函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\mmap.c Create Date:2022-07-27 16:16:36
Last Modify:2020-03-12 14:18:49 Copyright©Brick
首页 函数Tree
注解内核,赢得工具下载SCCTEnglish

函数名称：ksys_mmap_pgoff

函数原型：unsigned long ksys_mmap_pgoff(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long fd, unsigned long pgoff)

返回类型：unsigned long

参数：

类型参数名称
unsigned longaddr
unsigned longlen
unsigned longprot
unsigned longflags
unsigned longfd
unsigned longpgoff
1559  struct file * file = NULL
1562  如果非flags按位与don't use a file 的值则
1563  audit_mmap_fd(fd, flags)
1564  file等于fget(fd)
1565  如果非file则返回:负EBADF
1567  如果is_file_hugepages(file)则len等于@a is a power of 2 value (len, huge_page_size(hstate_file(file)))
1569  retval等于负EINVAL
1570  如果此条件成立可能性小(为编译器优化)(flags & create a huge page mapping && !is_file_hugepages(file))则转到:out_fput
1572  否则如果flags按位与create a huge page mapping 则
1573  struct user_struct * user = NULL
1576  hs等于hstate_sizelog((flags >> Huge page size encoding when MAP_HUGETLB is specified, and a huge page* size other than the default is desired) & MAP_HUGE_MASK)
1577  如果非hs则返回:负EINVAL
1580  len等于@a is a power of 2 value (len, huge_page_size(hs))
1587  file等于hugetlb_file_setup(HUGETLB_ANON_FILE, len, should the VM suppress accounting , & user, HUGETLB_ANONHUGE_INODE, (flags >> Huge page size encoding when MAP_HUGETLB is specified, and a huge page* size other than the default is desired) & MAP_HUGE_MASK)
1591  如果是错误则返回:错误
1595  flags与等于mark it as an executable 按位或ETXTBSY 的值的反
1597  retval等于vm_mmap_pgoff(file, addr, len, prot, flags, pgoff)
1598  out_fput :
1599  如果file则fput(file)
1601  返回:retval
调用者
名称描述
SYSCALL_DEFINE6
SYSCALL_DEFINE1
SYSCALL_DEFINE6
SYSCALL_DEFINE1