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