1 /* 2 * linux/fs/hpfs/dnode.c 3 * 4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 5 * 6 * handling directory dnode tree - adding, deleteing & searching for dirents 7 */ 8 9 #include "hpfs_fn.h" 10 11 static loff_t get_pos(struct dnode *d, struct hpfs_dirent *fde) 12 { 13 struct hpfs_dirent *de; 14 struct hpfs_dirent *de_end = dnode_end_de(d); 15 int i = 1; 16 for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) { 17 if (de == fde) return ((loff_t) le32_to_cpu(d->self) << 4) | (loff_t)i; 18 i++; 19 } 20 pr_info("%s(): not_found\n", __func__); 21 return ((loff_t)le32_to_cpu(d->self) << 4) | (loff_t)1; 22 } 23 24 int hpfs_add_pos(struct inode *inode, loff_t *pos) 25 { 26 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); 27 int i = 0; 28 loff_t **ppos; 29 30 if (hpfs_inode->i_rddir_off) 31 for (; hpfs_inode->i_rddir_off[i]; i++) 32 if (hpfs_inode->i_rddir_off[i] == pos) 33 return 0; 34 if (!(i&0x0f)) { 35 if (!(ppos = kmalloc((i+0x11) * sizeof(loff_t*), GFP_NOFS))) { 36 pr_err("out of memory for position list\n"); 37 return -ENOMEM; 38 } 39 if (hpfs_inode->i_rddir_off) { 40 memcpy(ppos, hpfs_inode->i_rddir_off, i * sizeof(loff_t)); 41 kfree(hpfs_inode->i_rddir_off); 42 } 43 hpfs_inode->i_rddir_off = ppos; 44 } 45 hpfs_inode->i_rddir_off[i] = pos; 46 hpfs_inode->i_rddir_off[i + 1] = NULL; 47 return 0; 48 } 49 50 void hpfs_del_pos(struct inode *inode, loff_t *pos) 51 { 52 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); 53 loff_t **i, **j; 54 55 if (!hpfs_inode->i_rddir_off) goto not_f; 56 for (i = hpfs_inode->i_rddir_off; *i; i++) if (*i == pos) goto fnd; 57 goto not_f; 58 fnd: 59 for (j = i + 1; *j; j++) ; 60 *i = *(j - 1); 61 *(j - 1) = NULL; 62 if (j - 1 == hpfs_inode->i_rddir_off) { 63 kfree(hpfs_inode->i_rddir_off); 64 hpfs_inode->i_rddir_off = NULL; 65 } 66 return; 67 not_f: 68 /*pr_warn("position pointer %p->%08x not found\n", 69 pos, (int)*pos);*/ 70 return; 71 } 72 73 static void for_all_poss(struct inode *inode, void (*f)(loff_t *, loff_t, loff_t), 74 loff_t p1, loff_t p2) 75 { 76 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); 77 loff_t **i; 78 79 if (!hpfs_inode->i_rddir_off) return; 80 for (i = hpfs_inode->i_rddir_off; *i; i++) (*f)(*i, p1, p2); 81 return; 82 } 83 84 static void hpfs_pos_subst(loff_t *p, loff_t f, loff_t t) 85 { 86 if (*p == f) *p = t; 87 } 88 89 /*void hpfs_hpfs_pos_substd(loff_t *p, loff_t f, loff_t t) 90 { 91 if ((*p & ~0x3f) == (f & ~0x3f)) *p = (t & ~0x3f) | (*p & 0x3f); 92 }*/ 93 94 static void hpfs_pos_ins(loff_t *p, loff_t d, loff_t c) 95 { 96 if ((*p & ~0x3f) == (d & ~0x3f) && (*p & 0x3f) >= (d & 0x3f)) { 97 int n = (*p & 0x3f) + c; 98 if (n > 0x3f) 99 pr_err("%s(): %08x + %d\n", 100 __func__, (int)*p, (int)c >> 8); 101 else 102 *p = (*p & ~0x3f) | n; 103 } 104 } 105 106 static void hpfs_pos_del(loff_t *p, loff_t d, loff_t c) 107 { 108 if ((*p & ~0x3f) == (d & ~0x3f) && (*p & 0x3f) >= (d & 0x3f)) { 109 int n = (*p & 0x3f) - c; 110 if (n < 1) 111 pr_err("%s(): %08x - %d\n", 112 __func__, (int)*p, (int)c >> 8); 113 else 114 *p = (*p & ~0x3f) | n; 115 } 116 } 117 118 static struct hpfs_dirent *dnode_pre_last_de(struct dnode *d) 119 { 120 struct hpfs_dirent *de, *de_end, *dee = NULL, *deee = NULL; 121 de_end = dnode_end_de(d); 122 for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) { 123 deee = dee; dee = de; 124 } 125 return deee; 126 } 127 128 static struct hpfs_dirent *dnode_last_de(struct dnode *d) 129 { 130 struct hpfs_dirent *de, *de_end, *dee = NULL; 131 de_end = dnode_end_de(d); 132 for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) { 133 dee = de; 134 } 135 return dee; 136 } 137 138 static void set_last_pointer(struct super_block *s, struct dnode *d, dnode_secno ptr) 139 { 140 struct hpfs_dirent *de; 141 if (!