Re: [PATCH v2 3/7] multipathd: remove coalesce_paths from ev_add_map

[Martin Wilck <mwilck@suse.com>]

On Thu, 2018-02-08 at 17:56 -0600, Benjamin Marzinski wrote:
> If ev_add_map is called for a multipath device that doesn't exist in
> device-mapper, it will call coalesce_paths to add it.  This doesn't
> work
> and hasn't for years. It doesn't add the map to the mpvec, or start
> up
> waiters, or do any of the necessary things that do get done when you
> call ev_add_map for a map that does exist in device mapper.
> 
> Fortunately, there are only two things that call ev_add_map.
> uev_add_map
> makes sure that the device does exist in device-mapper before calling
> ev_add_map, and cli_add_map creates the device first and then calls
> ev_add_map, if the device doesn't exist.
> 
> So, there is no reason for coalesce_paths to be in ev_add_map. This
> removes it.
> 
> Cc: Martin Wilck <mwilck@suse.com>
> Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>


Reviewed-by: Martin Wilck <mwilck@suse.com>


> ---
>  multipathd/main.c | 46 ++++++++++++++-------------------------------
> -
>  1 file changed, 14 insertions(+), 32 deletions(-)
> 
> diff --git a/multipathd/main.c b/multipathd/main.c
> index 27cf234..dbf9890 100644
> --- a/multipathd/main.c
> +++ b/multipathd/main.c
> @@ -412,18 +412,19 @@ uev_add_map (struct uevent * uev, struct
> vectors * vecs)
>  	return rc;
>  }
>  
> +/*
> + * ev_add_map expects that the multipath device already exists in
> kernel
> + * before it is called. It just adds a device to multipathd or
> updates an
> + * existing device.
> + */
>  int
>  ev_add_map (char * dev, char * alias, struct vectors * vecs)
>  {
> -	char * refwwid;
>  	struct multipath * mpp;
> -	int map_present;
> -	int r = 1, delayed_reconfig, reassign_maps;
> +	int delayed_reconfig, reassign_maps;
>  	struct config *conf;
>  
> -	map_present = dm_map_present(alias);
> -
> -	if (map_present && !dm_is_mpath(alias)) {
> +	if (!dm_is_mpath(alias)) {
>  		condlog(4, "%s: not a multipath map", alias);
>  		return 0;
>  	}
> @@ -468,33 +469,14 @@ ev_add_map (char * dev, char * alias, struct
> vectors * vecs)
>  	/*
>  	 * now we can register the map
>  	 */
> -	if (map_present) {
> -		if ((mpp = add_map_without_path(vecs, alias))) {
> -			sync_map_state(mpp);
> -			condlog(2, "%s: devmap %s registered",
> alias, dev);
> -			return 0;
> -		} else {
> -			condlog(2, "%s: uev_add_map failed", dev);
> -			return 1;
> -		}
> -	}
> -	r = get_refwwid(CMD_NONE, dev, DEV_DEVMAP, vecs->pathvec,
> &refwwid);
> -
> -	if (refwwid) {
> -		r = coalesce_paths(vecs, NULL, refwwid,
> FORCE_RELOAD_NONE,
> -				   CMD_NONE);
> -		dm_lib_release();
> +	if ((mpp = add_map_without_path(vecs, alias))) {
> +		sync_map_state(mpp);
> +		condlog(2, "%s: devmap %s registered", alias, dev);
> +		return 0;
> +	} else {
> +		condlog(2, "%s: ev_add_map failed", dev);
> +		return 1;
>  	}
> -
> -	if (!r)
> -		condlog(2, "%s: devmap %s added", alias, dev);
> -	else if (r == 2)
> -		condlog(2, "%s: uev_add_map %s blacklisted", alias,
> dev);
> -	else
> -		condlog(0, "%s: uev_add_map %s failed", alias, dev);
> -
> -	FREE(refwwid);
> -	return r;
>  }
>  
>  static int

-- 
Dr. Martin Wilck <mwilck@suse.com>, Tel. +49 (0)911 74053 2107
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)

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