Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/write.c | |
3 | * | |
7c85d900 | 4 | * Write file data over NFS. |
1da177e4 LT |
5 | * |
6 | * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de> | |
7 | */ | |
8 | ||
1da177e4 LT |
9 | #include <linux/types.h> |
10 | #include <linux/slab.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/pagemap.h> | |
13 | #include <linux/file.h> | |
1da177e4 | 14 | #include <linux/writeback.h> |
89a09141 | 15 | #include <linux/swap.h> |
074cc1de | 16 | #include <linux/migrate.h> |
1da177e4 LT |
17 | |
18 | #include <linux/sunrpc/clnt.h> | |
19 | #include <linux/nfs_fs.h> | |
20 | #include <linux/nfs_mount.h> | |
21 | #include <linux/nfs_page.h> | |
3fcfab16 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 | } | |
2df485a7 | 393 | set_bit(PG_MAPPED, &req->wb_flags); |
deb7d638 | 394 | SetPagePrivate(req->wb_page); |
277459d2 | 395 | set_page_private(req->wb_page, (unsigned long)req); |
1da177e4 | 396 | nfsi->npages++; |
c03b4024 | 397 | kref_get(&req->wb_kref); |
27852596 NP |
398 | radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, |
399 | NFS_PAGE_TAG_LOCKED); | |
e7d39069 TM |
400 | spin_unlock(&inode->i_lock); |
401 | radix_tree_preload_end(); | |
402 | out: | |
403 | return error; | |
1da177e4 LT |
404 | } |
405 | ||
406 | /* | |
89a09141 | 407 | * Remove a write request from an inode |
1da177e4 LT |
408 | */ |
409 | static void nfs_inode_remove_request(struct nfs_page *req) | |
410 | { | |
88be9f99 | 411 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
412 | struct nfs_inode *nfsi = NFS_I(inode); |
413 | ||
414 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
415 | ||
587142f8 | 416 | spin_lock(&inode->i_lock); |
277459d2 | 417 | set_page_private(req->wb_page, 0); |
deb7d638 | 418 | ClearPagePrivate(req->wb_page); |
2df485a7 | 419 | clear_bit(PG_MAPPED, &req->wb_flags); |
1da177e4 LT |
420 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
421 | nfsi->npages--; | |
422 | if (!nfsi->npages) { | |
587142f8 | 423 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
424 | iput(inode); |
425 | } else | |
587142f8 | 426 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
427 | nfs_release_request(req); |
428 | } | |
429 | ||
61822ab5 | 430 | static void |
6d884e8f | 431 | nfs_mark_request_dirty(struct nfs_page *req) |
61822ab5 | 432 | { |
61822ab5 | 433 | __set_page_dirty_nobuffers(req->wb_page); |
b80c3cb6 | 434 | __mark_inode_dirty(req->wb_page->mapping->host, I_DIRTY_DATASYNC); |
61822ab5 TM |
435 | } |
436 | ||
1da177e4 LT |
437 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
438 | /* | |
439 | * Add a request to the inode's commit list. | |
440 | */ | |
441 | static void | |
442 | nfs_mark_request_commit(struct nfs_page *req) | |
443 | { | |
88be9f99 | 444 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
445 | struct nfs_inode *nfsi = NFS_I(inode); |
446 | ||
587142f8 | 447 | spin_lock(&inode->i_lock); |
e468bae9 | 448 | set_bit(PG_CLEAN, &(req)->wb_flags); |
5c369683 TM |
449 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
450 | req->wb_index, | |
451 | NFS_PAGE_TAG_COMMIT); | |
ff778d02 | 452 | nfsi->ncommit++; |
587142f8 | 453 | spin_unlock(&inode->i_lock); |
fd39fc85 | 454 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 | 455 | inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE); |
a1803044 | 456 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1da177e4 | 457 | } |
8e821cad | 458 | |
e468bae9 TM |
459 | static int |
460 | nfs_clear_request_commit(struct nfs_page *req) | |
461 | { | |
462 | struct page *page = req->wb_page; | |
463 | ||
464 | if (test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) { | |
465 | dec_zone_page_state(page, NR_UNSTABLE_NFS); | |
466 | dec_bdi_stat(page->mapping->backing_dev_info, BDI_RECLAIMABLE); | |
467 | return 1; | |
468 | } | |
469 | return 0; | |
470 | } | |
471 | ||
8e821cad TM |
472 | static inline |
473 | int nfs_write_need_commit(struct nfs_write_data *data) | |
474 | { | |
475 | return data->verf.committed != NFS_FILE_SYNC; | |
476 | } | |
477 | ||
478 | static inline | |
479 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
480 | { | |
e468bae9 | 481 | if (test_and_clear_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
8e821cad TM |
482 | nfs_mark_request_commit(req); |
483 | return 1; | |
484 | } | |
485 | if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { | |
6d884e8f | 486 | nfs_mark_request_dirty(req); |
8e821cad TM |
487 | return 1; |
488 | } | |
489 | return 0; | |
490 | } | |
491 | #else | |
492 | static inline void | |
493 | nfs_mark_request_commit(struct nfs_page *req) | |
494 | { | |
495 | } | |
496 | ||
e468bae9 TM |
497 | static inline int |
498 | nfs_clear_request_commit(struct nfs_page *req) | |
499 | { | |
500 | return 0; | |
501 | } | |
502 | ||
8e821cad TM |
503 | static inline |
504 | int nfs_write_need_commit(struct nfs_write_data *data) | |
505 | { | |
506 | return 0; | |
507 | } | |
508 | ||
509 | static inline | |
510 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
511 | { | |
512 | return 0; | |
513 | } | |
1da177e4 LT |
514 | #endif |
515 | ||
47c62564 | 516 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
fb8a1f11 TM |
517 | static int |
518 | nfs_need_commit(struct nfs_inode *nfsi) | |
519 | { | |
520 | return radix_tree_tagged(&nfsi->nfs_page_tree, NFS_PAGE_TAG_COMMIT); | |
521 | } | |
522 | ||
1da177e4 LT |
523 | /* |
524 | * nfs_scan_commit - Scan an inode for commit requests | |
525 | * @inode: NFS inode to scan | |
526 | * @dst: destination list | |
527 | * @idx_start: lower bound of page->index to scan. | |
528 | * @npages: idx_start + npages sets the upper bound to scan. | |
529 | * | |
530 | * Moves requests from the inode's 'commit' request list. | |
531 | * The requests are *not* checked to ensure that they form a contiguous set. | |
532 | */ | |
533 | static int | |
ca52fec1 | 534 | nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
535 | { |
536 | struct nfs_inode *nfsi = NFS_I(inode); | |
ff778d02 | 537 | int ret; |
3da28eb1 | 538 | |
fb8a1f11 TM |
539 | if (!nfs_need_commit(nfsi)) |
540 | return 0; | |
541 | ||
ff778d02 TM |
542 | ret = nfs_scan_list(nfsi, dst, idx_start, npages, NFS_PAGE_TAG_COMMIT); |
543 | if (ret > 0) | |
544 | nfsi->ncommit -= ret; | |
2928db1f TM |
545 | if (nfs_need_commit(NFS_I(inode))) |
546 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); | |
ff778d02 | 547 | return ret; |
1da177e4 | 548 | } |
c42de9dd | 549 | #else |
fb8a1f11 TM |
550 | static inline int nfs_need_commit(struct nfs_inode *nfsi) |
551 | { | |
552 | return 0; | |
553 | } | |
554 | ||
ca52fec1 | 555 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
c42de9dd TM |
556 | { |
557 | return 0; | |
558 | } | |
1da177e4 LT |
559 | #endif |
560 | ||
1da177e4 | 561 | /* |
e7d39069 TM |
562 | * Search for an existing write request, and attempt to update |
563 | * it to reflect a new dirty region on a given page. | |
1da177e4 | 564 | * |
e7d39069 TM |
565 | * If the attempt fails, then the existing request is flushed out |
566 | * to disk. | |
1da177e4 | 567 | */ |
e7d39069 TM |
568 | static struct nfs_page *nfs_try_to_update_request(struct inode *inode, |
569 | struct page *page, | |
570 | unsigned int offset, | |
571 | unsigned int bytes) | |
1da177e4 | 572 | { |
e7d39069 TM |
573 | struct nfs_page *req; |
574 | unsigned int rqend; | |
575 | unsigned int end; | |
576 | int error; | |
577 | ||
578 | if (!PagePrivate(page)) | |
579 | return NULL; | |
1da177e4 LT |
580 | |
581 | end = offset + bytes; | |
e7d39069 | 582 | spin_lock(&inode->i_lock); |
1da177e4 | 583 | |
1da177e4 | 584 | for (;;) { |
277459d2 | 585 | req = nfs_page_find_request_locked(page); |
e7d39069 TM |
586 | if (req == NULL) |
587 | goto out_unlock; | |
588 | ||
589 | rqend = req->wb_offset + req->wb_bytes; | |
590 | /* | |
591 | * Tell the caller to flush out the request if | |
592 | * the offsets are non-contiguous. | |
593 | * Note: nfs_flush_incompatible() will already | |
594 | * have flushed out requests having wrong owners. | |
595 | */ | |
e468bae9 | 596 | if (offset > rqend |
e7d39069 TM |
597 | || end < req->wb_offset) |
598 | goto out_flushme; | |
599 | ||
600 | if (nfs_set_page_tag_locked(req)) | |
1da177e4 | 601 | break; |
1da177e4 | 602 | |
e7d39069 | 603 | /* The request is locked, so wait and then retry */ |
587142f8 | 604 | spin_unlock(&inode->i_lock); |
e7d39069 TM |
605 | error = nfs_wait_on_request(req); |
606 | nfs_release_request(req); | |
607 | if (error != 0) | |
608 | goto out_err; | |
609 | spin_lock(&inode->i_lock); | |
1da177e4 LT |
610 | } |
611 | ||
ff778d02 TM |
612 | if (nfs_clear_request_commit(req) && |
613 | radix_tree_tag_clear(&NFS_I(inode)->nfs_page_tree, | |
614 | req->wb_index, NFS_PAGE_TAG_COMMIT) != NULL) | |
615 | NFS_I(inode)->ncommit--; | |
e468bae9 | 616 | |
1da177e4 LT |
617 | /* Okay, the request matches. Update the region */ |
618 | if (offset < req->wb_offset) { | |
619 | req->wb_offset = offset; | |
620 | req->wb_pgbase = offset; | |
1da177e4 | 621 | } |
1da177e4 LT |
622 | if (end > rqend) |
623 | req->wb_bytes = end - req->wb_offset; | |
e7d39069 TM |
624 | else |
625 | req->wb_bytes = rqend - req->wb_offset; | |
626 | out_unlock: | |
627 | spin_unlock(&inode->i_lock); | |
628 | return req; | |
629 | out_flushme: | |
630 | spin_unlock(&inode->i_lock); | |
631 | nfs_release_request(req); | |
632 | error = nfs_wb_page(inode, page); | |
633 | out_err: | |
634 | return ERR_PTR(error); | |
635 | } | |
636 | ||
637 | /* | |
638 | * Try to update an existing write request, or create one if there is none. | |
639 | * | |
640 | * Note: Should always be called with the Page Lock held to prevent races | |
641 | * if we have to add a new request. Also assumes that the caller has | |
642 | * already called nfs_flush_incompatible() if necessary. | |
643 | */ | |
644 | static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx, | |
645 | struct page *page, unsigned int offset, unsigned int bytes) | |
646 | { | |
647 | struct inode *inode = page->mapping->host; | |
648 | struct nfs_page *req; | |
649 | int error; | |
1da177e4 | 650 | |
e7d39069 TM |
651 | req = nfs_try_to_update_request(inode, page, offset, bytes); |
652 | if (req != NULL) | |
653 | goto out; | |
654 | req = nfs_create_request(ctx, inode, page, offset, bytes); | |
655 | if (IS_ERR(req)) | |
656 | goto out; | |
657 | error = nfs_inode_add_request(inode, req); | |
658 | if (error != 0) { | |
659 | nfs_release_request(req); | |
660 | req = ERR_PTR(error); | |
661 | } | |
efc91ed0 | 662 | out: |
61e930a9 | 663 | return req; |
1da177e4 LT |
664 | } |
665 | ||
e7d39069 TM |
666 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
667 | unsigned int offset, unsigned int count) | |
668 | { | |
669 | struct nfs_page *req; | |
670 | ||
671 | req = nfs_setup_write_request(ctx, page, offset, count); | |
672 | if (IS_ERR(req)) | |
673 | return PTR_ERR(req); | |
b80c3cb6 | 674 | nfs_mark_request_dirty(req); |
e7d39069 TM |
675 | /* Update file length */ |
676 | nfs_grow_file(page, offset, count); | |
677 | nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); | |
a6305ddb | 678 | nfs_mark_request_dirty(req); |
e7d39069 TM |
679 | nfs_clear_page_tag_locked(req); |
680 | return 0; | |
681 | } | |
682 | ||
1da177e4 LT |
683 | int nfs_flush_incompatible(struct file *file, struct page *page) |
684 | { | |
cd3758e3 | 685 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 686 | struct nfs_page *req; |
1a54533e | 687 | int do_flush, status; |
1da177e4 LT |
688 | /* |
689 | * Look for a request corresponding to this page. If there | |
690 | * is one, and it belongs to another file, we flush it out | |
691 | * before we try to copy anything into the page. Do this | |
692 | * due to the lack of an ACCESS-type call in NFSv2. | |
693 | * Also do the same if we find a request from an existing | |
694 | * dropped page. | |
695 | */ | |
1a54533e TM |
696 | do { |
697 | req = nfs_page_find_request(page); | |
698 | if (req == NULL) | |
699 | return 0; | |
f11ac8db TM |
700 | do_flush = req->wb_page != page || req->wb_context != ctx || |
701 | req->wb_lock_context->lockowner != current->files || | |
702 | req->wb_lock_context->pid != current->tgid; | |
1da177e4 | 703 | nfs_release_request(req); |
1a54533e TM |
704 | if (!do_flush) |
705 | return 0; | |
706 | status = nfs_wb_page(page->mapping->host, page); | |
707 | } while (status == 0); | |
708 | return status; | |
1da177e4 LT |
709 | } |
710 | ||
5d47a356 TM |
711 | /* |
712 | * If the page cache is marked as unsafe or invalid, then we can't rely on | |
713 | * the PageUptodate() flag. In this case, we will need to turn off | |
714 | * write optimisations that depend on the page contents being correct. | |
715 | */ | |
716 | static int nfs_write_pageuptodate(struct page *page, struct inode *inode) | |
717 | { | |
718 | return PageUptodate(page) && | |
719 | !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA)); | |
720 | } | |
721 | ||
1da177e4 LT |
722 | /* |
723 | * Update and possibly write a cached page of an NFS file. | |
724 | * | |
725 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
726 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
727 | */ | |
728 | int nfs_updatepage(struct file *file, struct page *page, | |
729 | unsigned int offset, unsigned int count) | |
730 | { | |
cd3758e3 | 731 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 732 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
733 | int status = 0; |
734 | ||
91d5b470 CL |
735 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
736 | ||
48186c7d | 737 | dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n", |
01cce933 JJS |
738 | file->f_path.dentry->d_parent->d_name.name, |
739 | file->f_path.dentry->d_name.name, count, | |
48186c7d | 740 | (long long)(page_offset(page) + offset)); |
1da177e4 | 741 | |
1da177e4 | 742 | /* If we're not using byte range locks, and we know the page |
5d47a356 TM |
743 | * is up to date, it may be more efficient to extend the write |
744 | * to cover the entire page in order to avoid fragmentation | |
745 | * inefficiencies. | |
1da177e4 | 746 | */ |
5d47a356 TM |
747 | if (nfs_write_pageuptodate(page, inode) && |
748 | inode->i_flock == NULL && | |
6b2f3d1f | 749 | !(file->f_flags & O_DSYNC)) { |
49a70f27 | 750 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 751 | offset = 0; |
1da177e4 LT |
752 | } |
753 | ||
e21195a7 | 754 | status = nfs_writepage_setup(ctx, page, offset, count); |
03fa9e84 TM |
755 | if (status < 0) |
756 | nfs_set_pageerror(page); | |
1da177e4 | 757 | |
48186c7d | 758 | dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n", |
1da177e4 | 759 | status, (long long)i_size_read(inode)); |
1da177e4 LT |
760 | return status; |
761 | } | |
762 | ||
763 | static void nfs_writepage_release(struct nfs_page *req) | |
764 | { | |
a6305ddb | 765 | struct page *page = req->wb_page; |
1da177e4 | 766 | |
a6305ddb | 767 | if (PageError(req->wb_page) || !nfs_reschedule_unstable_write(req)) |
8e821cad | 768 | nfs_inode_remove_request(req); |
9fd367f0 | 769 | nfs_clear_page_tag_locked(req); |
a6305ddb | 770 | nfs_end_page_writeback(page); |
1da177e4 LT |
771 | } |
772 | ||
3ff7576d | 773 | static int flush_task_priority(int how) |
1da177e4 LT |
774 | { |
775 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
776 | case FLUSH_HIGHPRI: | |
777 | return RPC_PRIORITY_HIGH; | |
778 | case FLUSH_LOWPRI: | |
779 | return RPC_PRIORITY_LOW; | |
780 | } | |
781 | return RPC_PRIORITY_NORMAL; | |
782 | } | |
783 | ||
784 | /* | |
785 | * Set up the argument/result storage required for the RPC call. | |
786 | */ | |
dbae4c73 | 787 | static int nfs_write_rpcsetup(struct nfs_page *req, |
1da177e4 | 788 | struct nfs_write_data *data, |
788e7a89 | 789 | const struct rpc_call_ops *call_ops, |
1da177e4 LT |
790 | unsigned int count, unsigned int offset, |
791 | int how) | |
792 | { | |
84115e1c | 793 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
3ff7576d | 794 | int priority = flush_task_priority(how); |
07737691 | 795 | struct rpc_task *task; |
bdc7f021 TM |
796 | struct rpc_message msg = { |
797 | .rpc_argp = &data->args, | |
798 | .rpc_resp = &data->res, | |
799 | .rpc_cred = req->wb_context->cred, | |
800 | }; | |
84115e1c TM |
801 | struct rpc_task_setup task_setup_data = { |
802 | .rpc_client = NFS_CLIENT(inode), | |
07737691 | 803 | .task = &data->task, |
bdc7f021 | 804 | .rpc_message = &msg, |
84115e1c TM |
805 | .callback_ops = call_ops, |
806 | .callback_data = data, | |
101070ca | 807 | .workqueue = nfsiod_workqueue, |
2c61be0a | 808 | .flags = RPC_TASK_ASYNC, |
3ff7576d | 809 | .priority = priority, |
84115e1c | 810 | }; |
2c61be0a | 811 | int ret = 0; |
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; | |
383ba719 | 825 | data->args.context = get_nfs_open_context(req->wb_context); |
f11ac8db | 826 | data->args.lock_context = req->wb_lock_context; |
bdc7f021 TM |
827 | data->args.stable = NFS_UNSTABLE; |
828 | if (how & FLUSH_STABLE) { | |
829 | data->args.stable = NFS_DATA_SYNC; | |
fb8a1f11 | 830 | if (!nfs_need_commit(NFS_I(inode))) |
bdc7f021 TM |
831 | data->args.stable = NFS_FILE_SYNC; |
832 | } | |
1da177e4 LT |
833 | |
834 | data->res.fattr = &data->fattr; | |
835 | data->res.count = count; | |
836 | data->res.verf = &data->verf; | |
0e574af1 | 837 | nfs_fattr_init(&data->fattr); |
1da177e4 | 838 | |
788e7a89 | 839 | /* Set up the initial task struct. */ |
bdc7f021 | 840 | NFS_PROTO(inode)->write_setup(data, &msg); |
1da177e4 | 841 | |
a3f565b1 | 842 | dprintk("NFS: %5u initiated write call " |
48186c7d | 843 | "(req %s/%lld, %u bytes @ offset %llu)\n", |
0bbacc40 | 844 | data->task.tk_pid, |
1da177e4 LT |
845 | inode->i_sb->s_id, |
846 | (long long)NFS_FILEID(inode), | |
847 | count, | |
848 | (unsigned long long)data->args.offset); | |
1da177e4 | 849 | |
07737691 | 850 | task = rpc_run_task(&task_setup_data); |
2c61be0a TM |
851 | if (IS_ERR(task)) { |
