tree ca2364878d9f65a4472f3ae4a658b69a570ee093
parent 5f972797b1b97ab94ef48188321bff6cc190a2e0
author Alex Ng <alexng@messages.microsoft.com> 1502050372 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1502900082 -0700

Tools: hv: vss: Skip freezing filesystems backed by loop

Since a loop device is backed by a file, a backup will already result in
its parent filesystem being frozen. It's sufficient to just freeze the
parent filesystem, so we can skip the loop device.

This avoids a situation where a loop device and its parent filesystem are
both frozen and then thawed out of order. For example, if the loop device
is enumerated first, we would thaw it while its parent filesystem is still
frozen. The thaw operation fails and the loop device remains frozen.

Signed-off-by: Alex Ng <alexng@messages.microsoft.com>
Signed-off-by: Vyronas Tsingaras <vyronas@vtsingaras.me>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>