TAKE2[PATCH BUG:213 1/1] Support for Process State Dump

Support for process state dump.

Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 213 (Support for process state dump)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=213

11 files changed, 740 insertions, 7 deletions

diff --git a/libglusterfs/src/Makefile.am b/libglusterfs/src/Makefile.am
index 7698661fa..a3fb923ca 100644
--- a/libglusterfs/src/Makefile.am
+++ b/libglusterfs/src/Makefile.am
@@ -6,9 +6,9 @@ libglusterfs_la_LIBADD = @LEXLIB@
 
 lib_LTLIBRARIES = libglusterfs.la
 
-libglusterfs_la_SOURCES = dict.c spec.lex.c y.tab.c xlator.c logging.c  hashfn.c defaults.c scheduler.c common-utils.c transport.c timer.c inode.c call-stub.c compat.c authenticate.c fd.c compat-errno.c event.c mem-pool.c gf-dirent.c syscall.c iobuf.c globals.c
+libglusterfs_la_SOURCES = dict.c spec.lex.c y.tab.c xlator.c logging.c  hashfn.c defaults.c scheduler.c common-utils.c transport.c timer.c inode.c call-stub.c compat.c authenticate.c fd.c compat-errno.c event.c mem-pool.c gf-dirent.c syscall.c iobuf.c globals.c statedump.c stack.c
 
-noinst_HEADERS = common-utils.h defaults.h dict.h glusterfs.h hashfn.h logging.h protocol.h scheduler.h xlator.h transport.h stack.h timer.h list.h inode.h call-stub.h compat.h authenticate.h fd.h revision.h compat-errno.h event.h mem-pool.h byte-order.h gf-dirent.h locking.h syscall.h iobuf.h globals.h
+noinst_HEADERS = common-utils.h defaults.h dict.h glusterfs.h hashfn.h logging.h protocol.h scheduler.h xlator.h transport.h stack.h timer.h list.h inode.h call-stub.h compat.h authenticate.h fd.h revision.h compat-errno.h event.h mem-pool.h byte-order.h gf-dirent.h locking.h syscall.h iobuf.h globals.h statedump.h
 
 EXTRA_DIST = spec.l spec.y
 
diff --git a/libglusterfs/src/fd.c b/libglusterfs/src/fd.c
index 8f7616929..62536fc55 100644
--- a/libglusterfs/src/fd.c
+++ b/libglusterfs/src/fd.c
@@ -21,6 +21,7 @@
 #include "glusterfs.h"
 #include "inode.h"
 #include "dict.h"
+#include "statedump.h"
 
 
 #ifndef _CONFIG_H
@@ -685,3 +686,69 @@ fd_ctx_del (fd_t *fd, xlator_t *xlator, uint64_t *value)
 
         return ret;
 }
+
+
+void
+fd_dump (fd_t *fd, char *prefix)
+{
+        char        key[GF_DUMP_MAX_BUF_LEN];
+        inode_t     *inode = NULL;
+
+        if (!fd)
+                return;
+    
+        memset(key, 0, sizeof(key));
+        gf_proc_dump_build_key(key, prefix, "pid");
+        gf_proc_dump_write(key, "%d", fd->pid);
+        gf_proc_dump_build_key(key, prefix, "refcount");
+        gf_proc_dump_write(key, "%d", fd->refcount);
+        gf_proc_dump_build_key(key, prefix, "flags");
+        gf_proc_dump_write(key, "%d", fd->flags);
+        gf_proc_dump_build_key(key, prefix, "inode");
+        gf_proc_dump_add_section(key);
+        inode_dump(inode, key, NULL);
+}
+
+
+void
+fdentry_dump (fdentry_t *fdentry, char *prefix)
+{
+        if (!fdentry)
+                return;
+
+        if (GF_FDENTRY_ALLOCATED != fdentry->next_free)
+                return;
+
+        if (fdentry->fd) 
+                fd_dump(fdentry->fd, prefix);
+}
+
+void
+fdtable_dump (fdtable_t *fdtable, char *prefix)
+{
+        char        key[GF_DUMP_MAX_BUF_LEN];
+        int         i = 0;
+
+        if (!fdtable)
+                return;
+    
+        memset(key, 0, sizeof(key));
+        gf_proc_dump_build_key(key, prefix, "refcount");
+        gf_proc_dump_write(key, "%d", fdtable->refcount);
+        gf_proc_dump_build_key(key, prefix, "maxfds");
+        gf_proc_dump_write(key, "%d", fdtable->max_fds);
+        gf_proc_dump_build_key(key, prefix, "first_free");
+        gf_proc_dump_write(key, "%d", fdtable->first_free);
+        gf_proc_dump_build_key(key, prefix, "lock");
+        gf_proc_dump_write(key, "%d", fdtable->lock);
+
+        for ( i = 0 ; i < fdtable->max_fds; i++) {
+                if (GF_FDENTRY_ALLOCATED == 
+                                fdtable->fdentries[i].next_free) {
+                        gf_proc_dump_build_key(key, prefix, "fdentry[%d]", i);
+                        gf_proc_dump_add_section(key);
+                        fdentry_dump(&fdtable->fdentries[i], key);
+                }
+        }
+}
+
diff --git a/libglusterfs/src/inode.c b/libglusterfs/src/inode.c
index 9796071d8..138e30068 100644
--- a/libglusterfs/src/inode.c
+++ b/libglusterfs/src/inode.c
@@ -24,6 +24,7 @@
 
