linux-kernel - Re: [PATCH 11/18] fs: Introduce per-bucket inode hash locks

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Date:	Fri, 8 Oct 2010 14:54:09 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/18] fs: Introduce per-bucket inode hash locks

> +struct inode_hash_bucket {
> +	struct hlist_bl_head head;
> +};
> +
> +static inline void spin_lock_bucket(struct inode_hash_bucket *b)
> +{
> +	bit_spin_lock(0, (unsigned long *)b);
> +}
> +
> +static inline void spin_unlock_bucket(struct inode_hash_bucket *b)
> +{
> +	__bit_spin_unlock(0, (unsigned long *)b);
> +}

I've looked at the dcache version of this again, and I really hate
duplicating these helpers in the dcache code aswell.  IMHO they
should simple operate directly on the hlist_bl_head, as that's
what it was designed for.  I also don't really see any point in
wrapping the hlist_bl_head as inode_hash_bucket.  If the bucket naming
is important we could rename the hlist_bl stuff to bl_hash, and the
hlist_bl_head could become bl_hash_bucket.

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