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Diffstat (limited to 'drivers/staging/lustre/lustre/llite/vvp_page.c')
-rw-r--r--drivers/staging/lustre/lustre/llite/vvp_page.c558
1 files changed, 558 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/llite/vvp_page.c b/drivers/staging/lustre/lustre/llite/vvp_page.c
new file mode 100644
index 000000000000..4568e69bb9f0
--- /dev/null
+++ b/drivers/staging/lustre/lustre/llite/vvp_page.c
@@ -0,0 +1,558 @@
+/*
+ * 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 VVP layer.
+ *
+ * Author: Nikita Danilov <nikita.danilov@sun.com>
+ * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
+ */
+
+#define DEBUG_SUBSYSTEM S_LLITE
+
+
+#include <obd.h>
+#include <lustre_lite.h>
+
+#include "vvp_internal.h"
+
+/*****************************************************************************
+ *
+ * Page operations.
+ *
+ */
+
+static void vvp_page_fini_common(struct ccc_page *cp)
+{
+ struct page *vmpage = cp->cpg_page;
+
+ LASSERT(vmpage != NULL);
+ page_cache_release(vmpage);
+}
+
+static void vvp_page_fini(const struct lu_env *env,
+ struct cl_page_slice *slice)
+{
+ struct ccc_page *cp = cl2ccc_page(slice);
+ struct page *vmpage = cp->cpg_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(cp);
+}
+
+static int vvp_page_own(const struct lu_env *env,
+ const struct cl_page_slice *slice, struct cl_io *io,
+ int nonblock)
+{
+ struct ccc_page *vpg = cl2ccc_page(slice);
+ struct page *vmpage = vpg->cpg_page;
+
+ LASSERT(vmpage != NULL);
+ 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 != NULL);
+ 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 != NULL);
+ 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 != NULL);
+ 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 address_space *mapping;
+ struct ccc_page *cpg = cl2ccc_page(slice);
+
+ LASSERT(vmpage != NULL);
+ LASSERT(PageLocked(vmpage));
+
+ mapping = vmpage->mapping;
+
+ if (cpg->cpg_defer_uptodate && !cpg->cpg_ra_used)
+ ll_ra_stats_inc(mapping, RA_STAT_DISCARDED);
+
+ /*
+ * truncate_complete_page() calls
+ * a_ops->invalidatepage()->cl_page_delete()->vvp_page_delete().
+ */
+ truncate_complete_page(mapping, vmpage);
+}
+
+static int vvp_page_unmap(const struct lu_env *env,
+ const struct cl_page_slice *slice,
+ struct cl_io *unused)
+{
+ struct page *vmpage = cl2vm_page(slice);
+ __u64 offset;
+
+ LASSERT(vmpage != NULL);
+ LASSERT(PageLocked(vmpage));
+
+ offset = vmpage->index << PAGE_CACHE_SHIFT;
+
+ /*
+ * XXX is it safe to call this with the page lock held?
+ */
+ ll_teardown_mmaps(vmpage->mapping, offset, offset + PAGE_CACHE_SIZE);
+ return 0;
+}
+
+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;
+
+ LASSERT(PageLocked(vmpage));
+ LASSERT((struct cl_page *)vmpage->private == slice->cpl_page);
+ LASSERT(inode == ccc_object_inode(obj));
+
+ vvp_write_complete(cl2ccc(obj), cl2ccc_page(slice));
+ 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 != NULL);
+ 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)
+{
+ ENTRY;
+ /* 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);
+
+ LASSERT(PageLocked(vmpage));
+ LASSERT(!PageDirty(vmpage));
+
+ set_page_writeback(vmpage);
+ vvp_write_pending(cl2ccc(slice->cpl_obj), cl2ccc_page(slice));
+
+ 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 ccc_object *obj = cl_inode2ccc(inode);
+
+ if (ioret == 0) {
+ ClearPageError(vmpage);
+ obj->cob_discard_page_warned = 0;
+ } else {
+ SetPageError(vmpage);
+ if (ioret == -ENOSPC)
+ set_bit(AS_ENOSPC, &inode->i_mapping->flags);
+ else
+ set_bit(AS_EIO, &inode->i_mapping->flags);
+
+ if ((ioret == -ESHUTDOWN || ioret == -EINTR) &&
+ obj->cob_discard_page_warned == 0) {
+ obj->cob_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 ccc_page *cp = cl2ccc_page(slice);
+ struct page *vmpage = cp->cpg_page;
+ struct cl_page *page = cl_page_top(slice->cpl_page);
+ struct inode *inode = ccc_object_inode(page->cp_obj);
+ ENTRY;
+
+ LASSERT(PageLocked(vmpage));
+ CL_PAGE_HEADER(D_PAGE, env, page, "completing READ with %d\n", ioret);
+
+ if (cp->cpg_defer_uptodate)
+ ll_ra_count_put(ll_i2sbi(inode), 1);
+
+ if (ioret == 0) {
+ if (!cp->cpg_defer_uptodate)
+ cl_page_export(env, page, 1);
+ } else
+ cp->cpg_defer_uptodate = 0;
+
+ if (page->cp_sync_io == NULL)
+ unlock_page(vmpage);
+
+ EXIT;
+}
+
+static void vvp_page_completion_write(const struct lu_env *env,
+ const struct cl_page_slice *slice,
+ int ioret)
+{
+ struct ccc_page *cp = cl2ccc_page(slice);
+ struct cl_page *pg = slice->cpl_page;
+ struct page *vmpage = cp->cpg_page;
+ ENTRY;
+
+ LASSERT(ergo(pg->cp_sync_io != NULL, PageLocked(vmpage)));
+ LASSERT(PageWriteback(vmpage));
+
+ CL_PAGE_HEADER(D_PAGE, env, pg, "completing WRITE with %d\n", ioret);
+
+ /*
+ * TODO: Actually it makes sense to add the page into oap pending
+ * list again and so that we don't need to take the page out from
+ * SoM write pending list, if we just meet a recoverable error,
+ * -ENOMEM, etc.
