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>

2 files changed, 120 insertions, 84 deletions

diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c
index d20fdb436f68..500cc9e761c1 100644
--- a/block/compat_ioctl.c
+++ b/block/compat_ioctl.c
@@ -40,6 +40,122 @@ static int compat_put_u64(unsigned long arg, u64 val)
 #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 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
                 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);
 }
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 6be121868c60..16d681c331f9 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -2477,47 +2477,8 @@ COMPATIBLE_IOCTL(FIONREAD)  /* This is also TIOCINQ */
 /* 0x00 */
 COMPATIBLE_IOCTL(FIBMAP)
 COMPATIBLE_IOCTL(FIGETBSZ)
-/* 0x03 -- HD/IDE ioctl's used by hdparm and friends.
- *         Some need translations, these do not.
- */
-COMPATIBLE_IOCTL(HDIO_GET_IDENTITY)
-COMPATIBLE_IOCTL(HDIO_DRIVE_TASK)
-COMPATIBLE_IOCTL(HDIO_DRIVE_CMD)
-ULONG_IOCTL(HDIO_SET_MULTCOUNT)
-ULONG_IOCTL(HDIO_SET_UNMASKINTR)
-ULONG_IOCTL(HDIO_SET_KEEPSETTINGS)
-ULONG_IOCTL(HDIO_SET_32BIT)
-ULONG_IOCTL(HDIO_SET_NOWERR)
-ULONG_IOCTL(HDIO_SET_DMA)
-ULONG_IOCTL(HDIO_SET_PIO_MODE)
-ULONG_IOCTL(HDIO_SET_NICE)
-ULONG_IOCTL(HDIO_SET_WCACHE)
-ULONG_IOCTL(HDIO_SET_ACOUSTIC)
-ULONG_IOCTL(HDIO_SET_BUSSTATE)
-ULONG_IOCTL(HDIO_SET_ADDRESS)
-COMPATIBLE_IOCTL(HDIO_SCAN_HWIF)
-/* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
-COMPATIBLE_IOCTL(0x330)
-/* 0x02 -- Floppy ioctls */
-COMPATIBLE_IOCTL(FDMSGON)
-COMPATIBLE_IOCTL(FDMSGOFF)
-COMPATIBLE_IOCTL(FDSETEMSGTRESH)
-COMPATIBLE_IOCTL(FDFLUSH)
-COMPATIBLE_IOCTL(FDWERRORCLR)
-COMPATIBLE_IOCTL(FDSETMAXERRS)
-COMPATIBLE_IOCTL(FDGETMAXERRS)
-COMPATIBLE_IOCTL(FDGETDRVTYP)
-COMPATIBLE_IOCTL(FDEJECT)
-COMPATIBLE_IOCTL(FDCLRPRM)
-COMPATIBLE_IOCTL(FDFMTBEG)
-COMPATIBLE_IOCTL(FDFMTEND)
-COMPATIBLE_IOCTL(FDRESET)
-COMPATIBLE_IOCTL(FDTWADDLE)
-COMPATIBLE_IOCTL(FDFMTTRK)
-COMPATIBLE_IOCTL(FDRAWCMD)
 /* 0x12 */
 #ifdef CONFIG_BLOCK
-COMPATIBLE_IOCTL(BLKSECTSET)
 COMPATIBLE_IOCTL(BLKTRACESTART)
 COMPATIBLE_IOCTL(BLKTRACESTOP)
 COMPATIBLE_IOCTL(BLKTRACESETUP)
@@ -2770,50 +2731,6 @@ COMPATIBLE_IOCTL(PPGETMODE)
 COMPATIBLE_IOCTL(PPGETPHASE)
 COMPATIBLE_IOCTL(PPGETFLAGS)
 COMPATIBLE_IOCTL(PPSETFLAGS)
-/* CDROM stuff */
-COMPATIBLE_IOCTL(CDROMPAUSE)
-COMPATIBLE_IOCTL(CDROMRESUME)
-COMPATIBLE_IOCTL(CDROMPLAYMSF)
-COMPATIBLE_IOCTL(CDROMPLAYTRKIND)
-COMPATIBLE_IOCTL(CDROMREADTOCHDR)
-COMPATIBLE_IOCTL(CDROMREADTOCENTRY)
-COMPATIBLE_IOCTL(CDROMSTOP)
-COMPATIBLE_IOCTL(CDROMSTART)
-COMPATIBLE_IOCTL(CDROMEJECT)
-COMPATIBLE_IOCTL(CDROMVOLCTRL)
-COMPATIBLE_IOCTL(CDROMSUBCHNL)
-ULONG_IOCTL(CDROMEJECT_SW)
-COMPATIBLE_IOCTL(CDROMMULTISESSION)
-COMPATIBLE_IOCTL(CDROM_GET_MCN)
-COMPATIBLE_IOCTL(CDROMRESET)
-COMPATIBLE_IOCTL(CDROMVOLREAD)
-COMPATIBLE_IOCTL(CDROMSEEK)
-COMPATIBLE_IOCTL(CDROMPLAYBLK)
-COMPATIBLE_IOCTL(CDROMCLOSETRAY)
-ULONG_IOCTL(CDROM_SET_OPTIONS)
-ULONG_IOCTL(CDROM_CLEAR_OPTIONS)
-ULONG_IOCTL(CDROM_SELECT_SPEED)
-ULONG_IOCTL(CDROM_SELECT_DISC)
-ULONG_IOCTL(CDROM_MEDIA_CHANGED)
-ULONG_IOCTL(CDROM_DRIVE_STATUS)
-COMPATIBLE_IOCTL(CDROM_DISC_STATUS)
-COMPATIBLE_IOCTL(CDROM_CHANGER_NSLOTS)
-ULONG_IOCTL(CDROM_LOCKDOOR)
-ULONG_IOCTL(CDROM_DEBUG)
-COMPATIBLE_IOCTL(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.
- */
-COMPATIBLE_IOCTL(CDROMREADMODE2)
-COMPATIBLE_IOCTL(CDROMREADMODE1)
-COMPATIBLE_IOCTL(CDROMREADRAW)
-COMPATIBLE_IOCTL(CDROMREADCOOKED)
-COMPATIBLE_IOCTL(CDROMREADALL)
-/* DVD ioctls */
-COMPATIBLE_IOCTL(DVD_READ_STRUCT)
-COMPATIBLE_IOCTL(DVD_WRITE_STRUCT)
-COMPATIBLE_IOCTL(DVD_AUTH)
 /* pktcdvd */
 COMPATIBLE_IOCTL(PACKET_CTRL_CMD)
 /* Big A */