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/stat.h> 35 #include <sys/vnode.h> 36 37 #include <fs/ext2fs/ext2fs.h> 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 44 #define XTIME_TO_NSEC(x) ((x & EXT3_NSEC_MASK) >> 2) 45 #define NSEC_TO_XTIME(t) (le32toh(t << 2) & EXT3_NSEC_MASK) 46 47 #ifdef EXT2FS_DEBUG 48 void 49 ext2_print_inode(struct inode *in) 50 { 51 int i; 52 struct ext4_extent_header *ehp; 53 struct ext4_extent *ep; 54 55 printf("Inode: %5ju", (uintmax_t)in->i_number); 56 printf( /* "Inode: %5d" */ 57 " Type: %10s Mode: 0x%o Flags: 0x%x Version: %d acl: 0x%lx\n", 58 "n/a", in->i_mode, in->i_flags, in->i_gen, in->i_facl); 59 printf("User: %5u Group: %5u Size: %ju\n", 60 in->i_uid, in->i_gid, (uintmax_t)in->i_size); 61 printf("Links: %3d Blockcount: %ju\n", 62 in->i_nlink, (uintmax_t)in->i_blocks); 63 printf("ctime: 0x%x", in->i_ctime); 64 printf("atime: 0x%x", in->i_atime); 65 printf("mtime: 0x%x", in->i_mtime); 66 if (E2DI_HAS_XTIME(in)) 67 printf("crtime %#x ", in->i_birthtime); 68 if (in->i_flag & IN_E4EXTENTS) { 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 } else { 79 printf("BLOCKS:"); 80 for (i = 0; i < (in->i_blocks <= 24 ? (in->i_blocks + 1) / 2 : 12); i++) 81 printf(" %d", in->i_db[i]); 82 printf("\n"); 83 } 84 } 85 #endif /* EXT2FS_DEBUG */ 86 87 /* 88 * raw ext2 inode to inode 89 */ 90 int 91 ext2_ei2i(struct ext2fs_dinode *ei, struct inode *ip) 92 { 93 struct m_ext2fs *fs; 94 const static struct ext2fs_dinode ei_zero; 95 96 fs = ip->i_e2fs; 97 ip->i_nlink = ei->e2di_nlink; 98 /* 99 * Godmar thinks - if the link count is zero, then the inode is 100 * unused - according to ext2 standards. Ufs marks this fact by 101 * setting i_mode to zero - why ? I can see that this might lead to 102 * problems in an undelete. 103 */ 104 ip->i_mode = ei->e2di_nlink ? ei->e2di_mode : 0; 105 ip->i_size = ei->e2di_size; 106 if (S_ISREG(ip->i_mode)) 107 ip->i_size |= ((u_int64_t)ei->e2di_size_high) << 32; 108 ip->i_atime = ei->e2di_atime; 109 ip->i_mtime = ei->e2di_mtime; 110 ip->i_ctime = ei->e2di_ctime; 111 if (E2DI_HAS_XTIME(ip)) { 112 ip->i_atimensec = XTIME_TO_NSEC(ei->e2di_atime_extra); 113 ip->i_mtimensec = XTIME_TO_NSEC(ei->e2di_mtime_extra); 114 ip->i_ctimensec = XTIME_TO_NSEC(ei->e2di_ctime_extra); 115 ip->i_birthtime = ei->e2di_crtime; 116 ip->i_birthnsec = XTIME_TO_NSEC(ei->e2di_crtime_extra); 117 } 118 ip->i_flags = 0; 119 ip->i_flags |= (ei->e2di_flags & EXT2_APPEND) ? SF_APPEND : 0; 120 ip->i_flags |= (ei->e2di_flags & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0; 121 ip->i_flags |= (ei->e2di_flags & EXT2_NODUMP) ? UF_NODUMP : 0; 122 ip->i_flag |= (ei->e2di_flags & EXT3_INDEX) ? IN_E3INDEX : 0; 123 ip->i_flag |= (ei->e2di_flags & EXT4_EXTENTS) ? IN_E4EXTENTS : 0; 124 ip->i_blocks = ei->e2di_nblock; 125 ip->i_facl = ei->e2di_facl; 126 if (E2DI_HAS_HUGE_FILE(ip)) { 127 ip->i_blocks |= (uint64_t)ei->e2di_nblock_high << 32; 128 ip->i_facl |= (uint64_t)ei->e2di_facl_high << 32; 129 if (ei->e2di_flags & EXT4_HUGE_FILE) 130 ip->i_blocks = fsbtodb(ip->i_e2fs, ip->i_blocks); 131 } 132 ip->i_gen = ei->e2di_gen; 133 ip->i_uid = ei->e2di_uid; 134 ip->i_gid = ei->e2di_gid; 135 ip->i_uid |= (uint32_t)ei->e2di_uid_high << 16; 136 ip->i_gid |= (uint32_t)ei->e2di_gid_high << 16; 137 138 memcpy(ip->i_data, ei->e2di_blocks, sizeof(ei->e2di_blocks)); 139 140 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM) && 141 memcmp(ei, &ei_zero, EXT2_INODE_SIZE(fs))) 142 return (ext2_ei_csum_verify(ip, ei)); 143 144 return (0); 145 } 146 147 /* 148 * inode to raw ext2 inode 149 */ 150 int 151 ext2_i2ei(struct inode *ip, struct ext2fs_dinode *ei) 152 { 153 struct m_ext2fs *fs; 154 155 fs = ip->i_e2fs; 156 ei->e2di_mode = ip->i_mode; 157 ei->e2di_nlink = ip->i_nlink; 158 /* 159 * Godmar thinks: if dtime is nonzero, ext2 says this inode has been 160 * deleted, this would correspond to a zero link count 161 */ 162 ei->e2di_dtime = ei->e2di_nlink ? 0 : ip->i_mtime; 163 ei->e2di_size = ip->i_size; 164 if (S_ISREG(ip->i_mode)) 165 ei->e2di_size_high = ip->i_size >> 32; 166 ei->e2di_atime = ip->i_atime; 167 ei->e2di_mtime = ip->i_mtime; 168 ei->e2di_ctime = ip->i_ctime; 169 if (E2DI_HAS_XTIME(ip)) { 170 ei->e2di_ctime_extra = NSEC_TO_XTIME(ip->i_ctimensec); 171 ei->e2di_mtime_extra = NSEC_TO_XTIME(ip->i_mtimensec); 172 ei->e2di_atime_extra = NSEC_TO_XTIME(ip->i_atimensec); 173 ei->e2di_crtime = ip->i_birthtime; 174 ei->e2di_crtime_extra = NSEC_TO_XTIME(ip->i_birthnsec); 175 } 176 ei->e2di_flags = 0; 177 ei->e2di_flags |= (ip->i_flags & SF_APPEND) ? EXT2_APPEND : 0; 178 ei->e2di_flags |= (ip->i_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE : 0; 179 ei->e2di_flags |= (ip->i_flags & UF_NODUMP) ? EXT2_NODUMP : 0; 180 ei->e2di_flags |= (ip->i_flag & IN_E3INDEX) ? EXT3_INDEX : 0; 181 ei->e2di_flags |= (ip->i_flag & IN_E4EXTENTS) ? EXT4_EXTENTS : 0; 182 if (ip->i_blocks > ~0U && 183 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE)) { 184 ext2_fserr(fs, ip->i_uid, "i_blocks value is out of range"); 185 return (EIO); 186 } 187 if (ip->i_blocks <= 0xffffffffffffULL) { 188 ei->e2di_nblock = ip->i_blocks & 0xffffffff; 189 ei->e2di_nblock_high = ip->i_blocks >> 32 & 0xffff; 190 } else { 191 ei->e2di_flags |= EXT4_HUGE_FILE; 192 ei->e2di_nblock = dbtofsb(fs, ip->i_blocks); 193 ei->e2di_nblock_high = dbtofsb(fs, ip->i_blocks) >> 32 & 0xffff; 194 } 195 ei->e2di_facl = ip->i_facl & 0xffffffff; 196 ei->e2di_facl_high = ip->i_facl >> 32 & 0xffff; 197 ei->e2di_gen = ip->i_gen; 198 ei->e2di_uid = ip->i_uid & 0xffff; 199 ei->e2di_uid_high = ip->i_uid >> 16 & 0xffff; 200 ei->e2di_gid = ip->i_gid & 0xffff; 201 ei->e2di_gid_high = ip->i_gid >> 16 & 0xffff; 202 203 memcpy(ei->e2di_blocks, ip->i_data, sizeof(ei->e2di_blocks)); 204 205 /* Set inode csum */ 206 ext2_ei_csum_set(ip, ei); 207 208 return (0); 209 } 210