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Linux/fs/nilfs2/mdt.c

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  1 // SPDX-License-Identifier: GPL-2.0+
  2 /*
  3  * mdt.c - meta data file for NILFS
  4  *
  5  * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
  6  *
  7  * Written by Ryusuke Konishi.
  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>
 16 #include <linux/slab.h>
 17 #include "nilfs.h"
 18 #include "btnode.h"
 19 #include "segment.h"
 20 #include "page.h"
 21 #include "mdt.h"
 22 #include "alloc.h"              /* nilfs_palloc_destroy_cache() */
 23 
 24 #include <trace/events/nilfs2.h>
 25 
 26 #define NILFS_MDT_MAX_RA_BLOCKS         (16 - 1)
 27 
 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 
 50         kaddr = kmap_atomic(bh->b_page);
 51         memset(kaddr + bh_offset(bh), 0, i_blocksize(inode));
 52         if (init_block)
 53                 init_block(inode, bh, kaddr);
 54         flush_dcache_page(bh->b_page);
 55         kunmap_atomic(kaddr);
 56 
 57         set_buffer_uptodate(bh);
 58         mark_buffer_dirty(bh);
 59         nilfs_mdt_mark_dirty(inode);
 60 
 61         trace_nilfs2_mdt_insert_new_block(inode, inode->i_ino, block);
 62 
 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 {
 72         struct super_block *sb = inode->i_sb;
 73         struct nilfs_transaction_info ti;
 74         struct buffer_head *bh;
 75         int err;
 76 
 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;
 85         if (buffer_uptodate(bh))
 86                 goto failed_bh;
 87 
 88         wait_on_buffer(bh);
 89         if (buffer_uptodate(bh))
 90                 goto failed_bh;
 91 
 92         bh->b_bdev = sb->s_bdev;
 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);
101         put_page(bh->b_page);
102         brelse(bh);
103 
104  failed_unlock:
105         if (likely(!err))
106                 err = nilfs_transaction_commit(sb);
107         else
108                 nilfs_transaction_abort(sb);
109 
110         return err;
111 }
112 
113 static int
114 nilfs_mdt_submit_block(struct inode *inode, unsigned long blkoff,
115                        int mode, int mode_flags, struct buffer_head **out_bh)
116 {
117         struct buffer_head *bh;
118         __u64 blknum = 0;
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 
129         if (mode_flags & REQ_RAHEAD) {
130                 if (!trylock_buffer(bh)) {
131                         ret = -EBUSY;
132                         goto failed_bh;
133                 }
134         } else /* mode == READ */
135                 lock_buffer(bh);
136 
137         if (buffer_uptodate(bh)) {
138                 unlock_buffer(bh);
139                 goto out;
140         }
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;
146         }
147         map_bh(bh, inode->i_sb, (sector_t)blknum);
148 
149         bh->b_end_io = end_buffer_read_sync;
150         get_bh(bh);
151         submit_bh(mode, mode_flags, bh);
152         ret = 0;
153 
154         trace_nilfs2_mdt_submit_block(inode, inode->i_ino, blkoff, mode);
155  out:
156         get_bh(bh);
157         *out_bh = bh;
158 
159  failed_bh:
160         unlock_page(bh->b_page);
161         put_page(bh->b_page);
162         brelse(bh);
163  failed:
164         return ret;
165 }
166 
167 static int nilfs_mdt_read_block(struct inode *inode, unsigned long block,
168                                 int readahead, struct buffer_head **out_bh)
169 {
170         struct buffer_head *first_bh, *bh;
171         unsigned long blkoff;
172         int i, nr_ra_blocks = NILFS_MDT_MAX_RA_BLOCKS;
173         int err;
174 
175         err = nilfs_mdt_submit_block(inode, block, REQ_OP_READ, 0, &first_bh);
176         if (err == -EEXIST) /* internal code */
177                 goto out;
178 
179         if (unlikely(err))
180                 goto failed;
181 
182         if (readahead) {
183                 blkoff = block + 1;
184                 for (i = 0; i < nr_ra_blocks; i++, blkoff++) {
185                         err = nilfs_mdt_submit_block(inode, blkoff, REQ_OP_READ,
186                                                      REQ_RAHEAD, &bh);
187                         if (likely(!err || err == -EEXIST))
188                                 brelse(bh);
189                         else if (err != -EBUSY)
190                                 break;
191                                 /* abort readahead if bmap lookup failed */
192                         if (!buffer_locked(first_bh))
193                                 goto out_no_wait;
194                 }
195         }
196 
197         wait_on_buffer(first_bh);
198 
199  out_no_wait:
200         err = -EIO;
201         if (!buffer_uptodate(first_bh)) {
202                 nilfs_msg(inode->i_sb, KERN_ERR,
203                           "I/O error reading meta-data file (ino=%lu, block-offset=%lu)",
204                           inode->i_ino, block);
205                 goto failed_bh;
206         }
207  out:
208         *out_bh = first_bh;
209         return 0;
210 
211  failed_bh:
212         brelse(first_bh);
213  failed:
214         return err;
215 }
216 
217 /**
218  * nilfs_mdt_get_block - read or create a buffer on meta data file.
