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From: Coly Li <colyli@suse.de>
To: axboe@kernel.dk
Cc: linux-bcache@vger.kernel.org, linux-block@vger.kernel.org,
	Coly Li <colyli@suse.de>, Jianpeng Ma <jianpeng.ma@intel.com>,
	Qiaowei Ren <qiaowei.ren@intel.com>
Subject: [PATCH 19/20] bcache: add sysfs interface register_nvdimm_meta to register NVDIMM meta device
Date: Wed, 10 Feb 2021 13:07:41 +0800
Message-ID: <20210210050742.31237-20-colyli@suse.de> (raw)
In-Reply-To: <20210210050742.31237-1-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 57c96c16ee16..61fd5802a627 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -2415,10 +2415,18 @@ 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)
 {
@@ -2532,6 +2540,24 @@ 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 size;
+}
+#endif
+
 static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
 			       const char *buffer, size_t size)
 {
@@ -2867,6 +2893,9 @@ 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: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-10  5:07 [PATCH 00/20] bcache patches for Linux v5.12 Coly Li
2021-02-10  5:07 ` [PATCH 01/20] bcache: consider the fragmentation when update the writeback rate Coly Li
2021-02-10  5:07 ` [PATCH 02/20] bcache: Fix register_device_aync typo Coly Li
2021-02-10  5:07 ` [PATCH 03/20] Revert "bcache: Kill btree_io_wq" Coly Li
2021-02-10  5:07 ` [PATCH 04/20] bcache: Give btree_io_wq correct semantics again Coly Li
2021-02-10  5:07 ` [PATCH 05/20] bcache: Move journal work to new flush wq Coly Li
2021-02-10  5:07 ` [PATCH 06/20] bcache: Avoid comma separated statements Coly Li
2021-02-10  5:07 ` [PATCH 07/20] bcache: add initial data structures for nvm pages Coly Li
2021-02-10 15:09   ` Jens Axboe
2021-02-11  3:58     ` Coly Li
2021-02-10  5:07 ` [PATCH 08/20] bcache: initialize the nvm pages allocator Coly Li
2021-02-10  5:07 ` [PATCH 09/20] bcache: initialization of the buddy Coly Li
2021-02-10  5:07 ` [PATCH 10/20] bcache: bch_nvm_alloc_pages() " Coly Li
2021-02-10  5:07 ` [PATCH 11/20] bcache: bch_nvm_free_pages() " Coly Li
2021-02-10  5:07 ` [PATCH 12/20] bcache: get allocated pages from specific owner Coly Li
2021-02-10  5:07 ` [PATCH 13/20] bcache: persist owner info when alloc/free pages Coly Li
2021-02-10  5:07 ` [PATCH 14/20] bcache: use bucket index for SET_GC_MARK() in bch_btree_gc_finish() Coly Li
2021-02-10  5:07 ` [PATCH 15/20] bcache: add BCH_FEATURE_INCOMPAT_NVDIMM_META into incompat feature set Coly Li
2021-02-10  5:07 ` [PATCH 16/20] bcache: initialize bcache journal for NVDIMM meta device Coly Li
2021-02-10  5:07 ` [PATCH 17/20] bcache: support storing bcache journal into " Coly Li
2021-02-18 21:21   ` Nix
2021-02-10  5:07 ` [PATCH 18/20] bcache: read jset from NVDIMM pages for journal replay Coly Li
2021-02-10  5:07 ` Coly Li [this message]
2021-02-10  5:07 ` [PATCH 20/20] bcache: only initialize nvm-pages allocator when CONFIG_BCACHE_NVM_PAGES configured Coly Li
2021-02-10 15:11 ` [PATCH 00/20] bcache patches for Linux v5.12 Jens Axboe
2021-02-12 16:09   ` Coly Li

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