[RFC 0/5] implement asynchronous BLKDISCARD via io_uring

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

There is an interest in having asynchronous block operations like
discard. The patch set implements that as io_uring commands, which is
an io_uring request type allowing to implement custom file specific
operations.

First 4 patches are simple preps, and the main part is in Patch 5.
Not tested with a real drive yet, hence sending as an RFC.

I'm also going to add BLKDISCARDZEROES and BLKSECDISCARD, which should
reuse structures and helpers from Patch 5.

liburing tests for reference:

https://github.com/isilence/liburing.git discard-cmd-test

Pavel Begunkov (5):
  io_uring/cmd: expose iowq to cmds
  io_uring/cmd: give inline space in request to cmds
  filemap: introduce filemap_invalidate_pages
  block: introduce blk_validate_discard()
  block: implement io_uring discard cmd

 block/blk.h                  |   1 +
 block/fops.c                 |   2 +
 block/ioctl.c                | 139 ++++++++++++++++++++++++++++++-----
 include/linux/io_uring/cmd.h |  15 ++++
 include/linux/pagemap.h      |   2 +
 include/uapi/linux/fs.h      |   2 +
 io_uring/io_uring.c          |  11 +++
 io_uring/io_uring.h          |   1 +
 io_uring/uring_cmd.c         |   7 ++
 mm/filemap.c                 |  18 +++--
 10 files changed, 176 insertions(+), 22 deletions(-)

-- 
2.45.2