From: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Date: Wed, 11 Nov 2009 13:37:59 +0000 (+0900)
Subject: nilfs2: remove buffer locking from btree code
X-Git-Tag: v2.6.33-rc1~322^2~43
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=30db4e6c3d51a89e4923e525303f714e6508bbd0;p=pandora-kernel.git

nilfs2: remove buffer locking from btree code

lock_buffer() and unlock_buffer() uses in btree.c are eliminable
because btree functions gain buffer heads through nilfs_btnode_get(),
which never returns an on-the-fly buffer.

Although nilfs_clear_dirty_page() and nilfs_copy_back_pages() in
nilfs_commit_gcdat_inode() juggle btree node buffers of DAT, this is
safe because these operations are protected by a log writer lock or
the metadata file semaphore of DAT.

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