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Commit | Line | Data |
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08e0e7c8 | 1 | /* AFS filesystem file handling |
1da177e4 | 2 | * |
08e0e7c8 | 3 | * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved. |
1da177e4 LT |
4 | * Written by David Howells (dhowells@redhat.com) |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
1da177e4 LT |
15 | #include <linux/fs.h> |
16 | #include <linux/pagemap.h> | |
31143d5d | 17 | #include <linux/writeback.h> |
5a0e3ad6 | 18 | #include <linux/gfp.h> |
91b467e0 | 19 | #include <linux/task_io_accounting_ops.h> |
1da177e4 LT |
20 | #include "internal.h" |
21 | ||
416351f2 | 22 | static int afs_readpage(struct file *file, struct page *page); |
d47992f8 LC |
23 | static void afs_invalidatepage(struct page *page, unsigned int offset, |
24 | unsigned int length); | |
416351f2 | 25 | static int afs_releasepage(struct page *page, gfp_t gfp_flags); |
31143d5d | 26 | static int afs_launder_page(struct page *page); |
1da177e4 | 27 | |
9b3f26c9 DH |
28 | static int afs_readpages(struct file *filp, struct address_space *mapping, |
29 | struct list_head *pages, unsigned nr_pages); | |
30 | ||
00d3b7a4 DH |
31 | const struct file_operations afs_file_operations = { |
32 | .open = afs_open, | |
58fed94d | 33 | .flush = afs_flush, |
00d3b7a4 DH |
34 | .release = afs_release, |
35 | .llseek = generic_file_llseek, | |
aad4f8bb | 36 | .read_iter = generic_file_read_iter, |
50b5551d | 37 | .write_iter = afs_file_write, |
00d3b7a4 | 38 | .mmap = generic_file_readonly_mmap, |
5ffc4ef4 | 39 | .splice_read = generic_file_splice_read, |
31143d5d | 40 | .fsync = afs_fsync, |
e8d6c554 DH |
41 | .lock = afs_lock, |
42 | .flock = afs_flock, | |
00d3b7a4 DH |
43 | }; |
44 | ||
754661f1 | 45 | const struct inode_operations afs_file_inode_operations = { |
416351f2 | 46 | .getattr = afs_getattr, |
31143d5d | 47 | .setattr = afs_setattr, |
00d3b7a4 | 48 | .permission = afs_permission, |
d3e3b7ea | 49 | .listxattr = afs_listxattr, |
1da177e4 LT |
50 | }; |
51 | ||
f5e54d6e | 52 | const struct address_space_operations afs_fs_aops = { |
416351f2 | 53 | .readpage = afs_readpage, |
9b3f26c9 | 54 | .readpages = afs_readpages, |
31143d5d DH |
55 | .set_page_dirty = afs_set_page_dirty, |
56 | .launder_page = afs_launder_page, | |
416351f2 DH |
57 | .releasepage = afs_releasepage, |
58 | .invalidatepage = afs_invalidatepage, | |
15b4650e NP |
59 | .write_begin = afs_write_begin, |
60 | .write_end = afs_write_end, | |
31143d5d DH |
61 | .writepage = afs_writepage, |
62 | .writepages = afs_writepages, | |
1da177e4 LT |
63 | }; |
64 | ||
00d3b7a4 DH |
65 | /* |
66 | * open an AFS file or directory and attach a key to it | |
67 | */ | |
68 | int afs_open(struct inode *inode, struct file *file) | |
69 | { | |
70 | struct afs_vnode *vnode = AFS_FS_I(inode); | |
71 | struct key *key; | |
260a9803 | 72 | int ret; |
00d3b7a4 | 73 | |
416351f2 | 74 | _enter("{%x:%u},", vnode->fid.vid, vnode->fid.vnode); |
00d3b7a4 DH |
75 | |
76 | key = afs_request_key(vnode->volume->cell); | |
77 | if (IS_ERR(key)) { | |
78 | _leave(" = %ld [key]", PTR_ERR(key)); | |
79 | return PTR_ERR(key); | |
80 | } | |
81 | ||
260a9803 DH |
82 | ret = afs_validate(vnode, key); |
83 | if (ret < 0) { | |
