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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" | |
91d5b470 | 66 | #include "iostat.h" |
1da177e4 LT |
67 | |
68 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE | |
69 | ||
70 | #define MIN_POOL_WRITE (32) | |
71 | #define MIN_POOL_COMMIT (4) | |
72 | ||
73 | /* | |
74 | * Local function declarations | |
75 | */ | |
76 | static struct nfs_page * nfs_update_request(struct nfs_open_context*, | |
77 | struct inode *, | |
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); | |
28c6925f | 82 | static int nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how); |
788e7a89 TM |
83 | static const struct rpc_call_ops nfs_write_partial_ops; |
84 | static const struct rpc_call_ops nfs_write_full_ops; | |
85 | static const struct rpc_call_ops nfs_commit_ops; | |
1da177e4 LT |
86 | |
87 | static kmem_cache_t *nfs_wdata_cachep; | |
3feb2d49 | 88 | static mempool_t *nfs_wdata_mempool; |
1da177e4 LT |
89 | static mempool_t *nfs_commit_mempool; |
90 | ||
91 | static DECLARE_WAIT_QUEUE_HEAD(nfs_write_congestion); | |
92 | ||
e9f7bee1 | 93 | struct nfs_write_data *nfs_commit_alloc(void) |
1da177e4 LT |
94 | { |
95 | struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, SLAB_NOFS); | |
40859d7e | 96 | |
1da177e4 LT |
97 | if (p) { |
98 | memset(p, 0, sizeof(*p)); | |
99 | INIT_LIST_HEAD(&p->pages); | |
100 | } | |
101 | return p; | |
102 | } | |
103 | ||
8aca67f0 | 104 | void nfs_commit_rcu_free(struct rcu_head *head) |
1da177e4 | 105 | { |
8aca67f0 | 106 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
40859d7e CL |
107 | if (p && (p->pagevec != &p->page_array[0])) |
108 | kfree(p->pagevec); | |
1da177e4 LT |
109 | mempool_free(p, nfs_commit_mempool); |
110 | } | |
111 | ||
8aca67f0 TM |
112 | void nfs_commit_free(struct nfs_write_data *wdata) |
113 | { | |
114 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_commit_rcu_free); | |
115 | } | |
116 | ||
e9f7bee1 | 117 | struct nfs_write_data *nfs_writedata_alloc(size_t len) |
3feb2d49 | 118 | { |
e9f7bee1 | 119 | unsigned int pagecount = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
3feb2d49 TM |
120 | struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, SLAB_NOFS); |
121 | ||
122 | if (p) { | |
123 | memset(p, 0, sizeof(*p)); | |
124 | INIT_LIST_HEAD(&p->pages); | |
e9f7bee1 | 125 | p->npages = pagecount; |
0d0b5cb3 CL |
126 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
127 | p->pagevec = p->page_array; | |
3feb2d49 | 128 | else { |
0d0b5cb3 CL |
129 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
130 | if (!p->pagevec) { | |
3feb2d49 TM |
131 | mempool_free(p, nfs_wdata_mempool); |
132 | p = NULL; | |
133 | } | |
134 | } | |
135 | } | |
136 | return p; | |
137 | } | |
138 | ||
8aca67f0 | 139 | static void nfs_writedata_rcu_free(struct rcu_head *head) |
3feb2d49 | 140 | { |
8aca67f0 | 141 | struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu); |
3feb2d49 TM |
142 | if (p && (p->pagevec != &p->page_array[0])) |
143 | kfree(p->pagevec); | |
144 | mempool_free(p, nfs_wdata_mempool); | |
145 | } | |
146 | ||
8aca67f0 TM |
147 | static void nfs_writedata_free(struct nfs_write_data *wdata) |
148 | { | |
149 | call_rcu_bh(&wdata->task.u.tk_rcu, nfs_writedata_rcu_free); | |
150 | } | |
151 | ||
963d8fe5 | 152 | void nfs_writedata_release(void *wdata) |
1da177e4 | 153 | { |
1da177e4 LT |
154 | nfs_writedata_free(wdata); |
155 | } | |
156 | ||
157 | /* Adjust the file length if we're writing beyond the end */ | |
158 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) | |
159 | { | |
160 | struct inode *inode = page->mapping->host; | |
161 | loff_t end, i_size = i_size_read(inode); | |
162 | unsigned long end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; | |
163 | ||
164 | if (i_size > 0 && page->index < end_index) | |
165 | return; | |
166 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); | |
167 | if (i_size >= end) | |
168 | return; | |
91d5b470 | 169 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
1da177e4 LT |
170 | i_size_write(inode, end); |
171 | } | |
172 | ||
173 | /* We can set the PG_uptodate flag if we see that a write request | |
174 | * covers the full page. | |
175 | */ | |
176 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) | |
177 | { | |
178 | loff_t end_offs; | |
179 | ||
180 | if (PageUptodate(page)) | |
181 | return; | |
182 | if (base != 0) | |
183 | return; | |
184 | if (count == PAGE_CACHE_SIZE) { | |
185 | SetPageUptodate(page); | |
186 | return; | |
187 | } | |
188 | ||
189 | end_offs = i_size_read(page->mapping->host) - 1; | |
190 | if (end_offs < 0) | |
191 | return; | |
192 | /* Is this the last page? */ | |
193 | if (page->index != (unsigned long)(end_offs >> PAGE_CACHE_SHIFT)) | |
194 | return; | |
195 | /* This is the last page: set PG_uptodate if we cover the entire | |
196 | * extent of the data, then zero the rest of the page. | |
197 | */ | |
198 | if (count == (unsigned int)(end_offs & (PAGE_CACHE_SIZE - 1)) + 1) { | |
199 | memclear_highpage_flush(page, count, PAGE_CACHE_SIZE - count); | |
200 | SetPageUptodate(page); | |
201 | } | |
202 | } | |
203 | ||
204 | /* | |
205 | * Write a page synchronously. | |
206 | * Offset is the data offset within the page. | |
207 | */ | |
208 | static int nfs_writepage_sync(struct nfs_open_context *ctx, struct inode *inode, | |
209 | struct page *page, unsigned int offset, unsigned int count, | |
210 | int how) | |
211 | { | |
212 | unsigned int wsize = NFS_SERVER(inode)->wsize; | |
213 | int result, written = 0; | |
214 | struct nfs_write_data *wdata; | |
215 | ||
e9f7bee1 | 216 | wdata = nfs_writedata_alloc(wsize); |
1da177e4 LT |
217 | if (!wdata) |
218 | return -ENOMEM; | |
219 | ||
220 | wdata->flags = how; | |
221 | wdata->cred = ctx->cred; | |
222 | wdata->inode = inode; | |
223 | wdata->args.fh = NFS_FH(inode); | |
224 | wdata->args.context = ctx; | |
225 | wdata->args.pages = &page; | |
226 | wdata->args.stable = NFS_FILE_SYNC; | |
227 | wdata->args.pgbase = offset; | |
228 | wdata->args.count = wsize; | |
229 | wdata->res.fattr = &wdata->fattr; | |
230 | wdata->res.verf = &wdata->verf; | |
231 | ||
232 | dprintk("NFS: nfs_writepage_sync(%s/%Ld %d@%Ld)\n", | |
233 | inode->i_sb->s_id, | |
234 | (long long)NFS_FILEID(inode), | |
235 | count, (long long)(page_offset(page) + offset)); | |
236 | ||
bb713d6d | 237 | set_page_writeback(page); |
1da177e4 LT |
238 | nfs_begin_data_update(inode); |
239 | do { | |
240 | if (count < wsize) | |
241 | wdata->args.count = count; | |
242 | wdata->args.offset = page_offset(page) + wdata->args.pgbase; | |
243 | ||
244 | result = NFS_PROTO(inode)->write(wdata); | |
245 | ||
246 | if (result < 0) { | |
247 | /* Must mark the page invalid after I/O error */ | |
248 | ClearPageUptodate(page); | |
249 | goto io_error; | |
250 | } | |
251 | if (result < wdata->args.count) | |
252 | printk(KERN_WARNING "NFS: short write, count=%u, result=%d\n", | |
253 | wdata->args.count, result); | |
254 | ||
255 | wdata->args.offset += result; | |
256 | wdata->args.pgbase += result; | |
257 | written += result; | |
258 | count -= result; | |
91d5b470 | 259 | nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, result); |
1da177e4 LT |
260 | } while (count); |
261 | /* Update file length */ | |
262 | nfs_grow_file(page, offset, written); | |
263 | /* Set the PG_uptodate flag? */ | |
264 | nfs_mark_uptodate(page, offset, written); | |
265 | ||
266 | if (PageError(page)) | |
267 | ClearPageError(page); | |
268 | ||
269 | io_error: | |
951a143b | 270 | nfs_end_data_update(inode); |
bb713d6d | 271 | end_page_writeback(page); |
8aca67f0 | 272 | nfs_writedata_release(wdata); |
1da177e4 LT |
273 | return written ? written : result; |
274 | } | |
275 | ||
276 | static int nfs_writepage_async(struct nfs_open_context *ctx, | |
277 | struct inode *inode, struct page *page, | |
278 | unsigned int offset, unsigned int count) | |
279 | { | |
280 | struct nfs_page *req; | |
1da177e4 LT |
281 | |
282 | req = nfs_update_request(ctx, inode, page, offset, count); | |
abd3e641 TM |
283 | if (IS_ERR(req)) |
284 | return PTR_ERR(req); | |
1da177e4 LT |
285 | /* Update file length */ |
286 | nfs_grow_file(page, offset, count); | |
287 | /* Set the PG_uptodate flag? */ | |
288 | nfs_mark_uptodate(page, offset, count); | |
289 | nfs_unlock_request(req); | |
abd3e641 | 290 | return 0; |
1da177e4 LT |
291 | } |
292 | ||
293 | static int wb_priority(struct writeback_control *wbc) | |
294 | { | |
295 | if (wbc->for_reclaim) | |
296 | return FLUSH_HIGHPRI; | |
297 | if (wbc->for_kupdate) | |
298 | return FLUSH_LOWPRI; | |
299 | return 0; | |
300 | } | |
301 | ||
302 | /* | |
303 | * Write an mmapped page to the server. | |
304 | */ | |
305 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
306 | { | |
307 | struct nfs_open_context *ctx; | |
308 | struct inode *inode = page->mapping->host; | |
309 | unsigned long end_index; | |
310 | unsigned offset = PAGE_CACHE_SIZE; | |
311 | loff_t i_size = i_size_read(inode); | |
312 | int inode_referenced = 0; | |
313 | int priority = wb_priority(wbc); | |
314 | int err; | |
315 | ||
91d5b470 CL |
316 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
317 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
318 | ||
1da177e4 LT |
319 | /* |
320 | * Note: We need to ensure that we have a reference to the inode | |
321 | * if we are to do asynchronous writes. If not, waiting | |
322 | * in nfs_wait_on_request() may deadlock with clear_inode(). | |
323 | * | |
324 | * If igrab() fails here, then it is in any case safe to | |
325 | * call nfs_wb_page(), since there will be no pending writes. | |
326 | */ | |
327 | if (igrab(inode) != 0) | |
328 | inode_referenced = 1; | |
329 | end_index = i_size >> PAGE_CACHE_SHIFT; | |
330 | ||
331 | /* Ensure we've flushed out any previous writes */ | |
332 | nfs_wb_page_priority(inode, page, priority); | |
333 | ||
334 | /* easy case */ | |
335 | if (page->index < end_index) | |
336 | goto do_it; | |
337 | /* things got complicated... */ | |
338 | offset = i_size & (PAGE_CACHE_SIZE-1); | |
339 | ||
340 | /* OK, are we completely out? */ | |
341 | err = 0; /* potential race with truncate - ignore */ | |
342 | if (page->index >= end_index+1 || !offset) | |
343 | goto out; | |
344 | do_it: | |
d530838b | 345 | ctx = nfs_find_open_context(inode, NULL, FMODE_WRITE); |
1da177e4 LT |
346 | if (ctx == NULL) { |
347 | err = -EBADF; | |
348 | goto out; | |
349 | } | |
350 | lock_kernel(); | |
351 | if (!IS_SYNC(inode) && inode_referenced) { | |
352 | err = nfs_writepage_async(ctx, inode, page, 0, offset); | |
abd3e641 | 353 | if (!wbc->for_writepages) |
28c6925f | 354 | nfs_flush_mapping(page->mapping, wbc, wb_priority(wbc)); |
1da177e4 LT |
355 | } else { |
356 | err = nfs_writepage_sync(ctx, inode, page, 0, | |
357 | offset, priority); | |
358 | if (err >= 0) { | |
359 | if (err != offset) | |
360 | redirty_page_for_writepage(wbc, page); | |
361 | err = 0; | |
362 | } | |
363 | } | |
364 | unlock_kernel(); | |
365 | put_nfs_open_context(ctx); | |
366 | out: | |
367 | unlock_page(page); | |
368 | if (inode_referenced) | |
369 | iput(inode); | |
370 | return err; | |
371 | } | |
372 | ||
373 | /* | |
374 | * Note: causes nfs_update_request() to block on the assumption | |
375 | * that the writeback is generated due to memory pressure. | |
376 | */ | |
377 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) | |
378 | { | |
379 | struct backing_dev_info *bdi = mapping->backing_dev_info; | |
380 | struct inode *inode = mapping->host; | |
381 | int err; | |
382 | ||
91d5b470 CL |
383 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
384 | ||
1da177e4 LT |
385 | err = generic_writepages(mapping, wbc); |
386 | if (err) | |
387 | return err; | |
388 | while (test_and_set_bit(BDI_write_congested, &bdi->state) != 0) { | |
389 | if (wbc->nonblocking) | |
390 | return 0; | |
391 | nfs_wait_on_write_congestion(mapping, 0); | |
392 | } | |
28c6925f | 393 | err = nfs_flush_mapping(mapping, wbc, wb_priority(wbc)); |
1da177e4 LT |
394 | if (err < 0) |
395 | goto out; | |
91d5b470 | 396 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, err); |
1da177e4 LT |
397 | if (!wbc->nonblocking && wbc->sync_mode == WB_SYNC_ALL) { |
398 | err = nfs_wait_on_requests(inode, 0, 0); | |
399 | if (err < 0) | |
400 | goto out; | |
401 | } | |
3da28eb1 | 402 | err = nfs_commit_inode(inode, wb_priority(wbc)); |
1da177e4 LT |
403 | if (err > 0) { |
404 | wbc->nr_to_write -= err; | |
405 | err = 0; | |
406 | } | |
407 | out: | |
408 | clear_bit(BDI_write_congested, &bdi->state); | |
409 | wake_up_all(&nfs_write_congestion); | |
3fcfab16 | 410 | congestion_end(WRITE); |
1da177e4 LT |
411 | return err; |
412 | } | |
413 | ||
414 | /* | |
415 | * Insert a write request into an inode | |
416 | */ | |
417 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) | |
418 | { | |
419 | struct nfs_inode *nfsi = NFS_I(inode); | |
420 | int error; | |
421 | ||
422 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); | |
423 | BUG_ON(error == -EEXIST); | |
424 | if (error) | |
425 | return error; | |
426 | if (!nfsi->npages) { | |
427 | igrab(inode); | |
428 | nfs_begin_data_update(inode); | |
429 | if (nfs_have_delegation(inode, FMODE_WRITE)) | |
430 | nfsi->change_attr++; | |
431 | } | |
deb7d638 | 432 | SetPagePrivate(req->wb_page); |
1da177e4 LT |
433 | nfsi->npages++; |
434 | atomic_inc(&req->wb_count); | |
435 | return 0; | |
436 | } | |
437 | ||
438 | /* | |
439 | * Insert a write request into an inode | |
440 | */ | |
441 | static void nfs_inode_remove_request(struct nfs_page *req) | |
442 | { | |
443 | struct inode *inode = req->wb_context->dentry->d_inode; | |
444 | struct nfs_inode *nfsi = NFS_I(inode); | |
445 | ||
446 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
447 | ||
448 | spin_lock(&nfsi->req_lock); | |
deb7d638 | 449 | ClearPagePrivate(req->wb_page); |
1da177e4 LT |
