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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. | |
3a8a9a10 | 3 | * Copyright (C) 2004-2006 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> |
5c676f6d | 19 | #include <linux/gfs2_ondisk.h> |
7d308590 | 20 | #include <linux/lm_interface.h> |
b3b94faa DT |
21 | |
22 | #include "gfs2.h" | |
5c676f6d | 23 | #include "incore.h" |
b3b94faa DT |
24 | #include "bmap.h" |
25 | #include "glock.h" | |
26 | #include "inode.h" | |
b3b94faa DT |
27 | #include "log.h" |
28 | #include "meta_io.h" | |
29 | #include "ops_address.h" | |
b3b94faa DT |
30 | #include "quota.h" |
31 | #include "trans.h" | |
18ec7d5c | 32 | #include "rgrp.h" |
61a30dcb | 33 | #include "ops_file.h" |
5c676f6d | 34 | #include "util.h" |
4340fe62 | 35 | #include "glops.h" |
b3b94faa | 36 | |
ba7f7290 SW |
37 | |
38 | static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page, | |
39 | unsigned int from, unsigned int to) | |
40 | { | |
41 | struct buffer_head *head = page_buffers(page); | |
42 | unsigned int bsize = head->b_size; | |
43 | struct buffer_head *bh; | |
44 | unsigned int start, end; | |
45 | ||
46 | for (bh = head, start = 0; bh != head || !start; | |
47 | bh = bh->b_this_page, start = end) { | |
48 | end = start + bsize; | |
49 | if (end <= from || start >= to) | |
50 | continue; | |
51 | gfs2_trans_add_bh(ip->i_gl, bh, 0); | |
52 | } | |
53 | } | |
54 | ||
b3b94faa | 55 | /** |
4ff14670 | 56 | * gfs2_get_block - Fills in a buffer head with details about a block |
b3b94faa DT |
57 | * @inode: The inode |
58 | * @lblock: The block number to look up | |
59 | * @bh_result: The buffer head to return the result in | |
60 | * @create: Non-zero if we may add block to the file | |
61 | * | |
62 | * Returns: errno | |
63 | */ | |
64 | ||
4ff14670 SW |
65 | int gfs2_get_block(struct inode *inode, sector_t lblock, |
66 | struct buffer_head *bh_result, int create) | |
b3b94faa | 67 | { |
23591256 | 68 | return gfs2_block_map(inode, lblock, create, bh_result); |
b3b94faa DT |
69 | } |
70 | ||
71 | /** | |
7a6bbacb | 72 | * gfs2_get_block_noalloc - Fills in a buffer head with details about a block |
b3b94faa DT |
73 | * @inode: The inode |
74 | * @lblock: The block number to look up | |
75 | * @bh_result: The buffer head to return the result in | |
76 | * @create: Non-zero if we may add block to the file | |
77 | * | |
78 | * Returns: errno | |
79 | */ | |
80 | ||
7a6bbacb SW |
81 | static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock, |
82 | struct buffer_head *bh_result, int create) | |
b3b94faa | 83 | { |
b3b94faa DT |
84 | int error; |
85 | ||
23591256 | 86 | error = gfs2_block_map(inode, lblock, 0, bh_result); |
b3b94faa DT |
87 | if (error) |
88 | return error; | |
7a6bbacb SW |
89 | if (bh_result->b_blocknr == 0) |
90 | return -EIO; | |
91 | return 0; | |
b3b94faa DT |
92 | } |
93 | ||
7a6bbacb SW |
94 | static int gfs2_get_block_direct(struct inode *inode, sector_t lblock, |
95 | struct buffer_head *bh_result, int create) | |
623d9355 | 96 | { |
23591256 | 97 | return gfs2_block_map(inode, lblock, 0, bh_result); |
623d9355 | 98 | } |
7a6bbacb | 99 | |
b3b94faa DT |
100 | /** |
101 | * gfs2_writepage - Write complete page | |
102 | * @page: Page to write | |
103 | * | |
104 | * Returns: errno | |
105 | * | |
18ec7d5c SW |
106 | * Some of this is copied from block_write_full_page() although we still |
107 | * call it to do most of the work. | |
b3b94faa DT |
108 | */ |
109 | ||
110 | static int gfs2_writepage(struct page *page, struct writeback_control *wbc) | |
111 | { | |
18ec7d5c | 112 | struct inode *inode = page->mapping->host; |
f4387149 SW |
113 | struct gfs2_inode *ip = GFS2_I(inode); |
114 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
18ec7d5c SW |
115 | loff_t i_size = i_size_read(inode); |
116 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
117 | unsigned offset; | |
b3b94faa | 118 | int error; |
18ec7d5c | 119 | int done_trans = 0; |
b3b94faa | 120 | |
b3b94faa DT |
121 | if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) { |
122 | unlock_page(page); | |
123 | return -EIO; | |
124 | } | |
5c676f6d | 125 | if (current->journal_info) |
18ec7d5c SW |
126 | goto out_ignore; |
127 | ||
128 | /* Is the page fully outside i_size? (truncate in progress) */ | |
129 | offset = i_size & (PAGE_CACHE_SIZE-1); | |
d2d7b8a2 | 130 | if (page->index > end_index || (page->index == end_index && !offset)) { |
18ec7d5c | 131 | page->mapping->a_ops->invalidatepage(page, 0); |
b3b94faa | 132 | unlock_page(page); |
18ec7d5c | 133 | return 0; /* don't care */ |
b3b94faa DT |
134 | } |
135 | ||
18ec7d5c SW |
136 | if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip)) { |
137 | error = gfs2_trans_begin(sdp, RES_DINODE + 1, 0); | |
138 | if (error) | |
139 | goto out_ignore; | |
f4387149 SW |
140 | if (!page_has_buffers(page)) { |
141 | create_empty_buffers(page, inode->i_sb->s_blocksize, | |
142 | (1 << BH_Dirty)|(1 << BH_Uptodate)); | |
143 | } | |
18ec7d5c SW |
144 | gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1); |
145 | done_trans = 1; | |
146 | } | |
7a6bbacb | 147 | error = block_write_full_page(page, gfs2_get_block_noalloc, wbc); |
18ec7d5c SW |
148 | if (done_trans) |
149 | gfs2_trans_end(sdp); | |
b3b94faa | 150 | gfs2_meta_cache_flush(ip); |
b3b94faa | 151 | return error; |
18ec7d5c SW |
152 | |
153 | out_ignore: | |
154 | redirty_page_for_writepage(wbc, page); | |
155 | unlock_page(page); | |
156 | return 0; | |
b3b94faa DT |
157 | } |
158 | ||
159 | /** | |
160 | * stuffed_readpage - Fill in a Linux page with stuffed file data | |
161 | * @ip: the inode | |
162 | * @page: the page | |
163 | * | |
164 | * Returns: errno | |
165 | */ | |
166 | ||
167 | static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) | |
168 | { | |
169 | struct buffer_head *dibh; | |
170 | void *kaddr; | |
171 | int error; | |
172 | ||
61057c6b | 173 | BUG_ON(page->index); |
fd88de56 | 174 | |
b3b94faa DT |
175 | error = gfs2_meta_inode_buffer(ip, &dibh); |
176 | if (error) | |
177 | return error; | |
178 | ||
5c4e9e03 | 179 | kaddr = kmap_atomic(page, KM_USER0); |
fd88de56 | 180 | memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), |
b3b94faa | 181 | ip->i_di.di_size); |
fd88de56 | 182 | memset(kaddr + ip->i_di.di_size, 0, PAGE_CACHE_SIZE - ip->i_di.di_size); |
c312c4fd | 183 | kunmap_atomic(kaddr, KM_USER0); |
b3b94faa DT |
184 | |
185 | brelse(dibh); | |
186 | ||
187 | SetPageUptodate(page); | |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
b3b94faa | 192 | |
b3b94faa DT |
193 | /** |
194 | * gfs2_readpage - readpage with locking | |
18ec7d5c SW |
195 | * @file: The file to read a page for. N.B. This may be NULL if we are |
196 | * reading an internal file. | |
b3b94faa DT |
197 | * @page: The page to read |
198 | * | |
199 | * Returns: errno | |
200 | */ | |
201 | ||
202 | static int gfs2_readpage(struct file *file, struct page *page) | |
203 | { | |
feaa7bba SW |
204 | struct gfs2_inode *ip = GFS2_I(page->mapping->host); |
205 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); | |
dc41aeed | 206 | struct gfs2_file *gf = NULL; |
