[PATCH 1/8] af_unix: take address assignment/hash insertion into a new helper
From: Al Viro <viro@zeniv.linux.org.uk>
Date: 2021-02-19 04:20:58
Also in:
lkml
Subsystem:
networking [general], networking [unix sockets], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Kuniyuki Iwashima, Linus Torvalds
Duplicated logics in all bind variants (autobind, bind-to-path, bind-to-abstract) gets taken into a common helper. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> --- net/unix/af_unix.c | 30 +++++++++++++++--------------- 1 file changed, 15 insertions(+), 15 deletions(-)
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 41c3303c3357..179b4fe837e6 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c@@ -262,6 +262,16 @@ static void __unix_insert_socket(struct hlist_head *list, struct sock *sk) sk_add_node(sk, list); } +static void __unix_set_addr(struct sock *sk, struct unix_address *addr, + unsigned hash) + __releases(&unix_table_lock) +{ + __unix_remove_socket(sk); + smp_store_release(&unix_sk(sk)->addr, addr); + __unix_insert_socket(&unix_socket_table[hash], sk); + spin_unlock(&unix_table_lock); +} + static inline void unix_remove_socket(struct sock *sk) { spin_lock(&unix_table_lock);
@@ -912,10 +922,7 @@ static int unix_autobind(struct socket *sock) } addr->hash ^= sk->sk_type; - __unix_remove_socket(sk); - smp_store_release(&u->addr, addr); - __unix_insert_socket(&unix_socket_table[addr->hash], sk); - spin_unlock(&unix_table_lock); + __unix_set_addr(sk, addr, addr->hash); err = 0; out: mutex_unlock(&u->bindlock);
@@ -1016,7 +1023,6 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) int err; unsigned int hash; struct unix_address *addr; - struct hlist_head *list; struct path path = { }; err = -EINVAL;
@@ -1068,26 +1074,20 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) hash = d_backing_inode(path.dentry)->i_ino & (UNIX_HASH_SIZE - 1); spin_lock(&unix_table_lock); u->path = path; - list = &unix_socket_table[hash]; } else { spin_lock(&unix_table_lock); err = -EADDRINUSE; if (__unix_find_socket_byname(net, sunaddr, addr_len, sk->sk_type, hash)) { + spin_unlock(&unix_table_lock); unix_release_addr(addr); - goto out_unlock; + goto out_up; } - - list = &unix_socket_table[addr->hash]; + hash = addr->hash; } + __unix_set_addr(sk, addr, hash); err = 0; - __unix_remove_socket(sk); - smp_store_release(&u->addr, addr); - __unix_insert_socket(list, sk); - -out_unlock: - spin_unlock(&unix_table_lock); out_up: mutex_unlock(&u->bindlock); out_put:
--
2.11.0