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ext2/3: use prandom_u32() instead of get_random_bytes()

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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.

The commit dd1f723bf5 has made that for
ext4, and i did the same for ext2/3.

Signed-off-by: Zhang Zhen <zhenzhang.zhang@huawei.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
ZhangZhen 2014-02-26 10:32:41 +08:00 committed by Jan Kara
parent 4ddb987a47
commit e878167af9
2 changed files with 2 additions and 2 deletions
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2
fs/ext2/ialloc.c
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@ -284,7 +284,7 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent)
int best_ndir = inodes_per_group; int best_ndir = inodes_per_group;
int best_group = -1; int best_group = -1;
get_random_bytes(&group, sizeof(group)); group = prandom_u32();
parent_group = (unsigned)group % ngroups; parent_group = (unsigned)group % ngroups;
for (i = 0; i < ngroups; i++) { for (i = 0; i < ngroups; i++) {
group = (parent_group + i) % ngroups; group = (parent_group + i) % ngroups;

2
fs/ext3/ialloc.c
View File

@ -215,7 +215,7 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent)
int best_ndir = inodes_per_group; int best_ndir = inodes_per_group;
int best_group = -1; int best_group = -1;
get_random_bytes(&group, sizeof(group)); group = prandom_u32();
parent_group = (unsigned)group % ngroups; parent_group = (unsigned)group % ngroups;
for (i = 0; i < ngroups; i++) { for (i = 0; i < ngroups; i++) {
group = (parent_group + i) % ngroups; group = (parent_group + i) % ngroups;