From: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Date: Thu, 26 Mar 2009 17:51:39 +0000 (+0900)
Subject: nilfs2: fix lockdep recursive locking warning on bmap
X-Git-Tag: v2.6.30-rc2~5^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bcb48891b05b4179edc86298d3dccb2ce90d5413;p=pandora-kernel.git

nilfs2: fix lockdep recursive locking warning on bmap

The bmap semaphore of DAT file can be held while a bmap of other files
is locked.  This has caused the following false detection of lockdep
check:

mount.nilfs2/4667 is trying to acquire lock:
 (&bmap->b_sem){..--}, at: [<d0c6c4b4>] nilfs_bmap_lookup_at_level+0x1a/0x74 [nilfs2]

but task is already holding lock:
 (&bmap->b_sem){..--}, at: [<d0c6c4b4>] nilfs_bmap_lookup_at_level+0x1a/0x74 [nilfs2]

This will fix the false detection by distinguishing semaphores of the
DAT and other files.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
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