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Commit | Line | Data |
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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
7eabb77e | 3 | * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
4 | * |
5 | * This copyrighted material is made available to anyone wishing to use, | |
6 | * modify, copy, or redistribute it subject to the terms and conditions | |
e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
b3b94faa DT |
8 | */ |
9 | ||
10 | #include <linux/sched.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/completion.h> | |
14 | #include <linux/buffer_head.h> | |
15 | #include <linux/pagemap.h> | |
fd88de56 | 16 | #include <linux/pagevec.h> |
9b124fbb | 17 | #include <linux/mpage.h> |
d1665e41 | 18 | #include <linux/fs.h> |
a8d638e3 | 19 | #include <linux/writeback.h> |
7765ec26 | 20 | #include <linux/swap.h> |
5c676f6d | 21 | #include <linux/gfs2_ondisk.h> |
7d308590 | 22 | #include <linux/lm_interface.h> |
47e83b50 | 23 | #include <linux/backing-dev.h> |
b3b94faa DT |
24 | |
25 | #include "gfs2.h" | |
5c676f6d | 26 | #include "incore.h" |
b3b94faa DT |
27 | #include "bmap.h" |
28 | #include "glock.h" | |
29 | #include "inode.h" | |
b3b94faa DT |
30 | #include "log.h" |
31 | #include "meta_io.h" | |
32 | #include "ops_address.h" | |
b3b94faa DT |
33 | #include "quota.h" |
34 | #include "trans.h" | |
18ec7d5c | 35 | #include "rgrp.h" |
cd81a4ba | 36 | #include "super.h" |
5c676f6d | 37 | #include "util.h" |
4340fe62 | 38 | #include "glops.h" |
b3b94faa | 39 | |
ba7f7290 SW |
40 | |
41 | static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page, | |
42 | unsigned int from, unsigned int to) | |
43 | { | |
44 | struct buffer_head *head = page_buffers(page); | |
45 | unsigned int bsize = head->b_size; | |
46 | struct buffer_head *bh; | |
47 | unsigned int start, end; | |
48 | ||
49 | for (bh = head, start = 0; bh != head || !start; | |
50 | bh = bh->b_this_page, start = end) { | |
51 | end = start + bsize; | |
52 | if (end <= from || start >= to) | |
53 | continue; | |
ddf4b426 BM |
54 | if (gfs2_is_jdata(ip)) |
55 | set_buffer_uptodate(bh); | |
ba7f7290 SW |
56 | gfs2_trans_add_bh(ip->i_gl, bh, 0); |
57 | } | |
58 | } | |
59 | ||
b3b94faa | 60 | /** |
7a6bbacb | 61 | * gfs2_get_block_noalloc - Fills in a buffer head with details about a block |
b3b94faa DT |
62 | * @inode: The inode |
63 | * @lblock: The block number to look up | |
64 | * @bh_result: The buffer head to return the result in | |
65 | * @create: Non-zero if we may add block to the file | |
66 | * | |
67 | * Returns: errno | |
68 | */ | |
69 | ||
7a6bbacb SW |
70 | static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock, |
71 | struct buffer_head *bh_result, int create) | |
b3b94faa | 72 | { |
b3b94faa DT |
73 | int error; |
74 | ||
e9e1ef2b | 75 | error = gfs2_block_map(inode, lblock, bh_result, 0); |
b3b94faa DT |
76 | if (error) |
77 | return error; | |
de986e85 | 78 | if (!buffer_mapped(bh_result)) |
7a6bbacb SW |
79 | return -EIO; |
80 | return 0; | |
b3b94faa DT |
81 | } |
82 | ||
7a6bbacb SW |
83 | static int gfs2_get_block_direct(struct inode *inode, sector_t lblock, |
84 | struct buffer_head *bh_result, int create) | |
623d9355 | 85 | { |
e9e1ef2b | 86 | return gfs2_block_map(inode, lblock, bh_result, 0); |
623d9355 | 87 | } |
7a6bbacb | 88 | |
b3b94faa | 89 | /** |
9ff8ec32 SW |
90 | * gfs2_writepage_common - Common bits of writepage |
91 | * @page: The page to be written | |
92 | * @wbc: The writeback control | |
b3b94faa | 93 | * |
9ff8ec32 | 94 | * Returns: 1 if writepage is ok, otherwise an error code or zero if no error. |
b3b94faa DT |
95 | */ |
96 | ||
9ff8ec32 SW |
97 | static int gfs2_writepage_common(struct page *page, |
98 | struct writeback_control *wbc) | |
b3b94faa | 99 | { |
18ec7d5c | 100 | struct inode *inode = page->mapping->host; |
f4387149 SW |
101 | struct gfs2_inode *ip = GFS2_I(inode); |
102 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
18ec7d5c SW |
103 | loff_t i_size = i_size_read(inode); |
104 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
105 | unsigned offset; | |
b3b94faa | 106 | |
9ff8ec32 SW |
107 | if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) |
108 | goto out; | |
5c676f6d | 109 | if (current->journal_info) |
9ff8ec32 | 110 | goto redirty; |
18ec7d5c | 111 | /* Is the page fully outside i_size? (truncate in progress) */ |
9ff8ec32 | 112 | offset = i_size & (PAGE_CACHE_SIZE-1); |
d2d7b8a2 | 113 | if (page->index > end_index || (page->index == end_index && !offset)) { |
18ec7d5c | 114 | page->mapping->a_ops->invalidatepage(page, 0); |
9ff8ec32 | 115 | goto out; |
b3b94faa | 116 | } |
9ff8ec32 SW |
117 | return 1; |
118 | redirty: | |
119 | redirty_page_for_writepage(wbc, page); | |
120 | out: | |
121 | unlock_page(page); | |
122 | return 0; | |
123 | } | |
124 | ||
125 | /** | |
126 | * gfs2_writeback_writepage - Write page for writeback mappings | |
127 | * @page: The page | |
128 | * @wbc: The writeback control | |
129 | * | |
130 | */ | |
131 | ||
132 | static int gfs2_writeback_writepage(struct page *page, | |
133 | struct writeback_control *wbc) | |
134 | { | |
135 | int ret; | |
136 | ||
137 | ret = gfs2_writepage_common(page, wbc); | |
138 | if (ret <= 0) | |
139 | return ret; | |
140 | ||