84 | _leave(" = %d [val]", ret); | |
85 | return ret; | |
86 | } | |
87 | ||
00d3b7a4 DH |
88 | file->private_data = key; |
89 | _leave(" = 0"); | |
90 | return 0; | |
91 | } | |
92 | ||
93 | /* | |
94 | * release an AFS file or directory and discard its key | |
95 | */ | |
96 | int afs_release(struct inode *inode, struct file *file) | |
97 | { | |
98 | struct afs_vnode *vnode = AFS_FS_I(inode); | |
99 | ||
416351f2 | 100 | _enter("{%x:%u},", vnode->fid.vid, vnode->fid.vnode); |
00d3b7a4 DH |
101 | |
102 | key_put(file->private_data); | |
103 | _leave(" = 0"); | |
104 | return 0; | |
105 | } | |
106 | ||
196ee9cd DH |
107 | /* |
108 | * Dispose of a ref to a read record. | |
109 | */ | |
110 | void afs_put_read(struct afs_read *req) | |
111 | { | |
112 | int i; | |
113 | ||
114 | if (atomic_dec_and_test(&req->usage)) { | |
115 | for (i = 0; i < req->nr_pages; i++) | |
116 | if (req->pages[i]) | |
117 | put_page(req->pages[i]); | |
118 | kfree(req); | |
119 | } | |
120 | } | |
121 | ||
6566abdb | 122 | #ifdef CONFIG_AFS_FSCACHE |
1da177e4 LT |
123 | /* |
124 | * deal with notification that a page was read from the cache | |
125 | */ | |
9b3f26c9 DH |
126 | static void afs_file_readpage_read_complete(struct page *page, |
127 | void *data, | |
128 | int error) | |
1da177e4 | 129 | { |
9b3f26c9 | 130 | _enter("%p,%p,%d", page, data, error); |
1da177e4 | 131 | |
9b3f26c9 DH |
132 | /* if the read completes with an error, we just unlock the page and let |
133 | * the VM reissue the readpage */ | |
134 | if (!error) | |
1da177e4 LT |
135 | SetPageUptodate(page); |
136 | unlock_page(page); | |
ec26815a | 137 | } |
6566abdb | 138 | #endif |
1da177e4 | 139 | |
d2ddc776 DH |
140 | /* |
141 | * Fetch file data from the volume. | |
142 | */ | |
143 | int afs_fetch_data(struct afs_vnode *vnode, struct key *key, struct afs_read *desc) | |
144 | { | |
145 | struct afs_fs_cursor fc; | |
146 | int ret; | |
147 | ||
148 | _enter("%s{%x:%u.%u},%x,,,", | |
149 | vnode->volume->name, | |
150 | vnode->fid.vid, | |
151 | vnode->fid.vnode, | |
152 | vnode->fid.unique, | |
153 | key_serial(key)); | |
154 | ||
155 | ret = -ERESTARTSYS; | |
156 | if (afs_begin_vnode_operation(&fc, vnode, key)) { | |
157 | while (afs_select_fileserver(&fc)) { | |
158 | fc.cb_break = vnode->cb_break + vnode->cb_s_break; | |
159 | afs_fs_fetch_data(&fc, desc); | |
160 | } | |
161 | ||
162 | afs_check_for_remote_deletion(&fc, fc.vnode); | |
163 | afs_vnode_commit_status(&fc, vnode, fc.cb_break); | |
164 | ret = afs_end_vnode_operation(&fc); | |
165 | } | |
166 | ||
167 | _leave(" = %d", ret); | |
168 | return ret; | |
169 | } | |
170 | ||
1da177e4 | 171 | /* |
f6d335c0 | 172 | * read page from file, directory or symlink, given a key to use |
1da177e4 | 173 | */ |
f6d335c0 | 174 | int afs_page_filler(void *data, struct page *page) |
1da177e4 | 175 | { |
f6d335c0 AV |
176 | struct inode *inode = page->mapping->host; |
177 | struct afs_vnode *vnode = AFS_FS_I(inode); | |
196ee9cd | 178 | struct afs_read *req; |
f6d335c0 | 179 | struct key *key = data; |
1da177e4 LT |
180 | int ret; |
181 | ||
00d3b7a4 | 182 | _enter("{%x},{%lu},{%lu}", key_serial(key), inode->i_ino, page->index); |
1da177e4 | 183 | |
cd7619d6 | 184 | BUG_ON(!PageLocked(page)); |
1da177e4 LT |
