Explain why it is safe to unlock the vnode.

Requested by:	kib

1 files changed, 3 insertions, 0 deletions

diff --git a/sys/kern/imgact_elf.c b/sys/kern/imgact_elf.c
index f7e5752..4da2ad78 100644
--- a/sys/kern/imgact_elf.c
+++ b/sys/kern/imgact_elf.c
@@ -800,6 +800,9 @@ __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
 	 * than zero.  Consequently, the vnode lock is not needed by vrele().
 	 * However, in cases where the vnode lock is external, such as nullfs,
 	 * v_usecount may become zero.
+	 *
+	 * The VV_TEXT flag prevents modifications to the executable while
+	 * the vnode is unlocked.
 	 */
 	VOP_UNLOCK(imgp->vp, 0);