Merge branch 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/mfasheh/ocfs2

* 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/mfasheh/ocfs2: (22 commits)
  configfs: Zero terminate data in configfs attribute writes.
  [PATCH] ocfs2 heartbeat: clean up bio submission code
  ocfs2: introduce sc->sc_send_lock to protect outbound outbound messages
  [PATCH] ocfs2: drop INET from Kconfig, not needed
  ocfs2_dlm: Add timeout to dlm join domain
  ocfs2_dlm: Silence some messages during join domain
  ocfs2_dlm: disallow a domain join if node maps mismatch
  ocfs2_dlm: Ensure correct ordering of set/clear refmap bit on lockres
  ocfs2: Binds listener to the configured ip address
  ocfs2_dlm: Calling post handler function in assert master handler
  ocfs2: Added post handler callable function in o2net message handler
  ocfs2_dlm: Cookies in locks not being printed correctly in error messages
  ocfs2_dlm: Silence a failed convert
  ocfs2_dlm: wake up sleepers on the lockres waitqueue
  ocfs2_dlm: Dlm dispatch was stopping too early
  ocfs2_dlm: Drop inflight refmap even if no locks found on the lockres
  ocfs2_dlm: Flush dlm workqueue before starting to migrate
  ocfs2_dlm: Fix migrate lockres handler queue scanning
  ocfs2_dlm: Make dlmunlock() wait for migration to complete
  ocfs2_dlm: Fixes race between migrate and dirty
  ...

fs/Kconfig

@@ -426,7 +426,6 @@ config OCFS2_FS
 	select CONFIGFS_FS
 	select JBD
 	select CRC32
-	select INET
 	help
 	  OCFS2 is a general purpose extent based shared disk cluster file
 	  system with many similarities to ext3. It supports 64 bit inode

fs/configfs/file.c

@@ -162,14 +162,17 @@ fill_write_buffer(struct configfs_buffer * buffer, const char __user * buf, size
 	int error;
 
 	if (!buffer->page)
-		buffer->page = (char *)get_zeroed_page(GFP_KERNEL);
+		buffer->page = (char *)__get_free_pages(GFP_KERNEL, 0);
 	if (!buffer->page)
 		return -ENOMEM;
 
-	if (count > PAGE_SIZE)
-		count = PAGE_SIZE;
+	if (count >= PAGE_SIZE)
+		count = PAGE_SIZE - 1;
 	error = copy_from_user(buffer->page,buf,count);
 	buffer->needs_read_fill = 1;
+	/* if buf is assumed to contain a string, terminate it by \0,
+	 * so e.g. sscanf() can scan the string easily */
+	buffer->page[count] = 0;
 	return error ? -EFAULT : count;
 }
 

fs/ocfs2/cluster/heartbeat.c

@@ -184,10 +184,9 @@ static void o2hb_disarm_write_timeout(struct o2hb_region *reg)
 	flush_scheduled_work();
 }
 
-static inline void o2hb_bio_wait_init(struct o2hb_bio_wait_ctxt *wc,
-				      unsigned int num_ios)
+static inline void o2hb_bio_wait_init(struct o2hb_bio_wait_ctxt *wc)
 {
-	atomic_set(&wc->wc_num_reqs, num_ios);
+	atomic_set(&wc->wc_num_reqs, 1);
 	init_completion(&wc->wc_io_complete);
 	wc->wc_error = 0;
 }
@@ -212,6 +211,7 @@ static void o2hb_wait_on_io(struct o2hb_region *reg,
 	struct address_space *mapping = reg->hr_bdev->bd_inode->i_mapping;
 
 	blk_run_address_space(mapping);
+	o2hb_bio_wait_dec(wc, 1);
 
 	wait_for_completion(&wc->wc_io_complete);
 }
@@ -231,6 +231,7 @@ static int o2hb_bio_end_io(struct bio *bio,
 		return 1;
 
 	o2hb_bio_wait_dec(wc, 1);
+	bio_put(bio);
 	return 0;
 }
 
@@ -238,23 +239,22 @@ static int o2hb_bio_end_io(struct bio *bio,
  * start_slot. */
 static struct bio *o2hb_setup_one_bio(struct o2hb_region *reg,
 				      struct o2hb_bio_wait_ctxt *wc,
-				      unsigned int start_slot,
-				      unsigned int num_slots)
+				      unsigned int *current_slot,
+				      unsigned int max_slots)
 {
-	int i, nr_vecs, len, first_page, last_page;
+	int len, current_page;
 	unsigned int vec_len, vec_start;
 	unsigned int bits = reg->hr_block_bits;
 	unsigned int spp = reg->hr_slots_per_page;
+	unsigned int cs = *current_slot;
 	struct bio *bio;
 	struct page *page;
 
-	nr_vecs = (num_slots + spp - 1) / spp;
-
 	/* Testing has shown this allocation to take long enough under
 	 * GFP_KERNEL that the local node can get fenced. It would be
 	 * nicest if we could pre-allocate these bios and avoid this
 	 * all together. */
-	bio = bio_alloc(GFP_ATOMIC, nr_vecs);
+	bio = bio_alloc(GFP_ATOMIC, 16);
 	if (!bio) {
 		mlog(ML_ERROR, "Could not alloc slots BIO!\n");
 		bio = ERR_PTR(-ENOMEM);
@@ -262,137 +262,53 @@ static struct bio *o2hb_setup_one_bio(struct o2hb_region *reg,
 	}
 
 	/* Must put everything in 512 byte sectors for the bio... */
-	bio->bi_sector = (reg->hr_start_block + start_slot) << (bits - 9);
+	bio->bi_sector = (reg->hr_start_block + cs) << (bits - 9);
 	bio->bi_bdev = reg->hr_bdev;
 	bio->bi_private = wc;
 	bio->bi_end_io = o2hb_bio_end_io;
 
-	first_page = start_slot / spp;
-	last_page = first_page + nr_vecs;
-	vec_start = (start_slot << bits) % PAGE_CACHE_SIZE;
-	for(i = first_page; i < last_page; i++) {
-		page = reg->hr_slot_data[i];
+	vec_start = (cs << bits) % PAGE_CACHE_SIZE;
+	while(cs < max_slots) {
+		current_page = cs / spp;
+		page = reg->hr_slot_data[current_page];
 
-		vec_len = PAGE_CACHE_SIZE;
-		/* last page might be short */
-		if (((i + 1) * spp) > (start_slot + num_slots))
-			vec_len = ((num_slots + start_slot) % spp) << bits;
-		vec_len -=  vec_start;
+		vec_len = min(PAGE_CACHE_SIZE,
+			      (max_slots-cs) * (PAGE_CACHE_SIZE/spp) );
 
 		mlog(ML_HB_BIO, "page %d, vec_len = %u, vec_start = %u\n",
-		     i, vec_len, vec_start);
+		     current_page, vec_len, vec_start);
 
 		len = bio_add_page(bio, page, vec_len, vec_start);
-		if (len != vec_len) {
-			bio_put(bio);
-			bio = ERR_PTR(-EIO);
-
-			mlog(ML_ERROR, "Error adding page to bio i = %d, "
-			     "vec_len = %u, len = %d\n, start = %u\n",
-			     i, vec_len, len, vec_start);
-			goto bail;
-		}
+		if (len != vec_len) break;
 
