linux-kernel - Re: [f2fs-dev] [PATCH 2/7] f2fs: add quick mode of checkpoint=disable for QA

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Message-ID: <2221688e-4dfc-71d5-81c6-3cf12d18e64a@kernel.org>
Date:   Fri, 1 Feb 2019 23:48:18 +0800
From:   Chao Yu <chao@...nel.org>
To:     Jaegeuk Kim <jaegeuk@...nel.org>, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH 2/7] f2fs: add quick mode of checkpoint=disable
 for QA

On 2019-1-29 7:47, Jaegeuk Kim wrote:
> This mode returns mount() quickly with EAGAIN. We can trigger this by
> shutdown(F2FS_GOING_DOWN_NEED_FSCK).

Is the purpose of this patch making mount failed more quickly due to giving less
GC time in f2fs_disable_checkpoint(), so we can expect that the total test time
can be reduce?

Thanks,

> 
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> ---
>  fs/f2fs/checkpoint.c    | 5 +++++
>  fs/f2fs/f2fs.h          | 2 ++
>  fs/f2fs/file.c          | 6 +++---
>  fs/f2fs/segment.c       | 3 +++
>  fs/f2fs/super.c         | 5 +++++
>  include/linux/f2fs_fs.h | 1 +
>  6 files changed, 19 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> index f955cd3e0677..622dca707752 100644
> --- a/fs/f2fs/checkpoint.c
> +++ b/fs/f2fs/checkpoint.c
> @@ -1259,6 +1259,11 @@ static void update_ckpt_flags(struct f2fs_sb_info *sbi, struct cp_control *cpc)
>  	else
>  		__clear_ckpt_flags(ckpt, CP_DISABLED_FLAG);
>  
> +	if (is_sbi_flag_set(sbi, SBI_CP_DISABLED_QUICK))
> +		__set_ckpt_flags(ckpt, CP_DISABLED_QUICK_FLAG);
> +	else
> +		__clear_ckpt_flags(ckpt, CP_DISABLED_QUICK_FLAG);
> +
>  	if (is_sbi_flag_set(sbi, SBI_QUOTA_SKIP_FLUSH))
>  		__set_ckpt_flags(ckpt, CP_QUOTA_NEED_FSCK_FLAG);
>  	else
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 6b6ec5600089..fe95abb05d40 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -191,6 +191,7 @@ enum {
>  #define DEF_CP_INTERVAL			60	/* 60 secs */
>  #define DEF_IDLE_INTERVAL		5	/* 5 secs */
>  #define DEF_DISABLE_INTERVAL		5	/* 5 secs */
> +#define DEF_DISABLE_QUICK_INTERVAL	1	/* 1 secs */
>  #define DEF_UMOUNT_DISCARD_TIMEOUT	5	/* 5 secs */
>  
>  struct cp_control {
> @@ -1101,6 +1102,7 @@ enum {
>  	SBI_IS_SHUTDOWN,			/* shutdown by ioctl */
>  	SBI_IS_RECOVERED,			/* recovered orphan/data */
>  	SBI_CP_DISABLED,			/* CP was disabled last mount */
> +	SBI_CP_DISABLED_QUICK,			/* CP was disabled quickly */
>  	SBI_QUOTA_NEED_FLUSH,			/* need to flush quota info in CP */
>  	SBI_QUOTA_SKIP_FLUSH,			/* skip flushing quota in current CP */
>  	SBI_QUOTA_NEED_REPAIR,			/* quota file may be corrupted */
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 0d461321edfc..fe6f92fbba38 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -1972,11 +1972,11 @@ static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg)
>  		break;
>  	case F2FS_GOING_DOWN_NEED_FSCK:
>  		set_sbi_flag(sbi, SBI_NEED_FSCK);
> +		set_sbi_flag(sbi, SBI_CP_DISABLED_QUICK);
> +		set_sbi_flag(sbi, SBI_IS_DIRTY);
>  		/* do checkpoint only */
>  		ret = f2fs_sync_fs(sb, 1);
> -		if (ret)
> -			goto out;
> -		break;
> +		goto out;
>  	default:
>  		ret = -EINVAL;
>  		goto out;
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index 5b2b9be6f28d..342b720fb4db 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -868,6 +868,9 @@ int f2fs_disable_cp_again(struct f2fs_sb_info *sbi)
>  
>  	if (holes[DATA] > ovp || holes[NODE] > ovp)
>  		return -EAGAIN;
> +	if (is_sbi_flag_set(sbi, SBI_CP_DISABLED_QUICK) &&
> +		dirty_segments(sbi) > overprovision_segments(sbi))
> +		return -EAGAIN;
>  	return 0;
>  }
>  
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 24efd76ca151..5e1f8573a17f 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -3205,6 +3205,10 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
>  
>  	if (__is_set_ckpt_flags(F2FS_CKPT(sbi), CP_QUOTA_NEED_FSCK_FLAG))
>  		set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
> +	if (__is_set_ckpt_flags(F2FS_CKPT(sbi), CP_DISABLED_QUICK_FLAG)) {
> +		set_sbi_flag(sbi, SBI_CP_DISABLED_QUICK);
> +		sbi->interval_time[DISABLE_TIME] = DEF_DISABLE_QUICK_INTERVAL;
> +	}
>  
>  	/* Initialize device list */
>  	err = f2fs_scan_devices(sbi);
> @@ -3392,6 +3396,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
>  				cur_cp_version(F2FS_CKPT(sbi)));
>  	f2fs_update_time(sbi, CP_TIME);
>  	f2fs_update_time(sbi, REQ_TIME);
> +	clear_sbi_flag(sbi, SBI_CP_DISABLED_QUICK);
>  	return 0;
>  
>  free_meta:
> diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
> index d7711048ef93..d6befe1f9dc7 100644
> --- a/include/linux/f2fs_fs.h
> +++ b/include/linux/f2fs_fs.h
> @@ -116,6 +116,7 @@ struct f2fs_super_block {
>  /*
>   * For checkpoint
>   */
> +#define CP_DISABLED_QUICK_FLAG		0x00002000
>  #define CP_DISABLED_FLAG		0x00001000
>  #define CP_QUOTA_NEED_FSCK_FLAG		0x00000800
>  #define CP_LARGE_NAT_BITMAP_FLAG	0x00000400
>