1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/hpfs/anode.c 4 * 5 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 6 * 7 * handling HPFS anode tree that contains file allocation info 8 */ 9 10 #include "hpfs_fn.h" 11 12 /* Find a sector in allocation tree */ 13 14 secno hpfs_bplus_lookup(struct super_block *s, struct inode *inode, 15 struct bplus_header *btree, unsigned sec, 16 struct buffer_head *bh) 17 { 18 anode_secno a = -1; 19 struct anode *anode; 20 int i; 21 int c1, c2 = 0; 22 go_down: 23 if (hpfs_sb(s)->sb_chk) if (hpfs_stop_cycles(s, a, &c1, &c2, "hpfs_bplus_lookup")) return -1; 24 if (bp_internal(btree)) { 25 for (i = 0; i < btree->n_used_nodes; i++) 26 if (le32_to_cpu(btree->u.internal[i].file_secno) > sec) { 27 a = le32_to_cpu(btree->u.internal[i].down); 28 brelse(bh); 29 if (!(anode = hpfs_map_anode(s, a, &bh))) return -1; 30 btree = &anode->btree; 31 goto go_down; 32 } 33 hpfs_error(s, "sector %08x not found in internal anode %08x", sec, a); 34 brelse(bh); 35 return -1; 36 } 37 for (i = 0; i < btree->n_used_nodes; i++) 38 if (le32_to_cpu(btree->u.external[i].file_secno) <= sec && 39 le32_to_cpu(btree->u.external[i].file_secno) + le32_to_cpu(btree->u.external[i].length) > sec) { 40 a = le32_to_cpu(btree->u.external[i].disk_secno) + sec - le32_to_cpu(btree->u.external[i].file_secno); 41 if (hpfs_sb(s)->sb_chk) if (hpfs_chk_sectors(s, a, 1, "data")) { 42 brelse(bh); 43 return -1; 44 } 45 if (inode) { 46 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); 47 hpfs_inode->i_file_sec = le32_to_cpu(btree->u.external[i].file_secno); 48 hpfs_inode->i_disk_sec = le32_to_cpu(btree->u.external[i].disk_secno); 49 hpfs_inode->i_n_secs = le32_to_cpu(btree->u.external[i].length); 50 } 51 brelse(bh); 52 return a; 53 } 54 hpfs_error(s, "sector %08x not found in external anode %08x", sec, a); 55 brelse(bh); 56 return -1; 57 } 58 59 /* Add a sector to tree */ 60 61 secno hpfs_add_sector_to_btree(struct super_block *s, secno node, int fnod, unsigned fsecno) 62 { 63 struct bplus_header *btree; 64 struct anode *anode = NULL, *ranode = NULL; 65 struct fnode *fnode; 66 anode_secno a, na = -1, ra, up = -1; 67 secno se; 68 struct buffer_head *bh, *bh1, *bh2; 69 int n; 70 unsigned fs; 71 int c1, c2 = 0; 72 if (fnod) { 73 if (!(fnode = hpfs_map_fnode(s, node, &bh))) return -1; 74 btree = &fnode->btree; 75 } else { 76 if (!(anode = hpfs_map_anode(s, node, &bh))) return -1; 77 btree = &anode->btree; 78 } 79 a = node; 80 go_down: 81 if ((n = btree->n_used_nodes - 1) < -!!fnod) { 82 hpfs_error(s, "anode %08x has no entries", a); 83 brelse(bh); 84 return -1; 85 } 86 if (bp_internal(btree)) { 87 a = le32_to_cpu(btree->u.internal[n].down); 88 btree->u.internal[n].file_secno = cpu_to_le32(-1); 89 mark_buffer_dirty(bh); 90 brelse(bh); 91 if (hpfs_sb(s)->sb_chk) 92 if (hpfs_stop_cycles(s, a, &c1, &c2, "hpfs_add_sector_to_btree #1")) return -1; 93 if (!