[PATCH v2 0/2] io_uring: add fremovexattr and flistxattr support

[Aditya Prakash Srivastava <aditya.ansh182@gmail.com>]

This series completes io_uring's FD-based xattr operations by adding
support for:
- IORING_OP_FREMOVEXATTR
- IORING_OP_FLISTXATTR

This allows asynchronous xattr removal and listing. Support is restricted
to FD-based operations on registered files to avoid path lookup overhead.

Corresponding test suite modifications have been integrated into the
official liburing test suite (test/xattr.c) and verified to pass
successfully. A corresponding liburing patch implementing these prep
helpers, sanitizers, and test cases is following this kernel series.

- Patch 1 makes the necessary VFS-layer list/remove helpers non-static
  and declares them in fs/internal.h.
- Patch 2 implements the io_uring operational support (opcodes, opdefs,
  preparation, and issue handlers) and invokes these exposed helpers.

Changes since v1:
- Omit path-based opcodes to prioritize optimal FD-based variants.
- Limit exported VFS helpers to only file_listxattr and file_removexattr.
- Rewrite standalone test program into a standard liburing testcase.

Aditya Prakash Srivastava (2):
  fs: make file_listxattr and file_removexattr helpers non-static
  io_uring: add fremovexattr and flistxattr support

 fs/internal.h                       |  2 +
 fs/xattr.c                          | 10 ++--
 include/uapi/linux/io_uring.h       |  2 +
 io_uring/opdef.c                    | 18 +++++++
 io_uring/xattr.c                    | 74 +++++++++++++++++++++++++++++
 io_uring/xattr.h                    |  6 +++
 tools/include/uapi/linux/io_uring.h | 13 +++++
 7 files changed, 119 insertions(+), 6 deletions(-)

-- 
2.47.3