From 7bb8900e1209a2abf3d83e7f06e2dfb314cef61e Mon Sep 17 00:00:00 2001
From: Michael Vrable <mvrable@cs.ucsd.edu>
Date: Wed, 20 Jan 2010 15:59:10 -0800
Subject: [PATCH] Add support for dumping filesystem state for debugging
 purposes.

---
 bluesky/CMakeLists.txt |  4 ++--
 bluesky/bluesky.h      |  2 ++
 bluesky/debug.c        | 46 ++++++++++++++++++++++++++++++++++++++++++
 nfs3/rpc.c             |  5 +++--
 4 files changed, 53 insertions(+), 4 deletions(-)
 create mode 100644 bluesky/debug.c

diff --git a/bluesky/CMakeLists.txt b/bluesky/CMakeLists.txt
index b1e7343..e380312 100644
--- a/bluesky/CMakeLists.txt
+++ b/bluesky/CMakeLists.txt
@@ -2,8 +2,8 @@ include_directories("${LIBS3_BUILD_DIR}/include")
 link_directories("${LIBS3_BUILD_DIR}/lib")
 
 add_library(bluesky SHARED
-            cache.c crypto.c dir.c file.c init.c inode.c serialize.c store.c
-            s3store.c util.c)
+            cache.c crypto.c debug.c dir.c file.c init.c inode.c serialize.c
+            store.c s3store.c util.c)
 add_executable(bluesky-test main.c)
 
 set(CMAKE_C_FLAGS "-Wall -std=gnu99 ${CMAKE_C_FLAGS}")
diff --git a/bluesky/bluesky.h b/bluesky/bluesky.h
index 59814b1..41618b5 100644
--- a/bluesky/bluesky.h
+++ b/bluesky/bluesky.h
@@ -237,6 +237,8 @@ gint bluesky_dirent_compare(gconstpointer a, gconstpointer b,
 
 void bluesky_flushd_invoke(BlueSkyFS *fs);
 
+void bluesky_debug_dump(BlueSkyFS *fs);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/bluesky/debug.c b/bluesky/debug.c
new file mode 100644
index 0000000..b030b7f
--- /dev/null
+++ b/bluesky/debug.c
@@ -0,0 +1,46 @@
+/* Blue Sky: File Systems in the Cloud
+ *
+ * Copyright (C) 2009  The Regents of the University of California
+ * Written by Michael Vrable <mvrable@cs.ucsd.edu>
+ *
+ * TODO: Licensing
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <glib.h>
+#include <string.h>
+
+#include "bluesky-private.h"
+
+/* Debugging support for BlueSky. */
+
+static void inode_dump(gpointer key, gpointer value, gpointer user_data)
+{
+    BlueSkyInode *inode = (BlueSkyInode *)value;
+
+    g_print("Inode %"PRIu64":\n", inode->inum);
+
+    gboolean locked = FALSE;
+    if (g_mutex_trylock(inode->lock)) {
+        locked = TRUE;
+        g_mutex_unlock(inode->lock);
+    }
+    g_print("    Locked: %c   Refcount: %d\n",
+            locked ? 'T' : 'F', inode->refcount);
+
+    g_print("    Type: %d   Mode: %o\n", inode->type, inode->mode);
+    g_print("    change_count = %"PRIu64", change_commit = %"PRIu64"\n",
+            inode->change_count, inode->change_commit);
+}
+
+/* Dump a summary of filesystem state as it is cached in memory. */
+void bluesky_debug_dump(BlueSkyFS *fs)
+{
+    g_print("*** DEBUG DUMP FOR FILESYSTEM %s ***\n", fs->name);
+    g_print("Cached inodes: %u\tNext inode: %"PRIu64"\n",
+            g_hash_table_size(fs->inodes), fs->next_inum);
+
+    g_hash_table_foreach(fs->inodes, inode_dump, fs);
+}
diff --git a/nfs3/rpc.c b/nfs3/rpc.c
index 92c17c8..468c58c 100644
--- a/nfs3/rpc.c
+++ b/nfs3/rpc.c
@@ -295,6 +295,8 @@ nfs_program_3(RPCRequest *req)
     xdrproc_t _xdr_argument, _xdr_result;
     char *(*local)(char *, RPCRequest *);
 
+    printf("Dispatched NFS RPC message type %d\n", req->req_proc);
+
     switch (req->req_proc) {
     case NFSPROC3_NULL:
         _xdr_argument = (xdrproc_t) xdr_void;
@@ -449,6 +451,7 @@ nfs_program_3(RPCRequest *req)
     result = (*local)((char *)req->args, req);
 
     bluesky_flushd_invoke(fs);
+    bluesky_debug_dump(fs);
 
     return;
 }
@@ -632,7 +635,6 @@ static gboolean async_rpc_do_read(GIOChannel *channel,
             rpc->frag_len = ntohl(rpc->frag_len);
             g_string_set_size(rpc->msgbuf, rpc->msgbuf->len - 4);
             rpc->frag_hdr_bytes = 0;
-            g_print("RPC fragment header: %08x\n", rpc->frag_len);
         }
     } else {
         /* We were reading in the fragment body. */
@@ -641,7 +643,6 @@ static gboolean async_rpc_do_read(GIOChannel *channel,
         if (rpc->frag_len = 0x80000000) {
             /* We have a complete message since this was the last fragment and
              * there are no more bytes in it.  Dispatch the message. */
-            g_print("Complete RPC message: %zd bytes\n", rpc->msgbuf->len);
             if (!async_rpc_dispatch(rpc)) {
                 fprintf(stderr, "Invalid RPC message, closing channel\n");
                 g_io_channel_shutdown(rpc->channel, TRUE, NULL);
-- 
2.20.1