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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> |
074cc1de | 16 | #include <linux/migrate.h> |
1da177e4 LT |
17 | |
18 | #include <linux/sunrpc/clnt.h> | |
19 | #include <linux/nfs_fs.h> | |
20 | #include <linux/nfs_mount.h> | |
21 | #include <linux/nfs_page.h> | |
3fcfab16 | 22 | #include <linux/backing-dev.h> |
afeacc8c | 23 | #include <linux/export.h> |
3fcfab16 | 24 | |
1da177e4 | 25 | #include <asm/uaccess.h> |
1da177e4 LT |
26 | |
27 | #include "delegation.h" | |
49a70f27 | 28 | #include "internal.h" |
91d5b470 | 29 | #include "iostat.h" |
def6ed7e | 30 | #include "nfs4_fs.h" |
074cc1de | 31 | #include "fscache.h" |
94ad1c80 | 32 | #include "pnfs.h" |
1da177e4 | 33 | |
f4ce1299 TM |
34 | #include "nfstrace.h" |
35 | ||
1da177e4 LT |
36 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE |
37 | ||
38 | #define MIN_POOL_WRITE (32) | |
39 | #define MIN_POOL_COMMIT (4) | |
40 | ||
41 | /* | |
42 | * Local function declarations | |
43 | */ | |
f8512ad0 | 44 | static void nfs_redirty_request(struct nfs_page *req); |
788e7a89 | 45 | static const struct rpc_call_ops nfs_commit_ops; |
061ae2ed | 46 | static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops; |
f453a54a | 47 | static const struct nfs_commit_completion_ops nfs_commit_completion_ops; |
4a0de55c | 48 | static const struct nfs_rw_ops nfs_rw_write_ops; |
1da177e4 | 49 | |
e18b890b | 50 | static struct kmem_cache *nfs_wdata_cachep; |
3feb2d49 | 51 | static mempool_t *nfs_wdata_mempool; |
0b7c0153 | 52 | static struct kmem_cache *nfs_cdata_cachep; |
1da177e4 LT |
53 | static mempool_t *nfs_commit_mempool; |
54 | ||
0b7c0153 | 55 | struct nfs_commit_data *nfs_commitdata_alloc(void) |
1da177e4 | 56 | { |
192e501b | 57 | struct nfs_commit_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOIO); |
40859d7e | 58 | |
1da177e4 LT |
59 | if (p) { |
60 | memset(p, 0, sizeof(*p)); | |
61 | INIT_LIST_HEAD(&p->pages); | |
62 | } | |
63 | return p; | |
64 | } | |
e0c2b380 | 65 | EXPORT_SYMBOL_GPL(nfs_commitdata_alloc); |
1da177e4 | 66 | |
0b7c0153 | 67 | void nfs_commit_free(struct nfs_commit_data *p) |
1da177e4 LT |
68 | { |
69 | mempool_free(p, nfs_commit_mempool); | |
70 | } | |
e0c2b380 | 71 | EXPORT_SYMBOL_GPL(nfs_commit_free); |
1da177e4 | 72 | |
4a0de55c | 73 | static struct nfs_rw_header *nfs_writehdr_alloc(void) |
3feb2d49 | 74 | { |
c0752cdf | 75 | struct nfs_rw_header *p = mempool_alloc(nfs_wdata_mempool, GFP_NOIO); |
cd841605 | 76 | |
4a0de55c | 77 | if (p) |
3feb2d49 | 78 | memset(p, 0, sizeof(*p)); |
3feb2d49 TM |
79 | return p; |
80 | } | |
6c75dc0d | 81 | |
4a0de55c | 82 | static void nfs_writehdr_free(struct nfs_rw_header *whdr) |
3feb2d49 | 83 | { |
cd841605 | 84 | mempool_free(whdr, nfs_wdata_mempool); |
3feb2d49 | 85 | } |
1da177e4 | 86 | |
7b159fc1 TM |
87 | static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error) |
88 | { | |
89 | ctx->error = error; | |
90 | smp_wmb(); | |
91 | set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
92 | } | |
93 | ||
29418aa4 MG |
94 | static struct nfs_page * |
95 | nfs_page_find_request_locked(struct nfs_inode *nfsi, struct page *page) | |
277459d2 TM |
96 | { |
97 | struct nfs_page *req = NULL; | |
98 | ||
29418aa4 | 99 | if (PagePrivate(page)) |
277459d2 | 100 | req = (struct nfs_page *)page_private(page); |
29418aa4 MG |
101 | else if (unlikely(PageSwapCache(page))) { |
102 | struct nfs_page *freq, *t; | |
103 | ||
104 | /* Linearly search the commit list for the correct req */ | |
105 | list_for_each_entry_safe(freq, t, &nfsi->commit_info.list, wb_list) { | |
106 | if (freq->wb_page == page) { | |
107 | req = freq; | |
108 | break; | |
109 | } | |
110 | } | |
277459d2 | 111 | } |
29418aa4 MG |
112 | |
113 | if (req) | |
114 | kref_get(&req->wb_kref); | |
115 | ||
277459d2 TM |
116 | return req; |
117 | } | |
118 | ||
119 | static struct nfs_page *nfs_page_find_request(struct page *page) | |
120 | { | |
d56b4ddf | 121 | struct inode *inode = page_file_mapping(page)->host; |
277459d2 | 122 | struct nfs_page *req = NULL; |
277459d2 | 123 | |
587142f8 | 124 | spin_lock(&inode->i_lock); |
29418aa4 | 125 | req = nfs_page_find_request_locked(NFS_I(inode), page); |
587142f8 | 126 | spin_unlock(&inode->i_lock); |
277459d2 TM |
127 | return req; |
128 | } | |
129 | ||
1da177e4 LT |
130 | /* Adjust the file length if we're writing beyond the end */ |
131 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) | |
132 | { | |
d56b4ddf | 133 | struct inode *inode = page_file_mapping(page)->host; |
a3d01454 TM |
134 | loff_t end, i_size; |
135 | pgoff_t end_index; | |
1da177e4 | 136 | |
a3d01454 TM |
137 | spin_lock(&inode->i_lock); |
138 | i_size = i_size_read(inode); | |
139 | end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; | |
d56b4ddf | 140 | if (i_size > 0 && page_file_index(page) < end_index) |
a3d01454 | 141 | goto out; |
d56b4ddf | 142 | end = page_file_offset(page) + ((loff_t)offset+count); |
1da177e4 | 143 | if (i_size >= end) |
a3d01454 | 144 | goto out; |
1da177e4 | 145 | i_size_write(inode, end); |
a3d01454 TM |
146 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
147 | out: | |
148 | spin_unlock(&inode->i_lock); | |
1da177e4 LT |
149 | } |
150 | ||
a301b777 TM |
151 | /* A writeback failed: mark the page as bad, and invalidate the page cache */ |
152 | static void nfs_set_pageerror(struct page *page) | |
153 | { | |
d56b4ddf | 154 | nfs_zap_mapping(page_file_mapping(page)->host, page_file_mapping(page)); |
a301b777 TM |
155 | } |
156 | ||
d72ddcba WAA |
157 | /* |
158 | * nfs_page_group_search_locked | |
159 | * @head - head request of page group | |
160 | * @page_offset - offset into page | |
161 | * | |
162 | * Search page group with head @head to find a request that contains the | |
163 | * page offset @page_offset. | |
164 | * | |
165 | * Returns a pointer to the first matching nfs request, or NULL if no | |
166 | * match is found. | |
167 | * | |
168 | * Must be called with the page group lock held | |
169 | */ | |
170 | static struct nfs_page * | |
171 | nfs_page_group_search_locked(struct nfs_page *head, unsigned int page_offset) | |
172 | { | |
173 | struct nfs_page *req; | |
174 | ||
175 | WARN_ON_ONCE(head != head->wb_head); | |
176 | WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &head->wb_head->wb_flags)); | |
177 | ||
178 | req = head; | |
179 | do { | |
180 | if (page_offset >= req->wb_pgbase && | |
181 | page_offset < (req->wb_pgbase + req->wb_bytes)) | |
182 | return req; | |
183 | ||
184 | req = req->wb_this_page; | |
185 | } while (req != head); | |
186 | ||
187 | return NULL; | |
188 | } | |
189 | ||
190 | /* | |
191 | * nfs_page_group_covers_page | |
192 | * @head - head request of page group | |
193 | * | |
194 | * Return true if the page group with head @head covers the whole page, | |
195 | * returns false otherwise | |
196 | */ | |
197 | static bool nfs_page_group_covers_page(struct nfs_page *req) | |
198 | { | |
199 | struct nfs_page *tmp; | |
200 | unsigned int pos = 0; | |
201 | unsigned int len = nfs_page_length(req->wb_page); | |
202 | ||
203 | nfs_page_group_lock(req); | |
204 | ||
205 | do { | |
206 | tmp = nfs_page_group_search_locked(req->wb_head, pos); | |
207 | if (tmp) { | |
208 | /* no way this should happen */ | |
209 | WARN_ON_ONCE(tmp->wb_pgbase != pos); | |
210 | pos += tmp->wb_bytes - (pos - tmp->wb_pgbase); | |
211 | } | |
212 | } while (tmp && pos < len); | |
213 | ||
214 | nfs_page_group_unlock(req); | |
215 | WARN_ON_ONCE(pos > len); | |
216 | return pos == len; | |
217 | } | |
218 | ||
1da177e4 LT |
219 | /* We can set the PG_uptodate flag if we see that a write request |
220 | * covers the full page. | |
221 | */ | |
d72ddcba | 222 | static void nfs_mark_uptodate(struct nfs_page *req) |
1da177e4 | 223 | { |
d72ddcba | 224 | if (PageUptodate(req->wb_page)) |
1da177e4 | 225 | return; |
d72ddcba | 226 | if (!nfs_page_group_covers_page(req)) |
1da177e4 | 227 | return; |
d72ddcba | 228 | SetPageUptodate(req->wb_page); |
1da177e4 LT |
229 | } |
230 | ||
1da177e4 LT |
231 | static int wb_priority(struct writeback_control *wbc) |
232 | { | |
233 | if (wbc->for_reclaim) | |
c63c7b05 | 234 | return FLUSH_HIGHPRI | FLUSH_STABLE; |
b17621fe | 235 | if (wbc->for_kupdate || wbc->for_background) |
b31268ac TM |
236 | return FLUSH_LOWPRI | FLUSH_COND_STABLE; |
237 | return FLUSH_COND_STABLE; | |
1da177e4 LT |
238 | } |
239 | ||
89a09141 PZ |
240 | /* |
241 | * NFS congestion control | |
242 | */ | |
243 | ||
244 | int nfs_congestion_kb; | |
245 | ||
246 | #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) | |
247 | #define NFS_CONGESTION_OFF_THRESH \ | |
248 | (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) | |
249 | ||
deed85e7 | 250 | static void nfs_set_page_writeback(struct page *page) |
89a09141 | 251 | { |
deed85e7 | 252 | struct nfs_server *nfss = NFS_SERVER(page_file_mapping(page)->host); |
5a6d41b3 TM |
253 | int ret = test_set_page_writeback(page); |
254 | ||
deed85e7 | 255 | WARN_ON_ONCE(ret != 0); |
89a09141 | 256 | |
deed85e7 TM |
257 | if (atomic_long_inc_return(&nfss->writeback) > |
258 | NFS_CONGESTION_ON_THRESH) { | |
259 | set_bdi_congested(&nfss->backing_dev_info, | |
260 | BLK_RW_ASYNC); | |
89a09141 PZ |
261 | } |
262 | } | |
263 | ||
20633f04 | 264 | static void nfs_end_page_writeback(struct nfs_page *req) |
89a09141 | 265 | { |
20633f04 | 266 | struct inode *inode = page_file_mapping(req->wb_page)->host; |
89a09141 PZ |
267 | struct nfs_server *nfss = NFS_SERVER(inode); |
268 | ||
20633f04 WAA |
269 | if (!nfs_page_group_sync_on_bit(req, PG_WB_END)) |
270 | return; | |
271 | ||
272 | end_page_writeback(req->wb_page); | |
c4dc4bee | 273 | if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) |
8aa7e847 | 274 | clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC); |
89a09141 PZ |
275 | } |
276 | ||
cfb506e1 | 277 | static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock) |
e261f51f | 278 | { |
d56b4ddf | 279 | struct inode *inode = page_file_mapping(page)->host; |
e261f51f | 280 | struct nfs_page *req; |
e261f51f TM |
281 | int ret; |
282 | ||
587142f8 | 283 | spin_lock(&inode->i_lock); |
074cc1de | 284 | for (;;) { |
29418aa4 | 285 | req = nfs_page_find_request_locked(NFS_I(inode), page); |
074cc1de TM |
286 | if (req == NULL) |
287 | break; | |
7ad84aa9 | 288 | if (nfs_lock_request(req)) |
e261f51f TM |
289 | break; |
290 | /* Note: If we hold the page lock, as is the case in nfs_writepage, | |
7ad84aa9 | 291 | * then the call to nfs_lock_request() will always |
e261f51f TM |
292 | * succeed provided that someone hasn't already marked the |
293 | * request as dirty (in which case we don't care). | |
294 | */ | |
587142f8 | 295 | spin_unlock(&inode->i_lock); |
cfb506e1 TM |
296 | if (!nonblock) |
297 | ret = nfs_wait_on_request(req); | |
298 | else | |
299 | ret = -EAGAIN; | |
e261f51f TM |
300 | nfs_release_request(req); |
301 | if (ret != 0) | |
074cc1de | 302 | return ERR_PTR(ret); |
587142f8 | 303 | spin_lock(&inode->i_lock); |
e261f51f | 304 | } |
587142f8 | 305 | spin_unlock(&inode->i_lock); |
074cc1de TM |
306 | return req; |
307 | } | |
308 | ||
309 | /* | |
310 | * Find an associated nfs write request, and prepare to flush it out | |
311 | * May return an error if the user signalled nfs_wait_on_request(). | |
312 | */ | |
313 | static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, | |
cfb506e1 | 314 | struct page *page, bool nonblock) |
074cc1de TM |
315 | { |
316 | struct nfs_page *req; | |
317 | int ret = 0; | |
318 | ||
cfb506e1 | 319 | req = nfs_find_and_lock_request(page, nonblock); |
074cc1de TM |
320 | if (!req) |
321 | goto out; | |
322 | ret = PTR_ERR(req); | |
323 | if (IS_ERR(req)) | |
324 | goto out; | |
325 | ||
deed85e7 TM |
326 | nfs_set_page_writeback(page); |
327 | WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags)); | |
074cc1de | 328 | |
deed85e7 | 329 | ret = 0; |
f8512ad0 FI |
330 | if (!nfs_pageio_add_request(pgio, req)) { |
331 | nfs_redirty_request(req); | |
074cc1de | 332 | ret = pgio->pg_error; |
f8512ad0 | 333 | } |
074cc1de TM |
334 | out: |
335 | return ret; | |
e261f51f TM |
336 | } |
337 | ||
f758c885 | 338 | static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) |
1da177e4 | 339 | { |
d56b4ddf | 340 | struct inode *inode = page_file_mapping(page)->host; |
cfb506e1 | 341 | int ret; |
1da177e4 | 342 | |
91d5b470 CL |
343 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
344 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
345 | ||
d56b4ddf | 346 | nfs_pageio_cond_complete(pgio, page_file_index(page)); |
1b430bee | 347 | ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE); |
cfb506e1 TM |
348 | if (ret == -EAGAIN) { |
349 | redirty_page_for_writepage(wbc, page); | |
350 | ret = 0; | |
351 | } | |
352 | return ret; | |
f758c885 | 353 | } |
7fe7f848 | 354 | |
f758c885 TM |
355 | /* |
356 | * Write an mmapped page to the server. | |
357 | */ | |
358 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
359 | { | |
360 | struct nfs_pageio_descriptor pgio; | |
361 | int err; | |
49a70f27 | 362 | |
a20c93e3 CH |
363 | nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc), |
364 | false, &nfs_async_write_completion_ops); | |
f758c885 TM |
365 | err = nfs_do_writepage(page, wbc, &pgio); |
366 | nfs_pageio_complete(&pgio); | |
367 | if (err < 0) | |
368 | return err; | |
369 | if (pgio.pg_error < 0) | |
370 | return pgio.pg_error; | |
371 | return 0; | |
4d770ccf TM |
372 | } |
373 | ||
374 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
375 | { | |
f758c885 | 376 | int ret; |
4d770ccf | 377 | |
f758c885 | 378 | ret = nfs_writepage_locked(page, wbc); |
1da177e4 | 379 | unlock_page(page); |
f758c885 TM |
380 | return ret; |
381 | } | |
382 | ||
383 | static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) | |
384 | { | |
385 | int ret; | |
386 | ||
387 | ret = nfs_do_writepage(page, wbc, data); | |
388 | unlock_page(page); | |
389 | return ret; | |
1da177e4 LT |
390 | } |
391 | ||
1da177e4 LT |
392 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) |
393 | { | |
1da177e4 | 394 | struct inode *inode = mapping->host; |
72cb77f4 | 395 | unsigned long *bitlock = &NFS_I(inode)->flags; |
c63c7b05 | 396 | struct nfs_pageio_descriptor pgio; |
1da177e4 LT |
397 | int err; |
398 | ||
72cb77f4 TM |
399 | /* Stop dirtying of new pages while we sync */ |
400 | err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING, | |
401 | nfs_wait_bit_killable, TASK_KILLABLE); | |
402 | if (err) | |
403 | goto out_err; | |
404 | ||
91d5b470 CL |
405 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
406 | ||
a20c93e3 CH |
407 | nfs_pageio_init_write(&pgio, inode, wb_priority(wbc), false, |
408 | &nfs_async_write_completion_ops); | |
f758c885 | 409 | err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); |
c63c7b05 | 410 | nfs_pageio_complete(&pgio); |
72cb77f4 TM |
411 | |
412 | clear_bit_unlock(NFS_INO_FLUSHING, bitlock); | |
4e857c58 | 413 | smp_mb__after_atomic(); |
72cb77f4 TM |
414 | wake_up_bit(bitlock, NFS_INO_FLUSHING); |
415 | ||
f758c885 | 416 | if (err < 0) |
72cb77f4 TM |
417 | goto out_err; |
418 | err = pgio.pg_error; | |
419 | if (err < 0) | |
420 | goto out_err; | |
c63c7b05 | 421 | return 0; |
72cb77f4 TM |
422 | out_err: |
423 | return err; | |
1da177e4 LT |
424 | } |
425 | ||
426 | /* | |
427 | * Insert a write request into an inode | |
428 | */ | |
d6d6dc7c | 429 | static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req) |
1da177e4 LT |
430 | { |
431 | struct nfs_inode *nfsi = NFS_I(inode); | |
e7d39069 | 432 | |
2bfc6e56 WAA |
433 | WARN_ON_ONCE(req->wb_this_page != req); |
434 | ||
e7d39069 | 435 | /* Lock the request! */ |
7ad84aa9 | 436 | nfs_lock_request(req); |
e7d39069 TM |
437 | |
438 | spin_lock(&inode->i_lock); | |
011e2a7f | 439 | if (!nfsi->npages && NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE)) |
a9a4a87a | 440 | inode->i_version++; |
29418aa4 MG |
441 | /* |
442 | * Swap-space should not get truncated. Hence no need to plug the race | |
443 | * with invalidate/truncate. | |
444 | */ | |
445 | if (likely(!PageSwapCache(req->wb_page))) { | |
446 | set_bit(PG_MAPPED, &req->wb_flags); | |
447 | SetPagePrivate(req->wb_page); | |
448 | set_page_private(req->wb_page, (unsigned long)req); | |
449 | } | |
1da177e4 | 450 | nfsi->npages++; |
17089a29 WAA |
451 | /* this a head request for a page group - mark it as having an |
452 | * extra reference so sub groups can follow suit */ | |
453 | WARN_ON(test_and_set_bit(PG_INODE_REF, &req->wb_flags)); | |
c03b4024 | 454 | kref_get(&req->wb_kref); |
e7d39069 | 455 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
456 | } |
457 | ||
458 | /* | |
89a09141 | 459 | * Remove a write request from an inode |
1da177e4 LT |
460 | */ |
461 | static void nfs_inode_remove_request(struct nfs_page *req) | |
462 | { | |
3d4ff43d | 463 | struct inode *inode = req->wb_context->dentry->d_inode; |
1da177e4 | 464 | struct nfs_inode *nfsi = NFS_I(inode); |
20633f04 | 465 | struct nfs_page *head; |
1da177e4 | 466 | |
