diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/llite/vvp_page.c')
-rw-r--r-- | drivers/staging/lustre/lustre/llite/vvp_page.c | 523 |
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; -} |