[PATCH 116/117] drbd: implemented receiving of P_CONN_ST_CHG_REQ

[Philipp Reisner]

Signed-off-by: Philipp Reisner <philipp.reisner@xxxxxxxxxx>
Signed-off-by: Lars Ellenberg <lars.ellenberg@xxxxxxxxxx>
---
 drivers/block/drbd/drbd_int.h      |    1 +
 drivers/block/drbd/drbd_main.c     |   10 ++++++++++
 drivers/block/drbd/drbd_receiver.c |   10 ++++++++--
 drivers/block/drbd/drbd_state.h    |    1 +
 4 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 0cf5196..26ea665 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -1219,6 +1219,7 @@ extern int drbd_send_ov_request(struct drbd_conf *mdev,sector_t 
sector,int size)
 extern int drbd_send_bitmap(struct drbd_conf *mdev);
 extern int _drbd_send_bitmap(struct drbd_conf *mdev);
 extern int drbd_send_sr_reply(struct drbd_conf *mdev, enum drbd_state_rv retcode);
+extern int conn_send_sr_reply(struct drbd_tconn *tconn, enum drbd_state_rv retcode);
 extern void drbd_free_bc(struct drbd_backing_dev *ldev);
 extern void drbd_mdev_cleanup(struct drbd_conf *mdev);
 void drbd_print_uuids(struct drbd_conf *mdev, const char *text);
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index d8fd6dd..910dff7 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -990,6 +990,16 @@ int drbd_send_sr_reply(struct drbd_conf *mdev, enum drbd_state_rv 
retcode)
        return drbd_send_cmd(mdev, USE_META_SOCKET, P_STATE_CHG_REPLY, &p.head, sizeof(p));
 }
 
+int conn_send_sr_reply(struct drbd_tconn *tconn, enum drbd_state_rv retcode)
+{
+       struct p_req_state_reply p;
+       enum drbd_packet cmd = tconn->agreed_pro_version < 100 ? P_STATE_CHG_REPLY : 
P_CONN_ST_CHG_REPLY;
+
+       p.retcode    = cpu_to_be32(retcode);
+
+       return conn_send_cmd(tconn, 0, USE_META_SOCKET, cmd, &p.head, sizeof(p));
+}
+
 int fill_bitmap_rle_bits(struct drbd_conf *mdev,
        struct p_compressed_bm *p,
        struct bm_xfer_ctx *c)
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index bdd3f00..e346245 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -3235,9 +3235,14 @@ static int receive_req_state(struct drbd_conf *mdev, enum 
drbd_packet cmd,
        mask = convert_state(mask);
        val = convert_state(val);
 
-       rv = drbd_change_state(mdev, CS_VERBOSE, mask, val);
+       if (cmd == P_CONN_ST_CHG_REQ) {
+               rv = conn_request_state(mdev->tconn, mask, val, CS_VERBOSE | 
CS_LOCAL_ONLY);
+               conn_send_sr_reply(mdev->tconn, rv);
+       } else {
+               rv = drbd_change_state(mdev, CS_VERBOSE, mask, val);
+               drbd_send_sr_reply(mdev, rv);
+       }
 
-       drbd_send_sr_reply(mdev, rv);
        drbd_md_sync(mdev);
 
        return true;
@@ -3771,6 +3776,7 @@ static struct data_cmd drbd_cmd_handler[] = {
        [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest },
        [P_DELAY_PROBE]     = { 0, sizeof(struct p_delay_probe93), receive_skip },
        [P_OUT_OF_SYNC]     = { 0, sizeof(struct p_block_desc), receive_out_of_sync },
+       [P_CONN_ST_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state },
        /* anything missing from this table is in
         * the asender_tbl, see get_asender_cmd */
        [P_MAX_CMD]         = { 0, 0, NULL },
diff --git a/drivers/block/drbd/drbd_state.h b/drivers/block/drbd/drbd_state.h
index d312d84..5fdbdf0 100644
--- a/drivers/block/drbd/drbd_state.h
+++ b/drivers/block/drbd/drbd_state.h
@@ -63,6 +63,7 @@ enum chg_state_flags {
        CS_SERIALIZE    = 8,
        CS_ORDERED      = CS_WAIT_COMPLETE + CS_SERIALIZE,
        CS_NO_CSTATE_CHG = 16, /* Do not display changes in cstate. Internal to 
drbd_state.c */
+       CS_LOCAL_ONLY = 32, /* Do not consider a device pair wide state change */
 };
 
 extern enum drbd_state_rv drbd_change_state(struct drbd_conf *mdev,
-- 
1.7.4.1

-- 
: Dipl-Ing Philipp Reisner
: LINBIT | Your Way to High Availability
: Tel: +43-1-8178292-50, Fax: +43-1-8178292-82
: http://www.linbit.com

DRBD(R) and LINBIT(R) are registered trademarks of LINBIT, Austria.
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