219  * @inode: inode of the meta data file
220  * @blkoff: block offset
221  * @create: create flag
222  * @init_block: initializer used for newly allocated block
223  * @out_bh: output of a pointer to the buffer_head
224  *
225  * nilfs_mdt_get_block() looks up the specified buffer and tries to create
226  * a new buffer if @create is not zero.  On success, the returned buffer is
227  * assured to be either existing or formatted using a buffer lock on success.
228  * @out_bh is substituted only when zero is returned.
229  *
230  * Return Value: On success, it returns 0. On error, the following negative
231  * error code is returned.
232  *
233  * %-ENOMEM - Insufficient memory available.
234  *
235  * %-EIO - I/O error
236  *
237  * %-ENOENT - the specified block does not exist (hole block)
238  *
239  * %-EROFS - Read only filesystem (for create mode)
240  */
241 int nilfs_mdt_get_block(struct inode *inode, unsigned long blkoff, int create,
242                         void (*init_block)(struct inode *,
243                                            struct buffer_head *, void *),
244                         struct buffer_head **out_bh)
245 {
246         int ret;
247 
248         /* Should be rewritten with merging nilfs_mdt_read_block() */
249  retry:
250         ret = nilfs_mdt_read_block(inode, blkoff, !create, out_bh);
251         if (!create || ret != -ENOENT)
252                 return ret;
253 
254         ret = nilfs_mdt_create_block(inode, blkoff, out_bh, init_block);
255         if (unlikely(ret == -EEXIST)) {
256                 /* create = 0; */  /* limit read-create loop retries */
257                 goto retry;
258         }
259         return ret;
260 }
261 
262 /**
263  * nilfs_mdt_find_block - find and get a buffer on meta data file.
264  * @inode: inode of the meta data file
265  * @start: start block offset (inclusive)
266  * @end: end block offset (inclusive)
267  * @blkoff: block offset
268  * @out_bh: place to store a pointer to buffer_head struct
269  *
270  * nilfs_mdt_find_block() looks up an existing block in range of
271  * [@start, @end] and stores pointer to a buffer head of the block to
272  * @out_bh, and block offset to @blkoff, respectively.  @out_bh and
273  * @blkoff are substituted only when zero is returned.
274  *
275  * Return Value: On success, it returns 0. On error, the following negative
276  * error code is returned.
277  *
278  * %-ENOMEM - Insufficient memory available.
279  *
280  * %-EIO - I/O error
281  *
282  * %-ENOENT - no block was found in the range
283  */
284 int nilfs_mdt_find_block(struct inode *inode, unsigned long start,
285                          unsigned long end, unsigned long *blkoff,
286                          struct buffer_head **out_bh)
287 {
288         __u64 next;
289         int ret;
290 
291         if (unlikely(start > end))
292                 return -ENOENT;
293 
294         ret = nilfs_mdt_read_block(inode, start, true, out_bh);
295         if (!ret) {
296                 *blkoff = start;
297                 goto out;
298         }
299         if (unlikely(ret != -ENOENT || start == ULONG_MAX))
300                 goto out;
301 
302         ret = nilfs_bmap_seek_key(NILFS_I(inode)->i_bmap, start + 1, &next);
303         if (!ret) {
304                 if (next <= end) {
305                         ret = nilfs_mdt_read_block(inode, next, true, out_bh);
306                         if (!ret)
307                                 *blkoff = next;
308                 } else {
309                         ret = -ENOENT;
310                 }
311         }
312 out:
313         return ret;
314 }
315 
316 /**
317  * nilfs_mdt_delete_block - make a hole on the meta data file.
318  * @inode: inode of the meta data file
319  * @block: block offset
320  *
321  * Return Value: On success, zero is returned.
322  * On error, one of the following negative error code is returned.
323  *
324  * %-ENOMEM - Insufficient memory available.
325  *
326  * %-EIO - I/O error
327  */
328 int nilfs_mdt_delete_block(struct inode *inode, unsigned long block)
329 {
330         struct nilfs_inode_info *ii = NILFS_I(inode);
331         int err;
332 
333         err = nilfs_bmap_delete(ii->i_bmap, block);
334         if (!err || err == -ENOENT) {
335                 nilfs_mdt_mark_dirty(inode);
336                 nilfs_mdt_forget_block(inode, block);
337         }
338         return err;
339 }
340 
341 /**
342  * nilfs_mdt_forget_block - discard dirty state and try to remove the page
343  * @inode: inode of the meta data file
344  * @block: block offset
345  *
346  * nilfs_mdt_forget_block() clears a dirty flag of the specified buffer, and
347  * tries to release the page including the buffer from a page cache.
348  *
349  * Return Value: On success, 0 is returned. On error, one of the following
350  * negative error code is returned.
351  *
352  * %-EBUSY - page has an active buffer.
353  *
354  * %-ENOENT - page cache has no page addressed by the offset.
355  */
356 int nilfs_mdt_forget_block(struct inode *inode, unsigned long block)
357 {
358         pgoff_t index = (pgoff_t)block >>
359                 (PAGE_SHIFT - inode->i_blkbits);
360         struct page *page;
361         unsigned long first_block;
362         int ret = 0;
363         int still_dirty;
364 
365         page = find_lock_page(inode->i_mapping, index);
366         if (!page)
367                 return -ENOENT;
368 
369         wait_on_page_writeback(page);
370 
371         first_block = (unsigned long)index <<
372                 (PAGE_SHIFT - inode->i_blkbits);
373         if (page_has_buffers(page)) {
374                 struct buffer_head *bh;
375 
376                 bh = nilfs_page_get_nth_block(page, block - first_block);
377                 nilfs_forget_buffer(bh);
378         }
379         still_dirty = PageDirty(page);
380         unlock_page(page);
381         put_page(page);
382 
383         if (still_dirty ||
384             invalidate_inode_pages2_range(inode->i_mapping, index, index) != 0)
385                 ret = -EBUSY;
386         return ret;
387 }
388 
389 int nilfs_mdt_fetch_dirty(struct inode *inode)
390 {
391         struct nilfs_inode_info *ii = NILFS_I(inode);
392 
393         if (nilfs_bmap_test_and_clear_dirty(ii->i_bmap)) {
394                 set_bit(NILFS_I_DIRTY, &ii->i_state);
395                 return 1;
396         }
397         return test_bit(NILFS_I_DIRTY, &ii->i_state);
398 }
399 
400 static int
401 nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc)
402 {
403         struct inode *inode = page->mapping->host;
404         struct super_block *sb;
405         int err = 0;
406 
407         if (inode && sb_rdonly(inode->i_sb)) {
408                 /*
409                  * It means that filesystem was remounted in read-only
410                  * mode because of error or metadata corruption. But we
411                  * have dirty pages that try to be flushed in background.
412                  * So, here we simply discard this dirty page.
