From: bobijam <bobijam>
Date: Thu, 6 Mar 2008 02:44:03 +0000 (+0000)
Subject: Branch HEAD
X-Git-Tag: v1_7_0_51~169
X-Git-Url: https://git.whamcloud.com/?a=commitdiff_plain;h=1dda8fc259e1b8797b69224478ac927a1d57e9ea;p=fs%2Flustre-release.git

Branch HEAD
b=13715
i=johann
i=nathan
i=adilger

protect accessing imp->generation w/ imp_lock.
---

diff --git a/lustre/ptlrpc/import.c b/lustre/ptlrpc/import.c
index 1dfd0a5..35f5c1f 100644
--- a/lustre/ptlrpc/import.c
+++ b/lustre/ptlrpc/import.c
@@ -163,15 +163,12 @@ int ptlrpc_set_import_discon(struct obd_import *imp, __u32 conn_cnt)
         return rc;
 }
 
-/*
- * This acts as a barrier; all existing requests are rejected, and
- * no new requests will be accepted until the import is valid again.
- */
-void ptlrpc_deactivate_import(struct obd_import *imp)
+/* Must be called with imp_lock held! */
+static void ptlrpc_deactivate_and_unlock_import(struct obd_import *imp)
 {
         ENTRY;
+        LASSERT_SPIN_LOCKED(&imp->imp_lock);
 
-        spin_lock(&imp->imp_lock);
         if (imp->imp_invalid) {
                 spin_unlock(&imp->imp_lock);
                 EXIT;
@@ -190,6 +187,16 @@ void ptlrpc_deactivate_import(struct obd_import *imp)
 }
 
 /*
+ * This acts as a barrier; all existing requests are rejected, and
+ * no new requests will be accepted until the import is valid again.
+ */
+void ptlrpc_deactivate_import(struct obd_import *imp)
+{
+        spin_lock(&imp->imp_lock);
+        ptlrpc_deactivate_and_unlock_import(imp);
+}
+
+/*
  * This function will invalidate the import, if necessary, then block
  * for all the RPC completions, and finally notify the obd to
  * invalidate its state (ie cancel locks, clear pending requests,
@@ -805,9 +812,12 @@ finish:
 out:
         if (rc != 0) {
                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
+                spin_lock(&imp->imp_lock);
                 if (aa->pcaa_initial_connect && !imp->imp_initial_recov &&
                     (request->rq_import_generation == imp->imp_generation))
-                        ptlrpc_deactivate_import(imp);
+                        ptlrpc_deactivate_and_unlock_import(imp);
+                else
+                        spin_unlock(&imp->imp_lock);
 
                 if ((imp->imp_recon_bk && imp->imp_last_recon) ||
                     (rc == -EACCES)) {