X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=disk-io.h;h=c4496155771f6d988d7630ac739c6740899d8445;hb=e181c03d420ef36c8bedd86492dc5c7b229be8a9;hp=b5dee2fae4daa6297355687a30205f592a9ef493;hpb=a71a25da6968d3b681a04f5f9289a2ea4e192a79;p=platform%2Fupstream%2Fbtrfs-progs.git diff --git a/disk-io.h b/disk-io.h index b5dee2f..c449615 100644 --- a/disk-io.h +++ b/disk-io.h @@ -1,30 +1,197 @@ -#ifndef __DISKIO__ -#define __DISKIO__ -#include "list.h" - -struct tree_buffer { - u64 blocknr; - int count; - union { - struct node node; - struct leaf leaf; - }; - struct list_head dirty; - struct list_head cache; +/* + * 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 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 = (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), }; -struct tree_buffer *read_tree_block(struct ctree_root *root, u64 blocknr); -struct tree_buffer *find_tree_block(struct ctree_root *root, u64 blocknr); -int write_tree_block(struct ctree_root *root, struct tree_buffer *buf); -int dirty_tree_block(struct ctree_root *root, struct tree_buffer *buf); -int clean_tree_block(struct ctree_root *root, struct tree_buffer *buf); -int commit_transaction(struct ctree_root *root); -struct ctree_root *open_ctree(char *filename, struct ctree_super_block *s); -int close_ctree(struct ctree_root *root); -void tree_block_release(struct ctree_root *root, struct tree_buffer *buf); -int write_ctree_super(struct ctree_root *root, struct ctree_super_block *s); -int mkfs(int fd); - -#define CTREE_SUPER_INFO_OFFSET(bs) (16 * (bs)) +/* + * 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), +}; + +/* + * 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 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, + 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, + struct btrfs_fs_info *fs_info); +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); #endif