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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 LT |
33 | |
34 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE | |
35 | ||
36 | #define MIN_POOL_WRITE (32) | |
37 | #define MIN_POOL_COMMIT (4) | |
38 | ||
39 | /* | |
40 | * Local function declarations | |
41 | */ | |
c63c7b05 TM |
42 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *desc, |
43 | struct inode *inode, int ioflags); | |
f8512ad0 | 44 | static void nfs_redirty_request(struct nfs_page *req); |
788e7a89 TM |
45 | static const struct rpc_call_ops nfs_write_partial_ops; |
46 | static const struct rpc_call_ops nfs_write_full_ops; | |
47 | static const struct rpc_call_ops nfs_commit_ops; | |
1da177e4 | 48 | |
e18b890b | 49 | static struct kmem_cache *nfs_wdata_cachep; |
3feb2d49 | 50 | static mempool_t *nfs_wdata_mempool; |
1da177e4 LT |
51 | static mempool_t *nfs_commit_mempool; |
52 | ||
c9d8f89d | 53 | struct nfs_write_data *nfs_commitdata_alloc(void) |
1da177e4 | 54 | { |
e6b4f8da | 55 | struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS); |
40859d7e | 56 | |
1da177e4 LT |
57 | if (p) { |
58 | memset(p, 0, sizeof(*p)); | |
59 | INIT_LIST_HEAD(&p->pages); | |
60 | } | |
61 | return p; | |
62 | } | |
e0c2b380 | 63 | EXPORT_SYMBOL_GPL(nfs_commitdata_alloc); |
1da177e4 | 64 | |
5e4424af | 65 | void nfs_commit_free(struct nfs_write_data *p) |
1da177e4 | 66 | { |
40859d7e CL |
67 | if (p && (p->pagevec != &p->page_array[0])) |
68 | kfree(p->pagevec); | |
1da177e4 LT |
69 | mempool_free(p, nfs_commit_mempool); |
70 | } | |
e0c2b380 | 71 | EXPORT_SYMBOL_GPL(nfs_commit_free); |
1da177e4 | 72 | |
8d5658c9 | 73 | struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount) |
3feb2d49 | 74 | { |
e6b4f8da | 75 | struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS); |
3feb2d49 TM |
76 | |
77 | if (p) { | |
78 | memset(p, 0, sizeof(*p)); | |
79 | INIT_LIST_HEAD(&p->pages); | |
e9f7bee1 | 80 | p->npages = pagecount; |
0d0b5cb3 CL |
81 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
82 | p->pagevec = p->page_array; | |
3feb2d49 | 83 | else { |
0d0b5cb3 CL |
84 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
85 | if (!p->pagevec) { | |
3feb2d49 TM |
86 | mempool_free(p, nfs_wdata_mempool); |
87 | p = NULL; | |
88 | } | |
89 | } | |
90 | } | |
91 | return p; | |
92 | } | |
93 | ||
1ae88b2e | 94 | void nfs_writedata_free(struct nfs_write_data *p) |
3feb2d49 TM |
95 | { |
96 | if (p && (p->pagevec != &p->page_array[0])) | |
97 | kfree(p->pagevec); | |
98 | mempool_free(p, nfs_wdata_mempool); | |
99 | } | |
100 | ||
dce81290 | 101 | void nfs_writedata_release(struct nfs_write_data *wdata) |
1da177e4 | 102 | { |
5053aa56 | 103 | put_lseg(wdata->lseg); |
383ba719 | 104 | put_nfs_open_context(wdata->args.context); |
1da177e4 LT |
105 | nfs_writedata_free(wdata); |
106 | } | |
107 | ||
7b159fc1 TM |
108 | static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error) |
109 | { | |
110 | ctx->error = error; | |
111 | smp_wmb(); | |
112 | set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
113 | } | |
114 | ||
277459d2 TM |
115 | static struct nfs_page *nfs_page_find_request_locked(struct page *page) |
116 | { | |
117 | struct nfs_page *req = NULL; | |
118 | ||
119 | if (PagePrivate(page)) { | |
120 | req = (struct nfs_page *)page_private(page); | |
121 | if (req != NULL) | |
c03b4024 | 122 | kref_get(&req->wb_kref); |
277459d2 TM |
123 | } |
124 | return req; | |
125 | } | |
126 | ||
127 | static struct nfs_page *nfs_page_find_request(struct page *page) | |
128 | { | |
587142f8 | 129 | struct inode *inode = page->mapping->host; |
277459d2 | 130 | struct nfs_page *req = NULL; |
277459d2 | 131 | |
587142f8 | 132 | spin_lock(&inode->i_lock); |
277459d2 | 133 | req = nfs_page_find_request_locked(page); |
587142f8 | 134 | spin_unlock(&inode->i_lock); |
277459d2 TM |
135 | return req; |
136 | } | |
137 | ||
1da177e4 LT |
138 | /* Adjust the file length if we're writing beyond the end */ |
139 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) | |
140 | { | |
141 | struct inode *inode = page->mapping->host; | |
a3d01454 TM |
142 | loff_t end, i_size; |
143 | pgoff_t end_index; | |
1da177e4 | 144 | |
a3d01454 TM |
145 | spin_lock(&inode->i_lock); |
146 | i_size = i_size_read(inode); | |
147 | end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; | |
1da177e4 | 148 | if (i_size > 0 && page->index < end_index) |
a3d01454 | 149 | goto out; |
1da177e4 LT |
150 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); |
151 | if (i_size >= end) | |
a3d01454 | 152 | goto out; |
1da177e4 | 153 | i_size_write(inode, end); |
a3d01454 TM |
154 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
155 | out: | |
156 | spin_unlock(&inode->i_lock); | |
1da177e4 LT |
157 | } |
158 | ||
a301b777 TM |
159 | /* A writeback failed: mark the page as bad, and invalidate the page cache */ |
160 | static void nfs_set_pageerror(struct page *page) | |
161 | { | |
162 | SetPageError(page); | |
163 | nfs_zap_mapping(page->mapping->host, page->mapping); | |
164 | } | |
165 | ||
1da177e4 LT |
166 | /* We can set the PG_uptodate flag if we see that a write request |
167 | * covers the full page. | |
168 | */ | |
169 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) | |
170 | { | |
1da177e4 LT |
171 | if (PageUptodate(page)) |
172 | return; | |
173 | if (base != 0) | |
174 | return; | |
49a70f27 | 175 | if (count != nfs_page_length(page)) |
1da177e4 | 176 | return; |
49a70f27 | 177 | SetPageUptodate(page); |
1da177e4 LT |
178 | } |
179 | ||
1da177e4 LT |
180 | static int wb_priority(struct writeback_control *wbc) |
181 | { | |
182 | if (wbc->for_reclaim) | |
c63c7b05 | 183 | return FLUSH_HIGHPRI | FLUSH_STABLE; |
b17621fe | 184 | if (wbc->for_kupdate || wbc->for_background) |
b31268ac TM |
185 | return FLUSH_LOWPRI | FLUSH_COND_STABLE; |
186 | return FLUSH_COND_STABLE; | |
1da177e4 LT |
187 | } |
188 | ||
89a09141 PZ |
189 | /* |
190 | * NFS congestion control | |
191 | */ | |
192 | ||
193 | int nfs_congestion_kb; | |
194 | ||
195 | #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) | |
196 | #define NFS_CONGESTION_OFF_THRESH \ | |
197 | (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) | |
198 | ||
5a6d41b3 | 199 | static int nfs_set_page_writeback(struct page *page) |
89a09141 | 200 | { |
5a6d41b3 TM |
201 | int ret = test_set_page_writeback(page); |
202 | ||
203 | if (!ret) { | |
89a09141 PZ |
204 | struct inode *inode = page->mapping->host; |
205 | struct nfs_server *nfss = NFS_SERVER(inode); | |
206 | ||
a6305ddb | 207 | page_cache_get(page); |
277866a0 | 208 | if (atomic_long_inc_return(&nfss->writeback) > |
8aa7e847 JA |
209 | NFS_CONGESTION_ON_THRESH) { |
210 | set_bdi_congested(&nfss->backing_dev_info, | |
211 | BLK_RW_ASYNC); | |
212 | } | |
89a09141 | 213 | } |
5a6d41b3 | 214 | return ret; |
89a09141 PZ |
215 | } |
216 | ||
217 | static void nfs_end_page_writeback(struct page *page) | |
218 | { | |
219 | struct inode *inode = page->mapping->host; | |
220 | struct nfs_server *nfss = NFS_SERVER(inode); | |
221 | ||
222 | end_page_writeback(page); | |
a6305ddb | 223 | page_cache_release(page); |
c4dc4bee | 224 | if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) |
8aa7e847 | 225 | clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC); |
89a09141 PZ |
226 | } |
227 | ||
cfb506e1 | 228 | static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock) |
e261f51f | 229 | { |
587142f8 | 230 | struct inode *inode = page->mapping->host; |
e261f51f | 231 | struct nfs_page *req; |
e261f51f TM |
232 | int ret; |
233 | ||
587142f8 | 234 | spin_lock(&inode->i_lock); |
074cc1de | 235 | for (;;) { |
e261f51f | 236 | req = nfs_page_find_request_locked(page); |
074cc1de TM |
237 | if (req == NULL) |
238 | break; | |
acee478a | 239 | if (nfs_set_page_tag_locked(req)) |
e261f51f TM |
240 | break; |
241 | /* Note: If we hold the page lock, as is the case in nfs_writepage, | |
acee478a | 242 | * then the call to nfs_set_page_tag_locked() will always |
e261f51f TM |
243 | * succeed provided that someone hasn't already marked the |
244 | * request as dirty (in which case we don't care). | |
245 | */ | |
587142f8 | 246 | spin_unlock(&inode->i_lock); |
cfb506e1 TM |
247 | if (!nonblock) |
248 | ret = nfs_wait_on_request(req); | |
249 | else | |
250 | ret = -EAGAIN; | |
e261f51f TM |
251 | nfs_release_request(req); |
252 | if (ret != 0) | |
