Add vfs_getattr compatibility for kernels < 4.14

Co-authored-by: backslashxx <118538522+backslashxx@users.noreply.github.com>
Signed-off-by: ShirkNeko <109797057+ShirkNeko@users.noreply.github.com>

kernel/Makefile

@@ -124,7 +124,6 @@ ifeq ($(shell grep "ssize_t kernel_write" $(srctree)/fs/read_write.c | grep -q "
 ccflags-y += -DKSU_OPTIONAL_KERNEL_WRITE
 endif
 ifeq ($(shell grep -q "inode_security_struct\s\+\*selinux_inode" $(srctree)/security/selinux/include/objsec.h; echo $$?),0)
-$(info -- KernelSU: kernel has selinux_inode.)
 ccflags-y += -DKSU_OPTIONAL_SELINUX_INODE
 endif
 ifeq ($(shell grep -q "int\s\+path_umount" $(srctree)/fs/namespace.c; echo $$?),0)
@@ -144,6 +143,12 @@ ifeq ($(shell grep -q "SEC_SELINUX_PORTING_COMMON" $(srctree)/security/selinux/a
 ccflags-y += -DSAMSUNG_SELINUX_PORTING
 endif
 
+# Check new vfs_getattr()
+ifeq ($(shell grep -A1 "^int vfs_getattr" $(srctree)/fs/stat.c | grep -q "query_flags" ; echo $$?),0)
+$(info -- KernelSU/compat: new vfs_getattr() found)
+ccflags-y += -DKSU_HAS_NEW_VFS_GETATTR
+endif
+
 # Custom Signs
 ifdef KSU_EXPECTED_SIZE
 ccflags-y += -DEXPECTED_SIZE=$(KSU_EXPECTED_SIZE)

kernel/throne_tracker.c

@@ -273,8 +273,23 @@ FILLDIR_RETURN_TYPE user_data_actor(struct dir_context *ctx, const char *name,
 		return FILLDIR_ACTOR_CONTINUE;
 	}
 
+/*
+4.11, also backported on lineage common kernel 4.9 !!
+int vfs_getattr(const struct path *path, struct kstat *stat,
+		u32 request_mask, unsigned int query_flags)
+
+4.10
+int vfs_getattr(struct path *path, struct kstat *stat)
+
+basically no mask and flags for =< 4.10
+
+*/
 	struct kstat stat;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,11,0) || defined(KSU_HAS_NEW_VFS_GETATTR)
 	err = vfs_getattr(&path, &stat, STATX_UID, AT_STATX_SYNC_AS_STAT);
+#else
+	err = vfs_getattr(&path, &stat);
+#endif
 	path_put(&path);
 	
 	if (err) {