852 | ret = PTR_ERR(task); | |
853 | goto out; | |
854 | } | |
855 | if (how & FLUSH_SYNC) { | |
856 | ret = rpc_wait_for_completion_task(task); | |
857 | if (ret == 0) | |
858 | ret = task->tk_status; | |
859 | } | |
dbae4c73 | 860 | rpc_put_task(task); |
2c61be0a TM |
861 | out: |
862 | return ret; | |
1da177e4 LT |
863 | } |
864 | ||
6d884e8f F |
865 | /* If a nfs_flush_* function fails, it should remove reqs from @head and |
866 | * call this on each, which will prepare them to be retried on next | |
867 | * writeback using standard nfs. | |
868 | */ | |
869 | static void nfs_redirty_request(struct nfs_page *req) | |
870 | { | |
a6305ddb TM |
871 | struct page *page = req->wb_page; |
872 | ||
6d884e8f | 873 | nfs_mark_request_dirty(req); |
6d884e8f | 874 | nfs_clear_page_tag_locked(req); |
a6305ddb | 875 | nfs_end_page_writeback(page); |
6d884e8f F |
876 | } |
877 | ||
1da177e4 LT |
878 | /* |
879 | * Generate multiple small requests to write out a single | |
880 | * contiguous dirty area on one page. | |
881 | */ | |
8d5658c9 | 882 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
883 | { |
884 | struct nfs_page *req = nfs_list_entry(head->next); | |
885 | struct page *page = req->wb_page; | |
886 | struct nfs_write_data *data; | |
e9f7bee1 TM |
887 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
888 | unsigned int offset; | |
1da177e4 | 889 | int requests = 0; |
dbae4c73 | 890 | int ret = 0; |
1da177e4 LT |
891 | LIST_HEAD(list); |
892 | ||
893 | nfs_list_remove_request(req); | |
894 | ||
bcb71bba | 895 | nbytes = count; |
e9f7bee1 TM |
896 | do { |
897 | size_t len = min(nbytes, wsize); | |
898 | ||
8d5658c9 | 899 | data = nfs_writedata_alloc(1); |
1da177e4 LT |
900 | if (!data) |
901 | goto out_bad; | |
902 | list_add(&data->pages, &list); | |
903 | requests++; | |
e9f7bee1 TM |
904 | nbytes -= len; |
905 | } while (nbytes != 0); | |
1da177e4 LT |
906 | atomic_set(&req->wb_complete, requests); |
907 | ||
908 | ClearPageError(page); | |
1da177e4 | 909 | offset = 0; |
bcb71bba | 910 | nbytes = count; |
1da177e4 | 911 | do { |
dbae4c73 TM |
912 | int ret2; |
913 | ||
1da177e4 LT |
914 | data = list_entry(list.next, struct nfs_write_data, pages); |
915 | list_del_init(&data->pages); | |
916 | ||
917 | data->pagevec[0] = page; | |
1da177e4 | 918 | |
bcb71bba TM |
919 | if (nbytes < wsize) |
920 | wsize = nbytes; | |
dbae4c73 | 921 | ret2 = nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
bcb71bba | 922 | wsize, offset, how); |
dbae4c73 TM |
923 | if (ret == 0) |
924 | ret = ret2; | |
bcb71bba TM |
925 | offset += wsize; |
926 | nbytes -= wsize; | |
1da177e4 LT |
927 | } while (nbytes != 0); |
928 | ||
dbae4c73 | 929 | return ret; |
1da177e4 LT |
930 | |
931 | out_bad: | |
932 | while (!list_empty(&list)) { | |
933 | data = list_entry(list.next, struct nfs_write_data, pages); | |
934 | list_del(&data->pages); | |
0da2a4ac | 935 | nfs_writedata_free(data); |
1da177e4 | 936 | } |
61822ab5 | 937 | nfs_redirty_request(req); |
1da177e4 LT |
938 | return -ENOMEM; |
939 | } | |
940 | ||
941 | /* | |
942 | * Create an RPC task for the given write request and kick it. | |
943 | * The page must have been locked by the caller. | |
944 | * | |
945 | * It may happen that the page we're passed is not marked dirty. | |
946 | * This is the case if nfs_updatepage detects a conflicting request | |
947 | * that has been written but not committed. | |
948 | */ | |
8d5658c9 | 949 | static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
950 | { |
951 | struct nfs_page *req; | |
952 | struct page **pages; | |
953 | struct nfs_write_data *data; | |
1da177e4 | 954 | |
8d5658c9 | 955 | data = nfs_writedata_alloc(npages); |
1da177e4 LT |
956 | if (!data) |
957 | goto out_bad; | |
958 | ||
959 | pages = data->pagevec; | |
1da177e4 LT |
960 | while (!list_empty(head)) { |
961 | req = nfs_list_entry(head->next); | |
962 | nfs_list_remove_request(req); | |
963 | nfs_list_add_request(req, &data->pages); | |
964 | ClearPageError(req->wb_page); | |
1da177e4 | 965 | *pages++ = req->wb_page; |
1da177e4 LT |
966 | } |
967 | req = nfs_list_entry(data->pages.next); | |
968 | ||
1da177e4 | 969 | /* Set up the argument struct */ |
dbae4c73 | 970 | return nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 LT |
971 | out_bad: |
972 | while (!list_empty(head)) { | |
10afec90 | 973 | req = nfs_list_entry(head->next); |
1da177e4 | 974 | nfs_list_remove_request(req); |
61822ab5 | 975 | nfs_redirty_request(req); |
1da177e4 LT |
976 | } |
977 | return -ENOMEM; | |
978 | } | |
979 | ||
c63c7b05 TM |
980 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, |
981 | struct inode *inode, int ioflags) | |
1da177e4 | 982 | { |
bf4285e7 | 983 | size_t wsize = NFS_SERVER(inode)->wsize; |
1da177e4 | 984 | |
bcb71bba | 985 | if (wsize < PAGE_CACHE_SIZE) |
c63c7b05 | 986 | nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); |
bcb71bba | 987 | else |
c63c7b05 | 988 | nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); |
1da177e4 LT |
989 | } |
990 | ||
991 | /* | |
992 | * Handle a write reply that flushed part of a page. | |
993 | */ | |
788e7a89 | 994 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 995 | { |
788e7a89 | 996 | struct nfs_write_data *data = calldata; |
1da177e4 | 997 | |
48186c7d CL |
998 | dprintk("NFS: %5u write(%s/%lld %d@%lld)", |
999 | task->tk_pid, | |
1000 | data->req->wb_context->path.dentry->d_inode->i_sb->s_id, | |
1001 | (long long) | |
1002 | NFS_FILEID(data->req->wb_context->path.dentry->d_inode), | |
1003 | data->req->wb_bytes, (long long)req_offset(data->req)); | |
1da177e4 | 1004 | |
c9d8f89d TM |
1005 | nfs_writeback_done(task, data); |
1006 | } | |
788e7a89 | 1007 | |
c9d8f89d TM |
1008 | static void nfs_writeback_release_partial(void *calldata) |
1009 | { | |
1010 | struct nfs_write_data *data = calldata; | |
1011 | struct nfs_page *req = data->req; | |
1012 | struct page *page = req->wb_page; | |
1013 | int status = data->task.tk_status; | |
