linux-kernel - Re: [PATCH 02/21] ext4: allow to find by goal if EXT4_MB_HINT_GOAL

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Message-ID: <Y+nfR+5egaE46Mrd@li-bb2b2a4c-3307-11b2-a85c-8fa5c3a69313.ibm.com>
Date:   Mon, 13 Feb 2023 12:27:11 +0530
From:   Ojaswin Mujoo <ojaswin@...ux.ibm.com>
To:     Kemeng Shi <shikemeng@...weicloud.com>
Cc:     tytso@....edu, adilger.kernel@...ger.ca, jack@...e.cz,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/21] ext4: allow to find by goal if
 EXT4_MB_HINT_GOAL_ONLY is set

On Fri, Feb 10, 2023 at 03:48:06AM +0800, Kemeng Shi wrote:
> If EXT4_MB_HINT_GOAL_ONLY is set, ext4_mb_regular_allocator will only
> allocate blocks from ext4_mb_find_by_goal. Allow to find by goal in
> ext4_mb_find_by_goal if EXT4_MB_HINT_GOAL_ONLY is set or allocation
> with EXT4_MB_HINT_GOAL_ONLY set will always fail.
> 
> EXT4_MB_HINT_GOAL_ONLY is not used at all, so the problem is not
> found for now.
> 
> Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
> ---
>  fs/ext4/mballoc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index 0650a1dc870e..375d9655b525 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -2162,7 +2162,7 @@ int ext4_mb_find_by_goal(struct ext4_allocation_context *ac,
>  	struct ext4_group_info *grp = ext4_get_group_info(ac->ac_sb, group);
>  	struct ext4_free_extent ex;
>  
> -	if (!(ac->ac_flags & EXT4_MB_HINT_TRY_GOAL))
> +	if (!(ac->ac_flags & (EXT4_MB_HINT_TRY_GOAL | EXT4_MB_HINT_GOAL_ONLY)))
>  		return 0;
>  	if (grp->bb_free == 0)
>  		return 0;
Looks good to me, feel free to add:

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