miscfs/deadfs/deadfs.h: New home for deadfs-related externs.

XXX regen sys/kern/vnode_if.c and the others

Make kqueue event status for vnodes shareable, and for stacked file systems
like nullfs, make the upper vnode share that status with the lower vnode.

And, lo, NetBSD 9.99.99.

Fixes PR kern/56713.

Really depend the lockdebug checks on option VNODE_LOCKDEBUG -- were
enabled by accident.

Make option VNODE_LOCKDEBUG more functional.

- Add "LOCKED=EXCL" option for vnode operations needing exclusive locked nodes.

- As it is impossible to check for shared locks held by current thread avoid
false assertions by testing for exclusive lock only in the "LOCKED=NO" case.

- New option "RUMP_VNODE_LOCKDEBUG" enables VNODE_LOCKDEBUG for the rump kernel.

Remove now unused VV_LOCKSWORK, all file systems support locking.

Remove unused predicates vn_locked() and vn_anylocked().

Welcome to 9.99.95

Overhaul of the EVFILT_VNODE kevent(2) filter:

- Centralize vnode kevent handling in the VOP_*() wrappers, rather than
forcing each individual file system to deal with it (except VOP_RENAME(),
because VOP_RENAME() is a mess and we currently have 2 different ways
of handling it; at least it's reasonably well-centralized in the "new"
way).
- Add support for NOTE_OPEN, NOTE_CLOSE, NOTE_CLOSE_WRITE, and NOTE_READ,
compatible with the same events in FreeBSD.
- Track which kevent notifications clients are interested in receiving
to avoid doing work for events no one cares about (avoiding, e.g.
taking locks and traversing the klist to send a NOTE_WRITE when
someone is merely watching for a file to be deleted, for example).

In support of the above:

- Add support in vnode_if.sh for specifying PRE- and POST-op handlers,
to be invoked before and after vop_pre() and vop_post(), respectively.
Basic idea from FreeBSD, but implemented differently.
- Add support in vnode_if.sh for specifying CONTEXT fields in the
vop_*_args structures. These context fields are used to convey information
between the file system VOP function and the VOP wrapper, but do not
occupy an argument slot in the VOP_*() call itself. These context fields
are initialized and subsequently interpreted by PRE- and POST-op handlers.
- Version VOP_REMOVE(), uses the a context field for the file system to report
back the resulting link count of the target vnode. Return this in tmpfs,
udf, nfs, chfs, ext2fs, lfs, and ufs.

NetBSD 9.99.92.

s/beween/between/

Add ACL support for FFS. From FreeBSD.

Merge from ad-namecache:

- Have a stab at clustering the members of vnode_t and vnode_impl_t in a
more cache-conscious way. With that done, go back to adjusting v_usecount
with atomics and keep vi_lock directly in vnode_impl_t (saves KVA).

- Allow VOP_LOCK(LK_NONE) for the benefit of VFS_VGET() and VFS_ROOT().
Make sure LK_UPGRADE always comes with LK_NOWAIT.

- Make cwdinfo use mostly lockless.

branches: 1.68.2;
Minor vnode locking changes:

- Stop using atomics to maniupulate v_usecount. It was a mistake to begin
with. It doesn't work as intended unless the XLOCK bit is incorporated in
v_usecount and we don't have that any more. When I introduced this 10+
years ago it was to reduce pressure on v_interlock but it doesn't do that,
it just makes stuff disappear from lockstat output and introduces problems
elsewhere. We could do atomic usecounts on vnodes but there has to be a
well thought out scheme.

- Resurrect LK_UPGRADE/LK_DOWNGRADE which will be needed to work effectively
when there is increased use of shared locks on vnodes.

- Allocate the vnode lock using rw_obj_alloc() to reduce false sharing of
struct vnode.

- Put all of the LRU lists into a single cache line, and do not requeue a
vnode if it's already on the correct list and was requeued recently (less
than a second ago).

Kernel build before and after:

119.63s real 1453.16s user 2742.57s system
115.29s real 1401.52s user 2690.94s system

As VOP_STRATEGY() usually calls itself on the file system holding "/dev"
it may deadlock on suspension of this file system.

Add fstrans type LAZY and use it for VOP_STRATEGY().

Adress PR kern/53624 (dom0 freeze on domU exit) is still there

branches: 1.66.6; 1.66.10;
Operations fstrans_start() and fstrans_start_nowait() now always
use FSTRANS_SHARED as lock type so remove the lock type argument.

Add "FSTRANS=LOCK" and "FSTRANS=UNLOCK" to vop_lock and vop_unlock.

Add two "static inline" functions to vnode_if.c to handle MPSAFE
and FSTRANS before and after the "VCALL()".

Take FSTRANS and handle error before "VCALL(...vop_lock...)" and
release it after "VCALL(...vop_unlock...)".

branches: 1.64.4;
Count vnode arguments correctly.

Don't count arguments that have WILLRELE/WILLPUT; count arguments
that are struct vnode *.

No functional change currently because it happens that every released
or put vnode argument comes first or after other ones.

Eliminate now-unused WILLUNLOCK vop flag.

Prepare to move fstrans into vnode_if.c, allow "FSTRANS=YES"
and "FSTRANS=NO" in the vop description.
Add fstrans_start()/fstrans_done() to all vops that have FSTRANS=YES
or have the first vnode unlocked.

branches: 1.61.2; 1.61.4;
"rump_private.h" -> <rump-sys/kern.h>

branches: 1.60.6;
Support for vnode operation versioning. Allow a new keyword "VERSION"
in the description so "VERSION 2" will change the name of the argument
from vop_XXX_args to vop_XXX_v2_args.

Additionally translate daddr_t to int64_t in the rumpvnode interface.
The type daddr_t is not available for all systems (e.g. Linux systems with
musl libc), and exposing it will just cause an unnecessary compilation
failure even if the type is not used.

branches: 1.58.2; 1.58.12; 1.58.16; 1.58.24;
Change VOP_BWRITE() to take a vnode as its first argument like all other
VOPs do. Layered file systems no longer have to modify bp->b_vp and run
into trouble when an async VOP_BWRITE() uses the wrong vnode.

Adresses PR kern/38762 panic: vwakeup: neg numoutput

No objections from tech-kern@.

- Use offsetof() in VOPARG_OFFSETOF() instead of re-implementing it.
- Remove VDESC_NOMAP_VPP and VDESC_VPP_WILLRELE.
- Remove VRELEL_NOINACTIVE and VRELEL_ONHEAD.

branches: 1.56.2;
Make rump vnode interface lightweight: the only things we
really need are:

0) provide VOP_OP in the alternate RUMP_VOP_OP namespace

and for each op:
1) schedule rump cpu
2) call VOP_OP
3) unschedule rump cpu

While here, take the opportunity to get rid of _t lossage in the
rump-exported interfaces.

Print "end of special cases" only where special cases end and not
a second time at the end of the file. Adjust whitespace for the
sheer functional joy of it.

(i hope i didn't ruin someone's joke by missing a humorous implication
that all vnode operations are considered a little special)

"Not yet" since 4.4BSD is quite a lot of "not yet", so remove
vdesc_transports from vnodeop_desc until we have a "not not yet"
situation.

Ride 5.99.27 bump (full build still in progress. i wanted to get
this in as soon as possible to most effectively ride the bump.)

branches: 1.53.2; 1.53.4;
Generate scheduling points around rump vnode operations.

Add a switch on whether to create VNODE_LOCKDEBUG checks or not.
Since VNODE_LOCKDEBUG has never been generally useful, default to
off. However, the checks can still be generated by flipping the
switch for the isolated cases where this form of dynamic analysis
is useful and the person using it knows what she is doing.

Split vfs out of rumpkern into rumpvfs. Non-fs rumps no longer
include the file system code. File system rumps explicitly need
to include rumpvfs from now on.

Make this generate the rump vnode interface files.

branches: 1.49.4; 1.49.6;
Reduce ifdefs due to MULTIPROCESSOR slightly.

branches: 1.48.6; 1.48.8; 1.48.10; 1.48.12;
Merge vmlocking2 to head.

branches: 1.47.2; 1.47.6;
Remove the "struct lwp *" argument from all VFS and VOP interfaces.
The general trend is to remove it from all kernel interfaces and
this is a start. In case the calling lwp is desired, curlwp should
be used.

quick consensus on tech-kern

Merge from vmlocking.

branches: 1.45.2; 1.45.4;
Merge from vmlocking:

- Split vnode::v_flag into three fields, depending on field locking.
- simple_lock -> kmutex in a few places.
- Fix some simple locking problems.

branches: 1.44.4; 1.44.6; 1.44.8; 1.44.10;
Introduce WILLMAKE for vnode operations which create a new vnode.
Insert a KASSERT along the return path of such operations to check
that the operation set the vnode size.

branches: 1.43.8; 1.43.18;
Generate preprocessor macros for vop offsets in vfs op descs. And
use these symbols in the desc structures instead of magic numbers.
No functional change, except VOP_FOO_DESCOFFSET macros in vnode_if.h.

wrstuden ok

branches: 1.42.8; 1.42.10;
integrate kauth.

branches: 1.41.4; 1.41.6; 1.41.8; 1.41.10; 1.41.12;
merge ktrace-lwp.

