1 /* 2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README 3 */ 4 5 /* 6 * Now we have all buffers that must be used in balancing of the tree 7 * Further calculations can not cause schedule(), and thus the buffer 8 * tree will be stable until the balancing will be finished 9 * balance the tree according to the analysis made before, 10 * and using buffers obtained after all above. 11 */ 12 13 #include <linux/uaccess.h> 14 #include <linux/time.h> 15 #include "reiserfs.h" 16 #include <linux/buffer_head.h> 17 #include <linux/kernel.h> 18 19 static inline void buffer_info_init_left(struct tree_balance *tb, 20 struct buffer_info *bi) 21 { 22 bi->tb = tb; 23 bi->bi_bh = tb->L[0]; 24 bi->bi_parent = tb->FL[0]; 25 bi->bi_position = get_left_neighbor_position(tb, 0); 26 } 27 28 static inline void buffer_info_init_right(struct tree_balance *tb, 29 struct buffer_info *bi) 30 { 31 bi->tb = tb; 32 bi->bi_bh = tb->R[0]; 33 bi->bi_parent = tb->FR[0]; 34 bi->bi_position = get_right_neighbor_position(tb, 0); 35 } 36 37 static inline void buffer_info_init_tbS0(struct tree_balance *tb, 38 struct buffer_info *bi) 39 { 40 bi->tb = tb; 41 bi->bi_bh = PATH_PLAST_BUFFER(tb->tb_path); 42 bi->bi_parent = PATH_H_PPARENT(tb->tb_path, 0); 43 bi->bi_position = PATH_H_POSITION(tb->tb_path, 1); 44 } 45 46 static inline void buffer_info_init_bh(struct tree_balance *tb, 47 struct buffer_info *bi, 48 struct buffer_head *bh) 49 { 50 bi->tb = tb; 51 bi->bi_bh = bh; 52 bi->bi_parent = NULL; 53 bi->bi_position = 0; 54 } 55 56 inline void do_balance_mark_leaf_dirty(struct tree_balance *tb, 57 struct buffer_head *bh, int flag) 58 { 59 journal_mark_dirty(tb->transaction_handle, bh); 60 } 61 62 #define do_balance_mark_internal_dirty do_balance_mark_leaf_dirty 63 #define do_balance_mark_sb_dirty do_balance_mark_leaf_dirty 64 65 /* 66 * summary: 67 * if deleting something ( tb->insert_size[0] < 0 ) 68 * return(balance_leaf_when_delete()); (flag d handled here) 69 * else 70 * if lnum is larger than 0 we put items into the left node 71 * if rnum is larger than 0 we put items into the right node 72 * if snum1 is larger than 0 we put items into the new node s1 73 * if snum2 is larger than 0 we put items into the new node s2 74 * Note that all *num* count new items being created. 75 */ 76 77 static void balance_leaf_when_delete_del(struct tree_balance *tb) 78 { 79 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); 80 int item_pos = PATH_LAST_POSITION(tb->tb_path); 81 struct buffer_info bi; 82 #ifdef CONFIG_REISERFS_CHECK 83 struct item_head *ih = item_head(tbS0, item_pos); 84 #endif 85 86 RFALSE(ih_item_len(ih) + IH_SIZE != -tb->insert_size[0], 87 "vs-12013: mode Delete, insert size %d, ih to be deleted %h", 88 -tb->insert_size[0], ih); 89 90 buffer_info_init_tbS0(tb, &bi); 91 leaf_delete_items(&bi, 0, item_pos, 1, -1); 92 93 if (!item_pos && tb->CFL[0]) { 94 if (B_NR_ITEMS(tbS0)) { 95 replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0, 0); 96 } else { 97 if (!PATH_H_POSITION(tb->tb_path, 1)) 98 replace_key(tb, tb->CFL[0], tb->lkey[0], 99 PATH_H_PPARENT(tb->tb_path, 0), 0); 100 } 101 } 102 103 RFALSE(!item_pos && !tb->CFL[0], 104 "PAP-12020: tb->CFL[0]==%p, tb->L[0]==%p", tb->CFL[0], 105 tb->L[0]); 106 } 107 108 /* cut item in S[0] */ 109 static void balance_leaf_when_delete_cut(struct tree_balance *tb) 110 { 111 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); 112 int item_pos = PATH_LAST_POSITION(tb->tb_path); 113 struct item_head *ih = item_head(tbS0, item_pos); 114 int pos_in_item = tb->tb_path->pos_in_item; 115 struct buffer_info bi; 116 buffer_info_init_tbS0(tb, &bi); 117 118 if (is_direntry_le_ih(ih)) { 119 /* 120 * UFS unlink semantics are such that you can only 121 * delete one directory entry at a time. 122 * 123 * when we cut a directory tb->insert_size[0] means 124 * number of entries to be cut (always 1) 125 */ 126 tb->insert_size[0] = -1; 127 leaf_cut_from_buffer(&bi, item_pos, pos_in_item, 128 -tb->insert_size[0]); 129 130 RFALSE(!item_pos && !pos_in_item && !tb->CFL[0], 131 "PAP-12030: can not change delimiting key. CFL[0]=%p", 132 tb->CFL[0]); 133 134 if (!item_pos && !pos_in_item && tb->CFL[0]) 135 replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0, 0); 136 } else { 137 leaf_cut_from_buffer(&bi, item_pos, pos_in_item, 138 -tb->insert_size[0]); 139 140 RFALSE(!ih_item_len(ih), 141 "PAP-12035: cut must leave non-zero dynamic " 142 "length of item"); 143 } 144 } 145 146 static int balance_leaf_when_delete_left(struct tree_balance *tb) 147 { 148 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); 149 int n = B_NR_ITEMS(tbS0); 150 151 /* L[0] must be joined with S[0] */ 152 if (tb->lnum[0] == -1) { 153 /* R[0] must be also joined with S[0] */ 154 if (tb->rnum[0] == -1) { 155 if (tb->FR[0] == PATH_H_PPARENT(tb->tb_path, 0)) { 156 /* 157 * all contents of all the 158 * 3 buffers will be in L[0] 159 */ 160 if (PATH_H_POSITION(tb->tb_path, 1) == 0 && 161 1 < B_NR_ITEMS(tb->FR[0])) 162 replace_key(tb, tb->CFL[0], 163 tb->lkey[0], tb->FR[0], 1); 164 165 leaf_move_items(LEAF_FROM_S_TO_L, tb, n, -1, 166 NULL); 167 leaf_move_items(LEAF_FROM_R_TO_L, tb, 168 B_NR_ITEMS(tb->R[0]), -1, 169 NULL); 170 171 reiserfs_invalidate_buffer(tb, tbS0); 172 reiserfs_invalidate_buffer(tb, tb->R[0]); 173 174 return 0; 175 } 176 177 /* all contents of all the 3 buffers will be in R[0] */ 178 leaf_move_items(LEAF_FROM_S_TO_R, tb, n, -1, NULL); 179 leaf_move_items(LEAF_FROM_L_TO_R, tb, 180 B_NR_ITEMS(tb->L[0]), -1, NULL); 181 182 /* right_delimiting_key is correct in R[0] */ 183 replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0); 184 185 reiserfs_invalidate_buffer(tb, tbS0); 186 reiserfs_invalidate_buffer(tb, tb->L[0]); 187 188 return -1; 189 } 190 191 RFALSE(tb->rnum[0] != 0, 192 "PAP-12045: rnum must be 0 (%d)", tb->rnum[0]); 193 /* all contents of L[0] and S[0] will be in L[0] */ 194 leaf_shift_left(tb, n, -1); 195 196 reiserfs_invalidate_buffer(tb, tbS0); 197 198 return 0; 199 } 200 201 /* 202 * a part of contents of S[0] will be in L[0] and 203 * the rest part of S[0] will be in R[0] 204 */ 205 206 RFALSE((tb->lnum[0] + tb->rnum[0] < n) || 207 (tb->lnum[0] + tb->rnum[0] > n + 1), 208 "PAP-12050: rnum(%d) and lnum(%d) and item " 209 "number(%d) in S[0] are not consistent", 210 tb->rnum[0], tb->lnum[0], n); 211 RFALSE((tb->lnum[0] + tb->rnum[0] == n) && 212 (tb->lbytes != -1 || tb->rbytes != -1), 213 "PAP-12055: bad rbytes (%d)/lbytes (%d) " 214 "parameters when items are not split", 215 tb->rbytes, tb->lbytes); 216 RFALSE((tb->lnum[0] + tb->rnum[0] == n + 1) && 217 (tb->lbytes < 1 || tb->rbytes != -1), 218 "PAP-12060: bad rbytes (%d)/lbytes (%d) " 219 "parameters when items are split", 220 tb->rbytes, tb->lbytes); 221 222 leaf_shift_left(tb, tb->lnum[0], tb->lbytes); 223 leaf_shift_right(tb, tb->rnum[0], tb->rbytes); 224 225 reiserfs_invalidate_buffer(tb, tbS0); 226 227 return 0; 228 } 229 230 /* 231 * Balance leaf node in case of delete or cut: insert_size[0] < 0 232 * 233 * lnum, rnum can have values >= -1 234 * -1 means that the neighbor must be joined with S 235 * 0 means that nothing should be done with the neighbor 236 * >0 means to shift entirely or partly the specified number of items 237 * to the neighbor 238 */ 239 static int balance_leaf_when_delete(struct tree_balance *tb, int flag) 240 { 241 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); 242 