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-rw-r--r--drivers/block/drbd/drbd_int.h8
-rw-r--r--drivers/block/drbd/drbd_main.c16
-rw-r--r--drivers/block/drbd/drbd_receiver.c22
-rw-r--r--include/linux/drbd.h2
-rw-r--r--include/linux/drbd_nl.h1
5 files changed, 43 insertions, 6 deletions
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 2bf3a6ef3684..1aae724e37fb 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -443,13 +443,18 @@ struct p_rs_param_89 {
char csums_alg[SHARED_SECRET_MAX];
} __packed;
+enum drbd_conn_flags {
+ CF_WANT_LOSE = 1,
+ CF_DRY_RUN = 2,
+};
+
struct p_protocol {
struct p_header head;
u32 protocol;
u32 after_sb_0p;
u32 after_sb_1p;
u32 after_sb_2p;
- u32 want_lose;
+ u32 conn_flags;
u32 two_primaries;
/* Since protocol version 87 and higher. */
@@ -791,6 +796,7 @@ enum {
* while this is set. */
RESIZE_PENDING, /* Size change detected locally, waiting for the response from
* the peer, if it changed there as well. */
+ CONN_DRY_RUN, /* Expect disconnect after resync handshake. */
};
struct drbd_bitmap; /* opaque for drbd_conf */
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index ab871e00ffc5..b2d347d18c7d 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -1668,7 +1668,7 @@ int drbd_send_sync_param(struct drbd_conf *mdev, struct syncer_conf *sc)
int drbd_send_protocol(struct drbd_conf *mdev)
{
struct p_protocol *p;
- int size, rv;
+ int size, cf, rv;
size = sizeof(struct p_protocol);
@@ -1685,9 +1685,21 @@ int drbd_send_protocol(struct drbd_conf *mdev)
p->after_sb_0p = cpu_to_be32(mdev->net_conf->after_sb_0p);
p->after_sb_1p = cpu_to_be32(mdev->net_conf->after_sb_1p);
p->after_sb_2p = cpu_to_be32(mdev->net_conf->after_sb_2p);
- p->want_lose = cpu_to_be32(mdev->net_conf->want_lose);
p->two_primaries = cpu_to_be32(mdev->net_conf->two_primaries);
+ cf = 0;
+ if (mdev->net_conf->want_lose)
+ cf |= CF_WANT_LOSE;
+ if (mdev->net_conf->dry_run) {
+ if (mdev->agreed_pro_version >= 92)
+ cf |= CF_DRY_RUN;
+ else {
+ dev_err(DEV, "--dry-run is not supported by peer");
+ return 0;
+ }
+ }
+ p->conn_flags = cpu_to_be32(cf);
+
if (mdev->agreed_pro_version >= 87)
strcpy(p->integrity_alg, mdev->net_conf->integrity_alg);
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index d065c646b35a..8bcde4a9632b 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -2538,6 +2538,16 @@ static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_rol
}
}
+ if (mdev->net_conf->dry_run || test_bit(CONN_DRY_RUN, &mdev->flags)) {
+ if (hg == 0)
+ dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n");
+ else
+ dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.",
+ drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET),
+ abs(hg) >= 2 ? "full" : "bit-map based");
+ return C_MASK;
+ }
+
if (abs(hg) >= 2) {
dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n");
if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake"))
@@ -2585,7 +2595,7 @@ static int receive_protocol(struct drbd_conf *mdev, struct p_header *h)
struct p_protocol *p = (struct p_protocol *)h;
int header_size, data_size;
int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p;
- int p_want_lose, p_two_primaries;
+ int p_want_lose, p_two_primaries, cf;
char p_integrity_alg[SHARED_SECRET_MAX] = "";
header_size = sizeof(*p) - sizeof(*h);
@@ -2598,8 +2608,14 @@ static int receive_protocol(struct drbd_conf *mdev, struct p_header *h)
p_after_sb_0p = be32_to_cpu(p->after_sb_0p);
p_after_sb_1p = be32_to_cpu(p->after_sb_1p);
p_after_sb_2p = be32_to_cpu(p->after_sb_2p);
- p_want_lose = be32_to_cpu(p->want_lose);
p_two_primaries = be32_to_cpu(p->two_primaries);
+ cf = be32_to_cpu(p->conn_flags);
+ p_want_lose = cf & CF_WANT_LOSE;
+
+ clear_bit(CONN_DRY_RUN, &mdev->flags);
+
+ if (cf & CF_DRY_RUN)
+ set_bit(CONN_DRY_RUN, &mdev->flags);
if (p_proto != mdev->net_conf->wire_protocol) {
dev_err(DEV, "incompatible communication protocols\n");
@@ -3125,6 +3141,8 @@ static int receive_state(struct drbd_conf *mdev, struct p_header *h)
dev_err(DEV, "Disk attach process on the peer node was aborted.\n");
peer_state.disk = D_DISKLESS;
} else {
+ if (test_and_clear_bit(CONN_DRY_RUN, &mdev->flags))
+ return FALSE;
D_ASSERT(oconn == C_WF_REPORT_PARAMS);
drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
return FALSE;
diff --git a/include/linux/drbd.h b/include/linux/drbd.h
index 78962272338a..4341b1a97a34 100644
--- a/include/linux/drbd.h
+++ b/include/linux/drbd.h
@@ -56,7 +56,7 @@ extern const char *drbd_buildtag(void);
#define REL_VERSION "8.3.7"
#define API_VERSION 88
#define PRO_VERSION_MIN 86
-#define PRO_VERSION_MAX 91
+#define PRO_VERSION_MAX 92
enum drbd_io_error_p {
diff --git a/include/linux/drbd_nl.h b/include/linux/drbd_nl.h
index a4d82f895994..b41050e8cc2f 100644
--- a/include/linux/drbd_nl.h
+++ b/include/linux/drbd_nl.h
@@ -63,6 +63,7 @@ NL_PACKET(net_conf, 5,
NL_BIT( 41, T_MAY_IGNORE, always_asbp)
NL_BIT( 61, T_MAY_IGNORE, no_cork)
NL_BIT( 62, T_MANDATORY, auto_sndbuf_size)
+ NL_BIT( 70, T_MANDATORY, dry_run)
)
NL_PACKET(disconnect, 6, )
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