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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/write.c | |
3 | * | |
7c85d900 | 4 | * Write file data over NFS. |
1da177e4 LT |
5 | * |
6 | * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de> | |
7 | */ | |
8 | ||
1da177e4 LT |
9 | #include <linux/types.h> |
10 | #include <linux/slab.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/pagemap.h> | |
13 | #include <linux/file.h> | |
1da177e4 | 14 | #include <linux/writeback.h> |
89a09141 | 15 | #include <linux/swap.h> |
1da177e4 LT |
16 | |
17 | #include <linux/sunrpc/clnt.h> | |
18 | #include <linux/nfs_fs.h> | |
19 | #include <linux/nfs_mount.h> | |
20 | #include <linux/nfs_page.h> | |
3fcfab16 AM |
21 | #include <linux/backing-dev.h> |
22 | ||
1da177e4 | 23 | #include <asm/uaccess.h> |
1da177e4 LT |
24 | |
25 | #include "delegation.h" | |
49a70f27 | 26 | #include "internal.h" |
91d5b470 | 27 | #include "iostat.h" |
1da177e4 LT |
28 | |
29 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE | |
30 | ||
31 | #define MIN_POOL_WRITE (32) | |
32 | #define MIN_POOL_COMMIT (4) | |
33 | ||
34 | /* | |
35 | * Local function declarations | |
36 | */ | |
37 | static struct nfs_page * nfs_update_request(struct nfs_open_context*, | |
1da177e4 LT |
38 | struct page *, |
39 | unsigned int, unsigned int); | |
c63c7b05 TM |
40 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *desc, |
41 | struct inode *inode, int ioflags); | |
788e7a89 TM |
42 | static const struct rpc_call_ops nfs_write_partial_ops; |
43 | static const struct rpc_call_ops nfs_write_full_ops; | |
44 | static const struct rpc_call_ops nfs_commit_ops; | |
1da177e4 | 45 | |
e18b890b | 46 | static struct kmem_cache *nfs_wdata_cachep; |
3feb2d49 | 47 | static mempool_t *nfs_wdata_mempool; |
1da177e4 LT |
48 | static mempool_t *nfs_commit_mempool; |
49 | ||
e9f7bee1 | 50 | struct nfs_write_data *nfs_commit_alloc(void) |
1da177e4 | 51 | { |
e6b4f8da | 52 | struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS); |
40859d7e | 53 | |
1da177e4 LT |
54 | if (p) { |
55 | memset(p, 0, sizeof(*p)); | |
56 | INIT_LIST_HEAD(&p->pages); | |
57 | } | |
58 | return p; | |
59 | } | |
60 | ||
10afec90 | 61 | static void nfs_commit_rcu_free(struct rcu_head *head) |
1da177e4 | 62 | { |
8aca67f0 | 63 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
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 | ||
8aca67f0 TM |
69 | void nfs_commit_free(struct nfs_write_data *wdata) |
70 | { | |
71 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_commit_rcu_free); | |
72 | } | |
73 | ||
8d5658c9 | 74 | struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount) |
3feb2d49 | 75 | { |
e6b4f8da | 76 | struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS); |
3feb2d49 TM |
77 | |
78 | if (p) { | |
79 | memset(p, 0, sizeof(*p)); | |
80 | INIT_LIST_HEAD(&p->pages); | |
e9f7bee1 | 81 | p->npages = pagecount; |
0d0b5cb3 CL |
82 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
83 | p->pagevec = p->page_array; | |
3feb2d49 | 84 | else { |
0d0b5cb3 CL |
85 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
86 | if (!p->pagevec) { | |
3feb2d49 TM |
87 | mempool_free(p, nfs_wdata_mempool); |
88 | p = NULL; | |
89 | } | |
90 | } | |
91 | } | |
92 | return p; | |
93 | } | |
94 | ||
8aca67f0 | 95 | static void nfs_writedata_rcu_free(struct rcu_head *head) |
3feb2d49 | 96 | { |
8aca67f0 | 97 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
3feb2d49 TM |
98 | if (p && (p->pagevec != &p->page_array[0])) |
99 | kfree(p->pagevec); | |
100 | mempool_free(p, nfs_wdata_mempool); | |
101 | } | |
102 | ||
8aca67f0 TM |
103 | static void nfs_writedata_free(struct nfs_write_data *wdata) |
104 | { | |
105 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_writedata_rcu_free); | |
106 | } | |
107 | ||
963d8fe5 | 108 | void nfs_writedata_release(void *wdata) |
1da177e4 | 109 | { |
1da177e4 LT |
110 | nfs_writedata_free(wdata); |
111 | } | |
112 | ||
7b159fc1 TM |
113 | static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error) |
114 | { | |
115 | ctx->error = error; | |
116 | smp_wmb(); | |
117 | set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
118 | } | |
119 | ||
277459d2 TM |
120 | static struct nfs_page *nfs_page_find_request_locked(struct page *page) |
121 | { | |
122 | struct nfs_page *req = NULL; | |
123 | ||
124 | if (PagePrivate(page)) { | |
125 | req = (struct nfs_page *)page_private(page); | |
126 | if (req != NULL) | |
c03b4024 | 127 | kref_get(&req->wb_kref); |
277459d2 TM |
128 | } |
129 | return req; | |
130 | } | |
131 | ||
132 | static struct nfs_page *nfs_page_find_request(struct page *page) | |
133 | { | |
587142f8 | 134 | struct inode *inode = page->mapping->host; |
277459d2 | 135 | struct nfs_page *req = NULL; |
277459d2 | 136 | |
587142f8 | 137 | spin_lock(&inode->i_lock); |
277459d2 | 138 | req = nfs_page_find_request_locked(page); |
587142f8 | 139 | spin_unlock(&inode->i_lock); |
277459d2 TM |
140 | return req; |
141 | } | |
142 | ||
1da177e4 LT |
143 | /* Adjust the file length if we're writing beyond the end */ |
144 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) | |
145 | { | |
146 | struct inode *inode = page->mapping->host; | |
147 | loff_t end, i_size = i_size_read(inode); | |
ca52fec1 | 148 | pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; |
1da177e4 LT |
149 | |
150 | if (i_size > 0 && page->index < end_index) | |
151 | return; | |
152 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); | |
153 | if (i_size >= end) | |
154 | return; | |
91d5b470 | 155 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
1da177e4 LT |
156 | i_size_write(inode, end); |
157 | } | |
158 | ||
a301b777 TM |
159 | /* A writeback failed: mark the page as bad, and invalidate the page cache */ |
160 | static void nfs_set_pageerror(struct page *page) | |
161 | { | |
162 | SetPageError(page); | |
163 | nfs_zap_mapping(page->mapping->host, page->mapping); | |
164 | } | |
165 | ||
1da177e4 LT |
166 | /* We can set the PG_uptodate flag if we see that a write request |
167 | * covers the full page. | |
168 | */ | |
169 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) | |
170 | { | |
1da177e4 LT |
171 | if (PageUptodate(page)) |
172 | return; | |
173 | if (base != 0) | |
174 | return; | |
49a70f27 | 175 | if (count != nfs_page_length(page)) |
1da177e4 | 176 | return; |
49a70f27 | 177 | if (count != PAGE_CACHE_SIZE) |
60945cb7 | 178 | zero_user_page(page, count, PAGE_CACHE_SIZE - count, KM_USER0); |
49a70f27 | 179 | SetPageUptodate(page); |
1da177e4 LT |
180 | } |
181 | ||
e21195a7 | 182 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
1da177e4 LT |
183 | unsigned int offset, unsigned int count) |
184 | { | |
185 | struct nfs_page *req; | |
e21195a7 | 186 | int ret; |
1da177e4 | 187 | |
e21195a7 TM |
188 | for (;;) { |
189 | req = nfs_update_request(ctx, page, offset, count); | |
190 | if (!IS_ERR(req)) | |
191 | break; | |
192 | ret = PTR_ERR(req); | |
193 | if (ret != -EBUSY) | |
194 | return ret; | |
195 | ret = nfs_wb_page(page->mapping->host, page); | |
196 | if (ret != 0) | |
197 | return ret; | |
198 | } | |
1da177e4 LT |
199 | /* Update file length */ |
200 | nfs_grow_file(page, offset, count); | |
1da177e4 | 201 | nfs_unlock_request(req); |
abd3e641 | 202 | return 0; |
1da177e4 LT |
203 | } |
204 | ||
205 | static int wb_priority(struct writeback_control *wbc) | |
206 | { | |
207 | if (wbc->for_reclaim) | |
c63c7b05 | 208 | return FLUSH_HIGHPRI | FLUSH_STABLE; |
1da177e4 LT |
209 | if (wbc->for_kupdate) |
210 | return FLUSH_LOWPRI; | |
211 | return 0; | |
212 | } | |
213 | ||
89a09141 PZ |
214 | /* |
215 | * NFS congestion control | |
216 | */ | |
217 | ||
218 | int nfs_congestion_kb; | |
219 | ||
220 | #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) | |
221 | #define NFS_CONGESTION_OFF_THRESH \ | |
222 | (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) | |
223 | ||
5a6d41b3 | 224 | static int nfs_set_page_writeback(struct page *page) |
89a09141 | 225 | { |
5a6d41b3 TM |
226 | int ret = test_set_page_writeback(page); |
227 | ||
228 | if (!ret) { | |
89a09141 PZ |
229 | struct inode *inode = page->mapping->host; |
230 | struct nfs_server *nfss = NFS_SERVER(inode); | |
231 | ||
277866a0 | 232 | if (atomic_long_inc_return(&nfss->writeback) > |
89a09141 PZ |
233 | NFS_CONGESTION_ON_THRESH) |
234 | set_bdi_congested(&nfss->backing_dev_info, WRITE); | |
235 | } | |
5a6d41b3 | 236 | return ret; |
89a09141 PZ |
237 | } |
238 | ||
239 | static void nfs_end_page_writeback(struct page *page) | |
240 | { | |
241 | struct inode *inode = page->mapping->host; | |
242 | struct nfs_server *nfss = NFS_SERVER(inode); | |
243 | ||
244 | end_page_writeback(page); | |
c4dc4bee | 245 | if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) |
89a09141 | 246 | clear_bdi_congested(&nfss->backing_dev_info, WRITE); |
89a09141 PZ |
247 | } |
248 | ||
e261f51f TM |
249 | /* |
250 | * Find an associated nfs write request, and prepare to flush it out | |
9cccef95 | 251 | * May return an error if the user signalled nfs_wait_on_request(). |
e261f51f | 252 | */ |
c63c7b05 TM |
253 | static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, |
254 | struct page *page) | |
e261f51f | 255 | { |
587142f8 TM |
256 | struct inode *inode = page->mapping->host; |
257 | struct nfs_inode *nfsi = NFS_I(inode); | |
e261f51f | 258 | struct nfs_page *req; |
e261f51f TM |
259 | int ret; |
260 | ||
587142f8 | 261 | spin_lock(&inode->i_lock); |
e261f51f TM |
262 | for(;;) { |
263 | req = nfs_page_find_request_locked(page); | |
264 | if (req == NULL) { | |
587142f8 | 265 | spin_unlock(&inode->i_lock); |
9cccef95 | 266 | return 0; |
e261f51f TM |
267 | } |
268 | if (nfs_lock_request_dontget(req)) | |
269 | break; | |
270 | /* Note: If we hold the page lock, as is the case in nfs_writepage, | |
271 | * then the call to nfs_lock_request_dontget() will always | |
272 | * succeed provided that someone hasn't already marked the | |
273 | * request as dirty (in which case we don't care). | |
274 | */ | |
587142f8 | 275 | spin_unlock(&inode->i_lock); |
e261f51f TM |
276 | ret = nfs_wait_on_request(req); |
277 | nfs_release_request(req); | |
278 | if (ret != 0) | |
279 | return ret; | |
587142f8 | 280 | spin_lock(&inode->i_lock); |
e261f51f | 281 | } |
612c9384 TM |
282 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
283 | /* This request is marked for commit */ | |
587142f8 | 284 | spin_unlock(&inode->i_lock); |
612c9384 | 285 | nfs_unlock_request(req); |
c63c7b05 | 286 | nfs_pageio_complete(pgio); |
9cccef95 | 287 | return 0; |
612c9384 | 288 | } |
c63c7b05 | 289 | if (nfs_set_page_writeback(page) != 0) { |
587142f8 | 290 | spin_unlock(&inode->i_lock); |
c63c7b05 TM |
291 | BUG(); |
292 | } | |
293 | radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, | |
9fd367f0 | 294 | NFS_PAGE_TAG_LOCKED); |
587142f8 | 295 | spin_unlock(&inode->i_lock); |
c63c7b05 | 296 | nfs_pageio_add_request(pgio, req); |
9cccef95 | 297 | return 0; |
e261f51f TM |
298 | } |
299 | ||
f758c885 | 300 | static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) |
1da177e4 | 301 | { |
1da177e4 | 302 | struct inode *inode = page->mapping->host; |
1da177e4 | 303 | |
91d5b470 CL |
304 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
305 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
306 | ||
7fe7f848 | 307 | nfs_pageio_cond_complete(pgio, page->index); |
f758c885 TM |
308 | return nfs_page_async_flush(pgio, page); |
309 | } | |
7fe7f848 | 310 | |
f758c885 TM |
311 | /* |
312 | * Write an mmapped page to the server. | |
313 | */ | |
314 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
315 | { | |
316 | struct nfs_pageio_descriptor pgio; | |
317 | int err; | |
49a70f27 | 318 | |
f758c885 TM |
319 | nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc)); |
320 | err = nfs_do_writepage(page, wbc, &pgio); | |
321 | nfs_pageio_complete(&pgio); | |
322 | if (err < 0) | |
323 | return err; | |
324 | if (pgio.pg_error < 0) | |
325 | return pgio.pg_error; | |
326 | return 0; | |
4d770ccf TM |
327 | } |
328 | ||
329 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
330 | { | |
f758c885 | 331 | int ret; |
4d770ccf | 332 | |
f758c885 | 333 | ret = nfs_writepage_locked(page, wbc); |
1da177e4 | 334 | unlock_page(page); |
f758c885 TM |
335 | return ret; |
336 | } | |
337 | ||
338 | static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) | |
339 | { | |
340 | int ret; | |
341 | ||
342 | ret = nfs_do_writepage(page, wbc, data); | |
343 | unlock_page(page); | |
344 | return ret; | |
1da177e4 LT |
345 | } |
346 | ||
1da177e4 LT |
347 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) |
348 | { | |
1da177e4 | 349 | struct inode *inode = mapping->host; |
c63c7b05 | 350 | struct nfs_pageio_descriptor pgio; |
1da177e4 LT |
351 | int err; |
352 | ||
91d5b470 CL |
353 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
354 | ||
c63c7b05 | 355 | nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); |
f758c885 | 356 | err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); |
c63c7b05 | 357 | nfs_pageio_complete(&pgio); |
f758c885 | 358 | if (err < 0) |
1da177e4 | 359 | return err; |
f758c885 | 360 | if (pgio.pg_error < 0) |
c63c7b05 TM |
361 | return pgio.pg_error; |
362 | return 0; | |
1da177e4 LT |
363 | } |
364 | ||
365 | /* | |
366 | * Insert a write request into an inode | |
367 | */ | |
368 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) | |
369 | { | |
370 | struct nfs_inode *nfsi = NFS_I(inode); | |
371 | int error; | |
372 | ||
373 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); | |
374 | BUG_ON(error == -EEXIST); | |
375 | if (error) | |
376 | return error; | |
377 | if (!nfsi->npages) { | |
378 | igrab(inode); | |
1da177e4 LT |
379 | if (nfs_have_delegation(inode, FMODE_WRITE)) |
380 | nfsi->change_attr++; | |
381 | } | |
deb7d638 | 382 | SetPagePrivate(req->wb_page); |
277459d2 | 383 | set_page_private(req->wb_page, (unsigned long)req); |
1da177e4 | 384 | nfsi->npages++; |
c03b4024 | 385 | kref_get(&req->wb_kref); |
1da177e4 LT |
386 | return 0; |
387 | } | |
388 | ||
389 | /* | |
89a09141 | 390 | * Remove a write request from an inode |
1da177e4 LT |
391 | */ |
392 | static void nfs_inode_remove_request(struct nfs_page *req) | |
393 | { | |
88be9f99 | 394 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
395 | struct nfs_inode *nfsi = NFS_I(inode); |
396 | ||
397 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
398 | ||
587142f8 | 399 | spin_lock(&inode->i_lock); |
277459d2 | 400 | set_page_private(req->wb_page, 0); |
deb7d638 | 401 | ClearPagePrivate(req->wb_page); |
1da177e4 LT |
402 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
403 | nfsi->npages--; | |
404 | if (!nfsi->npages) { | |
587142f8 | 405 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
406 | iput(inode); |
407 | } else | |
587142f8 | 408 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
409 | nfs_clear_request(req); |
410 | nfs_release_request(req); | |
411 | } | |
412 | ||
61822ab5 TM |
413 | static void |
414 | nfs_redirty_request(struct nfs_page *req) | |
415 | { | |
61822ab5 TM |
416 | __set_page_dirty_nobuffers(req->wb_page); |
417 | } | |
418 | ||
1da177e4 LT |
419 | /* |
420 | * Check if a request is dirty | |
421 | */ | |
422 | static inline int | |
423 | nfs_dirty_request(struct nfs_page *req) | |
424 | { | |
5a6d41b3 TM |
425 | struct page *page = req->wb_page; |
426 | ||
612c9384 | 427 | if (page == NULL || test_bit(PG_NEED_COMMIT, &req->wb_flags)) |
5a6d41b3 TM |
428 | return 0; |
429 | return !PageWriteback(req->wb_page); | |
1da177e4 LT |
430 | } |
431 | ||
432 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
433 | /* | |
434 | * Add a request to the inode's commit list. | |
435 | */ | |
436 | static void | |
437 | nfs_mark_request_commit(struct nfs_page *req) | |
438 | { | |
88be9f99 | 439 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
440 | struct nfs_inode *nfsi = NFS_I(inode); |
441 | ||
587142f8 | 442 | spin_lock(&inode->i_lock); |
1da177e4 | 443 | nfsi->ncommit++; |
612c9384 | 444 | set_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
5c369683 TM |
445 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
446 | req->wb_index, | |
447 | NFS_PAGE_TAG_COMMIT); | |
587142f8 | 448 | spin_unlock(&inode->i_lock); |
fd39fc85 | 449 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 | 450 | inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE); |
a1803044 | 451 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1da177e4 | 452 | } |
8e821cad TM |
453 | |
454 | static inline | |
455 | int nfs_write_need_commit(struct nfs_write_data *data) | |
456 | { | |
457 | return data->verf.committed != NFS_FILE_SYNC; | |
458 | } | |
459 | ||
460 | static inline | |
461 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
462 | { | |
612c9384 | 463 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
8e821cad TM |
464 | nfs_mark_request_commit(req); |
465 | return 1; | |
466 | } | |
467 | if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { | |
468 | nfs_redirty_request(req); | |
469 | return 1; | |
470 | } | |
471 | return 0; | |
472 | } | |
473 | #else | |
474 | static inline void | |
475 | nfs_mark_request_commit(struct nfs_page *req) | |
476 | { | |
477 | } | |
478 | ||
479 | static inline | |
480 | int nfs_write_need_commit(struct nfs_write_data *data) | |
481 | { | |
482 | return 0; | |
483 | } | |
484 | ||
485 | static inline | |
486 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
487 | { | |
488 | return 0; | |
489 | } | |
1da177e4 LT |
490 | #endif |
491 | ||
492 | /* | |
493 | * Wait for a request to complete. | |
494 | * | |
495 | * Interruptible by signals only if mounted with intr flag. | |
496 | */ | |
ca52fec1 | 497 | static int nfs_wait_on_requests_locked(struct inode *inode, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
498 | { |
499 | struct nfs_inode *nfsi = NFS_I(inode); | |
500 | struct nfs_page *req; | |
ca52fec1 | 501 | pgoff_t idx_end, next; |
1da177e4 LT |
502 | unsigned int res = 0; |
503 | int error; | |
504 | ||
505 | if (npages == 0) | |
506 | idx_end = ~0; | |
507 | else | |
508 | idx_end = idx_start + npages - 1; | |
509 | ||
1da177e4 | 510 | next = idx_start; |
9fd367f0 | 511 | while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_LOCKED)) { |
1da177e4 LT |
512 | if (req->wb_index > idx_end) |
513 | break; | |
514 | ||
515 | next = req->wb_index + 1; | |
c6a556b8 | 516 | BUG_ON(!NFS_WBACK_BUSY(req)); |
1da177e4 | 517 | |
c03b4024 | 518 | kref_get(&req->wb_kref); |
587142f8 | 519 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
520 | error = nfs_wait_on_request(req); |
521 | nfs_release_request(req); | |
587142f8 | 522 | spin_lock(&inode->i_lock); |
1da177e4 LT |
523 | if (error < 0) |
524 | return error; | |
1da177e4 LT |
525 | res++; |
526 | } | |
1da177e4 LT |
527 | return res; |
528 | } | |
529 | ||
83715ad5 TM |
530 | static void nfs_cancel_commit_list(struct list_head *head) |
531 | { | |
532 | struct nfs_page *req; | |
533 | ||
534 | while(!list_empty(head)) { | |
535 | req = nfs_list_entry(head->next); | |
b6dff26a | 536 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 PZ |
537 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
538 | BDI_RECLAIMABLE); | |
83715ad5 | 539 | nfs_list_remove_request(req); |
612c9384 | 540 | clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
83715ad5 | 541 | nfs_inode_remove_request(req); |
b6dff26a | 542 | nfs_unlock_request(req); |
83715ad5 TM |
543 | } |
544 | } | |
545 | ||
1da177e4 LT |
546 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
547 | /* | |
548 | * nfs_scan_commit - Scan an inode for commit requests | |
549 | * @inode: NFS inode to scan | |
550 | * @dst: destination list | |
551 | * @idx_start: lower bound of page->index to scan. | |
552 | * @npages: idx_start + npages sets the upper bound to scan. | |
553 | * | |
554 | * Moves requests from the inode's 'commit' request list. | |
555 | * The requests are *not* checked to ensure that they form a contiguous set. | |
556 | */ | |
557 | static int | |
ca52fec1 | 558 | nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
559 | { |
560 | struct nfs_inode *nfsi = NFS_I(inode); | |
3da28eb1 TM |
561 | int res = 0; |
562 | ||
563 | if (nfsi->ncommit != 0) { | |
5c369683 TM |
564 | res = nfs_scan_list(nfsi, dst, idx_start, npages, |
565 | NFS_PAGE_TAG_COMMIT); | |
3da28eb1 | 566 | nfsi->ncommit -= res; |
3da28eb1 | 567 | } |
1da177e4 LT |
568 | return res; |
569 | } | |
c42de9dd | 570 | #else |
ca52fec1 | 571 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
c42de9dd TM |
572 | { |
573 | return 0; | |
574 | } | |
1da177e4 LT |
575 | #endif |
576 | ||
1da177e4 LT |
577 | /* |
578 | * Try to update any existing write request, or create one if there is none. | |
579 | * In order to match, the request's credentials must match those of | |
580 | * the calling process. | |
581 | * | |
582 | * Note: Should always be called with the Page Lock held! | |
583 | */ | |
584 | static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, | |
