1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
|
/* Get file-specific information about a file. Linux version.
Copyright (C) 1991,1995,1996,1998-2003,2008,2010,2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <unistd.h>
#include <errno.h>
#include "pathconf.h"
#include "linux_fsinfo.h"
#include <not-cancel.h>
static long int posix_pathconf (const char *file, int name);
/* Define this first, so it can be inlined. */
#define __pathconf static posix_pathconf
#include <sysdeps/posix/pathconf.c>
/* Get file-specific information about FILE. */
long int
__pathconf (const char *file, int name)
{
struct statfs fsbuf;
int fd;
int flags;
switch (name)
{
case _PC_LINK_MAX:
return __statfs_link_max (__statfs (file, &fsbuf), &fsbuf);
case _PC_FILESIZEBITS:
return __statfs_filesize_max (__statfs (file, &fsbuf), &fsbuf);
case _PC_2_SYMLINKS:
return __statfs_symlinks (__statfs (file, &fsbuf), &fsbuf);
case _PC_CHOWN_RESTRICTED:
return __statfs_chown_restricted (__statfs (file, &fsbuf), &fsbuf);
case _PC_PIPE_BUF:
flags = O_RDONLY|O_NONBLOCK|O_NOCTTY;
#ifdef O_CLOEXEC
flags |= O_CLOEXEC;
#endif
fd = open_not_cancel_2 (file, flags);
if (fd >= 0)
{
long int r = __fcntl (fd, F_GETPIPE_SZ);
close_not_cancel_no_status (fd);
if (r > 0)
return r;
}
/* FALLTHROUGH */
default:
return posix_pathconf (file, name);
}
}
/* Used like: return statfs_link_max (__statfs (name, &buf), &buf); */
long int
__statfs_link_max (int result, const struct statfs *fsbuf)
{
if (result < 0)
{
if (errno == ENOSYS)
/* Not possible, return the default value. */
return LINUX_LINK_MAX;
/* Some error occured. */
return -1;
}
switch (fsbuf->f_type)
{
case EXT2_SUPER_MAGIC:
return EXT2_LINK_MAX;
case MINIX_SUPER_MAGIC:
case MINIX_SUPER_MAGIC2:
return MINIX_LINK_MAX;
case MINIX2_SUPER_MAGIC:
case MINIX2_SUPER_MAGIC2:
return MINIX2_LINK_MAX;
case XENIX_SUPER_MAGIC:
return XENIX_LINK_MAX;
case SYSV4_SUPER_MAGIC:
case SYSV2_SUPER_MAGIC:
return SYSV_LINK_MAX;
case COH_SUPER_MAGIC:
return COH_LINK_MAX;
case UFS_MAGIC:
case UFS_CIGAM:
return UFS_LINK_MAX;
case REISERFS_SUPER_MAGIC:
return REISERFS_LINK_MAX;
case XFS_SUPER_MAGIC:
return XFS_LINK_MAX;
default:
return LINUX_LINK_MAX;
}
}
/* Used like: return statfs_filesize_max (__statfs (name, &buf), &buf); */
long int
__statfs_filesize_max (int result, const struct statfs *fsbuf)
{
if (result < 0)
{
if (errno == ENOSYS)
/* Not possible, return the default value. */
return 32;
/* Some error occured. */
return -1;
}
switch (fsbuf->f_type)
{
case BTRFS_SUPER_MAGIC:
return 255;
case EXT2_SUPER_MAGIC:
case UFS_MAGIC:
case UFS_CIGAM:
case REISERFS_SUPER_MAGIC:
case XFS_SUPER_MAGIC:
case SMB_SUPER_MAGIC:
case NTFS_SUPER_MAGIC:
case UDF_SUPER_MAGIC:
case JFS_SUPER_MAGIC:
case VXFS_SUPER_MAGIC:
case CGROUP_SUPER_MAGIC:
return 64;
case MSDOS_SUPER_MAGIC:
case JFFS_SUPER_MAGIC:
case JFFS2_SUPER_MAGIC:
case NCP_SUPER_MAGIC:
case ROMFS_SUPER_MAGIC:
return 32;
default:
return 32;
}
}
/* Used like: return statfs_link_max (__statfs (name, &buf), &buf); */
long int
__statfs_symlinks (int result, const struct statfs *fsbuf)
{
if (result < 0)
{
if (errno == ENOSYS)
/* Not possible, return the default value. */
return 1;
/* Some error occured. */
return -1;
}
switch (fsbuf->f_type)
{
case ADFS_SUPER_MAGIC:
case BFS_MAGIC:
case CRAMFS_MAGIC:
case DEVPTS_SUPER_MAGIC:
case EFS_SUPER_MAGIC:
case EFS_MAGIC:
case MSDOS_SUPER_MAGIC:
case NTFS_SUPER_MAGIC:
case QNX4_SUPER_MAGIC:
case ROMFS_SUPER_MAGIC:
/* No symlink support. */
return 0;
default:
return 1;
}
}
/* Used like: return __statfs_chown_restricted (__statfs (name, &buf), &buf);*/
long int
__statfs_chown_restricted (int result, const struct statfs *fsbuf)
{
if (result < 0)
{
if (errno == ENOSYS)
/* Not possible, return the default value. */
return 1;
/* Some error occured. */
return -1;
}
int fd;
long int retval = 1;
switch (fsbuf->f_type)
{
case XFS_SUPER_MAGIC:
/* Read the value from /proc/sys/fs/xfs/restrict_chown. If we cannot
read it default to assume the restriction is in place. */
fd = open_not_cancel_2 ("/proc/sys/fs/xfs/restrict_chown", O_RDONLY);
if (fd != -1)
{
char buf[2];
if (TEMP_FAILURE_RETRY (read_not_cancel (fd, buf, 2)) == 2
&& buf[0] >= '0' && buf[0] <= '1')
retval = buf[0] - '0';
close_not_cancel_no_status (fd);
}
break;
default:
break;
}
return retval;
}
|
