Active subsystems in linux-btrfs

53 subsystems with patch activity in the last 7 days, busiest first. Each links to its own dashboard: recent patches, active threads and reviewers for the paths that subsystem claims in MAINTAINERS.

• btrfs file system
  112 messages in 7d · last 2026-11-01 07:14 · David Sterba
• overlay filesystem Supported
  14 messages in 7d · last 2026-10-27 21:10 · Miklos Szeredi et al.
• security subsystem Supported
  13 messages in 7d · last 2026-10-27 11:39 · Paul Moore et al.
• selinux security module Supported
  12 messages in 7d · last 2026-10-27 11:39 · Paul Moore et al.
• smack security module
  10 messages in 7d · last 2026-10-27 11:39 · Casey Schaufler
• ecrypt file system Odd Fixes
  9 messages in 7d · last 2026-10-29 16:07 · Tyler Hicks
• kernel selftest framework
  7 messages in 7d · last 2026-10-29 16:09 · Shuah Khan et al.
• kernel nfsd, sunrpc, and lockd servers Supported
  7 messages in 7d · last 2026-10-27 11:39 · Chuck Lever et al.
• extended verification module (evm) Supported
  7 messages in 7d · last 2026-10-27 11:39 · Mimi Zohar et al.
• integrity measurement architecture (ima) Supported
  7 messages in 7d · last 2026-10-27 11:39 · Mimi Zohar et al.
• kernel smb3 server (ksmbd)
  7 messages in 7d · last 2026-10-27 11:38 · Namjae Jeon et al.
• exfat file system
  6 messages in 7d · last 2026-11-01 01:57 · Namjae Jeon et al.
• documentation
  5 messages in 7d · last 2026-11-01 09:37 · Jonathan Corbet
• filesystems (vfs and infrastructure)
  5 messages in 7d · last 2026-11-01 01:57 · Alexander Viro et al.
• bpf [general] (safe dynamic programs and tools) Supported
  5 messages in 7d · last 2026-10-27 11:39 · Alexei Starovoitov et al.
• filesystems [iomap] Supported
  4 messages in 7d · last 2026-10-29 20:51 · Christian Brauner
• landlock security module Supported
  4 messages in 7d · last 2026-10-27 11:39 · Mickaël Salaün
• bpf [security & lsm] (security audit and enforcement using bpf)
  4 messages in 7d · last 2026-10-27 11:39 · KP Singh et al.
• userspace copyin/copyout (uiovec)
  4 messages in 7d · last 2026-10-26 21:52 · Alexander Viro
• ext4 file system
  3 messages in 7d · last 2026-10-29 16:09 · "Theodore Ts'o"
• ntfs filesystem
  3 messages in 7d · last 2026-10-29 16:08 · Namjae Jeon et al.
• vfat/fat/msdos filesystem
  3 messages in 7d · last 2026-10-29 16:07 · OGAWA Hirofumi
• bpf [selftests] (test runners & infrastructure)
  3 messages in 7d · last 2026-10-27 11:39 · Andrii Nakryiko et al.
• xfs filesystem Supported
  2 messages in 7d · last 2026-10-29 16:09 · Carlos Maiolino
• gfs2 file system Supported
  2 messages in 7d · last 2026-10-29 16:09 · Andreas Gruenbacher
• zonefs filesystem
  2 messages in 7d · last 2026-10-29 16:08 · Damien Le Moal et al.
• oracle cluster filesystem 2 (ocfs2) Supported
  2 messages in 7d · last 2026-10-29 16:08 · Mark Fasheh et al.
• hfs filesystem
  2 messages in 7d · last 2026-10-29 16:08 · Viacheslav Dubeyko et al.
• memory management
  2 messages in 7d · last 2026-10-29 16:07 · Andrew Morton
• memory management - core
  2 messages in 7d · last 2026-10-29 16:07 · Andrew Morton et al.
• tracing
  2 messages in 7d · last 2026-10-27 11:38 · Steven Rostedt et al.
• bpf [tracing]
  2 messages in 7d · last 2026-10-27 11:38 · Song Liu
• block layer
  2 messages in 7d · last 2026-10-27 11:38 · Jens Axboe
• zoned loop device
  2 messages in 7d · last 2026-10-27 11:38 · Damien Le Moal
• cachefiles: fs-cache backend for caching on mounted filesystems Supported
  2 messages in 7d · last 2026-10-27 11:38 · David Howells
• driver core, kobjects, debugfs and sysfs Supported
  2 messages in 7d · last 2026-10-27 11:38 · Greg Kroah-Hartman et al.
• ntfs3 filesystem Supported
  1 message in 7d · last 2026-11-01 01:57 · Konstantin Komarov
• ubi file system (ubifs) Supported
  1 message in 7d · last 2026-10-29 16:09 · Richard Weinberger
• efi variable filesystem
  1 message in 7d · last 2026-10-29 16:09 · Jeremy Kerr et al.
• hpfs filesystem
  1 message in 7d · last 2026-10-29 16:08 · Mikulas Patocka
• affs file system Odd Fixes
  1 message in 7d · last 2026-10-29 16:08 · David Sterba
• hfsplus filesystem
  1 message in 7d · last 2026-10-29 16:08 · Viacheslav Dubeyko et al.
• nilfs2 filesystem
  1 message in 7d · last 2026-10-29 16:07 · Ryusuke Konishi et al.
• jfs filesystem Odd Fixes
  1 message in 7d · last 2026-10-29 16:07 · Dave Kleikamp
• ext2 file system
  1 message in 7d · last 2026-10-29 16:07 · Jan Kara
• diskquota
  1 message in 7d · last 2026-10-29 16:07 · Jan Kara
• generic include/asm header files
  1 message in 7d · last 2026-10-27 18:32 · Arnd Bergmann
• apparmor security module Supported
  1 message in 7d · last 2026-10-27 11:38 · John Johansen et al.
• tomoyo security module
  1 message in 7d · last 2026-10-27 11:38 · Kentaro Takeda et al.
• capabilities Supported
  1 message in 7d · last 2026-10-27 11:38 · Serge Hallyn
• nios2 architecture Supported
  1 message in 7d · last 2026-10-26 23:41 · Dinh Nguyen et al.
• tensilica xtensa port (xtensa)
  1 message in 7d · last 2026-10-26 23:41 · Chris Zankel et al.
• scsi subsystem
  1 message in 7d · last 2026-10-26 21:52 · "James E.J. Bottomley" et al.