Randy.Dunlap | c59ede7 | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 1 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | #include <linux/blkdev.h> |
| 3 | #include <linux/blkpg.h> |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 4 | #include <linux/hdreg.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | #include <linux/backing-dev.h> |
| 6 | #include <linux/buffer_head.h> |
| 7 | #include <linux/smp_lock.h> |
Jens Axboe | 2056a78 | 2006-03-23 20:00:26 +0100 | [diff] [blame] | 8 | #include <linux/blktrace_api.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <asm/uaccess.h> |
| 10 | |
| 11 | static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg) |
| 12 | { |
| 13 | struct block_device *bdevp; |
| 14 | struct gendisk *disk; |
| 15 | struct blkpg_ioctl_arg a; |
| 16 | struct blkpg_partition p; |
| 17 | long long start, length; |
| 18 | int part; |
| 19 | int i; |
Abdel Benamrouche | 04ebd4a | 2008-07-25 01:48:26 -0700 | [diff] [blame] | 20 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
| 22 | if (!capable(CAP_SYS_ADMIN)) |
| 23 | return -EACCES; |
| 24 | if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg))) |
| 25 | return -EFAULT; |
| 26 | if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition))) |
| 27 | return -EFAULT; |
| 28 | disk = bdev->bd_disk; |
| 29 | if (bdev != bdev->bd_contains) |
| 30 | return -EINVAL; |
| 31 | part = p.pno; |
| 32 | if (part <= 0 || part >= disk->minors) |
| 33 | return -EINVAL; |
| 34 | switch (a.op) { |
| 35 | case BLKPG_ADD_PARTITION: |
| 36 | start = p.start >> 9; |
| 37 | length = p.length >> 9; |
| 38 | /* check for fit in a hd_struct */ |
| 39 | if (sizeof(sector_t) == sizeof(long) && |
| 40 | sizeof(long long) > sizeof(long)) { |
| 41 | long pstart = start, plength = length; |
| 42 | if (pstart != start || plength != length |
| 43 | || pstart < 0 || plength < 0) |
| 44 | return -EINVAL; |
| 45 | } |
Tejun Heo | 88e3412 | 2008-08-25 19:30:16 +0900 | [diff] [blame^] | 46 | |
Arjan van de Ven | c039e31 | 2006-03-23 03:00:28 -0800 | [diff] [blame] | 47 | mutex_lock(&bdev->bd_mutex); |
Tejun Heo | 88e3412 | 2008-08-25 19:30:16 +0900 | [diff] [blame^] | 48 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | /* overlap? */ |
| 50 | for (i = 0; i < disk->minors - 1; i++) { |
| 51 | struct hd_struct *s = disk->part[i]; |
| 52 | |
| 53 | if (!s) |
| 54 | continue; |
| 55 | if (!(start+length <= s->start_sect || |
| 56 | start >= s->start_sect + s->nr_sects)) { |
Arjan van de Ven | c039e31 | 2006-03-23 03:00:28 -0800 | [diff] [blame] | 57 | mutex_unlock(&bdev->bd_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | return -EBUSY; |
| 59 | } |
| 60 | } |
| 61 | /* all seems OK */ |
Abdel Benamrouche | 04ebd4a | 2008-07-25 01:48:26 -0700 | [diff] [blame] | 62 | err = add_partition(disk, part, start, length, ADDPART_FLAG_NONE); |
Arjan van de Ven | c039e31 | 2006-03-23 03:00:28 -0800 | [diff] [blame] | 63 | mutex_unlock(&bdev->bd_mutex); |
