Re: [PATCH] block: correctly fallback for zeroout

[Christoph Hellwig]

On Thu, May 26, 2016 at 11:08:14AM -0700, Shaohua Li wrote:
> -int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
> -		sector_t nr_sects, gfp_t gfp_mask, unsigned long flags)
> +static int do_blkdev_issue_discard(struct block_device *bdev, sector_t sector,

We've split blkdev_issue_discard into __blkdev_issue_discard and a small
wrapper around in for 4.7, so this will need a bit of an update.

As part of that I also removed the strange EOPNOTSUPP ignore, but Mike
reverted it just because it changed something in the dm testsuite.

I still believe we should never ignore it in this helper, and only
do so in callers that believe it's the right thing.