From: Sergei Shtepa <sergei.shtepa@xxxxxxxxx> Allows to build a module and add the blksnap to the kernel tree. Co-developed-by: Christoph Hellwig <hch@xxxxxxxxxxxxx> Signed-off-by: Christoph Hellwig <hch@xxxxxxxxxxxxx> Signed-off-by: Sergei Shtepa <sergei.shtepa@xxxxxxxxx> --- 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
