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-rw-r--r--fs/ocfs2/dcache.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/ocfs2/dcache.c b/fs/ocfs2/dcache.c
index 2d016937fdda..42a61eecdacd 100644
--- a/fs/ocfs2/dcache.c
+++ b/fs/ocfs2/dcache.c
@@ -296,6 +296,18 @@ int ocfs2_dentry_attach_lock(struct dentry *dentry,
out_attach:
spin_lock(&dentry_attach_lock);
+ if (unlikely(dentry->d_fsdata && !alias)) {
+ /* d_fsdata is set by a racing thread which is doing
+ * the same thing as this thread is doing. Leave the racing
+ * thread going ahead and we return here.
+ */
+ spin_unlock(&dentry_attach_lock);
+ iput(dl->dl_inode);
+ ocfs2_lock_res_free(&dl->dl_lockres);
+ kfree(dl);
+ return 0;
+ }
+
dentry->d_fsdata = dl;
dl->dl_count++;
spin_unlock(&dentry_attach_lock);