Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/write.c | |
3 | * | |
7c85d900 | 4 | * Write file data over NFS. |
1da177e4 LT |
5 | * |
6 | * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de> | |
7 | */ | |
8 | ||
1da177e4 LT |
9 | #include <linux/types.h> |
10 | #include <linux/slab.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/pagemap.h> | |
13 | #include <linux/file.h> | |
1da177e4 | 14 | #include <linux/writeback.h> |
89a09141 | 15 | #include <linux/swap.h> |
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 | SetPageUptodate(page); |
1da177e4 LT |
178 | } |
179 | ||
e21195a7 | 180 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
1da177e4 LT |
181 | unsigned int offset, unsigned int count) |
182 | { | |
183 | struct nfs_page *req; | |
e21195a7 | 184 | int ret; |
1da177e4 | 185 | |
e21195a7 TM |
186 | for (;;) { |
187 | req = nfs_update_request(ctx, page, offset, count); | |
188 | if (!IS_ERR(req)) | |
189 | break; | |
190 | ret = PTR_ERR(req); | |
191 | if (ret != -EBUSY) | |
192 | return ret; | |
193 | ret = nfs_wb_page(page->mapping->host, page); | |
194 | if (ret != 0) | |
195 | return ret; | |
196 | } | |
1da177e4 LT |
197 | /* Update file length */ |
198 | nfs_grow_file(page, offset, count); | |
1da177e4 | 199 | nfs_unlock_request(req); |
abd3e641 | 200 | return 0; |
1da177e4 LT |
201 | } |
202 | ||
203 | static int wb_priority(struct writeback_control *wbc) | |
204 | { | |
205 | if (wbc->for_reclaim) | |
c63c7b05 | 206 | return FLUSH_HIGHPRI | FLUSH_STABLE; |
1da177e4 LT |
207 | if (wbc->for_kupdate) |
208 | return FLUSH_LOWPRI; | |
209 | return 0; | |
210 | } | |
211 | ||
89a09141 PZ |
212 | /* |
213 | * NFS congestion control | |
214 | */ | |
215 | ||
216 | int nfs_congestion_kb; | |
217 | ||
218 | #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) | |
219 | #define NFS_CONGESTION_OFF_THRESH \ | |
220 | (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) | |
221 | ||
5a6d41b3 | 222 | static int nfs_set_page_writeback(struct page *page) |
89a09141 | 223 | { |
5a6d41b3 TM |
224 | int ret = test_set_page_writeback(page); |
225 | ||
226 | if (!ret) { | |
89a09141 PZ |
227 | struct inode *inode = page->mapping->host; |
228 | struct nfs_server *nfss = NFS_SERVER(inode); | |
229 | ||
277866a0 | 230 | if (atomic_long_inc_return(&nfss->writeback) > |
89a09141 PZ |
231 | NFS_CONGESTION_ON_THRESH) |
232 | set_bdi_congested(&nfss->backing_dev_info, WRITE); | |
233 | } | |
5a6d41b3 | 234 | return ret; |
89a09141 PZ |
235 | } |
236 | ||
237 | static void nfs_end_page_writeback(struct page *page) | |
238 | { | |
239 | struct inode *inode = page->mapping->host; | |
240 | struct nfs_server *nfss = NFS_SERVER(inode); | |
241 | ||
242 | end_page_writeback(page); | |
c4dc4bee | 243 | if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) |
89a09141 | 244 | clear_bdi_congested(&nfss->backing_dev_info, WRITE); |
89a09141 PZ |
245 | } |
246 | ||
e261f51f TM |
247 | /* |
248 | * Find an associated nfs write request, and prepare to flush it out | |
9cccef95 | 249 | * May return an error if the user signalled nfs_wait_on_request(). |
e261f51f | 250 | */ |
c63c7b05 TM |
251 | static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, |
252 | struct page *page) | |
e261f51f | 253 | { |
587142f8 TM |
254 | struct inode *inode = page->mapping->host; |
255 | struct nfs_inode *nfsi = NFS_I(inode); | |
e261f51f | 256 | struct nfs_page *req; |
e261f51f TM |
257 | int ret; |
258 | ||
587142f8 | 259 | spin_lock(&inode->i_lock); |
e261f51f TM |
260 | for(;;) { |
261 | req = nfs_page_find_request_locked(page); | |
262 | if (req == NULL) { | |
587142f8 | 263 | spin_unlock(&inode->i_lock); |
9cccef95 | 264 | return 0; |
e261f51f TM |
265 | } |
266 | if (nfs_lock_request_dontget(req)) | |
267 | break; | |
268 | /* Note: If we hold the page lock, as is the case in nfs_writepage, | |
269 | * then the call to nfs_lock_request_dontget() will always | |
270 | * succeed provided that someone hasn't already marked the | |
271 | * request as dirty (in which case we don't care). | |
272 | */ | |
587142f8 | 273 | spin_unlock(&inode->i_lock); |
e261f51f TM |
274 | ret = nfs_wait_on_request(req); |
275 | nfs_release_request(req); | |
276 | if (ret != 0) | |
277 | return ret; | |
587142f8 | 278 | spin_lock(&inode->i_lock); |
e261f51f | 279 | } |
612c9384 TM |
280 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
281 | /* This request is marked for commit */ | |
587142f8 | 282 | spin_unlock(&inode->i_lock); |
612c9384 | 283 | nfs_unlock_request(req); |
c63c7b05 | 284 | nfs_pageio_complete(pgio); |
9cccef95 | 285 | return 0; |
612c9384 | 286 | } |
c63c7b05 | 287 | if (nfs_set_page_writeback(page) != 0) { |
587142f8 | 288 | spin_unlock(&inode->i_lock); |
c63c7b05 TM |
289 | BUG(); |
290 | } | |
291 | radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, | |
9fd367f0 | 292 | NFS_PAGE_TAG_LOCKED); |
587142f8 | 293 | spin_unlock(&inode->i_lock); |
c63c7b05 | 294 | nfs_pageio_add_request(pgio, req); |
9cccef95 | 295 | return 0; |
e261f51f TM |
296 | } |
297 | ||
f758c885 | 298 | static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) |
1da177e4 | 299 | { |
1da177e4 | 300 | struct inode *inode = page->mapping->host; |
1da177e4 | 301 | |
91d5b470 CL |
302 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
303 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
304 | ||
7fe7f848 | 305 | nfs_pageio_cond_complete(pgio, page->index); |
f758c885 TM |
306 | return nfs_page_async_flush(pgio, page); |
307 | } | |
7fe7f848 | 308 | |
f758c885 TM |
309 | /* |
310 | * Write an mmapped page to the server. | |
311 | */ | |
312 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
313 | { | |
314 | struct nfs_pageio_descriptor pgio; | |
315 | int err; | |
49a70f27 | 316 | |
f758c885 TM |
317 | nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc)); |
318 | err = nfs_do_writepage(page, wbc, &pgio); | |
319 | nfs_pageio_complete(&pgio); | |
320 | if (err < 0) | |
321 | return err; | |
322 | if (pgio.pg_error < 0) | |
323 | return pgio.pg_error; | |
324 | return 0; | |
4d770ccf TM |
325 | } |
326 | ||
327 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
328 | { | |
f758c885 | 329 | int ret; |
4d770ccf | 330 | |
f758c885 | 331 | ret = nfs_writepage_locked(page, wbc); |
1da177e4 | 332 | unlock_page(page); |
f758c885 TM |
333 | return ret; |
334 | } | |
335 | ||
336 | static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) | |
337 | { | |
338 | int ret; | |
339 | ||
340 | ret = nfs_do_writepage(page, wbc, data); | |
341 | unlock_page(page); | |
342 | return ret; | |
1da177e4 LT |
343 | } |
344 | ||
1da177e4 LT |
345 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) |
346 | { | |
1da177e4 | 347 | struct inode *inode = mapping->host; |
c63c7b05 | 348 | struct nfs_pageio_descriptor pgio; |
1da177e4 LT |
349 | int err; |
350 | ||
91d5b470 CL |
351 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
352 | ||
c63c7b05 | 353 | nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); |
f758c885 | 354 | err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); |
c63c7b05 | 355 | nfs_pageio_complete(&pgio); |
f758c885 | 356 | if (err < 0) |
1da177e4 | 357 | return err; |
f758c885 | 358 | if (pgio.pg_error < 0) |
c63c7b05 TM |
359 | return pgio.pg_error; |
360 | return 0; | |
1da177e4 LT |
361 | } |
362 | ||
363 | /* | |
364 | * Insert a write request into an inode | |
365 | */ | |
366 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) | |
367 | { | |
368 | struct nfs_inode *nfsi = NFS_I(inode); | |
369 | int error; | |
370 | ||
371 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); | |
372 | BUG_ON(error == -EEXIST); | |
373 | if (error) | |
374 | return error; | |
375 | if (!nfsi->npages) { | |
376 | igrab(inode); | |
1da177e4 LT |
377 | if (nfs_have_delegation(inode, FMODE_WRITE)) |
378 | nfsi->change_attr++; | |
379 | } | |
deb7d638 | 380 | SetPagePrivate(req->wb_page); |
277459d2 | 381 | set_page_private(req->wb_page, (unsigned long)req); |
1da177e4 | 382 | nfsi->npages++; |
c03b4024 | 383 | kref_get(&req->wb_kref); |
1da177e4 LT |
384 | return 0; |
385 | } | |
386 | ||
387 | /* | |
89a09141 | 388 | * Remove a write request from an inode |
1da177e4 LT |
389 | */ |
390 | static void nfs_inode_remove_request(struct nfs_page *req) | |
391 | { | |
88be9f99 | 392 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
393 | struct nfs_inode *nfsi = NFS_I(inode); |
394 | ||
395 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
396 | ||
587142f8 | 397 | spin_lock(&inode->i_lock); |
277459d2 | 398 | set_page_private(req->wb_page, 0); |
deb7d638 | 399 | ClearPagePrivate(req->wb_page); |
1da177e4 LT |
400 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
401 | nfsi->npages--; | |
402 | if (!nfsi->npages) { | |
587142f8 | 403 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
404 | iput(inode); |
405 | } else | |
587142f8 | 406 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
407 | nfs_clear_request(req); |
408 | nfs_release_request(req); | |
409 | } | |
410 | ||
61822ab5 TM |
411 | static void |
412 | nfs_redirty_request(struct nfs_page *req) | |
413 | { | |
61822ab5 TM |
414 | __set_page_dirty_nobuffers(req->wb_page); |
415 | } | |
416 | ||
1da177e4 LT |
417 | /* |
418 | * Check if a request is dirty | |
419 | */ | |
420 | static inline int | |
421 | nfs_dirty_request(struct nfs_page *req) | |
422 | { | |
5a6d41b3 TM |
423 | struct page *page = req->wb_page; |
424 | ||
612c9384 | 425 | if (page == NULL || test_bit(PG_NEED_COMMIT, &req->wb_flags)) |
5a6d41b3 TM |
426 | return 0; |
427 | return !PageWriteback(req->wb_page); | |
1da177e4 LT |
428 | } |
429 | ||
430 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
431 | /* | |
432 | * Add a request to the inode's commit list. | |
433 | */ | |
434 | static void | |
435 | nfs_mark_request_commit(struct nfs_page *req) | |
436 | { | |
88be9f99 | 437 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
438 | struct nfs_inode *nfsi = NFS_I(inode); |
439 | ||
587142f8 | 440 | spin_lock(&inode->i_lock); |
1da177e4 | 441 | nfsi->ncommit++; |
612c9384 | 442 | set_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
5c369683 TM |
443 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
444 | req->wb_index, | |
445 | NFS_PAGE_TAG_COMMIT); | |
587142f8 | 446 | spin_unlock(&inode->i_lock); |
fd39fc85 | 447 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 | 448 | inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE); |
a1803044 | 449 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1da177e4 | 450 | } |
8e821cad TM |
451 | |
452 | static inline | |
453 | int nfs_write_need_commit(struct nfs_write_data *data) | |
454 | { | |
455 | return data->verf.committed != NFS_FILE_SYNC; | |
456 | } | |
457 | ||
458 | static inline | |
459 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
460 | { | |
612c9384 | 461 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
8e821cad TM |
462 | nfs_mark_request_commit(req); |
463 | return 1; | |
464 | } | |
465 | if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { | |
466 | nfs_redirty_request(req); | |
467 | return 1; | |
468 | } | |
469 | return 0; | |
470 | } | |
471 | #else | |
472 | static inline void | |
473 | nfs_mark_request_commit(struct nfs_page *req) | |
474 | { | |
475 | } | |
476 | ||
477 | static inline | |
478 | int nfs_write_need_commit(struct nfs_write_data *data) | |
479 | { | |
480 | return 0; | |
481 | } | |
482 | ||
483 | static inline | |
484 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
485 | { | |
486 | return 0; | |
487 | } | |
1da177e4 LT |
488 | #endif |
489 | ||
490 | /* | |
491 | * Wait for a request to complete. | |
492 | * | |
493 | * Interruptible by signals only if mounted with intr flag. | |
494 | */ | |
ca52fec1 | 495 | static int nfs_wait_on_requests_locked(struct inode *inode, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
496 | { |
497 | struct nfs_inode *nfsi = NFS_I(inode); | |
498 | struct nfs_page *req; | |
ca52fec1 | 499 | pgoff_t idx_end, next; |
1da177e4 LT |
500 | unsigned int res = 0; |
501 | int error; | |
502 | ||
503 | if (npages == 0) | |
504 | idx_end = ~0; | |
505 | else | |
506 | idx_end = idx_start + npages - 1; | |
507 | ||
1da177e4 | 508 | next = idx_start; |
9fd367f0 | 509 | while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_LOCKED)) { |
1da177e4 LT |
510 | if (req->wb_index > idx_end) |
511 | break; | |
512 | ||
513 | next = req->wb_index + 1; | |
c6a556b8 | 514 | BUG_ON(!NFS_WBACK_BUSY(req)); |
1da177e4 | 515 | |
c03b4024 | 516 | kref_get(&req->wb_kref); |
587142f8 | 517 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
518 | error = nfs_wait_on_request(req); |
519 | nfs_release_request(req); | |
