 | nfsi->ncommit -= res; |
580 | if ((nfsi->ncommit == 0) != list_empty(&nfsi->commit)) | |
581 | printk(KERN_ERR "NFS: desynchronized value of nfs_i.ncommit.\n"); | |
582 | } | |
1da177e4 LT |
583 | return res; |
584 | } | |
c42de9dd | 585 | #else |
ca52fec1 | 586 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
c42de9dd TM |
587 | { |
588 | return 0; | |
589 | } | |
1da177e4 LT |
590 | #endif |
591 | ||
1da177e4 LT |
592 | /* |
593 | * Try to update any existing write request, or create one if there is none. | |
594 | * In order to match, the request's credentials must match those of | |
595 | * the calling process. | |
596 | * | |
597 | * Note: Should always be called with the Page Lock held! | |
598 | */ | |
599 | static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, | |
e21195a7 | 600 | struct page *page, unsigned int offset, unsigned int bytes) |
1da177e4 | 601 | { |
89a09141 PZ |
602 | struct address_space *mapping = page->mapping; |
603 | struct inode *inode = mapping->host; | |
1da177e4 LT |
604 | struct nfs_inode *nfsi = NFS_I(inode); |
605 | struct nfs_page *req, *new = NULL; | |
ca52fec1 | 606 | pgoff_t rqend, end; |
1da177e4 LT |
607 | |
608 | end = offset + bytes; | |
609 | ||
1da177e4 LT |
610 | for (;;) { |
611 | /* Loop over all inode entries and see if we find | |
612 | * A request for the page we wish to update | |
613 | */ | |
614 | spin_lock(&nfsi->req_lock); | |
277459d2 | 615 | req = nfs_page_find_request_locked(page); |
1da177e4 LT |
616 | if (req) { |
617 | if (!nfs_lock_request_dontget(req)) { | |
618 | int error; | |
277459d2 | 619 | |
1da177e4 LT |
620 | spin_unlock(&nfsi->req_lock); |
621 | error = nfs_wait_on_request(req); | |
622 | nfs_release_request(req); | |
1dd594b2 NB |
623 | if (error < 0) { |
624 | if (new) | |
625 | nfs_release_request(new); | |
1da177e4 | 626 | return ERR_PTR(error); |
1dd594b2 | 627 | } |
1da177e4 LT |
628 | continue; |
629 | } | |
630 | spin_unlock(&nfsi->req_lock); | |
631 | if (new) | |
632 | nfs_release_request(new); | |
633 | break; | |
634 | } | |
635 | ||
636 | if (new) { | |
637 | int error; | |
638 | nfs_lock_request_dontget(new); | |
639 | error = nfs_inode_add_request(inode, new); | |
640 | if (error) { | |
641 | spin_unlock(&nfsi->req_lock); | |
642 | nfs_unlock_request(new); | |
643 | return ERR_PTR(error); | |
644 | } | |
645 | spin_unlock(&nfsi->req_lock); | |
1da177e4 LT |
646 | return new; |
647 | } | |
648 | spin_unlock(&nfsi->req_lock); | |
649 | ||
650 | new = nfs_create_request(ctx, inode, page, offset, bytes); | |
651 | if (IS_ERR(new)) | |
652 | return new; | |
653 | } | |
654 | ||
655 | /* We have a request for our page. | |
656 | * If the creds don't match, or the | |
657 | * page addresses don't match, | |
658 | * tell the caller to wait on the conflicting | |
659 | * request. | |
660 | */ | |
661 | rqend = req->wb_offset + req->wb_bytes; | |
662 | if (req->wb_context != ctx | |
663 | || req->wb_page != page | |
664 | || !nfs_dirty_request(req) | |
665 | || offset > rqend || end < req->wb_offset) { | |
666 | nfs_unlock_request(req); | |
667 | return ERR_PTR(-EBUSY); | |
668 | } | |
669 | ||
670 | /* Okay, the request matches. Update the region */ | |
671 | if (offset < req->wb_offset) { | |
672 | req->wb_offset = offset; | |
673 | req->wb_pgbase = offset; | |
674 | req->wb_bytes = rqend - req->wb_offset; | |
675 | } | |
676 | ||
677 | if (end > rqend) | |
678 | req->wb_bytes = end - req->wb_offset; | |
679 | ||
680 | return req; | |
681 | } | |
682 | ||
683 | int nfs_flush_incompatible(struct file *file, struct page *page) | |
684 | { | |
685 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 | 686 | struct nfs_page *req; |
1a54533e | 687 | int do_flush, status; |
1da177e4 LT |
688 | /* |
689 | * Look for a request corresponding to this page. If there | |
690 | * is one, and it belongs to another file, we flush it out | |
691 | * before we try to copy anything into the page. Do this | |
692 | * due to the lack of an ACCESS-type call in NFSv2. | |
693 | * Also do the same if we find a request from an existing | |
694 | * dropped page. | |
695 | */ | |
1a54533e TM |
696 | do { |
697 | req = nfs_page_find_request(page); | |
698 | if (req == NULL) | |
699 | return 0; | |
700 | do_flush = req->wb_page != page || req->wb_context != ctx | |
e261f51f | 701 | || !nfs_dirty_request(req); |
1da177e4 | 702 | nfs_release_request(req); |
1a54533e TM |
703 | if (!do_flush) |
704 | return 0; | |
705 | status = nfs_wb_page(page->mapping->host, page); | |
706 | } while (status == 0); | |
707 | return status; | |
1da177e4 LT |
708 | } |
709 | ||
710 | /* | |
711 | * Update and possibly write a cached page of an NFS file. | |
712 | * | |
713 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
714 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
715 | */ | |
716 | int nfs_updatepage(struct file *file, struct page *page, | |
717 | unsigned int offset, unsigned int count) | |
718 | { | |
719 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 | 720 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
721 | int status = 0; |
722 | ||
91d5b470 CL |
723 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
724 | ||
1da177e4 | 725 | dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", |
01cce933 JJS |
726 | file->f_path.dentry->d_parent->d_name.name, |
727 | file->f_path.dentry->d_name.name, count, | |
0bbacc40 | 728 | (long long)(page_offset(page) +offset)); |
1da177e4 | 729 | |
1da177e4 LT |
730 | /* If we're not using byte range locks, and we know the page |
731 | * is entirely in cache, it may be more efficient to avoid | |
732 | * fragmenting write requests. | |
733 | */ | |
ab0a3dbe | 734 | if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) { |
49a70f27 | 735 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 736 | offset = 0; |
1da177e4 LT |
737 | } |
738 | ||
e21195a7 | 739 | status = nfs_writepage_setup(ctx, page, offset, count); |
e261f51f | 740 | __set_page_dirty_nobuffers(page); |
1da177e4 | 741 | |
1da177e4 LT |
742 | dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", |
743 | status, (long long)i_size_read(inode)); | |
744 | if (status < 0) | |
a301b777 | 745 | nfs_set_pageerror(page); |
1da177e4 LT |
746 | return status; |
747 | } | |
748 | ||
749 | static void nfs_writepage_release(struct nfs_page *req) | |
750 | { | |
1da177e4 | 751 | |
8e821cad TM |
752 | if (PageError(req->wb_page) || !nfs_reschedule_unstable_write(req)) { |
753 | nfs_end_page_writeback(req->wb_page); | |
754 | nfs_inode_remove_request(req); | |
755 | } else | |
756 | nfs_end_page_writeback(req->wb_page); | |
c6a556b8 | 757 | nfs_clear_page_writeback(req); |
1da177e4 LT |
758 | } |
759 | ||
760 | static inline int flush_task_priority(int how) | |
761 | { | |
762 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
763 | case FLUSH_HIGHPRI: | |
764 | return RPC_PRIORITY_HIGH; | |
765 | case FLUSH_LOWPRI: | |
766 | return RPC_PRIORITY_LOW; | |
767 | } | |
768 | return RPC_PRIORITY_NORMAL; | |
769 | } | |
770 | ||
771 | /* | |
772 | * Set up the argument/result storage required for the RPC call. | |
773 | */ | |
774 | static void nfs_write_rpcsetup(struct nfs_page *req, | |
775 | struct nfs_write_data *data, | |
788e7a89 | 776 | const struct rpc_call_ops *call_ops, |
1da177e4 LT |
777 | unsigned int count, unsigned int offset, |
778 | int how) | |
779 | { | |
1da177e4 | 780 | struct inode *inode; |
788e7a89 | 781 | int flags; |
1da177e4 LT |
782 | |
783 | /* Set up the RPC argument and reply structs | |
784 | * NB: take care not to mess about with data->commit et al. */ | |
785 | ||
786 | data->req = req; | |
787 | data->inode = inode = req->wb_context->dentry->d_inode; | |
788 | data->cred = req->wb_context->cred; | |
789 | ||
790 | data->args.fh = NFS_FH(inode); | |
791 | data->args.offset = req_offset(req) + offset; | |
792 | data->args.pgbase = req->wb_pgbase + offset; | |
793 | data->args.pages = data->pagevec; | |
794 | data->args.count = count; | |
795 | data->args.context = req->wb_context; | |
796 | ||
797 | data->res.fattr = &data->fattr; | |
798 | data->res.count = count; | |
799 | data->res.verf = &data->verf; | |
0e574af1 | 800 | nfs_fattr_init(&data->fattr); |
1da177e4 | 801 | |
788e7a89 TM |
802 | /* Set up the initial task struct. */ |
803 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
804 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data); | |
1da177e4 LT |
805 | NFS_PROTO(inode)->write_setup(data, how); |
806 | ||
807 | data->task.tk_priority = flush_task_priority(how); | |
808 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 809 | |
a3f565b1 CL |
810 | dprintk("NFS: %5u initiated write call " |
811 | "(req %s/%Ld, %u bytes @ offset %Lu)\n", | |
0bbacc40 | 812 | data->task.tk_pid, |
1da177e4 LT |
813 | inode->i_sb->s_id, |
814 | (long long)NFS_FILEID(inode), | |
815 | count, | |
816 | (unsigned long long)data->args.offset); | |
817 | } | |
818 | ||
819 | static void nfs_execute_write(struct nfs_write_data *data) | |
820 | { | |
821 | struct rpc_clnt *clnt = NFS_CLIENT(data->inode); | |
822 | sigset_t oldset; | |
823 | ||
824 | rpc_clnt_sigmask(clnt, &oldset); | |
1da177e4 | 825 | rpc_execute(&data->task); |
1da177e4 LT |
826 | rpc_clnt_sigunmask(clnt, &oldset); |
827 | } | |
828 | ||
829 | /* | |
830 | * Generate multiple small requests to write out a single | |
831 | * contiguous dirty area on one page. | |
832 | */ | |
8d5658c9 | 833 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
834 | { |
835 | struct nfs_page *req = nfs_list_entry(head->next); | |
836 | struct page *page = req->wb_page; | |
837 | struct nfs_write_data *data; | |
e9f7bee1 TM |
838 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
839 | unsigned int offset; | |
1da177e4 LT |
840 | int requests = 0; |
841 | LIST_HEAD(list); | |
842 | ||
843 | nfs_list_remove_request(req); | |
844 | ||
bcb71bba | 845 | nbytes = count; |
e9f7bee1 TM |
846 | do { |
847 | size_t len = min(nbytes, wsize); | |
848 | ||
8d5658c9 | 849 | data = nfs_writedata_alloc(1); |
1da177e4 LT |
850 | if (!data) |
851 | goto out_bad; | |
852 | list_add(&data->pages, &list); | |
853 | requests++; | |
e9f7bee1 TM |
854 | nbytes -= len; |
855 | } while (nbytes != 0); | |
1da177e4 LT |
856 | atomic_set(&req->wb_complete, requests); |
857 | ||
858 | ClearPageError(page); | |
1da177e4 | 859 | offset = 0; |
bcb71bba | 860 | nbytes = count; |
1da177e4 LT |
861 | do { |
862 | data = list_entry(list.next, struct nfs_write_data, pages); | |
863 | list_del_init(&data->pages); | |
864 | ||
865 | data->pagevec[0] = page; | |
1da177e4 | 866 | |
bcb71bba TM |
867 | if (nbytes < wsize) |
868 | wsize = nbytes; | |
869 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, | |
870 | wsize, offset, how); | |
871 | offset += wsize; | |
872 | nbytes -= wsize; | |
1da177e4 LT |
873 | nfs_execute_write(data); |
874 | } while (nbytes != 0); | |
875 | ||
876 | return 0; | |
877 | ||
878 | out_bad: | |
879 | while (!list_empty(&list)) { | |
880 | data = list_entry(list.next, struct nfs_write_data, pages); | |
881 | list_del(&data->pages); | |
8aca67f0 | 882 | nfs_writedata_release(data); |
1da177e4 | 883 | } |
61822ab5 | 884 | nfs_redirty_request(req); |
6d677e35 | 885 | nfs_end_page_writeback(req->wb_page); |
c6a556b8 | 886 | nfs_clear_page_writeback(req); |
1da177e4 LT |
887 | return -ENOMEM; |
888 | } | |
889 | ||
890 | /* | |
891 | * Create an RPC task for the given write request and kick it. | |
892 | * The page must have been locked by the caller. | |
893 | * | |
894 | * It may happen that the page we're passed is not marked dirty. | |
895 | * This is the case if nfs_updatepage detects a conflicting request | |
896 | * that has been written but not committed. | |
897 | */ | |
8d5658c9 | 898 | static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
899 | { |
900 | struct nfs_page *req; | |
901 | struct page **pages; | |
902 | struct nfs_write_data *data; | |
1da177e4 | 903 | |
8d5658c9 | 904 | data = nfs_writedata_alloc(npages); |
1da177e4 LT |
905 | if (!data) |
906 | goto out_bad; | |
907 | ||
908 | pages = data->pagevec; | |
1da177e4 LT |
909 | while (!list_empty(head)) { |
910 | req = nfs_list_entry(head->next); | |
911 | nfs_list_remove_request(req); | |
912 | nfs_list_add_request(req, &data->pages); | |
913 | ClearPageError(req->wb_page); | |
1da177e4 | 914 | *pages++ = req->wb_page; |
1da177e4 LT |
915 | } |
916 | req = nfs_list_entry(data->pages.next); | |
917 | ||
1da177e4 | 918 | /* Set up the argument struct */ |
788e7a89 | 919 | nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 LT |
920 | |
921 | nfs_execute_write(data); | |
922 | return 0; | |
923 | out_bad: | |
924 | while (!list_empty(head)) { | |
925 | struct nfs_page *req = nfs_list_entry(head->next); | |
926 | nfs_list_remove_request(req); | |
61822ab5 | 927 | nfs_redirty_request(req); |
6d677e35 | 928 | nfs_end_page_writeback(req->wb_page); |
c6a556b8 | 929 | nfs_clear_page_writeback(req); |
1da177e4 LT |
930 | } |
931 | return -ENOMEM; | |
932 | } | |
933 | ||
c63c7b05 TM |
