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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/write.c | |
3 | * | |
4 | * Writing file data over NFS. | |
5 | * | |
6 | * We do it like this: When a (user) process wishes to write data to an | |
7 | * NFS file, a write request is allocated that contains the RPC task data | |
8 | * plus some info on the page to be written, and added to the inode's | |
9 | * write chain. If the process writes past the end of the page, an async | |
10 | * RPC call to write the page is scheduled immediately; otherwise, the call | |
11 | * is delayed for a few seconds. | |
12 | * | |
13 | * Just like readahead, no async I/O is performed if wsize < PAGE_SIZE. | |
14 | * | |
15 | * Write requests are kept on the inode's writeback list. Each entry in | |
16 | * that list references the page (portion) to be written. When the | |
17 | * cache timeout has expired, the RPC task is woken up, and tries to | |
18 | * lock the page. As soon as it manages to do so, the request is moved | |
19 | * from the writeback list to the writelock list. | |
20 | * | |
21 | * Note: we must make sure never to confuse the inode passed in the | |
22 | * write_page request with the one in page->inode. As far as I understand | |
23 | * it, these are different when doing a swap-out. | |
24 | * | |
25 | * To understand everything that goes on here and in the NFS read code, | |
26 | * one should be aware that a page is locked in exactly one of the following | |
27 | * cases: | |
28 | * | |
29 | * - A write request is in progress. | |
30 | * - A user process is in generic_file_write/nfs_update_page | |
31 | * - A user process is in generic_file_read | |
32 | * | |
33 | * Also note that because of the way pages are invalidated in | |
34 | * nfs_revalidate_inode, the following assertions hold: | |
35 | * | |
36 | * - If a page is dirty, there will be no read requests (a page will | |
37 | * not be re-read unless invalidated by nfs_revalidate_inode). | |
38 | * - If the page is not uptodate, there will be no pending write | |
39 | * requests, and no process will be in nfs_update_page. | |
40 | * | |
41 | * FIXME: Interaction with the vmscan routines is not optimal yet. | |
42 | * Either vmscan must be made nfs-savvy, or we need a different page | |
43 | * reclaim concept that supports something like FS-independent | |
44 | * buffer_heads with a b_ops-> field. | |
45 | * | |
46 | * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de> | |
47 | */ | |
48 | ||
1da177e4 LT |
49 | #include <linux/types.h> |
50 | #include <linux/slab.h> | |
51 | #include <linux/mm.h> | |
52 | #include <linux/pagemap.h> | |
53 | #include <linux/file.h> | |
1da177e4 LT |
54 | #include <linux/writeback.h> |
55 | ||
56 | #include <linux/sunrpc/clnt.h> | |
57 | #include <linux/nfs_fs.h> | |
58 | #include <linux/nfs_mount.h> | |
59 | #include <linux/nfs_page.h> | |
3fcfab16 AM |
60 | #include <linux/backing-dev.h> |
61 | ||
1da177e4 LT |
62 | #include <asm/uaccess.h> |
63 | #include <linux/smp_lock.h> | |
64 | ||
65 | #include "delegation.h" | |
49a70f27 | 66 | #include "internal.h" |
91d5b470 | 67 | #include "iostat.h" |
1da177e4 LT |
68 | |
69 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE | |
70 | ||
71 | #define MIN_POOL_WRITE (32) | |
72 | #define MIN_POOL_COMMIT (4) | |
73 | ||
74 | /* | |
75 | * Local function declarations | |
76 | */ | |
77 | static struct nfs_page * nfs_update_request(struct nfs_open_context*, | |
1da177e4 LT |
78 | struct page *, |
79 | unsigned int, unsigned int); | |
1da177e4 LT |
80 | static int nfs_wait_on_write_congestion(struct address_space *, int); |
81 | static int nfs_wait_on_requests(struct inode *, unsigned long, unsigned int); | |
3f442547 | 82 | static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how); |
1c75950b | 83 | static int nfs_wb_page_priority(struct inode *inode, struct page *page, int how); |
788e7a89 TM |
84 | static const struct rpc_call_ops nfs_write_partial_ops; |
85 | static const struct rpc_call_ops nfs_write_full_ops; | |
86 | static const struct rpc_call_ops nfs_commit_ops; | |
1da177e4 LT |
87 | |
88 | static kmem_cache_t *nfs_wdata_cachep; | |
3feb2d49 | 89 | static mempool_t *nfs_wdata_mempool; |
1da177e4 LT |
90 | static mempool_t *nfs_commit_mempool; |
91 | ||
92 | static DECLARE_WAIT_QUEUE_HEAD(nfs_write_congestion); | |
93 | ||
e9f7bee1 | 94 | struct nfs_write_data *nfs_commit_alloc(void) |
1da177e4 LT |
95 | { |
96 | struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, SLAB_NOFS); | |
40859d7e | 97 | |
1da177e4 LT |
98 | if (p) { |
99 | memset(p, 0, sizeof(*p)); | |
100 | INIT_LIST_HEAD(&p->pages); | |
101 | } | |
102 | return p; | |
103 | } | |
104 | ||
8aca67f0 | 105 | void nfs_commit_rcu_free(struct rcu_head *head) |
1da177e4 | 106 | { |
8aca67f0 | 107 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
40859d7e CL |
108 | if (p && (p->pagevec != &p->page_array[0])) |
109 | kfree(p->pagevec); | |
1da177e4 LT |
110 | mempool_free(p, nfs_commit_mempool); |
111 | } | |
112 | ||
8aca67f0 TM |
113 | void nfs_commit_free(struct nfs_write_data *wdata) |
114 | { | |
115 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_commit_rcu_free); | |
116 | } | |
117 | ||
e9f7bee1 | 118 | struct nfs_write_data *nfs_writedata_alloc(size_t len) |
3feb2d49 | 119 | { |
e9f7bee1 | 120 | unsigned int pagecount = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
3feb2d49 TM |
121 | struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, SLAB_NOFS); |
122 | ||
123 | if (p) { | |
124 | memset(p, 0, sizeof(*p)); | |
125 | INIT_LIST_HEAD(&p->pages); | |
e9f7bee1 | 126 | p->npages = pagecount; |
0d0b5cb3 CL |
127 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
128 | p->pagevec = p->page_array; | |
3feb2d49 | 129 | else { |
0d0b5cb3 CL |
130 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
131 | if (!p->pagevec) { | |
3feb2d49 TM |
132 | mempool_free(p, nfs_wdata_mempool); |
133 | p = NULL; | |
134 | } | |
135 | } | |
136 | } | |
137 | return p; | |
138 | } | |
139 | ||
8aca67f0 | 140 | static void nfs_writedata_rcu_free(struct rcu_head *head) |
3feb2d49 | 141 | { |
8aca67f0 | 142 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
3feb2d49 TM |
143 | if (p && (p->pagevec != &p->page_array[0])) |
144 | kfree(p->pagevec); | |
145 | mempool_free(p, nfs_wdata_mempool); | |
146 | } | |
147 | ||
8aca67f0 TM |
148 | static void nfs_writedata_free(struct nfs_write_data *wdata) |
149 | { | |
150 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_writedata_rcu_free); | |
151 | } | |
152 | ||
963d8fe5 | 153 | void nfs_writedata_release(void *wdata) |
1da177e4 | 154 | { |
1da177e4 LT |
155 | nfs_writedata_free(wdata); |
156 | } | |
157 | ||
277459d2 TM |
158 | static struct nfs_page *nfs_page_find_request_locked(struct page *page) |
159 | { | |
160 | struct nfs_page *req = NULL; | |
161 | ||
162 | if (PagePrivate(page)) { | |
163 | req = (struct nfs_page *)page_private(page); | |
164 | if (req != NULL) | |
165 | atomic_inc(&req->wb_count); | |
166 | } | |
167 | return req; | |
168 | } | |
169 | ||
170 | static struct nfs_page *nfs_page_find_request(struct page *page) | |
171 | { | |
172 | struct nfs_page *req = NULL; | |
173 | spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock; | |
