A simplified test case is (this case from Ryan):
1) dd if=/dev/zero of=/mnt/hello bs=512 count=1 oflag=direct;
2) truncate /mnt/hello -s 2097152
file 'hello' is not exist before test. After this command,
file 'hello' should be all zero. But 512~4096 is some random data.
Setting bh state to new when get a new block, if so,
direct_io_worker()->dio_zero_block() will fill-in the unused portion
of the block with zero.
Signed-off-by: Yiwen Jiang <jiangyi...@huawei.com>
---
fs/ocfs2/aops.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 1a35c61..bd106b9 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -581,6 +581,7 @@ static int ocfs2_direct_IO_get_blocks(struct inode *inode,
sector_t iblock,
ret = -EIO;
goto bail;
}
+ set_buffer_new(bh_result);
}
/*
--
1.8.3.4
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