file metadata via fs API (was: [GIT PULL] Filesystem Information)

From: Miklos Szeredi
Date: Wed Aug 05 2020 - 04:25:09 EST

On Tue, Aug 4, 2020 at 4:36 PM Miklos Szeredi <miklos@xxxxxxxxxx> wrote:

> I think we already lost that with the xattr API, that should have been
> done in a way that fits this philosophy. But given that we have "/"
> as the only special purpose char in filenames, and even repetitions
> are allowed, it's hard to think of a good way to do that. Pity.

One way this could be solved is to allow opting into an alternative
path resolution mode.

openat(AT_FDCWD, "foo/bar//mnt/info", O_RDONLY | O_ALT);

Yes, the implementation might be somewhat tricky, but that's another
question. Also I'm pretty sure that we should be reducing the
POSIX-ness of anything below "//" to the bare minimum. No seeking,

I think this would open up some nice possibilities beyond the fsinfo thing.