Re: [PATCH] debugfs show actual source in /proc/mounts

[Eric Sandeen <sandeen@redhat.com>]

On 8/13/24 4:54 AM, Greg Kroah-Hartman wrote:
> On Sat, Aug 10, 2024 at 01:25:27PM -0600, Marc Aurèle La France wrote:
>> After its conversion to the new mount API, debugfs displays "none" in
>> /proc/mounts instead of the actual source.  Fix this by recognising its
>> "source" mount option.
>>
>> Signed-off-by: Marc Aurèle La France <tsi@tuyoix.net>
>> Fixes: a20971c18752 ("vfs: Convert debugfs to use the new mount API")
>> Cc: stable@vger.kernel.org # 6.10.x: 9f111059e725: fs_parse: add uid & gid option option parsing helpers
>> Cc: stable@vger.kernel.org # 6.10.x: 49abee5991e1: debugfs: Convert to new uid/gid option parsing helpers
> 
> As this came from a fs tree, I'll let the vfs maintainer take it if they
> think it is ok as I know nothing about the fs_parse stuff at the moment,
> sorry.

Hm, I guess this is OK, though it seems a little unexpected for debugfs
to have to parse the trivial internal "source" option.

This actually worked OK until

0c07c273a5fe debugfs: continue to ignore unknown mount options

but after that commit, debugfs claims to parse "source" successfully even
though it has not. So really, it Fixes: that commit, not the original
conversion.

I'm not sure of a better approach offhand, but maybe a comment about why
Opt_source exists in debugfs would help future readers?

Thanks,
-Eric


> greg k-h
>