forked from Mirrors/btrfs-progs
207 lines
7.3 KiB
C
207 lines
7.3 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef __BTRFS_DISK_IO_H__
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#define __BTRFS_DISK_IO_H__
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#include "kerncompat.h"
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#include "ctree.h"
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#include "kernel-lib/sizes.h"
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#define BTRFS_SUPER_INFO_OFFSET SZ_64K
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#define BTRFS_SUPER_INFO_SIZE 4096
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#define BTRFS_SUPER_MIRROR_MAX 3
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#define BTRFS_SUPER_MIRROR_SHIFT 12
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enum btrfs_open_ctree_flags {
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/* Open filesystem for writes */
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OPEN_CTREE_WRITES = (1U << 0),
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/* Allow to open filesystem with some broken tree roots (eg log root) */
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OPEN_CTREE_PARTIAL = (1U << 1),
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/* If primary root pinters are invalid, try backup copies */
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OPEN_CTREE_BACKUP_ROOT = (1U << 2),
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/* Allow reading all superblock copies if the primary is damaged */
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OPEN_CTREE_RECOVER_SUPER = (1U << 3),
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/* Restoring filesystem image */
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OPEN_CTREE_RESTORE = (1U << 4),
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/* Do not read block groups (extent tree) */
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OPEN_CTREE_NO_BLOCK_GROUPS = (1U << 5),
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/* Open all devices in O_EXCL mode */
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OPEN_CTREE_EXCLUSIVE = (1U << 6),
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/* Do not scan devices */
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OPEN_CTREE_NO_DEVICES = (1U << 7),
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/*
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* Don't print error messages if bytenr or checksums do not match in
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* tree block headers. Turn on by OPEN_CTREE_SUPPRESS_ERROR
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*/
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OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS = (1U << 8),
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/* Return the chunk root */
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__OPEN_CTREE_RETURN_CHUNK_ROOT = (1U << 9),
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OPEN_CTREE_CHUNK_ROOT_ONLY = OPEN_CTREE_PARTIAL +
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OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS +
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__OPEN_CTREE_RETURN_CHUNK_ROOT,
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/*
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* TODO: cleanup: Split the open_ctree_flags into more independent
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* Tree bits.
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* Like split PARTIAL into SKIP_CSUM/SKIP_EXTENT
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*/
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/* Ignore UUID mismatches */
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OPEN_CTREE_IGNORE_FSID_MISMATCH = (1U << 10),
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/*
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* Allow open_ctree_fs_info() to return an incomplete fs_info with
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* system chunks from super block only.
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* It's useful when chunks are corrupted.
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* Makes no sense for open_ctree variants returning btrfs_root.
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*/
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OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR = (1U << 11),
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/*
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* Allow to open fs with temporary superblock (BTRFS_MAGIC_PARTIAL),
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* such fs contains very basic tree layout, just able to be opened.
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* Such temporary super is used for mkfs or convert.
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*/
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OPEN_CTREE_TEMPORARY_SUPER = (1U << 12),
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/*
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* Invalidate the free space tree (i.e., clear the FREE_SPACE_TREE_VALID
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* compat_ro bit).
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*/
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OPEN_CTREE_INVALIDATE_FST = (1U << 13),
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};
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/*
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* Modes of superblock access
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*/
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enum btrfs_read_sb_flags {
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SBREAD_DEFAULT = 0,
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/* Reading superblock during recovery */
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SBREAD_RECOVER = (1 << 0),
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/*
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* Read superblock with the fake signature, cannot be used with
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* SBREAD_RECOVER
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*/
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SBREAD_TEMPORARY = (1 << 1),
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/*
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* Equivalent of OPEN_CTREE_IGNORE_FSID_MISMATCH, allow to read
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* superblock that has mismatched sb::fsid and sb::dev_item.fsid
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*/
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SBREAD_IGNORE_FSID_MISMATCH = (1 << 2),
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};
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/*
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* Use macro to define mirror super block position,
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* so we can use it in static array initialization
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*/
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#define BTRFS_SB_MIRROR_OFFSET(mirror) ((u64)(SZ_16K) << \
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(BTRFS_SUPER_MIRROR_SHIFT * (mirror)))
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static inline u64 btrfs_sb_offset(int mirror)
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{
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if (mirror)
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return BTRFS_SB_MIRROR_OFFSET(mirror);
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return BTRFS_SUPER_INFO_OFFSET;
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}
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struct btrfs_device;
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int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror);
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struct extent_buffer* read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
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u64 parent_transid);
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int read_extent_data(struct btrfs_fs_info *fs_info, char *data, u64 logical,
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u64 *len, int mirror);
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void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
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u64 parent_transid);
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struct extent_buffer* btrfs_find_create_tree_block(
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struct btrfs_fs_info *fs_info, u64 bytenr);
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void btrfs_setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
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u64 objectid);
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int clean_tree_block(struct extent_buffer *buf);
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void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
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struct btrfs_fs_info *btrfs_new_fs_info(int writable, u64 sb_bytenr);
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int btrfs_check_fs_compatibility(struct btrfs_super_block *sb,
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unsigned int flags);
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int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info, u64 root_tree_bytenr,
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unsigned flags);
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void btrfs_release_all_roots(struct btrfs_fs_info *fs_info);
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void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info);
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int btrfs_scan_fs_devices(int fd, const char *path,
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struct btrfs_fs_devices **fs_devices, u64 sb_bytenr,
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unsigned sbflags, int skip_devices);
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int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info,
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u64 chunk_root_bytenr);
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struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr,
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unsigned flags);
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struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
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unsigned flags);
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struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
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u64 sb_bytenr, u64 root_tree_bytenr,
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u64 chunk_root_bytenr,
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unsigned flags);
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int close_ctree_fs_info(struct btrfs_fs_info *fs_info);
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static inline int close_ctree(struct btrfs_root *root)
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{
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if (!root)
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return 0;
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return close_ctree_fs_info(root->fs_info);
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}
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int write_all_supers(struct btrfs_fs_info *fs_info);
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int write_ctree_super(struct btrfs_trans_handle *trans);
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int btrfs_check_super(struct btrfs_super_block *sb, unsigned sbflags);
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int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr,
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unsigned sbflags);
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int btrfs_map_bh_to_logical(struct btrfs_root *root, struct extent_buffer *bh,
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u64 logical);
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struct extent_buffer *btrfs_find_tree_block(struct btrfs_fs_info *fs_info,
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u64 bytenr, u32 blocksize);
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struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
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struct btrfs_key *location);
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struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
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struct btrfs_key *location);
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int btrfs_free_fs_root(struct btrfs_root *root);
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void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
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int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);
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int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
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int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len);
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int btrfs_open_device(struct btrfs_device *dev);
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int csum_tree_block_size(struct extent_buffer *buf, u16 csum_sectorsize,
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int verify, u16 csum_type);
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int verify_tree_block_csum_silent(struct extent_buffer *buf, u16 csum_size,
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u16 csum_type);
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int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
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int write_tree_block(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info,
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struct extent_buffer *eb);
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int write_and_map_eb(struct btrfs_fs_info *fs_info, struct extent_buffer *eb);
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int btrfs_fs_roots_compare_roots(struct rb_node *node1, struct rb_node *node2);
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struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info,
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u64 objectid);
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#endif
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