587142f8 | 520 | spin_lock(&inode->i_lock); |
1da177e4 LT |
521 | if (error < 0) |
522 | return error; | |
1da177e4 LT |
523 | res++; |
524 | } | |
1da177e4 LT |
525 | return res; |
526 | } | |
527 | ||
83715ad5 TM |
528 | static void nfs_cancel_commit_list(struct list_head *head) |
529 | { | |
530 | struct nfs_page *req; | |
531 | ||
532 | while(!list_empty(head)) { | |
533 | req = nfs_list_entry(head->next); | |
b6dff26a | 534 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 PZ |
535 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
536 | BDI_RECLAIMABLE); | |
83715ad5 | 537 | nfs_list_remove_request(req); |
612c9384 | 538 | clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
83715ad5 | 539 | nfs_inode_remove_request(req); |
b6dff26a | 540 | nfs_unlock_request(req); |
83715ad5 TM |
541 | } |
542 | } | |
543 | ||
1da177e4 LT |
544 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
545 | /* | |
546 | * nfs_scan_commit - Scan an inode for commit requests | |
547 | * @inode: NFS inode to scan | |
548 | * @dst: destination list | |
549 | * @idx_start: lower bound of page->index to scan. | |
550 | * @npages: idx_start + npages sets the upper bound to scan. | |
551 | * | |
552 | * Moves requests from the inode's 'commit' request list. | |
553 | * The requests are *not* checked to ensure that they form a contiguous set. | |
554 | */ | |
555 | static int | |
ca52fec1 | 556 | nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
557 | { |
558 | struct nfs_inode *nfsi = NFS_I(inode); | |
3da28eb1 TM |
559 | int res = 0; |
560 | ||
561 | if (nfsi->ncommit != 0) { | |
5c369683 TM |
562 | res = nfs_scan_list(nfsi, dst, idx_start, npages, |
563 | NFS_PAGE_TAG_COMMIT); | |
3da28eb1 | 564 | nfsi->ncommit -= res; |
3da28eb1 | 565 | } |
1da177e4 LT |
566 | return res; |
567 | } | |
c42de9dd | 568 | #else |
ca52fec1 | 569 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
c42de9dd TM |
570 | { |
571 | return 0; | |
572 | } | |
1da177e4 LT |
573 | #endif |
574 | ||
1da177e4 LT |
575 | /* |
576 | * Try to update any existing write request, or create one if there is none. | |
577 | * In order to match, the request's credentials must match those of | |
578 | * the calling process. | |
579 | * | |
580 | * Note: Should always be called with the Page Lock held! | |
581 | */ | |
582 | static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, | |
e21195a7 | 583 | struct page *page, unsigned int offset, unsigned int bytes) |
1da177e4 | 584 | { |
89a09141 PZ |
585 | struct address_space *mapping = page->mapping; |
586 | struct inode *inode = mapping->host; | |
1da177e4 | 587 | struct nfs_page *req, *new = NULL; |
ca52fec1 | 588 | pgoff_t rqend, end; |
1da177e4 LT |
589 | |
590 | end = offset + bytes; | |
591 | ||
1da177e4 LT |
592 | for (;;) { |
593 | /* Loop over all inode entries and see if we find | |
594 | * A request for the page we wish to update | |
595 | */ | |
587142f8 | 596 | spin_lock(&inode->i_lock); |
277459d2 | 597 | req = nfs_page_find_request_locked(page); |
1da177e4 LT |
598 | if (req) { |
599 | if (!nfs_lock_request_dontget(req)) { | |
600 | int error; | |
277459d2 | 601 | |
587142f8 | 602 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
603 | error = nfs_wait_on_request(req); |
604 | nfs_release_request(req); | |
1dd594b2 NB |
605 | if (error < 0) { |
606 | if (new) | |
607 | nfs_release_request(new); | |
1da177e4 | 608 | return ERR_PTR(error); |
1dd594b2 | 609 | } |
1da177e4 LT |
610 | continue; |
611 | } | |
587142f8 | 612 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
613 | if (new) |
614 | nfs_release_request(new); | |
615 | break; | |
616 | } | |
617 | ||
618 | if (new) { | |
619 | int error; | |
620 | nfs_lock_request_dontget(new); | |
621 | error = nfs_inode_add_request(inode, new); | |
622 | if (error) { | |
587142f8 | 623 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
624 | nfs_unlock_request(new); |
625 | return ERR_PTR(error); | |
626 | } | |
587142f8 | 627 | spin_unlock(&inode->i_lock); |
61e930a9 TM |
628 | req = new; |
629 | goto zero_page; | |
1da177e4 | 630 | } |
587142f8 | 631 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
632 | |
633 | new = nfs_create_request(ctx, inode, page, offset, bytes); | |
634 | if (IS_ERR(new)) | |
635 | return new; | |
636 | } | |
637 | ||
638 | /* We have a request for our page. | |
639 | * If the creds don't match, or the | |
640 | * page addresses don't match, | |
641 | * tell the caller to wait on the conflicting | |
642 | * request. | |
643 | */ | |
644 | rqend = req->wb_offset + req->wb_bytes; | |
645 | if (req->wb_context != ctx | |
646 | || req->wb_page != page | |
647 | || !nfs_dirty_request(req) | |
648 | || offset > rqend || end < req->wb_offset) { | |
649 | nfs_unlock_request(req); | |
650 | return ERR_PTR(-EBUSY); | |
651 | } | |
652 | ||
653 | /* Okay, the request matches. Update the region */ | |
654 | if (offset < req->wb_offset) { | |
655 | req->wb_offset = offset; | |
656 | req->wb_pgbase = offset; | |
61e930a9 TM |
657 | req->wb_bytes = max(end, rqend) - req->wb_offset; |
658 | goto zero_page; | |
1da177e4 LT |
659 | } |
660 | ||
661 | if (end > rqend) | |
662 | req->wb_bytes = end - req->wb_offset; | |
663 | ||
664 | return req; | |
61e930a9 TM |
665 | zero_page: |
666 | /* If this page might potentially be marked as up to date, | |
667 | * then we need to zero any uninitalised data. */ | |
668 | if (req->wb_pgbase == 0 && req->wb_bytes != PAGE_CACHE_SIZE | |
669 | && !PageUptodate(req->wb_page)) | |
670 | zero_user_page(req->wb_page, req->wb_bytes, | |
671 | PAGE_CACHE_SIZE - req->wb_bytes, | |
672 | KM_USER0); | |
673 | return req; | |
1da177e4 LT |
674 | } |
675 | ||
676 | int nfs_flush_incompatible(struct file *file, struct page *page) | |
677 | { | |
cd3758e3 | 678 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 679 | struct nfs_page *req; |
1a54533e | 680 | int do_flush, status; |
1da177e4 LT |
681 | /* |
682 | * Look for a request corresponding to this page. If there | |
683 | * is one, and it belongs to another file, we flush it out | |
684 | * before we try to copy anything into the page. Do this | |
685 | * due to the lack of an ACCESS-type call in NFSv2. | |
686 | * Also do the same if we find a request from an existing | |
687 | * dropped page. | |
688 | */ | |
1a54533e TM |
689 | do { |
690 | req = nfs_page_find_request(page); | |
