linux-ext4 - Re: [PATCH 05/14] isofs: replace ll_rw

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Message-ID: <20220831105309.hbsyydkusk2w5hob@quack3>
Date:   Wed, 31 Aug 2022 12:53:09 +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 05/14] isofs: replace ll_rw_block()

On Wed 31-08-22 15:21:02, 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 return from zisofs_uncompress_block() if
> he buffer has been locked by others. So stop using ll_rw_block(),
> switch to sync helper instead.
> 
> 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/isofs/compress.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/isofs/compress.c b/fs/isofs/compress.c
> index b466172eec25..ac35eddff29c 100644
> --- a/fs/isofs/compress.c
> +++ b/fs/isofs/compress.c
> @@ -82,7 +82,7 @@ static loff_t zisofs_uncompress_block(struct inode *inode, loff_t block_start,
>  		return 0;
>  	}
>  	haveblocks = isofs_get_blocks(inode, blocknum, bhs, needblocks);
> -	ll_rw_block(REQ_OP_READ, haveblocks, bhs);
> +	bh_read_batch(bhs, haveblocks);
>  
>  	curbh = 0;
>  	curpage = 0;
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR