--- /dev/null
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * Implementation of cl_page for LOV layer.
+ *
+ * Author: Nikita Danilov <nikita.danilov@sun.com>
+ */
+
+#define DEBUG_SUBSYSTEM S_LOV
+
+#include "lov_cl_internal.h"
+
+/** \addtogroup lov
+ * @{
+ */
+
+/*****************************************************************************
+ *
+ * Lov page operations.
+ *
+ */
+
+static int lov_page_invariant(const struct cl_page_slice *slice)
+{
+ const struct cl_page *page = slice->cpl_page;
+ const struct cl_page *sub = lov_sub_page(slice);
+
+ return ergo(sub != NULL,
+ page->cp_child == sub &&
+ sub->cp_parent == page &&
+ page->cp_state == sub->cp_state);
+}
+
+static void lov_page_fini(const struct lu_env *env,
+ struct cl_page_slice *slice)
+{
+ struct cl_page *sub = lov_sub_page(slice);
+
+ LINVRNT(lov_page_invariant(slice));
+
+ if (sub != NULL) {
+ LASSERT(sub->cp_state == CPS_FREEING);
+ lu_ref_del(&sub->cp_reference, "lov", sub->cp_parent);
+ sub->cp_parent = NULL;
+ slice->cpl_page->cp_child = NULL;
+ cl_page_put(env, sub);
+ }
+}
+
+static int lov_page_own(const struct lu_env *env,
+ const struct cl_page_slice *slice, struct cl_io *io,
+ int nonblock)
+{
+ struct lov_io *lio = lov_env_io(env);
+ struct lov_io_sub *sub;
+
+ LINVRNT(lov_page_invariant(slice));
+ LINVRNT(!cl2lov_page(slice)->lps_invalid);
+
+ sub = lov_page_subio(env, lio, slice);
+ if (!IS_ERR(sub)) {
+ lov_sub_page(slice)->cp_owner = sub->sub_io;
+ lov_sub_put(sub);
+ } else
+ LBUG(); /* Arrgh */
+ return 0;
+}
+
+static void lov_page_assume(const struct lu_env *env,
+ const struct cl_page_slice *slice, struct cl_io *io)
+{
+ lov_page_own(env, slice, io, 0);
+}
+
+static int lov_page_cache_add(const struct lu_env *env,
+ const struct cl_page_slice *slice,
+ struct cl_io *io)
+{
+ struct lov_io *lio = lov_env_io(env);
+ struct lov_io_sub *sub;
+ int rc = 0;
+
+ LINVRNT(lov_page_invariant(slice));
+ LINVRNT(!cl2lov_page(slice)->lps_invalid);
+
+ sub = lov_page_subio(env, lio, slice);
+ if (!IS_ERR(sub)) {
+ rc = cl_page_cache_add(sub->sub_env, sub->sub_io,
+ slice->cpl_page->cp_child, CRT_WRITE);
+ lov_sub_put(sub);
+ } else {
+ rc = PTR_ERR(sub);
+ CL_PAGE_DEBUG(D_ERROR, env, slice->cpl_page, "rc = %d\n", rc);
+ }
+ return rc;
+}
+
+static int lov_page_print(const struct lu_env *env,
+ const struct cl_page_slice *slice,
+ void *cookie, lu_printer_t printer)
+{
+ struct lov_page *lp = cl2lov_page(slice);
+
+ return (*printer)(env, cookie, LUSTRE_LOV_NAME"-page@%p\n", lp);
+}
+
+static const struct cl_page_operations lov_page_ops = {
+ .cpo_fini = lov_page_fini,
+ .cpo_own = lov_page_own,
+ .cpo_assume = lov_page_assume,
+ .io = {
+ [CRT_WRITE] = {
+ .cpo_cache_add = lov_page_cache_add
+ }
+ },
+ .cpo_print = lov_page_print
+};
+
+static void lov_empty_page_fini(const struct lu_env *env,
+ struct cl_page_slice *slice)
+{
+ LASSERT(slice->cpl_page->cp_child == NULL);
+}
+
+int lov_page_init_raid0(const struct lu_env *env, struct cl_object *obj,
+ struct cl_page *page, struct page *vmpage)
+{
+ struct lov_object *loo = cl2lov(obj);
+ struct lov_layout_raid0 *r0 = lov_r0(loo);
+ struct lov_io *lio = lov_env_io(env);
+ struct cl_page *subpage;
+ struct cl_object *subobj;
+ struct lov_io_sub *sub;
+ struct lov_page *lpg = cl_object_page_slice(obj, page);
+ loff_t offset;
+ u64 suboff;
+ int stripe;
+ int rc;
+
+ offset = cl_offset(obj, page->cp_index);
+ stripe = lov_stripe_number(loo->lo_lsm, offset);
+ LASSERT(stripe < r0->lo_nr);
+ rc = lov_stripe_offset(loo->lo_lsm, offset, stripe,
+ &suboff);
+ LASSERT(rc == 0);
+
+ lpg->lps_invalid = 1;
+ cl_page_slice_add(page, &lpg->lps_cl, obj, &lov_page_ops);
+
+ sub = lov_sub_get(env, lio, stripe);
+ if (IS_ERR(sub)) {
+ rc = PTR_ERR(sub);
+ goto out;
+ }
+
+ subobj = lovsub2cl(r0->lo_sub[stripe]);
+ subpage = cl_page_find_sub(sub->sub_env, subobj,
+ cl_index(subobj, suboff), vmpage, page);
+ lov_sub_put(sub);
+ if (IS_ERR(subpage)) {
+ rc = PTR_ERR(subpage);
+ goto out;
+ }
+
+ if (likely(subpage->cp_parent == page)) {
+ lu_ref_add(&subpage->cp_reference, "lov", page);
+ lpg->lps_invalid = 0;
+ rc = 0;
+ } else {
+ CL_PAGE_DEBUG(D_ERROR, env, page, "parent page\n");
+ CL_PAGE_DEBUG(D_ERROR, env, subpage, "child page\n");
+ LASSERT(0);
+ }
+
+out:
+ return rc;
+}
+
+
+static const struct cl_page_operations lov_empty_page_ops = {
+ .cpo_fini = lov_empty_page_fini,
+ .cpo_print = lov_page_print
+};
+
+int lov_page_init_empty(const struct lu_env *env, struct cl_object *obj,
+ struct cl_page *page, struct page *vmpage)
+{
+ struct lov_page *lpg = cl_object_page_slice(obj, page);
+ void *addr;
+
+ cl_page_slice_add(page, &lpg->lps_cl, obj, &lov_empty_page_ops);
+ addr = kmap(vmpage);
+ memset(addr, 0, cl_page_size(obj));
+ kunmap(vmpage);
+ cl_page_export(env, page, 1);
+ return 0;
+}
+
+
+/** @} lov */
Code Review / kvmfornfv.git / blobdiff