557 lines
15 KiB
C
557 lines
15 KiB
C
/*
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* GPL HEADER START
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 only,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License version 2 for more details (a copy is included
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* in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; If not, see
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* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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* GPL HEADER END
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*/
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/*
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* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
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* Use is subject to license terms.
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*
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* Copyright (c) 2011, 2015, Intel Corporation.
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*/
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/*
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* This file is part of Lustre, http://www.lustre.org/
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* Lustre is a trademark of Sun Microsystems, Inc.
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*
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* Implementation of cl_page for VVP layer.
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*
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* Author: Nikita Danilov <nikita.danilov@sun.com>
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* Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
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*/
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#define DEBUG_SUBSYSTEM S_LLITE
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#include "../include/obd.h"
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#include "../include/lustre_lite.h"
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#include "vvp_internal.h"
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/*****************************************************************************
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*
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* Page operations.
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*
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*/
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static void vvp_page_fini_common(struct ccc_page *cp)
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{
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struct page *vmpage = cp->cpg_page;
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LASSERT(vmpage);
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put_page(vmpage);
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}
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static void vvp_page_fini(const struct lu_env *env,
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struct cl_page_slice *slice)
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{
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struct ccc_page *cp = cl2ccc_page(slice);
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struct page *vmpage = cp->cpg_page;
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/*
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* vmpage->private was already cleared when page was moved into
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* VPG_FREEING state.
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*/
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LASSERT((struct cl_page *)vmpage->private != slice->cpl_page);
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vvp_page_fini_common(cp);
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}
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static int vvp_page_own(const struct lu_env *env,
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const struct cl_page_slice *slice, struct cl_io *io,
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int nonblock)
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{
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struct ccc_page *vpg = cl2ccc_page(slice);
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struct page *vmpage = vpg->cpg_page;
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LASSERT(vmpage);
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if (nonblock) {
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if (!trylock_page(vmpage))
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return -EAGAIN;
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if (unlikely(PageWriteback(vmpage))) {
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unlock_page(vmpage);
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return -EAGAIN;
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}
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return 0;
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}
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lock_page(vmpage);
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wait_on_page_writeback(vmpage);
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return 0;
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}
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static void vvp_page_assume(const struct lu_env *env,
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const struct cl_page_slice *slice,
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struct cl_io *unused)
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{
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struct page *vmpage = cl2vm_page(slice);
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LASSERT(vmpage);
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LASSERT(PageLocked(vmpage));
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wait_on_page_writeback(vmpage);
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}
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static void vvp_page_unassume(const struct lu_env *env,
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const struct cl_page_slice *slice,
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struct cl_io *unused)
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{
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struct page *vmpage = cl2vm_page(slice);
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LASSERT(vmpage);
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LASSERT(PageLocked(vmpage));
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}
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static void vvp_page_disown(const struct lu_env *env,
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const struct cl_page_slice *slice, struct cl_io *io)
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{
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struct page *vmpage = cl2vm_page(slice);
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LASSERT(vmpage);
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LASSERT(PageLocked(vmpage));
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unlock_page(cl2vm_page(slice));
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}
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static void vvp_page_discard(const struct lu_env *env,
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const struct cl_page_slice *slice,
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struct cl_io *unused)
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{
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struct page *vmpage = cl2vm_page(slice);
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struct address_space *mapping;
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struct ccc_page *cpg = cl2ccc_page(slice);
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LASSERT(vmpage);
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LASSERT(PageLocked(vmpage));
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mapping = vmpage->mapping;
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if (cpg->cpg_defer_uptodate && !cpg->cpg_ra_used)
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ll_ra_stats_inc(mapping, RA_STAT_DISCARDED);
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/*
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* truncate_complete_page() calls
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* a_ops->invalidatepage()->cl_page_delete()->vvp_page_delete().
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*/
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truncate_complete_page(mapping, vmpage);
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}
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static int vvp_page_unmap(const struct lu_env *env,
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const struct cl_page_slice *slice,
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struct cl_io *unused)
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{
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struct page *vmpage = cl2vm_page(slice);
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__u64 offset;
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LASSERT(vmpage);
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LASSERT(PageLocked(vmpage));
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offset = vmpage->index << PAGE_SHIFT;
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/*
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* XXX is it safe to call this with the page lock held?
