io_uring/rsrc: rename and export IO_IMU_DEST / IO_IMU_SOURCE

Rename IO_IMU_DEST and IO_IMU_SOURCE to IO_BUF_DEST and IO_BUF_SOURCE
and export it so subsystems may use it.

This is needed by the io_buffer_register_bvec() path for callers who may
need the buffer to be both readable and writable.

Signed-off-by: Joanne Koong <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: joannekoong

include/linux/io_uring_types.h

@@ -44,6 +44,11 @@ enum io_uring_cmd_flags {
 	IO_URING_F_COMPAT		= (1 << 12),
 };
 
+enum {
+	IO_BUF_DEST	= 1 << ITER_DEST,
+	IO_BUF_SOURCE	= 1 << ITER_SOURCE,
+};
+
 struct iou_loop_params;
 
 struct io_wq_work_node {

io_uring/io_uring.c

@@ -3215,7 +3215,7 @@ static int __init io_uring_init(void)
 	io_uring_optable_init();
 
 	/* imu->dir is u8 */
-	BUILD_BUG_ON((IO_IMU_DEST | IO_IMU_SOURCE) > U8_MAX);
+	BUILD_BUG_ON((IO_BUF_DEST | IO_BUF_SOURCE) > U8_MAX);
 
 	/*
 	 * Allow user copy in the per-command field, which starts after the

io_uring/rsrc.c

@@ -820,7 +820,7 @@ static struct io_rsrc_node *io_sqe_buffer_register(struct io_ring_ctx *ctx,
 	imu->release = io_release_ubuf;
 	imu->priv = imu;
 	imu->flags = 0;
-	imu->dir = IO_IMU_DEST | IO_IMU_SOURCE;
+	imu->dir = IO_BUF_DEST | IO_BUF_SOURCE;
 	if (coalesced)
 		imu->folio_shift = data.folio_shift;
 	refcount_set(&imu->refs, 1);

io_uring/rsrc.h

@@ -23,11 +23,6 @@ struct io_rsrc_node {
 	};
 };
 
-enum {
-	IO_IMU_DEST	= 1 << ITER_DEST,
-	IO_IMU_SOURCE	= 1 << ITER_SOURCE,
-};
-
 enum {
 	IO_REGBUF_F_KBUF		= 1,
 };