tree 1939d07eeaf6b094877eecc5aee10c560b22d265
parent 9486ba442b00a6b227bfe0d66b0f4dbcd1a2ee91
author Jaegeuk Kim <jaegeuk@kernel.org> 1416616660 -0800
committer Jaegeuk Kim <jaegeuk@kernel.org> 1416808317 -0800

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>