On 6/15/21 7:49 AM, Coly Li wrote:
> This patch adds a sysfs interface register_nvdimm_meta to register
> NVDIMM meta device. The sysfs interface file only shows up when
> CONFIG_BCACHE_NVM_PAGES=y. Then a NVDIMM name space formatted by
> bcache-tools can be registered into bcache by e.g.,
> echo /dev/pmem0 > /sys/fs/bcache/register_nvdimm_meta
>
> Signed-off-by: Coly Li <colyli@xxxxxxx>
> Cc: Jianpeng Ma <jianpeng.ma@xxxxxxxxx>
> Cc: Qiaowei Ren <qiaowei.ren@xxxxxxxxx>
> ---
> drivers/md/bcache/super.c | 29 +++++++++++++++++++++++++++++
> 1 file changed, 29 insertions(+)
>
> diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
> index 4d6666d03aa7..9d506d053548 100644
> --- a/drivers/md/bcache/super.c
> +++ b/drivers/md/bcache/super.c
> @@ -2439,10 +2439,18 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
> static ssize_t bch_pending_bdevs_cleanup(struct kobject *k,
> struct kobj_attribute *attr,
> const char *buffer, size_t size);
> +#if defined(CONFIG_BCACHE_NVM_PAGES)
> +static ssize_t register_nvdimm_meta(struct kobject *k,
> + struct kobj_attribute *attr,
> + const char *buffer, size_t size);
> +#endif
>
> kobj_attribute_write(register, register_bcache);
> kobj_attribute_write(register_quiet, register_bcache);
> kobj_attribute_write(pendings_cleanup, bch_pending_bdevs_cleanup);
> +#if defined(CONFIG_BCACHE_NVM_PAGES)
> +kobj_attribute_write(register_nvdimm_meta, register_nvdimm_meta);
> +#endif
>
> static bool bch_is_open_backing(dev_t dev)
> {
> @@ -2556,6 +2564,24 @@ static void register_device_async(struct async_reg_args *args)
> queue_delayed_work(system_wq, &args->reg_work, 10);
> }
>
> +#if defined(CONFIG_BCACHE_NVM_PAGES)
> +static ssize_t register_nvdimm_meta(struct kobject *k, struct kobj_attribute *attr,
> + const char *buffer, size_t size)
> +{
> + ssize_t ret = size;
> +
> + struct bch_nvm_namespace *ns = bch_register_namespace(buffer);
> +
> + if (IS_ERR(ns)) {
> + pr_err("register nvdimm namespace %s for meta device failed.\n",
> + buffer);
> + ret = -EINVAL;
> + }
> +
> + return ret;
> +}
> +#endif
> +
> static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
> const char *buffer, size_t size)
> {
> @@ -2898,6 +2924,9 @@ static int __init bcache_init(void)
> static const struct attribute *files[] = {
> &ksysfs_register.attr,
> &ksysfs_register_quiet.attr,
> +#if defined(CONFIG_BCACHE_NVM_PAGES)
> + &ksysfs_register_nvdimm_meta.attr,
> +#endif
> &ksysfs_pendings_cleanup.attr,
> NULL
> };
>
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>
Cheers,
Hannes
--
Dr. Hannes Reinecke Kernel Storage Architect
hare@xxxxxxx +49 911 74053 688
SUSE Software Solutions Germany GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), GF: Felix Imendörffer
