225 lines
8.0 KiB
C
225 lines
8.0 KiB
C
/*
|
|
* 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 "kernel-shared/ctree.h"
|
|
#include "kernel-lib/sizes.h"
|
|
|
|
#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),
|
|
|
|
/* For print-tree, print HIDDEN instead of filenames/xattrs/refs */
|
|
OPEN_CTREE_HIDE_NAMES = (1U << 14),
|
|
|
|
/*
|
|
* Allow certain commands like check/restore to ignore transid
|
|
* mismatch.
|
|
*/
|
|
OPEN_CTREE_ALLOW_TRANSID_MISMATCH = (1U << 15),
|
|
};
|
|
|
|
/*
|
|
* 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 open_ctree_flags {
|
|
const char *filename;
|
|
u64 sb_bytenr;
|
|
u64 root_tree_bytenr;
|
|
u64 chunk_tree_bytenr;
|
|
unsigned flags;
|
|
};
|
|
|
|
struct btrfs_fs_info *open_ctree_fs_info(struct open_ctree_flags *ocf);
|
|
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_check_super(struct btrfs_super_block *sb, unsigned sbflags);
|
|
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);
|
|
int btrfs_csum_data(struct btrfs_fs_info *fs_info, u16 csum_type, const u8 *data,
|
|
u8 *out, size_t len);
|
|
|
|
int btrfs_open_device(struct btrfs_device *dev);
|
|
int csum_tree_block_size(struct extent_buffer *buf, u16 csum_sectorsize,
|
|
int verify, u16 csum_type);
|
|
int verify_tree_block_csum_silent(struct extent_buffer *buf, u16 csum_size,
|
|
u16 csum_type);
|
|
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);
|
|
struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr);
|
|
struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_inf, u64 bytenr);
|
|
struct btrfs_root *btrfs_block_group_root(struct btrfs_fs_info *fs_info);
|
|
struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_key *key);
|
|
int btrfs_global_root_insert(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_root *root);
|
|
#endif
|