413                  */
414                 nilfs_clear_dirty_page(page, false);
415                 unlock_page(page);
416                 return -EROFS;
417         }
418 
419         redirty_page_for_writepage(wbc, page);
420         unlock_page(page);
421 
422         if (!inode)
423                 return 0;
424 
425         sb = inode->i_sb;
426 
427         if (wbc->sync_mode == WB_SYNC_ALL)
428                 err = nilfs_construct_segment(sb);
429         else if (wbc->for_reclaim)
430                 nilfs_flush_segment(sb, inode->i_ino);
431 
432         return err;
433 }
434 
435 
436 static const struct address_space_operations def_mdt_aops = {
437         .writepage              = nilfs_mdt_write_page,
438 };
439 
440 static const struct inode_operations def_mdt_iops;
441 static const struct file_operations def_mdt_fops;
442 
443 
444 int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz)
445 {
446         struct nilfs_mdt_info *mi;
447 
448         mi = kzalloc(max(sizeof(*mi), objsz), GFP_NOFS);
449         if (!mi)
450                 return -ENOMEM;
451 
452         init_rwsem(&mi->mi_sem);
453         inode->i_private = mi;
454 
455         inode->i_mode = S_IFREG;
456         mapping_set_gfp_mask(inode->i_mapping, gfp_mask);
457 
458         inode->i_op = &def_mdt_iops;
459         inode->i_fop = &def_mdt_fops;
460         inode->i_mapping->a_ops = &def_mdt_aops;
461 
462         return 0;
463 }
464 
465 /**
466  * nilfs_mdt_clear - do cleanup for the metadata file
467  * @inode: inode of the metadata file
468  */
469 void nilfs_mdt_clear(struct inode *inode)
470 {
471         struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
472 
473         if (mdi->mi_palloc_cache)
474                 nilfs_palloc_destroy_cache(inode);
475 }
476 
477 /**
478  * nilfs_mdt_destroy - release resources used by the metadata file
479  * @inode: inode of the metadata file
480  */
481 void nilfs_mdt_destroy(struct inode *inode)
482 {
483         struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
484 
485         kfree(mdi->mi_bgl); /* kfree(NULL) is safe */
486         kfree(mdi);
487 }
488 
489 void nilfs_mdt_set_entry_size(struct inode *inode, unsigned int entry_size,
490                               unsigned int header_size)
491 {
492         struct nilfs_mdt_info *mi = NILFS_MDT(inode);
493 
494         mi->mi_entry_size = entry_size;
495         mi->mi_entries_per_block = i_blocksize(inode) / entry_size;
496         mi->mi_first_entry_offset = DIV_ROUND_UP(header_size, entry_size);
497 }
498 
499 /**
500  * nilfs_mdt_setup_shadow_map - setup shadow map and bind it to metadata file
501  * @inode: inode of the metadata file
502  * @shadow: shadow mapping
503  */
504 int nilfs_mdt_setup_shadow_map(struct inode *inode,
505                                struct nilfs_shadow_map *shadow)
506 {
507         struct nilfs_mdt_info *mi = NILFS_MDT(inode);
508 
509         INIT_LIST_HEAD(&shadow->frozen_buffers);
510         address_space_init_once(&shadow->frozen_data);
511         nilfs_mapping_init(&shadow->frozen_data, inode);
512         address_space_init_once(&shadow->frozen_btnodes);
513         nilfs_mapping_init(&shadow->frozen_btnodes, inode);
514         mi->mi_shadow = shadow;
515         return 0;
516 }
517 
518 /**
519  * nilfs_mdt_save_to_shadow_map - copy bmap and dirty pages to shadow map
520  * @inode: inode of the metadata file
521  */
522 int nilfs_mdt_save_to_shadow_map(struct inode *inode)
523 {
524         struct nilfs_mdt_info *mi = NILFS_MDT(inode);
525         struct nilfs_inode_info *ii = NILFS_I(inode);
526         struct nilfs_shadow_map *shadow = mi->mi_shadow;
527         int ret;
528 
529         ret = nilfs_copy_dirty_pages(&shadow->frozen_data, inode->i_mapping);
530         if (ret)
531                 goto out;
532 
533         ret = nilfs_copy_dirty_pages(&shadow->frozen_btnodes,
534                                      &ii->i_btnode_cache);
535         if (ret)
536                 goto out;
537 
