[PATCH 5/9] Unionfs: don't bother validating dentry if it has no lower branches

Signed-off-by: Erez Zadok <[email protected]>
---
 fs/unionfs/debug.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/fs/unionfs/debug.c b/fs/unionfs/debug.c
index 68692d7..894bf7c 100644
--- a/fs/unionfs/debug.c
+++ b/fs/unionfs/debug.c
@@ -132,6 +132,9 @@ void __unionfs_check_dentry(const struct dentry *dentry,
 	inode = dentry->d_inode;
 	dstart = dbstart(dentry);
 	dend = dbend(dentry);
+	/* don't check dentry/mnt if no lower branches */
+	if (dstart < 0 && dend < 0)
+		goto check_inode;
 	BUG_ON(dstart > dend);
 
 	if (unlikely((dstart == -1 && dend != -1) ||
@@ -212,6 +215,7 @@ void __unionfs_check_dentry(const struct dentry *dentry,
 		}
 	}
 
+check_inode:
 	/* for inodes now */
 	if (!inode)
 		return;
-- 
1.5.2.2

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---

• References:
  • [GIT PULL -mm] 0/9 Unionfs updates/cleanups/fixes
    • From: Erez Zadok <[email protected]>

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