+		cs += vec_len / (PAGE_CACHE_SIZE/spp);
 		vec_start = 0;
 	}
 
 bail:
+	*current_slot = cs;
 	return bio;
 }
 
-/*
- * Compute the maximum number of sectors the bdev can handle in one bio,
- * as a power of two.
- *
- * Stolen from oracleasm, thanks Joel!
- */
-static int compute_max_sectors(struct block_device *bdev)
-{
-	int max_pages, max_sectors, pow_two_sectors;
-
-	struct request_queue *q;
-
-	q = bdev_get_queue(bdev);
-	max_pages = q->max_sectors >> (PAGE_SHIFT - 9);
-	if (max_pages > BIO_MAX_PAGES)
-		max_pages = BIO_MAX_PAGES;
-	if (max_pages > q->max_phys_segments)
-		max_pages = q->max_phys_segments;
-	if (max_pages > q->max_hw_segments)
-		max_pages = q->max_hw_segments;
-	max_pages--; /* Handle I/Os that straddle a page */
-
-	if (max_pages) {
-		max_sectors = max_pages << (PAGE_SHIFT - 9);
-	} else {
-		/* If BIO contains 1 or less than 1 page. */
-		max_sectors = q->max_sectors;
-	}
-	/* Why is fls() 1-based???? */
-	pow_two_sectors = 1 << (fls(max_sectors) - 1);
-
-	return pow_two_sectors;
-}
-
-static inline void o2hb_compute_request_limits(struct o2hb_region *reg,
-					       unsigned int num_slots,
-					       unsigned int *num_bios,
-					       unsigned int *slots_per_bio)
-{
-	unsigned int max_sectors, io_sectors;
-
-	max_sectors = compute_max_sectors(reg->hr_bdev);
-
-	io_sectors = num_slots << (reg->hr_block_bits - 9);
-
-	*num_bios = (io_sectors + max_sectors - 1) / max_sectors;
-	*slots_per_bio = max_sectors >> (reg->hr_block_bits - 9);
-
-	mlog(ML_HB_BIO, "My io size is %u sectors for %u slots. This "
-	     "device can handle %u sectors of I/O\n", io_sectors, num_slots,
-	     max_sectors);
-	mlog(ML_HB_BIO, "Will need %u bios holding %u slots each\n",
-	     *num_bios, *slots_per_bio);
-}
-
 static int o2hb_read_slots(struct o2hb_region *reg,
 			   unsigned int max_slots)
 {
-	unsigned int num_bios, slots_per_bio, start_slot, num_slots;
-	int i, status;
+	unsigned int current_slot=0;
+	int status;
 	struct o2hb_bio_wait_ctxt wc;
-	struct bio **bios;
 	struct bio *bio;
 
-	o2hb_compute_request_limits(reg, max_slots, &num_bios, &slots_per_bio);
-
-	bios = kcalloc(num_bios, sizeof(struct bio *), GFP_KERNEL);
-	if (!bios) {
-		status = -ENOMEM;
-		mlog_errno(status);
-		return status;
-	}
-
-	o2hb_bio_wait_init(&wc, num_bios);
-
-	num_slots = slots_per_bio;
-	for(i = 0; i < num_bios; i++) {
-		start_slot = i * slots_per_bio;
+	o2hb_bio_wait_init(&wc);
 
-		/* adjust num_slots at last bio */
-		if (max_slots < (start_slot + num_slots))
-			num_slots = max_slots - start_slot;
-
-		bio = o2hb_setup_one_bio(reg, &wc, start_slot, num_slots);
+	while(current_slot < max_slots) {
+		bio = o2hb_setup_one_bio(reg, &wc, &current_slot, max_slots);
 		if (IS_ERR(bio)) {
-			o2hb_bio_wait_dec(&wc, num_bios - i);
-
 			status = PTR_ERR(bio);
 			mlog_errno(status);
 			goto bail_and_wait;
 		}
-		bios[i] = bio;
 
+		atomic_inc(&wc.wc_num_reqs);
 		submit_bio(READ, bio);
 	}
 
@@ -403,38 +319,30 @@ static int o2hb_read_slots(struct o2hb_region *reg,
 	if (wc.wc_error && !status)
 		status = wc.wc_error;
 
-	if (bios) {
-		for(i = 0; i < num_bios; i++)
-			if (bios[i])
-				bio_put(bios[i]);
-		kfree(bios);
-	}
-
 	return status;
 }
 
 static int o2hb_issue_node_write(struct o2hb_region *reg,
-				 struct bio **write_bio,
 				 struct o2hb_bio_wait_ctxt *write_wc)
 {
 	int status;
 	unsigned int slot;
 	struct bio *bio;
 
-	o2hb_bio_wait_init(write_wc, 1);
+	o2hb_bio_wait_init(write_wc);
 
 	slot = o2nm_this_node();
 
-	bio = o2hb_setup_one_bio(reg, write_wc, slot, 1);
+	bio = o2hb_setup_one_bio(reg, write_wc, &slot, slot+1);
 	if (IS_ERR(bio)) {
 		status = PTR_ERR(bio);
 		mlog_errno(status);
 		goto bail;
 	}
 
+	atomic_inc(&write_wc->wc_num_reqs);
 	submit_bio(WRITE, bio);
 
-	*write_bio = bio;
 	status = 0;
 bail:
 	return status;
@@ -826,7 +734,6 @@ static int o2hb_do_disk_heartbeat(struct o2hb_region *reg)
 {
 	int i, ret, highest_node, change = 0;
 	unsigned long configured_nodes[BITS_TO_LONGS(O2NM_MAX_NODES)];
-	struct bio *write_bio;
 	struct o2hb_bio_wait_ctxt write_wc;
 
 	ret = o2nm_configured_node_map(configured_nodes,
@@ -864,7 +771,7 @@ static int o2hb_do_disk_heartbeat(struct o2hb_region *reg)
 
 	/* And fire off the write. Note that we don't wait on this I/O
 	 * until later. */
-	ret = o2hb_issue_node_write(reg, &write_bio, &write_wc);
+	ret = o2hb_issue_node_write(reg, &write_wc);
 	if (ret < 0) {
 		mlog_errno(ret);
 		return ret;
@@ -882,7 +789,6 @@ static int o2hb_do_disk_heartbeat(struct o2hb_region *reg)
 	 * people we find in our steady state have seen us.
 	 */
 	o2hb_wait_on_io(reg, &write_wc);
-	bio_put(write_bio);
 	if (write_wc.wc_error) {
 		/* Do not re-arm the write timeout on I/O error - we
 		 * can't be sure that the new block ever made it to
@@ -943,7 +849,6 @@ static int o2hb_thread(void *data)
 {
 	int i, ret;
 	struct o2hb_region *reg = data;
-	struct bio *write_bio;
 	struct o2hb_bio_wait_ctxt write_wc;
 	struct timeval before_hb, after_hb;
 	unsigned int elapsed_msec;
@@ -993,10 +898,9 @@ static int o2hb_thread(void *data)
 	 *
 	 * XXX: Should we skip this on unclean_stop? */
 	o2hb_prepare_block(reg, 0);
-	ret = o2hb_issue_node_write(reg, &write_bio, &write_wc);
+	ret = o2hb_issue_node_write(reg, &write_wc);
 	if (ret == 0) {
 		o2hb_wait_on_io(reg, &write_wc);
-		bio_put(write_bio);
 	} else {
 		mlog_errno(ret);
 	}

fs/ocfs2/cluster/tcp.c

@@ -556,6 +556,8 @@ static void o2net_register_callbacks(struct sock *sk,
 	sk->sk_data_ready = o2net_data_ready;
 	sk->sk_state_change = o2net_state_change;
 
