[PATCH 17/41] whiteout: Add path_whiteout() helper

[Valerie Aurora]

From: Jan Blunck <jblunck@xxxxxxx>

Add a path_whiteout() helper for vfs_whiteout().

Signed-off-by: Jan Blunck <jblunck@xxxxxxxx>
Signed-off-by: Valerie Aurora <vaurora@xxxxxxxxxx>
---
 fs/namei.c         |   15 ++++++++++++++-
 include/linux/fs.h |    1 -
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 9a62c75..408380d 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2231,7 +2231,7 @@ static inline int may_whiteout(struct inode *dir, struct dentry *victim,
  * After this returns with success, don't make any assumptions about the inode.
  * Just dput() it dentry.
  */
-int vfs_whiteout(struct inode *dir, struct dentry *dentry, int isdir)
+static int vfs_whiteout(struct inode *dir, struct dentry *dentry, int isdir)
 {
 	int err;
 	struct inode *old_inode = dentry->d_inode;
@@ -2283,6 +2283,19 @@ int vfs_whiteout(struct inode *dir, struct dentry *dentry, int isdir)
 	return err;
 }
 
+int path_whiteout(struct path *dir_path, struct dentry *dentry, int isdir)
+{
+	int error = mnt_want_write(dir_path->mnt);
+
+	if (!error) {
+		error = vfs_whiteout(dir_path->dentry->d_inode, dentry, isdir);
+		mnt_drop_write(dir_path->mnt);
+	}
+
+	return error;
+}
+EXPORT_SYMBOL(path_whiteout);
+
 /*
  * This is abusing readdir to check if a union directory is logically empty.
  * Al Viro barfed when he saw this, but Val said: "Well, at this point I'm
diff --git a/include/linux/fs.h b/include/linux/fs.h
index b741e50..d13de8a 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1426,7 +1426,6 @@ extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
 extern int vfs_rmdir(struct inode *, struct dentry *);
 extern int vfs_unlink(struct inode *, struct dentry *);
 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
-extern int vfs_whiteout(struct inode *, struct dentry *, int);
 
 /*
  * VFS dentry helper functions.
-- 
1.6.3.3

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