1 files changed, 0 insertions, 523 deletions
diff --git a/drivers/staging/lustre/lustre/llite/vvp_page.c b/drivers/staging/lustre/lustre/llite/vvp_page.c
deleted file mode 100644
index 6eb0565ddc22..000000000000
--- a/drivers/staging/lustre/lustre/llite/vvp_page.c
+++ /dev/null
@@ -1,523 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * 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 VVP layer.
- *
- *   Author: Nikita Danilov <nikita.danilov@sun.com>
- *   Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
- */
-
-#define DEBUG_SUBSYSTEM S_LLITE
-
-#include <linux/atomic.h>
-#include <linux/bitops.h>
-#include <linux/mm.h>
-#include <linux/mutex.h>
-#include <linux/page-flags.h>
-#include <linux/pagemap.h>
-
-#include "llite_internal.h"
-#include "vvp_internal.h"
-
-/*****************************************************************************
- *
- * Page operations.
- *
- */
-
-static void vvp_page_fini_common(struct vvp_page *vpg)
-{
-	struct page *vmpage = vpg->vpg_page;
-
-	LASSERT(vmpage);
-	put_page(vmpage);
-}
-
-static void vvp_page_fini(const struct lu_env *env,
-			  struct cl_page_slice *slice)
-{
-	struct vvp_page *vpg     = cl2vvp_page(slice);
-	struct page     *vmpage  = vpg->vpg_page;
-
-	/*
-	 * vmpage->private was already cleared when page was moved into
-	 * VPG_FREEING state.
-	 */
-	LASSERT((struct cl_page *)vmpage->private != slice->cpl_page);
-	vvp_page_fini_common(vpg);
-}
-
-static int vvp_page_own(const struct lu_env *env,
-			const struct cl_page_slice *slice, struct cl_io *io,
-			int nonblock)
-{
-	struct vvp_page *vpg    = cl2vvp_page(slice);
-	struct page     *vmpage = vpg->vpg_page;
-
-	LASSERT(vmpage);
-	if (nonblock) {
-		if (!trylock_page(vmpage))
-			return -EAGAIN;
-
-		if (unlikely(PageWriteback(vmpage))) {
-			unlock_page(vmpage);
-			return -EAGAIN;
-		}
-
-		return 0;
-	}
-
-	lock_page(vmpage);
-	wait_on_page_writeback(vmpage);
-
-	return 0;
-}
-
-static void vvp_page_assume(const struct lu_env *env,
-			    const struct cl_page_slice *slice,
-			    struct cl_io *unused)
-{
-	struct page *vmpage = cl2vm_page(slice);
-
-	LASSERT(vmpage);
-	LASSERT(PageLocked(vmpage));
-	wait_on_page_writeback(vmpage);
-}
-
-static void vvp_page_unassume(const struct lu_env *env,
-			      const struct cl_page_slice *slice,
-			      struct cl_io *unused)
-{
-	struct page *vmpage = cl2vm_page(slice);
-
-	LASSERT(vmpage);
-	LASSERT(PageLocked(vmpage));
-}
-
-static void vvp_page_disown(const struct lu_env *env,
-			    const struct cl_page_slice *slice, struct cl_io *io)
-{
-	struct page *vmpage = cl2vm_page(slice);
-
-	LASSERT(vmpage);
-	LASSERT(PageLocked(vmpage));
-
-	unlock_page(cl2vm_page(slice));
-}
-
-static void vvp_page_discard(const struct lu_env *env,
-			     const struct cl_page_slice *slice,
-			     struct cl_io *unused)
-{
-	struct page	   *vmpage  = cl2vm_page(slice);
-	struct vvp_page      *vpg     = cl2vvp_page(slice);
-
-	LASSERT(vmpage);
-	LASSERT(PageLocked(vmpage));
-
-	if (vpg->vpg_defer_uptodate && !vpg->vpg_ra_used)
-		ll_ra_stats_inc(vmpage->mapping->host, RA_STAT_DISCARDED);
-
-	ll_invalidate_page(vmpage);
-}
-
-static void vvp_page_delete(const struct lu_env *env,
-			    const struct cl_page_slice *slice)
-{
-	struct page       *vmpage = cl2vm_page(slice);
-	struct inode     *inode  = vmpage->mapping->host;
-	struct cl_object *obj    = slice->cpl_obj;
-	struct cl_page   *page   = slice->cpl_page;
-	int refc;
-
-	LASSERT(PageLocked(vmpage));
-	LASSERT((struct cl_page *)vmpage->private == page);
-	LASSERT(inode == vvp_object_inode(obj));
-
-	/* Drop the reference count held in vvp_page_init */
-	refc = atomic_dec_return(&page->cp_ref);
-	LASSERTF(refc >= 1, "page = %p, refc = %d\n", page, refc);
-
-	ClearPagePrivate(vmpage);
-	vmpage->private = 0;
-	/*
-	 * Reference from vmpage to cl_page is removed, but the reference back
-	 * is still here. It is removed later in vvp_page_fini().
