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