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> |
1da177e4 LT |
16 | |
17 | #include <linux/sunrpc/clnt.h> | |
18 | #include <linux/nfs_fs.h> | |
19 | #include <linux/nfs_mount.h> | |
20 | #include <linux/nfs_page.h> | |
3fcfab16 AM |
21 | #include <linux/backing-dev.h> |
22 | ||
1da177e4 | 23 | #include <asm/uaccess.h> |
1da177e4 LT |
24 | |
25 | #include "delegation.h" | |
49a70f27 | 26 | #include "internal.h" |
91d5b470 | 27 | #include "iostat.h" |
1da177e4 LT |
28 | |
29 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE | |
30 | ||
31 | #define MIN_POOL_WRITE (32) | |
32 | #define MIN_POOL_COMMIT (4) | |
33 | ||
34 | /* | |
35 | * Local function declarations | |
36 | */ | |
37 | static struct nfs_page * nfs_update_request(struct nfs_open_context*, | |
1da177e4 LT |
38 | struct page *, |
39 | unsigned int, unsigned int); | |
c63c7b05 TM |
40 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *desc, |
41 | struct inode *inode, int ioflags); | |
f8512ad0 | 42 | static void nfs_redirty_request(struct nfs_page *req); |
788e7a89 TM |
43 | static const struct rpc_call_ops nfs_write_partial_ops; |
44 | static const struct rpc_call_ops nfs_write_full_ops; | |
45 | static const struct rpc_call_ops nfs_commit_ops; | |
1da177e4 | 46 | |
e18b890b | 47 | static struct kmem_cache *nfs_wdata_cachep; |
3feb2d49 | 48 | static mempool_t *nfs_wdata_mempool; |
1da177e4 LT |
49 | static mempool_t *nfs_commit_mempool; |
50 | ||
c9d8f89d | 51 | struct nfs_write_data *nfs_commitdata_alloc(void) |
1da177e4 | 52 | { |
e6b4f8da | 53 | struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS); |
40859d7e | 54 | |
1da177e4 LT |
55 | if (p) { |
56 | memset(p, 0, sizeof(*p)); | |
57 | INIT_LIST_HEAD(&p->pages); | |
58 | } | |
59 | return p; | |
60 | } | |
61 | ||
5e4424af | 62 | void nfs_commit_free(struct nfs_write_data *p) |
1da177e4 | 63 | { |
40859d7e CL |
64 | if (p && (p->pagevec != &p->page_array[0])) |
65 | kfree(p->pagevec); | |
1da177e4 LT |
66 | mempool_free(p, nfs_commit_mempool); |
67 | } | |
68 | ||
8d5658c9 | 69 | struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount) |
3feb2d49 | 70 | { |
e6b4f8da | 71 | struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS); |
3feb2d49 TM |
72 | |
73 | if (p) { | |
74 | memset(p, 0, sizeof(*p)); | |
75 | INIT_LIST_HEAD(&p->pages); | |
e9f7bee1 | 76 | p->npages = pagecount; |
0d0b5cb3 CL |
77 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
78 | p->pagevec = p->page_array; | |
3feb2d49 | 79 | else { |
0d0b5cb3 CL |
80 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
81 | if (!p->pagevec) { | |
3feb2d49 TM |
82 | mempool_free(p, nfs_wdata_mempool); |
83 | p = NULL; | |
84 | } | |
85 | } | |
86 | } | |
87 | return p; | |
88 | } | |
89 | ||
5e4424af | 90 | static void nfs_writedata_free(struct nfs_write_data *p) |
3feb2d49 TM |
91 | { |
92 | if (p && (p->pagevec != &p->page_array[0])) | |
93 | kfree(p->pagevec); | |
94 | mempool_free(p, nfs_wdata_mempool); | |
95 | } | |
96 | ||
383ba719 | 97 | void nfs_writedata_release(void *data) |
1da177e4 | 98 | { |
383ba719 TM |
99 | struct nfs_write_data *wdata = data; |
100 | ||
101 | put_nfs_open_context(wdata->args.context); | |
1da177e4 LT |
102 | nfs_writedata_free(wdata); |
103 | } | |
104 | ||
7b159fc1 TM |
105 | static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error) |
106 | { | |
107 | ctx->error = error; | |
108 | smp_wmb(); | |
109 | set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
110 | } | |
111 | ||
277459d2 TM |
112 | static struct nfs_page *nfs_page_find_request_locked(struct page *page) |
113 | { | |
114 | struct nfs_page *req = NULL; | |
115 | ||
116 | if (PagePrivate(page)) { | |
117 | req = (struct nfs_page *)page_private(page); | |
118 | if (req != NULL) | |
c03b4024 | 119 | kref_get(&req->wb_kref); |
277459d2 TM |
120 | } |
121 | return req; | |
122 | } | |
123 | ||
124 | static struct nfs_page *nfs_page_find_request(struct page *page) | |
125 | { | |
587142f8 | 126 | struct inode *inode = page->mapping->host; |
277459d2 | 127 | struct nfs_page *req = NULL; |
277459d2 | 128 | |
587142f8 | 129 | spin_lock(&inode->i_lock); |
277459d2 | 130 | req = nfs_page_find_request_locked(page); |
587142f8 | 131 | spin_unlock(&inode->i_lock); |
277459d2 TM |
132 | return req; |
133 | } | |
134 | ||
1da177e4 LT |
135 | /* Adjust the file length if we're writing beyond the end */ |
136 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) | |
137 | { | |
138 | struct inode *inode = page->mapping->host; | |
139 | loff_t end, i_size = i_size_read(inode); | |
ca52fec1 | 140 | pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; |
1da177e4 LT |
141 | |
142 | if (i_size > 0 && page->index < end_index) | |
143 | return; | |
144 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); | |
145 | if (i_size >= end) | |
146 | return; | |
91d5b470 | 147 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
1da177e4 LT |
148 | i_size_write(inode, end); |
149 | } | |
150 | ||
a301b777 TM |
151 | /* A writeback failed: mark the page as bad, and invalidate the page cache */ |
152 | static void nfs_set_pageerror(struct page *page) | |
153 | { | |
154 | SetPageError(page); | |
155 | nfs_zap_mapping(page->mapping->host, page->mapping); | |
156 | } | |
157 | ||
1da177e4 LT |
158 | /* We can set the PG_uptodate flag if we see that a write request |
159 | * covers the full page. | |
160 | */ | |
161 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) | |
162 | { | |
1da177e4 LT |
163 | if (PageUptodate(page)) |
164 | return; | |
165 | if (base != 0) | |
166 | return; | |
49a70f27 | 167 | if (count != nfs_page_length(page)) |
1da177e4 | 168 | return; |
49a70f27 | 169 | SetPageUptodate(page); |
1da177e4 LT |
170 | } |
171 | ||
e21195a7 | 172 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
1da177e4 LT |
173 | unsigned int offset, unsigned int count) |
174 | { | |
175 | struct nfs_page *req; | |
e21195a7 | 176 | int ret; |
1da177e4 | 177 | |
e21195a7 TM |
178 | for (;;) { |
179 | req = nfs_update_request(ctx, page, offset, count); | |
180 | if (!IS_ERR(req)) | |
181 | break; | |
182 | ret = PTR_ERR(req); | |
183 | if (ret != -EBUSY) | |
184 | return ret; | |
185 | ret = nfs_wb_page(page->mapping->host, page); | |
186 | if (ret != 0) | |
187 | return ret; | |
188 | } | |
1da177e4 LT |
189 | /* Update file length */ |
190 | nfs_grow_file(page, offset, count); | |
acee478a | 191 | nfs_clear_page_tag_locked(req); |
abd3e641 | 192 | return 0; |
1da177e4 LT |
193 | } |
194 | ||
195 | static int wb_priority(struct writeback_control *wbc) | |
196 | { | |
197 | if (wbc->for_reclaim) | |
c63c7b05 | 198 | return FLUSH_HIGHPRI | FLUSH_STABLE; |
1da177e4 LT |
199 | if (wbc->for_kupdate) |
200 | return FLUSH_LOWPRI; | |
201 | return 0; | |
202 | } | |
203 | ||
89a09141 PZ |
204 | /* |
205 | * NFS congestion control | |
206 | */ | |
207 | ||
208 | int nfs_congestion_kb; | |
209 | ||
210 | #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) | |
211 | #define NFS_CONGESTION_OFF_THRESH \ | |
212 | (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) | |
213 | ||
5a6d41b3 | 214 | static int nfs_set_page_writeback(struct page *page) |
89a09141 | 215 | { |
5a6d41b3 TM |
216 | int ret = test_set_page_writeback(page); |
217 | ||
218 | if (!ret) { | |
89a09141 PZ |
219 | struct inode *inode = page->mapping->host; |
220 | struct nfs_server *nfss = NFS_SERVER(inode); | |
221 | ||
277866a0 | 222 | if (atomic_long_inc_return(&nfss->writeback) > |
89a09141 PZ |
223 | NFS_CONGESTION_ON_THRESH) |
224 | set_bdi_congested(&nfss->backing_dev_info, WRITE); | |
225 | } | |
5a6d41b3 | 226 | return ret; |
89a09141 PZ |
227 | } |
228 | ||
229 | static void nfs_end_page_writeback(struct page *page) | |
230 | { | |
231 | struct inode *inode = page->mapping->host; | |
232 | struct nfs_server *nfss = NFS_SERVER(inode); | |
233 | ||
234 | end_page_writeback(page); | |
c4dc4bee | 235 | if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) |
89a09141 | 236 | clear_bdi_congested(&nfss->backing_dev_info, WRITE); |
89a09141 PZ |
237 | } |
238 | ||
e261f51f TM |
239 | /* |
240 | * Find an associated nfs write request, and prepare to flush it out | |
9cccef95 | 241 | * May return an error if the user signalled nfs_wait_on_request(). |
e261f51f | 242 | */ |
c63c7b05 TM |
243 | static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, |
244 | struct page *page) | |
e261f51f | 245 | { |
587142f8 | 246 | struct inode *inode = page->mapping->host; |
e261f51f | 247 | struct nfs_page *req; |
e261f51f TM |
248 | int ret; |
249 | ||
587142f8 | 250 | spin_lock(&inode->i_lock); |
e261f51f TM |
251 | for(;;) { |
252 | req = nfs_page_find_request_locked(page); | |
253 | if (req == NULL) { | |
587142f8 | 254 | spin_unlock(&inode->i_lock); |
9cccef95 | 255 | return 0; |
e261f51f | 256 | } |
acee478a | 257 | if (nfs_set_page_tag_locked(req)) |
e261f51f TM |
258 | break; |
259 | /* Note: If we hold the page lock, as is the case in nfs_writepage, | |
acee478a | 260 | * then the call to nfs_set_page_tag_locked() will always |
e261f51f TM |
261 | * succeed provided that someone hasn't already marked the |
262 | * request as dirty (in which case we don't care). | |
263 | */ | |
587142f8 | 264 | spin_unlock(&inode->i_lock); |
e261f51f TM |
265 | ret = nfs_wait_on_request(req); |
266 | nfs_release_request(req); | |
267 | if (ret != 0) | |
268 | return ret; | |
587142f8 | 269 | spin_lock(&inode->i_lock); |
e261f51f | 270 | } |
612c9384 TM |
271 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
272 | /* This request is marked for commit */ | |
587142f8 | 273 | spin_unlock(&inode->i_lock); |
acee478a | 274 | nfs_clear_page_tag_locked(req); |
c63c7b05 | 275 | nfs_pageio_complete(pgio); |
9cccef95 | 276 | return 0; |
612c9384 | 277 | } |
c63c7b05 | 278 | if (nfs_set_page_writeback(page) != 0) { |
587142f8 | 279 | spin_unlock(&inode->i_lock); |
c63c7b05 TM |
280 | BUG(); |
281 | } | |
587142f8 | 282 | spin_unlock(&inode->i_lock); |
f8512ad0 FI |
283 | if (!nfs_pageio_add_request(pgio, req)) { |
284 | nfs_redirty_request(req); | |
f8512ad0 FI |
285 | return pgio->pg_error; |
286 | } | |
9cccef95 | 287 | return 0; |
e261f51f TM |
288 | } |
289 | ||
f758c885 | 290 | static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) |
1da177e4 | 291 | { |
1da177e4 | 292 | struct inode *inode = page->mapping->host; |
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); |
f758c885 TM |
298 | return nfs_page_async_flush(pgio, page); |
299 | } | |
7fe7f848 | 300 | |
f758c885 TM |
301 | /* |
302 | * Write an mmapped page to the server. | |
303 | */ | |
304 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
305 | { | |
306 | struct nfs_pageio_descriptor pgio; | |
307 | int err; | |
49a70f27 | 308 | |
f758c885 TM |
309 | nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc)); |
310 | err = nfs_do_writepage(page, wbc, &pgio); | |
311 | nfs_pageio_complete(&pgio); | |
312 | if (err < 0) | |
313 | return err; | |
314 | if (pgio.pg_error < 0) | |
315 | return pgio.pg_error; | |
316 | return 0; | |
4d770ccf TM |
317 | } |
318 | ||
319 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
320 | { | |
f758c885 | 321 | int ret; |
4d770ccf | 322 | |
f758c885 | 323 | ret = nfs_writepage_locked(page, wbc); |
1da177e4 | 324 | unlock_page(page); |
f758c885 TM |
325 | return ret; |
326 | } | |
327 | ||
328 | static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) | |
329 | { | |
330 | int ret; | |
331 | ||
332 | ret = nfs_do_writepage(page, wbc, data); | |
333 | unlock_page(page); | |
334 | return ret; | |
1da177e4 LT |
335 | } |
336 | ||
1da177e4 LT |
337 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) |
338 | { | |
1da177e4 | 339 | struct inode *inode = mapping->host; |
c63c7b05 | 340 | struct nfs_pageio_descriptor pgio; |
1da177e4 LT |
341 | int err; |
342 | ||
91d5b470 CL |
343 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
344 | ||
c63c7b05 | 345 | nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); |
f758c885 | 346 | err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); |
c63c7b05 | 347 | nfs_pageio_complete(&pgio); |
f758c885 | 348 | if (err < 0) |
1da177e4 | 349 | return err; |
f758c885 | 350 | if (pgio.pg_error < 0) |
c63c7b05 TM |
351 | return pgio.pg_error; |
352 | return 0; | |
1da177e4 LT |
353 | } |
354 | ||
355 | /* | |
356 | * Insert a write request into an inode | |
357 | */ | |
27852596 | 358 | static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req) |
1da177e4 LT |
359 | { |
360 | struct nfs_inode *nfsi = NFS_I(inode); | |
361 | int error; | |
362 | ||
363 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); | |
27852596 | 364 | BUG_ON(error); |
1da177e4 LT |
365 | if (!nfsi->npages) { |
366 | igrab(inode); | |
1da177e4 LT |
367 | if (nfs_have_delegation(inode, FMODE_WRITE)) |
368 | nfsi->change_attr++; | |
369 | } | |
deb7d638 | 370 | SetPagePrivate(req->wb_page); |
277459d2 | 371 | set_page_private(req->wb_page, (unsigned long)req); |
1da177e4 | 372 | nfsi->npages++; |
c03b4024 | 373 | kref_get(&req->wb_kref); |
27852596 NP |
374 | radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, |
375 | NFS_PAGE_TAG_LOCKED); | |
1da177e4 LT |
376 | } |
377 | ||
378 | /* | |
89a09141 | 379 | * Remove a write request from an inode |
1da177e4 LT |
380 | */ |
381 | static void nfs_inode_remove_request(struct nfs_page *req) | |
382 | { | |
88be9f99 | 383 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
384 | struct nfs_inode *nfsi = NFS_I(inode); |
385 | ||
386 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
387 | ||
587142f8 | 388 | spin_lock(&inode->i_lock); |
277459d2 | 389 | set_page_private(req->wb_page, 0); |
deb7d638 | 390 | ClearPagePrivate(req->wb_page); |
1da177e4 LT |
391 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
392 | nfsi->npages--; | |
393 | if (!nfsi->npages) { | |
587142f8 | 394 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
395 | iput(inode); |
396 | } else | |
587142f8 | 397 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
398 | nfs_clear_request(req); |
399 | nfs_release_request(req); | |
400 | } | |
401 | ||
61822ab5 | 402 | static void |
6d884e8f | 403 | nfs_mark_request_dirty(struct nfs_page *req) |
61822ab5 | 404 | { |
61822ab5 TM |
405 | __set_page_dirty_nobuffers(req->wb_page); |
406 | } | |
407 | ||
1da177e4 LT |
408 | /* |
409 | * Check if a request is dirty | |
410 | */ | |
411 | static inline int | |
412 | nfs_dirty_request(struct nfs_page *req) | |
413 | { | |
5a6d41b3 TM |
414 | struct page *page = req->wb_page; |
415 | ||
612c9384 | 416 | if (page == NULL || test_bit(PG_NEED_COMMIT, &req->wb_flags)) |
5a6d41b3 | 417 | return 0; |
38def50f | 418 | return !PageWriteback(page); |
1da177e4 LT |
419 | } |
420 | ||
421 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
422 | /* | |
423 | * Add a request to the inode's commit list. | |
424 | */ | |
425 | static void | |
426 | nfs_mark_request_commit(struct nfs_page *req) | |
427 | { | |
88be9f99 | 428 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
429 | struct nfs_inode *nfsi = NFS_I(inode); |
430 | ||
587142f8 | 431 | spin_lock(&inode->i_lock); |
1da177e4 | 432 | nfsi->ncommit++; |
612c9384 | 433 | set_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
5c369683 TM |
434 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
435 | req->wb_index, | |
436 | NFS_PAGE_TAG_COMMIT); | |
587142f8 | 437 | spin_unlock(&inode->i_lock); |
fd39fc85 | 438 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 | 439 | inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE); |
a1803044 | 440 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1da177e4 | 441 | } |
8e821cad TM |
442 | |
443 | static inline | |
444 | int nfs_write_need_commit(struct nfs_write_data *data) | |
445 | { | |
446 | return data->verf.committed != NFS_FILE_SYNC; | |
447 | } | |
448 | ||
449 | static inline | |
450 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
451 | { | |
612c9384 | 452 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
8e821cad TM |
453 | nfs_mark_request_commit(req); |
454 | return 1; | |
455 | } | |
456 | if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { | |
6d884e8f | 457 | nfs_mark_request_dirty(req); |
8e821cad TM |
458 | return 1; |
459 | } | |
460 | return 0; | |
461 | } | |
462 | #else | |
463 | static inline void | |
464 | nfs_mark_request_commit(struct nfs_page *req) | |
465 | { | |
466 | } | |
467 | ||
468 | static inline | |
469 | int nfs_write_need_commit(struct nfs_write_data *data) | |
470 | { | |
471 | return 0; | |
472 | } | |
473 | ||
474 | static inline | |
475 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
476 | { | |
477 | return 0; | |
478 | } | |
1da177e4 LT |
479 | #endif |
480 | ||
481 | /* | |
482 | * Wait for a request to complete. | |
483 | * | |
150030b7 | 484 | * Interruptible by fatal signals only. |
1da177e4 | 485 | */ |
ca52fec1 | 486 | static int nfs_wait_on_requests_locked(struct inode *inode, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
487 | { |
488 | struct nfs_inode *nfsi = NFS_I(inode); | |
489 | struct nfs_page *req; | |
ca52fec1 | 490 | pgoff_t idx_end, next; |
1da177e4 LT |
491 | unsigned int res = 0; |
492 | int error; | |
493 | ||
494 | if (npages == 0) | |
495 | idx_end = ~0; | |
496 | else | |
497 | idx_end = idx_start + npages - 1; | |
498 | ||
1da177e4 | 499 | next = idx_start; |
9fd367f0 | 500 | while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_LOCKED)) { |
1da177e4 LT |
501 | if (req->wb_index > idx_end) |
502 | break; | |
503 | ||
504 | next = req->wb_index + 1; | |
c6a556b8 | 505 | BUG_ON(!NFS_WBACK_BUSY(req)); |
1da177e4 | 506 | |
c03b4024 | 507 | kref_get(&req->wb_kref); |
587142f8 | 508 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
509 | error = nfs_wait_on_request(req); |
510 | nfs_release_request(req); | |
587142f8 | 511 | spin_lock(&inode->i_lock); |
1da177e4 LT |
512 | if (error < 0) |
513 | return error; | |
1da177e4 LT |
514 | res++; |
515 | } | |
1da177e4 LT |
516 | return res; |
517 | } | |
518 | ||
83715ad5 TM |
519 | static void nfs_cancel_commit_list(struct list_head *head) |
520 | { | |
521 | struct nfs_page *req; | |
522 | ||
523 | while(!list_empty(head)) { | |
524 | req = nfs_list_entry(head->next); | |
b6dff26a | 525 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 PZ |
526 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
527 | BDI_RECLAIMABLE); | |
83715ad5 | 528 | nfs_list_remove_request(req); |
612c9384 | 529 | clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
83715ad5 | 530 | nfs_inode_remove_request(req); |
b6dff26a | 531 | nfs_unlock_request(req); |
83715ad5 TM |
532 | } |
533 | } | |
534 | ||
1da177e4 LT |
535 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
536 | /* | |
537 | * nfs_scan_commit - Scan an inode for commit requests | |
538 | * @inode: NFS inode to scan | |
539 | * @dst: destination list | |
540 | * @idx_start: lower bound of page->index to scan. | |
541 | * @npages: idx_start + npages sets the upper bound to scan. | |
542 | * | |
543 | * Moves requests from the inode's 'commit' request list. | |
544 | * The requests are *not* checked to ensure that they form a contiguous set. | |
545 | */ | |
546 | static int | |
ca52fec1 | 547 | nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
548 | { |
549 | struct nfs_inode *nfsi = NFS_I(inode); | |
3da28eb1 TM |
550 | int res = 0; |
551 | ||
552 | if (nfsi->ncommit != 0) { | |
5c369683 TM |
553 | res = nfs_scan_list(nfsi, dst, idx_start, npages, |
554 | NFS_PAGE_TAG_COMMIT); | |
3da28eb1 | 555 | nfsi->ncommit -= res; |
3da28eb1 | 556 | } |
1da177e4 LT |
557 | return res; |
558 | } | |
c42de9dd | 559 | #else |
ca52fec1 | 560 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
c42de9dd TM |
561 | { |
562 | return 0; | |
563 | } | |
1da177e4 LT |
564 | #endif |
565 | ||
1da177e4 LT |
566 | /* |
567 | * Try to update any existing write request, or create one if there is none. | |
568 | * In order to match, the request's credentials must match those of | |
569 | * the calling process. | |
570 | * | |
571 | * Note: Should always be called with the Page Lock held! | |
572 | */ | |
573 | static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, | |
e21195a7 | 574 | struct page *page, unsigned int offset, unsigned int bytes) |
1da177e4 | 575 | { |
89a09141 PZ |
576 | struct address_space *mapping = page->mapping; |
577 | struct inode *inode = mapping->host; | |
1da177e4 | 578 | struct nfs_page *req, *new = NULL; |
ca52fec1 | 579 | pgoff_t rqend, end; |
1da177e4 LT |
580 | |
581 | end = offset + bytes; | |
582 | ||
1da177e4 LT |
583 | for (;;) { |
584 | /* Loop over all inode entries and see if we find | |
585 | * A request for the page we wish to update | |
586 | */ | |
27852596 NP |
587 | if (new) { |
588 | if (radix_tree_preload(GFP_NOFS)) { | |
589 | nfs_release_request(new); | |
590 | return ERR_PTR(-ENOMEM); | |
591 | } | |
592 | } | |
593 | ||
587142f8 | 594 | spin_lock(&inode->i_lock); |
277459d2 | 595 | req = nfs_page_find_request_locked(page); |
1da177e4 | 596 | if (req) { |
acee478a | 597 | if (!nfs_set_page_tag_locked(req)) { |
1da177e4 | 598 | int error; |
277459d2 | 599 | |
587142f8 | 600 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
601 | error = nfs_wait_on_request(req); |
602 | nfs_release_request(req); | |
1dd594b2 | 603 | if (error < 0) { |
27852596 NP |
604 | if (new) { |
605 | radix_tree_preload_end(); | |
1dd594b2 | 606 | nfs_release_request(new); |
27852596 | 607 | } |
1da177e4 | 608 | return ERR_PTR(error); |
1dd594b2 | 609 | } |
1da177e4 LT |
610 | continue; |
611 | } | |
587142f8 | 612 | spin_unlock(&inode->i_lock); |
27852596 NP |
613 | if (new) { |
614 | radix_tree_preload_end(); | |
1da177e4 | 615 | nfs_release_request(new); |
27852596 | 616 | } |
1da177e4 LT |
617 | break; |
618 | } | |
619 | ||
620 | if (new) { | |
1da177e4 | 621 | nfs_lock_request_dontget(new); |
27852596 | 622 | nfs_inode_add_request(inode, new); |
587142f8 | 623 | spin_unlock(&inode->i_lock); |
27852596 | 624 | radix_tree_preload_end(); |
61e930a9 TM |
625 | req = new; |
626 | goto zero_page; | |
1da177e4 | 627 | } |
587142f8 | 628 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
629 | |
630 | new = nfs_create_request(ctx, inode, page, offset, bytes); | |
631 | if (IS_ERR(new)) | |
632 | return new; | |
633 | } | |
634 | ||
635 | /* We have a request for our page. | |
