ocfs2: Provide convenience function for ino lookup

A couple paths which needed to just match a parent dir + name pair to an
inode number were a bit messy because they had to deal with
ocfs2_find_files_on_disk() which returns a larger number of values. Provide
a convenience function, ocfs2_lookup_ino_from_name() which internalizes all
the extra accounting.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Reviewed-by: Joel Becker <joel.becker@oracle.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c
index 4bb54406354..4791683a119 100644
--- a/fs/ocfs2/dir.c
+++ b/fs/ocfs2/dir.c
@@ -628,6 +628,23 @@ leave:
 	return status;
 }
 
+/*
+ * Convenience function for callers which just want the block number
+ * mapped to a name and don't require the full dirent info, etc.
+ */
+int ocfs2_lookup_ino_from_name(struct inode *dir, const char *name,
+			       int namelen, u64 *blkno)
+{
+	int ret;
+	struct buffer_head *bh = NULL;
+	struct ocfs2_dir_entry *dirent = NULL;
+
+	ret = ocfs2_find_files_on_disk(name, namelen, blkno, dir, &bh, &dirent);
+	brelse(bh);
+
+	return ret;
+}
+
 /* Check for a name within a directory.
  *
  * Return 0 if the name does not exist