diff options
author | Nicholas D Steeves <nsteeves@gmail.com> | 2016-04-23 00:41:30 +0100 |
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committer | Nicholas D Steeves <nsteeves@gmail.com> | 2016-04-23 00:41:30 +0100 |
commit | cec572daccafa1e912cbed363df6f84687778c6f (patch) | |
tree | 7d99ab9f73d25c1ed8eaf6393f6374edf5316b03 /disk-io.h |
btrfs-progs (4.4.1-1.1) unstable; urgency=medium
* Non-maintainer upload.
* New upstream release.
* Rename package to btrfs-progs (Closes: #780081)
* Update standards version to 3.9.7 (no changes needed).
* debian/control: Add "Breaks" per Gianfranco Costamagna's suggestion
* Change lintian override to reflect package rename
* Switch from using postinst and postrm to using triggers
per Christian Seiler's recommendation.
# imported from the archive
Diffstat (limited to 'disk-io.h')
-rw-r--r-- | disk-io.h | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/disk-io.h b/disk-io.h new file mode 100644 index 00000000..30ccb2bd --- /dev/null +++ b/disk-io.h @@ -0,0 +1,166 @@ +/* + * 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" + +#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 + */ + + OPEN_CTREE_IGNORE_FSID_MISMATCH = (1 << 10), + + /* + * Allow open_ctree_fs_info() to return a incomplete fs_info with + * system chunks from super block only. + * It's useful for chunk corruption case. + * Makes no sense for open_ctree variants returning btrfs_root. + */ + OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR = (1 << 11) +}; + +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_fs_info( + struct btrfs_fs_info *fs_info, u64 bytenr, u32 blocksize, + u64 parent_transid); +static inline struct extent_buffer* read_tree_block( + struct btrfs_root *root, u64 bytenr, u32 blocksize, + u64 parent_transid) +{ + return read_tree_block_fs_info(root->fs_info, bytenr, blocksize, + parent_transid); +} + +int read_extent_data(struct btrfs_root *root, char *data, u64 logical, + u64 *len, int mirror); +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_fs_info *fs_info, 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_fs_info(struct btrfs_fs_info *fs_info); +static inline int close_ctree(struct btrfs_root *root) +{ + BUG_ON(!root); + return close_ctree_fs_info(root->fs_info); +} + +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_tree_block(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct extent_buffer *eb); +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 |