ref: fed50d79d38881437639f3189b4a99aee93daa9a
dir: /sys/src/cmd/venti/srv/conv.c/
#include "stdinc.h"
#include "dat.h"
#include "fns.h"
/*
* disk structure conversion routines
*/
#define U8GET(p) ((p)[0])
#define U16GET(p) (((p)[0]<<8)|(p)[1])
#define U32GET(p) ((u32int)(((p)[0]<<24)|((p)[1]<<16)|((p)[2]<<8)|(p)[3]))
#define U64GET(p) (((u64int)U32GET(p)<<32)|(u64int)U32GET((p)+4))
#define U8PUT(p,v) (p)[0]=(v)&0xFF
#define U16PUT(p,v) (p)[0]=((v)>>8)&0xFF;(p)[1]=(v)&0xFF
#define U32PUT(p,v) (p)[0]=((v)>>24)&0xFF;(p)[1]=((v)>>16)&0xFF;(p)[2]=((v)>>8)&0xFF;(p)[3]=(v)&0xFF
#define U64PUT(p,v,t32) t32=(v)>>32;U32PUT(p,t32);t32=(v);U32PUT((p)+4,t32)
int debugarena = -1; /* hack to improve error reporting */
static struct {
u32int m;
char *s;
} magics[] = {
ArenaPartMagic, "ArenaPartMagic",
ArenaHeadMagic, "ArenaHeadMagic",
ArenaMagic, "ArenaMagic",
ISectMagic, "ISectMagic",
BloomMagic, "BloomMagic",
};
static char*
fmtmagic(char *s, u32int m)
{
int i;
for(i=0; i<nelem(magics); i++)
if(magics[i].m == m)
return magics[i].s;
sprint(s, "%#08ux", m);
return s;
}
u32int
unpackmagic(u8int *buf)
{
return U32GET(buf);
}
void
packmagic(u32int magic, u8int *buf)
{
U32PUT(buf, magic);
}
int
unpackarenapart(ArenaPart *ap, u8int *buf)
{
u8int *p;
u32int m;
char fbuf[20];
p = buf;
m = U32GET(p);
if(m != ArenaPartMagic){
seterr(ECorrupt, "arena set has wrong magic number: %s expected ArenaPartMagic (%#lux)", fmtmagic(fbuf, m), ArenaPartMagic);
return -1;
}
p += U32Size;
ap->version = U32GET(p);
p += U32Size;
ap->blocksize = U32GET(p);
p += U32Size;
ap->arenabase = U32GET(p);
p += U32Size;
if(buf + ArenaPartSize != p)
sysfatal("unpackarenapart unpacked wrong amount");
return 0;
}
int
packarenapart(ArenaPart *ap, u8int *buf)
{
u8int *p;
p = buf;
U32PUT(p, ArenaPartMagic);
p += U32Size;
U32PUT(p, ap->version);
p += U32Size;
U32PUT(p, ap->blocksize);
p += U32Size;
U32PUT(p, ap->arenabase);
p += U32Size;
if(buf + ArenaPartSize != p)
sysfatal("packarenapart packed wrong amount");
return 0;
}
int
unpackarena(Arena *arena, u8int *buf)
{
int sz;
u8int *p;
u32int m;
char fbuf[20];
p = buf;
m = U32GET(p);
if(m != ArenaMagic){
seterr(ECorrupt, "arena %d has wrong magic number: %s "
"expected ArenaMagic (%#lux)", debugarena,
fmtmagic(fbuf, m), ArenaMagic);
return -1;
}
p += U32Size;
arena->version = U32GET(p);
p += U32Size;
namecp(arena->name, (char*)p);
p += ANameSize;
arena->diskstats.clumps = U32GET(p);
p += U32Size;
arena->diskstats.cclumps = U32GET(p);
p += U32Size;
arena->ctime = U32GET(p);
p += U32Size;
arena->wtime = U32GET(p);
p += U32Size;
if(arena->version == ArenaVersion5){
arena->clumpmagic = U32GET(p);
p += U32Size;
}
arena->diskstats.used = U64GET(p);
p += U64Size;
arena->diskstats.uncsize = U64GET(p);
p += U64Size;
arena->diskstats.sealed = U8GET(p);
p += U8Size;
switch(arena->version){
case ArenaVersion4:
sz = ArenaSize4;
arena->clumpmagic = _ClumpMagic;
break;
case ArenaVersion5:
sz = ArenaSize5;
break;
default:
seterr(ECorrupt, "arena has bad version number %d", arena->version);
return -1;
}
/*
* Additional fields for the memstats version of the stats.
