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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 | |
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; |
f4387149 SW |
134 | struct gfs2_inode *ip = GFS2_I(inode); |
135 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
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; | |
f4387149 SW |
161 | if (!page_has_buffers(page)) { |
162 | create_empty_buffers(page, inode->i_sb->s_blocksize, | |
163 | (1 << BH_Dirty)|(1 << BH_Uptodate)); | |
164 | } | |
18ec7d5c SW |
165 | gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1); |
166 | done_trans = 1; | |
167 | } | |
18ec7d5c SW |
168 | error = block_write_full_page(page, get_block_noalloc, wbc); |
169 | if (done_trans) | |
170 | gfs2_trans_end(sdp); | |
b3b94faa | 171 | gfs2_meta_cache_flush(ip); |
b3b94faa | 172 | return error; |
18ec7d5c SW |
173 | |
174 | out_ignore: | |
175 | redirty_page_for_writepage(wbc, page); | |
176 | unlock_page(page); | |
177 | return 0; | |
b3b94faa DT |
178 | } |
179 | ||
fd88de56 SW |
180 | static int zero_readpage(struct page *page) |
181 | { | |
182 | void *kaddr; | |
183 | ||
184 | kaddr = kmap_atomic(page, KM_USER0); | |
185 | memset(kaddr, 0, PAGE_CACHE_SIZE); | |
186 | kunmap_atomic(page, KM_USER0); | |
187 | ||
188 | SetPageUptodate(page); | |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
b3b94faa DT |
193 | /** |
194 | * stuffed_readpage - Fill in a Linux page with stuffed file data | |
195 | * @ip: the inode | |
196 | * @page: the page | |
197 | * | |
198 | * Returns: errno | |
199 | */ | |
200 | ||
201 | static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) | |
202 | { | |
203 | struct buffer_head *dibh; | |
204 | void *kaddr; | |
205 | int error; | |
206 | ||
fd88de56 SW |
207 | /* Only the first page of a stuffed file might contain data */ |
208 | if (unlikely(page->index)) | |
209 | return zero_readpage(page); | |
210 | ||
b3b94faa DT |
211 | error = gfs2_meta_inode_buffer(ip, &dibh); |
212 | if (error) | |
213 | return error; | |
214 | ||
5c4e9e03 | 215 | kaddr = kmap_atomic(page, KM_USER0); |
fd88de56 | 216 | memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), |
b3b94faa | 217 | ip->i_di.di_size); |
fd88de56 | 218 | memset(kaddr + ip->i_di.di_size, 0, PAGE_CACHE_SIZE - ip->i_di.di_size); |
5c4e9e03 | 219 | kunmap_atomic(page, KM_USER0); |
b3b94faa DT |
220 | |
221 | brelse(dibh); | |
222 | ||
223 | SetPageUptodate(page); | |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
b3b94faa | 228 | |
b3b94faa DT |
229 | /** |
230 | * gfs2_readpage - readpage with locking | |
18ec7d5c SW |
231 | * @file: The file to read a page for. N.B. This may be NULL if we are |
232 | * reading an internal file. | |
b3b94faa DT |
233 | * @page: The page to read |
234 | * | |
235 | * Returns: errno | |
236 | */ | |
237 | ||
238 | static int gfs2_readpage(struct file *file, struct page *page) | |
239 | { | |
feaa7bba SW |
240 | struct gfs2_inode *ip = GFS2_I(page->mapping->host); |
241 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); | |
18ec7d5c | 242 | struct gfs2_holder gh; |
b3b94faa | 243 | int error; |
59a1cc6b | 244 | int do_unlock = 0; |
b3b94faa | 245 | |
