This is a note to let you know that I've just added the patch titled io_uring: flag the fact that linked file assignment is sane to the 5.17-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: io_uring-flag-the-fact-that-linked-file-assignment-i.patch and it can be found in the queue-5.17 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 87064a78d25ca2e2308140938273ff7e31cd08b0 Author: Jens Axboe <axboe@xxxxxxxxx> Date: Sun Apr 10 15:13:24 2022 -0600 io_uring: flag the fact that linked file assignment is sane [ Upstream commit c4212f3eb89fd5654f0a6ed2ee1d13fcb86cb664 ] Give applications a way to tell if the kernel supports sane linked files, as in files being assigned at the right time to be able to reliably do <open file direct into slot X><read file from slot X> while using IOSQE_IO_LINK to order them. Not really a bug fix, but flag it as such so that it gets pulled in with backports of the deferred file assignment. Fixes: 6bf9c47a3989 ("io_uring: defer file assignment") Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/fs/io_uring.c b/fs/io_uring.c index 1a9630dc5361..d13f142793f2 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -10566,7 +10566,8 @@ static __cold int io_uring_create(unsigned entries, struct io_uring_params *p, IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS | - IORING_FEAT_RSRC_TAGS | IORING_FEAT_CQE_SKIP; + IORING_FEAT_RSRC_TAGS | IORING_FEAT_CQE_SKIP | + IORING_FEAT_LINKED_FILE; if (copy_to_user(params, p, sizeof(*p))) { ret = -EFAULT; diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 787f491f0d2a..1e45368ad33f 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -293,6 +293,7 @@ struct io_uring_params { #define IORING_FEAT_NATIVE_WORKERS (1U << 9) #define IORING_FEAT_RSRC_TAGS (1U << 10) #define IORING_FEAT_CQE_SKIP (1U << 11) +#define IORING_FEAT_LINKED_FILE (1U << 12) /* * io_uring_register(2) opcodes and arguments