[GEDI] [PATCH 3/3] block/gluster: update .help of BLOCK_OPT_PREALLOC option

[Stefano Garzarella]

Show 'falloc' and 'full' among the allowed values of
'preallocation' option, only when they are supported
('falloc' is support if defined CONFIG_GLUSTERFS_FALLOCATE,
'full' is support if defined CONFIG_GLUSTERFS_ZEROFILL)

Signed-off-by: Stefano Garzarella <sgarzare at redhat.com>
---
 block/gluster.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/block/gluster.c b/block/gluster.c
index e664ca4462..682fe49912 100644
--- a/block/gluster.c
+++ b/block/gluster.c
@@ -97,7 +97,14 @@ static QemuOptsList qemu_gluster_create_opts = {
         {
             .name = BLOCK_OPT_PREALLOC,
             .type = QEMU_OPT_STRING,
-            .help = "Preallocation mode (allowed values: off, full)"
+            .help = "Preallocation mode (allowed values: off"
+#ifdef CONFIG_GLUSTERFS_FALLOCATE
+                    ", falloc"
+#endif
+#ifdef CONFIG_GLUSTERFS_ZEROFILL
+                    ", full"
+#endif
+                    ")"
         },
         {
             .name = GLUSTER_OPT_DEBUG,
-- 
2.20.1