(anode = hpfs_map_anode(s, a, &bh))) return -1; 94 btree = &anode->btree; 95 goto go_down; 96 } 97 if (n >= 0) { 98 if (le32_to_cpu(btree->u.external[n].file_secno) + le32_to_cpu(btree->u.external[n].length) != fsecno) { 99 hpfs_error(s, "allocated size %08x, trying to add sector %08x, %cnode %08x", 100 le32_to_cpu(btree->u.external[n].file_secno) + le32_to_cpu(btree->u.external[n].length), fsecno, 101 fnod?'f':'a', node); 102 brelse(bh); 103 return -1; 104 } 105 if (hpfs_alloc_if_possible(s, se = le32_to_cpu(btree->u.external[n].disk_secno) + le32_to_cpu(btree->u.external[n].length))) { 106 le32_add_cpu(&btree->u.external[n].length, 1); 107 mark_buffer_dirty(bh); 108 brelse(bh); 109 return se; 110 } 111 } else { 112 if (fsecno) { 113 hpfs_error(s, "empty file %08x, trying to add sector %08x", node, fsecno); 114 brelse(bh); 115 return -1; 116 } 117 se = !fnod ? node : (node + 16384) & ~16383; 118 } 119 if (!(se = hpfs_alloc_sector(s, se, 1, fsecno*ALLOC_M>ALLOC_FWD_MAX ? ALLOC_FWD_MAX : fsecno*ALLOC_M<ALLOC_FWD_MIN ? ALLOC_FWD_MIN : fsecno*ALLOC_M))) { 120 brelse(bh); 121 return -1; 122 } 123 fs = n < 0 ? 0 : le32_to_cpu(btree->u.external[n].file_secno) + le32_to_cpu(btree->u.external[n].length); 124 if (!btree->n_free_nodes) { 125 up = a != node ? le32_to_cpu(anode->up) : -1; 126 if (!(anode = hpfs_alloc_anode(s, a, &na, &bh1))) { 127 brelse(bh); 128 hpfs_free_sectors(s, se, 1); 129 return -1; 130 } 131 if (a == node && fnod) { 132 anode->up = cpu_to_le32(node); 133 anode->btree.flags |= BP_fnode_parent; 134 anode->btree.n_used_nodes = btree->n_used_nodes; 135 anode->btree.first_free = btree->first_free; 136 anode->btree.n_free_nodes = 40 - anode->btree.n_used_nodes; 137 memcpy(&anode->u, &btree->u, btree->n_used_nodes * 12); 138 btree->flags |= BP_internal; 139 btree->n_free_nodes = 11; 140 btree->n_used_nodes = 1; 141 btree->first_free = cpu_to_le16((char *)&(btree->u.internal[1]) - (char *)btree); 142 btree->u.internal[0].file_secno = cpu_to_le32(-1); 143 btree->u.internal[0].down = cpu_to_le32(na); 144 mark_buffer_dirty(bh); 145 } else if (!(ranode = hpfs_alloc_anode(s, /*a*/0, &ra, &bh2))) { 146 brelse(bh); 147 brelse(bh1); 148 hpfs_free_sectors(s, se, 1); 149 hpfs_free_sectors(s, na, 1); 150 return -1; 151 } 152 brelse(bh); 153 bh = bh1; 154 btree = &anode->btree; 155 } 156 btree->n_free_nodes--; n = btree->n_used_nodes++; 157 le16_add_cpu(&btree->first_free, 12); 158 btree->u.external[n].disk_secno = cpu_to_le32(se); 159 btree->u.external[n].file_secno = cpu_to_le32(fs); 160 btree->u.external[n].length = cpu_to_le32(1); 161 mark_buffer_dirty(bh); 162 brelse(bh); 163 if ((a == node && fnod) || na == -1) return se; 164 c2 = 0; 165 while (up != (anode_secno)-1) { 166 struct anode *new_anode; 167 if (hpfs_sb(s)->sb_chk) 168 if (hpfs_stop_cycles(s, up, &c1, &c2, "hpfs_add_sector_to_btree #2")) return -1; 169 if (up != node || !fnod) { 170 if (!(anode = hpfs_map_anode(s, up, &bh))) return -1; 171 btree = &anode->btree; 172 } else { 173 if (!(fnode = hpfs_map_fnode(s, up, &bh))) return -1; 174 btree = &fnode->btree; 175 } 176 if (btree->n_free_nodes) { 177 btree->n_free_nodes--; n = btree->n_used_nodes++; 178 le16_add_cpu(&btree->first_free, 8); 179 btree->u.internal[n].file_secno = cpu_to_le32(-1); 180 btree->u.internal[n].down = cpu_to_le32(na); 181 btree->u.internal[n-1].file_secno = cpu_to_le32(fs); 182 mark_buffer_dirty(bh); 183 brelse(bh); 184 brelse(bh2); 185 hpfs_free_sectors(s, ra, 1); 186 if ((anode = hpfs_map_anode(s, na, &bh))) { 187 anode->up = cpu_to_le32(up); 188 if (up == node && fnod) 189 anode->btree.flags |= BP_fnode_parent; 190 else 191 anode->btree.flags &= ~BP_fnode_parent; 192 mark_buffer_dirty(bh); 193 brelse(bh); 194 } 195 return se; 196 } 197 up = up != node ? le32_to_cpu(anode->up) : -1; 198 btree->u.internal[btree->n_used_nodes - 1].file_secno = cpu_to_le32(/*fs*/-1); 199 mark_buffer_dirty(bh); 200 brelse(bh); 201 a = na; 202 if ((new_anode = hpfs_alloc_anode(s, a, &na, &bh))) { 203 anode = new_anode; 204 /*anode->up = cpu_to_le32(up != -1 ? up : ra);*/ 205 anode->btree.flags |= BP_internal; 206 anode->btree.n_used_nodes = 1; 207 anode->btree.n_free_nodes = 59; 208 anode->btree.first_free = cpu_to_le16(16); 209 anode->btree.u.internal[0].down = cpu_to_le32(a); 210 anode->btree.u.internal[0].file_secno = cpu_to_le32(-1); 211 mark_buffer_dirty(bh); 212 brelse(bh); 213 if ((anode = hpfs_map_anode(s, a, &bh))) { 214 anode->up = cpu_to_le32(na); 215 mark_buffer_dirty(bh); 216 brelse(bh); 217 } 218 } else na = a; 219 } 220 if ((anode = hpfs_map_anode(s, na, &bh))) { 221 anode->up = cpu_to_le32(node); 222 if (fnod) 223 anode->btree.flags |= BP_fnode_parent; 224 mark_buffer_dirty(bh); 225 brelse(bh); 226 } 227 if (!fnod) { 228 if (!(anode = hpfs_map_anode(s, node, &bh))) { 229 brelse(bh2); 230 return -1; 231 } 232 btree = &anode->btree; 233 } else { 234 if (!(fnode = hpfs_map_fnode(s, node, &bh))) { 235 brelse(bh2); 236 return -1; 237 } 238 btree = &fnode->btree; 239 } 240 ranode->up = cpu_to_le32(node); 241 memcpy(&ranode->btree, btree, le16_to_cpu(btree->first_free)); 242 if (fnod) 243 ranode->btree.flags |= BP_fnode_parent; 244 ranode->btree.n_free_nodes = (bp_internal(&ranode->btree) ? 60 : 40) - ranode->btree.n_used_nodes; 245 if (bp_internal(&ranode->btree)) for (n = 0; n < ranode->btree.n_used_nodes; n++) { 246 struct anode *unode; 247 if ((unode = hpfs_map_anode(s, le32_to_cpu(ranode->u.internal[n].down), &bh1))) { 248 unode->up = cpu_to_le32(ra); 249 unode->btree.flags &= ~BP_fnode_parent; 250 mark_buffer_dirty(bh1); 251 brelse(bh1); 252 } 253 } 254 btree->flags |= BP_internal; 255 btree->n_free_nodes = fnod ? 10 : 58; 256 btree->n_used_nodes = 2; 257 btree->first_free = cpu_to_le16((char *)&btree->u.internal[2] - (char *)btree); 258 btree->u.internal[0].file_secno = cpu_to_le32(fs); 259 btree->u.internal[0].down = cpu_to_le32(ra); 260 btree->u.internal[1].file_secno = cpu_to_le32(-1); 261 btree->u.internal[1].down = cpu_to_le32(na); 262 mark_buffer_dirty(bh); 263 brelse(bh); 264 mark_buffer_dirty(bh2); 265 brelse(bh2); 266 return se; 267 } 268 269 /* 270 * Remove allocation tree. Recursion would look much nicer but 271 * I want to avoid it because it can cause stack overflow. 272 */ 273 274 void hpfs_remove_btree(struct super_block *s, struct bplus_header *btree) 275 { 276 struct bplus_header *btree1 = btree; 277 struct anode *anode = NULL; 278 anode_secno ano = 0, oano; 279 struct buffer_head *bh; 280 int level = 0; 281 int pos = 0; 282 int i; 283 int c1, c2 = 0; 284 int d1, d2; 285 go_down: 286 d2 = 0; 287 while (bp_internal(btree1)) { 288 ano = le32_to_cpu(btree1->u.internal[pos].down); 289 if (level) brelse(bh); 290 if (hpfs_sb(s)->sb_chk) 291 if (hpfs_stop_cycles(s, ano, &d1, &d2, "hpfs_remove_btree #1")) 292 return; 293 if (!(anode = hpfs_map_anode(s, ano, &bh))) return; 294 btree1 = &anode->btree; 295 level++; 296 pos = 0; 297 } 298 for (i = 0; i < btree1->n_used_nodes; i++) 299 hpfs_free_sectors(s, le32_to_cpu(btree1->u.external[i].disk_secno), le32_to_cpu(btree1->u.external[i].length)); 300 go_up: 301 if (!level) return; 302 brelse(bh); 303 if (hpfs_sb(s)->sb_chk) 304 if (hpfs_stop_cycles(s, ano, &c1, &c2, "hpfs_remove_btree #2")) return; 305 hpfs_free_sectors(s, ano, 1); 306 oano = ano; 307 ano = le32_to_cpu(anode->up); 308 if (--level) { 309 if (!