1 #include <linux/capability.h>
2 #include <linux/blkdev.h>
3 #include <linux/export.h>
5 #include <linux/blkpg.h>
6 #include <linux/hdreg.h>
7 #include <linux/backing-dev.h>
9 #include <linux/blktrace_api.h>
10 #include <asm/uaccess.h>
12 static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg)
14 struct block_device *bdevp;
16 struct hd_struct *part, *lpart;
17 struct blkpg_ioctl_arg a;
18 struct blkpg_partition p;
19 struct disk_part_iter piter;
20 long long start, length;
23 if (!capable(CAP_SYS_ADMIN))
25 if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
27 if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
30 if (bdev != bdev->bd_contains)
36 case BLKPG_ADD_PARTITION:
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 || partno > 65535)
48 mutex_lock(&bdev->bd_mutex);
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);
61 disk_part_iter_exit(&piter);
64 part = add_partition(disk, partno, start, length,
65 ADDPART_FLAG_NONE, NULL);
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);
73 bdevp = bdget(part_devt(part));
78 mutex_lock(&bdevp->bd_mutex);
79 if (bdevp->bd_openers) {
80 mutex_unlock(&bdevp->bd_mutex);
86 invalidate_bdev(bdevp);
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);
95 case BLKPG_RESIZE_PARTITION:
97 /* new length of partition in bytes */
98 length = p.length >> 9;
99 /* check for fit in a hd_struct */
100 if (sizeof(sector_t) == sizeof(long) &&
101 sizeof(long long) > sizeof(long)) {
102 long pstart = start, plength = length;
103 if (pstart != start || plength != length
104 || pstart < 0 || plength < 0)
107 part = disk_get_part(disk, partno);
110 bdevp = bdget(part_devt(part));
115 mutex_lock(&bdevp->bd_mutex);
116 mutex_lock_nested(&bdev->bd_mutex, 1);
117 if (start != part->start_sect) {
118 mutex_unlock(&bdevp->bd_mutex);
119 mutex_unlock(&bdev->bd_mutex);
125 disk_part_iter_init(&piter, disk,
126 DISK_PITER_INCL_EMPTY);
127 while ((lpart = disk_part_iter_next(&piter))) {
128 if (lpart->partno != partno &&
129 !(start + length <= lpart->start_sect ||
130 start >= lpart->start_sect + lpart->nr_sects)
132 disk_part_iter_exit(&piter);
133 mutex_unlock(&bdevp->bd_mutex);
134 mutex_unlock(&bdev->bd_mutex);
140 disk_part_iter_exit(&piter);
141 part_nr_sects_write(part, (sector_t)length);
142 i_size_write(bdevp->bd_inode, p.length);
143 mutex_unlock(&bdevp->bd_mutex);
144 mutex_unlock(&bdev->bd_mutex);
153 static int blkdev_reread_part(struct block_device *bdev)
155 struct gendisk *disk = bdev->bd_disk;
158 if (!disk_part_scan_enabled(disk) || bdev != bdev->bd_contains)
160 if (!capable(CAP_SYS_ADMIN))
162 if (!mutex_trylock(&bdev->bd_mutex))
164 res = rescan_partitions(disk, bdev);
165 mutex_unlock(&bdev->bd_mutex);
169 static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
170 uint64_t len, int secure)
172 unsigned long flags = 0;
181 if (start + len > (i_size_read(bdev->bd_inode) >> 9))
184 flags |= BLKDEV_DISCARD_SECURE;
185 return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags);
188 static int put_ushort(unsigned long arg, unsigned short val)
190 return put_user(val, (unsigned short __user *)arg);
193 static int put_int(unsigned long arg, int val)
195 return put_user(val, (int __user *)arg);
198 static int put_uint(unsigned long arg, unsigned int val)
200 return put_user(val, (unsigned int __user *)arg);
203 static int put_long(unsigned long arg, long val)
205 return put_user(val, (long __user *)arg);
208 static int put_ulong(unsigned long arg, unsigned long val)
210 return put_user(val, (unsigned long __user *)arg);
213 static int put_u64(unsigned long arg, u64 val)
215 return put_user(val, (u64 __user *)arg);
218 int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
219 unsigned cmd, unsigned long arg)
221 struct gendisk *disk = bdev->bd_disk;
223 if (disk->fops->ioctl)
224 return disk->fops->ioctl(bdev, mode, cmd, arg);
229 * For the record: _GPL here is only because somebody decided to slap it
230 * on the previous export. Sheer idiocy, since it wasn't copyrightable
231 * at all and could be open-coded without any exports by anybody who cares.
233 EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
236 * Is it an unrecognized ioctl? The correct returns are either
237 * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a
238 * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl
239 * code before returning.
241 * Confused drivers sometimes return EINVAL, which is wrong. It
242 * means "I understood the ioctl command, but the parameters to
245 * We should aim to just fix the broken drivers, the EINVAL case
248 static inline int is_unrecognized_ioctl(int ret)
250 return ret == -EINVAL ||
256 * always keep this in sync with compat_blkdev_ioctl()
258 int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
261 struct gendisk *disk = bdev->bd_disk;
262 struct backing_dev_info *bdi;
268 if (!capable(CAP_SYS_ADMIN))
271 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
272 if (!is_unrecognized_ioctl(ret))
276 invalidate_bdev(bdev);
280 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
281 if (!is_unrecognized_ioctl(ret))
283 if (!capable(CAP_SYS_ADMIN))
285 if (get_user(n, (int __user *)(arg)))
287 set_device_ro(bdev, n);
291 case BLKSECDISCARD: {
294 if (!(mode & FMODE_WRITE))
297 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
300 return blk_ioctl_discard(bdev, range[0], range[1],
301 cmd == BLKSECDISCARD);
305 struct hd_geometry geo;
309 if (!disk->fops->getgeo)
313 * We need to set the startsect first, the driver may
314 * want to override it.
316 memset(&geo, 0, sizeof(geo));
317 geo.start = get_start_sect(bdev);
318 ret = disk->fops->getgeo(bdev, &geo);
321 if (copy_to_user((struct hd_geometry __user *)arg, &geo,
330 bdi = blk_get_backing_dev_info(bdev);
333 return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
335 return put_int(arg, bdev_read_only(bdev) != 0);
336 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
337 return put_int(arg, block_size(bdev));
338 case BLKSSZGET: /* get block device logical block size */
339 return put_int(arg, bdev_logical_block_size(bdev));
340 case BLKPBSZGET: /* get block device physical block size */
341 return put_uint(arg, bdev_physical_block_size(bdev));
343 return put_uint(arg, bdev_io_min(bdev));
345 return put_uint(arg, bdev_io_opt(bdev));
347 return put_int(arg, bdev_alignment_offset(bdev));
348 case BLKDISCARDZEROES:
349 return put_uint(arg, bdev_discard_zeroes_data(bdev));
351 return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
353 return put_ushort(arg, !blk_queue_nonrot(bdev_get_queue(bdev)));
356 if(!capable(CAP_SYS_ADMIN))
358 bdi = blk_get_backing_dev_info(bdev);
361 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
364 /* set the logical block size */
365 if (!capable(CAP_SYS_ADMIN))
369 if (get_user(n, (int __user *) arg))
371 if (!(mode & FMODE_EXCL)) {
373 if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0)
376 ret = set_blocksize(bdev, n);
377 if (!(mode & FMODE_EXCL))
378 blkdev_put(bdev, mode | FMODE_EXCL);
381 ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
384 ret = blkdev_reread_part(bdev);
387 size = i_size_read(bdev->bd_inode);
388 if ((size >> 9) > ~0UL)
390 return put_ulong(arg, size >> 9);
392 return put_u64(arg, i_size_read(bdev->bd_inode));
396 case BLKTRACETEARDOWN:
397 ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
400 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
404 EXPORT_SYMBOL_GPL(blkdev_ioctl);