diff options
Diffstat (limited to 'disk-io.h')
| -rw-r--r-- | disk-io.h | 72 |
1 files changed, 50 insertions, 22 deletions
@@ -29,21 +29,29 @@ #define BTRFS_SUPER_MIRROR_SHIFT 12 enum btrfs_open_ctree_flags { - OPEN_CTREE_WRITES = (1 << 0), - OPEN_CTREE_PARTIAL = (1 << 1), - OPEN_CTREE_BACKUP_ROOT = (1 << 2), - OPEN_CTREE_RECOVER_SUPER = (1 << 3), - OPEN_CTREE_RESTORE = (1 << 4), - OPEN_CTREE_NO_BLOCK_GROUPS = (1 << 5), - OPEN_CTREE_EXCLUSIVE = (1 << 6), - OPEN_CTREE_NO_DEVICES = (1 << 7), + /* Open filesystem for writes */ + OPEN_CTREE_WRITES = (1U << 0), + /* Allow to open filesystem with some broken tree roots (eg log root) */ + OPEN_CTREE_PARTIAL = (1U << 1), + /* If primary root pinters are invalid, try backup copies */ + OPEN_CTREE_BACKUP_ROOT = (1U << 2), + /* Allow reading all superblock sopies if the primary is damaged */ + OPEN_CTREE_RECOVER_SUPER = (1U << 3), + /* Restoring filesystem image */ + OPEN_CTREE_RESTORE = (1U << 4), + /* Do not read block groups (extent tree) */ + OPEN_CTREE_NO_BLOCK_GROUPS = (1U << 5), + /* Open all devices in O_EXCL mode */ + OPEN_CTREE_EXCLUSIVE = (1U << 6), + /* Do not scan devices */ + OPEN_CTREE_NO_DEVICES = (1U << 7), /* * Don't print error messages if bytenr or checksums do not match in * tree block headers. Turn on by OPEN_CTREE_SUPPRESS_ERROR */ - OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS = (1 << 8), - /* Return chunk root */ - __OPEN_CTREE_RETURN_CHUNK_ROOT = (1 << 9), + OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS = (1U << 8), + /* Return the chunk root */ + __OPEN_CTREE_RETURN_CHUNK_ROOT = (1U << 9), OPEN_CTREE_CHUNK_ROOT_ONLY = OPEN_CTREE_PARTIAL + OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS + __OPEN_CTREE_RETURN_CHUNK_ROOT, @@ -53,15 +61,34 @@ enum btrfs_open_ctree_flags { * Like split PARTIAL into SKIP_CSUM/SKIP_EXTENT */ - OPEN_CTREE_IGNORE_FSID_MISMATCH = (1 << 10), + /* Ignore UUID mismatches */ + OPEN_CTREE_IGNORE_FSID_MISMATCH = (1U << 10), /* - * Allow open_ctree_fs_info() to return a incomplete fs_info with + * Allow open_ctree_fs_info() to return an incomplete fs_info with * system chunks from super block only. - * It's useful for chunk corruption case. + * It's useful when chunks are corrupted. * Makes no sense for open_ctree variants returning btrfs_root. */ - OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR = (1 << 11) + OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR = (1U << 11), + + /* Allow to open a partially created filesystem */ + OPEN_CTREE_FS_PARTIAL = (1U << 12), +}; + +/* + * Modes of superblock access + */ +enum btrfs_read_sb_flags { + SBREAD_DEFAULT = 0, + /* Reading superblock during recovery */ + SBREAD_RECOVER = (1 << 0), + + /* + * Read superblock with the fake signature, cannot be used with + * SBREAD_RECOVER + */ + SBREAD_PARTIAL = (1 << 1), }; static inline u64 btrfs_sb_offset(int mirror) @@ -103,27 +130,28 @@ void btrfs_free_fs_info(struct btrfs_fs_info *fs_info); struct btrfs_fs_info *btrfs_new_fs_info(int writable, u64 sb_bytenr); int btrfs_check_fs_compatibility(struct btrfs_super_block *sb, int writable); int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info, u64 root_tree_bytenr, - enum btrfs_open_ctree_flags flags); + unsigned flags); void btrfs_release_all_roots(struct btrfs_fs_info *fs_info); void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info); int btrfs_scan_fs_devices(int fd, const char *path, struct btrfs_fs_devices **fs_devices, u64 sb_bytenr, - int super_recover, int skip_devices); + unsigned sbflags, int skip_devices); int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info, u64 chunk_root_bytenr); struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, - enum btrfs_open_ctree_flags flags); + unsigned flags); struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr, - enum btrfs_open_ctree_flags flags); + unsigned flags); struct btrfs_fs_info *open_ctree_fs_info(const char *filename, u64 sb_bytenr, u64 root_tree_bytenr, u64 chunk_root_bytenr, - enum btrfs_open_ctree_flags flags); + unsigned flags); int close_ctree_fs_info(struct btrfs_fs_info *fs_info); static inline int close_ctree(struct btrfs_root *root) { - BUG_ON(!root); + if (!root) + return 0; return close_ctree_fs_info(root->fs_info); } @@ -131,7 +159,7 @@ int write_all_supers(struct btrfs_root *root); int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root *root); int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr, - int super_recover); + unsigned sbflags); int btrfs_map_bh_to_logical(struct btrfs_root *root, struct extent_buffer *bh, u64 logical); struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root, |