[PATCH 4/5] io_uring: mark requests that we can do poll async in io_op_defs

[Jens Axboe <axboe@xxxxxxxxx>]

Add a pollin/pollout field to the request table, and have commands that
we can safely poll for properly marked.

Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
---
 fs/io_uring.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index db64c7dd0f58..890f28527c8b 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -634,6 +634,9 @@ struct io_op_def {
 	unsigned		file_table : 1;
 	/* needs ->fs */
 	unsigned		needs_fs : 1;
+	/* set if opcode supports polled "wait" */
+	unsigned		pollin : 1;
+	unsigned		pollout : 1;
 };
 
 static const struct io_op_def io_op_defs[] = {
@@ -643,6 +646,7 @@ static const struct io_op_def io_op_defs[] = {
 		.needs_mm		= 1,
 		.needs_file		= 1,
 		.unbound_nonreg_file	= 1,
+		.pollin			= 1,
 	},
 	[IORING_OP_WRITEV] = {
 		.async_ctx		= 1,
@@ -650,6 +654,7 @@ static const struct io_op_def io_op_defs[] = {
 		.needs_file		= 1,
 		.hash_reg_file		= 1,
 		.unbound_nonreg_file	= 1,
+		.pollout		= 1,
 	},
 	[IORING_OP_FSYNC] = {
 		.needs_file		= 1,
@@ -657,11 +662,13 @@ static const struct io_op_def io_op_defs[] = {
 	[IORING_OP_READ_FIXED] = {
 		.needs_file		= 1,
 		.unbound_nonreg_file	= 1,
+		.pollin			= 1,
 	},
 	[IORING_OP_WRITE_FIXED] = {
 		.needs_file		= 1,
 		.hash_reg_file		= 1,
 		.unbound_nonreg_file	= 1,
+		.pollout		= 1,
 	},
 	[IORING_OP_POLL_ADD] = {
 		.needs_file		= 1,
@@ -677,6 +684,7 @@ static const struct io_op_def io_op_defs[] = {
 		.needs_file		= 1,
 		.unbound_nonreg_file	= 1,
 		.needs_fs		= 1,
+		.pollout		= 1,
 	},
 	[IORING_OP_RECVMSG] = {
 		.async_ctx		= 1,
@@ -684,6 +692,7 @@ static const struct io_op_def io_op_defs[] = {
 		.needs_file		= 1,
 		.unbound_nonreg_file	= 1,
 		.needs_fs		= 1,
+		.pollin			= 1,
 	},
 	[IORING_OP_TIMEOUT] = {
 		.async_ctx		= 1,
@@ -695,6 +704,7 @@ static const struct io_op_def io_op_defs[] = {
 		.needs_file		= 1,
 		.unbound_nonreg_file	= 1,
 		.file_table		= 1,
+		.pollin			= 1,
 	},
 	[IORING_OP_ASYNC_CANCEL] = {},
 	[IORING_OP_LINK_TIMEOUT] = {
@@ -706,6 +716,7 @@ static const struct io_op_def io_op_defs[] = {
 		.needs_mm		= 1,
 		.needs_file		= 1,
 		.unbound_nonreg_file	= 1,
+		.pollout		= 1,
 	},
 	[IORING_OP_FALLOCATE] = {
 		.needs_file		= 1,
@@ -734,11 +745,13 @@ static const struct io_op_def io_op_defs[] = {
 		.needs_mm		= 1,
 		.needs_file		= 1,
 		.unbound_nonreg_file	= 1,
+		.pollin			= 1,
 	},
 	[IORING_OP_WRITE] = {
 		.needs_mm		= 1,
 		.needs_file		= 1,
 		.unbound_nonreg_file	= 1,
+		.pollout		= 1,
 	},
 	[IORING_OP_FADVISE] = {
 		.needs_file		= 1,
@@ -750,11 +763,13 @@ static const struct io_op_def io_op_defs[] = {
 		.needs_mm		= 1,
 		.needs_file		= 1,
 		.unbound_nonreg_file	= 1,
+		.pollout		= 1,
 	},
 	[IORING_OP_RECV] = {
 		.needs_mm		= 1,
 		.needs_file		= 1,
 		.unbound_nonreg_file	= 1,
+		.pollin			= 1,
 	},
 	[IORING_OP_OPENAT2] = {
 		.needs_file		= 1,
-- 
2.25.1