Initial stab at Venti.

1 files changed, 188 insertions, 0 deletions

diff --git a/src/cmd/venti/checkindex.c b/src/cmd/venti/checkindex.c
new file mode 100644
index 00000000..fa6f5efc
--- /dev/null
+++ b/src/cmd/venti/checkindex.c
@@ -0,0 +1,188 @@
+#include "stdinc.h"
+#include "dat.h"
+#include "fns.h"
+
+static int
+checkbucket(Index *ix, u32int buck, IBucket *ib)
+{
+	ISect *is;
+	DBlock *eb;
+	IBucket eib;
+	IEntry ie, eie;
+	int i, ei, ok, c;
+
+	is = findisect(ix, buck);
+	if(is == nil){
+		seterr(EAdmin, "bad math in checkbuckets");
+		return -1;
+	}
+	buck -= is->start;
+	eb = getdblock(is->part, is->blockbase + ((u64int)buck << is->blocklog), 1);
+	if(eb == nil)
+		return -1;
+	unpackibucket(&eib, eb->data);
+
+	ok = 0;
+	ei = 0;
+	for(i = 0; i < ib->n; i++){
+		while(ei < eib.n){
+			c = ientrycmp(&ib->data[i * IEntrySize], &eib.data[ei * IEntrySize]);
+			if(c == 0){
+				unpackientry(&ie, &ib->data[i * IEntrySize]);
+				unpackientry(&eie, &eib.data[ei * IEntrySize]);
+				if(iaddrcmp(&ie.ia, &eie.ia) != 0){
+					fprint(2, "bad entry in index for score=%V\n", &ib->data[i * IEntrySize]);
+					fprint(2, "\taddr=%lld type=%d size=%d blocks=%d\n",
+						ie.ia.addr, ie.ia.type, ie.ia.size, ie.ia.blocks);
+					fprint(2, "\taddr=%lld type=%d size=%d blocks=%d\n",
+						eie.ia.addr, eie.ia.type, eie.ia.size, eie.ia.blocks);
+				}
+				ei++;
+				goto cont;
+			}
+			if(c < 0)
+				break;
+if(1)
+			fprint(2, "spurious entry in index for score=%V type=%d\n",
+				&eib.data[ei * IEntrySize], eib.data[ei * IEntrySize + IEntryTypeOff]);
+			ei++;
+			ok = -1;
+		}
+		fprint(2, "missing entry in index for score=%V type=%d\n",
+			&ib->data[i * IEntrySize], ib->data[i * IEntrySize + IEntryTypeOff]);
+		ok = -1;
+	cont:;
+	}
+	for(; ei < eib.n; ei++){
+if(1)		fprint(2, "spurious entry in index for score=%V; found %d entries expected %d\n",
+			&eib.data[ei * IEntrySize], eib.n, ib->n);
+		ok = -1;
+		break;
+	}
+	putdblock(eb);
+	return ok;
+}
+
+int
+checkindex(Index *ix, Part *part, u64int off, u64int clumps, int zero)
+{
+	IEStream *ies;
+	IBucket ib, zib;
+	ZBlock *z, *b;
+	u32int next, buck;
+	int ok, bok;
+u64int found = 0;
+
+//ZZZ make buffer size configurable
+	b = alloczblock(ix->blocksize, 0);
+	z = alloczblock(ix->blocksize, 1);
+	ies = initiestream(part, off, clumps, 64*1024);
+	if(b == nil || z == nil || ies == nil){
+		ok = -1;
+		goto breakout;
+		return -1;
+	}
+	ok = 0;
+	next = 0;
+	ib.data = b->data;
+	zib.data = z->data;
+	zib.n = 0;
+	zib.next = 0;
+	for(;;){
+		buck = buildbucket(ix, ies, &ib);
+		found += ib.n;
+		if(zero){
+			for(; next != buck; next++){
+				if(next == ix->buckets){
+					if(buck != TWID32)
+						fprint(2, "bucket out of range\n");
+					goto breakout;
+				}
+				bok = checkbucket(ix, next, &zib);
+				if(bok < 0){
+					fprint(2, "bad bucket=%d found: %r\n", next);
+					ok = -1;
+				}
+			}
+		}
+		if(buck >= ix->buckets){
+			if(buck == TWID32)
+				break;
+			fprint(2, "bucket out of range\n");
+			ok = -1;
+			goto breakout;
+		}
+		bok = checkbucket(ix, buck, &ib);
+		if(bok < 0){
+			fprint(2, "bad bucket found=%lld: %r\n", found);
+			ok = -1;
+		}
+		next = buck + 1;
+	}
+breakout:;
+fprint(2, "found %lld entries in sorted list\n", found);
+	freeiestream(ies);
+	freezblock(z);
+	freezblock(b);
+	return ok;
+}
+
+void
+usage(void)
+{
+	fprint(2, "usage: checkindex [-f] [-B blockcachesize] config tmp\n");
+	threadexitsall(0);
+}
+
+void
+threadmain(int argc, char *argv[])
+{
+	Part *part;
+	u64int clumps, base;
+	u32int bcmem;
+	int fix, skipz;
+
+	fix = 0;
+	bcmem = 0;
+	skipz = 0;
+	ARGBEGIN{
+	case 'B':
+		bcmem = unittoull(ARGF());
+		break;
+	case 'f':
+		fix++;
+		break;
+	case 'Z':
+		skipz = 1;
+		break;
+	default:
+		usage();
+		break;
+	}ARGEND
+
+	if(!fix)
+		readonly = 1;
+
+	if(argc != 2)
+		usage();
+
+	if(initventi(argv[0]) < 0)
+		sysfatal("can't init venti: %r");
+
+	if(bcmem < maxblocksize * (mainindex->narenas + mainindex->nsects * 4 + 16))
+		bcmem = maxblocksize * (mainindex->narenas + mainindex->nsects * 4 + 16);
+	fprint(2, "initialize %d bytes of disk block cache\n", bcmem);
+	initdcache(bcmem);
+
+	part = initpart(argv[1], 1);
+	if(part == nil)
+		sysfatal("can't initialize temporary partition: %r");
+
+	clumps = sortrawientries(mainindex, part, &base);
+	if(clumps == TWID64)
+		sysfatal("can't build sorted index: %r");
+	fprint(2, "found and sorted index entries for clumps=%lld at %lld\n", clumps, base);
+	checkindex(mainindex, part, base, clumps, !skipz);
+	
+	threadexitsall(0);
+}