From dd1f723bf56bd96efc9d90e9e60dc511c79de48f Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Fri, 8 Nov 2013 00:14:53 -0500 Subject: ext4: use prandom_u32() instead of get_random_bytes() Many of the uses of get_random_bytes() do not actually need cryptographically secure random numbers. Replace those uses with a call to prandom_u32(), which is faster and which doesn't consume entropy from the /dev/random driver. Signed-off-by: "Theodore Ts'o" --- fs/ext4/super.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) (limited to 'fs/ext4/super.c') diff --git a/fs/ext4/super.c b/fs/ext4/super.c index d3a857bf..c977f4e 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -3068,7 +3068,6 @@ static struct ext4_li_request *ext4_li_request_new(struct super_block *sb, { struct ext4_sb_info *sbi = EXT4_SB(sb); struct ext4_li_request *elr; - unsigned long rnd; elr = kzalloc(sizeof(*elr), GFP_KERNEL); if (!elr) @@ -3083,10 +3082,8 @@ static struct ext4_li_request *ext4_li_request_new(struct super_block *sb, * spread the inode table initialization requests * better. */ - get_random_bytes(&rnd, sizeof(rnd)); - elr->lr_next_sched = jiffies + (unsigned long)rnd % - (EXT4_DEF_LI_MAX_START_DELAY * HZ); - + elr->lr_next_sched = jiffies + (prandom_u32() % + (EXT4_DEF_LI_MAX_START_DELAY * HZ)); return elr; } -- cgit v1.1