e21195a7 | 585 | struct page *page, unsigned int offset, unsigned int bytes) |
1da177e4 | 586 | { |
89a09141 PZ |
587 | struct address_space *mapping = page->mapping; |
588 | struct inode *inode = mapping->host; | |
1da177e4 | 589 | struct nfs_page *req, *new = NULL; |
ca52fec1 | 590 | pgoff_t rqend, end; |
1da177e4 LT |
591 | |
592 | end = offset + bytes; | |
593 | ||
1da177e4 LT |
594 | for (;;) { |
595 | /* Loop over all inode entries and see if we find | |
596 | * A request for the page we wish to update | |
597 | */ | |
587142f8 | 598 | spin_lock(&inode->i_lock); |
277459d2 | 599 | req = nfs_page_find_request_locked(page); |
1da177e4 LT |
600 | if (req) { |
601 | if (!nfs_lock_request_dontget(req)) { | |
602 | int error; | |
277459d2 | 603 | |
587142f8 | 604 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
605 | error = nfs_wait_on_request(req); |
606 | nfs_release_request(req); | |
1dd594b2 NB |
607 | if (error < 0) { |
608 | if (new) | |
609 | nfs_release_request(new); | |
1da177e4 | 610 | return ERR_PTR(error); |
1dd594b2 | 611 | } |
1da177e4 LT |
612 | continue; |
613 | } | |
587142f8 | 614 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
615 | if (new) |
616 | nfs_release_request(new); | |
617 | break; | |
618 | } | |
619 | ||
620 | if (new) { | |
621 | int error; | |
622 | nfs_lock_request_dontget(new); | |
623 | error = nfs_inode_add_request(inode, new); | |
624 | if (error) { | |
587142f8 | 625 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
626 | nfs_unlock_request(new); |
627 | return ERR_PTR(error); | |
628 | } | |
587142f8 | 629 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
630 | return new; |
631 | } | |
587142f8 | 632 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
633 | |
634 | new = nfs_create_request(ctx, inode, page, offset, bytes); | |
635 | if (IS_ERR(new)) | |
636 | return new; | |
637 | } | |
638 | ||
639 | /* We have a request for our page. | |
640 | * If the creds don't match, or the | |
641 | * page addresses don't match, | |
642 | * tell the caller to wait on the conflicting | |
643 | * request. | |
644 | */ | |
645 | rqend = req->wb_offset + req->wb_bytes; | |
646 | if (req->wb_context != ctx | |
647 | || req->wb_page != page | |
648 | || !nfs_dirty_request(req) | |
649 | || offset > rqend || end < req->wb_offset) { | |
650 | nfs_unlock_request(req); | |
651 | return ERR_PTR(-EBUSY); | |
652 | } | |
653 | ||
654 | /* Okay, the request matches. Update the region */ | |
655 | if (offset < req->wb_offset) { | |
656 | req->wb_offset = offset; | |
657 | req->wb_pgbase = offset; | |
658 | req->wb_bytes = rqend - req->wb_offset; | |
659 | } | |
660 | ||
661 | if (end > rqend) | |
662 | req->wb_bytes = end - req->wb_offset; | |
663 | ||
664 | return req; | |
665 | } | |
666 | ||
667 | int nfs_flush_incompatible(struct file *file, struct page *page) | |
668 | { | |
cd3758e3 | 669 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 670 | struct nfs_page *req; |
1a54533e | 671 | int do_flush, status; |
1da177e4 LT |
672 | /* |
673 | * Look for a request corresponding to this page. If there | |
674 | * is one, and it belongs to another file, we flush it out | |
675 | * before we try to copy anything into the page. Do this | |
676 | * due to the lack of an ACCESS-type call in NFSv2. | |
677 | * Also do the same if we find a request from an existing | |
678 | * dropped page. | |
679 | */ | |
1a54533e TM |
680 | do { |
681 | req = nfs_page_find_request(page); | |
682 | if (req == NULL) | |
683 | return 0; | |
684 | do_flush = req->wb_page != page || req->wb_context != ctx | |
e261f51f | 685 | || !nfs_dirty_request(req); |
1da177e4 | 686 | nfs_release_request(req); |
1a54533e TM |
687 | if (!do_flush) |
688 | return 0; | |
689 | status = nfs_wb_page(page->mapping->host, page); | |
690 | } while (status == 0); | |
691 | return status; | |
1da177e4 LT |
692 | } |
693 | ||
694 | /* | |
695 | * Update and possibly write a cached page of an NFS file. | |
696 | * | |
697 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
698 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
699 | */ | |
700 | int nfs_updatepage(struct file *file, struct page *page, | |
701 | unsigned int offset, unsigned int count) | |
702 | { | |
cd3758e3 | 703 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 704 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
705 | int status = 0; |
706 | ||
91d5b470 CL |
707 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
708 | ||
1da177e4 | 709 | dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", |
01cce933 JJS |
710 | file->f_path.dentry->d_parent->d_name.name, |
711 | file->f_path.dentry->d_name.name, count, | |
0bbacc40 | 712 | (long long)(page_offset(page) +offset)); |
1da177e4 | 713 | |
1da177e4 LT |
714 | /* If we're not using byte range locks, and we know the page |
715 | * is entirely in cache, it may be more efficient to avoid | |
716 | * fragmenting write requests. | |
717 | */ | |
ab0a3dbe | 718 | if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) { |
49a70f27 | 719 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 720 | offset = 0; |
1da177e4 LT |
721 | } |
722 | ||
e21195a7 | 723 | status = nfs_writepage_setup(ctx, page, offset, count); |
e261f51f | 724 | __set_page_dirty_nobuffers(page); |
1da177e4 | 725 | |
1da177e4 LT |
726 | dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", |
727 | status, (long long)i_size_read(inode)); | |
728 | if (status < 0) | |
a301b777 | 729 | nfs_set_pageerror(page); |
1da177e4 LT |
730 | return status; |
731 | } | |
732 | ||
733 | static void nfs_writepage_release(struct nfs_page *req) | |
734 | { | |
1da177e4 | 735 | |
44dd151d TM |
736 | if (PageError(req->wb_page)) { |
737 | nfs_end_page_writeback(req->wb_page); | |
738 | nfs_inode_remove_request(req); | |
739 | } else if (!nfs_reschedule_unstable_write(req)) { | |
740 | /* Set the PG_uptodate flag */ | |
741 | nfs_mark_uptodate(req->wb_page, req->wb_pgbase, req->wb_bytes); | |
8e821cad TM |
742 | nfs_end_page_writeback(req->wb_page); |
743 | nfs_inode_remove_request(req); | |
744 | } else | |
745 | nfs_end_page_writeback(req->wb_page); | |
9fd367f0 | 746 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
747 | } |
748 | ||
749 | static inline int flush_task_priority(int how) | |
750 | { | |
751 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
752 | case FLUSH_HIGHPRI: | |
753 | return RPC_PRIORITY_HIGH; | |
754 | case FLUSH_LOWPRI: | |
755 | return RPC_PRIORITY_LOW; | |
756 | } | |
757 | return RPC_PRIORITY_NORMAL; | |
758 | } | |
759 | ||
760 | /* | |
761 | * Set up the argument/result storage required for the RPC call. | |
762 | */ | |
763 | static void nfs_write_rpcsetup(struct nfs_page *req, | |
764 | struct nfs_write_data *data, | |
788e7a89 | 765 | const struct rpc_call_ops *call_ops, |
1da177e4 LT |
766 | unsigned int count, unsigned int offset, |
767 | int how) | |
768 | { | |
1da177e4 | 769 | struct inode *inode; |
788e7a89 | 770 | int flags; |
1da177e4 LT |
771 | |
772 | /* Set up the RPC argument and reply structs | |