* Diskstats reflects what is committed to the index.
* Memstats reflects what is in the arena. Originally intended
* this to be a version 5 extension, but might as well use for
* all the existing version 4 arenas too.
*
* To maintain backwards compatibility with existing venti
* installations using the older format, we define that if
* memstats == diskstats, then the extension fields are not
* included (see packarena below). That is, only partially
* indexed arenas have these fields. Fully indexed arenas
* (in particular, sealed arenas) do not.
*/
if(U8GET(p) == 1){
sz += ArenaSize5a-ArenaSize5;
p += U8Size;
arena->memstats.clumps = U32GET(p);
p += U32Size;
arena->memstats.cclumps = U32GET(p);
p += U32Size;
arena->memstats.used = U64GET(p);
p += U64Size;
arena->memstats.uncsize = U64GET(p);
p += U64Size;
arena->memstats.sealed = U8GET(p);
p += U8Size;
/*
* 2008/4/2
* Packarena (below) used to have a bug in which it would
* not zero out any existing extension fields when writing
* the arena metadata. This would manifest itself as arenas
* with arena->diskstats.sealed == 1 but arena->memstats.sealed == 0
* after a server restart. Because arena->memstats.sealed wouldn't
* be set, the server might try to fit another block into the arena
* (and succeed), violating the append-only structure of the log
* and invalidating any already-computed seal on the arena.
*
* It might end up that other fields in arena->memstats end up
* behind arena->diskstats too, but that would be considerably
* more rare, and the bug is fixed now. The case we need to
* handle is just the sealed mismatch.
*
* If we encounter such a bogus arena, fix the sealed field.
*/
if(arena->diskstats.sealed)
arena->memstats.sealed = 1;
}else
arena->memstats = arena->diskstats;
if(buf + sz != p)
sysfatal("unpackarena unpacked wrong amount");
return 0;
}
int
packarena(Arena *arena, u8int *buf)
{
return _packarena(arena, buf, 0);
}
int
_packarena(Arena *arena, u8int *buf, int forceext)
{
int sz;
u8int *p;
u32int t32;
switch(arena->version){
case ArenaVersion4:
sz = ArenaSize4;
if(arena->clumpmagic != _ClumpMagic)
fprint(2, "warning: writing old arena tail loses clump magic 0x%lux != 0x%lux\n",
(ulong)arena->clumpmagic, (ulong)_ClumpMagic);
break;
case ArenaVersion5:
sz = ArenaSize5;
break;
default:
sysfatal("packarena unknown version %d", arena->version);
return -1;
}
p = buf;
U32PUT(p, ArenaMagic);
p += U32Size;
U32PUT(p, arena->version);
p += U32Size;
namecp((char*)p, arena->name);
p += ANameSize;
U32PUT(p, arena->diskstats.clumps);
p += U32Size;
U32PUT(p, arena->diskstats.cclumps);
p += U32Size;
U32PUT(p, arena->ctime);
p += U32Size;
U32PUT(p, arena->wtime);
p += U32Size;
if(arena->version == ArenaVersion5){
U32PUT(p, arena->clumpmagic);
p += U32Size;
}
U64PUT(p, arena->diskstats.used, t32);
p += U64Size;
U64PUT(p, arena->diskstats.uncsize, t32);
p += U64Size;
U8PUT(p, arena->diskstats.sealed);
p += U8Size;
/*
* Extension fields; see above.