Generate ANSI function decls.

Remove the VNODE_OP_NOINLINE option. We now NEVER inline vnode ops.
Briefly discussed on tech-kern not too long ago.

branches: 1.38.4;
remove some trailing spaces in generated output when removing $s from $NetBSD$

Change the DO NOT EDIT warning slightly, including the text "DO NOT EDIT".
(It is nice if all files that should not be edited have DO NOT EDIT in them.)

nuke trailing whitespace

branches: 1.35.4; 1.35.6;
Add a new VNODE_LOCKDEBUG option, which enables checks in the VOP_*()
calls to ensure that the vnode lock state is as expected when the VOP
call is made. Modify vnode_if.src to set the expected state according
to the documenting lock table for each VOP. Modify vnode_if.sh to emit
the checks.

Notes:
- The checks are only performed if the vnode has the VLOCKSWORK bit
set. Some file systems (e.g. specfs) don't even bother with vnode
locks, so of course the checks will fail.
- We can't actually run with VNODE_LOCKDEBUG because there are so many
vnode locking problems, not the least of which is the "use SHARED for
VOP_READ()" issue, which screws things up for the entire call chain.

Inspired by similar changes in OpenBSD, but implemented differently.

Make VOP_STRATEGY(bp) a real VOP as discussed on tech-kern.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.32.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

add RCSID to generated .c file

branches: 1.29.2; 1.29.6;
delint: vop_default_desc was declared const but not defined const.

branches: 1.28.2;
when generating individual *_desc, generate also proper offsets so that
then don't need to be patched at runtime
add new define VNODE_OPS_COUNT (to vnode_if.h) so that the number is known
at compile-time
make stuff const, it now can be

Remove over-const-ification.
This structures are actually modified at kernel init time by vfs_op_init.

XXX - looks like the state after initialization is pretty const and with
some magic in the generator script (and appropriate changes to vfs_op_init)
it could be made const.

constify

Make that defined(LKM) || defined(_LKM), to catch both the cases
of compiling a kernel with LKM support and compiling an LKM.

LKM -> _LKM around opt_ include.

redo the previous correctly

avoid redefinition of VNODE_OP_NOINLINE

If building an LKM, always cause it to use the non-inline version
of the vnode ops, and if LKM support is included in the kernel,
always include the non-inline stubs regardless of whether or not
they're being used in the static kernel iamge.

Allow the VOP_*() calls to be un-inlined with the VNODE_OP_NOINLINE
kernel option. Saves 36k of kernel text on an i386 GENERIC. Useful
for install media kernels, small memory systems, embedded systems.

branches: 1.19.2;
Update syntax to support WILLUNLOCK and WILLPUT syntax. Change calls which
really vput to indicate that rather than just WILLRELE.

branches: 1.18.8;
Quote the backquotes in the double-quoted shell string, otherwise they
disappear and you get AS IS'' instead of ``AS IS'' in the generated files.

branches: 1.17.2;
__Namespace__ __protection__.

Merge with Lite2 + local changes

Add RCS IDs to generated files, in correct place.

Back out RCS ID related changes.

fix RCS ids insertion so it really works

make script insert RCS ids into generated files

mark prototypes for static inline functions in the generated files as
possibly unused (with __attribute__ ((unused))), to avoid generating
warnings when compiling without optimization but with most ports' default
warning flags.

add multiple inclusion protection to generated header

Do not build vnode_if.[ch] for each kernel. Build them once, like the
various syscall sources/headers, and just compile them. From PR 2142, OK'd
by mycroft.

add prototypes before each inline

gwr's slightly cleaner way to do that last...

make output a bit cleaner, to satisfy mckusick.

don't use inline, use __inline, like cdefs intends (so it can kill it if nongcc

branches: 1.4.2;
New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

Get rid if 'set -f' (at Adam's request). It is unnecessary,
and not supported by sh on some systems (i.e. Ultrix).

No longer requires GNU awk (plain "nawk" is OK).
New AWK parser is simpler and makes better use of arrays.

branches: 1.1.1;
Update to 4.4-Lite fs code.

Make kqueue event status for vnodes shareable, and for stacked file systems
like nullfs, make the upper vnode share that status with the lower vnode.

And, lo, NetBSD 9.99.99.

Fixes PR kern/56713.

Really depend the lockdebug checks on option VNODE_LOCKDEBUG -- were
enabled by accident.

Make option VNODE_LOCKDEBUG more functional.

- Add "LOCKED=EXCL" option for vnode operations needing exclusive locked nodes.

- As it is impossible to check for shared locks held by current thread avoid
false assertions by testing for exclusive lock only in the "LOCKED=NO" case.

- New option "RUMP_VNODE_LOCKDEBUG" enables VNODE_LOCKDEBUG for the rump kernel.

Remove now unused VV_LOCKSWORK, all file systems support locking.

Remove unused predicates vn_locked() and vn_anylocked().

Welcome to 9.99.95

Overhaul of the EVFILT_VNODE kevent(2) filter:

- Centralize vnode kevent handling in the VOP_*() wrappers, rather than
forcing each individual file system to deal with it (except VOP_RENAME(),
because VOP_RENAME() is a mess and we currently have 2 different ways
of handling it; at least it's reasonably well-centralized in the "new"
way).
- Add support for NOTE_OPEN, NOTE_CLOSE, NOTE_CLOSE_WRITE, and NOTE_READ,
compatible with the same events in FreeBSD.
- Track which kevent notifications clients are interested in receiving
to avoid doing work for events no one cares about (avoiding, e.g.
taking locks and traversing the klist to send a NOTE_WRITE when
someone is merely watching for a file to be deleted, for example).

In support of the above:

- Add support in vnode_if.sh for specifying PRE- and POST-op handlers,
to be invoked before and after vop_pre() and vop_post(), respectively.
Basic idea from FreeBSD, but implemented differently.
- Add support in vnode_if.sh for specifying CONTEXT fields in the
vop_*_args structures. These context fields are used to convey information
between the file system VOP function and the VOP wrapper, but do not
occupy an argument slot in the VOP_*() call itself. These context fields
are initialized and subsequently interpreted by PRE- and POST-op handlers.
- Version VOP_REMOVE(), uses the a context field for the file system to report
back the resulting link count of the target vnode. Return this in tmpfs,
udf, nfs, chfs, ext2fs, lfs, and ufs.

NetBSD 9.99.92.

s/beween/between/

Add ACL support for FFS. From FreeBSD.

Merge from ad-namecache:

- Have a stab at clustering the members of vnode_t and vnode_impl_t in a
more cache-conscious way. With that done, go back to adjusting v_usecount
with atomics and keep vi_lock directly in vnode_impl_t (saves KVA).

- Allow VOP_LOCK(LK_NONE) for the benefit of VFS_VGET() and VFS_ROOT().
Make sure LK_UPGRADE always comes with LK_NOWAIT.

- Make cwdinfo use mostly lockless.

branches: 1.68.2;
Minor vnode locking changes:

- Stop using atomics to maniupulate v_usecount. It was a mistake to begin
with. It doesn't work as intended unless the XLOCK bit is incorporated in
v_usecount and we don't have that any more. When I introduced this 10+
years ago it was to reduce pressure on v_interlock but it doesn't do that,
it just makes stuff disappear from lockstat output and introduces problems
elsewhere. We could do atomic usecounts on vnodes but there has to be a
well thought out scheme.

- Resurrect LK_UPGRADE/LK_DOWNGRADE which will be needed to work effectively
when there is increased use of shared locks on vnodes.

- Allocate the vnode lock using rw_obj_alloc() to reduce false sharing of
struct vnode.

- Put all of the LRU lists into a single cache line, and do not requeue a
vnode if it's already on the correct list and was requeued recently (less
than a second ago).

Kernel build before and after:

119.63s real 1453.16s user 2742.57s system
115.29s real 1401.52s user 2690.94s system

As VOP_STRATEGY() usually calls itself on the file system holding "/dev"
it may deadlock on suspension of this file system.

Add fstrans type LAZY and use it for VOP_STRATEGY().

Adress PR kern/53624 (dom0 freeze on domU exit) is still there

branches: 1.66.6; 1.66.10;
Operations fstrans_start() and fstrans_start_nowait() now always
use FSTRANS_SHARED as lock type so remove the lock type argument.

Add "FSTRANS=LOCK" and "FSTRANS=UNLOCK" to vop_lock and vop_unlock.

