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29 * This file is part of Lustre, http://www.lustre.org/
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32 * Implementation of cl_page for LOV layer.
34 * Author: Nikita Danilov <nikita.danilov@sun.com>
35 * Author: Jinshan Xiong <jinshan.xiong@intel.com>
38 #define DEBUG_SUBSYSTEM S_LOV
40 #include "lov_cl_internal.h"
46 /*****************************************************************************
48 * Lov page operations.
52 static int lov_raid0_page_print(const struct lu_env *env,
53 const struct cl_page_slice *slice,
54 void *cookie, lu_printer_t printer)
56 struct lov_page *lp = cl2lov_page(slice);
58 return (*printer)(env, cookie, LUSTRE_LOV_NAME "-page@%p, raid0\n", lp);
61 static const struct cl_page_operations lov_raid0_page_ops = {
62 .cpo_print = lov_raid0_page_print
65 int lov_page_init_raid0(const struct lu_env *env, struct cl_object *obj,
66 struct cl_page *page, pgoff_t index)
68 struct lov_object *loo = cl2lov(obj);
69 struct lov_layout_raid0 *r0 = lov_r0(loo);
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);
80 offset = cl_offset(obj, index);
81 stripe = lov_stripe_number(loo->lo_lsm, offset);
82 LASSERT(stripe < r0->lo_nr);
83 rc = lov_stripe_offset(loo->lo_lsm, offset, stripe, &suboff);
86 lpg->lps_stripe = stripe;
87 cl_page_slice_add(page, &lpg->lps_cl, obj, index, &lov_raid0_page_ops);
89 sub = lov_sub_get(env, lio, stripe);
93 subobj = lovsub2cl(r0->lo_sub[stripe]);
94 list_for_each_entry(o, &subobj->co_lu.lo_header->loh_layers,
96 if (o->co_ops->coo_page_init) {
97 rc = o->co_ops->coo_page_init(sub->sub_env, o, page,
98 cl_index(subobj, suboff));
107 static int lov_empty_page_print(const struct lu_env *env,
108 const struct cl_page_slice *slice,
109 void *cookie, lu_printer_t printer)
111 struct lov_page *lp = cl2lov_page(slice);
113 return (*printer)(env, cookie, LUSTRE_LOV_NAME "-page@%p, empty.\n",
117 static const struct cl_page_operations lov_empty_page_ops = {
118 .cpo_print = lov_empty_page_print
121 int lov_page_init_empty(const struct lu_env *env, struct cl_object *obj,
122 struct cl_page *page, pgoff_t index)
124 struct lov_page *lpg = cl_object_page_slice(obj, page);
127 cl_page_slice_add(page, &lpg->lps_cl, obj, index, &lov_empty_page_ops);
128 addr = kmap(page->cp_vmpage);
129 memset(addr, 0, cl_page_size(obj));
130 kunmap(page->cp_vmpage);
131 cl_page_export(env, page, 1);