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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/write.c | |
3 | * | |
7c85d900 | 4 | * Write file data over NFS. |
1da177e4 LT |
5 | * |
6 | * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de> | |
7 | */ | |
8 | ||
1da177e4 LT |
9 | #include <linux/types.h> |
10 | #include <linux/slab.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/pagemap.h> | |
13 | #include <linux/file.h> | |
1da177e4 | 14 | #include <linux/writeback.h> |
89a09141 | 15 | #include <linux/swap.h> |
074cc1de | 16 | #include <linux/migrate.h> |
1da177e4 LT |
17 | |
18 | #include <linux/sunrpc/clnt.h> | |
19 | #include <linux/nfs_fs.h> | |
20 | #include <linux/nfs_mount.h> | |
21 | #include <linux/nfs_page.h> | |
3fcfab16 AM |
22 | #include <linux/backing-dev.h> |
23 | ||
1da177e4 | 24 | #include <asm/uaccess.h> |
1da177e4 LT |
25 | |
26 | #include "delegation.h" | |
49a70f27 | 27 | #include "internal.h" |
91d5b470 | 28 | #include "iostat.h" |
def6ed7e | 29 | #include "nfs4_fs.h" |
074cc1de | 30 | #include "fscache.h" |
1da177e4 LT |
31 | |
32 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE | |
33 | ||
34 | #define MIN_POOL_WRITE (32) | |
35 | #define MIN_POOL_COMMIT (4) | |
36 | ||
37 | /* | |
38 | * Local function declarations | |
39 | */ | |
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 | ||
1ae88b2e | 90 | 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 | ||
1ae88b2e | 97 | static void nfs_writedata_release(struct nfs_write_data *wdata) |
1da177e4 | 98 | { |
383ba719 | 99 | put_nfs_open_context(wdata->args.context); |
1da177e4 LT |
100 | nfs_writedata_free(wdata); |
101 | } | |
102 | ||
7b159fc1 TM |
103 | static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error) |
104 | { | |
105 | ctx->error = error; | |
106 | smp_wmb(); | |
107 | set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
108 | } | |
109 | ||
277459d2 TM |
110 | static struct nfs_page *nfs_page_find_request_locked(struct page *page) |
111 | { | |
112 | struct nfs_page *req = NULL; | |
113 | ||
114 | if (PagePrivate(page)) { | |
115 | req = (struct nfs_page *)page_private(page); | |
116 | if (req != NULL) | |
c03b4024 | 117 | kref_get(&req->wb_kref); |
277459d2 TM |
118 | } |
119 | return req; | |
120 | } | |
121 | ||
122 | static struct nfs_page *nfs_page_find_request(struct page *page) | |
123 | { | |
587142f8 | 124 | struct inode *inode = page->mapping->host; |
277459d2 | 125 | struct nfs_page *req = NULL; |
277459d2 | 126 | |
587142f8 | 127 | spin_lock(&inode->i_lock); |
277459d2 | 128 | req = nfs_page_find_request_locked(page); |
587142f8 | 129 | spin_unlock(&inode->i_lock); |
277459d2 TM |
130 | return req; |
131 | } | |
132 | ||
1da177e4 LT |
133 | /* Adjust the file length if we're writing beyond the end */ |
134 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) | |
135 | { | |
136 | struct inode *inode = page->mapping->host; | |
a3d01454 TM |
137 | loff_t end, i_size; |
138 | pgoff_t end_index; | |
1da177e4 | 139 | |
a3d01454 TM |
140 | spin_lock(&inode->i_lock); |
141 | i_size = i_size_read(inode); | |
142 | end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; | |
1da177e4 | 143 | if (i_size > 0 && page->index < end_index) |
a3d01454 | 144 | goto out; |
1da177e4 LT |
145 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); |
146 | if (i_size >= end) | |
a3d01454 | 147 | goto out; |
1da177e4 | 148 | i_size_write(inode, end); |
a3d01454 TM |
149 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
150 | out: | |
151 | spin_unlock(&inode->i_lock); | |
1da177e4 LT |
152 | } |
153 | ||
a301b777 TM |
154 | /* A writeback failed: mark the page as bad, and invalidate the page cache */ |
155 | static void nfs_set_pageerror(struct page *page) | |
156 | { | |
157 | SetPageError(page); | |
158 | nfs_zap_mapping(page->mapping->host, page->mapping); | |
159 | } | |
160 | ||
1da177e4 LT |
161 | /* We can set the PG_uptodate flag if we see that a write request |
162 | * covers the full page. | |
163 | */ | |
164 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) | |
165 | { | |
1da177e4 LT |
166 | if (PageUptodate(page)) |
167 | return; | |
168 | if (base != 0) | |
169 | return; | |
49a70f27 | 170 | if (count != nfs_page_length(page)) |
1da177e4 | 171 | return; |
49a70f27 | 172 | SetPageUptodate(page); |
1da177e4 LT |
173 | } |
174 | ||
1da177e4 LT |
175 | static int wb_priority(struct writeback_control *wbc) |
176 | { | |
177 | if (wbc->for_reclaim) | |
c63c7b05 | 178 | return FLUSH_HIGHPRI | FLUSH_STABLE; |
b17621fe | 179 | if (wbc->for_kupdate || wbc->for_background) |
1da177e4 LT |
180 | return FLUSH_LOWPRI; |
181 | return 0; | |
182 | } | |
183 | ||
89a09141 PZ |
184 | /* |
185 | * NFS congestion control | |
186 | */ | |
187 | ||
188 | int nfs_congestion_kb; | |
189 | ||
190 | #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) | |
191 | #define NFS_CONGESTION_OFF_THRESH \ | |
192 | (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) | |
193 | ||
5a6d41b3 | 194 | static int nfs_set_page_writeback(struct page *page) |
89a09141 | 195 | { |
5a6d41b3 TM |
196 | int ret = test_set_page_writeback(page); |
197 | ||
198 | if (!ret) { | |
89a09141 PZ |
199 | struct inode *inode = page->mapping->host; |
200 | struct nfs_server *nfss = NFS_SERVER(inode); | |
201 | ||
a6305ddb | 202 | page_cache_get(page); |
277866a0 | 203 | if (atomic_long_inc_return(&nfss->writeback) > |
8aa7e847 JA |
204 | NFS_CONGESTION_ON_THRESH) { |
205 | set_bdi_congested(&nfss->backing_dev_info, | |
206 | BLK_RW_ASYNC); | |
207 | } | |
89a09141 | 208 | } |
5a6d41b3 | 209 | return ret; |
89a09141 PZ |
210 | } |
211 | ||
212 | static void nfs_end_page_writeback(struct page *page) | |
213 | { | |
214 | struct inode *inode = page->mapping->host; | |
215 | struct nfs_server *nfss = NFS_SERVER(inode); | |
216 | ||
217 | end_page_writeback(page); | |
a6305ddb | 218 | page_cache_release(page); |
c4dc4bee | 219 | if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) |
8aa7e847 | 220 | clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC); |
89a09141 PZ |
221 | } |
222 | ||
cfb506e1 | 223 | static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock) |
e261f51f | 224 | { |
587142f8 | 225 | struct inode *inode = page->mapping->host; |
e261f51f | 226 | struct nfs_page *req; |
e261f51f TM |
227 | int ret; |
228 | ||
587142f8 | 229 | spin_lock(&inode->i_lock); |
074cc1de | 230 | for (;;) { |
e261f51f | 231 | req = nfs_page_find_request_locked(page); |
074cc1de TM |
232 | if (req == NULL) |
233 | break; | |
acee478a | 234 | if (nfs_set_page_tag_locked(req)) |
e261f51f TM |
235 | break; |
236 | /* Note: If we hold the page lock, as is the case in nfs_writepage, | |
acee478a | 237 | * then the call to nfs_set_page_tag_locked() will always |
e261f51f TM |
238 | * succeed provided that someone hasn't already marked the |
239 | * request as dirty (in which case we don't care). | |
240 | */ | |
587142f8 | 241 | spin_unlock(&inode->i_lock); |
cfb506e1 TM |
242 | if (!nonblock) |
243 | ret = nfs_wait_on_request(req); | |
244 | else | |
245 | ret = -EAGAIN; | |
e261f51f TM |
246 | nfs_release_request(req); |
247 | if (ret != 0) | |
074cc1de | 248 | return ERR_PTR(ret); |