Add two "static inline" functions to vnode_if.c to handle MPSAFE
and FSTRANS before and after the "VCALL()".

Take FSTRANS and handle error before "VCALL(...vop_lock...)" and
release it after "VCALL(...vop_unlock...)".

branches: 1.64.4;
Count vnode arguments correctly.

Don't count arguments that have WILLRELE/WILLPUT; count arguments
that are struct vnode *.

No functional change currently because it happens that every released
or put vnode argument comes first or after other ones.

Eliminate now-unused WILLUNLOCK vop flag.

Prepare to move fstrans into vnode_if.c, allow "FSTRANS=YES"
and "FSTRANS=NO" in the vop description.
Add fstrans_start()/fstrans_done() to all vops that have FSTRANS=YES
or have the first vnode unlocked.

branches: 1.61.2; 1.61.4;
"rump_private.h" -> <rump-sys/kern.h>

branches: 1.60.6;
Support for vnode operation versioning. Allow a new keyword "VERSION"
in the description so "VERSION 2" will change the name of the argument
from vop_XXX_args to vop_XXX_v2_args.

Additionally translate daddr_t to int64_t in the rumpvnode interface.
The type daddr_t is not available for all systems (e.g. Linux systems with
musl libc), and exposing it will just cause an unnecessary compilation
failure even if the type is not used.

branches: 1.58.2; 1.58.12; 1.58.16; 1.58.24;
Change VOP_BWRITE() to take a vnode as its first argument like all other
VOPs do. Layered file systems no longer have to modify bp->b_vp and run
into trouble when an async VOP_BWRITE() uses the wrong vnode.

Adresses PR kern/38762 panic: vwakeup: neg numoutput

No objections from tech-kern@.

- Use offsetof() in VOPARG_OFFSETOF() instead of re-implementing it.
- Remove VDESC_NOMAP_VPP and VDESC_VPP_WILLRELE.
- Remove VRELEL_NOINACTIVE and VRELEL_ONHEAD.

branches: 1.56.2;
Make rump vnode interface lightweight: the only things we
really need are:

0) provide VOP_OP in the alternate RUMP_VOP_OP namespace

and for each op:
1) schedule rump cpu
2) call VOP_OP
3) unschedule rump cpu

While here, take the opportunity to get rid of _t lossage in the
rump-exported interfaces.

Print "end of special cases" only where special cases end and not
a second time at the end of the file. Adjust whitespace for the
sheer functional joy of it.

(i hope i didn't ruin someone's joke by missing a humorous implication
that all vnode operations are considered a little special)

"Not yet" since 4.4BSD is quite a lot of "not yet", so remove
vdesc_transports from vnodeop_desc until we have a "not not yet"
situation.

Ride 5.99.27 bump (full build still in progress. i wanted to get
this in as soon as possible to most effectively ride the bump.)

branches: 1.53.2; 1.53.4;
Generate scheduling points around rump vnode operations.

Add a switch on whether to create VNODE_LOCKDEBUG checks or not.
Since VNODE_LOCKDEBUG has never been generally useful, default to
off. However, the checks can still be generated by flipping the
switch for the isolated cases where this form of dynamic analysis
is useful and the person using it knows what she is doing.

Split vfs out of rumpkern into rumpvfs. Non-fs rumps no longer
include the file system code. File system rumps explicitly need
to include rumpvfs from now on.

Make this generate the rump vnode interface files.

branches: 1.49.4; 1.49.6;
Reduce ifdefs due to MULTIPROCESSOR slightly.

branches: 1.48.6; 1.48.8; 1.48.10; 1.48.12;
Merge vmlocking2 to head.

branches: 1.47.2; 1.47.6;
Remove the "struct lwp *" argument from all VFS and VOP interfaces.
The general trend is to remove it from all kernel interfaces and
this is a start. In case the calling lwp is desired, curlwp should
be used.

quick consensus on tech-kern

Merge from vmlocking.

branches: 1.45.2; 1.45.4;
Merge from vmlocking:

- Split vnode::v_flag into three fields, depending on field locking.
- simple_lock -> kmutex in a few places.
- Fix some simple locking problems.

branches: 1.44.4; 1.44.6; 1.44.8; 1.44.10;
Introduce WILLMAKE for vnode operations which create a new vnode.
Insert a KASSERT along the return path of such operations to check
that the operation set the vnode size.

branches: 1.43.8; 1.43.18;
Generate preprocessor macros for vop offsets in vfs op descs. And
use these symbols in the desc structures instead of magic numbers.
No functional change, except VOP_FOO_DESCOFFSET macros in vnode_if.h.

wrstuden ok

branches: 1.42.8; 1.42.10;
integrate kauth.

branches: 1.41.4; 1.41.6; 1.41.8; 1.41.10; 1.41.12;
merge ktrace-lwp.

Generate ANSI function decls.

Remove the VNODE_OP_NOINLINE option. We now NEVER inline vnode ops.
Briefly discussed on tech-kern not too long ago.

branches: 1.38.4;
remove some trailing spaces in generated output when removing $s from $NetBSD$

Change the DO NOT EDIT warning slightly, including the text "DO NOT EDIT".
(It is nice if all files that should not be edited have DO NOT EDIT in them.)

nuke trailing whitespace

branches: 1.35.4; 1.35.6;
Add a new VNODE_LOCKDEBUG option, which enables checks in the VOP_*()
calls to ensure that the vnode lock state is as expected when the VOP
call is made. Modify vnode_if.src to set the expected state according
to the documenting lock table for each VOP. Modify vnode_if.sh to emit
the checks.

Notes:
- The checks are only performed if the vnode has the VLOCKSWORK bit
set. Some file systems (e.g. specfs) don't even bother with vnode
locks, so of course the checks will fail.
- We can't actually run with VNODE_LOCKDEBUG because there are so many
vnode locking problems, not the least of which is the "use SHARED for
VOP_READ()" issue, which screws things up for the entire call chain.

Inspired by similar changes in OpenBSD, but implemented differently.

Make VOP_STRATEGY(bp) a real VOP as discussed on tech-kern.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.32.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

add RCSID to generated .c file

branches: 1.29.2; 1.29.6;
delint: vop_default_desc was declared const but not defined const.

branches: 1.28.2;
when generating individual *_desc, generate also proper offsets so that
then don't need to be patched at runtime
add new define VNODE_OPS_COUNT (to vnode_if.h) so that the number is known
at compile-time
make stuff const, it now can be

Remove over-const-ification.
This structures are actually modified at kernel init time by vfs_op_init.

XXX - looks like the state after initialization is pretty const and with
some magic in the generator script (and appropriate changes to vfs_op_init)
it could be made const.

constify

Make that defined(LKM) || defined(_LKM), to catch both the cases
of compiling a kernel with LKM support and compiling an LKM.

LKM -> _LKM around opt_ include.

redo the previous correctly

avoid redefinition of VNODE_OP_NOINLINE

If building an LKM, always cause it to use the non-inline version
of the vnode ops, and if LKM support is included in the kernel,
always include the non-inline stubs regardless of whether or not
they're being used in the static kernel iamge.

Allow the VOP_*() calls to be un-inlined with the VNODE_OP_NOINLINE
kernel option. Saves 36k of kernel text on an i386 GENERIC. Useful
for install media kernels, small memory systems, embedded systems.

branches: 1.19.2;
Update syntax to support WILLUNLOCK and WILLPUT syntax. Change calls which
really vput to indicate that rather than just WILLRELE.

branches: 1.18.8;
Quote the backquotes in the double-quoted shell string, otherwise they
disappear and you get AS IS'' instead of ``AS IS'' in the generated files.

branches: 1.17.2;
__Namespace__ __protection__.

Merge with Lite2 + local changes

Add RCS IDs to generated files, in correct place.

Back out RCS ID related changes.

fix RCS ids insertion so it really works

make script insert RCS ids into generated files

mark prototypes for static inline functions in the generated files as
possibly unused (with __attribute__ ((unused))), to avoid generating
warnings when compiling without optimization but with most ports' default
warning flags.

add multiple inclusion protection to generated header

Do not build vnode_if.[ch] for each kernel. Build them once, like the
various syscall sources/headers, and just compile them. From PR 2142, OK'd
by mycroft.

add prototypes before each inline

gwr's slightly cleaner way to do that last...

make output a bit cleaner, to satisfy mckusick.

don't use inline, use __inline, like cdefs intends (so it can kill it if nongcc

branches: 1.4.2;
New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

Get rid if 'set -f' (at Adam's request). It is unnecessary,
and not supported by sh on some systems (i.e. Ultrix).

No longer requires GNU awk (plain "nawk" is OK).
New AWK parser is simpler and makes better use of arrays.

branches: 1.1.1;
Update to 4.4-Lite fs code.

