1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
30 * Use is subject to license terms.
32 * Copyright (c) 2011 Whamcloud, Inc.
36 * This file is part of Lustre, http://www.lustre.org/
37 * Lustre is a trademark of Sun Microsystems, Inc.
39 * Implementation of cl_page for LOV layer.
41 * Author: Nikita Danilov <nikita.danilov@sun.com>
44 #define DEBUG_SUBSYSTEM S_LOV
46 #include "lov_cl_internal.h"
52 /*****************************************************************************
54 * Lov page operations.
58 static int lov_page_invariant(const struct cl_page_slice *slice)
60 const struct cl_page *page = slice->cpl_page;
61 const struct cl_page *sub = lov_sub_page(slice);
63 return ergo(sub != NULL,
64 page->cp_child == sub &&
65 sub->cp_parent == page &&
66 page->cp_state == sub->cp_state);
69 static void lov_page_fini(const struct lu_env *env,
70 struct cl_page_slice *slice)
72 struct lov_page *lp = cl2lov_page(slice);
73 struct cl_page *sub = lov_sub_page(slice);
75 LINVRNT(lov_page_invariant(slice));
79 LASSERT(sub->cp_state == CPS_FREEING);
80 lu_ref_del(&sub->cp_reference, "lov", sub->cp_parent);
81 sub->cp_parent = NULL;
82 slice->cpl_page->cp_child = NULL;
83 cl_page_put(env, sub);
85 OBD_SLAB_FREE_PTR(lp, lov_page_kmem);
89 static int lov_page_own(const struct lu_env *env,
90 const struct cl_page_slice *slice, struct cl_io *io,
93 struct lov_io *lio = lov_env_io(env);
94 struct lov_io_sub *sub;
96 LINVRNT(lov_page_invariant(slice));
97 LINVRNT(!cl2lov_page(slice)->lps_invalid);
100 sub = lov_page_subio(env, lio, slice);
102 lov_sub_page(slice)->cp_owner = sub->sub_io;
109 static void lov_page_assume(const struct lu_env *env,
110 const struct cl_page_slice *slice, struct cl_io *io)
112 lov_page_own(env, slice, io, 0);
115 static int lov_page_print(const struct lu_env *env,
116 const struct cl_page_slice *slice,
117 void *cookie, lu_printer_t printer)
119 struct lov_page *lp = cl2lov_page(slice);
121 return (*printer)(env, cookie, LUSTRE_LOV_NAME"-page@%p\n", lp);
124 static const struct cl_page_operations lov_page_ops = {
125 .cpo_fini = lov_page_fini,
126 .cpo_own = lov_page_own,
127 .cpo_assume = lov_page_assume,
128 .cpo_print = lov_page_print
131 static void lov_empty_page_fini(const struct lu_env *env,
132 struct cl_page_slice *slice)
134 struct lov_page *lp = cl2lov_page(slice);
136 LASSERT(slice->cpl_page->cp_child == NULL);
138 OBD_SLAB_FREE_PTR(lp, lov_page_kmem);
142 struct cl_page *lov_page_init_raid0(const struct lu_env *env,
143 struct cl_object *obj, struct cl_page *page,
146 struct lov_object *loo = cl2lov(obj);
147 struct lov_layout_raid0 *r0 = lov_r0(loo);
148 struct lov_io *lio = lov_env_io(env);
149 struct cl_page *subpage;
150 struct cl_object *subobj;
151 struct lov_io_sub *sub;
152 struct lov_page *lpg;
153 struct cl_page *result;
160 offset = cl_offset(obj, page->cp_index);
161 stripe = lov_stripe_number(r0->lo_lsm, offset);
162 LASSERT(stripe < r0->lo_nr);
163 rc = lov_stripe_offset(r0->lo_lsm, offset, stripe,
167 OBD_SLAB_ALLOC_PTR_GFP(lpg, lov_page_kmem, CFS_ALLOC_IO);
169 GOTO(out, result = ERR_PTR(-ENOMEM));
171 lpg->lps_invalid = 1;
172 cl_page_slice_add(page, &lpg->lps_cl, obj, &lov_page_ops);
174 sub = lov_sub_get(env, lio, stripe);
176 GOTO(out, result = (struct cl_page *)sub);
178 subobj = lovsub2cl(r0->lo_sub[stripe]);
179 subpage = cl_page_find_sub(sub->sub_env, subobj,
180 cl_index(subobj, suboff), vmpage, page);
183 GOTO(out, result = subpage);
185 if (likely(subpage->cp_parent == page)) {
186 lu_ref_add(&subpage->cp_reference, "lov", page);
187 lpg->lps_invalid = 0;
190 CL_PAGE_DEBUG(D_ERROR, env, page, "parent page\n");
191 CL_PAGE_DEBUG(D_ERROR, env, subpage, "child page\n");
201 static const struct cl_page_operations lov_empty_page_ops = {
202 .cpo_fini = lov_empty_page_fini,
203 .cpo_print = lov_page_print
206 struct cl_page *lov_page_init_empty(const struct lu_env *env,
207 struct cl_object *obj, struct cl_page *page,
210 struct lov_page *lpg;
211 int result = -ENOMEM;
214 OBD_SLAB_ALLOC_PTR_GFP(lpg, lov_page_kmem, CFS_ALLOC_IO);
217 cl_page_slice_add(page, &lpg->lps_cl,
218 obj, &lov_empty_page_ops);
219 addr = cfs_kmap(vmpage);
220 memset(addr, 0, cl_page_size(obj));
222 cl_page_export(env, page, 1);
225 RETURN(ERR_PTR(result));