 #include "inode.h"
 #include "common-utils.h"
+#include "statedump.h"
 #include <pthread.h>
 #include <sys/types.h>
 #include <stdint.h>
@@ -35,6 +36,18 @@
    move latest accessed dentry to list_head of inode
 */
 
+#define INODE_DUMP_LIST(head, key_buf, key_prefix, list_type, fn) \
+{ \
+        int i = 1;\
+        inode_t *inode = NULL;\
+        list_for_each_entry (inode, head, list) {\
+                gf_proc_dump_build_key(key_buf, key_prefix, "%s.%d",list_type,\
+                                i++);\
+                gf_proc_dump_add_section(key_buf);\
+                inode_dump(inode, key, fn);\
+        }\
+}
+
 static inode_t *
 __inode_unref (inode_t *inode);
 
@@ -1194,3 +1207,66 @@ unlock:
 
 	return ret;
 }
+
+void
+inode_dump (inode_t *inode, char *prefix, inode_priv_dump_fn fn)
+{
+        char key[GF_DUMP_MAX_BUF_LEN];
+        int  ret;
+
+        if (!inode) 
+                return;
+
+	ret = TRY_LOCK(&inode->lock);
+
+        if (ret != 0) {
+                gf_log("", GF_LOG_WARNING, "Unable to dump inode"
+                " errno: %d", errno);
+                return;
+        }
+
+        gf_proc_dump_build_key(key, prefix, "nlookup");
+        gf_proc_dump_write(key, "%ld", inode->nlookup);
+        gf_proc_dump_build_key(key, prefix, "generation");
+        gf_proc_dump_write(key, "%ld", inode->generation);
+        gf_proc_dump_build_key(key, prefix, "ref");
+        gf_proc_dump_write(key, "%u", inode->ref);
+        gf_proc_dump_build_key(key, prefix, "ino");
+        gf_proc_dump_write(key, "%ld", inode->ino);
+        gf_proc_dump_build_key(key, prefix, "st_mode");
+        gf_proc_dump_write(key, "%d", inode->st_mode);
+	UNLOCK(&inode->lock);
+        if (fn)
+                fn (inode);
+}
+
+void
+inode_table_dump (inode_table_t *itable, char *prefix, inode_priv_dump_fn fn)
+{
+    
+        char key[GF_DUMP_MAX_BUF_LEN];
+
+        if (!itable)
+                return;
+    
+        memset(key, 0, sizeof(key));
+        gf_proc_dump_build_key(key, prefix, "hashsize");
+        gf_proc_dump_write(key, "%d", itable->hashsize);
+        gf_proc_dump_build_key(key, prefix, "name");
+        gf_proc_dump_write(key, "%s", itable->name);
+    
+        gf_proc_dump_build_key(key, prefix, "lru_limit");
+        gf_proc_dump_write(key, "%d", itable->lru_limit);
+        gf_proc_dump_build_key(key, prefix, "active_size");
+        gf_proc_dump_write(key, "%d", itable->active_size);
+        gf_proc_dump_build_key(key, prefix, "lru_size");
+        gf_proc_dump_write(key, "%d", itable->lru_size);
+        gf_proc_dump_build_key(key, prefix, "purge_size");
+        gf_proc_dump_write(key, "%d", itable->purge_size);
+
+	pthread_mutex_lock(&itable->lock);
+        INODE_DUMP_LIST(&itable->active, key, prefix, "active", fn);
+        INODE_DUMP_LIST(&itable->lru, key, prefix, "lru", fn);
+        INODE_DUMP_LIST(&itable->purge, key, prefix, "purge", fn);
+}
+
diff --git a/libglusterfs/src/iobuf.c b/libglusterfs/src/iobuf.c
index 6d6fca133..e9408f86b 100644
--- a/libglusterfs/src/iobuf.c
+++ b/libglusterfs/src/iobuf.c
@@ -19,6 +19,7 @@
 
