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5eb563f5 RK |
1 | /* |
2 | * mdt.c - meta data file for NILFS | |
3 | * | |
4 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | * | |
20 | * Written by Ryusuke Konishi <ryusuke@osrg.net> | |
21 | */ | |
22 | ||
23 | #include <linux/buffer_head.h> | |
24 | #include <linux/mpage.h> | |
25 | #include <linux/mm.h> | |
26 | #include <linux/writeback.h> | |
27 | #include <linux/backing-dev.h> | |
28 | #include <linux/swap.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
5eb563f5 | 30 | #include "nilfs.h" |
05d0e94b | 31 | #include "btnode.h" |
5eb563f5 RK |
32 | #include "segment.h" |
33 | #include "page.h" | |
34 | #include "mdt.h" | |
35 | ||
36 | ||
37 | #define NILFS_MDT_MAX_RA_BLOCKS (16 - 1) | |
38 | ||
5eb563f5 RK |
39 | |
40 | static int | |
41 | nilfs_mdt_insert_new_block(struct inode *inode, unsigned long block, | |
42 | struct buffer_head *bh, | |
43 | void (*init_block)(struct inode *, | |
44 | struct buffer_head *, void *)) | |
45 | { | |
46 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
47 | void *kaddr; | |
48 | int ret; | |
49 | ||
50 | /* Caller exclude read accesses using page lock */ | |
51 | ||
52 | /* set_buffer_new(bh); */ | |
53 | bh->b_blocknr = 0; | |
54 | ||
55 | ret = nilfs_bmap_insert(ii->i_bmap, block, (unsigned long)bh); | |
56 | if (unlikely(ret)) | |
57 | return ret; | |
58 | ||
59 | set_buffer_mapped(bh); | |
60 | ||
7b9c0976 | 61 | kaddr = kmap_atomic(bh->b_page); |
5eb563f5 RK |
62 | memset(kaddr + bh_offset(bh), 0, 1 << inode->i_blkbits); |
63 | if (init_block) | |
64 | init_block(inode, bh, kaddr); | |
65 | flush_dcache_page(bh->b_page); | |
7b9c0976 | 66 | kunmap_atomic(kaddr); |
5eb563f5 RK |
67 | |
68 | set_buffer_uptodate(bh); | |
5fc7b141 | 69 | mark_buffer_dirty(bh); |
5eb563f5 RK |
70 | nilfs_mdt_mark_dirty(inode); |
71 | return 0; | |
72 | } | |
73 | ||
74 | static int nilfs_mdt_create_block(struct inode *inode, unsigned long block, | |
75 | struct buffer_head **out_bh, | |
76 | void (*init_block)(struct inode *, | |
77 | struct buffer_head *, | |
78 | void *)) | |
79 | { | |
5eb563f5 RK |
80 | struct super_block *sb = inode->i_sb; |
81 | struct nilfs_transaction_info ti; | |
82 | struct buffer_head *bh; | |
83 | int err; | |
84 | ||
5eb563f5 RK |
85 | nilfs_transaction_begin(sb, &ti, 0); |
86 | ||
87 | err = -ENOMEM; | |
88 | bh = nilfs_grab_buffer(inode, inode->i_mapping, block, 0); | |
89 | if (unlikely(!bh)) | |
90 | goto failed_unlock; | |
91 | ||
92 | err = -EEXIST; | |
14351104 | 93 | if (buffer_uptodate(bh)) |
5eb563f5 | 94 | goto failed_bh; |
14351104 | 95 | |
5eb563f5 RK |
96 | wait_on_buffer(bh); |
97 | if (buffer_uptodate(bh)) | |
98 | goto failed_bh; | |
5eb563f5 | 99 | |
090fd5b1 | 100 | bh->b_bdev = sb->s_bdev; |
5eb563f5 RK |
101 | err = nilfs_mdt_insert_new_block(inode, block, bh, init_block); |
102 | if (likely(!err)) { | |
103 | get_bh(bh); | |
104 | *out_bh = bh; | |
105 | } | |
106 | ||
107 | failed_bh: | |
108 | unlock_page(bh->b_page); | |
109 | page_cache_release(bh->b_page); | |
110 | brelse(bh); | |
111 | ||
112 | failed_unlock: | |
47420c79 RK |
113 | if (likely(!err)) |
114 | err = nilfs_transaction_commit(sb); | |
115 | else | |
116 | nilfs_transaction_abort(sb); | |
090fd5b1 | 117 | |
5eb563f5 RK |
118 | return err; |
119 | } | |
120 | ||
121 | static int | |
