Contributors: 34
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Christoph Hellwig |
1116 |
33.37% |
14 |
17.07% |
| Arnd Bergmann |
1076 |
32.18% |
5 |
6.10% |
| Al Viro |
437 |
13.07% |
16 |
19.51% |
| Martin K. Petersen |
189 |
5.65% |
6 |
7.32% |
| Linus Torvalds (pre-git) |
114 |
3.41% |
1 |
1.22% |
| Linus Torvalds |
61 |
1.82% |
5 |
6.10% |
| David Woodhouse |
54 |
1.61% |
1 |
1.22% |
| Darrick J. Wong |
51 |
1.53% |
1 |
1.22% |
| Dmitriy Monakhov |
48 |
1.44% |
1 |
1.22% |
| Shaun Tancheff |
29 |
0.87% |
1 |
1.22% |
| Damien Le Moal |
26 |
0.78% |
2 |
2.44% |
| Andrew Morton |
25 |
0.75% |
4 |
4.88% |
| Stefan Haberland |
20 |
0.60% |
1 |
1.22% |
| Akinobu Mita |
13 |
0.39% |
1 |
1.22% |
| Ilya Dryomov |
12 |
0.36% |
1 |
1.22% |
| Ajay Joshi |
10 |
0.30% |
1 |
1.22% |
| Jarod Wilson |
10 |
0.30% |
1 |
1.22% |
| Tejun Heo |
8 |
0.24% |
4 |
4.88% |
| Vivek Goyal |
8 |
0.24% |
1 |
1.22% |
| Adrian Hunter |
6 |
0.18% |
1 |
1.22% |
| Vasiliy Kulikov |
4 |
0.12% |
1 |
1.22% |
| Jens Axboe |
4 |
0.12% |
1 |
1.22% |
| Alan Cox |
3 |
0.09% |
1 |
1.22% |
| Paul Gortmaker |
3 |
0.09% |
1 |
1.22% |
| Mike Snitzer |
3 |
0.09% |
1 |
1.22% |
| Jan Kara |
2 |
0.06% |
1 |
1.22% |
| Bart Van Assche |
2 |
0.06% |
1 |
1.22% |
| Arjan van de Ven |
2 |
0.06% |
1 |
1.22% |
| Richard Gooch |
2 |
0.06% |
1 |
1.22% |
| Ming Lei |
2 |
0.06% |
1 |
1.22% |
| Andries E. Brouwer |
1 |
0.03% |
1 |
1.22% |
| Kirill A. Shutemov |
1 |
0.03% |
1 |
1.22% |
| Adrian Bunk |
1 |
0.03% |
1 |
1.22% |
| Randy Dunlap |
1 |
0.03% |
1 |
1.22% |
| Total |
3344 |
|
82 |
|
// 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 blkpg_partition p;
long long start, length;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))
return -EFAULT;
if (bdev != bdev->bd_contains)
return -EINVAL;
if (p.pno <= 0)
return -EINVAL;
if (op == BLKPG_DEL_PARTITION)
return bdev_del_partition(bdev, p.pno);
start = p.start >> SECTOR_SHIFT;
length = p.length >> SECTOR_SHIFT;
/* check for fit in a hd_struct */
if (sizeof(sector_t) < sizeof(long long)) {
long pstart = start, plength = length;
if (pstart != start || plength != length || pstart < 0 ||
plength < 0 || p.pno > 65535)
return -EINVAL;
}
switch (op) {
case BLKPG_ADD_PARTITION:
/* check if partition is aligned to blocksize */
if (p.start & (bdev_logical_block_size(bdev) - 1))
return -EINVAL;
return bdev_add_partition(bdev, p.pno, start, length);
case BLKPG_RESIZE_PARTITION:
return bdev_resize_partition(bdev, 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 blkdev_reread_part(struct block_device *bdev)
{
int ret;
if (!disk_part_scan_enabled(bdev->bd_disk) || bdev != bdev->bd_contains)
return -EINVAL;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
mutex_lock(&bdev->bd_mutex);
ret = bdev_disk_changed(bdev, false);
mutex_unlock(&bdev->bd_mutex);
return ret;
}
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 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
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);
#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, 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,
(unsigned long)compat_ptr(arg));
return -ENOIOCTLCMD;
}
EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
#endif
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;
}
#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, 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;
}
/*
* 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, fmode_t mode,
unsigned cmd, unsigned long arg, void __user *argp)
{
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(argp, bdev_zone_sectors(bdev));
case BLKGETNRZONES:
return put_uint(argp, blkdev_nr_zones(bdev->bd_disk));
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, !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 BLKRRPART:
return blkdev_reread_part(bdev);
case BLKTRACESTART:
case BLKTRACESTOP:
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 -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 __blkdev_driver_ioctl(bdev, mode, cmd, arg);
return ret;
}
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 inode *inode = file->f_mapping->host;
struct block_device *bdev = inode->i_bdev;
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