linux-ext4 - Re: [PATCH] ext4: rework reserved cluster accounting when invalidating pages

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Message-ID: <20190824001728.GA19348@mit.edu>
Date:   Fri, 23 Aug 2019 20:17:28 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Eric Whitney <enwlinux@...il.com>
Cc:     linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: rework reserved cluster accounting when
 invalidating pages

On Sat, Aug 17, 2019 at 03:31:03PM -0400, Eric Whitney wrote:
> The goal of this patch is to remove two references to the buffer delay
> bit in ext4_da_page_release_reservation() as part of a larger effort
> to remove all such references from ext4.  These two references are
> principally used to reduce the reserved block/cluster count when pages
> are invalidated as a result of truncating, punching holes, or
> collapsing a block range in a file.  The entire function is removed
> and replaced with code in ext4_es_remove_extent() that reduces the
> reserved count as a side effect of removing a block range from delayed
> and not unwritten extents in the extent status tree as is done when
> truncating, punching holes, or collapsing ranges.
> 
> The code is written to minimize the number of searches descending from
> rb tree roots for scalability.
> 
> Signed-off-by: Eric Whitney <enwlinux@...il.com>

Thanks, applied.

					- Ted