From: Jan Kara <jack@suse.cz>
Date: Wed, 16 Sep 2009 17:22:48 +0000 (+0200)
Subject: fs: Fix busyloop in wb_writeback()
X-Git-Tag: v2.6.32-rc1~24^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a5989bdc981ec85e0734ac22519cc0b780813d7b;p=pandora-kernel.git

fs: Fix busyloop in wb_writeback()

If all inodes are under writeback (e.g. in case when there's only one inode
with dirty pages), wb_writeback() with WB_SYNC_NONE work basically degrades
to busylooping until I_SYNC flags of the inode is cleared. Fix the problem by
waiting on I_SYNC flags of an inode on b_more_io list in case we failed to
write anything.

Tested-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

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