074cc1de | 253 | return ERR_PTR(ret); |
587142f8 | 254 | spin_lock(&inode->i_lock); |
e261f51f | 255 | } |
587142f8 | 256 | spin_unlock(&inode->i_lock); |
074cc1de TM |
257 | return req; |
258 | } | |
259 | ||
260 | /* | |
261 | * Find an associated nfs write request, and prepare to flush it out | |
262 | * May return an error if the user signalled nfs_wait_on_request(). | |
263 | */ | |
264 | static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, | |
cfb506e1 | 265 | struct page *page, bool nonblock) |
074cc1de TM |
266 | { |
267 | struct nfs_page *req; | |
268 | int ret = 0; | |
269 | ||
cfb506e1 | 270 | req = nfs_find_and_lock_request(page, nonblock); |
074cc1de TM |
271 | if (!req) |
272 | goto out; | |
273 | ret = PTR_ERR(req); | |
274 | if (IS_ERR(req)) | |
275 | goto out; | |
276 | ||
277 | ret = nfs_set_page_writeback(page); | |
278 | BUG_ON(ret != 0); | |
279 | BUG_ON(test_bit(PG_CLEAN, &req->wb_flags)); | |
280 | ||
f8512ad0 FI |
281 | if (!nfs_pageio_add_request(pgio, req)) { |
282 | nfs_redirty_request(req); | |
074cc1de | 283 | ret = pgio->pg_error; |
f8512ad0 | 284 | } |
074cc1de TM |
285 | out: |
286 | return ret; | |
e261f51f TM |
287 | } |
288 | ||
f758c885 | 289 | static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) |
1da177e4 | 290 | { |
1da177e4 | 291 | struct inode *inode = page->mapping->host; |
cfb506e1 | 292 | int ret; |
1da177e4 | 293 | |
91d5b470 CL |
294 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
295 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
296 | ||
7fe7f848 | 297 | nfs_pageio_cond_complete(pgio, page->index); |
1b430bee | 298 | ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE); |
cfb506e1 TM |
299 | if (ret == -EAGAIN) { |
300 | redirty_page_for_writepage(wbc, page); | |
301 | ret = 0; | |
302 | } | |
303 | return ret; | |
f758c885 | 304 | } |
7fe7f848 | 305 | |
f758c885 TM |
306 | /* |
307 | * Write an mmapped page to the server. | |
308 | */ | |
309 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
310 | { | |
311 | struct nfs_pageio_descriptor pgio; | |
312 | int err; | |
49a70f27 | 313 | |
f758c885 TM |
314 | nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc)); |
315 | err = nfs_do_writepage(page, wbc, &pgio); | |
316 | nfs_pageio_complete(&pgio); | |
317 | if (err < 0) | |
318 | return err; | |
319 | if (pgio.pg_error < 0) | |
320 | return pgio.pg_error; | |
321 | return 0; | |
4d770ccf TM |
322 | } |
323 | ||
324 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
325 | { | |
f758c885 | 326 | int ret; |
4d770ccf | 327 | |
f758c885 | 328 | ret = nfs_writepage_locked(page, wbc); |
1da177e4 | 329 | unlock_page(page); |
f758c885 TM |
330 | return ret; |
331 | } | |
332 | ||
333 | static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) | |
334 | { | |
335 | int ret; | |
336 | ||
337 | ret = nfs_do_writepage(page, wbc, data); | |
338 | unlock_page(page); | |
339 | return ret; | |
1da177e4 LT |
340 | } |
341 | ||
1da177e4 LT |
342 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) |
343 | { | |
1da177e4 | 344 | struct inode *inode = mapping->host; |
72cb77f4 | 345 | unsigned long *bitlock = &NFS_I(inode)->flags; |
c63c7b05 | 346 | struct nfs_pageio_descriptor pgio; |
1da177e4 LT |
347 | int err; |
348 | ||
72cb77f4 TM |
349 | /* Stop dirtying of new pages while we sync */ |
350 | err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING, | |
351 | nfs_wait_bit_killable, TASK_KILLABLE); | |
352 | if (err) | |
353 | goto out_err; | |
354 | ||
91d5b470 CL |
355 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
356 | ||
c63c7b05 | 357 | nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); |
f758c885 | 358 | err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); |
c63c7b05 | 359 | nfs_pageio_complete(&pgio); |
72cb77f4 TM |
360 | |
361 | clear_bit_unlock(NFS_INO_FLUSHING, bitlock); | |
362 | smp_mb__after_clear_bit(); | |
363 | wake_up_bit(bitlock, NFS_INO_FLUSHING); | |
364 | ||
f758c885 | 365 | if (err < 0) |
72cb77f4 TM |
366 | goto out_err; |
367 | err = pgio.pg_error; | |
368 | if (err < 0) | |
369 | goto out_err; | |
c63c7b05 | 370 | return 0; |
72cb77f4 TM |
371 | out_err: |
372 | return err; | |
1da177e4 LT |
373 | } |
374 | ||
375 | /* | |
376 | * Insert a write request into an inode | |
377 | */ | |
e7d39069 | 378 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) |
1da177e4 LT |
379 | { |
380 | struct nfs_inode *nfsi = NFS_I(inode); | |
381 | int error; | |
382 | ||
e7d39069 TM |
383 | error = radix_tree_preload(GFP_NOFS); |
384 | if (error != 0) | |
385 | goto out; | |
386 | ||
387 | /* Lock the request! */ | |
388 | nfs_lock_request_dontget(req); | |
389 | ||
390 | spin_lock(&inode->i_lock); | |
1da177e4 | 391 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); |
27852596 | 392 | BUG_ON(error); |
4d65c520 | 393 | if (!nfsi->npages && nfs_have_delegation(inode, FMODE_WRITE)) |
a9a4a87a | 394 | inode->i_version++; |
2df485a7 | 395 | set_bit(PG_MAPPED, &req->wb_flags); |
deb7d638 | 396 | SetPagePrivate(req->wb_page); |
277459d2 | 397 | set_page_private(req->wb_page, (unsigned long)req); |
1da177e4 | 398 | nfsi->npages++; |
c03b4024 | 399 | kref_get(&req->wb_kref); |
27852596 NP |
400 | radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, |
401 | NFS_PAGE_TAG_LOCKED); | |
e7d39069 TM |
402 | spin_unlock(&inode->i_lock); |
403 | radix_tree_preload_end(); | |
404 | out: | |
405 | return error; | |
1da177e4 LT |
406 | } |
407 | ||
408 | /* | |
89a09141 | 409 | * Remove a write request from an inode |
1da177e4 LT |
410 | */ |
411 | static void nfs_inode_remove_request(struct nfs_page *req) | |
412 | { | |
3d4ff43d | 413 | struct inode *inode = req->wb_context->dentry->d_inode; |
1da177e4 LT |
414 | struct nfs_inode *nfsi = NFS_I(inode); |
415 | ||
416 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
417 | ||
587142f8 | 418 | spin_lock(&inode->i_lock); |
277459d2 | 419 | set_page_private(req->wb_page, 0); |
deb7d638 | 420 | ClearPagePrivate(req->wb_page); |
2df485a7 | 421 | clear_bit(PG_MAPPED, &req->wb_flags); |
1da177e4 LT |
422 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
423 | nfsi->npages--; | |
4d65c520 | 424 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
425 | nfs_release_request(req); |
426 | } | |
427 | ||
61822ab5 | 428 | static void |
6d884e8f | 429 | nfs_mark_request_dirty(struct nfs_page *req) |
61822ab5 | 430 | { |
61822ab5 TM |
431 | __set_page_dirty_nobuffers(req->wb_page); |
432 | } | |
433 | ||
1da177e4 LT |
434 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
435 | /* | |
436 | * Add a request to the inode's commit list. | |
437 | */ | |
438 | static void | |
a861a1e1 | 439 | nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg) |
1da177e4 | 440 | { |
3d4ff43d | 441 | struct inode *inode = req->wb_context->dentry->d_inode; |
1da177e4 LT |
442 | struct nfs_inode *nfsi = NFS_I(inode); |
443 | ||
587142f8 | 444 | spin_lock(&inode->i_lock); |
e468bae9 | 445 | set_bit(PG_CLEAN, &(req)->wb_flags); |
5c369683 TM |
446 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
447 | req->wb_index, | |
448 | NFS_PAGE_TAG_COMMIT); | |
ff778d02 | 449 | nfsi->ncommit++; |
587142f8 | 450 | spin_unlock(&inode->i_lock); |
a861a1e1 | 451 | pnfs_mark_request_commit(req, lseg); |
fd39fc85 | 452 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 | 453 | inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE); |
a1803044 | 454 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1da177e4 | 455 | } |
8e821cad | 456 | |
e468bae9 TM |
457 | static int |
458 | nfs_clear_request_commit(struct nfs_page *req) | |
459 | { | |
460 | struct page *page = req->wb_page; | |
461 | ||
462 | if (test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) { | |
463 | dec_zone_page_state(page, NR_UNSTABLE_NFS); | |
464 | dec_bdi_stat(page->mapping->backing_dev_info, BDI_RECLAIMABLE); | |
465 | return 1; | |
466 | } | |
467 | return 0; | |
468 | } | |
469 | ||
8e821cad TM |
470 | static inline |
471 | int nfs_write_need_commit(struct nfs_write_data *data) | |
472 | { | |
465d5243 FI |
473 | if (data->verf.committed == NFS_DATA_SYNC) |
474 | return data->lseg == NULL; | |
475 | else | |
476 | return data->verf.committed != NFS_FILE_SYNC; | |
8e821cad TM |
477 | } |
478 | ||
479 | static inline | |
a861a1e1 FI |
480 | int nfs_reschedule_unstable_write(struct nfs_page *req, |
481 | struct nfs_write_data *data) | |
8e821cad | 482 | { |
e468bae9 | 483 | if (test_and_clear_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
a861a1e1 | 484 | nfs_mark_request_commit(req, data->lseg); |
8e821cad TM |
485 | return 1; |
486 | } | |
487 | if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { | |
6d884e8f | 488 | nfs_mark_request_dirty(req); |
8e821cad TM |
489 | return 1; |
490 | } | |
491 | return 0; | |
492 | } | |
493 | #else | |
494 | static inline void | |
a861a1e1 | 495 | nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg) |
8e821cad TM |
496 | { |
497 | } | |
498 | ||
e468bae9 TM |
499 | static inline int |
500 | nfs_clear_request_commit(struct nfs_page *req) | |
501 | { | |
502 | return 0; | |
503 | } | |
504 | ||
8e821cad TM |
505 | static inline |
506 | int nfs_write_need_commit(struct nfs_write_data *data) | |
507 | { | |
508 | return 0; | |
509 | } | |
510 | ||
511 | static inline | |
a861a1e1 FI |
512 | int nfs_reschedule_unstable_write(struct nfs_page *req, |
513 | struct nfs_write_data *data) | |
8e821cad TM |
514 | { |
515 | return 0; | |
516 | } | |
1da177e4 LT |
517 | #endif |
518 | ||
47c62564 | 519 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
fb8a1f11 TM |
520 | static int |
521 | nfs_need_commit(struct nfs_inode *nfsi) | |
522 | { | |
523 | return radix_tree_tagged(&nfsi->nfs_page_tree, NFS_PAGE_TAG_COMMIT); | |
524 | } | |
525 | ||
1da177e4 LT |
526 | /* |
527 | * nfs_scan_commit - Scan an inode for commit requests | |
528 | * @inode: NFS inode to scan | |
529 | * @dst: destination list | |
530 | * @idx_start: lower bound of page->index to scan. | |
531 | * @npages: idx_start + npages sets the upper bound to scan. | |
532 | * | |
533 | * Moves requests from the inode's 'commit' request list. | |
534 | * The requests are *not* checked to ensure that they form a contiguous set. | |
535 | */ | |
536 | static int | |
ca52fec1 | 537 | nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
538 | { |
539 | struct nfs_inode *nfsi = NFS_I(inode); | |
ff778d02 | 540 | int ret; |
3da28eb1 | 541 | |
fb8a1f11 TM |
542 | if (!nfs_need_commit(nfsi)) |
543 | return 0; | |
544 | ||
0d88f6e8 | 545 | spin_lock(&inode->i_lock); |
ff778d02 TM |
546 | ret = nfs_scan_list(nfsi, dst, idx_start, npages, NFS_PAGE_TAG_COMMIT); |
547 | if (ret > 0) | |
548 | nfsi->ncommit -= ret; | |
0d88f6e8 DC |
549 | spin_unlock(&inode->i_lock); |
550 | ||
2928db1f TM |
551 | if (nfs_need_commit(NFS_I(inode))) |
552 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); | |
0d88f6e8 | 553 | |
ff778d02 | 554 | return ret; |
1da177e4 | 555 | } |
c42de9dd | 556 | #else |
fb8a1f11 TM |
557 | static inline int nfs_need_commit(struct nfs_inode *nfsi) |
558 | { | |
559 | return 0; | |
560 | } | |
561 | ||
ca52fec1 | 562 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
c42de9dd TM |
563 | { |
564 | return 0; | |
565 | } | |
1da177e4 LT |
566 | #endif |
567 | ||
1da177e4 | 568 | /* |
e7d39069 TM |
569 | * Search for an existing write request, and attempt to update |
570 | * it to reflect a new dirty region on a given page. | |
1da177e4 | 571 | * |
e7d39069 TM |
572 | * If the attempt fails, then the existing request is flushed out |
573 | * to disk. | |
1da177e4 | 574 | */ |
e7d39069 TM |
575 | static struct nfs_page *nfs_try_to_update_request(struct inode *inode, |
576 | struct page *page, | |
577 | unsigned int offset, | |
578 | unsigned int bytes) | |
1da177e4 | 579 | { |
e7d39069 TM |
580 | struct nfs_page *req; |
581 | unsigned int rqend; | |
582 | unsigned int end; | |
583 | int error; | |
584 | ||
585 | if (!PagePrivate(page)) | |
586 | return NULL; | |
1da177e4 LT |
587 | |
588 | end = offset + bytes; | |
e7d39069 | 589 | spin_lock(&inode->i_lock); |
1da177e4 | 590 | |
1da177e4 | 591 | for (;;) { |
277459d2 | 592 | req = nfs_page_find_request_locked(page); |
e7d39069 TM |
593 | if (req == NULL) |
594 | goto out_unlock; | |
595 | ||
596 | rqend = req->wb_offset + req->wb_bytes; | |
597 | /* | |
598 | * Tell the caller to flush out the request if | |
599 | * the offsets are non-contiguous. | |
600 | * Note: nfs_flush_incompatible() will already | |
601 | * have flushed out requests having wrong owners. | |
602 | */ | |
e468bae9 | 603 | if (offset > rqend |
e7d39069 TM |
604 | || end < req->wb_offset) |
605 | goto out_flushme; | |
606 | ||
607 | if (nfs_set_page_tag_locked(req)) | |
1da177e4 | 608 | break; |
1da177e4 | 609 | |
e7d39069 | 610 | /* The request is locked, so wait and then retry */ |
587142f8 | 611 | spin_unlock(&inode->i_lock); |
e7d39069 TM |
612 | error = nfs_wait_on_request(req); |
613 | nfs_release_request(req); | |
614 | if (error != 0) | |
615 | goto out_err; | |
616 | spin_lock(&inode->i_lock); | |
1da177e4 LT |
617 | } |
618 | ||
ff778d02 | 619 | if (nfs_clear_request_commit(req) && |
a861a1e1 FI |
620 | radix_tree_tag_clear(&NFS_I(inode)->nfs_page_tree, |
621 | req->wb_index, NFS_PAGE_TAG_COMMIT) != NULL) { | |
ff778d02 | 622 | NFS_I(inode)->ncommit--; |
a861a1e1 FI |
623 | pnfs_clear_request_commit(req); |
624 | } | |
e468bae9 | 625 | |
1da177e4 LT |
626 | /* Okay, the request matches. Update the region */ |
627 | if (offset < req->wb_offset) { | |
628 | req->wb_offset = offset; | |
629 | req->wb_pgbase = offset; | |
1da177e4 | 630 | } |
1da177e4 LT |
631 | if (end > rqend) |
632 | req->wb_bytes = end - req->wb_offset; | |
e7d39069 TM |
633 | else |
634 | req->wb_bytes = rqend - req->wb_offset; | |
635 | out_unlock: | |
636 | spin_unlock(&inode->i_lock); | |
637 | return req; | |
638 | out_flushme: | |
639 | spin_unlock(&inode->i_lock); | |
640 | nfs_release_request(req); | |
641 | error = nfs_wb_page(inode, page); | |
642 | out_err: | |
643 | return ERR_PTR(error); | |
644 | } | |
645 | ||
646 | /* | |
647 | * Try to update an existing write request, or create one if there is none. | |
648 | * | |
649 | * Note: Should always be called with the Page Lock held to prevent races | |
650 | * if we have to add a new request. Also assumes that the caller has | |
651 | * already called nfs_flush_incompatible() if necessary. | |
652 | */ | |
653 | static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx, | |
654 | struct page *page, unsigned int offset, unsigned int bytes) | |
655 | { | |
656 | struct inode *inode = page->mapping->host; | |
657 | struct nfs_page *req; | |
658 | int error; | |
1da177e4 | 659 | |
e7d39069 TM |
660 | req = nfs_try_to_update_request(inode, page, offset, bytes); |
661 | if (req != NULL) | |
662 | goto out; | |
663 | req = nfs_create_request(ctx, inode, page, offset, bytes); | |
664 | if (IS_ERR(req)) | |
665 | goto out; | |
666 | error = nfs_inode_add_request(inode, req); | |
667 | if (error != 0) { | |
668 | nfs_release_request(req); | |
669 | req = ERR_PTR(error); | |
670 | } | |
efc91ed0 | 671 | out: |
61e930a9 | 672 | return req; |
1da177e4 LT |
673 | } |
674 | ||
e7d39069 TM |
675 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
676 | unsigned int offset, unsigned int count) | |
677 | { | |
678 | struct nfs_page *req; | |
679 | ||
680 | req = nfs_setup_write_request(ctx, page, offset, count); | |
681 | if (IS_ERR(req)) | |
682 | return PTR_ERR(req); | |
683 | /* Update file length */ | |
684 | nfs_grow_file(page, offset, count); | |
685 | nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); | |
a6305ddb | 686 | nfs_mark_request_dirty(req); |
e7d39069 TM |
687 | nfs_clear_page_tag_locked(req); |
688 | return 0; | |
689 | } | |
690 | ||
1da177e4 LT |
691 | int nfs_flush_incompatible(struct file *file, struct page *page) |
692 | { | |
cd3758e3 | 693 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 694 | struct nfs_page *req; |
1a54533e | 695 | int do_flush, status; |
1da177e4 LT |
696 | /* |
697 | * Look for a request corresponding to this page. If there | |
698 | * is one, and it belongs to another file, we flush it out | |
699 | * before we try to copy anything into the page. Do this | |
700 | * due to the lack of an ACCESS-type call in NFSv2. | |
701 | * Also do the same if we find a request from an existing | |
702 | * dropped page. | |
703 | */ | |
1a54533e TM |
704 | do { |
705 | req = nfs_page_find_request(page); | |
706 | if (req == NULL) | |
707 | return 0; | |
f11ac8db TM |
708 | do_flush = req->wb_page != page || req->wb_context != ctx || |
709 | req->wb_lock_context->lockowner != current->files || | |
710 | req->wb_lock_context->pid != current->tgid; | |
1da177e4 | 711 | nfs_release_request(req); |
1a54533e TM |
712 | if (!do_flush) |
713 | return 0; | |