(anode = hpfs_map_anode(s, ano, &bh))) return; 310 btree1 = &anode->btree; 311 } else btree1 = btree; 312 for (i = 0; i < btree1->n_used_nodes; i++) { 313 if (le32_to_cpu(btree1->u.internal[i].down) == oano) { 314 if ((pos = i + 1) < btree1->n_used_nodes) 315 goto go_down; 316 else 317 goto go_up; 318 } 319 } 320 hpfs_error(s, 321 "reference to anode %08x not found in anode %08x " 322 "(probably bad up pointer)", 323 oano, level ? ano : -1); 324 if (level) 325 brelse(bh); 326 } 327 328 /* Just a wrapper around hpfs_bplus_lookup .. used for reading eas */ 329 330 static secno anode_lookup(struct super_block *s, anode_secno a, unsigned sec) 331 { 332 struct anode *anode; 333 struct buffer_head *bh; 334 if (!(anode = hpfs_map_anode(s, a, &bh))) return -1; 335 return hpfs_bplus_lookup(s, NULL, &anode->btree, sec, bh); 336 } 337 338 int hpfs_ea_read(struct super_block *s, secno a, int ano, unsigned pos, 339 unsigned len, char *buf) 340 { 341 struct buffer_head *bh; 342 char *data; 343 secno sec; 344 unsigned l; 345 while (len) { 346 if (ano) { 347 if ((sec = anode_lookup(s, a, pos >> 9)) == -1) 348 return -1; 349 } else sec = a + (pos >> 9); 350 if (hpfs_sb(s)->sb_chk) if (hpfs_chk_sectors(s, sec, 1, "ea #1")) return -1; 351 if (!(data = hpfs_map_sector(s, sec, &bh, (len - 1) >> 9))) 352 return -1; 353 l = 0x200 - (pos & 0x1ff); if (l > len) l = len; 354 memcpy(buf, data + (pos & 0x1ff), l); 355 brelse(bh); 356 buf += l; pos += l; len -= l; 357 } 358 return 0; 359 } 360 361 int hpfs_ea_write(struct super_block *s, secno a, int ano, unsigned pos, 362 unsigned len, const char *buf) 363 { 364 struct buffer_head *bh; 365 char *data; 366 secno sec; 367 unsigned l; 368 while (len) { 369 if (ano) { 370 if ((sec = anode_lookup(s, a, pos >> 9)) == -1) 371 return -1; 372 } else sec = a + (pos >> 9); 373 if (hpfs_sb(s)->sb_chk) if (hpfs_chk_sectors(s, sec, 1, "ea #2")) return -1; 374 if (!(data = hpfs_map_sector(s, sec, &bh, (len - 1) >> 9))) 375 return -1; 376 l = 0x200 - (pos & 0x1ff); if (l > len) l = len; 377 memcpy(data + (pos & 0x1ff), buf, l); 378 mark_buffer_dirty(bh); 379 brelse(bh); 380 buf += l; pos += l; len -= l; 381 } 382 return 0; 383 } 384 385 void hpfs_ea_remove(struct super_block *s, secno a, int ano, unsigned len) 386 { 387 struct anode *anode; 388 struct buffer_head *bh; 389 if (ano) { 390 if (!(anode = hpfs_map_anode(s, a, &bh))) return; 391 hpfs_remove_btree(s, &anode->btree); 392 brelse(bh); 393 hpfs_free_sectors(s, a, 1); 394 } else hpfs_free_sectors(s, a, (len + 511) >> 9); 395 } 396 397 /* Truncate allocation tree. Doesn't join anodes - I hope it doesn't matter */ 398 399 void hpfs_truncate_btree(struct super_block *s, secno f, int fno, unsigned secs) 400 { 401 struct fnode *fnode; 402 struct anode *anode; 403 struct buffer_head *bh; 404 struct bplus_header *btree; 405 anode_secno node = f; 406 int i, j, nodes; 407 int c1, c2 = 0; 408 if (fno) { 409 if (!(fnode = hpfs_map_fnode(s, f, &bh))) return; 410 btree = &fnode->btree; 411 } else { 412 if (!