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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 <ryan.ding@oracle.com>
Acked-by: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Joseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ryan Ding 2016-03-25 14:21:23 -07:00 committed by Linus Torvalds
parent ce170828e2
commit 28888681b4
1 changed files with 8 additions and 4 deletions
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12
fs/ocfs2/aops.c
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@ -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);
}
/*