函数逻辑报告 |
Source Code:fs\userfaultfd.c |
Create Date:2022-07-29 10:52:39 |
Last Modify:2020-03-12 14:18:49 | Copyright©Brick |
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函数名称:userfaultfd_unregister
函数原型:static int userfaultfd_unregister(struct userfaultfd_ctx *ctx, unsigned long arg)
返回类型:int
参数:
类型 | 参数 | 名称 |
---|---|---|
struct userfaultfd_ctx * | ctx | |
unsigned long | arg |
1528 | 如果copy_from_user( & uffdio_unregister, buf, uffdio_unregister的长度)则转到:out |
1531 | ret等于validate_range(mm, & start, len) |
1540 | 如果非mmget_not_zero(mm)则转到:out |
1543 | lock for writing |
1547 | 如果非vma则转到:out_unlock |
1552 | 如果Our start address within vm_mm. 大于等于end则转到:out_unlock |
1559 | 如果is_vm_hugetlb_page(vma)则 |
1560 | vma_hpagesize等于Return the size of the pages allocated when backing a VMA. In the majority* cases this will be same size as used by the page table entries. |
1562 | 如果start按位与vma_hpagesize减1则转到:out_unlock |
1569 | found = false |
1571 | 以cur且Our start address within vm_mm. 小于end循环 |
1572 | cond_resched() |
1574 | BUG_ON(!!ctx ^ !!(Flags, see mm.h. & (missing pages tracking | wrprotect pages tracking ))) |
1584 | 如果非vma_can_userfault(cur)则转到:out_unlock |
1587 | found = true |
1591 | 如果Our start address within vm_mm. 小于start则prev等于vma |
1594 | ret等于0 |
1595 | 循环 |
1596 | cond_resched() |
1598 | BUG_ON(!vma_can_userfault(vma)) |
1607 | WARN_ON(!(Flags, see mm.h. & VM_MAYWRITE)) |
1613 | 如果userfaultfd_missing(vma)则 |
1626 | new_flags等于Flags, see mm.h. 按位与missing pages tracking 按位或wrprotect pages tracking 的值的反 |
1627 | prev等于Given a mapping request (addr,end,vm_flags,file,pgoff), figure out* whether that can be merged with its predecessor or its successor |
1631 | 如果prev则 |
1635 | 如果Our start address within vm_mm. 小于start则 |
1645 | next : |
1651 | Flags, see mm.h. 等于new_flags |
1654 | skip : |
1658 | 当vma且Our start address within vm_mm. 小于end循环 |
1659 | out_unlock : |
1660 | lease a write lock |
1662 | out : |
1663 | 返回:ret |
名称 | 描述 |
---|---|
userfaultfd_ioctl |
源代码转换工具 开放的插件接口 | X |
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支持:c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现:逻辑报告 代码生成和批量转换代码 |