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author | Eric Blake <eblake@redhat.com> | 2018-10-29 16:23:17 -0400 |
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committer | John Snow <jsnow@redhat.com> | 2018-10-29 16:23:17 -0400 |
commit | d1dde7149e376d72b422a529ec4bf3ed47f3ba30 (patch) | |
tree | cb9309127c2851e6e13394a4253fcb235d46873b /block/parallels.c | |
parent | d9782022bda7f8eccaf961044e9efe980dc90c04 (diff) |
bitmap: Update count after a merge
We need an accurate count of the number of bits set in a bitmap
after a merge. In particular, since the merge operation short-circuits
a merge from an empty source, if you have bitmaps A, B, and C where
B started empty, then merge C into B, and B into A, an inaccurate
count meant that A did not get the contents of C.
In the worst case, we may falsely regard the bitmap as empty when
it has had new writes merged into it.
Fixes: be58721db
CC: qemu-stable@nongnu.org
Signed-off-by: Eric Blake <eblake@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 20181002233314.30159-1-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
Diffstat (limited to 'block/parallels.c')
0 files changed, 0 insertions, 0 deletions