Initial import

1 files changed, 678 insertions, 0 deletions

diff --git a/fs/nfs/objlayout/objio_osd.c b/fs/nfs/objlayout/objio_osd.c
new file mode 100644
index 000000000..5aaed3635
--- /dev/null
+++ b/fs/nfs/objlayout/objio_osd.c
@@ -0,0 +1,678 @@
+/*
+ *  pNFS Objects layout implementation over open-osd initiator library
+ *
+ *  Copyright (C) 2009 Panasas Inc. [year of first publication]
+ *  All rights reserved.
+ *
+ *  Benny Halevy <bhalevy@panasas.com>
+ *  Boaz Harrosh <ooo@electrozaur.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  See the file COPYING included with this distribution for more details.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *  3. Neither the name of the Panasas company nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/module.h>
+#include <scsi/osd_ore.h>
+
+#include "objlayout.h"
+#include "../internal.h"
+
+#define NFSDBG_FACILITY         NFSDBG_PNFS_LD
+
+struct objio_dev_ent {
+	struct nfs4_deviceid_node id_node;
+	struct ore_dev od;
+};
+
+static void
+objio_free_deviceid_node(struct nfs4_deviceid_node *d)
+{
+	struct objio_dev_ent *de = container_of(d, struct objio_dev_ent, id_node);
+
+	dprintk("%s: free od=%p\n", __func__, de->od.od);
+	osduld_put_device(de->od.od);
+	kfree_rcu(d, rcu);
+}
+
+struct objio_segment {
+	struct pnfs_layout_segment lseg;
+
+	struct ore_layout layout;
+	struct ore_components oc;
+};
+
+static inline struct objio_segment *
+OBJIO_LSEG(struct pnfs_layout_segment *lseg)
+{
+	return container_of(lseg, struct objio_segment, lseg);
+}
+
+struct objio_state {
+	/* Generic layer */
+	struct objlayout_io_res oir;
+
+	bool sync;
+	/*FIXME: Support for extra_bytes at ore_get_rw_state() */
+	struct ore_io_state *ios;
+};
+
+/* Send and wait for a get_device_info of devices in the layout,
+   then look them up with the osd_initiator library */
+struct nfs4_deviceid_node *
+objio_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
+			gfp_t gfp_flags)
+{
+	struct pnfs_osd_deviceaddr *deviceaddr;
+	struct objio_dev_ent *ode = NULL;
+	struct osd_dev *od;
+	struct osd_dev_info odi;
+	bool retry_flag = true;
+	__be32 *p;
+	int err;
+
+	deviceaddr = kzalloc(sizeof(*deviceaddr), gfp_flags);
+	if (!deviceaddr)
+		return NULL;
+
+	p = page_address(pdev->pages[0]);
+	pnfs_osd_xdr_decode_deviceaddr(deviceaddr, p);
+
+	odi.systemid_len = deviceaddr->oda_systemid.len;
+	if (odi.systemid_len > sizeof(odi.systemid)) {
+		dprintk("%s: odi.systemid_len > sizeof(systemid=%zd)\n",
+			__func__, sizeof(odi.systemid));
+		err = -EINVAL;
+		goto out;
+	} else if (odi.systemid_len)
+		memcpy(odi.systemid, deviceaddr->oda_systemid.data,
+		       odi.systemid_len);
+	odi.osdname_len	 = deviceaddr->oda_osdname.len;
+	odi.osdname	 = (u8 *)deviceaddr->oda_osdname.data;
+
+	if (!odi.osdname_len && !odi.systemid_len) {
+		dprintk("%s: !odi.osdname_len && !odi.systemid_len\n",
+			__func__);
+		err = -ENODEV;
+		goto out;
+	}
+
+retry_lookup:
+	od = osduld_info_lookup(&odi);
