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ae98043f | 1 | // SPDX-License-Identifier: GPL-2.0+ |
5eb563f5 | 2 | /* |
94ee1d91 | 3 | * Meta data file for NILFS |
5eb563f5 RK |
4 | * |
5 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. | |
6 | * | |
4b420ab4 | 7 | * Written by Ryusuke Konishi. |
5eb563f5 RK |
8 | */ |
9 | ||
10 | #include <linux/buffer_head.h> | |
11 | #include <linux/mpage.h> | |
12 | #include <linux/mm.h> | |
13 | #include <linux/writeback.h> | |
14 | #include <linux/backing-dev.h> | |
15 | #include <linux/swap.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
5eb563f5 | 17 | #include "nilfs.h" |
05d0e94b | 18 | #include "btnode.h" |
5eb563f5 RK |
19 | #include "segment.h" |
20 | #include "page.h" | |
21 | #include "mdt.h" | |
2d19961d | 22 | #include "alloc.h" /* nilfs_palloc_destroy_cache() */ |
5eb563f5 | 23 | |
a9cd207c | 24 | #include <trace/events/nilfs2.h> |
5eb563f5 RK |
25 | |
26 | #define NILFS_MDT_MAX_RA_BLOCKS (16 - 1) | |
27 | ||
5eb563f5 RK |
28 | |
29 | static int | |
30 | nilfs_mdt_insert_new_block(struct inode *inode, unsigned long block, | |
31 | struct buffer_head *bh, | |
32 | void (*init_block)(struct inode *, | |
33 | struct buffer_head *, void *)) | |
34 | { | |
35 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
36 | void *kaddr; | |
37 | int ret; | |
38 | ||
39 | /* Caller exclude read accesses using page lock */ | |
40 | ||
41 | /* set_buffer_new(bh); */ | |
42 | bh->b_blocknr = 0; | |
43 | ||
44 | ret = nilfs_bmap_insert(ii->i_bmap, block, (unsigned long)bh); | |
45 | if (unlikely(ret)) | |
46 | return ret; | |
47 | ||
48 | set_buffer_mapped(bh); | |
49 | ||
7b9c0976 | 50 | kaddr = kmap_atomic(bh->b_page); |
93407472 | 51 | memset(kaddr + bh_offset(bh), 0, i_blocksize(inode)); |
5eb563f5 RK |
52 | if (init_block) |
53 | init_block(inode, bh, kaddr); | |
54 | flush_dcache_page(bh->b_page); | |
7b9c0976 | 55 | kunmap_atomic(kaddr); |
5eb563f5 RK |
56 | |
57 | set_buffer_uptodate(bh); | |
5fc7b141 | 58 | mark_buffer_dirty(bh); |
5eb563f5 | 59 | nilfs_mdt_mark_dirty(inode); |
a9cd207c HM |
60 | |
61 | trace_nilfs2_mdt_insert_new_block(inode, inode->i_ino, block); | |
62 | ||
5eb563f5 RK |
63 | return 0; |
64 | } | |
65 | ||
66 | static int nilfs_mdt_create_block(struct inode *inode, unsigned long block, | |
67 | struct buffer_head **out_bh, | |
68 | void (*init_block)(struct inode *, | |
69 | struct buffer_head *, | |
70 | void *)) | |
71 | { | |
5eb563f5 RK |
72 | struct super_block *sb = inode->i_sb; |
73 | struct nilfs_transaction_info ti; | |
74 | struct buffer_head *bh; | |
75 | int err; | |
76 | ||
5eb563f5 RK |
77 | nilfs_transaction_begin(sb, &ti, 0); |
78 | ||
79 | err = -ENOMEM; | |
80 | bh = nilfs_grab_buffer(inode, inode->i_mapping, block, 0); | |
81 | if (unlikely(!bh)) | |
82 | goto failed_unlock; | |
83 | ||
84 | err = -EEXIST; | |
14351104 | 85 | if (buffer_uptodate(bh)) |
5eb563f5 | 86 | goto failed_bh; |
14351104 | 87 | |
5eb563f5 RK |
88 | wait_on_buffer(bh); |
89 | if (buffer_uptodate(bh)) | |
90 | goto failed_bh; | |
5eb563f5 | 91 | |