587142f8 | 249 | spin_lock(&inode->i_lock); |
e261f51f | 250 | } |
587142f8 | 251 | spin_unlock(&inode->i_lock); |
074cc1de TM |
252 | return req; |
253 | } | |
254 | ||
255 | /* | |
256 | * Find an associated nfs write request, and prepare to flush it out | |
257 | * May return an error if the user signalled nfs_wait_on_request(). | |
258 | */ | |
259 | static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, | |
cfb506e1 | 260 | struct page *page, bool nonblock) |
074cc1de TM |
261 | { |
262 | struct nfs_page *req; | |
263 | int ret = 0; | |
264 | ||
cfb506e1 | 265 | req = nfs_find_and_lock_request(page, nonblock); |
074cc1de TM |
266 | if (!req) |
267 | goto out; | |
268 | ret = PTR_ERR(req); | |
269 | if (IS_ERR(req)) | |
270 | goto out; | |
271 | ||
272 | ret = nfs_set_page_writeback(page); | |
273 | BUG_ON(ret != 0); | |
274 | BUG_ON(test_bit(PG_CLEAN, &req->wb_flags)); | |
275 | ||
f8512ad0 FI |
276 | if (!nfs_pageio_add_request(pgio, req)) { |
277 | nfs_redirty_request(req); | |
074cc1de | 278 | ret = pgio->pg_error; |
f8512ad0 | 279 | } |
074cc1de TM |
280 | out: |
281 | return ret; | |
e261f51f TM |
282 | } |
283 | ||
f758c885 | 284 | static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) |
1da177e4 | 285 | { |
1da177e4 | 286 | struct inode *inode = page->mapping->host; |
cfb506e1 | 287 | int ret; |
1da177e4 | 288 | |
91d5b470 CL |
289 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
290 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
291 | ||
7fe7f848 | 292 | nfs_pageio_cond_complete(pgio, page->index); |
1b430bee | 293 | ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE); |
cfb506e1 TM |
294 | if (ret == -EAGAIN) { |
295 | redirty_page_for_writepage(wbc, page); | |
296 | ret = 0; | |
297 | } | |
298 | return ret; | |
f758c885 | 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; |
72cb77f4 | 340 | unsigned long *bitlock = &NFS_I(inode)->flags; |
c63c7b05 | 341 | struct nfs_pageio_descriptor pgio; |
1da177e4 LT |
342 | int err; |
343 | ||
72cb77f4 TM |
344 | /* Stop dirtying of new pages while we sync */ |
345 | err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING, | |
346 | nfs_wait_bit_killable, TASK_KILLABLE); | |
347 | if (err) | |
348 | goto out_err; | |
349 | ||
91d5b470 CL |
350 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
351 | ||
c63c7b05 | 352 | nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); |
f758c885 | 353 | err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); |
c63c7b05 | 354 | nfs_pageio_complete(&pgio); |
72cb77f4 TM |
355 | |
356 | clear_bit_unlock(NFS_INO_FLUSHING, bitlock); | |
357 | smp_mb__after_clear_bit(); | |
358 | wake_up_bit(bitlock, NFS_INO_FLUSHING); | |
359 | ||
f758c885 | 360 | if (err < 0) |
72cb77f4 TM |
361 | goto out_err; |
362 | err = pgio.pg_error; | |
363 | if (err < 0) | |
364 | goto out_err; | |
c63c7b05 | 365 | return 0; |
72cb77f4 TM |
366 | out_err: |
367 | return err; | |
1da177e4 LT |
368 | } |
369 | ||
370 | /* | |
371 | * Insert a write request into an inode | |
372 | */ | |
e7d39069 | 373 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) |
1da177e4 LT |
374 | { |
375 | struct nfs_inode *nfsi = NFS_I(inode); | |
376 | int error; | |
377 | ||
e7d39069 TM |
378 | error = radix_tree_preload(GFP_NOFS); |
379 | if (error != 0) | |
380 | goto out; | |
381 | ||
382 | /* Lock the request! */ | |
383 | nfs_lock_request_dontget(req); | |
384 | ||
385 | spin_lock(&inode->i_lock); | |
1da177e4 | 386 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); |
27852596 | 387 | BUG_ON(error); |
1da177e4 LT |
388 | if (!nfsi->npages) { |
389 | igrab(inode); | |
1da177e4 LT |
390 | if (nfs_have_delegation(inode, FMODE_WRITE)) |
391 | nfsi->change_attr++; | |
392 | } | |
deb7d638 | 393 | SetPagePrivate(req->wb_page); |
277459d2 | 394 | set_page_private(req->wb_page, (unsigned long)req); |
1da177e4 | 395 | nfsi->npages++; |
c03b4024 | 396 | kref_get(&req->wb_kref); |
27852596 NP |
397 | radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, |
398 | NFS_PAGE_TAG_LOCKED); | |
e7d39069 TM |
399 | spin_unlock(&inode->i_lock); |
400 | radix_tree_preload_end(); | |
401 | out: | |
402 | return error; | |
1da177e4 LT |
403 | } |
404 | ||
405 | /* | |
89a09141 | 406 | * Remove a write request from an inode |
1da177e4 LT |
407 | */ |
408 | static void nfs_inode_remove_request(struct nfs_page *req) | |
409 | { | |
88be9f99 | 410 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
411 | struct nfs_inode *nfsi = NFS_I(inode); |
412 | ||
413 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
414 | ||
587142f8 | 415 | spin_lock(&inode->i_lock); |
277459d2 | 416 | set_page_private(req->wb_page, 0); |
deb7d638 | 417 | ClearPagePrivate(req->wb_page); |
1da177e4 LT |
418 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
419 | nfsi->npages--; | |
420 | if (!nfsi->npages) { | |
587142f8 | 421 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
422 | iput(inode); |
423 | } else | |
587142f8 | 424 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
425 | nfs_clear_request(req); |
426 | nfs_release_request(req); | |
427 | } | |
428 | ||
61822ab5 | 429 | static void |
6d884e8f | 430 | nfs_mark_request_dirty(struct nfs_page *req) |
61822ab5 | 431 | { |
61822ab5 | 432 | __set_page_dirty_nobuffers(req->wb_page); |
b80c3cb6 | 433 | __mark_inode_dirty(req->wb_page->mapping->host, I_DIRTY_DATASYNC); |
61822ab5 TM |
434 | } |
435 | ||
1da177e4 LT |
436 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
437 | /* | |
438 | * Add a request to the inode's commit list. | |
439 | */ | |
440 | static void | |
441 | nfs_mark_request_commit(struct nfs_page *req) | |
442 | { | |
88be9f99 | 443 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
444 | struct nfs_inode *nfsi = NFS_I(inode); |
445 | ||
587142f8 | 446 | spin_lock(&inode->i_lock); |
e468bae9 | 447 | set_bit(PG_CLEAN, &(req)->wb_flags); |
5c369683 TM |
448 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
449 | req->wb_index, | |
450 | NFS_PAGE_TAG_COMMIT); | |
ff778d02 | 451 | nfsi->ncommit++; |
587142f8 | 452 | spin_unlock(&inode->i_lock); |
fd39fc85 | 453 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 | 454 | inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE); |
a1803044 | 455 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1da177e4 | 456 | } |
8e821cad | 457 | |
e468bae9 TM |
458 | static int |
459 | nfs_clear_request_commit(struct nfs_page *req) | |
460 | { | |
461 | struct page *page = req->wb_page; | |
462 | ||
463 | if (test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) { | |
464 | dec_zone_page_state(page, NR_UNSTABLE_NFS); | |
465 | dec_bdi_stat(page->mapping->backing_dev_info, BDI_RECLAIMABLE); | |
466 | return 1; | |
467 | } | |
468 | return 0; | |
469 | } | |
470 | ||
8e821cad TM |
471 | static inline |
472 | int nfs_write_need_commit(struct nfs_write_data *data) | |
473 | { | |
474 | return data->verf.committed != NFS_FILE_SYNC; | |
475 | } | |
476 | ||
477 | static inline | |
478 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
479 | { | |
e468bae9 | 480 | if (test_and_clear_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
8e821cad TM |
481 | nfs_mark_request_commit(req); |
482 | return 1; | |
483 | } | |
484 | if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { | |
6d884e8f | 485 | nfs_mark_request_dirty(req); |
8e821cad TM |
486 | return 1; |
487 | } | |
488 | return 0; | |
489 | } | |
490 | #else | |
491 | static inline void | |
492 | nfs_mark_request_commit(struct nfs_page *req) | |
493 | { | |
494 | } | |
495 | ||
e468bae9 TM |
496 | static inline int |
497 | nfs_clear_request_commit(struct nfs_page *req) | |
498 | { | |
499 | return 0; | |
500 | } | |
501 | ||
8e821cad TM |
502 | static inline |
503 | int nfs_write_need_commit(struct nfs_write_data *data) | |
504 | { | |
505 | return 0; | |
506 | } | |
507 | ||
508 | static inline | |
509 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
510 | { | |
511 | return 0; | |
512 | } | |
1da177e4 LT |
513 | #endif |
514 | ||
47c62564 | 515 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
fb8a1f11 TM |
516 | static int |
517 | nfs_need_commit(struct nfs_inode *nfsi) | |
518 | { | |
519 | return radix_tree_tagged(&nfsi->nfs_page_tree, NFS_PAGE_TAG_COMMIT); | |
520 | } | |
521 | ||
1da177e4 LT |
522 | /* |
523 | * nfs_scan_commit - Scan an inode for commit requests | |
524 | * @inode: NFS inode to scan | |
525 | * @dst: destination list | |
526 | * @idx_start: lower bound of page->index to scan. | |
527 | * @npages: idx_start + npages sets the upper bound to scan. | |
528 | * | |
529 | * Moves requests from the inode's 'commit' request list. | |
530 | * The requests are *not* checked to ensure that they form a contiguous set. | |
531 | */ | |
532 | static int | |
ca52fec1 | 533 | nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
534 | { |
535 | struct nfs_inode *nfsi = NFS_I(inode); | |
ff778d02 | 536 | int ret; |
3da28eb1 | 537 | |
fb8a1f11 TM |
538 | if (!nfs_need_commit(nfsi)) |
539 | return 0; | |
540 | ||
ff778d02 TM |
541 | ret = nfs_scan_list(nfsi, dst, idx_start, npages, NFS_PAGE_TAG_COMMIT); |
542 | if (ret > 0) | |
543 | nfsi->ncommit -= ret; | |
2928db1f TM |
544 | if (nfs_need_commit(NFS_I(inode))) |
545 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); | |
ff778d02 | 546 | return ret; |
1da177e4 | 547 | } |
c42de9dd | 548 | #else |
fb8a1f11 TM |
549 | static inline int nfs_need_commit(struct nfs_inode *nfsi) |
550 | { | |
551 | return 0; | |
552 | } | |
553 | ||
ca52fec1 | 554 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
c42de9dd TM |
555 | { |
556 | return 0; | |
557 | } | |
1da177e4 LT |
558 | #endif |
559 | ||
1da177e4 | 560 | /* |
e7d39069 TM |
561 | * Search for an existing write request, and attempt to update |
562 | * it to reflect a new dirty region on a given page. | |
1da177e4 | 563 | * |
e7d39069 TM |
564 | * If the attempt fails, then the existing request is flushed out |
565 | * to disk. | |
1da177e4 | 566 | */ |
e7d39069 TM |
567 | static struct nfs_page *nfs_try_to_update_request(struct inode *inode, |
568 | struct page *page, | |
569 | unsigned int offset, | |
570 | unsigned int bytes) | |
1da177e4 | 571 | { |
e7d39069 TM |
572 | struct nfs_page *req; |
573 | unsigned int rqend; | |
574 | unsigned int end; | |
575 | int error; | |
576 | ||
577 | if (!PagePrivate(page)) | |
578 | return NULL; | |
1da177e4 LT |
579 | |
580 | end = offset + bytes; | |
e7d39069 | 581 | spin_lock(&inode->i_lock); |
1da177e4 | 582 | |
1da177e4 | 583 | for (;;) { |
277459d2 | 584 | req = nfs_page_find_request_locked(page); |
e7d39069 TM |
585 | if (req == NULL) |
586 | goto out_unlock; | |
587 | ||
588 | rqend = req->wb_offset + req->wb_bytes; | |
589 | /* | |
590 | * Tell the caller to flush out the request if | |
591 | * the offsets are non-contiguous. | |
592 | * Note: nfs_flush_incompatible() will already | |
593 | * have flushed out requests having wrong owners. | |
594 | */ | |
e468bae9 | 595 | if (offset > rqend |
e7d39069 TM |
596 | || end < req->wb_offset) |
597 | goto out_flushme; | |
598 | ||
599 | if (nfs_set_page_tag_locked(req)) | |
1da177e4 | 600 | break; |
1da177e4 | 601 | |
e7d39069 | 602 | /* The request is locked, so wait and then retry */ |
587142f8 | 603 | spin_unlock(&inode->i_lock); |
e7d39069 TM |
604 | error = nfs_wait_on_request(req); |
605 | nfs_release_request(req); | |
606 | if (error != 0) | |
607 | goto out_err; | |
608 | spin_lock(&inode->i_lock); | |
1da177e4 LT |
609 | } |
610 | ||
ff778d02 TM |
611 | if (nfs_clear_request_commit(req) && |
612 | radix_tree_tag_clear(&NFS_I(inode)->nfs_page_tree, | |
613 | req->wb_index, NFS_PAGE_TAG_COMMIT) != NULL) | |
614 | NFS_I(inode)->ncommit--; | |
e468bae9 | 615 | |
1da177e4 LT |
616 | /* Okay, the request matches. Update the region */ |
617 | if (offset < req->wb_offset) { | |
618 | req->wb_offset = offset; | |
619 | req->wb_pgbase = offset; | |
1da177e4 | 620 | } |
1da177e4 LT |
621 | if (end > rqend) |
622 | req->wb_bytes = end - req->wb_offset; | |
e7d39069 TM |
623 | else |
624 | req->wb_bytes = rqend - req->wb_offset; | |
625 | out_unlock: | |
626 | spin_unlock(&inode->i_lock); | |
627 | return req; | |
628 | out_flushme: | |
629 | spin_unlock(&inode->i_lock); | |
630 | nfs_release_request(req); | |
631 | error = nfs_wb_page(inode, page); | |
632 | out_err: | |
633 | return ERR_PTR(error); | |
634 | } | |
635 | ||
636 | /* | |
637 | * Try to update an existing write request, or create one if there is none. | |
638 | * | |
639 | * Note: Should always be called with the Page Lock held to prevent races | |
640 | * if we have to add a new request. Also assumes that the caller has | |
641 | * already called nfs_flush_incompatible() if necessary. | |
642 | */ | |
643 | static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx, | |
644 | struct page *page, unsigned int offset, unsigned int bytes) | |
645 | { | |
646 | struct inode *inode = page->mapping->host; | |
647 | struct nfs_page *req; | |
648 | int error; | |
1da177e4 | 649 | |
e7d39069 TM |
650 | req = nfs_try_to_update_request(inode, page, offset, bytes); |
651 | if (req != NULL) | |
652 | goto out; | |
653 | req = nfs_create_request(ctx, inode, page, offset, bytes); | |
654 | if (IS_ERR(req)) | |
655 | goto out; | |
656 | error = nfs_inode_add_request(inode, req); | |
657 | if (error != 0) { | |
658 | nfs_release_request(req); | |
659 | req = ERR_PTR(error); | |
660 | } | |
efc91ed0 | 661 | out: |
61e930a9 | 662 | return req; |
1da177e4 LT |
663 | } |
664 | ||
e7d39069 TM |
665 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
666 | unsigned int offset, unsigned int count) | |
667 | { | |
668 | struct nfs_page *req; | |
669 | ||
670 | req = nfs_setup_write_request(ctx, page, offset, count); | |
671 | if (IS_ERR(req)) | |
672 | return PTR_ERR(req); | |
b80c3cb6 | 673 | nfs_mark_request_dirty(req); |
e7d39069 TM |
674 | /* Update file length */ |
675 | nfs_grow_file(page, offset, count); | |
676 | nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); | |
a6305ddb | 677 | nfs_mark_request_dirty(req); |
e7d39069 TM |
678 | nfs_clear_page_tag_locked(req); |
679 | return 0; | |
680 | } | |
681 | ||
1da177e4 LT |
682 | int nfs_flush_incompatible(struct file *file, struct page *page) |
683 | { | |
cd3758e3 | 684 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 685 | struct nfs_page *req; |
1a54533e | 686 | int do_flush, status; |
1da177e4 LT |
687 | /* |
688 | * Look for a request corresponding to this page. If there | |
