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Revert "io_uring/epoll: disallow adding an epoll file to an epoll context"

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Turns out that my naive assumption that surely nobody is using io_uring
to manage nested epoll instances was wrong - libuv is in fact doing that
very thing. Since we have users in the wild using that feature, we
cannot remove it from upstream. Revert the commit that introduced that
limitation.

This reverts commit cfa1539b24.

Link: https://lore.kernel.org/io-uring/605939add4dfb674bd7ab39ef8dbd3fd22e754e4.camel@xry111.site/
Reported-by: Xi Ruoyao <xry111@xry111.site>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2026-07-30 10:36:06 -06:00
parent 0b88f47058
commit 9db03d2116
1 changed files with 0 additions and 3 deletions
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io_uring/epoll.c
-3
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@@ -62,9 +62,6 @@ int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags)
CLASS(fd, tf)(ie->fd);
if (fd_empty(tf))
return -EBADF;
/* disallow adding an epoll context to another epoll context */
if (ie->op == EPOLL_CTL_ADD && is_file_epoll(fd_file(tf)))
return -EINVAL;
key.file = fd_file(tf);
key.fd = ie->fd;