]>
Commit | Line | Data |
---|---|---|
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 | |
7 | * of the GNU General Public License v.2. | |
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> |
b3b94faa DT |
20 | |
21 | #include "gfs2.h" | |
5c676f6d SW |
22 | #include "lm_interface.h" |
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 | { |
b3b94faa DT |
68 | int new = create; |
69 | uint64_t dblock; | |
70 | int error; | |
fd88de56 | 71 | int boundary; |
b3b94faa | 72 | |
fd88de56 | 73 | error = gfs2_block_map(inode, lblock, &new, &dblock, &boundary); |
b3b94faa DT |
74 | if (error) |
75 | return error; | |
76 | ||
77 | if (!dblock) | |
78 | return 0; | |
79 | ||
80 | map_bh(bh_result, inode->i_sb, dblock); | |
81 | if (new) | |
82 | set_buffer_new(bh_result); | |
fd88de56 SW |
83 | if (boundary) |
84 | set_buffer_boundary(bh_result); | |
b3b94faa DT |
85 | |
86 | return 0; | |
87 | } | |
88 | ||
89 | /** | |
90 | * get_block_noalloc - Fills in a buffer head with details about a block | |
91 | * @inode: The inode | |
92 | * @lblock: The block number to look up | |
93 | * @bh_result: The buffer head to return the result in | |
94 | * @create: Non-zero if we may add block to the file | |
95 | * | |
96 | * Returns: errno | |
97 | */ | |
98 | ||
99 | static int get_block_noalloc(struct inode *inode, sector_t lblock, | |
100 | struct buffer_head *bh_result, int create) | |
101 | { | |
b3b94faa DT |
102 | int new = 0; |
103 | uint64_t dblock; | |
104 | int error; | |
fd88de56 | 105 | int boundary; |
b3b94faa | 106 | |
fd88de56 | 107 | error = gfs2_block_map(inode, lblock, &new, &dblock, &boundary); |
b3b94faa DT |
108 | if (error) |
109 | return error; | |
110 | ||
111 | if (dblock) | |
112 | map_bh(bh_result, inode->i_sb, dblock); | |
feaa7bba | 113 | else if (gfs2_assert_withdraw(GFS2_SB(inode), !create)) |
b3b94faa | 114 | error = -EIO; |
fd88de56 SW |
115 | if (boundary) |
116 | set_buffer_boundary(bh_result); | |
b3b94faa DT |
117 | |
118 | return error; | |
119 | } | |
120 | ||
b3b94faa DT |
121 | /** |
122 | * gfs2_writepage - Write complete page | |
123 | * @page: Page to write | |
124 | * | |
125 | * Returns: errno | |
126 | * | |
18ec7d5c SW |
127 | * Some of this is copied from block_write_full_page() although we still |
128 | * call it to do most of the work. | |
b3b94faa DT |
129 | */ |
130 | ||
131 | static int gfs2_writepage(struct page *page, struct writeback_control *wbc) | |
132 | { | |
18ec7d5c | 133 | struct inode *inode = page->mapping->host; |
feaa7bba SW |
134 | struct gfs2_inode *ip = GFS2_I(page->mapping->host); |
135 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); | |
18ec7d5c SW |
136 | loff_t i_size = i_size_read(inode); |
137 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
138 | unsigned offset; | |
b3b94faa | 139 | int error; |
18ec7d5c | 140 | int done_trans = 0; |
b3b94faa | 141 | |
b3b94faa DT |
142 | if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) { |
143 | unlock_page(page); | |
144 | return -EIO; | |
145 | } | |
5c676f6d | 146 | if (current->journal_info) |
18ec7d5c SW |
147 | goto out_ignore; |
148 | ||
149 | /* Is the page fully outside i_size? (truncate in progress) */ | |
150 | offset = i_size & (PAGE_CACHE_SIZE-1); | |
