* 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"
+#include "ext2fsP.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;
+}
-#ifdef HAVE_MNTENT_H
/*
* 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
int *mount_flags, char *mtpt, int mtlen)
{
struct mntent *mnt;
- struct stat st_buf;
+ struct stat st_buf, dir_st_buf;
errcode_t retval = 0;
dev_t file_dev=0, file_rdev=0;
ino_t file_ino=0;
int fd;
*mount_flags = 0;
- if ((f = setmntent (mtab_file, "r")) == NULL)
- return (errno == ENOENT ? EXT2_NO_MTAB_FILE : errno);
+
+ 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)) {
+ if (ext2fsP_is_disk_device(st_buf.st_mode)) {
#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
file_rdev = st_buf.st_rdev;
#endif /* __GNU__ */
while ((mnt = getmntent (f)) != NULL) {
if (mnt->mnt_fsname[0] != '/')
continue;
- if (strcmp(file, mnt->mnt_fsname) == 0)
+ if (strcmp(file, mnt->mnt_fsname) == 0) {
+ if (stat(mnt->mnt_dir, &st_buf) != 0)
+ continue;
+ if (file_rdev && (file_rdev != st_buf.st_dev)) {
+#ifdef DEBUG
+ printf("Bogus entry in %s! "
+ "(%s is not mounted on %s)\n",
+ mtab_file, file, mnt->mnt_dir);
+#endif /* DEBUG */
+ continue;
+ }
break;
+ }
if (stat(mnt->mnt_fsname, &st_buf) == 0) {
- if (S_ISBLK(st_buf.st_mode)) {
+ if (ext2fsP_is_disk_device(st_buf.st_mode)) {
#ifndef __GNU__
- if (file_rdev && (file_rdev == st_buf.st_rdev))
+ if (file_rdev &&
+ (file_rdev == st_buf.st_rdev)) {
+ if (stat(mnt->mnt_dir,
+ &dir_st_buf) != 0)
+ continue;
+ if (file_rdev == dir_st_buf.st_dev)
+ break;
+ }
+ if (check_loop_mounted(mnt->mnt_fsname,
+ st_buf.st_rdev, file_dev,
+ file_ino) == 1)
break;
#endif /* __GNU__ */
} else {
#endif /* __GNU__ */
goto errout;
}
-#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.
- */
- if (stat(mnt->mnt_dir, &st_buf) < 0) {
- retval = errno;
- if (retval == ENOENT) {
-#ifdef DEBUG
- printf("Bogus entry in %s! (%s does not exist)\n",
- mtab_file, mnt->mnt_dir);
-#endif /* DEBUG */
- retval = 0;
- }
- goto errout;
- }
- if (file_rdev && (st_buf.st_dev != file_rdev)) {
-#ifdef DEBUG
- printf("Bogus entry in %s! (%s not mounted on %s)\n",
- mtab_file, file, mnt->mnt_dir);
-#endif /* DEBUG */
- goto errout;
- }
-#endif /* __GNU__ */
*mount_flags = EXT2_MF_MOUNTED;
#ifdef MNTOPT_RO
#ifdef __linux__
retval = check_mntent_file("/proc/mounts", file, mount_flags,
mtpt, mtlen);
- if (retval == 0 && (*mount_flags != 0))
+ if (retval == 0)
return 0;
#endif /* __linux__ */
#if defined(MOUNTED) || defined(_PATH_MOUNTED)
return 0;
}
#endif /* HAVE_GETMNTINFO */
-#endif /* HAVE_MNTENT_H */
+#endif /* HAVE_SETMNTENT */
/*
* Check to see if we're dealing with the swap device.
file_dev = 0;
#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
if ((stat(file, &st_buf) == 0) &&
- S_ISBLK(st_buf.st_mode))
+ ext2fsP_is_disk_device(st_buf.st_mode))
file_dev = st_buf.st_rdev;
#endif /* __GNU__ */
if (!(f = fopen("/proc/swaps", "r")))
return 0;
/* Skip the first line */
- if (fgets(buf, sizeof(buf), f))
+ 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)
}
#ifndef __GNU__
if (file_dev && (stat(buf, &st_buf) == 0) &&
- S_ISBLK(st_buf.st_mode) &&
+ ext2fsP_is_disk_device(st_buf.st_mode) &&
file_dev == st_buf.st_rdev) {
ret++;
break;
}
#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;
+ int busy = 0;
+
+ 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;
+ }
+
+#ifdef __linux__ /* This only works on Linux 2.6+ systems */
+ {
+ struct stat st_buf;
+
+ if (stat(device, &st_buf) == 0 &&
+ ext2fsP_is_disk_device(st_buf.st_mode)) {
+ int fd = open(device, O_RDONLY | O_EXCL);
+
+ if (fd >= 0) {
+ /*
+ * The device is not busy so it's
+ * definitelly not mounted. No need to
+ * to perform any more checks.
+ */
+ close(fd);
+ *mount_flags = 0;
+ return 0;
+ } else if (errno == EBUSY) {
+ busy = 1;
+ }
+ }
+ }
+#endif
if (is_swap_device(device)) {
*mount_flags = EXT2_MF_MOUNTED | EXT2_MF_SWAP;
- strncpy(mtpt, "<swap>", mtlen);
+ if (mtpt)
+ strncpy(mtpt, "<swap>", mtlen);
} else {
-#ifdef HAVE_MNTENT_H
+#ifdef HAVE_SETMNTENT
retval = check_mntent(device, mount_flags, mtpt, mtlen);
#else
#ifdef HAVE_GETMNTINFO
retval = check_getmntinfo(device, mount_flags, mtpt, mtlen);
#else
-#ifdef __GNUC__
+#if defined(__GNUC__) && !defined(_WIN32)
#warning "Can't use getmntent or getmntinfo to check for mounted filesystems!"
#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);
-#endif
+ if (busy)
+ *mount_flags |= EXT2_MF_BUSY;
return 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