[PATCH 5.15 001/317] io_uring/unix: drop usage of io_uring socket

From: Sasha Levin
Date: Mon Mar 25 2024 - 04:26:42 EST


From: Jens Axboe <axboe@xxxxxxxxx>

Commit a4104821ad651d8a0b374f0b2474c345bbb42f82 upstream.

Since we no longer allow sending io_uring fds over SCM_RIGHTS, move to
using io_is_uring_fops() to detect whether this is a io_uring fd or not.
With that done, kill off io_uring_get_socket() as nobody calls it
anymore.

This is in preparation to yanking out the rest of the core related to
unix gc with io_uring.

Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
include/linux/io_uring.h | 10 +++++-----
io_uring/io_uring.c | 18 +++++-------------
net/core/scm.c | 2 +-
net/unix/scm.c | 4 +---
4 files changed, 12 insertions(+), 22 deletions(-)

diff --git a/include/linux/io_uring.h b/include/linux/io_uring.h
index 649a4d7c241bc..55d09f594cd14 100644
--- a/include/linux/io_uring.h
+++ b/include/linux/io_uring.h
@@ -6,9 +6,9 @@
#include <linux/xarray.h>

#if defined(CONFIG_IO_URING)
-struct sock *io_uring_get_socket(struct file *file);
void __io_uring_cancel(bool cancel_all);
void __io_uring_free(struct task_struct *tsk);
+bool io_is_uring_fops(struct file *file);

static inline void io_uring_files_cancel(void)
{
@@ -26,10 +26,6 @@ static inline void io_uring_free(struct task_struct *tsk)
__io_uring_free(tsk);
}
#else
-static inline struct sock *io_uring_get_socket(struct file *file)
-{
- return NULL;
-}
static inline void io_uring_task_cancel(void)
{
}
@@ -39,6 +35,10 @@ static inline void io_uring_files_cancel(void)
static inline void io_uring_free(struct task_struct *tsk)
{
}
+static inline bool io_is_uring_fops(struct file *file)
+{
+ return false;
+}
#endif

#endif
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 55fd6d98fe121..541e6a6985ecc 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -1116,19 +1116,6 @@ static struct kmem_cache *req_cachep;

static const struct file_operations io_uring_fops;

-struct sock *io_uring_get_socket(struct file *file)
-{
-#if defined(CONFIG_UNIX)
- if (file->f_op == &io_uring_fops) {
- struct io_ring_ctx *ctx = file->private_data;
-
- return ctx->ring_sock->sk;
- }
-#endif
- return NULL;
-}
-EXPORT_SYMBOL(io_uring_get_socket);
-
static inline void io_tw_lock(struct io_ring_ctx *ctx, bool *locked)
{
if (!*locked) {
@@ -10445,6 +10432,11 @@ static const struct file_operations io_uring_fops = {
#endif
};

+bool io_is_uring_fops(struct file *file)
+{
+ return file->f_op == &io_uring_fops;
+}
+
static int io_allocate_scq_urings(struct io_ring_ctx *ctx,
struct io_uring_params *p)
{
diff --git a/net/core/scm.c b/net/core/scm.c
index e762a4b8a1d22..a877c4ef4c256 100644
--- a/net/core/scm.c
+++ b/net/core/scm.c
@@ -105,7 +105,7 @@ static int scm_fp_copy(struct cmsghdr *cmsg, struct scm_fp_list **fplp)
if (fd < 0 || !(file = fget_raw(fd)))
return -EBADF;
/* don't allow io_uring files */
- if (io_uring_get_socket(file)) {
+ if (io_is_uring_fops(file)) {
fput(file);
return -EINVAL;
}
diff --git a/net/unix/scm.c b/net/unix/scm.c
index e8e2a00bb0f58..d1048b4c2baaf 100644
--- a/net/unix/scm.c
+++ b/net/unix/scm.c
@@ -34,10 +34,8 @@ struct sock *unix_get_socket(struct file *filp)
/* PF_UNIX ? */
if (s && sock->ops && sock->ops->family == PF_UNIX)
u_sock = s;
- } else {
- /* Could be an io_uring instance */
- u_sock = io_uring_get_socket(filp);
}
+
return u_sock;
}
EXPORT_SYMBOL(unix_get_socket);
--
2.43.0