1 files changed, 82 insertions, 0 deletions
diff --git a/tests/basic/fuse/seek.c b/tests/basic/fuse/seek.c
new file mode 100644
index 00000000000..30943ad0f33
--- /dev/null
+++ b/tests/basic/fuse/seek.c
@@ -0,0 +1,82 @@
+/* seek.c - use lseek() to find holes in a file
+ *
+ * Author: Niels de Vos <ndevos@redhat.com>
+ */
+
+/* needed for SEEK_HOLE/SEEK_DATA */
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int
+main(int argc, char **argv)
+{
+    int ret = EXIT_SUCCESS;
+    int fd = -1;
+    char *filename = NULL;
+    struct stat st = {
+        0,
+    };
+    off_t hole_start = 0;
+    off_t hole_end = 0;
+
+    if (argc != 2) {
+        fprintf(stderr, "Invalid argument, use %s <file>\n", argv[0]);
+        return EXIT_FAILURE;
+    }
+
+    filename = argv[1];
+
+    fd = open(filename, O_RDONLY);
+    if (fd <= 0) {
+        perror("open");
+        return EXIT_FAILURE;
+    }
+
+    if (fstat(fd, &st)) {
+        perror("fstat");
+        return EXIT_FAILURE;
+    }
+
+    while (hole_end < st.st_size) {
+        hole_start = lseek(fd, hole_end, SEEK_HOLE);
+        if (hole_start == -1 && errno == ENXIO) {
+            /* no more holes */
+            break;
+        } else if (hole_start == -1 && errno == ENOTSUP) {
+            /* SEEK_HOLE is not supported */
+            perror("lseek(SEEK_HOLE)");
+            ret = EXIT_FAILURE;
+            break;
+        } else if (hole_start == -1) {
+            perror("no more holes");
+            break;
+        }
+
+        hole_end = lseek(fd, hole_start, SEEK_DATA);
+        if (hole_end == -1 && errno == ENXIO) {
+            /* no more data */
+            break;
+        } else if (hole_end == -1 && errno == ENOTSUP) {
+            /* SEEK_DATA is not supported */
+            perror("lseek(SEEK_DATA)");
+            ret = EXIT_FAILURE;
+            break;
+        }
+
+        printf("HOLE found: %ld - %ld%s\n", hole_start, hole_end,
+               (hole_end == st.st_size) ? " (EOF)" : "");
+    }
+
+    close(fd);
+
+    return ret;
+}