1 /* 2 * linux/fs/affs/inode.c 3 * 4 * (c) 1996 Hans-Joachim Widmaier - Rewritten 5 * 6 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem. 7 * 8 * (C) 1992 Eric Youngdale Modified for ISO9660 filesystem. 9 * 10 * (C) 1991 Linus Torvalds - minix filesystem 11 */ 12 #include <linux/sched.h> 13 #include "affs.h" 14 15 extern const struct inode_operations affs_symlink_inode_operations; 16 extern struct timezone sys_tz; 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_head *head; 23 struct affs_tail *tail; 24 struct inode *inode; 25 u32 block; 26 u32 size; 27 u32 prot; 28 u16 id; 29 30 inode = iget_locked(sb, ino); 31 if (!inode) 32 return ERR_PTR(-ENOMEM); 33 if (!(inode->i_state & I_NEW)) 34 return inode; 35 36 pr_debug("AFFS: affs_iget(%lu)\n", inode->i_ino); 37 38 block = inode->i_ino; 39 bh = affs_bread(sb, block); 40 if (!bh) { 41 affs_warning(sb, "read_inode", "Cannot read block %d", block); 42 goto bad_inode; 43 } 44 if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) { 45 affs_warning(sb,"read_inode", 46 "Checksum or type (ptype=%d) error on inode %d", 47 AFFS_HEAD(bh)->ptype, block); 48 goto bad_inode; 49 } 50 51 head = AFFS_HEAD(bh); 52 tail = AFFS_TAIL(sb, bh); 53 prot = be32_to_cpu(tail->protect); 54 55 inode->i_size = 0; 56 inode->i_nlink = 1; 57 inode->i_mode = 0; 58 AFFS_I(inode)->i_extcnt = 1; 59 AFFS_I(inode)->i_ext_last = ~1; 60 AFFS_I(inode)->i_protect = prot; 61 AFFS_I(inode)->i_opencnt = 0; 62 AFFS_I(inode)->i_blkcnt = 0; 63 AFFS_I(inode)->i_lc = NULL; 64 AFFS_I(inode)->i_lc_size = 0; 65 AFFS_I(inode)->i_lc_shift = 0; 66 AFFS_I(inode)->i_lc_mask = 0; 67 AFFS_I(inode)->i_ac = NULL; 68 AFFS_I(inode)->i_ext_bh = NULL; 69 AFFS_I(inode)->mmu_private = 0; 70 AFFS_I(inode)->i_lastalloc = 0; 71 AFFS_I(inode)->i_pa_cnt = 0; 72 73 if (sbi->s_flags & SF_SETMODE) 74 inode->i_mode = sbi->s_mode; 75 else 76 inode->i_mode = prot_to_mode(prot); 77 78 id = be16_to_cpu(tail->uid); 79 if (id == 0 || sbi->s_flags & SF_SETUID) 80 inode->i_uid = sbi->s_uid; 81 else if (id == 0xFFFF && sbi->s_flags & SF_MUFS) 82 inode->i_uid = 0; 83 else 84 inode->i_uid = id; 85 86 id = be16_to_cpu(tail->gid); 87 if (id == 0 || sbi->s_flags & SF_SETGID) 88 inode->i_gid = sbi->s_gid; 89 else if (id == 0xFFFF && sbi->s_flags & SF_MUFS) 90 inode->i_gid = 0; 91 else 92 inode->i_gid = id; 93 94 switch (be32_to_cpu(tail->stype)) { 95 case ST_ROOT: 96 inode->i_uid = sbi->s_uid; 97 inode->i_gid = sbi->s_gid; 98 /* fall through */ 99 case ST_USERDIR: 100 if (be32_to_cpu(tail->stype) == ST_USERDIR || 101 sbi->s_flags & SF_SETMODE) { 102 if (inode->i_mode & S_IRUSR) 103 inode->i_mode |= S_IXUSR; 104 if (inode->i_mode & S_IRGRP) 105 inode->i_mode |= S_IXGRP; 106 if (inode->i_mode & S_IROTH) 107 inode->i_mode |= S_IXOTH; 108 inode->i_mode |= S_IFDIR; 109 } else 110 inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR; 111 if (tail->link_chain) 112 inode->i_nlink = 2; 113 /* Maybe it should be controlled by mount parameter? */ 114 //inode->i_mode |= S_ISVTX; 115 inode->i_op = &affs_dir_inode_operations; 116 inode->i_fop = &affs_dir_operations; 117 break; 118 case ST_LINKDIR: 119 #if 0 120 affs_warning(sb, "read_inode", "inode is LINKDIR"); 121 goto bad_inode; 122 #else 123 inode->i_mode |= S_IFDIR; 124 inode->i_op = NULL; 125 inode->i_fop = NULL; 126 break; 127 #endif 128 case ST_LINKFILE: 129 affs_warning(sb, "read_inode", "inode is LINKFILE"); 130 goto bad_inode; 131 case ST_FILE: 132 size = be32_to_cpu(tail->size); 133 inode->i_mode |= S_IFREG; 134 AFFS_I(inode)->mmu_private = inode->i_size = size; 135 if (inode->i_size) { 136 AFFS_I(inode)->i_blkcnt = (size - 1) / 137 sbi->s_data_blksize + 1; 138 AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) / 139 sbi->s_hashsize + 1; 140 } 141 if (tail->link_chain) 142 inode->i_nlink = 2; 143 inode->i_mapping->a_ops = (sbi->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops; 144 inode->i_op = &affs_file_inode_operations; 145 inode->i_fop = &affs_file_operations; 146 break; 147 case ST_SOFTLINK: 148 inode->i_mode |= S_IFLNK; 149 inode->i_op = &affs_symlink_inode_operations; 150 inode->i_data.a_ops = &affs_symlink_aops; 151 break; 152 } 153 154 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec 155 = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) + 156 be32_to_cpu(tail->change.mins) * 60 + 157 be32_to_cpu(tail->change.ticks) / 50 + 158 ((8 * 365 + 2) * 24 * 60 * 60)) + 159 sys_tz.tz_minuteswest * 60; 160 inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0; 161 affs_brelse(bh); 162 unlock_new_inode(inode); 163 return inode; 164 165 bad_inode: 166 affs_brelse(bh); 167 iget_failed(inode); 168 return ERR_PTR(-EIO); 169 } 170 171 int 172 affs_write_inode(struct inode *inode, int unused) 173 { 174 struct super_block *sb = inode->i_sb; 175 struct buffer_head *bh; 176 struct affs_tail *tail; 177 uid_t uid; 178 gid_t gid; 179 180 pr_debug("AFFS: write_inode(%lu)\n",inode->i_ino); 181 182 if (!inode->i_nlink) 183 // possibly free block 184 return 0; 185 bh = affs_bread(sb, inode->i_ino); 186 if (!bh) { 187 affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino); 188 return -EIO; 189 } 190 tail = AFFS_TAIL(sb, bh); 191 if (tail->stype == cpu_to_be32(ST_ROOT)) { 192 secs_to_datestamp(inode->i_mtime.tv_sec,&AFFS_ROOT_TAIL(sb, bh)->root_change); 193 } else { 194 tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect); 195 tail->size = cpu_to_be32(inode->i_size); 196 secs_to_datestamp(inode->i_mtime.tv_sec,&tail->change); 197 if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) { 198 uid = inode->i_uid; 199 gid = inode->i_gid; 200 if (AFFS_SB(sb)->s_flags & SF_MUFS) { 201 if (inode->i_uid == 0 || inode->i_uid == 0xFFFF) 202 uid = inode->i_uid ^ ~0; 203 if (inode->i_gid == 0 || inode->i_gid == 0xFFFF) 204 gid = inode->i_gid ^ ~0; 205 } 206 if (!(AFFS_SB(sb)->s_flags & SF_SETUID)) 207 tail->uid = cpu_to_be16(uid); 208 if (!(AFFS_SB(sb)->s_flags & SF_SETGID)) 209 tail->gid = cpu_to_be16(gid); 210 } 211 } 212 affs_fix_checksum(sb, bh); 213 mark_buffer_dirty_inode(bh, inode); 214 affs_brelse(bh); 215 affs_free_prealloc(inode); 216 return 0; 217 } 218 219 int 220 affs_notify_change(struct dentry *dentry, struct iattr *attr) 221 { 222 struct inode *inode = dentry->d_inode; 223 int error; 224 225 pr_debug("AFFS: notify_change(%lu,0x%x)\n",inode->i_ino,attr->ia_valid); 226 227 error = inode_change_ok(inode,attr); 228 if (error) 229 goto out; 230 231 if (((attr->ia_valid & ATTR_UID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETUID)) || 232 ((attr->ia_valid & ATTR_GID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETGID)) || 233 ((attr->ia_valid & ATTR_MODE) && 234 (AFFS_SB(inode->i_sb)->s_flags & (SF_SETMODE | SF_IMMUTABLE)))) { 235 if (!(AFFS_SB(inode->i_sb)->s_flags & SF_QUIET)) 236 error = -EPERM; 237 goto out; 238 } 239 240 error = inode_setattr(inode, attr); 241 if (!error && (attr->ia_valid & ATTR_MODE)) 242 mode_to_prot(inode); 243 out: 244 return error; 245 } 246 247 void 248 affs_put_inode(struct inode *inode) 249 { 250 pr_debug("AFFS: put_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink); 251 affs_free_prealloc(inode); 252 } 253 254 void 255 affs_drop_inode(struct inode *inode) 256 { 257 mutex_lock(&inode->i_mutex); 258 if (inode->i_size != AFFS_I(inode)->mmu_private) 259 affs_truncate(inode); 260 mutex_unlock(&inode->i_mutex); 261 262 generic_drop_inode(inode); 263 } 264 265 void 266 affs_delete_inode(struct inode *inode) 267 { 268 pr_debug("AFFS: delete_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink); 269 truncate_inode_pages(&inode->i_data, 0); 270 inode->i_size = 0; 271 if (S_ISREG(inode->i_mode)) 272 affs_truncate(inode); 273 clear_inode(inode); 274 affs_free_block(inode->i_sb, inode->i_ino); 275 } 276 277 void 278 affs_clear_inode(struct inode *inode) 279 { 280 unsigned long