Date: 2025-10-13 00:23:45 +0000
| raw e-mail | index | archive | help
vm_fault: add helper vm_fault_can_cow_rename()
(cherry picked from commit 3f05bbdbd80f2eefb647e595dc73e80d6186d6a5)
---
sys/vm/vm_fault.c | 20 +++++++++++---------
1 file changed, 11 insertions(+), 9 deletions(-)
diff --git a/sys/vm/vm_fault.c b/sys/vm/vm_fault.c
index 796b4c44b3f9..9ba96ab888d6 100644
--- a/sys/vm/vm_fault.c
+++ b/sys/vm/vm_fault.c
@@ -991,6 +991,16 @@ vm_fault_relookup(struct faultstate *fs)
return (KERN_SUCCESS);
}
+static bool
+vm_fault_can_cow_rename(struct faultstate *fs)
+{
+ return (
+ /* Only one shadow object and no other refs. */
+ fs->object->shadow_count == 1 && fs->object->ref_count == 1 &&
+ /* No other ways to look the object up. */
+ fs->object->handle == NULL && (fs->object->flags & OBJ_ANON) != 0);
+}
+
static void
vm_fault_cow(struct faultstate *fs)
{
@@ -1008,15 +1018,7 @@ vm_fault_cow(struct faultstate *fs)
* object so that it will go out to swap when needed.
*/
is_first_object_locked = false;
- if (
- /*
- * Only one shadow object and no other refs.
- */
- fs->object->shadow_count == 1 && fs->object->ref_count == 1 &&
- /*
- * No other ways to look the object up
- */
- fs->object->handle == NULL && (fs->object->flags & OBJ_ANON) != 0 &&
+ if (vm_fault_can_cow_rename(fs) &&
/*
* We don't chase down the shadow chain and we can acquire locks.
*/
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?>