1/*- 2 * SPDX-License-Identifier: MIT-CMU 3 * 4 * Copyright (c) 1995 The University of Utah and 5 * the Computer Systems Laboratory at the University of Utah (CSL). 6 * All rights reserved. 7 * 8 * Permission to use, copy, modify and distribute this software is hereby 9 * granted provided that (1) source code retains these copyright, permission, 10 * and disclaimer notices, and (2) redistributions including binaries 11 * reproduce the notices in supporting documentation, and (3) all advertising 12 * materials mentioning features or use of this software display the following 13 * acknowledgement: ``This product includes software developed by the 14 * Computer Systems Laboratory at the University of Utah.'' 15 * 16 * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS 17 * IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF 18 * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 19 * 20 * CSL requests users of this software to return to csl-dist@cs.utah.edu any 21 * improvements that they make and grant CSL redistribution rights. 22 * 23 * Utah $Hdr$ 24 * $FreeBSD$ 25 */ 26 27/* 28 * routines to convert on disk ext2 inodes into inodes and back 29 */ 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/endian.h> 33#include <sys/lock.h> 34#include <sys/sdt.h> 35#include <sys/stat.h> 36#include <sys/vnode.h> 37 38#include <fs/ext2fs/fs.h> 39#include <fs/ext2fs/inode.h> 40#include <fs/ext2fs/ext2fs.h> 41#include <fs/ext2fs/ext2_dinode.h> 42#include <fs/ext2fs/ext2_extern.h> 43 44SDT_PROVIDER_DECLARE(ext2fs); 45/* 46 * ext2fs trace probe: 47 * arg0: verbosity. Higher numbers give more verbose messages 48 * arg1: Textual message 49 */ 50SDT_PROBE_DEFINE2(ext2fs, , trace, inode_cnv, "int", "char*"); 51 52#define XTIME_TO_NSEC(x) ((x & EXT3_NSEC_MASK) >> 2) 53#define NSEC_TO_XTIME(t) (le32toh(t << 2) & EXT3_NSEC_MASK) 54 55#ifdef EXT2FS_PRINT_EXTENTS 56void 57ext2_print_inode(struct inode *in) 58{ 59 int i; 60 struct ext4_extent_header *ehp; 61 struct ext4_extent *ep; 62 63 printf("Inode: %5ju", (uintmax_t)in->i_number); 64 printf( /* "Inode: %5d" */ 65 " Type: %10s Mode: 0x%o Flags: 0x%x Version: %d acl: 0x%jx\n", 66 "n/a", in->i_mode, in->i_flags, in->i_gen, in->i_facl); 67 printf("User: %5u Group: %5u Size: %ju\n", 68 in->i_uid, in->i_gid, (uintmax_t)in->i_size); 69 printf("Links: %3d Blockcount: %ju\n", 70 in->i_nlink, (uintmax_t)in->i_blocks); 71 printf("ctime: 0x%x ", in->i_ctime); 72 printf("atime: 0x%x ", in->i_atime); 73 printf("mtime: 0x%x ", in->i_mtime); 74 if (E2DI_HAS_XTIME(in)) 75 printf("crtime %#x\n", in->i_birthtime); 76 else 77 printf("\n"); 78 if (in->i_flag & IN_E4EXTENTS) { 79 printf("Extents:\n"); 80 ehp = (struct ext4_extent_header *)in->i_db; 81 printf("Header (magic 0x%x entries %d max %d depth %d gen %d)\n", 82 