Author: alc
Date: Tue Jan 17 16:20:50 2012
New Revision: 230268
URL: http://svn.freebsd.org/changeset/base/230268
Log:
Explain why it is safe to unlock the vnode.
Requested by: kib
Modified:
head/sys/kern/imgact_elf.c
Modified: head/sys/kern/imgact_elf.c
==============================================================================
--- head/sys/kern/imgact_elf.c Tue Jan 17 15:20:41 2012 (r230267)
+++ head/sys/kern/imgact_elf.c Tue Jan 17 16:20:50 2012 (r230268)
@@ -800,6 +800,9 @@ __CONCAT(exec_, __elfN(imgact))(struct i
* 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);
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