[systemd-devel] Failed to open system journal: Invalid argument

[Kay One]

Thank you so much for your time.
Let me try changing JFFS2 to UBIFS as another available option to use for
my SOC.

I would keep you guys posted.

Regards,
Karnik Jain

On Tue, May 21, 2019 at 8:18 PM Lennart Poettering <lennart at poettering.net>
wrote:

> On Di, 21.05.19 17:37, Kay One (kayone007 at gmail.com) wrote:
>
> > Thanks for the reply Lennart.
> >
> > 1) mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_SHARED, 28, 0) = -1 EINVAL
> > > (Invalid argument) is the culprit for this error???
>
> Yes.
>
> > 2) If YES. Is this JFFS2 MTD file system bug or
>
> It's a missing feature of the fs implementation, that the journal
> relies on. Memory mapping a file is not a particularly exotic feature,
> and yes, file systems really should implement that.
>
> So my recommendation would be: work with the jffs2 folks to add this
> to the kernel. They already have it for PROT_READ afaik, doing it for
> PROT_WRITE is extra work, and not trivial but it will fix jffs2 for
> every program that uses mmap for writing, and journald is just one of
> them.
>
> > 3) Is this not considered as systemd bug to support compatibility for
> such
> > file system? Check first FS support writable mappings or not and if not
> > then use other method to enable Persistence logging for systemd?
>
> I think it's better to fix jffs2 in this regard than to add a
> userspace workaround to every single consumer of it.
>
> Doing this without mmap() is not trivial, and I don't see anyone
> stepping up to do the work. It wouldn't precisely make our codebase
> easier to read either...
>
> Lennart
>
> --
> Lennart Poettering, Berlin
>
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