io_uring: change the poll type to be 32-bits

poll events should be 32-bits to cover EPOLLEXCLUSIVE. Explicit word-swap the poll32_events for big endian to make sure the ABI is not changed. We call this feature IORING_FEAT_POLL_32BITS, applications who want to use EPOLLEXCLUSIVE should check the feature bit first.

Jiufei Xue committed 6 years ago

Commit 5769a351 parent 48778463 files · +17 −6Browse files

Showing the changes to include/uapi/linux (1 of 3 files). Show all

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include/uapi/linux/io_uring.h+3−1

@@ -31,7 +31,8 @@ struct io_uring_sqe { · 30 unmodified lines
31	31	union {
32	32	__kernel_rwf_t rw_flags;
33	33	__u32 fsync_flags;
34		− __u16 poll_events;
	34	+ __u16 poll_events; /* compatibility */
	35	+ __u32 poll32_events; /* word-reversed for BE */
35	36	__u32 sync_range_flags;
36	37	__u32 msg_flags;
37	38	__u32 timeout_flags;
@@ -248,6 +249,7 @@ struct io_uring_params { · 210 unmodified lines
248	249	#define IORING_FEAT_RW_CUR_POS (1U << 3)
249	250	#define IORING_FEAT_CUR_PERSONALITY (1U << 4)
250	251	#define IORING_FEAT_FAST_POLL (1U << 5)
	252	+#define IORING_FEAT_POLL_32BITS (1U << 6)
251	253
252	254	/*
253	255	* io_uring_register(2) opcodes and arguments