bcachefs: Add BCH_SUBVOLUME_UNLINKED
Snapshot deletion needs to become a multi step process, where we unlink,
then tear down the page cache, then delete the subvolume - the deleting
flag is equivalent to an inode with i_nlink = 0.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
diff --git a/fs/bcachefs/bcachefs.h b/fs/bcachefs/bcachefs.h
index 1608faa..56727001 100644
--- a/fs/bcachefs/bcachefs.h
+++ b/fs/bcachefs/bcachefs.h
@@ -353,6 +353,7 @@ enum bch_time_stats {
#include "quota_types.h"
#include "rebalance_types.h"
#include "replicas_types.h"
+#include "subvolume_types.h"
#include "super_types.h"
/* Number of nodes btree coalesce will try to coalesce at once */
@@ -657,6 +658,9 @@ struct bch_fs {
struct bch_snapshot_table __rcu *snapshot_table;
struct mutex snapshot_table_lock;
struct work_struct snapshot_delete_work;
+ struct work_struct snapshot_wait_for_pagecache_and_delete_work;
+ struct snapshot_id_list snapshots_unlinked;
+ struct mutex snapshots_unlinked_lock;
/* BTREE CACHE */
struct bio_set btree_bio;