 
 #include "iobuf.h"
+#include "statedump.h"
 #include <stdio.h>
 
 
@@ -636,3 +637,106 @@ iobref_size (struct iobref *iobref)
 out:
         return size;
 }
+
+void 
+iobuf_info_dump (struct iobuf *iobuf, const char *key_prefix)
+{
+        char   key[GF_DUMP_MAX_BUF_LEN];
+        struct iobuf my_iobuf;
+        int    ret = 0;
+
+        if (!iobuf) 
+                return;
+
+        memset(&my_iobuf, 0, sizeof(my_iobuf));
+        
+        ret = TRY_LOCK(&iobuf->lock);
+        if (ret) {
+                gf_log("", GF_LOG_WARNING, "Unable to dump iobuf"
+                " errno: %d", errno);
+                return;
+        }
+        memcpy(&my_iobuf, iobuf, sizeof(my_iobuf));
+        UNLOCK(&iobuf->lock);
+
+	gf_proc_dump_build_key(key, key_prefix,"ref");
+        gf_proc_dump_write(key, "%d", my_iobuf.ref);
+	gf_proc_dump_build_key(key, key_prefix,"ptr");
+        gf_proc_dump_write(key, "%p", my_iobuf.ptr);
+
+}
+
+void 
+iobuf_arena_info_dump (struct iobuf_arena *iobuf_arena, const char *key_prefix)
+{
+	char key[GF_DUMP_MAX_BUF_LEN];
+	int  i = 1;
+        struct iobuf *trav;
+
+	if (!iobuf_arena)
+                return;
+
+        gf_proc_dump_build_key(key, key_prefix,"mem_base");
+        gf_proc_dump_write(key, "%p", iobuf_arena->mem_base);
+	gf_proc_dump_build_key(key, key_prefix, "active_cnt");
+        gf_proc_dump_write(key, "%d", iobuf_arena->active_cnt);
+	gf_proc_dump_build_key(key, key_prefix, "passive_cnt");
+        gf_proc_dump_write(key, "%d", iobuf_arena->passive_cnt);
+	list_for_each_entry (trav, &iobuf_arena->active.list, list) {
+                gf_proc_dump_build_key(key, key_prefix,"active_iobuf.%d", i++);
+                gf_proc_dump_add_section(key);
+                iobuf_info_dump(trav, key);
+        }
+
+        i = 1;
+        list_for_each_entry (trav, &iobuf_arena->passive.list, list) {
+                gf_proc_dump_build_key(key, key_prefix,
+                                        "passive_iobuf.%d",i++);
+                gf_proc_dump_add_section(key);
+                iobuf_info_dump(trav, key);
+        }
+
+}
+
+void
+iobuf_stats_dump (struct iobuf_pool *iobuf_pool)
+{
+    
+        char               msg[1024];
+        struct iobuf_arena *trav;
+        int                i = 1;
+        int                ret = -1;
+
+        if (!iobuf_pool)
+                return;
+
+        memset(msg, 0, sizeof(msg));
+
+        ret = pthread_mutex_trylock(&iobuf_pool->mutex);
+
+        if (ret) {
+                gf_log("", GF_LOG_WARNING, "Unable to dump iobuf pool"
+                " errno: %d", errno);
+                return;
+        }
+        gf_proc_dump_add_section("iobuf.global");
+        gf_proc_dump_write("iobuf.global.iobuf_pool","%p", iobuf_pool);
+        gf_proc_dump_write("iobuf.global.iobuf_pool.page_size", "%d",
+						 iobuf_pool->page_size);
+        gf_proc_dump_write("iobuf.global.iobuf_pool.arena_size", "%d",
+						 iobuf_pool->arena_size);
+        gf_proc_dump_write("iobuf.global.iobuf_pool.arena_cnt", "%d",
+						 iobuf_pool->arena_cnt);
+
+        list_for_each_entry (trav, &iobuf_pool->arenas.list, list) {
+                snprintf(msg, sizeof(msg), "iobuf.global.iobuf_pool.arena.%d",
+                                                                            i);
+		gf_proc_dump_add_section(msg);
+                iobuf_arena_info_dump(trav,msg);
+                i++;
+        }
+        
+        pthread_mutex_unlock(&iobuf_pool->mutex);
+
+        return;
+}
diff --git a/libglusterfs/src/iobuf.h b/libglusterfs/src/iobuf.h
index d17c1db48..de95da324 100644
--- a/libglusterfs/src/iobuf.h
+++ b/libglusterfs/src/iobuf.h
@@ -123,5 +123,6 @@ int iobref_merge (struct iobref *to, struct iobref *from);
 
