On Fri, 6 Nov 2020 at 08:42, Patrick O'Callaghan <pocallaghan@xxxxxxxxx> wrote:
On Fri, 2020-11-06 at 20:27 +0800, Qiyu Yan wrote:
> Patrick O'Callaghan <pocallaghan@xxxxxxxxx> 于2020年11月6日周五 下午8:14写道：
> >
> > On Fri, 2020-11-06 at 11:18 +0000, Patrick O'Callaghan wrote:
> > > On Fri, 2020-11-06 at 05:43 +0000, Qiyu Yan wrote:
> > > > You can use swapfile on btrfs with nocow
> > > > [...]
> > > > https://wiki.archlinux.org/index.php/btrfs#Swap_file for instructions
> > >
> > > Great. I was actually wondering about precisely that, so I'm glad to
> > > see it's supported with the right incantations.
> >
> > Trying to follow the instructions in the above URL, but clearly I'm
> > misunderstanding something:
> >
> > # btrfs sub create /SWAP
> > Create subvolume '//SWAP'
> > # btrfs property set /SWAP compression no
> > # btrfs sub show /SWAP
> > root/SWAP
> > Name: SWAP
> > UUID: 1d4d839a-fd4e-d345-8d3f-ea858af71982
> > Parent UUID: -
> > Received UUID: -
> > Creation time: 2020-11-06 11:41:37 +0000
> > Subvolume ID: 1311
> > Generation: 14657
> > Gen at creation: 14547
> > Parent ID: 257
> > Top level ID: 257
> > Flags: -
> > Snapshot(s):
> > # cd /SWAP
> > # truncate -s 0 ./swapfile
> > # chattr +C /SWAP
> > chattr: Invalid argument while setting flags on /SWAP
> Try setting +C flag on the file rather than the subvolume itself
# chattr +C swapfile
chattr: Invalid argument while setting flags on swapfile
Mybe we are no lnpger meant to use chattr: Manual page btrfs-property(8) says:
"btrfs property provides an unified and user-friendly method to tune different btrfs
properties instead of using the traditional method like chattr(1) or lsattr(1)."
--
George N. White III
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