450 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
451 | nfsi->npages--; | |
452 | if (!nfsi->npages) { | |
453 | spin_unlock(&nfsi->req_lock); | |
951a143b | 454 | nfs_end_data_update(inode); |
1da177e4 LT |
455 | iput(inode); |
456 | } else | |
457 | spin_unlock(&nfsi->req_lock); | |
458 | nfs_clear_request(req); | |
459 | nfs_release_request(req); | |
460 | } | |
461 | ||
462 | /* | |
463 | * Find a request | |
464 | */ | |
465 | static inline struct nfs_page * | |
466 | _nfs_find_request(struct inode *inode, unsigned long index) | |
467 | { | |
468 | struct nfs_inode *nfsi = NFS_I(inode); | |
469 | struct nfs_page *req; | |
470 | ||
471 | req = (struct nfs_page*)radix_tree_lookup(&nfsi->nfs_page_tree, index); | |
472 | if (req) | |
473 | atomic_inc(&req->wb_count); | |
474 | return req; | |
475 | } | |
476 | ||
477 | static struct nfs_page * | |
478 | nfs_find_request(struct inode *inode, unsigned long index) | |
479 | { | |
480 | struct nfs_page *req; | |
481 | struct nfs_inode *nfsi = NFS_I(inode); | |
482 | ||
483 | spin_lock(&nfsi->req_lock); | |
484 | req = _nfs_find_request(inode, index); | |
485 | spin_unlock(&nfsi->req_lock); | |
486 | return req; | |
487 | } | |
488 | ||
489 | /* | |
490 | * Add a request to the inode's dirty list. | |
491 | */ | |
492 | static void | |
493 | nfs_mark_request_dirty(struct nfs_page *req) | |
494 | { | |
495 | struct inode *inode = req->wb_context->dentry->d_inode; | |
496 | struct nfs_inode *nfsi = NFS_I(inode); | |
497 | ||
498 | spin_lock(&nfsi->req_lock); | |
3da28eb1 TM |
499 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
500 | req->wb_index, NFS_PAGE_TAG_DIRTY); | |
1da177e4 LT |
501 | nfs_list_add_request(req, &nfsi->dirty); |
502 | nfsi->ndirty++; | |
503 | spin_unlock(&nfsi->req_lock); | |
b1e7a8fd | 504 | inc_zone_page_state(req->wb_page, NR_FILE_DIRTY); |
1da177e4 LT |
505 | mark_inode_dirty(inode); |
506 | } | |
507 | ||
508 | /* | |
509 | * Check if a request is dirty | |
510 | */ | |
511 | static inline int | |
512 | nfs_dirty_request(struct nfs_page *req) | |
513 | { | |
514 | struct nfs_inode *nfsi = NFS_I(req->wb_context->dentry->d_inode); | |
515 | return !list_empty(&req->wb_list) && req->wb_list_head == &nfsi->dirty; | |
516 | } | |
517 | ||
518 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
519 | /* | |
520 | * Add a request to the inode's commit list. | |
521 | */ | |
522 | static void | |
523 | nfs_mark_request_commit(struct nfs_page *req) | |
524 | { | |
525 | struct inode *inode = req->wb_context->dentry->d_inode; | |
526 | struct nfs_inode *nfsi = NFS_I(inode); | |
527 | ||
528 | spin_lock(&nfsi->req_lock); | |
529 | nfs_list_add_request(req, &nfsi->commit); | |
530 | nfsi->ncommit++; | |
531 | spin_unlock(&nfsi->req_lock); | |
fd39fc85 | 532 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
1da177e4 LT |
533 | mark_inode_dirty(inode); |
534 | } | |
535 | #endif | |
536 | ||
537 | /* | |
538 | * Wait for a request to complete. | |
539 | * | |
540 | * Interruptible by signals only if mounted with intr flag. | |
541 | */ | |
c42de9dd | 542 | static int nfs_wait_on_requests_locked(struct inode *inode, unsigned long idx_start, unsigned int npages) |
1da177e4 LT |
543 | { |
544 | struct nfs_inode *nfsi = NFS_I(inode); | |
545 | struct nfs_page *req; | |
546 | unsigned long idx_end, next; | |
547 | unsigned int res = 0; | |
548 | int error; | |
549 | ||
550 | if (npages == 0) | |
551 | idx_end = ~0; | |
552 | else | |
553 | idx_end = idx_start + npages - 1; | |
554 | ||
1da177e4 | 555 | next = idx_start; |
c6a556b8 | 556 | while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_WRITEBACK)) { |
1da177e4 LT |
557 | if (req->wb_index > idx_end) |
558 | break; | |
559 | ||
560 | next = req->wb_index + 1; | |
c6a556b8 | 561 | BUG_ON(!NFS_WBACK_BUSY(req)); |
1da177e4 LT |
562 | |
563 | atomic_inc(&req->wb_count); | |
564 | spin_unlock(&nfsi->req_lock); | |
565 | error = nfs_wait_on_request(req); | |
566 | nfs_release_request(req); | |
c42de9dd | 567 | spin_lock(&nfsi->req_lock); |
1da177e4 LT |
568 | if (error < 0) |
569 | return error; | |
1da177e4 LT |
570 | res++; |
571 | } | |
1da177e4 LT |
572 | return res; |
573 | } | |
574 | ||
c42de9dd TM |
575 | static int nfs_wait_on_requests(struct inode *inode, unsigned long idx_start, unsigned int npages) |
576 | { | |
577 | struct nfs_inode *nfsi = NFS_I(inode); | |
578 | int ret; | |
579 | ||
580 | spin_lock(&nfsi->req_lock); | |
581 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); | |
582 | spin_unlock(&nfsi->req_lock); | |
583 | return ret; | |
584 | } | |
585 | ||
83715ad5 | 586 | static void nfs_cancel_dirty_list(struct list_head *head) |
d2ccddf0 TM |
587 | { |
588 | struct nfs_page *req; | |
589 | while(!list_empty(head)) { | |
590 | req = nfs_list_entry(head->next); | |
591 | nfs_list_remove_request(req); | |
592 | nfs_inode_remove_request(req); | |
593 | nfs_clear_page_writeback(req); | |
594 | } | |
595 | } | |
596 | ||
83715ad5 TM |
597 | static void nfs_cancel_commit_list(struct list_head *head) |
598 | { | |
599 | struct nfs_page *req; | |
600 | ||
601 | while(!list_empty(head)) { | |
602 | req = nfs_list_entry(head->next); | |
b6dff26a | 603 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
83715ad5 TM |
604 | nfs_list_remove_request(req); |
605 | nfs_inode_remove_request(req); | |
b6dff26a | 606 | nfs_unlock_request(req); |
83715ad5 TM |
607 | } |
608 | } | |
609 | ||
1da177e4 LT |
610 | /* |
611 | * nfs_scan_dirty - Scan an inode for dirty requests | |
612 | * @inode: NFS inode to scan | |
613 | * @dst: destination list | |
614 | * @idx_start: lower bound of page->index to scan. | |
615 | * @npages: idx_start + npages sets the upper bound to scan. | |
616 | * | |
617 | * Moves requests from the inode's dirty page list. | |
618 | * The requests are *not* checked to ensure that they form a contiguous set. | |
619 | */ | |
620 | static int | |
621 | nfs_scan_dirty(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
622 | { | |
623 | struct nfs_inode *nfsi = NFS_I(inode); | |
3da28eb1 TM |
624 | int res = 0; |
625 | ||
626 | if (nfsi->ndirty != 0) { | |
627 | res = nfs_scan_lock_dirty(nfsi, dst, idx_start, npages); | |
628 | nfsi->ndirty -= res; | |
3da28eb1 TM |
629 | if ((nfsi->ndirty == 0) != list_empty(&nfsi->dirty)) |
630 | printk(KERN_ERR "NFS: desynchronized value of nfs_i.ndirty.\n"); | |
631 | } | |
1da177e4 LT |
632 | return res; |
633 | } | |
634 | ||
635 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
636 | /* | |
637 | * nfs_scan_commit - Scan an inode for commit requests | |
638 | * @inode: NFS inode to scan | |
639 | * @dst: destination list | |
640 | * @idx_start: lower bound of page->index to scan. | |
641 | * @npages: idx_start + npages sets the upper bound to scan. | |
642 | * | |
643 | * Moves requests from the inode's 'commit' request list. | |
644 | * The requests are *not* checked to ensure that they form a contiguous set. | |
645 | */ | |
