mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-05 03:01:05 +00:00
281 lines
7.8 KiB
C
281 lines
7.8 KiB
C
/* Copyright (C) 1998-2017 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") == 0)
|
|
result |= ST_SYNCHRONOUS;
|
|
else if (strcmp (opt, "mand") == 0)
|
|
result |= ST_MANDLOCK;
|
|
else if (strcmp (opt, "noatime") == 0)
|
|
result |= ST_NOATIME;
|
|
else if (strcmp (opt, "nodiratime") == 0)
|
|
result |= ST_NODIRATIME;
|
|
else if (strcmp (opt, "relatime") == 0)
|
|
result |= ST_RELATIME;
|
|
|
|
/* We can stop looking for more entries. */
|
|
success = true;
|
|
break;
|
|
}
|
|
}
|
|
/* Maybe the kernel names for the filesystems changed or the
|
|
statvfs call got a name which was not the mount point. Check
|
|
again, this time without checking for name matches first. */
|
|
if (! success && (name != NULL || fsname != NULL))
|
|
{
|
|
if (name != NULL)
|
|
/* Try without a mount point name. */
|
|
name = NULL;
|
|
else
|
|
{
|
|
/* Try without a filesystem name. */
|
|
assert (fsname != NULL);
|
|
fsname = fsname2 = fsname3 = NULL;
|
|
}
|
|
|
|
/* It is not strictly allowed to use rewind here. But
|
|
this code is part of the implementation so it is
|
|
acceptable. */
|
|
rewind (mtab);
|
|
|
|
goto again;
|
|
}
|
|
|
|
/* Close the file. */
|
|
__endmntent (mtab);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
# endif
|
|
#else
|
|
extern int __statvfs_getflags (const char *name, int fstype, int fd);
|
|
#endif
|
|
|
|
|
|
void
|
|
INTERNAL_STATVFS (const char *name, struct STATVFS *buf,
|
|
struct STATFS *fsbuf, int fd)
|
|
{
|
|
/* Now fill in the fields we have information for. */
|
|
buf->f_bsize = fsbuf->f_bsize;
|
|
/* Linux has the f_frsize size only in later version of the kernel.
|
|
If the value is not filled in use f_bsize. */
|
|
buf->f_frsize = fsbuf->f_frsize ?: fsbuf->f_bsize;
|
|
buf->f_blocks = fsbuf->f_blocks;
|
|
buf->f_bfree = fsbuf->f_bfree;
|
|
buf->f_bavail = fsbuf->f_bavail;
|
|
buf->f_files = fsbuf->f_files;
|
|
buf->f_ffree = fsbuf->f_ffree;
|
|
if (sizeof (buf->f_fsid) == sizeof (fsbuf->f_fsid))
|
|
/* The shifting uses 'unsigned long long int' even though the target
|
|
field might only have 32 bits. This is OK since the 'if' branch
|
|
is not used in this case but the compiler would still generate
|
|
warnings. */
|
|
buf->f_fsid = ((fsbuf->f_fsid.__val[0]
|
|
& ((1ULL << (8 * sizeof (fsbuf->f_fsid.__val[0]))) - 1))
|
|
| ((unsigned long long int) fsbuf->f_fsid.__val[1]
|
|
<< (8 * (sizeof (buf->f_fsid)
|
|
- sizeof (fsbuf->f_fsid.__val[0])))));
|
|
else
|
|
/* We cannot help here. The statvfs element is not large enough to
|
|
contain both words of the statfs f_fsid field. */
|
|
buf->f_fsid = fsbuf->f_fsid.__val[0];
|
|
#ifdef _STATVFSBUF_F_UNUSED
|
|
buf->__f_unused = 0;
|
|
#endif
|
|
buf->f_namemax = fsbuf->f_namelen;
|
|
memset (buf->__f_spare, '\0', sizeof (buf->__f_spare));
|
|
|
|
/* What remains to do is to fill the fields f_favail and f_flag. */
|
|
|
|
/* XXX I have no idea how to compute f_favail. Any idea??? */
|
|
buf->f_favail = buf->f_ffree;
|
|
|
|
#ifndef __ASSUME_STATFS_F_FLAGS
|
|
if ((fsbuf->f_flags & ST_VALID) == 0)
|
|
/* Determining the flags is tricky. We have to read /proc/mounts or
|
|
the /etc/mtab file and search for the entry which matches the given
|
|
file. The way we can test for matching filesystem is using the
|
|
device number. */
|
|
buf->f_flag = __statvfs_getflags (name, fsbuf->f_type, fd);
|
|
else
|
|
#endif
|
|
buf->f_flag = fsbuf->f_flags ^ ST_VALID;
|
|
}
|