20633f04 WAA |
467 | if (nfs_page_group_sync_on_bit(req, PG_REMOVE)) { |
468 | head = req->wb_head; | |
469 | ||
470 | spin_lock(&inode->i_lock); | |
471 | if (likely(!PageSwapCache(head->wb_page))) { | |
472 | set_page_private(head->wb_page, 0); | |
473 | ClearPagePrivate(head->wb_page); | |
474 | clear_bit(PG_MAPPED, &head->wb_flags); | |
475 | } | |
476 | nfsi->npages--; | |
477 | spin_unlock(&inode->i_lock); | |
29418aa4 | 478 | } |
17089a29 WAA |
479 | |
480 | if (test_and_clear_bit(PG_INODE_REF, &req->wb_flags)) | |
481 | nfs_release_request(req); | |
1da177e4 LT |
482 | } |
483 | ||
61822ab5 | 484 | static void |
6d884e8f | 485 | nfs_mark_request_dirty(struct nfs_page *req) |
61822ab5 | 486 | { |
61822ab5 TM |
487 | __set_page_dirty_nobuffers(req->wb_page); |
488 | } | |
489 | ||
89d77c8f | 490 | #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) |
8dd37758 TM |
491 | /** |
492 | * nfs_request_add_commit_list - add request to a commit list | |
493 | * @req: pointer to a struct nfs_page | |
ea2cf228 FI |
494 | * @dst: commit list head |
495 | * @cinfo: holds list lock and accounting info | |
8dd37758 | 496 | * |
ea2cf228 | 497 | * This sets the PG_CLEAN bit, updates the cinfo count of |
8dd37758 TM |
498 | * number of outstanding requests requiring a commit as well as |
499 | * the MM page stats. | |
500 | * | |
ea2cf228 | 501 | * The caller must _not_ hold the cinfo->lock, but must be |
8dd37758 | 502 | * holding the nfs_page lock. |
1da177e4 | 503 | */ |
8dd37758 | 504 | void |
ea2cf228 FI |
505 | nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst, |
506 | struct nfs_commit_info *cinfo) | |
1da177e4 | 507 | { |
e468bae9 | 508 | set_bit(PG_CLEAN, &(req)->wb_flags); |
ea2cf228 FI |
509 | spin_lock(cinfo->lock); |
510 | nfs_list_add_request(req, dst); | |
511 | cinfo->mds->ncommit++; | |
512 | spin_unlock(cinfo->lock); | |
56f9cd68 FI |
513 | if (!cinfo->dreq) { |
514 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); | |
d56b4ddf | 515 | inc_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info, |
56f9cd68 FI |
516 | BDI_RECLAIMABLE); |
517 | __mark_inode_dirty(req->wb_context->dentry->d_inode, | |
518 | I_DIRTY_DATASYNC); | |
519 | } | |
1da177e4 | 520 | } |
8dd37758 TM |
521 | EXPORT_SYMBOL_GPL(nfs_request_add_commit_list); |
522 | ||
523 | /** | |
524 | * nfs_request_remove_commit_list - Remove request from a commit list | |
525 | * @req: pointer to a nfs_page | |
ea2cf228 | 526 | * @cinfo: holds list lock and accounting info |
8dd37758 | 527 | * |
ea2cf228 | 528 | * This clears the PG_CLEAN bit, and updates the cinfo's count of |
8dd37758 TM |
529 | * number of outstanding requests requiring a commit |
530 | * It does not update the MM page stats. | |
531 | * | |
ea2cf228 | 532 | * The caller _must_ hold the cinfo->lock and the nfs_page lock. |
8dd37758 TM |
533 | */ |
534 | void | |
ea2cf228 FI |
535 | nfs_request_remove_commit_list(struct nfs_page *req, |
536 | struct nfs_commit_info *cinfo) | |
8dd37758 | 537 | { |
8dd37758 TM |
538 | if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) |
539 | return; | |
540 | nfs_list_remove_request(req); | |
ea2cf228 | 541 | cinfo->mds->ncommit--; |
8dd37758 TM |
542 | } |
543 | EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list); | |
544 | ||
ea2cf228 FI |
545 | static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo, |
546 | struct inode *inode) | |
547 | { | |
548 | cinfo->lock = &inode->i_lock; | |
549 | cinfo->mds = &NFS_I(inode)->commit_info; | |
550 | cinfo->ds = pnfs_get_ds_info(inode); | |
b359f9d0 | 551 | cinfo->dreq = NULL; |
f453a54a | 552 | cinfo->completion_ops = &nfs_commit_completion_ops; |
ea2cf228 FI |
553 | } |
554 | ||
555 | void nfs_init_cinfo(struct nfs_commit_info *cinfo, | |
556 | struct inode *inode, | |
557 | struct nfs_direct_req *dreq) | |
558 | { | |
1763da12 FI |
559 | if (dreq) |
560 | nfs_init_cinfo_from_dreq(cinfo, dreq); | |
561 | else | |
562 | nfs_init_cinfo_from_inode(cinfo, inode); | |
ea2cf228 FI |
563 | } |
564 | EXPORT_SYMBOL_GPL(nfs_init_cinfo); | |
8dd37758 TM |
565 | |
566 | /* | |
567 | * Add a request to the inode's commit list. | |
568 | */ | |
1763da12 | 569 | void |
ea2cf228 FI |
570 | nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, |
571 | struct nfs_commit_info *cinfo) | |
8dd37758 | 572 | { |
ea2cf228 | 573 | if (pnfs_mark_request_commit(req, lseg, cinfo)) |
8dd37758 | 574 | return; |
ea2cf228 | 575 | nfs_request_add_commit_list(req, &cinfo->mds->list, cinfo); |
8dd37758 | 576 | } |
8e821cad | 577 | |
d6d6dc7c FI |
578 | static void |
579 | nfs_clear_page_commit(struct page *page) | |
580 | { | |
581 | dec_zone_page_state(page, NR_UNSTABLE_NFS); | |
d56b4ddf | 582 | dec_bdi_stat(page_file_mapping(page)->backing_dev_info, BDI_RECLAIMABLE); |
d6d6dc7c FI |
583 | } |
584 | ||
8dd37758 | 585 | static void |
e468bae9 TM |
586 | nfs_clear_request_commit(struct nfs_page *req) |
587 | { | |
8dd37758 TM |
588 | if (test_bit(PG_CLEAN, &req->wb_flags)) { |
589 | struct inode *inode = req->wb_context->dentry->d_inode; | |
ea2cf228 | 590 | struct nfs_commit_info cinfo; |
e468bae9 | 591 | |
ea2cf228 FI |
592 | nfs_init_cinfo_from_inode(&cinfo, inode); |
593 | if (!pnfs_clear_request_commit(req, &cinfo)) { | |
594 | spin_lock(cinfo.lock); | |
595 | nfs_request_remove_commit_list(req, &cinfo); | |
596 | spin_unlock(cinfo.lock); | |
8dd37758 | 597 | } |
d6d6dc7c | 598 | nfs_clear_page_commit(req->wb_page); |
e468bae9 | 599 | } |
e468bae9 TM |
600 | } |
601 | ||
8e821cad | 602 | static inline |
9c7e1b3d | 603 | int nfs_write_need_commit(struct nfs_pgio_data *data) |
8e821cad | 604 | { |
465d5243 | 605 | if (data->verf.committed == NFS_DATA_SYNC) |
cd841605 FI |
606 | return data->header->lseg == NULL; |
607 | return data->verf.committed != NFS_FILE_SYNC; | |
8e821cad TM |
608 | } |
609 | ||
8e821cad | 610 | #else |
68cd6fa4 BS |
611 | static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo, |
612 | struct inode *inode) | |
613 | { | |
614 | } | |
615 | ||
616 | void nfs_init_cinfo(struct nfs_commit_info *cinfo, | |
617 | struct inode *inode, | |
618 | struct nfs_direct_req *dreq) | |
619 | { | |
620 | } | |
621 | ||
1763da12 | 622 | void |
ea2cf228 FI |
623 | nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, |
624 | struct nfs_commit_info *cinfo) | |
8e821cad TM |
625 | { |
626 | } | |
627 | ||
8dd37758 | 628 | static void |
e468bae9 TM |
629 | nfs_clear_request_commit(struct nfs_page *req) |
630 | { | |
e468bae9 TM |
631 | } |
632 | ||
8e821cad | 633 | static inline |
9c7e1b3d | 634 | int nfs_write_need_commit(struct nfs_pgio_data *data) |
8e821cad TM |
635 | { |
636 | return 0; | |
637 | } | |
638 | ||
6c75dc0d FI |
639 | #endif |
640 | ||
061ae2ed | 641 | static void nfs_write_completion(struct nfs_pgio_header *hdr) |
8e821cad | 642 | { |
ea2cf228 | 643 | struct nfs_commit_info cinfo; |
6c75dc0d | 644 | unsigned long bytes = 0; |
2bfc6e56 | 645 | bool do_destroy; |
6c75dc0d FI |
646 | |
647 | if (test_bit(NFS_IOHDR_REDO, &hdr->flags)) | |
648 | goto out; | |
ea2cf228 | 649 | nfs_init_cinfo_from_inode(&cinfo, hdr->inode); |
6c75dc0d FI |
650 | while (!list_empty(&hdr->pages)) { |
651 | struct nfs_page *req = nfs_list_entry(hdr->pages.next); | |
6c75dc0d FI |
652 | |
653 | bytes += req->wb_bytes; | |
654 | nfs_list_remove_request(req); | |
655 | if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) && | |
656 | (hdr->good_bytes < bytes)) { | |
d1182b33 | 657 | nfs_set_pageerror(req->wb_page); |
6c75dc0d FI |
658 | nfs_context_set_write_error(req->wb_context, hdr->error); |
659 | goto remove_req; | |
660 | } | |
661 | if (test_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags)) { | |
662 | nfs_mark_request_dirty(req); | |
663 | goto next; | |
664 | } | |
665 | if (test_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags)) { | |
f79d06f5 | 666 | memcpy(&req->wb_verf, &hdr->verf.verifier, sizeof(req->wb_verf)); |
ea2cf228 | 667 | nfs_mark_request_commit(req, hdr->lseg, &cinfo); |
6c75dc0d FI |
668 | goto next; |
669 | } | |
670 | remove_req: | |
671 | nfs_inode_remove_request(req); | |
672 | next: | |
1d1afcbc | 673 | nfs_unlock_request(req); |
20633f04 | 674 | nfs_end_page_writeback(req); |
2bfc6e56 | 675 | do_destroy = !test_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags); |
3aff4ebb | 676 | nfs_release_request(req); |
6c75dc0d FI |
677 | } |
678 | out: | |
679 | hdr->release(hdr); | |
8e821cad | 680 | } |
1da177e4 | 681 | |
89d77c8f | 682 | #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) |