d2d7b8a2 | 151 | if (page->index > end_index || (page->index == end_index && !offset)) { |
18ec7d5c | 152 | page->mapping->a_ops->invalidatepage(page, 0); |
b3b94faa | 153 | unlock_page(page); |
18ec7d5c | 154 | return 0; /* don't care */ |
b3b94faa DT |
155 | } |
156 | ||
18ec7d5c SW |
157 | if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip)) { |
158 | error = gfs2_trans_begin(sdp, RES_DINODE + 1, 0); | |
159 | if (error) | |
160 | goto out_ignore; | |
161 | gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1); | |
162 | done_trans = 1; | |
163 | } | |
18ec7d5c SW |
164 | error = block_write_full_page(page, get_block_noalloc, wbc); |
165 | if (done_trans) | |
166 | gfs2_trans_end(sdp); | |
b3b94faa | 167 | gfs2_meta_cache_flush(ip); |
b3b94faa | 168 | return error; |
18ec7d5c SW |
169 | |
170 | out_ignore: | |
171 | redirty_page_for_writepage(wbc, page); | |
172 | unlock_page(page); | |
173 | return 0; | |
b3b94faa DT |
174 | } |
175 | ||
fd88de56 SW |
176 | static int zero_readpage(struct page *page) |
177 | { | |
178 | void *kaddr; | |
179 | ||
180 | kaddr = kmap_atomic(page, KM_USER0); | |
181 | memset(kaddr, 0, PAGE_CACHE_SIZE); | |
182 | kunmap_atomic(page, KM_USER0); | |
183 | ||
184 | SetPageUptodate(page); | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
b3b94faa DT |
189 | /** |
190 | * stuffed_readpage - Fill in a Linux page with stuffed file data | |
191 | * @ip: the inode | |
192 | * @page: the page | |
193 | * | |
194 | * Returns: errno | |
195 | */ | |
196 | ||
197 | static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) | |
198 | { | |
199 | struct buffer_head *dibh; | |
200 | void *kaddr; | |
201 | int error; | |
202 | ||
fd88de56 SW |
203 | /* Only the first page of a stuffed file might contain data */ |
204 | if (unlikely(page->index)) | |
205 | return zero_readpage(page); | |
206 | ||
b3b94faa DT |
207 | error = gfs2_meta_inode_buffer(ip, &dibh); |
208 | if (error) | |
209 | return error; | |
210 | ||
5c4e9e03 | 211 | kaddr = kmap_atomic(page, KM_USER0); |
fd88de56 | 212 | memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), |
b3b94faa | 213 | ip->i_di.di_size); |
fd88de56 | 214 | memset(kaddr + ip->i_di.di_size, 0, PAGE_CACHE_SIZE - ip->i_di.di_size); |
5c4e9e03 | 215 | kunmap_atomic(page, KM_USER0); |
b3b94faa DT |
216 | |
217 | brelse(dibh); | |
218 | ||
219 | SetPageUptodate(page); | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
b3b94faa | 224 | |
b3b94faa DT |
225 | /** |
226 | * gfs2_readpage - readpage with locking | |
18ec7d5c SW |
227 | * @file: The file to read a page for. N.B. This may be NULL if we are |
228 | * reading an internal file. | |
b3b94faa DT |
229 | * @page: The page to read |
230 | * | |
231 | * Returns: errno | |
232 | */ | |
233 | ||
234 | static int gfs2_readpage(struct file *file, struct page *page) | |
235 | { | |
feaa7bba SW |
236 | struct gfs2_inode *ip = GFS2_I(page->mapping->host); |
237 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); | |
18ec7d5c | 238 | struct gfs2_holder gh; |
b3b94faa | 239 | int error; |
59a1cc6b | 240 | int do_unlock = 0; |
b3b94faa | 241 | |
fd88de56 | 242 | if (likely(file != &gfs2_internal_file_sentinal)) { |
59a1cc6b SW |
243 | if (file) { |
