mirror of
https://github.com/torvalds/linux.git
synced 2024-11-05 11:32:04 +00:00
304 lines
7.4 KiB
C
304 lines
7.4 KiB
C
#include <linux/capability.h>
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#include <linux/blkdev.h>
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#include <linux/blkpg.h>
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#include <linux/hdreg.h>
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#include <linux/backing-dev.h>
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#include <linux/buffer_head.h>
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#include <linux/smp_lock.h>
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#include <linux/blktrace_api.h>
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#include <asm/uaccess.h>
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static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg)
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{
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struct block_device *bdevp;
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struct gendisk *disk;
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struct blkpg_ioctl_arg a;
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struct blkpg_partition p;
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long long start, length;
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int part;
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int i;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
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return -EFAULT;
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if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
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return -EFAULT;
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disk = bdev->bd_disk;
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if (bdev != bdev->bd_contains)
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return -EINVAL;
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part = p.pno;
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if (part <= 0 || part >= disk->minors)
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return -EINVAL;
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switch (a.op) {
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case BLKPG_ADD_PARTITION:
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start = p.start >> 9;
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length = p.length >> 9;
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/* check for fit in a hd_struct */
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if (sizeof(sector_t) == sizeof(long) &&
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sizeof(long long) > sizeof(long)) {
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long pstart = start, plength = length;
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if (pstart != start || plength != length
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|| pstart < 0 || plength < 0)
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return -EINVAL;
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}
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/* partition number in use? */
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mutex_lock(&bdev->bd_mutex);
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if (disk->part[part - 1]) {
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mutex_unlock(&bdev->bd_mutex);
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return -EBUSY;
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}
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/* overlap? */
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for (i = 0; i < disk->minors - 1; i++) {
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struct hd_struct *s = disk->part[i];
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if (!s)
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continue;
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if (!(start+length <= s->start_sect ||
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start >= s->start_sect + s->nr_sects)) {
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mutex_unlock(&bdev->bd_mutex);
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return -EBUSY;
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}
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}
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/* all seems OK */
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add_partition(disk, part, start, length);
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mutex_unlock(&bdev->bd_mutex);
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return 0;
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case BLKPG_DEL_PARTITION:
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if (!disk->part[part-1])
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return -ENXIO;
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if (disk->part[part - 1]->nr_sects == 0)
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return -ENXIO;
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bdevp = bdget_disk(disk, part);
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if (!bdevp)
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return -ENOMEM;
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mutex_lock(&bdevp->bd_mutex);
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if (bdevp->bd_openers) {
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mutex_unlock(&bdevp->bd_mutex);
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bdput(bdevp);
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return -EBUSY;
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}
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/* all seems OK */
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fsync_bdev(bdevp);
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invalidate_bdev(bdevp, 0);
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mutex_lock(&bdev->bd_mutex);
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delete_partition(disk, part);
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mutex_unlock(&bdev->bd_mutex);
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mutex_unlock(&bdevp->bd_mutex);
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bdput(bdevp);
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return 0;
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default:
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return -EINVAL;
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}
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}
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static int blkdev_reread_part(struct block_device *bdev)
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{
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struct gendisk *disk = bdev->bd_disk;
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int res;
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if (disk->minors == 1 || bdev != bdev->bd_contains)
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return -EINVAL;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (!mutex_trylock(&bdev->bd_mutex))
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return -EBUSY;
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res = rescan_partitions(disk, bdev);
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mutex_unlock(&bdev->bd_mutex);
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return res;
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}
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static int put_ushort(unsigned long arg, unsigned short val)
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{
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return put_user(val, (unsigned short __user *)arg);
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}
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static int put_int(unsigned long arg, int val)
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{
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return put_user(val, (int __user *)arg);
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}
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static int put_long(unsigned long arg, long val)
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{
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return put_user(val, (long __user *)arg);
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}
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static int put_ulong(unsigned long arg, unsigned long val)
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{
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return put_user(val, (unsigned long __user *)arg);
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}
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static int put_u64(unsigned long arg, u64 val)
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{
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return put_user(val, (u64 __user *)arg);
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}
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static int blkdev_locked_ioctl(struct file *file, struct block_device *bdev,
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unsigned cmd, unsigned long arg)
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{
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struct backing_dev_info *bdi;
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int ret, n;
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switch (cmd) {
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case BLKRAGET:
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case BLKFRAGET:
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if (!arg)
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return -EINVAL;
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bdi = blk_get_backing_dev_info(bdev);
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if (bdi == NULL)
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return -ENOTTY;
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return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
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case BLKROGET:
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return put_int(arg, bdev_read_only(bdev) != 0);
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case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */
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return put_int(arg, block_size(bdev));
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case BLKSSZGET: /* get block device hardware sector size */
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return put_int(arg, bdev_hardsect_size(bdev));
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case BLKSECTGET:
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return put_ushort(arg, bdev_get_queue(bdev)->max_sectors);
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case BLKRASET:
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case BLKFRASET:
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if(!capable(CAP_SYS_ADMIN))
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return -EACCES;
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bdi = blk_get_backing_dev_info(bdev);
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if (bdi == NULL)
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return -ENOTTY;
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bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
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return 0;
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case BLKBSZSET:
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/* set the logical block size */
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (!arg)
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return -EINVAL;
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if (get_user(n, (int __user *) arg))
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return -EFAULT;
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if (bd_claim(bdev, file) < 0)
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return -EBUSY;
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ret = set_blocksize(bdev, n);
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bd_release(bdev);
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return ret;
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case BLKPG:
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return blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
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case BLKRRPART:
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return blkdev_reread_part(bdev);
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case BLKGETSIZE:
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if ((bdev->bd_inode->i_size >> 9) > ~0UL)
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return -EFBIG;
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return put_ulong(arg, bdev->bd_inode->i_size >> 9);
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case BLKGETSIZE64:
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return put_u64(arg, bdev->bd_inode->i_size);
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case BLKTRACESTART:
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case BLKTRACESTOP:
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case BLKTRACESETUP:
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case BLKTRACETEARDOWN:
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return blk_trace_ioctl(bdev, cmd, (char __user *) arg);
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}
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return -ENOIOCTLCMD;
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}
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static int blkdev_driver_ioctl(struct inode *inode, struct file *file,
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struct gendisk *disk, unsigned cmd, unsigned long arg)
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{
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int ret;
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if (disk->fops->unlocked_ioctl)
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return disk->fops->unlocked_ioctl(file, cmd, arg);
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if (disk->fops->ioctl) {
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lock_kernel();
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ret = disk->fops->ioctl(inode, file, cmd, arg);
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unlock_kernel();
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return ret;
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}
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return -ENOTTY;
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}
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int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd,
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unsigned long arg)
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{
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struct block_device *bdev = inode->i_bdev;
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struct gendisk *disk = bdev->bd_disk;
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int ret, n;
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switch(cmd) {
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case BLKFLSBUF:
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
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/* -EINVAL to handle old uncorrected drivers */
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if (ret != -EINVAL && ret != -ENOTTY)
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return ret;
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lock_kernel();
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fsync_bdev(bdev);
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invalidate_bdev(bdev, 0);
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unlock_kernel();
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return 0;
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case BLKROSET:
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ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
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/* -EINVAL to handle old uncorrected drivers */
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if (ret != -EINVAL && ret != -ENOTTY)
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return ret;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (get_user(n, (int __user *)(arg)))
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return -EFAULT;
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lock_kernel();
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set_device_ro(bdev, n);
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unlock_kernel();
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return 0;
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case HDIO_GETGEO: {
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struct hd_geometry geo;
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if (!arg)
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return -EINVAL;
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if (!disk->fops->getgeo)
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return -ENOTTY;
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/*
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* We need to set the startsect first, the driver may
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* want to override it.
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*/
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geo.start = get_start_sect(bdev);
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ret = disk->fops->getgeo(bdev, &geo);
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if (ret)
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return ret;
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if (copy_to_user((struct hd_geometry __user *)arg, &geo,
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sizeof(geo)))
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return -EFAULT;
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return 0;
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}
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}
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lock_kernel();
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ret = blkdev_locked_ioctl(file, bdev, cmd, arg);
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unlock_kernel();
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if (ret != -ENOIOCTLCMD)
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return ret;
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return blkdev_driver_ioctl(inode, file, disk, cmd, arg);
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}
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/* Most of the generic ioctls are handled in the normal fallback path.
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This assumes the blkdev's low level compat_ioctl always returns
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ENOIOCTLCMD for unknown ioctls. */
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long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
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{
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struct block_device *bdev = file->f_dentry->d_inode->i_bdev;
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struct gendisk *disk = bdev->bd_disk;
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int ret = -ENOIOCTLCMD;
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if (disk->fops->compat_ioctl) {
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lock_kernel();
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ret = disk->fops->compat_ioctl(file, cmd, arg);
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unlock_kernel();
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(blkdev_ioctl);
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