Thefile_operationsstructure is defined inlinux/fs.h, andholds pointers to functions defined by the driver that perform various operations on the device. Each field of thestructure corresponds to the address of some function defined by the driver to handle a requested operation. For example, every...
第一个file_operations 成员根本不是一个操作;它是一个指向拥有这个结构的模块的指针.这 个成员用来在它的操作还在被使用时阻止模块被卸载.几乎所有时间中,它被简单初始化为 THIS_MODULE, 一个在<linux/module.h> 中定义的宏. struct module { struct module *next; const char *name; int gpl_compatible; s...
The Linux 0.95 release, which came out in March 1992, brought a number of changes, including a switch to the GPL license. It also added the first pieces of what was to become the kernel's virtual filesystem layer. A core piece of that layer wasthe first file_operations structure, define...
u64 i_version;atomic_ti_count;//引用计数,当引用计数变为0时,会释放inode实例atomic_ti_dio_count;atomic_ti_writecount;//写者计数conststructfile_operations*i_fop;/* former ->i_op->default_file_ops */structfile_lock*i_flock;structaddress_spacei_data;#ifdefCONFIG_QUOTA//创建设备文件的时候i_...
Linux设备文件三大结构:inode,file,file_operations mknod 做了什么事? 进程打开设备文件 驱动如何支持同类型设备? 如何获得注册的设备结构体私有地址? 什么是文件描述符? Linux 中一切都可以看作文件,包括普通文件、链接文件、Socket 以及设备驱动等,对其进行相关操作时,都可能会创建对应的文件描述符。文件描述符(file...
The structure, defined in <linux/fs.h>, is an array of function pointers. Each file is associated with its own set of functions (by including a field called f_op that points to a file_operations structure). The operations are mostly in charge of implementing the system calls and are ...
2. Linux文件系统 Linux将文件系统分为了两层:VFS(虚拟文件系统)、具体文件系统,如下图所示: VFS VFS(Virtual Filesystem Switch)称为虚拟文件系统或虚拟文件系统转换,是一个内核软件层,在具体的文件系统之上抽象的一层,用来处理与Posix文件系统相关的所有调用,表现为能够给各种文件系统提供一个通用的接口,使上层的...
name Name. options Options the container can have. scopeIdentifier Project Id. securityToken Security token of the artifact associated with the container. signingKeyId Identifier of the optional encryption key. size Total size of the files in bytes.Property...
operations take the system from one consistent state to another. For instance, moving a file from one directory to another, which involves create and delete operations, might result in an inconsistent file system state. In particular, a crash might occur while the file is being moved, leading ...
既然我们知道对于不同的文件系统有不同的super_block,那么对于不同的super_block的操作肯定也是不同的,所以我们在下面的super_block结构中可以看到上面说的抽象的struct结构(例如下面的:struct super_operations): (linux内核3.14) 1246 struct super_block {1247 struct list_head s_list; /* Keep this first */...