(de = dnode_last_de(d))) { 142 hpfs_error(s, "set_last_pointer: empty dnode %08x", le32_to_cpu(d->self)); 143 return; 144 } 145 if (hpfs_sb(s)->sb_chk) { 146 if (de->down) { 147 hpfs_error(s, "set_last_pointer: dnode %08x has already last pointer %08x", 148 le32_to_cpu(d->self), de_down_pointer(de)); 149 return; 150 } 151 if (le16_to_cpu(de->length) != 32) { 152 hpfs_error(s, "set_last_pointer: bad last dirent in dnode %08x", le32_to_cpu(d->self)); 153 return; 154 } 155 } 156 if (ptr) { 157 le32_add_cpu(&d->first_free, 4); 158 if (le32_to_cpu(d->first_free) > 2048) { 159 hpfs_error(s, "set_last_pointer: too long dnode %08x", le32_to_cpu(d->self)); 160 le32_add_cpu(&d->first_free, -4); 161 return; 162 } 163 de->length = cpu_to_le16(36); 164 de->down = 1; 165 *(__le32 *)((char *)de + 32) = cpu_to_le32(ptr); 166 } 167 } 168 169 /* Add an entry to dnode and don't care if it grows over 2048 bytes */ 170 171 struct hpfs_dirent *hpfs_add_de(struct super_block *s, struct dnode *d, 172 const unsigned char *name, 173 unsigned namelen, secno down_ptr) 174 { 175 struct hpfs_dirent *de; 176 struct hpfs_dirent *de_end = dnode_end_de(d); 177 unsigned d_size = de_size(namelen, down_ptr); 178 for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) { 179 int c = hpfs_compare_names(s, name, namelen, de->name, de->namelen, de->last); 180 if (!c) { 181 hpfs_error(s, "name (%c,%d) already exists in dnode %08x", *name, namelen, le32_to_cpu(d->self)); 182 return NULL; 183 } 184 if (c < 0) break; 185 } 186 memmove((char *)de + d_size, de, (char *)de_end - (char *)de); 187 memset(de, 0, d_size); 188 if (down_ptr) { 189 *(__le32 *)((char *)de + d_size - 4) = cpu_to_le32(down_ptr); 190 de->down = 1; 191 } 192 de->length = cpu_to_le16(d_size); 193 de->not_8x3 = hpfs_is_name_long(name, namelen); 194 de->namelen = namelen; 195 memcpy(de->name, name, namelen); 196 le32_add_cpu(&d->first_free, d_size); 197 return de; 198 } 199 200 /* Delete dirent and don't care about its subtree */ 201 202 static void hpfs_delete_de(struct super_block *s, struct dnode *d, 203 struct hpfs_dirent *de) 204 { 205 if (de->last) { 206 hpfs_error(s, "attempt to delete last dirent in dnode %08x", le32_to_cpu(d->self)); 207 return; 208 } 209 d->first_free = cpu_to_le32(le32_to_cpu(d->first_free) - le16_to_cpu(de->length)); 210 memmove(de, de_next_de(de), le32_to_cpu(d->first_free) + (char *)d - (char *)de); 211 } 212 213 static void fix_up_ptrs(struct super_block *s, struct dnode *d) 214 { 215 struct hpfs_dirent *de; 216 struct hpfs_dirent *de_end = dnode_end_de(d); 217 dnode_secno dno = le32_to_cpu(d->self); 218 for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) 219 if (de->down) { 220 struct quad_buffer_head qbh; 221 struct dnode *dd; 222 if ((dd = hpfs_map_dnode(s, de_down_pointer(de), &qbh))) { 223 if (le32_to_cpu(dd->up) != dno || dd->root_dnode) { 224 dd->up = cpu_to_le32(dno); 225 dd->root_dnode = 0; 226 hpfs_mark_4buffers_dirty(&qbh); 227 } 228 hpfs_brelse4(&qbh); 229 } 230 } 231 } 232 233 /* Add an entry to dnode and do dnode splitting if required */ 234 235 static int hpfs_add_to_dnode(struct inode *i, dnode_secno dno, 236 const unsigned char *name, unsigned namelen, 237 struct hpfs_dirent *new_de, dnode_secno down_ptr) 238 { 239 struct quad_buffer_head qbh, qbh1, qbh2; 240 struct dnode *d, *ad, *rd, *nd = NULL; 241 dnode_secno adno, rdno; 242 struct hpfs_dirent *de; 243 struct hpfs_dirent nde; 244 unsigned char *nname; 245 int h; 246 int pos; 247 struct buffer_head *bh; 248 struct fnode *fnode; 249 int c1, c2 = 0; 250 if (!(nname = kmalloc(256, GFP_NOFS))) { 251 pr_err("out of memory, can't add to dnode\n"); 252 return 1; 253 } 254 go_up: 255 if (namelen >= 256) { 256 hpfs_error(i->i_sb, "%s(): namelen == %d", __func__, namelen); 257 kfree(nd); 258 kfree(nname); 259 return 1; 260 } 261 if (!(d = hpfs_map_dnode(i->i_sb, dno, &qbh))) { 262 kfree(nd); 263 kfree(nname); 264 return 1; 265 } 266 go_up_a: 267 if (hpfs_sb(i->i_sb)->sb_chk) 268 if (hpfs_stop_cycles(i->i_sb, dno, &c1, &c2, "hpfs_add_to_dnode")) { 269 hpfs_brelse4(&qbh); 270 kfree(nd); 271 kfree(nname); 272 return 1; 273 } 274 if (le32_to_cpu(d->first_free) + de_size(namelen, down_ptr) <= 2048) { 275 loff_t t; 276 copy_de(de=hpfs_add_de(i->i_sb, d, name, namelen, down_ptr), new_de); 277 t = get_pos(d, de); 278 for_all_poss(i, hpfs_pos_ins, t, 1); 279 for_all_poss(i, hpfs_pos_subst, 4, t); 280 for_all_poss(i, hpfs_pos_subst, 5, t + 1); 281 hpfs_mark_4buffers_dirty(&qbh); 282 hpfs_brelse4(&qbh); 283 kfree(nd); 284 kfree(nname); 285 return 0; 286 } 287 if (!nd) if (!(nd = kmalloc(0x924, GFP_NOFS))) { 288 /* 0x924 is a max size of dnode after adding a dirent with 289 max name length. We alloc this only once. There must 290 not be any error while splitting dnodes, otherwise the 291 whole directory, not only file we're adding, would 292 be lost. */ 293 pr_err("out of memory for dnode splitting\n"); 294 hpfs_brelse4(&qbh); 295 kfree(nname); 296 return 1; 297 } 298 memcpy(nd, d, le32_to_cpu(d->first_free)); 299 copy_de(de = hpfs_add_de(i->i_sb, nd, name, namelen, down_ptr), new_de); 300 for_all_poss(i, hpfs_pos_ins, get_pos(nd, de), 1); 301 h = ((char *)dnode_last_de(nd) - (char *)nd) / 2 + 10; 302 if (!(ad = hpfs_alloc_dnode(i->i_sb, le32_to_cpu(d->up), &adno, &qbh1))) { 303 hpfs_error(i->i_sb, "unable to alloc dnode - dnode tree will be corrupted"); 304 hpfs_brelse4(&qbh); 305 kfree(nd); 306 kfree(nname); 307 return 1; 308 } 309 i->i_size += 2048; 310 i->i_blocks += 4; 311 pos = 1; 312 for (de = dnode_first_de(nd); (char *)de_next_de(de) - (char *)nd < h; de = de_next_de(de)) { 313 copy_de(hpfs_add_de(i->i_sb, ad, de->name, de->namelen, de->down ? de_down_pointer(de) : 0), de); 314 for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | pos, ((loff_t)adno << 4) | pos); 315 pos++; 316 } 317 copy_de(new_de = &nde, de); 318 memcpy(nname, de->name, de->namelen); 319 name = nname; 320 namelen = de->namelen; 321 for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | pos, 4); 322 down_ptr = adno; 323 set_last_pointer(i->i_sb, ad, de->down ? de_down_pointer(de) : 0); 324 de = de_next_de(de); 325 memmove((char *)nd + 20, de, le32_to_cpu(nd->first_free) + (char *)nd - (char *)de); 326 le32_add_cpu(&nd->first_free, -((char *)de - (char *)nd - 20)); 327 memcpy(d, nd, le32_to_cpu(nd->first_free)); 328 for_all_poss(i, hpfs_pos_del, (loff_t)dno << 4, pos); 329 fix_up_ptrs(i->i_sb, ad); 330 if (!d->root_dnode) { 331 ad->up = d->up; 332 dno = le32_to_cpu(ad->up); 333 hpfs_mark_4buffers_dirty(&qbh); 334 hpfs_brelse4(&qbh); 335 hpfs_mark_4buffers_dirty(&qbh1); 336 hpfs_brelse4(&qbh1); 337 goto go_up; 338 } 339 if (!(rd = hpfs_alloc_dnode(i->i_sb, le32_to_cpu(d->up), &rdno, &qbh2))) { 340 hpfs_error(i->i_sb, "unable to alloc dnode - dnode tree will be corrupted"); 341 hpfs_brelse4(&qbh); 342 hpfs_brelse4(&qbh1); 343 kfree(nd); 344 kfree(nname); 345 return 1; 346 } 347 i->i_size += 2048; 348 i->i_blocks += 4; 349 rd->root_dnode = 1; 350 rd->up = d->up; 351 if (!(fnode = hpfs_map_fnode(i->i_sb, le32_to_cpu(d->up), &bh))) { 352 hpfs_free_dnode(i->i_sb, rdno); 353 hpfs_brelse4(&qbh); 354 hpfs_brelse4(&qbh1); 355 hpfs_brelse4(&qbh2); 356 kfree(nd); 357 kfree(nname); 358 return 1; 359 } 360 fnode->u.external[0].disk_secno = cpu_to_le32(rdno); 361 mark_buffer_dirty(bh); 362 brelse(bh); 363 hpfs_i(i)->i_dno = rdno; 364 d->up = ad->up = cpu_to_le32(rdno); 365 d->root_dnode = ad->root_dnode = 0; 366 hpfs_mark_4buffers_dirty(&qbh); 367 hpfs_brelse4(&qbh); 368 hpfs_mark_4buffers_dirty(&qbh1); 369 hpfs_brelse4(&qbh1); 370 qbh = qbh2; 371 set_last_pointer(i->i_sb, rd, dno); 372 dno = rdno; 373 d = rd; 374 goto go_up_a; 375 } 376 377 /* 378 * Add an entry to directory btree. 379 * I hate such crazy directory structure. 380 * It's easy to read but terrible to write. 381 * I wrote this directory code 4 times. 382 * I hope, now it's finally bug-free. 383 */ 384 385 int hpfs_add_dirent(struct inode *i, 386 const unsigned char *name, unsigned namelen, 387 struct hpfs_dirent *new_de) 388 { 389 struct hpfs_inode_info *hpfs_inode = hpfs_i(i); 390 struct dnode *d; 391 struct hpfs_dirent *de, *de_end; 392 struct quad_buffer_head qbh; 393 dnode_secno dno; 394 int c; 395 int c1, c2 = 0; 396 dno = hpfs_inode->i_dno; 397 down: 398 if (hpfs_sb(i->i_sb)->sb_chk) 399 if (hpfs_stop_cycles(i->i_sb, dno, &c1, &c2, "hpfs_add_dirent")) return 1; 400 if (!(d = hpfs_map_dnode(i->i_sb, dno, &qbh))) return 1; 401 de_end = dnode_end_de(d); 402 for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) { 403 if (!(c = hpfs_compare_names(i->i_sb, name, namelen, de->name, de->namelen, de->last))) { 404 hpfs_brelse4(&qbh); 405 return -1; 406 } 407 if (c < 0) { 408 if (de->down) { 409 dno = de_down_pointer(de); 410 hpfs_brelse4(&qbh); 411 goto down; 412 } 413 break; 414 } 415 } 416 hpfs_brelse4(&qbh); 417 if (hpfs_check_free_dnodes(i->i_sb, FREE_DNODES_ADD)) { 418 c = 1; 419 goto ret; 420 } 421 i->i_version++; 422 c = hpfs_add_to_dnode(i, dno, name, namelen, new_de, 0); 423 ret: 424 return c; 425 } 426 427 /* 428 * Find dirent with higher name in 'from' subtree and move it to 'to' dnode. 