The patch titled
Subject: ocfs2: fill in the unused portion of the block with zeros by dio_zero_block()
has been added to the -mm tree. Its filename is
ocfs2-fill-in-the-unused-portion-of-the-block-with-zeros-by-dio_zero_block.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/ocfs2-fill-in-the-unused-portion-of-the-block-with-zeros-by-dio_zero_block.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/ocfs2-fill-in-the-unused-portion-of-the-block-with-zeros-by-dio_zero_block.patch
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------------------------------------------------------
From: jiangyiwen <jiangyiwen@xxxxxxxxxx>
Subject: ocfs2: fill in the unused portion of the block with zeros by dio_zero_block()
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 <jiangyiwen@xxxxxxxxxx>
Reviewed-by: Joseph Qi <joseph.qi@xxxxxxxxxx>
Cc: Mark Fasheh <mfasheh@xxxxxxx>
Cc: Joel Becker <jlbec@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ocfs2/aops.c | 1 +
1 file changed, 1 insertion(+)
diff -puN fs/ocfs2/aops.c~ocfs2-fill-in-the-unused-portion-of-the-block-with-zeros-by-dio_zero_block fs/ocfs2/aops.c
--- a/fs/ocfs2/aops.c~ocfs2-fill-in-the-unused-portion-of-the-block-with-zeros-by-dio_zero_block
+++ a/fs/ocfs2/aops.c
@@ -589,6 +589,7 @@ static int ocfs2_direct_IO_get_blocks(st
ret = -EIO;
goto bail;
}
+ set_buffer_new(bh_result);
up_write(&OCFS2_I(inode)->ip_alloc_sem);
}
_
Patches currently in -mm which might be from jiangyiwen@xxxxxxxxxx are
ocfs2-fill-in-the-unused-portion-of-the-block-with-zeros-by-dio_zero_block.patch
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