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* [PATCH v7 00/16] bcache: support NVDIMM for journaling
@ 2021-04-09 16:43 Coly Li
  2021-04-09 16:43 ` [PATCH v7 01/16] bcache: add initial data structures for nvm pages Coly Li
                   ` (15 more replies)
  0 siblings, 16 replies; 17+ messages in thread
From: Coly Li @ 2021-04-09 16:43 UTC (permalink / raw)
  To: linux-bcache
  Cc: linux-block, linux-nvdimm, axboe, jianpeng.ma, qiaowei.ren, hare,
	jack, Coly Li

This is the 7th effort for bcache to support NVDIMM for jouranling since
the first nvm-pages series was posted.

This series is combination of the v7 nvm-pages allocator developed by
Intel developers and related bcache changes from me.

The nvm-pages allocator is a buddy-like allocator, which allocates size
in power-of-2 pages from the NVDIMM namespace. User space tool 'bcache'
has a new added '-M' option to format a NVDIMM namespace and register it
via sysfs interface as a bcache meta device. The nvm-pages kernel code
does a DAX mapping to map the whole namespace into system's memory
address range, and allocating the pages to requestion like typical buddy
allocator does. The major difference is nvm-pages allocator maintains
the pages allocated to each requester by a owner list which stored on
NVDIMM too. Owner list of different requester is tracked by a pre-
defined UUID, all the pages tracked in all owner lists are treated as
allocated busy pages and won't be initialized into buddy system after
the system reboot.

The bcache journal code may request a block of power-of-2 size pages
from the nvm-pages allocator, normally it is a range of 256MB or 512MB
continuous pages range. During meta data journaling, the in-memory jsets
go into the calculated nvdimm pages location by kernel memcpy routine.
So the journaling I/Os won't go into block device (e.g. SSD) anymore, 
the write and read for journal jsets happen on NVDIMM.

The nvm-pages on-NVDIMM data structures are defined as legacy in-memory
objects, because they ARE in-memory objects directly referenced by
linear addresses, both in system DRAM and NVDIMM. They are defined in
the following patch,
- bcache: add initial data structures for nvm pages

Intel developers Jianpeng Ma and Qiaowei Ren compose the initial code of
nvm-pages, the related patches are,
- bcache: initialize the nvm pages allocator
- bcache: initialization of the buddy
- bcache: bch_nvm_alloc_pages() of the buddy
- bcache: bch_nvm_free_pages() of the buddy
- bcache: get allocated pages from specific owner
All the code depends on Linux libnvdimm and dax drivers, the bcache nvm-
pages allocator can be treated as user of these two drivers.

I modify the bcache code to recognize the nvm meta device feature,
initialize journal on NVDIMM, and do journal I/Os on NVDIMM in the
following patches,
- bcache: add initial data structures for nvm pages
- bcache: use bucket index to set GC_MARK_METADATA for journal buckets
  in bch_btree_gc_finish()
- bcache: add BCH_FEATURE_INCOMPAT_NVDIMM_META into incompat feature set
- bcache: initialize bcache journal for NVDIMM meta device
- bcache: support storing bcache journal into NVDIMM meta device
- bcache: read jset from NVDIMM pages for journal replay
- bcache: add sysfs interface register_nvdimm_meta to register NVDIMM
  meta device

Also during the code integration and testing, there are some issues are
fixed by the following patches,
- bcache: nvm-pages fixes for bcache integration testing
- bcache: use div_u64() in init_owner_info()
- bcache: fix BCACHE_NVM_PAGES' dependences in Kconfig
- bcache: more fix for compiling error when BCACHE_NVM_PAGES disabled
The above patches can be added or merged into nvm-pages code, so that
they can be dropped in next version of this series.

Current series works as expected, of course it is not perfect but the
state is fine as a code base for further improvement. For example the
power failure tolerance for nvm-pages owner list operations, more error
handling for journal code, and moving the B+ tree node I/Os into NVDIMM.

All the code is EXPERIMENTAL, they won't be enabled by default until we
feel the NVDIMM support is completed and stable.

Any comments and suggestion is warmly welcome :-)

Thank you in advance.

Coly Li

---
Changelog:
v7: Refine nvm-pages allocator code to operate owner list directly in
    dax mapped NVDIMM pages, and remove the meta data copy from DRAM.
v6: The series submitted but not merged in Linux 5.12 merge window.
v1-v5: RFC patches of bcache nvm-pages.


Coly Li (11):
  bcache: add initial data structures for nvm pages
  bcache: nvm-pages fixes for bcache integration testing
  bcache: use bucket index to set GC_MARK_METADATA for journal buckets
    in bch_btree_gc_finish()
  bcache: add BCH_FEATURE_INCOMPAT_NVDIMM_META into incompat feature set
  bcache: initialize bcache journal for NVDIMM meta device
  bcache: support storing bcache journal into NVDIMM meta device
  bcache: read jset from NVDIMM pages for journal replay
  bcache: add sysfs interface register_nvdimm_meta to register NVDIMM
    meta device
  bcache: use div_u64() in init_owner_info()
  bcache: fix BCACHE_NVM_PAGES' dependences in Kconfig
  bcache: more fix for compiling error when BCACHE_NVM_PAGES disabled

Jianpeng Ma (5):
  bcache: initialize the nvm pages allocator
  bcache: initialization of the buddy
  bcache: bch_nvm_alloc_pages() of the buddy
  bcache: bch_nvm_free_pages() of the buddy
  bcache: get allocated pages from specific owner

 drivers/md/bcache/Kconfig       |   9 +
 drivers/md/bcache/Makefile      |   2 +-
 drivers/md/bcache/btree.c       |   6 +-
 drivers/md/bcache/features.h    |   9 +
 drivers/md/bcache/journal.c     | 317 +++++++++++---
 drivers/md/bcache/journal.h     |   2 +-
 drivers/md/bcache/nvm-pages.c   | 744 ++++++++++++++++++++++++++++++++
 drivers/md/bcache/nvm-pages.h   |  95 ++++
 drivers/md/bcache/super.c       |  73 +++-
 include/uapi/linux/bcache-nvm.h | 208 +++++++++
 10 files changed, 1392 insertions(+), 73 deletions(-)
 create mode 100644 drivers/md/bcache/nvm-pages.c
 create mode 100644 drivers/md/bcache/nvm-pages.h
 create mode 100644 include/uapi/linux/bcache-nvm.h

-- 
2.26.2
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To unsubscribe send an email to linux-nvdimm-leave@lists.01.org

^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH v7 01/16] bcache: add initial data structures for nvm pages
  2021-04-09 16:43 [PATCH v7 00/16] bcache: support NVDIMM for journaling Coly Li
@ 2021-04-09 16:43 ` Coly Li
  2021-04-09 16:43 ` [PATCH v7 02/16] bcache: initialize the nvm pages allocator Coly Li
                   ` (14 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: Coly Li @ 2021-04-09 16:43 UTC (permalink / raw)
  To: linux-bcache
  Cc: linux-block, linux-nvdimm, axboe, jianpeng.ma, qiaowei.ren, hare,
	jack, Coly Li

This patch initializes the prototype data structures for nvm pages
allocator,

- struct bch_nvm_pages_sb
This is the super block allocated on each nvdimm namespace. A nvdimm
set may have multiple namespaces, bch_nvm_pages_sb->set_uuid is used
to mark which nvdimm set this name space belongs to. Normally we will
use the bcache's cache set UUID to initialize this uuid, to connect this
nvdimm set to a specified bcache cache set.

- struct bch_owner_list_head
This is a table for all heads of all owner lists. A owner list records
which page(s) allocated to which owner. After reboot from power failure,
the ownwer may find all its requested and allocated pages from the owner
list by a handler which is converted by a UUID.

- struct bch_nvm_pages_owner_head
This is a head of an owner list. Each owner only has one owner list,
and a nvm page only belongs to an specific owner. uuid[] will be set to
owner's uuid, for bcache it is the bcache's cache set uuid. label is not
mandatory, it is a human-readable string for debug purpose. The pointer
*recs references to separated nvm page which hold the table of struct
bch_nvm_pgalloc_rec.

- struct bch_nvm_pgalloc_recs
This struct occupies a whole page, owner_uuid should match the uuid
in struct bch_nvm_pages_owner_head. recs[] is the real table contains all
allocated records.

- struct bch_nvm_pgalloc_rec
Each structure records a range of allocated nvm pages.
  - Bits  0 - 51: is pages offset of the allocated pages.
  - Bits 52 - 57: allocaed size in page_size * order-of-2
  - Bits 58 - 63: reserved.
Since each of the allocated nvm pages are power of 2, using 6 bits to
represent allocated size can have (1<<(1<<64) - 1) * PAGE_SIZE maximum
value. It can be a 76 bits width range size in byte for 4KB page size,
which is large enough currently.

Signed-off-by: Coly Li <colyli@suse.de>
Cc: Jianpeng Ma <jianpeng.ma@intel.com>
Cc: Qiaowei Ren <qiaowei.ren@intel.com>
---
 include/uapi/linux/bcache-nvm.h | 202 ++++++++++++++++++++++++++++++++
 1 file changed, 202 insertions(+)
 create mode 100644 include/uapi/linux/bcache-nvm.h

diff --git a/include/uapi/linux/bcache-nvm.h b/include/uapi/linux/bcache-nvm.h
new file mode 100644
index 000000000000..3c381c1b32ba
--- /dev/null
+++ b/include/uapi/linux/bcache-nvm.h
@@ -0,0 +1,202 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+
+#ifndef _UAPI_BCACHE_NVM_H
+#define _UAPI_BCACHE_NVM_H
+
+/*
+ * Bcache on NVDIMM data structures
+ */
+
+/*
+ * - struct bch_nvm_pages_sb
+ *   This is the super block allocated on each nvdimm namespace. A nvdimm
+ * set may have multiple namespaces, bch_nvm_pages_sb->set_uuid is used to mark
+ * which nvdimm set this name space belongs to. Normally we will use the
+ * bcache's cache set UUID to initialize this uuid, to connect this nvdimm
+ * set to a specified bcache cache set.
+ *
+ * - struct bch_owner_list_head
+ *   This is a table for all heads of all owner lists. A owner list records
+ * which page(s) allocated to which owner. After reboot from power failure,
+ * the ownwer may find all its requested and allocated pages from the owner
+ * list by a handler which is converted by a UUID.
+ *
+ * - struct bch_nvm_pages_owner_head
+ *   This is a head of an owner list. Each owner only has one owner list,
+ * and a nvm page only belongs to an specific owner. uuid[] will be set to
+ * owner's uuid, for bcache it is the bcache's cache set uuid. label is not
+ * mandatory, it is a human-readable string for debug purpose. The pointer
+ * recs references to separated nvm page which hold the table of struct
+ * bch_pgalloc_rec.
+ *
+ *- struct bch_nvm_pgalloc_recs
+ *  This structure occupies a whole page, owner_uuid should match the uuid
+ * in struct bch_nvm_pages_owner_head. recs[] is the real table contains all
+ * allocated records.
+ *
+ * - struct bch_pgalloc_rec
+ *   Each structure records a range of allocated nvm pages. pgoff is offset
+ * in unit of page size of this allocated nvm page range. The adjoint page
+ * ranges of same owner can be merged into a larger one, therefore pages_nr
+ * is NOT always power of 2.
+ *
+ *
+ * Memory layout on nvdimm namespace 0
+ *
+ *    0 +---------------------------------+
+ *      |                                 |
+ *  4KB +---------------------------------+
+ *      |         bch_nvm_pages_sb        |
+ *  8KB +---------------------------------+ <--- bch_nvm_pages_sb.bch_owner_list_head
+ *      |       bch_owner_list_head       |
+ *      |                                 |
+ * 16KB +---------------------------------+ <--- bch_owner_list_head.heads[0].recs[0]
+ *      |       bch_nvm_pgalloc_recs      |
+ *      |  (nvm pages internal usage)     |
+ * 24KB +---------------------------------+
+ *      |                                 |
+ *      |                                 |
+ * 16MB  +---------------------------------+
+ *      |      allocable nvm pages        |
+ *      |      for buddy allocator        |
+ * end  +---------------------------------+
+ *
+ *
+ *
+ * Memory layout on nvdimm namespace N
+ * (doesn't have owner list)
+ *
+ *    0 +---------------------------------+
+ *      |                                 |
+ *  4KB +---------------------------------+
+ *      |         bch_nvm_pages_sb        |
+ *  8KB +---------------------------------+
+ *      |                                 |
+ *      |                                 |
+ *      |                                 |
+ *      |                                 |
+ *      |                                 |
+ *      |                                 |
+ * 16MB  +---------------------------------+
+ *      |      allocable nvm pages        |
+ *      |      for buddy allocator        |
+ * end  +---------------------------------+
+ *
+ */
+
+#include <linux/types.h>
+
+/* In sectors */
+#define BCH_NVM_PAGES_SB_OFFSET			4096
+#define BCH_NVM_PAGES_OFFSET			(16 << 20)
+
+#define BCH_NVM_PAGES_LABEL_SIZE		32
+#define BCH_NVM_PAGES_NAMESPACES_MAX		8
+
+#define BCH_NVM_PAGES_OWNER_LIST_HEAD_OFFSET	(8<<10)
+#define BCH_NVM_PAGES_SYS_RECS_HEAD_OFFSET	(16<<10)
+
+#define BCH_NVM_PAGES_SB_VERSION		0
+#define BCH_NVM_PAGES_SB_VERSION_MAX		0
+
+static const unsigned char bch_nvm_pages_magic[] = {
+	0x17, 0xbd, 0x53, 0x7f, 0x1b, 0x23, 0xd6, 0x83,
+	0x46, 0xa4, 0xf8, 0x28, 0x17, 0xda, 0xec, 0xa9 };
+static const unsigned char bch_nvm_pages_pgalloc_magic[] = {
+	0x39, 0x25, 0x3f, 0xf7, 0x27, 0x17, 0xd0, 0xb9,
+	0x10, 0xe6, 0xd2, 0xda, 0x38, 0x68, 0x26, 0xae };
+
+#if (__BITS_PER_LONG != 64)
+	#error "Non-64bit platform is not supported"
+#endif
+
+/* takes 64bit width */
+struct bch_pgalloc_rec {
+	__u64	pgoff:52;
+	__u64	order:6;
+	__u64	reserved:6;
+};
+
+struct bch_nvm_pgalloc_recs {
+union {
+	struct {
+		struct bch_nvm_pages_owner_head	*owner;
+		struct bch_nvm_pgalloc_recs	*next;
+		unsigned char			magic[16];
+		unsigned char			owner_uuid[16];
+		unsigned int			size;
+		unsigned int			used;
+		unsigned long			_pad[4];
+		struct bch_pgalloc_rec		recs[];
+	};
+	unsigned char				pad[8192];
+};
+};
+
+#define BCH_MAX_RECS					\
+	((sizeof(struct bch_nvm_pgalloc_recs) -		\
+	 offsetof(struct bch_nvm_pgalloc_recs, recs)) /	\
+	 sizeof(struct bch_pgalloc_rec))
+
+struct bch_nvm_pages_owner_head {
+	unsigned char			uuid[16];
+	unsigned char			label[BCH_NVM_PAGES_LABEL_SIZE];
+	/* Per-namespace own lists */
+	struct bch_nvm_pgalloc_recs	*recs[BCH_NVM_PAGES_NAMESPACES_MAX];
+};
+
+/* heads[0] is always for nvm_pages internal usage */
+struct bch_owner_list_head {
+union {
+	struct {
+		unsigned int			size;
+		unsigned int			used;
+		unsigned long			_pad[4];
+		struct bch_nvm_pages_owner_head	heads[];
+	};
+	unsigned char				pad[8192];
+};
+};
+#define BCH_MAX_OWNER_LIST				\
+	((sizeof(struct bch_owner_list_head) -		\
+	 offsetof(struct bch_owner_list_head, heads)) /	\
+	 sizeof(struct bch_nvm_pages_owner_head))
+
+/* The on-media bit order is local CPU order */
+struct bch_nvm_pages_sb {
+	unsigned long				csum;
+	unsigned long				ns_start;
+	unsigned long				sb_offset;
+	unsigned long				version;
+	unsigned char				magic[16];
+	unsigned char				uuid[16];
+	unsigned int				page_size;
+	unsigned int				total_namespaces_nr;
+	unsigned int				this_namespace_nr;
+	union {
+		unsigned char			set_uuid[16];
+		unsigned long			set_magic;
+	};
+
+	unsigned long				flags;
+	unsigned long				seq;
+
+	unsigned long				feature_compat;
+	unsigned long				feature_incompat;
+	unsigned long				feature_ro_compat;
+
+	/* For allocable nvm pages from buddy systems */
+	unsigned long				pages_offset;
+	unsigned long				pages_total;
+
+	unsigned long				pad[8];
+
+	/* Only on the first name space */
+	struct bch_owner_list_head		*owner_list_head;
+
+	/* Just for csum_set() */
+	unsigned int				keys;
+	unsigned long				d[0];
+};
+
+#endif /* _UAPI_BCACHE_NVM_H */
-- 
2.26.2
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To unsubscribe send an email to linux-nvdimm-leave@lists.01.org

^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH v7 02/16] bcache: initialize the nvm pages allocator
  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 ` Coly Li
  2021-04-09 16:43 ` [PATCH v7 03/16] bcache: initialization of the buddy Coly Li
                   ` (13 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: Coly Li @ 2021-04-09 16:43 UTC (permalink / raw)
  To: linux-bcache
  Cc: linux-block, linux-nvdimm, axboe, jianpeng.ma, qiaowei.ren, hare, jack

From: Jianpeng Ma <jianpeng.ma@intel.com>

This patch define the prototype data structures in memory and initializes
the nvm pages allocator.

The nv address space which is managed by this allocatior can consist of
many nvm namespaces, and some namespaces can compose into one nvm set,
like cache set. For this initial implementation, only one set can be
supported.

The users of this nvm pages allocator need to call regiseter_namespace()
to register the nvdimm device (like /dev/pmemX) into this allocator as
the instance of struct nvm_namespace.

Signed-off-by: Jianpeng Ma <jianpeng.ma@intel.com>
Co-authored-by: Qiaowei Ren <qiaowei.ren@intel.com>
---
 drivers/md/bcache/Kconfig     |   6 +
 drivers/md/bcache/Makefile    |   2 +-
 drivers/md/bcache/nvm-pages.c | 284 ++++++++++++++++++++++++++++++++++
 drivers/md/bcache/nvm-pages.h |  71 +++++++++
 drivers/md/bcache/super.c     |   3 +
 5 files changed, 365 insertions(+), 1 deletion(-)
 create mode 100644 drivers/md/bcache/nvm-pages.c
 create mode 100644 drivers/md/bcache/nvm-pages.h

diff --git a/drivers/md/bcache/Kconfig b/drivers/md/bcache/Kconfig
index d1ca4d059c20..fdec9905ef40 100644
--- a/drivers/md/bcache/Kconfig
+++ b/drivers/md/bcache/Kconfig
@@ -35,3 +35,9 @@ config BCACHE_ASYNC_REGISTRATION
 	device path into this file will returns immediately and the real
 	registration work is handled in kernel work queue in asynchronous
 	way.
+
+config BCACHE_NVM_PAGES
+	bool "NVDIMM support for bcache (EXPERIMENTAL)"
+	depends on BCACHE
+	help
+	nvm pages allocator for bcache.
diff --git a/drivers/md/bcache/Makefile b/drivers/md/bcache/Makefile
index 5b87e59676b8..948e5ed2ca66 100644
--- a/drivers/md/bcache/Makefile
+++ b/drivers/md/bcache/Makefile
@@ -4,4 +4,4 @@ obj-$(CONFIG_BCACHE)	+= bcache.o
 
 bcache-y		:= alloc.o bset.o btree.o closure.o debug.o extents.o\
 	io.o journal.o movinggc.o request.o stats.o super.o sysfs.o trace.o\
-	util.o writeback.o features.o
+	util.o writeback.o features.o nvm-pages.o
diff --git a/drivers/md/bcache/nvm-pages.c b/drivers/md/bcache/nvm-pages.c
new file mode 100644
index 000000000000..101b108b9766
--- /dev/null
+++ b/drivers/md/bcache/nvm-pages.c
@@ -0,0 +1,284 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Nvdimm page-buddy allocator
+ *
+ * Copyright (c) 2021, Intel Corporation.
+ * Copyright (c) 2021, Qiaowei Ren <qiaowei.ren@intel.com>.
+ * Copyright (c) 2021, Jianpeng Ma <jianpeng.ma@intel.com>.
+ */
+
+#include "bcache.h"
+#include "nvm-pages.h"
+
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/dax.h>
+#include <linux/pfn_t.h>
+#include <linux/libnvdimm.h>
+#include <linux/mm_types.h>
+#include <linux/err.h>
+#include <linux/pagemap.h>
+#include <linux/bitmap.h>
+#include <linux/blkdev.h>
+
+#ifdef CONFIG_BCACHE_NVM_PAGES
+
+struct bch_nvm_set *only_set;
+
+static void release_nvm_namespaces(struct bch_nvm_set *nvm_set)
+{
+	int i;
+	struct bch_nvm_namespace *ns;
+
+	for (i = 0; i < nvm_set->total_namespaces_nr; i++) {
+		ns = nvm_set->nss[i];
+		if (ns) {
+			blkdev_put(ns->bdev, FMODE_READ|FMODE_WRITE|FMODE_EXEC);
+			kfree(ns);
+		}
+	}
+
+	kfree(nvm_set->nss);
+}
+
+static void release_nvm_set(struct bch_nvm_set *nvm_set)
+{
+	release_nvm_namespaces(nvm_set);
+	kfree(nvm_set);
+}
+
+static int init_owner_info(struct bch_nvm_namespace *ns)
+{
+	struct bch_owner_list_head *owner_list_head = ns->sb->owner_list_head;
+
+	mutex_lock(&only_set->lock);
+	only_set->owner_list_head = owner_list_head;
+	only_set->owner_list_size = owner_list_head->size;
+	only_set->owner_list_used = owner_list_head->used;
+	mutex_unlock(&only_set->lock);
+
+	return 0;
+}
+
+static bool attach_nvm_set(struct bch_nvm_namespace *ns)
+{
+	bool rc = true;
+
+	mutex_lock(&only_set->lock);
+	if (only_set->nss) {
+		if (memcmp(ns->sb->set_uuid, only_set->set_uuid, 16)) {
+			pr_info("namespace id doesn't match nvm set\n");
+			rc = false;
+			goto unlock;
+		}
+
+		if (only_set->nss[ns->sb->this_namespace_nr]) {
+			pr_info("already has the same position(%d) nvm\n",
+					ns->sb->this_namespace_nr);
+			rc = false;
+			goto unlock;
+		}
+	} else {
+		memcpy(only_set->set_uuid, ns->sb->set_uuid, 16);
+		only_set->total_namespaces_nr = ns->sb->total_namespaces_nr;
+		only_set->nss = kcalloc(only_set->total_namespaces_nr,
+				sizeof(struct bch_nvm_namespace *), GFP_KERNEL);
+		if (!only_set->nss) {
+			rc = false;
+			goto unlock;
+		}
+	}
+
+	only_set->nss[ns->sb->this_namespace_nr] = ns;
+
+unlock:
+	mutex_unlock(&only_set->lock);
+	return rc;
+}
+
+static int read_nvdimm_meta_super(struct block_device *bdev,
+			      struct bch_nvm_namespace *ns)
+{
+	struct page *page;
+	struct bch_nvm_pages_sb *sb;
+
+	page = read_cache_page_gfp(bdev->bd_inode->i_mapping,
+			BCH_NVM_PAGES_SB_OFFSET >> PAGE_SHIFT, GFP_KERNEL);
+
+	if (IS_ERR(page))
+		return -EIO;
+
+	sb = page_address(page) + offset_in_page(BCH_NVM_PAGES_SB_OFFSET);
+
+	// temporary use for DAX API
+	ns->page_size = sb->page_size;
+	ns->pages_total = sb->pages_total;
+
+	put_page(page);
+
+	return 0;
+}
+
+struct bch_nvm_namespace *bch_register_namespace(const char *dev_path)
+{
+	struct bch_nvm_namespace *ns;
+	int err;
+	pgoff_t pgoff;
+	char buf[BDEVNAME_SIZE];
+	struct block_device *bdev;
+	uint64_t expected_csum;
+	int id;
+	char *path = NULL;
+
+	path = kstrndup(dev_path, 512, GFP_KERNEL);
+	if (!path) {
+		pr_err("kstrndup failed\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	bdev = blkdev_get_by_path(strim(path),
+				  FMODE_READ|FMODE_WRITE|FMODE_EXEC,
+				  only_set);
+	if (IS_ERR(bdev)) {
+		pr_info("get %s error: %ld\n", dev_path, PTR_ERR(bdev));
+		kfree(path);
+		return ERR_PTR(PTR_ERR(bdev));
+	}
+
+	ns = kzalloc(sizeof(struct bch_nvm_namespace), GFP_KERNEL);
+	if (!ns)
+		goto bdput;
+
+	err = -EIO;
+	if (read_nvdimm_meta_super(bdev, ns)) {
+		pr_info("%s read nvdimm meta super block failed.\n",
+			bdevname(bdev, buf));
+		goto free_ns;
+	}
+
+	err = -EOPNOTSUPP;
+	if (!bdev_dax_supported(bdev, ns->page_size)) {
+		pr_info("%s don't support DAX\n", bdevname(bdev, buf));
+		goto free_ns;
+	}
+
+	err = -EINVAL;
+	if (bdev_dax_pgoff(bdev, 0, ns->page_size, &pgoff)) {
+		pr_info("invalid offset of %s\n", bdevname(bdev, buf));
+		goto free_ns;
+	}
+
+	err = -ENOMEM;
+	ns->dax_dev = fs_dax_get_by_bdev(bdev);
+	if (!ns->dax_dev) {
+		pr_info("can't by dax device by %s\n", bdevname(bdev, buf));
+		goto free_ns;
+	}
+
+	err = -EINVAL;
+	id = dax_read_lock();
+	if (dax_direct_access(ns->dax_dev, pgoff, ns->pages_total,
+			      &ns->kaddr, &ns->start_pfn) <= 0) {
+		pr_info("dax_direct_access error\n");
+		dax_read_unlock(id);
+		goto free_ns;
+	}
+	dax_read_unlock(id);
+
+	ns->sb = ns->kaddr + BCH_NVM_PAGES_SB_OFFSET;
+
+	if (memcmp(ns->sb->magic, bch_nvm_pages_magic, 16)) {
+		pr_info("invalid bch_nvm_pages_magic\n");
+		goto free_ns;
+	}
+
+	if (ns->sb->sb_offset != BCH_NVM_PAGES_SB_OFFSET) {
+		pr_info("invalid superblock offset\n");
+		goto free_ns;
+	}
+
+	if (ns->sb->total_namespaces_nr != 1) {
+		pr_info("only one nvm device\n");
+		goto free_ns;
+	}
+
+	expected_csum = csum_set(ns->sb);
+	if (expected_csum != ns->sb->csum) {
+		pr_info("csum is not match with expected one\n");
+		goto free_ns;
+	}
+
+	err = -EEXIST;
+	if (!attach_nvm_set(ns))
+		goto free_ns;
+
+	// Firstly attach
+	if ((unsigned long)ns->sb->owner_list_head == BCH_NVM_PAGES_OWNER_LIST_HEAD_OFFSET) {
+		struct bch_nvm_pages_owner_head *sys_owner_head;
+		struct bch_nvm_pgalloc_recs *sys_pgalloc_recs;
+
+		ns->sb->owner_list_head = ns->kaddr + BCH_NVM_PAGES_OWNER_LIST_HEAD_OFFSET;
+		sys_pgalloc_recs = ns->kaddr + BCH_NVM_PAGES_SYS_RECS_HEAD_OFFSET;
+
+		sys_owner_head = &(ns->sb->owner_list_head->heads[0]);
+		sys_owner_head->recs[0] = sys_pgalloc_recs;
+		ns->sb->csum = csum_set(ns->sb);
+
+		sys_pgalloc_recs->owner = sys_owner_head;
+	} else
+		BUG_ON(ns->sb->owner_list_head !=
+			(ns->kaddr + BCH_NVM_PAGES_OWNER_LIST_HEAD_OFFSET));
+
+	ns->page_size = ns->sb->page_size;
+	ns->pages_offset = ns->sb->pages_offset;
+	ns->pages_total = ns->sb->pages_total;
+	ns->free = 0;
+	ns->bdev = bdev;
+	ns->nvm_set = only_set;
+	mutex_init(&ns->lock);
+
+	if (ns->sb->this_namespace_nr == 0) {
+		pr_info("only first namespace contain owner info\n");
+		err = init_owner_info(ns);
+		if (err < 0) {
+			pr_info("init_owner_info met error %d\n", err);
+			only_set->nss[ns->sb->this_namespace_nr] = NULL;
+			goto free_ns;
+		}
+	}
+
+	kfree(path);
+	return ns;
+free_ns:
+	kfree(ns);
+bdput:
+	blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXEC);
+	kfree(path);
+	return ERR_PTR(err);
+}
+EXPORT_SYMBOL_GPL(bch_register_namespace);
+
+int __init bch_nvm_init(void)
+{
+	only_set = kzalloc(sizeof(*only_set), GFP_KERNEL);
+	if (!only_set)
+		return -ENOMEM;
+
+	only_set->total_namespaces_nr = 0;
+	only_set->owner_list_head = NULL;
+	only_set->nss = NULL;
+
+	mutex_init(&only_set->lock);
+
+	pr_info("bcache nvm init\n");
+	return 0;
+}
+
+void bch_nvm_exit(void)
+{
+	release_nvm_set(only_set);
+	pr_info("bcache nvm exit\n");
+}
+
+#endif /* CONFIG_BCACHE_NVM_PAGES */
diff --git a/drivers/md/bcache/nvm-pages.h b/drivers/md/bcache/nvm-pages.h
new file mode 100644
index 000000000000..3b723a775b7b
--- /dev/null
+++ b/drivers/md/bcache/nvm-pages.h
@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _BCACHE_NVM_PAGES_H
+#define _BCACHE_NVM_PAGES_H
+
+#include <linux/bcache-nvm.h>
+
+/*
+ * Bcache NVDIMM in memory data structures
+ */
+
+/*
+ * The following three structures in memory records which page(s) allocated
+ * to which owner. After reboot from power failure, they will be initialized
+ * based on nvm pages superblock in NVDIMM device.
+ */
+struct bch_nvm_namespace {
+	struct bch_nvm_pages_sb *sb;
+	void *kaddr;
+
+	u8 uuid[16];
+	u64 free;
+	u32 page_size;
+	u64 pages_offset;
+	u64 pages_total;
+	pfn_t start_pfn;
+
+	struct dax_device *dax_dev;
+	struct block_device *bdev;
+	struct bch_nvm_set *nvm_set;
+
+	struct mutex lock;
+};
+
+/*
+ * A set of namespaces. Currently only one set can be supported.
+ */
+struct bch_nvm_set {
+	u8 set_uuid[16];
+	u32 total_namespaces_nr;
+
+	u32 owner_list_size;
+	u32 owner_list_used;
+	struct bch_owner_list_head *owner_list_head;
+
+	struct bch_nvm_namespace **nss;
+
+	struct mutex lock;
+};
+extern struct bch_nvm_set *only_set;
+
+#ifdef CONFIG_BCACHE_NVM_PAGES
+
+struct bch_nvm_namespace *bch_register_namespace(const char *dev_path);
+int bch_nvm_init(void);
+void bch_nvm_exit(void);
+
+#else
+
+static inline struct bch_nvm_namespace *bch_register_namespace(const char *dev_path)
+	return NULL;
+}
+static inline int bch_nvm_init(void)
+{
+	return 0;
+}
+static inline void bch_nvm_exit(void) { }
+
+#endif /* CONFIG_BCACHE_NVM_PAGES */
+
+#endif /* _BCACHE_NVM_PAGES_H */
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 03e1fe4de53d..0674a76d9454 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -14,6 +14,7 @@
 #include "request.h"
 #include "writeback.h"
 #include "features.h"
+#include "nvm-pages.h"
 
 #include <linux/blkdev.h>
 #include <linux/debugfs.h>
@@ -2816,6 +2817,7 @@ static void bcache_exit(void)
 {
 	bch_debug_exit();
 	bch_request_exit();
+	bch_nvm_exit();
 	if (bcache_kobj)
 		kobject_put(bcache_kobj);
 	if (bcache_wq)
@@ -2914,6 +2916,7 @@ static int __init bcache_init(void)
 
 	bch_debug_init();
 	closure_debug_init();
+	bch_nvm_init();
 
 	bcache_is_reboot = false;
 
-- 
2.26.2
_______________________________________________
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To unsubscribe send an email to linux-nvdimm-leave@lists.01.org

^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH v7 03/16] bcache: initialization of the buddy
  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 ` Coly Li
  2021-04-09 16:43 ` [PATCH v7 04/16] bcache: bch_nvm_alloc_pages() " Coly Li
                   ` (12 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: Coly Li @ 2021-04-09 16:43 UTC (permalink / raw)
  To: linux-bcache
  Cc: linux-block, linux-nvdimm, axboe, jianpeng.ma, qiaowei.ren, hare, jack

From: Jianpeng Ma <jianpeng.ma@intel.com>

This nvm pages allocator will implement the simple buddy to manage the
nvm address space. This patch initializes this buddy for new namespace.

the unit of alloc/free of the buddy is page. DAX device has their
struct page(in dram or PMEM).

        struct {        /* ZONE_DEVICE pages */
                /** @pgmap: Points to the hosting device page map. */
                struct dev_pagemap *pgmap;
                void *zone_device_data;
                /*
                 * ZONE_DEVICE private pages are counted as being
                 * mapped so the next 3 words hold the mapping, index,
                 * and private fields from the source anonymous or
                 * page cache page while the page is migrated to device
                 * private memory.
                 * ZONE_DEVICE MEMORY_DEVICE_FS_DAX pages also
                 * use the mapping, index, and private fields when
                 * pmem backed DAX files are mapped.
                 */
        };

ZONE_DEVICE pages only use pgmap. Other 4 words[16/32 bytes] don't use.
So the second/third word will be used as 'struct list_head ' which list
in buddy. The fourth word(that is normal struct page::index) store pgoff
which the page-offset in the dax device. And the fifth word (that is
normal struct page::private) store order of buddy. page_type will be used
to store buddy flags.

Signed-off-by: Jianpeng Ma <jianpeng.ma@intel.com>
Co-authored-by: Qiaowei Ren <qiaowei.ren@intel.com>
---
 drivers/md/bcache/nvm-pages.c   | 142 +++++++++++++++++++++++++++++++-
 drivers/md/bcache/nvm-pages.h   |   6 ++
 include/uapi/linux/bcache-nvm.h |  12 ++-
 3 files changed, 153 insertions(+), 7 deletions(-)

diff --git a/drivers/md/bcache/nvm-pages.c b/drivers/md/bcache/nvm-pages.c
index 101b108b9766..fef497c7acb3 100644
--- a/drivers/md/bcache/nvm-pages.c
+++ b/drivers/md/bcache/nvm-pages.c
@@ -34,6 +34,10 @@ static void release_nvm_namespaces(struct bch_nvm_set *nvm_set)
 	for (i = 0; i < nvm_set->total_namespaces_nr; i++) {
 		ns = nvm_set->nss[i];
 		if (ns) {
+			kvfree(ns->pages_bitmap);
+			if (ns->pgalloc_recs_bitmap)
+				bitmap_free(ns->pgalloc_recs_bitmap);
+
 			blkdev_put(ns->bdev, FMODE_READ|FMODE_WRITE|FMODE_EXEC);
 			kfree(ns);
 		}
@@ -48,17 +52,122 @@ static void release_nvm_set(struct bch_nvm_set *nvm_set)
 	kfree(nvm_set);
 }
 
+static struct page *nvm_vaddr_to_page(struct bch_nvm_namespace *ns, void *addr)
+{
+	return virt_to_page(addr);
+}
+
+static void *nvm_pgoff_to_vaddr(struct bch_nvm_namespace *ns, pgoff_t pgoff)
+{
+	return ns->kaddr + (pgoff << PAGE_SHIFT);
+}
+
+static inline void remove_owner_space(struct bch_nvm_namespace *ns,
+					pgoff_t pgoff, u32 nr)
+{
+	bitmap_set(ns->pages_bitmap, pgoff, nr);
+}
+
 static int init_owner_info(struct bch_nvm_namespace *ns)
 {
 	struct bch_owner_list_head *owner_list_head = ns->sb->owner_list_head;
+	struct bch_nvm_pgalloc_recs *sys_recs;
+	int i, j, k, rc = 0;
 
 	mutex_lock(&only_set->lock);
 	only_set->owner_list_head = owner_list_head;
 	only_set->owner_list_size = owner_list_head->size;
 	only_set->owner_list_used = owner_list_head->used;
+
+	/*remove used space*/
+	remove_owner_space(ns, 0, ns->pages_offset/ns->page_size);
+
+	sys_recs = ns->kaddr + BCH_NVM_PAGES_SYS_RECS_HEAD_OFFSET;
+	// suppose no hole in array
+	for (i = 0; i < owner_list_head->used; i++) {
+		struct bch_nvm_pages_owner_head *head = &owner_list_head->heads[i];
+
+		for (j = 0; j < BCH_NVM_PAGES_NAMESPACES_MAX; j++) {
+			struct bch_nvm_pgalloc_recs *pgalloc_recs = head->recs[j];
+			unsigned long offset = (unsigned long)ns->kaddr >> PAGE_SHIFT;
+			struct page *page;
+
+			while (pgalloc_recs) {
+				u32 pgalloc_recs_pos = (unsigned long)(pgalloc_recs - sys_recs);
+
+				if (memcmp(pgalloc_recs->magic, bch_nvm_pages_pgalloc_magic, 16)) {
+					pr_info("invalid bch_nvm_pages_pgalloc_magic\n");
+					rc = -EINVAL;
+					goto unlock;
+				}
+				if (memcmp(pgalloc_recs->owner_uuid, head->uuid, 16)) {
+					pr_info("invalid owner_uuid in bch_nvm_pgalloc_recs\n");
+					rc = -EINVAL;
+					goto unlock;
+				}
+				if (pgalloc_recs->owner != head) {
+					pr_info("invalid owner in bch_nvm_pgalloc_recs\n");
+					rc = -EINVAL;
+					goto unlock;
+				}
+
+				// recs array can has hole
+				for (k = 0; k < pgalloc_recs->size; k++) {
+					struct bch_pgalloc_rec *rec = &pgalloc_recs->recs[k];
+
+					if (rec->pgoff) {
+						BUG_ON(rec->pgoff <= offset);
+
+						/*init struct page: index/private */
+						page = nvm_vaddr_to_page(ns,
+							BCH_PGOFF_TO_KVADDR(rec->pgoff));
+
+						set_page_private(page, rec->order);
+						page->index = rec->pgoff - offset;
+
+						remove_owner_space(ns,
+							rec->pgoff - offset,
+							1 << rec->order);
+					}
+				}
+				bitmap_set(ns->pgalloc_recs_bitmap, pgalloc_recs_pos, 1);
+				pgalloc_recs = pgalloc_recs->next;
+			}
+		}
+	}
+unlock:
 	mutex_unlock(&only_set->lock);
 
-	return 0;
+	return rc;
+}
+
+static void init_nvm_free_space(struct bch_nvm_namespace *ns)
+{
+	unsigned int start, end, i;
+	struct page *page;
+	long long pages;
+	pgoff_t pgoff_start;
+
+	bitmap_for_each_clear_region(ns->pages_bitmap, start, end, 0, ns->pages_total) {
+		pgoff_start = start;
+		pages = end - start;
+
+		while (pages) {
+			for (i = BCH_MAX_ORDER - 1; i >= 0 ; i--) {
+				if ((pgoff_start % (1 << i) == 0) && (pages >= (1 << i)))
+					break;
+			}
+
+			page = nvm_vaddr_to_page(ns, nvm_pgoff_to_vaddr(ns, pgoff_start));
+			page->index = pgoff_start;
+			set_page_private(page, i);
+			__SetPageBuddy(page);
+			list_add((struct list_head *)&page->zone_device_data, &ns->free_area[i]);
+
+			pgoff_start += 1 << i;
+			pages -= 1 << i;
+		}
+	}
 }
 
 static bool attach_nvm_set(struct bch_nvm_namespace *ns)
@@ -123,7 +232,7 @@ static int read_nvdimm_meta_super(struct block_device *bdev,
 struct bch_nvm_namespace *bch_register_namespace(const char *dev_path)
 {
 	struct bch_nvm_namespace *ns;
-	int err;
+	int i, err;
 	pgoff_t pgoff;
 	char buf[BDEVNAME_SIZE];
 	struct block_device *bdev;
@@ -238,18 +347,43 @@ struct bch_nvm_namespace *bch_register_namespace(const char *dev_path)
 	ns->nvm_set = only_set;
 	mutex_init(&ns->lock);
 
+	ns->pages_bitmap = kvcalloc(BITS_TO_LONGS(ns->pages_total),
+					sizeof(unsigned long), GFP_KERNEL);
+	if (!ns->pages_bitmap) {
+		err = -ENOMEM;
+		goto clear_ns_nr;
+	}
+
+	if (ns->sb->this_namespace_nr == 0) {
+		ns->pgalloc_recs_bitmap = bitmap_zalloc(BCH_MAX_PGALLOC_RECS, GFP_KERNEL);
+		if (ns->pgalloc_recs_bitmap == NULL) {
+			err = -ENOMEM;
+			goto free_pages_bitmap;
+		}
+	}
+
+	for (i = 0; i < BCH_MAX_ORDER; i++)
+		INIT_LIST_HEAD(&ns->free_area[i]);
+
 	if (ns->sb->this_namespace_nr == 0) {
 		pr_info("only first namespace contain owner info\n");
 		err = init_owner_info(ns);
 		if (err < 0) {
 			pr_info("init_owner_info met error %d\n", err);
-			only_set->nss[ns->sb->this_namespace_nr] = NULL;
-			goto free_ns;
+			goto free_recs_bitmap;
 		}
+		/* init buddy allocator */
+		init_nvm_free_space(ns);
 	}
 
 	kfree(path);
 	return ns;
+free_recs_bitmap:
+	bitmap_free(ns->pgalloc_recs_bitmap);
+free_pages_bitmap:
+	kvfree(ns->pages_bitmap);
+clear_ns_nr:
+	only_set->nss[ns->sb->this_namespace_nr] = NULL;
 free_ns:
 	kfree(ns);
 bdput:
diff --git a/drivers/md/bcache/nvm-pages.h b/drivers/md/bcache/nvm-pages.h
index 3b723a775b7b..c158033e24f0 100644
--- a/drivers/md/bcache/nvm-pages.h
+++ b/drivers/md/bcache/nvm-pages.h
@@ -14,6 +14,7 @@
  * to which owner. After reboot from power failure, they will be initialized
  * based on nvm pages superblock in NVDIMM device.
  */
+#define BCH_MAX_ORDER 20
 struct bch_nvm_namespace {
 	struct bch_nvm_pages_sb *sb;
 	void *kaddr;
@@ -25,6 +26,11 @@ struct bch_nvm_namespace {
 	u64 pages_total;
 	pfn_t start_pfn;
 
+	unsigned long *pages_bitmap;
+	struct list_head free_area[BCH_MAX_ORDER];
+
+	unsigned long *pgalloc_recs_bitmap;
+
 	struct dax_device *dax_dev;
 	struct block_device *bdev;
 	struct bch_nvm_set *nvm_set;
diff --git a/include/uapi/linux/bcache-nvm.h b/include/uapi/linux/bcache-nvm.h
index 3c381c1b32ba..ec2626c418c6 100644
--- a/include/uapi/linux/bcache-nvm.h
+++ b/include/uapi/linux/bcache-nvm.h
@@ -117,6 +117,8 @@ struct bch_pgalloc_rec {
 	__u64	reserved:6;
 };
 
+#define BCH_PGOFF_TO_KVADDR(pgoff) ((void *)((unsigned long)pgoff << PAGE_SHIFT))
+
 struct bch_nvm_pgalloc_recs {
 union {
 	struct {
@@ -133,11 +135,15 @@ union {
 };
 };
 
-#define BCH_MAX_RECS					\
-	((sizeof(struct bch_nvm_pgalloc_recs) -		\
-	 offsetof(struct bch_nvm_pgalloc_recs, recs)) /	\
+#define BCH_MAX_RECS							\
+	((sizeof(struct bch_nvm_pgalloc_recs) -				\
+	 offsetof(struct bch_nvm_pgalloc_recs, recs)) /			\
 	 sizeof(struct bch_pgalloc_rec))
 
+#define BCH_MAX_PGALLOC_RECS						\
+	((BCH_NVM_PAGES_OFFSET - BCH_NVM_PAGES_SYS_RECS_HEAD_OFFSET) /	\
+	 sizeof(struct bch_nvm_pgalloc_recs))
+
 struct bch_nvm_pages_owner_head {
 	unsigned char			uuid[16];
 	unsigned char			label[BCH_NVM_PAGES_LABEL_SIZE];
-- 
2.26.2
_______________________________________________
Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org
To unsubscribe send an email to linux-nvdimm-leave@lists.01.org

^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH v7 04/16] bcache: bch_nvm_alloc_pages() of the buddy
  2021-04-09 16:43 [PATCH v7 00/16] bcache: support NVDIMM for journaling Coly Li
                   ` (2 preceding siblings ...)
  2021-04-09 16:43 ` [PATCH v7 03/16] bcache: initialization of the buddy Coly Li
@ 2021-04-09 16:43 ` Coly Li
  2021-04-09 16:43 ` [PATCH v7 05/16] bcache: bch_nvm_free_pages() " Coly Li
                   ` (11 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: Coly Li @ 2021-04-09 16:43 UTC (permalink / raw)
  To: linux-bcache
  Cc: linux-block, linux-nvdimm, axboe, jianpeng.ma, qiaowei.ren, hare, jack

From: Jianpeng Ma <jianpeng.ma@intel.com>

This patch implements the bch_nvm_alloc_pages() of the buddy.

Signed-off-by: Jianpeng Ma <jianpeng.ma@intel.com>
Co-authored-by: Qiaowei Ren <qiaowei.ren@intel.com>
---
 drivers/md/bcache/nvm-pages.c | 157 ++++++++++++++++++++++++++++++++++
 drivers/md/bcache/nvm-pages.h |   6 ++
 2 files changed, 163 insertions(+)

diff --git a/drivers/md/bcache/nvm-pages.c b/drivers/md/bcache/nvm-pages.c
index fef497c7acb3..6bdc7d3773de 100644
--- a/drivers/md/bcache/nvm-pages.c
+++ b/drivers/md/bcache/nvm-pages.c
@@ -21,6 +21,7 @@
 #include <linux/pagemap.h>
 #include <linux/bitmap.h>
 #include <linux/blkdev.h>
+#include <linux/bcache-nvm.h>
 
 #ifdef CONFIG_BCACHE_NVM_PAGES
 
@@ -68,6 +69,162 @@ static inline void remove_owner_space(struct bch_nvm_namespace *ns,
 	bitmap_set(ns->pages_bitmap, pgoff, nr);
 }
 
+/* If not found, it will create if create == true */
+static struct bch_nvm_pages_owner_head *find_owner_head(const char *owner_uuid, bool create)
+{
+	struct bch_owner_list_head *owner_list_head = only_set->owner_list_head;
+	int i;
+
+	for (i = 0; i < only_set->owner_list_used; i++) {
+		if (!memcmp(owner_uuid, owner_list_head->heads[i].uuid, 16))
+			return &(owner_list_head->heads[i]);
+	}
+
+	if (create) {
+		int used = only_set->owner_list_used;
+
+		BUG_ON(only_set->owner_list_size == used);
+		memcpy(owner_list_head->heads[used].uuid, owner_uuid, 16);
+		only_set->owner_list_used++;
+
+		owner_list_head->used++;
+		return &(owner_list_head->heads[used]);
+	} else
+		return NULL;
+}
+
+static struct bch_nvm_pgalloc_recs *find_empty_pgalloc_recs(void)
+{
+	unsigned int start;
+	struct bch_nvm_namespace *ns = only_set->nss[0];
+	struct bch_nvm_pgalloc_recs *recs;
+
+	start = bitmap_find_next_zero_area(ns->pgalloc_recs_bitmap, BCH_MAX_PGALLOC_RECS, 0, 1, 0);
+	if (start > BCH_MAX_PGALLOC_RECS) {
+		pr_info("no free struct bch_nvm_pgalloc_recs\n");
+		return NULL;
+	}
+
+	bitmap_set(ns->pgalloc_recs_bitmap, start, 1);
+	recs = (struct bch_nvm_pgalloc_recs *)(ns->kaddr + BCH_NVM_PAGES_SYS_RECS_HEAD_OFFSET)
+		+ start;
+	return recs;
+}
+
+static struct bch_nvm_pgalloc_recs *find_nvm_pgalloc_recs(struct bch_nvm_namespace *ns,
+		struct bch_nvm_pages_owner_head *owner_head, bool create)
+{
+	int ns_nr = ns->sb->this_namespace_nr;
+	struct bch_nvm_pgalloc_recs *prev_recs = NULL, *recs = owner_head->recs[ns_nr];
+
+	// If create=false, we return recs[nr]
+	if (!create)
+		return recs;
+
+	// If create=true, it mean we need a empty struct bch_pgalloc_rec
+	// So we should find non-empty struct bch_nvm_pgalloc_recs or alloc
+	// new struct bch_nvm_pgalloc_recs. And return this bch_nvm_pgalloc_recs
+	while (recs && (recs->used == recs->size)) {
+		prev_recs = recs;
+		recs = recs->next;
+	}
+
+	// Found empty struct bch_nvm_pgalloc_recs
+	if (recs)
+		return recs;
+	// Need alloc new struct bch_nvm_galloc_recs
+	recs = find_empty_pgalloc_recs();
+	if (recs) {
+		recs->next = NULL;
+		recs->owner = owner_head;
+		strncpy(recs->magic, bch_nvm_pages_pgalloc_magic, 16);
+		strncpy(recs->owner_uuid, owner_head->uuid, 16);
+		recs->size = BCH_MAX_RECS;
+		recs->used = 0;
+
+		if (prev_recs)
+			prev_recs->next = recs;
+		else
+			owner_head->recs[ns_nr] = recs;
+	}
+
+	return recs;
+}
+
+static void add_pgalloc_rec(struct bch_nvm_pgalloc_recs *recs, void *kaddr, int order)
+{
+	int i;
+
+	for (i = 0; i < recs->size; i++) {
+		if (recs->recs[i].pgoff == 0) {
+			recs->recs[i].pgoff = (unsigned long)kaddr >> PAGE_SHIFT;
+			recs->recs[i].order = order;
+			recs->used++;
+			break;
+		}
+	}
+	BUG_ON(i == recs->size);
+}
+
+void *bch_nvm_alloc_pages(int order, const char *owner_uuid)
+{
+	void *kaddr = NULL;
+	struct bch_nvm_pgalloc_recs *pgalloc_recs;
+	struct bch_nvm_pages_owner_head *owner_head;
+	int i, j;
+
+	mutex_lock(&only_set->lock);
+	owner_head = find_owner_head(owner_uuid, true);
+
+	for (j = 0; j < only_set->total_namespaces_nr; j++) {
+		struct bch_nvm_namespace *ns = only_set->nss[j];
+
+		if (!ns || (ns->free < (1 << order)))
+			continue;
+
+		for (i = order; i < BCH_MAX_ORDER; i++) {
+			struct list_head *list;
+			struct page *page, *buddy_page;
+
+			if (list_empty(&ns->free_area[i]))
+				continue;
+
+			list = ns->free_area[i].next;
+			page = container_of((void *)list, struct page, zone_device_data);
+
+			list_del(list);
+
+			while (i != order) {
+				buddy_page = nvm_vaddr_to_page(ns,
+					nvm_pgoff_to_vaddr(ns, page->index + (1 << (i - 1))));
+				set_page_private(buddy_page, i - 1);
+				buddy_page->index = page->index + (1 << (i - 1));
+				__SetPageBuddy(buddy_page);
+				list_add((struct list_head *)&buddy_page->zone_device_data,
+					&ns->free_area[i - 1]);
+				i--;
+			}
+
+			set_page_private(page, order);
+			__ClearPageBuddy(page);
+			ns->free -= 1 << order;
+			kaddr = nvm_pgoff_to_vaddr(ns, page->index);
+			break;
+		}
+
+		if (i != BCH_MAX_ORDER) {
+			pgalloc_recs = find_nvm_pgalloc_recs(ns, owner_head, true);
+			// ToDo: handle pgalloc_recs==NULL
+			add_pgalloc_rec(pgalloc_recs, kaddr, order);
+			break;
+		}
+	}
+
+	mutex_unlock(&only_set->lock);
+	return kaddr;
+}
+EXPORT_SYMBOL_GPL(bch_nvm_alloc_pages);
+
 static int init_owner_info(struct bch_nvm_namespace *ns)
 {
 	struct bch_owner_list_head *owner_list_head = ns->sb->owner_list_head;
diff --git a/drivers/md/bcache/nvm-pages.h b/drivers/md/bcache/nvm-pages.h
index c158033e24f0..b2c0e0cfac20 100644
--- a/drivers/md/bcache/nvm-pages.h
+++ b/drivers/md/bcache/nvm-pages.h
@@ -60,6 +60,7 @@ extern struct bch_nvm_set *only_set;
 struct bch_nvm_namespace *bch_register_namespace(const char *dev_path);
 int bch_nvm_init(void);
 void bch_nvm_exit(void);
+void *bch_nvm_alloc_pages(int order, const char *owner_uuid);
 
 #else
 
@@ -72,6 +73,11 @@ static inline int bch_nvm_init(void)
 }
 static inline void bch_nvm_exit(void) { }
 
+static inline void *bch_nvm_alloc_pages(int order, const char *owner_uuid)
+{
+	return NULL;
+}
+
 #endif /* CONFIG_BCACHE_NVM_PAGES */
 
 #endif /* _BCACHE_NVM_PAGES_H */
-- 
2.26.2
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^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH v7 05/16] bcache: bch_nvm_free_pages() of the buddy
  2021-04-09 16:43 [PATCH v7 00/16] bcache: support NVDIMM for journaling Coly Li
                   ` (3 preceding siblings ...)
  2021-04-09 16:43 ` [PATCH v7 04/16] bcache: bch_nvm_alloc_pages() " Coly Li
@ 2021-04-09 16:43 ` Coly Li
  2021-04-09 16:43 ` [PATCH v7 06/16] bcache: get allocated pages from specific owner Coly Li
                   ` (10 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: Coly Li @ 2021-04-09 16:43 UTC (permalink / raw)
  To: linux-bcache
  Cc: linux-block, linux-nvdimm, axboe, jianpeng.ma, qiaowei.ren, hare, jack

From: Jianpeng Ma <jianpeng.ma@intel.com>

This patch implements the bch_nvm_free_pages() of the buddy.

