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);
71 ret = nilfs_bmap_convert_error(bmap, __func__, ret);
74 if (NILFS_BMAP_USE_VBN(bmap)) {
75 ret = nilfs_dat_translate(nilfs_bmap_get_dat(bmap), *ptrp,
82 up_read(&bmap->b_sem);
86 int nilfs_bmap_lookup_contig(struct nilfs_bmap *bmap, __u64 key, __u64 *ptrp,
87 unsigned int maxblocks)
91 down_read(&bmap->b_sem);
92 ret = bmap->b_ops->bop_lookup_contig(bmap, key, ptrp, maxblocks);
93 up_read(&bmap->b_sem);
95 return nilfs_bmap_convert_error(bmap, __func__, ret);
98 static int nilfs_bmap_do_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr)
100 __u64 keys[NILFS_BMAP_SMALL_HIGH + 1];
101 __u64 ptrs[NILFS_BMAP_SMALL_HIGH + 1];
104 if (bmap->b_ops->bop_check_insert != NULL) {
105 ret = bmap->b_ops->bop_check_insert(bmap, key);
107 n = bmap->b_ops->bop_gather_data(
108 bmap, keys, ptrs, NILFS_BMAP_SMALL_HIGH + 1);
111 ret = nilfs_btree_convert_and_insert(
112 bmap, key, ptr, keys, ptrs, n);
114 bmap->b_u.u_flags |= NILFS_BMAP_LARGE;
121 return bmap->b_ops->bop_insert(bmap, key, ptr);
125 * nilfs_bmap_insert - insert a new key-record pair into a bmap
130 * Description: nilfs_bmap_insert() inserts the new key-record pair specified
131 * by @key and @rec into @bmap.
133 * Return Value: On success, 0 is returned. On error, one of the following
134 * negative error codes is returned.
138 * %-ENOMEM - Insufficient amount of memory available.
140 * %-EEXIST - A record associated with @key already exist.
142 int nilfs_bmap_insert(struct nilfs_bmap *bmap, __u64 key, unsigned long rec)
146 down_write(&bmap->b_sem);
147 ret = nilfs_bmap_do_insert(bmap, key, rec);
148 up_write(&bmap->b_sem);
150 return nilfs_bmap_convert_error(bmap, __func__, ret);
153 static int nilfs_bmap_do_delete(struct nilfs_bmap *bmap, __u64 key)
155 __u64 keys[NILFS_BMAP_LARGE_LOW + 1];
156 __u64 ptrs[NILFS_BMAP_LARGE_LOW + 1];
159 if (bmap->b_ops->bop_check_delete != NULL) {
160 ret = bmap->b_ops->bop_check_delete(bmap, key);
162 n = bmap->b_ops->bop_gather_data(
163 bmap, keys, ptrs, NILFS_BMAP_LARGE_LOW + 1);
166 ret = nilfs_direct_delete_and_convert(
167 bmap, key, keys, ptrs, n);
169 bmap->b_u.u_flags &= ~NILFS_BMAP_LARGE;
176 return bmap->b_ops->bop_delete(bmap, key);
180 * nilfs_bmap_seek_key - seek a valid entry and return its key
182 * @start: start key number
183 * @keyp: place to store valid key
185 * Description: nilfs_bmap_seek_key() seeks a valid key on @bmap
186 * starting from @start, and stores it to @keyp if found.
188 * Return Value: On success, 0 is returned. On error, one of the following
189 * negative error codes is returned.
193 * %-ENOMEM - Insufficient amount of memory available.
195 * %-ENOENT - No valid entry was found
197 int nilfs_bmap_seek_key(struct nilfs_bmap *bmap, __u64 start, __u64 *keyp)
201 down_read(&bmap->b_sem);
202 ret = bmap->b_ops->bop_seek_key(bmap, start, keyp);
203 up_read(&bmap->b_sem);
206 ret = nilfs_bmap_convert_error(bmap, __func__, ret);
210 int nilfs_bmap_last_key(struct nilfs_bmap *bmap, __u64 *keyp)
214 down_read(&bmap->b_sem);
215 ret = bmap->b_ops->bop_last_key(bmap, keyp);
216 up_read(&bmap->b_sem);
219 ret = nilfs_bmap_convert_error(bmap, __func__, ret);
224 * nilfs_bmap_delete - delete a key-record pair from a bmap
228 * Description: nilfs_bmap_delete() deletes the key-record pair specified by
231 * Return Value: On success, 0 is returned. On error, one of the following
232 * negative error codes is returned.
236 * %-ENOMEM - Insufficient amount of memory available.
238 * %-ENOENT - A record associated with @key does not exist.
240 int nilfs_bmap_delete(struct nilfs_bmap *bmap, __u64 key)
244 down_write(&bmap->b_sem);
245 ret = nilfs_bmap_do_delete(bmap, key);
246 up_write(&bmap->b_sem);
248 return nilfs_bmap_convert_error(bmap, __func__, ret);
251 static int nilfs_bmap_do_truncate(struct nilfs_bmap *bmap, __u64 key)
256 ret = bmap->b_ops->bop_last_key(bmap, &lastkey);
263 while (key <= lastkey) {
264 ret = nilfs_bmap_do_delete(bmap, lastkey);
267 ret = bmap->b_ops->bop_last_key(bmap, &lastkey);
278 * nilfs_bmap_truncate - truncate a bmap to a specified key
282 * Description: nilfs_bmap_truncate() removes key-record pairs whose keys are
283 * greater than or equal to @key from @bmap.
285 * Return Value: On success, 0 is returned. On error, one of the following
286 * negative error codes is returned.
290 * %-ENOMEM - Insufficient amount of memory available.
292 int nilfs_bmap_truncate(struct nilfs_bmap *bmap, __u64 key)
296 down_write(&bmap->b_sem);
297 ret = nilfs_bmap_do_truncate(bmap, key);
298 up_write(&bmap->b_sem);
300 return nilfs_bmap_convert_error(bmap, __func__, ret);
304 * nilfs_bmap_clear - free resources a bmap holds
307 * Description: nilfs_bmap_clear() frees resources associated with @bmap.
309 void nilfs_bmap_clear(struct nilfs_bmap *bmap)
311 down_write(&bmap->b_sem);
312 if (bmap->b_ops->bop_clear != NULL)
313 bmap->b_ops->bop_clear(bmap);
314 up_write(&bmap->b_sem);
318 * nilfs_bmap_propagate - propagate dirty state
322 * Description: nilfs_bmap_propagate() marks the buffers that directly or
323 * indirectly refer to the block specified by @bh dirty.
325 * Return Value: On success, 0 is returned. On error, one of the following
326 * negative error codes is returned.
330 * %-ENOMEM - Insufficient amount of memory available.
332 int nilfs_bmap_propagate(struct nilfs_bmap *bmap, struct buffer_head *bh)
336 down_write(&bmap->b_sem);
337 ret = bmap->b_ops->bop_propagate(bmap, bh);
338 up_write(&bmap->b_sem);
340 return nilfs_bmap_convert_error(bmap, __func__, ret);
344 * nilfs_bmap_lookup_dirty_buffers -
346 * @listp: pointer to buffer head list
348 void nilfs_bmap_lookup_dirty_buffers(struct nilfs_bmap *bmap,
349 struct list_head *listp)
351 if (bmap->b_ops->bop_lookup_dirty_buffers != NULL)
352 bmap->b_ops->bop_lookup_dirty_buffers(bmap, listp);
356 * nilfs_bmap_assign - assign a new block number to a block
358 * @bh: pointer to buffer head
359 * @blocknr: block number
360 * @binfo: block information
362 * Description: nilfs_bmap_assign() assigns the block number @blocknr to the
363 * buffer specified by @bh.
365 * Return Value: On success, 0 is returned and the buffer head of a newly
366 * create buffer and the block information associated with the buffer are
367 * stored in the place pointed by @bh and @binfo, respectively. On error, one
368 * of the following negative error codes is returned.
372 * %-ENOMEM - Insufficient amount of memory available.
374 int nilfs_bmap_assign(struct nilfs_bmap *bmap,
375 struct buffer_head **bh,
376 unsigned long blocknr,
377 union nilfs_binfo *binfo)
381 down_write(&bmap->b_sem);
382 ret = bmap->b_ops->bop_assign(bmap, bh, blocknr, binfo);
383 up_write(&bmap->b_sem);
385 return nilfs_bmap_convert_error(bmap, __func__, ret);
389 * nilfs_bmap_mark - mark block dirty
394 * Description: nilfs_bmap_mark() marks the block specified by @key and @level
397 * Return Value: On success, 0 is returned. On error, one of the following
398 * negative error codes is returned.
402 * %-ENOMEM - Insufficient amount of memory available.
404 int nilfs_bmap_mark(struct nilfs_bmap *bmap, __u64 key, int level)
408 if (bmap->b_ops->bop_mark == NULL)
411 down_write(&bmap->b_sem);
412 ret = bmap->b_ops->bop_mark(bmap, key, level);
413 up_write(&bmap->b_sem);
415 return nilfs_bmap_convert_error(bmap, __func__, ret);
419 * nilfs_bmap_test_and_clear_dirty - test and clear a bmap dirty state
422 * Description: nilfs_test_and_clear() is the atomic operation to test and
423 * clear the dirty state of @bmap.
425 * Return Value: 1 is returned if @bmap is dirty, or 0 if clear.
427 int nilfs_bmap_test_and_clear_dirty(struct nilfs_bmap *bmap)
431 down_write(&bmap->b_sem);
432 ret = nilfs_bmap_dirty(bmap);
433 nilfs_bmap_clear_dirty(bmap);
434 up_write(&bmap->b_sem);
442 __u64 nilfs_bmap_data_get_key(const struct nilfs_bmap *bmap,
443 const struct buffer_head *bh)
445 struct buffer_head *pbh;
448 key = page_index(bh->b_page) << (PAGE_SHIFT -
449 bmap->b_inode->i_blkbits);
450 for (pbh = page_buffers(bh->b_page); pbh != bh; pbh = pbh->b_this_page)
456 __u64 nilfs_bmap_find_target_seq(const struct nilfs_bmap *bmap, __u64 key)
460 diff = key - bmap->b_last_allocated_key;
461 if ((nilfs_bmap_keydiff_abs(diff) < NILFS_INODE_BMAP_SIZE) &&
462 (bmap->b_last_allocated_ptr != NILFS_BMAP_INVALID_PTR) &&
463 (bmap->b_last_allocated_ptr + diff > 0))
464 return bmap->b_last_allocated_ptr + diff;
466 return NILFS_BMAP_INVALID_PTR;
469 #define NILFS_BMAP_GROUP_DIV 8
470 __u64 nilfs_bmap_find_target_in_group(const struct nilfs_bmap *bmap)
472 struct inode *dat = nilfs_bmap_get_dat(bmap);
473 unsigned long entries_per_group = nilfs_palloc_entries_per_group(dat);
474 unsigned long group = bmap->b_inode->i_ino / entries_per_group;
476 return group * entries_per_group +
477 (bmap->b_inode->i_ino % NILFS_BMAP_GROUP_DIV) *
478 (entries_per_group / NILFS_BMAP_GROUP_DIV);
481 static struct lock_class_key nilfs_bmap_dat_lock_key;
482 static struct lock_class_key nilfs_bmap_mdt_lock_key;
485 * nilfs_bmap_read - read a bmap from an inode
487 * @raw_inode: on-disk inode
489 * Description: nilfs_bmap_read() initializes the bmap @bmap.
491 * Return Value: On success, 0 is returned. On error, the following negative
492 * error code is returned.
494 * %-ENOMEM - Insufficient amount of memory available.
496 int nilfs_bmap_read(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode)
498 if (raw_inode == NULL)
499 memset(bmap->b_u.u_data, 0, NILFS_BMAP_SIZE);
501 memcpy(bmap->b_u.u_data, raw_inode->i_bmap, NILFS_BMAP_SIZE);
503 init_rwsem(&bmap->b_sem);
505 bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode;
506 switch (bmap->b_inode->i_ino) {
508 bmap->b_ptr_type = NILFS_BMAP_PTR_P;
509 bmap->b_last_allocated_key = 0;
510 bmap->b_last_allocated_ptr = NILFS_BMAP_NEW_PTR_INIT;
511 lockdep_set_class(&bmap->b_sem, &nilfs_bmap_dat_lock_key);
513 case NILFS_CPFILE_INO:
514 case NILFS_SUFILE_INO:
515 bmap->b_ptr_type = NILFS_BMAP_PTR_VS;
516 bmap->b_last_allocated_key = 0;
517 bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
518 lockdep_set_class(&bmap->b_sem, &nilfs_bmap_mdt_lock_key);
520 case NILFS_IFILE_INO:
521 lockdep_set_class(&bmap->b_sem, &nilfs_bmap_mdt_lock_key);
524 bmap->b_ptr_type = NILFS_BMAP_PTR_VM;
525 bmap->b_last_allocated_key = 0;
526 bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
530 return (bmap->b_u.u_flags & NILFS_BMAP_LARGE) ?
531 nilfs_btree_init(bmap) : nilfs_direct_init(bmap);
535 * nilfs_bmap_write - write back a bmap to an inode
537 * @raw_inode: on-disk inode
539 * Description: nilfs_bmap_write() stores @bmap in @raw_inode.
541 void nilfs_bmap_write(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode)
543 down_write(&bmap->b_sem);
544 memcpy(raw_inode->i_bmap, bmap->b_u.u_data,
545 NILFS_INODE_BMAP_SIZE * sizeof(__le64));
546 if (bmap->b_inode->i_ino == NILFS_DAT_INO)
547 bmap->b_last_allocated_ptr = NILFS_BMAP_NEW_PTR_INIT;
549 up_write(&bmap->b_sem);
552 void nilfs_bmap_init_gc(struct nilfs_bmap *bmap)
554 memset(&bmap->b_u, 0, NILFS_BMAP_SIZE);
555 init_rwsem(&bmap->b_sem);
556 bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode;
557 bmap->b_ptr_type = NILFS_BMAP_PTR_U;
558 bmap->b_last_allocated_key = 0;
559 bmap->b_last_allocated_ptr = NILFS_BMAP_INVALID_PTR;
561 nilfs_btree_init_gc(bmap);
564 void nilfs_bmap_save(const struct nilfs_bmap *bmap,
565 struct nilfs_bmap_store *store)
567 memcpy(store->data, bmap->b_u.u_data, sizeof(store->data));
568 store->last_allocated_key = bmap->b_last_allocated_key;
569 store->last_allocated_ptr = bmap->b_last_allocated_ptr;
570 store->state = bmap->b_state;
573 void nilfs_bmap_restore(struct nilfs_bmap *bmap,
574 const struct nilfs_bmap_store *store)
576 memcpy(bmap->b_u.u_data, store->data, sizeof(store->data));
577 bmap->b_last_allocated_key = store->last_allocated_key;
578 bmap->b_last_allocated_ptr = store->last_allocated_ptr;
579 bmap->b_state = store->state;