Not sure we have a list for library code, but this might be of interest to anyone who's had to debug refcount issues on refs with lots of users (filesystem people), and I know the hardening folks deal with refcounts a lot. In release mode, this is just a wrapper around percpu refcounts. In debug mode, this provides separate sub-refcounts for each enumerated user, and provides facilities for printing them. Meaning, if you're debugging a refcount issue, you no longer have to go searching through the entire codebase - it'll tell you the exact codepath. bcachefs patches are provided as example usage, for other subsystems. Kent Overstreet (3): bcachefs: enumerated_ref.c bcachefs: bch_fs.writes -> enumerated_refs bcachefs: bch_dev.io_ref -> enumerated_ref fs/bcachefs/Makefile | 1 + fs/bcachefs/alloc_background.c | 41 ++++---- fs/bcachefs/backpointers.c | 6 +- fs/bcachefs/bcachefs.h | 105 ++++++++++---------- fs/bcachefs/btree_gc.c | 7 +- fs/bcachefs/btree_io.c | 29 +++--- fs/bcachefs/btree_node_scan.c | 10 +- fs/bcachefs/btree_trans_commit.c | 5 +- fs/bcachefs/btree_update_interior.c | 7 +- fs/bcachefs/btree_write_buffer.c | 11 ++- fs/bcachefs/buckets.c | 4 +- fs/bcachefs/debug.c | 12 ++- fs/bcachefs/ec.c | 32 ++++--- fs/bcachefs/enumerated_ref.c | 144 ++++++++++++++++++++++++++++ fs/bcachefs/enumerated_ref.h | 66 +++++++++++++ fs/bcachefs/enumerated_ref_types.h | 19 ++++ fs/bcachefs/fs-io-direct.c | 7 +- fs/bcachefs/fs-io.c | 15 +-- fs/bcachefs/io_read.c | 17 ++-- fs/bcachefs/io_write.c | 20 ++-- fs/bcachefs/journal.c | 10 +- fs/bcachefs/journal_io.c | 15 +-- fs/bcachefs/journal_reclaim.c | 2 +- fs/bcachefs/reflink.c | 5 +- fs/bcachefs/sb-members.h | 32 ++++--- fs/bcachefs/snapshot.c | 7 +- fs/bcachefs/subvolume.c | 7 +- fs/bcachefs/super-io.c | 18 ++-- fs/bcachefs/super.c | 125 +++++++++++------------- fs/bcachefs/super.h | 3 + fs/bcachefs/sysfs.c | 46 ++++----- 31 files changed, 540 insertions(+), 288 deletions(-) create mode 100644 fs/bcachefs/enumerated_ref.c create mode 100644 fs/bcachefs/enumerated_ref.h create mode 100644 fs/bcachefs/enumerated_ref_types.h -- 2.49.0