Signed-off-by: Jianpeng Ma <jianpeng.ma@intel.com>
Co-authored-by: Qiaowei Ren <qiaowei.ren@intel.com>
---
 drivers/md/bcache/nvm-pages.c | 158 +++++++++++++++++++++++++++++++++-
 drivers/md/bcache/nvm-pages.h |   3 +
 2 files changed, 157 insertions(+), 4 deletions(-)

diff --git a/drivers/md/bcache/nvm-pages.c b/drivers/md/bcache/nvm-pages.c
index 6bdc7d3773de..e576b4cb4850 100644
--- a/drivers/md/bcache/nvm-pages.c
+++ b/drivers/md/bcache/nvm-pages.c
@@ -166,6 +166,155 @@ static void add_pgalloc_rec(struct bch_nvm_pgalloc_recs *recs, void *kaddr, int
 	BUG_ON(i == recs->size);
 }
 
+static inline void *nvm_end_addr(struct bch_nvm_namespace *ns)
+{
+	return ns->kaddr + (ns->pages_total << PAGE_SHIFT);
+}
+
+static inline bool in_nvm_range(struct bch_nvm_namespace *ns,
+		void *start_addr, void *end_addr)
+{
+	return (start_addr >= ns->kaddr) && (end_addr <= nvm_end_addr(ns));
+}
+
+static struct bch_nvm_namespace *find_nvm_by_addr(void *addr, int order)
+{
+	int i;
+	struct bch_nvm_namespace *ns;
+
+	for (i = 0; i < only_set->total_namespaces_nr; i++) {
+		ns = only_set->nss[i];
+		if (ns && in_nvm_range(ns, addr, addr + (1 << order)))
+			return ns;
+	}
+	return NULL;
+}
+
+static int remove_pgalloc_rec(struct bch_nvm_pgalloc_recs *pgalloc_recs, int ns_nr,
+				void *kaddr, int order)
+{
+	struct bch_nvm_pages_owner_head *owner_head = pgalloc_recs->owner;
+	struct bch_nvm_pgalloc_recs *prev_recs, *sys_recs;
+	u64 pgoff = (unsigned long)kaddr >> PAGE_SHIFT;
+	struct bch_nvm_namespace *ns = only_set->nss[0];
+	int i;
+
+	prev_recs = pgalloc_recs;
+	sys_recs = ns->kaddr + BCH_NVM_PAGES_SYS_RECS_HEAD_OFFSET;
+	while (pgalloc_recs) {
+		for (i = 0; i < pgalloc_recs->size; i++) {
+			struct bch_pgalloc_rec *rec = &(pgalloc_recs->recs[i]);
+
+			if (rec->pgoff == pgoff) {
+				WARN_ON(rec->order != order);
+				rec->pgoff = 0;
+				rec->order = 0;
+				pgalloc_recs->used--;
+
+				if (pgalloc_recs->used == 0) {
+					int recs_pos = pgalloc_recs - sys_recs;
+
+					if (pgalloc_recs == prev_recs)
+						owner_head->recs[ns_nr] = pgalloc_recs->next;
+					else
+						prev_recs->next = pgalloc_recs->next;
+
+					pgalloc_recs->next = NULL;
+					pgalloc_recs->owner = NULL;
+
+					bitmap_clear(ns->pgalloc_recs_bitmap, recs_pos, 1);
+				}
+				goto exit;
+			}
+		}
+		prev_recs = pgalloc_recs;
+		pgalloc_recs = pgalloc_recs->next;
+	}
+exit:
+	return pgalloc_recs ? 0 : -ENOENT;
+}
+
+static void __free_space(struct bch_nvm_namespace *ns, void *addr, int order)
+{
+	unsigned int add_pages = (1 << order);
+	pgoff_t pgoff;
+	struct page *page;
+
+	page = nvm_vaddr_to_page(ns, addr);
+	WARN_ON((!page) || (page->private != order));
+	pgoff = page->index;
+
+	while (order < BCH_MAX_ORDER - 1) {
+		struct page *buddy_page;
+
+		pgoff_t buddy_pgoff = pgoff ^ (1 << order);
+		pgoff_t parent_pgoff = pgoff & ~(1 << order);
+
+		if ((parent_pgoff + (1 << (order + 1)) > ns->pages_total))
+			break;
+
+		buddy_page = nvm_vaddr_to_page(ns, nvm_pgoff_to_vaddr(ns, buddy_pgoff));
+		WARN_ON(!buddy_page);
+
+		if (PageBuddy(buddy_page) && (buddy_page->private == order)) {
+			list_del((struct list_head *)&buddy_page->zone_device_data);
+			__ClearPageBuddy(buddy_page);
+			pgoff = parent_pgoff;
+			order++;
+			continue;
+		}
+		break;
+	}
+
+	page = nvm_vaddr_to_page(ns, nvm_pgoff_to_vaddr(ns, pgoff));
+	WARN_ON(!page);
+	list_add((struct list_head *)&page->zone_device_data, &ns->free_area[order]);
+	page->index = pgoff;
+	set_page_private(page, order);
+	__SetPageBuddy(page);
+	ns->free += add_pages;
+}
+
+void bch_nvm_free_pages(void *addr, int order, const char *owner_uuid)
+{
+	struct bch_nvm_namespace *ns;
+	struct bch_nvm_pages_owner_head *owner_head;
+	struct bch_nvm_pgalloc_recs *pgalloc_recs;
+	int r;
+
+	mutex_lock(&only_set->lock);
+
+	ns = find_nvm_by_addr(addr, order);
+	if (!ns) {
+		pr_info("can't find nvm_dev by kaddr %p\n", addr);
+		goto unlock;
+	}
+
+	owner_head = find_owner_head(owner_uuid, false);
+	if (!owner_head) {
+		pr_info("can't found bch_nvm_pages_owner_head by(uuid=%s)\n", owner_uuid);
+		goto unlock;
+	}
+
+	pgalloc_recs = find_nvm_pgalloc_recs(ns, owner_head, false);
+	if (!pgalloc_recs) {
+		pr_info("can't find bch_nvm_pgalloc_recs by(uuid=%s)\n", owner_uuid);
+		goto unlock;
+	}
+
+	r = remove_pgalloc_rec(pgalloc_recs, ns->sb->this_namespace_nr, addr, order);
+	if (r < 0) {
+		pr_info("can't find bch_pgalloc_rec\n");
+		goto unlock;
+	}
+
+	__free_space(ns, addr, order);
+
+unlock:
+	mutex_unlock(&only_set->lock);
+}
+EXPORT_SYMBOL_GPL(bch_nvm_free_pages);
+
 void *bch_nvm_alloc_pages(int order, const char *owner_uuid)
 {
 	void *kaddr = NULL;
@@ -302,7 +451,7 @@ static void init_nvm_free_space(struct bch_nvm_namespace *ns)
 {
 	unsigned int start, end, i;
 	struct page *page;
-	long long pages;
+	u64 pages;
 	pgoff_t pgoff_start;
 
 	bitmap_for_each_clear_region(ns->pages_bitmap, start, end, 0, ns->pages_total) {
@@ -318,8 +467,9 @@ static void init_nvm_free_space(struct bch_nvm_namespace *ns)
 			page = nvm_vaddr_to_page(ns, nvm_pgoff_to_vaddr(ns, pgoff_start));
 			page->index = pgoff_start;
 			set_page_private(page, i);
-			__SetPageBuddy(page);
-			list_add((struct list_head *)&page->zone_device_data, &ns->free_area[i]);
+
+			/* in order to update ns->free */
+			__free_space(ns, nvm_pgoff_to_vaddr(ns, pgoff_start), i);
 
 			pgoff_start += 1 << i;
 			pages -= 1 << i;
@@ -499,7 +649,7 @@ struct bch_nvm_namespace *bch_register_namespace(const char *dev_path)
 	ns->page_size = ns->sb->page_size;
 	ns->pages_offset = ns->sb->pages_offset;
 	ns->pages_total = ns->sb->pages_total;
-	ns->free = 0;
+	ns->free = 0; /* increase by __free_space() */
 	ns->bdev = bdev;
 	ns->nvm_set = only_set;
 	mutex_init(&ns->lock);
diff --git a/drivers/md/bcache/nvm-pages.h b/drivers/md/bcache/nvm-pages.h
index b2c0e0cfac20..4ea831894583 100644
--- a/drivers/md/bcache/nvm-pages.h
+++ b/drivers/md/bcache/nvm-pages.h
@@ -61,6 +61,7 @@ struct bch_nvm_namespace *bch_register_namespace(const char *dev_path);
 int bch_nvm_init(void);
 void bch_nvm_exit(void);
 void *bch_nvm_alloc_pages(int order, const char *owner_uuid);
+void bch_nvm_free_pages(void *addr, int order, const char *owner_uuid);
 
 #else
 
@@ -78,6 +79,8 @@ static inline void *bch_nvm_alloc_pages(int order, const char *owner_uuid)
 	return NULL;
 }
 
+static inline void bch_nvm_free_pages(void *addr, int order, const char *owner_uuid) { }
+
 #endif /* CONFIG_BCACHE_NVM_PAGES */
 
 #endif /* _BCACHE_NVM_PAGES_H */
-- 
2.26.2
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To unsubscribe send an email to linux-nvdimm-leave@lists.01.org

^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH v7 06/16] bcache: get allocated pages from specific owner
  2021-04-09 16:43 [PATCH v7 00/16] bcache: support NVDIMM for journaling Coly Li
                   ` (4 preceding siblings ...)
  2021-04-09 16:43 ` [PATCH v7 05/16] bcache: bch_nvm_free_pages() " Coly Li
@ 2021-04-09 16:43 ` Coly Li
  2021-04-09 16:43 ` [PATCH v7 07/16] bcache: nvm-pages fixes for bcache integration testing Coly Li
                   ` (9 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: Coly Li @ 2021-04-09 16:43 UTC (permalink / raw)
  To: linux-bcache
  Cc: linux-block, linux-nvdimm, axboe, jianpeng.ma, qiaowei.ren, hare, jack

From: Jianpeng Ma <jianpeng.ma@intel.com>

This patch implements bch_get_allocated_pages() of the buddy to be used to
get allocated pages from specific owner.

Signed-off-by: Jianpeng Ma <jianpeng.ma@intel.com>
Co-authored-by: Qiaowei Ren <qiaowei.ren@intel.com>
---
 drivers/md/bcache/nvm-pages.c | 6 ++++++
 drivers/md/bcache/nvm-pages.h | 7 ++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/md/bcache/nvm-pages.c b/drivers/md/bcache/nvm-pages.c
index e576b4cb4850..2ba02091bccf 100644
--- a/drivers/md/bcache/nvm-pages.c
+++ b/drivers/md/bcache/nvm-pages.c
@@ -374,6 +374,12 @@ void *bch_nvm_alloc_pages(int order, const char *owner_uuid)
 }
 EXPORT_SYMBOL_GPL(bch_nvm_alloc_pages);
 
+struct bch_nvm_pages_owner_head *bch_get_allocated_pages(const char *owner_uuid)
+{
+	return find_owner_head(owner_uuid, false);
+}
+EXPORT_SYMBOL_GPL(bch_get_allocated_pages);
+
 static int init_owner_info(struct bch_nvm_namespace *ns)
 {
 	struct bch_owner_list_head *owner_list_head = ns->sb->owner_list_head;
diff --git a/drivers/md/bcache/nvm-pages.h b/drivers/md/bcache/nvm-pages.h
index 4ea831894583..87b1efc301c8 100644
--- a/drivers/md/bcache/nvm-pages.h
+++ b/drivers/md/bcache/nvm-pages.h
@@ -62,7 +62,7 @@ int bch_nvm_init(void);
 void bch_nvm_exit(void);
 void *bch_nvm_alloc_pages(int order, const char *owner_uuid);
 void bch_nvm_free_pages(void *addr, int order, const char *owner_uuid);
-
+struct bch_nvm_pages_owner_head *bch_get_allocated_pages(const char *owner_uuid);
 #else
 
 static inline struct bch_nvm_namespace *bch_register_namespace(const char *dev_path)
@@ -81,6 +81,11 @@ static inline void *bch_nvm_alloc_pages(int order, const char *owner_uuid)
 
 static inline void bch_nvm_free_pages(void *addr, int order, const char *owner_uuid) { }
 
+static inline struct bch_nvm_pages_owner_head *bch_get_allocated_pages(const char *owner_uuid)
+{
+	return NULL;
+}
+
 #endif /* CONFIG_BCACHE_NVM_PAGES */
 
 #endif /* _BCACHE_NVM_PAGES_H */
-- 
2.26.2
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^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH v7 07/16] bcache: nvm-pages fixes for bcache integration testing
  2021-04-09 16:43 [PATCH v7 00/16] bcache: support NVDIMM for journaling Coly Li
                   ` (5 preceding siblings ...)
  2021-04-09 16:43 ` [PATCH v7 06/16] bcache: get allocated pages from specific owner Coly Li
@ 2021-04-09 16:43 ` 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
                   ` (8 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: Coly Li @ 2021-04-09 16:43 UTC (permalink / raw)
  To: linux-bcache
  Cc: linux-block, linux-nvdimm, axboe, jianpeng.ma, qiaowei.ren, hare,
	jack, Coly Li

There are two minor fixes in nvm-pages code, which can be added in next
nvm-pages series. Then I can drop this patch.

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/nvm-pages.c | 29 +++++++++++++++++++++--------
 drivers/md/bcache/nvm-pages.h |  1 +
 2 files changed, 22 insertions(+), 8 deletions(-)

diff --git a/drivers/md/bcache/nvm-pages.c b/drivers/md/bcache/nvm-pages.c
index 2ba02091bccf..c3ab396a45fa 100644
--- a/drivers/md/bcache/nvm-pages.c
+++ b/drivers/md/bcache/nvm-pages.c
@@ -73,24 +73,32 @@ static inline void remove_owner_space(struct bch_nvm_namespace *ns,
 static struct bch_nvm_pages_owner_head *find_owner_head(const char *owner_uuid, bool create)
 {
 	struct bch_owner_list_head *owner_list_head = only_set->owner_list_head;
+	struct bch_nvm_pages_owner_head *owner_head = NULL;
 	int i;
 
+	if (owner_list_head == NULL)
+		goto out;
+
 	for (i = 0; i < only_set->owner_list_used; i++) {
-		if (!memcmp(owner_uuid, owner_list_head->heads[i].uuid, 16))
-			return &(owner_list_head->heads[i]);
+		if (!memcmp(owner_uuid, owner_list_head->heads[i].uuid, 16)) {
+			owner_head = &(owner_list_head->heads[i]);
+			break;
+		}
 	}
 
-	if (create) {
+	if (!owner_head && create) {
 		int used = only_set->owner_list_used;
 
-		BUG_ON(only_set->owner_list_size == used);
-		memcpy(owner_list_head->heads[used].uuid, owner_uuid, 16);
+		BUG_ON((used > 0) && (only_set->owner_list_size == used));
+		memcpy_flushcache(owner_list_head->heads[used].uuid, owner_uuid, 16);
 		only_set->owner_list_used++;
 
 		owner_list_head->used++;
-		return &(owner_list_head->heads[used]);
-	} else
-		return NULL;
+		owner_head = &(owner_list_head->heads[used]);
+	}
+
+out:
+	return owner_head;
 }
 
 static struct bch_nvm_pgalloc_recs *find_empty_pgalloc_recs(void)
@@ -324,6 +332,10 @@ void *bch_nvm_alloc_pages(int order, const char *owner_uuid)
 
 	mutex_lock(&only_set->lock);
 	owner_head = find_owner_head(owner_uuid, true);
+	if (!owner_head) {
+		pr_err("can't find bch_nvm_pgalloc_recs by(uuid=%s)\n", owner_uuid);
+		goto unlock;
+	}
 
 	for (j = 0; j < only_set->total_namespaces_nr; j++) {
 		struct bch_nvm_namespace *ns = only_set->nss[j];
@@ -369,6 +381,7 @@ void *bch_nvm_alloc_pages(int order, const char *owner_uuid)
 		}
 	}
 
+unlock:
 	mutex_unlock(&only_set->lock);
 	return kaddr;
 }
diff --git a/drivers/md/bcache/nvm-pages.h b/drivers/md/bcache/nvm-pages.h
index 87b1efc301c8..b8a5cd0890d3 100644
--- a/drivers/md/bcache/nvm-pages.h
+++ b/drivers/md/bcache/nvm-pages.h
@@ -66,6 +66,7 @@ struct bch_nvm_pages_owner_head *bch_get_allocated_pages(const char *owner_uuid)
 #else
 
 static inline struct bch_nvm_namespace *bch_register_namespace(const char *dev_path)
+{
 	return NULL;
 }
 static inline int bch_nvm_init(void)
-- 
2.26.2
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^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH v7 08/16] bcache: use bucket index to set GC_MARK_METADATA for journal buckets in bch_btree_gc_finish()
  2021-04-09 16:43 [PATCH v7 00/16] bcache: support NVDIMM for journaling Coly Li
                   ` (6 preceding siblings ...)
  2021-04-09 16:43 ` [PATCH v7 07/16] bcache: nvm-pages fixes for bcache integration testing Coly Li
@ 2021-04-09 16:43 ` Coly Li
  2021-04-09 16:43 ` [PATCH v7 09/16] bcache: add BCH_FEATURE_INCOMPAT_NVDIMM_META into incompat feature set Coly Li
                   ` (7 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: Coly Li @ 2021-04-09 16:43 UTC (permalink / raw)
  To: linux-bcache
  Cc: linux-block, linux-nvdimm, axboe, jianpeng.ma, qiaowei.ren, hare,
	jack, Coly Li

Currently the meta data bucket locations on cache device are reserved
after the meta data stored on NVDIMM pages, for the meta data layout
consistentcy temporarily. So these buckets are still marked as meta data
by SET_GC_MARK() in bch_btree_gc_finish().

When BCH_FEATURE_INCOMPAT_NVDIMM_META is set, the sb.d[] stores linear
address of NVDIMM pages and not bucket index anymore. Therefore we
should avoid to find bucket index from sb.d[], and directly use bucket
index from ca->sb.first_bucket to (ca->sb.first_bucket +
ca->sb.njournal_bucketsi) for setting the gc mark of journal bucket.

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/btree.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c
index fe6dce125aba..28edd884bd5d 100644
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -1761,8 +1761,10 @@ static void bch_btree_gc_finish(struct cache_set *c)
 	ca = c->cache;
 	ca->invalidate_needs_gc = 0;
 
-	for (k = ca->sb.d; k < ca->sb.d + ca->sb.keys; k++)
-		SET_GC_MARK(ca->buckets + *k, GC_MARK_METADATA);
+	/* Range [first_bucket, first_bucket + keys) is for journal buckets */
+	for (i = ca->sb.first_bucket;
+	     i < ca->sb.first_bucket + ca->sb.njournal_buckets; i++)
+		SET_GC_MARK(ca->buckets + i, GC_MARK_METADATA);
 
 	for (k = ca->prio_buckets;
 	     k < ca->prio_buckets + prio_buckets(ca) * 2; k++)
-- 
2.26.2
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^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH v7 09/16] bcache: add BCH_FEATURE_INCOMPAT_NVDIMM_META into incompat feature set
  2021-04-09 16:43 [PATCH v7 00/16] bcache: support NVDIMM for journaling Coly Li
                   ` (7 preceding siblings ...)
  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 ` Coly Li
  2021-04-09 16:43 ` [PATCH v7 10/16] bcache: initialize bcache journal for NVDIMM meta device Coly Li
                   ` (6 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: Coly Li @ 2021-04-09 16:43 UTC (permalink / raw)
  To: linux-bcache
  Cc: linux-block, linux-nvdimm, axboe, jianpeng.ma, qiaowei.ren, hare,
	jack, Coly Li

This patch adds BCH_FEATURE_INCOMPAT_NVDIMM_META (value 0x0004) into the
incompat feature set. When this bit is set by bcache-tools, it indicates
bcache meta data should be stored on specific NVDIMM meta device.

The bcache meta data mainly includes journal and btree nodes, when this
bit is set in incompat feature set, bcache will ask the nvm-pages
allocator for NVDIMM space to store the meta data.

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/features.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/md/bcache/features.h b/drivers/md/bcache/features.h
index d1c8fd3977fc..333fb5efb6bd 100644
--- a/drivers/md/bcache/features.h
+++ b/drivers/md/bcache/features.h
@@ -17,11 +17,19 @@
 #define BCH_FEATURE_INCOMPAT_OBSO_LARGE_BUCKET		0x0001
 /* real bucket size is (1 << bucket_size) */
 #define BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE	0x0002
+/* store bcache meta data on nvdimm */
+#define BCH_FEATURE_INCOMPAT_NVDIMM_META		0x0004
 
 #define BCH_FEATURE_COMPAT_SUPP		0
 #define BCH_FEATURE_RO_COMPAT_SUPP	0
+#ifdef CONFIG_BCACHE_NVM_PAGES
+#define BCH_FEATURE_INCOMPAT_SUPP	(BCH_FEATURE_INCOMPAT_OBSO_LARGE_BUCKET| \
+					 BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE| \
+					 BCH_FEATURE_INCOMPAT_NVDIMM_META)
+#else
 #define BCH_FEATURE_INCOMPAT_SUPP	(BCH_FEATURE_INCOMPAT_OBSO_LARGE_BUCKET| \
 					 BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE)
+#endif
 
 #define BCH_HAS_COMPAT_FEATURE(sb, mask) \
 		((sb)->feature_compat & (mask))
@@ -89,6 +97,7 @@ static inline void bch_clear_feature_##name(struct cache_sb *sb) \
 
 BCH_FEATURE_INCOMPAT_FUNCS(obso_large_bucket, OBSO_LARGE_BUCKET);
 BCH_FEATURE_INCOMPAT_FUNCS(large_bucket, LOG_LARGE_BUCKET_SIZE);
+BCH_FEATURE_INCOMPAT_FUNCS(nvdimm_meta, NVDIMM_META);
 
 static inline bool bch_has_unknown_compat_features(struct cache_sb *sb)
 {
-- 
2.26.2
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^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH v7 10/16] bcache: initialize bcache journal for NVDIMM meta device
  2021-04-09 16:43 [PATCH v7 00/16] bcache: support NVDIMM for journaling Coly Li
                   ` (8 preceding siblings ...)
  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 ` Coly Li
  2021-04-09 16:43 ` [PATCH v7 11/16] bcache: support storing bcache journal into " Coly Li
                   ` (5 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: Coly Li @ 2021-04-09 16:43 UTC (permalink / raw)
  To: linux-bcache
  Cc: linux-block, linux-nvdimm, axboe, jianpeng.ma, qiaowei.ren, hare,
	jack, Coly Li

The nvm-pages allocator may store and index the NVDIMM pages allocated
for bcache journal. This patch adds the initialization to store bcache
journal space on NVDIMM pages if BCH_FEATURE_INCOMPAT_NVDIMM_META bit is
set by bcache-tools.

If BCH_FEATURE_INCOMPAT_NVDIMM_META is set, get_nvdimm_journal_space()
will return the linear address of NVDIMM pages for bcache journal,
- If there is previously allocated space, find it from nvm-pages owner
  list and return to bch_journal_init().
- If there is no previously allocated space, require a new NVDIMM range
  from the nvm-pages allocator, and return it to bch_journal_init().

And in bch_journal_init(), keys in sb.d[] store the corresponding linear
address from NVDIMM into sb.d[i].ptr[0] where 'i' is the bucket index to
iterate all journal buckets.

Later when bcache journaling code stores the journaling jset, the target
NVDIMM linear address stored (and updated) in sb.d[i].ptr[0] can be used
directly in memory copy from DRAM pages into NVDIMM pages.

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/journal.c | 105 ++++++++++++++++++++++++++++++++++++
 drivers/md/bcache/journal.h |   2 +-
 drivers/md/bcache/super.c   |  16 +++---
 3 files changed, 115 insertions(+), 8 deletions(-)

diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c
index c6613e817333..acbfd4ec88af 100644
--- a/drivers/md/bcache/journal.c
+++ b/drivers/md/bcache/journal.c
@@ -9,6 +9,8 @@
 #include "btree.h"
 #include "debug.h"
 #include "extents.h"
+#include "nvm-pages.h"
+#include "features.h"
 
 #include <trace/events/bcache.h>
 
@@ -982,3 +984,106 @@ int bch_journal_alloc(struct cache_set *c)
 
 	return 0;
 }
+
+#ifdef CONFIG_BCACHE_NVM_PAGES
+
+static void *find_journal_nvm_base(struct bch_nvm_pages_owner_head *owner_list,
+				   struct cache *ca)
+{
+	unsigned long addr = 0;
+	struct bch_nvm_pgalloc_recs *recs_list = owner_list->recs[0];
+
+	while (recs_list) {
+		struct bch_pgalloc_rec *rec;
+		unsigned long jnl_pgoff;
+		int i;
+
+		jnl_pgoff = ((unsigned long)ca->sb.d[0]) >> PAGE_SHIFT;
+		rec = recs_list->recs;
+		for (i = 0; i < recs_list->used; i++) {
+			if (rec->pgoff == jnl_pgoff)
+				break;
+			rec++;
+		}
+		if (i < recs_list->used) {
+			addr = rec->pgoff << PAGE_SHIFT;
+			break;
+		}
+		recs_list = recs_list->next;
+	}
+	return (void *)addr;
+}
+
+static void *get_nvdimm_journal_space(struct cache *ca)
+{
+	struct bch_nvm_pages_owner_head *owner_list = NULL;
+	void *ret = NULL;
+	int order;
+
+	owner_list = bch_get_allocated_pages(ca->sb.set_uuid);
+	if (owner_list) {
+		ret = find_journal_nvm_base(owner_list, ca);
+		if (ret)
+			goto found;
+	}
+
+	order = ilog2(ca->sb.bucket_size *
+		      ca->sb.njournal_buckets / PAGE_SECTORS);
+	ret = bch_nvm_alloc_pages(order, ca->sb.set_uuid);
+	if (ret)
+		memset(ret, 0, (1 << order) * PAGE_SIZE);
+
+found:
+	return ret;
+}
+
+static int __bch_journal_nvdimm_init(struct cache *ca)
+{
+	int i, ret = 0;
+	void *journal_nvm_base = NULL;
+
+	journal_nvm_base = get_nvdimm_journal_space(ca);
+	if (!journal_nvm_base) {
+		pr_err("Failed to get journal space from nvdimm\n");
+		ret = -1;
+		goto out;
+	}
+
+	/* Iniialized and reloaded from on-disk super block already */
+	if (ca->sb.d[0] != 0)
+		goto out;
+
+	for (i = 0; i < ca->sb.keys; i++)
+		ca->sb.d[i] =
+			(u64)(journal_nvm_base + (ca->sb.bucket_size * i));
+
+out:
+	return ret;
+}
+
+#else /* CONFIG_BCACHE_NVM_PAGES */
+
+static int __bch_journal_nvdimm_init(struct cache *ca)
+{
+	return -1;
+}
+
+#endif /* CONFIG_BCACHE_NVM_PAGES */
+
+int bch_journal_init(struct cache_set *c)
+{
+	int i, ret = 0;
+	struct cache *ca = c->cache;
+
+	ca->sb.keys = clamp_t(int, ca->sb.nbuckets >> 7,
+				2, SB_JOURNAL_BUCKETS);
+
+	if (!bch_has_feature_nvdimm_meta(&ca->sb)) {
+		for (i = 0; i < ca->sb.keys; i++)
+			ca->sb.d[i] = ca->sb.first_bucket + i;
+	} else {
+		ret = __bch_journal_nvdimm_init(ca);
+	}
+
+	return ret;
+}
diff --git a/drivers/md/bcache/journal.h b/drivers/md/bcache/journal.h
index f2ea34d5f431..e3a7fa5a8fda 100644
--- a/drivers/md/bcache/journal.h
+++ b/drivers/md/bcache/journal.h
@@ -179,7 +179,7 @@ void bch_journal_mark(struct cache_set *c, struct list_head *list);
 void bch_journal_meta(struct cache_set *c, struct closure *cl);
 int bch_journal_read(struct cache_set *c, struct list_head *list);
 int bch_journal_replay(struct cache_set *c, struct list_head *list);
-
+int bch_journal_init(struct cache_set *c);
 void bch_journal_free(struct cache_set *c);
 int bch_journal_alloc(struct cache_set *c);
 
