linux-kernel - Re: [PATCH v2 04/14] gfs2: replace ll_rw

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Message-ID: <20220901154644.uxxzwa7gvzlnbw7j@quack3>
Date:   Thu, 1 Sep 2022 17:46:44 +0200
From:   Jan Kara <jack@...e.cz>
To:     Zhang Yi <yi.zhang@...wei.com>
Cc:     linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, cluster-devel@...hat.com,
        ntfs3@...ts.linux.dev, ocfs2-devel@....oracle.com,
        reiserfs-devel@...r.kernel.org, jack@...e.cz, tytso@....edu,
        akpm@...ux-foundation.org, axboe@...nel.dk,
        viro@...iv.linux.org.uk, rpeterso@...hat.com, agruenba@...hat.com,
        almaz.alexandrovich@...agon-software.com, mark@...heh.com,
        dushistov@...l.ru, hch@...radead.org, chengzhihao1@...wei.com,
        yukuai3@...wei.com
Subject: Re: [PATCH v2 04/14] gfs2: replace ll_rw_block()

On Thu 01-09-22 21:34:55, Zhang Yi wrote:
> ll_rw_block() is not safe for the sync read path because it cannot
> guarantee that always submitting read IO if the buffer has been locked,
> so stop using it. We also switch to new bh_readahead() helper for the
> readahead path.
> 
> Signed-off-by: Zhang Yi <yi.zhang@...wei.com>

Looks good to me. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  fs/gfs2/meta_io.c | 7 ++-----
>  fs/gfs2/quota.c   | 8 ++------
>  2 files changed, 4 insertions(+), 11 deletions(-)
> 
> diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
> index 7e70e0ba5a6c..6ed728aae9a5 100644
> --- a/fs/gfs2/meta_io.c
> +++ b/fs/gfs2/meta_io.c
> @@ -525,8 +525,7 @@ struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen)
>  
>  	if (buffer_uptodate(first_bh))
>  		goto out;
> -	if (!buffer_locked(first_bh))
> -		ll_rw_block(REQ_OP_READ | REQ_META | REQ_PRIO, 1, &first_bh);
> +	bh_read_nowait(first_bh, REQ_META | REQ_PRIO);
>  
>  	dblock++;
>  	extlen--;
> @@ -534,9 +533,7 @@ struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen)
>  	while (extlen) {
>  		bh = gfs2_getbuf(gl, dblock, CREATE);
>  
> -		if (!buffer_uptodate(bh) && !buffer_locked(bh))
> -			ll_rw_block(REQ_OP_READ | REQ_RAHEAD | REQ_META |
> -				    REQ_PRIO, 1, &bh);
> +		bh_readahead(bh, REQ_RAHEAD | REQ_META | REQ_PRIO);
>  		brelse(bh);
>  		dblock++;
>  		extlen--;
> diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
> index f201eaf59d0d..1ed17226d9ed 100644
> --- a/fs/gfs2/quota.c
> +++ b/fs/gfs2/quota.c
> @@ -745,12 +745,8 @@ static int gfs2_write_buf_to_page(struct gfs2_inode *ip, unsigned long index,
>  		}
>  		if (PageUptodate(page))
>  			set_buffer_uptodate(bh);
> -		if (!buffer_uptodate(bh)) {
> -			ll_rw_block(REQ_OP_READ | REQ_META | REQ_PRIO, 1, &bh);
> -			wait_on_buffer(bh);
> -			if (!buffer_uptodate(bh))
> -				goto unlock_out;
> -		}
> +		if (bh_read(bh, REQ_META | REQ_PRIO) < 0)
> +			goto unlock_out;
>  		if (gfs2_is_jdata(ip))
>  			gfs2_trans_add_data(ip->i_gl, bh);
>  		else
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR