projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'for-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/kishon/linux...
[deliverable/linux.git] / fs / nilfs2 / btree.c
1 /*
2 * btree.c - NILFS B-tree.
3 *
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Written by Koji Sato <koji@osrg.net>.
21 */
22
23 #include <linux/slab.h>
24 #include <linux/string.h>
25 #include <linux/errno.h>
26 #include <linux/pagevec.h>
27 #include "nilfs.h"
28 #include "page.h"
29 #include "btnode.h"
30 #include "btree.h"
31 #include "alloc.h"
32 #include "dat.h"
33
34 static void __nilfs_btree_init(struct nilfs_bmap *bmap);
35
36 static struct nilfs_btree_path *nilfs_btree_alloc_path(void)
37 {
38 struct nilfs_btree_path *path;
39 int level = NILFS_BTREE_LEVEL_DATA;
40
41 path = kmem_cache_alloc(nilfs_btree_path_cache, GFP_NOFS);
42 if (path == NULL)
43 goto out;
44
45 for (; level < NILFS_BTREE_LEVEL_MAX; level++) {
46 path[level].bp_bh = NULL;
47 path[level].bp_sib_bh = NULL;
48 path[level].bp_index = 0;
49 path[level].bp_oldreq.bpr_ptr = NILFS_BMAP_INVALID_PTR;
50 path[level].bp_newreq.bpr_ptr = NILFS_BMAP_INVALID_PTR;
51 path[level].bp_op = NULL;
52 }
53
54 out:
55 return path;
56 }
57
58 static void nilfs_btree_free_path(struct nilfs_btree_path *path)
59 {
60 int level = NILFS_BTREE_LEVEL_DATA;
61
62 for (; level < NILFS_BTREE_LEVEL_MAX; level++)
63 brelse(path[level].bp_bh);
64
65 kmem_cache_free(nilfs_btree_path_cache, path);
66 }
67
68 /*
69 * B-tree node operations
70 */
71 static int nilfs_btree_get_new_block(const struct nilfs_bmap *btree,
72 __u64 ptr, struct buffer_head **bhp)
73 {
74 struct address_space *btnc = &NILFS_BMAP_I(btree)->i_btnode_cache;
75 struct buffer_head *bh;
76
77 bh = nilfs_btnode_create_block(btnc, ptr);
78 if (!bh)
79 return -ENOMEM;
80
81 set_buffer_nilfs_volatile(bh);
82 *bhp = bh;
83 return 0;
84 }
85
86 static int nilfs_btree_node_get_flags(const struct nilfs_btree_node *node)
87 {
88 return node->bn_flags;
89 }
90
91 static void
92 nilfs_btree_node_set_flags(struct nilfs_btree_node *node, int flags)
93 {
94 node->bn_flags = flags;
95 }
96
97 static int nilfs_btree_node_root(const struct nilfs_btree_node *node)
98 {
99 return nilfs_btree_node_get_flags(node) & NILFS_BTREE_NODE_ROOT;
100 }
101
102 static int nilfs_btree_node_get_level(const struct nilfs_btree_node *node)
103 {
104 return node->bn_level;
105 }
106
107 static void
108 nilfs_btree_node_set_level(struct nilfs_btree_node *node, int level)
109 {
110 node->bn_level = level;
111 }
112
113 static int nilfs_btree_node_get_nchildren(const struct nilfs_btree_node *node)
114 {
115 return le16_to_cpu(node->bn_nchildren);
116 }
117
118 static void
119 nilfs_btree_node_set_nchildren(struct nilfs_btree_node *node, int nchildren)
120 {
121 node->bn_nchildren = cpu_to_le16(nchildren);
122 }
123
124 static int nilfs_btree_node_size(const struct nilfs_bmap *btree)
125 {
126 return 1 << btree->b_inode->i_blkbits;
127 }
128
129 static int nilfs_btree_nchildren_per_block(const struct nilfs_bmap *btree)
130 {
131 return btree->b_nchildren_per_block;
132 }
133
134 static __le64 *
135 nilfs_btree_node_dkeys(const struct nilfs_btree_node *node)
136 {
137 return (__le64 *)((char *)(node + 1) +
138 (nilfs_btree_node_root(node) ?
139 0 : NILFS_BTREE_NODE_EXTRA_PAD_SIZE));
140 }
141
142 static __le64 *
143 nilfs_btree_node_dptrs(const struct nilfs_btree_node *node, int ncmax)
144 {
145 return (__le64 *)(nilfs_btree_node_dkeys(node) + ncmax);
146 }
147
148 static __u64
149 nilfs_btree_node_get_key(const struct nilfs_btree_node *node, int index)
150 {
151 return le64_to_cpu(*(nilfs_btree_node_dkeys(node) + index));
152 }
153
154 static void
155 nilfs_btree_node_set_key(struct nilfs_btree_node *node, int index, __u64 key)
156 {
157 *(nilfs_btree_node_dkeys(node) + index) = cpu_to_le64(key);
158 }
159
160 static __u64
161 nilfs_btree_node_get_ptr(const struct nilfs_btree_node *node, int index,
162 int ncmax)
163 {
164 return le64_to_cpu(*(nilfs_btree_node_dptrs(node, ncmax) + index));
165 }
166
167 static void
168 nilfs_btree_node_set_ptr(struct nilfs_btree_node *node, int index, __u64 ptr,
169 int ncmax)
170 {
171 *(nilfs_btree_node_dptrs(node, ncmax) + index) = cpu_to_le64(ptr);
172 }
173
174 static void nilfs_btree_node_init(struct nilfs_btree_node *node, int flags,
175 int level, int nchildren, int ncmax,
176 const __u64 *keys, const __u64 *ptrs)
177 {
178 __le64 *dkeys;
179 __le64 *dptrs;
180 int i;
181
182 nilfs_btree_node_set_flags(node, flags);
183 nilfs_btree_node_set_level(node, level);
184 nilfs_btree_node_set_nchildren(node, nchildren);
185
186 dkeys = nilfs_btree_node_dkeys(node);
187 dptrs = nilfs_btree_node_dptrs(node, ncmax);
188 for (i = 0; i < nchildren; i++) {
189 dkeys[i] = cpu_to_le64(keys[i]);
190 dptrs[i] = cpu_to_le64(ptrs[i]);
191 }
192 }
193
194 /* Assume the buffer heads corresponding to left and right are locked. */
195 static void nilfs_btree_node_move_left(struct nilfs_btree_node *left,
196 struct nilfs_btree_node *right,
197 int n, int lncmax, int rncmax)
198 {
199 __le64 *ldkeys, *rdkeys;
200 __le64 *ldptrs, *rdptrs;
201 int lnchildren, rnchildren;
202
203 ldkeys = nilfs_btree_node_dkeys(left);
204 ldptrs = nilfs_btree_node_dptrs(left, lncmax);
205 lnchildren = nilfs_btree_node_get_nchildren(left);
206
207 rdkeys = nilfs_btree_node_dkeys(right);
208 rdptrs = nilfs_btree_node_dptrs(right, rncmax);
209 rnchildren = nilfs_btree_node_get_nchildren(right);
210
211 memcpy(ldkeys + lnchildren, rdkeys, n * sizeof(*rdkeys));
212 memcpy(ldptrs + lnchildren, rdptrs, n * sizeof(*rdptrs));
213 memmove(rdkeys, rdkeys + n, (rnchildren - n) * sizeof(*rdkeys));
214 memmove(rdptrs, rdptrs + n, (rnchildren - n) * sizeof(*rdptrs));
215
216 lnchildren += n;
217 rnchildren -= n;
218 nilfs_btree_node_set_nchildren(left, lnchildren);
219 nilfs_btree_node_set_nchildren(right, rnchildren);
220 }
221
222 /* Assume that the buffer heads corresponding to left and right are locked. */
223 static void nilfs_btree_node_move_right(struct nilfs_btree_node *left,
224 struct nilfs_btree_node *right,
225 int n, int lncmax, int rncmax)
226 {
227 __le64 *ldkeys, *rdkeys;
228 __le64 *ldptrs, *rdptrs;
229 int lnchildren, rnchildren;
230
231 ldkeys = nilfs_btree_node_dkeys(left);
232 ldptrs = nilfs_btree_node_dptrs(left, lncmax);
233 lnchildren = nilfs_btree_node_get_nchildren(left);
234
235 rdkeys = nilfs_btree_node_dkeys(right);
236 rdptrs = nilfs_btree_node_dptrs(right, rncmax);
237 rnchildren = nilfs_btree_node_get_nchildren(right);
238
239 memmove(rdkeys + n, rdkeys, rnchildren * sizeof(*rdkeys));
240 memmove(rdptrs + n, rdptrs, rnchildren * sizeof(*rdptrs));
241 memcpy(rdkeys, ldkeys + lnchildren - n, n * sizeof(*rdkeys));
242 memcpy(rdptrs, ldptrs + lnchildren - n, n * sizeof(*rdptrs));
243
244 lnchildren -= n;
245 rnchildren += n;
246 nilfs_btree_node_set_nchildren(left, lnchildren);
247 nilfs_btree_node_set_nchildren(right, rnchildren);
248 }
249
250 /* Assume that the buffer head corresponding to node is locked. */
251 static void nilfs_btree_node_insert(struct nilfs_btree_node *node, int index,
252 __u64 key, __u64 ptr, int ncmax)
253 {
254 __le64 *dkeys;
255 __le64 *dptrs;
256 int nchildren;
257
258 dkeys = nilfs_btree_node_dkeys(node);
259 dptrs = nilfs_btree_node_dptrs(node, ncmax);
260 nchildren = nilfs_btree_node_get_nchildren(node);
261 if (index < nchildren) {
262 memmove(dkeys + index + 1, dkeys + index,
263 (nchildren - index) * sizeof(*dkeys));
264 memmove(dptrs + index + 1, dptrs + index,
265 (nchildren - index) * sizeof(*dptrs));
266 }
267 dkeys[index] = cpu_to_le64(key);
268 dptrs[index] = cpu_to_le64(ptr);
269 nchildren++;
270 nilfs_btree_node_set_nchildren(node, nchildren);
271 }
272
273 /* Assume that the buffer head corresponding to node is locked. */
274 static void nilfs_btree_node_delete(struct nilfs_btree_node *node, int index,
275 __u64 *keyp, __u64 *ptrp, int ncmax)
276 {
277 __u64 key;
278 __u64 ptr;
279 __le64 *dkeys;
280 __le64 *dptrs;
281 int nchildren;
282
283 dkeys = nilfs_btree_node_dkeys(node);
284 dptrs = nilfs_btree_node_dptrs(node, ncmax);
285 key = le64_to_cpu(dkeys[index]);
286 ptr = le64_to_cpu(dptrs[index]);
287 nchildren = nilfs_btree_node_get_nchildren(node);
288 if (keyp != NULL)
289 *keyp = key;
290 if (ptrp != NULL)
291 *ptrp = ptr;
292
293 if (index < nchildren - 1) {
294 memmove(dkeys + index, dkeys + index + 1,
295 (nchildren - index - 1) * sizeof(*dkeys));
296 memmove(dptrs + index, dptrs + index + 1,
297 (nchildren - index - 1) * sizeof(*dptrs));
298 }
299 nchildren--;
300 nilfs_btree_node_set_nchildren(node, nchildren);
301 }
302
303 static int nilfs_btree_node_lookup(const struct nilfs_btree_node *node,
304 __u64 key, int *indexp)
305 {
306 __u64 nkey;
307 int index, low, high, s;
308
309 /* binary search */
310 low = 0;
311 high = nilfs_btree_node_get_nchildren(node) - 1;
312 index = 0;
313 s = 0;
314 while (low <= high) {
315 index = (low + high) / 2;
316 nkey = nilfs_btree_node_get_key(node, index);
317 if (nkey == key) {
318 s = 0;
319 goto out;
320 } else if (nkey < key) {
321 low = index + 1;
322 s = -1;
323 } else {
324 high = index - 1;
325 s = 1;
326 }
327 }
328
329 /* adjust index */
330 if (nilfs_btree_node_get_level(node) > NILFS_BTREE_LEVEL_NODE_MIN) {
331 if (s > 0 && index > 0)
332 index--;
333 } else if (s < 0)
334 index++;
335
336 out:
337 *indexp = index;
338
339 return s == 0;
340 }
341
342 /**
343 * nilfs_btree_node_broken - verify consistency of btree node
344 * @node: btree node block to be examined
345 * @size: node size (in bytes)
346 * @blocknr: block number
347 *
348 * Return Value: If node is broken, 1 is returned. Otherwise, 0 is returned.
349 */
350 static int nilfs_btree_node_broken(const struct nilfs_btree_node *node,
351 size_t size, sector_t blocknr)
352 {
353 int level, flags, nchildren;
354 int ret = 0;
355
356 level = nilfs_btree_node_get_level(node);
357 flags = nilfs_btree_node_get_flags(node);
358 nchildren = nilfs_btree_node_get_nchildren(node);
359
360 if (unlikely(level < NILFS_BTREE_LEVEL_NODE_MIN ||
361 level >= NILFS_BTREE_LEVEL_MAX ||
362 (flags & NILFS_BTREE_NODE_ROOT) ||
363 nchildren < 0 ||
364 nchildren > NILFS_BTREE_NODE_NCHILDREN_MAX(size))) {
365 printk(KERN_CRIT "NILFS: bad btree node (blocknr=%llu): "
366 "level = %d, flags = 0x%x, nchildren = %d\n",
367 (unsigned long long)blocknr, level, flags, nchildren);
368 ret = 1;
369 }
370 return ret;
371 }
372
373 /**
374 * nilfs_btree_root_broken - verify consistency of btree root node
375 * @node: btree root node to be examined
376 * @ino: inode number
377 *
378 * Return Value: If node is broken, 1 is returned. Otherwise, 0 is returned.
379 */
380 static int nilfs_btree_root_broken(const struct nilfs_btree_node *node,
381 unsigned long ino)
382 {
383 int level, flags, nchildren;
384 int ret = 0;
385
386 level = nilfs_btree_node_get_level(node);
387 flags = nilfs_btree_node_get_flags(node);
388 nchildren = nilfs_btree_node_get_nchildren(node);
389
390 if (unlikely(level < NILFS_BTREE_LEVEL_NODE_MIN ||
391 level > NILFS_BTREE_LEVEL_MAX ||
392 nchildren < 0 ||
393 nchildren > NILFS_BTREE_ROOT_NCHILDREN_MAX)) {
394 pr_crit("NILFS: bad btree root (inode number=%lu): level = %d, flags = 0x%x, nchildren = %d\n",
395 ino, level, flags, nchildren);
396 ret = 1;
397 }
398 return ret;
399 }
400
401 int nilfs_btree_broken_node_block(struct buffer_head *bh)
402 {
403 int ret;
404
405 if (buffer_nilfs_checked(bh))
406 return 0;
407
408 ret = nilfs_btree_node_broken((struct nilfs_btree_node *)bh->b_data,
409 bh->b_size, bh->b_blocknr);
410 if (likely(!ret))
411 set_buffer_nilfs_checked(bh);
412 return ret;
413 }
414
415 static struct nilfs_btree_node *
416 nilfs_btree_get_root(const struct nilfs_bmap *btree)
417 {
418 return (struct nilfs_btree_node *)btree->b_u.u_data;
419 }
420
421 static struct nilfs_btree_node *
422 nilfs_btree_get_nonroot_node(const struct nilfs_btree_path *path, int level)
423 {
424 return (struct nilfs_btree_node *)path[level].bp_bh->b_data;
425 }
426
427 static struct nilfs_btree_node *
428 nilfs_btree_get_sib_node(const struct nilfs_btree_path *path, int level)
429 {
430 return (struct nilfs_btree_node *)path[level].bp_sib_bh->b_data;
431 }
432
433 static int nilfs_btree_height(const struct nilfs_bmap *btree)
434 {
435 return nilfs_btree_node_get_level(nilfs_btree_get_root(btree)) + 1;
436 }
437
438 static struct nilfs_btree_node *
439 nilfs_btree_get_node(const struct nilfs_bmap *btree,
440 const struct nilfs_btree_path *path,
441 int level, int *ncmaxp)
442 {
443 struct nilfs_btree_node *node;
444
445 if (level == nilfs_btree_height(btree) - 1) {
446 node = nilfs_btree_get_root(btree);
447 *ncmaxp = NILFS_BTREE_ROOT_NCHILDREN_MAX;
448 } else {
449 node = nilfs_btree_get_nonroot_node(path, level);
450 *ncmaxp = nilfs_btree_nchildren_per_block(btree);
451 }
452 return node;
453 }
454
455 static int
456 nilfs_btree_bad_node(struct nilfs_btree_node *node, int level)
457 {
458 if (unlikely(nilfs_btree_node_get_level(node) != level)) {
459 dump_stack();
460 printk(KERN_CRIT "NILFS: btree level mismatch: %d != %d\n",
461 nilfs_btree_node_get_level(node), level);
462 return 1;
463 }
464 return 0;
465 }
466
467 struct nilfs_btree_readahead_info {
468 struct nilfs_btree_node *node; /* parent node */
469 int max_ra_blocks; /* max nof blocks to read ahead */
470 int index; /* current index on the parent node */
471 int ncmax; /* nof children in the parent node */
472 };
473
474 static int __nilfs_btree_get_block(const struct nilfs_bmap *btree, __u64 ptr,
475 struct buffer_head **bhp,
476 const struct nilfs_btree_readahead_info *ra)
477 {
478 struct address_space *btnc = &NILFS_BMAP_I(btree)->i_btnode_cache;
479 struct buffer_head *bh, *ra_bh;
480 sector_t submit_ptr = 0;
481 int ret;
482
483 ret = nilfs_btnode_submit_block(btnc, ptr, 0, READ, &bh, &submit_ptr);
484 if (ret) {
485 if (ret != -EEXIST)
486 return ret;
487 goto out_check;
488 }
489
490 if (ra) {
491 int i, n;
492 __u64 ptr2;
493
494 /* read ahead sibling nodes */
495 for (n = ra->max_ra_blocks, i = ra->index + 1;
496 n > 0 && i < ra->ncmax; n--, i++) {
497 ptr2 = nilfs_btree_node_get_ptr(ra->node, i, ra->ncmax);
498
499 ret = nilfs_btnode_submit_block(btnc, ptr2, 0, READA,
500 &ra_bh, &submit_ptr);
501 if (likely(!ret || ret == -EEXIST))
502 brelse(ra_bh);
503 else if (ret != -EBUSY)
504 break;
505 if (!buffer_locked(bh))
506 goto out_no_wait;
507 }
508 }
509
510 wait_on_buffer(bh);
511
512 out_no_wait:
513 if (!buffer_uptodate(bh)) {
514 brelse(bh);
515 return -EIO;
516 }
517
518 out_check:
519 if (nilfs_btree_broken_node_block(bh)) {
520 clear_buffer_uptodate(bh);
521 brelse(bh);
522 return -EINVAL;
523 }
524
525 *bhp = bh;
526 return 0;
527 }
528
529 static int nilfs_btree_get_block(const struct nilfs_bmap *btree, __u64 ptr,
530 struct buffer_head **bhp)
531 {
532 return __nilfs_btree_get_block(btree, ptr, bhp, NULL);
533 }
534
535 static int nilfs_btree_do_lookup(const struct nilfs_bmap *btree,
536 struct nilfs_btree_path *path,
537 __u64 key, __u64 *ptrp, int minlevel,
538 int readahead)
539 {
540 struct nilfs_btree_node *node;
541 struct nilfs_btree_readahead_info p, *ra;
542 __u64 ptr;
543 int level, index, found, ncmax, ret;
544
545 node = nilfs_btree_get_root(btree);
546 level = nilfs_btree_node_get_level(node);
547 if (level < minlevel || nilfs_btree_node_get_nchildren(node) <= 0)
548 return -ENOENT;
549
550 found = nilfs_btree_node_lookup(node, key, &index);
551 ptr = nilfs_btree_node_get_ptr(node, index,
552 NILFS_BTREE_ROOT_NCHILDREN_MAX);
553 path[level].bp_bh = NULL;
554 path[level].bp_index = index;
555
556 ncmax = nilfs_btree_nchildren_per_block(btree);
557
558 while (--level >= minlevel) {
559 ra = NULL;
560 if (level == NILFS_BTREE_LEVEL_NODE_MIN && readahead) {
561 p.node = nilfs_btree_get_node(btree, path, level + 1,
562 &p.ncmax);
563 p.index = index;
564 p.max_ra_blocks = 7;
565 ra = &p;
566 }
567 ret = __nilfs_btree_get_block(btree, ptr, &path[level].bp_bh,
568 ra);
569 if (ret < 0)
570 return ret;
571
572 node = nilfs_btree_get_nonroot_node(path, level);
573 if (nilfs_btree_bad_node(node, level))
574 return -EINVAL;
575 if (!found)
576 found = nilfs_btree_node_lookup(node, key, &index);
577 else
578 index = 0;
579 if (index < ncmax) {
580 ptr = nilfs_btree_node_get_ptr(node, index, ncmax);
581 } else {
582 WARN_ON(found || level != NILFS_BTREE_LEVEL_NODE_MIN);
583 /* insert */
584 ptr = NILFS_BMAP_INVALID_PTR;
585 }
586 path[level].bp_index = index;
587 }
588 if (!found)
589 return -ENOENT;
590
591 if (ptrp != NULL)
592 *ptrp = ptr;
593
594 return 0;
595 }
596
597 static int nilfs_btree_do_lookup_last(const struct nilfs_bmap *btree,
598 struct nilfs_btree_path *path,
599 __u64 *keyp, __u64 *ptrp)
600 {
601 struct nilfs_btree_node *node;
602 __u64 ptr;
603 int index, level, ncmax, ret;
604
605 node = nilfs_btree_get_root(btree);
606 index = nilfs_btree_node_get_nchildren(node) - 1;
607 if (index < 0)
608 return -ENOENT;
609 level = nilfs_btree_node_get_level(node);
610 ptr = nilfs_btree_node_get_ptr(node, index,
611 NILFS_BTREE_ROOT_NCHILDREN_MAX);
612 path[level].bp_bh = NULL;
613 path[level].bp_index = index;
614 ncmax = nilfs_btree_nchildren_per_block(btree);
615
616 for (level--; level > 0; level--) {
617 ret = nilfs_btree_get_block(btree, ptr, &path[level].bp_bh);
618 if (ret < 0)
619 return ret;
620 node = nilfs_btree_get_nonroot_node(path, level);
621 if (nilfs_btree_bad_node(node, level))
622 return -EINVAL;
623 index = nilfs_btree_node_get_nchildren(node) - 1;
624 ptr = nilfs_btree_node_get_ptr(node, index, ncmax);
625 path[level].bp_index = index;
626 }
627
628 if (keyp != NULL)
629 *keyp = nilfs_btree_node_get_key(node, index);
630 if (ptrp != NULL)
631 *ptrp = ptr;
632
633 return 0;
634 }
635
636 static int nilfs_btree_lookup(const struct nilfs_bmap *btree,
637 __u64 key, int level, __u64 *ptrp)
638 {
639 struct nilfs_btree_path *path;
640 int ret;
641
642 path = nilfs_btree_alloc_path();
643 if (path == NULL)
644 return -ENOMEM;
645
