Normal btrfs_item_key_to_cpu() will need extent buffer to do it, and there is not stack version to handle in memory leaf.
Add btrfs_stack_item_key_to_cpu() function for such operation, which will provide the basis for later qgroup fix. Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com> --- v2: Change the char* parameter to struct btrfs_header *, as a leaf always has a header. v3: Fix a bug caused in type change of stack_leaf. --- fs/btrfs/ctree.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 938efe3..b824fe2 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -2683,6 +2683,17 @@ static inline void btrfs_item_key(struct extent_buffer *eb, read_eb_member(eb, item, struct btrfs_item, key, disk_key); } +static inline void btrfs_stack_item_key(struct btrfs_header *stack_leaf, + struct btrfs_disk_key *disk_key, + int nr) +{ + unsigned long item_offset = btrfs_item_nr_offset(nr); + struct btrfs_item *item; + + item = (struct btrfs_item *)((char *)(stack_leaf) + item_offset); + memcpy(disk_key, &item->key, sizeof(*disk_key)); +} + static inline void btrfs_set_item_key(struct extent_buffer *eb, struct btrfs_disk_key *disk_key, int nr) { @@ -2785,6 +2796,15 @@ static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb, btrfs_disk_key_to_cpu(key, &disk_key); } +static inline void btrfs_stack_item_key_to_cpu(struct btrfs_header *stack_leaf, + struct btrfs_key *key, + int nr) +{ + struct btrfs_disk_key disk_key; + btrfs_stack_item_key(stack_leaf, &disk_key, nr); + btrfs_disk_key_to_cpu(key, &disk_key); +} + static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb, struct btrfs_dir_item *item, struct btrfs_key *key) -- 2.6.1 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html