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Message-ID: <20231123014747.66063-3-kuniyu@amazon.com>
Date: Wed, 22 Nov 2023 17:47:45 -0800
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
<pabeni@...hat.com>
CC: Ivan Babrou <ivan@...udflare.com>, Kuniyuki Iwashima <kuniyu@...zon.com>,
Kuniyuki Iwashima <kuni1840@...il.com>, <netdev@...r.kernel.org>
Subject: [PATCH v2 net-next 2/4] af_unix: Return struct unix_sock from unix_get_socket().
Currently, unix_get_socket() returns struct sock, but after calling
it, we always cast it to unix_sk().
Let's return struct unix_sock from unix_get_socket().
Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
---
include/linux/io_uring.h | 4 ++--
include/net/af_unix.h | 2 +-
io_uring/io_uring.c | 5 +++--
net/unix/garbage.c | 19 +++++++------------
net/unix/scm.c | 26 +++++++++++---------------
5 files changed, 24 insertions(+), 32 deletions(-)
diff --git a/include/linux/io_uring.h b/include/linux/io_uring.h
index aefb73eeeebf..be16677f0e4c 100644
--- a/include/linux/io_uring.h
+++ b/include/linux/io_uring.h
@@ -54,7 +54,7 @@ int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
struct iov_iter *iter, void *ioucmd);
void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret, ssize_t res2,
unsigned issue_flags);
-struct sock *io_uring_get_socket(struct file *file);
+struct unix_sock *io_uring_get_socket(struct file *file);
void __io_uring_cancel(bool cancel_all);
void __io_uring_free(struct task_struct *tsk);
void io_uring_unreg_ringfd(void);
@@ -111,7 +111,7 @@ static inline void io_uring_cmd_do_in_task_lazy(struct io_uring_cmd *ioucmd,
void (*task_work_cb)(struct io_uring_cmd *, unsigned))
{
}
-static inline struct sock *io_uring_get_socket(struct file *file)
+static inline struct unix_sock *io_uring_get_socket(struct file *file)
{
return NULL;
}
diff --git a/include/net/af_unix.h b/include/net/af_unix.h
index 5a8a670b1920..c628d30ceb19 100644
--- a/include/net/af_unix.h
+++ b/include/net/af_unix.h
@@ -14,7 +14,7 @@ void unix_destruct_scm(struct sk_buff *skb);
void io_uring_destruct_scm(struct sk_buff *skb);
void unix_gc(void);
void wait_for_unix_gc(void);
-struct sock *unix_get_socket(struct file *filp);
+struct unix_sock *unix_get_socket(struct file *filp);
struct sock *unix_peer_get(struct sock *sk);
#define UNIX_HASH_MOD (256 - 1)
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index ed254076c723..daed897f5975 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -177,13 +177,14 @@ static struct ctl_table kernel_io_uring_disabled_table[] = {
};
#endif
-struct sock *io_uring_get_socket(struct file *file)
+struct unix_sock *io_uring_get_socket(struct file *file)
{
#if defined(CONFIG_UNIX)
if (io_is_uring_fops(file)) {
struct io_ring_ctx *ctx = file->private_data;
- return ctx->ring_sock->sk;
+ if (ctx->ring_sock->sk)
+ return unix_sk(ctx->ring_sock->sk);
}
#endif
return NULL;
diff --git a/net/unix/garbage.c b/net/unix/garbage.c
index db1bb99bb793..4d634f5f6a55 100644
--- a/net/unix/garbage.c
+++ b/net/unix/garbage.c
@@ -105,20 +105,15 @@ static void scan_inflight(struct sock *x, void (*func)(struct unix_sock *),
while (nfd--) {
/* Get the socket the fd matches if it indeed does so */
- struct sock *sk = unix_get_socket(*fp++);
+ struct unix_sock *u = unix_get_socket(*fp++);
- if (sk) {
- struct unix_sock *u = unix_sk(sk);
+ /* Ignore non-candidates, they could have been added
+ * to the queues after starting the garbage collection
+ */
+ if (u && test_bit(UNIX_GC_CANDIDATE, &u->gc_flags)) {
+ hit = true;
- /* Ignore non-candidates, they could
- * have been added to the queues after
- * starting the garbage collection
- */
- if (test_bit(UNIX_GC_CANDIDATE, &u->gc_flags)) {
- hit = true;
-
- func(u);
- }
+ func(u);
}
}
if (hit && hitlist != NULL) {
diff --git a/net/unix/scm.c b/net/unix/scm.c
index 4b3979272a81..36ce8fed9acc 100644
--- a/net/unix/scm.c
+++ b/net/unix/scm.c
@@ -21,9 +21,8 @@ EXPORT_SYMBOL(gc_inflight_list);
DEFINE_SPINLOCK(unix_gc_lock);
EXPORT_SYMBOL(unix_gc_lock);
-struct sock *unix_get_socket(struct file *filp)
+struct unix_sock *unix_get_socket(struct file *filp)
{
- struct sock *u_sock = NULL;
struct inode *inode = file_inode(filp);
/* Socket ? */
@@ -34,12 +33,13 @@ struct sock *unix_get_socket(struct file *filp)
/* PF_UNIX ? */
if (s && ops && ops->family == PF_UNIX)
- u_sock = s;
- } else {
- /* Could be an io_uring instance */
- u_sock = io_uring_get_socket(filp);
+ return unix_sk(s);
+
+ return NULL;
}
- return u_sock;
+
+ /* Could be an io_uring instance */
+ return io_uring_get_socket(filp);
}
EXPORT_SYMBOL(unix_get_socket);
@@ -48,13 +48,11 @@ EXPORT_SYMBOL(unix_get_socket);
*/
void unix_inflight(struct user_struct *user, struct file *fp)
{
- struct sock *s = unix_get_socket(fp);
+ struct unix_sock *u = unix_get_socket(fp);
spin_lock(&unix_gc_lock);
- if (s) {
- struct unix_sock *u = unix_sk(s);
-
+ if (u) {
if (!u->inflight) {
BUG_ON(!list_empty(&u->link));
list_add_tail(&u->link, &gc_inflight_list);
@@ -71,13 +69,11 @@ void unix_inflight(struct user_struct *user, struct file *fp)
void unix_notinflight(struct user_struct *user, struct file *fp)
{
- struct sock *s = unix_get_socket(fp);
+ struct unix_sock *u = unix_get_socket(fp);
spin_lock(&unix_gc_lock);
- if (s) {
- struct unix_sock *u = unix_sk(s);
-
+ if (u) {
BUG_ON(!u->inflight);
BUG_ON(list_empty(&u->link));
--
2.30.2
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