714 | status = nfs_wb_page(page->mapping->host, page); | |
715 | } while (status == 0); | |
716 | return status; | |
1da177e4 LT |
717 | } |
718 | ||
5d47a356 TM |
719 | /* |
720 | * If the page cache is marked as unsafe or invalid, then we can't rely on | |
721 | * the PageUptodate() flag. In this case, we will need to turn off | |
722 | * write optimisations that depend on the page contents being correct. | |
723 | */ | |
724 | static int nfs_write_pageuptodate(struct page *page, struct inode *inode) | |
725 | { | |
726 | return PageUptodate(page) && | |
727 | !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA)); | |
728 | } | |
729 | ||
1da177e4 LT |
730 | /* |
731 | * Update and possibly write a cached page of an NFS file. | |
732 | * | |
733 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
734 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
735 | */ | |
736 | int nfs_updatepage(struct file *file, struct page *page, | |
737 | unsigned int offset, unsigned int count) | |
738 | { | |
cd3758e3 | 739 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 740 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
741 | int status = 0; |
742 | ||
91d5b470 CL |
743 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
744 | ||
48186c7d | 745 | dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n", |
01cce933 JJS |
746 | file->f_path.dentry->d_parent->d_name.name, |
747 | file->f_path.dentry->d_name.name, count, | |
48186c7d | 748 | (long long)(page_offset(page) + offset)); |
1da177e4 | 749 | |
1da177e4 | 750 | /* If we're not using byte range locks, and we know the page |
5d47a356 TM |
751 | * is up to date, it may be more efficient to extend the write |
752 | * to cover the entire page in order to avoid fragmentation | |
753 | * inefficiencies. | |
1da177e4 | 754 | */ |
5d47a356 TM |
755 | if (nfs_write_pageuptodate(page, inode) && |
756 | inode->i_flock == NULL && | |
6b2f3d1f | 757 | !(file->f_flags & O_DSYNC)) { |
49a70f27 | 758 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 759 | offset = 0; |
1da177e4 LT |
760 | } |
761 | ||
e21195a7 | 762 | status = nfs_writepage_setup(ctx, page, offset, count); |
03fa9e84 TM |
763 | if (status < 0) |
764 | nfs_set_pageerror(page); | |
59b7c05f TM |
765 | else |
766 | __set_page_dirty_nobuffers(page); | |
1da177e4 | 767 | |
48186c7d | 768 | dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n", |
1da177e4 | 769 | status, (long long)i_size_read(inode)); |
1da177e4 LT |
770 | return status; |
771 | } | |
772 | ||
a861a1e1 FI |
773 | static void nfs_writepage_release(struct nfs_page *req, |
774 | struct nfs_write_data *data) | |
1da177e4 | 775 | { |
a6305ddb | 776 | struct page *page = req->wb_page; |
1da177e4 | 777 | |
a861a1e1 | 778 | if (PageError(req->wb_page) || !nfs_reschedule_unstable_write(req, data)) |
8e821cad | 779 | nfs_inode_remove_request(req); |
9fd367f0 | 780 | nfs_clear_page_tag_locked(req); |
a6305ddb | 781 | nfs_end_page_writeback(page); |
1da177e4 LT |
782 | } |
783 | ||
3ff7576d | 784 | static int flush_task_priority(int how) |
1da177e4 LT |
785 | { |
786 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
787 | case FLUSH_HIGHPRI: | |
788 | return RPC_PRIORITY_HIGH; | |
789 | case FLUSH_LOWPRI: | |
790 | return RPC_PRIORITY_LOW; | |
791 | } | |
792 | return RPC_PRIORITY_NORMAL; | |
793 | } | |
794 | ||
a69aef14 | 795 | int nfs_initiate_write(struct nfs_write_data *data, |
d138d5d1 AA |
796 | struct rpc_clnt *clnt, |
797 | const struct rpc_call_ops *call_ops, | |
798 | int how) | |
1da177e4 | 799 | { |
d138d5d1 | 800 | struct inode *inode = data->inode; |
3ff7576d | 801 | int priority = flush_task_priority(how); |
07737691 | 802 | struct rpc_task *task; |
bdc7f021 TM |
803 | struct rpc_message msg = { |
804 | .rpc_argp = &data->args, | |
805 | .rpc_resp = &data->res, | |
d138d5d1 | 806 | .rpc_cred = data->cred, |
bdc7f021 | 807 | }; |
84115e1c | 808 | struct rpc_task_setup task_setup_data = { |
d138d5d1 | 809 | .rpc_client = clnt, |
07737691 | 810 | .task = &data->task, |
bdc7f021 | 811 | .rpc_message = &msg, |
84115e1c TM |
812 | .callback_ops = call_ops, |
813 | .callback_data = data, | |
101070ca | 814 | .workqueue = nfsiod_workqueue, |
2c61be0a | 815 | .flags = RPC_TASK_ASYNC, |
3ff7576d | 816 | .priority = priority, |
84115e1c | 817 | }; |
2c61be0a | 818 | int ret = 0; |
1da177e4 | 819 | |
d138d5d1 AA |
820 | /* Set up the initial task struct. */ |
821 | NFS_PROTO(inode)->write_setup(data, &msg); | |
822 | ||
823 | dprintk("NFS: %5u initiated write call " | |
824 | "(req %s/%lld, %u bytes @ offset %llu)\n", | |
825 | data->task.tk_pid, | |
826 | inode->i_sb->s_id, | |
827 | (long long)NFS_FILEID(inode), | |
828 | data->args.count, | |
829 | (unsigned long long)data->args.offset); | |
830 | ||
831 | task = rpc_run_task(&task_setup_data); | |
832 | if (IS_ERR(task)) { | |
833 | ret = PTR_ERR(task); | |
834 | goto out; | |
835 | } | |
836 | if (how & FLUSH_SYNC) { | |
837 | ret = rpc_wait_for_completion_task(task); | |
838 | if (ret == 0) | |
839 | ret = task->tk_status; | |
840 | } | |
841 | rpc_put_task(task); | |
842 | out: | |
843 | return ret; | |
844 | } | |
a69aef14 | 845 | EXPORT_SYMBOL_GPL(nfs_initiate_write); |
d138d5d1 AA |
846 | |
847 | /* | |
848 | * Set up the argument/result storage required for the RPC call. | |
849 | */ | |
6e4efd56 | 850 | static void nfs_write_rpcsetup(struct nfs_page *req, |
d138d5d1 | 851 | struct nfs_write_data *data, |
d138d5d1 AA |
852 | unsigned int count, unsigned int offset, |
853 | int how) | |
854 | { | |
3d4ff43d | 855 | struct inode *inode = req->wb_context->dentry->d_inode; |
d138d5d1 | 856 | |
1da177e4 LT |
857 | /* Set up the RPC argument and reply structs |
858 | * NB: take care not to mess about with data->commit et al. */ | |
859 | ||
860 | data->req = req; | |
3d4ff43d | 861 | data->inode = inode = req->wb_context->dentry->d_inode; |
d138d5d1 | 862 | data->cred = req->wb_context->cred; |
1da177e4 LT |
863 | |
864 | data->args.fh = NFS_FH(inode); | |
865 | data->args.offset = req_offset(req) + offset; | |
2bea038c BH |
866 | /* pnfs_set_layoutcommit needs this */ |
867 | data->mds_offset = data->args.offset; | |
1da177e4 LT |
868 | data->args.pgbase = req->wb_pgbase + offset; |
869 | data->args.pages = data->pagevec; | |
870 | data->args.count = count; | |
383ba719 | 871 | data->args.context = get_nfs_open_context(req->wb_context); |
f11ac8db | 872 | data->args.lock_context = req->wb_lock_context; |
bdc7f021 | 873 | data->args.stable = NFS_UNSTABLE; |
87ed5eb4 TM |
874 | switch (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) { |
875 | case 0: | |
876 | break; | |
877 | case FLUSH_COND_STABLE: | |
878 | if (nfs_need_commit(NFS_I(inode))) | |
879 | break; | |
880 | default: | |
881 | data->args.stable = NFS_FILE_SYNC; | |
bdc7f021 | 882 | } |
1da177e4 LT |
883 | |
884 | data->res.fattr = &data->fattr; | |
885 | data->res.count = count; | |
886 | data->res.verf = &data->verf; | |
0e574af1 | 887 | nfs_fattr_init(&data->fattr); |
6e4efd56 | 888 | } |
1da177e4 | 889 | |
6e4efd56 TM |
890 | static int nfs_do_write(struct nfs_write_data *data, |
891 | const struct rpc_call_ops *call_ops, | |
6e4efd56 TM |
892 | int how) |
893 | { | |
5f00bcb3 | 894 | struct inode *inode = data->args.context->dentry->d_inode; |
0382b744 | 895 | |
d138d5d1 | 896 | return nfs_initiate_write(data, NFS_CLIENT(inode), call_ops, how); |
1da177e4 LT |
897 | } |
898 | ||
275acaaf TM |
899 | static int nfs_do_multiple_writes(struct list_head *head, |
900 | const struct rpc_call_ops *call_ops, | |
275acaaf TM |
901 | int how) |
902 | { | |
903 | struct nfs_write_data *data; | |
904 | int ret = 0; | |
905 | ||
906 | while (!list_empty(head)) { | |
907 | int ret2; | |
908 | ||
909 | data = list_entry(head->next, struct nfs_write_data, list); | |
910 | list_del_init(&data->list); | |
911 | ||
dce81290 | 912 | ret2 = nfs_do_write(data, call_ops, how); |
275acaaf TM |
913 | if (ret == 0) |
914 | ret = ret2; | |
915 | } | |
916 | return ret; | |
917 | } | |
918 | ||
6d884e8f F |
919 | /* If a nfs_flush_* function fails, it should remove reqs from @head and |
920 | * call this on each, which will prepare them to be retried on next | |
921 | * writeback using standard nfs. | |
922 | */ | |
923 | static void nfs_redirty_request(struct nfs_page *req) | |
924 | { | |
a6305ddb TM |
925 | struct page *page = req->wb_page; |
926 | ||
6d884e8f | 927 | nfs_mark_request_dirty(req); |
6d884e8f | 928 | nfs_clear_page_tag_locked(req); |
a6305ddb | 929 | nfs_end_page_writeback(page); |
6d884e8f F |
930 | } |
931 | ||
1da177e4 LT |
932 | /* |
933 | * Generate multiple small requests to write out a single | |
934 | * contiguous dirty area on one page. | |
935 | */ | |
275acaaf | 936 | static int nfs_flush_multi(struct nfs_pageio_descriptor *desc, struct list_head *res) |
1da177e4 | 937 | { |
c76069bd | 938 | struct nfs_page *req = nfs_list_entry(desc->pg_list.next); |
1da177e4 LT |
939 | struct page *page = req->wb_page; |
940 | struct nfs_write_data *data; | |
d097971d | 941 | size_t wsize = desc->pg_bsize, nbytes; |
e9f7bee1 | 942 | unsigned int offset; |
1da177e4 | 943 | int requests = 0; |
dbae4c73 | 944 | int ret = 0; |
1da177e4 LT |
945 | |
946 | nfs_list_remove_request(req); | |
947 | ||
b31268ac TM |
948 | if ((desc->pg_ioflags & FLUSH_COND_STABLE) && |
949 | (desc->pg_moreio || NFS_I(desc->pg_inode)->ncommit || | |
950 | desc->pg_count > wsize)) | |
951 | desc->pg_ioflags &= ~FLUSH_COND_STABLE; | |
952 | ||
953 | ||
275acaaf | 954 | offset = 0; |
c76069bd | 955 | nbytes = desc->pg_count; |
e9f7bee1 TM |
956 | do { |
957 | size_t len = min(nbytes, wsize); | |
958 | ||
8d5658c9 | 959 | data = nfs_writedata_alloc(1); |
1da177e4 LT |
960 | if (!data) |
961 | goto out_bad; | |
275acaaf | 962 | data->pagevec[0] = page; |
f13c3620 | 963 | nfs_write_rpcsetup(req, data, len, offset, desc->pg_ioflags); |
275acaaf | 964 | list_add(&data->list, res); |
1da177e4 | 965 | requests++; |
e9f7bee1 | 966 | nbytes -= len; |
275acaaf | 967 | offset += len; |
e9f7bee1 | 968 | } while (nbytes != 0); |
1da177e4 | 969 | atomic_set(&req->wb_complete, requests); |
50828d7e | 970 | desc->pg_rpc_callops = &nfs_write_partial_ops; |
dbae4c73 | 971 | return ret; |
1da177e4 LT |
972 | |
973 | out_bad: | |
275acaaf TM |
974 | while (!list_empty(res)) { |
975 | data = list_entry(res->next, struct nfs_write_data, list); | |
6e4efd56 | 976 | list_del(&data->list); |
0da2a4ac | 977 | nfs_writedata_free(data); |
1da177e4 | 978 | } |
61822ab5 | 979 | nfs_redirty_request(req); |
1da177e4 LT |
980 | return -ENOMEM; |
981 | } | |
982 | ||
983 | /* | |
984 | * Create an RPC task for the given write request and kick it. | |
985 | * The page must have been locked by the caller. | |
986 | * | |
987 | * It may happen that the page we're passed is not marked dirty. | |
988 | * This is the case if nfs_updatepage detects a conflicting request | |
989 | * that has been written but not committed. | |
990 | */ | |
275acaaf | 991 | static int nfs_flush_one(struct nfs_pageio_descriptor *desc, struct list_head *res) |
1da177e4 LT |
992 | { |
993 | struct nfs_page *req; | |
994 | struct page **pages; | |
995 | struct nfs_write_data *data; | |
c76069bd | 996 | struct list_head *head = &desc->pg_list; |
3b609184 | 997 | int ret = 0; |
1da177e4 | 998 | |
c76069bd FI |
999 | data = nfs_writedata_alloc(nfs_page_array_len(desc->pg_base, |
1000 | desc->pg_count)); | |
44b83799 FI |
1001 | if (!data) { |
1002 | while (!list_empty(head)) { | |
1003 | req = nfs_list_entry(head->next); | |
1004 | nfs_list_remove_request(req); | |
1005 | nfs_redirty_request(req); | |
1006 | } | |
1007 | ret = -ENOMEM; | |
1008 | goto out; | |
1009 | } | |
1da177e4 | 1010 | pages = data->pagevec; |
1da177e4 LT |
1011 | while (!list_empty(head)) { |
1012 | req = nfs_list_entry(head->next); | |
1013 | nfs_list_remove_request(req); | |
1014 | nfs_list_add_request(req, &data->pages); | |
1da177e4 | 1015 | *pages++ = req->wb_page; |
1da177e4 LT |
1016 | } |
1017 | req = nfs_list_entry(data->pages.next); | |
1018 | ||
b31268ac TM |
1019 | if ((desc->pg_ioflags & FLUSH_COND_STABLE) && |
1020 | (desc->pg_moreio || NFS_I(desc->pg_inode)->ncommit)) | |
1021 | desc->pg_ioflags &= ~FLUSH_COND_STABLE; | |
1022 | ||
1da177e4 | 1023 | /* Set up the argument struct */ |
6e4efd56 | 1024 | nfs_write_rpcsetup(req, data, desc->pg_count, 0, desc->pg_ioflags); |
275acaaf | 1025 | list_add(&data->list, res); |
50828d7e | 1026 | desc->pg_rpc_callops = &nfs_write_full_ops; |
44b83799 | 1027 | out: |
44b83799 | 1028 | return ret; |
1da177e4 LT |
1029 | } |
1030 | ||
dce81290 TM |
1031 | int nfs_generic_flush(struct nfs_pageio_descriptor *desc, struct list_head *head) |
1032 | { | |
1033 | if (desc->pg_bsize < PAGE_CACHE_SIZE) | |
1034 | return nfs_flush_multi(desc, head); | |
1035 | return nfs_flush_one(desc, head); | |
1036 | } | |
1037 | ||
1038 | static int nfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc) | |
1751c363 | 1039 | { |
275acaaf TM |
1040 | LIST_HEAD(head); |
1041 | int ret; | |
1042 | ||
dce81290 | 1043 | ret = nfs_generic_flush(desc, &head); |
50828d7e TM |
1044 | if (ret == 0) |
1045 | ret = nfs_do_multiple_writes(&head, desc->pg_rpc_callops, | |
dce81290 | 1046 | desc->pg_ioflags); |
275acaaf | 1047 | return ret; |
1751c363 | 1048 | } |
1751c363 TM |
1049 | |
1050 | static const struct nfs_pageio_ops nfs_pageio_write_ops = { | |
1051 | .pg_test = nfs_generic_pg_test, | |
1052 | .pg_doio = nfs_generic_pg_writepages, | |
1053 | }; | |
1054 | ||
1f945357 | 1055 | static void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio, |
c63c7b05 | 1056 | struct inode *inode, int ioflags) |
1da177e4 | 1057 | { |
1751c363 TM |
1058 | nfs_pageio_init(pgio, inode, &nfs_pageio_write_ops, |
1059 | NFS_SERVER(inode)->wsize, ioflags); | |
1060 | } | |
1da177e4 | 1061 | |
dce81290 TM |
1062 | void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio) |
1063 | { | |
1064 | pgio->pg_ops = &nfs_pageio_write_ops; | |
1065 | pgio->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize; | |
1066 | } | |
1f945357 | 1067 | EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds); |
dce81290 | 1068 | |
1751c363 TM |
1069 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, |
1070 | struct inode *inode, int ioflags) | |
1071 | { | |
1072 | if (!pnfs_pageio_init_write(pgio, inode, ioflags)) | |
1073 | nfs_pageio_init_write_mds(pgio, inode, ioflags); | |
1da177e4 LT |
1074 | } |
1075 | ||
1076 | /* | |
1077 | * Handle a write reply that flushed part of a page. | |
1078 | */ | |
788e7a89 | 1079 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 1080 | { |
788e7a89 | 1081 | struct nfs_write_data *data = calldata; |
1da177e4 | 1082 | |
48186c7d CL |
1083 | dprintk("NFS: %5u write(%s/%lld %d@%lld)", |
1084 | task->tk_pid, | |
3d4ff43d | 1085 | data->req->wb_context->dentry->d_inode->i_sb->s_id, |
48186c7d | 1086 | (long long) |
3d4ff43d | 1087 | NFS_FILEID(data->req->wb_context->dentry->d_inode), |
48186c7d | 1088 | data->req->wb_bytes, (long long)req_offset(data->req)); |
1da177e4 | 1089 | |
c9d8f89d TM |
1090 | nfs_writeback_done(task, data); |
1091 | } | |
788e7a89 | 1092 | |
c9d8f89d TM |
1093 | static void nfs_writeback_release_partial(void *calldata) |
1094 | { | |
1095 | struct nfs_write_data *data = calldata; | |
1096 | struct nfs_page *req = data->req; | |
1097 | struct page *page = req->wb_page; | |
1098 | int status = data->task.tk_status; | |
1099 | ||
1100 | if (status < 0) { | |
a301b777 | 1101 | nfs_set_pageerror(page); |
c9d8f89d TM |
1102 | nfs_context_set_write_error(req->wb_context, status); |
1103 | dprintk(", error = %d\n", status); | |
8e821cad | 1104 | goto out; |
1da177e4 LT |
1105 | } |
1106 | ||
8e821cad | 1107 | if (nfs_write_need_commit(data)) { |
587142f8 | 1108 | struct inode *inode = page->mapping->host; |
8e821cad | 1109 | |
587142f8 | 1110 | spin_lock(&inode->i_lock); |
8e821cad TM |
1111 | if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { |
1112 | /* Do nothing we need to resend the writes */ | |
1113 | } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
1114 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1115 | dprintk(" defer commit\n"); | |
1116 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
1117 | set_bit(PG_NEED_RESCHED, &req->wb_flags); | |
1118 | clear_bit(PG_NEED_COMMIT, &req->wb_flags); | |
1119 | dprintk(" server reboot detected\n"); | |
1120 | } | |
587142f8 | 1121 | spin_unlock(&inode->i_lock); |
8e821cad TM |
1122 | } else |
1123 | dprintk(" OK\n"); | |
1124 | ||
1125 | out: | |
1da177e4 | 1126 | if (atomic_dec_and_test(&req->wb_complete)) |
a861a1e1 | 1127 | nfs_writepage_release(req, data); |
c9d8f89d | 1128 | nfs_writedata_release(calldata); |
1da177e4 LT |
1129 | } |
1130 | ||
def6ed7e AA |
1131 | #if defined(CONFIG_NFS_V4_1) |
1132 | void nfs_write_prepare(struct rpc_task *task, void *calldata) | |
1133 | { | |
1134 | struct nfs_write_data *data = calldata; | |
def6ed7e | 1135 | |
035168ab TM |
1136 | if (nfs4_setup_sequence(NFS_SERVER(data->inode), |
1137 | &data->args.seq_args, | |
def6ed7e AA |
1138 | &data->res.seq_res, 1, task)) |
1139 | return; | |
1140 | rpc_call_start(task); | |
1141 | } | |
1142 | #endif /* CONFIG_NFS_V4_1 */ | |
1143 | ||
788e7a89 | 1144 | static const struct rpc_call_ops nfs_write_partial_ops = { |
def6ed7e AA |
1145 | #if defined(CONFIG_NFS_V4_1) |
1146 | .rpc_call_prepare = nfs_write_prepare, | |
1147 | #endif /* CONFIG_NFS_V4_1 */ | |
788e7a89 | 1148 | .rpc_call_done = nfs_writeback_done_partial, |
c9d8f89d | 1149 | .rpc_release = nfs_writeback_release_partial, |
788e7a89 TM |
1150 | }; |
1151 | ||
1da177e4 LT |
1152 | /* |
1153 | * Handle a write reply that flushes a whole page. | |
1154 | * | |
1155 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
1156 | * writebacks since the page->count is kept > 1 for as long | |
1157 | * as the page has a write request pending. | |
1158 | */ | |
788e7a89 | 1159 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 1160 | { |
788e7a89 | 1161 | struct nfs_write_data *data = calldata; |
1da177e4 | 1162 | |
c9d8f89d TM |
1163 | nfs_writeback_done(task, data); |
1164 | } | |
1165 | ||
1166 | static void nfs_writeback_release_full(void *calldata) | |
1167 | { | |
1168 | struct nfs_write_data *data = calldata; | |
8ce160c5 PT |
1169 | int ret, status = data->task.tk_status; |
1170 | struct nfs_pageio_descriptor pgio; | |
1171 | ||
1172 | if (data->pnfs_error) { | |
1173 | nfs_pageio_init_write_mds(&pgio, data->inode, FLUSH_STABLE); | |
1174 | pgio.pg_recoalesce = 1; | |
1175 | } | |
788e7a89 | 1176 | |
1da177e4 LT |
1177 | /* Update attributes as result of writeback. */ |
1178 | while (!list_empty(&data->pages)) { | |
c9d8f89d TM |
1179 | struct nfs_page *req = nfs_list_entry(data->pages.next); |
1180 | struct page *page = req->wb_page; | |
1181 | ||
1da177e4 | 1182 | nfs_list_remove_request(req); |
1da177e4 | 1183 | |
48186c7d CL |
1184 | dprintk("NFS: %5u write (%s/%lld %d@%lld)", |
1185 | data->task.tk_pid, | |
3d4ff43d AV |
1186 | req->wb_context->dentry->d_inode->i_sb->s_id, |
1187 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1da177e4 LT |
1188 | req->wb_bytes, |
1189 | (long long)req_offset(req)); | |
1190 | ||
8ce160c5 PT |
1191 | if (data->pnfs_error) { |
1192 | dprintk(", pnfs error = %d\n", data->pnfs_error); | |
1193 | goto next; | |
1194 | } | |
1195 | ||
c9d8f89d | 1196 | if (status < 0) { |
a301b777 | 1197 | nfs_set_pageerror(page); |
c9d8f89d TM |
1198 | nfs_context_set_write_error(req->wb_context, status); |
1199 | dprintk(", error = %d\n", status); | |
8e821cad | 1200 | goto remove_request; |
1da177e4 | 1201 | } |
1da177e4 | 1202 | |
8e821cad TM |
1203 | if (nfs_write_need_commit(data)) { |
1204 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
a861a1e1 | 1205 | nfs_mark_request_commit(req, data->lseg); |
8e821cad | 1206 | dprintk(" marked for commit\n"); |
1da177e4 LT |
1207 | goto next; |
1208 | } | |
8e821cad TM |
1209 | dprintk(" OK\n"); |
1210 | remove_request: | |
1da177e4 | 1211 | nfs_inode_remove_request(req); |
1da177e4 | 1212 | next: |
9fd367f0 | 1213 | nfs_clear_page_tag_locked(req); |
a6305ddb | 1214 | nfs_end_page_writeback(page); |
8ce160c5 PT |
1215 | if (data->pnfs_error) { |
1216 | lock_page(page); | |
1217 | nfs_pageio_cond_complete(&pgio, page->index); | |
1218 | ret = nfs_page_async_flush(&pgio, page, 0); | |
1219 | if (ret) { | |
1220 | nfs_set_pageerror(page); | |
1221 | dprintk("rewrite to MDS error = %d\n", ret); | |
1222 | } | |
1223 | unlock_page(page); | |
1224 | } | |
1da177e4 | 1225 | } |
8ce160c5 PT |
1226 | if (data->pnfs_error) |
1227 | nfs_pageio_complete(&pgio); | |
c9d8f89d | 1228 | nfs_writedata_release(calldata); |
1da177e4 LT |
1229 | } |
1230 | ||
788e7a89 | 1231 | static const struct rpc_call_ops nfs_write_full_ops = { |
def6ed7e AA |
1232 | #if defined(CONFIG_NFS_V4_1) |
1233 | .rpc_call_prepare = nfs_write_prepare, | |
1234 | #endif /* CONFIG_NFS_V4_1 */ | |
788e7a89 | 1235 | .rpc_call_done = nfs_writeback_done_full, |
c9d8f89d | 1236 | .rpc_release = nfs_writeback_release_full, |
788e7a89 TM |
1237 | }; |
1238 | ||
1239 | ||
1da177e4 LT |
1240 | /* |
1241 | * This function is called when the WRITE call is complete. | |
1242 | */ | |
13602896 | 1243 | void nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1244 | { |
1da177e4 LT |
1245 | struct nfs_writeargs *argp = &data->args; |
1246 | struct nfs_writeres *resp = &data->res; | |
788e7a89 | 1247 | int status; |
1da177e4 | 1248 | |
a3f565b1 | 1249 | dprintk("NFS: %5u nfs_writeback_done (status %d)\n", |
1da177e4 LT |
1250 | task->tk_pid, task->tk_status); |
1251 | ||
f551e44f CL |
1252 | /* |
1253 | * ->write_done will attempt to use post-op attributes to detect | |
1254 | * conflicting writes by other clients. A strict interpretation | |
1255 | * of close-to-open would allow us to continue caching even if | |
1256 | * another writer had changed the file, but some applications | |
1257 | * depend on tighter cache coherency when writing. | |
1258 | */ | |
788e7a89 TM |
1259 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1260 | if (status != 0) | |
13602896 | 1261 | return; |
91d5b470 CL |
1262 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1263 | ||
1da177e4 LT |
1264 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1265 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1266 | /* We tried a write call, but the server did not | |
1267 | * commit data to stable storage even though we | |
1268 | * requested it. | |
1269 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1270 | * the server reports NFS_DATA_SYNC, but performs | |
1271 | * NFS_FILE_SYNC. We therefore implement this checking | |
1272 | * as a dprintk() in order to avoid filling syslog. | |
1273 | */ | |
1274 | static unsigned long complain; | |
1275 | ||
a69aef14 | 1276 | /* Note this will print the MDS for a DS write */ |
1da177e4 | 1277 | if (time_before(complain, jiffies)) { |
48186c7d | 1278 | dprintk("NFS: faulty NFS server %s:" |
1da177e4 | 1279 | " (committed = %d) != (stable = %d)\n", |
2b72c9cc | 1280 | NFS_SERVER(data->inode)->nfs_client->cl_hostname, |
1da177e4 LT |
1281 | resp->verf->committed, argp->stable); |
1282 | complain = jiffies + 300 * HZ; | |
1283 | } | |
1284 | } | |
1285 | #endif | |
1286 | /* Is this a short write? */ | |
1287 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1288 | static unsigned long complain; | |
1289 | ||
91d5b470 CL |
1290 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1291 | ||
1da177e4 LT |
1292 | /* Has the server at least made some progress? */ |
1293 | if (resp->count != 0) { | |
1294 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1295 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1296 | /* Resend from where the server left off */ | |
a69aef14 | 1297 | data->mds_offset += resp->count; |
1da177e4 LT |
1298 | argp->offset += resp->count; |
1299 | argp->pgbase += resp->count; | |
1300 | argp->count -= resp->count; | |
1301 | } else { | |
1302 | /* Resend as a stable write in order to avoid | |
1303 | * headaches in the case of a server crash. | |
1304 | */ | |
1305 | argp->stable = NFS_FILE_SYNC; | |
1306 | } | |
d00c5d43 | 1307 | rpc_restart_call_prepare(task); |
13602896 | 1308 | return; |
1da177e4 LT |
1309 | } |
1310 | if (time_before(complain, jiffies)) { | |
1311 | printk(KERN_WARNING | |
1312 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1313 | argp->count); | |
1314 | complain = jiffies + 300 * HZ; | |
1315 | } | |
1316 | /* Can't do anything about it except throw an error. */ | |
1317 | task->tk_status = -EIO; | |
1318 | } | |
13602896 | 1319 | return; |
1da177e4 LT |
1320 | } |
1321 | ||
1322 | ||
1323 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
71d0a611 TM |
1324 | static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait) |
1325 | { | |
b8413f98 TM |
1326 | int ret; |
1327 | ||
71d0a611 TM |
1328 | if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags)) |
1329 | return 1; | |
b8413f98 TM |
1330 | if (!may_wait) |
1331 | return 0; | |
1332 | ret = out_of_line_wait_on_bit_lock(&nfsi->flags, | |
1333 | NFS_INO_COMMIT, | |
1334 | nfs_wait_bit_killable, | |
1335 | TASK_KILLABLE); | |
1336 | return (ret < 0) ? ret : 1; | |
71d0a611 TM |
1337 | } |
1338 | ||
