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%jx\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\n", in->i_birthtime); 68 else 69 printf("\n"); 70 if (in->i_flag & IN_E4EXTENTS) { 71 printf("Extents:\n"); 72 ehp = (struct ext4_extent_header *)in->i_db; 73 printf("Header (magic 0x%x entries %d max %d depth %d gen %d)\n", 74 ehp->eh_magic, ehp->eh_ecount, ehp->eh_max, ehp->eh_depth, 75 ehp->eh_gen); 76 ep = (struct ext4_extent *)(char *)(ehp + 1); 77 printf("Index (blk %d len %d start_lo %d start_hi %d)\n", ep->e_blk, 78 ep->e_len, ep->e_start_lo, ep->e_start_hi); 79 printf("\n"); 80 } else { 81 printf("BLOCKS:"); 82 for (i = 0; i < (in->i_blocks <= 24 ? (in->i_blocks + 1) / 2 : 12); i++) 83 printf(" %d", in->i_db[i]); 84 printf("\n"); 85 } 86 } 87 #endif /* EXT2FS_DEBUG */ 88 89 /* 90 * raw ext2 inode to inode 91 */ 92 int 93 ext2_ei2i(struct ext2fs_dinode *ei, struct inode *ip) 94 { 95 96 ip->i_nlink = ei->e2di_nlink; 97 /* 98 * Godmar thinks - if the link count is zero, then the inode is 99 * unused - according to ext2 standards. Ufs marks this fact by 100 * setting i_mode to zero - why ? I can see that this might lead to 101 * problems in an undelete. 102 */ 103 ip->i_mode = ei->e2di_nlink ? ei->e2di_mode : 0; 104 ip->i_size = ei->e2di_size; 105 if (S_ISREG(ip->i_mode)) 106 ip->i_size |= ((u_int64_t)ei->e2di_size_high) << 32; 107 ip->i_atime = ei->e2di_atime; 108 ip->i_mtime = ei->e2di_mtime; 109 ip->i_ctime = ei->e2di_ctime; 110 if (E2DI_HAS_XTIME(ip)) { 111 ip->i_atimensec = XTIME_TO_NSEC(ei->e2di_atime_extra); 112 ip->i_mtimensec = XTIME_TO_NSEC(ei->e2di_mtime_extra); 113 ip->i_ctimensec = XTIME_TO_NSEC(ei->e2di_ctime_extra); 114 ip->i_birthtime = ei->e2di_crtime; 115 ip->i_birthnsec = XTIME_TO_NSEC(ei->e2di_crtime_extra); 116 } 117 ip->i_flags = 0; 118 ip->i_flags |= (ei->e2di_flags & EXT2_APPEND) ? SF_APPEND : 0; 119 ip->i_flags |= (ei->e2di_flags & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0; 120 ip->i_flags |= (ei->e2di_flags & EXT2_NODUMP) ? UF_NODUMP : 0; 121 ip->i_flag |= (ei->e2di_flags & EXT3_INDEX) ? IN_E3INDEX : 0; 122 ip->i_flag |= (ei->e2di_flags & EXT4_EXTENTS) ? IN_E4EXTENTS : 0; 123 ip->i_blocks = ei->e2di_nblock; 124 ip->i_facl = ei->e2di_facl; 125 if (E2DI_HAS_HUGE_FILE(ip)) { 126 ip->i_blocks |= (uint64_t)ei->e2di_nblock_high << 32; 127 ip->i_facl |= (uint64_t)ei->e2di_facl_high << 32; 128 if (ei->e2di_flags & EXT4_HUGE_FILE) 129 ip->i_blocks = fsbtodb(ip->i_e2fs, ip->i_blocks); 130 } 131 ip->i_gen = ei->e2di_gen; 132 ip->i_uid = ei->e2di_uid; 133 ip->i_gid = ei->e2di_gid; 134 ip->i_uid |= (uint32_t)ei->e2di_uid_high << 16; 135 ip->i_gid |= (uint32_t)ei->e2di_gid_high << 16; 136 137 memcpy(ip->i_data, ei->e2di_blocks, sizeof(ei->e2di_blocks)); 138 139 /* Verify inode csum. */ 140 return (ext2_ei_csum_verify(ip, ei)); 141 } 142 143 /* 144 * inode to raw ext2 inode 145 */ 146 int 147 ext2_i2ei(struct inode *ip, struct ext2fs_dinode *ei) 148 { 149 struct m_ext2fs *fs; 150 151 fs = ip->i_e2fs; 152 ei->e2di_mode = ip->i_mode; 153 ei->e2di_nlink = ip->i_nlink; 154 /* 155 * Godmar thinks: if dtime is nonzero, ext2 says this inode has been 156 * deleted, this would correspond to a zero link count 157 */ 158 ei->e2di_dtime = ei->e2di_nlink ? 0 : ip->i_mtime; 159 ei->e2di_size = ip->i_size; 160 if (S_ISREG(ip->i_mode)) 161 ei->e2di_size_high = ip->i_size >> 32; 162 ei->e2di_atime = ip->i_atime; 163 ei->e2di_mtime = ip->i_mtime; 164 ei->e2di_ctime = ip->i_ctime; 165 if (E2DI_HAS_XTIME(ip)) { 166 ei->e2di_ctime_extra = NSEC_TO_XTIME(ip->i_ctimensec); 167 ei->e2di_mtime_extra = NSEC_TO_XTIME(ip->i_mtimensec); 168 ei->e2di_atime_extra = NSEC_TO_XTIME(ip->i_atimensec); 169 ei->e2di_crtime = ip->i_birthtime; 170 ei->e2di_crtime_extra = NSEC_TO_XTIME(ip->i_birthnsec); 171 } 172 ei->e2di_flags = 0; 173 ei->e2di_flags |= (ip->i_flags & SF_APPEND) ? EXT2_APPEND : 0; 174 ei->e2di_flags |= (ip->i_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE : 0; 175 ei->e2di_flags |= (ip->i_flags & UF_NODUMP) ? EXT2_NODUMP : 0; 176 ei->e2di_flags |= (ip->i_flag & IN_E3INDEX) ? EXT3_INDEX : 0; 177 ei->e2di_flags |= (ip->i_flag & IN_E4EXTENTS) ? EXT4_EXTENTS : 0; 178 if (ip->i_blocks > ~0U && 179 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE)) { 180 ext2_fserr(fs, ip->i_uid, "i_blocks value is out of range"); 181 return (EIO); 182 } 183 if (ip->i_blocks <= 0xffffffffffffULL) { 184 ei->e2di_nblock = ip->i_blocks & 0xffffffff; 185 ei->e2di_nblock_high = ip->i_blocks >> 32 & 0xffff; 186 } else { 187 ei->e2di_flags |= EXT4_HUGE_FILE; 188 ei->e2di_nblock = dbtofsb(fs, ip->i_blocks); 189 ei->e2di_nblock_high = dbtofsb(fs, ip->i_blocks) >> 32 & 0xffff; 190 } 191 ei->e2di_facl = ip->i_facl & 0xffffffff; 192 ei->e2di_facl_high = ip->i_facl >> 32 & 0xffff; 193 ei->e2di_gen = ip->i_gen; 194 ei->e2di_uid = ip->i_uid & 0xffff; 195 ei->e2di_uid_high = ip->i_uid >> 16 & 0xffff; 196 ei->e2di_gid = ip->i_gid & 0xffff; 197 ei->e2di_gid_high = ip->i_gid >> 16 & 0xffff; 198 199 memcpy(ei->e2di_blocks, ip->i_data, sizeof(ei->e2di_blocks)); 200 201 /* Set inode csum. */ 202 ext2_ei_csum_set(ip, ei); 203 204 return (0); 205 } 206