AcoSail/kernel_optimize_test
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ext4: remove call to ext4_group_desc() in ext4_group_used_meta_blocks()

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The static function ext4_group_used_meta_blocks() only has one caller,
who already has access to the block group's group descriptor.  So it's
better to have ext4_init_block_bitmap() pass the group descriptor to
ext4_group_used_meta_blocks(), so it doesn't need to call
ext4_group_desc().  Previously this function did not check if
ext4_group_desc() returned NULL due to an error, potentially causing a
kernel OOPS report.  This avoids the issue entirely.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2009-02-06 16:23:37 -05:00
parent 074ca44283
commit e187c6588d
1 changed files with 3 additions and 6 deletions
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9
fs/ext4/balloc.c
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@ -55,7 +55,8 @@ static int ext4_block_in_group(struct super_block *sb, ext4_fsblk_t block,
}
static int ext4_group_used_meta_blocks(struct super_block *sb,
ext4_group_t block_group)
ext4_group_t block_group,
struct ext4_group_desc *gdp)
{
ext4_fsblk_t tmp;
struct ext4_sb_info *sbi = EXT4_SB(sb);
@ -63,10 +64,6 @@ static int ext4_group_used_meta_blocks(struct super_block *sb,
int used_blocks = sbi->s_itb_per_group + 2;
if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) {
struct ext4_group_desc *gdp;
struct buffer_head *bh;
gdp = ext4_get_group_desc(sb, block_group, &bh);
if (!ext4_block_in_group(sb, ext4_block_bitmap(sb, gdp),
block_group))
used_blocks--;
@ -177,7 +174,7 @@ unsigned ext4_init_block_bitmap(struct super_block *sb, struct buffer_head *bh,
*/
mark_bitmap_end(group_blocks, sb->s_blocksize * 8, bh->b_data);
}
return free_blocks - ext4_group_used_meta_blocks(sb, block_group);
return free_blocks - ext4_group_used_meta_blocks(sb, block_group, gdp);
}