646 | static int | |
647 | nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
648 | { | |
649 | struct nfs_inode *nfsi = NFS_I(inode); | |
3da28eb1 TM |
650 | int res = 0; |
651 | ||
652 | if (nfsi->ncommit != 0) { | |
d2ccddf0 | 653 | res = nfs_scan_list(nfsi, &nfsi->commit, dst, idx_start, npages); |
3da28eb1 TM |
654 | nfsi->ncommit -= res; |
655 | if ((nfsi->ncommit == 0) != list_empty(&nfsi->commit)) | |
656 | printk(KERN_ERR "NFS: desynchronized value of nfs_i.ncommit.\n"); | |
657 | } | |
1da177e4 LT |
658 | return res; |
659 | } | |
c42de9dd TM |
660 | #else |
661 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) | |
662 | { | |
663 | return 0; | |
664 | } | |
1da177e4 LT |
665 | #endif |
666 | ||
667 | static int nfs_wait_on_write_congestion(struct address_space *mapping, int intr) | |
668 | { | |
669 | struct backing_dev_info *bdi = mapping->backing_dev_info; | |
670 | DEFINE_WAIT(wait); | |
671 | int ret = 0; | |
672 | ||
673 | might_sleep(); | |
674 | ||
675 | if (!bdi_write_congested(bdi)) | |
676 | return 0; | |
91d5b470 CL |
677 | |
678 | nfs_inc_stats(mapping->host, NFSIOS_CONGESTIONWAIT); | |
679 | ||
1da177e4 LT |
680 | if (intr) { |
681 | struct rpc_clnt *clnt = NFS_CLIENT(mapping->host); | |
682 | sigset_t oldset; | |
683 | ||
684 | rpc_clnt_sigmask(clnt, &oldset); | |
685 | prepare_to_wait(&nfs_write_congestion, &wait, TASK_INTERRUPTIBLE); | |
686 | if (bdi_write_congested(bdi)) { | |
687 | if (signalled()) | |
688 | ret = -ERESTARTSYS; | |
689 | else | |
690 | schedule(); | |
691 | } | |
692 | rpc_clnt_sigunmask(clnt, &oldset); | |
693 | } else { | |
694 | prepare_to_wait(&nfs_write_congestion, &wait, TASK_UNINTERRUPTIBLE); | |
695 | if (bdi_write_congested(bdi)) | |
696 | schedule(); | |
697 | } | |
698 | finish_wait(&nfs_write_congestion, &wait); | |
699 | return ret; | |
700 | } | |
701 | ||
702 | ||
703 | /* | |
704 | * Try to update any existing write request, or create one if there is none. | |
705 | * In order to match, the request's credentials must match those of | |
706 | * the calling process. | |
707 | * | |
708 | * Note: Should always be called with the Page Lock held! | |
709 | */ | |
710 | static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, | |
711 | struct inode *inode, struct page *page, | |
712 | unsigned int offset, unsigned int bytes) | |
713 | { | |
714 | struct nfs_server *server = NFS_SERVER(inode); | |
715 | struct nfs_inode *nfsi = NFS_I(inode); | |
716 | struct nfs_page *req, *new = NULL; | |
717 | unsigned long rqend, end; | |
718 | ||
719 | end = offset + bytes; | |
720 | ||
721 | if (nfs_wait_on_write_congestion(page->mapping, server->flags & NFS_MOUNT_INTR)) | |
722 | return ERR_PTR(-ERESTARTSYS); | |
723 | for (;;) { | |
724 | /* Loop over all inode entries and see if we find | |
725 | * A request for the page we wish to update | |
726 | */ | |
727 | spin_lock(&nfsi->req_lock); | |
728 | req = _nfs_find_request(inode, page->index); | |
729 | if (req) { | |
730 | if (!nfs_lock_request_dontget(req)) { | |
731 | int error; | |
732 | spin_unlock(&nfsi->req_lock); | |
733 | error = nfs_wait_on_request(req); | |
734 | nfs_release_request(req); | |
1dd594b2 NB |
735 | if (error < 0) { |
736 | if (new) | |
737 | nfs_release_request(new); | |
1da177e4 | 738 | return ERR_PTR(error); |
1dd594b2 | 739 | } |
1da177e4 LT |
740 | continue; |
741 | } | |
742 | spin_unlock(&nfsi->req_lock); | |
743 | if (new) | |
744 | nfs_release_request(new); | |
745 | break; | |
746 | } | |
747 | ||
748 | if (new) { | |
749 | int error; | |
750 | nfs_lock_request_dontget(new); | |
751 | error = nfs_inode_add_request(inode, new); | |
752 | if (error) { | |
753 | spin_unlock(&nfsi->req_lock); | |
754 | nfs_unlock_request(new); | |
755 | return ERR_PTR(error); | |
756 | } | |
757 | spin_unlock(&nfsi->req_lock); | |
758 | nfs_mark_request_dirty(new); | |
759 | return new; | |
760 | } | |
761 | spin_unlock(&nfsi->req_lock); | |
762 | ||
763 | new = nfs_create_request(ctx, inode, page, offset, bytes); | |
764 | if (IS_ERR(new)) | |
765 | return new; | |
766 | } | |
767 | ||
768 | /* We have a request for our page. | |
769 | * If the creds don't match, or the | |
770 | * page addresses don't match, | |
771 | * tell the caller to wait on the conflicting | |
772 | * request. | |
773 | */ | |
774 | rqend = req->wb_offset + req->wb_bytes; | |
775 | if (req->wb_context != ctx | |
776 | || req->wb_page != page | |
777 | || !nfs_dirty_request(req) | |
778 | || offset > rqend || end < req->wb_offset) { | |
779 | nfs_unlock_request(req); | |
780 | return ERR_PTR(-EBUSY); | |
781 | } | |
782 | ||
783 | /* Okay, the request matches. Update the region */ | |
784 | if (offset < req->wb_offset) { | |
785 | req->wb_offset = offset; | |
786 | req->wb_pgbase = offset; | |
787 | req->wb_bytes = rqend - req->wb_offset; | |
788 | } | |
789 | ||
790 | if (end > rqend) | |
791 | req->wb_bytes = end - req->wb_offset; | |
792 | ||
793 | return req; | |
794 | } | |
795 | ||
796 | int nfs_flush_incompatible(struct file *file, struct page *page) | |
797 | { | |
798 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
799 | struct inode *inode = page->mapping->host; | |
800 | struct nfs_page *req; | |
801 | int status = 0; | |
802 | /* | |
803 | * Look for a request corresponding to this page. If there | |
804 | * is one, and it belongs to another file, we flush it out | |
805 | * before we try to copy anything into the page. Do this | |
806 | * due to the lack of an ACCESS-type call in NFSv2. | |
807 | * Also do the same if we find a request from an existing | |
808 | * dropped page. | |
809 | */ | |
810 | req = nfs_find_request(inode, page->index); | |
811 | if (req) { | |
812 | if (req->wb_page != page || ctx != req->wb_context) | |
813 | status = nfs_wb_page(inode, page); | |
814 | nfs_release_request(req); | |
815 | } | |
816 | return (status < 0) ? status : 0; | |
817 | } | |
818 | ||
819 | /* | |
820 | * Update and possibly write a cached page of an NFS file. | |
821 | * | |
822 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
823 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
824 | */ | |
825 | int nfs_updatepage(struct file *file, struct page *page, | |
826 | unsigned int offset, unsigned int count) | |
827 | { | |
828 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
1da177e4 LT |
829 | struct inode *inode = page->mapping->host; |
830 | struct nfs_page *req; | |
831 | int status = 0; | |
832 | ||
91d5b470 CL |
833 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
834 | ||
1da177e4 | 835 | dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n", |
0bbacc40 CL |
836 | file->f_dentry->d_parent->d_name.name, |
837 | file->f_dentry->d_name.name, count, | |
838 | (long long)(page_offset(page) +offset)); | |
1da177e4 LT |
839 | |
840 | if (IS_SYNC(inode)) { | |
841 | status = nfs_writepage_sync(ctx, inode, page, offset, count, 0); | |
842 | if (status > 0) { | |
843 | if (offset == 0 && status == PAGE_CACHE_SIZE) | |
