On 04/13/2016 07:23 AM, Hannes Reinecke wrote:
So I wonder if we should plumb this into blkdev_issue_zeroout(), not blk_issue_discard().
That's an excellent question. Let's take a step back and look at the functionality that is exposed to user space. What should the behavior of the BLKDISCARD and BLKSECDISCARD ioctls be if the start and/or end sectors are not aligned? My patch ensures that these ioctls do something meaningful if the start and/or end sector are not aligned on a discard boundary. Is that the behavior we want or should rather we make these ioctls fail if the start and/or end sectors are not aligned?
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