636 | * If the creds don't match, or the | |
637 | * page addresses don't match, | |
638 | * tell the caller to wait on the conflicting | |
639 | * request. | |
640 | */ | |
641 | rqend = req->wb_offset + req->wb_bytes; | |
642 | if (req->wb_context != ctx | |
643 | || req->wb_page != page | |
644 | || !nfs_dirty_request(req) | |
645 | || offset > rqend || end < req->wb_offset) { | |
acee478a | 646 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
647 | return ERR_PTR(-EBUSY); |
648 | } | |
649 | ||
650 | /* Okay, the request matches. Update the region */ | |
651 | if (offset < req->wb_offset) { | |
652 | req->wb_offset = offset; | |
653 | req->wb_pgbase = offset; | |
61e930a9 TM |
654 | req->wb_bytes = max(end, rqend) - req->wb_offset; |
655 | goto zero_page; | |
1da177e4 LT |
656 | } |
657 | ||
658 | if (end > rqend) | |
659 | req->wb_bytes = end - req->wb_offset; | |
660 | ||
661 | return req; | |
61e930a9 TM |
662 | zero_page: |
663 | /* If this page might potentially be marked as up to date, | |
664 | * then we need to zero any uninitalised data. */ | |
665 | if (req->wb_pgbase == 0 && req->wb_bytes != PAGE_CACHE_SIZE | |
666 | && !PageUptodate(req->wb_page)) | |
eebd2aa3 | 667 | zero_user_segment(req->wb_page, req->wb_bytes, PAGE_CACHE_SIZE); |
61e930a9 | 668 | return req; |
1da177e4 LT |
669 | } |
670 | ||
671 | int nfs_flush_incompatible(struct file *file, struct page *page) | |
672 | { | |
cd3758e3 | 673 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 674 | struct nfs_page *req; |
1a54533e | 675 | int do_flush, status; |
1da177e4 LT |
676 | /* |
677 | * Look for a request corresponding to this page. If there | |
678 | * is one, and it belongs to another file, we flush it out | |
679 | * before we try to copy anything into the page. Do this | |
680 | * due to the lack of an ACCESS-type call in NFSv2. | |
681 | * Also do the same if we find a request from an existing | |
682 | * dropped page. | |
683 | */ | |
1a54533e TM |
684 | do { |
685 | req = nfs_page_find_request(page); | |
686 | if (req == NULL) | |
687 | return 0; | |
688 | do_flush = req->wb_page != page || req->wb_context != ctx | |
e261f51f | 689 | || !nfs_dirty_request(req); |
1da177e4 | 690 | nfs_release_request(req); |
1a54533e TM |
691 | if (!do_flush) |
692 | return 0; | |
693 | status = nfs_wb_page(page->mapping->host, page); | |
694 | } while (status == 0); | |
695 | return status; | |
1da177e4 LT |
696 | } |
697 | ||
5d47a356 TM |
698 | /* |
699 | * If the page cache is marked as unsafe or invalid, then we can't rely on | |
700 | * the PageUptodate() flag. In this case, we will need to turn off | |
701 | * write optimisations that depend on the page contents being correct. | |
702 | */ | |
703 | static int nfs_write_pageuptodate(struct page *page, struct inode *inode) | |
704 | { | |
705 | return PageUptodate(page) && | |
706 | !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA)); | |
707 | } | |
708 | ||
1da177e4 LT |
709 | /* |
710 | * Update and possibly write a cached page of an NFS file. | |
711 | * | |
712 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
713 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
714 | */ | |
715 | int nfs_updatepage(struct file *file, struct page *page, | |
716 | unsigned int offset, unsigned int count) | |
717 | { | |
cd3758e3 | 718 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 719 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
720 | int status = 0; |
721 | ||
91d5b470 CL |
722 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
723 | ||
1da177e4 | 724 | dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", |
01cce933 JJS |
725 | file->f_path.dentry->d_parent->d_name.name, |
726 | file->f_path.dentry->d_name.name, count, | |
0bbacc40 | 727 | (long long)(page_offset(page) +offset)); |
1da177e4 | 728 | |
1da177e4 | 729 | /* If we're not using byte range locks, and we know the page |
5d47a356 TM |
730 | * is up to date, it may be more efficient to extend the write |
731 | * to cover the entire page in order to avoid fragmentation | |
732 | * inefficiencies. | |
1da177e4 | 733 | */ |
5d47a356 TM |
734 | if (nfs_write_pageuptodate(page, inode) && |
735 | inode->i_flock == NULL && | |
4b5621f6 | 736 | !(file->f_flags & O_SYNC)) { |
49a70f27 | 737 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 738 | offset = 0; |
1da177e4 LT |
739 | } |
740 | ||
e21195a7 | 741 | status = nfs_writepage_setup(ctx, page, offset, count); |
03fa9e84 TM |
742 | if (status < 0) |
743 | nfs_set_pageerror(page); | |
744 | else | |
745 | __set_page_dirty_nobuffers(page); | |
1da177e4 | 746 | |
1da177e4 LT |
747 | dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", |
748 | status, (long long)i_size_read(inode)); | |
1da177e4 LT |
749 | return status; |
750 | } | |
751 | ||
752 | static void nfs_writepage_release(struct nfs_page *req) | |
753 | { | |
1da177e4 | 754 | |
44dd151d TM |
755 | if (PageError(req->wb_page)) { |
756 | nfs_end_page_writeback(req->wb_page); | |
757 | nfs_inode_remove_request(req); | |
758 | } else if (!nfs_reschedule_unstable_write(req)) { | |
759 | /* Set the PG_uptodate flag */ | |
760 | nfs_mark_uptodate(req->wb_page, req->wb_pgbase, req->wb_bytes); | |
8e821cad TM |
761 | nfs_end_page_writeback(req->wb_page); |
762 | nfs_inode_remove_request(req); | |
763 | } else | |
764 | nfs_end_page_writeback(req->wb_page); | |
9fd367f0 | 765 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
766 | } |
767 | ||
3ff7576d | 768 | static int flush_task_priority(int how) |
1da177e4 LT |
769 | { |
770 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
771 | case FLUSH_HIGHPRI: | |
772 | return RPC_PRIORITY_HIGH; | |
773 | case FLUSH_LOWPRI: | |
774 | return RPC_PRIORITY_LOW; | |
775 | } | |
776 | return RPC_PRIORITY_NORMAL; | |
777 | } | |
778 | ||
779 | /* | |
780 | * Set up the argument/result storage required for the RPC call. | |
781 | */ | |
dbae4c73 | 782 | static int nfs_write_rpcsetup(struct nfs_page *req, |
1da177e4 | 783 | struct nfs_write_data *data, |
788e7a89 | 784 | const struct rpc_call_ops *call_ops, |
1da177e4 LT |
785 | unsigned int count, unsigned int offset, |
786 | int how) | |
787 | { | |
84115e1c TM |
788 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
789 | int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
3ff7576d | 790 | int priority = flush_task_priority(how); |
07737691 | 791 | struct rpc_task *task; |
bdc7f021 TM |
792 | struct rpc_message msg = { |
793 | .rpc_argp = &data->args, | |
794 | .rpc_resp = &data->res, | |
795 | .rpc_cred = req->wb_context->cred, | |
796 | }; | |
84115e1c TM |
797 | struct rpc_task_setup task_setup_data = { |
798 | .rpc_client = NFS_CLIENT(inode), | |
07737691 | 799 | .task = &data->task, |
bdc7f021 | 800 | .rpc_message = &msg, |
84115e1c TM |
801 | .callback_ops = call_ops, |
802 | .callback_data = data, | |
101070ca | 803 | .workqueue = nfsiod_workqueue, |
84115e1c | 804 | .flags = flags, |
3ff7576d | 805 | .priority = priority, |
84115e1c | 806 | }; |
1da177e4 LT |
807 | |
808 | /* Set up the RPC argument and reply structs | |
809 | * NB: take care not to mess about with data->commit et al. */ | |
810 | ||
811 | data->req = req; | |
88be9f99 | 812 | data->inode = inode = req->wb_context->path.dentry->d_inode; |
bdc7f021 | 813 | data->cred = msg.rpc_cred; |
1da177e4 LT |
814 | |
815 | data->args.fh = NFS_FH(inode); | |
816 | data->args.offset = req_offset(req) + offset; | |
817 | data->args.pgbase = req->wb_pgbase + offset; | |
