linux-kernel - [PATCHv3 0/4] loop: enable different physical blocksizes

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Message-Id: <1447143190-44589-1-git-send-email-hare@suse.de>
Date:	Tue, 10 Nov 2015 09:13:06 +0100
From:	Hannes Reinecke <hare@...e.de>
To:	Jens Axboe <axboe@...com>
Cc:	Alexander Graf <agraf@...e.com>, Christoph Hellwig <hch@....de>,
	Ming Lei <tom.leiming@...il.com>, linux-kernel@...r.kernel.org,
	Hannes Reinecke <hare@...e.de>
Subject: [PATCHv3 0/4] loop: enable different physical blocksizes

Currently the loop driver just simulates 512-byte blocks. When
creating bootable images on virtual machines it might be required
to use a different physical blocksize (eg 4k for S/390 DASD), as
the some bootloaders (like lilo or zipl for S/390) need to know
the physical block addresses of the kernel and initrd.

This patchset extends the current LOOP_SET_STATUS64 ioctl to
set the logical and physical blocksize by re-using the existing
'init' fields, which are currently unused.

As usual, comments and reviews are welcome.

Changes to v1:
- Move LO_FLAGS_BLOCKSIZE definition
- Reshuffle patches

Changes to v2:
- Drop lo_flags setting in loop_set_fd as suggested by Ming Lei

Hannes Reinecke (4):
  loop: Enable correct physical blocksize
  loop: Remove unused 'bdev' argument from loop_set_capacity
  loop: Add 'lo_logical_blocksize'
  loop: Pass logical blocksize in 'lo_init[0]' ioctl field

 drivers/block/loop.c      | 41 ++++++++++++++++++++++++++++++++++-------
 drivers/block/loop.h      |  1 +
 include/uapi/linux/loop.h |  1 +
 3 files changed, 36 insertions(+), 7 deletions(-)

-- 
1.8.5.6

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