linux-kernel - Re: [PATCH v2 07/14] ntfs3: replace ll_rw

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Message-ID: <20220901154738.6b5gti2w2y2f4see@quack3>
Date:   Thu, 1 Sep 2022 17:47:38 +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 07/14] ntfs3: replace ll_rw_block()

On Thu 01-09-22 21:34:58, Zhang Yi wrote:
> ll_rw_block() is not safe for the sync read path because it cannot
> guarantee that submitting read IO if the buffer has been locked. We
> could get false positive EIO after wait_on_buffer() if the buffer has
> been locked by others. So stop using ll_rw_block() in
> ntfs_get_block_vbo().
> 
> Signed-off-by: Zhang Yi <yi.zhang@...wei.com>

Looks good. Feel free to add:

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

								Honza

> ---
>  fs/ntfs3/inode.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/ntfs3/inode.c b/fs/ntfs3/inode.c
> index 51363d4e8636..cadbfa111539 100644
> --- a/fs/ntfs3/inode.c
> +++ b/fs/ntfs3/inode.c
> @@ -630,12 +630,9 @@ static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
>  			bh->b_size = block_size;
>  			off = vbo & (PAGE_SIZE - 1);
>  			set_bh_page(bh, page, off);
> -			ll_rw_block(REQ_OP_READ, 1, &bh);
> -			wait_on_buffer(bh);
> -			if (!buffer_uptodate(bh)) {
> -				err = -EIO;
> +			err = bh_read(bh, 0);
> +			if (err < 0)
>  				goto out;
> -			}
>  			zero_user_segment(page, off + voff, off + block_size);
>  		}
>  	}
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR