diff mbox

[11/88] pnfsblock: blocklayout stub

Message ID 4904fc8cad92728785e9eec0cbefa4559397d805.1307464382.git.rees@umich.edu
State New, archived
Headers show

Commit Message

Jim Rees June 7, 2011, 5:27 p.m. UTC
From: Fred Isaman <iisaman@citi.umich.edu>

Adds the minimal structure for a pnfs block layout driver,
with all function pointers aimed at stubs.

[pnfsblock: SQUASHME: adjust to API change]
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
[pnfs: move pnfs_layout_type inline in nfs_inode]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[blocklayout: encode_layoutcommit implementation]
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
---
 fs/nfs/blocklayout/Makefile      |    4 +-
 fs/nfs/blocklayout/blocklayout.c |  224 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 226 insertions(+), 2 deletions(-)
 create mode 100644 fs/nfs/blocklayout/blocklayout.c
diff mbox

Patch

diff --git a/fs/nfs/blocklayout/Makefile b/fs/nfs/blocklayout/Makefile
index f214c1c..6bf49cd 100644
--- a/fs/nfs/blocklayout/Makefile
+++ b/fs/nfs/blocklayout/Makefile
@@ -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
diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
new file mode 100644
index 0000000..1312849
--- /dev/null
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -0,0 +1,224 @@ 
+/*
+ *  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 <linux/nfs_fs.h>
+#include <linux/pnfs_xdr.h> /* Needed by nfs4_pnfs.h */
+#include <linux/nfs4_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");
+
+/* Callback operations to the pNFS client */
+struct pnfs_client_operations *pnfs_callback_ops;
+
+static enum pnfs_try_status
+bl_commit(struct pnfs_layout_type *lo,
+		int sync,
+		struct nfs_write_data *nfs_data)
+{
+	dprintk("%s enter\n", __func__);
+	return PNFS_NOT_ATTEMPTED;
+}
+
+static enum pnfs_try_status
+bl_read_pagelist(struct pnfs_layout_type *lo,
+		struct page **pages,
+		unsigned int pgbase,
+		unsigned nr_pages,
+		loff_t offset,
+		size_t count,
+		struct nfs_read_data *nfs_data)
+{
+	dprintk("%s enter\n", __func__);
+	return PNFS_NOT_ATTEMPTED;
+}
+
+/* FRED - It can indicate bytes written in wdata->res.count.
+ * It can indicate error status in wdata->task.tk_status.
+ */
+static enum pnfs_try_status
+bl_write_pagelist(struct pnfs_layout_type *lo,
+		struct page **pages,
+		unsigned int pgbase,
+		unsigned nr_pages,
+		loff_t offset,
+		size_t count,
+		int sync,
+		struct nfs_write_data *wdata)
+{
+	dprintk("%s enter - just using nfs\n", __func__);
+	return PNFS_NOT_ATTEMPTED;
+}
+
+static void
+bl_free_layout(void *p)
+{
+	dprintk("%s enter\n", __func__);
+	return;
+}
+
+static void *
+bl_alloc_layout(struct pnfs_mount_type *mtype, struct inode *inode)
+{
+	dprintk("%s enter\n", __func__);
+	return NULL;
+}
+
+static void
+bl_free_lseg(struct pnfs_layout_segment *lseg)
+{
+	dprintk("%s enter\n", __func__);
+	return;
+}
+
+static struct pnfs_layout_segment *
+bl_alloc_lseg(struct pnfs_layout_type *lo,
+	      struct nfs4_pnfs_layoutget_res *lgr)
+{
+	dprintk("%s enter\n", __func__);
+	return NULL;
+}
+
+static int
+bl_setup_layoutcommit(struct pnfs_layout_type *lo,
+		      struct pnfs_layoutcommit_arg *arg)
+{
+	dprintk("%s enter\n", __func__);
+	return 0;
+}
+
+static void
+bl_encode_layoutcommit(struct pnfs_layout_type *lo, struct xdr_stream *xdr,
+		       const struct pnfs_layoutcommit_arg *arg)
+{
+	dprintk("%s enter\n", __func__);
+}
+
+static void
+bl_cleanup_layoutcommit(struct pnfs_layout_type *lo,
+			struct pnfs_layoutcommit_arg *arg, int status)
+{
+	dprintk("%s enter\n", __func__);
+}
+
+static struct pnfs_mount_type *
+bl_initialize_mountpoint(struct super_block *sb, struct nfs_fh *fh)
+{
+	dprintk("%s enter\n", __func__);
+	return NULL;
+}
+
+static int
+bl_uninitialize_mountpoint(struct pnfs_mount_type *mtype)
+{
+	dprintk("%s enter\n", __func__);
+	return 0;
+}
+
+static ssize_t
+bl_get_stripesize(struct pnfs_layout_type *lo)
+{
+	dprintk("%s enter\n", __func__);
+	return 0;
+}
+
+static ssize_t
+bl_get_io_threshold(struct pnfs_layout_type *lo, struct inode *inode)
+{
+	dprintk("%s enter\n", __func__);
+	return 0;
+}
+
+/* This is called by nfs_can_coalesce_requests via nfs_pageio_do_add_request.
+ * Should return False if there is a reason requests can not be coalesced,
+ * otherwise, should default to returning True.
+ */
+static int
+bl_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
+	   struct nfs_page *req)
+{
+	dprintk("%s enter\n", __func__);
+	return 1;
+}
+
+static struct layoutdriver_io_operations blocklayout_io_operations = {
+	.commit				= bl_commit,
+	.read_pagelist			= bl_read_pagelist,
+	.write_pagelist			= bl_write_pagelist,
+	.alloc_layout			= bl_alloc_layout,
+	.free_layout			= bl_free_layout,
+	.alloc_lseg			= bl_alloc_lseg,
+	.free_lseg			= bl_free_lseg,
+	.setup_layoutcommit		= bl_setup_layoutcommit,
+	.encode_layoutcommit		= bl_encode_layoutcommit,
+	.cleanup_layoutcommit		= bl_cleanup_layoutcommit,
+	.initialize_mountpoint		= bl_initialize_mountpoint,
+	.uninitialize_mountpoint	= bl_uninitialize_mountpoint,
+};
+
+static struct layoutdriver_policy_operations blocklayout_policy_operations = {
+	.get_stripesize			= bl_get_stripesize,
+	.get_read_threshold		= bl_get_io_threshold,
+	.get_write_threshold		= bl_get_io_threshold,
+	.pg_test			= bl_pg_test,
+};
+
+static struct pnfs_layoutdriver_type blocklayout_type = {
+	.id = LAYOUT_BLOCK_VOLUME,
+	.name = "LAYOUT_BLOCK_VOLUME",
+	.ld_io_ops = &blocklayout_io_operations,
+	.ld_policy_ops = &blocklayout_policy_operations,
+};
+
+static int __init nfs4blocklayout_init(void)
+{
+	dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__);
+
+	pnfs_callback_ops = pnfs_register_layoutdriver(&blocklayout_type);
+	return 0;
+}
+
+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);