1 /* Copyright (C) 1998-2006, 2010 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
5 The GNU C Library is free software; you can redistribute it and/or
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.
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
13 Lesser General Public License for more details.
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
25 #include <stdio_ext.h>
27 #include <sys/mount.h>
29 #include <sys/statfs.h>
30 #include <sys/statvfs.h>
31 #include "linux_fsinfo.h"
32 #include "kernel-features.h"
35 /* Special internal-only bit value. */
36 #define ST_VALID 0x0020
40 # define STATFS statfs
41 # define STATVFS statvfs
42 # define INTERNAL_STATVFS __internal_statvfs
45 # ifndef __ASSUME_STATFS_F_FLAGS
47 __statvfs_getflags (const char *name, int fstype, struct stat64 *st)
52 const char *fsname = NULL;
53 const char *fsname2 = NULL;
54 const char *fsname3 = NULL;
56 /* Map the filesystem type we got from the statfs call to a string. */
59 case EXT2_SUPER_MAGIC:
64 case DEVPTS_SUPER_MAGIC:
67 case SHMFS_SUPER_MAGIC:
70 case PROC_SUPER_MAGIC:
73 case USBDEVFS_SUPER_MAGIC:
76 case AUTOFS_SUPER_MAGIC:
85 case REISERFS_SUPER_MAGIC:
94 case HPFS_SUPER_MAGIC:
97 case DEVFS_SUPER_MAGIC:
100 case ISOFS_SUPER_MAGIC:
103 case MSDOS_SUPER_MAGIC:
106 case NTFS_SUPER_MAGIC:
109 case LOGFS_MAGIC_U32:
112 case BTRFS_SUPER_MAGIC:
115 case CGROUP_SUPER_MAGIC:
120 FILE *mtab = __setmntent ("/proc/mounts", "r");
122 mtab = __setmntent (_PATH_MOUNTED, "r");
127 bool success = false;
128 struct mntent mntbuf;
131 /* No locking needed. */
132 (void) __fsetlocking (mtab, FSETLOCKING_BYCALLER);
135 while (__getmntent_r (mtab, &mntbuf, tmpbuf, sizeof (tmpbuf)))
137 /* In a first round we look for a given mount point, if
139 if (name != NULL && strcmp (name, mntbuf.mnt_dir) != 0)
141 /* We need to look at the entry only if the filesystem
142 name matches. If we have a filesystem name. */
143 else if (fsname != NULL
144 && strcmp (fsname, mntbuf.mnt_type) != 0
146 || strcmp (fsname2, mntbuf.mnt_type) != 0)
148 || strcmp (fsname3, mntbuf.mnt_type) != 0))
151 /* Find out about the device the current entry is for. */
153 if (stat64 (mntbuf.mnt_dir, &fsst) >= 0
154 && st->st_dev == fsst.st_dev)
156 /* Bingo, we found the entry for the device FD is on.
157 Now interpret the option string. */
158 char *cp = mntbuf.mnt_opts;
161 while ((opt = strsep (&cp, ",")) != NULL)
162 if (strcmp (opt, "ro") == 0)
164 else if (strcmp (opt, "nosuid") == 0)
166 else if (strcmp (opt, "noexec") == 0)
168 else if (strcmp (opt, "nodev") == 0)
170 else if (strcmp (opt, "sync") == 0)
171 result |= ST_SYNCHRONOUS;
172 else if (strcmp (opt, "mand") == 0)
173 result |= ST_MANDLOCK;
174 else if (strcmp (opt, "noatime") == 0)
175 result |= ST_NOATIME;
176 else if (strcmp (opt, "nodiratime") == 0)
177 result |= ST_NODIRATIME;
178 else if (strcmp (opt, "relatime") == 0)
179 result |= ST_RELATIME;
181 /* We can stop looking for more entries. */
186 /* Maybe the kernel names for the filesystems changed or the
187 statvfs call got a name which was not the mount point. Check
188 again, this time without checking for name matches first. */
189 if (! success && (name != NULL || fsname != NULL))
192 /* Try without a mount point name. */
196 /* Try without a filesystem name. */
197 assert (fsname != NULL);
198 fsname = fsname2 = fsname3 = NULL;
201 /* It is not strictly allowed to use rewind here. But
202 this code is part of the implementation so it is
209 /* Close the file. */
217 extern int __statvfs_getflags (const char *name, int fstype,
223 INTERNAL_STATVFS (const char *name, struct STATVFS *buf,
224 struct STATFS *fsbuf, struct stat64 *st)
226 /* Now fill in the fields we have information for. */
227 buf->f_bsize = fsbuf->f_bsize;
228 /* Linux has the f_frsize size only in later version of the kernel.
229 If the value is not filled in use f_bsize. */
230 buf->f_frsize = fsbuf->f_frsize ?: fsbuf->f_bsize;
231 buf->f_blocks = fsbuf->f_blocks;
232 buf->f_bfree = fsbuf->f_bfree;
233 buf->f_bavail = fsbuf->f_bavail;
234 buf->f_files = fsbuf->f_files;
235 buf->f_ffree = fsbuf->f_ffree;
236 if (sizeof (buf->f_fsid) == sizeof (fsbuf->f_fsid))
237 buf->f_fsid = ((fsbuf->f_fsid.__val[0]
238 & ((1UL << (8 * sizeof (fsbuf->f_fsid.__val[0]))) - 1))
239 | ((unsigned long int) fsbuf->f_fsid.__val[1]
240 << (8 * (sizeof (buf->f_fsid)
241 - sizeof (fsbuf->f_fsid.__val[0])))));
243 /* We cannot help here. The statvfs element is not large enough to
244 contain both words of the statfs f_fsid field. */
245 buf->f_fsid = fsbuf->f_fsid.__val[0];
246 #ifdef _STATVFSBUF_F_UNUSED
249 buf->f_namemax = fsbuf->f_namelen;
250 memset (buf->__f_spare, '\0', sizeof (buf->__f_spare));
252 /* What remains to do is to fill the fields f_favail and f_flag. */
254 /* XXX I have no idea how to compute f_favail. Any idea??? */
255 buf->f_favail = buf->f_ffree;
257 #ifndef __ASSUME_STATFS_F_FLAGS
258 if ((fsbuf->f_flags & ST_VALID) == 0)
259 /* Determining the flags is tricky. We have to read /proc/mounts or
260 the /etc/mtab file and search for the entry which matches the given
261 file. The way we can test for matching filesystem is using the
263 buf->f_flag = __statvfs_getflags (name, fsbuf->f_type, st);
266 buf->f_flag = fsbuf->f_flags ^ ST_VALID;