[PATCH v2 00/15] ceph: add binary logging (BLOG) for CephFS

Add a lightweight binary logging subsystem for CephFS that replaces the
existing dout/doutc text-based debug logging with a binary-serialized
format.  Log entries are stored in per-task 128KB page-fragment buffers
and exposed through debugfs for offline analysis.

Changes since v1 (based on review from Xiubo Li, thanks):
  - 01/15: populate public headers with struct definitions and API
    declarations; v1 shipped them as empty 0-byte files making the
    series unbuildable at every commit boundary
  - 02/15: blog_des.c: pr_err → pr_err_ratelimited (debugfs read path
    is user-triggerable), -EFAULT → -EBADMSG for bad serialized data,
    fix snprintf truncation off-by-one when ret >= remaining, extract
    des_advance() helper to deduplicate the snprintf+advance pattern
  - 07/15: linux/sched.h now included via the populated blog.h header
    chain, fixing the implicit dependency on `current`
  - 10/15: remove unnecessary IS_ENABLED(CONFIG_CEPH_FS) guards around
    ceph_blog_debugfs_init/cleanup in debugfs.c — this is CephFS-only
    code where CONFIG_CEPH_FS is always true

Alex Markuze (15):
  ceph: add BLOG public headers
  ceph: add BLOG deserialization support
  ceph: add BLOG page-fragment allocator
  ceph: add BLOG magazine batch allocator
  ceph: add BLOG logger core
  ceph: add BLOG per-module context management
  ceph: add Ceph BLOG scaffolding
  ceph: add bout and boutc wrappers for BLOG
  ceph: switch MDS request plumbing to struct ceph_journal_info
  ceph: add BLOG debugfs interface
  ceph: convert VFS inode and directory paths to bout
  ceph: convert VFS data I/O paths to bout
  ceph: convert capability and snapshot paths to bout
  ceph: convert remaining helper paths to bout
  selftests: add Ceph BLOG smoke test and collection helpers

 MAINTAINERS                                   |   1 +
 fs/ceph/Makefile                              |   6 +
 fs/ceph/addr.c                                | 168 ++---
 fs/ceph/blog_batch.c                          | 312 ++++++++++
 fs/ceph/blog_client.c                         | 266 ++++++++
 fs/ceph/blog_core.c                           | 424 +++++++++++++
 fs/ceph/blog_debugfs.c                        | 434 +++++++++++++
 fs/ceph/blog_des.c                            | 332 ++++++++++
 fs/ceph/blog_module.c                         | 584 ++++++++++++++++++
 fs/ceph/blog_pagefrag.c                       |  95 +++
 fs/ceph/caps.c                                | 252 ++++----
 fs/ceph/crypto.c                              |  14 +-
 fs/ceph/debugfs.c                             |  19 +-
 fs/ceph/dir.c                                 | 290 ++++++---
 fs/ceph/export.c                              |  83 ++-
 fs/ceph/file.c                                | 274 +++++---
 fs/ceph/inode.c                               | 233 ++++---
 fs/ceph/ioctl.c                               |   6 +-
 fs/ceph/locks.c                               |  66 +-
 fs/ceph/mds_client.c                          | 293 ++++-----
 fs/ceph/mdsmap.c                              |   8 +-
 fs/ceph/quota.c                               |   2 +-
 fs/ceph/snap.c                                |  66 +-
 fs/ceph/super.c                               |  58 +-
 fs/ceph/super.h                               |   5 +
 fs/ceph/xattr.c                               |  88 ++-
 include/linux/ceph/blog.h                     | 196 ++++++
 include/linux/ceph/blog_batch.h               |  44 ++
 include/linux/ceph/blog_des.h                 |  16 +
 include/linux/ceph/blog_module.h              |  91 +++
 include/linux/ceph/blog_pagefrag.h            |  32 +
 include/linux/ceph/blog_ser.h                 | 270 ++++++++
 include/linux/ceph/ceph_blog.h                | 284 +++++++++
 include/linux/ceph/ceph_debug.h               |  44 +-
 include/linux/ceph/libceph.h                  |   2 +
 tools/testing/selftests/Makefile              |   1 +
 tools/testing/selftests/ceph_blog/Makefile    |   7 +
 .../selftests/ceph_blog/blog_analyze.sh       | 124 ++++
 .../selftests/ceph_blog/blog_collect.sh       | 116 ++++
 .../selftests/ceph_blog/blog_smoke_test.sh    | 363 +++++++++++
 tools/testing/selftests/ceph_blog/config      |   2 +
 41 files changed, 5218 insertions(+), 753 deletions(-)
 create mode 100644 fs/ceph/blog_batch.c
 create mode 100644 fs/ceph/blog_client.c
 create mode 100644 fs/ceph/blog_core.c
 create mode 100644 fs/ceph/blog_debugfs.c
 create mode 100644 fs/ceph/blog_des.c
 create mode 100644 fs/ceph/blog_module.c
 create mode 100644 fs/ceph/blog_pagefrag.c
 create mode 100644 include/linux/ceph/blog.h
 create mode 100644 include/linux/ceph/blog_batch.h
 create mode 100644 include/linux/ceph/blog_des.h
 create mode 100644 include/linux/ceph/blog_module.h
 create mode 100644 include/linux/ceph/blog_pagefrag.h
 create mode 100644 include/linux/ceph/blog_ser.h
 create mode 100644 include/linux/ceph/ceph_blog.h
 create mode 100644 tools/testing/selftests/ceph_blog/Makefile
 create mode 100644 tools/testing/selftests/ceph_blog/blog_analyze.sh
 create mode 100644 tools/testing/selftests/ceph_blog/blog_collect.sh
 create mode 100644 tools/testing/selftests/ceph_blog/blog_smoke_test.sh
 create mode 100644 tools/testing/selftests/ceph_blog/config

-- 
2.34.1