fd88de56 | 246 | if (likely(file != &gfs2_internal_file_sentinal)) { |
59a1cc6b SW |
247 | if (file) { |
248 | struct gfs2_file *gf = file->private_data; | |
249 | if (test_bit(GFF_EXLOCK, &gf->f_flags)) | |
250 | goto skip_lock; | |
251 | } | |
fe1bdedc | 252 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME|GL_AOP, &gh); |
59a1cc6b | 253 | do_unlock = 1; |
61a30dcb | 254 | error = gfs2_glock_nq_m_atime(1, &gh); |
fd88de56 | 255 | if (unlikely(error)) |
61a30dcb SW |
256 | goto out_unlock; |
257 | } | |
b3b94faa | 258 | |
59a1cc6b | 259 | skip_lock: |
18ec7d5c | 260 | if (gfs2_is_stuffed(ip)) { |
fd88de56 SW |
261 | error = stuffed_readpage(ip, page); |
262 | unlock_page(page); | |
b3b94faa | 263 | } else |
18ec7d5c | 264 | error = mpage_readpage(page, gfs2_get_block); |
b3b94faa DT |
265 | |
266 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
267 | error = -EIO; | |
268 | ||
61a30dcb SW |
269 | if (file != &gfs2_internal_file_sentinal) { |
270 | gfs2_glock_dq_m(1, &gh); | |
271 | gfs2_holder_uninit(&gh); | |
272 | } | |
18ec7d5c | 273 | out: |
b3b94faa | 274 | return error; |
18ec7d5c SW |
275 | out_unlock: |
276 | unlock_page(page); | |
59a1cc6b | 277 | if (do_unlock) |
fd88de56 SW |
278 | gfs2_holder_uninit(&gh); |
279 | goto out; | |
280 | } | |
281 | ||
fd88de56 SW |
282 | /** |
283 | * gfs2_readpages - Read a bunch of pages at once | |
284 | * | |
285 | * Some notes: | |
286 | * 1. This is only for readahead, so we can simply ignore any things | |
287 | * which are slightly inconvenient (such as locking conflicts between | |
288 | * the page lock and the glock) and return having done no I/O. Its | |
289 | * obviously not something we'd want to do on too regular a basis. | |
290 | * Any I/O we ignore at this time will be done via readpage later. | |
291 | * 2. We have to handle stuffed files here too. | |
292 | * 3. mpage_readpages() does most of the heavy lifting in the common case. | |
293 | * 4. gfs2_get_block() is relied upon to set BH_Boundary in the right places. | |
294 | * 5. We use LM_FLAG_TRY_1CB here, effectively we then have lock-ahead as | |
295 | * well as read-ahead. | |
296 | */ | |
297 | static int gfs2_readpages(struct file *file, struct address_space *mapping, | |
298 | struct list_head *pages, unsigned nr_pages) | |
299 | { | |
300 | struct inode *inode = mapping->host; | |
feaa7bba SW |
301 | struct gfs2_inode *ip = GFS2_I(inode); |
302 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
fd88de56 SW |
303 | struct gfs2_holder gh; |
304 | unsigned page_idx; | |
305 | int ret; | |
59a1cc6b | 306 | int do_unlock = 0; |
fd88de56 SW |
307 | |
308 | if (likely(file != &gfs2_internal_file_sentinal)) { | |
59a1cc6b SW |
309 | if (file) { |
310 | struct gfs2_file *gf = file->private_data; | |
311 | if (test_bit(GFF_EXLOCK, &gf->f_flags)) | |
312 | goto skip_lock; | |
313 | } | |
fd88de56 SW |
314 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, |
315 | LM_FLAG_TRY_1CB|GL_ATIME|GL_AOP, &gh); | |
59a1cc6b | 316 | do_unlock = 1; |
fd88de56 SW |
317 | ret = gfs2_glock_nq_m_atime(1, &gh); |
318 | if (ret == GLR_TRYFAILED) | |
319 | goto out_noerror; | |
320 | if (unlikely(ret)) | |
321 | goto out_unlock; | |
