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authorDavid Howells <dhowells@redhat.com>2009-04-03 16:42:42 +0100
committerDavid Howells <dhowells@redhat.com>2009-04-03 16:42:42 +0100
commit8ec442ae4c6577ed181682e534d4eef524e30b3c (patch)
tree44fb9013929f7227781525d1904ac16d6723ce6e
parent3b9ce977b2f31b6c396b6fb620df9881a30fac9d (diff)
NFS: Register NFS for caching and retrieve the top-level index
Register NFS for caching and retrieve the top-level cache index object cookie. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Steve Dickson <steved@redhat.com> Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
-rw-r--r--fs/nfs/Makefile1
-rw-r--r--fs/nfs/fscache-index.c49
-rw-r--r--fs/nfs/fscache.h35
-rw-r--r--fs/nfs/inode.c8
4 files changed, 93 insertions, 0 deletions
diff --git a/fs/nfs/Makefile b/fs/nfs/Makefile
index ac6170c594a..0e0bb6c17a8 100644
--- a/fs/nfs/Makefile
+++ b/fs/nfs/Makefile
@@ -15,3 +15,4 @@ nfs-$(CONFIG_NFS_V4) += nfs4proc.o nfs4xdr.o nfs4state.o nfs4renewd.o \
callback.o callback_xdr.o callback_proc.o \
nfs4namespace.o
nfs-$(CONFIG_SYSCTL) += sysctl.o
+nfs-$(CONFIG_NFS_FSCACHE) += fscache-index.o
diff --git a/fs/nfs/fscache-index.c b/fs/nfs/fscache-index.c
new file mode 100644
index 00000000000..6d5bb5c6904
--- /dev/null
+++ b/fs/nfs/fscache-index.c
@@ -0,0 +1,49 @@
+/* NFS FS-Cache index structure definition
+ *
+ * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/nfs_fs.h>
+#include <linux/nfs_fs_sb.h>
+#include <linux/in6.h>
+
+#include "internal.h"
+#include "fscache.h"
+
+#define NFSDBG_FACILITY NFSDBG_FSCACHE
+
+/*
+ * Define the NFS filesystem for FS-Cache. Upon registration FS-Cache sticks
+ * the cookie for the top-level index object for NFS into here. The top-level
+ * index can than have other cache objects inserted into it.
+ */
+struct fscache_netfs nfs_fscache_netfs = {
+ .name = "nfs",
+ .version = 0,
+};
+
+/*
+ * Register NFS for caching
+ */
+int nfs_fscache_register(void)
+{
+ return fscache_register_netfs(&nfs_fscache_netfs);
+}
+
+/*
+ * Unregister NFS for caching
+ */
+void nfs_fscache_unregister(void)
+{
+ fscache_unregister_netfs(&nfs_fscache_netfs);
+}
diff --git a/fs/nfs/fscache.h b/fs/nfs/fscache.h
new file mode 100644
index 00000000000..ccfcdc58066
--- /dev/null
+++ b/fs/nfs/fscache.h
@@ -0,0 +1,35 @@
+/* NFS filesystem cache interface definitions
+ *
+ * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#ifndef _NFS_FSCACHE_H
+#define _NFS_FSCACHE_H
+
+#include <linux/nfs_fs.h>
+#include <linux/nfs_mount.h>
+#include <linux/nfs4_mount.h>
+#include <linux/fscache.h>
+
+#ifdef CONFIG_NFS_FSCACHE
+
+/*
+ * fscache-index.c
+ */
+extern struct fscache_netfs nfs_fscache_netfs;
+
+extern int nfs_fscache_register(void);
+extern void nfs_fscache_unregister(void);
+
+#else /* CONFIG_NFS_FSCACHE */
+static inline int nfs_fscache_register(void) { return 0; }
+static inline void nfs_fscache_unregister(void) {}
+
+#endif /* CONFIG_NFS_FSCACHE */
+#endif /* _NFS_FSCACHE_H */
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index a834d1d850b..cd29f410e94 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -46,6 +46,7 @@
#include "delegation.h"
#include "iostat.h"
#include "internal.h"
+#include "fscache.h"
#define NFSDBG_FACILITY NFSDBG_VFS
@@ -1436,6 +1437,10 @@ static int __init init_nfs_fs(void)
{
int err;
+ err = nfs_fscache_register();
+ if (err < 0)
+ goto out7;
+
err = nfsiod_start();
if (err)
goto out6;
@@ -1488,6 +1493,8 @@ out4:
out5:
nfsiod_stop();
out6:
+ nfs_fscache_unregister();
+out7:
return err;
}
@@ -1498,6 +1505,7 @@ static void __exit exit_nfs_fs(void)
nfs_destroy_readpagecache();
nfs_destroy_inodecache();
nfs_destroy_nfspagecache();
+ nfs_fscache_unregister();
#ifdef CONFIG_PROC_FS
rpc_proc_unregister("nfs");
#endif