ce59515c | 683 | unsigned long |
ea2cf228 | 684 | nfs_reqs_to_commit(struct nfs_commit_info *cinfo) |
fb8a1f11 | 685 | { |
ea2cf228 | 686 | return cinfo->mds->ncommit; |
d6d6dc7c FI |
687 | } |
688 | ||
ea2cf228 | 689 | /* cinfo->lock held by caller */ |
1763da12 | 690 | int |
ea2cf228 FI |
691 | nfs_scan_commit_list(struct list_head *src, struct list_head *dst, |
692 | struct nfs_commit_info *cinfo, int max) | |
d6d6dc7c FI |
693 | { |
694 | struct nfs_page *req, *tmp; | |
695 | int ret = 0; | |
696 | ||
697 | list_for_each_entry_safe(req, tmp, src, wb_list) { | |
8dd37758 TM |
698 | if (!nfs_lock_request(req)) |
699 | continue; | |
7ad84aa9 | 700 | kref_get(&req->wb_kref); |
ea2cf228 | 701 | if (cond_resched_lock(cinfo->lock)) |
3b3be88d | 702 | list_safe_reset_next(req, tmp, wb_list); |
ea2cf228 | 703 | nfs_request_remove_commit_list(req, cinfo); |
8dd37758 TM |
704 | nfs_list_add_request(req, dst); |
705 | ret++; | |
1763da12 | 706 | if ((ret == max) && !cinfo->dreq) |
8dd37758 | 707 | break; |
d6d6dc7c FI |
708 | } |
709 | return ret; | |
fb8a1f11 TM |
710 | } |
711 | ||
1da177e4 LT |
712 | /* |
713 | * nfs_scan_commit - Scan an inode for commit requests | |
714 | * @inode: NFS inode to scan | |
ea2cf228 FI |
715 | * @dst: mds destination list |
716 | * @cinfo: mds and ds lists of reqs ready to commit | |
1da177e4 LT |
717 | * |
718 | * Moves requests from the inode's 'commit' request list. | |
719 | * The requests are *not* checked to ensure that they form a contiguous set. | |
720 | */ | |
1763da12 | 721 | int |
ea2cf228 FI |
722 | nfs_scan_commit(struct inode *inode, struct list_head *dst, |
723 | struct nfs_commit_info *cinfo) | |
1da177e4 | 724 | { |
d6d6dc7c | 725 | int ret = 0; |
fb8a1f11 | 726 | |
ea2cf228 FI |
727 | spin_lock(cinfo->lock); |
728 | if (cinfo->mds->ncommit > 0) { | |
8dd37758 | 729 | const int max = INT_MAX; |
d6d6dc7c | 730 | |
ea2cf228 FI |
731 | ret = nfs_scan_commit_list(&cinfo->mds->list, dst, |
732 | cinfo, max); | |
733 | ret += pnfs_scan_commit_lists(inode, cinfo, max - ret); | |
d6d6dc7c | 734 | } |
ea2cf228 | 735 | spin_unlock(cinfo->lock); |
ff778d02 | 736 | return ret; |
1da177e4 | 737 | } |
d6d6dc7c | 738 | |
c42de9dd | 739 | #else |
ce59515c | 740 | unsigned long nfs_reqs_to_commit(struct nfs_commit_info *cinfo) |
fb8a1f11 TM |
741 | { |
742 | return 0; | |
743 | } | |
744 | ||
1763da12 FI |
745 | int nfs_scan_commit(struct inode *inode, struct list_head *dst, |
746 | struct nfs_commit_info *cinfo) | |
c42de9dd TM |
747 | { |
748 | return 0; | |
749 | } | |
1da177e4 LT |
750 | #endif |
751 | ||
1da177e4 | 752 | /* |
e7d39069 TM |
753 | * Search for an existing write request, and attempt to update |
754 | * it to reflect a new dirty region on a given page. | |
1da177e4 | 755 | * |
e7d39069 TM |
756 | * If the attempt fails, then the existing request is flushed out |
757 | * to disk. | |
1da177e4 | 758 | */ |
e7d39069 TM |
759 | static struct nfs_page *nfs_try_to_update_request(struct inode *inode, |
760 | struct page *page, | |
761 | unsigned int offset, | |
762 | unsigned int bytes) | |
1da177e4 | 763 | { |
e7d39069 TM |
764 | struct nfs_page *req; |
765 | unsigned int rqend; | |
766 | unsigned int end; | |
767 | int error; | |
768 | ||
769 | if (!PagePrivate(page)) | |
770 | return NULL; | |
1da177e4 LT |
771 | |
772 | end = offset + bytes; | |
e7d39069 | 773 | spin_lock(&inode->i_lock); |
1da177e4 | 774 | |
1da177e4 | 775 | for (;;) { |
29418aa4 | 776 | req = nfs_page_find_request_locked(NFS_I(inode), page); |
e7d39069 TM |
777 | if (req == NULL) |
778 | goto out_unlock; | |
779 | ||
2bfc6e56 WAA |
780 | /* should be handled by nfs_flush_incompatible */ |
781 | WARN_ON_ONCE(req->wb_head != req); | |
782 | WARN_ON_ONCE(req->wb_this_page != req); | |
783 | ||
e7d39069 TM |
784 | rqend = req->wb_offset + req->wb_bytes; |
785 | /* | |
786 | * Tell the caller to flush out the request if | |
787 | * the offsets are non-contiguous. | |
788 | * Note: nfs_flush_incompatible() will already | |
789 | * have flushed out requests having wrong owners. | |
790 | */ | |
e468bae9 | 791 | if (offset > rqend |
e7d39069 TM |
792 | || end < req->wb_offset) |
793 | goto out_flushme; | |
794 | ||
7ad84aa9 | 795 | if (nfs_lock_request(req)) |
1da177e4 | 796 | break; |
1da177e4 | 797 | |
e7d39069 | 798 | /* The request is locked, so wait and then retry */ |
587142f8 | 799 | spin_unlock(&inode->i_lock); |
e7d39069 TM |
800 | error = nfs_wait_on_request(req); |
801 | nfs_release_request(req); | |
802 | if (error != 0) | |
803 | goto out_err; | |
804 | spin_lock(&inode->i_lock); | |
1da177e4 LT |
805 | } |
806 | ||
807 | /* Okay, the request matches. Update the region */ | |
808 | if (offset < req->wb_offset) { | |
809 | req->wb_offset = offset; | |
810 | req->wb_pgbase = offset; | |
1da177e4 | 811 | } |
1da177e4 LT |
812 | if (end > rqend) |
813 | req->wb_bytes = end - req->wb_offset; | |
e7d39069 TM |
814 | else |
815 | req->wb_bytes = rqend - req->wb_offset; | |
816 | out_unlock: | |
817 | spin_unlock(&inode->i_lock); | |
ca138f36 FI |
818 | if (req) |
819 | nfs_clear_request_commit(req); | |
e7d39069 TM |
820 | return req; |
821 | out_flushme: | |
822 | spin_unlock(&inode->i_lock); | |
823 | nfs_release_request(req); | |
824 | error = nfs_wb_page(inode, page); | |
825 | out_err: | |
826 | return ERR_PTR(error); | |
827 | } | |
828 | ||
829 | /* | |
830 | * Try to update an existing write request, or create one if there is none. | |
831 | * | |
832 | * Note: Should always be called with the Page Lock held to prevent races | |
833 | * if we have to add a new request. Also assumes that the caller has | |
834 | * already called nfs_flush_incompatible() if necessary. | |
835 | */ | |
836 | static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx, | |
837 | struct page *page, unsigned int offset, unsigned int bytes) | |
838 | { | |
d56b4ddf | 839 | struct inode *inode = page_file_mapping(page)->host; |
e7d39069 | 840 | struct nfs_page *req; |
1da177e4 | 841 | |
e7d39069 TM |
842 | req = nfs_try_to_update_request(inode, page, offset, bytes); |
843 | if (req != NULL) | |
844 | goto out; | |
2bfc6e56 | 845 | req = nfs_create_request(ctx, page, NULL, offset, bytes); |
e7d39069 TM |
846 | if (IS_ERR(req)) |
847 | goto out; | |
d6d6dc7c | 848 | nfs_inode_add_request(inode, req); |
efc91ed0 | 849 | out: |
61e930a9 | 850 | return req; |
1da177e4 LT |
851 | } |
852 | ||
e7d39069 TM |
853 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
854 | unsigned int offset, unsigned int count) | |
855 | { | |
856 | struct nfs_page *req; | |
857 | ||
858 | req = nfs_setup_write_request(ctx, page, offset, count); | |
859 | if (IS_ERR(req)) | |
860 | return PTR_ERR(req); | |
861 | /* Update file length */ | |
862 | nfs_grow_file(page, offset, count); | |
d72ddcba | 863 | nfs_mark_uptodate(req); |
a6305ddb | 864 | nfs_mark_request_dirty(req); |
1d1afcbc | 865 | nfs_unlock_and_release_request(req); |
e7d39069 TM |
866 | return 0; |
867 | } | |
868 | ||
1da177e4 LT |
869 | int nfs_flush_incompatible(struct file *file, struct page *page) |
870 | { | |
cd3758e3 | 871 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
2a369153 | 872 | struct nfs_lock_context *l_ctx; |
1da177e4 | 873 | struct nfs_page *req; |
1a54533e | 874 | int do_flush, status; |
1da177e4 LT |
875 | /* |
876 | * Look for a request corresponding to this page. If there | |
877 | * is one, and it belongs to another file, we flush it out | |
878 | * before we try to copy anything into the page. Do this | |
879 | * due to the lack of an ACCESS-type call in NFSv2. | |
880 | * Also do the same if we find a request from an existing | |
881 | * dropped page. | |
882 | */ | |
1a54533e TM |
883 | do { |
884 | req = nfs_page_find_request(page); | |
885 | if (req == NULL) | |
886 | return 0; | |
2a369153 TM |
887 | l_ctx = req->wb_lock_context; |
888 | do_flush = req->wb_page != page || req->wb_context != ctx; | |
2bfc6e56 WAA |
889 | /* for now, flush if more than 1 request in page_group */ |
890 | do_flush |= req->wb_this_page != req; | |
0f1d2605 | 891 | if (l_ctx && ctx->dentry->d_inode->i_flock != NULL) { |
2a369153 TM |
892 | do_flush |= l_ctx->lockowner.l_owner != current->files |
893 | || l_ctx->lockowner.l_pid != current->tgid; | |
894 | } | |
1da177e4 | 895 | nfs_release_request(req); |
1a54533e TM |
896 | if (!do_flush) |
897 | return 0; | |
d56b4ddf | 898 | status = nfs_wb_page(page_file_mapping(page)->host, page); |
1a54533e TM |
899 | } while (status == 0); |
900 | return status; | |
1da177e4 LT |
901 | } |
902 | ||
dc24826b AA |
903 | /* |
904 | * Avoid buffered writes when a open context credential's key would | |
905 | * expire soon. | |
906 | * | |
907 | * Returns -EACCES if the key will expire within RPC_KEY_EXPIRE_FAIL. | |
908 | * | |
909 | * Return 0 and set a credential flag which triggers the inode to flush | |
910 | * and performs NFS_FILE_SYNC writes if the key will expired within | |
911 | * RPC_KEY_EXPIRE_TIMEO. | |
912 | */ | |
913 | int | |
914 | nfs_key_timeout_notify(struct file *filp, struct inode *inode) | |
915 | { | |
916 | struct nfs_open_context *ctx = nfs_file_open_context(filp); | |
917 | struct rpc_auth *auth = NFS_SERVER(inode)->client->cl_auth; | |
918 | ||
919 | return rpcauth_key_timeout_notify(auth, ctx->cred); | |
920 | } | |
921 | ||
922 | /* | |
923 | * Test if the open context credential key is marked to expire soon. | |
924 | */ | |
925 | bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx) | |
926 | { | |
927 | return rpcauth_cred_key_to_expire(ctx->cred); | |
928 | } | |
929 | ||
5d47a356 TM |
930 | /* |
931 | * If the page cache is marked as unsafe or invalid, then we can't rely on | |
932 | * the PageUptodate() flag. In this case, we will need to turn off | |
933 | * write optimisations that depend on the page contents being correct. | |
934 | */ | |
8d197a56 | 935 | static bool nfs_write_pageuptodate(struct page *page, struct inode *inode) |
5d47a356 | 936 | { |
d529ef83 JL |
937 | struct nfs_inode *nfsi = NFS_I(inode); |
938 | ||
8d197a56 TM |
939 | if (nfs_have_delegated_attributes(inode)) |
940 | goto out; | |
18dd78c4 | 941 | if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) |
d529ef83 | 942 | return false; |
4db72b40 | 943 | smp_rmb(); |
d529ef83 | 944 | if (test_bit(NFS_INO_INVALIDATING, &nfsi->flags)) |
8d197a56 TM |
945 | return false; |
946 | out: | |
18dd78c4 SM |
947 | if (nfsi->cache_validity & NFS_INO_INVALID_DATA) |
948 | return false; | |
8d197a56 | 949 | return PageUptodate(page) != 0; |
5d47a356 TM |
950 | } |
951 | ||
c7559663 SM |
952 | /* If we know the page is up to date, and we're not using byte range locks (or |
953 | * if we have the whole file locked for writing), it may be more efficient to | |
954 | * extend the write to cover the entire page in order to avoid fragmentation | |
955 | * inefficiencies. | |
956 | * | |
263b4509 SM |
957 | * If the file is opened for synchronous writes then we can just skip the rest |
958 | * of the checks. | |
c7559663 SM |
959 | */ |
960 | static int nfs_can_extend_write(struct file *file, struct page *page, struct inode *inode) | |
961 | { | |
962 | if (file->f_flags & O_DSYNC) | |
963 | return 0; | |
263b4509 SM |
964 | if (!nfs_write_pageuptodate(page, inode)) |
965 | return 0; | |
c7559663 SM |
966 | if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE)) |
967 | return 1; | |
263b4509 | 968 | if (inode->i_flock == NULL || (inode->i_flock->fl_start == 0 && |
c7559663 | 969 | inode->i_flock->fl_end == OFFSET_MAX && |
263b4509 | 970 | inode->i_flock->fl_type != F_RDLCK)) |
c7559663 SM |
971 | return 1; |
972 | return 0; | |
973 | } | |
974 | ||
1da177e4 LT |
975 | /* |
976 | * Update and possibly write a cached page of an NFS file. | |
977 | * | |
978 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
979 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
980 | */ | |
981 | int nfs_updatepage(struct file *file, struct page *page, | |
982 | unsigned int offset, unsigned int count) | |
983 | { | |
cd3758e3 | 984 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
d56b4ddf | 985 | struct inode *inode = page_file_mapping(page)->host; |
1da177e4 LT |
986 | int status = 0; |
987 | ||
91d5b470 CL |
988 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
989 | ||
6de1472f AV |
990 | dprintk("NFS: nfs_updatepage(%pD2 %d@%lld)\n", |
991 | file, count, (long long)(page_file_offset(page) + offset)); | |
1da177e4 | 992 | |
c7559663 | 993 | if (nfs_can_extend_write(file, page, inode)) { |
49a70f27 | 994 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 995 | offset = 0; |
1da177e4 LT |
996 | } |
997 | ||
e21195a7 | 998 | status = nfs_writepage_setup(ctx, page, offset, count); |
03fa9e84 TM |
999 | if (status < 0) |
1000 | nfs_set_pageerror(page); | |
59b7c05f TM |
1001 | else |
1002 | __set_page_dirty_nobuffers(page); | |
1da177e4 | 1003 | |
48186c7d | 1004 | dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n", |
1da177e4 | 1005 | status, (long long)i_size_read(inode)); |
1da177e4 LT |
1006 | return status; |
1007 | } | |
1008 | ||
3ff7576d | 1009 | static int flush_task_priority(int how) |
1da177e4 LT |
1010 | { |
1011 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
1012 | case FLUSH_HIGHPRI: | |
1013 | return RPC_PRIORITY_HIGH; | |
1014 | case FLUSH_LOWPRI: | |
1015 | return RPC_PRIORITY_LOW; | |
1016 | } | |
1017 | return RPC_PRIORITY_NORMAL; | |
1018 | } | |
1019 | ||
1ed26f33 AS |
1020 | static void nfs_initiate_write(struct nfs_pgio_data *data, struct rpc_message *msg, |
1021 | struct rpc_task_setup *task_setup_data, int how) | |
1da177e4 | 1022 | { |
cd841605 | 1023 | struct inode *inode = data->header->inode; |
3ff7576d | 1024 | int priority = flush_task_priority(how); |
d138d5d1 | 1025 | |
1ed26f33 AS |
1026 | task_setup_data->priority = priority; |
1027 | NFS_PROTO(inode)->write_setup(data, msg); | |
d138d5d1 | 1028 | |
8c21c62c | 1029 | nfs4_state_protect_write(NFS_SERVER(inode)->nfs_client, |
1ed26f33 | 1030 | &task_setup_data->rpc_client, msg, data); |
275acaaf TM |
1031 | } |
1032 | ||
6d884e8f F |
1033 | /* If a nfs_flush_* function fails, it should remove reqs from @head and |
1034 | * call this on each, which will prepare them to be retried on next | |
1035 | * writeback using standard nfs. | |
1036 | */ | |
1037 | static void nfs_redirty_request(struct nfs_page *req) | |
1038 | { | |
1039 | nfs_mark_request_dirty(req); | |
1d1afcbc | 1040 | nfs_unlock_request(req); |
20633f04 | 1041 | nfs_end_page_writeback(req); |
3aff4ebb | 1042 | nfs_release_request(req); |
6d884e8f F |
1043 | } |
1044 | ||
061ae2ed | 1045 | static void nfs_async_write_error(struct list_head *head) |
6c75dc0d FI |
1046 | { |
1047 | struct nfs_page *req; | |
1048 | ||
1049 | while (!list_empty(head)) { | |
1050 | req = nfs_list_entry(head->next); | |
1051 | nfs_list_remove_request(req); | |
1052 | nfs_redirty_request(req); | |
1053 | } | |
1054 | } | |
1055 | ||
061ae2ed FI |
1056 | static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = { |
1057 | .error_cleanup = nfs_async_write_error, | |
1058 | .completion = nfs_write_completion, | |
1059 | }; | |
1060 | ||
57208fa7 | 1061 | void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, |
a20c93e3 | 1062 | struct inode *inode, int ioflags, bool force_mds, |
061ae2ed | 1063 | const struct nfs_pgio_completion_ops *compl_ops) |
1da177e4 | 1064 | { |
a20c93e3 | 1065 | struct nfs_server *server = NFS_SERVER(inode); |
41d8d5b7 | 1066 | const struct nfs_pageio_ops *pg_ops = &nfs_pgio_rw_ops; |
a20c93e3 CH |
1067 | |
1068 | #ifdef CONFIG_NFS_V4_1 | |
1069 | if (server->pnfs_curr_ld && !force_mds) | |
1070 | pg_ops = server->pnfs_curr_ld->pg_write_ops; | |
1071 | #endif | |
4a0de55c AS |
1072 | nfs_pageio_init(pgio, inode, pg_ops, compl_ops, &nfs_rw_write_ops, |
1073 | server->wsize, ioflags); | |
1751c363 | 1074 | } |
ddda8e0a | 1075 | EXPORT_SYMBOL_GPL(nfs_pageio_init_write); |
1da177e4 | 1076 | |
dce81290 TM |
1077 | void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio) |
1078 | { | |
41d8d5b7 | 1079 | pgio->pg_ops = &nfs_pgio_rw_ops; |
dce81290 TM |
1080 | pgio->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize; |
1081 | } | |
1f945357 | 1082 | EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds); |
dce81290 | 1083 | |
1da177e4 | 1084 | |
0b7c0153 FI |
1085 | void nfs_commit_prepare(struct rpc_task *task, void *calldata) |
1086 | { | |
1087 | struct nfs_commit_data *data = calldata; | |
1088 | ||
1089 | NFS_PROTO(data->inode)->commit_rpc_prepare(task, data); | |
1090 | } | |
1091 | ||
a4cdda59 | 1092 | static void nfs_writeback_release_common(struct nfs_pgio_data *data) |
c9d8f89d | 1093 | { |
cd841605 | 1094 | struct nfs_pgio_header *hdr = data->header; |
e2fecb21 | 1095 | int status = data->task.tk_status; |
788e7a89 | 1096 | |
6c75dc0d FI |
1097 | if ((status >= 0) && nfs_write_need_commit(data)) { |
1098 | spin_lock(&hdr->lock); | |
1099 | if (test_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags)) | |
1100 | ; /* Do nothing */ | |
