656 lines
16 KiB
C
656 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/capability.h>
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#include <linux/compat.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 <linux/pr.h>
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#include <linux/uaccess.h>
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#include "blk.h"
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static int blkpg_do_ioctl(struct block_device *bdev,
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struct blkpg_partition __user *upart, int op)
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{
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struct blkpg_partition p;
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long long start, length;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))
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return -EFAULT;
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if (bdev_is_partition(bdev))
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return -EINVAL;
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if (p.pno <= 0)
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return -EINVAL;
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if (op == BLKPG_DEL_PARTITION)
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return bdev_del_partition(bdev, p.pno);
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start = p.start >> SECTOR_SHIFT;
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length = p.length >> SECTOR_SHIFT;
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switch (op) {
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case BLKPG_ADD_PARTITION:
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/* check if partition is aligned to blocksize */
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if (p.start & (bdev_logical_block_size(bdev) - 1))
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return -EINVAL;
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return bdev_add_partition(bdev, p.pno, start, length);
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case BLKPG_RESIZE_PARTITION:
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return bdev_resize_partition(bdev, p.pno, start, length);
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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 blkpg_ioctl(struct block_device *bdev,
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struct blkpg_ioctl_arg __user *arg)
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{
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struct blkpg_partition __user *udata;
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int op;
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if (get_user(op, &arg->op) || get_user(udata, &arg->data))
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return -EFAULT;
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return blkpg_do_ioctl(bdev, udata, op);
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}
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#ifdef CONFIG_COMPAT
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struct compat_blkpg_ioctl_arg {
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compat_int_t op;
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compat_int_t flags;
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compat_int_t datalen;
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compat_caddr_t data;
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};
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static int compat_blkpg_ioctl(struct block_device *bdev,
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struct compat_blkpg_ioctl_arg __user *arg)
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{
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compat_caddr_t udata;
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int op;
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if (get_user(op, &arg->op) || get_user(udata, &arg->data))
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return -EFAULT;
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return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
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}
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#endif
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static int blkdev_reread_part(struct block_device *bdev, fmode_t mode)
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{
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struct block_device *tmp;
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if (!disk_part_scan_enabled(bdev->bd_disk) || bdev_is_partition(bdev))
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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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/*
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* Reopen the device to revalidate the driver state and force a
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* partition rescan.
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*/
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mode &= ~FMODE_EXCL;
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set_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state);
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tmp = blkdev_get_by_dev(bdev->bd_dev, mode, NULL);
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if (IS_ERR(tmp))
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return PTR_ERR(tmp);
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blkdev_put(tmp, mode);
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return 0;
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}
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static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
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unsigned long arg, unsigned long flags)
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{
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uint64_t range[2];
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uint64_t start, len;
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struct request_queue *q = bdev_get_queue(bdev);
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int err;
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if (!(mode & FMODE_WRITE))
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return -EBADF;
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if (!blk_queue_discard(q))
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return -EOPNOTSUPP;
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if (copy_from_user(range, (void __user *)arg, sizeof(range)))
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return -EFAULT;
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start = range[0];
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len = range[1];
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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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if (start + len > i_size_read(bdev->bd_inode))
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return -EINVAL;
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err = truncate_bdev_range(bdev, mode, start, start + len - 1);
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if (err)
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return err;
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return blkdev_issue_discard(bdev, start >> 9, len >> 9,
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GFP_KERNEL, flags);
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}
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static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
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unsigned long arg)
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{
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uint64_t range[2];
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uint64_t start, end, len;
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int err;
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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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start = range[0];
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len = range[1];
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end = start + len - 1;
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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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if (end >= (uint64_t)i_size_read(bdev->bd_inode))
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return -EINVAL;
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if (end < start)
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return -EINVAL;
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/* Invalidate the page cache, including dirty pages */
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err = truncate_bdev_range(bdev, mode, start, end);
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if (err)
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return err;
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return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
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BLKDEV_ZERO_NOUNMAP);
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}
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static int put_ushort(unsigned short __user *argp, unsigned short val)
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{
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return put_user(val, argp);
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}
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static int put_int(int __user *argp, int val)
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{
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return put_user(val, argp);
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}
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static int put_uint(unsigned int __user *argp, unsigned int val)
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{
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return put_user(val, argp);
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}
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static int put_long(long __user *argp, long val)
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{
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return put_user(val, argp);
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}
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static int put_ulong(unsigned long __user *argp, unsigned long val)
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{
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return put_user(val, argp);
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}
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static int put_u64(u64 __user *argp, u64 val)
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{
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return put_user(val, argp);
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}
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#ifdef CONFIG_COMPAT
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static int compat_put_long(compat_long_t __user *argp, long val)
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{
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return put_user(val, argp);
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}
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static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
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{
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return put_user(val, argp);
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}
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#endif
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#ifdef CONFIG_COMPAT
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/*
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* This is the equivalent of compat_ptr_ioctl(), to be used by block
