libglusterfsclient: update offset in glusterfs_read_async_cbk only if offset stored in fd_ctx is used.

- this helps in implementing sendfile(2). manpage says that
    "If offset is  not  NULL,  then sendfile()  does  not modify the current
     file offset of in_fd"

Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/libglusterfsclient/src/libglusterfsclient-internals.h b/libglusterfsclient/src/libglusterfsclient-internals.h
index d55cfb1f5f6..9b14dcb9153 100755
--- a/libglusterfsclient/src/libglusterfsclient-internals.h
+++ b/libglusterfsclient/src/libglusterfsclient-internals.h
@@ -131,6 +131,7 @@ typedef struct libglusterfs_client_async_local {
                 struct {
                         fd_t *fd;
                         glusterfs_readv_cbk_t cbk;
+                        char update_offset;
                 }readv_cbk;
     
                 struct {