diff mbox series

[v4,11/11] blksnap: Kconfig and Makefile

Message ID 20230609115858.4737-11-sergei.shtepa@veeam.com (mailing list archive)
State Superseded
Headers show
Series [v4,01/11] documentation: Block Device Filtering Mechanism | expand

Commit Message

Sergei Shtepa June 9, 2023, 11:58 a.m. UTC 
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  | 12 ++++++++++++
 drivers/block/blksnap/Makefile | 15 +++++++++++++++
 4 files changed, 31 insertions(+)
 create mode 100644 drivers/block/blksnap/Kconfig
 create mode 100644 drivers/block/blksnap/Makefile

--
2.20.1

Comments

Randy Dunlap June 12, 2023, 11:43 p.m. UTC | #1 
On 6/9/23 04:58, Sergei Shtepa wrote:
> diff --git a/drivers/block/blksnap/Kconfig b/drivers/block/blksnap/Kconfig
> new file mode 100644
> index 000000000000..14081359847b
> --- /dev/null
> +++ b/drivers/block/blksnap/Kconfig
> @@ -0,0 +1,12 @@
> +# 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 simple block devices. Snapshots are
> +	  temporary and are released then backup is completed. Change block

	                             when backup is completed.

or is the order of operations as listed: release snapshots and then backup
can be completed?

> +	  tracking allows to create incremental or differential backups.
Sergei Shtepa June 13, 2023, 10:47 a.m. UTC | #2 
On 6/13/23 01:43, Randy Dunlap wrote:
>> +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 simple block devices. Snapshots are
>> +	  temporary and are released then backup is completed. Change block
> 	                             when backup is completed.
> 
> or is the order of operations as listed: release snapshots and then backup
> can be completed?
> 
>> +	  tracking allows to create incremental or differential backups.

"when backup is completed." - it will be more correct.

Normal backup process:

Take snapshot                                        Release snapshot
    |    Start backup                        Finish backup   |
    |        |  Copy data from snapshot images    |          |
------------------------------------------------------------------------->
                                                                         t

In case of failure, for example, when the snapshot is overflowing:

                                           The snapshot is corrupted
Take snapshot                                   | Release snapshot
    |    Start backup                           |   | Finish failed backup
    |        |  Copy data from snapshot images  |   |    |
------------------------------------------------------------------------->
                                                                         t
diff mbox series

Patch

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-$(CONFIG_BLKSNAP) += blksnap/
diff --git a/drivers/block/blksnap/Kconfig b/drivers/block/blksnap/Kconfig
new file mode 100644
index 000000000000..14081359847b
--- /dev/null
+++ b/drivers/block/blksnap/Kconfig
@@ -0,0 +1,12 @@ 
+# SPDX-License-Identifier: GPL-2.0
+#
+# Block device snapshot module configuration
+#
+
+config BLKSNAP
+	tristate "Block Devices Snapshots Module (blksnap)"
+	help
+	  Allow to create snapshots and track block changes for block devices.
+	  Designed for creating backups for simple block devices. Snapshots are
+	  temporary and are released then backup is completed. Change block
+	  tracking allows to create incremental or differential backups.
diff --git a/drivers/block/blksnap/Makefile b/drivers/block/blksnap/Makefile
new file mode 100644
index 000000000000..8d528b95579a
--- /dev/null
+++ b/drivers/block/blksnap/Makefile
@@ -0,0 +1,15 @@ 
+# SPDX-License-Identifier: GPL-2.0
+
+blksnap-y := 		\
+	cbt_map.o	\
+	chunk.o		\
+	diff_area.o	\
+	diff_buffer.o	\
+	diff_storage.o	\
+	event_queue.o	\
+	main.o		\
+	snapimage.o	\
+	snapshot.o	\
+	tracker.o
+
+obj-$(CONFIG_BLKSNAP)	 += blksnap.o