/*
* ismounted.c --- Check to see if the filesystem was mounted
- *
+ *
* Copyright (C) 1995,1996,1997,1998,1999,2000 Theodore Ts'o.
*
* %Begin-Header%
- * This file may be redistributed under the terms of the GNU Public
- * License.
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
* %End-Header%
*/
+/* define BSD_SOURCE to make sure we get the major() macro */
+#ifndef _BSD_SOURCE
+#define _BSD_SOURCE
+#endif
+#ifndef _DEFAULT_SOURCE
+#define _DEFAULT_SOURCE /* since glibc 2.20 _SVID_SOURCE is deprecated */
+#endif
+
+#include "config.h"
#include <stdio.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#ifdef HAVE_LINUX_FD_H
#include <linux/fd.h>
#endif
+#ifdef HAVE_LINUX_LOOP_H
+#include <linux/loop.h>
+#include <sys/ioctl.h>
+#ifdef HAVE_LINUX_MAJOR_H
+#include <linux/major.h>
+#endif /* HAVE_LINUX_MAJOR_H */
+#endif /* HAVE_LINUX_LOOP_H */
#ifdef HAVE_MNTENT_H
#include <mntent.h>
#endif
#endif /* HAVE_GETMNTINFO */
#include <string.h>
#include <sys/stat.h>
+#if HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_SYS_SYSMACROS_H
+#include <sys/sysmacros.h>
+#endif
#include "ext2_fs.h"
#include "ext2fs.h"
-#ifdef HAVE_MNTENT_H
+#ifdef HAVE_SETMNTENT
+/*
+ * Check to see if a regular file is mounted.
+ * If /etc/mtab/ is a symlink of /proc/mounts, you will need the following check
+ * because the name in /proc/mounts is a loopback device not a regular file.
+ */
+static int check_loop_mounted(const char *mnt_fsname, dev_t mnt_rdev,
+ dev_t file_dev, ino_t file_ino)
+{
+#if defined(HAVE_LINUX_LOOP_H) && defined(HAVE_LINUX_MAJOR_H)
+ struct loop_info64 loopinfo = {0, };
+ int loop_fd, ret;
+
+ if (major(mnt_rdev) == LOOP_MAJOR) {
+ loop_fd = open(mnt_fsname, O_RDONLY);
+ if (loop_fd < 0)
+ return -1;
+
+ ret = ioctl(loop_fd, LOOP_GET_STATUS64, &loopinfo);
+ close(loop_fd);
+ if (ret < 0)
+ return -1;
+
+ if (file_dev == loopinfo.lo_device &&
+ file_ino == loopinfo.lo_inode)
+ return 1;
+ }
+#endif /* defined(HAVE_LINUX_LOOP_H) && defined(HAVE_LINUX_MAJOR_H) */
+ return 0;
+}
+
/*
* Helper function which checks a file in /etc/mtab format to see if a
* filesystem is mounted. Returns an error if the file doesn't exist
- * or can't be opened.
+ * or can't be opened.
*/
-static errcode_t check_mntent_file(const char *mtab_file, const char *file,
+static errcode_t check_mntent_file(const char *mtab_file, const char *file,
int *mount_flags, char *mtpt, int mtlen)
{
struct mntent *mnt;
int fd;
*mount_flags = 0;
- if ((f = setmntent (mtab_file, "r")) == NULL)
+
+ if ((f = setmntent (mtab_file, "r")) == NULL) {
+ if (errno == ENOENT) {
+ if (getenv("EXT2FS_NO_MTAB_OK"))
+ return 0;
+ else
+ return EXT2_ET_NO_MTAB_FILE;
+ }
return errno;
+ }
if (stat(file, &st_buf) == 0) {
if (S_ISBLK(st_buf.st_mode)) {
#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
}
}
while ((mnt = getmntent (f)) != NULL) {
+ if (mnt->mnt_fsname[0] != '/')
+ continue;
if (strcmp(file, mnt->mnt_fsname) == 0)
break;
if (stat(mnt->mnt_fsname, &st_buf) == 0) {
#ifndef __GNU__
if (file_rdev && (file_rdev == st_buf.st_rdev))
break;
+ if (check_loop_mounted(mnt->mnt_fsname,
+ st_buf.st_rdev, file_dev,
+ file_ino) == 1)
+ break;
#endif /* __GNU__ */
} else {
if (file_dev && ((file_dev == st_buf.st_dev) &&
}
#ifndef __GNU__ /* The GNU hurd is deficient; what else is new? */
/* Validate the entry in case /etc/mtab is out of date */
- /*
+ /*
* We need to be paranoid, because some broken distributions
* (read: Slackware) don't initialize /etc/mtab before checking
* all of the non-root filesystems on the disk.
}
#endif /* __GNU__ */
*mount_flags = EXT2_MF_MOUNTED;
-
+
#ifdef MNTOPT_RO
/* Check to see if the ro option is set */
if (hasmntopt(mnt, MNTOPT_RO))
*/
if (!strcmp(mnt->mnt_dir, "/")) {
is_root:
-#define TEST_FILE "/.ismount-test-file"
+#define TEST_FILE "/.ismount-test-file"
*mount_flags |= EXT2_MF_ISROOT;
- fd = open(TEST_FILE, O_RDWR|O_CREAT);
+ fd = open(TEST_FILE, O_RDWR|O_CREAT, 0600);
if (fd < 0) {
if (errno == EROFS)
*mount_flags |= EXT2_MF_READONLY;
#endif /* MOUNTED */
retval = check_mntent_file(MOUNTED, file, mount_flags, mtpt, mtlen);
return retval;
-#else
+#else
*mount_flags = 0;
return 0;
#endif /* defined(MOUNTED) || defined(_PATH_MOUNTED) */
s1 = file;
if (strncmp(_PATH_DEV, s1, len) == 0)
s1 += len;
-
+
*mount_flags = 0;
while (--n >= 0) {
s2 = mp->f_mntfromname;
return 0;
}
#endif /* HAVE_GETMNTINFO */
-#endif /* HAVE_MNTENT_H */
+#endif /* HAVE_SETMNTENT */
/*
* Check to see if we're dealing with the swap device.
if (!(f = fopen("/proc/swaps", "r")))
return 0;
/* Skip the first line */
- fgets(buf, sizeof(buf), f);
- while (!feof(f)) {
- if (!fgets(buf, sizeof(buf), f))
- break;
+ if (!fgets(buf, sizeof(buf), f))
+ goto leave;
+ if (*buf && strncmp(buf, "Filename\t", 9))
+ /* Linux <=2.6.19 contained a bug in the /proc/swaps
+ * code where the header would not be displayed
+ */
+ goto valid_first_line;
+
+ while (fgets(buf, sizeof(buf), f)) {
+valid_first_line:
if ((cp = strchr(buf, ' ')) != NULL)
*cp = 0;
if ((cp = strchr(buf, '\t')) != NULL)
}
#endif /* __GNU__ */
}
+
+leave:
fclose(f);
return ret;
}
errcode_t ext2fs_check_mount_point(const char *device, int *mount_flags,
char *mtpt, int mtlen)
{
- struct stat st_buf;
errcode_t retval = 0;
- int fd;
+
+ if (getenv("EXT2FS_PRETEND_RO_MOUNT")) {
+ *mount_flags = EXT2_MF_MOUNTED | EXT2_MF_READONLY;
+ if (getenv("EXT2FS_PRETEND_ROOTFS"))
+ *mount_flags = EXT2_MF_ISROOT;
+ return 0;
+ }
+ if (getenv("EXT2FS_PRETEND_RW_MOUNT")) {
+ *mount_flags = EXT2_MF_MOUNTED;
+ if (getenv("EXT2FS_PRETEND_ROOTFS"))
+ *mount_flags = EXT2_MF_ISROOT;
+ return 0;
+ }
if (is_swap_device(device)) {
*mount_flags = EXT2_MF_MOUNTED | EXT2_MF_SWAP;
strncpy(mtpt, "<swap>", mtlen);
} else {
-#ifdef HAVE_MNTENT_H
+#ifdef HAVE_SETMNTENT
retval = check_mntent(device, mount_flags, mtpt, mtlen);
-#else
+#else
#ifdef HAVE_GETMNTINFO
retval = check_getmntinfo(device, mount_flags, mtpt, mtlen);
#else
#endif
*mount_flags = 0;
#endif /* HAVE_GETMNTINFO */
-#endif /* HAVE_MNTENT_H */
+#endif /* HAVE_SETMNTENT */
}
if (retval)
return retval;
#ifdef __linux__ /* This only works on Linux 2.6+ systems */
- if ((stat(device, &st_buf) != 0) ||
- !S_ISBLK(st_buf.st_mode))
- return 0;
- fd = open(device, O_RDONLY | O_EXCL);
- if (fd < 0) {
- if (errno == EBUSY)
- *mount_flags |= EXT2_MF_BUSY;
- } else
- close(fd);
+ {
+ struct stat st_buf;
+
+ if (stat(device, &st_buf) == 0 && S_ISBLK(st_buf.st_mode)) {
+ int fd = open(device, O_RDONLY | O_EXCL);
+
+ if (fd >= 0)
+ close(fd);
+ else if (errno == EBUSY)
+ *mount_flags |= EXT2_MF_BUSY;
+ }
+ }
#endif
return 0;
/*
* ext2fs_check_if_mounted() sets the mount_flags EXT2_MF_MOUNTED,
* EXT2_MF_READONLY, and EXT2_MF_ROOT
- *
+ *
*/
errcode_t ext2fs_check_if_mounted(const char *file, int *mount_flags)
{
{
int retval, mount_flags;
char mntpt[80];
-
+
if (argc < 2) {
fprintf(stderr, "Usage: %s device\n", argv[0]);
exit(1);
}
+ add_error_table(&et_ext2_error_table);
mntpt[0] = 0;
retval = ext2fs_check_mount_point(argv[1], &mount_flags,
mntpt, sizeof(mntpt));
git://git.whamcloud.com / tools / e2fsprogs.git / blobdiff