Commit | Line | Data |
---|---|---|
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 | { |
383ba719 | 103 | put_nfs_open_context(wdata->args.context); |
1da177e4 LT |
104 | nfs_writedata_free(wdata); |
105 | } | |
106 | ||
7b159fc1 TM |
107 | static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error) |
108 | { | |
109 | ctx->error = error; | |
110 | smp_wmb(); | |
111 | set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
112 | } | |
113 | ||
277459d2 TM |
114 | static struct nfs_page *nfs_page_find_request_locked(struct page *page) |
115 | { | |
116 | struct nfs_page *req = NULL; | |
117 | ||
118 | if (PagePrivate(page)) { | |
119 | req = (struct nfs_page *)page_private(page); | |
120 | if (req != NULL) | |
c03b4024 | 121 | kref_get(&req->wb_kref); |
277459d2 TM |
122 | } |
123 | return req; | |
124 | } | |
125 | ||
126 | static struct nfs_page *nfs_page_find_request(struct page *page) | |
127 | { | |
587142f8 | 128 | struct inode *inode = page->mapping->host; |
277459d2 | 129 | struct nfs_page *req = NULL; |
277459d2 | 130 | |
587142f8 | 131 | spin_lock(&inode->i_lock); |
277459d2 | 132 | req = nfs_page_find_request_locked(page); |
587142f8 | 133 | spin_unlock(&inode->i_lock); |
277459d2 TM |
134 | return req; |
135 | } | |
136 | ||
1da177e4 LT |
137 | /* Adjust the file length if we're writing beyond the end */ |
138 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) | |
139 | { | |
140 | struct inode *inode = page->mapping->host; | |
a3d01454 TM |
141 | loff_t end, i_size; |
142 | pgoff_t end_index; | |
1da177e4 | 143 | |
a3d01454 TM |
144 | spin_lock(&inode->i_lock); |
145 | i_size = i_size_read(inode); | |
146 | end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; | |
1da177e4 | 147 | if (i_size > 0 && page->index < end_index) |
a3d01454 | 148 | goto out; |
1da177e4 LT |
149 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); |
150 | if (i_size >= end) | |
a3d01454 | 151 | goto out; |
1da177e4 | 152 | i_size_write(inode, end); |
a3d01454 TM |
153 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
154 | out: | |
155 | spin_unlock(&inode->i_lock); | |
1da177e4 LT |
156 | } |
157 | ||
a301b777 TM |
158 | /* A writeback failed: mark the page as bad, and invalidate the page cache */ |
159 | static void nfs_set_pageerror(struct page *page) | |
160 | { | |
161 | SetPageError(page); | |
162 | nfs_zap_mapping(page->mapping->host, page->mapping); | |
163 | } | |
164 | ||
1da177e4 LT |
165 | /* We can set the PG_uptodate flag if we see that a write request |
166 | * covers the full page. | |
167 | */ | |
168 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) | |
169 | { | |
1da177e4 LT |
170 | if (PageUptodate(page)) |
171 | return; | |
172 | if (base != 0) | |
173 | return; | |
49a70f27 | 174 | if (count != nfs_page_length(page)) |
1da177e4 | 175 | return; |
49a70f27 | 176 | SetPageUptodate(page); |
1da177e4 LT |
177 | } |
178 | ||
1da177e4 LT |
179 | static int wb_priority(struct writeback_control *wbc) |
180 | { | |
181 | if (wbc->for_reclaim) | |
c63c7b05 | 182 | return FLUSH_HIGHPRI | FLUSH_STABLE; |
b17621fe | 183 | if (wbc->for_kupdate || wbc->for_background) |
b31268ac TM |
184 | return FLUSH_LOWPRI | FLUSH_COND_STABLE; |
185 | return FLUSH_COND_STABLE; | |
1da177e4 LT |
186 | } |
187 | ||
89a09141 PZ |
188 | /* |
189 | * NFS congestion control | |
190 | */ | |
191 | ||
192 | int nfs_congestion_kb; | |
193 | ||
194 | #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) | |
195 | #define NFS_CONGESTION_OFF_THRESH \ | |
196 | (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) | |
197 | ||
5a6d41b3 | 198 | static int nfs_set_page_writeback(struct page *page) |
89a09141 | 199 | { |
5a6d41b3 TM |
200 | int ret = test_set_page_writeback(page); |
201 | ||
202 | if (!ret) { | |
89a09141 PZ |
203 | struct inode *inode = page->mapping->host; |
204 | struct nfs_server *nfss = NFS_SERVER(inode); | |
205 | ||
a6305ddb | 206 | page_cache_get(page); |
277866a0 | 207 | if (atomic_long_inc_return(&nfss->writeback) > |
8aa7e847 JA |
208 | NFS_CONGESTION_ON_THRESH) { |
209 | set_bdi_congested(&nfss->backing_dev_info, | |
210 | BLK_RW_ASYNC); | |
211 | } | |
89a09141 | 212 | } |
5a6d41b3 | 213 | return ret; |
89a09141 PZ |
214 | } |
215 | ||
216 | static void nfs_end_page_writeback(struct page *page) | |
217 | { | |
218 | struct inode *inode = page->mapping->host; | |
219 | struct nfs_server *nfss = NFS_SERVER(inode); | |
220 | ||
221 | end_page_writeback(page); | |
a6305ddb | 222 | page_cache_release(page); |
c4dc4bee | 223 | if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) |
8aa7e847 | 224 | clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC); |
89a09141 PZ |
225 | } |
226 | ||
cfb506e1 | 227 | static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock) |
e261f51f | 228 | { |
587142f8 | 229 | struct inode *inode = page->mapping->host; |
e261f51f | 230 | struct nfs_page *req; |
e261f51f TM |
231 | int ret; |
232 | ||
587142f8 | 233 | spin_lock(&inode->i_lock); |
074cc1de | 234 | for (;;) { |
e261f51f | 235 | req = nfs_page_find_request_locked(page); |
074cc1de TM |
236 | if (req == NULL) |
237 | break; | |
9994b62b | 238 | if (nfs_lock_request_dontget(req)) |
e261f51f TM |
239 | break; |
240 | /* Note: If we hold the page lock, as is the case in nfs_writepage, | |
9994b62b | 241 | * then the call to nfs_lock_request_dontget() will always |
e261f51f TM |
242 | * succeed provided that someone hasn't already marked the |
243 | * request as dirty (in which case we don't care). | |
244 | */ | |
587142f8 | 245 | spin_unlock(&inode->i_lock); |
cfb506e1 TM |
246 | if (!nonblock) |
247 | ret = nfs_wait_on_request(req); | |
248 | else | |
249 | ret = -EAGAIN; | |
e261f51f TM |
250 | nfs_release_request(req); |
251 | if (ret != 0) | |
074cc1de | 252 | return ERR_PTR(ret); |
587142f8 | 253 | spin_lock(&inode->i_lock); |
e261f51f | 254 | } |
587142f8 | 255 | spin_unlock(&inode->i_lock); |
074cc1de TM |
256 | return req; |
257 | } | |
258 | ||
259 | /* | |
260 | * Find an associated nfs write request, and prepare to flush it out | |
261 | * May return an error if the user signalled nfs_wait_on_request(). | |
262 | */ | |
263 | static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, | |
cfb506e1 | 264 | struct page *page, bool nonblock) |
074cc1de TM |
265 | { |
266 | struct nfs_page *req; | |
267 | int ret = 0; | |
268 | ||
cfb506e1 | 269 | req = nfs_find_and_lock_request(page, nonblock); |
074cc1de TM |
270 | if (!req) |
271 | goto out; | |
272 | ret = PTR_ERR(req); | |
273 | if (IS_ERR(req)) | |
274 | goto out; | |
275 | ||
276 | ret = nfs_set_page_writeback(page); | |
277 | BUG_ON(ret != 0); | |
278 | BUG_ON(test_bit(PG_CLEAN, &req->wb_flags)); | |
279 | ||
f8512ad0 FI |
280 | if (!nfs_pageio_add_request(pgio, req)) { |
281 | nfs_redirty_request(req); | |
074cc1de | 282 | ret = pgio->pg_error; |
f8512ad0 | 283 | } |
074cc1de TM |
284 | out: |
285 | return ret; | |
e261f51f TM |
286 | } |
287 | ||
f758c885 | 288 | static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) |
1da177e4 | 289 | { |
1da177e4 | 290 | struct inode *inode = page->mapping->host; |
cfb506e1 | 291 | int ret; |
1da177e4 | 292 | |
91d5b470 CL |
293 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
294 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
295 | ||
7fe7f848 | 296 | nfs_pageio_cond_complete(pgio, page->index); |
1b430bee | 297 | ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE); |
cfb506e1 TM |
298 | if (ret == -EAGAIN) { |
299 | redirty_page_for_writepage(wbc, page); | |
300 | ret = 0; | |
301 | } | |
302 | return ret; | |
f758c885 | 303 | } |
7fe7f848 | 304 | |
f758c885 TM |
305 | /* |
306 | * Write an mmapped page to the server. | |
307 | */ | |
308 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
309 | { | |
310 | struct nfs_pageio_descriptor pgio; | |
311 | int err; | |
49a70f27 | 312 | |
f758c885 TM |
313 | nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc)); |
314 | err = nfs_do_writepage(page, wbc, &pgio); | |
315 | nfs_pageio_complete(&pgio); | |
316 | if (err < 0) | |
317 | return err; | |
318 | if (pgio.pg_error < 0) | |
319 | return pgio.pg_error; | |
320 | return 0; | |
4d770ccf TM |
321 | } |
322 | ||
323 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
324 | { | |
f758c885 | 325 | int ret; |
4d770ccf | 326 | |
f758c885 | 327 | ret = nfs_writepage_locked(page, wbc); |
1da177e4 | 328 | unlock_page(page); |
f758c885 TM |
329 | return ret; |
330 | } | |
331 | ||
332 | static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) | |
333 | { | |
334 | int ret; | |
335 | ||
336 | ret = nfs_do_writepage(page, wbc, data); | |
337 | unlock_page(page); | |
338 | return ret; | |
1da177e4 LT |
339 | } |
340 | ||
1da177e4 LT |
341 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) |
342 | { | |
1da177e4 | 343 | struct inode *inode = mapping->host; |
72cb77f4 | 344 | unsigned long *bitlock = &NFS_I(inode)->flags; |
c63c7b05 | 345 | struct nfs_pageio_descriptor pgio; |
1da177e4 LT |
346 | int err; |
347 | ||
72cb77f4 TM |
348 | /* Stop dirtying of new pages while we sync */ |
349 | err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING, | |
350 | nfs_wait_bit_killable, TASK_KILLABLE); | |
351 | if (err) | |
352 | goto out_err; | |
353 | ||
91d5b470 CL |
354 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
355 | ||
c63c7b05 | 356 | nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); |
f758c885 | 357 | err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); |
c63c7b05 | 358 | nfs_pageio_complete(&pgio); |
72cb77f4 TM |
359 | |
360 | clear_bit_unlock(NFS_INO_FLUSHING, bitlock); | |
361 | smp_mb__after_clear_bit(); | |
362 | wake_up_bit(bitlock, NFS_INO_FLUSHING); | |
363 | ||
f758c885 | 364 | if (err < 0) |
72cb77f4 TM |
365 | goto out_err; |
366 | err = pgio.pg_error; | |
367 | if (err < 0) | |
368 | goto out_err; | |
c63c7b05 | 369 | return 0; |
72cb77f4 TM |
370 | out_err: |
371 | return err; | |
1da177e4 LT |
372 | } |
373 | ||
374 | /* | |
375 | * Insert a write request into an inode | |
376 | */ | |
d6d6dc7c | 377 | static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req) |
1da177e4 LT |
378 | { |
379 | struct nfs_inode *nfsi = NFS_I(inode); | |
e7d39069 TM |
380 | |
381 | /* Lock the request! */ | |
382 | nfs_lock_request_dontget(req); | |
383 | ||
384 | spin_lock(&inode->i_lock); | |
4d65c520 | 385 | if (!nfsi->npages && nfs_have_delegation(inode, FMODE_WRITE)) |
a9a4a87a | 386 | inode->i_version++; |
2df485a7 | 387 | set_bit(PG_MAPPED, &req->wb_flags); |
deb7d638 | 388 | SetPagePrivate(req->wb_page); |
277459d2 | 389 | set_page_private(req->wb_page, (unsigned long)req); |
1da177e4 | 390 | nfsi->npages++; |
c03b4024 | 391 | kref_get(&req->wb_kref); |
e7d39069 | 392 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
393 | } |
394 | ||
395 | /* | |
89a09141 | 396 | * Remove a write request from an inode |
1da177e4 LT |
397 | */ |
398 | static void nfs_inode_remove_request(struct nfs_page *req) | |
399 | { | |
3d4ff43d | 400 | struct inode *inode = req->wb_context->dentry->d_inode; |
1da177e4 LT |
401 | struct nfs_inode *nfsi = NFS_I(inode); |
402 | ||
403 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
404 | ||
587142f8 | 405 | spin_lock(&inode->i_lock); |
277459d2 | 406 | set_page_private(req->wb_page, 0); |
deb7d638 | 407 | ClearPagePrivate(req->wb_page); |
2df485a7 | 408 | clear_bit(PG_MAPPED, &req->wb_flags); |
1da177e4 | 409 | nfsi->npages--; |
4d65c520 | 410 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
411 | nfs_release_request(req); |
412 | } | |
413 | ||
61822ab5 | 414 | static void |
6d884e8f | 415 | nfs_mark_request_dirty(struct nfs_page *req) |
61822ab5 | 416 | { |
61822ab5 TM |
417 | __set_page_dirty_nobuffers(req->wb_page); |
418 | } | |
419 | ||
1da177e4 | 420 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
8dd37758 TM |
421 | /** |
422 | * nfs_request_add_commit_list - add request to a commit list | |
423 | * @req: pointer to a struct nfs_page | |
424 | * @head: commit list head | |
425 | * | |
426 | * This sets the PG_CLEAN bit, updates the inode global count of | |
427 | * number of outstanding requests requiring a commit as well as | |
428 | * the MM page stats. | |
429 | * | |
430 | * The caller must _not_ hold the inode->i_lock, but must be | |
431 | * holding the nfs_page lock. | |
1da177e4 | 432 | */ |
8dd37758 TM |
433 | void |
434 | nfs_request_add_commit_list(struct nfs_page *req, struct list_head *head) | |
1da177e4 | 435 | { |
3d4ff43d | 436 | struct inode *inode = req->wb_context->dentry->d_inode; |
1da177e4 | 437 | |
e468bae9 | 438 | set_bit(PG_CLEAN, &(req)->wb_flags); |
8dd37758 TM |
439 | spin_lock(&inode->i_lock); |
440 | nfs_list_add_request(req, head); | |
441 | NFS_I(inode)->ncommit++; | |
587142f8 | 442 | spin_unlock(&inode->i_lock); |
fd39fc85 | 443 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 | 444 | inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE); |
a1803044 | 445 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1da177e4 | 446 | } |
8dd37758 TM |
447 | EXPORT_SYMBOL_GPL(nfs_request_add_commit_list); |
448 | ||
449 | /** | |
450 | * nfs_request_remove_commit_list - Remove request from a commit list | |
451 | * @req: pointer to a nfs_page | |
452 | * | |
453 | * This clears the PG_CLEAN bit, and updates the inode global count of | |
454 | * number of outstanding requests requiring a commit | |
455 | * It does not update the MM page stats. | |
456 | * | |
457 | * The caller _must_ hold the inode->i_lock and the nfs_page lock. | |
458 | */ | |
459 | void | |
460 | nfs_request_remove_commit_list(struct nfs_page *req) | |
461 | { | |
462 | struct inode *inode = req->wb_context->dentry->d_inode; | |
463 | ||
464 | if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) | |
465 | return; | |
466 | nfs_list_remove_request(req); | |
467 | NFS_I(inode)->ncommit--; | |
468 | } | |
469 | EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list); | |
470 | ||
471 | ||
472 | /* | |
473 | * Add a request to the inode's commit list. | |
474 | */ | |
475 | static void | |
476 | nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg) | |
477 | { | |
478 | struct inode *inode = req->wb_context->dentry->d_inode; | |
479 | ||
480 | if (pnfs_mark_request_commit(req, lseg)) | |
481 | return; | |
482 | nfs_request_add_commit_list(req, &NFS_I(inode)->commit_list); | |
483 | } | |
8e821cad | 484 | |
d6d6dc7c FI |
485 | static void |
486 | nfs_clear_page_commit(struct page *page) | |
487 | { | |
488 | dec_zone_page_state(page, NR_UNSTABLE_NFS); | |
489 | dec_bdi_stat(page->mapping->backing_dev_info, BDI_RECLAIMABLE); | |
490 | } | |
491 | ||
8dd37758 | 492 | static void |
e468bae9 TM |
493 | nfs_clear_request_commit(struct nfs_page *req) |
494 | { | |
8dd37758 TM |
495 | if (test_bit(PG_CLEAN, &req->wb_flags)) { |
496 | struct inode *inode = req->wb_context->dentry->d_inode; | |
e468bae9 | 497 | |
8dd37758 TM |
498 | if (!pnfs_clear_request_commit(req)) { |
499 | spin_lock(&inode->i_lock); | |
500 | nfs_request_remove_commit_list(req); | |
501 | spin_unlock(&inode->i_lock); | |
502 | } | |
d6d6dc7c | 503 | nfs_clear_page_commit(req->wb_page); |
e468bae9 | 504 | } |
e468bae9 TM |
505 | } |
506 | ||
8e821cad TM |
507 | static inline |
508 | int nfs_write_need_commit(struct nfs_write_data *data) | |
509 | { | |
465d5243 FI |
510 | if (data->verf.committed == NFS_DATA_SYNC) |
511 | return data->lseg == NULL; | |
512 | else | |
513 | return data->verf.committed != NFS_FILE_SYNC; | |
8e821cad TM |
514 | } |
515 | ||
516 | static inline | |
a861a1e1 FI |
517 | int nfs_reschedule_unstable_write(struct nfs_page *req, |
518 | struct nfs_write_data *data) | |
8e821cad | 519 | { |
e468bae9 | 520 | if (test_and_clear_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
a861a1e1 | 521 | nfs_mark_request_commit(req, data->lseg); |
8e821cad TM |
522 | return 1; |
523 | } | |
524 | if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { | |
6d884e8f | 525 | nfs_mark_request_dirty(req); |
8e821cad TM |
526 | return 1; |
527 | } | |
528 | return 0; | |
529 | } | |
530 | #else | |
8dd37758 | 531 | static void |
a861a1e1 | 532 | nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg) |
8e821cad TM |
533 | { |
534 | } | |
535 | ||
8dd37758 | 536 | static void |
e468bae9 TM |
