linux-kernel - Re: [PATCH] lightnvm: remove targets when corresponding nvm device exit

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Message-ID: <5654B195.4050406@lightnvm.io>
Date:	Tue, 24 Nov 2015 19:51:01 +0100
From:	Matias <mb@...htnvm.io>
To:	Wenwei Tao <ww.tao0320@...il.com>
CC:	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH] lightnvm: remove targets when corresponding nvm device
 exit

On 11/24/2015 05:03 PM, Wenwei Tao wrote:
> the target should be unreachable when underlying device was gone.
>
> Signed-off-by: Wenwei Tao <ww.tao0320@...il.com>
> ---
>   drivers/lightnvm/core.c | 12 ++++++++++--
>   1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
> index f659e60..b95c6c4 100644
> --- a/drivers/lightnvm/core.c
> +++ b/drivers/lightnvm/core.c
> @@ -278,10 +278,18 @@ err:
>   	return ret;
>   }
>
> +static void nvm_remove_target(struct nvm_target *t);
> +

You can move the hole declaration up here.

>   static void nvm_exit(struct nvm_dev *dev)
>   {
> +	struct nvm_target *t, *n;
> +
>   	if (dev->ppalist_pool)
>   		dev->ops->destroy_dma_pool(dev->ppalist_pool);
> +	down_write(&nvm_lock);
> +	list_for_each_entry_safe(t, n, &dev->online_targets, list)
> +		nvm_remove_target(t);
> +	up_write(&nvm_lock);

list_for_each_entry_safe should be enough here.

Actually, we should properly block any creations of new targets when 
nvm_exit is called. To prevent new ones to be created while we clean up.

Let me know if you want to submit a patch for this. Else I'll just apply 
this one with the suggested changes. Thanks Tao.

>   	nvm_free(dev);
>
>   	pr_info("nvm: successfully unloaded\n");
> @@ -496,13 +504,13 @@ static int __nvm_configure_create(struct nvm_ioctl_create *create)
>
>   static int __nvm_configure_remove(struct nvm_ioctl_remove *remove)
>   {
> -	struct nvm_target *t = NULL;
> +	struct nvm_target *n, *t = NULL;
>   	struct nvm_dev *dev;
>   	int ret = -1;
>
>   	down_write(&nvm_lock);
>   	list_for_each_entry(dev, &nvm_devices, devices)
> -		list_for_each_entry(t, &dev->online_targets, list) {
> +		list_for_each_entry_safe(t, n, &dev->online_targets, list) {
>   			if (!strcmp(remove->tgtname, t->disk->disk_name)) {
>   				nvm_remove_target(t);
>   				ret = 0;
>
--
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