| // SPDX-License-Identifier: GPL-2.0 |
| #include <linux/capability.h> |
| #include <linux/blkdev.h> |
| #include <linux/export.h> |
| #include <linux/gfp.h> |
| #include <linux/blkpg.h> |
| #include <linux/hdreg.h> |
| #include <linux/backing-dev.h> |
| #include <linux/fs.h> |
| #include <linux/blktrace_api.h> |
| #include <linux/pr.h> |
| #include <linux/uaccess.h> |
| |
| static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg) |
| { |
| struct block_device *bdevp; |
| struct gendisk *disk; |
| struct hd_struct *part, *lpart; |
| struct blkpg_ioctl_arg a; |
| struct blkpg_partition p; |
| struct disk_part_iter piter; |
| long long start, length; |
| int partno; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EACCES; |
| if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg))) |
| return -EFAULT; |
| if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition))) |
| return -EFAULT; |
| disk = bdev->bd_disk; |
| if (bdev != bdev->bd_contains) |
| return -EINVAL; |
| partno = p.pno; |
| if (partno <= 0) |
| return -EINVAL; |
| switch (a.op) { |
| case BLKPG_ADD_PARTITION: |
| start = p.start >> 9; |
| length = p.length >> 9; |
| /* check for fit in a hd_struct */ |
| if (sizeof(sector_t) == sizeof(long) && |
| sizeof(long long) > sizeof(long)) { |
| long pstart = start, plength = length; |
| if (pstart != start || plength != length |
| || pstart < 0 || plength < 0 || partno > 65535) |
| return -EINVAL; |
| } |
| /* check if partition is aligned to blocksize */ |
| if (p.start & (bdev_logical_block_size(bdev) - 1)) |
| return -EINVAL; |
| |
| mutex_lock(&bdev->bd_mutex); |
| |
| /* overlap? */ |
| disk_part_iter_init(&piter, disk, |
| DISK_PITER_INCL_EMPTY); |
| while ((part = disk_part_iter_next(&piter))) { |
| if (!(start + length <= part->start_sect || |
| start >= part->start_sect + part->nr_sects)) { |
| disk_part_iter_exit(&piter); |
| mutex_unlock(&bdev->bd_mutex); |
| return -EBUSY; |
| } |
| } |
| disk_part_iter_exit(&piter); |
| |
| /* all seems OK */ |
| part = add_partition(disk, partno, start, length, |
| ADDPART_FLAG_NONE, NULL); |
| mutex_unlock(&bdev->bd_mutex); |
| return PTR_ERR_OR_ZERO(part); |
| case BLKPG_DEL_PARTITION: |
| part = disk_get_part(disk, partno); |
| if (!part) |
| return -ENXIO; |
| |
| bdevp = bdget(part_devt(part)); |
| disk_put_part(part); |
| if (!bdevp) |
| return -ENOMEM; |
| |
| mutex_lock(&bdevp->bd_mutex); |
| if (bdevp->bd_openers) { |
| mutex_unlock(&bdevp->bd_mutex); |
| bdput(bdevp); |
| return -EBUSY; |
| } |
| /* all seems OK */ |
| fsync_bdev(bdevp); |
| invalidate_bdev(bdevp); |
| |
| mutex_lock_nested(&bdev->bd_mutex, 1); |
| delete_partition(disk, partno); |
| mutex_unlock(&bdev->bd_mutex); |
| mutex_unlock(&bdevp->bd_mutex); |
| bdput(bdevp); |
| |
| return 0; |
| case BLKPG_RESIZE_PARTITION: |
| start = p.start >> 9; |
| /* new length of partition in bytes */ |
| length = p.length >> 9; |
| /* check for fit in a hd_struct */ |
| if (sizeof(sector_t) == sizeof(long) && |
| sizeof(long long) > sizeof(long)) { |
| long pstart = start, plength = length; |
| if (pstart != start || plength != length |
| || pstart < 0 || plength < 0) |
| return -EINVAL; |
| } |
| part = disk_get_part(disk, partno); |
| if (!part) |
| return -ENXIO; |
| bdevp = bdget(part_devt(part)); |
| if (!bdevp) { |
| disk_put_part(part); |
| return -ENOMEM; |
| } |
| mutex_lock(&bdevp->bd_mutex); |
| mutex_lock_nested(&bdev->bd_mutex, 1); |
| if (start != part->start_sect) { |
| mutex_unlock(&bdevp->bd_mutex); |
| mutex_unlock(&bdev->bd_mutex); |
| bdput(bdevp); |
| disk_put_part(part); |
| return -EINVAL; |
| } |
| /* overlap? */ |
| disk_part_iter_init(&piter, disk, |
| DISK_PITER_INCL_EMPTY); |
| while ((lpart = disk_part_iter_next(&piter))) { |
| if (lpart->partno != partno && |
| !(start + length <= lpart->start_sect || |
| start >= lpart->start_sect + lpart->nr_sects) |
| ) { |
| disk_part_iter_exit(&piter); |
| mutex_unlock(&bdevp->bd_mutex); |
| mutex_unlock(&bdev->bd_mutex); |
| bdput(bdevp); |
| disk_put_part(part); |
| return -EBUSY; |
| } |
| } |
| disk_part_iter_exit(&piter); |
| part_nr_sects_write(part, (sector_t)length); |
| i_size_write(bdevp->bd_inode, p.length); |
| mutex_unlock(&bdevp->bd_mutex); |
| mutex_unlock(&bdev->bd_mutex); |
| bdput(bdevp); |
| disk_put_part(part); |
| return 0; |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| /* |
| * This is an exported API for the block driver, and will not |
| * acquire bd_mutex. This API should be used in case that |
| * caller has held bd_mutex already. |
| */ |
| int __blkdev_reread_part(struct block_device *bdev) |
| { |
| struct gendisk *disk = bdev->bd_disk; |
| |
| if (!disk_part_scan_enabled(disk) || bdev != bdev->bd_contains) |
| return -EINVAL; |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EACCES; |
| |
| lockdep_assert_held(&bdev->bd_mutex); |
| |
| return rescan_partitions(disk, bdev); |
| } |
| EXPORT_SYMBOL(__blkdev_reread_part); |
| |
| /* |
| * This is an exported API for the block driver, and will |
| * try to acquire bd_mutex. If bd_mutex has been held already |
| * in current context, please call __blkdev_reread_part(). |
| * |
| * Make sure the held locks in current context aren't required |
| * in open()/close() handler and I/O path for avoiding ABBA deadlock: |
| * - bd_mutex is held before calling block driver's open/close |
| * handler |
| * - reading partition table may submit I/O to the block device |
| */ |
| int blkdev_reread_part(struct block_device *bdev) |
| { |
| int res; |
| |
| mutex_lock(&bdev->bd_mutex); |
| res = __blkdev_reread_part(bdev); |
| mutex_unlock(&bdev->bd_mutex); |
| |
| return res; |
| } |
| EXPORT_SYMBOL(blkdev_reread_part); |
| |
| static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode, |
| unsigned long arg, unsigned long flags) |
| { |
| uint64_t range[2]; |
| uint64_t start, len; |
| struct request_queue *q = bdev_get_queue(bdev); |
| struct address_space *mapping = bdev->bd_inode->i_mapping; |
| |
| |
| if (!(mode & FMODE_WRITE)) |
| return -EBADF; |
| |
| if (!blk_queue_discard(q)) |
| return -EOPNOTSUPP; |
| |
| if (copy_from_user(range, (void __user *)arg, sizeof(range))) |
| return -EFAULT; |
| |
| start = range[0]; |
| len = range[1]; |
| |
| if (start & 511) |
| return -EINVAL; |
| if (len & 511) |
| return -EINVAL; |
| |
| if (start + len > i_size_read(bdev->bd_inode)) |
| return -EINVAL; |
| truncate_inode_pages_range(mapping, start, start + len - 1); |
| return blkdev_issue_discard(bdev, start >> 9, len >> 9, |
| GFP_KERNEL, flags); |
| } |
| |
| static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode, |
| unsigned long arg) |
| { |
| uint64_t range[2]; |
| struct address_space *mapping; |
| uint64_t start, end, len; |
| |
| if (!(mode & FMODE_WRITE)) |
| return -EBADF; |
| |
| if (copy_from_user(range, (void __user *)arg, sizeof(range))) |
| return -EFAULT; |
| |
| start = range[0]; |
| len = range[1]; |
| end = start + len - 1; |
| |
| if (start & 511) |
| return -EINVAL; |
| if (len & 511) |
| return -EINVAL; |
| if (end >= (uint64_t)i_size_read(bdev->bd_inode)) |
| return -EINVAL; |
| if (end < start) |
| return -EINVAL; |
| |
| /* Invalidate the page cache, including dirty pages */ |
| mapping = bdev->bd_inode->i_mapping; |
| truncate_inode_pages_range(mapping, start, end); |
| |
| return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL, |
| BLKDEV_ZERO_NOUNMAP); |
| } |
| |
| static int put_ushort(unsigned long arg, unsigned short val) |
| { |
| return put_user(val, (unsigned short __user *)arg); |
| } |
| |
| static int put_int(unsigned long arg, int val) |
| { |
| return put_user(val, (int __user *)arg); |
| } |
| |
| static int put_uint(unsigned long arg, unsigned int val) |
| { |
| return put_user(val, (unsigned int __user *)arg); |
| } |
| |
| static int put_long(unsigned long arg, long val) |
| { |
| return put_user(val, (long __user *)arg); |
| } |
| |
| static int put_ulong(unsigned long arg, unsigned long val) |
| { |
| return put_user(val, (unsigned long __user *)arg); |
| } |
| |
| static int put_u64(unsigned long arg, u64 val) |
| { |
| return put_user(val, (u64 __user *)arg); |
| } |
| |
| int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode, |
| unsigned cmd, unsigned long arg) |
| { |
| struct gendisk *disk = bdev->bd_disk; |
| |
| if (disk->fops->ioctl) |
| return disk->fops->ioctl(bdev, mode, cmd, arg); |
| |
| return -ENOTTY; |
| } |
| /* |
| * For the record: _GPL here is only because somebody decided to slap it |
| * on the previous export. Sheer idiocy, since it wasn't copyrightable |
| * at all and could be open-coded without any exports by anybody who cares. |
| */ |
| EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl); |
| |
| static int blkdev_pr_register(struct block_device *bdev, |
| struct pr_registration __user *arg) |
| { |
| const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; |
| struct pr_registration reg; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| if (!ops || !ops->pr_register) |
| return -EOPNOTSUPP; |
| if (copy_from_user(®, arg, sizeof(reg))) |
| return -EFAULT; |
| |
| if (reg.flags & ~PR_FL_IGNORE_KEY) |
| return -EOPNOTSUPP; |
| return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags); |
| } |
| |
| static int blkdev_pr_reserve(struct block_device *bdev, |
| struct pr_reservation __user *arg) |
| { |
| const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; |
| struct pr_reservation rsv; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| if (!ops || !ops->pr_reserve) |
| return -EOPNOTSUPP; |
| if (copy_from_user(&rsv, arg, sizeof(rsv))) |
| return -EFAULT; |
| |
| if (rsv.flags & ~PR_FL_IGNORE_KEY) |
| return -EOPNOTSUPP; |
| return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags); |
| } |
| |
| static int blkdev_pr_release(struct block_device *bdev, |
| struct pr_reservation __user *arg) |
| { |
| const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; |
| struct pr_reservation rsv; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| if (!ops || !ops->pr_release) |
| return -EOPNOTSUPP; |
| if (copy_from_user(&rsv, arg, sizeof(rsv))) |
| return -EFAULT; |
| |
| if (rsv.flags) |
| return -EOPNOTSUPP; |
