1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/affs/inode.c 4 * 5 * (c) 1996 Hans-Joachim Widmaier - Rewritten 6 * 7 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem. 8 * 9 * (C) 1992 Eric Youngdale Modified for ISO9660 filesystem. 10 * 11 * (C) 1991 Linus Torvalds - minix filesystem 12 */ 13 #include <linux/sched.h> 14 #include <linux/cred.h> 15 #include <linux/gfp.h> 16 #include "affs.h" 17 18 struct inode *affs_iget(struct super_block *sb, unsigned long ino) 19 { 20 struct affs_sb_info *sbi = AFFS_SB(sb); 21 struct buffer_head *bh; 22 struct affs_tail *tail; 23 struct inode *inode; 24 u32 block; 25 u32 size; 26 u32 prot; 27 u16 id; 28 29 inode = iget_locked(sb, ino); 30 if (!inode) 31 return ERR_PTR(-ENOMEM); 32 if (!(inode->i_state & I_NEW)) 33 return inode; 34 35 pr_debug("affs_iget(%lu)\n", inode->i_ino); 36 37 block = inode->i_ino; 38 bh = affs_bread(sb, block); 39 if (!bh) { 40 affs_warning(sb, "read_inode", "Cannot read block %d", block); 41 goto bad_inode; 42 } 43 if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) { 44 affs_warning(sb,"read_inode", 45 "Checksum or type (ptype=%d) error on inode %d", 46 AFFS_HEAD(bh)->ptype, block); 47 goto bad_inode; 48 } 49 50 tail = AFFS_TAIL(sb, bh); 51 prot = be32_to_cpu(tail->protect); 52 53 inode->i_size = 0; 54 set_nlink(inode, 1); 55 inode->i_mode = 0; 56 AFFS_I(inode)->i_extcnt = 1; 57 AFFS_I(inode)->i_ext_last = ~1; 58 AFFS_I(inode)->i_protect = prot; 59 atomic_set(&AFFS_I(inode)->i_opencnt, 0); 60 AFFS_I(inode)->i_blkcnt = 0; 61 AFFS_I(inode)->i_lc = NULL; 62 AFFS_I(inode)->i_lc_size = 0; 63 AFFS_I(inode)->i_lc_shift = 0; 64 AFFS_I(inode)->i_lc_mask = 0; 65 AFFS_I(inode)->i_ac = NULL; 66 AFFS_I(inode)->i_ext_bh = NULL; 67 AFFS_I(inode)->mmu_private = 0; 68 AFFS_I(inode)->i_lastalloc = 0; 69 AFFS_I(inode)->i_pa_cnt = 0; 70 71 if (affs_test_opt(sbi->s_flags, SF_SETMODE)) 72 inode->i_mode = sbi->s_mode; 73 else 74 inode->i_mode = affs_prot_to_mode(prot); 75 76 id = be16_to_cpu(tail->uid); 77 if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETUID)) 78 inode->i_uid = sbi->s_uid; 79 else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS)) 80 i_uid_write(inode, 0); 81 else 82 i_uid_write(inode, id); 83 84 id = be16_to_cpu(tail->gid); 85 if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETGID)) 86 inode->i_gid = sbi->s_gid; 87 else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS)) 88 i_gid_write(inode, 0); 89 else 90 i_gid_write(inode, id); 91 92 switch (be32_to_cpu(tail->stype)) { 93 case ST_ROOT: 94 inode->i_uid = sbi->s_uid; 95 inode->i_gid = sbi->s_gid; 96 fallthrough; 97 case ST_USERDIR: 98 if (be32_to_cpu(tail->stype) == ST_USERDIR || 99 affs_test_opt(sbi->s_flags, SF_SETMODE)) { 100 if (inode->i_mode & S_IRUSR) 101 inode->i_mode |= S_IXUSR; 102 if (inode->i_mode & S_IRGRP) 103 inode->i_mode |= S_IXGRP; 104 if (inode->i_mode & S_IROTH) 105 inode->i_mode |= S_IXOTH; 106 inode->i_mode |= S_IFDIR; 107 } else 108 inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR; 109 /* Maybe it should be controlled by mount parameter? */ 110 //inode->i_mode |= S_ISVTX; 111 inode->i_op = &affs_dir_inode_operations; 112 inode->i_fop = &affs_dir_operations; 113 break; 114 case ST_LINKDIR: 115 #if 0 116 affs_warning(sb, "read_inode", "inode is LINKDIR"); 117 goto bad_inode; 118 #else 119 inode->i_mode |= S_IFDIR; 120 /* ... and leave ->i_op and ->i_fop pointing to empty */ 121 break; 122 #endif 123 case ST_LINKFILE: 124 affs_warning(sb, "read_inode", "inode is LINKFILE"); 125 goto bad_inode; 126 case ST_FILE: 127 size = be32_to_cpu(tail->size); 128 inode->i_mode |= S_IFREG; 129 AFFS_I(inode)->mmu_private = inode->i_size = size; 130 if (inode->i_size) { 131 AFFS_I(inode)->i_blkcnt = (size - 1) / 132 sbi->s_data_blksize + 1; 133 AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) / 134 sbi->s_hashsize + 1; 135 } 136 if (tail->link_chain) 137 set_nlink(inode, 2); 138 inode->i_mapping->a_ops = affs_test_opt(sbi->s_flags, SF_OFS) ? 