Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm:
  dlm: add __init and __exit marks to init and exit functions
  dlm: eliminate astparam type casting
  dlm: proper types for asts and basts
  dlm: dlm/user.c input validation fixes
  dlm: fix dlm_dir_lookup() handling of too long names
  dlm: fix overflows when copying from ->m_extra to lvb
  dlm: make find_rsb() fail gracefully when namelen is too large
  dlm: receive_rcom_lock_args() overflow check
  dlm: verify that places expecting rcom_lock have packet long enough
  dlm: validate data in dlm_recover_directory()
  dlm: missing length check in check_config()
  dlm: use proper type for ->ls_recover_buf
  dlm: do not byteswap rcom_config
  dlm: do not byteswap rcom_lock
  dlm: dlm_process_incoming_buffer() fixes
  dlm: use proper C for dlm/requestqueue stuff (and fix alignment bug)

17 files changed, 235 insertions, 225 deletions

diff --git a/fs/dlm/ast.c b/fs/dlm/ast.c
index 6308122..8bf31e3 100644
--- a/fs/dlm/ast.c
+++ b/fs/dlm/ast.c
@@ -39,7 +39,6 @@ void dlm_add_ast(struct dlm_lkb *lkb, int type)
 		dlm_user_add_ast(lkb, type);
 		return;
 	}
-	DLM_ASSERT(lkb->lkb_astaddr != DLM_FAKE_USER_AST, dlm_print_lkb(lkb););
 
 	spin_lock(&ast_queue_lock);
 	if (!(lkb->lkb_ast_type & (AST_COMP | AST_BAST))) {
@@ -58,8 +57,8 @@ static void process_asts(void)
 	struct dlm_ls *ls = NULL;
 	struct dlm_rsb *r = NULL;
 	struct dlm_lkb *lkb;
-	void (*cast) (long param);
-	void (*bast) (long param, int mode);
+	void (*cast) (void *astparam);
+	void (*bast) (void *astparam, int mode);
 	int type = 0, found, bmode;
 
 	for (;;) {
@@ -83,8 +82,8 @@ static void process_asts(void)
 		if (!found)
 			break;
 
-		cast = lkb->lkb_astaddr;
-		bast = lkb->lkb_bastaddr;
+		cast = lkb->lkb_astfn;
+		bast = lkb->lkb_bastfn;
 		bmode = lkb->lkb_bastmode;
 
 		if ((type & AST_COMP) && cast)
diff --git a/fs/dlm/config.c b/fs/dlm/config.c
index 2f8e3c8..c3ad1df 100644
--- a/fs/dlm/config.c
+++ b/fs/dlm/config.c
@@ -604,7 +604,7 @@ static struct clusters clusters_root = {
 	},
 };
 
-int dlm_config_init(void)
+int __init dlm_config_init(void)
 {
 	config_group_init(&clusters_root.subsys.su_group);
 	mutex_init(&clusters_root.subsys.su_mutex);
diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
index 12c3bfd..8fc24f4 100644
--- a/fs/dlm/debug_fs.c
+++ b/fs/dlm/debug_fs.c
@@ -162,14 +162,12 @@ static int print_resource(struct dlm_rsb *res, struct seq_file *s)
 
 static void print_lock(struct seq_file *s, struct dlm_lkb *lkb, struct dlm_rsb *r)
 {
-	struct dlm_user_args *ua;
 	unsigned int waiting = 0;
 	uint64_t xid = 0;
 
 	if (lkb->lkb_flags & DLM_IFL_USER) {
-		ua = (struct dlm_user_args *) lkb->lkb_astparam;
-		if (ua)
-			xid = ua->xid;
+		if (lkb->lkb_ua)
+			xid = lkb->lkb_ua->xid;
 	}
 
 	if (lkb->lkb_timestamp)
@@ -543,7 +541,7 @@ void dlm_delete_debug_file(struct dlm_ls *ls)
 		debugfs_remove(ls->ls_debug_locks_dentry);
 }
 
-int dlm_register_debugfs(void)
+int __init dlm_register_debugfs(void)
 {
 	mutex_init(&debug_buf_lock);
 	dlm_root = debugfs_create_dir("dlm", NULL);
diff --git a/fs/dlm/dir.c b/fs/dlm/dir.c
index ff97ba9..85defeb 100644
--- a/fs/dlm/dir.c
+++ b/fs/dlm/dir.c
@@ -220,6 +220,7 @@ int dlm_recover_directory(struct dlm_ls *ls)
 		last_len = 0;
 
 		for (;;) {
+			int left;
 			error = dlm_recovery_stopped(ls);
 			if (error)
 				goto out_free;
@@ -235,12 +236,21 @@ int dlm_recover_directory(struct dlm_ls *ls)
 			 * pick namelen/name pairs out of received buffer
 			 */
 
-			b = ls->ls_recover_buf + sizeof(struct dlm_rcom);
+			b = ls->ls_recover_buf->rc_buf;
+			left = ls->ls_recover_buf->rc_header.h_length;
+			left -= sizeof(struct dlm_rcom);
 
 			for (;;) {
-				memcpy(&namelen, b, sizeof(uint16_t));
-				namelen = be16_to_cpu(namelen);
-				b += sizeof(uint16_t);
+				__be16 v;
+
+				error = -EINVAL;
+				if (left < sizeof(__be16))
+					goto out_free;
+
+				memcpy(&v, b, sizeof(__be16));
+				namelen = be16_to_cpu(v);
+				b += sizeof(__be16);
+				left -= sizeof(__be16);
 
 				/* namelen of 0xFFFFF marks end of names for
 				   this node; namelen of 0 marks end of the
@@ -251,6 +261,12 @@ int dlm_recover_directory(struct dlm_ls *ls)
 				if (!namelen)
 					break;
 
+				if (namelen > left)
+					goto out_free;
+
+				if (namelen > DLM_RESNAME_MAXLEN)
+					goto out_free;
+
 				error = -ENOMEM;
 				de = get_free_de(ls, namelen);
 				if (!de)
@@ -262,6 +278,7 @@ int dlm_recover_directory(struct dlm_ls *ls)
 				memcpy(de->name, b, namelen);
 				memcpy(last_name, b, namelen);
 				b += namelen;
+				left -= namelen;
 
 				add_entry_to_hash(ls, de);
 				count++;
@@ -302,6 +319,9 @@ static int get_entry(struct dlm_ls *ls, int nodeid, char *name,
 
 	write_unlock(&ls->ls_dirtbl[bucket].lock);
 
+	if (namelen > DLM_RESNAME_MAXLEN)
+		return -EINVAL;
+
 	de = kzalloc(sizeof(struct dlm_direntry) + namelen, GFP_KERNEL);
 	if (!de)
 		return -ENOMEM;
diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index ec61bba..d30ea8b 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -92,8 +92,6 @@ do { \
   } \
 }
 
