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From: Coly Li <colyli@suse.de>
To: linux-bcache@vger.kernel.org
Cc: linux-block@vger.kernel.org, jianpeng.ma@intel.com,
	qiaowei.ren@intel.com, Coly Li <colyli@suse.de>
Subject: [PATCH 6/6] bcache: add sysfs interface register_nvdimm_meta to register NVDIMM meta device
Date: Sun,  7 Feb 2021 23:24:23 +0800
Message-ID: <20210207152423.70697-7-colyli@suse.de> (raw)
In-Reply-To: <20210207152423.70697-1-colyli@suse.de>

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@suse.de>
Cc: Jianpeng Ma <jianpeng.ma@intel.com>
Cc: Qiaowei Ren <qiaowei.ren@intel.com>
---
 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 262dae3ef030..7cbccc768468 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -2409,10 +2409,18 @@ 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);
+#ifdef 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);
+#ifdef CONFIG_BCACHE_NVM_PAGES
+kobj_attribute_write(register_nvdimm_meta, register_nvdimm_meta);
+#endif
 
 static bool bch_is_open_backing(dev_t dev)
 {
@@ -2526,6 +2534,24 @@ static void register_device_aync(struct async_reg_args *args)
 	queue_delayed_work(system_wq, &args->reg_work, 10);
 }
 
+#ifdef 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 size;
+}
+#endif
+
 static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
 			       const char *buffer, size_t size)
 {
@@ -2858,6 +2884,9 @@ static int __init bcache_init(void)
 	static const struct attribute *files[] = {
 		&ksysfs_register.attr,
 		&ksysfs_register_quiet.attr,
+#ifdef CONFIG_BCACHE_NVM_PAGES
+		&ksysfs_register_nvdimm_meta.attr,
+#endif
 		&ksysfs_pendings_cleanup.attr,
 		NULL
 	};
-- 
2.26.2


      parent reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-07 15:24 [PATCH 0/6] bcache: store bcache journal on NVDIMM pages Coly Li
2021-02-07 15:24 ` [PATCH 1/6] bcache: use bucket index for SET_GC_MARK() in bch_btree_gc_finish() Coly Li
2021-02-07 15:24 ` [PATCH 2/6] bcache: add BCH_FEATURE_INCOMPAT_NVDIMM_META into incompat feature set Coly Li
2021-02-07 15:24 ` [PATCH 3/6] bcache: initialize bcache journal for NVDIMM meta device Coly Li
2021-02-07 15:24 ` [PATCH 4/6] bcache: support storing bcache journal into " Coly Li
2021-02-07 15:24 ` [PATCH 5/6] bache: read jset from NVDIMM pages for journal replay Coly Li
2021-02-07 15:24 ` Coly Li [this message]

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