drbd: Implemented the --assume-clean option for drbdsetup resize

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

3 files changed, 12 insertions, 3 deletions

diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 6f7933376a11..19b9a2851e7b 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -1479,6 +1479,7 @@ static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
         int retcode = NO_ERROR;
         int ldsc = 0; /* local disk size changed */
         enum determine_dev_size dd;
+        enum dds_flags ddsf;
 
         memset(&rs, 0, sizeof(struct resize));
         if (!resize_from_tags(mdev, nlp->tag_list, &rs)) {
@@ -1502,13 +1503,19 @@ static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
                 goto fail;
         }
 
+        if (rs.no_resync && mdev->agreed_pro_version < 93) {
+                retcode = ERR_NEED_APV_93;
+                goto fail;
+        }
+
         if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) {
                 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
                 ldsc = 1;
         }
 
         mdev->ldev->dc.disk_size = (sector_t)rs.resize_size;
-        dd = drbd_determin_dev_size(mdev, rs.resize_force ? DDSF_FORCED : 0);
+        ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
+        dd = drbd_determin_dev_size(mdev, ddsf);
         drbd_md_sync(mdev);
         put_ldev(mdev);
         if (dd == dev_size_error) {
@@ -1521,7 +1528,7 @@ static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
                         set_bit(RESIZE_PENDING, &mdev->flags);
 
                 drbd_send_uuids(mdev);
-                drbd_send_sizes(mdev, 1, 0);
+                drbd_send_sizes(mdev, 1, ddsf);
         }
 
  fail:
diff --git a/include/linux/drbd.h b/include/linux/drbd.h
index 4341b1a97a34..7944dd36ee3e 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 92
+#define PRO_VERSION_MAX 93
 
 
 enum drbd_io_error_p {
@@ -139,6 +139,7 @@ enum drbd_ret_codes {
         ERR_DATA_NOT_CURRENT    = 150,
         ERR_CONNECTED           = 151, /* DRBD 8.3 only */
         ERR_PERM                = 152,
+        ERR_NEED_APV_93         = 153,
 
         /* insert new ones above this line */
         AFTER_LAST_ERR_CODE
diff --git a/include/linux/drbd_nl.h b/include/linux/drbd_nl.h
index f7431a4ca608..de055c07c2ba 100644
--- a/include/linux/drbd_nl.h
+++ b/include/linux/drbd_nl.h
@@ -71,6 +71,7 @@ NL_PACKET(disconnect, 6, )
 NL_PACKET(resize, 7,
         NL_INT64(               29,     T_MAY_IGNORE,   resize_size)
         NL_BIT(                 68,     T_MAY_IGNORE,   resize_force)
+        NL_BIT(                 69,     T_MANDATORY,    no_resync)
 )
 
 NL_PACKET(syncer_conf, 8,