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/* Copyright (C) 1998-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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, see
<http://www.gnu.org/licenses/>. */
#include <assert.h>
#include <errno.h>
#include <mntent.h>
#include <paths.h>
#include <stdbool.h>
#include <stdio_ext.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/statfs.h>
#include <sys/statvfs.h>
#include "linux_fsinfo.h"
#include <kernel-features.h>
/* Special internal-only bit value. */
#define ST_VALID 0x0020
#ifndef STATFS
# define STATFS statfs
# define STATVFS statvfs
# define INTERNAL_STATVFS __internal_statvfs
# ifndef __ASSUME_STATFS_F_FLAGS
int
__statvfs_getflags (const char *name, int fstype, int fd)
{
struct stat64 st;
if ((fd < 0 ? stat64 (name, &st) : fstat64 (fd, &st)) < 0)
return 0;
const char *fsname = NULL;
const char *fsname2 = NULL;
const char *fsname3 = NULL;
/* Map the filesystem type we got from the statfs call to a string. */
switch (fstype)
{
case EXT2_SUPER_MAGIC:
fsname = "ext4";
fsname2 = "ext3";
fsname3 = "ext2";
break;
case DEVPTS_SUPER_MAGIC:
fsname= "devpts";
break;
case SHMFS_SUPER_MAGIC:
fsname = "tmpfs";
break;
case PROC_SUPER_MAGIC:
fsname = "proc";
break;
case USBDEVFS_SUPER_MAGIC:
fsname = "usbdevfs";
break;
case AUTOFS_SUPER_MAGIC:
fsname = "autofs";
break;
case NFS_SUPER_MAGIC:
fsname = "nfs";
break;
case SYSFS_MAGIC:
fsname = "sysfs";
break;
case REISERFS_SUPER_MAGIC:
fsname = "reiserfs";
break;
case XFS_SUPER_MAGIC:
fsname = "xfs";
break;
case JFS_SUPER_MAGIC:
fsname = "jfs";
break;
case HPFS_SUPER_MAGIC:
fsname = "hpfs";
break;
case DEVFS_SUPER_MAGIC:
fsname = "devfs";
break;
case ISOFS_SUPER_MAGIC:
fsname = "iso9660";
break;
case MSDOS_SUPER_MAGIC:
fsname = "msdos";
break;
case NTFS_SUPER_MAGIC:
fsname = "ntfs";
break;
case LOGFS_MAGIC_U32:
fsname = "logfs";
break;
case BTRFS_SUPER_MAGIC:
fsname = "btrfs";
break;
case CGROUP_SUPER_MAGIC:
fsname = "cgroup";
break;
case LUSTRE_SUPER_MAGIC:
fsname = "lustre";
break;
case F2FS_SUPER_MAGIC:
fsname = "f2fs";
break;
case EFIVARFS_MAGIC:
fsname = "efivarfs";
break;
}
FILE *mtab = __setmntent ("/proc/mounts", "r");
if (mtab == NULL)
mtab = __setmntent (_PATH_MOUNTED, "r");
int result = 0;
if (mtab != NULL)
{
bool success = false;
struct mntent mntbuf;
char tmpbuf[1024];
/* No locking needed. */
(void) __fsetlocking (mtab, FSETLOCKING_BYCALLER);
again:
while (__getmntent_r (mtab, &mntbuf, tmpbuf, sizeof (tmpbuf)))
{
/* In a first round we look for a given mount point, if
we have a name. */
if (name != NULL && strcmp (name, mntbuf.mnt_dir) != 0)
continue;
/* We need to look at the entry only if the filesystem
name matches. If we have a filesystem name. */
else if (fsname != NULL
&& strcmp (fsname, mntbuf.mnt_type) != 0
&& (fsname2 == NULL
|| strcmp (fsname2, mntbuf.mnt_type) != 0)
&& (fsname3 == NULL
|| strcmp (fsname3, mntbuf.mnt_type) != 0))
continue;
/* Find out about the device the current entry is for. */
struct stat64 fsst;
if (stat64 (mntbuf.mnt_dir, &fsst) >= 0
&& st.st_dev == fsst.st_dev)
{
/* Bingo, we found the entry for the device FD is on.
Now interpret the option string. */
char *cp = mntbuf.mnt_opts;
char *opt;
while ((opt = strsep (&cp, ",")) != NULL)
if (strcmp (opt, "ro") == 0)
result |= ST_RDONLY;
else if (strcmp (opt, "nosuid") == 0)
result |= ST_NOSUID;
else if (strcmp (opt, "noexec") == 0)
result |= ST_NOEXEC;
else if (strcmp (opt, "nodev") == 0)
result |= ST_NODEV;
else if (strcmp (opt, "sync") ==
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