773 | * NB: take care not to mess about with data->commit et al. */ | |
774 | ||
775 | data->req = req; | |
88be9f99 | 776 | data->inode = inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
777 | data->cred = req->wb_context->cred; |
778 | ||
779 | data->args.fh = NFS_FH(inode); | |
780 | data->args.offset = req_offset(req) + offset; | |
781 | data->args.pgbase = req->wb_pgbase + offset; | |
782 | data->args.pages = data->pagevec; | |
783 | data->args.count = count; | |
784 | data->args.context = req->wb_context; | |
785 | ||
786 | data->res.fattr = &data->fattr; | |
787 | data->res.count = count; | |
788 | data->res.verf = &data->verf; | |
0e574af1 | 789 | nfs_fattr_init(&data->fattr); |
1da177e4 | 790 | |
788e7a89 TM |
791 | /* Set up the initial task struct. */ |
792 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
793 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data); | |
1da177e4 LT |
794 | NFS_PROTO(inode)->write_setup(data, how); |
795 | ||
796 | data->task.tk_priority = flush_task_priority(how); | |
797 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 798 | |
a3f565b1 CL |
799 | dprintk("NFS: %5u initiated write call " |
800 | "(req %s/%Ld, %u bytes @ offset %Lu)\n", | |
0bbacc40 | 801 | data->task.tk_pid, |
1da177e4 LT |
802 | inode->i_sb->s_id, |
803 | (long long)NFS_FILEID(inode), | |
804 | count, | |
805 | (unsigned long long)data->args.offset); | |
806 | } | |
807 | ||
808 | static void nfs_execute_write(struct nfs_write_data *data) | |
809 | { | |
810 | struct rpc_clnt *clnt = NFS_CLIENT(data->inode); | |
811 | sigset_t oldset; | |
812 | ||
813 | rpc_clnt_sigmask(clnt, &oldset); | |
1da177e4 | 814 | rpc_execute(&data->task); |
1da177e4 LT |
815 | rpc_clnt_sigunmask(clnt, &oldset); |
816 | } | |
817 | ||
818 | /* | |
819 | * Generate multiple small requests to write out a single | |
820 | * contiguous dirty area on one page. | |
821 | */ | |
8d5658c9 | 822 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
823 | { |
824 | struct nfs_page *req = nfs_list_entry(head->next); | |
825 | struct page *page = req->wb_page; | |
826 | struct nfs_write_data *data; | |
e9f7bee1 TM |
827 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
828 | unsigned int offset; | |
1da177e4 LT |
829 | int requests = 0; |
830 | LIST_HEAD(list); | |
831 | ||
832 | nfs_list_remove_request(req); | |
833 | ||
bcb71bba | 834 | nbytes = count; |
e9f7bee1 TM |
835 | do { |
836 | size_t len = min(nbytes, wsize); | |
837 | ||
8d5658c9 | 838 | data = nfs_writedata_alloc(1); |
1da177e4 LT |
839 | if (!data) |
840 | goto out_bad; | |
841 | list_add(&data->pages, &list); | |
842 | requests++; | |
e9f7bee1 TM |
843 | nbytes -= len; |
844 | } while (nbytes != 0); | |
1da177e4 LT |
845 | atomic_set(&req->wb_complete, requests); |
846 | ||
847 | ClearPageError(page); | |
1da177e4 | 848 | offset = 0; |
bcb71bba | 849 | nbytes = count; |
1da177e4 LT |
850 | do { |
851 | data = list_entry(list.next, struct nfs_write_data, pages); | |
852 | list_del_init(&data->pages); | |
853 | ||
854 | data->pagevec[0] = page; | |
1da177e4 | 855 | |
bcb71bba TM |
856 | if (nbytes < wsize) |
857 | wsize = nbytes; | |
858 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, | |
859 | wsize, offset, how); | |
860 | offset += wsize; | |
861 | nbytes -= wsize; | |
1da177e4 LT |
862 | nfs_execute_write(data); |
863 | } while (nbytes != 0); | |
864 | ||
865 | return 0; | |
866 | ||
867 | out_bad: | |
868 | while (!list_empty(&list)) { | |
869 | data = list_entry(list.next, struct nfs_write_data, pages); | |
870 | list_del(&data->pages); | |
8aca67f0 | 871 | nfs_writedata_release(data); |
1da177e4 | 872 | } |
61822ab5 | 873 | nfs_redirty_request(req); |
6d677e35 | 874 | nfs_end_page_writeback(req->wb_page); |
9fd367f0 | 875 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
876 | return -ENOMEM; |
877 | } | |
878 | ||
879 | /* | |
880 | * Create an RPC task for the given write request and kick it. | |
881 | * The page must have been locked by the caller. | |
882 | * | |
883 | * It may happen that the page we're passed is not marked dirty. | |
884 | * This is the case if nfs_updatepage detects a conflicting request | |
885 | * that has been written but not committed. | |
886 | */ | |
8d5658c9 | 887 | static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
888 | { |
889 | struct nfs_page *req; | |
890 | struct page **pages; | |
891 | struct nfs_write_data *data; | |
1da177e4 | 892 | |
8d5658c9 | 893 | data = nfs_writedata_alloc(npages); |
1da177e4 LT |
894 | if (!data) |
895 | goto out_bad; | |
896 | ||
897 | pages = data->pagevec; | |
1da177e4 LT |
898 | while (!list_empty(head)) { |
899 | req = nfs_list_entry(head->next); | |
900 | nfs_list_remove_request(req); | |
901 | nfs_list_add_request(req, &data->pages); | |
902 | ClearPageError(req->wb_page); | |
1da177e4 | 903 | *pages++ = req->wb_page; |
1da177e4 LT |
904 | } |
905 | req = nfs_list_entry(data->pages.next); | |
906 | ||
1da177e4 | 907 | /* Set up the argument struct */ |
788e7a89 | 908 | nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 LT |
909 | |
910 | nfs_execute_write(data); | |
911 | return 0; | |
912 | out_bad: | |
913 | while (!list_empty(head)) { | |
10afec90 | 914 | req = nfs_list_entry(head->next); |
1da177e4 | 915 | nfs_list_remove_request(req); |
61822ab5 | 916 | nfs_redirty_request(req); |
6d677e35 | 917 | nfs_end_page_writeback(req->wb_page); |
9fd367f0 | 918 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
919 | } |
920 | return -ENOMEM; | |
921 | } | |
922 | ||
c63c7b05 TM |
923 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, |
924 | struct inode *inode, int ioflags) | |
1da177e4 | 925 | { |
7d46a49f | 926 | int wsize = NFS_SERVER(inode)->wsize; |
1da177e4 | 927 | |
bcb71bba | 928 | if (wsize < PAGE_CACHE_SIZE) |
c63c7b05 | 929 | nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); |
bcb71bba | 930 | else |
c63c7b05 | 931 | nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); |
1da177e4 LT |
932 | } |
933 | ||
934 | /* | |
935 | * Handle a write reply that flushed part of a page. | |
936 | */ | |
788e7a89 | 937 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 938 | { |
788e7a89 | 939 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
940 | struct nfs_page *req = data->req; |
941 | struct page *page = req->wb_page; | |
942 | ||
943 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
88be9f99 TM |
944 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
945 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
946 | req->wb_bytes, |
947 | (long long)req_offset(req)); | |
948 | ||
788e7a89 TM |
949 | if (nfs_writeback_done(task, data) != 0) |
950 | return; | |
951 | ||
952 | if (task->tk_status < 0) { | |
a301b777 | 953 | nfs_set_pageerror(page); |
7b159fc1 | 954 | nfs_context_set_write_error(req->wb_context, task->tk_status); |
788e7a89 | 955 | dprintk(", error = %d\n", task->tk_status); |
8e821cad | 956 | goto out; |
1da177e4 LT |
957 | } |
958 | ||
8e821cad | 959 | if (nfs_write_need_commit(data)) { |
587142f8 | 960 | struct inode *inode = page->mapping->host; |
