linux-kernel - Re: [PATCH] f2fs: fix block migration when section is not aligned to pow2

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Message-ID: <Zi_a0wEZpCNW8jHL@google.com>
Date: Mon, 29 Apr 2024 17:37:23 +0000
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Wu Bo <bo.wu@...o.com>
Cc: Chao Yu <chao@...nel.org>, linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, Wu Bo <wubo.oduw@...il.com>,
	Liao Yuanhong <liaoyuanhong@...o.com>
Subject: Re: [PATCH] f2fs: fix block migration when section is not aligned to
 pow2

On 04/26, Wu Bo wrote:
> As for zoned-UFS, f2fs section size is forced to zone size. And zone
> size may not aligned to pow2.
> 
> Fixes: 859fca6b706e ("f2fs: swap: support migrating swapfile in aligned write mode")
> Signed-off-by: Liao Yuanhong <liaoyuanhong@...o.com>
> Signed-off-by: Wu Bo <bo.wu@...o.com>
> ---
>  fs/f2fs/data.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index d9494b5fc7c1..7ff5ad3fd5dc 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -3904,7 +3904,6 @@ static int check_swap_activate(struct swap_info_struct *sis,
>  	int nr_extents = 0;
>  	unsigned long nr_pblocks;
>  	unsigned int blks_per_sec = BLKS_PER_SEC(sbi);
> -	unsigned int sec_blks_mask = BLKS_PER_SEC(sbi) - 1;
>  	unsigned int not_aligned = 0;
>  	int ret = 0;
>  
> @@ -3942,8 +3941,8 @@ static int check_swap_activate(struct swap_info_struct *sis,
>  		pblock = map.m_pblk;
>  		nr_pblocks = map.m_len;
>  
> -		if ((pblock - SM_I(sbi)->main_blkaddr) & sec_blks_mask ||
> -				nr_pblocks & sec_blks_mask ||
> +		if ((pblock - SM_I(sbi)->main_blkaddr) % blks_per_sec ||
> +				nr_pblocks % blks_per_sec ||

Modified a bit to address udiv issue like below. Let's see.

--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -3923,8 +3923,8 @@ static int check_swap_activate(struct swap_info_struct *sis,
        sector_t highest_pblock = 0;
        int nr_extents = 0;
        unsigned long nr_pblocks;
+       u32 align;
        unsigned int blks_per_sec = BLKS_PER_SEC(sbi);
-       unsigned int sec_blks_mask = BLKS_PER_SEC(sbi) - 1;
        unsigned int not_aligned = 0;
        int ret = 0;

@@ -3961,10 +3961,10 @@ static int check_swap_activate(struct swap_info_struct *sis,

                pblock = map.m_pblk;
                nr_pblocks = map.m_len;
+               div_u64_rem(nr_pblocks, blks_per_sec, &align);

-               if ((pblock - SM_I(sbi)->main_blkaddr) & sec_blks_mask ||
-                               nr_pblocks & sec_blks_mask ||
-                               !f2fs_valid_pinned_area(sbi, pblock)) {
+               if ((pblock - SM_I(sbi)->main_blkaddr) % blks_per_sec ||
+                               align || !f2fs_valid_pinned_area(sbi, pblock)) {
                        bool last_extent = false;

                        not_aligned++;

>  				!f2fs_valid_pinned_area(sbi, pblock)) {
>  			bool last_extent = false;
>  
> -- 
> 2.25.1