Tito, farmatito at tiscali dot it writes:

Hi to all,
This patch is useful for:
1) remove an unused var from extern char *find_real_root_device_name(const char* name)
    changing it to extern char *find_real_root_device_name(void).
2) fixes include/libbb.h, coreutils/df.c, util-linux/mount.c and  util-linux/umount.c accordingly.
3) fixes a bug, really a false positive,  in find_real_root_device_name() that happens if
    in the /dev directory exists a link named root (/dev/root) that should be skipped but
    is not. This affects applets like df that display wrong results

5 files changed, 10 insertions, 6 deletions

diff --git a/coreutils/df.c b/coreutils/df.c
index cff69fe1a..ba2e7ccc9 100644
--- a/coreutils/df.c
+++ b/coreutils/df.c
@@ -130,7 +130,7 @@ extern int df_main(int argc, char **argv)
 			} else if (strcmp(device, "/dev/root") == 0) {
 				/* Adjusts device to be the real root device,
 				* or leaves device alone if it can't find it */
-				if ((device = find_real_root_device_name(device)) == NULL) {
+				if ((device = find_real_root_device_name()) == NULL) {
 					goto SET_ERROR;
 				}
 			}
diff --git a/include/libbb.h b/include/libbb.h
index c52e65555..afbd0203e 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -134,7 +134,7 @@ extern void write_mtab(char* blockDevice, char* directory,
 					   char* filesystemType, long flags, char* string_flags);
 extern void erase_mtab(const char * name);
 extern long *find_pid_by_name( const char* pidName);
-extern char *find_real_root_device_name(const char* name);
+extern char *find_real_root_device_name(void);
 extern char *bb_get_line_from_file(FILE *file);
 extern char *bb_get_chomped_line_from_file(FILE *file);
 extern int bb_copyfd_size(int fd1, int fd2, const off_t size);
diff --git a/libbb/find_root_device.c b/libbb/find_root_device.c
index 81824a216..2600ce5e0 100644
--- a/libbb/find_root_device.c
+++ b/libbb/find_root_device.c
@@ -27,7 +27,7 @@
 
 
 
-extern char *find_real_root_device_name(const char* name)
+extern char *find_real_root_device_name(void)
 {
 	DIR *dir;
 	struct dirent *entry;
@@ -54,7 +54,11 @@ extern char *find_real_root_device_name(const char* name)
 				 * would get a false positive on ".."  */
 				if (myname[0] == '.' && myname[1] == '.' && !myname[2])
 					continue;
-
+#ifdef CONFIG_FEATURE_DEVFS
+				/* if there is a link named /dev/root skip that too */
+				if (strcmp(myname, "root")==0)
+					continue;
+#endif
 				fileName = concat_path_file("/dev", myname);
 
 				/* Some char devices have the same dev_t as block
diff --git a/util-linux/mount.c b/util-linux/mount.c
index 0bc46ecb5..b059d7094 100644
--- a/util-linux/mount.c
+++ b/util-linux/mount.c
@@ -345,7 +345,7 @@ static void show_mounts(char *onlytype)
 			if (strcmp(blockDevice, "rootfs") == 0) {
 				continue;
 			} else if (strcmp(blockDevice, "/dev/root") == 0) {
-				blockDevice = find_real_root_device_name(blockDevice);
+				blockDevice = find_real_root_device_name();
 			}
 			if (!onlytype || (strcmp(m->mnt_type, onlytype) == 0)) {
 				printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
diff --git a/util-linux/umount.c b/util-linux/umount.c
index 37a8f061e..21c2e6e4d 100644
--- a/util-linux/umount.c
+++ b/util-linux/umount.c
@@ -115,7 +115,7 @@ static char *mtab_getinfo(const char *match, const char which)
 				} else if (strcmp(cur->device, "/dev/root") == 0) {
 					/* Adjusts device to be the real root device,
 					 * or leaves device alone if it can't find it */
-					cur->device = find_real_root_device_name(cur->device);
+					cur->device = find_real_root_device_name();
 				}
 #endif
 				return cur->device;