提交 52b061a4 编写于 作者: A Andreas Gruenbacher 提交者: Philipp Reisner

drbd: Introduce drbd_header_size()

Signed-off-by: NPhilipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: NLars Ellenberg <lars.ellenberg@linbit.com>
上级 dba58587
......@@ -315,6 +315,8 @@ struct p_header {
u8 payload[0];
};
extern unsigned int drbd_header_size(struct drbd_tconn *tconn);
/*
* short commands, packets without payload, plain p_header:
* P_PING
......
......@@ -689,6 +689,20 @@ void drbd_thread_current_set_cpu(struct drbd_thread *thi)
}
#endif
/**
* drbd_header_size - size of a packet header
*
* The header size is a multiple of 8, so any payload following the header is
* word aligned on 64-bit architectures. (The bitmap send and receive code
* relies on this.)
*/
unsigned int drbd_header_size(struct drbd_tconn *tconn)
{
BUILD_BUG_ON(sizeof(struct p_header80) != sizeof(struct p_header95));
BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header80), 8));
return sizeof(struct p_header80);
}
static void prepare_header80(struct p_header80 *h, enum drbd_packet cmd, int size)
{
h->magic = cpu_to_be32(DRBD_MAGIC);
......
......@@ -995,7 +995,7 @@ static int drbd_recv_header(struct drbd_tconn *tconn, struct packet_info *pi)
struct p_header *h = tconn->data.rbuf;
int err;
err = drbd_recv_all_warn(tconn, h, sizeof(*h));
err = drbd_recv_all_warn(tconn, h, drbd_header_size(tconn));
if (err)
return err;
......@@ -4842,7 +4842,8 @@ int drbd_asender(struct drbd_thread *thi)
int rv;
void *buf = h;
int received = 0;
int expect = sizeof(struct p_header);
unsigned int header_size = drbd_header_size(tconn);
int expect = header_size;
int ping_timeout_active = 0;
current->policy = SCHED_RR; /* Make this a realtime task! */
......@@ -4926,7 +4927,7 @@ int drbd_asender(struct drbd_thread *thi)
goto disconnect;
}
expect = cmd->pkt_size;
if (pi.size != expect - sizeof(struct p_header)) {
if (pi.size != expect - header_size) {
conn_err(tconn, "Wrong packet size on meta (c: %d, l: %d)\n",
pi.cmd, pi.size);
goto reconnect;
......@@ -4950,7 +4951,7 @@ int drbd_asender(struct drbd_thread *thi)
buf = h;
received = 0;
expect = sizeof(struct p_header);
expect = header_size;
cmd = NULL;
}
}
......
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