linux-kernel - Re: [PATCH -next v2 3/3] ext4: update 'state->fc_regions

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Message-ID: <20220921113227.g3zfv474tmpzfw75@quack3>
Date:   Wed, 21 Sep 2022 13:32:27 +0200
From:   Jan Kara <jack@...e.cz>
To:     Ye Bin <yebin10@...wei.com>
Cc:     tytso@....edu, adilger.kernel@...ger.ca,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        jack@...e.cz
Subject: Re: [PATCH -next v2 3/3] ext4: update 'state->fc_regions_size' after
 successful memory allocation

On Wed 21-09-22 14:40:40, Ye Bin wrote:
> To avoid to 'state->fc_regions_size' mismatch with 'state->fc_regions'
> when fail to reallocate 'fc_reqions',only update 'state->fc_regions_size'
> after 'state->fc_regions' is allocated successfully.
> 
> Signed-off-by: Ye Bin <yebin10@...wei.com>

Looks good. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  fs/ext4/fast_commit.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c
> index f5b0fc50ed47..694ab0627395 100644
> --- a/fs/ext4/fast_commit.c
> +++ b/fs/ext4/fast_commit.c
> @@ -1681,14 +1681,15 @@ int ext4_fc_record_regions(struct super_block *sb, int ino,
>  	if (state->fc_regions_used == state->fc_regions_size) {
>  		struct ext4_fc_alloc_region *fc_regions;
>  
> -		state->fc_regions_size +=
> -			EXT4_FC_REPLAY_REALLOC_INCREMENT;
>  		fc_regions = krealloc(state->fc_regions,
> -				      state->fc_regions_size *
> -				      sizeof(struct ext4_fc_alloc_region),
> +				      sizeof(struct ext4_fc_alloc_region) *
> +				      (state->fc_regions_size +
> +				       EXT4_FC_REPLAY_REALLOC_INCREMENT),
>  				      GFP_KERNEL);
>  		if (!fc_regions)
>  			return -ENOMEM;
> +		state->fc_regions_size +=
> +			EXT4_FC_REPLAY_REALLOC_INCREMENT;
>  		state->fc_regions = fc_regions;
>  	}
>  	region = &state->fc_regions[state->fc_regions_used++];
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR