X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lustre%2Flov%2Flov_page.c;h=2b9d54a0a949a0b1f8b85c51b5dedd2806d79335;hp=8521225e9a9dee62a236519b8704c109cbd82a95;hb=8d6d2914cf85be0508805cd5195163e1959652f4;hpb=72057a3af19ee02d9a686bd7e7d074917e381310

diff --git a/lustre/lov/lov_page.c b/lustre/lov/lov_page.c
index 8521225..2b9d54a 100644
--- a/lustre/lov/lov_page.c
+++ b/lustre/lov/lov_page.c
@@ -23,7 +23,7 @@
  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  *
- * Copyright (c) 2011, 2015, Intel Corporation.
+ * Copyright (c) 2011, 2017, Intel Corporation.
  */
 /*
  * This file is part of Lustre, http://www.lustre.org/
@@ -49,53 +49,65 @@
  *
  */
 
-static int lov_raid0_page_print(const struct lu_env *env,
-				const struct cl_page_slice *slice,
-				void *cookie, lu_printer_t printer)
+static int lov_comp_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);
+	return (*printer)(env, cookie,
+			  LUSTRE_LOV_NAME"-page@%p, gen: %u\n",
+			  lp, lp->lps_layout_gen);
 }
 
-static const struct cl_page_operations lov_raid0_page_ops = {
-	.cpo_print = lov_raid0_page_print
+static const struct cl_page_operations lov_comp_page_ops = {
+	.cpo_print = lov_comp_page_print
 };
 
-int lov_page_init_raid0(const struct lu_env *env, struct cl_object *obj,
-			struct cl_page *page, pgoff_t index)
+int lov_page_init_composite(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 *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;
-	loff_t			 suboff;
-	int                stripe;
-	int                rc;
+	struct lov_page *lpg = cl_object_page_slice(obj, page);
+	struct lov_layout_raid0 *r0;
+	loff_t offset;
+	loff_t suboff;
+	int entry;
+	int stripe;
+	int rc;
+
 	ENTRY;
 
 	offset = cl_offset(obj, index);
-	stripe = lov_stripe_number(loo->lo_lsm, offset);
+	entry = lov_io_layout_at(lio, offset);
+	if (entry < 0 || !lsm_entry_inited(loo->lo_lsm, entry)) {
+		/* non-existing layout component */
+		lov_page_init_empty(env, obj, page, index);
+		RETURN(0);
+	}
+
+	r0 = lov_r0(loo, entry);
+	stripe = lov_stripe_number(loo->lo_lsm, entry, offset);
 	LASSERT(stripe < r0->lo_nr);
-	rc = lov_stripe_offset(loo->lo_lsm, offset, stripe,
-			       &suboff);
+	rc = lov_stripe_offset(loo->lo_lsm, entry, offset, stripe, &suboff);
 	LASSERT(rc == 0);
 
-	lpg->lps_stripe = stripe;
-	cl_page_slice_add(page, &lpg->lps_cl, obj, index, &lov_raid0_page_ops);
+	page->cp_lov_index = lov_comp_index(entry, stripe);
+	lpg->lps_layout_gen = loo->lo_lsm->lsm_layout_gen;
+	cl_page_slice_add(page, &lpg->lps_cl, obj, index, &lov_comp_page_ops);
 
-	sub = lov_sub_get(env, lio, stripe);
+	sub = lov_sub_get(env, lio, page->cp_lov_index);
 	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 != NULL) {
+		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)
@@ -110,9 +122,9 @@ 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);
+	struct lov_page *lp = cl2lov_page(slice);
 
-        return (*printer)(env, cookie, LUSTRE_LOV_NAME"-page@%p, empty.\n", lp);
+	return (*printer)(env, cookie, LUSTRE_LOV_NAME"-page@%p, empty.\n", lp);
 }
 
 static const struct cl_page_operations lov_empty_page_ops = {
@@ -124,8 +136,10 @@ int lov_page_init_empty(const struct lu_env *env, struct cl_object *obj,
 {
 	struct lov_page *lpg = cl_object_page_slice(obj, page);
 	void *addr;
+
 	ENTRY;
 
+	page->cp_lov_index = ~0;
 	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));
@@ -134,6 +148,21 @@ int lov_page_init_empty(const struct lu_env *env, struct cl_object *obj,
 	RETURN(0);
 }
 
+int lov_page_init_foreign(const struct lu_env *env, struct cl_object *obj,
+			struct cl_page *page, pgoff_t index)
+{
+	CDEBUG(D_PAGE, DFID" has no data\n", PFID(lu_object_fid(&obj->co_lu)));
+	RETURN(-ENODATA);
+}
+
+bool lov_page_is_empty(const struct cl_page *page)
+{
+	const struct cl_page_slice *slice = cl_page_at(page, &lov_device_type);
+
+	LASSERT(slice != NULL);
+	return slice->cpl_ops == &lov_empty_page_ops;
+}
+
 
 /** @} lov */