141 | ret = mpage_writepage(page, gfs2_get_block_noalloc, wbc); | |
142 | if (ret == -EAGAIN) | |
143 | ret = block_write_full_page(page, gfs2_get_block_noalloc, wbc); | |
144 | return ret; | |
145 | } | |
146 | ||
147 | /** | |
148 | * gfs2_ordered_writepage - Write page for ordered data files | |
149 | * @page: The page to write | |
150 | * @wbc: The writeback control | |
151 | * | |
152 | */ | |
153 | ||
154 | static int gfs2_ordered_writepage(struct page *page, | |
155 | struct writeback_control *wbc) | |
156 | { | |
157 | struct inode *inode = page->mapping->host; | |
158 | struct gfs2_inode *ip = GFS2_I(inode); | |
159 | int ret; | |
160 | ||
161 | ret = gfs2_writepage_common(page, wbc); | |
162 | if (ret <= 0) | |
163 | return ret; | |
164 | ||
165 | if (!page_has_buffers(page)) { | |
166 | create_empty_buffers(page, inode->i_sb->s_blocksize, | |
167 | (1 << BH_Dirty)|(1 << BH_Uptodate)); | |
168 | } | |
169 | gfs2_page_add_databufs(ip, page, 0, inode->i_sb->s_blocksize-1); | |
170 | return block_write_full_page(page, gfs2_get_block_noalloc, wbc); | |
171 | } | |
172 | ||
b8e7cbb6 SW |
173 | /** |
174 | * __gfs2_jdata_writepage - The core of jdata writepage | |
175 | * @page: The page to write | |
176 | * @wbc: The writeback control | |
177 | * | |
178 | * This is shared between writepage and writepages and implements the | |
179 | * core of the writepage operation. If a transaction is required then | |
180 | * PageChecked will have been set and the transaction will have | |
181 | * already been started before this is called. | |
182 | */ | |
183 | ||
184 | static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) | |
185 | { | |
186 | struct inode *inode = page->mapping->host; | |
187 | struct gfs2_inode *ip = GFS2_I(inode); | |
188 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
189 | ||
190 | if (PageChecked(page)) { | |
191 | ClearPageChecked(page); | |
192 | if (!page_has_buffers(page)) { | |
193 | create_empty_buffers(page, inode->i_sb->s_blocksize, | |
194 | (1 << BH_Dirty)|(1 << BH_Uptodate)); | |
195 | } | |
196 | gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1); | |
197 | } | |
198 | return block_write_full_page(page, gfs2_get_block_noalloc, wbc); | |
199 | } | |
200 | ||
9ff8ec32 SW |
201 | /** |
202 | * gfs2_jdata_writepage - Write complete page | |
203 | * @page: Page to write | |
204 | * | |
205 | * Returns: errno | |
206 | * | |
207 | */ | |
208 | ||
209 | static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) | |
210 | { | |
211 | struct inode *inode = page->mapping->host; | |
9ff8ec32 SW |
212 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
213 | int error; | |
214 | int done_trans = 0; | |
215 | ||
216 | error = gfs2_writepage_common(page, wbc); | |
217 | if (error <= 0) | |
218 | return error; | |
b3b94faa | 219 | |
bf36a713 | 220 | if (PageChecked(page)) { |
b8e7cbb6 SW |
221 | if (wbc->sync_mode != WB_SYNC_ALL) |
222 | goto out_ignore; | |
18ec7d5c SW |
223 | error = gfs2_trans_begin(sdp, RES_DINODE + 1, 0); |
224 | if (error) | |
225 | goto out_ignore; | |
18ec7d5c SW |
226 | done_trans = 1; |
227 | } | |
b8e7cbb6 | 228 | error = __gfs2_jdata_writepage(page, wbc); |
18ec7d5c SW |
229 | if (done_trans) |
230 | gfs2_trans_end(sdp); | |
b3b94faa | 231 | return error; |
18ec7d5c SW |
232 | |
233 | out_ignore: | |
234 | redirty_page_for_writepage(wbc, page); | |
235 | unlock_page(page); | |
236 | return 0; | |
b3b94faa DT |
237 | } |
238 | ||
a8d638e3 | 239 | /** |
5561093e | 240 | * gfs2_writeback_writepages - Write a bunch of dirty pages back to disk |
a8d638e3 SW |
241 | * @mapping: The mapping to write |
242 | * @wbc: Write-back control | |
243 | * | |
5561093e | 244 | * For the data=writeback case we can already ignore buffer heads |
a8d638e3 SW |
245 | * and write whole extents at once. This is a big reduction in the |
246 | * number of I/O requests we send and the bmap calls we make in this case. | |
247 | */ | |
5561093e SW |
248 | static int gfs2_writeback_writepages(struct address_space *mapping, |
249 | struct writeback_control *wbc) | |
a8d638e3 | 250 | { |
5561093e | 251 | return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc); |
a8d638e3 SW |
252 | } |
253 | ||
b8e7cbb6 SW |
254 | /** |
255 | * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages | |
256 | * @mapping: The mapping | |
257 | * @wbc: The writeback control | |
258 | * @writepage: The writepage function to call for each page | |
259 | * @pvec: The vector of pages | |
260 | * @nr_pages: The number of pages to write | |
261 | * | |
262 | * Returns: non-zero if loop should terminate, zero otherwise | |
263 | */ | |
264 | ||
265 | static int gfs2_write_jdata_pagevec(struct address_space *mapping, | |
266 | struct writeback_control *wbc, | |
267 | struct pagevec *pvec, | |
268 | int nr_pages, pgoff_t end) | |
269 | { | |
270 | struct inode *inode = mapping->host; | |
271 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
272 | loff_t i_size = i_size_read(inode); | |
273 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
274 | unsigned offset = i_size & (PAGE_CACHE_SIZE-1); | |
275 | unsigned nrblocks = nr_pages * (PAGE_CACHE_SIZE/inode->i_sb->s_blocksize); | |
276 | struct backing_dev_info *bdi = mapping->backing_dev_info; | |
277 | int i; | |
278 | int ret; | |
279 | ||
