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Commit 1caf05ce authored by Palmer Dabbelt's avatar Palmer Dabbelt Committed by Alistair Delva
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ANDROID: dm: dm-user: New target that proxies BIOs to userspace 



dm-user is essentially FUSE for block devices: as BIOs come in through
device mapper they are proxied to a userspace daemon via a control misc
device.

This is very much a work in progress.  There's a handful of FIXMEs
spread throughout the code with more details.  As far as I know there is
nothing broken with the current code, there's just more work to do.

Test: Ran the selftests on the version of this I'm developing for Linus'
      tree, on both 4.19 and 5.8.
Bug: 161496058
Signed-off-by: default avatarPalmer Dabbelt <palmerdabbelt@google.com>
Change-Id: If5bcd8a43c3db5b556563ba303f474dd0d2902e8
parent d547cb39

drivers/md/Kconfig

+14 −0
Original line number Diff line number Diff line
@@ -601,4 +601,18 @@ config DM_BOW 


	  If unsure, say N.



config DM_USER

	tristate "Block device in userspace"

	depends on BLK_DEV_DM

	default y

	help

	  This device-mapper target allows a userspace daemon to provide the

	  contents of a block device.  See

	  <file:Documentation/block/dm-user.rst> for more information.



	  To compile this code as a module, choose M here: the module will be

	  called dm-user.



	  If unsure, say N.



endif # MD

drivers/md/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -70,6 +70,7 @@ obj-$(CONFIG_DM_INTEGRITY) += dm-integrity.o 
obj-$(CONFIG_DM_ZONED)		+= dm-zoned.o

obj-$(CONFIG_DM_WRITECACHE)	+= dm-writecache.o

obj-$(CONFIG_DM_BOW)		+= dm-bow.o

obj-$(CONFIG_DM_USER)		+= dm-user.o



ifeq ($(CONFIG_DM_UEVENT),y)

dm-mod-objs			+= dm-uevent.o

drivers/md/dm-user.c

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