2ff04db5f4
The filesystem existence on a device is manifested by the signature, during the mkfs process we write it first and then create other structures. Such filesystem is not valid and should not be registered during device scan nor listed among devices from blkid. This patch will introduce two staged creation. In the first phase, the signature is wrong, but recognized as a partially created filesystem (by open or scan helpers). Once we successfully create and write everything, we fixup the signature. At this point automated scanning should find a valid filesystem on all devices. We can also rely on the partially created filesystem to do better error handling during creation. We can just bail out and do not need to clean up. The partial signature is '!BHRfS_M', can be shown by btrfs inspect-internal dump-super -F image Reviewed-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
188 lines
6.7 KiB
C
188 lines
6.7 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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#define BTRFS_SUPER_INFO_OFFSET (64 * 1024)
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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_CTREE_WRITES = (1 << 0),
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OPEN_CTREE_PARTIAL = (1 << 1),
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OPEN_CTREE_BACKUP_ROOT = (1 << 2),
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OPEN_CTREE_RECOVER_SUPER = (1 << 3),
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OPEN_CTREE_RESTORE = (1 << 4),
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OPEN_CTREE_NO_BLOCK_GROUPS = (1 << 5),
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OPEN_CTREE_EXCLUSIVE = (1 << 6),
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OPEN_CTREE_NO_DEVICES = (1 << 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 = (1 << 8),
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/* Return chunk root */
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__OPEN_CTREE_RETURN_CHUNK_ROOT = (1 << 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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OPEN_CTREE_IGNORE_FSID_MISMATCH = (1 << 10),
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/*
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* Allow open_ctree_fs_info() to return a incomplete fs_info with
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* system chunks from super block only.
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* It's useful for chunk corruption case.
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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 = (1 << 11),
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/* Allow to open a partially created filesystem */
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OPEN_CTREE_FS_PARTIAL = (1 << 12),
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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_PARTIAL = (1 << 1),
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};
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static inline u64 btrfs_sb_offset(int mirror)
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{
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u64 start = 16 * 1024;
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if (mirror)
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return start << (BTRFS_SUPER_MIRROR_SHIFT * 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_fs_info(
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struct btrfs_fs_info *fs_info, u64 bytenr, u32 blocksize,
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u64 parent_transid);
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static inline struct extent_buffer* read_tree_block(
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struct btrfs_root *root, u64 bytenr, u32 blocksize,
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u64 parent_transid)
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{
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return read_tree_block_fs_info(root->fs_info, bytenr, blocksize,
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parent_transid);
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}
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int read_extent_data(struct btrfs_root *root, char *data, u64 logical,
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u64 *len, int mirror);
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void readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
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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, u32 blocksize);
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int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
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u32 stripesize, struct btrfs_root *root,
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struct btrfs_fs_info *fs_info, u64 objectid);
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int clean_tree_block(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, 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, int writable);
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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_root *root);
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int write_ctree_super(struct btrfs_trans_handle *trans,
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struct btrfs_root *root);
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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_root *root,
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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 wait_on_tree_block_writeback(struct btrfs_root *root,
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struct extent_buffer *buf);
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u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len);
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void btrfs_csum_final(u32 crc, char *result);
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int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
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struct btrfs_root *root);
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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);
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int verify_tree_block_csum_silent(struct extent_buffer *buf, u16 csum_size);
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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_root *root,
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struct extent_buffer *eb);
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int write_and_map_eb(struct btrfs_trans_handle *trans, struct btrfs_root *root,
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struct extent_buffer *eb);
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/* raid6.c */
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void raid6_gen_syndrome(int disks, size_t bytes, void **ptrs);
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#endif
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