4、ssize_t (*write) 向设备同步发送数据,也就是写节点。 5、ssize_t (*read_iter) 初始化一个异步读。可能在函数返回前不结束的读操作。如果这个方法是 NULL,所有的操作会由 read 代替进行(同步)。 6、ssize_t (*write_iter) 初始化一个异步写。 7、int (*iterate) 迭代 8、int (*iterate_shared)...
像一般删除内核代码一样,删除file_operations成员的情况很少见,但 在所有用户转而使用aio_read()和 aio_write()后, readv()和writev()在 2.6.19 中被 删除。 struct file_operations的 3.16 版本已增加到 27 个成员,其中添加的成员表明内核中采用了新的 I/O 方法: ssize_t (*read_iter) (struct kiocb *...
struct file_operations{struct module*owner;loff_t(*llseek)(struct file*,loff_t,int);ssize_t(*read)(struct file*,char __user*,size_t,loff_t*);ssize_t(*write)(struct file*,constchar __user*,size_t,loff_t*);ssize_t(*read_iter)(struct kiocb*,struct iov_iter*);ssize_t(*write_i...
ext4_file_operations const struct file_operations ext4_file_operations = { .llseek = ext4_llseek, .read_iter = generic_file_read_iter, .write_iter = ext4_file_write_iter, .unlocked_ioctl = ext4_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = ext4_compat_ioctl, #endif .mmap = ext4_file_mm...
File_operations结构体 内核中file_operations源码 linux-2.6.22.6 /include/linux/fs.h 具体内容在最后 //code from : linux2.6.22.6 /* * NOTE: * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl * can be called without the big kernel lock held in all filesystems....
检查file_operations结构体的总大小(IDA拖进去后按Shift+F7,找到.rodata字段,搜索文本this_module) 2.检查write_iter与iterate之间有新增函数(Linux内核源码里include/linux/fs.h,file_operations) 3.检查unlocked_ioctl与compat_ioctl的偏移是否对齐 4.检查open与release的偏移是否对齐 */ #ifdef MY_CUSTOM_FILE_...
file_operations结构体的成员变量向应用程序提供一个对设备操作的接口,但是接口的具体操作需要我们自己来实现。打开上一章所写的驱动源代码"shanwuyan.c",定义一个"file_operations"类型的结构体,再定义四个函数"shanwuyan_open"、"shanwuyan_release"、"shanwuyan_read"、"shanwuyan_write",让file_operations结构...
This allows you to do many independent IO operations on an once open file without moving the virtual carriage. For example, you may make 10 concurrent HTTP requests by specifying the Range header, and asynchronously write one opened file, while the offsets must either be calculated manually, or...
yes checking if 'file_operations.read|write_iter' exist... no checking if struct key_match field exist... no checking if percpu_counter_init uses GFP_* flag as argument... yes checking if filldir_t uses struct dir_context... no checking if struct kiocb has ki_nbytes field... no ...
Hi all!I have some weird bug with Firefly-RK3399 board: kernel suddenly crashes on large file operations (starting from 300Mb). I had this with different kern ... Kernel crash on large file operations ,Firefly Open Source Community