185 | |
186 | ret = -ESTALE; | |
08e0e7c8 | 187 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) |
1da177e4 LT |
188 | goto error; |
189 | ||
1da177e4 | 190 | /* is it cached? */ |
9b3f26c9 DH |
191 | #ifdef CONFIG_AFS_FSCACHE |
192 | ret = fscache_read_or_alloc_page(vnode->cache, | |
1da177e4 LT |
193 | page, |
194 | afs_file_readpage_read_complete, | |
195 | NULL, | |
196 | GFP_KERNEL); | |
197 | #else | |
198 | ret = -ENOBUFS; | |
199 | #endif | |
1da177e4 | 200 | switch (ret) { |
1da177e4 LT |
201 | /* read BIO submitted (page in cache) */ |
202 | case 0: | |
203 | break; | |
204 | ||
9b3f26c9 | 205 | /* page not yet cached */ |
1da177e4 | 206 | case -ENODATA: |
9b3f26c9 DH |
207 | _debug("cache said ENODATA"); |
208 | goto go_on; | |
209 | ||
210 | /* page will not be cached */ | |
211 | case -ENOBUFS: | |
212 | _debug("cache said ENOBUFS"); | |
1da177e4 | 213 | default: |
9b3f26c9 | 214 | go_on: |
196ee9cd DH |
215 | req = kzalloc(sizeof(struct afs_read) + sizeof(struct page *), |
216 | GFP_KERNEL); | |
217 | if (!req) | |
218 | goto enomem; | |
219 | ||
6db3ac3c DH |
220 | /* We request a full page. If the page is a partial one at the |
221 | * end of the file, the server will return a short read and the | |
222 | * unmarshalling code will clear the unfilled space. | |
223 | */ | |
196ee9cd DH |
224 | atomic_set(&req->usage, 1); |
225 | req->pos = (loff_t)page->index << PAGE_SHIFT; | |
6db3ac3c | 226 | req->len = PAGE_SIZE; |
196ee9cd DH |
227 | req->nr_pages = 1; |
228 | req->pages[0] = page; | |
229 | get_page(page); | |
1da177e4 LT |
230 | |
231 | /* read the contents of the file from the server into the | |
232 | * page */ | |
d2ddc776 | 233 | ret = afs_fetch_data(vnode, key, req); |
196ee9cd | 234 | afs_put_read(req); |
1da177e4 | 235 | if (ret < 0) { |
08e0e7c8 | 236 | if (ret == -ENOENT) { |
1da177e4 LT |
237 | _debug("got NOENT from server" |
238 | " - marking file deleted and stale"); | |
08e0e7c8 | 239 | set_bit(AFS_VNODE_DELETED, &vnode->flags); |
1da177e4 LT |
240 | ret = -ESTALE; |
241 | } | |
9b3f26c9 DH |
242 | |
243 | #ifdef CONFIG_AFS_FSCACHE | |
244 | fscache_uncache_page(vnode->cache, page); | |
1da177e4 | 245 | #endif |
9b3f26c9 | 246 | BUG_ON(PageFsCache(page)); |
68ae849d DH |
247 | |
248 | if (ret == -EINTR || | |
249 | ret == -ENOMEM || | |
250 | ret == -ERESTARTSYS || | |
251 | ret == -EAGAIN) | |
252 | goto error; | |
253 | goto io_error; | |
1da177e4 LT |
254 | } |
255 | ||
256 | SetPageUptodate(page); | |
257 | ||
9b3f26c9 DH |
258 | /* send the page to the cache */ |
259 | #ifdef CONFIG_AFS_FSCACHE | |
260 | if (PageFsCache(page) && | |
261 | fscache_write_page(vnode->cache, page, GFP_KERNEL) != 0) { | |
262 | fscache_uncache_page(vnode->cache, page); | |
263 | BUG_ON(PageFsCache(page)); | |
1da177e4 | 264 | } |
1da177e4 | 265 | #endif |
9b3f26c9 | 266 | unlock_page(page); |
1da177e4 LT |
267 | } |
268 | ||
269 | _leave(" = 0"); | |
270 | return 0; | |
271 | ||
68ae849d DH |
272 | io_error: |
273 | SetPageError(page); | |
274 | goto error; | |
196ee9cd DH |
275 | enomem: |
276 | ret = -ENOMEM; | |
08e0e7c8 | 277 | error: |
1da177e4 | 278 | unlock_page(page); |
1da177e4 LT |
279 | _leave(" = %d", ret); |
280 | return ret; | |
ec26815a | 281 | } |
1da177e4 | 282 | |
f6d335c0 AV |
