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List: linux-fsdevel
Subject: Re: [PATCH 4/7] swapon(2): open swap with O_EXCL
From: Al Viro <viro () zeniv ! linux ! org ! uk>
Date: 2024-04-28 19:07:09
Message-ID: 20240428190709.GX2118490 () ZenIV
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On Sun, Apr 28, 2024 at 11:46:05AM -0700, Linus Torvalds wrote:
> On Sun, 28 Apr 2024 at 11:19, Al Viro <viro@zeniv.linux.org.uk> wrote:
> >
> > FWIW, pretty much the same can be done with zram - open with O_EXCL and to
> > hell with reopening. Guys, are there any objections to that?
>
> Please do. The fewer of these strange "re-open block device" things we
> have, the better.
>
> I particularly dislike our "holder" logic, and this re-opening is one
> source of nasty confusion, and if we could replace them all with just
> the "O_EXCL uses the file itself as the holder", that would be
> absolutely _lovely_.
The tricky part is blk_holder_ops, and I'm no fonder of it than you are.
Christoph, do you have any plans along those lines for swap devices?
If they are not going to grow holder_ops, I'd say we should switch
to O_EXCL open and be done with that; zram is in the same situation,
AFAICS.
Might be worth a topic at LSF, actually...
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