537 | nfs_clear_request_commit(struct nfs_page *req) |
538 | { | |
e468bae9 TM |
539 | } |
540 | ||
8e821cad TM |
541 | static inline |
542 | int nfs_write_need_commit(struct nfs_write_data *data) | |
543 | { | |
544 | return 0; | |
545 | } | |
546 | ||
547 | static inline | |
a861a1e1 FI |
548 | int nfs_reschedule_unstable_write(struct nfs_page *req, |
549 | struct nfs_write_data *data) | |
8e821cad TM |
550 | { |
551 | return 0; | |
552 | } | |
1da177e4 LT |
553 | #endif |
554 | ||
47c62564 | 555 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
fb8a1f11 TM |
556 | static int |
557 | nfs_need_commit(struct nfs_inode *nfsi) | |
558 | { | |
d6d6dc7c FI |
559 | return nfsi->ncommit > 0; |
560 | } | |
561 | ||
562 | /* i_lock held by caller */ | |
8dd37758 | 563 | static int |
3b3be88d TM |
564 | nfs_scan_commit_list(struct list_head *src, struct list_head *dst, int max, |
565 | spinlock_t *lock) | |
d6d6dc7c FI |
566 | { |
567 | struct nfs_page *req, *tmp; | |
568 | int ret = 0; | |
569 | ||
570 | list_for_each_entry_safe(req, tmp, src, wb_list) { | |
8dd37758 TM |
571 | if (!nfs_lock_request(req)) |
572 | continue; | |
3b3be88d TM |
573 | if (cond_resched_lock(lock)) |
574 | list_safe_reset_next(req, tmp, wb_list); | |
8dd37758 TM |
575 | nfs_request_remove_commit_list(req); |
576 | nfs_list_add_request(req, dst); | |
577 | ret++; | |
578 | if (ret == max) | |
579 | break; | |
d6d6dc7c FI |
580 | } |
581 | return ret; | |
fb8a1f11 TM |
582 | } |
583 | ||
1da177e4 LT |
584 | /* |
585 | * nfs_scan_commit - Scan an inode for commit requests | |
586 | * @inode: NFS inode to scan | |
587 | * @dst: destination list | |
1da177e4 LT |
588 | * |
589 | * Moves requests from the inode's 'commit' request list. | |
590 | * The requests are *not* checked to ensure that they form a contiguous set. | |
591 | */ | |
592 | static int | |
d6d6dc7c | 593 | nfs_scan_commit(struct inode *inode, struct list_head *dst) |
1da177e4 LT |
594 | { |
595 | struct nfs_inode *nfsi = NFS_I(inode); | |
d6d6dc7c | 596 | int ret = 0; |
fb8a1f11 | 597 | |
0d88f6e8 | 598 | spin_lock(&inode->i_lock); |
d6d6dc7c | 599 | if (nfsi->ncommit > 0) { |
8dd37758 | 600 | const int max = INT_MAX; |
d6d6dc7c | 601 | |
3b3be88d TM |
602 | ret = nfs_scan_commit_list(&nfsi->commit_list, dst, max, |
603 | &inode->i_lock); | |
604 | ret += pnfs_scan_commit_lists(inode, max - ret, | |
605 | &inode->i_lock); | |
d6d6dc7c | 606 | } |
0d88f6e8 | 607 | spin_unlock(&inode->i_lock); |
ff778d02 | 608 | return ret; |
1da177e4 | 609 | } |
d6d6dc7c | 610 | |
c42de9dd | 611 | #else |
fb8a1f11 TM |
612 | static inline int nfs_need_commit(struct nfs_inode *nfsi) |
613 | { | |
614 | return 0; | |
615 | } | |
616 | ||
d6d6dc7c | 617 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst) |
c42de9dd TM |
618 | { |
619 | return 0; | |
620 | } | |
1da177e4 LT |
621 | #endif |
622 | ||
1da177e4 | 623 | /* |
e7d39069 TM |
624 | * Search for an existing write request, and attempt to update |
625 | * it to reflect a new dirty region on a given page. | |
1da177e4 | 626 | * |
e7d39069 TM |
627 | * If the attempt fails, then the existing request is flushed out |
628 | * to disk. | |
1da177e4 | 629 | */ |
e7d39069 TM |
630 | static struct nfs_page *nfs_try_to_update_request(struct inode *inode, |
631 | struct page *page, | |
632 | unsigned int offset, | |
633 | unsigned int bytes) | |
1da177e4 | 634 | { |
e7d39069 TM |
635 | struct nfs_page *req; |
636 | unsigned int rqend; | |
637 | unsigned int end; | |
638 | int error; | |
639 | ||
640 | if (!PagePrivate(page)) | |
641 | return NULL; | |
1da177e4 LT |
642 | |
643 | end = offset + bytes; | |
e7d39069 | 644 | spin_lock(&inode->i_lock); |
1da177e4 | 645 | |
1da177e4 | 646 | for (;;) { |
277459d2 | 647 | req = nfs_page_find_request_locked(page); |
e7d39069 TM |
648 | if (req == NULL) |
649 | goto out_unlock; | |
650 | ||
651 | rqend = req->wb_offset + req->wb_bytes; | |
652 | /* | |
653 | * Tell the caller to flush out the request if | |
654 | * the offsets are non-contiguous. | |
655 | * Note: nfs_flush_incompatible() will already | |
656 | * have flushed out requests having wrong owners. | |
657 | */ | |
e468bae9 | 658 | if (offset > rqend |
e7d39069 TM |
659 | || end < req->wb_offset) |
660 | goto out_flushme; | |
661 | ||
9994b62b | 662 | if (nfs_lock_request_dontget(req)) |
1da177e4 | 663 | break; |
1da177e4 | 664 | |
e7d39069 | 665 | /* The request is locked, so wait and then retry */ |
587142f8 | 666 | spin_unlock(&inode->i_lock); |
e7d39069 TM |
667 | error = nfs_wait_on_request(req); |
668 | nfs_release_request(req); | |
669 | if (error != 0) | |
670 | goto out_err; | |
671 | spin_lock(&inode->i_lock); | |
1da177e4 LT |
672 | } |
673 | ||
674 | /* Okay, the request matches. Update the region */ | |
675 | if (offset < req->wb_offset) { | |
676 | req->wb_offset = offset; | |
677 | req->wb_pgbase = offset; | |
1da177e4 | 678 | } |
1da177e4 LT |
679 | if (end > rqend) |
680 | req->wb_bytes = end - req->wb_offset; | |
e7d39069 TM |
681 | else |
682 | req->wb_bytes = rqend - req->wb_offset; | |
683 | out_unlock: | |
684 | spin_unlock(&inode->i_lock); | |
8dd37758 | 685 | nfs_clear_request_commit(req); |
e7d39069 TM |
686 | return req; |
687 | out_flushme: | |
688 | spin_unlock(&inode->i_lock); | |
689 | nfs_release_request(req); | |
690 | error = nfs_wb_page(inode, page); | |
691 | out_err: | |
692 | return ERR_PTR(error); | |
693 | } | |
694 | ||
695 | /* | |
696 | * Try to update an existing write request, or create one if there is none. | |
697 | * | |
698 | * Note: Should always be called with the Page Lock held to prevent races | |
699 | * if we have to add a new request. Also assumes that the caller has | |
700 | * already called nfs_flush_incompatible() if necessary. | |
701 | */ | |
702 | static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx, | |
703 | struct page *page, unsigned int offset, unsigned int bytes) | |
704 | { | |
705 | struct inode *inode = page->mapping->host; | |
706 | struct nfs_page *req; | |
1da177e4 | 707 | |
e7d39069 TM |
708 | req = nfs_try_to_update_request(inode, page, offset, bytes); |
709 | if (req != NULL) | |
710 | goto out; | |
711 | req = nfs_create_request(ctx, inode, page, offset, bytes); | |
712 | if (IS_ERR(req)) | |
713 | goto out; | |
d6d6dc7c | 714 | nfs_inode_add_request(inode, req); |
efc91ed0 | 715 | out: |
61e930a9 | 716 | return req; |
1da177e4 LT |
717 | } |
718 | ||
e7d39069 TM |
719 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
720 | unsigned int offset, unsigned int count) | |
721 | { | |
722 | struct nfs_page *req; | |
723 | ||
724 | req = nfs_setup_write_request(ctx, page, offset, count); | |
725 | if (IS_ERR(req)) | |
726 | return PTR_ERR(req); | |
727 | /* Update file length */ | |
728 | nfs_grow_file(page, offset, count); | |
729 | nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); | |
a6305ddb | 730 | nfs_mark_request_dirty(req); |
9994b62b | 731 | nfs_unlock_request(req); |
e7d39069 TM |
732 | return 0; |
733 | } | |
734 | ||
1da177e4 LT |
735 | int nfs_flush_incompatible(struct file *file, struct page *page) |
736 | { | |
cd3758e3 | 737 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 738 | struct nfs_page *req; |
1a54533e | 739 | int do_flush, status; |
1da177e4 LT |
740 | /* |
741 | * Look for a request corresponding to this page. If there | |
742 | * is one, and it belongs to another file, we flush it out | |
743 | * before we try to copy anything into the page. Do this | |
744 | * due to the lack of an ACCESS-type call in NFSv2. | |
745 | * Also do the same if we find a request from an existing | |
746 | * dropped page. | |
747 | */ | |
1a54533e TM |
748 | do { |
749 | req = nfs_page_find_request(page); | |
750 | if (req == NULL) | |
751 | return 0; | |
f11ac8db TM |
752 | do_flush = req->wb_page != page || req->wb_context != ctx || |
753 | req->wb_lock_context->lockowner != current->files || | |
754 | req->wb_lock_context->pid != current->tgid; | |
1da177e4 | 755 | nfs_release_request(req); |
1a54533e TM |
756 | if (!do_flush) |
757 | return 0; | |
758 | status = nfs_wb_page(page->mapping->host, page); | |
759 | } while (status == 0); | |
760 | return status; | |
1da177e4 LT |
761 | } |
762 | ||
5d47a356 TM |
763 | /* |
764 | * If the page cache is marked as unsafe or invalid, then we can't rely on | |
765 | * the PageUptodate() flag. In this case, we will need to turn off | |
766 | * write optimisations that depend on the page contents being correct. | |
767 | */ | |
768 | static int nfs_write_pageuptodate(struct page *page, struct inode *inode) | |
769 | { | |
770 | return PageUptodate(page) && | |
771 | !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA)); | |
772 | } | |
773 | ||
1da177e4 LT |
774 | /* |
775 | * Update and possibly write a cached page of an NFS file. | |
776 | * | |
777 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
778 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
779 | */ | |
780 | int nfs_updatepage(struct file *file, struct page *page, | |
781 | unsigned int offset, unsigned int count) | |
782 | { | |
cd3758e3 | 783 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 784 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
785 | int status = 0; |
786 | ||
91d5b470 CL |
787 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
788 | ||
48186c7d | 789 | dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n", |
01cce933 JJS |
790 | file->f_path.dentry->d_parent->d_name.name, |
791 | file->f_path.dentry->d_name.name, count, | |
48186c7d | 792 | (long long)(page_offset(page) + offset)); |
1da177e4 | 793 | |
1da177e4 | 794 | /* If we're not using byte range locks, and we know the page |
5d47a356 TM |
795 | * is up to date, it may be more efficient to extend the write |
796 | * to cover the entire page in order to avoid fragmentation | |
797 | * inefficiencies. | |
1da177e4 | 798 | */ |
5d47a356 TM |
799 | if (nfs_write_pageuptodate(page, inode) && |
800 | inode->i_flock == NULL && | |
6b2f3d1f | 801 | !(file->f_flags & O_DSYNC)) { |
49a70f27 | 802 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 803 | offset = 0; |
1da177e4 LT |
804 | } |
805 | ||
e21195a7 | 806 | status = nfs_writepage_setup(ctx, page, offset, count); |
03fa9e84 TM |
807 | if (status < 0) |
808 | nfs_set_pageerror(page); | |
59b7c05f TM |
809 | else |
810 | __set_page_dirty_nobuffers(page); | |
1da177e4 | 811 | |
48186c7d | 812 | dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n", |
1da177e4 | 813 | status, (long long)i_size_read(inode)); |
1da177e4 LT |
814 | return status; |
815 | } | |
816 | ||
a861a1e1 FI |
817 | static void nfs_writepage_release(struct nfs_page *req, |
818 | struct nfs_write_data *data) | |
1da177e4 | 819 | { |
a6305ddb | 820 | struct page *page = req->wb_page; |
1da177e4 | 821 | |
a861a1e1 | 822 | if (PageError(req->wb_page) || !nfs_reschedule_unstable_write(req, data)) |
8e821cad | 823 | nfs_inode_remove_request(req); |
9994b62b | 824 | nfs_unlock_request(req); |
a6305ddb | 825 | nfs_end_page_writeback(page); |
1da177e4 LT |
826 | } |
827 | ||
3ff7576d | 828 | static int flush_task_priority(int how) |
1da177e4 LT |
829 | { |
830 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
831 | case FLUSH_HIGHPRI: | |
832 | return RPC_PRIORITY_HIGH; | |
833 | case FLUSH_LOWPRI: | |
834 | return RPC_PRIORITY_LOW; | |
835 | } | |
836 | return RPC_PRIORITY_NORMAL; | |
837 | } | |
838 | ||
a69aef14 | 839 | int nfs_initiate_write(struct nfs_write_data *data, |
d138d5d1 AA |
840 | struct rpc_clnt *clnt, |
841 | const struct rpc_call_ops *call_ops, | |
842 | int how) | |
1da177e4 | 843 | { |
d138d5d1 | 844 | struct inode *inode = data->inode; |
3ff7576d | 845 | int priority = flush_task_priority(how); |
07737691 | 846 | struct rpc_task *task; |
bdc7f021 TM |
847 | struct rpc_message msg = { |
848 | .rpc_argp = &data->args, | |
849 | .rpc_resp = &data->res, | |
d138d5d1 | 850 | .rpc_cred = data->cred, |
bdc7f021 | 851 | }; |
84115e1c | 852 | struct rpc_task_setup task_setup_data = { |
d138d5d1 | 853 | .rpc_client = clnt, |
07737691 | 854 | .task = &data->task, |
bdc7f021 | 855 | .rpc_message = &msg, |
84115e1c TM |
856 | .callback_ops = call_ops, |
857 | .callback_data = data, | |
101070ca | 858 | .workqueue = nfsiod_workqueue, |
2c61be0a | 859 | .flags = RPC_TASK_ASYNC, |
3ff7576d | 860 | .priority = priority, |
84115e1c | 861 | }; |
2c61be0a | 862 | int ret = 0; |
1da177e4 | 863 | |
d138d5d1 AA |
864 | /* Set up the initial task struct. */ |
865 | NFS_PROTO(inode)->write_setup(data, &msg); | |
866 | ||
867 | dprintk("NFS: %5u initiated write call " | |
868 | "(req %s/%lld, %u bytes @ offset %llu)\n", | |
869 | data->task.tk_pid, | |
870 | inode->i_sb->s_id, | |
871 | (long long)NFS_FILEID(inode), | |
872 | data->args.count, | |
873 | (unsigned long long)data->args.offset); | |
874 | ||
875 | task = rpc_run_task(&task_setup_data); | |
876 | if (IS_ERR(task)) { | |
877 | ret = PTR_ERR(task); | |
878 | goto out; | |
879 | } | |
880 | if (how & FLUSH_SYNC) { | |
881 | ret = rpc_wait_for_completion_task(task); | |
882 | if (ret == 0) | |
883 | ret = task->tk_status; | |
884 | } | |
885 | rpc_put_task(task); | |
886 | out: | |
887 | return ret; | |
888 | } | |
a69aef14 | 889 | EXPORT_SYMBOL_GPL(nfs_initiate_write); |
d138d5d1 AA |
890 | |
891 | /* | |
892 | * Set up the argument/result storage required for the RPC call. | |
893 | */ | |
6e4efd56 | 894 | static void nfs_write_rpcsetup(struct nfs_page *req, |
d138d5d1 | 895 | struct nfs_write_data *data, |
d138d5d1 AA |
896 | unsigned int count, unsigned int offset, |
897 | int how) | |
898 | { | |
3d4ff43d | 899 | struct inode *inode = req->wb_context->dentry->d_inode; |
d138d5d1 | 900 | |
1da177e4 LT |
901 | /* Set up the RPC argument and reply structs |
902 | * NB: take care not to mess about with data->commit et al. */ | |
903 | ||
904 | data->req = req; | |
3d4ff43d | 905 | data->inode = inode = req->wb_context->dentry->d_inode; |
d138d5d1 | 906 | data->cred = req->wb_context->cred; |
1da177e4 LT |
907 | |
908 | data->args.fh = NFS_FH(inode); | |
909 | data->args.offset = req_offset(req) + offset; | |
2bea038c BH |
910 | /* pnfs_set_layoutcommit needs this */ |
911 | data->mds_offset = data->args.offset; | |
1da177e4 LT |
912 | data->args.pgbase = req->wb_pgbase + offset; |
913 | data->args.pages = data->pagevec; | |
914 | data->args.count = count; | |
383ba719 | 915 | data->args.context = get_nfs_open_context(req->wb_context); |
f11ac8db | 916 | data->args.lock_context = req->wb_lock_context; |
bdc7f021 | 917 | data->args.stable = NFS_UNSTABLE; |
87ed5eb4 TM |
918 | switch (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) { |
919 | case 0: | |
920 | break; | |
921 | case FLUSH_COND_STABLE: | |
922 | if (nfs_need_commit(NFS_I(inode))) | |
923 | break; | |
924 | default: | |
925 | data->args.stable = NFS_FILE_SYNC; | |
bdc7f021 | 926 | } |
1da177e4 LT |
927 | |
928 | data->res.fattr = &data->fattr; | |
929 | data->res.count = count; | |
930 | data->res.verf = &data->verf; | |
0e574af1 | 931 | nfs_fattr_init(&data->fattr); |
6e4efd56 | 932 | } |
1da177e4 | 933 | |
6e4efd56 TM |
934 | static int nfs_do_write(struct nfs_write_data *data, |
935 | const struct rpc_call_ops *call_ops, | |
6e4efd56 TM |
936 | int how) |
937 | { | |
5f00bcb3 | 938 | struct inode *inode = data->args.context->dentry->d_inode; |
0382b744 | 939 | |
d138d5d1 | 940 | return nfs_initiate_write(data, NFS_CLIENT(inode), call_ops, how); |
1da177e4 LT |
941 | } |
942 | ||
275acaaf TM |
943 | static int nfs_do_multiple_writes(struct list_head *head, |
944 | const struct rpc_call_ops *call_ops, | |
275acaaf TM |
945 | int how) |
946 | { | |
947 | struct nfs_write_data *data; | |
948 | int ret = 0; | |
949 | ||
950 | while (!list_empty(head)) { | |
951 | int ret2; | |
952 | ||
953 | data = list_entry(head->next, struct nfs_write_data, list); | |
954 | list_del_init(&data->list); | |
955 | ||
dce81290 | 956 | ret2 = nfs_do_write(data, call_ops, how); |
275acaaf TM |
957 | if (ret == 0) |
958 | ret = ret2; | |
959 | } | |
960 | return ret; | |
961 | } | |
962 | ||
6d884e8f F |
963 | /* If a nfs_flush_* function fails, it should remove reqs from @head and |
964 | * call this on each, which will prepare them to be retried on next | |
965 | * writeback using standard nfs. | |
966 | */ | |
967 | static void nfs_redirty_request(struct nfs_page *req) | |
