This function is used to free a block group item.
It must be called with all the space in the block group pinned.
Or there is a possibility that tree blocks be allocated into the range.
The function is used for later block group/chunk free function.
Signed-off-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
---
extent-tree.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/extent-tree.c b/extent-tree.c
index c24af6a..d002a4f 100644
--- a/extent-tree.c
+++ b/extent-tree.c
@@ -3448,6 +3448,42 @@ int btrfs_update_block_group(struct btrfs_trans_handle *trans,
}
/*
+ * Just remove a block group item in extent tree
+ * Caller should ensure the block group is empty and all space is pinned.
+ * Or new tree block/data may be allocated into it.
+ */
+static int free_block_group_item(struct btrfs_trans_handle *trans,
+ struct btrfs_fs_info *fs_info,
+ u64 bytenr, u64 len)
+{
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ struct btrfs_root *root = fs_info->extent_root;
+ int ret = 0;
+
+ key.objectid = bytenr;
+ key.offset = len;
+ key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
+ if (ret > 0) {
+ ret = -ENOENT;
+ goto out;
+ }
+ if (ret < 0)
+ goto out;
+
+ ret = btrfs_del_item(trans, root, path);
+out:
+ btrfs_free_path(path);
+ return ret;
+}
+
+/*
* Fixup block accounting. The initial block accounting created by
* make_block_groups isn't accuracy in this case.
*/
--
2.4.4
--
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