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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> |
47e83b50 | 22 | #include <linux/backing-dev.h> |
e2e40f2c | 23 | #include <linux/uio.h> |
774016b2 | 24 | #include <trace/events/writeback.h> |
b3b94faa DT |
25 | |
26 | #include "gfs2.h" | |
5c676f6d | 27 | #include "incore.h" |
b3b94faa DT |
28 | #include "bmap.h" |
29 | #include "glock.h" | |
30 | #include "inode.h" | |
b3b94faa DT |
31 | #include "log.h" |
32 | #include "meta_io.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 | 40 | |
b120193e BP |
41 | static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page, |
42 | unsigned int from, unsigned int to) | |
ba7f7290 SW |
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); | |
350a9b0a | 56 | gfs2_trans_add_data(ip->i_gl, bh); |
ba7f7290 SW |
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 | 103 | loff_t i_size = i_size_read(inode); |
09cbfeaf | 104 | pgoff_t end_index = i_size >> PAGE_SHIFT; |
18ec7d5c | 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) */ |
09cbfeaf | 112 | offset = i_size & (PAGE_SIZE-1); |
d2d7b8a2 | 113 | if (page->index > end_index || (page->index == end_index && !offset)) { |
09cbfeaf | 114 | page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); |
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 | /** | |
9d358143 | 126 | * gfs2_writepage - Write page for writeback mappings |
9ff8ec32 SW |
127 | * @page: The page |
128 | * @wbc: The writeback control | |
129 | * | |
130 | */ | |
131 | ||
9d358143 | 132 | static int gfs2_writepage(struct page *page, struct writeback_control *wbc) |
9ff8ec32 SW |
133 | { |
134 | int ret; | |
135 | ||
136 | ret = gfs2_writepage_common(page, wbc); | |
137 | if (ret <= 0) | |
138 | return ret; | |
139 | ||
30116ff6 | 140 | return nobh_writepage(page, gfs2_get_block_noalloc, wbc); |
9ff8ec32 SW |
141 | } |
142 | ||
fd4c5748 BM |
143 | /* This is the same as calling block_write_full_page, but it also |
144 | * writes pages outside of i_size | |
145 | */ | |
146 | int gfs2_write_full_page(struct page *page, get_block_t *get_block, | |
147 | struct writeback_control *wbc) | |
148 | { | |
149 | struct inode * const inode = page->mapping->host; | |
150 | loff_t i_size = i_size_read(inode); | |
151 | const pgoff_t end_index = i_size >> PAGE_SHIFT; | |
152 | unsigned offset; | |
153 | ||
154 | /* | |
155 | * The page straddles i_size. It must be zeroed out on each and every | |
156 | * writepage invocation because it may be mmapped. "A file is mapped | |
157 | * in multiples of the page size. For a file that is not a multiple of | |
158 | * the page size, the remaining memory is zeroed when mapped, and | |
159 | * writes to that region are not written out to the file." | |
160 | */ | |
161 | offset = i_size & (PAGE_SIZE-1); | |
162 | if (page->index == end_index && offset) | |
163 | zero_user_segment(page, offset, PAGE_SIZE); | |
164 | ||
165 | return __block_write_full_page(inode, page, get_block, wbc, | |
166 | end_buffer_async_write); | |
167 | } | |
168 | ||
b8e7cbb6 SW |
169 | /** |
170 | * __gfs2_jdata_writepage - The core of jdata writepage | |
171 | * @page: The page to write | |
172 | * @wbc: The writeback control | |
173 | * | |
174 | * This is shared between writepage and writepages and implements the | |
175 | * core of the writepage operation. If a transaction is required then | |
176 | * PageChecked will have been set and the transaction will have | |
177 | * already been started before this is called. | |
178 | */ | |
179 | ||
180 | static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) | |
181 | { | |
182 | struct inode *inode = page->mapping->host; | |
183 | struct gfs2_inode *ip = GFS2_I(inode); | |
184 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
185 | ||
186 | if (PageChecked(page)) { | |
187 | ClearPageChecked(page); | |
188 | if (!page_has_buffers(page)) { | |
189 | create_empty_buffers(page, inode->i_sb->s_blocksize, | |
47a9a527 | 190 | BIT(BH_Dirty)|BIT(BH_Uptodate)); |
b8e7cbb6 SW |
191 | } |
192 | gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1); | |
193 | } | |
fd4c5748 | 194 | return gfs2_write_full_page(page, gfs2_get_block_noalloc, wbc); |
b8e7cbb6 SW |
195 | } |
196 | ||
9ff8ec32 SW |
197 | /** |
198 | * gfs2_jdata_writepage - Write complete page | |
199 | * @page: Page to write | |
1272574b | 200 | * @wbc: The writeback control |
9ff8ec32 SW |
201 | * |
202 | * Returns: errno | |
203 | * | |
204 | */ | |
205 | ||
206 | static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) | |
207 | { | |
208 | struct inode *inode = page->mapping->host; | |
fd4c5748 | 209 | struct gfs2_inode *ip = GFS2_I(inode); |
9ff8ec32 | 210 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
1bb7322f | 211 | int ret; |
9ff8ec32 | 212 | |
fd4c5748 BM |
213 | if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) |
214 | goto out; | |
215 | if (PageChecked(page) || current->journal_info) | |
216 | goto out_ignore; | |
217 | ret = __gfs2_jdata_writepage(page, wbc); | |
1bb7322f | 218 | return ret; |
18ec7d5c SW |
219 | |
220 | out_ignore: | |
221 | redirty_page_for_writepage(wbc, page); | |
fd4c5748 | 222 | out: |
18ec7d5c SW |
223 | unlock_page(page); |
224 | return 0; | |
b3b94faa DT |
225 | } |
226 | ||
a8d638e3 | 227 | /** |
45138990 | 228 | * gfs2_writepages - Write a bunch of dirty pages back to disk |
a8d638e3 SW |
229 | * @mapping: The mapping to write |
230 | * @wbc: Write-back control | |
231 | * | |
45138990 | 232 | * Used for both ordered and writeback modes. |
a8d638e3 | 233 | */ |
45138990 SW |
234 | static int gfs2_writepages(struct address_space *mapping, |
235 | struct writeback_control *wbc) | |
a8d638e3 | 236 | { |
