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compat_ioctl: handle blk_trace ioctls

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blk_trace_setup is broken on x86_64 compat systems,
this makes the code work correctly on all 64 bit architectures
in compat mode.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Arnd Bergmann
2007-10-09 13:23:53 +02:00
committed by Jens Axboe
parent 7199d4cdd8
commit 171044d449
4 changed files with 94 additions and 29 deletions
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block/compat_ioctl.c
+54
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@@ -40,6 +40,53 @@ static int compat_put_u64(unsigned long arg, u64 val)
#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)
{
@@ -197,6 +244,13 @@ static int compat_blkdev_locked_ioctl(struct inode *inode, struct file *file,
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;
}