tree 91a8161cb09536ab838ef47fceabb0da0bea9256
parent 2ebca85abcfcbaaf1c0b242e39fc88ad3da90090
author David Woodhouse <David.Woodhouse@intel.com> 1218466722 +0100
committer Jens Axboe <jens.axboe@oracle.com> 1223535362 +0200

Add BLKDISCARD ioctl to allow userspace to discard sectors

We may well want mkfs tools to use this to mark the whole device as
unwanted before they format it, for example.

The ioctl takes a pair of uint64_ts, which are start offset and length
in _bytes_. Although at the moment it might make sense for them both to
be in 512-byte sectors, I don't want to limit the ABI to that.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>