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;
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)
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 err = add_partition(disk, partno, start, length,
66 mutex_unlock(&bdev->bd_mutex);
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);
100 static int blkdev_reread_part(struct block_device *bdev)
102 struct gendisk *disk = bdev->bd_disk;
105 if (!disk_partitionable(disk) || bdev != bdev->bd_contains)
107 if (!capable(CAP_SYS_ADMIN))
109 if (!mutex_trylock(&bdev->bd_mutex))
111 res = rescan_partitions(disk, bdev);
112 mutex_unlock(&bdev->bd_mutex);
116 static void blk_ioc_discard_endio(struct bio *bio, int err)
119 if (err == -EOPNOTSUPP)
120 set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
121 clear_bit(BIO_UPTODATE, &bio->bi_flags);
123 complete(bio->bi_private);
126 static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
129 struct request_queue *q = bdev_get_queue(bdev);
139 if (start + len > (bdev->bd_inode->i_size >> 9))
142 if (!q->prepare_discard_fn)
145 while (len && !ret) {
146 DECLARE_COMPLETION_ONSTACK(wait);
149 bio = bio_alloc(GFP_KERNEL, 0);
153 bio->bi_end_io = blk_ioc_discard_endio;
155 bio->bi_private = &wait;
156 bio->bi_sector = start;
158 if (len > q->max_hw_sectors) {
159 bio->bi_size = q->max_hw_sectors << 9;
160 len -= q->max_hw_sectors;
161 start += q->max_hw_sectors;
163 bio->bi_size = len << 9;
166 submit_bio(DISCARD_NOBARRIER, bio);
168 wait_for_completion(&wait);
170 if (bio_flagged(bio, BIO_EOPNOTSUPP))
172 else if (!bio_flagged(bio, BIO_UPTODATE))
179 static int put_ushort(unsigned long arg, unsigned short val)
181 return put_user(val, (unsigned short __user *)arg);
184 static int put_int(unsigned long arg, int val)
186 return put_user(val, (int __user *)arg);
189 static int put_long(unsigned long arg, long val)
191 return put_user(val, (long __user *)arg);
194 static int put_ulong(unsigned long arg, unsigned long val)
196 return put_user(val, (unsigned long __user *)arg);
199 static int put_u64(unsigned long arg, u64 val)
201 return put_user(val, (u64 __user *)arg);
204 static int blkdev_locked_ioctl(struct file *file, struct block_device *bdev,
205 unsigned cmd, unsigned long arg)
207 struct backing_dev_info *bdi;
215 bdi = blk_get_backing_dev_info(bdev);
218 return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
220 return put_int(arg, bdev_read_only(bdev) != 0);
221 case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */
222 return put_int(arg, block_size(bdev));
223 case BLKSSZGET: /* get block device hardware sector size */
224 return put_int(arg, bdev_hardsect_size(bdev));
226 return put_ushort(arg, bdev_get_queue(bdev)->max_sectors);
229 if(!capable(CAP_SYS_ADMIN))
231 bdi = blk_get_backing_dev_info(bdev);
234 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
237 /* set the logical block size */
238 if (!capable(CAP_SYS_ADMIN))
242 if (get_user(n, (int __user *) arg))
244 if (bd_claim(bdev, file) < 0)
246 ret = set_blocksize(bdev, n);
250 return blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
252 return blkdev_reread_part(bdev);
254 if ((bdev->bd_inode->i_size >> 9) > ~0UL)
256 return put_ulong(arg, bdev->bd_inode->i_size >> 9);
258 return put_u64(arg, bdev->bd_inode->i_size);
262 case BLKTRACETEARDOWN:
263 return blk_trace_ioctl(bdev, cmd, (char __user *) arg);
268 int blkdev_driver_ioctl(struct inode *inode, struct file *file,
269 struct gendisk *disk, unsigned cmd, unsigned long arg)
275 if (file->f_flags & O_NDELAY)
276 mode |= FMODE_NDELAY_NOW;
279 if (disk->fops->__unlocked_ioctl)
280 return disk->fops->__unlocked_ioctl(file, cmd, arg);
282 if (disk->fops->__ioctl) {
284 ret = disk->fops->__ioctl(inode, file, cmd, arg);
289 return __blkdev_driver_ioctl(inode->i_bdev, mode, cmd, arg);
291 EXPORT_SYMBOL_GPL(blkdev_driver_ioctl);
293 int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
294 unsigned cmd, unsigned long arg)
296 struct gendisk *disk = bdev->bd_disk;
298 /* you bet it'll go away by the end of patch series */
299 struct file fake_file = {};
300 struct dentry fake_dentry = {};
301 fake_file.f_mode = mode;
302 fake_file.f_path.dentry = &fake_dentry;
303 fake_dentry.d_inode = bdev->bd_inode;
305 if (disk->fops->__unlocked_ioctl)
306 return disk->fops->__unlocked_ioctl(&fake_file, cmd, arg);
308 if (disk->fops->__ioctl) {
310 ret = disk->fops->__ioctl(bdev->bd_inode, &fake_file, cmd, arg);
315 if (disk->fops->ioctl)
316 return disk->fops->ioctl(bdev, mode, cmd, arg);
318 if (disk->fops->locked_ioctl) {
320 ret = disk->fops->locked_ioctl(bdev, mode, cmd, arg);
328 * For the record: _GPL here is only because somebody decided to slap it
329 * on the previous export. Sheer idiocy, since it wasn't copyrightable
330 * at all and could be open-coded without any exports by anybody who cares.
332 EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
335 * always keep this in sync with compat_blkdev_ioctl() and
336 * compat_blkdev_locked_ioctl()
338 int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd,
341 struct block_device *bdev = inode->i_bdev;
342 struct gendisk *disk = bdev->bd_disk;
347 if (!capable(CAP_SYS_ADMIN))
350 ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
351 /* -EINVAL to handle old uncorrected drivers */
352 if (ret != -EINVAL && ret != -ENOTTY)
357 invalidate_bdev(bdev);
362 ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
363 /* -EINVAL to handle old uncorrected drivers */
364 if (ret != -EINVAL && ret != -ENOTTY)
366 if (!capable(CAP_SYS_ADMIN))
368 if (get_user(n, (int __user *)(arg)))
371 set_device_ro(bdev, n);
378 if (!(file->f_mode & FMODE_WRITE))
381 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
384 return blk_ioctl_discard(bdev, range[0], range[1]);
388 struct hd_geometry geo;
392 if (!disk->fops->getgeo)
396 * We need to set the startsect first, the driver may
397 * want to override it.
399 geo.start = get_start_sect(bdev);
400 ret = disk->fops->getgeo(bdev, &geo);
403 if (copy_to_user((struct hd_geometry __user *)arg, &geo,
411 ret = blkdev_locked_ioctl(file, bdev, cmd, arg);
413 if (ret != -ENOIOCTLCMD)
416 return blkdev_driver_ioctl(inode, file, disk, cmd, arg);
418 EXPORT_SYMBOL_GPL(blkdev_ioctl);