Really depend the lockdebug checks on option VNODE_LOCKDEBUG -- were
enabled by accident.

Make option VNODE_LOCKDEBUG more functional.

- Add "LOCKED=EXCL" option for vnode operations needing exclusive locked nodes.

- As it is impossible to check for shared locks held by current thread avoid
false assertions by testing for exclusive lock only in the "LOCKED=NO" case.

- New option "RUMP_VNODE_LOCKDEBUG" enables VNODE_LOCKDEBUG for the rump kernel.

Remove now unused VV_LOCKSWORK, all file systems support locking.

Remove unused predicates vn_locked() and vn_anylocked().

Welcome to 9.99.95

Overhaul of the EVFILT_VNODE kevent(2) filter:

- Centralize vnode kevent handling in the VOP_*() wrappers, rather than
forcing each individual file system to deal with it (except VOP_RENAME(),
because VOP_RENAME() is a mess and we currently have 2 different ways
of handling it; at least it's reasonably well-centralized in the "new"
way).
- Add support for NOTE_OPEN, NOTE_CLOSE, NOTE_CLOSE_WRITE, and NOTE_READ,
compatible with the same events in FreeBSD.
- Track which kevent notifications clients are interested in receiving
to avoid doing work for events no one cares about (avoiding, e.g.
taking locks and traversing the klist to send a NOTE_WRITE when
someone is merely watching for a file to be deleted, for example).

In support of the above:

- Add support in vnode_if.sh for specifying PRE- and POST-op handlers,
to be invoked before and after vop_pre() and vop_post(), respectively.
Basic idea from FreeBSD, but implemented differently.
- Add support in vnode_if.sh for specifying CONTEXT fields in the
vop_*_args structures. These context fields are used to convey information
between the file system VOP function and the VOP wrapper, but do not
occupy an argument slot in the VOP_*() call itself. These context fields
are initialized and subsequently interpreted by PRE- and POST-op handlers.
- Version VOP_REMOVE(), uses the a context field for the file system to report
back the resulting link count of the target vnode. Return this in tmpfs,
udf, nfs, chfs, ext2fs, lfs, and ufs.

NetBSD 9.99.92.

s/beween/between/

Add ACL support for FFS. From FreeBSD.

Merge from ad-namecache:

- Have a stab at clustering the members of vnode_t and vnode_impl_t in a
more cache-conscious way. With that done, go back to adjusting v_usecount
with atomics and keep vi_lock directly in vnode_impl_t (saves KVA).

- Allow VOP_LOCK(LK_NONE) for the benefit of VFS_VGET() and VFS_ROOT().
Make sure LK_UPGRADE always comes with LK_NOWAIT.

- Make cwdinfo use mostly lockless.

branches: 1.68.2;
Minor vnode locking changes:

- Stop using atomics to maniupulate v_usecount. It was a mistake to begin
with. It doesn't work as intended unless the XLOCK bit is incorporated in
v_usecount and we don't have that any more. When I introduced this 10+
years ago it was to reduce pressure on v_interlock but it doesn't do that,
it just makes stuff disappear from lockstat output and introduces problems
elsewhere. We could do atomic usecounts on vnodes but there has to be a
well thought out scheme.

- Resurrect LK_UPGRADE/LK_DOWNGRADE which will be needed to work effectively
when there is increased use of shared locks on vnodes.

- Allocate the vnode lock using rw_obj_alloc() to reduce false sharing of
struct vnode.

- Put all of the LRU lists into a single cache line, and do not requeue a
vnode if it's already on the correct list and was requeued recently (less
than a second ago).

Kernel build before and after:

119.63s real 1453.16s user 2742.57s system
115.29s real 1401.52s user 2690.94s system

As VOP_STRATEGY() usually calls itself on the file system holding "/dev"
it may deadlock on suspension of this file system.

Add fstrans type LAZY and use it for VOP_STRATEGY().

Adress PR kern/53624 (dom0 freeze on domU exit) is still there

branches: 1.66.6; 1.66.10;
Operations fstrans_start() and fstrans_start_nowait() now always
use FSTRANS_SHARED as lock type so remove the lock type argument.

Add "FSTRANS=LOCK" and "FSTRANS=UNLOCK" to vop_lock and vop_unlock.

Add two "static inline" functions to vnode_if.c to handle MPSAFE
and FSTRANS before and after the "VCALL()".

Take FSTRANS and handle error before "VCALL(...vop_lock...)" and
release it after "VCALL(...vop_unlock...)".

branches: 1.64.4;
Count vnode arguments correctly.

Don't count arguments that have WILLRELE/WILLPUT; count arguments
that are struct vnode *.

No functional change currently because it happens that every released
or put vnode argument comes first or after other ones.

Eliminate now-unused WILLUNLOCK vop flag.

Prepare to move fstrans into vnode_if.c, allow "FSTRANS=YES"
and "FSTRANS=NO" in the vop description.
Add fstrans_start()/fstrans_done() to all vops that have FSTRANS=YES
or have the first vnode unlocked.

branches: 1.61.2; 1.61.4;
"rump_private.h" -> <rump-sys/kern.h>

branches: 1.60.6;
Support for vnode operation versioning. Allow a new keyword "VERSION"
in the description so "VERSION 2" will change the name of the argument
from vop_XXX_args to vop_XXX_v2_args.

Additionally translate daddr_t to int64_t in the rumpvnode interface.
The type daddr_t is not available for all systems (e.g. Linux systems with
musl libc), and exposing it will just cause an unnecessary compilation
failure even if the type is not used.

branches: 1.58.2; 1.58.12; 1.58.16; 1.58.24;
Change VOP_BWRITE() to take a vnode as its first argument like all other
VOPs do. Layered file systems no longer have to modify bp->b_vp and run
into trouble when an async VOP_BWRITE() uses the wrong vnode.

Adresses PR kern/38762 panic: vwakeup: neg numoutput

No objections from tech-kern@.

- Use offsetof() in VOPARG_OFFSETOF() instead of re-implementing it.
- Remove VDESC_NOMAP_VPP and VDESC_VPP_WILLRELE.
- Remove VRELEL_NOINACTIVE and VRELEL_ONHEAD.

branches: 1.56.2;
Make rump vnode interface lightweight: the only things we
really need are:

0) provide VOP_OP in the alternate RUMP_VOP_OP namespace

and for each op:
1) schedule rump cpu
2) call VOP_OP
3) unschedule rump cpu

While here, take the opportunity to get rid of _t lossage in the
rump-exported interfaces.

Print "end of special cases" only where special cases end and not
a second time at the end of the file. Adjust whitespace for the
sheer functional joy of it.

(i hope i didn't ruin someone's joke by missing a humorous implication
that all vnode operations are considered a little special)

"Not yet" since 4.4BSD is quite a lot of "not yet", so remove
vdesc_transports from vnodeop_desc until we have a "not not yet"
situation.

Ride 5.99.27 bump (full build still in progress. i wanted to get
this in as soon as possible to most effectively ride the bump.)

branches: 1.53.2; 1.53.4;
Generate scheduling points around rump vnode operations.

Add a switch on whether to create VNODE_LOCKDEBUG checks or not.
Since VNODE_LOCKDEBUG has never been generally useful, default to
off. However, the checks can still be generated by flipping the
switch for the isolated cases where this form of dynamic analysis
is useful and the person using it knows what she is doing.

Split vfs out of rumpkern into rumpvfs. Non-fs rumps no longer
include the file system code. File system rumps explicitly need
to include rumpvfs from now on.

Make this generate the rump vnode interface files.

branches: 1.49.4; 1.49.6;
Reduce ifdefs due to MULTIPROCESSOR slightly.

branches: 1.48.6; 1.48.8; 1.48.10; 1.48.12;
Merge vmlocking2 to head.

branches: 1.47.2; 1.47.6;
Remove the "struct lwp *" argument from all VFS and VOP interfaces.
The general trend is to remove it from all kernel interfaces and
this is a start. In case the calling lwp is desired, curlwp should
be used.

quick consensus on tech-kern

Merge from vmlocking.

branches: 1.45.2; 1.45.4;
Merge from vmlocking:

- Split vnode::v_flag into three fields, depending on field locking.
- simple_lock -> kmutex in a few places.
- Fix some simple locking problems.

branches: 1.44.4; 1.44.6; 1.44.8; 1.44.10;
Introduce WILLMAKE for vnode operations which create a new vnode.
Insert a KASSERT along the return path of such operations to check
that the operation set the vnode size.

branches: 1.43.8; 1.43.18;
Generate preprocessor macros for vop offsets in vfs op descs. And
use these symbols in the desc structures instead of magic numbers.
No functional change, except VOP_FOO_DESCOFFSET macros in vnode_if.h.

wrstuden ok

branches: 1.42.8; 1.42.10;
integrate kauth.

branches: 1.41.4; 1.41.6; 1.41.8; 1.41.10; 1.41.12;
merge ktrace-lwp.

Generate ANSI function decls.

Remove the VNODE_OP_NOINLINE option. We now NEVER inline vnode ops.
Briefly discussed on tech-kern not too long ago.

branches: 1.38.4;
remove some trailing spaces in generated output when removing $s from $NetBSD$

Change the DO NOT EDIT warning slightly, including the text "DO NOT EDIT".
(It is nice if all files that should not be edited have DO NOT EDIT in them.)

nuke trailing whitespace

branches: 1.35.4; 1.35.6;
Add a new VNODE_LOCKDEBUG option, which enables checks in the VOP_*()
calls to ensure that the vnode lock state is as expected when the VOP
call is made. Modify vnode_if.src to set the expected state according
to the documenting lock table for each VOP. Modify vnode_if.sh to emit
the checks.

Notes:
- The checks are only performed if the vnode has the VLOCKSWORK bit
set. Some file systems (e.g. specfs) don't even bother with vnode
locks, so of course the checks will fail.
- We can't actually run with VNODE_LOCKDEBUG because there are so many
vnode locking problems, not the least of which is the "use SHARED for
VOP_READ()" issue, which screws things up for the entire call chain.

Inspired by similar changes in OpenBSD, but implemented differently.

Make VOP_STRATEGY(bp) a real VOP as discussed on tech-kern.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.32.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

add RCSID to generated .c file

branches: 1.29.2; 1.29.6;
delint: vop_default_desc was declared const but not defined const.

branches: 1.28.2;
when generating individual *_desc, generate also proper offsets so that
then don't need to be patched at runtime
add new define VNODE_OPS_COUNT (to vnode_if.h) so that the number is known
at compile-time
make stuff const, it now can be

Remove over-const-ification.
This structures are actually modified at kernel init time by vfs_op_init.

XXX - looks like the state after initialization is pretty const and with
some magic in the generator script (and appropriate changes to vfs_op_init)
it could be made const.

constify

Make that defined(LKM) || defined(_LKM), to catch both the cases
of compiling a kernel with LKM support and compiling an LKM.

LKM -> _LKM around opt_ include.

redo the previous correctly

avoid redefinition of VNODE_OP_NOINLINE

If building an LKM, always cause it to use the non-inline version
of the vnode ops, and if LKM support is included in the kernel,
always include the non-inline stubs regardless of whether or not
they're being used in the static kernel iamge.

Allow the VOP_*() calls to be un-inlined with the VNODE_OP_NOINLINE
kernel option. Saves 36k of kernel text on an i386 GENERIC. Useful
for install media kernels, small memory systems, embedded systems.

branches: 1.19.2;
Update syntax to support WILLUNLOCK and WILLPUT syntax. Change calls which
really vput to indicate that rather than just WILLRELE.

branches: 1.18.8;
Quote the backquotes in the double-quoted shell string, otherwise they
disappear and you get AS IS'' instead of ``AS IS'' in the generated files.

branches: 1.17.2;
__Namespace__ __protection__.

Merge with Lite2 + local changes

Add RCS IDs to generated files, in correct place.

Back out RCS ID related changes.

fix RCS ids insertion so it really works

make script insert RCS ids into generated files

mark prototypes for static inline functions in the generated files as
possibly unused (with __attribute__ ((unused))), to avoid generating
warnings when compiling without optimization but with most ports' default
warning flags.

add multiple inclusion protection to generated header

Do not build vnode_if.[ch] for each kernel. Build them once, like the
various syscall sources/headers, and just compile them. From PR 2142, OK'd
by mycroft.

add prototypes before each inline

gwr's slightly cleaner way to do that last...

make output a bit cleaner, to satisfy mckusick.

don't use inline, use __inline, like cdefs intends (so it can kill it if nongcc

branches: 1.4.2;
New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

Get rid if 'set -f' (at Adam's request). It is unnecessary,
and not supported by sh on some systems (i.e. Ultrix).

No longer requires GNU awk (plain "nawk" is OK).
New AWK parser is simpler and makes better use of arrays.

branches: 1.1.1;
Update to 4.4-Lite fs code.

Really depend the lockdebug checks on option VNODE_LOCKDEBUG -- were
enabled by accident.

Make option VNODE_LOCKDEBUG more functional.

- Add "LOCKED=EXCL" option for vnode operations needing exclusive locked nodes.

- As it is impossible to check for shared locks held by current thread avoid
false assertions by testing for exclusive lock only in the "LOCKED=NO" case.

- New option "RUMP_VNODE_LOCKDEBUG" enables VNODE_LOCKDEBUG for the rump kernel.

Remove now unused VV_LOCKSWORK, all file systems support locking.

Remove unused predicates vn_locked() and vn_anylocked().

Welcome to 9.99.95

Overhaul of the EVFILT_VNODE kevent(2) filter:

- Centralize vnode kevent handling in the VOP_*() wrappers, rather than
forcing each individual file system to deal with it (except VOP_RENAME(),
because VOP_RENAME() is a mess and we currently have 2 different ways
of handling it; at least it's reasonably well-centralized in the "new"
way).
- Add support for NOTE_OPEN, NOTE_CLOSE, NOTE_CLOSE_WRITE, and NOTE_READ,
compatible with the same events in FreeBSD.
- Track which kevent notifications clients are interested in receiving
to avoid doing work for events no one cares about (avoiding, e.g.
taking locks and traversing the klist to send a NOTE_WRITE when
someone is merely watching for a file to be deleted, for example).

In support of the above:

- Add support in vnode_if.sh for specifying PRE- and POST-op handlers,
to be invoked before and after vop_pre() and vop_post(), respectively.
Basic idea from FreeBSD, but implemented differently.
- Add support in vnode_if.sh for specifying CONTEXT fields in the
vop_*_args structures. These context fields are used to convey information
between the file system VOP function and the VOP wrapper, but do not
occupy an argument slot in the VOP_*() call itself. These context fields
are initialized and subsequently interpreted by PRE- and POST-op handlers.
- Version VOP_REMOVE(), uses the a context field for the file system to report
back the resulting link count of the target vnode. Return this in tmpfs,
udf, nfs, chfs, ext2fs, lfs, and ufs.

NetBSD 9.99.92.

s/beween/between/

Add ACL support for FFS. From FreeBSD.

Merge from ad-namecache:

- Have a stab at clustering the members of vnode_t and vnode_impl_t in a
more cache-conscious way. With that done, go back to adjusting v_usecount
with atomics and keep vi_lock directly in vnode_impl_t (saves KVA).

- Allow VOP_LOCK(LK_NONE) for the benefit of VFS_VGET() and VFS_ROOT().
Make sure LK_UPGRADE always comes with LK_NOWAIT.

- Make cwdinfo use mostly lockless.

branches: 1.68.2;
Minor vnode locking changes:

- Stop using atomics to maniupulate v_usecount. It was a mistake to begin
with. It doesn't work as intended unless the XLOCK bit is incorporated in
v_usecount and we don't have that any more. When I introduced this 10+
years ago it was to reduce pressure on v_interlock but it doesn't do that,
it just makes stuff disappear from lockstat output and introduces problems
elsewhere. We could do atomic usecounts on vnodes but there has to be a
well thought out scheme.

- Resurrect LK_UPGRADE/LK_DOWNGRADE which will be needed to work effectively
when there is increased use of shared locks on vnodes.

- Allocate the vnode lock using rw_obj_alloc() to reduce false sharing of
struct vnode.

- Put all of the LRU lists into a single cache line, and do not requeue a
vnode if it's already on the correct list and was requeued recently (less
than a second ago).

Kernel build before and after:

119.63s real 1453.16s user 2742.57s system
115.29s real 1401.52s user 2690.94s system

As VOP_STRATEGY() usually calls itself on the file system holding "/dev"
it may deadlock on suspension of this file system.

Add fstrans type LAZY and use it for VOP_STRATEGY().

Adress PR kern/53624 (dom0 freeze on domU exit) is still there

branches: 1.66.6; 1.66.10;
Operations fstrans_start() and fstrans_start_nowait() now always
use FSTRANS_SHARED as lock type so remove the lock type argument.

Add "FSTRANS=LOCK" and "FSTRANS=UNLOCK" to vop_lock and vop_unlock.

Add two "static inline" functions to vnode_if.c to handle MPSAFE
and FSTRANS before and after the "VCALL()".

Take FSTRANS and handle error before "VCALL(...vop_lock...)" and
release it after "VCALL(...vop_unlock...)".

branches: 1.64.4;
Count vnode arguments correctly.

Don't count arguments that have WILLRELE/WILLPUT; count arguments
that are struct vnode *.

No functional change currently because it happens that every released
or put vnode argument comes first or after other ones.

Eliminate now-unused WILLUNLOCK vop flag.