090fd5b1 | 92 | bh->b_bdev = sb->s_bdev; |
5eb563f5 RK |
93 | err = nilfs_mdt_insert_new_block(inode, block, bh, init_block); |
94 | if (likely(!err)) { | |
95 | get_bh(bh); | |
96 | *out_bh = bh; | |
97 | } | |
98 | ||
99 | failed_bh: | |
100 | unlock_page(bh->b_page); | |
09cbfeaf | 101 | put_page(bh->b_page); |
5eb563f5 RK |
102 | brelse(bh); |
103 | ||
104 | failed_unlock: | |
47420c79 RK |
105 | if (likely(!err)) |
106 | err = nilfs_transaction_commit(sb); | |
107 | else | |
108 | nilfs_transaction_abort(sb); | |
090fd5b1 | 109 | |
5eb563f5 RK |
110 | return err; |
111 | } | |
112 | ||
113 | static int | |
ed451259 BVA |
114 | nilfs_mdt_submit_block(struct inode *inode, unsigned long blkoff, blk_opf_t opf, |
115 | struct buffer_head **out_bh) | |
5eb563f5 RK |
116 | { |
117 | struct buffer_head *bh; | |
0f3fe33b | 118 | __u64 blknum = 0; |
5eb563f5 RK |
119 | int ret = -ENOMEM; |
120 | ||
121 | bh = nilfs_grab_buffer(inode, inode->i_mapping, blkoff, 0); | |
122 | if (unlikely(!bh)) | |
123 | goto failed; | |
124 | ||
125 | ret = -EEXIST; /* internal code */ | |
126 | if (buffer_uptodate(bh)) | |
127 | goto out; | |
128 | ||
ed451259 | 129 | if (opf & REQ_RAHEAD) { |
5eb563f5 RK |
130 | if (!trylock_buffer(bh)) { |
131 | ret = -EBUSY; | |
132 | goto failed_bh; | |
133 | } | |
ed451259 | 134 | } else /* opf == REQ_OP_READ */ |
5eb563f5 | 135 | lock_buffer(bh); |
5eb563f5 RK |
136 | |
137 | if (buffer_uptodate(bh)) { | |
138 | unlock_buffer(bh); | |
139 | goto out; | |
140 | } | |
14351104 RK |
141 | |
142 | ret = nilfs_bmap_lookup(NILFS_I(inode)->i_bmap, blkoff, &blknum); | |
143 | if (unlikely(ret)) { | |
144 | unlock_buffer(bh); | |
145 | goto failed_bh; | |
5eb563f5 | 146 | } |
c6e07188 | 147 | map_bh(bh, inode->i_sb, (sector_t)blknum); |
5eb563f5 RK |
148 | |
149 | bh->b_end_io = end_buffer_read_sync; | |
150 | get_bh(bh); | |
ed451259 | 151 | submit_bh(opf, bh); |
5eb563f5 | 152 | ret = 0; |
a9cd207c | 153 | |
ed451259 BVA |
154 | trace_nilfs2_mdt_submit_block(inode, inode->i_ino, blkoff, |
155 | opf & REQ_OP_MASK); | |
5eb563f5 RK |
156 | out: |
157 | get_bh(bh); | |
158 | *out_bh = bh; | |
159 | ||
160 | failed_bh: | |
161 | unlock_page(bh->b_page); | |
09cbfeaf | 162 | put_page(bh->b_page); |
5eb563f5 RK |
163 | brelse(bh); |
164 | failed: | |
165 | return ret; | |
166 | } | |
167 | ||
168 | static int nilfs_mdt_read_block(struct inode *inode, unsigned long block, | |
b34a6506 | 169 | int readahead, struct buffer_head **out_bh) |
5eb563f5 RK |
170 | { |
171 | struct buffer_head *first_bh, *bh; | |
172 | unsigned long blkoff; | |
173 | int i, nr_ra_blocks = NILFS_MDT_MAX_RA_BLOCKS; | |
174 | int err; | |
175 | ||
ed451259 | 176 | err = nilfs_mdt_submit_block(inode, block, REQ_OP_READ, &first_bh); |
5eb563f5 RK |
177 | if (err == -EEXIST) /* internal code */ |
178 | goto out; | |
179 | ||
180 | if (unlikely(err)) | |
181 | goto failed; | |
182 | ||
b34a6506 RK |
183 | if (readahead) { |
184 | blkoff = block + 1; | |
185 | for (i = 0; i < nr_ra_blocks; i++, blkoff++) { | |
ed451259 BVA |
186 | err = nilfs_mdt_submit_block(inode, blkoff, |