844 | SetPageUptodate(page); | |
845 | return 0; | |
846 | } | |
847 | return status; | |
848 | } | |
849 | ||
850 | /* If we're not using byte range locks, and we know the page | |
851 | * is entirely in cache, it may be more efficient to avoid | |
852 | * fragmenting write requests. | |
853 | */ | |
ab0a3dbe | 854 | if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) { |
1da177e4 LT |
855 | loff_t end_offs = i_size_read(inode) - 1; |
856 | unsigned long end_index = end_offs >> PAGE_CACHE_SHIFT; | |
857 | ||
858 | count += offset; | |
859 | offset = 0; | |
860 | if (unlikely(end_offs < 0)) { | |
861 | /* Do nothing */ | |
862 | } else if (page->index == end_index) { | |
863 | unsigned int pglen; | |
864 | pglen = (unsigned int)(end_offs & (PAGE_CACHE_SIZE-1)) + 1; | |
865 | if (count < pglen) | |
866 | count = pglen; | |
867 | } else if (page->index < end_index) | |
868 | count = PAGE_CACHE_SIZE; | |
869 | } | |
870 | ||
871 | /* | |
872 | * Try to find an NFS request corresponding to this page | |
873 | * and update it. | |
874 | * If the existing request cannot be updated, we must flush | |
875 | * it out now. | |
876 | */ | |
877 | do { | |
878 | req = nfs_update_request(ctx, inode, page, offset, count); | |
879 | status = (IS_ERR(req)) ? PTR_ERR(req) : 0; | |
880 | if (status != -EBUSY) | |
881 | break; | |
882 | /* Request could not be updated. Flush it out and try again */ | |
883 | status = nfs_wb_page(inode, page); | |
884 | } while (status >= 0); | |
885 | if (status < 0) | |
886 | goto done; | |
887 | ||
888 | status = 0; | |
889 | ||
890 | /* Update file length */ | |
891 | nfs_grow_file(page, offset, count); | |
892 | /* Set the PG_uptodate flag? */ | |
893 | nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); | |
894 | nfs_unlock_request(req); | |
895 | done: | |
896 | dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n", | |
897 | status, (long long)i_size_read(inode)); | |
898 | if (status < 0) | |
899 | ClearPageUptodate(page); | |
900 | return status; | |
901 | } | |
902 | ||
903 | static void nfs_writepage_release(struct nfs_page *req) | |
904 | { | |
905 | end_page_writeback(req->wb_page); | |
906 | ||
907 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
908 | if (!PageError(req->wb_page)) { | |
909 | if (NFS_NEED_RESCHED(req)) { | |
910 | nfs_mark_request_dirty(req); | |
911 | goto out; | |
912 | } else if (NFS_NEED_COMMIT(req)) { | |
913 | nfs_mark_request_commit(req); | |
914 | goto out; | |
915 | } | |
916 | } | |
917 | nfs_inode_remove_request(req); | |
918 | ||
919 | out: | |
920 | nfs_clear_commit(req); | |
921 | nfs_clear_reschedule(req); | |
922 | #else | |
923 | nfs_inode_remove_request(req); | |
924 | #endif | |
c6a556b8 | 925 | nfs_clear_page_writeback(req); |
1da177e4 LT |
926 | } |
927 | ||
928 | static inline int flush_task_priority(int how) | |
929 | { | |
930 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
931 | case FLUSH_HIGHPRI: | |
932 | return RPC_PRIORITY_HIGH; | |
933 | case FLUSH_LOWPRI: | |
934 | return RPC_PRIORITY_LOW; | |
935 | } | |
936 | return RPC_PRIORITY_NORMAL; | |
937 | } | |
938 | ||
939 | /* | |
940 | * Set up the argument/result storage required for the RPC call. | |
941 | */ | |
942 | static void nfs_write_rpcsetup(struct nfs_page *req, | |
943 | struct nfs_write_data *data, | |
788e7a89 | 944 | const struct rpc_call_ops *call_ops, |
1da177e4 LT |
945 | unsigned int count, unsigned int offset, |
946 | int how) | |
947 | { | |
1da177e4 | 948 | struct inode *inode; |
788e7a89 | 949 | int flags; |
1da177e4 LT |
950 | |
951 | /* Set up the RPC argument and reply structs | |
952 | * NB: take care not to mess about with data->commit et al. */ | |
953 | ||
954 | data->req = req; | |
955 | data->inode = inode = req->wb_context->dentry->d_inode; | |
956 | data->cred = req->wb_context->cred; | |
957 | ||
958 | data->args.fh = NFS_FH(inode); | |
959 | data->args.offset = req_offset(req) + offset; | |
960 | data->args.pgbase = req->wb_pgbase + offset; | |
961 | data->args.pages = data->pagevec; | |
962 | data->args.count = count; | |
963 | data->args.context = req->wb_context; | |
964 | ||
965 | data->res.fattr = &data->fattr; | |
966 | data->res.count = count; | |
967 | data->res.verf = &data->verf; | |
0e574af1 | 968 | nfs_fattr_init(&data->fattr); |
1da177e4 | 969 | |
788e7a89 TM |
970 | /* Set up the initial task struct. */ |
971 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
972 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data); | |
1da177e4 LT |
973 | NFS_PROTO(inode)->write_setup(data, how); |
974 | ||
975 | data->task.tk_priority = flush_task_priority(how); | |
976 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 LT |
977 | |
978 | dprintk("NFS: %4d initiated write call (req %s/%Ld, %u bytes @ offset %Lu)\n", | |
0bbacc40 | 979 | data->task.tk_pid, |
1da177e4 LT |
980 | inode->i_sb->s_id, |
981 | (long long)NFS_FILEID(inode), | |
982 | count, | |
983 | (unsigned long long)data->args.offset); | |
984 | } | |
985 | ||
986 | static void nfs_execute_write(struct nfs_write_data *data) | |
987 | { | |
988 | struct rpc_clnt *clnt = NFS_CLIENT(data->inode); | |
989 | sigset_t oldset; | |
990 | ||
991 | rpc_clnt_sigmask(clnt, &oldset); | |
1da177e4 | 992 | rpc_execute(&data->task); |
1da177e4 LT |
993 | rpc_clnt_sigunmask(clnt, &oldset); |
994 | } | |
995 | ||
996 | /* | |
997 | * Generate multiple small requests to write out a single | |
998 | * contiguous dirty area on one page. | |
999 | */ | |
7d46a49f | 1000 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1001 | { |
1002 | struct nfs_page *req = nfs_list_entry(head->next); | |
1003 | struct page *page = req->wb_page; | |
1004 | struct nfs_write_data *data; | |
e9f7bee1 TM |
1005 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
1006 | unsigned int offset; | |
1da177e4 LT |
1007 | int requests = 0; |
1008 | LIST_HEAD(list); | |
1009 | ||
1010 | nfs_list_remove_request(req); | |
1011 | ||
1012 | nbytes = req->wb_bytes; | |
e9f7bee1 TM |
1013 | do { |
1014 | size_t len = min(nbytes, wsize); | |
1015 | ||
1016 | data = nfs_writedata_alloc(len); | |
1da177e4 LT |
1017 | if (!data) |
1018 | goto out_bad; | |
1019 | list_add(&data->pages, &list); | |
1020 | requests++; | |
e9f7bee1 TM |
1021 | nbytes -= len; |
1022 | } while (nbytes != 0); | |
1da177e4 LT |
1023 | atomic_set(&req->wb_complete, requests); |
1024 | ||
1025 | ClearPageError(page); | |
bb713d6d | 1026 | set_page_writeback(page); |
1da177e4 LT |
1027 | offset = 0; |
1028 | nbytes = req->wb_bytes; | |
1029 | do { | |
1030 | data = list_entry(list.next, struct nfs_write_data, pages); | |
1031 | list_del_init(&data->pages); | |
1032 | ||
1033 | data->pagevec[0] = page; | |
1da177e4 LT |
1034 | |
1035 | if (nbytes > wsize) { | |
788e7a89 TM |
1036 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
1037 | wsize, offset, how); | |
1da177e4 LT |
1038 | offset += wsize; |
1039 | nbytes -= wsize; | |
