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 atomic_set(&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 /* Maybe it should be controlled by mount parameter? */ 112 //inode->i_mode |= S_ISVTX; 113 inode->i_op = &affs_dir_inode_operations; 114 inode->i_fop = &affs_dir_operations; 115 break; 116 case ST_LINKDIR: 117 #if 0 118 affs_warning(sb, "read_inode", "inode is LINKDIR"); 119 goto bad_inode; 120 #else 121 inode->i_mode |= S_IFDIR; 122 /* ... and leave ->i_op and ->i_fop pointing to empty */ 123 break; 124 #endif 125 case ST_LINKFILE: 126 affs_warning(sb, "read_inode", "inode is LINKFILE"); 127 goto bad_inode; 128 case ST_FILE: 129 size = be32_to_cpu(tail->size); 130 inode->i_mode |= S_IFREG; 131 AFFS_I(inode)->mmu_private = inode->i_size = size; 132 if (inode->i_size) { 133 AFFS_I(inode)->i_blkcnt = (size - 1) / 134 sbi->s_data_blksize + 1; 135 AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) / 136 sbi->s_hashsize + 1; 137 } 138 if (tail->link_chain) 139 inode->i_nlink = 2; 140 inode->i_mapping->a_ops = (sbi->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops; 141 inode->i_op = &affs_file_inode_operations; 142 inode->i_fop = &affs_file_operations; 143 break; 144 case ST_SOFTLINK: 145 inode->i_mode |= S_IFLNK; 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, int unused) 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("AFFS: 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 secs_to_datestamp(inode->i_mtime.tv_sec,&AFFS_ROOT_TAIL(sb, bh)->root_change); 190 } else { 191 tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect); 192 tail->size = cpu_to_be32(inode->i_size); 193 secs_to_datestamp(inode->i_mtime.tv_sec,&tail->change); 194 if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) { 195 uid = inode->i_uid; 196 gid = inode->i_gid; 197 if (AFFS_SB(sb)->s_flags & SF_MUFS) { 198 if (inode->i_uid == 0 || inode->i_uid == 0xFFFF) 199 uid = inode->i_uid ^ ~0; 200 if (inode->i_gid == 0 || inode->i_gid == 0xFFFF) 201 gid = inode->i_gid ^ ~0; 202 } 203 if (!(AFFS_SB(sb)->s_flags & SF_SETUID)) 204 tail->uid = cpu_to_be16(uid); 205 if (!(AFFS_SB(sb)->s_flags & SF_SETGID)) 206 tail->gid = cpu_to_be16(gid); 207 } 208 } 209 affs_fix_checksum(sb, bh); 210 mark_buffer_dirty_inode(bh, inode); 211 affs_brelse(bh); 212 affs_free_prealloc(inode); 213 return 0; 214 } 215 216 int 217 affs_notify_change(struct dentry *dentry, struct iattr *attr) 218 { 219 struct inode *inode = dentry->d_inode; 220 int error; 221 222 pr_debug("AFFS: notify_change(%lu,0x%x)\n",inode->i_ino,attr->ia_valid); 223 224 error = inode_change_ok(inode,attr); 225 if (error) 226 goto out; 227 228 if (((attr->ia_valid & ATTR_UID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETUID)) || 229 ((attr->ia_valid & ATTR_GID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETGID)) || 230 ((attr->ia_valid & ATTR_MODE) && 231 (AFFS_SB(inode->i_sb)->s_flags & (SF_SETMODE | SF_IMMUTABLE)))) { 232 if (!(AFFS_SB(inode->i_sb)->s_flags & SF_QUIET)) 233 error = -EPERM; 234 goto out; 235 } 236 237 error = inode_setattr(inode, attr); 238 if (!error && (attr->ia_valid & ATTR_MODE)) 239 mode_to_prot(inode); 240 out: 241 return error; 242 } 243 244 void 245 affs_delete_inode(struct inode *inode) 246 { 247 pr_debug("AFFS: delete_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink); 248 truncate_inode_pages(&inode->i_data, 0); 249 inode->i_size = 0; 250 affs_truncate(inode); 251 clear_inode(inode); 252 affs_free_block(inode->i_sb, inode->i_ino); 253 } 254 255 void 256 affs_clear_inode(struct inode *inode) 257 { 258 unsigned long cache_page; 259 260 pr_debug("AFFS: clear_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink); 261 262 affs_free_prealloc(inode); 263 cache_page = (unsigned long)AFFS_I(inode)->i_lc; 264 if (cache_page) { 265 pr_debug("AFFS: freeing ext cache\n"); 266 AFFS_I(inode)->i_lc = NULL; 267 AFFS_I(inode)->i_ac = NULL; 268 free_page(cache_page); 269 } 270 affs_brelse(AFFS_I(inode)->i_ext_bh); 271 AFFS_I(inode)->i_ext_last = ~1; 272 AFFS_I(inode)->i_ext_bh = NULL; 273 } 274 275 struct inode * 276 affs_new_inode(struct inode *dir) 277 { 278 struct super_block *sb = dir->i_sb; 279 struct inode *inode; 280 u32 block; 281 struct buffer_head *bh; 282 283 if (!