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block/block-copy: always align copied region to cluster size 

Since commit 42ac214406 (block/block-copy: refactor task creation)
block_copy_task_create calculates the area to be copied via
bdrv_dirty_bitmap_next_dirty_area, but that can return an unaligned byte
count if the image's last cluster end is not aligned to the bitmap's
granularity.

Always ALIGN_UP the resulting bytes value to satisfy block_copy_do_copy,
which requires the 'bytes' parameter to be aligned to cluster size.

Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
Message-Id: <20200810095523.15071-1-s.reiter@proxmox.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Stefan Reiter 2020-08-10 11:55:22 +02:00 committed by Max Reitz
parent e1d322c405
commit 7661a886a1
1 changed files with 3 additions and 0 deletions
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3
block/block-copy.c
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@ -142,6 +142,9 @@ static BlockCopyTask *block_copy_task_create(BlockCopyState *s,
return NULL;
}
assert(QEMU_IS_ALIGNED(offset, s->cluster_size));
bytes = QEMU_ALIGN_UP(bytes, s->cluster_size);
/* region is dirty, so no existent tasks possible in it */
assert(!find_conflicting_task(s, offset, bytes));