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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); | |
277866a0 | 245 | if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) { |
89a09141 PZ |
246 | clear_bdi_congested(&nfss->backing_dev_info, WRITE); |
247 | congestion_end(WRITE); | |
248 | } | |
249 | } | |
250 | ||
e261f51f TM |
251 | /* |
252 | * Find an associated nfs write request, and prepare to flush it out | |
9cccef95 | 253 | * May return an error if the user signalled nfs_wait_on_request(). |
e261f51f | 254 | */ |
c63c7b05 TM |
255 | static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, |
256 | struct page *page) | |
e261f51f | 257 | { |
587142f8 TM |
258 | struct inode *inode = page->mapping->host; |
259 | struct nfs_inode *nfsi = NFS_I(inode); | |
e261f51f | 260 | struct nfs_page *req; |
e261f51f TM |
261 | int ret; |
262 | ||
587142f8 | 263 | spin_lock(&inode->i_lock); |
e261f51f TM |
264 | for(;;) { |
265 | req = nfs_page_find_request_locked(page); | |
266 | if (req == NULL) { | |
587142f8 | 267 | spin_unlock(&inode->i_lock); |
9cccef95 | 268 | return 0; |
e261f51f TM |
269 | } |
270 | if (nfs_lock_request_dontget(req)) | |
271 | break; | |
272 | /* Note: If we hold the page lock, as is the case in nfs_writepage, | |
273 | * then the call to nfs_lock_request_dontget() will always | |
274 | * succeed provided that someone hasn't already marked the | |
275 | * request as dirty (in which case we don't care). | |
276 | */ | |
587142f8 | 277 | spin_unlock(&inode->i_lock); |
e261f51f TM |
278 | ret = nfs_wait_on_request(req); |
279 | nfs_release_request(req); | |
280 | if (ret != 0) | |
281 | return ret; | |
587142f8 | 282 | spin_lock(&inode->i_lock); |
e261f51f | 283 | } |
612c9384 TM |
284 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
285 | /* This request is marked for commit */ | |
587142f8 | 286 | spin_unlock(&inode->i_lock); |
612c9384 | 287 | nfs_unlock_request(req); |
c63c7b05 | 288 | nfs_pageio_complete(pgio); |
9cccef95 | 289 | return 0; |
612c9384 | 290 | } |
c63c7b05 | 291 | if (nfs_set_page_writeback(page) != 0) { |
587142f8 | 292 | spin_unlock(&inode->i_lock); |
c63c7b05 TM |
293 | BUG(); |
294 | } | |
295 | radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, | |
9fd367f0 | 296 | NFS_PAGE_TAG_LOCKED); |
587142f8 | 297 | spin_unlock(&inode->i_lock); |
c63c7b05 | 298 | nfs_pageio_add_request(pgio, req); |
9cccef95 | 299 | return 0; |
e261f51f TM |
300 | } |
301 | ||
f758c885 | 302 | static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) |
1da177e4 | 303 | { |
1da177e4 | 304 | struct inode *inode = page->mapping->host; |
1da177e4 | 305 | |
91d5b470 CL |
306 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
307 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
308 | ||
7fe7f848 | 309 | nfs_pageio_cond_complete(pgio, page->index); |
f758c885 TM |
310 | return nfs_page_async_flush(pgio, page); |
311 | } | |
7fe7f848 | 312 | |
f758c885 TM |
313 | /* |
314 | * Write an mmapped page to the server. | |
315 | */ | |
316 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
317 | { | |
318 | struct nfs_pageio_descriptor pgio; | |
319 | int err; | |
49a70f27 | 320 | |
f758c885 TM |
321 | nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc)); |
322 | err = nfs_do_writepage(page, wbc, &pgio); | |
323 | nfs_pageio_complete(&pgio); | |
324 | if (err < 0) | |
325 | return err; | |
326 | if (pgio.pg_error < 0) | |
327 | return pgio.pg_error; | |
328 | return 0; | |
4d770ccf TM |
329 | } |
330 | ||
331 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
332 | { | |
f758c885 | 333 | int ret; |
4d770ccf | 334 | |
f758c885 | 335 | ret = nfs_writepage_locked(page, wbc); |
1da177e4 | 336 | unlock_page(page); |
f758c885 TM |
337 | return ret; |
338 | } | |
339 | ||
340 | static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) | |
341 | { | |
342 | int ret; | |
343 | ||
344 | ret = nfs_do_writepage(page, wbc, data); | |
345 | unlock_page(page); | |
346 | return ret; | |
1da177e4 LT |
347 | } |
348 | ||
1da177e4 LT |
349 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) |
350 | { | |
1da177e4 | 351 | struct inode *inode = mapping->host; |
c63c7b05 | 352 | struct nfs_pageio_descriptor pgio; |
1da177e4 LT |
353 | int err; |
354 | ||
91d5b470 CL |
355 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
356 | ||
c63c7b05 | 357 | nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); |
f758c885 | 358 | err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); |
c63c7b05 | 359 | nfs_pageio_complete(&pgio); |
f758c885 | 360 | if (err < 0) |
1da177e4 | 361 | return err; |
f758c885 | 362 | if (pgio.pg_error < 0) |
c63c7b05 TM |
363 | return pgio.pg_error; |
364 | return 0; | |
1da177e4 LT |
365 | } |
366 | ||
367 | /* | |
368 | * Insert a write request into an inode | |
369 | */ | |
370 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) | |
371 | { | |
372 | struct nfs_inode *nfsi = NFS_I(inode); | |
373 | int error; | |
374 | ||
375 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); | |
376 | BUG_ON(error == -EEXIST); | |
377 | if (error) | |
378 | return error; | |
379 | if (!nfsi->npages) { | |
380 | igrab(inode); | |
381 | nfs_begin_data_update(inode); | |
382 | if (nfs_have_delegation(inode, FMODE_WRITE)) | |
383 | nfsi->change_attr++; | |
384 | } | |
deb7d638 | 385 | SetPagePrivate(req->wb_page); |
277459d2 | 386 | set_page_private(req->wb_page, (unsigned long)req); |
1da177e4 | 387 | nfsi->npages++; |
c03b4024 | 388 | kref_get(&req->wb_kref); |
1da177e4 LT |
389 | return 0; |
390 | } | |
391 | ||
392 | /* | |
89a09141 | 393 | * Remove a write request from an inode |
1da177e4 LT |
394 | */ |
395 | static void nfs_inode_remove_request(struct nfs_page *req) | |
396 | { | |
88be9f99 | 397 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
398 | struct nfs_inode *nfsi = NFS_I(inode); |
399 | ||
400 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
401 | ||