122 | nilfs_mdt_submit_block(struct inode *inode, unsigned long blkoff, | |
123 | int mode, struct buffer_head **out_bh) | |
124 | { | |
125 | struct buffer_head *bh; | |
0f3fe33b | 126 | __u64 blknum = 0; |
5eb563f5 RK |
127 | int ret = -ENOMEM; |
128 | ||
129 | bh = nilfs_grab_buffer(inode, inode->i_mapping, blkoff, 0); | |
130 | if (unlikely(!bh)) | |
131 | goto failed; | |
132 | ||
133 | ret = -EEXIST; /* internal code */ | |
134 | if (buffer_uptodate(bh)) | |
135 | goto out; | |
136 | ||
137 | if (mode == READA) { | |
138 | if (!trylock_buffer(bh)) { | |
139 | ret = -EBUSY; | |
140 | goto failed_bh; | |
141 | } | |
1f5abe7e | 142 | } else /* mode == READ */ |
5eb563f5 | 143 | lock_buffer(bh); |
5eb563f5 RK |
144 | |
145 | if (buffer_uptodate(bh)) { | |
146 | unlock_buffer(bh); | |
147 | goto out; | |
148 | } | |
14351104 RK |
149 | |
150 | ret = nilfs_bmap_lookup(NILFS_I(inode)->i_bmap, blkoff, &blknum); | |
151 | if (unlikely(ret)) { | |
152 | unlock_buffer(bh); | |
153 | goto failed_bh; | |
5eb563f5 | 154 | } |
c6e07188 | 155 | map_bh(bh, inode->i_sb, (sector_t)blknum); |
5eb563f5 RK |
156 | |
157 | bh->b_end_io = end_buffer_read_sync; | |
158 | get_bh(bh); | |
159 | submit_bh(mode, bh); | |
160 | ret = 0; | |
161 | out: | |
162 | get_bh(bh); | |
163 | *out_bh = bh; | |
164 | ||
165 | failed_bh: | |
166 | unlock_page(bh->b_page); | |
167 | page_cache_release(bh->b_page); | |
168 | brelse(bh); | |
169 | failed: | |
170 | return ret; | |
171 | } | |
172 | ||
173 | static int nilfs_mdt_read_block(struct inode *inode, unsigned long block, | |
b34a6506 | 174 | int readahead, struct buffer_head **out_bh) |
5eb563f5 RK |
175 | { |
176 | struct buffer_head *first_bh, *bh; | |
177 | unsigned long blkoff; | |
178 | int i, nr_ra_blocks = NILFS_MDT_MAX_RA_BLOCKS; | |
179 | int err; | |
180 | ||
181 | err = nilfs_mdt_submit_block(inode, block, READ, &first_bh); | |
182 | if (err == -EEXIST) /* internal code */ | |
183 | goto out; | |
184 | ||
185 | if (unlikely(err)) | |
186 | goto failed; | |
187 | ||
b34a6506 RK |
188 | if (readahead) { |
189 | blkoff = block + 1; | |
190 | for (i = 0; i < nr_ra_blocks; i++, blkoff++) { | |
191 | err = nilfs_mdt_submit_block(inode, blkoff, READA, &bh); | |
192 | if (likely(!err || err == -EEXIST)) | |
193 | brelse(bh); | |
194 | else if (err != -EBUSY) | |
195 | break; | |
196 | /* abort readahead if bmap lookup failed */ | |
197 | if (!buffer_locked(first_bh)) | |
198 | goto out_no_wait; | |
199 | } | |
5eb563f5 RK |
200 | } |
201 | ||
202 | wait_on_buffer(first_bh); | |
203 | ||
204 | out_no_wait: | |
205 | err = -EIO; | |
206 | if (!buffer_uptodate(first_bh)) | |
207 | goto failed_bh; | |
208 | out: | |
209 | *out_bh = first_bh; | |
210 | return 0; | |
211 | ||
212 | failed_bh: | |
213 | brelse(first_bh); | |
214 | failed: | |
215 | return err; | |
216 | } | |
217 | ||
218 | /** | |
219 | * nilfs_mdt_get_block - read or create a buffer on meta data file. | |
220 | * @inode: inode of the meta data file | |
221 | * @blkoff: block offset | |
222 | * @create: create flag | |
223 | * @init_block: initializer used for newly allocated block | |
224 | * @out_bh: output of a pointer to the buffer_head | |
225 | * | |
226 | * nilfs_mdt_get_block() looks up the specified buffer and tries to create | |
227 | * a new buffer if @create is not zero. On success, the returned buffer is | |
228 | * assured to be either existing or formatted using a buffer lock on success. | |
229 | * @out_bh is substituted only when zero is returned. | |
230 | * | |
231 | * Return Value: On success, it returns 0. On error, the following negative | |
232 | * error code is returned. | |
233 | * | |
234 | * %-ENOMEM - Insufficient memory available. | |
235 | * | |
236 | * %-EIO - I/O error | |
237 | * | |
238 | * %-ENOENT - the specified block does not exist (hole block) | |
239 | * | |
5eb563f5 RK |
240 | * %-EROFS - Read only filesystem (for create mode) |
241 | */ | |
242 | int nilfs_mdt_get_block(struct inode *inode, unsigned long blkoff, int create, | |
243 | void (*init_block)(struct inode *, | |
244 | struct buffer_head *, void *), | |
245 | struct buffer_head **out_bh) | |
246 | { | |
247 | int ret; | |
248 | ||
249 | /* Should be rewritten with merging nilfs_mdt_read_block() */ | |
250 | retry: | |
b34a6506 | 251 | ret = nilfs_mdt_read_block(inode, blkoff, !create, out_bh); |
5eb563f5 RK |
252 | if (!create || ret != -ENOENT) |
253 | return ret; | |
254 | ||
255 | ret = nilfs_mdt_create_block(inode, blkoff, out_bh, init_block); | |
256 | if (unlikely(ret == -EEXIST)) { | |
257 | /* create = 0; */ /* limit read-create loop retries */ | |
258 | goto retry; | |
259 | } | |
260 | return ret; | |
261 | } | |
262 | ||
263 | /** | |
264 | * nilfs_mdt_delete_block - make a hole on the meta data file. | |
265 | * @inode: inode of the meta data file | |
266 | * @block: block offset | |
267 | * | |
268 | * Return Value: On success, zero is returned. | |
269 | * On error, one of the following negative error code is returned. | |
270 | * | |
271 | * %-ENOMEM - Insufficient memory available. | |
272 | * | |
273 | * %-EIO - I/O error | |
5eb563f5 RK |
274 | */ |
275 | int nilfs_mdt_delete_block(struct inode *inode, unsigned long block) | |
276 | { | |
277 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
278 | int err; | |
279 | ||
280 | err = nilfs_bmap_delete(ii->i_bmap, block); | |
84338237 | 281 | if (!err || err == -ENOENT) { |
5eb563f5 RK |
282 | nilfs_mdt_mark_dirty(inode); |
283 | nilfs_mdt_forget_block(inode, block); | |
284 | } | |
285 | return err; | |
286 | } | |
287 | ||
288 | /** | |
289 | * nilfs_mdt_forget_block - discard dirty state and try to remove the page | |
290 | * @inode: inode of the meta data file | |
291 | * @block: block offset | |
292 | * | |
293 | * nilfs_mdt_forget_block() clears a dirty flag of the specified buffer, and | |
294 | * tries to release the page including the buffer from a page cache. | |
295 | * | |
296 | * Return Value: On success, 0 is returned. On error, one of the following | |
297 | * negative error code is returned. | |
298 | * | |
299 | * %-EBUSY - page has an active buffer. | |
300 | * | |
301 | * %-ENOENT - page cache has no page addressed by the offset. | |
302 | */ | |
303 | int nilfs_mdt_forget_block(struct inode *inode, unsigned long block) | |
304 | { | |
305 | pgoff_t index = (pgoff_t)block >> | |
306 | (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
307 | struct page *page; | |
308 | unsigned long first_block; | |
309 | int ret = 0; | |
310 | int still_dirty; | |
311 | ||
312 | page = find_lock_page(inode->i_mapping, index); | |
313 | if (!page) | |
314 | return -ENOENT; | |
315 | ||
316 | wait_on_page_writeback(page); | |
317 | ||
