X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=disk-io.h;h=f6a422f2a7737a4584d2255d983439e8b4c2ffae;hb=660adc0e1cad9fa46d4f689ae9c5c3202041863f;hp=4caebeb18b3fabfb28403ef3021864c023140ec6;hpb=c02b4adcb6a529a29f429db3020405f9aefc2f0d;p=platform%2Fupstream%2Fbtrfs-progs.git diff --git a/disk-io.h b/disk-io.h index 4caebeb..f6a422f 100644 --- a/disk-io.h +++ b/disk-io.h @@ -19,90 +19,155 @@ #ifndef __BTRFS_DISK_IO_H__ #define __BTRFS_DISK_IO_H__ -#define BTRFS_SUPER_INFO_OFFSET (64 * 1024) +#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_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), + /* 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 = (1 << 8), - /* Return chunk root */ - __OPEN_CTREE_RETURN_CHUNK_ROOT = (1 << 9), + 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 indepent - * tree bits. + * 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 a partially created filesystem */ + OPEN_CTREE_FS_PARTIAL = (1U << 12), + + /* + * Invalidate the free space tree (i.e., clear the FREE_SPACE_TREE_VALID + * compat_ro bit). + */ + OPEN_CTREE_INVALIDATE_FST = (1U << 13), +}; + +/* + * 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_PARTIAL = (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) { - u64 start = 16 * 1024; if (mirror) - return start << (BTRFS_SUPER_MIRROR_SHIFT * 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_root *root, u64 bytenr, - u32 blocksize, u64 parent_transid); -void readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize, +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_root *root, - u64 bytenr, u32 blocksize); +struct extent_buffer* btrfs_find_create_tree_block( + struct btrfs_fs_info *fs_info, u64 bytenr); -int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, - u32 stripesize, struct btrfs_root *root, - struct btrfs_fs_info *fs_info, u64 objectid); +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, int writable); +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, - enum btrfs_open_ctree_flags flags); + 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, - int super_recover, int skip_devices); -int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info); + 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, - enum btrfs_open_ctree_flags flags); + unsigned flags); struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr, - enum btrfs_open_ctree_flags flags); + unsigned 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(struct btrfs_root *root); -int write_all_supers(struct btrfs_root *root); + 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_root *root); + struct btrfs_fs_info *fs_info); int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr, - int super_recover); + 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_root *root, +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); @@ -112,22 +177,17 @@ 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); +u32 btrfs_csum_data(char *data, u32 seed, size_t len); +void btrfs_csum_final(u32 crc, u8 *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_and_map_eb(struct btrfs_trans_handle *trans, struct btrfs_root *root, +int write_tree_block(struct btrfs_trans_handle *trans, + struct btrfs_fs_info *fs_info, struct extent_buffer *eb); - -/* raid6.c */ -void raid6_gen_syndrome(int disks, size_t bytes, void **ptrs); +int write_and_map_eb(struct btrfs_fs_info *fs_info, struct extent_buffer *eb); #endif