4 #include "bkey_methods.h"
5 #include "btree_cache.h"
7 #include "btree_update.h"
8 #include "btree_update_interior.h"
10 #include "btree_iter.h"
11 #include "btree_locking.h"
15 #include "journal_reclaim.h"
20 #include <linux/random.h>
21 #include <trace/events/bcachefs.h>
23 static void btree_node_will_make_reachable(struct btree_update *,
25 static void btree_update_drop_new_node(struct bch_fs *, struct btree *);
26 static void bch2_btree_set_root_ondisk(struct bch_fs *, struct btree *, int);
30 static void btree_node_interior_verify(struct btree *b)
32 struct btree_node_iter iter;
33 struct bkey_packed *k;
37 bch2_btree_node_iter_init(&iter, b, b->key.k.p, false, false);
39 BUG_ON(!(k = bch2_btree_node_iter_peek(&iter, b)) ||
40 bkey_cmp_left_packed(b, k, &b->key.k.p));
42 BUG_ON((bch2_btree_node_iter_advance(&iter, b),
43 !bch2_btree_node_iter_end(&iter)));
48 k = bch2_btree_node_iter_peek(&iter, b);
52 msg = "isn't what it should be";
53 if (bkey_cmp_left_packed(b, k, &b->key.k.p))
56 bch2_btree_node_iter_advance(&iter, b);
58 msg = "isn't last key";
59 if (!bch2_btree_node_iter_end(&iter))
63 bch2_dump_btree_node(b);
64 printk(KERN_ERR "last key %llu:%llu %s\n", b->key.k.p.inode,
65 b->key.k.p.offset, msg);
70 /* Calculate ideal packed bkey format for new btree nodes: */
72 void __bch2_btree_calc_format(struct bkey_format_state *s, struct btree *b)
74 struct bkey_packed *k;
78 bch2_bkey_format_add_pos(s, b->data->min_key);
81 for (k = btree_bkey_first(b, t);
82 k != btree_bkey_last(b, t);
84 if (!bkey_whiteout(k)) {
85 uk = bkey_unpack_key(b, k);
86 bch2_bkey_format_add_key(s, &uk);
90 static struct bkey_format bch2_btree_calc_format(struct btree *b)
92 struct bkey_format_state s;
94 bch2_bkey_format_init(&s);
95 __bch2_btree_calc_format(&s, b);
97 return bch2_bkey_format_done(&s);
100 static size_t btree_node_u64s_with_format(struct btree *b,
101 struct bkey_format *new_f)
103 struct bkey_format *old_f = &b->format;
105 /* stupid integer promotion rules */
107 (((int) new_f->key_u64s - old_f->key_u64s) *
108 (int) b->nr.packed_keys) +
109 (((int) new_f->key_u64s - BKEY_U64s) *
110 (int) b->nr.unpacked_keys);
112 BUG_ON(delta + b->nr.live_u64s < 0);
114 return b->nr.live_u64s + delta;
118 * btree_node_format_fits - check if we could rewrite node with a new format
120 * This assumes all keys can pack with the new format -- it just checks if
121 * the re-packed keys would fit inside the node itself.
123 bool bch2_btree_node_format_fits(struct bch_fs *c, struct btree *b,
124 struct bkey_format *new_f)
126 size_t u64s = btree_node_u64s_with_format(b, new_f);
128 return __vstruct_bytes(struct btree_node, u64s) < btree_bytes(c);
131 /* Btree node freeing/allocation: */
133 static bool btree_key_matches(struct bch_fs *c,
134 struct bkey_s_c_extent l,
135 struct bkey_s_c_extent r)
137 const struct bch_extent_ptr *ptr1, *ptr2;
139 extent_for_each_ptr(l, ptr1)
140 extent_for_each_ptr(r, ptr2)
141 if (ptr1->dev == ptr2->dev &&
142 ptr1->gen == ptr2->gen &&
143 ptr1->offset == ptr2->offset)
150 * We're doing the index update that makes @b unreachable, update stuff to
153 * Must be called _before_ btree_update_updated_root() or
154 * btree_update_updated_node:
156 static void bch2_btree_node_free_index(struct btree_update *as, struct btree *b,
158 struct bch_fs_usage *stats)
160 struct bch_fs *c = as->c;
161 struct pending_btree_node_free *d;
165 * btree_update lock is only needed here to avoid racing with
168 mutex_lock(&c->btree_interior_update_lock);
170 for (d = as->pending; d < as->pending + as->nr_pending; d++)
171 if (!bkey_cmp(k.k->p, d->key.k.p) &&
172 btree_key_matches(c, bkey_s_c_to_extent(k),
173 bkey_i_to_s_c_extent(&d->key)))
177 BUG_ON(d->index_update_done);
178 d->index_update_done = true;
181 * Btree nodes are accounted as freed in bch_alloc_stats when they're
182 * freed from the index:
184 replicas = bch2_extent_nr_dirty_ptrs(k);
186 stats->s[replicas - 1].data[S_META] -= c->opts.btree_node_size;
189 * We're dropping @k from the btree, but it's still live until the
190 * index update is persistent so we need to keep a reference around for
191 * mark and sweep to find - that's primarily what the
192 * btree_node_pending_free list is for.
194 * So here (when we set index_update_done = true), we're moving an
195 * existing reference to a different part of the larger "gc keyspace" -
196 * and the new position comes after the old position, since GC marks
197 * the pending free list after it walks the btree.
199 * If we move the reference while mark and sweep is _between_ the old
200 * and the new position, mark and sweep will see the reference twice
201 * and it'll get double accounted - so check for that here and subtract
202 * to cancel out one of mark and sweep's markings if necessary:
206 * bch2_mark_key() compares the current gc pos to the pos we're
207 * moving this reference from, hence one comparison here:
209 if (gc_pos_cmp(c->gc_pos, gc_phase(GC_PHASE_PENDING_DELETE)) < 0) {
210 struct bch_fs_usage tmp = { 0 };
212 bch2_mark_key(c, bkey_i_to_s_c(&d->key),
213 -c->opts.btree_node_size, true, b
214 ? gc_pos_btree_node(b)
215 : gc_pos_btree_root(as->btree_id),
218 * Don't apply tmp - pending deletes aren't tracked in
223 mutex_unlock(&c->btree_interior_update_lock);
226 static void __btree_node_free(struct bch_fs *c, struct btree *b)
228 trace_btree_node_free(c, b);
230 BUG_ON(btree_node_dirty(b));
231 BUG_ON(btree_node_need_write(b));
232 BUG_ON(b == btree_node_root(c, b));
234 BUG_ON(!list_empty(&b->write_blocked));
235 BUG_ON(b->will_make_reachable);
237 clear_btree_node_noevict(b);
239 bch2_btree_node_hash_remove(&c->btree_cache, b);
241 mutex_lock(&c->btree_cache.lock);
242 list_move(&b->list, &c->btree_cache.freeable);
243 mutex_unlock(&c->btree_cache.lock);
246 void bch2_btree_node_free_never_inserted(struct bch_fs *c, struct btree *b)
248 struct btree_ob_ref ob = b->ob;
250 btree_update_drop_new_node(c, b);
254 clear_btree_node_dirty(b);
256 btree_node_lock_type(c, b, SIX_LOCK_write);
257 __btree_node_free(c, b);
258 six_unlock_write(&b->lock);
260 bch2_open_bucket_put_refs(c, &ob.nr, ob.refs);
263 void bch2_btree_node_free_inmem(struct bch_fs *c, struct btree *b,
264 struct btree_iter *iter)
267 * Is this a node that isn't reachable on disk yet?
269 * Nodes that aren't reachable yet have writes blocked until they're
270 * reachable - now that we've cancelled any pending writes and moved
271 * things waiting on that write to wait on this update, we can drop this
272 * node from the list of nodes that the other update is making
273 * reachable, prior to freeing it:
275 btree_update_drop_new_node(c, b);
277 __bch2_btree_node_lock_write(b, iter);
278 __btree_node_free(c, b);
279 six_unlock_write(&b->lock);
281 bch2_btree_iter_node_drop(iter, b);
284 static void bch2_btree_node_free_ondisk(struct bch_fs *c,
285 struct pending_btree_node_free *pending)
287 struct bch_fs_usage stats = { 0 };
289 BUG_ON(!pending->index_update_done);
291 bch2_mark_key(c, bkey_i_to_s_c(&pending->key),
292 -c->opts.btree_node_size, true,
293 gc_phase(GC_PHASE_PENDING_DELETE),
296 * Don't apply stats - pending deletes aren't tracked in
301 void bch2_btree_open_bucket_put(struct bch_fs *c, struct btree *b)
303 bch2_open_bucket_put_refs(c, &b->ob.nr, b->ob.refs);
306 static struct btree *__bch2_btree_node_alloc(struct bch_fs *c,
307 struct disk_reservation *res,
311 struct write_point *wp;
314 struct bkey_i_extent *e;
315 struct btree_ob_ref ob;
316 struct bch_devs_list devs_have = (struct bch_devs_list) { 0 };
318 enum alloc_reserve alloc_reserve;
320 if (flags & BTREE_INSERT_USE_ALLOC_RESERVE) {
322 alloc_reserve = RESERVE_ALLOC;
323 } else if (flags & BTREE_INSERT_USE_RESERVE) {
324 nr_reserve = BTREE_NODE_RESERVE / 2;
325 alloc_reserve = RESERVE_BTREE;
327 nr_reserve = BTREE_NODE_RESERVE;
328 alloc_reserve = RESERVE_NONE;
331 mutex_lock(&c->btree_reserve_cache_lock);
332 if (c->btree_reserve_cache_nr > nr_reserve) {
333 struct btree_alloc *a =
334 &c->btree_reserve_cache[--c->btree_reserve_cache_nr];
337 bkey_copy(&tmp.k, &a->k);
338 mutex_unlock(&c->btree_reserve_cache_lock);
341 mutex_unlock(&c->btree_reserve_cache_lock);
344 wp = bch2_alloc_sectors_start(c, c->opts.foreground_target,
345 writepoint_ptr(&c->btree_write_point),
348 c->opts.metadata_replicas_required,
349 alloc_reserve, 0, cl);
353 if (wp->sectors_free < c->opts.btree_node_size) {
354 struct open_bucket *ob;
357 writepoint_for_each_ptr(wp, ob, i)
358 if (ob->sectors_free < c->opts.btree_node_size)
359 ob->sectors_free = 0;
361 bch2_alloc_sectors_done(c, wp);
365 e = bkey_extent_init(&tmp.k);
366 bch2_alloc_sectors_append_ptrs(c, wp, e, c->opts.btree_node_size);
369 bch2_open_bucket_get(c, wp, &ob.nr, ob.refs);
370 bch2_alloc_sectors_done(c, wp);
372 b = bch2_btree_node_mem_alloc(c);
374 /* we hold cannibalize_lock: */
378 bkey_copy(&b->key, &tmp.k);
384 static struct btree *bch2_btree_node_alloc(struct btree_update *as, unsigned level)
386 struct bch_fs *c = as->c;
389 BUG_ON(level >= BTREE_MAX_DEPTH);
390 BUG_ON(!as->reserve->nr);
392 b = as->reserve->b[--as->reserve->nr];
394 BUG_ON(bch2_btree_node_hash_insert(&c->btree_cache, b, level, as->btree_id));
396 set_btree_node_accessed(b);
397 set_btree_node_dirty(b);
399 bch2_bset_init_first(b, &b->data->keys);
400 memset(&b->nr, 0, sizeof(b->nr));
401 b->data->magic = cpu_to_le64(bset_magic(c));
403 SET_BTREE_NODE_ID(b->data, as->btree_id);
404 SET_BTREE_NODE_LEVEL(b->data, level);
405 b->data->ptr = bkey_i_to_extent(&b->key)->v.start->ptr;
407 bch2_btree_build_aux_trees(b);
409 btree_node_will_make_reachable(as, b);
411 trace_btree_node_alloc(c, b);
415 struct btree *__bch2_btree_node_alloc_replacement(struct btree_update *as,
417 struct bkey_format format)
421 n = bch2_btree_node_alloc(as, b->level);
423 n->data->min_key = b->data->min_key;
424 n->data->max_key = b->data->max_key;
425 n->data->format = format;
426 SET_BTREE_NODE_SEQ(n->data, BTREE_NODE_SEQ(b->data) + 1);
428 btree_node_set_format(n, format);
430 bch2_btree_sort_into(as->c, n, b);
432 btree_node_reset_sib_u64s(n);
434 n->key.k.p = b->key.k.p;
438 static struct btree *bch2_btree_node_alloc_replacement(struct btree_update *as,
441 struct bkey_format new_f = bch2_btree_calc_format(b);
444 * The keys might expand with the new format - if they wouldn't fit in
445 * the btree node anymore, use the old format for now:
447 if (!bch2_btree_node_format_fits(as->c, b, &new_f))
450 return __bch2_btree_node_alloc_replacement(as, b, new_f);
453 static struct btree *__btree_root_alloc(struct btree_update *as, unsigned level)
455 struct btree *b = bch2_btree_node_alloc(as, level);
457 b->data->min_key = POS_MIN;
458 b->data->max_key = POS_MAX;
459 b->data->format = bch2_btree_calc_format(b);
460 b->key.k.p = POS_MAX;
462 btree_node_set_format(b, b->data->format);
463 bch2_btree_build_aux_trees(b);
465 six_unlock_write(&b->lock);
470 static void bch2_btree_reserve_put(struct bch_fs *c, struct btree_reserve *reserve)
472 bch2_disk_reservation_put(c, &reserve->disk_res);
474 mutex_lock(&c->btree_reserve_cache_lock);
476 while (reserve->nr) {
477 struct btree *b = reserve->b[--reserve->nr];
479 six_unlock_write(&b->lock);
481 if (c->btree_reserve_cache_nr <
482 ARRAY_SIZE(c->btree_reserve_cache)) {
483 struct btree_alloc *a =
484 &c->btree_reserve_cache[c->btree_reserve_cache_nr++];
488 bkey_copy(&a->k, &b->key);
490 bch2_btree_open_bucket_put(c, b);
493 btree_node_lock_type(c, b, SIX_LOCK_write);
494 __btree_node_free(c, b);
495 six_unlock_write(&b->lock);
497 six_unlock_intent(&b->lock);
500 mutex_unlock(&c->btree_reserve_cache_lock);
502 mempool_free(reserve, &c->btree_reserve_pool);
505 static struct btree_reserve *bch2_btree_reserve_get(struct bch_fs *c,
510 struct btree_reserve *reserve;
512 struct disk_reservation disk_res = { 0, 0 };
513 unsigned sectors = nr_nodes * c->opts.btree_node_size;
514 int ret, disk_res_flags = BCH_DISK_RESERVATION_GC_LOCK_HELD;
516 if (flags & BTREE_INSERT_NOFAIL)
517 disk_res_flags |= BCH_DISK_RESERVATION_NOFAIL;
520 * This check isn't necessary for correctness - it's just to potentially
521 * prevent us from doing a lot of work that'll end up being wasted:
523 ret = bch2_journal_error(&c->journal);
527 if (bch2_disk_reservation_get(c, &disk_res, sectors,
528 c->opts.metadata_replicas,
530 return ERR_PTR(-ENOSPC);
532 BUG_ON(nr_nodes > BTREE_RESERVE_MAX);
535 * Protects reaping from the btree node cache and using the btree node
536 * open bucket reserve:
538 ret = bch2_btree_cache_cannibalize_lock(c, cl);
540 bch2_disk_reservation_put(c, &disk_res);
544 reserve = mempool_alloc(&c->btree_reserve_pool, GFP_NOIO);
546 reserve->disk_res = disk_res;
549 while (reserve->nr < nr_nodes) {
550 b = __bch2_btree_node_alloc(c, &disk_res,
551 flags & BTREE_INSERT_NOWAIT
558 ret = bch2_mark_bkey_replicas(c, BCH_DATA_BTREE,
559 bkey_i_to_s_c(&b->key));
563 reserve->b[reserve->nr++] = b;
566 bch2_btree_cache_cannibalize_unlock(c);
569 bch2_btree_reserve_put(c, reserve);
570 bch2_btree_cache_cannibalize_unlock(c);
571 trace_btree_reserve_get_fail(c, nr_nodes, cl);
575 /* Asynchronous interior node update machinery */
577 static void bch2_btree_update_free(struct btree_update *as)
579 struct bch_fs *c = as->c;
581 BUG_ON(as->nr_new_nodes);
582 BUG_ON(as->nr_pending);
585 bch2_btree_reserve_put(c, as->reserve);
587 mutex_lock(&c->btree_interior_update_lock);
590 closure_debug_destroy(&as->cl);
591 mempool_free(as, &c->btree_interior_update_pool);
592 percpu_ref_put(&c->writes);
594 closure_wake_up(&c->btree_interior_update_wait);
595 mutex_unlock(&c->btree_interior_update_lock);
598 static void btree_update_nodes_reachable(struct closure *cl)
600 struct btree_update *as = container_of(cl, struct btree_update, cl);
601 struct bch_fs *c = as->c;
603 bch2_journal_pin_drop(&c->journal, &as->journal);
605 mutex_lock(&c->btree_interior_update_lock);
607 while (as->nr_new_nodes) {
608 struct btree *b = as->new_nodes[--as->nr_new_nodes];
610 BUG_ON(b->will_make_reachable != (unsigned long) as);
611 b->will_make_reachable = 0;
612 mutex_unlock(&c->btree_interior_update_lock);
615 * b->will_make_reachable prevented it from being written, so
616 * write it now if it needs to be written:
618 btree_node_lock_type(c, b, SIX_LOCK_read);
619 bch2_btree_node_write_cond(c, b, btree_node_need_write(b));
620 six_unlock_read(&b->lock);
621 mutex_lock(&c->btree_interior_update_lock);
624 while (as->nr_pending)
625 bch2_btree_node_free_ondisk(c, &as->pending[--as->nr_pending]);
627 mutex_unlock(&c->btree_interior_update_lock);
629 closure_wake_up(&as->wait);
631 bch2_btree_update_free(as);
634 static void btree_update_wait_on_journal(struct closure *cl)
636 struct btree_update *as = container_of(cl, struct btree_update, cl);
637 struct bch_fs *c = as->c;
640 ret = bch2_journal_open_seq_async(&c->journal, as->journal_seq, cl);
644 continue_at(cl, btree_update_wait_on_journal, system_wq);
648 bch2_journal_flush_seq_async(&c->journal, as->journal_seq, cl);
650 continue_at(cl, btree_update_nodes_reachable, system_wq);
653 static void btree_update_nodes_written(struct closure *cl)
655 struct btree_update *as = container_of(cl, struct btree_update, cl);
656 struct bch_fs *c = as->c;
660 * We did an update to a parent node where the pointers we added pointed
661 * to child nodes that weren't written yet: now, the child nodes have
662 * been written so we can write out the update to the interior node.
665 mutex_lock(&c->btree_interior_update_lock);
666 as->nodes_written = true;
669 case BTREE_INTERIOR_NO_UPDATE:
671 case BTREE_INTERIOR_UPDATING_NODE:
672 /* The usual case: */
673 b = READ_ONCE(as->b);
675 if (!six_trylock_read(&b->lock)) {
676 mutex_unlock(&c->btree_interior_update_lock);
677 btree_node_lock_type(c, b, SIX_LOCK_read);
678 six_unlock_read(&b->lock);
682 BUG_ON(!btree_node_dirty(b));
683 closure_wait(&btree_current_write(b)->wait, cl);
685 list_del(&as->write_blocked_list);
686 mutex_unlock(&c->btree_interior_update_lock);
689 * b->write_blocked prevented it from being written, so
690 * write it now if it needs to be written:
692 bch2_btree_node_write_cond(c, b, true);
693 six_unlock_read(&b->lock);
696 case BTREE_INTERIOR_UPDATING_AS:
698 * The btree node we originally updated has been freed and is
699 * being rewritten - so we need to write anything here, we just
700 * need to signal to that btree_update that it's ok to make the
701 * new replacement node visible:
703 closure_put(&as->parent_as->cl);
706 * and then we have to wait on that btree_update to finish:
708 closure_wait(&as->parent_as->wait, cl);
709 mutex_unlock(&c->btree_interior_update_lock);
712 case BTREE_INTERIOR_UPDATING_ROOT:
713 /* b is the new btree root: */
714 b = READ_ONCE(as->b);
716 if (!six_trylock_read(&b->lock)) {
717 mutex_unlock(&c->btree_interior_update_lock);
718 btree_node_lock_type(c, b, SIX_LOCK_read);
719 six_unlock_read(&b->lock);
723 BUG_ON(c->btree_roots[b->btree_id].as != as);
724 c->btree_roots[b->btree_id].as = NULL;
726 bch2_btree_set_root_ondisk(c, b, WRITE);
729 * We don't have to wait anything anything here (before
730 * btree_update_nodes_reachable frees the old nodes
731 * ondisk) - we've ensured that the very next journal write will
732 * have the pointer to the new root, and before the allocator
733 * can reuse the old nodes it'll have to do a journal commit:
735 six_unlock_read(&b->lock);
736 mutex_unlock(&c->btree_interior_update_lock);
739 * Bit of funny circularity going on here we have to break:
741 * We have to drop our journal pin before writing the journal
742 * entry that points to the new btree root: else, we could
743 * deadlock if the journal currently happens to be full.
745 * This mean we're dropping the journal pin _before_ the new
746 * nodes are technically reachable - but this is safe, because
747 * after the bch2_btree_set_root_ondisk() call above they will
748 * be reachable as of the very next journal write:
750 bch2_journal_pin_drop(&c->journal, &as->journal);
752 as->journal_seq = bch2_journal_last_unwritten_seq(&c->journal);
754 btree_update_wait_on_journal(cl);
758 continue_at(cl, btree_update_nodes_reachable, system_wq);
762 * We're updating @b with pointers to nodes that haven't finished writing yet:
763 * block @b from being written until @as completes
765 static void btree_update_updated_node(struct btree_update *as, struct btree *b)
767 struct bch_fs *c = as->c;
769 mutex_lock(&c->btree_interior_update_lock);
771 BUG_ON(as->mode != BTREE_INTERIOR_NO_UPDATE);
772 BUG_ON(!btree_node_dirty(b));
774 as->mode = BTREE_INTERIOR_UPDATING_NODE;
776 list_add(&as->write_blocked_list, &b->write_blocked);
778 mutex_unlock(&c->btree_interior_update_lock);
781 * In general, when you're staging things in a journal that will later
782 * be written elsewhere, and you also want to guarantee ordering: that
783 * is, if you have updates a, b, c, after a crash you should never see c
784 * and not a or b - there's a problem:
786 * If the final destination of the update(s) (i.e. btree node) can be
787 * written/flushed _before_ the relevant journal entry - oops, that
788 * breaks ordering, since the various leaf nodes can be written in any
791 * Normally we use bset->journal_seq to deal with this - if during
792 * recovery we find a btree node write that's newer than the newest
793 * journal entry, we just ignore it - we don't need it, anything we're
794 * supposed to have (that we reported as completed via fsync()) will
795 * still be in the journal, and as far as the state of the journal is
796 * concerned that btree node write never happened.
798 * That breaks when we're rewriting/splitting/merging nodes, since we're
799 * mixing btree node writes that haven't happened yet with previously
800 * written data that has been reported as completed to the journal.
802 * Thus, before making the new nodes reachable, we have to wait the
803 * newest journal sequence number we have data for to be written (if it
806 bch2_journal_wait_on_seq(&c->journal, as->journal_seq, &as->cl);
809 static void interior_update_flush(struct journal *j,
810 struct journal_entry_pin *pin, u64 seq)
812 struct btree_update *as =
813 container_of(pin, struct btree_update, journal);
815 bch2_journal_flush_seq_async(j, as->journal_seq, NULL);
818 static void btree_update_reparent(struct btree_update *as,
819 struct btree_update *child)
821 struct bch_fs *c = as->c;
824 child->mode = BTREE_INTERIOR_UPDATING_AS;
825 child->parent_as = as;
826 closure_get(&as->cl);
829 * When we write a new btree root, we have to drop our journal pin
830 * _before_ the new nodes are technically reachable; see
831 * btree_update_nodes_written().
833 * This goes for journal pins that are recursively blocked on us - so,
834 * just transfer the journal pin to the new interior update so
835 * btree_update_nodes_written() can drop it.
837 bch2_journal_pin_add_if_older(&c->journal, &child->journal,
838 &as->journal, interior_update_flush);
839 bch2_journal_pin_drop(&c->journal, &child->journal);
841 as->journal_seq = max(as->journal_seq, child->journal_seq);
844 static void btree_update_updated_root(struct btree_update *as)
846 struct bch_fs *c = as->c;
847 struct btree_root *r = &c->btree_roots[as->btree_id];
849 mutex_lock(&c->btree_interior_update_lock);
851 BUG_ON(as->mode != BTREE_INTERIOR_NO_UPDATE);
854 * Old root might not be persistent yet - if so, redirect its
855 * btree_update operation to point to us:
858 btree_update_reparent(as, r->as);
860 as->mode = BTREE_INTERIOR_UPDATING_ROOT;
864 mutex_unlock(&c->btree_interior_update_lock);
867 * When we're rewriting nodes and updating interior nodes, there's an
868 * issue with updates that haven't been written in the journal getting
869 * mixed together with older data - see btree_update_updated_node()
870 * for the explanation.
872 * However, this doesn't affect us when we're writing a new btree root -
873 * because to make that new root reachable we have to write out a new
874 * journal entry, which must necessarily be newer than as->journal_seq.
878 static void btree_node_will_make_reachable(struct btree_update *as,
881 struct bch_fs *c = as->c;
883 mutex_lock(&c->btree_interior_update_lock);
884 BUG_ON(as->nr_new_nodes >= ARRAY_SIZE(as->new_nodes));
885 BUG_ON(b->will_make_reachable);
887 as->new_nodes[as->nr_new_nodes++] = b;
888 b->will_make_reachable = 1UL|(unsigned long) as;
890 closure_get(&as->cl);
891 mutex_unlock(&c->btree_interior_update_lock);
894 static void btree_update_drop_new_node(struct bch_fs *c, struct btree *b)
896 struct btree_update *as;
900 mutex_lock(&c->btree_interior_update_lock);
901 v = xchg(&b->will_make_reachable, 0);
902 as = (struct btree_update *) (v & ~1UL);
905 mutex_unlock(&c->btree_interior_update_lock);
909 for (i = 0; i < as->nr_new_nodes; i++)
910 if (as->new_nodes[i] == b)
915 array_remove_item(as->new_nodes, as->nr_new_nodes, i);
916 mutex_unlock(&c->btree_interior_update_lock);
919 closure_put(&as->cl);
922 static void btree_interior_update_add_node_reference(struct btree_update *as,
925 struct bch_fs *c = as->c;
926 struct pending_btree_node_free *d;
928 mutex_lock(&c->btree_interior_update_lock);
930 /* Add this node to the list of nodes being freed: */
931 BUG_ON(as->nr_pending >= ARRAY_SIZE(as->pending));
933 d = &as->pending[as->nr_pending++];
934 d->index_update_done = false;
935 d->seq = b->data->keys.seq;
936 d->btree_id = b->btree_id;
938 bkey_copy(&d->key, &b->key);
940 mutex_unlock(&c->btree_interior_update_lock);
944 * @b is being split/rewritten: it may have pointers to not-yet-written btree
945 * nodes and thus outstanding btree_updates - redirect @b's
946 * btree_updates to point to this btree_update:
948 void bch2_btree_interior_update_will_free_node(struct btree_update *as,
951 struct bch_fs *c = as->c;
952 struct closure *cl, *cl_n;
953 struct btree_update *p, *n;
954 struct btree_write *w;
957 set_btree_node_dying(b);
959 if (btree_node_fake(b))
962 btree_interior_update_add_node_reference(as, b);
965 * Does this node have data that hasn't been written in the journal?
967 * If so, we have to wait for the corresponding journal entry to be
968 * written before making the new nodes reachable - we can't just carry
969 * over the bset->journal_seq tracking, since we'll be mixing those keys
970 * in with keys that aren't in the journal anymore:
973 as->journal_seq = max(as->journal_seq,
974 le64_to_cpu(bset(b, t)->journal_seq));
976 mutex_lock(&c->btree_interior_update_lock);
979 * Does this node have any btree_update operations preventing
980 * it from being written?
982 * If so, redirect them to point to this btree_update: we can
983 * write out our new nodes, but we won't make them visible until those
984 * operations complete
986 list_for_each_entry_safe(p, n, &b->write_blocked, write_blocked_list) {
987 list_del(&p->write_blocked_list);
988 btree_update_reparent(as, p);
991 clear_btree_node_dirty(b);
992 clear_btree_node_need_write(b);
993 w = btree_current_write(b);
996 * Does this node have any btree_update operations waiting on this node
999 * If so, wake them up when this btree_update operation is reachable:
1001 llist_for_each_entry_safe(cl, cl_n, llist_del_all(&w->wait.list), list)
1002 llist_add(&cl->list, &as->wait.list);
1005 * Does this node have unwritten data that has a pin on the journal?
1007 * If so, transfer that pin to the btree_update operation -
1008 * note that if we're freeing multiple nodes, we only need to keep the
1009 * oldest pin of any of the nodes we're freeing. We'll release the pin
1010 * when the new nodes are persistent and reachable on disk:
1012 bch2_journal_pin_add_if_older(&c->journal, &w->journal,
1013 &as->journal, interior_update_flush);
1014 bch2_journal_pin_drop(&c->journal, &w->journal);
1016 w = btree_prev_write(b);
1017 bch2_journal_pin_add_if_older(&c->journal, &w->journal,
1018 &as->journal, interior_update_flush);
1019 bch2_journal_pin_drop(&c->journal, &w->journal);
1021 mutex_unlock(&c->btree_interior_update_lock);
1024 void bch2_btree_update_done(struct btree_update *as)
1026 BUG_ON(as->mode == BTREE_INTERIOR_NO_UPDATE);
1028 bch2_btree_reserve_put(as->c, as->reserve);
1031 continue_at(&as->cl, btree_update_nodes_written, system_freezable_wq);
1034 struct btree_update *
1035 bch2_btree_update_start(struct bch_fs *c, enum btree_id id,
1036 unsigned nr_nodes, unsigned flags,
1039 struct btree_reserve *reserve;
1040 struct btree_update *as;
1042 if (unlikely(!percpu_ref_tryget(&c->writes)))
1043 return ERR_PTR(-EROFS);
1045 reserve = bch2_btree_reserve_get(c, nr_nodes, flags, cl);
1046 if (IS_ERR(reserve)) {
1047 percpu_ref_put(&c->writes);
1048 return ERR_CAST(reserve);
1051 as = mempool_alloc(&c->btree_interior_update_pool, GFP_NOIO);
1052 memset(as, 0, sizeof(*as));
1053 closure_init(&as->cl, NULL);
1055 as->mode = BTREE_INTERIOR_NO_UPDATE;
1057 as->reserve = reserve;
1058 INIT_LIST_HEAD(&as->write_blocked_list);
1060 bch2_keylist_init(&as->parent_keys, as->inline_keys);
1062 mutex_lock(&c->btree_interior_update_lock);
1063 list_add_tail(&as->list, &c->btree_interior_update_list);
1064 mutex_unlock(&c->btree_interior_update_lock);
1069 /* Btree root updates: */
1071 static void __bch2_btree_set_root_inmem(struct bch_fs *c, struct btree *b)
1073 /* Root nodes cannot be reaped */
1074 mutex_lock(&c->btree_cache.lock);
1075 list_del_init(&b->list);
1076 mutex_unlock(&c->btree_cache.lock);
1078 mutex_lock(&c->btree_root_lock);
1079 BUG_ON(btree_node_root(c, b) &&
1080 (b->level < btree_node_root(c, b)->level ||
1081 !btree_node_dying(btree_node_root(c, b))));
1083 btree_node_root(c, b) = b;
1084 mutex_unlock(&c->btree_root_lock);
1086 bch2_recalc_btree_reserve(c);
1089 static void bch2_btree_set_root_inmem(struct btree_update *as, struct btree *b)
1091 struct bch_fs *c = as->c;
1092 struct btree *old = btree_node_root(c, b);
1093 struct bch_fs_usage stats = { 0 };
1095 __bch2_btree_set_root_inmem(c, b);
1097 bch2_mark_key(c, bkey_i_to_s_c(&b->key),
1098 c->opts.btree_node_size, true,
1099 gc_pos_btree_root(b->btree_id),
1102 if (old && !btree_node_fake(old))
1103 bch2_btree_node_free_index(as, NULL,
1104 bkey_i_to_s_c(&old->key),
1106 bch2_fs_usage_apply(c, &stats, &as->reserve->disk_res,
1107 gc_pos_btree_root(b->btree_id));
1110 static void bch2_btree_set_root_ondisk(struct bch_fs *c, struct btree *b, int rw)
1112 struct btree_root *r = &c->btree_roots[b->btree_id];
1114 mutex_lock(&c->btree_root_lock);
1117 bkey_copy(&r->key, &b->key);
1118 r->level = b->level;
1121 c->btree_roots_dirty = true;
1123 mutex_unlock(&c->btree_root_lock);
1127 * bch_btree_set_root - update the root in memory and on disk
1129 * To ensure forward progress, the current task must not be holding any
1130 * btree node write locks. However, you must hold an intent lock on the
1133 * Note: This allocates a journal entry but doesn't add any keys to
1134 * it. All the btree roots are part of every journal write, so there
1135 * is nothing new to be done. This just guarantees that there is a
1138 static void bch2_btree_set_root(struct btree_update *as, struct btree *b,
1139 struct btree_iter *iter)
1141 struct bch_fs *c = as->c;
1144 trace_btree_set_root(c, b);
1145 BUG_ON(!b->written);
1147 old = btree_node_root(c, b);
1150 * Ensure no one is using the old root while we switch to the
1153 bch2_btree_node_lock_write(old, iter);
1155 bch2_btree_set_root_inmem(as, b);
1157 btree_update_updated_root(as);
1160 * Unlock old root after new root is visible:
1162 * The new root isn't persistent, but that's ok: we still have
1163 * an intent lock on the new root, and any updates that would
1164 * depend on the new root would have to update the new root.