struct buffer_info bi; 243 int n; 244 245 RFALSE(tb->FR[0] && B_LEVEL(tb->FR[0]) != DISK_LEAF_NODE_LEVEL + 1, 246 "vs- 12000: level: wrong FR %z", tb->FR[0]); 247 RFALSE(tb->blknum[0] > 1, 248 "PAP-12005: tb->blknum == %d, can not be > 1", tb->blknum[0]); 249 RFALSE(!tb->blknum[0] && !PATH_H_PPARENT(tb->tb_path, 0), 250 "PAP-12010: tree can not be empty"); 251 252 buffer_info_init_tbS0(tb, &bi); 253 254 /* Delete or truncate the item */ 255 256 BUG_ON(flag != M_DELETE && flag != M_CUT); 257 if (flag == M_DELETE) 258 balance_leaf_when_delete_del(tb); 259 else /* M_CUT */ 260 balance_leaf_when_delete_cut(tb); 261 262 263 /* 264 * the rule is that no shifting occurs unless by shifting 265 * a node can be freed 266 */ 267 n = B_NR_ITEMS(tbS0); 268 269 270 /* L[0] takes part in balancing */ 271 if (tb->lnum[0]) 272 return balance_leaf_when_delete_left(tb); 273 274 if (tb->rnum[0] == -1) { 275 /* all contents of R[0] and S[0] will be in R[0] */ 276 leaf_shift_right(tb, n, -1); 277 reiserfs_invalidate_buffer(tb, tbS0); 278 return 0; 279 } 280 281 RFALSE(tb->rnum[0], 282 "PAP-12065: bad rnum parameter must be 0 (%d)", tb->rnum[0]); 283 return 0; 284 } 285 286 static unsigned int balance_leaf_insert_left(struct tree_balance *tb, 287 struct item_head *const ih, 288 const char * const body) 289 { 290 int ret; 291 struct buffer_info bi; 292 int n = B_NR_ITEMS(tb->L[0]); 293 unsigned body_shift_bytes = 0; 294 295 if (tb->item_pos == tb->lnum[0] - 1 && tb->lbytes != -1) { 296 /* part of new item falls into L[0] */ 297 int new_item_len, shift; 298 299 ret = leaf_shift_left(tb, tb->lnum[0] - 1, -1); 300 301 /* Calculate item length to insert to S[0] */ 302 new_item_len = ih_item_len(ih) - tb->lbytes; 303 304 /* Calculate and check item length to insert to L[0] */ 305 put_ih_item_len(ih, ih_item_len(ih) - new_item_len); 306 307 RFALSE(ih_item_len(ih) <= 0, 308 "PAP-12080: there is nothing to insert into L[0]: " 309 "ih_item_len=%d", ih_item_len(ih)); 310 311 /* Insert new item into L[0] */ 312 buffer_info_init_left(tb, &bi); 313 leaf_insert_into_buf(&bi, n + tb->item_pos - ret, ih, body, 314 min_t(int, tb->zeroes_num, ih_item_len(ih))); 315 316 /* 317 * Calculate key component, item length and body to 318 * insert into S[0] 319 */ 320 shift = 0; 321 if (is_indirect_le_ih(ih)) 322 shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT; 323 324 add_le_ih_k_offset(ih, tb->lbytes << shift); 325 326 put_ih_item_len(ih, new_item_len); 327 if (tb->lbytes > tb->zeroes_num) { 328 body_shift_bytes = tb->lbytes - tb->zeroes_num; 329 tb->zeroes_num = 0; 330 } else 331 tb->zeroes_num -= tb->lbytes; 332 333 RFALSE(ih_item_len(ih) <= 0, 334 "PAP-12085: there is nothing to insert into S[0]: " 335 "ih_item_len=%d", ih_item_len(ih)); 336 } else { 337 /* new item in whole falls into L[0] */ 338 /* Shift lnum[0]-1 items to L[0] */ 339 ret = leaf_shift_left(tb, tb->lnum[0] - 1, tb->lbytes); 340 341 /* Insert new item into L[0] */ 342 buffer_info_init_left(tb, &bi); 343 leaf_insert_into_buf(&bi, n + tb->item_pos - ret, ih, body, 344 tb->zeroes_num); 345 tb->insert_size[0] = 0; 346 tb->zeroes_num = 0; 347 } 348 return body_shift_bytes; 349 } 350 351 static void balance_leaf_paste_left_shift_dirent(struct tree_balance *tb, 352 struct item_head * const ih, 353 const char * const body) 354 { 355 int n = B_NR_ITEMS(tb->L[0]); 356 struct buffer_info bi; 357 358 RFALSE(tb->zeroes_num, 359 "PAP-12090: invalid parameter in case of a directory"); 360 361 /* directory item */ 362 if (tb->lbytes > tb->pos_in_item) { 363 /* new directory entry falls into L[0] */ 364 struct item_head *pasted; 365 int ret, l_pos_in_item = tb->pos_in_item; 366 367 /* 368 * Shift lnum[0] - 1 items in whole. 369 * Shift lbytes - 1 entries from given directory item 370 */ 371 ret = leaf_shift_left(tb, tb->lnum[0], tb->lbytes - 1); 372 if (ret && !tb->item_pos) { 373 pasted = item_head(tb->L[0], B_NR_ITEMS(tb->L[0]) - 1); 374 l_pos_in_item += ih_entry_count(pasted) - 375 (tb->lbytes - 1); 376 } 377 378 /* Append given directory entry to directory item */ 379 buffer_info_init_left(tb, &bi); 380 leaf_paste_in_buffer(&bi, n + tb->item_pos - ret, 381 l_pos_in_item, tb->insert_size[0], 382 body, tb->zeroes_num); 383 384 /* 385 * previous string prepared space for pasting new entry, 386 * following string pastes this entry 387 */ 388 389 /* 390 * when we have merge directory item, pos_in_item 391 * has been changed too 392 */ 393 394 /* paste new directory entry. 1 is entry number */ 395 leaf_paste_entries(&bi, n + tb->item_pos - ret, 396 l_pos_in_item, 1, 397 (struct reiserfs_de_head *) body, 398 body + DEH_SIZE, tb->insert_size[0]); 399 tb->insert_size[0] = 0; 400 } else { 401 /* new directory item doesn't fall into L[0] */ 402 /* 403 * Shift lnum[0]-1 items in whole. Shift lbytes 404 * directory entries from directory item number lnum[0] 405 */ 406 leaf_shift_left(tb, tb->lnum[0], tb->lbytes); 407 } 408 409 /* Calculate new position to append in item body */ 410 tb->pos_in_item -= tb->lbytes; 411 } 412 413 static unsigned int balance_leaf_paste_left_shift(struct tree_balance *tb, 414 struct item_head * const ih, 415 const char * const body) 416 { 417 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); 418 int n = B_NR_ITEMS(tb->L[0]); 419 struct buffer_info bi; 420 int body_shift_bytes = 0; 421 422 if (is_direntry_le_ih(item_head(tbS0, tb->item_pos))) { 423 balance_leaf_paste_left_shift_dirent(tb, ih, body); 424 return 0; 425 } 426 427 RFALSE(tb->lbytes <= 0, 428 "PAP-12095: there is nothing to shift to L[0]. " 429 "lbytes=%d", tb->lbytes); 430 RFALSE(tb->pos_in_item != ih_item_len(item_head(tbS0, tb->item_pos)), 431 "PAP-12100: incorrect position to paste: " 432 "item_len=%d, pos_in_item=%d", 433 ih_item_len(item_head(tbS0, tb->item_pos)), tb->pos_in_item); 434 435 /* appended item will be in L[0] in whole */ 436 if (tb->lbytes >= tb->pos_in_item) { 437 struct item_head *tbS0_pos_ih, *tbL0_ih; 438 struct item_head *tbS0_0_ih; 439 struct reiserfs_key *left_delim_key; 440 int ret, l_n, version, temp_l; 441 442 tbS0_pos_ih = item_head(tbS0, tb->item_pos); 443 tbS0_0_ih = item_head(tbS0, 0); 444 445 /* 446 * this bytes number must be appended 447 * to the last item of L[h] 448 */ 449 l_n = tb->lbytes - tb->pos_in_item; 450 451 /* Calculate new insert_size[0] */ 452 tb->insert_size[0] -= l_n; 453 454 RFALSE(tb->insert_size[0] <= 0, 455 "PAP-12105: there is nothing to paste into " 456 "L[0]. insert_size=%d", tb->insert_size[0]); 457 458 ret = leaf_shift_left(tb, tb->lnum[0], 459 ih_item_len(tbS0_pos_ih)); 460 461 tbL0_ih = item_head(tb->L[0], n + tb->item_pos - ret); 462 463 /* Append to body of item in L[0] */ 464 buffer_info_init_left(tb, &bi); 465 leaf_paste_in_buffer(&bi, n + tb->item_pos - ret, 466 ih_item_len(tbL0_ih), l_n, body, 467 min_t(int, l_n, tb->zeroes_num)); 468 469 /* 470 * 0-th item in S0 can be only of DIRECT type 471 * when l_n != 0 472 */ 473 temp_l = l_n; 474 475 RFALSE(ih_item_len(tbS0_0_ih), 476 "PAP-12106: item length must be 0"); 477 RFALSE(comp_short_le_keys(&tbS0_0_ih->ih_key, 478 leaf_key(tb->L[0], n + tb->item_pos - ret)), 479 "PAP-12107: items must be of the same file"); 480 481 if (is_indirect_le_ih(tbL0_ih)) { 482 int shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT; 483 temp_l = l_n << shift; 484 } 485 /* update key of first item in S0 */ 486 version = ih_version(tbS0_0_ih); 487 add_le_key_k_offset(version, &tbS0_0_ih->ih_key, temp_l); 488 489 /* update left delimiting key */ 490 left_delim_key = internal_key(tb->CFL[0], tb->lkey[0]); 491 add_le_key_k_offset(version, left_delim_key, temp_l); 492 493 /* 494 * Calculate new body, position in item and 495 * insert_size[0] 496 */ 497 if (l_n > tb->zeroes_num) { 498 body_shift_bytes = l_n - tb->zeroes_num; 499 tb->zeroes_num = 0; 500 } else 501 tb->zeroes_num -= l_n; 502 tb->pos_in_item = 0; 503 504 RFALSE(comp_short_le_keys(&tbS0_0_ih->ih_key, 505 leaf_key(tb->L[0], 506 B_NR_ITEMS(tb->L[0]) - 1)) || 507 !op_is_left_mergeable(leaf_key(tbS0, 0), tbS0->b_size) || 508 !op_is_left_mergeable(left_delim_key, tbS0->b_size), 509 "PAP-12120: item must be merge-able with left " 510 "neighboring item"); 511 } else { 512 /* only part of the appended item will be in L[0] */ 513 514 /* Calculate position in item for append in S[0] */ 515 tb->pos_in_item -= tb->lbytes; 516 517 RFALSE(tb->pos_in_item <= 0, 518 "PAP-12125: no place for paste. pos_in_item=%d", 519 tb->pos_in_item); 520 521 /* 522 * Shift lnum[0] - 1 items in whole. 523 * Shift lbytes - 1 byte from item number lnum[0] 524 */ 525 leaf_shift_left(tb, tb->lnum[0], tb->lbytes); 526 } 527 return body_shift_bytes; 528 } 529 530 531 /* appended item will be in L[0] in whole */ 532 static void balance_leaf_paste_left_whole(struct tree_balance *tb, 533 struct item_head * const ih, 534 const char * const body) 535 { 536 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); 537 int n = B_NR_ITEMS(tb->L[0]); 538 struct buffer_info bi; 539 struct item_head *pasted; 540 int ret; 541 542 /* if we paste into first item of S[0] and it is left mergable */ 543 if (!tb->item_pos && 544 op_is_left_mergeable(leaf_key(tbS0, 0), tbS0->b_size)) { 545 /* 546 * then increment pos_in_item by the size of the 547 * last item in L[0] 548 */ 549 pasted = item_head(tb->L[0], n - 1); 550 if (is_direntry_le_ih(pasted)) 551 tb->pos_in_item += ih_entry_count(pasted); 552 else 553 tb->pos_in_item += ih_item_len(pasted); 554 } 555 556 /* 557 * Shift lnum[0] - 1 items in whole. 558 * Shift lbytes - 1 byte from item number lnum[0] 559 */ 560 ret = leaf_shift_left(tb, tb->lnum[0], tb->lbytes); 561 562 /* Append to body of item in L[0] */ 563 buffer_info_init_left(tb, &bi); 564 leaf_paste_in_buffer(&bi, n + tb->item_pos - ret, tb->pos_in_item, 565 tb->insert_size[0], body, tb->zeroes_num); 566 567 /* if appended item is directory, paste entry */ 568 pasted = item_head(tb->L[0], n + tb->item_pos - ret); 569 if (is_direntry_le_ih(pasted)) 570 leaf_paste_entries(&bi, n + tb->item_pos - ret, 571 tb->pos_in_item, 1, 572 (struct reiserfs_de_head *)body, 573 body + DEH_SIZE, tb->insert_size[0]); 574 575 /* 576 * if appended item is indirect item, put unformatted node 577 * into un list 578 */ 579 if (is_indirect_le_ih(pasted)) 580 set_ih_free_space(pasted, 0); 581 582 tb->insert_size[0] = 0; 583 tb->zeroes_num = 0; 584 } 585 586 static unsigned int balance_leaf_paste_left(struct tree_balance *tb, 587 struct item_head * const ih, 588 const char * const body) 589 { 590 /* we must shift the part of the appended item */ 591 if (tb->item_pos == tb->lnum[0] - 1 && tb->lbytes != -1) 592 return balance_leaf_paste_left_shift(tb, ih, body); 593 else 594 balance_leaf_paste_left_whole(tb, ih, body); 595 return 0; 596 } 597 598 /* Shift lnum[0] items from S[0] to the left neighbor L[0] */ 599 static unsigned int balance_leaf_left(struct tree_balance *tb, 600 struct item_head * const ih, 601 const char * const body, int flag) 602 { 603 if (tb->lnum[0] <= 0) 604 return 0; 605 606 /* new item or it part falls to L[0], shift it too */ 607 if (tb->item_pos < tb->lnum[0]) { 608 BUG_ON(flag != M_INSERT && flag != M_PASTE); 609 610 if (flag == M_INSERT) 611 return balance_leaf_insert_left(tb, ih, body); 612 else /* M_PASTE */ 613 return balance_leaf_paste_left(tb, ih, body); 614 } else 615 /* new item doesn't fall into L[0] */ 616 leaf_shift_left(tb, tb->lnum[0], tb->lbytes); 617 return 0; 618 } 619 620 621 static void balance_leaf_insert_right(struct tree_balance *tb, 622 struct item_head * const ih, 623 const char * const body) 624 { 625 626 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); 627 int n = B_NR_ITEMS(tbS0); 628 struct buffer_info bi; 629 630 /* new item or part of it doesn't fall into R[0] */ 631 if (n - tb->rnum[0] >= tb->item_pos) { 632 leaf_shift_right(tb, tb->rnum[0], tb->rbytes); 633 return; 634 } 635 636 /* new item or its part falls to R[0] */ 637 638 /* part of new item falls into R[0] */ 639 if (tb->item_pos == n - tb->rnum[0] + 1 && tb->rbytes != -1) { 640 loff_t old_key_comp, old_len, r_zeroes_number; 641 const char *r_body; 642 int shift; 643 loff_t offset; 644 645 leaf_shift_right(tb, tb->rnum[0] - 1, -1); 646 647 /* Remember key component and item length */ 648 old_key_comp = le_ih_k_offset(ih); 649 old_len = ih_item_len(ih); 650 651 /* 652 * Calculate key component and item length to insert 653 * into R[0] 654 */ 655 shift = 0; 656 if (is_indirect_le_ih(ih)) 657 shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT; 658 offset = le_ih_k_offset(ih) + ((old_len - tb->rbytes) << shift); 659 set_le_ih_k_offset(ih, offset); 660 put_ih_item_len(ih, tb->rbytes); 661 662 /* Insert part of the item into R[0] */ 663 buffer_info_init_right(tb, &bi); 664 if ((old_len - tb->rbytes) > tb->zeroes_num) { 665 r_zeroes_number = 0; 666 r_body = body + (old_len - tb->rbytes) - tb->zeroes_num; 667 } else { 668 r_body = body; 669 r_zeroes_number = tb->zeroes_num - 670 (old_len - tb->rbytes); 671 tb->zeroes_num -= r_zeroes_number; 672 } 673 674 leaf_insert_into_buf(&bi, 0, ih, r_body, r_zeroes_number); 675 676 /* Replace right delimiting key by first key in R[0] */ 677 replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0); 678 679 /* 680 * Calculate key component and item length to 681 * insert into S[0] 682 */ 683 set_le_ih_k_offset(ih, old_key_comp); 684 put_ih_item_len(ih, old_len - tb->rbytes); 685 686 tb->insert_size[0] -= tb->rbytes; 687 688 } else { 689 /* whole new item falls into R[0] */ 690 691 /* Shift rnum[0]-1 items to R[0] */ 692 leaf_shift_right(tb, tb->rnum[0] - 1, tb->rbytes); 693 694 /* Insert new item into R[0] */ 695 buffer_info_init_right(tb, &bi); 696 leaf_insert_into_buf(&bi, tb->item_pos - n + tb->rnum[0] - 1, 697 ih, body, tb->zeroes_num); 698 699 if (tb->item_pos - n + tb->rnum[0] - 1 == 0) 700 replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0); 701 702 tb->zeroes_num = tb->insert_size[0] = 0; 703 } 704 } 705 706 707 static void balance_leaf_paste_right_shift_dirent(struct tree_balance *tb, 708 struct item_head * const ih, 709 const char * const body) 710 { 711 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); 712 struct buffer_info bi; 713 int entry_count; 714 715 RFALSE(tb->zeroes_num, 716 "PAP-12145: invalid parameter in case of a directory"); 717 entry_count = ih_entry_count(item_head(tbS0, tb->item_pos)); 718 719 /* new directory entry falls into R[0] */ 720 if (entry_count - tb->rbytes < tb->pos_in_item) { 721 int paste_entry_position; 722 723 RFALSE(tb->rbytes - 1 >= entry_count || !tb->insert_size[0], 724 "PAP-12150: no enough of entries to shift to R[0]: " 725 "rbytes=%d, entry_count=%d", tb->rbytes, entry_count); 726 727 /* 728 * Shift rnum[0]-1 items in whole. 