From: Sage Weil <sage@inktank.com>
Date: Thu, 30 Aug 2012 22:26:15 +0000 (-0600)
Subject: Btrfs: pass lockdep rwsem metadata to async commit transaction
X-Git-Tag: v3.7-rc1~71^2~82
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6fc4e3548598d10a5e947797a09cbc1b257a22ab;p=pandora-kernel.git

Btrfs: pass lockdep rwsem metadata to async commit transaction

The freeze rwsem is taken by sb_start_intwrite() and dropped during the
commit_ or end_transaction().  In the async case, that happens in a worker
thread.  Tell lockdep the calling thread is releasing ownership of the
rwsem and the async thread is picking it up.

XFS plays the same trick in fs/xfs/xfs_aops.c.

Signed-off-by: Sage Weil <sage@inktank.com>
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