From: bharrosh@panasas.com <bharrosh@panasas.com>
Date: Thu, 7 Oct 2010 18:28:18 +0000 (-0400)
Subject: exofs: Override read-ahead to align on stripe_size
X-Git-Tag: v2.6.39-rc1~97^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=66cd6cad4919f980dd21307d0150ff251762a264;p=pandora-kernel.git

exofs: Override read-ahead to align on stripe_size

* Set all inode->i_mapping->backing_dev_info to point to
  the per super-block sb->s_bdi.

* Calculating a read_ahead that is:
  - preferable 2 stripes long
    (Future patch will add a mount option to override this)
  - Minimum 128K aligned up to stripe-size
  - Caped to maximum-IO-sizes round down to stripe_size.
    (Max sizes are governed by max bio-size that fits in a page
     times number-of-devices)

CC: Marc Dionne <marc.c.dionne@gmail.com>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---

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