btrfs-progs: check: introduce traversal function for fsck

[platform/upstream/btrfs-progs.git] / disk-io.h

diff --git a/disk-io.h b/disk-io.h
index 4818109..d860ff2 100644 (file)
--- a/disk-io.h
+++ b/disk-io.h
@@ -16,8 +16,11 @@
  * Boston, MA 021110-1307, USA.
  */
 
-#ifndef __DISKIO__
-#define __DISKIO__
+#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
@@ -26,13 +29,39 @@
 #define BTRFS_SUPER_MIRROR_SHIFT 12
 
 enum btrfs_open_ctree_flags {
-       OPEN_CTREE_WRITES               = 1,
-       OPEN_CTREE_PARTIAL              = 2,
-       OPEN_CTREE_BACKUP_ROOT          = 4,
-       OPEN_CTREE_RECOVER_SUPER        = 8,
-       OPEN_CTREE_RESTORE              = 16,
-       OPEN_CTREE_NO_BLOCK_GROUPS      = 32,
-       OPEN_CTREE_EXCLUSIVE            = 64,
+       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)
 };
 
 static inline u64 btrfs_sb_offset(int mirror)
@@ -46,12 +75,23 @@ static inline u64 btrfs_sb_offset(int mirror)
 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);
+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_root *root,
-                                                  u64 bytenr, u32 blocksize);
+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,
@@ -68,8 +108,9 @@ 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 btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info);
+                         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);
@@ -77,8 +118,15 @@ 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(struct btrfs_root *root);
+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);
@@ -108,9 +156,13 @@ 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);
-#endif
 
 /* raid6.c */
 void raid6_gen_syndrome(int disks, size_t bytes, void **ptrs);
+
+#endif