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 blkpg_ioctl_arg a;
16 struct blkpg_partition p;
17 long long start, length;
21 if (!capable(CAP_SYS_ADMIN))
23 if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
25 if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
28 if (bdev != bdev->bd_contains)
31 if (part <= 0 || part >= disk->minors)
34 case BLKPG_ADD_PARTITION:
36 length = p.length >> 9;
37 /* check for fit in a hd_struct */
38 if (sizeof(sector_t) == sizeof(long) &&
39 sizeof(long long) > sizeof(long)) {
40 long pstart = start, plength = length;
41 if (pstart != start || plength != length
42 || pstart < 0 || plength < 0)
45 /* partition number in use? */
46 mutex_lock(&bdev->bd_mutex);
47 if (disk->part[part - 1]) {
48 mutex_unlock(&bdev->bd_mutex);
52 for (i = 0; i < disk->minors - 1; i++) {
53 struct hd_struct *s = disk->part[i];
57 if (!(start+length <= s->start_sect ||
58 start >= s->start_sect + s->nr_sects)) {
59 mutex_unlock(&bdev->bd_mutex);
64 add_partition(disk, part, start, length);
65 mutex_unlock(&bdev->bd_mutex);
67 case BLKPG_DEL_PARTITION:
68 if (!disk->part[part-1])
70 if (disk->part[part - 1]->nr_sects == 0)
72 bdevp = bdget_disk(disk, part);
75 mutex_lock(&bdevp->bd_mutex);
76 if (bdevp->bd_openers) {
77 mutex_unlock(&bdevp->bd_mutex);
83 invalidate_bdev(bdevp, 0);
85 mutex_lock(&bdev->bd_mutex);
86 delete_partition(disk, part);
87 mutex_unlock(&bdev->bd_mutex);
88 mutex_unlock(&bdevp->bd_mutex);
97 static int blkdev_reread_part(struct block_device *bdev)
99 struct gendisk *disk = bdev->bd_disk;
102 if (disk->minors == 1 || bdev != bdev->bd_contains)
104 if (!capable(CAP_SYS_ADMIN))
106 if (!mutex_trylock(&bdev->bd_mutex))
108 res = rescan_partitions(disk, bdev);
109 mutex_unlock(&bdev->bd_mutex);
113 static int put_ushort(unsigned long arg, unsigned short val)
115 return put_user(val, (unsigned short __user *)arg);
118 static int put_int(unsigned long arg, int val)
120 return put_user(val, (int __user *)arg);
123 static int put_long(unsigned long arg, long val)
125 return put_user(val, (long __user *)arg);
128 static int put_ulong(unsigned long arg, unsigned long val)
130 return put_user(val, (unsigned long __user *)arg);
133 static int put_u64(unsigned long arg, u64 val)
135 return put_user(val, (u64 __user *)arg);
138 static int blkdev_locked_ioctl(struct file *file, struct block_device *bdev,
139 unsigned cmd, unsigned long arg)
141 struct backing_dev_info *bdi;
149 bdi = blk_get_backing_dev_info(bdev);
152 return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
154 return put_int(arg, bdev_read_only(bdev) != 0);
155 case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */
156 return put_int(arg, block_size(bdev));
157 case BLKSSZGET: /* get block device hardware sector size */
158 return put_int(arg, bdev_hardsect_size(bdev));
160 return put_ushort(arg, bdev_get_queue(bdev)->max_sectors);
163 if(!capable(CAP_SYS_ADMIN))
165 bdi = blk_get_backing_dev_info(bdev);
168 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
171 /* set the logical block size */
172 if (!capable(CAP_SYS_ADMIN))
176 if (get_user(n, (int __user *) arg))
178 if (bd_claim(bdev, file) < 0)
180 ret = set_blocksize(bdev, n);
184 return blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
186 return blkdev_reread_part(bdev);
188 if ((bdev->bd_inode->i_size >> 9) > ~0UL)
190 return put_ulong(arg, bdev->bd_inode->i_size >> 9);
192 return put_u64(arg, bdev->bd_inode->i_size);
196 case BLKTRACETEARDOWN:
197 return blk_trace_ioctl(bdev, cmd, (char __user *) arg);
202 static int blkdev_driver_ioctl(struct inode *inode, struct file *file,
203 struct gendisk *disk, unsigned cmd, unsigned long arg)
206 if (disk->fops->unlocked_ioctl)
207 return disk->fops->unlocked_ioctl(file, cmd, arg);
209 if (disk->fops->ioctl) {
211 ret = disk->fops->ioctl(inode, file, cmd, arg);
219 int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd,
222 struct block_device *bdev = inode->i_bdev;
223 struct gendisk *disk = bdev->bd_disk;
228 if (!capable(CAP_SYS_ADMIN))
231 ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
232 /* -EINVAL to handle old uncorrected drivers */
233 if (ret != -EINVAL && ret != -ENOTTY)
238 invalidate_bdev(bdev, 0);
243 ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
244 /* -EINVAL to handle old uncorrected drivers */
245 if (ret != -EINVAL && ret != -ENOTTY)
247 if (!capable(CAP_SYS_ADMIN))
249 if (get_user(n, (int __user *)(arg)))
252 set_device_ro(bdev, n);
256 struct hd_geometry geo;
260 if (!disk->fops->getgeo)
264 * We need to set the startsect first, the driver may
265 * want to override it.
267 geo.start = get_start_sect(bdev);
268 ret = disk->fops->getgeo(bdev, &geo);
271 if (copy_to_user((struct hd_geometry __user *)arg, &geo,
279 ret = blkdev_locked_ioctl(file, bdev, cmd, arg);
281 if (ret != -ENOIOCTLCMD)
284 return blkdev_driver_ioctl(inode, file, disk, cmd, arg);
287 /* Most of the generic ioctls are handled in the normal fallback path.
288 This assumes the blkdev's low level compat_ioctl always returns
289 ENOIOCTLCMD for unknown ioctls. */
290 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
292 struct block_device *bdev = file->f_dentry->d_inode->i_bdev;
293 struct gendisk *disk = bdev->bd_disk;
294 int ret = -ENOIOCTLCMD;
295 if (disk->fops->compat_ioctl) {
297 ret = disk->fops->compat_ioctl(file, cmd, arg);
303 EXPORT_SYMBOL_GPL(blkdev_ioctl);