cache_page = (unsigned long) AFFS_I(inode)->i_lc; 281 282 pr_debug("AFFS: clear_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink); 283 if (cache_page) { 284 pr_debug("AFFS: freeing ext cache\n"); 285 AFFS_I(inode)->i_lc = NULL; 286 AFFS_I(inode)->i_ac = NULL; 287 free_page(cache_page); 288 } 289 affs_brelse(AFFS_I(inode)->i_ext_bh); 290 AFFS_I(inode)->i_ext_last = ~1; 291 AFFS_I(inode)->i_ext_bh = NULL; 292 } 293 294 struct inode * 295 affs_new_inode(struct inode *dir) 296 { 297 struct super_block *sb = dir->i_sb; 298 struct inode *inode; 299 u32 block; 300 struct buffer_head *bh; 301 302 if (!(inode = new_inode(sb))) 303 goto err_inode; 304 305 if (!(block = affs_alloc_block(dir, dir->i_ino))) 306 goto err_block; 307 308 bh = affs_getzeroblk(sb, block); 309 if (!bh) 310 goto err_bh; 311 mark_buffer_dirty_inode(bh, inode); 312 affs_brelse(bh); 313 314 inode->i_uid = current->fsuid; 315 inode->i_gid = current->fsgid; 316 inode->i_ino = block; 317 inode->i_nlink = 1; 318 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; 319 AFFS_I(inode)->i_opencnt = 0; 320 AFFS_I(inode)->i_blkcnt = 0; 321 AFFS_I(inode)->i_lc = NULL; 322 AFFS_I(inode)->i_lc_size = 0; 323 AFFS_I(inode)->i_lc_shift = 0; 324 AFFS_I(inode)->i_lc_mask = 0; 325 AFFS_I(inode)->i_ac = NULL; 326 AFFS_I(inode)->i_ext_bh = NULL; 327 AFFS_I(inode)->mmu_private = 0; 328 AFFS_I(inode)->i_protect = 0; 329 AFFS_I(inode)->i_lastalloc = 0; 330 AFFS_I(inode)->i_pa_cnt = 0; 331 AFFS_I(inode)->i_extcnt = 1; 332 AFFS_I(inode)->i_ext_last = ~1; 333 334 insert_inode_hash(inode); 335 336 return inode; 337 338 err_bh: 339 affs_free_block(sb, block); 340 err_block: 341 iput(inode); 342 err_inode: 343 return NULL; 344 } 345 346 /* 347 * Add an entry to a directory. Create the header block 348 * and insert it into the hash table. 349 */ 350 351 int 352 affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type) 353 { 354 struct super_block *sb = dir->i_sb; 355 struct buffer_head *inode_bh = NULL; 356 struct buffer_head *bh = NULL; 357 u32 block = 0; 358 int retval; 359 360 pr_debug("AFFS: add_entry(dir=%u, inode=%u, \"%*s\", type=%d)\n", (u32)dir->i_ino, 361 (u32)inode->i_ino, (int)dentry->d_name.len, dentry->d_name.name, type); 362 363 retval = -EIO; 364 bh = affs_bread(sb, inode->i_ino); 365 if (!bh) 366 goto done; 367 368 affs_lock_link(inode); 369 switch (type) { 370 case ST_LINKFILE: 371 case ST_LINKDIR: 372 inode_bh = bh; 373 retval = -ENOSPC; 374 block = affs_alloc_block(dir, dir->i_ino); 375 if (!block) 376 goto err; 377 retval = -EIO; 378 bh = affs_getzeroblk(sb, block); 379 if (!bh) 380 goto err; 381 break; 382 default: 383 break; 384 } 385 386 AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT); 387 AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr); 388 affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry); 389 AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type); 390 AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino); 391 392 if (inode_bh) { 393 __be32 chain; 394 chain = AFFS_TAIL(sb, inode_bh)->link_chain; 395 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino); 396 AFFS_TAIL(sb, bh)->link_chain = chain; 397 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block); 398 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain)); 399 mark_buffer_dirty_inode(inode_bh, inode); 400 inode->i_nlink = 2; 401 atomic_inc(&inode->i_count); 402 } 403 affs_fix_checksum(sb, bh); 404 mark_buffer_dirty_inode(bh, inode); 405 dentry->d_fsdata = (void *)(long)bh->b_blocknr; 406 407 affs_lock_dir(dir); 408 retval = affs_insert_hash(dir, bh); 409 mark_buffer_dirty_inode(bh, inode); 410 affs_unlock_dir(dir); 411 affs_unlock_link(inode); 412 413 d_instantiate(dentry, inode); 414 done: 415 affs_brelse(inode_bh); 416 affs_brelse(bh); 417 return retval; 418 err: 419 if (block) 420 affs_free_block(sb, block); 421 affs_unlock_link(inode); 422 goto done; 423 } 424