1 /* $NetBSD: linux_statfs.h,v 1.7 2019/08/23 13:36:45 maxv Exp $ */
2
3 /*-
4 * Copyright (c) 1995, 1998, 1999 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Frank van der Linden and Eric Haszlakiewicz; by Jason R. Thorpe
9 * of the Numerical Aerospace Simulation Facility, NASA Ames Research Center.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #ifndef _LINUX_STATFS_H
34 #define _LINUX_STATFS_H
35
36 static void __unused bsd_to_linux_statfs(const struct statvfs *,
37 struct linux_statfs *);
38 static void __unused bsd_to_linux_statfs64(const struct statvfs *,
39 struct linux_statfs64 *);
40
41 /*
42 * Convert NetBSD statvfs structure to Linux statfs structure.
43 * Linux doesn't have f_flag, and we can't set f_frsize due
44 * to glibc statvfs() bug (see below).
45 */
46 static void __unused
bsd_to_linux_statfs(const struct statvfs * bsp,struct linux_statfs * lsp)47 bsd_to_linux_statfs(const struct statvfs *bsp, struct linux_statfs *lsp)
48 {
49 int i;
50
51 memset(lsp, 0, sizeof(*lsp));
52
53 for (i = 0; i < linux_fstypes_cnt; i++) {
54 if (strcmp(bsp->f_fstypename, linux_fstypes[i].mty_bsd) == 0) {
55 lsp->l_ftype = linux_fstypes[i].mty_linux;
56 break;
57 }
58 }
59
60 if (i == linux_fstypes_cnt) {
61 lsp->l_ftype = LINUX_DEFAULT_SUPER_MAGIC;
62 }
63
64 /*
65 * The sizes are expressed in number of blocks. The block
66 * size used for the size is f_frsize for POSIX-compliant
67 * statvfs. Linux statfs uses f_bsize as the block size
68 * (f_frsize used to not be available in Linux struct statfs).
69 * However, glibc 2.3.3 statvfs() wrapper fails to adjust the block
70 * counts for different f_frsize if f_frsize is provided by the kernel.
71 * POSIX conforming apps thus get wrong size if f_frsize
72 * is different to f_bsize. Thus, we just pretend we don't
73 * support f_frsize.
74 */
75
76 lsp->l_fbsize = bsp->f_frsize;
77 lsp->l_ffrsize = 0; /* compat */
78 lsp->l_fblocks = bsp->f_blocks;
79 lsp->l_fbfree = bsp->f_bfree;
80 lsp->l_fbavail = bsp->f_bavail;
81 lsp->l_ffiles = bsp->f_files;
82 lsp->l_fffree = bsp->f_ffree;
83 /* Linux sets the fsid to 0..., we don't */
84 lsp->l_ffsid.val[0] = bsp->f_fsidx.__fsid_val[0];
85 lsp->l_ffsid.val[1] = bsp->f_fsidx.__fsid_val[1];
86 lsp->l_fnamelen = bsp->f_namemax;
87 }
88
89 /*
90 * Convert NetBSD statvfs structure to Linux statfs64 structure.
91 * See comments in bsd_to_linux_statfs() for further background.
92 * We can safely pass correct bsize and frsize here, since Linux glibc
93 * statvfs() doesn't use statfs64().
94 */
95 static void __unused
bsd_to_linux_statfs64(const struct statvfs * bsp,struct linux_statfs64 * lsp)96 bsd_to_linux_statfs64(const struct statvfs *bsp, struct linux_statfs64 *lsp)
97 {
98 int i, div;
99
100 memset(lsp, 0, sizeof(*lsp));
101
102 for (i = 0; i < linux_fstypes_cnt; i++) {
103 if (strcmp(bsp->f_fstypename, linux_fstypes[i].mty_bsd) == 0) {
104 lsp->l_ftype = linux_fstypes[i].mty_linux;
105 break;
106 }
107 }
108
109 if (i == linux_fstypes_cnt) {
110 lsp->l_ftype = LINUX_DEFAULT_SUPER_MAGIC;
111 }
112
113 div = bsp->f_frsize ? (bsp->f_bsize / bsp->f_frsize) : 1;
114 if (div == 0)
115 div = 1;
116 lsp->l_fbsize = bsp->f_bsize;
117 lsp->l_ffrsize = bsp->f_frsize;
118 lsp->l_fblocks = bsp->f_blocks / div;
119 lsp->l_fbfree = bsp->f_bfree / div;
120 lsp->l_fbavail = bsp->f_bavail / div;
121 lsp->l_ffiles = bsp->f_files;
122 lsp->l_fffree = bsp->f_ffree / div;
123 /* Linux sets the fsid to 0..., we don't */
124 lsp->l_ffsid.val[0] = bsp->f_fsidx.__fsid_val[0];
125 lsp->l_ffsid.val[1] = bsp->f_fsidx.__fsid_val[1];
126 lsp->l_fnamelen = bsp->f_namemax;
127 }
128
129 #endif /* !_LINUX_STATFS_H */
130