1 files changed, 26 insertions, 44 deletions

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index be2d2da9cdba..7258c95e895e 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -1215,18 +1215,17 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
              ns.pdsk == D_OUTDATED)) {
                 if (get_ldev(mdev)) {
                         if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) &&
-                            mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE &&
-                            !atomic_read(&mdev->new_c_uuid))
-                                atomic_set(&mdev->new_c_uuid, 2);
+                            mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) {
+                                drbd_uuid_new_current(mdev);
+                                drbd_send_uuids(mdev);
+                        }
                         put_ldev(mdev);
                 }
         }
 
         if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) {
-                /* Diskless peer becomes primary or got connected do diskless, primary peer. */
-                if (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0 &&
-                    !atomic_read(&mdev->new_c_uuid))
-                        atomic_set(&mdev->new_c_uuid, 2);
+                if (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0)
+                        drbd_uuid_new_current(mdev);
 
                 /* D_DISKLESS Peer becomes secondary */
                 if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY)
@@ -1237,8 +1236,6 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
         /* Last part of the attaching process ... */
         if (ns.conn >= C_CONNECTED &&
             os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) {
-                kfree(mdev->p_uuid); /* We expect to receive up-to-date UUIDs soon. */
-                mdev->p_uuid = NULL; /* ...to not use the old ones in the mean time */
                 drbd_send_sizes(mdev, 0, 0);  /* to start sync... */
                 drbd_send_uuids(mdev);
                 drbd_send_state(mdev);
@@ -1350,24 +1347,6 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
         drbd_md_sync(mdev);
 }
 
-static int w_new_current_uuid(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
-{
-        if (get_ldev(mdev)) {
-                if (mdev->ldev->md.uuid[UI_BITMAP] == 0) {
-                        drbd_uuid_new_current(mdev);
-                        if (get_net_conf(mdev)) {
-                                drbd_send_uuids(mdev);
-                                put_net_conf(mdev);
-                        }
-                        drbd_md_sync(mdev);
-                }
-                put_ldev(mdev);
-        }
-        atomic_dec(&mdev->new_c_uuid);
-        wake_up(&mdev->misc_wait);
-
-        return 1;
-}
 
 static int drbd_thread_setup(void *arg)
 {
@@ -2291,9 +2270,9 @@ static int we_should_drop_the_connection(struct drbd_conf *mdev, struct socket *
  * with page_count == 0 or PageSlab.
  */
 static int _drbd_no_send_page(struct drbd_conf *mdev, struct page *page,
-                   int offset, size_t size)
+                   int offset, size_t size, unsigned msg_flags)
 {
-        int sent = drbd_send(mdev, mdev->data.socket, kmap(page) + offset, size, 0);
+        int sent = drbd_send(mdev, mdev->data.socket, kmap(page) + offset, size, msg_flags);
         kunmap(page);
         if (sent == size)
                 mdev->send_cnt += size>>9;
@@ -2301,7 +2280,7 @@ static int _drbd_no_send_page(struct drbd_conf *mdev, struct page *page,
 }
 
 static int _drbd_send_page(struct drbd_conf *mdev, struct page *page,
-                    int offset, size_t size)
+                    int offset, size_t size, unsigned msg_flags)
 {
         mm_segment_t oldfs = get_fs();
         int sent, ok;
@@ -2314,14 +2293,15 @@ static int _drbd_send_page(struct drbd_conf *mdev, struct page *page,
          * __page_cache_release a page that would actually still be referenced
          * by someone, leading to some obscure delayed Oops somewhere else. */
         if (disable_sendpage || (page_count(page) < 1) || PageSlab(page))
-                return _drbd_no_send_page(mdev, page, offset, size);
+                return _drbd_no_send_page(mdev, page, offset, size, msg_flags);
 
+        msg_flags |= MSG_NOSIGNAL;
         drbd_update_congested(mdev);
         set_fs(KERNEL_DS);
         do {
                 sent = mdev->data.socket->ops->sendpage(mdev->data.socket, page,
                                                         offset, len,
-                                                        MSG_NOSIGNAL);
+                                                        msg_flags);
                 if (sent == -EAGAIN) {
                         if (we_should_drop_the_connection(mdev,
                                                           mdev->data.socket))
@@ -2350,9 +2330,11 @@ static int _drbd_send_bio(struct drbd_conf *mdev, struct bio *bio)
 {
         struct bio_vec *bvec;
         int i;
+        /* hint all but last page with MSG_MORE */
         __bio_for_each_segment(bvec, bio, i, 0) {
                 if (!_drbd_no_send_page(mdev, bvec->bv_page,
-                                     bvec->bv_offset, bvec->bv_len))
+                                     bvec->bv_offset, bvec->bv_len,
+                                     i == bio->bi_vcnt -1 ? 0 : MSG_MORE))
                         return 0;
         }
         return 1;
@@ -2362,12 +2344,13 @@ static int _drbd_send_zc_bio(struct drbd_conf *mdev, struct bio *bio)
 {
         struct bio_vec *bvec;
         int i;
+        /* hint all but last page with MSG_MORE */
         __bio_for_each_segment(bvec, bio, i, 0) {
                 if (!_drbd_send_page(mdev, bvec->bv_page,
-                                     bvec->bv_offset, bvec->bv_len))
+                                     bvec->bv_offset, bvec->bv_len,
+                                     i == bio->bi_vcnt -1 ? 0 : MSG_MORE))
                         return 0;
         }
-
         return 1;
 }
 