691 | if (req == NULL) | |
692 | return 0; | |
693 | do_flush = req->wb_page != page || req->wb_context != ctx | |
e261f51f | 694 | || !nfs_dirty_request(req); |
1da177e4 | 695 | nfs_release_request(req); |
1a54533e TM |
696 | if (!do_flush) |
697 | return 0; | |
698 | status = nfs_wb_page(page->mapping->host, page); | |
699 | } while (status == 0); | |
700 | return status; | |
1da177e4 LT |
701 | } |
702 | ||
703 | /* | |
704 | * Update and possibly write a cached page of an NFS file. | |
705 | * | |
706 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
707 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
708 | */ | |
709 | int nfs_updatepage(struct file *file, struct page *page, | |
710 | unsigned int offset, unsigned int count) | |
711 | { | |
cd3758e3 | 712 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 713 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
714 | int status = 0; |
715 | ||
91d5b470 CL |
716 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
717 | ||
1da177e4 | 718 | dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", |
01cce933 JJS |
719 | file->f_path.dentry->d_parent->d_name.name, |
720 | file->f_path.dentry->d_name.name, count, | |
0bbacc40 | 721 | (long long)(page_offset(page) +offset)); |
1da177e4 | 722 | |
1da177e4 LT |
723 | /* If we're not using byte range locks, and we know the page |
724 | * is entirely in cache, it may be more efficient to avoid | |
725 | * fragmenting write requests. | |
726 | */ | |
ab0a3dbe | 727 | if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) { |
49a70f27 | 728 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 729 | offset = 0; |
1da177e4 LT |
730 | } |
731 | ||
e21195a7 | 732 | status = nfs_writepage_setup(ctx, page, offset, count); |
e261f51f | 733 | __set_page_dirty_nobuffers(page); |
1da177e4 | 734 | |
1da177e4 LT |
735 | dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", |
736 | status, (long long)i_size_read(inode)); | |
737 | if (status < 0) | |
a301b777 | 738 | nfs_set_pageerror(page); |
1da177e4 LT |
739 | return status; |
740 | } | |
741 | ||
742 | static void nfs_writepage_release(struct nfs_page *req) | |
743 | { | |
1da177e4 | 744 | |
44dd151d TM |
745 | if (PageError(req->wb_page)) { |
746 | nfs_end_page_writeback(req->wb_page); | |
747 | nfs_inode_remove_request(req); | |
748 | } else if (!nfs_reschedule_unstable_write(req)) { | |
749 | /* Set the PG_uptodate flag */ | |
750 | nfs_mark_uptodate(req->wb_page, req->wb_pgbase, req->wb_bytes); | |
8e821cad TM |
751 | nfs_end_page_writeback(req->wb_page); |
752 | nfs_inode_remove_request(req); | |
753 | } else | |
754 | nfs_end_page_writeback(req->wb_page); | |
9fd367f0 | 755 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
756 | } |
757 | ||
758 | static inline int flush_task_priority(int how) | |
759 | { | |
760 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
761 | case FLUSH_HIGHPRI: | |
762 | return RPC_PRIORITY_HIGH; | |
763 | case FLUSH_LOWPRI: | |
764 | return RPC_PRIORITY_LOW; | |
765 | } | |
766 | return RPC_PRIORITY_NORMAL; | |
767 | } | |
768 | ||
769 | /* | |
770 | * Set up the argument/result storage required for the RPC call. | |
771 | */ | |
772 | static void nfs_write_rpcsetup(struct nfs_page *req, | |
773 | struct nfs_write_data *data, | |
788e7a89 | 774 | const struct rpc_call_ops *call_ops, |
1da177e4 LT |
775 | unsigned int count, unsigned int offset, |
776 | int how) | |
777 | { | |
1da177e4 | 778 | struct inode *inode; |
788e7a89 | 779 | int flags; |
1da177e4 LT |
780 | |
781 | /* Set up the RPC argument and reply structs | |
782 | * NB: take care not to mess about with data->commit et al. */ | |
783 | ||
784 | data->req = req; | |
88be9f99 | 785 | data->inode = inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
786 | data->cred = req->wb_context->cred; |
787 | ||
788 | data->args.fh = NFS_FH(inode); | |
789 | data->args.offset = req_offset(req) + offset; | |
790 | data->args.pgbase = req->wb_pgbase + offset; | |
791 | data->args.pages = data->pagevec; | |
792 | data->args.count = count; | |
793 | data->args.context = req->wb_context; | |
794 | ||
795 | data->res.fattr = &data->fattr; | |
796 | data->res.count = count; | |
797 | data->res.verf = &data->verf; | |
0e574af1 | 798 | nfs_fattr_init(&data->fattr); |
1da177e4 | 799 | |
788e7a89 TM |
800 | /* Set up the initial task struct. */ |
801 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
802 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data); | |
1da177e4 LT |
803 | NFS_PROTO(inode)->write_setup(data, how); |
804 | ||
805 | data->task.tk_priority = flush_task_priority(how); | |
806 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 807 | |
a3f565b1 CL |
808 | dprintk("NFS: %5u initiated write call " |
809 | "(req %s/%Ld, %u bytes @ offset %Lu)\n", | |
0bbacc40 | 810 | data->task.tk_pid, |
1da177e4 LT |
811 | inode->i_sb->s_id, |
812 | (long long)NFS_FILEID(inode), | |
813 | count, | |
814 | (unsigned long long)data->args.offset); | |
815 | } | |
816 | ||
817 | static void nfs_execute_write(struct nfs_write_data *data) | |
818 | { | |
819 | struct rpc_clnt *clnt = NFS_CLIENT(data->inode); | |
820 | sigset_t oldset; | |
821 | ||
822 | rpc_clnt_sigmask(clnt, &oldset); | |
1da177e4 | 823 | rpc_execute(&data->task); |
1da177e4 LT |
824 | rpc_clnt_sigunmask(clnt, &oldset); |
825 | } | |
826 | ||
827 | /* | |
828 | * Generate multiple small requests to write out a single | |
829 | * contiguous dirty area on one page. | |
830 | */ | |
8d5658c9 | 831 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
832 | { |
833 | struct nfs_page *req = nfs_list_entry(head->next); | |
834 | struct page *page = req->wb_page; | |
835 | struct nfs_write_data *data; | |
e9f7bee1 TM |
836 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
837 | unsigned int offset; | |
1da177e4 LT |
838 | int requests = 0; |
839 | LIST_HEAD(list); | |
840 | ||
841 | nfs_list_remove_request(req); | |
842 | ||
bcb71bba | 843 | nbytes = count; |
e9f7bee1 TM |
844 | do { |
845 | size_t len = min(nbytes, wsize); | |
846 | ||
8d5658c9 | 847 | data = nfs_writedata_alloc(1); |
1da177e4 LT |
848 | if (!data) |
849 | goto out_bad; | |
850 | list_add(&data->pages, &list); | |
851 | requests++; | |
e9f7bee1 TM |
852 | nbytes -= len; |
853 | } while (nbytes != 0); | |
1da177e4 LT |
854 | atomic_set(&req->wb_complete, requests); |
