BUG: Mount ignores mount options

David Howells [off-list ref] writes:

Eric W. Biederman [off-list ref] wrote:

quoted

There is a serious problem with mount options today that fsopen does not
address.  The problem is that mount options are ignored for block based
filesystems, and any other type of filesystem that follows the same
pattern.

Yes.  Since you *absolutely* *insist* on this being fixed *right* *now* *or*
*else*, I'm working up a set of additional patches to give userspace the
option of whether they want no sharing; sharing, but only with exactly the
same parameters; or to ignore the parameter differences and just accept
sharing of what's already already mounted (ie. the current behaviour).

The second option, however, is not trivial as it needs to compare the fs
contexts, including the LSM parameters.  To make that work, I really need to
remove the old security_mnt_opts stuff - which means I need to port btrfs to
the new context stuff.

We discussed this yesterday, and I proposed a solution, and I'm working on it.

I repeated this because after some comments from Al on IRC yesterday
and Miklos's email replay. It appeared clear that I had not specified
why my issue was clearly enough for people reading the thread to
understand the problem that I see.

Yes, I agree it would be nice to have, but it *doesn't* really need supporting
right this minute, since what I have now oughtn't to break the current
behaviour.

I am really reluctant to endorse anything that propagates the issues of
the current interface in the new mount interface.

Eric