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