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Re: [PATCH] ext4: Give 32bit personalities 32bit hashes

From: Theodore Y. Ts'o
Subject: Re: [PATCH] ext4: Give 32bit personalities 32bit hashes
Date: Tue, 24 Mar 2020 14:47:54 -0400

On Tue, Mar 24, 2020 at 09:29:58AM +0000, Peter Maydell wrote:
> On the contrary, that would be a much better interface for QEMU.
> We always know when we're doing an open-syscall on behalf
> of the guest, and it would be trivial to make the fcntl() call then.
> That would ensure that we don't accidentally get the
> '32-bit semantics' on file descriptors QEMU opens for its own
> purposes, and wouldn't leave us open to the risk in future that
> setting the PER_LINUX32 flag for all of QEMU causes
> unexpected extra behaviour in future kernels that would be correct
> for the guest binary but wrong/broken for QEMU's own internals.

If using a flag set by fcntl is better for qemu, then by all means
let's go with that instead of using a personality flag/number.

Linus, do you have what you need to do a respin of the patch?

                                                 - Ted

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