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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
18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19  *
20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21  * CA 95054 USA or visit www.sun.com if you need additional information or
22  * have any questions.
23  *
24  * GPL HEADER END
25  */
26 /*
27  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
28  * Use is subject to license terms.
29  *
30  * Copyright (c) 2012, Intel Corporation.
31  */
32 /*
33  * This file is part of Lustre, http://www.lustre.org/
34  * Lustre is a trademark of Sun Microsystems, Inc.
35  *
36  * cl_object implementation for VVP layer.
37  *
38  *   Author: Nikita Danilov <nikita.danilov@sun.com>
39  */
40 
41 #define DEBUG_SUBSYSTEM S_LLITE
42 
43 #include "../../include/linux/libcfs/libcfs.h"
44 
45 #include "../include/obd.h"
46 #include "../include/lustre_lite.h"
47 
48 #include "vvp_internal.h"
49 
50 /*****************************************************************************
51  *
52  * Object operations.
53  *
54  */
55 
vvp_object_print(const struct lu_env * env,void * cookie,lu_printer_t p,const struct lu_object * o)56 static int vvp_object_print(const struct lu_env *env, void *cookie,
57 			    lu_printer_t p, const struct lu_object *o)
58 {
59 	struct ccc_object    *obj   = lu2ccc(o);
60 	struct inode	 *inode = obj->cob_inode;
61 	struct ll_inode_info *lli;
62 
63 	(*p)(env, cookie, "(%s %d %d) inode: %p ",
64 	     list_empty(&obj->cob_pending_list) ? "-" : "+",
65 	     obj->cob_transient_pages, atomic_read(&obj->cob_mmap_cnt),
66 	     inode);
67 	if (inode) {
68 		lli = ll_i2info(inode);
69 		(*p)(env, cookie, "%lu/%u %o %u %d %p "DFID,
70 		     inode->i_ino, inode->i_generation, inode->i_mode,
71 		     inode->i_nlink, atomic_read(&inode->i_count),
72 		     lli->lli_clob, PFID(&lli->lli_fid));
73 	}
74 	return 0;
75 }
76 
vvp_attr_get(const struct lu_env * env,struct cl_object * obj,struct cl_attr * attr)77 static int vvp_attr_get(const struct lu_env *env, struct cl_object *obj,
78 			struct cl_attr *attr)
79 {
80 	struct inode *inode = ccc_object_inode(obj);
81 
82 	/*
83 	 * lov overwrites most of these fields in
84 	 * lov_attr_get()->...lov_merge_lvb_kms(), except when inode
85 	 * attributes are newer.
86 	 */
87 
88 	attr->cat_size = i_size_read(inode);
89 	attr->cat_mtime = inode->i_mtime.tv_sec;
90 	attr->cat_atime = inode->i_atime.tv_sec;
91 	attr->cat_ctime = inode->i_ctime.tv_sec;
92 	attr->cat_blocks = inode->i_blocks;
93 	attr->cat_uid = from_kuid(&init_user_ns, inode->i_uid);
94 	attr->cat_gid = from_kgid(&init_user_ns, inode->i_gid);
95 	/* KMS is not known by this layer */
96 	return 0; /* layers below have to fill in the rest */
97 }
98 
vvp_attr_set(const struct lu_env * env,struct cl_object * obj,const struct cl_attr * attr,unsigned valid)99 static int vvp_attr_set(const struct lu_env *env, struct cl_object *obj,
100 			const struct cl_attr *attr, unsigned valid)
101 {
102 	struct inode *inode = ccc_object_inode(obj);
103 
104 	if (valid & CAT_UID)
105 		inode->i_uid = make_kuid(&init_user_ns, attr->cat_uid);
106 	if (valid & CAT_GID)
107 		inode->i_gid = make_kgid(&init_user_ns, attr->cat_gid);
108 	if (valid & CAT_ATIME)
109 		inode->i_atime.tv_sec = attr->cat_atime;
110 	if (valid & CAT_MTIME)
111 		inode->i_mtime.tv_sec = attr->cat_mtime;
112 	if (valid & CAT_CTIME)
113 		inode->i_ctime.tv_sec = attr->cat_ctime;
114 	if (0 && valid & CAT_SIZE)
115 		cl_isize_write_nolock(inode, attr->cat_size);
116 	/* not currently necessary */
117 	if (0 && valid & (CAT_UID|CAT_GID|CAT_SIZE))
118 		mark_inode_dirty(inode);
119 	return 0;
120 }
121 
vvp_conf_set(const struct lu_env * env,struct cl_object * obj,const struct cl_object_conf * conf)122 static int vvp_conf_set(const struct lu_env *env, struct cl_object *obj,
123 			const struct cl_object_conf *conf)
124 {
125 	struct ll_inode_info *lli = ll_i2info(conf->coc_inode);
126 
127 	if (conf->coc_opc == OBJECT_CONF_INVALIDATE) {
128 		CDEBUG(D_VFSTRACE, DFID ": losing layout lock\n",
129 		       PFID(&lli->lli_fid));
130 
131 		ll_layout_version_set(lli, LL_LAYOUT_GEN_NONE);
132 
133 		/* Clean up page mmap for this inode.
