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Date:   Thu, 23 Nov 2017 12:25:01 +1100
From:   Dave Chinner <>
To:     Matthew Wilcox <>
        Matthew Wilcox <>
Subject: Re: [PATCH 00/62] XArray November 2017 Edition

On Wed, Nov 22, 2017 at 01:06:37PM -0800, Matthew Wilcox wrote:
> From: Matthew Wilcox <>
> I've lost count of the number of times I've posted the XArray before,
> so time for a new numbering scheme.  Here're two earlier versions,
> (this one's more loquacious in its
> description of things that are better about the radix tree API than the
> XArray).
> This time around, I've gone for an approach of many small changes.
> Unfortunately, that means you get 62 moderate patches instead of dozens
> of big ones.

Where's the API documentation that tells things like constraints
about locking and lock-less lookups via RCU?

e.g. I notice in the XFS patches you seem to randomly strip out
rcu_read_lock/unlock() pairs that are currently around radix tree
lookup operations without explanation. Without documentation
describing how this stuff is supposed to work, review is somewhat


Dave Chinner

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