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 (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 || sbi->s_flags & SF_SETUID) 76 inode->i_uid = sbi->s_uid; 77 else if (id == 0xFFFF && 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 || sbi->s_flags & SF_SETGID) 84 inode->i_gid = sbi->s_gid; 85 else if (id == 0xFFFF && 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 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 = (sbi->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops; 137 inode->i_op = &affs_file_inode_operations; 138 inode->i_fop = &affs_file_operations; 139 break; 140 case ST_SOFTLINK: 141 inode->i_mode |= S_IFLNK; 142 inode->i_op = &affs_symlink_inode_operations; 143 inode->i_data.a_ops = &affs_symlink_aops; 144 break; 145 } 146 147 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec 148 = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) + 149 be32_to_cpu(tail->change.mins) * 60 + 150 be32_to_cpu(tail->change.ticks) / 50 + 151 ((8 * 365 + 2) * 24 * 60 * 60)) + 152 sys_tz.tz_minuteswest * 60; 153 inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0; 154 affs_brelse(bh); 155 unlock_new_inode(inode); 156 return inode; 157 158 bad_inode: 159 affs_brelse(bh); 160 iget_failed(inode); 161 return ERR_PTR(-EIO); 162 } 163 164 int 165 affs_write_inode(struct inode *inode, struct writeback_control *wbc) 166 { 167 struct super_block *sb = inode->i_sb; 168 struct buffer_head *bh; 169 struct affs_tail *tail; 170 uid_t uid; 171 gid_t gid; 172 173 pr_debug("write_inode(%lu)\n", inode->i_ino); 174 175 if (!inode->i_nlink) 176 // possibly free block 177 return 0; 178 bh = affs_bread(sb, inode->i_ino); 179 if (!bh) { 180 affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino); 181 return -EIO; 182 } 183 tail = AFFS_TAIL(sb, bh); 184 if (tail->stype == cpu_to_be32(ST_ROOT)) { 185 secs_to_datestamp(inode->i_mtime.tv_sec,&AFFS_ROOT_TAIL(sb, bh)->root_change); 186 } else { 187 tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect); 188 tail->size = cpu_to_be32(inode->i_size); 189 secs_to_datestamp(inode->i_mtime.tv_sec,&tail->change); 190 if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) { 191 uid = i_uid_read(inode); 192 gid = i_gid_read(inode); 193 if (AFFS_SB(sb)->s_flags & SF_MUFS) { 194 if (uid == 0 || uid == 0xFFFF) 195 uid = uid ^ ~0; 196 if (gid == 0 || gid == 0xFFFF) 197 gid = gid ^ ~0; 198 } 199 if (!(AFFS_SB(sb)->s_flags & SF_SETUID)) 200 tail->uid = cpu_to_be16(uid); 201 if (!(AFFS_SB(sb)->s_flags & SF_SETGID)) 202 tail->gid = cpu_to_be16(gid); 203 } 204 } 205 affs_fix_checksum(sb, bh); 206 mark_buffer_dirty_inode(bh, inode); 207 affs_brelse(bh); 208 affs_free_prealloc(inode); 209 return 0; 210 } 211 212 int 213 affs_notify_change(struct dentry *dentry, struct iattr *attr) 214 { 215 struct inode *inode = d_inode(dentry); 216 int error; 217 218 pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid); 219 220 error = inode_change_ok(inode,attr); 221 if (error) 222 goto out; 223 224 if (((attr->ia_valid & ATTR_UID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETUID)) || 225 ((attr->ia_valid & ATTR_GID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETGID)) || 226 ((attr->ia_valid & ATTR_MODE) && 227 (AFFS_SB(inode->i_sb)->s_flags & (SF_SETMODE | SF_IMMUTABLE)))) { 228 if (!(AFFS_SB(inode->i_sb)->s_flags & SF_QUIET)) 229 error = -EPERM; 230 goto out; 231 } 232 233 if ((attr->ia_valid & ATTR_SIZE) && 234 attr->ia_size != i_size_read(inode)) { 235 error = inode_newsize_ok(inode, attr->ia_size); 236 if (error) 237 return error; 238 239 truncate_setsize(inode, attr->ia_size); 240 affs_truncate(inode); 241 } 242 243 setattr_copy(inode, attr); 244 mark_inode_dirty(inode); 245 246 if (attr->ia_valid & ATTR_MODE) 247 mode_to_prot(inode); 248 out: 249 return error; 250 } 251 252 void 253 affs_evict_inode(struct inode *inode) 254 { 255 unsigned long cache_page; 256 pr_debug("evict_inode(ino=%lu, nlink=%u)\n", 257 inode->i_ino, inode->i_nlink); 258 truncate_inode_pages_final(&inode->i_data); 259 260 if (!inode->i_nlink) { 261 inode->i_size = 0; 262 affs_truncate(inode); 263 } 264 265 invalidate_inode_buffers(inode); 266 clear_inode(inode); 267 affs_free_prealloc(inode); 268 cache_page = (unsigned long)AFFS_I(inode)->i_lc; 269 if (cache_page) { 270 pr_debug("freeing ext cache\n"); 271 AFFS_I(inode)->i_lc = NULL; 272 AFFS_I(inode)->i_ac = NULL; 273 free_page(cache_page); 274 } 275 affs_brelse(AFFS_I(inode)->i_ext_bh); 276 AFFS_I(inode)->i_ext_last = ~1; 277 AFFS_I(inode)->i_ext_bh = NULL; 278 279 if (!inode->i_nlink) 280 affs_free_block(inode->i_sb, inode->i_ino); 281 } 282 283 struct inode * 284 affs_new_inode(struct inode *dir) 285 { 286 struct super_block *sb = dir->i_sb; 287 struct inode *inode; 288 u32 block; 289 struct buffer_head *bh; 290 291 if (!(inode = new_inode(sb))) 292 goto err_inode; 293 294 if (!(block = affs_alloc_block(dir, dir->i_ino))) 295 goto err_block; 296 297 bh = affs_getzeroblk(sb, block); 298 if (!bh) 299 goto err_bh; 300 mark_buffer_dirty_inode(bh, inode); 301 affs_brelse(bh); 302 303 inode->i_uid = current_fsuid(); 304 inode->i_gid = current_fsgid(); 305 inode->i_ino = block; 306 set_nlink(inode, 1); 307 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; 308 atomic_set(&AFFS_I(inode)->i_opencnt, 0); 309 AFFS_I(inode)->i_blkcnt = 0; 310 AFFS_I(inode)->i_lc = NULL; 311 AFFS_I(inode)->i_lc_size = 0; 312 AFFS_I(inode)->i_lc_shift = 0; 313 AFFS_I(inode)->i_lc_mask = 0; 314 AFFS_I(inode)->i_ac = NULL; 315 AFFS_I(inode)->i_ext_bh = NULL; 316 AFFS_I(inode)->mmu_private = 0; 317 AFFS_I(inode)->i_protect = 0; 318 AFFS_I(inode)->i_lastalloc = 0; 319 AFFS_I(inode)->i_pa_cnt = 0; 320 AFFS_I(inode)->i_extcnt = 1; 321 AFFS_I(inode)->i_ext_last = ~1; 322 323 insert_inode_hash(inode); 324 325 return inode; 326 327 err_bh: 328 affs_free_block(sb, block); 329 err_block: 330 iput(inode); 331 err_inode: 332 return NULL; 333 } 334 335 /* 336 * Add an entry to a directory. Create the header block 337 * and insert it into the hash table. 338 */ 339 340 int 341 affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type) 342 { 343 struct super_block *sb = dir->i_sb; 344 struct buffer_head *inode_bh = NULL; 345 struct buffer_head *bh = NULL; 346 u32 block = 0; 347 int retval; 348 349 pr_debug("%s(dir=%lu, inode=%lu, \"%pd\", type=%d)\n", __func__, 350 dir->i_ino, inode->i_ino, dentry, type); 351 352 retval = -EIO; 353 bh = affs_bread(sb, inode->i_ino); 354 if (!bh) 355 goto done; 356 357 affs_lock_link(inode); 358 switch (type) { 359 case ST_LINKFILE: 360 case ST_LINKDIR: 361 retval = -ENOSPC; 362 block = affs_alloc_block(dir, dir->i_ino); 363 if (!block) 364 goto err; 365 retval = -EIO; 366 inode_bh = bh; 367 bh = affs_getzeroblk(sb, block); 368 if (!bh) 369 goto err; 370 break; 371 default: 372 break; 373 } 374 375 AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT); 376 AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr); 377 affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry); 378 AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type); 379 AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino); 380 381 if (inode_bh) { 382 __be32 chain; 383 chain = AFFS_TAIL(sb, inode_bh)->link_chain; 384 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino); 385 AFFS_TAIL(sb, bh)->link_chain = chain; 386 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block); 387 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain)); 388 mark_buffer_dirty_inode(inode_bh, inode); 389 set_nlink(inode, 2); 390 ihold(inode); 391 } 392 affs_fix_checksum(sb, bh); 393 mark_buffer_dirty_inode(bh, inode); 394 dentry->d_fsdata = (void *)(long)bh->b_blocknr; 395 396 affs_lock_dir(dir); 397 retval = affs_insert_hash(dir, bh); 398 mark_buffer_dirty_inode(bh, inode); 399 affs_unlock_dir(dir); 400 affs_unlock_link(inode); 401 402 d_instantiate(dentry, inode); 403 done: 404 affs_brelse(inode_bh); 405 affs_brelse(bh); 406 return retval; 407 err: 408 if (block) 409 affs_free_block(sb, block); 410 affs_unlock_link(inode); 411 goto done; 412 } 413