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From:   Chengguang Xu <cgxu519@mykernel.net>
To:     jack@suse.com
Cc:     linux-ext4@vger.kernel.org, Chengguang Xu <cgxu519@mykernel.net>
Message-ID: <20191104114036.9893-1-cgxu519@mykernel.net>
Subject: [PATCH 1/5] ext2: introduce new helper ext2_group_last_block_no()
Date:   Mon,  4 Nov 2019 19:40:32 +0800
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Sender: linux-ext4-owner@vger.kernel.org
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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.

Signed-off-by: Chengguang Xu <cgxu519@mykernel.net>
---
 fs/ext2/ext2.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index 10ab238de9a6..8178bd38a9d6 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -813,6 +813,18 @@ ext2_group_first_block_no(struct super_block *sb, unsi=
gned long group_no)
 =09=09le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block);
 }
=20
+static inline ext2_fsblk_t
+ext2_group_last_block_no(struct super_block *sb, unsigned long group_no)
+{
+=09struct ext2_sb_info *sbi =3D EXT2_SB(sb);
+
+=09if (group_no =3D=3D sbi->s_groups_count - 1)
+=09=09return le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
+=09else
+=09=09return ext2_group_first_block_no(sb, group_no) +
+=09=09=09EXT2_BLOCKS_PER_GROUP(sb) - 1;
+}
+
 #define ext2_set_bit=09__test_and_set_bit_le
 #define ext2_clear_bit=09__test_and_clear_bit_le
 #define ext2_test_bit=09test_bit_le
--=20
2.20.1