port/qio.c		1993/0526		Created.
		1993/0527
		1993/0528
		1993/0530
		1993/0601
		1993/0725
		1993/0727
		1993/0728
		1993/0804
		1993/0811
		1993/0819
		1993/0908
		1993/1102
		1993/1103
		1993/1227
		1994/0208
		1994/0215
		1994/0219
		1994/0222
		1994/0306
		1994/0309
		1994/0311
		1994/0312
		1994/0319
		1994/0320
		1994/0321
		1994/0322
		1994/0323
		1994/0324
		1994/0327
		1994/0328
		1994/0331
		1994/0418
		1994/0505
		1994/0507
		1994/0804
		1994/0902
		1994/0927
		1994/0929		Whitespace edit.
		1994/1026
		1994/1103
		1994/1116
		1994/1117
		1994/1124
		1995/0101
		1995/0104
		1995/0108
		1995/0125
		1995/0714
		1995/0902
		1995/0917
		1995/1121
		1995/1217
		1996/0305
		1996/0611
		1996/0731
		1996/1225
		1997/0327
		1997/0404
		1997/0410
		1997/0806
		1997/0925
		1997/0926
		1997/1007
		1997/1102
		1997/1104
		1997/1105
		1998/0328
		1998/0605		Debugging checks.
		1998/0703		Zero q->noblock after malloc (unnecessary in kernel).
		1998/0825		Bug fix: print format.
		1998/0918
		1998/0922
		1998/0923
		1998/0929
		1998/1127
		1998/1128		Bug fix: print format.
		1999/0115		Mail to presotto.
		1999/0219		Add enum for Maxatomic. Reduce to 32k.
		1999/0311		Check panic condition more aggressively.
		1999/0501		Bug fix: use getcallerpc correctly.
		1999/0522
		1999/0527
		1999/0603		Tag block with process name.
		1999/0714		Bug fix: called wrong function name.
		2000/0913		Change qbwrite to free block on error. Note bug: inconsistent with qwrite.
		2000/0914
		2001/0127
		2001/0128
		2001/0203
		2001/0207		Performance: explicitly reschedule if wake up a higher-priority process.
		2001/0306		Return number of bytes discarded in qdiscard.
		2001/0317
		2001/0504
		2001/0527		Convert to 9P2000.
		2001/0602		Make qremove, qputback global. Add pullupqueue, qadd.
		2001/0619		Add bl2mem, mem2bl. XXX more.
		2001/0624
		2001/0728
		2001/0804		Comment edit.
		2001/0805
		2001/0825		Pseudo-bug fix: qadd was leaking lists when passed more than one block.
		2001/0904		Add qiomaxatomic for 9P2000.
		2002/0114		Bug fix: print format.
		2002/0613		Increase Maxatomic.
		2002/0711
		2002/0712		Debugging print.
		2002/0713		Remove debugging print.
		2002/0714
		2002/1011
		2002/1012
		2002/1014
		2002/1015
		2002/1113
		2003/0220
		2003/0304