1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 31 #include <sys/types.h> 32 #include <sys/param.h> 33 #include <sys/sysmacros.h> 34 35 /* 36 * This should not be a constant, but for ufs it is 12, not 10 like for s5. 37 */ 38 #define DIRECT 12 /* Number of logical blocks before indirection */ 39 40 fsblkcnt_t 41 nblk(fsblkcnt_t size, ulong_t bsize, ulong_t frsize) 42 { 43 fsblkcnt_t tot, count, count1, d_indirect, t_indirect, ind; 44 fsblkcnt_t frags = 0; 45 46 if (size == 0 || bsize == 0) 47 return (1); 48 49 /* 50 * Need to keep track of indirect blocks. 51 */ 52 53 ind = howmany(bsize, sizeof (daddr_t)); 54 d_indirect = ind + DIRECT; /* double indirection */ 55 t_indirect = ind * (ind + 1) + DIRECT; /* triple indirection */ 56 57 tot = howmany(size, bsize); 58 59 if (tot > t_indirect) { 60 count1 = (tot - ind * ind - (DIRECT + 1)) / ind; 61 count = count1 + count1 / ind + ind + 3; 62 } else if (tot > d_indirect) { 63 count = (tot - (DIRECT + 1)) / ind + 2; 64 } else if (tot > DIRECT) { 65 count = 1; 66 } else { 67 count = 0; 68 frags = (frsize > 0) ? 69 roundup(size, frsize) : 70 roundup(size, bsize); 71 } 72 73 /* Accounting for the indirect blocks, the total becomes */ 74 tot += count; 75 76 /* 77 * calculate number of 512 byte blocks, for frag or full block cases. 78 */ 79 if (!frags) 80 tot *= howmany(bsize, DEV_BSIZE); 81 else 82 tot = howmany(frags, DEV_BSIZE); 83 return (tot); 84 } 85