Mike Snitzer b277da0a8a block: disable entropy contributions for nonrot devices ... Clear QUEUE_FLAG_ADD_RANDOM in all block drivers that set QUEUE_FLAG_NONROT. Historically, all block devices have automatically made entropy contributions. But as previously stated in commit e2e1a148 ("block: add sysfs knob for turning off disk entropy contributions"): - On SSD disks, the completion times aren't as random as they are for rotational drives. So it's questionable whether they should contribute to the random pool in the first place. - Calling add_disk_randomness() has a lot of overhead. There are more reliable sources for randomness than non-rotational block devices. From a security perspective it is better to err on the side of caution than to allow entropy contributions from unreliable "random" sources. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <axboe@fb.com>		2014-10-04 10:55:32 -06:00
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Kconfig	zram: add lz4 algorithm backend	2014-04-07 16:36:01 -07:00
Makefile	zram: add lz4 algorithm backend	2014-04-07 16:36:01 -07:00
zcomp_lz4.c	zram: add lz4 algorithm backend	2014-04-07 16:36:01 -07:00
zcomp_lz4.h	zram: add lz4 algorithm backend	2014-04-07 16:36:01 -07:00
zcomp_lzo.c	zram: introduce compressing backend abstraction	2014-04-07 16:36:01 -07:00
zcomp_lzo.h	zram: introduce compressing backend abstraction	2014-04-07 16:36:01 -07:00
zcomp.c	zram: use scnprintf() in attrs show() methods	2014-04-07 16:36:02 -07:00
zcomp.h	zram: propagate error to user	2014-04-07 16:36:02 -07:00
zram_drv.c	block: disable entropy contributions for nonrot devices	2014-10-04 10:55:32 -06:00
zram_drv.h	zram: replace global tb_lock with fine grain lock	2014-08-06 18:01:23 -07:00