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sunrpc: Adjust size of socket's receive page array dynamically

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As a step towards making NFSD's maximum rsize and wsize variable at
run-time, make sk_pages a flexible array.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever
2025-05-15 16:16:25 -04:00
parent 1259560b98
commit f4126823c1
2 changed files with 9 additions and 3 deletions
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include/linux/sunrpc/svcsock.h
+3 -1
View File
@@ -40,7 +40,9 @@ struct svc_sock {
struct completion sk_handshake_done;
struct page * sk_pages[RPCSVC_MAXPAGES]; /* received data */
/* received data */
unsigned long sk_maxpages;
struct page * sk_pages[] __counted_by(sk_maxpages);
};
static inline u32 svc_sock_reclen(struct svc_sock *svsk)
net/sunrpc/svcsock.c
+6 -2
View File
@@ -1339,7 +1339,8 @@ static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
svsk->sk_marker = xdr_zero;
svsk->sk_tcplen = 0;
svsk->sk_datalen = 0;
memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
memset(&svsk->sk_pages[0], 0,
svsk->sk_maxpages * sizeof(struct page *));
tcp_sock_set_nodelay(sk);
@@ -1378,10 +1379,13 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
struct svc_sock *svsk;
struct sock *inet;
int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
unsigned long pages;
svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
pages = svc_serv_maxpages(serv);
svsk = kzalloc(struct_size(svsk, sk_pages, pages), GFP_KERNEL);
if (!svsk)
return ERR_PTR(-ENOMEM);
svsk->sk_maxpages = pages;
inet = sock->sk;