*/
if(forceext
|| arena->memstats.clumps != arena->diskstats.clumps
|| arena->memstats.cclumps != arena->diskstats.cclumps
|| arena->memstats.used != arena->diskstats.used
|| arena->memstats.uncsize != arena->diskstats.uncsize
|| arena->memstats.sealed != arena->diskstats.sealed){
sz += ArenaSize5a - ArenaSize5;
U8PUT(p, 1);
p += U8Size;
U32PUT(p, arena->memstats.clumps);
p += U32Size;
U32PUT(p, arena->memstats.cclumps);
p += U32Size;
U64PUT(p, arena->memstats.used, t32);
p += U64Size;
U64PUT(p, arena->memstats.uncsize, t32);
p += U64Size;
U8PUT(p, arena->memstats.sealed);
p += U8Size;
}else{
/* Clear any extension fields already on disk. */
memset(p, 0, ArenaSize5a - ArenaSize5);
p += ArenaSize5a - ArenaSize5;
sz += ArenaSize5a - ArenaSize5;
}
if(buf + sz != p)
sysfatal("packarena packed wrong amount");
return 0;
}
int
unpackarenahead(ArenaHead *head, u8int *buf)
{
u8int *p;
u32int m;
int sz;
char fbuf[20];
p = buf;
m = U32GET(p);
if(m != ArenaHeadMagic){
seterr(ECorrupt, "arena %d head has wrong magic number: %s "
"expected ArenaHeadMagic (%#lux)", debugarena,
fmtmagic(fbuf, m), ArenaHeadMagic);
return -1;
}
p += U32Size;
head->version = U32GET(p);
p += U32Size;
namecp(head->name, (char*)p);
p += ANameSize;
head->blocksize = U32GET(p);
p += U32Size;
head->size = U64GET(p);
p += U64Size;
if(head->version == ArenaVersion5){
head->clumpmagic = U32GET(p);
p += U32Size;
}
switch(head->version){
case ArenaVersion4:
sz = ArenaHeadSize4;
head->clumpmagic = _ClumpMagic;
break;
case ArenaVersion5:
sz = ArenaHeadSize5;
break;
default:
seterr(ECorrupt, "arena head has unexpected version %d", head->version);
return -1;
}
if(buf + sz != p)
sysfatal("unpackarenahead unpacked wrong amount");
return 0;
}
int
packarenahead(ArenaHead *head, u8int *buf)
{
u8int *p;
int sz;
u32int t32;
switch(head->version){
case ArenaVersion4:
sz = ArenaHeadSize4;
if(head->clumpmagic != _ClumpMagic)
fprint(2, "warning: writing old arena header loses clump magic 0x%lux != 0x%lux\n",
(ulong)head->clumpmagic, (ulong)_ClumpMagic);
break;
case ArenaVersion5:
sz = ArenaHeadSize5;
break;
default:
sysfatal("packarenahead unknown version %d", head->version);
return -1;
}
p = buf;
U32PUT(p, ArenaHeadMagic);
p += U32Size;
U32PUT(p, head->version);
p += U32Size;
namecp((char*)p, head->name);
p += ANameSize;
U32PUT(p, head->blocksize);
p += U32Size;
U64PUT(p, head->size, t32);
p += U64Size;
if(head->version == ArenaVersion5){
U32PUT(p, head->clumpmagic);
p += U32Size;
}
if(buf + sz != p)
sysfatal("packarenahead packed wrong amount");
return 0;
}
static int
checkclump(Clump *w)
{
if(w->encoding == ClumpENone){
if(w->info.size != w->info.uncsize){
seterr(ECorrupt, "uncompressed wad size mismatch");
return -1;
}
}else if(w->encoding == ClumpECompress){
if(w->info.size >= w->info.uncsize){
