~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/nilfs2/mdt.c

Version: ~ [ linux-5.1-rc1 ] ~ [ linux-5.0.3 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.30 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.107 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.164 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.176 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.136 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.63 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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  * Written by Ryusuke Konishi.
 17  */
 18 
 19 #include <linux/buffer_head.h>
 20 #include <linux/mpage.h>
 21 #include <linux/mm.h>
 22 #include <linux/writeback.h>
 23 #include <linux/backing-dev.h>
 24 #include <linux/swap.h>
 25 #include <linux/slab.h>
 26 #include "nilfs.h"
 27 #include "btnode.h"
 28 #include "segment.h"
 29 #include "page.h"
 30 #include "mdt.h"
 31 #include "alloc.h"              /* nilfs_palloc_destroy_cache() */
 32 
 33 #include <trace/events/nilfs2.h>
 34 
 35 #define NILFS_MDT_MAX_RA_BLOCKS         (16 - 1)
 36 
 37 
 38 static int
 39 nilfs_mdt_insert_new_block(struct inode *inode, unsigned long block,
 40                            struct buffer_head *bh,
 41                            void (*init_block)(struct inode *,
 42                                               struct buffer_head *, void *))
 43 {
 44         struct nilfs_inode_info *ii = NILFS_I(inode);
 45         void *kaddr;
 46         int ret;
 47 
 48         /* Caller exclude read accesses using page lock */
 49 
 50         /* set_buffer_new(bh); */
 51         bh->b_blocknr = 0;
 52 
 53         ret = nilfs_bmap_insert(ii->i_bmap, block, (unsigned long)bh);
 54         if (unlikely(ret))
 55                 return ret;
 56 
 57         set_buffer_mapped(bh);
 58 
 59         kaddr = kmap_atomic(bh->b_page);
 60         memset(kaddr + bh_offset(bh), 0, i_blocksize(inode));
 61         if (init_block)
 62                 init_block(inode, bh, kaddr);
 63         flush_dcache_page(bh->b_page);
 64         kunmap_atomic(kaddr);
 65 
 66         set_buffer_uptodate(bh);
 67         mark_buffer_dirty(bh);
 68         nilfs_mdt_mark_dirty(inode);
 69 
 70         trace_nilfs2_mdt_insert_new_block(inode, inode->i_ino, block);
 71 
 72         return 0;
 73 }
 74 
 75 static int nilfs_mdt_create_block(struct inode *inode, unsigned long block,
 76                                   struct buffer_head **out_bh,
 77                                   void (*init_block)(struct inode *,
 78                                                      struct buffer_head *,
 79                                                      void *))
 80 {
 81         struct super_block *sb = inode->i_sb;
 82         struct nilfs_transaction_info ti;
 83         struct buffer_head *bh;
 84         int err;
 85 
 86         nilfs_transaction_begin(sb, &ti, 0);
 87 
 88         err = -ENOMEM;
 89         bh = nilfs_grab_buffer(inode, inode->i_mapping, block, 0);
 90         if (unlikely(!bh))
 91                 goto failed_unlock;
 92 
 93         err = -EEXIST;
 94         if (buffer_uptodate(bh))
 95                 goto failed_bh;
 96 
 97         wait_on_buffer(bh);
 98         if (buffer_uptodate(bh))
 99                 goto failed_bh;
100 
101         bh->b_bdev = sb->s_bdev;
102         err = nilfs_mdt_insert_new_block(inode, block, bh, init_block);
103         if (likely(!err)) {
104                 get_bh(bh);
105                 *out_bh = bh;
106         }
107 
108  failed_bh:
109         unlock_page(bh->b_page);
110         put_page(bh->b_page);
111         brelse(bh);
112 
113  failed_unlock:
114         if (likely(!err))
115                 err = nilfs_transaction_commit(sb);
116         else
117                 nilfs_transaction_abort(sb);
118 
119         return err;
120 }
121 
122 static int
123 nilfs_mdt_submit_block(struct inode *inode, unsigned long blkoff,
124                        int mode, int mode_flags, struct buffer_head **out_bh)
125 {
126         struct buffer_head *bh;
127         __u64 blknum = 0;
128         int ret = -ENOMEM;
129 
130         bh = nilfs_grab_buffer(inode, inode->i_mapping, blkoff, 0);
131         if (unlikely(!bh))
132                 goto failed;
133 
134         ret = -EEXIST; /* internal code */
135         if (buffer_uptodate(bh))
136                 goto out;
137 
138         if (mode_flags & REQ_RAHEAD) {
139                 if (!trylock_buffer(bh)) {
140                         ret = -EBUSY;
141                         goto failed_bh;
142                 }
143         } else /* mode == READ */
144                 lock_buffer(bh);
145 
146         if (buffer_uptodate(bh)) {
147                 unlock_buffer(bh);
148                 goto out;
149         }
150 
151         ret = nilfs_bmap_lookup(NILFS_I(inode)->i_bmap, blkoff, &blknum);
152         if (unlikely(ret)) {
153                 unlock_buffer(bh);
154                 goto failed_bh;
155         }
156         map_bh(bh, inode->i_sb, (sector_t)blknum);
157 
158         bh->b_end_io = end_buffer_read_sync;
159         get_bh(bh);
160         submit_bh(mode, mode_flags, bh);
161         ret = 0;
162 
163         trace_nilfs2_mdt_submit_block(inode, inode->i_ino, blkoff, mode);
164  out:
165         get_bh(bh);
166         *out_bh = bh;
167 
168  failed_bh:
169         unlock_page(bh->b_page);
170         put_page(bh->b_page);
171         brelse(bh);
172  failed:
173         return ret;
174 }
175 
176 static int nilfs_mdt_read_block(struct inode *inode, unsigned long block,
177                                 int readahead, struct buffer_head **out_bh)
178 {
179         struct buffer_head *first_bh, *bh;
180         unsigned long blkoff;
181         int i, nr_ra_blocks = NILFS_MDT_MAX_RA_BLOCKS;
182         int err;
183 
184         err = nilfs_mdt_submit_block(inode, block, REQ_OP_READ, 0, &first_bh);
185         if (err == -EEXIST) /* internal code */
186                 goto out;
187 
188         if (unlikely(err))
189                 goto failed;
190 
191         if (readahead) {
192                 blkoff = block + 1;
193                 for (i = 0; i < nr_ra_blocks; i++, blkoff++) {
194                         err = nilfs_mdt_submit_block(inode, blkoff, REQ_OP_READ,
195                                                      REQ_RAHEAD, &bh);
196                         if (likely(!err || err == -EEXIST))
197                                 brelse(bh);
198                         else if (err != -EBUSY)
199                                 break;
200                                 /* abort readahead if bmap lookup failed */
201                         if (!buffer_locked(first_bh))
202                                 goto out_no_wait;
203                 }
204         }
205 
206         wait_on_buffer(first_bh);
207 
208  out_no_wait:
209         err = -EIO;
210         if (!buffer_uptodate(first_bh)) {
211                 nilfs_msg(inode->i_sb, KERN_ERR,
212                           "I/O error reading meta-data file (ino=%lu, block-offset=%lu)",
213                           inode->i_ino, block);
214                 goto failed_bh;
215         }
216  out:
217         *out_bh = first_bh;
218         return 0;
219 
220  failed_bh:
221         brelse(first_bh);
222  failed:
223         return err;
224 }
225 
226 /**
227  * nilfs_mdt_get_block - read or create a buffer on meta data file.
228  * @inode: inode of the meta data file
229  * @blkoff: block offset
230  * @create: create flag
231  * @init_block: initializer used for newly allocated block
232  * @out_bh: output of a pointer to the buffer_head
233  *
234  * nilfs_mdt_get_block() looks up the specified buffer and tries to create
235  * a new buffer if @create is not zero.  On success, the returned buffer is
236  * assured to be either existing or formatted using a buffer lock on success.
237  * @out_bh is substituted only when zero is returned.
238  *
239  * Return Value: On success, it returns 0. On error, the following negative
240  * error code is returned.
241  *
242  * %-ENOMEM - Insufficient memory available.
243  *
244  * %-EIO - I/O error
245  *
246  * %-ENOENT - the specified block does not exist (hole block)
247  *
248  * %-EROFS - Read only filesystem (for create mode)
249  */
250 int nilfs_mdt_get_block(struct inode *inode, unsigned long blkoff, int create,
251                         void (*init_block)(struct inode *,
252                                            struct buffer_head *, void *),
253                         struct buffer_head **out_bh)
254 {
255         int ret;
256 
257         /* Should be rewritten with merging nilfs_mdt_read_block() */
258  retry:
259         ret = nilfs_mdt_read_block(inode, blkoff, !create, out_bh);
260         if (!create || ret != -ENOENT)
261                 return ret;
262 
263         ret = nilfs_mdt_create_block(inode, blkoff, out_bh, init_block);
264         if (unlikely(ret == -EEXIST)) {
265                 /* create = 0; */  /* limit read-create loop retries */
266                 goto retry;
267         }
268         return ret;
269 }
270 
271 /**
272  * nilfs_mdt_find_block - find and get a buffer on meta data file.