+	if (unlikely(IS_ERR(od))) {
+		err = PTR_ERR(od);
+		dprintk("%s: osduld_info_lookup => %d\n", __func__, err);
+		if (err == -ENODEV && retry_flag) {
+			err = objlayout_autologin(deviceaddr);
+			if (likely(!err)) {
+				retry_flag = false;
+				goto retry_lookup;
+			}
+		}
+		goto out;
+	}
+
+	dprintk("Adding new dev_id(%llx:%llx)\n",
+		_DEVID_LO(&pdev->dev_id), _DEVID_HI(&pdev->dev_id));
+
+	ode = kzalloc(sizeof(*ode), gfp_flags);
+	if (!ode) {
+		dprintk("%s: -ENOMEM od=%p\n", __func__, od);
+		goto out;
+	}
+
+	nfs4_init_deviceid_node(&ode->id_node, server, &pdev->dev_id);
+	kfree(deviceaddr);
+
+	ode->od.od = od;
+	return &ode->id_node;
+
+out:
+	kfree(deviceaddr);
+	return NULL;
+}
+
+static void copy_single_comp(struct ore_components *oc, unsigned c,
+			     struct pnfs_osd_object_cred *src_comp)
+{
+	struct ore_comp *ocomp = &oc->comps[c];
+
+	WARN_ON(src_comp->oc_cap_key.cred_len > 0); /* libosd is NO_SEC only */
+	WARN_ON(src_comp->oc_cap.cred_len > sizeof(ocomp->cred));
+
+	ocomp->obj.partition = src_comp->oc_object_id.oid_partition_id;
+	ocomp->obj.id = src_comp->oc_object_id.oid_object_id;
+
+	memcpy(ocomp->cred, src_comp->oc_cap.cred, sizeof(ocomp->cred));
+}
+
+static int __alloc_objio_seg(unsigned numdevs, gfp_t gfp_flags,
+		       struct objio_segment **pseg)
+{
+/*	This is the in memory structure of the objio_segment
+ *
+ *	struct __alloc_objio_segment {
+ *		struct objio_segment olseg;
+ *		struct ore_dev *ods[numdevs];
+ *		struct ore_comp	comps[numdevs];
+ *	} *aolseg;
+ *	NOTE: The code as above compiles and runs perfectly. It is elegant,
+ *	type safe and compact. At some Past time Linus has decided he does not
+ *	like variable length arrays, For the sake of this principal we uglify
+ *	the code as below.
+ */
+	struct objio_segment *lseg;
+	size_t lseg_size = sizeof(*lseg) +
+			numdevs * sizeof(lseg->oc.ods[0]) +
+			numdevs * sizeof(*lseg->oc.comps);
+
+	lseg = kzalloc(lseg_size, gfp_flags);
+	if (unlikely(!lseg)) {
+		dprintk("%s: Failed allocation numdevs=%d size=%zd\n", __func__,
+			numdevs, lseg_size);
+		return -ENOMEM;
+	}
+
+	lseg->oc.numdevs = numdevs;
+	lseg->oc.single_comp = EC_MULTPLE_COMPS;
+	lseg->oc.ods = (void *)(lseg + 1);
+	lseg->oc.comps = (void *)(lseg->oc.ods + numdevs);
+
+	*pseg = lseg;
+	return 0;
+}
+
+int objio_alloc_lseg(struct pnfs_layout_segment **outp,
+	struct pnfs_layout_hdr *pnfslay,
+	struct pnfs_layout_range *range,
+	struct xdr_stream *xdr,
+	gfp_t gfp_flags)
+{
+	struct nfs_server *server = NFS_SERVER(pnfslay->plh_inode);
+	struct objio_segment *objio_seg;
+	struct pnfs_osd_xdr_decode_layout_iter iter;
+	struct pnfs_osd_layout layout;
+	struct pnfs_osd_object_cred src_comp;
+	unsigned cur_comp;
+	int err;
+
+	err = pnfs_osd_xdr_decode_layout_map(&layout, &iter, xdr);
+	if (unlikely(err))
+		return err;
+
+	err = __alloc_objio_seg(layout.olo_num_comps, gfp_flags, &objio_seg);
+	if (unlikely(err))
+		return err;
+
+	objio_seg->layout.stripe_unit = layout.olo_map.odm_stripe_unit;
