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

[Marc Aurèle La France]

On Tue, 2024-Aug-13, Eric Sandeen wrote:
> 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@xxxxxxxxxx>
> > > Fixes: a20971c18752 ("vfs: Convert debugfs to use the new mount API")
> > > Cc: stable@xxxxxxxxxxxxxxx # 6.10.x: 9f111059e725: fs_parse: add uid & gid option option parsing helpers
> > > Cc: stable@xxxxxxxxxxxxxxx # 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?

Meaning what?  I'd say you're in a better position to explain why debugfs
shouldn't follow other fs's in this regard.

Marc.