Author: mckusick
Date: Tue Jan 17 01:14:56 2012
New Revision: 230250
URL: http://svn.freebsd.org/changeset/base/230250
Log:
There are several bugs/hangs when trying to take a snapshot on a UFS/FFS
filesystem running with journaled soft updates. Until these problems
have been tracked down, return ENOTSUPP when an attempt is made to
take a snapshot on a filesystem running with journaled soft updates.
MFC after: 2 weeks
Modified:
head/sys/ufs/ffs/ffs_snapshot.c
Modified: head/sys/ufs/ffs/ffs_snapshot.c
==============================================================================
--- head/sys/ufs/ffs/ffs_snapshot.c Tue Jan 17 01:08:01 2012
(r230249)
+++ head/sys/ufs/ffs/ffs_snapshot.c Tue Jan 17 01:14:56 2012
(r230250)
@@ -225,10 +225,18 @@ ffs_snapshot(mp, snapfile)
ump = VFSTOUFS(mp);
fs = ump->um_fs;
sn = NULL;
+ /*
+ * At the moment, journaled soft updates cannot support
+ * taking snapshots.
+ */
+ if (MOUNTEDSUJ(mp)) {
+ vfs_mount_error(mp, "%s: Snapshots are not yet supported when "
+ "running with journaled soft updates", fs->fs_fsmnt);
+ return (EOPNOTSUPP);
+ }
MNT_ILOCK(mp);
flag = mp->mnt_flag;
MNT_IUNLOCK(mp);
-
/*
* Need to serialize access to snapshot code per filesystem.
*/
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