seterr(ECorrupt, "compressed lump has inconsistent block sizes %d %d", w->info.size, w->info.uncsize);
return -1;
}
}else{
seterr(ECorrupt, "clump has illegal encoding");
return -1;
}
return 0;
}
int
unpackclump(Clump *c, u8int *buf, u32int cmagic)
{
u8int *p;
u32int magic;
p = buf;
magic = U32GET(p);
if(magic != cmagic){
seterr(ECorrupt, "clump has bad magic number=%#8.8ux != %#8.8ux", magic, cmagic);
return -1;
}
p += U32Size;
c->info.type = vtfromdisktype(U8GET(p));
p += U8Size;
c->info.size = U16GET(p);
p += U16Size;
c->info.uncsize = U16GET(p);
p += U16Size;
scorecp(c->info.score, p);
p += VtScoreSize;
c->encoding = U8GET(p);
p += U8Size;
c->creator = U32GET(p);
p += U32Size;
c->time = U32GET(p);
p += U32Size;
if(buf + ClumpSize != p)
sysfatal("unpackclump unpacked wrong amount");
return checkclump(c);
}
int
packclump(Clump *c, u8int *buf, u32int magic)
{
u8int *p;
p = buf;
U32PUT(p, magic);
p += U32Size;
U8PUT(p, vttodisktype(c->info.type));
p += U8Size;
U16PUT(p, c->info.size);
p += U16Size;
U16PUT(p, c->info.uncsize);
p += U16Size;
scorecp(p, c->info.score);
p += VtScoreSize;
U8PUT(p, c->encoding);
p += U8Size;
U32PUT(p, c->creator);
p += U32Size;
U32PUT(p, c->time);
p += U32Size;
if(buf + ClumpSize != p)
sysfatal("packclump packed wrong amount");
return checkclump(c);
}
void
unpackclumpinfo(ClumpInfo *ci, u8int *buf)
{
u8int *p;
p = buf;
ci->type = vtfromdisktype(U8GET(p));
p += U8Size;
ci->size = U16GET(p);
p += U16Size;
ci->uncsize = U16GET(p);
p += U16Size;
scorecp(ci->score, p);
p += VtScoreSize;
if(buf + ClumpInfoSize != p)
sysfatal("unpackclumpinfo unpacked wrong amount");
}
void
packclumpinfo(ClumpInfo *ci, u8int *buf)
{
u8int *p;
p = buf;
U8PUT(p, vttodisktype(ci->type));
p += U8Size;
U16PUT(p, ci->size);
p += U16Size;
U16PUT(p, ci->uncsize);
p += U16Size;
scorecp(p, ci->score);
p += VtScoreSize;
if(buf + ClumpInfoSize != p)
sysfatal("packclumpinfo packed wrong amount");
}
int
unpackisect(ISect *is, u8int *buf)
{
u8int *p;
u32int m;
char fbuf[20];
p = buf;
m = U32GET(p);
if(m != ISectMagic){
seterr(ECorrupt, "index section has wrong magic number: %s expected ISectMagic (%#lux)",
fmtmagic(fbuf, m), ISectMagic);
return -1;
}
p += U32Size;
is->version = U32GET(p);
p += U32Size;
namecp(is->name, (char*)p);
p += ANameSize;
namecp(is->index, (char*)p);
p += ANameSize;
is->blocksize = U32GET(p);
p += U32Size;
is->blockbase = U32GET(p);
p += U32Size;
is->blocks = U32GET(p);
p += U32Size;
is->start = U32GET(p);
p += U32Size;
is->stop = U32GET(p);
p += U32Size;
if(buf + ISectSize1 != p)
sysfatal("unpackisect unpacked wrong amount");
is->bucketmagic = 0;
if(is->version == ISectVersion2){
is->bucketmagic = U32GET(p);
p += U32Size;
if(buf + ISectSize2 != p)
sysfatal("unpackisect unpacked wrong amount");
}
return 0;
}
int
packisect(ISect *is, u8int *buf)
{
u8int *p;
p = buf;
U32PUT(p, ISectMagic);
p += U32Size;
U32PUT(p, is->version);
p += U32Size;
namecp((char*)p, is->name);
p += ANameSize;
namecp((char*)p, is->index);
p += ANameSize;
U32PUT(p, is->blocksize);
p += U32Size;
U32PUT(p, is->blockbase);
p += U32Size;
U32PUT(p, is->blocks);
p += U32Size;
U32PUT(p, is->start);
p += U32Size;
U32PUT(p, is->stop);
p += U32Size;
if(buf + ISectSize1 != p)
sysfatal("packisect packed wrong amount");
if(is->version == ISectVersion2){
U32PUT(p, is->bucketmagic);
p += U32Size;
if(buf + ISectSize2 != p)
sysfatal("packisect packed wrong amount");
}
return 0;
}
void
unpackientry(IEntry *ie, u8int *buf)
{
u8int *p;
p = buf;
scorecp(ie->score, p);
p += VtScoreSize;
/* ie->wtime = U32GET(p); */
p += U32Size;
/* ie->train = U16GET(p); */
p += U16Size;
if(p - buf != IEntryAddrOff)
sysfatal("unpackentry bad IEntryAddrOff amount");
ie->ia.addr = U64GET(p);
if(ie->ia.addr>>56) print("%.8H => %llux\n", p, ie->ia.addr);
p += U64Size;
ie->ia.size = U16GET(p);
p += U16Size;
if(p - buf != IEntryTypeOff)
sysfatal("unpackientry bad IEntryTypeOff amount");
ie->ia.type = vtfromdisktype(U8GET(p));
p += U8Size;
ie->ia.blocks = U8GET(p);
p += U8Size;
if(p - buf != IEntrySize)
sysfatal("unpackientry unpacked wrong amount");
}
void
packientry(IEntry *ie, u8int *buf)
{
u32int t32;
u8int *p;
p = buf;
scorecp(p, ie->score);
p += VtScoreSize;
U32PUT(p, 0); /* wtime */
p += U32Size;
U16PUT(p, 0); /* train */
p += U16Size;
U64PUT(p, ie->ia.addr, t32);
p += U64Size;
U16PUT(p, ie->ia.size);
p += U16Size;
U8PUT(p, vttodisktype(ie->ia.type));
p += U8Size;
U8PUT(p, ie->ia.blocks);
p += U8Size;
if(p - buf != IEntrySize)
sysfatal("packientry packed wrong amount");
}
void
unpackibucket(IBucket *b, u8int *buf, u32int magic)
{
b->n = U16GET(buf);
b->data = buf + IBucketSize;
if(magic && magic != U32GET(buf+U16Size))
b->n = 0;
}
void
packibucket(IBucket *b, u8int *buf, u32int magic)
{
U16PUT(buf, b->n);
U32PUT(buf+U16Size, magic);
}
void
packbloomhead(Bloom *b, u8int *buf)
{
u8int *p;
p = buf;
U32PUT(p, BloomMagic);
U32PUT(p+4, BloomVersion);
U32PUT(p+8, b->nhash);
U32PUT(p+12, b->size);
}
int
unpackbloomhead(Bloom *b, u8int *buf)
{
u8int *p;
u32int m;
char fbuf[20];
p = buf;
m = U32GET(p);
if(m != BloomMagic){
seterr(ECorrupt, "bloom filter has wrong magic number: %s expected BloomMagic (%#lux)", fmtmagic(fbuf, m), (ulong)BloomMagic);
return -1;
}
p += U32Size;
m = U32GET(p);
if(m != BloomVersion){
seterr(ECorrupt, "bloom filter has wrong version %ud expected %ud", (uint)m, (uint)BloomVersion);
return -1;
}
p += U32Size;
b->nhash = U32GET(p);
p += U32Size;
b->size = U32GET(p);
p += U32Size;
if(b->size < BloomHeadSize || b->size > MaxBloomSize || (b->size&(b->size-1))){
seterr(ECorrupt, "bloom filter has invalid size %#lux", b->size);
return -1;
}
if(buf + BloomHeadSize != p)
sysfatal("unpackarena unpacked wrong amount");
return 0;
}