From 28888681b4f641ce9a96478ce4683577cd3abbff Mon Sep 17 00:00:00 2001 From: Ryan Ding Date: Fri, 25 Mar 2016 14:21:23 -0700 Subject: [PATCH] ocfs2: fix a deadlock issue in ocfs2_dio_end_io_write() The code should call ocfs2_free_alloc_context() to free meta_ac & data_ac before calling ocfs2_run_deallocs(). Because ocfs2_run_deallocs() will acquire the system inode's i_mutex hold by meta_ac. So try to release the lock before ocfs2_run_deallocs(). Fixes: af1310367f41 ("ocfs2: fix sparse file & data ordering issue in direct io.") Signed-off-by: Ryan Ding Acked-by: Junxiao Bi Cc: Joseph Qi Cc: Mark Fasheh Cc: Joel Becker Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/ocfs2/aops.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c index 328ac7f99d52..1581240a7ca0 100644 --- a/fs/ocfs2/aops.c +++ b/fs/ocfs2/aops.c @@ -2341,6 +2341,10 @@ static void ocfs2_dio_end_io_write(struct inode *inode, ret = ocfs2_lock_allocators(inode, &et, 0, dwc->dw_zero_count*2, &data_ac, &meta_ac); + if (ret) { + mlog_errno(ret); + goto unlock; + } credits = ocfs2_calc_extend_credits(inode->i_sb, &di->id2.i_list); @@ -2380,14 +2384,14 @@ unlock: ocfs2_inode_unlock(inode, 1); brelse(di_bh); out: - ocfs2_run_deallocs(osb, &dealloc); - if (locked) - mutex_unlock(&inode->i_mutex); - ocfs2_dio_free_write_ctx(inode, dwc); if (data_ac) ocfs2_free_alloc_context(data_ac); if (meta_ac) ocfs2_free_alloc_context(meta_ac); + ocfs2_run_deallocs(osb, &dealloc); + if (locked) + mutex_unlock(&inode->i_mutex); + ocfs2_dio_free_write_ctx(inode, dwc); } /*