find_mount_point: fix find_mount_point for char devices

This allows to find mount points of 'char' devices such as UBI volumes
which otherwise fail for example with 'df' command:

/ # df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/root             72091984  12360980  56068924  18% /
devtmpfs                115236         4    115232   0% /dev
tmpfs                    28672        32     28640   0% /tmp
/dev/ubi0_0             360268     18348    341920   5% /tmp/mnt/userfs

/ # df /dev/ubi0_0
Filesystem           1K-blocks      Used Available Use% Mounted on
devtmpfs                115236         4    115232   0% /dev

Signed-off-by: Javier Viguera <javier.viguera@digi.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/libbb/find_mount_point.c b/libbb/find_mount_point.c
index 56637ad923502a0d52a4684558c56fb8cd466940..9676b5f52c6cf8b8da4937f713a7de007c3df9bc 100644 (file)
--- a/libbb/find_mount_point.c
+++ b/libbb/find_mount_point.c
@@ -30,7 +30,8 @@ struct mntent* FAST_FUNC find_mount_point(const char *name, int subdir_too)
 
        devno_of_name = s.st_dev;
        block_dev = 0;
-       if (S_ISBLK(s.st_mode)) {
+       /* Why S_ISCHR? - UBI volumes use char devices, not block */
+       if (S_ISBLK(s.st_mode) || S_ISCHR(s.st_mode)) {
                devno_of_name = s.st_rdev;
                block_dev = 1;
        }