Prepare to move fstrans into vnode_if.c, allow "FSTRANS=YES"
and "FSTRANS=NO" in the vop description.
Add fstrans_start()/fstrans_done() to all vops that have FSTRANS=YES
or have the first vnode unlocked.

branches: 1.61.2; 1.61.4;
"rump_private.h" -> <rump-sys/kern.h>

branches: 1.60.6;
Support for vnode operation versioning. Allow a new keyword "VERSION"
in the description so "VERSION 2" will change the name of the argument
from vop_XXX_args to vop_XXX_v2_args.

Additionally translate daddr_t to int64_t in the rumpvnode interface.
The type daddr_t is not available for all systems (e.g. Linux systems with
musl libc), and exposing it will just cause an unnecessary compilation
failure even if the type is not used.

branches: 1.58.2; 1.58.12; 1.58.16; 1.58.24;
Change VOP_BWRITE() to take a vnode as its first argument like all other
VOPs do. Layered file systems no longer have to modify bp->b_vp and run
into trouble when an async VOP_BWRITE() uses the wrong vnode.

Adresses PR kern/38762 panic: vwakeup: neg numoutput

No objections from tech-kern@.

- Use offsetof() in VOPARG_OFFSETOF() instead of re-implementing it.
- Remove VDESC_NOMAP_VPP and VDESC_VPP_WILLRELE.
- Remove VRELEL_NOINACTIVE and VRELEL_ONHEAD.

branches: 1.56.2;
Make rump vnode interface lightweight: the only things we
really need are:

0) provide VOP_OP in the alternate RUMP_VOP_OP namespace

and for each op:
1) schedule rump cpu
2) call VOP_OP
3) unschedule rump cpu

While here, take the opportunity to get rid of _t lossage in the
rump-exported interfaces.

Print "end of special cases" only where special cases end and not
a second time at the end of the file. Adjust whitespace for the
sheer functional joy of it.

(i hope i didn't ruin someone's joke by missing a humorous implication
that all vnode operations are considered a little special)

"Not yet" since 4.4BSD is quite a lot of "not yet", so remove
vdesc_transports from vnodeop_desc until we have a "not not yet"
situation.

Ride 5.99.27 bump (full build still in progress. i wanted to get
this in as soon as possible to most effectively ride the bump.)

branches: 1.53.2; 1.53.4;
Generate scheduling points around rump vnode operations.

Add a switch on whether to create VNODE_LOCKDEBUG checks or not.
Since VNODE_LOCKDEBUG has never been generally useful, default to
off. However, the checks can still be generated by flipping the
switch for the isolated cases where this form of dynamic analysis
is useful and the person using it knows what she is doing.

Split vfs out of rumpkern into rumpvfs. Non-fs rumps no longer
include the file system code. File system rumps explicitly need
to include rumpvfs from now on.

Make this generate the rump vnode interface files.

branches: 1.49.4; 1.49.6;
Reduce ifdefs due to MULTIPROCESSOR slightly.

branches: 1.48.6; 1.48.8; 1.48.10; 1.48.12;
Merge vmlocking2 to head.

branches: 1.47.2; 1.47.6;
Remove the "struct lwp *" argument from all VFS and VOP interfaces.
The general trend is to remove it from all kernel interfaces and
this is a start. In case the calling lwp is desired, curlwp should
be used.

quick consensus on tech-kern

Merge from vmlocking.

branches: 1.45.2; 1.45.4;
Merge from vmlocking:

- Split vnode::v_flag into three fields, depending on field locking.
- simple_lock -> kmutex in a few places.
- Fix some simple locking problems.

branches: 1.44.4; 1.44.6; 1.44.8; 1.44.10;
Introduce WILLMAKE for vnode operations which create a new vnode.
Insert a KASSERT along the return path of such operations to check
that the operation set the vnode size.

branches: 1.43.8; 1.43.18;
Generate preprocessor macros for vop offsets in vfs op descs. And
use these symbols in the desc structures instead of magic numbers.
No functional change, except VOP_FOO_DESCOFFSET macros in vnode_if.h.

wrstuden ok

branches: 1.42.8; 1.42.10;
integrate kauth.

branches: 1.41.4; 1.41.6; 1.41.8; 1.41.10; 1.41.12;
merge ktrace-lwp.

Generate ANSI function decls.

Remove the VNODE_OP_NOINLINE option. We now NEVER inline vnode ops.
Briefly discussed on tech-kern not too long ago.

branches: 1.38.4;
remove some trailing spaces in generated output when removing $s from $NetBSD$

Change the DO NOT EDIT warning slightly, including the text "DO NOT EDIT".
(It is nice if all files that should not be edited have DO NOT EDIT in them.)

nuke trailing whitespace

branches: 1.35.4; 1.35.6;
Add a new VNODE_LOCKDEBUG option, which enables checks in the VOP_*()
calls to ensure that the vnode lock state is as expected when the VOP
call is made. Modify vnode_if.src to set the expected state according
to the documenting lock table for each VOP. Modify vnode_if.sh to emit
the checks.

Notes:
- The checks are only performed if the vnode has the VLOCKSWORK bit
set. Some file systems (e.g. specfs) don't even bother with vnode
locks, so of course the checks will fail.
- We can't actually run with VNODE_LOCKDEBUG because there are so many
vnode locking problems, not the least of which is the "use SHARED for
VOP_READ()" issue, which screws things up for the entire call chain.

Inspired by similar changes in OpenBSD, but implemented differently.

Make VOP_STRATEGY(bp) a real VOP as discussed on tech-kern.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.32.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

add RCSID to generated .c file

branches: 1.29.2; 1.29.6;
delint: vop_default_desc was declared const but not defined const.

branches: 1.28.2;
when generating individual *_desc, generate also proper offsets so that
then don't need to be patched at runtime
add new define VNODE_OPS_COUNT (to vnode_if.h) so that the number is known
at compile-time
make stuff const, it now can be

Remove over-const-ification.
This structures are actually modified at kernel init time by vfs_op_init.

XXX - looks like the state after initialization is pretty const and with
some magic in the generator script (and appropriate changes to vfs_op_init)
it could be made const.

constify

Make that defined(LKM) || defined(_LKM), to catch both the cases
of compiling a kernel with LKM support and compiling an LKM.

LKM -> _LKM around opt_ include.

redo the previous correctly

avoid redefinition of VNODE_OP_NOINLINE

If building an LKM, always cause it to use the non-inline version
of the vnode ops, and if LKM support is included in the kernel,
always include the non-inline stubs regardless of whether or not
they're being used in the static kernel iamge.

Allow the VOP_*() calls to be un-inlined with the VNODE_OP_NOINLINE
kernel option. Saves 36k of kernel text on an i386 GENERIC. Useful
for install media kernels, small memory systems, embedded systems.

branches: 1.19.2;
Update syntax to support WILLUNLOCK and WILLPUT syntax. Change calls which
really vput to indicate that rather than just WILLRELE.

branches: 1.18.8;
Quote the backquotes in the double-quoted shell string, otherwise they
disappear and you get AS IS'' instead of ``AS IS'' in the generated files.

branches: 1.17.2;
__Namespace__ __protection__.

Merge with Lite2 + local changes

Add RCS IDs to generated files, in correct place.

Back out RCS ID related changes.

fix RCS ids insertion so it really works

make script insert RCS ids into generated files

mark prototypes for static inline functions in the generated files as
possibly unused (with __attribute__ ((unused))), to avoid generating
warnings when compiling without optimization but with most ports' default
warning flags.

add multiple inclusion protection to generated header

Do not build vnode_if.[ch] for each kernel. Build them once, like the
various syscall sources/headers, and just compile them. From PR 2142, OK'd
by mycroft.

add prototypes before each inline

gwr's slightly cleaner way to do that last...

make output a bit cleaner, to satisfy mckusick.

don't use inline, use __inline, like cdefs intends (so it can kill it if nongcc

branches: 1.4.2;
New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

Get rid if 'set -f' (at Adam's request). It is unnecessary,
and not supported by sh on some systems (i.e. Ultrix).

No longer requires GNU awk (plain "nawk" is OK).
New AWK parser is simpler and makes better use of arrays.

branches: 1.1.1;
Update to 4.4-Lite fs code.

Remove now unused VV_LOCKSWORK, all file systems support locking.

Remove unused predicates vn_locked() and vn_anylocked().

Welcome to 9.99.95

Overhaul of the EVFILT_VNODE kevent(2) filter:

- Centralize vnode kevent handling in the VOP_*() wrappers, rather than
forcing each individual file system to deal with it (except VOP_RENAME(),
because VOP_RENAME() is a mess and we currently have 2 different ways
of handling it; at least it's reasonably well-centralized in the "new"
way).
- Add support for NOTE_OPEN, NOTE_CLOSE, NOTE_CLOSE_WRITE, and NOTE_READ,
compatible with the same events in FreeBSD.
- Track which kevent notifications clients are interested in receiving
to avoid doing work for events no one cares about (avoiding, e.g.
taking locks and traversing the klist to send a NOTE_WRITE when
someone is merely watching for a file to be deleted, for example).

