From e679a64ba3e622da4b4ea10df0baebe0b88e61af Mon Sep 17 00:00:00 2001
From: pschwan <pschwan>
Date: Tue, 17 Sep 2002 19:00:13 +0000
Subject: [PATCH] b=596503 b=608680 Reenable bits of dentry caching by doing
 lock matching for LOOKUP intents in ll_revalidate2.

---
 lustre/llite/dcache.c | 28 +++++++++++++++++++++++++++-
 lustre/llite/namei.c  |  2 +-
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/lustre/llite/dcache.c b/lustre/llite/dcache.c
index 631dd9a..a0274d6 100644
--- a/lustre/llite/dcache.c
+++ b/lustre/llite/dcache.c
@@ -46,9 +46,35 @@ void ll_intent_release(struct dentry *de)
 
 int ll_revalidate2(struct dentry *de, int flags, struct lookup_intent *it)
 {
+        struct ll_sb_info *sbi = ll_s2sbi(de->d_sb);
+        struct lustre_handle lockh;
+        __u64 res_id[RES_NAME_SIZE] = {0};
+        struct obd_device *obddev;
         ENTRY;
 
-        /* for debugging purposes, we currently always force client re-get */
+        if (it)
+                RETURN(0); /* lookups will have NULL it */
+
+        if (!de->d_inode)
+                RETURN(0);
+
+        obddev = class_conn2obd(&sbi->ll_mdc_conn);
+        res_id[0] = de->d_inode->i_ino;
+
+        CDEBUG(D_INFO, "trying to match res "LPU64"\n", res_id[0]);
+
+        if (ldlm_lock_match(obddev->obd_namespace, res_id, LDLM_MDSINTENT,
+                            NULL, 0, LCK_PR, &lockh)) {
+                ldlm_lock_decref(&lockh, LCK_PR);
+                RETURN(1);
+        }
+
+        if (ldlm_lock_match(obddev->obd_namespace, res_id, LDLM_MDSINTENT,
+                            NULL, 0, LCK_PW, &lockh)) {
+                ldlm_lock_decref(&lockh, LCK_PW);
+                RETURN(1);
+        }
+
         RETURN(0);
 }
 
diff --git a/lustre/llite/namei.c b/lustre/llite/namei.c
index d780ca4..b562dc6 100644
--- a/lustre/llite/namei.c
+++ b/lustre/llite/namei.c
@@ -115,7 +115,7 @@ int ll_lock(struct inode *dir, struct dentry *dentry,
                 tgtlen = strlen(tgt);
                 it->it_data = NULL;
         } else if (it->it_op & IT_LOOKUP)
-                lock_mode = LCK_CR;
+                lock_mode = LCK_PR;
         else {
                 LBUG();
                 RETURN(-EINVAL);
-- 
1.8.3.1