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af_unix: Replace garbage collection algorithm.

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If we find a dead SCC during iteration, we call unix_collect_skb()
to splice all skb in the SCC to the global sk_buff_head, hitlist.

After iterating all SCC, we unlock unix_gc_lock and purge the queue.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Link: https://lore.kernel.org/r/20240325202425.60930-15-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Kuniyuki Iwashima
2024-03-25 13:24:24 -07:00
committed by Jakub Kicinski
parent a15702d8b3
commit 4090fa373f
3 changed files with 64 additions and 258 deletions
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8
include/net/af_unix.h
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@@ -19,9 +19,6 @@ static inline struct unix_sock *unix_get_socket(struct file *filp)
extern spinlock_t unix_gc_lock;
extern unsigned int unix_tot_inflight;
void unix_inflight(struct user_struct *user, struct file *fp);
void unix_notinflight(struct user_struct *user, struct file *fp);
void unix_add_edges(struct scm_fp_list *fpl, struct unix_sock *receiver);
void unix_del_edges(struct scm_fp_list *fpl);
void unix_update_edges(struct unix_sock *receiver);
@@ -85,12 +82,7 @@ struct unix_sock {
struct sock *peer;
struct sock *listener;
struct unix_vertex *vertex;
struct list_head link;
unsigned long inflight;
spinlock_t lock;
unsigned long gc_flags;
#define UNIX_GC_CANDIDATE 0
#define UNIX_GC_MAYBE_CYCLE 1
struct socket_wq peer_wq;
wait_queue_entry_t peer_wake;
struct scm_stat scm_stat;