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qcow2: fix flushing after dirty bitmap metadata writes

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update_header_sync itself does not need to flush the caches to disk.
The only paths that allocate clusters are:

- bitmap_list_store with in_place=false, called by update_ext_header_and_dir

- store_bitmap_data, called by store_bitmap

- store_bitmap, called by qcow2_store_persistent_dirty_bitmaps and
  followed by update_ext_header_and_dir

So in the end the central place where we need to flush the caches
is update_ext_header_and_dir.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2018-03-01 17:36:15 +01:00 committed by Kevin Wolf
parent 8b220eb7c8
commit 1a0c2bfb03
1 changed files with 2 additions and 2 deletions
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4
block/qcow2-bitmap.c
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@ -110,7 +110,7 @@ static int update_header_sync(BlockDriverState *bs)
return ret;
}
return bdrv_flush(bs);
return bdrv_flush(bs->file->bs);
}
static inline void bitmap_table_to_be(uint64_t *bitmap_table, size_t size)
@ -882,7 +882,7 @@ static int update_ext_header_and_dir(BlockDriverState *bs,
return ret;
}
ret = bdrv_flush(bs->file->bs);
ret = qcow2_flush_caches(bs);
if (ret < 0) {
goto fail;
}