(inode = new_inode(sb))) 284 goto err_inode; 285 286 if (!(block = affs_alloc_block(dir, dir->i_ino))) 287 goto err_block; 288 289 bh = affs_getzeroblk(sb, block); 290 if (!bh) 291 goto err_bh; 292 mark_buffer_dirty_inode(bh, inode); 293 affs_brelse(bh); 294 295 inode->i_uid = current_fsuid(); 296 inode->i_gid = current_fsgid(); 297 inode->i_ino = block; 298 inode->i_nlink = 1; 299 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; 300 atomic_set(&AFFS_I(inode)->i_opencnt, 0); 301 AFFS_I(inode)->i_blkcnt = 0; 302 AFFS_I(inode)->i_lc = NULL; 303 AFFS_I(inode)->i_lc_size = 0; 304 AFFS_I(inode)->i_lc_shift = 0; 305 AFFS_I(inode)->i_lc_mask = 0; 306 AFFS_I(inode)->i_ac = NULL; 307 AFFS_I(inode)->i_ext_bh = NULL; 308 AFFS_I(inode)->mmu_private = 0; 309 AFFS_I(inode)->i_protect = 0; 310 AFFS_I(inode)->i_lastalloc = 0; 311 AFFS_I(inode)->i_pa_cnt = 0; 312 AFFS_I(inode)->i_extcnt = 1; 313 AFFS_I(inode)->i_ext_last = ~1; 314 315 insert_inode_hash(inode); 316 317 return inode; 318 319 err_bh: 320 affs_free_block(sb, block); 321 err_block: 322 iput(inode); 323 err_inode: 324 return NULL; 325 } 326 327 /* 328 * Add an entry to a directory. Create the header block 329 * and insert it into the hash table. 330 */ 331 332 int 333 affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type) 334 { 335 struct super_block *sb = dir->i_sb; 336 struct buffer_head *inode_bh = NULL; 337 struct buffer_head *bh = NULL; 338 u32 block = 0; 339 int retval; 340 341 pr_debug("AFFS: add_entry(dir=%u, inode=%u, \"%*s\", type=%d)\n", (u32)dir->i_ino, 342 (u32)inode->i_ino, (int)dentry->d_name.len, dentry->d_name.name, type); 343 344 retval = -EIO; 345 bh = affs_bread(sb, inode->i_ino); 346 if (!bh) 347 goto done; 348 349 affs_lock_link(inode); 350 switch (type) { 351 case ST_LINKFILE: 352 case ST_LINKDIR: 353 retval = -ENOSPC; 354 block = affs_alloc_block(dir, dir->i_ino); 355 if (!block) 356 goto err; 357 retval = -EIO; 358 inode_bh = bh; 359 bh = affs_getzeroblk(sb, block); 360 if (!bh) 361 goto err; 362 break; 363 default: 364 break; 365 } 366 367 AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT); 368 AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr); 369 affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry); 370 AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type); 371 AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino); 372 373 if (inode_bh) { 374 __be32 chain; 375 chain = AFFS_TAIL(sb, inode_bh)->link_chain; 376 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino); 377 AFFS_TAIL(sb, bh)->link_chain = chain; 378 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block); 379 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain)); 380 mark_buffer_dirty_inode(inode_bh, inode); 381 inode->i_nlink = 2; 382 atomic_inc(&inode->i_count); 383 } 384 affs_fix_checksum(sb, bh); 385 mark_buffer_dirty_inode(bh, inode); 386 dentry->d_fsdata = (void *)(long)bh->b_blocknr; 387 388 affs_lock_dir(dir); 389 retval = affs_insert_hash(dir, bh); 390 mark_buffer_dirty_inode(bh, inode); 391 affs_unlock_dir(dir); 392 affs_unlock_link(inode); 393 394 d_instantiate(dentry, inode); 395 done: 396 affs_brelse(inode_bh); 397 affs_brelse(bh); 398 return retval; 399 err: 400 if (block) 401 affs_free_block(sb, block); 402 affs_unlock_link(inode); 403 goto done; 404 } 405