729 * Shift rbytes-1 directory entries from directory 730 * item number rnum[0] 731 */ 732 leaf_shift_right(tb, tb->rnum[0], tb->rbytes - 1); 733 734 /* Paste given directory entry to directory item */ 735 paste_entry_position = tb->pos_in_item - entry_count + 736 tb->rbytes - 1; 737 buffer_info_init_right(tb, &bi); 738 leaf_paste_in_buffer(&bi, 0, paste_entry_position, 739 tb->insert_size[0], body, tb->zeroes_num); 740 741 /* paste entry */ 742 leaf_paste_entries(&bi, 0, paste_entry_position, 1, 743 (struct reiserfs_de_head *) body, 744 body + DEH_SIZE, tb->insert_size[0]); 745 746 /* change delimiting keys */ 747 if (paste_entry_position == 0) 748 replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0); 749 750 tb->insert_size[0] = 0; 751 tb->pos_in_item++; 752 } else { 753 /* new directory entry doesn't fall into R[0] */ 754 leaf_shift_right(tb, tb->rnum[0], tb->rbytes); 755 } 756 } 757 758 static void balance_leaf_paste_right_shift(struct tree_balance *tb, 759 struct item_head * const ih, 760 const char * const body) 761 { 762 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); 763 int n_shift, n_rem, r_zeroes_number, version; 764 unsigned long temp_rem; 765 const char *r_body; 766 struct buffer_info bi; 767 768 /* we append to directory item */ 769 if (is_direntry_le_ih(item_head(tbS0, tb->item_pos))) { 770 balance_leaf_paste_right_shift_dirent(tb, ih, body); 771 return; 772 } 773 774 /* regular object */ 775 776 /* 777 * Calculate number of bytes which must be shifted 778 * from appended item 779 */ 780 n_shift = tb->rbytes - tb->insert_size[0]; 781 if (n_shift < 0) 782 n_shift = 0; 783 784 RFALSE(tb->pos_in_item != ih_item_len(item_head(tbS0, tb->item_pos)), 785 "PAP-12155: invalid position to paste. ih_item_len=%d, " 786 "pos_in_item=%d", tb->pos_in_item, 787 ih_item_len(item_head(tbS0, tb->item_pos))); 788 789 leaf_shift_right(tb, tb->rnum[0], n_shift); 790 791 /* 792 * Calculate number of bytes which must remain in body 793 * after appending to R[0] 794 */ 795 n_rem = tb->insert_size[0] - tb->rbytes; 796 if (n_rem < 0) 797 n_rem = 0; 798 799 temp_rem = n_rem; 800 801 version = ih_version(item_head(tb->R[0], 0)); 802 803 if (is_indirect_le_key(version, leaf_key(tb->R[0], 0))) { 804 int shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT; 805 temp_rem = n_rem << shift; 806 } 807 808 add_le_key_k_offset(version, leaf_key(tb->R[0], 0), temp_rem); 809 add_le_key_k_offset(version, internal_key(tb->CFR[0], tb->rkey[0]), 810 temp_rem); 811 812 do_balance_mark_internal_dirty(tb, tb->CFR[0], 0); 813 814 /* Append part of body into R[0] */ 815 buffer_info_init_right(tb, &bi); 816 if (n_rem > tb->zeroes_num) { 817 r_zeroes_number = 0; 818 r_body = body + n_rem - tb->zeroes_num; 819 } else { 820 r_body = body; 821 r_zeroes_number = tb->zeroes_num - n_rem; 822 tb->zeroes_num -= r_zeroes_number; 823 } 824 825 leaf_paste_in_buffer(&bi, 0, n_shift, tb->insert_size[0] - n_rem, 826 r_body, r_zeroes_number); 827 828 if (is_indirect_le_ih(item_head(tb->R[0], 0))) 829 set_ih_free_space(item_head(tb->R[0], 0), 0); 830 831 tb->insert_size[0] = n_rem; 832 if (!n_rem) 833 tb->pos_in_item++; 834 } 835 836 static void balance_leaf_paste_right_whole(struct tree_balance *tb, 837 struct item_head * const ih, 838 const char * const body) 839 { 840 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); 841 int n = B_NR_ITEMS(tbS0); 842 struct item_head *pasted; 843 struct buffer_info bi; 844 845 buffer_info_init_right(tb, &bi); 846 leaf_shift_right(tb, tb->rnum[0], tb->rbytes); 847 848 /* append item in R[0] */ 849 if (tb->pos_in_item >= 0) { 850 buffer_info_init_right(tb, &bi); 851 leaf_paste_in_buffer(&bi, tb->item_pos - n + tb->rnum[0], 852 tb->pos_in_item, tb->insert_size[0], body, 853 tb->zeroes_num); 854 } 855 856 /* paste new entry, if item is directory item */ 857 pasted = item_head(tb->R[0], tb->item_pos - n + tb->rnum[0]); 858 if (is_direntry_le_ih(pasted) && tb->pos_in_item >= 0) { 859 leaf_paste_entries(&bi, tb->item_pos - n + tb->rnum[0], 860 tb->pos_in_item, 1, 861 (struct reiserfs_de_head *)body, 862 body + DEH_SIZE, tb->insert_size[0]); 863 864 if (!tb->pos_in_item) { 865 866 RFALSE(tb->item_pos - n + tb->rnum[0], 867 "PAP-12165: directory item must be first " 868 "item of node when pasting is in 0th position"); 869 870 /* update delimiting keys */ 871 replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0); 872 } 873 } 874 875 if (is_indirect_le_ih(pasted)) 876 set_ih_free_space(pasted, 0); 877 tb->zeroes_num = tb->insert_size[0] = 0; 878 } 879 880 static void balance_leaf_paste_right(struct tree_balance *tb, 881 struct item_head * const ih, 882 const char * const body) 883 { 884 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); 885 int n = B_NR_ITEMS(tbS0); 886 887 /* new item doesn't fall into R[0] */ 888 if (n - tb->rnum[0] > tb->item_pos) { 889 leaf_shift_right(tb, tb->rnum[0], tb->rbytes); 890 return; 891 } 892 893 /* pasted item or part of it falls to R[0] */ 894 895 if (tb->item_pos == n - tb->rnum[0] && tb->rbytes != -1) 896 /* we must shift the part of the appended item */ 897 balance_leaf_paste_right_shift(tb, ih, body); 898 else 899 /* pasted item in whole falls into R[0] */ 900 balance_leaf_paste_right_whole(tb, ih, body); 901 } 902 903 /* shift rnum[0] items from S[0] to the right neighbor R[0] */ 904 static void balance_leaf_right(struct tree_balance *tb, 905 struct item_head * const ih, 906 const char * const body, int flag) 907 { 908 if (tb->rnum[0] <= 0) 909 return; 910 911 BUG_ON(flag != M_INSERT && flag != M_PASTE); 912 913 if (flag == M_INSERT) 914 balance_leaf_insert_right(tb, ih, body); 915 else /* M_PASTE */ 916 balance_leaf_paste_right(tb, ih, body); 917 } 918 919 static void balance_leaf_new_nodes_insert(struct tree_balance *tb, 920 struct item_head * const ih, 921 const char * const body, 922 struct item_head *insert_key, 923 struct buffer_head **insert_ptr, 924 int i) 925 { 926 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); 927 int n = B_NR_ITEMS(tbS0); 928 struct buffer_info bi; 929 int shift; 930 931 /* new item or it part don't falls into S_new[i] */ 932 if (n - tb->snum[i] >= tb->item_pos) { 933 leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, 934 tb->snum[i], tb->sbytes[i], tb->S_new[i]); 935 return; 936 } 937 938 /* new item or it's part falls to first new node S_new[i] */ 939 940 /* part of new item falls into S_new[i] */ 941 if (tb->item_pos == n - tb->snum[i] + 1 && tb->sbytes[i] != -1) { 942 int old_key_comp, old_len, r_zeroes_number; 943 const char *r_body; 944 945 /* Move snum[i]-1 items from S[0] to S_new[i] */ 946 leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i] - 1, -1, 947 tb->S_new[i]); 948 949 /* Remember key component and item length */ 950 old_key_comp = le_ih_k_offset(ih); 951 old_len = ih_item_len(ih); 952 953 /* 954 * Calculate key component and item length to insert 955 * into S_new[i] 956 */ 957 shift = 0; 958 if (is_indirect_le_ih(ih)) 959 shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT; 960 set_le_ih_k_offset(ih, 961 le_ih_k_offset(ih) + 962 ((old_len - tb->sbytes[i]) << shift)); 963 964 put_ih_item_len(ih, tb->sbytes[i]); 965 966 /* Insert part of the item into S_new[i] before 0-th item */ 967 buffer_info_init_bh(tb, &bi, tb->S_new[i]); 968 969 if ((old_len - tb->sbytes[i]) > tb->zeroes_num) { 970 r_zeroes_number = 0; 971 r_body = body + (old_len - tb->sbytes[i]) - 972 tb->zeroes_num; 973 } else { 974 r_body = body; 