fix typos in sys/dev/dm code comments and documentation.
also remove some trailing space in documentation.

Adapt to proplib API chanages.

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

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

dm: Add dm-delay target

Ported from DragonFlyBSD, but this target had originally existed in
Linux kernel. See below for details.
https://www.kernel.org/doc/Documentation/device-mapper/delay.txt

Due

dm: Add dm-delay target

Ported from DragonFlyBSD, but this target had originally existed in
Linux kernel. See below for details.
https://www.kernel.org/doc/Documentation/device-mapper/delay.txt

Due to "tick" in hz(9) not working (which results in dmdlthread spinning
forever in _submit_queue() without dp extracted from delayed list
and queued into submit list), this hasn't been hooked to dm.kmod yet.

taken-from: DragonFlyBSD

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dm: Add dm-flakey target

Ported from DragonFlyBSD, but this target had originally existed in
Linux kernel. See below for details.
https://www.kernel.org/doc/Documentation/device-mapper/dm-flakey.txt

dm: Add dm-flakey target

Ported from DragonFlyBSD, but this target had originally existed in
Linux kernel. See below for details.
https://www.kernel.org/doc/Documentation/device-mapper/dm-flakey.txt

Due to two technical issues, this hasn't been hooked to dm.kmod yet.
1) "tick" in hz(9) not working.
2) Unable to use ->b_private in nestiobuf callback when it's already
used for mbp (see HAS_BUF_PRIV2).

taken-from: DragonFlyBSD

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dm: Make target's ->table() optional

Since ->info() (counter part of ->table() in the original dm design
in Linux kernel in .status where both INFO and TABLE are optional)
is an optional handler, ma

dm: Make target's ->table() optional

Since ->info() (counter part of ->table() in the original dm design
in Linux kernel in .status where both INFO and TABLE are optional)
is an optional handler, make ->table() optional as well. Some
targets don't have anything to do in ->table() just as in ->info().

taken-from: DragonFlyBSD

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dm: Fix dm-stripe's "status" output format

As mentioned in "dm: Don't try to implement "status" as subset of "table"",
dm-stripe in NetBSD doesn't have correct "status" output format.
Implement ->in

dm: Fix dm-stripe's "status" output format

As mentioned in "dm: Don't try to implement "status" as subset of "table"",
dm-stripe in NetBSD doesn't have correct "status" output format.
Implement ->info() to sync with Linux kernel.

Note that num_error for stripe device isn't implemented yet.

taken-from: DragonFlyBSD

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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

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dm: u_{int,long} -> unsigned {int,long}

dm: Enable dm-error and dm-zero target

Add these two targets to dm.kmod.
These are generally available in Linux and DragonFlyBSD,
so enable them in NetBSD as well.

dm: Style cleanups (no functional changes)

dm: Make targets' ->sync() optional

Apparently some targets have nothing to sync, so make it optional.

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)".

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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

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dm: Remove void casts of function calls

Use of void casts in dm is not consistent, just get rid of them.

dm: Don't KASSERT() target handlers

Having assertions here causes panic if target is missing anything
as shown in "dm: Add dummy target ->sync()/->secsize() to prevent panic on modload(8)".
Instead

dm: Don't KASSERT() target handlers

Having assertions here causes panic if target is missing anything
as shown in "dm: Add dummy target ->sync()/->secsize() to prevent panic on modload(8)".
Instead just return EINVAL if a handler(s) isn't implemented.

taken-from: DragonFlyBSD

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dm: Unbreak compilation of kernel modules

The dm kernel modules (MK_DM_TARGETS enabled in sys/modules/dm/Makefile)
have been broken. Unbreak the build.

dm: Fix strange pointer declarations

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

dm: Simplify list eviction code

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: style + whitespace + indentation fixes

No functional changes.

dm: Make global dm locks static

These are all per-file locks which protect dev/pdev/target structure.
taken-from: DragonFlyBSD

use some size_t, add whitespace between functions, rcsids.

src is too big these days to tolerate superfluous apostrophes. It's
"its", people!

readd assertions noew with the correct struct
im wondering why the module cflags didnt warn about this obvious typo