March 21, 2016
8:18 a.m.
Maybe I had misunderstood your meaning. You are meaning I have assign 0 to my device major number? The major variable is reassigned by the kernel in blkplay_init function. http://stackoverflow.com/questions/13518404/add-disk-hangs-on-insmod <http://stackoverflow.com/questions/13518404/add-disk-hangs-on-insmod> This post solve the problem. Now, I can compile it, insmod it. But it’s give me a permission error when I open the device.
On Mar 21, 2016, at 10:55 AM, Valdis.Kletnieks@vt.edu wrote:
On Mon, 21 Mar 2016 09:53:47 +0800, 张云 said:
The code is just for learning block driver
THe kernel doesn't know that. You call a routine with the wrong parameters, it will not work properly.