174 | ||
175 | spin_lock(req_lock); | |
176 | req = nfs_page_find_request_locked(page); | |
177 | spin_unlock(req_lock); | |
178 | return req; | |
179 | } | |
180 | ||
1da177e4 LT |
181 | /* Adjust the file length if we're writing beyond the end */ |
182 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) | |
183 | { | |
184 | struct inode *inode = page->mapping->host; | |
185 | loff_t end, i_size = i_size_read(inode); | |
186 | unsigned long end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; | |
187 | ||
188 | if (i_size > 0 && page->index < end_index) | |
189 | return; | |
190 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); | |
191 | if (i_size >= end) | |
192 | return; | |
91d5b470 | 193 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
1da177e4 LT |
194 | i_size_write(inode, end); |
195 | } | |
196 | ||
197 | /* We can set the PG_uptodate flag if we see that a write request | |
198 | * covers the full page. | |
199 | */ | |
200 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) | |
201 | { | |
1da177e4 LT |
202 | if (PageUptodate(page)) |
203 | return; | |
204 | if (base != 0) | |
205 | return; | |
49a70f27 | 206 | if (count != nfs_page_length(page)) |
1da177e4 | 207 | return; |
49a70f27 | 208 | if (count != PAGE_CACHE_SIZE) |
1da177e4 | 209 | memclear_highpage_flush(page, count, PAGE_CACHE_SIZE - count); |
49a70f27 | 210 | SetPageUptodate(page); |
1da177e4 LT |
211 | } |
212 | ||
213 | /* | |
214 | * Write a page synchronously. | |
215 | * Offset is the data offset within the page. | |
216 | */ | |
e21195a7 TM |
217 | static int nfs_writepage_sync(struct nfs_open_context *ctx, struct page *page, |
218 | unsigned int offset, unsigned int count, int how) | |
1da177e4 | 219 | { |
e21195a7 | 220 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
221 | unsigned int wsize = NFS_SERVER(inode)->wsize; |
222 | int result, written = 0; | |
223 | struct nfs_write_data *wdata; | |
224 | ||
e9f7bee1 | 225 | wdata = nfs_writedata_alloc(wsize); |
1da177e4 LT |
226 | if (!wdata) |
227 | return -ENOMEM; | |
228 | ||
229 | wdata->flags = how; | |
230 | wdata->cred = ctx->cred; | |
231 | wdata->inode = inode; | |
232 | wdata->args.fh = NFS_FH(inode); | |
233 | wdata->args.context = ctx; | |
234 | wdata->args.pages = &page; | |
235 | wdata->args.stable = NFS_FILE_SYNC; | |
236 | wdata->args.pgbase = offset; | |
237 | wdata->args.count = wsize; | |
238 | wdata->res.fattr = &wdata->fattr; | |
239 | wdata->res.verf = &wdata->verf; | |
240 | ||
241 | dprintk("NFS: nfs_writepage_sync(%s/%Ld %d@%Ld)\n", | |
242 | inode->i_sb->s_id, | |
243 | (long long)NFS_FILEID(inode), | |
244 | count, (long long)(page_offset(page) + offset)); | |
245 | ||
bb713d6d | 246 | set_page_writeback(page); |
1da177e4 LT |
247 | nfs_begin_data_update(inode); |
248 | do { | |
249 | if (count < wsize) | |
250 | wdata->args.count = count; | |
251 | wdata->args.offset = page_offset(page) + wdata->args.pgbase; | |
252 | ||
253 | result = NFS_PROTO(inode)->write(wdata); | |
254 | ||
255 | if (result < 0) { | |
256 | /* Must mark the page invalid after I/O error */ | |
257 | ClearPageUptodate(page); | |
258 | goto io_error; | |
259 | } | |
260 | if (result < wdata->args.count) | |
261 | printk(KERN_WARNING "NFS: short write, count=%u, result=%d\n", | |
262 | wdata->args.count, result); | |
263 | ||
264 | wdata->args.offset += result; | |
265 | wdata->args.pgbase += result; | |
266 | written += result; | |
267 | count -= result; | |
91d5b470 | 268 | nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, result); |
1da177e4 LT |
269 | } while (count); |
270 | /* Update file length */ | |
271 | nfs_grow_file(page, offset, written); | |
272 | /* Set the PG_uptodate flag? */ | |
273 | nfs_mark_uptodate(page, offset, written); | |
274 | ||
275 | if (PageError(page)) | |
276 | ClearPageError(page); | |
277 | ||
278 | io_error: | |
951a143b | 279 | nfs_end_data_update(inode); |
bb713d6d | 280 | end_page_writeback(page); |
8aca67f0 | 281 | nfs_writedata_release(wdata); |
1da177e4 LT |
282 | return written ? written : result; |
283 | } | |
284 | ||
e21195a7 | 285 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
1da177e4 LT |
286 | unsigned int offset, unsigned int count) |
287 | { | |
288 | struct nfs_page *req; | |
e21195a7 | 289 | int ret; |
1da177e4 | 290 | |
e21195a7 TM |
291 | for (;;) { |
292 | req = nfs_update_request(ctx, page, offset, count); | |
293 | if (!IS_ERR(req)) | |
294 | break; | |
295 | ret = PTR_ERR(req); | |
296 | if (ret != -EBUSY) | |
297 | return ret; | |
298 | ret = nfs_wb_page(page->mapping->host, page); | |
299 | if (ret != 0) | |
300 | return ret; | |
301 | } | |
1da177e4 LT |
302 | /* Update file length */ |
303 | nfs_grow_file(page, offset, count); | |
304 | /* Set the PG_uptodate flag? */ | |
305 | nfs_mark_uptodate(page, offset, count); | |
306 | nfs_unlock_request(req); | |
abd3e641 | 307 | return 0; |
1da177e4 LT |
308 | } |
309 | ||
310 | static int wb_priority(struct writeback_control *wbc) | |
311 | { | |
312 | if (wbc->for_reclaim) | |
313 | return FLUSH_HIGHPRI; | |
314 | if (wbc->for_kupdate) | |
315 | return FLUSH_LOWPRI; | |
316 | return 0; | |
317 | } | |
318 | ||
319 | /* | |
320 | * Write an mmapped page to the server. | |
321 | */ | |
322 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
323 | { | |
324 | struct nfs_open_context *ctx; | |
325 | struct inode *inode = page->mapping->host; | |
49a70f27 | 326 | unsigned offset; |
1da177e4 LT |
327 | int err; |
328 | ||
91d5b470 CL |
329 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
330 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
331 | ||
1da177e4 | 332 | /* Ensure we've flushed out any previous writes */ |
e21195a7 | 333 | nfs_wb_page_priority(inode, page, wb_priority(wbc)); |
1da177e4 | 334 | |
49a70f27 TM |
335 | err = 0; |
336 | offset = nfs_page_length(page); | |
337 | if (!offset) | |
1da177e4 | 338 | goto out; |
49a70f27 | 339 | |
d530838b | 340 | ctx = nfs_find_open_context(inode, NULL, FMODE_WRITE); |
1da177e4 LT |
341 | if (ctx == NULL) { |
342 | err = -EBADF; | |
343 | goto out; | |
344 | } | |
345 | lock_kernel(); | |
87a4ce16 | 346 | if (!IS_SYNC(inode)) { |
e21195a7 | 347 | err = nfs_writepage_setup(ctx, page, 0, offset); |
abd3e641 | 348 | if (!wbc->for_writepages) |
28c6925f | 349 | nfs_flush_mapping(page->mapping, wbc, wb_priority(wbc)); |
1da177e4 | 350 | } else { |
e21195a7 | 351 | err = nfs_writepage_sync(ctx, page, 0, offset, wb_priority(wbc)); |
1da177e4 LT |
352 | if (err >= 0) { |
353 | if (err != offset) | |
354 | redirty_page_for_writepage(wbc, page); | |
355 | err = 0; | |
356 | } | |
357 | } | |
358 | unlock_kernel(); | |
359 | put_nfs_open_context(ctx); | |
360 | out: | |
361 | unlock_page(page); | |
1da177e4 LT |
362 | return err; |
363 | } | |
364 | ||
365 | /* | |
366 | * Note: causes nfs_update_request() to block on the assumption | |
367 | * that the writeback is generated due to memory pressure. | |
368 | */ | |
369 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) | |
370 | { | |
371 | struct backing_dev_info *bdi = mapping->backing_dev_info; | |
372 | struct inode *inode = mapping->host; | |
373 | int err; | |
374 | ||
91d5b470 CL |
