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