函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\process_vm_access.c Create Date:2022-07-27 16:31:10
Last Modify:2020-03-17 21:52:24 Copyright©Brick
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函数名称：process_vm_rw_pages - read/write pages from task specified*@pages: array of pointers to pages we want to copy*@offset: offset in page to start copying from/to*@len: number of bytes to copy*@iter: where to copy to/from locally*@vm_write: 0 means copy from,

函数原型：static int process_vm_rw_pages(struct page **pages, unsigned offset, size_t len, struct iov_iter *iter, int vm_write)

返回类型：int

参数：

类型参数名称
struct page **pages
unsignedoffset
size_tlen
struct iov_iter *iter
intvm_write
37  当len且iov_iter_count(iter)循环
38  page等于pages自加
39  copy等于PAGE_SIZE减offset
42  如果copy大于len则copy等于len
45  如果vm_write则
46  copied等于copy_page_from_iter(page, offset, copy, iter)
47  set_page_dirty() is racy if the caller has no reference against* CPU could truncate the page off the mapping and then free the mapping.* Usually, the page _is_ locked, or the caller is a user-space process which
48  否则
49  copied等于copy_page_to_iter(page, offset, copy, iter)
51  len减等于copied
52  如果copied小于copy且iov_iter_count(iter)则返回:负EFAULT
54  offset等于0
56  返回:0
调用者
名称描述
process_vm_rw_single_vecprocess_vm_rw_single_vec - read/write pages from task specified*@addr: start memory address of target process*@len: size of area to copy to/from*@iter: where to copy to/from locally*@process_pages: struct pages area that can store at least*