*
* 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, 2013, Intel Corporation.
+ * Copyright (c) 2011, 2017, 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 LOV layer.
*
#define DEBUG_SUBSYSTEM S_LOV
#include "lov_cl_internal.h"
+#include <linux/bug.h>
+#include <linux/compiler.h>
/** \addtogroup lov
* @{
*/
-/*****************************************************************************
- *
- * Lov page operations.
- *
- */
-
/**
- * 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.
+ * Lov page operations.
*/
-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)
+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(slice->cpl_obj);
- struct lov_layout_raid0 *r0 = lov_r0(loo);
- pgoff_t index = *max_index;
- unsigned int pps; /* pages per stripe */
- ENTRY;
+ 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_layout_raid0 *r0;
+ loff_t offset;
+ loff_t suboff;
+ bool stripe_cached = false;
+ int entry;
+ int stripe;
+ int rc;
- CDEBUG(D_READA, DFID "*max_index = %lu, nr = %d\n",
- PFID(lu_object_fid(lov2lu(loo))), index, r0->lo_nr);
+ ENTRY;
- if (index == 0) /* the page is not covered by any lock */
- RETURN(0);
+ /* Direct i/o (CPT_TRANSIENT) is split strictly to stripes, so we can
+ * cache the stripe information. Buffered i/o is differently
+ * organized, and stripe calculation isn't a significant cost for
+ * buffered i/o, so we only cache this for direct i/o.
+ */
+ stripe_cached = lio->lis_cached_entry != LIS_CACHE_ENTRY_NONE &&
+ page->cp_type == CPT_TRANSIENT;
+
+ offset = index << PAGE_SHIFT;
+
+ if (stripe_cached) {
+ entry = lio->lis_cached_entry;
+ /* if there's no layout at this offset, we'll end up here with
+ * a cached layout entry, so we must verify the layout includes
+ * this offset
+ */
+ if (!lov_io_layout_at_confirm(lio, entry, offset))
+ return -ENODATA;
+ stripe = lio->lis_cached_stripe;
+ /* Offset can never go backwards in an i/o, so this is valid */
+ suboff = lio->lis_cached_suboff + offset - lio->lis_cached_off;
+ } else {
+ entry = lov_io_layout_at(lio, offset);
+ if (entry < 0)
+ return -ENODATA;
+
+ stripe = lov_stripe_number(loo->lo_lsm, entry, offset);
+ rc = lov_stripe_offset(loo->lo_lsm, entry, offset, stripe,
+ &suboff);
+ LASSERT(rc == 0);
+ lio->lis_cached_entry = entry;
+ lio->lis_cached_stripe = stripe;
+ lio->lis_cached_off = offset;
+ lio->lis_cached_suboff = suboff;
+ }
- if (r0->lo_nr == 1) /* single stripe file */
+ if (entry < 0 || !lsm_entry_inited(loo->lo_lsm, entry)) {
+ /* non-existing layout component */
+ lov_page_init_empty(env, obj, page, index);
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);
-}
+ CDEBUG(D_PAGE, "offset %llu, entry %d, stripe %d, suboff %llu\n",
+ offset, entry, stripe, suboff);
-static int lov_raid0_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);
-}
+ page->cp_lov_index = lov_comp_index(entry, stripe);
+ LASSERT(page->cp_lov_index != CP_LOV_INDEX_EMPTY);
-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
-};
+ if (!stripe_cached) {
+ sub = lov_sub_get(env, lio, page->cp_lov_index);
+ if (IS_ERR(sub))
+ RETURN(PTR_ERR(sub));
+ } else {
+ sub = lio->lis_cached_sub;
+ }
-int lov_page_init_raid0(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_sub *sub;
- struct lov_page *lpg = cl_object_page_slice(obj, page);
- loff_t offset;
- obd_off suboff;
- int stripe;
- int rc;
- ENTRY;
+ lio->lis_cached_sub = sub;
- offset = cl_offset(obj, index);
- stripe = lov_stripe_number(loo->lo_lsm, offset);
+ r0 = lov_r0(loo, entry);
LASSERT(stripe < r0->lo_nr);
- rc = lov_stripe_offset(loo->lo_lsm, offset, stripe,
- &suboff);
- LASSERT(rc == 0);
-
- lpg->lps_stripe = stripe;
- cl_page_slice_add(page, &lpg->lps_cl, obj, index, &lov_raid0_page_ops);
-
- sub = lov_sub_get(env, lio, stripe);
- 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) {
+ cl_object_for_each(o, subobj) {
+ if (o->co_ops->coo_page_init) {
rc = o->co_ops->coo_page_init(sub->sub_env, o, page,
- cl_index(subobj, suboff));
+ suboff >> PAGE_SHIFT);
if (rc != 0)
break;
}
}
- lov_sub_put(sub);
- RETURN(rc);
-}
-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);
-
- return (*printer)(env, cookie, LUSTRE_LOV_NAME"-page@%p, empty.\n", lp);
+ RETURN(rc);
}
-static const struct cl_page_operations lov_empty_page_ops = {
- .cpo_print = lov_empty_page_print
-};
-
int lov_page_init_empty(const struct lu_env *env, struct cl_object *obj,
- struct cl_page *page, pgoff_t index)
+ struct cl_page *cl_page, pgoff_t index)
{
- struct lov_page *lpg = cl_object_page_slice(obj, page);
void *addr;
+
ENTRY;
+ BUILD_BUG_ON(!__same_type(cl_page->cp_lov_index, CP_LOV_INDEX_EMPTY));
+ cl_page->cp_lov_index = CP_LOV_INDEX_EMPTY;
- 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);
+ addr = kmap(cl_page->cp_vmpage);
+ memset(addr, 0, PAGE_SIZE);
+ kunmap(cl_page->cp_vmpage);
+ SetPageUptodate(cl_page->cp_vmpage);
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);
+}
/** @} lov */
-
git://git.whamcloud.com / fs / lustre-release.git / blobdiff