-/* -*- 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 the Lustre file system, http://www.lustre.org
- * Lustre is a trademark of Cluster File Systems, Inc.
+ * 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.
*
- * You may have signed or agreed to another license before downloading
- * this software. If so, you are bound by the terms and conditions
- * of that agreement, and the following does not apply to you. See the
- * LICENSE file included with this distribution for more information.
+ * 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).
*
- * If you did not agree to a different license, then this copy of Lustre
- * is open source 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.
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.gnu.org/licenses/gpl-2.0.html
*
- * In either case, 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
- * license text for more details.
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2012, 2017, 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 <libcfs/libcfs.h>
-#else
-#include <liblustre.h>
-#endif
#include <obd_class.h>
-#include <obd_lov.h>
#include "lov_internal.h"
+static loff_t stripe_width(struct lov_stripe_md *lsm, unsigned int index)
+{
+ struct lov_stripe_md_entry *entry = lsm->lsm_entries[index];
+
+ LASSERT(index < lsm->lsm_entry_count);
+
+ if (lsme_is_dom(entry))
+ return (loff_t)entry->lsme_stripe_size;
+
+ return (loff_t)entry->lsme_stripe_size * entry->lsme_stripe_count;
+}
+
/* 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, int index, u64 ost_size,
+ int stripeno)
+{
+ unsigned long ssize = lsm->lsm_entries[index]->lsme_stripe_size;
+ unsigned long stripe_size;
+ loff_t swidth;
+ loff_t lov_size;
+
+ ENTRY;
+
+ if (ost_size == 0)
+ RETURN(0);
+
+ swidth = stripe_width(lsm, index);
+
+ /* 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, int index,
+ pgoff_t stripe_index, int stripe)
{
- unsigned long ssize = lsm->lsm_stripe_size;
- unsigned long swidth, stripe_size;
- int sindex = stripeno;
- obd_size lov_size;
- int magic = lsm->lsm_magic;
- ENTRY;
-
- if (ost_size == 0)
- RETURN(0);
-
- LASSERT(lsm_op_find(magic) != NULL);
- lsm_op_find(magic)->lsm_stripe_by_index(lsm, &stripeno, NULL, &swidth);
-
- /* 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;
-
- lov_size += lsm_op_find(magic)->lsm_stripe_offset_by_index(lsm, sindex);
- RETURN(lov_size);
+ loff_t offset;
+
+ offset = lov_stripe_size(lsm, index,
+ (stripe_index << PAGE_SHIFT) + 1,
+ stripe);
+ return offset >> PAGE_SHIFT;
}
-/* we have an offset in file backed by an lov and want to find out where
+/*
+ * 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
* offset down to make it relative to the stripe instead of the lov.
* this function returns < 0 when the offset was "before" the stripe and
* 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)
+ * was outside the stripe and was pulled back to its final byte.
+ */
+int lov_stripe_offset(struct lov_stripe_md *lsm, int index, loff_t lov_off,
+ int stripeno, loff_t *obdoff)
{
- unsigned long ssize = lsm->lsm_stripe_size;
- unsigned long swidth, stripe_off, this_stripe;
- uint64_t l_off, s_off;
- int magic = lsm->lsm_magic;
- int ret = 0;
-
- if (lov_off == OBD_OBJECT_EOF) {
- *obd_off = OBD_OBJECT_EOF;
- return 0;
- }
-
- LASSERT(lsm_op_find(magic) != NULL);
- /*It will check whether the lov_off and stripeno
- *are in the same extent.
- *1) lov_off extent < stripeno extent, ret = -1, obd_off = 0
- *2) lov_off extent > stripeno extent, ret = 1,
- * obd_off = lov_off extent offset*/
- l_off = lsm_op_find(magic)->lsm_stripe_offset_by_index(lsm, stripeno);
- s_off = lsm_op_find(magic)->lsm_stripe_offset_by_offset(lsm, lov_off);
- if (s_off < l_off) {
- ret = -1;
- *obd_off = 0;
- return ret;
- } else if (s_off > l_off) {
- ret = 1;
- *obd_off = s_off;
- return ret;
- }
- /*If they are in the same extent, original logic*/
- lsm_op_find(magic)->lsm_stripe_by_index(lsm, &stripeno, &lov_off,
- &swidth);
-
- /* do_div(a, b) returns a % b, and a = a / b */
- stripe_off = do_div(lov_off, swidth);
-
- this_stripe = stripeno * ssize;
- if (stripe_off < this_stripe) {
- stripe_off = 0;
- ret = -1;
- } else {
- stripe_off -= this_stripe;
-
- if (stripe_off >= ssize) {
- stripe_off = ssize;
- ret = 1;
- }
- }
-
- *obd_off = lov_off * ssize + stripe_off;
- return ret;
+ unsigned long ssize = lsm->lsm_entries[index]->lsme_stripe_size;
+ loff_t stripe_off;
+ loff_t this_stripe;
+ loff_t swidth;
+ int ret = 0;
+
+ if (lov_off == OBD_OBJECT_EOF) {
+ *obdoff = OBD_OBJECT_EOF;
+ return 0;
+ }
+
+ swidth = stripe_width(lsm, index);
+
+ /* lov_do_div64(a, b) returns a % b, and a = a / b */
+ stripe_off = lov_do_div64(lov_off, swidth);
+
+ this_stripe = (loff_t)stripeno * ssize;
+ if (stripe_off < this_stripe) {
+ stripe_off = 0;
+ ret = -1;
+ } else {
+ stripe_off -= this_stripe;
+
+ if (stripe_off >= ssize) {
+ stripe_off = ssize;
+ ret = 1;
+ }
+ }
+
+ *obdoff = lov_off * ssize + stripe_off;
+ return ret;
}
-/* Given a whole-file size and a stripe number, give the file size which
+/*
+ * Given a whole-file size and a stripe number, give the file size which
* corresponds to the individual object of that stripe.
