[PATCH v4 0/4] btrfs: fix reading from userspace in btrfs_uring_encoded_read()

[Mark Harmstone <maharmstone@fb.com>]

Version 4 of mine and Jens' patches, to make sure that when our io_uring
function gets called a second time, it doesn't accidentally read
something from userspace that's gone out of scope or otherwise gotten
corrupted.

I sent a version 3 on December 17, but it looks like that got forgotten
about over Christmas (unsurprisingly). Version 4 fixes a problem that I
noticed, namely that we weren't taking a copy of the iovs, which also
necessitated creating a struct to store these things in. This does
simplify things by removing the need for the kmemdup, however.

I also have a patch for io_uring encoded writes ready to go, but it's
waiting on some of the stuff introduced here.

Jens Axboe (2):
  io_uring/cmd: rename struct uring_cache to io_uring_cmd_data
  io_uring/cmd: add per-op data to struct io_uring_cmd_data

Mark Harmstone (2):
  io_uring: add io_uring_cmd_get_async_data helper
  btrfs: don't read from userspace twice in btrfs_uring_encoded_read()

 fs/btrfs/ioctl.c             | 125 +++++++++++++++++++----------------
 include/linux/io_uring/cmd.h |  10 +++
 io_uring/io_uring.c          |   2 +-
 io_uring/opdef.c             |   3 +-
 io_uring/uring_cmd.c         |  23 +++++--
 io_uring/uring_cmd.h         |   4 --
 6 files changed, 97 insertions(+), 70 deletions(-)

-- 
2.45.2