linux-ext4 - Re: [PATCH v2 3/4] ext2fs: rename "s_overhead_blocks" to "s_overhead

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Date:   Sun, 25 Aug 2019 21:13:17 -0600
From:   Andreas Dilger <adilger@...ger.ca>
To:     Dongyang Li <dongyangli@....com>
Cc:     Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH v2 3/4] ext2fs: rename "s_overhead_blocks" to
 "s_overhead_clusters"

On Aug 22, 2019, at 2:26 AM, Dongyang Li <dongyangli@....com> wrote:
> 
> Rename s_overhead_blocks field from struct ext2_super_block to
> make it consistent with the kernel counterpart.
> 
> Signed-off-by: Li Dongyang <dongyangli@....com>

Reviewed-by: Andreas Dilger <adilger@...ger.ca>

with one minor comment/question below...

> ---
> debugfs/set_fields.c        | 2 +-
> lib/e2p/ls.c                | 6 +++---
> lib/ext2fs/ext2_fs.h        | 2 +-
> lib/ext2fs/swapfs.c         | 2 +-
> lib/ext2fs/tst_super_size.c | 2 +-
> 5 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/debugfs/set_fields.c b/debugfs/set_fields.c
> index 5142554d..f497bd92 100644
> --- a/debugfs/set_fields.c
> +++ b/debugfs/set_fields.c
> @@ -160,7 +160,7 @@ static struct field_set_info super_fields[] = {
> 	{ "usr_quota_inum", &set_sb.s_usr_quota_inum, NULL, 4, parse_uint },
> 	{ "grp_quota_inum", &set_sb.s_grp_quota_inum, NULL, 4, parse_uint },
> 	{ "prj_quota_inum", &set_sb.s_prj_quota_inum, NULL, 4, parse_uint },
> -	{ "overhead_blocks", &set_sb.s_overhead_blocks, NULL, 4, parse_uint },
> +	{ "overhead_clusters", &set_sb.s_overhead_clusters, NULL, 4, parse_uint },

Should we consider to keep the "overhead_blocks" name for compatibility?  It
should be listed second, after "overhead_clusters", maybe with a comment.

> 	{ "backup_bgs", &set_sb.s_backup_bgs[0], NULL, 4, parse_uint,
> 	  FLAG_ARRAY, 2 },
> 	{ "checksum", &set_sb.s_checksum, NULL, 4, parse_uint },
> diff --git a/lib/e2p/ls.c b/lib/e2p/ls.c
> index 5a446178..5ca750f6 100644
> --- a/lib/e2p/ls.c
> +++ b/lib/e2p/ls.c
> @@ -272,9 +272,9 @@ void list_super2(struct ext2_super_block * sb, FILE *f)
> 	fprintf(f, "Inode count:              %u\n", sb->s_inodes_count);
> 	fprintf(f, "Block count:              %llu\n", e2p_blocks_count(sb));
> 	fprintf(f, "Reserved block count:     %llu\n", e2p_r_blocks_count(sb));
> -	if (sb->s_overhead_blocks)
> -		fprintf(f, "Overhead blocks:          %u\n",
> -			sb->s_overhead_blocks);
> +	if (sb->s_overhead_clusters)
> +		fprintf(f, "Overhead clusters:          %u\n",
> +			sb->s_overhead_clusters);
> 	fprintf(f, "Free blocks:              %llu\n", e2p_free_blocks_count(sb));
> 	fprintf(f, "Free inodes:              %u\n", sb->s_free_inodes_count);
> 	fprintf(f, "First block:              %u\n", sb->s_first_data_block);
> diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
> index cbb44bdb..5737dc61 100644
> --- a/lib/ext2fs/ext2_fs.h
> +++ b/lib/ext2fs/ext2_fs.h
> @@ -742,7 +742,7 @@ struct ext2_super_block {
> /*200*/	__u8	s_mount_opts[64];
> /*240*/	__u32	s_usr_quota_inum;	/* inode number of user quota file */
> 	__u32	s_grp_quota_inum;	/* inode number of group quota file */
> -	__u32	s_overhead_blocks;	/* overhead blocks/clusters in fs */
> +	__u32	s_overhead_clusters;	/* overhead blocks/clusters in fs */
> /*24c*/	__u32	s_backup_bgs[2];	/* If sparse_super2 enabled */
> /*254*/	__u8	s_encrypt_algos[4];	/* Encryption algorithms in use  */
> /*258*/	__u8	s_encrypt_pw_salt[16];	/* Salt used for string2key algorithm */
> diff --git a/lib/ext2fs/swapfs.c b/lib/ext2fs/swapfs.c
> index a1560045..63b24330 100644
> --- a/lib/ext2fs/swapfs.c
> +++ b/lib/ext2fs/swapfs.c
> @@ -121,7 +121,7 @@ void ext2fs_swap_super(struct ext2_super_block * sb)
> 	/* sb->s_mount_opts is __u8 and does not need swabbing */
> 	sb->s_usr_quota_inum = ext2fs_swab32(sb->s_usr_quota_inum);
> 	sb->s_grp_quota_inum = ext2fs_swab32(sb->s_grp_quota_inum);
> -	sb->s_overhead_blocks = ext2fs_swab32(sb->s_overhead_blocks);
> +	sb->s_overhead_clusters = ext2fs_swab32(sb->s_overhead_clusters);
> 	sb->s_backup_bgs[0] = ext2fs_swab32(sb->s_backup_bgs[0]);
> 	sb->s_backup_bgs[1] = ext2fs_swab32(sb->s_backup_bgs[1]);
> 	/* sb->s_encrypt_algos is __u8 and does not need swabbing */
> diff --git a/lib/ext2fs/tst_super_size.c b/lib/ext2fs/tst_super_size.c
> index a932685d..ab38dd59 100644
> --- a/lib/ext2fs/tst_super_size.c
> +++ b/lib/ext2fs/tst_super_size.c
> @@ -135,7 +135,7 @@ int main(int argc, char **argv)
> 	check_field(s_mount_opts, 64);
> 	check_field(s_usr_quota_inum, 4);
> 	check_field(s_grp_quota_inum, 4);
> -	check_field(s_overhead_blocks, 4);
> +	check_field(s_overhead_clusters, 4);
> 	check_field(s_backup_bgs, 8);
> 	check_field(s_encrypt_algos, 4);
> 	check_field(s_encrypt_pw_salt, 16);
> --
> 2.22.1
> 


Cheers, Andreas






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