244 | struct gfs2_file *gf = file->private_data; | |
245 | if (test_bit(GFF_EXLOCK, &gf->f_flags)) | |
246 | goto skip_lock; | |
247 | } | |
fe1bdedc | 248 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME|GL_AOP, &gh); |
59a1cc6b | 249 | do_unlock = 1; |
61a30dcb | 250 | error = gfs2_glock_nq_m_atime(1, &gh); |
fd88de56 | 251 | if (unlikely(error)) |
61a30dcb SW |
252 | goto out_unlock; |
253 | } | |
b3b94faa | 254 | |
59a1cc6b | 255 | skip_lock: |
18ec7d5c | 256 | if (gfs2_is_stuffed(ip)) { |
fd88de56 SW |
257 | error = stuffed_readpage(ip, page); |
258 | unlock_page(page); | |
b3b94faa | 259 | } else |
18ec7d5c | 260 | error = mpage_readpage(page, gfs2_get_block); |
b3b94faa DT |
261 | |
262 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
263 | error = -EIO; | |
264 | ||
61a30dcb SW |
265 | if (file != &gfs2_internal_file_sentinal) { |
266 | gfs2_glock_dq_m(1, &gh); | |
267 | gfs2_holder_uninit(&gh); | |
268 | } | |
18ec7d5c | 269 | out: |
b3b94faa | 270 | return error; |
18ec7d5c SW |
271 | out_unlock: |
272 | unlock_page(page); | |
59a1cc6b | 273 | if (do_unlock) |
fd88de56 SW |
274 | gfs2_holder_uninit(&gh); |
275 | goto out; | |
276 | } | |
277 | ||
fd88de56 SW |
278 | /** |
279 | * gfs2_readpages - Read a bunch of pages at once | |
280 | * | |
281 | * Some notes: | |
282 | * 1. This is only for readahead, so we can simply ignore any things | |
283 | * which are slightly inconvenient (such as locking conflicts between | |
284 | * the page lock and the glock) and return having done no I/O. Its | |
285 | * obviously not something we'd want to do on too regular a basis. | |
286 | * Any I/O we ignore at this time will be done via readpage later. | |
287 | * 2. We have to handle stuffed files here too. | |
288 | * 3. mpage_readpages() does most of the heavy lifting in the common case. | |
289 | * 4. gfs2_get_block() is relied upon to set BH_Boundary in the right places. | |
290 | * 5. We use LM_FLAG_TRY_1CB here, effectively we then have lock-ahead as | |
291 | * well as read-ahead. | |
292 | */ | |
293 | static int gfs2_readpages(struct file *file, struct address_space *mapping, | |
294 | struct list_head *pages, unsigned nr_pages) | |
295 | { | |
296 | struct inode *inode = mapping->host; | |
feaa7bba SW |
297 | struct gfs2_inode *ip = GFS2_I(inode); |
298 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
fd88de56 SW |
299 | struct gfs2_holder gh; |
300 | unsigned page_idx; | |
301 | int ret; | |
59a1cc6b | 302 | int do_unlock = 0; |
fd88de56 SW |
303 | |
304 | if (likely(file != &gfs2_internal_file_sentinal)) { | |
59a1cc6b SW |
305 | if (file) { |
306 | struct gfs2_file *gf = file->private_data; | |
307 | if (test_bit(GFF_EXLOCK, &gf->f_flags)) | |
308 | goto skip_lock; | |
309 | } | |
fd88de56 SW |
310 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, |
311 | LM_FLAG_TRY_1CB|GL_ATIME|GL_AOP, &gh); | |
59a1cc6b | 312 | do_unlock = 1; |
fd88de56 SW |
313 | ret = gfs2_glock_nq_m_atime(1, &gh); |
314 | if (ret == GLR_TRYFAILED) | |
315 | goto out_noerror; | |
316 | if (unlikely(ret)) | |
317 | goto out_unlock; | |
318 | } | |
59a1cc6b | 319 | skip_lock: |
fd88de56 SW |
320 | if (gfs2_is_stuffed(ip)) { |
321 | struct pagevec lru_pvec; | |
