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Commit 4a5ce9ba authored by Jan Kara's avatar Jan Kara Committed by Jens Axboe
Browse files

loop: Push loop_ctl_mutex down to loop_get_status() 



Push loop_ctl_mutex down to loop_get_status() to avoid the unusual
convention that the function gets called with loop_ctl_mutex held and
releases it.

Signed-off-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 7ccd0791

drivers/block/loop.c

+10 −27
Original line number Diff line number Diff line
@@ -1232,6 +1232,9 @@ loop_get_status(struct loop_device *lo, struct loop_info64 *info) 
	struct kstat stat;

	int ret;



	ret = mutex_lock_killable_nested(&loop_ctl_mutex, 1);

	if (ret)

		return ret;

	if (lo->lo_state != Lo_bound) {

		mutex_unlock(&loop_ctl_mutex);

		return -ENXIO;
@@ -1346,10 +1349,8 @@ loop_get_status_old(struct loop_device *lo, struct loop_info __user *arg) { 
	struct loop_info64 info64;

	int err;



	if (!arg) {

		mutex_unlock(&loop_ctl_mutex);

	if (!arg)

		return -EINVAL;

	}

	err = loop_get_status(lo, &info64);

	if (!err)

		err = loop_info64_to_old(&info64, &info);
@@ -1364,10 +1365,8 @@ loop_get_status64(struct loop_device *lo, struct loop_info64 __user *arg) { 
	struct loop_info64 info64;

	int err;



	if (!arg) {

		mutex_unlock(&loop_ctl_mutex);

	if (!arg)

		return -EINVAL;

	}

	err = loop_get_status(lo, &info64);

	if (!err && copy_to_user(arg, &info64, sizeof(info64)))

		err = -EFAULT;
@@ -1477,12 +1476,7 @@ static int lo_ioctl(struct block_device *bdev, fmode_t mode, 
		}

		break;

	case LOOP_GET_STATUS:

		err = mutex_lock_killable_nested(&loop_ctl_mutex, 1);

		if (err)

			return err;

		err = loop_get_status_old(lo, (struct loop_info __user *) arg);

		/* loop_get_status() unlocks loop_ctl_mutex */

		break;

		return loop_get_status_old(lo, (struct loop_info __user *) arg);

	case LOOP_SET_STATUS64:

		err = -EPERM;

		if ((mode & FMODE_WRITE) || capable(CAP_SYS_ADMIN)) {
@@ -1495,12 +1489,7 @@ static int lo_ioctl(struct block_device *bdev, fmode_t mode, 
		}

		break;

	case LOOP_GET_STATUS64:

		err = mutex_lock_killable_nested(&loop_ctl_mutex, 1);

		if (err)

			return err;

		err = loop_get_status64(lo, (struct loop_info64 __user *) arg);

		/* loop_get_status() unlocks loop_ctl_mutex */

		break;

		return loop_get_status64(lo, (struct loop_info64 __user *) arg);

	case LOOP_SET_CAPACITY:

	case LOOP_SET_DIRECT_IO:

	case LOOP_SET_BLOCK_SIZE:
@@ -1625,10 +1614,8 @@ loop_get_status_compat(struct loop_device *lo, 
	struct loop_info64 info64;

	int err;



	if (!arg) {

		mutex_unlock(&loop_ctl_mutex);

	if (!arg)

		return -EINVAL;

	}

	err = loop_get_status(lo, &info64);

	if (!err)

		err = loop_info64_to_compat(&info64, arg);
@@ -1651,12 +1638,8 @@ static int lo_compat_ioctl(struct block_device *bdev, fmode_t mode, 
		}

		break;

	case LOOP_GET_STATUS:

		err = mutex_lock_killable(&loop_ctl_mutex);

		if (!err) {

		err = loop_get_status_compat(lo,

				     (struct compat_loop_info __user *)arg);

			/* loop_get_status() unlocks loop_ctl_mutex */

		}

		break;

	case LOOP_SET_CAPACITY:

	case LOOP_CLR_FD: