From e058c53f7c59814d8a0235afb2d175cb976c341e Mon Sep 17 00:00:00 2001
From: ericm <ericm>
Date: Mon, 29 Aug 2005 20:59:19 +0000
Subject: [PATCH] hack to always use root credential between client and oss.

---
 lustre/include/linux/lustre_sec.h |  1 +
 lustre/llite/llite_lib.c          | 24 ++++++++++++++++--------
 lustre/sec/sec.c                  |  3 ++-
 3 files changed, 19 insertions(+), 9 deletions(-)

diff --git a/lustre/include/linux/lustre_sec.h b/lustre/include/linux/lustre_sec.h
index 5ccafab..56ca8f5 100644
--- a/lustre/include/linux/lustre_sec.h
+++ b/lustre/include/linux/lustre_sec.h
@@ -281,6 +281,7 @@ struct ptlrpc_sec_type {
 #define PTLRPC_SEC_FL_MDS               0x0001 /* outgoing from MDS */
 #define PTLRPC_SEC_FL_REVERSE           0x0002 /* reverse sec */
 #define PTLRPC_SEC_FL_PAG               0x0004 /* enable PAG */
+#define PTLRPC_SEC_FL_OSS               0x0008 /* outgoing to OSS XXX */
 
 #define PTLRPC_CREDCACHE_NR     8
 #define PTLRPC_CREDCACHE_MASK   (PTLRPC_CREDCACHE_NR - 1)
diff --git a/lustre/llite/llite_lib.c b/lustre/llite/llite_lib.c
index fc68447..2b5ff01 100644
--- a/lustre/llite/llite_lib.c
+++ b/lustre/llite/llite_lib.c
@@ -263,15 +263,23 @@ static int lustre_connect_ost(struct super_block *sb, char *lov,
                 RETURN(err);
         }
 
-        if (pag) {
+        /* FIXME Because of the async nature of file i/o, we never know
+         * who is actually dirty the pages; and any process have chance
+         * to trigger dirty-flushing within its own process context. So
+         * for simplicity we simply use root's credential, we suppose root
+         * always have credential.
+         */
+        if (pag)
                 sec_flags = PTLRPC_SEC_FL_PAG;
-                err = obd_set_info(obd->obd_self_export,
-                                   strlen("sec_flags"), "sec_flags",
-                                   sizeof(sec_flags), &sec_flags);
-                if (err) {
-                        OBD_FREE(data, sizeof(*data));
-                        RETURN(err);
-                }
+        else
+                sec_flags = PTLRPC_SEC_FL_OSS;
+
+        err = obd_set_info(obd->obd_self_export,
+                           strlen("sec_flags"), "sec_flags",
+                           sizeof(sec_flags), &sec_flags);
+        if (err) {
+                OBD_FREE(data, sizeof(*data));
+                RETURN(err);
         }
 
         err = obd_connect(&dt_conn, obd, &sbi->ll_sb_uuid, data, 0);
diff --git a/lustre/sec/sec.c b/lustre/sec/sec.c
index a9f4e56..40f892a 100644
--- a/lustre/sec/sec.c
+++ b/lustre/sec/sec.c
@@ -419,7 +419,8 @@ static struct ptlrpc_cred *get_cred(struct ptlrpc_sec *sec)
 
         LASSERT(sec);
 
-        if (sec->ps_flags & (PTLRPC_SEC_FL_MDS | PTLRPC_SEC_FL_REVERSE)) {
+        if (sec->ps_flags &
+            (PTLRPC_SEC_FL_MDS | PTLRPC_SEC_FL_OSS | PTLRPC_SEC_FL_REVERSE)) {
                 vcred.vc_pag = 0;
                 vcred.vc_uid = 0;
         } else {
-- 
1.8.3.1