646 ret = nilfs_btree_do_lookup(btree, path, key, ptrp, level, 0);
647
648 nilfs_btree_free_path(path);
649
650 return ret;
651 }
652
653 static int nilfs_btree_lookup_contig(const struct nilfs_bmap *btree,
654 __u64 key, __u64 *ptrp, unsigned maxblocks)
655 {
656 struct nilfs_btree_path *path;
657 struct nilfs_btree_node *node;
658 struct inode *dat = NULL;
659 __u64 ptr, ptr2;
660 sector_t blocknr;
661 int level = NILFS_BTREE_LEVEL_NODE_MIN;
662 int ret, cnt, index, maxlevel, ncmax;
663 struct nilfs_btree_readahead_info p;
664
665 path = nilfs_btree_alloc_path();
666 if (path == NULL)
667 return -ENOMEM;
668
669 ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level, 1);
670 if (ret < 0)
671 goto out;
672
673 if (NILFS_BMAP_USE_VBN(btree)) {
674 dat = nilfs_bmap_get_dat(btree);
675 ret = nilfs_dat_translate(dat, ptr, &blocknr);
676 if (ret < 0)
677 goto out;
678 ptr = blocknr;
679 }
680 cnt = 1;
681 if (cnt == maxblocks)
682 goto end;
683
684 maxlevel = nilfs_btree_height(btree) - 1;
685 node = nilfs_btree_get_node(btree, path, level, &ncmax);
686 index = path[level].bp_index + 1;
687 for (;;) {
688 while (index < nilfs_btree_node_get_nchildren(node)) {
689 if (nilfs_btree_node_get_key(node, index) !=
690 key + cnt)
691 goto end;
692 ptr2 = nilfs_btree_node_get_ptr(node, index, ncmax);
693 if (dat) {
694 ret = nilfs_dat_translate(dat, ptr2, &blocknr);
695 if (ret < 0)
696 goto out;
697 ptr2 = blocknr;
698 }
699 if (ptr2 != ptr + cnt || ++cnt == maxblocks)
700 goto end;
701 index++;
702 continue;
703 }
704 if (level == maxlevel)
705 break;
706
707 /* look-up right sibling node */
708 p.node = nilfs_btree_get_node(btree, path, level + 1, &p.ncmax);
709 p.index = path[level + 1].bp_index + 1;
710 p.max_ra_blocks = 7;
711 if (p.index >= nilfs_btree_node_get_nchildren(p.node) ||
712 nilfs_btree_node_get_key(p.node, p.index) != key + cnt)
713 break;
714 ptr2 = nilfs_btree_node_get_ptr(p.node, p.index, p.ncmax);
715 path[level + 1].bp_index = p.index;
716
717 brelse(path[level].bp_bh);
718 path[level].bp_bh = NULL;
719
720 ret = __nilfs_btree_get_block(btree, ptr2, &path[level].bp_bh,
721 &p);
722 if (ret < 0)
723 goto out;
724 node = nilfs_btree_get_nonroot_node(path, level);
725 ncmax = nilfs_btree_nchildren_per_block(btree);
726 index = 0;
727 path[level].bp_index = index;
728 }
729 end:
730 *ptrp = ptr;
731 ret = cnt;
732 out:
733 nilfs_btree_free_path(path);
734 return ret;
735 }
736
737 static void nilfs_btree_promote_key(struct nilfs_bmap *btree,
738 struct nilfs_btree_path *path,
739 int level, __u64 key)
740 {
741 if (level < nilfs_btree_height(btree) - 1) {
742 do {
743 nilfs_btree_node_set_key(
744 nilfs_btree_get_nonroot_node(path, level),
745 path[level].bp_index, key);
746 if (!buffer_dirty(path[level].bp_bh))
747 mark_buffer_dirty(path[level].bp_bh);
748 } while ((path[level].bp_index == 0) &&
749 (++level < nilfs_btree_height(btree) - 1));
750 }
751
752 /* root */
753 if (level == nilfs_btree_height(btree) - 1) {
754 nilfs_btree_node_set_key(nilfs_btree_get_root(btree),
755 path[level].bp_index, key);
756 }
757 }
758
759 static void nilfs_btree_do_insert(struct nilfs_bmap *btree,
760 struct nilfs_btree_path *path,
761 int level, __u64 *keyp, __u64 *ptrp)
762 {
763 struct nilfs_btree_node *node;
764 int ncblk;
765
766 if (level < nilfs_btree_height(btree) - 1) {
767 node = nilfs_btree_get_nonroot_node(path, level);
768 ncblk = nilfs_btree_nchildren_per_block(btree);
769 nilfs_btree_node_insert(node, path[level].bp_index,
770 *keyp, *ptrp, ncblk);
771 if (!buffer_dirty(path[level].bp_bh))
772 mark_buffer_dirty(path[level].bp_bh);
773
774 if (path[level].bp_index == 0)
775 nilfs_btree_promote_key(btree, path, level + 1,
776 nilfs_btree_node_get_key(node,
777 0));
778 } else {
779 node = nilfs_btree_get_root(btree);
780 nilfs_btree_node_insert(node, path[level].bp_index,
781 *keyp, *ptrp,
782 NILFS_BTREE_ROOT_NCHILDREN_MAX);
783 }
784 }
785
786 static void nilfs_btree_carry_left(struct nilfs_bmap *btree,
787 struct nilfs_btree_path *path,
788 int level, __u64 *keyp, __u64 *ptrp)
789 {
790 struct nilfs_btree_node *node, *left;
791 int nchildren, lnchildren, n, move, ncblk;
792
793 node = nilfs_btree_get_nonroot_node(path, level);
794 left = nilfs_btree_get_sib_node(path, level);
795 nchildren = nilfs_btree_node_get_nchildren(node);
796 lnchildren = nilfs_btree_node_get_nchildren(left);
797 ncblk = nilfs_btree_nchildren_per_block(btree);
798 move = 0;
799
800 n = (nchildren + lnchildren + 1) / 2 - lnchildren;
801 if (n > path[level].bp_index) {
802 /* move insert point */
803 n--;
804 move = 1;
805 }
806
807 nilfs_btree_node_move_left(left, node, n, ncblk, ncblk);
808
809 if (!buffer_dirty(path[level].bp_bh))
810 mark_buffer_dirty(path[level].bp_bh);
811 if (!buffer_dirty(path[level].bp_sib_bh))
812 mark_buffer_dirty(path[level].bp_sib_bh);
813
814 nilfs_btree_promote_key(btree, path, level + 1,
815 nilfs_btree_node_get_key(node, 0));
816
817 if (move) {
818 brelse(path[level].bp_bh);
819 path[level].bp_bh = path[level].bp_sib_bh;
820 path[level].bp_sib_bh = NULL;
821 path[level].bp_index += lnchildren;
822 path[level + 1].bp_index--;
823 } else {
824 brelse(path[level].bp_sib_bh);
825 path[level].bp_sib_bh = NULL;
826 path[level].bp_index -= n;
827 }
828
829 nilfs_btree_do_insert(btree, path, level, keyp, ptrp);
830 }
831
832 static void nilfs_btree_carry_right(struct nilfs_bmap *btree,
833 struct nilfs_btree_path *path,
834 int level, __u64 *keyp, __u64 *ptrp)
835 {
836 struct nilfs_btree_node *node, *right;
837 int nchildren, rnchildren, n, move, ncblk;
838
839 node = nilfs_btree_get_nonroot_node(path, level);
840 right = nilfs_btree_get_sib_node(path, level);
841 nchildren = nilfs_btree_node_get_nchildren(node);
842 rnchildren = nilfs_btree_node_get_nchildren(right);
843 ncblk = nilfs_btree_nchildren_per_block(btree);
844 move = 0;
845
846 n = (nchildren + rnchildren + 1) / 2 - rnchildren;
847 if (n > nchildren - path[level].bp_index) {
848 /* move insert point */
849 n--;
850 move = 1;
851 }
852
853 nilfs_btree_node_move_right(node, right, n, ncblk, ncblk);
854
855 if (!buffer_dirty(path[level].bp_bh))
856 mark_buffer_dirty(path[level].bp_bh);
857 if (!buffer_dirty(path[level].bp_sib_bh))
858 mark_buffer_dirty(path[level].bp_sib_bh);
859
860 path[level + 1].bp_index++;
861 nilfs_btree_promote_key(btree, path, level + 1,
862 nilfs_btree_node_get_key(right, 0));
863 path[level + 1].bp_index--;
864
865 if (move) {
866 brelse(path[level].bp_bh);
867 path[level].bp_bh = path[level].bp_sib_bh;
868 path[level].bp_sib_bh = NULL;
869 path[level].bp_index -= nilfs_btree_node_get_nchildren(node);
870 path[level + 1].bp_index++;
871 } else {
872 brelse(path[level].bp_sib_bh);
873 path[level].bp_sib_bh = NULL;
874 }
875
876 nilfs_btree_do_insert(btree, path, level, keyp, ptrp);
877 }
878
879 static void nilfs_btree_split(struct nilfs_bmap *btree,
880 struct nilfs_btree_path *path,
881 int level, __u64 *keyp, __u64 *ptrp)
882 {
883 struct nilfs_btree_node *node, *right;
884 __u64 newkey;
885 __u64 newptr;
886 int nchildren, n, move, ncblk;
887
888 node = nilfs_btree_get_nonroot_node(path, level);
889 right = nilfs_btree_get_sib_node(path, level);
890 nchildren = nilfs_btree_node_get_nchildren(node);
891 ncblk = nilfs_btree_nchildren_per_block(btree);
892 move = 0;
893
894 n = (nchildren + 1) / 2;
895 if (n > nchildren - path[level].bp_index) {
896 n--;
897 move = 1;
898 }
899
900 nilfs_btree_node_move_right(node, right, n, ncblk, ncblk);
901
902 if (!buffer_dirty(path[level].bp_bh))
903 mark_buffer_dirty(path[level].bp_bh);
904 if (!buffer_dirty(path[level].bp_sib_bh))
905 mark_buffer_dirty(path[level].bp_sib_bh);
906
907 newkey = nilfs_btree_node_get_key(right, 0);
908 newptr = path[level].bp_newreq.bpr_ptr;
909
910 if (move) {
911 path[level].bp_index -= nilfs_btree_node_get_nchildren(node);
912 nilfs_btree_node_insert(right, path[level].bp_index,
913 *keyp, *ptrp, ncblk);
914
915 *keyp = nilfs_btree_node_get_key(right, 0);
916 *ptrp = path[level].bp_newreq.bpr_ptr;
917
918 brelse(path[level].bp_bh);
919 path[level].bp_bh = path[level].bp_sib_bh;
920 path[level].bp_sib_bh = NULL;
921 } else {
922 nilfs_btree_do_insert(btree, path, level, keyp, ptrp);
923
924 *keyp = nilfs_btree_node_get_key(right, 0);
925 *ptrp = path[level].bp_newreq.bpr_ptr;
926
927 brelse(path[level].bp_sib_bh);
