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); | |
5f7dbd5c | 58 | p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE; |
1da177e4 LT |
59 | } |
60 | return p; | |
61 | } | |
62 | ||
5e4424af | 63 | void nfs_commit_free(struct nfs_write_data *p) |
1da177e4 | 64 | { |
40859d7e CL |
65 | if (p && (p->pagevec != &p->page_array[0])) |
66 | kfree(p->pagevec); | |
1da177e4 LT |
67 | mempool_free(p, nfs_commit_mempool); |
68 | } | |
69 | ||
8d5658c9 | 70 | struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount) |
3feb2d49 | 71 | { |
e6b4f8da | 72 | struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS); |
3feb2d49 TM |
73 | |
74 | if (p) { | |
75 | memset(p, 0, sizeof(*p)); | |
76 | INIT_LIST_HEAD(&p->pages); | |
e9f7bee1 | 77 | p->npages = pagecount; |
5f7dbd5c | 78 | p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE; |
0d0b5cb3 CL |
79 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
80 | p->pagevec = p->page_array; | |
3feb2d49 | 81 | else { |
0d0b5cb3 CL |
82 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
83 | if (!p->pagevec) { | |
3feb2d49 TM |
84 | mempool_free(p, nfs_wdata_mempool); |
85 | p = NULL; | |
86 | } | |
87 | } | |
88 | } | |
89 | return p; | |
90 | } | |
91 | ||
1ae88b2e | 92 | void nfs_writedata_free(struct nfs_write_data *p) |
3feb2d49 TM |
93 | { |
94 | if (p && (p->pagevec != &p->page_array[0])) | |
95 | kfree(p->pagevec); | |
96 | mempool_free(p, nfs_wdata_mempool); | |
97 | } | |
98 | ||
1ae88b2e | 99 | static void nfs_writedata_release(struct nfs_write_data *wdata) |
1da177e4 | 100 | { |
383ba719 | 101 | put_nfs_open_context(wdata->args.context); |
1da177e4 LT |
102 | nfs_writedata_free(wdata); |
103 | } | |
104 | ||
7b159fc1 TM |
105 | static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error) |
106 | { | |
107 | ctx->error = error; | |
108 | smp_wmb(); | |
109 | set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
110 | } | |
111 | ||
277459d2 TM |
112 | static struct nfs_page *nfs_page_find_request_locked(struct page *page) |
113 | { | |
114 | struct nfs_page *req = NULL; | |
115 | ||
116 | if (PagePrivate(page)) { | |
117 | req = (struct nfs_page *)page_private(page); | |
118 | if (req != NULL) | |
c03b4024 | 119 | kref_get(&req->wb_kref); |
277459d2 TM |
120 | } |
121 | return req; | |
122 | } | |
123 | ||
124 | static struct nfs_page *nfs_page_find_request(struct page *page) | |
125 | { | |
587142f8 | 126 | struct inode *inode = page->mapping->host; |
277459d2 | 127 | struct nfs_page *req = NULL; |
277459d2 | 128 | |
587142f8 | 129 | spin_lock(&inode->i_lock); |
277459d2 | 130 | req = nfs_page_find_request_locked(page); |
587142f8 | 131 | spin_unlock(&inode->i_lock); |
277459d2 TM |
132 | return req; |
133 | } | |
134 | ||
1da177e4 LT |
135 | /* Adjust the file length if we're writing beyond the end */ |
136 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) | |
137 | { | |
138 | struct inode *inode = page->mapping->host; | |
a3d01454 TM |
139 | loff_t end, i_size; |
140 | pgoff_t end_index; | |
1da177e4 | 141 | |
a3d01454 TM |
142 | spin_lock(&inode->i_lock); |
143 | i_size = i_size_read(inode); | |
144 | end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; | |
1da177e4 | 145 | if (i_size > 0 && page->index < end_index) |
a3d01454 | 146 | goto out; |
1da177e4 LT |
147 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); |
148 | if (i_size >= end) | |
a3d01454 | 149 | goto out; |
1da177e4 | 150 | i_size_write(inode, end); |
a3d01454 TM |
151 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
152 | out: | |
153 | spin_unlock(&inode->i_lock); | |
1da177e4 LT |
154 | } |
155 | ||
a301b777 TM |
156 | /* A writeback failed: mark the page as bad, and invalidate the page cache */ |
157 | static void nfs_set_pageerror(struct page *page) | |
158 | { | |
159 | SetPageError(page); | |
160 | nfs_zap_mapping(page->mapping->host, page->mapping); | |
161 | } | |
162 | ||
1da177e4 LT |
163 | /* We can set the PG_uptodate flag if we see that a write request |
164 | * covers the full page. | |
165 | */ | |
166 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) | |
167 | { | |
1da177e4 LT |
168 | if (PageUptodate(page)) |
169 | return; | |
170 | if (base != 0) | |
171 | return; | |
49a70f27 | 172 | if (count != nfs_page_length(page)) |
1da177e4 | 173 | return; |
49a70f27 | 174 | SetPageUptodate(page); |
1da177e4 LT |
175 | } |
176 | ||
1da177e4 LT |
177 | static int wb_priority(struct writeback_control *wbc) |
178 | { | |
179 | if (wbc->for_reclaim) | |
c63c7b05 | 180 | return FLUSH_HIGHPRI | FLUSH_STABLE; |
b17621fe | 181 | if (wbc->for_kupdate || wbc->for_background) |
1da177e4 LT |
182 | return FLUSH_LOWPRI; |
183 | return 0; | |
184 | } | |
185 | ||
89a09141 PZ |
186 | /* |
187 | * NFS congestion control | |
188 | */ | |
189 | ||
190 | int nfs_congestion_kb; | |
191 | ||
192 | #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) | |
193 | #define NFS_CONGESTION_OFF_THRESH \ | |
194 | (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) | |
195 | ||
5a6d41b3 | 196 | static int nfs_set_page_writeback(struct page *page) |
89a09141 | 197 | { |
5a6d41b3 TM |
198 | int ret = test_set_page_writeback(page); |
199 | ||
200 | if (!ret) { | |
89a09141 PZ |
201 | struct inode *inode = page->mapping->host; |
202 | struct nfs_server *nfss = NFS_SERVER(inode); | |
203 | ||
a6305ddb | 204 | page_cache_get(page); |
277866a0 | 205 | if (atomic_long_inc_return(&nfss->writeback) > |
8aa7e847 JA |
206 | NFS_CONGESTION_ON_THRESH) { |
207 | set_bdi_congested(&nfss->backing_dev_info, | |
208 | BLK_RW_ASYNC); | |
209 | } | |
89a09141 | 210 | } |
5a6d41b3 | 211 | return ret; |
89a09141 PZ |
212 | } |
213 | ||
214 | static void nfs_end_page_writeback(struct page *page) | |
215 | { | |
216 | struct inode *inode = page->mapping->host; | |
217 | struct nfs_server *nfss = NFS_SERVER(inode); | |
218 | ||
219 | end_page_writeback(page); | |
a6305ddb | 220 | page_cache_release(page); |
c4dc4bee | 221 | if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) |
8aa7e847 | 222 | clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC); |
89a09141 PZ |
223 | } |
224 | ||
cfb506e1 | 225 | static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock) |
e261f51f | 226 | { |
587142f8 | 227 | struct inode *inode = page->mapping->host; |
e261f51f | 228 | struct nfs_page *req; |
e261f51f TM |
229 | int ret; |
230 | ||
587142f8 | 231 | spin_lock(&inode->i_lock); |
074cc1de | 232 | for (;;) { |
e261f51f | 233 | req = nfs_page_find_request_locked(page); |
074cc1de TM |
234 | if (req == NULL) |
235 | break; | |
acee478a | 236 | if (nfs_set_page_tag_locked(req)) |
e261f51f TM |
237 | break; |
238 | /* Note: If we hold the page lock, as is the case in nfs_writepage, | |
acee478a | 239 | * then the call to nfs_set_page_tag_locked() will always |
e261f51f TM |
240 | * succeed provided that someone hasn't already marked the |
241 | * request as dirty (in which case we don't care). | |
242 | */ | |
587142f8 | 243 | spin_unlock(&inode->i_lock); |
cfb506e1 TM |
244 | if (!nonblock) |
245 | ret = nfs_wait_on_request(req); | |
246 | else | |
247 | ret = -EAGAIN; | |
e261f51f TM |
248 | nfs_release_request(req); |
249 | if (ret != 0) | |
074cc1de | 250 | return ERR_PTR(ret); |
587142f8 | 251 | spin_lock(&inode->i_lock); |
e261f51f | 252 | } |
587142f8 | 253 | spin_unlock(&inode->i_lock); |
074cc1de TM |
254 | return req; |
255 | } | |
256 | ||
257 | /* | |
258 | * Find an associated nfs write request, and prepare to flush it out | |
259 | * May return an error if the user signalled nfs_wait_on_request(). | |
260 | */ | |
261 | static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, | |
cfb506e1 | 262 | struct page *page, bool nonblock) |
074cc1de TM |
263 | { |
264 | struct nfs_page *req; | |
265 | int ret = 0; | |
266 | ||
cfb506e1 | 267 | req = nfs_find_and_lock_request(page, nonblock); |
074cc1de TM |
268 | if (!req) |
269 | goto out; | |
270 | ret = PTR_ERR(req); | |
271 | if (IS_ERR(req)) | |
272 | goto out; | |
273 | ||
274 | ret = nfs_set_page_writeback(page); | |
275 | BUG_ON(ret != 0); | |
276 | BUG_ON(test_bit(PG_CLEAN, &req->wb_flags)); | |
277 | ||
f8512ad0 FI |
278 | if (!nfs_pageio_add_request(pgio, req)) { |
279 | nfs_redirty_request(req); | |
074cc1de | 280 | ret = pgio->pg_error; |
f8512ad0 | 281 | } |
074cc1de TM |
282 | out: |
283 | return ret; | |
e261f51f TM |
284 | } |
285 | ||
f758c885 | 286 | static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) |
1da177e4 | 287 | { |
1da177e4 | 288 | struct inode *inode = page->mapping->host; |
cfb506e1 | 289 | int ret; |
1da177e4 | 290 | |
91d5b470 CL |
291 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
292 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
293 | ||
7fe7f848 | 294 | nfs_pageio_cond_complete(pgio, page->index); |
cfb506e1 TM |
295 | ret = nfs_page_async_flush(pgio, page, |
296 | wbc->sync_mode == WB_SYNC_NONE || | |
297 | wbc->nonblocking != 0); | |
298 | if (ret == -EAGAIN) { | |
299 | redirty_page_for_writepage(wbc, page); | |
300 | ret = 0; | |
301 | } | |
302 | return ret; | |
f758c885 | 303 | } |
7fe7f848 | 304 | |
f758c885 TM |
305 | /* |
306 | * Write an mmapped page to the server. | |
307 | */ | |
308 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
309 | { | |
310 | struct nfs_pageio_descriptor pgio; | |
311 | int err; | |
49a70f27 | 312 | |
f758c885 TM |
313 | nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc)); |
314 | err = nfs_do_writepage(page, wbc, &pgio); | |
315 | nfs_pageio_complete(&pgio); | |
316 | if (err < 0) | |
317 | return err; | |
318 | if (pgio.pg_error < 0) | |
319 | return pgio.pg_error; | |
320 | return 0; | |
4d770ccf TM |
321 | } |
322 | ||
323 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
324 | { | |
f758c885 | 325 | int ret; |
4d770ccf | 326 | |
f758c885 | 327 | ret = nfs_writepage_locked(page, wbc); |
1da177e4 | 328 | unlock_page(page); |
f758c885 TM |
329 | return ret; |
330 | } | |
331 | ||
332 | static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) | |
333 | { | |
334 | int ret; | |
335 | ||
336 | ret = nfs_do_writepage(page, wbc, data); | |
337 | unlock_page(page); | |
338 | return ret; | |
1da177e4 LT |
339 | } |
340 | ||
1da177e4 LT |
341 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) |
342 | { | |
1da177e4 | 343 | struct inode *inode = mapping->host; |
72cb77f4 | 344 | unsigned long *bitlock = &NFS_I(inode)->flags; |
c63c7b05 | 345 | struct nfs_pageio_descriptor pgio; |
1da177e4 LT |
346 | int err; |
347 | ||
72cb77f4 TM |
348 | /* Stop dirtying of new pages while we sync */ |
349 | err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING, | |
350 | nfs_wait_bit_killable, TASK_KILLABLE); | |
351 | if (err) | |
352 | goto out_err; | |
353 | ||
91d5b470 CL |
354 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
355 | ||
c63c7b05 | 356 | nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); |
f758c885 | 357 | err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); |
c63c7b05 | 358 | nfs_pageio_complete(&pgio); |
72cb77f4 TM |
359 | |
360 | clear_bit_unlock(NFS_INO_FLUSHING, bitlock); | |
361 | smp_mb__after_clear_bit(); | |
362 | wake_up_bit(bitlock, NFS_INO_FLUSHING); | |
363 | ||
f758c885 | 364 | if (err < 0) |
72cb77f4 TM |
365 | goto out_err; |
366 | err = pgio.pg_error; | |
367 | if (err < 0) | |
368 | goto out_err; | |
c63c7b05 | 369 | return 0; |
72cb77f4 TM |
370 | out_err: |
371 | return err; | |
1da177e4 LT |
372 | } |
373 | ||
374 | /* | |
375 | * Insert a write request into an inode | |
376 | */ | |
e7d39069 | 377 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) |
1da177e4 LT |
378 | { |
379 | struct nfs_inode *nfsi = NFS_I(inode); | |
380 | int error; | |
381 | ||
e7d39069 TM |
382 | error = radix_tree_preload(GFP_NOFS); |
383 | if (error != 0) | |
384 | goto out; | |
385 | ||
386 | /* Lock the request! */ | |
387 | nfs_lock_request_dontget(req); | |
388 | ||
389 | spin_lock(&inode->i_lock); | |
1da177e4 | 390 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); |
27852596 | 391 | BUG_ON(error); |
1da177e4 LT |
392 | if (!nfsi->npages) { |
393 | igrab(inode); | |
1da177e4 LT |
394 | if (nfs_have_delegation(inode, FMODE_WRITE)) |
395 | nfsi->change_attr++; | |
396 | } | |
deb7d638 | 397 | SetPagePrivate(req->wb_page); |
277459d2 | 398 | set_page_private(req->wb_page, (unsigned long)req); |
1da177e4 | 399 | nfsi->npages++; |
c03b4024 | 400 | kref_get(&req->wb_kref); |
27852596 NP |
401 | radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, |
402 | NFS_PAGE_TAG_LOCKED); | |
e7d39069 TM |
403 | spin_unlock(&inode->i_lock); |
404 | radix_tree_preload_end(); | |
405 | out: | |
406 | return error; | |
1da177e4 LT |
407 | } |
408 | ||
409 | /* | |
89a09141 | 410 | * Remove a write request from an inode |
1da177e4 LT |
411 | */ |
412 | static void nfs_inode_remove_request(struct nfs_page *req) | |
413 | { | |
88be9f99 | 414 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
415 | struct nfs_inode *nfsi = NFS_I(inode); |
416 | ||
417 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
418 | ||
587142f8 | 419 | spin_lock(&inode->i_lock); |
277459d2 | 420 | set_page_private(req->wb_page, 0); |
deb7d638 | 421 | ClearPagePrivate(req->wb_page); |
1da177e4 LT |
422 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
423 | nfsi->npages--; | |
424 | if (!nfsi->npages) { | |
587142f8 | 425 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
426 | iput(inode); |
427 | } else | |
587142f8 | 428 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
429 | nfs_clear_request(req); |
430 | nfs_release_request(req); | |
431 | } | |
432 | ||
61822ab5 | 433 | static void |
6d884e8f | 434 | nfs_mark_request_dirty(struct nfs_page *req) |
61822ab5 | 435 | { |
61822ab5 | 436 | __set_page_dirty_nobuffers(req->wb_page); |
b80c3cb6 | 437 | __mark_inode_dirty(req->wb_page->mapping->host, I_DIRTY_DATASYNC); |
61822ab5 TM |
438 | } |
439 | ||
1da177e4 LT |
440 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
441 | /* | |
442 | * Add a request to the inode's commit list. | |
443 | */ | |
444 | static void | |
445 | nfs_mark_request_commit(struct nfs_page *req) | |
446 | { | |
88be9f99 | 447 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
448 | struct nfs_inode *nfsi = NFS_I(inode); |
449 | ||
587142f8 | 450 | spin_lock(&inode->i_lock); |
e468bae9 | 451 | set_bit(PG_CLEAN, &(req)->wb_flags); |
5c369683 TM |
452 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
453 | req->wb_index, | |
454 | NFS_PAGE_TAG_COMMIT); | |
ff778d02 | 455 | nfsi->ncommit++; |
587142f8 | 456 | spin_unlock(&inode->i_lock); |
fd39fc85 | 457 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 | 458 | inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE); |
a1803044 | 459 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1da177e4 | 460 | } |
8e821cad | 461 | |
e468bae9 TM |
462 | static int |
463 | nfs_clear_request_commit(struct nfs_page *req) | |
