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There are several bugs/hangs when trying to take a snapshot on a UFS/FFS

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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
This commit is contained in:
Kirk McKusick 2012-01-17 01:14:56 +00:00
parent cc672d3599
commit 86b571509a
1 changed files with 9 additions and 1 deletions
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10
sys/ufs/ffs/ffs_snapshot.c
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@ -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.
*/