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 = affs_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 affs_secs_to_datestamp(inode->i_mtime.tv_sec, 188 &AFFS_ROOT_TAIL(sb, bh)->root_change); 189 } else { 190 tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect); 191 tail->size = cpu_to_be32(inode->i_size); 192 affs_secs_to_datestamp(inode->i_mtime.tv_sec, &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 dentry *dentry, struct iattr *attr) 217 { 218 struct inode *inode = d_inode(dentry); 219 int error; 220 221 pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid); 222 223 error = setattr_prepare(dentry, attr); 224 if (error) 225 goto out; 226 227 if (((attr->ia_valid & ATTR_UID) && 228 affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETUID)) || 229 ((attr->ia_valid & ATTR_GID) && 230 affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETGID)) || 231 ((attr->ia_valid & ATTR_MODE) && 232 (AFFS_SB(inode->i_sb)->s_flags & 233 (AFFS_MOUNT_SF_SETMODE | AFFS_MOUNT_SF_IMMUTABLE)))) { 234 if (!affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_QUIET)) 235 error = -EPERM; 236 goto out; 237 } 238 239 if ((attr->ia_valid & ATTR_SIZE) && 240 attr->ia_size != i_size_read(inode)) { 241 error = inode_newsize_ok(inode, attr->ia_size); 242 if (error) 243 return error; 244 245 truncate_setsize(inode, attr->ia_size); 246 affs_truncate(inode); 247 } 248 249 setattr_copy(inode, attr); 250 mark_inode_dirty(inode); 251 252 if (attr->ia_valid & ATTR_MODE) 253 affs_mode_to_prot(inode); 254 out: 255 return error; 256 } 257 258 void 259 affs_evict_inode(struct inode *inode) 260 { 261 unsigned long cache_page; 262 pr_debug("evict_inode(ino=%lu, nlink=%u)\n", 263 inode->i_ino, inode->i_nlink); 264 truncate_inode_pages_final(&inode->i_data); 265 266 if (!inode->i_nlink) { 267 inode->i_size = 0; 268 affs_truncate(inode); 269 } 270 271 invalidate_inode_buffers(inode); 272 clear_inode(inode); 273 affs_free_prealloc(inode); 274 cache_page = (unsigned long)AFFS_I(inode)->i_lc; 275 if (cache_page) { 276 pr_debug("freeing ext cache\n"); 277 AFFS_I(inode)->i_lc = NULL; 278 AFFS_I(inode)->i_ac = NULL; 279 free_page(cache_page); 280 } 281 affs_brelse(AFFS_I(inode)->i_ext_bh); 282 AFFS_I(inode)->i_ext_last = ~1; 283 AFFS_I(inode)->i_ext_bh = NULL; 284 285 if (!inode->i_nlink) 286 affs_free_block(inode->i_sb, inode->i_ino); 287 } 288 289 struct inode * 290 affs_new_inode(struct inode *dir) 291 { 292 struct super_block *sb = dir->i_sb; 293 struct inode *inode; 294 u32 block; 295 struct buffer_head *bh; 296 297 if (!(inode = new_inode(sb))) 298 goto err_inode; 299 300 if (!(block = affs_alloc_block(dir, dir->i_ino))) 301 goto err_block; 302 303 bh = affs_getzeroblk(sb, block); 304 if (!bh) 305 goto err_bh; 306 mark_buffer_dirty_inode(bh, inode); 307 affs_brelse(bh); 308 309 inode->i_uid = current_fsuid(); 310 inode->i_gid = current_fsgid(); 311 inode->i_ino = block; 312 set_nlink(inode, 1); 313 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); 314 atomic_set(&AFFS_I(inode)->i_opencnt, 0); 315 AFFS_I(inode)->i_blkcnt = 0; 316 AFFS_I(inode)->i_lc = NULL; 317 AFFS_I(inode)->i_lc_size = 0; 318 AFFS_I(inode)->i_lc_shift = 0; 319 AFFS_I(inode)->i_lc_mask = 0; 320 AFFS_I(inode)->i_ac = NULL; 321 AFFS_I(inode)->i_ext_bh = NULL; 322 AFFS_I(inode)->mmu_private = 0; 323 AFFS_I(inode)->i_protect = 0; 324 AFFS_I(inode)->i_lastalloc = 0; 325 AFFS_I(inode)->i_pa_cnt = 0; 326 AFFS_I(inode)->i_extcnt = 1; 327 AFFS_I(inode)->i_ext_last = ~1; 328 329 insert_inode_hash(inode); 330 331 return inode; 332 333 err_bh: 334 affs_free_block(sb, block); 335 err_block: 336 iput(inode); 337 err_inode: 338 return NULL; 339 } 340 341 /* 342 * Add an entry to a directory. Create the header block 343 * and insert it into the hash table. 344 */ 345 346 int 347 affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type) 348 { 349 struct super_block *sb = dir->i_sb; 350 struct buffer_head *inode_bh = NULL; 351 struct buffer_head *bh; 352 u32 block = 0; 353 int retval; 354 355 pr_debug("%s(dir=%lu, inode=%lu, \"%pd\", type=%d)\n", __func__, 356 dir->i_ino, inode->i_ino, dentry, type); 357 358 retval = -EIO; 359 bh = affs_bread(sb, inode->i_ino); 360 if (!bh) 361 goto done; 362 363 affs_lock_link(inode); 364 switch (type) { 365 case ST_LINKFILE: 366 case ST_LINKDIR: 367 retval = -ENOSPC; 368 block = affs_alloc_block(dir, dir->i_ino); 369 if (!block) 370 goto err; 371 retval = -EIO; 372 inode_bh = bh; 373 bh = affs_getzeroblk(sb, block); 374 if (!bh) 375 goto err; 376 break; 377 default: 378 break; 379 } 380 381 AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT); 382 AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr); 383 affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry); 384 AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type); 385 AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino); 386 387 if (inode_bh) { 388 __be32 chain; 389 chain = AFFS_TAIL(sb, inode_bh)->link_chain; 390 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino); 391 AFFS_TAIL(sb, bh)->link_chain = chain; 392 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block); 393 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain)); 394 mark_buffer_dirty_inode(inode_bh, inode); 395 set_nlink(inode, 2); 396 ihold(inode); 397 } 398 affs_fix_checksum(sb, bh); 399 mark_buffer_dirty_inode(bh, inode); 400 dentry->d_fsdata = (void *)(long)bh->b_blocknr; 401 402 affs_lock_dir(dir); 403 retval = affs_insert_hash(dir, bh); 404 mark_buffer_dirty_inode(bh, inode); 405 affs_unlock_dir(dir); 406 affs_unlock_link(inode); 407 408 d_instantiate(dentry, inode); 409 done: 410 affs_brelse(inode_bh); 411 affs_brelse(bh); 412 return retval; 413 err: 414 if (block) 415 affs_free_block(sb, block); 416 affs_unlock_link(inode); 417 goto done; 418 } 419