bcachefs: Don't run bch2_delete_dead_snapshots() unnecessarily
Be a bit more careful about when bch2_delete_dead_snapshots needs to
run: it only needs to run synchronously if we're running fsck, and it
only needs to run at all if we have snapshot nodes to delete or if fsck
has noticed that it needs to run.
Also:
Rename BCH_FS_HAVE_DELETED_SNAPSHOTS -> BCH_FS_NEED_DELETE_DEAD_SNAPSHOTS
Kill bch2_delete_dead_snapshots_hook(), move functionality to
bch2_mark_snapshot()
Factor out bch2_check_snapshot_needs_deletion(), to explicitly check
if we need to be running snapshot deletion.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
7 files changed
