mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Arnd Bergmann](/assets/img/avatar_default.png)
These are common to multiple block drivers, so they should be handled by the block layer. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
364 lines
8.8 KiB
C
364 lines
8.8 KiB
C
#include <linux/blkdev.h>
|
|
#include <linux/blkpg.h>
|
|
#include <linux/blktrace_api.h>
|
|
#include <linux/cdrom.h>
|
|
#include <linux/compat.h>
|
|
#include <linux/elevator.h>
|
|
#include <linux/fd.h>
|
|
#include <linux/hdreg.h>
|
|
#include <linux/syscalls.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/types.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
static int compat_put_ushort(unsigned long arg, unsigned short val)
|
|
{
|
|
return put_user(val, (unsigned short __user *)compat_ptr(arg));
|
|
}
|
|
|
|
static int compat_put_int(unsigned long arg, int val)
|
|
{
|
|
return put_user(val, (compat_int_t __user *)compat_ptr(arg));
|
|
}
|
|
|
|
static int compat_put_long(unsigned long arg, long val)
|
|
{
|
|
return put_user(val, (compat_long_t __user *)compat_ptr(arg));
|
|
}
|
|
|
|
static int compat_put_ulong(unsigned long arg, compat_ulong_t val)
|
|
{
|
|
return put_user(val, (compat_ulong_t __user *)compat_ptr(arg));
|
|
}
|
|
|
|
static int compat_put_u64(unsigned long arg, u64 val)
|
|
{
|
|
return put_user(val, (compat_u64 __user *)compat_ptr(arg));
|
|
}
|
|
|
|
struct compat_hd_geometry {
|
|
unsigned char heads;
|
|
unsigned char sectors;
|
|
unsigned short cylinders;
|
|
u32 start;
|
|
};
|
|
|
|
static int compat_hdio_getgeo(struct gendisk *disk, struct block_device *bdev,
|
|
struct compat_hd_geometry __user *ugeo)
|
|
{
|
|
struct hd_geometry geo;
|
|
int ret;
|
|
|
|
if (!ugeo)
|
|
return -EINVAL;
|
|
if (!disk->fops->getgeo)
|
|
return -ENOTTY;
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
static int compat_hdio_ioctl(struct inode *inode, struct file *file,
|
|
struct gendisk *disk, unsigned int cmd, unsigned long arg)
|
|
{
|
|
mm_segment_t old_fs = get_fs();
|
|
unsigned long kval;
|
|
unsigned int __user *uvp;
|
|
int error;
|
|
|
|
set_fs(KERNEL_DS);
|
|
error = blkdev_driver_ioctl(inode, file, disk,
|
|
cmd, (unsigned long)(&kval));
|
|
set_fs(old_fs);
|
|
|
|
if (error == 0) {
|
|
uvp = compat_ptr(arg);
|
|
if (put_user(kval, uvp))
|
|
error = -EFAULT;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
#define BLKBSZGET_32 _IOR(0x12, 112, int)
|
|
#define BLKBSZSET_32 _IOW(0x12, 113, int)
|
|
#define BLKGETSIZE64_32 _IOR(0x12, 114, int)
|
|
|
|
struct compat_blk_user_trace_setup {
|
|
char name[32];
|
|
u16 act_mask;
|
|
u32 buf_size;
|
|
u32 buf_nr;
|
|
compat_u64 start_lba;
|
|
compat_u64 end_lba;
|
|
u32 pid;
|
|
};
|
|
#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
|
|
|
|
static int compat_blk_trace_setup(struct block_device *bdev, char __user *arg)
|
|
{
|
|
struct blk_user_trace_setup buts;
|
|
struct compat_blk_user_trace_setup cbuts;
|
|
struct request_queue *q;
|
|
int ret;
|
|
|
|
q = bdev_get_queue(bdev);
|
|
if (!q)
|
|
return -ENXIO;
|
|
|
|
if (copy_from_user(&cbuts, arg, sizeof(cbuts)))
|
|
return -EFAULT;
|
|
|
|
buts = (struct blk_user_trace_setup) {
|
|
.act_mask = cbuts.act_mask,
|
|
.buf_size = cbuts.buf_size,
|
|
.buf_nr = cbuts.buf_nr,
|
|
.start_lba = cbuts.start_lba,
|
|
.end_lba = cbuts.end_lba,
|
|
.pid = cbuts.pid,
|
|
};
|
|
memcpy(&buts.name, &cbuts.name, 32);
|
|
|
|
mutex_lock(&bdev->bd_mutex);
|
|
ret = do_blk_trace_setup(q, bdev, &buts);
|
|
mutex_unlock(&bdev->bd_mutex);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (copy_to_user(arg, &buts.name, 32))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int compat_blkdev_driver_ioctl(struct inode *inode, struct file *file,
|
|
struct gendisk *disk, unsigned cmd, unsigned long arg)
|
|
{
|
|
int ret;
|
|
|
|
switch (arg) {
|
|
case HDIO_GET_UNMASKINTR:
|
|
case HDIO_GET_MULTCOUNT:
|
|
case HDIO_GET_KEEPSETTINGS:
|
|
case HDIO_GET_32BIT:
|
|
case HDIO_GET_NOWERR:
|
|
case HDIO_GET_DMA:
|
|
case HDIO_GET_NICE:
|
|
case HDIO_GET_WCACHE:
|
|
case HDIO_GET_ACOUSTIC:
|
|
case HDIO_GET_ADDRESS:
|
|
case HDIO_GET_BUSSTATE:
|
|
return compat_hdio_ioctl(inode, file, disk, cmd, arg);
|
|
/*
|
|
* No handler required for the ones below, we just need to
|
|
* convert arg to a 64 bit pointer.
|
|
*/
|
|
case BLKSECTSET:
|
|
/*
|
|
* 0x03 -- HD/IDE ioctl's used by hdparm and friends.
|
|
* Some need translations, these do not.
|
|
*/
|
|
case HDIO_GET_IDENTITY:
|
|
case HDIO_DRIVE_TASK:
|
|
case HDIO_DRIVE_CMD:
|
|
case HDIO_SCAN_HWIF:
|
|
/* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
|
|
case 0x330:
|
|
/* 0x02 -- Floppy ioctls */
|
|
case FDMSGON:
|
|
case FDMSGOFF:
|
|
case FDSETEMSGTRESH:
|
|
case FDFLUSH:
|
|
case FDWERRORCLR:
|
|
case FDSETMAXERRS:
|
|
case FDGETMAXERRS:
|
|
case FDGETDRVTYP:
|
|
case FDEJECT:
|
|
case FDCLRPRM:
|
|
case FDFMTBEG:
|
|
case FDFMTEND:
|
|
case FDRESET:
|
|
case FDTWADDLE:
|
|
case FDFMTTRK:
|
|
case FDRAWCMD:
|
|
/* CDROM stuff */
|
|
case CDROMPAUSE:
|
|
case CDROMRESUME:
|
|
case CDROMPLAYMSF:
|
|
case CDROMPLAYTRKIND:
|
|
case CDROMREADTOCHDR:
|
|
case CDROMREADTOCENTRY:
|
|
case CDROMSTOP:
|
|
case CDROMSTART:
|
|
case CDROMEJECT:
|
|
case CDROMVOLCTRL:
|
|
case CDROMSUBCHNL:
|
|
case CDROMMULTISESSION:
|
|
case CDROM_GET_MCN:
|
|
case CDROMRESET:
|
|
case CDROMVOLREAD:
|
|
case CDROMSEEK:
|
|
case CDROMPLAYBLK:
|
|
case CDROMCLOSETRAY:
|
|
case CDROM_DISC_STATUS:
|
|
case CDROM_CHANGER_NSLOTS:
|
|
case CDROM_GET_CAPABILITY:
|
|
/* Ignore cdrom.h about these next 5 ioctls, they absolutely do
|
|
* not take a struct cdrom_read, instead they take a struct cdrom_msf
|
|
* which is compatible.
|
|
*/
|
|
case CDROMREADMODE2:
|
|
case CDROMREADMODE1:
|
|
case CDROMREADRAW:
|
|
case CDROMREADCOOKED:
|
|
case CDROMREADALL:
|
|
/* DVD ioctls */
|
|
case DVD_READ_STRUCT:
|
|
case DVD_WRITE_STRUCT:
|
|
case DVD_AUTH:
|
|
arg = (unsigned long)compat_ptr(arg);
|
|
/* These intepret arg as an unsigned long, not as a pointer,
|
|
* so we must not do compat_ptr() conversion. */
|
|
case HDIO_SET_MULTCOUNT:
|
|
case HDIO_SET_UNMASKINTR:
|
|
case HDIO_SET_KEEPSETTINGS:
|
|
case HDIO_SET_32BIT:
|
|
case HDIO_SET_NOWERR:
|
|
case HDIO_SET_DMA:
|
|
case HDIO_SET_PIO_MODE:
|
|
case HDIO_SET_NICE:
|
|
case HDIO_SET_WCACHE:
|
|
case HDIO_SET_ACOUSTIC:
|
|
case HDIO_SET_BUSSTATE:
|
|
case HDIO_SET_ADDRESS:
|
|
case CDROMEJECT_SW:
|
|
case CDROM_SET_OPTIONS:
|
|
case CDROM_CLEAR_OPTIONS:
|
|
case CDROM_SELECT_SPEED:
|
|
case CDROM_SELECT_DISC:
|
|
case CDROM_MEDIA_CHANGED:
|
|
case CDROM_DRIVE_STATUS:
|
|
case CDROM_LOCKDOOR:
|
|
case CDROM_DEBUG:
|
|
break;
|
|
default:
|
|
/* unknown ioctl number */
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
if (disk->fops->unlocked_ioctl)
|
|
return disk->fops->unlocked_ioctl(file, cmd, arg);
|
|
|
|
if (disk->fops->ioctl) {
|
|
lock_kernel();
|
|
ret = disk->fops->ioctl(inode, file, cmd, arg);
|
|
unlock_kernel();
|
|
return ret;
|
|
}
|
|
|
|
return -ENOTTY;
|
|
}
|
|
|
|
static int compat_blkdev_locked_ioctl(struct inode *inode, struct file *file,
|
|
struct block_device *bdev,
|
|
unsigned cmd, unsigned long arg)
|
|
{
|
|
struct backing_dev_info *bdi;
|
|
|
|
switch (cmd) {
|
|
case BLKRAGET:
|
|
case BLKFRAGET:
|
|
if (!arg)
|
|
return -EINVAL;
|
|
bdi = blk_get_backing_dev_info(bdev);
|
|
if (bdi == NULL)
|
|
return -ENOTTY;
|
|
return compat_put_long(arg,
|
|
(bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
|
|
case BLKROGET: /* compatible */
|
|
return compat_put_int(arg, bdev_read_only(bdev) != 0);
|
|
case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
|
|
return compat_put_int(arg, block_size(bdev));
|
|
case BLKSSZGET: /* get block device hardware sector size */
|
|
return compat_put_int(arg, bdev_hardsect_size(bdev));
|
|
case BLKSECTGET:
|
|
return compat_put_ushort(arg,
|
|
bdev_get_queue(bdev)->max_sectors);
|
|
case BLKRASET: /* compatible, but no compat_ptr (!) */
|
|
case BLKFRASET:
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EACCES;
|
|
bdi = blk_get_backing_dev_info(bdev);
|
|
if (bdi == NULL)
|
|
return -ENOTTY;
|
|
bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
|
|
return 0;
|
|
case BLKGETSIZE:
|
|
if ((bdev->bd_inode->i_size >> 9) > ~0UL)
|
|
return -EFBIG;
|
|
return compat_put_ulong(arg, bdev->bd_inode->i_size >> 9);
|
|
|
|
case BLKGETSIZE64_32:
|
|
return compat_put_u64(arg, bdev->bd_inode->i_size);
|
|
|
|
case BLKTRACESETUP32:
|
|
return compat_blk_trace_setup(bdev, compat_ptr(arg));
|
|
case BLKTRACESTART: /* compatible */
|
|
case BLKTRACESTOP: /* compatible */
|
|
case BLKTRACETEARDOWN: /* compatible */
|
|
return blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
|
|
}
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
/* 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 = -ENOIOCTLCMD;
|
|
struct inode *inode = file->f_mapping->host;
|
|
struct block_device *bdev = inode->i_bdev;
|
|
struct gendisk *disk = bdev->bd_disk;
|
|
|
|
switch (cmd) {
|
|
case HDIO_GETGEO:
|
|
return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
|
|
case BLKFLSBUF:
|
|
case BLKROSET:
|
|
/*
|
|
* the ones below are implemented in blkdev_locked_ioctl,
|
|
* but we call blkdev_ioctl, which gets the lock for us
|
|
*/
|
|
case BLKRRPART:
|
|
return blkdev_ioctl(inode, file, cmd,
|
|
(unsigned long)compat_ptr(arg));
|
|
case BLKBSZSET_32:
|
|
return blkdev_ioctl(inode, file, BLKBSZSET,
|
|
(unsigned long)compat_ptr(arg));
|
|
}
|
|
|
|
lock_kernel();
|
|
ret = compat_blkdev_locked_ioctl(inode, file, bdev, cmd, arg);
|
|
/* FIXME: why do we assume -> compat_ioctl needs the BKL? */
|
|
if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
|
|
ret = disk->fops->compat_ioctl(file, cmd, arg);
|
|
unlock_kernel();
|
|
|
|
if (ret != -ENOIOCTLCMD)
|
|
return ret;
|
|
|
|
return compat_blkdev_driver_ioctl(inode, file, disk, cmd, arg);
|
|
}
|