linux-kernel - Re: [PATCH v2 4/4] f2fs: stop checkpoint when get a out-of-bounds segment

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Message-ID: <ZcQdeC4e7rnr9pCr@google.com>
Date: Wed, 7 Feb 2024 16:16:56 -0800
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Zhiguo Niu <zhiguo.niu@...soc.com>
Cc: chao@...nel.org, linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, niuzhiguo84@...il.com,
	ke.wang@...soc.com, hongyu.jin@...soc.com
Subject: Re: [PATCH v2 4/4] f2fs: stop checkpoint when get a out-of-bounds
 segment

On 02/07, Zhiguo Niu wrote:
> There is low probability that an out-of-bounds segment will be got
> on a small-capacity device. In order to prevent subsequent write requests
> allocating block address from this invalid segment, which may cause
> unexpected issue, stop checkpoint should be performed.
> 
> Also introduce a new stop cp reason:  STOP_CP_REASON_OUTOF_RAGNE.

OUT_OF_RANGE?

> 
> Signed-off-by: Zhiguo Niu <zhiguo.niu@...soc.com>
> ---
>  fs/f2fs/segment.c       | 12 ++++++++++--
>  include/linux/f2fs_fs.h |  1 +
>  2 files changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index 6772ad4..6fe2baf 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -2666,7 +2666,11 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
>  		if (dir == ALLOC_RIGHT) {
>  			secno = find_first_zero_bit(free_i->free_secmap,
>  							MAIN_SECS(sbi));
> -			f2fs_bug_on(sbi, secno >= MAIN_SECS(sbi));
> +			if (secno >= MAIN_SECS(sbi)) {
> +				f2fs_stop_checkpoint(sbi, false,
> +						STOP_CP_REASON_OUTOF_RAGNE);
> +				f2fs_bug_on(sbi, 1);
> +			}
>  		} else {
>  			go_left = 1;
>  			left_start = hint - 1;
> @@ -2682,7 +2686,11 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
>  		}
>  		left_start = find_first_zero_bit(free_i->free_secmap,
>  							MAIN_SECS(sbi));
> -		f2fs_bug_on(sbi, left_start >= MAIN_SECS(sbi));
> +		if (left_start >= MAIN_SECS(sbi)) {
> +			f2fs_stop_checkpoint(sbi, false,
> +					STOP_CP_REASON_OUTOF_RAGNE);
> +			f2fs_bug_on(sbi, 1);
> +		}
>  		break;
>  	}
>  	secno = left_start;
> diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
> index 053137a0..72c6782 100644
> --- a/include/linux/f2fs_fs.h
> +++ b/include/linux/f2fs_fs.h
> @@ -81,6 +81,7 @@ enum stop_cp_reason {
>  	STOP_CP_REASON_CORRUPTED_SUMMARY,
>  	STOP_CP_REASON_UPDATE_INODE,
>  	STOP_CP_REASON_FLUSH_FAIL,
> +	STOP_CP_REASON_OUTOF_RAGNE,
>  	STOP_CP_REASON_MAX,
>  };
>  
> -- 
> 1.9.1