diff options
| author | Pavel Begunkov <asml.silence@gmail.com> | 2024-11-15 16:54:43 +0000 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2024-11-15 12:28:38 -0700 |
| commit | d617b3147d54c42351eac63b5398d4ddf4f4011b (patch) | |
| tree | 9ef5fadb2c80f441e9a65ad9d81ef8dacef1c8d7 /include/uapi/linux | |
| parent | 93238e66185524aad925acefb2312203b9e26d63 (diff) | |
io_uring: restore back registered wait arguments
Now we've got a more generic region registration API, place
IORING_ENTER_EXT_ARG_REG and re-enable it.
First, the user has to register a region with the
IORING_MEM_REGION_REG_WAIT_ARG flag set. It can only be done for a
ring in a disabled state, aka IORING_SETUP_R_DISABLED, to avoid races
with already running waiters. With that we should have stable constant
values for ctx->cq_wait_{size,arg} in io_get_ext_arg_reg() and hence no
READ_ONCE required.
The other API difference is that we're now passing byte offsets instead
of indexes. The user _must_ align all offsets / pointers to the native
word size, failing to do so might but not necessarily has to lead to a
failure usually returned as -EFAULT. liburing will be hiding this
details from users.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/81822c1b4ffbe8ad391b4f9ad1564def0d26d990.1731689588.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/uapi/linux')
| -rw-r--r-- | include/uapi/linux/io_uring.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 1ee35890125b..4418d0192959 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -663,6 +663,11 @@ struct io_uring_region_desc { __u64 __resv[4]; }; +enum { + /* expose the region as registered wait arguments */ + IORING_MEM_REGION_REG_WAIT_ARG = 1, +}; + struct io_uring_mem_region_reg { __u64 region_uptr; /* struct io_uring_region_desc * */ __u64 flags; |