io_uring: add missing item types for various requests

Any read/write should grab current->nsproxy, denoted by IO_WQ_WORK_FILES
as it refers to current->files as well, and connect and recv/recvmsg,
send/sendmsg should grab current->fs which is denoted by IO_WQ_WORK_FS.

No upstream commit exists for this issue.

Reported-by: Bing-Jhong Billy Jheng <billy@starlabs.sg>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

fs/io_uring.c

@@ -773,7 +773,8 @@ static const struct io_op_def io_op_defs[] = {
 		.buffer_select		= 1,
 		.needs_async_data	= 1,
 		.async_size		= sizeof(struct io_async_rw),
-		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG,
+		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
+					  IO_WQ_WORK_FILES,
 	},
 	[IORING_OP_WRITEV] = {
 		.needs_file		= 1,
@@ -783,7 +784,7 @@ static const struct io_op_def io_op_defs[] = {
 		.needs_async_data	= 1,
 		.async_size		= sizeof(struct io_async_rw),
 		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
-						IO_WQ_WORK_FSIZE,
+					  IO_WQ_WORK_FSIZE | IO_WQ_WORK_FILES,
 	},
 	[IORING_OP_FSYNC] = {
 		.needs_file		= 1,
@@ -794,7 +795,8 @@ static const struct io_op_def io_op_defs[] = {
 		.unbound_nonreg_file	= 1,
 		.pollin			= 1,
 		.async_size		= sizeof(struct io_async_rw),
-		.work_flags		= IO_WQ_WORK_BLKCG | IO_WQ_WORK_MM,
+		.work_flags		= IO_WQ_WORK_BLKCG | IO_WQ_WORK_MM |
+					  IO_WQ_WORK_FILES,
 	},
 	[IORING_OP_WRITE_FIXED] = {
 		.needs_file		= 1,
@@ -803,7 +805,7 @@ static const struct io_op_def io_op_defs[] = {
 		.pollout		= 1,
 		.async_size		= sizeof(struct io_async_rw),
 		.work_flags		= IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE |
-						IO_WQ_WORK_MM,
+					  IO_WQ_WORK_MM | IO_WQ_WORK_FILES,
 	},
 	[IORING_OP_POLL_ADD] = {
 		.needs_file		= 1,
@@ -857,7 +859,7 @@ static const struct io_op_def io_op_defs[] = {
 		.pollout		= 1,
 		.needs_async_data	= 1,
 		.async_size		= sizeof(struct io_async_connect),
-		.work_flags		= IO_WQ_WORK_MM,
+		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_FS,
 	},
 	[IORING_OP_FALLOCATE] = {
 		.needs_file		= 1,
@@ -885,7 +887,8 @@ static const struct io_op_def io_op_defs[] = {
 		.pollin			= 1,
 		.buffer_select		= 1,
 		.async_size		= sizeof(struct io_async_rw),
-		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG,
+		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
+					  IO_WQ_WORK_FILES,
 	},
 	[IORING_OP_WRITE] = {
 		.needs_file		= 1,
@@ -894,7 +897,7 @@ static const struct io_op_def io_op_defs[] = {
 		.pollout		= 1,
 		.async_size		= sizeof(struct io_async_rw),
 		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
-						IO_WQ_WORK_FSIZE,
+					  IO_WQ_WORK_FSIZE | IO_WQ_WORK_FILES,
 	},
 	[IORING_OP_FADVISE] = {
 		.needs_file		= 1,
@@ -907,14 +910,16 @@ static const struct io_op_def io_op_defs[] = {
 		.needs_file		= 1,
 		.unbound_nonreg_file	= 1,
 		.pollout		= 1,
-		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG,
+		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
+					  IO_WQ_WORK_FS,
 	},
 	[IORING_OP_RECV] = {
 		.needs_file		= 1,
 		.unbound_nonreg_file	= 1,
 		.pollin			= 1,
 		.buffer_select		= 1,
-		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG,
+		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
+					  IO_WQ_WORK_FS,
 	},
 	[IORING_OP_OPENAT2] = {
 		.work_flags		= IO_WQ_WORK_FILES | IO_WQ_WORK_FS |