ext2_inode_cnv.c revision 296992
1/*- 2 * Copyright (c) 1995 The University of Utah and 3 * the Computer Systems Laboratory at the University of Utah (CSL). 4 * All rights reserved. 5 * 6 * Permission to use, copy, modify and distribute this software is hereby 7 * granted provided that (1) source code retains these copyright, permission, 8 * and disclaimer notices, and (2) redistributions including binaries 9 * reproduce the notices in supporting documentation, and (3) all advertising 10 * materials mentioning features or use of this software display the following 11 * acknowledgement: ``This product includes software developed by the 12 * Computer Systems Laboratory at the University of Utah.'' 13 * 14 * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS 15 * IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF 16 * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 17 * 18 * CSL requests users of this software to return to csl-dist@cs.utah.edu any 19 * improvements that they make and grant CSL redistribution rights. 20 * 21 * Utah $Hdr$ 22 * $FreeBSD: stable/10/sys/fs/ext2fs/ext2_inode_cnv.c 296992 2016-03-17 19:28:15Z pfg $ 23 */ 24 25/* 26 * routines to convert on disk ext2 inodes into inodes and back 27 */ 28#include <sys/param.h> 29#include <sys/systm.h> 30#include <sys/endian.h> 31#include <sys/lock.h> 32#include <sys/stat.h> 33#include <sys/vnode.h> 34 35#include <fs/ext2fs/fs.h> 36#include <fs/ext2fs/inode.h> 37#include <fs/ext2fs/ext2fs.h> 38#include <fs/ext2fs/ext2_dinode.h> 39#include <fs/ext2fs/ext2_extern.h> 40 41#define XTIME_TO_NSEC(x) ((x & EXT3_NSEC_MASK) >> 2) 42#define NSEC_TO_XTIME(t) (le32toh(t << 2) & EXT3_NSEC_MASK) 43 44#ifdef EXT2FS_DEBUG 45void 46ext2_print_inode(struct inode *in) 47{ 48 int i; 49 struct ext4_extent_header *ehp; 50 struct ext4_extent *ep; 51 52 printf( "Inode: %5ju", (uintmax_t)in->i_number); 53 printf( /* "Inode: %5d" */ 54 " Type: %10s Mode: 0x%o Flags: 0x%x Version: %d\n", 55 "n/a", in->i_mode, in->i_flags, in->i_gen); 56 printf("User: %5u Group: %5u Size: %ju\n", 57 in->i_uid, in->i_gid, (uintmax_t)in->i_size); 58 printf("Links: %3d Blockcount: %ju\n", 59 in->i_nlink, (uintmax_t)in->i_blocks); 60 printf( "ctime: 0x%x", in->i_ctime); 61 printf( "atime: 0x%x", in->i_atime); 62 printf( "mtime: 0x%x", in->i_mtime); 63 if (E2DI_HAS_XTIME(in)) 64 printf("crtime %#x ", in->i_birthtime); 65 printf("BLOCKS:"); 66 for (i = 0; i < (in->i_blocks <= 24 ? (in->i_blocks + 1) / 2 : 12); i++) 67 printf(" %d", in->i_db[i]); 68 printf("\n"); 69 printf("Extents:\n"); 70 ehp = (struct ext4_extent_header *)in->i_db; 71 printf("Header (magic 0x%x entries %d max %d depth %d gen %d)\n", 72 ehp->eh_magic, ehp->eh_ecount, ehp->eh_max, ehp->eh_depth, 73 ehp->eh_gen); 74 ep = (struct ext4_extent *)(char *)(ehp + 1); 75 printf("Index (blk %d len %d start_lo %d start_hi %d)\n", ep->e_blk, 76 ep->e_len, ep->e_start_lo, ep->e_start_hi); 77 printf("\n"); 78} 79#endif /* EXT2FS_DEBUG */ 80 81/* 82 * raw ext2 inode to inode 83 */ 84void 85ext2_ei2i(struct ext2fs_dinode *ei, struct inode *ip) 86{ 87 int i; 88 89 ip->i_nlink = ei->e2di_nlink; 90 /* Godmar thinks - if the link count is zero, then the inode is 91 unused - according to ext2 standards. Ufs marks this fact 92 by setting i_mode to zero - why ? 93 I can see that this might lead to problems in an undelete. 94 */ 95 ip->i_mode = ei->e2di_nlink ? ei->e2di_mode : 0; 96 ip->i_size = ei->e2di_size; 97 if (S_ISREG(ip->i_mode)) 98 ip->i_size |= ((u_int64_t)ei->e2di_size_high) << 32; 99 ip->i_atime = ei->e2di_atime; 100 ip->i_mtime = ei->e2di_mtime; 101 ip->i_ctime = ei->e2di_ctime; 102 if (E2DI_HAS_XTIME(ip)) { 103 ip->i_atimensec = XTIME_TO_NSEC(ei->e2di_atime_extra); 104 ip->i_mtimensec = XTIME_TO_NSEC(ei->e2di_mtime_extra); 105 ip->i_ctimensec = XTIME_TO_NSEC(ei->e2di_ctime_extra); 106 ip->i_birthtime = ei->e2di_crtime; 107 ip->i_birthnsec = XTIME_TO_NSEC(ei->e2di_crtime_extra); 108 } 109 ip->i_flags = 0; 110 ip->i_flags |= (ei->e2di_flags & EXT2_APPEND) ? SF_APPEND : 0; 111 ip->i_flags |= (ei->e2di_flags & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0; 112 ip->i_flags |= (ei->e2di_flags & EXT2_NODUMP) ? UF_NODUMP : 0; 113 ip->i_flag |= (ei->e2di_flags & EXT3_INDEX) ? IN_E3INDEX : 0; 114 ip->i_flag |= (ei->e2di_flags & EXT4_EXTENTS) ? IN_E4EXTENTS : 0; 115 ip->i_blocks = ei->e2di_nblock; 116 if (E2DI_HAS_HUGE_FILE(ip)) { 117 ip->i_blocks |= (uint64_t)ei->e2di_nblock_high << 32; 118 if (ei->e2di_flags & EXT4_HUGE_FILE) 119 ip->i_blocks = fsbtodb(ip->i_e2fs, ip->i_blocks); 120 } 121 ip->i_gen = ei->e2di_gen; 122 ip->i_uid = ei->e2di_uid; 123 ip->i_gid = ei->e2di_gid; 124 /* XXX use memcpy */ 125 for(i = 0; i < NDADDR; i++) 126 ip->i_db[i] = ei->e2di_blocks[i]; 127 for(i = 0; i < NIADDR; i++) 128 ip->i_ib[i] = ei->e2di_blocks[EXT2_NDIR_BLOCKS + i]; 129} 130 131/* 132 * inode to raw ext2 inode 133 */ 134void 135ext2_i2ei(struct inode *ip, struct ext2fs_dinode *ei) 136{ 137 int i; 138 139 ei->e2di_mode = ip->i_mode; 140 ei->e2di_nlink = ip->i_nlink; 141 /* 142 Godmar thinks: if dtime is nonzero, ext2 says this inode 143 has been deleted, this would correspond to a zero link count 144 */ 145 ei->e2di_dtime = ei->e2di_nlink ? 0 : ip->i_mtime; 146 ei->e2di_size = ip->i_size; 147 if (S_ISREG(ip->i_mode)) 148 ei->e2di_size_high = ip->i_size >> 32; 149 ei->e2di_atime = ip->i_atime; 150 ei->e2di_mtime = ip->i_mtime; 151 ei->e2di_ctime = ip->i_ctime; 152 if (E2DI_HAS_XTIME(ip)) { 153 ei->e2di_ctime_extra = NSEC_TO_XTIME(ip->i_ctimensec); 154 ei->e2di_mtime_extra = NSEC_TO_XTIME(ip->i_mtimensec); 155 ei->e2di_atime_extra = NSEC_TO_XTIME(ip->i_atimensec); 156 ei->e2di_crtime = ip->i_birthtime; 157 ei->e2di_crtime_extra = NSEC_TO_XTIME(ip->i_birthnsec); 158 } 159 ei->e2di_flags = 0; 160 ei->e2di_flags |= (ip->i_flags & SF_APPEND) ? EXT2_APPEND: 0; 161 ei->e2di_flags |= (ip->i_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE: 0; 162 ei->e2di_flags |= (ip->i_flags & UF_NODUMP) ? EXT2_NODUMP: 0; 163 ei->e2di_flags |= (ip->i_flag & IN_E3INDEX) ? EXT3_INDEX: 0; 164 ei->e2di_flags |= (ip->i_flag & IN_E4EXTENTS) ? EXT4_EXTENTS: 0; 165 ei->e2di_nblock = ip->i_blocks & 0xffffffff; 166 ei->e2di_nblock_high = ip->i_blocks >> 32 & 0xffff; 167 ei->e2di_gen = ip->i_gen; 168 ei->e2di_uid = ip->i_uid; 169 ei->e2di_gid = ip->i_gid; 170 /* XXX use memcpy */ 171 for(i = 0; i < NDADDR; i++) 172 ei->e2di_blocks[i] = ip->i_db[i]; 173 for(i = 0; i < NIADDR; i++) 174 ei->e2di_blocks[EXT2_NDIR_BLOCKS + i] = ip->i_ib[i]; 175} 176