1 files changed, 628 insertions, 0 deletions

diff --git a/fs/bcachefs/btree_update_leaf.c b/fs/bcachefs/btree_update_leaf.c
new file mode 100644
index 000000000000..cc41140fbe3a
--- /dev/null
+++ b/fs/bcachefs/btree_update_leaf.c
@@ -0,0 +1,628 @@
+
+#include "bcachefs.h"
+#include "btree_update.h"
+#include "btree_update_interior.h"
+#include "btree_io.h"
+#include "btree_iter.h"
+#include "btree_locking.h"
+#include "debug.h"
+#include "extents.h"
+#include "journal.h"
+#include "journal_reclaim.h"
+#include "keylist.h"
+
+#include <linux/sort.h>
+#include <trace/events/bcachefs.h>
+
+/* Inserting into a given leaf node (last stage of insert): */
+
+/* Handle overwrites and do insert, for non extents: */
+bool bch2_btree_bset_insert_key(struct btree_iter *iter,
+				struct btree *b,
+				struct btree_node_iter *node_iter,
+				struct bkey_i *insert)
+{
+	const struct bkey_format *f = &b->format;
+	struct bkey_packed *k;
+	struct bset_tree *t;
+	unsigned clobber_u64s;
+
+	EBUG_ON(btree_node_just_written(b));
+	EBUG_ON(bset_written(b, btree_bset_last(b)));
+	EBUG_ON(bkey_deleted(&insert->k) && bkey_val_u64s(&insert->k));
+	EBUG_ON(bkey_cmp(bkey_start_pos(&insert->k), b->data->min_key) < 0 ||
+		bkey_cmp(insert->k.p, b->data->max_key) > 0);
+
+	k = bch2_btree_node_iter_peek_all(node_iter, b);
+	if (k && !bkey_cmp_packed(b, k, &insert->k)) {
+		BUG_ON(bkey_whiteout(k));
+
+		t = bch2_bkey_to_bset(b, k);
+
+		if (bset_unwritten(b, bset(b, t)) &&
+		    bkey_val_u64s(&insert->k) == bkeyp_val_u64s(f, k) &&
+		    !bkey_whiteout(&insert->k)) {
+			k->type = insert->k.type;
+			memcpy_u64s(bkeyp_val(f, k), &insert->v,
+				    bkey_val_u64s(&insert->k));
+			return true;
+		}
+
+		insert->k.needs_whiteout = k->needs_whiteout;
+
+		btree_keys_account_key_drop(&b->nr, t - b->set, k);
+
+		if (t == bset_tree_last(b)) {
+			clobber_u64s = k->u64s;
+
+			/*
+			 * If we're deleting, and the key we're deleting doesn't
+			 * need a whiteout (it wasn't overwriting a key that had
+			 * been written to disk) - just delete it:
+			 */
+			if (bkey_whiteout(&insert->k) && !k->needs_whiteout) {
+				bch2_bset_delete(b, k, clobber_u64s);
+				bch2_btree_node_iter_fix(iter, b, node_iter, t,
+							k, clobber_u64s, 0);
+				return true;
+			}
+
+			goto overwrite;
+		}
+
+		k->type = KEY_TYPE_DELETED;
+		bch2_btree_node_iter_fix(iter, b, node_iter, t, k,
+					k->u64s, k->u64s);
+
+		if (bkey_whiteout(&insert->k)) {
+			reserve_whiteout(b, t, k);
+			return true;
+		} else {
+			k->needs_whiteout = false;
+		}
+	} else {
+		/*
+		 * Deleting, but the key to delete wasn't found - nothing to do:
+		 */
+		if (bkey_whiteout(&insert->k))
+			return false;
+
+		insert->k.needs_whiteout = false;
+	}
+
+	t = bset_tree_last(b);
+	k = bch2_btree_node_iter_bset_pos(node_iter, b, t);
+	clobber_u64s = 0;
+overwrite:
+	bch2_bset_insert(b, node_iter, k, insert, clobber_u64s);
+	if (k->u64s != clobber_u64s || bkey_whiteout(&insert->k))
+		bch2_btree_node_iter_fix(iter, b, node_iter, t, k,
+					clobber_u64s, k->u64s);
+	return true;
+}
+
+static void __btree_node_flush(struct journal *j, struct journal_entry_pin *pin,
+			       unsigned i, u64 seq)
+{
+	struct bch_fs *c = container_of(j, struct bch_fs, journal);
+	struct btree_write *w = container_of(pin, struct btree_write, journal);
+	struct btree *b = container_of(w, struct btree, writes[i]);
+
+	btree_node_lock_type(c, b, SIX_LOCK_read);
+	bch2_btree_node_write_cond(c, b,
+			(btree_current_write(b) == w &&
+			 w->journal.pin_list == journal_seq_pin(j, seq)));
+	six_unlock_read(&b->lock);
+}
+
+static void btree_node_flush0(struct journal *j, struct journal_entry_pin *pin, u64 seq)
+{
+	return __btree_node_flush(j, pin, 0, seq);
+}
+
+static void btree_node_flush1(struct journal *j, struct journal_entry_pin *pin, u64 seq)
+{
+	return __btree_node_flush(j, pin, 1, seq);
+}
+
+void bch2_btree_journal_key(struct btree_insert *trans,
+			   struct btree_iter *iter,
+			   struct bkey_i *insert)
+{
+	struct bch_fs *c = trans->c;
+	struct journal *j = &c->journal;
+	struct btree *b = iter->l[0].b;
+	struct btree_write *w = btree_current_write(b);
+
+	EBUG_ON(iter->level || b->level);
+	EBUG_ON(trans->journal_res.ref !=
+		!(trans->flags & BTREE_INSERT_JOURNAL_REPLAY));
+
+	if (likely(!(trans->flags & BTREE_INSERT_JOURNAL_REPLAY))) {
+		u64 seq = trans->journal_res.seq;
+		bool needs_whiteout = insert->k.needs_whiteout;
+
+		/* ick */
+		insert->k.needs_whiteout = false;
+		bch2_journal_add_keys(j, &trans->journal_res,
+				      iter->btree_id, insert);
+		insert->k.needs_whiteout = needs_whiteout;
+
+		bch2_journal_set_has_inode(j, &trans->journal_res,
+					   insert->k.p.inode);
+
+		if (trans->journal_seq)
+			*trans->journal_seq = seq;
+		btree_bset_last(b)->journal_seq = cpu_to_le64(seq);
+	}
+
+	if (unlikely(!journal_pin_active(&w->journal))) {
+		u64 seq = likely(!(trans->flags & BTREE_INSERT_JOURNAL_REPLAY))
+			? trans->journal_res.seq
+			: j->replay_journal_seq;
+
+		bch2_journal_pin_add(j, seq, &w->journal,
+				     btree_node_write_idx(b) == 0
+				     ? btree_node_flush0
+				     : btree_node_flush1);
+	}
+
+	if (unlikely(!btree_node_dirty(b)))
+		set_btree_node_dirty(b);
+}
+
+static enum btree_insert_ret
+bch2_insert_fixup_key(struct btree_insert *trans,
+		     struct btree_insert_entry *insert)
+{
+	struct btree_iter *iter = insert->iter;
+	struct btree_iter_level *l = &iter->l[0];
+
+	EBUG_ON(iter->level);
+	EBUG_ON(insert->k->k.u64s >
+		bch_btree_keys_u64s_remaining(trans->c, l->b));
+
+	if (bch2_btree_bset_insert_key(iter, l->b, &l->iter,
+				       insert->k))
+		bch2_btree_journal_key(trans, iter, insert->k);
+
+	trans->did_work = true;
+	return BTREE_INSERT_OK;
+}
+
+/**
+ * btree_insert_key - insert a key one key into a leaf node
+ */
+static enum btree_insert_ret
+btree_insert_key_leaf(struct btree_insert *trans,
+		      struct btree_insert_entry *insert)
+{
+	struct bch_fs *c = trans->c;
+	struct btree_iter *iter = insert->iter;
+	struct btree *b = iter->l[0].b;
+	enum btree_insert_ret ret;
+	int old_u64s = le16_to_cpu(btree_bset_last(b)->u64s);
+	int old_live_u64s = b->nr.live_u64s;
+	int live_u64s_added, u64s_added;
+
+	btree_iter_set_dirty(iter, BTREE_ITER_NEED_PEEK);
+
+	ret = !btree_node_is_extents(b)
+		? bch2_insert_fixup_key(trans, insert)
+		: bch2_insert_fixup_extent(trans, insert);
+
+	live_u64s_added = (int) b->nr.live_u64s - old_live_u64s;
+	u64s_added = (int) le16_to_cpu(btree_bset_last(b)->u64s) - old_u64s;
+
+	if (b->sib_u64s[0] != U16_MAX && live_u64s_added < 0)
+		b->sib_u64s[0] = max(0, (int) b->sib_u64s[0] + live_u64s_added);
+	if (b->sib_u64s[1] != U16_MAX && live_u64s_added < 0)
+		b->sib_u64s[1] = max(0, (int) b->sib_u64s[1] + live_u64s_added);
+
+	if (u64s_added > live_u64s_added &&
+	    bch2_maybe_compact_whiteouts(c, b))
+		bch2_btree_iter_reinit_node(iter, b);
+
+	trace_btree_insert_key(c, b, insert->k);
+	return ret;
+}
+
+static bool same_leaf_as_prev(struct btree_insert *trans,
+			      struct btree_insert_entry *i)
+{
+	/*
+	 * Because we sorted the transaction entries, if multiple iterators
+	 * point to the same leaf node they'll always be adjacent now:
+	 */
+	return i != trans->entries &&
+		i[0].iter->l[0].b == i[-1].iter->l[0].b;
+}
+
+#define trans_for_each_entry(trans, i)					\
+	for ((i) = (trans)->entries; (i) < (trans)->entries + (trans)->nr; (i)++)
+
+inline void bch2_btree_node_lock_for_insert(struct bch_fs *c, struct btree *b,
+					    struct btree_iter *iter)
+{
+	bch2_btree_node_lock_write(b, iter);
+
+	if (btree_node_just_written(b) &&
+	    bch2_btree_post_write_cleanup(c, b))
+		bch2_btree_iter_reinit_node(iter, b);
+
+	/*
+	 * If the last bset has been written, or if it's gotten too big - start
+	 * a new bset to insert into:
+	 */
+	if (want_new_bset(c, b))
+		bch2_btree_init_next(c, b, iter);
+}
+
+static void multi_lock_write(struct bch_fs *c, struct btree_insert *trans)
+{
+	struct btree_insert_entry *i;
+
+	trans_for_each_entry(trans, i)
+		if (!same_leaf_as_prev(trans, i))
+			bch2_btree_node_lock_for_insert(c, i->iter->l[0].b,
+							i->iter);
+}
+
+static void multi_unlock_write(struct btree_insert *trans)
+{
+	struct btree_insert_entry *i;
+
+	trans_for_each_entry(trans, i)
+		if (!same_leaf_as_prev(trans, i))
+			bch2_btree_node_unlock_write(i->iter->l[0].b, i->iter);
+}
+
+static inline int btree_trans_cmp(struct btree_insert_entry l,
+				  struct btree_insert_entry r)
+{
+	return btree_iter_cmp(l.iter, r.iter);
+}
+
+/* Normal update interface: */
+
+/**
+ * __bch_btree_insert_at - insert keys at given iterator positions
+ *
+ * This is main entry point for btree updates.