 size_t iobuf_size (struct iobuf *iobuf);
 size_t iobref_size (struct iobref *iobref);
+void   iobuf_stats_dump (struct iobuf_pool *iobuf_pool);
 
 #endif /* !_IOBUF_H_ */
diff --git a/libglusterfs/src/stack.c b/libglusterfs/src/stack.c
new file mode 100644
index 000000000..453248479
--- /dev/null
+++ b/libglusterfs/src/stack.c
@@ -0,0 +1,171 @@
+/*
+  Copyright (c) 2009 Z RESEARCH, Inc. <http://www.zresearch.com>
+  This file is part of GlusterFS.
+
+  GlusterFS is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published
+  by the Free Software Foundation; either version 3 of the License,
+  or (at your option) any later version.
+
+  GlusterFS is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see
+  <http://www.gnu.org/licenses/>.
+*/
+
+#include "statedump.h"
+#include "stack.h"
+
+static inline
+int call_frames_count (call_frame_t *call_frame) 
+{
+        call_frame_t *pos;
+        int32_t count = 0;
+
+        if (!call_frame)
+                return count;
+
+        for (pos = call_frame; pos != NULL; pos = pos->next)
+                count++;
+
+        return count;
+}
+
+void
+gf_proc_dump_call_frame (call_frame_t *call_frame, const char *key_buf,...)
+{
+    
+        char prefix[GF_DUMP_MAX_BUF_LEN];
+        va_list ap;
+        char key[GF_DUMP_MAX_BUF_LEN];
+        call_frame_t my_frame;
+        int  ret = -1;
+
+        if (!call_frame)
+                return;
+
+        assert(key_buf);
+
+        memset(prefix, 0, sizeof(prefix));
+        memset(&my_frame, 0, sizeof(my_frame));
+        va_start(ap, key_buf);
+        vsnprintf(prefix, GF_DUMP_MAX_BUF_LEN, key_buf, ap); 
+        va_end(ap);
+
+        ret = TRY_LOCK(&call_frame->lock);
+        if (ret) {
+                gf_log("", GF_LOG_WARNING, "Unable to dump call frame"
+                " errno: %d", errno);
+                return;
+        }
+
+        memcpy(&my_frame, call_frame, sizeof(my_frame));
+        UNLOCK(&call_frame->lock);
+
+	gf_proc_dump_build_key(key, prefix,"ref_count");
+        gf_proc_dump_write(key, "%d", my_frame.ref_count);
+	gf_proc_dump_build_key(key, prefix,"translator");
+        gf_proc_dump_write(key, "%s", my_frame.this->name);
+	gf_proc_dump_build_key(key, prefix,"complete");
+        gf_proc_dump_write(key, "%d", my_frame.complete);
+        if (my_frame.parent) {
+                gf_proc_dump_build_key(key, prefix,"parent");
+                gf_proc_dump_write(key, "%s", my_frame.parent->this->name);
+        }
+}
+
+
+void
+gf_proc_dump_call_stack (call_stack_t *call_stack, const char *key_buf,...)
+{
+        char prefix[GF_DUMP_MAX_BUF_LEN];
+        va_list ap;
+        call_frame_t *trav;
+        int32_t cnt, i;
+        char key[GF_DUMP_MAX_BUF_LEN];
+
+        if (!call_stack)
+                return;
+
+        assert(key_buf);
+
+        cnt = call_frames_count(&call_stack->frames);
+
+        memset(prefix, 0, sizeof(prefix));
+        va_start(ap, key_buf);
