block/gluster: update .help of BLOCK_OPT_PREALLOC option
Add missing 'falloc' among the allowed values of 'preallocation' option; show it and 'full' only when they are supported. ('falloc' is supported if defined CONFIG_GLUSTERFS_FALLOCATE, 'full' is supported if defined CONFIG_GLUSTERFS_ZEROFILL) Signed-off-by: NStefano Garzarella <sgarzare@redhat.com> Reviewed-by: NMarkus Armbruster <armbru@redhat.com> Message-Id: <20190524075848.23781-4-sgarzare@redhat.com> Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
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