| return ops->pr_release(bdev, rsv.key, rsv.type); |
| } |
| |
| static int blkdev_pr_preempt(struct block_device *bdev, |
| struct pr_preempt __user *arg, bool abort) |
| { |
| const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; |
| struct pr_preempt p; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| if (!ops || !ops->pr_preempt) |
| return -EOPNOTSUPP; |
| if (copy_from_user(&p, arg, sizeof(p))) |
| return -EFAULT; |
| |
| if (p.flags) |
| return -EOPNOTSUPP; |
| return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort); |
| } |
| |
| static int blkdev_pr_clear(struct block_device *bdev, |
| struct pr_clear __user *arg) |
| { |
| const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; |
| struct pr_clear c; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| if (!ops || !ops->pr_clear) |
| return -EOPNOTSUPP; |
| if (copy_from_user(&c, arg, sizeof(c))) |
| return -EFAULT; |
| |
| if (c.flags) |
| return -EOPNOTSUPP; |
| return ops->pr_clear(bdev, c.key); |
| } |
| |
| /* |
| * Is it an unrecognized ioctl? The correct returns are either |
| * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a |
| * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl |
| * code before returning. |
| * |
| * Confused drivers sometimes return EINVAL, which is wrong. It |
| * means "I understood the ioctl command, but the parameters to |
| * it were wrong". |
| * |
| * We should aim to just fix the broken drivers, the EINVAL case |
| * should go away. |
| */ |
| static inline int is_unrecognized_ioctl(int ret) |
| { |
| return ret == -EINVAL || |
| ret == -ENOTTY || |
| ret == -ENOIOCTLCMD; |
| } |
| |
| static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode, |
| unsigned cmd, unsigned long arg) |
| { |
| int ret; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EACCES; |
| |
| ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); |
| if (!is_unrecognized_ioctl(ret)) |
| return ret; |
| |
| fsync_bdev(bdev); |
| invalidate_bdev(bdev); |
| return 0; |
| } |
| |
| static int blkdev_roset(struct block_device *bdev, fmode_t mode, |
| unsigned cmd, unsigned long arg) |
| { |
| int ret, n; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EACCES; |
| |
| ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); |
| if (!is_unrecognized_ioctl(ret)) |
| return ret; |
| if (get_user(n, (int __user *)arg)) |
| return -EFAULT; |
| set_device_ro(bdev, n); |
| return 0; |
| } |
| |
| static int blkdev_getgeo(struct block_device *bdev, |
| struct hd_geometry __user *argp) |
| { |
| struct gendisk *disk = bdev->bd_disk; |
| struct hd_geometry geo; |
| int ret; |
| |
| if (!argp) |
| return -EINVAL; |
| if (!disk->fops->getgeo) |
| return -ENOTTY; |
| |
| /* |
| * We need to set the startsect first, the driver may |
| * want to override it. |
| */ |
| memset(&geo, 0, sizeof(geo)); |
| geo.start = get_start_sect(bdev); |
| ret = disk->fops->getgeo(bdev, &geo); |
| if (ret) |
| return ret; |
| if (copy_to_user(argp, &geo, sizeof(geo))) |
| return -EFAULT; |
| return 0; |
| } |
| |
| /* set the logical block size */ |
| static int blkdev_bszset(struct block_device *bdev, fmode_t mode, |
| int __user *argp) |
| { |
| int ret, n; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EACCES; |
| if (!argp) |
| return -EINVAL; |
| if (get_user(n, argp)) |
| return -EFAULT; |
| |
| if (!(mode & FMODE_EXCL)) { |
| bdgrab(bdev); |
