函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:block\compat_ioctl.c Create Date:2022-07-27 19:36:35
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：compat_hdio_ioctl

函数原型：static int compat_hdio_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)

返回类型：int

参数：

类型参数名称
struct block_device *bdev
fmode_tmode
unsigned intcmd
unsigned longarg
84  __user乘p
87  p等于Allocate user-space memory for the duration of a single system call,* in order to marshall parameters inside a compat thunk.
88  error等于__blkdev_driver_ioctl(bdev, mode, cmd, (unsignedlong)p)
90  如果error恒等于0则
91  __user乘uvp等于A pointer passed in from user mode. This should not* be used for syscall parameters, just declare them* as pointers because the syscall entry code will have* appropriately converted them already.
93  如果Careful: we have to cast the result to the type of the pointer* for sign reasons(v, p)或put_user - Write a simple value into user space(v, uvp)则error等于负EFAULT
96  返回:error
调用者
名称描述
compat_blkdev_driver_ioctl