[deliverable/linux.git] / drivers / staging / lustre / lustre / llite / vvp_object.c

/*
 * GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; If not, see
 * http://www.gnu.org/licenses/gpl-2.0.html
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2012, 2015, Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 *
 * cl_object implementation for VVP layer.
 *
 *   Author: Nikita Danilov <nikita.danilov@sun.com>
 */

#define DEBUG_SUBSYSTEM S_LLITE

#include "../../include/linux/libcfs/libcfs.h"

#include "../include/obd.h"
#include "../include/lustre_lite.h"

#include "llite_internal.h"
#include "vvp_internal.h"

/*****************************************************************************
 *
 * Object operations.
 *
 */

int vvp_object_invariant(const struct cl_object *obj)
{
	struct inode *inode  = vvp_object_inode(obj);
	struct ll_inode_info *lli = ll_i2info(inode);

	return (S_ISREG(inode->i_mode) || inode->i_mode == 0) &&
		lli->lli_clob == obj;
}

static int vvp_object_print(const struct lu_env *env, void *cookie,
			    lu_printer_t p, const struct lu_object *o)
{
	struct vvp_object    *obj   = lu2vvp(o);
	struct inode	 *inode = obj->vob_inode;
	struct ll_inode_info *lli;

	(*p)(env, cookie, "(%s %d %d) inode: %p ",
	     list_empty(&obj->vob_pending_list) ? "-" : "+",
	     obj->vob_transient_pages, atomic_read(&obj->vob_mmap_cnt),
	     inode);
	if (inode) {
		lli = ll_i2info(inode);
		(*p)(env, cookie, "%lu/%u %o %u %d %p "DFID,
		     inode->i_ino, inode->i_generation, inode->i_mode,
		     inode->i_nlink, atomic_read(&inode->i_count),
		     lli->lli_clob, PFID(&lli->lli_fid));
	}
	return 0;
}

static int vvp_attr_get(const struct lu_env *env, struct cl_object *obj,
			struct cl_attr *attr)
{
	struct inode *inode = vvp_object_inode(obj);

	/*
	 * lov overwrites most of these fields in
	 * lov_attr_get()->...lov_merge_lvb_kms(), except when inode
	 * attributes are newer.
	 */

	attr->cat_size = i_size_read(inode);
	attr->cat_mtime = inode->i_mtime.tv_sec;
	attr->cat_atime = inode->i_atime.tv_sec;
	attr->cat_ctime = inode->i_ctime.tv_sec;
	attr->cat_blocks = inode->i_blocks;
	attr->cat_uid = from_kuid(&init_user_ns, inode->i_uid);
	attr->cat_gid = from_kgid(&init_user_ns, inode->i_gid);
	/* KMS is not known by this layer */
	return 0; /* layers below have to fill in the rest */
}

static int vvp_attr_set(const struct lu_env *env, struct cl_object *obj,
			const struct cl_attr *attr, unsigned valid)
{
	struct inode *inode = vvp_object_inode(obj);

	if (valid & CAT_UID)
		inode->i_uid = make_kuid(&init_user_ns, attr->cat_uid);
	if (valid & CAT_GID)
		inode->i_gid = make_kgid(&init_user_ns, attr->cat_gid);
	if (valid & CAT_ATIME)
		inode->i_atime.tv_sec = attr->cat_atime;
	if (valid & CAT_MTIME)
		inode->i_mtime.tv_sec = attr->cat_mtime;
	if (valid & CAT_CTIME)
		inode->i_ctime.tv_sec = attr->cat_ctime;
	if (0 && valid & CAT_SIZE)
		i_size_write(inode, attr->cat_size);
	/* not currently necessary */
	if (0 && valid & (CAT_UID | CAT_GID | CAT_SIZE))
		mark_inode_dirty(inode);
	return 0;
}

static int vvp_conf_set(const struct lu_env *env, struct cl_object *obj,
			const struct cl_object_conf *conf)
{
	struct ll_inode_info *lli = ll_i2info(conf->coc_inode);

	if (conf->coc_opc == OBJECT_CONF_INVALIDATE) {
		CDEBUG(D_VFSTRACE, DFID ": losing layout lock\n",
		       PFID(&lli->lli_fid));

		ll_layout_version_set(lli, LL_LAYOUT_GEN_NONE);

		/* Clean up page mmap for this inode.
		 * The reason for us to do this is that if the page has
		 * already been installed into memory space, the process
		 * can access it without interacting with lustre, so this
		 * page may be stale due to layout change, and the process
		 * will never be notified.
		 * This operation is expensive but mmap processes have to pay
		 * a price themselves.
		 */
		unmap_mapping_range(conf->coc_inode->i_mapping,
				    0, OBD_OBJECT_EOF, 0);

		return 0;
	}

	if (conf->coc_opc != OBJECT_CONF_SET)
		return 0;

	if (conf->u.coc_md && conf->u.coc_md->lsm) {
		CDEBUG(D_VFSTRACE, DFID ": layout version change: %u -> %u\n",
		       PFID(&lli->lli_fid), lli->lli_layout_gen,
		       conf->u.coc_md->lsm->lsm_layout_gen);

		lli->lli_has_smd = lsm_has_objects(conf->u.coc_md->lsm);
		ll_layout_version_set(lli, conf->u.coc_md->lsm->lsm_layout_gen);
	} else {
		CDEBUG(D_VFSTRACE, DFID ": layout nuked: %u.\n",
		       PFID(&lli->lli_fid), lli->lli_layout_gen);

		lli->lli_has_smd = false;
		ll_layout_version_set(lli, LL_LAYOUT_GEN_EMPTY);
	}
	return 0;
}

static int vvp_prune(const struct lu_env *env, struct cl_object *obj)
{
	struct inode *inode = vvp_object_inode(obj);
	int rc;

	rc = cl_sync_file_range(inode, 0, OBD_OBJECT_EOF, CL_FSYNC_LOCAL, 1);
	if (rc < 0) {
		CDEBUG(D_VFSTRACE, DFID ": writeback failed: %d\n",
		       PFID(lu_object_fid(&obj->co_lu)), rc);
		return rc;
	}

	truncate_inode_pages(inode->i_mapping, 0);
	return 0;
}

static int vvp_object_glimpse(const struct lu_env *env,
			      const struct cl_object *obj, struct ost_lvb *lvb)
{
	struct inode *inode = vvp_object_inode(obj);

	lvb->lvb_mtime = LTIME_S(inode->i_mtime);
	lvb->lvb_atime = LTIME_S(inode->i_atime);
	lvb->lvb_ctime = LTIME_S(inode->i_ctime);
	/*
	 * LU-417: Add dirty pages block count lest i_blocks reports 0, some
	 * "cp" or "tar" on remote node may think it's a completely sparse file
	 * and skip it.
	 */
	if (lvb->lvb_size > 0 && lvb->lvb_blocks == 0)
		lvb->lvb_blocks = dirty_cnt(inode);
	return 0;
}

static const struct cl_object_operations vvp_ops = {
	.coo_page_init = vvp_page_init,
	.coo_lock_init = vvp_lock_init,
	.coo_io_init   = vvp_io_init,
	.coo_attr_get  = vvp_attr_get,
	.coo_attr_set  = vvp_attr_set,
	.coo_conf_set  = vvp_conf_set,
	.coo_prune     = vvp_prune,
	.coo_glimpse   = vvp_object_glimpse
};

static int vvp_object_init0(const struct lu_env *env,
			    struct vvp_object *vob,
			    const struct cl_object_conf *conf)
{
	vob->vob_inode = conf->coc_inode;
	vob->vob_transient_pages = 0;
	cl_object_page_init(&vob->vob_cl, sizeof(struct vvp_page));
	return 0;
}

static int vvp_object_init(const struct lu_env *env, struct lu_object *obj,
			   const struct lu_object_conf *conf)
{
	struct vvp_device *dev = lu2vvp_dev(obj->lo_dev);
	struct vvp_object *vob = lu2vvp(obj);
	struct lu_object  *below;
	struct lu_device  *under;
	int result;