+ *
+ * Return values:
+ * -EINTR: locking changed, this function should be called again. Only returned
+ *  if passed BTREE_INSERT_ATOMIC.
+ * -EROFS: filesystem read only
+ * -EIO: journal or btree node IO error
+ */
+int __bch2_btree_insert_at(struct btree_insert *trans)
+{
+	struct bch_fs *c = trans->c;
+	struct btree_insert_entry *i;
+	struct btree_iter *split = NULL;
+	bool cycle_gc_lock = false;
+	unsigned u64s;
+	int ret;
+
+	trans_for_each_entry(trans, i) {
+		BUG_ON(i->iter->level);
+		BUG_ON(bkey_cmp(bkey_start_pos(&i->k->k), i->iter->pos));
+		BUG_ON(debug_check_bkeys(c) &&
+		       bch2_bkey_invalid(c, i->iter->btree_id,
+					 bkey_i_to_s_c(i->k)));
+	}
+
+	bubble_sort(trans->entries, trans->nr, btree_trans_cmp);
+
+	if (unlikely(!percpu_ref_tryget(&c->writes)))
+		return -EROFS;
+retry_locks:
+	ret = -EINTR;
+	trans_for_each_entry(trans, i) {
+		if (!bch2_btree_iter_set_locks_want(i->iter, 1))
+			goto err;
+
+		if (i->iter->uptodate == BTREE_ITER_NEED_TRAVERSE) {
+			ret = bch2_btree_iter_traverse(i->iter);
+			if (ret)
+				goto err;
+		}
+	}
+retry:
+	trans->did_work = false;
+	u64s = 0;
+	trans_for_each_entry(trans, i)
+		if (!i->done)
+			u64s += jset_u64s(i->k->k.u64s + i->extra_res);
+
+	memset(&trans->journal_res, 0, sizeof(trans->journal_res));
+
+	ret = !(trans->flags & BTREE_INSERT_JOURNAL_REPLAY)
+		? bch2_journal_res_get(&c->journal,
+				      &trans->journal_res,
+				      u64s, u64s)
+		: 0;
+	if (ret)
+		goto err;
+
+	multi_lock_write(c, trans);
+
+	if (race_fault()) {
+		ret = -EINTR;
+		goto unlock;
+	}
+
+	u64s = 0;
+	trans_for_each_entry(trans, i) {
+		/* Multiple inserts might go to same leaf: */
+		if (!same_leaf_as_prev(trans, i))
+			u64s = 0;
+
+		/*
+		 * bch2_btree_node_insert_fits() must be called under write lock:
+		 * with only an intent lock, another thread can still call
+		 * bch2_btree_node_write(), converting an unwritten bset to a
+		 * written one
+		 */
+		if (!i->done) {
+			u64s += i->k->k.u64s + i->extra_res;
+			if (!bch2_btree_node_insert_fits(c,
+					i->iter->l[0].b, u64s)) {
+				split = i->iter;
+				goto unlock;
+			}
+		}
+	}
+
+	ret = 0;
+	split = NULL;
+	cycle_gc_lock = false;
+
+	trans_for_each_entry(trans, i) {
+		if (i->done)
+			continue;
+
+		switch (btree_insert_key_leaf(trans, i)) {
+		case BTREE_INSERT_OK:
+			i->done = true;
+			break;
+		case BTREE_INSERT_JOURNAL_RES_FULL:
+		case BTREE_INSERT_NEED_TRAVERSE:
+			ret = -EINTR;
+			break;
+		case BTREE_INSERT_NEED_RESCHED:
+			ret = -EAGAIN;
+			break;
+		case BTREE_INSERT_BTREE_NODE_FULL:
+			split = i->iter;
+			break;
+		case BTREE_INSERT_ENOSPC:
+			ret = -ENOSPC;
+			break;
+		case BTREE_INSERT_NEED_GC_LOCK:
+			cycle_gc_lock = true;
+			ret = -EINTR;
+			break;
+		default:
+			BUG();
+		}
+
+		if (!trans->did_work && (ret || split))
+			break;
+	}
+unlock:
+	multi_unlock_write(trans);
+	bch2_journal_res_put(&c->journal, &trans->journal_res);
+
+	if (split)
+		goto split;
+	if (ret)
+		goto err;
+
+	trans_for_each_entry(trans, i)
+		if (i->iter->flags & BTREE_ITER_AT_END_OF_LEAF)
+			goto out;
+
+	trans_for_each_entry(trans, i) {
+		/*
+		 * iterators are inconsistent when they hit end of leaf, until
+		 * traversed again
+		 */
+		if (i->iter->uptodate < BTREE_ITER_NEED_TRAVERSE &&
+		    !same_leaf_as_prev(trans, i))
+			bch2_foreground_maybe_merge(c, i->iter, 0);
+	}
+out:
+	/* make sure we didn't lose an error: */
+	if (!ret && IS_ENABLED(CONFIG_BCACHEFS_DEBUG))
+		trans_for_each_entry(trans, i)
+			BUG_ON(!i->done);
+
+	percpu_ref_put(&c->writes);
+	return ret;
+split:
+	/*
+	 * have to drop journal res before splitting, because splitting means
+	 * allocating new btree nodes, and holding a journal reservation
+	 * potentially blocks the allocator:
+	 */
+	ret = bch2_btree_split_leaf(c, split, trans->flags);
+
+	/*
+	 * This can happen when we insert part of an extent - with an update
+	 * with multiple keys, we don't want to redo the entire update - that's
+	 * just too confusing:
+	 */
+	if (!ret &&
+	    (trans->flags & BTREE_INSERT_ATOMIC) &&
+	    trans->did_work)
+		ret = -EINTR;
+
+	if (ret)
+		goto err;
+
+	/*
+	 * if the split didn't have to drop locks the insert will still be
+	 * atomic (in the BTREE_INSERT_ATOMIC sense, what the caller peeked()
+	 * and is overwriting won't have changed)
+	 */
+	goto retry_locks;
+err:
+	if (cycle_gc_lock) {
+		down_read(&c->gc_lock);
+		up_read(&c->gc_lock);
+	}
+
+	if (ret == -EINTR) {
+		trans_for_each_entry(trans, i) {
+			int ret2 = bch2_btree_iter_traverse(i->iter);
+			if (ret2) {
+				ret = ret2;
+				goto out;
+			}
+		}
+
+		/*
+		 * BTREE_ITER_ATOMIC means we have to return -EINTR if we
+		 * dropped locks:
+		 */
+		if (!(trans->flags & BTREE_INSERT_ATOMIC))
+			goto retry;
+	}
+
+	goto out;
+}
+
+int bch2_btree_delete_at(struct btree_iter *iter, unsigned flags)
+{
+	struct bkey_i k;
+
+	bkey_init(&k.k);
+	k.k.p = iter->pos;
+
+	return bch2_btree_insert_at(iter->c, NULL, NULL, NULL,
+				    BTREE_INSERT_NOFAIL|
+				    BTREE_INSERT_USE_RESERVE|flags,
+				    BTREE_INSERT_ENTRY(iter, &k));
+}
+
+int bch2_btree_insert_list_at(struct btree_iter *iter,
+			     struct keylist *keys,
+			     struct disk_reservation *disk_res,
+			     struct extent_insert_hook *hook,
+			     u64 *journal_seq, unsigned flags)
+{
+	BUG_ON(flags & BTREE_INSERT_ATOMIC);
+	BUG_ON(bch2_keylist_empty(keys));
+	bch2_verify_keylist_sorted(keys);
+
+	while (!bch2_keylist_empty(keys)) {
+		int ret = bch2_btree_insert_at(iter->c, disk_res, hook,
+				journal_seq, flags,
+				BTREE_INSERT_ENTRY(iter, bch2_keylist_front(keys)));
+		if (ret)
