From ba750d2daecfd5172a2984428e4f9190003fe0e3 Mon Sep 17 00:00:00 2001
From: Steve Dickson <steved@redhat.com>
Date: Tue, 27 Jul 2010 07:51:04 -0400
Subject: Added file mode decoding

Signed-off-by: Steve Dickson <steved@redhat.com>
---
 nfsd/nfsd_permission.stp | 15 ++++++++++++---
 tapset/inode.stp         | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+), 3 deletions(-)

diff --git a/nfsd/nfsd_permission.stp b/nfsd/nfsd_permission.stp
index 1b77df1..63969a9 100644
--- a/nfsd/nfsd_permission.stp
+++ b/nfsd/nfsd_permission.stp
@@ -1,16 +1,25 @@
 #!/usr/bin/env stap
 
+global acl_inode, acl_mask, acl_check;
+
 probe module("nfsd").function("nfsd_permission")
 {
-	printf("nfsd_permission: rqstp %p exp %p dentry '%s' acc 0x%x\n", 
-		$rqstp, $exp, dentry2name($dentry), $acc);
+	printf("nfsd_permission: rqstp %p exp %p dentry '%s' %s\n", 
+		$rqstp, $exp, dentry2name($dentry), file_modes($acc));
 	printf("               : %s\n", svc_export_dump($exp));
 }
 %( kernel_v >= "2.6.25" %?
+probe kernel.function("acl_permission_check")
+{
+	acl_inode = $inode;
+	acl_mask = $mask;
+	acl_check = $check_acl;
+}
 probe kernel.function("acl_permission_check").return
 {
 		if ($return)
-			printf("    acl_permission_check: error: %d\n", $return);
+			printf("    acl_permission_check: inode 0x%p uid %s  %s error: %d\n", 
+				acl_inode, inode_uid(acl_inode), file_modes(acl_mask), $return);
 }
 /*
  a very busy probe
diff --git a/tapset/inode.stp b/tapset/inode.stp
index 106cba1..56340d0 100644
--- a/tapset/inode.stp
+++ b/tapset/inode.stp
@@ -1,5 +1,6 @@
 %{
 #include <linux/kernel.h>
+#include <linux/fs.h>
 %}
 
 function inode_uid:string(_ino:long)
@@ -11,3 +12,41 @@ function inode_uid:string(_ino:long)
 
 	CATCH_DEREF_FAULT();
 %}
+
+function file_modes:string(_m:long)
+%{
+	char buf[MAXSTRINGLEN];
+	int cc=0;
+	int _mod = (long) kread(&(THIS->_m));
+	
+	if (_mod & MAY_EXEC) {
+		sprintf(buf+cc, "EXEC|");
+		cc = strlen(buf);
+	}
+	if (_mod & MAY_WRITE) {
+		sprintf(buf+cc, "WRITE|");
+		cc = strlen(buf);
+	}
+	if (_mod & MAY_READ) {
+		sprintf(buf+cc, "READ|");
+		cc = strlen(buf);
+	}
+	if (_mod & MAY_APPEND) {
+		sprintf(buf+cc, "APPEND|");
+		cc = strlen(buf);
+	}
+	if (_mod & MAY_ACCESS) {
+		sprintf(buf+cc, "ACCESS|");
+		cc = strlen(buf);
+	}
+	if (_mod & MAY_OPEN) {
+		sprintf(buf+cc, "OPEN|");
+		cc = strlen(buf);
+	}
+	if (cc)
+		snprintf(THIS->__retvalue, MAXSTRINGLEN, "mode 0%o (%s)", _mod, buf);
+	else
+		snprintf(THIS->__retvalue, MAXSTRINGLEN, "mode 0%o", _mod);
+
+	CATCH_DEREF_FAULT();
+%}
-- 
cgit