18ec7d5c | 207 | struct gfs2_holder gh; |
b3b94faa | 208 | int error; |
59a1cc6b | 209 | int do_unlock = 0; |
b3b94faa | 210 | |
dd538c83 | 211 | if (likely(file != &gfs2_internal_file_sentinel)) { |
59a1cc6b | 212 | if (file) { |
dc41aeed | 213 | gf = file->private_data; |
59a1cc6b | 214 | if (test_bit(GFF_EXLOCK, &gf->f_flags)) |
dc41aeed | 215 | /* gfs2_sharewrite_nopage has grabbed the ip->i_gl already */ |
59a1cc6b SW |
216 | goto skip_lock; |
217 | } | |
2ca99501 | 218 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME|LM_FLAG_TRY_1CB, &gh); |
59a1cc6b | 219 | do_unlock = 1; |
dcd24799 | 220 | error = gfs2_glock_nq_atime(&gh); |
fd88de56 | 221 | if (unlikely(error)) |
61a30dcb SW |
222 | goto out_unlock; |
223 | } | |
b3b94faa | 224 | |
59a1cc6b | 225 | skip_lock: |
18ec7d5c | 226 | if (gfs2_is_stuffed(ip)) { |
fd88de56 SW |
227 | error = stuffed_readpage(ip, page); |
228 | unlock_page(page); | |
b3b94faa | 229 | } else |
18ec7d5c | 230 | error = mpage_readpage(page, gfs2_get_block); |
b3b94faa DT |
231 | |
232 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
233 | error = -EIO; | |
234 | ||
07903c02 | 235 | if (do_unlock) { |
61a30dcb SW |
236 | gfs2_glock_dq_m(1, &gh); |
237 | gfs2_holder_uninit(&gh); | |
238 | } | |
18ec7d5c | 239 | out: |
b3b94faa | 240 | return error; |
18ec7d5c | 241 | out_unlock: |
2ca99501 SW |
242 | if (error == GLR_TRYFAILED) |
243 | error = AOP_TRUNCATED_PAGE; | |
18ec7d5c | 244 | unlock_page(page); |
59a1cc6b | 245 | if (do_unlock) |
fd88de56 SW |
246 | gfs2_holder_uninit(&gh); |
247 | goto out; | |
248 | } | |
249 | ||
fd88de56 SW |
250 | /** |
251 | * gfs2_readpages - Read a bunch of pages at once | |
252 | * | |
253 | * Some notes: | |
254 | * 1. This is only for readahead, so we can simply ignore any things | |
255 | * which are slightly inconvenient (such as locking conflicts between | |
256 | * the page lock and the glock) and return having done no I/O. Its | |
257 | * obviously not something we'd want to do on too regular a basis. | |
258 | * Any I/O we ignore at this time will be done via readpage later. | |
259 | * 2. We have to handle stuffed files here too. | |
260 | * 3. mpage_readpages() does most of the heavy lifting in the common case. | |
261 | * 4. gfs2_get_block() is relied upon to set BH_Boundary in the right places. | |
262 | * 5. We use LM_FLAG_TRY_1CB here, effectively we then have lock-ahead as | |
263 | * well as read-ahead. | |
264 | */ | |
265 | static int gfs2_readpages(struct file *file, struct address_space *mapping, | |
266 | struct list_head *pages, unsigned nr_pages) | |
267 | { | |
268 | struct inode *inode = mapping->host; | |
feaa7bba SW |
269 | struct gfs2_inode *ip = GFS2_I(inode); |
270 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
fd88de56 SW |
271 | struct gfs2_holder gh; |
272 | unsigned page_idx; | |
273 | int ret; | |
59a1cc6b | 274 | int do_unlock = 0; |
fd88de56 | 275 | |
dd538c83 | 276 | if (likely(file != &gfs2_internal_file_sentinel)) { |
59a1cc6b SW |
277 | if (file) { |
278 | struct gfs2_file *gf = file->private_data; | |
279 | if (test_bit(GFF_EXLOCK, &gf->f_flags)) | |
280 | goto skip_lock; | |
281 | } | |
fd88de56 | 282 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, |
2ca99501 | 283 | LM_FLAG_TRY_1CB|GL_ATIME, &gh); |
59a1cc6b | 284 | do_unlock = 1; |
dcd24799 | 285 | ret = gfs2_glock_nq_atime(&gh); |
907b9bce | 286 | if (ret == GLR_TRYFAILED) |
fd88de56 SW |
287 | goto out_noerror; |
288 | if (unlikely(ret)) | |
289 | goto out_unlock; | |
290 | } | |
59a1cc6b | 291 | skip_lock: |