429 * Return the dnode we moved from (to be checked later if it's empty) 430 */ 431 432 static secno move_to_top(struct inode *i, dnode_secno from, dnode_secno to) 433 { 434 dnode_secno dno, ddno; 435 dnode_secno chk_up = to; 436 struct dnode *dnode; 437 struct quad_buffer_head qbh; 438 struct hpfs_dirent *de, *nde; 439 int a; 440 loff_t t; 441 int c1, c2 = 0; 442 dno = from; 443 while (1) { 444 if (hpfs_sb(i->i_sb)->sb_chk) 445 if (hpfs_stop_cycles(i->i_sb, dno, &c1, &c2, "move_to_top")) 446 return 0; 447 if (!(dnode = hpfs_map_dnode(i->i_sb, dno, &qbh))) return 0; 448 if (hpfs_sb(i->i_sb)->sb_chk) { 449 if (le32_to_cpu(dnode->up) != chk_up) { 450 hpfs_error(i->i_sb, "move_to_top: up pointer from %08x should be %08x, is %08x", 451 dno, chk_up, le32_to_cpu(dnode->up)); 452 hpfs_brelse4(&qbh); 453 return 0; 454 } 455 chk_up = dno; 456 } 457 if (!(de = dnode_last_de(dnode))) { 458 hpfs_error(i->i_sb, "move_to_top: dnode %08x has no last de", dno); 459 hpfs_brelse4(&qbh); 460 return 0; 461 } 462 if (!de->down) break; 463 dno = de_down_pointer(de); 464 hpfs_brelse4(&qbh); 465 } 466 while (!(de = dnode_pre_last_de(dnode))) { 467 dnode_secno up = le32_to_cpu(dnode->up); 468 hpfs_brelse4(&qbh); 469 hpfs_free_dnode(i->i_sb, dno); 470 i->i_size -= 2048; 471 i->i_blocks -= 4; 472 for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | 1, 5); 473 if (up == to) return to; 474 if (!(dnode = hpfs_map_dnode(i->i_sb, up, &qbh))) return 0; 475 if (dnode->root_dnode) { 476 hpfs_error(i->i_sb, "move_to_top: got to root_dnode while moving from %08x to %08x", from, to); 477 hpfs_brelse4(&qbh); 478 return 0; 479 } 480 de = dnode_last_de(dnode); 481 if (!de || !de->down) { 482 hpfs_error(i->i_sb, "move_to_top: dnode %08x doesn't point down to %08x", up, dno); 483 hpfs_brelse4(&qbh); 484 return 0; 485 } 486 le32_add_cpu(&dnode->first_free, -4); 487 le16_add_cpu(&de->length, -4); 488 de->down = 0; 489 hpfs_mark_4buffers_dirty(&qbh); 490 dno = up; 491 } 492 t = get_pos(dnode, de); 493 for_all_poss(i, hpfs_pos_subst, t, 4); 494 for_all_poss(i, hpfs_pos_subst, t + 1, 5); 495 if (!(nde = kmalloc(le16_to_cpu(de->length), GFP_NOFS))) { 496 hpfs_error(i->i_sb, "out of memory for dirent - directory will be corrupted"); 497 hpfs_brelse4(&qbh); 498 return 0; 499 } 500 memcpy(nde, de, le16_to_cpu(de->length)); 501 ddno = de->down ? de_down_pointer(de) : 0; 502 hpfs_delete_de(i->i_sb, dnode, de); 503 set_last_pointer(i->i_sb, dnode, ddno); 504 hpfs_mark_4buffers_dirty(&qbh); 505 hpfs_brelse4(&qbh); 506 a = hpfs_add_to_dnode(i, to, nde->name, nde->namelen, nde, from); 507 kfree(nde); 508 if (a) return 0; 509 return dno; 510 } 511 512 /* 513 * Check if a dnode is empty and delete it from the tree 514 * (chkdsk doesn't like empty dnodes) 515 */ 516 517 static void delete_empty_dnode(struct inode *i, dnode_secno dno) 518 { 519 struct hpfs_inode_info *hpfs_inode = hpfs_i(i); 520 struct quad_buffer_head qbh; 521 struct dnode *dnode; 522 dnode_secno down, up, ndown; 523 int p; 524 struct hpfs_dirent *de; 525 int c1, c2 = 0; 526 try_it_again: 527 if (hpfs_stop_cycles(i->i_sb, dno, &c1, &c2, "delete_empty_dnode")) return; 528 if (!(dnode = hpfs_map_dnode(i->i_sb, dno, &qbh))) return; 529 if (le32_to_cpu(dnode->first_free) > 56) goto end; 530 if (le32_to_cpu(dnode->first_free) == 52 || le32_to_cpu(dnode->first_free) == 56) { 531 struct hpfs_dirent *de_end; 532 int root = dnode->root_dnode; 533 up = le32_to_cpu(dnode->up); 534 de = dnode_first_de(dnode); 535 down = de->down ? de_down_pointer(de) : 0; 536 if (hpfs_sb(i->i_sb)->sb_chk) if (root && !down) { 537 hpfs_error(i->i_sb, "delete_empty_dnode: root dnode %08x is empty", dno); 538 goto end; 539 } 540 hpfs_brelse4(&qbh); 541 hpfs_free_dnode(i->i_sb, dno); 542 i->i_size -= 2048; 543 i->i_blocks -= 4; 544 if (root) { 545 struct fnode *fnode; 546 struct buffer_head *bh; 547 struct dnode *d1; 548 struct quad_buffer_head qbh1; 549 if (hpfs_sb(i->i_sb)->sb_chk) 