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libceph: socket can close in any connection state

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A connection's socket can close for any reason, independent of the
state of the connection (and without irrespective of the connection
mutex).  As a result, the connectino can be in pretty much any state
at the time its socket is closed.

Handle those other cases at the top of con_work().  Pull this whole
block of code into a separate function to reduce the clutter.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
This commit is contained in:
Alex Elder 2012-12-07 19:50:07 -06:00
parent b8f5c6edca
commit 7bb21d68c5
1 changed files with 30 additions and 17 deletions
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47
net/ceph/messenger.c
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@ -2273,6 +2273,35 @@ static void queue_con(struct ceph_connection *con)
(void) queue_con_delay(con, 0);
}
static bool con_sock_closed(struct ceph_connection *con)
{
if (!test_and_clear_bit(CON_FLAG_SOCK_CLOSED, &con->flags))
return false;
#define CASE(x) \
case CON_STATE_ ## x: \
con->error_msg = "socket closed (con state " #x ")"; \
break;
switch (con->state) {
CASE(CLOSED);
CASE(PREOPEN);
CASE(CONNECTING);
CASE(NEGOTIATING);
CASE(OPEN);
CASE(STANDBY);
default:
pr_warning("%s con %p unrecognized state %lu\n",
__func__, con, con->state);
con->error_msg = "unrecognized con state";
BUG();
break;
}
#undef CASE
return true;
}
/*
* Do some work on a connection. Drop a connection ref when we're done.
*/
@ -2284,24 +2313,8 @@ static void con_work(struct work_struct *work)
mutex_lock(&con->mutex);
restart:
if (test_and_clear_bit(CON_FLAG_SOCK_CLOSED, &con->flags)) {
switch (con->state) {
case CON_STATE_CONNECTING:
con->error_msg = "connection failed";
break;
case CON_STATE_NEGOTIATING:
con->error_msg = "negotiation failed";
break;
case CON_STATE_OPEN:
con->error_msg = "socket closed";
break;
default:
dout("unrecognized con state %d\n", (int)con->state);
con->error_msg = "unrecognized con state";
BUG();
}
if (con_sock_closed(con))
goto fault;
}
if (test_and_clear_bit(CON_FLAG_BACKOFF, &con->flags)) {
dout("con_work %p backing off\n", con);