689 | * is one, and it belongs to another file, we flush it out | |
690 | * before we try to copy anything into the page. Do this | |
691 | * due to the lack of an ACCESS-type call in NFSv2. | |
692 | * Also do the same if we find a request from an existing | |
693 | * dropped page. | |
694 | */ | |
1a54533e TM |
695 | do { |
696 | req = nfs_page_find_request(page); | |
697 | if (req == NULL) | |
698 | return 0; | |
f11ac8db TM |
699 | do_flush = req->wb_page != page || req->wb_context != ctx || |
700 | req->wb_lock_context->lockowner != current->files || | |
701 | req->wb_lock_context->pid != current->tgid; | |
1da177e4 | 702 | nfs_release_request(req); |
1a54533e TM |
703 | if (!do_flush) |
704 | return 0; | |
705 | status = nfs_wb_page(page->mapping->host, page); | |
706 | } while (status == 0); | |
707 | return status; | |
1da177e4 LT |
708 | } |
709 | ||
5d47a356 TM |
710 | /* |
711 | * If the page cache is marked as unsafe or invalid, then we can't rely on | |
712 | * the PageUptodate() flag. In this case, we will need to turn off | |
713 | * write optimisations that depend on the page contents being correct. | |
714 | */ | |
715 | static int nfs_write_pageuptodate(struct page *page, struct inode *inode) | |
716 | { | |
717 | return PageUptodate(page) && | |
718 | !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA)); | |
719 | } | |
720 | ||
1da177e4 LT |
721 | /* |
722 | * Update and possibly write a cached page of an NFS file. | |
723 | * | |
724 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
725 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
726 | */ | |
727 | int nfs_updatepage(struct file *file, struct page *page, | |
728 | unsigned int offset, unsigned int count) | |
729 | { | |
cd3758e3 | 730 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 731 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
732 | int status = 0; |
733 | ||
91d5b470 CL |
734 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
735 | ||
48186c7d | 736 | dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n", |
01cce933 JJS |
737 | file->f_path.dentry->d_parent->d_name.name, |
738 | file->f_path.dentry->d_name.name, count, | |
48186c7d | 739 | (long long)(page_offset(page) + offset)); |
1da177e4 | 740 | |
1da177e4 | 741 | /* If we're not using byte range locks, and we know the page |
5d47a356 TM |
742 | * is up to date, it may be more efficient to extend the write |
743 | * to cover the entire page in order to avoid fragmentation | |
744 | * inefficiencies. | |
1da177e4 | 745 | */ |
5d47a356 TM |
746 | if (nfs_write_pageuptodate(page, inode) && |
747 | inode->i_flock == NULL && | |
6b2f3d1f | 748 | !(file->f_flags & O_DSYNC)) { |
49a70f27 | 749 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 750 | offset = 0; |
1da177e4 LT |
751 | } |
752 | ||
e21195a7 | 753 | status = nfs_writepage_setup(ctx, page, offset, count); |
03fa9e84 TM |
754 | if (status < 0) |
755 | nfs_set_pageerror(page); | |
1da177e4 | 756 | |
48186c7d | 757 | dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n", |
1da177e4 | 758 | status, (long long)i_size_read(inode)); |
1da177e4 LT |
759 | return status; |
760 | } | |
761 | ||
762 | static void nfs_writepage_release(struct nfs_page *req) | |
763 | { | |
a6305ddb | 764 | struct page *page = req->wb_page; |
1da177e4 | 765 | |
a6305ddb | 766 | if (PageError(req->wb_page) || !nfs_reschedule_unstable_write(req)) |
8e821cad | 767 | nfs_inode_remove_request(req); |
9fd367f0 | 768 | nfs_clear_page_tag_locked(req); |
a6305ddb | 769 | nfs_end_page_writeback(page); |
1da177e4 LT |
770 | } |
771 | ||
3ff7576d | 772 | static int flush_task_priority(int how) |
1da177e4 LT |
773 | { |
774 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
775 | case FLUSH_HIGHPRI: | |
776 | return RPC_PRIORITY_HIGH; | |
777 | case FLUSH_LOWPRI: | |
778 | return RPC_PRIORITY_LOW; | |
779 | } | |
780 | return RPC_PRIORITY_NORMAL; | |
781 | } | |
782 | ||
783 | /* | |
784 | * Set up the argument/result storage required for the RPC call. | |
785 | */ | |
dbae4c73 | 786 | static int nfs_write_rpcsetup(struct nfs_page *req, |
1da177e4 | 787 | struct nfs_write_data *data, |
788e7a89 | 788 | const struct rpc_call_ops *call_ops, |
1da177e4 LT |
789 | unsigned int count, unsigned int offset, |
790 | int how) | |
791 | { | |
84115e1c | 792 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
3ff7576d | 793 | int priority = flush_task_priority(how); |
07737691 | 794 | struct rpc_task *task; |
bdc7f021 TM |
795 | struct rpc_message msg = { |
796 | .rpc_argp = &data->args, | |
797 | .rpc_resp = &data->res, | |
798 | .rpc_cred = req->wb_context->cred, | |
799 | }; | |
84115e1c TM |
800 | struct rpc_task_setup task_setup_data = { |
801 | .rpc_client = NFS_CLIENT(inode), | |
07737691 | 802 | .task = &data->task, |
bdc7f021 | 803 | .rpc_message = &msg, |
84115e1c TM |
804 | .callback_ops = call_ops, |
805 | .callback_data = data, | |
101070ca | 806 | .workqueue = nfsiod_workqueue, |
2c61be0a | 807 | .flags = RPC_TASK_ASYNC, |
3ff7576d | 808 | .priority = priority, |
84115e1c | 809 | }; |
2c61be0a | 810 | int ret = 0; |
1da177e4 LT |
811 | |
812 | /* Set up the RPC argument and reply structs | |
813 | * NB: take care not to mess about with data->commit et al. */ | |
814 | ||
815 | data->req = req; | |
88be9f99 | 816 | data->inode = inode = req->wb_context->path.dentry->d_inode; |
bdc7f021 | 817 | data->cred = msg.rpc_cred; |
1da177e4 LT |
818 | |
819 | data->args.fh = NFS_FH(inode); | |
820 | data->args.offset = req_offset(req) + offset; | |
821 | data->args.pgbase = req->wb_pgbase + offset; | |
822 | data->args.pages = data->pagevec; | |
823 | data->args.count = count; | |
383ba719 | 824 | data->args.context = get_nfs_open_context(req->wb_context); |
f11ac8db | 825 | data->args.lock_context = req->wb_lock_context; |
bdc7f021 TM |
826 | data->args.stable = NFS_UNSTABLE; |
827 | if (how & FLUSH_STABLE) { | |
828 | data->args.stable = NFS_DATA_SYNC; | |
fb8a1f11 | 829 | if (!nfs_need_commit(NFS_I(inode))) |
bdc7f021 TM |
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 | 841 | dprintk("NFS: %5u initiated write call " |
48186c7d | 842 | "(req %s/%lld, %u bytes @ offset %llu)\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 | 849 | task = rpc_run_task(&task_setup_data); |
2c61be0a TM |
850 | if (IS_ERR(task)) { |
851 | ret = PTR_ERR(task); | |
852 | goto out; | |
853 | } | |
854 | if (how & FLUSH_SYNC) { | |
855 | ret = rpc_wait_for_completion_task(task); | |
856 | if (ret == 0) | |
857 | ret = task->tk_status; | |
858 | } | |
dbae4c73 | 859 | rpc_put_task(task); |
2c61be0a TM |
860 | out: |
861 | return ret; | |
1da177e4 LT |
862 | } |
863 | ||
6d884e8f F |
864 | /* If a nfs_flush_* function fails, it should remove reqs from @head and |
865 | * call this on each, which will prepare them to be retried on next | |
866 | * writeback using standard nfs. | |
867 | */ | |
868 | static void nfs_redirty_request(struct nfs_page *req) | |
869 | { | |
a6305ddb TM |
870 | struct page *page = req->wb_page; |
871 | ||
6d884e8f | 872 | nfs_mark_request_dirty(req); |
6d884e8f | 873 | nfs_clear_page_tag_locked(req); |
a6305ddb | 874 | nfs_end_page_writeback(page); |
6d884e8f F |
875 | } |
876 | ||
1da177e4 LT |
877 | /* |
878 | * Generate multiple small requests to write out a single | |
879 | * contiguous dirty area on one page. | |
880 | */ | |
8d5658c9 | 881 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
882 | { |
883 | struct nfs_page *req = nfs_list_entry(head->next); | |
884 | struct page *page = req->wb_page; | |
885 | struct nfs_write_data *data; | |
e9f7bee1 TM |
886 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
887 | unsigned int offset; | |
1da177e4 | 888 | int requests = 0; |
dbae4c73 | 889 | int ret = 0; |
1da177e4 LT |
890 | LIST_HEAD(list); |
891 | ||
892 | nfs_list_remove_request(req); | |
893 | ||
bcb71bba | 894 | nbytes = count; |
e9f7bee1 TM |
895 | do { |
896 | size_t len = min(nbytes, wsize); | |
897 | ||
8d5658c9 | 898 | data = nfs_writedata_alloc(1); |
1da177e4 LT |
899 | if (!data) |
900 | goto out_bad; | |
901 | list_add(&data->pages, &list); | |
902 | requests++; | |
e9f7bee1 TM |
903 | nbytes -= len; |
904 | } while (nbytes != 0); | |
1da177e4 LT |
905 | atomic_set(&req->wb_complete, requests); |
906 | ||
907 | ClearPageError(page); | |
1da177e4 | 908 | offset = 0; |
bcb71bba | 909 | nbytes = count; |
1da177e4 | 910 | do { |
dbae4c73 TM |
911 | int ret2; |
912 | ||
1da177e4 LT |
913 | data = list_entry(list.next, struct nfs_write_data, pages); |
914 | list_del_init(&data->pages); | |
915 | ||
916 | data->pagevec[0] = page; | |
1da177e4 | 917 | |
bcb71bba TM |
918 | if (nbytes < wsize) |
919 | wsize = nbytes; | |
dbae4c73 | 920 | ret2 = nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
bcb71bba | 921 | wsize, offset, how); |
dbae4c73 TM |
922 | if (ret == 0) |
923 | ret = ret2; | |
bcb71bba TM |
924 | offset += wsize; |
925 | nbytes -= wsize; | |
1da177e4 LT |
926 | } while (nbytes != 0); |
927 | ||
dbae4c73 | 928 | return ret; |
1da177e4 LT |
929 | |
930 | out_bad: | |
931 | while (!list_empty(&list)) { | |
932 | data = list_entry(list.next, struct nfs_write_data, pages); | |
933 | list_del(&data->pages); | |
8aca67f0 | 934 | nfs_writedata_release(data); |
1da177e4 | 935 | } |
61822ab5 | 936 | nfs_redirty_request(req); |
1da177e4 LT |
937 | return -ENOMEM; |
938 | } | |
939 | ||
940 | /* | |
941 | * Create an RPC task for the given write request and kick it. | |
942 | * The page must have been locked by the caller. | |
943 | * | |
944 | * It may happen that the page we're passed is not marked dirty. | |
945 | * This is the case if nfs_updatepage detects a conflicting request | |
946 | * that has been written but not committed. | |
947 | */ | |
8d5658c9 | 948 | static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
949 | { |
950 | struct nfs_page *req; | |
951 | struct page **pages; | |
952 | struct nfs_write_data *data; | |
1da177e4 | 953 | |
8d5658c9 | 954 | data = nfs_writedata_alloc(npages); |
1da177e4 LT |
955 | if (!data) |
956 | goto out_bad; | |
957 | ||
958 | pages = data->pagevec; | |
1da177e4 LT |
959 | while (!list_empty(head)) { |
960 | req = nfs_list_entry(head->next); | |
961 | nfs_list_remove_request(req); | |
962 | nfs_list_add_request(req, &data->pages); | |
963 | ClearPageError(req->wb_page); | |
1da177e4 | 964 | *pages++ = req->wb_page; |
1da177e4 LT |
965 | } |
966 | req = nfs_list_entry(data->pages.next); | |
967 | ||
1da177e4 | 968 | /* Set up the argument struct */ |
dbae4c73 | 969 | return nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 LT |
970 | out_bad: |
971 | while (!list_empty(head)) { | |
10afec90 | 972 | req = nfs_list_entry(head->next); |
1da177e4 | 973 | nfs_list_remove_request(req); |
61822ab5 | 974 | nfs_redirty_request(req); |
1da177e4 LT |
975 | } |
976 | return -ENOMEM; | |
977 | } | |
978 | ||
c63c7b05 TM |
979 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, |
980 | struct inode *inode, int ioflags) | |
1da177e4 | 981 | { |
bf4285e7 | 982 | size_t wsize = NFS_SERVER(inode)->wsize; |
1da177e4 | 983 | |
bcb71bba | 984 | if (wsize < PAGE_CACHE_SIZE) |
c63c7b05 | 985 | nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); |
bcb71bba | 986 | else |
c63c7b05 | 987 | nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); |
1da177e4 LT |
988 | } |
989 | ||
990 | /* | |
991 | * Handle a write reply that flushed part of a page. | |
992 | */ | |
788e7a89 | 993 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 994 | { |
788e7a89 | 995 | struct nfs_write_data *data = calldata; |
1da177e4 | 996 | |
48186c7d CL |
997 | dprintk("NFS: %5u write(%s/%lld %d@%lld)", |
998 | task->tk_pid, | |
999 | data->req->wb_context->path.dentry->d_inode->i_sb->s_id, | |
1000 | (long long) | |
1001 | NFS_FILEID(data->req->wb_context->path.dentry->d_inode), | |
1002 | data->req->wb_bytes, (long long)req_offset(data->req)); | |
1da177e4 | 1003 | |
c9d8f89d TM |
1004 | nfs_writeback_done(task, data); |
1005 | } | |
788e7a89 | 1006 | |
c9d8f89d TM |
1007 | static void nfs_writeback_release_partial(void *calldata) |
1008 | { | |
1009 | struct nfs_write_data *data = calldata; | |
1010 | struct nfs_page *req = data->req; | |
1011 | struct page *page = req->wb_page; | |
1012 | int status = data->task.tk_status; | |
1013 | ||
1014 | if (status < 0) { | |
a301b777 | 1015 | nfs_set_pageerror(page); |
c9d8f89d TM |
1016 | nfs_context_set_write_error(req->wb_context, status); |
1017 | dprintk(", error = %d\n", status); | |
8e821cad | 1018 | goto out; |
1da177e4 LT |
1019 | } |
1020 | ||
8e821cad | 1021 | if (nfs_write_need_commit(data)) { |
587142f8 | 1022 | struct inode *inode = page->mapping->host; |
8e821cad | 1023 | |
587142f8 | 1024 | spin_lock(&inode->i_lock); |
8e821cad TM |
1025 | if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { |
1026 | /* Do nothing we need to resend the writes */ | |
1027 | } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
1028 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1029 | dprintk(" defer commit\n"); | |
1030 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
1031 | set_bit(PG_NEED_RESCHED, &req->wb_flags); | |
1032 | clear_bit(PG_NEED_COMMIT, &req->wb_flags); | |
1033 | dprintk(" server reboot detected\n"); | |
1034 | } | |
587142f8 | 1035 | spin_unlock(&inode->i_lock); |
8e821cad TM |
1036 | } else |
1037 | dprintk(" OK\n"); | |
1038 | ||
1039 | out: | |
1da177e4 LT |
1040 | if (atomic_dec_and_test(&req->wb_complete)) |
1041 | nfs_writepage_release(req); | |
c9d8f89d | 1042 | nfs_writedata_release(calldata); |
1da177e4 LT |
1043 | } |
1044 | ||
def6ed7e AA |
1045 | #if defined(CONFIG_NFS_V4_1) |
1046 | void nfs_write_prepare(struct rpc_task *task, void *calldata) | |
1047 | { | |
1048 | struct nfs_write_data *data = calldata; | |
def6ed7e | 1049 | |
035168ab TM |
1050 | if (nfs4_setup_sequence(NFS_SERVER(data->inode), |
1051 | &data->args.seq_args, | |
def6ed7e AA |
1052 | &data->res.seq_res, 1, task)) |
1053 | return; | |
1054 | rpc_call_start(task); | |
1055 | } | |
1056 | #endif /* CONFIG_NFS_V4_1 */ | |
1057 | ||
788e7a89 | 1058 | static const struct rpc_call_ops nfs_write_partial_ops = { |
def6ed7e AA |
1059 | #if defined(CONFIG_NFS_V4_1) |
1060 | .rpc_call_prepare = nfs_write_prepare, | |
1061 | #endif /* CONFIG_NFS_V4_1 */ | |
788e7a89 | 1062 | .rpc_call_done = nfs_writeback_done_partial, |
c9d8f89d | 1063 | .rpc_release = nfs_writeback_release_partial, |
