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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 | ||
61 | kaddr = kmap_atomic(bh->b_page, KM_USER0); | |
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); | |
66 | kunmap_atomic(kaddr, KM_USER0); | |
67 | ||
68 | set_buffer_uptodate(bh); | |
69 | nilfs_mark_buffer_dirty(bh); | |
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 | * | |
240 | * %-EINVAL - bmap is broken. (the caller should call nilfs_error()) | |
241 | * | |
242 | * %-EROFS - Read only filesystem (for create mode) | |
243 | */ | |
244 | int nilfs_mdt_get_block(struct inode *inode, unsigned long blkoff, int create, | |
245 | void (*init_block)(struct inode *, | |
246 | struct buffer_head *, void *), | |
247 | struct buffer_head **out_bh) | |
248 | { | |
249 | int ret; | |
250 | ||
251 | /* Should be rewritten with merging nilfs_mdt_read_block() */ | |
252 | retry: | |
b34a6506 | 253 | ret = nilfs_mdt_read_block(inode, blkoff, !create, out_bh); |
5eb563f5 RK |
254 | if (!create || ret != -ENOENT) |
255 | return ret; | |
256 | ||
257 | ret = nilfs_mdt_create_block(inode, blkoff, out_bh, init_block); | |
258 | if (unlikely(ret == -EEXIST)) { | |
259 | /* create = 0; */ /* limit read-create loop retries */ | |
260 | goto retry; | |
261 | } | |
262 | return ret; | |
263 | } | |
264 | ||
265 | /** | |
266 | * nilfs_mdt_delete_block - make a hole on the meta data file. | |
267 | * @inode: inode of the meta data file | |
268 | * @block: block offset | |
269 | * | |
270 | * Return Value: On success, zero is returned. | |
271 | * On error, one of the following negative error code is returned. | |
272 | * | |
273 | * %-ENOMEM - Insufficient memory available. | |
274 | * | |
275 | * %-EIO - I/O error | |
276 | * | |
277 | * %-EINVAL - bmap is broken. (the caller should call nilfs_error()) | |
278 | */ | |
279 | int nilfs_mdt_delete_block(struct inode *inode, unsigned long block) | |
280 | { | |
281 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
282 | int err; | |
283 | ||
284 | err = nilfs_bmap_delete(ii->i_bmap, block); | |
84338237 | 285 | if (!err || err == -ENOENT) { |
5eb563f5 RK |
286 | nilfs_mdt_mark_dirty(inode); |
287 | nilfs_mdt_forget_block(inode, block); | |
288 | } | |
289 | return err; | |
290 | } | |
291 | ||
292 | /** | |
293 | * nilfs_mdt_forget_block - discard dirty state and try to remove the page | |
294 | * @inode: inode of the meta data file | |
295 | * @block: block offset | |
296 | * | |
297 | * nilfs_mdt_forget_block() clears a dirty flag of the specified buffer, and | |
298 | * tries to release the page including the buffer from a page cache. | |
299 | * | |
300 | * Return Value: On success, 0 is returned. On error, one of the following | |
301 | * negative error code is returned. | |
302 | * | |
303 | * %-EBUSY - page has an active buffer. | |
304 | * | |
305 | * %-ENOENT - page cache has no page addressed by the offset. | |
306 | */ | |
307 | int nilfs_mdt_forget_block(struct inode *inode, unsigned long block) | |
308 | { | |
309 | pgoff_t index = (pgoff_t)block >> | |
310 | (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
311 | struct page *page; | |
312 | unsigned long first_block; | |
313 | int ret = 0; | |
314 | int still_dirty; | |
315 | ||
316 | page = find_lock_page(inode->i_mapping, index); | |
317 | if (!page) | |
318 | return -ENOENT; | |
319 | ||
320 | wait_on_page_writeback(page); | |
321 | ||
322 | first_block = (unsigned long)index << | |
323 | (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
324 | if (page_has_buffers(page)) { | |
325 | struct buffer_head *bh; | |
326 | ||
327 | bh = nilfs_page_get_nth_block(page, block - first_block); | |
328 | nilfs_forget_buffer(bh); | |
329 | } | |
330 | still_dirty = PageDirty(page); | |
331 | unlock_page(page); | |
332 | page_cache_release(page); | |
333 | ||
334 | if (still_dirty || | |
335 | invalidate_inode_pages2_range(inode->i_mapping, index, index) != 0) | |
336 | ret = -EBUSY; | |
337 | return ret; | |
338 | } | |
339 | ||
340 | /** | |
341 | * nilfs_mdt_mark_block_dirty - mark a block on the meta data file dirty. | |
342 | * @inode: inode of the meta data file | |
343 | * @block: block offset | |
344 | * | |
345 | * Return Value: On success, it returns 0. On error, the following negative | |
346 | * error code is returned. | |
347 | * | |
348 | * %-ENOMEM - Insufficient memory available. | |
349 | * | |
350 | * %-EIO - I/O error | |
351 | * | |
352 | * %-ENOENT - the specified block does not exist (hole block) | |
353 | * | |
354 | * %-EINVAL - bmap is broken. (the caller should call nilfs_error()) | |
355 | */ | |
356 | int nilfs_mdt_mark_block_dirty(struct inode *inode, unsigned long block) | |
357 | { | |
358 | struct buffer_head *bh; | |
359 | int err; | |
360 | ||
b34a6506 | 361 | err = nilfs_mdt_read_block(inode, block, 0, &bh); |
5eb563f5 RK |
362 | if (unlikely(err)) |
363 | return err; | |
364 | nilfs_mark_buffer_dirty(bh); | |
365 | nilfs_mdt_mark_dirty(inode); | |
366 | brelse(bh); | |
367 | return 0; | |
368 | } | |
369 | ||
370 | int nilfs_mdt_fetch_dirty(struct inode *inode) | |
371 | { | |
372 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
373 | ||
374 | if (nilfs_bmap_test_and_clear_dirty(ii->i_bmap)) { | |
375 | set_bit(NILFS_I_DIRTY, &ii->i_state); | |
376 | return 1; | |
377 | } | |
378 | return test_bit(NILFS_I_DIRTY, &ii->i_state); | |
379 | } | |
380 | ||
381 | static int | |
382 | nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc) | |
383 | { | |
ebdfed4d RK |
384 | struct inode *inode; |
385 | struct super_block *sb; | |
5eb563f5 RK |
386 | int err = 0; |
387 | ||
388 | redirty_page_for_writepage(wbc, page); | |
389 | unlock_page(page); | |
390 | ||
ebdfed4d RK |
391 | inode = page->mapping->host; |
392 | if (!inode) | |
393 | return 0; | |
394 | ||
395 | sb = inode->i_sb; | |
5eb563f5 RK |
396 | |
397 | if (wbc->sync_mode == WB_SYNC_ALL) | |
398 | err = nilfs_construct_segment(sb); | |
399 | else if (wbc->for_reclaim) | |
400 | nilfs_flush_segment(sb, inode->i_ino); | |
401 | ||
5eb563f5 RK |
402 | return err; |
403 | } | |
404 | ||
405 | ||
7f09410b | 406 | static const struct address_space_operations def_mdt_aops = { |
5eb563f5 | 407 | .writepage = nilfs_mdt_write_page, |
fa032744 | 408 | .sync_page = block_sync_page, |
5eb563f5 RK |
409 | }; |
410 | ||
6e1d5dcc | 411 | static const struct inode_operations def_mdt_iops; |
828c0950 | 412 | static const struct file_operations def_mdt_fops; |
5eb563f5 | 413 | |
5e19a995 | 414 | |
f1e89c86 | 415 | int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz) |
5e19a995 RK |
416 | { |
417 | struct nilfs_mdt_info *mi; | |
418 | ||