538         nilfs_bmap_save(ii->i_bmap, &shadow->bmap_store);
539  out:
540         return ret;
541 }
542 
543 int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh)
544 {
545         struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow;
546         struct buffer_head *bh_frozen;
547         struct page *page;
548         int blkbits = inode->i_blkbits;
549 
550         page = grab_cache_page(&shadow->frozen_data, bh->b_page->index);
551         if (!page)
552                 return -ENOMEM;
553 
554         if (!page_has_buffers(page))
555                 create_empty_buffers(page, 1 << blkbits, 0);
556 
557         bh_frozen = nilfs_page_get_nth_block(page, bh_offset(bh) >> blkbits);
558 
559         if (!buffer_uptodate(bh_frozen))
560                 nilfs_copy_buffer(bh_frozen, bh);
561         if (list_empty(&bh_frozen->b_assoc_buffers)) {
562                 list_add_tail(&bh_frozen->b_assoc_buffers,
563                               &shadow->frozen_buffers);
564                 set_buffer_nilfs_redirected(bh);
565         } else {
566                 brelse(bh_frozen); /* already frozen */
567         }
568 
569         unlock_page(page);
570         put_page(page);
571         return 0;
572 }
573 
574 struct buffer_head *
575 nilfs_mdt_get_frozen_buffer(struct inode *inode, struct buffer_head *bh)
576 {
577         struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow;
578         struct buffer_head *bh_frozen = NULL;
579         struct page *page;
580         int n;
581 
582         page = find_lock_page(&shadow->frozen_data, bh->b_page->index);
583         if (page) {
584                 if (page_has_buffers(page)) {
585                         n = bh_offset(bh) >> inode->i_blkbits;
586                         bh_frozen = nilfs_page_get_nth_block(page, n);
587                 }
588                 unlock_page(page);
589                 put_page(page);
590         }
591         return bh_frozen;
592 }
593 
594 static void nilfs_release_frozen_buffers(struct nilfs_shadow_map *shadow)
595 {
596         struct list_head *head = &shadow->frozen_buffers;
597         struct buffer_head *bh;
598 
599         while (!list_empty(head)) {
600                 bh = list_first_entry(head, struct buffer_head,
601                                       b_assoc_buffers);
602                 list_del_init(&bh->b_assoc_buffers);
603                 brelse(bh); /* drop ref-count to make it releasable */
604         }
605 }
606 
607 /**
608  * nilfs_mdt_restore_from_shadow_map - restore dirty pages and bmap state
609  * @inode: inode of the metadata file
610  */
611 void nilfs_mdt_restore_from_shadow_map(struct inode *inode)
612 {
613         struct nilfs_mdt_info *mi = NILFS_MDT(inode);
614         struct nilfs_inode_info *ii = NILFS_I(inode);
615         struct nilfs_shadow_map *shadow = mi->mi_shadow;
616 
617         down_write(&mi->mi_sem);
618 
619         if (mi->mi_palloc_cache)
620                 nilfs_palloc_clear_cache(inode);
621 
622         nilfs_clear_dirty_pages(inode->i_mapping, true);
623         nilfs_copy_back_pages(inode->i_mapping, &shadow->frozen_data);
624 
625         nilfs_clear_dirty_pages(&ii->i_btnode_cache, true);
626         nilfs_copy_back_pages(&ii->i_btnode_cache, &shadow->frozen_btnodes);
627 
628         nilfs_bmap_restore(ii->i_bmap, &shadow->bmap_store);
629 
630         up_write(&mi->mi_sem);
631 }
632 
633 /**
634  * nilfs_mdt_clear_shadow_map - truncate pages in shadow map caches
635  * @inode: inode of the metadata file
636  */
637 void nilfs_mdt_clear_shadow_map(struct inode *inode)
638 {
639         struct nilfs_mdt_info *mi = NILFS_MDT(inode);
640         struct nilfs_shadow_map *shadow = mi->mi_shadow;
641 
642         down_write(&mi->mi_sem);
643         nilfs_release_frozen_buffers(shadow);
644         truncate_inode_pages(&shadow->frozen_data, 0);
645         truncate_inode_pages(&shadow->frozen_btnodes, 0);
646         up_write(&mi->mi_sem);
647 }
648 

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