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 <linux/cred.h> 14 #include <linux/gfp.h> 15 #include "affs.h" 16 17 struct inode *affs_iget(struct super_block *sb, unsigned long ino) 18 { 19 struct affs_sb_info *sbi = AFFS_SB(sb); 20 struct buffer_head *bh; 21 struct affs_tail *tail; 22 struct inode *inode; 23 u32 block; 24 u32 size; 25 u32 prot; 26 u16 id; 27 28 inode = iget_locked(sb, ino); 29 if (!inode) 30 return ERR_PTR(-ENOMEM); 31 if (!(inode->i_state & I_NEW)) 32 return inode; 33 34 pr_debug("affs_iget(%lu)\n", inode->i_ino); 35 36 block = inode->i_ino; 37 bh = affs_bread(sb, block); 38 if (!bh) { 39 affs_warning(sb, "read_inode", "Cannot read block %d", block); 40 goto bad_inode; 41 } 42 if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) { 43 affs_warning(sb,"read_inode", 44 "Checksum or type (ptype=%d) error on inode %d", 45 AFFS_HEAD(bh)->ptype, block); 46 goto bad_inode; 47 } 48 49 tail = AFFS_TAIL(sb, bh); 50 prot = be32_to_cpu(tail->protect); 51 52 inode->i_size = 0; 53 set_nlink(inode, 1); 54 inode->i_mode = 0; 55 AFFS_I(inode)->i_extcnt = 1; 56 AFFS_I(inode)->i_ext_last = ~1; 57 AFFS_I(inode)->i_protect = prot; 58 atomic_set(&AFFS_I(inode)->i_opencnt, 0); 59 AFFS_I(inode)->i_blkcnt = 0; 60 AFFS_I(inode)->i_lc = NULL; 61 AFFS_I(inode)->i_lc_size = 0; 62 AFFS_I(inode)->i_lc_shift = 0; 63 AFFS_I(inode)->i_lc_mask = 0; 64 AFFS_I(inode)->i_ac = NULL; 65 AFFS_I(inode)->i_ext_bh = NULL; 66 AFFS_I(inode)->mmu_private = 0; 67 AFFS_I(inode)->i_lastalloc = 0; 68 AFFS_I(inode)->i_pa_cnt = 0; 69 70 if (affs_test_opt(sbi->s_flags, SF_SETMODE)) 71 inode->i_mode = sbi->s_mode; 72 else 73 inode->i_mode = affs_prot_to_mode(prot); 74 75 id = be16_to_cpu(tail->uid); 76 if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETUID)) 77 inode->i_uid = sbi->s_uid; 78 else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS)) 79 i_uid_write(inode, 0); 80 else 81 i_uid_write(inode, id); 82 83 id = be16_to_cpu(tail->gid); 84 if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETGID)) 85 inode->i_gid = sbi->s_gid; 86 else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS)) 87 i_gid_write(inode, 0); 88 else 89 i_gid_write(inode, id); 90 91 switch (be32_to_cpu(tail->stype)) { 92 case ST_ROOT: 93 inode->i_uid = sbi->s_uid; 94 inode->i_gid = sbi->s_gid; 95 /* fall through */ 96 case ST_USERDIR: 97 if (be32_to_cpu(tail->stype) == ST_USERDIR || 98 affs_test_opt(sbi->s_flags, SF_SETMODE)) { 99 if (inode->i_mode & S_IRUSR) 100 inode->i_mode |= S_IXUSR; 101 if (inode->i_mode & S_IRGRP) 102 inode->i_mode |= S_IXGRP; 103 if (inode->i_mode & S_IROTH) 104 inode->i_mode |= S_IXOTH; 105 inode->i_mode |= S_IFDIR; 106 } else 107 inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR; 108 /* Maybe it should be controlled by mount parameter? */ 109 //inode->i_mode |= S_ISVTX; 110 inode->i_op = &affs_dir_inode_operations; 111 inode->i_fop = &affs_dir_operations; 112 break; 113 case ST_LINKDIR: 114 #if 0 115 affs_warning(sb, "read_inode", "inode is LINKDIR"); 116 goto bad_inode; 117 #else 118 inode->i_mode |= S_IFDIR; 119 /* ... and leave ->i_op and ->i_fop pointing to empty */ 120 break; 121 #endif 122 case ST_LINKFILE: 123 affs_warning(sb, "read_inode", "inode is LINKFILE"); 124 goto bad_inode; 125 case ST_FILE: 126 size = be32_to_cpu(tail->size); 127 inode->i_mode |= S_IFREG; 128 AFFS_I(inode)->mmu_private = inode->i_size = size; 129 if (inode->i_size) { 130 AFFS_I(inode)->i_blkcnt = (size - 1) / 131 sbi->s_data_blksize + 1; 132 AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) / 133 sbi->s_hashsize + 1; 134 } 135 if (tail->link_chain) 136 set_nlink(inode, 2); 137 inode->i_mapping->a_ops = affs_test_opt(sbi->s_flags, SF_OFS) ? 138 &affs_aops_ofs : &affs_aops; 139 inode->i_op = &affs_file_inode_operations; 140 inode->i_fop = &affs_file_operations; 141 break; 142 case ST_SOFTLINK: 143 inode->i_size = strlen((char *)AFFS_HEAD(bh)->table); 144 inode->i_mode |= S_IFLNK; 145 inode_nohighmem(inode); 146 inode->i_op = &affs_symlink_inode_operations; 147 inode->i_data.a_ops = &affs_symlink_aops; 148 break; 149 } 150 151 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec 152 = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) + 153 be32_to_cpu(tail->change.mins) * 60 + 154 be32_to_cpu(tail->change.ticks) / 50 + 155 ((8 * 365 + 2) * 24 * 60 * 60)) + 156 sys_tz.tz_minuteswest * 60; 157 inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0; 158 affs_brelse(bh); 159 unlock_new_inode(inode); 160 return inode; 161 162 bad_inode: 163 affs_brelse(bh); 164 iget_failed(inode); 165 return ERR_PTR(-EIO); 166 } 167 168 int 169 affs_write_inode(struct inode *inode, struct writeback_control *wbc) 170 { 171 struct super_block *sb = inode->i_sb; 172 struct buffer_head *bh; 173 struct affs_tail *tail; 174 uid_t uid; 175 gid_t gid; 176 177 pr_debug("write_inode(%lu)\n", inode->i_ino); 178 179 if (!inode->i_nlink) 180 // possibly free block 181 return 0; 182 bh = affs_bread(sb, inode->i_ino); 183 if (!bh) { 184 affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino); 185 return -EIO; 186 } 187 tail = AFFS_TAIL(sb, bh); 188 if (tail->stype == cpu_to_be32(ST_ROOT)) { 189 affs_secs_to_datestamp(inode->i_mtime.tv_sec, 190 &AFFS_ROOT_TAIL(sb, bh)->root_change); 191 } else { 192 tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect); 193 tail->size = cpu_to_be32(inode->i_size); 194 affs_secs_to_datestamp(inode->i_mtime.tv_sec, &tail->change); 195 if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) { 196 uid = i_uid_read(inode); 197 gid = i_gid_read(inode); 198 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_MUFS)) { 199 if (uid == 0 || uid == 0xFFFF) 200 uid = uid ^ ~0; 201 if (gid == 0 || gid == 0xFFFF) 202 gid = gid ^ ~0; 203 } 204 if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETUID)) 205 tail->uid = cpu_to_be16(uid); 206 if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETGID)) 207 tail->gid = cpu_to_be16(gid); 208 } 209 } 210 affs_fix_checksum(sb, bh); 211 mark_buffer_dirty_inode(bh, inode); 212 affs_brelse(bh); 213 affs_free_prealloc(inode); 214 return 0; 215 } 216 217 int 218 affs_notify_change(struct dentry *dentry, struct iattr *attr) 219 { 220 struct inode *inode = d_inode(dentry); 221 int error; 222 223 pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid); 224 225 error = setattr_prepare(dentry, attr); 226 if (error) 227 goto out; 228 229 if (((attr->ia_valid & ATTR_UID) && 230 affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETUID)) || 231 ((attr->ia_valid & ATTR_GID) && 232 affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETGID)) || 233 ((attr->ia_valid & ATTR_MODE) && 234 (AFFS_SB(inode->i_sb)->s_flags & 235 (AFFS_MOUNT_SF_SETMODE | AFFS_MOUNT_SF_IMMUTABLE)))) { 236 if (!affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_QUIET)) 237 error = -EPERM; 238 goto out; 239 } 240 241 if ((attr->ia_valid & ATTR_SIZE) && 242 attr->ia_size != i_size_read(inode)) { 243 error = inode_newsize_ok(inode, attr->ia_size); 244 if (error) 245 return error; 246 247 truncate_setsize(inode, attr->ia_size); 248 affs_truncate(inode); 249 } 250 251 setattr_copy(inode, attr); 252 mark_inode_dirty(inode); 253 254 if (attr->ia_valid & ATTR_MODE) 255 affs_mode_to_prot(inode); 256 out: 257 return error; 258 } 259 260 void 261 affs_evict_inode(struct inode *inode) 262 { 263 unsigned long cache_page; 264 pr_debug("evict_inode(ino=%lu, nlink=%u)\n", 265 inode->i_ino, inode->i_nlink); 266 truncate_inode_pages_final(&inode->i_data); 267 268 if (!inode->i_nlink) { 269 inode->i_size = 0; 270 affs_truncate(inode); 271 } 272 273 invalidate_inode_buffers(inode); 274 clear_inode(inode); 275 affs_free_prealloc(inode); 276 