+        vsnprintf(prefix, GF_DUMP_MAX_BUF_LEN, key_buf, ap); 
+        va_end(ap);
+
+	gf_proc_dump_build_key(key, prefix,"uid");
+        gf_proc_dump_write(key, "%d", call_stack->uid);
+	gf_proc_dump_build_key(key, prefix,"gid");
+        gf_proc_dump_write(key, "%d", call_stack->gid);
+	gf_proc_dump_build_key(key, prefix,"pid");
+        gf_proc_dump_write(key, "%d", call_stack->pid);
+	gf_proc_dump_build_key(key, prefix,"unique");
+        gf_proc_dump_write(key, "%Ld", call_stack->unique);
+
+	gf_proc_dump_build_key(key, prefix,"op");
+        if ((call_stack->type == GF_OP_TYPE_FOP_REQUEST) ||
+                (call_stack->type == GF_OP_TYPE_FOP_REPLY)) {
+                gf_proc_dump_write(key, "%s", gf_fop_list[call_stack->op]);
+        } else if ((call_stack->type == GF_OP_TYPE_MOP_REQUEST) ||
+                (call_stack->type == GF_OP_TYPE_MOP_REPLY)) {
+                gf_proc_dump_write(key, "%s", gf_mop_list[call_stack->op]);
+        } else if ((call_stack->type == GF_OP_TYPE_CBK_REQUEST) ||
+                (call_stack->type == GF_OP_TYPE_CBK_REPLY)) {
+                gf_proc_dump_write(key, "%s", gf_cbk_list[call_stack->op]);
+        }
+    
+	gf_proc_dump_build_key(key, prefix,"type");
+        gf_proc_dump_write(key, "%d", call_stack->type);
+	gf_proc_dump_build_key(key, prefix,"cnt");
+        gf_proc_dump_write(key, "%d", cnt);
+
+        trav = &call_stack->frames;
+
+        for (i = 1; i <= cnt; i++) {
+                if (trav) {
+                        gf_proc_dump_add_section("%s.frame.%d", prefix, i);
+                        gf_proc_dump_call_frame(trav, "%s.frame.%d", prefix, i);
+                        trav = trav->next; 
+                }
+        }
+}
+
+void
+gf_proc_dump_pending_frames (call_pool_t *call_pool)
+{
+		
+        call_stack_t     *trav = NULL;
+        int              i = 1;
+        int              ret = -1;
+
+        if (!call_pool)
+                return;
+
+        ret = TRY_LOCK (&(call_pool->lock));
+        if (ret) {
+                gf_log("", GF_LOG_WARNING, "Unable to dump call pool"
+                " errno: %d", errno);
+                return;
+        }
+
+        
+        gf_proc_dump_add_section("global.callpool");
+        gf_proc_dump_write("global.callpool","%p", call_pool);
+        gf_proc_dump_write("global.callpool.cnt","%d", call_pool->cnt);
+
+
+        list_for_each_entry (trav, &call_pool->all_frames, all_frames) {
+                gf_proc_dump_add_section("global.callpool.stack.%d",i);
+                gf_proc_dump_call_stack(trav, "global.callpool.stack.%d", i);
+                i++;
+        }
+	UNLOCK (&(call_pool->lock));
+}
+
diff --git a/libglusterfs/src/stack.h b/libglusterfs/src/stack.h
index e7c1cbd15..942972556 100644
--- a/libglusterfs/src/stack.h
+++ b/libglusterfs/src/stack.h
@@ -1,4 +1,4 @@
-/*
+/* 
   Copyright (c) 2006-2009 Z RESEARCH, Inc. <http://www.zresearch.com>
   This file is part of GlusterFS.
 
