1 /* Copyright (C) 1998-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <sys/statfs.h>
19 #include <sys/statvfs.h>
20 #include <internal_statvfs.h>
21 #include <string.h>
22 #include <time.h>
23 #include <kernel_stat.h>
24
25 /* Special internal-only bit value. */
26 # define ST_VALID 0x0020
27
28 #if !STATFS_IS_STATFS64
29 void
30 __internal_statvfs (struct statvfs *buf, const struct statfs *fsbuf)
31 {
32 /* Now fill in the fields we have information for. */
33 buf->f_bsize = fsbuf->f_bsize;
34 /* Linux has the f_frsize size only in later version of the kernel.
35 If the value is not filled in use f_bsize. */
36 buf->f_frsize = fsbuf->f_frsize ?: fsbuf->f_bsize;
37 buf->f_blocks = fsbuf->f_blocks;
38 buf->f_bfree = fsbuf->f_bfree;
39 buf->f_bavail = fsbuf->f_bavail;
40 buf->f_files = fsbuf->f_files;
41 buf->f_ffree = fsbuf->f_ffree;
42 if (sizeof (buf->f_fsid) == sizeof (fsbuf->f_fsid))
43 /* The shifting uses 'unsigned long long int' even though the target
44 field might only have 32 bits. This is OK since the 'if' branch
45 is not used in this case but the compiler would still generate
46 warnings. */
47 buf->f_fsid = ((fsbuf->f_fsid.__val[0]
48 & ((1ULL << (8 * sizeof (fsbuf->f_fsid.__val[0]))) - 1))
49 | ((unsigned long long int) fsbuf->f_fsid.__val[1]
50 << (8 * (sizeof (buf->f_fsid)
51 - sizeof (fsbuf->f_fsid.__val[0])))));
52 else
53 /* We cannot help here. The statvfs element is not large enough to
54 contain both words of the statfs f_fsid field. */
55 buf->f_fsid = fsbuf->f_fsid.__val[0];
56 #ifdef _STATVFSBUF_F_UNUSED
57 buf->__f_unused = 0;
58 #endif
59 buf->f_namemax = fsbuf->f_namelen;
60 memset (buf->__f_spare, '\0', sizeof (buf->__f_spare));
61
62 /* What remains to do is to fill the fields f_favail and f_flag. */
63
64 /* XXX I have no idea how to compute f_favail. Any idea??? */
65 buf->f_favail = buf->f_ffree;
66
67 buf->f_flag = fsbuf->f_flags ^ ST_VALID;
68 }
69 #endif
70
71 void
72 __internal_statvfs64 (struct statvfs64 *buf, const struct statfs64 *fsbuf)
73 {
74 /* Now fill in the fields we have information for. */
75 buf->f_bsize = fsbuf->f_bsize;
76 /* Linux has the f_frsize size only in later version of the kernel.
77 If the value is not filled in use f_bsize. */
78 buf->f_frsize = fsbuf->f_frsize ?: fsbuf->f_bsize;
79 buf->f_blocks = fsbuf->f_blocks;
80 buf->f_bfree = fsbuf->f_bfree;
81 buf->f_bavail = fsbuf->f_bavail;
82 buf->f_files = fsbuf->f_files;
83 buf->f_ffree = fsbuf->f_ffree;
84 if (sizeof (buf->f_fsid) == sizeof (fsbuf->f_fsid))
85 /* The shifting uses 'unsigned long long int' even though the target
86 field might only have 32 bits. This is OK since the 'if' branch
87 is not used in this case but the compiler would still generate
88 warnings. */
89 buf->f_fsid = ((fsbuf->f_fsid.__val[0]
90 & ((1ULL << (8 * sizeof (fsbuf->f_fsid.__val[0]))) - 1))
91 | ((unsigned long long int) fsbuf->f_fsid.__val[1]
92 << (8 * (sizeof (buf->f_fsid)
93 - sizeof (fsbuf->f_fsid.__val[0])))));
94 else
95 /* We cannot help here. The statvfs element is not large enough to
96 contain both words of the statfs f_fsid field. */
97 buf->f_fsid = fsbuf->f_fsid.__val[0];
98 #ifdef _STATVFSBUF_F_UNUSED
99 buf->__f_unused = 0;
100 #endif
101 buf->f_namemax = fsbuf->f_namelen;
102 memset (buf->__f_spare, '\0', sizeof (buf->__f_spare));
103
104 /* What remains to do is to fill the fields f_favail and f_flag. */
105
106 /* XXX I have no idea how to compute f_favail. Any idea??? */
107 buf->f_favail = buf->f_ffree;
108
109 buf->f_flag = fsbuf->f_flags ^ ST_VALID;
110 }