1 // SPDX-License-Identifier: GPL-2.0+
5 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
7 * Written by Koji Sato.
11 #include <linux/string.h>
12 #include <linux/errno.h>
22 struct inode *nilfs_bmap_get_dat(const struct nilfs_bmap *bmap)
24 struct the_nilfs *nilfs = bmap->b_inode->i_sb->s_fs_info;
29 static int nilfs_bmap_convert_error(struct nilfs_bmap *bmap,
30 const char *fname, int err)
32 struct inode *inode = bmap->b_inode;
35 __nilfs_error(inode->i_sb, fname,
36 "broken bmap (inode number=%lu)", inode->i_ino);
43 * nilfs_bmap_lookup_at_level - find a data block or node block
47 * @ptrp: place to store the value associated to @key
49 * Description: nilfs_bmap_lookup_at_level() finds a record whose key
50 * matches @key in the block at @level of the bmap.
52 * Return Value: On success, 0 is returned and the record associated with @key
53 * is stored in the place pointed by @ptrp. On error, one of the following
54 * negative error codes is returned.
58 * %-ENOMEM - Insufficient amount of memory available.
60 * %-ENOENT - A record associated with @key does not exist.
62 int nilfs_bmap_lookup_at_level(struct nilfs_bmap *bmap, __u64 key, int level,
68 down_read(&bmap->b_sem);
69 ret = bmap->b_ops->bop_lookup(bmap, key, level, ptrp);
73 if (NILFS_BMAP_USE_VBN(bmap)) {
74 ret = nilfs_dat_translate(nilfs_bmap_get_dat(bmap), *ptrp,
78 else if (ret == -ENOENT) {
80 * If there was no valid entry in DAT for the block
81 * address obtained by b_ops->bop_lookup, then pass
82 * internal code -EINVAL to nilfs_bmap_convert_error
83 * to treat it as metadata corruption.
90 up_read(&bmap->b_sem);
91 return nilfs_bmap_convert_error(bmap, __func__, ret);
94 int nilfs_bmap_lookup_contig(struct nilfs_bmap *bmap, __u64 key, __u64 *ptrp,
95 unsigned int maxblocks)
99 down_read(&bmap->b_sem);
100 ret = bmap->b_ops->bop_lookup_contig(bmap, key, ptrp, maxblocks);
101 up_read(&bmap->b_sem);
103 return nilfs_bmap_convert_error(bmap, __func__, ret);
106 static int nilfs_bmap_do_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr)
108 __u64 keys[NILFS_BMAP_SMALL_HIGH + 1];
109 __u64 ptrs[NILFS_BMAP_SMALL_HIGH + 1];
112 if (bmap->b_ops->bop_check_insert != NULL) {
113 ret = bmap->b_ops->bop_check_insert(bmap, key);
115 n = bmap->b_ops->bop_gather_data(
116 bmap, keys, ptrs, NILFS_BMAP_SMALL_HIGH + 1);
119 ret = nilfs_btree_convert_and_insert(
120 bmap, key, ptr, keys, ptrs, n);
122 bmap->b_u.u_flags |= NILFS_BMAP_LARGE;
129 return bmap->b_ops->bop_insert(bmap, key, ptr);
133 * nilfs_bmap_insert - insert a new key-record pair into a bmap
138 * Description: nilfs_bmap_insert() inserts the new key-record pair specified
139 * by @key and @rec into @bmap.
141 * Return Value: On success, 0 is returned. On error, one of the following
142 * negative error codes is returned.
146 * %-ENOMEM - Insufficient amount of memory available.
148 * %-EEXIST - A record associated with @key already exist.
150 int nilfs_bmap_insert(struct nilfs_bmap *bmap, __u64 key, unsigned long rec)
154 down_write(&bmap->b_sem);
155 ret = nilfs_bmap_do_insert(bmap, key, rec);
156 up_write(&bmap->b_sem);
158 return nilfs_bmap_convert_error(bmap, __func__, ret);
161 static int nilfs_bmap_do_delete(struct nilfs_bmap *bmap, __u64 key)
163 __u64 keys[NILFS_BMAP_LARGE_LOW + 1];
164 __u64 ptrs[NILFS_BMAP_LARGE_LOW + 1];
167 if (bmap->b_ops->bop_check_delete != NULL) {
168 ret = bmap->b_ops->bop_check_delete(bmap, key);
170 n = bmap->b_ops->bop_gather_data(
171 bmap, keys, ptrs, NILFS_BMAP_LARGE_LOW + 1);
174 ret = nilfs_direct_delete_and_convert(
175 bmap, key, keys, ptrs, n);
177 bmap->b_u.u_flags &= ~NILFS_BMAP_LARGE;
184 return bmap->b_ops->bop_delete(bmap, key);
188 * nilfs_bmap_seek_key - seek a valid entry and return its key
190 * @start: start key number
191 * @keyp: place to store valid key
193 * Description: nilfs_bmap_seek_key() seeks a valid key on @bmap
194 * starting from @start, and stores it to @keyp if found.
196 * Return Value: On success, 0 is returned. On error, one of the following
197 * negative error codes is returned.
201 * %-ENOMEM - Insufficient amount of memory available.
203 * %-ENOENT - No valid entry was found
205 int nilfs_bmap_seek_key(struct nilfs_bmap *bmap, __u64 start, __u64 *keyp)
209 down_read(&bmap->b_sem);
210 ret = bmap->b_ops->bop_seek_key(bmap, start, keyp);
211 up_read(&bmap->b_sem);
214 ret = nilfs_bmap_convert_error(bmap, __func__, ret);
218 int nilfs_bmap_last_key(struct nilfs_bmap *bmap, __u64 *keyp)
222 down_read(&bmap->b_sem);
223 ret = bmap->b_ops->bop_last_key(bmap, keyp);
224 up_read(&bmap->b_sem);
227 ret = nilfs_bmap_convert_error(bmap, __func__, ret);
232 * nilfs_bmap_delete - delete a key-record pair from a bmap
236 * Description: nilfs_bmap_delete() deletes the key-record pair specified by
239 * Return Value: On success, 0 is returned. On error, one of the following
240 * negative error codes is returned.
244 * %-ENOMEM - Insufficient amount of memory available.
246 * %-ENOENT - A record associated with @key does not exist.
248 int nilfs_bmap_delete(struct nilfs_bmap *bmap, __u64 key)
252 down_write(&bmap->b_sem);
253 ret = nilfs_bmap_do_delete(bmap, key);
254 up_write(&bmap->b_sem);
256 return nilfs_bmap_convert_error(bmap, __func__, ret);
259 static int nilfs_bmap_do_truncate(struct nilfs_bmap *bmap, __u64 key)
264 ret = bmap->b_ops->bop_last_key(bmap, &lastkey);
271 while (key <= lastkey) {
272 ret = nilfs_bmap_do_delete(bmap, lastkey);
275 ret = bmap->b_ops->bop_last_key(bmap, &lastkey);
286 * nilfs_bmap_truncate - truncate a bmap to a specified key
290 * Description: nilfs_bmap_truncate() removes key-record pairs whose keys are
291 * greater than or equal to @key from @bmap.
293 * Return Value: On success, 0 is returned. On error, one of the following
294 * negative error codes is returned.
298 * %-ENOMEM - Insufficient amount of memory available.
300 int nilfs_bmap_truncate(struct nilfs_bmap *bmap, __u64 key)
304 down_write(&bmap->b_sem);
305 ret = nilfs_bmap_do_truncate(bmap, key);
306 up_write(&bmap->b_sem);
308 return nilfs_bmap_convert_error(bmap, __func__, ret);
312 * nilfs_bmap_clear - free resources a bmap holds
315 * Description: nilfs_bmap_clear() frees resources associated with @bmap.
317 void nilfs_bmap_clear(struct nilfs_bmap *bmap)
319 down_write(&bmap->b_sem);
320 if (bmap->b_ops->bop_clear != NULL)
321 bmap->b_ops->bop_clear(bmap);
322 up_write(&bmap->b_sem);
326 * nilfs_bmap_propagate - propagate dirty state
330 * Description: nilfs_bmap_propagate() marks the buffers that directly or
331 * indirectly refer to the block specified by @bh dirty.
333 * Return Value: On success, 0 is returned. On error, one of the following
334 * negative error codes is returned.
338 * %-ENOMEM - Insufficient amount of memory available.
