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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 | |
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) 2011, 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 | * Implementation of cl_page for LOV layer. | |
37 | * | |
38 | * Author: Nikita Danilov <nikita.danilov@sun.com> | |
39 | */ | |
40 | ||
41 | #define DEBUG_SUBSYSTEM S_LOV | |
42 | ||
43 | #include "lov_cl_internal.h" | |
44 | ||
45 | /** \addtogroup lov | |
46 | * @{ | |
47 | */ | |
48 | ||
49 | /***************************************************************************** | |
50 | * | |
51 | * Lov page operations. | |
52 | * | |
53 | */ | |
54 | ||
55 | static int lov_page_invariant(const struct cl_page_slice *slice) | |
56 | { | |
57 | const struct cl_page *page = slice->cpl_page; | |
58 | const struct cl_page *sub = lov_sub_page(slice); | |
59 | ||
60 | return ergo(sub != NULL, | |
61 | page->cp_child == sub && | |
62 | sub->cp_parent == page && | |
63 | page->cp_state == sub->cp_state); | |
64 | } | |
65 | ||
66 | static void lov_page_fini(const struct lu_env *env, | |
67 | struct cl_page_slice *slice) | |
68 | { | |
69 | struct cl_page *sub = lov_sub_page(slice); | |
70 | ||
71 | LINVRNT(lov_page_invariant(slice)); | |
d7e09d03 PT |
72 | |
73 | if (sub != NULL) { | |
74 | LASSERT(sub->cp_state == CPS_FREEING); | |
75 | lu_ref_del(&sub->cp_reference, "lov", sub->cp_parent); | |
76 | sub->cp_parent = NULL; | |
77 | slice->cpl_page->cp_child = NULL; | |
78 | cl_page_put(env, sub); | |
79 | } | |
d7e09d03 PT |
80 | } |
81 | ||
82 | static int lov_page_own(const struct lu_env *env, | |
83 | const struct cl_page_slice *slice, struct cl_io *io, | |
84 | int nonblock) | |
85 | { | |
86 | struct lov_io *lio = lov_env_io(env); | |
87 | struct lov_io_sub *sub; | |
88 | ||
89 | LINVRNT(lov_page_invariant(slice)); | |
90 | LINVRNT(!cl2lov_page(slice)->lps_invalid); | |
d7e09d03 PT |
91 | |
92 | sub = lov_page_subio(env, lio, slice); | |
93 | if (!IS_ERR(sub)) { | |
94 | lov_sub_page(slice)->cp_owner = sub->sub_io; | |
95 | lov_sub_put(sub); | |
96 | } else | |
97 | LBUG(); /* Arrgh */ | |
0a3bdb00 | 98 | return 0; |
d7e09d03 PT |
99 | } |
100 | ||
101 | static void lov_page_assume(const struct lu_env *env, | |
102 | const struct cl_page_slice *slice, struct cl_io *io) | |
103 | { | |
104 | lov_page_own(env, slice, io, 0); | |
105 | } | |
106 | ||
107 | static int lov_page_cache_add(const struct lu_env *env, | |
108 | const struct cl_page_slice *slice, | |
109 | struct cl_io *io) | |
110 | { | |
111 | struct lov_io *lio = lov_env_io(env); | |
112 | struct lov_io_sub *sub; | |
113 | int rc = 0; | |
114 | ||
115 | LINVRNT(lov_page_invariant(slice)); | |
116 | LINVRNT(!cl2lov_page(slice)->lps_invalid); | |
d7e09d03 PT |
117 | |
118 | sub = lov_page_subio(env, lio, slice); | |
119 | if (!IS_ERR(sub)) { | |
120 | rc = cl_page_cache_add(sub->sub_env, sub->sub_io, | |
121 | slice->cpl_page->cp_child, CRT_WRITE); | |
122 | lov_sub_put(sub); | |
123 | } else { | |
124 | rc = PTR_ERR(sub); | |
125 | CL_PAGE_DEBUG(D_ERROR, env, slice->cpl_page, "rc = %d\n", rc); | |
126 | } | |
0a3bdb00 | 127 | return rc; |
d7e09d03 PT |
128 | } |
129 | ||
130 | static int lov_page_print(const struct lu_env *env, | |
131 | const struct cl_page_slice *slice, | |
132 | void *cookie, lu_printer_t printer) | |
133 | { | |
134 | struct lov_page *lp = cl2lov_page(slice); | |
135 | ||
136 | return (*printer)(env, cookie, LUSTRE_LOV_NAME"-page@%p\n", lp); | |
137 | } | |
138 | ||
139 | static const struct cl_page_operations lov_page_ops = { | |
140 | .cpo_fini = lov_page_fini, | |
141 | .cpo_own = lov_page_own, | |
142 | .cpo_assume = lov_page_assume, | |
143 | .io = { | |
144 | [CRT_WRITE] = { | |
145 | .cpo_cache_add = lov_page_cache_add | |
146 | } | |
147 | }, | |
148 | .cpo_print = lov_page_print | |
149 | }; | |
150 | ||
151 | static void lov_empty_page_fini(const struct lu_env *env, | |
152 | struct cl_page_slice *slice) | |
153 | { | |
154 | LASSERT(slice->cpl_page->cp_child == NULL); | |
155 | } | |
156 | ||
157 | int lov_page_init_raid0(const struct lu_env *env, struct cl_object *obj, | |
158 | struct cl_page *page, struct page *vmpage) | |
159 | { | |
160 | struct lov_object *loo = cl2lov(obj); | |
161 | struct lov_layout_raid0 *r0 = lov_r0(loo); | |
162 | struct lov_io *lio = lov_env_io(env); | |
163 | struct cl_page *subpage; | |
164 | struct cl_object *subobj; | |
165 | struct lov_io_sub *sub; | |
166 | struct lov_page *lpg = cl_object_page_slice(obj, page); | |
167 | loff_t offset; | |
168 | obd_off suboff; | |
169 | int stripe; | |
170 | int rc; | |
d7e09d03 PT |
171 | |
172 | offset = cl_offset(obj, page->cp_index); | |
173 | stripe = lov_stripe_number(loo->lo_lsm, offset); | |
174 | LASSERT(stripe < r0->lo_nr); | |
175 | rc = lov_stripe_offset(loo->lo_lsm, offset, stripe, | |
176 | &suboff); | |
177 | LASSERT(rc == 0); | |
178 | ||
179 | lpg->lps_invalid = 1; | |
180 | cl_page_slice_add(page, &lpg->lps_cl, obj, &lov_page_ops); | |
181 | ||
182 | sub = lov_sub_get(env, lio, stripe); | |
183 | if (IS_ERR(sub)) | |
184 | GOTO(out, rc = PTR_ERR(sub)); | |
185 | ||
186 | subobj = lovsub2cl(r0->lo_sub[stripe]); | |
187 | subpage = cl_page_find_sub(sub->sub_env, subobj, | |
188 | cl_index(subobj, suboff), vmpage, page); | |
189 | lov_sub_put(sub); | |
190 | if (IS_ERR(subpage)) | |
191 | GOTO(out, rc = PTR_ERR(subpage)); | |
192 | ||
193 | if (likely(subpage->cp_parent == page)) { | |
194 | lu_ref_add(&subpage->cp_reference, "lov", page); | |
195 | lpg->lps_invalid = 0; | |
196 | rc = 0; | |
197 | } else { | |
198 | CL_PAGE_DEBUG(D_ERROR, env, page, "parent page\n"); | |
199 | CL_PAGE_DEBUG(D_ERROR, env, subpage, "child page\n"); | |
200 | LASSERT(0); | |
201 | } | |
202 | ||
d7e09d03 PT |
203 | out: |
204 | return rc; | |
205 | } | |
206 | ||
207 | ||
208 | static const struct cl_page_operations lov_empty_page_ops = { | |
209 | .cpo_fini = lov_empty_page_fini, | |
210 | .cpo_print = lov_page_print | |
211 | }; | |
212 | ||
213 | int lov_page_init_empty(const struct lu_env *env, struct cl_object *obj, | |
214 | struct cl_page *page, struct page *vmpage) | |
215 | { | |
216 | struct lov_page *lpg = cl_object_page_slice(obj, page); | |
217 | void *addr; | |
d7e09d03 PT |
218 | |
219 | cl_page_slice_add(page, &lpg->lps_cl, obj, &lov_empty_page_ops); | |
220 | addr = kmap(vmpage); | |
221 | memset(addr, 0, cl_page_size(obj)); | |
222 | kunmap(vmpage); | |
223 | cl_page_export(env, page, 1); | |
0a3bdb00 | 224 | return 0; |
d7e09d03 PT |
225 | } |
226 | ||
227 | ||
228 | /** @} lov */ |