1 #include <linux/capability.h>
2 #include <linux/blkdev.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/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,
64 ADDPART_FLAG_NONE, NULL);
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,
116 uint64_t len, int secure)
118 unsigned long flags = 0;
127 if (start + len > (i_size_read(bdev->bd_inode) >> 9))
130 flags |= BLKDEV_DISCARD_SECURE;
131 return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags);
134 static int put_ushort(unsigned long arg, unsigned short val)
136 return put_user(val, (unsigned short __user *)arg);
139 static int put_int(unsigned long arg, int val)
141 return put_user(val, (int __user *)arg);
144 static int put_uint(unsigned long arg, unsigned int val)
146 return put_user(val, (unsigned int __user *)arg);
149 static int put_long(unsigned long arg, long val)
151 return put_user(val, (long __user *)arg);
154 static int put_ulong(unsigned long arg, unsigned long val)
156 return put_user(val, (unsigned long __user *)arg);
159 static int put_u64(unsigned long arg, u64 val)
161 return put_user(val, (u64 __user *)arg);
164 int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
165 unsigned cmd, unsigned long arg)
167 struct gendisk *disk = bdev->bd_disk;
169 if (disk->fops->ioctl)
170 return disk->fops->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()
184 int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
187 struct gendisk *disk = bdev->bd_disk;
188 struct backing_dev_info *bdi;
194 if (!capable(CAP_SYS_ADMIN))
197 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
198 /* -EINVAL to handle old uncorrected drivers */
199 if (ret != -EINVAL && ret != -ENOTTY)
203 invalidate_bdev(bdev);
207 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
208 /* -EINVAL to handle old uncorrected drivers */
209 if (ret != -EINVAL && ret != -ENOTTY)
211 if (!capable(CAP_SYS_ADMIN))
213 if (get_user(n, (int __user *)(arg)))
215 set_device_ro(bdev, n);
219 case BLKSECDISCARD: {
222 if (!(mode & FMODE_WRITE))
225 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
228 return blk_ioctl_discard(bdev, range[0], range[1],
229 cmd == BLKSECDISCARD);
233 struct hd_geometry geo;
237 if (!disk->fops->getgeo)
241 * We need to set the startsect first, the driver may
242 * want to override it.
244 memset(&geo, 0, sizeof(geo));
245 geo.start = get_start_sect(bdev);
246 ret = disk->fops->getgeo(bdev, &geo);
249 if (copy_to_user((struct hd_geometry __user *)arg, &geo,
258 bdi = blk_get_backing_dev_info(bdev);
261 return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
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));
271 return put_uint(arg, bdev_io_min(bdev));
273 return put_uint(arg, bdev_io_opt(bdev));
275 return put_int(arg, bdev_alignment_offset(bdev));
276 case BLKDISCARDZEROES:
277 return put_uint(arg, bdev_discard_zeroes_data(bdev));
279 return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
282 if(!capable(CAP_SYS_ADMIN))
284 bdi = blk_get_backing_dev_info(bdev);
287 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
290 /* set the logical block size */
291 if (!capable(CAP_SYS_ADMIN))
295 if (get_user(n, (int __user *) arg))
297 if (!(mode & FMODE_EXCL)) {
299 if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0)
302 ret = set_blocksize(bdev, n);
303 if (!(mode & FMODE_EXCL))
304 blkdev_put(bdev, mode | FMODE_EXCL);
307 ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
310 ret = blkdev_reread_part(bdev);
313 size = i_size_read(bdev->bd_inode);
314 if ((size >> 9) > ~0UL)
316 return put_ulong(arg, size >> 9);
318 return put_u64(arg, i_size_read(bdev->bd_inode));
322 case BLKTRACETEARDOWN:
323 ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
326 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
330 EXPORT_SYMBOL_GPL(blkdev_ioctl);