1 // SPDX-License-Identifier: GPL-2.0
4 #include "alloc_background.h"
5 #include "backpointers.h"
6 #include "btree_cache.h"
7 #include "btree_update.h"
12 #define MAX_EXTENT_COMPRESS_RATIO_SHIFT 10
15 * Convert from pos in backpointer btree to pos of corresponding bucket in alloc
18 static inline struct bpos bp_pos_to_bucket(const struct bch_fs *c,
21 struct bch_dev *ca = bch_dev_bkey_exists(c, bp_pos.inode);
22 u64 bucket_sector = bp_pos.offset >> MAX_EXTENT_COMPRESS_RATIO_SHIFT;
24 return POS(bp_pos.inode, sector_to_bucket(ca, bucket_sector));
28 * Convert from pos in alloc btree + bucket offset to pos in backpointer btree:
30 static inline struct bpos bucket_pos_to_bp(const struct bch_fs *c,
34 struct bch_dev *ca = bch_dev_bkey_exists(c, bucket.inode);
37 ret = POS(bucket.inode,
38 (bucket_to_sector(ca, bucket.offset) <<
39 MAX_EXTENT_COMPRESS_RATIO_SHIFT) + bucket_offset);
41 BUG_ON(bpos_cmp(bucket, bp_pos_to_bucket(c, ret)));
46 void bch2_extent_ptr_to_bp(struct bch_fs *c,
47 enum btree_id btree_id, unsigned level,
48 struct bkey_s_c k, struct extent_ptr_decoded p,
49 struct bpos *bucket_pos, struct bch_backpointer *bp)
51 enum bch_data_type data_type = level ? BCH_DATA_btree : BCH_DATA_user;
52 s64 sectors = level ? btree_sectors(c) : k.k->size;
55 *bucket_pos = PTR_BUCKET_POS_OFFSET(c, &p.ptr, &bucket_offset);
56 *bp = (struct bch_backpointer) {
59 .data_type = data_type,
60 .bucket_offset = ((u64) bucket_offset << MAX_EXTENT_COMPRESS_RATIO_SHIFT) +
62 .bucket_len = ptr_disk_sectors(sectors, p),
67 static bool extent_matches_bp(struct bch_fs *c,
68 enum btree_id btree_id, unsigned level,
71 struct bch_backpointer bp)
73 struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
74 const union bch_extent_entry *entry;
75 struct extent_ptr_decoded p;
77 bkey_for_each_ptr_decode(k.k, ptrs, p, entry) {
79 struct bch_backpointer bp2;
84 bch2_extent_ptr_to_bp(c, btree_id, level, k, p,
86 if (!bpos_cmp(bucket, bucket2) &&
87 !memcmp(&bp, &bp2, sizeof(bp)))
94 int bch2_backpointer_invalid(const struct bch_fs *c, struct bkey_s_c k,
95 int rw, struct printbuf *err)
97 struct bkey_s_c_backpointer bp = bkey_s_c_to_backpointer(k);
98 struct bpos bucket = bp_pos_to_bucket(c, bp.k->p);
100 if (bkey_val_bytes(bp.k) < sizeof(*bp.v)) {
101 prt_str(err, "incorrect value size");
105 if (bpos_cmp(bp.k->p, bucket_pos_to_bp(c, bucket, bp.v->bucket_offset))) {
106 prt_str(err, "backpointer at wrong pos");
113 void bch2_backpointer_to_text(struct printbuf *out, const struct bch_backpointer *bp)
115 prt_printf(out, "btree=%s l=%u offset=%llu:%u len=%u pos=",
116 bch2_btree_ids[bp->btree_id],
118 (u64) (bp->bucket_offset >> MAX_EXTENT_COMPRESS_RATIO_SHIFT),
119 (u32) bp->bucket_offset & ~(~0U << MAX_EXTENT_COMPRESS_RATIO_SHIFT),
121 bch2_bpos_to_text(out, bp->pos);
124 void bch2_backpointer_k_to_text(struct printbuf *out, struct bch_fs *c, struct bkey_s_c k)
126 bch2_backpointer_to_text(out, bkey_s_c_to_backpointer(k).v);
129 void bch2_backpointer_swab(struct bkey_s k)
131 struct bkey_s_backpointer bp = bkey_s_to_backpointer(k);
133 bp.v->bucket_offset = swab32(bp.v->bucket_offset);
134 bp.v->bucket_len = swab32(bp.v->bucket_len);
135 bch2_bpos_swab(&bp.v->pos);
138 #define BACKPOINTER_OFFSET_MAX ((1ULL << 40) - 1)
140 static inline int backpointer_cmp(struct bch_backpointer l, struct bch_backpointer r)
142 return cmp_int(l.bucket_offset, r.bucket_offset);
145 static int bch2_backpointer_del_by_offset(struct btree_trans *trans,
148 struct bch_backpointer bp)
150 struct bch_fs *c = trans->c;
151 struct btree_iter iter;
155 if (bp_offset < BACKPOINTER_OFFSET_MAX) {
156 struct bch_backpointer *bps;
157 struct bkey_i_alloc_v4 *a;
160 bch2_trans_iter_init(trans, &iter, BTREE_ID_alloc,
164 BTREE_ITER_WITH_UPDATES);
165 k = bch2_btree_iter_peek_slot(&iter);
170 if (k.k->type != KEY_TYPE_alloc_v4) {
175 a = bch2_alloc_to_v4_mut(trans, k);
176 ret = PTR_ERR_OR_ZERO(a);
179 bps = alloc_v4_backpointers(&a->v);
180 nr = BCH_ALLOC_V4_NR_BACKPOINTERS(&a->v);
182 for (i = 0; i < nr; i++) {
183 if (bps[i].bucket_offset == bp_offset)
185 if (bps[i].bucket_offset > bp_offset)
192 if (memcmp(&bps[i], &bp, sizeof(bp))) {
196 array_remove_item(bps, nr, i);
197 SET_BCH_ALLOC_V4_NR_BACKPOINTERS(&a->v, nr);
198 set_alloc_v4_u64s(a);
199 ret = bch2_trans_update(trans, &iter, &a->k_i, 0);
201 bp_offset -= BACKPOINTER_OFFSET_MAX;
203 bch2_trans_iter_init(trans, &iter, BTREE_ID_backpointers,
204 bucket_pos_to_bp(c, bucket, bp_offset),
207 BTREE_ITER_WITH_UPDATES);
208 k = bch2_btree_iter_peek_slot(&iter);
213 if (k.k->type != KEY_TYPE_backpointer ||
214 memcmp(bkey_s_c_to_backpointer(k).v, &bp, sizeof(bp))) {
219 ret = bch2_btree_delete_at(trans, &iter, 0);
222 bch2_trans_iter_exit(trans, &iter);
226 int bch2_bucket_backpointer_del(struct btree_trans *trans,
227 struct bkey_i_alloc_v4 *a,
228 struct bch_backpointer bp,
229 struct bkey_s_c orig_k)
231 struct bch_fs *c = trans->c;
232 struct bch_backpointer *bps = alloc_v4_backpointers(&a->v);
233 unsigned i, nr = BCH_ALLOC_V4_NR_BACKPOINTERS(&a->v);
234 struct btree_iter bp_iter;
238 for (i = 0; i < nr; i++) {
239 int cmp = backpointer_cmp(bps[i], bp) ?:
240 memcmp(&bps[i], &bp, sizeof(bp));
249 array_remove_item(bps, nr, i);
250 SET_BCH_ALLOC_V4_NR_BACKPOINTERS(&a->v, nr);
251 set_alloc_v4_u64s(a);
254 bch2_trans_iter_init(trans, &bp_iter, BTREE_ID_backpointers,
255 bucket_pos_to_bp(c, a->k.p, bp.bucket_offset),
258 BTREE_ITER_WITH_UPDATES);
259 k = bch2_btree_iter_peek_slot(&bp_iter);
264 if (k.k->type != KEY_TYPE_backpointer ||
265 memcmp(bkey_s_c_to_backpointer(k).v, &bp, sizeof(bp))) {
266 struct printbuf buf = PRINTBUF;
268 prt_printf(&buf, "backpointer not found when deleting");
270 printbuf_indent_add(&buf, 2);
272 prt_printf(&buf, "searching for ");
273 bch2_backpointer_to_text(&buf, &bp);
276 prt_printf(&buf, "got ");
277 bch2_bkey_val_to_text(&buf, c, k);
280 prt_str(&buf, "alloc ");
281 bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(&a->k_i));
284 prt_printf(&buf, "for ");
285 bch2_bkey_val_to_text(&buf, c, orig_k);
287 if (!test_bit(BCH_FS_CHECK_BACKPOINTERS_DONE, &c->flags)) {
288 bch_err(c, "%s", buf.buf);
291 bch2_trans_inconsistent(trans, "%s", buf.buf);
297 ret = bch2_btree_delete_at(trans, &bp_iter, 0);
299 bch2_trans_iter_exit(trans, &bp_iter);
303 int bch2_bucket_backpointer_add(struct btree_trans *trans,
304 struct bkey_i_alloc_v4 *a,
305 struct bch_backpointer bp,
306 struct bkey_s_c orig_k)
308 struct bch_fs *c = trans->c;
310 struct bch_backpointer *bps = alloc_v4_backpointers(&a->v);
311 unsigned i, nr = BCH_ALLOC_V4_NR_BACKPOINTERS(&a->v);
312 struct bkey_i_backpointer *bp_k;
313 struct btree_iter bp_iter;
317 /* Check for duplicates: */
318 for (i = 0; i < nr; i++) {
319 int cmp = backpointer_cmp(bps[i], bp);
325 (bps[i - 1].bucket_offset +
326 bps[i - 1].bucket_len > bp.bucket_offset)) ||
328 (bp.bucket_offset + bp.bucket_len > bps[i].bucket_offset))) {
329 struct printbuf buf = PRINTBUF;
331 prt_printf(&buf, "overlapping backpointer found when inserting ");
332 bch2_backpointer_to_text(&buf, &bp);
334 printbuf_indent_add(&buf, 2);
336 prt_printf(&buf, "into ");
337 bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(&a->k_i));
340 prt_printf(&buf, "for ");
341 bch2_bkey_val_to_text(&buf, c, orig_k);
343 if (!test_bit(BCH_FS_CHECK_BACKPOINTERS_DONE, &c->flags))
344 bch_err(c, "%s", buf.buf);
346 bch2_trans_inconsistent(trans, "%s", buf.buf);
352 if (nr < BCH_ALLOC_V4_NR_BACKPOINTERS_MAX) {
353 array_insert_item(bps, nr, i, bp);
354 SET_BCH_ALLOC_V4_NR_BACKPOINTERS(&a->v, nr);
355 set_alloc_v4_u64s(a);
359 /* Overflow: use backpointer btree */
360 bp_k = bch2_trans_kmalloc(trans, sizeof(*bp_k));
361 ret = PTR_ERR_OR_ZERO(bp_k);
365 ca = bch_dev_bkey_exists(c, a->k.p.inode);
367 bkey_backpointer_init(&bp_k->k_i);
368 bp_k->k.p = bucket_pos_to_bp(c, a->k.p, bp.bucket_offset);
371 bch2_trans_iter_init(trans, &bp_iter, BTREE_ID_backpointers, bp_k->k.p,
374 BTREE_ITER_WITH_UPDATES);
375 k = bch2_btree_iter_peek_slot(&bp_iter);
381 struct printbuf buf = PRINTBUF;
383 prt_printf(&buf, "existing btree backpointer key found when inserting ");
384 bch2_backpointer_to_text(&buf, &bp);
386 printbuf_indent_add(&buf, 2);
388 prt_printf(&buf, "found ");
389 bch2_bkey_val_to_text(&buf, c, k);
392 prt_printf(&buf, "for ");
393 bch2_bkey_val_to_text(&buf, c, orig_k);
395 if (!test_bit(BCH_FS_CHECK_BACKPOINTERS_DONE, &c->flags))
396 bch_err(c, "%s", buf.buf);
398 bch2_trans_inconsistent(trans, "%s", buf.buf);
405 ret = bch2_trans_update(trans, &bp_iter, &bp_k->k_i, 0);
407 bch2_trans_iter_exit(trans, &bp_iter);
412 * Find the next backpointer >= *bp_offset:
414 int bch2_get_next_backpointer(struct btree_trans *trans,
415 struct bpos bucket, int gen,
417 struct bch_backpointer *dst)
419 struct bch_fs *c = trans->c;
420 struct bpos bp_pos, bp_end_pos;
421 struct btree_iter alloc_iter, bp_iter = { NULL };
423 struct bkey_s_c_alloc_v4 a;
427 if (*bp_offset == U64_MAX)
430 bp_pos = bucket_pos_to_bp(c, bucket,
431 max(*bp_offset, BACKPOINTER_OFFSET_MAX) - BACKPOINTER_OFFSET_MAX);
432 bp_end_pos = bucket_pos_to_bp(c, bpos_nosnap_successor(bucket), 0);
434 bch2_trans_iter_init(trans, &alloc_iter, BTREE_ID_alloc,
