fs: btrfs: Crossport read_tree_block() from btrfs-progs
This is the one of the basic stone function for btrfs, which:
- Resolves the chunk mappings
- Reads data from disk
- Does various sanity check
With read_tree_block(), we can finally crossport needed btrfs btree
operations to U-Boot.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index c746d3f..7f024c0 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -59,6 +59,16 @@
#define BTRFS_MAX_EXTENT_SIZE SZ_128M
+enum btrfs_tree_block_status {
+ BTRFS_TREE_BLOCK_CLEAN,
+ BTRFS_TREE_BLOCK_INVALID_NRITEMS,
+ BTRFS_TREE_BLOCK_INVALID_PARENT_KEY,
+ BTRFS_TREE_BLOCK_BAD_KEY_ORDER,
+ BTRFS_TREE_BLOCK_INVALID_LEVEL,
+ BTRFS_TREE_BLOCK_INVALID_FREE_SPACE,
+ BTRFS_TREE_BLOCK_INVALID_OFFSETS,
+};
+
struct btrfs_device;
struct btrfs_fs_devices;
struct btrfs_fs_info {
@@ -88,6 +98,35 @@
u32 stripesize;
};
+static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
+{
+ return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
+}
+
+static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
+{
+ return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
+}
+
+static inline u32 BTRFS_NODEPTRS_PER_EXTENT_BUFFER(const struct extent_buffer *eb)
+{
+ BUG_ON(eb->fs_info && eb->fs_info->nodesize != eb->len);
+ return __BTRFS_LEAF_DATA_SIZE(eb->len) / sizeof(struct btrfs_key_ptr);
+}
+
+#define BTRFS_FILE_EXTENT_INLINE_DATA_START \
+ (offsetof(struct btrfs_file_extent_item, disk_bytenr))
+static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
+{
+ return BTRFS_MAX_ITEM_SIZE(info) -
+ BTRFS_FILE_EXTENT_INLINE_DATA_START;
+}
+
+static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
+{
+ return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
+}
+
/*
* File system states
*/
@@ -1149,7 +1188,7 @@
u64 root_dirid;
};
-int btrfs_comp_keys(struct btrfs_key *, struct btrfs_key *);
+int __btrfs_comp_keys(struct btrfs_key *, struct btrfs_key *);
int btrfs_comp_keys_type(struct btrfs_key *, struct btrfs_key *);
int btrfs_bin_search(union btrfs_tree_node *, struct btrfs_key *, int *);
void btrfs_free_path(struct btrfs_path *);
@@ -1209,4 +1248,13 @@
u16 btrfs_csum_type_size(u16 csum_type);
size_t btrfs_super_num_csums(void);
+/* ctree.c */
+int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
+enum btrfs_tree_block_status
+btrfs_check_node(struct btrfs_fs_info *fs_info,
+ struct btrfs_disk_key *parent_key, struct extent_buffer *buf);
+enum btrfs_tree_block_status
+btrfs_check_leaf(struct btrfs_fs_info *fs_info,
+ struct btrfs_disk_key *parent_key, struct extent_buffer *buf);
+int btrfs_leaf_free_space(struct extent_buffer *leaf);
#endif /* __BTRFS_CTREE_H__ */