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| author | Theodore Ts'o <tytso@mit.edu> | 2009-09-11 16:51:28 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2009-09-11 16:51:28 -0400 |
| commit | 7ad9bb651fc2036ea94bed94da76a4b08959a911 (patch) | |
| tree | 2669266f02c35b1b24d13d0adc4b3ac5afbdf7fd | |
| parent | 1f7bebb9e911d870fa8f997ddff838e82b5715ea (diff) | |
| download | blackbird-op-linux-7ad9bb651fc2036ea94bed94da76a4b08959a911.tar.gz blackbird-op-linux-7ad9bb651fc2036ea94bed94da76a4b08959a911.zip | |
ext4: Fix initalization of s_flex_groups
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>
| -rw-r--r-- | fs/ext4/super.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 9f6fa3f74629..04c693357336 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -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; |
