windows-registry-OfflineReadOnlyIsValid-20071019

Add registry value "OfflineReadOnlyIsValid" option.  When set to non-zero
value, an offline or down read only volume will be treated as if it has
a valid callback even if it doesn't.

src/WINNT/afsd/afsd_init.c

@@ -41,6 +41,7 @@ extern afs_int32 cryptall;
 extern int cm_enableServerLocks;
 extern int cm_deleteReadOnly;
 extern afs_int32 cm_BPlusTrees;
+extern afs_int32 cm_OfflineROIsValid;
 extern const char **smb_ExecutableExtensions;
 
 osi_log_t *afsd_logp;
@@ -1106,6 +1107,14 @@ int afsd_InitCM(char **reasonP)
     if (!smb_ExecutableExtensions)
         afsi_log("No PrefetchExecutableExtensions");
 
+    dummyLen = sizeof(DWORD);
+    code = RegQueryValueEx(parmKey, "OfflineReadOnlyIsValid", NULL, NULL,
+                           (BYTE *) &dwValue, &dummyLen);
+    if (code == ERROR_SUCCESS) {
+        cm_OfflineROIsValid = (unsigned short) dwValue;
+    } 
+    afsi_log("CM OfflineReadOnlyIsValid is %u", cm_deleteReadOnly);
+    
     RegCloseKey (parmKey);
 
     cacheBlocks = ((afs_uint64)cacheSize * 1024) / blockSize;

src/WINNT/afsd/cm_callback.c

@@ -30,6 +30,8 @@
 /* read/write lock for all global storage in this module */
 osi_rwlock_t cm_callbackLock;
 
+afs_int32 cm_OfflineROIsValid = 0;
+
 #ifdef AFS_FREELANCE_CLIENT
 extern osi_mutex_t cm_Freelance_Lock;
 #endif
@@ -1483,10 +1485,20 @@ int cm_HaveCallback(cm_scache_t *scp)
     }
 #endif
 
-    if (scp->cbServerp != NULL)
+    if (scp->cbServerp != NULL) {
 	return 1;
-    else 
+    } else if (cm_OfflineROIsValid) {
+        switch (cm_GetVolumeStatus(scp->volp, scp->fid.volume)) {
+        case vl_offline:
+        case vl_alldown:
+        case vl_unknown:
+            return 1;
+        default:
+            return 0;
+        }
+    } else {
         return 0;
+    }
 }
 
 /* need to detect a broken callback that races with our obtaining a callback.

src/WINNT/afsd/cm_callback.h

@@ -72,4 +72,5 @@ extern void cm_GiveUpAllCallbacks(cm_server_t *tsp, afs_int32 markDown);
 
 extern void cm_GiveUpAllCallbacksAllServers(afs_int32 markDown);
 
+extern afs_int32 cm_OfflineROIsValid;
 #endif /*  _CM_CALLBACK_H_ENV__ */

src/WINNT/afsd/cm_volume.c

@@ -1480,3 +1480,17 @@ void cm_VolumeStatusNotification(cm_volume_t * volp, afs_uint32 volID, enum vols
 
     cm_VolStatus_Change_Notification(volp->cellp->cellID, volID, new);
 }       
+
+enum volstatus cm_GetVolumeStatus(cm_volume_t *volp, afs_uint32 volID)
+{
+    if (volp->rw.ID == volID) {
+        return volp->rw.state;
+    } else if (volp->ro.ID == volID) {
+        return volp->ro.state;
+    } else if (volp->bk.ID == volID) {
+        return volp->bk.state;
+    } else {
+        return vl_unknown;
+    }
+}
+

src/WINNT/afsd/cm_volume.h

@@ -118,4 +118,5 @@ extern void cm_UpdateVolumeStatus(cm_volume_t *volp, afs_uint32 volID);
 
 extern void cm_VolumeStatusNotification(cm_volume_t * volp, afs_uint32 volID, enum volstatus old, enum volstatus new);
 
+extern enum volstatus cm_GetVolumeStatus(cm_volume_t *volp, afs_uint32 volID);
 #endif /*  __CM_VOLUME_H_ENV__ */