855 | ||
856 | ClearPageError(page); | |
1da177e4 | 857 | offset = 0; |
bcb71bba | 858 | nbytes = count; |
1da177e4 LT |
859 | do { |
860 | data = list_entry(list.next, struct nfs_write_data, pages); | |
861 | list_del_init(&data->pages); | |
862 | ||
863 | data->pagevec[0] = page; | |
1da177e4 | 864 | |
bcb71bba TM |
865 | if (nbytes < wsize) |
866 | wsize = nbytes; | |
867 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, | |
868 | wsize, offset, how); | |
869 | offset += wsize; | |
870 | nbytes -= wsize; | |
1da177e4 LT |
871 | nfs_execute_write(data); |
872 | } while (nbytes != 0); | |
873 | ||
874 | return 0; | |
875 | ||
876 | out_bad: | |
877 | while (!list_empty(&list)) { | |
878 | data = list_entry(list.next, struct nfs_write_data, pages); | |
879 | list_del(&data->pages); | |
8aca67f0 | 880 | nfs_writedata_release(data); |
1da177e4 | 881 | } |
61822ab5 | 882 | nfs_redirty_request(req); |
6d677e35 | 883 | nfs_end_page_writeback(req->wb_page); |
9fd367f0 | 884 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
885 | return -ENOMEM; |
886 | } | |
887 | ||
888 | /* | |
889 | * Create an RPC task for the given write request and kick it. | |
890 | * The page must have been locked by the caller. | |
891 | * | |
892 | * It may happen that the page we're passed is not marked dirty. | |
893 | * This is the case if nfs_updatepage detects a conflicting request | |
894 | * that has been written but not committed. | |
895 | */ | |
8d5658c9 | 896 | static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
897 | { |
898 | struct nfs_page *req; | |
899 | struct page **pages; | |
900 | struct nfs_write_data *data; | |
1da177e4 | 901 | |
8d5658c9 | 902 | data = nfs_writedata_alloc(npages); |
1da177e4 LT |
903 | if (!data) |
904 | goto out_bad; | |
905 | ||
906 | pages = data->pagevec; | |
1da177e4 LT |
907 | while (!list_empty(head)) { |
908 | req = nfs_list_entry(head->next); | |
909 | nfs_list_remove_request(req); | |
910 | nfs_list_add_request(req, &data->pages); | |
911 | ClearPageError(req->wb_page); | |
1da177e4 | 912 | *pages++ = req->wb_page; |
1da177e4 LT |
913 | } |
914 | req = nfs_list_entry(data->pages.next); | |
915 | ||
1da177e4 | 916 | /* Set up the argument struct */ |
788e7a89 | 917 | nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 LT |
918 | |
919 | nfs_execute_write(data); | |
920 | return 0; | |
921 | out_bad: | |
922 | while (!list_empty(head)) { | |
10afec90 | 923 | req = nfs_list_entry(head->next); |
1da177e4 | 924 | nfs_list_remove_request(req); |
61822ab5 | 925 | nfs_redirty_request(req); |
6d677e35 | 926 | nfs_end_page_writeback(req->wb_page); |
9fd367f0 | 927 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
928 | } |
929 | return -ENOMEM; | |
930 | } | |
931 | ||
c63c7b05 TM |
932 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, |
933 | struct inode *inode, int ioflags) | |
1da177e4 | 934 | { |
7d46a49f | 935 | int wsize = NFS_SERVER(inode)->wsize; |
1da177e4 | 936 | |
bcb71bba | 937 | if (wsize < PAGE_CACHE_SIZE) |
c63c7b05 | 938 | nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); |
bcb71bba | 939 | else |
c63c7b05 | 940 | nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); |
1da177e4 LT |
941 | } |
942 | ||
943 | /* | |
944 | * Handle a write reply that flushed part of a page. | |
945 | */ | |
788e7a89 | 946 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 947 | { |
788e7a89 | 948 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
949 | struct nfs_page *req = data->req; |
950 | struct page *page = req->wb_page; | |
951 | ||
952 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
88be9f99 TM |
953 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
954 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
955 | req->wb_bytes, |
956 | (long long)req_offset(req)); | |
957 | ||
788e7a89 TM |
958 | if (nfs_writeback_done(task, data) != 0) |
959 | return; | |
960 | ||
961 | if (task->tk_status < 0) { | |
a301b777 | 962 | nfs_set_pageerror(page); |
7b159fc1 | 963 | nfs_context_set_write_error(req->wb_context, task->tk_status); |
788e7a89 | 964 | dprintk(", error = %d\n", task->tk_status); |
8e821cad | 965 | goto out; |
1da177e4 LT |
966 | } |
967 | ||
8e821cad | 968 | if (nfs_write_need_commit(data)) { |
587142f8 | 969 | struct inode *inode = page->mapping->host; |
8e821cad | 970 | |
587142f8 | 971 | spin_lock(&inode->i_lock); |
8e821cad TM |
972 | if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { |
973 | /* Do nothing we need to resend the writes */ | |
974 | } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
975 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
976 | dprintk(" defer commit\n"); | |
977 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
978 | set_bit(PG_NEED_RESCHED, &req->wb_flags); | |
979 | clear_bit(PG_NEED_COMMIT, &req->wb_flags); | |
980 | dprintk(" server reboot detected\n"); | |
981 | } | |
587142f8 | 982 | spin_unlock(&inode->i_lock); |
8e821cad TM |
983 | } else |
984 | dprintk(" OK\n"); | |
985 | ||
986 | out: | |
1da177e4 LT |
987 | if (atomic_dec_and_test(&req->wb_complete)) |
988 | nfs_writepage_release(req); | |
989 | } | |
990 | ||
788e7a89 TM |
991 | static const struct rpc_call_ops nfs_write_partial_ops = { |
992 | .rpc_call_done = nfs_writeback_done_partial, | |
993 | .rpc_release = nfs_writedata_release, | |
994 | }; | |
995 | ||
1da177e4 LT |
996 | /* |
997 | * Handle a write reply that flushes a whole page. | |
998 | * | |
999 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
1000 | * writebacks since the page->count is kept > 1 for as long | |
1001 | * as the page has a write request pending. | |
1002 | */ | |
788e7a89 | 1003 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 1004 | { |
788e7a89 | 1005 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
1006 | struct nfs_page *req; |
1007 | struct page *page; | |
1008 | ||
788e7a89 TM |
1009 | if (nfs_writeback_done(task, data) != 0) |
1010 | return; | |
1011 | ||
1da177e4 LT |
1012 | /* Update attributes as result of writeback. */ |
1013 | while (!list_empty(&data->pages)) { | |
1014 | req = nfs_list_entry(data->pages.next); | |
1015 | nfs_list_remove_request(req); | |
1016 | page = req->wb_page; | |
1017 | ||
1018 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
88be9f99 TM |
1019 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1020 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1021 | req->wb_bytes, |
