On Fri, Aug 7, 2015 at 3:48 AM, Christoph Hellwig <[email protected]> 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 [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