20b95bf2 | 280 | ret = gfs2_trans_begin(sdp, nrblocks, nrblocks); |
b8e7cbb6 SW |
281 | if (ret < 0) |
282 | return ret; | |
283 | ||
284 | for(i = 0; i < nr_pages; i++) { | |
285 | struct page *page = pvec->pages[i]; | |
286 | ||
287 | lock_page(page); | |
288 | ||
289 | if (unlikely(page->mapping != mapping)) { | |
290 | unlock_page(page); | |
291 | continue; | |
292 | } | |
293 | ||
294 | if (!wbc->range_cyclic && page->index > end) { | |
295 | ret = 1; | |
296 | unlock_page(page); | |
297 | continue; | |
298 | } | |
299 | ||
300 | if (wbc->sync_mode != WB_SYNC_NONE) | |
301 | wait_on_page_writeback(page); | |
302 | ||
303 | if (PageWriteback(page) || | |
304 | !clear_page_dirty_for_io(page)) { | |
305 | unlock_page(page); | |
306 | continue; | |
307 | } | |
308 | ||
309 | /* Is the page fully outside i_size? (truncate in progress) */ | |
310 | if (page->index > end_index || (page->index == end_index && !offset)) { | |
311 | page->mapping->a_ops->invalidatepage(page, 0); | |
312 | unlock_page(page); | |
313 | continue; | |
314 | } | |
315 | ||
316 | ret = __gfs2_jdata_writepage(page, wbc); | |
317 | ||
318 | if (ret || (--(wbc->nr_to_write) <= 0)) | |
319 | ret = 1; | |
320 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
321 | wbc->encountered_congestion = 1; | |
322 | ret = 1; | |
323 | } | |
324 | ||
325 | } | |
326 | gfs2_trans_end(sdp); | |
327 | return ret; | |
328 | } | |
329 | ||
330 | /** | |
331 | * gfs2_write_cache_jdata - Like write_cache_pages but different | |
332 | * @mapping: The mapping to write | |
333 | * @wbc: The writeback control | |
334 | * @writepage: The writepage function to call | |
335 | * @data: The data to pass to writepage | |
336 | * | |
337 | * The reason that we use our own function here is that we need to | |
338 | * start transactions before we grab page locks. This allows us | |
339 | * to get the ordering right. | |
340 | */ | |
341 | ||
342 | static int gfs2_write_cache_jdata(struct address_space *mapping, | |
343 | struct writeback_control *wbc) | |
344 | { | |
345 | struct backing_dev_info *bdi = mapping->backing_dev_info; | |
346 | int ret = 0; | |
347 | int done = 0; | |
348 | struct pagevec pvec; | |
349 | int nr_pages; | |
350 | pgoff_t index; | |
351 | pgoff_t end; | |
352 | int scanned = 0; | |
353 | int range_whole = 0; | |
354 | ||
355 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
356 | wbc->encountered_congestion = 1; | |
357 | return 0; | |
358 | } | |
359 | ||
360 | pagevec_init(&pvec, 0); | |
361 | if (wbc->range_cyclic) { | |
362 | index = mapping->writeback_index; /* Start from prev offset */ | |
363 | end = -1; | |
364 | } else { | |
365 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
366 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
367 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
368 | range_whole = 1; | |
369 | scanned = 1; | |
370 | } | |
371 | ||
372 | retry: | |
373 | while (!done && (index <= end) && | |
374 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
375 | PAGECACHE_TAG_DIRTY, | |
376 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { | |
377 | scanned = 1; | |
378 | ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, end); | |
379 | if (ret) | |
380 | done = 1; | |
381 | if (ret > 0) | |
382 | ret = 0; | |
383 | ||
384 | pagevec_release(&pvec); | |
385 | cond_resched(); | |
386 | } | |
387 | ||
388 | if (!scanned && !done) { | |
389 | /* | |
390 | * We hit the last page and there is more work to be done: wrap | |
391 | * back to the start of the file | |
392 | */ | |
393 | scanned = 1; | |
394 | index = 0; | |
395 | goto retry; | |
396 | } | |
397 | ||
398 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) | |
399 | mapping->writeback_index = index; | |
400 | return ret; | |
401 | } | |
402 | ||
403 | ||
404 | /** | |
405 | * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk | |
406 | * @mapping: The mapping to write | |
407 | * @wbc: The writeback control | |
408 | * | |
409 | */ | |
410 | ||
411 | static int gfs2_jdata_writepages(struct address_space *mapping, | |
412 | struct writeback_control *wbc) | |
413 | { | |
414 | struct gfs2_inode *ip = GFS2_I(mapping->host); | |
415 | struct gfs2_sbd *sdp = GFS2_SB(mapping->host); | |
416 | int ret; | |
417 | ||
418 | ret = gfs2_write_cache_jdata(mapping, wbc); | |
419 | if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) { | |
420 | gfs2_log_flush(sdp, ip->i_gl); | |
421 | ret = gfs2_write_cache_jdata(mapping, wbc); | |
422 | } | |
423 | return ret; | |
424 | } | |
425 | ||
b3b94faa DT |
426 | /** |
427 | * stuffed_readpage - Fill in a Linux page with stuffed file data | |
428 | * @ip: the inode | |
429 | * @page: the page | |
430 | * | |
431 | * Returns: errno | |
432 | */ | |
433 | ||
434 | static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) | |
435 | { | |
436 | struct buffer_head *dibh; | |
437 | void *kaddr; | |
438 | int error; | |
439 | ||
bf126aee | 440 | /* |
3c18ddd1 | 441 | * Due to the order of unstuffing files and ->fault(), we can be |
bf126aee SW |
442 | * asked for a zero page in the case of a stuffed file being extended, |
443 | * so we need to supply one here. It doesn't happen often. | |
444 | */ | |
445 | if (unlikely(page->index)) { | |
eebd2aa3 | 446 | zero_user(page, 0, PAGE_CACHE_SIZE); |
bf126aee SW |
447 | return 0; |
448 | } | |
fd88de56 | 449 | |
b3b94faa DT |
450 | error = gfs2_meta_inode_buffer(ip, &dibh); |
451 | if (error) | |
452 | return error; | |
453 | ||
5c4e9e03 | 454 | kaddr = kmap_atomic(page, KM_USER0); |
fd88de56 | 455 | memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), |
b3b94faa | 456 | ip->i_di.di_size); |
fd88de56 | 457 | memset(kaddr + ip->i_di.di_size, 0, PAGE_CACHE_SIZE - ip->i_di.di_size); |
c312c4fd | 458 | kunmap_atomic(kaddr, KM_USER0); |
bf126aee | 459 | flush_dcache_page(page); |
b3b94faa | 460 | brelse(dibh); |
b3b94faa DT |
461 | SetPageUptodate(page); |
462 | ||
463 | return 0; | |
464 | } | |
465 | ||
b3b94faa | 466 | |
b3b94faa | 467 | /** |
51ff87bd SW |
468 | * __gfs2_readpage - readpage |
469 | * @file: The file to read a page for | |
b3b94faa DT |
470 | * @page: The page to read |
471 | * | |
51ff87bd SW |
472 | * This is the core of gfs2's readpage. Its used by the internal file |
473 | * reading code as in that case we already hold the glock. Also its | |
474 | * called by gfs2_readpage() once the required lock has been granted. | |
475 | * | |
b3b94faa DT |
476 | */ |
477 | ||
51ff87bd | 478 | static int __gfs2_readpage(void *file, struct page *page) |
b3b94faa | 479 | { |
feaa7bba SW |
480 | struct gfs2_inode *ip = GFS2_I(page->mapping->host); |
481 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); | |
b3b94faa DT |
482 | int error; |
483 | ||
18ec7d5c | 484 | if (gfs2_is_stuffed(ip)) { |
fd88de56 SW |
485 | error = stuffed_readpage(ip, page); |
486 | unlock_page(page); | |
51ff87bd | 487 | } else { |
e9e1ef2b | 488 | error = mpage_readpage(page, gfs2_block_map); |
51ff87bd | 489 | } |
b3b94faa DT |
490 | |
491 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
51ff87bd | 492 | return -EIO; |
b3b94faa | 493 | |
51ff87bd SW |
494 | return error; |
495 | } | |
496 | ||
497 | /** | |
498 | * gfs2_readpage - read a page of a file | |
499 | * @file: The file to read | |
500 | * @page: The page of the file | |
501 | * | |
01b7c7ae SW |
502 | * This deals with the locking required. We have to unlock and |
503 | * relock the page in order to get the locking in the right | |
504 | * order. | |
51ff87bd SW |
505 | */ |
506 | ||
507 | static int gfs2_readpage(struct file *file, struct page *page) | |
508 | { | |
01b7c7ae SW |
509 | struct address_space *mapping = page->mapping; |
510 | struct gfs2_inode *ip = GFS2_I(mapping->host); | |
6802e340 | 511 | struct gfs2_holder gh; |
51ff87bd SW |
512 | int error; |
513 | ||
01b7c7ae SW |
514 | unlock_page(page); |
515 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh); | |
6802e340 | 516 | error = gfs2_glock_nq_atime(&gh); |
01b7c7ae | 517 | if (unlikely(error)) |
6802e340 | 518 | goto out; |
01b7c7ae SW |
519 | error = AOP_TRUNCATED_PAGE; |
520 | lock_page(page); | |
521 | if (page->mapping == mapping && !PageUptodate(page)) | |
522 | error = __gfs2_readpage(file, page); | |
523 | else | |
524 | unlock_page(page); | |
6802e340 | 525 | gfs2_glock_dq(&gh); |
18ec7d5c | 526 | out: |
6802e340 | 527 | gfs2_holder_uninit(&gh); |
01b7c7ae SW |
528 | if (error && error != AOP_TRUNCATED_PAGE) |
529 | lock_page(page); | |
51ff87bd SW |
530 | return error; |
531 | } | |
532 | ||
533 | /** | |
534 | * gfs2_internal_read - read an internal file | |
535 | * @ip: The gfs2 inode | |
536 | * @ra_state: The readahead state (or NULL for no readahead) | |
537 | * @buf: The buffer to fill | |
538 | * @pos: The file position | |
539 | * @size: The amount to read | |
540 | * | |
541 | */ | |
542 | ||
543 | int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state, | |
544 | char *buf, loff_t *pos, unsigned size) | |
545 | { | |
546 | struct address_space *mapping = ip->i_inode.i_mapping; | |
547 | unsigned long index = *pos / PAGE_CACHE_SIZE; | |
548 | unsigned offset = *pos & (PAGE_CACHE_SIZE - 1); | |
549 | unsigned copied = 0; | |
550 | unsigned amt; | |
551 | struct page *page; | |
552 | void *p; | |
553 | ||
554 | do { | |
555 | amt = size - copied; | |
556 | if (offset + size > PAGE_CACHE_SIZE) | |
557 | amt = PAGE_CACHE_SIZE - offset; | |
558 | page = read_cache_page(mapping, index, __gfs2_readpage, NULL); | |
559 | if (IS_ERR(page)) | |
560 | return PTR_ERR(page); | |
561 | p = kmap_atomic(page, KM_USER0); | |
562 | memcpy(buf + copied, p + offset, amt); | |
563 | kunmap_atomic(p, KM_USER0); | |
564 | mark_page_accessed(page); | |
565 | page_cache_release(page); | |
566 | copied += amt; | |
567 | index++; | |
568 | offset = 0; | |
569 | } while(copied < size); | |
570 | (*pos) += size; | |
571 | return size; | |
fd88de56 SW |
572 | } |
573 | ||
fd88de56 SW |
574 | /** |
575 | * gfs2_readpages - Read a bunch of pages at once | |
576 | * | |
577 | * Some notes: | |
578 | * 1. This is only for readahead, so we can simply ignore any things | |
579 | * which are slightly inconvenient (such as locking conflicts between | |
580 | * the page lock and the glock) and return having done no I/O. Its | |
581 | * obviously not something we'd want to do on too regular a basis. | |
582 | * Any I/O we ignore at this time will be done via readpage later. | |
e1d5b18a | 583 | * 2. We don't handle stuffed files here we let readpage do the honours. |
fd88de56 | 584 | * 3. mpage_readpages() does most of the heavy lifting in the common case. |