1166 bch2_btree_node_unlock_write(old, iter);
1169 /* Interior node updates: */
1171 static void bch2_insert_fixup_btree_ptr(struct btree_update *as, struct btree *b,
1172 struct btree_iter *iter,
1173 struct bkey_i *insert,
1174 struct btree_node_iter *node_iter)
1176 struct bch_fs *c = as->c;
1177 struct bch_fs_usage stats = { 0 };
1178 struct bkey_packed *k;
1181 BUG_ON(insert->k.u64s > bch_btree_keys_u64s_remaining(c, b));
1183 if (bkey_extent_is_data(&insert->k))
1184 bch2_mark_key(c, bkey_i_to_s_c(insert),
1185 c->opts.btree_node_size, true,
1186 gc_pos_btree_node(b), &stats, 0, 0);
1188 while ((k = bch2_btree_node_iter_peek_all(node_iter, b)) &&
1189 !btree_iter_pos_cmp_packed(b, &insert->k.p, k, false))
1190 bch2_btree_node_iter_advance(node_iter, b);
1193 * If we're overwriting, look up pending delete and mark so that gc
1194 * marks it on the pending delete list:
1196 if (k && !bkey_cmp_packed(b, k, &insert->k))
1197 bch2_btree_node_free_index(as, b,
1198 bkey_disassemble(b, k, &tmp),
1201 bch2_fs_usage_apply(c, &stats, &as->reserve->disk_res,
1202 gc_pos_btree_node(b));
1204 bch2_btree_bset_insert_key(iter, b, node_iter, insert);
1205 set_btree_node_dirty(b);
1206 set_btree_node_need_write(b);
1210 * Move keys from n1 (original replacement node, now lower node) to n2 (higher
1213 static struct btree *__btree_split_node(struct btree_update *as,
1215 struct btree_iter *iter)
1217 size_t nr_packed = 0, nr_unpacked = 0;
1219 struct bset *set1, *set2;
1220 struct bkey_packed *k, *prev = NULL;
1222 n2 = bch2_btree_node_alloc(as, n1->level);
1224 n2->data->max_key = n1->data->max_key;
1225 n2->data->format = n1->format;
1226 SET_BTREE_NODE_SEQ(n2->data, BTREE_NODE_SEQ(n1->data));
1227 n2->key.k.p = n1->key.k.p;
1229 btree_node_set_format(n2, n2->data->format);
1231 set1 = btree_bset_first(n1);
1232 set2 = btree_bset_first(n2);
1235 * Has to be a linear search because we don't have an auxiliary
1240 if (bkey_next(k) == vstruct_last(set1))
1242 if (k->_data - set1->_data >= (le16_to_cpu(set1->u64s) * 3) / 5)
1256 n1->key.k.p = bkey_unpack_pos(n1, prev);
1257 n1->data->max_key = n1->key.k.p;
1259 btree_type_successor(n1->btree_id, n1->key.k.p);
1261 set2->u64s = cpu_to_le16((u64 *) vstruct_end(set1) - (u64 *) k);
1262 set1->u64s = cpu_to_le16(le16_to_cpu(set1->u64s) - le16_to_cpu(set2->u64s));
1264 set_btree_bset_end(n1, n1->set);
1265 set_btree_bset_end(n2, n2->set);
1267 n2->nr.live_u64s = le16_to_cpu(set2->u64s);
1268 n2->nr.bset_u64s[0] = le16_to_cpu(set2->u64s);
1269 n2->nr.packed_keys = n1->nr.packed_keys - nr_packed;
1270 n2->nr.unpacked_keys = n1->nr.unpacked_keys - nr_unpacked;
1272 n1->nr.live_u64s = le16_to_cpu(set1->u64s);
1273 n1->nr.bset_u64s[0] = le16_to_cpu(set1->u64s);
1274 n1->nr.packed_keys = nr_packed;
1275 n1->nr.unpacked_keys = nr_unpacked;
1277 BUG_ON(!set1->u64s);
1278 BUG_ON(!set2->u64s);
1280 memcpy_u64s(set2->start,
1282 le16_to_cpu(set2->u64s));
1284 btree_node_reset_sib_u64s(n1);
1285 btree_node_reset_sib_u64s(n2);
1287 bch2_verify_btree_nr_keys(n1);
1288 bch2_verify_btree_nr_keys(n2);
1291 btree_node_interior_verify(n1);
1292 btree_node_interior_verify(n2);
1299 * For updates to interior nodes, we've got to do the insert before we split
1300 * because the stuff we're inserting has to be inserted atomically. Post split,
1301 * the keys might have to go in different nodes and the split would no longer be
1304 * Worse, if the insert is from btree node coalescing, if we do the insert after
1305 * we do the split (and pick the pivot) - the pivot we pick might be between
1306 * nodes that were coalesced, and thus in the middle of a child node post
1309 static void btree_split_insert_keys(struct btree_update *as, struct btree *b,
1310 struct btree_iter *iter,
1311 struct keylist *keys)
1313 struct btree_node_iter node_iter;
1314 struct bkey_i *k = bch2_keylist_front(keys);
1315 struct bkey_packed *p;
1318 BUG_ON(btree_node_type(b) != BKEY_TYPE_BTREE);
1320 bch2_btree_node_iter_init(&node_iter, b, k->k.p, false, false);
1322 while (!bch2_keylist_empty(keys)) {
1323 k = bch2_keylist_front(keys);
1325 BUG_ON(bch_keylist_u64s(keys) >
1326 bch_btree_keys_u64s_remaining(as->c, b));
1327 BUG_ON(bkey_cmp(k->k.p, b->data->min_key) < 0);
1328 BUG_ON(bkey_cmp(k->k.p, b->data->max_key) > 0);
1330 bch2_insert_fixup_btree_ptr(as, b, iter, k, &node_iter);
1331 bch2_keylist_pop_front(keys);
1335 * We can't tolerate whiteouts here - with whiteouts there can be
1336 * duplicate keys, and it would be rather bad if we picked a duplicate
1339 i = btree_bset_first(b);
1341 while (p != vstruct_last(i))
1342 if (bkey_deleted(p)) {
1343 le16_add_cpu(&i->u64s, -p->u64s);
1344 set_btree_bset_end(b, b->set);
1345 memmove_u64s_down(p, bkey_next(p),
1346 (u64 *) vstruct_last(i) -
1351 BUG_ON(b->nsets != 1 ||
1352 b->nr.live_u64s != le16_to_cpu(btree_bset_first(b)->u64s));
1354 btree_node_interior_verify(b);
1357 static void btree_split(struct btree_update *as, struct btree *b,
1358 struct btree_iter *iter, struct keylist *keys,
1361 struct bch_fs *c = as->c;
1362 struct btree *parent = btree_node_parent(iter, b);
1363 struct btree *n1, *n2 = NULL, *n3 = NULL;
1364 u64 start_time = local_clock();
1366 BUG_ON(!parent && (b != btree_node_root(c, b)));
1367 BUG_ON(!btree_node_intent_locked(iter, btree_node_root(c, b)->level));
1369 bch2_btree_interior_update_will_free_node(as, b);
1371 n1 = bch2_btree_node_alloc_replacement(as, b);
1374 btree_split_insert_keys(as, n1, iter, keys);
1376 if (vstruct_blocks(n1->data, c->block_bits) > BTREE_SPLIT_THRESHOLD(c)) {
1377 trace_btree_split(c, b);
1379 n2 = __btree_split_node(as, n1, iter);
1381 bch2_btree_build_aux_trees(n2);
1382 bch2_btree_build_aux_trees(n1);
1383 six_unlock_write(&n2->lock);
1384 six_unlock_write(&n1->lock);
1386 bch2_btree_node_write(c, n2, SIX_LOCK_intent);
1389 * Note that on recursive parent_keys == keys, so we
1390 * can't start adding new keys to parent_keys before emptying it
1391 * out (which we did with btree_split_insert_keys() above)
1393 bch2_keylist_add(&as->parent_keys, &n1->key);
1394 bch2_keylist_add(&as->parent_keys, &n2->key);
1397 /* Depth increases, make a new root */
1398 n3 = __btree_root_alloc(as, b->level + 1);
1400 n3->sib_u64s[0] = U16_MAX;
1401 n3->sib_u64s[1] = U16_MAX;
1403 btree_split_insert_keys(as, n3, iter, &as->parent_keys);
1405 bch2_btree_node_write(c, n3, SIX_LOCK_intent);
1408 trace_btree_compact(c, b);
1410 bch2_btree_build_aux_trees(n1);
1411 six_unlock_write(&n1->lock);
1413 bch2_keylist_add(&as->parent_keys, &n1->key);
1416 bch2_btree_node_write(c, n1, SIX_LOCK_intent);
1418 /* New nodes all written, now make them visible: */
1421 /* Split a non root node */
1422 bch2_btree_insert_node(as, parent, iter, &as->parent_keys, flags);
1424 bch2_btree_set_root(as, n3, iter);
1426 /* Root filled up but didn't need to be split */
1427 bch2_btree_set_root(as, n1, iter);
1430 bch2_btree_open_bucket_put(c, n1);
1432 bch2_btree_open_bucket_put(c, n2);
1434 bch2_btree_open_bucket_put(c, n3);
1437 * Note - at this point other linked iterators could still have @b read
1438 * locked; we're depending on the bch2_btree_iter_node_replace() calls
1439 * below removing all references to @b so we don't return with other
1440 * iterators pointing to a node they have locked that's been freed.
1442 * We have to free the node first because the bch2_iter_node_replace()
1443 * calls will drop _our_ iterator's reference - and intent lock - to @b.
1445 bch2_btree_node_free_inmem(c, b, iter);
1447 /* Successful split, update the iterator to point to the new nodes: */
1450 bch2_btree_iter_node_replace(iter, n3);
1452 bch2_btree_iter_node_replace(iter, n2);
1453 bch2_btree_iter_node_replace(iter, n1);
1455 bch2_time_stats_update(&c->times[BCH_TIME_btree_split], start_time);
1459 bch2_btree_insert_keys_interior(struct btree_update *as, struct btree *b,
1460 struct btree_iter *iter, struct keylist *keys)
1462 struct btree_iter *linked;
1463 struct btree_node_iter node_iter;
1464 struct bkey_i *insert = bch2_keylist_front(keys);
1465 struct bkey_packed *k;
1467 /* Don't screw up @iter's position: */
1468 node_iter = iter->l[b->level].iter;
1471 * btree_split(), btree_gc_coalesce() will insert keys before
1472 * the iterator's current position - they know the keys go in
1473 * the node the iterator points to:
1475 while ((k = bch2_btree_node_iter_prev_all(&node_iter, b)) &&
1476 (bkey_cmp_packed(b, k, &insert->k) >= 0))
1479 while (!bch2_keylist_empty(keys)) {
1480 insert = bch2_keylist_front(keys);
1482 bch2_insert_fixup_btree_ptr(as, b, iter, insert, &node_iter);
1483 bch2_keylist_pop_front(keys);
1486 btree_update_updated_node(as, b);
1488 for_each_btree_iter_with_node(iter, b, linked)
1489 bch2_btree_node_iter_peek(&linked->l[b->level].iter, b);
1491 bch2_btree_iter_verify(iter, b);
1495 * bch_btree_insert_node - insert bkeys into a given btree node
1497 * @iter: btree iterator
1498 * @keys: list of keys to insert
1499 * @hook: insert callback
1500 * @persistent: if not null, @persistent will wait on journal write
1502 * Inserts as many keys as it can into a given btree node, splitting it if full.
1503 * If a split occurred, this function will return early. This can only happen
1504 * for leaf nodes -- inserts into interior nodes have to be atomic.
1506 void bch2_btree_insert_node(struct btree_update *as, struct btree *b,
1507 struct btree_iter *iter, struct keylist *keys,
1510 struct bch_fs *c = as->c;
1511 int old_u64s = le16_to_cpu(btree_bset_last(b)->u64s);
1512 int old_live_u64s = b->nr.live_u64s;
1513 int live_u64s_added, u64s_added;
1515 BUG_ON(!btree_node_intent_locked(iter, btree_node_root(c, b)->level));
1517 BUG_ON(!as || as->b);
1518 bch2_verify_keylist_sorted(keys);
1520 if (as->must_rewrite)
1523 bch2_btree_node_lock_for_insert(c, b, iter);
1525 if (!bch2_btree_node_insert_fits(c, b, bch_keylist_u64s(keys))) {
1526 bch2_btree_node_unlock_write(b, iter);
1530 bch2_btree_insert_keys_interior(as, b, iter, keys);
1532 live_u64s_added = (int) b->nr.live_u64s - old_live_u64s;
1533 u64s_added = (int) le16_to_cpu(btree_bset_last(b)->u64s) - old_u64s;
1535 if (b->sib_u64s[0] != U16_MAX && live_u64s_added < 0)
1536 b->sib_u64s[0] = max(0, (int) b->sib_u64s[0] + live_u64s_added);
1537 if (b->sib_u64s[1] != U16_MAX && live_u64s_added < 0)
1538 b->sib_u64s[1] = max(0, (int) b->sib_u64s[1] + live_u64s_added);
1540 if (u64s_added > live_u64s_added &&
1541 bch2_maybe_compact_whiteouts(c, b))
1542 bch2_btree_iter_reinit_node(iter, b);
1544 bch2_btree_node_unlock_write(b, iter);
1546 btree_node_interior_verify(b);
1548 bch2_foreground_maybe_merge(c, iter, b->level, flags);
1551 btree_split(as, b, iter, keys, flags);
1554 int bch2_btree_split_leaf(struct bch_fs *c, struct btree_iter *iter,
1557 struct btree *b = iter->l[0].b;
1558 struct btree_update *as;
1561 struct btree_iter *linked;
1564 * We already have a disk reservation and open buckets pinned; this
1565 * allocation must not block:
1567 for_each_btree_iter(iter, linked)
1568 if (linked->btree_id == BTREE_ID_EXTENTS)
1569 flags |= BTREE_INSERT_USE_RESERVE;
1571 closure_init_stack(&cl);
1573 /* Hack, because gc and splitting nodes doesn't mix yet: */