-#define DLM_FAKE_USER_AST ERR_PTR(-EINVAL)
-
 
 struct dlm_direntry {
 	struct list_head	list;
@@ -146,9 +144,9 @@ struct dlm_recover {
 
 struct dlm_args {
 	uint32_t		flags;
-	void			*astaddr;
-	long			astparam;
-	void			*bastaddr;
+	void			(*astfn) (void *astparam);
+	void			*astparam;
+	void			(*bastfn) (void *astparam, int mode);
 	int			mode;
 	struct dlm_lksb		*lksb;
 	unsigned long		timeout;
@@ -253,9 +251,12 @@ struct dlm_lkb {
 
 	char			*lkb_lvbptr;
 	struct dlm_lksb		*lkb_lksb;      /* caller's status block */
-	void			*lkb_astaddr;	/* caller's ast function */
-	void			*lkb_bastaddr;	/* caller's bast function */
-	long			lkb_astparam;	/* caller's ast arg */
+	void			(*lkb_astfn) (void *astparam);
+	void			(*lkb_bastfn) (void *astparam, int mode);
+	union {
+		void			*lkb_astparam;	/* caller's ast arg */
+		struct dlm_user_args	*lkb_ua;
+	};
 };
 
 
@@ -403,28 +404,34 @@ struct dlm_rcom {
 	char			rc_buf[0];
 };
 
+union dlm_packet {
+	struct dlm_header	header;		/* common to other two */
+	struct dlm_message	message;
+	struct dlm_rcom		rcom;
+};
+
 struct rcom_config {
-	uint32_t		rf_lvblen;
-	uint32_t		rf_lsflags;
-	uint64_t		rf_unused;
+	__le32			rf_lvblen;
+	__le32			rf_lsflags;
+	__le64			rf_unused;
 };
 
 struct rcom_lock {
-	uint32_t		rl_ownpid;
-	uint32_t		rl_lkid;
-	uint32_t		rl_remid;
-	uint32_t		rl_parent_lkid;
-	uint32_t		rl_parent_remid;
-	uint32_t		rl_exflags;
-	uint32_t		rl_flags;
-	uint32_t		rl_lvbseq;
-	int			rl_result;
+	__le32			rl_ownpid;
+	__le32			rl_lkid;
+	__le32			rl_remid;
+	__le32			rl_parent_lkid;
+	__le32			rl_parent_remid;
+	__le32			rl_exflags;
+	__le32			rl_flags;
+	__le32			rl_lvbseq;
+	__le32			rl_result;
 	int8_t			rl_rqmode;
 	int8_t			rl_grmode;
 	int8_t			rl_status;
 	int8_t			rl_asts;
-	uint16_t		rl_wait_type;
-	uint16_t		rl_namelen;
+	__le16			rl_wait_type;
+	__le16			rl_namelen;
 	char			rl_name[DLM_RESNAME_MAXLEN];
 	char			rl_lvb[0];
 };
@@ -494,7 +501,7 @@ struct dlm_ls {
 	struct rw_semaphore	ls_recv_active;	/* block dlm_recv */
 	struct list_head	ls_requestqueue;/* queue remote requests */
 	struct mutex		ls_requestqueue_mutex;
-	char			*ls_recover_buf;
+	struct dlm_rcom		*ls_recover_buf;
 	int			ls_recover_nodeid; /* for debugging */
 	uint64_t		ls_rcom_seq;
 	spinlock_t		ls_rcom_spin;
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index ff4a198..8f250ac 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -436,11 +436,15 @@ static int find_rsb(struct dlm_ls *ls, char *name, int namelen,
 {
 	struct dlm_rsb *r, *tmp;
 	uint32_t hash, bucket;
-	int error = 0;
+	int error = -EINVAL;
+
+	if (namelen > DLM_RESNAME_MAXLEN)
+		goto out;
 
 	if (dlm_no_directory(ls))
 		flags |= R_CREATE;
 
+	error = 0;
 	hash = jhash(name, namelen, 0);
 	bucket = hash & (ls->ls_rsbtbl_size - 1);
 
@@ -1222,6 +1226,8 @@ static void set_lvb_lock_pc(struct dlm_rsb *r, struct dlm_lkb *lkb,
 	b = dlm_lvb_operations[lkb->lkb_grmode + 1][lkb->lkb_rqmode + 1];
 	if (b == 1) {
 		int len = receive_extralen(ms);
+		if (len > DLM_RESNAME_MAXLEN)
+			len = DLM_RESNAME_MAXLEN;
 		memcpy(lkb->lkb_lvbptr, ms->m_extra, len);
 		lkb->lkb_lvbseq = ms->m_lvbseq;
 	}
@@ -1775,7 +1781,7 @@ static void grant_pending_locks(struct dlm_rsb *r)
 	 */
 
 	list_for_each_entry_safe(lkb, s, &r->res_grantqueue, lkb_statequeue) {
-		if (lkb->lkb_bastaddr && lock_requires_bast(lkb, high, cw)) {
+		if (lkb->lkb_bastfn && lock_requires_bast(lkb, high, cw)) {
 			if (cw && high == DLM_LOCK_PR)
 				queue_bast(r, lkb, DLM_LOCK_CW);
 			else
@@ -1805,7 +1811,7 @@ static void send_bast_queue(struct dlm_rsb *r, struct list_head *head,
 	struct dlm_lkb *gr;
 
 	list_for_each_entry(gr, head, lkb_statequeue) {
-		if (gr->lkb_bastaddr && modes_require_bast(gr, lkb)) {
+		if (gr->lkb_bastfn && modes_require_bast(gr, lkb)) {
 			queue_bast(r, gr, lkb->lkb_rqmode);
 			gr->lkb_highbast = lkb->lkb_rqmode;
 		}
@@ -1960,8 +1966,11 @@ static void confirm_master(struct dlm_rsb *r, int error)
 }
 
 static int set_lock_args(int mode, struct dlm_lksb *lksb, uint32_t flags,
-			 int namelen, unsigned long timeout_cs, void *ast,
-			 void *astarg, void *bast, struct dlm_args *args)
+			 int namelen, unsigned long timeout_cs,
+			 void (*ast) (void *astparam),
+			 void *astparam,
+			 void (*bast) (void *astparam, int mode),
+			 struct dlm_args *args)
 {
 	int rv = -EINVAL;
 
@@ -2011,9 +2020,9 @@ static int set_lock_args(int mode, struct dlm_lksb *lksb, uint32_t flags,
 	   an active lkb cannot be modified before locking the rsb */
 
 	args->flags = flags;
-	args->astaddr = ast;
-	args->astparam = (long) astarg;
-	args->bastaddr = bast;
+	args->astfn = ast;
+	args->astparam = astparam;
+	args->bastfn = bast;
 	args->timeout = timeout_cs;
 	args->mode = mode;
 	args->lksb = lksb;
@@ -2032,7 +2041,7 @@ static int set_unlock_args(uint32_t flags, void *astarg, struct dlm_args *args)
 		return -EINVAL;
 
 	args->flags = flags;
-	args->astparam = (long) astarg;
+	args->astparam = astarg;
 	return 0;
 }
 
@@ -2062,9 +2071,9 @@ static int validate_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
 
 	lkb->lkb_exflags = args->flags;
 	lkb->lkb_sbflags = 0;
-	lkb->lkb_astaddr = args->astaddr;
+	lkb->lkb_astfn = args->astfn;
 	lkb->lkb_astparam = args->astparam;
-	lkb->lkb_bastaddr = args->bastaddr;
+	lkb->lkb_bastfn = args->bastfn;
 	lkb->lkb_rqmode = args->mode;
 	lkb->lkb_lksb = args->lksb;
 	lkb->lkb_lvbptr = args->lksb->sb_lvbptr;
@@ -2711,9 +2720,9 @@ static void send_args(struct dlm_rsb *r, struct dlm_lkb *lkb,
 	/* m_result and m_bastmode are set from function args,
 	   not from lkb fields */
 
