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From: Coly Li <colyli@suse.de>
To: linux-bcache@vger.kernel.org
Cc: linux-block@vger.kernel.org, linux-nvdimm@lists.01.org,
	axboe@kernel.dk, jianpeng.ma@intel.com, qiaowei.ren@intel.com,
	hare@suse.com, jack@suse.cz, dan.j.williams@intel.com,
	Coly Li <colyli@suse.de>
Subject: [PATCH v7 13/16] bcache: add sysfs interface register_nvdimm_meta to register NVDIMM meta device
Date: Sat, 10 Apr 2021 00:43:40 +0800	[thread overview]
Message-ID: <20210409164343.56828-14-colyli@suse.de> (raw)
In-Reply-To: <20210409164343.56828-1-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 9640bfb85571..d95a9a3c2041 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -2436,10 +2436,18 @@ 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)
 {
@@ -2553,6 +2561,24 @@ static void register_device_async(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 ret;
+}
+#endif
+
 static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
 			       const char *buffer, size_t size)
 {
@@ -2888,6 +2914,9 @@ 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	other threads:[~2021-04-09 16:45 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-09 16:43 [PATCH v7 00/16] bcache: support NVDIMM for journaling Coly Li
2021-04-09 16:43 ` [PATCH v7 01/16] bcache: add initial data structures for nvm pages Coly Li
2021-04-09 16:43 ` [PATCH v7 02/16] bcache: initialize the nvm pages allocator Coly Li
2021-04-09 16:43 ` [PATCH v7 03/16] bcache: initialization of the buddy Coly Li
2021-04-09 16:43 ` [PATCH v7 04/16] bcache: bch_nvm_alloc_pages() " Coly Li
2021-04-09 16:43 ` [PATCH v7 05/16] bcache: bch_nvm_free_pages() " Coly Li
2021-04-09 16:43 ` [PATCH v7 06/16] bcache: get allocated pages from specific owner Coly Li
2021-04-09 16:43 ` [PATCH v7 07/16] bcache: nvm-pages fixes for bcache integration testing Coly Li
2021-04-09 16:43 ` [PATCH v7 08/16] bcache: use bucket index to set GC_MARK_METADATA for journal buckets in bch_btree_gc_finish() Coly Li
2021-04-09 16:43 ` [PATCH v7 09/16] bcache: add BCH_FEATURE_INCOMPAT_NVDIMM_META into incompat feature set Coly Li
2021-04-09 16:43 ` [PATCH v7 10/16] bcache: initialize bcache journal for NVDIMM meta device Coly Li
2021-04-09 16:43 ` [PATCH v7 11/16] bcache: support storing bcache journal into " Coly Li
2021-04-09 16:43 ` [PATCH v7 12/16] bcache: read jset from NVDIMM pages for journal replay Coly Li
2021-04-09 16:43 ` Coly Li [this message]
2021-04-09 16:43 ` [PATCH v7 14/16] bcache: use div_u64() in init_owner_info() Coly Li
2021-04-09 16:43 ` [PATCH v7 15/16] bcache: fix BCACHE_NVM_PAGES' dependences in Kconfig Coly Li
2021-04-09 16:43 ` [PATCH v7 16/16] bcache: more fix for compiling error when BCACHE_NVM_PAGES disabled Coly Li

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