File pr790.patch of Package snapper.29460

diff --git a/snapper/BtrfsUtils.cc b/snapper/BtrfsUtils.cc
index 53bcb92a..47193ed1 100644
--- a/snapper/BtrfsUtils.cc
+++ b/snapper/BtrfsUtils.cc
@@ -284,21 +284,25 @@
 	    struct btrfs_ioctl_quota_rescan_args args;
 	    memset(&args, 0, sizeof(args));
 
-	    if (ioctl(fd, BTRFS_IOC_QUOTA_RESCAN, &args) < 0)
-		throw runtime_error_with_errno("ioctl(BTRFS_IOC_QUOTA_RESCAN) failed", errno);
-
-	    while (true)
+	    for (int i = 0;; ++i)
 	    {
-		sleep(1);
-
-		memset(&args, 0, sizeof(args));
+		if (ioctl(fd, BTRFS_IOC_QUOTA_RESCAN, &args) == 0)
+		    break;
 
-		if (ioctl(fd, BTRFS_IOC_QUOTA_RESCAN_STATUS, &args) < 0)
-		    throw runtime_error_with_errno("ioctl(BTRFS_IOC_QUOTA_RESCAN_STATUS) failed", errno);
+		if (errno == EINPROGRESS)
+		{
+		    if (i == 0)
+			y2war("waiting for old quota rescan to finish");
+
+		    sleep(1);
+		    continue;
+		}
 
-		if (!args.flags)
-		    break;
+		throw runtime_error_with_errno("ioctl(BTRFS_IOC_QUOTA_RESCAN) failed", errno);
 	    }
+
+	    if (ioctl(fd, BTRFS_IOC_QUOTA_RESCAN_WAIT, &args) < 0)
+		throw runtime_error_with_errno("ioctl(BTRFS_IOC_QUOTA_WAIT_RESCAN) failed", errno);
 	}