d_path: kerneldoc cleanup

Move and update d_path() kernel API documentation.
Signed-off-by: NJan Blunck <jblunck@suse.de>
Acked-by: NChristoph Hellwig <hch@infradead.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

fs/dcache.c

@@ -1843,9 +1843,22 @@ static char *__d_path(struct dentry *dentry, struct vfsmount *vfsmnt,
 	return ERR_PTR(-ENAMETOOLONG);
 }
 
-/* write full pathname into buffer and return start of pathname */
-char * d_path(struct dentry *dentry, struct vfsmount *vfsmnt,
-				char *buf, int buflen)
+/**
+ * d_path - return the path of a dentry
+ * @dentry: dentry to report
+ * @vfsmnt: vfsmnt to which the dentry belongs
+ * @buf: buffer to return value in
+ * @buflen: buffer length
+ *
+ * Convert a dentry into an ASCII path name. If the entry has been deleted
+ * the string " (deleted)" is appended. Note that this is ambiguous.
+ *
+ * Returns the buffer or an error code if the path was too long.
+ *
+ * "buflen" should be positive. Caller holds the dcache_lock.
+ */
+char *d_path(struct dentry *dentry, struct vfsmount *vfsmnt,
+	     char *buf, int buflen)
 {
 	char *res;
 	struct path root;