From a47726bcf299db6b5743d574df36c423263b4e65 Mon Sep 17 00:00:00 2001
From: Joseph Qi <joseph.qi@huawei.com>
Date: Tue, 14 Apr 2015 15:43:27 -0700
Subject: ocfs2: rollback the cleared bits if error occurs after
 ocfs2_block_group_clear_bits

ocfs2_block_group_clear_bits will clear bits in block group bitmap.
Once it succeeds but fails in the following step, it will cause block
group bitmap mismatch the corresponding count recorded in dinode.
So rollback the cleared bits if error occurs.

Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 fs/ocfs2/suballoc.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'fs/ocfs2')

diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c
index 0cb889a17ae1..4479029630bb 100644
--- a/fs/ocfs2/suballoc.c
+++ b/fs/ocfs2/suballoc.c
@@ -2499,6 +2499,8 @@ static int _ocfs2_free_suballoc_bits(handle_t *handle,
 					 alloc_bh, OCFS2_JOURNAL_ACCESS_WRITE);
 	if (status < 0) {
 		mlog_errno(status);
+		ocfs2_block_group_set_bits(handle, alloc_inode, group, group_bh,
+				start_bit, count);
 		goto bail;
 	}
 
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