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 extern "C" int __fstatfs(int, struct statfs*);
25 extern "C" int __statfs(const char*, struct statfs*);
26 # define __fstatfs64(fd,size,buf) __fstatfs(fd,buf)
27 # define __statfs64(path,size,buf) __statfs(path,buf)
28 #else
29 extern "C" int __fstatfs64(int, size_t, struct statfs*);
30 extern "C" int __statfs64(const char*, size_t, struct statfs*);
31 #endif
32
33 // The kernel sets a private ST_VALID flag to signal to the C library whether the
34 // f_flags field is valid. This flag should not be exposed to users of the C library.
35 #define ST_VALID 0x0020
36
__statfs_to_statvfs(const struct statfs & in,struct statvfs * out)37 static void __statfs_to_statvfs(const struct statfs& in, struct statvfs* out) {
38 out->f_bsize = in.f_bsize;
39 out->f_frsize = in.f_frsize;
40 out->f_blocks = in.f_blocks;
41 out->f_bfree = in.f_bfree;
42 out->f_bavail = in.f_bavail;
43 out->f_files = in.f_files;
44 out->f_ffree = in.f_ffree;
45 out->f_favail = in.f_ffree;
46 out->f_fsid = in.f_fsid.__val[0] | (static_cast<uint64_t>(in.f_fsid.__val[1]) << 32);
47 out->f_flag = in.f_flags;
48 out->f_namemax = in.f_namelen;
49 }
50
fstatfs(int fd,struct statfs * result)51 int fstatfs(int fd, struct statfs* result) {
52 int rc = __fstatfs64(fd, sizeof(*result), result);
53 if (rc != 0) {
54 return rc;
55 }
56 result->f_flags &= ~ST_VALID;
57 return 0;
58 }
59 __strong_alias(fstatfs64, fstatfs);
60
statfs(const char * path,struct statfs * result)61 int statfs(const char* path, struct statfs* result) {
62 int rc = __statfs64(path, sizeof(*result), result);
63 if (rc != 0) {
64 return rc;
65 }
66 result->f_flags &= ~ST_VALID;
67 return 0;
68 }
69 __strong_alias(statfs64, statfs);
70
statvfs(const char * path,struct statvfs * result)71 int statvfs(const char* path, struct statvfs* result) {
72 struct statfs tmp;
73 int rc = statfs(path, &tmp);
74 if (rc != 0) {
75 return rc;
76 }
77 __statfs_to_statvfs(tmp, result);
78 return 0;
79 }
80 __strong_alias(statvfs64, statvfs);
81
fstatvfs(int fd,struct statvfs * result)82 int fstatvfs(int fd, struct statvfs* result) {
83 struct statfs tmp;
84 int rc = fstatfs(fd, &tmp);
85 if (rc != 0) {
86 return rc;
87 }
88 __statfs_to_statvfs(tmp, result);
89 return 0;
90 }
91 __strong_alias(fstatvfs64, fstatvfs);
92