return of venti

src/cmd/venti/srv/checkarenas.c

@@ -0,0 +1,135 @@
+#include "stdinc.h"
+#include "dat.h"
+#include "fns.h"
+
+static int	verbose;
+
+static void
+checkarena(Arena *arena, int scan, int fix)
+{
+	ATailStats old;
+	int err, e;
+
+	if(verbose && arena->memstats.clumps)
+		printarena(2, arena);
+
+	old = arena->memstats;
+
+	if(scan){
+		arena->memstats.used = 0;
+		arena->memstats.clumps = 0;
+		arena->memstats.cclumps = 0;
+		arena->memstats.uncsize = 0;
+	}
+
+	err = 0;
+	for(;;){
+		e = syncarena(arena, 0, 1000, 0, fix);
+		err |= e;
+		if(!(e & SyncHeader))
+			break;
+		if(verbose && arena->memstats.clumps)
+			fprint(2, ".");
+	}
+	if(verbose && arena->memstats.clumps)
+		fprint(2, "\n");
+
+	err &= ~SyncHeader;
+	if(arena->memstats.used != old.used
+	|| arena->memstats.clumps != old.clumps
+	|| arena->memstats.cclumps != old.cclumps
+	|| arena->memstats.uncsize != old.uncsize){
+		fprint(2, "%s: incorrect arena header fields\n", arena->name);
+		printarena(2, arena);
+		err |= SyncHeader;
+	}
+
+	if(!err || !fix)
+		return;
+
+	fprint(2, "%s: writing fixed arena header fields\n", arena->name);
+	arena->diskstats = arena->memstats;
+	if(wbarena(arena) < 0)
+		fprint(2, "arena header write failed: %r\n");
+	flushdcache();
+}
+
+void
+usage(void)
+{
+	fprint(2, "usage: checkarenas [-afv] file [arenaname...]\n");
+	threadexitsall(0);
+}
+
+int
+should(char *name, int argc, char **argv)
+{
+	int i;
+
+	if(argc == 0)
+		return 1;
+	for(i=0; i<argc; i++)
+		if(strcmp(name, argv[i]) == 0)
+			return 1;
+	return 0;
+}
+
+void
+threadmain(int argc, char *argv[])
+{
+	ArenaPart *ap;
+	Part *part;
+	char *file;
+	int i, fix, scan;
+
+	ventifmtinstall();
+	statsinit();
+
+	fix = 0;
+	scan = 0;
+	ARGBEGIN{
+	case 'f':
+		fix++;
+		break;
+	case 'a':
+		scan = 1;
+		break;
+	case 'v':
+		verbose++;
+		break;
+	default:
+		usage();
+		break;
+	}ARGEND
+
+	if(!fix)
+		readonly = 1;
+
+	if(argc < 1)
+		usage();
+
+	file = argv[0];
+
+	part = initpart(file, ORDWR|ODIRECT);
+	if(part == nil)
+		sysfatal("can't open partition %s: %r", file);
+
+	ap = initarenapart(part);
+	if(ap == nil)
+		sysfatal("can't initialize arena partition in %s: %r", file);
+
+	if(verbose > 1){
+		printarenapart(2, ap);
+		fprint(2, "\n");
+	}
+
+	initdcache(8 * MaxDiskBlock);
+
+	for(i = 0; i < ap->narenas; i++)
+		if(should(ap->arenas[i]->name, argc, argv))
+			checkarena(ap->arenas[i], scan, fix);
+
+	if(verbose > 1)
+		printstats();
+	threadexitsall(0);
+}