1574 if (!down_read_trylock(&c->gc_lock)) {
1575 if (flags & BTREE_INSERT_NOUNLOCK)
1578 bch2_btree_iter_unlock(iter);
1579 down_read(&c->gc_lock);
1581 if (btree_iter_linked(iter))
1586 * XXX: figure out how far we might need to split,
1587 * instead of locking/reserving all the way to the root:
1589 if (!bch2_btree_iter_upgrade(iter, U8_MAX)) {
1594 as = bch2_btree_update_start(c, iter->btree_id,
1595 btree_update_reserve_required(c, b), flags,
1596 !(flags & BTREE_INSERT_NOUNLOCK) ? &cl : NULL);
1599 if (ret == -EAGAIN) {
1600 BUG_ON(flags & BTREE_INSERT_NOUNLOCK);
1601 bch2_btree_iter_unlock(iter);
1607 btree_split(as, b, iter, NULL, flags);
1608 bch2_btree_update_done(as);
1611 * We haven't successfully inserted yet, so don't downgrade all the way
1612 * back to read locks;
1614 __bch2_btree_iter_downgrade(iter, 1);
1616 up_read(&c->gc_lock);
1621 void __bch2_foreground_maybe_merge(struct bch_fs *c,
1622 struct btree_iter *iter,
1625 enum btree_node_sibling sib)
1627 struct btree_update *as;
1628 struct bkey_format_state new_s;
1629 struct bkey_format new_f;
1630 struct bkey_i delete;
1631 struct btree *b, *m, *n, *prev, *next, *parent;
1636 closure_init_stack(&cl);
1638 BUG_ON(!btree_node_locked(iter, level));
1640 b = iter->l[level].b;
1642 parent = btree_node_parent(iter, b);
1646 if (b->sib_u64s[sib] > BTREE_FOREGROUND_MERGE_THRESHOLD(c))
1649 /* XXX: can't be holding read locks */
1650 m = bch2_btree_node_get_sibling(c, iter, b,
1651 !(flags & BTREE_INSERT_NOUNLOCK), sib);
1657 /* NULL means no sibling: */
1659 b->sib_u64s[sib] = U16_MAX;
1663 if (sib == btree_prev_sib) {
1671 bch2_bkey_format_init(&new_s);
1672 __bch2_btree_calc_format(&new_s, b);
1673 __bch2_btree_calc_format(&new_s, m);
1674 new_f = bch2_bkey_format_done(&new_s);
1676 sib_u64s = btree_node_u64s_with_format(b, &new_f) +
1677 btree_node_u64s_with_format(m, &new_f);
1679 if (sib_u64s > BTREE_FOREGROUND_MERGE_HYSTERESIS(c)) {
1680 sib_u64s -= BTREE_FOREGROUND_MERGE_HYSTERESIS(c);
1682 sib_u64s += BTREE_FOREGROUND_MERGE_HYSTERESIS(c);
1685 sib_u64s = min(sib_u64s, btree_max_u64s(c));
1686 b->sib_u64s[sib] = sib_u64s;
1688 if (b->sib_u64s[sib] > BTREE_FOREGROUND_MERGE_THRESHOLD(c)) {
1689 six_unlock_intent(&m->lock);
1693 /* We're changing btree topology, doesn't mix with gc: */
1694 if (!down_read_trylock(&c->gc_lock))
1695 goto err_cycle_gc_lock;
1697 if (!bch2_btree_iter_upgrade(iter, U8_MAX)) {
1702 as = bch2_btree_update_start(c, iter->btree_id,
1703 btree_update_reserve_required(c, parent) + 1,
1704 BTREE_INSERT_NOFAIL|
1705 BTREE_INSERT_USE_RESERVE,
1706 !(flags & BTREE_INSERT_NOUNLOCK) ? &cl : NULL);
1712 trace_btree_merge(c, b);
1714 bch2_btree_interior_update_will_free_node(as, b);
1715 bch2_btree_interior_update_will_free_node(as, m);
1717 n = bch2_btree_node_alloc(as, b->level);
1719 n->data->min_key = prev->data->min_key;
1720 n->data->max_key = next->data->max_key;
1721 n->data->format = new_f;
1722 n->key.k.p = next->key.k.p;
1724 btree_node_set_format(n, new_f);
1726 bch2_btree_sort_into(c, n, prev);
1727 bch2_btree_sort_into(c, n, next);
1729 bch2_btree_build_aux_trees(n);
1730 six_unlock_write(&n->lock);
1732 bkey_init(&delete.k);
1733 delete.k.p = prev->key.k.p;
1734 bch2_keylist_add(&as->parent_keys, &delete);
1735 bch2_keylist_add(&as->parent_keys, &n->key);
1737 bch2_btree_node_write(c, n, SIX_LOCK_intent);
1739 bch2_btree_insert_node(as, parent, iter, &as->parent_keys, flags);
1741 bch2_btree_open_bucket_put(c, n);
1742 bch2_btree_node_free_inmem(c, b, iter);
1743 bch2_btree_node_free_inmem(c, m, iter);
1744 bch2_btree_iter_node_replace(iter, n);
1746 bch2_btree_iter_verify(iter, n);
1748 bch2_btree_update_done(as);
1750 six_unlock_intent(&m->lock);
1751 up_read(&c->gc_lock);
1754 * Don't downgrade locks here: we're called after successful insert,
1755 * and the caller will downgrade locks after a successful insert
1756 * anyways (in case e.g. a split was required first)
1758 * And we're also called when inserting into interior nodes in the
1759 * split path, and downgrading to read locks in there is potentially
1766 six_unlock_intent(&m->lock);
1768 if (flags & BTREE_INSERT_NOUNLOCK)
1771 bch2_btree_iter_unlock(iter);
1773 down_read(&c->gc_lock);
1774 up_read(&c->gc_lock);
1779 six_unlock_intent(&m->lock);
1780 up_read(&c->gc_lock);
1782 BUG_ON(ret == -EAGAIN && (flags & BTREE_INSERT_NOUNLOCK));
1784 if ((ret == -EAGAIN || ret == -EINTR) &&
1785 !(flags & BTREE_INSERT_NOUNLOCK)) {
1786 bch2_btree_iter_unlock(iter);
1788 ret = bch2_btree_iter_traverse(iter);
1798 static int __btree_node_rewrite(struct bch_fs *c, struct btree_iter *iter,
1799 struct btree *b, unsigned flags,
1802 struct btree *n, *parent = btree_node_parent(iter, b);
1803 struct btree_update *as;
1805 as = bch2_btree_update_start(c, iter->btree_id,
1807 ? btree_update_reserve_required(c, parent)
1811 trace_btree_gc_rewrite_node_fail(c, b);
1815 bch2_btree_interior_update_will_free_node(as, b);
1817 n = bch2_btree_node_alloc_replacement(as, b);
1819 bch2_btree_build_aux_trees(n);
1820 six_unlock_write(&n->lock);
1822 trace_btree_gc_rewrite_node(c, b);
1824 bch2_btree_node_write(c, n, SIX_LOCK_intent);
1827 bch2_keylist_add(&as->parent_keys, &n->key);
1828 bch2_btree_insert_node(as, parent, iter, &as->parent_keys, flags);
1830 bch2_btree_set_root(as, n, iter);
1833 bch2_btree_open_bucket_put(c, n);
1835 bch2_btree_node_free_inmem(c, b, iter);
1837 bch2_btree_iter_node_replace(iter, n);
1839 bch2_btree_update_done(as);
1844 * bch_btree_node_rewrite - Rewrite/move a btree node
1846 * Returns 0 on success, -EINTR or -EAGAIN on failure (i.e.
