9p: turn fid->dlist into hlist

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/9p/fid.c

@@ -54,12 +54,12 @@ int v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid)
 		if (!dent)
 			return -ENOMEM;
 
-		INIT_LIST_HEAD(&dent->fidlist);
+		INIT_HLIST_HEAD(&dent->fidlist);
 		dentry->d_fsdata = dent;
 	}
 
 	spin_lock(&dentry->d_lock);
-	list_add(&fid->dlist, &dent->fidlist);
+	hlist_add_head(&fid->dlist, &dent->fidlist);
 	spin_unlock(&dentry->d_lock);
 
 	return 0;
@@ -84,8 +84,9 @@ static struct p9_fid *v9fs_fid_find(struct dentry *dentry, kuid_t uid, int any)
 	dent = (struct v9fs_dentry *) dentry->d_fsdata;
 	ret = NULL;
 	if (dent) {
+		struct hlist_node *n;
 		spin_lock(&dentry->d_lock);
-		list_for_each_entry(fid, &dent->fidlist, dlist) {
+		hlist_for_each_entry(fid, n, &dent->fidlist, dlist) {
 			if (any || uid_eq(fid->uid, uid)) {
 				ret = fid;
 				break;

fs/9p/fid.h

@@ -40,7 +40,7 @@
  * Design and Implementation of the Linux 9P File System documentation
  */
 struct v9fs_dentry {
-	struct list_head fidlist;
+	struct hlist_head fidlist;
 };
 
 struct p9_fid *v9fs_fid_lookup(struct dentry *dentry);

fs/9p/vfs_dentry.c

@@ -84,16 +84,13 @@ static int v9fs_cached_dentry_delete(const struct dentry *dentry)
 static void v9fs_dentry_release(struct dentry *dentry)
 {
 	struct v9fs_dentry *dent;
-	struct p9_fid *temp, *current_fid;
-
 	p9_debug(P9_DEBUG_VFS, " dentry: %s (%p)\n",
 		 dentry->d_name.name, dentry);
 	dent = dentry->d_fsdata;
 	if (dent) {
-		list_for_each_entry_safe(current_fid, temp, &dent->fidlist,
-									dlist) {
-			p9_client_clunk(current_fid);
-		}
+		struct hlist_node *p, *n;
+		hlist_for_each_safe(p, n, &dent->fidlist)
+			p9_client_clunk(hlist_entry(p, struct p9_fid, dlist));
 
 		kfree(dent);
 		dentry->d_fsdata = NULL;

include/net/9p/client.h

@@ -192,7 +192,7 @@ struct p9_fid {
 	void *rdir;
 
 	struct list_head flist;
-	struct list_head dlist;	/* list of all fids attached to a dentry */
+	struct hlist_node dlist;	/* list of all fids attached to a dentry */
 };
 
 /**