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From:   Sergei Shtepa <sergei.shtepa@linux.dev>
To:     axboe@kernel.dk, hch@infradead.org, corbet@lwn.net,
        snitzer@kernel.org
Cc:     mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com,
        viro@zeniv.linux.org.uk, brauner@kernel.org,
        linux-block@vger.kernel.org, linux-doc@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        Sergei Shtepa <sergei.shtepa@veeam.com>
Subject: [PATCH v6 10/11] blksnap: Kconfig and Makefile
Date:   Fri, 24 Nov 2023 17:59:32 +0100
Message-Id: <20231124165933.27580-11-sergei.shtepa@linux.dev>
In-Reply-To: <20231124165933.27580-1-sergei.shtepa@linux.dev>
References: <20231124165933.27580-1-sergei.shtepa@linux.dev>
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From: Sergei Shtepa <sergei.shtepa@veeam.com>

Allows to build a module and add the blksnap to the kernel tree.

Co-developed-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Sergei Shtepa <sergei.shtepa@veeam.com>
---
 drivers/block/Kconfig          |  2 ++
 drivers/block/Makefile         |  2 ++
 drivers/block/blksnap/Kconfig  | 31 +++++++++++++++++++++++++++++++
 drivers/block/blksnap/Makefile | 15 +++++++++++++++
 4 files changed, 50 insertions(+)
 create mode 100644 drivers/block/blksnap/Kconfig
 create mode 100644 drivers/block/blksnap/Makefile

diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index 5b9d4aaebb81..74d2d55526a3 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -404,4 +404,6 @@ config BLKDEV_UBLK_LEGACY_OPCODES
 
 source "drivers/block/rnbd/Kconfig"
 
+source "drivers/block/blksnap/Kconfig"
+
 endif # BLK_DEV
diff --git a/drivers/block/Makefile b/drivers/block/Makefile
index 101612cba303..9a2a9a56a247 100644
--- a/drivers/block/Makefile
+++ b/drivers/block/Makefile
@@ -40,3 +40,5 @@ obj-$(CONFIG_BLK_DEV_NULL_BLK)	+= null_blk/
 obj-$(CONFIG_BLK_DEV_UBLK)			+= ublk_drv.o
 
 swim_mod-y	:= swim.o swim_asm.o
+
+obj-$(CONFIG_BLKSNAP) += blksnap/
diff --git a/drivers/block/blksnap/Kconfig b/drivers/block/blksnap/Kconfig
new file mode 100644
index 000000000000..f52272c12e1b
--- /dev/null
+++ b/drivers/block/blksnap/Kconfig
@@ -0,0 +1,31 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Block device snapshot module configuration
+#
+
+config BLKSNAP
+	tristate "Block Devices Snapshots Module (blksnap)"
+	help
+	  Allow to create snapshots and track block changes for block devices.
+	  Designed for creating backups for block devices. Snapshots are
+	  temporary and are released when backup is completed. Change block
+	  tracking allows to create incremental or differential backups.
+
+config BLKSNAP_DIFF_BLKDEV
+	bool "Use an optimized algorithm to store difference on a block device"
+	depends on BLKSNAP
+	default y
+	help
+	  The difference storage for a snapshot can be a regular file or a
+	  block device. We can work with a block device through the interface
+	  of a regular file. However, direct management of I/O units should
+	  allow for higher performance.
+
+config BLKSNAP_CHUNK_DIFF_BIO_SYNC
+	bool "Use a synchronous I/O unit processing algorithm for the snapshot image"
+	depends on BLKSNAP
+	default n
+	help
+	  Theoretical asynchronous algorithm for processing I/O units should
+	  have higher performance. However, an attempt to confirm this on test
+	  runs did not bring any results.
diff --git a/drivers/block/blksnap/Makefile b/drivers/block/blksnap/Makefile
new file mode 100644
index 000000000000..8d528b95579a
--- /dev/null
+++ b/drivers/block/blksnap/Makefile
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0
+
+blksnap-y := 		\
+	cbt_map.o	\
+	chunk.o		\
+	diff_area.o	\
+	diff_buffer.o	\
+	diff_storage.o	\
+	event_queue.o	\
+	main.o		\
+	snapimage.o	\
+	snapshot.o	\
+	tracker.o
+
+obj-$(CONFIG_BLKSNAP)	 += blksnap.o
-- 
2.20.1