lstat/stat/fstat: Use 64bit version of syscall if available

This is needed for stat'ing loop devices > 255
since otherwise kernel returns EOVERFLOW becasue
it needs st_rdev/st_dev to be larger than 16bits but
in kernel it uses __old_kernel_stat for stat
syscall which has st_rdev/st_dev as unsigned short

Add a testcase

Signed-off-by: Khem Raj <raj.khem@gmail.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/test/stat/stat-loop256.c b/test/stat/stat-loop256.c
new file mode 100644
index 000000000..14284c184
--- /dev/null
+++ b/test/stat/stat-loop256.c
@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+int main()
+{
+    struct stat statbuf;
+    int ret = 0;
+    char* loop255 = "/dev/loop255";
+    char* loop256 = "/dev/loop256";
+    mode_t mode = 0660;
+    mknod(loop255, mode, 0x7ff);
+    mknod(loop256, mode, 0x100700);
+    ret = stat(loop255, &statbuf);
+    if(ret < 0) {
+	printf("stat: Cant stat %s\n",loop255);
+	unlink(loop255);
+	exit(1);
+    }
+    ret = stat(loop256, &statbuf);
+    if(ret < 0) {
+        printf("stat: Cant stat %s\n",loop256);
+	unlink(loop255);
+	unlink(loop256);
+        exit(1);
+    }
+
+    unlink(loop255);
+    unlink(loop256);
+    exit(0);
+}
+