bcachefs: Run merges at BCH_WATERMARK_btree

This fixes a deadlock where the interior update path during journal
replay ends up doing a ton of merges on the backpointers btree, and
deadlocking.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-04-13 16:13:13 -04:00
commit 9054ef2ea9