1 // SPDX-License-Identifier: GPL-2.0
4 #include "alloc_background.h"
5 #include "backpointers.h"
7 #include "btree_cache.h"
8 #include "btree_update.h"
9 #include "btree_update_interior.h"
10 #include "btree_write_buffer.h"
15 static bool extent_matches_bp(struct bch_fs *c,
16 enum btree_id btree_id, unsigned level,
19 struct bch_backpointer bp)
21 struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
22 const union bch_extent_entry *entry;
23 struct extent_ptr_decoded p;
25 bkey_for_each_ptr_decode(k.k, ptrs, p, entry) {
27 struct bch_backpointer bp2;
32 bch2_extent_ptr_to_bp(c, btree_id, level, k, p,
34 if (bpos_eq(bucket, bucket2) &&
35 !memcmp(&bp, &bp2, sizeof(bp)))
42 int bch2_backpointer_invalid(struct bch_fs *c, struct bkey_s_c k,
43 enum bkey_invalid_flags flags,
46 struct bkey_s_c_backpointer bp = bkey_s_c_to_backpointer(k);
47 struct bpos bucket = bp_pos_to_bucket(c, bp.k->p);
50 bkey_fsck_err_on(!bpos_eq(bp.k->p, bucket_pos_to_bp(c, bucket, bp.v->bucket_offset)),
52 backpointer_pos_wrong,
53 "backpointer at wrong pos");
58 void bch2_backpointer_to_text(struct printbuf *out, const struct bch_backpointer *bp)
60 prt_printf(out, "btree=%s l=%u offset=%llu:%u len=%u pos=",
61 bch2_btree_id_str(bp->btree_id),
63 (u64) (bp->bucket_offset >> MAX_EXTENT_COMPRESS_RATIO_SHIFT),
64 (u32) bp->bucket_offset & ~(~0U << MAX_EXTENT_COMPRESS_RATIO_SHIFT),
66 bch2_bpos_to_text(out, bp->pos);
69 void bch2_backpointer_k_to_text(struct printbuf *out, struct bch_fs *c, struct bkey_s_c k)
71 prt_str(out, "bucket=");
72 bch2_bpos_to_text(out, bp_pos_to_bucket(c, k.k->p));
75 bch2_backpointer_to_text(out, bkey_s_c_to_backpointer(k).v);
78 void bch2_backpointer_swab(struct bkey_s k)
80 struct bkey_s_backpointer bp = bkey_s_to_backpointer(k);
82 bp.v->bucket_offset = swab40(bp.v->bucket_offset);
83 bp.v->bucket_len = swab32(bp.v->bucket_len);
84 bch2_bpos_swab(&bp.v->pos);
87 static noinline int backpointer_mod_err(struct btree_trans *trans,
88 struct bch_backpointer bp,
90 struct bkey_s_c orig_k,
93 struct bch_fs *c = trans->c;
94 struct printbuf buf = PRINTBUF;
97 prt_printf(&buf, "existing backpointer found when inserting ");
98 bch2_backpointer_to_text(&buf, &bp);
100 printbuf_indent_add(&buf, 2);
102 prt_printf(&buf, "found ");
103 bch2_bkey_val_to_text(&buf, c, bp_k);
106 prt_printf(&buf, "for ");
107 bch2_bkey_val_to_text(&buf, c, orig_k);
109 bch_err(c, "%s", buf.buf);
110 } else if (c->curr_recovery_pass > BCH_RECOVERY_PASS_check_extents_to_backpointers) {
111 prt_printf(&buf, "backpointer not found when deleting");
113 printbuf_indent_add(&buf, 2);
115 prt_printf(&buf, "searching for ");
116 bch2_backpointer_to_text(&buf, &bp);
119 prt_printf(&buf, "got ");
120 bch2_bkey_val_to_text(&buf, c, bp_k);
123 prt_printf(&buf, "for ");
124 bch2_bkey_val_to_text(&buf, c, orig_k);
126 bch_err(c, "%s", buf.buf);
131 if (c->curr_recovery_pass > BCH_RECOVERY_PASS_check_extents_to_backpointers) {
132 bch2_inconsistent_error(c);
139 int bch2_bucket_backpointer_mod_nowritebuffer(struct btree_trans *trans,
141 struct bch_backpointer bp,
142 struct bkey_s_c orig_k,
145 struct btree_iter bp_iter;
147 struct bkey_i_backpointer *bp_k;
150 bp_k = bch2_trans_kmalloc_nomemzero(trans, sizeof(struct bkey_i_backpointer));
151 ret = PTR_ERR_OR_ZERO(bp_k);
155 bkey_backpointer_init(&bp_k->k_i);
156 bp_k->k.p = bucket_pos_to_bp(trans->c, bucket, bp.bucket_offset);
160 bp_k->k.type = KEY_TYPE_deleted;
161 set_bkey_val_u64s(&bp_k->k, 0);
164 k = bch2_bkey_get_iter(trans, &bp_iter, BTREE_ID_backpointers,
168 BTREE_ITER_WITH_UPDATES);
175 : (k.k->type != KEY_TYPE_backpointer ||
176 memcmp(bkey_s_c_to_backpointer(k).v, &bp, sizeof(bp)))) {
177 ret = backpointer_mod_err(trans, bp, k, orig_k, insert);
182 ret = bch2_trans_update(trans, &bp_iter, &bp_k->k_i, 0);
184 bch2_trans_iter_exit(trans, &bp_iter);
189 * Find the next backpointer >= *bp_offset:
191 int bch2_get_next_backpointer(struct btree_trans *trans,
192 struct bpos bucket, int gen,
194 struct bch_backpointer *bp,
197 struct bch_fs *c = trans->c;
198 struct bpos bp_end_pos = bucket_pos_to_bp(c, bpos_nosnap_successor(bucket), 0);
199 struct btree_iter alloc_iter = { NULL }, bp_iter = { NULL };
203 if (bpos_ge(*bp_pos, bp_end_pos))
207 k = bch2_bkey_get_iter(trans, &alloc_iter, BTREE_ID_alloc,
208 bucket, BTREE_ITER_CACHED|iter_flags);
213 if (k.k->type != KEY_TYPE_alloc_v4 ||
214 bkey_s_c_to_alloc_v4(k).v->gen != gen)
218 *bp_pos = bpos_max(*bp_pos, bucket_pos_to_bp(c, bucket, 0));
220 for_each_btree_key_norestart(trans, bp_iter, BTREE_ID_backpointers,
221 *bp_pos, iter_flags, k, ret) {
222 if (bpos_ge(k.k->p, bp_end_pos))
226 *bp = *bkey_s_c_to_backpointer(k).v;
232 bch2_trans_iter_exit(trans, &bp_iter);
233 bch2_trans_iter_exit(trans, &alloc_iter);
237 static void backpointer_not_found(struct btree_trans *trans,
239 struct bch_backpointer bp,
242 struct bch_fs *c = trans->c;
243 struct printbuf buf = PRINTBUF;
244 struct bpos bucket = bp_pos_to_bucket(c, bp_pos);
247 * If we're using the btree write buffer, the backpointer we were
248 * looking at may have already been deleted - failure to find what it
249 * pointed to is not an error:
251 if (likely(!bch2_backpointers_no_use_write_buffer))
254 prt_printf(&buf, "backpointer doesn't match %s it points to:\n ",
255 bp.level ? "btree node" : "extent");
256 prt_printf(&buf, "bucket: ");
257 bch2_bpos_to_text(&buf, bucket);
258 prt_printf(&buf, "\n ");
260 prt_printf(&buf, "backpointer pos: ");
261 bch2_bpos_to_text(&buf, bp_pos);
262 prt_printf(&buf, "\n ");
264 bch2_backpointer_to_text(&buf, &bp);
265 prt_printf(&buf, "\n ");
266 bch2_bkey_val_to_text(&buf, c, k);
267 if (c->curr_recovery_pass >= BCH_RECOVERY_PASS_check_extents_to_backpointers)
268 bch_err_ratelimited(c, "%s", buf.buf);
270 bch2_trans_inconsistent(trans, "%s", buf.buf);
275 struct bkey_s_c bch2_backpointer_get_key(struct btree_trans *trans,
276 struct btree_iter *iter,
278 struct bch_backpointer bp,
281 if (likely(!bp.level)) {
282 struct bch_fs *c = trans->c;
283 struct bpos bucket = bp_pos_to_bucket(c, bp_pos);
286 bch2_trans_node_iter_init(trans, iter,
291 k = bch2_btree_iter_peek_slot(iter);
293 bch2_trans_iter_exit(trans, iter);
297 if (k.k && extent_matches_bp(c, bp.btree_id, bp.level, k, bucket, bp))
300 bch2_trans_iter_exit(trans, iter);
301 backpointer_not_found(trans, bp_pos, bp, k);
302 return bkey_s_c_null;
304 struct btree *b = bch2_backpointer_get_node(trans, iter, bp_pos, bp);
306 if (IS_ERR_OR_NULL(b)) {
307 bch2_trans_iter_exit(trans, iter);
308 return IS_ERR(b) ? bkey_s_c_err(PTR_ERR(b)) : bkey_s_c_null;
310 return bkey_i_to_s_c(&b->key);
314 struct btree *bch2_backpointer_get_node(struct btree_trans *trans,
315 struct btree_iter *iter,
317 struct bch_backpointer bp)
319 struct bch_fs *c = trans->c;
320 struct bpos bucket = bp_pos_to_bucket(c, bp_pos);
325 bch2_trans_node_iter_init(trans, iter,
331 b = bch2_btree_iter_peek_node(iter);
332 if (IS_ERR_OR_NULL(b))
335 BUG_ON(b->c.level != bp.level - 1);
337 if (extent_matches_bp(c, bp.btree_id, bp.level,
338 bkey_i_to_s_c(&b->key),
342 if (btree_node_will_make_reachable(b)) {
343 b = ERR_PTR(-BCH_ERR_backpointer_to_overwritten_btree_node);
345 backpointer_not_found(trans, bp_pos, bp, bkey_i_to_s_c(&b->key));
349 bch2_trans_iter_exit(trans, iter);
353 static int bch2_check_btree_backpointer(struct btree_trans *trans, struct btree_iter *bp_iter,
356 struct bch_fs *c = trans->c;
357 struct btree_iter alloc_iter = { NULL };
358 struct bkey_s_c alloc_k;
359 struct printbuf buf = PRINTBUF;
362 if (fsck_err_on(!bch2_dev_exists2(c, k.k->p.inode), c,
363 backpointer_to_missing_device,
364 "backpointer for missing device:\n%s",
365 (bch2_bkey_val_to_text(&buf, c, k), buf.buf))) {
366 ret = bch2_btree_delete_at(trans, bp_iter, 0);
370 alloc_k = bch2_bkey_get_iter(trans, &alloc_iter, BTREE_ID_alloc,
371 bp_pos_to_bucket(c, k.k->p), 0);
372 ret = bkey_err(alloc_k);
376 if (fsck_err_on(alloc_k.k->type != KEY_TYPE_alloc_v4, c,
377 backpointer_to_missing_alloc,
378 "backpointer for nonexistent alloc key: %llu:%llu:0\n%s",
379 alloc_iter.pos.inode, alloc_iter.pos.offset,
380 (bch2_bkey_val_to_text(&buf, c, alloc_k), buf.buf))) {
381 ret = bch2_btree_delete_at(trans, bp_iter, 0);
386 bch2_trans_iter_exit(trans, &alloc_iter);
391 /* verify that every backpointer has a corresponding alloc key */
392 int bch2_check_btree_backpointers(struct bch_fs *c)
394 int ret = bch2_trans_run(c,
395 for_each_btree_key_commit(trans, iter,
396 BTREE_ID_backpointers, POS_MIN, 0, k,
397 NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
398 bch2_check_btree_backpointer(trans, &iter, k)));
403 static int check_bp_exists(struct btree_trans *trans,
405 struct bch_backpointer bp,
406 struct bkey_s_c orig_k,
407 struct bpos bucket_start,
408 struct bpos bucket_end,
409 struct bkey_buf *last_flushed)
411 struct bch_fs *c = trans->c;
412 struct btree_iter bp_iter = { NULL };
413 struct printbuf buf = PRINTBUF;
414 struct bkey_s_c bp_k;
418 bch2_bkey_buf_init(&tmp);
420 if (bpos_lt(bucket, bucket_start) ||
421 bpos_gt(bucket, bucket_end))
424 if (!bch2_dev_bucket_exists(c, bucket))
427 bp_k = bch2_bkey_get_iter(trans, &bp_iter, BTREE_ID_backpointers,
428 bucket_pos_to_bp(c, bucket, bp.bucket_offset),
430 ret = bkey_err(bp_k);
434 if (bp_k.k->type != KEY_TYPE_backpointer ||
435 memcmp(bkey_s_c_to_backpointer(bp_k).v, &bp, sizeof(bp))) {
436 if (!bpos_eq(orig_k.k->p, last_flushed->k->k.p) ||
437 bkey_bytes(orig_k.k) != bkey_bytes(&last_flushed->k->k) ||
438 memcmp(orig_k.v, &last_flushed->k->v, bkey_val_bytes(orig_k.k))) {
439 bch2_bkey_buf_reassemble(&tmp, c, orig_k);
442 bch2_trans_unlock(trans);
443 bch2_btree_interior_updates_flush(c);
446 ret = bch2_btree_write_buffer_flush_sync(trans);
450 bch2_bkey_buf_copy(last_flushed, c, tmp.k);
451 ret = -BCH_ERR_transaction_restart_write_buffer_flush;
459 bch2_trans_iter_exit(trans, &bp_iter);
460 bch2_bkey_buf_exit(&tmp, c);
464 prt_printf(&buf, "missing backpointer for btree=%s l=%u ",
465 bch2_btree_id_str(bp.btree_id), bp.level);
466 bch2_bkey_val_to_text(&buf, c, orig_k);
467 prt_printf(&buf, "\nbp pos ");
468 bch2_bpos_to_text(&buf, bp_iter.pos);
470 if (c->sb.version_upgrade_complete < bcachefs_metadata_version_backpointers ||
471 c->opts.reconstruct_alloc ||
472 fsck_err(c, ptr_to_missing_backpointer, "%s", buf.buf))
473 ret = bch2_bucket_backpointer_mod(trans, bucket, bp, orig_k, true);
478 static int check_extent_to_backpointers(struct btree_trans *trans,
479 enum btree_id btree, unsigned level,
480 struct bpos bucket_start,
481 struct bpos bucket_end,
482 struct bkey_buf *last_flushed,
485 struct bch_fs *c = trans->c;
486 struct bkey_ptrs_c ptrs;
487 const union bch_extent_entry *entry;
488 struct extent_ptr_decoded p;
491 ptrs = bch2_bkey_ptrs_c(k);
492 bkey_for_each_ptr_decode(k.k, ptrs, p, entry) {
493 struct bpos bucket_pos;
494 struct bch_backpointer bp;
499 bch2_extent_ptr_to_bp(c, btree, level,
500 k, p, &bucket_pos, &bp);
502 ret = check_bp_exists(trans, bucket_pos, bp, k,
503 bucket_start, bucket_end,
512 static int check_btree_root_to_backpointers(struct btree_trans *trans,
513 enum btree_id btree_id,
514 struct bpos bucket_start,
515 struct bpos bucket_end,
516 struct bkey_buf *last_flushed,
519 struct bch_fs *c = trans->c;
520 struct btree_iter iter;
525 bch2_trans_node_iter_init(trans, &iter, btree_id, POS_MIN,
526 0, bch2_btree_id_root(c, btree_id)->b->c.level, 0);
527 b = bch2_btree_iter_peek_node(&iter);
528 ret = PTR_ERR_OR_ZERO(b);
532 if (b != btree_node_root(c, b)) {
533 bch2_trans_iter_exit(trans, &iter);
539 k = bkey_i_to_s_c(&b->key);
540 ret = check_extent_to_backpointers(trans, btree_id, b->c.level + 1,
541 bucket_start, bucket_end,
544 bch2_trans_iter_exit(trans, &iter);
548 static inline struct bbpos bp_to_bbpos(struct bch_backpointer bp)
550 return (struct bbpos) {
551 .btree = bp.btree_id,
556 static size_t btree_nodes_fit_in_ram(struct bch_fs *c)
562 mem_bytes = i.totalram * i.mem_unit;
563 return div_u64(mem_bytes >> 1, btree_bytes(c));
566 static int bch2_get_btree_in_memory_pos(struct btree_trans *trans,
567 unsigned btree_leaf_mask,
568 unsigned btree_interior_mask,
569 struct bbpos start, struct bbpos *end)
571 struct btree_iter iter;
573 size_t btree_nodes = btree_nodes_fit_in_ram(trans->c);
577 for (btree = start.btree; btree < BTREE_ID_NR && !ret; btree++) {
578 unsigned depth = ((1U << btree) & btree_leaf_mask) ? 1 : 2;