1022 | (long long)req_offset(req)); | |
1023 | ||
788e7a89 | 1024 | if (task->tk_status < 0) { |
a301b777 | 1025 | nfs_set_pageerror(page); |
7b159fc1 | 1026 | nfs_context_set_write_error(req->wb_context, task->tk_status); |
788e7a89 | 1027 | dprintk(", error = %d\n", task->tk_status); |
8e821cad | 1028 | goto remove_request; |
1da177e4 | 1029 | } |
1da177e4 | 1030 | |
8e821cad TM |
1031 | if (nfs_write_need_commit(data)) { |
1032 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1033 | nfs_mark_request_commit(req); | |
1034 | nfs_end_page_writeback(page); | |
1035 | dprintk(" marked for commit\n"); | |
1da177e4 LT |
1036 | goto next; |
1037 | } | |
44dd151d TM |
1038 | /* Set the PG_uptodate flag? */ |
1039 | nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); | |
8e821cad TM |
1040 | dprintk(" OK\n"); |
1041 | remove_request: | |
1042 | nfs_end_page_writeback(page); | |
1da177e4 | 1043 | nfs_inode_remove_request(req); |
1da177e4 | 1044 | next: |
9fd367f0 | 1045 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
1046 | } |
1047 | } | |
1048 | ||
788e7a89 TM |
1049 | static const struct rpc_call_ops nfs_write_full_ops = { |
1050 | .rpc_call_done = nfs_writeback_done_full, | |
1051 | .rpc_release = nfs_writedata_release, | |
1052 | }; | |
1053 | ||
1054 | ||
1da177e4 LT |
1055 | /* |
1056 | * This function is called when the WRITE call is complete. | |
1057 | */ | |
462d5b32 | 1058 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1059 | { |
1da177e4 LT |
1060 | struct nfs_writeargs *argp = &data->args; |
1061 | struct nfs_writeres *resp = &data->res; | |
788e7a89 | 1062 | int status; |
1da177e4 | 1063 | |
a3f565b1 | 1064 | dprintk("NFS: %5u nfs_writeback_done (status %d)\n", |
1da177e4 LT |
1065 | task->tk_pid, task->tk_status); |
1066 | ||
f551e44f CL |
1067 | /* |
1068 | * ->write_done will attempt to use post-op attributes to detect | |
1069 | * conflicting writes by other clients. A strict interpretation | |
1070 | * of close-to-open would allow us to continue caching even if | |
1071 | * another writer had changed the file, but some applications | |
1072 | * depend on tighter cache coherency when writing. | |
1073 | */ | |
788e7a89 TM |
1074 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1075 | if (status != 0) | |
1076 | return status; | |
91d5b470 CL |
1077 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1078 | ||
1da177e4 LT |
1079 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1080 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1081 | /* We tried a write call, but the server did not | |
1082 | * commit data to stable storage even though we | |
1083 | * requested it. | |
1084 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1085 | * the server reports NFS_DATA_SYNC, but performs | |
1086 | * NFS_FILE_SYNC. We therefore implement this checking | |
1087 | * as a dprintk() in order to avoid filling syslog. | |
1088 | */ | |
1089 | static unsigned long complain; | |
1090 | ||
1091 | if (time_before(complain, jiffies)) { | |
1092 | dprintk("NFS: faulty NFS server %s:" | |
1093 | " (committed = %d) != (stable = %d)\n", | |
54ceac45 | 1094 | NFS_SERVER(data->inode)->nfs_client->cl_hostname, |
1da177e4 LT |
1095 | resp->verf->committed, argp->stable); |
1096 | complain = jiffies + 300 * HZ; | |
1097 | } | |
1098 | } | |
1099 | #endif | |
1100 | /* Is this a short write? */ | |
1101 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1102 | static unsigned long complain; | |
1103 | ||
91d5b470 CL |
1104 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1105 | ||
1da177e4 LT |
1106 | /* Has the server at least made some progress? */ |
1107 | if (resp->count != 0) { | |
1108 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1109 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1110 | /* Resend from where the server left off */ | |
1111 | argp->offset += resp->count; | |
1112 | argp->pgbase += resp->count; | |
1113 | argp->count -= resp->count; | |
1114 | } else { | |
1115 | /* Resend as a stable write in order to avoid | |
1116 | * headaches in the case of a server crash. | |
1117 | */ | |
1118 | argp->stable = NFS_FILE_SYNC; | |
1119 | } | |
1120 | rpc_restart_call(task); | |
788e7a89 | 1121 | return -EAGAIN; |
1da177e4 LT |
1122 | } |
1123 | if (time_before(complain, jiffies)) { | |
1124 | printk(KERN_WARNING | |
1125 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1126 | argp->count); | |
1127 | complain = jiffies + 300 * HZ; | |
1128 | } | |
1129 | /* Can't do anything about it except throw an error. */ | |
1130 | task->tk_status = -EIO; | |
1131 | } | |
788e7a89 | 1132 | return 0; |
1da177e4 LT |
1133 | } |
1134 | ||
1135 | ||
1136 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
963d8fe5 | 1137 | void nfs_commit_release(void *wdata) |
1da177e4 | 1138 | { |
1da177e4 LT |
1139 | nfs_commit_free(wdata); |
1140 | } | |
1141 | ||
1142 | /* | |
1143 | * Set up the argument/result storage required for the RPC call. | |
1144 | */ | |
1145 | static void nfs_commit_rpcsetup(struct list_head *head, | |
788e7a89 TM |
1146 | struct nfs_write_data *data, |
1147 | int how) | |
1da177e4 | 1148 | { |
3da28eb1 | 1149 | struct nfs_page *first; |
1da177e4 | 1150 | struct inode *inode; |
788e7a89 | 1151 | int flags; |
1da177e4 LT |
1152 | |
1153 | /* Set up the RPC argument and reply structs | |
1154 | * NB: take care not to mess about with data->commit et al. */ | |
1155 | ||
1156 | list_splice_init(head, &data->pages); | |
1157 | first = nfs_list_entry(data->pages.next); | |
88be9f99 | 1158 | inode = first->wb_context->path.dentry->d_inode; |
1da177e4 | 1159 | |
1da177e4 LT |
1160 | data->inode = inode; |
1161 | data->cred = first->wb_context->cred; | |
1162 | ||
1163 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1164 | /* Note: we always request a commit of the entire inode */ |
1165 | data->args.offset = 0; | |
1166 | data->args.count = 0; | |
1167 | data->res.count = 0; | |
1da177e4 LT |
1168 | data->res.fattr = &data->fattr; |
1169 | data->res.verf = &data->verf; | |
0e574af1 | 1170 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1171 | |
1172 | /* Set up the initial task struct. */ | |
1173 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
1174 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data); | |
1da177e4 LT |
