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 /* fall through */ 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->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec 153 = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) + 154 be32_to_cpu(tail->change.mins) * 60 + 155 be32_to_cpu(tail->change.ticks) / 50 + 156 ((8 * 365 + 2) * 24 * 60 * 60)) + 157 sys_tz.tz_minuteswest * 60; 158 inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0; 159 affs_brelse(bh); 160 unlock_new_inode(inode); 161 return inode; 162 163 bad_inode: 164 affs_brelse(bh); 165 iget_failed(inode); 166 return ERR_PTR(-EIO); 167 } 168 169 int 170 affs_write_inode(struct inode *inode, struct writeback_control *wbc) 171 { 172 struct super_block *sb = inode->i_sb; 173 struct buffer_head *bh; 174 struct affs_tail *tail; 175 uid_t uid; 176 gid_t gid; 177 178 pr_debug("write_inode(%lu)\n", inode->i_ino); 179 180 if (!inode->i_nlink) 181 // possibly free block 182 return 0; 183 bh = affs_bread(sb, inode->i_ino); 184 if (!bh) { 185 affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino); 186 return -EIO; 187 } 188 tail = AFFS_TAIL(sb, bh); 189 if (tail->stype == cpu_to_be32(ST_ROOT)) { 190 affs_secs_to_datestamp(inode->i_mtime.tv_sec, 191 &AFFS_ROOT_TAIL(sb, bh)->root_change); 192 } else { 193 tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect); 194 tail->size = cpu_to_be32(inode->i_size); 195 affs_secs_to_datestamp(inode->i_mtime.tv_sec, &tail->change); 196 if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) { 197 uid = i_uid_read(inode); 198 gid = i_gid_read(inode); 199 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_MUFS)) { 200 if (uid == 0 || uid == 0xFFFF) 201 uid = uid ^ ~0; 202 if (gid == 0 || gid == 0xFFFF) 203 gid = gid ^ ~0; 204 } 205 if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETUID)) 206 tail->uid = cpu_to_be16(uid); 207 if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETGID)) 208 tail->gid = cpu_to_be16(gid); 209 } 210 } 211 affs_fix_checksum(sb, bh); 212 mark_buffer_dirty_inode(bh, inode); 213 affs_brelse(bh); 214 affs_free_prealloc(inode); 215 return 0; 216 } 217 218 int 219 affs_notify_change(struct dentry *dentry, struct iattr *attr) 220 { 221 struct inode *inode = d_inode(dentry); 222 int error; 223 224 pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid); 225 226 error = setattr_prepare(dentry, attr); 227 if (error) 228 goto out; 229 230 if (((attr->ia_valid & ATTR_UID) && 231 affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETUID)) || 232 ((attr->ia_valid & ATTR_GID) && 233 affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETGID)) || 234 ((attr->ia_valid & ATTR_MODE) && 235 (AFFS_SB(inode->i_sb)->s_flags & 236 (AFFS_MOUNT_SF_SETMODE | AFFS_MOUNT_SF_IMMUTABLE)))) { 237 if (!affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_QUIET)) 238 error = -EPERM; 239 goto out; 240 } 241 242 if ((attr->ia_valid & ATTR_SIZE) && 243 attr->ia_size != i_size_read(inode)) { 244 error = inode_newsize_ok(inode, attr->ia_size); 245 if (error) 246 return error; 247 248 truncate_setsize(inode, attr->ia_size); 249 affs_truncate(inode); 250 } 251 252 setattr_copy(inode, attr); 253 mark_inode_dirty(inode); 254 255 if (attr->ia_valid & ATTR_MODE) 256 affs_mode_to_prot(inode); 257 out: 258 return error; 259 } 260 261 void 262 affs_evict_inode(struct inode *inode) 263 { 264 unsigned long cache_page; 265 pr_debug("evict_inode(ino=%lu, nlink=%u)\n", 266 inode->i_ino, inode->i_nlink); 267 truncate_inode_pages_final(&inode->i_data); 268 269 if (!inode->i_nlink) { 270 inode->i_size = 0; 271 affs_truncate(inode); 272 } 273 274 invalidate_inode_buffers(inode); 275 clear_inode(inode); 276 affs_free_prealloc(inode); 277 cache_page = (unsigned long)AFFS_I(inode)->i_lc; 278 if (cache_page) { 279 pr_debug("freeing ext cache\n"); 280 AFFS_I(inode)->i_lc = NULL; 281 AFFS_I(inode)->i_ac = NULL; 282 free_page(cache_page); 283 } 284 affs_brelse(AFFS_I(inode)->i_ext_bh); 285 AFFS_I(inode)->i_ext_last = ~1; 286 AFFS_I(inode)->i_ext_bh = NULL; 287 288 if (!inode->i_nlink) 289 affs_free_block(inode->i_sb, inode->i_ino); 290 } 291 292 struct inode * 293 affs_new_inode(struct inode *dir) 294 { 295 struct super_block *sb = dir->i_sb; 296 struct inode *inode; 297 u32 block; 298 struct buffer_head *bh; 299 300 if (!(inode = new_inode(sb))) 301 goto err_inode; 302 303 if (!(block = affs_alloc_block(dir, dir->i_ino))) 304 goto err_block; 305 306 bh = affs_getzeroblk(sb, block); 307 if (!bh) 308 goto err_bh; 309 mark_buffer_dirty_inode(bh, inode); 310 affs_brelse(bh); 311 312 inode->i_uid = current_fsuid(); 313 inode->i_gid = current_fsgid(); 314 inode->i_ino = block; 315 set_nlink(inode, 1); 316 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); 317 atomic_set(&AFFS_I(inode)->i_opencnt, 0); 318 AFFS_I(inode)->i_blkcnt = 0; 319 AFFS_I(inode)->i_lc = NULL; 320 AFFS_I(inode)->i_lc_size = 0; 321 AFFS_I(inode)->i_lc_shift = 0; 322 AFFS_I(inode)->i_lc_mask = 0; 323 AFFS_I(inode)->i_ac = NULL; 324 AFFS_I(inode)->i_ext_bh = NULL; 325 AFFS_I(inode)->mmu_private = 0; 326 AFFS_I(inode)->i_protect = 0; 327 AFFS_I(inode)->i_lastalloc = 0; 328 AFFS_I(inode)->i_pa_cnt = 0; 329 AFFS_I(inode)->i_extcnt = 1; 330 AFFS_I(inode)->i_ext_last = ~1; 331 332 insert_inode_hash(inode); 333 334 return inode; 335 336 err_bh: 337 affs_free_block(sb, block); 338 err_block: 339 iput(inode); 340 err_inode: 341 return NULL; 342 } 343 344 /* 345 * Add an entry to a directory. Create the header block 346 * and insert it into the hash table. 347 */ 348 349 int 350 affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type) 351 { 352 struct super_block *sb = dir->i_sb; 353 struct buffer_head *inode_bh = NULL; 354 struct buffer_head *bh; 355 u32 block = 0; 356 int retval; 357 358 pr_debug("%s(dir=%lu, inode=%lu, \"%pd\", type=%d)\n", __func__, 359 dir->i_ino, inode->i_ino, dentry, type); 360 361 retval = -EIO; 362 bh = affs_bread(sb, inode->i_ino); 363 if (!bh) 364 goto done; 365 366 affs_lock_link(inode); 367 switch (type) { 368 case ST_LINKFILE: 369 case ST_LINKDIR: 370 retval = -ENOSPC; 371 block = affs_alloc_block(dir, dir->i_ino); 372 if (!block) 373 goto err; 374 retval = -EIO; 375 inode_bh = bh; 376 bh = affs_getzeroblk(sb, block); 377 if (!bh) 378 goto err; 379 break; 380 default: 381 break; 382 } 383 384 AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT); 385 AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr); 386 affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry); 387 AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type); 388 AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino); 389 390 if (inode_bh) { 391 __be32 chain; 392 chain = AFFS_TAIL(sb, inode_bh)->link_chain; 393 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino); 394 AFFS_TAIL(sb, bh)->link_chain = chain; 395 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block); 396 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain)); 397 mark_buffer_dirty_inode(inode_bh, inode); 398 set_nlink(inode, 2); 399 ihold(inode); 400 } 401 affs_fix_checksum(sb, bh); 402 mark_buffer_dirty_inode(bh, inode); 403 dentry->d_fsdata = (void *)(long)bh->b_blocknr; 404 405 affs_lock_dir(dir); 406 retval = affs_insert_hash(dir, bh); 407 mark_buffer_dirty_inode(bh, inode); 408 affs_unlock_dir(dir); 409 affs_unlock_link(inode); 410 411 d_instantiate(dentry, inode); 412 done: 413 affs_brelse(inode_bh); 414 affs_brelse(bh); 415 return retval; 416 err: 417 if (block) 418 affs_free_block(sb, block); 419 affs_unlock_link(inode); 420 goto done; 421 } 422