linux-kernel - [PATCH RFC -next 01/26] md/md-bitmap: introduce struct bitmap

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Message-Id: <20240810020854.797814-2-yukuai1@huaweicloud.com>
Date: Sat, 10 Aug 2024 10:08:29 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: song@...nel.org
Cc: linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org,
	yukuai3@...wei.com,
	yukuai1@...weicloud.com,
	yi.zhang@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH RFC -next 01/26] md/md-bitmap: introduce struct bitmap_operations

From: Yu Kuai <yukuai3@...wei.com>

The structure is empty for now, and will be used in later patches to
merge in bitmap operations, prepare to implement a new lock free
bitmap in the fulture.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/md/md-bitmap.c | 8 ++++++++
 drivers/md/md-bitmap.h | 4 ++++
 drivers/md/md.c        | 1 +
 drivers/md/md.h        | 1 +
 4 files changed, 14 insertions(+)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 08232d8dc815..d9838fbcc9d7 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -2707,3 +2707,11 @@ const struct attribute_group md_bitmap_group = {
 	.name = "bitmap",
 	.attrs = md_bitmap_attrs,
 };
+
+static struct bitmap_operations bitmap_ops = {
+};
+
+void mddev_set_bitmap_ops(struct mddev *mddev)
+{
+	mddev->bitmap_ops = &bitmap_ops;
+}
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index bb9eb418780a..992feaf66d47 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -234,7 +234,11 @@ struct bitmap {
 	int cluster_slot;		/* Slot offset for clustered env */
 };
 
+struct bitmap_operations {
+};
+
 /* the bitmap API */
+void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are used only by md/bitmap */
 struct bitmap *md_bitmap_create(struct mddev *mddev, int slot);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index d3a837506a36..f23138dd96a7 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -772,6 +772,7 @@ int mddev_init(struct mddev *mddev)
 	mddev->resync_min = 0;
 	mddev->resync_max = MaxSector;
 	mddev->level = LEVEL_NONE;
+	mddev_set_bitmap_ops(mddev);
 
 	INIT_WORK(&mddev->sync_work, md_start_sync);
 	INIT_WORK(&mddev->del_work, mddev_delayed_delete);
diff --git a/drivers/md/md.h b/drivers/md/md.h
index a0d6827dced9..e56193f71ab4 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -536,6 +536,7 @@ struct mddev {
 	int				sync_checkers;	/* # of threads checking writes_pending */
 
 	struct bitmap			*bitmap; /* the bitmap for the device */
+	struct bitmap_operations	*bitmap_ops;
 	struct {
 		struct file		*file; /* the bitmap file */
 		loff_t			offset; /* offset from superblock of
-- 
2.39.2