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From: Kevin Wolf <kwolf@redhat.com>
To: Max Reitz <mreitz@redhat.com>
Cc: qemu-devel@nongnu.org, qemu-block@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] block/file-posix: Truncate in xfs_write_zeroes()
Date: Mon, 13 May 2019 13:08:23 +0200	[thread overview]
Message-ID: <20190513110823.GA19114@linux.fritz.box> (raw)
In-Reply-To: <20190510211244.26461-1-mreitz@redhat.com>

Am 10.05.2019 um 23:12 hat Max Reitz geschrieben:
> XFS_IOC_ZERO_RANGE does not increase the file length:
> $ touch foo
> $ xfs_io -c 'zero 0 65536' foo
> $ stat -c "size=%s, blocks=%b" foo
> size=0, blocks=128
> 
> We do want writes beyond the EOF to automatically increase the file
> length, however.  This is evidenced by the fact that iotest 061 is
> broken on XFS since qcow2's check implementation checks for blocks
> beyond the EOF.
> 
> Reported-by: Kevin Wolf <kwolf@redhat.com>
> Signed-off-by: Max Reitz <mreitz@redhat.com>

Just for the record, the commit that made the problem visible in 061 is
commit a5fff8d4.

Thanks, applied to the block branch.

Though I wonder if we should prefer FALLOC_FL_ZERO_RANGE now if
available, which is a single syscall and consistent for all filesystems.

Kevin


      reply	other threads:[~2019-05-13 11:09 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-10 21:12 [Qemu-devel] [PATCH] block/file-posix: Truncate in xfs_write_zeroes() Max Reitz
2019-05-13 11:08 ` Kevin Wolf [this message]

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