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loop: Push loop_ctl_mutex down to loop_change_fd() 

Push loop_ctl_mutex down to loop_change_fd(). We will need this to be
able to call loop_reread_partitions() without loop_ctl_mutex.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jan Kara 2018-11-08 14:01:11 +01:00 committed by Jens Axboe
parent 757ecf40b7
commit c371077000
1 changed files with 11 additions and 11 deletions
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22
drivers/block/loop.c
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@ -691,19 +691,22 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev,
struct file *file, *old_file;
int error;
error = mutex_lock_killable_nested(&loop_ctl_mutex, 1);
if (error)
return error;
error = -ENXIO;
if (lo->lo_state != Lo_bound)
goto out;
goto out_unlock;
/* the loop device has to be read-only */
error = -EINVAL;
if (!(lo->lo_flags & LO_FLAGS_READ_ONLY))
goto out;
goto out_unlock;
error = -EBADF;
file = fget(arg);
if (!file)
goto out;
goto out_unlock;
error = loop_validate_file(file, bdev);
if (error)
@ -730,11 +733,13 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev,
fput(old_file);
if (lo->lo_flags & LO_FLAGS_PARTSCAN)
loop_reread_partitions(lo, bdev);
mutex_unlock(&loop_ctl_mutex);
return 0;
out_putf:
out_putf:
fput(file);
out:
out_unlock:
mutex_unlock(&loop_ctl_mutex);
return error;
}
@ -1469,12 +1474,7 @@ static int lo_ioctl(struct block_device *bdev, fmode_t mode,
case LOOP_SET_FD:
return loop_set_fd(lo, mode, bdev, arg);
case LOOP_CHANGE_FD:
err = mutex_lock_killable_nested(&loop_ctl_mutex, 1);
if (err)
return err;
err = loop_change_fd(lo, bdev, arg);
mutex_unlock(&loop_ctl_mutex);
break;
return loop_change_fd(lo, bdev, arg);
case LOOP_CLR_FD:
return loop_clr_fd(lo);
case LOOP_SET_STATUS: