[PATCH 14/14] bcache: add sysfs interface register_nvdimm_meta to register NVDIMM meta device
From: Coly Li <hidden>
Date: 2021-06-15 05:50:05
Also in:
linux-bcache
Subsystem:
bcache (block layer cache), the rest · Maintainers:
Coly Li, Kent Overstreet, Linus Torvalds
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 <redacted> Cc: Jianpeng Ma <redacted> Cc: Qiaowei Ren <redacted> --- 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 };
--
2.26.2