dm: #if0 target's ->upcall() handler

This is part of NetBSD's dm design, but unimplemented
(all handlers return 0) and also unused.

dm: Remove target's ->deps() by implementing deps in dm core

Retrieving device dependencies doesn't need to be target specific.
The reason it currently needs ->deps() is because dm core doesn't
have

dm: Remove target's ->deps() by implementing deps in dm core

Retrieving device dependencies doesn't need to be target specific.
The reason it currently needs ->deps() is because dm core doesn't
have data structure that allows table to walk through target's
underlying devices. Add struct dm_mapping to be able to do this,
and remove ->deps()'s from targets which basically do the same thing.

=====(A) before this commit
table
| [dm core]
-------------------------------------------------------
| pdev pdev pdev [dm targets]
v ^ ^ ^
target----/---------/---------/
(void*)

=====(B) this commit
table---->mapping-->mapping-->mapping-->...
| | | |
| v v v [dm core]
-------------------------------------------------------
| pdev pdev pdev [dm targets]
v ^ ^ ^
target----/---------/---------/
(void*)

taken-from: DragonFlyBSD

show more ...

dm: Style cleanups (no functional changes)

dm: Make targets' ->secsize() optional

and make a caller assume secsize 0 if ->secsize not present.
This allows a dummy function to be removed which was added in
"dm: Add dummy target ->sync()/->sec

dm: Make targets' ->secsize() optional

and make a caller assume secsize 0 if ->secsize not present.
This allows a dummy function to be removed which was added in
"dm: Add dummy target ->sync()/->secsize() to prevent panic on modload(8)".

show more ...

dm: Rename targets' ->status() to ->table() given ->info() exists

Since now that dm targets in NetBSD have ->info() for "status",
->status() should be renamed to ->table() for "table",
given how dm

dm: Rename targets' ->status() to ->table() given ->info() exists

Since now that dm targets in NetBSD have ->info() for "status",
->status() should be renamed to ->table() for "table",
given how dm target status was originally designed in Linux kernel.

taken-from: DragonFlyBSD

show more ...

dm: Remove unconditional debug prints in targets' ->strategy()

Having debug prints in ->strategy() by default just to tell ->strategy()
is called is overkill.
taken-from: DragonFlyBSD

dm: Make target's ->init() take parsed argc and argv

This gets rid of the same parser code in each target using strsep(3).
taken-from: DragonFlyBSD

dm: Add dummy target ->sync()/->secsize() to prevent panic on modload(8)

dm_target_insert() has assertions to ensure targets implement all handlers.
Adding dummy ones at least prevents panic on modl

dm: Add dummy target ->sync()/->secsize() to prevent panic on modload(8)

dm_target_insert() has assertions to ensure targets implement all handlers.
Adding dummy ones at least prevents panic on modload(8).

show more ...

dm: Move targets specific structs to .c files

These don't need to be defined and exposed in dm.h.

dm: Refactor target's ->init() i/f

Take dm_table_entry_t* instead of void**.
Remove dm_dev_t* unneeded by target code.
No functional change, but for future changes.

taken-from: DragonFlyBSD

dm: Fix strange pointer declarations

Should be "type *name" or "type* name", but not "type * name".
taken-from: DragonFlyBSD

dm: Don't ignore dm_target_alloc() argument

dm_target_alloc() is supposed to be copying the name argument to its ->name.
taken-from: DragonFlyBSD

dm: Make dm core set config to NULL after destroy

Just let dm core do this instead of having a comment expecting each
target to do the right thing.

taken-from: DragonFlyBSD

dm: Remove unused dm_dev::dev_type

Given OOP-like architecture of dm target device structure,
dm_dev doesn't need to have self contained target type field,
and in fact this is unused.

use some size_t, add whitespace between functions, rcsids.

Add support for DIOCCACHESYNC ioctl for dm devices. Add new sync function
pointer to dm_target_t because that is the only part of dm which know real
block device. disk_ioctl_switch parses whole devic

Add support for DIOCCACHESYNC ioctl for dm devices. Add new sync function
pointer to dm_target_t because that is the only part of dm which know real
block device. disk_ioctl_switch parses whole device table and for every
entry it calls particular sync routine which propagates DIOCCACHESYNC
to real disk.

While I was here implement some KNF fixes and remove unneeded symbols from
dm.h.

Problem reported on port-xen@ by Hugo Silva.

show more ...

Indent files remove unnecessary blank lines, white spaces and KNFize code.

Revert my commit which have added knowledge about dm targets to libdevmapper,
this breaks abstraction. Because only lvmtools/lvmlib and device-mapper can
have knowledge about target mapping and libde

Revert my commit which have added knowledge about dm targets to libdevmapper,
this breaks abstraction. Because only lvmtools/lvmlib and device-mapper can
have knowledge about target mapping and libdevmapper only passes requests
from lvmtools to kernel and back. Bump major library and driver version.

Requested by: yamt@

show more ...

Parse dm param string in libdevmapper and not in a dm target init function.
Create proplib param dictionary entry in libdevmapper and pass it to dm in
dm_ioctl dict.
Param target is then passed to ta

Parse dm param string in libdevmapper and not in a dm target init function.
Create proplib param dictionary entry in libdevmapper and pass it to dm in
dm_ioctl dict.
Param target is then passed to target init function, where is parse. I like
this aproach much better than passing char **argv and trusting to user input.

I have bumped minor lib/driver version.

XXX. Add more sanity checks in kernel.

show more ...

Change comment and add description of line used to configure mirror device.

Add support for autoloading of device-mapper targets modules. Add
dm_target_autoload function which tries to load target module. Fix two
deadlocks in dm_table_load_ioctl error path(I forgot to call d

Add support for autoloading of device-mapper targets modules. Add
dm_target_autoload function which tries to load target module. Fix two
deadlocks in dm_table_load_ioctl error path(I forgot to call dm_dev_unbusy).

show more ...

Add dm module as dependency and remove module_hold/module_rele calls.

Return ENOSYS during from dm_target_init routine these tow targets aren't
implemented yet.

Add stubs for mirror target, too. This target does nothing for now, but lvm
tools support mirror target and trying to create LV with mirrorred backend
caused panic in dm_table_load_ioctl.