From: Henry C Chang <henry.cy.chang@gmail.com>
Date: Wed, 11 May 2011 10:29:54 +0000 (+0000)
Subject: ceph: do not use i_wrbuffer_ref as refcount for Fb cap
X-Git-Tag: v2.6.39~45^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d3d0720d4a7a46e93e055e5b0f1a8bd612743ed6;p=pandora-kernel.git

ceph: do not use i_wrbuffer_ref as refcount for Fb cap

We increments i_wrbuffer_ref when taking the Fb cap. This breaks
the dirty page accounting and causes looping in
__ceph_do_pending_vmtruncate, and ceph client hangs.

This bug can be reproduced occasionally by running blogbench.

Add a new field i_wb_ref to inode and dedicate it to Fb reference
counting.

Signed-off-by: Henry C Chang <henry.cy.chang@gmail.com>
Signed-off-by: Sage Weil <sage@newdream.net>
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