322 | pagevec_init(&lru_pvec, 0); | |
323 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { | |
ffeb874b SW |
324 | struct page *page = list_entry(pages->prev, struct page, lru); |
325 | prefetchw(&page->flags); | |
fd88de56 SW |
326 | list_del(&page->lru); |
327 | if (!add_to_page_cache(page, mapping, | |
328 | page->index, GFP_KERNEL)) { | |
329 | ret = stuffed_readpage(ip, page); | |
330 | unlock_page(page); | |
331 | if (!pagevec_add(&lru_pvec, page)) | |
332 | __pagevec_lru_add(&lru_pvec); | |
ffeb874b SW |
333 | } else { |
334 | page_cache_release(page); | |
fd88de56 | 335 | } |
fd88de56 SW |
336 | } |
337 | pagevec_lru_add(&lru_pvec); | |
338 | ret = 0; | |
339 | } else { | |
340 | /* What we really want to do .... */ | |
341 | ret = mpage_readpages(mapping, pages, nr_pages, gfs2_get_block); | |
342 | } | |
343 | ||
59a1cc6b | 344 | if (do_unlock) { |
fd88de56 SW |
345 | gfs2_glock_dq_m(1, &gh); |
346 | gfs2_holder_uninit(&gh); | |
347 | } | |
348 | out: | |
349 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
350 | ret = -EIO; | |
351 | return ret; | |
352 | out_noerror: | |
353 | ret = 0; | |
354 | out_unlock: | |
355 | /* unlock all pages, we can't do any I/O right now */ | |
356 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { | |
ffeb874b | 357 | struct page *page = list_entry(pages->prev, struct page, lru); |
fd88de56 SW |
358 | list_del(&page->lru); |
359 | unlock_page(page); | |
360 | page_cache_release(page); | |
361 | } | |
59a1cc6b | 362 | if (do_unlock) |
fd88de56 | 363 | gfs2_holder_uninit(&gh); |
18ec7d5c | 364 | goto out; |
b3b94faa DT |
365 | } |
366 | ||
367 | /** | |
368 | * gfs2_prepare_write - Prepare to write a page to a file | |
369 | * @file: The file to write to | |
370 | * @page: The page which is to be prepared for writing | |
371 | * @from: From (byte range within page) | |
372 | * @to: To (byte range within page) | |
373 | * | |
374 | * Returns: errno | |
375 | */ | |
376 | ||
377 | static int gfs2_prepare_write(struct file *file, struct page *page, | |
378 | unsigned from, unsigned to) | |
379 | { | |
feaa7bba SW |
380 | struct gfs2_inode *ip = GFS2_I(page->mapping->host); |
381 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); | |
18ec7d5c SW |
382 | unsigned int data_blocks, ind_blocks, rblocks; |
383 | int alloc_required; | |
b3b94faa | 384 | int error = 0; |
18ec7d5c SW |
385 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + from; |
386 | loff_t end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
387 | struct gfs2_alloc *al; | |
b3b94faa | 388 | |
fe1bdedc | 389 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME|GL_AOP, &ip->i_gh); |
18ec7d5c SW |
390 | error = gfs2_glock_nq_m_atime(1, &ip->i_gh); |
391 | if (error) | |
392 | goto out_uninit; | |
b3b94faa | 393 | |
18ec7d5c SW |
394 | gfs2_write_calc_reserv(ip, to - from, &data_blocks, &ind_blocks); |
395 | ||
396 | error = gfs2_write_alloc_required(ip, pos, from - to, &alloc_required); | |
397 | if (error) | |
398 | goto out_unlock; | |
b3b94faa | 399 | |
18ec7d5c SW |
400 | |
401 | if (alloc_required) { | |
402 | al = gfs2_alloc_get(ip); | |
403 | ||
404 | error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
405 | if (error) | |
406 | goto out_alloc_put; | |
407 | ||
408 | error = gfs2_quota_check(ip, ip->i_di.di_uid, ip->i_di.di_gid); | |
409 | if (error) | |
410 | goto out_qunlock; | |
411 | ||
412 | al->al_requested = data_blocks + ind_blocks; | |
413 | error = gfs2_inplace_reserve(ip); | |
414 | if (error) | |
415 | goto out_qunlock; | |
416 | } | |
417 | ||
418 | rblocks = RES_DINODE + ind_blocks; | |
419 | if (gfs2_is_jdata(ip)) | |
420 | rblocks += data_blocks ? data_blocks : 1; | |
421 | if (ind_blocks || data_blocks) | |
422 | rblocks += RES_STATFS + RES_QUOTA; | |
423 | ||
424 | error = gfs2_trans_begin(sdp, rblocks, 0); | |
425 | if (error) | |
426 | goto out; | |
427 | ||
428 | if (gfs2_is_stuffed(ip)) { | |
429 | if (end > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { | |
f25ef0c1 | 430 | error = gfs2_unstuff_dinode(ip, page); |
5c4e9e03 SW |
431 | if (error == 0) |
432 | goto prepare_write; | |
433 | } else if (!PageUptodate(page)) | |
b3b94faa | 434 | error = stuffed_readpage(ip, page); |
5c4e9e03 | 435 | goto out; |
18ec7d5c SW |
436 | } |
437 | ||
5c4e9e03 | 438 | prepare_write: |
18ec7d5c SW |
439 | error = block_prepare_write(page, from, to, gfs2_get_block); |
440 | ||
441 | out: | |
442 | if (error) { | |
443 | gfs2_trans_end(sdp); | |
444 | if (alloc_required) { | |
445 | gfs2_inplace_release(ip); | |
446 | out_qunlock: | |
447 | gfs2_quota_unlock(ip); | |
448 | out_alloc_put: | |
449 | gfs2_alloc_put(ip); | |
450 | } | |
451 | out_unlock: | |
452 | gfs2_glock_dq_m(1, &ip->i_gh); | |
453 | out_uninit: | |
454 | gfs2_holder_uninit(&ip->i_gh); | |
455 | } | |
b3b94faa DT |
456 | |
457 | return error; | |
458 | } | |
459 | ||
460 | /** | |
461 | * gfs2_commit_write - Commit write to a file | |
462 | * @file: The file to write to | |
463 | * @page: The page containing the data | |
464 | * @from: From (byte range within page) | |
465 | * @to: To (byte range within page) | |
466 | * | |
467 | * Returns: errno | |
468 | */ | |
469 | ||
470 | static int gfs2_commit_write(struct file *file, struct page *page, | |
471 | unsigned from, unsigned to) | |
472 | { | |
473 | struct inode *inode = page->mapping->host; | |
feaa7bba SW |
474 | struct gfs2_inode *ip = GFS2_I(inode); |
475 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
18ec7d5c SW |
476 | int error = -EOPNOTSUPP; |
477 | struct buffer_head *dibh; | |
478 | struct gfs2_alloc *al = &ip->i_alloc;; | |
b3b94faa | 479 | |
18ec7d5c SW |
480 | if (gfs2_assert_withdraw(sdp, gfs2_glock_is_locked_by_me(ip->i_gl))) |
481 | goto fail_nounlock; | |
482 | ||
483 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
484 | if (error) | |
485 | goto fail_endtrans; | |
486 | ||
487 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); | |
488 | ||
b3b94faa | 489 | if (gfs2_is_stuffed(ip)) { |
b3b94faa DT |
490 | uint64_t file_size; |
491 | void *kaddr; | |
492 | ||
493 | file_size = ((uint64_t)page->index << PAGE_CACHE_SHIFT) + to; | |
494 | ||
18ec7d5c | 495 | kaddr = kmap_atomic(page, KM_USER0); |
b3b94faa | 496 | memcpy(dibh->b_data + sizeof(struct gfs2_dinode) + from, |
18ec7d5c SW |
497 | (char *)kaddr + from, to - from); |
498 | kunmap_atomic(page, KM_USER0); | |
b3b94faa DT |
499 | |
500 | SetPageUptodate(page); | |
501 | ||
502 | if (inode->i_size < file_size) | |
503 | i_size_write(inode, file_size); | |
504 | } else { | |
568f4c96 SW |
505 | if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || |
506 | gfs2_is_jdata(ip)) | |
257f9b4e | 507 | gfs2_page_add_databufs(ip, page, from, to); |
b3b94faa DT |
508 | error = generic_commit_write(file, page, from, to); |
509 | if (error) | |
510 | goto fail; | |
511 | } | |
512 | ||
18ec7d5c SW |
513 | if (ip->i_di.di_size < inode->i_size) |
514 | ip->i_di.di_size = inode->i_size; | |
515 | ||
516 | gfs2_dinode_out(&ip->i_di, dibh->b_data); | |
517 | brelse(dibh); | |
518 | gfs2_trans_end(sdp); | |
519 | if (al->al_requested) { | |
520 | gfs2_inplace_release(ip); | |
521 | gfs2_quota_unlock(ip); | |
522 | gfs2_alloc_put(ip); | |
523 | } | |
524 | gfs2_glock_dq_m(1, &ip->i_gh); | |
525 | gfs2_holder_uninit(&ip->i_gh); | |
b3b94faa DT |
526 | return 0; |
527 | ||
18ec7d5c SW |
528 | fail: |
529 | brelse(dibh); | |
530 | fail_endtrans: | |
531 | gfs2_trans_end(sdp); | |
532 | if (al->al_requested) { | |
533 | gfs2_inplace_release(ip); | |
534 | gfs2_quota_unlock(ip); | |
535 | gfs2_alloc_put(ip); | |
536 | } | |
537 | gfs2_glock_dq_m(1, &ip->i_gh); | |
538 | gfs2_holder_uninit(&ip->i_gh); | |
539 | fail_nounlock: | |
b3b94faa | 540 | ClearPageUptodate(page); |
b3b94faa DT |
541 | return error; |
542 | } | |
543 | ||
544 | /** | |
545 | * gfs2_bmap - Block map function | |
546 | * @mapping: Address space info | |
547 | * @lblock: The block to map | |
548 | * | |
549 | * Returns: The disk address for the block or 0 on hole or error | |
550 | */ | |
551 | ||
552 | static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) | |
553 | { | |
feaa7bba | 554 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
b3b94faa DT |
555 | struct gfs2_holder i_gh; |
556 | sector_t dblock = 0; | |
557 | int error; | |
558 | ||
b3b94faa DT |
559 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
560 | if (error) | |
561 | return 0; | |
562 | ||
563 | if (!gfs2_is_stuffed(ip)) | |
4ff14670 | 564 | dblock = generic_block_bmap(mapping, lblock, gfs2_get_block); |
b3b94faa DT |
565 | |
566 | gfs2_glock_dq_uninit(&i_gh); | |
567 | ||
568 | return dblock; | |
569 | } | |
570 | ||
571 | static void discard_buffer(struct gfs2_sbd *sdp, struct buffer_head *bh) | |
572 | { | |
64fb4eb7 | 573 | struct gfs2_bufdata *bd; |
b3b94faa DT |
574 | |
575 | gfs2_log_lock(sdp); | |
5c676f6d | 576 | bd = bh->b_private; |
64fb4eb7 SW |
577 | if (bd) { |
578 | bd->bd_bh = NULL; | |
5c676f6d | 579 | bh->b_private = NULL; |
b3b94faa DT |
580 | gfs2_log_unlock(sdp); |
581 | brelse(bh); | |
582 | } else | |
583 | gfs2_log_unlock(sdp); | |
584 | ||
585 | lock_buffer(bh); | |
586 | clear_buffer_dirty(bh); | |
587 | bh->b_bdev = NULL; | |
588 | clear_buffer_mapped(bh); | |
589 | clear_buffer_req(bh); | |
590 | clear_buffer_new(bh); | |
591 | clear_buffer_delay(bh); | |
592 | unlock_buffer(bh); | |
593 | } | |
594 | ||
8628de05 | 595 | static void gfs2_invalidatepage(struct page *page, unsigned long offset) |
b3b94faa | 596 | { |
5c676f6d | 597 | struct gfs2_sbd *sdp = page->mapping->host->i_sb->s_fs_info; |
b3b94faa DT |
598 | struct buffer_head *head, *bh, *next; |
599 | unsigned int curr_off = 0; | |
b3b94faa DT |
600 | |
601 | BUG_ON(!PageLocked(page)); | |
602 | if (!page_has_buffers(page)) | |
8628de05 | 603 | return; |
b3b94faa DT |
604 | |
605 | bh = head = page_buffers(page); | |
606 | do { | |
607 | unsigned int next_off = curr_off + bh->b_size; | |
608 | next = bh->b_this_page; | |
609 | ||
610 | if (offset <= curr_off) | |
611 | discard_buffer(sdp, bh); | |
612 | ||
613 | curr_off = next_off; | |
614 | bh = next; | |
615 | } while (bh != head); | |
616 | ||
617 | if (!offset) | |
8628de05 | 618 | try_to_release_page(page, 0); |
b3b94faa | 619 | |
8628de05 | 620 | return; |
b3b94faa DT |
621 | } |
622 | ||
a9e5f4d0 SW |
623 | static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb, |
624 | const struct iovec *iov, loff_t offset, | |
625 | unsigned long nr_segs) | |
d1665e41 SW |
626 | { |
627 | struct file *file = iocb->ki_filp; | |
628 | struct inode *inode = file->f_mapping->host; | |
feaa7bba | 629 | struct gfs2_inode *ip = GFS2_I(inode); |
d1665e41 SW |
630 | struct gfs2_holder gh; |
631 | int rv; | |
632 | ||
a9e5f4d0 SW |
633 | if (rw == READ) |
634 | mutex_lock(&inode->i_mutex); | |
d1665e41 | 635 | /* |
a9e5f4d0 | 636 | * Shared lock, even if its a write, since we do no allocation |
d1665e41 SW |
637 | * on this path. All we need change is atime. |
638 | */ | |
639 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh); | |
640 | rv = gfs2_glock_nq_m_atime(1, &gh); | |
641 | if (rv) | |
642 | goto out; | |
643 | ||
a9e5f4d0 SW |
644 | if (offset > i_size_read(inode)) |
645 | goto out; | |
646 | ||
d1665e41 SW |
647 | /* |
648 | * Should we return an error here? I can't see that O_DIRECT for | |
649 | * a journaled file makes any sense. For now we'll silently fall | |
650 | * back to buffered I/O, likewise we do the same for stuffed | |
651 | * files since they are (a) small and (b) unaligned. | |
652 | */ | |
653 | if (gfs2_is_jdata(ip)) | |
654 | goto out; | |
655 | ||
656 | if (gfs2_is_stuffed(ip)) | |
657 | goto out; | |
658 | ||
a9e5f4d0 SW |
659 | rv = blockdev_direct_IO_own_locking(rw, iocb, inode, |
660 | inode->i_sb->s_bdev, | |
661 | iov, offset, nr_segs, | |
662 | gfs2_get_block, NULL); | |
d1665e41 SW |
663 | out: |
664 | gfs2_glock_dq_m(1, &gh); | |
665 | gfs2_holder_uninit(&gh); | |
a9e5f4d0 SW |
666 | if (rw == READ) |
667 | mutex_unlock(&inode->i_mutex); | |
d1665e41 SW |
668 | |
669 | return rv; | |
670 | } | |
671 | ||
4340fe62 SW |
672 | /** |
673 | * stuck_releasepage - We're stuck in gfs2_releasepage(). Print stuff out. | |
674 | * @bh: the buffer we're stuck on | |
675 | * | |
676 | */ | |
677 | ||
678 | static void stuck_releasepage(struct buffer_head *bh) | |
679 | { | |
680 | struct inode *inode = bh->b_page->mapping->host; | |
681 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; | |
682 | struct gfs2_bufdata *bd = bh->b_private; | |
683 | struct gfs2_glock *gl; | |
684 | ||
685 | fs_warn(sdp, "stuck in gfs2_releasepage() %p\n", inode); | |
686 | fs_warn(sdp, "blkno = %llu, bh->b_count = %d\n", | |
687 | (unsigned long long)bh->b_blocknr, atomic_read(&bh->b_count)); | |
688 | fs_warn(sdp, "pinned = %u\n", buffer_pinned(bh)); | |
689 | fs_warn(sdp, "bh->b_private = %s\n", (bd) ? "!NULL" : "NULL"); | |
690 | ||
691 | if (!bd) | |
692 | return; | |
693 | ||
