Re: [PATCH] block: bios with an offset are always gappy

[Johannes Thumshirn]

On Thu, Apr 13, 2017 at 11:48:35AM +0200, Christoph Hellwig wrote:
> On Thu, Apr 13, 2017 at 10:06:29AM +0200, Johannes Thumshirn wrote:
> > Doing a mkfs.btrfs on a (qemu emulated) PCIe NVMe causes a kernel panic
> > in nvme_setup_prps() because the dma_len will drop below zero but the
> > length not.
> 
> I think we should also turns this into a WARN_ON_ONCE + error return..
> 
> But do you have an exact btrfsprogs version and command line?  I do a lot
> of testing that involves mkfs.btrfs on nvme and haven't seen it..

Ah one detail I forgot: mkfs.xfs _does_ work. Haven't checked ext4 though.

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Johannes Thumshirn                                          Storage
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