RFC: swapon(8) vnode-backed md and gbde/geli encryption support
crees at bayofrum.net
Thu Jun 27 16:59:35 UTC 2013
On 27 Jun 2013, at 09:06, Hiroki Sato wrote:
> Hiroki Sato <hrs at freebsd.org> wrote
> in <20130623.035356.644417021040610458.hrs at allbsd.org>:
> hr> Hi,
> hr> I created a patchset to add support of automatic generation of
> hr> vnode-backed md(4) devices and gbde/geli geom providers to swapon(8)
> hr> via /etc/fstab. We already have equivalent functionality by using
> hr> rc.d scripts. This simplifies rc.d scripts and fixes a race between
> hr> mdconfig/gbde/geli and swapon/swapoff by using /etc/fstab.
> A slightly revised patch is attached. I will commit this today.
> -- Hiroki
> - Add vnode-backed swap space specification support. This is enabled when
> device names "md" or "md[0-9]*" and a "file" option are specified in
> /etc/fstab like this:
> md none swap sw,file=/swap.bin 0 0
> - Add GBDE/GELI encrypted swap space specification support, which
> rc.d/encswap supported. The /etc/fstab lines are like the following:
> /dev/ada1p1.bde none swap sw 0 0
> /dev/ada1p2.eli none swap sw 0 0
> .eli devices accepts aalgo, ealgo, keylen, and sectorsize as options.
> swapctl(8) can understand an encrypted device in the command line
> like this:
> # swapctl -a /dev/ada2p1.bde
> - "-L" flag is added to support "late" option to defer swapon until
> rc.d/mountlate runs.
> - rc.d script change:
> rc.d/encswap -> removed
> rc.d/addswap -> just display a warning message if is defined.
> rc.d/swap1 -> renamed to rc.d/swap
> rc.d/swaplate -> newly added to support "late" option
> These changes alleviate a race condition between device creation/removal
> and swapon/swapoff.
> MFC after: 1 week
Looks fantastic-- better than hacking around in shell scripts I suppose :)
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