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32c075e1 | 1 | /* Copyright (C) 1998-2003, 2004, 2005 Free Software Foundation, Inc. |
6e9b72d3 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
6e9b72d3 UD |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
6e9b72d3 | 14 | |
41bdb6e2 AJ |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
6e9b72d3 | 19 | |
a14f121d | 20 | #include <assert.h> |
d0501a24 UD |
21 | #include <errno.h> |
22 | #include <mntent.h> | |
23 | #include <paths.h> | |
24 | #include <stdbool.h> | |
25 | #include <stdio_ext.h> | |
26 | #include <string.h> | |
27 | #include <sys/mount.h> | |
28 | #include <sys/stat.h> | |
29 | #include <sys/statfs.h> | |
30 | #include <sys/statvfs.h> | |
31 | #include "linux_fsinfo.h" | |
32 | ||
33 | ||
08c9a553 UD |
34 | #ifndef STATFS |
35 | # define STATFS statfs | |
36 | # define STATVFS statvfs | |
37 | # define INTERNAL_STATVFS __internal_statvfs | |
6016e6f6 UD |
38 | |
39 | ||
40 | int | |
41 | __statvfs_getflags (const char *name, int fstype, struct stat64 *st) | |
42 | { | |
43 | if (st == NULL) | |
44 | return 0; | |
45 | ||
46 | const char *fsname = NULL; | |
47 | const char *fsname2 = NULL; | |
48 | ||
49 | /* Map the filesystem type we got from the statfs call to a string. */ | |
50 | switch (fstype) | |
51 | { | |
52 | case EXT2_SUPER_MAGIC: | |
53 | fsname = "ext3"; | |
54 | fsname2 = "ext2"; | |
55 | break; | |
56 | case DEVPTS_SUPER_MAGIC: | |
57 | fsname= "devpts"; | |
58 | break; | |
59 | case SHMFS_SUPER_MAGIC: | |
60 | fsname = "tmpfs"; | |
61 | break; | |
62 | case PROC_SUPER_MAGIC: | |
63 | fsname = "proc"; | |
64 | break; | |
65 | case USBDEVFS_SUPER_MAGIC: | |
66 | fsname = "usbdevfs"; | |
67 | break; | |
68 | case AUTOFS_SUPER_MAGIC: | |
69 | fsname = "autofs"; | |
70 | break; | |
71 | case NFS_SUPER_MAGIC: | |
72 | fsname = "nfs"; | |
73 | break; | |
00c2b3b9 UD |
74 | case SYSFS_MAGIC: |
75 | fsname = "sysfs"; | |
76 | break; | |
77 | case REISERFS_SUPER_MAGIC: | |
78 | fsname = "reiserfs"; | |
79 | break; | |
80 | case XFS_SUPER_MAGIC: | |
81 | fsname = "xfs"; | |
82 | break; | |
83 | case JFS_SUPER_MAGIC: | |
84 | fsname = "jfs"; | |
85 | break; | |
86 | case HPFS_SUPER_MAGIC: | |
87 | fsname = "hpfs"; | |
88 | break; | |
89 | case DEVFS_SUPER_MAGIC: | |
90 | fsname = "devfs"; | |
91 | break; | |
92 | case ISOFS_SUPER_MAGIC: | |
93 | fsname = "iso9660"; | |
94 | break; | |
95 | case MSDOS_SUPER_MAGIC: | |
96 | fsname = "msdos"; | |
97 | break; | |
98 | case NTFS_SUPER_MAGIC: | |
99 | fsname = "ntfs"; | |
100 | break; | |
6016e6f6 UD |
101 | } |
102 | ||
103 | FILE *mtab = __setmntent ("/proc/mounts", "r"); | |
104 | if (mtab == NULL) | |
105 | mtab = __setmntent (_PATH_MOUNTED, "r"); | |
106 | ||
107 | int result = 0; | |
108 | if (mtab != NULL) | |
109 | { | |
110 | bool success = false; | |
111 | struct mntent mntbuf; | |
112 | char tmpbuf[1024]; | |
113 | ||
114 | /* No locking needed. */ | |
115 | (void) __fsetlocking (mtab, FSETLOCKING_BYCALLER); | |
116 | ||
117 | again: | |
118 | while (__getmntent_r (mtab, &mntbuf, tmpbuf, sizeof (tmpbuf))) | |
119 | { | |
120 | /* In a first round we look for a given mount point, if | |
121 | we have a name. */ | |
122 | if (name != NULL && strcmp (name, mntbuf.mnt_dir) != 0) | |
123 | continue; | |
124 | /* We need to look at the entry only if the filesystem | |
125 | name matches. If we have a filesystem name. */ | |
126 | else if (fsname != NULL | |
127 | && strcmp (fsname, mntbuf.mnt_type) != 0 | |
128 | && (fsname2 == NULL | |
129 | || strcmp (fsname2, mntbuf.mnt_type) != 0)) | |
130 | continue; | |
131 | ||
132 | /* Find out about the device the current entry is for. */ | |
133 | struct stat64 fsst; | |
134 | if (stat64 (mntbuf.mnt_dir, &fsst) >= 0 | |
135 | && st->st_dev == fsst.st_dev) | |
136 | { | |
137 | /* Bingo, we found the entry for the device FD is on. | |
138 | Now interpret the option string. */ | |
139 | char *cp = mntbuf.mnt_opts; | |
140 | char *opt; | |
141 | ||
142 | while ((opt = strsep (&cp, ",")) != NULL) | |
143 | if (strcmp (opt, "ro") == 0) | |
144 | result |= ST_RDONLY; | |
145 | else if (strcmp (opt, "nosuid") == 0) | |
146 | result |= ST_NOSUID; | |
147 | else if (strcmp (opt, "noexec") == 0) | |
148 | result |= ST_NOEXEC; | |
149 | else if (strcmp (opt, "nodev") == 0) | |
150 | result |= ST_NODEV; | |
151 | else if (strcmp (opt, "sync") == 0) | |
152 | result |= ST_SYNCHRONOUS; | |
153 | else if (strcmp (opt, "mand") == 0) | |
154 | result |= ST_MANDLOCK; | |
155 | else if (strcmp (opt, "noatime") == 0) | |
156 | result |= ST_NOATIME; | |
157 | else if (strcmp (opt, "nodiratime") == 0) | |
158 | result |= ST_NODIRATIME; | |
159 | ||
160 | /* We can stop looking for more entries. */ | |
161 | success = true; | |
162 | break; | |
163 | } | |
164 | } | |
165 | /* Maybe the kernel names for the filesystems changed or the | |
166 | statvfs call got a name which was not the mount point. Check | |
167 | again, this time without checking for name matches first. */ | |
168 | if (! success && (name != NULL || fsname != NULL)) | |
169 | { | |
170 | if (name != NULL) | |
171 | /* Try without a mount point name. */ | |
172 | name = NULL; | |
173 | else | |
174 | { | |
175 | /* Try without a filesystem name. */ | |
176 | assert (fsname != NULL); | |
177 | fsname = fsname2 = NULL; | |
178 | } | |
179 | ||
180 | /* It is not strictly allowed to use rewind here. But | |
181 | this code is part of the implementation so it is | |
182 | acceptable. */ | |
183 | rewind (mtab); | |
184 | ||
185 | goto again; | |
186 | } | |
187 | ||
188 | /* Close the file. */ | |
189 | __endmntent (mtab); | |
190 | } | |
191 | ||
192 | return result; | |
193 | } | |
194 | #else | |
195 | extern int __statvfs_getflags (const char *name, int fstype, | |
196 | struct stat64 *st); | |
08c9a553 UD |
197 | #endif |
198 | ||
199 | ||
d0501a24 | 200 | void |
08c9a553 UD |
201 | INTERNAL_STATVFS (const char *name, struct STATVFS *buf, |
202 | struct STATFS *fsbuf, struct stat64 *st) | |
d0501a24 | 203 | { |
6e9b72d3 | 204 | /* Now fill in the fields we have information for. */ |
d0501a24 | 205 | buf->f_bsize = fsbuf->f_bsize; |
51d1ca00 UD |
206 | /* Linux has the f_frsize size only in later version of the kernel. |
207 | If the value is not filled in use f_bsize. */ | |
d0501a24 UD |
208 | buf->f_frsize = fsbuf->f_frsize ?: fsbuf->f_bsize; |
209 | buf->f_blocks = fsbuf->f_blocks; | |
210 | buf->f_bfree = fsbuf->f_bfree; | |
211 | buf->f_bavail = fsbuf->f_bavail; | |
212 | buf->f_files = fsbuf->f_files; | |
213 | buf->f_ffree = fsbuf->f_ffree; | |
214 | if (sizeof (buf->f_fsid) == sizeof (fsbuf->f_fsid)) | |
215 | buf->f_fsid = (fsbuf->f_fsid.__val[0] | |
216 | | ((unsigned long int) fsbuf->f_fsid.__val[1] | |
09a2231b | 217 | << (8 * (sizeof (buf->f_fsid) |
d0501a24 | 218 | - sizeof (fsbuf->f_fsid.__val[0]))))); |
09a2231b UD |
219 | else |
220 | /* We cannot help here. The statvfs element is not large enough to | |
221 | contain both words of the statfs f_fsid field. */ | |
d0501a24 | 222 | buf->f_fsid = fsbuf->f_fsid.__val[0]; |
09a2231b UD |
223 | #ifdef _STATVFSBUF_F_UNUSED |
224 | buf->__f_unused = 0; | |
225 | #endif | |
d0501a24 | 226 | buf->f_namemax = fsbuf->f_namelen; |
6016e6f6 | 227 | memset (buf->__f_spare, '\0', sizeof (buf->__f_spare)); |
6e9b72d3 UD |
228 | |
229 | /* What remains to do is to fill the fields f_favail and f_flag. */ | |
230 | ||
231 | /* XXX I have no idea how to compute f_favail. Any idea??? */ | |
232 | buf->f_favail = buf->f_ffree; | |
233 | ||
234 | /* Determining the flags is tricky. We have to read /proc/mounts or | |
235 | the /etc/mtab file and search for the entry which matches the given | |
236 | file. The way we can test for matching filesystem is using the | |
237 | device number. */ | |
6016e6f6 | 238 | buf->f_flag = __statvfs_getflags (name, fsbuf->f_type, st); |
d0501a24 | 239 | } |