1040 | } else { | |
788e7a89 TM |
1041 | nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
1042 | nbytes, offset, how); | |
1da177e4 LT |
1043 | nbytes = 0; |
1044 | } | |
1045 | nfs_execute_write(data); | |
1046 | } while (nbytes != 0); | |
1047 | ||
1048 | return 0; | |
1049 | ||
1050 | out_bad: | |
1051 | while (!list_empty(&list)) { | |
1052 | data = list_entry(list.next, struct nfs_write_data, pages); | |
1053 | list_del(&data->pages); | |
8aca67f0 | 1054 | nfs_writedata_release(data); |
1da177e4 LT |
1055 | } |
1056 | nfs_mark_request_dirty(req); | |
c6a556b8 | 1057 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1058 | return -ENOMEM; |
1059 | } | |
1060 | ||
1061 | /* | |
1062 | * Create an RPC task for the given write request and kick it. | |
1063 | * The page must have been locked by the caller. | |
1064 | * | |
1065 | * It may happen that the page we're passed is not marked dirty. | |
1066 | * This is the case if nfs_updatepage detects a conflicting request | |
1067 | * that has been written but not committed. | |
1068 | */ | |
7d46a49f | 1069 | static int nfs_flush_one(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1070 | { |
1071 | struct nfs_page *req; | |
1072 | struct page **pages; | |
1073 | struct nfs_write_data *data; | |
1074 | unsigned int count; | |
1075 | ||
e9f7bee1 | 1076 | data = nfs_writedata_alloc(NFS_SERVER(inode)->wsize); |
1da177e4 LT |
1077 | if (!data) |
1078 | goto out_bad; | |
1079 | ||
1080 | pages = data->pagevec; | |
1081 | count = 0; | |
1082 | while (!list_empty(head)) { | |
1083 | req = nfs_list_entry(head->next); | |
1084 | nfs_list_remove_request(req); | |
1085 | nfs_list_add_request(req, &data->pages); | |
1086 | ClearPageError(req->wb_page); | |
bb713d6d | 1087 | set_page_writeback(req->wb_page); |
1da177e4 LT |
1088 | *pages++ = req->wb_page; |
1089 | count += req->wb_bytes; | |
1090 | } | |
1091 | req = nfs_list_entry(data->pages.next); | |
1092 | ||
1da177e4 | 1093 | /* Set up the argument struct */ |
788e7a89 | 1094 | nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 LT |
1095 | |
1096 | nfs_execute_write(data); | |
1097 | return 0; | |
1098 | out_bad: | |
1099 | while (!list_empty(head)) { | |
1100 | struct nfs_page *req = nfs_list_entry(head->next); | |
1101 | nfs_list_remove_request(req); | |
1102 | nfs_mark_request_dirty(req); | |
c6a556b8 | 1103 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1104 | } |
1105 | return -ENOMEM; | |
1106 | } | |
1107 | ||
7d46a49f | 1108 | static int nfs_flush_list(struct inode *inode, struct list_head *head, int npages, int how) |
1da177e4 LT |
1109 | { |
1110 | LIST_HEAD(one_request); | |
7d46a49f TM |
1111 | int (*flush_one)(struct inode *, struct list_head *, int); |
1112 | struct nfs_page *req; | |
1113 | int wpages = NFS_SERVER(inode)->wpages; | |
1114 | int wsize = NFS_SERVER(inode)->wsize; | |
1115 | int error; | |
1da177e4 | 1116 | |
7d46a49f TM |
1117 | flush_one = nfs_flush_one; |
1118 | if (wsize < PAGE_CACHE_SIZE) | |
1119 | flush_one = nfs_flush_multi; | |
1120 | /* For single writes, FLUSH_STABLE is more efficient */ | |
1121 | if (npages <= wpages && npages == NFS_I(inode)->npages | |
1122 | && nfs_list_entry(head->next)->wb_bytes <= wsize) | |
1123 | how |= FLUSH_STABLE; | |
1124 | ||
1125 | do { | |
1126 | nfs_coalesce_requests(head, &one_request, wpages); | |
1da177e4 | 1127 | req = nfs_list_entry(one_request.next); |
7d46a49f | 1128 | error = flush_one(inode, &one_request, how); |
1da177e4 | 1129 | if (error < 0) |
7d46a49f TM |
1130 | goto out_err; |
1131 | } while (!list_empty(head)); | |
1132 | return 0; | |
1133 | out_err: | |
1da177e4 LT |
1134 | while (!list_empty(head)) { |
1135 | req = nfs_list_entry(head->next); | |
1136 | nfs_list_remove_request(req); | |
1137 | nfs_mark_request_dirty(req); | |
c6a556b8 | 1138 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1139 | } |
1140 | return error; | |
1141 | } | |
1142 | ||
1143 | /* | |
1144 | * Handle a write reply that flushed part of a page. | |
1145 | */ | |
788e7a89 | 1146 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 1147 | { |
788e7a89 | 1148 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
1149 | struct nfs_page *req = data->req; |
1150 | struct page *page = req->wb_page; | |
1151 | ||
1152 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
1153 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1154 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1155 | req->wb_bytes, | |
1156 | (long long)req_offset(req)); | |
1157 | ||
788e7a89 TM |
1158 | if (nfs_writeback_done(task, data) != 0) |
1159 | return; | |
1160 | ||
1161 | if (task->tk_status < 0) { | |
1da177e4 LT |
1162 | ClearPageUptodate(page); |
1163 | SetPageError(page); | |
788e7a89 TM |
1164 | req->wb_context->error = task->tk_status; |
1165 | dprintk(", error = %d\n", task->tk_status); | |
1da177e4 LT |
1166 | } else { |
1167 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
1168 | if (data->verf.committed < NFS_FILE_SYNC) { | |
1169 | if (!NFS_NEED_COMMIT(req)) { | |
1170 | nfs_defer_commit(req); | |
1171 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1172 | dprintk(" defer commit\n"); | |
1173 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
1174 | nfs_defer_reschedule(req); | |
1175 | dprintk(" server reboot detected\n"); | |
1176 | } | |
1177 | } else | |
1178 | #endif | |
1179 | dprintk(" OK\n"); | |
1180 | } | |
1181 | ||
1182 | if (atomic_dec_and_test(&req->wb_complete)) | |
1183 | nfs_writepage_release(req); | |
1184 | } | |
1185 | ||
788e7a89 TM |
1186 | static const struct rpc_call_ops nfs_write_partial_ops = { |
1187 | .rpc_call_done = nfs_writeback_done_partial, | |
1188 | .rpc_release = nfs_writedata_release, | |
1189 | }; | |
1190 | ||
1da177e4 LT |
1191 | /* |
1192 | * Handle a write reply that flushes a whole page. | |
1193 | * | |
1194 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
1195 | * writebacks since the page->count is kept > 1 for as long | |
1196 | * as the page has a write request pending. | |
1197 | */ | |
788e7a89 | 1198 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 1199 | { |
788e7a89 | 1200 | struct nfs_write_data *data = calldata; |
1da177e4 LT |
1201 | struct nfs_page *req; |
1202 | struct page *page; | |
1203 | ||
788e7a89 TM |
1204 | if (nfs_writeback_done(task, data) != 0) |
1205 | return; | |
1206 | ||
1da177e4 LT |
1207 | /* Update attributes as result of writeback. */ |
1208 | while (!list_empty(&data->pages)) { | |
1209 | req = nfs_list_entry(data->pages.next); | |
1210 | nfs_list_remove_request(req); | |
1211 | page = req->wb_page; | |
1212 | ||
1213 | dprintk("NFS: write (%s/%Ld %d@%Ld)", | |
1214 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1215 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1216 | req->wb_bytes, | |
1217 | (long long)req_offset(req)); | |
1218 | ||
788e7a89 | 1219 | if (task->tk_status < 0) { |
1da177e4 LT |
1220 | ClearPageUptodate(page); |
1221 | SetPageError(page); | |