694 | gl = bd->bd_gl; | |
695 | ||
696 | fs_warn(sdp, "gl = (%u, %llu)\n", | |
697 | gl->gl_name.ln_type, (unsigned long long)gl->gl_name.ln_number); | |
698 | ||
699 | fs_warn(sdp, "bd_list_tr = %s, bd_le.le_list = %s\n", | |
700 | (list_empty(&bd->bd_list_tr)) ? "no" : "yes", | |
701 | (list_empty(&bd->bd_le.le_list)) ? "no" : "yes"); | |
702 | ||
703 | if (gl->gl_ops == &gfs2_inode_glops) { | |
704 | struct gfs2_inode *ip = gl->gl_object; | |
705 | unsigned int x; | |
706 | ||
707 | if (!ip) | |
708 | return; | |
709 | ||
710 | fs_warn(sdp, "ip = %llu %llu\n", | |
711 | (unsigned long long)ip->i_num.no_formal_ino, | |
712 | (unsigned long long)ip->i_num.no_addr); | |
713 | ||
714 | for (x = 0; x < GFS2_MAX_META_HEIGHT; x++) | |
715 | fs_warn(sdp, "ip->i_cache[%u] = %s\n", | |
716 | x, (ip->i_cache[x]) ? "!NULL" : "NULL"); | |
717 | } | |
718 | } | |
719 | ||
720 | /** | |
721 | * gfs2_aspace_releasepage - free the metadata associated with a page | |
722 | * @page: the page that's being released | |
723 | * @gfp_mask: passed from Linux VFS, ignored by us | |
724 | * | |
725 | * Call try_to_free_buffers() if the buffers in this page can be | |
726 | * released. | |
727 | * | |
728 | * Returns: 0 | |
729 | */ | |
730 | ||
731 | int gfs2_releasepage(struct page *page, gfp_t gfp_mask) | |
732 | { | |
733 | struct inode *aspace = page->mapping->host; | |
734 | struct gfs2_sbd *sdp = aspace->i_sb->s_fs_info; | |
735 | struct buffer_head *bh, *head; | |
736 | struct gfs2_bufdata *bd; | |
737 | unsigned long t; | |
738 | ||
739 | if (!page_has_buffers(page)) | |
740 | goto out; | |
741 | ||
742 | head = bh = page_buffers(page); | |
743 | do { | |
744 | t = jiffies; | |
745 | ||
746 | while (atomic_read(&bh->b_count)) { | |
747 | if (atomic_read(&aspace->i_writecount)) { | |
748 | if (time_after_eq(jiffies, t + | |
749 | gfs2_tune_get(sdp, gt_stall_secs) * HZ)) { | |
750 | stuck_releasepage(bh); | |
751 | t = jiffies; | |
752 | } | |
753 | ||
754 | yield(); | |
755 | continue; | |
756 | } | |
757 | ||
758 | return 0; | |
759 | } | |
760 | ||
761 | gfs2_assert_warn(sdp, !buffer_pinned(bh)); | |
762 | ||
763 | bd = bh->b_private; | |
764 | if (bd) { | |
765 | gfs2_assert_warn(sdp, bd->bd_bh == bh); | |
766 | gfs2_assert_warn(sdp, list_empty(&bd->bd_list_tr)); | |
767 | gfs2_assert_warn(sdp, list_empty(&bd->bd_le.le_list)); | |
768 | gfs2_assert_warn(sdp, !bd->bd_ail); | |
769 | kmem_cache_free(gfs2_bufdata_cachep, bd); | |
770 | bh->b_private = NULL; | |
771 | } | |
772 | ||
773 | bh = bh->b_this_page; | |
774 | } | |
775 | while (bh != head); | |
776 | ||
a9e5f4d0 | 777 | out: |
4340fe62 SW |
778 | return try_to_free_buffers(page); |
779 | } | |
780 | ||
66de045d | 781 | const struct address_space_operations gfs2_file_aops = { |
b3b94faa DT |
782 | .writepage = gfs2_writepage, |
783 | .readpage = gfs2_readpage, | |
fd88de56 | 784 | .readpages = gfs2_readpages, |
b3b94faa DT |
785 | .sync_page = block_sync_page, |
786 | .prepare_write = gfs2_prepare_write, | |
787 | .commit_write = gfs2_commit_write, | |
788 | .bmap = gfs2_bmap, | |
789 | .invalidatepage = gfs2_invalidatepage, | |
4340fe62 | 790 | .releasepage = gfs2_releasepage, |
b3b94faa DT |
791 | .direct_IO = gfs2_direct_IO, |
792 | }; | |
793 |