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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 | 41 | static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page, |
88b65ce5 | 42 | unsigned int from, unsigned int len) |
ba7f7290 SW |
43 | { |
44 | struct buffer_head *head = page_buffers(page); | |
45 | unsigned int bsize = head->b_size; | |
46 | struct buffer_head *bh; | |
88b65ce5 | 47 | unsigned int to = from + len; |
ba7f7290 SW |
48 | unsigned int start, end; |
49 | ||
50 | for (bh = head, start = 0; bh != head || !start; | |
51 | bh = bh->b_this_page, start = end) { | |
52 | end = start + bsize; | |
88b65ce5 | 53 | if (end <= from) |
ba7f7290 | 54 | continue; |
88b65ce5 AG |
55 | if (start >= to) |
56 | break; | |
ddf4b426 BM |
57 | if (gfs2_is_jdata(ip)) |
58 | set_buffer_uptodate(bh); | |
350a9b0a | 59 | gfs2_trans_add_data(ip->i_gl, bh); |
ba7f7290 SW |
60 | } |
61 | } | |
62 | ||
b3b94faa | 63 | /** |
7a6bbacb | 64 | * gfs2_get_block_noalloc - Fills in a buffer head with details about a block |
b3b94faa DT |
65 | * @inode: The inode |
66 | * @lblock: The block number to look up | |
67 | * @bh_result: The buffer head to return the result in | |
68 | * @create: Non-zero if we may add block to the file | |
69 | * | |
70 | * Returns: errno | |
71 | */ | |
72 | ||
7a6bbacb SW |
73 | static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock, |
74 | struct buffer_head *bh_result, int create) | |
b3b94faa | 75 | { |
b3b94faa DT |
76 | int error; |
77 | ||
e9e1ef2b | 78 | error = gfs2_block_map(inode, lblock, bh_result, 0); |
b3b94faa DT |
79 | if (error) |
80 | return error; | |
de986e85 | 81 | if (!buffer_mapped(bh_result)) |
7a6bbacb SW |
82 | return -EIO; |
83 | return 0; | |
b3b94faa DT |
84 | } |
85 | ||
7a6bbacb SW |
86 | static int gfs2_get_block_direct(struct inode *inode, sector_t lblock, |
87 | struct buffer_head *bh_result, int create) | |
623d9355 | 88 | { |
e9e1ef2b | 89 | return gfs2_block_map(inode, lblock, bh_result, 0); |
623d9355 | 90 | } |
7a6bbacb | 91 | |
b3b94faa | 92 | /** |
9ff8ec32 SW |
93 | * gfs2_writepage_common - Common bits of writepage |
94 | * @page: The page to be written | |
95 | * @wbc: The writeback control | |
b3b94faa | 96 | * |
9ff8ec32 | 97 | * Returns: 1 if writepage is ok, otherwise an error code or zero if no error. |
b3b94faa DT |
98 | */ |
99 | ||
9ff8ec32 SW |
100 | static int gfs2_writepage_common(struct page *page, |
101 | struct writeback_control *wbc) | |
b3b94faa | 102 | { |
18ec7d5c | 103 | struct inode *inode = page->mapping->host; |
f4387149 SW |
104 | struct gfs2_inode *ip = GFS2_I(inode); |
105 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
18ec7d5c | 106 | loff_t i_size = i_size_read(inode); |
09cbfeaf | 107 | pgoff_t end_index = i_size >> PAGE_SHIFT; |
18ec7d5c | 108 | unsigned offset; |
b3b94faa | 109 | |
9ff8ec32 SW |
110 | if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) |
111 | goto out; | |
5c676f6d | 112 | if (current->journal_info) |
9ff8ec32 | 113 | goto redirty; |
18ec7d5c | 114 | /* Is the page fully outside i_size? (truncate in progress) */ |
09cbfeaf | 115 | offset = i_size & (PAGE_SIZE-1); |
d2d7b8a2 | 116 | if (page->index > end_index || (page->index == end_index && !offset)) { |
09cbfeaf | 117 | page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); |
9ff8ec32 | 118 | goto out; |
b3b94faa | 119 | } |
9ff8ec32 SW |
120 | return 1; |
121 | redirty: | |
122 | redirty_page_for_writepage(wbc, page); | |
123 | out: | |
124 | unlock_page(page); | |
125 | return 0; | |
126 | } | |
127 | ||
128 | /** | |
9d358143 | 129 | * gfs2_writepage - Write page for writeback mappings |
9ff8ec32 SW |
130 | * @page: The page |
131 | * @wbc: The writeback control | |
132 | * | |
133 | */ | |
134 | ||
9d358143 | 135 | static int gfs2_writepage(struct page *page, struct writeback_control *wbc) |
9ff8ec32 SW |
136 | { |
137 | int ret; | |
138 | ||
139 | ret = gfs2_writepage_common(page, wbc); | |
140 | if (ret <= 0) | |
141 | return ret; | |
142 | ||
30116ff6 | 143 | return nobh_writepage(page, gfs2_get_block_noalloc, wbc); |
9ff8ec32 SW |
144 | } |
145 | ||
fd4c5748 BM |
146 | /* This is the same as calling block_write_full_page, but it also |
147 | * writes pages outside of i_size | |
148 | */ | |
c548a1c1 AP |
149 | static int gfs2_write_full_page(struct page *page, get_block_t *get_block, |
150 | struct writeback_control *wbc) | |
fd4c5748 BM |
151 | { |
152 | struct inode * const inode = page->mapping->host; | |
153 | loff_t i_size = i_size_read(inode); | |
154 | const pgoff_t end_index = i_size >> PAGE_SHIFT; | |
155 | unsigned offset; | |
156 | ||
157 | /* | |
158 | * The page straddles i_size. It must be zeroed out on each and every | |
159 | * writepage invocation because it may be mmapped. "A file is mapped | |
160 | * in multiples of the page size. For a file that is not a multiple of | |
161 | * the page size, the remaining memory is zeroed when mapped, and | |
162 | * writes to that region are not written out to the file." | |
163 | */ | |
164 | offset = i_size & (PAGE_SIZE-1); | |
165 | if (page->index == end_index && offset) | |
166 | zero_user_segment(page, offset, PAGE_SIZE); | |
167 | ||
168 | return __block_write_full_page(inode, page, get_block, wbc, | |
169 | end_buffer_async_write); | |
170 | } | |
171 | ||
b8e7cbb6 SW |
172 | /** |
173 | * __gfs2_jdata_writepage - The core of jdata writepage | |
174 | * @page: The page to write | |
175 | * @wbc: The writeback control | |
176 | * | |
177 | * This is shared between writepage and writepages and implements the | |
178 | * core of the writepage operation. If a transaction is required then | |
179 | * PageChecked will have been set and the transaction will have | |
180 | * already been started before this is called. | |
181 | */ | |
182 | ||
183 | static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc) | |
184 | { | |
185 | struct inode *inode = page->mapping->host; | |
186 | struct gfs2_inode *ip = GFS2_I(inode); | |
187 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
188 | ||
189 | if (PageChecked(page)) { | |
190 | ClearPageChecked(page); | |
191 | if (!page_has_buffers(page)) { | |
192 | create_empty_buffers(page, inode->i_sb->s_blocksize, | |
47a9a527 | 193 | BIT(BH_Dirty)|BIT(BH_Uptodate)); |
b8e7cbb6 | 194 | } |
88b65ce5 | 195 | gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize); |
b8e7cbb6 | 196 | } |
fd4c5748 | 197 | return gfs2_write_full_page(page, gfs2_get_block_noalloc, wbc); |
b8e7cbb6 SW |
198 | } |
199 | ||
9ff8ec32 SW |
200 | /** |
201 | * gfs2_jdata_writepage - Write complete page | |
202 | * @page: Page to write | |
1272574b | 203 | * @wbc: The writeback control |
9ff8ec32 SW |
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; | |
fd4c5748 | 212 | struct gfs2_inode *ip = GFS2_I(inode); |
9ff8ec32 | 213 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
1bb7322f | 214 | int ret; |
9ff8ec32 | 215 | |
fd4c5748 BM |
216 | if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) |
217 | goto out; | |
218 | if (PageChecked(page) || current->journal_info) | |
219 | goto out_ignore; | |
220 | ret = __gfs2_jdata_writepage(page, wbc); | |
1bb7322f | 221 | return ret; |
18ec7d5c SW |
222 | |
223 | out_ignore: | |
224 | redirty_page_for_writepage(wbc, page); | |
fd4c5748 | 225 | out: |
18ec7d5c SW |
226 | unlock_page(page); |
227 | return 0; | |
b3b94faa DT |
228 | } |
229 | ||
a8d638e3 | 230 | /** |
45138990 | 231 | * gfs2_writepages - Write a bunch of dirty pages back to disk |
a8d638e3 SW |
232 | * @mapping: The mapping to write |
233 | * @wbc: Write-back control | |
234 | * | |
45138990 | 235 | * Used for both ordered and writeback modes. |
a8d638e3 | 236 | */ |
45138990 SW |
237 | static int gfs2_writepages(struct address_space *mapping, |
238 | struct writeback_control *wbc) | |
a8d638e3 | 239 | { |
b066a4ee AD |
240 | struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); |
241 | int ret = mpage_writepages(mapping, wbc, gfs2_get_block_noalloc); | |
242 | ||
243 | /* | |
244 | * Even if we didn't write any pages here, we might still be holding | |
245 | * dirty pages in the ail. We forcibly flush the ail because we don't | |
246 | * want balance_dirty_pages() to loop indefinitely trying to write out | |
247 | * pages held in the ail that it can't find. | |
248 | */ | |
249 | if (ret == 0) | |
250 | set_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags); | |
251 | ||
252 | return ret; | |
a8d638e3 SW |
253 | } |
254 | ||
b8e7cbb6 SW |
255 | /** |
256 | * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages | |
257 | * @mapping: The mapping | |
258 | * @wbc: The writeback control | |
b8e7cbb6 SW |
259 | * @pvec: The vector of pages |
260 | * @nr_pages: The number of pages to write | |
1272574b | 261 | * @done_index: Page index |
b8e7cbb6 SW |
262 | * |
263 | * Returns: non-zero if loop should terminate, zero otherwise | |
264 | */ | |
265 | ||
266 | static int gfs2_write_jdata_pagevec(struct address_space *mapping, | |
267 | struct writeback_control *wbc, | |
268 | struct pagevec *pvec, | |
9aa01593 | 269 | int nr_pages, |
774016b2 | 270 | pgoff_t *done_index) |
b8e7cbb6 SW |
271 | { |
272 | struct inode *inode = mapping->host; | |
273 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
09cbfeaf | 274 | unsigned nrblocks = nr_pages * (PAGE_SIZE/inode->i_sb->s_blocksize); |
b8e7cbb6 SW |
275 | int i; |
276 | int ret; | |
277 | ||
20b95bf2 | 278 | ret = gfs2_trans_begin(sdp, nrblocks, nrblocks); |
b8e7cbb6 SW |
279 | if (ret < 0) |
280 | return ret; | |
281 | ||
282 | for(i = 0; i < nr_pages; i++) { | |
283 | struct page *page = pvec->pages[i]; | |
284 | ||
774016b2 SW |
285 | *done_index = page->index; |
286 | ||
b8e7cbb6 SW |
287 | lock_page(page); |
288 | ||
289 | if (unlikely(page->mapping != mapping)) { | |
774016b2 | 290 | continue_unlock: |
b8e7cbb6 SW |
291 | unlock_page(page); |
292 | continue; | |
293 | } | |
294 | ||
774016b2 SW |
295 | if (!PageDirty(page)) { |
296 | /* someone wrote it for us */ | |
297 | goto continue_unlock; | |
b8e7cbb6 SW |
298 | } |
299 | ||
774016b2 SW |
300 | if (PageWriteback(page)) { |
301 | if (wbc->sync_mode != WB_SYNC_NONE) | |
302 | wait_on_page_writeback(page); | |
303 | else | |
304 | goto continue_unlock; | |
b8e7cbb6 SW |
305 | } |
306 | ||
774016b2 SW |
307 | BUG_ON(PageWriteback(page)); |
308 | if (!clear_page_dirty_for_io(page)) | |
309 | goto continue_unlock; | |
310 | ||
de1414a6 | 311 | trace_wbc_writepage(wbc, inode_to_bdi(inode)); |
b8e7cbb6 SW |
312 | |
313 | ret = __gfs2_jdata_writepage(page, wbc); | |
774016b2 SW |
314 | if (unlikely(ret)) { |
315 | if (ret == AOP_WRITEPAGE_ACTIVATE) { | |
316 | unlock_page(page); | |
317 | ret = 0; | |
318 | } else { | |
319 | ||
320 | /* | |
321 | * done_index is set past this page, | |
322 | * so media errors will not choke | |
323 | * background writeout for the entire | |
324 | * file. This has consequences for | |
325 | * range_cyclic semantics (ie. it may | |
326 | * not be suitable for data integrity | |
327 | * writeout). | |
328 | */ | |
329 | *done_index = page->index + 1; | |
330 | ret = 1; | |
331 | break; | |
332 | } | |
333 | } | |
b8e7cbb6 | 334 | |
774016b2 SW |
335 | /* |
336 | * We stop writing back only if we are not doing | |
337 | * integrity sync. In case of integrity sync we have to | |
338 | * keep going until we have written all the pages | |
339 | * we tagged for writeback prior to entering this loop. | |
340 | */ | |
341 | if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) { | |
b8e7cbb6 | 342 | ret = 1; |
774016b2 SW |
343 | break; |
344 | } | |
345 | ||
b8e7cbb6 SW |
346 | } |
347 | gfs2_trans_end(sdp); | |
348 | return ret; | |
349 | } | |
350 | ||
351 | /** | |
352 | * gfs2_write_cache_jdata - Like write_cache_pages but different | |
353 | * @mapping: The mapping to write | |
354 | * @wbc: The writeback control | |
b8e7cbb6 SW |
355 | * |
