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| author | Theodore Ts'o <tytso@mit.edu> | 2009-02-06 16:23:37 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2009-02-06 16:23:37 -0500 |
| commit | e187c6588d6ef3169db53c389b3de9dfde3b16cc (patch) | |
| tree | 5ac50e38eecb58d8de571af0053331c31eb0a5e2 /fs/ext4/balloc.c | |
| parent | 074ca44283bf031678e67af7d82668bb03c55a55 (diff) | |
| download | lwn-e187c6588d6ef3169db53c389b3de9dfde3b16cc.tar.gz lwn-e187c6588d6ef3169db53c389b3de9dfde3b16cc.zip | |
ext4: remove call to ext4_group_desc() in ext4_group_used_meta_blocks()
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>
Diffstat (limited to 'fs/ext4/balloc.c')
| -rw-r--r-- | fs/ext4/balloc.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c index 38f40d55899c..b37b12875582 100644 --- a/fs/ext4/balloc.c +++ b/fs/ext4/balloc.c @@ -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); } |