5561093e | 237 | return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc); |
a8d638e3 SW |
238 | } |
239 | ||
b8e7cbb6 SW |
240 | /** |
241 | * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages | |
242 | * @mapping: The mapping | |
243 | * @wbc: The writeback control | |
b8e7cbb6 SW |
244 | * @pvec: The vector of pages |
245 | * @nr_pages: The number of pages to write | |
1272574b FF |
246 | * @end: End position |
247 | * @done_index: Page index | |
b8e7cbb6 SW |
248 | * |
249 | * Returns: non-zero if loop should terminate, zero otherwise | |
250 | */ | |
251 | ||
252 | static int gfs2_write_jdata_pagevec(struct address_space *mapping, | |
253 | struct writeback_control *wbc, | |
254 | struct pagevec *pvec, | |
774016b2 SW |
255 | int nr_pages, pgoff_t end, |
256 | pgoff_t *done_index) | |
b8e7cbb6 SW |
257 | { |
258 | struct inode *inode = mapping->host; | |
259 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
09cbfeaf | 260 | unsigned nrblocks = nr_pages * (PAGE_SIZE/inode->i_sb->s_blocksize); |
b8e7cbb6 SW |
261 | int i; |
262 | int ret; | |
263 | ||
20b95bf2 | 264 | ret = gfs2_trans_begin(sdp, nrblocks, nrblocks); |
b8e7cbb6 SW |
265 | if (ret < 0) |
266 | return ret; | |
267 | ||
268 | for(i = 0; i < nr_pages; i++) { | |
269 | struct page *page = pvec->pages[i]; | |
270 | ||
774016b2 SW |
271 | /* |
272 | * At this point, the page may be truncated or | |
273 | * invalidated (changing page->mapping to NULL), or | |
274 | * even swizzled back from swapper_space to tmpfs file | |
275 | * mapping. However, page->index will not change | |
276 | * because we have a reference on the page. | |
277 | */ | |
278 | if (page->index > end) { | |
279 | /* | |
280 | * can't be range_cyclic (1st pass) because | |
281 | * end == -1 in that case. | |
282 | */ | |
283 | ret = 1; | |
284 | break; | |
285 | } | |
286 | ||
287 | *done_index = page->index; | |
288 | ||
b8e7cbb6 SW |
289 | lock_page(page); |
290 | ||
291 | if (unlikely(page->mapping != mapping)) { | |
774016b2 | 292 | continue_unlock: |
b8e7cbb6 SW |
293 | unlock_page(page); |
294 | continue; | |
295 | } | |
296 | ||
774016b2 SW |
297 | if (!PageDirty(page)) { |
298 | /* someone wrote it for us */ | |
299 | goto continue_unlock; | |
b8e7cbb6 SW |
300 | } |
301 | ||
774016b2 SW |
302 | if (PageWriteback(page)) { |
303 | if (wbc->sync_mode != WB_SYNC_NONE) | |
304 | wait_on_page_writeback(page); | |
305 | else | |
306 | goto continue_unlock; | |
b8e7cbb6 SW |
307 | } |
308 | ||
774016b2 SW |
309 | BUG_ON(PageWriteback(page)); |
310 | if (!clear_page_dirty_for_io(page)) | |
311 | goto continue_unlock; | |
312 | ||
de1414a6 | 313 | trace_wbc_writepage(wbc, inode_to_bdi(inode)); |
b8e7cbb6 SW |
314 | |
315 | ret = __gfs2_jdata_writepage(page, wbc); | |
774016b2 SW |
316 | if (unlikely(ret)) { |
317 | if (ret == AOP_WRITEPAGE_ACTIVATE) { | |
318 | unlock_page(page); | |
319 | ret = 0; | |
320 | } else { | |
321 | ||
322 | /* | |
323 | * done_index is set past this page, | |
324 | * so media errors will not choke | |
325 | * background writeout for the entire | |
326 | * file. This has consequences for | |
327 | * range_cyclic semantics (ie. it may | |
328 | * not be suitable for data integrity | |
329 | * writeout). | |
330 | */ | |
331 | *done_index = page->index + 1; | |
332 | ret = 1; | |
333 | break; | |
334 | } | |
335 | } | |
b8e7cbb6 | 336 | |
774016b2 SW |
337 | /* |
338 | * We stop writing back only if we are not doing | |
339 | * integrity sync. In case of integrity sync we have to | |
340 | * keep going until we have written all the pages | |
341 | * we tagged for writeback prior to entering this loop. | |
342 | */ | |
343 | if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) { | |
b8e7cbb6 | 344 | ret = 1; |
774016b2 SW |
345 | break; |
346 | } | |
347 | ||
b8e7cbb6 SW |
348 | } |
349 | gfs2_trans_end(sdp); | |
350 | return ret; | |
351 | } | |
352 | ||
353 | /** | |
354 | * gfs2_write_cache_jdata - Like write_cache_pages but different | |
355 | * @mapping: The mapping to write | |
356 | * @wbc: The writeback control | |
b8e7cbb6 SW |
357 | * |
358 | * The reason that we use our own function here is that we need to | |
359 | * start transactions before we grab page locks. This allows us | |
360 | * to get the ordering right. | |
361 | */ | |
362 | ||
363 | static int gfs2_write_cache_jdata(struct address_space *mapping, | |
364 | struct writeback_control *wbc) | |
365 | { | |
b8e7cbb6 SW |
366 | int ret = 0; |
367 | int done = 0; | |
368 | struct pagevec pvec; | |
369 | int nr_pages; | |
774016b2 | 370 | pgoff_t uninitialized_var(writeback_index); |
b8e7cbb6 SW |
371 | pgoff_t index; |
372 | pgoff_t end; | |
774016b2 SW |
373 | pgoff_t done_index; |
374 | int cycled; | |
b8e7cbb6 | 375 | int range_whole = 0; |
774016b2 | 376 | int tag; |
b8e7cbb6 | 377 | |
b8e7cbb6 SW |
378 | pagevec_init(&pvec, 0); |
379 | if (wbc->range_cyclic) { | |
774016b2 SW |
380 | writeback_index = mapping->writeback_index; /* prev offset */ |
381 | index = writeback_index; | |
382 | if (index == 0) | |
383 | cycled = 1; | |
384 | else | |
385 | cycled = 0; | |
b8e7cbb6 SW |
386 | end = -1; |
387 | } else { | |
09cbfeaf KS |
388 | index = wbc->range_start >> PAGE_SHIFT; |
389 | end = wbc->range_end >> PAGE_SHIFT; | |
b8e7cbb6 SW |
390 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
391 | range_whole = 1; | |
774016b2 | 392 | cycled = 1; /* ignore range_cyclic tests */ |
b8e7cbb6 | 393 | } |
774016b2 SW |
394 | if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) |
395 | tag = PAGECACHE_TAG_TOWRITE; | |
396 | else | |
397 | tag = PAGECACHE_TAG_DIRTY; | |
b8e7cbb6 SW |
398 | |
399 | retry: | |
774016b2 SW |
400 | if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) |
