Re: [RFC][PATCH 0/3] vfs: Use an xarray instead of inserted bookmarks to scan mount list

[Miklos Szeredi]

On Mon, Mar 15, 2021 at 1:07 PM David Howells <dhowells@xxxxxxxxxx> wrote:
>
>
> Hi Al, Miklós,
>
> Can we consider replacing the "insert cursor" approach we're currently
> using for proc files to scan the current namespace's mount list[1] with
> something that uses an xarray of mounts indexed by mnt_id?
>
> This has some advantages:
>
>  (1) It's simpler.  We don't need to insert dummy mount objects as
>      bookmarks into the mount list and code that's walking the list doesn't
>      have to carefully step over them.
>
>  (2) We can use the file position to represent the mnt_id and can jump to
>      it directly - ie. using seek() to jump to a mount object by its ID.

What happens if the mount at the current position is removed?

Thanks,
Miklos