X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=lustre%2Flov%2Flov_offset.c;h=6d80dab9d03fefbd3ded98ebe5c8f732ec7ca35b;hb=d40b3f9663c7627f0f08c4e3b5efa6cd206ca0f0;hp=804fb5458c4644cf2430cec9b1803fe73571718f;hpb=6869932b552ac705f411de3362f01bd50c1f6f7d;p=fs%2Flustre-release.git diff --git a/lustre/lov/lov_offset.c b/lustre/lov/lov_offset.c index 804fb54..6d80dab 100644 --- a/lustre/lov/lov_offset.c +++ b/lustre/lov/lov_offset.c @@ -1,6 +1,4 @@ -/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- - * vim:expandtab:shiftwidth=8:tabstop=8: - * +/* * GPL HEADER START * * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. @@ -26,39 +24,32 @@ * GPL HEADER END */ /* - * Copyright 2008 Sun Microsystems, Inc. All rights reserved + * 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 "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, stripe_size; - int sindex = stripeno; - obd_size lov_size; - int magic = lsm->lsm_magic; + 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) @@ -66,18 +57,30 @@ obd_size lov_stripe_size(struct lov_stripe_md *lsm, obd_size ost_size, 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); + + /* 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) + 1, + 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 @@ -126,45 +129,29 @@ 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, stripe_off, this_stripe; - __u64 l_off, s_off; - int magic = lsm->lsm_magic; + 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; } 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; + /* 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; @@ -177,7 +164,7 @@ 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; } @@ -200,12 +187,14 @@ 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, stripe_off, this_stripe; - int magic = lsm->lsm_magic; + 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; @@ -214,10 +203,10 @@ obd_off lov_size_to_stripe(struct lov_stripe_md *lsm, obd_off file_size, 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); + /* lov_do_div64(a, b) returns a % b, and a = a / b */ + stripe_off = lov_do_div64(file_size, swidth); - this_stripe = stripeno * ssize; + this_stripe = (loff_t)stripeno * ssize; if (stripe_off < this_stripe) { /* Move to end of previous stripe, or zero */ if (file_size > 0) { @@ -242,16 +231,16 @@ 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) + 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 @@ -274,18 +263,20 @@ 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, stripe_off; - obd_off offset = lov_off; - int magic = lsm->lsm_magic; + 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); + 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; }