Merge remote-tracking branch 'remotes/maxreitz/tags/pull-block-2019-08-06' into staging

Block patches for 4.1.0-rc4:
- Fix the backup block job when using copy offloading
- Fix the mirror block job when using the write-blocking copy mode
- Fix incremental backups after the image has been grown with the
  respective bitmap attached to it

# gpg: Signature made Tue 06 Aug 2019 12:57:07 BST
# gpg:                using RSA key 91BEB60A30DB3E8857D11829F407DB0061D5CF40
# gpg:                issuer "mreitz@redhat.com"
# gpg: Good signature from "Max Reitz <mreitz@redhat.com>" [full]
# Primary key fingerprint: 91BE B60A 30DB 3E88 57D1  1829 F407 DB00 61D5 CF40

* remotes/maxreitz/tags/pull-block-2019-08-06:
  block/backup: disable copy_range for compressed backup
  iotests: Test unaligned blocking mirror write
  mirror: Only mirror granularity-aligned chunks
  iotests: Test incremental backup after truncation
  util/hbitmap: update orig_size on truncate
  iotests: Test backup job with two guest writes
  backup: Copy only dirty areas

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/util/hbitmap.c b/util/hbitmap.c
index 7905212..bcc0acd 100644
--- a/util/hbitmap.c
+++ b/util/hbitmap.c
@@ -53,7 +53,9 @@
  */
 
 struct HBitmap {
-    /* Size of the bitmap, as requested in hbitmap_alloc. */
+    /*
+     * Size of the bitmap, as requested in hbitmap_alloc or in hbitmap_truncate.
+     */
     uint64_t orig_size;
 
     /* Number of total bits in the bottom level.  */
@@ -732,6 +734,8 @@ void hbitmap_truncate(HBitmap *hb, uint64_t size)
     uint64_t num_elements = size;
     uint64_t old;
 
+    hb->orig_size = size;
+
     /* Size comes in as logical elements, adjust for granularity. */
     size = (size + (1ULL << hb->granularity) - 1) >> hb->granularity;
     assert(size <= ((uint64_t)1 << HBITMAP_LOG_MAX_SIZE));