bcachefs: Rewrite journal_seq_blacklist machinery

Now, we store blacklisted journal sequence numbers in the superblock,
not the journal: this helps to greatly simplify the code, and more
importantly it's now implemented in a way that doesn't require all btree
nodes to be visited before starting the journal - instead, we
unconditionally blacklist the next 4 journal sequence numbers after an
unclean shutdown.

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

1 files changed, 16 insertions, 0 deletions

diff --git a/fs/bcachefs/bcachefs.h b/fs/bcachefs/bcachefs.h
index d8c487e33592..8acdc7ffeca3 100644
--- a/fs/bcachefs/bcachefs.h
+++ b/fs/bcachefs/bcachefs.h
@@ -185,6 +185,7 @@
 #include <linux/closure.h>
 #include <linux/kobject.h>
 #include <linux/list.h>
+#include <linux/math64.h>
 #include <linux/mutex.h>
 #include <linux/percpu-refcount.h>
 #include <linux/percpu-rwsem.h>
@@ -486,6 +487,7 @@ enum {
 	BCH_FS_RW,
 
 	/* shutdown: */
+	BCH_FS_STOPPING,
 	BCH_FS_EMERGENCY_RO,
 	BCH_FS_WRITE_DISABLE_COMPLETE,
 
@@ -511,6 +513,15 @@ struct bch_fs_pcpu {
 	u64			sectors_available;
 };
 
+struct journal_seq_blacklist_table {
+	size_t			nr;
+	struct journal_seq_blacklist_table_entry {
+		u64		start;
+		u64		end;
+		bool		dirty;
+	}			entries[0];
+};
+
 struct bch_fs {
 	struct closure		cl;
 
@@ -646,6 +657,11 @@ struct bch_fs {
 
 	struct io_clock		io_clock[2];
 
+	/* JOURNAL SEQ BLACKLIST */
+	struct journal_seq_blacklist_table *
+				journal_seq_blacklist_table;
+	struct work_struct	journal_seq_blacklist_gc_work;
+
 	/* ALLOCATOR */
 	spinlock_t		freelist_lock;
 	struct closure_waitlist	freelist_wait;