ext4: Use atomic_t's in struct flex_groups
Reduce pressure on the sb_bgl_lock family of locks by using atomic_t's
to track the number of free blocks and inodes in each flex_group.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 1ec554c..6b5d5c6 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1630,10 +1630,10 @@
gdp = ext4_get_group_desc(sb, i, &bh);
flex_group = ext4_flex_group(sbi, i);
- sbi->s_flex_groups[flex_group].free_inodes +=
- ext4_free_inodes_count(sb, gdp);
- sbi->s_flex_groups[flex_group].free_blocks +=
- ext4_free_blks_count(sb, gdp);
+ atomic_set(&sbi->s_flex_groups[flex_group].free_inodes,
+ ext4_free_inodes_count(sb, gdp));
+ atomic_set(&sbi->s_flex_groups[flex_group].free_blocks,
+ ext4_free_blks_count(sb, gdp));
}
return 1;