+	mutex_init(&sc->sc_send_lock);
+
 	write_unlock_bh(&sk->sk_callback_lock);
 }
 
@@ -688,6 +690,7 @@ static void o2net_handler_put(struct o2net_msg_handler *nmh)
  * be given to the handler if their payload is longer than the max. */
 int o2net_register_handler(u32 msg_type, u32 key, u32 max_len,
 			   o2net_msg_handler_func *func, void *data,
+			   o2net_post_msg_handler_func *post_func,
 			   struct list_head *unreg_list)
 {
 	struct o2net_msg_handler *nmh = NULL;
@@ -722,6 +725,7 @@ int o2net_register_handler(u32 msg_type, u32 key, u32 max_len,
 
 	nmh->nh_func = func;
 	nmh->nh_func_data = data;
+	nmh->nh_post_func = post_func;
 	nmh->nh_msg_type = msg_type;
 	nmh->nh_max_len = max_len;
 	nmh->nh_key = key;
@@ -856,10 +860,12 @@ static void o2net_sendpage(struct o2net_sock_container *sc,
 	ssize_t ret;
 
 
+	mutex_lock(&sc->sc_send_lock);
 	ret = sc->sc_sock->ops->sendpage(sc->sc_sock,
 					 virt_to_page(kmalloced_virt),
 					 (long)kmalloced_virt & ~PAGE_MASK,
 					 size, MSG_DONTWAIT);
+	mutex_unlock(&sc->sc_send_lock);
 	if (ret != size) {
 		mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT 
 		     " failed with %zd\n", size, SC_NODEF_ARGS(sc), ret);
@@ -974,8 +980,10 @@ int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec,
 
 	/* finally, convert the message header to network byte-order
 	 * and send */
+	mutex_lock(&sc->sc_send_lock);
 	ret = o2net_send_tcp_msg(sc->sc_sock, vec, veclen,
 				 sizeof(struct o2net_msg) + caller_bytes);
+	mutex_unlock(&sc->sc_send_lock);
 	msglog(msg, "sending returned %d\n", ret);
 	if (ret < 0) {
 		mlog(0, "error returned from o2net_send_tcp_msg=%d\n", ret);
@@ -1049,6 +1057,7 @@ static int o2net_process_message(struct o2net_sock_container *sc,
 	int ret = 0, handler_status;
 	enum  o2net_system_error syserr;
 	struct o2net_msg_handler *nmh = NULL;
+	void *ret_data = NULL;
 
 	msglog(hdr, "processing message\n");
 
@@ -1101,17 +1110,26 @@ static int o2net_process_message(struct o2net_sock_container *sc,
 	sc->sc_msg_type = be16_to_cpu(hdr->msg_type);
 	handler_status = (nmh->nh_func)(hdr, sizeof(struct o2net_msg) +
 					     be16_to_cpu(hdr->data_len),
-					nmh->nh_func_data);
+					nmh->nh_func_data, &ret_data);
 	do_gettimeofday(&sc->sc_tv_func_stop);
 
 out_respond:
 	/* this destroys the hdr, so don't use it after this */
+	mutex_lock(&sc->sc_send_lock);
 	ret = o2net_send_status_magic(sc->sc_sock, hdr, syserr,
 				      handler_status);
+	mutex_unlock(&sc->sc_send_lock);
 	hdr = NULL;
 	mlog(0, "sending handler status %d, syserr %d returned %d\n",
 	     handler_status, syserr, ret);
 
+	if (nmh) {
+		BUG_ON(ret_data != NULL && nmh->nh_post_func == NULL);
+		if (nmh->nh_post_func)
+			(nmh->nh_post_func)(handler_status, nmh->nh_func_data,
+					    ret_data);
+	}
+
 out:
 	if (nmh)
 		o2net_handler_put(nmh);
@@ -1795,13 +1813,13 @@ static void o2net_listen_data_ready(struct sock *sk, int bytes)
 	ready(sk, bytes);
 }
 
-static int o2net_open_listening_sock(__be16 port)
+static int o2net_open_listening_sock(__be32 addr, __be16 port)
 {
 	struct socket *sock = NULL;
 	int ret;
 	struct sockaddr_in sin = {
 		.sin_family = PF_INET,
-		.sin_addr = { .s_addr = (__force u32)htonl(INADDR_ANY) },
+		.sin_addr = { .s_addr = (__force u32)addr },
 		.sin_port = (__force u16)port,
 	};
 
@@ -1824,15 +1842,15 @@ static int o2net_open_listening_sock(__be16 port)
 	sock->sk->sk_reuse = 1;
 	ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin));
 	if (ret < 0) {
-		mlog(ML_ERROR, "unable to bind socket to port %d, ret=%d\n",
-		     ntohs(port), ret);
+		mlog(ML_ERROR, "unable to bind socket at %u.%u.%u.%u:%u, "
+		     "ret=%d\n", NIPQUAD(addr), ntohs(port), ret);
 		goto out;
 	}
 
 	ret = sock->ops->listen(sock, 64);
 	if (ret < 0) {
-		mlog(ML_ERROR, "unable to listen on port %d, ret=%d\n",
-		     ntohs(port), ret);
+		mlog(ML_ERROR, "unable to listen on %u.%u.%u.%u:%u, ret=%d\n",
+		     NIPQUAD(addr), ntohs(port), ret);
 	}
 
 out:
@@ -1865,7 +1883,8 @@ int o2net_start_listening(struct o2nm_node *node)
 		return -ENOMEM; /* ? */
 	}
 
-	ret = o2net_open_listening_sock(node->nd_ipv4_port);
+	ret = o2net_open_listening_sock(node->nd_ipv4_address,
+					node->nd_ipv4_port);
 	if (ret) {
 		destroy_workqueue(o2net_wq);
 		o2net_wq = NULL;

fs/ocfs2/cluster/tcp.h

@@ -50,7 +50,10 @@ struct o2net_msg
 	__u8  buf[0];
 };
 
-typedef int (o2net_msg_handler_func)(struct o2net_msg *msg, u32 len, void *data);
+typedef int (o2net_msg_handler_func)(struct o2net_msg *msg, u32 len, void *data,
+				     void **ret_data);
+typedef void (o2net_post_msg_handler_func)(int status, void *data,
+					   void *ret_data);
 
 #define O2NET_MAX_PAYLOAD_BYTES  (4096 - sizeof(struct o2net_msg))
 
@@ -99,6 +102,7 @@ int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *vec,
 
 int o2net_register_handler(u32 msg_type, u32 key, u32 max_len,
 			   o2net_msg_handler_func *func, void *data,
+			   o2net_post_msg_handler_func *post_func,
 			   struct list_head *unreg_list);
 void o2net_unregister_handler_list(struct list_head *list);
 

fs/ocfs2/cluster/tcp_internal.h

@@ -38,6 +38,12 @@
  * locking semantics of the file system using the protocol.  It should 
  * be somewhere else, I'm sure, but right now it isn't.
  *
+ * New in version 7:
+ * 	- DLM join domain includes the live nodemap
+ *
+ * New in version 6:
+ * 	- DLM lockres remote refcount fixes.
+ *
  * New in version 5:
  * 	- Network timeout checking protocol
  *
@@ -51,7 +57,7 @@
  * 	- full 64 bit i_size in the metadata lock lvbs
  * 	- introduction of "rw" lock and pushing meta/data locking down
  */
-#define O2NET_PROTOCOL_VERSION 5ULL
+#define O2NET_PROTOCOL_VERSION 7ULL
 struct o2net_handshake {
 	__be64	protocol_version;
 	__be64	connector_id;
@@ -149,6 +155,8 @@ struct o2net_sock_container {
 	struct timeval 		sc_tv_func_stop;
 	u32			sc_msg_key;
 	u16			sc_msg_type;
+
+	struct mutex		sc_send_lock;
 };
 
 struct o2net_msg_handler {
@@ -158,6 +166,8 @@ struct o2net_msg_handler {
 	u32			nh_key;
 	o2net_msg_handler_func	*nh_func;
 	o2net_msg_handler_func	*nh_func_data;
+	o2net_post_msg_handler_func
+				*nh_post_func;
 	struct kref		nh_kref;
 	struct list_head	nh_unregister_item;
 };

fs/ocfs2/dlm/dlmast.c

@@ -263,7 +263,8 @@ void dlm_do_local_bast(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
 
