X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;ds=sidebyside;f=lustre%2Flov%2Flov_offset.c;h=0c9d6683183e2ff91760632a24ca8089017d1cf6;hb=0df4a140e16dbecfbb7de3ed9d3a185e5ff252e0;hp=471788239f770ee368e4510832c4fa03b7bfb1b6;hpb=d226b2cad3b49ba6fbc761834f7e081e8163a9f2;p=fs%2Flustre-release.git diff --git a/lustre/lov/lov_offset.c b/lustre/lov/lov_offset.c index 4717882..0c9d668 100644 --- a/lustre/lov/lov_offset.c +++ b/lustre/lov/lov_offset.c @@ -1,72 +1,97 @@ -/* -*- 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 -#else -#include -#endif #include -#include #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_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); + 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) +{ + 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. @@ -113,63 +138,46 @@ obd_size lov_stripe_size(struct lov_stripe_md *lsm, obd_size ost_size, * 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; - __u64 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 @@ -188,92 +196,108 @@ 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, 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. + */ +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; + + if (!lu_extent_is_overlapped(ext, &entry->lsme_extent)) + return 0; + + 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; }