968 | { | |
a6305ddb TM |
969 | struct page *page = req->wb_page; |
970 | ||
6d884e8f | 971 | nfs_mark_request_dirty(req); |
9994b62b | 972 | nfs_unlock_request(req); |
a6305ddb | 973 | nfs_end_page_writeback(page); |
6d884e8f F |
974 | } |
975 | ||
1da177e4 LT |
976 | /* |
977 | * Generate multiple small requests to write out a single | |
978 | * contiguous dirty area on one page. | |
979 | */ | |
275acaaf | 980 | static int nfs_flush_multi(struct nfs_pageio_descriptor *desc, struct list_head *res) |
1da177e4 | 981 | { |
c76069bd | 982 | struct nfs_page *req = nfs_list_entry(desc->pg_list.next); |
1da177e4 LT |
983 | struct page *page = req->wb_page; |
984 | struct nfs_write_data *data; | |
d097971d | 985 | size_t wsize = desc->pg_bsize, nbytes; |
e9f7bee1 | 986 | unsigned int offset; |
1da177e4 | 987 | int requests = 0; |
dbae4c73 | 988 | int ret = 0; |
1da177e4 LT |
989 | |
990 | nfs_list_remove_request(req); | |
991 | ||
b31268ac TM |
992 | if ((desc->pg_ioflags & FLUSH_COND_STABLE) && |
993 | (desc->pg_moreio || NFS_I(desc->pg_inode)->ncommit || | |
994 | desc->pg_count > wsize)) | |
995 | desc->pg_ioflags &= ~FLUSH_COND_STABLE; | |
996 | ||
997 | ||
275acaaf | 998 | offset = 0; |
c76069bd | 999 | nbytes = desc->pg_count; |
e9f7bee1 TM |
1000 | do { |
1001 | size_t len = min(nbytes, wsize); | |
1002 | ||
8d5658c9 | 1003 | data = nfs_writedata_alloc(1); |
1da177e4 LT |
1004 | if (!data) |
1005 | goto out_bad; | |
275acaaf | 1006 | data->pagevec[0] = page; |
f13c3620 | 1007 | nfs_write_rpcsetup(req, data, len, offset, desc->pg_ioflags); |
275acaaf | 1008 | list_add(&data->list, res); |
1da177e4 | 1009 | requests++; |
e9f7bee1 | 1010 | nbytes -= len; |
275acaaf | 1011 | offset += len; |
e9f7bee1 | 1012 | } while (nbytes != 0); |
1da177e4 | 1013 | atomic_set(&req->wb_complete, requests); |
50828d7e | 1014 | desc->pg_rpc_callops = &nfs_write_partial_ops; |
dbae4c73 | 1015 | return ret; |
1da177e4 LT |
1016 | |
1017 | out_bad: | |
275acaaf TM |
1018 | while (!list_empty(res)) { |
1019 | data = list_entry(res->next, struct nfs_write_data, list); | |
6e4efd56 | 1020 | list_del(&data->list); |
0da2a4ac | 1021 | nfs_writedata_free(data); |
1da177e4 | 1022 | } |
61822ab5 | 1023 | nfs_redirty_request(req); |
1da177e4 LT |
1024 | return -ENOMEM; |
1025 | } | |
1026 | ||
1027 | /* | |
1028 | * Create an RPC task for the given write request and kick it. | |
1029 | * The page must have been locked by the caller. | |
1030 | * | |
1031 | * It may happen that the page we're passed is not marked dirty. | |
1032 | * This is the case if nfs_updatepage detects a conflicting request | |
1033 | * that has been written but not committed. | |
1034 | */ | |
275acaaf | 1035 | static int nfs_flush_one(struct nfs_pageio_descriptor *desc, struct list_head *res) |
1da177e4 LT |
1036 | { |
1037 | struct nfs_page *req; | |
1038 | struct page **pages; | |
1039 | struct nfs_write_data *data; | |
c76069bd | 1040 | struct list_head *head = &desc->pg_list; |
3b609184 | 1041 | int ret = 0; |
1da177e4 | 1042 | |
c76069bd FI |
1043 | data = nfs_writedata_alloc(nfs_page_array_len(desc->pg_base, |
1044 | desc->pg_count)); | |
44b83799 FI |
1045 | if (!data) { |
1046 | while (!list_empty(head)) { | |
1047 | req = nfs_list_entry(head->next); | |
1048 | nfs_list_remove_request(req); | |
1049 | nfs_redirty_request(req); | |
1050 | } | |
1051 | ret = -ENOMEM; | |
1052 | goto out; | |
1053 | } | |
1da177e4 | 1054 | pages = data->pagevec; |
1da177e4 LT |
1055 | while (!list_empty(head)) { |
1056 | req = nfs_list_entry(head->next); | |
1057 | nfs_list_remove_request(req); | |
1058 | nfs_list_add_request(req, &data->pages); | |
1da177e4 | 1059 | *pages++ = req->wb_page; |
1da177e4 LT |
1060 | } |
1061 | req = nfs_list_entry(data->pages.next); | |
1062 | ||
b31268ac TM |
1063 | if ((desc->pg_ioflags & FLUSH_COND_STABLE) && |
1064 | (desc->pg_moreio || NFS_I(desc->pg_inode)->ncommit)) | |
1065 | desc->pg_ioflags &= ~FLUSH_COND_STABLE; | |
1066 | ||
1da177e4 | 1067 | /* Set up the argument struct */ |
6e4efd56 | 1068 | nfs_write_rpcsetup(req, data, desc->pg_count, 0, desc->pg_ioflags); |
275acaaf | 1069 | list_add(&data->list, res); |
50828d7e | 1070 | desc->pg_rpc_callops = &nfs_write_full_ops; |
44b83799 | 1071 | out: |
44b83799 | 1072 | return ret; |
1da177e4 LT |
1073 | } |
1074 | ||
dce81290 TM |
1075 | int nfs_generic_flush(struct nfs_pageio_descriptor *desc, struct list_head *head) |
1076 | { | |
1077 | if (desc->pg_bsize < PAGE_CACHE_SIZE) | |
1078 | return nfs_flush_multi(desc, head); | |
1079 | return nfs_flush_one(desc, head); | |
1080 | } | |
1081 | ||
1082 | static int nfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc) | |
1751c363 | 1083 | { |
275acaaf TM |
1084 | LIST_HEAD(head); |
1085 | int ret; | |
1086 | ||
dce81290 | 1087 | ret = nfs_generic_flush(desc, &head); |
50828d7e TM |
1088 | if (ret == 0) |
1089 | ret = nfs_do_multiple_writes(&head, desc->pg_rpc_callops, | |
dce81290 | 1090 | desc->pg_ioflags); |
275acaaf | 1091 | return ret; |
1751c363 | 1092 | } |
1751c363 TM |
1093 | |
1094 | static const struct nfs_pageio_ops nfs_pageio_write_ops = { | |
1095 | .pg_test = nfs_generic_pg_test, | |
1096 | .pg_doio = nfs_generic_pg_writepages, | |
1097 | }; | |
1098 | ||
e2fecb21 | 1099 | void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio, |
c63c7b05 | 1100 | struct inode *inode, int ioflags) |
1da177e4 | 1101 | { |
1751c363 TM |
1102 | nfs_pageio_init(pgio, inode, &nfs_pageio_write_ops, |
1103 | NFS_SERVER(inode)->wsize, ioflags); | |
1104 | } | |
1da177e4 | 1105 | |
dce81290 TM |
1106 | void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio) |
1107 | { | |
1108 | pgio->pg_ops = &nfs_pageio_write_ops; | |
1109 | pgio->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize; | |
1110 | } | |
1f945357 | 1111 | EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds); |
dce81290 | 1112 | |
1751c363 TM |
1113 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, |
1114 | struct inode *inode, int ioflags) | |
1115 | { | |
1116 | if (!pnfs_pageio_init_write(pgio, inode, ioflags)) | |
1117 | nfs_pageio_init_write_mds(pgio, inode, ioflags); | |
1da177e4 LT |
1118 | } |
1119 | ||
1120 | /* | |
1121 | * Handle a write reply that flushed part of a page. | |
1122 | */ | |
788e7a89 | 1123 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 1124 | { |
788e7a89 | 1125 | struct nfs_write_data *data = calldata; |
1da177e4 | 1126 | |
48186c7d CL |
1127 | dprintk("NFS: %5u write(%s/%lld %d@%lld)", |
1128 | task->tk_pid, | |
3d4ff43d | 1129 | data->req->wb_context->dentry->d_inode->i_sb->s_id, |
48186c7d | 1130 | (long long) |
3d4ff43d | 1131 | NFS_FILEID(data->req->wb_context->dentry->d_inode), |
48186c7d | 1132 | data->req->wb_bytes, (long long)req_offset(data->req)); |
1da177e4 | 1133 | |
c9d8f89d TM |
1134 | nfs_writeback_done(task, data); |
1135 | } | |
788e7a89 | 1136 | |
c9d8f89d TM |
1137 | static void nfs_writeback_release_partial(void *calldata) |
1138 | { | |
1139 | struct nfs_write_data *data = calldata; | |
1140 | struct nfs_page *req = data->req; | |
1141 | struct page *page = req->wb_page; | |
1142 | int status = data->task.tk_status; | |
1143 | ||
1144 | if (status < 0) { | |
a301b777 | 1145 | nfs_set_pageerror(page); |
c9d8f89d TM |
1146 | nfs_context_set_write_error(req->wb_context, status); |
1147 | dprintk(", error = %d\n", status); | |
8e821cad | 1148 | goto out; |
1da177e4 LT |
1149 | } |
1150 | ||
8e821cad | 1151 | if (nfs_write_need_commit(data)) { |
587142f8 | 1152 | struct inode *inode = page->mapping->host; |
8e821cad | 1153 | |
587142f8 | 1154 | spin_lock(&inode->i_lock); |
8e821cad TM |
1155 | if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { |
1156 | /* Do nothing we need to resend the writes */ | |
1157 | } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
1158 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1159 | dprintk(" defer commit\n"); | |
1160 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
1161 | set_bit(PG_NEED_RESCHED, &req->wb_flags); | |
1162 | clear_bit(PG_NEED_COMMIT, &req->wb_flags); | |
1163 | dprintk(" server reboot detected\n"); | |
1164 | } | |
