linux-kernel - Re: [PATCH] raid-1/10: fix RW bits manipulation

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Date:	Wed, 23 Sep 2009 18:24:21 +1000
From:	Neil Brown <neilb@...e.de>
To:	Dmitry Monakhov <rjevskiy@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] raid-1/10: fix RW bits manipulation

On Sunday September 20, rjevskiy@...il.com wrote:
> Recently Jens has changed bio_rw_flagged() logic by following
> commit 1f98a13f623e0ef666690a18c1250335fc6d7ef1. Now it returns
> bool instead of int. This broke raid1/raid10 RW bits manipulation logic.
> One of visible result is BUG_ON triggering due to empty barrier
> here scsi_lib.c:1108 scsi_setup_fs_cmnd()

Thanks for this.  It looks good.  I will forward it to Linus shortly.

NeilBrown


> 
> Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
> ---
>  drivers/md/raid1.c  |   10 ++++++----
>  drivers/md/raid10.c |    6 +++---
>  2 files changed, 9 insertions(+), 7 deletions(-)
> diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
> index ff7ed33..5de48e5 100644
> --- a/drivers/md/raid1.c
> +++ b/drivers/md/raid1.c
> @@ -851,7 +851,7 @@ static int make_request(struct request_queue *q, struct bio * bio)
>  		read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset;
>  		read_bio->bi_bdev = mirror->rdev->bdev;
>  		read_bio->bi_end_io = raid1_end_read_request;
> -		read_bio->bi_rw = READ | do_sync;
> +		read_bio->bi_rw = READ | (do_sync << BIO_RW_SYNCIO);
>  		read_bio->bi_private = r1_bio;
>  
>  		generic_make_request(read_bio);
> @@ -943,7 +943,8 @@ static int make_request(struct request_queue *q, struct bio * bio)
>  		mbio->bi_sector	= r1_bio->sector + conf->mirrors[i].rdev->data_offset;
>  		mbio->bi_bdev = conf->mirrors[i].rdev->bdev;
>  		mbio->bi_end_io	= raid1_end_write_request;
> -		mbio->bi_rw = WRITE | do_barriers | do_sync;
> +		mbio->bi_rw = WRITE | (do_barriers << BIO_RW_BARRIER) |
> +			(do_sync << BIO_RW_SYNCIO);
>  		mbio->bi_private = r1_bio;
>  
>  		if (behind_pages) {
> @@ -1623,7 +1624,8 @@ static void raid1d(mddev_t *mddev)
>  						conf->mirrors[i].rdev->data_offset;
>  					bio->bi_bdev = conf->mirrors[i].rdev->bdev;
>  					bio->bi_end_io = raid1_end_write_request;
> -					bio->bi_rw = WRITE | do_sync;
> +					bio->bi_rw = WRITE |
> +						(do_sync << BIO_RW_SYNCIO);
>  					bio->bi_private = r1_bio;
>  					r1_bio->bios[i] = bio;
>  					generic_make_request(bio);
> @@ -1672,7 +1674,7 @@ static void raid1d(mddev_t *mddev)
>  				bio->bi_sector = r1_bio->sector + rdev->data_offset;
>  				bio->bi_bdev = rdev->bdev;
>  				bio->bi_end_io = raid1_end_read_request;
> -				bio->bi_rw = READ | do_sync;
> +				bio->bi_rw = READ | (do_sync << BIO_RW_SYNCIO);
>  				bio->bi_private = r1_bio;
>  				unplug = 1;
>  				generic_make_request(bio);
> diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
> index d0a2152..f2c891f 100644
> --- a/drivers/md/raid10.c
> +++ b/drivers/md/raid10.c
> @@ -882,7 +882,7 @@ static int make_request(struct request_queue *q, struct bio * bio)
>  			mirror->rdev->data_offset;
>  		read_bio->bi_bdev = mirror->rdev->bdev;
>  		read_bio->bi_end_io = raid10_end_read_request;
> -		read_bio->bi_rw = READ | do_sync;
> +		read_bio->bi_rw = READ | (do_sync << BIO_RW_SYNCIO);
>  		read_bio->bi_private = r10_bio;
>  
>  		generic_make_request(read_bio);
> @@ -950,7 +950,7 @@ static int make_request(struct request_queue *q, struct bio * bio)
>  			conf->mirrors[d].rdev->data_offset;
>  		mbio->bi_bdev = conf->mirrors[d].rdev->bdev;
>  		mbio->bi_end_io	= raid10_end_write_request;
> -		mbio->bi_rw = WRITE | do_sync;
> +		mbio->bi_rw = WRITE | (do_sync << BIO_RW_SYNCIO);
>  		mbio->bi_private = r10_bio;
>  
>  		atomic_inc(&r10_bio->remaining);
> @@ -1623,7 +1623,7 @@ static void raid10d(mddev_t *mddev)
>  				bio->bi_sector = r10_bio->devs[r10_bio->read_slot].addr
>  					+ rdev->data_offset;
>  				bio->bi_bdev = rdev->bdev;
> -				bio->bi_rw = READ | do_sync;
> +				bio->bi_rw = READ | (do_sync << BIO_RW_SYNCIO);
>  				bio->bi_private = r10_bio;
>  				bio->bi_end_io = raid10_end_read_request;
>  				unplug = 1;
> -- 
> 1.6.2.2.446.gfbdc0
> 
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