-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
+/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* 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.
+ * 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, Whamcloud, Inc.
+ * Copyright (c) 2011, 2017, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Implementation of cl_page for LOV layer.
*
* Author: Nikita Danilov <nikita.danilov@sun.com>
+ * Author: Jinshan Xiong <jinshan.xiong@intel.com>
*/
#define DEBUG_SUBSYSTEM S_LOV
*
*/
-static int lov_page_invariant(const struct cl_page_slice *slice)
+static int lov_comp_page_print(const struct lu_env *env,
+ const struct cl_page_slice *slice,
+ void *cookie, lu_printer_t printer)
{
- const struct cl_page *page = slice->cpl_page;
- const struct cl_page *sub = lov_sub_page(slice);
-
- return ergo(sub != NULL,
- page->cp_child == sub &&
- sub->cp_parent == page &&
- page->cp_state == sub->cp_state);
-}
+ struct lov_page *lp = cl2lov_page(slice);
-static void lov_page_fini(const struct lu_env *env,
- struct cl_page_slice *slice)
-{
- struct lov_page *lp = cl2lov_page(slice);
- struct cl_page *sub = lov_sub_page(slice);
-
- LINVRNT(lov_page_invariant(slice));
- ENTRY;
-
- if (sub != NULL) {
- LASSERT(sub->cp_state == CPS_FREEING);
- lu_ref_del(&sub->cp_reference, "lov", sub->cp_parent);
- sub->cp_parent = NULL;
- slice->cpl_page->cp_child = NULL;
- cl_page_put(env, sub);
- }
- OBD_SLAB_FREE_PTR(lp, lov_page_kmem);
- EXIT;
+ return (*printer)(env, cookie,
+ LUSTRE_LOV_NAME"-page@%p, gen: %u\n",
+ lp, lp->lps_layout_gen);
}
-static int lov_page_own(const struct lu_env *env,
- const struct cl_page_slice *slice, struct cl_io *io,
- int nonblock)
-{
- struct lov_io *lio = lov_env_io(env);
- struct lov_io_sub *sub;
-
- LINVRNT(lov_page_invariant(slice));
- LINVRNT(!cl2lov_page(slice)->lps_invalid);
- ENTRY;
-
- sub = lov_page_subio(env, lio, slice);
- if (!IS_ERR(sub)) {
- lov_sub_page(slice)->cp_owner = sub->sub_io;
- lov_sub_put(sub);
- } else
- LBUG(); /* Arrgh */
- RETURN(0);
-}
+static const struct cl_page_operations lov_comp_page_ops = {
+ .cpo_print = lov_comp_page_print
+};
-static void lov_page_assume(const struct lu_env *env,
- const struct cl_page_slice *slice, struct cl_io *io)
+int lov_page_init_composite(const struct lu_env *env, struct cl_object *obj,
+ struct cl_page *page, pgoff_t index)
{
- lov_page_own(env, slice, io, 0);
+ struct lov_object *loo = cl2lov(obj);
+ 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);
+ struct lov_layout_raid0 *r0;
+ loff_t offset;
+ loff_t suboff;
+ int entry;
+ int stripe;
+ int rc;
+
+ ENTRY;
+
+ offset = cl_offset(obj, index);
+ 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, entry, offset, stripe, &suboff);
+ LASSERT(rc == 0);
+
+ 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, 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) {
+ rc = o->co_ops->coo_page_init(sub->sub_env, o, page,
+ cl_index(subobj, suboff));
+ if (rc != 0)
+ break;
+ }
+ }
+
+ RETURN(rc);
}
-static int lov_page_print(const struct lu_env *env,
- const struct cl_page_slice *slice,
- void *cookie, lu_printer_t printer)
+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\n", lp);
+ return (*printer)(env, cookie, LUSTRE_LOV_NAME"-page@%p, empty.\n", lp);