In support of the above:

- Add support in vnode_if.sh for specifying PRE- and POST-op handlers,
to be invoked before and after vop_pre() and vop_post(), respectively.
Basic idea from FreeBSD, but implemented differently.
- Add support in vnode_if.sh for specifying CONTEXT fields in the
vop_*_args structures. These context fields are used to convey information
between the file system VOP function and the VOP wrapper, but do not
occupy an argument slot in the VOP_*() call itself. These context fields
are initialized and subsequently interpreted by PRE- and POST-op handlers.
- Version VOP_REMOVE(), uses the a context field for the file system to report
back the resulting link count of the target vnode. Return this in tmpfs,
udf, nfs, chfs, ext2fs, lfs, and ufs.

NetBSD 9.99.92.

s/beween/between/

Add ACL support for FFS. From FreeBSD.

Merge from ad-namecache:

- Have a stab at clustering the members of vnode_t and vnode_impl_t in a
more cache-conscious way. With that done, go back to adjusting v_usecount
with atomics and keep vi_lock directly in vnode_impl_t (saves KVA).

- Allow VOP_LOCK(LK_NONE) for the benefit of VFS_VGET() and VFS_ROOT().
Make sure LK_UPGRADE always comes with LK_NOWAIT.

- Make cwdinfo use mostly lockless.

branches: 1.68.2;
Minor vnode locking changes:

- Stop using atomics to maniupulate v_usecount. It was a mistake to begin
with. It doesn't work as intended unless the XLOCK bit is incorporated in
v_usecount and we don't have that any more. When I introduced this 10+
years ago it was to reduce pressure on v_interlock but it doesn't do that,
it just makes stuff disappear from lockstat output and introduces problems
elsewhere. We could do atomic usecounts on vnodes but there has to be a
well thought out scheme.

- Resurrect LK_UPGRADE/LK_DOWNGRADE which will be needed to work effectively
when there is increased use of shared locks on vnodes.

- Allocate the vnode lock using rw_obj_alloc() to reduce false sharing of
struct vnode.

- Put all of the LRU lists into a single cache line, and do not requeue a
vnode if it's already on the correct list and was requeued recently (less
than a second ago).

Kernel build before and after:

119.63s real 1453.16s user 2742.57s system
115.29s real 1401.52s user 2690.94s system

As VOP_STRATEGY() usually calls itself on the file system holding "/dev"
it may deadlock on suspension of this file system.

Add fstrans type LAZY and use it for VOP_STRATEGY().

Adress PR kern/53624 (dom0 freeze on domU exit) is still there

branches: 1.66.6; 1.66.10;
Operations fstrans_start() and fstrans_start_nowait() now always
use FSTRANS_SHARED as lock type so remove the lock type argument.

Add "FSTRANS=LOCK" and "FSTRANS=UNLOCK" to vop_lock and vop_unlock.

Add two "static inline" functions to vnode_if.c to handle MPSAFE
and FSTRANS before and after the "VCALL()".

Take FSTRANS and handle error before "VCALL(...vop_lock...)" and
release it after "VCALL(...vop_unlock...)".

branches: 1.64.4;
Count vnode arguments correctly.

Don't count arguments that have WILLRELE/WILLPUT; count arguments
that are struct vnode *.

No functional change currently because it happens that every released
or put vnode argument comes first or after other ones.

Eliminate now-unused WILLUNLOCK vop flag.

Prepare to move fstrans into vnode_if.c, allow "FSTRANS=YES"
and "FSTRANS=NO" in the vop description.
Add fstrans_start()/fstrans_done() to all vops that have FSTRANS=YES
or have the first vnode unlocked.

branches: 1.61.2; 1.61.4;
"rump_private.h" -> <rump-sys/kern.h>

branches: 1.60.6;
Support for vnode operation versioning. Allow a new keyword "VERSION"
in the description so "VERSION 2" will change the name of the argument
from vop_XXX_args to vop_XXX_v2_args.

Additionally translate daddr_t to int64_t in the rumpvnode interface.
The type daddr_t is not available for all systems (e.g. Linux systems with
musl libc), and exposing it will just cause an unnecessary compilation
failure even if the type is not used.

branches: 1.58.2; 1.58.12; 1.58.16; 1.58.24;
Change VOP_BWRITE() to take a vnode as its first argument like all other
VOPs do. Layered file systems no longer have to modify bp->b_vp and run
into trouble when an async VOP_BWRITE() uses the wrong vnode.

Adresses PR kern/38762 panic: vwakeup: neg numoutput

No objections from tech-kern@.

- Use offsetof() in VOPARG_OFFSETOF() instead of re-implementing it.
- Remove VDESC_NOMAP_VPP and VDESC_VPP_WILLRELE.
- Remove VRELEL_NOINACTIVE and VRELEL_ONHEAD.

branches: 1.56.2;
Make rump vnode interface lightweight: the only things we
really need are:

0) provide VOP_OP in the alternate RUMP_VOP_OP namespace

and for each op:
1) schedule rump cpu
2) call VOP_OP
3) unschedule rump cpu

While here, take the opportunity to get rid of _t lossage in the
rump-exported interfaces.

Print "end of special cases" only where special cases end and not
a second time at the end of the file. Adjust whitespace for the
sheer functional joy of it.

(i hope i didn't ruin someone's joke by missing a humorous implication
that all vnode operations are considered a little special)

"Not yet" since 4.4BSD is quite a lot of "not yet", so remove
vdesc_transports from vnodeop_desc until we have a "not not yet"
situation.

Ride 5.99.27 bump (full build still in progress. i wanted to get
this in as soon as possible to most effectively ride the bump.)

branches: 1.53.2; 1.53.4;
Generate scheduling points around rump vnode operations.

Add a switch on whether to create VNODE_LOCKDEBUG checks or not.
Since VNODE_LOCKDEBUG has never been generally useful, default to
off. However, the checks can still be generated by flipping the
switch for the isolated cases where this form of dynamic analysis
is useful and the person using it knows what she is doing.

Split vfs out of rumpkern into rumpvfs. Non-fs rumps no longer
include the file system code. File system rumps explicitly need
to include rumpvfs from now on.

Make this generate the rump vnode interface files.

branches: 1.49.4; 1.49.6;
Reduce ifdefs due to MULTIPROCESSOR slightly.

branches: 1.48.6; 1.48.8; 1.48.10; 1.48.12;
Merge vmlocking2 to head.

branches: 1.47.2; 1.47.6;
Remove the "struct lwp *" argument from all VFS and VOP interfaces.
The general trend is to remove it from all kernel interfaces and
this is a start. In case the calling lwp is desired, curlwp should
be used.

quick consensus on tech-kern

Merge from vmlocking.

branches: 1.45.2; 1.45.4;
Merge from vmlocking:

- Split vnode::v_flag into three fields, depending on field locking.
- simple_lock -> kmutex in a few places.
- Fix some simple locking problems.

branches: 1.44.4; 1.44.6; 1.44.8; 1.44.10;
Introduce WILLMAKE for vnode operations which create a new vnode.
Insert a KASSERT along the return path of such operations to check
that the operation set the vnode size.

branches: 1.43.8; 1.43.18;
Generate preprocessor macros for vop offsets in vfs op descs. And
use these symbols in the desc structures instead of magic numbers.
No functional change, except VOP_FOO_DESCOFFSET macros in vnode_if.h.

wrstuden ok

branches: 1.42.8; 1.42.10;
integrate kauth.

branches: 1.41.4; 1.41.6; 1.41.8; 1.41.10; 1.41.12;
merge ktrace-lwp.

Generate ANSI function decls.

Remove the VNODE_OP_NOINLINE option. We now NEVER inline vnode ops.
Briefly discussed on tech-kern not too long ago.

branches: 1.38.4;
remove some trailing spaces in generated output when removing $s from $NetBSD$

Change the DO NOT EDIT warning slightly, including the text "DO NOT EDIT".
(It is nice if all files that should not be edited have DO NOT EDIT in them.)

nuke trailing whitespace

branches: 1.35.4; 1.35.6;
Add a new VNODE_LOCKDEBUG option, which enables checks in the VOP_*()
calls to ensure that the vnode lock state is as expected when the VOP
call is made. Modify vnode_if.src to set the expected state according
to the documenting lock table for each VOP. Modify vnode_if.sh to emit
the checks.

Notes:
- The checks are only performed if the vnode has the VLOCKSWORK bit
set. Some file systems (e.g. specfs) don't even bother with vnode
locks, so of course the checks will fail.
- We can't actually run with VNODE_LOCKDEBUG because there are so many
vnode locking problems, not the least of which is the "use SHARED for
VOP_READ()" issue, which screws things up for the entire call chain.

