diff options
Diffstat (limited to 'fs/btrfs/disk-io.h')
| -rw-r--r-- | fs/btrfs/disk-io.h | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h new file mode 100644 index 000000000..e3b96944c --- /dev/null +++ b/fs/btrfs/disk-io.h @@ -0,0 +1,152 @@ +/* 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); +struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info, + u64 objectid, dev_t anon_dev); +struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info, + struct btrfs_path *path, + u64 objectid); + +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); +int btrfs_validate_metadata_buffer(struct btrfs_io_bio *io_bio, u64 phy_offset, + struct page *page, u64 start, u64 end, + int mirror); +blk_status_t btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio, + int mirror_num, unsigned long bio_flags); +#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 *)); +int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags); +int btrfs_find_free_objectid(struct btrfs_root *root, u64 *objectid); +int btrfs_find_highest_objectid(struct btrfs_root *root, u64 *objectid); +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 |