[edk2-devel] [edk2-platforms][PATCH v2 2/2] Ext4Pkg: Add base containing record macro for EXT4_FILE

[Savva Mitrofanov]

We shouldn't use direct casts, because in the future it could break
the code, so using BASE_CR would be safe against possible structure
changes and rearrangements

Cc: Marvin Häuser <mhaeuser at posteo.de>
Cc: Pedro Falcato <pedro.falcato at gmail.com>
Cc: Vitaly Cheptsov <vit9696 at protonmail.com>
Signed-off-by: Savva Mitrofanov <savvamtr at gmail.com>
---
 Features/Ext4Pkg/Ext4Dxe/Ext4Dxe.h |  2 ++
 Features/Ext4Pkg/Ext4Dxe/File.c    | 16 ++++++++--------
 2 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/Features/Ext4Pkg/Ext4Dxe/Ext4Dxe.h b/Features/Ext4Pkg/Ext4Dxe/Ext4Dxe.h
index a1eb32aa2cff..3ff7b29e7133 100644
--- a/Features/Ext4Pkg/Ext4Dxe/Ext4Dxe.h
+++ b/Features/Ext4Pkg/Ext4Dxe/Ext4Dxe.h
@@ -383,6 +383,8 @@ struct _Ext4File {
   EXT4_DENTRY           *Dentry;

 };

 

+#define EXT4_FILE_FROM_THIS(This)  BASE_CR ((This), EXT4_FILE, Protocol)

+

 #define EXT4_FILE_FROM_OPEN_FILES_NODE(Node)                                   \

   BASE_CR(Node, EXT4_FILE, OpenFilesListNode)

 

diff --git a/Features/Ext4Pkg/Ext4Dxe/File.c b/Features/Ext4Pkg/Ext4Dxe/File.c
index 0fb9e05e6647..750397010443 100644
--- a/Features/Ext4Pkg/Ext4Dxe/File.c
+++ b/Features/Ext4Pkg/Ext4Dxe/File.c
@@ -568,7 +568,7 @@ Ext4Open (
   EXT4_FILE   *FoundFile;

   EXT4_FILE   *Source;

 

-  Source = (EXT4_FILE *)This;

+  Source = EXT4_FILE_FROM_THIS (This);

 

   //

   // Reset Symloops counter

@@ -605,7 +605,7 @@ Ext4Close (
   IN EFI_FILE_PROTOCOL  *This

   )

 {

-  return Ext4CloseInternal ((EXT4_FILE *)This);

+  return Ext4CloseInternal (EXT4_FILE_FROM_THIS (This));

 }

 

 /**

@@ -686,7 +686,7 @@ Ext4ReadFile (
   EXT4_PARTITION  *Partition;

   EFI_STATUS      Status;

 

-  File      = (EXT4_FILE *)This;

+  File      = EXT4_FILE_FROM_THIS (This);

   Partition = File->Partition;

 

   ASSERT (Ext4FileIsOpenable (File));

@@ -737,7 +737,7 @@ Ext4WriteFile (
 {

   EXT4_FILE  *File;

 

-  File = (EXT4_FILE *)This;

+  File = EXT4_FILE_FROM_THIS (This);

 

   if (!(File->OpenMode & EFI_FILE_MODE_WRITE)) {

     return EFI_ACCESS_DENIED;

@@ -767,7 +767,7 @@ Ext4GetPosition (
 {

   EXT4_FILE  *File;

 

-  File = (EXT4_FILE *)This;

+  File = EXT4_FILE_FROM_THIS (This);

 

   if (Ext4FileIsDir (File)) {

     return EFI_UNSUPPORTED;

@@ -800,7 +800,7 @@ Ext4SetPosition (
 {

   EXT4_FILE  *File;

 

-  File = (EXT4_FILE *)This;

+  File = EXT4_FILE_FROM_THIS (This);

 

   // Only seeks to 0 (so it resets the ReadDir operation) are allowed

   if (Ext4FileIsDir (File) && (Position != 0)) {

@@ -1068,7 +1068,7 @@ Ext4GetInfo (
   EXT4_FILE       *File;

   EXT4_PARTITION  *Partition;

 

-  File      = (EXT4_FILE *)This;

+  File      = EXT4_FILE_FROM_THIS (This);

   Partition = File->Partition;

 

   if (CompareGuid (InformationType, &gEfiFileInfoGuid)) {

@@ -1185,7 +1185,7 @@ Ext4SetInfo (
   EXT4_FILE       *File;

   EXT4_PARTITION  *Partition;

 

-  File      = (EXT4_FILE *)This;

+  File      = EXT4_FILE_FROM_THIS (This);

   Partition = File->Partition;

 

   if (Partition->ReadOnly) {

-- 
2.37.0



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