[PATCH v2 2/2] Ext4Pkg: Support uncleanly unmounted filesystems

["Jeff Brasen" <jbrasen@nvidia.com>]

Support for uncleanly mounted filesystems, if there is a recovery
journal mark filesystem as read-only.

Signed-off-by: Jeff Brasen <jbrasen@nvidia.com>
---
 Features/Ext4Pkg/Ext4Dxe/Superblock.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/Features/Ext4Pkg/Ext4Dxe/Superblock.c b/Features/Ext4Pkg/Ext4Dxe/Superblock.c
index 1ceb0d5cbb..251babb320 100644
--- a/Features/Ext4Pkg/Ext4Dxe/Superblock.c
+++ b/Features/Ext4Pkg/Ext4Dxe/Superblock.c
@@ -18,7 +18,7 @@ STATIC CONST UINT32  gSupportedIncompatFeat =
   EXT4_FEATURE_INCOMPAT_64BIT | EXT4_FEATURE_INCOMPAT_DIRDATA |
   EXT4_FEATURE_INCOMPAT_FLEX_BG | EXT4_FEATURE_INCOMPAT_FILETYPE |
   EXT4_FEATURE_INCOMPAT_EXTENTS | EXT4_FEATURE_INCOMPAT_LARGEDIR |
-  EXT4_FEATURE_INCOMPAT_MMP;
+  EXT4_FEATURE_INCOMPAT_MMP | EXT4_FEATURE_INCOMPAT_RECOVER;
 
 // Future features that may be nice additions in the future:
 // 1) Btree support: Required for write support and would speed up lookups in large directories.
@@ -89,10 +89,8 @@ Ext4SuperblockValidate (
     return FALSE;
   }
 
-  // Is this correct behaviour? Imagine the power cuts out, should the system fail to boot because
-  // we're scared of touching something corrupt?
   if ((Sb->s_state & EXT4_FS_STATE_UNMOUNTED) == 0) {
-    return FALSE;
+    DEBUG ((DEBUG_WARN, "[ext4] Filesystem was not unmounted cleanly\n"));
   }
 
   return TRUE;
@@ -215,6 +213,11 @@ Ext4OpenSuperblock (
     return EFI_UNSUPPORTED;
   }
 
+  if (EXT4_HAS_INCOMPAT (Partition, EXT4_FEATURE_INCOMPAT_RECOVER)) {
+    DEBUG ((DEBUG_WARN, "[ext4] Needs journal recovery, mounting read-only\n"));
+    Partition->ReadOnly = TRUE;
+  }
+
   // At the time of writing, it's the only supported checksum.
   if (Partition->FeaturesCompat & EXT4_FEATURE_RO_COMPAT_METADATA_CSUM &&
       Sb->s_checksum_type != EXT4_CHECKSUM_CRC32C) {
-- 
2.17.1