975 r_zeroes_number = tb->zeroes_num - (old_len - 976 tb->sbytes[i]); 977 tb->zeroes_num -= r_zeroes_number; 978 } 979 980 leaf_insert_into_buf(&bi, 0, ih, r_body, r_zeroes_number); 981 982 /* 983 * Calculate key component and item length to 984 * insert into S[i] 985 */ 986 set_le_ih_k_offset(ih, old_key_comp); 987 put_ih_item_len(ih, old_len - tb->sbytes[i]); 988 tb->insert_size[0] -= tb->sbytes[i]; 989 } else { 990 /* whole new item falls into S_new[i] */ 991 992 /* 993 * Shift snum[0] - 1 items to S_new[i] 994 * (sbytes[i] of split item) 995 */ 996 leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, 997 tb->snum[i] - 1, tb->sbytes[i], tb->S_new[i]); 998 999 /* Insert new item into S_new[i] */ 1000 buffer_info_init_bh(tb, &bi, tb->S_new[i]); 1001 leaf_insert_into_buf(&bi, tb->item_pos - n + tb->snum[i] - 1, 1002 ih, body, tb->zeroes_num); 1003 1004 tb->zeroes_num = tb->insert_size[0] = 0; 1005 } 1006 } 1007 1008 /* we append to directory item */ 1009 static void balance_leaf_new_nodes_paste_dirent(struct tree_balance *tb, 1010 struct item_head * const ih, 1011 const char * const body, 1012 struct item_head *insert_key, 1013 struct buffer_head **insert_ptr, 1014 int i) 1015 { 1016 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); 1017 struct item_head *aux_ih = item_head(tbS0, tb->item_pos); 1018 int entry_count = ih_entry_count(aux_ih); 1019 struct buffer_info bi; 1020 1021 if (entry_count - tb->sbytes[i] < tb->pos_in_item && 1022 tb->pos_in_item <= entry_count) { 1023 /* new directory entry falls into S_new[i] */ 1024 1025 RFALSE(!tb->insert_size[0], 1026 "PAP-12215: insert_size is already 0"); 1027 RFALSE(tb->sbytes[i] - 1 >= entry_count, 1028 "PAP-12220: there are no so much entries (%d), only %d", 1029 tb->sbytes[i] - 1, entry_count); 1030 1031 /* 1032 * Shift snum[i]-1 items in whole. 1033 * Shift sbytes[i] directory entries 1034 * from directory item number snum[i] 1035 */ 1036 leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i], 1037 tb->sbytes[i] - 1, tb->S_new[i]); 1038 1039 /* 1040 * Paste given directory entry to 1041 * directory item 1042 */ 1043 buffer_info_init_bh(tb, &bi, tb->S_new[i]); 1044 leaf_paste_in_buffer(&bi, 0, tb->pos_in_item - entry_count + 1045 tb->sbytes[i] - 1, tb->insert_size[0], 1046 body, tb->zeroes_num); 1047 1048 /* paste new directory entry */ 1049 leaf_paste_entries(&bi, 0, tb->pos_in_item - entry_count + 1050 tb->sbytes[i] - 1, 1, 1051 (struct reiserfs_de_head *) body, 1052 body + DEH_SIZE, tb->insert_size[0]); 1053 1054 tb->insert_size[0] = 0; 1055 tb->pos_in_item++; 1056 } else { 1057 /* new directory entry doesn't fall into S_new[i] */ 1058 leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i], 1059 tb->sbytes[i], tb->S_new[i]); 1060 } 1061 1062 } 1063 1064 static void balance_leaf_new_nodes_paste_shift(struct tree_balance *tb, 1065 struct item_head * const ih, 1066 const char * const body, 1067 struct item_head *insert_key, 1068 struct buffer_head **insert_ptr, 1069 int i) 1070 { 1071 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); 1072 struct item_head *aux_ih = item_head(tbS0, tb->item_pos); 1073 int n_shift, n_rem, r_zeroes_number, shift; 1074 const char *r_body; 1075 struct item_head *tmp; 1076 struct buffer_info bi; 1077 1078 RFALSE(ih, "PAP-12210: ih must be 0"); 1079 1080 if (is_direntry_le_ih(aux_ih)) { 1081 balance_leaf_new_nodes_paste_dirent(tb, ih, body, insert_key, 1082 insert_ptr, i); 1083 return; 1084 } 1085 1086 /* regular object */ 1087 1088 1089 RFALSE(tb->pos_in_item != ih_item_len(item_head(tbS0, tb->item_pos)) || 1090 tb->insert_size[0] <= 0, 1091 "PAP-12225: item too short or insert_size <= 0"); 1092 1093 /* 1094 * Calculate number of bytes which must be shifted from appended item 1095 */ 1096 n_shift = tb->sbytes[i] - tb->insert_size[0]; 1097 if (n_shift < 0) 1098 n_shift = 0; 1099 leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i], n_shift, 1100 tb->S_new[i]); 1101 1102 /* 1103 * Calculate number of bytes which must remain in body after 1104 * append to S_new[i] 1105 */ 1106 n_rem = tb->insert_size[0] - tb->sbytes[i]; 1107 if (n_rem < 0) 1108 n_rem = 0; 1109 1110 /* Append part of body into S_new[0] */ 1111 buffer_info_init_bh(tb, &bi, tb->S_new[i]); 1112 if (n_rem > tb->zeroes_num) { 1113 r_zeroes_number = 0; 1114 r_body = body + n_rem - tb->zeroes_num; 1115 } else { 1116 r_body = body; 1117 r_zeroes_number = tb->zeroes_num - n_rem; 1118 tb->zeroes_num -= r_zeroes_number; 1119 } 1120 1121 leaf_paste_in_buffer(&bi, 0, n_shift, tb->insert_size[0] - n_rem, 1122 r_body, r_zeroes_number); 1123 1124 tmp = item_head(tb->S_new[i], 0); 1125 shift = 0; 1126 if (is_indirect_le_ih(tmp)) { 1127 set_ih_free_space(tmp, 0); 1128 shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT; 1129 } 1130 add_le_ih_k_offset(tmp, n_rem << shift); 1131 1132 tb->insert_size[0] = n_rem; 1133 if (!n_rem) 1134 tb->pos_in_item++; 1135 } 1136 1137 static void balance_leaf_new_nodes_paste_whole(struct tree_balance *tb, 1138 struct item_head * const ih, 1139 const char * const body, 1140 struct item_head *insert_key, 1141 struct buffer_head **insert_ptr, 1142 int i) 1143 1144 { 1145 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); 1146 int n = B_NR_ITEMS(tbS0); 1147 int leaf_mi; 1148 struct item_head *pasted; 1149 struct buffer_info bi; 1150 1151 #ifdef CONFIG_REISERFS_CHECK 1152 struct item_head *ih_check = item_head(tbS0, tb->item_pos); 1153 1154 if (!is_direntry_le_ih(ih_check) && 1155 (tb->pos_in_item != ih_item_len(ih_check) || 1156 tb->insert_size[0] <= 0)) 1157 reiserfs_panic(tb->tb_sb, 1158 "PAP-12235", 1159 "pos_in_item must be equal to ih_item_len"); 1160 #endif 1161 1162 leaf_mi = leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i], 1163 tb->sbytes[i], tb->S_new[i]); 1164 1165 RFALSE(leaf_mi, 1166 "PAP-12240: unexpected value returned by leaf_move_items (%d)", 1167 leaf_mi); 1168 1169 /* paste into item */ 1170 buffer_info_init_bh(tb, &bi, tb->S_new[i]); 1171 leaf_paste_in_buffer(&bi, tb->item_pos - n + tb->snum[i], 1172 tb->pos_in_item, tb->insert_size[0], 1173 body, tb->zeroes_num); 1174 1175 pasted = item_head(tb->S_new[i], tb->item_pos - n + 1176 tb->snum[i]); 1177 if (is_direntry_le_ih(pasted)) 1178 leaf_paste_entries(&bi, tb->item_pos - n + tb->snum[i], 1179 tb->pos_in_item, 1, 1180 (struct reiserfs_de_head *)body, 1181 body + DEH_SIZE, tb->insert_size[0]); 1182 1183 /* if we paste to indirect item update ih_free_space */ 1184 if (is_indirect_le_ih(pasted)) 1185 set_ih_free_space(pasted, 0); 1186 1187 tb->zeroes_num = tb->insert_size[0] = 0; 1188 1189 } 1190 static void balance_leaf_new_nodes_paste(struct tree_balance *tb, 1191 struct item_head * const ih, 1192 const char * const body, 1193 struct item_head *insert_key, 1194 struct buffer_head **insert_ptr, 1195 int i) 1196 { 1197 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); 1198 int n = B_NR_ITEMS(tbS0); 1199 1200 /* pasted item doesn't fall into S_new[i] */ 1201 if (n - tb->snum[i] > tb->item_pos) { 1202 leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, 1203 tb->snum[i], tb->sbytes[i], tb->S_new[i]); 1204 return; 1205 } 1206 1207 /* pasted item or part if it falls to S_new[i] */ 1208 1209 if (tb->item_pos == n - tb->snum[i] && tb->sbytes[i] != -1) 1210 /* we must shift part of the appended item */ 1211 balance_leaf_new_nodes_paste_shift(tb, ih, body, insert_key, 1212 insert_ptr, i); 