	under = &dev->vdv_next->cd_lu_dev;
	below = under->ld_ops->ldo_object_alloc(env, obj->lo_header, under);
	if (below) {
		const struct cl_object_conf *cconf;

		cconf = lu2cl_conf(conf);
		INIT_LIST_HEAD(&vob->vob_pending_list);
		lu_object_add(obj, below);
		result = vvp_object_init0(env, vob, cconf);
	} else {
		result = -ENOMEM;
	}

	return result;
}

static void vvp_object_free(const struct lu_env *env, struct lu_object *obj)
{
	struct vvp_object *vob = lu2vvp(obj);

	lu_object_fini(obj);
	lu_object_header_fini(obj->lo_header);
	kmem_cache_free(vvp_object_kmem, vob);
}

static const struct lu_object_operations vvp_lu_obj_ops = {
	.loo_object_init	= vvp_object_init,
	.loo_object_free	= vvp_object_free,
	.loo_object_print	= vvp_object_print,
};

struct vvp_object *cl_inode2vvp(struct inode *inode)
{
	struct ll_inode_info *lli = ll_i2info(inode);
	struct cl_object     *obj = lli->lli_clob;
	struct lu_object     *lu;

	lu = lu_object_locate(obj->co_lu.lo_header, &vvp_device_type);
	LASSERT(lu);
	return lu2vvp(lu);
}

struct lu_object *vvp_object_alloc(const struct lu_env *env,
				   const struct lu_object_header *unused,
				   struct lu_device *dev)
{
	struct vvp_object *vob;
	struct lu_object  *obj;

	vob = kmem_cache_zalloc(vvp_object_kmem, GFP_NOFS);
	if (vob) {
		struct cl_object_header *hdr;

		obj = &vob->vob_cl.co_lu;
		hdr = &vob->vob_header;
		cl_object_header_init(hdr);
		hdr->coh_page_bufsize = cfs_size_round(sizeof(struct cl_page));

		lu_object_init(obj, &hdr->coh_lu, dev);
		lu_object_add_top(&hdr->coh_lu, obj);

		vob->vob_cl.co_ops = &vvp_ops;
		obj->lo_ops = &vvp_lu_obj_ops;
	} else {
		obj = NULL;
	}
	return obj;
}
Commit	Line	Data
d7e09d03 PT	1	/*
	2	* GPL HEADER START
	3	*
	4	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 only,
	8	* as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful, but
	11	* WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	* General Public License version 2 for more details (a copy is included
	14	* in the LICENSE file that accompanied this code).
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* version 2 along with this program; If not, see
6a5b99a4	18	* http://www.gnu.org/licenses/gpl-2.0.html
d7e09d03	19	*
d7e09d03 PT	20	* GPL HEADER END
	21	*/
	22	/*
	23	* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
	24	* Use is subject to license terms.
	25	*
1dc563a6	26	* Copyright (c) 2012, 2015, Intel Corporation.
d7e09d03 PT	27	*/
	28	/*
	29	* This file is part of Lustre, http://www.lustre.org/
	30	* Lustre is a trademark of Sun Microsystems, Inc.
	31	*
	32	* cl_object implementation for VVP layer.
	33	*
	34	* Author: Nikita Danilov <nikita.danilov@sun.com>
	35	*/
	36
	37	#define DEBUG_SUBSYSTEM S_LLITE
	38
9fdaf8c0	39	#include "../../include/linux/libcfs/libcfs.h"
d7e09d03	40
67a235f5 GKH	41	#include "../include/obd.h"
67a235f5 GKH	42	#include "../include/lustre_lite.h"
d7e09d03	43
0d345656	44	#include "llite_internal.h"
d7e09d03 PT	45	#include "vvp_internal.h"
	46
	47	/*****************************************************************************
	48	*
	49	* Object operations.
	50	*
	51	*/
	52
8c7b0e1a JH	53	int vvp_object_invariant(const struct cl_object *obj)
	54	{
	55	struct inode *inode = vvp_object_inode(obj);
	56	struct ll_inode_info *lli = ll_i2info(inode);
	57
	58	return (S_ISREG(inode->i_mode) \|\| inode->i_mode == 0) &&
	59	lli->lli_clob == obj;
	60	}
	61
d7e09d03 PT	62	static int vvp_object_print(const struct lu_env env, void cookie,
	63	lu_printer_t p, const struct lu_object *o)
	64	{
8c7b0e1a JH	65	struct vvp_object *obj = lu2vvp(o);
8c7b0e1a JH	66	struct inode *inode = obj->vob_inode;
d7e09d03 PT	67	struct ll_inode_info *lli;
	68
	69	(*p)(env, cookie, "(%s %d %d) inode: %p ",
8c7b0e1a JH	70	list_empty(&obj->vob_pending_list) ? "-" : "+",
8c7b0e1a JH	71	obj->vob_transient_pages, atomic_read(&obj->vob_mmap_cnt),
d7e09d03 PT	72	inode);
	73	if (inode) {
	74	lli = ll_i2info(inode);
	75	(*p)(env, cookie, "%lu/%u %o %u %d %p "DFID,
	76	inode->i_ino, inode->i_generation, inode->i_mode,
	77	inode->i_nlink, atomic_read(&inode->i_count),
	78	lli->lli_clob, PFID(&lli->lli_fid));
	79	}
	80	return 0;
	81	}
	82
	83	static int vvp_attr_get(const struct lu_env env, struct cl_object obj,
	84	struct cl_attr *attr)
	85	{
8c7b0e1a	86	struct inode *inode = vvp_object_inode(obj);
d7e09d03 PT	87
	88	/*
	89	* lov overwrites most of these fields in
	90	* lov_attr_get()->...lov_merge_lvb_kms(), except when inode
	91	* attributes are newer.
	92	*/
	93
	94	attr->cat_size = i_size_read(inode);
46c360f9 AB	95	attr->cat_mtime = inode->i_mtime.tv_sec;
	96	attr->cat_atime = inode->i_atime.tv_sec;
	97	attr->cat_ctime = inode->i_ctime.tv_sec;
d7e09d03	98	attr->cat_blocks = inode->i_blocks;
4b1a25f0 PT	99	attr->cat_uid = from_kuid(&init_user_ns, inode->i_uid);
4b1a25f0 PT	100	attr->cat_gid = from_kgid(&init_user_ns, inode->i_gid);
d7e09d03 PT	101	/* KMS is not known by this layer */
	102	return 0; /* layers below have to fill in the rest */
	103	}
	104
	105	static int vvp_attr_set(const struct lu_env env, struct cl_object obj,