e9e1ef2b | 585 | * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places. |
fd88de56 | 586 | */ |
3cc3f710 | 587 | |
fd88de56 SW |
588 | static int gfs2_readpages(struct file *file, struct address_space *mapping, |
589 | struct list_head *pages, unsigned nr_pages) | |
590 | { | |
591 | struct inode *inode = mapping->host; | |
feaa7bba SW |
592 | struct gfs2_inode *ip = GFS2_I(inode); |
593 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
fd88de56 | 594 | struct gfs2_holder gh; |
3cc3f710 | 595 | int ret; |
fd88de56 | 596 | |
3cc3f710 | 597 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh); |
51ff87bd | 598 | ret = gfs2_glock_nq_atime(&gh); |
51ff87bd | 599 | if (unlikely(ret)) |
3cc3f710 | 600 | goto out_uninit; |
e1d5b18a | 601 | if (!gfs2_is_stuffed(ip)) |
e9e1ef2b | 602 | ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map); |
3cc3f710 SW |
603 | gfs2_glock_dq(&gh); |
604 | out_uninit: | |
605 | gfs2_holder_uninit(&gh); | |
fd88de56 SW |
606 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
607 | ret = -EIO; | |
608 | return ret; | |
b3b94faa DT |
609 | } |
610 | ||
611 | /** | |
7765ec26 | 612 | * gfs2_write_begin - Begin to write to a file |
b3b94faa | 613 | * @file: The file to write to |
7765ec26 SW |
614 | * @mapping: The mapping in which to write |
615 | * @pos: The file offset at which to start writing | |
616 | * @len: Length of the write | |
617 | * @flags: Various flags | |
618 | * @pagep: Pointer to return the page | |
619 | * @fsdata: Pointer to return fs data (unused by GFS2) | |
b3b94faa DT |
620 | * |
621 | * Returns: errno | |
622 | */ | |
623 | ||
7765ec26 SW |
624 | static int gfs2_write_begin(struct file *file, struct address_space *mapping, |
625 | loff_t pos, unsigned len, unsigned flags, | |
626 | struct page **pagep, void **fsdata) | |
b3b94faa | 627 | { |
7765ec26 SW |
628 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
629 | struct gfs2_sbd *sdp = GFS2_SB(mapping->host); | |
18ec7d5c SW |
630 | unsigned int data_blocks, ind_blocks, rblocks; |
631 | int alloc_required; | |
b3b94faa | 632 | int error = 0; |
18ec7d5c | 633 | struct gfs2_alloc *al; |
7765ec26 SW |
634 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
635 | unsigned from = pos & (PAGE_CACHE_SIZE - 1); | |
636 | unsigned to = from + len; | |
637 | struct page *page; | |
52ae7b79 | 638 | |
7765ec26 | 639 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME, &ip->i_gh); |
dcd24799 | 640 | error = gfs2_glock_nq_atime(&ip->i_gh); |
7765ec26 | 641 | if (unlikely(error)) |
18ec7d5c | 642 | goto out_uninit; |
b3b94faa | 643 | |
7765ec26 | 644 | gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks); |
7765ec26 | 645 | error = gfs2_write_alloc_required(ip, pos, len, &alloc_required); |
18ec7d5c | 646 | if (error) |
c41d4f09 | 647 | goto out_unlock; |
18ec7d5c SW |
648 | |
649 | if (alloc_required) { | |
650 | al = gfs2_alloc_get(ip); | |
182fe5ab CG |
651 | if (!al) { |
652 | error = -ENOMEM; | |
653 | goto out_unlock; | |
654 | } | |
18ec7d5c | 655 | |
d82661d9 | 656 | error = gfs2_quota_lock_check(ip); |
18ec7d5c SW |
657 | if (error) |
658 | goto out_alloc_put; | |
659 | ||
18ec7d5c SW |
660 | al->al_requested = data_blocks + ind_blocks; |
661 | error = gfs2_inplace_reserve(ip); | |
662 | if (error) | |
663 | goto out_qunlock; | |
664 | } | |
665 | ||
666 | rblocks = RES_DINODE + ind_blocks; | |
667 | if (gfs2_is_jdata(ip)) | |
668 | rblocks += data_blocks ? data_blocks : 1; | |
669 | if (ind_blocks || data_blocks) | |
670 | rblocks += RES_STATFS + RES_QUOTA; | |
671 | ||
16615be1 SW |
672 | error = gfs2_trans_begin(sdp, rblocks, |
673 | PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize); | |
18ec7d5c | 674 | if (error) |
a867bb28 | 675 | goto out_trans_fail; |
18ec7d5c | 676 | |
c41d4f09 SW |
677 | error = -ENOMEM; |
678 | page = __grab_cache_page(mapping, index); | |
679 | *pagep = page; | |
680 | if (unlikely(!page)) | |
681 | goto out_endtrans; | |
682 | ||
18ec7d5c | 683 | if (gfs2_is_stuffed(ip)) { |
c41d4f09 | 684 | error = 0; |
7765ec26 | 685 | if (pos + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { |
f25ef0c1 | 686 | error = gfs2_unstuff_dinode(ip, page); |
5c4e9e03 SW |
687 | if (error == 0) |
688 | goto prepare_write; | |
c41d4f09 | 689 | } else if (!PageUptodate(page)) { |
b3b94faa | 690 | error = stuffed_readpage(ip, page); |
c41d4f09 | 691 | } |
5c4e9e03 | 692 | goto out; |
18ec7d5c SW |
693 | } |
694 | ||
5c4e9e03 | 695 | prepare_write: |
e9e1ef2b | 696 | error = block_prepare_write(page, from, to, gfs2_block_map); |
18ec7d5c | 697 | out: |
c41d4f09 SW |
698 | if (error == 0) |
699 | return 0; | |
700 | ||
701 | page_cache_release(page); | |
702 | if (pos + len > ip->i_inode.i_size) | |
703 | vmtruncate(&ip->i_inode, ip->i_inode.i_size); | |
704 | out_endtrans: | |
705 | gfs2_trans_end(sdp); | |
a867bb28 | 706 | out_trans_fail: |
c41d4f09 SW |
707 | if (alloc_required) { |
708 | gfs2_inplace_release(ip); | |
18ec7d5c | 709 | out_qunlock: |
c41d4f09 | 710 | gfs2_quota_unlock(ip); |
18ec7d5c | 711 | out_alloc_put: |
c41d4f09 SW |
712 | gfs2_alloc_put(ip); |
713 | } | |
18ec7d5c | 714 | out_unlock: |
c41d4f09 | 715 | gfs2_glock_dq(&ip->i_gh); |
18ec7d5c | 716 | out_uninit: |
c41d4f09 | 717 | gfs2_holder_uninit(&ip->i_gh); |
b3b94faa DT |
718 | return error; |
719 | } | |
720 | ||
7ae8fa84 RP |
