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io_uring: allow allocated fixed files for accept

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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,
and also allows multi-shot support to work with fixed files.

Normal accept 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>
This commit is contained in:
Jens Axboe 2022-05-07 10:08:31 -06:00
parent 1339f24b33
commit c30c3e00cb
1 changed files with 2 additions and 2 deletions
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4
fs/io_uring.c
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@ -5805,8 +5805,8 @@ static int io_accept(struct io_kiocb *req, unsigned int issue_flags)
fd_install(fd, file);
ret = fd;
} else {
ret = io_install_fixed_file(req, file, issue_flags,
accept->file_slot - 1);
ret = io_fixed_fd_install(req, issue_flags, file,
accept->file_slot);
}
__io_req_complete(req, issue_flags, ret, 0);
return 0;