|To:||Christoph Hellwig <hch@xxxxxxxxxxxxx>|
|Subject:||Re: [PATCH RFC] xfs: set block device logical sector size on xfs_buftarg|
|From:||Ric Wheeler <rwheeler@xxxxxxxxxx>|
|Date:||Fri, 22 Nov 2013 09:26:43 -0500|
|Cc:||Dave Chinner <david@xxxxxxxxxxxxx>, Eric Sandeen <sandeen@xxxxxxxxxxx>, Eric Sandeen <sandeen@xxxxxxxxxx>, xfs-oss <xfs@xxxxxxxxxxx>|
|References:||<5283C41D.7070503@xxxxxxxxxx> <20131113185645.GA20869@xxxxxxxxxxxxx> <5283CE2E.2070702@xxxxxxxxxxx> <20131113212658.GJ6188@dastard> <20131114133749.GA26268@xxxxxxxxxxxxx> <5284E484.6090001@xxxxxxxxxxx> <20131114210156.GP6188@dastard> <528F66A4.7060200@xxxxxxxxxx> <20131122142022.GC14680@xxxxxxxxxxxxx>|
|User-agent:||Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.0|
On 11/22/2013 09:20 AM, Christoph Hellwig wrote:
On Fri, Nov 22, 2013 at 09:13:56AM -0500, Ric Wheeler wrote:I think you do that by using SCSI debug to get a 4K sector drive - that is how we tested for RHEL6 for example. Layering on restrictions to hardware in the file system seems a bit harsh. The QEMU crowd will be working to get better support for 4K drives in the future, but I think that we are effectively going to cause a huge field issue here since these 512/4K drives are extremely common.. Given the SCSI debug method for this, does that mean you retract your objections and will support Eric's patch :) ?We actually have a test for 4k drives using scsi_debug in xfstests: xfs/279.
Just to add on here. we are going to work more closely with the kvm/qemu people to make sure that they properly take care of the hints about alignment and so on (thanks to you for putting that in!).
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