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use clump info directory to walk past corruption

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This commit is contained in:
rsc 2007-05-03 03:14:59 +00:00
parent 0e26338762
commit 703c2d41ac
1 changed files with 26 additions and 18 deletions
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40
src/cmd/venti/srv/wrarena.c
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@ -11,6 +11,7 @@ VtConn *z;
int fast; /* and a bit unsafe; only for benchmarking */
int haveaoffset;
int maxwrites = -1;
int verbose;
typedef struct ZClump ZClump;
struct ZClump
@ -38,6 +39,8 @@ vtsendthread(void *v)
break;
if(vtwrite(z, zcl.cl.info.score, zcl.cl.info.type, zcl.lump->data, zcl.cl.info.uncsize) < 0)
sysfatal("failed writing clump %llud: %r", zcl.aa);
if(verbose)
print("%V\n", zcl.cl.info.score);
freezblock(zcl.lump);
}
/*
@ -57,9 +60,10 @@ vtsendthread(void *v)
static void
rdarena(Arena *arena, u64int offset)
{
int i;
u64int a, aa, e;
u32int magic;
Clump cl;
ClumpInfo ci;
uchar score[VtScoreSize];
ZBlock *lump;
ZClump zcl;
@ -71,50 +75,51 @@ rdarena(Arena *arena, u64int offset)
e = arena->base + arena->size;
if(offset != ~(u64int)0) {
if(offset >= e-a)
sysfatal("bad offset %llud >= %llud\n",
sysfatal("bad offset %#llx >= %#llx\n",
offset, e-a);
aa = offset;
} else
aa = 0;
if(maxwrites != 0)
for(; aa < e; aa += ClumpSize+cl.info.size) {
magic = clumpmagic(arena, aa);
if(magic == ClumpFreeMagic)
break;
if(magic != arena->clumpmagic) {
if(0) fprint(2, "illegal clump magic number %#8.8ux offset %llud\n",
magic, aa);
for(i=0, a=0; i<arena->memstats.clumps; i++, a+=ClumpSize+ci.size) {
if(readclumpinfo(arena, i, &ci) < 0)
break;
if(a < aa || ci.type == VtCorruptType){
if(ci.type == VtCorruptType)
fprint(2, "corrupt at %#llx: +%d\n", a, ClumpSize+ci.size);
continue;
}
lump = loadclump(arena, aa, 0, &cl, score, 0);
lump = loadclump(arena, a, 0, &cl, score, 0);
if(lump == nil) {
fprint(2, "clump %llud failed to read: %r\n", aa);
break;
fprint(2, "clump %#llx failed to read: %r\n", a);
continue;
}
if(!fast && cl.info.type != VtCorruptType) {
scoremem(score, lump->data, cl.info.uncsize);
if(scorecmp(cl.info.score, score) != 0) {
fprint(2, "clump %llud has mismatched score\n", aa);
fprint(2, "clump %#llx has mismatched score\n", a);
break;
}
if(vttypevalid(cl.info.type) < 0) {
fprint(2, "clump %llud has bad type %d\n", aa, cl.info.type);
fprint(2, "clump %#llx has bad type %d\n", a, cl.info.type);
break;
}
}
if(z && cl.info.type != VtCorruptType){
zcl.cl = cl;
zcl.lump = lump;
zcl.aa = aa;
zcl.aa = a;
send(c, &zcl);
}else
freezblock(lump);
if(maxwrites>0 && --maxwrites == 0)
break;
}
if(a > aa)
aa = a;
if(haveaoffset)
print("end offset %llud\n", aa);
print("end offset %#llx\n", aa);
}
void
@ -147,6 +152,9 @@ threadmain(int argc, char *argv[])
case 'M':
maxwrites = atoi(EARGF(usage()));
break;
case 'v':
verbose = 1;
break;
default:
usage();
break;