'Struct file' diaporamas de présentation

Today

Today. Implementing filesystems on disk Trade-offs and performance Look at some of the VFS objects for Linux No complete listings Example of filesystem implementation Ext2/3. Filesystem Implementation. A possible file system layout. Files consists of blocks of data. 1. 2. 3. 8. 12.

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Char Drivers

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Char Drivers

Char Drivers. Ted Baker ? Andy Wang COP 5641 / CIS 4930. Goal. Write a complete char device driver scull Simple Character Utility for Loading Localities Not hardware dependent Just acts on some memory allocated from the kernel. The Design of scull. Implements various devices

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Advanced Operating System Project Device Drivers

Advanced Operating System Project Device Drivers. M. Muztaba Fuad. Overview. Basics Definitions What the OS books say? Linux way of doing things (Kernel 2.4) Check Linux Source code. Windows way of doing things Check Windows Source code (just kidding !). Write your own driver in Linux

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Ch 12 Virtual File System (VFS)

? 48 ? : Virtual File System (VFS). Ch 12 Virtual File System (VFS). File System Many Different Implementations. FS A -- Bitmap. Bootblock Superblock -- per FS Metadata ? eg free list: Inode list -- per File Metadata Data block. FS B -- linked list. FS C. Disk File Systems:

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Ch 12 Virtual File System (VFS)

? 48 ? : Virtual File System (VFS). Ch 12 Virtual File System (VFS). File System Many Different Implementations. FS A -- Bitmap. Bootblock Superblock -- per FS Metadata ? eg free list: Inode list -- per File Metadata Data block. FS B -- linked list. FS C.

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Linux Kernel Module

Linux Kernel Module. 9564552 ??? 9662636 ??? 9662571 ??? 9662603 ???. Outline. Introduction Kernel Components Module load and unload operation The detail of load module operation The different between kernel 2.4 and 2.6 How to write a kernel module. Introduction.

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RT_FIFO, Device driver

RT_FIFO, Device driver. Outline. Introduction of RT_FIFOs Device driver RT_FIFO Example. Intro. of RT_FIFOs(1). The RT_FIFO is a mechanism, implemented as a character device , to communicate between realtime tasks and ordinary Linux processes. RT FIFO. User Process. RT Process.

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Linux File System

Linux File System. ???? VFS VFS ??? ?? VFS ????? VFS ?????? ?????????? ext2?ext3 ???? ???? proc ???? CRAMFS ????. ?????????. Windows FAT16,FAT32, NTFS ?? UNIX: UFS (Unix File System) BSD ???? FFS(Fast File System) Proc File System? ??????? Linux File System

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Linux ?????

Linux ?????. ????? ????????? ?????? ????. ?????????. Linux ?????????? 0.halt ---------( ??? 1.single-------( ???? 2.multiuser,without NFS ????? 3.Full multiuser mode ??????? 4.unused 5.X11---------------------( ????? 6.reboot-------------------( ?????. linux ????????.

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Therac-25

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CS 3204 Operating Systems

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CS 3204 Operating Systems

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?? Linux ????????

?? Linux ????????. What we have learned?. ? module ???????? init_module, cleanup_module ??????????????????????? mknod /dev/status c <major_num> 0 ?? / ???? register_chrdev, unregister_chrdev struct file_operations (include/linux/fs.h) ?? file_operations ????????.

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?? Linux ????????

?? Linux ????????. What we have learned?. ? module ???????? init_module, cleanup_module ??????????????????????? mknod /dev/status c <major_num> 0 ?? / ???? register_chrdev, unregister_chrdev struct file_operations (include/linux/fs.h) ?? file_operations ????????.

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Linux Filesystem Features

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chapter 5- Block Driver

chapter 5- Block Driver. chenbo2008@ustc.edu.cn ????????????. Block Driver. int register_blkdev(unsigned int major, const char *name); major : name : proc/devices int unregister_blkdev(unsigned int major, const char *name);. example. sbull_major = register_blkdev(sbull_major, "sbull");

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UQC152H3 Advanced OS

UQC152H3 Advanced OS. Writing a Device Driver. The SCULL Device Driver. Simple Character Utility for Loading Localities 6 devices types Scull-03 Scullpipe0-3 Scullsingle Scullpriv Sculluid Scullwuid. Types of SCULL. Scull0-3 Global & persistent, can be opened many times Scullpipe0-3

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CS 3204 Operating Systems

CS 3204 Operating Systems. Godmar Back. Lecture 36. Announcements. Project 4 due Wed, May 3, 11:59pm Read section 11.6 on RAID. Filesystems. Logging Filesystems Volume Managers Linux VFS. Logging Filesystems. Idea from databases: keep track of changes

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