Use the nice new find_real_root_device function to find the

name of the root device, instead of having libc read whatever
lies happen to be in /etc/mtab.
 -Erik

8 files changed, 39 insertions, 54 deletions

diff --git a/coreutils/df.c b/coreutils/df.c
index bc843f7a2..331ef2d49 100644
--- a/coreutils/df.c
+++ b/coreutils/df.c
@@ -27,7 +27,6 @@
 #include <mntent.h>
 #include <sys/stat.h>
 #include <sys/vfs.h>
-#include <fstab.h>
 
 static const char df_usage[] = "df [filesystem ...]\n"
 
@@ -40,7 +39,6 @@ static int df(char *device, const char *mountPoint)
 	struct statfs s;
 	long blocks_used;
 	long blocks_percent_used;
-	struct fstab *fstabItem;
 
 	if (statfs(mountPoint, &s) != 0) {
 		perror(mountPoint);
@@ -53,9 +51,9 @@ static int df(char *device, const char *mountPoint)
 			(blocks_used * 100.0 / (blocks_used + s.f_bavail) + 0.5);
 		/* Note that if /etc/fstab is missing, libc can't fix up /dev/root for us */
 		if (strcmp(device, "/dev/root") == 0) {
-			fstabItem = getfsfile("/");
-			if (fstabItem != NULL)
-				device = fstabItem->fs_spec;
+			/* Adjusts device to be the real root device,
+			 * or leaves device alone if it can't find it */
+			find_real_root_device_name( device);
 		}
 		printf("%-20s %9ld %9ld %9ld %3ld%% %s\n",
 			   device,
diff --git a/df.c b/df.c
index bc843f7a2..331ef2d49 100644
--- a/df.c
+++ b/df.c
@@ -27,7 +27,6 @@
 #include <mntent.h>
 #include <sys/stat.h>
 #include <sys/vfs.h>
-#include <fstab.h>
 
 static const char df_usage[] = "df [filesystem ...]\n"
 
@@ -40,7 +39,6 @@ static int df(char *device, const char *mountPoint)
 	struct statfs s;
 	long blocks_used;
 	long blocks_percent_used;
-	struct fstab *fstabItem;
 
 	if (statfs(mountPoint, &s) != 0) {
 		perror(mountPoint);
@@ -53,9 +51,9 @@ static int df(char *device, const char *mountPoint)
 			(blocks_used * 100.0 / (blocks_used + s.f_bavail) + 0.5);
 		/* Note that if /etc/fstab is missing, libc can't fix up /dev/root for us */
 		if (strcmp(device, "/dev/root") == 0) {
-			fstabItem = getfsfile("/");
-			if (fstabItem != NULL)
-				device = fstabItem->fs_spec;
+			/* Adjusts device to be the real root device,
+			 * or leaves device alone if it can't find it */
+			find_real_root_device_name( device);
 		}
 		printf("%-20s %9ld %9ld %9ld %3ld%% %s\n",
 			   device,
diff --git a/internal.h b/internal.h
index 353ec8ca3..9f9461def 100644
--- a/internal.h
+++ b/internal.h
@@ -216,6 +216,8 @@ extern int check_wildcard_match(const char* text, const char* pattern);
 extern long getNum (const char *cp);
 extern pid_t findPidByName( char* pidName);
 extern void *xmalloc (size_t size);
+extern int find_real_root_device_name(char* name);
+
 #ifdef BB_FEATURE_SH_COMMAND_EDITING
 #include <stdio.h>
 extern int cmdedit_read_input(char* prompt, int inputFd, int outputFd, char command[BUFSIZ]);
diff --git a/mount.c b/mount.c
index 336cff7d2..03891371a 100644
--- a/mount.c
+++ b/mount.c
@@ -45,7 +45,6 @@
 #include <mntent.h>
 #include <sys/mount.h>
 #include <ctype.h>
-#include <fstab.h>
 #if defined BB_FEATURE_USE_DEVPS_PATCH
 #include <linux/devmtab.h>
 #endif
@@ -321,9 +320,6 @@ extern int mount_main(int argc, char **argv)
 	int useMtab = TRUE;
 	int i;
 
-	/* Only compiled in if BB_MTAB is not defined */
-	whine_if_fstab_is_missing();
-
 #if defined BB_FEATURE_USE_DEVPS_PATCH
 	if (argc == 1) {
 		int fd, i, numfilesystems;
@@ -364,14 +360,9 @@ extern int mount_main(int argc, char **argv)
 			struct mntent *m;
 
 			while ((m = getmntent(mountTable)) != 0) {
-				struct fstab *fstabItem;
 				char *blockDevice = m->mnt_fsname;
-
-				/* Note that if /etc/fstab is missing, libc can't fix up /dev/root for us */
 				if (strcmp(blockDevice, "/dev/root") == 0) {
-					fstabItem = getfsfile("/");
-					if (fstabItem != NULL)
-						blockDevice = fstabItem->fs_spec;
+					find_real_root_device_name( blockDevice);
 				}
 				printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
 					   m->mnt_type, m->mnt_opts);
@@ -445,7 +436,7 @@ extern int mount_main(int argc, char **argv)
 		FILE *f = setmntent("/etc/fstab", "r");
 
 		if (f == NULL)
-			fatalError( "\nCannot ream /etc/fstab: %s\n", strerror (errno));
+			fatalError( "\nCannot read /etc/fstab: %s\n", strerror (errno));
 
 		while ((m = getmntent(f)) != NULL) {
 			// If the file system isn't noauto, 
diff --git a/umount.c b/umount.c
index 6661db878..c34bf5fc3 100644
--- a/umount.c
+++ b/umount.c
@@ -26,7 +26,6 @@
 #include <stdio.h>
 #include <sys/mount.h>
 #include <mntent.h>
-#include <fstab.h>
 #include <errno.h>
 