1175 | NFS_PROTO(inode)->commit_setup(data, how); |
1176 | ||
1177 | data->task.tk_priority = flush_task_priority(how); | |
1178 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 1179 | |
a3f565b1 | 1180 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); |
1da177e4 LT |
1181 | } |
1182 | ||
1183 | /* | |
1184 | * Commit dirty pages | |
1185 | */ | |
1186 | static int | |
40859d7e | 1187 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1188 | { |
1189 | struct nfs_write_data *data; | |
1190 | struct nfs_page *req; | |
1191 | ||
e9f7bee1 | 1192 | data = nfs_commit_alloc(); |
1da177e4 LT |
1193 | |
1194 | if (!data) | |
1195 | goto out_bad; | |
1196 | ||
1197 | /* Set up the argument struct */ | |
1198 | nfs_commit_rpcsetup(head, data, how); | |
1199 | ||
1200 | nfs_execute_write(data); | |
1201 | return 0; | |
1202 | out_bad: | |
1203 | while (!list_empty(head)) { | |
1204 | req = nfs_list_entry(head->next); | |
1205 | nfs_list_remove_request(req); | |
1206 | nfs_mark_request_commit(req); | |
83715ad5 | 1207 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 PZ |
1208 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
1209 | BDI_RECLAIMABLE); | |
9fd367f0 | 1210 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
1211 | } |
1212 | return -ENOMEM; | |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * COMMIT call returned | |
1217 | */ | |
788e7a89 | 1218 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1219 | { |
963d8fe5 | 1220 | struct nfs_write_data *data = calldata; |
1da177e4 | 1221 | struct nfs_page *req; |
1da177e4 | 1222 | |
a3f565b1 | 1223 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
1da177e4 LT |
1224 | task->tk_pid, task->tk_status); |
1225 | ||
788e7a89 TM |
1226 | /* Call the NFS version-specific code */ |
1227 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1228 | return; | |
1229 | ||
1da177e4 LT |
1230 | while (!list_empty(&data->pages)) { |
1231 | req = nfs_list_entry(data->pages.next); | |
1232 | nfs_list_remove_request(req); | |
612c9384 | 1233 | clear_bit(PG_NEED_COMMIT, &(req)->wb_flags); |
fd39fc85 | 1234 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 PZ |
1235 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
1236 | BDI_RECLAIMABLE); | |
1da177e4 LT |
1237 | |
1238 | dprintk("NFS: commit (%s/%Ld %d@%Ld)", | |
88be9f99 TM |
1239 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1240 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1241 | req->wb_bytes, |
1242 | (long long)req_offset(req)); | |
1243 | if (task->tk_status < 0) { | |
7b159fc1 | 1244 | nfs_context_set_write_error(req->wb_context, task->tk_status); |
1da177e4 LT |
1245 | nfs_inode_remove_request(req); |
1246 | dprintk(", error = %d\n", task->tk_status); | |
1247 | goto next; | |
1248 | } | |
1249 | ||
1250 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1251 | * returned by the server against all stored verfs. */ | |
1252 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1253 | /* We have a match */ | |
44dd151d TM |
1254 | /* Set the PG_uptodate flag */ |
1255 | nfs_mark_uptodate(req->wb_page, req->wb_pgbase, | |
1256 | req->wb_bytes); | |
1da177e4 LT |
1257 | nfs_inode_remove_request(req); |
1258 | dprintk(" OK\n"); | |
1259 | goto next; | |
1260 | } | |
1261 | /* We have a mismatch. Write the page again */ | |
1262 | dprintk(" mismatch\n"); | |
61822ab5 | 1263 | nfs_redirty_request(req); |
1da177e4 | 1264 | next: |
9fd367f0 | 1265 | nfs_clear_page_tag_locked(req); |
1da177e4 | 1266 | } |
1da177e4 | 1267 | } |
788e7a89 TM |
1268 | |
1269 | static const struct rpc_call_ops nfs_commit_ops = { | |
1270 | .rpc_call_done = nfs_commit_done, | |
1271 | .rpc_release = nfs_commit_release, | |
1272 | }; | |
1da177e4 | 1273 | |
3da28eb1 | 1274 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 | 1275 | { |
1da177e4 | 1276 | LIST_HEAD(head); |
7d46a49f | 1277 | int res; |
1da177e4 | 1278 | |
587142f8 | 1279 | spin_lock(&inode->i_lock); |
3da28eb1 | 1280 | res = nfs_scan_commit(inode, &head, 0, 0); |
587142f8 | 1281 | spin_unlock(&inode->i_lock); |
1da177e4 | 1282 | if (res) { |
7d46a49f | 1283 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1284 | if (error < 0) |
1285 | return error; | |
1286 | } | |
1da177e4 LT |
1287 | return res; |
1288 | } | |
c63c7b05 TM |
1289 | #else |
1290 | static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) | |
1291 | { | |
1292 | return 0; | |
1293 | } | |
1da177e4 LT |
1294 | #endif |
1295 | ||
1c75950b | 1296 | long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1297 | { |
1c75950b | 1298 | struct inode *inode = mapping->host; |
ca52fec1 | 1299 | pgoff_t idx_start, idx_end; |
1c75950b | 1300 | unsigned int npages = 0; |
c42de9dd | 1301 | LIST_HEAD(head); |
70b9ecbd | 1302 | int nocommit = how & FLUSH_NOCOMMIT; |
3f442547 | 1303 | long pages, ret; |
1da177e4 | 1304 | |
1c75950b TM |
1305 | /* FIXME */ |
1306 | if (wbc->range_cyclic) | |
1307 | idx_start = 0; | |
1308 | else { | |
1309 | idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1310 | idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1311 | if (idx_end > idx_start) { | |
ca52fec1 | 1312 | pgoff_t l_npages = 1 + idx_end - idx_start; |
1c75950b TM |
1313 | npages = l_npages; |
1314 | if (sizeof(npages) != sizeof(l_npages) && | |
ca52fec1 | 1315 | (pgoff_t)npages != l_npages) |
1c75950b TM |
1316 | npages = 0; |
1317 | } | |
1318 | } | |
c42de9dd | 1319 | how &= ~FLUSH_NOCOMMIT; |
587142f8 | 1320 | spin_lock(&inode->i_lock); |
1da177e4 | 1321 | do { |
c42de9dd TM |
1322 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); |
1323 | if (ret != 0) | |
70b9ecbd | 1324 | continue; |
c42de9dd TM |
1325 | if (nocommit) |
1326 | break; | |
d2ccddf0 | 1327 | pages = nfs_scan_commit(inode, &head, idx_start, npages); |
724c439c | 1328 | if (pages == 0) |
c42de9dd | 1329 | break; |
d2ccddf0 | 1330 | if (how & FLUSH_INVALIDATE) { |
587142f8 | 1331 | spin_unlock(&inode->i_lock); |
83715ad5 | 1332 | nfs_cancel_commit_list(&head); |
e8e058e8 | 1333 | ret = pages; |
587142f8 | 1334 | spin_lock(&inode->i_lock); |
d2ccddf0 TM |
1335 | continue; |
1336 | } | |
1337 | pages += nfs_scan_commit(inode, &head, 0, 0); | |
587142f8 | 1338 | spin_unlock(&inode->i_lock); |
c42de9dd | 1339 | ret = nfs_commit_list(inode, &head, how); |
587142f8 TM |
1340 | spin_lock(&inode->i_lock); |
1341 | ||
c42de9dd | 1342 | } while (ret >= 0); |