 
 
-int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data)
+int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data,
+			  void **ret_data)
 {
 	int ret;
 	unsigned int locklen;
@@ -311,8 +312,8 @@ int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data)
 	    past->type != DLM_BAST) {
 		mlog(ML_ERROR, "Unknown ast type! %d, cookie=%u:%llu"
 		     "name=%.*s\n", past->type, 
-		     dlm_get_lock_cookie_node(cookie),
-		     dlm_get_lock_cookie_seq(cookie),
+		     dlm_get_lock_cookie_node(be64_to_cpu(cookie)),
+		     dlm_get_lock_cookie_seq(be64_to_cpu(cookie)),
 		     locklen, name);
 		ret = DLM_IVLOCKID;
 		goto leave;
@@ -323,8 +324,8 @@ int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data)
 		mlog(0, "got %sast for unknown lockres! "
 		     "cookie=%u:%llu, name=%.*s, namelen=%u\n",
 		     past->type == DLM_AST ? "" : "b",
-		     dlm_get_lock_cookie_node(cookie),
-		     dlm_get_lock_cookie_seq(cookie),
+		     dlm_get_lock_cookie_node(be64_to_cpu(cookie)),
+		     dlm_get_lock_cookie_seq(be64_to_cpu(cookie)),
 		     locklen, name, locklen);
 		ret = DLM_IVLOCKID;
 		goto leave;
@@ -369,7 +370,8 @@ int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data)
 
 	mlog(0, "got %sast for unknown lock!  cookie=%u:%llu, "
 	     "name=%.*s, namelen=%u\n", past->type == DLM_AST ? "" : "b", 
-	     dlm_get_lock_cookie_node(cookie), dlm_get_lock_cookie_seq(cookie),
+	     dlm_get_lock_cookie_node(be64_to_cpu(cookie)),
+	     dlm_get_lock_cookie_seq(be64_to_cpu(cookie)),
 	     locklen, name, locklen);
 
 	ret = DLM_NORMAL;

fs/ocfs2/dlm/dlmcommon.h

@@ -180,6 +180,11 @@ struct dlm_assert_master_priv
 	unsigned ignore_higher:1;
 };
 
+struct dlm_deref_lockres_priv
+{
+	struct dlm_lock_resource *deref_res;
+	u8 deref_node;
+};
 
 struct dlm_work_item
 {
@@ -191,6 +196,7 @@ struct dlm_work_item
 		struct dlm_request_all_locks_priv ral;
 		struct dlm_mig_lockres_priv ml;
 		struct dlm_assert_master_priv am;
+		struct dlm_deref_lockres_priv dl;
 	} u;
 };
 
@@ -222,6 +228,9 @@ static inline void __dlm_set_joining_node(struct dlm_ctxt *dlm,
 #define DLM_LOCK_RES_DIRTY                0x00000008
 #define DLM_LOCK_RES_IN_PROGRESS          0x00000010
 #define DLM_LOCK_RES_MIGRATING            0x00000020
+#define DLM_LOCK_RES_DROPPING_REF         0x00000040
+#define DLM_LOCK_RES_BLOCK_DIRTY          0x00001000
+#define DLM_LOCK_RES_SETREF_INPROG        0x00002000
 
 /* max milliseconds to wait to sync up a network failure with a node death */
 #define DLM_NODE_DEATH_WAIT_MAX (5 * 1000)
@@ -265,6 +274,8 @@ struct dlm_lock_resource
 	u8  owner;              //node which owns the lock resource, or unknown
 	u16 state;
 	char lvb[DLM_LVB_LEN];
+	unsigned int inflight_locks;
+	unsigned long refmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
 };
 
 struct dlm_migratable_lock
@@ -367,7 +378,7 @@ enum {
 	DLM_CONVERT_LOCK_MSG,	 /* 504 */
 	DLM_PROXY_AST_MSG,	 /* 505 */
 	DLM_UNLOCK_LOCK_MSG,	 /* 506 */
-	DLM_UNUSED_MSG2,	 /* 507 */
+	DLM_DEREF_LOCKRES_MSG,	 /* 507 */
 	DLM_MIGRATE_REQUEST_MSG, /* 508 */
 	DLM_MIG_LOCKRES_MSG, 	 /* 509 */
 	DLM_QUERY_JOIN_MSG,	 /* 510 */
@@ -417,6 +428,9 @@ struct dlm_master_request
 	u8 name[O2NM_MAX_NAME_LEN];
 };
 
+#define DLM_ASSERT_RESPONSE_REASSERT       0x00000001
+#define DLM_ASSERT_RESPONSE_MASTERY_REF    0x00000002
+
 #define DLM_ASSERT_MASTER_MLE_CLEANUP      0x00000001
 #define DLM_ASSERT_MASTER_REQUERY          0x00000002
 #define DLM_ASSERT_MASTER_FINISH_MIGRATION 0x00000004
@@ -430,6 +444,8 @@ struct dlm_assert_master
 	u8 name[O2NM_MAX_NAME_LEN];
 };
 
+#define DLM_MIGRATE_RESPONSE_MASTERY_REF   0x00000001
+
 struct dlm_migrate_request
 {
 	u8 master;
@@ -609,12 +625,16 @@ struct dlm_begin_reco
 };
 
 
+#define BITS_PER_BYTE 8
+#define BITS_TO_BYTES(bits) (((bits)+BITS_PER_BYTE-1)/BITS_PER_BYTE)
+
 struct dlm_query_join_request
 {
 	u8 node_idx;
 	u8 pad1[2];
 	u8 name_len;
 	u8 domain[O2NM_MAX_NAME_LEN];
+	u8 node_map[BITS_TO_BYTES(O2NM_MAX_NODES)];
 };
 
 struct dlm_assert_joined
@@ -648,6 +668,16 @@ struct dlm_finalize_reco
 	__be32 pad2;
 };
 
+struct dlm_deref_lockres
+{
+	u32 pad1;
+	u16 pad2;
+	u8 node_idx;
+	u8 namelen;
+
+	u8 name[O2NM_MAX_NAME_LEN];
+};
+
 static inline enum dlm_status
 __dlm_lockres_state_to_status(struct dlm_lock_resource *res)
 {
@@ -688,16 +718,20 @@ void dlm_lock_put(struct dlm_lock *lock);
 void dlm_lock_attach_lockres(struct dlm_lock *lock,
 			     struct dlm_lock_resource *res);
 
