bcachefs: Initial commit

Initially forked from drivers/md/bcache, bcachefs is a new copy-on-write
filesystem with every feature you could possibly want.

Website: https://bcachefs.org

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

1 files changed, 36 insertions, 0 deletions

diff --git a/fs/bcachefs/clock_types.h b/fs/bcachefs/clock_types.h
new file mode 100644
index 000000000000..2b5e499e12b4
--- /dev/null
+++ b/fs/bcachefs/clock_types.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BCACHEFS_CLOCK_TYPES_H
+#define _BCACHEFS_CLOCK_TYPES_H
+
+#include "util.h"
+
+#define NR_IO_TIMERS		(BCH_SB_MEMBERS_MAX * 3)
+
+/*
+ * Clocks/timers in units of sectors of IO:
+ *
+ * Note - they use percpu batching, so they're only approximate.
+ */
+
+struct io_timer;
+typedef void (*io_timer_fn)(struct io_timer *);
+
+struct io_timer {
+	io_timer_fn		fn;
+	unsigned long		expire;
+};
+
+/* Amount to buffer up on a percpu counter */
+#define IO_CLOCK_PCPU_SECTORS	128
+
+typedef HEAP(struct io_timer *)	io_timer_heap;
+
+struct io_clock {
+	atomic_long_t		now;
+	u16 __percpu		*pcpu_buf;
+
+	spinlock_t		timer_lock;
+	io_timer_heap		timers;
+};
+
+#endif /* _BCACHEFS_CLOCK_TYPES_H */