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sk: Restore sockets bufs via usernsd

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Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Andrew Vagin <avagin@parallels.com>
This commit is contained in:
Pavel Emelyanov 2015-02-13 16:09:50 +04:00
parent b8556e8084
commit b63b361c1a
1 changed files with 16 additions and 9 deletions
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25
sockets.c
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@ -374,6 +374,18 @@ int do_restore_opt(int sk, int level, int name, void *val, int len)
return 0;
}
static int sk_setbufs(void *arg, int fd)
{
u32 *buf = (u32 *)arg;
if (restore_opt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &buf[0]))
return -1;
if (restore_opt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &buf[1]))
return -1;
return 0;
}
/*
* Set sizes of buffers to maximum and prevent blocking
* Caller of this fn should call other socket restoring
@ -383,13 +395,10 @@ int do_restore_opt(int sk, int level, int name, void *val, int len)
int restore_prepare_socket(int sk)
{
int flags;
/* In kernel a bufsize has type int and a value is doubled. */
u32 maxbuf = INT_MAX / 2;
u32 maxbuf[2] = { INT_MAX / 2, INT_MAX / 2 };
if (restore_opt(sk, SOL_SOCKET, SO_SNDBUFFORCE, &maxbuf))
return -1;
if (restore_opt(sk, SOL_SOCKET, SO_RCVBUFFORCE, &maxbuf))
if (userns_call(sk_setbufs, 0, maxbuf, sizeof(maxbuf), sk))
return -1;
/* Prevent blocking on restore */
@ -410,14 +419,12 @@ int restore_socket_opts(int sk, SkOptsEntry *soe)
{
int ret = 0, val;
struct timeval tv;
u32 bufs[2] = { soe->so_sndbuf, soe->so_rcvbuf };
pr_info("%d restore sndbuf %d rcv buf %d\n", sk, soe->so_sndbuf, soe->so_rcvbuf);
/* setsockopt() multiplies the input values by 2 */
val = soe->so_sndbuf / 2;
ret |= restore_opt(sk, SOL_SOCKET, SO_SNDBUFFORCE, &val);
val = soe->so_rcvbuf / 2;
ret |= restore_opt(sk, SOL_SOCKET, SO_RCVBUFFORCE, &val);
ret |= userns_call(sk_setbufs, UNS_ASYNC, bufs, sizeof(bufs), sk);
if (soe->has_so_priority) {
pr_debug("\trestore priority %d for socket\n", soe->so_priority);