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 | ||
e9f7bee1 | 51 | struct nfs_write_data *nfs_commit_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 | ||
10afec90 | 62 | static void nfs_commit_rcu_free(struct rcu_head *head) |
1da177e4 | 63 | { |
8aca67f0 | 64 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
40859d7e CL |
65 | if (p && (p->pagevec != &p->page_array[0])) |
66 | kfree(p->pagevec); | |
1da177e4 LT |
67 | mempool_free(p, nfs_commit_mempool); |
68 | } | |
69 | ||
8aca67f0 TM |
70 | void nfs_commit_free(struct nfs_write_data *wdata) |
71 | { | |
72 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_commit_rcu_free); | |
73 | } | |
74 | ||
8d5658c9 | 75 | struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount) |
3feb2d49 | 76 | { |
e6b4f8da | 77 | struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS); |
3feb2d49 TM |
78 | |
79 | if (p) { | |
80 | memset(p, 0, sizeof(*p)); | |
81 | INIT_LIST_HEAD(&p->pages); | |
e9f7bee1 | 82 | p->npages = pagecount; |
0d0b5cb3 CL |
83 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
84 | p->pagevec = p->page_array; | |
3feb2d49 | 85 | else { |
0d0b5cb3 CL |
86 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
87 | if (!p->pagevec) { | |
3feb2d49 TM |
88 | mempool_free(p, nfs_wdata_mempool); |
89 | p = NULL; | |
90 | } | |
91 | } | |
92 | } | |
93 | return p; | |
94 | } | |
95 | ||
8aca67f0 | 96 | static void nfs_writedata_rcu_free(struct rcu_head *head) |
3feb2d49 | 97 | { |
8aca67f0 | 98 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
3feb2d49 TM |
99 | if (p && (p->pagevec != &p->page_array[0])) |
100 | kfree(p->pagevec); | |
101 | mempool_free(p, nfs_wdata_mempool); | |
102 | } | |
103 | ||
8aca67f0 TM |
104 | static void nfs_writedata_free(struct nfs_write_data *wdata) |
105 | { | |
106 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_writedata_rcu_free); | |
107 | } | |
108 | ||
963d8fe5 | 109 | void nfs_writedata_release(void *wdata) |
1da177e4 | 110 | { |
1da177e4 LT |
111 | nfs_writedata_free(wdata); |
112 | } | |
113 | ||
7b159fc1 TM |
114 | static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error) |
115 | { | |
116 | ctx->error = error; | |
117 | smp_wmb(); | |
118 | set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
119 | } | |
120 | ||
277459d2 TM |
121 | static struct nfs_page *nfs_page_find_request_locked(struct page *page) |
122 | { | |
123 | struct nfs_page *req = NULL; | |
124 | ||
125 | if (PagePrivate(page)) { | |
126 | req = (struct nfs_page *)page_private(page); | |
127 | if (req != NULL) | |
c03b4024 | 128 | kref_get(&req->wb_kref); |
277459d2 TM |
129 | } |
130 | return req; | |
131 | } | |
132 | ||
133 | static struct nfs_page *nfs_page_find_request(struct page *page) | |
134 | { | |
587142f8 | 135 | struct inode *inode = page->mapping->host; |
277459d2 | 136 | struct nfs_page *req = NULL; |
277459d2 | 137 | |
587142f8 | 138 | spin_lock(&inode->i_lock); |
277459d2 | 139 | req = nfs_page_find_request_locked(page); |
587142f8 | 140 | spin_unlock(&inode->i_lock); |
277459d2 TM |
141 | return req; |
142 | } | |
143 | ||
1da177e4 LT |
144 | /* Adjust the file length if we're writing beyond the end */ |
145 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) | |
146 | { | |
147 | struct inode *inode = page->mapping->host; | |
148 | loff_t end, i_size = i_size_read(inode); | |
ca52fec1 | 149 | pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; |
1da177e4 LT |
150 | |
151 | if (i_size > 0 && page->index < end_index) | |
152 | return; | |
153 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); | |
154 | if (i_size >= end) | |
155 | return; | |
91d5b470 | 156 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
1da177e4 LT |
157 | i_size_write(inode, end); |
158 | } | |
159 | ||
a301b777 TM |
160 | /* A writeback failed: mark the page as bad, and invalidate the page cache */ |
161 | static void nfs_set_pageerror(struct page *page) | |
162 | { | |
163 | SetPageError(page); | |
164 | nfs_zap_mapping(page->mapping->host, page->mapping); | |
165 | } | |
166 | ||
1da177e4 LT |
167 | /* We can set the PG_uptodate flag if we see that a write request |
168 | * covers the full page. | |
169 | */ | |
170 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) | |
171 | { | |
1da177e4 LT |
172 | if (PageUptodate(page)) |
173 | return; | |
174 | if (base != 0) | |
175 | return; | |
49a70f27 | 176 | if (count != nfs_page_length(page)) |
1da177e4 | 177 | return; |
49a70f27 | 178 | SetPageUptodate(page); |
1da177e4 LT |
179 | } |
180 | ||
e21195a7 | 181 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
1da177e4 LT |
182 | unsigned int offset, unsigned int count) |
183 | { | |
184 | struct nfs_page *req; | |
e21195a7 | 185 | int ret; |
1da177e4 | 186 | |
e21195a7 TM |
187 | for (;;) { |
188 | req = nfs_update_request(ctx, page, offset, count); | |
189 | if (!IS_ERR(req)) | |
190 | break; | |
191 | ret = PTR_ERR(req); | |
192 | if (ret != -EBUSY) | |
193 | return ret; | |
194 | ret = nfs_wb_page(page->mapping->host, page); | |
195 | if (ret != 0) | |
196 | return ret; | |
197 | } | |
1da177e4 LT |
198 | /* Update file length */ |
199 | nfs_grow_file(page, offset, count); | |
acee478a | 200 | nfs_clear_page_tag_locked(req); |
abd3e641 | 201 | return 0; |
1da177e4 LT |
202 | } |
203 | ||
204 | static int wb_priority(struct writeback_control *wbc) | |
205 | { | |
206 | if (wbc->for_reclaim) | |
c63c7b05 | 207 | return FLUSH_HIGHPRI | FLUSH_STABLE; |
1da177e4 LT |
208 | if (wbc->for_kupdate) |
209 | return FLUSH_LOWPRI; | |
210 | return 0; | |
211 | } | |
212 | ||
89a09141 PZ |
213 | /* |
214 | * NFS congestion control | |
215 | */ | |
216 | ||
217 | int nfs_congestion_kb; | |
218 | ||
219 | #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) | |
220 | #define NFS_CONGESTION_OFF_THRESH \ | |
221 | (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) | |
222 | ||
5a6d41b3 | 223 | static int nfs_set_page_writeback(struct page *page) |
89a09141 | 224 | { |
5a6d41b3 TM |
225 | int ret = test_set_page_writeback(page); |
226 | ||
227 | if (!ret) { | |
89a09141 PZ |
228 | struct inode *inode = page->mapping->host; |
229 | struct nfs_server *nfss = NFS_SERVER(inode); | |
230 | ||
277866a0 | 231 | if (atomic_long_inc_return(&nfss->writeback) > |
89a09141 PZ |
232 | NFS_CONGESTION_ON_THRESH) |
233 | set_bdi_congested(&nfss->backing_dev_info, WRITE); | |
234 | } | |
5a6d41b3 | 235 | return ret; |
89a09141 PZ |
236 | } |
237 | ||
238 | static void nfs_end_page_writeback(struct page *page) | |
239 | { | |
240 | struct inode *inode = page->mapping->host; | |
241 | struct nfs_server *nfss = NFS_SERVER(inode); | |
242 | ||
243 | end_page_writeback(page); | |
c4dc4bee | 244 | if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) |
89a09141 | 245 | clear_bdi_congested(&nfss->backing_dev_info, WRITE); |
89a09141 PZ |
246 | } |
247 | ||
e261f51f TM |
248 | /* |
249 | * Find an associated nfs write request, and prepare to flush it out | |
9cccef95 | 250 | * May return an error if the user signalled nfs_wait_on_request(). |
e261f51f | 251 | */ |
c63c7b05 TM |
252 | static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, |
253 | struct page *page) | |
e261f51f | 254 | { |
587142f8 | 255 | struct inode *inode = page->mapping->host; |
e261f51f | 256 | struct nfs_page *req; |
e261f51f TM |
257 | int ret; |
258 | ||
587142f8 | 259 | spin_lock(&inode->i_lock); |
e261f51f TM |
260 | for(;;) { |
261 | req = nfs_page_find_request_locked(page); | |
262 | if (req == NULL) { | |
587142f8 | 263 | spin_unlock(&inode->i_lock); |
9cccef95 | 264 | return 0; |
e261f51f | 265 | } |
acee478a | 266 | if (nfs_set_page_tag_locked(req)) |
e261f51f TM |
267 | break; |
268 | /* Note: If we hold the page lock, as is the case in nfs_writepage, | |
acee478a | 269 | * then the call to nfs_set_page_tag_locked() will always |
e261f51f TM |
270 | * succeed provided that someone hasn't already marked the |
271 | * request as dirty (in which case we don't care). | |
272 | */ | |
587142f8 | 273 | spin_unlock(&inode->i_lock); |
e261f51f TM |
274 | ret = nfs_wait_on_request(req); |
275 | nfs_release_request(req); | |
276 | if (ret != 0) | |
277 | return ret; | |
587142f8 | 278 | spin_lock(&inode->i_lock); |
e261f51f | 279 | } |
612c9384 TM |
280 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
281 | /* This request is marked for commit */ | |
587142f8 | 282 | spin_unlock(&inode->i_lock); |
acee478a | 283 | nfs_clear_page_tag_locked(req); |
c63c7b05 | 284 | nfs_pageio_complete(pgio); |
9cccef95 | 285 | return 0; |
612c9384 | 286 | } |
c63c7b05 | 287 | if (nfs_set_page_writeback(page) != 0) { |
587142f8 | 288 | spin_unlock(&inode->i_lock); |
c63c7b05 TM |
289 | BUG(); |
290 | } | |
587142f8 | 291 | spin_unlock(&inode->i_lock); |
f8512ad0 FI |
292 | if (!nfs_pageio_add_request(pgio, req)) { |
293 | nfs_redirty_request(req); | |
294 | nfs_end_page_writeback(page); | |
295 | nfs_clear_page_tag_locked(req); | |
296 | return pgio->pg_error; | |
297 | } | |
9cccef95 | 298 | return 0; |
e261f51f TM |
299 | } |
300 | ||
f758c885 | 301 | static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) |
1da177e4 | 302 | { |
1da177e4 | 303 | struct inode *inode = page->mapping->host; |
1da177e4 | 304 | |
91d5b470 CL |
305 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
306 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
307 | ||
7fe7f848 | 308 | nfs_pageio_cond_complete(pgio, page->index); |
f758c885 TM |
309 | return nfs_page_async_flush(pgio, page); |
310 | } | |
7fe7f848 | 311 | |
f758c885 TM |
312 | /* |
313 | * Write an mmapped page to the server. | |
314 | */ | |
315 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
316 | { | |
317 | struct nfs_pageio_descriptor pgio; | |
318 | int err; | |
49a70f27 | 319 | |
f758c885 TM |
320 | nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc)); |
321 | err = nfs_do_writepage(page, wbc, &pgio); | |
322 | nfs_pageio_complete(&pgio); | |
323 | if (err < 0) | |
324 | return err; | |
325 | if (pgio.pg_error < 0) | |
326 | return pgio.pg_error; | |
327 | return 0; | |
4d770ccf TM |
328 | } |
329 | ||
330 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
331 | { | |
f758c885 | 332 | int ret; |
4d770ccf | 333 | |
f758c885 | 334 | ret = nfs_writepage_locked(page, wbc); |
1da177e4 | 335 | unlock_page(page); |
f758c885 TM |
336 | return ret; |
337 | } | |
338 | ||
339 | static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) | |
340 | { | |
341 | int ret; | |
342 | ||
343 | ret = nfs_do_writepage(page, wbc, data); | |
344 | unlock_page(page); | |
345 | return ret; | |
1da177e4 LT |
346 | } |
347 | ||
1da177e4 LT |
348 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) |
349 | { | |
1da177e4 | 350 | struct inode *inode = mapping->host; |
c63c7b05 | 351 | struct nfs_pageio_descriptor pgio; |
1da177e4 LT |
352 | int 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); |
f758c885 | 359 | if (err < 0) |
1da177e4 | 360 | return err; |
f758c885 | 361 | if (pgio.pg_error < 0) |
c63c7b05 TM |
362 | return pgio.pg_error; |
363 | return 0; | |
1da177e4 LT |
364 | } |
365 | ||
366 | /* | |
367 | * Insert a write request into an inode | |
368 | */ | |
369 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) | |
370 | { | |
371 | struct nfs_inode *nfsi = NFS_I(inode); | |
372 | int error; | |
373 | ||
374 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); | |
375 | BUG_ON(error == -EEXIST); | |
376 | if (error) | |
377 | return error; | |
378 | if (!nfsi->npages) { | |
379 | igrab(inode); | |
1da177e4 LT |
380 | if (nfs_have_delegation(inode, FMODE_WRITE)) |
381 | nfsi->change_attr++; | |
382 | } | |
deb7d638 | 383 | SetPagePrivate(req->wb_page); |
277459d2 | 384 | set_page_private(req->wb_page, (unsigned long)req); |
1da177e4 | 385 | nfsi->npages++; |
c03b4024 | 386 | kref_get(&req->wb_kref); |
acee478a | 387 | radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, NFS_PAGE_TAG_LOCKED); |
1da177e4 LT |
388 | return 0; |
389 | } | |
390 | ||
391 | /* | |
89a09141 | 392 | * Remove a write request from an inode |
1da177e4 LT |
393 | */ |
394 | static void nfs_inode_remove_request(struct nfs_page *req) | |
395 | { | |
88be9f99 | 396 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
397 | struct nfs_inode *nfsi = NFS_I(inode); |
398 | ||
399 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
400 | ||
587142f8 | 401 | spin_lock(&inode->i_lock); |
277459d2 | 402 | set_page_private(req->wb_page, 0); |
deb7d638 | 403 | ClearPagePrivate(req->wb_page); |
1da177e4 LT |
404 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
405 | nfsi->npages--; | |
406 | if (!nfsi->npages) { | |
587142f8 | 407 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
408 | iput(inode); |
409 | } else | |
587142f8 | 410 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
411 | nfs_clear_request(req); |
412 | nfs_release_request(req); | |
413 | } | |
414 | ||
61822ab5 TM |
415 | static void |
416 | nfs_redirty_request(struct nfs_page *req) | |
417 | { | |
61822ab5 TM |
418 | __set_page_dirty_nobuffers(req->wb_page); |
419 | } | |
420 | ||
1da177e4 LT |
421 | /* |
422 | * Check if a request is dirty | |
423 | */ | |
424 | static inline int | |
425 | nfs_dirty_request(struct nfs_page *req) | |
426 | { | |
5a6d41b3 TM |
427 | struct page *page = req->wb_page; |
428 | ||
612c9384 | 429 | if (page == NULL || test_bit(PG_NEED_COMMIT, &req->wb_flags)) |
5a6d41b3 TM |
430 | return 0; |
431 | return !PageWriteback(req->wb_page); | |
1da177e4 LT |
432 | } |
433 | ||
434 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
435 | /* | |
436 | * Add a request to the inode's commit list. | |
437 | */ | |
438 | static void | |
439 | nfs_mark_request_commit(struct nfs_page *req) | |
440 | { | |
88be9f99 | 441 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
442 | struct nfs_inode *nfsi = NFS_I(inode); |
443 | ||
587142f8 | 444 | spin_lock(&inode->i_lock); |
1da177e4 | 445 | nfsi->ncommit++; |
612c9384 | 446 | set_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
5c369683 TM |
447 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
448 | req->wb_index, | |
449 | NFS_PAGE_TAG_COMMIT); | |
587142f8 | 450 | spin_unlock(&inode->i_lock); |
fd39fc85 | 451 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 | 452 | inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE); |
a1803044 | 453 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1da177e4 | 454 | } |
8e821cad TM |
455 | |
456 | static inline | |
457 | int nfs_write_need_commit(struct nfs_write_data *data) | |
458 | { | |
459 | return data->verf.committed != NFS_FILE_SYNC; | |
460 | } | |
461 | ||
462 | static inline | |
463 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
464 | { | |
612c9384 | 465 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
8e821cad TM |
466 | nfs_mark_request_commit(req); |
467 | return 1; | |
468 | } | |
469 | if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { | |
470 | nfs_redirty_request(req); | |
471 | return 1; | |
472 | } | |
473 | return 0; | |
474 | } | |
475 | #else | |
476 | static inline void | |
477 | nfs_mark_request_commit(struct nfs_page *req) | |
478 | { | |
479 | } | |
480 | ||
481 | static inline | |
482 | int nfs_write_need_commit(struct nfs_write_data *data) | |
483 | { | |
484 | return 0; | |
485 | } | |
486 | ||
487 | static inline | |
488 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
489 | { | |
490 | return 0; | |
491 | } | |
1da177e4 LT |
492 | #endif |
493 | ||
494 | /* | |
495 | * Wait for a request to complete. | |
496 | * | |
150030b7 | 497 | * Interruptible by fatal signals only. |
1da177e4 | 498 | */ |
ca52fec1 | 499 | static int nfs_wait_on_requests_locked(struct inode *inode, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
500 | { |
501 | struct nfs_inode *nfsi = NFS_I(inode); | |
502 | struct nfs_page *req; | |
ca52fec1 | 503 | pgoff_t idx_end, next; |
1da177e4 LT |
504 | unsigned int res = 0; |
505 | int error; | |
506 | ||
507 | if (npages == 0) | |
508 | idx_end = ~0; | |
509 | else | |
510 | idx_end = idx_start + npages - 1; | |
511 | ||
1da177e4 | 512 | next = idx_start; |
9fd367f0 | 513 | while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_LOCKED)) { |
1da177e4 LT |
514 | if (req->wb_index > idx_end) |
515 | break; | |
516 | ||
517 | next = req->wb_index + 1; | |
c6a556b8 | 518 | BUG_ON(!NFS_WBACK_BUSY(req)); |
1da177e4 | 519 | |
c03b4024 | 520 | kref_get(&req->wb_kref); |
587142f8 | 521 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
522 | error = nfs_wait_on_request(req); |
523 | nfs_release_request(req); | |
587142f8 | 524 | spin_lock(&inode->i_lock); |
1da177e4 LT |
525 | if (error < 0) |
526 | return error; | |
1da177e4 LT |
527 | res++; |
528 | } | |
1da177e4 LT |
529 | return res; |
530 | } | |
531 | ||
83715ad5 TM |
532 | static void nfs_cancel_commit_list(struct list_head *head) |
533 | { | |
534 | struct nfs_page *req; | |
535 | ||
536 | while(!list_empty(head)) { | |
537 | req = nfs_list_entry(head->next); | |
b6dff26a | 538 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 PZ |
539 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
540 | BDI_RECLAIMABLE); | |
83715ad5 | 541 | nfs_list_remove_request(req); |
612c9384 | 542 | clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
83715ad5 | 543 | nfs_inode_remove_request(req); |
b6dff26a | 544 | nfs_unlock_request(req); |
83715ad5 TM |
545 | } |
546 | } | |
547 | ||
1da177e4 LT |
548 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
549 | /* | |
550 | * nfs_scan_commit - Scan an inode for commit requests | |
551 | * @inode: NFS inode to scan | |
552 | * @dst: destination list | |
553 | * @idx_start: lower bound of page->index to scan. | |
554 | * @npages: idx_start + npages sets the upper bound to scan. | |
555 | * | |
556 | * Moves requests from the inode's 'commit' request list. | |
557 | * The requests are *not* checked to ensure that they form a contiguous set. | |
558 | */ | |
559 | static int | |
ca52fec1 | 560 | nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
561 | { |
562 | struct nfs_inode *nfsi = NFS_I(inode); | |
3da28eb1 TM |
563 | int res = 0; |
564 | ||
565 | if (nfsi->ncommit != 0) { | |
5c369683 TM |
566 | res = nfs_scan_list(nfsi, dst, idx_start, npages, |
567 | NFS_PAGE_TAG_COMMIT); | |
3da28eb1 | 568 | nfsi->ncommit -= res; |
3da28eb1 | 569 | } |
1da177e4 LT |
570 | return res; |
571 | } | |
c42de9dd | 572 | #else |
ca52fec1 | 573 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
c42de9dd TM |
574 | { |
575 | return 0; | |
576 | } | |
1da177e4 LT |
577 | #endif |
578 | ||
1da177e4 LT |
579 | /* |
580 | * Try to update any existing write request, or create one if there is none. | |
581 | * In order to match, the request's credentials must match those of | |
582 | * the calling process. | |
583 | * | |
584 | * Note: Should always be called with the Page Lock held! | |
585 | */ | |
586 | static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, | |
e21195a7 | 587 | struct page *page, unsigned int offset, unsigned int bytes) |
1da177e4 | 588 | { |
89a09141 PZ |
589 | struct address_space *mapping = page->mapping; |
590 | struct inode *inode = mapping->host; | |
1da177e4 | 591 | struct nfs_page *req, *new = NULL; |
ca52fec1 | 592 | pgoff_t rqend, end; |
1da177e4 LT |
593 | |
594 | end = offset + bytes; | |
595 | ||
1da177e4 LT |
596 | for (;;) { |
597 | /* Loop over all inode entries and see if we find | |
598 | * A request for the page we wish to update | |
599 | */ | |
587142f8 | 600 | spin_lock(&inode->i_lock); |
277459d2 | 601 | req = nfs_page_find_request_locked(page); |
1da177e4 | 602 | if (req) { |
acee478a | 603 | if (!nfs_set_page_tag_locked(req)) { |
1da177e4 | 604 | int error; |
277459d2 | 605 | |
587142f8 | 606 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
607 | error = nfs_wait_on_request(req); |
608 | nfs_release_request(req); | |
1dd594b2 NB |
609 | if (error < 0) { |
610 | if (new) | |
611 | nfs_release_request(new); | |
1da177e4 | 612 | return ERR_PTR(error); |
1dd594b2 | 613 | } |
1da177e4 LT |
614 | continue; |
615 | } | |
587142f8 | 616 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
617 | if (new) |
618 | nfs_release_request(new); | |
619 | break; | |
620 | } | |
621 | ||
622 | if (new) { | |
623 | int error; | |
624 | nfs_lock_request_dontget(new); | |
625 | error = nfs_inode_add_request(inode, new); | |
626 | if (error) { | |
587142f8 | 627 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
628 | nfs_unlock_request(new); |
629 | return ERR_PTR(error); | |
630 | } | |
587142f8 | 631 | spin_unlock(&inode->i_lock); |
61e930a9 TM |
632 | req = new; |
633 | goto zero_page; | |
1da177e4 | 634 | } |
587142f8 | 635 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
636 | |
637 | new = nfs_create_request(ctx, inode, page, offset, bytes); | |
638 | if (IS_ERR(new)) | |
639 | return new; | |
640 | } | |
641 | ||
642 | /* We have a request for our page. | |
643 | * If the creds don't match, or the | |
644 | * page addresses don't match, | |
645 | * tell the caller to wait on the conflicting | |
646 | * request. | |
647 | */ | |
648 | rqend = req->wb_offset + req->wb_bytes; | |
649 | if (req->wb_context != ctx | |
650 | || req->wb_page != page | |
651 | || !nfs_dirty_request(req) | |
652 | || offset > rqend || end < req->wb_offset) { | |
acee478a | 653 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
654 | return ERR_PTR(-EBUSY); |
655 | } | |
656 | ||
657 | /* Okay, the request matches. Update the region */ | |
658 | if (offset < req->wb_offset) { | |
659 | req->wb_offset = offset; | |
660 | req->wb_pgbase = offset; | |
61e930a9 TM |
661 | req->wb_bytes = max(end, rqend) - req->wb_offset; |
662 | goto zero_page; | |
1da177e4 LT |
663 | } |
664 | ||
665 | if (end > rqend) | |
666 | req->wb_bytes = end - req->wb_offset; | |
667 | ||
668 | return req; | |
61e930a9 TM |
669 | zero_page: |
670 | /* If this page might potentially be marked as up to date, | |
671 | * then we need to zero any uninitalised data. */ | |
672 | if (req->wb_pgbase == 0 && req->wb_bytes != PAGE_CACHE_SIZE | |
673 | && !PageUptodate(req->wb_page)) | |
eebd2aa3 | 674 | zero_user_segment(req->wb_page, req->wb_bytes, PAGE_CACHE_SIZE); |
61e930a9 | 675 | return req; |
1da177e4 LT |
676 | } |
677 | ||
678 | int nfs_flush_incompatible(struct file *file, struct page *page) | |
679 | { | |
cd3758e3 | 680 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 681 | struct nfs_page *req; |
1a54533e | 682 | int do_flush, status; |
1da177e4 LT |
683 | /* |
684 | * Look for a request corresponding to this page. If there | |
685 | * is one, and it belongs to another file, we flush it out | |
686 | * before we try to copy anything into the page. Do this | |
687 | * due to the lack of an ACCESS-type call in NFSv2. | |
688 | * Also do the same if we find a request from an existing | |
689 | * dropped page. | |
690 | */ | |
1a54533e TM |
691 | do { |
692 | req = nfs_page_find_request(page); | |
693 | if (req == NULL) | |
694 | return 0; | |
695 | do_flush = req->wb_page != page || req->wb_context != ctx | |
e261f51f | 696 | || !nfs_dirty_request(req); |
1da177e4 | 697 | nfs_release_request(req); |
1a54533e TM |
698 | if (!do_flush) |
699 | return 0; | |
700 | status = nfs_wb_page(page->mapping->host, page); | |
701 | } while (status == 0); | |
702 | return status; | |
1da177e4 LT |
703 | } |
704 | ||
5d47a356 TM |
705 | /* |
706 | * If the page cache is marked as unsafe or invalid, then we can't rely on | |
707 | * the PageUptodate() flag. In this case, we will need to turn off | |
708 | * write optimisations that depend on the page contents being correct. | |
709 | */ | |
710 | static int nfs_write_pageuptodate(struct page *page, struct inode *inode) | |
711 | { | |
712 | return PageUptodate(page) && | |
713 | !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA)); | |
714 | } | |
715 | ||
1da177e4 LT |
716 | /* |
717 | * Update and possibly write a cached page of an NFS file. | |
718 | * | |
719 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
720 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
721 | */ | |
722 | int nfs_updatepage(struct file *file, struct page *page, | |
723 | unsigned int offset, unsigned int count) | |
724 | { | |
cd3758e3 | 725 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 726 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
727 | int status = 0; |
728 | ||
91d5b470 CL |
729 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
730 | ||
1da177e4 | 731 | dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", |
01cce933 JJS |
732 | file->f_path.dentry->d_parent->d_name.name, |
733 | file->f_path.dentry->d_name.name, count, | |
0bbacc40 | 734 | (long long)(page_offset(page) +offset)); |
1da177e4 | 735 | |
1da177e4 | 736 | /* If we're not using byte range locks, and we know the page |
5d47a356 TM |
737 | * is up to date, it may be more efficient to extend the write |
738 | * to cover the entire page in order to avoid fragmentation | |
739 | * inefficiencies. | |
1da177e4 | 740 | */ |
5d47a356 TM |
741 | if (nfs_write_pageuptodate(page, inode) && |
742 | inode->i_flock == NULL && | |
af1b8c2f | 743 | !(file->f_flags & O_SYNC)) { |
49a70f27 | 744 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 745 | offset = 0; |
1da177e4 LT |
746 | } |
747 | ||
e21195a7 | 748 | status = nfs_writepage_setup(ctx, page, offset, count); |
e261f51f | 749 | __set_page_dirty_nobuffers(page); |
1da177e4 | 750 | |
1da177e4 LT |
751 | dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", |
752 | status, (long long)i_size_read(inode)); | |
753 | if (status < 0) | |
a301b777 | 754 | nfs_set_pageerror(page); |
1da177e4 LT |
755 | return status; |
756 | } | |
757 | ||
758 | static void nfs_writepage_release(struct nfs_page *req) | |
759 | { | |
1da177e4 | 760 | |
44dd151d TM |
761 | if (PageError(req->wb_page)) { |
762 | nfs_end_page_writeback(req->wb_page); | |
763 | nfs_inode_remove_request(req); | |
764 | } else if (!nfs_reschedule_unstable_write(req)) { | |
765 | /* Set the PG_uptodate flag */ | |
766 | nfs_mark_uptodate(req->wb_page, req->wb_pgbase, req->wb_bytes); | |
8e821cad TM |
767 | nfs_end_page_writeback(req->wb_page); |
768 | nfs_inode_remove_request(req); | |
769 | } else | |
770 | nfs_end_page_writeback(req->wb_page); | |
9fd367f0 | 771 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
772 | } |
773 | ||
3ff7576d | 774 | static int flush_task_priority(int how) |
1da177e4 LT |
775 | { |
776 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
777 | case FLUSH_HIGHPRI: | |
778 | return RPC_PRIORITY_HIGH; | |
779 | case FLUSH_LOWPRI: | |
780 | return RPC_PRIORITY_LOW; | |
781 | } | |
782 | return RPC_PRIORITY_NORMAL; | |
783 | } | |
784 | ||
785 | /* | |
786 | * Set up the argument/result storage required for the RPC call. | |
787 | */ | |
788 | static void nfs_write_rpcsetup(struct nfs_page *req, | |
789 | struct nfs_write_data *data, | |
788e7a89 | 790 | const struct rpc_call_ops *call_ops, |
1da177e4 LT |
791 | unsigned int count, unsigned int offset, |
792 | int how) | |
793 | { | |
84115e1c TM |
794 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
795 | int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
3ff7576d | 796 | int priority = flush_task_priority(how); |
07737691 | 797 | struct rpc_task *task; |
bdc7f021 TM |
798 | struct rpc_message msg = { |
799 | .rpc_argp = &data->args, | |
800 | .rpc_resp = &data->res, | |
801 | .rpc_cred = req->wb_context->cred, | |
802 | }; | |
84115e1c TM |
803 | struct rpc_task_setup task_setup_data = { |
804 | .rpc_client = NFS_CLIENT(inode), | |
07737691 | 805 | .task = &data->task, |
bdc7f021 | 806 | .rpc_message = &msg, |
84115e1c TM |
807 | .callback_ops = call_ops, |
808 | .callback_data = data, | |
809 | .flags = flags, | |
3ff7576d | 810 | .priority = priority, |
84115e1c | 811 | }; |
1da177e4 LT |
812 | |
813 | /* Set up the RPC argument and reply structs | |
814 | * NB: take care not to mess about with data->commit et al. */ | |
815 | ||
816 | data->req = req; | |
88be9f99 | 817 | data->inode = inode = req->wb_context->path.dentry->d_inode; |
bdc7f021 | 818 | data->cred = msg.rpc_cred; |
1da177e4 LT |
819 | |
820 | data->args.fh = NFS_FH(inode); | |
