glusterfs: update for new API

Apparently glusterfs just changes their API as they see fit. Add
a configure check for the newer version, which adds pre/post stat
variables in a few random spots.

This should fix compilation with v6.0 of the API.

Fixes: https://github.com/axboe/fio/issues/781
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/configure b/configure
index ee42166..b0052dc 100755
--- a/configure
+++ b/configure
@@ -1790,6 +1790,24 @@
 fi
 
 ##########################################
+# check for newer gfapi
+if test "$gfapi" = "yes" ; then
+gf_new="no"
+cat > $TMPC << EOF
+#include <glusterfs/api/glfs.h>
+
+int main(int argc, char **argv)
+{
+  return glfs_fsync(NULL, NULL, NULL) && glfs_ftruncate(NULL, 0, NULL, NULL);
+}
+EOF
+if compile_prog "" "-lgfapi -lglusterfs" "gf new api"; then
+  gf_new="yes"
+fi
+print_config "Gluster new API" "$gf_new"
+fi
+
+##########################################
 # check for gfapi trim support
 if test "$gf_trim" != "yes" ; then
   gf_trim="no"
@@ -2576,6 +2594,9 @@
 if test "$gf_trim" = "yes" ; then
   output_sym "CONFIG_GF_TRIM"
 fi
+if test "$gf_new" = "yes" ; then
+  output_sym "CONFIG_GF_NEW_API"
+fi
 if test "$libhdfs" = "yes" ; then
   output_sym "CONFIG_LIBHDFS"
   echo "FIO_HDFS_CPU=$FIO_HDFS_CPU" >> $config_host_mak
diff --git a/engines/glusterfs.c b/engines/glusterfs.c
index d0250b7..f2b84a2 100644
--- a/engines/glusterfs.c
+++ b/engines/glusterfs.c
@@ -288,7 +288,11 @@
 		    || sb.st_size < f->real_file_size) {
 			dprint(FD_FILE, "fio extend file %s from %jd to %" PRIu64 "\n",
 			       f->file_name, (intmax_t) sb.st_size, f->real_file_size);
+#if defined(CONFIG_GF_NEW_API)
+			ret = glfs_ftruncate(g->fd, f->real_file_size, NULL, NULL);
+#else
 			ret = glfs_ftruncate(g->fd, f->real_file_size);
+#endif
 			if (ret) {
 				log_err("failed fio extend file %s to %" PRIu64 "\n",
 					f->file_name, f->real_file_size);
@@ -350,7 +354,11 @@
 					       f->file_name);
 					glfs_unlink(g->fs, f->file_name);
 				} else if (td->o.create_fsync) {
+#if defined(CONFIG_GF_NEW_API)
+					if (glfs_fsync(g->fd, NULL, NULL) < 0) {
+#else
 					if (glfs_fsync(g->fd) < 0) {
+#endif
 						dprint(FD_FILE,
 						       "failed to sync, close %s\n",
 						       f->file_name);
diff --git a/engines/glusterfs_async.c b/engines/glusterfs_async.c
index 9e1c4bf..0392ad6 100644
--- a/engines/glusterfs_async.c
+++ b/engines/glusterfs_async.c
@@ -84,7 +84,12 @@
 	return 0;
 }
 
+#if defined(CONFIG_GF_NEW_API)
+static void gf_async_cb(glfs_fd_t * fd, ssize_t ret, struct glfs_stat *prestat,
+			struct glfs_stat *poststat, void *data)
+#else
 static void gf_async_cb(glfs_fd_t * fd, ssize_t ret, void *data)
+#endif
 {
 	struct io_u *io_u = data;
 	struct fio_gf_iou *iou = io_u->engine_data;
diff --git a/engines/glusterfs_sync.c b/engines/glusterfs_sync.c
index 099a5af..de73261 100644
--- a/engines/glusterfs_sync.c
+++ b/engines/glusterfs_sync.c
@@ -42,9 +42,17 @@
 	else if (io_u->ddir == DDIR_WRITE)
 		ret = glfs_write(g->fd, io_u->xfer_buf, io_u->xfer_buflen, 0);
 	else if (io_u->ddir == DDIR_SYNC)
+#if defined(CONFIG_GF_NEW_API)
+		ret = glfs_fsync(g->fd, NULL, NULL);
+#else
 		ret = glfs_fsync(g->fd);
+#endif
 	else if (io_u->ddir == DDIR_DATASYNC)
+#if defined(CONFIG_GF_NEW_API)
+		ret = glfs_fdatasync(g->fd, NULL, NULL);
+#else
 		ret = glfs_fdatasync(g->fd);
+#endif
 	else {
 		log_err("unsupported operation.\n");
 		io_u->error = EINVAL;