587142f8 | 402 | spin_lock(&inode->i_lock); |
277459d2 | 403 | set_page_private(req->wb_page, 0); |
deb7d638 | 404 | ClearPagePrivate(req->wb_page); |
1da177e4 LT |
405 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
406 | nfsi->npages--; | |
407 | if (!nfsi->npages) { | |
587142f8 | 408 | spin_unlock(&inode->i_lock); |
951a143b | 409 | nfs_end_data_update(inode); |
1da177e4 LT |
410 | iput(inode); |
411 | } else | |
587142f8 | 412 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
413 | nfs_clear_request(req); |
414 | nfs_release_request(req); | |
415 | } | |
416 | ||
61822ab5 TM |
417 | static void |
418 | nfs_redirty_request(struct nfs_page *req) | |
419 | { | |
61822ab5 TM |
420 | __set_page_dirty_nobuffers(req->wb_page); |
421 | } | |
422 | ||
1da177e4 LT |
423 | /* |
424 | * Check if a request is dirty | |
425 | */ | |
426 | static inline int | |
427 | nfs_dirty_request(struct nfs_page *req) | |
428 | { | |
5a6d41b3 TM |
429 | struct page *page = req->wb_page; |
430 | ||
612c9384 | 431 | if (page == NULL || test_bit(PG_NEED_COMMIT, &req->wb_flags)) |
5a6d41b3 TM |
432 | return 0; |
433 | return !PageWriteback(req->wb_page); | |
1da177e4 LT |
434 | } |
435 | ||
436 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
437 | /* | |
438 | * Add a request to the inode's commit list. | |
439 | */ | |
440 | static void | |
441 | nfs_mark_request_commit(struct nfs_page *req) | |
442 | { | |
88be9f99 | 443 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
444 | struct nfs_inode *nfsi = NFS_I(inode); |
445 | ||
587142f8 | 446 | spin_lock(&inode->i_lock); |
1da177e4 | 447 | nfsi->ncommit++; |
612c9384 | 448 | set_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
5c369683 TM |
449 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
450 | req->wb_index, | |
451 | NFS_PAGE_TAG_COMMIT); | |
587142f8 | 452 | spin_unlock(&inode->i_lock); |
fd39fc85 | 453 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
a1803044 | 454 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1da177e4 | 455 | } |
8e821cad TM |
456 | |
457 | static inline | |
458 | int nfs_write_need_commit(struct nfs_write_data *data) | |
459 | { | |
460 | return data->verf.committed != NFS_FILE_SYNC; | |
461 | } | |
462 | ||
463 | static inline | |
464 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
465 | { | |
612c9384 | 466 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
8e821cad TM |
467 | nfs_mark_request_commit(req); |
468 | return 1; | |
469 | } | |
470 | if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { | |
471 | nfs_redirty_request(req); | |
472 | return 1; | |
473 | } | |
474 | return 0; | |
475 | } | |
476 | #else | |
477 | static inline void | |
478 | nfs_mark_request_commit(struct nfs_page *req) | |
479 | { | |
480 | } | |
481 | ||
482 | static inline | |
483 | int nfs_write_need_commit(struct nfs_write_data *data) | |
484 | { | |
485 | return 0; | |
486 | } | |
487 | ||
488 | static inline | |
489 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
490 | { | |
491 | return 0; | |
492 | } | |
1da177e4 LT |
493 | #endif |
494 | ||
495 | /* | |
496 | * Wait for a request to complete. | |
497 | * | |
498 | * Interruptible by signals only if mounted with intr flag. | |
499 | */ | |
ca52fec1 | 500 | static int nfs_wait_on_requests_locked(struct inode *inode, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
501 | { |
502 | struct nfs_inode *nfsi = NFS_I(inode); | |
503 | struct nfs_page *req; | |
ca52fec1 | 504 | pgoff_t idx_end, next; |
1da177e4 LT |
505 | unsigned int res = 0; |
506 | int error; | |
507 | ||
508 | if (npages == 0) | |
509 | idx_end = ~0; | |
510 | else | |
511 | idx_end = idx_start + npages - 1; | |
512 | ||
1da177e4 | 513 | next = idx_start; |
9fd367f0 | 514 | while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_LOCKED)) { |
1da177e4 LT |
515 | if (req->wb_index > idx_end) |
516 | break; | |
517 | ||
518 | next = req->wb_index + 1; | |
c6a556b8 | 519 | BUG_ON(!NFS_WBACK_BUSY(req)); |
1da177e4 | 520 | |
c03b4024 | 521 | kref_get(&req->wb_kref); |
587142f8 | 522 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
523 | error = nfs_wait_on_request(req); |
524 | nfs_release_request(req); | |
587142f8 | 525 | spin_lock(&inode->i_lock); |
1da177e4 LT |
526 | if (error < 0) |
527 | return error; | |
1da177e4 LT |
528 | res++; |
529 | } | |
1da177e4 LT |
530 | return res; |
531 | } | |
532 | ||
83715ad5 TM |
533 | static void nfs_cancel_commit_list(struct list_head *head) |
534 | { | |
535 | struct nfs_page *req; | |
536 | ||
537 | while(!list_empty(head)) { | |
538 | req = nfs_list_entry(head->next); | |
b6dff26a | 539 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
83715ad5 | 540 | nfs_list_remove_request(req); |
612c9384 | 541 | clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
83715ad5 | 542 | nfs_inode_remove_request(req); |
b6dff26a | 543 | nfs_unlock_request(req); |
83715ad5 TM |
544 | } |
545 | } | |
546 | ||
1da177e4 LT |
547 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
548 | /* | |
549 | * nfs_scan_commit - Scan an inode for commit requests | |
550 | * @inode: NFS inode to scan | |
551 | * @dst: destination list | |
552 | * @idx_start: lower bound of page->index to scan. | |
553 | * @npages: idx_start + npages sets the upper bound to scan. | |
554 | * | |
555 | * Moves requests from the inode's 'commit' request list. | |
556 | * The requests are *not* checked to ensure that they form a contiguous set. | |
557 | */ | |
558 | static int | |
ca52fec1 | 559 | nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
560 | { |
561 | struct nfs_inode *nfsi = NFS_I(inode); | |
3da28eb1 TM |
562 | int res = 0; |
563 | ||
564 | if (nfsi->ncommit != 0) { | |
5c369683 TM |
565 | res = nfs_scan_list(nfsi, dst, idx_start, npages, |
566 | NFS_PAGE_TAG_COMMIT); | |
3da28eb1 | 567 | nfsi->ncommit -= res; |
3da28eb1 | 568 | } |
1da177e4 LT |
569 | return res; |
570 | } | |
c42de9dd | 571 | #else |
