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[IPVS]: Fix state variable on failure to start ipvs threads

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ip_vs currently fails to reset its ip_vs_sync_state variable if the
sync thread fails to start properly.  The result is that the kernel
will report a running daemon when their actuall is none.

If you issue the following commands:

1. ipvsadm --start-daemon master --mcast-interface bla
2. ipvsadm -L --daemon
3. ipvsadm --stop-daemon master

Assuming that bla is not an actual interface, step 2 should return no
data, but instead returns:

$ ipvsadm -L --daemon
master sync daemon (mcast=bla, syncid=0)

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Neil Horman 2007-06-18 22:33:20 -07:00 committed by David S. Miller
parent 281216177a
commit cc0191aeef
1 changed files with 39 additions and 2 deletions
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41
net/ipv4/ipvs/ip_vs_sync.c
View file

@ -67,6 +67,11 @@ struct ip_vs_sync_conn_options {
struct ip_vs_seq out_seq; /* outgoing seq. struct */
};
struct ip_vs_sync_thread_data {
struct completion *startup;
int state;
};
#define IP_VS_SYNC_CONN_TIMEOUT (3*60*HZ)
#define SIMPLE_CONN_SIZE (sizeof(struct ip_vs_sync_conn))
#define FULL_CONN_SIZE \
@ -751,6 +756,7 @@ static int sync_thread(void *startup)
mm_segment_t oldmm;
int state;
const char *name;
struct ip_vs_sync_thread_data *tinfo = startup;
/* increase the module use count */
ip_vs_use_count_inc();
@ -789,7 +795,14 @@ static int sync_thread(void *startup)
add_wait_queue(&sync_wait, &wait);
set_sync_pid(state, current->pid);
complete((struct completion *)startup);
complete(tinfo->startup);
/*
* once we call the completion queue above, we should
* null out that reference, since its allocated on the
* stack of the creating kernel thread
*/
tinfo->startup = NULL;
/* processing master/backup loop here */
if (state == IP_VS_STATE_MASTER)
@ -801,6 +814,14 @@ static int sync_thread(void *startup)
remove_wait_queue(&sync_wait, &wait);
/* thread exits */
/*
* If we weren't explicitly stopped, then we
* exited in error, and should undo our state
*/
if ((!stop_master_sync) && (!stop_backup_sync))
ip_vs_sync_state -= tinfo->state;
set_sync_pid(state, 0);
IP_VS_INFO("sync thread stopped!\n");
@ -812,6 +833,11 @@ static int sync_thread(void *startup)
set_stop_sync(state, 0);
wake_up(&stop_sync_wait);
/*
* we need to free the structure that was allocated
* for us in start_sync_thread
*/
kfree(tinfo);
return 0;
}
@ -838,11 +864,19 @@ int start_sync_thread(int state, char *mcast_ifn, __u8 syncid)
{
DECLARE_COMPLETION_ONSTACK(startup);
pid_t pid;
struct ip_vs_sync_thread_data *tinfo;
if ((state == IP_VS_STATE_MASTER && sync_master_pid) ||
(state == IP_VS_STATE_BACKUP && sync_backup_pid))
return -EEXIST;
/*
* Note that tinfo will be freed in sync_thread on exit
*/
tinfo = kmalloc(sizeof(struct ip_vs_sync_thread_data), GFP_KERNEL);
if (!tinfo)
return -ENOMEM;
IP_VS_DBG(7, "%s: pid %d\n", __FUNCTION__, current->pid);
IP_VS_DBG(7, "Each ip_vs_sync_conn entry need %Zd bytes\n",
sizeof(struct ip_vs_sync_conn));
@ -858,8 +892,11 @@ int start_sync_thread(int state, char *mcast_ifn, __u8 syncid)
ip_vs_backup_syncid = syncid;
}
tinfo->state = state;
tinfo->startup = &startup;
repeat:
if ((pid = kernel_thread(fork_sync_thread, &startup, 0)) < 0) {
if ((pid = kernel_thread(fork_sync_thread, tinfo, 0)) < 0) {
IP_VS_ERR("could not create fork_sync_thread due to %d... "
"retrying.\n", pid);
msleep_interruptible(1000);