@@ -1,5 +1,5 @@
#
# Makefile for the pNFS block layout driver kernel module
#
-obj-$(CONFIG_PNFS_BLOCK) +=
-blocklayoutdriver-objs :=
+obj-$(CONFIG_PNFS_BLOCK) += blocklayoutdriver.o
+blocklayoutdriver-objs := blocklayout.o
new file mode 100644
@@ -0,0 +1,166 @@
+/*
+ * linux/fs/nfs/blocklayout/blocklayout.c
+ *
+ * Module for the NFSv4.1 pNFS block layout driver.
+ *
+ * Copyright (c) 2006 The Regents of the University of Michigan.
+ * All rights reserved.
+ *
+ * Andy Adamson <andros@citi.umich.edu>
+ * Fred Isaman <iisaman@umich.edu>
+ *
+ * permission is granted to use, copy, create derivative works and
+ * redistribute this software and such derivative works for any purpose,
+ * so long as the name of the university of michigan is not used in
+ * any advertising or publicity pertaining to the use or distribution
+ * of this software without specific, written prior authorization. if
+ * the above copyright notice or any other identification of the
+ * university of michigan is included in any copy of any portion of
+ * this software, then the disclaimer below must also be included.
+ *
+ * this software is provided as is, without representation from the
+ * university of michigan as to its fitness for any purpose, and without
+ * warranty by the university of michigan of any kind, either express
+ * or implied, including without limitation the implied warranties of
+ * merchantability and fitness for a particular purpose. the regents
+ * of the university of michigan shall not be liable for any damages,
+ * including special, indirect, incidental, or consequential damages,
+ * with respect to any claim arising out or in connection with the use
+ * of the software, even if it has been or is hereafter advised of the
+ * possibility of such damages.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+
+#include "../pnfs.h"
+
+#define NFSDBG_FACILITY NFSDBG_PNFS_LD
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Andy Adamson <andros@citi.umich.edu>");
+MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver");
+
+static enum pnfs_try_status
+bl_read_pagelist(struct nfs_read_data *rdata)
+{
+ return PNFS_NOT_ATTEMPTED;
+}
+
+static enum pnfs_try_status
+bl_write_pagelist(struct nfs_write_data *wdata,
+ int sync)
+{
+ return PNFS_NOT_ATTEMPTED;
+}
+
+static void
+bl_free_layout_hdr(struct pnfs_layout_hdr *lo)
+{
+}
+
+static struct pnfs_layout_hdr *
+bl_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
+{
+ return NULL;
+}
+
+static void
+bl_free_lseg(struct pnfs_layout_segment *lseg)
+{
+}
+
+static struct pnfs_layout_segment *
+bl_alloc_lseg(struct pnfs_layout_hdr *lo,
+ struct nfs4_layoutget_res *lgr, gfp_t gfp_flags)
+{
+ return NULL;
+}
+
+static void
+bl_encode_layoutcommit(struct pnfs_layout_hdr *lo, struct xdr_stream *xdr,
+ const struct nfs4_layoutcommit_args *arg)
+{
+}
+
+static void
+bl_cleanup_layoutcommit(struct pnfs_layout_hdr *lo,
+ struct nfs4_layoutcommit_data *lcdata)
+{
+}
+
+static int
+bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh)
+{
+ dprintk("%s enter\n", __func__);
+ return 0;
+}
+
+static int
+bl_clear_layoutdriver(struct nfs_server *server)
+{
+ dprintk("%s enter\n", __func__);
+ return 0;
+}
+
+static int
+bl_write_begin(struct pnfs_layout_segment *lseg, struct page *page, loff_t pos,
+ unsigned count, struct pnfs_fsdata *fsdata)
+{
+ return 0;
+}
+
+static int
+bl_write_end(struct inode *inode, struct page *page, loff_t pos,
+ unsigned count, unsigned copied, struct pnfs_layout_segment *lseg)
+{
+ return 0;
+}
+
+/* Return any memory allocated to fsdata->private, and take advantage
+ * of no page locks to mark pages noted in write_begin as needing
+ * initialization.
+ */
+static void
+bl_write_end_cleanup(struct file *filp, struct pnfs_fsdata *fsdata)
+{
+}
+
+static struct pnfs_layoutdriver_type blocklayout_type = {
+ .id = LAYOUT_BLOCK_VOLUME,
+ .name = "LAYOUT_BLOCK_VOLUME",
+ .read_pagelist = bl_read_pagelist,
+ .write_pagelist = bl_write_pagelist,
+ .write_begin = bl_write_begin,
+ .write_end = bl_write_end,
+ .write_end_cleanup = bl_write_end_cleanup,
+ .alloc_layout_hdr = bl_alloc_layout_hdr,
+ .free_layout_hdr = bl_free_layout_hdr,
+ .alloc_lseg = bl_alloc_lseg,
+ .free_lseg = bl_free_lseg,
+ .encode_layoutcommit = bl_encode_layoutcommit,
+ .cleanup_layoutcommit = bl_cleanup_layoutcommit,
+ .set_layoutdriver = bl_set_layoutdriver,
+ .clear_layoutdriver = bl_clear_layoutdriver,
+ .pg_test = pnfs_generic_pg_test,
+};
+
+static int __init nfs4blocklayout_init(void)
+{
+ int ret;
+
+ dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__);
+
+ ret = pnfs_register_layoutdriver(&blocklayout_type);
+ return ret;
+}
+
+static void __exit nfs4blocklayout_exit(void)
+{
+ dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n",
+ __func__);
+
+ pnfs_unregister_layoutdriver(&blocklayout_type);
+}
+
+module_init(nfs4blocklayout_init);
+module_exit(nfs4blocklayout_exit);