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cdrom: factor out a cdrom_read_tocentry helper 

Factor out a version of the CDROMREADTOCENTRY ioctl handler that can
be called directly from kernel space.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-04-25 09:57:02 +02:00 committed by Jens Axboe
parent 068f8d9b4e
commit 4c3cfcce45
2 changed files with 25 additions and 17 deletions
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39
drivers/cdrom/cdrom.c
View File

@ -2666,32 +2666,37 @@ static int cdrom_ioctl_read_tochdr(struct cdrom_device_info *cdi,
return 0;
}
int cdrom_read_tocentry(struct cdrom_device_info *cdi,
struct cdrom_tocentry *entry)
{
u8 requested_format = entry->cdte_format;
int ret;
if (requested_format != CDROM_MSF && requested_format != CDROM_LBA)
return -EINVAL;
/* make interface to low-level uniform */
entry->cdte_format = CDROM_MSF;
ret = cdi->ops->audio_ioctl(cdi, CDROMREADTOCENTRY, entry);
if (!ret)
sanitize_format(&entry->cdte_addr, &entry->cdte_format,
requested_format);
return ret;
}
EXPORT_SYMBOL_GPL(cdrom_read_tocentry);
static int cdrom_ioctl_read_tocentry(struct cdrom_device_info *cdi,
void __user *argp)
{
struct cdrom_tocentry entry;
u8 requested_format;
int ret;
/* cd_dbg(CD_DO_IOCTL, "entering CDROMREADTOCENTRY\n"); */
if (copy_from_user(&entry, argp, sizeof(entry)))
return -EFAULT;
requested_format = entry.cdte_format;
if (requested_format != CDROM_MSF && requested_format != CDROM_LBA)
return -EINVAL;
/* make interface to low-level uniform */
entry.cdte_format = CDROM_MSF;
ret = cdi->ops->audio_ioctl(cdi, CDROMREADTOCENTRY, &entry);
if (ret)
return ret;
sanitize_format(&entry.cdte_addr, &entry.cdte_format, requested_format);
if (copy_to_user(argp, &entry, sizeof(entry)))
ret = cdrom_read_tocentry(cdi, &entry);
if (!ret && copy_to_user(argp, &entry, sizeof(entry)))
return -EFAULT;
/* cd_dbg(CD_DO_IOCTL, "CDROMREADTOCENTRY successful\n"); */
return 0;
return ret;
}
static int cdrom_ioctl_play_msf(struct cdrom_device_info *cdi,

3
include/linux/cdrom.h
View File

@ -94,6 +94,9 @@ struct cdrom_device_ops {
struct packet_command *);
};
int cdrom_read_tocentry(struct cdrom_device_info *cdi,
struct cdrom_tocentry *entry);
/* the general block_device operations structure: */
extern int cdrom_open(struct cdrom_device_info *cdi, struct block_device *bdev,
fmode_t mode);