linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: fix align check for npo2

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Date:   Sat, 1 Apr 2023 09:49:16 +0800
From:   Chao Yu <chao@...nel.org>
To:     Yohan Joung <jyh429@...il.com>, jaegeuk@...nel.org
Cc:     lkp@...el.com, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        oe-kbuild-all@...ts.linux.dev
Subject: Re: [f2fs-dev] [PATCH] f2fs: fix align check for npo2

On 2023/3/24 21:07, Yohan Joung wrote:
> Fix alignment check to be correct in npo2 as well
> 
> Signed-off-by: Yohan Joung <yohan.joung@...com>
> ---
>   fs/f2fs/segment.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index 055e70e77aa2..f4a22a065277 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -1842,6 +1842,7 @@ static int __f2fs_issue_discard_zone(struct f2fs_sb_info *sbi,
>   	sector_t sector, nr_sects;
>   	block_t lblkstart = blkstart;
>   	int devi = 0;
> +	u32 remainder = 0;
>   
>   	if (f2fs_is_multi_device(sbi)) {
>   		devi = f2fs_target_device_index(sbi, blkstart);
> @@ -1857,9 +1858,9 @@ static int __f2fs_issue_discard_zone(struct f2fs_sb_info *sbi,
>   	if (f2fs_blkz_is_seq(sbi, devi, blkstart)) {
>   		sector = SECTOR_FROM_BLOCK(blkstart);
>   		nr_sects = SECTOR_FROM_BLOCK(blklen);
> +		div_u64_rem(sector, bdev_zone_sectors(bdev), &remainder);

Should use div64_u64_rem()? As both sector and return value of bdev_zone_sectors()
are u64.

Thanks,

>   
> -		if (sector & (bdev_zone_sectors(bdev) - 1) ||
> -				nr_sects != bdev_zone_sectors(bdev)) {
> +		if (remainder || nr_sects != bdev_zone_sectors(bdev)) {
>   			f2fs_err(sbi, "(%d) %s: Unaligned zone reset attempted (block %x + %x)",
>   				 devi, sbi->s_ndevs ? FDEV(devi).path : "",
>   				 blkstart, blklen);