ehp->eh_magic, ehp->eh_ecount, ehp->eh_max, ehp->eh_depth, 83 ehp->eh_gen); 84 ep = (struct ext4_extent *)(char *)(ehp + 1); 85 printf("Index (blk %d len %d start_lo %d start_hi %d)\n", ep->e_blk, 86 ep->e_len, ep->e_start_lo, ep->e_start_hi); 87 printf("\n"); 88 } else { 89 printf("BLOCKS:"); 90 for (i = 0; i < (in->i_blocks <= 24 ? (in->i_blocks + 1) / 2 : 12); i++) 91 printf(" %d", in->i_db[i]); 92 printf("\n"); 93 } 94} 95#endif /* EXT2FS_PRINT_EXTENTS */ 96 97/* 98 * raw ext2 inode to inode 99 */ 100int 101ext2_ei2i(struct ext2fs_dinode *ei, struct inode *ip) 102{ 103 struct m_ext2fs *fs = ip->i_e2fs; 104 105 if ((ip->i_number < EXT2_FIRST_INO(fs) && ip->i_number != EXT2_ROOTINO) || 106 (ip->i_number < EXT2_ROOTINO) || 107 (ip->i_number > fs->e2fs->e2fs_icount)) { 108 SDT_PROBE2(ext2fs, , trace, inode_cnv, 1, "bad inode number"); 109 return (EINVAL); 110 } 111 112 if (ip->i_number == EXT2_ROOTINO && ei->e2di_nlink == 0) { 113 SDT_PROBE2(ext2fs, , trace, inode_cnv, 1, "root inode unallocated"); 114 return (EINVAL); 115 } 116 ip->i_nlink = ei->e2di_nlink; 117 118 /* Check extra inode size */ 119 if (EXT2_INODE_SIZE(fs) > E2FS_REV0_INODE_SIZE) { 120 if (E2FS_REV0_INODE_SIZE + ei->e2di_extra_isize > 121 EXT2_INODE_SIZE(fs) || (ei->e2di_extra_isize & 3)) { 122 SDT_PROBE2(ext2fs, , trace, inode_cnv, 1, 123 "bad extra inode size"); 124 return (EINVAL); 125 } 126 } 127 128 /* 129 * Godmar thinks - if the link count is zero, then the inode is 130 * unused - according to ext2 standards. Ufs marks this fact by 131 * setting i_mode to zero - why ? I can see that this might lead to 132 * problems in an undelete. 133 */ 134 ip->i_mode = ei->e2di_nlink ? ei->e2di_mode : 0; 135 ip->i_size = ei->e2di_size; 136 if (S_ISREG(ip->i_mode)) 137 ip->i_size |= ((u_int64_t)ei->e2di_size_high) << 32; 138 ip->i_atime = ei->e2di_atime; 139 ip->i_mtime = ei->e2di_mtime; 140 ip->i_ctime = ei->e2di_ctime; 141 if (E2DI_HAS_XTIME(ip)) { 142 ip->i_atimensec = XTIME_TO_NSEC(ei->e2di_atime_extra); 143 ip->i_mtimensec = XTIME_TO_NSEC(ei->e2di_mtime_extra); 144 ip->i_ctimensec = XTIME_TO_NSEC(ei->e2di_ctime_extra); 145 ip->i_birthtime = ei->e2di_crtime; 146 ip->i_birthnsec = XTIME_TO_NSEC(ei->e2di_crtime_extra); 147 } 148 ip->i_flags = 0; 149 ip->i_flags |= (ei->e2di_flags & EXT2_APPEND) ? SF_APPEND : 0; 150 ip->i_flags |= (ei->e2di_flags & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0; 151 ip->i_flags |= (ei->e2di_flags & EXT2_NODUMP) ? UF_NODUMP : 0; 152 ip->i_flag |= (ei->e2di_flags & EXT3_INDEX) ? IN_E3INDEX : 0; 153 ip->i_flag |= (ei->e2di_flags & EXT4_EXTENTS) ? IN_E4EXTENTS : 0; 154 ip->i_blocks = ei->e2di_nblock; 155 ip->i_facl = ei->e2di_facl; 156 if (E2DI_HAS_HUGE_FILE(ip)) { 157 ip->i_blocks |= (uint64_t)ei->e2di_nblock_high << 32; 158 ip->i_facl |= (uint64_t)ei->e2di_facl_high << 32; 159 if (ei->e2di_flags & EXT4_HUGE_FILE) 160 ip->i_blocks = fsbtodb(ip->i_e2fs, ip->i_blocks); 161 } 162 ip->i_gen = ei->e2di_gen; 163 ip->i_uid = ei->e2di_uid; 164 ip->i_gid = ei->e2di_gid; 165 ip->i_uid |= (uint32_t)ei->e2di_uid_high << 16; 166 ip->i_gid |= (uint32_t)ei->e2di_gid_high << 16; 167 168 memcpy(ip->i_data, ei->e2di_blocks, sizeof(ei->e2di_blocks)); 169 170 /* Verify inode csum. */ 171 return (ext2_ei_csum_verify(ip, ei)); 172} 173 174/* 175 * inode to raw ext2 inode 176 */ 177int 178ext2_i2ei(struct inode *ip, struct ext2fs_dinode *ei) 179{ 180 struct m_ext2fs *fs; 181 182 fs = ip->i_e2fs; 183 ei->e2di_mode = ip->i_mode; 184 ei->e2di_nlink = ip->i_nlink; 185 /* 186 * Godmar thinks: if dtime is nonzero, ext2 says this inode has been 187 * deleted, this would correspond to a zero link count 188 */ 189 ei->e2di_dtime = ei->e2di_nlink ? 0 : ip->i_mtime; 190 ei->e2di_size = ip->i_size; 191 if (S_ISREG(ip->i_mode)) 192 ei->e2di_size_high = ip->i_size >> 32; 193 ei->e2di_atime = ip->i_atime; 194 ei->e2di_mtime = ip->i_mtime; 195 ei->e2di_ctime = ip->i_ctime; 196 if (E2DI_HAS_XTIME(ip)) { 197 ei->e2di_ctime_extra = NSEC_TO_XTIME(ip->i_ctimensec); 198 ei->e2di_mtime_extra = NSEC_TO_XTIME(ip->i_mtimensec); 199 ei->e2di_atime_extra = NSEC_TO_XTIME(ip->i_atimensec); 200 ei->e2di_crtime = ip->i_birthtime; 201 ei->e2di_crtime_extra = NSEC_TO_XTIME(ip->i_birthnsec); 202 } 203 ei->e2di_flags = 0; 204 ei->e2di_flags |= (ip->i_flags & SF_APPEND) ? EXT2_APPEND : 0; 205 ei->e2di_flags |= (ip->i_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE : 0; 206 ei->e2di_flags |= (ip->i_flags & UF_NODUMP) ? EXT2_NODUMP : 0; 207 ei->e2di_flags |= (ip->i_flag & IN_E3INDEX) ? EXT3_INDEX : 0; 208 ei->e2di_flags |= (ip->i_flag & IN_E4EXTENTS) ? EXT4_EXTENTS : 0; 209 if (ip->i_blocks > ~0U && 210 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE)) { 211 SDT_PROBE2(ext2fs, , trace, inode_cnv, 1, "i_blocks value is out of range"); 212 return (EIO); 213 } 214 if (ip->i_blocks <= 0xffffffffffffULL) { 215 ei->e2di_nblock = ip->i_blocks & 0xffffffff; 216 ei->e2di_nblock_high = ip->i_blocks >> 32 & 0xffff; 217 } else { 218 ei->e2di_flags |= EXT4_HUGE_FILE; 219 ei->e2di_nblock = dbtofsb(fs, ip->i_blocks); 220 ei->e2di_nblock_high = dbtofsb(fs, ip->i_blocks) >> 32 & 0xffff; 221 } 222 ei->e2di_facl = ip->i_facl & 0xffffffff; 223 ei->e2di_facl_high = ip->i_facl >> 32 & 0xffff; 224 ei->e2di_gen = ip->i_gen; 225 ei->e2di_uid = ip->i_uid & 0xffff; 226 ei->e2di_uid_high = ip->i_uid >> 16 & 0xffff; 227 ei->e2di_gid = ip->i_gid & 0xffff; 228 ei->e2di_gid_high = ip->i_gid >> 16 & 0xffff; 229 230 memcpy(ei->e2di_blocks, ip->i_data, sizeof(ei->e2di_blocks)); 231 232 /* Set inode csum. */ 233 ext2_ei_csum_set(ip, ei); 234 235 return (0); 236} 237