* Boston, MA 021110-1307, USA.
*/
-#ifndef __DISKIO__
-#define __DISKIO__
+#ifndef __BTRFS_DISK_IO_H__
+#define __BTRFS_DISK_IO_H__
-#define BTRFS_SUPER_INFO_OFFSET (16 * 1024)
+#include "kerncompat.h"
+#include "ctree.h"
+#include "sizes.h"
-struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
- u32 blocksize);
-int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize);
-struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
- u64 bytenr, u32 blocksize);
+#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),
+};
+
+/*
+ * 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);
-struct btrfs_root *open_ctree(char *filename, u64 sb_bytenr);
-struct btrfs_root *open_ctree_fd(int fp, u64 sb_bytenr);
-int close_ctree(struct btrfs_root *root);
+
+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_root *root);
+ 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_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);
-int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root);
+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);
+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_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);
-int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
- struct btrfs_root *root);
#endif
projects / platform / upstream / btrfs-progs.git / blobdiff