1/*
2 * Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24#ifndef OS_CPU_LINUX_X86_GC_Z_ZBACKINGFILE_LINUX_X86_HPP
25#define OS_CPU_LINUX_X86_GC_Z_ZBACKINGFILE_LINUX_X86_HPP
26
27#include "memory/allocation.hpp"
28
29class ZErrno;
30
31class ZBackingFile {
32private:
33 int _fd;
34 size_t _size;
35 uint64_t _filesystem;
36 size_t _block_size;
37 size_t _available;
38 bool _initialized;
39
40 int create_mem_fd(const char* name) const;
41 int create_file_fd(const char* name) const;
42 int create_fd(const char* name) const;
43
44 bool is_tmpfs() const;
45 bool is_hugetlbfs() const;
46 bool tmpfs_supports_transparent_huge_pages() const;
47
48 ZErrno fallocate_compat_ftruncate(size_t size) const;
49 ZErrno fallocate_compat_mmap(size_t offset, size_t length, bool reserve_only) const;
50 ZErrno fallocate_compat_pwrite(size_t offset, size_t length) const;
51 ZErrno fallocate_fill_hole_compat(size_t offset, size_t length);
52 ZErrno fallocate_fill_hole_syscall(size_t offset, size_t length);
53 ZErrno fallocate_fill_hole(size_t offset, size_t length);
54 ZErrno fallocate_punch_hole(size_t offset, size_t length);
55 ZErrno split_and_fallocate(bool punch_hole, size_t offset, size_t length);
56 ZErrno fallocate(bool punch_hole, size_t offset, size_t length);
57
58 bool commit_inner(size_t offset, size_t length);
59
60public:
61 ZBackingFile();
62
63 bool is_initialized() const;
64
65 int fd() const;
66 size_t size() const;
67 size_t available() const;
68
69 size_t commit(size_t offset, size_t length);
70 size_t uncommit(size_t offset, size_t length);
71};
72
73#endif // OS_CPU_LINUX_X86_GC_Z_ZBACKINGFILE_LINUX_X86_HPP
74