1 | /* $NetBSD: linux_statfs.h,v 1.6 2012/09/13 13:59:33 pooka 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 |
47 | bsd_to_linux_statfs(const struct statvfs *bsp, struct linux_statfs *lsp) |
48 | { |
49 | int i; |
50 | |
51 | for (i = 0; i < linux_fstypes_cnt; i++) { |
52 | if (strcmp(bsp->f_fstypename, linux_fstypes[i].mty_bsd) == 0) { |
53 | lsp->l_ftype = linux_fstypes[i].mty_linux; |
54 | break; |
55 | } |
56 | } |
57 | |
58 | if (i == linux_fstypes_cnt) { |
59 | lsp->l_ftype = LINUX_DEFAULT_SUPER_MAGIC; |
60 | } |
61 | |
62 | /* |
63 | * The sizes are expressed in number of blocks. The block |
64 | * size used for the size is f_frsize for POSIX-compliant |
65 | * statvfs. Linux statfs uses f_bsize as the block size |
66 | * (f_frsize used to not be available in Linux struct statfs). |
67 | * However, glibc 2.3.3 statvfs() wrapper fails to adjust the block |
68 | * counts for different f_frsize if f_frsize is provided by the kernel. |
69 | * POSIX conforming apps thus get wrong size if f_frsize |
70 | * is different to f_bsize. Thus, we just pretend we don't |
71 | * support f_frsize. |
72 | */ |
73 | |
74 | lsp->l_fbsize = bsp->f_frsize; |
75 | lsp->l_ffrsize = 0; /* compat */ |
76 | lsp->l_fblocks = bsp->f_blocks; |
77 | lsp->l_fbfree = bsp->f_bfree; |
78 | lsp->l_fbavail = bsp->f_bavail; |
79 | lsp->l_ffiles = bsp->f_files; |
80 | lsp->l_fffree = bsp->f_ffree; |
81 | /* Linux sets the fsid to 0..., we don't */ |
82 | lsp->l_ffsid.val[0] = bsp->f_fsidx.__fsid_val[0]; |
83 | lsp->l_ffsid.val[1] = bsp->f_fsidx.__fsid_val[1]; |
84 | lsp->l_fnamelen = bsp->f_namemax; |
85 | (void)memset(lsp->l_fspare, 0, sizeof(lsp->l_fspare)); |
86 | } |
87 | |
88 | /* |
89 | * Convert NetBSD statvfs structure to Linux statfs64 structure. |
90 | * See comments in bsd_to_linux_statfs() for further background. |
91 | * We can safely pass correct bsize and frsize here, since Linux glibc |
92 | * statvfs() doesn't use statfs64(). |
93 | */ |
94 | static void __unused |
95 | bsd_to_linux_statfs64(const struct statvfs *bsp, struct linux_statfs64 *lsp) |
96 | { |
97 | int i, div; |
98 | |
99 | for (i = 0; i < linux_fstypes_cnt; i++) { |
100 | if (strcmp(bsp->f_fstypename, linux_fstypes[i].mty_bsd) == 0) { |
101 | lsp->l_ftype = linux_fstypes[i].mty_linux; |
102 | break; |
103 | } |
104 | } |
105 | |
106 | if (i == linux_fstypes_cnt) { |
107 | lsp->l_ftype = LINUX_DEFAULT_SUPER_MAGIC; |
108 | } |
109 | |
110 | div = bsp->f_frsize ? (bsp->f_bsize / bsp->f_frsize) : 1; |
111 | if (div == 0) |
112 | div = 1; |
113 | lsp->l_fbsize = bsp->f_bsize; |
114 | lsp->l_ffrsize = bsp->f_frsize; |
115 | lsp->l_fblocks = bsp->f_blocks / div; |
116 | lsp->l_fbfree = bsp->f_bfree / div; |
117 | lsp->l_fbavail = bsp->f_bavail / div; |
118 | lsp->l_ffiles = bsp->f_files; |
119 | lsp->l_fffree = bsp->f_ffree / div; |
120 | /* Linux sets the fsid to 0..., we don't */ |
121 | lsp->l_ffsid.val[0] = bsp->f_fsidx.__fsid_val[0]; |
122 | lsp->l_ffsid.val[1] = bsp->f_fsidx.__fsid_val[1]; |
123 | lsp->l_fnamelen = bsp->f_namemax; |
124 | (void)memset(lsp->l_fspare, 0, sizeof(lsp->l_fspare)); |
125 | } |
126 | |
127 | #endif /* !_LINUX_STATFS_H */ |
128 | |