__access_remote_vm

函数名称：__access_remote_vm

函数原型：int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm, unsigned long addr, void *buf, int len, unsigned int gup_flags)

返回类型：int

参数：

类型	参数	名称
struct task_struct *	tsk
struct mm_struct *	mm
unsigned long	addr
void *	buf
int	len
unsigned int	gup_flags

1712

write等于gup_flags按位与check pte is writable

1714

如果down_read_killable( & mmap_sem)则返回:0

1718

vma等于Look up the first VMA which satisfies addr < vm_end, NULL if none.

1719

如果vma则

1721

如果addr加len大于等于The first byte after our end addresswithin vm_mm. 则len等于The first byte after our end addresswithin vm_mm. 减addr

1725

如果write且Flags, see mm.h. 按位与VM_MAYWRITE则copy_to_user_page(vma, NULL, addr, (void * )addr, buf, len)

1728

否则如果非write且Flags, see mm.h. 按位与limits for mprotect() etc 则copy_from_user_page(vma, NULL, addr, buf, (void * )addr, len)

1731

否则len等于0

1733

否则

1734

len等于0

1737

lease a read lock

1739

返回:len

**调用者**
名称	描述
access_remote_vm	access_remote_vm - access another process' address space@mm: the mm_struct of the target address space@addr: start address to access@buf: source or destination buffer@len: number of bytes to transfer*@gup_flags: flags modifying lookup behaviour
access_process_vm	Access another process' address space.* - source/target buffer must be kernel space
ptrace_access_vm	Access another process' address space via ptrace.* Source/target buffer must be kernel space,* Do not walk the page table directly, use get_user_pages
access_remote_vm	access_remote_vm - access another process' address space@mm: the mm_struct of the target address space@addr: start address to access@buf: source or destination buffer@len: number of bytes to transfer*@gup_flags: flags modifying lookup behaviour
access_process_vm	Access another process' address space.* Source/target buffer must be kernel space,* Do not walk the page table directly, use get_user_pages

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