fd88de56 SW |
292 | if (gfs2_is_stuffed(ip)) { |
293 | struct pagevec lru_pvec; | |
294 | pagevec_init(&lru_pvec, 0); | |
295 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { | |
ffeb874b SW |
296 | struct page *page = list_entry(pages->prev, struct page, lru); |
297 | prefetchw(&page->flags); | |
fd88de56 SW |
298 | list_del(&page->lru); |
299 | if (!add_to_page_cache(page, mapping, | |
300 | page->index, GFP_KERNEL)) { | |
301 | ret = stuffed_readpage(ip, page); | |
302 | unlock_page(page); | |
303 | if (!pagevec_add(&lru_pvec, page)) | |
304 | __pagevec_lru_add(&lru_pvec); | |
ffeb874b SW |
305 | } else { |
306 | page_cache_release(page); | |
fd88de56 | 307 | } |
fd88de56 SW |
308 | } |
309 | pagevec_lru_add(&lru_pvec); | |
310 | ret = 0; | |
311 | } else { | |
312 | /* What we really want to do .... */ | |
313 | ret = mpage_readpages(mapping, pages, nr_pages, gfs2_get_block); | |
314 | } | |
315 | ||
59a1cc6b | 316 | if (do_unlock) { |
fd88de56 SW |
317 | gfs2_glock_dq_m(1, &gh); |
318 | gfs2_holder_uninit(&gh); | |
319 | } | |
320 | out: | |
321 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
322 | ret = -EIO; | |
323 | return ret; | |
324 | out_noerror: | |
325 | ret = 0; | |
326 | out_unlock: | |
59a1cc6b | 327 | if (do_unlock) |
fd88de56 | 328 | gfs2_holder_uninit(&gh); |
18ec7d5c | 329 | goto out; |
b3b94faa DT |
330 | } |
331 | ||
332 | /** | |
333 | * gfs2_prepare_write - Prepare to write a page to a file | |
334 | * @file: The file to write to | |
335 | * @page: The page which is to be prepared for writing | |
336 | * @from: From (byte range within page) | |
337 | * @to: To (byte range within page) | |
338 | * | |
339 | * Returns: errno | |
340 | */ | |
341 | ||
342 | static int gfs2_prepare_write(struct file *file, struct page *page, | |
343 | unsigned from, unsigned to) | |
344 | { | |
feaa7bba SW |
345 | struct gfs2_inode *ip = GFS2_I(page->mapping->host); |
346 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); | |
18ec7d5c SW |
347 | unsigned int data_blocks, ind_blocks, rblocks; |
348 | int alloc_required; | |
b3b94faa | 349 | int error = 0; |
18ec7d5c SW |
350 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + from; |
351 | loff_t end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
352 | struct gfs2_alloc *al; | |
52ae7b79 RC |
353 | unsigned int write_len = to - from; |
354 | ||
b3b94faa | 355 | |
2ca99501 | 356 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME|LM_FLAG_TRY_1CB, &ip->i_gh); |
dcd24799 | 357 | error = gfs2_glock_nq_atime(&ip->i_gh); |
2ca99501 SW |
358 | if (unlikely(error)) { |
359 | if (error == GLR_TRYFAILED) | |
360 | error = AOP_TRUNCATED_PAGE; | |
18ec7d5c | 361 | goto out_uninit; |
2ca99501 | 362 | } |
b3b94faa | 363 | |
52ae7b79 | 364 | gfs2_write_calc_reserv(ip, write_len, &data_blocks, &ind_blocks); |
18ec7d5c | 365 | |
52ae7b79 | 366 | error = gfs2_write_alloc_required(ip, pos, write_len, &alloc_required); |
18ec7d5c SW |
367 | if (error) |
368 | goto out_unlock; | |
b3b94faa | 369 | |
18ec7d5c | 370 | |
f5c54804 | 371 | ip->i_alloc.al_requested = 0; |
18ec7d5c SW |
372 | if (alloc_required) { |
373 | al = gfs2_alloc_get(ip); | |
374 | ||
375 | error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
376 | if (error) | |
377 | goto out_alloc_put; | |
378 | ||
2933f925 | 379 | error = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid); |
18ec7d5c SW |
380 | if (error) |
381 | goto out_qunlock; | |
382 | ||
383 | al->al_requested = data_blocks + ind_blocks; | |
384 | error = gfs2_inplace_reserve(ip); | |
385 | if (error) | |
