linux-kernel - Re: [PATCH 6/7] isofs: stop using ioctl_by

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Message-ID: <20200423110347.GE3737@quack2.suse.cz>
Date:   Thu, 23 Apr 2020 13:03:47 +0200
From:   Jan Kara <jack@...e.cz>
To:     Christoph Hellwig <hch@....de>
Cc:     Jens Axboe <axboe@...nel.dk>, Tim Waugh <tim@...erelk.net>,
        Borislav Petkov <bp@...en8.de>, Jan Kara <jack@...e.com>,
        linux-block@...r.kernel.org, linux-ide@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/7] isofs: stop using ioctl_by_bdev

On Thu 23-04-20 09:12:23, Christoph Hellwig wrote:
> Instead just call the CD-ROM layer functionality directly, and turn the
> hot mess in isofs_get_last_session into remotely readable code.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

One comment below...

> ---
>  fs/isofs/inode.c | 54 +++++++++++++++++++++++-------------------------
>  1 file changed, 26 insertions(+), 28 deletions(-)
> 
> diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
> index 62c0462dc89f..fc48923a9b6c 100644
> --- a/fs/isofs/inode.c
> +++ b/fs/isofs/inode.c
> @@ -544,43 +544,41 @@ static int isofs_show_options(struct seq_file *m, struct dentry *root)
>  
>  static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
>  {
> -	struct cdrom_multisession ms_info;
> -	unsigned int vol_desc_start;
> -	struct block_device *bdev = sb->s_bdev;
> -	int i;
> +	struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk);
> +	unsigned int vol_desc_start = 0;
>  
> -	vol_desc_start=0;
> -	ms_info.addr_format=CDROM_LBA;
>  	if (session > 0) {
> -		struct cdrom_tocentry Te;
> -		Te.cdte_track=session;
> -		Te.cdte_format=CDROM_LBA;
> -		i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
> -		if (!i) {
> +		struct cdrom_tocentry te;
> +
> +		if (!cdi)
> +			return -EINVAL;

There's no error handling in the caller and this function actually returns
unsigned int... So I believe you need to return 0 here to maintain previous
behavior (however suspicious it may be)?

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR