Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1202396

Re: [PATCH 0/4] loop: enable different physical blocksizes

Show all headers | View raw

On Fri, Aug 7, 2015 at 3:48 AM, Christoph Hellwig <hch@lst.de> wrote:
> On Fri, Aug 07, 2015 at 03:44:58AM -0400, Ming Lei wrote:
>> There shouldn't be any problem about looping over DASP which has
>> 4k sector size. Also for debugging purpose, we can easily emulate 4k
>> sector size disk by QEMU/virtio-blk.
>>
>> We can support 4k sector size on loop for debugging purpose too, but
>> the side effect is that some images can't be loop mounted any more
>> after its secror size is become larger, then people might complain that.
>
> Have you read the patches?
>
> There isn't any change in default behavior, but it allows you to expose
> a non-512 byte sector size _optionally_.  So no images will stop being
> loop mountable, quite to the contrary - you can now loop mount an image
> copied off from the 4k disk which otherwise would have been unusable
> because the file system geometry didn't match what's returned by
> the block layer as the sector size.

I mean the following case:

#losetup -B 4096 /dev/loop0 test.img
#mount /dev/loop0 /mnt
$...
#umount /mnt
#losetup -d /dev/loop0
#losetup /dev/loop0 test1.img
#mount /dev/loop0 /mnt

Then the last mount may fail becase the logical block size is still 4096.

Thanks,
Ming Lei
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: [PATCH 0/4] loop: enable different physical blocksizes Christoph Hellwig <hch@lst.de> - 2015-08-07 09:40 +0200
  Re: [PATCH 0/4] loop: enable different physical blocksizes Ming Lei <tom.leiming@gmail.com> - 2015-08-07 09:50 +0200
    Re: [PATCH 0/4] loop: enable different physical blocksizes Christoph Hellwig <hch@lst.de> - 2015-08-07 09:50 +0200
      Re: [PATCH 0/4] loop: enable different physical blocksizes Ming Lei <tom.leiming@gmail.com> - 2015-08-07 10:00 +0200
    Re: [PATCH 0/4] loop: enable different physical blocksizes Hannes Reinecke <hare@suse.de> - 2015-08-07 10:00 +0200

csiph-web