git: 68230041eb29 - stable/13 - Add nameicap_cleanup_from(), to clean tracker list starting from some element

[Konstantin Belousov]

The branch stable/13 has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=68230041eb292f26132c73de9369e695ab6ada6e

commit 68230041eb292f26132c73de9369e695ab6ada6e
Author:     Konstantin Belousov <kib at FreeBSD.org>
AuthorDate: 2021-02-28 00:14:43 +0000
Commit:     Konstantin Belousov <kib at FreeBSD.org>
CommitDate: 2021-03-04 19:11:05 +0000

    Add nameicap_cleanup_from(), to clean tracker list starting from some element
    
    (cherry picked from commit e8a2862aa0384c75603f801625e309a3dae0ed05)
---
 sys/kern/vfs_lookup.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/sys/kern/vfs_lookup.c b/sys/kern/vfs_lookup.c
index cdd4a914239f..abc01c73e24c 100644
--- a/sys/kern/vfs_lookup.c
+++ b/sys/kern/vfs_lookup.c
@@ -192,19 +192,26 @@ nameicap_tracker_add(struct nameidata *ndp, struct vnode *dp)
 }
 
 static void
-nameicap_cleanup(struct nameidata *ndp)
+nameicap_cleanup_from(struct nameidata *ndp, struct nameicap_tracker *first)
 {
 	struct nameicap_tracker *nt, *nt1;
 
-	KASSERT(TAILQ_EMPTY(&ndp->ni_cap_tracker) ||
-	    (ndp->ni_lcf & NI_LCF_CAP_DOTDOT) != 0, ("not strictrelative"));
-	TAILQ_FOREACH_SAFE(nt, &ndp->ni_cap_tracker, nm_link, nt1) {
+	nt = first;
+	TAILQ_FOREACH_FROM_SAFE(nt, &ndp->ni_cap_tracker, nm_link, nt1) {
 		TAILQ_REMOVE(&ndp->ni_cap_tracker, nt, nm_link);
 		vdrop(nt->dp);
 		free(nt, M_NAMEITRACKER);
 	}
 }
 
+static void
+nameicap_cleanup(struct nameidata *ndp)
+{
+	KASSERT(TAILQ_EMPTY(&ndp->ni_cap_tracker) ||
+	    (ndp->ni_lcf & NI_LCF_CAP_DOTDOT) != 0, ("not strictrelative"));
+	nameicap_cleanup_from(ndp, NULL);
+}
+
 /*
  * For dotdot lookups in capability mode, only allow the component
  * lookup to succeed if the resulting directory was already traversed