401 | tag_pages_for_writeback(mapping, index, end); | |
402 | done_index = index; | |
403 | while (!done && (index <= end)) { | |
404 | nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, | |
405 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1); | |
406 | if (nr_pages == 0) | |
407 | break; | |
408 | ||
409 | ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, end, &done_index); | |
b8e7cbb6 SW |
410 | if (ret) |
411 | done = 1; | |
412 | if (ret > 0) | |
413 | ret = 0; | |
b8e7cbb6 SW |
414 | pagevec_release(&pvec); |
415 | cond_resched(); | |
416 | } | |
417 | ||
774016b2 | 418 | if (!cycled && !done) { |
b8e7cbb6 | 419 | /* |
774016b2 | 420 | * range_cyclic: |
b8e7cbb6 SW |
421 | * We hit the last page and there is more work to be done: wrap |
422 | * back to the start of the file | |
423 | */ | |
774016b2 | 424 | cycled = 1; |
b8e7cbb6 | 425 | index = 0; |
774016b2 | 426 | end = writeback_index - 1; |
b8e7cbb6 SW |
427 | goto retry; |
428 | } | |
429 | ||
430 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) | |
774016b2 SW |
431 | mapping->writeback_index = done_index; |
432 | ||
b8e7cbb6 SW |
433 | return ret; |
434 | } | |
435 | ||
436 | ||
437 | /** | |
438 | * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk | |
439 | * @mapping: The mapping to write | |
440 | * @wbc: The writeback control | |
441 | * | |
442 | */ | |
443 | ||
444 | static int gfs2_jdata_writepages(struct address_space *mapping, | |
445 | struct writeback_control *wbc) | |
446 | { | |
447 | struct gfs2_inode *ip = GFS2_I(mapping->host); | |
448 | struct gfs2_sbd *sdp = GFS2_SB(mapping->host); | |
449 | int ret; | |
450 | ||
451 | ret = gfs2_write_cache_jdata(mapping, wbc); | |
452 | if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) { | |
24972557 | 453 | gfs2_log_flush(sdp, ip->i_gl, NORMAL_FLUSH); |
b8e7cbb6 SW |
454 | ret = gfs2_write_cache_jdata(mapping, wbc); |
455 | } | |
456 | return ret; | |
457 | } | |
458 | ||
b3b94faa DT |
459 | /** |
460 | * stuffed_readpage - Fill in a Linux page with stuffed file data | |
461 | * @ip: the inode | |
462 | * @page: the page | |
463 | * | |
464 | * Returns: errno | |
465 | */ | |
466 | ||
467 | static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) | |
468 | { | |
469 | struct buffer_head *dibh; | |
602c89d2 | 470 | u64 dsize = i_size_read(&ip->i_inode); |
b3b94faa DT |
471 | void *kaddr; |
472 | int error; | |
473 | ||
bf126aee | 474 | /* |
3c18ddd1 | 475 | * Due to the order of unstuffing files and ->fault(), we can be |
bf126aee SW |
476 | * asked for a zero page in the case of a stuffed file being extended, |
477 | * so we need to supply one here. It doesn't happen often. | |
478 | */ | |
479 | if (unlikely(page->index)) { | |
09cbfeaf | 480 | zero_user(page, 0, PAGE_SIZE); |
0a7ab79c | 481 | SetPageUptodate(page); |
bf126aee SW |
482 | return 0; |
483 | } | |
fd88de56 | 484 | |
b3b94faa DT |
485 | error = gfs2_meta_inode_buffer(ip, &dibh); |
486 | if (error) | |
487 | return error; | |
488 | ||
d9349285 | 489 | kaddr = kmap_atomic(page); |
602c89d2 SW |
490 | if (dsize > (dibh->b_size - sizeof(struct gfs2_dinode))) |
491 | dsize = (dibh->b_size - sizeof(struct gfs2_dinode)); | |
492 | memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize); | |
09cbfeaf | 493 | memset(kaddr + dsize, 0, PAGE_SIZE - dsize); |
d9349285 | 494 | kunmap_atomic(kaddr); |
bf126aee | 495 | flush_dcache_page(page); |
b3b94faa | 496 | brelse(dibh); |
b3b94faa DT |
497 | SetPageUptodate(page); |
498 | ||
499 | return 0; | |
500 | } | |
501 | ||
b3b94faa | 502 | |
b3b94faa | 503 | /** |
51ff87bd SW |
504 | * __gfs2_readpage - readpage |
505 | * @file: The file to read a page for | |
b3b94faa DT |
506 | * @page: The page to read |
507 | * | |
51ff87bd SW |
508 | * This is the core of gfs2's readpage. Its used by the internal file |
509 | * reading code as in that case we already hold the glock. Also its | |
510 | * called by gfs2_readpage() once the required lock has been granted. | |
511 | * | |
b3b94faa DT |
512 | */ |
513 | ||
51ff87bd | 514 | static int __gfs2_readpage(void *file, struct page *page) |
b3b94faa | 515 | { |
feaa7bba SW |
516 | struct gfs2_inode *ip = GFS2_I(page->mapping->host); |
517 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); | |
b3b94faa DT |
518 | int error; |
519 | ||
18ec7d5c | 520 | if (gfs2_is_stuffed(ip)) { |
fd88de56 SW |
521 | error = stuffed_readpage(ip, page); |
522 | unlock_page(page); | |
51ff87bd | 523 | } else { |
e9e1ef2b | 524 | error = mpage_readpage(page, gfs2_block_map); |
51ff87bd | 525 | } |
b3b94faa DT |
526 | |
527 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
51ff87bd | 528 | return -EIO; |
b3b94faa | 529 | |
51ff87bd SW |
530 | return error; |
531 | } | |
532 | ||
533 | /** | |
534 | * gfs2_readpage - read a page of a file | |
535 | * @file: The file to read | |
536 | * @page: The page of the file | |
537 | * | |
01b7c7ae SW |
538 | * This deals with the locking required. We have to unlock and |
539 | * relock the page in order to get the locking in the right | |
540 | * order. | |
51ff87bd SW |
541 | */ |
542 | ||
543 | static int gfs2_readpage(struct file *file, struct page *page) | |
544 | { | |
01b7c7ae SW |
545 | struct address_space *mapping = page->mapping; |
546 | struct gfs2_inode *ip = GFS2_I(mapping->host); | |
6802e340 | 547 | struct gfs2_holder gh; |
51ff87bd SW |
548 | int error; |
549 | ||
01b7c7ae | 550 | unlock_page(page); |
719ee344 SW |
551 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
552 | error = gfs2_glock_nq(&gh); | |
01b7c7ae | 553 | if (unlikely(error)) |
6802e340 | 554 | goto out; |
01b7c7ae SW |
555 | error = AOP_TRUNCATED_PAGE; |
556 | lock_page(page); | |
557 | if (page->mapping == mapping && !PageUptodate(page)) | |
558 | error = __gfs2_readpage(file, page); | |
559 | else | |
560 | unlock_page(page); | |
6802e340 | 561 | gfs2_glock_dq(&gh); |
18ec7d5c | 562 | out: |
6802e340 | 563 | gfs2_holder_uninit(&gh); |
01b7c7ae SW |
564 | if (error && error != AOP_TRUNCATED_PAGE) |
565 | lock_page(page); | |
51ff87bd SW |
566 | return error; |
567 | } | |
568 | ||
569 | /** | |
570 | * gfs2_internal_read - read an internal file | |
571 | * @ip: The gfs2 inode | |
51ff87bd SW |
572 | * @buf: The buffer to fill |
573 | * @pos: The file position | |
574 | * @size: The amount to read | |
575 | * | |
576 | */ | |
577 | ||
4306629e AP |
578 | int gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos, |
579 | unsigned size) | |
51ff87bd SW |
580 | { |
581 | struct address_space *mapping = ip->i_inode.i_mapping; | |
09cbfeaf KS |
582 | unsigned long index = *pos / PAGE_SIZE; |
583 | unsigned offset = *pos & (PAGE_SIZE - 1); | |
51ff87bd SW |
584 | unsigned copied = 0; |
585 | unsigned amt; | |
586 | struct page *page; | |
587 | void *p; | |
588 | ||
589 | do { | |
590 | amt = size - copied; | |
09cbfeaf KS |
591 | if (offset + size > PAGE_SIZE) |
592 | amt = PAGE_SIZE - offset; | |
51ff87bd SW |
593 | page = read_cache_page(mapping, index, __gfs2_readpage, NULL); |
594 | if (IS_ERR(page)) | |
595 | return PTR_ERR(page); | |
d9349285 | 596 | p = kmap_atomic(page); |
51ff87bd | 597 | memcpy(buf + copied, p + offset, amt); |
d9349285 | 598 | kunmap_atomic(p); |
09cbfeaf | 599 | put_page(page); |
51ff87bd SW |
600 | copied += amt; |
601 | index++; | |
602 | offset = 0; | |
603 | } while(copied < size); | |
604 | (*pos) += size; | |
605 | return size; | |
fd88de56 SW |
606 | } |
607 | ||
fd88de56 SW |
608 | /** |
609 | * gfs2_readpages - Read a bunch of pages at once | |
1272574b FF |
610 | * @file: The file to read from |
611 | * @mapping: Address space info | |
612 | * @pages: List of pages to read | |
613 | * @nr_pages: Number of pages to read | |
fd88de56 SW |
614 | * |
615 | * Some notes: | |
616 | * 1. This is only for readahead, so we can simply ignore any things | |
617 | * which are slightly inconvenient (such as locking conflicts between | |
618 | * the page lock and the glock) and return having done no I/O. Its | |
619 | * obviously not something we'd want to do on too regular a basis. | |
620 | * Any I/O we ignore at this time will be done via readpage later. | |
e1d5b18a | 621 | * 2. We don't handle stuffed files here we let readpage do the honours. |
fd88de56 | 622 | * 3. mpage_readpages() does most of the heavy lifting in the common case. |
e9e1ef2b | 623 | * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places. |
fd88de56 | 624 | */ |
3cc3f710 | 625 | |
fd88de56 SW |
626 | static int gfs2_readpages(struct file *file, struct address_space *mapping, |
627 | struct list_head *pages, unsigned nr_pages) | |
628 | { | |
629 | struct inode *inode = mapping->host; | |
feaa7bba SW |
630 | struct gfs2_inode *ip = GFS2_I(inode); |
631 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
fd88de56 | 632 | struct gfs2_holder gh; |
3cc3f710 | 633 | int ret; |
fd88de56 | 634 | |
719ee344 SW |
635 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
636 | ret = gfs2_glock_nq(&gh); | |
51ff87bd | 637 | if (unlikely(ret)) |
3cc3f710 | 638 | goto out_uninit; |
e1d5b18a | 639 | if (!gfs2_is_stuffed(ip)) |
e9e1ef2b | 640 | ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map); |
3cc3f710 SW |
641 | gfs2_glock_dq(&gh); |
642 | out_uninit: | |
643 | gfs2_holder_uninit(&gh); | |
fd88de56 SW |
644 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
645 | ret = -EIO; | |
646 | return ret; | |
b3b94faa DT |
647 | } |
648 | ||
649 | /** | |
7765ec26 | 650 | * gfs2_write_begin - Begin to write to a file |
b3b94faa | 651 | * @file: The file to write to |
7765ec26 SW |
652 | * @mapping: The mapping in which to write |
653 | * @pos: The file offset at which to start writing | |
654 | * @len: Length of the write | |
655 | * @flags: Various flags | |
656 | * @pagep: Pointer to return the page | |
657 | * @fsdata: Pointer to return fs data (unused by GFS2) | |
b3b94faa DT |
658 | * |
659 | * Returns: errno | |
660 | */ | |
661 | ||
7765ec26 SW |
662 | static int gfs2_write_begin(struct file *file, struct address_space *mapping, |
663 | loff_t pos, unsigned len, unsigned flags, | |
664 | struct page **pagep, void **fsdata) | |
b3b94faa | 665 | { |
7765ec26 SW |
666 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
667 | struct gfs2_sbd *sdp = GFS2_SB(mapping->host); | |
1946f70a | 668 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
7ed122e4 | 669 | unsigned int data_blocks = 0, ind_blocks = 0, rblocks; |
71f890f7 | 670 | unsigned requested = 0; |
18ec7d5c | 671 | int alloc_required; |
b3b94faa | 672 | int error = 0; |
09cbfeaf KS |
673 | pgoff_t index = pos >> PAGE_SHIFT; |
674 | unsigned from = pos & (PAGE_SIZE - 1); | |
7765ec26 | 675 | struct page *page; |
52ae7b79 | 676 | |
719ee344 SW |
677 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh); |
678 | error = gfs2_glock_nq(&ip->i_gh); | |
7765ec26 | 679 | if (unlikely(error)) |
18ec7d5c | 680 | goto out_uninit; |
1946f70a BM |
681 | if (&ip->i_inode == sdp->sd_rindex) { |
682 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, | |
683 | GL_NOCACHE, &m_ip->i_gh); | |
684 | if (unlikely(error)) { | |
685 | gfs2_glock_dq(&ip->i_gh); | |
686 | goto out_uninit; | |
687 | } | |
688 | } | |
b3b94faa | 689 | |
461cb419 | 690 | alloc_required = gfs2_write_alloc_required(ip, pos, len); |
18ec7d5c | 691 | |
7ed122e4 SW |
692 | if (alloc_required || gfs2_is_jdata(ip)) |
693 | gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks); | |
694 | ||
18ec7d5c | 695 | if (alloc_required) { |
7b9cff46 | 696 | struct gfs2_alloc_parms ap = { .aflags = 0, }; |
b8fbf471 AD |
697 | requested = data_blocks + ind_blocks; |
698 | ap.target = requested; | |
699 | error = gfs2_quota_lock_check(ip, &ap); | |
18ec7d5c | 700 | if (error) |
5407e242 | 701 | goto out_unlock; |
18ec7d5c | 702 | |
7b9cff46 | 703 | error = gfs2_inplace_reserve(ip, &ap); |
18ec7d5c SW |
704 | if (error) |
705 | goto out_qunlock; | |
706 | } | |
707 | ||
708 | rblocks = RES_DINODE + ind_blocks; | |
709 | if (gfs2_is_jdata(ip)) | |
710 | rblocks += data_blocks ? data_blocks : 1; | |
711 | if (ind_blocks || data_blocks) | |
712 | rblocks += RES_STATFS + RES_QUOTA; | |
1946f70a BM |
713 | if (&ip->i_inode == sdp->sd_rindex) |
714 | rblocks += 2 * RES_STATFS; | |
bf97b673 | 715 | if (alloc_required) |
71f890f7 | 716 | rblocks += gfs2_rg_blocks(ip, requested); |
18ec7d5c | 717 | |
16615be1 | 718 | error = gfs2_trans_begin(sdp, rblocks, |
09cbfeaf | 719 | PAGE_SIZE/sdp->sd_sb.sb_bsize); |
18ec7d5c | 720 | if (error) |
a867bb28 | 721 | goto out_trans_fail; |
18ec7d5c | 722 | |
c41d4f09 | 723 | error = -ENOMEM; |
e4fefbac | 724 | flags |= AOP_FLAG_NOFS; |
54566b2c | 725 | page = grab_cache_page_write_begin(mapping, index, flags); |
c41d4f09 SW |
726 | *pagep = page; |
727 | if (unlikely(!page)) | |
728 | goto out_endtrans; | |
729 | ||
18ec7d5c | 730 | if (gfs2_is_stuffed(ip)) { |
c41d4f09 | 731 | error = 0; |
7765ec26 | 732 | if (pos + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { |
f25ef0c1 | 733 | error = gfs2_unstuff_dinode(ip, page); |
5c4e9e03 SW |
734 | if (error == 0) |
735 | goto prepare_write; | |
c41d4f09 | 736 | } else if (!PageUptodate(page)) { |
b3b94faa | 737 | error = stuffed_readpage(ip, page); |
c41d4f09 | 738 | } |
5c4e9e03 | 739 | goto out; |
18ec7d5c SW |
740 | } |
741 | ||
5c4e9e03 | 742 | prepare_write: |
ebdec241 | 743 | error = __block_write_begin(page, from, len, gfs2_block_map); |
18ec7d5c | 744 | out: |
c41d4f09 SW |
745 | if (error == 0) |
746 | return 0; | |
747 | ||
6c474f7b | 748 | unlock_page(page); |
09cbfeaf | 749 | put_page(page); |
15c6fd97 | 750 | |
ff8f33c8 | 751 | gfs2_trans_end(sdp); |
c41d4f09 | 752 | if (pos + len > ip->i_inode.i_size) |
ff8f33c8 SW |
753 | gfs2_trim_blocks(&ip->i_inode); |
754 | goto out_trans_fail; | |
755 | ||
c41d4f09 SW |
756 | out_endtrans: |
757 | gfs2_trans_end(sdp); | |
a867bb28 | 758 | out_trans_fail: |
c41d4f09 SW |
759 | if (alloc_required) { |
760 | gfs2_inplace_release(ip); | |
18ec7d5c | 761 | out_qunlock: |
c41d4f09 | 762 | gfs2_quota_unlock(ip); |
c41d4f09 | 763 | } |
18ec7d5c | 764 | out_unlock: |
1946f70a BM |
765 | if (&ip->i_inode == sdp->sd_rindex) { |
766 | gfs2_glock_dq(&m_ip->i_gh); | |
767 | gfs2_holder_uninit(&m_ip->i_gh); | |
768 | } | |
c41d4f09 | 769 | gfs2_glock_dq(&ip->i_gh); |
18ec7d5c | 770 | out_uninit: |
c41d4f09 | 771 | gfs2_holder_uninit(&ip->i_gh); |
b3b94faa DT |
772 | return error; |
773 | } | |
774 | ||
7ae8fa84 RP |
775 | /** |
776 | * adjust_fs_space - Adjusts the free space available due to gfs2_grow | |
777 | * @inode: the rindex inode | |
778 | */ | |
779 | static void adjust_fs_space(struct inode *inode) | |
780 | { | |
781 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; | |
1946f70a BM |
782 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
783 | struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); | |
7ae8fa84 RP |
784 | struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; |
785 | struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; | |
1946f70a | 786 | struct buffer_head *m_bh, *l_bh; |
7ae8fa84 RP |
787 | u64 fs_total, new_free; |
788 | ||
789 | /* Total up the file system space, according to the latest rindex. */ | |
790 | fs_total = gfs2_ri_total(sdp); | |
1946f70a BM |
791 | if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0) |
792 | return; | |
7ae8fa84 RP |
793 | |
794 | spin_lock(&sdp->sd_statfs_spin); | |
1946f70a BM |
795 | gfs2_statfs_change_in(m_sc, m_bh->b_data + |
796 | sizeof(struct gfs2_dinode)); | |
7ae8fa84 RP |
797 | if (fs_total > (m_sc->sc_total + l_sc->sc_total)) |
798 | new_free = fs_total - (m_sc->sc_total + l_sc->sc_total); | |
799 | else | |
800 | new_free = 0; | |
801 | spin_unlock(&sdp->sd_statfs_spin); | |
6c53267f RP |
802 | fs_warn(sdp, "File system extended by %llu blocks.\n", |
803 | (unsigned long long)new_free); | |
7ae8fa84 | 804 | gfs2_statfs_change(sdp, new_free, new_free, 0); |
1946f70a BM |
805 | |
806 | if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0) | |
807 | goto out; | |
808 | update_statfs(sdp, m_bh, l_bh); | |
809 | brelse(l_bh); | |
810 | out: | |
811 | brelse(m_bh); | |
7ae8fa84 RP |
812 | } |
813 | ||
b3b94faa | 814 | /** |
7765ec26 SW |
815 | * gfs2_stuffed_write_end - Write end for stuffed files |
816 | * @inode: The inode | |
817 | * @dibh: The buffer_head containing the on-disk inode | |
818 | * @pos: The file position | |
819 | * @len: The length of the write | |
820 | * @copied: How much was actually copied by the VFS | |
821 | * @page: The page | |
822 | * | |
823 | * This copies the data from the page into the inode block after | |
824 | * the inode data structure itself. | |
825 | * | |
826 | * Returns: errno | |
827 | */ | |
828 | static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh, | |
829 | loff_t pos, unsigned len, unsigned copied, | |
830 | struct page *page) | |
831 | { | |
832 | struct gfs2_inode *ip = GFS2_I(inode); | |
833 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
1946f70a | 834 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
7765ec26 SW |
835 | u64 to = pos + copied; |
836 | void *kaddr; | |
837 | unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode); | |
7765ec26 SW |
838 | |
839 | BUG_ON((pos + len) > (dibh->b_size - sizeof(struct gfs2_dinode))); | |
d9349285 | 840 | kaddr = kmap_atomic(page); |
7765ec26 SW |
841 | memcpy(buf + pos, kaddr + pos, copied); |
842 | memset(kaddr + pos + copied, 0, len - copied); | |
843 | flush_dcache_page(page); | |
d9349285 | 844 | kunmap_atomic(kaddr); |
7765ec26 SW |
845 | |
846 | if (!PageUptodate(page)) | |
847 | SetPageUptodate(page); | |
848 | unlock_page(page); | |
09cbfeaf | 849 | put_page(page); |
7765ec26 | 850 | |
7537d81a | 851 | if (copied) { |
a2e0f799 | 852 | if (inode->i_size < to) |
7537d81a | 853 | i_size_write(inode, to); |
7765ec26 SW |
854 | mark_inode_dirty(inode); |
855 | } | |
856 | ||
9ae3c6de | 857 | if (inode == sdp->sd_rindex) { |
7765ec26 | 858 | adjust_fs_space(inode); |
ca9248d8 | 859 | sdp->sd_rindex_uptodate = 0; |
9ae3c6de | 860 | } |
7765ec26 SW |
861 | |
862 | brelse(dibh); | |
863 | gfs2_trans_end(sdp); | |
1946f70a BM |
864 | if (inode == sdp->sd_rindex) { |
865 | gfs2_glock_dq(&m_ip->i_gh); | |
866 | gfs2_holder_uninit(&m_ip->i_gh); | |
867 | } | |
7765ec26 SW |
868 | gfs2_glock_dq(&ip->i_gh); |
869 | gfs2_holder_uninit(&ip->i_gh); | |
870 | return copied; | |
871 | } | |
872 | ||
873 | /** | |
874 | * gfs2_write_end | |
b3b94faa | 875 | * @file: The file to write to |
7765ec26 SW |
876 | * @mapping: The address space to write to |
877 | * @pos: The file position | |
878 | * @len: The length of the data | |
1272574b | 879 | * @copied: How much was actually copied by the VFS |
7765ec26 SW |
880 | * @page: The page that has been written |
881 | * @fsdata: The fsdata (unused in GFS2) | |
882 | * | |
883 | * The main write_end function for GFS2. We have a separate one for | |
884 | * stuffed files as they are slightly different, otherwise we just | |
885 | * put our locking around the VFS provided functions. | |
b3b94faa DT |
886 | * |
887 | * Returns: errno | |
888 | */ | |
889 | ||
7765ec26 SW |
890 | static int gfs2_write_end(struct file *file, struct address_space *mapping, |
891 | loff_t pos, unsigned len, unsigned copied, | |
892 | struct page *page, void *fsdata) | |
b3b94faa DT |
893 | { |
894 | struct inode *inode = page->mapping->host; | |
feaa7bba SW |
895 | struct gfs2_inode *ip = GFS2_I(inode); |
896 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
1946f70a | 897 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
18ec7d5c | 898 | struct buffer_head *dibh; |
09cbfeaf | 899 | unsigned int from = pos & (PAGE_SIZE - 1); |
7765ec26 SW |
900 | unsigned int to = from + len; |
901 | int ret; | |
0c901809 BM |
902 | struct gfs2_trans *tr = current->journal_info; |
903 | BUG_ON(!tr); | |
b3b94faa | 904 | |
7afd88d9 | 905 | BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL); |
18ec7d5c | 906 | |
7765ec26 SW |
907 | ret = gfs2_meta_inode_buffer(ip, &dibh); |
908 | if (unlikely(ret)) { | |
909 | unlock_page(page); | |
09cbfeaf | 910 | put_page(page); |
7765ec26 SW |
911 | goto failed; |
912 | } | |
18ec7d5c | 913 | |
7765ec26 SW |
914 | if (gfs2_is_stuffed(ip)) |
915 | return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page); | |
b3b94faa | 916 | |
bf36a713 | 917 | if (!gfs2_is_writeback(ip)) |
7765ec26 | 918 | gfs2_page_add_databufs(ip, page, from, to); |
b3b94faa | 919 | |
7765ec26 | 920 | ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); |
0c901809 BM |
921 | if (tr->tr_num_buf_new) |
922 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); | |
923 | else | |
924 | gfs2_trans_add_meta(ip->i_gl, dibh); | |
925 | ||
48516ced | 926 | |
9ae3c6de | 927 | if (inode == sdp->sd_rindex) { |
7ae8fa84 | 928 | adjust_fs_space(inode); |
ca9248d8 | 929 | sdp->sd_rindex_uptodate = 0; |
9ae3c6de | 930 | } |
7ae8fa84 | 931 | |
18ec7d5c | 932 | brelse(dibh); |
7765ec26 | 933 | failed: |
deab72d3 | 934 | gfs2_trans_end(sdp); |
71f890f7 | 935 | gfs2_inplace_release(ip); |
b54e9a0b | 936 | if (ip->i_qadata && ip->i_qadata->qa_qd_num) |
18ec7d5c | 937 | gfs2_quota_unlock(ip); |
1946f70a BM |
938 | if (inode == sdp->sd_rindex) { |
939 | gfs2_glock_dq(&m_ip->i_gh); | |
940 | gfs2_holder_uninit(&m_ip->i_gh); | |
941 | } | |
7765ec26 | 942 | gfs2_glock_dq(&ip->i_gh); |
18ec7d5c | 943 | gfs2_holder_uninit(&ip->i_gh); |
7765ec26 | 944 | return ret; |
b3b94faa DT |
945 | } |
946 | ||
8fb68595 RP |
947 | /** |
948 | * gfs2_set_page_dirty - Page dirtying function | |
949 | * @page: The page to dirty | |
950 | * | |
951 | * Returns: 1 if it dirtyed the page, or 0 otherwise | |
952 | */ | |
953 | ||
954 | static int gfs2_set_page_dirty(struct page *page) | |
955 | { | |
5561093e | 956 | SetPageChecked(page); |
8fb68595 RP |
957 | return __set_page_dirty_buffers(page); |
958 | } | |
959 | ||
b3b94faa DT |
960 | /** |
961 | * gfs2_bmap - Block map function | |
962 | * @mapping: Address space info | |
963 | * @lblock: The block to map | |
964 | * | |
965 | * Returns: The disk address for the block or 0 on hole or error | |
966 | */ | |
967 | ||
968 | static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) | |
969 | { | |
feaa7bba | 970 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
b3b94faa DT |
971 | struct gfs2_holder i_gh; |
972 | sector_t dblock = 0; | |
973 | int error; | |
974 | ||
b3b94faa DT |
975 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
976 | if (error) | |
977 | return 0; | |
978 | ||
979 | if (!gfs2_is_stuffed(ip)) | |
e9e1ef2b | 980 | dblock = generic_block_bmap(mapping, lblock, gfs2_block_map); |
b3b94faa DT |
981 | |
982 | gfs2_glock_dq_uninit(&i_gh); | |
983 | ||
984 | return dblock; | |
985 | } | |
986 | ||
d7b616e2 SW |
987 | static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh) |
988 | { | |
989 | struct gfs2_bufdata *bd; | |
