Re: [PATCH RFC] vfs: always log mount API fs context messages to dmesg

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On Fri, Feb 23, 2024 at 10:27:54AM -0600, Eric Sandeen wrote:
> On 2/23/24 9:06 AM, Christian Brauner wrote:
> > On Thu, Feb 22, 2024 at 09:22:52AM -0600, Eric Sandeen wrote:
> >> As filesystems are converted to the new mount API, informational messages,
> >> errors, and warnings are being routed through infof, errorf, and warnf
> >> type functions provided by the mount API, which places these messages in
> >> the log buffer associated with the filesystem context rather than
> >> in the kernel log / dmesg.
> >>
> >> However, userspace is not yet extracting these messages, so they are
> >> essentially getting lost. mount(8) still refers the user to dmesg(1)
> >> on failure.
> > 
> > I mean sure we can do this. But we should try without a Kconfig option
> > for this.
> > 
> > But mount(8) and util-linux have been switched to the new mount api in
> > v2.39 and libmount already has the code to read and print the error
> > messages:
> > 
> > https://github.com/util-linux/util-linux/blob/7ca98ca6aab919f271a15e40276cbb411e62f0e4/libmount/src/hook_mount.c#L68
> 
> *nod*
> 
> > but it's hidden behind DEBUG.
> 
> Yup.
> 
> > So to me it seems much easier to just make
> > util-linux and log those extra messages than start putting them into
> > dmesg. Can't we try that first?
> 
> Sounds fine. Since we're trying to get a few more filesystems
> converted (hopefully all!) I just wanted to be sure that doing so
> doesn't end up losing useful information for the user.

I see.




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