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 19:36:47
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：compat_blkpg_ioctl

函数原型：static int compat_blkpg_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, struct compat_blkpg_ioctl_arg __user *ua32)

返回类型：int

参数：

类型参数名称
struct block_device *bdev
fmode_tmode
unsigned intcmd
struct compat_blkpg_ioctl_arg __user *ua32
187  __user乘a等于Allocate user-space memory for the duration of a single system call,* in order to marshall parameters inside a compat thunk.
192  err等于Careful: we have to cast the result to the type of the pointer* for sign reasons(n, & op)
193  err或等于put_user - Write a simple value into user space(n, & op)
194  err或等于Careful: we have to cast the result to the type of the pointer* for sign reasons(n, & flags)
195  err或等于put_user - Write a simple value into user space(n, & flags)
196  err或等于Careful: we have to cast the result to the type of the pointer* for sign reasons(n, & datalen)
197  err或等于put_user - Write a simple value into user space(n, & datalen)
198  err或等于Careful: we have to cast the result to the type of the pointer* for sign reasons(udata, & data)
199  err或等于put_user - Write a simple value into user space(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., & data)
200  如果err则返回:err
203  返回:always keep this in sync with compat_blkdev_ioctl()
调用者
名称描述
compat_blkdev_ioctlMost of the generic ioctls are handled in the normal fallback path.This assumes the blkdev's low level compat_ioctl always returnsENOIOCTLCMD for unknown ioctls.