e0c2b380 | 1339 | void nfs_commit_clear_lock(struct nfs_inode *nfsi) |
71d0a611 TM |
1340 | { |
1341 | clear_bit(NFS_INO_COMMIT, &nfsi->flags); | |
1342 | smp_mb__after_clear_bit(); | |
1343 | wake_up_bit(&nfsi->flags, NFS_INO_COMMIT); | |
1344 | } | |
e0c2b380 | 1345 | EXPORT_SYMBOL_GPL(nfs_commit_clear_lock); |
71d0a611 | 1346 | |
e0c2b380 | 1347 | void nfs_commitdata_release(void *data) |
1da177e4 | 1348 | { |
383ba719 TM |
1349 | struct nfs_write_data *wdata = data; |
1350 | ||
988b6dce | 1351 | put_lseg(wdata->lseg); |
383ba719 | 1352 | put_nfs_open_context(wdata->args.context); |
1da177e4 LT |
1353 | nfs_commit_free(wdata); |
1354 | } | |
e0c2b380 | 1355 | EXPORT_SYMBOL_GPL(nfs_commitdata_release); |
1da177e4 | 1356 | |
e0c2b380 | 1357 | int nfs_initiate_commit(struct nfs_write_data *data, struct rpc_clnt *clnt, |
9ace33cd FI |
1358 | const struct rpc_call_ops *call_ops, |
1359 | int how) | |
1da177e4 | 1360 | { |
07737691 | 1361 | struct rpc_task *task; |
9ace33cd | 1362 | int priority = flush_task_priority(how); |
bdc7f021 TM |
1363 | struct rpc_message msg = { |
1364 | .rpc_argp = &data->args, | |
1365 | .rpc_resp = &data->res, | |
9ace33cd | 1366 | .rpc_cred = data->cred, |
bdc7f021 | 1367 | }; |
84115e1c | 1368 | struct rpc_task_setup task_setup_data = { |
07737691 | 1369 | .task = &data->task, |
9ace33cd | 1370 | .rpc_client = clnt, |
bdc7f021 | 1371 | .rpc_message = &msg, |
9ace33cd | 1372 | .callback_ops = call_ops, |
84115e1c | 1373 | .callback_data = data, |
101070ca | 1374 | .workqueue = nfsiod_workqueue, |
2c61be0a | 1375 | .flags = RPC_TASK_ASYNC, |
3ff7576d | 1376 | .priority = priority, |
84115e1c | 1377 | }; |
9ace33cd FI |
1378 | /* Set up the initial task struct. */ |
1379 | NFS_PROTO(data->inode)->commit_setup(data, &msg); | |
1380 | ||
1381 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); | |
1382 | ||
1383 | task = rpc_run_task(&task_setup_data); | |
1384 | if (IS_ERR(task)) | |
1385 | return PTR_ERR(task); | |
1386 | if (how & FLUSH_SYNC) | |
1387 | rpc_wait_for_completion_task(task); | |
1388 | rpc_put_task(task); | |
1389 | return 0; | |
1390 | } | |
e0c2b380 | 1391 | EXPORT_SYMBOL_GPL(nfs_initiate_commit); |
9ace33cd FI |
1392 | |
1393 | /* | |
1394 | * Set up the argument/result storage required for the RPC call. | |
1395 | */ | |
e0c2b380 | 1396 | void nfs_init_commit(struct nfs_write_data *data, |
988b6dce FI |
1397 | struct list_head *head, |
1398 | struct pnfs_layout_segment *lseg) | |
9ace33cd FI |
1399 | { |
1400 | struct nfs_page *first = nfs_list_entry(head->next); | |
3d4ff43d | 1401 | struct inode *inode = first->wb_context->dentry->d_inode; |
1da177e4 LT |
1402 | |
1403 | /* Set up the RPC argument and reply structs | |
1404 | * NB: take care not to mess about with data->commit et al. */ | |
1405 | ||
1406 | list_splice_init(head, &data->pages); | |
1da177e4 | 1407 | |
1da177e4 | 1408 | data->inode = inode; |
9ace33cd | 1409 | data->cred = first->wb_context->cred; |
988b6dce | 1410 | data->lseg = lseg; /* reference transferred */ |
9ace33cd | 1411 | data->mds_ops = &nfs_commit_ops; |
1da177e4 LT |
1412 | |
1413 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1414 | /* Note: we always request a commit of the entire inode */ |
1415 | data->args.offset = 0; | |
1416 | data->args.count = 0; | |
383ba719 | 1417 | data->args.context = get_nfs_open_context(first->wb_context); |
3da28eb1 | 1418 | data->res.count = 0; |
1da177e4 LT |
1419 | data->res.fattr = &data->fattr; |
1420 | data->res.verf = &data->verf; | |
0e574af1 | 1421 | nfs_fattr_init(&data->fattr); |
1da177e4 | 1422 | } |
e0c2b380 | 1423 | EXPORT_SYMBOL_GPL(nfs_init_commit); |
1da177e4 | 1424 | |
e0c2b380 | 1425 | void nfs_retry_commit(struct list_head *page_list, |
a861a1e1 | 1426 | struct pnfs_layout_segment *lseg) |
64bfeb49 FI |
1427 | { |
1428 | struct nfs_page *req; | |
1429 | ||
1430 | while (!list_empty(page_list)) { | |
1431 | req = nfs_list_entry(page_list->next); | |
1432 | nfs_list_remove_request(req); | |
a861a1e1 | 1433 | nfs_mark_request_commit(req, lseg); |
64bfeb49 FI |
1434 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
1435 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, | |
1436 | BDI_RECLAIMABLE); | |
1437 | nfs_clear_page_tag_locked(req); | |
1438 | } | |
1439 | } | |
e0c2b380 | 1440 | EXPORT_SYMBOL_GPL(nfs_retry_commit); |
64bfeb49 | 1441 | |
1da177e4 LT |
1442 | /* |
1443 | * Commit dirty pages | |
1444 | */ | |
1445 | static int | |
40859d7e | 1446 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1447 | { |
1448 | struct nfs_write_data *data; | |
1da177e4 | 1449 | |
c9d8f89d | 1450 | data = nfs_commitdata_alloc(); |
1da177e4 LT |
1451 | |
1452 | if (!data) | |
1453 | goto out_bad; | |
1454 | ||
1455 | /* Set up the argument struct */ | |
988b6dce | 1456 | nfs_init_commit(data, head, NULL); |
9ace33cd | 1457 | return nfs_initiate_commit(data, NFS_CLIENT(inode), data->mds_ops, how); |
1da177e4 | 1458 | out_bad: |
a861a1e1 | 1459 | nfs_retry_commit(head, NULL); |
71d0a611 | 1460 | nfs_commit_clear_lock(NFS_I(inode)); |
1da177e4 LT |
1461 | return -ENOMEM; |
1462 | } | |
1463 | ||
1464 | /* | |
1465 | * COMMIT call returned | |
1466 | */ | |
788e7a89 | 1467 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1468 | { |
963d8fe5 | 1469 | struct nfs_write_data *data = calldata; |
1da177e4 | 1470 | |
a3f565b1 | 1471 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
1da177e4 LT |
1472 | task->tk_pid, task->tk_status); |
1473 | ||
788e7a89 | 1474 | /* Call the NFS version-specific code */ |
c0d0e96b | 1475 | NFS_PROTO(data->inode)->commit_done(task, data); |
c9d8f89d TM |
1476 | } |
1477 | ||
e0c2b380 | 1478 | void nfs_commit_release_pages(struct nfs_write_data *data) |
c9d8f89d | 1479 | { |
5917ce84 | 1480 | struct nfs_page *req; |
c9d8f89d | 1481 | int status = data->task.tk_status; |
788e7a89 | 1482 | |
1da177e4 LT |
1483 | while (!list_empty(&data->pages)) { |
1484 | req = nfs_list_entry(data->pages.next); | |
1485 | nfs_list_remove_request(req); | |
e468bae9 | 1486 | nfs_clear_request_commit(req); |
1da177e4 | 1487 | |
48186c7d | 1488 | dprintk("NFS: commit (%s/%lld %d@%lld)", |
3d4ff43d AV |
1489 | req->wb_context->dentry->d_sb->s_id, |
1490 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1da177e4 LT |
1491 | req->wb_bytes, |
1492 | (long long)req_offset(req)); | |
c9d8f89d TM |
1493 | if (status < 0) { |
1494 | nfs_context_set_write_error(req->wb_context, status); | |
1da177e4 | 1495 | nfs_inode_remove_request(req); |
c9d8f89d | 1496 | dprintk(", error = %d\n", status); |
1da177e4 LT |
1497 | goto next; |
1498 | } | |
1499 | ||
1500 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1501 | * returned by the server against all stored verfs. */ | |
1502 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1503 | /* We have a match */ | |
1504 | nfs_inode_remove_request(req); | |
1505 | dprintk(" OK\n"); | |
1506 | goto next; | |
1507 | } | |
1508 | /* We have a mismatch. Write the page again */ | |
1509 | dprintk(" mismatch\n"); | |
6d884e8f | 1510 | nfs_mark_request_dirty(req); |
1da177e4 | 1511 | next: |
9fd367f0 | 1512 | nfs_clear_page_tag_locked(req); |
1da177e4 | 1513 | } |
5917ce84 | 1514 | } |
e0c2b380 | 1515 | EXPORT_SYMBOL_GPL(nfs_commit_release_pages); |
5917ce84 FI |
1516 | |
1517 | static void nfs_commit_release(void *calldata) | |
1518 | { | |
1519 | struct nfs_write_data *data = calldata; | |
1520 | ||
1521 | nfs_commit_release_pages(data); | |
71d0a611 | 1522 | nfs_commit_clear_lock(NFS_I(data->inode)); |
c9d8f89d | 1523 | nfs_commitdata_release(calldata); |
1da177e4 | 1524 | } |
788e7a89 TM |
1525 | |
1526 | static const struct rpc_call_ops nfs_commit_ops = { | |
21d9a851 AA |
1527 | #if defined(CONFIG_NFS_V4_1) |
1528 | .rpc_call_prepare = nfs_write_prepare, | |
1529 | #endif /* CONFIG_NFS_V4_1 */ | |
788e7a89 TM |
1530 | .rpc_call_done = nfs_commit_done, |
1531 | .rpc_release = nfs_commit_release, | |
1532 | }; | |
1da177e4 | 1533 | |
b608b283 | 1534 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 | 1535 | { |
1da177e4 | 1536 | LIST_HEAD(head); |
71d0a611 | 1537 | int may_wait = how & FLUSH_SYNC; |
b8413f98 | 1538 | int res; |
1da177e4 | 1539 | |
b8413f98 TM |
1540 | res = nfs_commit_set_lock(NFS_I(inode), may_wait); |
1541 | if (res <= 0) | |
c5efa5fc | 1542 | goto out_mark_dirty; |
3da28eb1 | 1543 | res = nfs_scan_commit(inode, &head, 0, 0); |
1da177e4 | 1544 | if (res) { |
a861a1e1 FI |
1545 | int error; |
1546 | ||
1547 | error = pnfs_commit_list(inode, &head, how); | |
1548 | if (error == PNFS_NOT_ATTEMPTED) | |
1549 | error = nfs_commit_list(inode, &head, how); | |
3da28eb1 TM |
1550 | if (error < 0) |
1551 | return error; | |
b8413f98 | 1552 | if (!may_wait) |
c5efa5fc | 1553 | goto out_mark_dirty; |
b8413f98 TM |
1554 | error = wait_on_bit(&NFS_I(inode)->flags, |
1555 | NFS_INO_COMMIT, | |
1556 | nfs_wait_bit_killable, | |
1557 | TASK_KILLABLE); | |
1558 | if (error < 0) | |
1559 | return error; | |
71d0a611 TM |
1560 | } else |
1561 | nfs_commit_clear_lock(NFS_I(inode)); | |
c5efa5fc TM |
1562 | return res; |
1563 | /* Note: If we exit without ensuring that the commit is complete, | |
1564 | * we must mark the inode as dirty. Otherwise, future calls to | |
1565 | * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure | |
1566 | * that the data is on the disk. | |
1567 | */ | |
1568 | out_mark_dirty: | |
1569 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); | |
1da177e4 LT |
1570 | return res; |
1571 | } | |
8fc795f7 TM |
1572 | |
1573 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) | |
1574 | { | |
420e3646 TM |
1575 | struct nfs_inode *nfsi = NFS_I(inode); |
1576 | int flags = FLUSH_SYNC; | |
1577 | int ret = 0; | |
8fc795f7 | 1578 | |
3236c3e1 JL |
1579 | /* no commits means nothing needs to be done */ |
1580 | if (!nfsi->ncommit) | |
1581 | return ret; | |
1582 | ||
a00dd6c0 JL |
1583 | if (wbc->sync_mode == WB_SYNC_NONE) { |
1584 | /* Don't commit yet if this is a non-blocking flush and there | |
1585 | * are a lot of outstanding writes for this mapping. | |
1586 | */ | |
1587 | if (nfsi->ncommit <= (nfsi->npages >> 1)) | |
1588 | goto out_mark_dirty; | |
420e3646 | 1589 | |
a00dd6c0 | 1590 | /* don't wait for the COMMIT response */ |
420e3646 | 1591 | flags = 0; |
a00dd6c0 JL |
1592 | } |
1593 | ||
420e3646 TM |
1594 | ret = nfs_commit_inode(inode, flags); |
1595 | if (ret >= 0) { | |
1596 | if (wbc->sync_mode == WB_SYNC_NONE) { | |
1597 | if (ret < wbc->nr_to_write) | |
1598 | wbc->nr_to_write -= ret; | |
1599 | else | |
1600 | wbc->nr_to_write = 0; | |
1601 | } | |
8fc795f7 | 1602 | return 0; |
420e3646 TM |
1603 | } |
1604 | out_mark_dirty: | |
8fc795f7 TM |
1605 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1606 | return ret; | |
1607 | } | |
c63c7b05 | 1608 | #else |
8fc795f7 TM |
1609 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) |
1610 | { | |
1611 | return 0; | |
1612 | } | |
1da177e4 LT |
1613 | #endif |
1614 | ||
8fc795f7 TM |
1615 | int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1616 | { | |
863a3c6c AA |
1617 | int ret; |
1618 | ||
1619 | ret = nfs_commit_unstable_pages(inode, wbc); | |
1620 | if (ret >= 0 && test_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(inode)->flags)) { | |
ef311537 AA |
1621 | int status; |
1622 | bool sync = true; | |
863a3c6c | 1623 | |
846d5a09 | 1624 | if (wbc->sync_mode == WB_SYNC_NONE) |
ef311537 | 1625 | sync = false; |
863a3c6c AA |
1626 | |
1627 | status = pnfs_layoutcommit_inode(inode, sync); | |
1628 | if (status < 0) | |
1629 | return status; | |
1630 | } | |
1631 | return ret; | |
8fc795f7 TM |
1632 | } |
1633 | ||
acdc53b2 TM |
1634 | /* |
1635 | * flush the inode to disk. | |
1636 | */ | |
1637 | int nfs_wb_all(struct inode *inode) | |
34901f70 TM |
1638 | { |
1639 | struct writeback_control wbc = { | |
72cb77f4 | 1640 | .sync_mode = WB_SYNC_ALL, |
34901f70 | 1641 | .nr_to_write = LONG_MAX, |
d7fb1207 TM |
1642 | .range_start = 0, |
1643 | .range_end = LLONG_MAX, | |
34901f70 | 1644 | }; |
34901f70 | 1645 | |
acdc53b2 | 1646 | return sync_inode(inode, &wbc); |
1c75950b TM |
1647 | } |
1648 | ||
1b3b4a1a TM |
1649 | int nfs_wb_page_cancel(struct inode *inode, struct page *page) |
1650 | { | |
1651 | struct nfs_page *req; | |
1b3b4a1a TM |
1652 | int ret = 0; |
1653 | ||
1654 | BUG_ON(!PageLocked(page)); | |
1655 | for (;;) { | |
ba8b06e6 | 1656 | wait_on_page_writeback(page); |
1b3b4a1a TM |
1657 | req = nfs_page_find_request(page); |
1658 | if (req == NULL) | |
1b3b4a1a | 1659 | break; |
1b3b4a1a TM |
1660 | if (nfs_lock_request_dontget(req)) { |
1661 | nfs_inode_remove_request(req); | |
1662 | /* | |
1663 | * In case nfs_inode_remove_request has marked the | |
1664 | * page as being dirty | |
1665 | */ | |
1666 | cancel_dirty_page(page, PAGE_CACHE_SIZE); | |
1667 | nfs_unlock_request(req); | |
1668 | break; | |
1669 | } | |
1670 | ret = nfs_wait_on_request(req); | |
c9edda71 | 1671 | nfs_release_request(req); |
1b3b4a1a | 1672 | if (ret < 0) |
c988950e | 1673 | break; |
1b3b4a1a | 1674 | } |
1b3b4a1a TM |
1675 | return ret; |
1676 | } | |
1677 | ||
7f2f12d9 TM |
1678 | /* |
1679 | * Write back all requests on one page - we do this before reading it. | |
1680 | */ | |
1681 | int nfs_wb_page(struct inode *inode, struct page *page) | |
1c75950b TM |
1682 | { |
1683 | loff_t range_start = page_offset(page); | |
1684 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
4d770ccf | 1685 | struct writeback_control wbc = { |
4d770ccf | 1686 | .sync_mode = WB_SYNC_ALL, |
7f2f12d9 | 1687 | .nr_to_write = 0, |
4d770ccf TM |
1688 | .range_start = range_start, |
1689 | .range_end = range_end, | |
1690 | }; | |
1691 | int ret; | |
1c75950b | 1692 | |
0522f6ad | 1693 | for (;;) { |
ba8b06e6 | 1694 | wait_on_page_writeback(page); |
73e3302f TM |
1695 | if (clear_page_dirty_for_io(page)) { |
1696 | ret = nfs_writepage_locked(page, &wbc); | |
1697 | if (ret < 0) | |
1698 | goto out_error; | |
0522f6ad | 1699 | continue; |
7f2f12d9 | 1700 | } |
0522f6ad TM |
1701 | if (!PagePrivate(page)) |
1702 | break; | |
1703 | ret = nfs_commit_inode(inode, FLUSH_SYNC); | |
ba8b06e6 | 1704 | if (ret < 0) |
73e3302f | 1705 | goto out_error; |
7f2f12d9 | 1706 | } |
73e3302f TM |
1707 | return 0; |
1708 | out_error: | |
4d770ccf | 1709 | return ret; |
1c75950b TM |
1710 | } |
1711 | ||
074cc1de TM |
1712 | #ifdef CONFIG_MIGRATION |
1713 | int nfs_migrate_page(struct address_space *mapping, struct page *newpage, | |
1714 | struct page *page) | |
1715 | { | |
2da95652 JL |
1716 | /* |
1717 | * If PagePrivate is set, then the page is currently associated with | |
1718 | * an in-progress read or write request. Don't try to migrate it. | |
1719 | * | |
1720 | * FIXME: we could do this in principle, but we'll need a way to ensure | |
1721 | * that we can safely release the inode reference while holding | |
1722 | * the page lock. | |
1723 | */ | |
1724 | if (PagePrivate(page)) | |
1725 | return -EBUSY; | |
074cc1de | 1726 | |
7549ad5f | 1727 | nfs_fscache_release_page(page, GFP_KERNEL); |
074cc1de | 1728 | |
2da95652 | 1729 | return migrate_page(mapping, newpage, page); |
074cc1de TM |
1730 | } |
1731 | #endif | |
1732 | ||
f7b422b1 | 1733 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1734 | { |
1735 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1736 | sizeof(struct nfs_write_data), | |
1737 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1738 | NULL); |
1da177e4 LT |
1739 | if (nfs_wdata_cachep == NULL) |
1740 | return -ENOMEM; | |
1741 | ||
93d2341c MD |
1742 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1743 | nfs_wdata_cachep); | |
1da177e4 LT |
1744 | if (nfs_wdata_mempool == NULL) |
1745 | return -ENOMEM; | |
1746 | ||
93d2341c MD |
1747 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1748 | nfs_wdata_cachep); | |
1da177e4 LT |
1749 | if (nfs_commit_mempool == NULL) |
1750 | return -ENOMEM; | |
1751 | ||
89a09141 PZ |
1752 | /* |
1753 | * NFS congestion size, scale with available memory. | |
1754 | * | |
1755 | * 64MB: 8192k | |
1756 | * 128MB: 11585k | |
1757 | * 256MB: 16384k | |
1758 | * 512MB: 23170k | |
1759 | * 1GB: 32768k | |
1760 | * 2GB: 46340k | |
1761 | * 4GB: 65536k | |
1762 | * 8GB: 92681k | |
1763 | * 16GB: 131072k | |
1764 | * | |
1765 | * This allows larger machines to have larger/more transfers. | |
1766 | * Limit the default to 256M | |
1767 | */ | |
1768 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); | |
1769 | if (nfs_congestion_kb > 256*1024) | |
1770 | nfs_congestion_kb = 256*1024; | |
1771 | ||
1da177e4 LT |
1772 | return 0; |
1773 | } | |
1774 | ||
266bee88 | 1775 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1776 | { |
1777 | mempool_destroy(nfs_commit_mempool); | |
1778 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1779 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1780 | } |
1781 |