318 | first_block = (unsigned long)index << | |
319 | (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
320 | if (page_has_buffers(page)) { | |
321 | struct buffer_head *bh; | |
322 | ||
323 | bh = nilfs_page_get_nth_block(page, block - first_block); | |
324 | nilfs_forget_buffer(bh); | |
325 | } | |
326 | still_dirty = PageDirty(page); | |
327 | unlock_page(page); | |
328 | page_cache_release(page); | |
329 | ||
330 | if (still_dirty || | |
331 | invalidate_inode_pages2_range(inode->i_mapping, index, index) != 0) | |
332 | ret = -EBUSY; | |
333 | return ret; | |
334 | } | |
335 | ||
336 | /** | |
337 | * nilfs_mdt_mark_block_dirty - mark a block on the meta data file dirty. | |
338 | * @inode: inode of the meta data file | |
339 | * @block: block offset | |
340 | * | |
341 | * Return Value: On success, it returns 0. On error, the following negative | |
342 | * error code is returned. | |
343 | * | |
344 | * %-ENOMEM - Insufficient memory available. | |
345 | * | |
346 | * %-EIO - I/O error | |
347 | * | |
348 | * %-ENOENT - the specified block does not exist (hole block) | |
5eb563f5 RK |
349 | */ |
350 | int nilfs_mdt_mark_block_dirty(struct inode *inode, unsigned long block) | |
351 | { | |
352 | struct buffer_head *bh; | |
353 | int err; | |
354 | ||
b34a6506 | 355 | err = nilfs_mdt_read_block(inode, block, 0, &bh); |
5eb563f5 RK |
356 | if (unlikely(err)) |
357 | return err; | |
5fc7b141 | 358 | mark_buffer_dirty(bh); |
5eb563f5 RK |
359 | nilfs_mdt_mark_dirty(inode); |
360 | brelse(bh); | |
361 | return 0; | |
362 | } | |
363 | ||
364 | int nilfs_mdt_fetch_dirty(struct inode *inode) | |
365 | { | |
366 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
367 | ||
368 | if (nilfs_bmap_test_and_clear_dirty(ii->i_bmap)) { | |
369 | set_bit(NILFS_I_DIRTY, &ii->i_state); | |
370 | return 1; | |
371 | } | |
372 | return test_bit(NILFS_I_DIRTY, &ii->i_state); | |
373 | } | |
374 | ||
375 | static int | |
376 | nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc) | |
377 | { | |
8c26c4e2 | 378 | struct inode *inode = page->mapping->host; |
ebdfed4d | 379 | struct super_block *sb; |
5eb563f5 RK |
380 | int err = 0; |
381 | ||
8c26c4e2 VD |
382 | if (inode && (inode->i_sb->s_flags & MS_RDONLY)) { |
383 | /* | |
384 | * It means that filesystem was remounted in read-only | |
385 | * mode because of error or metadata corruption. But we | |
386 | * have dirty pages that try to be flushed in background. | |
387 | * So, here we simply discard this dirty page. | |
388 | */ | |
389 | nilfs_clear_dirty_page(page, false); | |
390 | unlock_page(page); | |
391 | return -EROFS; | |
392 | } | |
393 | ||
5eb563f5 RK |
394 | redirty_page_for_writepage(wbc, page); |
395 | unlock_page(page); | |
396 | ||
ebdfed4d RK |
397 | if (!inode) |
398 | return 0; | |
399 | ||
400 | sb = inode->i_sb; | |
5eb563f5 RK |
401 | |
402 | if (wbc->sync_mode == WB_SYNC_ALL) | |
403 | err = nilfs_construct_segment(sb); | |
404 | else if (wbc->for_reclaim) | |
405 | nilfs_flush_segment(sb, inode->i_ino); | |
406 | ||
5eb563f5 RK |
407 | return err; |
408 | } | |
409 | ||
410 | ||
7f09410b | 411 | static const struct address_space_operations def_mdt_aops = { |
5eb563f5 RK |
412 | .writepage = nilfs_mdt_write_page, |
413 | }; | |
414 | ||
6e1d5dcc | 415 | static const struct inode_operations def_mdt_iops; |
828c0950 | 416 | static const struct file_operations def_mdt_fops; |
