1 files changed, 76 insertions, 1 deletions

diff --git a/libbcachefs/journal.c b/libbcachefs/journal.c
index f2963a6c..fd7f9ff3 100644
--- a/libbcachefs/journal.c
+++ b/libbcachefs/journal.c
@@ -415,7 +415,7 @@ static int journal_entry_open(struct journal *j)
 	if (atomic64_read(&j->seq) - j->seq_write_started == JOURNAL_STATE_BUF_NR)
 		return -BCH_ERR_journal_max_open;
 
-	if (journal_cur_seq(j) >= JOURNAL_SEQ_MAX) {
+	if (unlikely(journal_cur_seq(j) >= JOURNAL_SEQ_MAX)) {
 		bch_err(c, "cannot start: journal seq overflow");
 		if (bch2_fs_emergency_read_only_locked(c))
 			bch_err(c, "fatal error - emergency read only");
@@ -459,6 +459,14 @@ static int journal_entry_open(struct journal *j)
 	atomic64_inc(&j->seq);
 	journal_pin_list_init(fifo_push_ref(&j->pin), 1);
 
+	if (unlikely(bch2_journal_seq_is_blacklisted(c, journal_cur_seq(j), false))) {
+		bch_err(c, "attempting to open blacklisted journal seq %llu",
+			journal_cur_seq(j));
+		if (bch2_fs_emergency_read_only_locked(c))
+			bch_err(c, "fatal error - emergency read only");
+		return -BCH_ERR_journal_shutdown;
+	}
+
 	BUG_ON(j->pin.back - 1 != atomic64_read(&j->seq));
 
 	BUG_ON(j->buf + (journal_cur_seq(j) & JOURNAL_BUF_MASK) != buf);
@@ -1296,6 +1304,66 @@ int bch2_set_nr_journal_buckets(struct bch_fs *c, struct bch_dev *ca,
 	return ret;
 }
 
+int bch2_dev_journal_bucket_delete(struct bch_dev *ca, u64 b)
+{
+	struct bch_fs *c = ca->fs;
+	struct journal *j = &c->journal;
+	struct journal_device *ja = &ca->journal;
+
+	guard(mutex)(&c->sb_lock);
+	unsigned pos;
+	for (pos = 0; pos < ja->nr; pos++)
+		if (ja->buckets[pos] == b)
+			break;
+
+	if (pos == ja->nr) {
+		bch_err(ca, "journal bucket %llu not found when deleting", b);
+		return -EINVAL;
+	}
+
+	u64 *new_buckets = kcalloc(ja->nr, sizeof(u64), GFP_KERNEL);;
+	if (!new_buckets)
+		return -BCH_ERR_ENOMEM_set_nr_journal_buckets;
+
+	memcpy(new_buckets, ja->buckets, ja->nr * sizeof(u64));
+	memmove(&new_buckets[pos],
+		&new_buckets[pos + 1],
+		(ja->nr - 1 - pos) * sizeof(new_buckets[0]));
+
+	int ret = bch2_journal_buckets_to_sb(c, ca, ja->buckets, ja->nr - 1) ?:
+		bch2_write_super(c);
+	if (ret) {
+		kfree(new_buckets);
+		return ret;
+	}
+
+	scoped_guard(spinlock, &j->lock) {
+		if (pos < ja->discard_idx)
+			--ja->discard_idx;
+		if (pos < ja->dirty_idx_ondisk)
+			--ja->dirty_idx_ondisk;
+		if (pos < ja->dirty_idx)
+			--ja->dirty_idx;
+		if (pos < ja->cur_idx)
+			--ja->cur_idx;
+
+		ja->nr--;
+
+		memmove(&ja->buckets[pos],
+			&ja->buckets[pos + 1],
+			(ja->nr - pos) * sizeof(ja->buckets[0]));
+
+		memmove(&ja->bucket_seq[pos],
+			&ja->bucket_seq[pos + 1],
+			(ja->nr - pos) * sizeof(ja->bucket_seq[0]));
+
+		bch2_journal_space_available(j);
+	}
+
+	kfree(new_buckets);
+	return 0;
+}
+
 int bch2_dev_journal_alloc(struct bch_dev *ca, bool new_fs)
 {
 	struct bch_fs *c = ca->fs;
@@ -1415,6 +1483,13 @@ int bch2_fs_journal_start(struct journal *j, u64 cur_seq)
 	bool had_entries = false;
 	u64 last_seq = cur_seq, nr, seq;
 
+	/*
+	 *
+	 * XXX pick most recent non blacklisted sequence number
+	 */
+
+	cur_seq = max(cur_seq, bch2_journal_last_blacklisted_seq(c));
+
 	if (cur_seq >= JOURNAL_SEQ_MAX) {
 		bch_err(c, "cannot start: journal seq overflow");
 		return -EINVAL;