550 if (up != i->i_ino) { 551 hpfs_error(i->i_sb, 552 "bad pointer to fnode, dnode %08x, pointing to %08x, should be %08lx", 553 dno, up, 554 (unsigned long)i->i_ino); 555 return; 556 } 557 if ((d1 = hpfs_map_dnode(i->i_sb, down, &qbh1))) { 558 d1->up = cpu_to_le32(up); 559 d1->root_dnode = 1; 560 hpfs_mark_4buffers_dirty(&qbh1); 561 hpfs_brelse4(&qbh1); 562 } 563 if ((fnode = hpfs_map_fnode(i->i_sb, up, &bh))) { 564 fnode->u.external[0].disk_secno = cpu_to_le32(down); 565 mark_buffer_dirty(bh); 566 brelse(bh); 567 } 568 hpfs_inode->i_dno = down; 569 for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | 1, (loff_t) 12); 570 return; 571 } 572 if (!(dnode = hpfs_map_dnode(i->i_sb, up, &qbh))) return; 573 p = 1; 574 de_end = dnode_end_de(dnode); 575 for (de = dnode_first_de(dnode); de < de_end; de = de_next_de(de), p++) 576 if (de->down) if (de_down_pointer(de) == dno) goto fnd; 577 hpfs_error(i->i_sb, "delete_empty_dnode: pointer to dnode %08x not found in dnode %08x", dno, up); 578 goto end; 579 fnd: 580 for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | 1, ((loff_t)up << 4) | p); 581 if (!down) { 582 de->down = 0; 583 le16_add_cpu(&de->length, -4); 584 le32_add_cpu(&dnode->first_free, -4); 585 memmove(de_next_de(de), (char *)de_next_de(de) + 4, 586 (char *)dnode + le32_to_cpu(dnode->first_free) - (char *)de_next_de(de)); 587 } else { 588 struct dnode *d1; 589 struct quad_buffer_head qbh1; 590 *(dnode_secno *) ((void *) de + le16_to_cpu(de->length) - 4) = down; 591 if ((d1 = hpfs_map_dnode(i->i_sb, down, &qbh1))) { 592 d1->up = cpu_to_le32(up); 593 hpfs_mark_4buffers_dirty(&qbh1); 594 hpfs_brelse4(&qbh1); 595 } 596 } 597 } else { 598 hpfs_error(i->i_sb, "delete_empty_dnode: dnode %08x, first_free == %03x", dno, le32_to_cpu(dnode->first_free)); 599 goto end; 600 } 601 602 if (!de->last) { 603 struct hpfs_dirent *de_next = de_next_de(de); 604 struct hpfs_dirent *de_cp; 605 struct dnode *d1; 606 struct quad_buffer_head qbh1; 607 if (!de_next->down) goto endm; 608 ndown = de_down_pointer(de_next); 609 if (!(de_cp = kmalloc(le16_to_cpu(de->length), GFP_NOFS))) { 610 pr_err("out of memory for dtree balancing\n"); 611 goto endm; 612 } 613 memcpy(de_cp, de, le16_to_cpu(de->length)); 614 hpfs_delete_de(i->i_sb, dnode, de); 615 hpfs_mark_4buffers_dirty(&qbh); 616 hpfs_brelse4(&qbh); 617 for_all_poss(i, hpfs_pos_subst, ((loff_t)up << 4) | p, 4); 618 for_all_poss(i, hpfs_pos_del, ((loff_t)up << 4) | p, 1); 619 if (de_cp->down) if ((d1 = hpfs_map_dnode(i->i_sb, de_down_pointer(de_cp), &qbh1))) { 620 d1->up = cpu_to_le32(ndown); 621 hpfs_mark_4buffers_dirty(&qbh1); 622 hpfs_brelse4(&qbh1); 623 } 624 hpfs_add_to_dnode(i, ndown, de_cp->name, de_cp->namelen, de_cp, de_cp->down ? de_down_pointer(de_cp) : 0); 625 /*pr_info("UP-TO-DNODE: %08x (ndown = %08x, down = %08x, dno = %08x)\n", 626 up, ndown, down, dno);*/ 627 dno = up; 628 kfree(de_cp); 629 goto try_it_again; 630 } else { 631 struct hpfs_dirent *de_prev = dnode_pre_last_de(dnode); 632 struct hpfs_dirent *de_cp; 633 struct dnode *d1; 634 struct quad_buffer_head qbh1; 635 dnode_secno dlp; 636 if (!de_prev) { 637 hpfs_error(i->i_sb, "delete_empty_dnode: empty dnode %08x", up); 638 hpfs_mark_4buffers_dirty(&qbh); 639 hpfs_brelse4(&qbh); 640 dno = up; 641 goto try_it_again; 642 } 643 if (!de_prev->down) goto endm; 644 ndown = de_down_pointer(de_prev); 645 if ((d1 = hpfs_map_dnode(i->i_sb, ndown, &qbh1))) { 646 struct hpfs_dirent *del = dnode_last_de(d1); 647 dlp = del->down ? de_down_pointer(del) : 0; 648 if (!dlp && down) { 649 if (le32_to_cpu(d1->first_free) > 2044) { 650 if (hpfs_sb(i->i_sb)->sb_chk >= 2) { 651 pr_err("unbalanced dnode tree, see hpfs.txt 4 more info\n"); 652 pr_err("terminating balancing operation\n"); 653 } 654 hpfs_brelse4(&qbh1); 655 goto endm; 656 } 657 if (hpfs_sb(i->i_sb)->sb_chk >= 2) { 658 pr_err("unbalanced dnode tree, see hpfs.txt 4 more info\n"); 659 pr_err("goin'on\n"); 660 } 661 le16_add_cpu(&del->length, 4); 662 del->down = 1; 663 le32_add_cpu(&d1->first_free, 4); 664 } 665 if (dlp && !down) { 666 le16_add_cpu(&del->length, -4); 667 del->down = 0; 668 le32_add_cpu(&d1->first_free, -4); 669 } else if (down) 670 *(__le32 *) ((void *) del + le16_to_cpu(del->length) - 4) = cpu_to_le32(down); 671 } else goto endm; 672 if (!(de_cp = kmalloc(le16_to_cpu(de_prev->length), GFP_NOFS))) { 673 pr_err("out of memory for dtree balancing\n"); 674 hpfs_brelse4(&qbh1); 675 goto endm; 676 } 677 hpfs_mark_4buffers_dirty(&qbh1); 678 hpfs_brelse4(&qbh1); 679 memcpy(de_cp, de_prev, le16_to_cpu(de_prev->length)); 680 hpfs_delete_de(i->i_sb, dnode, de_prev); 681 if (!de_prev->down) { 682 le16_add_cpu(&de_prev->length, 4); 683 de_prev->down = 1; 684 le32_add_cpu(&dnode->first_free, 4); 685 } 686 *(__le32 *) ((void *) de_prev + le16_to_cpu(de_prev->length) - 4) = cpu_to_le32(ndown); 687 hpfs_mark_4buffers_dirty(&qbh); 688 hpfs_brelse4(&qbh); 689 for_all_poss(i, hpfs_pos_subst, ((loff_t)up << 4) | (p - 1), 4); 690 for_all_poss(i, hpfs_pos_subst, ((loff_t)up << 4) | p, ((loff_t)up << 4) | (p - 1)); 691 if (down) if ((d1 = hpfs_map_dnode(i->i_sb, de_down_pointer(de), &qbh1))) { 692 d1->up = cpu_to_le32(ndown); 693 hpfs_mark_4buffers_dirty(&qbh1); 694 hpfs_brelse4(&qbh1); 695 } 696 hpfs_add_to_dnode(i, ndown, de_cp->name, de_cp->namelen, de_cp, dlp); 697 dno = up; 698 kfree(de_cp); 699 goto try_it_again; 700 } 701 endm: 702 hpfs_mark_4buffers_dirty(&qbh); 703 end: 704 hpfs_brelse4(&qbh); 705 } 706 707 708 /* Delete dirent from directory */ 709 710 int hpfs_remove_dirent(struct inode *i, dnode_secno dno, struct hpfs_dirent *de, 711 struct quad_buffer_head *qbh, int depth) 712 { 713 struct dnode *dnode = qbh->data; 714 dnode_secno down = 0; 715 loff_t t; 716 if (de->first || de->last) { 717 hpfs_error(i->i_sb, "hpfs_remove_dirent: attempt to delete first or last dirent in dnode %08x", dno); 718 hpfs_brelse4(qbh); 719 return 1; 720 } 721 if (de->down) down = de_down_pointer(de); 722 if (depth && (de->down || (de == dnode_first_de(dnode) && de_next_de(de)->last))) { 723 if (hpfs_check_free_dnodes(i->i_sb, FREE_DNODES_DEL)) { 724 hpfs_brelse4(qbh); 725 return 2; 726 } 727 } 728 i->i_version++; 729 for_all_poss(i, hpfs_pos_del, (t = get_pos(dnode, de)) + 1, 1); 730 hpfs_delete_de(i->i_sb, dnode, de); 731 hpfs_mark_4buffers_dirty(qbh); 732 hpfs_brelse4(qbh); 733 if (down) { 734 dnode_secno a = move_to_top(i, down, dno); 735 for_all_poss(i, hpfs_pos_subst, 5, t); 736 if (a) delete_empty_dnode(i, a); 737 return !a; 738 } 739 delete_empty_dnode(i, dno); 740 return 0; 741 } 742 743 void hpfs_count_dnodes(struct super_block *s, dnode_secno dno, int *n_dnodes, 744 int *n_subdirs, int *n_items) 745 { 746 struct dnode *dnode; 747 struct quad_buffer_head qbh; 748 struct hpfs_dirent *de; 749 dnode_secno ptr, odno = 0; 750 int c1, c2 = 0; 751 int d1, d2 = 0; 752 go_down: 753 if (n_dnodes) (*n_dnodes)++; 754 if (hpfs_sb(s)->sb_chk) 755 if (hpfs_stop_cycles(s, dno, &c1, &c2, "hpfs_count_dnodes #1")) return; 756 ptr = 0; 757 go_up: 758 if (!(dnode = hpfs_map_dnode(s, dno, &qbh))) return; 759 if (hpfs_sb(s)->sb_chk) if (odno && odno != -1 && le32_to_cpu(dnode->up) != odno) 760 hpfs_error(s, "hpfs_count_dnodes: bad up pointer; dnode %08x, down %08x points to %08x", odno, dno, le32_to_cpu(dnode->up)); 761 de = dnode_first_de(dnode); 762 if (ptr) while(1) { 763 if (de->down) if (de_down_pointer(de) == ptr) goto process_de; 764 if (de->last) { 765 hpfs_brelse4(&qbh); 766 hpfs_error(s, "hpfs_count_dnodes: pointer to dnode %08x not found in dnode %08x, got here from %08x", 767 ptr, dno, odno); 768 return; 769 } 770 de = de_next_de(de); 771 } 772 next_de: 773 if (de->down) { 774 odno = dno; 775 dno = de_down_pointer(de); 776 hpfs_brelse4(&qbh); 777 goto go_down; 778 } 779 process_de: 780 if (!de->first && !de->last && de->directory && n_subdirs) (*n_subdirs)++; 781 if (!de->first && !de->last && n_items) (*n_items)++; 782 if ((de = de_next_de(de)) < dnode_end_de(dnode)) goto next_de; 783 ptr = dno; 784 dno = le32_to_cpu(dnode->up); 785 if (dnode->root_dnode) { 786 hpfs_brelse4(&qbh); 787 return; 788 } 789 hpfs_brelse4(&qbh); 790 if (hpfs_sb(s)->sb_chk) 791 if (hpfs_stop_cycles(s, ptr, &d1, &d2, "hpfs_count_dnodes #2")) return; 792 odno = -1; 793 goto go_up; 794 } 795 796 static struct hpfs_dirent *map_nth_dirent(struct super_block *s, dnode_secno dno, int n, 797 struct quad_buffer_head *qbh, struct dnode **dn) 