From 992da01aa932b432ef8dc3885fa76415b5dbe43f Mon Sep 17 00:00:00 2001
From: Pavel Begunkov <asml.silence@gmail.com>
Date: Thu, 10 Jun 2021 16:37:37 +0100
Subject: io_uring: change registration/upd/rsrc tagging ABI
There are ABI moments about recently added rsrc registration/update and
tagging that might become a nuisance in the future. First,
IORING_REGISTER_RSRC[_UPD] hide different types of resources under it,
so breaks fine control over them by restrictions. It works for now, but
once those are wanted under restrictions it would require a rework.
It was also inconvenient trying to fit a new resource not supporting
all the features (e.g. dynamic update) into the interface, so better
to return to IORING_REGISTER_* top level dispatching.
Second, register/update were considered to accept a type of resource,
however that's not a good idea because there might be several ways of
registration of a single resource type, e.g. we may want to add
non-contig buffers or anything more exquisite as dma mapped memory.
So, remove IORING_RSRC_[FILE,BUFFER] out of the ABI, and place them
internally for now to limit changes.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/9b554897a7c17ad6e3becc48dfed2f7af9f423d5.1623339162.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
include/uapi/linux/io_uring.h | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)
(limited to 'include')
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index e1ae46683301..48b4ddcd56ff 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -298,8 +298,12 @@ enum {
IORING_UNREGISTER_PERSONALITY = 10,
IORING_REGISTER_RESTRICTIONS = 11,
IORING_REGISTER_ENABLE_RINGS = 12,
- IORING_REGISTER_RSRC = 13,
- IORING_REGISTER_RSRC_UPDATE = 14,
+
+ /* extended with tagging */
+ IORING_REGISTER_FILES2 = 13,
+ IORING_REGISTER_FILES_UPDATE2 = 14,
+ IORING_REGISTER_BUFFERS2 = 15,
+ IORING_REGISTER_BUFFERS_UPDATE = 16,
/* this goes last */
IORING_REGISTER_LAST
@@ -312,14 +316,10 @@ struct io_uring_files_update {
__aligned_u64 /* __s32 * */ fds;
};
-enum {
- IORING_RSRC_FILE = 0,
- IORING_RSRC_BUFFER = 1,
-};
-
struct io_uring_rsrc_register {
- __u32 type;
__u32 nr;
+ __u32 resv;
+ __u64 resv2;
__aligned_u64 data;
__aligned_u64 tags;
};
@@ -335,8 +335,8 @@ struct io_uring_rsrc_update2 {
__u32 resv;
__aligned_u64 data;
__aligned_u64 tags;
- __u32 type;
__u32 nr;
+ __u32 resv2;
};
/* Skip updating fd indexes set to this value in the fd table */
--
cgit v1.2.3-70-g09d2
From 9690557e22d63f13534fd167d293ac8ed8b104f9 Mon Sep 17 00:00:00 2001
From: Pavel Begunkov <asml.silence@gmail.com>
Date: Thu, 10 Jun 2021 16:37:38 +0100
Subject: io_uring: add feature flag for rsrc tags
Add IORING_FEAT_RSRC_TAGS indicating that io_uring supports a bunch of
new IORING_REGISTER operations, in particular
IORING_REGISTER_[FILES[,UPDATE]2,BUFFERS[2,UPDATE]] that support rsrc
tagging, and also indicating implemented dynamic fixed buffer updates.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/9b995d4045b6c6b4ab7510ca124fd25ac2203af7.1623339162.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
fs/io_uring.c | 3 ++-
include/uapi/linux/io_uring.h | 1 +
2 files changed, 3 insertions(+), 1 deletion(-)
(limited to 'include')
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 663fef3d56df..fa8794c61af7 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -9676,7 +9676,8 @@ static int io_uring_create(unsigned entries, struct io_uring_params *p,
IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS |
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_EXT_ARG | IORING_FEAT_NATIVE_WORKERS |
+ IORING_FEAT_RSRC_TAGS;
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 48b4ddcd56ff..162ff99ed2cb 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -280,6 +280,7 @@ struct io_uring_params {
#define IORING_FEAT_SQPOLL_NONFIXED (1U << 7)
#define IORING_FEAT_EXT_ARG (1U << 8)
#define IORING_FEAT_NATIVE_WORKERS (1U << 9)
+#define IORING_FEAT_RSRC_TAGS (1U << 10)
/*
* io_uring_register(2) opcodes and arguments
--
cgit v1.2.3-70-g09d2