RE: [PATCH v4] block: create ioctl to discard-or-zeroout a range of blocks

[Seymour, Shane M]

> v4: Check the start/len arguments for overflows prior to feeding the page
>     cache bogus numbers (that it'll ignore anyway).

> Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>

Reviewed-by: Shane Seymour <shane.seymour@xxxxxxx>
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