386 | goto out_qunlock; | |
387 | } | |
388 | ||
389 | rblocks = RES_DINODE + ind_blocks; | |
390 | if (gfs2_is_jdata(ip)) | |
391 | rblocks += data_blocks ? data_blocks : 1; | |
392 | if (ind_blocks || data_blocks) | |
393 | rblocks += RES_STATFS + RES_QUOTA; | |
394 | ||
395 | error = gfs2_trans_begin(sdp, rblocks, 0); | |
396 | if (error) | |
397 | goto out; | |
398 | ||
399 | if (gfs2_is_stuffed(ip)) { | |
400 | if (end > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { | |
f25ef0c1 | 401 | error = gfs2_unstuff_dinode(ip, page); |
5c4e9e03 SW |
402 | if (error == 0) |
403 | goto prepare_write; | |
404 | } else if (!PageUptodate(page)) | |
b3b94faa | 405 | error = stuffed_readpage(ip, page); |
5c4e9e03 | 406 | goto out; |
18ec7d5c SW |
407 | } |
408 | ||
5c4e9e03 | 409 | prepare_write: |
18ec7d5c SW |
410 | error = block_prepare_write(page, from, to, gfs2_get_block); |
411 | ||
412 | out: | |
413 | if (error) { | |
414 | gfs2_trans_end(sdp); | |
415 | if (alloc_required) { | |
416 | gfs2_inplace_release(ip); | |
417 | out_qunlock: | |
418 | gfs2_quota_unlock(ip); | |
419 | out_alloc_put: | |
420 | gfs2_alloc_put(ip); | |
421 | } | |
422 | out_unlock: | |
423 | gfs2_glock_dq_m(1, &ip->i_gh); | |
424 | out_uninit: | |
425 | gfs2_holder_uninit(&ip->i_gh); | |
426 | } | |
b3b94faa DT |
427 | |
428 | return error; | |
429 | } | |
430 | ||
431 | /** | |
432 | * gfs2_commit_write - Commit write to a file | |
433 | * @file: The file to write to | |
434 | * @page: The page containing the data | |
435 | * @from: From (byte range within page) | |
436 | * @to: To (byte range within page) | |
437 | * | |
438 | * Returns: errno | |
439 | */ | |
440 | ||
441 | static int gfs2_commit_write(struct file *file, struct page *page, | |
442 | unsigned from, unsigned to) | |
443 | { | |
444 | struct inode *inode = page->mapping->host; | |
feaa7bba SW |
445 | struct gfs2_inode *ip = GFS2_I(inode); |
446 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
18ec7d5c SW |
447 | int error = -EOPNOTSUPP; |
448 | struct buffer_head *dibh; | |
48516ced SW |
449 | struct gfs2_alloc *al = &ip->i_alloc; |
450 | struct gfs2_dinode *di; | |
b3b94faa | 451 | |
18ec7d5c SW |
452 | if (gfs2_assert_withdraw(sdp, gfs2_glock_is_locked_by_me(ip->i_gl))) |
453 | goto fail_nounlock; | |
454 | ||
455 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
456 | if (error) | |
457 | goto fail_endtrans; | |
458 | ||
459 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); | |
48516ced | 460 | di = (struct gfs2_dinode *)dibh->b_data; |
18ec7d5c | 461 | |
b3b94faa | 462 | if (gfs2_is_stuffed(ip)) { |
cd915493 | 463 | u64 file_size; |
b3b94faa DT |
464 | void *kaddr; |
465 | ||
cd915493 | 466 | file_size = ((u64)page->index << PAGE_CACHE_SHIFT) + to; |
b3b94faa | 467 | |
18ec7d5c | 468 | kaddr = kmap_atomic(page, KM_USER0); |
b3b94faa | 469 | memcpy(dibh->b_data + sizeof(struct gfs2_dinode) + from, |
0bd5996a | 470 | kaddr + from, to - from); |
c312c4fd | 471 | kunmap_atomic(kaddr, KM_USER0); |
b3b94faa DT |
472 | |
473 | SetPageUptodate(page); | |
474 | ||
ae619320 | 475 | if (inode->i_size < file_size) { |
b3b94faa | 476 | i_size_write(inode, file_size); |
ae619320 SW |
477 | mark_inode_dirty(inode); |
478 | } | |
b3b94faa | 479 | } else { |
568f4c96 SW |
480 | if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || |
481 | gfs2_is_jdata(ip)) | |
257f9b4e | 482 | gfs2_page_add_databufs(ip, page, from, to); |
b3b94faa DT |
483 | error = generic_commit_write(file, page, from, to); |
484 | if (error) | |
485 | goto fail; | |
486 | } | |
487 | ||
48516ced | 488 | if (ip->i_di.di_size < inode->i_size) { |
18ec7d5c | 489 | ip->i_di.di_size = inode->i_size; |
48516ced SW |
490 | di->di_size = cpu_to_be64(inode->i_size); |
491 | } | |
492 | ||
18ec7d5c SW |
493 | brelse(dibh); |
494 | gfs2_trans_end(sdp); | |
495 | if (al->al_requested) { | |
496 | gfs2_inplace_release(ip); | |
497 | gfs2_quota_unlock(ip); | |
498 | gfs2_alloc_put(ip); | |
499 | } | |
500 | gfs2_glock_dq_m(1, &ip->i_gh); | |
501 | gfs2_holder_uninit(&ip->i_gh); | |
b3b94faa DT |
502 | return 0; |
503 | ||
18ec7d5c SW |
504 | fail: |
505 | brelse(dibh); | |
506 | fail_endtrans: | |
507 | gfs2_trans_end(sdp); | |
508 | if (al->al_requested) { | |
509 | gfs2_inplace_release(ip); | |
510 | gfs2_quota_unlock(ip); | |
511 | gfs2_alloc_put(ip); | |
512 | } | |
513 | gfs2_glock_dq_m(1, &ip->i_gh); | |
514 | gfs2_holder_uninit(&ip->i_gh); | |
515 | fail_nounlock: | |
b3b94faa | 516 | ClearPageUptodate(page); |
b3b94faa DT |
517 | return error; |
518 | } | |
519 | ||
520 | /** | |
521 | * gfs2_bmap - Block map function | |
522 | * @mapping: Address space info | |
523 | * @lblock: The block to map | |
524 | * | |
525 | * Returns: The disk address for the block or 0 on hole or error | |
526 | */ | |
527 | ||
528 | static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) | |
529 | { | |
feaa7bba | 530 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
b3b94faa DT |
531 | struct gfs2_holder i_gh; |
532 | sector_t dblock = 0; | |
533 | int error; | |
534 | ||
b3b94faa DT |
535 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
536 | if (error) | |
537 | return 0; | |
538 | ||
539 | if (!gfs2_is_stuffed(ip)) | |
4ff14670 | 540 | dblock = generic_block_bmap(mapping, lblock, gfs2_get_block); |
b3b94faa DT |
541 | |
542 | gfs2_glock_dq_uninit(&i_gh); | |
543 | ||
544 | return dblock; | |
545 | } | |
546 | ||
547 | static void discard_buffer(struct gfs2_sbd *sdp, struct buffer_head *bh) | |
548 | { | |
64fb4eb7 | 549 | struct gfs2_bufdata *bd; |
b3b94faa DT |
550 | |
551 | gfs2_log_lock(sdp); | |
5c676f6d | 552 | bd = bh->b_private; |
64fb4eb7 SW |
553 | if (bd) { |
554 | bd->bd_bh = NULL; | |
5c676f6d | 555 | bh->b_private = NULL; |
15d00c0b SW |
556 | } |
557 | gfs2_log_unlock(sdp); | |
b3b94faa DT |
558 | |
559 | lock_buffer(bh); | |
560 | clear_buffer_dirty(bh); | |
561 | bh->b_bdev = NULL; | |
562 | clear_buffer_mapped(bh); | |
563 | clear_buffer_req(bh); | |
564 | clear_buffer_new(bh); | |
565 | clear_buffer_delay(bh); | |
566 | unlock_buffer(bh); | |
567 | } | |
568 | ||
8628de05 | 569 | static void gfs2_invalidatepage(struct page *page, unsigned long offset) |
b3b94faa | 570 | { |
15d00c0b | 571 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); |
b3b94faa DT |
572 | struct buffer_head *head, *bh, *next; |
573 | unsigned int curr_off = 0; | |
b3b94faa DT |
574 | |
575 | BUG_ON(!PageLocked(page)); | |
576 | if (!page_has_buffers(page)) | |
8628de05 | 577 | return; |
b3b94faa DT |
578 | |
579 | bh = head = page_buffers(page); | |
580 | do { | |
581 | unsigned int next_off = curr_off + bh->b_size; | |
582 | next = bh->b_this_page; | |
583 | ||
584 | if (offset <= curr_off) | |
585 | discard_buffer(sdp, bh); | |
586 | ||
587 | curr_off = next_off; | |
588 | bh = next; | |
589 | } while (bh != head); | |
590 | ||
591 | if (!offset) | |
8628de05 | 592 | try_to_release_page(page, 0); |
b3b94faa | 593 | |
8628de05 | 594 | return; |
b3b94faa DT |
595 | } |
596 | ||
c7b33834 SW |
597 | /** |
598 | * gfs2_ok_for_dio - check that dio is valid on this file | |
599 | * @ip: The inode | |
