On 2012-07-17 11:04 NeilBrown <neilb@xxxxxxx> Wrote:
>On Mon, 16 Jul 2012 14:22:03 +0800 majianpeng <majianpeng@xxxxxxxxx> wrote:
>
>> For regular file, write operaion used blk_plug function.But for block
>> file,write operation did not use blk_plug.
>> This patch is also for write-cache mode for block-device.
>>
>> Signed-off-by: Jianpeng Ma <majianpeng@xxxxxxxxx>
>
>Reviewed-by: NeilBrown <neilb@xxxxxxx>
>
>Will you take this Jens? Though mail to you seem to be bouncing:
>
><axboe@xxxxxxxxxxxx>: host mail.fusionio.com[10.101.1.19] said: 554 5.4.6 Hop
> count exceeded - possible mail loop (in reply to end of DATA command)
>
>so I'm not sure you'll even see this :-(
>
I see it.
>NeilBrown
>
>> ---
>> fs/block_dev.c | 3 +++
>> 1 files changed, 3 insertions(+), 0 deletions(-)
>>
>> diff --git a/fs/block_dev.c b/fs/block_dev.c
>> index c2bbe1f..cf10778 100644
>> --- a/fs/block_dev.c
>> +++ b/fs/block_dev.c
>> @@ -1579,9 +1579,11 @@ ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
>> {
>> struct file *file = iocb->ki_filp;
>> ssize_t ret;
>> + struct blk_plug plug;
>>
>> BUG_ON(iocb->ki_pos != pos);
>>
>> + blk_start_plug(&plug);
>> ret = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos);
>> if (ret > 0 || ret == -EIOCBQUEUED) {
>> ssize_t err;
>> @@ -1590,6 +1592,7 @@ ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
>> if (err < 0 && ret > 0)
>> ret = err;
>> }
>> + blk_finish_plug(&plug);
>> return ret;
>> }
>> EXPORT_SYMBOL_GPL(blkdev_aio_write);
>
>?韬{.n?????%??檩??w?{.n???{饼?z鳐??骅w* jg????????G??⒏ ⒎?:+v???????? ????＂??????
