[PATCH v3 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.

New test cases have been added to the liburing test suite (test/xattr.c)
and verified to pass. A separate userspace patch implementing the matching
prep helpers, sanitizers, and test cases is submitted in parallel.

- 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 v2:
- Revert unnecessary formatting changes to filename_listxattr in Patch 1.

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                          |  3 +-
 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, 116 insertions(+), 2 deletions(-)

-- 
2.47.3