On Thu, Aug 20, 2009 at 07:32:30AM -0500, Victor Lowther wrote:
> On Thu, 2009-08-20 at 11:44 +0200, Karel Zak wrote:
> > On Wed, Aug 19, 2009 at 10:25:01PM -0500, Victor Lowther wrote:
> > > Since different distros may or may not use vol_id in udev, and blkid
> > > is generally replacing vol_id, abstract them out into a function which
> > > tries to use vol_id first and blkid second, on the assumption that
> > > blkid can take over for vol_id if vol_id is no longer there.
> > > ---
> > > dracut-functions | 11 +++++++++++
> > > modules.d/90crypt/check | 2 +-
> > > modules.d/90dmraid/check | 2 +-
> > > modules.d/90lvm/check | 4 ++--
> > > modules.d/90mdraid/check | 2 +-
> > > 5 files changed, 16 insertions(+), 5 deletions(-)
> > >
> > > diff --git a/dracut-functions b/dracut-functions
> > > index 1df2045..655d311 100755
> > > --- a/dracut-functions
> > > +++ b/dracut-functions
> > > @@ -48,6 +48,17 @@ derror() {
> > > [[ -w $dracutlogfile ]] && echo "E: $@" >>"$dracutlogfile"
> > > }
> > >
> > > +get_fs_type() (
> > > + if [[ -x /lib/udev/vol_id ]]; then
> > > + eval /usr/udev/vol_id --export $1
> > > + echo $ID_FS_TYPE
> > > + elif find_binary >/dev/null; then
> > > + blkid -o value -s TYPE $1
> >
> > This is to expensive, the blkid(8) supports two modes: low-level and
> > high-level. The low-level mode together with "-o udev" is replacement
> > of vol_id.
>
> Expensive in what way?
The high-level mode (blkid without -p option) parses and updates
/etc/blkid.tab cache.
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
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