990 | ||
991 | lock_buffer(bh); | |
992 | gfs2_log_lock(sdp); | |
993 | clear_buffer_dirty(bh); | |
994 | bd = bh->b_private; | |
995 | if (bd) { | |
c0752aa7 BP |
996 | if (!list_empty(&bd->bd_list) && !buffer_pinned(bh)) |
997 | list_del_init(&bd->bd_list); | |
16615be1 | 998 | else |
68cd4ce2 | 999 | gfs2_remove_from_journal(bh, REMOVE_JDATA); |
d7b616e2 SW |
1000 | } |
1001 | bh->b_bdev = NULL; | |
1002 | clear_buffer_mapped(bh); | |
1003 | clear_buffer_req(bh); | |
1004 | clear_buffer_new(bh); | |
1005 | gfs2_log_unlock(sdp); | |
1006 | unlock_buffer(bh); | |
1007 | } | |
1008 | ||
d47992f8 LC |
1009 | static void gfs2_invalidatepage(struct page *page, unsigned int offset, |
1010 | unsigned int length) | |
b3b94faa | 1011 | { |
d7b616e2 | 1012 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); |
5c0bb97c | 1013 | unsigned int stop = offset + length; |
09cbfeaf | 1014 | int partial_page = (offset || length < PAGE_SIZE); |
d7b616e2 SW |
1015 | struct buffer_head *bh, *head; |
1016 | unsigned long pos = 0; | |
1017 | ||
b3b94faa | 1018 | BUG_ON(!PageLocked(page)); |
5c0bb97c | 1019 | if (!partial_page) |
8fb68595 | 1020 | ClearPageChecked(page); |
d7b616e2 SW |
1021 | if (!page_has_buffers(page)) |
1022 | goto out; | |
b3b94faa | 1023 | |
d7b616e2 SW |
1024 | bh = head = page_buffers(page); |
1025 | do { | |
5c0bb97c LC |
1026 | if (pos + bh->b_size > stop) |
1027 | return; | |
1028 | ||
d7b616e2 SW |
1029 | if (offset <= pos) |
1030 | gfs2_discard(sdp, bh); | |
1031 | pos += bh->b_size; | |
1032 | bh = bh->b_this_page; | |
1033 | } while (bh != head); | |
1034 | out: | |
5c0bb97c | 1035 | if (!partial_page) |
d7b616e2 | 1036 | try_to_release_page(page, 0); |
b3b94faa DT |
1037 | } |
1038 | ||
c7b33834 SW |
1039 | /** |
1040 | * gfs2_ok_for_dio - check that dio is valid on this file | |
1041 | * @ip: The inode | |
c7b33834 SW |
1042 | * @offset: The offset at which we are reading or writing |
1043 | * | |
1044 | * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o) | |
1045 | * 1 (to accept the i/o request) | |
1046 | */ | |
6f673763 | 1047 | static int gfs2_ok_for_dio(struct gfs2_inode *ip, loff_t offset) |
c7b33834 SW |
1048 | { |
1049 | /* | |
1050 | * Should we return an error here? I can't see that O_DIRECT for | |
5561093e SW |
1051 | * a stuffed file makes any sense. For now we'll silently fall |
1052 | * back to buffered I/O | |
c7b33834 | 1053 | */ |
c7b33834 SW |
1054 | if (gfs2_is_stuffed(ip)) |
1055 | return 0; | |
1056 | ||
acb57a36 | 1057 | if (offset >= i_size_read(&ip->i_inode)) |
c7b33834 SW |
1058 | return 0; |
1059 | return 1; | |
1060 | } | |
1061 | ||
1062 | ||
1063 | ||
c8b8e32d | 1064 | static ssize_t gfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter) |
d1665e41 SW |
1065 | { |
1066 | struct file *file = iocb->ki_filp; | |
1067 | struct inode *inode = file->f_mapping->host; | |
dfd11184 | 1068 | struct address_space *mapping = inode->i_mapping; |
feaa7bba | 1069 | struct gfs2_inode *ip = GFS2_I(inode); |
c8b8e32d | 1070 | loff_t offset = iocb->ki_pos; |
d1665e41 SW |
1071 | struct gfs2_holder gh; |
1072 | int rv; | |
1073 | ||
1074 | /* | |
c7b33834 SW |
1075 | * Deferred lock, even if its a write, since we do no allocation |
1076 | * on this path. All we need change is atime, and this lock mode | |
1077 | * ensures that other nodes have flushed their buffered read caches | |
1078 | * (i.e. their page cache entries for this inode). We do not, | |
1079 | * unfortunately have the option of only flushing a range like | |
1080 | * the VFS does. | |
d1665e41 | 1081 | */ |
719ee344 SW |
1082 | gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh); |
1083 | rv = gfs2_glock_nq(&gh); | |
d1665e41 | 1084 | if (rv) |
9c7fe835 | 1085 | goto out_uninit; |
6f673763 | 1086 | rv = gfs2_ok_for_dio(ip, offset); |
c7b33834 SW |
1087 | if (rv != 1) |
1088 | goto out; /* dio not valid, fall back to buffered i/o */ | |
1089 | ||
dfd11184 SW |
1090 | /* |
1091 | * Now since we are holding a deferred (CW) lock at this point, you | |
1092 | * might be wondering why this is ever needed. There is a case however | |
1093 | * where we've granted a deferred local lock against a cached exclusive | |
1094 | * glock. That is ok provided all granted local locks are deferred, but | |
1095 | * it also means that it is possible to encounter pages which are | |
1096 | * cached and possibly also mapped. So here we check for that and sort | |
1097 | * them out ahead of the dio. The glock state machine will take care of | |
1098 | * everything else. | |
1099 | * | |
1100 | * If in fact the cached glock state (gl->gl_state) is deferred (CW) in | |
1101 | * the first place, mapping->nr_pages will always be zero. | |
1102 | */ | |
1103 | if (mapping->nrpages) { | |
09cbfeaf | 1104 | loff_t lstart = offset & ~(PAGE_SIZE - 1); |
a6cbcd4a | 1105 | loff_t len = iov_iter_count(iter); |
dfd11184 SW |
1106 | loff_t end = PAGE_ALIGN(offset + len) - 1; |
1107 | ||
1108 | rv = 0; | |
1109 | if (len == 0) | |
1110 | goto out; | |
1111 | if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags)) | |
1112 | unmap_shared_mapping_range(ip->i_inode.i_mapping, offset, len); | |
1113 | rv = filemap_write_and_wait_range(mapping, lstart, end); | |
1114 | if (rv) | |
086352f1 | 1115 | goto out; |
6f673763 | 1116 | if (iov_iter_rw(iter) == WRITE) |
086352f1 | 1117 | truncate_inode_pages_range(mapping, lstart, end); |
dfd11184 SW |
1118 | } |
1119 | ||
17f8c842 | 1120 | rv = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter, |
c8b8e32d | 1121 | gfs2_get_block_direct, NULL, NULL, 0); |
d1665e41 | 1122 | out: |
8e711e10 | 1123 | gfs2_glock_dq(&gh); |
9c7fe835 | 1124 | out_uninit: |
d1665e41 | 1125 | gfs2_holder_uninit(&gh); |