580 if (!((1U << btree) & btree_leaf_mask) &&
581 !((1U << btree) & btree_interior_mask))
584 bch2_trans_node_iter_init(trans, &iter, btree,
585 btree == start.btree ? start.pos : POS_MIN,
588 * for_each_btree_key_contineu() doesn't check the return value
589 * from bch2_btree_iter_advance(), which is needed when
590 * iterating over interior nodes where we'll see keys at
594 k = __bch2_btree_iter_peek_and_restart(trans, &iter, 0);
601 *end = BBPOS(btree, k.k->p);
602 bch2_trans_iter_exit(trans, &iter);
605 } while (bch2_btree_iter_advance(&iter));
606 bch2_trans_iter_exit(trans, &iter);
613 static int bch2_check_extents_to_backpointers_pass(struct btree_trans *trans,
614 struct bpos bucket_start,
615 struct bpos bucket_end)
617 struct bch_fs *c = trans->c;
618 struct btree_iter iter;
619 enum btree_id btree_id;
621 struct bkey_buf last_flushed;
624 bch2_bkey_buf_init(&last_flushed);
625 bkey_init(&last_flushed.k->k);
627 for (btree_id = 0; btree_id < btree_id_nr_alive(c); btree_id++) {
628 int level, depth = btree_type_has_ptrs(btree_id) ? 0 : 1;
630 ret = commit_do(trans, NULL, NULL,
631 BCH_TRANS_COMMIT_no_enospc,
632 check_btree_root_to_backpointers(trans, btree_id,
633 bucket_start, bucket_end,
634 &last_flushed, &level));
638 while (level >= depth) {
639 bch2_trans_node_iter_init(trans, &iter, btree_id, POS_MIN, 0,
641 BTREE_ITER_PREFETCH);
643 bch2_trans_begin(trans);
644 k = bch2_btree_iter_peek(&iter);
648 check_extent_to_backpointers(trans, btree_id, level,
649 bucket_start, bucket_end,
651 bch2_trans_commit(trans, NULL, NULL,
652 BCH_TRANS_COMMIT_no_enospc);
653 if (bch2_err_matches(ret, BCH_ERR_transaction_restart)) {
659 if (bpos_eq(iter.pos, SPOS_MAX))
661 bch2_btree_iter_advance(&iter);
663 bch2_trans_iter_exit(trans, &iter);
672 bch2_bkey_buf_exit(&last_flushed, c);
676 static struct bpos bucket_pos_to_bp_safe(const struct bch_fs *c,
679 return bch2_dev_exists2(c, bucket.inode)
680 ? bucket_pos_to_bp(c, bucket, 0)
684 static int bch2_get_alloc_in_memory_pos(struct btree_trans *trans,
685 struct bpos start, struct bpos *end)
687 struct btree_iter alloc_iter;
688 struct btree_iter bp_iter;
689 struct bkey_s_c alloc_k, bp_k;
690 size_t btree_nodes = btree_nodes_fit_in_ram(trans->c);
691 bool alloc_end = false, bp_end = false;
694 bch2_trans_node_iter_init(trans, &alloc_iter, BTREE_ID_alloc,
696 bch2_trans_node_iter_init(trans, &bp_iter, BTREE_ID_backpointers,
697 bucket_pos_to_bp_safe(trans->c, start), 0, 1, 0);
700 ? __bch2_btree_iter_peek_and_restart(trans, &alloc_iter, 0)
703 ? __bch2_btree_iter_peek_and_restart(trans, &bp_iter, 0)
706 ret = bkey_err(alloc_k) ?: bkey_err(bp_k);
707 if ((!alloc_k.k && !bp_k.k) || ret) {
714 *end = alloc_k.k ? alloc_k.k->p : SPOS_MAX;
718 if (bpos_lt(alloc_iter.pos, SPOS_MAX) &&
719 bpos_lt(bucket_pos_to_bp_safe(trans->c, alloc_iter.pos), bp_iter.pos)) {
720 if (!bch2_btree_iter_advance(&alloc_iter))
723 if (!bch2_btree_iter_advance(&bp_iter))
727 bch2_trans_iter_exit(trans, &bp_iter);
728 bch2_trans_iter_exit(trans, &alloc_iter);
732 int bch2_check_extents_to_backpointers(struct bch_fs *c)
734 struct btree_trans *trans = bch2_trans_get(c);
735 struct bpos start = POS_MIN, end;
739 ret = bch2_get_alloc_in_memory_pos(trans, start, &end);
743 if (bpos_eq(start, POS_MIN) && !bpos_eq(end, SPOS_MAX))
744 bch_verbose(c, "%s(): alloc info does not fit in ram, running in multiple passes with %zu nodes per pass",
745 __func__, btree_nodes_fit_in_ram(c));
747 if (!bpos_eq(start, POS_MIN) || !bpos_eq(end, SPOS_MAX)) {
748 struct printbuf buf = PRINTBUF;
750 prt_str(&buf, "check_extents_to_backpointers(): ");
751 bch2_bpos_to_text(&buf, start);
753 bch2_bpos_to_text(&buf, end);
755 bch_verbose(c, "%s", buf.buf);
759 ret = bch2_check_extents_to_backpointers_pass(trans, start, end);
760 if (ret || bpos_eq(end, SPOS_MAX))
763 start = bpos_successor(end);
765 bch2_trans_put(trans);
771 static int check_one_backpointer(struct btree_trans *trans,
774 struct bkey_s_c_backpointer bp,
775 struct bpos *last_flushed_pos)
777 struct bch_fs *c = trans->c;
778 struct btree_iter iter;
779 struct bbpos pos = bp_to_bbpos(*bp.v);
781 struct printbuf buf = PRINTBUF;
784 if (bbpos_cmp(pos, start) < 0 ||
785 bbpos_cmp(pos, end) > 0)
788 k = bch2_backpointer_get_key(trans, &iter, bp.k->p, *bp.v, 0);
790 if (ret == -BCH_ERR_backpointer_to_overwritten_btree_node)
795 if (!k.k && !bpos_eq(*last_flushed_pos, bp.k->p)) {
796 *last_flushed_pos = bp.k->p;
797 ret = bch2_btree_write_buffer_flush_sync(trans) ?:
798 -BCH_ERR_transaction_restart_write_buffer_flush;
802 if (fsck_err_on(!k.k, c,
803 backpointer_to_missing_ptr,
804 "backpointer for missing %s\n %s",
805 bp.v->level ? "btree node" : "extent",
806 (bch2_bkey_val_to_text(&buf, c, bp.s_c), buf.buf))) {
807 ret = bch2_btree_delete_at_buffered(trans, BTREE_ID_backpointers, bp.k->p);
812 bch2_trans_iter_exit(trans, &iter);
817 static int bch2_check_backpointers_to_extents_pass(struct btree_trans *trans,
821 struct bpos last_flushed_pos = SPOS_MAX;
823 return for_each_btree_key_commit(trans, iter, BTREE_ID_backpointers,
824 POS_MIN, BTREE_ITER_PREFETCH, k,
825 NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
826 check_one_backpointer(trans, start, end,
827 bkey_s_c_to_backpointer(k),
831 int bch2_check_backpointers_to_extents(struct bch_fs *c)
833 struct btree_trans *trans = bch2_trans_get(c);
834 struct bbpos start = (struct bbpos) { .btree = 0, .pos = POS_MIN, }, end;
838 ret = bch2_get_btree_in_memory_pos(trans,
839 (1U << BTREE_ID_extents)|
840 (1U << BTREE_ID_reflink),
846 if (!bbpos_cmp(start, BBPOS_MIN) &&
847 bbpos_cmp(end, BBPOS_MAX))
848 bch_verbose(c, "%s(): extents do not fit in ram, running in multiple passes with %zu nodes per pass",
849 __func__, btree_nodes_fit_in_ram(c));
851 if (bbpos_cmp(start, BBPOS_MIN) ||
852 bbpos_cmp(end, BBPOS_MAX)) {
853 struct printbuf buf = PRINTBUF;
855 prt_str(&buf, "check_backpointers_to_extents(): ");
856 bch2_bbpos_to_text(&buf, start);
858 bch2_bbpos_to_text(&buf, end);
860 bch_verbose(c, "%s", buf.buf);
864 ret = bch2_check_backpointers_to_extents_pass(trans, start, end);
865 if (ret || !bbpos_cmp(end, BBPOS_MAX))
868 start = bbpos_successor(end);
870 bch2_trans_put(trans);