vfs: add the missing vnode interlock in vfs_mountroot_shuffle
Around v_mountedhere assignment.
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@ -367,10 +367,12 @@ vfs_mountroot_shuffle(struct thread *td, struct mount *mpdevfs)
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error = vinvalbuf(vp, V_SAVE, 0, 0);
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if (!error) {
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cache_purge(vp);
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VI_LOCK(vp);
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mporoot->mnt_vnodecovered = vp;
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vp->v_mountedhere = mporoot;
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strlcpy(mporoot->mnt_stat.f_mntonname,
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fspath, MNAMELEN);
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VI_UNLOCK(vp);
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VOP_UNLOCK(vp);
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} else
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vput(vp);
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