cache_page = (unsigned long)AFFS_I(inode)->i_lc; 277 if (cache_page) { 278 pr_debug("freeing ext cache\n"); 279 AFFS_I(inode)->i_lc = NULL; 280 AFFS_I(inode)->i_ac = NULL; 281 free_page(cache_page); 282 } 283 affs_brelse(AFFS_I(inode)->i_ext_bh); 284 AFFS_I(inode)->i_ext_last = ~1; 285 AFFS_I(inode)->i_ext_bh = NULL; 286 287 if (!inode->i_nlink) 288 affs_free_block(inode->i_sb, inode->i_ino); 289 } 290 291 struct inode * 292 affs_new_inode(struct inode *dir) 293 { 294 struct super_block *sb = dir->i_sb; 295 struct inode *inode; 296 u32 block; 297 struct buffer_head *bh; 298 299 if (!(inode = new_inode(sb))) 300 goto err_inode; 301 302 if (!(block = affs_alloc_block(dir, dir->i_ino))) 303 goto err_block; 304 305 bh = affs_getzeroblk(sb, block); 306 if (!bh) 307 goto err_bh; 308 mark_buffer_dirty_inode(bh, inode); 309 affs_brelse(bh); 310 311 inode->i_uid = current_fsuid(); 312 inode->i_gid = current_fsgid(); 313 inode->i_ino = block; 314 set_nlink(inode, 1); 315 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); 316 atomic_set(&AFFS_I(inode)->i_opencnt, 0); 317 AFFS_I(inode)->i_blkcnt = 0; 318 AFFS_I(inode)->i_lc = NULL; 319 AFFS_I(inode)->i_lc_size = 0; 320 AFFS_I(inode)->i_lc_shift = 0; 321 AFFS_I(inode)->i_lc_mask = 0; 322 AFFS_I(inode)->i_ac = NULL; 323 AFFS_I(inode)->i_ext_bh = NULL; 324 AFFS_I(inode)->mmu_private = 0; 325 AFFS_I(inode)->i_protect = 0; 326 AFFS_I(inode)->i_lastalloc = 0; 327 AFFS_I(inode)->i_pa_cnt = 0; 328 AFFS_I(inode)->i_extcnt = 1; 329 AFFS_I(inode)->i_ext_last = ~1; 330 331 insert_inode_hash(inode); 332 333 return inode; 334 335 err_bh: 336 affs_free_block(sb, block); 337 err_block: 338 iput(inode); 339 err_inode: 340 return NULL; 341 } 342 343 /* 344 * Add an entry to a directory. Create the header block 345 * and insert it into the hash table. 346 */ 347 348 int 349 affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type) 350 { 351 struct super_block *sb = dir->i_sb; 352 struct buffer_head *inode_bh = NULL; 353 struct buffer_head *bh; 354 u32 block = 0; 355 int retval; 356 357 pr_debug("%s(dir=%lu, inode=%lu, \"%pd\", type=%d)\n", __func__, 358 dir->i_ino, inode->i_ino, dentry, type); 359 360 retval = -EIO; 361 bh = affs_bread(sb, inode->i_ino); 362 if (!bh) 363 goto done; 364 365 affs_lock_link(inode); 366 switch (type) { 367 case ST_LINKFILE: 368 case ST_LINKDIR: 369 retval = -ENOSPC; 370 block = affs_alloc_block(dir, dir->i_ino); 371 if (!block) 372 goto err; 373 retval = -EIO; 374 inode_bh = bh; 375 bh = affs_getzeroblk(sb, block); 376 if (!bh) 377 goto err; 378 break; 379 default: 380 break; 381 } 382 383 AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT); 384 AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr); 385 affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry); 386 AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type); 387 AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino); 388 389 if (inode_bh) { 390 __be32 chain; 391 chain = AFFS_TAIL(sb, inode_bh)->link_chain; 392 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino); 393 AFFS_TAIL(sb, bh)->link_chain = chain; 394 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block); 395 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain)); 396 mark_buffer_dirty_inode(inode_bh, inode); 397 set_nlink(inode, 2); 398 ihold(inode); 399 } 400 affs_fix_checksum(sb, bh); 401 mark_buffer_dirty_inode(bh, inode); 402 dentry->d_fsdata = (void *)(long)bh->b_blocknr; 403 404 affs_lock_dir(dir); 405 retval = affs_insert_hash(dir, bh); 406 mark_buffer_dirty_inode(bh, inode); 407 affs_unlock_dir(dir); 408 affs_unlock_link(inode); 409 410 d_instantiate(dentry, inode); 411 done: 412 affs_brelse(inode_bh); 413 affs_brelse(bh); 414 return retval; 415 err: 416 if (block) 417 affs_free_block(sb, block); 418 affs_unlock_link(inode); 419 goto done; 420 } 421