From 655923df4be82ac23efc6862d35f569d05824e42 Mon Sep 17 00:00:00 2001 From: Pavel Butsykin Date: Fri, 22 Jul 2016 11:17:47 +0300 Subject: qcow: cleanup qcow_co_pwritev_compressed to avoid the recursion Now that the function uses a vector instead of a buffer, there is no need to use recursive code. Signed-off-by: Pavel Butsykin Reviewed-by: Stefan Hajnoczi Signed-off-by: Denis V. Lunev CC: Jeff Cody CC: Markus Armbruster CC: Eric Blake CC: John Snow CC: Stefan Hajnoczi CC: Kevin Wolf Signed-off-by: Kevin Wolf --- block/qcow.c | 24 +++++++----------------- 1 file changed, 7 insertions(+), 17 deletions(-) (limited to 'block') diff --git a/block/qcow.c b/block/qcow.c index 1b9c911..94f01b3 100644 --- a/block/qcow.c +++ b/block/qcow.c @@ -927,27 +927,17 @@ qcow_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset, uint8_t *buf, *out_buf; uint64_t cluster_offset; + buf = qemu_blockalign(bs, s->cluster_size); if (bytes != s->cluster_size) { - ret = -EINVAL; - - /* Zero-pad last write if image size is not cluster aligned */ - if (offset + bytes == bs->total_sectors << BDRV_SECTOR_BITS && - bytes < s->cluster_size) + if (bytes > s->cluster_size || + offset + bytes != bs->total_sectors << BDRV_SECTOR_BITS) { - uint8_t *pad_buf = qemu_blockalign(bs, s->cluster_size); - memset(pad_buf, 0, s->cluster_size); - qemu_iovec_to_buf(qiov, 0, pad_buf, s->cluster_size); - iov = (struct iovec) { - .iov_base = pad_buf, - .iov_len = s->cluster_size, - }; - qemu_iovec_init_external(&hd_qiov, &iov, 1); - ret = qcow_co_pwritev_compressed(bs, offset, bytes, &hd_qiov); - qemu_vfree(pad_buf); + qemu_vfree(buf); + return -EINVAL; } - return ret; + /* Zero-pad last write if image size is not cluster aligned */ + memset(buf + bytes, 0, s->cluster_size - bytes); } - buf = qemu_blockalign(bs, s->cluster_size); qemu_iovec_to_buf(qiov, 0, buf, qiov->size); out_buf = g_malloc(s->cluster_size); -- cgit v1.1