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

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Message-ID: <Zi_b6alGIb2wAkb5@google.com>
Date: Mon, 29 Apr 2024 17:42:01 +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 04/29, Jaegeuk Kim wrote:
> 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.

Ok, I took v2 instead of this.

> 
> --- 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