Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers...

[reactos.git] / drivers / filesystems / ext2 / src / access.c

diff --git a/drivers/filesystems/ext2/src/access.c b/drivers/filesystems/ext2/src/access.c
new file mode 100644 (file)
index 0000000..03ec404
--- /dev/null
+++ b/drivers/filesystems/ext2/src/access.c
@@ -0,0 +1,54 @@
+/*
+ * COPYRIGHT:        See COPYRIGHT.TXT
+ * PROJECT:          Ext2 File System Driver for WinNT/2K/XP
+ * FILE:             access.c
+ * PROGRAMMER:       Matt Wu <mattwu@163.com>
+ * HOMEPAGE:         http://www.ext2fsd.com
+ * UPDATE HISTORY:
+ */
+
+/* INCLUDES *****************************************************************/
+
+#include "ext2fs.h"
+
+/* GLOBALS ***************************************************************/
+
+extern PEXT2_GLOBAL Ext2Global;
+
+/* DEFINITIONS *************************************************************/
+
+int Ext2CheckInodeAccess(PEXT2_VCB Vcb, struct inode *in, int attempt)
+{
+    int granted = 0;
+
+    uid_t uid = Vcb->uid;
+    gid_t gid = Vcb->gid;
+
+    if (IsFlagOn(Vcb->Flags, VCB_USER_EIDS)) {
+        uid = Vcb->euid;
+        gid = Vcb->egid;
+    }
+
+    if (!uid || uid == in->i_uid) {
+        /* grant all access for inode owner or root */
+        granted = Ext2FileCanRead | Ext2FileCanWrite | Ext2FileCanExecute;
+    } else if (gid == in->i_gid) {
+        if (Ext2IsGroupReadOnly(in->i_mode))
+            granted = Ext2FileCanRead | Ext2FileCanExecute;
+        else if (Ext2IsGroupWritable(in->i_mode))
+            granted = Ext2FileCanRead | Ext2FileCanWrite | Ext2FileCanExecute;
+    } else {
+        if (Ext2IsOtherReadOnly(in->i_mode))
+            granted = Ext2FileCanRead | Ext2FileCanExecute;
+        else if (Ext2IsOtherWritable(in->i_mode))
+            granted = Ext2FileCanRead | Ext2FileCanWrite | Ext2FileCanExecute;
+
+    }
+
+    return IsFlagOn(granted, attempt);
+}
+
+int Ext2CheckFileAccess(PEXT2_VCB Vcb, PEXT2_MCB Mcb, int attempt)
+{
+    return Ext2CheckInodeAccess(Vcb, &Mcb->Inode, attempt);
+}