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| author | jiangyiwen <jiangyiwen@huawei.com> | 2015-11-05 18:43:55 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-05 19:34:48 -0800 |
| commit | 4e357b932a665e62eb0642633057b8d7156ed8db (patch) | |
| tree | 3c07cabd793ff81d1cb5cd872fc6ce0387580665 /fs/ocfs2 | |
| parent | d162eaad7726e5f10a2b5813bdfac9d55c8eba69 (diff) | |
| download | linux-4e357b932a665e62eb0642633057b8d7156ed8db.tar.gz linux-4e357b932a665e62eb0642633057b8d7156ed8db.tar.bz2 linux-4e357b932a665e62eb0642633057b8d7156ed8db.zip | |
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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ocfs2')
| -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); } |