-int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data);
-int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data);
-int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data);
+int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data,
+			    void **ret_data);
+int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data,
+			     void **ret_data);
+int dlm_proxy_ast_handler(struct o2net_msg *msg, u32 len, void *data,
+			  void **ret_data);
 
 void dlm_revert_pending_convert(struct dlm_lock_resource *res,
 				struct dlm_lock *lock);
 void dlm_revert_pending_lock(struct dlm_lock_resource *res,
 			     struct dlm_lock *lock);
 
-int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data);
+int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data,
+			    void **ret_data);
 void dlm_commit_pending_cancel(struct dlm_lock_resource *res,
 			       struct dlm_lock *lock);
 void dlm_commit_pending_unlock(struct dlm_lock_resource *res,
@@ -721,8 +755,6 @@ void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
 			      struct dlm_lock_resource *res);
 void dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
 			    struct dlm_lock_resource *res);
-void dlm_purge_lockres(struct dlm_ctxt *dlm,
-		       struct dlm_lock_resource *lockres);
 static inline void dlm_lockres_get(struct dlm_lock_resource *res)
 {
 	/* This is called on every lookup, so it might be worth
@@ -733,6 +765,10 @@ void dlm_lockres_put(struct dlm_lock_resource *res);
 void __dlm_unhash_lockres(struct dlm_lock_resource *res);
 void __dlm_insert_lockres(struct dlm_ctxt *dlm,
 			  struct dlm_lock_resource *res);
+struct dlm_lock_resource * __dlm_lookup_lockres_full(struct dlm_ctxt *dlm,
+						     const char *name,
+						     unsigned int len,
+						     unsigned int hash);
 struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
 						const char *name,
 						unsigned int len,
@@ -753,6 +789,47 @@ struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm,
 					  const char *name,
 					  unsigned int namelen);
 
+#define dlm_lockres_set_refmap_bit(bit,res)  \
+	__dlm_lockres_set_refmap_bit(bit,res,__FILE__,__LINE__)
+#define dlm_lockres_clear_refmap_bit(bit,res)  \
+	__dlm_lockres_clear_refmap_bit(bit,res,__FILE__,__LINE__)
+
+static inline void __dlm_lockres_set_refmap_bit(int bit,
+						struct dlm_lock_resource *res,
+						const char *file,
+						int line)
+{
+	//printk("%s:%d:%.*s: setting bit %d\n", file, line,
+	//     res->lockname.len, res->lockname.name, bit);
+	set_bit(bit, res->refmap);
+}
+
+static inline void __dlm_lockres_clear_refmap_bit(int bit,
+						  struct dlm_lock_resource *res,
+						  const char *file,
+						  int line)
+{
+	//printk("%s:%d:%.*s: clearing bit %d\n", file, line,
+	//     res->lockname.len, res->lockname.name, bit);
+	clear_bit(bit, res->refmap);
+}
+
+void __dlm_lockres_drop_inflight_ref(struct dlm_ctxt *dlm,
+				   struct dlm_lock_resource *res,
+				   const char *file,
+				   int line);
+void __dlm_lockres_grab_inflight_ref(struct dlm_ctxt *dlm,
+				   struct dlm_lock_resource *res,
+				   int new_lockres,
+				   const char *file,
+				   int line);
+#define dlm_lockres_drop_inflight_ref(d,r)  \
+	__dlm_lockres_drop_inflight_ref(d,r,__FILE__,__LINE__)
+#define dlm_lockres_grab_inflight_ref(d,r)  \
+	__dlm_lockres_grab_inflight_ref(d,r,0,__FILE__,__LINE__)
+#define dlm_lockres_grab_inflight_ref_new(d,r)  \
+	__dlm_lockres_grab_inflight_ref(d,r,1,__FILE__,__LINE__)
+
 void dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
 void dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
 void dlm_do_local_ast(struct dlm_ctxt *dlm,
@@ -801,10 +878,7 @@ int dlm_heartbeat_init(struct dlm_ctxt *dlm);
 void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data);
 void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data);
 
-int dlm_lockres_is_dirty(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
-int dlm_migrate_lockres(struct dlm_ctxt *dlm,
-			struct dlm_lock_resource *res,
-			u8 target);
+int dlm_empty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res);
 int dlm_finish_migration(struct dlm_ctxt *dlm,
 			 struct dlm_lock_resource *res,
 			 u8 old_master);
@@ -812,15 +886,27 @@ void dlm_lockres_release_ast(struct dlm_ctxt *dlm,
 			     struct dlm_lock_resource *res);
 void __dlm_lockres_reserve_ast(struct dlm_lock_resource *res);
 
-int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data);
-int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data);
-int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data);
-int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data);
-int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data);
-int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data);
-int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data);
-int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data);
-int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data);
+int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data,
+			       void **ret_data);
+int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data,
+			      void **ret_data);
+void dlm_assert_master_post_handler(int status, void *data, void *ret_data);
+int dlm_deref_lockres_handler(struct o2net_msg *msg, u32 len, void *data,
+			      void **ret_data);
+int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data,
+				void **ret_data);
+int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data,
+			    void **ret_data);
+int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data,
+			       void **ret_data);
+int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data,
+				  void **ret_data);
+int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data,
+			       void **ret_data);
+int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data,
+			   void **ret_data);
+int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data,
+			      void **ret_data);
 int dlm_do_master_requery(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
 			  u8 nodenum, u8 *real_master);
 
@@ -856,10 +942,12 @@ static inline void __dlm_wait_on_lockres(struct dlm_lock_resource *res)
 int dlm_init_mle_cache(void);
 void dlm_destroy_mle_cache(void);
 void dlm_hb_event_notify_attached(struct dlm_ctxt *dlm, int idx, int node_up);
+int dlm_drop_lockres_ref(struct dlm_ctxt *dlm,
+			 struct dlm_lock_resource *res);
 void dlm_clean_master_list(struct dlm_ctxt *dlm,
 			   u8 dead_node);
 int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock);
-
+int __dlm_lockres_has_locks(struct dlm_lock_resource *res);
 int __dlm_lockres_unused(struct dlm_lock_resource *res);
 
 static inline const char * dlm_lock_mode_name(int mode)

fs/ocfs2/dlm/dlmconvert.c

@@ -286,8 +286,8 @@ enum dlm_status dlmconvert_remote(struct dlm_ctxt *dlm,
 		__dlm_print_one_lock_resource(res);
 		mlog(ML_ERROR, "converting a remote lock that is already "
 		     "converting! (cookie=%u:%llu, conv=%d)\n",
-		     dlm_get_lock_cookie_node(lock->ml.cookie),
-		     dlm_get_lock_cookie_seq(lock->ml.cookie),
+		     dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
+		     dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
 		     lock->ml.convert_type);
 		status = DLM_DENIED;
 		goto bail;
@@ -418,7 +418,8 @@ static enum dlm_status dlm_send_remote_convert_request(struct dlm_ctxt *dlm,
  * returns: DLM_NORMAL, DLM_IVLOCKID, DLM_BADARGS,
  *          status from __dlmconvert_master
  */
-int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data)
+int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data,
+			     void **ret_data)
 {
 	struct dlm_ctxt *dlm = data;
 	struct dlm_convert_lock *cnv = (struct dlm_convert_lock *)msg->buf;
@@ -428,7 +429,7 @@ int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data)
 	struct dlm_lockstatus *lksb;
 	enum dlm_status status = DLM_NORMAL;
 	u32 flags;
-	int call_ast = 0, kick_thread = 0, ast_reserved = 0;
+	int call_ast = 0, kick_thread = 0, ast_reserved = 0, wake = 0;
 
