X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lustre%2Flov%2Flov_offset.c;h=3a7f6106796c58fb48ca66213f8c38fc4e606373;hp=66fad2756e27cecb23467c5ab0e8a15a07c53d7b;hb=f913720c7e09f9e829bbd6bea49e0f4cb9b4e6c5;hpb=fbb7ead129258897f5a5d5c9ce28d31fbbe5bca2 diff --git a/lustre/lov/lov_offset.c b/lustre/lov/lov_offset.c index 66fad27..3a7f610 100644 --- a/lustre/lov/lov_offset.c +++ b/lustre/lov/lov_offset.c @@ -1,63 +1,82 @@ -/* -*- 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.gnu.org/licenses/gpl-2.0.html * - * 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. + * GPL HEADER END + */ +/* + * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. + * Use is subject to license terms. + * + * Copyright (c) 2012, 2015, 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 -#else -#include -#endif +#include -#include -#include +#include #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_SHIFT) + 1, + stripe); + return offset >> PAGE_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 @@ -106,23 +125,29 @@ obd_size lov_stripe_size(struct lov_stripe_md *lsm, obd_size ost_size, * 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; @@ -135,7 +160,7 @@ int lov_stripe_offset(struct lov_stripe_md *lsm, obd_off lov_off, } } - *obd_off = lov_off * ssize + stripe_off; + *obdoff = lov_off * ssize + stripe_off; return ret; } @@ -158,20 +183,26 @@ int lov_stripe_offset(struct lov_stripe_md *lsm, obd_off lov_off, * | 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) { @@ -196,16 +227,15 @@ obd_off lov_size_to_stripe(struct lov_stripe_md *lsm, obd_off file_size, * 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) + u64 start, u64 end, 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); + 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 @@ -228,13 +258,20 @@ int lov_stripe_intersects(struct lov_stripe_md *lsm, int stripeno, } /* 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; }