788e7a89 TM |
1064 | }; |
1065 | ||
1da177e4 LT |
1066 | /* |
1067 | * Handle a write reply that flushes a whole page. | |
1068 | * | |
1069 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
1070 | * writebacks since the page->count is kept > 1 for as long | |
1071 | * as the page has a write request pending. | |
1072 | */ | |
788e7a89 | 1073 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 1074 | { |
788e7a89 | 1075 | struct nfs_write_data *data = calldata; |
1da177e4 | 1076 | |
c9d8f89d TM |
1077 | nfs_writeback_done(task, data); |
1078 | } | |
1079 | ||
1080 | static void nfs_writeback_release_full(void *calldata) | |
1081 | { | |
1082 | struct nfs_write_data *data = calldata; | |
1083 | int status = data->task.tk_status; | |
788e7a89 | 1084 | |
1da177e4 LT |
1085 | /* Update attributes as result of writeback. */ |
1086 | while (!list_empty(&data->pages)) { | |
c9d8f89d TM |
1087 | struct nfs_page *req = nfs_list_entry(data->pages.next); |
1088 | struct page *page = req->wb_page; | |
1089 | ||
1da177e4 | 1090 | nfs_list_remove_request(req); |
1da177e4 | 1091 | |
48186c7d CL |
1092 | dprintk("NFS: %5u write (%s/%lld %d@%lld)", |
1093 | data->task.tk_pid, | |
88be9f99 TM |
1094 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1095 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1096 | req->wb_bytes, |
1097 | (long long)req_offset(req)); | |
1098 | ||
c9d8f89d | 1099 | if (status < 0) { |
a301b777 | 1100 | nfs_set_pageerror(page); |
c9d8f89d TM |
1101 | nfs_context_set_write_error(req->wb_context, status); |
1102 | dprintk(", error = %d\n", status); | |
8e821cad | 1103 | goto remove_request; |
1da177e4 | 1104 | } |
1da177e4 | 1105 | |
8e821cad TM |
1106 | if (nfs_write_need_commit(data)) { |
1107 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1108 | nfs_mark_request_commit(req); | |
8e821cad | 1109 | dprintk(" marked for commit\n"); |
1da177e4 LT |
1110 | goto next; |
1111 | } | |
8e821cad TM |
1112 | dprintk(" OK\n"); |
1113 | remove_request: | |
1da177e4 | 1114 | nfs_inode_remove_request(req); |
1da177e4 | 1115 | next: |
9fd367f0 | 1116 | nfs_clear_page_tag_locked(req); |
a6305ddb | 1117 | nfs_end_page_writeback(page); |
1da177e4 | 1118 | } |
c9d8f89d | 1119 | nfs_writedata_release(calldata); |
1da177e4 LT |
1120 | } |
1121 | ||
788e7a89 | 1122 | static const struct rpc_call_ops nfs_write_full_ops = { |
def6ed7e AA |
1123 | #if defined(CONFIG_NFS_V4_1) |
1124 | .rpc_call_prepare = nfs_write_prepare, | |
1125 | #endif /* CONFIG_NFS_V4_1 */ | |
788e7a89 | 1126 | .rpc_call_done = nfs_writeback_done_full, |
c9d8f89d | 1127 | .rpc_release = nfs_writeback_release_full, |
788e7a89 TM |
1128 | }; |
1129 | ||
1130 | ||
1da177e4 LT |
1131 | /* |
1132 | * This function is called when the WRITE call is complete. | |
1133 | */ | |
462d5b32 | 1134 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1135 | { |
1da177e4 LT |
1136 | struct nfs_writeargs *argp = &data->args; |
1137 | struct nfs_writeres *resp = &data->res; | |
eedc020e | 1138 | struct nfs_server *server = NFS_SERVER(data->inode); |
788e7a89 | 1139 | int status; |
1da177e4 | 1140 | |
a3f565b1 | 1141 | dprintk("NFS: %5u nfs_writeback_done (status %d)\n", |
1da177e4 LT |
1142 | task->tk_pid, task->tk_status); |
1143 | ||
f551e44f CL |
1144 | /* |
1145 | * ->write_done will attempt to use post-op attributes to detect | |
1146 | * conflicting writes by other clients. A strict interpretation | |
1147 | * of close-to-open would allow us to continue caching even if | |
1148 | * another writer had changed the file, but some applications | |
1149 | * depend on tighter cache coherency when writing. | |
1150 | */ | |
788e7a89 TM |
1151 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1152 | if (status != 0) | |
1153 | return status; | |
91d5b470 CL |
1154 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1155 | ||
1da177e4 LT |
1156 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1157 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1158 | /* We tried a write call, but the server did not | |
1159 | * commit data to stable storage even though we | |
1160 | * requested it. | |
1161 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1162 | * the server reports NFS_DATA_SYNC, but performs | |
1163 | * NFS_FILE_SYNC. We therefore implement this checking | |
1164 | * as a dprintk() in order to avoid filling syslog. | |
1165 | */ | |
1166 | static unsigned long complain; | |
1167 | ||
1168 | if (time_before(complain, jiffies)) { | |
48186c7d | 1169 | dprintk("NFS: faulty NFS server %s:" |
1da177e4 | 1170 | " (committed = %d) != (stable = %d)\n", |
eedc020e | 1171 | server->nfs_client->cl_hostname, |
1da177e4 LT |
1172 | resp->verf->committed, argp->stable); |
1173 | complain = jiffies + 300 * HZ; | |
1174 | } | |
1175 | } | |
1176 | #endif | |
1177 | /* Is this a short write? */ | |
1178 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1179 | static unsigned long complain; | |
1180 | ||
91d5b470 CL |
1181 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1182 | ||
1da177e4 LT |
1183 | /* Has the server at least made some progress? */ |
1184 | if (resp->count != 0) { | |
1185 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1186 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1187 | /* Resend from where the server left off */ | |
1188 | argp->offset += resp->count; | |
1189 | argp->pgbase += resp->count; | |
1190 | argp->count -= resp->count; | |
1191 | } else { | |
1192 | /* Resend as a stable write in order to avoid | |
1193 | * headaches in the case of a server crash. | |
1194 | */ | |
1195 | argp->stable = NFS_FILE_SYNC; | |
1196 | } | |
0110ee15 | 1197 | nfs_restart_rpc(task, server->nfs_client); |
788e7a89 | 1198 | return -EAGAIN; |
1da177e4 LT |
1199 | } |
1200 | if (time_before(complain, jiffies)) { | |
1201 | printk(KERN_WARNING | |
1202 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1203 | argp->count); | |
1204 | complain = jiffies + 300 * HZ; | |
1205 | } | |
1206 | /* Can't do anything about it except throw an error. */ | |
1207 | task->tk_status = -EIO; | |
1208 | } | |
788e7a89 | 1209 | return 0; |
1da177e4 LT |
1210 | } |
1211 | ||
1212 | ||
1213 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
71d0a611 TM |
1214 | static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait) |
1215 | { | |
1216 | if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags)) | |
1217 | return 1; | |
1218 | if (may_wait && !out_of_line_wait_on_bit_lock(&nfsi->flags, | |
1219 | NFS_INO_COMMIT, nfs_wait_bit_killable, | |
1220 | TASK_KILLABLE)) | |
1221 | return 1; | |
1222 | return 0; | |
1223 | } | |
1224 | ||
1225 | static void nfs_commit_clear_lock(struct nfs_inode *nfsi) | |
1226 | { | |
1227 | clear_bit(NFS_INO_COMMIT, &nfsi->flags); | |
1228 | smp_mb__after_clear_bit(); | |
1229 | wake_up_bit(&nfsi->flags, NFS_INO_COMMIT); | |
1230 | } | |
1231 | ||
1232 | ||
0aa05887 | 1233 | static void nfs_commitdata_release(void *data) |
1da177e4 | 1234 | { |
383ba719 TM |
1235 | struct nfs_write_data *wdata = data; |
1236 | ||
1237 | put_nfs_open_context(wdata->args.context); | |
1da177e4 LT |
1238 | nfs_commit_free(wdata); |
1239 | } | |
1240 | ||
1241 | /* | |
1242 | * Set up the argument/result storage required for the RPC call. | |
1243 | */ | |
dbae4c73 | 1244 | static int nfs_commit_rpcsetup(struct list_head *head, |
788e7a89 TM |
1245 | struct nfs_write_data *data, |
1246 | int how) | |
1da177e4 | 1247 | { |
84115e1c TM |
1248 | struct nfs_page *first = nfs_list_entry(head->next); |
1249 | struct inode *inode = first->wb_context->path.dentry->d_inode; | |
3ff7576d | 1250 | int priority = flush_task_priority(how); |
07737691 | 1251 | struct rpc_task *task; |
bdc7f021 TM |
1252 | struct rpc_message msg = { |
1253 | .rpc_argp = &data->args, | |
1254 | .rpc_resp = &data->res, | |
1255 | .rpc_cred = first->wb_context->cred, | |
1256 | }; | |
84115e1c | 1257 | struct rpc_task_setup task_setup_data = { |
07737691 | 1258 | .task = &data->task, |
84115e1c | 1259 | .rpc_client = NFS_CLIENT(inode), |
bdc7f021 | 1260 | .rpc_message = &msg, |
84115e1c TM |
1261 | .callback_ops = &nfs_commit_ops, |
1262 | .callback_data = data, | |
101070ca | 1263 | .workqueue = nfsiod_workqueue, |
2c61be0a | 1264 | .flags = RPC_TASK_ASYNC, |
3ff7576d | 1265 | .priority = priority, |
84115e1c | 1266 | }; |
1da177e4 LT |
1267 | |
1268 | /* Set up the RPC argument and reply structs | |
1269 | * NB: take care not to mess about with data->commit et al. */ | |
1270 | ||
1271 | list_splice_init(head, &data->pages); | |
1da177e4 | 1272 | |
1da177e4 | 1273 | data->inode = inode; |
bdc7f021 | 1274 | data->cred = msg.rpc_cred; |
1da177e4 LT |
1275 | |
1276 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1277 | /* Note: we always request a commit of the entire inode */ |
1278 | data->args.offset = 0; | |
1279 | data->args.count = 0; | |
383ba719 | 1280 | data->args.context = get_nfs_open_context(first->wb_context); |
3da28eb1 | 1281 | data->res.count = 0; |
1da177e4 LT |
1282 | data->res.fattr = &data->fattr; |
1283 | data->res.verf = &data->verf; | |
0e574af1 | 1284 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1285 | |
1286 | /* Set up the initial task struct. */ | |
bdc7f021 | 1287 | NFS_PROTO(inode)->commit_setup(data, &msg); |
1da177e4 | 1288 | |
a3f565b1 | 1289 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); |
bdc7f021 | 1290 | |
07737691 | 1291 | task = rpc_run_task(&task_setup_data); |
dbae4c73 TM |
1292 | if (IS_ERR(task)) |
1293 | return PTR_ERR(task); | |
1294 | rpc_put_task(task); | |
1295 | return 0; | |
1da177e4 LT |
1296 | } |
1297 | ||
1298 | /* | |
1299 | * Commit dirty pages | |
1300 | */ | |
1301 | static int | |
40859d7e | 1302 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1303 | { |
1304 | struct nfs_write_data *data; | |
1305 | struct nfs_page *req; | |
1306 | ||
c9d8f89d | 1307 | data = nfs_commitdata_alloc(); |
1da177e4 LT |
1308 | |
1309 | if (!data) | |
1310 | goto out_bad; | |
1311 | ||
1312 | /* Set up the argument struct */ | |
dbae4c73 | 1313 | return nfs_commit_rpcsetup(head, data, how); |
1da177e4 LT |
1314 | out_bad: |
1315 | while (!list_empty(head)) { | |
1316 | req = nfs_list_entry(head->next); | |
1317 | nfs_list_remove_request(req); | |
1318 | nfs_mark_request_commit(req); | |
83715ad5 | 1319 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 PZ |
1320 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
1321 | BDI_RECLAIMABLE); | |
9fd367f0 | 1322 | nfs_clear_page_tag_locked(req); |
1da177e4 | 1323 | } |
71d0a611 | 1324 | nfs_commit_clear_lock(NFS_I(inode)); |
1da177e4 LT |
1325 | return -ENOMEM; |
1326 | } | |
1327 | ||
1328 | /* | |
1329 | * COMMIT call returned | |
1330 | */ | |
788e7a89 | 1331 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1332 | { |
963d8fe5 | 1333 | struct nfs_write_data *data = calldata; |
1da177e4 | 1334 | |
a3f565b1 | 1335 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
1da177e4 LT |
1336 | task->tk_pid, task->tk_status); |
1337 | ||
788e7a89 TM |
1338 | /* Call the NFS version-specific code */ |
1339 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1340 | return; | |
c9d8f89d TM |
1341 | } |
1342 | ||
1343 | static void nfs_commit_release(void *calldata) | |
1344 | { | |
1345 | struct nfs_write_data *data = calldata; | |
1346 | struct nfs_page *req; | |
1347 | int status = data->task.tk_status; | |
788e7a89 | 1348 | |
1da177e4 LT |
1349 | while (!list_empty(&data->pages)) { |
1350 | req = nfs_list_entry(data->pages.next); | |
1351 | nfs_list_remove_request(req); | |
e468bae9 | 1352 | nfs_clear_request_commit(req); |
1da177e4 | 1353 | |
48186c7d | 1354 | dprintk("NFS: commit (%s/%lld %d@%lld)", |
88be9f99 TM |
1355 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1356 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1357 | req->wb_bytes, |
1358 | (long long)req_offset(req)); | |
c9d8f89d TM |
1359 | if (status < 0) { |
1360 | nfs_context_set_write_error(req->wb_context, status); | |
1da177e4 | 1361 | nfs_inode_remove_request(req); |
c9d8f89d | 1362 | dprintk(", error = %d\n", status); |
1da177e4 LT |
1363 | goto next; |
1364 | } | |
1365 | ||
1366 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1367 | * returned by the server against all stored verfs. */ | |
1368 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1369 | /* We have a match */ | |
1370 | nfs_inode_remove_request(req); | |
1371 | dprintk(" OK\n"); | |
1372 | goto next; | |
1373 | } | |
1374 | /* We have a mismatch. Write the page again */ | |
1375 | dprintk(" mismatch\n"); | |
6d884e8f | 1376 | nfs_mark_request_dirty(req); |
1da177e4 | 1377 | next: |
9fd367f0 | 1378 | nfs_clear_page_tag_locked(req); |
1da177e4 | 1379 | } |
71d0a611 | 1380 | nfs_commit_clear_lock(NFS_I(data->inode)); |
c9d8f89d | 1381 | nfs_commitdata_release(calldata); |
1da177e4 | 1382 | } |
788e7a89 TM |
1383 | |
1384 | static const struct rpc_call_ops nfs_commit_ops = { | |
21d9a851 AA |
1385 | #if defined(CONFIG_NFS_V4_1) |
1386 | .rpc_call_prepare = nfs_write_prepare, | |
1387 | #endif /* CONFIG_NFS_V4_1 */ | |
788e7a89 TM |
1388 | .rpc_call_done = nfs_commit_done, |
1389 | .rpc_release = nfs_commit_release, | |
1390 | }; | |
1da177e4 | 1391 | |
b608b283 | 1392 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 | 1393 | { |
1da177e4 | 1394 | LIST_HEAD(head); |
71d0a611 TM |
1395 | int may_wait = how & FLUSH_SYNC; |
1396 | int res = 0; | |
1da177e4 | 1397 | |
71d0a611 | 1398 | if (!nfs_commit_set_lock(NFS_I(inode), may_wait)) |
c5efa5fc | 1399 | goto out_mark_dirty; |
587142f8 | 1400 | spin_lock(&inode->i_lock); |
3da28eb1 | 1401 | res = nfs_scan_commit(inode, &head, 0, 0); |
587142f8 | 1402 | spin_unlock(&inode->i_lock); |
1da177e4 | 1403 | if (res) { |
7d46a49f | 1404 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1405 | if (error < 0) |
1406 | return error; | |
71d0a611 TM |
1407 | if (may_wait) |
1408 | wait_on_bit(&NFS_I(inode)->flags, NFS_INO_COMMIT, | |
1409 | nfs_wait_bit_killable, | |
1410 | TASK_KILLABLE); | |
c5efa5fc TM |
1411 | else |
1412 | goto out_mark_dirty; | |
71d0a611 TM |
1413 | } else |
1414 | nfs_commit_clear_lock(NFS_I(inode)); | |
c5efa5fc TM |
1415 | return res; |
1416 | /* Note: If we exit without ensuring that the commit is complete, | |
1417 | * we must mark the inode as dirty. Otherwise, future calls to | |
1418 | * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure | |
1419 | * that the data is on the disk. | |
1420 | */ | |
