Support inode defragmentation for sockets
Cc: netdev@vger.kernel.org

Reviewed-by: Rik van Riel <riel@redhat.com>

Signed-off-by: Christoph Lameter <clameter@sgi.com>

---

 net/socket.c |    8 ++++++++

 1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/net/socket.c b/net/socket.c

index 9d3fbfb..205f450 100644

--- a/net/socket.c

+++ b/net/socket.c

@@ -269,6 +269,12 @@ static void init_once(struct kmem_cache *cachep, void *foo)

 	inode_init_once(&ei->vfs_inode);

 }
+static void *sock_get_inodes(struct kmem_cache *s, int nr, void **v)

+{

+	return fs_get_inodes(s, nr, v,

+		offsetof(struct socket_alloc, vfs_inode));

+}

+

 static int init_inodecache(void)

 {

 	sock_inode_cachep = kmem_cache_create("sock_inode_cache",

@@ -280,6 +286,8 @@ static int init_inodecache(void)

 					      init_once);

 	if (sock_inode_cachep == NULL)

 		return -ENOMEM;

+	kmem_cache_setup_defrag(sock_inode_cachep,

+			sock_get_inodes, kick_inodes);

 	return 0;

 }
--

1.5.4.4
--

--

Hi Christoph.
Out of curiosity, how can you drop socket inode, since it is always

attached to socket which is removed automatically when connection is

closed. Any force of dropping socket inode can only result in connection

drop, i.e. there are no inodes, which are placed in cache and are not

yet freed, if there are no attached sockets.
So question is how does it work for sockets?
--

	Evgeniy Polyakov

--

All inodes are inactivated and put on a lru before they are freed. Those

could be reclaimed by inode defrag. Socket inode defrag is not that

important. Just shows that this can be applied in a general way.
--

I have to check my memory, but iput()->destroy_inode() highlights first for sockets...
--

	Evgeniy Polyakov

--