From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Sat, 22 Nov 2014 00:37:40 +0000 (-0800)
Subject: f2fs: fix livelock calling f2fs_iget during f2fs_evict_inode
X-Git-Tag: omap-for-v3.20/drop-legacy-3517~143^2~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0341845efcb4a656707b6d551c3057d6dd27009f;p=pandora-kernel.git

f2fs: fix livelock calling f2fs_iget during f2fs_evict_inode

In f2fs_evict_inode,
 commit_inmemory_pages
   f2fs_gc
     f2fs_iget
       iget_locked
         -> wait for inode free

Here, if the inode is same as the one to be evicted, f2fs should wait forever.
Actually, we should not call f2fs_balance_fs during f2fs_evict_inode to avoid
this.

But, the commit_inmem_pages calls f2fs_balance_fs by default, even if
f2fs_evict_inode wants to free inmemory pages only.

Hence, this patch adds to trigger f2fs_balance_fs only when there is something
to write.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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