CIFS: Make use of common cifs_build_path_to_root for CIFS and SMB2

because the is no difference here. This also adds support of prefixpath
mount option for SMB2.

Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index d3671f2acb29..3b7e0c1266f7 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -44,6 +44,37 @@ renew_parental_timestamps(struct dentry *direntry)
 	} while (!IS_ROOT(direntry));
 }
 
+char *
+cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
+			struct cifs_tcon *tcon)
+{
+	int pplen = vol->prepath ? strlen(vol->prepath) : 0;
+	int dfsplen;
+	char *full_path = NULL;
+
+	/* if no prefix path, simply set path to the root of share to "" */
+	if (pplen == 0) {
+		full_path = kzalloc(1, GFP_KERNEL);
+		return full_path;
+	}
+
+	if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
+		dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
+	else
+		dfsplen = 0;
+
+	full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
+	if (full_path == NULL)
+		return full_path;
+
+	if (dfsplen)
+		strncpy(full_path, tcon->treeName, dfsplen);
+	strncpy(full_path + dfsplen, vol->prepath, pplen);
+	convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
+	full_path[dfsplen + pplen] = 0; /* add trailing null */
+	return full_path;
+}
+
 /* Note: caller must free return buffer */
 char *
 build_path_from_dentry(struct dentry *direntry)