Re: Fedora 35 swapon: /swapfile: swapon failed: Invalid argument

[Matti Pulkkinen]

ke, 2022-03-23 kello 11:40 +0000, bradbell(a)seanet.com kirjoitti:
>  I am trying to create a swapfile on my fedora 35 system and do not
>  know what I am doing wrong:
>  trash>uname -a
>  Linux fedora 5.16.15-201.fc35.x86_64 #1 SMP PREEMPT Thu Mar 17
>  05:45:13 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
>  
>  If I follow the swapfile instructions on
>
> https://docs.fedoraproject.org/en-US/Fedora/14/html/Storage_Administratio...
>  I get the following result:
>  
>  step 1:
>  trash>sudo dd if=/dev/zero of=/swapfile bs=1024 count=65536
>  65536+0 records in
>  65536+0 records out
>  67108864 bytes (67 MB, 64 MiB) copied, 0.147119 s, 456 MB/s
>  
>  step 2:
>  trash>sudo mkswap /swapfile
>  mkswap: /swapfile: insecure permissions 0644, fix with: chmod 0600
>  /swapfile
>  Setting up swapspace version 1, size = 64 MiB (67104768 bytes)
>  no label, UUID=f1402a6a-c64c-4f84-9d47-4f8822d2f1d2
>  
>  step 3:
>  sudo  chmod 0600 /swapfile
>  
>  step 4:
>  trash>sudo swapon /swapfile
>  swapon: /swapfile: swapon failed: Invalid argument
>  
>  
One reason this could happen is if you're trying to create the swapfile
on a btrfs filesystem. In that case you'll need to disable copy-on-
write on that file first:

1. truncate -s 0 /swapfile
2. chattr +C /swapfile
3. dd if=/dev/zero of=/swapfile bs=1024 count=65536
4. chmod 600 /swapfile
5. mkswap /swapfile
6. swapon /swapfile


However, all of this this may not be necessary, since recent releases
of Fedora have zram swap enabled by default anyway.

-- 
Terveisin / Regards,
Matti Pulkkinen