fs/9p: Add v9fs_inode

Switch to the fscache code to v9fs_inode. We will later use
v9fs_inode in cache=loose mode to track the inode cache
validity timeout. Ie if we find an inode in cache older
that a specific jiffie range we will consider it stale

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

1 files changed, 58 insertions, 0 deletions

diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index 738be8f6994f..c82b017f51f3 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -39,6 +39,7 @@
 
 static DEFINE_SPINLOCK(v9fs_sessionlist_lock);
 static LIST_HEAD(v9fs_sessionlist);
+struct kmem_cache *v9fs_inode_cache;
 
 /*
  * Option Parsing (code inspired by NFS code)
@@ -481,6 +482,63 @@ static void v9fs_sysfs_cleanup(void)
         kobject_put(v9fs_kobj);
 }
 
+static void v9fs_inode_init_once(void *foo)
+{
+        struct v9fs_inode *v9inode = (struct v9fs_inode *)foo;
+#ifdef CONFIG_9P_FSCACHE
+        v9inode->fscache = NULL;
+        v9inode->fscache_key = NULL;
+#endif
+        inode_init_once(&v9inode->vfs_inode);
+}
+
+/**
+ * v9fs_init_inode_cache - initialize a cache for 9P
+ * Returns 0 on success.
+ */
+static int v9fs_init_inode_cache(void)
+{
+        v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache",
+                                          sizeof(struct v9fs_inode),
+                                          0, (SLAB_RECLAIM_ACCOUNT|
+                                              SLAB_MEM_SPREAD),
+                                          v9fs_inode_init_once);
+        if (!v9fs_inode_cache)
+                return -ENOMEM;
+
+        return 0;
+}
+
+/**
+ * v9fs_destroy_inode_cache - destroy the cache of 9P inode
+ *
+ */
+static void v9fs_destroy_inode_cache(void)
+{
+        kmem_cache_destroy(v9fs_inode_cache);
+}
+
+static int v9fs_cache_register(void)
+{
+        int ret;
+        ret = v9fs_init_inode_cache();
+        if (ret < 0)
+                return ret;
+#ifdef CONFIG_9P_FSCACHE
+        return fscache_register_netfs(&v9fs_cache_netfs);
+#else
+        return ret;
+#endif
+}
+
+static void v9fs_cache_unregister(void)
+{
+        v9fs_destroy_inode_cache();
+#ifdef CONFIG_9P_FSCACHE
+        fscache_unregister_netfs(&v9fs_cache_netfs);
+#endif
+}
+
 /**
  * init_v9fs - Initialize module
  *