1014 | ||
1015 | if (status < 0) { | |
a301b777 | 1016 | nfs_set_pageerror(page); |
c9d8f89d TM |
1017 | nfs_context_set_write_error(req->wb_context, status); |
1018 | dprintk(", error = %d\n", status); | |
8e821cad | 1019 | goto out; |
1da177e4 LT |
1020 | } |
1021 | ||
8e821cad | 1022 | if (nfs_write_need_commit(data)) { |
587142f8 | 1023 | struct inode *inode = page->mapping->host; |
8e821cad | 1024 | |
587142f8 | 1025 | spin_lock(&inode->i_lock); |
8e821cad TM |
1026 | if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { |
1027 | /* Do nothing we need to resend the writes */ | |
1028 | } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
1029 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1030 | dprintk(" defer commit\n"); | |
1031 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
1032 | set_bit(PG_NEED_RESCHED, &req->wb_flags); | |
1033 | clear_bit(PG_NEED_COMMIT, &req->wb_flags); | |
1034 | dprintk(" server reboot detected\n"); | |
1035 | } | |
587142f8 | 1036 | spin_unlock(&inode->i_lock); |
8e821cad TM |
1037 | } else |
1038 | dprintk(" OK\n"); | |
1039 | ||
1040 | out: | |
1da177e4 LT |
1041 | if (atomic_dec_and_test(&req->wb_complete)) |
1042 | nfs_writepage_release(req); | |
c9d8f89d | 1043 | nfs_writedata_release(calldata); |
1da177e4 LT |
1044 | } |
1045 | ||
def6ed7e AA |
1046 | #if defined(CONFIG_NFS_V4_1) |
1047 | void nfs_write_prepare(struct rpc_task *task, void *calldata) | |
1048 | { | |
1049 | struct nfs_write_data *data = calldata; | |
def6ed7e | 1050 | |
035168ab TM |
1051 | if (nfs4_setup_sequence(NFS_SERVER(data->inode), |
1052 | &data->args.seq_args, | |
def6ed7e AA |
1053 | &data->res.seq_res, 1, task)) |
1054 | return; | |
1055 | rpc_call_start(task); | |
1056 | } | |
1057 | #endif /* CONFIG_NFS_V4_1 */ | |
1058 | ||
788e7a89 | 1059 | static const struct rpc_call_ops nfs_write_partial_ops = { |
def6ed7e AA |
1060 | #if defined(CONFIG_NFS_V4_1) |
1061 | .rpc_call_prepare = nfs_write_prepare, | |
1062 | #endif /* CONFIG_NFS_V4_1 */ | |
788e7a89 | 1063 | .rpc_call_done = nfs_writeback_done_partial, |
c9d8f89d | 1064 | .rpc_release = nfs_writeback_release_partial, |
788e7a89 TM |
1065 | }; |
1066 | ||
1da177e4 LT |
1067 | /* |
1068 | * Handle a write reply that flushes a whole page. | |
1069 | * | |
1070 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
1071 | * writebacks since the page->count is kept > 1 for as long | |
1072 | * as the page has a write request pending. | |
1073 | */ | |
788e7a89 | 1074 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 1075 | { |
788e7a89 | 1076 | struct nfs_write_data *data = calldata; |
1da177e4 | 1077 | |
c9d8f89d TM |
1078 | nfs_writeback_done(task, data); |
1079 | } | |
1080 | ||
1081 | static void nfs_writeback_release_full(void *calldata) | |
1082 | { | |
1083 | struct nfs_write_data *data = calldata; | |
1084 | int status = data->task.tk_status; | |
788e7a89 | 1085 | |
1da177e4 LT |
1086 | /* Update attributes as result of writeback. */ |
1087 | while (!list_empty(&data->pages)) { | |
c9d8f89d TM |
1088 | struct nfs_page *req = nfs_list_entry(data->pages.next); |
1089 | struct page *page = req->wb_page; | |
1090 | ||
1da177e4 | 1091 | nfs_list_remove_request(req); |
1da177e4 | 1092 | |
48186c7d CL |
1093 | dprintk("NFS: %5u write (%s/%lld %d@%lld)", |
1094 | data->task.tk_pid, | |
88be9f99 TM |
1095 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1096 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1097 | req->wb_bytes, |
1098 | (long long)req_offset(req)); | |
1099 | ||
c9d8f89d | 1100 | if (status < 0) { |
a301b777 | 1101 | nfs_set_pageerror(page); |
c9d8f89d TM |
1102 | nfs_context_set_write_error(req->wb_context, status); |
1103 | dprintk(", error = %d\n", status); | |
8e821cad | 1104 | goto remove_request; |
1da177e4 | 1105 | } |
1da177e4 | 1106 | |
8e821cad TM |
1107 | if (nfs_write_need_commit(data)) { |
1108 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1109 | nfs_mark_request_commit(req); | |
8e821cad | 1110 | dprintk(" marked for commit\n"); |
1da177e4 LT |
1111 | goto next; |
1112 | } | |
8e821cad TM |
1113 | dprintk(" OK\n"); |
1114 | remove_request: | |
1da177e4 | 1115 | nfs_inode_remove_request(req); |
1da177e4 | 1116 | next: |
9fd367f0 | 1117 | nfs_clear_page_tag_locked(req); |
a6305ddb | 1118 | nfs_end_page_writeback(page); |
1da177e4 | 1119 | } |
c9d8f89d | 1120 | nfs_writedata_release(calldata); |
1da177e4 LT |
1121 | } |
1122 | ||
788e7a89 | 1123 | static const struct rpc_call_ops nfs_write_full_ops = { |
def6ed7e AA |
1124 | #if defined(CONFIG_NFS_V4_1) |
1125 | .rpc_call_prepare = nfs_write_prepare, | |
1126 | #endif /* CONFIG_NFS_V4_1 */ | |
788e7a89 | 1127 | .rpc_call_done = nfs_writeback_done_full, |
c9d8f89d | 1128 | .rpc_release = nfs_writeback_release_full, |
788e7a89 TM |
1129 | }; |
1130 | ||
1131 | ||
1da177e4 LT |
1132 | /* |
1133 | * This function is called when the WRITE call is complete. | |
1134 | */ | |
462d5b32 | 1135 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1136 | { |
1da177e4 LT |
1137 | struct nfs_writeargs *argp = &data->args; |
1138 | struct nfs_writeres *resp = &data->res; | |
eedc020e | 1139 | struct nfs_server *server = NFS_SERVER(data->inode); |
788e7a89 | 1140 | int status; |
1da177e4 | 1141 | |
a3f565b1 | 1142 | dprintk("NFS: %5u nfs_writeback_done (status %d)\n", |
1da177e4 LT |
1143 | task->tk_pid, task->tk_status); |
1144 | ||
f551e44f CL |
1145 | /* |
1146 | * ->write_done will attempt to use post-op attributes to detect | |
1147 | * conflicting writes by other clients. A strict interpretation | |
1148 | * of close-to-open would allow us to continue caching even if | |
1149 | * another writer had changed the file, but some applications | |
1150 | * depend on tighter cache coherency when writing. | |
1151 | */ | |
788e7a89 TM |
1152 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1153 | if (status != 0) | |
1154 | return status; | |
91d5b470 CL |
1155 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1156 | ||
1da177e4 LT |
1157 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1158 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1159 | /* We tried a write call, but the server did not | |
1160 | * commit data to stable storage even though we | |
1161 | * requested it. | |
1162 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1163 | * the server reports NFS_DATA_SYNC, but performs | |
1164 | * NFS_FILE_SYNC. We therefore implement this checking | |
1165 | * as a dprintk() in order to avoid filling syslog. | |
1166 | */ | |
1167 | static unsigned long complain; | |
1168 | ||
1169 | if (time_before(complain, jiffies)) { | |
48186c7d | 1170 | dprintk("NFS: faulty NFS server %s:" |
1da177e4 | 1171 | " (committed = %d) != (stable = %d)\n", |
eedc020e | 1172 | server->nfs_client->cl_hostname, |
1da177e4 LT |
1173 | resp->verf->committed, argp->stable); |
1174 | complain = jiffies + 300 * HZ; | |
1175 | } | |
1176 | } | |
1177 | #endif | |
1178 | /* Is this a short write? */ | |
1179 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1180 | static unsigned long complain; | |
1181 | ||
91d5b470 CL |
1182 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1183 | ||
1da177e4 LT |
1184 | /* Has the server at least made some progress? */ |
1185 | if (resp->count != 0) { | |
1186 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1187 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1188 | /* Resend from where the server left off */ | |
1189 | argp->offset += resp->count; | |
1190 | argp->pgbase += resp->count; | |
1191 | argp->count -= resp->count; | |
1192 | } else { | |
1193 | /* Resend as a stable write in order to avoid | |
1194 | * headaches in the case of a server crash. | |
1195 | */ | |
1196 | argp->stable = NFS_FILE_SYNC; | |
1197 | } | |
0110ee15 | 1198 | nfs_restart_rpc(task, server->nfs_client); |
788e7a89 | 1199 | return -EAGAIN; |
1da177e4 LT |
1200 | } |
1201 | if (time_before(complain, jiffies)) { | |
1202 | printk(KERN_WARNING | |
1203 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1204 | argp->count); | |
1205 | complain = jiffies + 300 * HZ; | |
1206 | } | |
1207 | /* Can't do anything about it except throw an error. */ | |
1208 | task->tk_status = -EIO; | |
1209 | } | |
788e7a89 | 1210 | return 0; |
1da177e4 LT |
1211 | } |
1212 | ||
1213 | ||
1214 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
71d0a611 TM |
1215 | static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait) |
1216 | { | |
1217 | if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags)) | |
1218 | return 1; | |
1219 | if (may_wait && !out_of_line_wait_on_bit_lock(&nfsi->flags, | |
1220 | NFS_INO_COMMIT, nfs_wait_bit_killable, | |
1221 | TASK_KILLABLE)) | |
1222 | return 1; | |
1223 | return 0; | |
1224 | } | |
1225 | ||
1226 | static void nfs_commit_clear_lock(struct nfs_inode *nfsi) | |
1227 | { | |
1228 | clear_bit(NFS_INO_COMMIT, &nfsi->flags); | |
1229 | smp_mb__after_clear_bit(); | |
1230 | wake_up_bit(&nfsi->flags, NFS_INO_COMMIT); | |
1231 | } | |
1232 | ||
1233 | ||
0aa05887 | 1234 | static void nfs_commitdata_release(void *data) |
1da177e4 | 1235 | { |
383ba719 TM |
1236 | struct nfs_write_data *wdata = data; |
1237 | ||
1238 | put_nfs_open_context(wdata->args.context); | |
1da177e4 LT |
1239 | nfs_commit_free(wdata); |
1240 | } | |
1241 | ||
1242 | /* | |
1243 | * Set up the argument/result storage required for the RPC call. | |
1244 | */ | |
dbae4c73 | 1245 | static int nfs_commit_rpcsetup(struct list_head *head, |
788e7a89 TM |
1246 | struct nfs_write_data *data, |
1247 | int how) | |
1da177e4 | 1248 | { |
84115e1c TM |
1249 | struct nfs_page *first = nfs_list_entry(head->next); |
1250 | struct inode *inode = first->wb_context->path.dentry->d_inode; | |
3ff7576d | 1251 | int priority = flush_task_priority(how); |
07737691 | 1252 | struct rpc_task *task; |
bdc7f021 TM |
1253 | struct rpc_message msg = { |
1254 | .rpc_argp = &data->args, | |
1255 | .rpc_resp = &data->res, | |
1256 | .rpc_cred = first->wb_context->cred, | |
1257 | }; | |
84115e1c | 1258 | struct rpc_task_setup task_setup_data = { |
07737691 | 1259 | .task = &data->task, |
84115e1c | 1260 | .rpc_client = NFS_CLIENT(inode), |
bdc7f021 | 1261 | .rpc_message = &msg, |
84115e1c TM |
1262 | .callback_ops = &nfs_commit_ops, |
1263 | .callback_data = data, | |
101070ca | 1264 | .workqueue = nfsiod_workqueue, |
2c61be0a | 1265 | .flags = RPC_TASK_ASYNC, |
3ff7576d | 1266 | .priority = priority, |
84115e1c | 1267 | }; |
1da177e4 LT |
1268 | |
1269 | /* Set up the RPC argument and reply structs | |
1270 | * NB: take care not to mess about with data->commit et al. */ | |
1271 | ||
1272 | list_splice_init(head, &data->pages); | |
1da177e4 | 1273 | |
1da177e4 | 1274 | data->inode = inode; |
bdc7f021 | 1275 | data->cred = msg.rpc_cred; |
1da177e4 LT |
1276 | |
1277 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1278 | /* Note: we always request a commit of the entire inode */ |
1279 | data->args.offset = 0; | |
1280 | data->args.count = 0; | |
383ba719 | 1281 | data->args.context = get_nfs_open_context(first->wb_context); |
3da28eb1 | 1282 | data->res.count = 0; |
1da177e4 LT |
1283 | data->res.fattr = &data->fattr; |
1284 | data->res.verf = &data->verf; | |
0e574af1 | 1285 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1286 | |
1287 | /* Set up the initial task struct. */ | |
bdc7f021 | 1288 | NFS_PROTO(inode)->commit_setup(data, &msg); |
1da177e4 | 1289 | |
a3f565b1 | 1290 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); |
bdc7f021 | 1291 | |
07737691 | 1292 | task = rpc_run_task(&task_setup_data); |
dbae4c73 TM |
1293 | if (IS_ERR(task)) |
1294 | return PTR_ERR(task); | |
d2224e7a JL |
1295 | if (how & FLUSH_SYNC) |
1296 | rpc_wait_for_completion_task(task); | |
dbae4c73 TM |
1297 | rpc_put_task(task); |
1298 | return 0; | |
1da177e4 LT |
1299 | } |
1300 | ||
1301 | /* | |
1302 | * Commit dirty pages | |
1303 | */ | |
1304 | static int | |
40859d7e | 1305 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1306 | { |
1307 | struct nfs_write_data *data; | |
1308 | struct nfs_page *req; | |
1309 | ||
c9d8f89d | 1310 | data = nfs_commitdata_alloc(); |
1da177e4 LT |
1311 | |
1312 | if (!data) | |
1313 | goto out_bad; | |
1314 | ||
1315 | /* Set up the argument struct */ | |
dbae4c73 | 1316 | return nfs_commit_rpcsetup(head, data, how); |
1da177e4 LT |
1317 | out_bad: |
1318 | while (!list_empty(head)) { | |
1319 | req = nfs_list_entry(head->next); | |
1320 | nfs_list_remove_request(req); | |
1321 | nfs_mark_request_commit(req); | |
83715ad5 | 1322 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 PZ |
1323 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
1324 | BDI_RECLAIMABLE); | |
9fd367f0 | 1325 | nfs_clear_page_tag_locked(req); |
1da177e4 | 1326 | } |
71d0a611 | 1327 | nfs_commit_clear_lock(NFS_I(inode)); |
1da177e4 LT |
1328 | return -ENOMEM; |
1329 | } | |
1330 | ||
1331 | /* | |
1332 | * COMMIT call returned | |
1333 | */ | |
788e7a89 | 1334 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1335 | { |
963d8fe5 | 1336 | struct nfs_write_data *data = calldata; |
1da177e4 | 1337 | |
a3f565b1 | 1338 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
1da177e4 LT |
1339 | task->tk_pid, task->tk_status); |
1340 | ||
788e7a89 TM |
1341 | /* Call the NFS version-specific code */ |
1342 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1343 | return; | |
c9d8f89d TM |
1344 | } |
1345 | ||
1346 | static void nfs_commit_release(void *calldata) | |
1347 | { | |
1348 | struct nfs_write_data *data = calldata; | |
1349 | struct nfs_page *req; | |
1350 | int status = data->task.tk_status; | |
788e7a89 | 1351 | |
1da177e4 LT |
1352 | while (!list_empty(&data->pages)) { |
1353 | req = nfs_list_entry(data->pages.next); | |
1354 | nfs_list_remove_request(req); | |
e468bae9 | 1355 | nfs_clear_request_commit(req); |
1da177e4 | 1356 | |
48186c7d | 1357 | dprintk("NFS: commit (%s/%lld %d@%lld)", |
88be9f99 TM |
1358 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1359 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1360 | req->wb_bytes, |
1361 | (long long)req_offset(req)); | |
c9d8f89d TM |
1362 | if (status < 0) { |
1363 | nfs_context_set_write_error(req->wb_context, status); | |
1da177e4 | 1364 | nfs_inode_remove_request(req); |
c9d8f89d | 1365 | dprintk(", error = %d\n", status); |
1da177e4 LT |
1366 | goto next; |
1367 | } | |
1368 | ||
1369 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1370 | * returned by the server against all stored verfs. */ | |
1371 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1372 | /* We have a match */ | |
1373 | nfs_inode_remove_request(req); | |
1374 | dprintk(" OK\n"); | |
1375 | goto next; | |
1376 | } | |
1377 | /* We have a mismatch. Write the page again */ | |
1378 | dprintk(" mismatch\n"); | |
6d884e8f | 1379 | nfs_mark_request_dirty(req); |
1da177e4 | 1380 | next: |
9fd367f0 | 1381 | nfs_clear_page_tag_locked(req); |
1da177e4 | 1382 | } |
71d0a611 | 1383 | nfs_commit_clear_lock(NFS_I(data->inode)); |
c9d8f89d | 1384 | nfs_commitdata_release(calldata); |
1da177e4 | 1385 | } |
788e7a89 TM |
1386 | |
1387 | static const struct rpc_call_ops nfs_commit_ops = { | |
21d9a851 AA |
1388 | #if defined(CONFIG_NFS_V4_1) |
1389 | .rpc_call_prepare = nfs_write_prepare, | |
1390 | #endif /* CONFIG_NFS_V4_1 */ | |
788e7a89 TM |
1391 | .rpc_call_done = nfs_commit_done, |
1392 | .rpc_release = nfs_commit_release, | |
1393 | }; | |
1da177e4 | 1394 | |
b608b283 | 1395 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 | 1396 | { |
1da177e4 | 1397 | LIST_HEAD(head); |
71d0a611 TM |
1398 | int may_wait = how & FLUSH_SYNC; |
1399 | int res = 0; | |
1da177e4 | 1400 | |
71d0a611 | 1401 | if (!nfs_commit_set_lock(NFS_I(inode), may_wait)) |
c5efa5fc | 1402 | goto out_mark_dirty; |
587142f8 | 1403 | spin_lock(&inode->i_lock); |
3da28eb1 | 1404 | res = nfs_scan_commit(inode, &head, 0, 0); |
587142f8 | 1405 | spin_unlock(&inode->i_lock); |
1da177e4 | 1406 | if (res) { |
7d46a49f | 1407 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1408 | if (error < 0) |
1409 | return error; | |
71d0a611 TM |
1410 | if (may_wait) |
1411 | wait_on_bit(&NFS_I(inode)->flags, NFS_INO_COMMIT, | |
1412 | nfs_wait_bit_killable, | |
1413 | TASK_KILLABLE); | |
c5efa5fc TM |
1414 | else |
1415 | goto out_mark_dirty; | |
71d0a611 TM |
1416 | } else |
1417 | nfs_commit_clear_lock(NFS_I(inode)); | |
c5efa5fc TM |
1418 | return res; |
1419 | /* Note: If we exit without ensuring that the commit is complete, | |
1420 | * we must mark the inode as dirty. Otherwise, future calls to | |
1421 | * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure | |
1422 | * that the data is on the disk. | |
1423 | */ | |
1424 | out_mark_dirty: | |
1425 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); | |
1da177e4 LT |
1426 | return res; |
1427 | } | |
8fc795f7 TM |
1428 | |
1429 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) | |
1430 | { | |
420e3646 TM |
1431 | struct nfs_inode *nfsi = NFS_I(inode); |
1432 | int flags = FLUSH_SYNC; | |
1433 | int ret = 0; | |
8fc795f7 | 1434 | |
a00dd6c0 JL |
1435 | if (wbc->sync_mode == WB_SYNC_NONE) { |
1436 | /* Don't commit yet if this is a non-blocking flush and there | |
1437 | * are a lot of outstanding writes for this mapping. | |
1438 | */ | |
1439 | if (nfsi->ncommit <= (nfsi->npages >> 1)) | |
1440 | goto out_mark_dirty; | |
420e3646 | 1441 | |
a00dd6c0 | 1442 | /* don't wait for the COMMIT response */ |
420e3646 | 1443 | flags = 0; |
a00dd6c0 JL |
1444 | } |
1445 | ||
420e3646 TM |
1446 | ret = nfs_commit_inode(inode, flags); |
1447 | if (ret >= 0) { | |
1448 | if (wbc->sync_mode == WB_SYNC_NONE) { | |
1449 | if (ret < wbc->nr_to_write) | |
1450 | wbc->nr_to_write -= ret; | |
1451 | else | |
1452 | wbc->nr_to_write = 0; | |
1453 | } | |
8fc795f7 | 1454 | return 0; |
420e3646 TM |
1455 | } |
1456 | out_mark_dirty: | |
8fc795f7 TM |
1457 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1458 | return ret; | |
