From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Date: Tue, 31 May 2011 11:26:07 +0000 (+0300)
Subject: UBIFS: fix clean znode counter corruption in error cases
X-Git-Tag: v3.0-rc2~11^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=837072377034d0a0b18b851d1ab95676b245cc0a;p=pandora-kernel.git

UBIFS: fix clean znode counter corruption in error cases

UBIFS maintains per-filesystem and global clean znode counters
('c->clean_zn_cnt' and 'ubifs_clean_zn_cnt'). It is important to maintain
correct values there since the shrinker relies on 'ubifs_clean_zn_cnt'.

However, in case of failures during commit the counters were corrupted. E.g.,
if a failure happens in the middle of 'write_index()', then some nodes in the
commit list ('c->cnext') are marked as clean, and some are marked as dirty. And
the 'ubifs_destroy_tnc_subtree()' frees does not retrun correct count, and we
end up with non-zero 'c->clean_zn_cnt' when unmounting. This means that if we
have 2 file-sytem and one of them fails, and we unmount it,
'ubifs_clean_zn_cnt' stays incorrect and confuses the shrinker.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
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