375 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
376 | ||
1da177e4 LT |
377 | err = generic_writepages(mapping, wbc); |
378 | if (err) | |
379 | return err; | |
380 | while (test_and_set_bit(BDI_write_congested, &bdi->state) != 0) { | |
381 | if (wbc->nonblocking) | |
382 | return 0; | |
383 | nfs_wait_on_write_congestion(mapping, 0); | |
384 | } | |
28c6925f | 385 | err = nfs_flush_mapping(mapping, wbc, wb_priority(wbc)); |
1da177e4 LT |
386 | if (err < 0) |
387 | goto out; | |
91d5b470 | 388 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, err); |
1da177e4 LT |
389 | if (!wbc->nonblocking && wbc->sync_mode == WB_SYNC_ALL) { |
390 | err = nfs_wait_on_requests(inode, 0, 0); | |
391 | if (err < 0) | |
392 | goto out; | |
393 | } | |
3da28eb1 | 394 | err = nfs_commit_inode(inode, wb_priority(wbc)); |
3f442547 | 395 | if (err > 0) |
1da177e4 | 396 | err = 0; |
1da177e4 LT |
397 | out: |
398 | clear_bit(BDI_write_congested, &bdi->state); | |
399 | wake_up_all(&nfs_write_congestion); | |
3fcfab16 | 400 | congestion_end(WRITE); |
1da177e4 LT |
401 | return err; |
402 | } | |
403 | ||
404 | /* | |
405 | * Insert a write request into an inode | |
406 | */ | |
407 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) | |
408 | { | |
409 | struct nfs_inode *nfsi = NFS_I(inode); | |
410 | int error; | |
411 | ||
412 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); | |
413 | BUG_ON(error == -EEXIST); | |
414 | if (error) | |
415 | return error; | |
416 | if (!nfsi->npages) { | |
417 | igrab(inode); | |
418 | nfs_begin_data_update(inode); | |
419 | if (nfs_have_delegation(inode, FMODE_WRITE)) | |
420 | nfsi->change_attr++; | |
421 | } | |
deb7d638 | 422 | SetPagePrivate(req->wb_page); |
277459d2 | 423 | set_page_private(req->wb_page, (unsigned long)req); |
1da177e4 LT |
424 | nfsi->npages++; |
425 | atomic_inc(&req->wb_count); | |
426 | return 0; | |
427 | } | |
428 | ||
429 | /* | |
430 | * Insert a write request into an inode | |
431 | */ | |
432 | static void nfs_inode_remove_request(struct nfs_page *req) | |
433 | { | |
434 | struct inode *inode = req->wb_context->dentry->d_inode; | |
435 | struct nfs_inode *nfsi = NFS_I(inode); | |
436 | ||
437 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
438 | ||
439 | spin_lock(&nfsi->req_lock); | |
277459d2 | 440 | set_page_private(req->wb_page, 0); |
deb7d638 | 441 | ClearPagePrivate(req->wb_page); |
1da177e4 LT |
442 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
443 | nfsi->npages--; | |
444 | if (!nfsi->npages) { | |
445 | spin_unlock(&nfsi->req_lock); | |
951a143b | 446 | nfs_end_data_update(inode); |
1da177e4 LT |
447 | iput(inode); |
448 | } else | |
449 | spin_unlock(&nfsi->req_lock); | |
450 | nfs_clear_request(req); | |
451 | nfs_release_request(req); | |
452 | } | |
453 | ||
1da177e4 LT |
454 | /* |
455 | * Add a request to the inode's dirty list. | |
456 | */ | |
457 | static void | |
458 | nfs_mark_request_dirty(struct nfs_page *req) | |
459 | { | |
460 | struct inode *inode = req->wb_context->dentry->d_inode; | |
461 | struct nfs_inode *nfsi = NFS_I(inode); | |
462 | ||
463 | spin_lock(&nfsi->req_lock); | |
3da28eb1 TM |
464 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
465 | req->wb_index, NFS_PAGE_TAG_DIRTY); | |
1da177e4 LT |
466 | nfs_list_add_request(req, &nfsi->dirty); |
467 | nfsi->ndirty++; | |
468 | spin_unlock(&nfsi->req_lock); | |
b1e7a8fd | 469 | inc_zone_page_state(req->wb_page, NR_FILE_DIRTY); |
1da177e4 LT |
470 | mark_inode_dirty(inode); |
471 | } | |
472 | ||
473 | /* | |
474 | * Check if a request is dirty | |
475 | */ | |
476 | static inline int | |
477 | nfs_dirty_request(struct nfs_page *req) | |
478 | { | |
479 | struct nfs_inode *nfsi = NFS_I(req->wb_context->dentry->d_inode); | |
480 | return !list_empty(&req->wb_list) && req->wb_list_head == &nfsi->dirty; | |
481 | } | |
482 | ||
483 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
484 | /* | |
485 | * Add a request to the inode's commit list. | |
486 | */ | |
487 | static void | |
488 | nfs_mark_request_commit(struct nfs_page *req) | |
489 | { | |
490 | struct inode *inode = req->wb_context->dentry->d_inode; | |
491 | struct nfs_inode *nfsi = NFS_I(inode); | |
492 | ||
493 | spin_lock(&nfsi->req_lock); | |
494 | nfs_list_add_request(req, &nfsi->commit); | |
495 | nfsi->ncommit++; | |
496 | spin_unlock(&nfsi->req_lock); | |
fd39fc85 | 497 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
1da177e4 LT |
498 | mark_inode_dirty(inode); |
499 | } | |
500 | #endif | |
501 | ||
502 | /* | |
503 | * Wait for a request to complete. | |
504 | * | |
505 | * Interruptible by signals only if mounted with intr flag. | |
506 | */ | |
c42de9dd | 507 | static int nfs_wait_on_requests_locked(struct inode *inode, unsigned long idx_start, unsigned int npages) |
1da177e4 LT |
508 | { |
509 | struct nfs_inode *nfsi = NFS_I(inode); | |
510 | struct nfs_page *req; | |
511 | unsigned long idx_end, next; | |
512 | unsigned int res = 0; | |
513 | int error; | |
514 | ||
515 | if (npages == 0) | |
516 | idx_end = ~0; | |
517 | else | |
518 | idx_end = idx_start + npages - 1; | |
519 | ||
1da177e4 | 520 | next = idx_start; |
c6a556b8 | 521 | while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_WRITEBACK)) { |
1da177e4 LT |
522 | if (req->wb_index > idx_end) |
523 | break; | |
524 | ||
525 | next = req->wb_index + 1; | |
c6a556b8 | 526 | BUG_ON(!NFS_WBACK_BUSY(req)); |
1da177e4 LT |
527 | |
528 | atomic_inc(&req->wb_count); | |
529 | spin_unlock(&nfsi->req_lock); | |
530 | error = nfs_wait_on_request(req); | |
531 | nfs_release_request(req); | |
c42de9dd | 532 | spin_lock(&nfsi->req_lock); |
1da177e4 LT |
533 | if (error < 0) |
534 | return error; | |
1da177e4 LT |
535 | res++; |
536 | } | |
1da177e4 LT |
537 | return res; |
538 | } | |
539 | ||
c42de9dd TM |
540 | static int nfs_wait_on_requests(struct inode *inode, unsigned long idx_start, unsigned int npages) |
541 | { | |
542 | struct nfs_inode *nfsi = NFS_I(inode); | |
543 | int ret; | |
544 | ||
545 | spin_lock(&nfsi->req_lock); | |
546 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); | |
547 | spin_unlock(&nfsi->req_lock); | |
548 | return ret; | |
549 | } | |
550 | ||
83715ad5 | 551 | static void nfs_cancel_dirty_list(struct list_head *head) |
d2ccddf0 TM |
552 | { |
553 | struct nfs_page *req; | |
554 | while(!list_empty(head)) { | |
555 | req = nfs_list_entry(head->next); | |
556 | nfs_list_remove_request(req); | |
557 | nfs_inode_remove_request(req); | |
558 | nfs_clear_page_writeback(req); | |
559 | } | |
560 | } | |
561 | ||
83715ad5 TM |
562 | static void nfs_cancel_commit_list(struct list_head *head) |
563 | { | |
564 | struct nfs_page *req; | |
565 | ||
566 | while(!list_empty(head)) { | |
567 | req = nfs_list_entry(head->next); | |
b6dff26a | 568 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
83715ad5 TM |
569 | nfs_list_remove_request(req); |
570 | nfs_inode_remove_request(req); | |
b6dff26a | 571 | nfs_unlock_request(req); |
83715ad5 TM |
572 | } |
573 | } | |
574 | ||
1da177e4 LT |
575 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
576 | /* | |
577 | * nfs_scan_commit - Scan an inode for commit requests | |
578 | * @inode: NFS inode to scan | |
579 | * @dst: destination list | |
580 | * @idx_start: lower bound of page->index to scan. | |
581 | * @npages: idx_start + npages sets the upper bound to scan. | |
582 | * | |
583 | * Moves requests from the inode's 'commit' request list. | |
584 | * The requests are *not* checked to ensure that they form a contiguous set. | |
585 | */ | |
586 | static int | |
587 | nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
588 | { | |
589 | struct nfs_inode *nfsi = NFS_I(inode); | |
3da28eb1 TM |
590 | int res = 0; |
591 | ||
592 | if (nfsi->ncommit != 0) { | |
d2ccddf0 | 593 | res = nfs_scan_list(nfsi, &nfsi->commit, dst, idx_start, npages); |
3da28eb1 TM |
594 | nfsi->ncommit -= res; |
595 | if ((nfsi->ncommit == 0) != list_empty(&nfsi->commit)) | |
596 | printk(KERN_ERR "NFS: desynchronized value of nfs_i.ncommit.\n"); | |
597 | } | |
1da177e4 LT |
598 | return res; |
599 | } | |
c42de9dd TM |
600 | #else |
601 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
602 | { | |
603 | return 0; | |
604 | } | |
1da177e4 LT |
605 | #endif |
606 | ||
607 | static int nfs_wait_on_write_congestion(struct address_space *mapping, int intr) | |
608 | { | |
609 | struct backing_dev_info *bdi = mapping->backing_dev_info; | |
610 | DEFINE_WAIT(wait); | |
611 | int ret = 0; | |
612 | ||
613 | might_sleep(); | |
614 | ||
615 | if (!bdi_write_congested(bdi)) | |
616 | return 0; | |
91d5b470 CL |
617 | |
618 | nfs_inc_stats(mapping->host, NFSIOS_CONGESTIONWAIT); | |
619 | ||
1da177e4 LT |
620 | if (intr) { |
621 | struct rpc_clnt *clnt = NFS_CLIENT(mapping->host); | |
622 | sigset_t oldset; | |
623 | ||
624 | rpc_clnt_sigmask(clnt, &oldset); | |
625 | prepare_to_wait(&nfs_write_congestion, &wait, TASK_INTERRUPTIBLE); | |
626 | if (bdi_write_congested(bdi)) { | |
627 | if (signalled()) | |
628 | ret = -ERESTARTSYS; | |
629 | else | |
630 | schedule(); | |
631 | } | |
632 | rpc_clnt_sigunmask(clnt, &oldset); | |
633 | } else { | |
634 | prepare_to_wait(&nfs_write_congestion, &wait, TASK_UNINTERRUPTIBLE); | |
635 | if (bdi_write_congested(bdi)) | |
636 | schedule(); | |
637 | } | |
638 | finish_wait(&nfs_write_congestion, &wait); | |
639 | return ret; | |
640 | } | |
641 | ||
642 | ||
643 | /* | |
644 | * Try to update any existing write request, or create one if there is none. | |
645 | * In order to match, the request's credentials must match those of | |
646 | * the calling process. | |
647 | * | |
648 | * Note: Should always be called with the Page Lock held! | |
649 | */ | |
650 | static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, | |
e21195a7 | 651 | struct page *page, unsigned int offset, unsigned int bytes) |
1da177e4 | 652 | { |
e21195a7 | 653 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
654 | struct nfs_inode *nfsi = NFS_I(inode); |
655 | struct nfs_page *req, *new = NULL; | |
656 | unsigned long rqend, end; | |
657 | ||
658 | end = offset + bytes; | |
659 | ||
e21195a7 | 660 | if (nfs_wait_on_write_congestion(page->mapping, NFS_SERVER(inode)->flags & NFS_MOUNT_INTR)) |
1da177e4 LT |
661 | return ERR_PTR(-ERESTARTSYS); |
662 | for (;;) { | |
663 | /* Loop over all inode entries and see if we find | |
664 | * A request for the page we wish to update | |
665 | */ | |
666 | spin_lock(&nfsi->req_lock); | |
277459d2 | 667 | req = nfs_page_find_request_locked(page); |
1da177e4 LT |
668 | if (req) { |
669 | if (!nfs_lock_request_dontget(req)) { | |
670 | int error; | |
277459d2 | 671 | |
1da177e4 LT |
672 | spin_unlock(&nfsi->req_lock); |
673 | error = nfs_wait_on_request(req); | |
674 | nfs_release_request(req); | |
1dd594b2 NB |
675 | if (error < 0) { |
676 | if (new) | |
677 | nfs_release_request(new); | |
1da177e4 | 678 | return ERR_PTR(error); |
1dd594b2 | 679 | } |
1da177e4 LT |
680 | continue; |
681 | } | |
682 | spin_unlock(&nfsi->req_lock); | |
683 | if (new) | |
684 | nfs_release_request(new); | |
685 | break; | |
686 | } | |
687 | ||
688 | if (new) { | |
689 | int error; | |
690 | nfs_lock_request_dontget(new); | |
691 | error = nfs_inode_add_request(inode, new); | |
692 | if (error) { | |
693 | spin_unlock(&nfsi->req_lock); | |
694 | nfs_unlock_request(new); | |
695 | return ERR_PTR(error); | |
696 | } | |
697 | spin_unlock(&nfsi->req_lock); | |
698 | nfs_mark_request_dirty(new); | |
699 | return new; | |
700 | } | |
701 | spin_unlock(&nfsi->req_lock); | |
702 | ||
703 | new = nfs_create_request(ctx, inode, page, offset, bytes); | |
704 | if (IS_ERR(new)) | |
705 | return new; | |
706 | } | |
707 | ||
708 | /* We have a request for our page. | |
709 | * If the creds don't match, or the | |
710 | * page addresses don't match, | |
711 | * tell the caller to wait on the conflicting | |
712 | * request. | |
713 | */ | |
714 | rqend = req->wb_offset + req->wb_bytes; | |
715 | if (req->wb_context != ctx | |
716 | || req->wb_page != page | |
717 | || !nfs_dirty_request(req) | |
718 | || offset > rqend || end < req->wb_offset) { | |
719 | nfs_unlock_request(req); | |
720 | return ERR_PTR(-EBUSY); | |
721 | } | |
722 | ||
723 | /* Okay, the request matches. Update the region */ | |
724 | if (offset < req->wb_offset) { | |
725 | req->wb_offset = offset; | |
726 | req->wb_pgbase = offset; | |
727 | req->wb_bytes = rqend - req->wb_offset; | |
728 | } | |
729 | ||
730 | if (end > rqend) | |
731 | req->wb_bytes = end - req->wb_offset; | |
732 | ||
733 | return req; | |
734 | } | |
735 | ||
736 | int nfs_flush_incompatible(struct file *file, struct page *page) | |
737 | { | |
738 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 LT |
739 | struct nfs_page *req; |
740 | int status = 0; | |
741 | /* | |
742 | * Look for a request corresponding to this page. If there | |
743 | * is one, and it belongs to another file, we flush it out | |
744 | * before we try to copy anything into the page. Do this | |
745 | * due to the lack of an ACCESS-type call in NFSv2. | |
746 | * Also do the same if we find a request from an existing | |
747 | * dropped page. | |
748 | */ | |
277459d2 TM |
749 | req = nfs_page_find_request(page); |
750 | if (req != NULL) { | |
751 | int do_flush = req->wb_page != page || req->wb_context != ctx; | |
752 | ||
1da177e4 | 753 | nfs_release_request(req); |
277459d2 TM |
754 | if (do_flush) |
755 | status = nfs_wb_page(page->mapping->host, page); | |
1da177e4 LT |
756 | } |
757 | return (status < 0) ? status : 0; | |
758 | } | |
759 | ||
760 | /* | |
761 | * Update and possibly write a cached page of an NFS file. | |
762 | * | |
763 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
764 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
765 | */ | |
766 | int nfs_updatepage(struct file *file, struct page *page, | |
767 | unsigned int offset, unsigned int count) | |
768 | { | |
769 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 | 770 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
771 | int status = 0; |
772 | ||
91d5b470 CL |
773 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
774 | ||
1da177e4 | 775 | dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", |
0bbacc40 CL |
776 | file->f_dentry->d_parent->d_name.name, |
777 | file->f_dentry->d_name.name, count, | |
778 | (long long)(page_offset(page) +offset)); | |
1da177e4 LT |
779 | |
780 | if (IS_SYNC(inode)) { | |
e21195a7 | 781 | status = nfs_writepage_sync(ctx, page, offset, count, 0); |