187 | REQ_OP_READ | REQ_RAHEAD, &bh); | |
b34a6506 RK |
188 | if (likely(!err || err == -EEXIST)) |
189 | brelse(bh); | |
190 | else if (err != -EBUSY) | |
191 | break; | |
192 | /* abort readahead if bmap lookup failed */ | |
193 | if (!buffer_locked(first_bh)) | |
194 | goto out_no_wait; | |
195 | } | |
5eb563f5 RK |
196 | } |
197 | ||
198 | wait_on_buffer(first_bh); | |
199 | ||
200 | out_no_wait: | |
201 | err = -EIO; | |
39a9dcca | 202 | if (!buffer_uptodate(first_bh)) { |
a1d0747a | 203 | nilfs_err(inode->i_sb, |
39a9dcca RK |
204 | "I/O error reading meta-data file (ino=%lu, block-offset=%lu)", |
205 | inode->i_ino, block); | |
5eb563f5 | 206 | goto failed_bh; |
39a9dcca | 207 | } |
5eb563f5 RK |
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 | ||
fa33915c RK |
263 | /** |
264 | * nilfs_mdt_find_block - find and get a buffer on meta data file. | |
265 | * @inode: inode of the meta data file | |
266 | * @start: start block offset (inclusive) | |
267 | * @end: end block offset (inclusive) | |
268 | * @blkoff: block offset | |
269 | * @out_bh: place to store a pointer to buffer_head struct | |
270 | * | |
271 | * nilfs_mdt_find_block() looks up an existing block in range of | |
272 | * [@start, @end] and stores pointer to a buffer head of the block to | |
273 | * @out_bh, and block offset to @blkoff, respectively. @out_bh and | |
274 | * @blkoff are substituted only when zero is returned. | |
275 | * | |
276 | * Return Value: On success, it returns 0. On error, the following negative | |
277 | * error code is returned. | |
278 | * | |
279 | * %-ENOMEM - Insufficient memory available. | |
280 | * | |
281 | * %-EIO - I/O error | |
282 | * | |
283 | * %-ENOENT - no block was found in the range | |
284 | */ | |
285 | int nilfs_mdt_find_block(struct inode *inode, unsigned long start, | |
286 | unsigned long end, unsigned long *blkoff, | |
287 | struct buffer_head **out_bh) | |
288 | { | |
289 | __u64 next; | |
290 | int ret; | |
291 | ||
292 | if (unlikely(start > end)) | |
293 | return -ENOENT; | |
294 | ||
295 | ret = nilfs_mdt_read_block(inode, start, true, out_bh); | |
296 | if (!ret) { | |
297 | *blkoff = start; | |
298 | goto out; | |
299 | } | |
300 | if (unlikely(ret != -ENOENT || start == ULONG_MAX)) | |
301 | goto out; | |
302 | ||
303 | ret = nilfs_bmap_seek_key(NILFS_I(inode)->i_bmap, start + 1, &next); | |
304 | if (!ret) { | |
305 | if (next <= end) { | |
306 | ret = nilfs_mdt_read_block(inode, next, true, out_bh); | |
307 | if (!ret) | |
308 | *blkoff = next; | |
309 | } else { | |
310 | ret = -ENOENT; | |
311 | } | |
312 | } | |
313 | out: | |
314 | return ret; | |
315 | } | |
316 | ||
5eb563f5 RK |
317 | /** |
318 | * nilfs_mdt_delete_block - make a hole on the meta data file. | |
319 | * @inode: inode of the meta data file | |
320 | * @block: block offset | |
321 | * | |
322 | * Return Value: On success, zero is returned. | |
323 | * On error, one of the following negative error code is returned. | |
324 | * | |
325 | * %-ENOMEM - Insufficient memory available. | |
326 | * | |
327 | * %-EIO - I/O error | |
5eb563f5 RK |
328 | */ |
329 | int nilfs_mdt_delete_block(struct inode *inode, unsigned long block) | |
330 | { | |
331 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
332 | int err; | |
333 | ||
334 | err = nilfs_bmap_delete(ii->i_bmap, block); | |
84338237 | 335 | if (!err || err == -ENOENT) { |
5eb563f5 RK |
336 | nilfs_mdt_mark_dirty(inode); |
337 | nilfs_mdt_forget_block(inode, block); | |
338 | } | |
339 | return err; | |
340 | } | |
341 | ||
342 | /** | |
343 | * nilfs_mdt_forget_block - discard dirty state and try to remove the page | |
344 | * @inode: inode of the meta data file | |
345 | * @block: block offset | |
346 | * | |
347 | * nilfs_mdt_forget_block() clears a dirty flag of the specified buffer, and | |
348 | * tries to release the page including the buffer from a page cache. | |
349 | * | |
350 | * Return Value: On success, 0 is returned. On error, one of the following | |
351 | * negative error code is returned. | |
352 | * | |
353 | * %-EBUSY - page has an active buffer. | |
354 | * | |
355 | * %-ENOENT - page cache has no page addressed by the offset. | |
356 | */ | |
357 | int nilfs_mdt_forget_block(struct inode *inode, unsigned long block) | |
358 | { | |
359 | pgoff_t index = (pgoff_t)block >> | |
09cbfeaf | 360 | (PAGE_SHIFT - inode->i_blkbits); |
5eb563f5 RK |
361 | struct page *page; |
362 | unsigned long first_block; | |
363 | int ret = 0; | |
364 | int still_dirty; | |
365 | ||
366 | page = find_lock_page(inode->i_mapping, index); | |
367 | if (!page) | |
368 | return -ENOENT; | |
369 | ||
370 | wait_on_page_writeback(page); | |
371 | ||
372 | first_block = (unsigned long)index << | |
09cbfeaf | 373 | (PAGE_SHIFT - inode->i_blkbits); |
5eb563f5 RK |
374 | if (page_has_buffers(page)) { |
375 | struct buffer_head *bh; | |
376 | ||
377 | bh = nilfs_page_get_nth_block(page, block - first_block); | |
378 | nilfs_forget_buffer(bh); | |
379 | } | |
380 | still_dirty = PageDirty(page); | |
381 | unlock_page(page); | |
09cbfeaf | 382 | put_page(page); |
5eb563f5 RK |
383 | |
384 | if (still_dirty || | |
385 | invalidate_inode_pages2_range(inode->i_mapping, index, index) != 0) | |
386 | ret = -EBUSY; | |
387 | return ret; | |
388 | } | |
389 | ||
5eb563f5 RK |
390 | int nilfs_mdt_fetch_dirty(struct inode *inode) |
391 | { | |
392 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
393 | ||
394 | if (nilfs_bmap_test_and_clear_dirty(ii->i_bmap)) { | |
395 | set_bit(NILFS_I_DIRTY, &ii->i_state); | |
396 | return 1; | |
397 | } | |
398 | return test_bit(NILFS_I_DIRTY, &ii->i_state); | |
399 | } | |
400 | ||
401 | static int | |
402 | nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc) | |
403 | { | |
8c26c4e2 | 404 | struct inode *inode = page->mapping->host; |
ebdfed4d | 405 | struct super_block *sb; |
5eb563f5 RK |
406 | int err = 0; |
407 | ||
bc98a42c | 408 | if (inode && sb_rdonly(inode->i_sb)) { |
8c26c4e2 VD |
409 | /* |
410 | * It means that filesystem was remounted in read-only | |
411 | * mode because of error or metadata corruption. But we | |
412 | * have dirty pages that try to be flushed in background. | |