139 &affs_aops_ofs : &affs_aops; 140 inode->i_op = &affs_file_inode_operations; 141 inode->i_fop = &affs_file_operations; 142 break; 143 case ST_SOFTLINK: 144 inode->i_size = strlen((char *)AFFS_HEAD(bh)->table); 145 inode->i_mode |= S_IFLNK; 146 inode_nohighmem(inode); 147 inode->i_op = &affs_symlink_inode_operations; 148 inode->i_data.a_ops = &affs_symlink_aops; 149 break; 150 } 151 152 inode_set_mtime(inode, 153 inode_set_atime(inode, inode_set_ctime(inode, (be32_to_cpu(tail->change.days) * 86400LL + be32_to_cpu(tail->change.mins) * 60 + be32_to_cpu(tail->change.ticks) / 50 + AFFS_EPOCH_DELTA) + sys_tz.tz_minuteswest * 60, 0).tv_sec, 0).tv_sec, 154 0); 155 affs_brelse(bh); 156 unlock_new_inode(inode); 157 return inode; 158 159 bad_inode: 160 affs_brelse(bh); 161 iget_failed(inode); 162 return ERR_PTR(-EIO); 163 } 164 165 int 166 affs_write_inode(struct inode *inode, struct writeback_control *wbc) 167 { 168 struct super_block *sb = inode->i_sb; 169 struct buffer_head *bh; 170 struct affs_tail *tail; 171 uid_t uid; 172 gid_t gid; 173 174 pr_debug("write_inode(%lu)\n", inode->i_ino); 175 176 if (!inode->i_nlink) 177 // possibly free block 178 return 0; 179 bh = affs_bread(sb, inode->i_ino); 180 if (!bh) { 181 affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino); 182 return -EIO; 183 } 184 tail = AFFS_TAIL(sb, bh); 185 if (tail->stype == cpu_to_be32(ST_ROOT)) { 186 affs_secs_to_datestamp(inode_get_mtime_sec(inode), 187 &AFFS_ROOT_TAIL(sb, bh)->root_change); 188 } else { 189 tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect); 190 tail->size = cpu_to_be32(inode->i_size); 191 affs_secs_to_datestamp(inode_get_mtime_sec(inode), 192 &tail->change); 193 if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) { 194 uid = i_uid_read(inode); 195 gid = i_gid_read(inode); 196 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_MUFS)) { 197 if (uid == 0 || uid == 0xFFFF) 198 uid = uid ^ ~0; 199 if (gid == 0 || gid == 0xFFFF) 200 gid = gid ^ ~0; 201 } 202 if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETUID)) 203 tail->uid = cpu_to_be16(uid); 204 if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETGID)) 205 tail->gid = cpu_to_be16(gid); 206 } 207 } 208 affs_fix_checksum(sb, bh); 209 mark_buffer_dirty_inode(bh, inode); 210 affs_brelse(bh); 211 affs_free_prealloc(inode); 212 return 0; 213 } 214 215 int 216 affs_notify_change(struct mnt_idmap *idmap, struct dentry *dentry, 217 struct iattr *attr) 218 { 219 struct inode *inode = d_inode(dentry); 220 int error; 221 222 pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid); 223 224 error = setattr_prepare(&nop_mnt_idmap, dentry, attr); 225 if (error) 226 goto out; 227 228 if (((attr->ia_valid & ATTR_UID) && 229 affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETUID)) || 230 ((attr->ia_valid & ATTR_GID) && 231 affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETGID)) || 232 ((attr->ia_valid & ATTR_MODE) && 233 (AFFS_SB(inode->i_sb)->s_flags & 234 (AFFS_MOUNT_SF_SETMODE | AFFS_MOUNT_SF_IMMUTABLE)))) { 235 if (!affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_QUIET)) 236 error = -EPERM; 237 goto out; 238 } 239 240 if ((attr->ia_valid & ATTR_SIZE) && 241 attr->ia_size != i_size_read(inode)) { 242 error = inode_newsize_ok(inode, attr->ia_size); 243 if (error) 244 return error; 245 246 truncate_setsize(inode, attr->ia_size); 247 affs_truncate(inode); 248 } 249 250 setattr_copy(&nop_mnt_idmap, inode, attr); 251 mark_inode_dirty(inode); 252 253 if (attr->ia_valid & ATTR_MODE) 254 affs_mode_to_prot(inode); 255 out: 256 return error; 257 } 258 259 void 260 affs_evict_inode(struct inode *inode) 261 { 262 unsigned long cache_page; 263 pr_debug("evict_inode(ino=%lu, nlink=%u)\n", 264 inode->i_ino, inode->i_nlink); 265 truncate_inode_pages_final(&inode->i_data); 266 267 if (!inode->i_nlink) { 268 inode->i_size = 0; 269 affs_truncate(inode); 