788e7a89 | 1222 | req->wb_context->error = task->tk_status; |
1da177e4 LT |
1223 | end_page_writeback(page); |
1224 | nfs_inode_remove_request(req); | |
788e7a89 | 1225 | dprintk(", error = %d\n", task->tk_status); |
1da177e4 LT |
1226 | goto next; |
1227 | } | |
1228 | end_page_writeback(page); | |
1229 | ||
1230 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
1231 | if (data->args.stable != NFS_UNSTABLE || data->verf.committed == NFS_FILE_SYNC) { | |
1232 | nfs_inode_remove_request(req); | |
1233 | dprintk(" OK\n"); | |
1234 | goto next; | |
1235 | } | |
1236 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1237 | nfs_mark_request_commit(req); | |
1238 | dprintk(" marked for commit\n"); | |
1239 | #else | |
1240 | nfs_inode_remove_request(req); | |
1241 | #endif | |
1242 | next: | |
c6a556b8 | 1243 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1244 | } |
1245 | } | |
1246 | ||
788e7a89 TM |
1247 | static const struct rpc_call_ops nfs_write_full_ops = { |
1248 | .rpc_call_done = nfs_writeback_done_full, | |
1249 | .rpc_release = nfs_writedata_release, | |
1250 | }; | |
1251 | ||
1252 | ||
1da177e4 LT |
1253 | /* |
1254 | * This function is called when the WRITE call is complete. | |
1255 | */ | |
462d5b32 | 1256 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1257 | { |
1da177e4 LT |
1258 | struct nfs_writeargs *argp = &data->args; |
1259 | struct nfs_writeres *resp = &data->res; | |
788e7a89 | 1260 | int status; |
1da177e4 LT |
1261 | |
1262 | dprintk("NFS: %4d nfs_writeback_done (status %d)\n", | |
1263 | task->tk_pid, task->tk_status); | |
1264 | ||
f551e44f CL |
1265 | /* |
1266 | * ->write_done will attempt to use post-op attributes to detect | |
1267 | * conflicting writes by other clients. A strict interpretation | |
1268 | * of close-to-open would allow us to continue caching even if | |
1269 | * another writer had changed the file, but some applications | |
1270 | * depend on tighter cache coherency when writing. | |
1271 | */ | |
788e7a89 TM |
1272 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1273 | if (status != 0) | |
1274 | return status; | |
91d5b470 CL |
1275 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1276 | ||
1da177e4 LT |
1277 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1278 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1279 | /* We tried a write call, but the server did not | |
1280 | * commit data to stable storage even though we | |
1281 | * requested it. | |
1282 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1283 | * the server reports NFS_DATA_SYNC, but performs | |
1284 | * NFS_FILE_SYNC. We therefore implement this checking | |
1285 | * as a dprintk() in order to avoid filling syslog. | |
1286 | */ | |
1287 | static unsigned long complain; | |
1288 | ||
1289 | if (time_before(complain, jiffies)) { | |
1290 | dprintk("NFS: faulty NFS server %s:" | |
1291 | " (committed = %d) != (stable = %d)\n", | |
54ceac45 | 1292 | NFS_SERVER(data->inode)->nfs_client->cl_hostname, |
1da177e4 LT |
1293 | resp->verf->committed, argp->stable); |
1294 | complain = jiffies + 300 * HZ; | |
1295 | } | |
1296 | } | |
1297 | #endif | |
1298 | /* Is this a short write? */ | |
1299 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1300 | static unsigned long complain; | |
1301 | ||
91d5b470 CL |
1302 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1303 | ||
1da177e4 LT |
1304 | /* Has the server at least made some progress? */ |
1305 | if (resp->count != 0) { | |
1306 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1307 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1308 | /* Resend from where the server left off */ | |
1309 | argp->offset += resp->count; | |
1310 | argp->pgbase += resp->count; | |
1311 | argp->count -= resp->count; | |
1312 | } else { | |
1313 | /* Resend as a stable write in order to avoid | |
1314 | * headaches in the case of a server crash. | |
1315 | */ | |
1316 | argp->stable = NFS_FILE_SYNC; | |
1317 | } | |
1318 | rpc_restart_call(task); | |
788e7a89 | 1319 | return -EAGAIN; |
1da177e4 LT |
1320 | } |
1321 | if (time_before(complain, jiffies)) { | |
1322 | printk(KERN_WARNING | |
1323 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1324 | argp->count); | |
1325 | complain = jiffies + 300 * HZ; | |
1326 | } | |
1327 | /* Can't do anything about it except throw an error. */ | |
1328 | task->tk_status = -EIO; | |
1329 | } | |
788e7a89 | 1330 | return 0; |
1da177e4 LT |
1331 | } |
1332 | ||
1333 | ||
1334 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
963d8fe5 | 1335 | void nfs_commit_release(void *wdata) |
1da177e4 | 1336 | { |
1da177e4 LT |
1337 | nfs_commit_free(wdata); |
1338 | } | |
1339 | ||
1340 | /* | |
1341 | * Set up the argument/result storage required for the RPC call. | |
1342 | */ | |
1343 | static void nfs_commit_rpcsetup(struct list_head *head, | |
788e7a89 TM |
1344 | struct nfs_write_data *data, |
1345 | int how) | |
1da177e4 | 1346 | { |
3da28eb1 | 1347 | struct nfs_page *first; |
1da177e4 | 1348 | struct inode *inode; |
788e7a89 | 1349 | int flags; |
1da177e4 LT |
1350 | |
1351 | /* Set up the RPC argument and reply structs | |
1352 | * NB: take care not to mess about with data->commit et al. */ | |
1353 | ||
1354 | list_splice_init(head, &data->pages); | |
1355 | first = nfs_list_entry(data->pages.next); | |
1da177e4 LT |
1356 | inode = first->wb_context->dentry->d_inode; |
1357 | ||
1da177e4 LT |
1358 | data->inode = inode; |
1359 | data->cred = first->wb_context->cred; | |
1360 | ||
1361 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1362 | /* Note: we always request a commit of the entire inode */ |
1363 | data->args.offset = 0; | |
1364 | data->args.count = 0; | |
1365 | data->res.count = 0; | |
1da177e4 LT |
1366 | data->res.fattr = &data->fattr; |
1367 | data->res.verf = &data->verf; | |
0e574af1 | 1368 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1369 | |
1370 | /* Set up the initial task struct. */ | |
1371 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
1372 | rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data); | |
1da177e4 LT |
1373 | NFS_PROTO(inode)->commit_setup(data, how); |
1374 | ||
1375 | data->task.tk_priority = flush_task_priority(how); | |
1376 | data->task.tk_cookie = (unsigned long)inode; | |
1da177e4 | 1377 | |
0bbacc40 | 1378 | dprintk("NFS: %4d initiated commit call\n", data->task.tk_pid); |
1da177e4 LT |
1379 | } |
1380 | ||
1381 | /* | |
1382 | * Commit dirty pages | |
1383 | */ | |
1384 | static int | |
40859d7e | 1385 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1386 | { |
1387 | struct nfs_write_data *data; | |
1388 | struct nfs_page *req; | |
1389 | ||
e9f7bee1 | 1390 | data = nfs_commit_alloc(); |
1da177e4 LT |
1391 | |
1392 | if (!data) | |
1393 | goto out_bad; | |
1394 | ||
1395 | /* Set up the argument struct */ | |
1396 | nfs_commit_rpcsetup(head, data, how); | |
1397 | ||
1398 | nfs_execute_write(data); | |
1399 | return 0; | |
