From: Theodore Ts'o <tytso@mit.edu>
Date: Sun, 6 Sep 2015 02:21:35 +0000 (-0400)
Subject: tune2fs: allow changing the UUID mounted file systems with the -f option
X-Git-Tag: v1.43-WIP-2016-03-15~53
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2334bd3ae56a4a8eff8e129da3c7aeec9672c6e1;p=thirdparty%2Fe2fsprogs.git

tune2fs: allow changing the UUID mounted file systems with the -f option

There are times when it is necessary to update the UUID on a mounted
root file system (for example).  So when we add this this safety check
to e2fsprogs 1.43, we will likely break some scripts.  Allow the -f
option to force an override of this safety check.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---

diff --git a/misc/tune2fs.c b/misc/tune2fs.c
index f9ce38cb4..2f27d6ff3 100644
--- a/misc/tune2fs.c
+++ b/misc/tune2fs.c
@@ -2960,7 +2960,7 @@ retry_open:
 			 * Changing the UUID requires rewriting all metadata,
 			 * which can race with a mounted fs.  Don't allow that.
 			 */
-			if (mount_flags & EXT2_MF_MOUNTED) {
+			if ((mount_flags & EXT2_MF_MOUNTED) && !f_flag) {
 				fputs(_("The UUID may only be "
 					"changed when the filesystem is "
 					"unmounted.\n"), stderr);