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f2fs: fix livelock calling f2fs_iget during f2fs_evict_inode

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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>
This commit is contained in:
Jaegeuk Kim
2014-11-21 16:37:40 -08:00
parent 9486ba442b
commit 0341845efc
1 changed files with 10 additions and 1 deletions
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11
fs/f2fs/segment.c
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@@ -230,7 +230,16 @@ void commit_inmem_pages(struct inode *inode, bool abort)
.rw = WRITE_SYNC,
};
f2fs_balance_fs(sbi);
/*
* The abort is true only when f2fs_evict_inode is called.
* Basically, the f2fs_evict_inode doesn't produce any data writes, so
* that we don't need to call f2fs_balance_fs.
* Otherwise, f2fs_gc in f2fs_balance_fs can wait forever until this
* inode becomes free by iget_locked in f2fs_iget.
*/
if (!abort)
f2fs_balance_fs(sbi);
f2fs_lock_op(sbi);
mutex_lock(&fi->inmem_lock);