summaryrefslogtreecommitdiffstats
path: root/block/ioctl.c
diff options
context:
space:
mode:
Diffstat (limited to 'block/ioctl.c')
-rw-r--r--block/ioctl.c691
1 files changed, 691 insertions, 0 deletions
diff --git a/block/ioctl.c b/block/ioctl.c
new file mode 100644
index 0000000000..d1d8e83912
--- /dev/null
+++ b/block/ioctl.c
@@ -0,0 +1,691 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/capability.h>
+#include <linux/compat.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>
+#include "blk.h"
+
+static int blkpg_do_ioctl(struct block_device *bdev,
+ struct blkpg_partition __user *upart, int op)
+{
+ struct gendisk *disk = bdev->bd_disk;
+ struct blkpg_partition p;
+ sector_t start, length;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+ if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))
+ return -EFAULT;
+ if (bdev_is_partition(bdev))
+ return -EINVAL;
+
+ if (p.pno <= 0)
+ return -EINVAL;
+
+ if (op == BLKPG_DEL_PARTITION)
+ return bdev_del_partition(disk, p.pno);
+
+ if (p.start < 0 || p.length <= 0 || p.start + p.length < 0)
+ return -EINVAL;
+ /* Check that the partition is aligned to the block size */
+ if (!IS_ALIGNED(p.start | p.length, bdev_logical_block_size(bdev)))
+ return -EINVAL;
+
+ start = p.start >> SECTOR_SHIFT;
+ length = p.length >> SECTOR_SHIFT;
+
+ switch (op) {
+ case BLKPG_ADD_PARTITION:
+ return bdev_add_partition(disk, p.pno, start, length);
+ case BLKPG_RESIZE_PARTITION:
+ return bdev_resize_partition(disk, p.pno, start, length);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int blkpg_ioctl(struct block_device *bdev,
+ struct blkpg_ioctl_arg __user *arg)
+{
+ struct blkpg_partition __user *udata;
+ int op;
+
+ if (get_user(op, &arg->op) || get_user(udata, &arg->data))
+ return -EFAULT;
+
+ return blkpg_do_ioctl(bdev, udata, op);
+}
+
+#ifdef CONFIG_COMPAT
+struct compat_blkpg_ioctl_arg {
+ compat_int_t op;
+ compat_int_t flags;
+ compat_int_t datalen;
+ compat_caddr_t data;
+};
+
+static int compat_blkpg_ioctl(struct block_device *bdev,
+ struct compat_blkpg_ioctl_arg __user *arg)
+{
+ compat_caddr_t udata;
+ int op;
+
+ if (get_user(op, &arg->op) || get_user(udata, &arg->data))
+ return -EFAULT;
+
+ return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
+}
+#endif
+
+static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode,
+ unsigned long arg)
+{
+ uint64_t range[2];
+ uint64_t start, len;
+ struct inode *inode = bdev->bd_inode;
+ int err;
+
+ if (!(mode & BLK_OPEN_WRITE))
+ return -EBADF;
+
+ if (!bdev_max_discard_sectors(bdev))
+ 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 > bdev_nr_bytes(bdev))
+ return -EINVAL;
+
+ filemap_invalidate_lock(inode->i_mapping);
+ err = truncate_bdev_range(bdev, mode, start, start + len - 1);
+ if (err)
+ goto fail;
+ err = blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL);
+fail:
+ filemap_invalidate_unlock(inode->i_mapping);
+ return err;
+}
+
+static int blk_ioctl_secure_erase(struct block_device *bdev, blk_mode_t mode,
+ void __user *argp)
+{
+ uint64_t start, len;
