Arnd Bergmann | f58c4c0 | 2007-10-09 13:23:51 +0200 | [diff] [blame] | 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> |
| 7 | #include <linux/fd.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> |
| 13 | |
| 14 | static int compat_put_ushort(unsigned long arg, unsigned short val) |
| 15 | { |
| 16 | return put_user(val, (unsigned short __user *)compat_ptr(arg)); |
| 17 | } |
| 18 | |
| 19 | static int compat_put_int(unsigned long arg, int val) |
| 20 | { |
| 21 | return put_user(val, (compat_int_t __user *)compat_ptr(arg)); |
| 22 | } |
| 23 | |
| 24 | static int compat_put_long(unsigned long arg, long val) |
| 25 | { |
| 26 | return put_user(val, (compat_long_t __user *)compat_ptr(arg)); |
| 27 | } |
| 28 | |
| 29 | static int compat_put_ulong(unsigned long arg, compat_ulong_t val) |
| 30 | { |
| 31 | return put_user(val, (compat_ulong_t __user *)compat_ptr(arg)); |
| 32 | } |
| 33 | |
| 34 | static int compat_put_u64(unsigned long arg, u64 val) |
| 35 | { |
| 36 | return put_user(val, (compat_u64 __user *)compat_ptr(arg)); |
| 37 | } |
| 38 | |
| 39 | #define BLKBSZGET_32 _IOR(0x12, 112, int) |
| 40 | #define BLKBSZSET_32 _IOW(0x12, 113, int) |
| 41 | #define BLKGETSIZE64_32 _IOR(0x12, 114, int) |
| 42 | |
Arnd Bergmann | 171044d4 | 2007-10-09 13:23:53 +0200 | [diff] [blame^] | 43 | struct compat_blk_user_trace_setup { |
| 44 | char name[32]; |
| 45 | u16 act_mask; |
| 46 | u32 buf_size; |
| 47 | u32 buf_nr; |
| 48 | compat_u64 start_lba; |
| 49 | compat_u64 end_lba; |
| 50 | u32 pid; |
| 51 | }; |
| 52 | #define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup) |
| 53 | |
| 54 | static int compat_blk_trace_setup(struct block_device *bdev, char __user *arg) |
| 55 | { |
| 56 | struct blk_user_trace_setup buts; |
| 57 | struct compat_blk_user_trace_setup cbuts; |
| 58 | struct request_queue *q; |
| 59 | int ret; |
| 60 | |
| 61 | q = bdev_get_queue(bdev); |
| 62 | if (!q) |
| 63 | return -ENXIO; |
| 64 | |
| 65 | if (copy_from_user(&cbuts, arg, sizeof(cbuts))) |
| 66 | return -EFAULT; |
| 67 | |
| 68 | buts = (struct blk_user_trace_setup) { |
| 69 | .act_mask = cbuts.act_mask, |
| 70 | .buf_size = cbuts.buf_size, |
| 71 | .buf_nr = cbuts.buf_nr, |
| 72 | .start_lba = cbuts.start_lba, |
| 73 | .end_lba = cbuts.end_lba, |
| 74 | .pid = cbuts.pid, |
| 75 | }; |
| 76 | memcpy(&buts.name, &cbuts.name, 32); |
| 77 | |
| 78 | mutex_lock(&bdev->bd_mutex); |
| 79 | ret = do_blk_trace_setup(q, bdev, &buts); |
| 80 | mutex_unlock(&bdev->bd_mutex); |
| 81 | if (ret) |
| 82 | return ret; |
| 83 | |
| 84 | if (copy_to_user(arg, &buts.name, 32)) |
| 85 | return -EFAULT; |
| 86 | |
| 87 | return 0; |
| 88 | } |
| 89 | |
Arnd Bergmann | 7199d4c | 2007-10-09 13:23:52 +0200 | [diff] [blame] | 90 | static int compat_blkdev_driver_ioctl(struct inode *inode, struct file *file, |
| 91 | struct gendisk *disk, unsigned cmd, unsigned long arg) |
| 92 | { |
| 93 | int ret; |
| 94 | |
| 95 | switch (arg) { |
| 96 | /* |
| 97 | * No handler required for the ones below, we just need to |
| 98 | * convert arg to a 64 bit pointer. |
| 99 | */ |
| 100 | case BLKSECTSET: |
| 101 | /* |
| 102 | * 0x03 -- HD/IDE ioctl's used by hdparm and friends. |
| 103 | * Some need translations, these do not. |
| 104 | */ |
| 105 | case HDIO_GET_IDENTITY: |
| 106 | case HDIO_DRIVE_TASK: |
| 107 | case HDIO_DRIVE_CMD: |
| 108 | case HDIO_SCAN_HWIF: |
