diff options
| author | Pavel Begunkov <asml.silence@gmail.com> | 2021-08-25 13:25:45 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-08-25 14:36:56 +0200 |
| commit | b9445598d8c60a1379887b957024b71343965f74 (patch) | |
| tree | 3856ba1497b101941bb77d6aabe078808df08136 /include | |
| parent | net: add accept helper not installing fd (diff) | |
| download | linux-b9445598d8c60a1379887b957024b71343965f74.tar.xz linux-b9445598d8c60a1379887b957024b71343965f74.zip | |
io_uring: openat directly into fixed fd table
Instead of opening a file into a process's file table as usual and then
registering the fd within io_uring, some users may want to skip the
first step and place it directly into io_uring's fixed file table.
This patch adds such a capability for IORING_OP_OPENAT and
IORING_OP_OPENAT2.
The behaviour is controlled by setting sqe->file_index, where 0 implies
the old behaviour using normal file tables. If non-zero value is
specified, then it will behave as described and place the file into a
fixed file slot sqe->file_index - 1. A file table should be already
created, the slot should be valid and empty, otherwise the operation
will fail.
Keep the error codes consistent with IORING_OP_FILES_UPDATE, ENXIO and
EINVAL on inappropriate fixed tables, and return EBADF on collision with
already registered file.
Note: IOSQE_FIXED_FILE can't be used to switch between modes, because
accept takes a file, and it already uses the flag with a different
meaning.
Suggested-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/r/e9b33d1163286f51ea707f87d95bd596dada1e65.1629888991.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/io_uring.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 79126d5cd289..45a4f2373694 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -55,7 +55,10 @@ struct io_uring_sqe { } __attribute__((packed)); /* personality to use, if used */ __u16 personality; - __s32 splice_fd_in; + union { + __s32 splice_fd_in; + __u32 file_index; + }; __u64 __pad2[2]; }; |