Re: [PATCH 17/18] lightnvm: allow to use full device path

["Javier González" <javier@javigon.com>]

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> On 14 Mar 2019, at 17.04, Igor Konopko <igor.j.konopko@intel.com> wrote:
> 
> This patch adds the possibility to provide full device path (like
> /dev/nvme0n1) when specifying device on top of which pblk instance
> should be created/removed.
> 
> This makes creation of targets from nvme-cli (or other ioctl based
> tools) more unified with other commands in comparison with current
> situation where almost all commands uses full device path with except
> of lightnvm creation/removal parameter which uses just 'nvme0n1'
> naming convention. After this changes both approach will be valid.
> 
> Signed-off-by: Igor Konopko <igor.j.konopko@intel.com>
> ---
> drivers/lightnvm/core.c | 23 ++++++++++++++++++-----
> 1 file changed, 18 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
> index c01f83b..838c3d8 100644
> --- a/drivers/lightnvm/core.c
> +++ b/drivers/lightnvm/core.c
> @@ -1195,6 +1195,21 @@ void nvm_unregister(struct nvm_dev *dev)
> }
> EXPORT_SYMBOL(nvm_unregister);
> 
> +#define PREFIX_STR "/dev/"
> +static void nvm_normalize_path(char *path)
> +{
> +	path[DISK_NAME_LEN - 1] = '\0';
> +	if (!memcmp(PREFIX_STR, path,
> +				sizeof(char) * strlen(PREFIX_STR))) {
> +		/*
> +		 * User provide name in '/dev/nvme0n1' format,
> +		 * so we need to skip '/dev/' for comparison
> +		 */
> +		memmove(path, path + sizeof(char) * strlen(PREFIX_STR),
> +			(DISK_NAME_LEN - strlen(PREFIX_STR)) * sizeof(char));
> +	}
> +}
> +
> static int __nvm_configure_create(struct nvm_ioctl_create *create)
> {
> 	struct nvm_dev *dev;
> @@ -1304,9 +1319,9 @@ static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
> 		return -EINVAL;
> 	}
> 
> -	create.dev[DISK_NAME_LEN - 1] = '\0';
> +	nvm_normalize_path(create.dev);
> +	nvm_normalize_path(create.tgtname);
> 	create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
> -	create.tgtname[DISK_NAME_LEN - 1] = '\0';
> 
> 	if (create.flags != 0) {
> 		__u32 flags = create.flags;
> @@ -1333,7 +1348,7 @@ static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
> 	if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove)))
> 		return -EFAULT;
> 
> -	remove.tgtname[DISK_NAME_LEN - 1] = '\0';
> +	nvm_normalize_path(remove.tgtname);
> 
> 	if (remove.flags != 0) {
> 		pr_err("nvm: no flags supported\n");
> @@ -1373,8 +1388,6 @@ static long nvm_ioctl_dev_factory(struct file *file, void __user *arg)
> 	if (copy_from_user(&fact, arg, sizeof(struct nvm_ioctl_dev_factory)))
> 		return -EFAULT;
> 
> -	fact.dev[DISK_NAME_LEN - 1] = '\0';
> -
> 	if (fact.flags & ~(NVM_FACTORY_NR_BITS - 1))
> 		return -EINVAL;
> 
> --
> 2.9.5

Looks good to me.

Reviewed-by: Javier González <javier@javigon.com>


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