diff options
| author | jiangyiwen <jiangyiwen@huawei.com> | 2015-10-22 09:02:43 +1100 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2015-10-22 09:02:43 +1100 |
| commit | 144e65db2db2a6bc4b0dd5f5ee77d5fc75848406 (patch) | |
| tree | d5b88a45462834e235ff887db296fdf8f4e87503 /fs | |
| parent | c068b03b787906eb9caff8783d1ed649859560e5 (diff) | |
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@huawei.com>
Reviewed-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ocfs2/aops.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c index f04914cc19a4..7f604727f487 100644 --- a/fs/ocfs2/aops.c +++ b/fs/ocfs2/aops.c @@ -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); } |