934 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, |
935 | struct inode *inode, int ioflags) | |
1da177e4 | 936 | { |
7d46a49f | 937 | int wsize = NFS_SERVER(inode)->wsize; |
1da177e4 | 938 | |
bcb71bba | 939 | if (wsize < PAGE_CACHE_SIZE) |
c63c7b05 | 940 | nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); |
bcb71bba | 941 | else |
c63c7b05 | 942 | nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); |
1da177e4 LT |
943 | } |
944 | ||
945 | /* | |
946 | * Handle a write reply that flushed part of a page. | |
947 | */ | |
788e7a89 | 948 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 949 | { |
788e7a89 | 950 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
951 | struct nfs_page *req = data->req; |
952 | struct page *page = req->wb_page; | |
953 | ||
954 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
955 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
956 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
957 | req->wb_bytes, | |
958 | (long long)req_offset(req)); | |
959 | ||
788e7a89 TM |
960 | if (nfs_writeback_done(task, data) != 0) |
961 | return; | |
962 | ||
963 | if (task->tk_status < 0) { | |
a301b777 | 964 | nfs_set_pageerror(page); |
788e7a89 TM |
965 | req->wb_context->error = task->tk_status; |
966 | dprintk(", error = %d\n", task->tk_status); | |
8e821cad | 967 | goto out; |
1da177e4 LT |
968 | } |
969 | ||
8e821cad TM |
970 | if (nfs_write_need_commit(data)) { |
971 | spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock; | |
972 | ||
973 | spin_lock(req_lock); | |
974 | if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { | |
975 | /* Do nothing we need to resend the writes */ | |
976 | } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
977 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
978 | dprintk(" defer commit\n"); | |
979 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
980 | set_bit(PG_NEED_RESCHED, &req->wb_flags); | |
981 | clear_bit(PG_NEED_COMMIT, &req->wb_flags); | |
982 | dprintk(" server reboot detected\n"); | |
983 | } | |
984 | spin_unlock(req_lock); | |
985 | } else | |
986 | dprintk(" OK\n"); | |
987 | ||
988 | out: | |
1da177e4 LT |
989 | if (atomic_dec_and_test(&req->wb_complete)) |
990 | nfs_writepage_release(req); | |
991 | } | |
992 | ||
788e7a89 TM |
993 | static const struct rpc_call_ops nfs_write_partial_ops = { |
994 | .rpc_call_done = nfs_writeback_done_partial, | |
995 | .rpc_release = nfs_writedata_release, | |
996 | }; | |
997 | ||
1da177e4 LT |
998 | /* |
999 | * Handle a write reply that flushes a whole page. | |
1000 | * | |
1001 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
1002 | * writebacks since the page->count is kept > 1 for as long | |
1003 | * as the page has a write request pending. | |
1004 | */ | |
788e7a89 | 1005 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 1006 | { |
788e7a89 | 1007 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
1008 | struct nfs_page *req; |
1009 | struct page *page; | |
1010 | ||
788e7a89 TM |
1011 | if (nfs_writeback_done(task, data) != 0) |
1012 | return; | |
1013 | ||
1da177e4 LT |
1014 | /* Update attributes as result of writeback. */ |
1015 | while (!list_empty(&data->pages)) { | |
1016 | req = nfs_list_entry(data->pages.next); | |
1017 | nfs_list_remove_request(req); | |
1018 | page = req->wb_page; | |
1019 | ||
1020 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
1021 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1022 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1023 | req->wb_bytes, | |
1024 | (long long)req_offset(req)); | |
1025 | ||
788e7a89 | 1026 | if (task->tk_status < 0) { |
a301b777 | 1027 | nfs_set_pageerror(page); |
788e7a89 | 1028 | req->wb_context->error = task->tk_status; |
788e7a89 | 1029 | dprintk(", error = %d\n", task->tk_status); |
8e821cad | 1030 | goto remove_request; |
1da177e4 | 1031 | } |
1da177e4 | 1032 | |
8e821cad TM |
1033 | if (nfs_write_need_commit(data)) { |
1034 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1035 | nfs_mark_request_commit(req); | |
1036 | nfs_end_page_writeback(page); | |
1037 | dprintk(" marked for commit\n"); | |
1da177e4 LT |
1038 | goto next; |
1039 | } | |
8e821cad TM |
1040 | dprintk(" OK\n"); |
1041 | remove_request: | |
1042 | nfs_end_page_writeback(page); | |
1da177e4 | 1043 | nfs_inode_remove_request(req); |
1da177e4 | 1044 | next: |
c6a556b8 | 1045 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1046 | } |
1047 | } | |
1048 | ||
788e7a89 TM |
1049 | static const struct rpc_call_ops nfs_write_full_ops = { |
1050 | .rpc_call_done = nfs_writeback_done_full, | |
1051 | .rpc_release = nfs_writedata_release, | |
1052 | }; | |
1053 | ||
1054 | ||
1da177e4 LT |
1055 | /* |
1056 | * This function is called when the WRITE call is complete. | |
1057 | */ | |
462d5b32 | 1058 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1059 | { |
1da177e4 LT |
1060 | struct nfs_writeargs *argp = &data->args; |
1061 | struct nfs_writeres *resp = &data->res; | |
788e7a89 | 1062 | int status; |
1da177e4 | 1063 | |
a3f565b1 | 1064 | dprintk("NFS: %5u nfs_writeback_done (status %d)\n", |
1da177e4 LT |
1065 | task->tk_pid, task->tk_status); |
1066 | ||
f551e44f CL |
1067 | /* |
1068 | * ->write_done will attempt to use post-op attributes to detect | |
1069 | * conflicting writes by other clients. A strict interpretation | |
1070 | * of close-to-open would allow us to continue caching even if | |
1071 | * another writer had changed the file, but some applications | |
1072 | * depend on tighter cache coherency when writing. | |
1073 | */ | |
788e7a89 TM |
1074 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1075 | if (status != 0) | |
1076 | return status; | |
91d5b470 CL |
1077 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1078 | ||
1da177e4 LT |
1079 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1080 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1081 | /* We tried a write call, but the server did not | |
1082 | * commit data to stable storage even though we | |
1083 | * requested it. | |
1084 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1085 | * the server reports NFS_DATA_SYNC, but performs | |
1086 | * NFS_FILE_SYNC. We therefore implement this checking | |
1087 | * as a dprintk() in order to avoid filling syslog. | |
1088 | */ | |
1089 | static unsigned long complain; | |
1090 | ||
1091 | if (time_before(complain, jiffies)) { | |
1092 | dprintk("NFS: faulty NFS server %s:" | |
1093 | " (committed = %d) != (stable = %d)\n", | |
54ceac45 | 1094 | NFS_SERVER(data->inode)->nfs_client->cl_hostname, |
1da177e4 LT |
1095 | resp->verf->committed, argp->stable); |
1096 | complain = jiffies + 300 * HZ; | |
1097 | } | |
1098 | } | |
1099 | #endif | |
1100 | /* Is this a short write? */ | |
1101 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1102 | static unsigned long complain; | |
1103 | ||
91d5b470 CL |
1104 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1105 | ||
1da177e4 LT |
1106 | /* Has the server at least made some progress? */ |
1107 | if (resp->count != 0) { | |
1108 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1109 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1110 | /* Resend from where the server left off */ | |
1111 | argp->offset += resp->count; | |
1112 | argp->pgbase += resp->count; | |
1113 | argp->count -= resp->count; | |
1114 | } else { | |
1115 | /* Resend as a stable write in order to avoid | |
1116 | * headaches in the case of a server crash. | |
1117 | */ | |
1118 | argp->stable = NFS_FILE_SYNC; | |
1119 | } | |
1120 | rpc_restart_call(task); | |
788e7a89 | 1121 | return -EAGAIN; |
1da177e4 LT |
1122 | } |
1123 | if (time_before(complain, jiffies)) { | |
1124 | printk(KERN_WARNING | |
1125 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1126 | argp->count); | |
1127 | complain = jiffies + 300 * HZ; | |
1128 | } | |
1129 | /* Can't do anything about it except throw an error. */ | |
1130 | task->tk_status = -EIO; | |
1131 | } | |
788e7a89 | 1132 | return 0; |
1da177e4 LT |
1133 | } |
1134 | ||
1135 | ||
1136 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
963d8fe5 | 1137 | void nfs_commit_release(void *wdata) |
1da177e4 | 1138 | { |
1da177e4 LT |
1139 | nfs_commit_free(wdata); |
1140 | } | |
1141 | ||
1142 | /* | |
1143 | * Set up the argument/result storage required for the RPC call. | |
1144 | */ | |
1145 | static void nfs_commit_rpcsetup(struct list_head *head, | |
788e7a89 TM |
1146 | struct nfs_write_data *data, |
1147 | int how) | |
1da177e4 | 1148 | { |
3da28eb1 | 1149 | struct nfs_page *first; |
1da177e4 | 1150 | struct inode *inode; |
788e7a89 | 1151 | int flags; |
1da177e4 LT |
1152 | |
1153 | /* Set up the RPC argument and reply structs | |
1154 | * NB: take care not to mess about with data->commit et al. */ | |
1155 | ||
1156 | list_splice_init(head, &data->pages); | |
1157 | first = nfs_list_entry(data->pages.next); | |
1da177e4 LT |
1158 | inode = first->wb_context->dentry->d_inode; |
1159 | ||
1da177e4 LT |
1160 | data->inode = inode; |
1161 | data->cred = first->wb_context->cred; | |
1162 | ||
1163 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1164 | /* Note: we always request a commit of the entire inode */ |
1165 | data->args.offset = 0; | |
1166 | data->args.count = 0; | |
1167 | data->res.count = 0; | |
1da177e4 LT |
1168 | data->res.fattr = &data->fattr; |
1169 | data->res.verf = &data->verf; | |
0e574af1 | 1170 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1171 | |
1172 | /* Set up the initial task struct. */ | |
1173 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
1174 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data); | |
1da177e4 LT |
1175 | NFS_PROTO(inode)->commit_setup(data, how); |
1176 | ||
1177 | data->task.tk_priority = flush_task_priority(how); | |
1178 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 1179 | |
a3f565b1 | 1180 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); |
1da177e4 LT |
1181 | } |
1182 | ||
1183 | /* | |
1184 | * Commit dirty pages | |
1185 | */ | |
1186 | static int | |
40859d7e | 1187 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1188 | { |
1189 | struct nfs_write_data *data; | |
1190 | struct nfs_page *req; | |
1191 | ||
e9f7bee1 | 1192 | data = nfs_commit_alloc(); |
1da177e4 LT |
1193 | |
1194 | if (!data) | |
1195 | goto out_bad; | |
1196 | ||
1197 | /* Set up the argument struct */ | |
1198 | nfs_commit_rpcsetup(head, data, how); | |
1199 | ||
1200 | nfs_execute_write(data); | |
1201 | return 0; | |
1202 | out_bad: | |
1203 | while (!list_empty(head)) { | |
1204 | req = nfs_list_entry(head->next); | |
1205 | nfs_list_remove_request(req); | |
1206 | nfs_mark_request_commit(req); | |
83715ad5 | 1207 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
5c2d97cb | 1208 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1209 | } |
1210 | return -ENOMEM; | |
1211 | } | |
1212 | ||
1213 | /* | |
1214 | * COMMIT call returned | |
1215 | */ | |
788e7a89 | 1216 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1217 | { |
963d8fe5 | 1218 | struct nfs_write_data *data = calldata; |
1da177e4 | 1219 | struct nfs_page *req; |
1da177e4 | 1220 | |
a3f565b1 | 1221 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
1da177e4 LT |
1222 | task->tk_pid, task->tk_status); |
1223 | ||
788e7a89 TM |
1224 | /* Call the NFS version-specific code */ |
1225 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1226 | return; | |
1227 | ||
1da177e4 LT |
1228 | while (!list_empty(&data->pages)) { |
1229 | req = nfs_list_entry(data->pages.next); | |
1230 | nfs_list_remove_request(req); | |
612c9384 | 1231 | clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
fd39fc85 | 1232 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
1da177e4 LT |
1233 | |
1234 | dprintk("NFS: commit (%s/%Ld %d@%Ld)", | |
1235 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1236 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1237 | req->wb_bytes, | |
1238 | (long long)req_offset(req)); | |
1239 | if (task->tk_status < 0) { | |
1240 | req->wb_context->error = task->tk_status; | |
1241 | nfs_inode_remove_request(req); | |
1242 | dprintk(", error = %d\n", task->tk_status); | |
1243 | goto next; | |
1244 | } | |
1245 | ||
1246 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1247 | * returned by the server against all stored verfs. */ | |
1248 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1249 | /* We have a match */ | |
1250 | nfs_inode_remove_request(req); | |
1251 | dprintk(" OK\n"); | |
1252 | goto next; | |
1253 | } | |
1254 | /* We have a mismatch. Write the page again */ | |
1255 | dprintk(" mismatch\n"); | |
61822ab5 | 1256 | nfs_redirty_request(req); |
1da177e4 | 1257 | next: |
c6a556b8 | 1258 | nfs_clear_page_writeback(req); |
1da177e4 | 1259 | } |
1da177e4 | 1260 | } |
788e7a89 TM |
1261 | |
1262 | static const struct rpc_call_ops nfs_commit_ops = { | |
1263 | .rpc_call_done = nfs_commit_done, | |
1264 | .rpc_release = nfs_commit_release, | |
1265 | }; | |
1da177e4 | 1266 | |
3da28eb1 | 1267 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 LT |
1268 | { |
1269 | struct nfs_inode *nfsi = NFS_I(inode); | |
1270 | LIST_HEAD(head); | |
7d46a49f | 1271 | int res; |
1da177e4 LT |
1272 | |
1273 | spin_lock(&nfsi->req_lock); | |
3da28eb1 TM |
1274 | res = nfs_scan_commit(inode, &head, 0, 0); |
1275 | spin_unlock(&nfsi->req_lock); | |
1da177e4 | 1276 | if (res) { |
7d46a49f | 1277 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1278 | if (error < 0) |
1279 | return error; | |
1280 | } | |
1da177e4 LT |
1281 | return res; |
1282 | } | |
c63c7b05 TM |
1283 | #else |
1284 | static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) | |
1285 | { | |
1286 | return 0; | |
1287 | } | |
1da177e4 LT |
1288 | #endif |
1289 | ||
1c75950b | 1290 | long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1291 | { |
1c75950b | 1292 | struct inode *inode = mapping->host; |
c42de9dd | 1293 | struct nfs_inode *nfsi = NFS_I(inode); |
ca52fec1 | 1294 | pgoff_t idx_start, idx_end; |
1c75950b | 1295 | unsigned int npages = 0; |
c42de9dd | 1296 | LIST_HEAD(head); |
70b9ecbd | 1297 | int nocommit = how & FLUSH_NOCOMMIT; |
3f442547 | 1298 | long pages, ret; |
1da177e4 | 1299 | |
1c75950b TM |
1300 | /* FIXME */ |
1301 | if (wbc->range_cyclic) | |
1302 | idx_start = 0; | |
1303 | else { | |
1304 | idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1305 | idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1306 | if (idx_end > idx_start) { | |
ca52fec1 | 1307 | pgoff_t l_npages = 1 + idx_end - idx_start; |
1c75950b TM |
1308 | npages = l_npages; |
1309 | if (sizeof(npages) != sizeof(l_npages) && | |
ca52fec1 | 1310 | (pgoff_t)npages != l_npages) |
1c75950b TM |
1311 | npages = 0; |
1312 | } | |
1313 | } | |
c42de9dd TM |
1314 | how &= ~FLUSH_NOCOMMIT; |
1315 | spin_lock(&nfsi->req_lock); | |
1da177e4 | 1316 | do { |
c42de9dd TM |
1317 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); |
1318 | if (ret != 0) | |
70b9ecbd | 1319 | continue; |
c42de9dd TM |
1320 | if (nocommit) |
1321 | break; | |
d2ccddf0 | 1322 | pages = nfs_scan_commit(inode, &head, idx_start, npages); |
724c439c | 1323 | if (pages == 0) |
c42de9dd | 1324 | break; |
d2ccddf0 TM |
1325 | if (how & FLUSH_INVALIDATE) { |
1326 | spin_unlock(&nfsi->req_lock); | |
83715ad5 | 1327 | nfs_cancel_commit_list(&head); |
e8e058e8 | 1328 | ret = pages; |
d2ccddf0 TM |
1329 | spin_lock(&nfsi->req_lock); |
1330 | continue; | |
1331 | } | |
1332 | pages += nfs_scan_commit(inode, &head, 0, 0); | |
c42de9dd TM |
1333 | spin_unlock(&nfsi->req_lock); |
1334 | ret = nfs_commit_list(inode, &head, how); | |
1335 | spin_lock(&nfsi->req_lock); | |
1336 | } while (ret >= 0); | |
1337 | spin_unlock(&nfsi->req_lock); | |
1338 | return ret; | |
1da177e4 LT |
1339 | } |
1340 | ||
1c75950b TM |
1341 | /* |
1342 | * flush the inode to disk. | |
1343 | */ | |
1344 | int nfs_wb_all(struct inode *inode) | |
1345 | { | |
1346 | struct address_space *mapping = inode->i_mapping; | |
1347 | struct writeback_control wbc = { | |
1348 | .bdi = mapping->backing_dev_info, | |
1349 | .sync_mode = WB_SYNC_ALL, | |
1350 | .nr_to_write = LONG_MAX, | |
61822ab5 | 1351 | .for_writepages = 1, |
1c75950b TM |
1352 | .range_cyclic = 1, |
1353 | }; | |
1354 | int ret; | |
1355 | ||
c63c7b05 | 1356 | ret = nfs_writepages(mapping, &wbc); |
61822ab5 TM |
1357 | if (ret < 0) |
1358 | goto out; | |
1c75950b TM |
1359 | ret = nfs_sync_mapping_wait(mapping, &wbc, 0); |
1360 | if (ret >= 0) | |
1361 | return 0; | |
61822ab5 | 1362 | out: |
e507d9eb | 1363 | __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); |
1c75950b TM |
1364 | return ret; |
1365 | } | |
1366 | ||
1367 | int nfs_sync_mapping_range(struct address_space *mapping, loff_t range_start, loff_t range_end, int how) | |
1368 | { | |
1369 | struct writeback_control wbc = { | |
1370 | .bdi = mapping->backing_dev_info, | |
1371 | .sync_mode = WB_SYNC_ALL, | |
1372 | .nr_to_write = LONG_MAX, | |
1373 | .range_start = range_start, | |
1374 | .range_end = range_end, | |
61822ab5 | 1375 | .for_writepages = 1, |
1c75950b TM |
1376 | }; |
1377 | int ret; | |
1378 | ||
c63c7b05 TM |
1379 | ret = nfs_writepages(mapping, &wbc); |
1380 | if (ret < 0) | |
1381 | goto out; | |
1c75950b TM |
1382 | ret = nfs_sync_mapping_wait(mapping, &wbc, how); |
1383 | if (ret >= 0) | |
1384 | return 0; | |
61822ab5 | 1385 | out: |
e507d9eb | 1386 | __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); |
1c75950b TM |
1387 | return ret; |
1388 | } | |
1389 | ||
61822ab5 | 1390 | int nfs_wb_page_priority(struct inode *inode, struct page *page, int how) |
1c75950b TM |
1391 | { |
1392 | loff_t range_start = page_offset(page); | |
1393 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
4d770ccf TM |
1394 | struct writeback_control wbc = { |
1395 | .bdi = page->mapping->backing_dev_info, | |
1396 | .sync_mode = WB_SYNC_ALL, | |
1397 | .nr_to_write = LONG_MAX, | |
1398 | .range_start = range_start, | |
1399 | .range_end = range_end, | |
1400 | }; | |
1401 | int ret; | |
1c75950b | 1402 | |
4d770ccf | 1403 | BUG_ON(!PageLocked(page)); |
c63c7b05 | 1404 | if (clear_page_dirty_for_io(page)) { |
4d770ccf TM |
1405 | ret = nfs_writepage_locked(page, &wbc); |
1406 | if (ret < 0) | |
1407 | goto out; | |
1408 | } | |
f40313ac TM |
1409 | if (!PagePrivate(page)) |
1410 | return 0; | |
4d770ccf TM |
1411 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); |
1412 | if (ret >= 0) | |
1413 | return 0; | |
1414 | out: | |
e507d9eb | 1415 | __mark_inode_dirty(inode, I_DIRTY_PAGES); |
4d770ccf | 1416 | return ret; |
1c75950b TM |
1417 | } |
1418 | ||
1419 | /* | |
1420 | * Write back all requests on one page - we do this before reading it. | |
1421 | */ | |
1422 | int nfs_wb_page(struct inode *inode, struct page* page) | |
1423 | { | |
4d770ccf | 1424 | return nfs_wb_page_priority(inode, page, FLUSH_STABLE); |
1c75950b TM |
1425 | } |
1426 | ||
1a54533e TM |
1427 | int nfs_set_page_dirty(struct page *page) |
1428 | { | |
d585158b TM |
1429 | struct address_space *mapping = page->mapping; |
1430 | struct inode *inode; | |
1431 | spinlock_t *req_lock; | |
1a54533e | 1432 | struct nfs_page *req; |
2b82f190 | 1433 | int ret; |
1a54533e | 1434 | |
d585158b TM |
1435 | if (!mapping) |
1436 | goto out_raced; | |
1437 | inode = mapping->host; | |
1438 | if (!inode) | |
1439 | goto out_raced; | |
1440 | req_lock = &NFS_I(inode)->req_lock; | |
2b82f190 TM |
1441 | spin_lock(req_lock); |
1442 | req = nfs_page_find_request_locked(page); | |
1a54533e TM |
1443 | if (req != NULL) { |
1444 | /* Mark any existing write requests for flushing */ | |
2b82f190 TM |
1445 | ret = !test_and_set_bit(PG_NEED_FLUSH, &req->wb_flags); |
1446 | spin_unlock(req_lock); | |
1a54533e | 1447 | nfs_release_request(req); |
2b82f190 | 1448 | return ret; |
1a54533e | 1449 | } |
2b82f190 TM |
1450 | ret = __set_page_dirty_nobuffers(page); |
1451 | spin_unlock(req_lock); | |
1452 | return ret; | |
d585158b TM |
1453 | out_raced: |
1454 | return !TestSetPageDirty(page); | |
1a54533e TM |
1455 | } |
1456 | ||
1c75950b | 1457 | |
f7b422b1 | 1458 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1459 | { |
1460 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1461 | sizeof(struct nfs_write_data), | |
1462 | 0, SLAB_HWCACHE_ALIGN, | |
1463 | NULL, NULL); | |
1464 | if (nfs_wdata_cachep == NULL) | |
1465 | return -ENOMEM; | |
1466 | ||
93d2341c MD |
1467 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1468 | nfs_wdata_cachep); | |
1da177e4 LT |
1469 | if (nfs_wdata_mempool == NULL) |
1470 | return -ENOMEM; | |
1471 | ||
93d2341c MD |
1472 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1473 | nfs_wdata_cachep); | |
1da177e4 LT |
1474 | if (nfs_commit_mempool == NULL) |
1475 | return -ENOMEM; | |
1476 | ||
89a09141 PZ |
1477 | /* |
1478 | * NFS congestion size, scale with available memory. | |
1479 | * | |
1480 | * 64MB: 8192k | |
1481 | * 128MB: 11585k | |
1482 | * 256MB: 16384k | |
1483 | * 512MB: 23170k | |
1484 | * 1GB: 32768k | |
1485 | * 2GB: 46340k | |
1486 | * 4GB: 65536k | |
1487 | * 8GB: 92681k | |
1488 | * 16GB: 131072k | |
1489 | * | |
1490 | * This allows larger machines to have larger/more transfers. | |
1491 | * Limit the default to 256M | |
1492 | */ | |
1493 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); | |
1494 | if (nfs_congestion_kb > 256*1024) | |
1495 | nfs_congestion_kb = 256*1024; | |
1496 | ||
1da177e4 LT |
1497 | return 0; |
1498 | } | |
1499 | ||
266bee88 | 1500 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1501 | { |
1502 | mempool_destroy(nfs_commit_mempool); | |
1503 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1504 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1505 | } |
1506 |