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ext4: Fix initalization of s_flex_groups

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The s_flex_groups array should have been initialized using atomic_add
to sum up the free counts from the block groups that make up a
flex_bg.  By using atomic_set, the value of the s_flex_groups array
was set to the values of the last block group in the flex_bg.  

The impact of this bug is that the block and inode allocation
algorithms might not pick the best flex_bg for new allocation.

Thanks to Damien Guibouret for pointing out this problem!

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2009-09-11 16:51:28 -04:00
parent 1f7bebb9e9
commit 7ad9bb651f
1 changed files with 6 additions and 6 deletions
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12
fs/ext4/super.c
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@ -1694,12 +1694,12 @@ static int ext4_fill_flex_info(struct super_block *sb)
gdp = ext4_get_group_desc(sb, i, NULL);
flex_group = ext4_flex_group(sbi, i);
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));
atomic_set(&sbi->s_flex_groups[flex_group].used_dirs,
ext4_used_dirs_count(sb, gdp));
atomic_add(ext4_free_inodes_count(sb, gdp),
&sbi->s_flex_groups[flex_group].free_inodes);
atomic_add(ext4_free_blks_count(sb, gdp),
&sbi->s_flex_groups[flex_group].free_blocks);
atomic_add(ext4_used_dirs_count(sb, gdp),
&sbi->s_flex_groups[flex_group].used_dirs);
}
return 1;