821 | data->args.offset = req_offset(req) + offset; | |
822 | data->args.pgbase = req->wb_pgbase + offset; | |
823 | data->args.pages = data->pagevec; | |
824 | data->args.count = count; | |
825 | data->args.context = req->wb_context; | |
bdc7f021 TM |
826 | data->args.stable = NFS_UNSTABLE; |
827 | if (how & FLUSH_STABLE) { | |
828 | data->args.stable = NFS_DATA_SYNC; | |
829 | if (!NFS_I(inode)->ncommit) | |
830 | data->args.stable = NFS_FILE_SYNC; | |
831 | } | |
1da177e4 LT |
832 | |
833 | data->res.fattr = &data->fattr; | |
834 | data->res.count = count; | |
835 | data->res.verf = &data->verf; | |
0e574af1 | 836 | nfs_fattr_init(&data->fattr); |
1da177e4 | 837 | |
788e7a89 | 838 | /* Set up the initial task struct. */ |
bdc7f021 | 839 | NFS_PROTO(inode)->write_setup(data, &msg); |
1da177e4 | 840 | |
a3f565b1 CL |
841 | dprintk("NFS: %5u initiated write call " |
842 | "(req %s/%Ld, %u bytes @ offset %Lu)\n", | |
0bbacc40 | 843 | data->task.tk_pid, |
1da177e4 LT |
844 | inode->i_sb->s_id, |
845 | (long long)NFS_FILEID(inode), | |
846 | count, | |
847 | (unsigned long long)data->args.offset); | |
1da177e4 | 848 | |
07737691 TM |
849 | task = rpc_run_task(&task_setup_data); |
850 | if (!IS_ERR(task)) | |
851 | rpc_put_task(task); | |
1da177e4 LT |
852 | } |
853 | ||
854 | /* | |
855 | * Generate multiple small requests to write out a single | |
856 | * contiguous dirty area on one page. | |
857 | */ | |
8d5658c9 | 858 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
859 | { |
860 | struct nfs_page *req = nfs_list_entry(head->next); | |
861 | struct page *page = req->wb_page; | |
862 | struct nfs_write_data *data; | |
e9f7bee1 TM |
863 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
864 | unsigned int offset; | |
1da177e4 LT |
865 | int requests = 0; |
866 | LIST_HEAD(list); | |
867 | ||
868 | nfs_list_remove_request(req); | |
869 | ||
bcb71bba | 870 | nbytes = count; |
e9f7bee1 TM |
871 | do { |
872 | size_t len = min(nbytes, wsize); | |
873 | ||
8d5658c9 | 874 | data = nfs_writedata_alloc(1); |
1da177e4 LT |
875 | if (!data) |
876 | goto out_bad; | |
877 | list_add(&data->pages, &list); | |
878 | requests++; | |
e9f7bee1 TM |
879 | nbytes -= len; |
880 | } while (nbytes != 0); | |
1da177e4 LT |
881 | atomic_set(&req->wb_complete, requests); |
882 | ||
883 | ClearPageError(page); | |
1da177e4 | 884 | offset = 0; |
bcb71bba | 885 | nbytes = count; |
1da177e4 LT |
886 | do { |
887 | data = list_entry(list.next, struct nfs_write_data, pages); | |
888 | list_del_init(&data->pages); | |
889 | ||
890 | data->pagevec[0] = page; | |
1da177e4 | 891 | |
bcb71bba TM |
892 | if (nbytes < wsize) |
893 | wsize = nbytes; | |
894 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, | |
895 | wsize, offset, how); | |
896 | offset += wsize; | |
897 | nbytes -= wsize; | |
1da177e4 LT |
898 | } while (nbytes != 0); |
899 | ||
900 | return 0; | |
901 | ||
902 | out_bad: | |
903 | while (!list_empty(&list)) { | |
904 | data = list_entry(list.next, struct nfs_write_data, pages); | |
905 | list_del(&data->pages); | |
8aca67f0 | 906 | nfs_writedata_release(data); |
1da177e4 | 907 | } |
61822ab5 | 908 | nfs_redirty_request(req); |
6d677e35 | 909 | nfs_end_page_writeback(req->wb_page); |
9fd367f0 | 910 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
911 | return -ENOMEM; |
912 | } | |
913 | ||
914 | /* | |
915 | * Create an RPC task for the given write request and kick it. | |
916 | * The page must have been locked by the caller. | |
917 | * | |
918 | * It may happen that the page we're passed is not marked dirty. | |
919 | * This is the case if nfs_updatepage detects a conflicting request | |
920 | * that has been written but not committed. | |
921 | */ | |
8d5658c9 | 922 | static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
923 | { |
924 | struct nfs_page *req; | |
925 | struct page **pages; | |
926 | struct nfs_write_data *data; | |
1da177e4 | 927 | |
8d5658c9 | 928 | data = nfs_writedata_alloc(npages); |
1da177e4 LT |
929 | if (!data) |
930 | goto out_bad; | |
931 | ||
932 | pages = data->pagevec; | |
1da177e4 LT |
933 | while (!list_empty(head)) { |
934 | req = nfs_list_entry(head->next); | |
935 | nfs_list_remove_request(req); | |
936 | nfs_list_add_request(req, &data->pages); | |
937 | ClearPageError(req->wb_page); | |
1da177e4 | 938 | *pages++ = req->wb_page; |
1da177e4 LT |
939 | } |
940 | req = nfs_list_entry(data->pages.next); | |
941 | ||
1da177e4 | 942 | /* Set up the argument struct */ |
788e7a89 | 943 | nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 | 944 | |
1da177e4 LT |
945 | return 0; |
946 | out_bad: | |
947 | while (!list_empty(head)) { | |
10afec90 | 948 | req = nfs_list_entry(head->next); |
1da177e4 | 949 | nfs_list_remove_request(req); |
61822ab5 | 950 | nfs_redirty_request(req); |
6d677e35 | 951 | nfs_end_page_writeback(req->wb_page); |
9fd367f0 | 952 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
953 | } |
954 | return -ENOMEM; | |
955 | } | |
956 | ||
c63c7b05 TM |
957 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, |
958 | struct inode *inode, int ioflags) | |
1da177e4 | 959 | { |
bf4285e7 | 960 | size_t wsize = NFS_SERVER(inode)->wsize; |
1da177e4 | 961 | |
bcb71bba | 962 | if (wsize < PAGE_CACHE_SIZE) |
c63c7b05 | 963 | nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); |
bcb71bba | 964 | else |
c63c7b05 | 965 | nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); |
1da177e4 LT |
966 | } |
967 | ||
968 | /* | |
969 | * Handle a write reply that flushed part of a page. | |
970 | */ | |
788e7a89 | 971 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 972 | { |
788e7a89 | 973 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
974 | struct nfs_page *req = data->req; |
975 | struct page *page = req->wb_page; | |
976 | ||
977 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
88be9f99 TM |
978 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
979 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
980 | req->wb_bytes, |
981 | (long long)req_offset(req)); | |
982 | ||
788e7a89 TM |
983 | if (nfs_writeback_done(task, data) != 0) |
984 | return; | |
985 | ||
986 | if (task->tk_status < 0) { | |
a301b777 | 987 | nfs_set_pageerror(page); |
7b159fc1 | 988 | nfs_context_set_write_error(req->wb_context, task->tk_status); |
788e7a89 | 989 | dprintk(", error = %d\n", task->tk_status); |
8e821cad | 990 | goto out; |
1da177e4 LT |
991 | } |
992 | ||
8e821cad | 993 | if (nfs_write_need_commit(data)) { |
587142f8 | 994 | struct inode *inode = page->mapping->host; |
8e821cad | 995 | |
587142f8 | 996 | spin_lock(&inode->i_lock); |
8e821cad TM |
997 | if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { |
998 | /* Do nothing we need to resend the writes */ | |
999 | } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
1000 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1001 | dprintk(" defer commit\n"); | |
1002 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
1003 | set_bit(PG_NEED_RESCHED, &req->wb_flags); | |
1004 | clear_bit(PG_NEED_COMMIT, &req->wb_flags); | |
1005 | dprintk(" server reboot detected\n"); | |
1006 | } | |
587142f8 | 1007 | spin_unlock(&inode->i_lock); |
8e821cad TM |
1008 | } else |
1009 | dprintk(" OK\n"); | |
1010 | ||
1011 | out: | |
1da177e4 LT |
1012 | if (atomic_dec_and_test(&req->wb_complete)) |
1013 | nfs_writepage_release(req); | |
1014 | } | |
1015 | ||
788e7a89 TM |
1016 | static const struct rpc_call_ops nfs_write_partial_ops = { |
1017 | .rpc_call_done = nfs_writeback_done_partial, | |
1018 | .rpc_release = nfs_writedata_release, | |
1019 | }; | |
1020 | ||
1da177e4 LT |
1021 | /* |
1022 | * Handle a write reply that flushes a whole page. | |
1023 | * | |
1024 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
1025 | * writebacks since the page->count is kept > 1 for as long | |
1026 | * as the page has a write request pending. | |
1027 | */ | |
788e7a89 | 1028 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 1029 | { |
788e7a89 | 1030 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
1031 | struct nfs_page *req; |
1032 | struct page *page; | |
1033 | ||
788e7a89 TM |
1034 | if (nfs_writeback_done(task, data) != 0) |
1035 | return; | |
1036 | ||
1da177e4 LT |
1037 | /* Update attributes as result of writeback. */ |
1038 | while (!list_empty(&data->pages)) { | |
1039 | req = nfs_list_entry(data->pages.next); | |
1040 | nfs_list_remove_request(req); | |
1041 | page = req->wb_page; | |
1042 | ||
1043 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
88be9f99 TM |
1044 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1045 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1046 | req->wb_bytes, |
1047 | (long long)req_offset(req)); | |
1048 | ||
788e7a89 | 1049 | if (task->tk_status < 0) { |
a301b777 | 1050 | nfs_set_pageerror(page); |
7b159fc1 | 1051 | nfs_context_set_write_error(req->wb_context, task->tk_status); |
788e7a89 | 1052 | dprintk(", error = %d\n", task->tk_status); |
8e821cad | 1053 | goto remove_request; |
1da177e4 | 1054 | } |
1da177e4 | 1055 | |
8e821cad TM |
1056 | if (nfs_write_need_commit(data)) { |
1057 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1058 | nfs_mark_request_commit(req); | |
1059 | nfs_end_page_writeback(page); | |
1060 | dprintk(" marked for commit\n"); | |
1da177e4 LT |
1061 | goto next; |
1062 | } | |
44dd151d TM |
1063 | /* Set the PG_uptodate flag? */ |
1064 | nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); | |
8e821cad TM |
1065 | dprintk(" OK\n"); |
1066 | remove_request: | |
1067 | nfs_end_page_writeback(page); | |
1da177e4 | 1068 | nfs_inode_remove_request(req); |
1da177e4 | 1069 | next: |
9fd367f0 | 1070 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
1071 | } |
1072 | } | |
1073 | ||
788e7a89 TM |
1074 | static const struct rpc_call_ops nfs_write_full_ops = { |
1075 | .rpc_call_done = nfs_writeback_done_full, | |
1076 | .rpc_release = nfs_writedata_release, | |
1077 | }; | |
1078 | ||
1079 | ||
1da177e4 LT |
1080 | /* |
1081 | * This function is called when the WRITE call is complete. | |
1082 | */ | |
462d5b32 | 1083 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1084 | { |
1da177e4 LT |
1085 | struct nfs_writeargs *argp = &data->args; |
1086 | struct nfs_writeres *resp = &data->res; | |
788e7a89 | 1087 | int status; |
1da177e4 | 1088 | |
a3f565b1 | 1089 | dprintk("NFS: %5u nfs_writeback_done (status %d)\n", |
1da177e4 LT |
1090 | task->tk_pid, task->tk_status); |
1091 | ||
f551e44f CL |
1092 | /* |
1093 | * ->write_done will attempt to use post-op attributes to detect | |
1094 | * conflicting writes by other clients. A strict interpretation | |
1095 | * of close-to-open would allow us to continue caching even if | |
1096 | * another writer had changed the file, but some applications | |
1097 | * depend on tighter cache coherency when writing. | |
1098 | */ | |
788e7a89 TM |
1099 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1100 | if (status != 0) | |
1101 | return status; | |
91d5b470 CL |
1102 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1103 | ||
1da177e4 LT |
1104 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1105 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1106 | /* We tried a write call, but the server did not | |
1107 | * commit data to stable storage even though we | |
1108 | * requested it. | |
1109 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1110 | * the server reports NFS_DATA_SYNC, but performs | |
1111 | * NFS_FILE_SYNC. We therefore implement this checking | |
1112 | * as a dprintk() in order to avoid filling syslog. | |
1113 | */ | |
1114 | static unsigned long complain; | |
1115 | ||
1116 | if (time_before(complain, jiffies)) { | |
1117 | dprintk("NFS: faulty NFS server %s:" | |
1118 | " (committed = %d) != (stable = %d)\n", | |
54ceac45 | 1119 | NFS_SERVER(data->inode)->nfs_client->cl_hostname, |
1da177e4 LT |
1120 | resp->verf->committed, argp->stable); |
1121 | complain = jiffies + 300 * HZ; | |
1122 | } | |
1123 | } | |
1124 | #endif | |
1125 | /* Is this a short write? */ | |
1126 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1127 | static unsigned long complain; | |
1128 | ||
91d5b470 CL |
1129 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1130 | ||
1da177e4 LT |
1131 | /* Has the server at least made some progress? */ |
1132 | if (resp->count != 0) { | |
1133 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1134 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1135 | /* Resend from where the server left off */ | |
1136 | argp->offset += resp->count; | |
1137 | argp->pgbase += resp->count; | |
1138 | argp->count -= resp->count; | |
1139 | } else { | |
1140 | /* Resend as a stable write in order to avoid | |
1141 | * headaches in the case of a server crash. | |
1142 | */ | |
1143 | argp->stable = NFS_FILE_SYNC; | |
1144 | } | |
1145 | rpc_restart_call(task); | |
788e7a89 | 1146 | return -EAGAIN; |
1da177e4 LT |
1147 | } |
1148 | if (time_before(complain, jiffies)) { | |
1149 | printk(KERN_WARNING | |
1150 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1151 | argp->count); | |
1152 | complain = jiffies + 300 * HZ; | |
1153 | } | |
1154 | /* Can't do anything about it except throw an error. */ | |
1155 | task->tk_status = -EIO; | |
1156 | } | |
788e7a89 | 1157 | return 0; |
1da177e4 LT |
1158 | } |
1159 | ||
1160 | ||
1161 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
963d8fe5 | 1162 | void nfs_commit_release(void *wdata) |
1da177e4 | 1163 | { |
1da177e4 LT |
1164 | nfs_commit_free(wdata); |
1165 | } | |
1166 | ||
1167 | /* | |
1168 | * Set up the argument/result storage required for the RPC call. | |
1169 | */ | |
1170 | static void nfs_commit_rpcsetup(struct list_head *head, | |
788e7a89 TM |
1171 | struct nfs_write_data *data, |
1172 | int how) | |
1da177e4 | 1173 | { |
84115e1c TM |
1174 | struct nfs_page *first = nfs_list_entry(head->next); |
1175 | struct inode *inode = first->wb_context->path.dentry->d_inode; | |
1176 | int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
3ff7576d | 1177 | int priority = flush_task_priority(how); |
07737691 | 1178 | struct rpc_task *task; |
bdc7f021 TM |
1179 | struct rpc_message msg = { |
1180 | .rpc_argp = &data->args, | |
1181 | .rpc_resp = &data->res, | |
1182 | .rpc_cred = first->wb_context->cred, | |
1183 | }; | |
84115e1c | 1184 | struct rpc_task_setup task_setup_data = { |
07737691 | 1185 | .task = &data->task, |
84115e1c | 1186 | .rpc_client = NFS_CLIENT(inode), |
bdc7f021 | 1187 | .rpc_message = &msg, |
84115e1c TM |
1188 | .callback_ops = &nfs_commit_ops, |
1189 | .callback_data = data, | |
1190 | .flags = flags, | |
3ff7576d | 1191 | .priority = priority, |
84115e1c | 1192 | }; |
1da177e4 LT |
1193 | |
1194 | /* Set up the RPC argument and reply structs | |
1195 | * NB: take care not to mess about with data->commit et al. */ | |
1196 | ||
1197 | list_splice_init(head, &data->pages); | |
1da177e4 | 1198 | |
1da177e4 | 1199 | data->inode = inode; |
bdc7f021 | 1200 | data->cred = msg.rpc_cred; |
1da177e4 LT |
1201 | |
1202 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1203 | /* Note: we always request a commit of the entire inode */ |
1204 | data->args.offset = 0; | |
1205 | data->args.count = 0; | |
1206 | data->res.count = 0; | |
1da177e4 LT |
1207 | data->res.fattr = &data->fattr; |
1208 | data->res.verf = &data->verf; | |
0e574af1 | 1209 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1210 | |
1211 | /* Set up the initial task struct. */ | |
bdc7f021 | 1212 | NFS_PROTO(inode)->commit_setup(data, &msg); |
1da177e4 | 1213 | |
a3f565b1 | 1214 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); |
bdc7f021 | 1215 | |
07737691 TM |
1216 | task = rpc_run_task(&task_setup_data); |
1217 | if (!IS_ERR(task)) | |
1218 | rpc_put_task(task); | |
1da177e4 LT |
1219 | } |
1220 | ||
1221 | /* | |
1222 | * Commit dirty pages | |
1223 | */ | |
1224 | static int | |
40859d7e | 1225 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1226 | { |
1227 | struct nfs_write_data *data; | |
1228 | struct nfs_page *req; | |
1229 | ||
e9f7bee1 | 1230 | data = nfs_commit_alloc(); |
1da177e4 LT |
1231 | |
1232 | if (!data) | |
1233 | goto out_bad; | |
1234 | ||
1235 | /* Set up the argument struct */ | |
1236 | nfs_commit_rpcsetup(head, data, how); | |
1237 | ||
1da177e4 LT |
1238 | return 0; |
1239 | out_bad: | |
1240 | while (!list_empty(head)) { | |
1241 | req = nfs_list_entry(head->next); | |
1242 | nfs_list_remove_request(req); | |
1243 | nfs_mark_request_commit(req); | |
83715ad5 | 1244 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 PZ |
1245 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
1246 | BDI_RECLAIMABLE); | |
9fd367f0 | 1247 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
1248 | } |
1249 | return -ENOMEM; | |
1250 | } | |
1251 | ||
1252 | /* | |
1253 | * COMMIT call returned | |
1254 | */ | |
788e7a89 | 1255 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1256 | { |
963d8fe5 | 1257 | struct nfs_write_data *data = calldata; |
1da177e4 | 1258 | struct nfs_page *req; |
1da177e4 | 1259 | |
a3f565b1 | 1260 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
1da177e4 LT |
1261 | task->tk_pid, task->tk_status); |
1262 | ||
788e7a89 TM |
1263 | /* Call the NFS version-specific code */ |
1264 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1265 | return; | |
1266 | ||
1da177e4 LT |
1267 | while (!list_empty(&data->pages)) { |
1268 | req = nfs_list_entry(data->pages.next); | |
1269 | nfs_list_remove_request(req); | |
612c9384 | 1270 | clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
fd39fc85 | 1271 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 PZ |
1272 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
1273 | BDI_RECLAIMABLE); | |
1da177e4 LT |
1274 | |
1275 | dprintk("NFS: commit (%s/%Ld %d@%Ld)", | |
88be9f99 TM |
1276 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1277 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1278 | req->wb_bytes, |
1279 | (long long)req_offset(req)); | |
1280 | if (task->tk_status < 0) { | |
7b159fc1 | 1281 | nfs_context_set_write_error(req->wb_context, task->tk_status); |
1da177e4 LT |
1282 | nfs_inode_remove_request(req); |
1283 | dprintk(", error = %d\n", task->tk_status); | |
1284 | goto next; | |
1285 | } | |
1286 | ||
1287 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1288 | * returned by the server against all stored verfs. */ | |
1289 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1290 | /* We have a match */ | |
44dd151d TM |
1291 | /* Set the PG_uptodate flag */ |
1292 | nfs_mark_uptodate(req->wb_page, req->wb_pgbase, | |
1293 | req->wb_bytes); | |
1da177e4 LT |
1294 | nfs_inode_remove_request(req); |
1295 | dprintk(" OK\n"); | |
1296 | goto next; | |
1297 | } | |
1298 | /* We have a mismatch. Write the page again */ | |
1299 | dprintk(" mismatch\n"); | |
61822ab5 | 1300 | nfs_redirty_request(req); |
1da177e4 | 1301 | next: |
9fd367f0 | 1302 | nfs_clear_page_tag_locked(req); |
1da177e4 | 1303 | } |
1da177e4 | 1304 | } |
788e7a89 TM |
1305 | |
1306 | static const struct rpc_call_ops nfs_commit_ops = { | |
1307 | .rpc_call_done = nfs_commit_done, | |
1308 | .rpc_release = nfs_commit_release, | |
1309 | }; | |
1da177e4 | 1310 | |
3da28eb1 | 1311 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 | 1312 | { |
1da177e4 | 1313 | LIST_HEAD(head); |
7d46a49f | 1314 | int res; |
1da177e4 | 1315 | |
587142f8 | 1316 | spin_lock(&inode->i_lock); |
3da28eb1 | 1317 | res = nfs_scan_commit(inode, &head, 0, 0); |
587142f8 | 1318 | spin_unlock(&inode->i_lock); |
1da177e4 | 1319 | if (res) { |
7d46a49f | 1320 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1321 | if (error < 0) |
1322 | return error; | |
1323 | } | |
1da177e4 LT |
1324 | return res; |
1325 | } | |
c63c7b05 TM |
1326 | #else |
1327 | static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) | |
1328 | { | |
1329 | return 0; | |
1330 | } | |
1da177e4 LT |
1331 | #endif |
1332 | ||
1c75950b | 1333 | long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1334 | { |
1c75950b | 1335 | struct inode *inode = mapping->host; |
ca52fec1 | 1336 | pgoff_t idx_start, idx_end; |
1c75950b | 1337 | unsigned int npages = 0; |
c42de9dd | 1338 | LIST_HEAD(head); |
70b9ecbd | 1339 | int nocommit = how & FLUSH_NOCOMMIT; |
3f442547 | 1340 | long pages, ret; |
1da177e4 | 1341 | |
1c75950b TM |
1342 | /* FIXME */ |
1343 | if (wbc->range_cyclic) | |
1344 | idx_start = 0; | |
1345 | else { | |
1346 | idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1347 | idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1348 | if (idx_end > idx_start) { | |
ca52fec1 | 1349 | pgoff_t l_npages = 1 + idx_end - idx_start; |
1c75950b TM |
1350 | npages = l_npages; |
1351 | if (sizeof(npages) != sizeof(l_npages) && | |
ca52fec1 | 1352 | (pgoff_t)npages != l_npages) |
1c75950b TM |
1353 | npages = 0; |
1354 | } | |
1355 | } | |
c42de9dd | 1356 | how &= ~FLUSH_NOCOMMIT; |
587142f8 | 1357 | spin_lock(&inode->i_lock); |
1da177e4 | 1358 | do { |
c42de9dd TM |
1359 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); |
1360 | if (ret != 0) | |
70b9ecbd | 1361 | continue; |
c42de9dd TM |
1362 | if (nocommit) |
1363 | break; | |
d2ccddf0 | 1364 | pages = nfs_scan_commit(inode, &head, idx_start, npages); |
724c439c | 1365 | if (pages == 0) |
c42de9dd | 1366 | break; |
d2ccddf0 | 1367 | if (how & FLUSH_INVALIDATE) { |
587142f8 | 1368 | spin_unlock(&inode->i_lock); |
83715ad5 | 1369 | nfs_cancel_commit_list(&head); |
e8e058e8 | 1370 | ret = pages; |
587142f8 | 1371 | spin_lock(&inode->i_lock); |
d2ccddf0 TM |
1372 | continue; |
1373 | } | |
1374 | pages += nfs_scan_commit(inode, &head, 0, 0); | |
587142f8 | 1375 | spin_unlock(&inode->i_lock); |
c42de9dd | 1376 | ret = nfs_commit_list(inode, &head, how); |
587142f8 TM |
1377 | spin_lock(&inode->i_lock); |
1378 | ||
c42de9dd | 1379 | } while (ret >= 0); |
587142f8 | 1380 | spin_unlock(&inode->i_lock); |
c42de9dd | 1381 | return ret; |
1da177e4 LT |
1382 | } |
1383 | ||
34901f70 | 1384 | static int __nfs_write_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) |
1c75950b | 1385 | { |
1c75950b TM |
1386 | int ret; |
1387 | ||
34901f70 | 1388 | ret = nfs_writepages(mapping, wbc); |
61822ab5 TM |
1389 | if (ret < 0) |
1390 | goto out; | |
34901f70 | 1391 | ret = nfs_sync_mapping_wait(mapping, wbc, how); |
ed90ef51 TM |
1392 | if (ret < 0) |
1393 | goto out; | |
1394 | return 0; | |
61822ab5 | 1395 | out: |
e507d9eb | 1396 | __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); |
1c75950b TM |
1397 | return ret; |
1398 | } | |
1399 | ||
34901f70 TM |
1400 | /* Two pass sync: first using WB_SYNC_NONE, then WB_SYNC_ALL */ |
1401 | static int nfs_write_mapping(struct address_space *mapping, int how) | |
1402 | { | |
1403 | struct writeback_control wbc = { | |
1404 | .bdi = mapping->backing_dev_info, | |
1405 | .sync_mode = WB_SYNC_NONE, | |
1406 | .nr_to_write = LONG_MAX, | |
1407 | .for_writepages = 1, | |
1408 | .range_cyclic = 1, | |
1409 | }; | |
1410 | int ret; | |
1411 | ||
1412 | ret = __nfs_write_mapping(mapping, &wbc, how); | |
1413 | if (ret < 0) | |
1414 | return ret; | |
1415 | wbc.sync_mode = WB_SYNC_ALL; | |
1416 | return __nfs_write_mapping(mapping, &wbc, how); | |
1417 | } | |
1418 | ||
ed90ef51 TM |
1419 | /* |
1420 | * flush the inode to disk. | |
1421 | */ | |
1422 | int nfs_wb_all(struct inode *inode) | |
1c75950b | 1423 | { |
ed90ef51 TM |
1424 | return nfs_write_mapping(inode->i_mapping, 0); |
1425 | } | |
1c75950b | 1426 | |
ed90ef51 TM |
1427 | int nfs_wb_nocommit(struct inode *inode) |
1428 | { | |
1429 | return nfs_write_mapping(inode->i_mapping, FLUSH_NOCOMMIT); | |
1c75950b TM |
1430 | } |
1431 | ||
1b3b4a1a TM |
1432 | int nfs_wb_page_cancel(struct inode *inode, struct page *page) |
1433 | { | |
1434 | struct nfs_page *req; | |
1435 | loff_t range_start = page_offset(page); | |
1436 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
1437 | struct writeback_control wbc = { | |
1438 | .bdi = page->mapping->backing_dev_info, | |
1439 | .sync_mode = WB_SYNC_ALL, | |
1440 | .nr_to_write = LONG_MAX, | |
1441 | .range_start = range_start, | |
1442 | .range_end = range_end, | |
1443 | }; | |
1444 | int ret = 0; | |
1445 | ||
1446 | BUG_ON(!PageLocked(page)); | |
1447 | for (;;) { | |
1448 | req = nfs_page_find_request(page); | |
1449 | if (req == NULL) | |
1450 | goto out; | |
1451 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
1452 | nfs_release_request(req); | |
1453 | break; | |
1454 | } | |
1455 | if (nfs_lock_request_dontget(req)) { | |
1456 | nfs_inode_remove_request(req); | |
1457 | /* | |
1458 | * In case nfs_inode_remove_request has marked the | |
1459 | * page as being dirty | |
1460 | */ | |
1461 | cancel_dirty_page(page, PAGE_CACHE_SIZE); | |
1462 | nfs_unlock_request(req); | |
1463 | break; | |
1464 | } | |
1465 | ret = nfs_wait_on_request(req); | |
1466 | if (ret < 0) | |
1467 | goto out; | |
1468 | } | |
1469 | if (!PagePrivate(page)) | |
1470 | return 0; | |
1471 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, FLUSH_INVALIDATE); | |
1472 | out: | |
1473 | return ret; | |
1474 | } | |
1475 | ||
5334eb13 AB |
1476 | static int nfs_wb_page_priority(struct inode *inode, struct page *page, |
1477 | int how) | |
1c75950b TM |
1478 | { |
1479 | loff_t range_start = page_offset(page); | |
1480 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
4d770ccf TM |
1481 | struct writeback_control wbc = { |
1482 | .bdi = page->mapping->backing_dev_info, | |
1483 | .sync_mode = WB_SYNC_ALL, | |
1484 | .nr_to_write = LONG_MAX, | |
1485 | .range_start = range_start, | |
1486 | .range_end = range_end, | |
1487 | }; | |
1488 | int ret; | |
1c75950b | 1489 | |
4d770ccf | 1490 | BUG_ON(!PageLocked(page)); |
c63c7b05 | 1491 | if (clear_page_dirty_for_io(page)) { |
4d770ccf TM |
1492 | ret = nfs_writepage_locked(page, &wbc); |
1493 | if (ret < 0) | |
1494 | goto out; | |
1495 | } | |
f40313ac TM |
1496 | if (!PagePrivate(page)) |
1497 | return 0; | |
4d770ccf TM |
1498 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); |
1499 | if (ret >= 0) | |
1500 | return 0; | |
1501 | out: | |
e507d9eb | 1502 | __mark_inode_dirty(inode, I_DIRTY_PAGES); |
4d770ccf | 1503 | return ret; |
1c75950b TM |
1504 | } |
1505 | ||
1506 | /* | |
1507 | * Write back all requests on one page - we do this before reading it. | |
1508 | */ | |
1509 | int nfs_wb_page(struct inode *inode, struct page* page) | |
1510 | { | |
4d770ccf | 1511 | return nfs_wb_page_priority(inode, page, FLUSH_STABLE); |
1c75950b TM |
1512 | } |
1513 | ||
f7b422b1 | 1514 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1515 | { |
1516 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1517 | sizeof(struct nfs_write_data), | |
1518 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1519 | NULL); |
1da177e4 LT |
1520 | if (nfs_wdata_cachep == NULL) |
1521 | return -ENOMEM; | |
1522 | ||
93d2341c MD |
1523 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1524 | nfs_wdata_cachep); | |
1da177e4 LT |
1525 | if (nfs_wdata_mempool == NULL) |
1526 | return -ENOMEM; | |
1527 | ||
93d2341c MD |
1528 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1529 | nfs_wdata_cachep); | |
1da177e4 LT |
1530 | if (nfs_commit_mempool == NULL) |
1531 | return -ENOMEM; | |
1532 | ||
89a09141 PZ |
1533 | /* |
1534 | * NFS congestion size, scale with available memory. | |
1535 | * | |
1536 | * 64MB: 8192k | |
1537 | * 128MB: 11585k | |
1538 | * 256MB: 16384k | |
1539 | * 512MB: 23170k | |
1540 | * 1GB: 32768k | |
1541 | * 2GB: 46340k | |
1542 | * 4GB: 65536k | |
1543 | * 8GB: 92681k | |
1544 | * 16GB: 131072k | |
1545 | * | |
1546 | * This allows larger machines to have larger/more transfers. | |
1547 | * Limit the default to 256M | |
1548 | */ | |
1549 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); | |
1550 | if (nfs_congestion_kb > 256*1024) | |
1551 | nfs_congestion_kb = 256*1024; | |
1552 | ||
1da177e4 LT |
1553 | return 0; |
1554 | } | |
1555 | ||
266bee88 | 1556 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1557 | { |
1558 | mempool_destroy(nfs_commit_mempool); | |
1559 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1560 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1561 | } |
1562 |