1421 | out_mark_dirty: | |
1422 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); | |
1da177e4 LT |
1423 | return res; |
1424 | } | |
8fc795f7 TM |
1425 | |
1426 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) | |
1427 | { | |
420e3646 TM |
1428 | struct nfs_inode *nfsi = NFS_I(inode); |
1429 | int flags = FLUSH_SYNC; | |
1430 | int ret = 0; | |
8fc795f7 | 1431 | |
a00dd6c0 JL |
1432 | if (wbc->sync_mode == WB_SYNC_NONE) { |
1433 | /* Don't commit yet if this is a non-blocking flush and there | |
1434 | * are a lot of outstanding writes for this mapping. | |
1435 | */ | |
1436 | if (nfsi->ncommit <= (nfsi->npages >> 1)) | |
1437 | goto out_mark_dirty; | |
420e3646 | 1438 | |
a00dd6c0 | 1439 | /* don't wait for the COMMIT response */ |
420e3646 | 1440 | flags = 0; |
a00dd6c0 JL |
1441 | } |
1442 | ||
420e3646 TM |
1443 | ret = nfs_commit_inode(inode, flags); |
1444 | if (ret >= 0) { | |
1445 | if (wbc->sync_mode == WB_SYNC_NONE) { | |
1446 | if (ret < wbc->nr_to_write) | |
1447 | wbc->nr_to_write -= ret; | |
1448 | else | |
1449 | wbc->nr_to_write = 0; | |
1450 | } | |
8fc795f7 | 1451 | return 0; |
420e3646 TM |
1452 | } |
1453 | out_mark_dirty: | |
8fc795f7 TM |
1454 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1455 | return ret; | |
1456 | } | |
c63c7b05 | 1457 | #else |
8fc795f7 TM |
1458 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) |
1459 | { | |
1460 | return 0; | |
1461 | } | |
1da177e4 LT |
1462 | #endif |
1463 | ||
8fc795f7 TM |
1464 | int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1465 | { | |
1466 | return nfs_commit_unstable_pages(inode, wbc); | |
1467 | } | |
1468 | ||
acdc53b2 TM |
1469 | /* |
1470 | * flush the inode to disk. | |
1471 | */ | |
1472 | int nfs_wb_all(struct inode *inode) | |
34901f70 TM |
1473 | { |
1474 | struct writeback_control wbc = { | |
72cb77f4 | 1475 | .sync_mode = WB_SYNC_ALL, |
34901f70 | 1476 | .nr_to_write = LONG_MAX, |
d7fb1207 TM |
1477 | .range_start = 0, |
1478 | .range_end = LLONG_MAX, | |
34901f70 | 1479 | }; |
34901f70 | 1480 | |
acdc53b2 | 1481 | return sync_inode(inode, &wbc); |
1c75950b TM |
1482 | } |
1483 | ||
1b3b4a1a TM |
1484 | int nfs_wb_page_cancel(struct inode *inode, struct page *page) |
1485 | { | |
1486 | struct nfs_page *req; | |
1b3b4a1a TM |
1487 | int ret = 0; |
1488 | ||
1489 | BUG_ON(!PageLocked(page)); | |
1490 | for (;;) { | |
ba8b06e6 | 1491 | wait_on_page_writeback(page); |
1b3b4a1a TM |
1492 | req = nfs_page_find_request(page); |
1493 | if (req == NULL) | |
1b3b4a1a | 1494 | break; |
1b3b4a1a TM |
1495 | if (nfs_lock_request_dontget(req)) { |
1496 | nfs_inode_remove_request(req); | |
1497 | /* | |
1498 | * In case nfs_inode_remove_request has marked the | |
1499 | * page as being dirty | |
1500 | */ | |
1501 | cancel_dirty_page(page, PAGE_CACHE_SIZE); | |
1502 | nfs_unlock_request(req); | |
1503 | break; | |
1504 | } | |
1505 | ret = nfs_wait_on_request(req); | |
c9edda71 | 1506 | nfs_release_request(req); |
1b3b4a1a | 1507 | if (ret < 0) |
c988950e | 1508 | break; |
1b3b4a1a | 1509 | } |
1b3b4a1a TM |
1510 | return ret; |
1511 | } | |
1512 | ||
7f2f12d9 TM |
1513 | /* |
1514 | * Write back all requests on one page - we do this before reading it. | |
1515 | */ | |
1516 | int nfs_wb_page(struct inode *inode, struct page *page) | |
1c75950b TM |
1517 | { |
1518 | loff_t range_start = page_offset(page); | |
1519 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
4d770ccf | 1520 | struct writeback_control wbc = { |
4d770ccf | 1521 | .sync_mode = WB_SYNC_ALL, |
7f2f12d9 | 1522 | .nr_to_write = 0, |
4d770ccf TM |
1523 | .range_start = range_start, |
1524 | .range_end = range_end, | |
1525 | }; | |
1526 | int ret; | |
1c75950b | 1527 | |
0522f6ad | 1528 | for (;;) { |
ba8b06e6 | 1529 | wait_on_page_writeback(page); |
73e3302f TM |
1530 | if (clear_page_dirty_for_io(page)) { |
1531 | ret = nfs_writepage_locked(page, &wbc); | |
1532 | if (ret < 0) | |
1533 | goto out_error; | |
0522f6ad | 1534 | continue; |
7f2f12d9 | 1535 | } |
0522f6ad TM |
1536 | if (!PagePrivate(page)) |
1537 | break; | |
1538 | ret = nfs_commit_inode(inode, FLUSH_SYNC); | |
ba8b06e6 | 1539 | if (ret < 0) |
73e3302f | 1540 | goto out_error; |
7f2f12d9 | 1541 | } |
73e3302f TM |
1542 | return 0; |
1543 | out_error: | |
4d770ccf | 1544 | return ret; |
1c75950b TM |
1545 | } |
1546 | ||
074cc1de TM |
1547 | #ifdef CONFIG_MIGRATION |
1548 | int nfs_migrate_page(struct address_space *mapping, struct page *newpage, | |
1549 | struct page *page) | |
1550 | { | |
1551 | struct nfs_page *req; | |
1552 | int ret; | |
1553 | ||
7549ad5f | 1554 | nfs_fscache_release_page(page, GFP_KERNEL); |
074cc1de | 1555 | |
cfb506e1 | 1556 | req = nfs_find_and_lock_request(page, false); |
074cc1de TM |
1557 | ret = PTR_ERR(req); |
1558 | if (IS_ERR(req)) | |
1559 | goto out; | |
1560 | ||
1561 | ret = migrate_page(mapping, newpage, page); | |
1562 | if (!req) | |
1563 | goto out; | |
1564 | if (ret) | |
1565 | goto out_unlock; | |
1566 | page_cache_get(newpage); | |
190f38e5 | 1567 | spin_lock(&mapping->host->i_lock); |
074cc1de TM |
1568 | req->wb_page = newpage; |
1569 | SetPagePrivate(newpage); | |
190f38e5 | 1570 | set_page_private(newpage, (unsigned long)req); |
074cc1de TM |
1571 | ClearPagePrivate(page); |
1572 | set_page_private(page, 0); | |
190f38e5 | 1573 | spin_unlock(&mapping->host->i_lock); |
074cc1de TM |
1574 | page_cache_release(page); |
1575 | out_unlock: | |
1576 | nfs_clear_page_tag_locked(req); | |
074cc1de TM |
1577 | out: |
1578 | return ret; | |
1579 | } | |
1580 | #endif | |
1581 | ||
f7b422b1 | 1582 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1583 | { |
1584 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1585 | sizeof(struct nfs_write_data), | |
1586 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1587 | NULL); |
1da177e4 LT |
1588 | if (nfs_wdata_cachep == NULL) |
1589 | return -ENOMEM; | |
1590 | ||
93d2341c MD |
1591 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1592 | nfs_wdata_cachep); | |
1da177e4 LT |
1593 | if (nfs_wdata_mempool == NULL) |
1594 | return -ENOMEM; | |
1595 | ||
93d2341c MD |
1596 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1597 | nfs_wdata_cachep); | |
1da177e4 LT |
1598 | if (nfs_commit_mempool == NULL) |
1599 | return -ENOMEM; | |
1600 | ||
89a09141 PZ |
1601 | /* |
1602 | * NFS congestion size, scale with available memory. | |
1603 | * | |
1604 | * 64MB: 8192k | |
1605 | * 128MB: 11585k | |
1606 | * 256MB: 16384k | |
1607 | * 512MB: 23170k | |
1608 | * 1GB: 32768k | |
1609 | * 2GB: 46340k | |
1610 | * 4GB: 65536k | |
1611 | * 8GB: 92681k | |
1612 | * 16GB: 131072k | |
1613 | * | |
1614 | * This allows larger machines to have larger/more transfers. | |
1615 | * Limit the default to 256M | |
1616 | */ | |
1617 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); | |
1618 | if (nfs_congestion_kb > 256*1024) | |
1619 | nfs_congestion_kb = 256*1024; | |
1620 | ||
1da177e4 LT |
1621 | return 0; |
1622 | } | |
1623 | ||
266bee88 | 1624 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1625 | { |
1626 | mempool_destroy(nfs_commit_mempool); | |
1627 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1628 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1629 | } |
1630 |