Inspired by similar changes in OpenBSD, but implemented differently.

Make VOP_STRATEGY(bp) a real VOP as discussed on tech-kern.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.32.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

add RCSID to generated .c file

branches: 1.29.2; 1.29.6;
delint: vop_default_desc was declared const but not defined const.

branches: 1.28.2;
when generating individual *_desc, generate also proper offsets so that
then don't need to be patched at runtime
add new define VNODE_OPS_COUNT (to vnode_if.h) so that the number is known
at compile-time
make stuff const, it now can be

Remove over-const-ification.
This structures are actually modified at kernel init time by vfs_op_init.

XXX - looks like the state after initialization is pretty const and with
some magic in the generator script (and appropriate changes to vfs_op_init)
it could be made const.

constify

Make that defined(LKM) || defined(_LKM), to catch both the cases
of compiling a kernel with LKM support and compiling an LKM.

LKM -> _LKM around opt_ include.

redo the previous correctly

avoid redefinition of VNODE_OP_NOINLINE

If building an LKM, always cause it to use the non-inline version
of the vnode ops, and if LKM support is included in the kernel,
always include the non-inline stubs regardless of whether or not
they're being used in the static kernel iamge.

Allow the VOP_*() calls to be un-inlined with the VNODE_OP_NOINLINE
kernel option. Saves 36k of kernel text on an i386 GENERIC. Useful
for install media kernels, small memory systems, embedded systems.

branches: 1.19.2;
Update syntax to support WILLUNLOCK and WILLPUT syntax. Change calls which
really vput to indicate that rather than just WILLRELE.

branches: 1.18.8;
Quote the backquotes in the double-quoted shell string, otherwise they
disappear and you get AS IS'' instead of ``AS IS'' in the generated files.

branches: 1.17.2;
__Namespace__ __protection__.

Merge with Lite2 + local changes

Add RCS IDs to generated files, in correct place.

Back out RCS ID related changes.

fix RCS ids insertion so it really works

make script insert RCS ids into generated files

mark prototypes for static inline functions in the generated files as
possibly unused (with __attribute__ ((unused))), to avoid generating
warnings when compiling without optimization but with most ports' default
warning flags.

add multiple inclusion protection to generated header

Do not build vnode_if.[ch] for each kernel. Build them once, like the
various syscall sources/headers, and just compile them. From PR 2142, OK'd
by mycroft.

add prototypes before each inline

gwr's slightly cleaner way to do that last...

make output a bit cleaner, to satisfy mckusick.

don't use inline, use __inline, like cdefs intends (so it can kill it if nongcc

branches: 1.4.2;
New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

Get rid if 'set -f' (at Adam's request). It is unnecessary,
and not supported by sh on some systems (i.e. Ultrix).

No longer requires GNU awk (plain "nawk" is OK).
New AWK parser is simpler and makes better use of arrays.

branches: 1.1.1;
Update to 4.4-Lite fs code.

Overhaul of the EVFILT_VNODE kevent(2) filter:

- Centralize vnode kevent handling in the VOP_*() wrappers, rather than
forcing each individual file system to deal with it (except VOP_RENAME(),
because VOP_RENAME() is a mess and we currently have 2 different ways
of handling it; at least it's reasonably well-centralized in the "new"
way).
- Add support for NOTE_OPEN, NOTE_CLOSE, NOTE_CLOSE_WRITE, and NOTE_READ,
compatible with the same events in FreeBSD.
- Track which kevent notifications clients are interested in receiving
to avoid doing work for events no one cares about (avoiding, e.g.
taking locks and traversing the klist to send a NOTE_WRITE when
someone is merely watching for a file to be deleted, for example).

In support of the above:

- Add support in vnode_if.sh for specifying PRE- and POST-op handlers,
to be invoked before and after vop_pre() and vop_post(), respectively.
Basic idea from FreeBSD, but implemented differently.
- Add support in vnode_if.sh for specifying CONTEXT fields in the
vop_*_args structures. These context fields are used to convey information
between the file system VOP function and the VOP wrapper, but do not
occupy an argument slot in the VOP_*() call itself. These context fields
are initialized and subsequently interpreted by PRE- and POST-op handlers.
- Version VOP_REMOVE(), uses the a context field for the file system to report
back the resulting link count of the target vnode. Return this in tmpfs,
udf, nfs, chfs, ext2fs, lfs, and ufs.

NetBSD 9.99.92.

s/beween/between/

Add ACL support for FFS. From FreeBSD.

Merge from ad-namecache:

- Have a stab at clustering the members of vnode_t and vnode_impl_t in a
more cache-conscious way. With that done, go back to adjusting v_usecount
with atomics and keep vi_lock directly in vnode_impl_t (saves KVA).

- Allow VOP_LOCK(LK_NONE) for the benefit of VFS_VGET() and VFS_ROOT().
Make sure LK_UPGRADE always comes with LK_NOWAIT.

- Make cwdinfo use mostly lockless.

branches: 1.68.2;
Minor vnode locking changes:

- Stop using atomics to maniupulate v_usecount. It was a mistake to begin
with. It doesn't work as intended unless the XLOCK bit is incorporated in
v_usecount and we don't have that any more. When I introduced this 10+
years ago it was to reduce pressure on v_interlock but it doesn't do that,
it just makes stuff disappear from lockstat output and introduces problems
elsewhere. We could do atomic usecounts on vnodes but there has to be a
well thought out scheme.

- Resurrect LK_UPGRADE/LK_DOWNGRADE which will be needed to work effectively
when there is increased use of shared locks on vnodes.

- Allocate the vnode lock using rw_obj_alloc() to reduce false sharing of
struct vnode.

- Put all of the LRU lists into a single cache line, and do not requeue a
vnode if it's already on the correct list and was requeued recently (less
than a second ago).

Kernel build before and after:

119.63s real 1453.16s user 2742.57s system
115.29s real 1401.52s user 2690.94s system

As VOP_STRATEGY() usually calls itself on the file system holding "/dev"
it may deadlock on suspension of this file system.

Add fstrans type LAZY and use it for VOP_STRATEGY().

Adress PR kern/53624 (dom0 freeze on domU exit) is still there

branches: 1.66.6; 1.66.10;
Operations fstrans_start() and fstrans_start_nowait() now always
use FSTRANS_SHARED as lock type so remove the lock type argument.

Add "FSTRANS=LOCK" and "FSTRANS=UNLOCK" to vop_lock and vop_unlock.

Add two "static inline" functions to vnode_if.c to handle MPSAFE
and FSTRANS before and after the "VCALL()".

Take FSTRANS and handle error before "VCALL(...vop_lock...)" and
release it after "VCALL(...vop_unlock...)".

branches: 1.64.4;
Count vnode arguments correctly.

Don't count arguments that have WILLRELE/WILLPUT; count arguments
that are struct vnode *.

No functional change currently because it happens that every released
or put vnode argument comes first or after other ones.

Eliminate now-unused WILLUNLOCK vop flag.

Prepare to move fstrans into vnode_if.c, allow "FSTRANS=YES"
and "FSTRANS=NO" in the vop description.
Add fstrans_start()/fstrans_done() to all vops that have FSTRANS=YES
or have the first vnode unlocked.

branches: 1.61.2; 1.61.4;
"rump_private.h" -> <rump-sys/kern.h>

branches: 1.60.6;
Support for vnode operation versioning. Allow a new keyword "VERSION"
in the description so "VERSION 2" will change the name of the argument
from vop_XXX_args to vop_XXX_v2_args.

Additionally translate daddr_t to int64_t in the rumpvnode interface.
The type daddr_t is not available for all systems (e.g. Linux systems with
musl libc), and exposing it will just cause an unnecessary compilation
failure even if the type is not used.

branches: 1.58.2; 1.58.12; 1.58.16; 1.58.24;
Change VOP_BWRITE() to take a vnode as its first argument like all other
VOPs do. Layered file systems no longer have to modify bp->b_vp and run
into trouble when an async VOP_BWRITE() uses the wrong vnode.

Adresses PR kern/38762 panic: vwakeup: neg numoutput

No objections from tech-kern@.

- Use offsetof() in VOPARG_OFFSETOF() instead of re-implementing it.
- Remove VDESC_NOMAP_VPP and VDESC_VPP_WILLRELE.
- Remove VRELEL_NOINACTIVE and VRELEL_ONHEAD.

branches: 1.56.2;
Make rump vnode interface lightweight: the only things we
really need are:

0) provide VOP_OP in the alternate RUMP_VOP_OP namespace

and for each op:
1) schedule rump cpu
2) call VOP_OP
3) unschedule rump cpu

While here, take the opportunity to get rid of _t lossage in the
rump-exported interfaces.