Fix build of tmpfs

The breakage was caused by the removal of #include <sys/systm.h>
from <uvm/uvm_map.h>.

OK deraadt@, mpi@, beck@

Introduce a dedicated entry point data structure for file locks. This new data
structure allows for better tracking of pending lock operations which is
essential in order to prevent a use-after-free

Introduce a dedicated entry point data structure for file locks. This new data
structure allows for better tracking of pending lock operations which is
essential in order to prevent a use-after-free once the underlying vnode is
gone.

Inspired by the lockf implementation in FreeBSD.

ok visa@

Reported-by: syzbot+d5540a236382f50f1dac@syzkaller.appspotmail.com

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Remove the lockmgr() API. It is only used by filesystems, where it is a
trivial change to use rrw locks instead. All it needs is LK_* defines
for the RW_* flags.

tested by naddy and sthen on package

Remove the lockmgr() API. It is only used by filesystems, where it is a
trivial change to use rrw locks instead. All it needs is LK_* defines
for the RW_* flags.

tested by naddy and sthen on package building infrastructure
input and ok jmc mpi tedu

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remove lock.h from uvm_extern.h. another holdover from the simpletonlock
era. fix uvm including c files to include lock.h or atomic.h as necessary.
ok deraadt

primary change: move uvm_vnode out of vnode, keeping only a pointer.
objective: vnode.h doesn't include uvm_extern.h anymore.
followup changes: include uvm_extern.h or lock.h where necessary.
ok and

primary change: move uvm_vnode out of vnode, keeping only a pointer.
objective: vnode.h doesn't include uvm_extern.h anymore.
followup changes: include uvm_extern.h or lock.h where necessary.
ok and help from deraadt

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bring in a few improvements from pedro, guenther, me...

thanks to krw@ for the original cherry-picking, millert@ for useful comment.

so:
- no longer expose internal kernel addresses, uses seq numbe

bring in a few improvements from pedro, guenther, me...

thanks to krw@ for the original cherry-picking, millert@ for useful comment.

so:
- no longer expose internal kernel addresses, uses seq numbers instead
- make sure the numbers don't overflow (millert@ UINT64_MAX)... a
conservative estimate is that tmpfs will run out of seqs in >600 years...
- don't malloc dents, put them on the stack and zero them
- gc whiteout code
- gc getpage/putpage code (shrink uvm instead)

okay krw@, millert@

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The readdir vop should set uio_offset to the cookie of the entry
after the last entry that fit, but I had it setting it to the cookier
of the entry after that, so it would skip one entry for each blo

The readdir vop should set uio_offset to the cookie of the entry
after the last entry that fit, but I had it setting it to the cookier
of the entry after that, so it would skip one entry for each block
required.

Remove the no-longer-needed cnt/cntp variable while we're touching things.

prodding and testing by espie@

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fix include guard locations (from pedro)

sprinkle $OpenBSD$, pointed out by pedro

import tmpfs code, originally from netbsd.
heavy lifting by Pedro Martelletto, timestamp fixes by me.

THIS IS NOT ENABLED YET, AND REQUIRES UVM CHANGES AND REVIEW.
Imported, so that working on it ca

import tmpfs code, originally from netbsd.
heavy lifting by Pedro Martelletto, timestamp fixes by me.

THIS IS NOT ENABLED YET, AND REQUIRES UVM CHANGES AND REVIEW.
Imported, so that working on it can be mostly done in tree with less painful
diff exchanges, and that we have history of further changes.

okay tedu@, deraadt@

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