1/*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <sys/statvfs.h>
18
19#include <sys/statfs.h>
20
21// Paper over the fact that 32-bit kernels use fstatfs64/statfs64 with an extra argument,
22// but 64-bit kernels don't have the "64" bit suffix or the extra size_t argument.
23#if __LP64__
24#  define __fstatfs64(fd,size,buf) fstatfs(fd,buf)
25#  define __statfs64(path,size,buf) statfs(path,buf)
26#else
27extern "C" int __fstatfs64(int, size_t, struct statfs*);
28extern "C" int __statfs64(const char*, size_t, struct statfs*);
29#endif
30
31#define ST_VALID 0x0020
32
33static void __statfs_to_statvfs(const struct statfs& in, struct statvfs* out) {
34  out->f_bsize = in.f_bsize;
35  out->f_frsize = in.f_frsize;
36  out->f_blocks = in.f_blocks;
37  out->f_bfree = in.f_bfree;
38  out->f_bavail = in.f_bavail;
39  out->f_files = in.f_files;
40  out->f_ffree = in.f_ffree;
41  out->f_favail = in.f_ffree;
42  out->f_fsid = in.f_fsid.__val[0] | (static_cast<uint64_t>(in.f_fsid.__val[1]) << 32);
43  out->f_flag = in.f_flags & ~ST_VALID;
44  out->f_namemax = in.f_namelen;
45}
46
47int statvfs(const char* path, struct statvfs* result) {
48  struct statfs tmp;
49  int rc = __statfs64(path, sizeof(tmp), &tmp);
50  if (rc != 0) {
51    return rc;
52  }
53  __statfs_to_statvfs(tmp, result);
54  return 0;
55}
56__strong_alias(statvfs64, statvfs);
57
58int fstatvfs(int fd, struct statvfs* result) {
59  struct statfs tmp;
60  int rc = __fstatfs64(fd, sizeof(tmp), &tmp);
61  if (rc != 0) {
62    return rc;
63  }
64  __statfs_to_statvfs(tmp, result);
65  return 0;
66}
67__strong_alias(fstatvfs64, fstatvfs);
68