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"Darrick" == Darrick J Wong [off-list ref] writes:

Darrick> Create a new ioctl to expose the block layer's newfound ability
Darrick> to issue either a zeroing discard, a WRITE SAME with a zero
Darrick> page, or a regular write with the zero page.  This BLKZEROOUT2
Darrick> ioctl takes {start, length, flags} as parameters.  So far, the
Darrick> only flag available is to enable the zeroing discard part --
Darrick> without it, the call invokes the old BLKZEROOUT behavior.
Darrick> start and length have the same meaning as in BLKZEROOUT.

Darrick> This new ioctl also invalidates the page cache correctly on
Darrick> account of the previous patch in the series.

Reviewed-by: Martin K. Petersen <redacted>

-- 
Martin K. Petersen	Oracle Linux Engineering