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36 * Implementation of cl_page for LOV layer.
38 * Author: Nikita Danilov <nikita.danilov@sun.com>
39 * Author: Jinshan Xiong <jinshan.xiong@intel.com>
42 #define DEBUG_SUBSYSTEM S_LOV
44 #include "lov_cl_internal.h"
50 /*****************************************************************************
52 * Lov page operations.
56 static int lov_page_invariant(const struct cl_page_slice *slice)
58 const struct cl_page *page = slice->cpl_page;
59 const struct cl_page *sub = lov_sub_page(slice);
61 return ergo(sub != NULL,
62 page->cp_child == sub &&
63 sub->cp_parent == page &&
64 page->cp_state == sub->cp_state);
67 static void lov_page_fini(const struct lu_env *env,
68 struct cl_page_slice *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);
85 static int lov_page_own(const struct lu_env *env,
86 const struct cl_page_slice *slice, struct cl_io *io,
89 struct lov_io *lio = lov_env_io(env);
90 struct lov_io_sub *sub;
92 LINVRNT(lov_page_invariant(slice));
93 LINVRNT(!cl2lov_page(slice)->lps_invalid);
96 sub = lov_page_subio(env, lio, slice);
98 lov_sub_page(slice)->cp_owner = sub->sub_io;
105 static void lov_page_assume(const struct lu_env *env,
106 const struct cl_page_slice *slice, struct cl_io *io)
108 lov_page_own(env, slice, io, 0);
111 static int lov_page_cache_add(const struct lu_env *env,
112 const struct cl_page_slice *slice,
115 struct lov_io *lio = lov_env_io(env);
116 struct lov_io_sub *sub;
119 LINVRNT(lov_page_invariant(slice));
120 LINVRNT(!cl2lov_page(slice)->lps_invalid);
123 sub = lov_page_subio(env, lio, slice);
125 rc = cl_page_cache_add(sub->sub_env, sub->sub_io,
126 slice->cpl_page->cp_child, CRT_WRITE);
130 CL_PAGE_DEBUG(D_ERROR, env, slice->cpl_page, "rc = %d\n", rc);
135 static int lov_page_print(const struct lu_env *env,
136 const struct cl_page_slice *slice,
137 void *cookie, lu_printer_t printer)
139 struct lov_page *lp = cl2lov_page(slice);
141 return (*printer)(env, cookie, LUSTRE_LOV_NAME"-page@%p\n", lp);
144 static const struct cl_page_operations lov_page_ops = {
145 .cpo_fini = lov_page_fini,
146 .cpo_own = lov_page_own,
147 .cpo_assume = lov_page_assume,
150 .cpo_cache_add = lov_page_cache_add
153 .cpo_print = lov_page_print
156 static void lov_empty_page_fini(const struct lu_env *env,
157 struct cl_page_slice *slice)
159 LASSERT(slice->cpl_page->cp_child == NULL);
162 int lov_page_init_raid0(const struct lu_env *env, struct cl_object *obj,
163 struct cl_page *page, struct page *vmpage)
165 struct lov_object *loo = cl2lov(obj);
166 struct lov_layout_raid0 *r0 = lov_r0(loo);
167 struct lov_io *lio = lov_env_io(env);
168 struct cl_page *subpage;
169 struct cl_object *subobj;
170 struct lov_io_sub *sub;
171 struct lov_page *lpg = cl_object_page_slice(obj, page);
178 offset = cl_offset(obj, page->cp_index);
179 stripe = lov_stripe_number(loo->lo_lsm, offset);
180 LASSERT(stripe < r0->lo_nr);
181 rc = lov_stripe_offset(loo->lo_lsm, offset, stripe,
185 lpg->lps_invalid = 1;
186 cl_page_slice_add(page, &lpg->lps_cl, obj, &lov_page_ops);
188 sub = lov_sub_get(env, lio, stripe);
190 RETURN(PTR_ERR(sub));
192 subobj = lovsub2cl(r0->lo_sub[stripe]);
193 subpage = cl_page_alloc(sub->sub_env, subobj, cl_index(subobj, suboff),
194 vmpage, page->cp_type);
195 if (!IS_ERR(subpage)) {
196 subpage->cp_parent = page;
197 page->cp_child = subpage;
198 lpg->lps_invalid = 0;
200 rc = PTR_ERR(subpage);
205 static const struct cl_page_operations lov_empty_page_ops = {
206 .cpo_fini = lov_empty_page_fini,
207 .cpo_print = lov_page_print
210 int lov_page_init_empty(const struct lu_env *env, struct cl_object *obj,
211 struct cl_page *page, struct page *vmpage)
213 struct lov_page *lpg = cl_object_page_slice(obj, page);
217 cl_page_slice_add(page, &lpg->lps_cl, obj, &lov_empty_page_ops);
219 memset(addr, 0, cl_page_size(obj));
221 cl_page_export(env, page, 1);