+	objio_seg->layout.group_width = layout.olo_map.odm_group_width;
+	objio_seg->layout.group_depth = layout.olo_map.odm_group_depth;
+	objio_seg->layout.mirrors_p1 = layout.olo_map.odm_mirror_cnt + 1;
+	objio_seg->layout.raid_algorithm = layout.olo_map.odm_raid_algorithm;
+
+	err = ore_verify_layout(layout.olo_map.odm_num_comps,
+					  &objio_seg->layout);
+	if (unlikely(err))
+		goto err;
+
+	objio_seg->oc.first_dev = layout.olo_comps_index;
+	cur_comp = 0;
+	while (pnfs_osd_xdr_decode_layout_comp(&src_comp, &iter, xdr, &err)) {
+		struct nfs4_deviceid_node *d;
+		struct objio_dev_ent *ode;
+
+		copy_single_comp(&objio_seg->oc, cur_comp, &src_comp);
+
+		d = nfs4_find_get_deviceid(server,
+				&src_comp.oc_object_id.oid_device_id,
+				pnfslay->plh_lc_cred, gfp_flags);
+		if (!d) {
+			err = -ENXIO;
+			goto err;
+		}
+
+		ode = container_of(d, struct objio_dev_ent, id_node);
+		objio_seg->oc.ods[cur_comp++] = &ode->od;
+	}
+	/* pnfs_osd_xdr_decode_layout_comp returns false on error */
+	if (unlikely(err))
+		goto err;
+
+	*outp = &objio_seg->lseg;
+	return 0;
+
+err:
+	kfree(objio_seg);
+	dprintk("%s: Error: return %d\n", __func__, err);
+	*outp = NULL;
+	return err;
+}
+
+void objio_free_lseg(struct pnfs_layout_segment *lseg)
+{
+	int i;
+	struct objio_segment *objio_seg = OBJIO_LSEG(lseg);
+
+	for (i = 0; i < objio_seg->oc.numdevs; i++) {
+		struct ore_dev *od = objio_seg->oc.ods[i];
+		struct objio_dev_ent *ode;
+
+		if (!od)
+			break;
+		ode = container_of(od, typeof(*ode), od);
+		nfs4_put_deviceid_node(&ode->id_node);
+	}
+	kfree(objio_seg);
+}
+
+static int
+objio_alloc_io_state(struct pnfs_layout_hdr *pnfs_layout_type, bool is_reading,
+	struct pnfs_layout_segment *lseg, struct page **pages, unsigned pgbase,
+	loff_t offset, size_t count, void *rpcdata, gfp_t gfp_flags,
+	struct objio_state **outp)
+{
+	struct objio_segment *objio_seg = OBJIO_LSEG(lseg);
+	struct ore_io_state *ios;
+	int ret;
+	struct __alloc_objio_state {
+		struct objio_state objios;
+		struct pnfs_osd_ioerr ioerrs[objio_seg->oc.numdevs];
+	} *aos;
+
+	aos = kzalloc(sizeof(*aos), gfp_flags);
+	if (unlikely(!aos))
+		return -ENOMEM;
+
+	objlayout_init_ioerrs(&aos->objios.oir, objio_seg->oc.numdevs,
+			aos->ioerrs, rpcdata, pnfs_layout_type);
+
+	ret = ore_get_rw_state(&objio_seg->layout, &objio_seg->oc, is_reading,
+			       offset, count, &ios);
+	if (unlikely(ret)) {
+		kfree(aos);
+		return ret;
+	}
+
+	ios->pages = pages;
+	ios->pgbase = pgbase;
+	ios->private = aos;
+	BUG_ON(ios->nr_pages > (pgbase + count + PAGE_SIZE - 1) >> PAGE_SHIFT);
+
+	aos->objios.sync = 0;
+	aos->objios.ios = ios;
+	*outp = &aos->objios;
+	return 0;
+}
+
+void objio_free_result(struct objlayout_io_res *oir)
+{
+	struct objio_state *objios = container_of(oir, struct objio_state, oir);
+
+	ore_put_io_state(objios->ios);
+	kfree(objios);
+}
+
+static enum pnfs_osd_errno osd_pri_2_pnfs_err(enum osd_err_priority oep)
+{
+	switch (oep) {
+	case OSD_ERR_PRI_NO_ERROR:
+		return (enum pnfs_osd_errno)0;
+
+	case OSD_ERR_PRI_CLEAR_PAGES:
+		BUG_ON(1);
+		return 0;
+
+	case OSD_ERR_PRI_RESOURCE:
+		return PNFS_OSD_ERR_RESOURCE;
+	case OSD_ERR_PRI_BAD_CRED:
+		return PNFS_OSD_ERR_BAD_CRED;
+	case OSD_ERR_PRI_NO_ACCESS:
+		return PNFS_OSD_ERR_NO_ACCESS;
+	case OSD_ERR_PRI_UNREACHABLE:
+		return PNFS_OSD_ERR_UNREACHABLE;
+	case OSD_ERR_PRI_NOT_FOUND:
+		return PNFS_OSD_ERR_NOT_FOUND;
+	case OSD_ERR_PRI_NO_SPACE:
+		return PNFS_OSD_ERR_NO_SPACE;
+	default:
+		WARN_ON(1);
+		/* fallthrough */
+	case OSD_ERR_PRI_EIO:
+		return PNFS_OSD_ERR_EIO;
+	}
+}
+
+static void __on_dev_error(struct ore_io_state *ios,
+	struct ore_dev *od, unsigned dev_index, enum osd_err_priority oep,
+	u64 dev_offset, u64  dev_len)
+{
+	struct objio_state *objios = ios->private;
+	struct pnfs_osd_objid pooid;
+	struct objio_dev_ent *ode = container_of(od, typeof(*ode), od);
+	/* FIXME: what to do with more-then-one-group layouts. We need to
+	 * translate from ore_io_state index to oc->comps index
+	 */
+	unsigned comp = dev_index;
+
+	pooid.oid_device_id = ode->id_node.deviceid;
+	pooid.oid_partition_id = ios->oc->comps[comp].obj.partition;
+	pooid.oid_object_id = ios->oc->comps[comp].obj.id;
+
+	objlayout_io_set_result(&objios->oir, comp,
+				&pooid, osd_pri_2_pnfs_err(oep),
+				dev_offset, dev_len, !ios->reading);
+}
+
+/*
+ * read
+ */
+static void _read_done(struct ore_io_state *ios, void *private)
+{
+	struct objio_state *objios = private;
+	ssize_t status;
+	int ret = ore_check_io(ios, &__on_dev_error);
+
+	/* FIXME: _io_free(ios) can we dealocate the libosd resources; */
+
+	if (likely(!ret))
+		status = ios->length;
+	else
+		status = ret;
+
+	objlayout_read_done(&objios->oir, status, objios->sync);
+}
+
+int objio_read_pagelist(struct nfs_pgio_header *hdr)
+{
+	struct objio_state *objios;
+	int ret;
+
+	ret = objio_alloc_io_state(NFS_I(hdr->inode)->layout, true,
+			hdr->lseg, hdr->args.pages, hdr->args.pgbase,
+			hdr->args.offset, hdr->args.count, hdr,
+			GFP_KERNEL, &objios);
+	if (unlikely(ret))
+		return ret;
+
+	objios->ios->done = _read_done;
+	dprintk("%s: offset=0x%llx length=0x%x\n", __func__,
+		hdr->args.offset, hdr->args.count);
+	ret = ore_read(objios->ios);
+	if (unlikely(ret))
+		objio_free_result(&objios->oir);
+	return ret;
+}
+
+/*
+ * write
+ */
+static void _write_done(struct ore_io_state *ios, void *private)
+{
+	struct objio_state *objios = private;
+	ssize_t status;
+	int ret = ore_check_io(ios, &__on_dev_error);
+
+	/* FIXME: _io_free(ios) can we dealocate the libosd resources; */
+
+	if (likely(!ret)) {
+		/* FIXME: should be based on the OSD's persistence model
+		 * See OSD2r05 Section 4.13 Data persistence model */
+		objios->oir.committed = NFS_FILE_SYNC;
+		status = ios->length;
+	} else {
+		status = ret;
+	}
+
+	objlayout_write_done(&objios->oir, status, objios->sync);
+}
+
+static struct page *__r4w_get_page(void *priv, u64 offset, bool *uptodate)
+{
+	struct objio_state *objios = priv;
+	struct nfs_pgio_header *hdr = objios->oir.rpcdata;
+	struct address_space *mapping = hdr->inode->i_mapping;
+	pgoff_t index = offset / PAGE_SIZE;
+	struct page *page;
+	loff_t i_size = i_size_read(hdr->inode);
+
+	if (offset >= i_size) {
+		*uptodate = true;
+		dprintk("%s: g_zero_page index=0x%lx\n", __func__, index);
+		return ZERO_PAGE(0);
+	}
+
+	page = find_get_page(mapping, index);
+	if (!page) {
+		page = find_or_create_page(mapping, index, GFP_NOFS);
+		if (unlikely(!page)) {
+			dprintk("%s: grab_cache_page Failed index=0x%lx\n",
+				__func__, index);
+			return NULL;
+		}
+		unlock_page(page);
+	}
+	if (PageDirty(page) || PageWriteback(page))
+		*uptodate = true;
+	else
+		*uptodate = PageUptodate(page);
+	dprintk("%s: index=0x%lx uptodate=%d\n", __func__, index, *uptodate);
+	return page;
+}
+
+static void __r4w_put_page(void *priv, struct page *page)
+{
+	dprintk("%s: index=0x%lx\n", __func__,
+		(page == ZERO_PAGE(0)) ? -1UL : page->index);
+	if (ZERO_PAGE(0) != page)
+		page_cache_release(page);
+	return;
+}
+
+static const struct _ore_r4w_op _r4w_op = {
+	.get_page = &__r4w_get_page,
+	.put_page = &__r4w_put_page,
+};
+
+int objio_write_pagelist(struct nfs_pgio_header *hdr, int how)
+{
+	struct objio_state *objios;
+	int ret;
+
+	ret = objio_alloc_io_state(NFS_I(hdr->inode)->layout, false,
+			hdr->lseg, hdr->args.pages, hdr->args.pgbase,
+			hdr->args.offset, hdr->args.count, hdr, GFP_NOFS,
+			&objios);
+	if (unlikely(ret))
+		return ret;
+
+	objios->sync = 0 != (how & FLUSH_SYNC);
+	objios->ios->r4w = &_r4w_op;
+
+	if (!objios->sync)
+		objios->ios->done = _write_done;
+
+	dprintk("%s: offset=0x%llx length=0x%x\n", __func__,
+		hdr->args.offset, hdr->args.count);
+	ret = ore_write(objios->ios);
+	if (unlikely(ret)) {
+		objio_free_result(&objios->oir);
+		return ret;
+	}
+
+	if (objios->sync)
+		_write_done(objios->ios, objios);
+
+	return 0;
+}
+
+/*
+ * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
+ * of bytes (maximum @req->wb_bytes) that can be coalesced.
+ */
+static size_t objio_pg_test(struct nfs_pageio_descriptor *pgio,
+			  struct nfs_page *prev, struct nfs_page *req)
+{
+	struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(pgio);
+	unsigned int size;
+
+	size = pnfs_generic_pg_test(pgio, prev, req);
+
+	if (!size || mirror->pg_count + req->wb_bytes >
+	    (unsigned long)pgio->pg_layout_private)
+		return 0;
+
+	return min(size, req->wb_bytes);
+}
+
+static void objio_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
+{
+	pnfs_generic_pg_init_read(pgio, req);
+	if (unlikely(pgio->pg_lseg == NULL))
+		return; /* Not pNFS */
+
+	pgio->pg_layout_private = (void *)
+				OBJIO_LSEG(pgio->pg_lseg)->layout.max_io_length;
+}
+
+static bool aligned_on_raid_stripe(u64 offset, struct ore_layout *layout,
+				   unsigned long *stripe_end)
+{
+	u32 stripe_off;
+	unsigned stripe_size;
+
+	if (layout->raid_algorithm == PNFS_OSD_RAID_0)
+		return true;
+
+	stripe_size = layout->stripe_unit *
