executor: manually define struct fsxattr

It should be in <linux/fs.h> but is not there on some distros/arches as expected.

Travis build fails with:

      		<stdin>: In function ‘remove_dir’:
        		<stdin>:152:13: error: variable ‘attr’ has initializer but incomplete type
        		<stdin>:152:13: error: excess elements in struct initializer [-Werror]
        		<stdin>:152:13: error: (near initialization for ‘attr’) [-Werror]
        		<stdin>:152:21: error: storage size of ‘attr’ isn’t known
        		<stdin>:153:20: error: ‘FS_IOC_FSSETXATTR’ undeclared (first use in this function)
        		<stdin>:153:20: note: each undeclared identifier is reported only once for each function it appears in
        		<stdin>:152:21: error: unused variable ‘attr’ [-Werror=unused-variable]
        		cc1: all warnings being treated as errors

https://travis-ci.org/google/syzkaller/jobs/413574080

1 files changed, 13 insertions, 1 deletions

diff --git a/executor/common_linux.h b/executor/common_linux.h
index 2a1d14e2b..53684f646 100644
--- a/executor/common_linux.h
+++ b/executor/common_linux.h
@@ -1734,10 +1734,22 @@ static int do_sandbox_namespace(void)
 #if SYZ_EXECUTOR || SYZ_REPEAT && SYZ_USE_TMP_DIR
 #include <dirent.h>
 #include <errno.h>
-#include <linux/fs.h>
 #include <string.h>
+#include <sys/ioctl.h>
 #include <sys/mount.h>
 
+// This should be in <linux/fs.h> but is not there on some distros/arches as expected.
+struct fsxattr {
+	uint32 fsx_xflags;
+	uint32 fsx_extsize;
+	uint32 fsx_nextents;
+	uint32 fsx_projid;
+	uint32 fsx_cowextsize;
+	char fsx_pad[8];
+};
+
+#define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr)
+
 // One does not simply remove a directory.
 // There can be mounts, so we need to try to umount.
 // Moreover, a mount can be mounted several times, so we need to try to umount in a loop.