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block: push BKL into blktrace ioctls

Browse source 
The blktrace driver currently needs the BKL, but
we should not need to take that in the block layer,
so just push it down into the driver itself.

It is quite likely that the BKL is not actually
required in blktrace code and could be removed
in a follow-on patch.

Signed-off-by: Arnd Bergmann <[email protected]>
Acked-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Arnd Bergmann 2010-07-07 16:51:26 +02:00 • committed by Jens Axboe
commit 62c2a7d969
4 changed files with 55 additions and 58 deletions
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56
block/compat_ioctl.c
View file

@ -535,56 +535,6 @@ out:
return err;
}
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;
char b[BDEVNAME_SIZE];
int ret;
q = bdev_get_queue(bdev);
if (!q)
return -ENXIO;
if (copy_from_user(&cbuts, arg, sizeof(cbuts)))
return -EFAULT;
bdevname(bdev, b);
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, b, bdev->bd_dev, 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 block_device *bdev, fmode_t mode,
unsigned cmd, unsigned long arg)
{
@ -802,16 +752,10 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
return compat_put_u64(arg, bdev->bd_inode->i_size);
case BLKTRACESETUP32:
lock_kernel();
ret = compat_blk_trace_setup(bdev, compat_ptr(arg));
unlock_kernel();
return ret;
case BLKTRACESTART: /* compatible */
case BLKTRACESTOP: /* compatible */
case BLKTRACETEARDOWN: /* compatible */
lock_kernel();
ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
unlock_kernel();
return ret;
default:
if (disk->fops->compat_ioctl)

2
block/ioctl.c
View file

@ -320,9 +320,7 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
case BLKTRACESTOP:
case BLKTRACESETUP:
case BLKTRACETEARDOWN:
lock_kernel();
ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
unlock_kernel();
break;
default:
ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);