Vitez Gabor wrote:
> Hi,
>
> It would be really great if ext4 supported an xfs_freeze like operation.
> On xfs it spared me a lot of headaches when I was playing with unstable
> kernel features.
>
> thanks
> Gabor
>
Right now ext3 and ext4 -can- be frozen, but only via devicemapper,
because the call to freeze_bdev is only exposed via
<dm ioctl>
dev_suspend
do_suspend
dm_suspend
lock_fs
freeze_bdev <-- generic, exported kernel function
on an lvm volume. So, I think ext[34] are perfectly capable of being
frozen, there's just no generic userspace utility to point at a generic
block device to do that freezing. xfs's collection of ioctls to do this
directly got grandfathered in, I guess. :)
-Eric
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