From: Valerie Aurora <vaurora@xxxxxxxxxx>
do_lookup_union() locks the parent directory and follows the mount
after lookup. It is appropriate for calling from do_lookup().
Signed-off-by: Valerie Aurora <valerie.aurora@xxxxxxxxx>
---
fs/namei.c | 22 ++++++++++++++++++++++
1 files changed, 22 insertions(+), 0 deletions(-)
diff --git a/fs/namei.c b/fs/namei.c
index 8257537..3fcb42c 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -909,6 +909,28 @@ static int lookup_union(struct nameidata *nd, struct qstr *name,
}
/*
+ * do_union_lookup - union mount-aware part of do_lookup
+ *
+ * do_lookup()-style wrapper for lookup_union(). Follows mounts.
+ */
+
+static int do_lookup_union(struct nameidata *nd, struct qstr *name,
+ struct path *topmost)
+{
+ struct dentry *parent = nd->path.dentry;
+ struct inode *dir = parent->d_inode;
+ int err;
+
+ mutex_lock(&dir->i_mutex);
+ err = lookup_union(nd, name, topmost);
+ mutex_unlock(&dir->i_mutex);
+
+ __follow_mount(topmost);
+
+ return err;
+}
+
+/*
* Allocate a dentry with name and parent, and perform a parent
* directory ->lookup on it. Returns the new dentry, or ERR_PTR
* on error. parent->d_inode->i_mutex must be held. d_lookup must
--
1.7.0.4
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