block: Invalidate cache on discard v2

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It is reasonable drop page cache on discard, otherwise that pages may
be written by writeback second later, so thin provision devices will
not be happy. This seems to be a  security leak in case of secure discard case.

Also add check for queue_discard flag on early stage.

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Dmitry Monakhov 2017-10-24 18:44:57 -06:00 • committed by Jens Axboe

parent 75bc5f0661

commit 351499a172

1 changed files with 10 additions and 4 deletions

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block/ioctl.c

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