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;
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)
32 if (partno <= 0 || partno >= disk->minors)
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 for (i = 0; i < disk->minors - 1; i++) {
51 struct hd_struct *s = disk->part[i];
55 if (!(start+length <= s->start_sect ||
56 start >= s->start_sect + s->nr_sects)) {
57 mutex_unlock(&bdev->bd_mutex);
62 err = add_partition(disk, partno, start, length,
64 mutex_unlock(&bdev->bd_mutex);
66 case BLKPG_DEL_PARTITION:
67 if (!disk->part[partno - 1])
69 bdevp = bdget_disk(disk, partno);
72 mutex_lock(&bdevp->bd_mutex);
73 if (bdevp->bd_openers) {
74 mutex_unlock(&bdevp->bd_mutex);
80 invalidate_bdev(bdevp);
82 mutex_lock_nested(&bdev->bd_mutex, 1);
83 delete_partition(disk, partno);
84 mutex_unlock(&bdev->bd_mutex);
85 mutex_unlock(&bdevp->bd_mutex);
94 static int blkdev_reread_part(struct block_device *bdev)
96 struct gendisk *disk = bdev->bd_disk;
99 if (disk->minors == 1 || bdev != bdev->bd_contains)
101 if (!capable(CAP_SYS_ADMIN))
103 if (!mutex_trylock(&bdev->bd_mutex))
105 res = rescan_partitions(disk, bdev);
106 mutex_unlock(&bdev->bd_mutex);
110 static void blk_ioc_discard_endio(struct bio *bio, int err)
113 if (err == -EOPNOTSUPP)
114 set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
115 clear_bit(BIO_UPTODATE, &bio->bi_flags);
117 complete(bio->bi_private);
120 static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
123 struct request_queue *q = bdev_get_queue(bdev);
133 if (start + len > (bdev->bd_inode->i_size >> 9))
136 if (!q->prepare_discard_fn)
139 while (len && !ret) {
140 DECLARE_COMPLETION_ONSTACK(wait);
143 bio = bio_alloc(GFP_KERNEL, 0);
147 bio->bi_end_io = blk_ioc_discard_endio;
149 bio->bi_private = &wait;
150 bio->bi_sector = start;
152 if (len > q->max_hw_sectors) {
153 bio->bi_size = q->max_hw_sectors << 9;
154 len -= q->max_hw_sectors;
155 start += q->max_hw_sectors;
157 bio->bi_size = len << 9;
160 submit_bio(DISCARD_NOBARRIER, bio);
162 wait_for_completion(&wait);
164 if (bio_flagged(bio, BIO_EOPNOTSUPP))
166 else if (!bio_flagged(bio, BIO_UPTODATE))
173 static int put_ushort(unsigned long arg, unsigned short val)
175 return put_user(val, (unsigned short __user *)arg);
178 static int put_int(unsigned long arg, int val)
180 return put_user(val, (int __user *)arg);
183 static int put_long(unsigned long arg, long val)
185 return put_user(val, (long __user *)arg);
188 static int put_ulong(unsigned long arg, unsigned long val)
190 return put_user(val, (unsigned long __user *)arg);
193 static int put_u64(unsigned long arg, u64 val)
195 return put_user(val, (u64 __user *)arg);
198 static int blkdev_locked_ioctl(struct file *file, struct block_device *bdev,
199 unsigned cmd, unsigned long arg)
201 struct backing_dev_info *bdi;
209 bdi = blk_get_backing_dev_info(bdev);
212 return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
214 return put_int(arg, bdev_read_only(bdev) != 0);
215 case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */
216 return put_int(arg, block_size(bdev));
217 case BLKSSZGET: /* get block device hardware sector size */
218 return put_int(arg, bdev_hardsect_size(bdev));
220 return put_ushort(arg, bdev_get_queue(bdev)->max_sectors);
223 if(!capable(CAP_SYS_ADMIN))
225 bdi = blk_get_backing_dev_info(bdev);
228 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
231 /* set the logical block size */
232 if (!capable(CAP_SYS_ADMIN))
236 if (get_user(n, (int __user *) arg))
238 if (bd_claim(bdev, file) < 0)
240 ret = set_blocksize(bdev, n);
244 return blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
246 return blkdev_reread_part(bdev);
248 if ((bdev->bd_inode->i_size >> 9) > ~0UL)
250 return put_ulong(arg, bdev->bd_inode->i_size >> 9);
252 return put_u64(arg, bdev->bd_inode->i_size);
256 case BLKTRACETEARDOWN:
257 return blk_trace_ioctl(bdev, cmd, (char __user *) arg);
262 int blkdev_driver_ioctl(struct inode *inode, struct file *file,
263 struct gendisk *disk, unsigned cmd, unsigned long arg)
266 if (disk->fops->unlocked_ioctl)
267 return disk->fops->unlocked_ioctl(file, cmd, arg);
269 if (disk->fops->ioctl) {
271 ret = disk->fops->ioctl(inode, file, cmd, arg);
278 EXPORT_SYMBOL_GPL(blkdev_driver_ioctl);
281 * always keep this in sync with compat_blkdev_ioctl() and
282 * compat_blkdev_locked_ioctl()
284 int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd,
287 struct block_device *bdev = inode->i_bdev;
288 struct gendisk *disk = bdev->bd_disk;
293 if (!capable(CAP_SYS_ADMIN))
296 ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
297 /* -EINVAL to handle old uncorrected drivers */
298 if (ret != -EINVAL && ret != -ENOTTY)
303 invalidate_bdev(bdev);
308 ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
309 /* -EINVAL to handle old uncorrected drivers */
310 if (ret != -EINVAL && ret != -ENOTTY)
312 if (!capable(CAP_SYS_ADMIN))
314 if (get_user(n, (int __user *)(arg)))
317 set_device_ro(bdev, n);
324 if (!(file->f_mode & FMODE_WRITE))
327 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
330 return blk_ioctl_discard(bdev, range[0], range[1]);
334 struct hd_geometry geo;
338 if (!disk->fops->getgeo)
342 * We need to set the startsect first, the driver may
343 * want to override it.
345 geo.start = get_start_sect(bdev);
346 ret = disk->fops->getgeo(bdev, &geo);
349 if (copy_to_user((struct hd_geometry __user *)arg, &geo,
357 ret = blkdev_locked_ioctl(file, bdev, cmd, arg);
359 if (ret != -ENOIOCTLCMD)
362 return blkdev_driver_ioctl(inode, file, disk, cmd, arg);
364 EXPORT_SYMBOL_GPL(blkdev_ioctl);