322 | } | |
59a1cc6b | 323 | skip_lock: |
fd88de56 SW |
324 | if (gfs2_is_stuffed(ip)) { |
325 | struct pagevec lru_pvec; | |
326 | pagevec_init(&lru_pvec, 0); | |
327 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { | |
ffeb874b SW |
328 | struct page *page = list_entry(pages->prev, struct page, lru); |
329 | prefetchw(&page->flags); | |
fd88de56 SW |
330 | list_del(&page->lru); |
331 | if (!add_to_page_cache(page, mapping, | |
332 | page->index, GFP_KERNEL)) { | |
333 | ret = stuffed_readpage(ip, page); | |
334 | unlock_page(page); | |
335 | if (!pagevec_add(&lru_pvec, page)) | |
336 | __pagevec_lru_add(&lru_pvec); | |
ffeb874b SW |
337 | } else { |
338 | page_cache_release(page); | |
fd88de56 | 339 | } |
fd88de56 SW |
340 | } |
341 | pagevec_lru_add(&lru_pvec); | |
342 | ret = 0; | |
343 | } else { | |
344 | /* What we really want to do .... */ | |
345 | ret = mpage_readpages(mapping, pages, nr_pages, gfs2_get_block); | |
346 | } | |
347 | ||
59a1cc6b | 348 | if (do_unlock) { |
fd88de56 SW |
349 | gfs2_glock_dq_m(1, &gh); |
350 | gfs2_holder_uninit(&gh); | |
351 | } | |
352 | out: | |
353 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
354 | ret = -EIO; | |
355 | return ret; | |
356 | out_noerror: | |
357 | ret = 0; | |
358 | out_unlock: | |
359 | /* unlock all pages, we can't do any I/O right now */ | |
360 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { | |
ffeb874b | 361 | struct page *page = list_entry(pages->prev, struct page, lru); |
fd88de56 SW |
362 | list_del(&page->lru); |
363 | unlock_page(page); | |
364 | page_cache_release(page); | |
365 | } | |
59a1cc6b | 366 | if (do_unlock) |
fd88de56 | 367 | gfs2_holder_uninit(&gh); |
18ec7d5c | 368 | goto out; |
b3b94faa DT |
369 | } |
370 | ||
371 | /** | |
372 | * gfs2_prepare_write - Prepare to write a page to a file | |
373 | * @file: The file to write to | |
374 | * @page: The page which is to be prepared for writing | |
375 | * @from: From (byte range within page) | |
376 | * @to: To (byte range within page) | |
377 | * | |
378 | * Returns: errno | |
379 | */ | |
380 | ||
381 | static int gfs2_prepare_write(struct file *file, struct page *page, | |
382 | unsigned from, unsigned to) | |
383 | { | |
feaa7bba SW |
384 | struct gfs2_inode *ip = GFS2_I(page->mapping->host); |
385 | struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); | |
18ec7d5c SW |
386 | unsigned int data_blocks, ind_blocks, rblocks; |
387 | int alloc_required; | |
b3b94faa | 388 | int error = 0; |
18ec7d5c SW |
389 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + from; |
390 | loff_t end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
391 | struct gfs2_alloc *al; | |
b3b94faa | 392 | |
fe1bdedc | 393 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME|GL_AOP, &ip->i_gh); |
18ec7d5c SW |
394 | error = gfs2_glock_nq_m_atime(1, &ip->i_gh); |
395 | if (error) | |
396 | goto out_uninit; | |
b3b94faa | 397 | |
18ec7d5c SW |
398 | gfs2_write_calc_reserv(ip, to - from, &data_blocks, &ind_blocks); |
399 | ||
400 | error = gfs2_write_alloc_required(ip, pos, from - to, &alloc_required); | |
401 | if (error) | |
402 | goto out_unlock; | |
b3b94faa | 403 | |
18ec7d5c SW |
404 | |
405 | if (alloc_required) { | |
406 | al = gfs2_alloc_get(ip); | |
407 | ||
408 | error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
409 | if (error) | |
410 | goto out_alloc_put; | |
411 | ||
412 | error = gfs2_quota_check(ip, ip->i_di.di_uid, ip->i_di.di_gid); | |
413 | if (error) | |
414 | goto out_qunlock; | |
415 | ||
416 | al->al_requested = data_blocks + ind_blocks; | |
417 | error = gfs2_inplace_reserve(ip); | |
418 | if (error) | |
419 | goto out_qunlock; | |
420 | } | |
421 | ||
422 | rblocks = RES_DINODE + ind_blocks; | |
423 | if (gfs2_is_jdata(ip)) | |
424 | rblocks += data_blocks ? data_blocks : 1; | |
425 | if (ind_blocks || data_blocks) | |
426 | rblocks += RES_STATFS + RES_QUOTA; | |
427 | ||
428 | error = gfs2_trans_begin(sdp, rblocks, 0); | |
429 | if (error) | |
430 | goto out; | |
431 | ||
432 | if (gfs2_is_stuffed(ip)) { | |
433 | if (end > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { | |
f25ef0c1 | 434 | error = gfs2_unstuff_dinode(ip, page); |
5c4e9e03 SW |
435 | if (error == 0) |
436 | goto prepare_write; | |
437 | } else if (!PageUptodate(page)) | |
b3b94faa | 438 | error = stuffed_readpage(ip, page); |
5c4e9e03 | 439 | goto out; |
18ec7d5c SW |
440 | } |
441 | ||
5c4e9e03 | 442 | prepare_write: |
18ec7d5c SW |
443 | error = block_prepare_write(page, from, to, gfs2_get_block); |
444 | ||
445 | out: | |
446 | if (error) { | |
447 | gfs2_trans_end(sdp); | |
448 | if (alloc_required) { | |
449 | gfs2_inplace_release(ip); | |
450 | out_qunlock: | |
451 | gfs2_quota_unlock(ip); | |
452 | out_alloc_put: | |
453 | gfs2_alloc_put(ip); | |
454 | } | |
455 | out_unlock: | |
456 | gfs2_glock_dq_m(1, &ip->i_gh); | |
457 | out_uninit: | |
458 | gfs2_holder_uninit(&ip->i_gh); | |
459 | } | |
b3b94faa DT |
460 | |
461 | return error; | |
462 | } | |
463 | ||
464 | /** | |
465 | * gfs2_commit_write - Commit write to a file | |
466 | * @file: The file to write to | |
467 | * @page: The page containing the data | |
468 | * @from: From (byte range within page) | |
469 | * @to: To (byte range within page) | |
470 | * | |
471 | * Returns: errno | |
472 | */ | |
473 | ||
474 | static int gfs2_commit_write(struct file *file, struct page *page, | |
475 | unsigned from, unsigned to) | |
476 | { | |
477 | struct inode *inode = page->mapping->host; | |
feaa7bba SW |
478 | struct gfs2_inode *ip = GFS2_I(inode); |
479 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
18ec7d5c SW |
480 | int error = -EOPNOTSUPP; |
481 | struct buffer_head *dibh; | |
482 | struct gfs2_alloc *al = &ip->i_alloc;; | |
b3b94faa | 483 | |
18ec7d5c SW |
484 | if (gfs2_assert_withdraw(sdp, gfs2_glock_is_locked_by_me(ip->i_gl))) |
485 | goto fail_nounlock; | |
486 | ||
487 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
488 | if (error) | |
489 | goto fail_endtrans; | |
490 | ||
491 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); | |
492 | ||
b3b94faa | 493 | if (gfs2_is_stuffed(ip)) { |
b3b94faa DT |
494 | uint64_t file_size; |
495 | void *kaddr; | |
496 | ||
497 | file_size = ((uint64_t)page->index << PAGE_CACHE_SHIFT) + to; | |
498 | ||
18ec7d5c | 499 | kaddr = kmap_atomic(page, KM_USER0); |
b3b94faa | 500 | memcpy(dibh->b_data + sizeof(struct gfs2_dinode) + from, |
18ec7d5c SW |
501 | (char *)kaddr + from, to - from); |
502 | kunmap_atomic(page, KM_USER0); | |
b3b94faa DT |
503 | |
504 | SetPageUptodate(page); | |
505 | ||
506 | if (inode->i_size < file_size) | |
507 | i_size_write(inode, file_size); | |
508 | } else { | |
568f4c96 SW |
509 | if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || |
510 | gfs2_is_jdata(ip)) | |
257f9b4e | 511 | gfs2_page_add_databufs(ip, page, from, to); |
b3b94faa DT |
512 | error = generic_commit_write(file, page, from, to); |
513 | if (error) | |
514 | goto fail; | |
515 | } | |
516 | ||
18ec7d5c SW |
517 | if (ip->i_di.di_size < inode->i_size) |
518 | ip->i_di.di_size = inode->i_size; | |
519 | ||
520 | gfs2_dinode_out(&ip->i_di, dibh->b_data); | |
521 | brelse(dibh); | |
522 | gfs2_trans_end(sdp); | |
523 | if (al->al_requested) { | |
524 | gfs2_inplace_release(ip); | |
525 | gfs2_quota_unlock(ip); | |
526 | gfs2_alloc_put(ip); | |
527 | } | |
528 | gfs2_glock_dq_m(1, &ip->i_gh); | |
529 | gfs2_holder_uninit(&ip->i_gh); | |
b3b94faa DT |
530 | return 0; |
531 | ||
18ec7d5c SW |
532 | fail: |
533 | brelse(dibh); | |
534 | fail_endtrans: | |
535 | gfs2_trans_end(sdp); | |
536 | if (al->al_requested) { | |
537 | gfs2_inplace_release(ip); | |
538 | gfs2_quota_unlock(ip); | |
539 | gfs2_alloc_put(ip); | |
540 | } | |
541 | gfs2_glock_dq_m(1, &ip->i_gh); | |
542 | gfs2_holder_uninit(&ip->i_gh); | |
543 | fail_nounlock: | |
b3b94faa | 544 | ClearPageUptodate(page); |
b3b94faa DT |
545 | return error; |
546 | } | |
547 | ||
548 | /** | |
549 | * gfs2_bmap - Block map function | |
550 | * @mapping: Address space info | |
551 | * @lblock: The block to map | |
552 | * | |
553 | * Returns: The disk address for the block or 0 on hole or error | |
554 | */ | |
555 | ||
556 | static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) | |
557 | { | |
feaa7bba | 558 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
b3b94faa DT |
559 | struct gfs2_holder i_gh; |
560 | sector_t dblock = 0; | |
561 | int error; | |
562 | ||
b3b94faa DT |
563 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
564 | if (error) | |
565 | return 0; | |
566 | ||
567 | if (!gfs2_is_stuffed(ip)) | |
4ff14670 | 568 | dblock = generic_block_bmap(mapping, lblock, gfs2_get_block); |
b3b94faa DT |
569 | |
570 | gfs2_glock_dq_uninit(&i_gh); | |
571 | ||
572 | return dblock; | |
573 | } | |
574 | ||
575 | static void discard_buffer(struct gfs2_sbd *sdp, struct buffer_head *bh) | |
576 | { | |
64fb4eb7 | 577 | struct gfs2_bufdata *bd; |
b3b94faa DT |
578 | |
579 | gfs2_log_lock(sdp); | |
5c676f6d | 580 | bd = bh->b_private; |
64fb4eb7 SW |
581 | if (bd) { |
582 | bd->bd_bh = NULL; | |
5c676f6d | 583 | bh->b_private = NULL; |
b3b94faa DT |
584 | gfs2_log_unlock(sdp); |
585 | brelse(bh); | |
586 | } else | |
587 | gfs2_log_unlock(sdp); | |
588 | ||
589 | lock_buffer(bh); | |
590 | clear_buffer_dirty(bh); | |
591 | bh->b_bdev = NULL; | |
592 | clear_buffer_mapped(bh); | |
593 | clear_buffer_req(bh); | |
594 | clear_buffer_new(bh); | |
595 | clear_buffer_delay(bh); | |
596 | unlock_buffer(bh); | |
597 | } | |
598 | ||