587142f8 | 1165 | spin_unlock(&inode->i_lock); |
8e821cad TM |
1166 | } else |
1167 | dprintk(" OK\n"); | |
1168 | ||
1169 | out: | |
1da177e4 | 1170 | if (atomic_dec_and_test(&req->wb_complete)) |
a861a1e1 | 1171 | nfs_writepage_release(req, data); |
c9d8f89d | 1172 | nfs_writedata_release(calldata); |
1da177e4 LT |
1173 | } |
1174 | ||
def6ed7e AA |
1175 | void nfs_write_prepare(struct rpc_task *task, void *calldata) |
1176 | { | |
1177 | struct nfs_write_data *data = calldata; | |
c6cb80d0 | 1178 | NFS_PROTO(data->inode)->write_rpc_prepare(task, data); |
def6ed7e | 1179 | } |
def6ed7e | 1180 | |
788e7a89 | 1181 | static const struct rpc_call_ops nfs_write_partial_ops = { |
def6ed7e | 1182 | .rpc_call_prepare = nfs_write_prepare, |
788e7a89 | 1183 | .rpc_call_done = nfs_writeback_done_partial, |
c9d8f89d | 1184 | .rpc_release = nfs_writeback_release_partial, |
788e7a89 TM |
1185 | }; |
1186 | ||
1da177e4 LT |
1187 | /* |
1188 | * Handle a write reply that flushes a whole page. | |
1189 | * | |
1190 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
1191 | * writebacks since the page->count is kept > 1 for as long | |
1192 | * as the page has a write request pending. | |
1193 | */ | |
788e7a89 | 1194 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 1195 | { |
788e7a89 | 1196 | struct nfs_write_data *data = calldata; |
1da177e4 | 1197 | |
c9d8f89d TM |
1198 | nfs_writeback_done(task, data); |
1199 | } | |
1200 | ||
1201 | static void nfs_writeback_release_full(void *calldata) | |
1202 | { | |
1203 | struct nfs_write_data *data = calldata; | |
e2fecb21 | 1204 | int status = data->task.tk_status; |
788e7a89 | 1205 | |
1da177e4 LT |
1206 | /* Update attributes as result of writeback. */ |
1207 | while (!list_empty(&data->pages)) { | |
c9d8f89d TM |
1208 | struct nfs_page *req = nfs_list_entry(data->pages.next); |
1209 | struct page *page = req->wb_page; | |
1210 | ||
1da177e4 | 1211 | nfs_list_remove_request(req); |
1da177e4 | 1212 | |
48186c7d CL |
1213 | dprintk("NFS: %5u write (%s/%lld %d@%lld)", |
1214 | data->task.tk_pid, | |
3d4ff43d AV |
1215 | req->wb_context->dentry->d_inode->i_sb->s_id, |
1216 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1da177e4 LT |
1217 | req->wb_bytes, |
1218 | (long long)req_offset(req)); | |
1219 | ||
c9d8f89d | 1220 | if (status < 0) { |
a301b777 | 1221 | nfs_set_pageerror(page); |
c9d8f89d TM |
1222 | nfs_context_set_write_error(req->wb_context, status); |
1223 | dprintk(", error = %d\n", status); | |
8e821cad | 1224 | goto remove_request; |
1da177e4 | 1225 | } |
1da177e4 | 1226 | |
8e821cad TM |
1227 | if (nfs_write_need_commit(data)) { |
1228 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
a861a1e1 | 1229 | nfs_mark_request_commit(req, data->lseg); |
8e821cad | 1230 | dprintk(" marked for commit\n"); |
1da177e4 LT |
1231 | goto next; |
1232 | } | |
8e821cad TM |
1233 | dprintk(" OK\n"); |
1234 | remove_request: | |
1da177e4 | 1235 | nfs_inode_remove_request(req); |
1da177e4 | 1236 | next: |
9994b62b | 1237 | nfs_unlock_request(req); |
a6305ddb | 1238 | nfs_end_page_writeback(page); |
1da177e4 | 1239 | } |
c9d8f89d | 1240 | nfs_writedata_release(calldata); |
1da177e4 LT |
1241 | } |
1242 | ||
788e7a89 | 1243 | static const struct rpc_call_ops nfs_write_full_ops = { |
def6ed7e | 1244 | .rpc_call_prepare = nfs_write_prepare, |
788e7a89 | 1245 | .rpc_call_done = nfs_writeback_done_full, |
c9d8f89d | 1246 | .rpc_release = nfs_writeback_release_full, |
788e7a89 TM |
1247 | }; |
1248 | ||
1249 | ||
1da177e4 LT |
1250 | /* |
1251 | * This function is called when the WRITE call is complete. | |
1252 | */ | |
13602896 | 1253 | void nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1254 | { |
1da177e4 LT |
1255 | struct nfs_writeargs *argp = &data->args; |
1256 | struct nfs_writeres *resp = &data->res; | |
788e7a89 | 1257 | int status; |
1da177e4 | 1258 | |
a3f565b1 | 1259 | dprintk("NFS: %5u nfs_writeback_done (status %d)\n", |
1da177e4 LT |
1260 | task->tk_pid, task->tk_status); |
1261 | ||
f551e44f CL |
1262 | /* |
1263 | * ->write_done will attempt to use post-op attributes to detect | |
1264 | * conflicting writes by other clients. A strict interpretation | |
1265 | * of close-to-open would allow us to continue caching even if | |
1266 | * another writer had changed the file, but some applications | |
1267 | * depend on tighter cache coherency when writing. | |
1268 | */ | |
788e7a89 TM |
1269 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1270 | if (status != 0) | |
13602896 | 1271 | return; |
91d5b470 CL |
1272 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1273 | ||
1da177e4 LT |
1274 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1275 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1276 | /* We tried a write call, but the server did not | |
1277 | * commit data to stable storage even though we | |
1278 | * requested it. | |
1279 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1280 | * the server reports NFS_DATA_SYNC, but performs | |
1281 | * NFS_FILE_SYNC. We therefore implement this checking | |
1282 | * as a dprintk() in order to avoid filling syslog. | |
1283 | */ | |
1284 | static unsigned long complain; | |
1285 | ||
a69aef14 | 1286 | /* Note this will print the MDS for a DS write */ |
1da177e4 | 1287 | if (time_before(complain, jiffies)) { |
48186c7d | 1288 | dprintk("NFS: faulty NFS server %s:" |
1da177e4 | 1289 | " (committed = %d) != (stable = %d)\n", |
2b72c9cc | 1290 | NFS_SERVER(data->inode)->nfs_client->cl_hostname, |
1da177e4 LT |
1291 | resp->verf->committed, argp->stable); |
1292 | complain = jiffies + 300 * HZ; | |
1293 | } | |
1294 | } | |
1295 | #endif | |
1296 | /* Is this a short write? */ | |
1297 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1298 | static unsigned long complain; | |
1299 | ||
91d5b470 CL |
1300 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1301 | ||
1da177e4 LT |
1302 | /* Has the server at least made some progress? */ |
1303 | if (resp->count != 0) { | |
1304 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1305 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1306 | /* Resend from where the server left off */ | |
a69aef14 | 1307 | data->mds_offset += resp->count; |
1da177e4 LT |
1308 | argp->offset += resp->count; |
1309 | argp->pgbase += resp->count; | |
1310 | argp->count -= resp->count; | |
1311 | } else { | |
1312 | /* Resend as a stable write in order to avoid | |
1313 | * headaches in the case of a server crash. | |
1314 | */ | |
1315 | argp->stable = NFS_FILE_SYNC; | |
1316 | } | |
d00c5d43 | 1317 | rpc_restart_call_prepare(task); |
13602896 | 1318 | return; |
1da177e4 LT |
1319 | } |
1320 | if (time_before(complain, jiffies)) { | |
1321 | printk(KERN_WARNING | |
1322 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1323 | argp->count); | |
1324 | complain = jiffies + 300 * HZ; | |
1325 | } | |
1326 | /* Can't do anything about it except throw an error. */ | |
1327 | task->tk_status = -EIO; | |
1328 | } | |
13602896 | 1329 | return; |
1da177e4 LT |
1330 | } |
1331 | ||
1332 | ||
1333 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
71d0a611 TM |
1334 | static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait) |
1335 | { | |
b8413f98 TM |
1336 | int ret; |
1337 | ||
71d0a611 TM |
1338 | if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags)) |
1339 | return 1; | |
b8413f98 TM |
1340 | if (!may_wait) |
1341 | return 0; | |
1342 | ret = out_of_line_wait_on_bit_lock(&nfsi->flags, | |
1343 | NFS_INO_COMMIT, | |
1344 | nfs_wait_bit_killable, | |
1345 | TASK_KILLABLE); | |
1346 | return (ret < 0) ? ret : 1; | |
71d0a611 TM |
1347 | } |
1348 | ||
e0c2b380 | 1349 | void nfs_commit_clear_lock(struct nfs_inode *nfsi) |
71d0a611 TM |
1350 | { |
1351 | clear_bit(NFS_INO_COMMIT, &nfsi->flags); | |
1352 | smp_mb__after_clear_bit(); | |
1353 | wake_up_bit(&nfsi->flags, NFS_INO_COMMIT); | |
1354 | } | |
e0c2b380 | 1355 | EXPORT_SYMBOL_GPL(nfs_commit_clear_lock); |
71d0a611 | 1356 | |
e0c2b380 | 1357 | void nfs_commitdata_release(void *data) |
1da177e4 | 1358 | { |
383ba719 TM |
1359 | struct nfs_write_data *wdata = data; |
1360 | ||