@@ -74,6 +74,7 @@ struct _call_frame_t {
 	int32_t       ref_count;
 	gf_lock_t     lock;
 	void         *cookie;      /* unique cookie */
+	gf_boolean_t  complete;
 };
 
 struct _call_stack_t {
@@ -208,6 +209,7 @@ STACK_DESTROY (call_stack_t *stack)
 		_parent->ref_count--;					\
                 old_THIS = THIS;                                        \
                 THIS = _parent->this;                                   \
+                frame->complete = _gf_true;                             \
 		fn (_parent, frame->cookie, _parent->this, params);	\
                 THIS = old_THIS;                                        \
 	} while (0)
@@ -281,5 +283,7 @@ create_frame (xlator_t *xl, call_pool_t *pool)
 	return &stack->frames;
 }
 
+void
+gf_proc_dump_pending_frames(call_pool_t *call_pool);
 
 #endif /* _STACK_H */
diff --git a/libglusterfs/src/statedump.c b/libglusterfs/src/statedump.c
new file mode 100644
index 000000000..6839c28f6
--- /dev/null
+++ b/libglusterfs/src/statedump.c
@@ -0,0 +1,213 @@
+/*
+  Copyright (c) 2009 Z RESEARCH, Inc. <http://www.zresearch.com>
+  This file is part of GlusterFS.
+
+  GlusterFS is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published
+  by the Free Software Foundation; either version 3 of the License,
+  or (at your option) any later version.
+
+  GlusterFS is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see
+  <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdarg.h>
+#include <malloc.h>
+#include "glusterfs.h"
+#include "logging.h"
+#include "iobuf.h"
+#include "statedump.h"
+#include "stack.h"
+
+
+static pthread_mutex_t  gf_proc_dump_mutex;
+static int gf_dump_fd = -1;
+
+static void 
+gf_proc_dump_lock (void)
+{
+	pthread_mutex_lock(&gf_proc_dump_mutex);
+}
+
+static void 
+gf_proc_dump_unlock (void)
+{
+	pthread_mutex_unlock(&gf_proc_dump_mutex);
+} 
+
+static int
+gf_proc_dump_open (void)
+{
+        char path[256];
+        int  dump_fd = -1;
+
+        memset(path, 0, sizeof(path));
+        snprintf(path, sizeof(path), "%s.%d",GF_DUMP_LOGFILE_ROOT, getpid());
+
+        dump_fd = open(path, O_CREAT|O_RDWR|O_TRUNC|O_APPEND, 0600);
+        if (dump_fd < 0) {
+                gf_log("", GF_LOG_ERROR, "Unable to open file: %s"
+                " errno: %d", path, errno);
+                return -1;
+        }
+
+	gf_dump_fd = dump_fd;
+        return 0;
+}
+
+static void
+gf_proc_dump_close (void)
+{
+        close(gf_dump_fd);
+        gf_dump_fd = -1;
+}
+
+void
+gf_proc_dump_add_section (char *key, ...) 
+{
+		
+        char buf[GF_DUMP_MAX_BUF_LEN];
+        va_list ap;
+        int     ret;
+
+	assert(key);
+                
+        memset(buf, 0, sizeof(buf));
+        snprintf(buf, GF_DUMP_MAX_BUF_LEN, "\n[");
+        va_start(ap, key);
+        vsnprintf(buf + strlen(buf), 
+                        GF_DUMP_MAX_BUF_LEN - strlen(buf), key, ap);
+        va_end(ap);
+        snprintf(buf + strlen(buf),
+                        GF_DUMP_MAX_BUF_LEN - strlen(buf),  "]\n");
+        ret = write(gf_dump_fd, buf, strlen(buf));
+}
+
+void
+gf_proc_dump_write (char *key, char *value,...) 
+{ 
+    
+        char buf[GF_DUMP_MAX_BUF_LEN];
+        int  offset = 0;
+	va_list      ap;
+        int          ret;
+    
+        offset = strlen(key);
+                
+        memset(buf, 0, GF_DUMP_MAX_BUF_LEN);
+        snprintf(buf, GF_DUMP_MAX_BUF_LEN, "%s",key);
+        snprintf(buf + offset, GF_DUMP_MAX_BUF_LEN - offset, "=");
+        offset += 1;
+        va_start(ap, value);
+        vsnprintf(buf + offset, GF_DUMP_MAX_BUF_LEN - offset, value, ap); 
+        va_end(ap);
+
+        offset = strlen(buf);
+        snprintf(buf + offset, GF_DUMP_MAX_BUF_LEN - offset, "\n");
+        ret = write(gf_dump_fd, buf, strlen(buf));
+}
+
+
+/* Currently this dumps only mallinfo. More can be built on here */
+void
+gf_proc_dump_mem_info ()
+{
+#ifdef HAVE_MALLOC_STATS
+        struct mallinfo info;
+
+        memset(&info, 0, sizeof(struct mallinfo));
+        info = mallinfo();
+
+        gf_proc_dump_add_section("mallinfo");
+        gf_proc_dump_write("mallinfo_arena", "%d", info.arena);
+        gf_proc_dump_write("mallinfo_ordblks", "%d", info.ordblks);
+        gf_proc_dump_write("mallinfo_smblks","%d", info.smblks);
+        gf_proc_dump_write("mallinfo_hblks","%d", info.hblks);
+        gf_proc_dump_write("mallinfo_hblkhd", "%d", info.hblkhd);
+        gf_proc_dump_write("mallinfo_usmblks","%d", info.usmblks);
+        gf_proc_dump_write("mallinfo_fsmblks","%d", info.fsmblks);
+        gf_proc_dump_write("mallinfo_uordblks","%d", info.uordblks);
+        gf_proc_dump_write("mallinfo_fordblks", "%d", info.fordblks);
+        gf_proc_dump_write("mallinfo_keepcost", "%d", info.keepcost);
+#endif
+
+}
+
+
+void
+gf_proc_dump_xlator_info (xlator_t *this_xl)
+{
+
+        if (!this_xl)
+                return;
+
+        while (this_xl) {
+                if (!this_xl->dumpops) {
+                        this_xl = this_xl->next;
+                        continue;
+                }
+                if (this_xl->dumpops->priv)
+                        this_xl->dumpops->priv(this_xl);
+                if (this_xl->dumpops->inode)
+                        this_xl->dumpops->inode(this_xl);
+                if (this_xl->dumpops->fd)
+                        this_xl->dumpops->fd(this_xl);
+                this_xl = this_xl->next;
+        }
+
+        return;
+}
+
+
+void
+gf_proc_dump_info (int signum)
+{
+        int               ret = -1;
+        glusterfs_ctx_t   *ctx = NULL;
+    
+        gf_proc_dump_lock();
+        ret = gf_proc_dump_open();
+        if (ret < 0) 
+                goto out;
+        gf_proc_dump_mem_info();
+	ctx = get_global_ctx_ptr();
+        if (ctx) {
+                iobuf_stats_dump(ctx->iobuf_pool);
+                gf_proc_dump_pending_frames(ctx->pool);
+                gf_proc_dump_xlator_info(ctx->graph);
+        }
+        
+        gf_proc_dump_close();
+out:
+        gf_proc_dump_unlock();
+
+        return;
+}
+
+void 
+gf_proc_dump_fini (void)
+{
+	pthread_mutex_destroy(&gf_proc_dump_mutex);
+}
+
+
+void
+gf_proc_dump_init ()
+{
+	pthread_mutex_init(&gf_proc_dump_mutex, NULL);
+
+	return;
+}
+
+void
+gf_proc_dump_cleanup (void)
+{
+	pthread_mutex_destroy(&gf_proc_dump_mutex);
+}
+
diff --git a/libglusterfs/src/statedump.h b/libglusterfs/src/statedump.h
new file mode 100644
index 000000000..9ac50ec0c
--- /dev/null
+++ b/libglusterfs/src/statedump.h
@@ -0,0 +1,78 @@
+/*
+  Copyright (c) 2009 Z RESEARCH, Inc. <http://www.zresearch.com>
+  This file is part of GlusterFS.
+
+  GlusterFS is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published
+  by the Free Software Foundation; either version 3 of the License,
+  or (at your option) any later version.
+
+  GlusterFS is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see
+  <http://www.gnu.org/licenses/>.
+*/
+
+
+#ifndef STATEDUMP_H
+#define STATEDUMP_H   
+
+#include <stdarg.h>
+#include "inode.h"
+
+#define GF_DUMP_MAX_BUF_LEN 4096
+
+#define GF_DUMP_LOGFILE_ROOT "/tmp/glusterdump"
+#define GF_DUMP_LOGFILE_ROOT_LEN 256
+
+static inline
+void _gf_proc_dump_build_key (char *key, const char *prefix, char *fmt,...)
+{
+        char buf[GF_DUMP_MAX_BUF_LEN];
+        va_list ap;
+
+        memset(buf, 0, sizeof(buf));
+        va_start(ap, fmt);
+        vsnprintf(buf, GF_DUMP_MAX_BUF_LEN, fmt, ap);
+        va_end(ap);
+        snprintf(key, GF_DUMP_MAX_BUF_LEN, "%s.%s", prefix, buf);  
+}
+
+#define gf_proc_dump_build_key(key, key_prefix, fmt...) \
+{\
+        _gf_proc_dump_build_key(key, key_prefix, ##fmt);\
+}
+
+typedef void (*inode_priv_dump_fn) (inode_t *);
+
+void
+gf_proc_dump_init();
+
+void 
+gf_proc_dump_fini(void);
+
+void
+gf_proc_dump_cleanup(void);
+
+void
+gf_proc_dump_info(int signum);
+
+void
+gf_proc_dump_add_section(char *key,...);
+
+void
+gf_proc_dump_write(char *key, char *value,...);
+
+void
+inode_table_dump(inode_table_t *itable, char *prefix, inode_priv_dump_fn fn);
+
+void
+fdtable_dump(fdtable_t *fdtable, char *prefix);
+
+void
+inode_dump(inode_t *inode, char *prefix, inode_priv_dump_fn fn);
+#endif /* STATEDUMP_H */
diff --git a/libglusterfs/src/xlator.c b/libglusterfs/src/xlator.c
index a3f8ea8fc..def1ad1df 100644
--- a/libglusterfs/src/xlator.c
+++ b/libglusterfs/src/xlator.c
@@ -740,6 +740,11 @@ xlator_set_type (xlator_t *xl,
 			"dlsym(notify) on %s -- neglecting", dlerror ());
 	}
 