*
* This behaves basically in the same was as lov_stripe_offset, except that
* | 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, int index, u64 file_size,
+ int stripeno)
{
- unsigned long ssize = lsm->lsm_stripe_size;
- unsigned long swidth, stripe_off, this_stripe;
- int magic = lsm->lsm_magic;
-
- if (file_size == OBD_OBJECT_EOF)
- return OBD_OBJECT_EOF;
-
- LASSERT(lsm_op_find(magic) != NULL);
- lsm_op_find(magic)->lsm_stripe_by_index(lsm, &stripeno, &file_size,
- &swidth);
-
- /* do_div(a, b) returns a % b, and a = a / b */
- stripe_off = do_div(file_size, swidth);
-
- this_stripe = stripeno * ssize;
- if (stripe_off < this_stripe) {
- /* Move to end of previous stripe, or zero */
- if (file_size > 0) {
- file_size--;
- stripe_off = ssize;
- } else {
- stripe_off = 0;
- }
- } else {
- stripe_off -= this_stripe;
-
- if (stripe_off >= ssize) {
- /* Clamp to end of this stripe */
- stripe_off = ssize;
- }
- }
-
- return (file_size * ssize + stripe_off);
+ unsigned long ssize = lsm->lsm_entries[index]->lsme_stripe_size;
+ loff_t stripe_off;
+ loff_t this_stripe;
+ loff_t swidth;
+
+ if (file_size == OBD_OBJECT_EOF)
+ return OBD_OBJECT_EOF;
+
+ swidth = stripe_width(lsm, index);
+
+ /* 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) {
+ file_size--;
+ stripe_off = ssize;
+ } else {
+ stripe_off = 0;
+ }
+ } else {
+ stripe_off -= this_stripe;
+
+ if (stripe_off >= ssize) {
+ /* Clamp to end of this stripe */
+ stripe_off = ssize;
+ }
+ }
+
+ return (file_size * ssize + stripe_off);
}
-/* given an extent in an lov and a stripe, calculate the extent of the stripe
+/*
+ * given an extent in an lov and a stripe, calculate the extent of the stripe
* 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)
+ * stripe does intersect with the lov extent.
+ *
+ * Closed interval [@obd_start, @obd_end] will be returned if caller needs them.
+ */
+int lov_stripe_intersects(struct lov_stripe_md *lsm, int index, int stripeno,
+ struct lu_extent *ext, u64 *obd_start, u64 *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);
-
- /* this stripe doesn't intersect the file extent when neither
- * start or the end intersected the stripe and obd_start and
- * obd_end got rounded up to the save value. */
- if (start_side != 0 && end_side != 0 && *obd_start == *obd_end)
- return 0;
-
- /* as mentioned in the lov_stripe_offset commentary, end
- * might have been shifted in the wrong direction. This
- * happens when an end offset is before the stripe when viewed
- * through the "mod stripe size" math. we detect it being shifted
- * in the wrong direction and touch it up.
- * interestingly, this can't underflow since end must be > start
- * if we passed through the previous check.
- * (should we assert for that somewhere?) */
- if (end_side != 0)
- (*obd_end)--;
-
- return 1;
+ struct lov_stripe_md_entry *entry = lsm->lsm_entries[index];
+ u64 start, end;
+ int start_side, end_side;
+ u64 loc_start, loc_end;
+
+ if (!lu_extent_is_overlapped(ext, &entry->lsme_extent))
+ return 0;
+
+ if (!obd_start)
+ obd_start = &loc_start;
+ if (!obd_end)
+ obd_end = &loc_end;
+
+ start = max_t(__u64, ext->e_start, entry->lsme_extent.e_start);
+ end = min_t(__u64, ext->e_end, entry->lsme_extent.e_end);
+ if (end != OBD_OBJECT_EOF)
+ end--;
+
+ start_side = lov_stripe_offset(lsm, index, start, stripeno, obd_start);
+ end_side = lov_stripe_offset(lsm, index, end, stripeno, obd_end);
+
+ CDEBUG(D_INODE, "[%lld->%lld] -> [(%d) %lld->%lld (%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
+ * obd_end got rounded up to the save value.
+ */
+ if (start_side != 0 && end_side != 0 && *obd_start == *obd_end)
+ return 0;
+
+ /*
+ * as mentioned in the lov_stripe_offset commentary, end
+ * might have been shifted in the wrong direction. This
+ * happens when an end offset is before the stripe when viewed
+ * through the "mod stripe size" math. we detect it being shifted
+ * in the wrong direction and touch it up.
+ * interestingly, this can't underflow since end must be > start
+ * if we passed through the previous check.
+ * (should we assert for that somewhere?)
+ */
+ if (end_side != 0)
+ (*obd_end)--;
+
+ return 1;
}
/* 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, int index, loff_t lov_off)
{
- unsigned long ssize = lsm->lsm_stripe_size;
- unsigned long swidth, stripe_off;
- obd_off offset = lov_off;
- int magic = lsm->lsm_magic;
+ unsigned long ssize = lsm->lsm_entries[index]->lsme_stripe_size;
+ loff_t stripe_off;
+ loff_t swidth;
+
+ swidth = stripe_width(lsm, index);
- 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 +
- lsm_op_find(magic)->lsm_stripe_index_by_offset(lsm, offset));
+ return stripe_off;
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff