bcachefs: New erasure coding shutdown path

This implements a new shutdown path for erasure coding, which is needed
for the upcoming BCH_WRITE_WAIT_FOR_EC write path.

The process is:
 - Cancel new stripes being built up
 - Close out/cancel open buckets on write points or the partial list
   that are for stripes
 - Shutdown rebalance/copygc
 - Then wait for in flight new stripes to finish

With BCH_WRITE_WAIT_FOR_EC, move ops will be waiting on stripes to fill
up before they complete; the new ec shutdown path is needed for shutting
down copygc/rebalance without deadlocking.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

1 files changed, 3 insertions, 9 deletions

diff --git a/fs/bcachefs/super.c b/fs/bcachefs/super.c
index bf3aabdb0fc9..278f8f19a230 100644
--- a/fs/bcachefs/super.c
+++ b/fs/bcachefs/super.c
@@ -205,9 +205,12 @@ static void __bch2_fs_read_only(struct bch_fs *c)
 	unsigned i, clean_passes = 0;
 	u64 seq = 0;
 
+	bch2_fs_ec_stop(c);
+	bch2_open_buckets_stop(c, NULL, true);
 	bch2_rebalance_stop(c);
 	bch2_copygc_stop(c);
 	bch2_gc_thread_stop(c);
+	bch2_fs_ec_flush(c);
 
 	bch_verbose(c, "flushing journal and stopping allocators, journal seq %llu",
 		    journal_cur_seq(&c->journal));
@@ -700,15 +703,6 @@ static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts)
 	INIT_LIST_HEAD(&c->fsck_errors);
 	mutex_init(&c->fsck_error_lock);
 
-	INIT_LIST_HEAD(&c->ec_stripe_head_list);
-	mutex_init(&c->ec_stripe_head_lock);
-
-	INIT_LIST_HEAD(&c->ec_stripe_new_list);
-	mutex_init(&c->ec_stripe_new_lock);
-
-
-	mutex_init(&c->ec_stripes_heap_lock);
-
 	seqcount_init(&c->gc_pos_lock);
 
 	seqcount_init(&c->usage_lock);