On Fri, 6 Nov 2020 at 08:42, Patrick O'Callaghan <pocallag...@gmail.com> wrote:
> On Fri, 2020-11-06 at 20:27 +0800, Qiyu Yan wrote: > > Patrick O'Callaghan <pocallag...@gmail.com> 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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