-	if (lkb->lkb_bastaddr)
+	if (lkb->lkb_bastfn)
 		ms->m_asts |= AST_BAST;
-	if (lkb->lkb_astaddr)
+	if (lkb->lkb_astfn)
 		ms->m_asts |= AST_COMP;
 
 	/* compare with switch in create_message; send_remove() doesn't
@@ -2989,11 +2998,23 @@ static int receive_lvb(struct dlm_ls *ls, struct dlm_lkb *lkb,
 		if (!lkb->lkb_lvbptr)
 			return -ENOMEM;
 		len = receive_extralen(ms);
+		if (len > DLM_RESNAME_MAXLEN)
+			len = DLM_RESNAME_MAXLEN;
 		memcpy(lkb->lkb_lvbptr, ms->m_extra, len);
 	}
 	return 0;
 }
 
+static void fake_bastfn(void *astparam, int mode)
+{
+	log_print("fake_bastfn should not be called");
+}
+
+static void fake_astfn(void *astparam)
+{
+	log_print("fake_astfn should not be called");
+}
+
 static int receive_request_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
 				struct dlm_message *ms)
 {
@@ -3002,8 +3023,9 @@ static int receive_request_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
 	lkb->lkb_remid = ms->m_lkid;
 	lkb->lkb_grmode = DLM_LOCK_IV;
 	lkb->lkb_rqmode = ms->m_rqmode;
-	lkb->lkb_bastaddr = (void *) (long) (ms->m_asts & AST_BAST);
-	lkb->lkb_astaddr = (void *) (long) (ms->m_asts & AST_COMP);
+
+	lkb->lkb_bastfn = (ms->m_asts & AST_BAST) ? &fake_bastfn : NULL;
+	lkb->lkb_astfn = (ms->m_asts & AST_COMP) ? &fake_astfn : NULL;
 
 	if (lkb->lkb_exflags & DLM_LKF_VALBLK) {
 		/* lkb was just created so there won't be an lvb yet */
@@ -3802,7 +3824,7 @@ static void dlm_receive_message(struct dlm_ls *ls, struct dlm_message *ms,
 				int nodeid)
 {
 	if (dlm_locking_stopped(ls)) {
-		dlm_add_requestqueue(ls, nodeid, (struct dlm_header *) ms);
+		dlm_add_requestqueue(ls, nodeid, ms);
 	} else {
 		dlm_wait_requestqueue(ls);
 		_receive_message(ls, ms);
@@ -3822,21 +3844,20 @@ void dlm_receive_message_saved(struct dlm_ls *ls, struct dlm_message *ms)
    standard locking activity) or an RCOM (recovery message sent as part of
    lockspace recovery). */
 
-void dlm_receive_buffer(struct dlm_header *hd, int nodeid)
+void dlm_receive_buffer(union dlm_packet *p, int nodeid)
 {
-	struct dlm_message *ms = (struct dlm_message *) hd;
-	struct dlm_rcom *rc = (struct dlm_rcom *) hd;
+	struct dlm_header *hd = &p->header;
 	struct dlm_ls *ls;
 	int type = 0;
 
 	switch (hd->h_cmd) {
 	case DLM_MSG:
-		dlm_message_in(ms);
-		type = ms->m_type;
+		dlm_message_in(&p->message);
+		type = p->message.m_type;
 		break;
 	case DLM_RCOM:
-		dlm_rcom_in(rc);
-		type = rc->rc_type;
+		dlm_rcom_in(&p->rcom);
+		type = p->rcom.rc_type;
 		break;
 	default:
 		log_print("invalid h_cmd %d from %u", hd->h_cmd, nodeid);
@@ -3856,7 +3877,7 @@ void dlm_receive_buffer(struct dlm_header *hd, int nodeid)
 				  hd->h_lockspace, nodeid, hd->h_cmd, type);
 
 		if (hd->h_cmd == DLM_RCOM && type == DLM_RCOM_STATUS)
-			dlm_send_ls_not_ready(nodeid, rc);
+			dlm_send_ls_not_ready(nodeid, &p->rcom);
 		return;
 	}
 
@@ -3865,9 +3886,9 @@ void dlm_receive_buffer(struct dlm_header *hd, int nodeid)
 
 	down_read(&ls->ls_recv_active);
 	if (hd->h_cmd == DLM_MSG)
-		dlm_receive_message(ls, ms, nodeid);
+		dlm_receive_message(ls, &p->message, nodeid);
 	else
-		dlm_receive_rcom(ls, rc, nodeid);
+		dlm_receive_rcom(ls, &p->rcom, nodeid);
 	up_read(&ls->ls_recv_active);
 
 	dlm_put_lockspace(ls);
@@ -4267,32 +4288,34 @@ static struct dlm_lkb *search_remid(struct dlm_rsb *r, int nodeid,
 	return NULL;
 }
 
+/* needs at least dlm_rcom + rcom_lock */
 static int receive_rcom_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
 				  struct dlm_rsb *r, struct dlm_rcom *rc)
 {
 	struct rcom_lock *rl = (struct rcom_lock *) rc->rc_buf;
-	int lvblen;
 
 	lkb->lkb_nodeid = rc->rc_header.h_nodeid;
-	lkb->lkb_ownpid = rl->rl_ownpid;
-	lkb->lkb_remid = rl->rl_lkid;
-	lkb->lkb_exflags = rl->rl_exflags;
-	lkb->lkb_flags = rl->rl_flags & 0x0000FFFF;
+	lkb->lkb_ownpid = le32_to_cpu(rl->rl_ownpid);
+	lkb->lkb_remid = le32_to_cpu(rl->rl_lkid);
+	lkb->lkb_exflags = le32_to_cpu(rl->rl_exflags);
+	lkb->lkb_flags = le32_to_cpu(rl->rl_flags) & 0x0000FFFF;
 	lkb->lkb_flags |= DLM_IFL_MSTCPY;
-	lkb->lkb_lvbseq = rl->rl_lvbseq;
+	lkb->lkb_lvbseq = le32_to_cpu(rl->rl_lvbseq);
 	lkb->lkb_rqmode = rl->rl_rqmode;
 	lkb->lkb_grmode = rl->rl_grmode;
 	/* don't set lkb_status because add_lkb wants to itself */
 
-	lkb->lkb_bastaddr = (void *) (long) (rl->rl_asts & AST_BAST);
-	lkb->lkb_astaddr = (void *) (long) (rl->rl_asts & AST_COMP);
+	lkb->lkb_bastfn = (rl->rl_asts & AST_BAST) ? &fake_bastfn : NULL;
+	lkb->lkb_astfn = (rl->rl_asts & AST_COMP) ? &fake_astfn : NULL;
 
 	if (lkb->lkb_exflags & DLM_LKF_VALBLK) {
+		int lvblen = rc->rc_header.h_length - sizeof(struct dlm_rcom) -
+			 sizeof(struct rcom_lock);
+		if (lvblen > ls->ls_lvblen)
+			return -EINVAL;
 		lkb->lkb_lvbptr = dlm_allocate_lvb(ls);
 		if (!lkb->lkb_lvbptr)
 			return -ENOMEM;
-		lvblen = rc->rc_header.h_length - sizeof(struct dlm_rcom) -
-			 sizeof(struct rcom_lock);
 		memcpy(lkb->lkb_lvbptr, rl->rl_lvb, lvblen);
 	}
 
@@ -4300,7 +4323,8 @@ static int receive_rcom_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
 	   The real granted mode of these converting locks cannot be determined
 	   until all locks have been rebuilt on the rsb (recover_conversion) */
 