1213 else 1214 /* item falls wholly into S_new[i] */ 1215 balance_leaf_new_nodes_paste_whole(tb, ih, body, insert_key, 1216 insert_ptr, i); 1217 } 1218 1219 /* Fill new nodes that appear in place of S[0] */ 1220 static void balance_leaf_new_nodes(struct tree_balance *tb, 1221 struct item_head * const ih, 1222 const char * const body, 1223 struct item_head *insert_key, 1224 struct buffer_head **insert_ptr, 1225 int flag) 1226 { 1227 int i; 1228 for (i = tb->blknum[0] - 2; i >= 0; i--) { 1229 BUG_ON(flag != M_INSERT && flag != M_PASTE); 1230 1231 RFALSE(!tb->snum[i], 1232 "PAP-12200: snum[%d] == %d. Must be > 0", i, 1233 tb->snum[i]); 1234 1235 /* here we shift from S to S_new nodes */ 1236 1237 tb->S_new[i] = get_FEB(tb); 1238 1239 /* initialized block type and tree level */ 1240 set_blkh_level(B_BLK_HEAD(tb->S_new[i]), DISK_LEAF_NODE_LEVEL); 1241 1242 if (flag == M_INSERT) 1243 balance_leaf_new_nodes_insert(tb, ih, body, insert_key, 1244 insert_ptr, i); 1245 else /* M_PASTE */ 1246 balance_leaf_new_nodes_paste(tb, ih, body, insert_key, 1247 insert_ptr, i); 1248 1249 memcpy(insert_key + i, leaf_key(tb->S_new[i], 0), KEY_SIZE); 1250 insert_ptr[i] = tb->S_new[i]; 1251 1252 RFALSE(!buffer_journaled(tb->S_new[i]) 1253 || buffer_journal_dirty(tb->S_new[i]) 1254 || buffer_dirty(tb->S_new[i]), 1255 "PAP-12247: S_new[%d] : (%b)", 1256 i, tb->S_new[i]); 1257 } 1258 } 1259 1260 static void balance_leaf_finish_node_insert(struct tree_balance *tb, 1261 struct item_head * const ih, 1262 const char * const body) 1263 { 1264 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); 1265 struct buffer_info bi; 1266 buffer_info_init_tbS0(tb, &bi); 1267 leaf_insert_into_buf(&bi, tb->item_pos, ih, body, tb->zeroes_num); 1268 1269 /* If we insert the first key change the delimiting key */ 1270 if (tb->item_pos == 0) { 1271 if (tb->CFL[0]) /* can be 0 in reiserfsck */ 1272 replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0, 0); 1273 1274 } 1275 } 1276 1277 static void balance_leaf_finish_node_paste_dirent(struct tree_balance *tb, 1278 struct item_head * const ih, 1279 const char * const body) 1280 { 1281 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); 1282 struct item_head *pasted = item_head(tbS0, tb->item_pos); 1283 struct buffer_info bi; 1284 1285 if (tb->pos_in_item >= 0 && tb->pos_in_item <= ih_entry_count(pasted)) { 1286 RFALSE(!tb->insert_size[0], 1287 "PAP-12260: insert_size is 0 already"); 1288 1289 /* prepare space */ 1290 buffer_info_init_tbS0(tb, &bi); 1291 leaf_paste_in_buffer(&bi, tb->item_pos, tb->pos_in_item, 1292 tb->insert_size[0], body, tb->zeroes_num); 1293 1294 /* paste entry */ 1295 leaf_paste_entries(&bi, tb->item_pos, tb->pos_in_item, 1, 1296 (struct reiserfs_de_head *)body, 1297 body + DEH_SIZE, tb->insert_size[0]); 1298 1299 if (!tb->item_pos && !tb->pos_in_item) { 1300 RFALSE(!tb->CFL[0] || !tb->L[0], 1301 "PAP-12270: CFL[0]/L[0] must be specified"); 1302 if (tb->CFL[0]) 1303 replace_key(tb, tb->CFL[0], tb->lkey[0], 1304 tbS0, 0); 1305 } 1306 1307 tb->insert_size[0] = 0; 1308 } 1309 } 1310 1311 static void balance_leaf_finish_node_paste(struct tree_balance *tb, 1312 struct item_head * const ih, 1313 const char * const body) 1314 { 1315 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); 1316 struct buffer_info bi; 1317 struct item_head *pasted = item_head(tbS0, tb->item_pos); 1318 1319 /* when directory, may be new entry already pasted */ 1320 if (is_direntry_le_ih(pasted)) { 1321 balance_leaf_finish_node_paste_dirent(tb, ih, body); 1322 return; 1323 } 1324 1325 /* regular object */ 1326 1327 if (tb->pos_in_item == ih_item_len(pasted)) { 1328 RFALSE(tb->insert_size[0] <= 0, 1329 "PAP-12275: insert size must not be %d", 1330 tb->insert_size[0]); 1331 buffer_info_init_tbS0(tb, &bi); 1332 leaf_paste_in_buffer(&bi, tb->item_pos, 1333 tb->pos_in_item, tb->insert_size[0], body, 1334 tb->zeroes_num); 1335 1336 if (is_indirect_le_ih(pasted)) 1337 set_ih_free_space(pasted, 0); 1338 1339 tb->insert_size[0] = 0; 1340 } 1341 #ifdef CONFIG_REISERFS_CHECK 1342 else if (tb->insert_size[0]) { 1343 print_cur_tb("12285"); 1344 reiserfs_panic(tb->tb_sb, "PAP-12285", 1345 "insert_size must be 0 (%d)", tb->insert_size[0]); 1346 } 1347 #endif 1348 } 1349 1350 /* 1351 * if the affected item was not wholly shifted then we 1352 * perform all necessary operations on that part or whole 1353 * of the affected item which remains in S 1354 */ 1355 static void balance_leaf_finish_node(struct tree_balance *tb, 1356 struct item_head * const ih, 1357 const char * const body, int flag) 1358 { 1359 /* if we must insert or append into buffer S[0] */ 1360 if (0 <= tb->item_pos && tb->item_pos < tb->s0num) { 1361 if (flag == M_INSERT) 1362 balance_leaf_finish_node_insert(tb, ih, body); 1363 else /* M_PASTE */ 1364 balance_leaf_finish_node_paste(tb, ih, body); 1365 } 1366 } 1367 1368 /** 1369 * balance_leaf - reiserfs tree balancing algorithm 1370 * @tb: tree balance state 1371 * @ih: item header of inserted item (little endian) 1372 * @body: body of inserted item or bytes to paste 1373 * @flag: i - insert, d - delete, c - cut, p - paste (see do_balance) 1374 * passed back: 1375 * @insert_key: key to insert new nodes 1376 * @insert_ptr: array of nodes to insert at the next level 1377 * 1378 * In our processing of one level we sometimes determine what must be 1379 * inserted into the next higher level. This insertion consists of a 1380 * key or two keys and their corresponding pointers. 1381 */ 1382 static int balance_leaf(struct tree_balance *tb, struct item_head *ih, 1383 const char *body, int flag, 1384 struct item_head *insert_key, 1385 struct buffer_head **insert_ptr) 1386 { 1387 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path); 1388 1389 PROC_INFO_INC(tb->tb_sb, balance_at[0]); 1390 1391 /* Make balance in case insert_size[0] < 0 */ 1392 if (tb->insert_size[0] < 0) 1393 return balance_leaf_when_delete(tb, flag); 1394 1395 tb->item_pos = PATH_LAST_POSITION(tb->tb_path), 1396 tb->pos_in_item = tb->tb_path->pos_in_item, 1397 tb->zeroes_num = 0; 1398 if (flag == M_INSERT && !body) 1399 tb->zeroes_num = ih_item_len(ih); 1400 1401 /* 1402 * for indirect item pos_in_item is measured in unformatted node 1403 * pointers. Recalculate to bytes 1404 */ 1405 if (flag != M_INSERT 1406 && is_indirect_le_ih(item_head(tbS0, tb->item_pos))) 1407 tb->pos_in_item *= UNFM_P_SIZE; 1408 1409 body += balance_leaf_left(tb, ih, body, flag); 1410 1411 /* tb->lnum[0] > 0 */ 1412 /* Calculate new item position */ 1413 tb->item_pos -= (tb->lnum[0] - ((tb->lbytes != -1) ? 1 : 0)); 1414 1415 balance_leaf_right(tb, ih, body, flag); 1416 1417 /* tb->rnum[0] > 0 */ 1418 RFALSE(tb->blknum[0] > 3, 1419 "PAP-12180: blknum can not be %d. It must be <= 3", tb->blknum[0]); 1420 RFALSE(tb->blknum[0] < 0, 1421 "PAP-12185: blknum can not be %d. It must be >= 0", tb->blknum[0]); 1422 1423 /* 1424 * if while adding to a node we discover that it is possible to split 1425 * it in two, and merge the left part into the left neighbor and the 1426 * right part into the right neighbor, eliminating the node 1427 */ 1428 if (tb->blknum[0] == 0) { /* node S[0] is empty now */ 1429 1430 RFALSE(!tb->lnum[0] || !tb->rnum[0], 1431 "PAP-12190: lnum and rnum must not be zero"); 1432 /* 1433 * if insertion was done before 0-th position in R[0], right 1434 * delimiting key of the tb->L[0]'s and left delimiting key are 1435 * not set correctly 1436 */ 1437 if (tb->CFL[0]) { 1438 if (!tb->CFR[0]) 1439 reiserfs_panic(tb->tb_sb, "vs-12195", 1440 "CFR not initialized"); 1441 copy_key(internal_key(tb->CFL[0], tb->lkey[0]), 1442 internal_key(tb->CFR[0], tb->rkey[0])); 1443 do_balance_mark_internal_dirty(tb, tb->CFL[0], 0); 1444 } 1445 1446 reiserfs_invalidate_buffer(tb, tbS0); 1447 return 0; 1448 } 1449 1450 balance_leaf_new_nodes(tb, ih, body, insert_key, insert_ptr, flag); 1451 1452 balance_leaf_finish_node(tb, ih, body, flag); 1453 1454 #ifdef CONFIG_REISERFS_CHECK 1455 if (flag == M_PASTE && tb->insert_size[0]) { 1456 print_cur_tb("12290"); 1457 reiserfs_panic(tb->tb_sb, 1458 "PAP-12290", "insert_size is still not 0 (%d)", 1459 tb->insert_size[0]); 1460 } 1461 #endif 1462 1463 /* Leaf level of the tree is balanced (end of balance_leaf) */ 1464 return 0; 1465 } 1466 1467 /* Make empty node */ 1468 void make_empty_node(struct buffer_info *bi) 1469 { 1470 struct block_head *blkh; 1471 1472 RFALSE(bi->bi_bh == NULL, "PAP-12295: pointer to the buffer is NULL"); 1473 1474 blkh = B_BLK_HEAD(bi->bi_bh); 1475 set_blkh_nr_item(blkh, 0); 1476 set_blkh_free_space(blkh, MAX_CHILD_SIZE(bi->bi_bh)); 1477 1478 if (bi->bi_parent) 1479 B_N_CHILD(bi->bi_parent, bi->bi_position)->dc_size = 0; /* Endian safe if 0 */ 1480 } 1481 1482 /* Get first empty buffer */ 1483 struct buffer_head *get_FEB(struct tree_balance *tb) 1484 { 1485 int i; 1486 struct buffer_info bi; 1487 1488 for (i = 0; i < MAX_FEB_SIZE; i++) 1489 if (tb->FEB[i] != NULL) 1490 break; 1491 1492 if (i == MAX_FEB_SIZE) 1493 reiserfs_panic(tb->tb_sb, "vs-12300", "FEB list is empty"); 1494 1495 buffer_info_init_bh(tb, &bi, tb->FEB[i]); 1496 make_empty_node(&bi); 1497 set_buffer_uptodate(tb->FEB[i]); 1498 tb->used[i] = tb->FEB[i]; 1499 tb->FEB[i] = NULL; 1500 1501 return tb->used[i]; 1502 } 1503 1504 /* This is now used because reiserfs_free_block has to be able to schedule. */ 1505 static void store_thrown(struct tree_balance *tb, struct buffer_head *bh) 1506 { 1507 int i; 1508 1509 if (buffer_dirty(bh)) 1510 reiserfs_warning(tb->tb_sb, "reiserfs-12320", 1511 "called with dirty buffer"); 1512 for (i = 0; i < ARRAY_SIZE(tb->thrown); i++) 1513 if (!tb->thrown[i]) { 1514 tb->thrown[i] = bh; 1515 get_bh(bh); /* free_thrown puts this */ 1516 return; 1517 } 1518 reiserfs_warning(tb->tb_sb, "reiserfs-12321", 1519 "too many thrown buffers"); 1520 } 1521 1522 static void free_thrown(struct tree_balance *tb) 1523 { 1524 int i; 1525 b_blocknr_t blocknr; 1526 for (i = 0; i < ARRAY_SIZE(tb->thrown); i++) { 1527 if (tb->thrown[i]) { 1528 blocknr = tb->thrown[i]->b_blocknr; 1529 if (buffer_dirty(tb->thrown[i])) 1530 reiserfs_warning(tb->tb_sb, "reiserfs-12322", 1531 "called with dirty buffer %d", 1532 blocknr); 1533 brelse(tb->thrown[i]); /* incremented in store_thrown */ 1534 reiserfs_free_block(tb->transaction_handle, NULL, 1535 blocknr, 0); 1536 } 1537 } 1538 } 1539 1540 void reiserfs_invalidate_buffer(struct tree_balance *tb, struct buffer_head *bh) 1541 { 1542 struct block_head *blkh; 1543 blkh = B_BLK_HEAD(bh); 1544 set_blkh_level(blkh, FREE_LEVEL); 1545 set_blkh_nr_item(blkh, 0); 1546 1547 clear_buffer_dirty(bh); 1548 store_thrown(tb, bh); 1549 } 1550 1551 /* Replace n_dest'th key in buffer dest by n_src'th key of buffer src.*/ 1552 void replace_key(struct tree_balance *tb, struct buffer_head *dest, int n_dest, 1553 struct buffer_head *src, int n_src) 1554 { 1555 1556 RFALSE(dest == NULL || src == NULL, 1557 "vs-12305: source or destination buffer is 0 (src=%p, dest=%p)", 1558 src, dest); 1559 RFALSE(!B_IS_KEYS_LEVEL(dest), 1560 "vs-12310: invalid level (%z) for destination buffer. dest must be leaf", 1561 dest); 1562 RFALSE(n_dest < 0 || n_src < 0, 1563 "vs-12315: src(%d) or dest(%d) key number < 0", n_src, n_dest); 1564 RFALSE(n_dest >= B_NR_ITEMS(dest) || n_src >= B_NR_ITEMS(src), 1565 "vs-12320: src(%d(%d)) or dest(%d(%d)) key number is too big", 1566 n_src, B_NR_ITEMS(src), n_dest, B_NR_ITEMS(dest)); 1567 1568 if (B_IS_ITEMS_LEVEL(src)) 1569 /* source buffer contains leaf node */ 1570 memcpy(internal_key(dest, n_dest), item_head(src, n_src), 1571 KEY_SIZE); 1572 else 1573 memcpy(internal_key(dest, n_dest), internal_key(src, n_src), 1574 KEY_SIZE); 1575 1576 do_balance_mark_internal_dirty(tb, dest, 0); 1577 } 1578 1579 int get_left_neighbor_position(struct tree_balance *tb, int h) 1580 { 1581 int Sh_position = PATH_H_POSITION(tb->tb_path, h + 1); 1582 1583 RFALSE(PATH_H_PPARENT(tb->tb_path, h) == NULL || tb->FL[h] == NULL, 1584 "vs-12325: FL[%d](%p) or F[%d](%p) does not exist", 1585 h, tb->FL[h], h, PATH_H_PPARENT(tb->tb_path, h)); 1586 1587 if (Sh_position == 0) 1588 return B_NR_ITEMS(tb->FL[h]); 1589 else 1590 return Sh_position - 1; 1591 } 1592 1593 int get_right_neighbor_position(struct tree_balance *tb, int h) 1594 { 1595 int Sh_position = PATH_H_POSITION(tb->tb_path, h + 1); 1596 1597 RFALSE(PATH_H_PPARENT(tb->tb_path, h) == NULL || tb->FR[h] == NULL, 1598 "vs-12330: F[%d](%p) or FR[%d](%p) does not exist", 1599 h, PATH_H_PPARENT(tb->tb_path, h), h, tb->FR[h]); 1600 1601 if (Sh_position == B_NR_ITEMS(PATH_H_PPARENT(tb->tb_path, h))) 1602 return 0; 1603 else 1604 return Sh_position + 1; 1605 } 1606 1607 #ifdef CONFIG_REISERFS_CHECK 1608 1609 int is_reusable(struct super_block *s, b_blocknr_t block, int bit_value); 1610 static void check_internal_node(struct super_block *s, struct buffer_head *bh, 1611 char *mes) 1612 { 1613 struct disk_child *dc; 1614 int i; 1615 1616 RFALSE(!bh, "PAP-12336: bh == 0"); 1617 1618 if (!bh || !B_IS_IN_TREE(bh)) 1619 return; 1620 1621 RFALSE(!buffer_dirty(bh) && 1622 !(buffer_journaled(bh) || buffer_journal_dirty(bh)), 1623 "PAP-12337: buffer (%b) must be dirty", bh); 1624 dc = B_N_CHILD(bh, 0); 1625 1626 for (i = 0; i <= B_NR_ITEMS(bh); i++, dc++) { 1627 if (!is_reusable(s, dc_block_number(dc), 1)) { 1628 print_cur_tb(mes); 1629 reiserfs_panic(s, "PAP-12338", 1630 "invalid child pointer %y in %b", 1631 dc, bh); 1632 } 1633 } 1634 } 1635 1636 static int locked_or_not_in_tree(struct tree_balance *tb, 1637 struct buffer_head *bh, char *which) 1638 { 1639 if ((!buffer_journal_prepared(bh) && buffer_locked(bh)) || 1640 !B_IS_IN_TREE(bh)) { 1641 reiserfs_warning(tb->tb_sb, "vs-12339", "%s (%b)", which, bh); 1642 return 1; 1643 } 1644 return 0; 1645 } 1646 1647 static int check_before_balancing(struct tree_balance *tb) 1648 { 1649 int retval = 0; 1650 1651 if (REISERFS_SB(tb->tb_sb)->cur_tb) { 1652 reiserfs_panic(tb->tb_sb, "vs-12335", "suspect that schedule " 1653 "occurred based on cur_tb not being null at " 1654 "this point in code. do_balance cannot properly " 1655 "handle concurrent tree accesses on a same " 1656 "mount point."); 1657 } 1658 1659 /* 1660 * double check that buffers that we will modify are unlocked. 1661 * (fix_nodes should already have prepped all of these for us). 