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block: cleanup blkdev_ioctl 

Split out helpers for all non-trivial ioctls to make this function simpler,
and also start passing around a pointer version of the argument, as that's
what most ioctl handlers actually need.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
hifive-unleashed-5.1
Christoph Hellwig 2015-10-15 14:10:47 +02:00 committed by Jens Axboe
parent ef658fc2a6
commit d8e4bb8103
1 changed files with 128 additions and 101 deletions
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229
block/ioctl.c
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@ -193,10 +193,20 @@ int blkdev_reread_part(struct block_device *bdev)
}
EXPORT_SYMBOL(blkdev_reread_part);
static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
uint64_t len, int secure)
static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
unsigned long arg, unsigned long flags)
{
unsigned long flags = 0;
uint64_t range[2];
uint64_t start, 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];
if (start & 511)
return -EINVAL;
@ -207,14 +217,24 @@ static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
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)
static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
unsigned long arg)
{
uint64_t range[2];
uint64_t start, 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];
if (start & 511)
return -EINVAL;
if (len & 511)
@ -295,89 +315,115 @@ static inline int is_unrecognized_ioctl(int ret)
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;
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;
}
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)
{
struct gendisk *disk = bdev->bd_disk;
struct backing_dev_info *bdi;
void __user *argp = (void __user *)arg;
loff_t size;
int ret, n;
unsigned int max_sectors;
switch(cmd) {
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;
return blkdev_flushbuf(bdev, mode, cmd, arg);
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;
return blkdev_roset(bdev, mode, cmd, arg);
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;
}
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 HDIO_GETGEO:
return blkdev_getgeo(bdev, argp);
case BLKRAGET:
case BLKFRAGET:
if (!arg)
@ -414,28 +460,11 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
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;
return blkdev_bszset(bdev, mode, argp);
case BLKPG:
ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
break;
return blkpg_ioctl(bdev, argp);
case BLKRRPART:
ret = blkdev_reread_part(bdev);
break;
return blkdev_reread_part(bdev);
case BLKGETSIZE:
size = i_size_read(bdev->bd_inode);
if ((size >> 9) > ~0UL)
@ -447,11 +476,9 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
case BLKTRACESTOP:
case BLKTRACESETUP:
case BLKTRACETEARDOWN:
ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
break;
return blk_trace_ioctl(bdev, cmd, argp);
default:
ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
}
return ret;
}
EXPORT_SYMBOL_GPL(blkdev_ioctl);