928 path[level].bp_sib_bh = NULL;
929 }
930
931 path[level + 1].bp_index++;
932 }
933
934 static void nilfs_btree_grow(struct nilfs_bmap *btree,
935 struct nilfs_btree_path *path,
936 int level, __u64 *keyp, __u64 *ptrp)
937 {
938 struct nilfs_btree_node *root, *child;
939 int n, ncblk;
940
941 root = nilfs_btree_get_root(btree);
942 child = nilfs_btree_get_sib_node(path, level);
943 ncblk = nilfs_btree_nchildren_per_block(btree);
944
945 n = nilfs_btree_node_get_nchildren(root);
946
947 nilfs_btree_node_move_right(root, child, n,
948 NILFS_BTREE_ROOT_NCHILDREN_MAX, ncblk);
949 nilfs_btree_node_set_level(root, level + 1);
950
951 if (!buffer_dirty(path[level].bp_sib_bh))
952 mark_buffer_dirty(path[level].bp_sib_bh);
953
954 path[level].bp_bh = path[level].bp_sib_bh;
955 path[level].bp_sib_bh = NULL;
956
957 nilfs_btree_do_insert(btree, path, level, keyp, ptrp);
958
959 *keyp = nilfs_btree_node_get_key(child, 0);
960 *ptrp = path[level].bp_newreq.bpr_ptr;
961 }
962
963 static __u64 nilfs_btree_find_near(const struct nilfs_bmap *btree,
964 const struct nilfs_btree_path *path)
965 {
966 struct nilfs_btree_node *node;
967 int level, ncmax;
968
969 if (path == NULL)
970 return NILFS_BMAP_INVALID_PTR;
971
972 /* left sibling */
973 level = NILFS_BTREE_LEVEL_NODE_MIN;
974 if (path[level].bp_index > 0) {
975 node = nilfs_btree_get_node(btree, path, level, &ncmax);
976 return nilfs_btree_node_get_ptr(node,
977 path[level].bp_index - 1,
978 ncmax);
979 }
980
981 /* parent */
982 level = NILFS_BTREE_LEVEL_NODE_MIN + 1;
983 if (level <= nilfs_btree_height(btree) - 1) {
984 node = nilfs_btree_get_node(btree, path, level, &ncmax);
985 return nilfs_btree_node_get_ptr(node, path[level].bp_index,
986 ncmax);
987 }
988
989 return NILFS_BMAP_INVALID_PTR;
990 }
991
992 static __u64 nilfs_btree_find_target_v(const struct nilfs_bmap *btree,
993 const struct nilfs_btree_path *path,
994 __u64 key)
995 {
996 __u64 ptr;
997
998 ptr = nilfs_bmap_find_target_seq(btree, key);
999 if (ptr != NILFS_BMAP_INVALID_PTR)
1000 /* sequential access */
1001 return ptr;
1002 else {
1003 ptr = nilfs_btree_find_near(btree, path);
1004 if (ptr != NILFS_BMAP_INVALID_PTR)
1005 /* near */
1006 return ptr;
1007 }
1008 /* block group */
1009 return nilfs_bmap_find_target_in_group(btree);
1010 }
1011
1012 static int nilfs_btree_prepare_insert(struct nilfs_bmap *btree,
1013 struct nilfs_btree_path *path,
1014 int *levelp, __u64 key, __u64 ptr,
1015 struct nilfs_bmap_stats *stats)
1016 {
1017 struct buffer_head *bh;
1018 struct nilfs_btree_node *node, *parent, *sib;
1019 __u64 sibptr;
1020 int pindex, level, ncmax, ncblk, ret;
1021 struct inode *dat = NULL;
1022
1023 stats->bs_nblocks = 0;
1024 level = NILFS_BTREE_LEVEL_DATA;
1025
1026 /* allocate a new ptr for data block */
1027 if (NILFS_BMAP_USE_VBN(btree)) {
1028 path[level].bp_newreq.bpr_ptr =
1029 nilfs_btree_find_target_v(btree, path, key);
1030 dat = nilfs_bmap_get_dat(btree);
1031 }
1032
1033 ret = nilfs_bmap_prepare_alloc_ptr(btree, &path[level].bp_newreq, dat);
1034 if (ret < 0)
1035 goto err_out_data;
1036
1037 ncblk = nilfs_btree_nchildren_per_block(btree);
1038
1039 for (level = NILFS_BTREE_LEVEL_NODE_MIN;
1040 level < nilfs_btree_height(btree) - 1;
1041 level++) {
1042 node = nilfs_btree_get_nonroot_node(path, level);
1043 if (nilfs_btree_node_get_nchildren(node) < ncblk) {
1044 path[level].bp_op = nilfs_btree_do_insert;
1045 stats->bs_nblocks++;
1046 goto out;
1047 }
1048
1049 parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax);
1050 pindex = path[level + 1].bp_index;
1051
1052 /* left sibling */
1053 if (pindex > 0) {
1054 sibptr = nilfs_btree_node_get_ptr(parent, pindex - 1,
1055 ncmax);
1056 ret = nilfs_btree_get_block(btree, sibptr, &bh);
1057 if (ret < 0)
1058 goto err_out_child_node;
1059 sib = (struct nilfs_btree_node *)bh->b_data;
1060 if (nilfs_btree_node_get_nchildren(sib) < ncblk) {
1061 path[level].bp_sib_bh = bh;
1062 path[level].bp_op = nilfs_btree_carry_left;
1063 stats->bs_nblocks++;
1064 goto out;
1065 } else {
1066 brelse(bh);
1067 }
1068 }
1069
1070 /* right sibling */
1071 if (pindex < nilfs_btree_node_get_nchildren(parent) - 1) {
1072 sibptr = nilfs_btree_node_get_ptr(parent, pindex + 1,
1073 ncmax);
1074 ret = nilfs_btree_get_block(btree, sibptr, &bh);
1075 if (ret < 0)
1076 goto err_out_child_node;
1077 sib = (struct nilfs_btree_node *)bh->b_data;
1078 if (nilfs_btree_node_get_nchildren(sib) < ncblk) {
1079 path[level].bp_sib_bh = bh;
1080 path[level].bp_op = nilfs_btree_carry_right;
1081 stats->bs_nblocks++;
1082 goto out;
1083 } else {
1084 brelse(bh);
1085 }
1086 }
1087
1088 /* split */
1089 path[level].bp_newreq.bpr_ptr =
1090 path[level - 1].bp_newreq.bpr_ptr + 1;
1091 ret = nilfs_bmap_prepare_alloc_ptr(btree,
1092 &path[level].bp_newreq, dat);
1093 if (ret < 0)
1094 goto err_out_child_node;
1095 ret = nilfs_btree_get_new_block(btree,
1096 path[level].bp_newreq.bpr_ptr,
1097 &bh);
1098 if (ret < 0)
1099 goto err_out_curr_node;
1100
1101 stats->bs_nblocks++;
1102
1103 sib = (struct nilfs_btree_node *)bh->b_data;
1104 nilfs_btree_node_init(sib, 0, level, 0, ncblk, NULL, NULL);
1105 path[level].bp_sib_bh = bh;
1106 path[level].bp_op = nilfs_btree_split;
1107 }
1108
1109 /* root */
1110 node = nilfs_btree_get_root(btree);
1111 if (nilfs_btree_node_get_nchildren(node) <
1112 NILFS_BTREE_ROOT_NCHILDREN_MAX) {
1113 path[level].bp_op = nilfs_btree_do_insert;
1114 stats->bs_nblocks++;
1115 goto out;
1116 }
1117
1118 /* grow */
1119 path[level].bp_newreq.bpr_ptr = path[level - 1].bp_newreq.bpr_ptr + 1;
1120 ret = nilfs_bmap_prepare_alloc_ptr(btree, &path[level].bp_newreq, dat);
1121 if (ret < 0)
1122 goto err_out_child_node;
1123 ret = nilfs_btree_get_new_block(btree, path[level].bp_newreq.bpr_ptr,
1124 &bh);
1125 if (ret < 0)
1126 goto err_out_curr_node;
1127
1128 nilfs_btree_node_init((struct nilfs_btree_node *)bh->b_data,
1129 0, level, 0, ncblk, NULL, NULL);
1130 path[level].bp_sib_bh = bh;
1131 path[level].bp_op = nilfs_btree_grow;
1132
1133 level++;
1134 path[level].bp_op = nilfs_btree_do_insert;
1135
1136 /* a newly-created node block and a data block are added */
1137 stats->bs_nblocks += 2;
1138
1139 /* success */
1140 out:
1141 *levelp = level;
1142 return ret;
1143
1144 /* error */
1145 err_out_curr_node:
1146 nilfs_bmap_abort_alloc_ptr(btree, &path[level].bp_newreq, dat);
1147 err_out_child_node:
1148 for (level--; level > NILFS_BTREE_LEVEL_DATA; level--) {
1149 nilfs_btnode_delete(path[level].bp_sib_bh);
1150 nilfs_bmap_abort_alloc_ptr(btree, &path[level].bp_newreq, dat);
1151
1152 }
1153
1154 nilfs_bmap_abort_alloc_ptr(btree, &path[level].bp_newreq, dat);
1155 err_out_data:
1156 *levelp = level;
1157 stats->bs_nblocks = 0;
1158 return ret;
1159 }
1160
1161 static void nilfs_btree_commit_insert(struct nilfs_bmap *btree,
1162 struct nilfs_btree_path *path,
1163 int maxlevel, __u64 key, __u64 ptr)
1164 {
1165 struct inode *dat = NULL;
1166 int level;
1167
1168 set_buffer_nilfs_volatile((struct buffer_head *)((unsigned long)ptr));
1169 ptr = path[NILFS_BTREE_LEVEL_DATA].bp_newreq.bpr_ptr;
1170 if (NILFS_BMAP_USE_VBN(btree)) {
1171 nilfs_bmap_set_target_v(btree, key, ptr);
1172 dat = nilfs_bmap_get_dat(btree);
1173 }
1174
1175 for (level = NILFS_BTREE_LEVEL_NODE_MIN; level <= maxlevel; level++) {
1176 nilfs_bmap_commit_alloc_ptr(btree,
1177 &path[level - 1].bp_newreq, dat);
1178 path[level].bp_op(btree, path, level, &key, &ptr);
1179 }
1180
1181 if (!nilfs_bmap_dirty(btree))
1182 nilfs_bmap_set_dirty(btree);
1183 }
1184
1185 static int nilfs_btree_insert(struct nilfs_bmap *btree, __u64 key, __u64 ptr)
1186 {
1187 struct nilfs_btree_path *path;
1188 struct nilfs_bmap_stats stats;
1189 int level, ret;
1190
1191 path = nilfs_btree_alloc_path();
1192 if (path == NULL)
1193 return -ENOMEM;
1194
1195 ret = nilfs_btree_do_lookup(btree, path, key, NULL,
1196 NILFS_BTREE_LEVEL_NODE_MIN, 0);
1197 if (ret != -ENOENT) {
1198 if (ret == 0)
1199 ret = -EEXIST;
1200 goto out;
1201 }
1202
1203 ret = nilfs_btree_prepare_insert(btree, path, &level, key, ptr, &stats);
1204 if (ret < 0)
1205 goto out;
1206 nilfs_btree_commit_insert(btree, path, level, key, ptr);
1207 nilfs_inode_add_blocks(btree->b_inode, stats.bs_nblocks);
1208
1209 out:
1210 nilfs_btree_free_path(path);
1211 return ret;
1212 }
1213
1214 static void nilfs_btree_do_delete(struct nilfs_bmap *btree,
