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: (21 commits)
  dlm: static initialization improvements
  dlm: clean ups
  dlm: Sanity check namelen before copying it
  dlm: keep cached master rsbs during recovery
  dlm: change error message to debug
  dlm: fix possible use-after-free
  dlm: limit dir lookup loop
  dlm: reject normal unlock when lock is waiting for lookup
  dlm: validate messages before processing
  dlm: reject messages from non-members
  dlm: another call to confirm_master in receive_request_reply
  dlm: recover locks waiting for overlap replies
  dlm: clear ast_type when removing from astqueue
  dlm: use fixed errno values in messages
  dlm: swap bytes for rcom lock reply
  dlm: align midcomms message buffer
  dlm: close othercons
  dlm: use dlm prefix on alloc and free functions
  dlm: don't print common non-errors
  dlm: proper prototypes
  ...

1 files changed, 37 insertions, 39 deletions

diff --git a/fs/dlm/dir.c b/fs/dlm/dir.c
index 46754553fdc..ff97ba92433 100644
--- a/fs/dlm/dir.c
+++ b/fs/dlm/dir.c
@@ -49,7 +49,7 @@ static struct dlm_direntry *get_free_de(struct dlm_ls *ls, int len)
 	spin_unlock(&ls->ls_recover_list_lock);
 
 	if (!found)
-		de = allocate_direntry(ls, len);
+		de = kzalloc(sizeof(struct dlm_direntry) + len, GFP_KERNEL);
 	return de;
 }
 
@@ -62,7 +62,7 @@ void dlm_clear_free_entries(struct dlm_ls *ls)
 		de = list_entry(ls->ls_recover_list.next, struct dlm_direntry,
 				list);
 		list_del(&de->list);
-		free_direntry(de);
+		kfree(de);
 	}
 	spin_unlock(&ls->ls_recover_list_lock);
 }
@@ -171,7 +171,7 @@ void dlm_dir_remove_entry(struct dlm_ls *ls, int nodeid, char *name, int namelen
 	}
 
 	list_del(&de->list);
-	free_direntry(de);
+	kfree(de);
  out:
 	write_unlock(&ls->ls_dirtbl[bucket].lock);
 }
@@ -302,7 +302,7 @@ static int get_entry(struct dlm_ls *ls, int nodeid, char *name,
 
 	write_unlock(&ls->ls_dirtbl[bucket].lock);
 
-	de = allocate_direntry(ls, namelen);
+	de = kzalloc(sizeof(struct dlm_direntry) + namelen, GFP_KERNEL);
 	if (!de)
 		return -ENOMEM;
 
@@ -313,7 +313,7 @@ static int get_entry(struct dlm_ls *ls, int nodeid, char *name,
 	write_lock(&ls->ls_dirtbl[bucket].lock);
 	tmp = search_bucket(ls, name, namelen, bucket);
 	if (tmp) {
-		free_direntry(de);
+		kfree(de);
 		de = tmp;
 	} else {
 		list_add_tail(&de->list, &ls->ls_dirtbl[bucket].list);
@@ -329,49 +329,47 @@ int dlm_dir_lookup(struct dlm_ls *ls, int nodeid, char *name, int namelen,
 	return get_entry(ls, nodeid, name, namelen, r_nodeid);
 }
 
-/* Copy the names of master rsb's into the buffer provided.
-   Only select names whose dir node is the given nodeid. */
+static struct dlm_rsb *find_rsb_root(struct dlm_ls *ls, char *name, int len)
+{
+	struct dlm_rsb *r;
+
+	down_read(&ls->ls_root_sem);
+	list_for_each_entry(r, &ls->ls_root_list, res_root_list) {
+		if (len == r->res_length && !memcmp(name, r->res_name, len)) {
+			up_read(&ls->ls_root_sem);
+			return r;
+		}
+	}
+	up_read(&ls->ls_root_sem);
+	return NULL;
+}
+
+/* Find the rsb where we left off (or start again), then send rsb names
+   for rsb's we're master of and whose directory node matches the requesting
+   node.  inbuf is the rsb name last sent, inlen is the name's length */
 
 void dlm_copy_master_names(struct dlm_ls *ls, char *inbuf, int inlen,
  			   char *outbuf, int outlen, int nodeid)
 {
 	struct list_head *list;
-	struct dlm_rsb *start_r = NULL, *r = NULL;
-	int offset = 0, start_namelen, error, dir_nodeid;
-	char *start_name;
+	struct dlm_rsb *r;
+	int offset = 0, dir_nodeid;
 	uint16_t be_namelen;
 
-	/*
-	 * Find the rsb where we left off (or start again)
-	 */
-
-	start_namelen = inlen;
-	start_name = inbuf;
-
-	if (start_namelen > 1) {
-		/*
-		 * We could also use a find_rsb_root() function here that
-		 * searched the ls_root_list.
-		 */
-		error = dlm_find_rsb(ls, start_name, start_namelen, R_MASTER,
-				     &start_r);
-		DLM_ASSERT(!error && start_r,
-			   printk("error %d\n", error););
-		DLM_ASSERT(!list_empty(&start_r->res_root_list),
-			   dlm_print_rsb(start_r););
-		dlm_put_rsb(start_r);
-	}
-
-	/*
-	 * Send rsb names for rsb's we're master of and whose directory node
-	 * matches the requesting node.
-	 */
-
 	down_read(&ls->ls_root_sem);
-	if (start_r)
-		list = start_r->res_root_list.next;
-	else
+
+	if (inlen > 1) {
+		r = find_rsb_root(ls, inbuf, inlen);
+		if (!r) {
+			inbuf[inlen - 1] = '\0';
+			log_error(ls, "copy_master_names from %d start %d %s",
+				  nodeid, inlen, inbuf);
+			goto out;
+		}
+		list = r->res_root_list.next;
+	} else {
 		list = ls->ls_root_list.next;
+	}
 
 	for (offset = 0; list != &ls->ls_root_list; list = list->next) {
 		r = list_entry(list, struct dlm_rsb, res_root_list);