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 0674a76d9454..144e7d0cc9a6 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -146,10 +146,15 @@ static const char *read_super_common(struct cache_sb *sb,  struct block_device *
 		goto err;
 
 	err = "Journal buckets not sequential";
+#ifdef CONFIG_BCACHE_NVM_PAGES
+	if (!bch_has_feature_nvdimm_meta(sb)) {
+#endif
 	for (i = 0; i < sb->keys; i++)
 		if (sb->d[i] != sb->first_bucket + i)
 			goto err;
-
+#ifdef CONFIG_BCACHE_NVM_PAGES
+	} /* bch_has_feature_nvdimm_meta */
+#endif
 	err = "Too many journal buckets";
 	if (sb->first_bucket + sb->keys > sb->nbuckets)
 		goto err;
@@ -2072,14 +2077,11 @@ static int run_cache_set(struct cache_set *c)
 		if (bch_journal_replay(c, &journal))
 			goto err;
 	} else {
-		unsigned int j;
-
 		pr_notice("invalidating existing data\n");
-		ca->sb.keys = clamp_t(int, ca->sb.nbuckets >> 7,
-					2, SB_JOURNAL_BUCKETS);
 
-		for (j = 0; j < ca->sb.keys; j++)
-			ca->sb.d[j] = ca->sb.first_bucket + j;
+		err = "error initializing journal";
+		if (bch_journal_init(c))
+			goto err;
 
 		bch_initial_gc_finish(c);
 
-- 
2.26.2
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^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH v7 11/16] bcache: support storing bcache journal into NVDIMM meta device
  2021-04-09 16:43 [PATCH v7 00/16] bcache: support NVDIMM for journaling Coly Li
                   ` (9 preceding siblings ...)
  2021-04-09 16:43 ` [PATCH v7 10/16] bcache: initialize bcache journal for NVDIMM meta device Coly Li
@ 2021-04-09 16:43 ` Coly Li
  2021-04-09 16:43 ` [PATCH v7 12/16] bcache: read jset from NVDIMM pages for journal replay Coly Li
                   ` (4 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: Coly Li @ 2021-04-09 16:43 UTC (permalink / raw)
  To: linux-bcache
  Cc: linux-block, linux-nvdimm, axboe, jianpeng.ma, qiaowei.ren, hare,
	jack, Coly Li

This patch implements two methods to store bcache journal to,
1) __journal_write_unlocked() for block interface device
   The latency method to compose bio and issue the jset bio to cache
   device (e.g. SSD). c->journal.key.ptr[0] indicates the LBA on cache
   device to store the journal jset.
2) __journal_nvdimm_write_unlocked() for memory interface NVDIMM
   Use memory interface to access NVDIMM pages and store the jset by
   memcpy_flushcache(). c->journal.key.ptr[0] indicates the linear
   address from the NVDIMM pages to store the journal jset.

For lagency configuration without NVDIMM meta device, journal I/O is
handled by __journal_write_unlocked() with existing code logic. If the
NVDIMM meta device is used (by bcache-tools), the journal I/O will
be handled by __journal_nvdimm_write_unlocked() and go into the NVDIMM
pages.

And when NVDIMM meta device is used, sb.d[] stores the linear addresses
from NVDIMM pages (no more bucket index), in journal_reclaim() the
journaling location in c->journal.key.ptr[0] should also be updated by
linear address from NVDIMM pages (no more LBA combined by sectors offset
and bucket index).

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/journal.c   | 119 ++++++++++++++++++++++++----------
 drivers/md/bcache/nvm-pages.h |   1 +
 drivers/md/bcache/super.c     |  25 ++++++-
 3 files changed, 107 insertions(+), 38 deletions(-)

diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c
index acbfd4ec88af..9a542e6c2152 100644
--- a/drivers/md/bcache/journal.c
+++ b/drivers/md/bcache/journal.c
@@ -596,6 +596,8 @@ static void do_journal_discard(struct cache *ca)
 		return;
 	}
 
+	BUG_ON(bch_has_feature_nvdimm_meta(&ca->sb));
+
 	switch (atomic_read(&ja->discard_in_flight)) {
 	case DISCARD_IN_FLIGHT:
 		return;
@@ -661,9 +663,13 @@ static void journal_reclaim(struct cache_set *c)
 		goto out;
 
 	ja->cur_idx = next;
-	k->ptr[0] = MAKE_PTR(0,
-			     bucket_to_sector(c, ca->sb.d[ja->cur_idx]),
-			     ca->sb.nr_this_dev);
+	if (!bch_has_feature_nvdimm_meta(&ca->sb))
+		k->ptr[0] = MAKE_PTR(0,
+			bucket_to_sector(c, ca->sb.d[ja->cur_idx]),
+			ca->sb.nr_this_dev);
+	else
+		k->ptr[0] = ca->sb.d[ja->cur_idx];
+
 	atomic_long_inc(&c->reclaimed_journal_buckets);
 
 	bkey_init(k);
@@ -729,46 +735,21 @@ static void journal_write_unlock(struct closure *cl)
 	spin_unlock(&c->journal.lock);
 }
 
-static void journal_write_unlocked(struct closure *cl)
+
+static void __journal_write_unlocked(struct cache_set *c)
 	__releases(c->journal.lock)
 {
-	struct cache_set *c = container_of(cl, struct cache_set, journal.io);
-	struct cache *ca = c->cache;
-	struct journal_write *w = c->journal.cur;
 	struct bkey *k = &c->journal.key;
-	unsigned int i, sectors = set_blocks(w->data, block_bytes(ca)) *
-		ca->sb.block_size;
-
+	struct journal_write *w = c->journal.cur;
+	struct closure *cl = &c->journal.io;
+	struct cache *ca = c->cache;
 	struct bio *bio;
 	struct bio_list list;
+	unsigned int i, sectors = set_blocks(w->data, block_bytes(ca)) *
+		ca->sb.block_size;
 
 	bio_list_init(&list);
 
-	if (!w->need_write) {
-		closure_return_with_destructor(cl, journal_write_unlock);
-		return;
-	} else if (journal_full(&c->journal)) {
-		journal_reclaim(c);
-		spin_unlock(&c->journal.lock);
-
-		btree_flush_write(c);
-		continue_at(cl, journal_write, bch_journal_wq);
-		return;
-	}
-
-	c->journal.blocks_free -= set_blocks(w->data, block_bytes(ca));
-
-	w->data->btree_level = c->root->level;
-
-	bkey_copy(&w->data->btree_root, &c->root->key);
-	bkey_copy(&w->data->uuid_bucket, &c->uuid_bucket);
-
-	w->data->prio_bucket[ca->sb.nr_this_dev] = ca->prio_buckets[0];
-	w->data->magic		= jset_magic(&ca->sb);
-	w->data->version	= BCACHE_JSET_VERSION;
-	w->data->last_seq	= last_seq(&c->journal);
-	w->data->csum		= csum_set(w->data);
-
 	for (i = 0; i < KEY_PTRS(k); i++) {
 		ca = PTR_CACHE(c, k, i);
 		bio = &ca->journal.bio;
@@ -793,7 +774,6 @@ static void journal_write_unlocked(struct closure *cl)
 
 		ca->journal.seq[ca->journal.cur_idx] = w->data->seq;
 	}
-
 	/* If KEY_PTRS(k) == 0, this jset gets lost in air */
 	BUG_ON(i == 0);
 
@@ -805,6 +785,73 @@ static void journal_write_unlocked(struct closure *cl)
 
 	while ((bio = bio_list_pop(&list)))
 		closure_bio_submit(c, bio, cl);
+}
+
+#ifdef CONFIG_BCACHE_NVM_PAGES
+
+static void __journal_nvdimm_write_unlocked(struct cache_set *c)
+	__releases(c->journal.lock)
+{
+	struct journal_write *w = c->journal.cur;
+	struct cache *ca = c->cache;
+	unsigned int sectors;
+
+	sectors = set_blocks(w->data, block_bytes(ca)) * ca->sb.block_size;
+	atomic_long_add(sectors, &ca->meta_sectors_written);
+
+	memcpy_flushcache((void *)c->journal.key.ptr[0], w->data, sectors << 9);
+
+	c->journal.key.ptr[0] += sectors << 9;
+	ca->journal.seq[ca->journal.cur_idx] = w->data->seq;
+
+	atomic_dec_bug(&fifo_back(&c->journal.pin));
+	bch_journal_next(&c->journal);
+	journal_reclaim(c);
+
+	spin_unlock(&c->journal.lock);
+}
+
+#else /* CONFIG_BCACHE_NVM_PAGES */
+
+static void __journal_nvdimm_write_unlocked(struct cache_set *c) { }
+
+#endif /* CONFIG_BCACHE_NVM_PAGES */
+
+static void journal_write_unlocked(struct closure *cl)
+{
+	struct cache_set *c = container_of(cl, struct cache_set, journal.io);
+	struct cache *ca = c->cache;
+	struct journal_write *w = c->journal.cur;
+
+	if (!w->need_write) {
+		closure_return_with_destructor(cl, journal_write_unlock);
+		return;
+	} else if (journal_full(&c->journal)) {
+		journal_reclaim(c);
+		spin_unlock(&c->journal.lock);
+
+		btree_flush_write(c);
+		continue_at(cl, journal_write, bch_journal_wq);
+		return;
+	}
+
+	c->journal.blocks_free -= set_blocks(w->data, block_bytes(ca));
+
+	w->data->btree_level = c->root->level;
+
+	bkey_copy(&w->data->btree_root, &c->root->key);
+	bkey_copy(&w->data->uuid_bucket, &c->uuid_bucket);
+
+	w->data->prio_bucket[ca->sb.nr_this_dev] = ca->prio_buckets[0];
+	w->data->magic		= jset_magic(&ca->sb);
+	w->data->version	= BCACHE_JSET_VERSION;
+	w->data->last_seq	= last_seq(&c->journal);
+	w->data->csum		= csum_set(w->data);
+
+	if (!bch_has_feature_nvdimm_meta(&ca->sb))
+		__journal_write_unlocked(c);
+	else
+		__journal_nvdimm_write_unlocked(c);
 
 	continue_at(cl, journal_write_done, NULL);
 }
diff --git a/drivers/md/bcache/nvm-pages.h b/drivers/md/bcache/nvm-pages.h
index b8a5cd0890d3..1c4cbad0209f 100644
--- a/drivers/md/bcache/nvm-pages.h
+++ b/drivers/md/bcache/nvm-pages.h
@@ -4,6 +4,7 @@
 #define _BCACHE_NVM_PAGES_H
 
 #include <linux/bcache-nvm.h>
+#include <linux/libnvdimm.h>
 
 /*
  * Bcache NVDIMM in memory data structures
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 144e7d0cc9a6..9640bfb85571 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1686,7 +1686,29 @@ void bch_cache_set_release(struct kobject *kobj)
 static void cache_set_free(struct closure *cl)
 {
 	struct cache_set *c = container_of(cl, struct cache_set, cl);
-	struct cache *ca;
+	struct cache *ca = c->cache;
+
+#ifdef CONFIG_BCACHE_NVM_PAGES
+	/* Flush cache if journal stored in NVDIMM */
+	if (ca && bch_has_feature_nvdimm_meta(&ca->sb)) {
+		unsigned long bucket_size = ca->sb.bucket_size;
+		int i;
+
+		for (i = 0; i < ca->sb.keys; i++) {
+			unsigned long offset = 0;
+			unsigned int len = round_down(UINT_MAX, 2);
+
+			while (bucket_size > 0) {
+				if (len > bucket_size)
+					len = bucket_size;
+				arch_invalidate_pmem(
+					(void *)(ca->sb.d[i] + offset), len);
+				offset += len;
+				bucket_size -= len;
+			}
+		}
+	}
+#endif /* CONFIG_BCACHE_NVM_PAGES */
 
 	debugfs_remove(c->debug);
 
@@ -1698,7 +1720,6 @@ static void cache_set_free(struct closure *cl)
 	bch_bset_sort_state_free(&c->sort);
 	free_pages((unsigned long) c->uuids, ilog2(meta_bucket_pages(&c->cache->sb)));
 
-	ca = c->cache;
 	if (ca) {
 		ca->set = NULL;
 		c->cache = NULL;
-- 
2.26.2
_______________________________________________
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To unsubscribe send an email to linux-nvdimm-leave@lists.01.org

^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH v7 12/16] bcache: read jset from NVDIMM pages for journal replay
  2021-04-09 16:43 [PATCH v7 00/16] bcache: support NVDIMM for journaling Coly Li
                   ` (10 preceding siblings ...)
  2021-04-09 16:43 ` [PATCH v7 11/16] bcache: support storing bcache journal into " Coly Li
@ 2021-04-09 16:43 ` Coly Li
  2021-04-09 16:43 ` [PATCH v7 13/16] bcache: add sysfs interface register_nvdimm_meta to register NVDIMM meta device Coly Li
                   ` (3 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: Coly Li @ 2021-04-09 16:43 UTC (permalink / raw)
  To: linux-bcache
  Cc: linux-block, linux-nvdimm, axboe, jianpeng.ma, qiaowei.ren, hare,
	jack, Coly Li

This patch implements two methods to read jset from media for journal
replay,
- __jnl_rd_bkt() for block device
  This is the legacy method to read jset via block device interface.
- __jnl_rd_nvm_bkt() for NVDIMM
  This is the method to read jset from NVDIMM memory interface, a.k.a
  memcopy() from NVDIMM pages to DRAM pages.

If BCH_FEATURE_INCOMPAT_NVDIMM_META is set in incompat feature set,
during running cache set, journal_read_bucket() will read the journal
content from NVDIMM by __jnl_rd_nvm_bkt(). The linear addresses of
NVDIMM pages to read jset are stored in sb.d[SB_JOURNAL_BUCKETS], which
were initialized and maintained in previous runs of the cache set.

A thing should be noticed is, when bch_journal_read() is called, the
linear address of NVDIMM pages is not loaded and initialized yet, it
is necessary to call __bch_journal_nvdimm_init() before reading the jset
from NVDIMM pages.

