Move from 5.9.3 kernel to 5.4.75?

Move from 5.9.3 kernel to 5.4.75?

[Pete]

Is there an impact for btrfs for moving from a 5.9.3 kernel to 5.4.75
kernel?  I'm using raid1 or single (more than one file system), no 1c2
or 1c3 etc, space_cache_v2 and zstd compression.  The reason is that I'm
trying to see if this fixes another problem - but breaking my file
system is a major concern.

thanks,

Pete

Re: Move from 5.9.3 kernel to 5.4.75?

[Hugo Mills]

On Sat, Nov 07, 2020 at 03:12:59PM +0000, Pete wrote:
> Is there an impact for btrfs for moving from a 5.9.3 kernel to 5.4.75
> kernel?  I'm using raid1 or single (more than one file system), no 1c2
> or 1c3 etc, space_cache_v2 and zstd compression.  The reason is that I'm
> trying to see if this fixes another problem - but breaking my file
> system is a major concern.

   If it's going to fail, it'll fail safely. If there are features
used on the FS that the earlier kernel can't deal with, it'll spot
that there's incompat bits set and refuse to mount.

   You'll get back all the kernel bugs that didn't have fixes
backported, but that's all.

   Hugo.

-- 
Hugo Mills             | "There's a Martian war machine outside -- they want
hugo@... carfax.org.uk | to talk to you about a cure for the common cold."
http://carfax.org.uk/  |
PGP: E2AB1DE4          |                           Stephen Franklin, Babylon 5

Re: Move from 5.9.3 kernel to 5.4.75?

[Pete]

On 11/7/20 3:44 PM, Hugo Mills wrote:

>    If it's going to fail, it'll fail safely. If there are features
> used on the FS that the earlier kernel can't deal with, it'll spot
> that there's incompat bits set and refuse to mount.
> 
>    You'll get back all the kernel bugs that didn't have fixes
> backported, but that's all.

Thanks.  Whilst the issues I have with a second x session are annoying
hosing the file system, even with backups, is far worse.  So thank you.

Pete