356 | * The reason that we use our own function here is that we need to | |
357 | * start transactions before we grab page locks. This allows us | |
358 | * to get the ordering right. | |
359 | */ | |
360 | ||
361 | static int gfs2_write_cache_jdata(struct address_space *mapping, | |
362 | struct writeback_control *wbc) | |
363 | { | |
b8e7cbb6 SW |
364 | int ret = 0; |
365 | int done = 0; | |
366 | struct pagevec pvec; | |
367 | int nr_pages; | |
774016b2 | 368 | pgoff_t uninitialized_var(writeback_index); |
b8e7cbb6 SW |
369 | pgoff_t index; |
370 | pgoff_t end; | |
774016b2 SW |
371 | pgoff_t done_index; |
372 | int cycled; | |
b8e7cbb6 | 373 | int range_whole = 0; |
774016b2 | 374 | int tag; |
b8e7cbb6 | 375 | |
86679820 | 376 | pagevec_init(&pvec); |
b8e7cbb6 | 377 | if (wbc->range_cyclic) { |
774016b2 SW |
378 | writeback_index = mapping->writeback_index; /* prev offset */ |
379 | index = writeback_index; | |
380 | if (index == 0) | |
381 | cycled = 1; | |
382 | else | |
383 | cycled = 0; | |
b8e7cbb6 SW |
384 | end = -1; |
385 | } else { | |
09cbfeaf KS |
386 | index = wbc->range_start >> PAGE_SHIFT; |
387 | end = wbc->range_end >> PAGE_SHIFT; | |
b8e7cbb6 SW |
388 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
389 | range_whole = 1; | |
774016b2 | 390 | cycled = 1; /* ignore range_cyclic tests */ |
b8e7cbb6 | 391 | } |
774016b2 SW |
392 | if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) |
393 | tag = PAGECACHE_TAG_TOWRITE; | |
394 | else | |
395 | tag = PAGECACHE_TAG_DIRTY; | |
b8e7cbb6 SW |
396 | |
397 | retry: | |
774016b2 SW |
398 | if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) |
399 | tag_pages_for_writeback(mapping, index, end); | |
400 | done_index = index; | |
401 | while (!done && (index <= end)) { | |
d2bc5b3c | 402 | nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end, |
67fd707f | 403 | tag); |
774016b2 SW |
404 | if (nr_pages == 0) |
405 | break; | |
406 | ||
9aa01593 | 407 | ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, &done_index); |
b8e7cbb6 SW |
408 | if (ret) |
409 | done = 1; | |
410 | if (ret > 0) | |
411 | ret = 0; | |
b8e7cbb6 SW |
412 | pagevec_release(&pvec); |
413 | cond_resched(); | |
414 | } | |
415 | ||
774016b2 | 416 | if (!cycled && !done) { |
b8e7cbb6 | 417 | /* |
774016b2 | 418 | * range_cyclic: |
b8e7cbb6 SW |
419 | * We hit the last page and there is more work to be done: wrap |
420 | * back to the start of the file | |
421 | */ | |
774016b2 | 422 | cycled = 1; |
b8e7cbb6 | 423 | index = 0; |
774016b2 | 424 | end = writeback_index - 1; |
b8e7cbb6 SW |
425 | goto retry; |
426 | } | |
427 | ||
428 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) | |
774016b2 SW |
429 | mapping->writeback_index = done_index; |
430 | ||
b8e7cbb6 SW |
431 | return ret; |
432 | } | |
433 | ||
434 | ||
435 | /** | |
436 | * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk | |
437 | * @mapping: The mapping to write | |
438 | * @wbc: The writeback control | |
439 | * | |
440 | */ | |
441 | ||
442 | static int gfs2_jdata_writepages(struct address_space *mapping, | |
443 | struct writeback_control *wbc) | |
444 | { | |
445 | struct gfs2_inode *ip = GFS2_I(mapping->host); | |
446 | struct gfs2_sbd *sdp = GFS2_SB(mapping->host); | |
447 | int ret; | |
448 | ||
449 | ret = gfs2_write_cache_jdata(mapping, wbc); | |
450 | if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) { | |
805c0907 BP |
451 | gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL | |
452 | GFS2_LFC_JDATA_WPAGES); | |
b8e7cbb6 SW |
453 | ret = gfs2_write_cache_jdata(mapping, wbc); |
454 | } | |
455 | return ret; | |
456 | } | |
457 | ||
b3b94faa DT |
458 | /** |
459 | * stuffed_readpage - Fill in a Linux page with stuffed file data | |
460 | * @ip: the inode | |
461 | * @page: the page | |
462 | * | |
463 | * Returns: errno | |
464 | */ | |
465 | ||
466 | static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) | |
467 | { | |
468 | struct buffer_head *dibh; | |
602c89d2 | 469 | u64 dsize = i_size_read(&ip->i_inode); |
b3b94faa DT |
470 | void *kaddr; |
471 | int error; | |
472 | ||
bf126aee | 473 | /* |
3c18ddd1 | 474 | * Due to the order of unstuffing files and ->fault(), we can be |
bf126aee SW |
475 | * asked for a zero page in the case of a stuffed file being extended, |
476 | * so we need to supply one here. It doesn't happen often. | |
477 | */ | |
478 | if (unlikely(page->index)) { | |
09cbfeaf | 479 | zero_user(page, 0, PAGE_SIZE); |
0a7ab79c | 480 | SetPageUptodate(page); |
bf126aee SW |
481 | return 0; |
482 | } | |
fd88de56 | 483 | |
b3b94faa DT |
484 | error = gfs2_meta_inode_buffer(ip, &dibh); |
485 | if (error) | |
486 | return error; | |
487 | ||
d9349285 | 488 | kaddr = kmap_atomic(page); |
235628c5 AG |
489 | if (dsize > gfs2_max_stuffed_size(ip)) |
490 | dsize = gfs2_max_stuffed_size(ip); | |
602c89d2 | 491 | memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize); |
09cbfeaf | 492 | memset(kaddr + dsize, 0, PAGE_SIZE - dsize); |
d9349285 | 493 | kunmap_atomic(kaddr); |
bf126aee | 494 | flush_dcache_page(page); |
b3b94faa | 495 | brelse(dibh); |
b3b94faa DT |
496 | SetPageUptodate(page); |
497 | ||
498 | return 0; | |
499 | } | |
500 | ||
b3b94faa | 501 | |
b3b94faa | 502 | /** |
51ff87bd SW |
503 | * __gfs2_readpage - readpage |
504 | * @file: The file to read a page for | |
b3b94faa DT |
505 | * @page: The page to read |
506 | * | |
9db115a0 AG |
507 | * This is the core of gfs2's readpage. It's used by the internal file |
508 | * reading code as in that case we already hold the glock. Also it's | |
51ff87bd | 509 | * called by gfs2_readpage() once the required lock has been granted. |
b3b94faa DT |
510 | */ |
511 | ||
51ff87bd | 512 | static int __gfs2_readpage(void *file, struct page *page) |
b3b94faa | 513 | { |
feaa7bba SW |
514 | struct gfs2_inode *ip = GFS2_I(page->mapping->host); |
515 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); | |
b3b94faa DT |
516 | int error; |
517 | ||
18ec7d5c | 518 | if (gfs2_is_stuffed(ip)) { |
fd88de56 SW |
519 | error = stuffed_readpage(ip, page); |
520 | unlock_page(page); | |
51ff87bd | 521 | } else { |
e9e1ef2b | 522 | error = mpage_readpage(page, gfs2_block_map); |
51ff87bd | 523 | } |
b3b94faa DT |
524 | |
525 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
51ff87bd | 526 | return -EIO; |
b3b94faa | 527 | |
51ff87bd SW |
528 | return error; |
529 | } | |
530 | ||
531 | /** | |
532 | * gfs2_readpage - read a page of a file | |
533 | * @file: The file to read | |
534 | * @page: The page of the file | |
535 | * | |
01b7c7ae SW |
536 | * This deals with the locking required. We have to unlock and |
537 | * relock the page in order to get the locking in the right | |
538 | * order. | |
51ff87bd SW |
539 | */ |
540 | ||
541 | static int gfs2_readpage(struct file *file, struct page *page) | |
542 | { | |
01b7c7ae SW |
543 | struct address_space *mapping = page->mapping; |
544 | struct gfs2_inode *ip = GFS2_I(mapping->host); | |
6802e340 | 545 | struct gfs2_holder gh; |
51ff87bd SW |
546 | int error; |
547 | ||
01b7c7ae | 548 | unlock_page(page); |
719ee344 SW |
549 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
550 | error = gfs2_glock_nq(&gh); | |
01b7c7ae | 551 | if (unlikely(error)) |
6802e340 | 552 | goto out; |
01b7c7ae SW |
553 | error = AOP_TRUNCATED_PAGE; |
554 | lock_page(page); | |
555 | if (page->mapping == mapping && !PageUptodate(page)) | |
556 | error = __gfs2_readpage(file, page); | |
557 | else | |
558 | unlock_page(page); | |
6802e340 | 559 | gfs2_glock_dq(&gh); |
18ec7d5c | 560 | out: |
6802e340 | 561 | gfs2_holder_uninit(&gh); |
01b7c7ae SW |
562 | if (error && error != AOP_TRUNCATED_PAGE) |
563 | lock_page(page); | |
51ff87bd SW |
564 | return error; |
565 | } | |
566 | ||
567 | /** | |
568 | * gfs2_internal_read - read an internal file | |
569 | * @ip: The gfs2 inode | |
51ff87bd SW |
570 | * @buf: The buffer to fill |
571 | * @pos: The file position | |
572 | * @size: The amount to read | |
573 | * | |
574 | */ | |
575 | ||
4306629e AP |
576 | int gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos, |
577 | unsigned size) | |
51ff87bd SW |
578 | { |
579 | struct address_space *mapping = ip->i_inode.i_mapping; | |
09cbfeaf KS |
580 | unsigned long index = *pos / PAGE_SIZE; |
581 | unsigned offset = *pos & (PAGE_SIZE - 1); | |
51ff87bd SW |
582 | unsigned copied = 0; |
583 | unsigned amt; | |
584 | struct page *page; | |
585 | void *p; | |
586 | ||
587 | do { | |
588 | amt = size - copied; | |
09cbfeaf KS |
589 | if (offset + size > PAGE_SIZE) |
590 | amt = PAGE_SIZE - offset; | |
51ff87bd SW |
591 | page = read_cache_page(mapping, index, __gfs2_readpage, NULL); |
592 | if (IS_ERR(page)) | |
593 | return PTR_ERR(page); | |
d9349285 | 594 | p = kmap_atomic(page); |
51ff87bd | 595 | memcpy(buf + copied, p + offset, amt); |
d9349285 | 596 | kunmap_atomic(p); |
09cbfeaf | 597 | put_page(page); |
51ff87bd SW |
598 | copied += amt; |
599 | index++; | |
600 | offset = 0; | |
601 | } while(copied < size); | |
602 | (*pos) += size; | |
603 | return size; | |
fd88de56 SW |
604 | } |
605 | ||
fd88de56 SW |
606 | /** |
607 | * gfs2_readpages - Read a bunch of pages at once | |
1272574b FF |
608 | * @file: The file to read from |
609 | * @mapping: Address space info | |
610 | * @pages: List of pages to read | |
611 | * @nr_pages: Number of pages to read | |
fd88de56 SW |
612 | * |
613 | * Some notes: | |
614 | * 1. This is only for readahead, so we can simply ignore any things | |
615 | * which are slightly inconvenient (such as locking conflicts between | |
616 | * the page lock and the glock) and return having done no I/O. Its | |
617 | * obviously not something we'd want to do on too regular a basis. | |
618 | * Any I/O we ignore at this time will be done via readpage later. | |
e1d5b18a | 619 | * 2. We don't handle stuffed files here we let readpage do the honours. |
fd88de56 | 620 | * 3. mpage_readpages() does most of the heavy lifting in the common case. |
e9e1ef2b | 621 | * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places. |
fd88de56 | 622 | */ |
3cc3f710 | 623 | |
fd88de56 SW |
624 | static int gfs2_readpages(struct file *file, struct address_space *mapping, |
625 | struct list_head *pages, unsigned nr_pages) | |
626 | { | |
627 | struct inode *inode = mapping->host; | |
feaa7bba SW |
628 | struct gfs2_inode *ip = GFS2_I(inode); |
629 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
fd88de56 | 630 | struct gfs2_holder gh; |
3cc3f710 | 631 | int ret; |
fd88de56 | 632 | |
719ee344 SW |
633 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
634 | ret = gfs2_glock_nq(&gh); | |
51ff87bd | 635 | if (unlikely(ret)) |
3cc3f710 | 636 | goto out_uninit; |
e1d5b18a | 637 | if (!gfs2_is_stuffed(ip)) |
e9e1ef2b | 638 | ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map); |
3cc3f710 SW |
639 | gfs2_glock_dq(&gh); |
640 | out_uninit: | |
641 | gfs2_holder_uninit(&gh); | |
fd88de56 SW |
642 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
643 | ret = -EIO; | |
644 | return ret; | |
b3b94faa DT |
645 | } |
646 | ||
647 | /** | |
7765ec26 | 648 | * gfs2_write_begin - Begin to write to a file |
b3b94faa | 649 | * @file: The file to write to |
7765ec26 SW |
650 | * @mapping: The mapping in which to write |
651 | * @pos: The file offset at which to start writing | |
652 | * @len: Length of the write | |
653 | * @flags: Various flags | |
654 | * @pagep: Pointer to return the page | |
655 | * @fsdata: Pointer to return fs data (unused by GFS2) | |
b3b94faa DT |
656 | * |
657 | * Returns: errno | |
658 | */ | |
659 | ||
7765ec26 SW |
660 | static int gfs2_write_begin(struct file *file, struct address_space *mapping, |
661 | loff_t pos, unsigned len, unsigned flags, | |
662 | struct page **pagep, void **fsdata) | |
b3b94faa | 663 | { |
7765ec26 SW |
664 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
665 | struct gfs2_sbd *sdp = GFS2_SB(mapping->host); | |