| 109 | /* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */ |
| 110 | case 0x330: |
| 111 | /* 0x02 -- Floppy ioctls */ |
| 112 | case FDMSGON: |
| 113 | case FDMSGOFF: |
| 114 | case FDSETEMSGTRESH: |
| 115 | case FDFLUSH: |
| 116 | case FDWERRORCLR: |
| 117 | case FDSETMAXERRS: |
| 118 | case FDGETMAXERRS: |
| 119 | case FDGETDRVTYP: |
| 120 | case FDEJECT: |
| 121 | case FDCLRPRM: |
| 122 | case FDFMTBEG: |
| 123 | case FDFMTEND: |
| 124 | case FDRESET: |
| 125 | case FDTWADDLE: |
| 126 | case FDFMTTRK: |
| 127 | case FDRAWCMD: |
| 128 | /* CDROM stuff */ |
| 129 | case CDROMPAUSE: |
| 130 | case CDROMRESUME: |
| 131 | case CDROMPLAYMSF: |
| 132 | case CDROMPLAYTRKIND: |
| 133 | case CDROMREADTOCHDR: |
| 134 | case CDROMREADTOCENTRY: |
| 135 | case CDROMSTOP: |
| 136 | case CDROMSTART: |
| 137 | case CDROMEJECT: |
| 138 | case CDROMVOLCTRL: |
| 139 | case CDROMSUBCHNL: |
| 140 | case CDROMMULTISESSION: |
| 141 | case CDROM_GET_MCN: |
| 142 | case CDROMRESET: |
| 143 | case CDROMVOLREAD: |
| 144 | case CDROMSEEK: |
| 145 | case CDROMPLAYBLK: |
| 146 | case CDROMCLOSETRAY: |
| 147 | case CDROM_DISC_STATUS: |
| 148 | case CDROM_CHANGER_NSLOTS: |
| 149 | case CDROM_GET_CAPABILITY: |
| 150 | /* Ignore cdrom.h about these next 5 ioctls, they absolutely do |
| 151 | * not take a struct cdrom_read, instead they take a struct cdrom_msf |
| 152 | * which is compatible. |
| 153 | */ |
| 154 | case CDROMREADMODE2: |
| 155 | case CDROMREADMODE1: |
| 156 | case CDROMREADRAW: |
| 157 | case CDROMREADCOOKED: |
| 158 | case CDROMREADALL: |
| 159 | /* DVD ioctls */ |
| 160 | case DVD_READ_STRUCT: |
| 161 | case DVD_WRITE_STRUCT: |
| 162 | case DVD_AUTH: |
| 163 | arg = (unsigned long)compat_ptr(arg); |
| 164 | /* These intepret arg as an unsigned long, not as a pointer, |
| 165 | * so we must not do compat_ptr() conversion. */ |
| 166 | case HDIO_SET_MULTCOUNT: |
| 167 | case HDIO_SET_UNMASKINTR: |
| 168 | case HDIO_SET_KEEPSETTINGS: |
| 169 | case HDIO_SET_32BIT: |
| 170 | case HDIO_SET_NOWERR: |
| 171 | case HDIO_SET_DMA: |
| 172 | case HDIO_SET_PIO_MODE: |
| 173 | case HDIO_SET_NICE: |
| 174 | case HDIO_SET_WCACHE: |
| 175 | case HDIO_SET_ACOUSTIC: |
| 176 | case HDIO_SET_BUSSTATE: |
| 177 | case HDIO_SET_ADDRESS: |
| 178 | case CDROMEJECT_SW: |
| 179 | case CDROM_SET_OPTIONS: |
| 180 | case CDROM_CLEAR_OPTIONS: |
| 181 | case CDROM_SELECT_SPEED: |
| 182 | case CDROM_SELECT_DISC: |
| 183 | case CDROM_MEDIA_CHANGED: |
| 184 | case CDROM_DRIVE_STATUS: |
| 185 | case CDROM_LOCKDOOR: |
| 186 | case CDROM_DEBUG: |
| 187 | break; |
| 188 | default: |
| 189 | /* unknown ioctl number */ |
| 190 | return -ENOIOCTLCMD; |
| 191 | } |
| 192 | |
| 193 | if (disk->fops->unlocked_ioctl) |
| 194 | return disk->fops->unlocked_ioctl(file, cmd, arg); |
| 195 | |
| 196 | if (disk->fops->ioctl) { |
| 197 | lock_kernel(); |
| 198 | ret = disk->fops->ioctl(inode, file, cmd, arg); |
| 199 | unlock_kernel(); |
| 200 | return ret; |
| 201 | } |
| 202 | |
| 203 | return -ENOTTY; |
| 204 | } |
| 205 | |
Arnd Bergmann | f58c4c0 | 2007-10-09 13:23:51 +0200 | [diff] [blame] | 206 | static int compat_blkdev_locked_ioctl(struct inode *inode, struct file *file, |
| 207 | struct block_device *bdev, |
| 208 | unsigned cmd, unsigned long arg) |
| 209 | { |
| 210 | struct backing_dev_info *bdi; |
| 211 | |
| 212 | switch (cmd) { |
| 213 | case BLKRAGET: |
| 214 | case BLKFRAGET: |
| 215 | if (!arg) |
| 216 | return -EINVAL; |
| 217 | bdi = blk_get_backing_dev_info(bdev); |
| 218 | if (bdi == NULL) |
| 219 | return -ENOTTY; |
| 220 | return compat_put_long(arg, |
| 221 | (bdi->ra_pages * PAGE_CACHE_SIZE) / 512); |
| 222 | case BLKROGET: /* compatible */ |
| 223 | return compat_put_int(arg, bdev_read_only(bdev) != 0); |
| 224 | case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */ |
| 225 | return compat_put_int(arg, block_size(bdev)); |
| 226 | case BLKSSZGET: /* get block device hardware sector size */ |
| 227 | return compat_put_int(arg, bdev_hardsect_size(bdev)); |
| 228 | case BLKSECTGET: |
| 229 | return compat_put_ushort(arg, |
| 230 | bdev_get_queue(bdev)->max_sectors); |
| 231 | case BLKRASET: /* compatible, but no compat_ptr (!) */ |
| 232 | case BLKFRASET: |
| 233 | if (!capable(CAP_SYS_ADMIN)) |
| 234 | return -EACCES; |
| 235 | bdi = blk_get_backing_dev_info(bdev); |
| 236 | if (bdi == NULL) |
| 237 | return -ENOTTY; |
| 238 | bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE; |
| 239 | return 0; |
| 240 | case BLKGETSIZE: |
| 241 | if ((bdev->bd_inode->i_size >> 9) > ~0UL) |
| 242 | return -EFBIG; |
| 243 | return compat_put_ulong(arg, bdev->bd_inode->i_size >> 9); |
| 244 | |
| 245 | case BLKGETSIZE64_32: |
| 246 | return compat_put_u64(arg, bdev->bd_inode->i_size); |
Arnd Bergmann | 171044d4 | 2007-10-09 13:23:53 +0200 | [diff] [blame^] | 247 | |
| 248 | case BLKTRACESETUP32: |
| 249 | return compat_blk_trace_setup(bdev, compat_ptr(arg)); |
| 250 | case BLKTRACESTART: /* compatible */ |
| 251 | case BLKTRACESTOP: /* compatible */ |
| 252 | case BLKTRACETEARDOWN: /* compatible */ |
| 253 | return blk_trace_ioctl(bdev, cmd, compat_ptr(arg)); |
Arnd Bergmann | f58c4c0 | 2007-10-09 13:23:51 +0200 | [diff] [blame] | 254 | } |
| 255 | return -ENOIOCTLCMD; |
| 256 | } |
| 257 | |
| 258 | /* Most of the generic ioctls are handled in the normal fallback path. |
| 259 | This assumes the blkdev's low level compat_ioctl always returns |
| 260 | ENOIOCTLCMD for unknown ioctls. */ |
| 261 | long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
| 262 | { |
| 263 | int ret = -ENOIOCTLCMD; |
| 264 | struct inode *inode = file->f_mapping->host; |
| 265 | struct block_device *bdev = inode->i_bdev; |
| 266 | struct gendisk *disk = bdev->bd_disk; |
| 267 | |
| 268 | switch (cmd) { |
| 269 | case BLKFLSBUF: |
| 270 | case BLKROSET: |
| 271 | /* |
| 272 | * the ones below are implemented in blkdev_locked_ioctl, |
| 273 | * but we call blkdev_ioctl, which gets the lock for us |
| 274 | */ |
| 275 | case BLKRRPART: |
| 276 | return blkdev_ioctl(inode, file, cmd, |
| 277 | (unsigned long)compat_ptr(arg)); |
| 278 | case BLKBSZSET_32: |
| 279 | return blkdev_ioctl(inode, file, BLKBSZSET, |
| 280 | (unsigned long)compat_ptr(arg)); |
| 281 | } |
| 282 | |
| 283 | lock_kernel(); |
| 284 | ret = compat_blkdev_locked_ioctl(inode, file, bdev, cmd, arg); |
| 285 | /* FIXME: why do we assume -> compat_ioctl needs the BKL? */ |
| 286 | if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl) |
| 287 | ret = disk->fops->compat_ioctl(file, cmd, arg); |
| 288 | unlock_kernel(); |
| 289 | |
Arnd Bergmann | 7199d4c | 2007-10-09 13:23:52 +0200 | [diff] [blame] | 290 | if (ret != -ENOIOCTLCMD) |
| 291 | return ret; |
| 292 | |
| 293 | return compat_blkdev_driver_ioctl(inode, file, disk, cmd, arg); |
Arnd Bergmann | f58c4c0 | 2007-10-09 13:23:51 +0200 | [diff] [blame] | 294 | } |