mirror of
https://github.com/torvalds/linux.git
synced 2024-11-27 06:31:52 +00:00
56e9357a1e
The main function to lookup a root by its id btrfs_get_fs_root takes the whole key, while only using the objectid. The value of offset is preset to (u64)-1 but not actually used until btrfs_find_root that does the actual search. Switch btrfs_get_fs_root to use only objectid and remove all local variables that existed just for the lookup. The actual key for search is set up in btrfs_get_fs_root, reusing another key variable. Signed-off-by: David Sterba <dsterba@suse.com>
145 lines
5.0 KiB
C
145 lines
5.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Copyright (C) 2007 Oracle. All rights reserved.
|
|
*/
|
|
|
|
#ifndef BTRFS_DISK_IO_H
|
|
#define BTRFS_DISK_IO_H
|
|
|
|
#define BTRFS_SUPER_INFO_OFFSET SZ_64K
|
|
#define BTRFS_SUPER_INFO_SIZE 4096
|
|
|
|
#define BTRFS_SUPER_MIRROR_MAX 3
|
|
#define BTRFS_SUPER_MIRROR_SHIFT 12
|
|
|
|
/*
|
|
* Fixed blocksize for all devices, applies to specific ways of reading
|
|
* metadata like superblock. Must meet the set_blocksize requirements.
|
|
*
|
|
* Do not change.
|
|
*/
|
|
#define BTRFS_BDEV_BLOCKSIZE (4096)
|
|
|
|
enum btrfs_wq_endio_type {
|
|
BTRFS_WQ_ENDIO_DATA,
|
|
BTRFS_WQ_ENDIO_METADATA,
|
|
BTRFS_WQ_ENDIO_FREE_SPACE,
|
|
BTRFS_WQ_ENDIO_RAID56,
|
|
};
|
|
|
|
static inline u64 btrfs_sb_offset(int mirror)
|
|
{
|
|
u64 start = SZ_16K;
|
|
if (mirror)
|
|
return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
|
|
return BTRFS_SUPER_INFO_OFFSET;
|
|
}
|
|
|
|
struct btrfs_device;
|
|
struct btrfs_fs_devices;
|
|
|
|
void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info);
|
|
void btrfs_init_fs_info(struct btrfs_fs_info *fs_info);
|
|
int btrfs_verify_level_key(struct extent_buffer *eb, int level,
|
|
struct btrfs_key *first_key, u64 parent_transid);
|
|
struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
|
|
u64 parent_transid, int level,
|
|
struct btrfs_key *first_key);
|
|
void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr);
|
|
struct extent_buffer *btrfs_find_create_tree_block(
|
|
struct btrfs_fs_info *fs_info,
|
|
u64 bytenr);
|
|
void btrfs_clean_tree_block(struct extent_buffer *buf);
|
|
int __cold open_ctree(struct super_block *sb,
|
|
struct btrfs_fs_devices *fs_devices,
|
|
char *options);
|
|
void __cold close_ctree(struct btrfs_fs_info *fs_info);
|
|
int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
|
|
struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev);
|
|
struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
|
|
int copy_num);
|
|
int btrfs_commit_super(struct btrfs_fs_info *fs_info);
|
|
struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
|
|
struct btrfs_key *key);
|
|
int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_root *root);
|
|
void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
|
|
|
|
struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
|
|
u64 objectid, bool check_ref);
|
|
|
|
void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
|
|
int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
|
|
void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
|
|
void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
|
|
void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_root *root);
|
|
|
|
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
|
|
struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
|
|
#endif
|
|
|
|
/*
|
|
* This function is used to grab the root, and avoid it is freed when we
|
|
* access it. But it doesn't ensure that the tree is not dropped.
|
|
*
|
|
* If you want to ensure the whole tree is safe, you should use
|
|
* fs_info->subvol_srcu
|
|
*/
|
|
static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)
|
|
{
|
|
if (!root)
|
|
return NULL;
|
|
if (refcount_inc_not_zero(&root->refs))
|
|
return root;
|
|
return NULL;
|
|
}
|
|
|
|
void btrfs_put_root(struct btrfs_root *root);
|
|
void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
|
|
int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
|
|
int atomic);
|
|
int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level,
|
|
struct btrfs_key *first_key);
|
|
blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
|
|
enum btrfs_wq_endio_type metadata);
|
|
blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
|
|
int mirror_num, unsigned long bio_flags,
|
|
u64 bio_offset, void *private_data,
|
|
extent_submit_bio_start_t *submit_bio_start);
|
|
blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio,
|
|
int mirror_num);
|
|
int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info);
|
|
int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root);
|
|
void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
|
|
struct btrfs_fs_info *fs_info);
|
|
void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
|
|
struct btrfs_fs_info *fs_info);
|
|
struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
|
|
u64 objectid);
|
|
int btree_lock_page_hook(struct page *page, void *data,
|
|
void (*flush_fn)(void *));
|
|
struct extent_map *btree_get_extent(struct btrfs_inode *inode,
|
|
struct page *page, size_t pg_offset,
|
|
u64 start, u64 len);
|
|
int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
|
|
int __init btrfs_end_io_wq_init(void);
|
|
void __cold btrfs_end_io_wq_exit(void);
|
|
|
|
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
|
void btrfs_init_lockdep(void);
|
|
void btrfs_set_buffer_lockdep_class(u64 objectid,
|
|
struct extent_buffer *eb, int level);
|
|
#else
|
|
static inline void btrfs_init_lockdep(void)
|
|
{ }
|
|
static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
|
|
struct extent_buffer *eb, int level)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#endif
|