721 | /** |
722 | * adjust_fs_space - Adjusts the free space available due to gfs2_grow | |
723 | * @inode: the rindex inode | |
724 | */ | |
725 | static void adjust_fs_space(struct inode *inode) | |
726 | { | |
727 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; | |
728 | struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; | |
729 | struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; | |
730 | u64 fs_total, new_free; | |
731 | ||
732 | /* Total up the file system space, according to the latest rindex. */ | |
733 | fs_total = gfs2_ri_total(sdp); | |
734 | ||
735 | spin_lock(&sdp->sd_statfs_spin); | |
736 | if (fs_total > (m_sc->sc_total + l_sc->sc_total)) | |
737 | new_free = fs_total - (m_sc->sc_total + l_sc->sc_total); | |
738 | else | |
739 | new_free = 0; | |
740 | spin_unlock(&sdp->sd_statfs_spin); | |
6c53267f RP |
741 | fs_warn(sdp, "File system extended by %llu blocks.\n", |
742 | (unsigned long long)new_free); | |
7ae8fa84 RP |
743 | gfs2_statfs_change(sdp, new_free, new_free, 0); |
744 | } | |
745 | ||
b3b94faa | 746 | /** |
7765ec26 SW |
747 | * gfs2_stuffed_write_end - Write end for stuffed files |
748 | * @inode: The inode | |
749 | * @dibh: The buffer_head containing the on-disk inode | |
750 | * @pos: The file position | |
751 | * @len: The length of the write | |
752 | * @copied: How much was actually copied by the VFS | |
753 | * @page: The page | |
754 | * | |
755 | * This copies the data from the page into the inode block after | |
756 | * the inode data structure itself. | |
757 | * | |
758 | * Returns: errno | |
759 | */ | |
760 | static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh, | |
761 | loff_t pos, unsigned len, unsigned copied, | |
762 | struct page *page) | |
763 | { | |
764 | struct gfs2_inode *ip = GFS2_I(inode); | |
765 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
766 | u64 to = pos + copied; | |
767 | void *kaddr; | |
768 | unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode); | |
769 | struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; | |
770 | ||
771 | BUG_ON((pos + len) > (dibh->b_size - sizeof(struct gfs2_dinode))); | |
772 | kaddr = kmap_atomic(page, KM_USER0); | |
773 | memcpy(buf + pos, kaddr + pos, copied); | |
774 | memset(kaddr + pos + copied, 0, len - copied); | |
775 | flush_dcache_page(page); | |
776 | kunmap_atomic(kaddr, KM_USER0); | |
777 | ||
778 | if (!PageUptodate(page)) | |
779 | SetPageUptodate(page); | |
780 | unlock_page(page); | |
781 | page_cache_release(page); | |
782 | ||
783 | if (inode->i_size < to) { | |
784 | i_size_write(inode, to); | |
785 | ip->i_di.di_size = inode->i_size; | |
786 | di->di_size = cpu_to_be64(inode->i_size); | |
787 | mark_inode_dirty(inode); | |
788 | } | |
789 | ||
790 | if (inode == sdp->sd_rindex) | |
791 | adjust_fs_space(inode); | |
792 | ||
793 | brelse(dibh); | |
794 | gfs2_trans_end(sdp); | |
795 | gfs2_glock_dq(&ip->i_gh); | |
796 | gfs2_holder_uninit(&ip->i_gh); | |
797 | return copied; | |
798 | } | |
799 | ||
800 | /** | |
801 | * gfs2_write_end | |
b3b94faa | 802 | * @file: The file to write to |
7765ec26 SW |
803 | * @mapping: The address space to write to |
804 | * @pos: The file position | |
805 | * @len: The length of the data | |
806 | * @copied: | |
807 | * @page: The page that has been written | |
808 | * @fsdata: The fsdata (unused in GFS2) | |
809 | * | |
810 | * The main write_end function for GFS2. We have a separate one for | |
811 | * stuffed files as they are slightly different, otherwise we just | |
812 | * put our locking around the VFS provided functions. | |
b3b94faa DT |
813 | * |
814 | * Returns: errno | |
815 | */ | |
816 | ||
7765ec26 SW |
817 | static int gfs2_write_end(struct file *file, struct address_space *mapping, |
818 | loff_t pos, unsigned len, unsigned copied, | |
819 | struct page *page, void *fsdata) | |
b3b94faa DT |
820 | { |
821 | struct inode *inode = page->mapping->host; | |
feaa7bba SW |
822 | struct gfs2_inode *ip = GFS2_I(inode); |
823 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
18ec7d5c | 824 | struct buffer_head *dibh; |
6dbd8224 | 825 | struct gfs2_alloc *al = ip->i_alloc; |
48516ced | 826 | struct gfs2_dinode *di; |
7765ec26 SW |
827 | unsigned int from = pos & (PAGE_CACHE_SIZE - 1); |
828 | unsigned int to = from + len; | |
829 | int ret; | |
b3b94faa | 830 | |
7afd88d9 | 831 | BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL); |
18ec7d5c | 832 | |
7765ec26 SW |
833 | ret = gfs2_meta_inode_buffer(ip, &dibh); |
834 | if (unlikely(ret)) { | |
835 | unlock_page(page); | |
836 | page_cache_release(page); | |
837 | goto failed; | |
838 | } | |
18ec7d5c SW |
839 | |
840 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); | |
b3b94faa | 841 | |
7765ec26 SW |
842 | if (gfs2_is_stuffed(ip)) |
843 | return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page); | |
b3b94faa | 844 | |
bf36a713 | 845 | if (!gfs2_is_writeback(ip)) |
7765ec26 | 846 | gfs2_page_add_databufs(ip, page, from, to); |
b3b94faa | 847 | |
7765ec26 | 848 | ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); |
b3b94faa | 849 | |
9656b2c1 SW |
850 | if (likely(ret >= 0) && (inode->i_size > ip->i_di.di_size)) { |
851 | di = (struct gfs2_dinode *)dibh->b_data; | |
852 | ip->i_di.di_size = inode->i_size; | |
853 | di->di_size = cpu_to_be64(inode->i_size); | |
854 | mark_inode_dirty(inode); | |
48516ced SW |
855 | } |
856 | ||
7ae8fa84 RP |
857 | if (inode == sdp->sd_rindex) |
858 | adjust_fs_space(inode); | |
859 | ||
18ec7d5c SW |
860 | brelse(dibh); |
861 | gfs2_trans_end(sdp); | |
7765ec26 | 862 | failed: |
6dbd8224 | 863 | if (al) { |
18ec7d5c SW |
864 | gfs2_inplace_release(ip); |
865 | gfs2_quota_unlock(ip); | |
866 | gfs2_alloc_put(ip); | |
867 | } | |
7765ec26 | 868 | gfs2_glock_dq(&ip->i_gh); |
18ec7d5c | 869 | gfs2_holder_uninit(&ip->i_gh); |
7765ec26 | 870 | return ret; |
b3b94faa DT |
871 | } |
872 | ||
8fb68595 RP |
873 | /** |
874 | * gfs2_set_page_dirty - Page dirtying function | |
875 | * @page: The page to dirty | |
876 | * | |
877 | * Returns: 1 if it dirtyed the page, or 0 otherwise | |
878 | */ | |
879 | ||
880 | static int gfs2_set_page_dirty(struct page *page) | |
881 | { | |
5561093e | 882 | SetPageChecked(page); |
8fb68595 RP |
883 | return __set_page_dirty_buffers(page); |
884 | } | |
885 | ||
b3b94faa DT |
886 | /** |
887 | * gfs2_bmap - Block map function | |
888 | * @mapping: Address space info | |
889 | * @lblock: The block to map | |
890 | * | |
891 | * Returns: The disk address for the block or 0 on hole or error | |
892 | */ | |
893 | ||
894 | static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) | |
895 | { | |
feaa7bba | 896 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
b3b94faa DT |
897 | struct gfs2_holder i_gh; |
898 | sector_t dblock = 0; | |
899 | int error; | |
900 | ||
b3b94faa DT |
901 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
902 | if (error) | |
903 | return 0; | |
904 | ||
905 | if (!gfs2_is_stuffed(ip)) | |
e9e1ef2b | 906 | dblock = generic_block_bmap(mapping, lblock, gfs2_block_map); |
b3b94faa DT |
907 | |
908 | gfs2_glock_dq_uninit(&i_gh); | |
909 | ||
910 | return dblock; | |
911 | } | |
912 | ||
d7b616e2 SW |
913 | static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh) |
914 | { | |
915 | struct gfs2_bufdata *bd; | |
916 | ||
917 | lock_buffer(bh); | |
918 | gfs2_log_lock(sdp); | |
919 | clear_buffer_dirty(bh); | |
920 | bd = bh->b_private; | |
921 | if (bd) { | |
16615be1 SW |
922 | if (!list_empty(&bd->bd_le.le_list) && !buffer_pinned(bh)) |
923 | list_del_init(&bd->bd_le.le_list); | |
924 | else | |
925 | gfs2_remove_from_journal(bh, current->journal_info, 0); | |
d7b616e2 SW |
926 | } |
927 | bh->b_bdev = NULL; | |
928 | clear_buffer_mapped(bh); | |
929 | clear_buffer_req(bh); | |
930 | clear_buffer_new(bh); | |
931 | gfs2_log_unlock(sdp); | |
932 | unlock_buffer(bh); | |
933 | } | |
934 | ||
8628de05 | 935 | static void gfs2_invalidatepage(struct page *page, unsigned long offset) |
b3b94faa | 936 | { |
d7b616e2 SW |
937 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); |
938 | struct buffer_head *bh, *head; | |
939 | unsigned long pos = 0; | |
940 | ||
b3b94faa | 941 | BUG_ON(!PageLocked(page)); |
8fb68595 RP |
942 | if (offset == 0) |
943 | ClearPageChecked(page); | |
d7b616e2 SW |
944 | if (!page_has_buffers(page)) |
945 | goto out; | |
b3b94faa | 946 | |
d7b616e2 SW |
947 | bh = head = page_buffers(page); |
948 | do { | |
949 | if (offset <= pos) | |
950 | gfs2_discard(sdp, bh); | |
951 | pos += bh->b_size; | |
952 | bh = bh->b_this_page; | |
953 | } while (bh != head); | |
954 | out: | |
955 | if (offset == 0) | |
956 | try_to_release_page(page, 0); | |
b3b94faa DT |
957 | } |
958 | ||
c7b33834 SW |
959 | /** |
960 | * gfs2_ok_for_dio - check that dio is valid on this file | |
961 | * @ip: The inode | |
962 | * @rw: READ or WRITE | |
963 | * @offset: The offset at which we are reading or writing | |
964 | * | |
965 | * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o) | |
966 | * 1 (to accept the i/o request) | |
967 | */ | |
968 | static int gfs2_ok_for_dio(struct gfs2_inode *ip, int rw, loff_t offset) | |
969 | { | |
970 | /* | |
971 | * Should we return an error here? I can't see that O_DIRECT for | |
5561093e SW |
972 | * a stuffed file makes any sense. For now we'll silently fall |
973 | * back to buffered I/O | |
c7b33834 | 974 | */ |
c7b33834 SW |
975 | if (gfs2_is_stuffed(ip)) |
976 | return 0; | |
977 | ||
978 | if (offset > i_size_read(&ip->i_inode)) | |
979 | return 0; | |
980 | return 1; | |
981 | } | |
982 | ||
983 | ||
984 | ||
a9e5f4d0 SW |
985 | static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb, |
986 | const struct iovec *iov, loff_t offset, | |
987 | unsigned long nr_segs) | |
d1665e41 SW |
988 | { |
989 | struct file *file = iocb->ki_filp; | |
990 | struct inode *inode = file->f_mapping->host; | |
feaa7bba | 991 | struct gfs2_inode *ip = GFS2_I(inode); |
d1665e41 SW |
992 | struct gfs2_holder gh; |
993 | int rv; | |
994 | ||
995 | /* | |
c7b33834 SW |
996 | * Deferred lock, even if its a write, since we do no allocation |
997 | * on this path. All we need change is atime, and this lock mode | |
998 | * ensures that other nodes have flushed their buffered read caches | |
999 | * (i.e. their page cache entries for this inode). We do not, | |
1000 | * unfortunately have the option of only flushing a range like | |
1001 | * the VFS does. | |
d1665e41 | 1002 | */ |
c7b33834 | 1003 | gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, GL_ATIME, &gh); |
dcd24799 | 1004 | rv = gfs2_glock_nq_atime(&gh); |
d1665e41 | 1005 | if (rv) |