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/journal.c | 93 +++++++++++++++++++++++++++----------
 1 file changed, 69 insertions(+), 24 deletions(-)

diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c
index 9a542e6c2152..4f09ad5b994b 100644
--- a/drivers/md/bcache/journal.c
+++ b/drivers/md/bcache/journal.c
@@ -34,60 +34,96 @@ static void journal_read_endio(struct bio *bio)
 	closure_put(cl);
 }
 
+static struct jset *__jnl_rd_bkt(struct cache *ca, unsigned int bkt_idx,
+				    unsigned int len, unsigned int offset,
+				    struct closure *cl)
+{
+	sector_t bucket = bucket_to_sector(ca->set, ca->sb.d[bkt_idx]);
+	struct bio *bio = &ca->journal.bio;
+	struct jset *data = ca->set->journal.w[0].data;
+
+	bio_reset(bio);
+	bio->bi_iter.bi_sector	= bucket + offset;
+	bio_set_dev(bio, ca->bdev);
+	bio->bi_iter.bi_size	= len << 9;
+	bio->bi_end_io	= journal_read_endio;
+	bio->bi_private = cl;
+	bio_set_op_attrs(bio, REQ_OP_READ, 0);
+	bch_bio_map(bio, data);
+
+	closure_bio_submit(ca->set, bio, cl);
+	closure_sync(cl);
+
+	/* Indeed journal.w[0].data */
+	return data;
+}
+
+#ifdef CONFIG_BCACHE_NVM_PAGES
+
+static struct jset *__jnl_rd_nvm_bkt(struct cache *ca, unsigned int bkt_idx,
+				     unsigned int len, unsigned int offset)
+{
+	void *jset_addr = (void *)ca->sb.d[bkt_idx] + (offset << 9);
+	struct jset *data = ca->set->journal.w[0].data;
+
+	memcpy(data, jset_addr, len << 9);
+
+	/* Indeed journal.w[0].data */
+	return data;
+}
+
+#else /* CONFIG_BCACHE_NVM_PAGES */
+
+static struct jset *__jnl_rd_nvm_bkt(struct cache *ca, unsigned int bkt_idx,
+				     unsigned int len, unsigned int offset)
+{
+	return NULL;
+}
+
+#endif /* CONFIG_BCACHE_NVM_PAGES */
+
 static int journal_read_bucket(struct cache *ca, struct list_head *list,
-			       unsigned int bucket_index)
+			       unsigned int bucket_idx)
 {
 	struct journal_device *ja = &ca->journal;
-	struct bio *bio = &ja->bio;
 
 	struct journal_replay *i;
-	struct jset *j, *data = ca->set->journal.w[0].data;
+	struct jset *j;
 	struct closure cl;
 	unsigned int len, left, offset = 0;
 	int ret = 0;
-	sector_t bucket = bucket_to_sector(ca->set, ca->sb.d[bucket_index]);
 
 	closure_init_stack(&cl);
 
-	pr_debug("reading %u\n", bucket_index);
+	pr_debug("reading %u\n", bucket_idx);
 
 	while (offset < ca->sb.bucket_size) {
 reread:		left = ca->sb.bucket_size - offset;
 		len = min_t(unsigned int, left, PAGE_SECTORS << JSET_BITS);
 
-		bio_reset(bio);
-		bio->bi_iter.bi_sector	= bucket + offset;
-		bio_set_dev(bio, ca->bdev);
-		bio->bi_iter.bi_size	= len << 9;
-
-		bio->bi_end_io	= journal_read_endio;
-		bio->bi_private = &cl;
-		bio_set_op_attrs(bio, REQ_OP_READ, 0);
-		bch_bio_map(bio, data);
-
-		closure_bio_submit(ca->set, bio, &cl);
-		closure_sync(&cl);
+		if (!bch_has_feature_nvdimm_meta(&ca->sb))
+			j = __jnl_rd_bkt(ca, bucket_idx, len, offset, &cl);
+		else
+			j = __jnl_rd_nvm_bkt(ca, bucket_idx, len, offset);
 
 		/* This function could be simpler now since we no longer write
 		 * journal entries that overlap bucket boundaries; this means
 		 * the start of a bucket will always have a valid journal entry
 		 * if it has any journal entries at all.
 		 */
-
-		j = data;
 		while (len) {
 			struct list_head *where;
 			size_t blocks, bytes = set_bytes(j);
 
 			if (j->magic != jset_magic(&ca->sb)) {
-				pr_debug("%u: bad magic\n", bucket_index);
+				pr_debug("%u: bad magic\n", bucket_idx);
 				return ret;
 			}
 
 			if (bytes > left << 9 ||
 			    bytes > PAGE_SIZE << JSET_BITS) {
 				pr_info("%u: too big, %zu bytes, offset %u\n",
-					bucket_index, bytes, offset);
+					bucket_idx, bytes, offset);
 				return ret;
 			}
 
@@ -96,7 +132,7 @@ reread:		left = ca->sb.bucket_size - offset;
 
 			if (j->csum != csum_set(j)) {
 				pr_info("%u: bad csum, %zu bytes, offset %u\n",
-					bucket_index, bytes, offset);
+					bucket_idx, bytes, offset);
 				return ret;
 			}
 
@@ -158,8 +194,8 @@ reread:		left = ca->sb.bucket_size - offset;
 			list_add(&i->list, where);
 			ret = 1;
 
-			if (j->seq > ja->seq[bucket_index])
-				ja->seq[bucket_index] = j->seq;
+			if (j->seq > ja->seq[bucket_idx])
+				ja->seq[bucket_idx] = j->seq;
 next_set:
 			offset	+= blocks * ca->sb.block_size;
 			len	-= blocks * ca->sb.block_size;
@@ -170,6 +206,8 @@ reread:		left = ca->sb.bucket_size - offset;
 	return ret;
 }
 
+static int __bch_journal_nvdimm_init(struct cache *ca);
+
 int bch_journal_read(struct cache_set *c, struct list_head *list)
 {
 #define read_bucket(b)							\
@@ -188,6 +226,13 @@ int bch_journal_read(struct cache_set *c, struct list_head *list)
 	unsigned int i, l, r, m;
 	uint64_t seq;
 
+	/*
+	 * Linear addresses of NVDIMM pages for journaling is not
+	 * initialized yet, do it before read jset from NVDIMM pages.
+	 */
+	if (bch_has_feature_nvdimm_meta(&ca->sb))
+		__bch_journal_nvdimm_init(ca);
+
 	bitmap_zero(bitmap, SB_JOURNAL_BUCKETS);
 	pr_debug("%u journal buckets\n", ca->sb.njournal_buckets);
 
-- 
2.26.2
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^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH v7 13/16] bcache: add sysfs interface register_nvdimm_meta to register NVDIMM meta device
  2021-04-09 16:43 [PATCH v7 00/16] bcache: support NVDIMM for journaling Coly Li
                   ` (11 preceding siblings ...)
  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
  2021-04-09 16:43 ` [PATCH v7 14/16] bcache: use div_u64() in init_owner_info() Coly Li
                   ` (2 subsequent siblings)
  15 siblings, 0 replies; 17+ messages in thread
From: Coly Li @ 2021-04-09 16:43 UTC (permalink / raw)
  To: linux-bcache
  Cc: linux-block, linux-nvdimm, axboe, jianpeng.ma, qiaowei.ren, hare,
	jack, Coly Li

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
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To unsubscribe send an email to linux-nvdimm-leave@lists.01.org

^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH v7 14/16] bcache: use div_u64() in init_owner_info()
  2021-04-09 16:43 [PATCH v7 00/16] bcache: support NVDIMM for journaling Coly Li
                   ` (12 preceding siblings ...)
  2021-04-09 16:43 ` [PATCH v7 13/16] bcache: add sysfs interface register_nvdimm_meta to register NVDIMM meta device Coly Li
@ 2021-04-09 16:43 ` 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
  15 siblings, 0 replies; 17+ messages in thread
From: Coly Li @ 2021-04-09 16:43 UTC (permalink / raw)
  To: linux-bcache
  Cc: linux-block, linux-nvdimm, axboe, jianpeng.ma, qiaowei.ren, hare,
	jack, Coly Li, kernel test robot

Kernel test robot reports the built-in u64/u32 in init_owner_info()
doesn't work for m68k arch, the explicit div_u64() should be used.

This patch explicit uses div_u64() to do the u64/u32 division on
32bit m68k arch.

Reported-by: kernel test robot <lkp@intel.com>
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/nvm-pages.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/bcache/nvm-pages.c b/drivers/md/bcache/nvm-pages.c
index c3ab396a45fa..19597ae7ef3e 100644
--- a/drivers/md/bcache/nvm-pages.c
+++ b/drivers/md/bcache/nvm-pages.c
@@ -405,7 +405,7 @@ static int init_owner_info(struct bch_nvm_namespace *ns)
 	only_set->owner_list_used = owner_list_head->used;
 
 	/*remove used space*/
-	remove_owner_space(ns, 0, ns->pages_offset/ns->page_size);
+	remove_owner_space(ns, 0, div_u64(ns->pages_offset, ns->page_size));
 
 	sys_recs = ns->kaddr + BCH_NVM_PAGES_SYS_RECS_HEAD_OFFSET;
 	// suppose no hole in array
-- 
2.26.2
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^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH v7 15/16] bcache: fix BCACHE_NVM_PAGES' dependences in Kconfig
  2021-04-09 16:43 [PATCH v7 00/16] bcache: support NVDIMM for journaling Coly Li
                   ` (13 preceding siblings ...)
  2021-04-09 16:43 ` [PATCH v7 14/16] bcache: use div_u64() in init_owner_info() Coly Li
@ 2021-04-09 16:43 ` Coly Li
  2021-04-09 16:43 ` [PATCH v7 16/16] bcache: more fix for compiling error when BCACHE_NVM_PAGES disabled Coly Li
  15 siblings, 0 replies; 17+ messages in thread
From: Coly Li @ 2021-04-09 16:43 UTC (permalink / raw)
  To: linux-bcache
  Cc: linux-block, linux-nvdimm, axboe, jianpeng.ma, qiaowei.ren, hare,
	jack, Coly Li

This patch fix the following dependences for BCACHE_NVM_PAGES in
Kconfig,
- Add "depends on PHYS_ADDR_T_64BIT" which is mandatory for libnvdimm
- Add "select LIBNVDIMM" and "select DAX" because nvm-pages code needs
  libnvdimm and dax driver.

This patch can be merged into previous nvm-pages patches, and dropped
in next version series.

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/Kconfig | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/md/bcache/Kconfig b/drivers/md/bcache/Kconfig
index fdec9905ef40..0996e366ad0b 100644
--- a/drivers/md/bcache/Kconfig
+++ b/drivers/md/bcache/Kconfig
@@ -39,5 +39,8 @@ config BCACHE_ASYNC_REGISTRATION
 config BCACHE_NVM_PAGES
 	bool "NVDIMM support for bcache (EXPERIMENTAL)"
 	depends on BCACHE
+	depends on PHYS_ADDR_T_64BIT
+	select LIBNVDIMM
+	select DAX
 	help
 	nvm pages allocator for bcache.
-- 
2.26.2
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To unsubscribe send an email to linux-nvdimm-leave@lists.01.org

^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH v7 16/16] bcache: more fix for compiling error when BCACHE_NVM_PAGES disabled
  2021-04-09 16:43 [PATCH v7 00/16] bcache: support NVDIMM for journaling Coly Li
                   ` (14 preceding siblings ...)
  2021-04-09 16:43 ` [PATCH v7 15/16] bcache: fix BCACHE_NVM_PAGES' dependences in Kconfig Coly Li
@ 2021-04-09 16:43 ` Coly Li
  15 siblings, 0 replies; 17+ messages in thread
From: Coly Li @ 2021-04-09 16:43 UTC (permalink / raw)
  To: linux-bcache
  Cc: linux-block, linux-nvdimm, axboe, jianpeng.ma, qiaowei.ren, hare,
	jack, Coly Li

This patch fixes the compiling error when BCACHE_NVM_PAGES is disabled.
The change could be added into previous nvm-pages patches, so that this
patch can be dropped in next nvm-pages series.

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/nvm-pages.c | 4 ++--
 drivers/md/bcache/nvm-pages.h | 2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/md/bcache/nvm-pages.c b/drivers/md/bcache/nvm-pages.c
index 19597ae7ef3e..b32f162bf728 100644
--- a/drivers/md/bcache/nvm-pages.c
+++ b/drivers/md/bcache/nvm-pages.c
@@ -7,6 +7,8 @@
  * Copyright (c) 2021, Jianpeng Ma <jianpeng.ma@intel.com>.
  */
 
+#ifdef CONFIG_BCACHE_NVM_PAGES
+
 #include "bcache.h"
 #include "nvm-pages.h"
 
@@ -23,8 +25,6 @@
 #include <linux/blkdev.h>
 #include <linux/bcache-nvm.h>
 
-#ifdef CONFIG_BCACHE_NVM_PAGES
-
 struct bch_nvm_set *only_set;
 
 static void release_nvm_namespaces(struct bch_nvm_set *nvm_set)
diff --git a/drivers/md/bcache/nvm-pages.h b/drivers/md/bcache/nvm-pages.h
index 1c4cbad0209f..f9e0cd7ca3dd 100644
--- a/drivers/md/bcache/nvm-pages.h
+++ b/drivers/md/bcache/nvm-pages.h
@@ -3,8 +3,10 @@
 #ifndef _BCACHE_NVM_PAGES_H
 #define _BCACHE_NVM_PAGES_H
 
+#ifdef CONFIG_BCACHE_NVM_PAGES
 #include <linux/bcache-nvm.h>
 #include <linux/libnvdimm.h>
+#endif /* CONFIG_BCACHE_NVM_PAGES */
 
 /*
  * Bcache NVDIMM in memory data structures
-- 
2.26.2
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^ permalink raw reply	[flat|nested] 17+ messages in thread

end of thread, other threads:[~2021-04-09 16:45 UTC | newest]

Thread overview: 17+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
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 ` [PATCH v7 13/16] bcache: add sysfs interface register_nvdimm_meta to register NVDIMM meta device Coly Li
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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