818 | data->args.pages = data->pagevec; | |
819 | data->args.count = count; | |
383ba719 | 820 | data->args.context = get_nfs_open_context(req->wb_context); |
bdc7f021 TM |
821 | data->args.stable = NFS_UNSTABLE; |
822 | if (how & FLUSH_STABLE) { | |
823 | data->args.stable = NFS_DATA_SYNC; | |
824 | if (!NFS_I(inode)->ncommit) | |
825 | data->args.stable = NFS_FILE_SYNC; | |
826 | } | |
1da177e4 LT |
827 | |
828 | data->res.fattr = &data->fattr; | |
829 | data->res.count = count; | |
830 | data->res.verf = &data->verf; | |
0e574af1 | 831 | nfs_fattr_init(&data->fattr); |
1da177e4 | 832 | |
788e7a89 | 833 | /* Set up the initial task struct. */ |
bdc7f021 | 834 | NFS_PROTO(inode)->write_setup(data, &msg); |
1da177e4 | 835 | |
a3f565b1 CL |
836 | dprintk("NFS: %5u initiated write call " |
837 | "(req %s/%Ld, %u bytes @ offset %Lu)\n", | |
0bbacc40 | 838 | data->task.tk_pid, |
1da177e4 LT |
839 | inode->i_sb->s_id, |
840 | (long long)NFS_FILEID(inode), | |
841 | count, | |
842 | (unsigned long long)data->args.offset); | |
1da177e4 | 843 | |
07737691 | 844 | task = rpc_run_task(&task_setup_data); |
dbae4c73 TM |
845 | if (IS_ERR(task)) |
846 | return PTR_ERR(task); | |
847 | rpc_put_task(task); | |
848 | return 0; | |
1da177e4 LT |
849 | } |
850 | ||
6d884e8f F |
851 | /* If a nfs_flush_* function fails, it should remove reqs from @head and |
852 | * call this on each, which will prepare them to be retried on next | |
853 | * writeback using standard nfs. | |
854 | */ | |
855 | static void nfs_redirty_request(struct nfs_page *req) | |
856 | { | |
857 | nfs_mark_request_dirty(req); | |
858 | nfs_end_page_writeback(req->wb_page); | |
859 | nfs_clear_page_tag_locked(req); | |
860 | } | |
861 | ||
1da177e4 LT |
862 | /* |
863 | * Generate multiple small requests to write out a single | |
864 | * contiguous dirty area on one page. | |
865 | */ | |
8d5658c9 | 866 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
867 | { |
868 | struct nfs_page *req = nfs_list_entry(head->next); | |
869 | struct page *page = req->wb_page; | |
870 | struct nfs_write_data *data; | |
e9f7bee1 TM |
871 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
872 | unsigned int offset; | |
1da177e4 | 873 | int requests = 0; |
dbae4c73 | 874 | int ret = 0; |
1da177e4 LT |
875 | LIST_HEAD(list); |
876 | ||
877 | nfs_list_remove_request(req); | |
878 | ||
bcb71bba | 879 | nbytes = count; |
e9f7bee1 TM |
880 | do { |
881 | size_t len = min(nbytes, wsize); | |
882 | ||
8d5658c9 | 883 | data = nfs_writedata_alloc(1); |
1da177e4 LT |
884 | if (!data) |
885 | goto out_bad; | |
886 | list_add(&data->pages, &list); | |
887 | requests++; | |
e9f7bee1 TM |
888 | nbytes -= len; |
889 | } while (nbytes != 0); | |
1da177e4 LT |
890 | atomic_set(&req->wb_complete, requests); |
891 | ||
892 | ClearPageError(page); | |
1da177e4 | 893 | offset = 0; |
bcb71bba | 894 | nbytes = count; |
1da177e4 | 895 | do { |
dbae4c73 TM |
896 | int ret2; |
897 | ||
1da177e4 LT |
898 | data = list_entry(list.next, struct nfs_write_data, pages); |
899 | list_del_init(&data->pages); | |
900 | ||
901 | data->pagevec[0] = page; | |
1da177e4 | 902 | |
bcb71bba TM |
903 | if (nbytes < wsize) |
904 | wsize = nbytes; | |
dbae4c73 | 905 | ret2 = nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
bcb71bba | 906 | wsize, offset, how); |
dbae4c73 TM |
907 | if (ret == 0) |
908 | ret = ret2; | |
bcb71bba TM |
909 | offset += wsize; |
910 | nbytes -= wsize; | |
1da177e4 LT |
911 | } while (nbytes != 0); |
912 | ||
dbae4c73 | 913 | return ret; |
1da177e4 LT |
914 | |
915 | out_bad: | |
916 | while (!list_empty(&list)) { | |
917 | data = list_entry(list.next, struct nfs_write_data, pages); | |
918 | list_del(&data->pages); | |
8aca67f0 | 919 | nfs_writedata_release(data); |
1da177e4 | 920 | } |
61822ab5 | 921 | nfs_redirty_request(req); |
1da177e4 LT |
922 | return -ENOMEM; |
923 | } | |
924 | ||
925 | /* | |
926 | * Create an RPC task for the given write request and kick it. | |
927 | * The page must have been locked by the caller. | |
928 | * | |
929 | * It may happen that the page we're passed is not marked dirty. | |
930 | * This is the case if nfs_updatepage detects a conflicting request | |
931 | * that has been written but not committed. | |
932 | */ | |
8d5658c9 | 933 | static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
934 | { |
935 | struct nfs_page *req; | |
936 | struct page **pages; | |
937 | struct nfs_write_data *data; | |
1da177e4 | 938 | |
8d5658c9 | 939 | data = nfs_writedata_alloc(npages); |
1da177e4 LT |
940 | if (!data) |
941 | goto out_bad; | |
942 | ||
943 | pages = data->pagevec; | |
1da177e4 LT |
944 | while (!list_empty(head)) { |
945 | req = nfs_list_entry(head->next); | |
946 | nfs_list_remove_request(req); | |
947 | nfs_list_add_request(req, &data->pages); | |
948 | ClearPageError(req->wb_page); | |
1da177e4 | 949 | *pages++ = req->wb_page; |
1da177e4 LT |
950 | } |
951 | req = nfs_list_entry(data->pages.next); | |
952 | ||
1da177e4 | 953 | /* Set up the argument struct */ |
dbae4c73 | 954 | return nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 LT |
955 | out_bad: |
956 | while (!list_empty(head)) { | |
10afec90 | 957 | req = nfs_list_entry(head->next); |
1da177e4 | 958 | nfs_list_remove_request(req); |
61822ab5 | 959 | nfs_redirty_request(req); |
1da177e4 LT |
960 | } |
961 | return -ENOMEM; | |
962 | } | |
963 | ||
c63c7b05 TM |
964 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, |
965 | struct inode *inode, int ioflags) | |
1da177e4 | 966 | { |
bf4285e7 | 967 | size_t wsize = NFS_SERVER(inode)->wsize; |
1da177e4 | 968 | |
bcb71bba | 969 | if (wsize < PAGE_CACHE_SIZE) |
c63c7b05 | 970 | nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); |
bcb71bba | 971 | else |
c63c7b05 | 972 | nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); |
1da177e4 LT |
973 | } |
974 | ||
975 | /* | |
976 | * Handle a write reply that flushed part of a page. | |
977 | */ | |
788e7a89 | 978 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 979 | { |
788e7a89 | 980 | struct nfs_write_data *data = calldata; |
1da177e4 | 981 | struct nfs_page *req = data->req; |
1da177e4 LT |
982 | |
983 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
88be9f99 TM |
984 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
985 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
986 | req->wb_bytes, |
987 | (long long)req_offset(req)); | |
988 | ||
c9d8f89d TM |
989 | nfs_writeback_done(task, data); |
990 | } | |
788e7a89 | 991 | |
c9d8f89d TM |
992 | static void nfs_writeback_release_partial(void *calldata) |
993 | { | |
994 | struct nfs_write_data *data = calldata; | |
995 | struct nfs_page *req = data->req; | |
996 | struct page *page = req->wb_page; | |
997 | int status = data->task.tk_status; | |
998 | ||
999 | if (status < 0) { | |
a301b777 | 1000 | nfs_set_pageerror(page); |
c9d8f89d TM |
1001 | nfs_context_set_write_error(req->wb_context, status); |
1002 | dprintk(", error = %d\n", status); | |
8e821cad | 1003 | goto out; |
1da177e4 LT |
1004 | } |
1005 | ||
8e821cad | 1006 | if (nfs_write_need_commit(data)) { |
587142f8 | 1007 | struct inode *inode = page->mapping->host; |
8e821cad | 1008 | |
587142f8 | 1009 | spin_lock(&inode->i_lock); |
8e821cad TM |
1010 | if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { |
1011 | /* Do nothing we need to resend the writes */ | |
1012 | } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
