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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_print(const struct lu_env *env,
113 const struct cl_page_slice *slice,
114 void *cookie, lu_printer_t printer)
116 struct lov_page *lp = cl2lov_page(slice);
118 return (*printer)(env, cookie, LUSTRE_LOV_NAME"-page@%p\n", lp);
121 static const struct cl_page_operations lov_page_ops = {
122 .cpo_fini = lov_page_fini,
123 .cpo_own = lov_page_own,
124 .cpo_assume = lov_page_assume,
125 .cpo_print = lov_page_print
128 static void lov_empty_page_fini(const struct lu_env *env,
129 struct cl_page_slice *slice)
131 struct lov_page *lp = cl2lov_page(slice);
133 LASSERT(slice->cpl_page->cp_child == NULL);
135 OBD_SLAB_FREE_PTR(lp, lov_page_kmem);
139 struct cl_page *lov_page_init_raid0(const struct lu_env *env,
140 struct cl_object *obj, struct cl_page *page,
143 struct lov_object *loo = cl2lov(obj);
144 struct lov_layout_raid0 *r0 = lov_r0(loo);
145 struct lov_io *lio = lov_env_io(env);
146 struct cl_page *subpage;
147 struct cl_object *subobj;
148 struct lov_io_sub *sub;
149 struct lov_page *lpg;
150 struct cl_page *result;
157 offset = cl_offset(obj, page->cp_index);
158 stripe = lov_stripe_number(r0->lo_lsm, offset);
159 LASSERT(stripe < r0->lo_nr);
160 rc = lov_stripe_offset(r0->lo_lsm, offset, stripe,
164 OBD_SLAB_ALLOC_PTR_GFP(lpg, lov_page_kmem, CFS_ALLOC_IO);
166 GOTO(out, result = ERR_PTR(-ENOMEM));
168 lpg->lps_invalid = 1;
169 cl_page_slice_add(page, &lpg->lps_cl, obj, &lov_page_ops);
171 sub = lov_sub_get(env, lio, stripe);
173 GOTO(out, result = (struct cl_page *)sub);
175 subobj = lovsub2cl(r0->lo_sub[stripe]);
176 subpage = cl_page_find_sub(sub->sub_env, subobj,
177 cl_index(subobj, suboff), vmpage, page);
180 GOTO(out, result = subpage);
182 if (likely(subpage->cp_parent == page)) {
183 lu_ref_add(&subpage->cp_reference, "lov", page);
184 lpg->lps_invalid = 0;
187 CL_PAGE_DEBUG(D_ERROR, env, page, "parent page\n");
188 CL_PAGE_DEBUG(D_ERROR, env, subpage, "child page\n");
198 static const struct cl_page_operations lov_empty_page_ops = {
199 .cpo_fini = lov_empty_page_fini,
200 .cpo_print = lov_page_print
203 struct cl_page *lov_page_init_empty(const struct lu_env *env,
204 struct cl_object *obj, struct cl_page *page,
207 struct lov_page *lpg;
208 int result = -ENOMEM;
211 OBD_SLAB_ALLOC_PTR_GFP(lpg, lov_page_kmem, CFS_ALLOC_IO);
214 cl_page_slice_add(page, &lpg->lps_cl,
215 obj, &lov_empty_page_ops);
216 addr = cfs_kmap(vmpage);
217 memset(addr, 0, cl_page_size(obj));
219 cl_page_export(env, page, 1);
222 RETURN(ERR_PTR(result));