1400 | out_bad: | |
1401 | while (!list_empty(head)) { | |
1402 | req = nfs_list_entry(head->next); | |
1403 | nfs_list_remove_request(req); | |
1404 | nfs_mark_request_commit(req); | |
83715ad5 | 1405 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
5c2d97cb | 1406 | nfs_clear_page_writeback(req); |
1da177e4 LT |
1407 | } |
1408 | return -ENOMEM; | |
1409 | } | |
1410 | ||
1411 | /* | |
1412 | * COMMIT call returned | |
1413 | */ | |
788e7a89 | 1414 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1415 | { |
963d8fe5 | 1416 | struct nfs_write_data *data = calldata; |
1da177e4 | 1417 | struct nfs_page *req; |
1da177e4 LT |
1418 | |
1419 | dprintk("NFS: %4d nfs_commit_done (status %d)\n", | |
1420 | task->tk_pid, task->tk_status); | |
1421 | ||
788e7a89 TM |
1422 | /* Call the NFS version-specific code */ |
1423 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1424 | return; | |
1425 | ||
1da177e4 LT |
1426 | while (!list_empty(&data->pages)) { |
1427 | req = nfs_list_entry(data->pages.next); | |
1428 | nfs_list_remove_request(req); | |
fd39fc85 | 1429 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
1da177e4 LT |
1430 | |
1431 | dprintk("NFS: commit (%s/%Ld %d@%Ld)", | |
1432 | req->wb_context->dentry->d_inode->i_sb->s_id, | |
1433 | (long long)NFS_FILEID(req->wb_context->dentry->d_inode), | |
1434 | req->wb_bytes, | |
1435 | (long long)req_offset(req)); | |
1436 | if (task->tk_status < 0) { | |
1437 | req->wb_context->error = task->tk_status; | |
1438 | nfs_inode_remove_request(req); | |
1439 | dprintk(", error = %d\n", task->tk_status); | |
1440 | goto next; | |
1441 | } | |
1442 | ||
1443 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1444 | * returned by the server against all stored verfs. */ | |
1445 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1446 | /* We have a match */ | |
1447 | nfs_inode_remove_request(req); | |
1448 | dprintk(" OK\n"); | |
1449 | goto next; | |
1450 | } | |
1451 | /* We have a mismatch. Write the page again */ | |
1452 | dprintk(" mismatch\n"); | |
1453 | nfs_mark_request_dirty(req); | |
1454 | next: | |
c6a556b8 | 1455 | nfs_clear_page_writeback(req); |
1da177e4 | 1456 | } |
1da177e4 | 1457 | } |
788e7a89 TM |
1458 | |
1459 | static const struct rpc_call_ops nfs_commit_ops = { | |
1460 | .rpc_call_done = nfs_commit_done, | |
1461 | .rpc_release = nfs_commit_release, | |
1462 | }; | |
c42de9dd TM |
1463 | #else |
1464 | static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) | |
1465 | { | |
1466 | return 0; | |
1467 | } | |
1da177e4 LT |
1468 | #endif |
1469 | ||
28c6925f | 1470 | static int nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1471 | { |
28c6925f | 1472 | struct nfs_inode *nfsi = NFS_I(mapping->host); |
1da177e4 | 1473 | LIST_HEAD(head); |
28c6925f TM |
1474 | pgoff_t index = wbc->range_start >> PAGE_CACHE_SHIFT; |
1475 | unsigned long npages = 1 + (wbc->range_end >> PAGE_CACHE_SHIFT) - index; | |
7d46a49f | 1476 | int res; |
1da177e4 LT |
1477 | |
1478 | spin_lock(&nfsi->req_lock); | |
28c6925f | 1479 | res = nfs_scan_dirty(mapping->host, &head, index, npages); |
1da177e4 | 1480 | spin_unlock(&nfsi->req_lock); |
ab0a3dbe | 1481 | if (res) { |
28c6925f | 1482 | int error = nfs_flush_list(mapping->host, &head, res, how); |
7d46a49f TM |
1483 | if (error < 0) |
1484 | return error; | |
28c6925f | 1485 | wbc->nr_to_write -= res; |
ab0a3dbe | 1486 | } |
1da177e4 LT |
1487 | return res; |
1488 | } | |
1489 | ||
1490 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
3da28eb1 | 1491 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 LT |
1492 | { |
1493 | struct nfs_inode *nfsi = NFS_I(inode); | |
1494 | LIST_HEAD(head); | |
7d46a49f | 1495 | int res; |
1da177e4 LT |
1496 | |
1497 | spin_lock(&nfsi->req_lock); | |
3da28eb1 TM |
1498 | res = nfs_scan_commit(inode, &head, 0, 0); |
1499 | spin_unlock(&nfsi->req_lock); | |
1da177e4 | 1500 | if (res) { |
7d46a49f | 1501 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1502 | if (error < 0) |
1503 | return error; | |
1504 | } | |
1da177e4 LT |
1505 | return res; |
1506 | } | |
1507 | #endif | |
1508 | ||
c42de9dd TM |
1509 | int nfs_sync_inode_wait(struct inode *inode, unsigned long idx_start, |
1510 | unsigned int npages, int how) | |
1da177e4 | 1511 | { |
c42de9dd TM |
1512 | struct nfs_inode *nfsi = NFS_I(inode); |
1513 | LIST_HEAD(head); | |
70b9ecbd | 1514 | int nocommit = how & FLUSH_NOCOMMIT; |
c42de9dd | 1515 | int pages, ret; |
1da177e4 | 1516 | |
c42de9dd TM |
1517 | how &= ~FLUSH_NOCOMMIT; |
1518 | spin_lock(&nfsi->req_lock); | |
1da177e4 | 1519 | do { |
c42de9dd TM |
1520 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); |
1521 | if (ret != 0) | |
70b9ecbd | 1522 | continue; |
c42de9dd TM |
1523 | pages = nfs_scan_dirty(inode, &head, idx_start, npages); |
1524 | if (pages != 0) { | |
1525 | spin_unlock(&nfsi->req_lock); | |
e8e058e8 | 1526 | if (how & FLUSH_INVALIDATE) { |
83715ad5 | 1527 | nfs_cancel_dirty_list(&head); |
e8e058e8 TM |
1528 | ret = pages; |
1529 | } else | |
d2ccddf0 | 1530 | ret = nfs_flush_list(inode, &head, pages, how); |
c42de9dd TM |
1531 | spin_lock(&nfsi->req_lock); |
1532 | continue; | |
1533 | } | |
1534 | if (nocommit) | |
1535 | break; | |
d2ccddf0 | 1536 | pages = nfs_scan_commit(inode, &head, idx_start, npages); |
c42de9dd TM |
1537 | if (pages == 0) |
1538 | break; | |
d2ccddf0 TM |
1539 | if (how & FLUSH_INVALIDATE) { |
1540 | spin_unlock(&nfsi->req_lock); | |
83715ad5 | 1541 | nfs_cancel_commit_list(&head); |
e8e058e8 | 1542 | ret = pages; |
d2ccddf0 TM |
1543 | spin_lock(&nfsi->req_lock); |
1544 | continue; | |
1545 | } | |
1546 | pages += nfs_scan_commit(inode, &head, 0, 0); | |
c42de9dd TM |
1547 | spin_unlock(&nfsi->req_lock); |
1548 | ret = nfs_commit_list(inode, &head, how); | |
1549 | spin_lock(&nfsi->req_lock); | |
1550 | } while (ret >= 0); | |
1551 | spin_unlock(&nfsi->req_lock); | |
1552 | return ret; | |
1da177e4 LT |
1553 | } |
1554 | ||
f7b422b1 | 1555 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1556 | { |
1557 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1558 | sizeof(struct nfs_write_data), | |
1559 | 0, SLAB_HWCACHE_ALIGN, | |
1560 | NULL, NULL); | |
1561 | if (nfs_wdata_cachep == NULL) | |
1562 | return -ENOMEM; | |
1563 | ||
93d2341c MD |
1564 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1565 | nfs_wdata_cachep); | |
1da177e4 LT |
1566 | if (nfs_wdata_mempool == NULL) |
1567 | return -ENOMEM; | |
1568 | ||
93d2341c MD |
1569 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1570 | nfs_wdata_cachep); | |
1da177e4 LT |
1571 | if (nfs_commit_mempool == NULL) |
1572 | return -ENOMEM; | |
1573 | ||
1574 | return 0; | |
1575 | } | |
1576 | ||
266bee88 | 1577 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1578 | { |
1579 | mempool_destroy(nfs_commit_mempool); | |
1580 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1581 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1582 | } |
1583 |