352 lines
8.7 KiB
C
352 lines
8.7 KiB
C
#include <linux/capability.h>
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#include <linux/blkdev.h>
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#include <linux/export.h>
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#include <linux/gfp.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/fs.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 hd_struct *part;
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struct blkpg_ioctl_arg a;
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struct blkpg_partition p;
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struct disk_part_iter piter;
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long long start, length;
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int partno;
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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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partno = p.pno;
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if (partno <= 0)
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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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mutex_lock(&bdev->bd_mutex);
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/* overlap? */
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disk_part_iter_init(&piter, disk,
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DISK_PITER_INCL_EMPTY);
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while ((part = disk_part_iter_next(&piter))) {
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if (!(start + length <= part->start_sect ||
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start >= part->start_sect + part->nr_sects)) {
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disk_part_iter_exit(&piter);
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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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disk_part_iter_exit(&piter);
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/* all seems OK */
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part = add_partition(disk, partno, start, length,
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ADDPART_FLAG_NONE, NULL);
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mutex_unlock(&bdev->bd_mutex);
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return IS_ERR(part) ? PTR_ERR(part) : 0;
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case BLKPG_DEL_PARTITION:
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part = disk_get_part(disk, partno);
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if (!part)
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return -ENXIO;
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bdevp = bdget(part_devt(part));
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disk_put_part(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);
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mutex_lock_nested(&bdev->bd_mutex, 1);
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delete_partition(disk, partno);
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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_part_scan_enabled(disk) || 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 blk_ioctl_discard(struct block_device *bdev, uint64_t start,
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uint64_t len, int secure)
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{
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unsigned long flags = 0;
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if (start & 511)
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return -EINVAL;
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if (len & 511)
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return -EINVAL;
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start >>= 9;
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len >>= 9;
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if (start + len > (i_size_read(bdev->bd_inode) >> 9))
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return -EINVAL;
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if (secure)
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flags |= BLKDEV_DISCARD_SECURE;
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return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags);
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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_uint(unsigned long arg, unsigned int val)
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{
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return put_user(val, (unsigned 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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int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned cmd, unsigned long arg)
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{
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struct gendisk *disk = bdev->bd_disk;
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if (disk->fops->ioctl)
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return disk->fops->ioctl(bdev, mode, cmd, arg);
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return -ENOTTY;
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}
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/*
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* For the record: _GPL here is only because somebody decided to slap it
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* on the previous export. Sheer idiocy, since it wasn't copyrightable
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* at all and could be open-coded without any exports by anybody who cares.
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*/
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EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
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/*
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* Is it an unrecognized ioctl? The correct returns are either
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* ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a
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* fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl
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* code before returning.
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*
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* Confused drivers sometimes return EINVAL, which is wrong. It
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* means "I understood the ioctl command, but the parameters to
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* it were wrong".
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*
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* We should aim to just fix the broken drivers, the EINVAL case
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* should go away.
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*/
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static inline int is_unrecognized_ioctl(int ret)
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{
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return ret == -EINVAL ||
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ret == -ENOTTY ||
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ret == -ENOIOCTLCMD;
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}
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/*
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* always keep this in sync with compat_blkdev_ioctl()
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*/
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int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
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unsigned long arg)
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{
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struct gendisk *disk = bdev->bd_disk;
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struct backing_dev_info *bdi;
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loff_t size;
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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(bdev, mode, cmd, arg);
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if (!is_unrecognized_ioctl(ret))
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return ret;
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fsync_bdev(bdev);
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invalidate_bdev(bdev);
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return 0;
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case BLKROSET:
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ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
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if (!is_unrecognized_ioctl(ret))
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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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set_device_ro(bdev, n);
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return 0;
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case BLKDISCARD:
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case BLKSECDISCARD: {
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uint64_t range[2];
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if (!(mode & FMODE_WRITE))
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return -EBADF;
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if (copy_from_user(range, (void __user *)arg, sizeof(range)))
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return -EFAULT;
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return blk_ioctl_discard(bdev, range[0], range[1],
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cmd == BLKSECDISCARD);
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}
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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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memset(&geo, 0, sizeof(geo));
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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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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 block device soft block size (cf. BLKSSZGET) */
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return put_int(arg, block_size(bdev));
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case BLKSSZGET: /* get block device logical block size */
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return put_int(arg, bdev_logical_block_size(bdev));
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case BLKPBSZGET: /* get block device physical block size */
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return put_uint(arg, bdev_physical_block_size(bdev));
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case BLKIOMIN:
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return put_uint(arg, bdev_io_min(bdev));
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case BLKIOOPT:
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return put_uint(arg, bdev_io_opt(bdev));
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case BLKALIGNOFF:
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return put_int(arg, bdev_alignment_offset(bdev));
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case BLKDISCARDZEROES:
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return put_uint(arg, bdev_discard_zeroes_data(bdev));
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case BLKSECTGET:
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return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
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case BLKROTATIONAL:
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return put_ushort(arg, !blk_queue_nonrot(bdev_get_queue(bdev)));
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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 (!(mode & FMODE_EXCL)) {
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bdgrab(bdev);
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if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0)
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return -EBUSY;
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}
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ret = set_blocksize(bdev, n);
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if (!(mode & FMODE_EXCL))
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blkdev_put(bdev, mode | FMODE_EXCL);
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return ret;
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case BLKPG:
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ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
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break;
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case BLKRRPART:
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ret = blkdev_reread_part(bdev);
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break;
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case BLKGETSIZE:
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size = i_size_read(bdev->bd_inode);
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if ((size >> 9) > ~0UL)
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return -EFBIG;
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return put_ulong(arg, size >> 9);
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case BLKGETSIZE64:
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return put_u64(arg, i_size_read(bdev->bd_inode));
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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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ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
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break;
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default:
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ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
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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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