283 | /* |
284 | * read page from file, directory or symlink, given a file to nominate the key | |
285 | * to be used | |
286 | */ | |
287 | static int afs_readpage(struct file *file, struct page *page) | |
288 | { | |
289 | struct key *key; | |
290 | int ret; | |
291 | ||
292 | if (file) { | |
293 | key = file->private_data; | |
294 | ASSERT(key != NULL); | |
295 | ret = afs_page_filler(key, page); | |
296 | } else { | |
297 | struct inode *inode = page->mapping->host; | |
d2ddc776 | 298 | key = afs_request_key(AFS_FS_S(inode->i_sb)->cell); |
f6d335c0 AV |
299 | if (IS_ERR(key)) { |
300 | ret = PTR_ERR(key); | |
301 | } else { | |
302 | ret = afs_page_filler(key, page); | |
303 | key_put(key); | |
304 | } | |
305 | } | |
306 | return ret; | |
307 | } | |
308 | ||
91b467e0 DH |
309 | /* |
310 | * Make pages available as they're filled. | |
311 | */ | |
312 | static void afs_readpages_page_done(struct afs_call *call, struct afs_read *req) | |
313 | { | |
51c89e6a | 314 | #ifdef CONFIG_AFS_FSCACHE |
97e3043a | 315 | struct afs_vnode *vnode = call->reply[0]; |
51c89e6a | 316 | #endif |
91b467e0 DH |
317 | struct page *page = req->pages[req->index]; |
318 | ||
319 | req->pages[req->index] = NULL; | |
320 | SetPageUptodate(page); | |
321 | ||
322 | /* send the page to the cache */ | |
323 | #ifdef CONFIG_AFS_FSCACHE | |
324 | if (PageFsCache(page) && | |
325 | fscache_write_page(vnode->cache, page, GFP_KERNEL) != 0) { | |
326 | fscache_uncache_page(vnode->cache, page); | |
327 | BUG_ON(PageFsCache(page)); | |
328 | } | |
329 | #endif | |
330 | unlock_page(page); | |
331 | put_page(page); | |
332 | } | |
333 | ||
334 | /* | |
335 | * Read a contiguous set of pages. | |
336 | */ | |
337 | static int afs_readpages_one(struct file *file, struct address_space *mapping, | |
338 | struct list_head *pages) | |
339 | { | |
340 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); | |
341 | struct afs_read *req; | |
342 | struct list_head *p; | |
343 | struct page *first, *page; | |
344 | struct key *key = file->private_data; | |
345 | pgoff_t index; | |
346 | int ret, n, i; | |
347 | ||
348 | /* Count the number of contiguous pages at the front of the list. Note | |
349 | * that the list goes prev-wards rather than next-wards. | |
350 | */ | |
351 | first = list_entry(pages->prev, struct page, lru); | |
352 | index = first->index + 1; | |
353 | n = 1; | |
354 | for (p = first->lru.prev; p != pages; p = p->prev) { | |
355 | page = list_entry(p, struct page, lru); | |
356 | if (page->index != index) | |
357 | break; | |
358 | index++; | |
359 | n++; | |
360 | } | |
361 | ||
362 | req = kzalloc(sizeof(struct afs_read) + sizeof(struct page *) * n, | |
363 | GFP_NOFS); | |
364 | if (!req) | |
365 | return -ENOMEM; | |
366 | ||
367 | atomic_set(&req->usage, 1); | |
368 | req->page_done = afs_readpages_page_done; | |
369 | req->pos = first->index; | |
370 | req->pos <<= PAGE_SHIFT; | |
371 | ||
372 | /* Transfer the pages to the request. We add them in until one fails | |
373 | * to add to the LRU and then we stop (as that'll make a hole in the | |
374 | * contiguous run. | |
375 | * | |
376 | * Note that it's possible for the file size to change whilst we're | |
377 | * doing this, but we rely on the server returning less than we asked | |
