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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <sys/statvfs.h>
#include <sys/statfs.h>
// Paper over the fact that 32-bit kernels use fstatfs64/statfs64 with an extra argument,
// but 64-bit kernels don't have the "64" bit suffix or the extra size_t argument.
#if defined(__LP64__)
extern "C" int __fstatfs(int, struct statfs*);
extern "C" int __statfs(const char*, struct statfs*);
# define __fstatfs64(fd,size,buf) __fstatfs(fd,buf)
# define __statfs64(path,size,buf) __statfs(path,buf)
#else
extern "C" int __fstatfs64(int, size_t, struct statfs*);
extern "C" int __statfs64(const char*, size_t, struct statfs*);
#endif
// The kernel sets a private ST_VALID flag to signal to the C library whether the
// f_flags field is valid. This flag should not be exposed to users of the C library.
#define ST_VALID 0x0020
static void __statfs_to_statvfs(const struct statfs& in, struct statvfs* out) {
out->f_bsize = in.f_bsize;
out->f_frsize = in.f_frsize;
out->f_blocks = in.f_blocks;
out->f_bfree = in.f_bfree;
out->f_bavail = in.f_bavail;
out->f_files = in.f_files;
out->f_ffree = in.f_ffree;
out->f_favail = in.f_ffree;
out->f_fsid = in.f_fsid.__val[0] | (static_cast<uint64_t>(in.f_fsid.__val[1]) << 32);
out->f_flag = in.f_flags;
out->f_namemax = in.f_namelen;
}
int fstatfs(int fd, struct statfs* result) {
int rc = __fstatfs64(fd, sizeof(*result), result);
if (rc != 0) {
return rc;
}
result->f_flags &= ~ST_VALID;
return 0;
}
__strong_alias(fstatfs64, fstatfs);
int statfs(const char* path, struct statfs* result) {
int rc = __statfs64(path, sizeof(*result), result);
if (rc != 0) {
return rc;
}
result->f_flags &= ~ST_VALID;
return 0;
}
__strong_alias(statfs64, statfs);
int statvfs(const char* path, struct statvfs* result) {
struct statfs tmp;
int rc = statfs(path, &tmp);
if (rc != 0) {
return rc;
}
__statfs_to_statvfs(tmp, result);
return 0;
}
__strong_alias(statvfs64, statvfs);
int fstatvfs(int fd, struct statvfs* result) {
struct statfs tmp;
int rc = fstatfs(fd, &tmp);
if (rc != 0) {
return rc;
}
__statfs_to_statvfs(tmp, result);
return 0;
}
__strong_alias(fstatvfs64, fstatvfs);
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