[PATCH 20/50] pnfs_submit: filelayout alloc_layout and free_layout

[andros@netapp.com]

From: The pNFS Team <linux-nfs@vger.kernel.org>

Signed-off-by: Andy Adamson <andros@netapp.com>
---
 fs/nfs/nfs4filelayout.c |   24 ++++++++++++++++++++++++
 fs/nfs/nfs4filelayout.h |   10 ++++++++++
 2 files changed, 34 insertions(+), 0 deletions(-)

diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index 7039d9d..e1a09a8 100644
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -82,7 +82,31 @@ filelayout_uninitialize_mountpoint(struct nfs_server *nfss)
 	return 0;
 }
 
+/*
+ * Create a filelayout layout structure and return it.  The pNFS client
+ * will use the pnfs_layout_type type to refer to the layout for this
+ * inode from now on.
+ */
+static struct pnfs_layout_type *
+filelayout_alloc_layout(struct inode *inode)
+{
+	struct nfs4_filelayout *flp;
+
+	dprintk("NFS_FILELAYOUT: allocating layout\n");
+	flp =  kzalloc(sizeof(struct nfs4_filelayout), GFP_KERNEL);
+	return flp ? &flp->fl_layout : NULL;
+}
+
+/* Free a filelayout layout structure */
+static void
+filelayout_free_layout(struct pnfs_layout_type *lo)
+{
+	dprintk("NFS_FILELAYOUT: freeing layout\n");
+	kfree(FILE_LO(lo));
+}
 struct layoutdriver_io_operations filelayout_io_operations = {
+	.alloc_layout            = filelayout_alloc_layout,
+	.free_layout             = filelayout_free_layout,
 	.initialize_mountpoint   = filelayout_initialize_mountpoint,
 	.uninitialize_mountpoint = filelayout_uninitialize_mountpoint,
 };
diff --git a/fs/nfs/nfs4filelayout.h b/fs/nfs/nfs4filelayout.h
index be3c9fe..ad975fd 100644
--- a/fs/nfs/nfs4filelayout.h
+++ b/fs/nfs/nfs4filelayout.h
@@ -41,6 +41,16 @@ struct nfs4_file_layout_dsaddr {
 	struct nfs4_pnfs_ds	*ds_list[1];
 };
 
+struct nfs4_filelayout {
+	struct pnfs_layout_type fl_layout;
+	u32 stripe_unit;
+};
+
+static inline struct nfs4_filelayout *
+FILE_LO(struct pnfs_layout_type *lo)
+{
+	return container_of(lo, struct nfs4_filelayout, fl_layout);
+}
 
 extern struct pnfs_client_operations *pnfs_callback_ops;
 
-- 
1.6.2.5