798 { 799 int i; 800 struct hpfs_dirent *de, *de_end; 801 struct dnode *dnode; 802 dnode = hpfs_map_dnode(s, dno, qbh); 803 if (!dnode) return NULL; 804 if (dn) *dn=dnode; 805 de = dnode_first_de(dnode); 806 de_end = dnode_end_de(dnode); 807 for (i = 1; de < de_end; i++, de = de_next_de(de)) { 808 if (i == n) { 809 return de; 810 } 811 if (de->last) break; 812 } 813 hpfs_brelse4(qbh); 814 hpfs_error(s, "map_nth_dirent: n too high; dnode = %08x, requested %08x", dno, n); 815 return NULL; 816 } 817 818 dnode_secno hpfs_de_as_down_as_possible(struct super_block *s, dnode_secno dno) 819 { 820 struct quad_buffer_head qbh; 821 dnode_secno d = dno; 822 dnode_secno up = 0; 823 struct hpfs_dirent *de; 824 int c1, c2 = 0; 825 826 again: 827 if (hpfs_sb(s)->sb_chk) 828 if (hpfs_stop_cycles(s, d, &c1, &c2, "hpfs_de_as_down_as_possible")) 829 return d; 830 if (!(de = map_nth_dirent(s, d, 1, &qbh, NULL))) return dno; 831 if (hpfs_sb(s)->sb_chk) 832 if (up && le32_to_cpu(((struct dnode *)qbh.data)->up) != up) 833 hpfs_error(s, "hpfs_de_as_down_as_possible: bad up pointer; dnode %08x, down %08x points to %08x", up, d, le32_to_cpu(((struct dnode *)qbh.data)->up)); 834 if (!de->down) { 835 hpfs_brelse4(&qbh); 836 return d; 837 } 838 up = d; 839 d = de_down_pointer(de); 840 hpfs_brelse4(&qbh); 841 goto again; 842 } 843 844 struct hpfs_dirent *map_pos_dirent(struct inode *inode, loff_t *posp, 845 struct quad_buffer_head *qbh) 846 { 847 loff_t pos; 848 unsigned c; 849 dnode_secno dno; 850 struct hpfs_dirent *de, *d; 851 struct hpfs_dirent *up_de; 852 struct hpfs_dirent *end_up_de; 853 struct dnode *dnode; 854 struct dnode *up_dnode; 855 struct quad_buffer_head qbh0; 856 857 pos = *posp; 858 dno = pos >> 6 << 2; 859 pos &= 077; 860 if (!(de = map_nth_dirent(inode->i_sb, dno, pos, qbh, &dnode))) 861 goto bail; 862 863 /* Going to the next dirent */ 864 if ((d = de_next_de(de)) < dnode_end_de(dnode)) { 865 if (!(++*posp & 077)) { 866 hpfs_error(inode->i_sb, 867 "map_pos_dirent: pos crossed dnode boundary; pos = %08llx", 868 (unsigned long long)*posp); 869 goto bail; 870 } 871 /* We're going down the tree */ 872 if (d->down) { 873 *posp = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, de_down_pointer(d)) << 4) + 1; 874 } 875 876 return de; 877 } 878 879 /* Going up */ 880 if (dnode->root_dnode) goto bail; 881 882 if (!(up_dnode = hpfs_map_dnode(inode->i_sb, le32_to_cpu(dnode->up), &qbh0))) 883 goto bail; 884 885 end_up_de = dnode_end_de(up_dnode); 886 c = 0; 887 for (up_de = dnode_first_de(up_dnode); up_de < end_up_de; 888 up_de = de_next_de(up_de)) { 889 if (!(++c & 077)) hpfs_error(inode->i_sb, 890 "map_pos_dirent: pos crossed dnode boundary; dnode = %08x", le32_to_cpu(dnode->up)); 891 if (up_de->down && de_down_pointer(up_de) == dno) { 892 *posp = ((loff_t) le32_to_cpu(dnode->up) << 4) + c; 893 hpfs_brelse4(&qbh0); 894 return de; 895 } 896 } 897 898 hpfs_error(inode->i_sb, "map_pos_dirent: pointer to dnode %08x not found in parent dnode %08x", 899 dno, le32_to_cpu(dnode->up)); 900 hpfs_brelse4(&qbh0); 901 902 bail: 903 *posp = 12; 904 return de; 905 } 906 907 /* Find a dirent in tree */ 908 909 struct hpfs_dirent *map_dirent(struct inode *inode, dnode_secno dno, 910 const unsigned char *name, unsigned len, 911 dnode_secno *dd, struct quad_buffer_head *qbh) 912 { 913 struct dnode *dnode; 914 struct hpfs_dirent *de; 915 struct hpfs_dirent *de_end; 916 int c1, c2 = 0; 917 918 if (!S_ISDIR(inode->i_mode)) hpfs_error(inode->i_sb, "map_dirent: not a directory\n"); 919 again: 920 if (hpfs_sb(inode->i_sb)->sb_chk) 921 if (hpfs_stop_cycles(inode->i_sb, dno, &c1, &c2, "map_dirent")) return NULL; 922 if (!(dnode = hpfs_map_dnode(inode->i_sb, dno, qbh))) return NULL; 923 924 de_end = dnode_end_de(dnode); 925 for (de = dnode_first_de(dnode); de < de_end; de = de_next_de(de)) { 926 int t = hpfs_compare_names(inode->i_sb, name, len, de->name, de->namelen, de->last); 927 if (!t) { 928 if (dd) *dd = dno; 929 return de; 930 } 931 if (t < 0) { 932 if (de->down) { 933 dno = de_down_pointer(de); 934 hpfs_brelse4(qbh); 935 goto again; 936 } 937 break; 938 } 939 } 940 hpfs_brelse4(qbh); 941 return NULL; 942 } 943 944 /* 945 * Remove empty directory. In normal cases it is only one dnode with two 946 * entries, but we must handle also such obscure cases when it's a tree 947 * of empty dnodes. 948 */ 949 950 void hpfs_remove_dtree(struct super_block *s, dnode_secno dno) 951 { 952 struct quad_buffer_head qbh; 953 struct dnode *dnode; 954 struct hpfs_dirent *de; 955 dnode_secno d1, d2, rdno = dno; 956 while (1) { 957 if (!(dnode = hpfs_map_dnode(s, dno, &qbh))) return; 958 de = dnode_first_de(dnode); 959 if (de->last) { 960 if (de->down) d1 = de_down_pointer(de); 961 else goto error; 962 hpfs_brelse4(&qbh); 963 hpfs_free_dnode(s, dno); 964 dno = d1; 965 } else break; 966 } 967 if (!de->first) goto error; 968 d1 = de->down ? de_down_pointer(de) : 0; 969 de = de_next_de(de); 970 if (!de->last) goto error; 971 d2 = de->down ? de_down_pointer(de) : 0; 972 hpfs_brelse4(&qbh); 973 hpfs_free_dnode(s, dno); 974 do { 975 while (d1) { 976 if (!(dnode = hpfs_map_dnode(s, dno = d1, &qbh))) return; 977 de = dnode_first_de(dnode); 978 if (!de->last) goto error; 979 d1 = de->down ? de_down_pointer(de) : 0; 980 hpfs_brelse4(&qbh); 981 hpfs_free_dnode(s, dno); 982 } 983 d1 = d2; 984 d2 = 0; 985 } while (d1); 986 return; 987 error: 988 hpfs_brelse4(&qbh); 989 hpfs_free_dnode(s, dno); 990 hpfs_error(s, "directory %08x is corrupted or not empty", rdno); 991 } 992 993 /* 994 * Find dirent for specified fnode. Use truncated 15-char name in fnode as 995 * a help for searching. 996 */ 997 998 struct hpfs_dirent *map_fnode_dirent(struct super_block *s, fnode_secno fno, 999 struct fnode *f, struct quad_buffer_head *qbh) 1000 { 1001 unsigned char *name1; 1002 unsigned char *name2; 1003 int name1len, name2len; 1004 struct dnode *d; 1005 dnode_secno dno, downd; 1006 struct fnode *upf; 1007 struct buffer_head *bh; 1008 struct hpfs_dirent *de, *de_end; 1009 int c; 1010 int c1, c2 = 0; 1011 int d1, d2 = 0; 1012 name1 = f->name; 1013 if (!(name2 = kmalloc(256, GFP_NOFS))) { 1014 pr_err("out of memory, can't map dirent\n"); 1015 return NULL; 1016 } 1017 if (f->len <= 15) 1018 memcpy(name2, name1, name1len = name2len = f->len); 1019 else { 1020 memcpy(name2, name1, 15); 1021 memset(name2 + 15, 0xff, 256 - 15); 1022 /*name2[15] = 0xff;*/ 1023 name1len = 15; name2len = 256; 1024 } 1025 if (!(upf = hpfs_map_fnode(s, le32_to_cpu(f->up), &bh))) { 1026 kfree(name2); 1027 return NULL; 1028 } 1029 if (!fnode_is_dir(upf)) { 1030 brelse(bh); 1031 hpfs_error(s, "fnode %08x has non-directory parent %08x", fno, le32_to_cpu(f->up)); 1032 kfree(name2); 1033 return NULL; 1034 } 1035 dno = le32_to_cpu(upf->u.external[0].disk_secno); 1036 brelse(bh); 1037 go_down: 1038 downd = 0; 1039 go_up: 1040 if (!(d = hpfs_map_dnode(s, dno, qbh))) { 1041 kfree(name2); 1042 return NULL; 1043 } 1044 de_end = dnode_end_de(d); 1045 de = dnode_first_de(d); 1046 if (downd) { 1047 while (de < de_end) { 1048 if (de->down) if (de_down_pointer(de) == downd) goto f; 1049 de = de_next_de(de); 1050 } 1051 hpfs_error(s, "pointer to dnode %08x not found in dnode %08x", downd, dno); 1052 hpfs_brelse4(qbh); 1053 kfree(name2); 1054 return NULL; 1055 } 1056 next_de: 1057 if (le32_to_cpu(de->fnode) == fno) { 1058 kfree(name2); 1059 return de; 1060 } 1061 c = hpfs_compare_names(s, name1, name1len, de->name, de->namelen, de->last); 1062 if (c < 0 && de->down) { 1063 dno = de_down_pointer(de); 1064 hpfs_brelse4(qbh); 1065 if (hpfs_sb(s)->sb_chk) 1066 if (hpfs_stop_cycles(s, dno, &c1, &c2, "map_fnode_dirent #1")) { 1067 kfree(name2); 1068 return NULL; 1069 } 1070 goto go_down; 1071 } 1072 f: 1073 if (le32_to_cpu(de->fnode) == fno) { 1074 kfree(name2); 1075 return de; 1076 } 1077 c = hpfs_compare_names(s, name2, name2len, de->name, de->namelen, de->last); 1078 if (c < 0 && !de->last) goto not_found; 1079 if ((de = de_next_de(de)) < de_end) goto next_de; 1080 if (d->root_dnode) goto not_found; 1081 downd = dno; 1082 dno = le32_to_cpu(d->up); 1083 hpfs_brelse4(qbh); 1084 if (hpfs_sb(s)->sb_chk) 1085 if (hpfs_stop_cycles(s, downd, &d1, &d2, "map_fnode_dirent #2")) { 1086 kfree(name2); 1087 return NULL; 1088 } 1089 goto go_up; 1090 not_found: 1091 hpfs_brelse4(qbh); 1092 hpfs_error(s, "dirent for fnode %08x not found", fno); 1093 kfree(name2); 1094 return NULL; 1095 } 1096