*
* 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, 2014, Intel Corporation.
+ * Copyright (c) 2011, 2017, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
*
*/
-/**
- * Adjust the stripe index by layout of raid0. @max_index is the maximum
- * page index covered by an underlying DLM lock.
- * This function converts max_index from stripe level to file level, and make
- * sure it's not beyond one stripe.
- */
-static int lov_raid0_page_is_under_lock(const struct lu_env *env,
- const struct cl_page_slice *slice,
- struct cl_io *unused,
- pgoff_t *max_index)
-{
- struct lov_object *loo = cl2lov(slice->cpl_obj);
- struct lov_layout_raid0 *r0 = lov_r0(loo);
- pgoff_t index = *max_index;
- unsigned int pps; /* pages per stripe */
- ENTRY;
-
- CDEBUG(D_READA, DFID "*max_index = %lu, nr = %d\n",
- PFID(lu_object_fid(lov2lu(loo))), index, r0->lo_nr);
-
- if (index == 0) /* the page is not covered by any lock */
- RETURN(0);
-
- if (r0->lo_nr == 1) /* single stripe file */
- RETURN(0);
-
- /* max_index is stripe level, convert it into file level */
- if (index != CL_PAGE_EOF) {
- int stripeno = lov_page_stripe(slice->cpl_page);
- *max_index = lov_stripe_pgoff(loo->lo_lsm, index, stripeno);
- }
-
- /* calculate the end of current stripe */
- pps = loo->lo_lsm->lsm_stripe_size >> PAGE_CACHE_SHIFT;
- index = slice->cpl_index + pps - slice->cpl_index % pps - 1;
-
- CDEBUG(D_READA, DFID "*max_index = %lu, index = %lu, pps = %u, "
- "stripe_size = %u, stripe no = %u, page index = %lu\n",
- PFID(lu_object_fid(lov2lu(loo))), *max_index, index, pps,
- loo->lo_lsm->lsm_stripe_size, lov_page_stripe(slice->cpl_page),
- slice->cpl_index);
-
- /* never exceed the end of the stripe */
- *max_index = min_t(pgoff_t, *max_index, index);
- RETURN(0);
-}
-
-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_is_under_lock = lov_raid0_page_is_under_lock,
- .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)
break;
}
}
- lov_sub_put(sub);
+
RETURN(rc);
}
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 = {
{
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));
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 */
git://git.whamcloud.com / fs / lustre-release.git / blobdiff