c7b33834 SW |
1006 | return rv; |
1007 | rv = gfs2_ok_for_dio(ip, rw, offset); | |
1008 | if (rv != 1) | |
1009 | goto out; /* dio not valid, fall back to buffered i/o */ | |
1010 | ||
1011 | rv = blockdev_direct_IO_no_locking(rw, iocb, inode, inode->i_sb->s_bdev, | |
1012 | iov, offset, nr_segs, | |
1013 | gfs2_get_block_direct, NULL); | |
d1665e41 SW |
1014 | out: |
1015 | gfs2_glock_dq_m(1, &gh); | |
1016 | gfs2_holder_uninit(&gh); | |
d1665e41 SW |
1017 | return rv; |
1018 | } | |
1019 | ||
4340fe62 | 1020 | /** |
623d9355 | 1021 | * gfs2_releasepage - free the metadata associated with a page |
4340fe62 SW |
1022 | * @page: the page that's being released |
1023 | * @gfp_mask: passed from Linux VFS, ignored by us | |
1024 | * | |
1025 | * Call try_to_free_buffers() if the buffers in this page can be | |
1026 | * released. | |
1027 | * | |
1028 | * Returns: 0 | |
1029 | */ | |
1030 | ||
1031 | int gfs2_releasepage(struct page *page, gfp_t gfp_mask) | |
1032 | { | |
1033 | struct inode *aspace = page->mapping->host; | |
1034 | struct gfs2_sbd *sdp = aspace->i_sb->s_fs_info; | |
1035 | struct buffer_head *bh, *head; | |
1036 | struct gfs2_bufdata *bd; | |
4340fe62 SW |
1037 | |
1038 | if (!page_has_buffers(page)) | |
891ba6d4 | 1039 | return 0; |
4340fe62 | 1040 | |
bb3b0e3d | 1041 | gfs2_log_lock(sdp); |
4340fe62 SW |
1042 | head = bh = page_buffers(page); |
1043 | do { | |
bb3b0e3d SW |
1044 | if (atomic_read(&bh->b_count)) |
1045 | goto cannot_release; | |
1046 | bd = bh->b_private; | |
1047 | if (bd && bd->bd_ail) | |
1048 | goto cannot_release; | |
4340fe62 | 1049 | gfs2_assert_warn(sdp, !buffer_pinned(bh)); |
623d9355 | 1050 | gfs2_assert_warn(sdp, !buffer_dirty(bh)); |
bb3b0e3d SW |
1051 | bh = bh->b_this_page; |
1052 | } while(bh != head); | |
1053 | gfs2_log_unlock(sdp); | |
4340fe62 | 1054 | |
bb3b0e3d SW |
1055 | head = bh = page_buffers(page); |
1056 | do { | |
623d9355 | 1057 | gfs2_log_lock(sdp); |
4340fe62 SW |
1058 | bd = bh->b_private; |
1059 | if (bd) { | |
1060 | gfs2_assert_warn(sdp, bd->bd_bh == bh); | |
1061 | gfs2_assert_warn(sdp, list_empty(&bd->bd_list_tr)); | |
d7b616e2 SW |
1062 | if (!list_empty(&bd->bd_le.le_list)) { |
1063 | if (!buffer_pinned(bh)) | |
1064 | list_del_init(&bd->bd_le.le_list); | |
1065 | else | |
1066 | bd = NULL; | |
1067 | } | |
1068 | if (bd) | |
1069 | bd->bd_bh = NULL; | |
4340fe62 SW |
1070 | bh->b_private = NULL; |
1071 | } | |
623d9355 SW |
1072 | gfs2_log_unlock(sdp); |
1073 | if (bd) | |
1074 | kmem_cache_free(gfs2_bufdata_cachep, bd); | |
4340fe62 SW |
1075 | |
1076 | bh = bh->b_this_page; | |
166afccd | 1077 | } while (bh != head); |
4340fe62 | 1078 | |
4340fe62 | 1079 | return try_to_free_buffers(page); |
bb3b0e3d SW |
1080 | cannot_release: |
1081 | gfs2_log_unlock(sdp); | |
1082 | return 0; | |
4340fe62 SW |
1083 | } |
1084 | ||
5561093e | 1085 | static const struct address_space_operations gfs2_writeback_aops = { |
9ff8ec32 | 1086 | .writepage = gfs2_writeback_writepage, |
5561093e SW |
1087 | .writepages = gfs2_writeback_writepages, |
1088 | .readpage = gfs2_readpage, | |
1089 | .readpages = gfs2_readpages, | |
1090 | .sync_page = block_sync_page, | |
1091 | .write_begin = gfs2_write_begin, | |
1092 | .write_end = gfs2_write_end, | |
1093 | .bmap = gfs2_bmap, | |
1094 | .invalidatepage = gfs2_invalidatepage, | |
1095 | .releasepage = gfs2_releasepage, | |
1096 | .direct_IO = gfs2_direct_IO, | |
e5d9dc27 | 1097 | .migratepage = buffer_migrate_page, |
5561093e SW |
1098 | }; |
1099 | ||
1100 | static const struct address_space_operations gfs2_ordered_aops = { | |
9ff8ec32 | 1101 | .writepage = gfs2_ordered_writepage, |
b3b94faa | 1102 | .readpage = gfs2_readpage, |
fd88de56 | 1103 | .readpages = gfs2_readpages, |
b3b94faa | 1104 | .sync_page = block_sync_page, |
7765ec26 SW |
1105 | .write_begin = gfs2_write_begin, |
1106 | .write_end = gfs2_write_end, | |
8fb68595 | 1107 | .set_page_dirty = gfs2_set_page_dirty, |
b3b94faa DT |
1108 | .bmap = gfs2_bmap, |
1109 | .invalidatepage = gfs2_invalidatepage, | |
4340fe62 | 1110 | .releasepage = gfs2_releasepage, |
b3b94faa | 1111 | .direct_IO = gfs2_direct_IO, |
e5d9dc27 | 1112 | .migratepage = buffer_migrate_page, |
b3b94faa DT |
1113 | }; |
1114 | ||
5561093e | 1115 | static const struct address_space_operations gfs2_jdata_aops = { |
9ff8ec32 | 1116 | .writepage = gfs2_jdata_writepage, |
b8e7cbb6 | 1117 | .writepages = gfs2_jdata_writepages, |
5561093e SW |
1118 | .readpage = gfs2_readpage, |
1119 | .readpages = gfs2_readpages, | |
1120 | .sync_page = block_sync_page, | |
1121 | .write_begin = gfs2_write_begin, | |
1122 | .write_end = gfs2_write_end, | |
1123 | .set_page_dirty = gfs2_set_page_dirty, | |
1124 | .bmap = gfs2_bmap, | |
1125 | .invalidatepage = gfs2_invalidatepage, | |
1126 | .releasepage = gfs2_releasepage, | |
1127 | }; | |
1128 | ||
1129 | void gfs2_set_aops(struct inode *inode) | |
1130 | { | |
1131 | struct gfs2_inode *ip = GFS2_I(inode); | |
1132 | ||
1133 | if (gfs2_is_writeback(ip)) | |
1134 | inode->i_mapping->a_ops = &gfs2_writeback_aops; | |
1135 | else if (gfs2_is_ordered(ip)) | |
1136 | inode->i_mapping->a_ops = &gfs2_ordered_aops; | |
1137 | else if (gfs2_is_jdata(ip)) | |
1138 | inode->i_mapping->a_ops = &gfs2_jdata_aops; | |
1139 | else | |
1140 | BUG(); | |
1141 | } | |
1142 |