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

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Message-ID: <004e01d96511$a65359b0$f2fa0d10$@gmail.com>
Date:   Sun, 2 Apr 2023 12:17:23 +0900
From:   "Yohan Joung" <jyh429@...il.com>
To:     "'Chao Yu'" <chao@...nel.org>, <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

> -----Original Message-----
> From: Chao Yu [mailto:chao@...nel.org]
> Sent: Saturday, April 1, 2023 10:49 AM
> To: Yohan Joung; 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,
Upload based on your comments.
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);