From: Boaz Harrosh <bharrosh@panasas.com>
Date: Thu, 11 Feb 2010 11:01:39 +0000 (+0200)
Subject: exofs: groups support
X-Git-Tag: v2.6.34-rc1~201^2
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=50a76fd3c352ed2740eba01512efcfceee0703be;p=pandora-kernel.git

exofs: groups support

* _calc_stripe_info() changes to accommodate for grouping
  calculations. Returns additional information

* old _prepare_pages() becomes _prepare_one_group()
  which stores pages belonging to one device group.

* New _prepare_for_striping iterates on all groups calling
  _prepare_one_group().

* Enable mounting of groups data_maps (group_width != 0)

[QUESTION]
what is faster A or B;
A.	x += stride;
	x = x % width + first_x;

B	x += stride
	if (x < last_x)
		x = first_x;

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
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