+	if (!(xl->dumpops = dlsym (handle, "dumpops"))) {
+		gf_log ("xlator", GF_LOG_DEBUG,
+			"dlsym(dumpops) on %s -- neglecting", dlerror ());
+	}
+
 	INIT_LIST_HEAD (&xl->volume_options);
 
 	vol_opt = CALLOC (1, sizeof (volume_opt_list_t));
diff --git a/libglusterfs/src/xlator.h b/libglusterfs/src/xlator.h
index e8fc9d250..2e815af91 100644
--- a/libglusterfs/src/xlator.h
+++ b/libglusterfs/src/xlator.h
@@ -806,6 +806,19 @@ struct xlator_cbks {
 	cbk_release_t   releasedir;
 };
 
+typedef int32_t (*dumpop_priv_t) (xlator_t *this);
+
+typedef int32_t (*dumpop_inode_t) (xlator_t *this);
+
+typedef int32_t (*dumpop_fd_t)  (xlator_t   *this);
+
+                              
+struct xlator_dumpops {
+	dumpop_priv_t            priv;
+	dumpop_inode_t           inode;
+        dumpop_fd_t              fd;
+};
+
 typedef struct xlator_list {
 	xlator_t           *xlator;
 	struct xlator_list *next;
@@ -859,10 +872,11 @@ struct _xlator {
 	dict_t        *options;
 	
 	/* Set after doing dlopen() */
-	struct xlator_fops *fops;
-	struct xlator_mops *mops;
-	struct xlator_cbks *cbks;
-	struct list_head   volume_options;  /* list of volume_option_t */
+	struct xlator_fops    *fops;
+	struct xlator_mops    *mops;
+	struct xlator_cbks    *cbks;
+	struct xlator_dumpops *dumpops;
+	struct list_head      volume_options;  /* list of volume_option_t */
 
 	void              (*fini) (xlator_t *this);
 	int32_t           (*init) (xlator_t *this);