Date: Mon, 13 Oct 2025 00:30:11 GMT From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: f4d5c6d65168 - stable/14 - vm_fault: add helper vm_fault_can_cow_rename() Message-ID: <202510130030.59D0UBxl045236@gitrepo.freebsd.org>
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The branch stable/14 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=f4d5c6d65168d3d9b99a2332d854c14b231188e6 commit f4d5c6d65168d3d9b99a2332d854c14b231188e6 Author: Konstantin Belousov <kib@FreeBSD.org> AuthorDate: 2025-07-24 10:47:52 +0000 Commit: Konstantin Belousov <kib@FreeBSD.org> CommitDate: 2025-10-13 00:23:45 +0000 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. */
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