+			return ret;
+
+		bch2_keylist_pop_front(keys);
+	}
+
+	return 0;
+}
+
+/**
+ * bch_btree_insert - insert keys into the extent btree
+ * @c:			pointer to struct bch_fs
+ * @id:			btree to insert into
+ * @insert_keys:	list of keys to insert
+ * @hook:		insert callback
+ */
+int bch2_btree_insert(struct bch_fs *c, enum btree_id id,
+		     struct bkey_i *k,
+		     struct disk_reservation *disk_res,
+		     struct extent_insert_hook *hook,
+		     u64 *journal_seq, int flags)
+{
+	struct btree_iter iter;
+	int ret;
+
+	bch2_btree_iter_init(&iter, c, id, bkey_start_pos(&k->k),
+			     BTREE_ITER_INTENT);
+	ret = bch2_btree_insert_at(c, disk_res, hook, journal_seq, flags,
+				  BTREE_INSERT_ENTRY(&iter, k));
+	bch2_btree_iter_unlock(&iter);
+
+	return ret;
+}
+
+/*
+ * bch_btree_delete_range - delete everything within a given range
+ *
+ * Range is a half open interval - [start, end)
+ */
+int bch2_btree_delete_range(struct bch_fs *c, enum btree_id id,
+			   struct bpos start,
+			   struct bpos end,
+			   struct bversion version,
+			   struct disk_reservation *disk_res,
+			   struct extent_insert_hook *hook,
+			   u64 *journal_seq)
+{
+	struct btree_iter iter;
+	struct bkey_s_c k;
+	int ret = 0;
+
+	bch2_btree_iter_init(&iter, c, id, start,
+			     BTREE_ITER_INTENT);
+
+	while ((k = bch2_btree_iter_peek(&iter)).k &&
+	       !(ret = btree_iter_err(k))) {
+		unsigned max_sectors = KEY_SIZE_MAX & (~0 << c->block_bits);
+		/* really shouldn't be using a bare, unpadded bkey_i */
+		struct bkey_i delete;
+
+		if (bkey_cmp(iter.pos, end) >= 0)
+			break;
+
+		bkey_init(&delete.k);
+
+		/*
+		 * For extents, iter.pos won't necessarily be the same as
+		 * bkey_start_pos(k.k) (for non extents they always will be the
+		 * same). It's important that we delete starting from iter.pos
+		 * because the range we want to delete could start in the middle
+		 * of k.
+		 *
+		 * (bch2_btree_iter_peek() does guarantee that iter.pos >=
+		 * bkey_start_pos(k.k)).
+		 */
+		delete.k.p = iter.pos;
+		delete.k.version = version;
+
+		if (iter.flags & BTREE_ITER_IS_EXTENTS) {
+			/*
+			 * The extents btree is special - KEY_TYPE_DISCARD is
+			 * used for deletions, not KEY_TYPE_DELETED. This is an
+			 * internal implementation detail that probably
+			 * shouldn't be exposed (internally, KEY_TYPE_DELETED is
+			 * used as a proxy for k->size == 0):
+			 */
+			delete.k.type = KEY_TYPE_DISCARD;
+
+			/* create the biggest key we can */
+			bch2_key_resize(&delete.k, max_sectors);
+			bch2_cut_back(end, &delete.k);
+		}
+
+		ret = bch2_btree_insert_at(c, disk_res, hook, journal_seq,
+					  BTREE_INSERT_NOFAIL,
+					  BTREE_INSERT_ENTRY(&iter, &delete));
+		if (ret)
+			break;
+
+		bch2_btree_iter_cond_resched(&iter);
+	}
+
+	bch2_btree_iter_unlock(&iter);
+	return ret;
+}