1 #include <linux/blkdev.h>
2 #include <linux/blkpg.h>
3 #include <linux/blktrace_api.h>
4 #include <linux/cdrom.h>
5 #include <linux/compat.h>
6 #include <linux/elevator.h>
8 #include <linux/hdreg.h>
9 #include <linux/syscalls.h>
10 #include <linux/smp_lock.h>
11 #include <linux/types.h>
12 #include <linux/uaccess.h>
14 static int compat_put_ushort(unsigned long arg, unsigned short val)
16 return put_user(val, (unsigned short __user *)compat_ptr(arg));
19 static int compat_put_int(unsigned long arg, int val)
21 return put_user(val, (compat_int_t __user *)compat_ptr(arg));
24 static int compat_put_long(unsigned long arg, long val)
26 return put_user(val, (compat_long_t __user *)compat_ptr(arg));
29 static int compat_put_ulong(unsigned long arg, compat_ulong_t val)
31 return put_user(val, (compat_ulong_t __user *)compat_ptr(arg));
34 static int compat_put_u64(unsigned long arg, u64 val)
36 return put_user(val, (compat_u64 __user *)compat_ptr(arg));
39 #define BLKBSZGET_32 _IOR(0x12, 112, int)
40 #define BLKBSZSET_32 _IOW(0x12, 113, int)
41 #define BLKGETSIZE64_32 _IOR(0x12, 114, int)
43 static int compat_blkdev_driver_ioctl(struct inode *inode, struct file *file,
44 struct gendisk *disk, unsigned cmd, unsigned long arg)
50 * No handler required for the ones below, we just need to
51 * convert arg to a 64 bit pointer.
55 * 0x03 -- HD/IDE ioctl's used by hdparm and friends.
56 * Some need translations, these do not.
58 case HDIO_GET_IDENTITY:
62 /* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
64 /* 0x02 -- Floppy ioctls */
87 case CDROMREADTOCENTRY:
93 case CDROMMULTISESSION:
100 case CDROM_DISC_STATUS:
101 case CDROM_CHANGER_NSLOTS:
102 case CDROM_GET_CAPABILITY:
103 /* Ignore cdrom.h about these next 5 ioctls, they absolutely do
104 * not take a struct cdrom_read, instead they take a struct cdrom_msf
105 * which is compatible.
110 case CDROMREADCOOKED:
113 case DVD_READ_STRUCT:
114 case DVD_WRITE_STRUCT:
116 arg = (unsigned long)compat_ptr(arg);
117 /* These intepret arg as an unsigned long, not as a pointer,
118 * so we must not do compat_ptr() conversion. */
119 case HDIO_SET_MULTCOUNT:
120 case HDIO_SET_UNMASKINTR:
121 case HDIO_SET_KEEPSETTINGS:
123 case HDIO_SET_NOWERR:
125 case HDIO_SET_PIO_MODE:
127 case HDIO_SET_WCACHE:
128 case HDIO_SET_ACOUSTIC:
129 case HDIO_SET_BUSSTATE:
130 case HDIO_SET_ADDRESS:
132 case CDROM_SET_OPTIONS:
133 case CDROM_CLEAR_OPTIONS:
134 case CDROM_SELECT_SPEED:
135 case CDROM_SELECT_DISC:
136 case CDROM_MEDIA_CHANGED:
137 case CDROM_DRIVE_STATUS:
142 /* unknown ioctl number */
146 if (disk->fops->unlocked_ioctl)
147 return disk->fops->unlocked_ioctl(file, cmd, arg);
149 if (disk->fops->ioctl) {
151 ret = disk->fops->ioctl(inode, file, cmd, arg);
159 static int compat_blkdev_locked_ioctl(struct inode *inode, struct file *file,
160 struct block_device *bdev,
161 unsigned cmd, unsigned long arg)
163 struct backing_dev_info *bdi;
170 bdi = blk_get_backing_dev_info(bdev);
173 return compat_put_long(arg,
174 (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
175 case BLKROGET: /* compatible */
176 return compat_put_int(arg, bdev_read_only(bdev) != 0);
177 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
178 return compat_put_int(arg, block_size(bdev));
179 case BLKSSZGET: /* get block device hardware sector size */
180 return compat_put_int(arg, bdev_hardsect_size(bdev));
182 return compat_put_ushort(arg,
183 bdev_get_queue(bdev)->max_sectors);
184 case BLKRASET: /* compatible, but no compat_ptr (!) */
186 if (!capable(CAP_SYS_ADMIN))
188 bdi = blk_get_backing_dev_info(bdev);
191 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
194 if ((bdev->bd_inode->i_size >> 9) > ~0UL)
196 return compat_put_ulong(arg, bdev->bd_inode->i_size >> 9);
198 case BLKGETSIZE64_32:
199 return compat_put_u64(arg, bdev->bd_inode->i_size);
204 /* Most of the generic ioctls are handled in the normal fallback path.
205 This assumes the blkdev's low level compat_ioctl always returns
206 ENOIOCTLCMD for unknown ioctls. */
207 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
209 int ret = -ENOIOCTLCMD;
210 struct inode *inode = file->f_mapping->host;
211 struct block_device *bdev = inode->i_bdev;
212 struct gendisk *disk = bdev->bd_disk;
218 * the ones below are implemented in blkdev_locked_ioctl,
219 * but we call blkdev_ioctl, which gets the lock for us
222 return blkdev_ioctl(inode, file, cmd,
223 (unsigned long)compat_ptr(arg));
225 return blkdev_ioctl(inode, file, BLKBSZSET,
226 (unsigned long)compat_ptr(arg));
230 ret = compat_blkdev_locked_ioctl(inode, file, bdev, cmd, arg);
231 /* FIXME: why do we assume -> compat_ioctl needs the BKL? */
232 if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
233 ret = disk->fops->compat_ioctl(file, cmd, arg);
236 if (ret != -ENOIOCTLCMD)
239 return compat_blkdev_driver_ioctl(inode, file, disk, cmd, arg);