122 lines
3.4 KiB
C
122 lines
3.4 KiB
C
#include <linux/blkdev.h>
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#include <linux/blkpg.h>
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#include <linux/blktrace_api.h>
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#include <linux/cdrom.h>
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#include <linux/compat.h>
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#include <linux/elevator.h>
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#include <linux/fd.h>
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#include <linux/hdreg.h>
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#include <linux/syscalls.h>
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#include <linux/smp_lock.h>
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#include <linux/types.h>
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#include <linux/uaccess.h>
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static int compat_put_ushort(unsigned long arg, unsigned short val)
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{
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return put_user(val, (unsigned short __user *)compat_ptr(arg));
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}
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static int compat_put_int(unsigned long arg, int val)
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{
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return put_user(val, (compat_int_t __user *)compat_ptr(arg));
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}
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static int compat_put_long(unsigned long arg, long val)
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{
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return put_user(val, (compat_long_t __user *)compat_ptr(arg));
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}
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static int compat_put_ulong(unsigned long arg, compat_ulong_t val)
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{
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return put_user(val, (compat_ulong_t __user *)compat_ptr(arg));
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}
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static int compat_put_u64(unsigned long arg, u64 val)
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{
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return put_user(val, (compat_u64 __user *)compat_ptr(arg));
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}
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#define BLKBSZGET_32 _IOR(0x12, 112, int)
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#define BLKBSZSET_32 _IOW(0x12, 113, int)
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#define BLKGETSIZE64_32 _IOR(0x12, 114, int)
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static int compat_blkdev_locked_ioctl(struct inode *inode, struct file *file,
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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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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 compat_put_long(arg,
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(bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
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case BLKROGET: /* compatible */
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return compat_put_int(arg, bdev_read_only(bdev) != 0);
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case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
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return compat_put_int(arg, block_size(bdev));
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case BLKSSZGET: /* get block device hardware sector size */
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return compat_put_int(arg, bdev_hardsect_size(bdev));
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case BLKSECTGET:
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return compat_put_ushort(arg,
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bdev_get_queue(bdev)->max_sectors);
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case BLKRASET: /* compatible, but no compat_ptr (!) */
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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 BLKGETSIZE:
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if ((bdev->bd_inode->i_size >> 9) > ~0UL)
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return -EFBIG;
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return compat_put_ulong(arg, bdev->bd_inode->i_size >> 9);
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case BLKGETSIZE64_32:
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return compat_put_u64(arg, bdev->bd_inode->i_size);
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}
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return -ENOIOCTLCMD;
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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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int ret = -ENOIOCTLCMD;
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struct inode *inode = file->f_mapping->host;
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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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switch (cmd) {
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case BLKFLSBUF:
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case BLKROSET:
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/*
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* the ones below are implemented in blkdev_locked_ioctl,
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* but we call blkdev_ioctl, which gets the lock for us
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*/
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case BLKRRPART:
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return blkdev_ioctl(inode, file, cmd,
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(unsigned long)compat_ptr(arg));
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case BLKBSZSET_32:
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return blkdev_ioctl(inode, file, BLKBSZSET,
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(unsigned long)compat_ptr(arg));
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}
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lock_kernel();
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ret = compat_blkdev_locked_ioctl(inode, file, bdev, cmd, arg);
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/* FIXME: why do we assume -> compat_ioctl needs the BKL? */
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if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
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ret = disk->fops->compat_ioctl(file, cmd, arg);
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unlock_kernel();
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return ret;
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}
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