svn commit: r352450 - head/sys/kern
Mateusz Guzik
mjg at FreeBSD.org
Tue Sep 17 15:53:41 UTC 2019
Author: mjg
Date: Tue Sep 17 15:53:40 2019
New Revision: 352450
URL: https://svnweb.freebsd.org/changeset/base/352450
Log:
vfs: apply r352437 to the fast path as well
This one is very hard to run into. If the filesystem is being unmounted or
the mount point is freed the vfs_op_thread_enter will fail. For it to
succeed the mount point itself would have to be reallocated in the time
window between the initial read and the attempt to enter.
Sponsored by: The FreeBSD Foundation
Modified:
head/sys/kern/vfs_default.c
Modified: head/sys/kern/vfs_default.c
==============================================================================
--- head/sys/kern/vfs_default.c Tue Sep 17 14:15:48 2019 (r352449)
+++ head/sys/kern/vfs_default.c Tue Sep 17 15:53:40 2019 (r352450)
@@ -606,11 +606,13 @@ vop_stdgetwritemount(ap)
return (0);
}
if (vfs_op_thread_enter(mp)) {
- if (mp == vp->v_mount)
+ if (mp == vp->v_mount) {
vfs_mp_count_add_pcpu(mp, ref, 1);
- else
+ vfs_op_thread_exit(mp);
+ } else {
+ vfs_op_thread_exit(mp);
mp = NULL;
- vfs_op_thread_exit(mp);
+ }
} else {
MNT_ILOCK(mp);
if (mp == vp->v_mount) {
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