commit ffb1d5ac21ee480df92818b8aa97f498bb88fa43
author Keun-young Park <keunyoung@google.com> Fri Apr 07 14:16:42 2017 -0700
committer Keun-young Park <keunyoung@google.com> Thu Apr 13 11:32:53 2017 -0700
tree 9ca7f9ac2d6d8ca16d5f35638930be3299947946
parent 69bb1144440b6b2f877561168f4469a11279773e

use s_max_mnt_count to detect mke2fs generated partition

- Old tool will set it to 10 while mke2fs will set it to -1.
- For now, only tag it.
- TODO: possibly add different policy per image tool version.

bug: 32246772
Test: check dmesg after reboot

(cherry picked from commit 95e233f9ff4d51bbafc6314b88920f553edd365f)

Change-Id: Icd4758e240009d7b37df2d8a0e2a20d5ddbe4906

fs_mgr/fs_mgr.cpp

diff --git a/fs_mgr/fs_mgr.cpp b/fs_mgr/fs_mgr.cpp
index 6636be2..120129c 100644
--- a/fs_mgr/fs_mgr.cpp
+++ b/fs_mgr/fs_mgr.cpp
@@ -283,7 +283,10 @@
                     return force_check;
                 }
                 *fs_stat |= FS_STAT_IS_EXT4;
-                //TODO check if it is new version or not
+                LINFO << "superblock s_max_mnt_count:" << sb.s_max_mnt_count << "," << blk_device;
+                if (sb.s_max_mnt_count == 0xffff) {  // -1 (int16) in ext2, but uint16 in ext4
+                    *fs_stat |= FS_STAT_NEW_IMAGE_VERSION;
+                }
                 if ((sb.s_feature_incompat & EXT4_FEATURE_INCOMPAT_RECOVER) != 0 ||
                     (sb.s_state & EXT4_VALID_FS) == 0) {
                     LINFO << __FUNCTION__ << "(): was not clealy shutdown, state flag:"