bcachefs: Add persistent counters
This adds a new superblock field for persisting counters
and adds a sysfs interface in counters/ exposing these counters.
The superblock field is ignored by older versions letting us avoid
an on disk version bump.
Each sysfs file outputs a counter that tracks since filesystem
creation and a counter for the current mount session.
Signed-off-by: Daniel Hill <daniel@gluo.nz>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
diff --git a/fs/bcachefs/bcachefs.h b/fs/bcachefs/bcachefs.h
index e7300a9..5dda57a 100644
--- a/fs/bcachefs/bcachefs.h
+++ b/fs/bcachefs/bcachefs.h
@@ -584,6 +584,7 @@ struct bch_fs {
struct list_head list;
struct kobject kobj;
+ struct kobject counters_kobj;
struct kobject internal;
struct kobject opts_dir;
struct kobject time_stats;
@@ -900,12 +901,15 @@ mempool_t bio_bounce_pages;
u64 last_bucket_seq_cleanup;
- /* The rest of this all shows up in sysfs */
+ /* TODO rewrite as counters - The rest of this all shows up in sysfs */
atomic_long_t read_realloc_races;
atomic_long_t extent_migrate_done;
atomic_long_t extent_migrate_raced;
atomic_long_t bucket_alloc_fail;
+ u64 counters_on_mount[BCH_COUNTER_NR];
+ u64 __percpu *counters;
+
unsigned btree_gc_periodic:1;
unsigned copy_gc_enabled:1;
bool promote_whole_extents;
