Fixed bugs and finished staticization for things inside `#ifdef DEBUG'.
Moved most of these things inside `#ifdef notyet_block_reallocation_enabled'
where they may never be used again.

Changes to support 1Tb filesizes. Pages are now named by an
(object,index) pair instead of (object,offset) pair.

Untangled the vm.h include file spaghetti.

Yet another small block FS bug fix.

Fix more clustering bugs for FSes with block sizes < PAGE_SIZE.

Changed an incorrect splhigh to splbio.

General fixes to the vfs clustring code:

1) Make cluster buffer list be a non-malloced chain. This eliminates
yet another 'evil' M_WAITOK and generally cleans up the code.
2) Fix write clustering f

General fixes to the vfs clustring code:

1) Make cluster buffer list be a non-malloced chain. This eliminates
yet another 'evil' M_WAITOK and generally cleans up the code.
2) Fix write clustering for ext2fs. It was just broken. Also, ffs
clustering had an efficiency problem that more bawrites were happening
than should have been.
3) Make changes to buf.h to support the above, plus remove b_pfcent
at the request of David Greenman.
Reviewed by: davidg (partially)

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Change some of the debug sysctl vars. The semantics of these will change.

Second batch of cleanup changes.
This time mostly making a lot of things static and some unused
variables here and there.

Work-around a problem in the clustering code on non-VMIO buffers. The
write-side needs rewriting, but this makes a ktrace panic go away for
now.

These changes fix a bug in the clustering code that I made worse when adding
support for EXT2FS. Note that the Sig-11 problems appear to be caused by
this, but there is still probably an underlying

These changes fix a bug in the clustering code that I made worse when adding
support for EXT2FS. Note that the Sig-11 problems appear to be caused by
this, but there is still probably an underlying VM problem that let this
clustering bug cause vnode objects to appear to be corrupted.

The direct manifestation of this bug would have been severely mis-read
files. It is possible that processes would Sig-11 on very damaged
input files and might explain the mysterious differences in system
behaviour when phk's malloc is being used.

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Added VOP_GETPAGES/VOP_PUTPAGES and also the "backwards" block count
for VOP_BMAP. Updated affected filesystems...

VOP_BMAP will eventually need an additional argument, but not yet. This
backs out that modification to minimize the window during which this
is not yet correct.

Improvements to the cluster code, minor vfs_bio efficiency:
Better performance -- more aggressive read-ahead
under certain circumstanses.

Mods to support clustering on small
( < PAGE_SIZE) block

Improvements to the cluster code, minor vfs_bio efficiency:
Better performance -- more aggressive read-ahead
under certain circumstanses.

Mods to support clustering on small
( < PAGE_SIZE) block size filesystems (e.g. ext2fs,
msdosfs.)

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Don't include vm_pageout.h.

Remove trailing whitespace.

Check for case of blkno already known to avoid unnecessary VOP_BMAP's.

Submitted by: John Dyson

Fix from Doug Rabson: Don't try to release a pbuf we didn't get.
Minor style change by me.

Add and move declarations to fix all of the warnings from `gcc -Wimplicit'
(except in netccitt, netiso and netns) and most of the warnings from
`gcc -Wnested-externs'. Fix all the bugs found. There

Add and move declarations to fix all of the warnings from `gcc -Wimplicit'
(except in netccitt, netiso and netns) and most of the warnings from
`gcc -Wnested-externs'. Fix all the bugs found. There were no serious
ones.

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Removed obsolete vtrace() remnants.

Don't try to cluster busy buffers.

Submitted by: John Dyson

vfs_cluster.c:
Various more tweaks from John Dyson to improve read ahead calculations.

vfs_subr.c:
Only wakeup if numoutput is 0 in vwakeup().

Submitted by: John Dyson

Fixed a variety of deadlock and panic bugs, removed the bypass code, and
implemented the ability to limit bufferspace by memory consumed. (vfs_bio.c)
Fixed recently introduced bugs that caused extra

Fixed a variety of deadlock and panic bugs, removed the bypass code, and
implemented the ability to limit bufferspace by memory consumed. (vfs_bio.c)
Fixed recently introduced bugs that caused extra I/O to happen in some
cases. (vfs_cluster.c)

Submitted by: John Dyson

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These changes embody the support of the fully coherent merged VM buffer cache,
much higher filesystem I/O performance, and much better paging performance. It
represents the culmination of over 6 mont

These changes embody the support of the fully coherent merged VM buffer cache,
much higher filesystem I/O performance, and much better paging performance. It
represents the culmination of over 6 months of R&D.

The majority of the merged VM/cache work is by John Dyson.

The following highlights the most significant changes. Additionally, there are
(mostly minor) changes to the various filesystem modules (nfs, msdosfs, etc) to
support the new VM/buffer scheme.

vfs_bio.c:
Significant rewrite of most of vfs_bio to support the merged VM buffer cache
scheme. The scheme is almost fully compatible with the old filesystem
interface. Significant improvement in the number of opportunities for write
clustering.

vfs_cluster.c, vfs_subr.c
Upgrade and performance enhancements in vfs layer code to support merged
VM/buffer cache. Fixup of vfs_cluster to eliminate the bogus pagemove stuff.

vm_object.c:
Yet more improvements in the collapse code. Elimination of some windows that
can cause list corruption.

vm_pageout.c:
Fixed it, it really works better now. Somehow in 2.0, some "enhancements"
broke the code. This code has been reworked from the ground-up.

vm_fault.c, vm_page.c, pmap.c, vm_object.c
Support for small-block filesystems with merged VM/buffer cache scheme.

pmap.c vm_map.c
Dynamic kernel VM size, now we dont have to pre-allocate excessive numbers of
kernel PTs.

vm_glue.c
Much simpler and more effective swapping code. No more gratuitous swapping.

proc.h
Fixed the problem that the p_lock flag was not being cleared on a fork.

swap_pager.c, vnode_pager.c
Removal of old vfs_bio cruft to support the past pseudo-coherency. Now the
code doesn't need it anymore.

machdep.c
Changes to better support the parameter values for the merged VM/buffer cache
scheme.

machdep.c, kern_exec.c, vm_glue.c
Implemented a seperate submap for temporary exec string space and another one
to contain process upages. This eliminates all map fragmentation problems
that previously existed.

ffs_inode.c, ufs_inode.c, ufs_readwrite.c
Changes for merged VM/buffer cache. Add "bypass" support for sneaking in on
busy buffers.

Submitted by: John Dyson and David Greenman

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Fix possible off by one in b_save allocation size.