From: Damien Le Moal <Damien.LeMoal@wdc.com>
To: Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>
Cc: Tim Waugh <tim@cyberelk.net>, Borislav Petkov <bp@alien8.de>,
Jan Kara <jack@suse.com>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"linux-ide@vger.kernel.org" <linux-ide@vger.kernel.org>,
"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 4/7] cdrom: factor out a cdrom_multisession helper
Date: Thu, 23 Apr 2020 07:41:39 +0000 [thread overview]
Message-ID: <BY5PR04MB6900C398609A0F6453134767E7D30@BY5PR04MB6900.namprd04.prod.outlook.com> (raw)
In-Reply-To: 20200423071224.500849-5-hch@lst.de
On 2020/04/23 16:15, Christoph Hellwig wrote:
> Factor out a version of the CDROMMULTISESSION: ioctl handler that can
> be called directly from kernel space.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
> drivers/cdrom/cdrom.c | 41 +++++++++++++++++++++++++----------------
> include/linux/cdrom.h | 2 ++
> 2 files changed, 27 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
> index c91d1e138214..06896c07b133 100644
> --- a/drivers/cdrom/cdrom.c
> +++ b/drivers/cdrom/cdrom.c
> @@ -2295,37 +2295,46 @@ static int cdrom_read_cdda(struct cdrom_device_info *cdi, __u8 __user *ubuf,
> return cdrom_read_cdda_old(cdi, ubuf, lba, nframes);
> }
>
> -static int cdrom_ioctl_multisession(struct cdrom_device_info *cdi,
> - void __user *argp)
> +int cdrom_multisession(struct cdrom_device_info *cdi,
> + struct cdrom_multisession *info)
> {
> - struct cdrom_multisession ms_info;
> u8 requested_format;
> int ret;
>
> - cd_dbg(CD_DO_IOCTL, "entering CDROMMULTISESSION\n");
> -
> if (!(cdi->ops->capability & CDC_MULTI_SESSION))
> return -ENOSYS;
>
> - if (copy_from_user(&ms_info, argp, sizeof(ms_info)))
> - return -EFAULT;
> -
> - requested_format = ms_info.addr_format;
> + requested_format = info->addr_format;
> if (requested_format != CDROM_MSF && requested_format != CDROM_LBA)
> return -EINVAL;
> - ms_info.addr_format = CDROM_LBA;
> + info->addr_format = CDROM_LBA;
>
> - ret = cdi->ops->get_last_session(cdi, &ms_info);
> - if (ret)
> - return ret;
> + ret = cdi->ops->get_last_session(cdi, info);
> + if (!ret)
> + sanitize_format(&info->addr, &info->addr_format,
> + requested_format);
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(cdrom_multisession);
>
> - sanitize_format(&ms_info.addr, &ms_info.addr_format, requested_format);
> +static int cdrom_ioctl_multisession(struct cdrom_device_info *cdi,
> + void __user *argp)
> +{
> + struct cdrom_multisession info;
> + int ret;
> +
> + cd_dbg(CD_DO_IOCTL, "entering CDROMMULTISESSION\n");
>
> - if (copy_to_user(argp, &ms_info, sizeof(ms_info)))
> + if (copy_from_user(&info, argp, sizeof(info)))
> + return -EFAULT;
> + ret = cdrom_multisession(cdi, &info);
> + if (ret)
> + return ret;
> + if (copy_to_user(argp, &info, sizeof(info)))
> return -EFAULT;
>
> cd_dbg(CD_DO_IOCTL, "CDROMMULTISESSION successful\n");
> - return 0;
> + return ret;
> }
>
> static int cdrom_ioctl_eject(struct cdrom_device_info *cdi)
> diff --git a/include/linux/cdrom.h b/include/linux/cdrom.h
> index 008c4d79fa33..8543fa59da72 100644
> --- a/include/linux/cdrom.h
> +++ b/include/linux/cdrom.h
> @@ -94,6 +94,8 @@ struct cdrom_device_ops {
> struct packet_command *);
> };
>
> +int cdrom_multisession(struct cdrom_device_info *cdi,
> + struct cdrom_multisession *info);
> int cdrom_read_tocentry(struct cdrom_device_info *cdi,
> struct cdrom_tocentry *entry);
>
>
Looks OK to me.
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
--
Damien Le Moal
Western Digital Research
next prev parent reply other threads:[~2020-04-23 7:41 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-23 7:12 stop using ioctl_by_bdev for file system access to CDROMs Christoph Hellwig
2020-04-23 7:12 ` [PATCH 1/7] block: add a cdrom_device_info pointer to struct gendisk Christoph Hellwig
2020-04-23 7:40 ` Damien Le Moal
2020-04-23 7:12 ` [PATCH 2/7] ide-cd: rename cdrom_read_tocentry Christoph Hellwig
2020-04-23 7:41 ` Damien Le Moal
2020-04-23 7:12 ` [PATCH 3/7] cdrom: factor out a cdrom_read_tocentry helper Christoph Hellwig
2020-04-23 7:41 ` Damien Le Moal
2020-04-23 7:12 ` [PATCH 4/7] cdrom: factor out a cdrom_multisession helper Christoph Hellwig
2020-04-23 7:41 ` Damien Le Moal [this message]
2020-04-23 7:12 ` [PATCH 5/7] hfsplus: stop using ioctl_by_bdev Christoph Hellwig
2020-04-23 7:42 ` Damien Le Moal
2020-04-23 7:12 ` [PATCH 6/7] isofs: " Christoph Hellwig
2020-04-23 7:42 ` Damien Le Moal
2020-04-23 11:03 ` Jan Kara
2020-04-24 6:52 ` Christoph Hellwig
2020-04-24 9:21 ` Jan Kara
2020-04-23 7:12 ` [PATCH 7/7] udf: " Christoph Hellwig
2020-04-23 7:43 ` Damien Le Moal
2020-04-23 11:05 ` Jan Kara
2020-04-25 7:56 stop using ioctl_by_bdev for file system access to CDROMs v2 Christoph Hellwig
2020-04-25 7:57 ` [PATCH 4/7] cdrom: factor out a cdrom_multisession helper Christoph Hellwig
2020-04-27 6:17 ` Hannes Reinecke
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