1101 | else if (!test_and_set_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags)) | |
f79d06f5 AS |
1102 | memcpy(&hdr->verf, &data->verf, sizeof(hdr->verf)); |
1103 | else if (memcmp(&hdr->verf, &data->verf, sizeof(hdr->verf))) | |
6c75dc0d FI |
1104 | set_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags); |
1105 | spin_unlock(&hdr->lock); | |
1da177e4 LT |
1106 | } |
1107 | } | |
1108 | ||
1f2edbe3 TM |
1109 | /* |
1110 | * Special version of should_remove_suid() that ignores capabilities. | |
1111 | */ | |
1112 | static int nfs_should_remove_suid(const struct inode *inode) | |
1113 | { | |
1114 | umode_t mode = inode->i_mode; | |
1115 | int kill = 0; | |
1116 | ||
1117 | /* suid always must be killed */ | |
1118 | if (unlikely(mode & S_ISUID)) | |
1119 | kill = ATTR_KILL_SUID; | |
788e7a89 | 1120 | |
1f2edbe3 TM |
1121 | /* |
1122 | * sgid without any exec bits is just a mandatory locking mark; leave | |
1123 | * it alone. If some exec bits are set, it's a real sgid; kill it. | |
1124 | */ | |
1125 | if (unlikely((mode & S_ISGID) && (mode & S_IXGRP))) | |
1126 | kill |= ATTR_KILL_SGID; | |
1127 | ||
1128 | if (unlikely(kill && S_ISREG(mode))) | |
1129 | return kill; | |
1130 | ||
1131 | return 0; | |
1132 | } | |
788e7a89 | 1133 | |
1da177e4 LT |
1134 | /* |
1135 | * This function is called when the WRITE call is complete. | |
1136 | */ | |
0eecb214 AS |
1137 | static int nfs_writeback_done(struct rpc_task *task, struct nfs_pgio_data *data, |
1138 | struct inode *inode) | |
1da177e4 | 1139 | { |
788e7a89 | 1140 | int status; |
1da177e4 | 1141 | |
f551e44f CL |
1142 | /* |
1143 | * ->write_done will attempt to use post-op attributes to detect | |
1144 | * conflicting writes by other clients. A strict interpretation | |
1145 | * of close-to-open would allow us to continue caching even if | |
1146 | * another writer had changed the file, but some applications | |
1147 | * depend on tighter cache coherency when writing. | |
1148 | */ | |
cd841605 | 1149 | status = NFS_PROTO(inode)->write_done(task, data); |
788e7a89 | 1150 | if (status != 0) |
0eecb214 AS |
1151 | return status; |
1152 | nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, data->res.count); | |
91d5b470 | 1153 | |
89d77c8f | 1154 | #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) |
0eecb214 | 1155 | if (data->res.verf->committed < data->args.stable && task->tk_status >= 0) { |
1da177e4 LT |
1156 | /* We tried a write call, but the server did not |
1157 | * commit data to stable storage even though we | |
1158 | * requested it. | |
1159 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1160 | * the server reports NFS_DATA_SYNC, but performs | |
1161 | * NFS_FILE_SYNC. We therefore implement this checking | |
1162 | * as a dprintk() in order to avoid filling syslog. | |
1163 | */ | |
1164 | static unsigned long complain; | |
1165 | ||
a69aef14 | 1166 | /* Note this will print the MDS for a DS write */ |
1da177e4 | 1167 | if (time_before(complain, jiffies)) { |
48186c7d | 1168 | dprintk("NFS: faulty NFS server %s:" |
1da177e4 | 1169 | " (committed = %d) != (stable = %d)\n", |
cd841605 | 1170 | NFS_SERVER(inode)->nfs_client->cl_hostname, |
0eecb214 | 1171 | data->res.verf->committed, data->args.stable); |
1da177e4 LT |
1172 | complain = jiffies + 300 * HZ; |
1173 | } | |
1174 | } | |
1175 | #endif | |
1f2edbe3 TM |
1176 | |
1177 | /* Deal with the suid/sgid bit corner case */ | |
1178 | if (nfs_should_remove_suid(inode)) | |
1179 | nfs_mark_for_revalidate(inode); | |
0eecb214 AS |
1180 | return 0; |
1181 | } | |
1182 | ||
1183 | /* | |
1184 | * This function is called when the WRITE call is complete. | |
1185 | */ | |
1186 | static void nfs_writeback_result(struct rpc_task *task, struct nfs_pgio_data *data) | |
1187 | { | |
1188 | struct nfs_pgio_args *argp = &data->args; | |
1189 | struct nfs_pgio_res *resp = &data->res; | |
1f2edbe3 TM |
1190 | |
1191 | if (resp->count < argp->count) { | |
1da177e4 LT |
1192 | static unsigned long complain; |
1193 | ||
6c75dc0d | 1194 | /* This a short write! */ |
0eecb214 | 1195 | nfs_inc_stats(data->header->inode, NFSIOS_SHORTWRITE); |
91d5b470 | 1196 | |
1da177e4 | 1197 | /* Has the server at least made some progress? */ |
6c75dc0d FI |
1198 | if (resp->count == 0) { |
1199 | if (time_before(complain, jiffies)) { | |
1200 | printk(KERN_WARNING | |
1201 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1202 | argp->count); | |
1203 | complain = jiffies + 300 * HZ; | |
1da177e4 | 1204 | } |
6c75dc0d FI |
1205 | nfs_set_pgio_error(data->header, -EIO, argp->offset); |
1206 | task->tk_status = -EIO; | |
13602896 | 1207 | return; |
1da177e4 | 1208 | } |
6c75dc0d FI |
1209 | /* Was this an NFSv2 write or an NFSv3 stable write? */ |
1210 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1211 | /* Resend from where the server left off */ | |
1212 | data->mds_offset += resp->count; | |
1213 | argp->offset += resp->count; | |
1214 | argp->pgbase += resp->count; | |
1215 | argp->count -= resp->count; | |
1216 | } else { | |
1217 | /* Resend as a stable write in order to avoid | |
1218 | * headaches in the case of a server crash. | |
1219 | */ | |
1220 | argp->stable = NFS_FILE_SYNC; | |
1da177e4 | 1221 | } |
6c75dc0d | 1222 | rpc_restart_call_prepare(task); |
1da177e4 | 1223 | } |
1da177e4 LT |
1224 | } |
1225 | ||
1226 | ||
89d77c8f | 1227 | #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) |
71d0a611 TM |
1228 | static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait) |
1229 | { | |
b8413f98 TM |
1230 | int ret; |
1231 | ||
71d0a611 TM |
1232 | if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags)) |
1233 | return 1; | |
b8413f98 TM |
1234 | if (!may_wait) |
1235 | return 0; | |
1236 | ret = out_of_line_wait_on_bit_lock(&nfsi->flags, | |
1237 | NFS_INO_COMMIT, | |
1238 | nfs_wait_bit_killable, | |
1239 | TASK_KILLABLE); | |
1240 | return (ret < 0) ? ret : 1; | |
71d0a611 TM |
1241 | } |
1242 | ||
f453a54a | 1243 | static void nfs_commit_clear_lock(struct nfs_inode *nfsi) |
71d0a611 TM |
1244 | { |
1245 | clear_bit(NFS_INO_COMMIT, &nfsi->flags); | |
4e857c58 | 1246 | smp_mb__after_atomic(); |
71d0a611 TM |
1247 | wake_up_bit(&nfsi->flags, NFS_INO_COMMIT); |
1248 | } | |
1249 | ||
0b7c0153 | 1250 | void nfs_commitdata_release(struct nfs_commit_data *data) |
1da177e4 | 1251 | { |
0b7c0153 FI |
1252 | put_nfs_open_context(data->context); |
1253 | nfs_commit_free(data); | |
1da177e4 | 1254 | } |
e0c2b380 | 1255 | EXPORT_SYMBOL_GPL(nfs_commitdata_release); |
1da177e4 | 1256 | |
0b7c0153 | 1257 | int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data, |
9ace33cd | 1258 | const struct rpc_call_ops *call_ops, |
9f0ec176 | 1259 | int how, int flags) |
1da177e4 | 1260 | { |
07737691 | 1261 | struct rpc_task *task; |
9ace33cd | 1262 | int priority = flush_task_priority(how); |
bdc7f021 TM |
1263 | struct rpc_message msg = { |
1264 | .rpc_argp = &data->args, | |
1265 | .rpc_resp = &data->res, | |
9ace33cd | 1266 | .rpc_cred = data->cred, |
bdc7f021 | 1267 | }; |
84115e1c | 1268 | struct rpc_task_setup task_setup_data = { |
07737691 | 1269 | .task = &data->task, |
9ace33cd | 1270 | .rpc_client = clnt, |
bdc7f021 | 1271 | .rpc_message = &msg, |
9ace33cd | 1272 | .callback_ops = call_ops, |
84115e1c | 1273 | .callback_data = data, |
101070ca | 1274 | .workqueue = nfsiod_workqueue, |
9f0ec176 | 1275 | .flags = RPC_TASK_ASYNC | flags, |
3ff7576d | 1276 | .priority = priority, |
84115e1c | 1277 | }; |
9ace33cd FI |
1278 | /* Set up the initial task struct. */ |
1279 | NFS_PROTO(data->inode)->commit_setup(data, &msg); | |
1280 | ||
1281 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); | |
1282 | ||
8c21c62c WAA |
1283 | nfs4_state_protect(NFS_SERVER(data->inode)->nfs_client, |
1284 | NFS_SP4_MACH_CRED_COMMIT, &task_setup_data.rpc_client, &msg); | |
1285 | ||
9ace33cd FI |
1286 | task = rpc_run_task(&task_setup_data); |
1287 | if (IS_ERR(task)) | |
1288 | return PTR_ERR(task); | |
1289 | if (how & FLUSH_SYNC) | |
1290 | rpc_wait_for_completion_task(task); | |
1291 | rpc_put_task(task); | |
1292 | return 0; | |
1293 | } | |
e0c2b380 | 1294 | EXPORT_SYMBOL_GPL(nfs_initiate_commit); |
9ace33cd FI |
1295 | |
1296 | /* | |
1297 | * Set up the argument/result storage required for the RPC call. | |
1298 | */ | |
0b7c0153 | 1299 | void nfs_init_commit(struct nfs_commit_data *data, |
f453a54a FI |
1300 | struct list_head *head, |
1301 | struct pnfs_layout_segment *lseg, | |
1302 | struct nfs_commit_info *cinfo) | |
9ace33cd FI |
1303 | { |
1304 | struct nfs_page *first = nfs_list_entry(head->next); | |
3d4ff43d | 1305 | struct inode *inode = first->wb_context->dentry->d_inode; |
1da177e4 LT |
1306 | |
1307 | /* Set up the RPC argument and reply structs | |
1308 | * NB: take care not to mess about with data->commit et al. */ | |
1309 | ||
1310 | list_splice_init(head, &data->pages); | |
1da177e4 | 1311 | |
1da177e4 | 1312 | data->inode = inode; |
9ace33cd | 1313 | data->cred = first->wb_context->cred; |
988b6dce | 1314 | data->lseg = lseg; /* reference transferred */ |
9ace33cd | 1315 | data->mds_ops = &nfs_commit_ops; |
f453a54a | 1316 | data->completion_ops = cinfo->completion_ops; |
b359f9d0 | 1317 | data->dreq = cinfo->dreq; |
1da177e4 LT |
1318 | |
1319 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1320 | /* Note: we always request a commit of the entire inode */ |
1321 | data->args.offset = 0; | |
1322 | data->args.count = 0; | |
0b7c0153 | 1323 | data->context = get_nfs_open_context(first->wb_context); |
1da177e4 LT |
1324 | data->res.fattr = &data->fattr; |
1325 | data->res.verf = &data->verf; | |
0e574af1 | 1326 | nfs_fattr_init(&data->fattr); |
1da177e4 | 1327 | } |
e0c2b380 | 1328 | EXPORT_SYMBOL_GPL(nfs_init_commit); |
1da177e4 | 1329 | |
e0c2b380 | 1330 | void nfs_retry_commit(struct list_head *page_list, |
ea2cf228 FI |
1331 | struct pnfs_layout_segment *lseg, |
1332 | struct nfs_commit_info *cinfo) | |
64bfeb49 FI |
1333 | { |
1334 | struct nfs_page *req; | |
1335 | ||
1336 | while (!list_empty(page_list)) { | |
1337 | req = nfs_list_entry(page_list->next); | |
1338 | nfs_list_remove_request(req); | |
ea2cf228 | 1339 | nfs_mark_request_commit(req, lseg, cinfo); |
56f9cd68 FI |
1340 | if (!cinfo->dreq) { |
1341 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); | |
d56b4ddf | 1342 | dec_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info, |
56f9cd68 FI |
1343 | BDI_RECLAIMABLE); |
1344 | } | |
1d1afcbc | 1345 | nfs_unlock_and_release_request(req); |
64bfeb49 FI |
1346 | } |
1347 | } | |
e0c2b380 | 1348 | EXPORT_SYMBOL_GPL(nfs_retry_commit); |
64bfeb49 | 1349 | |
1da177e4 LT |
1350 | /* |
1351 | * Commit dirty pages | |
1352 | */ | |
1353 | static int | |
ea2cf228 FI |
1354 | nfs_commit_list(struct inode *inode, struct list_head *head, int how, |
1355 | struct nfs_commit_info *cinfo) | |
1da177e4 | 1356 | { |
0b7c0153 | 1357 | struct nfs_commit_data *data; |
1da177e4 | 1358 | |
c9d8f89d | 1359 | data = nfs_commitdata_alloc(); |
1da177e4 LT |
1360 | |
1361 | if (!data) | |
1362 | goto out_bad; | |
1363 | ||
1364 | /* Set up the argument struct */ | |
f453a54a FI |
1365 | nfs_init_commit(data, head, NULL, cinfo); |
1366 | atomic_inc(&cinfo->mds->rpcs_out); | |
9f0ec176 AA |
1367 | return nfs_initiate_commit(NFS_CLIENT(inode), data, data->mds_ops, |
1368 | how, 0); | |
1da177e4 | 1369 | out_bad: |
ea2cf228 | 1370 | nfs_retry_commit(head, NULL, cinfo); |
f453a54a | 1371 | cinfo->completion_ops->error_cleanup(NFS_I(inode)); |
1da177e4 LT |
1372 | return -ENOMEM; |
1373 | } | |
1374 | ||
1375 | /* | |
1376 | * COMMIT call returned | |
1377 | */ | |
788e7a89 | 1378 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1379 | { |
0b7c0153 | 1380 | struct nfs_commit_data *data = calldata; |
1da177e4 | 1381 | |
a3f565b1 | 1382 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
1da177e4 LT |
1383 | task->tk_pid, task->tk_status); |
1384 | ||
788e7a89 | 1385 | /* Call the NFS version-specific code */ |
c0d0e96b | 1386 | NFS_PROTO(data->inode)->commit_done(task, data); |
c9d8f89d TM |
1387 | } |
1388 | ||
f453a54a | 1389 | static void nfs_commit_release_pages(struct nfs_commit_data *data) |
c9d8f89d | 1390 | { |
5917ce84 | 1391 | struct nfs_page *req; |
c9d8f89d | 1392 | int status = data->task.tk_status; |
f453a54a | 1393 | struct nfs_commit_info cinfo; |
788e7a89 | 1394 | |
1da177e4 LT |
1395 | while (!list_empty(&data->pages)) { |
1396 | req = nfs_list_entry(data->pages.next); | |
1397 | nfs_list_remove_request(req); | |
d6d6dc7c | 1398 | nfs_clear_page_commit(req->wb_page); |
1da177e4 | 1399 | |
1e8968c5 | 1400 | dprintk("NFS: commit (%s/%llu %d@%lld)", |
3d4ff43d | 1401 | req->wb_context->dentry->d_sb->s_id, |
1e8968c5 | 1402 | (unsigned long long)NFS_FILEID(req->wb_context->dentry->d_inode), |
1da177e4 LT |
1403 | req->wb_bytes, |
1404 | (long long)req_offset(req)); | |
c9d8f89d TM |
1405 | if (status < 0) { |
1406 | nfs_context_set_write_error(req->wb_context, status); | |
1da177e4 | 1407 | nfs_inode_remove_request(req); |
c9d8f89d | 1408 | dprintk(", error = %d\n", status); |
1da177e4 LT |
1409 | goto next; |
1410 | } | |
1411 | ||
1412 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1413 | * returned by the server against all stored verfs. */ | |
2f2c63bc | 1414 | if (!memcmp(&req->wb_verf, &data->verf.verifier, sizeof(req->wb_verf))) { |
1da177e4 LT |
1415 | /* We have a match */ |
1416 | nfs_inode_remove_request(req); | |
1417 | dprintk(" OK\n"); | |
1418 | goto next; | |
1419 | } | |
1420 | /* We have a mismatch. Write the page again */ | |
1421 | dprintk(" mismatch\n"); | |
6d884e8f | 1422 | nfs_mark_request_dirty(req); |
05990d1b | 1423 | set_bit(NFS_CONTEXT_RESEND_WRITES, &req->wb_context->flags); |
1da177e4 | 1424 | next: |
1d1afcbc | 1425 | nfs_unlock_and_release_request(req); |
1da177e4 | 1426 | } |
f453a54a FI |
1427 | nfs_init_cinfo(&cinfo, data->inode, data->dreq); |
1428 | if (atomic_dec_and_test(&cinfo.mds->rpcs_out)) | |
1429 | nfs_commit_clear_lock(NFS_I(data->inode)); | |
5917ce84 FI |
1430 | } |
1431 | ||
1432 | static void nfs_commit_release(void *calldata) | |
1433 | { | |
0b7c0153 | 1434 | struct nfs_commit_data *data = calldata; |
5917ce84 | 1435 | |
f453a54a | 1436 | data->completion_ops->completion(data); |
c9d8f89d | 1437 | nfs_commitdata_release(calldata); |
1da177e4 | 1438 | } |
788e7a89 TM |
1439 | |
1440 | static const struct rpc_call_ops nfs_commit_ops = { | |
0b7c0153 | 1441 | .rpc_call_prepare = nfs_commit_prepare, |
788e7a89 TM |
1442 | .rpc_call_done = nfs_commit_done, |
1443 | .rpc_release = nfs_commit_release, | |
1444 | }; | |
1da177e4 | 1445 | |
f453a54a FI |
1446 | static const struct nfs_commit_completion_ops nfs_commit_completion_ops = { |
1447 | .completion = nfs_commit_release_pages, | |
1448 | .error_cleanup = nfs_commit_clear_lock, | |
1449 | }; | |
1450 | ||
1763da12 FI |
1451 | int nfs_generic_commit_list(struct inode *inode, struct list_head *head, |
1452 | int how, struct nfs_commit_info *cinfo) | |
84c53ab5 FI |
1453 | { |
1454 | int status; | |
1455 | ||
ea2cf228 | 1456 | status = pnfs_commit_list(inode, head, how, cinfo); |
84c53ab5 | 1457 | if (status == PNFS_NOT_ATTEMPTED) |
ea2cf228 | 1458 | status = nfs_commit_list(inode, head, how, cinfo); |
84c53ab5 FI |
1459 | return status; |
1460 | } | |
1461 | ||
b608b283 | 1462 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 | 1463 | { |
1da177e4 | 1464 | LIST_HEAD(head); |
ea2cf228 | 1465 | struct nfs_commit_info cinfo; |
71d0a611 | 1466 | int may_wait = how & FLUSH_SYNC; |
b8413f98 | 1467 | int res; |
1da177e4 | 1468 | |
b8413f98 TM |
1469 | res = nfs_commit_set_lock(NFS_I(inode), may_wait); |
1470 | if (res <= 0) | |
c5efa5fc | 1471 | goto out_mark_dirty; |
ea2cf228 FI |
1472 | nfs_init_cinfo_from_inode(&cinfo, inode); |
1473 | res = nfs_scan_commit(inode, &head, &cinfo); | |
1da177e4 | 1474 | if (res) { |
a861a1e1 FI |
1475 | int error; |
1476 | ||
ea2cf228 | 1477 | error = nfs_generic_commit_list(inode, &head, how, &cinfo); |
3da28eb1 TM |
1478 | if (error < 0) |
1479 | return error; | |
b8413f98 | 1480 | if (!may_wait) |
c5efa5fc | 1481 | goto out_mark_dirty; |
b8413f98 TM |
1482 | error = wait_on_bit(&NFS_I(inode)->flags, |
1483 | NFS_INO_COMMIT, | |
1484 | nfs_wait_bit_killable, | |
1485 | TASK_KILLABLE); | |
1486 | if (error < 0) | |
1487 | return error; | |
71d0a611 TM |
1488 | } else |
1489 | nfs_commit_clear_lock(NFS_I(inode)); | |
c5efa5fc TM |
1490 | return res; |
1491 | /* Note: If we exit without ensuring that the commit is complete, | |
1492 | * we must mark the inode as dirty. Otherwise, future calls to | |
1493 | * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure | |
1494 | * that the data is on the disk. | |
1495 | */ | |
1496 | out_mark_dirty: | |
1497 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); | |
1da177e4 LT |
1498 | return res; |
1499 | } | |
8fc795f7 TM |
1500 | |
1501 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) | |
1502 | { | |
420e3646 TM |
1503 | struct nfs_inode *nfsi = NFS_I(inode); |
1504 | int flags = FLUSH_SYNC; | |
1505 | int ret = 0; | |
8fc795f7 | 1506 | |
3236c3e1 | 1507 | /* no commits means nothing needs to be done */ |
ea2cf228 | 1508 | if (!nfsi->commit_info.ncommit) |
3236c3e1 JL |
1509 | return ret; |
1510 | ||
a00dd6c0 JL |
1511 | if (wbc->sync_mode == WB_SYNC_NONE) { |
1512 | /* Don't commit yet if this is a non-blocking flush and there | |
1513 | * are a lot of outstanding writes for this mapping. | |
1514 | */ | |
ea2cf228 | 1515 | if (nfsi->commit_info.ncommit <= (nfsi->npages >> 1)) |
a00dd6c0 | 1516 | goto out_mark_dirty; |
420e3646 | 1517 | |
a00dd6c0 | 1518 | /* don't wait for the COMMIT response */ |
420e3646 | 1519 | flags = 0; |
a00dd6c0 JL |
1520 | } |
1521 | ||
420e3646 TM |
1522 | ret = nfs_commit_inode(inode, flags); |
1523 | if (ret >= 0) { | |
1524 | if (wbc->sync_mode == WB_SYNC_NONE) { | |
1525 | if (ret < wbc->nr_to_write) | |
1526 | wbc->nr_to_write -= ret; | |
1527 | else | |
1528 | wbc->nr_to_write = 0; | |
1529 | } | |
8fc795f7 | 1530 | return 0; |
420e3646 TM |
1531 | } |
1532 | out_mark_dirty: | |
8fc795f7 TM |
1533 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1534 | return ret; | |
1535 | } | |
c63c7b05 | 1536 | #else |
8fc795f7 TM |
1537 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) |
1538 | { | |
1539 | return 0; | |
1540 | } | |
1da177e4 LT |
1541 | #endif |
1542 | ||
8fc795f7 TM |
1543 | int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1544 | { | |
a8d8f02c BS |
1545 | return nfs_commit_unstable_pages(inode, wbc); |
1546 | } | |
89d77c8f | 1547 | EXPORT_SYMBOL_GPL(nfs_write_inode); |
a8d8f02c | 1548 | |
acdc53b2 TM |
1549 | /* |
1550 | * flush the inode to disk. | |
1551 | */ | |
1552 | int nfs_wb_all(struct inode *inode) | |
34901f70 TM |
1553 | { |
1554 | struct writeback_control wbc = { | |
72cb77f4 | 1555 | .sync_mode = WB_SYNC_ALL, |
34901f70 | 1556 | .nr_to_write = LONG_MAX, |
d7fb1207 TM |
1557 | .range_start = 0, |
1558 | .range_end = LLONG_MAX, | |
34901f70 | 1559 | }; |
f4ce1299 TM |
1560 | int ret; |
1561 | ||
1562 | trace_nfs_writeback_inode_enter(inode); | |
1563 | ||
1564 | ret = sync_inode(inode, &wbc); | |
34901f70 | 1565 | |
f4ce1299 TM |
1566 | trace_nfs_writeback_inode_exit(inode, ret); |
1567 | return ret; | |
1c75950b | 1568 | } |
ddda8e0a | 1569 | EXPORT_SYMBOL_GPL(nfs_wb_all); |
1c75950b | 1570 | |
1b3b4a1a TM |
1571 | int nfs_wb_page_cancel(struct inode *inode, struct page *page) |
1572 | { | |
1573 | struct nfs_page *req; | |
1b3b4a1a TM |
1574 | int ret = 0; |
1575 | ||
1b3b4a1a | 1576 | for (;;) { |
ba8b06e6 | 1577 | wait_on_page_writeback(page); |
1b3b4a1a TM |
1578 | req = nfs_page_find_request(page); |
1579 | if (req == NULL) | |
1b3b4a1a | 1580 | break; |
7ad84aa9 | 1581 | if (nfs_lock_request(req)) { |
8dd37758 | 1582 | nfs_clear_request_commit(req); |
1b3b4a1a TM |
1583 | nfs_inode_remove_request(req); |
1584 | /* | |
1585 | * In case nfs_inode_remove_request has marked the | |
1586 | * page as being dirty | |
1587 | */ | |
1588 | cancel_dirty_page(page, PAGE_CACHE_SIZE); | |
1d1afcbc | 1589 | nfs_unlock_and_release_request(req); |
1b3b4a1a TM |
1590 | break; |
1591 | } | |
1592 | ret = nfs_wait_on_request(req); | |
c9edda71 | 1593 | nfs_release_request(req); |
1b3b4a1a | 1594 | if (ret < 0) |
c988950e | 1595 | break; |
1b3b4a1a | 1596 | } |
1b3b4a1a TM |
1597 | return ret; |
1598 | } | |
1599 | ||
7f2f12d9 TM |
1600 | /* |
1601 | * Write back all requests on one page - we do this before reading it. | |
1602 | */ | |
1603 | int nfs_wb_page(struct inode *inode, struct page *page) | |
1c75950b | 1604 | { |
29418aa4 | 1605 | loff_t range_start = page_file_offset(page); |
1c75950b | 1606 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); |
4d770ccf | 1607 | struct writeback_control wbc = { |
4d770ccf | 1608 | .sync_mode = WB_SYNC_ALL, |
7f2f12d9 | 1609 | .nr_to_write = 0, |
4d770ccf TM |
1610 | .range_start = range_start, |
1611 | .range_end = range_end, | |
1612 | }; | |
1613 | int ret; | |
1c75950b | 1614 | |
f4ce1299 TM |
1615 | trace_nfs_writeback_page_enter(inode); |
1616 | ||
0522f6ad | 1617 | for (;;) { |
ba8b06e6 | 1618 | wait_on_page_writeback(page); |
73e3302f TM |
1619 | if (clear_page_dirty_for_io(page)) { |
1620 | ret = nfs_writepage_locked(page, &wbc); | |
1621 | if (ret < 0) | |
1622 | goto out_error; | |
0522f6ad | 1623 | continue; |
7f2f12d9 | 1624 | } |
f4ce1299 | 1625 | ret = 0; |
0522f6ad TM |
1626 | if (!PagePrivate(page)) |
1627 | break; | |
1628 | ret = nfs_commit_inode(inode, FLUSH_SYNC); | |
ba8b06e6 | 1629 | if (ret < 0) |
73e3302f | 1630 | goto out_error; |
7f2f12d9 | 1631 | } |
73e3302f | 1632 | out_error: |
f4ce1299 | 1633 | trace_nfs_writeback_page_exit(inode, ret); |
4d770ccf | 1634 | return ret; |
1c75950b TM |
1635 | } |
1636 | ||
074cc1de TM |
1637 | #ifdef CONFIG_MIGRATION |
1638 | int nfs_migrate_page(struct address_space *mapping, struct page *newpage, | |
a6bc32b8 | 1639 | struct page *page, enum migrate_mode mode) |
074cc1de | 1640 | { |
2da95652 JL |
1641 | /* |
1642 | * If PagePrivate is set, then the page is currently associated with | |
1643 | * an in-progress read or write request. Don't try to migrate it. | |
1644 | * | |
1645 | * FIXME: we could do this in principle, but we'll need a way to ensure | |
1646 | * that we can safely release the inode reference while holding | |
1647 | * the page lock. | |
1648 | */ | |
1649 | if (PagePrivate(page)) | |
1650 | return -EBUSY; | |
074cc1de | 1651 | |
8c209ce7 DH |
1652 | if (!nfs_fscache_release_page(page, GFP_KERNEL)) |
1653 | return -EBUSY; | |
074cc1de | 1654 | |
a6bc32b8 | 1655 | return migrate_page(mapping, newpage, page, mode); |
074cc1de TM |
1656 | } |
1657 | #endif | |
1658 | ||
f7b422b1 | 1659 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1660 | { |
1661 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
c0752cdf | 1662 | sizeof(struct nfs_rw_header), |
1da177e4 | 1663 | 0, SLAB_HWCACHE_ALIGN, |
20c2df83 | 1664 | NULL); |
1da177e4 LT |
1665 | if (nfs_wdata_cachep == NULL) |
1666 | return -ENOMEM; | |
1667 | ||
93d2341c MD |
1668 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1669 | nfs_wdata_cachep); | |
1da177e4 | 1670 | if (nfs_wdata_mempool == NULL) |
3dd4765f | 1671 | goto out_destroy_write_cache; |
1da177e4 | 1672 | |
0b7c0153 FI |
1673 | nfs_cdata_cachep = kmem_cache_create("nfs_commit_data", |
1674 | sizeof(struct nfs_commit_data), | |
1675 | 0, SLAB_HWCACHE_ALIGN, | |
1676 | NULL); | |
1677 | if (nfs_cdata_cachep == NULL) | |
3dd4765f | 1678 | goto out_destroy_write_mempool; |
0b7c0153 | 1679 | |
93d2341c | 1680 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
4c100210 | 1681 | nfs_cdata_cachep); |
1da177e4 | 1682 | if (nfs_commit_mempool == NULL) |
3dd4765f | 1683 | goto out_destroy_commit_cache; |
1da177e4 | 1684 | |
89a09141 PZ |
1685 | /* |
1686 | * NFS congestion size, scale with available memory. | |
1687 | * | |
1688 | * 64MB: 8192k | |
1689 | * 128MB: 11585k | |
1690 | * 256MB: 16384k | |
1691 | * 512MB: 23170k | |
1692 | * 1GB: 32768k | |
1693 | * 2GB: 46340k | |
1694 | * 4GB: 65536k | |
1695 | * 8GB: 92681k | |
1696 | * 16GB: 131072k | |
1697 | * | |
1698 | * This allows larger machines to have larger/more transfers. | |
1699 | * Limit the default to 256M | |
1700 | */ | |
1701 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); | |
1702 | if (nfs_congestion_kb > 256*1024) | |
1703 | nfs_congestion_kb = 256*1024; | |
1704 | ||
1da177e4 | 1705 | return 0; |
3dd4765f JL |
1706 | |
1707 | out_destroy_commit_cache: | |
1708 | kmem_cache_destroy(nfs_cdata_cachep); | |
1709 | out_destroy_write_mempool: | |
1710 | mempool_destroy(nfs_wdata_mempool); | |
1711 | out_destroy_write_cache: | |
1712 | kmem_cache_destroy(nfs_wdata_cachep); | |
1713 | return -ENOMEM; | |
1da177e4 LT |
1714 | } |
1715 | ||
266bee88 | 1716 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1717 | { |
1718 | mempool_destroy(nfs_commit_mempool); | |
3dd4765f | 1719 | kmem_cache_destroy(nfs_cdata_cachep); |
1da177e4 | 1720 | mempool_destroy(nfs_wdata_mempool); |
1a1d92c1 | 1721 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1722 | } |
1723 | ||
4a0de55c | 1724 | static const struct nfs_rw_ops nfs_rw_write_ops = { |
a4cdda59 | 1725 | .rw_mode = FMODE_WRITE, |
4a0de55c AS |
1726 | .rw_alloc_header = nfs_writehdr_alloc, |
1727 | .rw_free_header = nfs_writehdr_free, | |
a4cdda59 | 1728 | .rw_release = nfs_writeback_release_common, |
0eecb214 AS |
1729 | .rw_done = nfs_writeback_done, |
1730 | .rw_result = nfs_writeback_result, | |
1ed26f33 | 1731 | .rw_initiate = nfs_initiate_write, |
4a0de55c | 1732 | }; |