MFC r283496:

The latest cp tool is trying to use the btrfs clone operation that is
implemented via ioctl interface. First of all return ENOTSUP for this
operation as a cp fallback to usual method in that case. Secondly, do
not print out the message about unimplemented operation.

2 files changed, 16 insertions, 3 deletions

diff --git a/sys/compat/linux/linux_ioctl.c b/sys/compat/linux/linux_ioctl.c
index 3dcf13b..8858e2f 100644
--- a/sys/compat/linux/linux_ioctl.c
+++ b/sys/compat/linux/linux_ioctl.c
@@ -3595,9 +3595,16 @@ linux_ioctl(struct thread *td, struct linux_ioctl_args *args)
 	sx_sunlock(&linux_ioctl_sx);
 	fdrop(fp, td);
 
-	linux_msg(td, "ioctl fd=%d, cmd=0x%x ('%c',%d) is not implemented",
-	    args->fd, (int)(args->cmd & 0xffff),
-	    (int)(args->cmd & 0xff00) >> 8, (int)(args->cmd & 0xff));
+	switch (args->cmd & 0xffff) {
+	case LINUX_BTRFS_IOC_CLONE:
+		return (ENOTSUP);
+
+	default:
+		linux_msg(td, "ioctl fd=%d, cmd=0x%x ('%c',%d) is not implemented",
+		    args->fd, (int)(args->cmd & 0xffff),
+		    (int)(args->cmd & 0xff00) >> 8, (int)(args->cmd & 0xff));
+		break;
+	}
 
 	return (EINVAL);
 }
diff --git a/sys/compat/linux/linux_ioctl.h b/sys/compat/linux/linux_ioctl.h
index 9419152..873937d 100644
--- a/sys/compat/linux/linux_ioctl.h
+++ b/sys/compat/linux/linux_ioctl.h
@@ -745,6 +745,12 @@
 #define	FBSD_LUSB_MIN			0xffdd
 
 /*
+ * Linux btrfs clone operation
+ */
+#define LINUX_BTRFS_IOC_CLONE		0x9409 /* 0x40049409 */
+
+
+/*
  * Pluggable ioctl handlers
  */
 struct linux_ioctl_args;