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

On Mon, 2026-07-06 at 14:38 +0000, Alex Markuze wrote:
> 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

I have troubles to apply the patchset on 7.2-rc2 kernel version:

b4 shazam
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---
  ✓ [PATCH v2 1/15] ceph: add BLOG public headers
  ✓ [PATCH v2 2/15] ceph: add BLOG deserialization support
  ✓ [PATCH v2 3/15] ceph: add BLOG page-fragment allocator
  ✓ [PATCH v2 4/15] ceph: add BLOG magazine batch allocator
  ✓ [PATCH v2 5/15] ceph: add BLOG logger core
  ✓ [PATCH v2 6/15] ceph: add BLOG per-module context management
  ✓ [PATCH v2 7/15] ceph: add Ceph BLOG scaffolding
  ✓ [PATCH v2 8/15] ceph: add bout and boutc wrappers for BLOG
  ✓ [PATCH v2 9/15] ceph: switch MDS request plumbing to struct
ceph_journal_info
  ✓ [PATCH v2 10/15] ceph: add BLOG debugfs interface
  ✓ [PATCH v2 11/15] ceph: convert VFS inode and directory paths to bout
  ✓ [PATCH v2 12/15] ceph: convert VFS data I/O paths to bout
  ✓ [PATCH v2 13/15] ceph: convert capability and snapshot paths to bout
  ✓ [PATCH v2 14/15] ceph: convert remaining helper paths to bout
  ✓ [PATCH v2 15/15] selftests: add Ceph BLOG smoke test and collection helpers
  ---
  ✓ Signed: DKIM/redhat.com
---
Total patches: 15
---
Applying: ceph: add BLOG public headers
Applying: ceph: add BLOG deserialization support
Applying: ceph: add BLOG page-fragment allocator
Applying: ceph: add BLOG magazine batch allocator
Applying: ceph: add BLOG logger core
Applying: ceph: add BLOG per-module context management
Applying: ceph: add Ceph BLOG scaffolding
Applying: ceph: add bout and boutc wrappers for BLOG
Applying: ceph: switch MDS request plumbing to struct ceph_journal_info
Patch failed at 0009 ceph: switch MDS request plumbing to struct
ceph_journal_info
error: patch failed: fs/ceph/mds_client.c:2272
error: fs/ceph/mds_client.c: patch does not apply
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config set advice.mergeConflict false"

Thanks,
Slava.