-	if (rl->rl_wait_type == DLM_MSG_CONVERT && middle_conversion(lkb)) {
+	if (rl->rl_wait_type == cpu_to_le16(DLM_MSG_CONVERT) &&
+	    middle_conversion(lkb)) {
 		rl->rl_status = DLM_LKSTS_CONVERT;
 		lkb->lkb_grmode = DLM_LOCK_IV;
 		rsb_set_flag(r, RSB_RECOVER_CONVERT);
@@ -4315,6 +4339,7 @@ static int receive_rcom_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
    the given values and send back our lkid.  We send back our lkid by sending
    back the rcom_lock struct we got but with the remid field filled in. */
 
+/* needs at least dlm_rcom + rcom_lock */
 int dlm_recover_master_copy(struct dlm_ls *ls, struct dlm_rcom *rc)
 {
 	struct rcom_lock *rl = (struct rcom_lock *) rc->rc_buf;
@@ -4327,13 +4352,14 @@ int dlm_recover_master_copy(struct dlm_ls *ls, struct dlm_rcom *rc)
 		goto out;
 	}
 
-	error = find_rsb(ls, rl->rl_name, rl->rl_namelen, R_MASTER, &r);
+	error = find_rsb(ls, rl->rl_name, le16_to_cpu(rl->rl_namelen),
+			 R_MASTER, &r);
 	if (error)
 		goto out;
 
 	lock_rsb(r);
 
-	lkb = search_remid(r, rc->rc_header.h_nodeid, rl->rl_lkid);
+	lkb = search_remid(r, rc->rc_header.h_nodeid, le32_to_cpu(rl->rl_lkid));
 	if (lkb) {
 		error = -EEXIST;
 		goto out_remid;
@@ -4356,18 +4382,20 @@ int dlm_recover_master_copy(struct dlm_ls *ls, struct dlm_rcom *rc)
  out_remid:
 	/* this is the new value returned to the lock holder for
 	   saving in its process-copy lkb */
-	rl->rl_remid = lkb->lkb_id;
+	rl->rl_remid = cpu_to_le32(lkb->lkb_id);
 
  out_unlock:
 	unlock_rsb(r);
 	put_rsb(r);
  out:
 	if (error)
-		log_debug(ls, "recover_master_copy %d %x", error, rl->rl_lkid);
-	rl->rl_result = error;
+		log_debug(ls, "recover_master_copy %d %x", error,
+			  le32_to_cpu(rl->rl_lkid));
+	rl->rl_result = cpu_to_le32(error);
 	return error;
 }
 
+/* needs at least dlm_rcom + rcom_lock */
 int dlm_recover_process_copy(struct dlm_ls *ls, struct dlm_rcom *rc)
 {
 	struct rcom_lock *rl = (struct rcom_lock *) rc->rc_buf;
@@ -4375,15 +4403,16 @@ int dlm_recover_process_copy(struct dlm_ls *ls, struct dlm_rcom *rc)
 	struct dlm_lkb *lkb;
 	int error;
 
-	error = find_lkb(ls, rl->rl_lkid, &lkb);
+	error = find_lkb(ls, le32_to_cpu(rl->rl_lkid), &lkb);
 	if (error) {
-		log_error(ls, "recover_process_copy no lkid %x", rl->rl_lkid);
+		log_error(ls, "recover_process_copy no lkid %x",
+				le32_to_cpu(rl->rl_lkid));
 		return error;
 	}
 
 	DLM_ASSERT(is_process_copy(lkb), dlm_print_lkb(lkb););
 
-	error = rl->rl_result;
+	error = le32_to_cpu(rl->rl_result);
 
 	r = lkb->lkb_resource;
 	hold_rsb(r);
@@ -4402,7 +4431,7 @@ int dlm_recover_process_copy(struct dlm_ls *ls, struct dlm_rcom *rc)
 		log_debug(ls, "master copy exists %x", lkb->lkb_id);
 		/* fall through */
 	case 0:
-		lkb->lkb_remid = rl->rl_remid;
+		lkb->lkb_remid = le32_to_cpu(rl->rl_remid);
 		break;
 	default:
 		log_error(ls, "dlm_recover_process_copy unknown error %d %x",
@@ -4451,7 +4480,7 @@ int dlm_user_request(struct dlm_ls *ls, struct dlm_user_args *ua,
 	   lock and that lkb_astparam is the dlm_user_args structure. */
 
 	error = set_lock_args(mode, &ua->lksb, flags, namelen, timeout_cs,
-			      DLM_FAKE_USER_AST, ua, DLM_FAKE_USER_AST, &args);
+			      fake_astfn, ua, fake_bastfn, &args);
 	lkb->lkb_flags |= DLM_IFL_USER;
 	ua->old_mode = DLM_LOCK_IV;
 
@@ -4504,7 +4533,7 @@ int dlm_user_convert(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
 	/* user can change the params on its lock when it converts it, or
 	   add an lvb that didn't exist before */
 
-	ua = (struct dlm_user_args *)lkb->lkb_astparam;
+	ua = lkb->lkb_ua;
 
 	if (flags & DLM_LKF_VALBLK && !ua->lksb.sb_lvbptr) {
 		ua->lksb.sb_lvbptr = kzalloc(DLM_USER_LVB_LEN, GFP_KERNEL);
@@ -4525,7 +4554,7 @@ int dlm_user_convert(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
 	ua->old_mode = lkb->lkb_grmode;
 
 	error = set_lock_args(mode, &ua->lksb, flags, 0, timeout_cs,
-			      DLM_FAKE_USER_AST, ua, DLM_FAKE_USER_AST, &args);
+			      fake_astfn, ua, fake_bastfn, &args);
 	if (error)
 		goto out_put;
 
@@ -4555,7 +4584,7 @@ int dlm_user_unlock(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
 	if (error)
 		goto out;
 
-	ua = (struct dlm_user_args *)lkb->lkb_astparam;
+	ua = lkb->lkb_ua;
 
 	if (lvb_in && ua->lksb.sb_lvbptr)
 		memcpy(ua->lksb.sb_lvbptr, lvb_in, DLM_USER_LVB_LEN);
@@ -4604,7 +4633,7 @@ int dlm_user_cancel(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
 	if (error)
 		goto out;
 
-	ua = (struct dlm_user_args *)lkb->lkb_astparam;
+	ua = lkb->lkb_ua;
 	if (ua_tmp->castparam)
 		ua->castparam = ua_tmp->castparam;
 	ua->user_lksb = ua_tmp->user_lksb;
@@ -4642,7 +4671,7 @@ int dlm_user_deadlock(struct dlm_ls *ls, uint32_t flags, uint32_t lkid)
 	if (error)
 		goto out;
 
-	ua = (struct dlm_user_args *)lkb->lkb_astparam;
+	ua = lkb->lkb_ua;
 
 	error = set_unlock_args(flags, ua, &args);
 	if (error)
@@ -4681,7 +4710,6 @@ int dlm_user_deadlock(struct dlm_ls *ls, uint32_t flags, uint32_t lkid)
 
 static int orphan_proc_lock(struct dlm_ls *ls, struct dlm_lkb *lkb)
 {
-	struct dlm_user_args *ua = (struct dlm_user_args *)lkb->lkb_astparam;
 	struct dlm_args args;
 	int error;
 
@@ -4690,7 +4718,7 @@ static int orphan_proc_lock(struct dlm_ls *ls, struct dlm_lkb *lkb)
 	list_add_tail(&lkb->lkb_ownqueue, &ls->ls_orphans);
 	mutex_unlock(&ls->ls_orphans_mutex);
 
-	set_unlock_args(0, ua, &args);
+	set_unlock_args(0, lkb->lkb_ua, &args);
 
 	error = cancel_lock(ls, lkb, &args);
 	if (error == -DLM_ECANCEL)
@@ -4703,11 +4731,10 @@ static int orphan_proc_lock(struct dlm_ls *ls, struct dlm_lkb *lkb)
 
 static int unlock_proc_lock(struct dlm_ls *ls, struct dlm_lkb *lkb)
 {
-	struct dlm_user_args *ua = (struct dlm_user_args *)lkb->lkb_astparam;
 	struct dlm_args args;
 	int error;
 
-	set_unlock_args(DLM_LKF_FORCEUNLOCK, ua, &args);
+	set_unlock_args(DLM_LKF_FORCEUNLOCK, lkb->lkb_ua, &args);
 
 	error = unlock_lock(ls, lkb, &args);
 	if (error == -DLM_EUNLOCK)
diff --git a/fs/dlm/lock.h b/fs/dlm/lock.h
index 27b6ed3..05d9c82 100644
--- a/fs/dlm/lock.h
+++ b/fs/dlm/lock.h
@@ -17,7 +17,7 @@ void dlm_print_rsb(struct dlm_rsb *r);
 void dlm_dump_rsb(struct dlm_rsb *r);
 void dlm_print_lkb(struct dlm_lkb *lkb);
 void dlm_receive_message_saved(struct dlm_ls *ls, struct dlm_message *ms);
-void dlm_receive_buffer(struct dlm_header *hd, int nodeid);
+void dlm_receive_buffer(union dlm_packet *p, int nodeid);
 int dlm_modes_compat(int mode1, int mode2);
 void dlm_put_rsb(struct dlm_rsb *r);
 void dlm_hold_rsb(struct dlm_rsb *r);
diff --git a/fs/dlm/lockspace.c b/fs/dlm/lockspace.c
index b180fdc..b64e55e 100644
--- a/fs/dlm/lockspace.c
+++ b/fs/dlm/lockspace.c
@@ -191,7 +191,7 @@ static int do_uevent(struct dlm_ls *ls, int in)
 }
 
 
-int dlm_lockspace_init(void)
+int __init dlm_lockspace_init(void)
 {
 	ls_count = 0;
 	mutex_init(&ls_lock);
diff --git a/fs/dlm/memory.c b/fs/dlm/memory.c
index f778386..54c14c6 100644
--- a/fs/dlm/memory.c
+++ b/fs/dlm/memory.c
@@ -18,7 +18,7 @@
 static struct kmem_cache *lkb_cache;
 
 
-int dlm_memory_init(void)
+int __init dlm_memory_init(void)
 {
 	int ret = 0;
 
@@ -80,7 +80,7 @@ void dlm_free_lkb(struct dlm_lkb *lkb)
 {
 	if (lkb->lkb_flags & DLM_IFL_USER) {
 		struct dlm_user_args *ua;
-		ua = (struct dlm_user_args *)lkb->lkb_astparam;
+		ua = lkb->lkb_ua;
 		if (ua) {
 			if (ua->lksb.sb_lvbptr)
 				kfree(ua->lksb.sb_lvbptr);
diff --git a/fs/dlm/midcomms.c b/fs/dlm/midcomms.c
index e69926e..07ac709 100644
--- a/fs/dlm/midcomms.c
+++ b/fs/dlm/midcomms.c
@@ -61,9 +61,9 @@ int dlm_process_incoming_buffer(int nodeid, const void *base,
 	union {
 		unsigned char __buf[DLM_INBUF_LEN];
 		/* this is to force proper alignment on some arches */
-		struct dlm_header dlm;
+		union dlm_packet p;
 	} __tmp;
-	struct dlm_header *msg = &__tmp.dlm;
+	union dlm_packet *p = &__tmp.p;
 	int ret = 0;
 	int err = 0;
 	uint16_t msglen;
@@ -75,15 +75,22 @@ int dlm_process_incoming_buffer(int nodeid, const void *base,
 		   message may wrap around the end of the buffer back to the
 		   start, so we need to use a temp buffer and copy_from_cb. */
 
-		copy_from_cb(msg, base, offset, sizeof(struct dlm_header),
+		copy_from_cb(p, base, offset, sizeof(struct dlm_header),
 			     limit);
 
-		msglen = le16_to_cpu(msg->h_length);
-		lockspace = msg->h_lockspace;
+		msglen = le16_to_cpu(p->header.h_length);
+		lockspace = p->header.h_lockspace;
 
 		err = -EINVAL;
 		if (msglen < sizeof(struct dlm_header))
 			break;
+		if (p->header.h_cmd == DLM_MSG) {
+			if (msglen < sizeof(struct dlm_message))
+				break;
+		} else {
+			if (msglen < sizeof(struct dlm_rcom))
+				break;
+		}
 		err = -E2BIG;
 		if (msglen > dlm_config.ci_buffer_size) {
 			log_print("message size %d from %d too big, buf len %d",
@@ -104,26 +111,26 @@ int dlm_process_incoming_buffer(int nodeid, const void *base,
 		   in the buffer on the stack (which should work for most
 		   ordinary messages). */
 
-		if (msglen > DLM_INBUF_LEN && msg == &__tmp.dlm) {
-			msg = kmalloc(dlm_config.ci_buffer_size, GFP_KERNEL);
-			if (msg == NULL)
+		if (msglen > sizeof(__tmp) && p == &__tmp.p) {
+			p = kmalloc(dlm_config.ci_buffer_size, GFP_KERNEL);
+			if (p == NULL)
 				return ret;
 		}
 
-		copy_from_cb(msg, base, offset, msglen, limit);
+		copy_from_cb(p, base, offset, msglen, limit);
 
-		BUG_ON(lockspace != msg->h_lockspace);
+		BUG_ON(lockspace != p->header.h_lockspace);
 
 		ret += msglen;
 		offset += msglen;
 		offset &= (limit - 1);
 		len -= msglen;
 
-		dlm_receive_buffer(msg, nodeid);
+		dlm_receive_buffer(p, nodeid);
 	}
 
-	if (msg != &__tmp.dlm)
-		kfree(msg);
+	if (p != &__tmp.p)
+		kfree(p);
 
 	return err ? err : ret;
 }
diff --git a/fs/dlm/netlink.c b/fs/dlm/netlink.c
index 863b87d..7145936 100644
--- a/fs/dlm/netlink.c
+++ b/fs/dlm/netlink.c
@@ -78,7 +78,7 @@ static struct genl_ops dlm_nl_ops = {
 	.doit		= user_cmd,
 };
 
-int dlm_netlink_init(void)
+int __init dlm_netlink_init(void)
 {
 	int rv;
 
@@ -95,7 +95,7 @@ int dlm_netlink_init(void)
 	return rv;
 }
 
-void dlm_netlink_exit(void)
+void __exit dlm_netlink_exit(void)
 {
 	genl_unregister_ops(&family, &dlm_nl_ops);
 	genl_unregister_family(&family);
@@ -104,7 +104,6 @@ void dlm_netlink_exit(void)
 static void fill_data(struct dlm_lock_data *data, struct dlm_lkb *lkb)
 {
 	struct dlm_rsb *r = lkb->lkb_resource;
-	struct dlm_user_args *ua = (struct dlm_user_args *) lkb->lkb_astparam;
 
 	memset(data, 0, sizeof(struct dlm_lock_data));
 
@@ -117,8 +116,8 @@ static void fill_data(struct dlm_lock_data *data, struct dlm_lkb *lkb)
 	data->grmode = lkb->lkb_grmode;
 	data->rqmode = lkb->lkb_rqmode;
 	data->timestamp = lkb->lkb_timestamp;
-	if (ua)
-		data->xid = ua->xid;
+	if (lkb->lkb_ua)
+		data->xid = lkb->lkb_ua->xid;
 	if (r) {
 		data->lockspace_id = r->res_ls->ls_global_id;
 		data->resource_namelen = r->res_length;
diff --git a/fs/dlm/rcom.c b/fs/dlm/rcom.c
index 026824c..035e6f9 100644
--- a/fs/dlm/rcom.c
+++ b/fs/dlm/rcom.c
@@ -78,13 +78,14 @@ static void send_rcom(struct dlm_ls *ls, struct dlm_mhandle *mh,
 
 static void make_config(struct dlm_ls *ls, struct rcom_config *rf)
 {
-	rf->rf_lvblen = ls->ls_lvblen;
-	rf->rf_lsflags = ls->ls_exflags;
+	rf->rf_lvblen = cpu_to_le32(ls->ls_lvblen);
+	rf->rf_lsflags = cpu_to_le32(ls->ls_exflags);
 }
 
 static int check_config(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
 {
 	struct rcom_config *rf = (struct rcom_config *) rc->rc_buf;
+	size_t conf_size = sizeof(struct dlm_rcom) + sizeof(struct rcom_config);
 
 	if ((rc->rc_header.h_version & 0xFFFF0000) != DLM_HEADER_MAJOR) {
 		log_error(ls, "version mismatch: %x nodeid %d: %x",
@@ -93,11 +94,18 @@ static int check_config(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
 		return -EPROTO;
 	}
 
-	if (rf->rf_lvblen != ls->ls_lvblen ||
-	    rf->rf_lsflags != ls->ls_exflags) {
+	if (rc->rc_header.h_length < conf_size) {
+		log_error(ls, "config too short: %d nodeid %d",
+			  rc->rc_header.h_length, nodeid);
+		return -EPROTO;
+	}
+
+	if (le32_to_cpu(rf->rf_lvblen) != ls->ls_lvblen ||
+	    le32_to_cpu(rf->rf_lsflags) != ls->ls_exflags) {
 		log_error(ls, "config mismatch: %d,%x nodeid %d: %d,%x",
-			  ls->ls_lvblen, ls->ls_exflags,
-			  nodeid, rf->rf_lvblen, rf->rf_lsflags);
+			  ls->ls_lvblen, ls->ls_exflags, nodeid,
+			  le32_to_cpu(rf->rf_lvblen),
+			  le32_to_cpu(rf->rf_lsflags));
 		return -EPROTO;
 	}
 	return 0;
@@ -128,7 +136,7 @@ int dlm_rcom_status(struct dlm_ls *ls, int nodeid)
 	ls->ls_recover_nodeid = nodeid;
 
 	if (nodeid == dlm_our_nodeid()) {
-		rc = (struct dlm_rcom *) ls->ls_recover_buf;
+		rc = ls->ls_recover_buf;
 		rc->rc_result = dlm_recover_status(ls);
 		goto out;
 	}
@@ -147,7 +155,7 @@ int dlm_rcom_status(struct dlm_ls *ls, int nodeid)
 	if (error)
 		goto out;
 
-	rc = (struct dlm_rcom *) ls->ls_recover_buf;
+	rc = ls->ls_recover_buf;
 
 	if (rc->rc_result == -ESRCH) {
 		/* we pretend the remote lockspace exists with 0 status */
@@ -201,14 +209,15 @@ int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name, int last_len)
 {
 	struct dlm_rcom *rc;
 	struct dlm_mhandle *mh;
-	int error = 0, len = sizeof(struct dlm_rcom);
+	int error = 0;
+	int max_size = dlm_config.ci_buffer_size - sizeof(struct dlm_rcom);
 
 	ls->ls_recover_nodeid = nodeid;
 
 	if (nodeid == dlm_our_nodeid()) {
 		dlm_copy_master_names(ls, last_name, last_len,
-		                      ls->ls_recover_buf + len,
-		                      dlm_config.ci_buffer_size - len, nodeid);
+		                      ls->ls_recover_buf->rc_buf,
+		                      max_size, nodeid);
 		goto out;
 	}
 
@@ -299,22 +308,22 @@ static void pack_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb,
 {
 	memset(rl, 0, sizeof(*rl));
 
-	rl->rl_ownpid = lkb->lkb_ownpid;
-	rl->rl_lkid = lkb->lkb_id;
-	rl->rl_exflags = lkb->lkb_exflags;
-	rl->rl_flags = lkb->lkb_flags;
-	rl->rl_lvbseq = lkb->lkb_lvbseq;
+	rl->rl_ownpid = cpu_to_le32(lkb->lkb_ownpid);
+	rl->rl_lkid = cpu_to_le32(lkb->lkb_id);
+	rl->rl_exflags = cpu_to_le32(lkb->lkb_exflags);
+	rl->rl_flags = cpu_to_le32(lkb->lkb_flags);
+	rl->rl_lvbseq = cpu_to_le32(lkb->lkb_lvbseq);
 	rl->rl_rqmode = lkb->lkb_rqmode;
 	rl->rl_grmode = lkb->lkb_grmode;
 	rl->rl_status = lkb->lkb_status;
-	rl->rl_wait_type = lkb->lkb_wait_type;
+	rl->rl_wait_type = cpu_to_le16(lkb->lkb_wait_type);
 
-	if (lkb->lkb_bastaddr)
+	if (lkb->lkb_bastfn)
 		rl->rl_asts |= AST_BAST;
-	if (lkb->lkb_astaddr)
+	if (lkb->lkb_astfn)
 		rl->rl_asts |= AST_COMP;
 
-	rl->rl_namelen = r->res_length;
+	rl->rl_namelen = cpu_to_le16(r->res_length);
 	memcpy(rl->rl_name, r->res_name, r->res_length);
 
 	/* FIXME: might we have an lvb without DLM_LKF_VALBLK set ?
@@ -348,6 +357,7 @@ int dlm_send_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
 	return error;
 }
 
+/* needs at least dlm_rcom + rcom_lock */
 static void receive_rcom_lock(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 {
 	struct dlm_rcom *rc;
@@ -401,7 +411,7 @@ int dlm_send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in)
 	rc->rc_result = -ESRCH;
 
 	rf = (struct rcom_config *) rc->rc_buf;
-	rf->rf_lvblen = -1;
+	rf->rf_lvblen = cpu_to_le32(~0U);
 
 	dlm_rcom_out(rc);
 	dlm_lowcomms_commit_buffer(mh);
@@ -439,6 +449,8 @@ static int is_old_reply(struct dlm_ls *ls, struct dlm_rcom *rc)
 
 void dlm_receive_rcom(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
 {
+	int lock_size = sizeof(struct dlm_rcom) + sizeof(struct rcom_lock);
+
 	if (dlm_recovery_stopped(ls) && (rc->rc_type != DLM_RCOM_STATUS)) {
 		log_debug(ls, "ignoring recovery message %x from %d",
 			  rc->rc_type, nodeid);
@@ -462,6 +474,8 @@ void dlm_receive_rcom(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
 		break;
 
 	case DLM_RCOM_LOCK:
+		if (rc->rc_header.h_length < lock_size)
+			goto Eshort;
 		receive_rcom_lock(ls, rc);
 		break;
 