| if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0) |
| return -EBUSY; |
| } |
| |
| ret = set_blocksize(bdev, n); |
| if (!(mode & FMODE_EXCL)) |
| blkdev_put(bdev, mode | FMODE_EXCL); |
| return ret; |
| } |
| |
| /* |
| * always keep this in sync with compat_blkdev_ioctl() |
| */ |
| int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, |
| unsigned long arg) |
| { |
| void __user *argp = (void __user *)arg; |
| loff_t size; |
| unsigned int max_sectors; |
| |
| switch (cmd) { |
| case BLKFLSBUF: |
| return blkdev_flushbuf(bdev, mode, cmd, arg); |
| case BLKROSET: |
| return blkdev_roset(bdev, mode, cmd, arg); |
| case BLKDISCARD: |
| return blk_ioctl_discard(bdev, mode, arg, 0); |
| case BLKSECDISCARD: |
| return blk_ioctl_discard(bdev, mode, arg, |
| BLKDEV_DISCARD_SECURE); |
| case BLKZEROOUT: |
| return blk_ioctl_zeroout(bdev, mode, arg); |
| case BLKREPORTZONE: |
| return blkdev_report_zones_ioctl(bdev, mode, cmd, arg); |
| case BLKRESETZONE: |
| case BLKOPENZONE: |
| case BLKCLOSEZONE: |
| case BLKFINISHZONE: |
| return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg); |
| case BLKGETZONESZ: |
| return put_uint(arg, bdev_zone_sectors(bdev)); |
| case BLKGETNRZONES: |
| return put_uint(arg, blkdev_nr_zones(bdev->bd_disk)); |
| case HDIO_GETGEO: |
| return blkdev_getgeo(bdev, argp); |
| case BLKRAGET: |
| case BLKFRAGET: |
| if (!arg) |
| return -EINVAL; |
| return put_long(arg, (bdev->bd_bdi->ra_pages*PAGE_SIZE) / 512); |
| case BLKROGET: |
| return put_int(arg, bdev_read_only(bdev) != 0); |
| case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */ |
| return put_int(arg, block_size(bdev)); |
| case BLKSSZGET: /* get block device logical block size */ |
| return put_int(arg, bdev_logical_block_size(bdev)); |
| case BLKPBSZGET: /* get block device physical block size */ |
| return put_uint(arg, bdev_physical_block_size(bdev)); |
| case BLKIOMIN: |
| return put_uint(arg, bdev_io_min(bdev)); |
| case BLKIOOPT: |
| return put_uint(arg, bdev_io_opt(bdev)); |
| case BLKALIGNOFF: |
| return put_int(arg, bdev_alignment_offset(bdev)); |
| case BLKDISCARDZEROES: |
| return put_uint(arg, 0); |
| case BLKSECTGET: |
| max_sectors = min_t(unsigned int, USHRT_MAX, |
| queue_max_sectors(bdev_get_queue(bdev))); |
| return put_ushort(arg, max_sectors); |
| case BLKROTATIONAL: |
| return put_ushort(arg, !blk_queue_nonrot(bdev_get_queue(bdev))); |
| case BLKRASET: |
| case BLKFRASET: |
| if(!capable(CAP_SYS_ADMIN)) |
| return -EACCES; |
| bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE; |
| return 0; |
| case BLKBSZSET: |
| return blkdev_bszset(bdev, mode, argp); |
| case BLKPG: |
| return blkpg_ioctl(bdev, argp); |
| case BLKRRPART: |
| return blkdev_reread_part(bdev); |
| case BLKGETSIZE: |
| size = i_size_read(bdev->bd_inode); |
| if ((size >> 9) > ~0UL) |
| return -EFBIG; |
| return put_ulong(arg, size >> 9); |
| case BLKGETSIZE64: |
| return put_u64(arg, i_size_read(bdev->bd_inode)); |
| case BLKTRACESTART: |
| case BLKTRACESTOP: |
| case BLKTRACESETUP: |
| case BLKTRACETEARDOWN: |
| return blk_trace_ioctl(bdev, cmd, argp); |
| case IOC_PR_REGISTER: |
| return blkdev_pr_register(bdev, argp); |
| case IOC_PR_RESERVE: |
| return blkdev_pr_reserve(bdev, argp); |
| case IOC_PR_RELEASE: |
| 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 __blkdev_driver_ioctl(bdev, mode, cmd, arg); |
| } |
| } |
| EXPORT_SYMBOL_GPL(blkdev_ioctl); |