+ uint64_t range[2];
+ int err;
+
+ if (!(mode & BLK_OPEN_WRITE))
+ return -EBADF;
+ if (!bdev_max_secure_erase_sectors(bdev))
+ return -EOPNOTSUPP;
+ if (copy_from_user(range, argp, sizeof(range)))
+ return -EFAULT;
+
+ start = range[0];
+ len = range[1];
+ if ((start & 511) || (len & 511))
+ return -EINVAL;
+ if (start + len > bdev_nr_bytes(bdev))
+ return -EINVAL;
+
+ filemap_invalidate_lock(bdev->bd_inode->i_mapping);
+ err = truncate_bdev_range(bdev, mode, start, start + len - 1);
+ if (!err)
+ err = blkdev_issue_secure_erase(bdev, start >> 9, len >> 9,
+ GFP_KERNEL);
+ filemap_invalidate_unlock(bdev->bd_inode->i_mapping);
+ return err;
+}
+
+
+static int blk_ioctl_zeroout(struct block_device *bdev, blk_mode_t mode,
+ unsigned long arg)
+{
+ uint64_t range[2];
+ uint64_t start, end, len;
+ struct inode *inode = bdev->bd_inode;
+ int err;
+
+ if (!(mode & BLK_OPEN_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)bdev_nr_bytes(bdev))
+ return -EINVAL;
+ if (end < start)
+ return -EINVAL;
+
+ /* Invalidate the page cache, including dirty pages */
+ filemap_invalidate_lock(inode->i_mapping);
+ err = truncate_bdev_range(bdev, mode, start, end);
+ if (err)
+ goto fail;
+
+ err = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
+ BLKDEV_ZERO_NOUNMAP);
+
+fail:
+ filemap_invalidate_unlock(inode->i_mapping);
+ return err;
+}
+
+static int put_ushort(unsigned short __user *argp, unsigned short val)
+{
+ return put_user(val, argp);
+}
+
+static int put_int(int __user *argp, int val)
+{
+ return put_user(val, argp);
+}
+
+static int put_uint(unsigned int __user *argp, unsigned int val)
+{
+ return put_user(val, argp);
+}
+
+static int put_long(long __user *argp, long val)
+{
+ return put_user(val, argp);
+}
+
+static int put_ulong(unsigned long __user *argp, unsigned long val)
+{
+ return put_user(val, argp);
+}
+
+static int put_u64(u64 __user *argp, u64 val)
+{
+ return put_user(val, argp);
+}
+
+#ifdef CONFIG_COMPAT
+static int compat_put_long(compat_long_t __user *argp, long val)
+{
+ return put_user(val, argp);
+}
+
+static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
+{
+ return put_user(val, argp);
+}
+#endif
+
+#ifdef CONFIG_COMPAT
+/*
+ * This is the equivalent of compat_ptr_ioctl(), to be used by block
+ * drivers that implement only commands that are completely compatible
+ * between 32-bit and 64-bit user space
+ */
+int blkdev_compat_ptr_ioctl(struct block_device *bdev, blk_mode_t mode,
+ unsigned cmd, unsigned long arg)
+{
+ struct gendisk *disk = bdev->bd_disk;
+
+ if (disk->fops->ioctl)
+ return disk->fops->ioctl(bdev, mode, cmd,
+ (unsigned long)compat_ptr(arg));
+
+ return -ENOIOCTLCMD;
+}
+EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
+#endif
+
+static bool blkdev_pr_allowed(struct block_device *bdev, blk_mode_t mode)
+{
+ /* no sense to make reservations for partitions */
+ if (bdev_is_partition(bdev))
+ return false;
+
+ if (capable(CAP_SYS_ADMIN))
+ return true;
+ /*
+ * Only allow unprivileged reservations if the file descriptor is open
+ * for writing.
