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linux/drivers/md/bcache
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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
..
alloc.c bcache allocator: send discards with correct size 2014-08-04 15:23:03 -07:00
bcache.h bcache: fix crash with incomplete cache set 2014-08-04 15:23:04 -07:00
bset.c bcache: Allocate bounce buffers with GFP_NOWAIT 2014-08-04 15:23:03 -07:00
bset.h bcache: fix typo in bch_bkey_equal_header 2014-08-04 15:23:03 -07:00
btree.c bcache: try to set b->parent properly 2014-08-04 15:23:04 -07:00
btree.h bcache: try to set b->parent properly 2014-08-04 15:23:04 -07:00
closure.c bcache: kill closure locking code 2014-01-08 13:05:08 -08:00
closure.h arch: Mass conversion of smp_mb__*() 2014-04-18 14:20:48 +02:00
debug.c bcache: Convert debug code to btree_keys 2014-01-08 13:05:13 -08:00
debug.h bcache: Convert debug code to btree_keys 2014-01-08 13:05:13 -08:00
extents.c bcache: Fix a journal replay bug 2014-08-04 15:23:02 -07:00
extents.h bcache: Fix a journal replay bug 2014-08-04 15:23:02 -07:00
io.c block: Introduce new bio_split() 2013-11-23 22:33:57 -08:00
journal.c bcache: Fix an infinite loop in journal replay 2014-08-04 15:23:03 -07:00
journal.h bcache: Fix a shutdown bug 2014-02-25 18:42:49 -08:00
Kconfig bcache: Kill dead cgroup code 2014-03-18 12:22:35 -07:00
Makefile bcache: Abstract out stuff needed for sorting 2014-01-08 13:05:12 -08:00
movinggc.c bcache: stop moving_gc marking buckets that can't be moved. 2014-03-18 12:22:34 -07:00
request.c bcache: bcache_write tracepoint was crashing 2014-08-04 15:23:03 -07:00
request.h bcache: Kill dead cgroup code 2014-03-18 12:22:35 -07:00
stats.c bcache: Kill dead cgroup code 2014-03-18 12:22:35 -07:00
stats.h bcache: Break up struct search 2013-11-10 21:56:32 -08:00
super.c block: disable entropy contributions for nonrot devices 2014-10-04 10:55:32 -06:00
sysfs.c bcache: remove nested function usage 2014-03-18 12:39:28 -07:00
sysfs.h bcache: Don't export utility code, prefix with bch_ 2013-03-28 12:50:55 -06:00
trace.c bcache: Better alloc tracepoints 2014-03-18 12:22:35 -07:00
util.c Linux 3.13-rc6 2013-12-31 09:51:02 -07:00
util.h bcache: Correct printing of btree_gc_max_duration_ms 2014-08-04 15:23:04 -07:00
writeback.c bcache: fix uninterruptible sleep in writeback thread 2014-08-04 15:23:03 -07:00
writeback.h bcache: fix uninterruptible sleep in writeback thread 2014-08-04 15:23:03 -07:00