+ * To implement this, we just need to return a non zero value in
+ * ->cpo_completion method. The underlying transfer should be notified
+ * and then re-add the page into pending transfer queue. -jay
+ */
+
+ cp->cpg_write_queued = 0;
+ vvp_write_complete(cl2ccc(slice->cpl_obj), cp);
+
+ /*
+ * Only mark the page error only when it's an async write because
+ * applications won't wait for IO to finish.
+ */
+ if (pg->cp_sync_io == NULL)
+ vvp_vmpage_error(ccc_object_inode(pg->cp_obj), vmpage, ioret);
+
+ end_page_writeback(vmpage);
+ EXIT;
+}
+
+/**
+ * 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);
+ vvp_write_pending(cl2ccc(slice->cpl_obj),
+ cl2ccc_page(slice));
+ 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 ccc_page *vp = cl2ccc_page(slice);
+ struct page *vmpage = vp->cpg_page;
+
+ (*printer)(env, cookie, LUSTRE_VVP_NAME"-page@%p(%d:%d:%d) "
+ "vm@%p ",
+ vp, vp->cpg_defer_uptodate, vp->cpg_ra_used,
+ vp->cpg_write_queued, vmpage);
+ if (vmpage != NULL) {
+ (*printer)(env, cookie, "%lx %d:%d %lx %lu %slru",
+ (long)vmpage->flags, page_count(vmpage),
+ page_mapcount(vmpage), vmpage->private,
+ page_index(vmpage),
+ list_empty(&vmpage->lru) ? "not-" : "");
+ }
+ (*printer)(env, cookie, "\n");
+ 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_vmpage = ccc_page_vmpage,
+ .cpo_discard = vvp_page_discard,
+ .cpo_delete = vvp_page_delete,
+ .cpo_unmap = vvp_page_unmap,
+ .cpo_export = vvp_page_export,
+ .cpo_is_vmlocked = vvp_page_is_vmlocked,
+ .cpo_fini = vvp_page_fini,
+ .cpo_print = vvp_page_print,
+ .cpo_is_under_lock = ccc_page_is_under_lock,
+ .io = {
+ [CRT_READ] = {
+ .cpo_prep = vvp_page_prep_read,
+ .cpo_completion = vvp_page_completion_read,
+ .cpo_make_ready = ccc_fail,
+ },
+ [CRT_WRITE] = {
+ .cpo_prep = vvp_page_prep_write,
+ .cpo_completion = vvp_page_completion_write,
+ .cpo_make_ready = vvp_page_make_ready,
+ }
+ }
+};
+
+static void vvp_transient_page_verify(const struct cl_page *page)
+{
+ struct inode *inode = ccc_object_inode(page->cp_obj);
+
+ LASSERT(!mutex_trylock(&inode->i_mutex));
+}
+
+static int vvp_transient_page_own(const struct lu_env *env,
+ const struct cl_page_slice *slice,
+ struct cl_io *unused, int nonblock)
+{
+ vvp_transient_page_verify(slice->cpl_page);
+ return 0;
+}
+
+static void vvp_transient_page_assume(const struct lu_env *env,
+ const struct cl_page_slice *slice,
+ struct cl_io *unused)
+{
+ vvp_transient_page_verify(slice->cpl_page);
+}
+
+static void vvp_transient_page_unassume(const struct lu_env *env,
+ const struct cl_page_slice *slice,
+ struct cl_io *unused)
+{
+ vvp_transient_page_verify(slice->cpl_page);
+}
+
+static void vvp_transient_page_disown(const struct lu_env *env,
+ const struct cl_page_slice *slice,
+ struct cl_io *unused)
+{
+ vvp_transient_page_verify(slice->cpl_page);
+}
+
+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;
+
+ vvp_transient_page_verify(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 = ccc_object_inode(slice->cpl_obj);
+ int locked;
+
+ locked = !mutex_trylock(&inode->i_mutex);
+ if (!locked)
+ mutex_unlock(&inode->i_mutex);
+ return locked ? -EBUSY : -ENODATA;
+}
+
+static void
+vvp_transient_page_completion(const struct lu_env *env,
+ const struct cl_page_slice *slice,
+ int ioret)
+{
+ vvp_transient_page_verify(slice->cpl_page);
+}
+
+static void vvp_transient_page_fini(const struct lu_env *env,
+ struct cl_page_slice *slice)
+{
+ struct ccc_page *cp = cl2ccc_page(slice);
+ struct cl_page *clp = slice->cpl_page;
+ struct ccc_object *clobj = cl2ccc(clp->cp_obj);
+
+ vvp_page_fini_common(cp);
+ LASSERT(!mutex_trylock(&clobj->cob_inode->i_mutex));
+ 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;
+ page_cache_get(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(!mutex_trylock(&clobj->cob_inode->i_mutex));
+ cl_page_slice_add(page, &cpg->cpg_cl, obj,
+ &vvp_transient_page_ops);
+ clobj->cob_transient_pages++;
+ }
+ return 0;
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.