linux-kernel - Re: [PATCH 2/8] ext4: fix unit mismatch in ext4_mb_new_blocks

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Message-ID: <ZC/4Dz25RsMce9do@li-bb2b2a4c-3307-11b2-a85c-8fa5c3a69313.ibm.com>
Date:   Fri, 7 Apr 2023 16:31:35 +0530
From:   Ojaswin Mujoo <ojaswin@...ux.ibm.com>
To:     Kemeng Shi <shikemeng@...weicloud.com>
Cc:     tytso@....edu, adilger.kernel@...ger.ca,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/8] ext4: fix unit mismatch in ext4_mb_new_blocks_simple

On Wed, Mar 22, 2023 at 12:12:14AM +0800, Kemeng Shi wrote:
> The "i" returned from mb_find_next_zero_bit is in cluster unit and we
> need offset "block" corresponding to "i" in block unit. Convert "i" to
> block unit to fix the unit mismatch.
> 
> Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>

Feel free to add:

Reviewed-by: Ojaswin Mujoo <ojaswin@...ux.ibm.com>

Regards,
ojaswin

> ---
>  fs/ext4/mballoc.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index 6318c763a239..7f695830621a 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -5761,6 +5761,7 @@ static ext4_fsblk_t ext4_mb_new_blocks_simple(handle_t *handle,
>  {
>  	struct buffer_head *bitmap_bh;
>  	struct super_block *sb = ar->inode->i_sb;
> +	struct ext4_sb_info *sbi = EXT4_SB(sb);
>  	ext4_group_t group;
>  	ext4_grpblk_t blkoff;
>  	ext4_grpblk_t max = EXT4_CLUSTERS_PER_GROUP(sb);
> @@ -5789,7 +5790,8 @@ static ext4_fsblk_t ext4_mb_new_blocks_simple(handle_t *handle,
>  			if (i >= max)
>  				break;
>  			if (ext4_fc_replay_check_excluded(sb,
> -				ext4_group_first_block_no(sb, group) + i)) {
> +				ext4_group_first_block_no(sb, group) +
> +				EXT4_C2B(sbi, i))) {
>  				blkoff = i + 1;
>  			} else
>  				break;
> @@ -5806,7 +5808,7 @@ static ext4_fsblk_t ext4_mb_new_blocks_simple(handle_t *handle,
>  		return 0;
>  	}
>  
> -	block = ext4_group_first_block_no(sb, group) + i;
> +	block = ext4_group_first_block_no(sb, group) + EXT4_C2B(sbi, i);
>  	ext4_mb_mark_bb(sb, block, 1, 1);
>  	ar->len = 1;
>  
> -- 
> 2.30.0
>