ca52fec1 | 572 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
c42de9dd TM |
573 | { |
574 | return 0; | |
575 | } | |
1da177e4 LT |
576 | #endif |
577 | ||
1da177e4 LT |
578 | /* |
579 | * Try to update any existing write request, or create one if there is none. | |
580 | * In order to match, the request's credentials must match those of | |
581 | * the calling process. | |
582 | * | |
583 | * Note: Should always be called with the Page Lock held! | |
584 | */ | |
585 | static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, | |
e21195a7 | 586 | struct page *page, unsigned int offset, unsigned int bytes) |
1da177e4 | 587 | { |
89a09141 PZ |
588 | struct address_space *mapping = page->mapping; |
589 | struct inode *inode = mapping->host; | |
1da177e4 | 590 | struct nfs_page *req, *new = NULL; |
ca52fec1 | 591 | pgoff_t rqend, end; |
1da177e4 LT |
592 | |
593 | end = offset + bytes; | |
594 | ||
1da177e4 LT |
595 | for (;;) { |
596 | /* Loop over all inode entries and see if we find | |
597 | * A request for the page we wish to update | |
598 | */ | |
587142f8 | 599 | spin_lock(&inode->i_lock); |
277459d2 | 600 | req = nfs_page_find_request_locked(page); |
1da177e4 LT |
601 | if (req) { |
602 | if (!nfs_lock_request_dontget(req)) { | |
603 | int error; | |
277459d2 | 604 | |
587142f8 | 605 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
606 | error = nfs_wait_on_request(req); |
607 | nfs_release_request(req); | |
1dd594b2 NB |
608 | if (error < 0) { |
609 | if (new) | |
610 | nfs_release_request(new); | |
1da177e4 | 611 | return ERR_PTR(error); |
1dd594b2 | 612 | } |
1da177e4 LT |
613 | continue; |
614 | } | |
587142f8 | 615 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
616 | if (new) |
617 | nfs_release_request(new); | |
618 | break; | |
619 | } | |
620 | ||
621 | if (new) { | |
622 | int error; | |
623 | nfs_lock_request_dontget(new); | |
624 | error = nfs_inode_add_request(inode, new); | |
625 | if (error) { | |
587142f8 | 626 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
627 | nfs_unlock_request(new); |
628 | return ERR_PTR(error); | |
629 | } | |
587142f8 | 630 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
631 | return new; |
632 | } | |
587142f8 | 633 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
634 | |
635 | new = nfs_create_request(ctx, inode, page, offset, bytes); | |
636 | if (IS_ERR(new)) | |
637 | return new; | |
638 | } | |
639 | ||
640 | /* We have a request for our page. | |
641 | * If the creds don't match, or the | |
642 | * page addresses don't match, | |
643 | * tell the caller to wait on the conflicting | |
644 | * request. | |
645 | */ | |
646 | rqend = req->wb_offset + req->wb_bytes; | |
647 | if (req->wb_context != ctx | |
648 | || req->wb_page != page | |
649 | || !nfs_dirty_request(req) | |
650 | || offset > rqend || end < req->wb_offset) { | |
651 | nfs_unlock_request(req); | |
652 | return ERR_PTR(-EBUSY); | |
653 | } | |
654 | ||
655 | /* Okay, the request matches. Update the region */ | |
656 | if (offset < req->wb_offset) { | |
657 | req->wb_offset = offset; | |
658 | req->wb_pgbase = offset; | |
659 | req->wb_bytes = rqend - req->wb_offset; | |
660 | } | |
661 | ||
662 | if (end > rqend) | |
663 | req->wb_bytes = end - req->wb_offset; | |
664 | ||
665 | return req; | |
666 | } | |
667 | ||
668 | int nfs_flush_incompatible(struct file *file, struct page *page) | |
669 | { | |
670 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 | 671 | struct nfs_page *req; |
1a54533e | 672 | int do_flush, status; |
1da177e4 LT |
673 | /* |
674 | * Look for a request corresponding to this page. If there | |
675 | * is one, and it belongs to another file, we flush it out | |
676 | * before we try to copy anything into the page. Do this | |
677 | * due to the lack of an ACCESS-type call in NFSv2. | |
678 | * Also do the same if we find a request from an existing | |
679 | * dropped page. | |
680 | */ | |
1a54533e TM |
681 | do { |
682 | req = nfs_page_find_request(page); | |
683 | if (req == NULL) | |
684 | return 0; | |
685 | do_flush = req->wb_page != page || req->wb_context != ctx | |
e261f51f | 686 | || !nfs_dirty_request(req); |
1da177e4 | 687 | nfs_release_request(req); |
1a54533e TM |
688 | if (!do_flush) |
689 | return 0; | |
690 | status = nfs_wb_page(page->mapping->host, page); | |
691 | } while (status == 0); | |
692 | return status; | |
1da177e4 LT |
693 | } |
694 | ||
695 | /* | |
696 | * Update and possibly write a cached page of an NFS file. | |
697 | * | |
698 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
699 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
700 | */ | |
701 | int nfs_updatepage(struct file *file, struct page *page, | |
702 | unsigned int offset, unsigned int count) | |
703 | { | |
704 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 | 705 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
706 | int status = 0; |
707 | ||
91d5b470 CL |
708 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
709 | ||
1da177e4 | 710 | dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", |
01cce933 JJS |
711 | file->f_path.dentry->d_parent->d_name.name, |
712 | file->f_path.dentry->d_name.name, count, | |
0bbacc40 | 713 | (long long)(page_offset(page) +offset)); |
1da177e4 | 714 | |
1da177e4 LT |
715 | /* If we're not using byte range locks, and we know the page |
716 | * is entirely in cache, it may be more efficient to avoid | |
717 | * fragmenting write requests. | |
718 | */ | |
ab0a3dbe | 719 | if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) { |
49a70f27 | 720 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 721 | offset = 0; |
1da177e4 LT |
722 | } |
723 | ||
e21195a7 | 724 | status = nfs_writepage_setup(ctx, page, offset, count); |
e261f51f | 725 | __set_page_dirty_nobuffers(page); |
1da177e4 | 726 | |
1da177e4 LT |
727 | dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", |
