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venti: add -s flag to disable redundant SHA1 in mirrorarenas

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This commit is contained in:
Russ Cox 2007-08-23 11:01:20 -04:00
parent 2c0dfd420a
commit 92baf59b69
1 changed files with 29 additions and 17 deletions
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20
src/cmd/venti/srv/mirrorarenas.c
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@ -22,13 +22,14 @@ Part *src;
Part *dst;
int force;
int verbose;
int dosha1 = 1;
char *status;
uvlong astart, aend;
void
usage(void)
{
fprint(2, "usage: mirrorarenas [-v] src dst [ranges]\n");
fprint(2, "usage: mirrorarenas [-sv] src dst [ranges]\n");
threadexitsall("usage");
}
@ -240,7 +241,7 @@ void
mirror(Arena *sa, Arena *da)
{
vlong v, si, di, end;
int clumpmax, blocksize;
int clumpmax, blocksize, sealed;
static uchar buf[MaxIoSize];
ArenaHead h;
DigestState xds, *ds;
@ -305,7 +306,8 @@ mirror(Arena *sa, Arena *da)
shaoff = 0;
ds = nil;
if(sa->diskstats.sealed && scorecmp(sa->score, zeroscore) != 0){
sealed = sa->diskstats.sealed && scorecmp(sa->score, zeroscore) != 0;
if(sealed && dosha1){
/* start sha1 state with header */
memset(&xds, 0, sizeof xds);
ds = &xds;
@ -362,7 +364,7 @@ mirror(Arena *sa, Arena *da)
if(ewritepart(dst, end, buf, blocksize) < 0)
return;
if(ds){
if(sealed){
/*
* ... but on the final pass, copy the encoding
* of the tail information from the source
@ -375,6 +377,7 @@ mirror(Arena *sa, Arena *da)
if(asha1(dst, shaoff, end, ds) < 0
|| copy(end, end+blocksize-VtScoreSize, "tail", ds) < 0)
return;
if(dosha1){
memset(buf, 0, VtScoreSize);
sha1(buf, VtScoreSize, da->score, ds);
if(scorecmp(sa->score, da->score) == 0){
@ -390,6 +393,12 @@ mirror(Arena *sa, Arena *da)
chat("%T reseal: %V\n", da->score);
status = "errors";
}
}else{
if(verbose)
chat("%T %s: %V mirrored\n", sa->name, sa->score);
if(ewritepart(dst, end+blocksize-VtScoreSize, sa->score, VtScoreSize) < 0)
return;
}
}else{
chat("%T %s: %,lld used mirrored\n",
sa->name, sa->diskstats.used);
@ -462,6 +471,9 @@ threadmain(int argc, char **argv)
case 'v':
verbose++;
break;
case 's':
dosha1 = 0;
break;
default:
usage();
}ARGEND