8e821cad | 961 | |
587142f8 | 962 | spin_lock(&inode->i_lock); |
8e821cad TM |
963 | if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { |
964 | /* Do nothing we need to resend the writes */ | |
965 | } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
966 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
967 | dprintk(" defer commit\n"); | |
968 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
969 | set_bit(PG_NEED_RESCHED, &req->wb_flags); | |
970 | clear_bit(PG_NEED_COMMIT, &req->wb_flags); | |
971 | dprintk(" server reboot detected\n"); | |
972 | } | |
587142f8 | 973 | spin_unlock(&inode->i_lock); |
8e821cad TM |
974 | } else |
975 | dprintk(" OK\n"); | |
976 | ||
977 | out: | |
1da177e4 LT |
978 | if (atomic_dec_and_test(&req->wb_complete)) |
979 | nfs_writepage_release(req); | |
980 | } | |
981 | ||
788e7a89 TM |
982 | static const struct rpc_call_ops nfs_write_partial_ops = { |
983 | .rpc_call_done = nfs_writeback_done_partial, | |
984 | .rpc_release = nfs_writedata_release, | |
985 | }; | |
986 | ||
1da177e4 LT |
987 | /* |
988 | * Handle a write reply that flushes a whole page. | |
989 | * | |
990 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
991 | * writebacks since the page->count is kept > 1 for as long | |
992 | * as the page has a write request pending. | |
993 | */ | |
788e7a89 | 994 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 995 | { |
788e7a89 | 996 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
997 | struct nfs_page *req; |
998 | struct page *page; | |
999 | ||
788e7a89 TM |
1000 | if (nfs_writeback_done(task, data) != 0) |
1001 | return; | |
1002 | ||
1da177e4 LT |
1003 | /* Update attributes as result of writeback. */ |
1004 | while (!list_empty(&data->pages)) { | |
1005 | req = nfs_list_entry(data->pages.next); | |
1006 | nfs_list_remove_request(req); | |
1007 | page = req->wb_page; | |
1008 | ||
1009 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
88be9f99 TM |
1010 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1011 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1012 | req->wb_bytes, |
1013 | (long long)req_offset(req)); | |
1014 | ||
788e7a89 | 1015 | if (task->tk_status < 0) { |
a301b777 | 1016 | nfs_set_pageerror(page); |
7b159fc1 | 1017 | nfs_context_set_write_error(req->wb_context, task->tk_status); |
788e7a89 | 1018 | dprintk(", error = %d\n", task->tk_status); |
8e821cad | 1019 | goto remove_request; |
1da177e4 | 1020 | } |
1da177e4 | 1021 | |
8e821cad TM |
1022 | if (nfs_write_need_commit(data)) { |
1023 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1024 | nfs_mark_request_commit(req); | |
1025 | nfs_end_page_writeback(page); | |
1026 | dprintk(" marked for commit\n"); | |
1da177e4 LT |
1027 | goto next; |
1028 | } | |
44dd151d TM |
1029 | /* Set the PG_uptodate flag? */ |
1030 | nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); | |
8e821cad TM |
1031 | dprintk(" OK\n"); |
1032 | remove_request: | |
1033 | nfs_end_page_writeback(page); | |
1da177e4 | 1034 | nfs_inode_remove_request(req); |
1da177e4 | 1035 | next: |
9fd367f0 | 1036 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
1037 | } |
1038 | } | |
1039 | ||
788e7a89 TM |
1040 | static const struct rpc_call_ops nfs_write_full_ops = { |
1041 | .rpc_call_done = nfs_writeback_done_full, | |
1042 | .rpc_release = nfs_writedata_release, | |
1043 | }; | |
1044 | ||
1045 | ||
1da177e4 LT |
1046 | /* |
1047 | * This function is called when the WRITE call is complete. | |
1048 | */ | |
462d5b32 | 1049 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1050 | { |
1da177e4 LT |
1051 | struct nfs_writeargs *argp = &data->args; |
1052 | struct nfs_writeres *resp = &data->res; | |
788e7a89 | 1053 | int status; |
1da177e4 | 1054 | |
a3f565b1 | 1055 | dprintk("NFS: %5u nfs_writeback_done (status %d)\n", |
1da177e4 LT |
1056 | task->tk_pid, task->tk_status); |
1057 | ||
f551e44f CL |
1058 | /* |
1059 | * ->write_done will attempt to use post-op attributes to detect | |
1060 | * conflicting writes by other clients. A strict interpretation | |
1061 | * of close-to-open would allow us to continue caching even if | |
1062 | * another writer had changed the file, but some applications | |
1063 | * depend on tighter cache coherency when writing. | |
1064 | */ | |
788e7a89 TM |
1065 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1066 | if (status != 0) | |
1067 | return status; | |
91d5b470 CL |
1068 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1069 | ||
1da177e4 LT |
1070 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1071 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1072 | /* We tried a write call, but the server did not | |
1073 | * commit data to stable storage even though we | |
1074 | * requested it. | |
1075 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1076 | * the server reports NFS_DATA_SYNC, but performs | |
1077 | * NFS_FILE_SYNC. We therefore implement this checking | |
1078 | * as a dprintk() in order to avoid filling syslog. | |
1079 | */ | |
1080 | static unsigned long complain; | |
1081 | ||
1082 | if (time_before(complain, jiffies)) { | |
1083 | dprintk("NFS: faulty NFS server %s:" | |
1084 | " (committed = %d) != (stable = %d)\n", | |
54ceac45 | 1085 | NFS_SERVER(data->inode)->nfs_client->cl_hostname, |
1da177e4 LT |
1086 | resp->verf->committed, argp->stable); |
1087 | complain = jiffies + 300 * HZ; | |
1088 | } | |
1089 | } | |
1090 | #endif | |
1091 | /* Is this a short write? */ | |
1092 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1093 | static unsigned long complain; | |
1094 | ||
91d5b470 CL |
1095 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1096 | ||
1da177e4 LT |
1097 | /* Has the server at least made some progress? */ |
1098 | if (resp->count != 0) { | |
1099 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1100 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1101 | /* Resend from where the server left off */ | |
1102 | argp->offset += resp->count; | |
1103 | argp->pgbase += resp->count; | |
1104 | argp->count -= resp->count; | |
1105 | } else { | |
1106 | /* Resend as a stable write in order to avoid | |
1107 | * headaches in the case of a server crash. | |
1108 | */ | |
1109 | argp->stable = NFS_FILE_SYNC; | |
1110 | } | |
1111 | rpc_restart_call(task); | |
788e7a89 | 1112 | return -EAGAIN; |
1da177e4 LT |
1113 | } |
1114 | if (time_before(complain, jiffies)) { | |
1115 | printk(KERN_WARNING | |
1116 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1117 | argp->count); | |
1118 | complain = jiffies + 300 * HZ; | |
1119 | } | |
1120 | /* Can't do anything about it except throw an error. */ | |
1121 | task->tk_status = -EIO; | |
1122 | } | |
788e7a89 | 1123 | return 0; |
1da177e4 LT |
1124 | } |
1125 | ||
1126 | ||
1127 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
963d8fe5 | 1128 | void nfs_commit_release(void *wdata) |
1da177e4 | 1129 | { |
1da177e4 LT |
1130 | nfs_commit_free(wdata); |
1131 | } | |
1132 | ||
1133 | /* | |