1361 | put_nfs_open_context(wdata->args.context); | |
1da177e4 LT |
1362 | nfs_commit_free(wdata); |
1363 | } | |
e0c2b380 | 1364 | EXPORT_SYMBOL_GPL(nfs_commitdata_release); |
1da177e4 | 1365 | |
e0c2b380 | 1366 | int nfs_initiate_commit(struct nfs_write_data *data, struct rpc_clnt *clnt, |
9ace33cd FI |
1367 | const struct rpc_call_ops *call_ops, |
1368 | int how) | |
1da177e4 | 1369 | { |
07737691 | 1370 | struct rpc_task *task; |
9ace33cd | 1371 | int priority = flush_task_priority(how); |
bdc7f021 TM |
1372 | struct rpc_message msg = { |
1373 | .rpc_argp = &data->args, | |
1374 | .rpc_resp = &data->res, | |
9ace33cd | 1375 | .rpc_cred = data->cred, |
bdc7f021 | 1376 | }; |
84115e1c | 1377 | struct rpc_task_setup task_setup_data = { |
07737691 | 1378 | .task = &data->task, |
9ace33cd | 1379 | .rpc_client = clnt, |
bdc7f021 | 1380 | .rpc_message = &msg, |
9ace33cd | 1381 | .callback_ops = call_ops, |
84115e1c | 1382 | .callback_data = data, |
101070ca | 1383 | .workqueue = nfsiod_workqueue, |
2c61be0a | 1384 | .flags = RPC_TASK_ASYNC, |
3ff7576d | 1385 | .priority = priority, |
84115e1c | 1386 | }; |
9ace33cd FI |
1387 | /* Set up the initial task struct. */ |
1388 | NFS_PROTO(data->inode)->commit_setup(data, &msg); | |
1389 | ||
1390 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); | |
1391 | ||
1392 | task = rpc_run_task(&task_setup_data); | |
1393 | if (IS_ERR(task)) | |
1394 | return PTR_ERR(task); | |
1395 | if (how & FLUSH_SYNC) | |
1396 | rpc_wait_for_completion_task(task); | |
1397 | rpc_put_task(task); | |
1398 | return 0; | |
1399 | } | |
e0c2b380 | 1400 | EXPORT_SYMBOL_GPL(nfs_initiate_commit); |
9ace33cd FI |
1401 | |
1402 | /* | |
1403 | * Set up the argument/result storage required for the RPC call. | |
1404 | */ | |
e0c2b380 | 1405 | void nfs_init_commit(struct nfs_write_data *data, |
988b6dce FI |
1406 | struct list_head *head, |
1407 | struct pnfs_layout_segment *lseg) | |
9ace33cd FI |
1408 | { |
1409 | struct nfs_page *first = nfs_list_entry(head->next); | |
3d4ff43d | 1410 | struct inode *inode = first->wb_context->dentry->d_inode; |
1da177e4 LT |
1411 | |
1412 | /* Set up the RPC argument and reply structs | |
1413 | * NB: take care not to mess about with data->commit et al. */ | |
1414 | ||
1415 | list_splice_init(head, &data->pages); | |
1da177e4 | 1416 | |
1da177e4 | 1417 | data->inode = inode; |
9ace33cd | 1418 | data->cred = first->wb_context->cred; |
988b6dce | 1419 | data->lseg = lseg; /* reference transferred */ |
9ace33cd | 1420 | data->mds_ops = &nfs_commit_ops; |
1da177e4 LT |
1421 | |
1422 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1423 | /* Note: we always request a commit of the entire inode */ |
1424 | data->args.offset = 0; | |
1425 | data->args.count = 0; | |
383ba719 | 1426 | data->args.context = get_nfs_open_context(first->wb_context); |
3da28eb1 | 1427 | data->res.count = 0; |
1da177e4 LT |
1428 | data->res.fattr = &data->fattr; |
1429 | data->res.verf = &data->verf; | |
0e574af1 | 1430 | nfs_fattr_init(&data->fattr); |
1da177e4 | 1431 | } |
e0c2b380 | 1432 | EXPORT_SYMBOL_GPL(nfs_init_commit); |
1da177e4 | 1433 | |
e0c2b380 | 1434 | void nfs_retry_commit(struct list_head *page_list, |
a861a1e1 | 1435 | struct pnfs_layout_segment *lseg) |
64bfeb49 FI |
1436 | { |
1437 | struct nfs_page *req; | |
1438 | ||
1439 | while (!list_empty(page_list)) { | |
1440 | req = nfs_list_entry(page_list->next); | |
1441 | nfs_list_remove_request(req); | |
a861a1e1 | 1442 | nfs_mark_request_commit(req, lseg); |
64bfeb49 FI |
1443 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
1444 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, | |
1445 | BDI_RECLAIMABLE); | |
9994b62b | 1446 | nfs_unlock_request(req); |
64bfeb49 FI |
1447 | } |
1448 | } | |
e0c2b380 | 1449 | EXPORT_SYMBOL_GPL(nfs_retry_commit); |
64bfeb49 | 1450 | |
1da177e4 LT |
1451 | /* |
1452 | * Commit dirty pages | |
1453 | */ | |
1454 | static int | |
40859d7e | 1455 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1456 | { |
1457 | struct nfs_write_data *data; | |
1da177e4 | 1458 | |
c9d8f89d | 1459 | data = nfs_commitdata_alloc(); |
1da177e4 LT |
1460 | |
1461 | if (!data) | |
1462 | goto out_bad; | |
1463 | ||
1464 | /* Set up the argument struct */ | |
988b6dce | 1465 | nfs_init_commit(data, head, NULL); |
9ace33cd | 1466 | return nfs_initiate_commit(data, NFS_CLIENT(inode), data->mds_ops, how); |
1da177e4 | 1467 | out_bad: |
a861a1e1 | 1468 | nfs_retry_commit(head, NULL); |
71d0a611 | 1469 | nfs_commit_clear_lock(NFS_I(inode)); |
1da177e4 LT |
1470 | return -ENOMEM; |
1471 | } | |
1472 | ||
1473 | /* | |
1474 | * COMMIT call returned | |
1475 | */ | |
788e7a89 | 1476 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1477 | { |
963d8fe5 | 1478 | struct nfs_write_data *data = calldata; |
1da177e4 | 1479 | |
a3f565b1 | 1480 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
1da177e4 LT |
1481 | task->tk_pid, task->tk_status); |
1482 | ||
788e7a89 | 1483 | /* Call the NFS version-specific code */ |
c0d0e96b | 1484 | NFS_PROTO(data->inode)->commit_done(task, data); |
c9d8f89d TM |
1485 | } |
1486 | ||
e0c2b380 | 1487 | void nfs_commit_release_pages(struct nfs_write_data *data) |
c9d8f89d | 1488 | { |
5917ce84 | 1489 | struct nfs_page *req; |
c9d8f89d | 1490 | int status = data->task.tk_status; |
788e7a89 | 1491 | |
1da177e4 LT |
1492 | while (!list_empty(&data->pages)) { |
1493 | req = nfs_list_entry(data->pages.next); | |
1494 | nfs_list_remove_request(req); | |
d6d6dc7c | 1495 | nfs_clear_page_commit(req->wb_page); |
1da177e4 | 1496 | |
48186c7d | 1497 | dprintk("NFS: commit (%s/%lld %d@%lld)", |
3d4ff43d AV |
1498 | req->wb_context->dentry->d_sb->s_id, |
1499 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1da177e4 LT |
1500 | req->wb_bytes, |
1501 | (long long)req_offset(req)); | |
c9d8f89d TM |
1502 | if (status < 0) { |
1503 | nfs_context_set_write_error(req->wb_context, status); | |
1da177e4 | 1504 | nfs_inode_remove_request(req); |
c9d8f89d | 1505 | dprintk(", error = %d\n", status); |
1da177e4 LT |
1506 | goto next; |
1507 | } | |
1508 | ||
1509 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1510 | * returned by the server against all stored verfs. */ | |
1511 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1512 | /* We have a match */ | |
1513 | nfs_inode_remove_request(req); | |
1514 | dprintk(" OK\n"); | |
1515 | goto next; | |
1516 | } | |
1517 | /* We have a mismatch. Write the page again */ | |
1518 | dprintk(" mismatch\n"); | |
6d884e8f | 1519 | nfs_mark_request_dirty(req); |
1da177e4 | 1520 | next: |
9994b62b | 1521 | nfs_unlock_request(req); |
1da177e4 | 1522 | } |
5917ce84 | 1523 | } |
e0c2b380 | 1524 | EXPORT_SYMBOL_GPL(nfs_commit_release_pages); |
5917ce84 FI |
1525 | |
1526 | static void nfs_commit_release(void *calldata) | |
1527 | { | |
1528 | struct nfs_write_data *data = calldata; | |
1529 | ||
1530 | nfs_commit_release_pages(data); | |
71d0a611 | 1531 | nfs_commit_clear_lock(NFS_I(data->inode)); |
c9d8f89d | 1532 | nfs_commitdata_release(calldata); |
1da177e4 | 1533 | } |
788e7a89 TM |
1534 | |
1535 | static const struct rpc_call_ops nfs_commit_ops = { | |
21d9a851 | 1536 | .rpc_call_prepare = nfs_write_prepare, |
788e7a89 TM |
1537 | .rpc_call_done = nfs_commit_done, |
1538 | .rpc_release = nfs_commit_release, | |
1539 | }; | |
1da177e4 | 1540 | |
b608b283 | 1541 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 | 1542 | { |
1da177e4 | 1543 | LIST_HEAD(head); |
71d0a611 | 1544 | int may_wait = how & FLUSH_SYNC; |
b8413f98 | 1545 | int res; |
1da177e4 | 1546 | |
b8413f98 TM |
1547 | res = nfs_commit_set_lock(NFS_I(inode), may_wait); |
1548 | if (res <= 0) | |
c5efa5fc | 1549 | goto out_mark_dirty; |
d6d6dc7c | 1550 | res = nfs_scan_commit(inode, &head); |
1da177e4 | 1551 | if (res) { |
a861a1e1 FI |
1552 | int error; |
1553 | ||
1554 | error = pnfs_commit_list(inode, &head, how); | |
1555 | if (error == PNFS_NOT_ATTEMPTED) | |
1556 | error = nfs_commit_list(inode, &head, how); | |
3da28eb1 TM |
1557 | if (error < 0) |
1558 | return error; | |
b8413f98 | 1559 | if (!may_wait) |
c5efa5fc | 1560 | goto out_mark_dirty; |
b8413f98 TM |
1561 | error = wait_on_bit(&NFS_I(inode)->flags, |
