| /* |
| * 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__ |
| |
| #define BTRFS_SUPER_INFO_OFFSET (64 * 1024) |
| #define BTRFS_SUPER_INFO_SIZE 4096 |
| |
| #define BTRFS_SUPER_MIRROR_MAX 3 |
| #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), |
| /* |
| * 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_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 indepent |
| * tree bits. |
| * Like split PARTIAL into SKIP_CSUM/SKIP_EXTENT |
| */ |
| }; |
| |
| static inline u64 btrfs_sb_offset(int mirror) |
| { |
| u64 start = 16 * 1024; |
| if (mirror) |
| return start << (BTRFS_SUPER_MIRROR_SHIFT * 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_root *root, u64 bytenr, |
| u32 blocksize, u64 parent_transid); |
| void readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize, |
| u64 parent_transid); |
| struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root, |
| u64 bytenr, u32 blocksize); |
| |
| int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, |
| u32 stripesize, struct btrfs_root *root, |
| struct btrfs_fs_info *fs_info, u64 objectid); |
| int clean_tree_block(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, 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, int writable); |
| int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info, u64 root_tree_bytenr, |
| enum btrfs_open_ctree_flags 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); |
| int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info); |
| |
| struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, |
| enum btrfs_open_ctree_flags flags); |
| struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr, |
| enum btrfs_open_ctree_flags flags); |
| struct btrfs_fs_info *open_ctree_fs_info(const char *filename, |
| u64 sb_bytenr, u64 root_tree_bytenr, |
| enum btrfs_open_ctree_flags flags); |
| int close_ctree(struct btrfs_root *root); |
| 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); |
| 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, |
| 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); |
| int wait_on_tree_block_writeback(struct btrfs_root *root, |
| struct extent_buffer *buf); |
| u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len); |
| void btrfs_csum_final(u32 crc, char *result); |
| |
| int btrfs_commit_transaction(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root); |
| 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_and_map_eb(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
| struct extent_buffer *eb); |
| |
| /* raid6.c */ |
| void raid6_gen_syndrome(int disks, size_t bytes, void **ptrs); |
| |
| #endif |