From: Michael Vrable <mvrable@cs.ucsd.edu>
Date: Mon, 25 Jan 2010 03:37:45 +0000 (-0800)
Subject: NFS cache writeback is now invoked periodically by a timer.
X-Git-Url: http://git.vrable.net/?p=bluesky.git;a=commitdiff_plain;h=f57fa12ec60108a9338ca5c5c072ec6e0ea1b745

NFS cache writeback is now invoked periodically by a timer.

Previously we didn't have timers set up and simply called the writeback
code after each operation (which could mean writeback wasn't invoked for
long stretches of time).
---

diff --git a/bluesky/debug.c b/bluesky/debug.c
index b030b7f..023b99f 100644
--- a/bluesky/debug.c
+++ b/bluesky/debug.c
@@ -22,9 +22,9 @@ static void inode_dump(gpointer key, gpointer value, gpointer user_data)
 
     g_print("Inode %"PRIu64":\n", inode->inum);
 
-    gboolean locked = FALSE;
+    gboolean locked = TRUE;
     if (g_mutex_trylock(inode->lock)) {
-        locked = TRUE;
+        locked = FALSE;
         g_mutex_unlock(inode->lock);
     }
     g_print("    Locked: %c   Refcount: %d\n",
diff --git a/bluesky/inode.c b/bluesky/inode.c
index 377364c..4a158c7 100644
--- a/bluesky/inode.c
+++ b/bluesky/inode.c
@@ -148,6 +148,7 @@ BlueSkyInode *bluesky_new_inode(uint64_t inum, BlueSkyFS *fs,
     i->type = type;
     i->fs = fs;
     i->inum = inum;
+    i->change_count = 1;
 
     switch (type) {
     case BLUESKY_REGULAR:
diff --git a/nfs3/rpc.c b/nfs3/rpc.c
index 7b73840..a7d108c 100644
--- a/nfs3/rpc.c
+++ b/nfs3/rpc.c
@@ -471,7 +471,6 @@ nfs_program_3(RPCRequest *req)
     req->xdr_result = _xdr_result;
     result = (*local)((char *)req->args, req);
 
-    bluesky_flushd_invoke(fs);
     bluesky_debug_dump(fs);
 
     return;
@@ -483,10 +482,22 @@ nfs_program_3(RPCRequest *req)
 static GMainContext *main_context;
 static GMainLoop *main_loop;
 
+static gboolean async_flushd(gpointer data)
+{
+    bluesky_flushd_invoke(fs);
+    return TRUE;
+}
+
 static async_rpc_init()
 {
     main_context = g_main_context_new();
     main_loop = g_main_loop_new(main_context, FALSE);
+
+    /* Arrange to have the cache writeback code run every five seconds. */
+    GSource *source = g_timeout_source_new_seconds(5);
+    g_source_set_callback(source, async_flushd, NULL, NULL);
+    g_source_attach(source, main_context);
+    g_source_unref(source);
 }
 
 struct rpc_call_header {