1946f70a | 666 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
7ed122e4 | 667 | unsigned int data_blocks = 0, ind_blocks = 0, rblocks; |
71f890f7 | 668 | unsigned requested = 0; |
18ec7d5c | 669 | int alloc_required; |
b3b94faa | 670 | int error = 0; |
09cbfeaf KS |
671 | pgoff_t index = pos >> PAGE_SHIFT; |
672 | unsigned from = pos & (PAGE_SIZE - 1); | |
7765ec26 | 673 | struct page *page; |
52ae7b79 | 674 | |
719ee344 SW |
675 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh); |
676 | error = gfs2_glock_nq(&ip->i_gh); | |
7765ec26 | 677 | if (unlikely(error)) |
18ec7d5c | 678 | goto out_uninit; |
1946f70a BM |
679 | if (&ip->i_inode == sdp->sd_rindex) { |
680 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, | |
681 | GL_NOCACHE, &m_ip->i_gh); | |
682 | if (unlikely(error)) { | |
683 | gfs2_glock_dq(&ip->i_gh); | |
684 | goto out_uninit; | |
685 | } | |
686 | } | |
b3b94faa | 687 | |
461cb419 | 688 | alloc_required = gfs2_write_alloc_required(ip, pos, len); |
18ec7d5c | 689 | |
7ed122e4 SW |
690 | if (alloc_required || gfs2_is_jdata(ip)) |
691 | gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks); | |
692 | ||
18ec7d5c | 693 | if (alloc_required) { |
7b9cff46 | 694 | struct gfs2_alloc_parms ap = { .aflags = 0, }; |
b8fbf471 AD |
695 | requested = data_blocks + ind_blocks; |
696 | ap.target = requested; | |
697 | error = gfs2_quota_lock_check(ip, &ap); | |
18ec7d5c | 698 | if (error) |
5407e242 | 699 | goto out_unlock; |
18ec7d5c | 700 | |
7b9cff46 | 701 | error = gfs2_inplace_reserve(ip, &ap); |
18ec7d5c SW |
702 | if (error) |
703 | goto out_qunlock; | |
704 | } | |
705 | ||
706 | rblocks = RES_DINODE + ind_blocks; | |
707 | if (gfs2_is_jdata(ip)) | |
708 | rblocks += data_blocks ? data_blocks : 1; | |
709 | if (ind_blocks || data_blocks) | |
710 | rblocks += RES_STATFS + RES_QUOTA; | |
1946f70a BM |
711 | if (&ip->i_inode == sdp->sd_rindex) |
712 | rblocks += 2 * RES_STATFS; | |
bf97b673 | 713 | if (alloc_required) |
71f890f7 | 714 | rblocks += gfs2_rg_blocks(ip, requested); |
18ec7d5c | 715 | |
16615be1 | 716 | error = gfs2_trans_begin(sdp, rblocks, |
09cbfeaf | 717 | PAGE_SIZE/sdp->sd_sb.sb_bsize); |
18ec7d5c | 718 | if (error) |
a867bb28 | 719 | goto out_trans_fail; |
18ec7d5c | 720 | |
c41d4f09 | 721 | error = -ENOMEM; |
e4fefbac | 722 | flags |= AOP_FLAG_NOFS; |
54566b2c | 723 | page = grab_cache_page_write_begin(mapping, index, flags); |
c41d4f09 SW |
724 | *pagep = page; |
725 | if (unlikely(!page)) | |
726 | goto out_endtrans; | |
727 | ||
18ec7d5c | 728 | if (gfs2_is_stuffed(ip)) { |
c41d4f09 | 729 | error = 0; |
235628c5 | 730 | if (pos + len > gfs2_max_stuffed_size(ip)) { |
f25ef0c1 | 731 | error = gfs2_unstuff_dinode(ip, page); |
5c4e9e03 SW |
732 | if (error == 0) |
733 | goto prepare_write; | |
c41d4f09 | 734 | } else if (!PageUptodate(page)) { |
b3b94faa | 735 | error = stuffed_readpage(ip, page); |
c41d4f09 | 736 | } |
5c4e9e03 | 737 | goto out; |
18ec7d5c SW |
738 | } |
739 | ||
5c4e9e03 | 740 | prepare_write: |
ebdec241 | 741 | error = __block_write_begin(page, from, len, gfs2_block_map); |
18ec7d5c | 742 | out: |
c41d4f09 SW |
743 | if (error == 0) |
744 | return 0; | |
745 | ||
6c474f7b | 746 | unlock_page(page); |
09cbfeaf | 747 | put_page(page); |
15c6fd97 | 748 | |
ff8f33c8 | 749 | gfs2_trans_end(sdp); |
c41d4f09 | 750 | if (pos + len > ip->i_inode.i_size) |
ff8f33c8 SW |
751 | gfs2_trim_blocks(&ip->i_inode); |
752 | goto out_trans_fail; | |
753 | ||
c41d4f09 SW |
754 | out_endtrans: |
755 | gfs2_trans_end(sdp); | |
a867bb28 | 756 | out_trans_fail: |
c41d4f09 SW |
757 | if (alloc_required) { |
758 | gfs2_inplace_release(ip); | |
18ec7d5c | 759 | out_qunlock: |
c41d4f09 | 760 | gfs2_quota_unlock(ip); |
c41d4f09 | 761 | } |
18ec7d5c | 762 | out_unlock: |
1946f70a BM |
763 | if (&ip->i_inode == sdp->sd_rindex) { |
764 | gfs2_glock_dq(&m_ip->i_gh); | |
765 | gfs2_holder_uninit(&m_ip->i_gh); | |
766 | } | |
c41d4f09 | 767 | gfs2_glock_dq(&ip->i_gh); |
18ec7d5c | 768 | out_uninit: |
c41d4f09 | 769 | gfs2_holder_uninit(&ip->i_gh); |
b3b94faa DT |
770 | return error; |
771 | } | |
772 | ||
7ae8fa84 RP |
773 | /** |
774 | * adjust_fs_space - Adjusts the free space available due to gfs2_grow | |
775 | * @inode: the rindex inode | |
776 | */ | |
777 | static void adjust_fs_space(struct inode *inode) | |
778 | { | |
779 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; | |
1946f70a BM |
780 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
781 | struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); | |
7ae8fa84 RP |
782 | struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; |
783 | struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; | |
1946f70a | 784 | struct buffer_head *m_bh, *l_bh; |
7ae8fa84 RP |
785 | u64 fs_total, new_free; |
786 | ||
787 | /* Total up the file system space, according to the latest rindex. */ | |
788 | fs_total = gfs2_ri_total(sdp); | |
1946f70a BM |
789 | if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0) |
790 | return; | |
7ae8fa84 RP |
791 | |
792 | spin_lock(&sdp->sd_statfs_spin); | |
1946f70a BM |
793 | gfs2_statfs_change_in(m_sc, m_bh->b_data + |
794 | sizeof(struct gfs2_dinode)); | |
7ae8fa84 RP |
795 | if (fs_total > (m_sc->sc_total + l_sc->sc_total)) |
796 | new_free = fs_total - (m_sc->sc_total + l_sc->sc_total); | |
797 | else | |
798 | new_free = 0; | |
799 | spin_unlock(&sdp->sd_statfs_spin); | |
6c53267f RP |
800 | fs_warn(sdp, "File system extended by %llu blocks.\n", |
801 | (unsigned long long)new_free); | |
7ae8fa84 | 802 | gfs2_statfs_change(sdp, new_free, new_free, 0); |
1946f70a BM |
803 | |
804 | if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0) | |
805 | goto out; | |
806 | update_statfs(sdp, m_bh, l_bh); | |
807 | brelse(l_bh); | |
808 | out: | |
809 | brelse(m_bh); | |
7ae8fa84 RP |
810 | } |
811 | ||
b3b94faa | 812 | /** |
7765ec26 SW |
813 | * gfs2_stuffed_write_end - Write end for stuffed files |
814 | * @inode: The inode | |
815 | * @dibh: The buffer_head containing the on-disk inode | |
816 | * @pos: The file position | |
817 | * @len: The length of the write | |
818 | * @copied: How much was actually copied by the VFS | |
819 | * @page: The page | |
820 | * | |
821 | * This copies the data from the page into the inode block after | |
822 | * the inode data structure itself. | |
823 | * | |
824 | * Returns: errno | |
825 | */ | |
826 | static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh, | |
827 | loff_t pos, unsigned len, unsigned copied, | |
828 | struct page *page) | |
829 | { | |
830 | struct gfs2_inode *ip = GFS2_I(inode); | |
831 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
1946f70a | 832 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
7765ec26 SW |
833 | u64 to = pos + copied; |
834 | void *kaddr; | |
835 | unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode); | |
7765ec26 | 836 | |
235628c5 AG |
837 | BUG_ON(pos + len > gfs2_max_stuffed_size(ip)); |
838 | ||
d9349285 | 839 | kaddr = kmap_atomic(page); |
7765ec26 | 840 | memcpy(buf + pos, kaddr + pos, copied); |
7765ec26 | 841 | flush_dcache_page(page); |
d9349285 | 842 | kunmap_atomic(kaddr); |
7765ec26 | 843 | |
43388b21 | 844 | WARN_ON(!PageUptodate(page)); |
7765ec26 | 845 | unlock_page(page); |
09cbfeaf | 846 | put_page(page); |
7765ec26 | 847 | |
7537d81a | 848 | if (copied) { |
a2e0f799 | 849 | if (inode->i_size < to) |
7537d81a | 850 | i_size_write(inode, to); |
7765ec26 SW |
851 | mark_inode_dirty(inode); |
852 | } | |
853 | ||
9ae3c6de | 854 | if (inode == sdp->sd_rindex) { |
7765ec26 | 855 | adjust_fs_space(inode); |
ca9248d8 | 856 | sdp->sd_rindex_uptodate = 0; |
9ae3c6de | 857 | } |
7765ec26 SW |
858 | |
859 | brelse(dibh); | |
860 | gfs2_trans_end(sdp); | |
1946f70a BM |
861 | if (inode == sdp->sd_rindex) { |
862 | gfs2_glock_dq(&m_ip->i_gh); | |
863 | gfs2_holder_uninit(&m_ip->i_gh); | |
864 | } | |
7765ec26 SW |
865 | gfs2_glock_dq(&ip->i_gh); |
866 | gfs2_holder_uninit(&ip->i_gh); | |
867 | return copied; | |
868 | } | |
869 | ||
870 | /** | |
871 | * gfs2_write_end | |
b3b94faa | 872 | * @file: The file to write to |
7765ec26 SW |
873 | * @mapping: The address space to write to |
874 | * @pos: The file position | |
875 | * @len: The length of the data | |
1272574b | 876 | * @copied: How much was actually copied by the VFS |
7765ec26 SW |
877 | * @page: The page that has been written |
878 | * @fsdata: The fsdata (unused in GFS2) | |
879 | * | |
880 | * The main write_end function for GFS2. We have a separate one for | |
881 | * stuffed files as they are slightly different, otherwise we just | |
882 | * put our locking around the VFS provided functions. | |
b3b94faa DT |
883 | * |
884 | * Returns: errno | |
885 | */ | |
886 | ||
7765ec26 SW |
887 | static int gfs2_write_end(struct file *file, struct address_space *mapping, |
888 | loff_t pos, unsigned len, unsigned copied, | |
889 | struct page *page, void *fsdata) | |
b3b94faa DT |
890 | { |
891 | struct inode *inode = page->mapping->host; | |
feaa7bba SW |
892 | struct gfs2_inode *ip = GFS2_I(inode); |
893 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
1946f70a | 894 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
18ec7d5c | 895 | struct buffer_head *dibh; |
7765ec26 | 896 | int ret; |
0c901809 BM |
897 | struct gfs2_trans *tr = current->journal_info; |
898 | BUG_ON(!tr); | |
b3b94faa | 899 | |
7afd88d9 | 900 | BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL); |
18ec7d5c | 901 | |
7765ec26 SW |
902 | ret = gfs2_meta_inode_buffer(ip, &dibh); |
903 | if (unlikely(ret)) { | |
904 | unlock_page(page); | |
09cbfeaf | 905 | put_page(page); |
7765ec26 SW |
906 | goto failed; |
907 | } | |
18ec7d5c | 908 | |
7765ec26 SW |
909 | if (gfs2_is_stuffed(ip)) |
910 | return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page); | |
b3b94faa | 911 | |
bf36a713 | 912 | if (!gfs2_is_writeback(ip)) |
88b65ce5 | 913 | gfs2_page_add_databufs(ip, page, pos & ~PAGE_MASK, len); |
b3b94faa | 914 | |
7765ec26 | 915 | ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); |
0c901809 BM |
916 | if (tr->tr_num_buf_new) |
917 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); | |
918 | else | |
919 | gfs2_trans_add_meta(ip->i_gl, dibh); | |
920 | ||
48516ced | 921 | |
9ae3c6de | 922 | if (inode == sdp->sd_rindex) { |
7ae8fa84 | 923 | adjust_fs_space(inode); |
ca9248d8 | 924 | sdp->sd_rindex_uptodate = 0; |
9ae3c6de | 925 | } |
7ae8fa84 | 926 | |
18ec7d5c | 927 | brelse(dibh); |
7765ec26 | 928 | failed: |
deab72d3 | 929 | gfs2_trans_end(sdp); |
71f890f7 | 930 | gfs2_inplace_release(ip); |
b54e9a0b | 931 | if (ip->i_qadata && ip->i_qadata->qa_qd_num) |
18ec7d5c | 932 | gfs2_quota_unlock(ip); |
1946f70a BM |
933 | if (inode == sdp->sd_rindex) { |
934 | gfs2_glock_dq(&m_ip->i_gh); | |
935 | gfs2_holder_uninit(&m_ip->i_gh); | |
936 | } | |
7765ec26 | 937 | gfs2_glock_dq(&ip->i_gh); |
18ec7d5c | 938 | gfs2_holder_uninit(&ip->i_gh); |
7765ec26 | 939 | return ret; |
b3b94faa DT |
940 | } |
941 | ||
8fb68595 RP |
942 | /** |
943 | * gfs2_set_page_dirty - Page dirtying function | |
944 | * @page: The page to dirty | |
945 | * | |
946 | * Returns: 1 if it dirtyed the page, or 0 otherwise | |
947 | */ | |
948 | ||
949 | static int gfs2_set_page_dirty(struct page *page) | |
950 | { | |
5561093e | 951 | SetPageChecked(page); |
8fb68595 RP |
952 | return __set_page_dirty_buffers(page); |
953 | } | |
954 | ||
b3b94faa DT |
955 | /** |
956 | * gfs2_bmap - Block map function | |
957 | * @mapping: Address space info | |
958 | * @lblock: The block to map | |
959 | * | |
960 | * Returns: The disk address for the block or 0 on hole or error | |
961 | */ | |
962 | ||
963 | static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) | |
964 | { | |
feaa7bba | 965 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
b3b94faa DT |
966 | struct gfs2_holder i_gh; |
967 | sector_t dblock = 0; | |
968 | int error; | |
969 | ||
b3b94faa DT |
970 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
971 | if (error) | |
972 | return 0; | |
973 | ||
974 | if (!gfs2_is_stuffed(ip)) | |
e9e1ef2b | 975 | dblock = generic_block_bmap(mapping, lblock, gfs2_block_map); |
b3b94faa DT |
976 | |
977 | gfs2_glock_dq_uninit(&i_gh); | |
978 | ||
979 | return dblock; | |
980 | } | |
981 | ||
d7b616e2 SW |
982 | static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh) |
983 | { | |
984 | struct gfs2_bufdata *bd; | |
985 | ||
986 | lock_buffer(bh); | |
987 | gfs2_log_lock(sdp); | |
988 | clear_buffer_dirty(bh); | |
989 | bd = bh->b_private; | |
990 | if (bd) { | |
c0752aa7 BP |
991 | if (!list_empty(&bd->bd_list) && !buffer_pinned(bh)) |
992 | list_del_init(&bd->bd_list); | |
16615be1 | 993 | else |
68cd4ce2 | 994 | gfs2_remove_from_journal(bh, REMOVE_JDATA); |
d7b616e2 SW |
995 | } |
996 | bh->b_bdev = NULL; | |
997 | clear_buffer_mapped(bh); | |
998 | clear_buffer_req(bh); | |
999 | clear_buffer_new(bh); | |
1000 | gfs2_log_unlock(sdp); | |
1001 | unlock_buffer(bh); | |
1002 | } | |
1003 | ||
d47992f8 LC |
1004 | static void gfs2_invalidatepage(struct page *page, unsigned int offset, |
1005 | unsigned int length) | |
b3b94faa | 1006 | { |
d7b616e2 | 1007 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); |
5c0bb97c | 1008 | unsigned int stop = offset + length; |
09cbfeaf | 1009 | int partial_page = (offset || length < PAGE_SIZE); |
d7b616e2 SW |
1010 | struct buffer_head *bh, *head; |
1011 | unsigned long pos = 0; | |
1012 | ||
b3b94faa | 1013 | BUG_ON(!PageLocked(page)); |
5c0bb97c | 1014 | if (!partial_page) |
8fb68595 | 1015 | ClearPageChecked(page); |
d7b616e2 SW |
1016 | if (!page_has_buffers(page)) |
1017 | goto out; | |
b3b94faa | 1018 | |
d7b616e2 SW |
1019 | bh = head = page_buffers(page); |
1020 | do { | |
5c0bb97c LC |
1021 | if (pos + bh->b_size > stop) |
1022 | return; | |
1023 | ||
d7b616e2 SW |
1024 | if (offset <= pos) |
1025 | gfs2_discard(sdp, bh); | |
1026 | pos += bh->b_size; | |
1027 | bh = bh->b_this_page; | |
1028 | } while (bh != head); | |
1029 | out: | |
5c0bb97c | 1030 | if (!partial_page) |
d7b616e2 | 1031 | try_to_release_page(page, 0); |
b3b94faa DT |
1032 | } |
1033 | ||
c7b33834 SW |
1034 | /** |
1035 | * gfs2_ok_for_dio - check that dio is valid on this file | |
1036 | * @ip: The inode | |
c7b33834 SW |
1037 | * @offset: The offset at which we are reading or writing |
1038 | * | |
1039 | * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o) | |
1040 | * 1 (to accept the i/o request) | |
1041 | */ | |
6f673763 | 1042 | static int gfs2_ok_for_dio(struct gfs2_inode *ip, loff_t offset) |
c7b33834 SW |
1043 | { |
1044 | /* | |
1045 | * Should we return an error here? I can't see that O_DIRECT for | |
5561093e SW |
1046 | * a stuffed file makes any sense. For now we'll silently fall |
1047 | * back to buffered I/O | |
c7b33834 | 1048 | */ |
c7b33834 SW |
1049 | if (gfs2_is_stuffed(ip)) |
1050 | return 0; | |
1051 | ||
acb57a36 | 1052 | if (offset >= i_size_read(&ip->i_inode)) |
c7b33834 SW |
1053 | return 0; |
1054 | return 1; | |
1055 | } | |
1056 | ||
1057 | ||
1058 | ||
c8b8e32d | 1059 | static ssize_t gfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter) |
d1665e41 SW |
1060 | { |
1061 | struct file *file = iocb->ki_filp; | |
1062 | struct inode *inode = file->f_mapping->host; | |
dfd11184 | 1063 | struct address_space *mapping = inode->i_mapping; |
feaa7bba | 1064 | struct gfs2_inode *ip = GFS2_I(inode); |
c8b8e32d | 1065 | loff_t offset = iocb->ki_pos; |
d1665e41 SW |
1066 | struct gfs2_holder gh; |
1067 | int rv; | |
1068 | ||
1069 | /* | |
c7b33834 SW |
1070 | * Deferred lock, even if its a write, since we do no allocation |
1071 | * on this path. All we need change is atime, and this lock mode | |
1072 | * ensures that other nodes have flushed their buffered read caches | |
1073 | * (i.e. their page cache entries for this inode). We do not, | |
1074 | * unfortunately have the option of only flushing a range like | |
1075 | * the VFS does. | |
d1665e41 | 1076 | */ |
719ee344 SW |
1077 | gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh); |
1078 | rv = gfs2_glock_nq(&gh); | |
d1665e41 | 1079 | if (rv) |
9c7fe835 | 1080 | goto out_uninit; |
6f673763 | 1081 | rv = gfs2_ok_for_dio(ip, offset); |
c7b33834 SW |
1082 | if (rv != 1) |
1083 | goto out; /* dio not valid, fall back to buffered i/o */ | |
1084 | ||
dfd11184 SW |
1085 | /* |
1086 | * Now since we are holding a deferred (CW) lock at this point, you | |
1087 | * might be wondering why this is ever needed. There is a case however | |
1088 | * where we've granted a deferred local lock against a cached exclusive | |
1089 | * glock. That is ok provided all granted local locks are deferred, but | |
1090 | * it also means that it is possible to encounter pages which are | |
1091 | * cached and possibly also mapped. So here we check for that and sort | |
1092 | * them out ahead of the dio. The glock state machine will take care of | |
1093 | * everything else. | |
1094 | * | |
1095 | * If in fact the cached glock state (gl->gl_state) is deferred (CW) in | |
1096 | * the first place, mapping->nr_pages will always be zero. | |
1097 | */ | |
1098 | if (mapping->nrpages) { | |
09cbfeaf | 1099 | loff_t lstart = offset & ~(PAGE_SIZE - 1); |
a6cbcd4a | 1100 | loff_t len = iov_iter_count(iter); |
dfd11184 SW |
1101 | loff_t end = PAGE_ALIGN(offset + len) - 1; |
1102 | ||
1103 | rv = 0; | |
1104 | if (len == 0) | |
1105 | goto out; | |
1106 | if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags)) | |
1107 | unmap_shared_mapping_range(ip->i_inode.i_mapping, offset, len); | |
1108 | rv = filemap_write_and_wait_range(mapping, lstart, end); | |
1109 | if (rv) | |
086352f1 | 1110 | goto out; |
6f673763 | 1111 | if (iov_iter_rw(iter) == WRITE) |
086352f1 | 1112 | truncate_inode_pages_range(mapping, lstart, end); |
dfd11184 SW |
1113 | } |
1114 | ||
17f8c842 | 1115 | rv = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter, |
c8b8e32d | 1116 | gfs2_get_block_direct, NULL, NULL, 0); |
d1665e41 | 1117 | out: |
8e711e10 | 1118 | gfs2_glock_dq(&gh); |
9c7fe835 | 1119 | out_uninit: |
d1665e41 | 1120 | gfs2_holder_uninit(&gh); |
d1665e41 SW |
1121 | return rv; |
1122 | } | |
1123 | ||
4340fe62 | 1124 | /** |
623d9355 | 1125 | * gfs2_releasepage - free the metadata associated with a page |
4340fe62 SW |
1126 | * @page: the page that's being released |
1127 | * @gfp_mask: passed from Linux VFS, ignored by us | |
1128 | * | |
1129 | * Call try_to_free_buffers() if the buffers in this page can be | |
1130 | * released. | |
1131 | * | |
1132 | * Returns: 0 | |
1133 | */ | |
1134 | ||
1135 | int gfs2_releasepage(struct page *page, gfp_t gfp_mask) | |
1136 | { | |
009d8518 SW |
1137 | struct address_space *mapping = page->mapping; |
1138 | struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); | |
4340fe62 SW |
1139 | struct buffer_head *bh, *head; |
1140 | struct gfs2_bufdata *bd; | |
4340fe62 SW |
1141 | |
1142 | if (!page_has_buffers(page)) | |
891ba6d4 | 1143 | return 0; |
4340fe62 | 1144 | |
1c185c02 AG |
1145 | /* |
1146 | * From xfs_vm_releasepage: mm accommodates an old ext3 case where | |
1147 | * clean pages might not have had the dirty bit cleared. Thus, it can | |
1148 | * send actual dirty pages to ->releasepage() via shrink_active_list(). | |
1149 | * | |
1150 | * As a workaround, we skip pages that contain dirty buffers below. | |
1151 | * Once ->releasepage isn't called on dirty pages anymore, we can warn | |
1152 | * on dirty buffers like we used to here again. | |
1153 | */ | |
1154 | ||
bb3b0e3d | 1155 | gfs2_log_lock(sdp); |
380f7c65 | 1156 | spin_lock(&sdp->sd_ail_lock); |
4340fe62 SW |
1157 | head = bh = page_buffers(page); |
1158 | do { | |
bb3b0e3d SW |
1159 | if (atomic_read(&bh->b_count)) |
1160 | goto cannot_release; | |
1161 | bd = bh->b_private; | |
16ca9412 | 1162 | if (bd && bd->bd_tr) |
bb3b0e3d | 1163 | goto cannot_release; |
1c185c02 AG |
1164 | if (buffer_dirty(bh) || WARN_ON(buffer_pinned(bh))) |
1165 | goto cannot_release; | |
bb3b0e3d SW |
1166 | bh = bh->b_this_page; |
1167 | } while(bh != head); | |
380f7c65 | 1168 | spin_unlock(&sdp->sd_ail_lock); |
4340fe62 | 1169 | |
bb3b0e3d SW |
1170 | head = bh = page_buffers(page); |
1171 | do { | |
4340fe62 SW |
1172 | bd = bh->b_private; |
1173 | if (bd) { | |
1174 | gfs2_assert_warn(sdp, bd->bd_bh == bh); | |
e4f29206 SW |
1175 | if (!list_empty(&bd->bd_list)) |
1176 | list_del_init(&bd->bd_list); | |
1177 | bd->bd_bh = NULL; | |
4340fe62 | 1178 | bh->b_private = NULL; |
623d9355 | 1179 | kmem_cache_free(gfs2_bufdata_cachep, bd); |
e4f29206 | 1180 | } |
4340fe62 SW |
1181 | |
1182 | bh = bh->b_this_page; | |
166afccd | 1183 | } while (bh != head); |
e4f29206 | 1184 | gfs2_log_unlock(sdp); |
4340fe62 | 1185 | |
4340fe62 | 1186 | return try_to_free_buffers(page); |
8f065d36 | 1187 | |
bb3b0e3d | 1188 | cannot_release: |
380f7c65 | 1189 | spin_unlock(&sdp->sd_ail_lock); |
bb3b0e3d SW |
1190 | gfs2_log_unlock(sdp); |
1191 | return 0; | |
4340fe62 SW |
1192 | } |
1193 | ||
5561093e | 1194 | static const struct address_space_operations gfs2_writeback_aops = { |
9d358143 | 1195 | .writepage = gfs2_writepage, |
45138990 | 1196 | .writepages = gfs2_writepages, |
5561093e SW |
1197 | .readpage = gfs2_readpage, |
1198 | .readpages = gfs2_readpages, | |
5561093e SW |
1199 | .write_begin = gfs2_write_begin, |
1200 | .write_end = gfs2_write_end, | |
1201 | .bmap = gfs2_bmap, | |
1202 | .invalidatepage = gfs2_invalidatepage, | |
1203 | .releasepage = gfs2_releasepage, | |
1204 | .direct_IO = gfs2_direct_IO, | |
e5d9dc27 | 1205 | .migratepage = buffer_migrate_page, |
229615de | 1206 | .is_partially_uptodate = block_is_partially_uptodate, |
aa261f54 | 1207 | .error_remove_page = generic_error_remove_page, |
5561093e SW |
1208 | }; |
1209 | ||
1210 | static const struct address_space_operations gfs2_ordered_aops = { | |
9d358143 | 1211 | .writepage = gfs2_writepage, |
45138990 | 1212 | .writepages = gfs2_writepages, |
b3b94faa | 1213 | .readpage = gfs2_readpage, |
fd88de56 | 1214 | .readpages = gfs2_readpages, |
7765ec26 SW |
1215 | .write_begin = gfs2_write_begin, |
1216 | .write_end = gfs2_write_end, | |
8fb68595 | 1217 | .set_page_dirty = gfs2_set_page_dirty, |
b3b94faa DT |
1218 | .bmap = gfs2_bmap, |
1219 | .invalidatepage = gfs2_invalidatepage, | |
4340fe62 | 1220 | .releasepage = gfs2_releasepage, |
b3b94faa | 1221 | .direct_IO = gfs2_direct_IO, |
e5d9dc27 | 1222 | .migratepage = buffer_migrate_page, |
229615de | 1223 | .is_partially_uptodate = block_is_partially_uptodate, |
aa261f54 | 1224 | .error_remove_page = generic_error_remove_page, |
b3b94faa DT |
1225 | }; |
1226 | ||
5561093e | 1227 | static const struct address_space_operations gfs2_jdata_aops = { |
9ff8ec32 | 1228 | .writepage = gfs2_jdata_writepage, |
b8e7cbb6 | 1229 | .writepages = gfs2_jdata_writepages, |
5561093e SW |
1230 | .readpage = gfs2_readpage, |
1231 | .readpages = gfs2_readpages, | |
5561093e SW |
1232 | .write_begin = gfs2_write_begin, |
1233 | .write_end = gfs2_write_end, | |
1234 | .set_page_dirty = gfs2_set_page_dirty, | |
1235 | .bmap = gfs2_bmap, | |
1236 | .invalidatepage = gfs2_invalidatepage, | |
1237 | .releasepage = gfs2_releasepage, | |
229615de | 1238 | .is_partially_uptodate = block_is_partially_uptodate, |
aa261f54 | 1239 | .error_remove_page = generic_error_remove_page, |
5561093e SW |
1240 | }; |
1241 | ||
1242 | void gfs2_set_aops(struct inode *inode) | |
1243 | { | |
1244 | struct gfs2_inode *ip = GFS2_I(inode); | |
1245 | ||
1246 | if (gfs2_is_writeback(ip)) | |
1247 | inode->i_mapping->a_ops = &gfs2_writeback_aops; | |
1248 | else if (gfs2_is_ordered(ip)) | |
1249 | inode->i_mapping->a_ops = &gfs2_ordered_aops; | |
1250 | else if (gfs2_is_jdata(ip)) | |
1251 | inode->i_mapping->a_ops = &gfs2_jdata_aops; | |
1252 | else | |
1253 | BUG(); | |
1254 | } | |
1255 |