-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
+/*
+ * GPL HEADER START
*
- * Copyright (C) 2002, 2003 Cluster File Systems, Inc.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
- * This file is part of Lustre, http://www.lustre.org.
+ * 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.
*
- * Lustre is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License 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).
*
- * Lustre 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 for more details.
+ * 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
*
- * You should have received a copy of the GNU General Public License
- * along with Lustre; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * 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) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2012, 2014, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
*/
-#ifndef EXPORT_SYMTAB
-# define EXPORT_SYMTAB
-#endif
#define DEBUG_SUBSYSTEM S_LOV
-#ifdef __KERNEL__
-#include <asm/div64.h>
-#else
-#include <liblustre.h>
-#endif
+#include <libcfs/libcfs.h>
-#include <linux/obd_class.h>
-#include <linux/obd_lov.h>
+#include <obd_class.h>
#include "lov_internal.h"
/* compute object size given "stripeno" and the ost size */
-obd_size lov_stripe_size(struct lov_stripe_md *lsm, obd_size ost_size,
- int stripeno)
+u64 lov_stripe_size(struct lov_stripe_md *lsm, u64 ost_size, int stripeno)
{
- unsigned long ssize = lsm->lsm_stripe_size;
- unsigned long swidth = ssize * lsm->lsm_stripe_count;
- unsigned long stripe_size;
- obd_size lov_size;
+ unsigned long ssize = lsm->lsm_stripe_size;
+ unsigned long stripe_size;
+ loff_t swidth;
+ loff_t lov_size;
+ u32 magic = lsm->lsm_magic;
ENTRY;
if (ost_size == 0)
RETURN(0);
- /* do_div(a, b) returns a % b, and a = a / b */
- stripe_size = do_div(ost_size, ssize);
- if (stripe_size)
- lov_size = ost_size * swidth + stripeno * ssize + stripe_size;
- else
- lov_size = (ost_size - 1) * swidth + (stripeno + 1) * ssize;
+ LASSERT(lsm_op_find(magic) != NULL);
+ lsm_op_find(magic)->lsm_stripe_by_index(lsm, &stripeno, NULL, &swidth);
+
+ /* lov_do_div64(a, b) returns a % b, and a = a / b */
+ stripe_size = lov_do_div64(ost_size, ssize);
+ if (stripe_size)
+ lov_size = ost_size * swidth + stripeno * ssize + stripe_size;
+ else
+ lov_size = (ost_size - 1) * swidth + (stripeno + 1) * ssize;
RETURN(lov_size);
}
+/**
+ * Compute file level page index by stripe level page offset
+ */
+pgoff_t lov_stripe_pgoff(struct lov_stripe_md *lsm, pgoff_t stripe_index,
+ int stripe)
+{
+ loff_t offset;
+
+ offset = lov_stripe_size(lsm, stripe_index << PAGE_CACHE_SHIFT,
+ stripe);
+ return offset >> PAGE_CACHE_SHIFT;
+}
+
/* we have an offset in file backed by an lov and want to find out where
* that offset lands in our given stripe of the file. for the easy
* case where the offset is within the stripe, we just have to scale the
* was moved forward to the start of the stripe in question; 0 when it
* falls in the stripe and no shifting was done; > 0 when the offset
* was outside the stripe and was pulled back to its final byte. */
-int lov_stripe_offset(struct lov_stripe_md *lsm, obd_off lov_off,
- int stripeno, obd_off *obd_off)
+int lov_stripe_offset(struct lov_stripe_md *lsm, loff_t lov_off, int stripeno,
+ loff_t *obdoff)
{
- unsigned long ssize = lsm->lsm_stripe_size;
- unsigned long swidth = ssize * lsm->lsm_stripe_count;
- unsigned long stripe_off, this_stripe;
+ unsigned long ssize = lsm->lsm_stripe_size;
