* Boston, MA 021110-1307, USA.
*/
-#ifndef __DISKIO__
-#define __DISKIO__
-#include "list.h"
-
-struct btrfs_buffer {
- u64 bytenr;
- u64 dev_bytenr;
- u32 size;
- int count;
- int fd;
- struct list_head dirty;
- struct list_head cache;
- union {
- struct btrfs_node node;
- struct btrfs_leaf leaf;
- };
+#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 independent
+ * 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)
};
-struct btrfs_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
- u32 blocksize);
-struct btrfs_buffer *find_tree_block(struct btrfs_root *root, u64 bytenr,
- u32 blocksize);
-int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
- struct btrfs_buffer *buf);
-int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
- struct btrfs_buffer *buf);
+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 btrfs_buffer *buf);
-int btrfs_commit_transaction(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, struct btrfs_super_block *s);
-struct btrfs_root *open_ctree(char *filename, struct btrfs_super_block *s);
-struct btrfs_root *open_ctree_fd(int fp, struct btrfs_super_block *super);
-int close_ctree(struct btrfs_root *root, struct btrfs_super_block *s);
-void btrfs_block_release(struct btrfs_root *root, struct btrfs_buffer *buf);
-int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root *root,
- struct btrfs_super_block *s);
-int btrfs_map_bh_to_logical(struct btrfs_root *root, struct btrfs_buffer *bh,
- u64 logical);
-int btrfs_csum_super(struct btrfs_root *root, struct btrfs_super_block *super);
-int btrfs_csum_node(struct btrfs_root *root, struct btrfs_node *node);
-#define BTRFS_SUPER_INFO_OFFSET (16 * 1024)
+ 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,
+ u64 chunk_root_bytenr);
+
+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,
+ u64 chunk_root_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
projects / platform / upstream / btrfs-progs.git / blobdiff