[PATCH 1/5] ext4: allocate delalloc blocks before changing journal mode

[Yongqiang Yang <xiaoqiangnk@gmail.com>]

delalloc blocks should be allocated before changing journal mode,
otherwise they can not be allocated and even more truncate on
delalloc blocks could triggre BUG by flushing delalloc buffers.

Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
---
 fs/ext4/inode.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index de05e86..384f8a7 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4676,6 +4676,17 @@ int ext4_change_inode_journal_flag(struct inode *inode, int val)
 		return 0;
 	if (is_journal_aborted(journal))
 		return -EROFS;
+	/* We have to allocate physical blocks for delalloc blocks
+	 * before flushing journal. otherwise delalloc blocks can not
+	 * be allocated any more. even more truncate on delalloc blocks
+	 * could trigger BUG by flushing delalloc blocks in journal.
+	 * There is no delalloc block in non-journal data mode.
+	 */
+	if (val && test_opt(inode->i_sb, DELALLOC)) {
+		err = ext4_alloc_da_blocks(inode);
+		if (err < 0)
+			return err;
+	}
 
 	jbd2_journal_lock_updates(journal);
 	jbd2_journal_flush(journal);
-- 
1.7.5.1