	106	const struct cl_attr *attr, unsigned valid)
	107	{
8c7b0e1a	108	struct inode *inode = vvp_object_inode(obj);
d7e09d03 PT	109
d7e09d03 PT	110	if (valid & CAT_UID)
4b1a25f0	111	inode->i_uid = make_kuid(&init_user_ns, attr->cat_uid);
d7e09d03	112	if (valid & CAT_GID)
4b1a25f0	113	inode->i_gid = make_kgid(&init_user_ns, attr->cat_gid);
d7e09d03	114	if (valid & CAT_ATIME)
46c360f9	115	inode->i_atime.tv_sec = attr->cat_atime;
d7e09d03	116	if (valid & CAT_MTIME)
46c360f9	117	inode->i_mtime.tv_sec = attr->cat_mtime;
d7e09d03	118	if (valid & CAT_CTIME)
46c360f9	119	inode->i_ctime.tv_sec = attr->cat_ctime;
d7e09d03	120	if (0 && valid & CAT_SIZE)
1929c433	121	i_size_write(inode, attr->cat_size);
d7e09d03	122	/* not currently necessary */
cd94f231	123	if (0 && valid & (CAT_UID \| CAT_GID \| CAT_SIZE))
d7e09d03 PT	124	mark_inode_dirty(inode);
	125	return 0;
	126	}
	127
2d95f10e JH	128	static int vvp_conf_set(const struct lu_env env, struct cl_object obj,
2d95f10e JH	129	const struct cl_object_conf *conf)
d7e09d03 PT	130	{
	131	struct ll_inode_info *lli = ll_i2info(conf->coc_inode);
	132
	133	if (conf->coc_opc == OBJECT_CONF_INVALIDATE) {
09aed8a5 JX	134	CDEBUG(D_VFSTRACE, DFID ": losing layout lock\n",
	135	PFID(&lli->lli_fid));
	136
	137	ll_layout_version_set(lli, LL_LAYOUT_GEN_NONE);
	138
	139	/* Clean up page mmap for this inode.
	140	* The reason for us to do this is that if the page has
	141	* already been installed into memory space, the process
	142	* can access it without interacting with lustre, so this
	143	* page may be stale due to layout change, and the process
	144	* will never be notified.
	145	* This operation is expensive but mmap processes have to pay
c0894c6c OD	146	* a price themselves.
c0894c6c OD	147	*/
09aed8a5 JX	148	unmap_mapping_range(conf->coc_inode->i_mapping,
	149	0, OBD_OBJECT_EOF, 0);
	150
d7e09d03 PT	151	return 0;
	152	}
	153
	154	if (conf->coc_opc != OBJECT_CONF_SET)
	155	return 0;
	156
6e16818b	157	if (conf->u.coc_md && conf->u.coc_md->lsm) {
09aed8a5 JX	158	CDEBUG(D_VFSTRACE, DFID ": layout version change: %u -> %u\n",
	159	PFID(&lli->lli_fid), lli->lli_layout_gen,
	160	conf->u.coc_md->lsm->lsm_layout_gen);
d7e09d03	161
48d23e61	162	lli->lli_has_smd = lsm_has_objects(conf->u.coc_md->lsm);
09aed8a5	163	ll_layout_version_set(lli, conf->u.coc_md->lsm->lsm_layout_gen);
d7e09d03	164	} else {
09aed8a5 JX	165	CDEBUG(D_VFSTRACE, DFID ": layout nuked: %u.\n",
09aed8a5 JX	166	PFID(&lli->lli_fid), lli->lli_layout_gen);
d7e09d03 PT	167
d7e09d03 PT	168	lli->lli_has_smd = false;
09aed8a5	169	ll_layout_version_set(lli, LL_LAYOUT_GEN_EMPTY);
d7e09d03 PT	170	}
	171	return 0;
	172	}
	173
d9d47901 JX	174	static int vvp_prune(const struct lu_env env, struct cl_object obj)
d9d47901 JX	175	{
8c7b0e1a	176	struct inode *inode = vvp_object_inode(obj);
d9d47901 JX	177	int rc;
d9d47901 JX	178
06563b56 JX	179	rc = cl_sync_file_range(inode, 0, OBD_OBJECT_EOF, CL_FSYNC_LOCAL, 1);
	180	if (rc < 0) {
	181	CDEBUG(D_VFSTRACE, DFID ": writeback failed: %d\n",
	182	PFID(lu_object_fid(&obj->co_lu)), rc);
	183	return rc;
	184	}
d9d47901	185
06563b56 JX	186	truncate_inode_pages(inode->i_mapping, 0);
06563b56 JX	187	return 0;
d9d47901 JX	188	}
d9d47901 JX	189
8c7b0e1a JH	190	static int vvp_object_glimpse(const struct lu_env *env,
	191	const struct cl_object obj, struct ost_lvb lvb)
	192	{
	193	struct inode *inode = vvp_object_inode(obj);
	194
	195	lvb->lvb_mtime = LTIME_S(inode->i_mtime);
	196	lvb->lvb_atime = LTIME_S(inode->i_atime);
	197	lvb->lvb_ctime = LTIME_S(inode->i_ctime);
	198	/*
	199	* LU-417: Add dirty pages block count lest i_blocks reports 0, some
	200	* "cp" or "tar" on remote node may think it's a completely sparse file
	201	* and skip it.
	202	*/
	203	if (lvb->lvb_size > 0 && lvb->lvb_blocks == 0)
	204	lvb->lvb_blocks = dirty_cnt(inode);
	205	return 0;
	206	}
	207
d7e09d03 PT	208	static const struct cl_object_operations vvp_ops = {
	209	.coo_page_init = vvp_page_init,
	210	.coo_lock_init = vvp_lock_init,
	211	.coo_io_init = vvp_io_init,
	212	.coo_attr_get = vvp_attr_get,
	213	.coo_attr_set = vvp_attr_set,
	214	.coo_conf_set = vvp_conf_set,
d9d47901	215	.coo_prune = vvp_prune,
8c7b0e1a	216	.coo_glimpse = vvp_object_glimpse
d7e09d03 PT	217	};
d7e09d03 PT	218
8c7b0e1a JH	219	static int vvp_object_init0(const struct lu_env *env,
	220	struct vvp_object *vob,
	221	const struct cl_object_conf *conf)
	222	{
	223	vob->vob_inode = conf->coc_inode;
	224	vob->vob_transient_pages = 0;
3a52f803	225	cl_object_page_init(&vob->vob_cl, sizeof(struct vvp_page));
8c7b0e1a JH	226	return 0;
	227	}
	228
	229	static int vvp_object_init(const struct lu_env env, struct lu_object obj,
	230	const struct lu_object_conf *conf)
	231	{
	232	struct vvp_device *dev = lu2vvp_dev(obj->lo_dev);
	233	struct vvp_object *vob = lu2vvp(obj);
	234	struct lu_object *below;
	235	struct lu_device *under;
	236	int result;
	237
	238	under = &dev->vdv_next->cd_lu_dev;
	239	below = under->ld_ops->ldo_object_alloc(env, obj->lo_header, under);
	240	if (below) {
	241	const struct cl_object_conf *cconf;
	242
	243	cconf = lu2cl_conf(conf);
	244	INIT_LIST_HEAD(&vob->vob_pending_list);
	245	lu_object_add(obj, below);
	246	result = vvp_object_init0(env, vob, cconf);
	247	} else {
	248	result = -ENOMEM;
	249	}
	250
	251	return result;
	252	}
	253
	254	static void vvp_object_free(const struct lu_env env, struct lu_object obj)
	255	{
	256	struct vvp_object *vob = lu2vvp(obj);
	257
	258	lu_object_fini(obj);
	259	lu_object_header_fini(obj->lo_header);
	260	kmem_cache_free(vvp_object_kmem, vob);
	261	}
	262
d7e09d03	263	static const struct lu_object_operations vvp_lu_obj_ops = {
8c7b0e1a JH	264	.loo_object_init = vvp_object_init,
	265	.loo_object_free = vvp_object_free,
	266	.loo_object_print = vvp_object_print,
d7e09d03 PT	267	};
d7e09d03 PT	268
8c7b0e1a	269	struct vvp_object cl_inode2vvp(struct inode inode)
d7e09d03	270	{
1929c433	271	struct ll_inode_info *lli = ll_i2info(inode);
d7e09d03 PT	272	struct cl_object *obj = lli->lli_clob;
	273	struct lu_object *lu;
	274
d7e09d03	275	lu = lu_object_locate(obj->co_lu.lo_header, &vvp_device_type);
6e16818b	276	LASSERT(lu);
8c7b0e1a	277	return lu2vvp(lu);
d7e09d03 PT	278	}
	279
	280	struct lu_object vvp_object_alloc(const struct lu_env env,
8c7b0e1a	281	const struct lu_object_header *unused,
d7e09d03 PT	282	struct lu_device *dev)
d7e09d03 PT	283	{
8c7b0e1a JH	284	struct vvp_object *vob;
	285	struct lu_object *obj;
	286
	287	vob = kmem_cache_zalloc(vvp_object_kmem, GFP_NOFS);
	288	if (vob) {
	289	struct cl_object_header *hdr;
	290
	291	obj = &vob->vob_cl.co_lu;
	292	hdr = &vob->vob_header;
	293	cl_object_header_init(hdr);
	294	hdr->coh_page_bufsize = cfs_size_round(sizeof(struct cl_page));
	295
	296	lu_object_init(obj, &hdr->coh_lu, dev);
	297	lu_object_add_top(&hdr->coh_lu, obj);
	298
	299	vob->vob_cl.co_ops = &vvp_ops;
	300	obj->lo_ops = &vvp_lu_obj_ops;
	301	} else {
	302	obj = NULL;
	303	}
	304	return obj;
d7e09d03	305	}