Commit 4e357b93 authored by jiangyiwen's avatar jiangyiwen Committed by Linus Torvalds

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: default avatarYiwen Jiang <jiangyiwen@huawei.com>
Reviewed-by: default avatarJoseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent d162eaad
......@@ -589,6 +589,7 @@ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
ret = -EIO;
goto bail;
}
set_buffer_new(bh_result);
up_write(&OCFS2_I(inode)->ip_alloc_sem);
}
......
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