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libceph: fix socket read error handling 

If we get EAGAIN when trying to read from the socket, it is not an error.
Return 0 from the helper in this case to simplify the error handling cases
in the caller (indirectly, try_read).

Fix try_read to pass any error to it's caller (con_work) instead of almost
always returning 0.  This let's us respond to things like socket
disconnects.

Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2011-01-25 08:17:48 -08:00
parent d66bbd441c
commit 98bdb0aa00
1 changed files with 19 additions and 20 deletions
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39
net/ceph/messenger.c
View File

@ -252,8 +252,12 @@ static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
{
struct kvec iov = {buf, len};
struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
int r;
return kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
if (r == -EAGAIN)
r = 0;
return r;
}
/*
@ -1821,19 +1825,17 @@ more:
dout("try_read connecting\n");
ret = read_partial_banner(con);
if (ret <= 0)
goto done;
if (process_banner(con) < 0) {
ret = -1;
goto out;
}
ret = process_banner(con);
if (ret < 0)
goto out;
}
ret = read_partial_connect(con);
if (ret <= 0)
goto done;
if (process_connect(con) < 0) {
ret = -1;
goto out;
}
ret = process_connect(con);
if (ret < 0)
goto out;
goto more;
}
@ -1848,7 +1850,7 @@ more:
dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
ret = ceph_tcp_recvmsg(con->sock, buf, skip);
if (ret <= 0)
goto done;
goto out;
con->in_base_pos += ret;
if (con->in_base_pos)
goto more;
@ -1859,7 +1861,7 @@ more:
*/
ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
if (ret <= 0)
goto done;
goto out;
dout("try_read got tag %d\n", (int)con->in_tag);
switch (con->in_tag) {
case CEPH_MSGR_TAG_MSG:
@ -1870,7 +1872,7 @@ more:
break;
case CEPH_MSGR_TAG_CLOSE:
set_bit(CLOSED, &con->state); /* fixme */
goto done;
goto out;
default:
goto bad_tag;
}
@ -1882,13 +1884,12 @@ more:
case -EBADMSG:
con->error_msg = "bad crc";
ret = -EIO;
goto out;
break;
case -EIO:
con->error_msg = "io error";
goto out;
default:
goto done;
break;
}
goto out;
}
if (con->in_tag == CEPH_MSGR_TAG_READY)
goto more;
@ -1898,15 +1899,13 @@ more:
if (con->in_tag == CEPH_MSGR_TAG_ACK) {
ret = read_partial_ack(con);
if (ret <= 0)
goto done;
goto out;
process_ack(con);
goto more;
}
done:
ret = 0;
out:
dout("try_read done on %p\n", con);
dout("try_read done on %p ret %d\n", con, ret);
return ret;
bad_tag: