| /* |
| * Copyright (C) 2007 Oracle. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public |
| * License v2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public |
| * License along with this program; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 021110-1307, USA. |
| */ |
| |
| #ifndef __BTRFS_DISK_IO_H__ |
| #define __BTRFS_DISK_IO_H__ |
| |
| #include "kerncompat.h" |
| #include "ctree.h" |
| #include "sizes.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 |
| |
| enum btrfs_open_ctree_flags { |
| /* 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 copies 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 = (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, |
| /* |
| * TODO: cleanup: Split the open_ctree_flags into more independent |
| * Tree bits. |
| * Like split PARTIAL into SKIP_CSUM/SKIP_EXTENT |
| */ |
| |
| /* Ignore UUID mismatches */ |
| OPEN_CTREE_IGNORE_FSID_MISMATCH = (1U << 10), |
| |
| /* |
| * Allow open_ctree_fs_info() to return an incomplete fs_info with |
| * system chunks from super block only. |
| * It's useful when chunks are corrupted. |
| * Makes no sense for open_ctree variants returning btrfs_root. |
| */ |
| OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR = (1U << 11), |
| |
| /* |
| * Allow to open fs with temporary superblock (BTRFS_MAGIC_PARTIAL), |
| * such fs contains very basic tree layout, just able to be opened. |
| * Such temporary super is used for mkfs or convert. |
| */ |
| OPEN_CTREE_TEMPORARY_SUPER = (1U << 12), |
| |
| /* |
| * Invalidate the free space tree (i.e., clear the FREE_SPACE_TREE_VALID |
| * compat_ro bit). |
| */ |
| OPEN_CTREE_INVALIDATE_FST = (1U << 13), |
| }; |
| |
| /* |
| * 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_TEMPORARY = (1 << 1), |
| |
| /* |
| * Equivalent of OPEN_CTREE_IGNORE_FSID_MISMATCH, allow to read |
| * superblock that has mismatched sb::fsid and sb::dev_item.fsid |
| */ |
| SBREAD_IGNORE_FSID_MISMATCH = (1 << 2), |
| }; |
| |
| /* |
| * Use macro to define mirror super block position, |
| * so we can use it in static array initialization |
| */ |
| #define BTRFS_SB_MIRROR_OFFSET(mirror) ((u64)(SZ_16K) << \ |
| (BTRFS_SUPER_MIRROR_SHIFT * (mirror))) |
| |
| static inline u64 btrfs_sb_offset(int mirror) |
| { |
| if (mirror) |
| return BTRFS_SB_MIRROR_OFFSET(mirror); |
| return BTRFS_SUPER_INFO_OFFSET; |
| } |
| |
| struct btrfs_device; |
| |
| int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror); |
| struct extent_buffer* read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr, |
| u64 parent_transid); |
| |
| int read_extent_data(struct btrfs_fs_info *fs_info, char *data, u64 logical, |
| u64 *len, int mirror); |
| void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr, |
| u64 parent_transid); |
| struct extent_buffer* btrfs_find_create_tree_block( |
| struct btrfs_fs_info *fs_info, u64 bytenr); |
| |
| void btrfs_setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info, |
| u64 objectid); |
| int clean_tree_block(struct extent_buffer *buf); |
| |
| 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, |
| unsigned int flags); |
| int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info, u64 root_tree_bytenr, |
| 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, |
| 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, |
| unsigned flags); |
| struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr, |
| unsigned flags); |
| struct btrfs_fs_info *open_ctree_fs_info(const char *filename, |
| u64 sb_bytenr, u64 root_tree_bytenr, |
| u64 chunk_root_bytenr, |
| unsigned flags); |
| int close_ctree_fs_info(struct btrfs_fs_info *fs_info); |
| static inline int close_ctree(struct btrfs_root *root) |
| { |
| if (!root) |
| return 0; |
| return close_ctree_fs_info(root->fs_info); |
| } |
| |
| int write_all_supers(struct btrfs_fs_info *fs_info); |
| int write_ctree_super(struct btrfs_trans_handle *trans); |
| int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr, |
| 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_fs_info *fs_info, |
| u64 bytenr, u32 blocksize); |
| struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info, |
| struct btrfs_key *location); |
| struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info, |
| struct btrfs_key *location); |
| int btrfs_free_fs_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 btrfs_set_buffer_uptodate(struct extent_buffer *buf); |
| u32 btrfs_csum_data(char *data, u32 seed, size_t len); |
| void btrfs_csum_final(u32 crc, u8 *result); |
| |
| int btrfs_open_device(struct btrfs_device *dev); |
| int csum_tree_block_size(struct extent_buffer *buf, u16 csum_sectorsize, |
| int verify); |
| int verify_tree_block_csum_silent(struct extent_buffer *buf, u16 csum_size); |
| int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid); |
| int write_tree_block(struct btrfs_trans_handle *trans, |
| struct btrfs_fs_info *fs_info, |
| struct extent_buffer *eb); |
| int write_and_map_eb(struct btrfs_fs_info *fs_info, struct extent_buffer *eb); |
| int btrfs_fs_roots_compare_roots(struct rb_node *node1, struct rb_node *node2); |
| struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans, |
| struct btrfs_fs_info *fs_info, |
| u64 objectid); |
| |
| #endif |