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

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Date:   Thu, 23 Apr 2020 07:42:52 +0000
From:   Damien Le Moal <Damien.LeMoal@....com>
To:     Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>
CC:     Tim Waugh <tim@...erelk.net>, Borislav Petkov <bp@...en8.de>,
        Jan Kara <jack@...e.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/7] isofs: stop using ioctl_by_bdev

On 2020/04/23 16:16, 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>
> ---
>  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;
> +
> +		te.cdte_track = session;
> +		te.cdte_format = CDROM_LBA;
> +		if (cdrom_read_tocentry(cdi, &te) == 0) {
>  			printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
> -				session, Te.cdte_addr.lba,
> -				Te.cdte_ctrl&CDROM_DATA_TRACK);
> -			if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
> -				return Te.cdte_addr.lba;
> +				session, te.cdte_addr.lba,
> +				te.cdte_ctrl & CDROM_DATA_TRACK);
> +			if ((te.cdte_ctrl & CDROM_DATA_TRACK) == 4)
> +				return te.cdte_addr.lba;
>  		}
>  
>  		printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
>  	}
> -	i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
> -	if (session > 0)
> -		printk(KERN_ERR "ISOFS: Invalid session number\n");
> -#if 0
> -	printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
> -	if (i==0) {
> -		printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
> -		printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
> -	}
> -#endif
> -	if (i==0)
> +
> +	if (cdi) {
> +		struct cdrom_multisession ms_info;
> +
> +		ms_info.addr_format = CDROM_LBA;
> +		if (cdrom_multisession(cdi, &ms_info) == 0) {
>  #if WE_OBEY_THE_WRITTEN_STANDARDS
> -		if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
> +			/* necessary for a valid ms_info.addr */
> +			if (ms_info.xa_flag)
>  #endif
> -			vol_desc_start=ms_info.addr.lba;
> +				vol_desc_start = ms_info.addr.lba;
> +		}
> +	}
> +
>  	return vol_desc_start;
>  }
>  
> 

Looks OK to me.

Reviewed-by: Damien Le Moal <damien.lemoal@....com>

-- 
Damien Le Moal
Western Digital Research