1 files changed, 138 insertions, 0 deletions
diff --git a/debian/patches/0002-libnetfs-add-netfs_make_node_alloc-to-allocate-fat-n.patch b/debian/patches/0002-libnetfs-add-netfs_make_node_alloc-to-allocate-fat-n.patch
new file mode 100644
index 00000000..959f7188
--- /dev/null
+++ b/debian/patches/0002-libnetfs-add-netfs_make_node_alloc-to-allocate-fat-n.patch
@@ -0,0 +1,138 @@
+From 94fecd72f41542c8dfa82bdf7b47742f8c29b321 Mon Sep 17 00:00:00 2001
+From: Justus Winter <4winter@informatik.uni-hamburg.de>
+Date: Sun, 18 May 2014 13:34:12 +0200
+Subject: [PATCH 02/11] libnetfs: add netfs_make_node_alloc to allocate fat
+ nodes
+
+libnetfs has two kind of nodes, struct node and struct netnode.
+struct node is used to store libnetfs specific data, while struct
+netnode contains user supplied data.  Previously, both objects were
+allocated separatly, and a pointer from the node to the netnode
+provided a mapping from the former to the latter.
+
+Provide a function netfs_make_node_alloc that allocates both nodes in
+a contiguous region.
+
+This reduces the memory allocation overhead when creating nodes.  It
+also makes the relation between node and netnode a simple offset
+calculation.  Provide two functions to compute the netnode address
+from the node address and vice-versa.
+
+Most notably, this makes implementing a cache on top of libnetfs
+easier.  Auxiliary data for the cache can be stored in the
+user-defined netnode, and the fat node can be used as the value.
+
+* libnetfs/make-node.c (init_node): Move initialization here.
+(netfs_make_node): Use init_node.
+(netfs_make_node_alloc): New function to allocate fat nodes.
+* libnetfs/netfs.h (netfs_make_node_alloc): New declaration.
+(_netfs_sizeof_struct_node): Likewise.
+(netfs_node_netnode): Compute netnode address from node address.
+(netfs_netnode_node): And vice-versa.
+* libnetfs/init-init.c (_netfs_sizeof_struct_node): New variable.
+---
+ libnetfs/init-init.c |  3 +++
+ libnetfs/make-node.c | 29 +++++++++++++++++++++++------
+ libnetfs/netfs.h     | 27 +++++++++++++++++++++++++++
+ 3 files changed, 53 insertions(+), 6 deletions(-)
+
+diff --git a/libnetfs/init-init.c b/libnetfs/init-init.c
+index e98b656..a088ad5 100644
+--- a/libnetfs/init-init.c
++++ b/libnetfs/init-init.c
+@@ -21,6 +21,9 @@
+ 
+ #include "netfs.h"
+ 
++/* For safe inlining of netfs_node_netnode and netfs_netnode_node.  */
++size_t const _netfs_sizeof_struct_node = sizeof (struct node);
++
+ pthread_spinlock_t netfs_node_refcnt_lock = PTHREAD_SPINLOCK_INITIALIZER;
+ 
+ struct node *netfs_root_node = 0;
+diff --git a/libnetfs/make-node.c b/libnetfs/make-node.c
+index f20ada1..6bd8109 100644
+--- a/libnetfs/make-node.c
++++ b/libnetfs/make-node.c
+@@ -21,13 +21,9 @@
+ #include "netfs.h"
+ #include <hurd/fshelp.h>
+ 
+-struct node *
+-netfs_make_node (struct netnode *nn)
++static struct node *
++init_node (struct node *np, struct netnode *nn)
+ {
+-  struct node *np = malloc (sizeof (struct node));
+-  if (! np)
+-    return NULL;
+-  
+   np->nn = nn;
+ 
+   pthread_mutex_init (&np->lock, NULL);
+@@ -40,3 +36,24 @@ netfs_make_node (struct netnode *nn)
+   
+   return np;
+ }
++
++struct node *
++netfs_make_node (struct netnode *nn)
++{
++  struct node *np = malloc (sizeof (struct node));
++  if (! np)
++    return NULL;
++
++  return init_node (np, nn);
++}
++
++struct node *
++netfs_make_node_alloc (size_t size)
++{
++  struct node *np = malloc (sizeof (struct node) + size);
++
++  if (np == NULL)
++    return NULL;
++
++  return init_node (np, netfs_node_netnode (np));
++}
+diff --git a/libnetfs/netfs.h b/libnetfs/netfs.h
+index aef4a3d..fbe2c60 100644
+--- a/libnetfs/netfs.h
++++ b/libnetfs/netfs.h
+@@ -372,6 +372,33 @@ extern int netfs_maxsymlinks;
+    If an error occurs, NULL is returned.  */
+ struct node *netfs_make_node (struct netnode *);
+ 
++/* Create a new node structure.  Also allocate SIZE bytes for the
++   netnode.  The address of the netnode can be obtained using
++   netfs_node_netnode.  The new node will have one hard reference and
++   no light references.  If an error occurs, NULL is returned.  */
++struct node *netfs_make_node_alloc (size_t size);
++
++/* To avoid breaking the ABI whenever sizeof (struct node) changes, we
++   explicitly provide the size.  The following two functions will use
++   this value for offset calculations.  */
++extern const size_t _netfs_sizeof_struct_node;
++
++/* Return the address of the netnode for NODE.  NODE must have been
++   allocated using netfs_make_node_alloc.  */
++static inline struct netnode *
++netfs_node_netnode (struct node *node)
++{
++  return (struct netnode *) ((char *) node + _netfs_sizeof_struct_node);
++}
++
++/* Return the address of the node for NETNODE.  NETNODE must have been
++   allocated using netfs_make_node_alloc.  */
++static inline struct node *
++netfs_netnode_node (struct netnode *netnode)
++{
++  return (struct node *) ((char *) netnode - _netfs_sizeof_struct_node);
++}
++
+ /* Whenever node->references is to be touched, this lock must be
+    held.  Cf. netfs_nrele, netfs_nput, netfs_nref and netfs_drop_node.  */
+ extern pthread_spinlock_t netfs_node_refcnt_lock;
+-- 
+2.0.0.rc2
+