[PATCH v4 0/6] io_uring/mock: add basic infra for test mock files

[Pavel Begunkov <asml.silence@gmail.com>]

io_uring commands provide an ioctl style interface for files to
implement file specific operations. io_uring provides many features and
advanced api to commands, and it's getting hard to test as it requires
specific files/devices.

Add basic infrastucture for creating special mock files that will be
implementing the cmd api and using various io_uring features we want to
test. It'll also be useful to test some more obscure read/write/polling
edge cases in the future, which was initially suggested by Chase.

v4: require CAP_ADMIN and limit to KASAN builds
v3: fix memleak, + release fop callback
v2: add rw support with basic options
    implement features not as bitmask but sequence number

Pavel Begunkov (6):
  io_uring/mock: add basic infra for test mock files
  io_uring/mock: add cmd using vectored regbufs
  io_uring/mock: add sync read/write
  io_uring/mock: allow to choose FMODE_NOWAIT
  io_uring/mock: support for async read/write
  io_uring/mock: add trivial poll handler

 init/Kconfig         |  11 ++
 io_uring/Makefile    |   1 +
 io_uring/mock_file.c | 357 +++++++++++++++++++++++++++++++++++++++++++
 io_uring/mock_file.h |  47 ++++++
 4 files changed, 416 insertions(+)
 create mode 100644 io_uring/mock_file.c
 create mode 100644 io_uring/mock_file.h

-- 
2.49.0