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

From: Hannes Reinecke
Date: Tue Nov 10 2015 - 03:13:26 EST

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(-)


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