On 4/10/19 11:28 PM, Jason Yan wrote:
> If the last bio returned is not dio->bio, the status of the bio will
> not assigned to dio->bio if it is error. This will cause the whole IO
> status wrong.
>
> ksoftirqd/21-117 [021] ..s. 4017.966090: 8,0 C N 4883648 [0]
> <idle>-0 [018] ..s. 4017.970888: 8,0 C WS 4924800 + 1024 [0]
> <idle>-0 [018] ..s. 4017.970909: 8,0 D WS 4935424 + 1024 [<idle>]
> <idle>-0 [018] ..s. 4017.970924: 8,0 D WS 4936448 + 321 [<idle>]
> ksoftirqd/21-117 [021] ..s. 4017.995033: 8,0 C R 4883648 + 336 [65475]
> ksoftirqd/21-117 [021] d.s. 4018.001988: myprobe1: (blkdev_bio_end_io+0x0/0x168) bi_status=7
> ksoftirqd/21-117 [021] d.s. 4018.001992: myprobe: (aio_complete_rw+0x0/0x148) x0=0xffff802f2595ad80 res=0x12a000 res2=0x0
>
> We always have to assign bio->bi_status to dio->bio.bi_status because we
> will only check dio->bio.bi_status when we return the whole IO to
> the upper layer.
>
> Fixes: 542ff7bf18c6 ("block: new direct I/O implementation")
> Cc: Christoph Hellwig <hch@xxxxxx>
> Cc: Jens Axboe <axboe@xxxxxxxxx>
> Cc: Ming Lei <ming.lei@xxxxxxxxxx>
> Signed-off-by: Jason Yan <yanaijie@xxxxxxxxxx>
> ---
> fs/block_dev.c | 16 ++++++++--------
> 1 file changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/fs/block_dev.c b/fs/block_dev.c
> index 78d3257435c0..0fead5520a7e 100644
> --- a/fs/block_dev.c
> +++ b/fs/block_dev.c
> @@ -84,7 +84,7 @@ void kill_bdev(struct block_device *bdev)
>
> invalidate_bh_lrus();
> truncate_inode_pages(mapping, 0);
> -}
> +}
Didn't understand above change, is it possible to get rid of above line
change ?
> EXPORT_SYMBOL(kill_bdev);
>
> /* Invalidate clean unused buffers and pagecache. */
> @@ -307,10 +307,10 @@ static void blkdev_bio_end_io(struct bio *bio)
> struct blkdev_dio *dio = bio->bi_private;
> bool should_dirty = dio->should_dirty;
>
> - if (dio->multi_bio && !atomic_dec_and_test(&dio->ref)) {
> - if (bio->bi_status && !dio->bio.bi_status)
> - dio->bio.bi_status = bio->bi_status;
> - } else {
> + if (bio->bi_status && !dio->bio.bi_status)
> + dio->bio.bi_status = bio->bi_status;
> +
> + if (!dio->multi_bio || atomic_dec_and_test(&dio->ref)) {
> if (!dio->is_sync) {
> struct kiocb *iocb = dio->iocb;
> ssize_t ret;
> @@ -670,13 +670,13 @@ static loff_t block_llseek(struct file *file, loff_t offset, int whence)
> inode_unlock(bd_inode);
> return retval;
> }
> -
> +
Same here.
> int blkdev_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
> {
> struct inode *bd_inode = bdev_file_inode(filp);
> struct block_device *bdev = I_BDEV(bd_inode);
> int error;
> -
> +
Same here.
> error = file_write_and_wait_range(filp, start, end);
> if (error)
> return error;
> @@ -983,7 +983,7 @@ void bdput(struct block_device *bdev)
> }
>
> EXPORT_SYMBOL(bdput);
> -
> +
Same here.
> static struct block_device *bd_acquire(struct inode *inode)
> {
> struct block_device *bdev;
>
