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Diffstat (limited to '')
| -rw-r--r-- | fs/btrfs/disk-io.h | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h new file mode 100644 index 000000000..7a4a60f26 --- /dev/null +++ b/fs/btrfs/disk-io.h @@ -0,0 +1,164 @@ +/* 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 = 0, + BTRFS_WQ_ENDIO_METADATA = 1, + BTRFS_WQ_ENDIO_FREE_SPACE = 2, + BTRFS_WQ_ENDIO_RAID56 = 3, + BTRFS_WQ_ENDIO_DIO_REPAIR = 4, +}; + +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; + +int btrfs_verify_level_key(struct btrfs_fs_info *fs_info, + 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); +int reada_tree_block_flagged(struct btrfs_fs_info *fs_info, u64 bytenr, + int mirror_num, struct extent_buffer **eb); +struct extent_buffer *btrfs_find_create_tree_block( + struct btrfs_fs_info *fs_info, + u64 bytenr); +void clean_tree_block(struct btrfs_fs_info *fs_info, struct extent_buffer *buf); +int open_ctree(struct super_block *sb, + struct btrfs_fs_devices *fs_devices, + char *options); +void close_ctree(struct btrfs_fs_info *fs_info); +int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors); +struct buffer_head *btrfs_read_dev_super(struct block_device *bdev); +int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num, + struct buffer_head **bh_ret); +int btrfs_commit_super(struct btrfs_fs_info *fs_info); +struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root, + struct btrfs_key *location); +int btrfs_init_fs_root(struct btrfs_root *root); +struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info, + u64 root_id); +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, + struct btrfs_key *key, + bool check_ref); +static inline struct btrfs_root * +btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info, + struct btrfs_key *location) +{ + return btrfs_get_fs_root(fs_info, location, true); +} + +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); +void btrfs_free_fs_root(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_fs_root(struct btrfs_root *root) +{ + if (refcount_inc_not_zero(&root->refs)) + return root; + return NULL; +} + +static inline void btrfs_put_fs_root(struct btrfs_root *root) +{ + if (refcount_dec_and_test(&root->refs)) + kfree(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); +u32 btrfs_csum_data(const char *data, u32 seed, size_t len); +void btrfs_csum_final(u32 crc, u8 *result); +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_write_tree_block(struct extent_buffer *buf); +void btrfs_wait_tree_block_writeback(struct extent_buffer *buf); +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, + struct btrfs_fs_info *fs_info, + 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 create); +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 |