On 2015/9/9 9:55, jiangyiwen wrote: > 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> Reviewed-by: Joseph Qi <joseph...@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); > } > > /* >
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