1da177e4 LT |
782 | if (status > 0) { |
783 | if (offset == 0 && status == PAGE_CACHE_SIZE) | |
784 | SetPageUptodate(page); | |
785 | return 0; | |
786 | } | |
787 | return status; | |
788 | } | |
789 | ||
790 | /* If we're not using byte range locks, and we know the page | |
791 | * is entirely in cache, it may be more efficient to avoid | |
792 | * fragmenting write requests. | |
793 | */ | |
ab0a3dbe | 794 | if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) { |
49a70f27 | 795 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 796 | offset = 0; |
1da177e4 LT |
797 | } |
798 | ||
e21195a7 | 799 | status = nfs_writepage_setup(ctx, page, offset, count); |
1da177e4 | 800 | |
1da177e4 LT |
801 | dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", |
802 | status, (long long)i_size_read(inode)); | |
803 | if (status < 0) | |
804 | ClearPageUptodate(page); | |
805 | return status; | |
806 | } | |
807 | ||
808 | static void nfs_writepage_release(struct nfs_page *req) | |
809 | { | |
810 | end_page_writeback(req->wb_page); | |
811 | ||
812 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
813 | if (!PageError(req->wb_page)) { | |
814 | if (NFS_NEED_RESCHED(req)) { | |
815 | nfs_mark_request_dirty(req); | |
816 | goto out; | |
817 | } else if (NFS_NEED_COMMIT(req)) { | |
818 | nfs_mark_request_commit(req); | |
819 | goto out; | |
820 | } | |
821 | } | |
822 | nfs_inode_remove_request(req); | |
823 | ||
824 | out: | |
825 | nfs_clear_commit(req); | |
826 | nfs_clear_reschedule(req); | |
827 | #else | |
828 | nfs_inode_remove_request(req); | |
829 | #endif | |
c6a556b8 | 830 | nfs_clear_page_writeback(req); |
1da177e4 LT |
831 | } |
832 | ||
833 | static inline int flush_task_priority(int how) | |
834 | { | |
835 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
836 | case FLUSH_HIGHPRI: | |
837 | return RPC_PRIORITY_HIGH; | |
838 | case FLUSH_LOWPRI: | |
839 | return RPC_PRIORITY_LOW; | |
840 | } | |
841 | return RPC_PRIORITY_NORMAL; | |
842 | } | |
843 | ||
844 | /* | |
845 | * Set up the argument/result storage required for the RPC call. | |
846 | */ | |
847 | static void nfs_write_rpcsetup(struct nfs_page *req, | |
848 | struct nfs_write_data *data, | |
788e7a89 | 849 | const struct rpc_call_ops *call_ops, |
1da177e4 LT |
850 | unsigned int count, unsigned int offset, |
851 | int how) | |
852 | { | |
1da177e4 | 853 | struct inode *inode; |
788e7a89 | 854 | int flags; |
1da177e4 LT |
855 | |
856 | /* Set up the RPC argument and reply structs | |
857 | * NB: take care not to mess about with data->commit et al. */ | |
858 | ||
859 | data->req = req; | |
860 | data->inode = inode = req->wb_context->dentry->d_inode; | |
861 | data->cred = req->wb_context->cred; | |
862 | ||
863 | data->args.fh = NFS_FH(inode); | |
864 | data->args.offset = req_offset(req) + offset; | |
865 | data->args.pgbase = req->wb_pgbase + offset; | |
866 | data->args.pages = data->pagevec; | |
867 | data->args.count = count; | |
868 | data->args.context = req->wb_context; | |
869 | ||
870 | data->res.fattr = &data->fattr; | |
871 | data->res.count = count; | |
872 | data->res.verf = &data->verf; | |
0e574af1 | 873 | nfs_fattr_init(&data->fattr); |
1da177e4 | 874 | |
788e7a89 TM |
875 | /* Set up the initial task struct. */ |
876 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
877 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data); | |
1da177e4 LT |
878 | NFS_PROTO(inode)->write_setup(data, how); |
879 | ||
880 | data->task.tk_priority = flush_task_priority(how); | |
881 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 LT |
882 | |
883 | dprintk("NFS: %4d initiated write call (req %s/%Ld, %u bytes @ offset %Lu)\n", | |
0bbacc40 | 884 | data->task.tk_pid, |
1da177e4 LT |
885 | inode->i_sb->s_id, |
886 | (long long)NFS_FILEID(inode), | |
887 | count, | |
888 | (unsigned long long)data->args.offset); | |
889 | } | |
890 | ||
891 | static void nfs_execute_write(struct nfs_write_data *data) | |
892 | { | |
893 | struct rpc_clnt *clnt = NFS_CLIENT(data->inode); | |
894 | sigset_t oldset; | |
895 | ||
896 | rpc_clnt_sigmask(clnt, &oldset); | |
1da177e4 | 897 | rpc_execute(&data->task); |
1da177e4 LT |
898 | rpc_clnt_sigunmask(clnt, &oldset); |
899 | } | |
900 | ||
901 | /* | |
902 | * Generate multiple small requests to write out a single | |
903 | * contiguous dirty area on one page. | |
904 | */ | |
7d46a49f | 905 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
906 | { |
907 | struct nfs_page *req = nfs_list_entry(head->next); | |
908 | struct page *page = req->wb_page; | |
909 | struct nfs_write_data *data; | |
e9f7bee1 TM |
910 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
911 | unsigned int offset; | |
1da177e4 LT |
912 | int requests = 0; |
913 | LIST_HEAD(list); | |
914 | ||
915 | nfs_list_remove_request(req); | |
916 | ||
917 | nbytes = req->wb_bytes; | |
e9f7bee1 TM |
918 | do { |
919 | size_t len = min(nbytes, wsize); | |
920 | ||
921 | data = nfs_writedata_alloc(len); | |
1da177e4 LT |
922 | if (!data) |
923 | goto out_bad; | |
924 | list_add(&data->pages, &list); | |
925 | requests++; | |
e9f7bee1 TM |
926 | nbytes -= len; |
927 | } while (nbytes != 0); | |
1da177e4 LT |
928 | atomic_set(&req->wb_complete, requests); |
929 | ||
930 | ClearPageError(page); | |
bb713d6d | 931 | set_page_writeback(page); |
1da177e4 LT |
932 | offset = 0; |
933 | nbytes = req->wb_bytes; | |
934 | do { | |
935 | data = list_entry(list.next, struct nfs_write_data, pages); | |
936 | list_del_init(&data->pages); | |
937 | ||
938 | data->pagevec[0] = page; | |
1da177e4 LT |
939 | |
940 | if (nbytes > wsize) { | |
788e7a89 TM |
941 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
942 | wsize, offset, how); | |
1da177e4 LT |
943 | offset += wsize; |
944 | nbytes -= wsize; | |
945 | } else { | |
788e7a89 TM |
946 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
947 | nbytes, offset, how); | |
1da177e4 LT |
948 | nbytes = 0; |
949 | } | |
950 | nfs_execute_write(data); | |
951 | } while (nbytes != 0); | |
952 | ||
953 | return 0; | |
954 | ||
955 | out_bad: | |
956 | while (!list_empty(&list)) { | |
957 | data = list_entry(list.next, struct nfs_write_data, pages); | |
958 | list_del(&data->pages); | |
8aca67f0 | 959 | nfs_writedata_release(data); |
1da177e4 LT |
960 | } |
961 | nfs_mark_request_dirty(req); | |
c6a556b8 | 962 | nfs_clear_page_writeback(req); |
1da177e4 LT |
963 | return -ENOMEM; |
964 | } | |
965 | ||
966 | /* | |
967 | * Create an RPC task for the given write request and kick it. | |
968 | * The page must have been locked by the caller. | |
969 | * | |
970 | * It may happen that the page we're passed is not marked dirty. | |
971 | * This is the case if nfs_updatepage detects a conflicting request | |
972 | * that has been written but not committed. | |
973 | */ | |
7d46a49f | 974 | static int nfs_flush_one(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
975 | { |
976 | struct nfs_page *req; | |
977 | struct page **pages; | |
978 | struct nfs_write_data *data; | |
979 | unsigned int count; | |
980 | ||
e9f7bee1 | 981 | data = nfs_writedata_alloc(NFS_SERVER(inode)->wsize); |
1da177e4 LT |
982 | if (!data) |
983 | goto out_bad; | |
984 | ||
985 | pages = data->pagevec; | |
986 | count = 0; | |
987 | while (!list_empty(head)) { | |
988 | req = nfs_list_entry(head->next); | |
989 | nfs_list_remove_request(req); | |
990 | nfs_list_add_request(req, &data->pages); | |
991 | ClearPageError(req->wb_page); | |
bb713d6d | 992 | set_page_writeback(req->wb_page); |
1da177e4 LT |
993 | *pages++ = req->wb_page; |
994 | count += req->wb_bytes; | |
995 | } | |
996 | req = nfs_list_entry(data->pages.next); | |
997 | ||
1da177e4 | 998 | /* Set up the argument struct */ |
788e7a89 | 999 | nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 LT |
1000 | |
1001 | nfs_execute_write(data); | |
1002 | return 0; | |
1003 | out_bad: | |
1004 | while (!list_empty(head)) { | |
1005 | struct nfs_page *req = nfs_list_entry(head->next); | |
1006 | nfs_list_remove_request(req); | |
1007 | nfs_mark_request_dirty(req); | |
c6a556b8 | 1008 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1009 | } |
1010 | return -ENOMEM; | |
1011 | } | |
1012 | ||
7d46a49f | 1013 | static int nfs_flush_list(struct inode *inode, struct list_head *head, int npages, int how) |
1da177e4 LT |
1014 | { |
1015 | LIST_HEAD(one_request); | |
7d46a49f TM |
1016 | int (*flush_one)(struct inode *, struct list_head *, int); |
1017 | struct nfs_page *req; | |
1018 | int wpages = NFS_SERVER(inode)->wpages; | |
1019 | int wsize = NFS_SERVER(inode)->wsize; | |
1020 | int error; | |
1da177e4 | 1021 | |
7d46a49f TM |
1022 | flush_one = nfs_flush_one; |
1023 | if (wsize < PAGE_CACHE_SIZE) | |
1024 | flush_one = nfs_flush_multi; | |
1025 | /* For single writes, FLUSH_STABLE is more efficient */ | |
1026 | if (npages <= wpages && npages == NFS_I(inode)->npages | |
1027 | && nfs_list_entry(head->next)->wb_bytes <= wsize) | |
1028 | how |= FLUSH_STABLE; | |
1029 | ||
1030 | do { | |
1031 | nfs_coalesce_requests(head, &one_request, wpages); | |
1da177e4 | 1032 | req = nfs_list_entry(one_request.next); |
7d46a49f | 1033 | error = flush_one(inode, &one_request, how); |
1da177e4 | 1034 | if (error < 0) |
7d46a49f TM |
1035 | goto out_err; |
1036 | } while (!list_empty(head)); | |
1037 | return 0; | |
1038 | out_err: | |
1da177e4 LT |
1039 | while (!list_empty(head)) { |
1040 | req = nfs_list_entry(head->next); | |
1041 | nfs_list_remove_request(req); | |
1042 | nfs_mark_request_dirty(req); | |
c6a556b8 | 1043 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1044 | } |
1045 | return error; | |
1046 | } | |
1047 | ||
1048 | /* | |
1049 | * Handle a write reply that flushed part of a page. | |
1050 | */ | |
788e7a89 | 1051 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 1052 | { |
788e7a89 | 1053 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
1054 | struct nfs_page *req = data->req; |
1055 | struct page *page = req->wb_page; | |
1056 | ||
1057 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
1058 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1059 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1060 | req->wb_bytes, | |
1061 | (long long)req_offset(req)); | |
1062 | ||
788e7a89 TM |
1063 | if (nfs_writeback_done(task, data) != 0) |
1064 | return; | |
1065 | ||
1066 | if (task->tk_status < 0) { | |
1da177e4 LT |
1067 | ClearPageUptodate(page); |
1068 | SetPageError(page); | |
788e7a89 TM |
1069 | req->wb_context->error = task->tk_status; |
1070 | dprintk(", error = %d\n", task->tk_status); | |
1da177e4 LT |
1071 | } else { |
1072 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
1073 | if (data->verf.committed < NFS_FILE_SYNC) { | |
1074 | if (!NFS_NEED_COMMIT(req)) { | |
1075 | nfs_defer_commit(req); | |
1076 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1077 | dprintk(" defer commit\n"); | |
1078 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
1079 | nfs_defer_reschedule(req); | |
1080 | dprintk(" server reboot detected\n"); | |
1081 | } | |
1082 | } else | |
1083 | #endif | |
1084 | dprintk(" OK\n"); | |
1085 | } | |
1086 | ||
1087 | if (atomic_dec_and_test(&req->wb_complete)) | |
1088 | nfs_writepage_release(req); | |
1089 | } | |
1090 | ||
788e7a89 TM |
1091 | static const struct rpc_call_ops nfs_write_partial_ops = { |
1092 | .rpc_call_done = nfs_writeback_done_partial, | |
1093 | .rpc_release = nfs_writedata_release, | |
1094 | }; | |
1095 | ||
1da177e4 LT |
1096 | /* |
1097 | * Handle a write reply that flushes a whole page. | |
1098 | * | |
1099 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
1100 | * writebacks since the page->count is kept > 1 for as long | |
1101 | * as the page has a write request pending. | |
1102 | */ | |
788e7a89 | 1103 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 1104 | { |
788e7a89 | 1105 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
1106 | struct nfs_page *req; |
1107 | struct page *page; | |
1108 | ||
788e7a89 TM |
1109 | if (nfs_writeback_done(task, data) != 0) |
1110 | return; | |
1111 | ||
1da177e4 LT |
1112 | /* Update attributes as result of writeback. */ |
1113 | while (!list_empty(&data->pages)) { | |
1114 | req = nfs_list_entry(data->pages.next); | |
1115 | nfs_list_remove_request(req); | |
1116 | page = req->wb_page; | |
1117 | ||
1118 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
1119 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1120 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1121 | req->wb_bytes, | |
1122 | (long long)req_offset(req)); | |
1123 | ||
788e7a89 | 1124 | if (task->tk_status < 0) { |
1da177e4 LT |
1125 | ClearPageUptodate(page); |
1126 | SetPageError(page); | |
788e7a89 | 1127 | req->wb_context->error = task->tk_status; |
1da177e4 LT |
1128 | end_page_writeback(page); |
1129 | nfs_inode_remove_request(req); | |
788e7a89 | 1130 | dprintk(", error = %d\n", task->tk_status); |
1da177e4 LT |
1131 | goto next; |
1132 | } | |
1133 | end_page_writeback(page); | |
1134 | ||
1135 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
1136 | if (data->args.stable != NFS_UNSTABLE || data->verf.committed == NFS_FILE_SYNC) { | |
1137 | nfs_inode_remove_request(req); | |
1138 | dprintk(" OK\n"); | |
1139 | goto next; | |
1140 | } | |
1141 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1142 | nfs_mark_request_commit(req); | |
1143 | dprintk(" marked for commit\n"); | |
1144 | #else | |
1145 | nfs_inode_remove_request(req); | |
1146 | #endif | |
1147 | next: | |
c6a556b8 | 1148 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1149 | } |
1150 | } | |
1151 | ||
788e7a89 TM |
1152 | static const struct rpc_call_ops nfs_write_full_ops = { |
1153 | .rpc_call_done = nfs_writeback_done_full, | |
1154 | .rpc_release = nfs_writedata_release, | |
1155 | }; | |
1156 | ||
1157 | ||
1da177e4 LT |
1158 | /* |
1159 | * This function is called when the WRITE call is complete. | |
1160 | */ | |
462d5b32 | 1161 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1162 | { |
1da177e4 LT |
1163 | struct nfs_writeargs *argp = &data->args; |
1164 | struct nfs_writeres *resp = &data->res; | |
788e7a89 | 1165 | int status; |
1da177e4 LT |
1166 | |
1167 | dprintk("NFS: %4d nfs_writeback_done (status %d)\n", | |
1168 | task->tk_pid, task->tk_status); | |
1169 | ||
f551e44f CL |
1170 | /* |
1171 | * ->write_done will attempt to use post-op attributes to detect | |
1172 | * conflicting writes by other clients. A strict interpretation | |
1173 | * of close-to-open would allow us to continue caching even if | |
1174 | * another writer had changed the file, but some applications | |
1175 | * depend on tighter cache coherency when writing. | |
1176 | */ | |
788e7a89 TM |
1177 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1178 | if (status != 0) | |
1179 | return status; | |
91d5b470 CL |
1180 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1181 | ||
1da177e4 LT |
1182 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1183 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1184 | /* We tried a write call, but the server did not | |
1185 | * commit data to stable storage even though we | |
1186 | * requested it. | |
1187 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1188 | * the server reports NFS_DATA_SYNC, but performs | |
1189 | * NFS_FILE_SYNC. We therefore implement this checking | |
1190 | * as a dprintk() in order to avoid filling syslog. | |
1191 | */ | |
1192 | static unsigned long complain; | |
1193 | ||
1194 | if (time_before(complain, jiffies)) { | |
1195 | dprintk("NFS: faulty NFS server %s:" | |
1196 | " (committed = %d) != (stable = %d)\n", | |
54ceac45 | 1197 | NFS_SERVER(data->inode)->nfs_client->cl_hostname, |
1da177e4 LT |
1198 | resp->verf->committed, argp->stable); |
1199 | complain = jiffies + 300 * HZ; | |
1200 | } | |
1201 | } | |
1202 | #endif | |
1203 | /* Is this a short write? */ | |
1204 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1205 | static unsigned long complain; | |
1206 | ||
91d5b470 CL |
1207 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1208 | ||
1da177e4 LT |
1209 | /* Has the server at least made some progress? */ |
1210 | if (resp->count != 0) { | |
1211 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1212 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1213 | /* Resend from where the server left off */ | |
1214 | argp->offset += resp->count; | |
1215 | argp->pgbase += resp->count; | |
1216 | argp->count -= resp->count; | |
1217 | } else { | |
1218 | /* Resend as a stable write in order to avoid | |
1219 | * headaches in the case of a server crash. | |
1220 | */ | |
1221 | argp->stable = NFS_FILE_SYNC; | |
1222 | } | |
1223 | rpc_restart_call(task); | |
788e7a89 | 1224 | return -EAGAIN; |
1da177e4 LT |
1225 | } |
1226 | if (time_before(complain, jiffies)) { | |
1227 | printk(KERN_WARNING | |
1228 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1229 | argp->count); | |
1230 | complain = jiffies + 300 * HZ; | |
1231 | } | |
1232 | /* Can't do anything about it except throw an error. */ | |
1233 | task->tk_status = -EIO; | |
1234 | } | |
788e7a89 | 1235 | return 0; |
1da177e4 LT |
1236 | } |
1237 | ||
1238 | ||
1239 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
963d8fe5 | 1240 | void nfs_commit_release(void *wdata) |
1da177e4 | 1241 | { |
1da177e4 LT |
1242 | nfs_commit_free(wdata); |
1243 | } | |
1244 | ||
1245 | /* | |
1246 | * Set up the argument/result storage required for the RPC call. | |
1247 | */ | |
1248 | static void nfs_commit_rpcsetup(struct list_head *head, | |
788e7a89 TM |
1249 | struct nfs_write_data *data, |
1250 | int how) | |
1da177e4 | 1251 | { |
3da28eb1 | 1252 | struct nfs_page *first; |
1da177e4 | 1253 | struct inode *inode; |
788e7a89 | 1254 | int flags; |
1da177e4 LT |
1255 | |
1256 | /* Set up the RPC argument and reply structs | |
1257 | * NB: take care not to mess about with data->commit et al. */ | |
1258 | ||
1259 | list_splice_init(head, &data->pages); | |
1260 | first = nfs_list_entry(data->pages.next); | |
1da177e4 LT |
1261 | inode = first->wb_context->dentry->d_inode; |
1262 | ||
1da177e4 LT |
1263 | data->inode = inode; |
1264 | data->cred = first->wb_context->cred; | |
1265 | ||
1266 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1267 | /* Note: we always request a commit of the entire inode */ |
1268 | data->args.offset = 0; | |
1269 | data->args.count = 0; | |
1270 | data->res.count = 0; | |
1da177e4 LT |
1271 | data->res.fattr = &data->fattr; |
1272 | data->res.verf = &data->verf; | |
0e574af1 | 1273 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1274 | |
1275 | /* Set up the initial task struct. */ | |
1276 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
1277 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data); | |
1da177e4 LT |
1278 | NFS_PROTO(inode)->commit_setup(data, how); |
1279 | ||
1280 | data->task.tk_priority = flush_task_priority(how); | |
1281 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 1282 | |
0bbacc40 | 1283 | dprintk("NFS: %4d initiated commit call\n", data->task.tk_pid); |
1da177e4 LT |
1284 | } |
1285 | ||
1286 | /* | |
1287 | * Commit dirty pages | |
1288 | */ | |
1289 | static int | |
40859d7e | 1290 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1291 | { |
1292 | struct nfs_write_data *data; | |
1293 | struct nfs_page *req; | |
1294 | ||
e9f7bee1 | 1295 | data = nfs_commit_alloc(); |
1da177e4 LT |
1296 | |
1297 | if (!data) | |
1298 | goto out_bad; | |
1299 | ||
1300 | /* Set up the argument struct */ | |
1301 | nfs_commit_rpcsetup(head, data, how); | |
1302 | ||
1303 | nfs_execute_write(data); | |
1304 | return 0; | |
1305 | out_bad: | |
1306 | while (!list_empty(head)) { | |
1307 | req = nfs_list_entry(head->next); | |
1308 | nfs_list_remove_request(req); | |
1309 | nfs_mark_request_commit(req); | |
83715ad5 | 1310 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
5c2d97cb | 1311 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1312 | } |
1313 | return -ENOMEM; | |
1314 | } | |
1315 | ||
1316 | /* | |
1317 | * COMMIT call returned | |
1318 | */ | |
788e7a89 | 1319 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1320 | { |
963d8fe5 | 1321 | struct nfs_write_data *data = calldata; |
1da177e4 | 1322 | struct nfs_page *req; |
1da177e4 LT |
1323 | |
1324 | dprintk("NFS: %4d nfs_commit_done (status %d)\n", | |
1325 | task->tk_pid, task->tk_status); | |
1326 | ||
788e7a89 TM |
1327 | /* Call the NFS version-specific code */ |
1328 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1329 | return; | |
1330 | ||
1da177e4 LT |
1331 | while (!list_empty(&data->pages)) { |
1332 | req = nfs_list_entry(data->pages.next); | |
1333 | nfs_list_remove_request(req); | |
fd39fc85 | 1334 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
1da177e4 LT |
1335 | |
1336 | dprintk("NFS: commit (%s/%Ld %d@%Ld)", | |
1337 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1338 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1339 | req->wb_bytes, | |
1340 | (long long)req_offset(req)); | |
1341 | if (task->tk_status < 0) { | |
1342 | req->wb_context->error = task->tk_status; | |
1343 | nfs_inode_remove_request(req); | |
1344 | dprintk(", error = %d\n", task->tk_status); | |
1345 | goto next; | |
1346 | } | |
1347 | ||
1348 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1349 | * returned by the server against all stored verfs. */ | |
1350 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1351 | /* We have a match */ | |
1352 | nfs_inode_remove_request(req); | |
1353 | dprintk(" OK\n"); | |
1354 | goto next; | |
1355 | } | |
1356 | /* We have a mismatch. Write the page again */ | |
1357 | dprintk(" mismatch\n"); | |
1358 | nfs_mark_request_dirty(req); | |