5eb563f5 | 417 | |
5e19a995 | 418 | |
f1e89c86 | 419 | int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz) |
5e19a995 RK |
420 | { |
421 | struct nilfs_mdt_info *mi; | |
422 | ||
423 | mi = kzalloc(max(sizeof(*mi), objsz), GFP_NOFS); | |
424 | if (!mi) | |
425 | return -ENOMEM; | |
426 | ||
5e19a995 RK |
427 | init_rwsem(&mi->mi_sem); |
428 | inode->i_private = mi; | |
429 | ||
430 | inode->i_mode = S_IFREG; | |
431 | mapping_set_gfp_mask(inode->i_mapping, gfp_mask); | |
f1e89c86 RK |
432 | |
433 | inode->i_op = &def_mdt_iops; | |
434 | inode->i_fop = &def_mdt_fops; | |
435 | inode->i_mapping->a_ops = &def_mdt_aops; | |
5e19a995 RK |
436 | |
437 | return 0; | |
438 | } | |
439 | ||
5eb563f5 RK |
440 | void nilfs_mdt_set_entry_size(struct inode *inode, unsigned entry_size, |
441 | unsigned header_size) | |
442 | { | |
443 | struct nilfs_mdt_info *mi = NILFS_MDT(inode); | |
444 | ||
445 | mi->mi_entry_size = entry_size; | |
446 | mi->mi_entries_per_block = (1 << inode->i_blkbits) / entry_size; | |
447 | mi->mi_first_entry_offset = DIV_ROUND_UP(header_size, entry_size); | |
448 | } | |
449 | ||
ebdfed4d RK |
450 | /** |
451 | * nilfs_mdt_setup_shadow_map - setup shadow map and bind it to metadata file | |
452 | * @inode: inode of the metadata file | |
453 | * @shadow: shadow mapping | |
454 | */ | |
455 | int nilfs_mdt_setup_shadow_map(struct inode *inode, | |
456 | struct nilfs_shadow_map *shadow) | |
457 | { | |
458 | struct nilfs_mdt_info *mi = NILFS_MDT(inode); | |
ebdfed4d RK |
459 | |
460 | INIT_LIST_HEAD(&shadow->frozen_buffers); | |
2aa15890 | 461 | address_space_init_once(&shadow->frozen_data); |
b83ae6d4 | 462 | nilfs_mapping_init(&shadow->frozen_data, inode); |
2aa15890 | 463 | address_space_init_once(&shadow->frozen_btnodes); |
b83ae6d4 | 464 | nilfs_mapping_init(&shadow->frozen_btnodes, inode); |
ebdfed4d RK |
465 | mi->mi_shadow = shadow; |
466 | return 0; | |
467 | } | |
468 | ||
469 | /** | |
470 | * nilfs_mdt_save_to_shadow_map - copy bmap and dirty pages to shadow map | |
471 | * @inode: inode of the metadata file | |
472 | */ | |
473 | int nilfs_mdt_save_to_shadow_map(struct inode *inode) | |
474 | { | |
475 | struct nilfs_mdt_info *mi = NILFS_MDT(inode); | |
476 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
477 | struct nilfs_shadow_map *shadow = mi->mi_shadow; | |
478 | int ret; | |
479 | ||
480 | ret = nilfs_copy_dirty_pages(&shadow->frozen_data, inode->i_mapping); | |
481 | if (ret) | |
482 | goto out; | |
483 | ||
484 | ret = nilfs_copy_dirty_pages(&shadow->frozen_btnodes, | |
485 | &ii->i_btnode_cache); | |
486 | if (ret) | |
487 | goto out; | |
488 | ||
489 | nilfs_bmap_save(ii->i_bmap, &shadow->bmap_store); | |
490 | out: | |
491 | return ret; | |
492 | } | |
493 | ||
b1f6a4f2 RK |
494 | int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh) |
495 | { | |
496 | struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow; | |
497 | struct buffer_head *bh_frozen; | |
498 | struct page *page; | |
499 | int blkbits = inode->i_blkbits; | |
b1f6a4f2 RK |
500 | |
501 | page = grab_cache_page(&shadow->frozen_data, bh->b_page->index); | |
502 | if (!page) | |
a7a8447e | 503 | return -ENOMEM; |
b1f6a4f2 RK |
504 | |
505 | if (!page_has_buffers(page)) | |
506 | create_empty_buffers(page, 1 << blkbits, 0); | |
507 | ||
508 | bh_frozen = nilfs_page_get_nth_block(page, bh_offset(bh) >> blkbits); | |
a7a8447e RK |
509 | |
510 | if (!buffer_uptodate(bh_frozen)) | |
511 | nilfs_copy_buffer(bh_frozen, bh); | |
512 | if (list_empty(&bh_frozen->b_assoc_buffers)) { | |
513 | list_add_tail(&bh_frozen->b_assoc_buffers, | |
514 | &shadow->frozen_buffers); | |
515 | set_buffer_nilfs_redirected(bh); | |
516 | } else { | |
517 | brelse(bh_frozen); /* already frozen */ | |
b1f6a4f2 | 518 | } |
a7a8447e | 519 | |
b1f6a4f2 RK |
520 | unlock_page(page); |
521 | page_cache_release(page); | |
a7a8447e | 522 | return 0; |
b1f6a4f2 RK |
523 | } |
524 | ||
525 | struct buffer_head * | |
526 | nilfs_mdt_get_frozen_buffer(struct inode *inode, struct buffer_head *bh) | |
527 | { | |
528 | struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow; | |
529 | struct buffer_head *bh_frozen = NULL; | |
530 | struct page *page; | |
531 | int n; | |
532 | ||
533 | page = find_lock_page(&shadow->frozen_data, bh->b_page->index); | |
534 | if (page) { | |
535 | if (page_has_buffers(page)) { | |
536 | n = bh_offset(bh) >> inode->i_blkbits; | |
537 | bh_frozen = nilfs_page_get_nth_block(page, n); | |
538 | } | |
539 | unlock_page(page); | |
540 | page_cache_release(page); | |
541 | } | |
542 | return bh_frozen; | |
543 | } | |
544 | ||
545 | static void nilfs_release_frozen_buffers(struct nilfs_shadow_map *shadow) | |
546 | { | |
547 | struct list_head *head = &shadow->frozen_buffers; | |
548 | struct buffer_head *bh; | |
549 | ||
550 | while (!list_empty(head)) { | |
551 | bh = list_first_entry(head, struct buffer_head, | |
552 | b_assoc_buffers); | |
553 | list_del_init(&bh->b_assoc_buffers); | |
554 | brelse(bh); /* drop ref-count to make it releasable */ | |
555 | } | |
556 | } | |
557 | ||
ebdfed4d RK |
558 | /** |
559 | * nilfs_mdt_restore_from_shadow_map - restore dirty pages and bmap state | |
560 | * @inode: inode of the metadata file | |
561 | */ | |
562 | void nilfs_mdt_restore_from_shadow_map(struct inode *inode) | |
563 | { | |
564 | struct nilfs_mdt_info *mi = NILFS_MDT(inode); | |
565 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
566 | struct nilfs_shadow_map *shadow = mi->mi_shadow; | |
567 | ||
568 | down_write(&mi->mi_sem); | |
569 | ||
570 | if (mi->mi_palloc_cache) | |
571 | nilfs_palloc_clear_cache(inode); | |
572 | ||
8c26c4e2 | 573 | nilfs_clear_dirty_pages(inode->i_mapping, true); |
ebdfed4d RK |
574 | nilfs_copy_back_pages(inode->i_mapping, &shadow->frozen_data); |
575 | ||
8c26c4e2 | 576 | nilfs_clear_dirty_pages(&ii->i_btnode_cache, true); |
ebdfed4d RK |
577 | nilfs_copy_back_pages(&ii->i_btnode_cache, &shadow->frozen_btnodes); |
578 | ||
579 | nilfs_bmap_restore(ii->i_bmap, &shadow->bmap_store); | |
580 | ||
581 | up_write(&mi->mi_sem); | |
582 | } | |
583 | ||
584 | /** | |
585 | * nilfs_mdt_clear_shadow_map - truncate pages in shadow map caches | |
586 | * @inode: inode of the metadata file | |
587 | */ | |
588 | void nilfs_mdt_clear_shadow_map(struct inode *inode) | |
589 | { | |
590 | struct nilfs_mdt_info *mi = NILFS_MDT(inode); | |
591 | struct nilfs_shadow_map *shadow = mi->mi_shadow; | |
592 | ||
593 | down_write(&mi->mi_sem); | |
b1f6a4f2 | 594 | nilfs_release_frozen_buffers(shadow); |
ebdfed4d RK |
595 | truncate_inode_pages(&shadow->frozen_data, 0); |
596 | truncate_inode_pages(&shadow->frozen_btnodes, 0); | |
597 | up_write(&mi->mi_sem); | |
598 | } |