587142f8 | 1343 | spin_unlock(&inode->i_lock); |
c42de9dd | 1344 | return ret; |
1da177e4 LT |
1345 | } |
1346 | ||
34901f70 | 1347 | static int __nfs_write_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) |
1c75950b | 1348 | { |
1c75950b TM |
1349 | int ret; |
1350 | ||
34901f70 | 1351 | ret = nfs_writepages(mapping, wbc); |
61822ab5 TM |
1352 | if (ret < 0) |
1353 | goto out; | |
34901f70 | 1354 | ret = nfs_sync_mapping_wait(mapping, wbc, how); |
ed90ef51 TM |
1355 | if (ret < 0) |
1356 | goto out; | |
1357 | return 0; | |
61822ab5 | 1358 | out: |
e507d9eb | 1359 | __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); |
1c75950b TM |
1360 | return ret; |
1361 | } | |
1362 | ||
34901f70 TM |
1363 | /* Two pass sync: first using WB_SYNC_NONE, then WB_SYNC_ALL */ |
1364 | static int nfs_write_mapping(struct address_space *mapping, int how) | |
1365 | { | |
1366 | struct writeback_control wbc = { | |
1367 | .bdi = mapping->backing_dev_info, | |
1368 | .sync_mode = WB_SYNC_NONE, | |
1369 | .nr_to_write = LONG_MAX, | |
1370 | .for_writepages = 1, | |
1371 | .range_cyclic = 1, | |
1372 | }; | |
1373 | int ret; | |
1374 | ||
1375 | ret = __nfs_write_mapping(mapping, &wbc, how); | |
1376 | if (ret < 0) | |
1377 | return ret; | |
1378 | wbc.sync_mode = WB_SYNC_ALL; | |
1379 | return __nfs_write_mapping(mapping, &wbc, how); | |
1380 | } | |
1381 | ||
ed90ef51 TM |
1382 | /* |
1383 | * flush the inode to disk. | |
1384 | */ | |
1385 | int nfs_wb_all(struct inode *inode) | |
1c75950b | 1386 | { |
ed90ef51 TM |
1387 | return nfs_write_mapping(inode->i_mapping, 0); |
1388 | } | |
1c75950b | 1389 | |
ed90ef51 TM |
1390 | int nfs_wb_nocommit(struct inode *inode) |
1391 | { | |
1392 | return nfs_write_mapping(inode->i_mapping, FLUSH_NOCOMMIT); | |
1c75950b TM |
1393 | } |
1394 | ||
1b3b4a1a TM |
1395 | int nfs_wb_page_cancel(struct inode *inode, struct page *page) |
1396 | { | |
1397 | struct nfs_page *req; | |
1398 | loff_t range_start = page_offset(page); | |
1399 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
1400 | struct writeback_control wbc = { | |
1401 | .bdi = page->mapping->backing_dev_info, | |
1402 | .sync_mode = WB_SYNC_ALL, | |
1403 | .nr_to_write = LONG_MAX, | |
1404 | .range_start = range_start, | |
1405 | .range_end = range_end, | |
1406 | }; | |
1407 | int ret = 0; | |
1408 | ||
1409 | BUG_ON(!PageLocked(page)); | |
1410 | for (;;) { | |
1411 | req = nfs_page_find_request(page); | |
1412 | if (req == NULL) | |
1413 | goto out; | |
1414 | if (test_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
1415 | nfs_release_request(req); | |
1416 | break; | |
1417 | } | |
1418 | if (nfs_lock_request_dontget(req)) { | |
1419 | nfs_inode_remove_request(req); | |
1420 | /* | |
1421 | * In case nfs_inode_remove_request has marked the | |
1422 | * page as being dirty | |
1423 | */ | |
1424 | cancel_dirty_page(page, PAGE_CACHE_SIZE); | |
1425 | nfs_unlock_request(req); | |
1426 | break; | |
1427 | } | |
1428 | ret = nfs_wait_on_request(req); | |
1429 | if (ret < 0) | |
1430 | goto out; | |
1431 | } | |
1432 | if (!PagePrivate(page)) | |
1433 | return 0; | |
1434 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, FLUSH_INVALIDATE); | |
1435 | out: | |
1436 | return ret; | |
1437 | } | |
1438 | ||
5334eb13 AB |
1439 | static int nfs_wb_page_priority(struct inode *inode, struct page *page, |
1440 | int how) | |
1c75950b TM |
1441 | { |
1442 | loff_t range_start = page_offset(page); | |
1443 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
4d770ccf TM |
1444 | struct writeback_control wbc = { |
1445 | .bdi = page->mapping->backing_dev_info, | |
1446 | .sync_mode = WB_SYNC_ALL, | |
1447 | .nr_to_write = LONG_MAX, | |
1448 | .range_start = range_start, | |
1449 | .range_end = range_end, | |
1450 | }; | |
1451 | int ret; | |
1c75950b | 1452 | |
4d770ccf | 1453 | BUG_ON(!PageLocked(page)); |
c63c7b05 | 1454 | if (clear_page_dirty_for_io(page)) { |
4d770ccf TM |
1455 | ret = nfs_writepage_locked(page, &wbc); |
1456 | if (ret < 0) | |
1457 | goto out; | |
1458 | } | |
f40313ac TM |
1459 | if (!PagePrivate(page)) |
1460 | return 0; | |
4d770ccf TM |
1461 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); |
1462 | if (ret >= 0) | |
1463 | return 0; | |
1464 | out: | |
e507d9eb | 1465 | __mark_inode_dirty(inode, I_DIRTY_PAGES); |
4d770ccf | 1466 | return ret; |
1c75950b TM |
1467 | } |
1468 | ||
1469 | /* | |
1470 | * Write back all requests on one page - we do this before reading it. | |
1471 | */ | |
1472 | int nfs_wb_page(struct inode *inode, struct page* page) | |
1473 | { | |
4d770ccf | 1474 | return nfs_wb_page_priority(inode, page, FLUSH_STABLE); |
1c75950b TM |
1475 | } |
1476 | ||
f7b422b1 | 1477 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1478 | { |
1479 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1480 | sizeof(struct nfs_write_data), | |
1481 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1482 | NULL); |
1da177e4 LT |
1483 | if (nfs_wdata_cachep == NULL) |
1484 | return -ENOMEM; | |
1485 | ||
93d2341c MD |
1486 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1487 | nfs_wdata_cachep); | |
1da177e4 LT |
1488 | if (nfs_wdata_mempool == NULL) |
1489 | return -ENOMEM; | |
1490 | ||
93d2341c MD |
1491 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1492 | nfs_wdata_cachep); | |
1da177e4 LT |
1493 | if (nfs_commit_mempool == NULL) |
1494 | return -ENOMEM; | |
1495 | ||
89a09141 PZ |
1496 | /* |
1497 | * NFS congestion size, scale with available memory. | |
1498 | * | |
1499 | * 64MB: 8192k | |
1500 | * 128MB: 11585k | |
1501 | * 256MB: 16384k | |
1502 | * 512MB: 23170k | |
1503 | * 1GB: 32768k | |
1504 | * 2GB: 46340k | |
1505 | * 4GB: 65536k | |
1506 | * 8GB: 92681k | |
1507 | * 16GB: 131072k | |
1508 | * | |
1509 | * This allows larger machines to have larger/more transfers. | |
1510 | * Limit the default to 256M | |
1511 | */ | |
1512 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); | |
1513 | if (nfs_congestion_kb > 256*1024) | |
1514 | nfs_congestion_kb = 256*1024; | |
1515 | ||
1da177e4 LT |
1516 | return 0; |
1517 | } | |
1518 | ||
266bee88 | 1519 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1520 | { |
1521 | mempool_destroy(nfs_commit_mempool); | |
1522 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1523 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1524 | } |
1525 |