+ */
+ return mode & BLK_OPEN_WRITE;
+}
+
+static int blkdev_pr_register(struct block_device *bdev, blk_mode_t mode,
+ struct pr_registration __user *arg)
+{
+ const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
+ struct pr_registration reg;
+
+ if (!blkdev_pr_allowed(bdev, mode))
+ return -EPERM;
+ if (!ops || !ops->pr_register)
+ return -EOPNOTSUPP;
+ if (copy_from_user(&reg, 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, blk_mode_t mode,
+ struct pr_reservation __user *arg)
+{
+ const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
+ struct pr_reservation rsv;
+
+ if (!blkdev_pr_allowed(bdev, mode))
+ 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, blk_mode_t mode,
+ struct pr_reservation __user *arg)
+{
+ const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
+ struct pr_reservation rsv;
+
+ if (!blkdev_pr_allowed(bdev, mode))
+ 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, blk_mode_t mode,
+ struct pr_preempt __user *arg, bool abort)
+{
+ const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
+ struct pr_preempt p;
+
+ if (!blkdev_pr_allowed(bdev, mode))
+ 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, blk_mode_t mode,
+ struct pr_clear __user *arg)
+{
+ const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
+ struct pr_clear c;
+
+ if (!blkdev_pr_allowed(bdev, mode))
+ 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);
+}
+
+static int blkdev_flushbuf(struct block_device *bdev, unsigned cmd,
+ unsigned long arg)
+{
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ mutex_lock(&bdev->bd_holder_lock);
+ if (bdev->bd_holder_ops && bdev->bd_holder_ops->sync)
+ bdev->bd_holder_ops->sync(bdev);
+ else
+ sync_blockdev(bdev);
+ mutex_unlock(&bdev->bd_holder_lock);
+
+ invalidate_bdev(bdev);
+ return 0;
+}
+
+static int blkdev_roset(struct block_device *bdev, unsigned cmd,
+ unsigned long arg)
+{
+ int ret, n;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (get_user(n, (int __user *)arg))
+ return -EFAULT;
+ if (bdev->bd_disk->fops->set_read_only) {
+ ret = bdev->bd_disk->fops->set_read_only(bdev, n);
+ if (ret)
+ return ret;
+ }
+ bdev->bd_read_only = 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;
+}
+
+#ifdef CONFIG_COMPAT
+struct compat_hd_geometry {
+ unsigned char heads;
+ unsigned char sectors;
+ unsigned short cylinders;
+ u32 start;
+};
+
+static int compat_hdio_getgeo(struct block_device *bdev,
+ struct compat_hd_geometry __user *ugeo)
+{
+ struct gendisk *disk = bdev->bd_disk;
+ struct hd_geometry geo;
+ int ret;
+
+ if (!ugeo)
+ return -EINVAL;
+ if (!disk->fops->getgeo)
+ return -ENOTTY;
+
+ memset(&geo, 0, sizeof(geo));
+ /*
+ * We need to set the startsect first, the driver may
+ * want to override it.
+ */
+ geo.start = get_start_sect(bdev);
+ ret = disk->fops->getgeo(bdev, &geo);
+ if (ret)
+ return ret;
+
+ ret = copy_to_user(ugeo, &geo, 4);
+ ret |= put_user(geo.start, &ugeo->start);
+ if (ret)
+ ret = -EFAULT;
+
+ return ret;
+}
+#endif
+
+/* set the logical block size */
+static int blkdev_bszset(struct block_device *bdev, blk_mode_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 & BLK_OPEN_EXCL)
+ return set_blocksize(bdev, n);
+
+ if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode, &bdev, NULL)))
+ return -EBUSY;
+ ret = set_blocksize(bdev, n);
+ blkdev_put(bdev, &bdev);
+
+ return ret;
+}
+
+/*
+ * Common commands that are handled the same way on native and compat
+ * user space. Note the separate arg/argp parameters that are needed
+ * to deal with the compat_ptr() conversion.
+ */
+static int blkdev_common_ioctl(struct block_device *bdev, blk_mode_t mode,
+ unsigned int cmd, unsigned long arg,
+ void __user *argp)
+{
+ unsigned int max_sectors;
+
+ switch (cmd) {
+ case BLKFLSBUF:
+ return blkdev_flushbuf(bdev, cmd, arg);
+ case BLKROSET:
+ return blkdev_roset(bdev, cmd, arg);
+ case BLKDISCARD:
+ return blk_ioctl_discard(bdev, mode, arg);
+ case BLKSECDISCARD:
+ return blk_ioctl_secure_erase(bdev, mode, argp);
+ case BLKZEROOUT:
+ return blk_ioctl_zeroout(bdev, mode, arg);
+ case BLKGETDISKSEQ:
+ return put_u64(argp, bdev->bd_disk->diskseq);
+ case BLKREPORTZONE:
+ return blkdev_report_zones_ioctl(bdev, cmd, arg);
+ case BLKRESETZONE:
+ case BLKOPENZONE:
+ case BLKCLOSEZONE:
+ case BLKFINISHZONE:
+ return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
+ case BLKGETZONESZ:
+ return put_uint(argp, bdev_zone_sectors(bdev));
+ case BLKGETNRZONES:
+ return put_uint(argp, bdev_nr_zones(bdev));
+ case BLKROGET:
+ return put_int(argp, bdev_read_only(bdev) != 0);
+ case BLKSSZGET: /* get block device logical block size */
+ return put_int(argp, bdev_logical_block_size(bdev));
+ case BLKPBSZGET: /* get block device physical block size */
+ return put_uint(argp, bdev_physical_block_size(bdev));
+ case BLKIOMIN:
+ return put_uint(argp, bdev_io_min(bdev));
+ case BLKIOOPT:
+ return put_uint(argp, bdev_io_opt(bdev));
+ case BLKALIGNOFF:
+ return put_int(argp, bdev_alignment_offset(bdev));
+ case BLKDISCARDZEROES:
+ return put_uint(argp, 0);
+ case BLKSECTGET:
+ max_sectors = min_t(unsigned int, USHRT_MAX,
+ queue_max_sectors(bdev_get_queue(bdev)));
+ return put_ushort(argp, max_sectors);
+ case BLKROTATIONAL:
+ return put_ushort(argp, !bdev_nonrot(bdev));
+ case BLKRASET:
+ case BLKFRASET:
+ if(!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+ bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE;
+ return 0;
+ case BLKRRPART:
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+ if (bdev_is_partition(bdev))
+ return -EINVAL;
+ return disk_scan_partitions(bdev->bd_disk, mode);
+ case BLKTRACESTART:
+ case BLKTRACESTOP:
+ case BLKTRACETEARDOWN:
+ return blk_trace_ioctl(bdev, cmd, argp);
+ case IOC_PR_REGISTER:
+ return blkdev_pr_register(bdev, mode, argp);
+ case IOC_PR_RESERVE:
+ return blkdev_pr_reserve(bdev, mode, argp);
+ case IOC_PR_RELEASE:
+ return blkdev_pr_release(bdev, mode, argp);
+ case IOC_PR_PREEMPT:
+ return blkdev_pr_preempt(bdev, mode, argp, false);
+ case IOC_PR_PREEMPT_ABORT:
+ return blkdev_pr_preempt(bdev, mode, argp, true);
+ case IOC_PR_CLEAR:
+ return blkdev_pr_clear(bdev, mode, 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
+ */
+long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
+{
+ struct block_device *bdev = I_BDEV(file->f_mapping->host);
+ void __user *argp = (void __user *)arg;
+ blk_mode_t mode = file_to_blk_mode(file);
+ int ret;
+
+ 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_disk->bdi->ra_pages * PAGE_SIZE) / 512);
+ case BLKGETSIZE:
+ if (bdev_nr_sectors(bdev) > ~0UL)
+ return -EFBIG;
+ return put_ulong(argp, bdev_nr_sectors(bdev));
+
+ /* 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, bdev_nr_bytes(bdev));
+
+ /* 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);
+}
+
+#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;
+ blk_mode_t mode = file_to_blk_mode(file);
+
+ 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:
+ if (bdev_nr_sectors(bdev) > ~(compat_ulong_t)0)
+ return -EFBIG;
+ return compat_put_ulong(argp, bdev_nr_sectors(bdev));
+
+ /* 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, bdev_nr_bytes(bdev));
+
+ /* 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