728 | status, (long long)i_size_read(inode)); | |
729 | if (status < 0) | |
a301b777 | 730 | nfs_set_pageerror(page); |
1da177e4 LT |
731 | return status; |
732 | } | |
733 | ||
734 | static void nfs_writepage_release(struct nfs_page *req) | |
735 | { | |
1da177e4 | 736 | |
44dd151d TM |
737 | if (PageError(req->wb_page)) { |
738 | nfs_end_page_writeback(req->wb_page); | |
739 | nfs_inode_remove_request(req); | |
740 | } else if (!nfs_reschedule_unstable_write(req)) { | |
741 | /* Set the PG_uptodate flag */ | |
742 | nfs_mark_uptodate(req->wb_page, req->wb_pgbase, req->wb_bytes); | |
8e821cad TM |
743 | nfs_end_page_writeback(req->wb_page); |
744 | nfs_inode_remove_request(req); | |
745 | } else | |
746 | nfs_end_page_writeback(req->wb_page); | |
9fd367f0 | 747 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
748 | } |
749 | ||
750 | static inline int flush_task_priority(int how) | |
751 | { | |
752 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
753 | case FLUSH_HIGHPRI: | |
754 | return RPC_PRIORITY_HIGH; | |
755 | case FLUSH_LOWPRI: | |
756 | return RPC_PRIORITY_LOW; | |
757 | } | |
758 | return RPC_PRIORITY_NORMAL; | |
759 | } | |
760 | ||
761 | /* | |
762 | * Set up the argument/result storage required for the RPC call. | |
763 | */ | |
764 | static void nfs_write_rpcsetup(struct nfs_page *req, | |
765 | struct nfs_write_data *data, | |
788e7a89 | 766 | const struct rpc_call_ops *call_ops, |
1da177e4 LT |
767 | unsigned int count, unsigned int offset, |
768 | int how) | |
769 | { | |
1da177e4 | 770 | struct inode *inode; |
788e7a89 | 771 | int flags; |
1da177e4 LT |
772 | |
773 | /* Set up the RPC argument and reply structs | |
774 | * NB: take care not to mess about with data->commit et al. */ | |
775 | ||
776 | data->req = req; | |
88be9f99 | 777 | data->inode = inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
778 | data->cred = req->wb_context->cred; |
779 | ||
780 | data->args.fh = NFS_FH(inode); | |
781 | data->args.offset = req_offset(req) + offset; | |
782 | data->args.pgbase = req->wb_pgbase + offset; | |
783 | data->args.pages = data->pagevec; | |
784 | data->args.count = count; | |
785 | data->args.context = req->wb_context; | |
786 | ||
787 | data->res.fattr = &data->fattr; | |
788 | data->res.count = count; | |
789 | data->res.verf = &data->verf; | |
0e574af1 | 790 | nfs_fattr_init(&data->fattr); |
1da177e4 | 791 | |
788e7a89 TM |
792 | /* Set up the initial task struct. */ |
793 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
794 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data); | |
1da177e4 LT |
795 | NFS_PROTO(inode)->write_setup(data, how); |
796 | ||
797 | data->task.tk_priority = flush_task_priority(how); | |
798 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 799 | |
a3f565b1 CL |
800 | dprintk("NFS: %5u initiated write call " |
801 | "(req %s/%Ld, %u bytes @ offset %Lu)\n", | |
0bbacc40 | 802 | data->task.tk_pid, |
1da177e4 LT |
803 | inode->i_sb->s_id, |
804 | (long long)NFS_FILEID(inode), | |
805 | count, | |
806 | (unsigned long long)data->args.offset); | |
807 | } | |
808 | ||
809 | static void nfs_execute_write(struct nfs_write_data *data) | |
810 | { | |
811 | struct rpc_clnt *clnt = NFS_CLIENT(data->inode); | |
812 | sigset_t oldset; | |
813 | ||
814 | rpc_clnt_sigmask(clnt, &oldset); | |
1da177e4 | 815 | rpc_execute(&data->task); |
1da177e4 LT |
816 | rpc_clnt_sigunmask(clnt, &oldset); |
817 | } | |
818 | ||
819 | /* | |
820 | * Generate multiple small requests to write out a single | |
821 | * contiguous dirty area on one page. | |
822 | */ | |
8d5658c9 | 823 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
824 | { |
825 | struct nfs_page *req = nfs_list_entry(head->next); | |
826 | struct page *page = req->wb_page; | |
827 | struct nfs_write_data *data; | |
e9f7bee1 TM |
828 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
829 | unsigned int offset; | |
1da177e4 LT |
830 | int requests = 0; |
831 | LIST_HEAD(list); | |
832 | ||
833 | nfs_list_remove_request(req); | |
834 | ||
bcb71bba | 835 | nbytes = count; |
e9f7bee1 TM |
836 | do { |
837 | size_t len = min(nbytes, wsize); | |
838 | ||
8d5658c9 | 839 | data = nfs_writedata_alloc(1); |
1da177e4 LT |
840 | if (!data) |
841 | goto out_bad; | |
842 | list_add(&data->pages, &list); | |
843 | requests++; | |
e9f7bee1 TM |
844 | nbytes -= len; |
845 | } while (nbytes != 0); | |
1da177e4 LT |
846 | atomic_set(&req->wb_complete, requests); |
847 | ||
848 | ClearPageError(page); | |
1da177e4 | 849 | offset = 0; |
bcb71bba | 850 | nbytes = count; |
1da177e4 LT |
851 | do { |
852 | data = list_entry(list.next, struct nfs_write_data, pages); | |
853 | list_del_init(&data->pages); | |
854 | ||
855 | data->pagevec[0] = page; | |
1da177e4 | 856 | |
bcb71bba TM |
857 | if (nbytes < wsize) |
858 | wsize = nbytes; | |
859 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, | |
860 | wsize, offset, how); | |
861 | offset += wsize; | |
862 | nbytes -= wsize; | |
1da177e4 LT |
863 | nfs_execute_write(data); |
864 | } while (nbytes != 0); | |
865 | ||
866 | return 0; | |
867 | ||
868 | out_bad: | |
869 | while (!list_empty(&list)) { | |
870 | data = list_entry(list.next, struct nfs_write_data, pages); | |
871 | list_del(&data->pages); | |
8aca67f0 | 872 | nfs_writedata_release(data); |
1da177e4 | 873 | } |
61822ab5 | 874 | nfs_redirty_request(req); |
6d677e35 | 875 | nfs_end_page_writeback(req->wb_page); |
9fd367f0 | 876 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
877 | return -ENOMEM; |
878 | } | |
879 | ||
880 | /* | |
881 | * Create an RPC task for the given write request and kick it. | |
882 | * The page must have been locked by the caller. | |
883 | * | |
884 | * It may happen that the page we're passed is not marked dirty. | |
885 | * This is the case if nfs_updatepage detects a conflicting request | |
886 | * that has been written but not committed. | |
887 | */ | |
8d5658c9 | 888 | static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
