reinstall device driver

//specifies which device to use as the data device,eg,/dev/sdametadatadevice string//specifies which device to use as the metadata Device,eg,/dev/sdadoblkdisc ARD boolthinpblocksize Uint32//thin pool block size}//devmapper Driver data structure type

Today, we will go to Chapter 6 advanced character driver operations in Linux Device Drivers (version 3rd. I. IOCTL In addition to reading and writing capabilities, most devices can perform operations beyond simple data transmission. Therefore, device drivers must also be able to perform various hardware control operations. these operations are often supported b

In the above-mentioned Drive series blog, we have learned about blocking and non-blocking, asynchronous notification, polling, memory and I/O port access, concurrency control and other knowledge, the key device driver is relatively simple, this chapter content can deepen our character device driver architecture, blocki

processing the sent data, clear tbusy in the sending end interrupt, and use mark_bh () to call the notification system to continue sending. Another method is to disable tbusy from being set to 1, so that the system always considers the hardware idle, but reports cannot be sent successfully. The system will always try again. 3.3 Flow Control) Traffic control is required for sending and receiving network data. These controls are implemented in the system and do not need to be implemented by the

Linux Device Driver Article 2: How to implement a simple hello world Driver The previous article introduced the concept of the linux driver and the basic category of the device driver in linux and the basis and differences of each

Path for Linux Device Driver engineers-device model (top) Underlying model K-style Reprinted please indicate from Hengyang Normal University 08 electric 2 Y-kee http://blog.csdn.net/ayangke,QQ:843308498 I. Important knowledge points 1. sysfs File System The sysfs file system is a special file system similar to the proc file system. It exists in the memory and i

Introduction of character device driver　　The app uses open, read, write, and other functions to operate the underlying hardware. The driver also has corresponding functions such as Xxx_open. How to find a driver in a function depends on the driver framework.II. Building a

The Driver is also known as the Device Driver. In the modern computer architecture, the operating system does not directly deal with hardware, but communicates with hardware through drivers. On the same computer, although the devices are the same, the drivers vary greatly due to different operating systems. However, no matter what is similar, it can be summ

The previous article introduced the concept of Linux drive, and the basic classification of device drivers under Linux and the basis and difference of each classification, this article describes how to write a simple test driver like Hello World. and the only function of this driver is to output Hello world.Before writing a specific instance, let's take a look at

This document describes how to develop an I2C interface touch screen driver mounted on the friendly mini-2440 platform. Kernel edition linux-2.6.32.2,The platform is a touch screen with the arm9-s3c2440 + I2C interface. For exampleLinux I2C driver architectureDescriptionHttp://www.lupaworld.com/273398/viewspace-204237.html To mount a new I2C device, you nee

=alloc_chrdev_region (char_dev_no,0,1,"chartest"); Char_major=major (CHAR_DEV_NO); } PRINTK (Kern_alert "Hello,,we succeed\n"); if (result return result; Chartest_setup_cdev (); PRINTK (Kern_alert "Hello,,we succeed\n"); return 0; } static void Char_exit (void) { Cdev_del (glob_char_dev.cdev); Unregister_chrdev_region (MKDEV (char_major,0), 1); //zhu XIAO Device_unregister (Char_class_dev); Class_destroy (Char_class); PRINTK (Kern_alert "720 unregister succe

, struct file * filp) { Spin_lock ( singleuid_lock ); Singleuid_count --; Spin_unlock ( singleuid_lock ); Return 0; } We can see that the locks are used for operations on structures such as singleuid_count and singleuid_owner. Block-type open instead of ebusy: when the device is not accessible, it does not directly return ebusy, but is implemented by blocking I/O. Sample Code: Static int singleuid_count; Static uid_t singleuid_owner; Static spinlock_