From 7b62fa0c4b6577a2e702e972f71afbb5f0eb9556 Mon Sep 17 00:00:00 2001
From: adilger <adilger>
Date: Thu, 4 Mar 2004 08:10:13 +0000
Subject: [PATCH] Don't call the completion AST if we can already match this
 lock. We could fix some callers of obd_match() and ldlm_lock_match() to be a
 bit more efficient, but we won't right now. r=phil

---
 lustre/ldlm/ldlm_lock.c  | 30 +++++++++++++++++++-----------
 lustre/liblustre/rw.c    |  5 +++--
 lustre/liblustre/super.c |  1 +
 3 files changed, 23 insertions(+), 13 deletions(-)

diff --git a/lustre/ldlm/ldlm_lock.c b/lustre/ldlm/ldlm_lock.c
index 1234786..eb3c50c 100644
--- a/lustre/ldlm/ldlm_lock.c
+++ b/lustre/ldlm/ldlm_lock.c
@@ -676,22 +676,30 @@ int ldlm_lock_match(struct ldlm_namespace *ns, int flags,
         l_unlock(&ns->ns_lock);
 
         if (lock) {
-                struct l_wait_info lwi;
                 ldlm_lock2handle(lock, lockh);
-                if (lock->l_completion_ast)
-                        lock->l_completion_ast(lock, LDLM_FL_WAIT_NOREPROC,
-                                               NULL);
+                if (!(lock->l_flags & LDLM_FL_CAN_MATCH)) {
+                        struct l_wait_info lwi;
+                        if (lock->l_completion_ast)
+                                lock->l_completion_ast(lock,
+                                                       LDLM_FL_WAIT_NOREPROC,
+                                                       NULL);
 
-                lwi = LWI_TIMEOUT_INTR(obd_timeout * HZ, NULL, NULL, NULL);
+                        lwi = LWI_TIMEOUT_INTR(obd_timeout*HZ, NULL,NULL,NULL);
 
-                /* XXX FIXME see comment about CAN_MATCH in lustre_dlm.h */
-                l_wait_event(lock->l_waitq,
-                             (lock->l_flags & LDLM_FL_CAN_MATCH), &lwi);
+                        /* XXX FIXME see comment on CAN_MATCH in lustre_dlm.h */
+                        l_wait_event(lock->l_waitq,
+                                     (lock->l_flags & LDLM_FL_CAN_MATCH), &lwi);
+                }
         }
         if (rc)
-                LDLM_DEBUG(lock, "matched");
-        else
-                LDLM_DEBUG_NOLOCK("not matched");
+                LDLM_DEBUG(lock, "matched ("LPU64" "LPU64")",
+                           type == LDLM_PLAIN ? res_id->name[2] :
+                                policy->l_extent.start,
+                           type == LDLM_PLAIN ? res_id->name[3] :
+                                policy->l_extent.end);
+        else if (!(flags & LDLM_FL_TEST_LOCK)) /* less verbose for test-only */
+                LDLM_DEBUG_NOLOCK("not matched type %u mode %u res "LPU64"/"LPU64,
+                                  type, mode, res_id->name[0], res_id->name[1]);
 
         if (old_lock)
                 LDLM_LOCK_PUT(old_lock);
diff --git a/lustre/liblustre/rw.c b/lustre/liblustre/rw.c
index 307dd46..8e5f59f 100644
--- a/lustre/liblustre/rw.c
+++ b/lustre/liblustre/rw.c
@@ -153,17 +153,18 @@ int llu_extent_lock(struct ll_file_data *fd, struct inode *inode,
         size_lock.end = OBD_OBJECT_EOF;
 
         /* XXX I bet we should be checking the lock ignore flags.. */
+        /* FIXME use LDLM_FL_TEST_LOCK instead */
         flags = LDLM_FL_CBPENDING | LDLM_FL_BLOCK_GRANTED;
         matched = obd_match(exp, lsm, LDLM_EXTENT, &size_lock,
                             sizeof(size_lock), LCK_PR, &flags, inode,
                             &match_lockh);
 
-        /* hey, alright, we hold a size lock that covers the size we 
+        /* hey, alright, we hold a size lock that covers the size we
          * just found, its not going to change for a while.. */
         if (matched == 1) {
                 set_bit(LLI_F_HAVE_OST_SIZE_LOCK, &lli->lli_flags);
                 obd_cancel(exp, lsm, LCK_PR, &match_lockh);
-        } 
+        }
 
         RETURN(0);
 }
diff --git a/lustre/liblustre/super.c b/lustre/liblustre/super.c
index 1e6a230..28b9e66 100644
--- a/lustre/liblustre/super.c
+++ b/lustre/liblustre/super.c
@@ -355,6 +355,7 @@ static int llu_have_md_lock(struct inode *inode)
 
         CDEBUG(D_INFO, "trying to match res "LPU64"\n", res_id.name[0]);
 
+        /* FIXME use LDLM_FL_TEST_LOCK instead */
         flags = LDLM_FL_BLOCK_GRANTED | LDLM_FL_CBPENDING;
         if (ldlm_lock_match(obddev->obd_namespace, flags, &res_id, LDLM_PLAIN,
                             NULL, 0, LCK_PR, &lockh)) {
-- 
1.8.3.1