889 | { |
890 | struct nfs_page *req; | |
891 | struct page **pages; | |
892 | struct nfs_write_data *data; | |
1da177e4 | 893 | |
8d5658c9 | 894 | data = nfs_writedata_alloc(npages); |
1da177e4 LT |
895 | if (!data) |
896 | goto out_bad; | |
897 | ||
898 | pages = data->pagevec; | |
1da177e4 LT |
899 | while (!list_empty(head)) { |
900 | req = nfs_list_entry(head->next); | |
901 | nfs_list_remove_request(req); | |
902 | nfs_list_add_request(req, &data->pages); | |
903 | ClearPageError(req->wb_page); | |
1da177e4 | 904 | *pages++ = req->wb_page; |
1da177e4 LT |
905 | } |
906 | req = nfs_list_entry(data->pages.next); | |
907 | ||
1da177e4 | 908 | /* Set up the argument struct */ |
788e7a89 | 909 | nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 LT |
910 | |
911 | nfs_execute_write(data); | |
912 | return 0; | |
913 | out_bad: | |
914 | while (!list_empty(head)) { | |
10afec90 | 915 | req = nfs_list_entry(head->next); |
1da177e4 | 916 | nfs_list_remove_request(req); |
61822ab5 | 917 | nfs_redirty_request(req); |
6d677e35 | 918 | nfs_end_page_writeback(req->wb_page); |
9fd367f0 | 919 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
920 | } |
921 | return -ENOMEM; | |
922 | } | |
923 | ||
c63c7b05 TM |
924 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, |
925 | struct inode *inode, int ioflags) | |
1da177e4 | 926 | { |
7d46a49f | 927 | int wsize = NFS_SERVER(inode)->wsize; |
1da177e4 | 928 | |
bcb71bba | 929 | if (wsize < PAGE_CACHE_SIZE) |
c63c7b05 | 930 | nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); |
bcb71bba | 931 | else |
c63c7b05 | 932 | nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); |
1da177e4 LT |
933 | } |
934 | ||
935 | /* | |
936 | * Handle a write reply that flushed part of a page. | |
937 | */ | |
788e7a89 | 938 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 939 | { |
788e7a89 | 940 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
941 | struct nfs_page *req = data->req; |
942 | struct page *page = req->wb_page; | |
943 | ||
944 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
88be9f99 TM |
945 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
946 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
947 | req->wb_bytes, |
948 | (long long)req_offset(req)); | |
949 | ||
788e7a89 TM |
950 | if (nfs_writeback_done(task, data) != 0) |
951 | return; | |
952 | ||
953 | if (task->tk_status < 0) { | |
a301b777 | 954 | nfs_set_pageerror(page); |
7b159fc1 | 955 | nfs_context_set_write_error(req->wb_context, task->tk_status); |
788e7a89 | 956 | dprintk(", error = %d\n", task->tk_status); |
8e821cad | 957 | goto out; |
1da177e4 LT |
958 | } |
959 | ||
8e821cad | 960 | if (nfs_write_need_commit(data)) { |
587142f8 | 961 | struct inode *inode = page->mapping->host; |
8e821cad | 962 | |
587142f8 | 963 | spin_lock(&inode->i_lock); |
8e821cad TM |
964 | if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { |
965 | /* Do nothing we need to resend the writes */ | |
966 | } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
967 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
968 | dprintk(" defer commit\n"); | |
969 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
970 | set_bit(PG_NEED_RESCHED, &req->wb_flags); | |
971 | clear_bit(PG_NEED_COMMIT, &req->wb_flags); | |
972 | dprintk(" server reboot detected\n"); | |
973 | } | |
587142f8 | 974 | spin_unlock(&inode->i_lock); |
8e821cad TM |
975 | } else |
976 | dprintk(" OK\n"); | |
977 | ||
978 | out: | |
1da177e4 LT |
979 | if (atomic_dec_and_test(&req->wb_complete)) |
980 | nfs_writepage_release(req); | |
981 | } | |
982 | ||
788e7a89 TM |
983 | static const struct rpc_call_ops nfs_write_partial_ops = { |
984 | .rpc_call_done = nfs_writeback_done_partial, | |
985 | .rpc_release = nfs_writedata_release, | |
986 | }; | |
987 | ||
1da177e4 LT |
988 | /* |
989 | * Handle a write reply that flushes a whole page. | |
990 | * | |
991 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
992 | * writebacks since the page->count is kept > 1 for as long | |
993 | * as the page has a write request pending. | |
994 | */ | |
788e7a89 | 995 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 996 | { |
788e7a89 | 997 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
998 | struct nfs_page *req; |
999 | struct page *page; | |
1000 | ||
788e7a89 TM |
1001 | if (nfs_writeback_done(task, data) != 0) |
1002 | return; | |
1003 | ||
1da177e4 LT |
1004 | /* Update attributes as result of writeback. */ |
1005 | while (!list_empty(&data->pages)) { | |
1006 | req = nfs_list_entry(data->pages.next); | |
1007 | nfs_list_remove_request(req); | |
1008 | page = req->wb_page; | |
1009 | ||
1010 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
88be9f99 TM |
1011 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1012 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1013 | req->wb_bytes, |
1014 | (long long)req_offset(req)); | |
1015 | ||
788e7a89 | 1016 | if (task->tk_status < 0) { |
a301b777 | 1017 | nfs_set_pageerror(page); |
7b159fc1 | 1018 | nfs_context_set_write_error(req->wb_context, task->tk_status); |
788e7a89 | 1019 | dprintk(", error = %d\n", task->tk_status); |
8e821cad | 1020 | goto remove_request; |
1da177e4 | 1021 | } |
1da177e4 | 1022 | |
8e821cad TM |
1023 | if (nfs_write_need_commit(data)) { |
1024 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1025 | nfs_mark_request_commit(req); | |
1026 | nfs_end_page_writeback(page); | |
1027 | dprintk(" marked for commit\n"); | |
1da177e4 LT |
1028 | goto next; |
1029 | } | |
44dd151d TM |
1030 | /* Set the PG_uptodate flag? */ |
1031 | nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); | |
8e821cad TM |
1032 | dprintk(" OK\n"); |
1033 | remove_request: | |
1034 | nfs_end_page_writeback(page); | |
1da177e4 | 1035 | nfs_inode_remove_request(req); |
1da177e4 | 1036 | next: |
9fd367f0 | 1037 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
1038 | } |
1039 | } | |
1040 | ||
788e7a89 TM |
1041 | static const struct rpc_call_ops nfs_write_full_ops = { |
1042 | .rpc_call_done = nfs_writeback_done_full, | |
1043 | .rpc_release = nfs_writedata_release, | |
1044 | }; | |
1045 | ||
1046 | ||
1da177e4 LT |
1047 | /* |
1048 | * This function is called when the WRITE call is complete. | |
1049 | */ | |
462d5b32 | 1050 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1051 | { |
1da177e4 LT |
1052 | struct nfs_writeargs *argp = &data->args; |
1053 | struct nfs_writeres *resp = &data->res; | |
788e7a89 | 1054 | int status; |
1da177e4 | 1055 | |
a3f565b1 | 1056 | dprintk("NFS: %5u nfs_writeback_done (status %d)\n", |
1da177e4 LT |
1057 | task->tk_pid, task->tk_status); |
1058 | ||
f551e44f CL |
1059 | /* |
1060 | * ->write_done will attempt to use post-op attributes to detect | |
1061 | * conflicting writes by other clients. A strict interpretation | |
1062 | * of close-to-open would allow us to continue caching even if | |
1063 | * another writer had changed the file, but some applications | |
1064 | * depend on tighter cache coherency when writing. | |
1065 | */ | |
788e7a89 TM |
1066 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1067 | if (status != 0) | |
1068 | return status; | |
91d5b470 CL |
1069 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1070 | ||
1da177e4 LT |
1071 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1072 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1073 | /* We tried a write call, but the server did not | |
1074 | * commit data to stable storage even though we | |
1075 | * requested it. | |
1076 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1077 | * the server reports NFS_DATA_SYNC, but performs | |
1078 | * NFS_FILE_SYNC. We therefore implement this checking | |
1079 | * as a dprintk() in order to avoid filling syslog. | |
1080 | */ | |
1081 | static unsigned long complain; | |
1082 | ||
1083 | if (time_before(complain, jiffies)) { | |
1084 | dprintk("NFS: faulty NFS server %s:" | |
1085 | " (committed = %d) != (stable = %d)\n", | |
54ceac45 | 1086 | NFS_SERVER(data->inode)->nfs_client->cl_hostname, |
1da177e4 LT |
1087 | resp->verf->committed, argp->stable); |
1088 | complain = jiffies + 300 * HZ; | |
1089 | } | |
1090 | } | |
1091 | #endif | |
1092 | /* Is this a short write? */ | |
1093 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1094 | static unsigned long complain; | |
1095 | ||
91d5b470 CL |
1096 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1097 | ||
1da177e4 LT |
1098 | /* Has the server at least made some progress? */ |
1099 | if (resp->count != 0) { | |
1100 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1101 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1102 | /* Resend from where the server left off */ | |
1103 | argp->offset += resp->count; | |
1104 | argp->pgbase += resp->count; | |
1105 | argp->count -= resp->count; | |
1106 | } else { | |
1107 | /* Resend as a stable write in order to avoid | |
1108 | * headaches in the case of a server crash. | |
1109 | */ | |
1110 | argp->stable = NFS_FILE_SYNC; | |
1111 | } | |
1112 | rpc_restart_call(task); | |
788e7a89 | 1113 | return -EAGAIN; |
1da177e4 LT |
1114 | } |
1115 | if (time_before(complain, jiffies)) { | |
1116 | printk(KERN_WARNING | |
1117 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1118 | argp->count); | |
1119 | complain = jiffies + 300 * HZ; | |
1120 | } | |
1121 | /* Can't do anything about it except throw an error. */ | |
1122 | task->tk_status = -EIO; | |
1123 | } | |
788e7a89 | 1124 | return 0; |
1da177e4 LT |
1125 | } |
1126 | ||
1127 | ||
1128 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
963d8fe5 | 1129 | void nfs_commit_release(void *wdata) |
1da177e4 | 1130 | { |
1da177e4 LT |
1131 | nfs_commit_free(wdata); |
1132 | } | |
1133 | ||
1134 | /* | |
1135 | * Set up the argument/result storage required for the RPC call. | |
1136 | */ | |
1137 | static void nfs_commit_rpcsetup(struct list_head *head, | |
788e7a89 TM |
1138 | struct nfs_write_data *data, |
1139 | int how) | |
1da177e4 | 1140 | { |
3da28eb1 | 1141 | struct nfs_page *first; |
1da177e4 | 1142 | struct inode *inode; |
788e7a89 | 1143 | int flags; |
1da177e4 LT |
1144 | |
1145 | /* Set up the RPC argument and reply structs | |
1146 | * NB: take care not to mess about with data->commit et al. */ | |
1147 | ||
1148 | list_splice_init(head, &data->pages); | |
1149 | first = nfs_list_entry(data->pages.next); | |
88be9f99 | 1150 | inode = first->wb_context->path.dentry->d_inode; |
1da177e4 | 1151 | |
1da177e4 LT |
1152 | data->inode = inode; |
1153 | data->cred = first->wb_context->cred; | |
1154 | ||
1155 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1156 | /* Note: we always request a commit of the entire inode */ |
1157 | data->args.offset = 0; | |
1158 | data->args.count = 0; | |
1159 | data->res.count = 0; | |
1da177e4 LT |
1160 | data->res.fattr = &data->fattr; |
1161 | data->res.verf = &data->verf; | |
0e574af1 | 1162 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1163 | |
1164 | /* Set up the initial task struct. */ | |
1165 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
1166 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data); | |
1da177e4 LT |
1167 | NFS_PROTO(inode)->commit_setup(data, how); |
1168 | ||
1169 | data->task.tk_priority = flush_task_priority(how); | |
1170 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 1171 | |
a3f565b1 | 1172 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); |
1da177e4 LT |
1173 | } |
1174 | ||
1175 | /* | |
1176 | * Commit dirty pages | |
1177 | */ | |
1178 | static int | |
40859d7e | 1179 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1180 | { |
1181 | struct nfs_write_data *data; | |
1182 | struct nfs_page *req; | |
1183 | ||
e9f7bee1 | 1184 | data = nfs_commit_alloc(); |
1da177e4 LT |
1185 | |
1186 | if (!data) | |
1187 | goto out_bad; | |
1188 | ||
1189 | /* Set up the argument struct */ | |
1190 | nfs_commit_rpcsetup(head, data, how); | |
1191 | ||
1192 | nfs_execute_write(data); | |
1193 | return 0; | |
1194 | out_bad: | |
1195 | while (!list_empty(head)) { | |
1196 | req = nfs_list_entry(head->next); | |
1197 | nfs_list_remove_request(req); | |
1198 | nfs_mark_request_commit(req); | |
83715ad5 | 1199 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
9fd367f0 | 1200 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
1201 | } |
1202 | return -ENOMEM; | |
1203 | } | |
1204 | ||
1205 | /* | |
1206 | * COMMIT call returned | |
1207 | */ | |
788e7a89 | 1208 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1209 | { |
963d8fe5 | 1210 | struct nfs_write_data *data = calldata; |
1da177e4 | 1211 | struct nfs_page *req; |
1da177e4 | 1212 | |
a3f565b1 | 1213 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
1da177e4 LT |
1214 | task->tk_pid, task->tk_status); |
1215 | ||
788e7a89 TM |
1216 | /* Call the NFS version-specific code */ |
1217 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1218 | return; | |
1219 | ||
1da177e4 LT |
1220 | while (!list_empty(&data->pages)) { |
1221 | req = nfs_list_entry(data->pages.next); | |
1222 | nfs_list_remove_request(req); | |
612c9384 | 1223 | clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
fd39fc85 | 1224 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
1da177e4 LT |
1225 | |
1226 | dprintk("NFS: commit (%s/%Ld %d@%Ld)", | |
88be9f99 TM |
1227 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1228 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1229 | req->wb_bytes, |
1230 | (long long)req_offset(req)); | |
1231 | if (task->tk_status < 0) { | |
7b159fc1 | 1232 | nfs_context_set_write_error(req->wb_context, task->tk_status); |
1da177e4 LT |
1233 | nfs_inode_remove_request(req); |
1234 | dprintk(", error = %d\n", task->tk_status); | |
1235 | goto next; | |
1236 | } | |
1237 | ||
1238 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1239 | * returned by the server against all stored verfs. */ | |
1240 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1241 | /* We have a match */ | |
44dd151d TM |
1242 | /* Set the PG_uptodate flag */ |
1243 | nfs_mark_uptodate(req->wb_page, req->wb_pgbase, | |
1244 | req->wb_bytes); | |
1da177e4 LT |
1245 | nfs_inode_remove_request(req); |
1246 | dprintk(" OK\n"); | |
1247 | goto next; | |
1248 | } | |
1249 | /* We have a mismatch. Write the page again */ | |
1250 | dprintk(" mismatch\n"); | |
61822ab5 | 1251 | nfs_redirty_request(req); |
1da177e4 | 1252 | next: |
9fd367f0 | 1253 | nfs_clear_page_tag_locked(req); |
1da177e4 | 1254 | } |
1da177e4 | 1255 | } |
788e7a89 TM |
1256 | |
1257 | static const struct rpc_call_ops nfs_commit_ops = { | |
1258 | .rpc_call_done = nfs_commit_done, | |
1259 | .rpc_release = nfs_commit_release, | |
1260 | }; | |
1da177e4 | 1261 | |
3da28eb1 | 1262 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 | 1263 | { |
1da177e4 | 1264 | LIST_HEAD(head); |
7d46a49f | 1265 | int res; |
1da177e4 | 1266 | |
587142f8 | 1267 | spin_lock(&inode->i_lock); |
3da28eb1 | 1268 | res = nfs_scan_commit(inode, &head, 0, 0); |
587142f8 | 1269 | spin_unlock(&inode->i_lock); |
1da177e4 | 1270 | if (res) { |
7d46a49f | 1271 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1272 | if (error < 0) |
1273 | return error; | |
1274 | } | |
1da177e4 LT |
1275 | return res; |
1276 | } | |
c63c7b05 TM |
1277 | #else |
1278 | static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) | |
1279 | { | |
1280 | return 0; | |
1281 | } | |
1da177e4 LT |
1282 | #endif |
1283 | ||
1c75950b | 1284 | long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1285 | { |
1c75950b | 1286 | struct inode *inode = mapping->host; |
ca52fec1 | 1287 | pgoff_t idx_start, idx_end; |
1c75950b | 1288 | unsigned int npages = 0; |
c42de9dd | 1289 | LIST_HEAD(head); |
70b9ecbd | 1290 | int nocommit = how & FLUSH_NOCOMMIT; |
3f442547 | 1291 | long pages, ret; |
1da177e4 | 1292 | |
1c75950b TM |
1293 | /* FIXME */ |
1294 | if (wbc->range_cyclic) | |
1295 | idx_start = 0; | |
1296 | else { | |
1297 | idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1298 | idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1299 | if (idx_end > idx_start) { | |
ca52fec1 | 1300 | pgoff_t l_npages = 1 + idx_end - idx_start; |
1c75950b TM |
1301 | npages = l_npages; |
1302 | if (sizeof(npages) != sizeof(l_npages) && | |
ca52fec1 | 1303 | (pgoff_t)npages != l_npages) |
1c75950b TM |
1304 | npages = 0; |
1305 | } | |
1306 | } | |
c42de9dd | 1307 | how &= ~FLUSH_NOCOMMIT; |
587142f8 | 1308 | spin_lock(&inode->i_lock); |
1da177e4 | 1309 | do { |
c42de9dd TM |
1310 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); |
1311 | if (ret != 0) | |
70b9ecbd | 1312 | continue; |
c42de9dd TM |
1313 | if (nocommit) |
1314 | break; | |
d2ccddf0 | 1315 | pages = nfs_scan_commit(inode, &head, idx_start, npages); |
724c439c | 1316 | if (pages == 0) |
c42de9dd | 1317 | break; |
d2ccddf0 | 1318 | if (how & FLUSH_INVALIDATE) { |
587142f8 | 1319 | spin_unlock(&inode->i_lock); |
83715ad5 | 1320 | nfs_cancel_commit_list(&head); |
e8e058e8 | 1321 | ret = pages; |
587142f8 | 1322 | spin_lock(&inode->i_lock); |
d2ccddf0 TM |
1323 | continue; |
1324 | } | |
1325 | pages += nfs_scan_commit(inode, &head, 0, 0); | |
587142f8 | 1326 | spin_unlock(&inode->i_lock); |
c42de9dd | 1327 | ret = nfs_commit_list(inode, &head, how); |
587142f8 TM |
1328 | spin_lock(&inode->i_lock); |
1329 | ||
c42de9dd | 1330 | } while (ret >= 0); |
587142f8 | 1331 | spin_unlock(&inode->i_lock); |
c42de9dd | 1332 | return ret; |
1da177e4 LT |
1333 | } |
1334 | ||
34901f70 | 1335 | static int __nfs_write_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) |
1c75950b | 1336 | { |
1c75950b TM |
1337 | int ret; |
1338 | ||
34901f70 | 1339 | ret = nfs_writepages(mapping, wbc); |
61822ab5 TM |
1340 | if (ret < 0) |
1341 | goto out; | |