1662 */ 1663 if (tb->lnum[0]) { 1664 retval |= locked_or_not_in_tree(tb, tb->L[0], "L[0]"); 1665 retval |= locked_or_not_in_tree(tb, tb->FL[0], "FL[0]"); 1666 retval |= locked_or_not_in_tree(tb, tb->CFL[0], "CFL[0]"); 1667 check_leaf(tb->L[0]); 1668 } 1669 if (tb->rnum[0]) { 1670 retval |= locked_or_not_in_tree(tb, tb->R[0], "R[0]"); 1671 retval |= locked_or_not_in_tree(tb, tb->FR[0], "FR[0]"); 1672 retval |= locked_or_not_in_tree(tb, tb->CFR[0], "CFR[0]"); 1673 check_leaf(tb->R[0]); 1674 } 1675 retval |= locked_or_not_in_tree(tb, PATH_PLAST_BUFFER(tb->tb_path), 1676 "S[0]"); 1677 check_leaf(PATH_PLAST_BUFFER(tb->tb_path)); 1678 1679 return retval; 1680 } 1681 1682 static void check_after_balance_leaf(struct tree_balance *tb) 1683 { 1684 if (tb->lnum[0]) { 1685 if (B_FREE_SPACE(tb->L[0]) != 1686 MAX_CHILD_SIZE(tb->L[0]) - 1687 dc_size(B_N_CHILD 1688 (tb->FL[0], get_left_neighbor_position(tb, 0)))) { 1689 print_cur_tb("12221"); 1690 reiserfs_panic(tb->tb_sb, "PAP-12355", 1691 "shift to left was incorrect"); 1692 } 1693 } 1694 if (tb->rnum[0]) { 1695 if (B_FREE_SPACE(tb->R[0]) != 1696 MAX_CHILD_SIZE(tb->R[0]) - 1697 dc_size(B_N_CHILD 1698 (tb->FR[0], get_right_neighbor_position(tb, 0)))) { 1699 print_cur_tb("12222"); 1700 reiserfs_panic(tb->tb_sb, "PAP-12360", 1701 "shift to right was incorrect"); 1702 } 1703 } 1704 if (PATH_H_PBUFFER(tb->tb_path, 1) && 1705 (B_FREE_SPACE(PATH_H_PBUFFER(tb->tb_path, 0)) != 1706 (MAX_CHILD_SIZE(PATH_H_PBUFFER(tb->tb_path, 0)) - 1707 dc_size(B_N_CHILD(PATH_H_PBUFFER(tb->tb_path, 1), 1708 PATH_H_POSITION(tb->tb_path, 1)))))) { 1709 int left = B_FREE_SPACE(PATH_H_PBUFFER(tb->tb_path, 0)); 1710 int right = (MAX_CHILD_SIZE(PATH_H_PBUFFER(tb->tb_path, 0)) - 1711 dc_size(B_N_CHILD(PATH_H_PBUFFER(tb->tb_path, 1), 1712 PATH_H_POSITION(tb->tb_path, 1713 1)))); 1714 print_cur_tb("12223"); 1715 reiserfs_warning(tb->tb_sb, "reiserfs-12363", 1716 "B_FREE_SPACE (PATH_H_PBUFFER(tb->tb_path,0)) = %d; " 1717 "MAX_CHILD_SIZE (%d) - dc_size( %y, %d ) [%d] = %d", 1718 left, 1719 MAX_CHILD_SIZE(PATH_H_PBUFFER(tb->tb_path, 0)), 1720 PATH_H_PBUFFER(tb->tb_path, 1), 1721 PATH_H_POSITION(tb->tb_path, 1), 1722 dc_size(B_N_CHILD 1723 (PATH_H_PBUFFER(tb->tb_path, 1), 1724 PATH_H_POSITION(tb->tb_path, 1))), 1725 right); 1726 reiserfs_panic(tb->tb_sb, "PAP-12365", "S is incorrect"); 1727 } 1728 } 1729 1730 static void check_leaf_level(struct tree_balance *tb) 1731 { 1732 check_leaf(tb->L[0]); 1733 check_leaf(tb->R[0]); 1734 check_leaf(PATH_PLAST_BUFFER(tb->tb_path)); 1735 } 1736 1737 static void check_internal_levels(struct tree_balance *tb) 1738 { 1739 int h; 1740 1741 /* check all internal nodes */ 1742 for (h = 1; tb->insert_size[h]; h++) { 1743 check_internal_node(tb->tb_sb, PATH_H_PBUFFER(tb->tb_path, h), 1744 "BAD BUFFER ON PATH"); 1745 if (tb->lnum[h]) 1746 check_internal_node(tb->tb_sb, tb->L[h], "BAD L"); 1747 if (tb->rnum[h]) 1748 check_internal_node(tb->tb_sb, tb->R[h], "BAD R"); 1749 } 1750 1751 } 1752 1753 #endif 1754 1755 /* 1756 * Now we have all of the buffers that must be used in balancing of 1757 * the tree. We rely on the assumption that schedule() will not occur 1758 * while do_balance works. ( Only interrupt handlers are acceptable.) 1759 * We balance the tree according to the analysis made before this, 1760 * using buffers already obtained. For SMP support it will someday be 1761 * necessary to add ordered locking of tb. 1762 */ 1763 1764 /* 1765 * Some interesting rules of balancing: 1766 * we delete a maximum of two nodes per level per balancing: we never 1767 * delete R, when we delete two of three nodes L, S, R then we move 1768 * them into R. 1769 * 1770 * we only delete L if we are deleting two nodes, if we delete only 1771 * one node we delete S 1772 * 1773 * if we shift leaves then we shift as much as we can: this is a 1774 * deliberate policy of extremism in node packing which results in 1775 * higher average utilization after repeated random balance operations 1776 * at the cost of more memory copies and more balancing as a result of 1777 * small insertions to full nodes. 1778 * 1779 * if we shift internal nodes we try to evenly balance the node 1780 * utilization, with consequent less balancing at the cost of lower 1781 * utilization. 1782 * 1783 * one could argue that the policy for directories in leaves should be 1784 * that of internal nodes, but we will wait until another day to 1785 * evaluate this.... It would be nice to someday measure and prove 1786 * these assumptions as to what is optimal.... 1787 */ 1788 1789 static inline void do_balance_starts(struct tree_balance *tb) 1790 { 1791 /* use print_cur_tb() to see initial state of struct tree_balance */ 1792 1793 /* store_print_tb (tb); */ 1794 1795 /* do not delete, just comment it out */ 1796 /* 1797 print_tb(flag, PATH_LAST_POSITION(tb->tb_path), 1798 tb->tb_path->pos_in_item, tb, "check"); 1799 */ 1800 RFALSE(check_before_balancing(tb), "PAP-12340: locked buffers in TB"); 1801 #ifdef CONFIG_REISERFS_CHECK 1802 REISERFS_SB(tb->tb_sb)->cur_tb = tb; 1803 #endif 1804 } 1805 1806 static inline void do_balance_completed(struct tree_balance *tb) 1807 { 1808 1809 #ifdef CONFIG_REISERFS_CHECK 1810 check_leaf_level(tb); 1811 check_internal_levels(tb); 1812 REISERFS_SB(tb->tb_sb)->cur_tb = NULL; 1813 #endif 1814 1815 /* 1816 * reiserfs_free_block is no longer schedule safe. So, we need to 1817 * put the buffers we want freed on the thrown list during do_balance, 1818 * and then free them now 1819 */ 1820 1821 REISERFS_SB(tb->tb_sb)->s_do_balance++; 1822 1823 /* release all nodes hold to perform the balancing */ 1824 unfix_nodes(tb); 1825 1826 free_thrown(tb); 1827 } 1828 1829 /* 1830 * do_balance - balance the tree 1831 * 1832 * @tb: tree_balance structure 1833 * @ih: item header of inserted item 1834 * @body: body of inserted item or bytes to paste 1835 * @flag: 'i' - insert, 'd' - delete, 'c' - cut, 'p' paste 1836 * 1837 * Cut means delete part of an item (includes removing an entry from a 1838 * directory). 1839 * 1840 * Delete means delete whole item. 1841 * 1842 * Insert means add a new item into the tree. 1843 * 1844 * Paste means to append to the end of an existing file or to 1845 * insert a directory entry. 1846 */ 1847 void do_balance(struct tree_balance *tb, struct item_head *ih, 1848 const char *body, int flag) 1849 { 1850 int child_pos; /* position of a child node in its parent */ 1851 int h; /* level of the tree being processed */ 1852 1853 /* 1854 * in our processing of one level we sometimes determine what 1855 * must be inserted into the next higher level. This insertion 1856 * consists of a key or two keys and their corresponding 1857 * pointers 1858 */ 1859 struct item_head insert_key[2]; 1860 1861 /* inserted node-ptrs for the next level */ 1862 struct buffer_head *insert_ptr[2]; 1863 1864 tb->tb_mode = flag; 1865 tb->need_balance_dirty = 0; 1866 1867 if (FILESYSTEM_CHANGED_TB(tb)) { 1868 reiserfs_panic(tb->tb_sb, "clm-6000", "fs generation has " 1869 "changed"); 1870 } 1871 /* if we have no real work to do */ 1872 if (!tb->insert_size[0]) { 1873 reiserfs_warning(tb->tb_sb, "PAP-12350", 1874 "insert_size == 0, mode == %c", flag); 1875 unfix_nodes(tb); 1876 return; 1877 } 1878 1879 atomic_inc(&fs_generation(tb->tb_sb)); 1880 do_balance_starts(tb); 1881 1882 /* 1883 * balance_leaf returns 0 except if combining L R and S into 1884 * one node. see balance_internal() for explanation of this 1885 * line of code. 1886 */ 1887 child_pos = PATH_H_B_ITEM_ORDER(tb->tb_path, 0) + 1888 balance_leaf(tb, ih, body, flag, insert_key, insert_ptr); 1889 1890 #ifdef CONFIG_REISERFS_CHECK 1891 check_after_balance_leaf(tb); 1892 #endif 1893 1894 /* Balance internal level of the tree. */ 1895 for (h = 1; h < MAX_HEIGHT && tb->insert_size[h]; h++) 1896 child_pos = balance_internal(tb, h, child_pos, insert_key, 1897 insert_ptr); 1898 1899 do_balance_completed(tb); 1900 } 1901