Re: [PATCH v3 00/38] idmapped mounts

Serge E. Hallyn
2020-11-28T22:55:40Z

On Sat, Nov 28, 2020 at 10:34:49PM +0100, Christian Brauner wrote:
> Hey everyone,

Hey Christian,

a general request. Argue with me if it seems misguided.

When looking at a patch or a small hunk of code, these days, if a variable
called 'ns' or 'user_ns' is seen passed to a function, it can be easy to
assume which user_ns it is based on what you think would make sense, but if
your assumption is wrong, your patch review will be wrong.

Can we stick to a convention where we have maybe

subj_userns - the userns of the task seeking some action
obj_userns - the userns of the thing being acted on - task, superblock,...
mnt_userns - the userns of a mountpoint through which an object is seen

You're replacing a lot of such callers and callsites in this patchset, so
this would be a great time to start doing that.

-serge