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From 6f48ea5b06bd3f566d51996f447c205452c6ee70 Mon Sep 17 00:00:00 2001
From: John Snow <jsnow@redhat.com>
Date: Fri, 22 Mar 2019 03:22:21 +0100
Subject: [PATCH 054/163] nbd/server: send more than one extent of
 base:allocation context

RH-Author: John Snow <jsnow@redhat.com>
Message-id: <20190322032241.8111-9-jsnow@redhat.com>
Patchwork-id: 85100
O-Subject: [RHEL-7.7 qemu-kvm-rhev PATCH 08/28] nbd/server: send more than one extent of base:allocation context
Bugzilla: 1691563
RH-Acked-by: Max Reitz <mreitz@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>

From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

This is necessary for efficient block-status export, for clients which
support it.  (qemu is not yet such a client, but could become one.)

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20180704112302.471456-3-vsementsov@virtuozzo.com>
[eblake: grammar tweaks]
Signed-off-by: Eric Blake <eblake@redhat.com>
(cherry picked from commit fb7afc797e071f2616e1ccc849b39fe43e7033bf)
Signed-off-by: John Snow <jsnow@redhat.com>

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 nbd/server.c | 79 +++++++++++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 60 insertions(+), 19 deletions(-)

diff --git a/nbd/server.c b/nbd/server.c
index a8ddc4a..a9fec45 100644
--- a/nbd/server.c
+++ b/nbd/server.c
@@ -1844,37 +1844,68 @@ static int coroutine_fn nbd_co_send_sparse_read(NBDClient *client,
     return ret;
 }
 
-static int blockstatus_to_extent_be(BlockDriverState *bs, uint64_t offset,
-                                    uint64_t bytes, NBDExtent *extent)
+/*
+ * Populate @extents from block status. Update @bytes to be the actual
+ * length encoded (which may be smaller than the original), and update
+ * @nb_extents to the number of extents used.
+ *
+ * Returns zero on success and -errno on bdrv_block_status_above failure.
+ */
+static int blockstatus_to_extents(BlockDriverState *bs, uint64_t offset,
+                                  uint64_t *bytes, NBDExtent *extents,
+                                  unsigned int *nb_extents)
 {
-    uint64_t remaining_bytes = bytes;
+    uint64_t remaining_bytes = *bytes;
+    NBDExtent *extent = extents, *extents_end = extents + *nb_extents;
+    bool first_extent = true;
 
+    assert(*nb_extents);
     while (remaining_bytes) {
         uint32_t flags;
         int64_t num;
         int ret = bdrv_block_status_above(bs, NULL, offset, remaining_bytes,
                                           &num, NULL, NULL);
+
         if (ret < 0) {
             return ret;
         }
 
         flags = (ret & BDRV_BLOCK_ALLOCATED ? 0 : NBD_STATE_HOLE) |
                 (ret & BDRV_BLOCK_ZERO      ? NBD_STATE_ZERO : 0);
+        offset += num;
+        remaining_bytes -= num;
 
-        if (remaining_bytes == bytes) {
+        if (first_extent) {
             extent->flags = flags;
+            extent->length = num;
+            first_extent = false;
+            continue;
         }
 
-        if (flags != extent->flags) {
-            break;
+        if (flags == extent->flags) {
+            /* extend current extent */
+            extent->length += num;
+        } else {
+            if (extent + 1 == extents_end) {
+                break;
+            }
+
+            /* start new extent */
+            extent++;
+            extent->flags = flags;
+            extent->length = num;
         }
+    }
 
-        offset += num;
-        remaining_bytes -= num;
+    extents_end = extent + 1;
+
+    for (extent = extents; extent < extents_end; extent++) {
+        cpu_to_be32s(&extent->flags);
+        cpu_to_be32s(&extent->length);
     }
 
-    cpu_to_be32s(&extent->flags);
-    extent->length = cpu_to_be32(bytes - remaining_bytes);
+    *bytes -= remaining_bytes;
+    *nb_extents = extents_end - extents;
 
     return 0;
 }
@@ -1910,21 +1941,29 @@ static int nbd_co_send_extents(NBDClient *client, uint64_t handle,
 /* Get block status from the exported device and send it to the client */
 static int nbd_co_send_block_status(NBDClient *client, uint64_t handle,
                                     BlockDriverState *bs, uint64_t offset,
-                                    uint32_t length, bool last,
-                                    uint32_t context_id, Error **errp)
+                                    uint32_t length, bool dont_fragment,
+                                    bool last, uint32_t context_id,
+                                    Error **errp)
 {
     int ret;
-    NBDExtent extent;
+    unsigned int nb_extents = dont_fragment ? 1 : NBD_MAX_BITMAP_EXTENTS;
+    NBDExtent *extents = g_new(NBDExtent, nb_extents);
+    uint64_t final_length = length;
 
-    ret = blockstatus_to_extent_be(bs, offset, length, &extent);
+    ret = blockstatus_to_extents(bs, offset, &final_length, extents,
+                                 &nb_extents);
     if (ret < 0) {
+        g_free(extents);
         return nbd_co_send_structured_error(
                 client, handle, -ret, "can't get block status", errp);
     }
 
-    return nbd_co_send_extents(client, handle, &extent, 1,
-                               be32_to_cpu(extent.length), last,
-                               context_id, errp);
+    ret = nbd_co_send_extents(client, handle, extents, nb_extents,
+                              final_length, last, context_id, errp);
+
+    g_free(extents);
+
+    return ret;
 }
 
 /*
@@ -2232,10 +2271,12 @@ static coroutine_fn int nbd_handle_request(NBDClient *client,
             (client->export_meta.base_allocation ||
              client->export_meta.bitmap))
         {
+            bool dont_fragment = request->flags & NBD_CMD_FLAG_REQ_ONE;
+
             if (client->export_meta.base_allocation) {
                 ret = nbd_co_send_block_status(client, request->handle,
                                                blk_bs(exp->blk), request->from,
-                                               request->len,
+                                               request->len, dont_fragment,
                                                !client->export_meta.bitmap,
                                                NBD_META_ID_BASE_ALLOCATION,
                                                errp);
@@ -2248,7 +2289,7 @@ static coroutine_fn int nbd_handle_request(NBDClient *client,
                 ret = nbd_co_send_bitmap(client, request->handle,
                                          client->exp->export_bitmap,
                                          request->from, request->len,
-                                         request->flags & NBD_CMD_FLAG_REQ_ONE,
+                                         dont_fragment,
                                          true, NBD_META_ID_DIRTY_BITMAP, errp);
                 if (ret < 0) {
                     return ret;
-- 
1.8.3.1