413 | * So, here we simply discard this dirty page. | |
414 | */ | |
415 | nilfs_clear_dirty_page(page, false); | |
416 | unlock_page(page); | |
417 | return -EROFS; | |
418 | } | |
419 | ||
5eb563f5 RK |
420 | redirty_page_for_writepage(wbc, page); |
421 | unlock_page(page); | |
422 | ||
ebdfed4d RK |
423 | if (!inode) |
424 | return 0; | |
425 | ||
426 | sb = inode->i_sb; | |
5eb563f5 RK |
427 | |
428 | if (wbc->sync_mode == WB_SYNC_ALL) | |
429 | err = nilfs_construct_segment(sb); | |
430 | else if (wbc->for_reclaim) | |
431 | nilfs_flush_segment(sb, inode->i_ino); | |
432 | ||
5eb563f5 RK |
433 | return err; |
434 | } | |
435 | ||
436 | ||
7f09410b | 437 | static const struct address_space_operations def_mdt_aops = { |
e621900a MWO |
438 | .dirty_folio = block_dirty_folio, |
439 | .invalidate_folio = block_invalidate_folio, | |
5eb563f5 RK |
440 | .writepage = nilfs_mdt_write_page, |
441 | }; | |
442 | ||
6e1d5dcc | 443 | static const struct inode_operations def_mdt_iops; |
828c0950 | 444 | static const struct file_operations def_mdt_fops; |
5eb563f5 | 445 | |
5e19a995 | 446 | |
f1e89c86 | 447 | int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz) |
5e19a995 RK |
448 | { |
449 | struct nilfs_mdt_info *mi; | |
450 | ||
451 | mi = kzalloc(max(sizeof(*mi), objsz), GFP_NOFS); | |
452 | if (!mi) | |
453 | return -ENOMEM; | |
454 | ||
5e19a995 RK |
455 | init_rwsem(&mi->mi_sem); |
456 | inode->i_private = mi; | |
457 | ||
458 | inode->i_mode = S_IFREG; | |
459 | mapping_set_gfp_mask(inode->i_mapping, gfp_mask); | |
f1e89c86 RK |
460 | |
461 | inode->i_op = &def_mdt_iops; | |
462 | inode->i_fop = &def_mdt_fops; | |
463 | inode->i_mapping->a_ops = &def_mdt_aops; | |
5e19a995 RK |
464 | |
465 | return 0; | |
466 | } | |
467 | ||
2d19961d RK |
468 | /** |
469 | * nilfs_mdt_clear - do cleanup for the metadata file | |
470 | * @inode: inode of the metadata file | |
471 | */ | |
472 | void nilfs_mdt_clear(struct inode *inode) | |
473 | { | |
474 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); | |
6e211930 | 475 | struct nilfs_shadow_map *shadow = mdi->mi_shadow; |
2d19961d RK |
476 | |
477 | if (mdi->mi_palloc_cache) | |
478 | nilfs_palloc_destroy_cache(inode); | |
6e211930 RK |
479 | |
480 | if (shadow) { | |
481 | struct inode *s_inode = shadow->inode; | |
482 | ||
483 | shadow->inode = NULL; | |
484 | iput(s_inode); | |
485 | mdi->mi_shadow = NULL; | |
486 | } | |
2d19961d RK |
487 | } |
488 | ||
489 | /** | |
490 | * nilfs_mdt_destroy - release resources used by the metadata file | |
491 | * @inode: inode of the metadata file | |
492 | */ | |
493 | void nilfs_mdt_destroy(struct inode *inode) | |
494 | { | |
495 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); | |
496 | ||
497 | kfree(mdi->mi_bgl); /* kfree(NULL) is safe */ | |
498 | kfree(mdi); | |
499 | } | |
500 | ||
0c6c44cb RK |
501 | void nilfs_mdt_set_entry_size(struct inode *inode, unsigned int entry_size, |
502 | unsigned int header_size) | |
5eb563f5 RK |
503 | { |
504 | struct nilfs_mdt_info *mi = NILFS_MDT(inode); | |
505 | ||
