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ext2: introduce new helper ext2_group_last_block_no()

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Introduce new helper ext2_group_last_block_no() to calculate
last block num for specific block group, we can replace open
coded logic by calling this common helper.

Link: https://lore.kernel.org/r/20191104114036.9893-1-cgxu519@mykernel.net
Signed-off-by: Chengguang Xu <cgxu519@mykernel.net>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Chengguang Xu 2019-11-04 19:40:32 +08:00 committed by Jan Kara
parent dae82c7fd0
commit eb9e47fc23
1 changed files with 12 additions and 0 deletions
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12
fs/ext2/ext2.h
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@ -813,6 +813,18 @@ ext2_group_first_block_no(struct super_block *sb, unsigned long group_no)
le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block);
}
static inline ext2_fsblk_t
ext2_group_last_block_no(struct super_block *sb, unsigned long group_no)
{
struct ext2_sb_info *sbi = EXT2_SB(sb);
if (group_no == sbi->s_groups_count - 1)
return le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
else
return ext2_group_first_block_no(sb, group_no) +
EXT2_BLOCKS_PER_GROUP(sb) - 1;
}
#define ext2_set_bit __test_and_set_bit_le
#define ext2_clear_bit __test_and_clear_bit_le
#define ext2_test_bit test_bit_le