340 int nilfs_bmap_propagate(struct nilfs_bmap *bmap, struct buffer_head *bh)
344 down_write(&bmap->b_sem);
345 ret = bmap->b_ops->bop_propagate(bmap, bh);
346 up_write(&bmap->b_sem);
348 return nilfs_bmap_convert_error(bmap, __func__, ret);
352 * nilfs_bmap_lookup_dirty_buffers -
354 * @listp: pointer to buffer head list
356 void nilfs_bmap_lookup_dirty_buffers(struct nilfs_bmap *bmap,
357 struct list_head *listp)
359 if (bmap->b_ops->bop_lookup_dirty_buffers != NULL)
360 bmap->b_ops->bop_lookup_dirty_buffers(bmap, listp);
364 * nilfs_bmap_assign - assign a new block number to a block
366 * @bh: pointer to buffer head
367 * @blocknr: block number
368 * @binfo: block information
370 * Description: nilfs_bmap_assign() assigns the block number @blocknr to the
371 * buffer specified by @bh.
373 * Return Value: On success, 0 is returned and the buffer head of a newly
374 * create buffer and the block information associated with the buffer are
375 * stored in the place pointed by @bh and @binfo, respectively. On error, one
376 * of the following negative error codes is returned.
380 * %-ENOMEM - Insufficient amount of memory available.
382 int nilfs_bmap_assign(struct nilfs_bmap *bmap,
383 struct buffer_head **bh,
384 unsigned long blocknr,
385 union nilfs_binfo *binfo)
389 down_write(&bmap->b_sem);
390 ret = bmap->b_ops->bop_assign(bmap, bh, blocknr, binfo);
391 up_write(&bmap->b_sem);
393 return nilfs_bmap_convert_error(bmap, __func__, ret);
397 * nilfs_bmap_mark - mark block dirty
402 * Description: nilfs_bmap_mark() marks the block specified by @key and @level
405 * Return Value: On success, 0 is returned. On error, one of the following
406 * negative error codes is returned.
410 * %-ENOMEM - Insufficient amount of memory available.
412 int nilfs_bmap_mark(struct nilfs_bmap *bmap, __u64 key, int level)
416 if (bmap->b_ops->bop_mark == NULL)
419 down_write(&bmap->b_sem);
420 ret = bmap->b_ops->bop_mark(bmap, key, level);
421 up_write(&bmap->b_sem);
423 return nilfs_bmap_convert_error(bmap, __func__, ret);
427 * nilfs_bmap_test_and_clear_dirty - test and clear a bmap dirty state
430 * Description: nilfs_test_and_clear() is the atomic operation to test and
431 * clear the dirty state of @bmap.
433 * Return Value: 1 is returned if @bmap is dirty, or 0 if clear.
435 int nilfs_bmap_test_and_clear_dirty(struct nilfs_bmap *bmap)
439 down_write(&bmap->b_sem);
440 ret = nilfs_bmap_dirty(bmap);
441 nilfs_bmap_clear_dirty(bmap);
442 up_write(&bmap->b_sem);
450 __u64 nilfs_bmap_data_get_key(const struct nilfs_bmap *bmap,
451 const struct buffer_head *bh)
453 struct buffer_head *pbh;
456 key = page_index(bh->b_page) << (PAGE_SHIFT -
457 bmap->b_inode->i_blkbits);
458 for (pbh = page_buffers(bh->b_page); pbh != bh; pbh = pbh->b_this_page)
464 __u64 nilfs_bmap_find_target_seq(const struct nilfs_bmap *bmap, __u64 key)
468 diff = key - bmap->b_last_allocated_key;
469 if ((nilfs_bmap_keydiff_abs(diff) < NILFS_INODE_BMAP_SIZE) &&
470 (bmap->b_last_allocated_ptr != NILFS_BMAP_INVALID_PTR) &&
471 (bmap->b_last_allocated_ptr + diff > 0))
472 return bmap->b_last_allocated_ptr + diff;
474 return NILFS_BMAP_INVALID_PTR;
477 #define NILFS_BMAP_GROUP_DIV 8
478 __u64 nilfs_bmap_find_target_in_group(const struct nilfs_bmap *bmap)
480 struct inode *dat = nilfs_bmap_get_dat(bmap);
481 unsigned long entries_per_group = nilfs_palloc_entries_per_group(dat);
482 unsigned long group = bmap->b_inode->i_ino / entries_per_group;
484 return group * entries_per_group +
485 (bmap->b_inode->i_ino % NILFS_BMAP_GROUP_DIV) *
486 (entries_per_group / NILFS_BMAP_GROUP_DIV);
489 static struct lock_class_key nilfs_bmap_dat_lock_key;
490 static struct lock_class_key nilfs_bmap_mdt_lock_key;
493 * nilfs_bmap_read - read a bmap from an inode
495 * @raw_inode: on-disk inode
497 * Description: nilfs_bmap_read() initializes the bmap @bmap.
499 * Return Value: On success, 0 is returned. On error, the following negative
500 * error code is returned.
502 * %-ENOMEM - Insufficient amount of memory available.
504 int nilfs_bmap_read(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode)
506 if (raw_inode == NULL)
507 memset(bmap->b_u.u_data, 0, NILFS_BMAP_SIZE);
509 memcpy(bmap->b_u.u_data, raw_inode->i_bmap, NILFS_BMAP_SIZE);
511 init_rwsem(&bmap->b_sem);
513 bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode;
514 switch (bmap->b_inode->i_ino) {
516 bmap->b_ptr_type = NILFS_BMAP_PTR_P;
517 bmap->b_last_allocated_key = 0;
518 bmap->b_last_allocated_ptr = NILFS_BMAP_NEW_PTR_INIT;
519 lockdep_set_class(&bmap->b_sem, &nilfs_bmap_dat_lock_key);
521 case NILFS_CPFILE_INO:
522 case NILFS_SUFILE_INO:
523 bmap->b_ptr_type = NILFS_BMAP_PTR_VS;
524 bmap->b_last_allocated_key = 0;
525 bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
526 lockdep_set_class(&bmap->b_sem, &nilfs_bmap_mdt_lock_key);
528 case NILFS_IFILE_INO:
529 lockdep_set_class(&bmap->b_sem, &nilfs_bmap_mdt_lock_key);
532 bmap->b_ptr_type = NILFS_BMAP_PTR_VM;
533 bmap->b_last_allocated_key = 0;
534 bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
538 return (bmap->b_u.u_flags & NILFS_BMAP_LARGE) ?
539 nilfs_btree_init(bmap) : nilfs_direct_init(bmap);
543 * nilfs_bmap_write - write back a bmap to an inode
545 * @raw_inode: on-disk inode
547 * Description: nilfs_bmap_write() stores @bmap in @raw_inode.
549 void nilfs_bmap_write(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode)
551 down_write(&bmap->b_sem);
552 memcpy(raw_inode->i_bmap, bmap->b_u.u_data,
553 NILFS_INODE_BMAP_SIZE * sizeof(__le64));
554 if (bmap->b_inode->i_ino == NILFS_DAT_INO)
555 bmap->b_last_allocated_ptr = NILFS_BMAP_NEW_PTR_INIT;
557 up_write(&bmap->b_sem);
560 void nilfs_bmap_init_gc(struct nilfs_bmap *bmap)
562 memset(&bmap->b_u, 0, NILFS_BMAP_SIZE);
563 init_rwsem(&bmap->b_sem);
564 bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode;
565 bmap->b_ptr_type = NILFS_BMAP_PTR_U;
566 bmap->b_last_allocated_key = 0;
567 bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
569 nilfs_btree_init_gc(bmap);
572 void nilfs_bmap_save(const struct nilfs_bmap *bmap,
573 struct nilfs_bmap_store *store)
575 memcpy(store->data, bmap->b_u.u_data, sizeof(store->data));
576 store->last_allocated_key = bmap->b_last_allocated_key;
577 store->last_allocated_ptr = bmap->b_last_allocated_ptr;
578 store->state = bmap->b_state;
581 void nilfs_bmap_restore(struct nilfs_bmap *bmap,
582 const struct nilfs_bmap_store *store)
584 memcpy(bmap->b_u.u_data, store->data, sizeof(store->data));
585 bmap->b_last_allocated_key = store->last_allocated_key;
586 bmap->b_last_allocated_ptr = store->last_allocated_ptr;
587 bmap->b_state = store->state;