1359 | next: | |
c6a556b8 | 1360 | nfs_clear_page_writeback(req); |
1da177e4 | 1361 | } |
1da177e4 | 1362 | } |
788e7a89 TM |
1363 | |
1364 | static const struct rpc_call_ops nfs_commit_ops = { | |
1365 | .rpc_call_done = nfs_commit_done, | |
1366 | .rpc_release = nfs_commit_release, | |
1367 | }; | |
c42de9dd TM |
1368 | #else |
1369 | static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) | |
1370 | { | |
1371 | return 0; | |
1372 | } | |
1da177e4 LT |
1373 | #endif |
1374 | ||
3f442547 | 1375 | static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1376 | { |
28c6925f | 1377 | struct nfs_inode *nfsi = NFS_I(mapping->host); |
1da177e4 | 1378 | LIST_HEAD(head); |
3f442547 | 1379 | long res; |
1da177e4 LT |
1380 | |
1381 | spin_lock(&nfsi->req_lock); | |
3f442547 | 1382 | res = nfs_scan_dirty(mapping, wbc, &head); |
1da177e4 | 1383 | spin_unlock(&nfsi->req_lock); |
ab0a3dbe | 1384 | if (res) { |
28c6925f | 1385 | int error = nfs_flush_list(mapping->host, &head, res, how); |
7d46a49f TM |
1386 | if (error < 0) |
1387 | return error; | |
ab0a3dbe | 1388 | } |
1da177e4 LT |
1389 | return res; |
1390 | } | |
1391 | ||
1392 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
3da28eb1 | 1393 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 LT |
1394 | { |
1395 | struct nfs_inode *nfsi = NFS_I(inode); | |
1396 | LIST_HEAD(head); | |
7d46a49f | 1397 | int res; |
1da177e4 LT |
1398 | |
1399 | spin_lock(&nfsi->req_lock); | |
3da28eb1 TM |
1400 | res = nfs_scan_commit(inode, &head, 0, 0); |
1401 | spin_unlock(&nfsi->req_lock); | |
1da177e4 | 1402 | if (res) { |
7d46a49f | 1403 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1404 | if (error < 0) |
1405 | return error; | |
1406 | } | |
1da177e4 LT |
1407 | return res; |
1408 | } | |
1409 | #endif | |
1410 | ||
1c75950b | 1411 | long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1412 | { |
1c75950b | 1413 | struct inode *inode = mapping->host; |
c42de9dd | 1414 | struct nfs_inode *nfsi = NFS_I(inode); |
1c75950b TM |
1415 | unsigned long idx_start, idx_end; |
1416 | unsigned int npages = 0; | |
c42de9dd | 1417 | LIST_HEAD(head); |
70b9ecbd | 1418 | int nocommit = how & FLUSH_NOCOMMIT; |
3f442547 | 1419 | long pages, ret; |
1da177e4 | 1420 | |
1c75950b TM |
1421 | /* FIXME */ |
1422 | if (wbc->range_cyclic) | |
1423 | idx_start = 0; | |
1424 | else { | |
1425 | idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1426 | idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1427 | if (idx_end > idx_start) { | |
1428 | unsigned long l_npages = 1 + idx_end - idx_start; | |
1429 | npages = l_npages; | |
1430 | if (sizeof(npages) != sizeof(l_npages) && | |
1431 | (unsigned long)npages != l_npages) | |
1432 | npages = 0; | |
1433 | } | |
1434 | } | |
c42de9dd TM |
1435 | how &= ~FLUSH_NOCOMMIT; |
1436 | spin_lock(&nfsi->req_lock); | |
1da177e4 | 1437 | do { |
1c75950b | 1438 | wbc->pages_skipped = 0; |
c42de9dd TM |
1439 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); |
1440 | if (ret != 0) | |
70b9ecbd | 1441 | continue; |
1c75950b | 1442 | pages = nfs_scan_dirty(mapping, wbc, &head); |
c42de9dd TM |
1443 | if (pages != 0) { |
1444 | spin_unlock(&nfsi->req_lock); | |
e8e058e8 | 1445 | if (how & FLUSH_INVALIDATE) { |
83715ad5 | 1446 | nfs_cancel_dirty_list(&head); |
e8e058e8 TM |
1447 | ret = pages; |
1448 | } else | |
d2ccddf0 | 1449 | ret = nfs_flush_list(inode, &head, pages, how); |
c42de9dd TM |
1450 | spin_lock(&nfsi->req_lock); |
1451 | continue; | |
1452 | } | |
1c75950b TM |
1453 | if (wbc->pages_skipped != 0) |
1454 | continue; | |
c42de9dd TM |
1455 | if (nocommit) |
1456 | break; | |
d2ccddf0 | 1457 | pages = nfs_scan_commit(inode, &head, idx_start, npages); |
1c75950b TM |
1458 | if (pages == 0) { |
1459 | if (wbc->pages_skipped != 0) | |
1460 | continue; | |
c42de9dd | 1461 | break; |
1c75950b | 1462 | } |
d2ccddf0 TM |
1463 | if (how & FLUSH_INVALIDATE) { |
1464 | spin_unlock(&nfsi->req_lock); | |
83715ad5 | 1465 | nfs_cancel_commit_list(&head); |
e8e058e8 | 1466 | ret = pages; |
d2ccddf0 TM |
1467 | spin_lock(&nfsi->req_lock); |
1468 | continue; | |
1469 | } | |
1470 | pages += nfs_scan_commit(inode, &head, 0, 0); | |
c42de9dd TM |
1471 | spin_unlock(&nfsi->req_lock); |
1472 | ret = nfs_commit_list(inode, &head, how); | |
1473 | spin_lock(&nfsi->req_lock); | |
1474 | } while (ret >= 0); | |
1475 | spin_unlock(&nfsi->req_lock); | |
1476 | return ret; | |
1da177e4 LT |
1477 | } |
1478 | ||
1c75950b TM |
1479 | /* |
1480 | * flush the inode to disk. | |
1481 | */ | |
1482 | int nfs_wb_all(struct inode *inode) | |
1483 | { | |
1484 | struct address_space *mapping = inode->i_mapping; | |
1485 | struct writeback_control wbc = { | |
1486 | .bdi = mapping->backing_dev_info, | |
1487 | .sync_mode = WB_SYNC_ALL, | |
1488 | .nr_to_write = LONG_MAX, | |
1489 | .range_cyclic = 1, | |
1490 | }; | |
1491 | int ret; | |
1492 | ||
1493 | ret = nfs_sync_mapping_wait(mapping, &wbc, 0); | |
1494 | if (ret >= 0) | |
1495 | return 0; | |
1496 | return ret; | |
1497 | } | |
1498 | ||
1499 | int nfs_sync_mapping_range(struct address_space *mapping, loff_t range_start, loff_t range_end, int how) | |
1500 | { | |
1501 | struct writeback_control wbc = { | |
1502 | .bdi = mapping->backing_dev_info, | |
1503 | .sync_mode = WB_SYNC_ALL, | |
1504 | .nr_to_write = LONG_MAX, | |
1505 | .range_start = range_start, | |
1506 | .range_end = range_end, | |
1507 | }; | |
1508 | int ret; | |
1509 | ||
1510 | ret = nfs_sync_mapping_wait(mapping, &wbc, how); | |
1511 | if (ret >= 0) | |
1512 | return 0; | |
1513 | return ret; | |
1514 | } | |
1515 | ||
1516 | static int nfs_wb_page_priority(struct inode *inode, struct page *page, int how) | |
1517 | { | |
1518 | loff_t range_start = page_offset(page); | |
1519 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
1520 | ||
1521 | return nfs_sync_mapping_range(inode->i_mapping, range_start, range_end, how | FLUSH_STABLE); | |
1522 | } | |
1523 | ||
1524 | /* | |
1525 | * Write back all requests on one page - we do this before reading it. | |
1526 | */ | |
1527 | int nfs_wb_page(struct inode *inode, struct page* page) | |
1528 | { | |
1529 | return nfs_wb_page_priority(inode, page, 0); | |
1530 | } | |
1531 | ||
1532 | ||
f7b422b1 | 1533 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1534 | { |
1535 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1536 | sizeof(struct nfs_write_data), | |
1537 | 0, SLAB_HWCACHE_ALIGN, | |
1538 | NULL, NULL); | |
1539 | if (nfs_wdata_cachep == NULL) | |
1540 | return -ENOMEM; | |
1541 | ||
93d2341c MD |
1542 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1543 | nfs_wdata_cachep); | |
1da177e4 LT |
1544 | if (nfs_wdata_mempool == NULL) |
1545 | return -ENOMEM; | |
1546 | ||
93d2341c MD |
1547 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1548 | nfs_wdata_cachep); | |
1da177e4 LT |
1549 | if (nfs_commit_mempool == NULL) |
1550 | return -ENOMEM; | |
1551 | ||
1552 | return 0; | |
1553 | } | |
1554 | ||
266bee88 | 1555 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1556 | { |
1557 | mempool_destroy(nfs_commit_mempool); | |
1558 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1559 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1560 | } |
1561 |