compat_ioctl: add compat_blkdev_driver_ioctl()
Handle those blockdev ioctl calls that are compatible
directly from the compat_blkdev_ioctl() function, instead
of having to go through the compat_ioctl hash lookup.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c
index d20fdb4..500cc9e 100644
--- a/block/compat_ioctl.c
+++ b/block/compat_ioctl.c
@@ -40,6 +40,122 @@
#define BLKBSZSET_32 _IOW(0x12, 113, int)
#define BLKGETSIZE64_32 _IOR(0x12, 114, int)
+static int compat_blkdev_driver_ioctl(struct inode *inode, struct file *file,
+ struct gendisk *disk, unsigned cmd, unsigned long arg)
+{
+ int ret;
+
+ switch (arg) {
+ /*
+ * No handler required for the ones below, we just need to
+ * convert arg to a 64 bit pointer.
+ */
+ case BLKSECTSET:
+ /*
+ * 0x03 -- HD/IDE ioctl's used by hdparm and friends.
+ * Some need translations, these do not.
+ */
+ case HDIO_GET_IDENTITY:
+ case HDIO_DRIVE_TASK:
+ case HDIO_DRIVE_CMD:
+ case HDIO_SCAN_HWIF:
+ /* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
+ case 0x330:
+ /* 0x02 -- Floppy ioctls */
+ case FDMSGON:
+ case FDMSGOFF:
+ case FDSETEMSGTRESH:
+ case FDFLUSH:
+ case FDWERRORCLR:
+ case FDSETMAXERRS:
+ case FDGETMAXERRS:
+ case FDGETDRVTYP:
+ case FDEJECT:
+ case FDCLRPRM:
+ case FDFMTBEG:
+ case FDFMTEND:
+ case FDRESET:
+ case FDTWADDLE:
+ case FDFMTTRK:
+ case FDRAWCMD:
+ /* CDROM stuff */
+ case CDROMPAUSE:
+ case CDROMRESUME:
+ case CDROMPLAYMSF:
+ case CDROMPLAYTRKIND:
+ case CDROMREADTOCHDR:
+ case CDROMREADTOCENTRY:
+ case CDROMSTOP:
+ case CDROMSTART:
+ case CDROMEJECT:
+ case CDROMVOLCTRL:
+ case CDROMSUBCHNL:
+ case CDROMMULTISESSION:
+ case CDROM_GET_MCN:
+ case CDROMRESET:
+ case CDROMVOLREAD:
+ case CDROMSEEK:
+ case CDROMPLAYBLK:
+ case CDROMCLOSETRAY:
+ case CDROM_DISC_STATUS:
+ case CDROM_CHANGER_NSLOTS:
+ case CDROM_GET_CAPABILITY:
+ /* Ignore cdrom.h about these next 5 ioctls, they absolutely do
+ * not take a struct cdrom_read, instead they take a struct cdrom_msf
+ * which is compatible.
+ */
+ case CDROMREADMODE2:
+ case CDROMREADMODE1:
+ case CDROMREADRAW:
+ case CDROMREADCOOKED:
+ case CDROMREADALL:
+ /* DVD ioctls */
+ case DVD_READ_STRUCT:
+ case DVD_WRITE_STRUCT:
+ case DVD_AUTH:
+ arg = (unsigned long)compat_ptr(arg);
+ /* These intepret arg as an unsigned long, not as a pointer,
+ * so we must not do compat_ptr() conversion. */
+ case HDIO_SET_MULTCOUNT:
+ case HDIO_SET_UNMASKINTR:
+ case HDIO_SET_KEEPSETTINGS:
+ case HDIO_SET_32BIT:
+ case HDIO_SET_NOWERR:
+ case HDIO_SET_DMA:
+ case HDIO_SET_PIO_MODE:
+ case HDIO_SET_NICE:
+ case HDIO_SET_WCACHE:
+ case HDIO_SET_ACOUSTIC:
+ case HDIO_SET_BUSSTATE:
+ case HDIO_SET_ADDRESS:
+ case CDROMEJECT_SW:
+ case CDROM_SET_OPTIONS:
+ case CDROM_CLEAR_OPTIONS:
+ case CDROM_SELECT_SPEED:
+ case CDROM_SELECT_DISC:
+ case CDROM_MEDIA_CHANGED:
+ case CDROM_DRIVE_STATUS:
+ case CDROM_LOCKDOOR:
+ case CDROM_DEBUG:
+ break;
+ default:
+ /* unknown ioctl number */
+ return -ENOIOCTLCMD;
+ }
+
+ if (disk->fops->unlocked_ioctl)
+ return disk->fops->unlocked_ioctl(file, cmd, arg);
+
+ if (disk->fops->ioctl) {
+ lock_kernel();
+ ret = disk->fops->ioctl(inode, file, cmd, arg);
+ unlock_kernel();
+ return ret;
+ }
+
+ return -ENOTTY;
+}
+
static int compat_blkdev_locked_ioctl(struct inode *inode, struct file *file,
struct block_device *bdev,
unsigned cmd, unsigned long arg)
@@ -117,5 +233,8 @@
ret = disk->fops->compat_ioctl(file, cmd, arg);
unlock_kernel();
- return ret;
+ if (ret != -ENOIOCTLCMD)
+ return ret;
+
+ return compat_blkdev_driver_ioctl(inode, file, disk, cmd, arg);
}