linux-ext4 - Re: [PATCH v11 02/16] xfs: only call xfs_setsize

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Message-ID: <20250506042242.GA26378@lst.de>
Date: Tue, 6 May 2025 06:22:42 +0200
From: Christoph Hellwig <hch@....de>
To: John Garry <john.g.garry@...cle.com>
Cc: "Darrick J. Wong" <djwong@...nel.org>, Christoph Hellwig <hch@....de>,
	brauner@...nel.org, viro@...iv.linux.org.uk, jack@...e.cz,
	cem@...nel.org, linux-fsdevel@...r.kernel.org, dchinner@...hat.com,
	linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	ojaswin@...ux.ibm.com, ritesh.list@...il.com,
	martin.petersen@...cle.com, linux-ext4@...r.kernel.org,
	linux-block@...r.kernel.org, catherine.hoang@...cle.com,
	linux-api@...r.kernel.org
Subject: Re: [PATCH v11 02/16] xfs: only call xfs_setsize_buftarg once per
 buffer target

On Mon, May 05, 2025 at 04:27:56PM +0100, John Garry wrote:
> On 05/05/2025 15:48, John Garry wrote:
>>>> @Darrick, please comment on whether happy with changes discussed.
>>> I put the sync_blockdev calls in a separate function so that the
>>> EIO/ENOSPC/whatever errors that come from the block device sync don't
>>> get morphed into ENOMEM by xfs_alloc_buftarg before being passed up.  I
>>> suppose we could make that function return an ERR_PTR, but I was trying
>>> to avoid making even more changes at the last minute, again.
>>
>> It seems simpler to just have the individual sync_blockdev() calls from 
>> xfs_alloc_buftarg(), rather than adding ERR_PTR() et al handling in both 
>> xfs_alloc_buftarg() and xfs_open_devices().
>
> Which of the following is better:

To me version 2 looks much better.  I had initial reservations as
ERR_PTR doesn't play well with userspace, but none of this code is
in libxfs, so that should be fine.