/*
* ismounted.c --- Check to see if the filesystem was mounted
*
- * Copyright (C) 1995 Theodore Ts'o.
+ * 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
#include <sys/mount.h>
#endif /* HAVE_GETMNTINFO */
#include <string.h>
+#include <sys/stat.h>
-#if EXT2_FLAT_INCLUDES
#include "ext2_fs.h"
-#else
-#include <linux/ext2_fs.h>
-#endif
-
#include "ext2fs.h"
#ifdef HAVE_MNTENT_H
static errcode_t check_mntent_file(const char *mtab_file, const char *file,
int *mount_flags, char *mtpt, int mtlen)
{
- FILE * f;
- struct mntent * mnt;
- int fd;
+ struct mntent *mnt;
+ struct stat st_buf;
+ errcode_t retval = 0;
+ dev_t file_dev=0, file_rdev=0;
+ ino_t file_ino=0;
+ FILE *f;
+ int fd;
*mount_flags = 0;
if ((f = setmntent (mtab_file, "r")) == NULL)
return errno;
- while ((mnt = getmntent (f)) != NULL)
+ 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 */
+ file_rdev = st_buf.st_rdev;
+#endif /* __GNU__ */
+ } else {
+ file_dev = st_buf.st_dev;
+ file_ino = st_buf.st_ino;
+ }
+ }
+ while ((mnt = getmntent (f)) != NULL) {
if (strcmp(file, mnt->mnt_fsname) == 0)
break;
- endmntent (f);
- if (mnt == 0)
- return 0;
+ if (stat(mnt->mnt_fsname, &st_buf) == 0) {
+ if (S_ISBLK(st_buf.st_mode)) {
+#ifndef __GNU__
+ if (file_rdev && (file_rdev == st_buf.st_rdev))
+ break;
+#endif /* __GNU__ */
+ } else {
+ if (file_dev && ((file_dev == st_buf.st_dev) &&
+ (file_ino == st_buf.st_ino)))
+ break;
+ }
+ }
+ }
+
+ if (mnt == 0) {
+#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
+ /*
+ * Do an extra check to see if this is the root device. We
+ * can't trust /etc/mtab, and /proc/mounts will only list
+ * /dev/root for the root filesystem. Argh. Instead we
+ * check if the given device has the same major/minor number
+ * as the device that the root directory is on.
+ */
+ if (file_rdev && stat("/", &st_buf) == 0) {
+ if (st_buf.st_dev == file_rdev) {
+ *mount_flags = EXT2_MF_MOUNTED;
+ if (mtpt)
+ strncpy(mtpt, "/", mtlen);
+ goto is_root;
+ }
+ }
+#endif /* __GNU__ */
+ goto exit;
+ }
+#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+ /* Validate the entry in case /etc/mtab is out of date */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 exit;
+ }
+ 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 exit;
+ }
+#endif /* __GNU__ */
*mount_flags = EXT2_MF_MOUNTED;
/* Check to see if the ro option is set */
if (hasmntopt(mnt, MNTOPT_RO))
*mount_flags |= EXT2_MF_READONLY;
+ if (mtpt)
+ strncpy(mtpt, mnt->mnt_dir, mtlen);
/*
* Check to see if we're referring to the root filesystem.
* If so, do a manual check to see if we can open /etc/mtab
- * read/write, since if the root is mounted read/only,
- * /etc/mtab may not be accurate.
+ * read/write, since if the root is mounted read/only, the
+ * contents of /etc/mtab may not be accurate.
*/
if (!strcmp(mnt->mnt_dir, "/")) {
+is_root:
+#define TEST_FILE "/.ismount-test-file"
*mount_flags |= EXT2_MF_ISROOT;
- fd = open(MOUNTED, O_RDWR);
+ fd = open(TEST_FILE, O_RDWR|O_CREAT);
if (fd < 0) {
if (errno == EROFS)
*mount_flags |= EXT2_MF_READONLY;
} else
close(fd);
+ (void) unlink(TEST_FILE);
}
- if (mtpt)
- strncpy(mtpt, mnt->mnt_dir, mtlen);
- return 0;
+ retval = 0;
+exit:
+ endmntent (f);
+ return retval;
}
static errcode_t check_mntent(const char *file, int *mount_flags,
{
errcode_t retval;
+#ifdef DEBUG
+ retval = check_mntent_file("/tmp/mtab", file, mount_flags,
+ mtpt, mtlen);
+ if (retval == 0)
+ return 0;
+#endif /* DEBUG */
#ifdef __linux__
retval = check_mntent_file("/proc/mounts", file, mount_flags,
mtpt, mtlen);
- if (retval == 0)
+ if (retval == 0 && (*mount_flags != 0))
return 0;
-#endif
+#endif /* __linux__ */
+#if defined(MOUNTED) || defined(_PATH_MOUNTED)
+#ifndef MOUNTED
+#define MOUNTED _PATH_MOUNTED
+#endif /* MOUNTED */
retval = check_mntent_file(MOUNTED, file, mount_flags, mtpt, mtlen);
return retval;
+#else
+ *mount_flags = 0;
+ return 0;
+#endif /* defined(MOUNTED) || defined(_PATH_MOUNTED) */
}
-#endif
+#elif defined(HAVE_GETMNTINFO)
-#ifdef HAVE_GETMNTINFO
static errcode_t check_getmntinfo(const char *file, int *mount_flags,
char *mtpt, int mtlen)
{
#endif /* HAVE_GETMNTINFO */
/*
+ * Check to see if we're dealing with the swap device.
+ */
+static int is_swap_device(const char *file)
+{
+ FILE *f;
+ char buf[1024], *cp;
+ dev_t file_dev;
+ struct stat st_buf;
+ int ret = 0;
+
+ 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))
+ file_dev = st_buf.st_rdev;
+#endif /* __GNU__ */
+
+ 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 ((cp = strchr(buf, ' ')) != NULL)
+ *cp = 0;
+ if ((cp = strchr(buf, '\t')) != NULL)
+ *cp = 0;
+ if (strcmp(buf, file) == 0) {
+ ret++;
+ break;
+ }
+#ifndef __GNU__
+ if (file_dev && (stat(buf, &st_buf) == 0) &&
+ S_ISBLK(st_buf.st_mode) &&
+ file_dev == st_buf.st_rdev) {
+ ret++;
+ break;
+ }
+#endif /* __GNU__ */
+ }
+ fclose(f);
+ return ret;
+}
+
+
+/*
* ext2fs_check_mount_point() returns 1 if the device is mounted, 0
* otherwise. If mtpt is non-NULL, the directory where the device is
* mounted is copied to where mtpt is pointing, up to mtlen
errcode_t ext2fs_check_mount_point(const char *device, int *mount_flags,
char *mtpt, int mtlen)
{
+ if (is_swap_device(device)) {
+ *mount_flags = EXT2_MF_MOUNTED | EXT2_MF_SWAP;
+ strncpy(mtpt, "<swap>", mtlen);
+ return 0;
+ }
#ifdef HAVE_MNTENT_H
return check_mntent(device, mount_flags, mtpt, mtlen);
#else
#ifdef HAVE_GETMNTINFO
return check_getmntinfo(device, mount_flags, mtpt, mtlen);
#else
+#warning "Can't use getmntent or getmntinfo to check for mounted filesystems!"
*mount_flags = 0;
return 0;
#endif /* HAVE_GETMNTINFO */
}
/*
- * ext2fs_check_if_mounted() sets the mount_flags EXT2_MF_MOUNTED and
- * EXT2_MF_READONLY
+ * ext2fs_check_if_mounted() sets the mount_flags EXT2_MF_MOUNTED,
+ * EXT2_MF_READONLY, and EXT2_MF_ROOT
*
*/
-#ifdef __TURBOC__
- #pragma argsused
-#endif
errcode_t ext2fs_check_if_mounted(const char *file, int *mount_flags)
{
-#ifdef HAVE_MNTENT_H
- return check_mntent(file, mount_flags, NULL, 0);
-#else
-#ifdef HAVE_GETMNTINFO
- return check_getmntinfo(file, mount_flags, NULL, 0);
-#else
- *mount_flags = 0;
- return 0;
-#endif /* HAVE_GETMNTINFO */
-#endif /* HAVE_MNTENT_H */
+ return ext2fs_check_mount_point(file, mount_flags, NULL, 0);
}
#ifdef DEBUG
int main(int argc, char **argv)
{
- blk_t blocks;
int retval, mount_flags;
+ char mntpt[80];
if (argc < 2) {
fprintf(stderr, "Usage: %s device\n", argv[0]);
exit(1);
}
- retval = ext2fs_check_if_mounted(argv[1], &mount_flags);
+ mntpt[0] = 0;
+ retval = ext2fs_check_mount_point(argv[1], &mount_flags,
+ mntpt, sizeof(mntpt));
if (retval) {
com_err(argv[0], retval,
"while calling ext2fs_check_if_mounted");
}
printf("Device %s reports flags %02x\n", argv[1], mount_flags);
if (mount_flags & EXT2_MF_MOUNTED)
- printf("\t%s is mounted.\n");
-
+ printf("\t%s is mounted.\n", argv[1]);
+
+ if (mount_flags & EXT2_MF_SWAP)
+ printf("\t%s is a swap device.\n", argv[1]);
+
if (mount_flags & EXT2_MF_READONLY)
- printf("\t%s is read-only.\n");
+ printf("\t%s is read-only.\n", argv[1]);
if (mount_flags & EXT2_MF_ISROOT)
- printf("\t%s is the root filesystem.\n");
+ printf("\t%s is the root filesystem.\n", argv[1]);
+ if (mntpt[0])
+ printf("\t%s is mounted on %s.\n", argv[1], mntpt);
exit(0);
}
-#endif
+#endif /* DEBUG */