 	if (!dlm_grab(dlm)) {
 		dlm_error(DLM_REJECTED);
@@ -479,25 +480,14 @@ int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data)
 		}
 		lock = NULL;
 	}
-	if (!lock) {
-		__dlm_print_one_lock_resource(res);
-		list_for_each(iter, &res->granted) {
-			lock = list_entry(iter, struct dlm_lock, list);
-			if (lock->ml.node == cnv->node_idx) {
-				mlog(ML_ERROR, "There is something here "
-				     "for node %u, lock->ml.cookie=%llu, "
-				     "cnv->cookie=%llu\n", cnv->node_idx,
-				     (unsigned long long)lock->ml.cookie,
-				     (unsigned long long)cnv->cookie);
-				break;
-			}
-		}
-		lock = NULL;
-	}
 	spin_unlock(&res->spinlock);
 	if (!lock) {
 		status = DLM_IVLOCKID;
-		dlm_error(status);
+		mlog(ML_ERROR, "did not find lock to convert on grant queue! "
+			       "cookie=%u:%llu\n",
+		     dlm_get_lock_cookie_node(be64_to_cpu(cnv->cookie)),
+		     dlm_get_lock_cookie_seq(be64_to_cpu(cnv->cookie)));
+		__dlm_print_one_lock_resource(res);
 		goto leave;
 	}
 
@@ -524,8 +514,11 @@ int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data)
 					     cnv->requested_type,
 					     &call_ast, &kick_thread);
 		res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
+		wake = 1;
 	}
 	spin_unlock(&res->spinlock);
+	if (wake)
+		wake_up(&res->wq);
 
 	if (status != DLM_NORMAL) {
 		if (status != DLM_NOTQUEUED)
@@ -534,12 +527,7 @@ int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data)
 	}
 
 leave:
-	if (!lock)
-		mlog(ML_ERROR, "did not find lock to convert on grant queue! "
-			       "cookie=%u:%llu\n",
-			       dlm_get_lock_cookie_node(cnv->cookie),
-			       dlm_get_lock_cookie_seq(cnv->cookie));
-	else
+	if (lock)
 		dlm_lock_put(lock);
 
 	/* either queue the ast or release it, if reserved */

fs/ocfs2/dlm/dlmdebug.c

@@ -53,6 +53,23 @@ void dlm_print_one_lock_resource(struct dlm_lock_resource *res)
 	spin_unlock(&res->spinlock);
 }
 
+static void dlm_print_lockres_refmap(struct dlm_lock_resource *res)
+{
+	int bit;
+	assert_spin_locked(&res->spinlock);
+
+	mlog(ML_NOTICE, "  refmap nodes: [ ");
+	bit = 0;
+	while (1) {
+		bit = find_next_bit(res->refmap, O2NM_MAX_NODES, bit);
+		if (bit >= O2NM_MAX_NODES)
+			break;
+		printk("%u ", bit);
+		bit++;
+	}
+	printk("], inflight=%u\n", res->inflight_locks);
+}
+
 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res)
 {
 	struct list_head *iter2;
@@ -65,6 +82,7 @@ void __dlm_print_one_lock_resource(struct dlm_lock_resource *res)
 	       res->owner, res->state);
 	mlog(ML_NOTICE, "  last used: %lu, on purge list: %s\n",
 	     res->last_used, list_empty(&res->purge) ? "no" : "yes");
+	dlm_print_lockres_refmap(res);
 	mlog(ML_NOTICE, "  granted queue: \n");
 	list_for_each(iter2, &res->granted) {
 		lock = list_entry(iter2, struct dlm_lock, list);
@@ -72,8 +90,8 @@ void __dlm_print_one_lock_resource(struct dlm_lock_resource *res)
 		mlog(ML_NOTICE, "    type=%d, conv=%d, node=%u, "
 		       "cookie=%u:%llu, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n", 
 		       lock->ml.type, lock->ml.convert_type, lock->ml.node, 
-		       dlm_get_lock_cookie_node(lock->ml.cookie), 
-		       dlm_get_lock_cookie_seq(lock->ml.cookie), 
+		     dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
+		     dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
 		       list_empty(&lock->ast_list) ? 'y' : 'n',
 		       lock->ast_pending ? 'y' : 'n',
 		       list_empty(&lock->bast_list) ? 'y' : 'n',
@@ -87,8 +105,8 @@ void __dlm_print_one_lock_resource(struct dlm_lock_resource *res)
 		mlog(ML_NOTICE, "    type=%d, conv=%d, node=%u, "
 		       "cookie=%u:%llu, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n", 
 		       lock->ml.type, lock->ml.convert_type, lock->ml.node, 
-		       dlm_get_lock_cookie_node(lock->ml.cookie), 
-		       dlm_get_lock_cookie_seq(lock->ml.cookie), 
+		     dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
+		     dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
 		       list_empty(&lock->ast_list) ? 'y' : 'n',
 		       lock->ast_pending ? 'y' : 'n',
 		       list_empty(&lock->bast_list) ? 'y' : 'n',
@@ -102,8 +120,8 @@ void __dlm_print_one_lock_resource(struct dlm_lock_resource *res)
 		mlog(ML_NOTICE, "    type=%d, conv=%d, node=%u, "
 		       "cookie=%u:%llu, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n", 
 		       lock->ml.type, lock->ml.convert_type, lock->ml.node, 
-		       dlm_get_lock_cookie_node(lock->ml.cookie), 
-		       dlm_get_lock_cookie_seq(lock->ml.cookie), 
+		     dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
+		     dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
 		       list_empty(&lock->ast_list) ? 'y' : 'n',
 		       lock->ast_pending ? 'y' : 'n',
 		       list_empty(&lock->bast_list) ? 'y' : 'n',

fs/ocfs2/dlm/dlmlock.c

@@ -163,6 +163,10 @@ static enum dlm_status dlmlock_master(struct dlm_ctxt *dlm,
 			kick_thread = 1;
 		}
 	}
+	/* reduce the inflight count, this may result in the lockres
+	 * being purged below during calc_usage */
+	if (lock->ml.node == dlm->node_num)
+		dlm_lockres_drop_inflight_ref(dlm, res);
 
 	spin_unlock(&res->spinlock);
 	wake_up(&res->wq);
@@ -437,7 +441,8 @@ struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie,
  *   held on exit:  none
  * returns: DLM_NORMAL, DLM_SYSERR, DLM_IVLOCKID, DLM_NOTQUEUED
  */
-int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data)
+int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data,
+			    void **ret_data)
 {
 	struct dlm_ctxt *dlm = data;
 	struct dlm_create_lock *create = (struct dlm_create_lock *)msg->buf;

fs/ocfs2/dlm/dlmthread.c

@@ -54,9 +54,6 @@
 #include "cluster/masklog.h"
 
 static int dlm_thread(void *data);
-static void dlm_purge_lockres_now(struct dlm_ctxt *dlm,
-				  struct dlm_lock_resource *lockres);
-
 static void dlm_flush_asts(struct dlm_ctxt *dlm);
 
 #define dlm_lock_is_remote(dlm, lock)     ((lock)->ml.node != (dlm)->node_num)
@@ -82,14 +79,33 @@ void __dlm_wait_on_lockres_flags(struct dlm_lock_resource *res, int flags)
 	current->state = TASK_RUNNING;
 }
 
-
-int __dlm_lockres_unused(struct dlm_lock_resource *res)
+int __dlm_lockres_has_locks(struct dlm_lock_resource *res)
 {
 	if (list_empty(&res->granted) &&
 	    list_empty(&res->converting) &&
-	    list_empty(&res->blocked) &&
-	    list_empty(&res->dirty))
+	    list_empty(&res->blocked))
+		return 0;
+	return 1;
+}
+
+/* "unused": the lockres has no locks, is not on the dirty list,
+ * has no inflight locks (in the gap between mastery and acquiring
+ * the first lock), and has no bits in its refmap.
+ * truly ready to be freed. */
+int __dlm_lockres_unused(struct dlm_lock_resource *res)
+{
+	if (!__dlm_lockres_has_locks(res) &&
+	    (list_empty(&res->dirty) && !(res->state & DLM_LOCK_RES_DIRTY))) {
+		/* try not to scan the bitmap unless the first two
+		 * conditions are already true */
+		int bit = find_next_bit(res->refmap, O2NM_MAX_NODES, 0);
+		if (bit >= O2NM_MAX_NODES) {
+			/* since the bit for dlm->node_num is not
+			 * set, inflight_locks better be zero */
+			BUG_ON(res->inflight_locks != 0);
 			return 1;
+		}
+	}
 	return 0;
 }
 
@@ -106,46 +122,21 @@ void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
 	assert_spin_locked(&res->spinlock);
 
 	if (__dlm_lockres_unused(res)){
-		/* For now, just keep any resource we master */
-		if (res->owner == dlm->node_num)
-		{
-			if (!list_empty(&res->purge)) {
-				mlog(0, "we master %s:%.*s, but it is on "
-				     "the purge list.  Removing\n",
-				     dlm->name, res->lockname.len,
-				     res->lockname.name);
-				list_del_init(&res->purge);
-				dlm->purge_count--;
-			}
-			return;
-		}
-
 		if (list_empty(&res->purge)) {
-			mlog(0, "putting lockres %.*s from purge list\n",
-			     res->lockname.len, res->lockname.name);
+			mlog(0, "putting lockres %.*s:%p onto purge list\n",
+			     res->lockname.len, res->lockname.name, res);
 
 			res->last_used = jiffies;
+			dlm_lockres_get(res);
 			list_add_tail(&res->purge, &dlm->purge_list);
 			dlm->purge_count++;
-
-			/* if this node is not the owner, there is
-			 * no way to keep track of who the owner could be.
-			 * unhash it to avoid serious problems. */
-			if (res->owner != dlm->node_num) {
-				mlog(0, "%s:%.*s: doing immediate "
-				     "purge of lockres owned by %u\n",
-				     dlm->name, res->lockname.len,
-				     res->lockname.name, res->owner);
-
-				dlm_purge_lockres_now(dlm, res);
-			}
 		}
 	} else if (!list_empty(&res->purge)) {
-		mlog(0, "removing lockres %.*s from purge list, "
-		     "owner=%u\n", res->lockname.len, res->lockname.name,
-		     res->owner);
+		mlog(0, "removing lockres %.*s:%p from purge list, owner=%u\n",
+		     res->lockname.len, res->lockname.name, res, res->owner);
 
 		list_del_init(&res->purge);
+		dlm_lockres_put(res);
 		dlm->purge_count--;
 	}
 }
@@ -163,68 +154,65 @@ void dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
 	spin_unlock(&dlm->spinlock);
 }
 
-/* TODO: Eventual API: Called with the dlm spinlock held, may drop it
- * to do migration, but will re-acquire before exit. */
-void dlm_purge_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *lockres)
+static int dlm_purge_lockres(struct dlm_ctxt *dlm,
+			     struct dlm_lock_resource *res)
 {
 	int master;
-	int ret;
-
-	spin_lock(&lockres->spinlock);
-	master = lockres->owner == dlm->node_num;
-	spin_unlock(&lockres->spinlock);
+	int ret = 0;
 
-	mlog(0, "purging lockres %.*s, master = %d\n", lockres->lockname.len,
-	     lockres->lockname.name, master);
-
-	/* Non master is the easy case -- no migration required, just
-	 * quit. */
+	spin_lock(&res->spinlock);
+	if (!__dlm_lockres_unused(res)) {
+		spin_unlock(&res->spinlock);
+		mlog(0, "%s:%.*s: tried to purge but not unused\n",
+		     dlm->name, res->lockname.len, res->lockname.name);
+		return -ENOTEMPTY;
+	}
+	master = (res->owner == dlm->node_num);
 	if (!master)
-		goto finish;
-
-	/* Wheee! Migrate lockres here! */
-	spin_unlock(&dlm->spinlock);
-again:
+		res->state |= DLM_LOCK_RES_DROPPING_REF;
+	spin_unlock(&res->spinlock);
 
-	ret = dlm_migrate_lockres(dlm, lockres, O2NM_MAX_NODES);
-	if (ret == -ENOTEMPTY) {
-		mlog(ML_ERROR, "lockres %.*s still has local locks!\n",
-		     lockres->lockname.len, lockres->lockname.name);
+	mlog(0, "purging lockres %.*s, master = %d\n", res->lockname.len,
+	     res->lockname.name, master);
 
+	if (!master) {
+		spin_lock(&res->spinlock);
+		/* This ensures that clear refmap is sent after the set */
+		__dlm_wait_on_lockres_flags(res, DLM_LOCK_RES_SETREF_INPROG);
+		spin_unlock(&res->spinlock);
+		/* drop spinlock to do messaging, retake below */
+		spin_unlock(&dlm->spinlock);
+		/* clear our bit from the master's refmap, ignore errors */
+		ret = dlm_drop_lockres_ref(dlm, res);
+		if (ret < 0) {
+			mlog_errno(ret);
+			if (!dlm_is_host_down(ret))
 				BUG();
-	} else if (ret < 0) {
-		mlog(ML_NOTICE, "lockres %.*s: migrate failed, retrying\n",
-		     lockres->lockname.len, lockres->lockname.name);
-		msleep(100);
-		goto again;
 		}
-
+		mlog(0, "%s:%.*s: dlm_deref_lockres returned %d\n",
+		     dlm->name, res->lockname.len, res->lockname.name, ret);
 		spin_lock(&dlm->spinlock);
+	}
 
-finish:
-	if (!list_empty(&lockres->purge)) {
-		list_del_init(&lockres->purge);
+	if (!list_empty(&res->purge)) {
+		mlog(0, "removing lockres %.*s:%p from purgelist, "
+		     "master = %d\n", res->lockname.len, res->lockname.name,
+		     res, master);
+		list_del_init(&res->purge);
+		dlm_lockres_put(res);
 		dlm->purge_count--;
 	}
-	__dlm_unhash_lockres(lockres);
-}
-
-/* make an unused lockres go away immediately.
- * as soon as the dlm spinlock is dropped, this lockres
- * will not be found. kfree still happens on last put. */
-static void dlm_purge_lockres_now(struct dlm_ctxt *dlm,
-				  struct dlm_lock_resource *lockres)
-{
-	assert_spin_locked(&dlm->spinlock);
-	assert_spin_locked(&lockres->spinlock);
-
-	BUG_ON(!__dlm_lockres_unused(lockres));
+	__dlm_unhash_lockres(res);
 
-	if (!list_empty(&lockres->purge)) {
-		list_del_init(&lockres->purge);
-		dlm->purge_count--;
+	/* lockres is not in the hash now.  drop the flag and wake up
+	 * any processes waiting in dlm_get_lock_resource. */
+	if (!master) {
+		spin_lock(&res->spinlock);
+		res->state &= ~DLM_LOCK_RES_DROPPING_REF;
+		spin_unlock(&res->spinlock);
+		wake_up(&res->wq);
 	}
-	__dlm_unhash_lockres(lockres);
+	return 0;
 }
 
 static void dlm_run_purge_list(struct dlm_ctxt *dlm,
@@ -268,13 +256,17 @@ static void dlm_run_purge_list(struct dlm_ctxt *dlm,
 			break;
 		}
 
