Hi Hajime,
On Tue, May 11, 2010 at 01:25:09AM -0400, Hajime Taira wrote:
> Here is patch that add new command fsfreeze.
> 'fsfreeze' suspend and resume access to an filesystem (Linux Ext3/4, ReiserFS, JFS, XFS)
> It like xfs_freeze command for XFS filesystem. I ported one for other filesystem.
> Because util-linux-ng should have this. I think so.
I have doubts that we need this command. I have talked about it with FS
developers and response was pretty vague -- it seems that the command
is pointless for normal users/admins and crazy people who need to backup by
dd if=/dev/foo of=backup.img can install and use xfs_freeze.
> usage:
> # fsfreeze -f /var/ftp
> # lvcreate -s -L 10G -n ls_ftpd_snap /dev/vg_data/lv_ftpd
This is unnecessary. DM freezes FS automatically. See fs/ioctl.c and
drivers/md/dm.c in kernel -- both calls freeze_bdev().
> # fsfreeze -u /var/ftp
BTW, the ioctls are pretty ugly. It requires mountpoint as an
argument, but it's implemented by freeze_bdev() that uses block
device. It would be more sane to have something like BLKFREEZEFS.
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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