270 } 271 272 invalidate_inode_buffers(inode); 273 clear_inode(inode); 274 affs_free_prealloc(inode); 275 cache_page = (unsigned long)AFFS_I(inode)->i_lc; 276 if (cache_page) { 277 pr_debug("freeing ext cache\n"); 278 AFFS_I(inode)->i_lc = NULL; 279 AFFS_I(inode)->i_ac = NULL; 280 free_page(cache_page); 281 } 282 affs_brelse(AFFS_I(inode)->i_ext_bh); 283 AFFS_I(inode)->i_ext_last = ~1; 284 AFFS_I(inode)->i_ext_bh = NULL; 285 286 if (!inode->i_nlink) 287 affs_free_block(inode->i_sb, inode->i_ino); 288 } 289 290 struct inode * 291 affs_new_inode(struct inode *dir) 292 { 293 struct super_block *sb = dir->i_sb; 294 struct inode *inode; 295 u32 block; 296 struct buffer_head *bh; 297 298 if (!(inode = new_inode(sb))) 299 goto err_inode; 300 301 if (!(block = affs_alloc_block(dir, dir->i_ino))) 302 goto err_block; 303 304 bh = affs_getzeroblk(sb, block); 305 if (!bh) 306 goto err_bh; 307 mark_buffer_dirty_inode(bh, inode); 308 affs_brelse(bh); 309 310 inode->i_uid = current_fsuid(); 311 inode->i_gid = current_fsgid(); 312 inode->i_ino = block; 313 set_nlink(inode, 1); 314 simple_inode_init_ts(inode); 315 atomic_set(&AFFS_I(inode)->i_opencnt, 0); 316 AFFS_I(inode)->i_blkcnt = 0; 317 AFFS_I(inode)->i_lc = NULL; 318 AFFS_I(inode)->i_lc_size = 0; 319 AFFS_I(inode)->i_lc_shift = 0; 320 AFFS_I(inode)->i_lc_mask = 0; 321 AFFS_I(inode)->i_ac = NULL; 322 AFFS_I(inode)->i_ext_bh = NULL; 323 AFFS_I(inode)->mmu_private = 0; 324 AFFS_I(inode)->i_protect = 0; 325 AFFS_I(inode)->i_lastalloc = 0; 326 AFFS_I(inode)->i_pa_cnt = 0; 327 AFFS_I(inode)->i_extcnt = 1; 328 AFFS_I(inode)->i_ext_last = ~1; 329 330 insert_inode_hash(inode); 331 332 return inode; 333 334 err_bh: 335 affs_free_block(sb, block); 336 err_block: 337 iput(inode); 338 err_inode: 339 return NULL; 340 } 341 342 /* 343 * Add an entry to a directory. Create the header block 344 * and insert it into the hash table. 345 */ 346 347 int 348 affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type) 349 { 350 struct super_block *sb = dir->i_sb; 351 struct buffer_head *inode_bh = NULL; 352 struct buffer_head *bh; 353 u32 block = 0; 354 int retval; 355 356 pr_debug("%s(dir=%lu, inode=%lu, \"%pd\", type=%d)\n", __func__, 357 dir->i_ino, inode->i_ino, dentry, type); 358 359 retval = -EIO; 360 bh = affs_bread(sb, inode->i_ino); 361 if (!bh) 362 goto done; 363 364 affs_lock_link(inode); 365 switch (type) { 366 case ST_LINKFILE: 367 case ST_LINKDIR: 368 retval = -ENOSPC; 369 block = affs_alloc_block(dir, dir->i_ino); 370 if (!block) 371 goto err; 372 retval = -EIO; 373 inode_bh = bh; 374 bh = affs_getzeroblk(sb, block); 375 if (!bh) 376 goto err; 377 break; 378 default: 379 break; 380 } 381 382 AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT); 383 AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr); 384 affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry); 385 AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type); 386 AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino); 387 388 if (inode_bh) { 389 __be32 chain; 390 chain = AFFS_TAIL(sb, inode_bh)->link_chain; 391 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino); 392 AFFS_TAIL(sb, bh)->link_chain = chain; 393 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block); 394 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain)); 395 mark_buffer_dirty_inode(inode_bh, inode); 396 set_nlink(inode, 2); 397 ihold(inode); 398 } 399 affs_fix_checksum(sb, bh); 400 mark_buffer_dirty_inode(bh, inode); 401 dentry->d_fsdata = (void *)(long)bh->b_blocknr; 402 403 affs_lock_dir(dir); 404 retval = affs_insert_hash(dir, bh); 405 mark_buffer_dirty_inode(bh, inode); 406 affs_unlock_dir(dir); 407 affs_unlock_link(inode); 408 409 d_instantiate(dentry, inode); 410 done: 411 affs_brelse(inode_bh); 412 affs_brelse(bh); 413 return retval; 414 err: 415 if (block) 416 affs_free_block(sb, block); 417 affs_unlock_link(inode); 418 goto done; 419 } 420