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| author | Nikos Tsironis <ntsironis@arrikto.com> | 2019-09-11 16:36:40 +0200 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2019-09-12 15:32:31 +0200 |
| commit | 7431b7835f554f8608b415a02cf3c3f086309e02 (patch) | |
| tree | 8362b989838a798fb1e58fe51dfb348759a0c810 /drivers/md/Kconfig | |
| parent | dm raid: fix updating of max_discard_sectors limit (diff) | |
| download | linux-7431b7835f554f8608b415a02cf3c3f086309e02.tar.xz linux-7431b7835f554f8608b415a02cf3c3f086309e02.zip | |
dm: add clone target
Add the dm-clone target, which allows cloning of arbitrary block
devices.
dm-clone produces a one-to-one copy of an existing, read-only source
device into a writable destination device: It presents a virtual block
device which makes all data appear immediately, and redirects reads and
writes accordingly.
The main use case of dm-clone is to clone a potentially remote,
high-latency, read-only, archival-type block device into a writable,
fast, primary-type device for fast, low-latency I/O. The cloned device
is visible/mountable immediately and the copy of the source device to
the destination device happens in the background, in parallel with user
I/O.
When the cloning completes, the dm-clone table can be removed altogether
and be replaced, e.g., by a linear table, mapping directly to the
destination device.
For further information and examples of how to use dm-clone, please read
Documentation/admin-guide/device-mapper/dm-clone.rst
Suggested-by: Vangelis Koukis <vkoukis@arrikto.com>
Co-developed-by: Ilias Tsitsimpis <iliastsi@arrikto.com>
Signed-off-by: Ilias Tsitsimpis <iliastsi@arrikto.com>
Signed-off-by: Nikos Tsironis <ntsironis@arrikto.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/Kconfig')
| -rw-r--r-- | drivers/md/Kconfig | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig index 9b82d74fe2e5..aa98953f4462 100644 --- a/drivers/md/Kconfig +++ b/drivers/md/Kconfig @@ -347,6 +347,20 @@ config DM_ERA over time. Useful for maintaining cache coherency when using vendor snapshots. +config DM_CLONE + tristate "Clone target (EXPERIMENTAL)" + depends on BLK_DEV_DM + default n + select DM_PERSISTENT_DATA + ---help--- + dm-clone produces a one-to-one copy of an existing, read-only source + device into a writable destination device. The cloned device is + visible/mountable immediately and the copy of the source device to the + destination device happens in the background, in parallel with user + I/O. + + If unsure, say N. + config DM_MIRROR tristate "Mirror target" depends on BLK_DEV_DM |