+		mlog(0, "removing lockres %.*s:%p from purgelist\n",
+		     lockres->lockname.len, lockres->lockname.name, lockres);
 		list_del_init(&lockres->purge);
+		dlm_lockres_put(lockres);
 		dlm->purge_count--;
 
 		/* This may drop and reacquire the dlm spinlock if it
 		 * has to do migration. */
 		mlog(0, "calling dlm_purge_lockres!\n");
-		dlm_purge_lockres(dlm, lockres);
+		if (dlm_purge_lockres(dlm, lockres))
+			BUG();
 		mlog(0, "DONE calling dlm_purge_lockres!\n");
 
 		/* Avoid adding any scheduling latencies */
@@ -467,13 +459,18 @@ void __dlm_dirty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
 	assert_spin_locked(&res->spinlock);
 
 	/* don't shuffle secondary queues */
-	if ((res->owner == dlm->node_num) &&
-	    !(res->state & DLM_LOCK_RES_DIRTY)) {
+	if ((res->owner == dlm->node_num)) {
+		if (res->state & (DLM_LOCK_RES_MIGRATING |
+				  DLM_LOCK_RES_BLOCK_DIRTY))
+		    return;
+
+		if (list_empty(&res->dirty)) {
 			/* ref for dirty_list */
 			dlm_lockres_get(res);
 			list_add_tail(&res->dirty, &dlm->dirty_list);
 			res->state |= DLM_LOCK_RES_DIRTY;
 		}
+	}
 }
 
 
@@ -651,7 +648,7 @@ static int dlm_thread(void *data)
 			dlm_lockres_get(res);
 
 			spin_lock(&res->spinlock);
-			res->state &= ~DLM_LOCK_RES_DIRTY;
+			/* We clear the DLM_LOCK_RES_DIRTY state once we shuffle lists below */
 			list_del_init(&res->dirty);
 			spin_unlock(&res->spinlock);
 			spin_unlock(&dlm->spinlock);
@@ -675,10 +672,11 @@ static int dlm_thread(void *data)
 			/* it is now ok to move lockreses in these states
 			 * to the dirty list, assuming that they will only be
 			 * dirty for a short while. */
+			BUG_ON(res->state & DLM_LOCK_RES_MIGRATING);
 			if (res->state & (DLM_LOCK_RES_IN_PROGRESS |
-					  DLM_LOCK_RES_MIGRATING |
 					  DLM_LOCK_RES_RECOVERING)) {
 				/* move it to the tail and keep going */
+				res->state &= ~DLM_LOCK_RES_DIRTY;
 				spin_unlock(&res->spinlock);
 				mlog(0, "delaying list shuffling for in-"
 				     "progress lockres %.*s, state=%d\n",
@@ -699,6 +697,7 @@ static int dlm_thread(void *data)
 
 			/* called while holding lockres lock */
 			dlm_shuffle_lists(dlm, res);
+			res->state &= ~DLM_LOCK_RES_DIRTY;
 			spin_unlock(&res->spinlock);
 
 			dlm_lockres_calc_usage(dlm, res);
@@ -709,11 +708,8 @@ static int dlm_thread(void *data)
 			/* if the lock was in-progress, stick
 			 * it on the back of the list */
 			if (delay) {
-				/* ref for dirty_list */
-				dlm_lockres_get(res);
 				spin_lock(&res->spinlock);
-				list_add_tail(&res->dirty, &dlm->dirty_list);
-				res->state |= DLM_LOCK_RES_DIRTY;
+				__dlm_dirty_lockres(dlm, res);
 				spin_unlock(&res->spinlock);
 			}
 			dlm_lockres_put(res);

fs/ocfs2/dlm/dlmunlock.c

@@ -147,6 +147,10 @@ static enum dlm_status dlmunlock_common(struct dlm_ctxt *dlm,
 		goto leave;
 	}
 
+	if (res->state & DLM_LOCK_RES_MIGRATING) {
+		status = DLM_MIGRATING;
+		goto leave;
+	}
 
 	/* see above for what the spec says about
 	 * LKM_CANCEL and the lock queue state */
@@ -244,8 +248,8 @@ static enum dlm_status dlmunlock_common(struct dlm_ctxt *dlm,
 		/* this should always be coupled with list removal */
 		BUG_ON(!(actions & DLM_UNLOCK_REMOVE_LOCK));
 		mlog(0, "lock %u:%llu should be gone now! refs=%d\n",
-		     dlm_get_lock_cookie_node(lock->ml.cookie),
-		     dlm_get_lock_cookie_seq(lock->ml.cookie),
+		     dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
+		     dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
 		     atomic_read(&lock->lock_refs.refcount)-1);
 		dlm_lock_put(lock);
 	}
@@ -379,7 +383,8 @@ static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm,
  * returns: DLM_NORMAL, DLM_BADARGS, DLM_IVLOCKID,
  *          return value from dlmunlock_master
  */
-int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data)
+int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data,
+			    void **ret_data)
 {
 	struct dlm_ctxt *dlm = data;
 	struct dlm_unlock_lock *unlock = (struct dlm_unlock_lock *)msg->buf;
@@ -502,8 +507,8 @@ int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data)
 	if (!found)
 		mlog(ML_ERROR, "failed to find lock to unlock! "
 			       "cookie=%u:%llu\n",
-			       dlm_get_lock_cookie_node(unlock->cookie),
-			       dlm_get_lock_cookie_seq(unlock->cookie));
+		     dlm_get_lock_cookie_node(be64_to_cpu(unlock->cookie)),
+		     dlm_get_lock_cookie_seq(be64_to_cpu(unlock->cookie)));
 	else
 		dlm_lock_put(lock);
 

fs/ocfs2/vote.c

@@ -887,7 +887,7 @@ static inline int ocfs2_translate_response(int response)
 
 static int ocfs2_handle_response_message(struct o2net_msg *msg,
 					 u32 len,
-					 void *data)
+					 void *data, void **ret_data)
 {
 	unsigned int response_id, node_num;
 	int response_status;
@@ -943,7 +943,7 @@ static int ocfs2_handle_response_message(struct o2net_msg *msg,
 
 static int ocfs2_handle_vote_message(struct o2net_msg *msg,
 				     u32 len,
-				     void *data)
+				     void *data, void **ret_data)
 {
 	int status;
 	struct ocfs2_super *osb = data;
@@ -1007,7 +1007,7 @@ int ocfs2_register_net_handlers(struct ocfs2_super *osb)
 					osb->net_key,
 					sizeof(struct ocfs2_response_msg),
 					ocfs2_handle_response_message,
-					osb, &osb->osb_net_handlers);
+					osb, NULL, &osb->osb_net_handlers);
 	if (status) {
 		mlog_errno(status);
 		goto bail;
@@ -1017,7 +1017,7 @@ int ocfs2_register_net_handlers(struct ocfs2_super *osb)
 					osb->net_key,
 					sizeof(struct ocfs2_vote_msg),
 					ocfs2_handle_vote_message,
-					osb, &osb->osb_net_handlers);
+					osb, NULL, &osb->osb_net_handlers);
 	if (status) {
 		mlog_errno(status);
 		goto bail;