+ loff_t stripe_off;
+ loff_t this_stripe;
+ loff_t swidth;
+ u32 magic = lsm->lsm_magic;
int ret = 0;
if (lov_off == OBD_OBJECT_EOF) {
- *obd_off = OBD_OBJECT_EOF;
+ *obdoff = OBD_OBJECT_EOF;
return 0;
}
- /* do_div(a, b) returns a % b, and a = a / b */
- stripe_off = do_div(lov_off, swidth);
+ LASSERT(lsm_op_find(magic) != NULL);
+ lsm_op_find(magic)->lsm_stripe_by_index(lsm, &stripeno, &lov_off,
+ &swidth);
+
+ /* lov_do_div64(a, b) returns a % b, and a = a / b */
+ stripe_off = lov_do_div64(lov_off, swidth);
- this_stripe = stripeno * ssize;
+ this_stripe = (loff_t)stripeno * ssize;
if (stripe_off < this_stripe) {
stripe_off = 0;
ret = -1;
}
}
- *obd_off = lov_off * ssize + stripe_off;
+ *obdoff = lov_off * ssize + stripe_off;
return ret;
}
* | 0 | 1 | 2 | 0 | 1 | 2 |
* ---------------------------------------------------------------------
*/
-obd_off lov_size_to_stripe(struct lov_stripe_md *lsm, obd_off file_size,
- int stripeno)
+loff_t lov_size_to_stripe(struct lov_stripe_md *lsm, u64 file_size,
+ int stripeno)
{
- unsigned long ssize = lsm->lsm_stripe_size;
- unsigned long swidth = ssize * lsm->lsm_stripe_count;
- unsigned long stripe_off, this_stripe;
+ unsigned long ssize = lsm->lsm_stripe_size;
+ loff_t stripe_off;
+ loff_t this_stripe;
+ loff_t swidth;
+ u32 magic = lsm->lsm_magic;
if (file_size == OBD_OBJECT_EOF)
return OBD_OBJECT_EOF;
- /* do_div(a, b) returns a % b, and a = a / b */
- stripe_off = do_div(file_size, swidth);
+ LASSERT(lsm_op_find(magic) != NULL);
+ lsm_op_find(magic)->lsm_stripe_by_index(lsm, &stripeno, &file_size,
+ &swidth);
- this_stripe = stripeno * ssize;
+ /* lov_do_div64(a, b) returns a % b, and a = a / b */
+ stripe_off = lov_do_div64(file_size, swidth);
+
+ this_stripe = (loff_t)stripeno * ssize;
if (stripe_off < this_stripe) {
/* Move to end of previous stripe, or zero */
if (file_size > 0) {
* that is contained within the lov extent. this returns true if the given
* stripe does intersect with the lov extent. */
int lov_stripe_intersects(struct lov_stripe_md *lsm, int stripeno,
- obd_off start, obd_off end,
- obd_off *obd_start, obd_off *obd_end)
+ loff_t start, loff_t end,
+ loff_t *obd_start, loff_t *obd_end)
{
int start_side, end_side;
start_side = lov_stripe_offset(lsm, start, stripeno, obd_start);
end_side = lov_stripe_offset(lsm, end, stripeno, obd_end);
- CDEBUG(D_INODE, "["LPU64"->"LPU64"] -> [(%d) "LPU64"->"LPU64" (%d)]\n",
- start, end, start_side, *obd_start, *obd_end, end_side);
+ CDEBUG(D_INODE, "["LPD64"->"LPD64"] -> [(%d) "LPD64"->"LPD64" (%d)]\n",
+ start, end, start_side, *obd_start, *obd_end, end_side);
/* this stripe doesn't intersect the file extent when neither
* start or the end intersected the stripe and obd_start and
}
/* compute which stripe number "lov_off" will be written into */
-int lov_stripe_number(struct lov_stripe_md *lsm, obd_off lov_off)
+int lov_stripe_number(struct lov_stripe_md *lsm, loff_t lov_off)
{
- unsigned long ssize = lsm->lsm_stripe_size;
- unsigned long swidth = ssize * lsm->lsm_stripe_count;
- unsigned long stripe_off;
+ unsigned long ssize = lsm->lsm_stripe_size;
+ loff_t stripe_off;
+ loff_t swidth;
+ u32 magic = lsm->lsm_magic;
+
+ LASSERT(lsm_op_find(magic) != NULL);
+ lsm_op_find(magic)->lsm_stripe_by_offset(lsm, NULL, &lov_off, &swidth);
+
+ stripe_off = lov_do_div64(lov_off, swidth);
- stripe_off = do_div(lov_off, swidth);
+ /* Puts stripe_off/ssize result into stripe_off */
+ lov_do_div64(stripe_off, ssize);
- return stripe_off / ssize;
+ return stripe_off;
}