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23 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
31 * Implementation of cl_page for LOV layer.
33 * Author: Nikita Danilov <nikita.danilov@sun.com>
34 * Author: Jinshan Xiong <jinshan.xiong@intel.com>
37 #define DEBUG_SUBSYSTEM S_LOV
39 #include "lov_cl_internal.h"
45 /*****************************************************************************
47 * Lov page operations.
51 static int lov_comp_page_print(const struct lu_env *env,
52 const struct cl_page_slice *slice,
53 void *cookie, lu_printer_t printer)
55 struct lov_page *lp = cl2lov_page(slice);
57 return (*printer)(env, cookie,
58 LUSTRE_LOV_NAME"-page@%p, gen: %u\n",
59 lp, lp->lps_layout_gen);
62 static const struct cl_page_operations lov_comp_page_ops = {
63 .cpo_print = lov_comp_page_print
66 int lov_page_init_composite(const struct lu_env *env, struct cl_object *obj,
67 struct cl_page *page, pgoff_t index)
69 struct lov_object *loo = cl2lov(obj);
70 struct lov_io *lio = lov_env_io(env);
71 struct cl_object *subobj;
73 struct lov_io_sub *sub;
74 struct lov_page *lpg = cl_object_page_slice(obj, page);
75 struct lov_layout_raid0 *r0;
84 offset = cl_offset(obj, index);
85 entry = lov_io_layout_at(lio, offset);
86 if (entry < 0 || !lsm_entry_inited(loo->lo_lsm, entry)) {
87 /* non-existing layout component */
88 lov_page_init_empty(env, obj, page, index);
92 r0 = lov_r0(loo, entry);
93 stripe = lov_stripe_number(loo->lo_lsm, entry, offset);
94 LASSERT(stripe < r0->lo_nr);
95 rc = lov_stripe_offset(loo->lo_lsm, entry, offset, stripe, &suboff);
98 page->cp_lov_index = lov_comp_index(entry, stripe);
99 lpg->lps_layout_gen = loo->lo_lsm->lsm_layout_gen;
100 cl_page_slice_add(page, &lpg->lps_cl, obj, &lov_comp_page_ops);
102 sub = lov_sub_get(env, lio, page->cp_lov_index);
104 RETURN(PTR_ERR(sub));
106 subobj = lovsub2cl(r0->lo_sub[stripe]);
107 cl_object_for_each(o, subobj) {
108 if (o->co_ops->coo_page_init) {
109 rc = o->co_ops->coo_page_init(sub->sub_env, o, page,
110 cl_index(subobj, suboff));
119 static int lov_empty_page_print(const struct lu_env *env,
120 const struct cl_page_slice *slice,
121 void *cookie, lu_printer_t printer)
123 struct lov_page *lp = cl2lov_page(slice);
125 return (*printer)(env, cookie, LUSTRE_LOV_NAME"-page@%p, empty.\n", lp);
128 static const struct cl_page_operations lov_empty_page_ops = {
129 .cpo_print = lov_empty_page_print
132 int lov_page_init_empty(const struct lu_env *env, struct cl_object *obj,
133 struct cl_page *page, pgoff_t index)
135 struct lov_page *lpg = cl_object_page_slice(obj, page);
140 page->cp_lov_index = ~0;
141 cl_page_slice_add(page, &lpg->lps_cl, obj, &lov_empty_page_ops);
142 addr = kmap(page->cp_vmpage);
143 memset(addr, 0, cl_page_size(obj));
144 kunmap(page->cp_vmpage);
145 cl_page_export(env, page, 1);
149 int lov_page_init_foreign(const struct lu_env *env, struct cl_object *obj,
150 struct cl_page *page, pgoff_t index)
152 CDEBUG(D_PAGE, DFID" has no data\n", PFID(lu_object_fid(&obj->co_lu)));
156 bool lov_page_is_empty(const struct cl_page *page)
158 const struct cl_page_slice *slice = cl_page_at(page, &lov_device_type);
160 LASSERT(slice != NULL);
161 return slice->cpl_ops == &lov_empty_page_ops;