464 | { | |
465 | struct page *page = req->wb_page; | |
466 | ||
467 | if (test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) { | |
468 | dec_zone_page_state(page, NR_UNSTABLE_NFS); | |
469 | dec_bdi_stat(page->mapping->backing_dev_info, BDI_RECLAIMABLE); | |
470 | return 1; | |
471 | } | |
472 | return 0; | |
473 | } | |
474 | ||
8e821cad TM |
475 | static inline |
476 | int nfs_write_need_commit(struct nfs_write_data *data) | |
477 | { | |
478 | return data->verf.committed != NFS_FILE_SYNC; | |
479 | } | |
480 | ||
481 | static inline | |
482 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
483 | { | |
e468bae9 | 484 | if (test_and_clear_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
8e821cad TM |
485 | nfs_mark_request_commit(req); |
486 | return 1; | |
487 | } | |
488 | if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { | |
6d884e8f | 489 | nfs_mark_request_dirty(req); |
8e821cad TM |
490 | return 1; |
491 | } | |
492 | return 0; | |
493 | } | |
494 | #else | |
495 | static inline void | |
496 | nfs_mark_request_commit(struct nfs_page *req) | |
497 | { | |
498 | } | |
499 | ||
e468bae9 TM |
500 | static inline int |
501 | nfs_clear_request_commit(struct nfs_page *req) | |
502 | { | |
503 | return 0; | |
504 | } | |
505 | ||
8e821cad TM |
506 | static inline |
507 | int nfs_write_need_commit(struct nfs_write_data *data) | |
508 | { | |
509 | return 0; | |
510 | } | |
511 | ||
512 | static inline | |
513 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
514 | { | |
515 | return 0; | |
516 | } | |
1da177e4 LT |
517 | #endif |
518 | ||
47c62564 | 519 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
fb8a1f11 TM |
520 | static int |
521 | nfs_need_commit(struct nfs_inode *nfsi) | |
522 | { | |
523 | return radix_tree_tagged(&nfsi->nfs_page_tree, NFS_PAGE_TAG_COMMIT); | |
524 | } | |
525 | ||
1da177e4 LT |
526 | /* |
527 | * nfs_scan_commit - Scan an inode for commit requests | |
528 | * @inode: NFS inode to scan | |
529 | * @dst: destination list | |
530 | * @idx_start: lower bound of page->index to scan. | |
531 | * @npages: idx_start + npages sets the upper bound to scan. | |
532 | * | |
533 | * Moves requests from the inode's 'commit' request list. | |
534 | * The requests are *not* checked to ensure that they form a contiguous set. | |
535 | */ | |
536 | static int | |
ca52fec1 | 537 | nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
538 | { |
539 | struct nfs_inode *nfsi = NFS_I(inode); | |
ff778d02 | 540 | int ret; |
3da28eb1 | 541 | |
fb8a1f11 TM |
542 | if (!nfs_need_commit(nfsi)) |
543 | return 0; | |
544 | ||
ff778d02 TM |
545 | ret = nfs_scan_list(nfsi, dst, idx_start, npages, NFS_PAGE_TAG_COMMIT); |
546 | if (ret > 0) | |
547 | nfsi->ncommit -= ret; | |
2928db1f TM |
548 | if (nfs_need_commit(NFS_I(inode))) |
549 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); | |
ff778d02 | 550 | return ret; |
1da177e4 | 551 | } |
c42de9dd | 552 | #else |
fb8a1f11 TM |
553 | static inline int nfs_need_commit(struct nfs_inode *nfsi) |
554 | { | |
555 | return 0; | |
556 | } | |
557 | ||
ca52fec1 | 558 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
c42de9dd TM |
559 | { |
560 | return 0; | |
561 | } | |
1da177e4 LT |
562 | #endif |
563 | ||
1da177e4 | 564 | /* |
e7d39069 TM |
565 | * Search for an existing write request, and attempt to update |
566 | * it to reflect a new dirty region on a given page. | |
1da177e4 | 567 | * |
e7d39069 TM |
568 | * If the attempt fails, then the existing request is flushed out |
569 | * to disk. | |
1da177e4 | 570 | */ |
e7d39069 TM |
571 | static struct nfs_page *nfs_try_to_update_request(struct inode *inode, |
572 | struct page *page, | |
573 | unsigned int offset, | |
574 | unsigned int bytes) | |
1da177e4 | 575 | { |
e7d39069 TM |
576 | struct nfs_page *req; |
577 | unsigned int rqend; | |
578 | unsigned int end; | |
579 | int error; | |
580 | ||
581 | if (!PagePrivate(page)) | |
582 | return NULL; | |
1da177e4 LT |
583 | |
584 | end = offset + bytes; | |
e7d39069 | 585 | spin_lock(&inode->i_lock); |
1da177e4 | 586 | |
1da177e4 | 587 | for (;;) { |
277459d2 | 588 | req = nfs_page_find_request_locked(page); |
e7d39069 TM |
589 | if (req == NULL) |
590 | goto out_unlock; | |
591 | ||
592 | rqend = req->wb_offset + req->wb_bytes; | |
593 | /* | |
594 | * Tell the caller to flush out the request if | |
595 | * the offsets are non-contiguous. | |
596 | * Note: nfs_flush_incompatible() will already | |
597 | * have flushed out requests having wrong owners. | |
598 | */ | |
e468bae9 | 599 | if (offset > rqend |
e7d39069 TM |
600 | || end < req->wb_offset) |
601 | goto out_flushme; | |
602 | ||
603 | if (nfs_set_page_tag_locked(req)) | |
1da177e4 | 604 | break; |
1da177e4 | 605 | |
e7d39069 | 606 | /* The request is locked, so wait and then retry */ |
587142f8 | 607 | spin_unlock(&inode->i_lock); |
e7d39069 TM |
608 | error = nfs_wait_on_request(req); |
609 | nfs_release_request(req); | |
610 | if (error != 0) | |
611 | goto out_err; | |
612 | spin_lock(&inode->i_lock); | |
1da177e4 LT |
613 | } |
614 | ||
ff778d02 TM |
615 | if (nfs_clear_request_commit(req) && |
616 | radix_tree_tag_clear(&NFS_I(inode)->nfs_page_tree, | |
617 | req->wb_index, NFS_PAGE_TAG_COMMIT) != NULL) | |
618 | NFS_I(inode)->ncommit--; | |
e468bae9 | 619 | |
1da177e4 LT |
620 | /* Okay, the request matches. Update the region */ |
621 | if (offset < req->wb_offset) { | |
622 | req->wb_offset = offset; | |
623 | req->wb_pgbase = offset; | |
1da177e4 | 624 | } |
1da177e4 LT |
625 | if (end > rqend) |
626 | req->wb_bytes = end - req->wb_offset; | |
e7d39069 TM |
627 | else |
628 | req->wb_bytes = rqend - req->wb_offset; | |
629 | out_unlock: | |
630 | spin_unlock(&inode->i_lock); | |
631 | return req; | |
632 | out_flushme: | |
633 | spin_unlock(&inode->i_lock); | |
634 | nfs_release_request(req); | |
635 | error = nfs_wb_page(inode, page); | |
636 | out_err: | |
637 | return ERR_PTR(error); | |
638 | } | |
639 | ||
640 | /* | |
641 | * Try to update an existing write request, or create one if there is none. | |
642 | * | |
643 | * Note: Should always be called with the Page Lock held to prevent races | |
644 | * if we have to add a new request. Also assumes that the caller has | |
645 | * already called nfs_flush_incompatible() if necessary. | |
646 | */ | |
647 | static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx, | |
648 | struct page *page, unsigned int offset, unsigned int bytes) | |
649 | { | |
650 | struct inode *inode = page->mapping->host; | |
651 | struct nfs_page *req; | |
652 | int error; | |
1da177e4 | 653 | |
e7d39069 TM |
654 | req = nfs_try_to_update_request(inode, page, offset, bytes); |
655 | if (req != NULL) | |
656 | goto out; | |
657 | req = nfs_create_request(ctx, inode, page, offset, bytes); | |
658 | if (IS_ERR(req)) | |
659 | goto out; | |
660 | error = nfs_inode_add_request(inode, req); | |
661 | if (error != 0) { | |
662 | nfs_release_request(req); | |
663 | req = ERR_PTR(error); | |
664 | } | |
efc91ed0 | 665 | out: |
61e930a9 | 666 | return req; |
1da177e4 LT |
667 | } |
668 | ||
e7d39069 TM |
669 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
670 | unsigned int offset, unsigned int count) | |
671 | { | |
672 | struct nfs_page *req; | |
673 | ||
674 | req = nfs_setup_write_request(ctx, page, offset, count); | |
675 | if (IS_ERR(req)) | |
676 | return PTR_ERR(req); | |
b80c3cb6 | 677 | nfs_mark_request_dirty(req); |
e7d39069 TM |
678 | /* Update file length */ |
679 | nfs_grow_file(page, offset, count); | |
680 | nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); | |
a6305ddb | 681 | nfs_mark_request_dirty(req); |
e7d39069 TM |
682 | nfs_clear_page_tag_locked(req); |
683 | return 0; | |
684 | } | |
685 | ||
1da177e4 LT |
686 | int nfs_flush_incompatible(struct file *file, struct page *page) |
687 | { | |
cd3758e3 | 688 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 689 | struct nfs_page *req; |
1a54533e | 690 | int do_flush, status; |
1da177e4 LT |
691 | /* |
692 | * Look for a request corresponding to this page. If there | |
693 | * is one, and it belongs to another file, we flush it out | |
694 | * before we try to copy anything into the page. Do this | |
695 | * due to the lack of an ACCESS-type call in NFSv2. | |
696 | * Also do the same if we find a request from an existing | |
697 | * dropped page. | |
698 | */ | |
1a54533e TM |
699 | do { |
700 | req = nfs_page_find_request(page); | |
701 | if (req == NULL) | |
702 | return 0; | |
f11ac8db TM |
703 | do_flush = req->wb_page != page || req->wb_context != ctx || |
704 | req->wb_lock_context->lockowner != current->files || | |
705 | req->wb_lock_context->pid != current->tgid; | |
1da177e4 | 706 | nfs_release_request(req); |
1a54533e TM |
707 | if (!do_flush) |
708 | return 0; | |
709 | status = nfs_wb_page(page->mapping->host, page); | |
710 | } while (status == 0); | |
711 | return status; | |
1da177e4 LT |
712 | } |
713 | ||
5d47a356 TM |
714 | /* |
715 | * If the page cache is marked as unsafe or invalid, then we can't rely on | |
716 | * the PageUptodate() flag. In this case, we will need to turn off | |
717 | * write optimisations that depend on the page contents being correct. | |
718 | */ | |
719 | static int nfs_write_pageuptodate(struct page *page, struct inode *inode) | |
720 | { | |
721 | return PageUptodate(page) && | |
722 | !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA)); | |
723 | } | |
724 | ||
1da177e4 LT |
725 | /* |
726 | * Update and possibly write a cached page of an NFS file. | |
727 | * | |
728 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
729 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
730 | */ | |
731 | int nfs_updatepage(struct file *file, struct page *page, | |
732 | unsigned int offset, unsigned int count) | |
733 | { | |
cd3758e3 | 734 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 735 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
736 | int status = 0; |
737 | ||
91d5b470 CL |
738 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
739 | ||
48186c7d | 740 | dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n", |
01cce933 JJS |
741 | file->f_path.dentry->d_parent->d_name.name, |
742 | file->f_path.dentry->d_name.name, count, | |
48186c7d | 743 | (long long)(page_offset(page) + offset)); |
1da177e4 | 744 | |
1da177e4 | 745 | /* If we're not using byte range locks, and we know the page |
5d47a356 TM |
746 | * is up to date, it may be more efficient to extend the write |
747 | * to cover the entire page in order to avoid fragmentation | |
748 | * inefficiencies. | |
1da177e4 | 749 | */ |
5d47a356 TM |
750 | if (nfs_write_pageuptodate(page, inode) && |
751 | inode->i_flock == NULL && | |
6b2f3d1f | 752 | !(file->f_flags & O_DSYNC)) { |
49a70f27 | 753 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 754 | offset = 0; |
1da177e4 LT |
755 | } |
756 | ||
e21195a7 | 757 | status = nfs_writepage_setup(ctx, page, offset, count); |
03fa9e84 TM |
758 | if (status < 0) |
759 | nfs_set_pageerror(page); | |
1da177e4 | 760 | |
48186c7d | 761 | dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n", |
1da177e4 | 762 | status, (long long)i_size_read(inode)); |
1da177e4 LT |
763 | return status; |
764 | } | |
765 | ||
766 | static void nfs_writepage_release(struct nfs_page *req) | |
767 | { | |
a6305ddb | 768 | struct page *page = req->wb_page; |
1da177e4 | 769 | |
a6305ddb | 770 | if (PageError(req->wb_page) || !nfs_reschedule_unstable_write(req)) |
8e821cad | 771 | nfs_inode_remove_request(req); |
9fd367f0 | 772 | nfs_clear_page_tag_locked(req); |
a6305ddb | 773 | nfs_end_page_writeback(page); |
1da177e4 LT |
774 | } |
775 | ||
3ff7576d | 776 | static int flush_task_priority(int how) |
1da177e4 LT |
777 | { |
778 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
779 | case FLUSH_HIGHPRI: | |
780 | return RPC_PRIORITY_HIGH; | |
781 | case FLUSH_LOWPRI: | |
782 | return RPC_PRIORITY_LOW; | |
783 | } | |
784 | return RPC_PRIORITY_NORMAL; | |
785 | } | |
786 | ||
787 | /* | |
788 | * Set up the argument/result storage required for the RPC call. | |
789 | */ | |
dbae4c73 | 790 | static int nfs_write_rpcsetup(struct nfs_page *req, |
1da177e4 | 791 | struct nfs_write_data *data, |
788e7a89 | 792 | const struct rpc_call_ops *call_ops, |
1da177e4 LT |
793 | unsigned int count, unsigned int offset, |
794 | int how) | |
795 | { | |
84115e1c | 796 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
3ff7576d | 797 | int priority = flush_task_priority(how); |
07737691 | 798 | struct rpc_task *task; |
bdc7f021 TM |
799 | struct rpc_message msg = { |
800 | .rpc_argp = &data->args, | |
801 | .rpc_resp = &data->res, | |
802 | .rpc_cred = req->wb_context->cred, | |
803 | }; | |
84115e1c TM |
804 | struct rpc_task_setup task_setup_data = { |
805 | .rpc_client = NFS_CLIENT(inode), | |
07737691 | 806 | .task = &data->task, |
bdc7f021 | 807 | .rpc_message = &msg, |
84115e1c TM |
808 | .callback_ops = call_ops, |
809 | .callback_data = data, | |
101070ca | 810 | .workqueue = nfsiod_workqueue, |
2c61be0a | 811 | .flags = RPC_TASK_ASYNC, |
3ff7576d | 812 | .priority = priority, |
84115e1c | 813 | }; |
2c61be0a | 814 | int ret = 0; |
1da177e4 LT |
815 | |
816 | /* Set up the RPC argument and reply structs | |
817 | * NB: take care not to mess about with data->commit et al. */ | |
818 | ||
819 | data->req = req; | |
88be9f99 | 820 | data->inode = inode = req->wb_context->path.dentry->d_inode; |
bdc7f021 | 821 | data->cred = msg.rpc_cred; |
1da177e4 LT |
822 | |
823 | data->args.fh = NFS_FH(inode); | |
824 | data->args.offset = req_offset(req) + offset; | |
825 | data->args.pgbase = req->wb_pgbase + offset; | |
826 | data->args.pages = data->pagevec; | |
827 | data->args.count = count; | |
383ba719 | 828 | data->args.context = get_nfs_open_context(req->wb_context); |
f11ac8db | 829 | data->args.lock_context = req->wb_lock_context; |
bdc7f021 TM |
830 | data->args.stable = NFS_UNSTABLE; |
831 | if (how & FLUSH_STABLE) { | |
832 | data->args.stable = NFS_DATA_SYNC; | |
fb8a1f11 | 833 | if (!nfs_need_commit(NFS_I(inode))) |
bdc7f021 TM |
834 | data->args.stable = NFS_FILE_SYNC; |
835 | } | |
1da177e4 LT |
836 | |
837 | data->res.fattr = &data->fattr; | |
838 | data->res.count = count; | |
839 | data->res.verf = &data->verf; | |
0e574af1 | 840 | nfs_fattr_init(&data->fattr); |
1da177e4 | 841 | |
788e7a89 | 842 | /* Set up the initial task struct. */ |
bdc7f021 | 843 | NFS_PROTO(inode)->write_setup(data, &msg); |
1da177e4 | 844 | |
a3f565b1 | 845 | dprintk("NFS: %5u initiated write call " |
48186c7d | 846 | "(req %s/%lld, %u bytes @ offset %llu)\n", |
0bbacc40 | 847 | data->task.tk_pid, |
1da177e4 LT |
848 | inode->i_sb->s_id, |
849 | (long long)NFS_FILEID(inode), | |
850 | count, | |
851 | (unsigned long long)data->args.offset); | |
1da177e4 | 852 | |
07737691 | 853 | task = rpc_run_task(&task_setup_data); |
2c61be0a TM |
854 | if (IS_ERR(task)) { |
855 | ret = PTR_ERR(task); | |
856 | goto out; | |
857 | } | |
858 | if (how & FLUSH_SYNC) { | |
859 | ret = rpc_wait_for_completion_task(task); | |
860 | if (ret == 0) | |
861 | ret = task->tk_status; | |
862 | } | |
dbae4c73 | 863 | rpc_put_task(task); |
2c61be0a TM |
864 | out: |
865 | return ret; | |
1da177e4 LT |
866 | } |
867 | ||
6d884e8f F |
868 | /* If a nfs_flush_* function fails, it should remove reqs from @head and |
869 | * call this on each, which will prepare them to be retried on next | |
870 | * writeback using standard nfs. | |
871 | */ | |
872 | static void nfs_redirty_request(struct nfs_page *req) | |
873 | { | |
a6305ddb TM |
874 | struct page *page = req->wb_page; |
875 | ||
6d884e8f | 876 | nfs_mark_request_dirty(req); |
6d884e8f | 877 | nfs_clear_page_tag_locked(req); |
a6305ddb | 878 | nfs_end_page_writeback(page); |
6d884e8f F |
879 | } |
880 | ||
1da177e4 LT |
881 | /* |
882 | * Generate multiple small requests to write out a single | |
883 | * contiguous dirty area on one page. | |
884 | */ | |
8d5658c9 | 885 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
886 | { |
887 | struct nfs_page *req = nfs_list_entry(head->next); | |
888 | struct page *page = req->wb_page; | |
889 | struct nfs_write_data *data; | |
e9f7bee1 TM |
890 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
891 | unsigned int offset; | |
1da177e4 | 892 | int requests = 0; |
dbae4c73 | 893 | int ret = 0; |
1da177e4 LT |
894 | LIST_HEAD(list); |
895 | ||
896 | nfs_list_remove_request(req); | |
897 | ||
bcb71bba | 898 | nbytes = count; |
e9f7bee1 TM |
899 | do { |
900 | size_t len = min(nbytes, wsize); | |
901 | ||
8d5658c9 | 902 | data = nfs_writedata_alloc(1); |
1da177e4 LT |
903 | if (!data) |
904 | goto out_bad; | |
905 | list_add(&data->pages, &list); | |
906 | requests++; | |
e9f7bee1 TM |
907 | nbytes -= len; |
908 | } while (nbytes != 0); | |
1da177e4 LT |
909 | atomic_set(&req->wb_complete, requests); |
910 | ||
911 | ClearPageError(page); | |
1da177e4 | 912 | offset = 0; |
bcb71bba | 913 | nbytes = count; |
1da177e4 | 914 | do { |
dbae4c73 TM |
915 | int ret2; |
916 | ||
1da177e4 LT |
917 | data = list_entry(list.next, struct nfs_write_data, pages); |
918 | list_del_init(&data->pages); | |
919 | ||
920 | data->pagevec[0] = page; | |
1da177e4 | 921 | |
bcb71bba TM |
922 | if (nbytes < wsize) |
923 | wsize = nbytes; | |
dbae4c73 | 924 | ret2 = nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
bcb71bba | 925 | wsize, offset, how); |
dbae4c73 TM |
926 | if (ret == 0) |
927 | ret = ret2; | |
bcb71bba TM |
928 | offset += wsize; |
929 | nbytes -= wsize; | |
1da177e4 LT |
930 | } while (nbytes != 0); |
931 | ||
dbae4c73 | 932 | return ret; |
1da177e4 LT |
933 | |
934 | out_bad: | |
935 | while (!list_empty(&list)) { | |
936 | data = list_entry(list.next, struct nfs_write_data, pages); | |
937 | list_del(&data->pages); | |
8aca67f0 | 938 | nfs_writedata_release(data); |
1da177e4 | 939 | } |
61822ab5 | 940 | nfs_redirty_request(req); |
1da177e4 LT |
941 | return -ENOMEM; |
942 | } | |
943 | ||
944 | /* | |
945 | * Create an RPC task for the given write request and kick it. | |
946 | * The page must have been locked by the caller. | |
947 | * | |
948 | * It may happen that the page we're passed is not marked dirty. | |
949 | * This is the case if nfs_updatepage detects a conflicting request | |
950 | * that has been written but not committed. | |
951 | */ | |
8d5658c9 | 952 | static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
953 | { |
954 | struct nfs_page *req; | |
955 | struct page **pages; | |
956 | struct nfs_write_data *data; | |
1da177e4 | 957 | |
8d5658c9 | 958 | data = nfs_writedata_alloc(npages); |
1da177e4 LT |
959 | if (!data) |
960 | goto out_bad; | |
961 | ||
962 | pages = data->pagevec; | |
1da177e4 LT |
963 | while (!list_empty(head)) { |
964 | req = nfs_list_entry(head->next); | |
965 | nfs_list_remove_request(req); | |
966 | nfs_list_add_request(req, &data->pages); | |
967 | ClearPageError(req->wb_page); | |
1da177e4 | 968 | *pages++ = req->wb_page; |
1da177e4 LT |
969 | } |
970 | req = nfs_list_entry(data->pages.next); | |
971 | ||
1da177e4 | 972 | /* Set up the argument struct */ |
dbae4c73 | 973 | return nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 LT |
974 | out_bad: |
975 | while (!list_empty(head)) { | |
10afec90 | 976 | req = nfs_list_entry(head->next); |
1da177e4 | 977 | nfs_list_remove_request(req); |
61822ab5 | 978 | nfs_redirty_request(req); |
1da177e4 LT |
979 | } |
980 | return -ENOMEM; | |
981 | } | |
982 | ||
c63c7b05 TM |
983 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, |
984 | struct inode *inode, int ioflags) | |
1da177e4 | 985 | { |
bf4285e7 | 986 | size_t wsize = NFS_SERVER(inode)->wsize; |
1da177e4 | 987 | |
bcb71bba | 988 | if (wsize < PAGE_CACHE_SIZE) |
c63c7b05 | 989 | nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); |
bcb71bba | 990 | else |
c63c7b05 | 991 | nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); |
1da177e4 LT |
992 | } |
993 | ||
994 | /* | |
995 | * Handle a write reply that flushed part of a page. | |
996 | */ | |
788e7a89 | 997 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 998 | { |
788e7a89 | 999 | struct nfs_write_data *data = calldata; |
1da177e4 | 1000 | |
48186c7d CL |
1001 | dprintk("NFS: %5u write(%s/%lld %d@%lld)", |
1002 | task->tk_pid, | |
1003 | data->req->wb_context->path.dentry->d_inode->i_sb->s_id, | |
1004 | (long long) | |
1005 | NFS_FILEID(data->req->wb_context->path.dentry->d_inode), | |
1006 | data->req->wb_bytes, (long long)req_offset(data->req)); | |
1da177e4 | 1007 | |
c9d8f89d TM |
1008 | nfs_writeback_done(task, data); |
1009 | } | |
788e7a89 | 1010 | |
c9d8f89d TM |
1011 | static void nfs_writeback_release_partial(void *calldata) |
1012 | { | |
1013 | struct nfs_write_data *data = calldata; | |
1014 | struct nfs_page *req = data->req; | |
1015 | struct page *page = req->wb_page; | |
1016 | int status = data->task.tk_status; | |
1017 | ||
1018 | if (status < 0) { | |
a301b777 | 1019 | nfs_set_pageerror(page); |
c9d8f89d TM |
1020 | nfs_context_set_write_error(req->wb_context, status); |
1021 | dprintk(", error = %d\n", status); | |
8e821cad | 1022 | goto out; |
1da177e4 LT |
1023 | } |
1024 | ||
8e821cad | 1025 | if (nfs_write_need_commit(data)) { |
587142f8 | 1026 | struct inode *inode = page->mapping->host; |
8e821cad | 1027 | |
587142f8 | 1028 | spin_lock(&inode->i_lock); |
8e821cad TM |
1029 | if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { |
1030 | /* Do nothing we need to resend the writes */ | |
1031 | } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
1032 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1033 | dprintk(" defer commit\n"); | |
1034 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
1035 | set_bit(PG_NEED_RESCHED, &req->wb_flags); | |
1036 | clear_bit(PG_NEED_COMMIT, &req->wb_flags); | |
1037 | dprintk(" server reboot detected\n"); | |
1038 | } | |
587142f8 | 1039 | spin_unlock(&inode->i_lock); |
8e821cad TM |
1040 | } else |
1041 | dprintk(" OK\n"); | |
1042 | ||
1043 | out: | |
1da177e4 LT |
1044 | if (atomic_dec_and_test(&req->wb_complete)) |
1045 | nfs_writepage_release(req); | |
c9d8f89d | 1046 | nfs_writedata_release(calldata); |
1da177e4 LT |
1047 | } |
1048 | ||
def6ed7e AA |
1049 | #if defined(CONFIG_NFS_V4_1) |
1050 | void nfs_write_prepare(struct rpc_task *task, void *calldata) | |
1051 | { | |
1052 | struct nfs_write_data *data = calldata; | |
def6ed7e | 1053 | |
035168ab TM |
1054 | if (nfs4_setup_sequence(NFS_SERVER(data->inode), |
1055 | &data->args.seq_args, | |
def6ed7e AA |
1056 | &data->res.seq_res, 1, task)) |
1057 | return; | |
1058 | rpc_call_start(task); | |
1059 | } | |
1060 | #endif /* CONFIG_NFS_V4_1 */ | |
1061 | ||
788e7a89 | 1062 | static const struct rpc_call_ops nfs_write_partial_ops = { |
def6ed7e AA |
1063 | #if defined(CONFIG_NFS_V4_1) |
1064 | .rpc_call_prepare = nfs_write_prepare, | |
1065 | #endif /* CONFIG_NFS_V4_1 */ | |
788e7a89 | 1066 | .rpc_call_done = nfs_writeback_done_partial, |
c9d8f89d | 1067 | .rpc_release = nfs_writeback_release_partial, |
788e7a89 TM |
1068 | }; |
1069 | ||
1da177e4 LT |
1070 | /* |
1071 | * Handle a write reply that flushes a whole page. | |
1072 | * | |
1073 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
1074 | * writebacks since the page->count is kept > 1 for as long | |
1075 | * as the page has a write request pending. | |
1076 | */ | |
788e7a89 | 1077 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 1078 | { |
788e7a89 | 1079 | struct nfs_write_data *data = calldata; |
1da177e4 | 1080 | |
c9d8f89d TM |
1081 | nfs_writeback_done(task, data); |
1082 | } | |
1083 | ||
1084 | static void nfs_writeback_release_full(void *calldata) | |
1085 | { | |
1086 | struct nfs_write_data *data = calldata; | |
1087 | int status = data->task.tk_status; | |
788e7a89 | 1088 | |
1da177e4 LT |
1089 | /* Update attributes as result of writeback. */ |
1090 | while (!list_empty(&data->pages)) { | |
c9d8f89d TM |
1091 | struct nfs_page *req = nfs_list_entry(data->pages.next); |
1092 | struct page *page = req->wb_page; | |
1093 | ||
1da177e4 | 1094 | nfs_list_remove_request(req); |
1da177e4 | 1095 | |
48186c7d CL |
1096 | dprintk("NFS: %5u write (%s/%lld %d@%lld)", |
1097 | data->task.tk_pid, | |
88be9f99 TM |
1098 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1099 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1100 | req->wb_bytes, |
1101 | (long long)req_offset(req)); | |
1102 | ||
c9d8f89d | 1103 | if (status < 0) { |
a301b777 | 1104 | nfs_set_pageerror(page); |
c9d8f89d TM |
1105 | nfs_context_set_write_error(req->wb_context, status); |
1106 | dprintk(", error = %d\n", status); | |
8e821cad | 1107 | goto remove_request; |
1da177e4 | 1108 | } |
1da177e4 | 1109 | |
8e821cad TM |
1110 | if (nfs_write_need_commit(data)) { |
1111 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1112 | nfs_mark_request_commit(req); | |
8e821cad | 1113 | dprintk(" marked for commit\n"); |
1da177e4 LT |
1114 | goto next; |
1115 | } | |
8e821cad TM |
1116 | dprintk(" OK\n"); |
1117 | remove_request: | |
1da177e4 | 1118 | nfs_inode_remove_request(req); |
1da177e4 | 1119 | next: |
9fd367f0 | 1120 | nfs_clear_page_tag_locked(req); |
a6305ddb | 1121 | nfs_end_page_writeback(page); |
1da177e4 | 1122 | } |
c9d8f89d | 1123 | nfs_writedata_release(calldata); |
1da177e4 LT |
1124 | } |
1125 | ||
788e7a89 | 1126 | static const struct rpc_call_ops nfs_write_full_ops = { |
def6ed7e AA |
1127 | #if defined(CONFIG_NFS_V4_1) |
1128 | .rpc_call_prepare = nfs_write_prepare, | |
1129 | #endif /* CONFIG_NFS_V4_1 */ | |
788e7a89 | 1130 | .rpc_call_done = nfs_writeback_done_full, |
c9d8f89d | 1131 | .rpc_release = nfs_writeback_release_full, |
788e7a89 TM |
1132 | }; |
1133 | ||
1134 | ||
1da177e4 LT |
1135 | /* |
1136 | * This function is called when the WRITE call is complete. | |
1137 | */ | |
462d5b32 | 1138 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1139 | { |
1da177e4 LT |
1140 | struct nfs_writeargs *argp = &data->args; |
1141 | struct nfs_writeres *resp = &data->res; | |
eedc020e | 1142 | struct nfs_server *server = NFS_SERVER(data->inode); |
788e7a89 | 1143 | int status; |
1da177e4 | 1144 | |
a3f565b1 | 1145 | dprintk("NFS: %5u nfs_writeback_done (status %d)\n", |
1da177e4 LT |
1146 | task->tk_pid, task->tk_status); |
1147 | ||
f551e44f CL |
1148 | /* |
1149 | * ->write_done will attempt to use post-op attributes to detect | |
1150 | * conflicting writes by other clients. A strict interpretation | |
1151 | * of close-to-open would allow us to continue caching even if | |
1152 | * another writer had changed the file, but some applications | |
1153 | * depend on tighter cache coherency when writing. | |
1154 | */ | |
788e7a89 TM |
1155 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1156 | if (status != 0) | |
1157 | return status; | |
91d5b470 CL |
1158 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1159 | ||
1da177e4 LT |
1160 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1161 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1162 | /* We tried a write call, but the server did not | |
1163 | * commit data to stable storage even though we | |
1164 | * requested it. | |
1165 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1166 | * the server reports NFS_DATA_SYNC, but performs | |
1167 | * NFS_FILE_SYNC. We therefore implement this checking | |
1168 | * as a dprintk() in order to avoid filling syslog. | |
1169 | */ | |
1170 | static unsigned long complain; | |
1171 | ||
1172 | if (time_before(complain, jiffies)) { | |
48186c7d | 1173 | dprintk("NFS: faulty NFS server %s:" |
1da177e4 | 1174 | " (committed = %d) != (stable = %d)\n", |
eedc020e | 1175 | server->nfs_client->cl_hostname, |
1da177e4 LT |
1176 | resp->verf->committed, argp->stable); |
1177 | complain = jiffies + 300 * HZ; | |
1178 | } | |
1179 | } | |
1180 | #endif | |
1181 | /* Is this a short write? */ | |
1182 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1183 | static unsigned long complain; | |
1184 | ||
91d5b470 CL |
1185 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1186 | ||
1da177e4 LT |
1187 | /* Has the server at least made some progress? */ |
1188 | if (resp->count != 0) { | |
1189 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1190 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1191 | /* Resend from where the server left off */ | |
1192 | argp->offset += resp->count; | |
1193 | argp->pgbase += resp->count; | |
1194 | argp->count -= resp->count; | |
1195 | } else { | |
1196 | /* Resend as a stable write in order to avoid | |
1197 | * headaches in the case of a server crash. | |
1198 | */ | |
1199 | argp->stable = NFS_FILE_SYNC; | |
1200 | } | |
0110ee15 | 1201 | nfs_restart_rpc(task, server->nfs_client); |
788e7a89 | 1202 | return -EAGAIN; |
1da177e4 LT |
1203 | } |
1204 | if (time_before(complain, jiffies)) { | |
1205 | printk(KERN_WARNING | |
1206 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1207 | argp->count); | |
1208 | complain = jiffies + 300 * HZ; | |
1209 | } | |
1210 | /* Can't do anything about it except throw an error. */ | |
1211 | task->tk_status = -EIO; | |
1212 | } | |
788e7a89 | 1213 | return 0; |
1da177e4 LT |
1214 | } |
1215 | ||
1216 | ||
1217 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
71d0a611 TM |
1218 | static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait) |
1219 | { | |
1220 | if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags)) | |
1221 | return 1; | |
1222 | if (may_wait && !out_of_line_wait_on_bit_lock(&nfsi->flags, | |
1223 | NFS_INO_COMMIT, nfs_wait_bit_killable, | |
1224 | TASK_KILLABLE)) | |
1225 | return 1; | |
1226 | return 0; | |
1227 | } | |
1228 | ||
1229 | static void nfs_commit_clear_lock(struct nfs_inode *nfsi) | |
1230 | { | |
1231 | clear_bit(NFS_INO_COMMIT, &nfsi->flags); | |
1232 | smp_mb__after_clear_bit(); | |
1233 | wake_up_bit(&nfsi->flags, NFS_INO_COMMIT); | |
1234 | } | |
1235 | ||
1236 | ||
0aa05887 | 1237 | static void nfs_commitdata_release(void *data) |
1da177e4 | 1238 | { |
383ba719 TM |
1239 | struct nfs_write_data *wdata = data; |
1240 | ||
1241 | put_nfs_open_context(wdata->args.context); | |
1da177e4 LT |
1242 | nfs_commit_free(wdata); |
1243 | } | |
1244 | ||
1245 | /* | |
1246 | * Set up the argument/result storage required for the RPC call. | |
1247 | */ | |
dbae4c73 | 1248 | static int nfs_commit_rpcsetup(struct list_head *head, |
788e7a89 TM |
1249 | struct nfs_write_data *data, |
1250 | int how) | |
1da177e4 | 1251 | { |
84115e1c TM |
1252 | struct nfs_page *first = nfs_list_entry(head->next); |
1253 | struct inode *inode = first->wb_context->path.dentry->d_inode; | |
3ff7576d | 1254 | int priority = flush_task_priority(how); |
07737691 | 1255 | struct rpc_task *task; |
bdc7f021 TM |
1256 | struct rpc_message msg = { |
1257 | .rpc_argp = &data->args, | |
1258 | .rpc_resp = &data->res, | |
1259 | .rpc_cred = first->wb_context->cred, | |
1260 | }; | |
84115e1c | 1261 | struct rpc_task_setup task_setup_data = { |
07737691 | 1262 | .task = &data->task, |
84115e1c | 1263 | .rpc_client = NFS_CLIENT(inode), |
bdc7f021 | 1264 | .rpc_message = &msg, |
84115e1c TM |
1265 | .callback_ops = &nfs_commit_ops, |
1266 | .callback_data = data, | |
101070ca | 1267 | .workqueue = nfsiod_workqueue, |
2c61be0a | 1268 | .flags = RPC_TASK_ASYNC, |
3ff7576d | 1269 | .priority = priority, |
84115e1c | 1270 | }; |
1da177e4 LT |
1271 | |
1272 | /* Set up the RPC argument and reply structs | |
1273 | * NB: take care not to mess about with data->commit et al. */ | |
1274 | ||
1275 | list_splice_init(head, &data->pages); | |
1da177e4 | 1276 | |
1da177e4 | 1277 | data->inode = inode; |
bdc7f021 | 1278 | data->cred = msg.rpc_cred; |
1da177e4 LT |
1279 | |
1280 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1281 | /* Note: we always request a commit of the entire inode */ |
1282 | data->args.offset = 0; | |
1283 | data->args.count = 0; | |
383ba719 | 1284 | data->args.context = get_nfs_open_context(first->wb_context); |
3da28eb1 | 1285 | data->res.count = 0; |
1da177e4 LT |
1286 | data->res.fattr = &data->fattr; |
1287 | data->res.verf = &data->verf; | |
0e574af1 | 1288 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1289 | |
1290 | /* Set up the initial task struct. */ | |
bdc7f021 | 1291 | NFS_PROTO(inode)->commit_setup(data, &msg); |
1da177e4 | 1292 | |
a3f565b1 | 1293 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); |
bdc7f021 | 1294 | |
07737691 | 1295 | task = rpc_run_task(&task_setup_data); |
dbae4c73 TM |
1296 | if (IS_ERR(task)) |
1297 | return PTR_ERR(task); | |
1298 | rpc_put_task(task); | |
1299 | return 0; | |
1da177e4 LT |
1300 | } |
1301 | ||
1302 | /* | |
1303 | * Commit dirty pages | |
1304 | */ | |
1305 | static int | |
40859d7e | 1306 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1307 | { |
1308 | struct nfs_write_data *data; | |
1309 | struct nfs_page *req; | |
1310 | ||
c9d8f89d | 1311 | data = nfs_commitdata_alloc(); |
1da177e4 LT |
1312 | |
1313 | if (!data) | |
1314 | goto out_bad; | |
1315 | ||
1316 | /* Set up the argument struct */ | |
dbae4c73 | 1317 | return nfs_commit_rpcsetup(head, data, how); |
1da177e4 LT |
1318 | out_bad: |
1319 | while (!list_empty(head)) { | |
1320 | req = nfs_list_entry(head->next); | |
1321 | nfs_list_remove_request(req); | |
1322 | nfs_mark_request_commit(req); | |
83715ad5 | 1323 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 PZ |
1324 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
1325 | BDI_RECLAIMABLE); | |
9fd367f0 | 1326 | nfs_clear_page_tag_locked(req); |
1da177e4 | 1327 | } |
71d0a611 | 1328 | nfs_commit_clear_lock(NFS_I(inode)); |
1da177e4 LT |
1329 | return -ENOMEM; |
1330 | } | |
1331 | ||
1332 | /* | |
1333 | * COMMIT call returned | |
1334 | */ | |
788e7a89 | 1335 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1336 | { |
963d8fe5 | 1337 | struct nfs_write_data *data = calldata; |
1da177e4 | 1338 | |
a3f565b1 | 1339 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
1da177e4 LT |
1340 | task->tk_pid, task->tk_status); |
1341 | ||
788e7a89 TM |
1342 | /* Call the NFS version-specific code */ |
1343 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1344 | return; | |
c9d8f89d TM |
1345 | } |
1346 | ||
1347 | static void nfs_commit_release(void *calldata) | |
1348 | { | |
1349 | struct nfs_write_data *data = calldata; | |
1350 | struct nfs_page *req; | |
1351 | int status = data->task.tk_status; | |
788e7a89 | 1352 | |
1da177e4 LT |
1353 | while (!list_empty(&data->pages)) { |
1354 | req = nfs_list_entry(data->pages.next); | |
1355 | nfs_list_remove_request(req); | |
e468bae9 | 1356 | nfs_clear_request_commit(req); |
1da177e4 | 1357 | |
48186c7d | 1358 | dprintk("NFS: commit (%s/%lld %d@%lld)", |
88be9f99 TM |
1359 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1360 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1361 | req->wb_bytes, |
1362 | (long long)req_offset(req)); | |
c9d8f89d TM |
1363 | if (status < 0) { |
1364 | nfs_context_set_write_error(req->wb_context, status); | |
1da177e4 | 1365 | nfs_inode_remove_request(req); |
c9d8f89d | 1366 | dprintk(", error = %d\n", status); |
1da177e4 LT |
1367 | goto next; |
1368 | } | |
1369 | ||
1370 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1371 | * returned by the server against all stored verfs. */ | |
1372 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1373 | /* We have a match */ | |
1374 | nfs_inode_remove_request(req); | |
1375 | dprintk(" OK\n"); | |
1376 | goto next; | |
1377 | } | |
1378 | /* We have a mismatch. Write the page again */ | |
1379 | dprintk(" mismatch\n"); | |
6d884e8f | 1380 | nfs_mark_request_dirty(req); |
1da177e4 | 1381 | next: |
9fd367f0 | 1382 | nfs_clear_page_tag_locked(req); |
1da177e4 | 1383 | } |
71d0a611 | 1384 | nfs_commit_clear_lock(NFS_I(data->inode)); |
c9d8f89d | 1385 | nfs_commitdata_release(calldata); |
1da177e4 | 1386 | } |
788e7a89 TM |
1387 | |
1388 | static const struct rpc_call_ops nfs_commit_ops = { | |
21d9a851 AA |
1389 | #if defined(CONFIG_NFS_V4_1) |
1390 | .rpc_call_prepare = nfs_write_prepare, | |
1391 | #endif /* CONFIG_NFS_V4_1 */ | |
788e7a89 TM |
1392 | .rpc_call_done = nfs_commit_done, |
1393 | .rpc_release = nfs_commit_release, | |
1394 | }; | |
1da177e4 | 1395 | |
b608b283 | 1396 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 | 1397 | { |
1da177e4 | 1398 | LIST_HEAD(head); |
71d0a611 TM |
1399 | int may_wait = how & FLUSH_SYNC; |
1400 | int res = 0; | |
1da177e4 | 1401 | |
71d0a611 | 1402 | if (!nfs_commit_set_lock(NFS_I(inode), may_wait)) |
c5efa5fc | 1403 | goto out_mark_dirty; |
587142f8 | 1404 | spin_lock(&inode->i_lock); |
3da28eb1 | 1405 | res = nfs_scan_commit(inode, &head, 0, 0); |
587142f8 | 1406 | spin_unlock(&inode->i_lock); |
1da177e4 | 1407 | if (res) { |
7d46a49f | 1408 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1409 | if (error < 0) |
1410 | return error; | |
71d0a611 TM |
1411 | if (may_wait) |
1412 | wait_on_bit(&NFS_I(inode)->flags, NFS_INO_COMMIT, | |
1413 | nfs_wait_bit_killable, | |
1414 | TASK_KILLABLE); | |
c5efa5fc TM |
1415 | else |
1416 | goto out_mark_dirty; | |
71d0a611 TM |
1417 | } else |
1418 | nfs_commit_clear_lock(NFS_I(inode)); | |
c5efa5fc TM |
1419 | return res; |