d1665e41 SW |
1126 | return rv; |
1127 | } | |
1128 | ||
4340fe62 | 1129 | /** |
623d9355 | 1130 | * gfs2_releasepage - free the metadata associated with a page |
4340fe62 SW |
1131 | * @page: the page that's being released |
1132 | * @gfp_mask: passed from Linux VFS, ignored by us | |
1133 | * | |
1134 | * Call try_to_free_buffers() if the buffers in this page can be | |
1135 | * released. | |
1136 | * | |
1137 | * Returns: 0 | |
1138 | */ | |
1139 | ||
1140 | int gfs2_releasepage(struct page *page, gfp_t gfp_mask) | |
1141 | { | |
009d8518 SW |
1142 | struct address_space *mapping = page->mapping; |
1143 | struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); | |
4340fe62 SW |
1144 | struct buffer_head *bh, *head; |
1145 | struct gfs2_bufdata *bd; | |
4340fe62 SW |
1146 | |
1147 | if (!page_has_buffers(page)) | |
891ba6d4 | 1148 | return 0; |
4340fe62 | 1149 | |
1c185c02 AG |
1150 | /* |
1151 | * From xfs_vm_releasepage: mm accommodates an old ext3 case where | |
1152 | * clean pages might not have had the dirty bit cleared. Thus, it can | |
1153 | * send actual dirty pages to ->releasepage() via shrink_active_list(). | |
1154 | * | |
1155 | * As a workaround, we skip pages that contain dirty buffers below. | |
1156 | * Once ->releasepage isn't called on dirty pages anymore, we can warn | |
1157 | * on dirty buffers like we used to here again. | |
1158 | */ | |
1159 | ||
bb3b0e3d | 1160 | gfs2_log_lock(sdp); |
380f7c65 | 1161 | spin_lock(&sdp->sd_ail_lock); |
4340fe62 SW |
1162 | head = bh = page_buffers(page); |
1163 | do { | |
bb3b0e3d SW |
1164 | if (atomic_read(&bh->b_count)) |
1165 | goto cannot_release; | |
1166 | bd = bh->b_private; | |
16ca9412 | 1167 | if (bd && bd->bd_tr) |
bb3b0e3d | 1168 | goto cannot_release; |
1c185c02 AG |
1169 | if (buffer_dirty(bh) || WARN_ON(buffer_pinned(bh))) |
1170 | goto cannot_release; | |
bb3b0e3d SW |
1171 | bh = bh->b_this_page; |
1172 | } while(bh != head); | |
380f7c65 | 1173 | spin_unlock(&sdp->sd_ail_lock); |
4340fe62 | 1174 | |
bb3b0e3d SW |
1175 | head = bh = page_buffers(page); |
1176 | do { | |
4340fe62 SW |
1177 | bd = bh->b_private; |
1178 | if (bd) { | |
1179 | gfs2_assert_warn(sdp, bd->bd_bh == bh); | |
e4f29206 SW |
1180 | if (!list_empty(&bd->bd_list)) |
1181 | list_del_init(&bd->bd_list); | |
1182 | bd->bd_bh = NULL; | |
4340fe62 | 1183 | bh->b_private = NULL; |
623d9355 | 1184 | kmem_cache_free(gfs2_bufdata_cachep, bd); |
e4f29206 | 1185 | } |
4340fe62 SW |
1186 | |
1187 | bh = bh->b_this_page; | |
166afccd | 1188 | } while (bh != head); |
e4f29206 | 1189 | gfs2_log_unlock(sdp); |
4340fe62 | 1190 | |
4340fe62 | 1191 | return try_to_free_buffers(page); |
8f065d36 | 1192 | |
bb3b0e3d | 1193 | cannot_release: |
380f7c65 | 1194 | spin_unlock(&sdp->sd_ail_lock); |
bb3b0e3d SW |
1195 | gfs2_log_unlock(sdp); |
1196 | return 0; | |
4340fe62 SW |
1197 | } |
1198 | ||
5561093e | 1199 | static const struct address_space_operations gfs2_writeback_aops = { |
9d358143 | 1200 | .writepage = gfs2_writepage, |
45138990 | 1201 | .writepages = gfs2_writepages, |
5561093e SW |
1202 | .readpage = gfs2_readpage, |
1203 | .readpages = gfs2_readpages, | |
5561093e SW |
1204 | .write_begin = gfs2_write_begin, |
1205 | .write_end = gfs2_write_end, | |
1206 | .bmap = gfs2_bmap, | |
1207 | .invalidatepage = gfs2_invalidatepage, | |
1208 | .releasepage = gfs2_releasepage, | |
1209 | .direct_IO = gfs2_direct_IO, | |
e5d9dc27 | 1210 | .migratepage = buffer_migrate_page, |
229615de | 1211 | .is_partially_uptodate = block_is_partially_uptodate, |
aa261f54 | 1212 | .error_remove_page = generic_error_remove_page, |
5561093e SW |
1213 | }; |
1214 | ||
1215 | static const struct address_space_operations gfs2_ordered_aops = { | |
9d358143 | 1216 | .writepage = gfs2_writepage, |
45138990 | 1217 | .writepages = gfs2_writepages, |
b3b94faa | 1218 | .readpage = gfs2_readpage, |
fd88de56 | 1219 | .readpages = gfs2_readpages, |
7765ec26 SW |
1220 | .write_begin = gfs2_write_begin, |
1221 | .write_end = gfs2_write_end, | |
8fb68595 | 1222 | .set_page_dirty = gfs2_set_page_dirty, |
b3b94faa DT |
1223 | .bmap = gfs2_bmap, |
1224 | .invalidatepage = gfs2_invalidatepage, | |
4340fe62 | 1225 | .releasepage = gfs2_releasepage, |
b3b94faa | 1226 | .direct_IO = gfs2_direct_IO, |
e5d9dc27 | 1227 | .migratepage = buffer_migrate_page, |
229615de | 1228 | .is_partially_uptodate = block_is_partially_uptodate, |
aa261f54 | 1229 | .error_remove_page = generic_error_remove_page, |
b3b94faa DT |
1230 | }; |
1231 | ||
5561093e | 1232 | static const struct address_space_operations gfs2_jdata_aops = { |
9ff8ec32 | 1233 | .writepage = gfs2_jdata_writepage, |
b8e7cbb6 | 1234 | .writepages = gfs2_jdata_writepages, |
5561093e SW |
1235 | .readpage = gfs2_readpage, |
1236 | .readpages = gfs2_readpages, | |
5561093e SW |
1237 | .write_begin = gfs2_write_begin, |
1238 | .write_end = gfs2_write_end, | |
1239 | .set_page_dirty = gfs2_set_page_dirty, | |
1240 | .bmap = gfs2_bmap, | |
1241 | .invalidatepage = gfs2_invalidatepage, | |
1242 | .releasepage = gfs2_releasepage, | |
229615de | 1243 | .is_partially_uptodate = block_is_partially_uptodate, |
aa261f54 | 1244 | .error_remove_page = generic_error_remove_page, |
5561093e SW |
1245 | }; |
1246 | ||
1247 | void gfs2_set_aops(struct inode *inode) | |
1248 | { | |
1249 | struct gfs2_inode *ip = GFS2_I(inode); | |
1250 | ||
1251 | if (gfs2_is_writeback(ip)) | |
1252 | inode->i_mapping->a_ops = &gfs2_writeback_aops; | |
1253 | else if (gfs2_is_ordered(ip)) | |
1254 | inode->i_mapping->a_ops = &gfs2_ordered_aops; | |
1255 | else if (gfs2_is_jdata(ip)) | |
1256 | inode->i_mapping->a_ops = &gfs2_jdata_aops; | |
1257 | else | |
1258 | BUG(); | |
1259 | } | |
1260 |