1215 struct nilfs_btree_path *path,
1216 int level, __u64 *keyp, __u64 *ptrp)
1217 {
1218 struct nilfs_btree_node *node;
1219 int ncblk;
1220
1221 if (level < nilfs_btree_height(btree) - 1) {
1222 node = nilfs_btree_get_nonroot_node(path, level);
1223 ncblk = nilfs_btree_nchildren_per_block(btree);
1224 nilfs_btree_node_delete(node, path[level].bp_index,
1225 keyp, ptrp, ncblk);
1226 if (!buffer_dirty(path[level].bp_bh))
1227 mark_buffer_dirty(path[level].bp_bh);
1228 if (path[level].bp_index == 0)
1229 nilfs_btree_promote_key(btree, path, level + 1,
1230 nilfs_btree_node_get_key(node, 0));
1231 } else {
1232 node = nilfs_btree_get_root(btree);
1233 nilfs_btree_node_delete(node, path[level].bp_index,
1234 keyp, ptrp,
1235 NILFS_BTREE_ROOT_NCHILDREN_MAX);
1236 }
1237 }
1238
1239 static void nilfs_btree_borrow_left(struct nilfs_bmap *btree,
1240 struct nilfs_btree_path *path,
1241 int level, __u64 *keyp, __u64 *ptrp)
1242 {
1243 struct nilfs_btree_node *node, *left;
1244 int nchildren, lnchildren, n, ncblk;
1245
1246 nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
1247
1248 node = nilfs_btree_get_nonroot_node(path, level);
1249 left = nilfs_btree_get_sib_node(path, level);
1250 nchildren = nilfs_btree_node_get_nchildren(node);
1251 lnchildren = nilfs_btree_node_get_nchildren(left);
1252 ncblk = nilfs_btree_nchildren_per_block(btree);
1253
1254 n = (nchildren + lnchildren) / 2 - nchildren;
1255
1256 nilfs_btree_node_move_right(left, node, n, ncblk, ncblk);
1257
1258 if (!buffer_dirty(path[level].bp_bh))
1259 mark_buffer_dirty(path[level].bp_bh);
1260 if (!buffer_dirty(path[level].bp_sib_bh))
1261 mark_buffer_dirty(path[level].bp_sib_bh);
1262
1263 nilfs_btree_promote_key(btree, path, level + 1,
1264 nilfs_btree_node_get_key(node, 0));
1265
1266 brelse(path[level].bp_sib_bh);
1267 path[level].bp_sib_bh = NULL;
1268 path[level].bp_index += n;
1269 }
1270
1271 static void nilfs_btree_borrow_right(struct nilfs_bmap *btree,
1272 struct nilfs_btree_path *path,
1273 int level, __u64 *keyp, __u64 *ptrp)
1274 {
1275 struct nilfs_btree_node *node, *right;
1276 int nchildren, rnchildren, n, ncblk;
1277
1278 nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
1279
1280 node = nilfs_btree_get_nonroot_node(path, level);
1281 right = nilfs_btree_get_sib_node(path, level);
1282 nchildren = nilfs_btree_node_get_nchildren(node);
1283 rnchildren = nilfs_btree_node_get_nchildren(right);
1284 ncblk = nilfs_btree_nchildren_per_block(btree);
1285
1286 n = (nchildren + rnchildren) / 2 - nchildren;
1287
1288 nilfs_btree_node_move_left(node, right, n, ncblk, ncblk);
1289
1290 if (!buffer_dirty(path[level].bp_bh))
1291 mark_buffer_dirty(path[level].bp_bh);
1292 if (!buffer_dirty(path[level].bp_sib_bh))
1293 mark_buffer_dirty(path[level].bp_sib_bh);
1294
1295 path[level + 1].bp_index++;
1296 nilfs_btree_promote_key(btree, path, level + 1,
1297 nilfs_btree_node_get_key(right, 0));
1298 path[level + 1].bp_index--;
1299
1300 brelse(path[level].bp_sib_bh);
1301 path[level].bp_sib_bh = NULL;
1302 }
1303
1304 static void nilfs_btree_concat_left(struct nilfs_bmap *btree,
1305 struct nilfs_btree_path *path,
1306 int level, __u64 *keyp, __u64 *ptrp)
1307 {
1308 struct nilfs_btree_node *node, *left;
1309 int n, ncblk;
1310
1311 nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
1312
1313 node = nilfs_btree_get_nonroot_node(path, level);
1314 left = nilfs_btree_get_sib_node(path, level);
1315 ncblk = nilfs_btree_nchildren_per_block(btree);
1316
1317 n = nilfs_btree_node_get_nchildren(node);
1318
1319 nilfs_btree_node_move_left(left, node, n, ncblk, ncblk);
1320
1321 if (!buffer_dirty(path[level].bp_sib_bh))
1322 mark_buffer_dirty(path[level].bp_sib_bh);
1323
1324 nilfs_btnode_delete(path[level].bp_bh);
1325 path[level].bp_bh = path[level].bp_sib_bh;
1326 path[level].bp_sib_bh = NULL;
1327 path[level].bp_index += nilfs_btree_node_get_nchildren(left);
1328 }
1329
1330 static void nilfs_btree_concat_right(struct nilfs_bmap *btree,
1331 struct nilfs_btree_path *path,
1332 int level, __u64 *keyp, __u64 *ptrp)
1333 {
1334 struct nilfs_btree_node *node, *right;
1335 int n, ncblk;
1336
1337 nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
1338
1339 node = nilfs_btree_get_nonroot_node(path, level);
1340 right = nilfs_btree_get_sib_node(path, level);
1341 ncblk = nilfs_btree_nchildren_per_block(btree);
1342
1343 n = nilfs_btree_node_get_nchildren(right);
1344
1345 nilfs_btree_node_move_left(node, right, n, ncblk, ncblk);
1346
1347 if (!buffer_dirty(path[level].bp_bh))
1348 mark_buffer_dirty(path[level].bp_bh);
1349
1350 nilfs_btnode_delete(path[level].bp_sib_bh);
1351 path[level].bp_sib_bh = NULL;
1352 path[level + 1].bp_index++;
1353 }
1354
1355 static void nilfs_btree_shrink(struct nilfs_bmap *btree,
1356 struct nilfs_btree_path *path,
1357 int level, __u64 *keyp, __u64 *ptrp)
1358 {
1359 struct nilfs_btree_node *root, *child;
1360 int n, ncblk;
1361
1362 nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
1363
1364 root = nilfs_btree_get_root(btree);
1365 child = nilfs_btree_get_nonroot_node(path, level);
1366 ncblk = nilfs_btree_nchildren_per_block(btree);
1367
1368 nilfs_btree_node_delete(root, 0, NULL, NULL,
1369 NILFS_BTREE_ROOT_NCHILDREN_MAX);
1370 nilfs_btree_node_set_level(root, level);
1371 n = nilfs_btree_node_get_nchildren(child);
1372 nilfs_btree_node_move_left(root, child, n,
1373 NILFS_BTREE_ROOT_NCHILDREN_MAX, ncblk);
1374
1375 nilfs_btnode_delete(path[level].bp_bh);
1376 path[level].bp_bh = NULL;
1377 }
1378
1379 static void nilfs_btree_nop(struct nilfs_bmap *btree,
1380 struct nilfs_btree_path *path,
1381 int level, __u64 *keyp, __u64 *ptrp)
1382 {
1383 }
1384
1385 static int nilfs_btree_prepare_delete(struct nilfs_bmap *btree,
1386 struct nilfs_btree_path *path,
1387 int *levelp,
1388 struct nilfs_bmap_stats *stats,
1389 struct inode *dat)
1390 {
1391 struct buffer_head *bh;
1392 struct nilfs_btree_node *node, *parent, *sib;
1393 __u64 sibptr;
1394 int pindex, dindex, level, ncmin, ncmax, ncblk, ret;
1395
1396 ret = 0;
1397 stats->bs_nblocks = 0;
1398 ncmin = NILFS_BTREE_NODE_NCHILDREN_MIN(nilfs_btree_node_size(btree));
1399 ncblk = nilfs_btree_nchildren_per_block(btree);
1400
1401 for (level = NILFS_BTREE_LEVEL_NODE_MIN, dindex = path[level].bp_index;
1402 level < nilfs_btree_height(btree) - 1;
1403 level++) {
1404 node = nilfs_btree_get_nonroot_node(path, level);
1405 path[level].bp_oldreq.bpr_ptr =
1406 nilfs_btree_node_get_ptr(node, dindex, ncblk);
1407 ret = nilfs_bmap_prepare_end_ptr(btree,
1408 &path[level].bp_oldreq, dat);
1409 if (ret < 0)
1410 goto err_out_child_node;
1411
1412 if (nilfs_btree_node_get_nchildren(node) > ncmin) {
1413 path[level].bp_op = nilfs_btree_do_delete;
1414 stats->bs_nblocks++;
1415 goto out;
1416 }
1417
1418 parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax);
1419 pindex = path[level + 1].bp_index;
1420 dindex = pindex;
1421
1422 if (pindex > 0) {
1423 /* left sibling */
1424 sibptr = nilfs_btree_node_get_ptr(parent, pindex - 1,
1425 ncmax);
1426 ret = nilfs_btree_get_block(btree, sibptr, &bh);
1427 if (ret < 0)
1428 goto err_out_curr_node;
1429 sib = (struct nilfs_btree_node *)bh->b_data;
1430 if (nilfs_btree_node_get_nchildren(sib) > ncmin) {
1431 path[level].bp_sib_bh = bh;
1432 path[level].bp_op = nilfs_btree_borrow_left;
1433 stats->bs_nblocks++;
1434 goto out;
1435 } else {
1436 path[level].bp_sib_bh = bh;
1437 path[level].bp_op = nilfs_btree_concat_left;
1438 stats->bs_nblocks++;
1439 /* continue; */
1440 }
1441 } else if (pindex <
1442 nilfs_btree_node_get_nchildren(parent) - 1) {
1443 /* right sibling */
1444 sibptr = nilfs_btree_node_get_ptr(parent, pindex + 1,
1445 ncmax);
1446 ret = nilfs_btree_get_block(btree, sibptr, &bh);
1447 if (ret < 0)
1448 goto err_out_curr_node;
1449 sib = (struct nilfs_btree_node *)bh->b_data;
1450 if (nilfs_btree_node_get_nchildren(sib) > ncmin) {
1451 path[level].bp_sib_bh = bh;
1452 path[level].bp_op = nilfs_btree_borrow_right;
1453 stats->bs_nblocks++;
1454 goto out;
1455 } else {
1456 path[level].bp_sib_bh = bh;
1457 path[level].bp_op = nilfs_btree_concat_right;
1458 stats->bs_nblocks++;
1459 /*
1460 * When merging right sibling node
1461 * into the current node, pointer to
1462 * the right sibling node must be
1463 * terminated instead. The adjustment
1464 * below is required for that.
1465 */
1466 dindex = pindex + 1;
1467 /* continue; */
1468 }
1469 } else {
1470 /* no siblings */
1471 /* the only child of the root node */
1472 WARN_ON(level != nilfs_btree_height(btree) - 2);
1473 if (nilfs_btree_node_get_nchildren(node) - 1 <=
1474 NILFS_BTREE_ROOT_NCHILDREN_MAX) {
1475 path[level].bp_op = nilfs_btree_shrink;
1476 stats->bs_nblocks += 2;
1477 level++;
1478 path[level].bp_op = nilfs_btree_nop;
1479 goto shrink_root_child;
1480 } else {
1481 path[level].bp_op = nilfs_btree_do_delete;
1482 stats->bs_nblocks++;
1483 goto out;
1484 }
1485 }
1486 }
1487
1488 /* child of the root node is deleted */
1489 path[level].bp_op = nilfs_btree_do_delete;
1490 stats->bs_nblocks++;
1491
1492 shrink_root_child:
1493 node = nilfs_btree_get_root(btree);
1494 path[level].bp_oldreq.bpr_ptr =
1495 nilfs_btree_node_get_ptr(node, dindex,
1496 NILFS_BTREE_ROOT_NCHILDREN_MAX);
1497
1498 ret = nilfs_bmap_prepare_end_ptr(btree, &path[level].bp_oldreq, dat);
1499 if (ret < 0)
1500 goto err_out_child_node;
1501
1502 /* success */
1503 out:
1504 *levelp = level;
1505 return ret;
1506
1507 /* error */
1508 err_out_curr_node:
1509 nilfs_bmap_abort_end_ptr(btree, &path[level].bp_oldreq, dat);
1510 err_out_child_node:
1511 for (level--; level >= NILFS_BTREE_LEVEL_NODE_MIN; level--) {
1512 brelse(path[level].bp_sib_bh);
1513 nilfs_bmap_abort_end_ptr(btree, &path[level].bp_oldreq, dat);
1514 }
1515 *levelp = level;
1516 stats->bs_nblocks = 0;
1517 return ret;
1518 }
1519
1520 static void nilfs_btree_commit_delete(struct nilfs_bmap *btree,
1521 struct nilfs_btree_path *path,
1522 int maxlevel, struct inode *dat)
1523 {
1524 int level;
1525
1526 for (level = NILFS_BTREE_LEVEL_NODE_MIN; level <= maxlevel; level++) {
1527 nilfs_bmap_commit_end_ptr(btree, &path[level].bp_oldreq, dat);
1528 path[level].bp_op(btree, path, level, NULL, NULL);
1529 }
1530
1531 if (!nilfs_bmap_dirty(btree))
1532 nilfs_bmap_set_dirty(btree);
1533 }
1534
1535 static int nilfs_btree_delete(struct nilfs_bmap *btree, __u64 key)
1536
1537 {
1538 struct nilfs_btree_path *path;
1539 struct nilfs_bmap_stats stats;
1540 struct inode *dat;
1541 int level, ret;
1542
1543 path = nilfs_btree_alloc_path();
1544 if (path == NULL)
1545 return -ENOMEM;
1546
1547 ret = nilfs_btree_do_lookup(btree, path, key, NULL,
1548 NILFS_BTREE_LEVEL_NODE_MIN, 0);
1549 if (ret < 0)
1550 goto out;
1551
1552
1553 dat = NILFS_BMAP_USE_VBN(btree) ? nilfs_bmap_get_dat(btree) : NULL;
1554
1555 ret = nilfs_btree_prepare_delete(btree, path, &level, &stats, dat);
1556 if (ret < 0)
1557 goto out;
1558 nilfs_btree_commit_delete(btree, path, level, dat);
1559 nilfs_inode_sub_blocks(btree->b_inode, stats.bs_nblocks);
1560
1561 out:
1562 nilfs_btree_free_path(path);
1563 return ret;
1564 }
1565
1566 static int nilfs_btree_last_key(const struct nilfs_bmap *btree, __u64 *keyp)
1567 {
1568 struct nilfs_btree_path *path;
1569 int ret;
1570
1571 path = nilfs_btree_alloc_path();
1572 if (path == NULL)
1573 return -ENOMEM;
1574
1575 ret = nilfs_btree_do_lookup_last(btree, path, keyp, NULL);
1576
1577 nilfs_btree_free_path(path);
1578
1579 return ret;
1580 }
1581
1582 static int nilfs_btree_check_delete(struct nilfs_bmap *btree, __u64 key)
1583 {
1584 struct buffer_head *bh;
1585 struct nilfs_btree_node *root, *node;
1586 __u64 maxkey, nextmaxkey;
1587 __u64 ptr;
1588 int nchildren, ret;
1589
1590 root = nilfs_btree_get_root(btree);
1591 switch (nilfs_btree_height(btree)) {
1592 case 2:
1593 bh = NULL;
1594 node = root;
1595 break;
1596 case 3:
1597 nchildren = nilfs_btree_node_get_nchildren(root);
1598 if (nchildren > 1)
1599 return 0;
1600 ptr = nilfs_btree_node_get_ptr(root, nchildren - 1,
1601 NILFS_BTREE_ROOT_NCHILDREN_MAX);
1602 ret = nilfs_btree_get_block(btree, ptr, &bh);
1603 if (ret < 0)
1604 return ret;
1605 node = (struct nilfs_btree_node *)bh->b_data;
1606 break;
1607 default:
1608 return 0;
1609 }
1610
1611 nchildren = nilfs_btree_node_get_nchildren(node);
1612 maxkey = nilfs_btree_node_get_key(node, nchildren - 1);
1613 nextmaxkey = (nchildren > 1) ?
1614 nilfs_btree_node_get_key(node, nchildren - 2) : 0;
1615 if (bh != NULL)
1616 brelse(bh);
1617
1618 return (maxkey == key) && (nextmaxkey < NILFS_BMAP_LARGE_LOW);
1619 }
1620
1621 static int nilfs_btree_gather_data(struct nilfs_bmap *btree,
1622 __u64 *keys, __u64 *ptrs, int nitems)
1623 {
1624 struct buffer_head *bh;
1625 struct nilfs_btree_node *node, *root;
1626 __le64 *dkeys;
1627 __le64 *dptrs;
1628 __u64 ptr;
1629 int nchildren, ncmax, i, ret;
1630
1631 root = nilfs_btree_get_root(btree);
1632 switch (nilfs_btree_height(btree)) {
1633 case 2:
1634 bh = NULL;
1635 node = root;
1636 ncmax = NILFS_BTREE_ROOT_NCHILDREN_MAX;
1637 break;
1638 case 3:
1639 nchildren = nilfs_btree_node_get_nchildren(root);
1640 WARN_ON(nchildren > 1);
1641 ptr = nilfs_btree_node_get_ptr(root, nchildren - 1,
1642 NILFS_BTREE_ROOT_NCHILDREN_MAX);
1643 ret = nilfs_btree_get_block(btree, ptr, &bh);
1644 if (ret < 0)
1645 return ret;
1646 node = (struct nilfs_btree_node *)bh->b_data;
1647 ncmax = nilfs_btree_nchildren_per_block(btree);
1648 break;
1649 default:
1650 node = NULL;
1651 return -EINVAL;
1652 }
1653
1654 nchildren = nilfs_btree_node_get_nchildren(node);
1655 if (nchildren < nitems)
1656 nitems = nchildren;
1657 dkeys = nilfs_btree_node_dkeys(node);
1658 dptrs = nilfs_btree_node_dptrs(node, ncmax);
1659 for (i = 0; i < nitems; i++) {
1660 keys[i] = le64_to_cpu(dkeys[i]);
1661 ptrs[i] = le64_to_cpu(dptrs[i]);
1662 }
1663
1664 if (bh != NULL)
1665 brelse(bh);
1666
1667 return nitems;
1668 }
1669
1670 static int
1671 nilfs_btree_prepare_convert_and_insert(struct nilfs_bmap *btree, __u64 key,
1672 union nilfs_bmap_ptr_req *dreq,
1673 union nilfs_bmap_ptr_req *nreq,
1674 struct buffer_head **bhp,
1675 struct nilfs_bmap_stats *stats)
1676 {
1677 struct buffer_head *bh;
1678 struct inode *dat = NULL;
1679 int ret;
1680
1681 stats->bs_nblocks = 0;
1682
1683 /* for data */
1684 /* cannot find near ptr */
1685 if (NILFS_BMAP_USE_VBN(btree)) {
1686 dreq->bpr_ptr = nilfs_btree_find_target_v(btree, NULL, key);
1687 dat = nilfs_bmap_get_dat(btree);
1688 }
1689
1690 ret = nilfs_bmap_prepare_alloc_ptr(btree, dreq, dat);
1691 if (ret < 0)
1692 return ret;
1693
1694 *bhp = NULL;
1695 stats->bs_nblocks++;
1696 if (nreq != NULL) {
1697 nreq->bpr_ptr = dreq->bpr_ptr + 1;
1698 ret = nilfs_bmap_prepare_alloc_ptr(btree, nreq, dat);
1699 if (ret < 0)
1700 goto err_out_dreq;
1701
1702 ret = nilfs_btree_get_new_block(btree, nreq->bpr_ptr, &bh);
1703 if (ret < 0)
1704 goto err_out_nreq;
1705
1706 *bhp = bh;
1707 stats->bs_nblocks++;
1708 }
1709
1710 /* success */
1711 return 0;
1712
1713 /* error */
1714 err_out_nreq:
1715 nilfs_bmap_abort_alloc_ptr(btree, nreq, dat);
1716 err_out_dreq:
1717 nilfs_bmap_abort_alloc_ptr(btree, dreq, dat);
1718 stats->bs_nblocks = 0;
1719 return ret;
1720
1721 }
1722
1723 static void
1724 nilfs_btree_commit_convert_and_insert(struct nilfs_bmap *btree,
1725 __u64 key, __u64 ptr,
1726 const __u64 *keys, const __u64 *ptrs,
1727 int n,
1728 union nilfs_bmap_ptr_req *dreq,
1729 union nilfs_bmap_ptr_req *nreq,
1730 struct buffer_head *bh)
1731 {
1732 struct nilfs_btree_node *node;
1733 struct inode *dat;
1734 __u64 tmpptr;
1735 int ncblk;
1736
1737 /* free resources */
1738 if (btree->b_ops->bop_clear != NULL)
1739 btree->b_ops->bop_clear(btree);
1740
1741 /* ptr must be a pointer to a buffer head. */
1742 set_buffer_nilfs_volatile((struct buffer_head *)((unsigned long)ptr));
1743
1744 /* convert and insert */
1745 dat = NILFS_BMAP_USE_VBN(btree) ? nilfs_bmap_get_dat(btree) : NULL;
1746 __nilfs_btree_init(btree);
1747 if (nreq != NULL) {
1748 nilfs_bmap_commit_alloc_ptr(btree, dreq, dat);
1749 nilfs_bmap_commit_alloc_ptr(btree, nreq, dat);
1750
1751 /* create child node at level 1 */
1752 node = (struct nilfs_btree_node *)bh->b_data;
1753 ncblk = nilfs_btree_nchildren_per_block(btree);
1754 nilfs_btree_node_init(node, 0, 1, n, ncblk, keys, ptrs);
1755 nilfs_btree_node_insert(node, n, key, dreq->bpr_ptr, ncblk);
