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27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
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30 * Copyright (c) 2011, Whamcloud, Inc.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * Implementation of cl_page for LOV layer.
38 * Author: Nikita Danilov <nikita.danilov@sun.com>
41 #define DEBUG_SUBSYSTEM S_LOV
43 #include "lov_cl_internal.h"
49 /*****************************************************************************
51 * Lov page operations.
55 static int lov_page_invariant(const struct cl_page_slice *slice)
57 const struct cl_page *page = slice->cpl_page;
58 const struct cl_page *sub = lov_sub_page(slice);
60 return ergo(sub != NULL,
61 page->cp_child == sub &&
62 sub->cp_parent == page &&
63 page->cp_state == sub->cp_state);
66 static void lov_page_fini(const struct lu_env *env,
67 struct cl_page_slice *slice)
69 struct lov_page *lp = cl2lov_page(slice);
70 struct cl_page *sub = lov_sub_page(slice);
72 LINVRNT(lov_page_invariant(slice));
76 LASSERT(sub->cp_state == CPS_FREEING);
77 lu_ref_del(&sub->cp_reference, "lov", sub->cp_parent);
78 sub->cp_parent = NULL;
79 slice->cpl_page->cp_child = NULL;
80 cl_page_put(env, sub);
82 OBD_SLAB_FREE_PTR(lp, lov_page_kmem);
86 static int lov_page_own(const struct lu_env *env,
87 const struct cl_page_slice *slice, struct cl_io *io,
90 struct lov_io *lio = lov_env_io(env);
91 struct lov_io_sub *sub;
93 LINVRNT(lov_page_invariant(slice));
94 LINVRNT(!cl2lov_page(slice)->lps_invalid);
97 sub = lov_page_subio(env, lio, slice);
99 lov_sub_page(slice)->cp_owner = sub->sub_io;
106 static void lov_page_assume(const struct lu_env *env,
107 const struct cl_page_slice *slice, struct cl_io *io)
109 lov_page_own(env, slice, io, 0);
112 static int lov_page_cache_add(const struct lu_env *env,
113 const struct cl_page_slice *slice,
116 struct lov_io *lio = lov_env_io(env);
117 struct lov_io_sub *sub;
120 LINVRNT(lov_page_invariant(slice));
121 LINVRNT(!cl2lov_page(slice)->lps_invalid);
124 sub = lov_page_subio(env, lio, slice);
126 rc = cl_page_cache_add(sub->sub_env, sub->sub_io,
127 slice->cpl_page->cp_child, CRT_WRITE);
131 CL_PAGE_DEBUG(D_ERROR, env, slice->cpl_page, "rc = %d\n", rc);
136 static int lov_page_print(const struct lu_env *env,
137 const struct cl_page_slice *slice,
138 void *cookie, lu_printer_t printer)
140 struct lov_page *lp = cl2lov_page(slice);
142 return (*printer)(env, cookie, LUSTRE_LOV_NAME"-page@%p\n", lp);
145 static const struct cl_page_operations lov_page_ops = {
146 .cpo_fini = lov_page_fini,
147 .cpo_own = lov_page_own,
148 .cpo_assume = lov_page_assume,
151 .cpo_cache_add = lov_page_cache_add
154 .cpo_print = lov_page_print
157 static void lov_empty_page_fini(const struct lu_env *env,
158 struct cl_page_slice *slice)
160 struct lov_page *lp = cl2lov_page(slice);
162 LASSERT(slice->cpl_page->cp_child == NULL);
164 OBD_SLAB_FREE_PTR(lp, lov_page_kmem);
168 struct cl_page *lov_page_init_raid0(const struct lu_env *env,
169 struct cl_object *obj, struct cl_page *page,
172 struct lov_object *loo = cl2lov(obj);
173 struct lov_layout_raid0 *r0 = lov_r0(loo);
174 struct lov_io *lio = lov_env_io(env);
175 struct cl_page *subpage;
176 struct cl_object *subobj;
177 struct lov_io_sub *sub;
178 struct lov_page *lpg;
179 struct cl_page *result;
186 offset = cl_offset(obj, page->cp_index);
187 stripe = lov_stripe_number(r0->lo_lsm, offset);
188 LASSERT(stripe < r0->lo_nr);
189 rc = lov_stripe_offset(r0->lo_lsm, offset, stripe,
193 OBD_SLAB_ALLOC_PTR_GFP(lpg, lov_page_kmem, CFS_ALLOC_IO);
195 GOTO(out, result = ERR_PTR(-ENOMEM));
197 lpg->lps_invalid = 1;
198 cl_page_slice_add(page, &lpg->lps_cl, obj, &lov_page_ops);
200 sub = lov_sub_get(env, lio, stripe);
202 GOTO(out, result = (struct cl_page *)sub);
204 subobj = lovsub2cl(r0->lo_sub[stripe]);
205 subpage = cl_page_find_sub(sub->sub_env, subobj,
206 cl_index(subobj, suboff), vmpage, page);
209 GOTO(out, result = subpage);
211 if (likely(subpage->cp_parent == page)) {
212 lu_ref_add(&subpage->cp_reference, "lov", page);
213 lpg->lps_invalid = 0;
216 CL_PAGE_DEBUG(D_ERROR, env, page, "parent page\n");
217 CL_PAGE_DEBUG(D_ERROR, env, subpage, "child page\n");
227 static const struct cl_page_operations lov_empty_page_ops = {
228 .cpo_fini = lov_empty_page_fini,
229 .cpo_print = lov_page_print
232 struct cl_page *lov_page_init_empty(const struct lu_env *env,
233 struct cl_object *obj, struct cl_page *page,
236 struct lov_page *lpg;
237 int result = -ENOMEM;
240 OBD_SLAB_ALLOC_PTR_GFP(lpg, lov_page_kmem, CFS_ALLOC_IO);
243 cl_page_slice_add(page, &lpg->lps_cl,
244 obj, &lov_empty_page_ops);
245 addr = cfs_kmap(vmpage);
246 memset(addr, 0, cl_page_size(obj));
248 cl_page_export(env, page, 1);
251 RETURN(ERR_PTR(result));