419 | mi = kzalloc(max(sizeof(*mi), objsz), GFP_NOFS); | |
420 | if (!mi) | |
421 | return -ENOMEM; | |
422 | ||
5e19a995 RK |
423 | init_rwsem(&mi->mi_sem); |
424 | inode->i_private = mi; | |
425 | ||
426 | inode->i_mode = S_IFREG; | |
427 | mapping_set_gfp_mask(inode->i_mapping, gfp_mask); | |
f1e89c86 RK |
428 | inode->i_mapping->backing_dev_info = inode->i_sb->s_bdi; |
429 | ||
430 | inode->i_op = &def_mdt_iops; | |
431 | inode->i_fop = &def_mdt_fops; | |
432 | inode->i_mapping->a_ops = &def_mdt_aops; | |
5e19a995 RK |
433 | |
434 | return 0; | |
435 | } | |
436 | ||
5eb563f5 RK |
437 | void nilfs_mdt_set_entry_size(struct inode *inode, unsigned entry_size, |
438 | unsigned header_size) | |
439 | { | |
440 | struct nilfs_mdt_info *mi = NILFS_MDT(inode); | |
441 | ||
442 | mi->mi_entry_size = entry_size; | |
443 | mi->mi_entries_per_block = (1 << inode->i_blkbits) / entry_size; | |
444 | mi->mi_first_entry_offset = DIV_ROUND_UP(header_size, entry_size); | |
445 | } | |
446 | ||
ebdfed4d RK |
447 | static const struct address_space_operations shadow_map_aops = { |
448 | .sync_page = block_sync_page, | |
449 | }; | |
450 | ||
451 | /** | |
452 | * nilfs_mdt_setup_shadow_map - setup shadow map and bind it to metadata file | |
453 | * @inode: inode of the metadata file | |
454 | * @shadow: shadow mapping | |
455 | */ | |
456 | int nilfs_mdt_setup_shadow_map(struct inode *inode, | |
457 | struct nilfs_shadow_map *shadow) | |
458 | { | |
459 | struct nilfs_mdt_info *mi = NILFS_MDT(inode); | |
026a7d63 | 460 | struct backing_dev_info *bdi = inode->i_sb->s_bdi; |
ebdfed4d RK |
461 | |
462 | INIT_LIST_HEAD(&shadow->frozen_buffers); | |
463 | nilfs_mapping_init_once(&shadow->frozen_data); | |
464 | nilfs_mapping_init(&shadow->frozen_data, bdi, &shadow_map_aops); | |
465 | nilfs_mapping_init_once(&shadow->frozen_btnodes); | |
466 | nilfs_mapping_init(&shadow->frozen_btnodes, bdi, &shadow_map_aops); | |
467 | mi->mi_shadow = shadow; | |
468 | return 0; | |
469 | } | |
470 | ||
471 | /** | |
472 | * nilfs_mdt_save_to_shadow_map - copy bmap and dirty pages to shadow map | |
473 | * @inode: inode of the metadata file | |
474 | */ | |
475 | int nilfs_mdt_save_to_shadow_map(struct inode *inode) | |
476 | { | |
477 | struct nilfs_mdt_info *mi = NILFS_MDT(inode); | |
478 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
479 | struct nilfs_shadow_map *shadow = mi->mi_shadow; | |
480 | int ret; | |
481 | ||
482 | ret = nilfs_copy_dirty_pages(&shadow->frozen_data, inode->i_mapping); | |
483 | if (ret) | |
484 | goto out; | |
485 | ||
486 | ret = nilfs_copy_dirty_pages(&shadow->frozen_btnodes, | |
487 | &ii->i_btnode_cache); | |
488 | if (ret) | |
489 | goto out; | |
490 | ||
491 | nilfs_bmap_save(ii->i_bmap, &shadow->bmap_store); | |
492 | out: | |
493 | return ret; | |
494 | } | |
495 | ||
b1f6a4f2 RK |
496 | int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh) |
497 | { | |
498 | struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow; | |
499 | struct buffer_head *bh_frozen; | |
500 | struct page *page; | |
501 | int blkbits = inode->i_blkbits; | |
502 | int ret = -ENOMEM; | |
503 | ||
504 | page = grab_cache_page(&shadow->frozen_data, bh->b_page->index); | |
505 | if (!page) | |
506 | return ret; | |
507 | ||
508 | if (!page_has_buffers(page)) | |
509 | create_empty_buffers(page, 1 << blkbits, 0); | |
510 | ||
511 | bh_frozen = nilfs_page_get_nth_block(page, bh_offset(bh) >> blkbits); | |
512 | if (bh_frozen) { | |
513 | if (!buffer_uptodate(bh_frozen)) | |
514 | nilfs_copy_buffer(bh_frozen, bh); | |
515 | if (list_empty(&bh_frozen->b_assoc_buffers)) { | |
516 | list_add_tail(&bh_frozen->b_assoc_buffers, | |
517 | &shadow->frozen_buffers); | |
518 | set_buffer_nilfs_redirected(bh); | |
519 | } else { | |
520 | brelse(bh_frozen); /* already frozen */ | |
521 | } | |
522 | ret = 0; | |
523 | } | |
524 | unlock_page(page); | |
525 | page_cache_release(page); | |
526 | return ret; | |
527 | } | |
528 | ||
529 | struct buffer_head * | |
530 | nilfs_mdt_get_frozen_buffer(struct inode *inode, struct buffer_head *bh) | |
531 | { | |
532 | struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow; | |
533 | struct buffer_head *bh_frozen = NULL; | |
534 | struct page *page; | |
535 | int n; | |
536 | ||
537 | page = find_lock_page(&shadow->frozen_data, bh->b_page->index); | |
538 | if (page) { | |
539 | if (page_has_buffers(page)) { | |
540 | n = bh_offset(bh) >> inode->i_blkbits; | |
541 | bh_frozen = nilfs_page_get_nth_block(page, n); | |
542 | } | |
543 | unlock_page(page); | |
544 | page_cache_release(page); | |
545 | } | |
546 | return bh_frozen; | |
547 | } | |
548 | ||
549 | static void nilfs_release_frozen_buffers(struct nilfs_shadow_map *shadow) | |
550 | { | |
551 | struct list_head *head = &shadow->frozen_buffers; | |
552 | struct buffer_head *bh; | |
553 | ||
554 | while (!list_empty(head)) { | |
555 | bh = list_first_entry(head, struct buffer_head, | |
556 | b_assoc_buffers); | |
557 | list_del_init(&bh->b_assoc_buffers); | |
558 | brelse(bh); /* drop ref-count to make it releasable */ | |
559 | } | |
560 | } | |
561 | ||
ebdfed4d RK |
562 | /** |
563 | * nilfs_mdt_restore_from_shadow_map - restore dirty pages and bmap state | |
564 | * @inode: inode of the metadata file | |
565 | */ | |
566 | void nilfs_mdt_restore_from_shadow_map(struct inode *inode) | |
567 | { | |
568 | struct nilfs_mdt_info *mi = NILFS_MDT(inode); | |
569 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
570 | struct nilfs_shadow_map *shadow = mi->mi_shadow; | |
571 | ||
572 | down_write(&mi->mi_sem); | |
573 | ||
574 | if (mi->mi_palloc_cache) | |
575 | nilfs_palloc_clear_cache(inode); | |
576 | ||
577 | nilfs_clear_dirty_pages(inode->i_mapping); | |
578 | nilfs_copy_back_pages(inode->i_mapping, &shadow->frozen_data); | |
579 | ||
580 | nilfs_clear_dirty_pages(&ii->i_btnode_cache); | |
581 | nilfs_copy_back_pages(&ii->i_btnode_cache, &shadow->frozen_btnodes); | |
582 | ||
583 | nilfs_bmap_restore(ii->i_bmap, &shadow->bmap_store); | |
584 | ||
585 | up_write(&mi->mi_sem); | |
586 | } | |
587 | ||
588 | /** | |
589 | * nilfs_mdt_clear_shadow_map - truncate pages in shadow map caches | |
590 | * @inode: inode of the metadata file | |
591 | */ | |
592 | void nilfs_mdt_clear_shadow_map(struct inode *inode) | |
593 | { | |
594 | struct nilfs_mdt_info *mi = NILFS_MDT(inode); | |
595 | struct nilfs_shadow_map *shadow = mi->mi_shadow; | |
596 | ||
597 | down_write(&mi->mi_sem); | |
b1f6a4f2 | 598 | nilfs_release_frozen_buffers(shadow); |
ebdfed4d RK |
599 | truncate_inode_pages(&shadow->frozen_data, 0); |
600 | truncate_inode_pages(&shadow->frozen_btnodes, 0); | |
601 | up_write(&mi->mi_sem); | |
602 | } |