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661 lines
16 KiB
661 lines
16 KiB
// 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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|
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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 gendisk *disk = bdev->bd_disk; |
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struct blkpg_partition p; |
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long long start, length; |
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|
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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(disk, 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(disk, p.pno, start, length); |
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case BLKPG_RESIZE_PARTITION: |
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return bdev_resize_partition(disk, 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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|
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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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|
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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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|
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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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if (bdev->bd_disk->open_partitions) |
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return -EBUSY; |
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|
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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 BLKGETDISKSEQ: |
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return put_u64(argp, bdev->bd_disk->diskseq); |
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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_disk->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); |
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case IOC_PR_PREEMPT: |
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return blkdev_pr_preempt(bdev, argp, false); |
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case IOC_PR_PREEMPT_ABORT: |
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return blkdev_pr_preempt(bdev, argp, true); |
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case IOC_PR_CLEAR: |
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return blkdev_pr_clear(bdev, argp); |
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default: |
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return -ENOIOCTLCMD; |
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} |
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} |
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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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* to handle all incompatible commands in both functions. |
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* |
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* New commands must be compatible and go into blkdev_common_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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int ret; |
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loff_t size; |
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void __user *argp = (void __user *)arg; |
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|
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switch (cmd) { |
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/* These need separate implementations for the data structure */ |
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case HDIO_GETGEO: |
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return blkdev_getgeo(bdev, argp); |
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case BLKPG: |
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return blkpg_ioctl(bdev, argp); |
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|
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/* Compat mode returns 32-bit data instead of 'long' */ |
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case BLKRAGET: |
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case BLKFRAGET: |
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if (!argp) |
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return -EINVAL; |
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return put_long(argp, |
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(bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512); |
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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(argp, size >> 9); |
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|
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/* The data is compatible, but the command number is different */ |
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case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */ |
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return put_int(argp, block_size(bdev)); |
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case BLKBSZSET: |
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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_disk->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
|
|
|