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* drivers that implement only commands that are completely compatible
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* between 32-bit and 64-bit user space
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*/
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int blkdev_compat_ptr_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,
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(unsigned long)compat_ptr(arg));
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return -ENOIOCTLCMD;
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}
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EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
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#endif
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static int blkdev_pr_register(struct block_device *bdev,
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struct pr_registration __user *arg)
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{
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const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
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struct pr_registration reg;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (!ops || !ops->pr_register)
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return -EOPNOTSUPP;
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if (copy_from_user(®, arg, sizeof(reg)))
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return -EFAULT;
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if (reg.flags & ~PR_FL_IGNORE_KEY)
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return -EOPNOTSUPP;
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return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
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}
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static int blkdev_pr_reserve(struct block_device *bdev,
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struct pr_reservation __user *arg)
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{
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const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
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struct pr_reservation rsv;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (!ops || !ops->pr_reserve)
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return -EOPNOTSUPP;
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if (copy_from_user(&rsv, arg, sizeof(rsv)))
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return -EFAULT;
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if (rsv.flags & ~PR_FL_IGNORE_KEY)
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return -EOPNOTSUPP;
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return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
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}
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static int blkdev_pr_release(struct block_device *bdev,
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struct pr_reservation __user *arg)
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{
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const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
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struct pr_reservation rsv;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (!ops || !ops->pr_release)
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return -EOPNOTSUPP;
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if (copy_from_user(&rsv, arg, sizeof(rsv)))
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return -EFAULT;
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if (rsv.flags)
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return -EOPNOTSUPP;
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return ops->pr_release(bdev, rsv.key, rsv.type);
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}
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static int blkdev_pr_preempt(struct block_device *bdev,
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struct pr_preempt __user *arg, bool abort)
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{
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const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
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struct pr_preempt p;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (!ops || !ops->pr_preempt)
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return -EOPNOTSUPP;
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if (copy_from_user(&p, arg, sizeof(p)))
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return -EFAULT;
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if (p.flags)
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return -EOPNOTSUPP;
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return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
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}
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static int blkdev_pr_clear(struct block_device *bdev,
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struct pr_clear __user *arg)
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{
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const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
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struct pr_clear c;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (!ops || !ops->pr_clear)
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return -EOPNOTSUPP;
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if (copy_from_user(&c, arg, sizeof(c)))
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return -EFAULT;
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if (c.flags)
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return -EOPNOTSUPP;
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return ops->pr_clear(bdev, c.key);
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}
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static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode,
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unsigned cmd, unsigned long arg)
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{
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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fsync_bdev(bdev);
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invalidate_bdev(bdev);
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return 0;
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}
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static int blkdev_roset(struct block_device *bdev, fmode_t mode,
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unsigned cmd, unsigned long arg)
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{
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int ret, n;
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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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if (bdev->bd_disk->fops->set_read_only) {
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ret = bdev->bd_disk->fops->set_read_only(bdev, n);
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if (ret)
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return ret;
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}
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bdev->bd_read_only = n;
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return 0;
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}
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static int blkdev_getgeo(struct block_device *bdev,
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struct hd_geometry __user *argp)
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{
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struct gendisk *disk = bdev->bd_disk;
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struct hd_geometry geo;
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int ret;
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if (!argp)
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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(argp, &geo, sizeof(geo)))
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return -EFAULT;
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return 0;
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}
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#ifdef CONFIG_COMPAT
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struct compat_hd_geometry {
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unsigned char heads;
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unsigned char sectors;
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unsigned short cylinders;
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u32 start;
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};
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static int compat_hdio_getgeo(struct block_device *bdev,
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struct compat_hd_geometry __user *ugeo)
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{
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struct gendisk *disk = bdev->bd_disk;
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struct hd_geometry geo;
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int ret;
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if (!ugeo)
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return -EINVAL;
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if (!disk->fops->getgeo)
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return -ENOTTY;
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memset(&geo, 0, sizeof(geo));
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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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ret = copy_to_user(ugeo, &geo, 4);
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ret |= put_user(geo.start, &ugeo->start);
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if (ret)
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ret = -EFAULT;
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return ret;
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}
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#endif
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/* set the logical block size */
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static int blkdev_bszset(struct block_device *bdev, fmode_t mode,
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int __user *argp)
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{
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int ret, n;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (!argp)
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return -EINVAL;
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if (get_user(n, argp))
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return -EFAULT;
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if (mode & FMODE_EXCL)
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return set_blocksize(bdev, n);
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if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode | FMODE_EXCL, &bdev)))
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return -EBUSY;
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ret = set_blocksize(bdev, n);
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blkdev_put(bdev, mode | FMODE_EXCL);
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return ret;
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}
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/*
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* Common commands that are handled the same way on native and compat
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* user space. Note the separate arg/argp parameters that are needed
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* to deal with the compat_ptr() conversion.
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*/
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static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned cmd, unsigned long arg, void __user *argp)
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{
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unsigned int max_sectors;
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switch (cmd) {
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case BLKFLSBUF:
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return blkdev_flushbuf(bdev, mode, cmd, arg);
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case BLKROSET:
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return blkdev_roset(bdev, mode, cmd, arg);
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case BLKDISCARD:
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return blk_ioctl_discard(bdev, mode, arg, 0);
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case BLKSECDISCARD:
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return blk_ioctl_discard(bdev, mode, arg,
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BLKDEV_DISCARD_SECURE);
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case BLKZEROOUT:
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return blk_ioctl_zeroout(bdev, mode, arg);
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case BLKREPORTZONE:
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return blkdev_report_zones_ioctl(bdev, mode, cmd, arg);
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case BLKRESETZONE:
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case BLKOPENZONE:
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case BLKCLOSEZONE:
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case BLKFINISHZONE:
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return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
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case BLKGETZONESZ:
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return put_uint(argp, bdev_zone_sectors(bdev));
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case BLKGETNRZONES:
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return put_uint(argp, blkdev_nr_zones(bdev->bd_disk));
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case BLKROGET:
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return put_int(argp, bdev_read_only(bdev) != 0);
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case BLKSSZGET: /* get block device logical block size */
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return put_int(argp, bdev_logical_block_size(bdev));
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case BLKPBSZGET: /* get block device physical block size */
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return put_uint(argp, bdev_physical_block_size(bdev));
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case BLKIOMIN:
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return put_uint(argp, bdev_io_min(bdev));
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case BLKIOOPT:
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return put_uint(argp, bdev_io_opt(bdev));
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case BLKALIGNOFF:
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return put_int(argp, bdev_alignment_offset(bdev));
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case BLKDISCARDZEROES:
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return put_uint(argp, 0);
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case BLKSECTGET:
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max_sectors = min_t(unsigned int, USHRT_MAX,
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queue_max_sectors(bdev_get_queue(bdev)));
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return put_ushort(argp, max_sectors);
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case BLKROTATIONAL:
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return put_ushort(argp, !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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bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE;
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return 0;
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case BLKRRPART:
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return blkdev_reread_part(bdev, mode);
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case BLKTRACESTART:
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case BLKTRACESTOP:
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case BLKTRACETEARDOWN:
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return blk_trace_ioctl(bdev, cmd, argp);
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case IOC_PR_REGISTER:
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return blkdev_pr_register(bdev, argp);
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case IOC_PR_RESERVE:
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return blkdev_pr_reserve(bdev, argp);
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case IOC_PR_RELEASE:
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return blkdev_pr_release(bdev, argp);
|
|
case IOC_PR_PREEMPT:
|
|
return blkdev_pr_preempt(bdev, argp, false);
|
|
case IOC_PR_PREEMPT_ABORT:
|
|
return blkdev_pr_preempt(bdev, argp, true);
|
|
case IOC_PR_CLEAR:
|
|
return blkdev_pr_clear(bdev, argp);
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Always keep this in sync with compat_blkdev_ioctl()
|
|
* to handle all incompatible commands in both functions.