273  * @inode: inode of the meta data file
274  * @start: start block offset (inclusive)
275  * @end: end block offset (inclusive)
276  * @blkoff: block offset
277  * @out_bh: place to store a pointer to buffer_head struct
278  *
279  * nilfs_mdt_find_block() looks up an existing block in range of
280  * [@start, @end] and stores pointer to a buffer head of the block to
281  * @out_bh, and block offset to @blkoff, respectively.  @out_bh and
282  * @blkoff are substituted only when zero is returned.
283  *
284  * Return Value: On success, it returns 0. On error, the following negative
285  * error code is returned.
286  *
287  * %-ENOMEM - Insufficient memory available.
288  *
289  * %-EIO - I/O error
290  *
291  * %-ENOENT - no block was found in the range
292  */
293 int nilfs_mdt_find_block(struct inode *inode, unsigned long start,
294                          unsigned long end, unsigned long *blkoff,
295                          struct buffer_head **out_bh)
296 {
297         __u64 next;
298         int ret;
299 
300         if (unlikely(start > end))
301                 return -ENOENT;
302 
303         ret = nilfs_mdt_read_block(inode, start, true, out_bh);
304         if (!ret) {
305                 *blkoff = start;
306                 goto out;
307         }
308         if (unlikely(ret != -ENOENT || start == ULONG_MAX))
309                 goto out;
310 
311         ret = nilfs_bmap_seek_key(NILFS_I(inode)->i_bmap, start + 1, &next);
312         if (!ret) {
313                 if (next <= end) {
314                         ret = nilfs_mdt_read_block(inode, next, true, out_bh);
315                         if (!ret)
316                                 *blkoff = next;
317                 } else {
318                         ret = -ENOENT;
319                 }
320         }
321 out:
322         return ret;
323 }
324 
325 /**
326  * nilfs_mdt_delete_block - make a hole on the meta data file.
327  * @inode: inode of the meta data file
328  * @block: block offset
329  *
330  * Return Value: On success, zero is returned.
331  * On error, one of the following negative error code is returned.
332  *
333  * %-ENOMEM - Insufficient memory available.
334  *
335  * %-EIO - I/O error
336  */
337 int nilfs_mdt_delete_block(struct inode *inode, unsigned long block)
338 {
339         struct nilfs_inode_info *ii = NILFS_I(inode);
340         int err;
341 
342         err = nilfs_bmap_delete(ii->i_bmap, block);
343         if (!err || err == -ENOENT) {
344                 nilfs_mdt_mark_dirty(inode);
345                 nilfs_mdt_forget_block(inode, block);
346         }
347         return err;
348 }
349 
350 /**
351  * nilfs_mdt_forget_block - discard dirty state and try to remove the page
352  * @inode: inode of the meta data file
353  * @block: block offset
354  *
355  * nilfs_mdt_forget_block() clears a dirty flag of the specified buffer, and
356  * tries to release the page including the buffer from a page cache.
357  *
358  * Return Value: On success, 0 is returned. On error, one of the following
359  * negative error code is returned.
360  *
361  * %-EBUSY - page has an active buffer.
362  *
363  * %-ENOENT - page cache has no page addressed by the offset.
364  */
365 int nilfs_mdt_forget_block(struct inode *inode, unsigned long block)
366 {
367         pgoff_t index = (pgoff_t)block >>
368                 (PAGE_SHIFT - inode->i_blkbits);
369         struct page *page;
370         unsigned long first_block;
371         int ret = 0;
372         int still_dirty;
373 
374         page = find_lock_page(inode->i_mapping, index);
375         if (!page)
376                 return -ENOENT;
377 
378         wait_on_page_writeback(page);
379 
380         first_block = (unsigned long)index <<
381                 (PAGE_SHIFT - inode->i_blkbits);
382         if (page_has_buffers(page)) {
383                 struct buffer_head *bh;
384 
385                 bh = nilfs_page_get_nth_block(page, block - first_block);
386                 nilfs_forget_buffer(bh);
387         }
388         still_dirty = PageDirty(page);
389         unlock_page(page);
390         put_page(page);
391 
392         if (still_dirty ||
393             invalidate_inode_pages2_range(inode->i_mapping, index, index) != 0)
394                 ret = -EBUSY;
395         return ret;
396 }
397 
398 int nilfs_mdt_fetch_dirty(struct inode *inode)
399 {
400         struct nilfs_inode_info *ii = NILFS_I(inode);
401 
402         if (nilfs_bmap_test_and_clear_dirty(ii->i_bmap)) {
403                 set_bit(NILFS_I_DIRTY, &ii->i_state);
404                 return 1;
405         }
406         return test_bit(NILFS_I_DIRTY, &ii->i_state);
407 }
408 
409 static int
410 nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc)
411 {
412         struct inode *inode = page->mapping->host;
413         struct super_block *sb;
414         int err = 0;
415 
416         if (inode && sb_rdonly(inode->i_sb)) {
417                 /*
418                  * It means that filesystem was remounted in read-only
419                  * mode because of error or metadata corruption. But we
420                  * have dirty pages that try to be flushed in background.
421                  * So, here we simply discard this dirty page.
422                  */
423                 nilfs_clear_dirty_page(page, false);
424                 unlock_page(page);
425                 return -EROFS;
426         }
427 
428         redirty_page_for_writepage(wbc, page);
429         unlock_page(page);
430 
431         if (!inode)
432                 return 0;
433 
434         sb = inode->i_sb;
435 
436         if (wbc->sync_mode == WB_SYNC_ALL)
437                 err = nilfs_construct_segment(sb);
438         else if (wbc->for_reclaim)
439                 nilfs_flush_segment(sb, inode->i_ino);
440 
441         return err;
442 }
443 
444 
445 static const struct address_space_operations def_mdt_aops = {
446         .writepage              = nilfs_mdt_write_page,
447 };
448 
449 static const struct inode_operations def_mdt_iops;
450 static const struct file_operations def_mdt_fops;
451 
452 
453 int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz)
454 {
455         struct nilfs_mdt_info *mi;
456 
457         mi = kzalloc(max(sizeof(*mi), objsz), GFP_NOFS);
458         if (!mi)
459                 return -ENOMEM;
460 
461         init_rwsem(&mi->mi_sem);
462         inode->i_private = mi;
463 
464         inode->i_mode = S_IFREG;
465         mapping_set_gfp_mask(inode->i_mapping, gfp_mask);
466 
467         inode->i_op = &def_mdt_iops;
468         inode->i_fop = &def_mdt_fops;
469         inode->i_mapping->a_ops = &def_mdt_aops;
470 
471         return 0;
472 }
473 
474 /**
475  * nilfs_mdt_clear - do cleanup for the metadata file
476  * @inode: inode of the metadata file
477  */
478 void nilfs_mdt_clear(struct inode *inode)
479 {
480         struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
481 
482         if (mdi->mi_palloc_cache)
483                 nilfs_palloc_destroy_cache(inode);
484 }
485 
486 /**
487  * nilfs_mdt_destroy - release resources used by the metadata file
488  * @inode: inode of the metadata file
489  */
490 void nilfs_mdt_destroy(struct inode *inode)
491 {
492         struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
493 
494         kfree(mdi->mi_bgl); /* kfree(NULL) is safe */
495         kfree(mdi);
496 }
497 
498 void nilfs_mdt_set_entry_size(struct inode *inode, unsigned int entry_size,
499                               unsigned int header_size)
500 {
501         struct nilfs_mdt_info *mi = NILFS_MDT(inode);
502 
503         mi->mi_entry_size = entry_size;
504         mi->mi_entries_per_block = i_blocksize(inode) / entry_size;
505         mi->mi_first_entry_offset = DIV_ROUND_UP(header_size, entry_size);
506 }
507 
508 /**
509  * nilfs_mdt_setup_shadow_map - setup shadow map and bind it to metadata file
510  * @inode: inode of the metadata file
511  * @shadow: shadow mapping
512  */
513 int nilfs_mdt_setup_shadow_map(struct inode *inode,
514                                struct nilfs_shadow_map *shadow)
515 {
516         struct nilfs_mdt_info *mi = NILFS_MDT(inode);
517 
518         INIT_LIST_HEAD(&shadow->frozen_buffers);
519         address_space_init_once(&shadow->frozen_data);
520         nilfs_mapping_init(&shadow->frozen_data, inode);
521         address_space_init_once(&shadow->frozen_btnodes);
522         nilfs_mapping_init(&shadow->frozen_btnodes, inode);
523         mi->mi_shadow = shadow;
524         return 0;
525 }
526 
527 /**
528  * nilfs_mdt_save_to_shadow_map - copy bmap and dirty pages to shadow map
529  * @inode: inode of the metadata file
530  */
531 int nilfs_mdt_save_to_shadow_map(struct inode *inode)
532 {
533         struct nilfs_mdt_info *mi = NILFS_MDT(inode);
534         struct nilfs_inode_info *ii = NILFS_I(inode);
535         struct nilfs_shadow_map *shadow = mi->mi_shadow;
536         int ret;
537 
538         ret = nilfs_copy_dirty_pages(&shadow->frozen_data, inode->i_mapping);
539         if (ret)
540                 goto out;
541 
542         ret = nilfs_copy_dirty_pages(&shadow->frozen_btnodes,
543                                      &ii->i_btnode_cache);
544         if (ret)
545                 goto out;
546 
547         nilfs_bmap_save(ii->i_bmap, &shadow->bmap_store);
548  out:
549         return ret;
550 }
551 
552 int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh)
553 {
554         struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow;
555         struct buffer_head *bh_frozen;
556         struct page *page;
557         int blkbits = inode->i_blkbits;
558 
559         page = grab_cache_page(&shadow->frozen_data, bh->b_page->index);
560         if (!page)
561                 return -ENOMEM;
562 
563         if (!page_has_buffers(page))
564                 create_empty_buffers(page, 1 << blkbits, 0);
565 
566         bh_frozen = nilfs_page_get_nth_block(page, bh_offset(bh) >> blkbits);
567 
568         if (!buffer_uptodate(bh_frozen))
569                 nilfs_copy_buffer(bh_frozen, bh);
570         if (list_empty(&bh_frozen->b_assoc_buffers)) {
571                 list_add_tail(&bh_frozen->b_assoc_buffers,
572                               &shadow->frozen_buffers);
573                 set_buffer_nilfs_redirected(bh);
574         } else {
575                 brelse(bh_frozen); /* already frozen */
576         }
577 
578         unlock_page(page);
579         put_page(page);
580         return 0;
581 }
582 
583 struct buffer_head *
584 nilfs_mdt_get_frozen_buffer(struct inode *inode, struct buffer_head *bh)
585 {
586         struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow;
587         struct buffer_head *bh_frozen = NULL;
588         struct page *page;
589         int n;
590 
591         page = find_lock_page(&shadow->frozen_data, bh->b_page->index);
592         if (page) {
593                 if (page_has_buffers(page)) {
594                         n = bh_offset(bh) >> inode->i_blkbits;
595                         bh_frozen = nilfs_page_get_nth_block(page, n);
596                 }
597                 unlock_page(page);
598                 put_page(page);
599         }
600         return bh_frozen;
601 }
602 
603 static void nilfs_release_frozen_buffers(struct nilfs_shadow_map *shadow)
604 {
605         struct list_head *head = &shadow->frozen_buffers;
606         struct buffer_head *bh;
607 
608         while (!list_empty(head)) {
609                 bh = list_first_entry(head, struct buffer_head,
610                                       b_assoc_buffers);
611                 list_del_init(&bh->b_assoc_buffers);
612                 brelse(bh); /* drop ref-count to make it releasable */
613         }
614 }
615 
616 /**
617  * nilfs_mdt_restore_from_shadow_map - restore dirty pages and bmap state
618  * @inode: inode of the metadata file
619  */
620 void nilfs_mdt_restore_from_shadow_map(struct inode *inode)
621 {
622         struct nilfs_mdt_info *mi = NILFS_MDT(inode);
623         struct nilfs_inode_info *ii = NILFS_I(inode);
624         struct nilfs_shadow_map *shadow = mi->mi_shadow;
625 
626         down_write(&mi->mi_sem);
627 
628         if (mi->mi_palloc_cache)
629                 nilfs_palloc_clear_cache(inode);
630 
631         nilfs_clear_dirty_pages(inode->i_mapping, true);
632         nilfs_copy_back_pages(inode->i_mapping, &shadow->frozen_data);
633 
634         nilfs_clear_dirty_pages(&ii->i_btnode_cache, true);
635         nilfs_copy_back_pages(&ii->i_btnode_cache, &shadow->frozen_btnodes);
636 
637         nilfs_bmap_restore(ii->i_bmap, &shadow->bmap_store);
638 
639         up_write(&mi->mi_sem);
640 }
641 
642 /**
643  * nilfs_mdt_clear_shadow_map - truncate pages in shadow map caches
644  * @inode: inode of the metadata file
645  */
646 void nilfs_mdt_clear_shadow_map(struct inode *inode)
647 {
648         struct nilfs_mdt_info *mi = NILFS_MDT(inode);
649         struct nilfs_shadow_map *shadow = mi->mi_shadow;
650 
651         down_write(&mi->mi_sem);
652         nilfs_release_frozen_buffers(shadow);
653         truncate_inode_pages(&shadow->frozen_data, 0);
654         truncate_inode_pages(&shadow->frozen_btnodes, 0);
655         up_write(&mi->mi_sem);
656 }
657 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp