loop: support 4k physical blocksize

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When generating bootable VM images certain systems (most notably
s390x) require devices with 4k blocksize. This patch implements
a new flag 'LO_FLAGS_BLOCKSIZE' which will set the physical
blocksize to that of the underlying device, and allow to change
the logical blocksize for up to the physical blocksize.

Signed-off-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

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Hannes Reinecke 2017-06-08 13:46:45 +02:00 • committed by Jens Axboe

parent 51001b7da3

commit f2c6df7dbf

3 changed files with 41 additions and 6 deletions

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43

drivers/block/loop.c

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1

drivers/block/loop.h

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3

include/uapi/linux/loop.h

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