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| author |   Jens Axboe <axboe@kernel.dk> | 2022-05-07 14:18:44 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-05-13 06:28:42 -0600 |
| commit | 1339f24b336db5ded9811f3fe7b948e0de207785 (patch) | |
| tree | a53dff3d094d2847e56ee4ebb870555606c19801 /include/uapi | |
| parent | io_uring: add basic fixed file allocator (diff) | |
| download | linux-dev-1339f24b336db5ded9811f3fe7b948e0de207785.tar.xz linux-dev-1339f24b336db5ded9811f3fe7b948e0de207785.zip | |
io_uring: allow allocated fixed files for openat/openat2
If the application passes in IORING_FILE_INDEX_ALLOC as the file_slot,
then that's a hint to allocate a fixed file descriptor rather than have
one be passed in directly.
This can be useful for having io_uring manage the direct descriptor space.
Normal open direct requests will complete with 0 for success, and < 0
in case of error. If io_uring is asked to allocated the direct descriptor,
then the direct descriptor is returned in case of success.
Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/linux/io_uring.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 06621a278cb6..b7f02a55032a 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -63,6 +63,15 @@ struct io_uring_sqe { __u64 __pad2[2]; }; +/* + * If sqe->file_index is set to this for opcodes that instantiate a new + * direct descriptor (like openat/openat2/accept), then io_uring will allocate + * an available direct descriptor instead of having the application pass one + * in. The picked direct descriptor will be returned in cqe->res, or -ENFILE + * if the space is full. + */ +#define IORING_FILE_INDEX_ALLOC (~0U) + enum { IOSQE_FIXED_FILE_BIT, IOSQE_IO_DRAIN_BIT, |