1013 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1014 | dprintk(" defer commit\n"); | |
1015 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
1016 | set_bit(PG_NEED_RESCHED, &req->wb_flags); | |
1017 | clear_bit(PG_NEED_COMMIT, &req->wb_flags); | |
1018 | dprintk(" server reboot detected\n"); | |
1019 | } | |
587142f8 | 1020 | spin_unlock(&inode->i_lock); |
8e821cad TM |
1021 | } else |
1022 | dprintk(" OK\n"); | |
1023 | ||
1024 | out: | |
1da177e4 LT |
1025 | if (atomic_dec_and_test(&req->wb_complete)) |
1026 | nfs_writepage_release(req); | |
c9d8f89d | 1027 | nfs_writedata_release(calldata); |
1da177e4 LT |
1028 | } |
1029 | ||
788e7a89 TM |
1030 | static const struct rpc_call_ops nfs_write_partial_ops = { |
1031 | .rpc_call_done = nfs_writeback_done_partial, | |
c9d8f89d | 1032 | .rpc_release = nfs_writeback_release_partial, |
788e7a89 TM |
1033 | }; |
1034 | ||
1da177e4 LT |
1035 | /* |
1036 | * Handle a write reply that flushes a whole page. | |
1037 | * | |
1038 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
1039 | * writebacks since the page->count is kept > 1 for as long | |
1040 | * as the page has a write request pending. | |
1041 | */ | |
788e7a89 | 1042 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 1043 | { |
788e7a89 | 1044 | struct nfs_write_data *data = calldata; |
1da177e4 | 1045 | |
c9d8f89d TM |
1046 | nfs_writeback_done(task, data); |
1047 | } | |
1048 | ||
1049 | static void nfs_writeback_release_full(void *calldata) | |
1050 | { | |
1051 | struct nfs_write_data *data = calldata; | |
1052 | int status = data->task.tk_status; | |
788e7a89 | 1053 | |
1da177e4 LT |
1054 | /* Update attributes as result of writeback. */ |
1055 | while (!list_empty(&data->pages)) { | |
c9d8f89d TM |
1056 | struct nfs_page *req = nfs_list_entry(data->pages.next); |
1057 | struct page *page = req->wb_page; | |
1058 | ||
1da177e4 | 1059 | nfs_list_remove_request(req); |
1da177e4 LT |
1060 | |
1061 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
88be9f99 TM |
1062 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1063 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1064 | req->wb_bytes, |
1065 | (long long)req_offset(req)); | |
1066 | ||
c9d8f89d | 1067 | if (status < 0) { |
a301b777 | 1068 | nfs_set_pageerror(page); |
c9d8f89d TM |
1069 | nfs_context_set_write_error(req->wb_context, status); |
1070 | dprintk(", error = %d\n", status); | |
8e821cad | 1071 | goto remove_request; |
1da177e4 | 1072 | } |
1da177e4 | 1073 | |
8e821cad TM |
1074 | if (nfs_write_need_commit(data)) { |
1075 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1076 | nfs_mark_request_commit(req); | |
1077 | nfs_end_page_writeback(page); | |
1078 | dprintk(" marked for commit\n"); | |
1da177e4 LT |
1079 | goto next; |
1080 | } | |
44dd151d TM |
1081 | /* Set the PG_uptodate flag? */ |
1082 | nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); | |
8e821cad TM |
1083 | dprintk(" OK\n"); |
1084 | remove_request: | |
1085 | nfs_end_page_writeback(page); | |
1da177e4 | 1086 | nfs_inode_remove_request(req); |
1da177e4 | 1087 | next: |
9fd367f0 | 1088 | nfs_clear_page_tag_locked(req); |
1da177e4 | 1089 | } |
c9d8f89d | 1090 | nfs_writedata_release(calldata); |
1da177e4 LT |
1091 | } |
1092 | ||
788e7a89 TM |
1093 | static const struct rpc_call_ops nfs_write_full_ops = { |
1094 | .rpc_call_done = nfs_writeback_done_full, | |
c9d8f89d | 1095 | .rpc_release = nfs_writeback_release_full, |
788e7a89 TM |
1096 | }; |
1097 | ||
1098 | ||
1da177e4 LT |
1099 | /* |
1100 | * This function is called when the WRITE call is complete. | |
1101 | */ | |
462d5b32 | 1102 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1103 | { |
1da177e4 LT |
1104 | struct nfs_writeargs *argp = &data->args; |
1105 | struct nfs_writeres *resp = &data->res; | |
788e7a89 | 1106 | int status; |
1da177e4 | 1107 | |
a3f565b1 | 1108 | dprintk("NFS: %5u nfs_writeback_done (status %d)\n", |
1da177e4 LT |
1109 | task->tk_pid, task->tk_status); |
1110 | ||
f551e44f CL |
1111 | /* |
1112 | * ->write_done will attempt to use post-op attributes to detect | |
1113 | * conflicting writes by other clients. A strict interpretation | |
1114 | * of close-to-open would allow us to continue caching even if | |
1115 | * another writer had changed the file, but some applications | |
1116 | * depend on tighter cache coherency when writing. | |
1117 | */ | |
788e7a89 TM |
1118 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1119 | if (status != 0) | |
1120 | return status; | |
91d5b470 CL |
1121 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1122 | ||
1da177e4 LT |
1123 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1124 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1125 | /* We tried a write call, but the server did not | |
1126 | * commit data to stable storage even though we | |
1127 | * requested it. | |
1128 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1129 | * the server reports NFS_DATA_SYNC, but performs | |
1130 | * NFS_FILE_SYNC. We therefore implement this checking | |
1131 | * as a dprintk() in order to avoid filling syslog. | |
1132 | */ | |
1133 | static unsigned long complain; | |
1134 | ||
1135 | if (time_before(complain, jiffies)) { | |
1136 | dprintk("NFS: faulty NFS server %s:" | |
1137 | " (committed = %d) != (stable = %d)\n", | |
54ceac45 | 1138 | NFS_SERVER(data->inode)->nfs_client->cl_hostname, |
1da177e4 LT |
1139 | resp->verf->committed, argp->stable); |
1140 | complain = jiffies + 300 * HZ; | |
1141 | } | |
1142 | } | |
1143 | #endif | |
1144 | /* Is this a short write? */ | |
1145 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1146 | static unsigned long complain; | |
1147 | ||
91d5b470 CL |
1148 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1149 | ||
1da177e4 LT |
1150 | /* Has the server at least made some progress? */ |
1151 | if (resp->count != 0) { | |
1152 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1153 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1154 | /* Resend from where the server left off */ | |
1155 | argp->offset += resp->count; | |
1156 | argp->pgbase += resp->count; | |
1157 | argp->count -= resp->count; | |
1158 | } else { | |
1159 | /* Resend as a stable write in order to avoid | |
1160 | * headaches in the case of a server crash. | |
1161 | */ | |
1162 | argp->stable = NFS_FILE_SYNC; | |
1163 | } | |
1164 | rpc_restart_call(task); | |
788e7a89 | 1165 | return -EAGAIN; |
1da177e4 LT |
1166 | } |
1167 | if (time_before(complain, jiffies)) { | |
1168 | printk(KERN_WARNING | |
1169 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1170 | argp->count); | |
1171 | complain = jiffies + 300 * HZ; | |
1172 | } | |
1173 | /* Can't do anything about it except throw an error. */ | |
1174 | task->tk_status = -EIO; | |
1175 | } | |
788e7a89 | 1176 | return 0; |
1da177e4 LT |
1177 | } |
1178 | ||
1179 | ||
1180 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
c9d8f89d | 1181 | void nfs_commitdata_release(void *data) |
1da177e4 | 1182 | { |
383ba719 TM |
1183 | struct nfs_write_data *wdata = data; |
1184 | ||
1185 | put_nfs_open_context(wdata->args.context); | |
1da177e4 LT |
1186 | nfs_commit_free(wdata); |
1187 | } | |
1188 | ||
1189 | /* | |
1190 | * Set up the argument/result storage required for the RPC call. | |
1191 | */ | |
dbae4c73 | 1192 | static int nfs_commit_rpcsetup(struct list_head *head, |
788e7a89 TM |
1193 | struct nfs_write_data *data, |
1194 | int how) | |
1da177e4 | 1195 | { |
84115e1c TM |
1196 | struct nfs_page *first = nfs_list_entry(head->next); |
1197 | struct inode *inode = first->wb_context->path.dentry->d_inode; | |
1198 | int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
3ff7576d | 1199 | int priority = flush_task_priority(how); |
07737691 | 1200 | struct rpc_task *task; |
bdc7f021 TM |
1201 | struct rpc_message msg = { |
1202 | .rpc_argp = &data->args, | |
1203 | .rpc_resp = &data->res, | |
1204 | .rpc_cred = first->wb_context->cred, | |
1205 | }; | |
84115e1c | 1206 | struct rpc_task_setup task_setup_data = { |
07737691 | 1207 | .task = &data->task, |
84115e1c | 1208 | .rpc_client = NFS_CLIENT(inode), |
bdc7f021 | 1209 | .rpc_message = &msg, |
84115e1c TM |
1210 | .callback_ops = &nfs_commit_ops, |
1211 | .callback_data = data, | |
101070ca | 1212 | .workqueue = nfsiod_workqueue, |
84115e1c | 1213 | .flags = flags, |
3ff7576d | 1214 | .priority = priority, |
84115e1c | 1215 | }; |
1da177e4 LT |
1216 | |
1217 | /* Set up the RPC argument and reply structs | |
1218 | * NB: take care not to mess about with data->commit et al. */ | |
1219 | ||
1220 | list_splice_init(head, &data->pages); | |
1da177e4 | 1221 | |
1da177e4 | 1222 | data->inode = inode; |
bdc7f021 | 1223 | data->cred = msg.rpc_cred; |
1da177e4 LT |
1224 | |
1225 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1226 | /* Note: we always request a commit of the entire inode */ |
1227 | data->args.offset = 0; | |
1228 | data->args.count = 0; | |
383ba719 | 1229 | data->args.context = get_nfs_open_context(first->wb_context); |
3da28eb1 | 1230 | data->res.count = 0; |
1da177e4 LT |
1231 | data->res.fattr = &data->fattr; |
1232 | data->res.verf = &data->verf; | |
0e574af1 | 1233 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1234 | |
1235 | /* Set up the initial task struct. */ | |
bdc7f021 | 1236 | NFS_PROTO(inode)->commit_setup(data, &msg); |
1da177e4 | 1237 | |
a3f565b1 | 1238 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); |
bdc7f021 | 1239 | |
07737691 | 1240 | task = rpc_run_task(&task_setup_data); |
dbae4c73 TM |
1241 | if (IS_ERR(task)) |
1242 | return PTR_ERR(task); | |
1243 | rpc_put_task(task); | |
1244 | return 0; | |
1da177e4 LT |
1245 | } |
1246 | ||
1247 | /* | |
1248 | * Commit dirty pages | |
1249 | */ | |
1250 | static int | |
40859d7e | 1251 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1252 | { |
1253 | struct nfs_write_data *data; | |
1254 | struct nfs_page *req; | |
1255 | ||
c9d8f89d | 1256 | data = nfs_commitdata_alloc(); |
1da177e4 LT |
1257 | |
1258 | if (!data) | |
1259 | goto out_bad; | |
1260 | ||
1261 | /* Set up the argument struct */ | |
dbae4c73 | 1262 | return nfs_commit_rpcsetup(head, data, how); |
1da177e4 LT |
1263 | out_bad: |
1264 | while (!list_empty(head)) { | |
1265 | req = nfs_list_entry(head->next); | |
1266 | nfs_list_remove_request(req); | |
1267 | nfs_mark_request_commit(req); | |
83715ad5 | 1268 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 PZ |
1269 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
1270 | BDI_RECLAIMABLE); | |
9fd367f0 | 1271 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
1272 | } |
1273 | return -ENOMEM; | |
1274 | } | |
1275 | ||
1276 | /* | |
1277 | * COMMIT call returned | |
1278 | */ | |
788e7a89 | 1279 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1280 | { |
963d8fe5 | 1281 | struct nfs_write_data *data = calldata; |
1da177e4 | 1282 | |
a3f565b1 | 1283 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
1da177e4 LT |
1284 | task->tk_pid, task->tk_status); |
1285 | ||
788e7a89 TM |
1286 | /* Call the NFS version-specific code */ |
1287 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1288 | return; | |
c9d8f89d TM |
1289 | } |
1290 | ||
1291 | static void nfs_commit_release(void *calldata) | |
1292 | { | |
1293 | struct nfs_write_data *data = calldata; | |
1294 | struct nfs_page *req; | |
1295 | int status = data->task.tk_status; | |
788e7a89 | 1296 | |
1da177e4 LT |
1297 | while (!list_empty(&data->pages)) { |
1298 | req = nfs_list_entry(data->pages.next); | |
1299 | nfs_list_remove_request(req); | |
612c9384 | 1300 | clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
fd39fc85 | 1301 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 PZ |
1302 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
1303 | BDI_RECLAIMABLE); | |
1da177e4 LT |
1304 | |
1305 | dprintk("NFS: commit (%s/%Ld %d@%Ld)", | |
88be9f99 TM |
1306 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1307 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1308 | req->wb_bytes, |
1309 | (long long)req_offset(req)); | |
c9d8f89d TM |
1310 | if (status < 0) { |
1311 | nfs_context_set_write_error(req->wb_context, status); | |
1da177e4 | 1312 | nfs_inode_remove_request(req); |
c9d8f89d | 1313 | dprintk(", error = %d\n", status); |
1da177e4 LT |
1314 | goto next; |
1315 | } | |
1316 | ||
1317 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1318 | * returned by the server against all stored verfs. */ | |
1319 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1320 | /* We have a match */ | |
44dd151d TM |
1321 | /* Set the PG_uptodate flag */ |
1322 | nfs_mark_uptodate(req->wb_page, req->wb_pgbase, | |
1323 | req->wb_bytes); | |
1da177e4 LT |
1324 | nfs_inode_remove_request(req); |
1325 | dprintk(" OK\n"); | |
1326 | goto next; | |
1327 | } | |
1328 | /* We have a mismatch. Write the page again */ | |
1329 | dprintk(" mismatch\n"); | |
6d884e8f | 1330 | nfs_mark_request_dirty(req); |
1da177e4 | 1331 | next: |
9fd367f0 | 1332 | nfs_clear_page_tag_locked(req); |
1da177e4 | 1333 | } |
c9d8f89d | 1334 | nfs_commitdata_release(calldata); |
1da177e4 | 1335 | } |
788e7a89 TM |
1336 | |
1337 | static const struct rpc_call_ops nfs_commit_ops = { | |
1338 | .rpc_call_done = nfs_commit_done, | |
1339 | .rpc_release = nfs_commit_release, | |
1340 | }; | |
1da177e4 | 1341 | |
3da28eb1 | 1342 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 | 1343 | { |
1da177e4 | 1344 | LIST_HEAD(head); |
7d46a49f | 1345 | int res; |
1da177e4 | 1346 | |
587142f8 | 1347 | spin_lock(&inode->i_lock); |
3da28eb1 | 1348 | res = nfs_scan_commit(inode, &head, 0, 0); |
587142f8 | 1349 | spin_unlock(&inode->i_lock); |
1da177e4 | 1350 | if (res) { |
7d46a49f | 1351 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1352 | if (error < 0) |
1353 | return error; | |
1354 | } | |
1da177e4 LT |
1355 | return res; |
1356 | } | |
c63c7b05 TM |
1357 | #else |
1358 | static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) | |
1359 | { | |
1360 | return 0; | |
1361 | } | |
1da177e4 LT |
1362 | #endif |
1363 | ||
1c75950b | 1364 | long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1365 | { |
1c75950b | 1366 | struct inode *inode = mapping->host; |
ca52fec1 | 1367 | pgoff_t idx_start, idx_end; |
1c75950b | 1368 | unsigned int npages = 0; |
c42de9dd | 1369 | LIST_HEAD(head); |
70b9ecbd | 1370 | int nocommit = how & FLUSH_NOCOMMIT; |
3f442547 | 1371 | long pages, ret; |
1da177e4 | 1372 | |
1c75950b TM |
1373 | /* FIXME */ |
1374 | if (wbc->range_cyclic) | |
1375 | idx_start = 0; | |
1376 | else { | |
1377 | idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1378 | idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1379 | if (idx_end > idx_start) { | |
ca52fec1 | 1380 | pgoff_t l_npages = 1 + idx_end - idx_start; |
1c75950b TM |
1381 | npages = l_npages; |
1382 | if (sizeof(npages) != sizeof(l_npages) && | |
ca52fec1 | 1383 | (pgoff_t)npages != l_npages) |
1c75950b TM |
1384 | npages = 0; |
1385 | } | |
1386 | } | |
c42de9dd | 1387 | how &= ~FLUSH_NOCOMMIT; |
587142f8 | 1388 | spin_lock(&inode->i_lock); |
1da177e4 | 1389 | do { |
c42de9dd TM |
1390 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); |
1391 | if (ret != 0) | |
70b9ecbd | 1392 | continue; |
c42de9dd TM |
1393 | if (nocommit) |
1394 | break; | |
d2ccddf0 | 1395 | pages = nfs_scan_commit(inode, &head, idx_start, npages); |
724c439c | 1396 | if (pages == 0) |
c42de9dd | 1397 | break; |
d2ccddf0 | 1398 | if (how & FLUSH_INVALIDATE) { |
587142f8 | 1399 | spin_unlock(&inode->i_lock); |
83715ad5 | 1400 | nfs_cancel_commit_list(&head); |
e8e058e8 | 1401 | ret = pages; |
587142f8 | 1402 | spin_lock(&inode->i_lock); |
d2ccddf0 TM |
1403 | continue; |
1404 | } | |
1405 | pages += nfs_scan_commit(inode, &head, 0, 0); | |
587142f8 | 1406 | spin_unlock(&inode->i_lock); |
c42de9dd | 1407 | ret = nfs_commit_list(inode, &head, how); |
587142f8 TM |
1408 | spin_lock(&inode->i_lock); |
1409 | ||
c42de9dd | 1410 | } while (ret >= 0); |
587142f8 | 1411 | spin_unlock(&inode->i_lock); |
c42de9dd | 1412 | return ret; |
1da177e4 LT |
1413 | } |
1414 | ||
34901f70 | 1415 | static int __nfs_write_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) |
1c75950b | 1416 | { |
1c75950b TM |
1417 | int ret; |
1418 | ||
34901f70 | 1419 | ret = nfs_writepages(mapping, wbc); |
61822ab5 TM |
1420 | if (ret < 0) |
1421 | goto out; | |
34901f70 | 1422 | ret = nfs_sync_mapping_wait(mapping, wbc, how); |
ed90ef51 TM |
1423 | if (ret < 0) |
1424 | goto out; | |
1425 | return 0; | |
61822ab5 | 1426 | out: |
e507d9eb | 1427 | __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); |
1c75950b TM |
1428 | return ret; |
1429 | } | |
1430 | ||
34901f70 TM |
1431 | /* Two pass sync: first using WB_SYNC_NONE, then WB_SYNC_ALL */ |
1432 | static int nfs_write_mapping(struct address_space *mapping, int how) | |
1433 | { | |
1434 | struct writeback_control wbc = { | |
1435 | .bdi = mapping->backing_dev_info, | |
1436 | .sync_mode = WB_SYNC_NONE, | |
1437 | .nr_to_write = LONG_MAX, | |
1438 | .for_writepages = 1, | |
1439 | .range_cyclic = 1, | |
1440 | }; | |
1441 | int ret; | |
1442 | ||
1443 | ret = __nfs_write_mapping(mapping, &wbc, how); | |
1444 | if (ret < 0) | |
1445 | return ret; | |
1446 | wbc.sync_mode = WB_SYNC_ALL; | |
1447 | return __nfs_write_mapping(mapping, &wbc, how); | |
1448 | } | |
1449 | ||
ed90ef51 TM |
1450 | /* |
1451 | * flush the inode to disk. | |
1452 | */ | |
1453 | int nfs_wb_all(struct inode *inode) | |
1c75950b | 1454 | { |
ed90ef51 TM |
1455 | return nfs_write_mapping(inode->i_mapping, 0); |
1456 | } | |
1c75950b | 1457 | |
ed90ef51 TM |
1458 | int nfs_wb_nocommit(struct inode *inode) |
1459 | { | |
1460 | return nfs_write_mapping(inode->i_mapping, FLUSH_NOCOMMIT); | |
1c75950b TM |
1461 | } |
1462 | ||
1b3b4a1a TM |
1463 | int nfs_wb_page_cancel(struct inode *inode, struct page *page) |
1464 | { | |
1465 | struct nfs_page *req; | |
1466 | loff_t range_start = page_offset(page); | |
1467 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
1468 | struct writeback_control wbc = { | |
1469 | .bdi = page->mapping->backing_dev_info, | |
1470 | .sync_mode = WB_SYNC_ALL, | |
1471 | .nr_to_write = LONG_MAX, | |
1472 | .range_start = range_start, | |
1473 | .range_end = range_end, | |
1474 | }; | |
1475 | int ret = 0; | |
1476 | ||
1477 | BUG_ON(!PageLocked(page)); | |
1478 | for (;;) { | |
1479 | req = nfs_page_find_request(page); | |
1480 | if (req == NULL) | |
1481 | goto out; | |
1482 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
1483 | nfs_release_request(req); | |
1484 | break; | |
1485 | } | |
1486 | if (nfs_lock_request_dontget(req)) { | |
1487 | nfs_inode_remove_request(req); | |
1488 | /* | |
1489 | * In case nfs_inode_remove_request has marked the | |
1490 | * page as being dirty | |
1491 | */ | |
1492 | cancel_dirty_page(page, PAGE_CACHE_SIZE); | |
1493 | nfs_unlock_request(req); | |
1494 | break; | |
1495 | } | |
1496 | ret = nfs_wait_on_request(req); | |
1497 | if (ret < 0) | |
1498 | goto out; | |
1499 | } | |
1500 | if (!PagePrivate(page)) | |
1501 | return 0; | |
1502 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, FLUSH_INVALIDATE); | |
1503 | out: | |
1504 | return ret; | |
1505 | } | |
1506 | ||
5334eb13 AB |
1507 | static int nfs_wb_page_priority(struct inode *inode, struct page *page, |
1508 | int how) | |
1c75950b TM |
1509 | { |
1510 | loff_t range_start = page_offset(page); | |
1511 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
4d770ccf TM |
1512 | struct writeback_control wbc = { |
1513 | .bdi = page->mapping->backing_dev_info, | |
1514 | .sync_mode = WB_SYNC_ALL, | |
1515 | .nr_to_write = LONG_MAX, | |
1516 | .range_start = range_start, | |
1517 | .range_end = range_end, | |
1518 | }; | |
1519 | int ret; | |
1c75950b | 1520 | |
73e3302f TM |
1521 | do { |
1522 | if (clear_page_dirty_for_io(page)) { | |
1523 | ret = nfs_writepage_locked(page, &wbc); | |
1524 | if (ret < 0) | |
1525 | goto out_error; | |
1526 | } else if (!PagePrivate(page)) | |
1527 | break; | |
1528 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); | |
4d770ccf | 1529 | if (ret < 0) |
73e3302f TM |
1530 | goto out_error; |
1531 | } while (PagePrivate(page)); | |
1532 | return 0; | |
1533 | out_error: | |
e507d9eb | 1534 | __mark_inode_dirty(inode, I_DIRTY_PAGES); |
4d770ccf | 1535 | return ret; |
1c75950b TM |
1536 | } |
1537 | ||
1538 | /* | |
1539 | * Write back all requests on one page - we do this before reading it. | |
1540 | */ | |
1541 | int nfs_wb_page(struct inode *inode, struct page* page) | |
1542 | { | |
4d770ccf | 1543 | return nfs_wb_page_priority(inode, page, FLUSH_STABLE); |
1c75950b TM |
1544 | } |
1545 | ||
f7b422b1 | 1546 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1547 | { |
1548 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1549 | sizeof(struct nfs_write_data), | |
1550 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1551 | NULL); |
1da177e4 LT |
1552 | if (nfs_wdata_cachep == NULL) |
1553 | return -ENOMEM; | |
1554 | ||
93d2341c MD |
1555 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1556 | nfs_wdata_cachep); | |
1da177e4 LT |
1557 | if (nfs_wdata_mempool == NULL) |
1558 | return -ENOMEM; | |
1559 | ||
93d2341c MD |
1560 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1561 | nfs_wdata_cachep); | |
1da177e4 LT |
1562 | if (nfs_commit_mempool == NULL) |
1563 | return -ENOMEM; | |
1564 | ||
89a09141 PZ |
1565 | /* |
1566 | * NFS congestion size, scale with available memory. | |
1567 | * | |
1568 | * 64MB: 8192k | |
1569 | * 128MB: 11585k | |
1570 | * 256MB: 16384k | |
1571 | * 512MB: 23170k | |
1572 | * 1GB: 32768k | |
1573 | * 2GB: 46340k | |
1574 | * 4GB: 65536k | |
1575 | * 8GB: 92681k | |
1576 | * 16GB: 131072k | |
1577 | * | |
1578 | * This allows larger machines to have larger/more transfers. | |
1579 | * Limit the default to 256M | |
1580 | */ | |
1581 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); | |
1582 | if (nfs_congestion_kb > 256*1024) | |
1583 | nfs_congestion_kb = 256*1024; | |
1584 | ||
1da177e4 LT |
1585 | return 0; |
1586 | } | |
1587 | ||
266bee88 | 1588 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1589 | { |
1590 | mempool_destroy(nfs_commit_mempool); | |
1591 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1592 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1593 | } |
1594 |