435 bucket, BTREE_ITER_CACHED);
436 k = bch2_btree_iter_peek_slot(&alloc_iter);
441 if (k.k->type != KEY_TYPE_alloc_v4)
444 a = bkey_s_c_to_alloc_v4(k);
445 if (gen >= 0 && a.v->gen != gen)
448 for (i = 0; i < BCH_ALLOC_V4_NR_BACKPOINTERS(a.v); i++) {
449 if (alloc_v4_backpointers_c(a.v)[i].bucket_offset < *bp_offset)
452 *dst = alloc_v4_backpointers_c(a.v)[i];
453 *bp_offset = dst->bucket_offset;
457 for_each_btree_key_norestart(trans, bp_iter, BTREE_ID_backpointers,
459 if (bpos_cmp(k.k->p, bp_end_pos) >= 0)
462 if (k.k->type != KEY_TYPE_backpointer)
465 *dst = *bkey_s_c_to_backpointer(k).v;
466 *bp_offset = dst->bucket_offset + BACKPOINTER_OFFSET_MAX;
470 *bp_offset = U64_MAX;
472 bch2_trans_iter_exit(trans, &bp_iter);
473 bch2_trans_iter_exit(trans, &alloc_iter);
477 static void backpointer_not_found(struct btree_trans *trans,
480 struct bch_backpointer bp,
482 const char *thing_it_points_to)
484 struct bch_fs *c = trans->c;
485 struct printbuf buf = PRINTBUF;
487 prt_printf(&buf, "backpointer doesn't match %s it points to:\n ",
489 prt_printf(&buf, "bucket: ");
490 bch2_bpos_to_text(&buf, bucket);
491 prt_printf(&buf, "\n ");
493 if (bp_offset >= BACKPOINTER_OFFSET_MAX) {
495 bucket_pos_to_bp(c, bucket,
496 bp_offset - BACKPOINTER_OFFSET_MAX);
497 prt_printf(&buf, "backpointer pos: ");
498 bch2_bpos_to_text(&buf, bp_pos);
499 prt_printf(&buf, "\n ");
502 bch2_backpointer_to_text(&buf, &bp);
503 prt_printf(&buf, "\n ");
504 bch2_bkey_val_to_text(&buf, c, k);
505 if (!test_bit(BCH_FS_CHECK_BACKPOINTERS_DONE, &c->flags))
506 bch_err_ratelimited(c, "%s", buf.buf);
508 bch2_trans_inconsistent(trans, "%s", buf.buf);
513 struct bkey_s_c bch2_backpointer_get_key(struct btree_trans *trans,
514 struct btree_iter *iter,
517 struct bch_backpointer bp)
519 struct bch_fs *c = trans->c;
522 bch2_trans_node_iter_init(trans, iter,
526 min(bp.level, c->btree_roots[bp.btree_id].level),
528 k = bch2_btree_iter_peek_slot(iter);
530 bch2_trans_iter_exit(trans, iter);
534 if (bp.level == c->btree_roots[bp.btree_id].level + 1)
535 k = bkey_i_to_s_c(&c->btree_roots[bp.btree_id].key);
537 if (extent_matches_bp(c, bp.btree_id, bp.level, k, bucket, bp))
540 bch2_trans_iter_exit(trans, iter);
546 * If a backpointer for a btree node wasn't found, it may be
547 * because it was overwritten by a new btree node that hasn't
548 * been written out yet - backpointer_get_node() checks for
551 b = bch2_backpointer_get_node(trans, iter, bucket, bp_offset, bp);
552 if (!IS_ERR_OR_NULL(b))
553 return bkey_i_to_s_c(&b->key);
555 bch2_trans_iter_exit(trans, iter);
558 return bkey_s_c_err(PTR_ERR(b));
559 return bkey_s_c_null;
562 backpointer_not_found(trans, bucket, bp_offset, bp, k, "extent");
563 return bkey_s_c_null;
566 struct btree *bch2_backpointer_get_node(struct btree_trans *trans,
567 struct btree_iter *iter,
570 struct bch_backpointer bp)
572 struct bch_fs *c = trans->c;
577 bch2_trans_node_iter_init(trans, iter,
583 b = bch2_btree_iter_peek_node(iter);
587 if (extent_matches_bp(c, bp.btree_id, bp.level,
588 bkey_i_to_s_c(&b->key),