Abdel Benamrouche | 04ebd4a | 2008-07-25 01:48:26 -0700 | [diff] [blame] | 64 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | case BLKPG_DEL_PARTITION: |
| 66 | if (!disk->part[part-1]) |
| 67 | return -ENXIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | bdevp = bdget_disk(disk, part); |
| 69 | if (!bdevp) |
| 70 | return -ENOMEM; |
Peter Zijlstra | 2e7b651 | 2006-12-08 02:36:13 -0800 | [diff] [blame] | 71 | mutex_lock(&bdevp->bd_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | if (bdevp->bd_openers) { |
Arjan van de Ven | c039e31 | 2006-03-23 03:00:28 -0800 | [diff] [blame] | 73 | mutex_unlock(&bdevp->bd_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | bdput(bdevp); |
| 75 | return -EBUSY; |
| 76 | } |
| 77 | /* all seems OK */ |
| 78 | fsync_bdev(bdevp); |
Peter Zijlstra | f98393a | 2007-05-06 14:49:54 -0700 | [diff] [blame] | 79 | invalidate_bdev(bdevp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
Peter Zijlstra | 6d740cd | 2007-02-20 13:58:18 -0800 | [diff] [blame] | 81 | mutex_lock_nested(&bdev->bd_mutex, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | delete_partition(disk, part); |
Arjan van de Ven | c039e31 | 2006-03-23 03:00:28 -0800 | [diff] [blame] | 83 | mutex_unlock(&bdev->bd_mutex); |
| 84 | mutex_unlock(&bdevp->bd_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | bdput(bdevp); |
| 86 | |
| 87 | return 0; |
| 88 | default: |
| 89 | return -EINVAL; |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | static int blkdev_reread_part(struct block_device *bdev) |
| 94 | { |
| 95 | struct gendisk *disk = bdev->bd_disk; |
| 96 | int res; |
| 97 | |
| 98 | if (disk->minors == 1 || bdev != bdev->bd_contains) |
| 99 | return -EINVAL; |
| 100 | if (!capable(CAP_SYS_ADMIN)) |
| 101 | return -EACCES; |
Arjan van de Ven | c039e31 | 2006-03-23 03:00:28 -0800 | [diff] [blame] | 102 | if (!mutex_trylock(&bdev->bd_mutex)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | return -EBUSY; |
| 104 | res = rescan_partitions(disk, bdev); |
Arjan van de Ven | c039e31 | 2006-03-23 03:00:28 -0800 | [diff] [blame] | 105 | mutex_unlock(&bdev->bd_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | return res; |
| 107 | } |
| 108 | |
David Woodhouse | d30a260 | 2008-08-11 15:58:42 +0100 | [diff] [blame] | 109 | static void blk_ioc_discard_endio(struct bio *bio, int err) |
| 110 | { |
| 111 | if (err) { |
| 112 | if (err == -EOPNOTSUPP) |
| 113 | set_bit(BIO_EOPNOTSUPP, &bio->bi_flags); |
| 114 | clear_bit(BIO_UPTODATE, &bio->bi_flags); |
| 115 | } |
| 116 | complete(bio->bi_private); |
| 117 | } |
| 118 | |
| 119 | static int blk_ioctl_discard(struct block_device *bdev, uint64_t start, |
| 120 | uint64_t len) |
| 121 | { |
| 122 | struct request_queue *q = bdev_get_queue(bdev); |
| 123 | int ret = 0; |
| 124 | |
| 125 | if (start & 511) |
| 126 | return -EINVAL; |
| 127 | if (len & 511) |
| 128 | return -EINVAL; |
| 129 | start >>= 9; |
| 130 | len >>= 9; |
| 131 | |
| 132 | if (start + len > (bdev->bd_inode->i_size >> 9)) |
| 133 | return -EINVAL; |
| 134 | |
| 135 | if (!q->prepare_discard_fn) |
| 136 | return -EOPNOTSUPP; |
| 137 | |
| 138 | while (len && !ret) { |
| 139 | DECLARE_COMPLETION_ONSTACK(wait); |
| 140 | struct bio *bio; |
| 141 | |
| 142 | bio = bio_alloc(GFP_KERNEL, 0); |
| 143 | if (!bio) |
| 144 | return -ENOMEM; |
| 145 | |
| 146 | bio->bi_end_io = blk_ioc_discard_endio; |
| 147 | bio->bi_bdev = bdev; |
| 148 | bio->bi_private = &wait; |
| 149 | bio->bi_sector = start; |
| 150 | |
| 151 | if (len > q->max_hw_sectors) { |
| 152 | bio->bi_size = q->max_hw_sectors << 9; |
| 153 | len -= q->max_hw_sectors; |
| 154 | start += q->max_hw_sectors; |
| 155 | } else { |
| 156 | bio->bi_size = len << 9; |
| 157 | len = 0; |
| 158 | } |
David Woodhouse | e17fc0a | 2008-08-09 16:42:20 +0100 | [diff] [blame] | 159 | submit_bio(DISCARD_NOBARRIER, bio); |
David Woodhouse | d30a260 | 2008-08-11 15:58:42 +0100 | [diff] [blame] | 160 | |
| 161 | wait_for_completion(&wait); |
| 162 | |
| 163 | if (bio_flagged(bio, BIO_EOPNOTSUPP)) |
| 164 | ret = -EOPNOTSUPP; |
| 165 | else if (!bio_flagged(bio, BIO_UPTODATE)) |
| 166 | ret = -EIO; |
| 167 | bio_put(bio); |
| 168 | } |
| 169 | return ret; |
| 170 | } |
| 171 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | static int put_ushort(unsigned long arg, unsigned short val) |
| 173 | { |
| 174 | return put_user(val, (unsigned short __user *)arg); |
| 175 | } |
| 176 | |
| 177 | static int put_int(unsigned long arg, int val) |
| 178 | { |
| 179 | return put_user(val, (int __user *)arg); |
| 180 | } |
| 181 | |
| 182 | static int put_long(unsigned long arg, long val) |
| 183 | { |
| 184 | return put_user(val, (long __user *)arg); |
| 185 | } |
| 186 | |
| 187 | static int put_ulong(unsigned long arg, unsigned long val) |
| 188 | { |
| 189 | return put_user(val, (unsigned long __user *)arg); |
| 190 | } |
| 191 | |
| 192 | static int put_u64(unsigned long arg, u64 val) |
| 193 | { |
| 194 | return put_user(val, (u64 __user *)arg); |
| 195 | } |
| 196 | |
Arnd Bergmann | bb93e3a | 2005-06-23 00:10:15 -0700 | [diff] [blame] | 197 | static int blkdev_locked_ioctl(struct file *file, struct block_device *bdev, |
| 198 | unsigned cmd, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | struct backing_dev_info *bdi; |
| 201 | int ret, n; |
| 202 | |
| 203 | switch (cmd) { |
| 204 | case BLKRAGET: |
| 205 | case BLKFRAGET: |
| 206 | if (!arg) |
| 207 | return -EINVAL; |
| 208 | bdi = blk_get_backing_dev_info(bdev); |
| 209 | if (bdi == NULL) |
| 210 | return -ENOTTY; |
| 211 | return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512); |
| 212 | case BLKROGET: |
| 213 | return put_int(arg, bdev_read_only(bdev) != 0); |
| 214 | case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */ |
| 215 | return put_int(arg, block_size(bdev)); |
| 216 | case BLKSSZGET: /* get block device hardware sector size */ |
| 217 | return put_int(arg, bdev_hardsect_size(bdev)); |
| 218 | case BLKSECTGET: |
| 219 | return put_ushort(arg, bdev_get_queue(bdev)->max_sectors); |
| 220 | case BLKRASET: |
| 221 | case BLKFRASET: |
| 222 | if(!capable(CAP_SYS_ADMIN)) |
| 223 | return -EACCES; |
| 224 | bdi = blk_get_backing_dev_info(bdev); |
| 225 | if (bdi == NULL) |
| 226 | return -ENOTTY; |
| 227 | bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE; |
| 228 | return 0; |
| 229 | case BLKBSZSET: |
| 230 | /* set the logical block size */ |
| 231 | if (!capable(CAP_SYS_ADMIN)) |
| 232 | return -EACCES; |
| 233 | if (!arg) |
| 234 | return -EINVAL; |
| 235 | if (get_user(n, (int __user *) arg)) |
| 236 | return -EFAULT; |
| 237 | if (bd_claim(bdev, file) < 0) |
| 238 | return -EBUSY; |
| 239 | ret = set_blocksize(bdev, n); |
| 240 | bd_release(bdev); |
| 241 | return ret; |
| 242 | case BLKPG: |
| 243 | return blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg); |
| 244 | case BLKRRPART: |
| 245 | return blkdev_reread_part(bdev); |
| 246 | case BLKGETSIZE: |
| 247 | if ((bdev->bd_inode->i_size >> 9) > ~0UL) |
| 248 | return -EFBIG; |
| 249 | return put_ulong(arg, bdev->bd_inode->i_size >> 9); |
| 250 | case BLKGETSIZE64: |
| 251 | return put_u64(arg, bdev->bd_inode->i_size); |
Jens Axboe | 2056a78 | 2006-03-23 20:00:26 +0100 | [diff] [blame] | 252 | case BLKTRACESTART: |
| 253 | case BLKTRACESTOP: |
| 254 | case BLKTRACESETUP: |
| 255 | case BLKTRACETEARDOWN: |
| 256 | return blk_trace_ioctl(bdev, cmd, (char __user *) arg); |
Arnd Bergmann | bb93e3a | 2005-06-23 00:10:15 -0700 | [diff] [blame] | 257 | } |
| 258 | return -ENOIOCTLCMD; |
| 259 | } |
| 260 | |
Alasdair G Kergon | 7006f6e | 2006-10-03 01:15:21 -0700 | [diff] [blame] | 261 | int blkdev_driver_ioctl(struct inode *inode, struct file *file, |
| 262 | struct gendisk *disk, unsigned cmd, unsigned long arg) |
Arnd Bergmann | bb93e3a | 2005-06-23 00:10:15 -0700 | [diff] [blame] | 263 | { |
| 264 | int ret; |
| 265 | if (disk->fops->unlocked_ioctl) |
| 266 | return disk->fops->unlocked_ioctl(file, cmd, arg); |
| 267 | |
| 268 | if (disk->fops->ioctl) { |
| 269 | lock_kernel(); |
| 270 | ret = disk->fops->ioctl(inode, file, cmd, arg); |
| 271 | unlock_kernel(); |
| 272 | return ret; |
| 273 | } |
| 274 | |
| 275 | return -ENOTTY; |
| 276 | } |
Alasdair G Kergon | 7006f6e | 2006-10-03 01:15:21 -0700 | [diff] [blame] | 277 | EXPORT_SYMBOL_GPL(blkdev_driver_ioctl); |
Arnd Bergmann | bb93e3a | 2005-06-23 00:10:15 -0700 | [diff] [blame] | 278 | |
Arnd Bergmann | f58c4c0 | 2007-10-09 13:23:51 +0200 | [diff] [blame] | 279 | /* |
| 280 | * always keep this in sync with compat_blkdev_ioctl() and |
| 281 | * compat_blkdev_locked_ioctl() |
| 282 | */ |
Arnd Bergmann | bb93e3a | 2005-06-23 00:10:15 -0700 | [diff] [blame] | 283 | int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd, |
| 284 | unsigned long arg) |
| 285 | { |
| 286 | struct block_device *bdev = inode->i_bdev; |
| 287 | struct gendisk *disk = bdev->bd_disk; |
| 288 | int ret, n; |
| 289 | |
| 290 | switch(cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | case BLKFLSBUF: |
| 292 | if (!capable(CAP_SYS_ADMIN)) |
| 293 | return -EACCES; |
Arnd Bergmann | bb93e3a | 2005-06-23 00:10:15 -0700 | [diff] [blame] | 294 | |
| 295 | ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg); |
| 296 | /* -EINVAL to handle old uncorrected drivers */ |
| 297 | if (ret != -EINVAL && ret != -ENOTTY) |
| 298 | return ret; |
| 299 | |
| 300 | lock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | fsync_bdev(bdev); |
Peter Zijlstra | f98393a | 2007-05-06 14:49:54 -0700 | [diff] [blame] | 302 | invalidate_bdev(bdev); |
Arnd Bergmann | bb93e3a | 2005-06-23 00:10:15 -0700 | [diff] [blame] | 303 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | return 0; |
Arnd Bergmann | bb93e3a | 2005-06-23 00:10:15 -0700 | [diff] [blame] | 305 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | case BLKROSET: |
Arnd Bergmann | bb93e3a | 2005-06-23 00:10:15 -0700 | [diff] [blame] | 307 | ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg); |
| 308 | /* -EINVAL to handle old uncorrected drivers */ |
| 309 | if (ret != -EINVAL && ret != -ENOTTY) |
| 310 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | if (!capable(CAP_SYS_ADMIN)) |
| 312 | return -EACCES; |
| 313 | if (get_user(n, (int __user *)(arg))) |
| 314 | return -EFAULT; |
Arnd Bergmann | bb93e3a | 2005-06-23 00:10:15 -0700 | [diff] [blame] | 315 | lock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | set_device_ro(bdev, n); |
Arnd Bergmann | bb93e3a | 2005-06-23 00:10:15 -0700 | [diff] [blame] | 317 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | return 0; |
David Woodhouse | d30a260 | 2008-08-11 15:58:42 +0100 | [diff] [blame] | 319 | |
| 320 | case BLKDISCARD: { |
| 321 | uint64_t range[2]; |
| 322 | |
| 323 | if (!(file->f_mode & FMODE_WRITE)) |
| 324 | return -EBADF; |
| 325 | |
| 326 | if (copy_from_user(range, (void __user *)arg, sizeof(range))) |
| 327 | return -EFAULT; |
| 328 | |
| 329 | return blk_ioctl_discard(bdev, range[0], range[1]); |
| 330 | } |
| 331 | |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 332 | case HDIO_GETGEO: { |
| 333 | struct hd_geometry geo; |
| 334 | |
| 335 | if (!arg) |
| 336 | return -EINVAL; |
| 337 | if (!disk->fops->getgeo) |
| 338 | return -ENOTTY; |
| 339 | |
| 340 | /* |
| 341 | * We need to set the startsect first, the driver may |
| 342 | * want to override it. |
| 343 | */ |
| 344 | geo.start = get_start_sect(bdev); |
| 345 | ret = disk->fops->getgeo(bdev, &geo); |
| 346 | if (ret) |
| 347 | return ret; |
| 348 | if (copy_to_user((struct hd_geometry __user *)arg, &geo, |
| 349 | sizeof(geo))) |
| 350 | return -EFAULT; |
| 351 | return 0; |
| 352 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | } |
Arnd Bergmann | bb93e3a | 2005-06-23 00:10:15 -0700 | [diff] [blame] | 354 | |
| 355 | lock_kernel(); |
| 356 | ret = blkdev_locked_ioctl(file, bdev, cmd, arg); |
| 357 | unlock_kernel(); |
| 358 | if (ret != -ENOIOCTLCMD) |
| 359 | return ret; |
| 360 | |
| 361 | return blkdev_driver_ioctl(inode, file, disk, cmd, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | } |
Stephen Tweedie | 68f66fe | 2005-05-13 23:31:19 -0400 | [diff] [blame] | 363 | EXPORT_SYMBOL_GPL(blkdev_ioctl); |