linux-kernel - Re: [f2fs-dev] [PATCH 2/2] f2fs: keep io_flags to avoid IO split due to different op

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Message-ID: <Yl88F3RVRMfwyB7+@google.com>
Date:   Tue, 19 Apr 2022 15:47:51 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <chao@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH 2/2] f2fs: keep io_flags to avoid IO split due
 to different op_flags in two fio holders

On 04/17, Chao Yu wrote:
> On 2022/4/13 23:49, Jaegeuk Kim wrote:
> > Let's attach io_flags to bio only, so that we can merge IOs given original
> > io_flags only.
> > 
> > Fixes: 64bf0eef0171 ("f2fs: pass the bio operation to bio_alloc_bioset")
> 
> Nice catch.
> 
> Wasn't this bug introduced by:

I don't think so.

> 
> commit da9953b729c1 ("f2fs: introduce sysfs/data_io_flag to attach REQ_META/FUA")
> 
> static void __attach_data_io_flag(struct f2fs_io_info *fio)
> {
> ...
>        if ((1 << fio->temp) & meta_flag)
>                fio->op_flags |= REQ_META;
>        if ((1 << fio->temp) & fua_flag)
>                fio->op_flags |= REQ_FUA;
> ...
> 
> Thanks,
> 
> > Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> > ---
> >   fs/f2fs/data.c | 33 +++++++++++++++++++++------------
> >   1 file changed, 21 insertions(+), 12 deletions(-)
> > 
> > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> > index acc523f893ba..fcf0daa386de 100644
> > --- a/fs/f2fs/data.c
> > +++ b/fs/f2fs/data.c
> > @@ -387,11 +387,23 @@ int f2fs_target_device_index(struct f2fs_sb_info *sbi, block_t blkaddr)
> >   	return 0;
> >   }
> > -static void __attach_io_flag(struct f2fs_io_info *fio, unsigned int io_flag)
> > +static unsigned int f2fs_io_flags(struct f2fs_io_info *fio)
> >   {
> >   	unsigned int temp_mask = (1 << NR_TEMP_TYPE) - 1;
> > -	unsigned int fua_flag = io_flag & temp_mask;
> > -	unsigned int meta_flag = (io_flag >> NR_TEMP_TYPE) & temp_mask;
> > +	unsigned int fua_flag, meta_flag, io_flag;
> > +	unsigned int op_flags = 0;
> > +
> > +	if (fio->op != REQ_OP_WRITE)
> > +		return 0;
> > +	if (fio->type == DATA)
> > +		io_flag = fio->sbi->data_io_flag;
> > +	else if (fio->type == NODE)
> > +		io_flag = fio->sbi->node_io_flag;
> > +	else
> > +		return 0;
> > +
> > +	fua_flag = io_flag & temp_mask;
> > +	meta_flag = (io_flag >> NR_TEMP_TYPE) & temp_mask;
> >   	/*
> >   	 * data/node io flag bits per temp:
> > @@ -400,9 +412,10 @@ static void __attach_io_flag(struct f2fs_io_info *fio, unsigned int io_flag)
> >   	 * Cold | Warm | Hot | Cold | Warm | Hot |
> >   	 */
> >   	if ((1 << fio->temp) & meta_flag)
> > -		fio->op_flags |= REQ_META;
> > +		op_flags |= REQ_META;
> >   	if ((1 << fio->temp) & fua_flag)
> > -		fio->op_flags |= REQ_FUA;
> > +		op_flags |= REQ_FUA;
> > +	return op_flags;
> >   }
> >   static struct bio *__bio_alloc(struct f2fs_io_info *fio, int npages)
> > @@ -412,14 +425,10 @@ static struct bio *__bio_alloc(struct f2fs_io_info *fio, int npages)
> >   	sector_t sector;
> >   	struct bio *bio;
> > -	if (fio->type == DATA)
> > -		__attach_io_flag(fio, sbi->data_io_flag);
> > -	else if (fio->type == NODE)
> > -		__attach_io_flag(fio, sbi->node_io_flag);
> > -
> >   	bdev = f2fs_target_device(sbi, fio->new_blkaddr, &sector);
> > -	bio = bio_alloc_bioset(bdev, npages, fio->op | fio->op_flags, GFP_NOIO,
> > -			       &f2fs_bioset);
> > +	bio = bio_alloc_bioset(bdev, npages,
> > +				fio->op | fio->op_flags | f2fs_io_flags(fio),
> > +				GFP_NOIO, &f2fs_bioset);
> >   	bio->bi_iter.bi_sector = sector;
> >   	if (is_read_io(fio->op)) {
> >   		bio->bi_end_io = f2fs_read_end_io;