linux-kernel - Re: [f2fs-dev] [PATCH v2] f2fs: avoid swapon failure by giving a warning first

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Date:   Wed, 12 May 2021 18:13:30 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>, <linux-kernel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>
CC:     kernel test robot <oliver.sang@...el.com>
Subject: Re: [f2fs-dev] [PATCH v2] f2fs: avoid swapon failure by giving a
 warning first

Jaegeuk,

On 2021/5/12 12:00, Jaegeuk Kim wrote:
> The final solution can be migrating blocks to form a section-aligned file
> internally. Meanwhile, let's ask users to do that when preparing the swap
> file initially like:
> 1) create()
> 2) ioctl(F2FS_IOC_SET_PIN_FILE)
> 3) fallocate()
> 
> Reported-by: kernel test robot <oliver.sang@...el.com>
> Fixes: 36e4d95891ed ("f2fs: check if swapfile is section-alligned")
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>

Reviewed-by: Chao Yu <yuchao0@...wei.com>

I've not tested yet though, any comments on below patch?

[PATCH RFC] f2fs: support migrating swapfile in aligned write mode

Thanks,

> ---
> v2:
>   - fix to warn out once
>   - cover check_swap_activate_fast
> 
>   fs/f2fs/data.c | 29 +++++++++++++++++++++++------
>   1 file changed, 23 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 33e56ae84e35..41e260680b27 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -3801,6 +3801,7 @@ static int f2fs_is_file_aligned(struct inode *inode)
>   	block_t pblock;
>   	unsigned long nr_pblocks;
>   	unsigned int blocks_per_sec = BLKS_PER_SEC(sbi);
> +	unsigned int not_aligned = 0;
>   	int ret = 0;
>   
>   	cur_lblock = 0;
> @@ -3833,13 +3834,20 @@ static int f2fs_is_file_aligned(struct inode *inode)
>   
>   		if ((pblock - main_blkaddr) & (blocks_per_sec - 1) ||
>   			nr_pblocks & (blocks_per_sec - 1)) {
> -			f2fs_err(sbi, "Swapfile does not align to section");
> -			ret = -EINVAL;
> -			goto out;
> +			if (f2fs_is_pinned_file(inode)) {
> +				f2fs_err(sbi, "Swapfile does not align to section");
> +				ret = -EINVAL;
> +				goto out;
> +			}
> +			not_aligned++;
>   		}
>   
>   		cur_lblock += nr_pblocks;
>   	}
> +	if (not_aligned)
> +		f2fs_warn(sbi, "Swapfile (%u) is not align to section: \n"
> +			"\t1) creat(), 2) ioctl(F2FS_IOC_SET_PIN_FILE), 3) fallocate()",
> +			not_aligned);
>   out:
>   	return ret;
>   }
> @@ -3858,6 +3866,7 @@ static int check_swap_activate_fast(struct swap_info_struct *sis,
>   	int nr_extents = 0;
>   	unsigned long nr_pblocks;
>   	unsigned int blocks_per_sec = BLKS_PER_SEC(sbi);
> +	unsigned int not_aligned = 0;
>   	int ret = 0;
>   
>   	/*
> @@ -3896,9 +3905,12 @@ static int check_swap_activate_fast(struct swap_info_struct *sis,
>   
>   		if ((pblock - SM_I(sbi)->main_blkaddr) & (blocks_per_sec - 1) ||
>   				nr_pblocks & (blocks_per_sec - 1)) {
> -			f2fs_err(sbi, "Swapfile does not align to section");
> -			ret = -EINVAL;
> -			goto out;
> +			if (f2fs_is_pinned_file(inode)) {
> +				f2fs_err(sbi, "Swapfile does not align to section");
> +				ret = -EINVAL;
> +				goto out;
> +			}
> +			not_aligned++;
>   		}
>   
>   		if (cur_lblock + nr_pblocks >= sis->max)
> @@ -3927,6 +3939,11 @@ static int check_swap_activate_fast(struct swap_info_struct *sis,
>   	sis->max = cur_lblock;
>   	sis->pages = cur_lblock - 1;
>   	sis->highest_bit = cur_lblock - 1;
> +
> +	if (not_aligned)
> +		f2fs_warn(sbi, "Swapfile (%u) is not align to section: \n"
> +			"\t1) creat(), 2) ioctl(F2FS_IOC_SET_PIN_FILE), 3) fallocate()",
> +			not_aligned);
>   out:
>   	return ret;
>   }
>