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

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Date:   Mon, 31 Oct 2016 20:37:15 +0100
From:   Hannes Reinecke <hare@...e.de>
To:     Jens Axboe <axboe@...com>
Cc:     Christoph Hellwig <hch@....de>, Alexander Graf <agraf@...e.com>,
        Ming@...e.de, "Lei <tom.leiming"@gmail.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 for 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:
- Include reviews from Ming Lei

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

 drivers/block/loop.c      | 40 +++++++++++++++++++++++++++++++++-------
 drivers/block/loop.h      |  1 +
 include/uapi/linux/loop.h |  1 +
 3 files changed, 35 insertions(+), 7 deletions(-)

-- 
2.6.6