(anode = hpfs_map_anode(s, f, &bh))) return; 413 btree = &anode->btree; 414 } 415 if (!secs) { 416 hpfs_remove_btree(s, btree); 417 if (fno) { 418 btree->n_free_nodes = 8; 419 btree->n_used_nodes = 0; 420 btree->first_free = cpu_to_le16(8); 421 btree->flags &= ~BP_internal; 422 mark_buffer_dirty(bh); 423 } else hpfs_free_sectors(s, f, 1); 424 brelse(bh); 425 return; 426 } 427 while (bp_internal(btree)) { 428 nodes = btree->n_used_nodes + btree->n_free_nodes; 429 for (i = 0; i < btree->n_used_nodes; i++) 430 if (le32_to_cpu(btree->u.internal[i].file_secno) >= secs) goto f; 431 brelse(bh); 432 hpfs_error(s, "internal btree %08x doesn't end with -1", node); 433 return; 434 f: 435 for (j = i + 1; j < btree->n_used_nodes; j++) 436 hpfs_ea_remove(s, le32_to_cpu(btree->u.internal[j].down), 1, 0); 437 btree->n_used_nodes = i + 1; 438 btree->n_free_nodes = nodes - btree->n_used_nodes; 439 btree->first_free = cpu_to_le16(8 + 8 * btree->n_used_nodes); 440 mark_buffer_dirty(bh); 441 if (btree->u.internal[i].file_secno == cpu_to_le32(secs)) { 442 brelse(bh); 443 return; 444 } 445 node = le32_to_cpu(btree->u.internal[i].down); 446 brelse(bh); 447 if (hpfs_sb(s)->sb_chk) 448 if (hpfs_stop_cycles(s, node, &c1, &c2, "hpfs_truncate_btree")) 449 return; 450 if (!(anode = hpfs_map_anode(s, node, &bh))) return; 451 btree = &anode->btree; 452 } 453 nodes = btree->n_used_nodes + btree->n_free_nodes; 454 for (i = 0; i < btree->n_used_nodes; i++) 455 if (le32_to_cpu(btree->u.external[i].file_secno) + le32_to_cpu(btree->u.external[i].length) >= secs) goto ff; 456 brelse(bh); 457 return; 458 ff: 459 if (secs <= le32_to_cpu(btree->u.external[i].file_secno)) { 460 hpfs_error(s, "there is an allocation error in file %08x, sector %08x", f, secs); 461 if (i) i--; 462 } 463 else if (le32_to_cpu(btree->u.external[i].file_secno) + le32_to_cpu(btree->u.external[i].length) > secs) { 464 hpfs_free_sectors(s, le32_to_cpu(btree->u.external[i].disk_secno) + secs - 465 le32_to_cpu(btree->u.external[i].file_secno), le32_to_cpu(btree->u.external[i].length) 466 - secs + le32_to_cpu(btree->u.external[i].file_secno)); /* I hope gcc optimizes this :-) */ 467 btree->u.external[i].length = cpu_to_le32(secs - le32_to_cpu(btree->u.external[i].file_secno)); 468 } 469 for (j = i + 1; j < btree->n_used_nodes; j++) 470 hpfs_free_sectors(s, le32_to_cpu(btree->u.external[j].disk_secno), le32_to_cpu(btree->u.external[j].length)); 471 btree->n_used_nodes = i + 1; 472 btree->n_free_nodes = nodes - btree->n_used_nodes; 473 btree->first_free = cpu_to_le16(8 + 12 * btree->n_used_nodes); 474 mark_buffer_dirty(bh); 475 brelse(bh); 476 } 477 478 /* Remove file or directory and it's eas - note that directory must 479 be empty when this is called. */ 480 481 void hpfs_remove_fnode(struct super_block *s, fnode_secno fno) 482 { 483 struct buffer_head *bh; 484 struct fnode *fnode; 485 struct extended_attribute *ea; 486 struct extended_attribute *ea_end; 487 if (!(fnode = hpfs_map_fnode(s, fno, &bh))) return; 488 if (!fnode_is_dir(fnode)) hpfs_remove_btree(s, &fnode->btree); 489 else hpfs_remove_dtree(s, le32_to_cpu(fnode->u.external[0].disk_secno)); 490 ea_end = fnode_end_ea(fnode); 491 for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea)) 492 if (ea_indirect(ea)) 493 hpfs_ea_remove(s, ea_sec(ea), ea_in_anode(ea), ea_len(ea)); 494 hpfs_ea_ext_remove(s, le32_to_cpu(fnode->ea_secno), fnode_in_anode(fnode), le32_to_cpu(fnode->ea_size_l)); 495 brelse(bh); 496 hpfs_free_sectors(s, fno, 1); 497 } 498