1756 if (!buffer_dirty(bh))
1757 mark_buffer_dirty(bh);
1758 if (!nilfs_bmap_dirty(btree))
1759 nilfs_bmap_set_dirty(btree);
1760
1761 brelse(bh);
1762
1763 /* create root node at level 2 */
1764 node = nilfs_btree_get_root(btree);
1765 tmpptr = nreq->bpr_ptr;
1766 nilfs_btree_node_init(node, NILFS_BTREE_NODE_ROOT, 2, 1,
1767 NILFS_BTREE_ROOT_NCHILDREN_MAX,
1768 &keys[0], &tmpptr);
1769 } else {
1770 nilfs_bmap_commit_alloc_ptr(btree, dreq, dat);
1771
1772 /* create root node at level 1 */
1773 node = nilfs_btree_get_root(btree);
1774 nilfs_btree_node_init(node, NILFS_BTREE_NODE_ROOT, 1, n,
1775 NILFS_BTREE_ROOT_NCHILDREN_MAX,
1776 keys, ptrs);
1777 nilfs_btree_node_insert(node, n, key, dreq->bpr_ptr,
1778 NILFS_BTREE_ROOT_NCHILDREN_MAX);
1779 if (!nilfs_bmap_dirty(btree))
1780 nilfs_bmap_set_dirty(btree);
1781 }
1782
1783 if (NILFS_BMAP_USE_VBN(btree))
1784 nilfs_bmap_set_target_v(btree, key, dreq->bpr_ptr);
1785 }
1786
1787 /**
1788 * nilfs_btree_convert_and_insert -
1789 * @bmap:
1790 * @key:
1791 * @ptr:
1792 * @keys:
1793 * @ptrs:
1794 * @n:
1795 */
1796 int nilfs_btree_convert_and_insert(struct nilfs_bmap *btree,
1797 __u64 key, __u64 ptr,
1798 const __u64 *keys, const __u64 *ptrs, int n)
1799 {
1800 struct buffer_head *bh;
1801 union nilfs_bmap_ptr_req dreq, nreq, *di, *ni;
1802 struct nilfs_bmap_stats stats;
1803 int ret;
1804
1805 if (n + 1 <= NILFS_BTREE_ROOT_NCHILDREN_MAX) {
1806 di = &dreq;
1807 ni = NULL;
1808 } else if ((n + 1) <= NILFS_BTREE_NODE_NCHILDREN_MAX(
1809 1 << btree->b_inode->i_blkbits)) {
1810 di = &dreq;
1811 ni = &nreq;
1812 } else {
1813 di = NULL;
1814 ni = NULL;
1815 BUG();
1816 }
1817
1818 ret = nilfs_btree_prepare_convert_and_insert(btree, key, di, ni, &bh,
1819 &stats);
1820 if (ret < 0)
1821 return ret;
1822 nilfs_btree_commit_convert_and_insert(btree, key, ptr, keys, ptrs, n,
1823 di, ni, bh);
1824 nilfs_inode_add_blocks(btree->b_inode, stats.bs_nblocks);
1825 return 0;
1826 }
1827
1828 static int nilfs_btree_propagate_p(struct nilfs_bmap *btree,
1829 struct nilfs_btree_path *path,
1830 int level,
1831 struct buffer_head *bh)
1832 {
1833 while ((++level < nilfs_btree_height(btree) - 1) &&
1834 !buffer_dirty(path[level].bp_bh))
1835 mark_buffer_dirty(path[level].bp_bh);
1836
1837 return 0;
1838 }
1839
1840 static int nilfs_btree_prepare_update_v(struct nilfs_bmap *btree,
1841 struct nilfs_btree_path *path,
1842 int level, struct inode *dat)
1843 {
1844 struct nilfs_btree_node *parent;
1845 int ncmax, ret;
1846
1847 parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax);
1848 path[level].bp_oldreq.bpr_ptr =
1849 nilfs_btree_node_get_ptr(parent, path[level + 1].bp_index,
1850 ncmax);
1851 path[level].bp_newreq.bpr_ptr = path[level].bp_oldreq.bpr_ptr + 1;
1852 ret = nilfs_dat_prepare_update(dat, &path[level].bp_oldreq.bpr_req,
1853 &path[level].bp_newreq.bpr_req);
1854 if (ret < 0)
1855 return ret;
1856
1857 if (buffer_nilfs_node(path[level].bp_bh)) {
1858 path[level].bp_ctxt.oldkey = path[level].bp_oldreq.bpr_ptr;
1859 path[level].bp_ctxt.newkey = path[level].bp_newreq.bpr_ptr;
1860 path[level].bp_ctxt.bh = path[level].bp_bh;
1861 ret = nilfs_btnode_prepare_change_key(
1862 &NILFS_BMAP_I(btree)->i_btnode_cache,
1863 &path[level].bp_ctxt);
1864 if (ret < 0) {
1865 nilfs_dat_abort_update(dat,
1866 &path[level].bp_oldreq.bpr_req,
1867 &path[level].bp_newreq.bpr_req);
1868 return ret;
1869 }
1870 }
1871
1872 return 0;
1873 }
1874
1875 static void nilfs_btree_commit_update_v(struct nilfs_bmap *btree,
1876 struct nilfs_btree_path *path,
1877 int level, struct inode *dat)
1878 {
1879 struct nilfs_btree_node *parent;
1880 int ncmax;
1881
1882 nilfs_dat_commit_update(dat, &path[level].bp_oldreq.bpr_req,
1883 &path[level].bp_newreq.bpr_req,
1884 btree->b_ptr_type == NILFS_BMAP_PTR_VS);
1885
1886 if (buffer_nilfs_node(path[level].bp_bh)) {
1887 nilfs_btnode_commit_change_key(
1888 &NILFS_BMAP_I(btree)->i_btnode_cache,
1889 &path[level].bp_ctxt);
1890 path[level].bp_bh = path[level].bp_ctxt.bh;
1891 }
1892 set_buffer_nilfs_volatile(path[level].bp_bh);
1893
1894 parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax);
1895 nilfs_btree_node_set_ptr(parent, path[level + 1].bp_index,
1896 path[level].bp_newreq.bpr_ptr, ncmax);
1897 }
1898
1899 static void nilfs_btree_abort_update_v(struct nilfs_bmap *btree,
1900 struct nilfs_btree_path *path,
1901 int level, struct inode *dat)
1902 {
1903 nilfs_dat_abort_update(dat, &path[level].bp_oldreq.bpr_req,
1904 &path[level].bp_newreq.bpr_req);
1905 if (buffer_nilfs_node(path[level].bp_bh))
1906 nilfs_btnode_abort_change_key(
1907 &NILFS_BMAP_I(btree)->i_btnode_cache,
1908 &path[level].bp_ctxt);
1909 }
1910
1911 static int nilfs_btree_prepare_propagate_v(struct nilfs_bmap *btree,
1912 struct nilfs_btree_path *path,
1913 int minlevel, int *maxlevelp,
1914 struct inode *dat)
1915 {
1916 int level, ret;
1917
1918 level = minlevel;
1919 if (!buffer_nilfs_volatile(path[level].bp_bh)) {
1920 ret = nilfs_btree_prepare_update_v(btree, path, level, dat);
1921 if (ret < 0)
1922 return ret;
1923 }
1924 while ((++level < nilfs_btree_height(btree) - 1) &&
1925 !buffer_dirty(path[level].bp_bh)) {
1926
1927 WARN_ON(buffer_nilfs_volatile(path[level].bp_bh));
1928 ret = nilfs_btree_prepare_update_v(btree, path, level, dat);
1929 if (ret < 0)
1930 goto out;
1931 }
1932
1933 /* success */
1934 *maxlevelp = level - 1;
1935 return 0;
1936
1937 /* error */
1938 out:
1939 while (--level > minlevel)
1940 nilfs_btree_abort_update_v(btree, path, level, dat);
1941 if (!buffer_nilfs_volatile(path[level].bp_bh))
1942 nilfs_btree_abort_update_v(btree, path, level, dat);
1943 return ret;
1944 }
1945
1946 static void nilfs_btree_commit_propagate_v(struct nilfs_bmap *btree,
1947 struct nilfs_btree_path *path,
1948 int minlevel, int maxlevel,
1949 struct buffer_head *bh,
1950 struct inode *dat)
1951 {
1952 int level;
1953
1954 if (!buffer_nilfs_volatile(path[minlevel].bp_bh))
1955 nilfs_btree_commit_update_v(btree, path, minlevel, dat);
1956
1957 for (level = minlevel + 1; level <= maxlevel; level++)
1958 nilfs_btree_commit_update_v(btree, path, level, dat);
1959 }
1960
1961 static int nilfs_btree_propagate_v(struct nilfs_bmap *btree,
1962 struct nilfs_btree_path *path,
1963 int level, struct buffer_head *bh)
1964 {
1965 int maxlevel = 0, ret;
1966 struct nilfs_btree_node *parent;
1967 struct inode *dat = nilfs_bmap_get_dat(btree);
1968 __u64 ptr;
1969 int ncmax;
1970
1971 get_bh(bh);
1972 path[level].bp_bh = bh;
1973 ret = nilfs_btree_prepare_propagate_v(btree, path, level, &maxlevel,
1974 dat);
1975 if (ret < 0)
1976 goto out;
1977
1978 if (buffer_nilfs_volatile(path[level].bp_bh)) {
1979 parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax);
1980 ptr = nilfs_btree_node_get_ptr(parent,
1981 path[level + 1].bp_index,
1982 ncmax);
1983 ret = nilfs_dat_mark_dirty(dat, ptr);
1984 if (ret < 0)
1985 goto out;
1986 }
1987
1988 nilfs_btree_commit_propagate_v(btree, path, level, maxlevel, bh, dat);
1989
1990 out:
1991 brelse(path[level].bp_bh);
1992 path[level].bp_bh = NULL;
1993 return ret;
1994 }
1995
1996 static int nilfs_btree_propagate(struct nilfs_bmap *btree,
1997 struct buffer_head *bh)
1998 {
1999 struct nilfs_btree_path *path;
2000 struct nilfs_btree_node *node;
2001 __u64 key;
2002 int level, ret;
2003
2004 WARN_ON(!buffer_dirty(bh));
2005
2006 path = nilfs_btree_alloc_path();
2007 if (path == NULL)
2008 return -ENOMEM;
2009
2010 if (buffer_nilfs_node(bh)) {
2011 node = (struct nilfs_btree_node *)bh->b_data;
2012 key = nilfs_btree_node_get_key(node, 0);
2013 level = nilfs_btree_node_get_level(node);
2014 } else {
2015 key = nilfs_bmap_data_get_key(btree, bh);
2016 level = NILFS_BTREE_LEVEL_DATA;
2017 }
2018
2019 ret = nilfs_btree_do_lookup(btree, path, key, NULL, level + 1, 0);
2020 if (ret < 0) {
2021 if (unlikely(ret == -ENOENT))
2022 printk(KERN_CRIT "%s: key = %llu, level == %d\n",
2023 __func__, (unsigned long long)key, level);
2024 goto out;
2025 }
2026
2027 ret = NILFS_BMAP_USE_VBN(btree) ?
2028 nilfs_btree_propagate_v(btree, path, level, bh) :
2029 nilfs_btree_propagate_p(btree, path, level, bh);
2030
2031 out:
2032 nilfs_btree_free_path(path);
2033
2034 return ret;
2035 }
2036
2037 static int nilfs_btree_propagate_gc(struct nilfs_bmap *btree,
2038 struct buffer_head *bh)
2039 {
2040 return nilfs_dat_mark_dirty(nilfs_bmap_get_dat(btree), bh->b_blocknr);
2041 }
2042
2043 static void nilfs_btree_add_dirty_buffer(struct nilfs_bmap *btree,
2044 struct list_head *lists,
2045 struct buffer_head *bh)
2046 {
2047 struct list_head *head;
2048 struct buffer_head *cbh;
2049 struct nilfs_btree_node *node, *cnode;
2050 __u64 key, ckey;
2051 int level;
2052
2053 get_bh(bh);
2054 node = (struct nilfs_btree_node *)bh->b_data;
2055 key = nilfs_btree_node_get_key(node, 0);
2056 level = nilfs_btree_node_get_level(node);
2057 if (level < NILFS_BTREE_LEVEL_NODE_MIN ||
2058 level >= NILFS_BTREE_LEVEL_MAX) {
2059 dump_stack();
2060 printk(KERN_WARNING
2061 "%s: invalid btree level: %d (key=%llu, ino=%lu, "
2062 "blocknr=%llu)\n",
2063 __func__, level, (unsigned long long)key,
2064 NILFS_BMAP_I(btree)->vfs_inode.i_ino,
2065 (unsigned long long)bh->b_blocknr);
2066 return;
2067 }
2068
2069 list_for_each(head, &lists[level]) {
2070 cbh = list_entry(head, struct buffer_head, b_assoc_buffers);
2071 cnode = (struct nilfs_btree_node *)cbh->b_data;
2072 ckey = nilfs_btree_node_get_key(cnode, 0);
2073 if (key < ckey)
2074 break;
2075 }
2076 list_add_tail(&bh->b_assoc_buffers, head);
2077 }
2078
2079 static void nilfs_btree_lookup_dirty_buffers(struct nilfs_bmap *btree,
2080 struct list_head *listp)
2081 {
2082 struct address_space *btcache = &NILFS_BMAP_I(btree)->i_btnode_cache;
2083 struct list_head lists[NILFS_BTREE_LEVEL_MAX];
2084 struct pagevec pvec;
2085 struct buffer_head *bh, *head;
2086 pgoff_t index = 0;
2087 int level, i;
2088
2089 for (level = NILFS_BTREE_LEVEL_NODE_MIN;
2090 level < NILFS_BTREE_LEVEL_MAX;
2091 level++)
2092 INIT_LIST_HEAD(&lists[level]);
2093
2094 pagevec_init(&pvec, 0);
2095
2096 while (pagevec_lookup_tag(&pvec, btcache, &index, PAGECACHE_TAG_DIRTY,
2097 PAGEVEC_SIZE)) {
2098 for (i = 0; i < pagevec_count(&pvec); i++) {
2099 bh = head = page_buffers(pvec.pages[i]);
2100 do {
2101 if (buffer_dirty(bh))
2102 nilfs_btree_add_dirty_buffer(btree,
2103 lists, bh);
2104 } while ((bh = bh->b_this_page) != head);
2105 }
2106 pagevec_release(&pvec);
2107 cond_resched();
2108 }
2109
2110 for (level = NILFS_BTREE_LEVEL_NODE_MIN;
2111 level < NILFS_BTREE_LEVEL_MAX;
2112 level++)
2113 list_splice_tail(&lists[level], listp);
2114 }
2115
2116 static int nilfs_btree_assign_p(struct nilfs_bmap *btree,
2117 struct nilfs_btree_path *path,
2118 int level,
2119 struct buffer_head **bh,
2120 sector_t blocknr,
2121 union nilfs_binfo *binfo)
2122 {
2123 struct nilfs_btree_node *parent;
2124 __u64 key;
2125 __u64 ptr;
2126 int ncmax, ret;
2127
2128 parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax);
2129 ptr = nilfs_btree_node_get_ptr(parent, path[level + 1].bp_index,
2130 ncmax);
2131 if (buffer_nilfs_node(*bh)) {
2132 path[level].bp_ctxt.oldkey = ptr;
2133 path[level].bp_ctxt.newkey = blocknr;
2134 path[level].bp_ctxt.bh = *bh;
2135 ret = nilfs_btnode_prepare_change_key(
2136 &NILFS_BMAP_I(btree)->i_btnode_cache,
2137 &path[level].bp_ctxt);
2138 if (ret < 0)
2139 return ret;
2140 nilfs_btnode_commit_change_key(
2141 &NILFS_BMAP_I(btree)->i_btnode_cache,
2142 &path[level].bp_ctxt);
2143 *bh = path[level].bp_ctxt.bh;
2144 }
2145
2146 nilfs_btree_node_set_ptr(parent, path[level + 1].bp_index, blocknr,
2147 ncmax);
2148
2149 key = nilfs_btree_node_get_key(parent, path[level + 1].bp_index);
2150 /* on-disk format */
2151 binfo->bi_dat.bi_blkoff = cpu_to_le64(key);
2152 binfo->bi_dat.bi_level = level;
2153
2154 return 0;
2155 }
2156
2157 static int nilfs_btree_assign_v(struct nilfs_bmap *btree,
2158 struct nilfs_btree_path *path,
2159 int level,
2160 struct buffer_head **bh,
2161 sector_t blocknr,
2162 union nilfs_binfo *binfo)
2163 {
2164 struct nilfs_btree_node *parent;
2165 struct inode *dat = nilfs_bmap_get_dat(btree);
2166 __u64 key;
2167 __u64 ptr;
2168 union nilfs_bmap_ptr_req req;
2169 int ncmax, ret;
2170
2171 parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax);
2172 ptr = nilfs_btree_node_get_ptr(parent, path[level + 1].bp_index,
2173 ncmax);
2174 req.bpr_ptr = ptr;
2175 ret = nilfs_dat_prepare_start(dat, &req.bpr_req);
2176 if (ret < 0)
2177 return ret;
2178 nilfs_dat_commit_start(dat, &req.bpr_req, blocknr);
2179
2180 key = nilfs_btree_node_get_key(parent, path[level + 1].bp_index);
2181 /* on-disk format */
2182 binfo->bi_v.bi_vblocknr = cpu_to_le64(ptr);
2183 binfo->bi_v.bi_blkoff = cpu_to_le64(key);
2184
2185 return 0;
2186 }
2187
2188 static int nilfs_btree_assign(struct nilfs_bmap *btree,
2189 struct buffer_head **bh,
2190 sector_t blocknr,
2191 union nilfs_binfo *binfo)
2192 {
2193 struct nilfs_btree_path *path;
2194 struct nilfs_btree_node *node;
2195 __u64 key;
2196 int level, ret;
2197
2198 path = nilfs_btree_alloc_path();
2199 if (path == NULL)
2200 return -ENOMEM;
2201
2202 if (buffer_nilfs_node(*bh)) {
2203 node = (struct nilfs_btree_node *)(*bh)->b_data;
2204 key = nilfs_btree_node_get_key(node, 0);
2205 level = nilfs_btree_node_get_level(node);
2206 } else {
2207 key = nilfs_bmap_data_get_key(btree, *bh);
2208 level = NILFS_BTREE_LEVEL_DATA;
2209 }
2210
2211 ret = nilfs_btree_do_lookup(btree, path, key, NULL, level + 1, 0);
2212 if (ret < 0) {
2213 WARN_ON(ret == -ENOENT);
2214 goto out;
2215 }
2216
2217 ret = NILFS_BMAP_USE_VBN(btree) ?
2218 nilfs_btree_assign_v(btree, path, level, bh, blocknr, binfo) :
2219 nilfs_btree_assign_p(btree, path, level, bh, blocknr, binfo);
2220
2221 out:
2222 nilfs_btree_free_path(path);
2223
2224 return ret;
2225 }
2226
2227 static int nilfs_btree_assign_gc(struct nilfs_bmap *btree,
2228 struct buffer_head **bh,
2229 sector_t blocknr,
2230 union nilfs_binfo *binfo)
2231 {
2232 struct nilfs_btree_node *node;
2233 __u64 key;
2234 int ret;
2235
2236 ret = nilfs_dat_move(nilfs_bmap_get_dat(btree), (*bh)->b_blocknr,
2237 blocknr);
2238 if (ret < 0)
2239 return ret;
2240
2241 if (buffer_nilfs_node(*bh)) {
2242 node = (struct nilfs_btree_node *)(*bh)->b_data;
2243 key = nilfs_btree_node_get_key(node, 0);
2244 } else
2245 key = nilfs_bmap_data_get_key(btree, *bh);
2246
2247 /* on-disk format */
2248 binfo->bi_v.bi_vblocknr = cpu_to_le64((*bh)->b_blocknr);
2249 binfo->bi_v.bi_blkoff = cpu_to_le64(key);
2250
2251 return 0;
2252 }
2253
2254 static int nilfs_btree_mark(struct nilfs_bmap *btree, __u64 key, int level)
2255 {
2256 struct buffer_head *bh;
2257 struct nilfs_btree_path *path;
2258 __u64 ptr;
2259 int ret;
2260
2261 path = nilfs_btree_alloc_path();
2262 if (path == NULL)
2263 return -ENOMEM;
2264
2265 ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level + 1, 0);
2266 if (ret < 0) {
2267 WARN_ON(ret == -ENOENT);
2268 goto out;
2269 }
2270 ret = nilfs_btree_get_block(btree, ptr, &bh);
2271 if (ret < 0) {
2272 WARN_ON(ret == -ENOENT);
2273 goto out;
2274 }
2275
2276 if (!buffer_dirty(bh))
2277 mark_buffer_dirty(bh);
2278 brelse(bh);
2279 if (!nilfs_bmap_dirty(btree))
2280 nilfs_bmap_set_dirty(btree);
2281
2282 out:
2283 nilfs_btree_free_path(path);
2284 return ret;
2285 }
2286
2287 static const struct nilfs_bmap_operations nilfs_btree_ops = {
2288 .bop_lookup = nilfs_btree_lookup,
2289 .bop_lookup_contig = nilfs_btree_lookup_contig,
2290 .bop_insert = nilfs_btree_insert,
2291 .bop_delete = nilfs_btree_delete,
2292 .bop_clear = NULL,
2293
2294 .bop_propagate = nilfs_btree_propagate,
2295
2296 .bop_lookup_dirty_buffers = nilfs_btree_lookup_dirty_buffers,
2297
2298 .bop_assign = nilfs_btree_assign,
2299 .bop_mark = nilfs_btree_mark,
2300
2301 .bop_last_key = nilfs_btree_last_key,
2302 .bop_check_insert = NULL,
2303 .bop_check_delete = nilfs_btree_check_delete,
2304 .bop_gather_data = nilfs_btree_gather_data,
2305 };
2306
2307 static const struct nilfs_bmap_operations nilfs_btree_ops_gc = {
2308 .bop_lookup = NULL,
2309 .bop_lookup_contig = NULL,
2310 .bop_insert = NULL,
2311 .bop_delete = NULL,
2312 .bop_clear = NULL,
2313
2314 .bop_propagate = nilfs_btree_propagate_gc,
2315
2316 .bop_lookup_dirty_buffers = nilfs_btree_lookup_dirty_buffers,
2317
2318 .bop_assign = nilfs_btree_assign_gc,
2319 .bop_mark = NULL,
2320
2321 .bop_last_key = NULL,
2322 .bop_check_insert = NULL,
2323 .bop_check_delete = NULL,
2324 .bop_gather_data = NULL,
2325 };
2326
2327 static void __nilfs_btree_init(struct nilfs_bmap *bmap)
2328 {
2329 bmap->b_ops = &nilfs_btree_ops;
2330 bmap->b_nchildren_per_block =
2331 NILFS_BTREE_NODE_NCHILDREN_MAX(nilfs_btree_node_size(bmap));
2332 }
2333
2334 int nilfs_btree_init(struct nilfs_bmap *bmap)
2335 {
2336 int ret = 0;
2337
2338 __nilfs_btree_init(bmap);
2339
2340 if (nilfs_btree_root_broken(nilfs_btree_get_root(bmap),
2341 bmap->b_inode->i_ino))
2342 ret = -EIO;
2343 return ret;
2344 }
2345
2346 void nilfs_btree_init_gc(struct nilfs_bmap *bmap)
2347 {
2348 bmap->b_ops = &nilfs_btree_ops_gc;
2349 bmap->b_nchildren_per_block =
2350 NILFS_BTREE_NODE_NCHILDREN_MAX(nilfs_btree_node_size(bmap));
2351 }
Linux kernel - Deliverables
This page took 0.11287 seconds and 5 git commands to generate.