"Learning God-rhel7" 1-20-1-the operation of the kernel module

What this section says:

using the Linux kernel module

actual combat-compile an NTFS kernel module, implement Linux mount NTFS file system and implement read and write functions

Kernel module operation

Kernel (module) management commands:

The function of a module: A program that encapsulates a specific function. For example, Oki Bao. All phones can be flushed.

The target path of the kernel module is stored:

[Email protected]]# ls

3.10.0-229.el7.x86_64 4.2.4

[[Email protected]]# cd/lib/modules/4.2.4/kernel/fs/

[[email protected] fs]# ls

Binfmt_misc.ko ceph dlm fat gfs2 lockd nfs_common NTFS SQUASHFS

Btrfs cifs exofs fscache isofs mbcache.ko nfsd overlayfs UDF

Cachefiles Cramfs ext4 Fuse jbd2 NFS NLS Pstore XFS

[Email protected] fs]# CD fat/

[[email protected] fat] #ls

Fat.ko Msdos.ko Vfat.ko

Insert module:

Insmod

function: Loading Modules

[[email protected] fat] #pwd

/lib/modules/4.2.4/kernel/fs/fat

[[email protected] fat] #insmod Fat.ko

View modules loaded in the current system

#lsmod List Current module

[[email protected] fat] #lsmod | grep fat

Fat 69632 0

Deleting a module

#rmmod Fat # Delete the module. Keep up with the name of the module

[[email protected] fat] #rmmod fat

[[email protected] fat] #lsmod | grep fat

Resolve Dependencies Installation Module

Modprobe

[Email protected] fat]# Insmodvfat.ko

Insmod:ERROR:could Notinsert module Vfat.ko:Unknown symbol in module

[Email protected] fat]# Modprobevfat

[Email protected] fat]# lsmod |grep fat

VFAT 20480 0

Fat 69632 1 VFAT

Deleting a module

[[email protected] fat] #modprobe-R VFAT

[[email protected] fat] #lsmod | grep fat

Once a new module is added, you need to let the system know:

[[email protected] 4.2.4] #depmod

[[email protected] fat] #cd/lib/modules/4.2.4/

[[email protected] 4.2.4] #vim MODULES.DEP

View dependencies between modules: such as fat. As can be seen, the VFAT and MSDOS modules are dependent on the Fat.ko module

File format

Path of the module: dependent module

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View module Information

#modinfo View module Information

[[email protected] fat] #modinfo vfat

FileName:/lib/modules/4.2.4/kernel/fs/fat/vfat.ko

Author:gordon Chaffee

DESCRIPTION:VFAT filesystem Support

License:gpl

Alias:fs-vfat

Srcversion:bef7ba1f8972367dd650aa0

Depends:fat

Intree:y

vermagic:4.2.4 SMP mod_unload modversions

Signer:build Time autogenerated kernel key

Sig_key:d3:5f:6b:f2:8e:bb:94:cd:66:3f:5c:d7:c6:f5:17:68:e9:30:25:b7

sig_hashalgo:sha256

Automatic loading module

[Email protected] ~]# vim/etc/rc.local

#!/bin/bash

# This FILE is Addedfor compatibility purposes

#

# It's highlyadvisable to create own SYSTEMD services or Udev rules

# to run scripts Duringboot instead of the using this file.

#

# In contrast to previousversions due to parallel execution during boot

# This script would notbe run after all other services.

#

# Please note this youmust run ' chmod +x/etc/rc.d/rc.local ' to ensure

# that this script willbe executed during boot.

Touch/var/lock/subsys/local

Modprobe fat

[Email protected] ~]# ll/etc/rc.local

lrwxrwxrwx. 1 root root13 Nov 03:29/etc/rc.local-rc.d/rc.local

Actual combat-Compile an NTFS kernel module to implement Linux mounted NTFS file system

To install fuse:

[[Email protected]]# Rpm-qa | grep fuse

Fuseiso-20070708-15.el7.x86_64

Gvfs-fuse-1.16.4-8.el7.x86_64

Fuse-libs-2.9.2-5.el7.x86_64

Fuse-2.9.2-5.el7.x86_64

[[Email protected] ~] #modprobe NTFS

Compile and install ntfs-3g source package

[Email protected] ~]# TARZXVF ntfs-3g-2011.1.15.tgz

[Email protected] ~]# cdntfs-3g-2011.1.15/

[[email protected] ~]#./configure && make && make install

Import USB flash Drive

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[[Email protected] ~] #umount/DEV/SDC1

[[Email protected] ~] #mount-T ntfs-3g/dev/sdc1/opt/

[Email protected] ~]# Vim/etc/fstab

/dev/sdc1/opt ntfs-3g Defaults

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"Learning God-rhel7" 1-20-1-the operation of the kernel module