1134 | * Set up the argument/result storage required for the RPC call. | |
1135 | */ | |
1136 | static void nfs_commit_rpcsetup(struct list_head *head, | |
788e7a89 TM |
1137 | struct nfs_write_data *data, |
1138 | int how) | |
1da177e4 | 1139 | { |
3da28eb1 | 1140 | struct nfs_page *first; |
1da177e4 | 1141 | struct inode *inode; |
788e7a89 | 1142 | int flags; |
1da177e4 LT |
1143 | |
1144 | /* Set up the RPC argument and reply structs | |
1145 | * NB: take care not to mess about with data->commit et al. */ | |
1146 | ||
1147 | list_splice_init(head, &data->pages); | |
1148 | first = nfs_list_entry(data->pages.next); | |
88be9f99 | 1149 | inode = first->wb_context->path.dentry->d_inode; |
1da177e4 | 1150 | |
1da177e4 LT |
1151 | data->inode = inode; |
1152 | data->cred = first->wb_context->cred; | |
1153 | ||
1154 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1155 | /* Note: we always request a commit of the entire inode */ |
1156 | data->args.offset = 0; | |
1157 | data->args.count = 0; | |
1158 | data->res.count = 0; | |
1da177e4 LT |
1159 | data->res.fattr = &data->fattr; |
1160 | data->res.verf = &data->verf; | |
0e574af1 | 1161 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1162 | |
1163 | /* Set up the initial task struct. */ | |
1164 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
1165 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data); | |
1da177e4 LT |
1166 | NFS_PROTO(inode)->commit_setup(data, how); |
1167 | ||
1168 | data->task.tk_priority = flush_task_priority(how); | |
1169 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 1170 | |
a3f565b1 | 1171 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); |
1da177e4 LT |
1172 | } |
1173 | ||
1174 | /* | |
1175 | * Commit dirty pages | |
1176 | */ | |
1177 | static int | |
40859d7e | 1178 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1179 | { |
1180 | struct nfs_write_data *data; | |
1181 | struct nfs_page *req; | |
1182 | ||
e9f7bee1 | 1183 | data = nfs_commit_alloc(); |
1da177e4 LT |
1184 | |
1185 | if (!data) | |
1186 | goto out_bad; | |
1187 | ||
1188 | /* Set up the argument struct */ | |
1189 | nfs_commit_rpcsetup(head, data, how); | |
1190 | ||
1191 | nfs_execute_write(data); | |
1192 | return 0; | |
1193 | out_bad: | |
1194 | while (!list_empty(head)) { | |
1195 | req = nfs_list_entry(head->next); | |
1196 | nfs_list_remove_request(req); | |
1197 | nfs_mark_request_commit(req); | |
83715ad5 | 1198 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 PZ |
1199 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
1200 | BDI_RECLAIMABLE); | |
9fd367f0 | 1201 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
1202 | } |
1203 | return -ENOMEM; | |
1204 | } | |
1205 | ||
1206 | /* | |
1207 | * COMMIT call returned | |
1208 | */ | |
788e7a89 | 1209 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1210 | { |
963d8fe5 | 1211 | struct nfs_write_data *data = calldata; |
1da177e4 | 1212 | struct nfs_page *req; |
1da177e4 | 1213 | |
a3f565b1 | 1214 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
1da177e4 LT |
1215 | task->tk_pid, task->tk_status); |
1216 | ||
788e7a89 TM |
1217 | /* Call the NFS version-specific code */ |
1218 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1219 | return; | |
1220 | ||
1da177e4 LT |
1221 | while (!list_empty(&data->pages)) { |
1222 | req = nfs_list_entry(data->pages.next); | |
1223 | nfs_list_remove_request(req); | |
612c9384 | 1224 | clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
fd39fc85 | 1225 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 PZ |
1226 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
1227 | BDI_RECLAIMABLE); | |
1da177e4 LT |
1228 | |
1229 | dprintk("NFS: commit (%s/%Ld %d@%Ld)", | |
88be9f99 TM |
1230 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1231 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1232 | req->wb_bytes, |
1233 | (long long)req_offset(req)); | |
1234 | if (task->tk_status < 0) { | |
7b159fc1 | 1235 | nfs_context_set_write_error(req->wb_context, task->tk_status); |
1da177e4 LT |
1236 | nfs_inode_remove_request(req); |
1237 | dprintk(", error = %d\n", task->tk_status); | |
1238 | goto next; | |
1239 | } | |
1240 | ||
1241 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1242 | * returned by the server against all stored verfs. */ | |
1243 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1244 | /* We have a match */ | |
44dd151d TM |
1245 | /* Set the PG_uptodate flag */ |
1246 | nfs_mark_uptodate(req->wb_page, req->wb_pgbase, | |
1247 | req->wb_bytes); | |
1da177e4 LT |
1248 | nfs_inode_remove_request(req); |
1249 | dprintk(" OK\n"); | |
1250 | goto next; | |
1251 | } | |
1252 | /* We have a mismatch. Write the page again */ | |
1253 | dprintk(" mismatch\n"); | |
61822ab5 | 1254 | nfs_redirty_request(req); |
1da177e4 | 1255 | next: |
9fd367f0 | 1256 | nfs_clear_page_tag_locked(req); |
1da177e4 | 1257 | } |
1da177e4 | 1258 | } |
788e7a89 TM |
1259 | |
1260 | static const struct rpc_call_ops nfs_commit_ops = { | |
1261 | .rpc_call_done = nfs_commit_done, | |
1262 | .rpc_release = nfs_commit_release, | |
1263 | }; | |
1da177e4 | 1264 | |
3da28eb1 | 1265 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 | 1266 | { |
1da177e4 | 1267 | LIST_HEAD(head); |
7d46a49f | 1268 | int res; |
1da177e4 | 1269 | |
587142f8 | 1270 | spin_lock(&inode->i_lock); |
3da28eb1 | 1271 | res = nfs_scan_commit(inode, &head, 0, 0); |
587142f8 | 1272 | spin_unlock(&inode->i_lock); |
1da177e4 | 1273 | if (res) { |
7d46a49f | 1274 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1275 | if (error < 0) |
1276 | return error; | |
1277 | } | |
1da177e4 LT |
1278 | return res; |
1279 | } | |
c63c7b05 TM |
1280 | #else |
1281 | static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) | |
1282 | { | |
1283 | return 0; | |
1284 | } | |
1da177e4 LT |
1285 | #endif |
1286 | ||
1c75950b | 1287 | long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1288 | { |
1c75950b | 1289 | struct inode *inode = mapping->host; |
ca52fec1 | 1290 | pgoff_t idx_start, idx_end; |
1c75950b | 1291 | unsigned int npages = 0; |
c42de9dd | 1292 | LIST_HEAD(head); |
70b9ecbd | 1293 | int nocommit = how & FLUSH_NOCOMMIT; |
3f442547 | 1294 | long pages, ret; |
1da177e4 | 1295 | |
1c75950b TM |
1296 | /* FIXME */ |
1297 | if (wbc->range_cyclic) | |
1298 | idx_start = 0; | |
1299 | else { | |
1300 | idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1301 | idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1302 | if (idx_end > idx_start) { | |
ca52fec1 | 1303 | pgoff_t l_npages = 1 + idx_end - idx_start; |
1c75950b TM |
1304 | npages = l_npages; |
1305 | if (sizeof(npages) != sizeof(l_npages) && | |
ca52fec1 | 1306 | (pgoff_t)npages != l_npages) |
1c75950b TM |
1307 | npages = 0; |
1308 | } | |
1309 | } | |
c42de9dd | 1310 | how &= ~FLUSH_NOCOMMIT; |
587142f8 | 1311 | spin_lock(&inode->i_lock); |
1da177e4 | 1312 | do { |
c42de9dd TM |
1313 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); |
1314 | if (ret != 0) | |
70b9ecbd | 1315 | continue; |
c42de9dd TM |
1316 | if (nocommit) |
