linux-kernel - Re: [PATCH 2/4] f2fs: fix to don't call f2fs_stop

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Date: Tue, 27 Feb 2024 09:50:17 -0800
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Chao Yu <chao@...nel.org>
Cc: linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] f2fs: fix to don't call f2fs_stop_checkpoint in
 spinlock coverage

On 02/22, Chao Yu wrote:
> f2fs_stop_checkpoint(, false) is complex and it may sleep, so we should
> move it outside segmap_lock spinlock coverage in get_new_segment().

Chao, I merged this patch into

https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git/commit/?h=dev-test&id=f3b576d209983b5d6e1cb130bfc8ca1f0bbcad6d

> 
> Signed-off-by: Chao Yu <chao@...nel.org>
> ---
>  fs/f2fs/segment.c | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index d0209ea77dd2..8edc42071e6f 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -2646,6 +2646,7 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
>  	unsigned int old_zoneno = GET_ZONE_FROM_SEG(sbi, *newseg);
>  	bool init = true;
>  	int i;
> +	int ret = 0;
>  
>  	spin_lock(&free_i->segmap_lock);
>  
> @@ -2671,9 +2672,8 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
>  		secno = find_first_zero_bit(free_i->free_secmap,
>  							MAIN_SECS(sbi));
>  		if (secno >= MAIN_SECS(sbi)) {
> -			f2fs_stop_checkpoint(sbi, false,
> -				STOP_CP_REASON_NO_SEGMENT);
> -			f2fs_bug_on(sbi, 1);
> +			ret = -ENOSPC;
> +			goto out_unlock;
>  		}
>  	}
>  	segno = GET_SEG_FROM_SEC(sbi, secno);
> @@ -2704,7 +2704,13 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
>  	f2fs_bug_on(sbi, test_bit(segno, free_i->free_segmap));
>  	__set_inuse(sbi, segno);
>  	*newseg = segno;
> +out_unlock:
>  	spin_unlock(&free_i->segmap_lock);
> +
> +	if (ret) {
> +		f2fs_stop_checkpoint(sbi, false, STOP_CP_REASON_NO_SEGMENT);
> +		f2fs_bug_on(sbi, 1);
> +	}
>  }
>  
>  static void reset_curseg(struct f2fs_sb_info *sbi, int type, int modified)
> -- 
> 2.40.1