Do not allow xfs_db (or the xfs_admin frontend) to change the UUID
of a V5 filesystem; this will cause UUID mismatches across the
filesystem, and we currently have no mechanism to update them all.
Changing only the superblock UUID makes all other metadata look
invalid, and xfs_repair reacts by junking everything.
Addresses-Debian-Bug: 782012
Reported-by: F. Stoyan <fstoyan@xxxxxxxxx>
Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
---
V2, fix up comment whitespace :/
(and add brian's review for dave's convenience)
diff --git a/db/sb.c b/db/sb.c
index 6cb665d..f31f4a2 100644
--- a/db/sb.c
+++ b/db/sb.c
@@ -363,6 +363,18 @@ uuid_f(
return 0;
}
+ /*
+ * For now, changing the UUID of V5 superblock filesystems is
+ * not supported; we do not have the infrastructure to fix all
+ * other metadata when a new superblock UUID is generated.
+ */
+ if (xfs_sb_version_hascrc(&mp->m_sb) &&
+ strcasecmp(argv[1], "rewrite")) {
+ dbprintf(_("%s: only 'rewrite' supported on V5 fs\n"),
+ progname);
+ return 0;
+ }
+
if (!strcasecmp(argv[1], "generate")) {
platform_uuid_generate(&uu);
} else if (!strcasecmp(argv[1], "nil")) {
_______________________________________________
xfs mailing list
xfs@xxxxxxxxxxx
http://oss.sgi.com/mailman/listinfo/xfs
_______________________________________________
xfs mailing list
xfs@xxxxxxxxxxx
http://oss.sgi.com/mailman/listinfo/xfs