1562 | NFS_INO_COMMIT, | |
1563 | nfs_wait_bit_killable, | |
1564 | TASK_KILLABLE); | |
1565 | if (error < 0) | |
1566 | return error; | |
71d0a611 TM |
1567 | } else |
1568 | nfs_commit_clear_lock(NFS_I(inode)); | |
c5efa5fc TM |
1569 | return res; |
1570 | /* Note: If we exit without ensuring that the commit is complete, | |
1571 | * we must mark the inode as dirty. Otherwise, future calls to | |
1572 | * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure | |
1573 | * that the data is on the disk. | |
1574 | */ | |
1575 | out_mark_dirty: | |
1576 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); | |
1da177e4 LT |
1577 | return res; |
1578 | } | |
8fc795f7 TM |
1579 | |
1580 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) | |
1581 | { | |
420e3646 TM |
1582 | struct nfs_inode *nfsi = NFS_I(inode); |
1583 | int flags = FLUSH_SYNC; | |
1584 | int ret = 0; | |
8fc795f7 | 1585 | |
3236c3e1 JL |
1586 | /* no commits means nothing needs to be done */ |
1587 | if (!nfsi->ncommit) | |
1588 | return ret; | |
1589 | ||
a00dd6c0 JL |
1590 | if (wbc->sync_mode == WB_SYNC_NONE) { |
1591 | /* Don't commit yet if this is a non-blocking flush and there | |
1592 | * are a lot of outstanding writes for this mapping. | |
1593 | */ | |
1594 | if (nfsi->ncommit <= (nfsi->npages >> 1)) | |
1595 | goto out_mark_dirty; | |
420e3646 | 1596 | |
a00dd6c0 | 1597 | /* don't wait for the COMMIT response */ |
420e3646 | 1598 | flags = 0; |
a00dd6c0 JL |
1599 | } |
1600 | ||
420e3646 TM |
1601 | ret = nfs_commit_inode(inode, flags); |
1602 | if (ret >= 0) { | |
1603 | if (wbc->sync_mode == WB_SYNC_NONE) { | |
1604 | if (ret < wbc->nr_to_write) | |
1605 | wbc->nr_to_write -= ret; | |
1606 | else | |
1607 | wbc->nr_to_write = 0; | |
1608 | } | |
8fc795f7 | 1609 | return 0; |
420e3646 TM |
1610 | } |
1611 | out_mark_dirty: | |
8fc795f7 TM |
1612 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1613 | return ret; | |
1614 | } | |
c63c7b05 | 1615 | #else |
8fc795f7 TM |
1616 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) |
1617 | { | |
1618 | return 0; | |
1619 | } | |
1da177e4 LT |
1620 | #endif |
1621 | ||
8fc795f7 TM |
1622 | int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1623 | { | |
863a3c6c AA |
1624 | int ret; |
1625 | ||
1626 | ret = nfs_commit_unstable_pages(inode, wbc); | |
1627 | if (ret >= 0 && test_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(inode)->flags)) { | |
ef311537 AA |
1628 | int status; |
1629 | bool sync = true; | |
863a3c6c | 1630 | |
846d5a09 | 1631 | if (wbc->sync_mode == WB_SYNC_NONE) |
ef311537 | 1632 | sync = false; |
863a3c6c AA |
1633 | |
1634 | status = pnfs_layoutcommit_inode(inode, sync); | |
1635 | if (status < 0) | |
1636 | return status; | |
1637 | } | |
1638 | return ret; | |
8fc795f7 TM |
1639 | } |
1640 | ||
acdc53b2 TM |
1641 | /* |
1642 | * flush the inode to disk. | |
1643 | */ | |
1644 | int nfs_wb_all(struct inode *inode) | |
34901f70 TM |
1645 | { |
1646 | struct writeback_control wbc = { | |
72cb77f4 | 1647 | .sync_mode = WB_SYNC_ALL, |
34901f70 | 1648 | .nr_to_write = LONG_MAX, |
d7fb1207 TM |
1649 | .range_start = 0, |
1650 | .range_end = LLONG_MAX, | |
34901f70 | 1651 | }; |
34901f70 | 1652 | |
acdc53b2 | 1653 | return sync_inode(inode, &wbc); |
1c75950b TM |
1654 | } |
1655 | ||
1b3b4a1a TM |
1656 | int nfs_wb_page_cancel(struct inode *inode, struct page *page) |
1657 | { | |
1658 | struct nfs_page *req; | |
1b3b4a1a TM |
1659 | int ret = 0; |
1660 | ||
1661 | BUG_ON(!PageLocked(page)); | |
1662 | for (;;) { | |
ba8b06e6 | 1663 | wait_on_page_writeback(page); |
1b3b4a1a TM |
1664 | req = nfs_page_find_request(page); |
1665 | if (req == NULL) | |
1b3b4a1a | 1666 | break; |
1b3b4a1a | 1667 | if (nfs_lock_request_dontget(req)) { |
8dd37758 | 1668 | nfs_clear_request_commit(req); |
1b3b4a1a TM |
1669 | nfs_inode_remove_request(req); |
1670 | /* | |
1671 | * In case nfs_inode_remove_request has marked the | |
1672 | * page as being dirty | |
1673 | */ | |
1674 | cancel_dirty_page(page, PAGE_CACHE_SIZE); | |
1675 | nfs_unlock_request(req); | |
1676 | break; | |
1677 | } | |
1678 | ret = nfs_wait_on_request(req); | |
c9edda71 | 1679 | nfs_release_request(req); |
1b3b4a1a | 1680 | if (ret < 0) |
c988950e | 1681 | break; |
1b3b4a1a | 1682 | } |
1b3b4a1a TM |
1683 | return ret; |
1684 | } | |
1685 | ||
7f2f12d9 TM |
1686 | /* |
1687 | * Write back all requests on one page - we do this before reading it. | |
1688 | */ | |
1689 | int nfs_wb_page(struct inode *inode, struct page *page) | |
1c75950b TM |
1690 | { |
1691 | loff_t range_start = page_offset(page); | |
1692 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
4d770ccf | 1693 | struct writeback_control wbc = { |
4d770ccf | 1694 | .sync_mode = WB_SYNC_ALL, |
7f2f12d9 | 1695 | .nr_to_write = 0, |
4d770ccf TM |
1696 | .range_start = range_start, |
1697 | .range_end = range_end, | |
1698 | }; | |
1699 | int ret; | |
1c75950b | 1700 | |
0522f6ad | 1701 | for (;;) { |
ba8b06e6 | 1702 | wait_on_page_writeback(page); |
73e3302f TM |
1703 | if (clear_page_dirty_for_io(page)) { |
1704 | ret = nfs_writepage_locked(page, &wbc); | |
1705 | if (ret < 0) | |
1706 | goto out_error; | |
0522f6ad | 1707 | continue; |
7f2f12d9 | 1708 | } |
0522f6ad TM |
1709 | if (!PagePrivate(page)) |
1710 | break; | |
1711 | ret = nfs_commit_inode(inode, FLUSH_SYNC); | |
ba8b06e6 | 1712 | if (ret < 0) |
73e3302f | 1713 | goto out_error; |
7f2f12d9 | 1714 | } |
73e3302f TM |
1715 | return 0; |
1716 | out_error: | |
4d770ccf | 1717 | return ret; |
1c75950b TM |
1718 | } |
1719 | ||
074cc1de TM |
1720 | #ifdef CONFIG_MIGRATION |
1721 | int nfs_migrate_page(struct address_space *mapping, struct page *newpage, | |
a6bc32b8 | 1722 | struct page *page, enum migrate_mode mode) |
074cc1de | 1723 | { |
2da95652 JL |
1724 | /* |
1725 | * If PagePrivate is set, then the page is currently associated with | |
1726 | * an in-progress read or write request. Don't try to migrate it. | |
1727 | * | |
1728 | * FIXME: we could do this in principle, but we'll need a way to ensure | |
1729 | * that we can safely release the inode reference while holding | |
1730 | * the page lock. | |
1731 | */ | |
1732 | if (PagePrivate(page)) | |
1733 | return -EBUSY; | |
074cc1de | 1734 | |
7549ad5f | 1735 | nfs_fscache_release_page(page, GFP_KERNEL); |
074cc1de | 1736 | |
a6bc32b8 | 1737 | return migrate_page(mapping, newpage, page, mode); |
074cc1de TM |
1738 | } |
1739 | #endif | |
1740 | ||
f7b422b1 | 1741 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1742 | { |
1743 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1744 | sizeof(struct nfs_write_data), | |
1745 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1746 | NULL); |
1da177e4 LT |
1747 | if (nfs_wdata_cachep == NULL) |
1748 | return -ENOMEM; | |
1749 | ||
93d2341c MD |
1750 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1751 | nfs_wdata_cachep); | |
1da177e4 LT |
1752 | if (nfs_wdata_mempool == NULL) |
1753 | return -ENOMEM; | |
1754 | ||
93d2341c MD |
1755 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1756 | nfs_wdata_cachep); | |
1da177e4 LT |
1757 | if (nfs_commit_mempool == NULL) |
1758 | return -ENOMEM; | |
1759 | ||
89a09141 PZ |
1760 | /* |
1761 | * NFS congestion size, scale with available memory. | |
1762 | * | |
1763 | * 64MB: 8192k | |
1764 | * 128MB: 11585k | |
1765 | * 256MB: 16384k | |
1766 | * 512MB: 23170k | |
1767 | * 1GB: 32768k | |
1768 | * 2GB: 46340k | |
1769 | * 4GB: 65536k | |
1770 | * 8GB: 92681k | |
1771 | * 16GB: 131072k | |
1772 | * | |
1773 | * This allows larger machines to have larger/more transfers. | |
1774 | * Limit the default to 256M | |
1775 | */ | |
1776 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); | |
1777 | if (nfs_congestion_kb > 256*1024) | |
1778 | nfs_congestion_kb = 256*1024; | |
1779 | ||
1da177e4 LT |
1780 | return 0; |
1781 | } | |
1782 | ||
266bee88 | 1783 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1784 | { |
1785 | mempool_destroy(nfs_commit_mempool); | |
1786 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1787 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1788 | } |
1789 |