@@ -2375,9 +2358,11 @@ static int _drbd_send_zc_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e)
 {
         struct page *page = e->pages;
         unsigned len = e->size;
+        /* hint all but last page with MSG_MORE */
         page_chain_for_each(page) {
                 unsigned l = min_t(unsigned, len, PAGE_SIZE);
-                if (!_drbd_send_page(mdev, page, 0, l))
+                if (!_drbd_send_page(mdev, page, 0, l,
+                                page_chain_next(page) ? MSG_MORE : 0))
                         return 0;
                 len -= l;
         }
@@ -2457,11 +2442,11 @@ int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req)
         p.dp_flags = cpu_to_be32(dp_flags);
         set_bit(UNPLUG_REMOTE, &mdev->flags);
         ok = (sizeof(p) ==
-                drbd_send(mdev, mdev->data.socket, &p, sizeof(p), MSG_MORE));
+                drbd_send(mdev, mdev->data.socket, &p, sizeof(p), dgs ? MSG_MORE : 0));
         if (ok && dgs) {
                 dgb = mdev->int_dig_out;
                 drbd_csum_bio(mdev, mdev->integrity_w_tfm, req->master_bio, dgb);
-                ok = drbd_send(mdev, mdev->data.socket, dgb, dgs, MSG_MORE);
+                ok = drbd_send(mdev, mdev->data.socket, dgb, dgs, 0);
         }
         if (ok) {
                 if (mdev->net_conf->wire_protocol == DRBD_PROT_A)
@@ -2510,11 +2495,11 @@ int drbd_send_block(struct drbd_conf *mdev, enum drbd_packets cmd,
                 return 0;
 
         ok = sizeof(p) == drbd_send(mdev, mdev->data.socket, &p,
-                                        sizeof(p), MSG_MORE);
+                                        sizeof(p), dgs ? MSG_MORE : 0);
         if (ok && dgs) {
                 dgb = mdev->int_dig_out;
                 drbd_csum_ee(mdev, mdev->integrity_w_tfm, e, dgb);
-                ok = drbd_send(mdev, mdev->data.socket, dgb, dgs, MSG_MORE);
+                ok = drbd_send(mdev, mdev->data.socket, dgb, dgs, 0);
         }
         if (ok)
                 ok = _drbd_send_zc_ee(mdev, e);
@@ -2708,7 +2693,6 @@ void drbd_init_set_defaults(struct drbd_conf *mdev)
         atomic_set(&mdev->net_cnt, 0);
         atomic_set(&mdev->packet_seq, 0);
         atomic_set(&mdev->pp_in_use, 0);
-        atomic_set(&mdev->new_c_uuid, 0);
 
         mutex_init(&mdev->md_io_mutex);
         mutex_init(&mdev->data.mutex);
@@ -2739,14 +2723,12 @@ void drbd_init_set_defaults(struct drbd_conf *mdev)
         INIT_LIST_HEAD(&mdev->bm_io_work.w.list);
         INIT_LIST_HEAD(&mdev->delay_probes);
         INIT_LIST_HEAD(&mdev->delay_probe_work.list);
-        INIT_LIST_HEAD(&mdev->uuid_work.list);
 
         mdev->resync_work.cb  = w_resync_inactive;
         mdev->unplug_work.cb  = w_send_write_hint;
         mdev->md_sync_work.cb = w_md_sync;
         mdev->bm_io_work.w.cb = w_bitmap_io;
         mdev->delay_probe_work.cb = w_delay_probes;
-        mdev->uuid_work.cb = w_new_current_uuid;
         init_timer(&mdev->resync_timer);
         init_timer(&mdev->md_sync_timer);
         init_timer(&mdev->delay_probe_timer);
@@ -3799,7 +3781,7 @@ _drbd_insert_fault(struct drbd_conf *mdev, unsigned int type)
         if (ret) {
                 fault_count++;
 
-                if (printk_ratelimit())
+                if (__ratelimit(&drbd_ratelimit_state))
                         dev_warn(DEV, "***Simulating %s failure\n",
                                 _drbd_fault_str(type));
         }