1420 | /* Note: If we exit without ensuring that the commit is complete, | |
1421 | * we must mark the inode as dirty. Otherwise, future calls to | |
1422 | * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure | |
1423 | * that the data is on the disk. | |
1424 | */ | |
1425 | out_mark_dirty: | |
1426 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); | |
1da177e4 LT |
1427 | return res; |
1428 | } | |
8fc795f7 TM |
1429 | |
1430 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) | |
1431 | { | |
420e3646 TM |
1432 | struct nfs_inode *nfsi = NFS_I(inode); |
1433 | int flags = FLUSH_SYNC; | |
1434 | int ret = 0; | |
8fc795f7 | 1435 | |
420e3646 TM |
1436 | /* Don't commit yet if this is a non-blocking flush and there are |
1437 | * lots of outstanding writes for this mapping. | |
1438 | */ | |
1439 | if (wbc->sync_mode == WB_SYNC_NONE && | |
1440 | nfsi->ncommit <= (nfsi->npages >> 1)) | |
1441 | goto out_mark_dirty; | |
1442 | ||
5bad5abe | 1443 | if (wbc->nonblocking || wbc->for_background) |
420e3646 TM |
1444 | flags = 0; |
1445 | ret = nfs_commit_inode(inode, flags); | |
1446 | if (ret >= 0) { | |
1447 | if (wbc->sync_mode == WB_SYNC_NONE) { | |
1448 | if (ret < wbc->nr_to_write) | |
1449 | wbc->nr_to_write -= ret; | |
1450 | else | |
1451 | wbc->nr_to_write = 0; | |
1452 | } | |
8fc795f7 | 1453 | return 0; |
420e3646 TM |
1454 | } |
1455 | out_mark_dirty: | |
8fc795f7 TM |
1456 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1457 | return ret; | |
1458 | } | |
c63c7b05 | 1459 | #else |
8fc795f7 TM |
1460 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) |
1461 | { | |
1462 | return 0; | |
1463 | } | |
1da177e4 LT |
1464 | #endif |
1465 | ||
8fc795f7 TM |
1466 | int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1467 | { | |
1468 | return nfs_commit_unstable_pages(inode, wbc); | |
1469 | } | |
1470 | ||
acdc53b2 TM |
1471 | /* |
1472 | * flush the inode to disk. | |
1473 | */ | |
1474 | int nfs_wb_all(struct inode *inode) | |
34901f70 TM |
1475 | { |
1476 | struct writeback_control wbc = { | |
72cb77f4 | 1477 | .sync_mode = WB_SYNC_ALL, |
34901f70 | 1478 | .nr_to_write = LONG_MAX, |
d7fb1207 TM |
1479 | .range_start = 0, |
1480 | .range_end = LLONG_MAX, | |
34901f70 | 1481 | }; |
34901f70 | 1482 | |
acdc53b2 | 1483 | return sync_inode(inode, &wbc); |
1c75950b TM |
1484 | } |
1485 | ||
1b3b4a1a TM |
1486 | int nfs_wb_page_cancel(struct inode *inode, struct page *page) |
1487 | { | |
1488 | struct nfs_page *req; | |
1b3b4a1a TM |
1489 | int ret = 0; |
1490 | ||
1491 | BUG_ON(!PageLocked(page)); | |
1492 | for (;;) { | |
ba8b06e6 | 1493 | wait_on_page_writeback(page); |
1b3b4a1a TM |
1494 | req = nfs_page_find_request(page); |
1495 | if (req == NULL) | |
1b3b4a1a | 1496 | break; |
1b3b4a1a TM |
1497 | if (nfs_lock_request_dontget(req)) { |
1498 | nfs_inode_remove_request(req); | |
1499 | /* | |
1500 | * In case nfs_inode_remove_request has marked the | |
1501 | * page as being dirty | |
1502 | */ | |
1503 | cancel_dirty_page(page, PAGE_CACHE_SIZE); | |
1504 | nfs_unlock_request(req); | |
1505 | break; | |
1506 | } | |
1507 | ret = nfs_wait_on_request(req); | |
c9edda71 | 1508 | nfs_release_request(req); |
1b3b4a1a | 1509 | if (ret < 0) |
c988950e | 1510 | break; |
1b3b4a1a | 1511 | } |
1b3b4a1a TM |
1512 | return ret; |
1513 | } | |
1514 | ||
7f2f12d9 TM |
1515 | /* |
1516 | * Write back all requests on one page - we do this before reading it. | |
1517 | */ | |
1518 | int nfs_wb_page(struct inode *inode, struct page *page) | |
1c75950b TM |
1519 | { |
1520 | loff_t range_start = page_offset(page); | |
1521 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
4d770ccf | 1522 | struct writeback_control wbc = { |
4d770ccf | 1523 | .sync_mode = WB_SYNC_ALL, |
7f2f12d9 | 1524 | .nr_to_write = 0, |
4d770ccf TM |
1525 | .range_start = range_start, |
1526 | .range_end = range_end, | |
1527 | }; | |
1528 | int ret; | |
1c75950b | 1529 | |
0522f6ad | 1530 | for (;;) { |
ba8b06e6 | 1531 | wait_on_page_writeback(page); |
73e3302f TM |
1532 | if (clear_page_dirty_for_io(page)) { |
1533 | ret = nfs_writepage_locked(page, &wbc); | |
1534 | if (ret < 0) | |
1535 | goto out_error; | |
0522f6ad | 1536 | continue; |
7f2f12d9 | 1537 | } |
0522f6ad TM |
1538 | if (!PagePrivate(page)) |
1539 | break; | |
1540 | ret = nfs_commit_inode(inode, FLUSH_SYNC); | |
ba8b06e6 | 1541 | if (ret < 0) |
73e3302f | 1542 | goto out_error; |
7f2f12d9 | 1543 | } |
73e3302f TM |
1544 | return 0; |
1545 | out_error: | |
4d770ccf | 1546 | return ret; |
1c75950b TM |
1547 | } |
1548 | ||
074cc1de TM |
1549 | #ifdef CONFIG_MIGRATION |
1550 | int nfs_migrate_page(struct address_space *mapping, struct page *newpage, | |
1551 | struct page *page) | |
1552 | { | |
1553 | struct nfs_page *req; | |
1554 | int ret; | |
1555 | ||
7549ad5f | 1556 | nfs_fscache_release_page(page, GFP_KERNEL); |
074cc1de | 1557 | |
cfb506e1 | 1558 | req = nfs_find_and_lock_request(page, false); |
074cc1de TM |
1559 | ret = PTR_ERR(req); |
1560 | if (IS_ERR(req)) | |
1561 | goto out; | |
1562 | ||
1563 | ret = migrate_page(mapping, newpage, page); | |
1564 | if (!req) | |
1565 | goto out; | |
1566 | if (ret) | |
1567 | goto out_unlock; | |
1568 | page_cache_get(newpage); | |
190f38e5 | 1569 | spin_lock(&mapping->host->i_lock); |
074cc1de TM |
1570 | req->wb_page = newpage; |
1571 | SetPagePrivate(newpage); | |
190f38e5 | 1572 | set_page_private(newpage, (unsigned long)req); |
074cc1de TM |
1573 | ClearPagePrivate(page); |
1574 | set_page_private(page, 0); | |
190f38e5 | 1575 | spin_unlock(&mapping->host->i_lock); |
074cc1de TM |
1576 | page_cache_release(page); |
1577 | out_unlock: | |
1578 | nfs_clear_page_tag_locked(req); | |
074cc1de TM |
1579 | out: |
1580 | return ret; | |
1581 | } | |
1582 | #endif | |
1583 | ||
f7b422b1 | 1584 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1585 | { |
1586 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1587 | sizeof(struct nfs_write_data), | |
1588 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1589 | NULL); |
1da177e4 LT |
1590 | if (nfs_wdata_cachep == NULL) |
1591 | return -ENOMEM; | |
1592 | ||
93d2341c MD |
1593 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1594 | nfs_wdata_cachep); | |
1da177e4 LT |
1595 | if (nfs_wdata_mempool == NULL) |
1596 | return -ENOMEM; | |
1597 | ||
93d2341c MD |
1598 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1599 | nfs_wdata_cachep); | |
1da177e4 LT |
1600 | if (nfs_commit_mempool == NULL) |
1601 | return -ENOMEM; | |
1602 | ||
89a09141 PZ |
1603 | /* |
1604 | * NFS congestion size, scale with available memory. | |
1605 | * | |
1606 | * 64MB: 8192k | |
1607 | * 128MB: 11585k | |
1608 | * 256MB: 16384k | |
1609 | * 512MB: 23170k | |
1610 | * 1GB: 32768k | |
1611 | * 2GB: 46340k | |
1612 | * 4GB: 65536k | |
1613 | * 8GB: 92681k | |
1614 | * 16GB: 131072k | |
1615 | * | |
1616 | * This allows larger machines to have larger/more transfers. | |
1617 | * Limit the default to 256M | |
1618 | */ | |
1619 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); | |
1620 | if (nfs_congestion_kb > 256*1024) | |
1621 | nfs_congestion_kb = 256*1024; | |
1622 | ||
1da177e4 LT |
1623 | return 0; |
1624 | } | |
1625 | ||
266bee88 | 1626 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1627 | { |
1628 | mempool_destroy(nfs_commit_mempool); | |
1629 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1630 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1631 | } |
1632 |