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*/
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ll_teardown_mmaps(vmpage->mapping, offset, offset + PAGE_SIZE);
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return 0;
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}
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static void vvp_page_delete(const struct lu_env *env,
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const struct cl_page_slice *slice)
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{
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struct page *vmpage = cl2vm_page(slice);
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struct inode *inode = vmpage->mapping->host;
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struct cl_object *obj = slice->cpl_obj;
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LASSERT(PageLocked(vmpage));
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LASSERT((struct cl_page *)vmpage->private == slice->cpl_page);
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LASSERT(inode == ccc_object_inode(obj));
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vvp_write_complete(cl2ccc(obj), cl2ccc_page(slice));
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ClearPagePrivate(vmpage);
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vmpage->private = 0;
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/*
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* Reference from vmpage to cl_page is removed, but the reference back
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* is still here. It is removed later in vvp_page_fini().
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*/
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}
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static void vvp_page_export(const struct lu_env *env,
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const struct cl_page_slice *slice,
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int uptodate)
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{
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struct page *vmpage = cl2vm_page(slice);
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LASSERT(vmpage);
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LASSERT(PageLocked(vmpage));
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if (uptodate)
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SetPageUptodate(vmpage);
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else
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ClearPageUptodate(vmpage);
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}
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static int vvp_page_is_vmlocked(const struct lu_env *env,
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const struct cl_page_slice *slice)
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{
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return PageLocked(cl2vm_page(slice)) ? -EBUSY : -ENODATA;
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}
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static int vvp_page_prep_read(const struct lu_env *env,
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const struct cl_page_slice *slice,
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struct cl_io *unused)
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{
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/* Skip the page already marked as PG_uptodate. */
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return PageUptodate(cl2vm_page(slice)) ? -EALREADY : 0;
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}
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static int vvp_page_prep_write(const struct lu_env *env,
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const struct cl_page_slice *slice,
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struct cl_io *unused)
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{
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struct page *vmpage = cl2vm_page(slice);
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struct cl_page *pg = slice->cpl_page;
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LASSERT(PageLocked(vmpage));
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LASSERT(!PageDirty(vmpage));
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/* ll_writepage path is not a sync write, so need to set page writeback
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* flag
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*/
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if (!pg->cp_sync_io)
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set_page_writeback(vmpage);
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vvp_write_pending(cl2ccc(slice->cpl_obj), cl2ccc_page(slice));
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return 0;
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}
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/**
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* Handles page transfer errors at VM level.
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*
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* This takes inode as a separate argument, because inode on which error is to
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* be set can be different from \a vmpage inode in case of direct-io.
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*/
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static void vvp_vmpage_error(struct inode *inode, struct page *vmpage, int ioret)
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{
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struct ccc_object *obj = cl_inode2ccc(inode);
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if (ioret == 0) {
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ClearPageError(vmpage);
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obj->cob_discard_page_warned = 0;
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} else {
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SetPageError(vmpage);
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if (ioret == -ENOSPC)
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set_bit(AS_ENOSPC, &inode->i_mapping->flags);
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else
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set_bit(AS_EIO, &inode->i_mapping->flags);
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if ((ioret == -ESHUTDOWN || ioret == -EINTR) &&
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obj->cob_discard_page_warned == 0) {
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obj->cob_discard_page_warned = 1;
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ll_dirty_page_discard_warn(vmpage, ioret);
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}
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}
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}
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static void vvp_page_completion_read(const struct lu_env *env,
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const struct cl_page_slice *slice,
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int ioret)
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{
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struct ccc_page *cp = cl2ccc_page(slice);
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struct page *vmpage = cp->cpg_page;
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struct cl_page *page = cl_page_top(slice->cpl_page);
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struct inode *inode = ccc_object_inode(page->cp_obj);
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LASSERT(PageLocked(vmpage));
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CL_PAGE_HEADER(D_PAGE, env, page, "completing READ with %d\n", ioret);
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if (cp->cpg_defer_uptodate)
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ll_ra_count_put(ll_i2sbi(inode), 1);
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if (ioret == 0) {
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if (!cp->cpg_defer_uptodate)
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cl_page_export(env, page, 1);
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} else
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cp->cpg_defer_uptodate = 0;
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if (!page->cp_sync_io)
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unlock_page(vmpage);
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}
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static void vvp_page_completion_write(const struct lu_env *env,
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const struct cl_page_slice *slice,
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int ioret)
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{
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struct ccc_page *cp = cl2ccc_page(slice);
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struct cl_page *pg = slice->cpl_page;
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struct page *vmpage = cp->cpg_page;
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CL_PAGE_HEADER(D_PAGE, env, pg, "completing WRITE with %d\n", ioret);
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/*
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* TODO: Actually it makes sense to add the page into oap pending
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* list again and so that we don't need to take the page out from
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* SoM write pending list, if we just meet a recoverable error,
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* -ENOMEM, etc.
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* To implement this, we just need to return a non zero value in
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* ->cpo_completion method. The underlying transfer should be notified
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* and then re-add the page into pending transfer queue. -jay
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*/
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cp->cpg_write_queued = 0;
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vvp_write_complete(cl2ccc(slice->cpl_obj), cp);
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if (pg->cp_sync_io) {
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LASSERT(PageLocked(vmpage));
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LASSERT(!PageWriteback(vmpage));
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} else {
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LASSERT(PageWriteback(vmpage));
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/*
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* Only mark the page error only when it's an async write
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* because applications won't wait for IO to finish.
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*/
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vvp_vmpage_error(ccc_object_inode(pg->cp_obj), vmpage, ioret);
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end_page_writeback(vmpage);
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}
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}
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/**
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* Implements cl_page_operations::cpo_make_ready() method.
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*
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* This is called to yank a page from the transfer cache and to send it out as
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* a part of transfer. This function try-locks the page. If try-lock failed,
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* page is owned by some concurrent IO, and should be skipped (this is bad,
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* but hopefully rare situation, as it usually results in transfer being
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* shorter than possible).
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*
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* \retval 0 success, page can be placed into transfer
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*
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* \retval -EAGAIN page is either used by concurrent IO has been
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* truncated. Skip it.
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*/
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static int vvp_page_make_ready(const struct lu_env *env,
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const struct cl_page_slice *slice)
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{
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struct page *vmpage = cl2vm_page(slice);
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struct cl_page *pg = slice->cpl_page;
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int result = 0;
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lock_page(vmpage);
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if (clear_page_dirty_for_io(vmpage)) {
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LASSERT(pg->cp_state == CPS_CACHED);
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/* This actually clears the dirty bit in the radix tree. */
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set_page_writeback(vmpage);
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vvp_write_pending(cl2ccc(slice->cpl_obj), cl2ccc_page(slice));
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CL_PAGE_HEADER(D_PAGE, env, pg, "readied\n");
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} else if (pg->cp_state == CPS_PAGEOUT) {
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/* is it possible for osc_flush_async_page() to already
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* make it ready?
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*/
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result = -EALREADY;
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} else {
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CL_PAGE_DEBUG(D_ERROR, env, pg, "Unexpecting page state %d.\n",
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pg->cp_state);
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LBUG();
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}
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unlock_page(vmpage);
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return result;
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}
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static int vvp_page_print(const struct lu_env *env,
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const struct cl_page_slice *slice,
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void *cookie, lu_printer_t printer)
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{
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struct ccc_page *vp = cl2ccc_page(slice);
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struct page *vmpage = vp->cpg_page;
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(*printer)(env, cookie, LUSTRE_VVP_NAME "-page@%p(%d:%d:%d) vm@%p ",
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vp, vp->cpg_defer_uptodate, vp->cpg_ra_used,
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vp->cpg_write_queued, vmpage);
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if (vmpage) {
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(*printer)(env, cookie, "%lx %d:%d %lx %lu %slru",
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(long)vmpage->flags, page_count(vmpage),
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page_mapcount(vmpage), vmpage->private,
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page_index(vmpage),
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list_empty(&vmpage->lru) ? "not-" : "");
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}
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(*printer)(env, cookie, "\n");
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return 0;
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}
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static const struct cl_page_operations vvp_page_ops = {
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.cpo_own = vvp_page_own,
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.cpo_assume = vvp_page_assume,
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.cpo_unassume = vvp_page_unassume,
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.cpo_disown = vvp_page_disown,
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.cpo_vmpage = ccc_page_vmpage,
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.cpo_discard = vvp_page_discard,
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.cpo_delete = vvp_page_delete,
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.cpo_unmap = vvp_page_unmap,
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.cpo_export = vvp_page_export,
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.cpo_is_vmlocked = vvp_page_is_vmlocked,
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.cpo_fini = vvp_page_fini,
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.cpo_print = vvp_page_print,
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.cpo_is_under_lock = ccc_page_is_under_lock,
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.io = {
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[CRT_READ] = {
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.cpo_prep = vvp_page_prep_read,
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.cpo_completion = vvp_page_completion_read,
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.cpo_make_ready = ccc_fail,
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},
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[CRT_WRITE] = {
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.cpo_prep = vvp_page_prep_write,
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.cpo_completion = vvp_page_completion_write,
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.cpo_make_ready = vvp_page_make_ready,
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}
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}
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};
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static void vvp_transient_page_verify(const struct cl_page *page)
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{
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struct inode *inode = ccc_object_inode(page->cp_obj);
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LASSERT(!inode_trylock(inode));
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}
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static int vvp_transient_page_own(const struct lu_env *env,
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const struct cl_page_slice *slice,
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struct cl_io *unused, int nonblock)
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{
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vvp_transient_page_verify(slice->cpl_page);
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return 0;
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}
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static void vvp_transient_page_assume(const struct lu_env *env,
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const struct cl_page_slice *slice,
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struct cl_io *unused)
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{
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vvp_transient_page_verify(slice->cpl_page);
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}
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static void vvp_transient_page_unassume(const struct lu_env *env,
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const struct cl_page_slice *slice,
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struct cl_io *unused)
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{
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vvp_transient_page_verify(slice->cpl_page);
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}
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static void vvp_transient_page_disown(const struct lu_env *env,
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const struct cl_page_slice *slice,
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struct cl_io *unused)
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{
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vvp_transient_page_verify(slice->cpl_page);
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}
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static void vvp_transient_page_discard(const struct lu_env *env,
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const struct cl_page_slice *slice,
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struct cl_io *unused)
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{
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struct cl_page *page = slice->cpl_page;
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vvp_transient_page_verify(slice->cpl_page);
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/*
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* For transient pages, remove it from the radix tree.
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*/
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cl_page_delete(env, page);
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}
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static int vvp_transient_page_is_vmlocked(const struct lu_env *env,
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const struct cl_page_slice *slice)
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{
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struct inode *inode = ccc_object_inode(slice->cpl_obj);
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int locked;
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locked = !inode_trylock(inode);
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if (!locked)
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inode_unlock(inode);
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return locked ? -EBUSY : -ENODATA;
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}
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static void
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vvp_transient_page_completion(const struct lu_env *env,
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const struct cl_page_slice *slice,
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int ioret)
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{
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vvp_transient_page_verify(slice->cpl_page);
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}
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static void vvp_transient_page_fini(const struct lu_env *env,
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struct cl_page_slice *slice)
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{
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struct ccc_page *cp = cl2ccc_page(slice);
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struct cl_page *clp = slice->cpl_page;
|
|
struct ccc_object *clobj = cl2ccc(clp->cp_obj);
|
|
|
|
vvp_page_fini_common(cp);
|
|
LASSERT(!inode_trylock(clobj->cob_inode));
|
|
clobj->cob_transient_pages--;
|
|
}
|
|
|
|
static const struct cl_page_operations vvp_transient_page_ops = {
|
|
.cpo_own = vvp_transient_page_own,
|
|
.cpo_assume = vvp_transient_page_assume,
|
|
.cpo_unassume = vvp_transient_page_unassume,
|
|
.cpo_disown = vvp_transient_page_disown,
|
|
.cpo_discard = vvp_transient_page_discard,
|
|
.cpo_vmpage = ccc_page_vmpage,
|
|
.cpo_fini = vvp_transient_page_fini,
|
|
.cpo_is_vmlocked = vvp_transient_page_is_vmlocked,
|
|
.cpo_print = vvp_page_print,
|
|
.cpo_is_under_lock = ccc_page_is_under_lock,
|
|
.io = {
|
|
[CRT_READ] = {
|
|
.cpo_prep = ccc_transient_page_prep,
|
|
.cpo_completion = vvp_transient_page_completion,
|
|
},
|
|
[CRT_WRITE] = {
|
|
.cpo_prep = ccc_transient_page_prep,
|
|
.cpo_completion = vvp_transient_page_completion,
|
|
}
|
|
}
|
|
};
|
|
|
|
int vvp_page_init(const struct lu_env *env, struct cl_object *obj,
|
|
struct cl_page *page, struct page *vmpage)
|
|
{
|
|
struct ccc_page *cpg = cl_object_page_slice(obj, page);
|
|
|
|
CLOBINVRNT(env, obj, ccc_object_invariant(obj));
|
|
|
|
cpg->cpg_page = vmpage;
|
|
get_page(vmpage);
|
|
|
|
INIT_LIST_HEAD(&cpg->cpg_pending_linkage);
|
|
if (page->cp_type == CPT_CACHEABLE) {
|
|
SetPagePrivate(vmpage);
|
|
vmpage->private = (unsigned long)page;
|
|
cl_page_slice_add(page, &cpg->cpg_cl, obj, &vvp_page_ops);
|
|
} else {
|
|
struct ccc_object *clobj = cl2ccc(obj);
|
|
|
|
LASSERT(!inode_trylock(clobj->cob_inode));
|
|
cl_page_slice_add(page, &cpg->cpg_cl, obj,
|
|
&vvp_transient_page_ops);
|
|
clobj->cob_transient_pages++;
|
|
}
|
|
return 0;
|
|
}
|