}
-static const struct cl_page_operations lov_page_ops = {
- .cpo_fini = lov_page_fini,
- .cpo_own = lov_page_own,
- .cpo_assume = lov_page_assume,
- .cpo_print = lov_page_print
+static const struct cl_page_operations lov_empty_page_ops = {
+ .cpo_print = lov_empty_page_print
};
-static void lov_empty_page_fini(const struct lu_env *env,
- struct cl_page_slice *slice)
+int lov_page_init_empty(const struct lu_env *env, struct cl_object *obj,
+ struct cl_page *page, pgoff_t index)
{
- struct lov_page *lp = cl2lov_page(slice);
-
- LASSERT(slice->cpl_page->cp_child == NULL);
- ENTRY;
- OBD_SLAB_FREE_PTR(lp, lov_page_kmem);
- EXIT;
+ 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));
+ kunmap(page->cp_vmpage);
+ cl_page_export(env, page, 1);
+ RETURN(0);
}
-struct cl_page *lov_page_init_raid0(const struct lu_env *env,
- struct cl_object *obj, struct cl_page *page,
- cfs_page_t *vmpage)
+int lov_page_init_foreign(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_page *subpage;
- struct cl_object *subobj;
- struct lov_io_sub *sub;
- struct lov_page *lpg;
- struct cl_page *result;
- loff_t offset;
- obd_off suboff;
- int stripe;
- int rc;
- ENTRY;
-
- offset = cl_offset(obj, page->cp_index);
- stripe = lov_stripe_number(r0->lo_lsm, offset);
- LASSERT(stripe < r0->lo_nr);
- rc = lov_stripe_offset(r0->lo_lsm, offset, stripe,
- &suboff);
- LASSERT(rc == 0);
-
- OBD_SLAB_ALLOC_PTR_GFP(lpg, lov_page_kmem, CFS_ALLOC_IO);
- if (lpg == NULL)
- GOTO(out, result = ERR_PTR(-ENOMEM));
-
- lpg->lps_invalid = 1;
- cl_page_slice_add(page, &lpg->lps_cl, obj, &lov_page_ops);
-
- sub = lov_sub_get(env, lio, stripe);
- if (IS_ERR(sub))
- GOTO(out, result = (struct cl_page *)sub);
-
- subobj = lovsub2cl(r0->lo_sub[stripe]);
- subpage = cl_page_find_sub(sub->sub_env, subobj,
- cl_index(subobj, suboff), vmpage, page);
- lov_sub_put(sub);
- if (IS_ERR(subpage))
- GOTO(out, result = subpage);
-
- if (likely(subpage->cp_parent == page)) {
- lu_ref_add(&subpage->cp_reference, "lov", page);
- lpg->lps_invalid = 0;
- result = NULL;
- } else {
- CL_PAGE_DEBUG(D_ERROR, env, page, "parent page\n");
- CL_PAGE_DEBUG(D_ERROR, env, subpage, "child page\n");
- LASSERT(0);
- }
-
- EXIT;
-out:
- return(result);
+ CDEBUG(D_PAGE, DFID" has no data\n", PFID(lu_object_fid(&obj->co_lu)));
+ RETURN(-ENODATA);
}
-
-static const struct cl_page_operations lov_empty_page_ops = {
- .cpo_fini = lov_empty_page_fini,
- .cpo_print = lov_page_print
-};
-
-struct cl_page *lov_page_init_empty(const struct lu_env *env,
- struct cl_object *obj, struct cl_page *page,
- cfs_page_t *vmpage)
+bool lov_page_is_empty(const struct cl_page *page)
{
- struct lov_page *lpg;
- int result = -ENOMEM;
- ENTRY;
-
- OBD_SLAB_ALLOC_PTR_GFP(lpg, lov_page_kmem, CFS_ALLOC_IO);
- if (lpg != NULL) {
- void *addr;
- cl_page_slice_add(page, &lpg->lps_cl,
- obj, &lov_empty_page_ops);
- addr = cfs_kmap(vmpage);
- memset(addr, 0, cl_page_size(obj));
- cfs_kunmap(vmpage);
- cl_page_export(env, page, 1);
- result = 0;
- }
- RETURN(ERR_PTR(result));
+ const struct cl_page_slice *slice = cl_page_at(page, &lov_device_type);
+
+ LASSERT(slice != NULL);
+ return slice->cpl_ops == &lov_empty_page_ops;
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff