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venti: seal arenas without bypassing dcache

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This commit is contained in:
Russ Cox 2007-08-23 19:02:35 -04:00
parent 2432b7b1e5
commit db1cda12ae
1 changed files with 9 additions and 12 deletions
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21
src/cmd/venti/srv/arena.c
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@ -65,7 +65,7 @@ initarena(Part *part, u64int base, u64int size, u32int blocksize)
}
if(arena->diskstats.sealed && scorecmp(zeroscore, arena->score)==0)
backsumarena(arena);
sealarena(arena);
return arena;
}
@ -516,6 +516,7 @@ sumarena(Arena *arena)
/*
* read & sum all blocks except the last one
*/
flushdcache();
memset(&s, 0, sizeof s);
b = alloczblock(bs, 0, arena->part->blocksize);
e = arena->base + arena->size;
@ -551,24 +552,19 @@ ReadErr:
sha1(b->data, bs-VtScoreSize, nil, &s);
sha1(zeroscore, VtScoreSize, nil, &s);
sha1(nil, 0, score, &s);
/*
* check for no checksum or the same
*
* the writepart is okay because we flushed the dcache in sealarena
*/
if(scorecmp(score, &b->data[bs - VtScoreSize]) != 0){
if(scorecmp(zeroscore, &b->data[bs - VtScoreSize]) != 0)
logerr(EOk, "overwriting mismatched checksums for arena=%s, found=%V calculated=%V",
arena->name, &b->data[bs - VtScoreSize], score);
scorecp(&b->data[bs - VtScoreSize], score);
if(writepart(arena->part, e, b->data, bs) < 0)
logerr(EOk, "sumarena can't write sum for %s: %r", arena->name);
}
if(scorecmp(score, &b->data[bs - VtScoreSize]) != 0
&& scorecmp(zeroscore, &b->data[bs - VtScoreSize]) != 0)
logerr(EOk, "overwriting mismatched checksums for arena=%s, found=%V calculated=%V",
arena->name, &b->data[bs - VtScoreSize], score);
freezblock(b);
qlock(&arena->lock);
scorecp(arena->score, score);
wbarena(arena);
qunlock(&arena->lock);
}
@ -587,6 +583,7 @@ wbarena(Arena *arena)
}
dirtydblock(b, DirtyArenaTrailer);
bad = okarena(arena)<0 || packarena(arena, b->data)<0;
scorecp(b->data + arena->blocksize - VtScoreSize, arena->score);
putdblock(b);
if(bad)
return -1;