For btrfs_qgroup_account_extent(), modify make it exit quicker for
non-fs extents.
This will also reduce the noise in trace_btrfs_qgroup_account_extent
event.
Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com>
---
fs/btrfs/qgroup.c | 41 +++++++++++++++++++++++++++++++++++++++--
1 file changed, 39 insertions(+), 2 deletions(-)
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 3f75b5cbbfef..905fed1ee0dd 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -1915,6 +1915,33 @@ static int qgroup_update_counters(struct btrfs_fs_info
*fs_info,
return 0;
}
+/*
+ * Helper to check if the @roots is a list of fs tree roots
+ * Return 0 for definitely not a fs/subvol tree roots ulist
+ * Return 1 for possible fs/subvol tree roots ulist(including empty)
+ */
+static int maybe_fs_roots(struct ulist *roots)
+{
+ struct ulist_node *unode;
+ struct ulist_iterator uiter;
+
+ /* Empty one, still possible for fs roots */
+ if (!roots || roots->nnodes == 0)
+ return 1;
+
+ ULIST_ITER_INIT(&uiter);
+ unode = ulist_next(roots, &uiter);
+ if (!unode)
+ return 1;
+
+ /*
+ * If it contains fs tree roots, then it must belongs to fs/subvol
+ * trees.
+ * If it contains non-fs tree, it won't be shared to fs/subvol trees.
+ */
+ return is_fstree(unode->val);
+}
+
int
btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
@@ -1931,10 +1958,20 @@ btrfs_qgroup_account_extent(struct btrfs_trans_handle
*trans,
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
return 0;
- if (new_roots)
+ if (new_roots) {
+ if (!maybe_fs_roots(new_roots))
+ goto out_free;
nr_new_roots = new_roots->nnodes;
- if (old_roots)
+ }
+ if (old_roots) {
+ if (!maybe_fs_roots(old_roots))
+ goto out_free;
nr_old_roots = old_roots->nnodes;
+ }
+
+ /* Quick exit, either not fs tree roots, or won't affect any qgroup */
+ if (nr_old_roots == 0 && nr_new_roots == 0)
+ goto out_free;
BUG_ON(!fs_info->quota_root);
--
2.12.2
--
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