1459 | } | |
c63c7b05 | 1460 | #else |
8fc795f7 TM |
1461 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) |
1462 | { | |
1463 | return 0; | |
1464 | } | |
1da177e4 LT |
1465 | #endif |
1466 | ||
8fc795f7 TM |
1467 | int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1468 | { | |
1469 | return nfs_commit_unstable_pages(inode, wbc); | |
1470 | } | |
1471 | ||
acdc53b2 TM |
1472 | /* |
1473 | * flush the inode to disk. | |
1474 | */ | |
1475 | int nfs_wb_all(struct inode *inode) | |
34901f70 TM |
1476 | { |
1477 | struct writeback_control wbc = { | |
72cb77f4 | 1478 | .sync_mode = WB_SYNC_ALL, |
34901f70 | 1479 | .nr_to_write = LONG_MAX, |
d7fb1207 TM |
1480 | .range_start = 0, |
1481 | .range_end = LLONG_MAX, | |
34901f70 | 1482 | }; |
34901f70 | 1483 | |
acdc53b2 | 1484 | return sync_inode(inode, &wbc); |
1c75950b TM |
1485 | } |
1486 | ||
1b3b4a1a TM |
1487 | int nfs_wb_page_cancel(struct inode *inode, struct page *page) |
1488 | { | |
1489 | struct nfs_page *req; | |
1b3b4a1a TM |
1490 | int ret = 0; |
1491 | ||
1492 | BUG_ON(!PageLocked(page)); | |
1493 | for (;;) { | |
ba8b06e6 | 1494 | wait_on_page_writeback(page); |
1b3b4a1a TM |
1495 | req = nfs_page_find_request(page); |
1496 | if (req == NULL) | |
1b3b4a1a | 1497 | break; |
1b3b4a1a TM |
1498 | if (nfs_lock_request_dontget(req)) { |
1499 | nfs_inode_remove_request(req); | |
1500 | /* | |
1501 | * In case nfs_inode_remove_request has marked the | |
1502 | * page as being dirty | |
1503 | */ | |
1504 | cancel_dirty_page(page, PAGE_CACHE_SIZE); | |
1505 | nfs_unlock_request(req); | |
1506 | break; | |
1507 | } | |
1508 | ret = nfs_wait_on_request(req); | |
c9edda71 | 1509 | nfs_release_request(req); |
1b3b4a1a | 1510 | if (ret < 0) |
c988950e | 1511 | break; |
1b3b4a1a | 1512 | } |
1b3b4a1a TM |
1513 | return ret; |
1514 | } | |
1515 | ||
7f2f12d9 TM |
1516 | /* |
1517 | * Write back all requests on one page - we do this before reading it. | |
1518 | */ | |
1519 | int nfs_wb_page(struct inode *inode, struct page *page) | |
1c75950b TM |
1520 | { |
1521 | loff_t range_start = page_offset(page); | |
1522 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
4d770ccf | 1523 | struct writeback_control wbc = { |
4d770ccf | 1524 | .sync_mode = WB_SYNC_ALL, |
7f2f12d9 | 1525 | .nr_to_write = 0, |
4d770ccf TM |
1526 | .range_start = range_start, |
1527 | .range_end = range_end, | |
1528 | }; | |
1529 | int ret; | |
1c75950b | 1530 | |
0522f6ad | 1531 | for (;;) { |
ba8b06e6 | 1532 | wait_on_page_writeback(page); |
73e3302f TM |
1533 | if (clear_page_dirty_for_io(page)) { |
1534 | ret = nfs_writepage_locked(page, &wbc); | |
1535 | if (ret < 0) | |
1536 | goto out_error; | |
0522f6ad | 1537 | continue; |
7f2f12d9 | 1538 | } |
0522f6ad TM |
1539 | if (!PagePrivate(page)) |
1540 | break; | |
1541 | ret = nfs_commit_inode(inode, FLUSH_SYNC); | |
ba8b06e6 | 1542 | if (ret < 0) |
73e3302f | 1543 | goto out_error; |
7f2f12d9 | 1544 | } |
73e3302f TM |
1545 | return 0; |
1546 | out_error: | |
4d770ccf | 1547 | return ret; |
1c75950b TM |
1548 | } |
1549 | ||
074cc1de TM |
1550 | #ifdef CONFIG_MIGRATION |
1551 | int nfs_migrate_page(struct address_space *mapping, struct page *newpage, | |
1552 | struct page *page) | |
1553 | { | |
1554 | struct nfs_page *req; | |
1555 | int ret; | |
1556 | ||
7549ad5f | 1557 | nfs_fscache_release_page(page, GFP_KERNEL); |
074cc1de | 1558 | |
cfb506e1 | 1559 | req = nfs_find_and_lock_request(page, false); |
074cc1de TM |
1560 | ret = PTR_ERR(req); |
1561 | if (IS_ERR(req)) | |
1562 | goto out; | |
1563 | ||
1564 | ret = migrate_page(mapping, newpage, page); | |
1565 | if (!req) | |
1566 | goto out; | |
1567 | if (ret) | |
1568 | goto out_unlock; | |
1569 | page_cache_get(newpage); | |
190f38e5 | 1570 | spin_lock(&mapping->host->i_lock); |
074cc1de TM |
1571 | req->wb_page = newpage; |
1572 | SetPagePrivate(newpage); | |
190f38e5 | 1573 | set_page_private(newpage, (unsigned long)req); |
074cc1de TM |
1574 | ClearPagePrivate(page); |
1575 | set_page_private(page, 0); | |
190f38e5 | 1576 | spin_unlock(&mapping->host->i_lock); |
074cc1de TM |
1577 | page_cache_release(page); |
1578 | out_unlock: | |
1579 | nfs_clear_page_tag_locked(req); | |
074cc1de TM |
1580 | out: |
1581 | return ret; | |
1582 | } | |
1583 | #endif | |
1584 | ||
f7b422b1 | 1585 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1586 | { |
1587 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1588 | sizeof(struct nfs_write_data), | |
1589 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1590 | NULL); |
1da177e4 LT |
1591 | if (nfs_wdata_cachep == NULL) |
1592 | return -ENOMEM; | |
1593 | ||
93d2341c MD |
1594 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1595 | nfs_wdata_cachep); | |
1da177e4 LT |
1596 | if (nfs_wdata_mempool == NULL) |
1597 | return -ENOMEM; | |
1598 | ||
93d2341c MD |
1599 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1600 | nfs_wdata_cachep); | |
1da177e4 LT |
1601 | if (nfs_commit_mempool == NULL) |
1602 | return -ENOMEM; | |
1603 | ||
89a09141 PZ |
1604 | /* |
1605 | * NFS congestion size, scale with available memory. | |
1606 | * | |
1607 | * 64MB: 8192k | |
1608 | * 128MB: 11585k | |
1609 | * 256MB: 16384k | |
1610 | * 512MB: 23170k | |
1611 | * 1GB: 32768k | |
1612 | * 2GB: 46340k | |
1613 | * 4GB: 65536k | |
1614 | * 8GB: 92681k | |
1615 | * 16GB: 131072k | |
1616 | * | |
1617 | * This allows larger machines to have larger/more transfers. | |
1618 | * Limit the default to 256M | |
1619 | */ | |
1620 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); | |
1621 | if (nfs_congestion_kb > 256*1024) | |
1622 | nfs_congestion_kb = 256*1024; | |
1623 | ||
1da177e4 LT |
1624 | return 0; |
1625 | } | |
1626 | ||
266bee88 | 1627 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1628 | { |
1629 | mempool_destroy(nfs_commit_mempool); | |
1630 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1631 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1632 | } |
1633 |