8628de05 | 599 | static void gfs2_invalidatepage(struct page *page, unsigned long offset) |
b3b94faa | 600 | { |
5c676f6d | 601 | struct gfs2_sbd *sdp = page->mapping->host->i_sb->s_fs_info; |
b3b94faa DT |
602 | struct buffer_head *head, *bh, *next; |
603 | unsigned int curr_off = 0; | |
b3b94faa DT |
604 | |
605 | BUG_ON(!PageLocked(page)); | |
606 | if (!page_has_buffers(page)) | |
8628de05 | 607 | return; |
b3b94faa DT |
608 | |
609 | bh = head = page_buffers(page); | |
610 | do { | |
611 | unsigned int next_off = curr_off + bh->b_size; | |
612 | next = bh->b_this_page; | |
613 | ||
614 | if (offset <= curr_off) | |
615 | discard_buffer(sdp, bh); | |
616 | ||
617 | curr_off = next_off; | |
618 | bh = next; | |
619 | } while (bh != head); | |
620 | ||
621 | if (!offset) | |
8628de05 | 622 | try_to_release_page(page, 0); |
b3b94faa | 623 | |
8628de05 | 624 | return; |
b3b94faa DT |
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 | ||
a9e5f4d0 SW |
637 | if (rw == READ) |
638 | mutex_lock(&inode->i_mutex); | |
d1665e41 | 639 | /* |
a9e5f4d0 | 640 | * Shared lock, even if its a write, since we do no allocation |
d1665e41 SW |
641 | * on this path. All we need change is atime. |
642 | */ | |
643 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh); | |
644 | rv = gfs2_glock_nq_m_atime(1, &gh); | |
645 | if (rv) | |
646 | goto out; | |
647 | ||
a9e5f4d0 SW |
648 | if (offset > i_size_read(inode)) |
649 | goto out; | |
650 | ||
d1665e41 SW |
651 | /* |
652 | * Should we return an error here? I can't see that O_DIRECT for | |
653 | * a journaled file makes any sense. For now we'll silently fall | |
654 | * back to buffered I/O, likewise we do the same for stuffed | |
655 | * files since they are (a) small and (b) unaligned. | |
656 | */ | |
657 | if (gfs2_is_jdata(ip)) | |
658 | goto out; | |
659 | ||
660 | if (gfs2_is_stuffed(ip)) | |
661 | goto out; | |
662 | ||
a9e5f4d0 SW |
663 | rv = blockdev_direct_IO_own_locking(rw, iocb, inode, |
664 | inode->i_sb->s_bdev, | |
665 | iov, offset, nr_segs, | |
666 | gfs2_get_block, NULL); | |
d1665e41 SW |
667 | out: |
668 | gfs2_glock_dq_m(1, &gh); | |
669 | gfs2_holder_uninit(&gh); | |
a9e5f4d0 SW |
670 | if (rw == READ) |
671 | mutex_unlock(&inode->i_mutex); | |
d1665e41 SW |
672 | |
673 | return rv; | |
674 | } | |
675 | ||
4340fe62 SW |
676 | /** |
677 | * stuck_releasepage - We're stuck in gfs2_releasepage(). Print stuff out. | |
678 | * @bh: the buffer we're stuck on | |
679 | * | |
680 | */ | |
681 | ||
682 | static void stuck_releasepage(struct buffer_head *bh) | |
683 | { | |
684 | struct inode *inode = bh->b_page->mapping->host; | |
685 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; | |
686 | struct gfs2_bufdata *bd = bh->b_private; | |
687 | struct gfs2_glock *gl; | |
688 | ||
689 | fs_warn(sdp, "stuck in gfs2_releasepage() %p\n", inode); | |
690 | fs_warn(sdp, "blkno = %llu, bh->b_count = %d\n", | |
691 | (unsigned long long)bh->b_blocknr, atomic_read(&bh->b_count)); | |
692 | fs_warn(sdp, "pinned = %u\n", buffer_pinned(bh)); | |
693 | fs_warn(sdp, "bh->b_private = %s\n", (bd) ? "!NULL" : "NULL"); | |
694 | ||
695 | if (!bd) | |
696 | return; | |
697 | ||
698 | gl = bd->bd_gl; | |
699 | ||
700 | fs_warn(sdp, "gl = (%u, %llu)\n", | |
701 | gl->gl_name.ln_type, (unsigned long long)gl->gl_name.ln_number); | |
702 | ||
703 | fs_warn(sdp, "bd_list_tr = %s, bd_le.le_list = %s\n", | |
704 | (list_empty(&bd->bd_list_tr)) ? "no" : "yes", | |
705 | (list_empty(&bd->bd_le.le_list)) ? "no" : "yes"); | |
706 | ||
707 | if (gl->gl_ops == &gfs2_inode_glops) { | |
708 | struct gfs2_inode *ip = gl->gl_object; | |
709 | unsigned int x; | |
710 | ||
711 | if (!ip) | |
712 | return; | |
713 | ||
714 | fs_warn(sdp, "ip = %llu %llu\n", | |
715 | (unsigned long long)ip->i_num.no_formal_ino, | |
716 | (unsigned long long)ip->i_num.no_addr); | |
717 | ||
718 | for (x = 0; x < GFS2_MAX_META_HEIGHT; x++) | |
719 | fs_warn(sdp, "ip->i_cache[%u] = %s\n", | |
720 | x, (ip->i_cache[x]) ? "!NULL" : "NULL"); | |
721 | } | |
722 | } | |
723 | ||
724 | /** | |
725 | * gfs2_aspace_releasepage - free the metadata associated with a page | |
726 | * @page: the page that's being released | |
727 | * @gfp_mask: passed from Linux VFS, ignored by us | |
728 | * | |
729 | * Call try_to_free_buffers() if the buffers in this page can be | |
730 | * released. | |
731 | * | |
732 | * Returns: 0 | |
733 | */ | |
734 | ||
735 | int gfs2_releasepage(struct page *page, gfp_t gfp_mask) | |
736 | { | |
737 | struct inode *aspace = page->mapping->host; | |
738 | struct gfs2_sbd *sdp = aspace->i_sb->s_fs_info; | |
739 | struct buffer_head *bh, *head; | |
740 | struct gfs2_bufdata *bd; | |
741 | unsigned long t; | |
742 | ||
743 | if (!page_has_buffers(page)) | |
744 | goto out; | |
745 | ||
746 | head = bh = page_buffers(page); | |
747 | do { | |
748 | t = jiffies; | |
749 | ||
750 | while (atomic_read(&bh->b_count)) { | |
751 | if (atomic_read(&aspace->i_writecount)) { | |
752 | if (time_after_eq(jiffies, t + | |
753 | gfs2_tune_get(sdp, gt_stall_secs) * HZ)) { | |
754 | stuck_releasepage(bh); | |
755 | t = jiffies; | |
756 | } | |
757 | ||
758 | yield(); | |
759 | continue; | |
760 | } | |
761 | ||
762 | return 0; | |
763 | } | |
764 | ||
765 | gfs2_assert_warn(sdp, !buffer_pinned(bh)); | |
766 | ||
767 | bd = bh->b_private; | |
768 | if (bd) { | |
769 | gfs2_assert_warn(sdp, bd->bd_bh == bh); | |
770 | gfs2_assert_warn(sdp, list_empty(&bd->bd_list_tr)); | |
771 | gfs2_assert_warn(sdp, list_empty(&bd->bd_le.le_list)); | |
772 | gfs2_assert_warn(sdp, !bd->bd_ail); | |
773 | kmem_cache_free(gfs2_bufdata_cachep, bd); | |
774 | bh->b_private = NULL; | |
775 | } | |
776 | ||
777 | bh = bh->b_this_page; | |
778 | } | |
779 | while (bh != head); | |
780 | ||
a9e5f4d0 | 781 | out: |
4340fe62 SW |
782 | return try_to_free_buffers(page); |
783 | } | |
784 | ||
66de045d | 785 | const struct address_space_operations gfs2_file_aops = { |
b3b94faa DT |
786 | .writepage = gfs2_writepage, |
787 | .readpage = gfs2_readpage, | |
fd88de56 | 788 | .readpages = gfs2_readpages, |
b3b94faa DT |
789 | .sync_page = block_sync_page, |
790 | .prepare_write = gfs2_prepare_write, | |
791 | .commit_write = gfs2_commit_write, | |
792 | .bmap = gfs2_bmap, | |
793 | .invalidatepage = gfs2_invalidatepage, | |
4340fe62 | 794 | .releasepage = gfs2_releasepage, |
b3b94faa DT |
795 | .direct_IO = gfs2_direct_IO, |
796 | }; | |
797 |