linux-kernel - Re: [PATCH] drivers: md: Unify common definitions of raid1 and raid10

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Date:   Thu, 16 May 2019 08:23:19 -0300
From:   Marcos Paulo de Souza <marcos.souza.org@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     neilb@...e.com, Shaohua Li <shli@...nel.org>,
        "open list:SOFTWARE RAID (Multiple Disks) SUPPORT" 
        <linux-raid@...r.kernel.org>
Subject: Re: [PATCH] drivers: md: Unify common definitions of raid1 and raid10

ping.

On Thu, May 09, 2019 at 08:18:49AM -0300, Marcos Paulo de Souza wrote:
> These definitions are being moved to raid1-10.c.
> 
> Signed-off-by: Marcos Paulo de Souza <marcos.souza.org@...il.com>
> ---
>  drivers/md/raid1-10.c | 25 +++++++++++++++++++++++++
>  drivers/md/raid1.c    | 29 ++---------------------------
>  drivers/md/raid10.c   | 27 +--------------------------
>  3 files changed, 28 insertions(+), 53 deletions(-)
> 
> diff --git a/drivers/md/raid1-10.c b/drivers/md/raid1-10.c
> index 400001b815db..7d968bf08e54 100644
> --- a/drivers/md/raid1-10.c
> +++ b/drivers/md/raid1-10.c
> @@ -3,6 +3,31 @@
>  #define RESYNC_BLOCK_SIZE (64*1024)
>  #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE)
>  
> +/*
> + * Number of guaranteed raid bios in case of extreme VM load:
> + */
> +#define	NR_RAID_BIOS 256
> +
> +/* when we get a read error on a read-only array, we redirect to another
> + * device without failing the first device, or trying to over-write to
> + * correct the read error.  To keep track of bad blocks on a per-bio
> + * level, we store IO_BLOCKED in the appropriate 'bios' pointer
> + */
> +#define IO_BLOCKED ((struct bio *)1)
> +/* When we successfully write to a known bad-block, we need to remove the
> + * bad-block marking which must be done from process context.  So we record
> + * the success by setting devs[n].bio to IO_MADE_GOOD
> + */
> +#define IO_MADE_GOOD ((struct bio *)2)
> +
> +#define BIO_SPECIAL(bio) ((unsigned long)bio <= 2)
> +
> +/* When there are this many requests queue to be written by
> + * the raid thread, we become 'congested' to provide back-pressure
> + * for writeback.
> + */
> +static int max_queued_requests = 1024;
> +
>  /* for managing resync I/O pages */
>  struct resync_pages {
>  	void		*raid_bio;
> diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
> index 0c8a098d220e..bb052c35bf29 100644
> --- a/drivers/md/raid1.c
> +++ b/drivers/md/raid1.c
> @@ -50,31 +50,6 @@
>  	 (1L << MD_HAS_PPL) |		\
>  	 (1L << MD_HAS_MULTIPLE_PPLS))
>  
> -/*
> - * Number of guaranteed r1bios in case of extreme VM load:
> - */
> -#define	NR_RAID1_BIOS 256
> -
> -/* when we get a read error on a read-only array, we redirect to another
> - * device without failing the first device, or trying to over-write to
> - * correct the read error.  To keep track of bad blocks on a per-bio
> - * level, we store IO_BLOCKED in the appropriate 'bios' pointer
> - */
> -#define IO_BLOCKED ((struct bio *)1)
> -/* When we successfully write to a known bad-block, we need to remove the
> - * bad-block marking which must be done from process context.  So we record
> - * the success by setting devs[n].bio to IO_MADE_GOOD
> - */
> -#define IO_MADE_GOOD ((struct bio *)2)
> -
> -#define BIO_SPECIAL(bio) ((unsigned long)bio <= 2)
> -
> -/* When there are this many requests queue to be written by
> - * the raid1 thread, we become 'congested' to provide back-pressure
> - * for writeback.
> - */
> -static int max_queued_requests = 1024;
> -
>  static void allow_barrier(struct r1conf *conf, sector_t sector_nr);
>  static void lower_barrier(struct r1conf *conf, sector_t sector_nr);
>  
> @@ -2955,7 +2930,7 @@ static struct r1conf *setup_conf(struct mddev *mddev)
>  	if (!conf->poolinfo)
>  		goto abort;
>  	conf->poolinfo->raid_disks = mddev->raid_disks * 2;
> -	err = mempool_init(&conf->r1bio_pool, NR_RAID1_BIOS, r1bio_pool_alloc,
> +	err = mempool_init(&conf->r1bio_pool, NR_RAID_BIOS, r1bio_pool_alloc,
>  			   r1bio_pool_free, conf->poolinfo);
>  	if (err)
>  		goto abort;
> @@ -3240,7 +3215,7 @@ static int raid1_reshape(struct mddev *mddev)
>  	newpoolinfo->mddev = mddev;
>  	newpoolinfo->raid_disks = raid_disks * 2;
>  
> -	ret = mempool_init(&newpool, NR_RAID1_BIOS, r1bio_pool_alloc,
> +	ret = mempool_init(&newpool, NR_RAID_BIOS, r1bio_pool_alloc,
>  			   r1bio_pool_free, newpoolinfo);
>  	if (ret) {
>  		kfree(newpoolinfo);
> diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
> index 3b6880dd648d..24cb116d950f 100644
> --- a/drivers/md/raid10.c
> +++ b/drivers/md/raid10.c
> @@ -73,31 +73,6 @@
>   *    [B A] [D C]    [B A] [E C D]
>   */
>  
> -/*
> - * Number of guaranteed r10bios in case of extreme VM load:
> - */
> -#define	NR_RAID10_BIOS 256
> -
> -/* when we get a read error on a read-only array, we redirect to another
> - * device without failing the first device, or trying to over-write to
> - * correct the read error.  To keep track of bad blocks on a per-bio
> - * level, we store IO_BLOCKED in the appropriate 'bios' pointer
> - */
> -#define IO_BLOCKED ((struct bio *)1)
> -/* When we successfully write to a known bad-block, we need to remove the
> - * bad-block marking which must be done from process context.  So we record
> - * the success by setting devs[n].bio to IO_MADE_GOOD
> - */
> -#define IO_MADE_GOOD ((struct bio *)2)
> -
> -#define BIO_SPECIAL(bio) ((unsigned long)bio <= 2)
> -
> -/* When there are this many requests queued to be written by
> - * the raid10 thread, we become 'congested' to provide back-pressure
> - * for writeback.
> - */
> -static int max_queued_requests = 1024;
> -
>  static void allow_barrier(struct r10conf *conf);
>  static void lower_barrier(struct r10conf *conf);
>  static int _enough(struct r10conf *conf, int previous, int ignore);
> @@ -3684,7 +3659,7 @@ static struct r10conf *setup_conf(struct mddev *mddev)
>  
>  	conf->geo = geo;
>  	conf->copies = copies;
> -	err = mempool_init(&conf->r10bio_pool, NR_RAID10_BIOS, r10bio_pool_alloc,
> +	err = mempool_init(&conf->r10bio_pool, NR_RAID_BIOS, r10bio_pool_alloc,
>  			   r10bio_pool_free, conf);
>  	if (err)
>  		goto out;
> -- 
> 2.21.0
> 

-- 
Thanks,
Marcos