commit e7e953b3dadb5aba3bb2f3f05b2beff94934a4dc
from: Russ Cox <rsc@swtch.com>
date: Sun Apr 22 19:27:06 2012 UTC

venti: add bootstrap mode (write + no index)

R=rsc, rsc
http://codereview.appspot.com/6097047

commit - a2df31f46d2119bf79d5b0e0fba07cef4564abcc
commit + e7e953b3dadb5aba3bb2f3f05b2beff94934a4dc
blob - 3d8e78412c7347e9f40a980c763cae08e9158a75
blob + f47d01a12f60382bd877ba126295f7a2496cc021
--- src/cmd/venti/srv/dat.h
+++ src/cmd/venti/srv/dat.h
@@ -740,6 +740,7 @@ extern	Stats		stats;
 extern	u8int		zeroscore[VtScoreSize];
 extern	int		compressblocks;
 extern	int		writestodevnull;	/* dangerous - for performance debugging */
+extern	int		bootstrap;		/* writes but does not index - cannot read */
 extern	int		collectstats;
 extern	QLock	memdrawlock;
 extern	int		icachesleeptime;
blob - 5a3f3c6fa36aae3db6d83252e4dfbd3182903032
blob + 83d80ca77868ea89ceb80135161a662c36aab1e8
--- src/cmd/venti/srv/httpd.c
+++ src/cmd/venti/srv/httpd.c
@@ -396,6 +396,7 @@ static struct
 	"ignorebloom",	&ignorebloom,
 	"syncwrites",	&syncwrites,
 	"icacheprefetch",	&icacheprefetch,
+	"bootstrap",	&bootstrap,
 	0
 };
 
blob - af76819f92e5d96fcbc027bc4b65bcd2badf3b11
blob + 3055b981d586ceb8cbb30e8cff8ae480da9473fc
--- src/cmd/venti/srv/icache.c
+++ src/cmd/venti/srv/icache.c
@@ -386,6 +386,9 @@ int
 icachelookup(u8int score[VtScoreSize], int type, IAddr *ia)
 {
 	IEntry *ie;
+
+	if(bootstrap)
+		return -1;
 
 	qlock(&icache.lock);
 	addstat(StatIcacheLookup, 1);
@@ -417,6 +420,9 @@ insertscore(u8int score[VtScoreSize], IAddr *ia, int s
 {
 	ISum *toload;
 
+	if(bootstrap)
+		return -1;
+
 	qlock(&icache.lock);
 	icacheinsert(score, ia, state);
 	if(state == IEClean)
blob - 9b244948b118351d6ce3e686b710de25fa5bc1c6
blob + cc0a26dc6fe290ae59604f07ea65d19b98f8d53a
--- src/cmd/venti/srv/lump.c
+++ src/cmd/venti/srv/lump.c
@@ -2,6 +2,7 @@
 #include "dat.h"
 #include "fns.h"
 
+int			bootstrap = 0;
 int			syncwrites = 0;
 int			queuewrites = 0;
 int			writestodevnull = 0;