+				(layout->group_width - layout->parity);
+
+	div_u64_rem(offset, stripe_size, &stripe_off);
+	if (!stripe_off)
+		return true;
+
+	*stripe_end = stripe_size - stripe_off;
+	return false;
+}
+
+static void objio_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
+{
+	unsigned long stripe_end = 0;
+	u64 wb_size;
+
+	if (pgio->pg_dreq == NULL)
+		wb_size = i_size_read(pgio->pg_inode) - req_offset(req);
+	else
+		wb_size = nfs_dreq_bytes_left(pgio->pg_dreq);
+
+	pnfs_generic_pg_init_write(pgio, req, wb_size);
+	if (unlikely(pgio->pg_lseg == NULL))
+		return; /* Not pNFS */
+
+	if (req->wb_offset ||
+	    !aligned_on_raid_stripe(req->wb_index * PAGE_SIZE,
+			       &OBJIO_LSEG(pgio->pg_lseg)->layout,
+			       &stripe_end)) {
+		pgio->pg_layout_private = (void *)stripe_end;
+	} else {
+		pgio->pg_layout_private = (void *)
+				OBJIO_LSEG(pgio->pg_lseg)->layout.max_io_length;
+	}
+}
+
+static const struct nfs_pageio_ops objio_pg_read_ops = {
+	.pg_init = objio_init_read,
+	.pg_test = objio_pg_test,
+	.pg_doio = pnfs_generic_pg_readpages,
+	.pg_cleanup = pnfs_generic_pg_cleanup,
+};
+
+static const struct nfs_pageio_ops objio_pg_write_ops = {
+	.pg_init = objio_init_write,
+	.pg_test = objio_pg_test,
+	.pg_doio = pnfs_generic_pg_writepages,
+	.pg_cleanup = pnfs_generic_pg_cleanup,
+};
+
+static struct pnfs_layoutdriver_type objlayout_type = {
+	.id = LAYOUT_OSD2_OBJECTS,
+	.name = "LAYOUT_OSD2_OBJECTS",
+	.flags                   = PNFS_LAYOUTRET_ON_SETATTR |
+				   PNFS_LAYOUTRET_ON_ERROR,
+
+	.max_deviceinfo_size	 = PAGE_SIZE,
+	.owner		       	 = THIS_MODULE,
+	.alloc_layout_hdr        = objlayout_alloc_layout_hdr,
+	.free_layout_hdr         = objlayout_free_layout_hdr,
+
+	.alloc_lseg              = objlayout_alloc_lseg,
+	.free_lseg               = objlayout_free_lseg,
+
+	.read_pagelist           = objlayout_read_pagelist,
+	.write_pagelist          = objlayout_write_pagelist,
+	.pg_read_ops             = &objio_pg_read_ops,
+	.pg_write_ops            = &objio_pg_write_ops,
+
+	.sync			 = pnfs_generic_sync,
+
+	.free_deviceid_node	 = objio_free_deviceid_node,
+
+	.encode_layoutcommit	 = objlayout_encode_layoutcommit,
+	.encode_layoutreturn     = objlayout_encode_layoutreturn,
+};
+
+MODULE_DESCRIPTION("pNFS Layout Driver for OSD2 objects");
+MODULE_AUTHOR("Benny Halevy <bhalevy@panasas.com>");
+MODULE_LICENSE("GPL");
+
+static int __init
+objlayout_init(void)
+{
+	int ret = pnfs_register_layoutdriver(&objlayout_type);
+
+	if (ret)
+		printk(KERN_INFO
+			"NFS: %s: Registering OSD pNFS Layout Driver failed: error=%d\n",
+			__func__, ret);
+	else
+		printk(KERN_INFO "NFS: %s: Registered OSD pNFS Layout Driver\n",
+			__func__);
+	return ret;
+}
+
+static void __exit
+objlayout_exit(void)
+{
+	pnfs_unregister_layoutdriver(&objlayout_type);
+	printk(KERN_INFO "NFS: %s: Unregistered OSD pNFS Layout Driver\n",
+	       __func__);
+}
+
+MODULE_ALIAS("nfs-layouttype4-2");
+
+module_init(objlayout_init);
+module_exit(objlayout_exit);