forked from luck/tmp_suning_uos_patched
vfs: remove unnecessary d_unhashed() check from __d_lookup_rcu
The check for d_unhashed() is not strictly incorrect, but at the same time it is also not sensible. The actual dentry removal from the dentry hash chains is totally asynchronous to the __d_lookup_rcu() logic, and we depend on __d_drop() updating the sequence number to invalidate any lookup of an unhashed dentry. So checking d_unhashed() is not incorrect, but it's not useful either: the code has to work correctly even without it. So just remove it. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -1871,8 +1871,6 @@ struct dentry *__d_lookup_rcu(const struct dentry *parent,
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seq = raw_seqcount_begin(&dentry->d_seq);
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if (dentry->d_parent != parent)
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continue;
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if (d_unhashed(dentry))
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continue;
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*seqp = seq;
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if (unlikely(parent->d_flags & DCACHE_OP_COMPARE)) {
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