qemu-options: Mention locking option of file driver

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

diff --git a/qemu-options.hx b/qemu-options.hx
index 3728e9b4ddfd79f6a89b0fd690db56914b8d1e02..f11c4ac960ff4046704e57b86613965f5a1674fb 100644 (file)
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -693,6 +693,10 @@ This is the protocol-level block driver for accessing regular files.
 The path to the image file in the local filesystem
 @item aio
 Specifies the AIO backend (threads/native, default: threads)
+@item locking
+Specifies whether the image file is protected with Linux OFD / POSIX locks. The
+default is to use the Linux Open File Descriptor API if available, otherwise no
+lock is applied.  (auto/on/off, default: auto)
 @end table
 Example:
 @example