参照元

説明

引数

返り値

参考

実装

SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len,
                unsigned long, prot, unsigned long, flags,
                unsigned long, fd, unsigned long, pgoff)
{
        struct file *file = NULL;
        unsigned long retval;
        if (!(flags & MAP_ANONYMOUS)) {
                audit_mmap_fd(fd, flags);
                file = fget(fd);
                if (!file)
                        return -EBADF;
                if (is_file_hugepages(file))
                        len = ALIGN(len, huge_page_size(hstate_file(file)));
                retval = -EINVAL;
                if (unlikely(flags & MAP_HUGETLB && !is_file_hugepages(file)))
                        goto out_fput;
        } else if (flags & MAP_HUGETLB) {
                struct user_struct *user = NULL;
                struct hstate *hs;
                hs = hstate_sizelog((flags >> MAP_HUGE_SHIFT) & SHM_HUGE_MASK);
                if (!hs)
                        return -EINVAL;
                len = ALIGN(len, huge_page_size(hs));
                /*
                 * VM_NORESERVE is used because the reservations will be
                 * taken when vm_ops->mmap() is called
                 * A dummy user value is used because we are not locking
                 * memory so no accounting is necessary
                 */
                file = hugetlb_file_setup(HUGETLB_ANON_FILE, len,
                                VM_NORESERVE,
                                &user, HUGETLB_ANONHUGE_INODE,
                                (flags >> MAP_HUGE_SHIFT) & MAP_HUGE_MASK);
                if (IS_ERR(file))
                        return PTR_ERR(file);
        }

        flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);

        retval = vm_mmap_pgoff(file, addr, len, prot, flags, pgoff);
out_fput:
        if (file)
                fput(file);
        return retval;
}

コメント


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Last-modified: 2016-03-15 (火) 10:57:26