1317 | break; | |
d2ccddf0 | 1318 | pages = nfs_scan_commit(inode, &head, idx_start, npages); |
724c439c | 1319 | if (pages == 0) |
c42de9dd | 1320 | break; |
d2ccddf0 | 1321 | if (how & FLUSH_INVALIDATE) { |
587142f8 | 1322 | spin_unlock(&inode->i_lock); |
83715ad5 | 1323 | nfs_cancel_commit_list(&head); |
e8e058e8 | 1324 | ret = pages; |
587142f8 | 1325 | spin_lock(&inode->i_lock); |
d2ccddf0 TM |
1326 | continue; |
1327 | } | |
1328 | pages += nfs_scan_commit(inode, &head, 0, 0); | |
587142f8 | 1329 | spin_unlock(&inode->i_lock); |
c42de9dd | 1330 | ret = nfs_commit_list(inode, &head, how); |
587142f8 TM |
1331 | spin_lock(&inode->i_lock); |
1332 | ||
c42de9dd | 1333 | } while (ret >= 0); |
587142f8 | 1334 | spin_unlock(&inode->i_lock); |
c42de9dd | 1335 | return ret; |
1da177e4 LT |
1336 | } |
1337 | ||
34901f70 | 1338 | static int __nfs_write_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) |
1c75950b | 1339 | { |
1c75950b TM |
1340 | int ret; |
1341 | ||
34901f70 | 1342 | ret = nfs_writepages(mapping, wbc); |
61822ab5 TM |
1343 | if (ret < 0) |
1344 | goto out; | |
34901f70 | 1345 | ret = nfs_sync_mapping_wait(mapping, wbc, how); |
ed90ef51 TM |
1346 | if (ret < 0) |
1347 | goto out; | |
1348 | return 0; | |
61822ab5 | 1349 | out: |
e507d9eb | 1350 | __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); |
1c75950b TM |
1351 | return ret; |
1352 | } | |
1353 | ||
34901f70 TM |
1354 | /* Two pass sync: first using WB_SYNC_NONE, then WB_SYNC_ALL */ |
1355 | static int nfs_write_mapping(struct address_space *mapping, int how) | |
1356 | { | |
1357 | struct writeback_control wbc = { | |
1358 | .bdi = mapping->backing_dev_info, | |
1359 | .sync_mode = WB_SYNC_NONE, | |
1360 | .nr_to_write = LONG_MAX, | |
1361 | .for_writepages = 1, | |
1362 | .range_cyclic = 1, | |
1363 | }; | |
1364 | int ret; | |
1365 | ||
1366 | ret = __nfs_write_mapping(mapping, &wbc, how); | |
1367 | if (ret < 0) | |
1368 | return ret; | |
1369 | wbc.sync_mode = WB_SYNC_ALL; | |
1370 | return __nfs_write_mapping(mapping, &wbc, how); | |
1371 | } | |
1372 | ||
ed90ef51 TM |
1373 | /* |
1374 | * flush the inode to disk. | |
1375 | */ | |
1376 | int nfs_wb_all(struct inode *inode) | |
1c75950b | 1377 | { |
ed90ef51 TM |
1378 | return nfs_write_mapping(inode->i_mapping, 0); |
1379 | } | |
1c75950b | 1380 | |
ed90ef51 TM |
1381 | int nfs_wb_nocommit(struct inode *inode) |
1382 | { | |
1383 | return nfs_write_mapping(inode->i_mapping, FLUSH_NOCOMMIT); | |
1c75950b TM |
1384 | } |
1385 | ||
1b3b4a1a TM |
1386 | int nfs_wb_page_cancel(struct inode *inode, struct page *page) |
1387 | { | |
1388 | struct nfs_page *req; | |
1389 | loff_t range_start = page_offset(page); | |
1390 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
1391 | struct writeback_control wbc = { | |
1392 | .bdi = page->mapping->backing_dev_info, | |
1393 | .sync_mode = WB_SYNC_ALL, | |
1394 | .nr_to_write = LONG_MAX, | |
1395 | .range_start = range_start, | |
1396 | .range_end = range_end, | |
1397 | }; | |
1398 | int ret = 0; | |
1399 | ||
1400 | BUG_ON(!PageLocked(page)); | |
1401 | for (;;) { | |
1402 | req = nfs_page_find_request(page); | |
1403 | if (req == NULL) | |
1404 | goto out; | |
1405 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
1406 | nfs_release_request(req); | |
1407 | break; | |
1408 | } | |
1409 | if (nfs_lock_request_dontget(req)) { | |
1410 | nfs_inode_remove_request(req); | |
1411 | /* | |
1412 | * In case nfs_inode_remove_request has marked the | |
1413 | * page as being dirty | |
1414 | */ | |
1415 | cancel_dirty_page(page, PAGE_CACHE_SIZE); | |
1416 | nfs_unlock_request(req); | |
1417 | break; | |
1418 | } | |
1419 | ret = nfs_wait_on_request(req); | |
1420 | if (ret < 0) | |
1421 | goto out; | |
1422 | } | |
1423 | if (!PagePrivate(page)) | |
1424 | return 0; | |
1425 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, FLUSH_INVALIDATE); | |
1426 | out: | |
1427 | return ret; | |
1428 | } | |
1429 | ||
61822ab5 | 1430 | int nfs_wb_page_priority(struct inode *inode, struct page *page, int how) |
1c75950b TM |
1431 | { |
1432 | loff_t range_start = page_offset(page); | |
1433 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
4d770ccf TM |
1434 | struct writeback_control wbc = { |
1435 | .bdi = page->mapping->backing_dev_info, | |
1436 | .sync_mode = WB_SYNC_ALL, | |
1437 | .nr_to_write = LONG_MAX, | |
1438 | .range_start = range_start, | |
1439 | .range_end = range_end, | |
1440 | }; | |
1441 | int ret; | |
1c75950b | 1442 | |
4d770ccf | 1443 | BUG_ON(!PageLocked(page)); |
c63c7b05 | 1444 | if (clear_page_dirty_for_io(page)) { |
4d770ccf TM |
1445 | ret = nfs_writepage_locked(page, &wbc); |
1446 | if (ret < 0) | |
1447 | goto out; | |
1448 | } | |
f40313ac TM |
1449 | if (!PagePrivate(page)) |
1450 | return 0; | |
4d770ccf TM |
1451 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); |
1452 | if (ret >= 0) | |
1453 | return 0; | |
1454 | out: | |
e507d9eb | 1455 | __mark_inode_dirty(inode, I_DIRTY_PAGES); |
4d770ccf | 1456 | return ret; |
1c75950b TM |
1457 | } |
1458 | ||
1459 | /* | |
1460 | * Write back all requests on one page - we do this before reading it. | |
1461 | */ | |
1462 | int nfs_wb_page(struct inode *inode, struct page* page) | |
1463 | { | |
4d770ccf | 1464 | return nfs_wb_page_priority(inode, page, FLUSH_STABLE); |
1c75950b TM |
1465 | } |
1466 | ||
f7b422b1 | 1467 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1468 | { |
1469 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1470 | sizeof(struct nfs_write_data), | |
1471 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1472 | NULL); |
1da177e4 LT |
1473 | if (nfs_wdata_cachep == NULL) |
1474 | return -ENOMEM; | |
1475 | ||
93d2341c MD |
1476 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1477 | nfs_wdata_cachep); | |
1da177e4 LT |
1478 | if (nfs_wdata_mempool == NULL) |
1479 | return -ENOMEM; | |
1480 | ||
93d2341c MD |
1481 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1482 | nfs_wdata_cachep); | |
1da177e4 LT |
1483 | if (nfs_commit_mempool == NULL) |
1484 | return -ENOMEM; | |
1485 | ||
89a09141 PZ |
1486 | /* |
1487 | * NFS congestion size, scale with available memory. | |
1488 | * | |
1489 | * 64MB: 8192k | |
1490 | * 128MB: 11585k | |
1491 | * 256MB: 16384k | |
1492 | * 512MB: 23170k | |
1493 | * 1GB: 32768k | |
1494 | * 2GB: 46340k | |
1495 | * 4GB: 65536k | |
1496 | * 8GB: 92681k | |
1497 | * 16GB: 131072k | |
1498 | * | |
1499 | * This allows larger machines to have larger/more transfers. | |
1500 | * Limit the default to 256M | |
1501 | */ | |
1502 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); | |
1503 | if (nfs_congestion_kb > 256*1024) | |
1504 | nfs_congestion_kb = 256*1024; | |
1505 | ||
1da177e4 LT |
1506 | return 0; |
1507 | } | |
1508 | ||
266bee88 | 1509 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1510 | { |
1511 | mempool_destroy(nfs_commit_mempool); | |
1512 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1513 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1514 | } |
1515 |