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drbd: Introduce new primitives for sending commands

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Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Andreas Gruenbacher 2011-03-29 16:55:40 +02:00 committed by Philipp Reisner
parent a17647aae4
commit dba5858750
2 changed files with 73 additions and 0 deletions
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9
drivers/block/drbd/drbd_int.h
View file

@ -1903,6 +1903,15 @@ static inline int drbd_send_short_cmd(struct drbd_conf *mdev,
return drbd_send_cmd(mdev, &mdev->tconn->data, cmd, &h, sizeof(h));
}
extern void *conn_prepare_command(struct drbd_tconn *, struct drbd_socket *);
extern void *drbd_prepare_command(struct drbd_conf *, struct drbd_socket *);
extern int conn_send_command(struct drbd_tconn *, struct drbd_socket *,
enum drbd_packet, unsigned int, void *,
unsigned int);
extern int drbd_send_command(struct drbd_conf *, struct drbd_socket *,
enum drbd_packet, unsigned int, void *,
unsigned int);
extern int drbd_send_ping(struct drbd_tconn *tconn);
extern int drbd_send_ping_ack(struct drbd_tconn *tconn);

64
drivers/block/drbd/drbd_main.c
View file

@ -765,6 +765,70 @@ int conn_send_cmd2(struct drbd_tconn *tconn, enum drbd_packet cmd, char *data,
return err;
}
void *conn_prepare_command(struct drbd_tconn *tconn, struct drbd_socket *sock)
{
mutex_lock(&sock->mutex);
if (!sock->socket) {
mutex_unlock(&sock->mutex);
return NULL;
}
return sock->sbuf;
}
void *drbd_prepare_command(struct drbd_conf *mdev, struct drbd_socket *sock)
{
return conn_prepare_command(mdev->tconn, sock);
}
static int __send_command(struct drbd_tconn *tconn, int vnr,
struct drbd_socket *sock, enum drbd_packet cmd,
unsigned int header_size, void *data,
unsigned int size)
{
int msg_flags;
int err;
/*
* Called with @data == NULL and the size of the data blocks in @size
* for commands that send data blocks. For those commands, omit the
* MSG_MORE flag: this will increase the likelihood that data blocks
* which are page aligned on the sender will end up page aligned on the
* receiver.
*/
msg_flags = data ? MSG_MORE : 0;
_prepare_header(tconn, vnr, sock->sbuf, cmd,
header_size - sizeof(struct p_header) + size);
err = drbd_send_all(tconn, sock->socket, sock->sbuf, header_size,
msg_flags);
if (data && !err)
err = drbd_send_all(tconn, sock->socket, data, size, 0);
return err;
}
int conn_send_command(struct drbd_tconn *tconn, struct drbd_socket *sock,
enum drbd_packet cmd, unsigned int header_size,
void *data, unsigned int size)
{
int err;
err = __send_command(tconn, 0, sock, cmd, header_size, data, size);
mutex_unlock(&sock->mutex);
return err;
}
int drbd_send_command(struct drbd_conf *mdev, struct drbd_socket *sock,
enum drbd_packet cmd, unsigned int header_size,
void *data, unsigned int size)
{
int err;
err = __send_command(mdev->tconn, mdev->vnr, sock, cmd, header_size,
data, size);
mutex_unlock(&sock->mutex);
return err;
}
int drbd_send_ping(struct drbd_tconn *tconn)
{
struct p_header h;