-	 */
-}
-
-static void vvp_page_export(const struct lu_env *env,
-			    const struct cl_page_slice *slice,
-			    int uptodate)
-{
-	struct page *vmpage = cl2vm_page(slice);
-
-	LASSERT(vmpage);
-	LASSERT(PageLocked(vmpage));
-	if (uptodate)
-		SetPageUptodate(vmpage);
-	else
-		ClearPageUptodate(vmpage);
-}
-
-static int vvp_page_is_vmlocked(const struct lu_env *env,
-				const struct cl_page_slice *slice)
-{
-	return PageLocked(cl2vm_page(slice)) ? -EBUSY : -ENODATA;
-}
-
-static int vvp_page_prep_read(const struct lu_env *env,
-			      const struct cl_page_slice *slice,
-			      struct cl_io *unused)
-{
-	/* Skip the page already marked as PG_uptodate. */
-	return PageUptodate(cl2vm_page(slice)) ? -EALREADY : 0;
-}
-
-static int vvp_page_prep_write(const struct lu_env *env,
-			       const struct cl_page_slice *slice,
-			       struct cl_io *unused)
-{
-	struct page *vmpage = cl2vm_page(slice);
-	struct cl_page *pg = slice->cpl_page;
-
-	LASSERT(PageLocked(vmpage));
-	LASSERT(!PageDirty(vmpage));
-
-	/* ll_writepage path is not a sync write, so need to set page writeback
-	 * flag
-	 */
-	if (!pg->cp_sync_io)
-		set_page_writeback(vmpage);
-
-	return 0;
-}
-
-/**
- * Handles page transfer errors at VM level.
- *
- * This takes inode as a separate argument, because inode on which error is to
- * be set can be different from \a vmpage inode in case of direct-io.
- */
-static void vvp_vmpage_error(struct inode *inode, struct page *vmpage,
-			     int ioret)
-{
-	struct vvp_object *obj = cl_inode2vvp(inode);
-
-	if (ioret == 0) {
-		ClearPageError(vmpage);
-		obj->vob_discard_page_warned = 0;
-	} else {
-		SetPageError(vmpage);
-		mapping_set_error(inode->i_mapping, ioret);
-
-		if ((ioret == -ESHUTDOWN || ioret == -EINTR) &&
-		    obj->vob_discard_page_warned == 0) {
-			obj->vob_discard_page_warned = 1;
-			ll_dirty_page_discard_warn(vmpage, ioret);
-		}
-	}
-}
-
-static void vvp_page_completion_read(const struct lu_env *env,
-				     const struct cl_page_slice *slice,
-				     int ioret)
-{
-	struct vvp_page *vpg    = cl2vvp_page(slice);
-	struct page     *vmpage = vpg->vpg_page;
-	struct cl_page  *page   = slice->cpl_page;
-	struct inode    *inode  = vvp_object_inode(page->cp_obj);
-
-	LASSERT(PageLocked(vmpage));
-	CL_PAGE_HEADER(D_PAGE, env, page, "completing READ with %d\n", ioret);
-
-	if (vpg->vpg_defer_uptodate)
-		ll_ra_count_put(ll_i2sbi(inode), 1);
-
-	if (ioret == 0)  {
-		if (!vpg->vpg_defer_uptodate)
-			cl_page_export(env, page, 1);
-	} else {
-		vpg->vpg_defer_uptodate = 0;
-	}
-
-	if (!page->cp_sync_io)
-		unlock_page(vmpage);
-}
-
-static void vvp_page_completion_write(const struct lu_env *env,
-				      const struct cl_page_slice *slice,
-				      int ioret)
-{
-	struct vvp_page *vpg     = cl2vvp_page(slice);
-	struct cl_page  *pg     = slice->cpl_page;
-	struct page     *vmpage = vpg->vpg_page;
-
-	CL_PAGE_HEADER(D_PAGE, env, pg, "completing WRITE with %d\n", ioret);
-
-	if (pg->cp_sync_io) {
-		LASSERT(PageLocked(vmpage));
-		LASSERT(!PageWriteback(vmpage));
-	} else {
-		LASSERT(PageWriteback(vmpage));
-		/*
-		 * Only mark the page error only when it's an async write
-		 * because applications won't wait for IO to finish.
-		 */
-		vvp_vmpage_error(vvp_object_inode(pg->cp_obj), vmpage, ioret);
-
-		end_page_writeback(vmpage);
-	}
-}
-
-/**
- * Implements cl_page_operations::cpo_make_ready() method.
- *
- * This is called to yank a page from the transfer cache and to send it out as
- * a part of transfer. This function try-locks the page. If try-lock failed,
- * page is owned by some concurrent IO, and should be skipped (this is bad,
- * but hopefully rare situation, as it usually results in transfer being
- * shorter than possible).
- *
- * \retval 0      success, page can be placed into transfer
- *
- * \retval -EAGAIN page is either used by concurrent IO has been
- * truncated. Skip it.
- */
-static int vvp_page_make_ready(const struct lu_env *env,
-			       const struct cl_page_slice *slice)
-{
-	struct page *vmpage = cl2vm_page(slice);
-	struct cl_page *pg = slice->cpl_page;
-	int result = 0;
-
-	lock_page(vmpage);
-	if (clear_page_dirty_for_io(vmpage)) {
-		LASSERT(pg->cp_state == CPS_CACHED);
-		/* This actually clears the dirty bit in the radix tree. */
-		set_page_writeback(vmpage);
-		CL_PAGE_HEADER(D_PAGE, env, pg, "readied\n");
-	} else if (pg->cp_state == CPS_PAGEOUT) {
-		/* is it possible for osc_flush_async_page() to already
-		 * make it ready?
-		 */
-		result = -EALREADY;
-	} else {
-		CL_PAGE_DEBUG(D_ERROR, env, pg, "Unexpecting page state %d.\n",
-			      pg->cp_state);
-		LBUG();
-	}
-	unlock_page(vmpage);
-	return result;
-}
-
-static int vvp_page_print(const struct lu_env *env,
-			  const struct cl_page_slice *slice,
-			  void *cookie, lu_printer_t printer)
-{
-	struct vvp_page *vpg = cl2vvp_page(slice);
-	struct page     *vmpage = vpg->vpg_page;
-
-	(*printer)(env, cookie, LUSTRE_VVP_NAME "-page@%p(%d:%d) vm@%p ",
-		   vpg, vpg->vpg_defer_uptodate, vpg->vpg_ra_used, vmpage);
-	if (vmpage) {
-		(*printer)(env, cookie, "%lx %d:%d %lx %lu %slru",
-			   (long)vmpage->flags, page_count(vmpage),
-			   page_mapcount(vmpage), vmpage->private,
-			   vmpage->index,
-			   list_empty(&vmpage->lru) ? "not-" : "");
-	}
-
-	(*printer)(env, cookie, "\n");
-
-	return 0;
-}
-
-static int vvp_page_fail(const struct lu_env *env,
-			 const struct cl_page_slice *slice)
-{
-	/*
-	 * Cached read?