600 | * @rw: READ or WRITE | |
601 | * @offset: The offset at which we are reading or writing | |
602 | * | |
603 | * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o) | |
604 | * 1 (to accept the i/o request) | |
605 | */ | |
606 | static int gfs2_ok_for_dio(struct gfs2_inode *ip, int rw, loff_t offset) | |
607 | { | |
608 | /* | |
609 | * Should we return an error here? I can't see that O_DIRECT for | |
610 | * a journaled file makes any sense. For now we'll silently fall | |
611 | * back to buffered I/O, likewise we do the same for stuffed | |
612 | * files since they are (a) small and (b) unaligned. | |
613 | */ | |
614 | if (gfs2_is_jdata(ip)) | |
615 | return 0; | |
616 | ||
617 | if (gfs2_is_stuffed(ip)) | |
618 | return 0; | |
619 | ||
620 | if (offset > i_size_read(&ip->i_inode)) | |
621 | return 0; | |
622 | return 1; | |
623 | } | |
624 | ||
625 | ||
626 | ||
a9e5f4d0 SW |
627 | static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb, |
628 | const struct iovec *iov, loff_t offset, | |
629 | unsigned long nr_segs) | |
d1665e41 SW |
630 | { |
631 | struct file *file = iocb->ki_filp; | |
632 | struct inode *inode = file->f_mapping->host; | |
feaa7bba | 633 | struct gfs2_inode *ip = GFS2_I(inode); |
d1665e41 SW |
634 | struct gfs2_holder gh; |
635 | int rv; | |
636 | ||
637 | /* | |
c7b33834 SW |
638 | * Deferred lock, even if its a write, since we do no allocation |
639 | * on this path. All we need change is atime, and this lock mode | |
640 | * ensures that other nodes have flushed their buffered read caches | |
641 | * (i.e. their page cache entries for this inode). We do not, | |
642 | * unfortunately have the option of only flushing a range like | |
643 | * the VFS does. | |
d1665e41 | 644 | */ |
c7b33834 | 645 | gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, GL_ATIME, &gh); |
dcd24799 | 646 | rv = gfs2_glock_nq_atime(&gh); |
d1665e41 | 647 | if (rv) |
c7b33834 SW |
648 | return rv; |
649 | rv = gfs2_ok_for_dio(ip, rw, offset); | |
650 | if (rv != 1) | |
651 | goto out; /* dio not valid, fall back to buffered i/o */ | |
652 | ||
653 | rv = blockdev_direct_IO_no_locking(rw, iocb, inode, inode->i_sb->s_bdev, | |
654 | iov, offset, nr_segs, | |
655 | gfs2_get_block_direct, NULL); | |
d1665e41 SW |
656 | out: |
657 | gfs2_glock_dq_m(1, &gh); | |
658 | gfs2_holder_uninit(&gh); | |
d1665e41 SW |
659 | return rv; |
660 | } | |
661 | ||
4340fe62 SW |
662 | /** |
663 | * stuck_releasepage - We're stuck in gfs2_releasepage(). Print stuff out. | |
664 | * @bh: the buffer we're stuck on | |
665 | * | |
666 | */ | |
667 | ||
668 | static void stuck_releasepage(struct buffer_head *bh) | |
669 | { | |
670 | struct inode *inode = bh->b_page->mapping->host; | |
671 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; | |
672 | struct gfs2_bufdata *bd = bh->b_private; | |
673 | struct gfs2_glock *gl; | |
166afccd SW |
674 | static unsigned limit = 0; |
675 | ||
0bd5996a | 676 | if (limit > 3) |
166afccd | 677 | return; |
0bd5996a | 678 | limit++; |
4340fe62 SW |
679 | |
680 | fs_warn(sdp, "stuck in gfs2_releasepage() %p\n", inode); | |
681 | fs_warn(sdp, "blkno = %llu, bh->b_count = %d\n", | |
682 | (unsigned long long)bh->b_blocknr, atomic_read(&bh->b_count)); | |
683 | fs_warn(sdp, "pinned = %u\n", buffer_pinned(bh)); | |
684 | fs_warn(sdp, "bh->b_private = %s\n", (bd) ? "!NULL" : "NULL"); | |
685 | ||
686 | if (!bd) | |
687 | return; | |
688 | ||
689 | gl = bd->bd_gl; | |
690 | ||
907b9bce | 691 | fs_warn(sdp, "gl = (%u, %llu)\n", |
4340fe62 SW |
692 | gl->gl_name.ln_type, (unsigned long long)gl->gl_name.ln_number); |
693 | ||
694 | fs_warn(sdp, "bd_list_tr = %s, bd_le.le_list = %s\n", | |
695 | (list_empty(&bd->bd_list_tr)) ? "no" : "yes", | |
696 | (list_empty(&bd->bd_le.le_list)) ? "no" : "yes"); | |
697 | ||
698 | if (gl->gl_ops == &gfs2_inode_glops) { | |
699 | struct gfs2_inode *ip = gl->gl_object; | |
700 | unsigned int x; | |
701 | ||
702 | if (!ip) | |
703 | return; | |
704 | ||
705 | fs_warn(sdp, "ip = %llu %llu\n", | |
706 | (unsigned long long)ip->i_num.no_formal_ino, | |
707 | (unsigned long long)ip->i_num.no_addr); | |
708 | ||
709 | for (x = 0; x < GFS2_MAX_META_HEIGHT; x++) | |
710 | fs_warn(sdp, "ip->i_cache[%u] = %s\n", | |
711 | x, (ip->i_cache[x]) ? "!NULL" : "NULL"); | |
712 | } | |
713 | } | |
714 | ||
715 | /** | |
623d9355 | 716 | * gfs2_releasepage - free the metadata associated with a page |
4340fe62 SW |
717 | * @page: the page that's being released |
718 | * @gfp_mask: passed from Linux VFS, ignored by us | |
719 | * | |
720 | * Call try_to_free_buffers() if the buffers in this page can be | |
721 | * released. | |
722 | * | |
723 | * Returns: 0 | |
724 | */ | |
725 | ||
726 | int gfs2_releasepage(struct page *page, gfp_t gfp_mask) | |
727 | { | |
728 | struct inode *aspace = page->mapping->host; | |
729 | struct gfs2_sbd *sdp = aspace->i_sb->s_fs_info; | |
730 | struct buffer_head *bh, *head; | |
731 | struct gfs2_bufdata *bd; | |
166afccd | 732 | unsigned long t = jiffies + gfs2_tune_get(sdp, gt_stall_secs) * HZ; |
4340fe62 SW |
733 | |
734 | if (!page_has_buffers(page)) | |
735 | goto out; | |
736 | ||
737 | head = bh = page_buffers(page); | |
738 | do { | |
4340fe62 | 739 | while (atomic_read(&bh->b_count)) { |
166afccd SW |
740 | if (!atomic_read(&aspace->i_writecount)) |
741 | return 0; | |
742 | ||
61057c6b RC |
743 | if (!(gfp_mask & __GFP_WAIT)) |
744 | return 0; | |
745 | ||
166afccd SW |
746 | if (time_after_eq(jiffies, t)) { |
747 | stuck_releasepage(bh); | |
748 | /* should we withdraw here? */ | |
749 | return 0; | |
4340fe62 SW |
750 | } |
751 | ||
166afccd | 752 | yield(); |
4340fe62 SW |
753 | } |
754 | ||
755 | gfs2_assert_warn(sdp, !buffer_pinned(bh)); | |
623d9355 | 756 | gfs2_assert_warn(sdp, !buffer_dirty(bh)); |
4340fe62 | 757 | |
623d9355 | 758 | gfs2_log_lock(sdp); |
4340fe62 SW |
759 | bd = bh->b_private; |
760 | if (bd) { | |
761 | gfs2_assert_warn(sdp, bd->bd_bh == bh); | |
762 | gfs2_assert_warn(sdp, list_empty(&bd->bd_list_tr)); | |
4340fe62 | 763 | gfs2_assert_warn(sdp, !bd->bd_ail); |
623d9355 SW |
764 | bd->bd_bh = NULL; |
765 | if (!list_empty(&bd->bd_le.le_list)) | |
766 | bd = NULL; | |
4340fe62 SW |
767 | bh->b_private = NULL; |
768 | } | |
623d9355 SW |
769 | gfs2_log_unlock(sdp); |
770 | if (bd) | |
771 | kmem_cache_free(gfs2_bufdata_cachep, bd); | |
4340fe62 SW |
772 | |
773 | bh = bh->b_this_page; | |
166afccd | 774 | } while (bh != head); |
4340fe62 | 775 | |
a9e5f4d0 | 776 | out: |
4340fe62 SW |
777 | return try_to_free_buffers(page); |
778 | } | |
779 | ||
66de045d | 780 | const struct address_space_operations gfs2_file_aops = { |
b3b94faa DT |
781 | .writepage = gfs2_writepage, |
782 | .readpage = gfs2_readpage, | |
fd88de56 | 783 | .readpages = gfs2_readpages, |
b3b94faa DT |
784 | .sync_page = block_sync_page, |
785 | .prepare_write = gfs2_prepare_write, | |
786 | .commit_write = gfs2_commit_write, | |
787 | .bmap = gfs2_bmap, | |
788 | .invalidatepage = gfs2_invalidatepage, | |
4340fe62 | 789 | .releasepage = gfs2_releasepage, |
b3b94faa DT |
790 | .direct_IO = gfs2_direct_IO, |
791 | }; | |
792 |