[PATCHv2 2/6] io_uring: create resource release callback

Keith Busch
2025-02-11T00:57:20Z

From: Keith Busch <kbusch@kernel.org>

When a registered resource is about to be freed, check if it has
registered a release function, and call it if so. This is preparing for
resources that are related to an external component.

Signed-off-by: Keith Busch <kbusch@kernel.org>
---
io_uring/rsrc.c | 2 ++
io_uring/rsrc.h | 3 +++
2 files changed, 5 insertions(+)

diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c
index 4d0e1c06c8bc6..30f08cf13ef60 100644
--- a/io_uring/rsrc.c
+++ b/io_uring/rsrc.c
@@ -455,6 +455,8 @@ void io_free_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node)
case IORING_RSRC_BUFFER:
if (node->buf)
io_buffer_unmap(ctx, node);
+ if (node->release)
+ node->release(node->priv);
break;
default:
WARN_ON_ONCE(1);
diff --git a/io_uring/rsrc.h b/io_uring/rsrc.h
index abd0d5d42c3e1..a3826ab84e666 100644
--- a/io_uring/rsrc.h
+++ b/io_uring/rsrc.h
@@ -24,6 +24,9 @@ struct io_rsrc_node {
unsigned long file_ptr;
struct io_mapped_ubuf *buf;
};
+
+ void (*release)(void *);
+ void *priv;
};

struct io_mapped_ubuf {
--
2.43.5