-	 */
-	LBUG();
-
-	return 0;
-}
-
-static const struct cl_page_operations vvp_page_ops = {
-	.cpo_own	   = vvp_page_own,
-	.cpo_assume	= vvp_page_assume,
-	.cpo_unassume      = vvp_page_unassume,
-	.cpo_disown	= vvp_page_disown,
-	.cpo_discard       = vvp_page_discard,
-	.cpo_delete	= vvp_page_delete,
-	.cpo_export	= vvp_page_export,
-	.cpo_is_vmlocked   = vvp_page_is_vmlocked,
-	.cpo_fini	  = vvp_page_fini,
-	.cpo_print	 = vvp_page_print,
-	.io = {
-		[CRT_READ] = {
-			.cpo_prep	= vvp_page_prep_read,
-			.cpo_completion  = vvp_page_completion_read,
-			.cpo_make_ready = vvp_page_fail,
-		},
-		[CRT_WRITE] = {
-			.cpo_prep	= vvp_page_prep_write,
-			.cpo_completion  = vvp_page_completion_write,
-			.cpo_make_ready  = vvp_page_make_ready,
-		},
-	},
-};
-
-static int vvp_transient_page_prep(const struct lu_env *env,
-				   const struct cl_page_slice *slice,
-				   struct cl_io *unused)
-{
-	/* transient page should always be sent. */
-	return 0;
-}
-
-static int vvp_transient_page_own(const struct lu_env *env,
-				  const struct cl_page_slice *slice,
-				  struct cl_io *unused, int nonblock)
-{
-	return 0;
-}
-
-static void vvp_transient_page_assume(const struct lu_env *env,
-				      const struct cl_page_slice *slice,
-				      struct cl_io *unused)
-{
-}
-
-static void vvp_transient_page_unassume(const struct lu_env *env,
-					const struct cl_page_slice *slice,
-					struct cl_io *unused)
-{
-}
-
-static void vvp_transient_page_disown(const struct lu_env *env,
-				      const struct cl_page_slice *slice,
-				      struct cl_io *unused)
-{
-}
-
-static void vvp_transient_page_discard(const struct lu_env *env,
-				       const struct cl_page_slice *slice,
-				       struct cl_io *unused)
-{
-	struct cl_page *page = slice->cpl_page;
-
-	/*
-	 * For transient pages, remove it from the radix tree.
-	 */
-	cl_page_delete(env, page);
-}
-
-static int vvp_transient_page_is_vmlocked(const struct lu_env *env,
-					  const struct cl_page_slice *slice)
-{
-	struct inode    *inode = vvp_object_inode(slice->cpl_obj);
-	int	locked;
-
-	locked = !inode_trylock(inode);
-	if (!locked)
-		inode_unlock(inode);
-	return locked ? -EBUSY : -ENODATA;
-}
-
-static void
-vvp_transient_page_completion(const struct lu_env *env,
-			      const struct cl_page_slice *slice,
-			      int ioret)
-{
-}
-
-static void vvp_transient_page_fini(const struct lu_env *env,
-				    struct cl_page_slice *slice)
-{
-	struct vvp_page *vpg = cl2vvp_page(slice);
-	struct cl_page *clp = slice->cpl_page;
-	struct vvp_object *clobj = cl2vvp(clp->cp_obj);
-
-	vvp_page_fini_common(vpg);
-	atomic_dec(&clobj->vob_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_fini	  = vvp_transient_page_fini,
-	.cpo_is_vmlocked   = vvp_transient_page_is_vmlocked,
-	.cpo_print	 = vvp_page_print,
-	.io = {
-		[CRT_READ] = {
-			.cpo_prep	= vvp_transient_page_prep,
-			.cpo_completion  = vvp_transient_page_completion,
-		},
-		[CRT_WRITE] = {
-			.cpo_prep	= vvp_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, pgoff_t index)
-{
-	struct vvp_page *vpg = cl_object_page_slice(obj, page);
-	struct page     *vmpage = page->cp_vmpage;
-
-	CLOBINVRNT(env, obj, vvp_object_invariant(obj));
-
-	vpg->vpg_page = vmpage;
-	get_page(vmpage);
-
-	if (page->cp_type == CPT_CACHEABLE) {
-		/* in cache, decref in vvp_page_delete */
-		atomic_inc(&page->cp_ref);
-		SetPagePrivate(vmpage);
-		vmpage->private = (unsigned long)page;
-		cl_page_slice_add(page, &vpg->vpg_cl, obj, index,
-				  &vvp_page_ops);
-	} else {
-		struct vvp_object *clobj = cl2vvp(obj);
-
-		cl_page_slice_add(page, &vpg->vpg_cl, obj, index,
-				  &vvp_transient_page_ops);
-		atomic_inc(&clobj->vob_transient_pages);
-	}
-	return 0;
-}