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-rw-r--r--sys/fs/unionfs/union_vfsops.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/sys/fs/unionfs/union_vfsops.c b/sys/fs/unionfs/union_vfsops.c
index cb7b504..34e3900 100644
--- a/sys/fs/unionfs/union_vfsops.c
+++ b/sys/fs/unionfs/union_vfsops.c
@@ -287,6 +287,11 @@ unionfs_domount(struct mount *mp, struct thread *td)
ump->um_ufile = ufile;
ump->um_copymode = copymode;
+ MNT_ILOCK(mp);
+ if ((lowerrootvp->v_mount->mnt_kern_flag & MNTK_MPSAFE) &&
+ (upperrootvp->v_mount->mnt_kern_flag & MNTK_MPSAFE))
+ mp->mnt_kern_flag |= MNTK_MPSAFE;
+ MNT_IUNLOCK(mp);
mp->mnt_data = (qaddr_t)ump;
/*
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