1847 * btree_check_reserve() has to wait)
1849 int bch2_btree_node_rewrite(struct bch_fs *c, struct btree_iter *iter,
1850 __le64 seq, unsigned flags)
1856 flags |= BTREE_INSERT_NOFAIL;
1858 closure_init_stack(&cl);
1860 bch2_btree_iter_upgrade(iter, U8_MAX);
1862 if (!(flags & BTREE_INSERT_GC_LOCK_HELD)) {
1863 if (!down_read_trylock(&c->gc_lock)) {
1864 bch2_btree_iter_unlock(iter);
1865 down_read(&c->gc_lock);
1870 ret = bch2_btree_iter_traverse(iter);
1874 b = bch2_btree_iter_peek_node(iter);
1875 if (!b || b->data->keys.seq != seq)
1878 ret = __btree_node_rewrite(c, iter, b, flags, &cl);
1879 if (ret != -EAGAIN &&
1883 bch2_btree_iter_unlock(iter);
1887 bch2_btree_iter_downgrade(iter);
1889 if (!(flags & BTREE_INSERT_GC_LOCK_HELD))
1890 up_read(&c->gc_lock);
1896 static void __bch2_btree_node_update_key(struct bch_fs *c,
1897 struct btree_update *as,
1898 struct btree_iter *iter,
1899 struct btree *b, struct btree *new_hash,
1900 struct bkey_i_extent *new_key)
1902 struct btree *parent;
1906 * Two corner cases that need to be thought about here:
1908 * @b may not be reachable yet - there might be another interior update
1909 * operation waiting on @b to be written, and we're gonna deliver the
1910 * write completion to that interior update operation _before_
1911 * persisting the new_key update
1913 * That ends up working without us having to do anything special here:
1914 * the reason is, we do kick off (and do the in memory updates) for the
1915 * update for @new_key before we return, creating a new interior_update
1918 * The new interior update operation here will in effect override the
1919 * previous one. The previous one was going to terminate - make @b
1920 * reachable - in one of two ways:
1921 * - updating the btree root pointer
1923 * no, this doesn't work. argh.
1926 if (b->will_make_reachable)
1927 as->must_rewrite = true;
1929 btree_interior_update_add_node_reference(as, b);
1931 parent = btree_node_parent(iter, b);
1934 bkey_copy(&new_hash->key, &new_key->k_i);
1935 ret = bch2_btree_node_hash_insert(&c->btree_cache,
1936 new_hash, b->level, b->btree_id);
1940 bch2_keylist_add(&as->parent_keys, &new_key->k_i);
1941 bch2_btree_insert_node(as, parent, iter, &as->parent_keys, 0);
1944 mutex_lock(&c->btree_cache.lock);
1945 bch2_btree_node_hash_remove(&c->btree_cache, new_hash);
1947 bch2_btree_node_hash_remove(&c->btree_cache, b);
1949 bkey_copy(&b->key, &new_key->k_i);
1950 ret = __bch2_btree_node_hash_insert(&c->btree_cache, b);
1952 mutex_unlock(&c->btree_cache.lock);
1954 bkey_copy(&b->key, &new_key->k_i);
1957 struct bch_fs_usage stats = { 0 };
1959 BUG_ON(btree_node_root(c, b) != b);
1961 bch2_btree_node_lock_write(b, iter);
1963 bch2_mark_key(c, bkey_i_to_s_c(&new_key->k_i),
1964 c->opts.btree_node_size, true,
1965 gc_pos_btree_root(b->btree_id),
1967 bch2_btree_node_free_index(as, NULL,
1968 bkey_i_to_s_c(&b->key),
1970 bch2_fs_usage_apply(c, &stats, &as->reserve->disk_res,
1971 gc_pos_btree_root(b->btree_id));
1973 if (PTR_HASH(&new_key->k_i) != PTR_HASH(&b->key)) {
1974 mutex_lock(&c->btree_cache.lock);
1975 bch2_btree_node_hash_remove(&c->btree_cache, b);
1977 bkey_copy(&b->key, &new_key->k_i);
1978 ret = __bch2_btree_node_hash_insert(&c->btree_cache, b);
1980 mutex_unlock(&c->btree_cache.lock);
1982 bkey_copy(&b->key, &new_key->k_i);
1985 btree_update_updated_root(as);
1986 bch2_btree_node_unlock_write(b, iter);
1989 bch2_btree_update_done(as);
1992 int bch2_btree_node_update_key(struct bch_fs *c, struct btree_iter *iter,
1993 struct btree *b, struct bkey_i_extent *new_key)
1995 struct btree *parent = btree_node_parent(iter, b);
1996 struct btree_update *as = NULL;
1997 struct btree *new_hash = NULL;
2001 closure_init_stack(&cl);
2003 if (!bch2_btree_iter_upgrade(iter, U8_MAX))
2006 if (!down_read_trylock(&c->gc_lock)) {
2007 bch2_btree_iter_unlock(iter);
2008 down_read(&c->gc_lock);
2010 if (!bch2_btree_iter_relock(iter)) {
2016 /* check PTR_HASH() after @b is locked by btree_iter_traverse(): */
2017 if (PTR_HASH(&new_key->k_i) != PTR_HASH(&b->key)) {
2018 /* bch2_btree_reserve_get will unlock */
2019 ret = bch2_btree_cache_cannibalize_lock(c, &cl);
2023 bch2_btree_iter_unlock(iter);
2024 up_read(&c->gc_lock);
2026 down_read(&c->gc_lock);
2028 if (!bch2_btree_iter_relock(iter))
2032 new_hash = bch2_btree_node_mem_alloc(c);
2035 as = bch2_btree_update_start(c, iter->btree_id,
2036 parent ? btree_update_reserve_required(c, parent) : 0,
2037 BTREE_INSERT_NOFAIL|
2038 BTREE_INSERT_USE_RESERVE|
2039 BTREE_INSERT_USE_ALLOC_RESERVE,
2050 bch2_btree_iter_unlock(iter);
2051 up_read(&c->gc_lock);
2053 down_read(&c->gc_lock);
2055 if (!bch2_btree_iter_relock(iter))
2059 ret = bch2_mark_bkey_replicas(c, BCH_DATA_BTREE,
2060 extent_i_to_s_c(new_key).s_c);
2062 goto err_free_update;
2064 __bch2_btree_node_update_key(c, as, iter, b, new_hash, new_key);
2066 bch2_btree_iter_downgrade(iter);
2069 mutex_lock(&c->btree_cache.lock);
2070 list_move(&new_hash->list, &c->btree_cache.freeable);
2071 mutex_unlock(&c->btree_cache.lock);
2073 six_unlock_write(&new_hash->lock);
2074 six_unlock_intent(&new_hash->lock);
2076 up_read(&c->gc_lock);
2080 bch2_btree_update_free(as);
2087 * Only for filesystem bringup, when first reading the btree roots or allocating
2088 * btree roots when initializing a new filesystem:
2090 void bch2_btree_set_root_for_read(struct bch_fs *c, struct btree *b)
2092 BUG_ON(btree_node_root(c, b));
2094 __bch2_btree_set_root_inmem(c, b);
2095 bch2_btree_set_root_ondisk(c, b, READ);
2098 void bch2_btree_root_alloc(struct bch_fs *c, enum btree_id id)
2104 closure_init_stack(&cl);
2107 ret = bch2_btree_cache_cannibalize_lock(c, &cl);
2111 b = bch2_btree_node_mem_alloc(c);
2112 bch2_btree_cache_cannibalize_unlock(c);
2114 set_btree_node_fake(b);
2118 bkey_extent_init(&b->key);
2119 b->key.k.p = POS_MAX;
2120 bkey_i_to_extent(&b->key)->v._data[0] = U64_MAX - id;
2122 bch2_bset_init_first(b, &b->data->keys);
2123 bch2_btree_build_aux_trees(b);
2125 b->data->min_key = POS_MIN;
2126 b->data->max_key = POS_MAX;
2127 b->data->format = bch2_btree_calc_format(b);
2128 btree_node_set_format(b, b->data->format);
2130 ret = bch2_btree_node_hash_insert(&c->btree_cache, b, b->level, b->btree_id);
2133 __bch2_btree_set_root_inmem(c, b);
2135 six_unlock_write(&b->lock);
2136 six_unlock_intent(&b->lock);
2139 ssize_t bch2_btree_updates_print(struct bch_fs *c, char *buf)
2141 char *out = buf, *end = buf + PAGE_SIZE;
2142 struct btree_update *as;
2144 mutex_lock(&c->btree_interior_update_lock);
2145 list_for_each_entry(as, &c->btree_interior_update_list, list)
2146 out += scnprintf(out, end - out, "%p m %u w %u r %u j %llu\n",
2150 atomic_read(&as->cl.remaining) & CLOSURE_REMAINING_MASK,
2151 bch2_journal_pin_seq(&c->journal, &as->journal));
2152 mutex_unlock(&c->btree_interior_update_lock);
2157 size_t bch2_btree_interior_updates_nr_pending(struct bch_fs *c)
2160 struct list_head *i;
2162 mutex_lock(&c->btree_interior_update_lock);
2163 list_for_each(i, &c->btree_interior_update_list)
2165 mutex_unlock(&c->btree_interior_update_lock);