mirror of
https://github.com/freebsd/freebsd-src
synced 2024-09-06 17:18:32 +00:00
Enable taking snapshots on UFS/FFS filesystems using journaled soft updates.
All the needed infrastructure updates have been made to allow snapshots to be taken on UFS/FFS filesystems that are using journaled soft updates. The most immediate benefit is the ability to use a snapshot to take a consistent filesystem dump on a live filesystem using the -L option to dump(8). Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D36491
This commit is contained in:
parent
5c7ba6bdf8
commit
78f4129876
|
@ -205,9 +205,7 @@ is running.
|
||||||
Running a full fsck on a UFS filesystem is the equivalent of
|
Running a full fsck on a UFS filesystem is the equivalent of
|
||||||
running a scrub on a ZFS filesystem.
|
running a scrub on a ZFS filesystem.
|
||||||
.Pp
|
.Pp
|
||||||
Presently it is not possible to take a snapshot on a UFS filesystem
|
Presently it is not possible
|
||||||
running with journaled soft updates.
|
|
||||||
Thus it is not possible to reliably dump mounted filesystems or
|
|
||||||
to run background fsck on filesystems enabled for journaling.
|
to run background fsck on filesystems enabled for journaling.
|
||||||
.It Fl k Ar held-for-metadata-blocks
|
.It Fl k Ar held-for-metadata-blocks
|
||||||
Set the amount of space to be held for metadata blocks in each cylinder group.
|
Set the amount of space to be held for metadata blocks in each cylinder group.
|
||||||
|
|
|
@ -131,9 +131,7 @@ is running.
|
||||||
Running a full fsck on a UFS filesystem is the equivalent of
|
Running a full fsck on a UFS filesystem is the equivalent of
|
||||||
running a scrub on a ZFS filesystem.
|
running a scrub on a ZFS filesystem.
|
||||||
.Pp
|
.Pp
|
||||||
Presently it is not possible to take a snapshot on a UFS filesystem
|
Presently it is not possible
|
||||||
running with journaled soft updates.
|
|
||||||
Thus it is not possible to reliably dump mounted filesystems or
|
|
||||||
to run background fsck on filesystems enabled for journaling.
|
to run background fsck on filesystems enabled for journaling.
|
||||||
.It Fl J Cm enable | disable
|
.It Fl J Cm enable | disable
|
||||||
Turn on/off gjournal flag.
|
Turn on/off gjournal flag.
|
||||||
|
|
|
@ -226,15 +226,6 @@ ffs_snapshot(struct mount *mp, char *snapfile)
|
||||||
ump = VFSTOUFS(mp);
|
ump = VFSTOUFS(mp);
|
||||||
fs = ump->um_fs;
|
fs = ump->um_fs;
|
||||||
sn = NULL;
|
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);
|
MNT_ILOCK(mp);
|
||||||
flag = mp->mnt_flag;
|
flag = mp->mnt_flag;
|
||||||
MNT_IUNLOCK(mp);
|
MNT_IUNLOCK(mp);
|
||||||
|
|
Loading…
Reference in a new issue