592 if (btree_node_will_make_reachable(b)) {
593 b = ERR_PTR(-BCH_ERR_backpointer_to_overwritten_btree_node);
595 backpointer_not_found(trans, bucket, bp_offset, bp,
596 bkey_i_to_s_c(&b->key), "btree node");
600 bch2_trans_iter_exit(trans, iter);
604 static int bch2_check_btree_backpointer(struct btree_trans *trans, struct btree_iter *bp_iter,
607 struct bch_fs *c = trans->c;
608 struct btree_iter alloc_iter = { NULL };
610 struct bkey_s_c alloc_k;
611 struct printbuf buf = PRINTBUF;
614 if (fsck_err_on(!bch2_dev_exists2(c, k.k->p.inode), c,
615 "backpointer for mising device:\n%s",
616 (bch2_bkey_val_to_text(&buf, c, k), buf.buf))) {
617 ret = bch2_btree_delete_at(trans, bp_iter, 0);
621 ca = bch_dev_bkey_exists(c, k.k->p.inode);
623 bch2_trans_iter_init(trans, &alloc_iter, BTREE_ID_alloc,
624 bp_pos_to_bucket(c, k.k->p), 0);
626 alloc_k = bch2_btree_iter_peek_slot(&alloc_iter);
627 ret = bkey_err(alloc_k);
631 if (fsck_err_on(alloc_k.k->type != KEY_TYPE_alloc_v4, c,
632 "backpointer for nonexistent alloc key: %llu:%llu:0\n%s",
633 alloc_iter.pos.inode, alloc_iter.pos.offset,
634 (bch2_bkey_val_to_text(&buf, c, alloc_k), buf.buf))) {
635 ret = bch2_btree_delete_at(trans, bp_iter, 0);
640 bch2_trans_iter_exit(trans, &alloc_iter);
645 /* verify that every backpointer has a corresponding alloc key */
646 int bch2_check_btree_backpointers(struct bch_fs *c)
648 struct btree_iter iter;
651 return bch2_trans_run(c,
652 for_each_btree_key_commit(&trans, iter,
653 BTREE_ID_backpointers, POS_MIN, 0, k,
654 NULL, NULL, BTREE_INSERT_LAZY_RW|BTREE_INSERT_NOFAIL,
655 bch2_check_btree_backpointer(&trans, &iter, k)));
658 static int check_bp_exists(struct btree_trans *trans,
659 struct bpos bucket_pos,
660 struct bch_backpointer bp,
661 struct bkey_s_c orig_k)
663 struct bch_fs *c = trans->c;
664 struct btree_iter alloc_iter, bp_iter = { NULL };
665 struct printbuf buf = PRINTBUF;
666 struct bkey_s_c alloc_k, bp_k;
669 bch2_trans_iter_init(trans, &alloc_iter, BTREE_ID_alloc, bucket_pos, 0);
670 alloc_k = bch2_btree_iter_peek_slot(&alloc_iter);
671 ret = bkey_err(alloc_k);
675 if (alloc_k.k->type == KEY_TYPE_alloc_v4) {
676 struct bkey_s_c_alloc_v4 a = bkey_s_c_to_alloc_v4(alloc_k);
677 const struct bch_backpointer *bps = alloc_v4_backpointers_c(a.v);
678 unsigned i, nr = BCH_ALLOC_V4_NR_BACKPOINTERS(a.v);
680 for (i = 0; i < nr; i++) {
681 int cmp = backpointer_cmp(bps[i], bp) ?:
682 memcmp(&bps[i], &bp, sizeof(bp));
692 bch2_trans_iter_init(trans, &bp_iter, BTREE_ID_backpointers,
693 bucket_pos_to_bp(c, bucket_pos, bp.bucket_offset),
695 bp_k = bch2_btree_iter_peek_slot(&bp_iter);
696 ret = bkey_err(bp_k);
700 if (bp_k.k->type != KEY_TYPE_backpointer ||
701 memcmp(bkey_s_c_to_backpointer(bp_k).v, &bp, sizeof(bp)))
706 bch2_trans_iter_exit(trans, &bp_iter);
707 bch2_trans_iter_exit(trans, &alloc_iter);
711 prt_printf(&buf, "missing backpointer for btree=%s l=%u ",
712 bch2_btree_ids[bp.btree_id], bp.level);
713 bch2_bkey_val_to_text(&buf, c, orig_k);
714 prt_printf(&buf, "\nin alloc key ");
715 bch2_bkey_val_to_text(&buf, c, alloc_k);
717 if (c->sb.version < bcachefs_metadata_version_backpointers ||
718 c->opts.reconstruct_alloc ||
719 fsck_err(c, "%s", buf.buf)) {
720 struct bkey_i_alloc_v4 *a = bch2_alloc_to_v4_mut(trans, alloc_k);
722 ret = PTR_ERR_OR_ZERO(a) ?:
723 bch2_bucket_backpointer_add(trans, a, bp, orig_k) ?:
724 bch2_trans_update(trans, &alloc_iter, &a->k_i, 0);
730 static int check_extent_to_backpointers(struct btree_trans *trans,
731 struct btree_iter *iter)
733 struct bch_fs *c = trans->c;
734 struct bkey_ptrs_c ptrs;
735 const union bch_extent_entry *entry;
736 struct extent_ptr_decoded p;
740 k = bch2_btree_iter_peek_all_levels(iter);
747 ptrs = bch2_bkey_ptrs_c(k);
748 bkey_for_each_ptr_decode(k.k, ptrs, p, entry) {
749 struct bpos bucket_pos;
750 struct bch_backpointer bp;
755 bch2_extent_ptr_to_bp(c, iter->btree_id, iter->path->level,
756 k, p, &bucket_pos, &bp);
758 ret = check_bp_exists(trans, bucket_pos, bp, k);
766 static int check_btree_root_to_backpointers(struct btree_trans *trans,
767 enum btree_id btree_id)
769 struct bch_fs *c = trans->c;
770 struct btree_iter iter;
773 struct bkey_ptrs_c ptrs;
774 struct extent_ptr_decoded p;
775 const union bch_extent_entry *entry;
778 bch2_trans_node_iter_init(trans, &iter, btree_id, POS_MIN, 0,
779 c->btree_roots[btree_id].level, 0);
780 b = bch2_btree_iter_peek_node(&iter);
781 ret = PTR_ERR_OR_ZERO(b);
785 BUG_ON(b != btree_node_root(c, b));
787 k = bkey_i_to_s_c(&b->key);
788 ptrs = bch2_bkey_ptrs_c(k);
789 bkey_for_each_ptr_decode(k.k, ptrs, p, entry) {
790 struct bpos bucket_pos;
791 struct bch_backpointer bp;
796 bch2_extent_ptr_to_bp(c, iter.btree_id, iter.path->level + 1,
797 k, p, &bucket_pos, &bp);
799 ret = check_bp_exists(trans, bucket_pos, bp, k);
804 bch2_trans_iter_exit(trans, &iter);
808 static inline struct bbpos bp_to_bbpos(struct bch_backpointer bp)
810 return (struct bbpos) {
811 .btree = bp.btree_id,
816 static size_t btree_nodes_fit_in_ram(struct bch_fs *c)
821 return (i.totalram >> 1) / btree_bytes(c);
824 int bch2_get_btree_in_memory_pos(struct btree_trans *trans,
825 unsigned btree_leaf_mask,
826 unsigned btree_interior_mask,
827 struct bbpos start, struct bbpos *end)
829 struct btree_iter iter;
831 size_t btree_nodes = btree_nodes_fit_in_ram(trans->c);
835 for (btree = start.btree; btree < BTREE_ID_NR && !ret; btree++) {
836 unsigned depth = ((1U << btree) & btree_leaf_mask) ? 1 : 2;
838 if (!((1U << btree) & btree_leaf_mask) &&
839 !((1U << btree) & btree_interior_mask))
842 bch2_trans_node_iter_init(trans, &iter, btree,
843 btree == start.btree ? start.pos : POS_MIN,
846 * for_each_btree_key_contineu() doesn't check the return value
847 * from bch2_btree_iter_advance(), which is needed when
848 * iterating over interior nodes where we'll see keys at
852 k = __bch2_btree_iter_peek_and_restart(trans, &iter, 0);
859 *end = BBPOS(btree, k.k->p);
860 bch2_trans_iter_exit(trans, &iter);
863 } while (bch2_btree_iter_advance(&iter));
864 bch2_trans_iter_exit(trans, &iter);
871 int bch2_check_extents_to_backpointers(struct bch_fs *c)
