bcachefs: Persist 64 bit io clocks

Originally, bcachefs - going back to bcache - stored, for each bucket, a
16 bit counter corresponding to how long it had been since the bucket
was read from. But, this required periodically rescaling counters on
every bucket to avoid wraparound. That wasn't an issue in bcache, where
we'd perodically rewrite the per bucket metadata all at once, but in
bcachefs we're trying to avoid having to walk every single bucket.

This patch switches to persisting 64 bit io clocks, corresponding to the
64 bit bucket timestaps introduced in the previous patch with
KEY_TYPE_alloc_v2.

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

1 files changed, 0 insertions, 11 deletions

diff --git a/fs/bcachefs/bcachefs.h b/fs/bcachefs/bcachefs.h
index bd675b88b354..763cac0efa0c 100644
--- a/fs/bcachefs/bcachefs.h
+++ b/fs/bcachefs/bcachefs.h
@@ -451,9 +451,6 @@ struct bch_dev {
 
 	size_t			fifo_last_bucket;
 
-	/* last calculated minimum prio */
-	u16			max_last_bucket_io[2];
-
 	size_t			inc_gen_needs_gc;
 	size_t			inc_gen_really_needs_gc;
 
@@ -693,14 +690,6 @@ struct bch_fs {
 	struct mutex		usage_scratch_lock;
 	struct bch_fs_usage_online *usage_scratch;
 
-	/*
-	 * When we invalidate buckets, we use both the priority and the amount
-	 * of good data to determine which buckets to reuse first - to weight
-	 * those together consistently we keep track of the smallest nonzero
-	 * priority of any bucket.
-	 */
-	struct bucket_clock	bucket_clock[2];
-
 	struct io_clock		io_clock[2];
 
 	/* JOURNAL SEQ BLACKLIST */