mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 21:54:06 +08:00
ff9ea32381
bdev_get_queue() returns the request_queue associated with the specified block_device. blk_get_backing_dev_info() makes use of bdev_get_queue() to determine the associated bdi given a block_device. All the callers of bdev_get_queue() including blk_get_backing_dev_info() assume that bdev_get_queue() may return NULL and implement NULL handling; however, bdev_get_queue() requires the passed in block_device is opened and attached to its gendisk. Because an active gendisk always has a valid request_queue associated with it, bdev_get_queue() can never return NULL and neither can blk_get_backing_dev_info(). Make it clear that neither of the two functions can return NULL and remove NULL handling from all the callers. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Chris Mason <clm@fb.com> Cc: Dave Chinner <david@fromorbit.com> Signed-off-by: Jens Axboe <axboe@fb.com>
431 lines
11 KiB
C
431 lines
11 KiB
C
#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 <asm/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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
static int blkdev_reread_part(struct block_device *bdev)
|
|
{
|
|
struct gendisk *disk = bdev->bd_disk;
|
|
int res;
|
|
|
|
if (!disk_part_scan_enabled(disk) || bdev != bdev->bd_contains)
|
|
return -EINVAL;
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EACCES;
|
|
if (!mutex_trylock(&bdev->bd_mutex))
|
|
return -EBUSY;
|
|
res = rescan_partitions(disk, bdev);
|
|
mutex_unlock(&bdev->bd_mutex);
|
|
return res;
|
|
}
|
|
|
|
static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
|
|
uint64_t len, int secure)
|
|
{
|
|
unsigned long flags = 0;
|
|
|
|
if (start & 511)
|
|
return -EINVAL;
|
|
if (len & 511)
|
|
return -EINVAL;
|
|
start >>= 9;
|
|
len >>= 9;
|
|
|
|
if (start + len > (i_size_read(bdev->bd_inode) >> 9))
|
|
return -EINVAL;
|
|
if (secure)
|
|
flags |= BLKDEV_DISCARD_SECURE;
|
|
return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags);
|
|
}
|
|
|
|
static int blk_ioctl_zeroout(struct block_device *bdev, uint64_t start,
|
|
uint64_t len)
|
|
{
|
|
if (start & 511)
|
|
return -EINVAL;
|
|
if (len & 511)
|
|
return -EINVAL;
|
|
start >>= 9;
|
|
len >>= 9;
|
|
|
|
if (start + len > (i_size_read(bdev->bd_inode) >> 9))
|
|
return -EINVAL;
|
|
|
|
return blkdev_issue_zeroout(bdev, start, len, GFP_KERNEL);
|
|
}
|
|
|
|
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);
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
/*
|
|
* always keep this in sync with compat_blkdev_ioctl()
|
|
*/
|
|
int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct gendisk *disk = bdev->bd_disk;
|
|
struct backing_dev_info *bdi;
|
|
loff_t size;
|
|
int ret, n;
|
|
unsigned int max_sectors;
|
|
|
|
switch(cmd) {
|
|
case BLKFLSBUF:
|
|
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;
|
|
|
|
case BLKROSET:
|
|
ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
|
|
if (!is_unrecognized_ioctl(ret))
|
|
return ret;
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EACCES;
|
|
if (get_user(n, (int __user *)(arg)))
|
|
return -EFAULT;
|
|
set_device_ro(bdev, n);
|
|
return 0;
|
|
|
|
case BLKDISCARD:
|
|
case BLKSECDISCARD: {
|
|
uint64_t range[2];
|
|
|
|
if (!(mode & FMODE_WRITE))
|
|
return -EBADF;
|
|
|
|
if (copy_from_user(range, (void __user *)arg, sizeof(range)))
|
|
return -EFAULT;
|
|
|
|
return blk_ioctl_discard(bdev, range[0], range[1],
|
|
cmd == BLKSECDISCARD);
|
|
}
|
|
case BLKZEROOUT: {
|
|
uint64_t range[2];
|
|
|
|
if (!(mode & FMODE_WRITE))
|
|
return -EBADF;
|
|
|
|
if (copy_from_user(range, (void __user *)arg, sizeof(range)))
|
|
return -EFAULT;
|
|
|
|
return blk_ioctl_zeroout(bdev, range[0], range[1]);
|
|
}
|
|
|
|
case HDIO_GETGEO: {
|
|
struct hd_geometry geo;
|
|
|
|
if (!arg)
|
|
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((struct hd_geometry __user *)arg, &geo,
|
|
sizeof(geo)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
case BLKRAGET:
|
|
case BLKFRAGET:
|
|
if (!arg)
|
|
return -EINVAL;
|
|
bdi = blk_get_backing_dev_info(bdev);
|
|
return put_long(arg, (bdi->ra_pages * PAGE_CACHE_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, bdev_discard_zeroes_data(bdev));
|
|
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;
|
|
bdi = blk_get_backing_dev_info(bdev);
|
|
bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
|
|
return 0;
|
|
case BLKBSZSET:
|
|
/* set the logical block size */
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EACCES;
|
|
if (!arg)
|
|
return -EINVAL;
|
|
if (get_user(n, (int __user *) arg))
|
|
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;
|
|
case BLKPG:
|
|
ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
|
|
break;
|
|
case BLKRRPART:
|
|
ret = blkdev_reread_part(bdev);
|
|
break;
|
|
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:
|
|
ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
|
|
break;
|
|
default:
|
|
ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(blkdev_ioctl);
|