@@ -478,13 +492,18 @@ void dlm_receive_rcom(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
 		break;
 
 	case DLM_RCOM_LOCK_REPLY:
+		if (rc->rc_header.h_length < lock_size)
+			goto Eshort;
 		dlm_recover_process_copy(ls, rc);
 		break;
 
 	default:
 		log_error(ls, "receive_rcom bad type %d", rc->rc_type);
 	}
- out:
+out:
 	return;
+Eshort:
+	log_error(ls, "recovery message %x from %d is too short",
+			  rc->rc_type, nodeid);
 }
 
diff --git a/fs/dlm/recover.c b/fs/dlm/recover.c
index df075dc..80aba5b 100644
--- a/fs/dlm/recover.c
+++ b/fs/dlm/recover.c
@@ -94,7 +94,7 @@ void dlm_set_recover_status(struct dlm_ls *ls, uint32_t status)
 
 static int wait_status_all(struct dlm_ls *ls, uint32_t wait_status)
 {
-	struct dlm_rcom *rc = (struct dlm_rcom *) ls->ls_recover_buf;
+	struct dlm_rcom *rc = ls->ls_recover_buf;
 	struct dlm_member *memb;
 	int error = 0, delay;
 
@@ -123,7 +123,7 @@ static int wait_status_all(struct dlm_ls *ls, uint32_t wait_status)
 
 static int wait_status_low(struct dlm_ls *ls, uint32_t wait_status)
 {
-	struct dlm_rcom *rc = (struct dlm_rcom *) ls->ls_recover_buf;
+	struct dlm_rcom *rc = ls->ls_recover_buf;
 	int error = 0, delay = 0, nodeid = ls->ls_low_nodeid;
 
 	for (;;) {
diff --git a/fs/dlm/requestqueue.c b/fs/dlm/requestqueue.c
index 0de04f1..daa4183 100644
--- a/fs/dlm/requestqueue.c
+++ b/fs/dlm/requestqueue.c
@@ -20,7 +20,7 @@
 struct rq_entry {
 	struct list_head list;
 	int nodeid;
-	char request[0];
+	struct dlm_message request;
 };
 
 /*
@@ -30,10 +30,10 @@ struct rq_entry {
  * lockspace is enabled on some while still suspended on others.
  */
 
-void dlm_add_requestqueue(struct dlm_ls *ls, int nodeid, struct dlm_header *hd)
+void dlm_add_requestqueue(struct dlm_ls *ls, int nodeid, struct dlm_message *ms)
 {
 	struct rq_entry *e;
-	int length = hd->h_length;
+	int length = ms->m_header.h_length - sizeof(struct dlm_message);
 
 	e = kmalloc(sizeof(struct rq_entry) + length, GFP_KERNEL);
 	if (!e) {
@@ -42,7 +42,7 @@ void dlm_add_requestqueue(struct dlm_ls *ls, int nodeid, struct dlm_header *hd)
 	}
 
 	e->nodeid = nodeid;
-	memcpy(e->request, hd, length);
+	memcpy(&e->request, ms, ms->m_header.h_length);
 
 	mutex_lock(&ls->ls_requestqueue_mutex);
 	list_add_tail(&e->list, &ls->ls_requestqueue);
@@ -76,7 +76,7 @@ int dlm_process_requestqueue(struct dlm_ls *ls)
 		e = list_entry(ls->ls_requestqueue.next, struct rq_entry, list);
 		mutex_unlock(&ls->ls_requestqueue_mutex);
 
-		dlm_receive_message_saved(ls, (struct dlm_message *)e->request);
+		dlm_receive_message_saved(ls, &e->request);
 
 		mutex_lock(&ls->ls_requestqueue_mutex);
 		list_del(&e->list);
@@ -176,7 +176,7 @@ void dlm_purge_requestqueue(struct dlm_ls *ls)
 
 	mutex_lock(&ls->ls_requestqueue_mutex);
 	list_for_each_entry_safe(e, safe, &ls->ls_requestqueue, list) {
-		ms = (struct dlm_message *) e->request;
+		ms =  &e->request;
 
 		if (purge_request(ls, ms, e->nodeid)) {
 			list_del(&e->list);
diff --git a/fs/dlm/requestqueue.h b/fs/dlm/requestqueue.h
index aba34fc..10ce449 100644
--- a/fs/dlm/requestqueue.h
+++ b/fs/dlm/requestqueue.h
@@ -13,7 +13,7 @@
 #ifndef __REQUESTQUEUE_DOT_H__
 #define __REQUESTQUEUE_DOT_H__
 
-void dlm_add_requestqueue(struct dlm_ls *ls, int nodeid, struct dlm_header *hd);
+void dlm_add_requestqueue(struct dlm_ls *ls, int nodeid, struct dlm_message *ms);
 int dlm_process_requestqueue(struct dlm_ls *ls);
 void dlm_wait_requestqueue(struct dlm_ls *ls);
 void dlm_purge_requestqueue(struct dlm_ls *ls);
diff --git a/fs/dlm/user.c b/fs/dlm/user.c
index 7cbc682..ebbcf38 100644
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -82,7 +82,7 @@ struct dlm_lock_result32 {
 
 static void compat_input(struct dlm_write_request *kb,
 			 struct dlm_write_request32 *kb32,
-			 int max_namelen)
+			 size_t count)
 {
 	kb->version[0] = kb32->version[0];
 	kb->version[1] = kb32->version[1];
@@ -94,7 +94,8 @@ static void compat_input(struct dlm_write_request *kb,
 	    kb->cmd == DLM_USER_REMOVE_LOCKSPACE) {
 		kb->i.lspace.flags = kb32->i.lspace.flags;
 		kb->i.lspace.minor = kb32->i.lspace.minor;
-		strcpy(kb->i.lspace.name, kb32->i.lspace.name);
+		memcpy(kb->i.lspace.name, kb32->i.lspace.name, count -
+			offsetof(struct dlm_write_request32, i.lspace.name));
 	} else if (kb->cmd == DLM_USER_PURGE) {
 		kb->i.purge.nodeid = kb32->i.purge.nodeid;
 		kb->i.purge.pid = kb32->i.purge.pid;
@@ -112,11 +113,8 @@ static void compat_input(struct dlm_write_request *kb,
 		kb->i.lock.bastaddr = (void *)(long)kb32->i.lock.bastaddr;
 		kb->i.lock.lksb = (void *)(long)kb32->i.lock.lksb;
 		memcpy(kb->i.lock.lvb, kb32->i.lock.lvb, DLM_USER_LVB_LEN);
-		if (kb->i.lock.namelen <= max_namelen)
-			memcpy(kb->i.lock.name, kb32->i.lock.name,
-			       kb->i.lock.namelen);
-		else
-			kb->i.lock.namelen = max_namelen;
+		memcpy(kb->i.lock.name, kb32->i.lock.name, count -
+			offsetof(struct dlm_write_request32, i.lock.name));
 	}
 }
 
@@ -197,8 +195,8 @@ void dlm_user_add_ast(struct dlm_lkb *lkb, int type)
 	if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD))
 		goto out;
 
-	DLM_ASSERT(lkb->lkb_astparam, dlm_print_lkb(lkb););
-	ua = (struct dlm_user_args *)lkb->lkb_astparam;
+	DLM_ASSERT(lkb->lkb_ua, dlm_print_lkb(lkb););
+	ua = lkb->lkb_ua;
 	proc = ua->proc;
 
 	if (type == AST_BAST && ua->bastaddr == NULL)
@@ -508,7 +506,7 @@ static ssize_t device_write(struct file *file, const char __user *buf,
 #endif
 		return -EINVAL;
 
-	kbuf = kmalloc(count, GFP_KERNEL);
+	kbuf = kzalloc(count + 1, GFP_KERNEL);
 	if (!kbuf)
 		return -ENOMEM;
 
@@ -526,15 +524,14 @@ static ssize_t device_write(struct file *file, const char __user *buf,
 	if (!kbuf->is64bit) {
 		struct dlm_write_request32 *k32buf;
 		k32buf = (struct dlm_write_request32 *)kbuf;
-		kbuf = kmalloc(count + (sizeof(struct dlm_write_request) -
+		kbuf = kmalloc(count + 1 + (sizeof(struct dlm_write_request) -
 			       sizeof(struct dlm_write_request32)), GFP_KERNEL);
 		if (!kbuf)
 			return -ENOMEM;
 
 		if (proc)
 			set_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags);
-		compat_input(kbuf, k32buf,
-			     count - sizeof(struct dlm_write_request32));
+		compat_input(kbuf, k32buf, count + 1);
 		kfree(k32buf);
 	}
 #endif
@@ -774,7 +771,6 @@ static ssize_t device_read(struct file *file, char __user *buf, size_t count,
 {
 	struct dlm_user_proc *proc = file->private_data;
 	struct dlm_lkb *lkb;
-	struct dlm_user_args *ua;
 	DECLARE_WAITQUEUE(wait, current);
 	int error, type=0, bmode=0, removed = 0;
 
@@ -845,8 +841,7 @@ static ssize_t device_read(struct file *file, char __user *buf, size_t count,
 	}
 	spin_unlock(&proc->asts_spin);
 
-	ua = (struct dlm_user_args *)lkb->lkb_astparam;
-	error = copy_result_to_user(ua,
+	error = copy_result_to_user(lkb->lkb_ua,
 			 	test_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags),
 				type, bmode, buf, count);
 
@@ -907,7 +902,7 @@ static struct miscdevice ctl_device = {
 	.minor = MISC_DYNAMIC_MINOR,
 };
 
-int dlm_user_init(void)
+int __init dlm_user_init(void)
 {
 	int error;
 
diff --git a/fs/dlm/util.c b/fs/dlm/util.c
index 4d9c1f4..e36520a 100644
--- a/fs/dlm/util.c
+++ b/fs/dlm/util.c
@@ -131,52 +131,8 @@ void dlm_message_in(struct dlm_message *ms)
 	ms->m_result		= from_dlm_errno(le32_to_cpu(ms->m_result));
 }
 
-static void rcom_lock_out(struct rcom_lock *rl)
-{
-	rl->rl_ownpid		= cpu_to_le32(rl->rl_ownpid);
-	rl->rl_lkid		= cpu_to_le32(rl->rl_lkid);
-	rl->rl_remid		= cpu_to_le32(rl->rl_remid);
-	rl->rl_parent_lkid	= cpu_to_le32(rl->rl_parent_lkid);
-	rl->rl_parent_remid	= cpu_to_le32(rl->rl_parent_remid);
-	rl->rl_exflags		= cpu_to_le32(rl->rl_exflags);
-	rl->rl_flags		= cpu_to_le32(rl->rl_flags);
-	rl->rl_lvbseq		= cpu_to_le32(rl->rl_lvbseq);
-	rl->rl_result		= cpu_to_le32(rl->rl_result);
-	rl->rl_wait_type	= cpu_to_le16(rl->rl_wait_type);
-	rl->rl_namelen		= cpu_to_le16(rl->rl_namelen);
-}
-
-static void rcom_lock_in(struct rcom_lock *rl)
-{
-	rl->rl_ownpid		= le32_to_cpu(rl->rl_ownpid);
-	rl->rl_lkid		= le32_to_cpu(rl->rl_lkid);
-	rl->rl_remid		= le32_to_cpu(rl->rl_remid);
-	rl->rl_parent_lkid	= le32_to_cpu(rl->rl_parent_lkid);
-	rl->rl_parent_remid	= le32_to_cpu(rl->rl_parent_remid);
-	rl->rl_exflags		= le32_to_cpu(rl->rl_exflags);
-	rl->rl_flags		= le32_to_cpu(rl->rl_flags);
-	rl->rl_lvbseq		= le32_to_cpu(rl->rl_lvbseq);
-	rl->rl_result		= le32_to_cpu(rl->rl_result);
-	rl->rl_wait_type	= le16_to_cpu(rl->rl_wait_type);
-	rl->rl_namelen		= le16_to_cpu(rl->rl_namelen);
-}
-
-static void rcom_config_out(struct rcom_config *rf)
-{
-	rf->rf_lvblen		= cpu_to_le32(rf->rf_lvblen);
-	rf->rf_lsflags		= cpu_to_le32(rf->rf_lsflags);
-}
-
-static void rcom_config_in(struct rcom_config *rf)
-{
-	rf->rf_lvblen		= le32_to_cpu(rf->rf_lvblen);
-	rf->rf_lsflags		= le32_to_cpu(rf->rf_lsflags);
-}
-
 void dlm_rcom_out(struct dlm_rcom *rc)
 {
-	int type = rc->rc_type;
-
 	header_out(&rc->rc_header);
 
 	rc->rc_type		= cpu_to_le32(rc->rc_type);
@@ -184,18 +140,10 @@ void dlm_rcom_out(struct dlm_rcom *rc)
 	rc->rc_id		= cpu_to_le64(rc->rc_id);
 	rc->rc_seq		= cpu_to_le64(rc->rc_seq);
 	rc->rc_seq_reply	= cpu_to_le64(rc->rc_seq_reply);
-
-	if ((type == DLM_RCOM_LOCK) || (type == DLM_RCOM_LOCK_REPLY))
-		rcom_lock_out((struct rcom_lock *) rc->rc_buf);
-
-	else if (type == DLM_RCOM_STATUS_REPLY)
-		rcom_config_out((struct rcom_config *) rc->rc_buf);
 }
 
 void dlm_rcom_in(struct dlm_rcom *rc)
 {
-	int type;
-
 	header_in(&rc->rc_header);
 
 	rc->rc_type		= le32_to_cpu(rc->rc_type);
@@ -203,13 +151,4 @@ void dlm_rcom_in(struct dlm_rcom *rc)
 	rc->rc_id		= le64_to_cpu(rc->rc_id);
 	rc->rc_seq		= le64_to_cpu(rc->rc_seq);
 	rc->rc_seq_reply	= le64_to_cpu(rc->rc_seq_reply);
-
-	type = rc->rc_type;
-
-	if ((type == DLM_RCOM_LOCK) || (type == DLM_RCOM_LOCK_REPLY))
-		rcom_lock_in((struct rcom_lock *) rc->rc_buf);
-
-	else if (type == DLM_RCOM_STATUS_REPLY)
-		rcom_config_in((struct rcom_config *) rc->rc_buf);
 }
-