378 | * for if the file shrank. We also rely on this to deal with a partial | |
379 | * page at the end of the file. | |
380 | */ | |
381 | do { | |
382 | page = list_entry(pages->prev, struct page, lru); | |
383 | list_del(&page->lru); | |
384 | index = page->index; | |
385 | if (add_to_page_cache_lru(page, mapping, index, | |
386 | readahead_gfp_mask(mapping))) { | |
387 | #ifdef CONFIG_AFS_FSCACHE | |
388 | fscache_uncache_page(vnode->cache, page); | |
389 | #endif | |
390 | put_page(page); | |
391 | break; | |
392 | } | |
393 | ||
394 | req->pages[req->nr_pages++] = page; | |
395 | req->len += PAGE_SIZE; | |
396 | } while (req->nr_pages < n); | |
397 | ||
398 | if (req->nr_pages == 0) { | |
399 | kfree(req); | |
400 | return 0; | |
401 | } | |
402 | ||
d2ddc776 | 403 | ret = afs_fetch_data(vnode, key, req); |
91b467e0 DH |
404 | if (ret < 0) |
405 | goto error; | |
406 | ||
407 | task_io_account_read(PAGE_SIZE * req->nr_pages); | |
408 | afs_put_read(req); | |
409 | return 0; | |
410 | ||
411 | error: | |
412 | if (ret == -ENOENT) { | |
413 | _debug("got NOENT from server" | |
414 | " - marking file deleted and stale"); | |
415 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
416 | ret = -ESTALE; | |
417 | } | |
418 | ||
419 | for (i = 0; i < req->nr_pages; i++) { | |
420 | page = req->pages[i]; | |
421 | if (page) { | |
422 | #ifdef CONFIG_AFS_FSCACHE | |
423 | fscache_uncache_page(vnode->cache, page); | |
424 | #endif | |
425 | SetPageError(page); | |
426 | unlock_page(page); | |
427 | } | |
428 | } | |
429 | ||
430 | afs_put_read(req); | |
431 | return ret; | |
432 | } | |
433 | ||
1da177e4 | 434 | /* |
9b3f26c9 | 435 | * read a set of pages |
1da177e4 | 436 | */ |
9b3f26c9 DH |
437 | static int afs_readpages(struct file *file, struct address_space *mapping, |
438 | struct list_head *pages, unsigned nr_pages) | |
1da177e4 | 439 | { |
f6d335c0 | 440 | struct key *key = file->private_data; |
9b3f26c9 DH |
441 | struct afs_vnode *vnode; |
442 | int ret = 0; | |
1da177e4 | 443 | |
f6d335c0 AV |
444 | _enter("{%d},{%lu},,%d", |
445 | key_serial(key), mapping->host->i_ino, nr_pages); | |
446 | ||
447 | ASSERT(key != NULL); | |
1da177e4 | 448 | |
9b3f26c9 | 449 | vnode = AFS_FS_I(mapping->host); |
ad2a8e60 | 450 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { |
9b3f26c9 DH |
451 | _leave(" = -ESTALE"); |
452 | return -ESTALE; | |
453 | } | |
1da177e4 | 454 | |
9b3f26c9 DH |
455 | /* attempt to read as many of the pages as possible */ |
456 | #ifdef CONFIG_AFS_FSCACHE | |
457 | ret = fscache_read_or_alloc_pages(vnode->cache, | |
458 | mapping, | |
459 | pages, | |
460 | &nr_pages, | |
461 | afs_file_readpage_read_complete, | |
462 | NULL, | |
463 | mapping_gfp_mask(mapping)); | |
464 | #else | |
465 | ret = -ENOBUFS; | |
466 | #endif | |
467 | ||
468 | switch (ret) { | |
469 | /* all pages are being read from the cache */ | |
470 | case 0: | |
471 | BUG_ON(!list_empty(pages)); | |
472 | BUG_ON(nr_pages != 0); | |
473 | _leave(" = 0 [reading all]"); | |
474 | return 0; | |
475 | ||
476 | /* there were pages that couldn't be read from the cache */ | |
477 | case -ENODATA: | |
478 | case -ENOBUFS: | |
479 | break; | |
480 | ||
481 | /* other error */ | |
482 | default: | |
483 | _leave(" = %d", ret); | |
484 | return ret; | |
1da177e4 LT |
485 | } |
486 | ||
91b467e0 DH |
487 | while (!list_empty(pages)) { |
488 | ret = afs_readpages_one(file, mapping, pages); | |
489 | if (ret < 0) | |
490 | break; | |
491 | } | |
9b3f26c9 DH |
492 | |
493 | _leave(" = %d [netting]", ret); | |
494 | return ret; | |
ec26815a | 495 | } |
1da177e4 | 496 | |
31143d5d DH |
497 | /* |
498 | * write back a dirty page | |
499 | */ | |
500 | static int afs_launder_page(struct page *page) | |
501 | { | |
502 | _enter("{%lu}", page->index); | |
503 | ||
504 | return 0; | |
505 | } | |
506 | ||
1da177e4 | 507 | /* |
9b3f26c9 DH |
508 | * invalidate part or all of a page |
509 | * - release a page and clean up its private data if offset is 0 (indicating | |
510 | * the entire page) | |
511 | */ | |
d47992f8 LC |
512 | static void afs_invalidatepage(struct page *page, unsigned int offset, |
513 | unsigned int length) | |
9b3f26c9 DH |
514 | { |
515 | struct afs_writeback *wb = (struct afs_writeback *) page_private(page); | |
516 | ||
d47992f8 | 517 | _enter("{%lu},%u,%u", page->index, offset, length); |
9b3f26c9 DH |
518 | |
519 | BUG_ON(!PageLocked(page)); | |
520 | ||
521 | /* we clean up only if the entire page is being invalidated */ | |
09cbfeaf | 522 | if (offset == 0 && length == PAGE_SIZE) { |
9b3f26c9 DH |
523 | #ifdef CONFIG_AFS_FSCACHE |
524 | if (PageFsCache(page)) { | |
525 | struct afs_vnode *vnode = AFS_FS_I(page->mapping->host); | |
526 | fscache_wait_on_page_write(vnode->cache, page); | |
527 | fscache_uncache_page(vnode->cache, page); | |
9b3f26c9 DH |
528 | } |
529 | #endif | |
530 | ||
531 | if (PagePrivate(page)) { | |
532 | if (wb && !PageWriteback(page)) { | |
533 | set_page_private(page, 0); | |
534 | afs_put_writeback(wb); | |
535 | } | |
536 | ||
537 | if (!page_private(page)) | |
538 | ClearPagePrivate(page); | |
539 | } | |
540 | } | |
541 | ||
542 | _leave(""); | |
543 | } | |
544 | ||
545 | /* | |
546 | * release a page and clean up its private state if it's not busy | |
547 | * - return true if the page can now be released, false if not | |
1da177e4 | 548 | */ |
416351f2 | 549 | static int afs_releasepage(struct page *page, gfp_t gfp_flags) |
1da177e4 | 550 | { |
9b3f26c9 | 551 | struct afs_writeback *wb = (struct afs_writeback *) page_private(page); |
416351f2 | 552 | struct afs_vnode *vnode = AFS_FS_I(page->mapping->host); |
1da177e4 | 553 | |
416351f2 DH |
554 | _enter("{{%x:%u}[%lu],%lx},%x", |
555 | vnode->fid.vid, vnode->fid.vnode, page->index, page->flags, | |
556 | gfp_flags); | |
1da177e4 | 557 | |
9b3f26c9 DH |
558 | /* deny if page is being written to the cache and the caller hasn't |
559 | * elected to wait */ | |
560 | #ifdef CONFIG_AFS_FSCACHE | |
201a1542 DH |
561 | if (!fscache_maybe_release_page(vnode->cache, page, gfp_flags)) { |
562 | _leave(" = F [cache busy]"); | |
563 | return 0; | |
9b3f26c9 DH |
564 | } |
565 | #endif | |
566 | ||
1da177e4 | 567 | if (PagePrivate(page)) { |
9b3f26c9 DH |
568 | if (wb) { |
569 | set_page_private(page, 0); | |
570 | afs_put_writeback(wb); | |
571 | } | |
1da177e4 | 572 | ClearPagePrivate(page); |
1da177e4 LT |
573 | } |
574 | ||
9b3f26c9 DH |
575 | /* indicate that the page can be released */ |
576 | _leave(" = T"); | |
577 | return 1; | |
ec26815a | 578 | } |