 
@@ -110,11 +109,10 @@ char *mtab_getinfo(const char *match, const char which)
 			} else {
 #if !defined BB_MTAB
 				if (strcmp(cur->device, "/dev/root") == 0) {
-					struct fstab *fstabItem;
-
-					fstabItem = getfsfile("/");
-					if (fstabItem != NULL)
-						return fstabItem->fs_spec;
+					/* Adjusts device to be the real root device,
+					 * or leaves device alone if it can't find it */
+					find_real_root_device_name( cur->device);
+					return ( cur->device);
 				}
 #endif
 				return cur->device;
diff --git a/util-linux/mount.c b/util-linux/mount.c
index 336cff7d2..03891371a 100644
--- a/util-linux/mount.c
+++ b/util-linux/mount.c
@@ -45,7 +45,6 @@
 #include <mntent.h>
 #include <sys/mount.h>
 #include <ctype.h>
-#include <fstab.h>
 #if defined BB_FEATURE_USE_DEVPS_PATCH
 #include <linux/devmtab.h>
 #endif
@@ -321,9 +320,6 @@ extern int mount_main(int argc, char **argv)
 	int useMtab = TRUE;
 	int i;
 
-	/* Only compiled in if BB_MTAB is not defined */
-	whine_if_fstab_is_missing();
-
 #if defined BB_FEATURE_USE_DEVPS_PATCH
 	if (argc == 1) {
 		int fd, i, numfilesystems;
@@ -364,14 +360,9 @@ extern int mount_main(int argc, char **argv)
 			struct mntent *m;
 
 			while ((m = getmntent(mountTable)) != 0) {
-				struct fstab *fstabItem;
 				char *blockDevice = m->mnt_fsname;
-
-				/* Note that if /etc/fstab is missing, libc can't fix up /dev/root for us */
 				if (strcmp(blockDevice, "/dev/root") == 0) {
-					fstabItem = getfsfile("/");
-					if (fstabItem != NULL)
-						blockDevice = fstabItem->fs_spec;
+					find_real_root_device_name( blockDevice);
 				}
 				printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
 					   m->mnt_type, m->mnt_opts);
@@ -445,7 +436,7 @@ extern int mount_main(int argc, char **argv)
 		FILE *f = setmntent("/etc/fstab", "r");
 
 		if (f == NULL)
-			fatalError( "\nCannot ream /etc/fstab: %s\n", strerror (errno));
+			fatalError( "\nCannot read /etc/fstab: %s\n", strerror (errno));
 
 		while ((m = getmntent(f)) != NULL) {
 			// If the file system isn't noauto, 
diff --git a/util-linux/umount.c b/util-linux/umount.c
index 6661db878..c34bf5fc3 100644
--- a/util-linux/umount.c
+++ b/util-linux/umount.c
@@ -26,7 +26,6 @@
 #include <stdio.h>
 #include <sys/mount.h>
 #include <mntent.h>
-#include <fstab.h>
 #include <errno.h>
 
 
@@ -110,11 +109,10 @@ char *mtab_getinfo(const char *match, const char which)
 			} else {
 #if !defined BB_MTAB
 				if (strcmp(cur->device, "/dev/root") == 0) {
-					struct fstab *fstabItem;
-
-					fstabItem = getfsfile("/");
-					if (fstabItem != NULL)
-						return fstabItem->fs_spec;
+					/* Adjusts device to be the real root device,
+					 * or leaves device alone if it can't find it */
+					find_real_root_device_name( cur->device);
+					return ( cur->device);
 				}
 #endif
 				return cur->device;
diff --git a/utility.c b/utility.c
index 37f698ea4..c779cc6ba 100644
--- a/utility.c
+++ b/utility.c
@@ -1469,25 +1469,29 @@ extern char *find_unused_loop_device(void)
 }
 #endif							/* BB_FEATURE_MOUNT_LOOP */
 
-#if defined BB_MOUNT
-char* find_real_root_device_name(void)
+#if defined BB_MOUNT || defined BB_DF
+extern int find_real_root_device_name(char* name)
 {
-	int gotIt=0;
 	DIR *dir;
 	struct dirent *entry;
 	struct stat statBuf, rootStat;
 	char fileName[BUFSIZ];
 
-	if (stat("/", &rootStat) != 0)
-		fatalError("Wierd.  I could not stat '/'\n");
+	if (stat("/", &rootStat) != 0) {
+		errorMsg("could not stat '/'\n");
+		return( FALSE);
+	}
 
-	if (!(dir = opendir("/dev"));
-		fatalError("Wierd.  I could not open '/dev'\n");
+	dir = opendir("/dev");
+	if (!dir) {
+		errorMsg("could not open '/dev'\n");
+		return( FALSE);
+	}
 
 	while((entry = readdir(dir)) != NULL) {
+
 		/* Must skip ".." since that is "/", and so we 
 		 * would get a false positive on ".."  */
-
 		if (strcmp(entry->d_name, "..") == 0)
 			continue;
 
@@ -1495,12 +1499,17 @@ char* find_real_root_device_name(void)
 
 		if (stat(fileName, &statBuf) != 0)
 			continue;
+		/* Some char devices have the same dev_t as block
+		 * devices, so make sure this is a block device */
+		if (! S_ISBLK(statBuf.st_mode))
+			continue;
 		if (statBuf.st_rdev == rootStat.st_rdev) {
-			return (strdup(fileName));
+			strcpy(name, fileName); 
+			return ( TRUE);
 		}
 	}
 
-	return( NULL);
+	return( FALSE);
 }
 #endif