[PVFS2-CVS] commit by neill in pvfs2/src/client/sysint: acache.c acache.h fs-add.c

[CVS commit program]

Update of /projects/cvsroot/pvfs2/src/client/sysint
In directory parlweb:/tmp/cvs-serv8193/src/client/sysint

Modified Files:
	acache.c acache.h fs-add.c 
Log Message:
- fixed typo in fs-remove comment
- fixed fs-remove by making sure we reload the cached config
  information (to avoid keeping no longer valid fs data/mapping in
  memory, even though it shouldn't be referenced)
- apply Nathan's acache.patch first referenced at:

http://www.beowulf-underground.org/pipermail/pvfs2-developers/2004-July/000737.html

but with the following changes:
- used long option of --acache-timeout instead of --acache
- updated print_help information to reflect that
- bounded the timeout to the smallest (run-time determined) handle
  recycle timeout based on dynamic mounts from the servers
- this required a way to reinitialize the acache at run-time to be
  sure there are no cached entries with old timeouts
- adopted the following behaviour when the user specifies a huge
  timeout value:
  1) init the acache to that value on startup (won't be used at all)
  2) on mount, use the min of that value and the min handle recycle
     time based on server configs and reinitialize the acache
  3) on unmount, use the (potentially new) min of the cmdline value
     and the min handle recycle time based on server configs and
     reinit the acache (the new min can be higher than the last, so
     this tries to keep it closer to the big user specified timeout)


Index: acache.c
===================================================================
RCS file: /projects/cvsroot/pvfs2/src/client/sysint/acache.c,v
diff -p -u -r1.13 -r1.14
--- acache.c	28 Jul 2004 14:32:30 -0000	1.13
+++ acache.c	28 Jul 2004 17:05:13 -0000	1.14
@@ -148,6 +148,12 @@ void PINT_acache_finalize()
     acache_debug("PINT_acache_finalize exiting\n");
 }
 
+int PINT_acache_reinitialize(void)
+{
+    PINT_acache_finalize();
+    return PINT_acache_initialize();
+}
+
 /*
   internal use only -- does a lookup without involving the pinode
   locks or reference counts; always done with the interface lock and

Index: acache.h
===================================================================
RCS file: /projects/cvsroot/pvfs2/src/client/sysint/acache.h,v
diff -p -u -r1.7 -r1.8
--- acache.h	28 Jul 2004 14:32:30 -0000	1.7
+++ acache.h	28 Jul 2004 17:05:13 -0000	1.8
@@ -102,6 +102,7 @@ typedef struct
 
 int PINT_acache_initialize(void);
 void PINT_acache_finalize(void);
+int PINT_acache_reinitialize(void);
 int PINT_acache_get_timeout(void);
 void PINT_acache_set_timeout(int max_timeout_ms);
 int PINT_acache_get_size(void);

Index: fs-add.c
===================================================================
RCS file: /projects/cvsroot/pvfs2/src/client/sysint/fs-add.c,v
diff -p -u -r1.19 -r1.20
--- fs-add.c	28 Jul 2004 14:32:31 -0000	1.19
+++ fs-add.c	28 Jul 2004 17:05:13 -0000	1.20
@@ -130,10 +130,11 @@ int PVFS_sys_fs_add(struct PVFS_sys_mnte
     return ret;
 }
 
-/* PVFS_sys_fs_add()
+/* PVFS_sys_fs_remove()
  *
  * tells the system interface to dynamically "unmount" a mounted file
- * system
+ * system by removing the configuration info and reloading the cached
+ * configuration interface
  *
  * returns 0 on success, -PVFS_error on failure
  */
@@ -153,6 +154,12 @@ int PVFS_sys_fs_remove(struct PVFS_sys_m
                 PVFS_perror_gossip("PINT_server_config_mgr_remove_config "
                             "failed", ret);
             }
+
+            /*
+              reload all handle mappings as well as the interface with
+              the new configuration information
+            */
+            PINT_server_config_mgr_reload_cached_config_interface();
         }
         gen_mutex_unlock(&mt_config);
     }