34901f70 | 1342 | ret = nfs_sync_mapping_wait(mapping, wbc, how); |
ed90ef51 TM |
1343 | if (ret < 0) |
1344 | goto out; | |
1345 | return 0; | |
61822ab5 | 1346 | out: |
e507d9eb | 1347 | __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); |
1c75950b TM |
1348 | return ret; |
1349 | } | |
1350 | ||
34901f70 TM |
1351 | /* Two pass sync: first using WB_SYNC_NONE, then WB_SYNC_ALL */ |
1352 | static int nfs_write_mapping(struct address_space *mapping, int how) | |
1353 | { | |
1354 | struct writeback_control wbc = { | |
1355 | .bdi = mapping->backing_dev_info, | |
1356 | .sync_mode = WB_SYNC_NONE, | |
1357 | .nr_to_write = LONG_MAX, | |
1358 | .for_writepages = 1, | |
1359 | .range_cyclic = 1, | |
1360 | }; | |
1361 | int ret; | |
1362 | ||
1363 | ret = __nfs_write_mapping(mapping, &wbc, how); | |
1364 | if (ret < 0) | |
1365 | return ret; | |
1366 | wbc.sync_mode = WB_SYNC_ALL; | |
1367 | return __nfs_write_mapping(mapping, &wbc, how); | |
1368 | } | |
1369 | ||
ed90ef51 TM |
1370 | /* |
1371 | * flush the inode to disk. | |
1372 | */ | |
1373 | int nfs_wb_all(struct inode *inode) | |
1c75950b | 1374 | { |
ed90ef51 TM |
1375 | return nfs_write_mapping(inode->i_mapping, 0); |
1376 | } | |
1c75950b | 1377 | |
ed90ef51 TM |
1378 | int nfs_wb_nocommit(struct inode *inode) |
1379 | { | |
1380 | return nfs_write_mapping(inode->i_mapping, FLUSH_NOCOMMIT); | |
1c75950b TM |
1381 | } |
1382 | ||
1b3b4a1a TM |
1383 | int nfs_wb_page_cancel(struct inode *inode, struct page *page) |
1384 | { | |
1385 | struct nfs_page *req; | |
1386 | loff_t range_start = page_offset(page); | |
1387 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
1388 | struct writeback_control wbc = { | |
1389 | .bdi = page->mapping->backing_dev_info, | |
1390 | .sync_mode = WB_SYNC_ALL, | |
1391 | .nr_to_write = LONG_MAX, | |
1392 | .range_start = range_start, | |
1393 | .range_end = range_end, | |
1394 | }; | |
1395 | int ret = 0; | |
1396 | ||
1397 | BUG_ON(!PageLocked(page)); | |
1398 | for (;;) { | |
1399 | req = nfs_page_find_request(page); | |
1400 | if (req == NULL) | |
1401 | goto out; | |
1402 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
1403 | nfs_release_request(req); | |
1404 | break; | |
1405 | } | |
1406 | if (nfs_lock_request_dontget(req)) { | |
1407 | nfs_inode_remove_request(req); | |
1408 | /* | |
1409 | * In case nfs_inode_remove_request has marked the | |
1410 | * page as being dirty | |
1411 | */ | |
1412 | cancel_dirty_page(page, PAGE_CACHE_SIZE); | |
1413 | nfs_unlock_request(req); | |
1414 | break; | |
1415 | } | |
1416 | ret = nfs_wait_on_request(req); | |
1417 | if (ret < 0) | |
1418 | goto out; | |
1419 | } | |
1420 | if (!PagePrivate(page)) | |
1421 | return 0; | |
1422 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, FLUSH_INVALIDATE); | |
1423 | out: | |
1424 | return ret; | |
1425 | } | |
1426 | ||
61822ab5 | 1427 | int nfs_wb_page_priority(struct inode *inode, struct page *page, int how) |
1c75950b TM |
1428 | { |
1429 | loff_t range_start = page_offset(page); | |
1430 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
4d770ccf TM |
1431 | struct writeback_control wbc = { |
1432 | .bdi = page->mapping->backing_dev_info, | |
1433 | .sync_mode = WB_SYNC_ALL, | |
1434 | .nr_to_write = LONG_MAX, | |
1435 | .range_start = range_start, | |
1436 | .range_end = range_end, | |
1437 | }; | |
1438 | int ret; | |
1c75950b | 1439 | |
4d770ccf | 1440 | BUG_ON(!PageLocked(page)); |
c63c7b05 | 1441 | if (clear_page_dirty_for_io(page)) { |
4d770ccf TM |
1442 | ret = nfs_writepage_locked(page, &wbc); |
1443 | if (ret < 0) | |
1444 | goto out; | |
1445 | } | |
f40313ac TM |
1446 | if (!PagePrivate(page)) |
1447 | return 0; | |
4d770ccf TM |
1448 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); |
1449 | if (ret >= 0) | |
1450 | return 0; | |
1451 | out: | |
e507d9eb | 1452 | __mark_inode_dirty(inode, I_DIRTY_PAGES); |
4d770ccf | 1453 | return ret; |
1c75950b TM |
1454 | } |
1455 | ||
1456 | /* | |
1457 | * Write back all requests on one page - we do this before reading it. | |
1458 | */ | |
1459 | int nfs_wb_page(struct inode *inode, struct page* page) | |
1460 | { | |
4d770ccf | 1461 | return nfs_wb_page_priority(inode, page, FLUSH_STABLE); |
1c75950b TM |
1462 | } |
1463 | ||
f7b422b1 | 1464 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1465 | { |
1466 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1467 | sizeof(struct nfs_write_data), | |
1468 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1469 | NULL); |
1da177e4 LT |
1470 | if (nfs_wdata_cachep == NULL) |
1471 | return -ENOMEM; | |
1472 | ||
93d2341c MD |
1473 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1474 | nfs_wdata_cachep); | |
1da177e4 LT |
1475 | if (nfs_wdata_mempool == NULL) |
1476 | return -ENOMEM; | |
1477 | ||
93d2341c MD |
1478 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1479 | nfs_wdata_cachep); | |
1da177e4 LT |
1480 | if (nfs_commit_mempool == NULL) |
1481 | return -ENOMEM; | |
1482 | ||
89a09141 PZ |
1483 | /* |
1484 | * NFS congestion size, scale with available memory. | |
1485 | * | |
1486 | * 64MB: 8192k | |
1487 | * 128MB: 11585k | |
1488 | * 256MB: 16384k | |
1489 | * 512MB: 23170k | |
1490 | * 1GB: 32768k | |
1491 | * 2GB: 46340k | |
1492 | * 4GB: 65536k | |
1493 | * 8GB: 92681k | |
1494 | * 16GB: 131072k | |
1495 | * | |
1496 | * This allows larger machines to have larger/more transfers. | |
1497 | * Limit the default to 256M | |
1498 | */ | |
1499 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); | |
1500 | if (nfs_congestion_kb > 256*1024) | |
1501 | nfs_congestion_kb = 256*1024; | |
1502 | ||
1da177e4 LT |
1503 | return 0; |
1504 | } | |
1505 | ||
266bee88 | 1506 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1507 | { |
1508 | mempool_destroy(nfs_commit_mempool); | |
1509 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1510 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1511 | } |
1512 |