Commit c15e8599 authored Aug 07, 2015 by Chao Yu Committed by Jaegeuk Kim Aug 11, 2015

f2fs: report EINVAL for unalignment direct IO



We run ltp testcase with f2fs and obtain a TFAIL in diotest4, the result in
detail is as fallow:

dio04

<<<test_start>>>
tag=dio04 stime=1432278894
cmdline="diotest4"
contacts=""
analysis=exit
<<<test_output>>>
diotest4    1  TPASS  :  Negative Offset
diotest4    2  TPASS  :  removed
diotest4    3  TFAIL  :  diotest4.c:129: write allows odd count.returns 1: Success
diotest4    4  TFAIL  :  diotest4.c:183: Odd count of read and write
diotest4    5  TPASS  :  Read beyond the file size
......

the result of ext4 with same environment:

dio04

<<<test_start>>>
tag=dio04 stime=1432259643
cmdline="diotest4"
contacts=""
analysis=exit
<<<test_output>>>
diotest4    1  TPASS  :  Negative Offset
diotest4    2  TPASS  :  removed
diotest4    3  TPASS  :  Odd count of read and write
diotest4    4  TPASS  :  Read beyond the file size
......

The reason is that when triggering DIO in f2fs, we will return zero value
in ->direct_IO if writer's buffer offset, file offset and transfer size is
not alignment to block size of filesystem, resulting in falling back into
buffered write instead of returning -EINVAL.

This patch fixes that problem by returning correct error number for above
case, and removing the judgement condition in check_direct_IO to make sure
the verification will be enabled for direct reader too.

Besides, Jaegeuk Kim pointed out that there is expectional cases we should
always make direct-io falling back into buffered write, such as dio in
encrypted file.

Signed-off-by: Yunlei He <heyunlei@huawei.com>
[Chao Yu make small change and add detail description in commit message]
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

parent 6394328a

fs/f2fs/data.c

+3 −5

Original line number	Diff line number	Diff line
		@@ -1494,9 +1494,6 @@ static int check_direct_IO(struct inode inode, struct iov_iter iter,
		{
		unsigned blocksize_mask = inode->i_sb->s_blocksize - 1;

		if (iov_iter_rw(iter) == READ)
		return 0;

		if (offset & blocksize_mask)
		return -EINVAL;

		@@ -1525,8 +1522,9 @@ static ssize_t f2fs_direct_IO(struct kiocb iocb, struct iov_iter iter,
		if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode))
		return 0;

		if (check_direct_IO(inode, iter, offset))
		return 0;
		err = check_direct_IO(inode, iter, offset);
		if (err)
		return err;

		trace_f2fs_direct_IO_enter(inode, offset, count, iov_iter_rw(iter));