873 struct btree_trans trans;
874 struct btree_iter iter;
875 enum btree_id btree_id;
878 bch2_trans_init(&trans, c, 0, 0);
879 for (btree_id = 0; btree_id < BTREE_ID_NR; btree_id++) {
880 unsigned depth = btree_type_has_ptrs(btree_id) ? 0 : 1;
882 bch2_trans_node_iter_init(&trans, &iter, btree_id, POS_MIN, 0,
884 BTREE_ITER_ALL_LEVELS|
885 BTREE_ITER_PREFETCH);
888 ret = commit_do(&trans, NULL, NULL,
889 BTREE_INSERT_LAZY_RW|
891 check_extent_to_backpointers(&trans, &iter));
894 } while (!bch2_btree_iter_advance(&iter));
896 bch2_trans_iter_exit(&trans, &iter);
901 ret = commit_do(&trans, NULL, NULL,
902 BTREE_INSERT_LAZY_RW|
904 check_btree_root_to_backpointers(&trans, btree_id));
908 bch2_trans_exit(&trans);
912 static int check_one_backpointer(struct btree_trans *trans,
918 struct btree_iter iter;
919 struct bch_backpointer bp;
922 struct printbuf buf = PRINTBUF;
925 ret = bch2_get_next_backpointer(trans, bucket, -1, bp_offset, &bp);
926 if (ret || *bp_offset == U64_MAX)
929 pos = bp_to_bbpos(bp);
930 if (bbpos_cmp(pos, start) < 0 ||
931 bbpos_cmp(pos, end) > 0)
934 k = bch2_backpointer_get_key(trans, &iter, bucket, *bp_offset, bp);
936 if (ret == -BCH_ERR_backpointer_to_overwritten_btree_node)
941 if (fsck_err_on(!k.k, trans->c,
942 "%s backpointer points to missing extent\n%s",
943 *bp_offset < BACKPOINTER_OFFSET_MAX ? "alloc" : "btree",
944 (bch2_backpointer_to_text(&buf, &bp), buf.buf))) {
945 ret = bch2_backpointer_del_by_offset(trans, bucket, *bp_offset, bp);
947 bch_err(trans->c, "backpointer at %llu not found", *bp_offset);
950 bch2_trans_iter_exit(trans, &iter);
956 static int bch2_check_backpointers_to_extents_pass(struct btree_trans *trans,
960 struct btree_iter iter;
964 for_each_btree_key(trans, iter, BTREE_ID_alloc, POS_MIN,
965 BTREE_ITER_PREFETCH, k, ret) {
968 while (!(ret = commit_do(trans, NULL, NULL,
969 BTREE_INSERT_LAZY_RW|
971 check_one_backpointer(trans, iter.pos, &bp_offset, start, end))) &&
978 bch2_trans_iter_exit(trans, &iter);
979 return ret < 0 ? ret : 0;
982 int bch2_check_backpointers_to_extents(struct bch_fs *c)
984 struct btree_trans trans;
985 struct bbpos start = (struct bbpos) { .btree = 0, .pos = POS_MIN, }, end;
988 bch2_trans_init(&trans, c, 0, 0);
990 ret = bch2_get_btree_in_memory_pos(&trans,
991 (1U << BTREE_ID_extents)|
992 (1U << BTREE_ID_reflink),
998 if (!bbpos_cmp(start, BBPOS_MIN) &&
999 bbpos_cmp(end, BBPOS_MAX))
1000 bch_verbose(c, "check_backpointers_to_extents(): extents do not fit in ram,"
1001 "running in multiple passes with %zu nodes per pass",
1002 btree_nodes_fit_in_ram(c));
1004 if (bbpos_cmp(start, BBPOS_MIN) ||
1005 bbpos_cmp(end, BBPOS_MAX)) {
1006 struct printbuf buf = PRINTBUF;
1008 prt_str(&buf, "check_backointers_to_extents(): ");
1009 bch2_bbpos_to_text(&buf, start);
1011 bch2_bbpos_to_text(&buf, end);
1013 bch_verbose(c, "%s", buf.buf);
1014 printbuf_exit(&buf);
1017 ret = bch2_check_backpointers_to_extents_pass(&trans, start, end);
1018 if (ret || !bbpos_cmp(end, BBPOS_MAX))
1021 start = bbpos_successor(end);
1023 bch2_trans_exit(&trans);