git: fe66e4caf456 - main - rangelock: Disable cheat mode by default

The branch main has been updated by markj:

URL: https://cgit.FreeBSD.org/src/commit/?id=fe66e4caf4561ee3349ad7a29cc9976108c3b04f

commit fe66e4caf4561ee3349ad7a29cc9976108c3b04f
Author:     Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2024-08-27 20:31:25 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2024-08-27 20:36:31 +0000

    rangelock: Disable cheat mode by default
    
    Cheat mode is incompatible with code which locks multiple ranges in the
    same vnode, with at least one range being write-locked.  This can arise
    in kern_copy_file_range().  Until that's handled somehow, avoid the
    problem to make the fusefs tests stable.
    
    PR:             281073
    Fixes:          9ef425e560a9 ("rangelocks: add fast cheating mode")
    Reviewed by:    kib
    Differential Revision:  https://reviews.freebsd.org/D46457
---
 sys/kern/kern_rangelock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/kern/kern_rangelock.c b/sys/kern/kern_rangelock.c
index 14163dd1c782..38449f71a8b7 100644
--- a/sys/kern/kern_rangelock.c
+++ b/sys/kern/kern_rangelock.c
@@ -66,7 +66,7 @@
  * trylocks are same as normal locks but do not drain.
  */
 
-static int rangelock_cheat = 1;
+static int rangelock_cheat = 0;
 SYSCTL_INT(_debug, OID_AUTO, rangelock_cheat, CTLFLAG_RWTUN,
     &rangelock_cheat, 0,
     "");