1 #include <linux/capability.h>
2 #include <linux/blkdev.h>
3 #include <linux/blkpg.h>
4 #include <linux/hdreg.h>
5 #include <linux/backing-dev.h>
6 #include <linux/buffer_head.h>
7 #include <linux/smp_lock.h>
8 #include <linux/blktrace_api.h>
9 #include <asm/uaccess.h>
11 static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg)
13 struct block_device *bdevp;
15 struct hd_struct *part;
16 struct blkpg_ioctl_arg a;
17 struct blkpg_partition p;
18 struct disk_part_iter piter;
19 long long start, length;
22 if (!capable(CAP_SYS_ADMIN))
24 if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
26 if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
29 if (bdev != bdev->bd_contains)
35 case BLKPG_ADD_PARTITION:
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)
47 mutex_lock(&bdev->bd_mutex);
50 disk_part_iter_init(&piter, disk,
51 DISK_PITER_INCL_EMPTY);
52 while ((part = disk_part_iter_next(&piter))) {
53 if (!(start + length <= part->start_sect ||
54 start >= part->start_sect + part->nr_sects)) {
55 disk_part_iter_exit(&piter);
56 mutex_unlock(&bdev->bd_mutex);
60 disk_part_iter_exit(&piter);
63 part = add_partition(disk, partno, start, length,
65 mutex_unlock(&bdev->bd_mutex);
66 return IS_ERR(part) ? PTR_ERR(part) : 0;
67 case BLKPG_DEL_PARTITION:
68 part = disk_get_part(disk, partno);
72 bdevp = bdget(part_devt(part));
77 mutex_lock(&bdevp->bd_mutex);
78 if (bdevp->bd_openers) {
79 mutex_unlock(&bdevp->bd_mutex);
85 invalidate_bdev(bdevp);
87 mutex_lock_nested(&bdev->bd_mutex, 1);
88 delete_partition(disk, partno);
89 mutex_unlock(&bdev->bd_mutex);
90 mutex_unlock(&bdevp->bd_mutex);
99 static int blkdev_reread_part(struct block_device *bdev)
101 struct gendisk *disk = bdev->bd_disk;
104 if (!disk_partitionable(disk) || bdev != bdev->bd_contains)
106 if (!capable(CAP_SYS_ADMIN))
108 if (!mutex_trylock(&bdev->bd_mutex))
110 res = rescan_partitions(disk, bdev);
111 mutex_unlock(&bdev->bd_mutex);
115 static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
125 if (start + len > (bdev->bd_inode->i_size >> 9))
127 return blkdev_issue_discard(bdev, start, len, GFP_KERNEL,
131 static int put_ushort(unsigned long arg, unsigned short val)
133 return put_user(val, (unsigned short __user *)arg);
136 static int put_int(unsigned long arg, int val)
138 return put_user(val, (int __user *)arg);
141 static int put_long(unsigned long arg, long val)
143 return put_user(val, (long __user *)arg);
146 static int put_ulong(unsigned long arg, unsigned long val)
148 return put_user(val, (unsigned long __user *)arg);
151 static int put_u64(unsigned long arg, u64 val)
153 return put_user(val, (u64 __user *)arg);
156 int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
157 unsigned cmd, unsigned long arg)
159 struct gendisk *disk = bdev->bd_disk;
162 if (disk->fops->ioctl)
163 return disk->fops->ioctl(bdev, mode, cmd, arg);
165 if (disk->fops->locked_ioctl) {
167 ret = disk->fops->locked_ioctl(bdev, mode, cmd, arg);
175 * For the record: _GPL here is only because somebody decided to slap it
176 * on the previous export. Sheer idiocy, since it wasn't copyrightable
177 * at all and could be open-coded without any exports by anybody who cares.
179 EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
182 * always keep this in sync with compat_blkdev_ioctl() and
183 * compat_blkdev_locked_ioctl()
185 int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
188 struct gendisk *disk = bdev->bd_disk;
189 struct backing_dev_info *bdi;
195 if (!capable(CAP_SYS_ADMIN))
198 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
199 /* -EINVAL to handle old uncorrected drivers */
200 if (ret != -EINVAL && ret != -ENOTTY)
205 invalidate_bdev(bdev);
210 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
211 /* -EINVAL to handle old uncorrected drivers */
212 if (ret != -EINVAL && ret != -ENOTTY)
214 if (!capable(CAP_SYS_ADMIN))
216 if (get_user(n, (int __user *)(arg)))
219 set_device_ro(bdev, n);
226 if (!(mode & FMODE_WRITE))
229 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
232 return blk_ioctl_discard(bdev, range[0], range[1]);
236 struct hd_geometry geo;
240 if (!disk->fops->getgeo)
244 * We need to set the startsect first, the driver may
245 * want to override it.
247 geo.start = get_start_sect(bdev);
248 ret = disk->fops->getgeo(bdev, &geo);
251 if (copy_to_user((struct hd_geometry __user *)arg, &geo,
260 bdi = blk_get_backing_dev_info(bdev);
263 return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
265 return put_int(arg, bdev_read_only(bdev) != 0);
266 case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */
267 return put_int(arg, block_size(bdev));
268 case BLKSSZGET: /* get block device hardware sector size */
269 return put_int(arg, bdev_logical_block_size(bdev));
271 return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
274 if(!capable(CAP_SYS_ADMIN))
276 bdi = blk_get_backing_dev_info(bdev);
279 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
282 /* set the logical block size */
283 if (!capable(CAP_SYS_ADMIN))
287 if (get_user(n, (int __user *) arg))
289 if (!(mode & FMODE_EXCL) && bd_claim(bdev, &bdev) < 0)
291 ret = set_blocksize(bdev, n);
292 if (!(mode & FMODE_EXCL))
297 ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
302 ret = blkdev_reread_part(bdev);
306 size = bdev->bd_inode->i_size;
307 if ((size >> 9) > ~0UL)
309 return put_ulong(arg, size >> 9);
311 return put_u64(arg, bdev->bd_inode->i_size);
315 case BLKTRACETEARDOWN:
317 ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
321 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
325 EXPORT_SYMBOL_GPL(blkdev_ioctl);