git: d3c3a705b5e6 - main - autofs: try to avoid waiting for timeouts of in-flight requests for forced unmounts

The branch main has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=d3c3a705b5e6689798057b764713bfc0e3b69f6a

commit d3c3a705b5e6689798057b764713bfc0e3b69f6a
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2026-08-04 06:26:56 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2026-08-06 08:54:47 +0000

    autofs: try to avoid waiting for timeouts of in-flight requests for forced unmounts
    
    Do the advisory aborts of the in-flight requests before flushing the
    vnodes.  It should mostly eliminate the waits due to requests busying
    the mp.
    
    Reported and reviewed by:       rew
    Sponsored by:   The FreeBSD Foundation
    MFC after:      1 week
    Differential revision:  https://reviews.freebsd.org/D58637
---
 sys/fs/autofs/autofs_vfsops.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/sys/fs/autofs/autofs_vfsops.c b/sys/fs/autofs/autofs_vfsops.c
index 2159902f8b40..7e1d7c9d1f6a 100644
--- a/sys/fs/autofs/autofs_vfsops.c
+++ b/sys/fs/autofs/autofs_vfsops.c
@@ -109,6 +109,33 @@ autofs_mount(struct mount *mp)
 	return (0);
 }
 
+/*
+ * Try to abort any requests currently in flight.  This is not
+ * strictly necessary, the strong pass is done after all vnodes are
+ * reclaimed, and does not prevent new requests from queueing.  But
+ * doing it now should practically avoid waiting for timeouts because
+ * each in-flight requests busies the mount point, which makes
+ * unmount() to wait for it to drain.
+ */
+static void
+autofs_purge(struct mount *mp)
+{
+	struct autofs_mount *amp;
+	struct autofs_request *ar;
+
+	amp = VFSTOAUTOFS(mp);
+	sx_xlock(&autofs_softc->sc_lock);
+	TAILQ_FOREACH(ar, &autofs_softc->sc_requests, ar_next) {
+		if (ar->ar_mount != amp)
+			continue;
+		ar->ar_error = ENXIO;
+		ar->ar_done = true;
+		ar->ar_in_progress = false;
+	}
+	sx_xunlock(&autofs_softc->sc_lock);
+	cv_broadcast(&autofs_softc->sc_cv);
+}
+
 static int
 autofs_unmount(struct mount *mp, int mntflags)
 {
@@ -208,6 +235,7 @@ static struct vfsops autofs_vfsops = {
 	.vfs_fhtovp =		NULL, /* XXX */
 	.vfs_mount =		autofs_mount,
 	.vfs_unmount =		autofs_unmount,
+	.vfs_purge =		autofs_purge,
 	.vfs_root =		autofs_root,
 	.vfs_statfs =		autofs_statfs,
 	.vfs_init =		autofs_init,