linux-kernel - Re: [PATCHv2 1/2] target: make target db location configurable

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Message-ID: <570F3458.8010109@suse.de>
Date:	Thu, 14 Apr 2016 08:10:32 +0200
From:	Hannes Reinecke <hare@...e.de>
To:	Lee Duncan <lduncan@...e.com>, linux-scsi@...r.kernel.org,
	nab@...ux-iscsi.org, target-devel@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hch@...radead.org,
	agrover@...hat.com, jxm@...iant.com
Subject: Re: [PATCHv2 1/2] target: make target db location configurable

On 04/13/2016 10:25 PM, Lee Duncan wrote:
> This commit adds the read-write attribute "dbroot",
> in the top-level CONFIGFS (core) target directory,
> normally /sys/kernel/config/target. This attribute
> defaults to "/var/target" but can be changed by
> writing a new pathname string to it. Changing this
> attribute is only allowed when no fabric drivers
> are loaded and the supplied value specifies an
> existing directory.
> 
> Target modules that care about the target database
> root directory will be modified to use this
> attribute in a future commit.
> 
> Signed-off-by: Lee Duncan <lduncan@...e.com>
> ---
>  drivers/target/target_core_configfs.c | 51 +++++++++++++++++++++++++++++++++++
>  drivers/target/target_core_internal.h |  6 +++++
>  2 files changed, 57 insertions(+)
> 
> diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
> index 713c63d9681b..bfedbd92b77f 100644
> --- a/drivers/target/target_core_configfs.c
> +++ b/drivers/target/target_core_configfs.c
> @@ -99,6 +99,56 @@ static ssize_t target_core_item_version_show(struct config_item *item,
>  
>  CONFIGFS_ATTR_RO(target_core_item_, version);
>  
> +char db_root[DB_ROOT_LEN] = DB_ROOT_DEFAULT;
> +static char db_root_stage[DB_ROOT_LEN];
> +
> +static ssize_t target_core_item_dbroot_show(struct config_item *item,
> +					    char *page)
> +{
> +	return sprintf(page, "%s\n", db_root);
> +}
> +
> +static ssize_t target_core_item_dbroot_store(struct config_item *item,
> +					const char *page, size_t count)
> +{
> +	ssize_t read_bytes;
> +	struct file *fp;
> +
> +	if (!list_empty(&g_tf_list)) {
> +		pr_err("db_root: cannot be changed: target drivers registered");
> +		return -EINVAL;
> +	}
Locking?

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare@...e.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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