linux-kernel - Re: [PATCH] ovl: disable IOCB_DIO_CALLER

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Message-Id: <20230925-perfide-enzianblau-5f6059909fd2@brauner>
Date:   Mon, 25 Sep 2023 11:38:03 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     Amir Goldstein <amir73il@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-unionfs@...r.kernel.org, Jens Axboe <axboe@...nel.dk>
Cc:     Christian Brauner <brauner@...nel.org>,
        Zorro Lang <zlang@...hat.com>
Subject: Re: [PATCH] ovl: disable IOCB_DIO_CALLER_COMP

On Mon, 25 Sep 2023 00:21:35 -0600, Jens Axboe wrote:
> overlayfs copies the kiocb flags when it sets up a new kiocb to handle
> a write, but it doesn't properly support dealing with the deferred
> caller completions of the kiocb. This means it doesn't get the final
> write completion value, and hence will complete the write with '0' as
> the result.
> 
> We could support the caller completions in overlayfs, but for now let's
> just disable them in the generated write kiocb.
> 
> [...]

Applied to the vfs.fixes branch of the vfs/vfs.git tree.
Patches in the vfs.fixes branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.fixes

[1/1] ovl: disable IOCB_DIO_CALLER_COMP
      https://git.kernel.org/vfs/vfs/c/2d1b3bbc3dd5