1#include <linux/capability.h> 2#include <linux/blkdev.h> 3#include <linux/gfp.h> 4#include <linux/blkpg.h> 5#include <linux/hdreg.h> 6#include <linux/backing-dev.h> 7#include <linux/buffer_head.h> 8#include <linux/smp_lock.h> 9#include <linux/blktrace_api.h> 10#include <asm/uaccess.h> 11 12static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg) 13{ 14 struct block_device *bdevp; 15 struct gendisk *disk; 16 struct hd_struct *part; 17 struct blkpg_ioctl_arg a; 18 struct blkpg_partition p; 19 struct disk_part_iter piter; 20 long long start, length; 21 int partno; 22 23 if (!capable(CAP_SYS_ADMIN)) 24 return -EACCES; 25 if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg))) 26 return -EFAULT; 27 if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition))) 28 return -EFAULT; 29 disk = bdev->bd_disk; 30 if (bdev != bdev->bd_contains) 31 return -EINVAL; 32 partno = p.pno; 33 if (partno <= 0) 34 return -EINVAL; 35 switch (a.op) { 36 case BLKPG_ADD_PARTITION: 37 start = p.start >> 9; 38 length = p.length >> 9; 39 /* check for fit in a hd_struct */ 40 if (sizeof(sector_t) == sizeof(long) && 41 sizeof(long long) > sizeof(long)) { 42 long pstart = start, plength = length; 43 if (pstart != start || plength != length 44 || pstart < 0 || plength < 0) 45 return -EINVAL; 46 } 47 48 mutex_lock(&bdev->bd_mutex); 49 50 /* overlap? */ 51 disk_part_iter_init(&piter, disk, 52 DISK_PITER_INCL_EMPTY); 53 while ((part = disk_part_iter_next(&piter))) { 54 if (!(start + length <= part->start_sect || 55 start >= part->start_sect + part->nr_sects)) { 56 disk_part_iter_exit(&piter); 57 mutex_unlock(&bdev->bd_mutex); 58 return -EBUSY; 59 } 60 } 61 disk_part_iter_exit(&piter); 62 63 /* all seems OK */ 64 part = add_partition(disk, partno, start, length, 65 ADDPART_FLAG_NONE); 66 mutex_unlock(&bdev->bd_mutex); 67 return IS_ERR(part) ? PTR_ERR(part) : 0; 68 case BLKPG_DEL_PARTITION: 69 part = disk_get_part(disk, partno); 70 if (!part) 71 return -ENXIO; 72 73 bdevp = bdget(part_devt(part)); 74 disk_put_part(part); 75 if (!bdevp) 76 return -ENOMEM; 77 78 mutex_lock(&bdevp->bd_mutex); 79 if (bdevp->bd_openers) { 80 mutex_unlock(&bdevp->bd_mutex); 81 bdput(bdevp); 82 return -EBUSY; 83 } 84 /* all seems OK */ 85 fsync_bdev(bdevp); 86 invalidate_bdev(bdevp); 87 88 mutex_lock_nested(&bdev->bd_mutex, 1); 89 delete_partition(disk, partno); 90 mutex_unlock(&bdev->bd_mutex); 91 mutex_unlock(&bdevp->bd_mutex); 92 bdput(bdevp); 93 94 return 0; 95 default: 96 return -EINVAL; 97 } 98} 99 100static int blkdev_reread_part(struct block_device *bdev) 101{ 102 struct gendisk *disk = bdev->bd_disk; 103 int res; 104 105 if (!disk_partitionable(disk) || bdev != bdev->bd_contains) 106 return -EINVAL; 107 if (!capable(CAP_SYS_ADMIN)) 108 return -EACCES; 109 if (!mutex_trylock(&bdev->bd_mutex)) 110 return -EBUSY; 111 res = rescan_partitions(disk, bdev); 112 mutex_unlock(&bdev->bd_mutex); 113 return res; 114} 115 116static int blk_ioctl_discard(struct block_device *bdev, uint64_t start, 117 uint64_t len, int secure) 118{ 119 unsigned long flags = BLKDEV_IFL_WAIT; 120 121 if (start & 511) 122 return -EINVAL; 123 if (len & 511) 124 return -EINVAL; 125 start >>= 9; 126 len >>= 9; 127 128 if (start + len > (bdev->bd_inode->i_size >> 9)) 129 return -EINVAL; 130 if (secure) 131 flags |= BLKDEV_IFL_SECURE; 132 return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags); 133} 134 135static int put_ushort(unsigned long arg, unsigned short val) 136{ 137 return put_user(val, (unsigned short __user *)arg); 138} 139 140static int put_int(unsigned long arg, int val) 141{ 142 return put_user(val, (int __user *)arg); 143} 144 145static int put_uint(unsigned long arg, unsigned int val) 146{ 147 return put_user(val, (unsigned int __user *)arg); 148} 149 150static int put_long(unsigned long arg, long val) 151{ 152 return put_user(val, (long __user *)arg); 153} 154 155static int put_ulong(unsigned long arg, unsigned long val) 156{ 157 return put_user(val, (unsigned long __user *)arg); 158} 159 160static int put_u64(unsigned long arg, u64 val) 161{ 162 return put_user(val, (u64 __user *)arg); 163} 164 165int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode, 166 unsigned cmd, unsigned long arg) 167{ 168 struct gendisk *disk = bdev->bd_disk; 169 170 if (disk->fops->ioctl) 171 return disk->fops->ioctl(bdev, mode, cmd, arg); 172 173 return -ENOTTY; 174} 175/* 176 * For the record: _GPL here is only because somebody decided to slap it 177 * on the previous export. Sheer idiocy, since it wasn't copyrightable 178 * at all and could be open-coded without any exports by anybody who cares. 179 */ 180EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl); 181 182/* 183 * always keep this in sync with compat_blkdev_ioctl() 184 */ 185int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 186 unsigned long arg) 187{ 188 struct gendisk *disk = bdev->bd_disk; 189 struct backing_dev_info *bdi; 190 loff_t size; 191 int ret, n; 192 193 switch(cmd) { 194 case BLKFLSBUF: 195 if (!capable(CAP_SYS_ADMIN)) 196 return -EACCES; 197 198 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); 199 /* -EINVAL to handle old uncorrected drivers */ 200 if (ret != -EINVAL && ret != -ENOTTY) 201 return ret; 202 203 fsync_bdev(bdev); 204 invalidate_bdev(bdev); 205 return 0; 206 207 case BLKROSET: 208 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); 209 /* -EINVAL to handle old uncorrected drivers */ 210 if (ret != -EINVAL && ret != -ENOTTY) 211 return ret; 212 if (!capable(CAP_SYS_ADMIN)) 213 return -EACCES; 214 if (get_user(n, (int __user *)(arg))) 215 return -EFAULT; 216 set_device_ro(bdev, n); 217 return 0; 218 219 case BLKDISCARD: 220 case BLKSECDISCARD: { 221 uint64_t range[2]; 222 223 if (!(mode & FMODE_WRITE)) 224 return -EBADF; 225 226 if (copy_from_user(range, (void __user *)arg, sizeof(range))) 227 return -EFAULT; 228 229 return blk_ioctl_discard(bdev, range[0], range[1], 230 cmd == BLKSECDISCARD); 231 } 232 233 case HDIO_GETGEO: { 234 struct hd_geometry geo; 235 236 if (!arg) 237 return -EINVAL; 238 if (!disk->fops->getgeo) 239 return -ENOTTY; 240 241 /* 242 * We need to set the startsect first, the driver may 243 * want to override it. 244 */ 245 geo.start = get_start_sect(bdev); 246 ret = disk->fops->getgeo(bdev, &geo); 247 if (ret) 248 return ret; 249 if (copy_to_user((struct hd_geometry __user *)arg, &geo, 250 sizeof(geo))) 251 return -EFAULT; 252 return 0; 253 } 254 case BLKRAGET: 255 case BLKFRAGET: 256 if (!arg) 257 return -EINVAL; 258 bdi = blk_get_backing_dev_info(bdev); 259 if (bdi == NULL) 260 return -ENOTTY; 261 return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512); 262 case BLKROGET: 263 return put_int(arg, bdev_read_only(bdev) != 0); 264 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */ 265 return put_int(arg, block_size(bdev)); 266 case BLKSSZGET: /* get block device logical block size */ 267 return put_int(arg, bdev_logical_block_size(bdev)); 268 case BLKPBSZGET: /* get block device physical block size */ 269 return put_uint(arg, bdev_physical_block_size(bdev)); 270 case BLKIOMIN: 271 return put_uint(arg, bdev_io_min(bdev)); 272 case BLKIOOPT: 273 return put_uint(arg, bdev_io_opt(bdev)); 274 case BLKALIGNOFF: 275 return put_int(arg, bdev_alignment_offset(bdev)); 276 case BLKDISCARDZEROES: 277 return put_uint(arg, bdev_discard_zeroes_data(bdev)); 278 case BLKSECTGET: 279 return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev))); 280 case BLKRASET: 281 case BLKFRASET: 282 if(!capable(CAP_SYS_ADMIN)) 283 return -EACCES; 284 bdi = blk_get_backing_dev_info(bdev); 285 if (bdi == NULL) 286 return -ENOTTY; 287 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE; 288 return 0; 289 case BLKBSZSET: 290 /* set the logical block size */ 291 if (!capable(CAP_SYS_ADMIN)) 292 return -EACCES; 293 if (!arg) 294 return -EINVAL; 295 if (get_user(n, (int __user *) arg)) 296 return -EFAULT; 297 if (!(mode & FMODE_EXCL) && bd_claim(bdev, &bdev) < 0) 298 return -EBUSY; 299 ret = set_blocksize(bdev, n); 300 if (!(mode & FMODE_EXCL)) 301 bd_release(bdev); 302 return ret; 303 case BLKPG: 304 ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg); 305 break; 306 case BLKRRPART: 307 ret = blkdev_reread_part(bdev); 308 break; 309 case BLKGETSIZE: 310 size = bdev->bd_inode->i_size; 311 if ((size >> 9) > ~0UL) 312 return -EFBIG; 313 return put_ulong(arg, size >> 9); 314 case BLKGETSIZE64: 315 return put_u64(arg, bdev->bd_inode->i_size); 316 case BLKTRACESTART: 317 case BLKTRACESTOP: 318 case BLKTRACESETUP: 319 case BLKTRACETEARDOWN: 320 ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg); 321 break; 322 default: 323 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); 324 } 325 return ret; 326} 327EXPORT_SYMBOL_GPL(blkdev_ioctl); 328