506 | mi->mi_entry_size = entry_size; | |
93407472 | 507 | mi->mi_entries_per_block = i_blocksize(inode) / entry_size; |
5eb563f5 RK |
508 | mi->mi_first_entry_offset = DIV_ROUND_UP(header_size, entry_size); |
509 | } | |
510 | ||
ebdfed4d RK |
511 | /** |
512 | * nilfs_mdt_setup_shadow_map - setup shadow map and bind it to metadata file | |
513 | * @inode: inode of the metadata file | |
514 | * @shadow: shadow mapping | |
515 | */ | |
516 | int nilfs_mdt_setup_shadow_map(struct inode *inode, | |
517 | struct nilfs_shadow_map *shadow) | |
518 | { | |
519 | struct nilfs_mdt_info *mi = NILFS_MDT(inode); | |
6e211930 | 520 | struct inode *s_inode; |
ebdfed4d RK |
521 | |
522 | INIT_LIST_HEAD(&shadow->frozen_buffers); | |
6e211930 RK |
523 | |
524 | s_inode = nilfs_iget_for_shadow(inode); | |
525 | if (IS_ERR(s_inode)) | |
526 | return PTR_ERR(s_inode); | |
527 | ||
528 | shadow->inode = s_inode; | |
ebdfed4d RK |
529 | mi->mi_shadow = shadow; |
530 | return 0; | |
531 | } | |
532 | ||
533 | /** | |
534 | * nilfs_mdt_save_to_shadow_map - copy bmap and dirty pages to shadow map | |
535 | * @inode: inode of the metadata file | |
536 | */ | |
537 | int nilfs_mdt_save_to_shadow_map(struct inode *inode) | |
538 | { | |
539 | struct nilfs_mdt_info *mi = NILFS_MDT(inode); | |
540 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
541 | struct nilfs_shadow_map *shadow = mi->mi_shadow; | |
6e211930 | 542 | struct inode *s_inode = shadow->inode; |
ebdfed4d RK |
543 | int ret; |
544 | ||
6e211930 | 545 | ret = nilfs_copy_dirty_pages(s_inode->i_mapping, inode->i_mapping); |
ebdfed4d RK |
546 | if (ret) |
547 | goto out; | |
548 | ||
6e211930 | 549 | ret = nilfs_copy_dirty_pages(NILFS_I(s_inode)->i_assoc_inode->i_mapping, |
e897be17 | 550 | ii->i_assoc_inode->i_mapping); |
ebdfed4d RK |
551 | if (ret) |
552 | goto out; | |
553 | ||
554 | nilfs_bmap_save(ii->i_bmap, &shadow->bmap_store); | |
555 | out: | |
556 | return ret; | |
557 | } | |
558 | ||
b1f6a4f2 RK |
559 | int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh) |
560 | { | |
561 | struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow; | |
562 | struct buffer_head *bh_frozen; | |
563 | struct page *page; | |
564 | int blkbits = inode->i_blkbits; | |
b1f6a4f2 | 565 | |
6ad4cd7f | 566 | page = grab_cache_page(shadow->inode->i_mapping, bh->b_folio->index); |
b1f6a4f2 | 567 | if (!page) |
a7a8447e | 568 | return -ENOMEM; |
b1f6a4f2 RK |
569 | |
570 | if (!page_has_buffers(page)) | |
571 | create_empty_buffers(page, 1 << blkbits, 0); | |
572 | ||
573 | bh_frozen = nilfs_page_get_nth_block(page, bh_offset(bh) >> blkbits); | |
a7a8447e RK |
574 | |
575 | if (!buffer_uptodate(bh_frozen)) | |
576 | nilfs_copy_buffer(bh_frozen, bh); | |
577 | if (list_empty(&bh_frozen->b_assoc_buffers)) { | |
578 | list_add_tail(&bh_frozen->b_assoc_buffers, | |
579 | &shadow->frozen_buffers); | |
580 | set_buffer_nilfs_redirected(bh); | |
581 | } else { | |
582 | brelse(bh_frozen); /* already frozen */ | |
b1f6a4f2 | 583 | } |
a7a8447e | 584 | |
b1f6a4f2 | 585 | unlock_page(page); |
09cbfeaf | 586 | put_page(page); |
a7a8447e | 587 | return 0; |
b1f6a4f2 RK |
588 | } |
589 | ||
590 | struct buffer_head * | |
591 | nilfs_mdt_get_frozen_buffer(struct inode *inode, struct buffer_head *bh) | |
592 | { | |
593 | struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow; | |
594 | struct buffer_head *bh_frozen = NULL; | |
595 | struct page *page; | |
596 | int n; | |
597 | ||
6ad4cd7f | 598 | page = find_lock_page(shadow->inode->i_mapping, bh->b_folio->index); |
b1f6a4f2 RK |
599 | if (page) { |
600 | if (page_has_buffers(page)) { | |
601 | n = bh_offset(bh) >> inode->i_blkbits; | |
602 | bh_frozen = nilfs_page_get_nth_block(page, n); | |
603 | } | |
604 | unlock_page(page); | |
09cbfeaf | 605 | put_page(page); |
b1f6a4f2 RK |
606 | } |
607 | return bh_frozen; | |
608 | } | |
609 | ||
610 | static void nilfs_release_frozen_buffers(struct nilfs_shadow_map *shadow) | |
611 | { | |
612 | struct list_head *head = &shadow->frozen_buffers; | |
613 | struct buffer_head *bh; | |
614 | ||
615 | while (!list_empty(head)) { | |
616 | bh = list_first_entry(head, struct buffer_head, | |
617 | b_assoc_buffers); | |
618 | list_del_init(&bh->b_assoc_buffers); | |
619 | brelse(bh); /* drop ref-count to make it releasable */ | |
620 | } | |
621 | } | |
622 | ||
ebdfed4d RK |
623 | /** |
624 | * nilfs_mdt_restore_from_shadow_map - restore dirty pages and bmap state | |
625 | * @inode: inode of the metadata file | |
626 | */ | |
627 | void nilfs_mdt_restore_from_shadow_map(struct inode *inode) | |
628 | { | |
629 | struct nilfs_mdt_info *mi = NILFS_MDT(inode); | |
630 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
631 | struct nilfs_shadow_map *shadow = mi->mi_shadow; | |
632 | ||
633 | down_write(&mi->mi_sem); | |
634 | ||
635 | if (mi->mi_palloc_cache) | |
636 | nilfs_palloc_clear_cache(inode); | |
637 | ||
8c26c4e2 | 638 | nilfs_clear_dirty_pages(inode->i_mapping, true); |
6e211930 | 639 | nilfs_copy_back_pages(inode->i_mapping, shadow->inode->i_mapping); |
ebdfed4d | 640 | |
e897be17 RK |
641 | nilfs_clear_dirty_pages(ii->i_assoc_inode->i_mapping, true); |
642 | nilfs_copy_back_pages(ii->i_assoc_inode->i_mapping, | |
6e211930 | 643 | NILFS_I(shadow->inode)->i_assoc_inode->i_mapping); |
ebdfed4d RK |
644 | |
645 | nilfs_bmap_restore(ii->i_bmap, &shadow->bmap_store); | |
646 | ||
647 | up_write(&mi->mi_sem); | |
648 | } | |
649 | ||
650 | /** | |
651 | * nilfs_mdt_clear_shadow_map - truncate pages in shadow map caches | |
652 | * @inode: inode of the metadata file | |
653 | */ | |
654 | void nilfs_mdt_clear_shadow_map(struct inode *inode) | |
655 | { | |
656 | struct nilfs_mdt_info *mi = NILFS_MDT(inode); | |
657 | struct nilfs_shadow_map *shadow = mi->mi_shadow; | |
6e211930 | 658 | struct inode *shadow_btnc_inode = NILFS_I(shadow->inode)->i_assoc_inode; |
ebdfed4d RK |
659 | |
660 | down_write(&mi->mi_sem); | |
b1f6a4f2 | 661 | nilfs_release_frozen_buffers(shadow); |
6e211930 RK |
662 | truncate_inode_pages(shadow->inode->i_mapping, 0); |
663 | truncate_inode_pages(shadow_btnc_inode->i_mapping, 0); | |
ebdfed4d RK |
664 | up_write(&mi->mi_sem); |
665 | } |