134 		 * The reason for us to do this is that if the page has
135 		 * already been installed into memory space, the process
136 		 * can access it without interacting with lustre, so this
137 		 * page may be stale due to layout change, and the process
138 		 * will never be notified.
139 		 * This operation is expensive but mmap processes have to pay
140 		 * a price themselves. */
141 		unmap_mapping_range(conf->coc_inode->i_mapping,
142 				    0, OBD_OBJECT_EOF, 0);
143 
144 		return 0;
145 	}
146 
147 	if (conf->coc_opc != OBJECT_CONF_SET)
148 		return 0;
149 
150 	if (conf->u.coc_md != NULL && conf->u.coc_md->lsm != NULL) {
151 		CDEBUG(D_VFSTRACE, DFID ": layout version change: %u -> %u\n",
152 		       PFID(&lli->lli_fid), lli->lli_layout_gen,
153 		       conf->u.coc_md->lsm->lsm_layout_gen);
154 
155 		lli->lli_has_smd = lsm_has_objects(conf->u.coc_md->lsm);
156 		ll_layout_version_set(lli, conf->u.coc_md->lsm->lsm_layout_gen);
157 	} else {
158 		CDEBUG(D_VFSTRACE, DFID ": layout nuked: %u.\n",
159 		       PFID(&lli->lli_fid), lli->lli_layout_gen);
160 
161 		lli->lli_has_smd = false;
162 		ll_layout_version_set(lli, LL_LAYOUT_GEN_EMPTY);
163 	}
164 	return 0;
165 }
166 
167 static const struct cl_object_operations vvp_ops = {
168 	.coo_page_init = vvp_page_init,
169 	.coo_lock_init = vvp_lock_init,
170 	.coo_io_init   = vvp_io_init,
171 	.coo_attr_get  = vvp_attr_get,
172 	.coo_attr_set  = vvp_attr_set,
173 	.coo_conf_set  = vvp_conf_set,
174 	.coo_glimpse   = ccc_object_glimpse
175 };
176 
177 static const struct lu_object_operations vvp_lu_obj_ops = {
178 	.loo_object_init  = ccc_object_init,
179 	.loo_object_free  = ccc_object_free,
180 	.loo_object_print = vvp_object_print
181 };
182 
cl_inode2ccc(struct inode * inode)183 struct ccc_object *cl_inode2ccc(struct inode *inode)
184 {
185 	struct cl_inode_info *lli = cl_i2info(inode);
186 	struct cl_object     *obj = lli->lli_clob;
187 	struct lu_object     *lu;
188 
189 	LASSERT(obj != NULL);
190 	lu = lu_object_locate(obj->co_lu.lo_header, &vvp_device_type);
191 	LASSERT(lu != NULL);
192 	return lu2ccc(lu);
193 }
194 
vvp_object_alloc(const struct lu_env * env,const struct lu_object_header * hdr,struct lu_device * dev)195 struct lu_object *vvp_object_alloc(const struct lu_env *env,
196 				   const struct lu_object_header *hdr,
197 				   struct lu_device *dev)
198 {
199 	return ccc_object_alloc(env, hdr, dev, &vvp_ops, &vvp_lu_obj_ops);
200 }
201