vfs 2

. For example, you should be familiar with super block, dentry, and inode at least, the meaning of data structures such as vfsmount, so that you can read this article for better understanding. 　　 　　 2. Overview of VFS 　　 VFS is a software mechanism. It may be called a Linux File System Administrator. The data structure associated with it only exists in the physic

. This article focuses on explaining the internal mechanism of VFS in Linux kernel through code analysis. In this process, it will involve upper-level file system calls and how to mount the lower-level actual file system. This article attempts to explain the VFS file system mechanism in Linux from a relatively high point of view. Therefore, the description focuses more on the main context of the entire modu

Navigation of this series of articles Apache VFS (1): Basic Introduction Apache VFS (2): file monitoring and monitoring Apache VFS (3): file filter and Selector Apache VFS (4): Events Apache VFS (5): use it! Apache

This series Article Navigation Apache VFS (1): Basic Introduction Apache VFS (2): file monitoring and monitoring Apache VFS (3): file filter and Selector Apache VFS (4): Events Apache VFS (5): use it! Apache

Navigation of this series of articles Apache VFS (1): Basic Introduction Apache VFS (2): file monitoring and monitoring Apache VFS (3): file filter and Selector Apache VFS (4): Events Apache VFS (5): use it! Apache

Navigation of this series of articles Apache VFS (1): Basic Introduction Apache VFS (2): file monitoring and monitoring Apache VFS (3): file filter and Selector Apache VFS (4): Events Apache VFS (5): use it! Apache

Virtual file system, an alias virtual file system switch, is a software layer in Linux that provides a file system operation interface to user space.The system calls that the VFS contains include open (2), stat (2), read (2), write (2), chmod (

; f_op-> release)File-> f_op-> release (inode, file );Security_file_free (File );If (unlikely (s_ischr (inode-> I _mode) inode-> I _cdev! = NULL ))Cdev_put (inode-> I _cdev );Fops_put (file-> f_op );If (file-> f_mode fmode_write)Put_write_access (inode );File_kill (File );File-> f_dentry = NULL;File-> f_vfsmnt = NULL;File_free (File );Dput (dentry );Mntput (mnt );} The fget_light () and fget_light () functions are quick versions of fget () and fput (): the kernel needs to use them on the prem

file objects. The file object represents the open file only in the process view, which in turn points to dentry (which in turn points to the inode), and only the directory entry represents the open actual file. File objects corresponding to the files are not unique, but the corresponding index nodes and directory item objects and files are unique.Filehttp://lxr.free-electrons.com/source/include/linux/fs.h?v=3.11#L765File_operationshttp://lxr.free-electrons.com/source/include/linux/fs.h?v=

1. IntroductionThe series of articles on document management is mainly about the Chen Li of the Document System management Knowledge lecture by teacher June.Linux can support different file systems, which originate from UNIX file systems and are a feature of UNIX file systems.2. Introduction of Virtual File systemThe file system supported by the diagram kernelCat/proc/filesystems can be used to view the current kernel running file system, file system

Currently, in addition to Linux standard file system EXT2/EXT3/EXT4, there are many kinds of file systems, such as ReiserFS, XFS, Windows VFAT NTFS, Network File system NFS and Flash file system JFFS2, yaffs/ YAFFS2 ubifs. Linux provides perfect support for these file systems through the middle tier called VFS. For users, these file systems are almost transparent, and in most cases the user interacts through the libc and kernel

1. Generic file modelLinux The kernel supports loading different file system types, and different file systems have their own way of managing files. The standard file system in Linux is the Ext file System family, and of course, developers cannot use different file access methods for each file system they are using, which runs counter to the operating system as an abstraction mechanism.To support various file systems, theLinux kernel introduces an abstraction layer between the user process (or t

In Windows2003, opencms6.2.3, eclipse3.2, jdk1.5, mysql5.0, MS sqlserver2000 test passed.Opencms VFS pulgin for eclipse is mainly used to access the Virtual File System (VFS) of opencms in eclipse, which facilitates maintenance (creation, editing, copying, and moving) of resources in opencms VFS, delete and publish, I personally think it is mainly JSP development

systems look the same, and this abstraction layer is called the virtual file system (Vfs,virtual Filesystem). In the previous section we described a typical file system storage layout on disk, which we described in the kernel of the runtime file system.3.1. Kernel data structureThe VFS subsystem of the Linux kernel can be illustrated as follows:Maintains the file Status Flag (member f_flags of the file str