1 /* Copyright (C) 1998-2003, 2004, 2005, 2006 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"
35 # define STATFS statfs
36 # define STATVFS statvfs
37 # define INTERNAL_STATVFS __internal_statvfs
41 __statvfs_getflags (const char *name
, int fstype
, struct stat64
*st
)
46 const char *fsname
= NULL
;
47 const char *fsname2
= NULL
;
49 /* Map the filesystem type we got from the statfs call to a string. */
52 case EXT2_SUPER_MAGIC
:
56 case DEVPTS_SUPER_MAGIC
:
59 case SHMFS_SUPER_MAGIC
:
62 case PROC_SUPER_MAGIC
:
65 case USBDEVFS_SUPER_MAGIC
:
68 case AUTOFS_SUPER_MAGIC
:
77 case REISERFS_SUPER_MAGIC
:
86 case HPFS_SUPER_MAGIC
:
89 case DEVFS_SUPER_MAGIC
:
92 case ISOFS_SUPER_MAGIC
:
95 case MSDOS_SUPER_MAGIC
:
98 case NTFS_SUPER_MAGIC
:
103 FILE *mtab
= __setmntent ("/proc/mounts", "r");
105 mtab
= __setmntent (_PATH_MOUNTED
, "r");
110 bool success
= false;
111 struct mntent mntbuf
;
114 /* No locking needed. */
115 (void) __fsetlocking (mtab
, FSETLOCKING_BYCALLER
);
118 while (__getmntent_r (mtab
, &mntbuf
, tmpbuf
, sizeof (tmpbuf
)))
120 /* In a first round we look for a given mount point, if
122 if (name
!= NULL
&& strcmp (name
, mntbuf
.mnt_dir
) != 0)
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
129 || strcmp (fsname2
, mntbuf
.mnt_type
) != 0))
132 /* Find out about the device the current entry is for. */
134 if (stat64 (mntbuf
.mnt_dir
, &fsst
) >= 0
135 && st
->st_dev
== fsst
.st_dev
)
137 /* Bingo, we found the entry for the device FD is on.
138 Now interpret the option string. */
139 char *cp
= mntbuf
.mnt_opts
;
142 while ((opt
= strsep (&cp
, ",")) != NULL
)
143 if (strcmp (opt
, "ro") == 0)
145 else if (strcmp (opt
, "nosuid") == 0)
147 else if (strcmp (opt
, "noexec") == 0)
149 else if (strcmp (opt
, "nodev") == 0)
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 else if (strcmp (opt
, "relatime") == 0)
160 result
|= ST_RELATIME
;
162 /* We can stop looking for more entries. */
167 /* Maybe the kernel names for the filesystems changed or the
168 statvfs call got a name which was not the mount point. Check
169 again, this time without checking for name matches first. */
170 if (! success
&& (name
!= NULL
|| fsname
!= NULL
))
173 /* Try without a mount point name. */
177 /* Try without a filesystem name. */
178 assert (fsname
!= NULL
);
179 fsname
= fsname2
= NULL
;
182 /* It is not strictly allowed to use rewind here. But
183 this code is part of the implementation so it is
190 /* Close the file. */
197 extern int __statvfs_getflags (const char *name
, int fstype
,
203 INTERNAL_STATVFS (const char *name
, struct STATVFS
*buf
,
204 struct STATFS
*fsbuf
, struct stat64
*st
)
206 /* Now fill in the fields we have information for. */
207 buf
->f_bsize
= fsbuf
->f_bsize
;
208 /* Linux has the f_frsize size only in later version of the kernel.
209 If the value is not filled in use f_bsize. */
210 buf
->f_frsize
= fsbuf
->f_frsize
?: fsbuf
->f_bsize
;
211 buf
->f_blocks
= fsbuf
->f_blocks
;
212 buf
->f_bfree
= fsbuf
->f_bfree
;
213 buf
->f_bavail
= fsbuf
->f_bavail
;
214 buf
->f_files
= fsbuf
->f_files
;
215 buf
->f_ffree
= fsbuf
->f_ffree
;
216 if (sizeof (buf
->f_fsid
) == sizeof (fsbuf
->f_fsid
))
217 buf
->f_fsid
= (fsbuf
->f_fsid
.__val
[0]
218 | ((unsigned long int) fsbuf
->f_fsid
.__val
[1]
219 << (8 * (sizeof (buf
->f_fsid
)
220 - sizeof (fsbuf
->f_fsid
.__val
[0])))));
222 /* We cannot help here. The statvfs element is not large enough to
223 contain both words of the statfs f_fsid field. */
224 buf
->f_fsid
= fsbuf
->f_fsid
.__val
[0];
225 #ifdef _STATVFSBUF_F_UNUSED
228 buf
->f_namemax
= fsbuf
->f_namelen
;
229 memset (buf
->__f_spare
, '\0', sizeof (buf
->__f_spare
));
231 /* What remains to do is to fill the fields f_favail and f_flag. */
233 /* XXX I have no idea how to compute f_favail. Any idea??? */
234 buf
->f_favail
= buf
->f_ffree
;
236 /* Determining the flags is tricky. We have to read /proc/mounts or
237 the /etc/mtab file and search for the entry which matches the given
238 file. The way we can test for matching filesystem is using the
240 buf
->f_flag
= __statvfs_getflags (name
, fsbuf
->f_type
, st
);