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/*
* 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.gnu.org/licenses/gpl-2.0.html
*
* GPL HEADER END
*/
/*
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2011, 2015, 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>
* Author: Jinshan Xiong <jinshan.xiong@intel.com>
*/
#define DEBUG_SUBSYSTEM S_LOV
#include "lov_cl_internal.h"
/** \addtogroup lov
* @{
*/
/*****************************************************************************
*
* Lov page operations.
*
*/
/**
* Adjust the stripe index by layout of raid0. @max_index is the maximum
* page index covered by an underlying DLM lock.
* This function converts max_index from stripe level to file level, and make
* sure it's not beyond one stripe.
*/
static int lov_raid0_page_is_under_lock(const struct lu_env *env,
const struct cl_page_slice *slice,
struct cl_io *unused,
pgoff_t *max_index)
{
struct lov_object *loo = cl2lov(slice->cpl_obj);
struct lov_layout_raid0 *r0 = lov_r0(loo);
pgoff_t index = *max_index;
unsigned int pps; /* pages per stripe */
CDEBUG(D_READA, "*max_index = %lu, nr = %d\n", index, r0->lo_nr);
if (index == 0) /* the page is not covered by any lock */
return 0;
if (r0->lo_nr == 1) /* single stripe file */
return 0;
/* max_index is stripe level, convert it into file level */
if (index != CL_PAGE_EOF) {
int stripeno = lov_page_stripe(slice->cpl_page);
*max_index = lov_stripe_pgoff(loo->lo_lsm, index, stripeno);
}
/* calculate the end of current stripe */
pps = loo->lo_lsm->lsm_stripe_size >> PAGE_SHIFT;
index = ((slice->cpl_index + pps) & ~(pps - 1)) - 1;
/* never exceed the end of the stripe */
*max_index = min_t(pgoff_t, *max_index, index);
return 0;
}
static int lov_raid0_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, raid0\n", lp);
}
static const struct cl_page_operations lov_raid0_page_ops = {
.cpo_is_under_lock = lov_raid0_page_is_under_lock,
.cpo_print = lov_raid0_page_print
};
int lov_page_init_raid0(const struct lu_env *env, struct cl_object *obj,
struct cl_page *page, pgoff_t index)
{
struct lov_object *loo = cl2lov(obj);
struct lov_layout_raid0 *r0 = lov_r0(loo);
struct lov_io *lio = lov_env_io(env);
struct cl_object *subobj;
struct cl_object *o;
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, 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);
cl_page_slice_add(page, &lpg->lps_cl, obj, index, &lov_raid0_page_ops);
sub = lov_sub_get(env, lio, stripe);
if (IS_ERR(sub))
return PTR_ERR(sub);
subobj = lovsub2cl(r0->lo_sub[stripe]);
list_for_each_entry(o, &subobj->co_lu.lo_header->loh_layers,
co_lu.lo_linkage) {
if (o->co_ops->coo_page_init) {
rc = o->co_ops->coo_page_init(sub->sub_env, o, page,
cl_index(subobj, suboff));
if (rc != 0)
break;
}
}
lov_sub_put(sub);
return rc;
}
static int lov_empty_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, empty.\n",
lp);
}
static const struct cl_page_operations lov_empty_page_ops = {
.cpo_print = lov_empty_page_print
};
int lov_page_init_empty(const struct lu_env *env, struct cl_object *obj,
struct cl_page *page, pgoff_t index)
{
struct lov_page *lpg = cl_object_page_slice(obj, page);
void *addr;
cl_page_slice_add(page, &lpg->lps_cl, obj, index, &lov_empty_page_ops);
addr = kmap(page->cp_vmpage);
memset(addr, 0, cl_page_size(obj));
kunmap(page->cp_vmpage);
cl_page_export(env, page, 1);
return 0;
}
/** @} lov */
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