|
|
*
|
|
* New commands must be compatible and go into blkdev_common_ioctl
|
|
*/
|
|
int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
|
|
unsigned long arg)
|
|
{
|
|
int ret;
|
|
loff_t size;
|
|
void __user *argp = (void __user *)arg;
|
|
|
|
switch (cmd) {
|
|
/* These need separate implementations for the data structure */
|
|
case HDIO_GETGEO:
|
|
return blkdev_getgeo(bdev, argp);
|
|
case BLKPG:
|
|
return blkpg_ioctl(bdev, argp);
|
|
|
|
/* Compat mode returns 32-bit data instead of 'long' */
|
|
case BLKRAGET:
|
|
case BLKFRAGET:
|
|
if (!argp)
|
|
return -EINVAL;
|
|
return put_long(argp, (bdev->bd_bdi->ra_pages*PAGE_SIZE) / 512);
|
|
case BLKGETSIZE:
|
|
size = i_size_read(bdev->bd_inode);
|
|
if ((size >> 9) > ~0UL)
|
|
return -EFBIG;
|
|
return put_ulong(argp, size >> 9);
|
|
|
|
/* The data is compatible, but the command number is different */
|
|
case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
|
|
return put_int(argp, block_size(bdev));
|
|
case BLKBSZSET:
|
|
return blkdev_bszset(bdev, mode, argp);
|
|
case BLKGETSIZE64:
|
|
return put_u64(argp, i_size_read(bdev->bd_inode));
|
|
|
|
/* Incompatible alignment on i386 */
|
|
case BLKTRACESETUP:
|
|
return blk_trace_ioctl(bdev, cmd, argp);
|
|
default:
|
|
break;
|
|
}
|
|
|
|
ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
|
|
if (ret != -ENOIOCTLCMD)
|
|
return ret;
|
|
|
|
if (!bdev->bd_disk->fops->ioctl)
|
|
return -ENOTTY;
|
|
return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
|
|
}
|
|
EXPORT_SYMBOL_GPL(blkdev_ioctl); /* for /dev/raw */
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
#define BLKBSZGET_32 _IOR(0x12, 112, int)
|
|
#define BLKBSZSET_32 _IOW(0x12, 113, int)
|
|
#define BLKGETSIZE64_32 _IOR(0x12, 114, int)
|
|
|
|
/* Most of the generic ioctls are handled in the normal fallback path.
|
|
This assumes the blkdev's low level compat_ioctl always returns
|
|
ENOIOCTLCMD for unknown ioctls. */
|
|
long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
|
|
{
|
|
int ret;
|
|
void __user *argp = compat_ptr(arg);
|
|
struct block_device *bdev = I_BDEV(file->f_mapping->host);
|
|
struct gendisk *disk = bdev->bd_disk;
|
|
fmode_t mode = file->f_mode;
|
|
loff_t size;
|
|
|
|
/*
|
|
* O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
|
|
* to updated it before every ioctl.
|
|
*/
|
|
if (file->f_flags & O_NDELAY)
|
|
mode |= FMODE_NDELAY;
|
|
else
|
|
mode &= ~FMODE_NDELAY;
|
|
|
|
switch (cmd) {
|
|
/* These need separate implementations for the data structure */
|
|
case HDIO_GETGEO:
|
|
return compat_hdio_getgeo(bdev, argp);
|
|
case BLKPG:
|
|
return compat_blkpg_ioctl(bdev, argp);
|
|
|
|
/* Compat mode returns 32-bit data instead of 'long' */
|
|
case BLKRAGET:
|
|
case BLKFRAGET:
|
|
if (!argp)
|
|
return -EINVAL;
|
|
return compat_put_long(argp,
|
|
(bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512);
|
|
case BLKGETSIZE:
|
|
size = i_size_read(bdev->bd_inode);
|
|
if ((size >> 9) > ~0UL)
|
|
return -EFBIG;
|
|
return compat_put_ulong(argp, size >> 9);
|
|
|
|
/* The data is compatible, but the command number is different */
|
|
case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
|
|
return put_int(argp, bdev_logical_block_size(bdev));
|
|
case BLKBSZSET_32:
|
|
return blkdev_bszset(bdev, mode, argp);
|
|
case BLKGETSIZE64_32:
|
|
return put_u64(argp, i_size_read(bdev->bd_inode));
|
|
|
|
/* Incompatible alignment on i386 */
|
|
case BLKTRACESETUP32:
|
|
return blk_trace_ioctl(bdev, cmd, argp);
|
|
default:
|
|
break;
|
|
}
|
|
|
|
ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
|
|
if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
|
|
ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
|
|
|
|
return ret;
|
|
}
|
|
#endif
|