From: Jens Axboe <jens.axboe@oracle.com>
Date: Thu, 24 Sep 2009 13:25:11 +0000 (+0200)
Subject: writeback: make the super_block pinning more efficient
X-Git-Tag: v2.6.32-rc1~24^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9ecc2738ac2371f88dff5d48914b4e35c45203cd;p=pandora-kernel.git

writeback: make the super_block pinning more efficient

Currently we pin the inode->i_sb for every single inode. This
increases cache traffic on sb->s_umount sem. Lets instead
cache the inode sb pin state and keep the super_block pinned
for as long as keep writing out inodes from the same
super_block.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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