[PATCH 5.4 001/183] io_uring/unix: drop usage of io_uring socket

Sasha Levin
2024-03-24T23:46:41Z

From: Jens Axboe <axboe@kernel.dk>

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@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/io_uring.c | 18 +++++-------------
include/linux/fs.h | 6 +++---
net/core/scm.c | 2 +-
net/unix/scm.c | 4 +---
4 files changed, 10 insertions(+), 20 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 9de8961763b06..cd1858cc63206 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -381,19 +381,6 @@ 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 void io_ring_ctx_ref_free(struct percpu_ref *ref)
{
struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs);
@@ -3794,6 +3781,11 @@ static const struct file_operations io_uring_fops = {
.fasync = io_uring_fasync,
};

+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/include/linux/fs.h b/include/linux/fs.h
index e009b52ab6b0d..272f261894b17 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3614,11 +3614,11 @@ extern int generic_fadvise(struct file *file, loff_t offset, loff_t len,
int advice);

#if defined(CONFIG_IO_URING)
-extern struct sock *io_uring_get_socket(struct file *file);
+bool io_is_uring_fops(struct file *file);
#else
-static inline struct sock *io_uring_get_socket(struct file *file)
+static inline bool io_is_uring_fops(struct file *file)
{
- return NULL;
+ return false;
}
#endif

diff --git a/net/core/scm.c b/net/core/scm.c
index 5525c14f33f1e..a442bf63cd480 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 e881a6e78af53..51b623de3be5f 100644
--- a/net/unix/scm.c
+++ b/net/unix/scm.c
@@ -33,10 +33,8 @@ 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