Re: [PATCH v2 0/6] gfs2: Fix mmap + page fault deadlocks

[Al Viro]

On Mon, Jul 19, 2021 at 12:39:26AM +0200, Andreas Gruenbacher wrote:
> Hi Linus et al.,
> 
> here's an update to the gfs2 mmap + page faults fix that implements
> Linus's suggestion of disabling page faults while we're holding the
> inode glock.
> 
> This passes fstests except for test generic/095, which fails due to an
> independent bug in the iov_iter code.  I'm currently trying to get
> initial feedback from Al and Christoph on that.
> 
> Any feedback would be welcome.

What tree is that against?  Because in mainline your #5 sure as hell
won't apply...

There uio.h has
enum iter_type {
        /* iter types */
        ITER_IOVEC,
        ITER_KVEC,
        ITER_BVEC,
        ITER_PIPE,
        ITER_XARRAY,
        ITER_DISCARD,
};

and your series assumes

enum iter_type {
        /* iter types */
        ITER_IOVEC = 4,
        ITER_KVEC = 8,
        ITER_BVEC = 16,
        ITER_PIPE = 32,
        ITER_DISCARD = 64,
};

What had that been tested with?