ref: 5c448c618a89ab8933838da1b5b97ed7c4a42e08
dir: /sys/src/cmd/venti/srv/cmparenas.c/
#include "stdinc.h"
#include "dat.h"
#include "fns.h"
static int verbose;
static int fd;
static int fd1;
static uchar *data;
static uchar *data1;
static int blocksize;
static int sleepms;
void
usage(void)
{
fprint(2, "usage: cmparenas [-b blocksize] [-s ms] [-v] arenapart1 arenapart2 [name...]]\n");
threadexitsall(0);
}
static int
preadblock(int fd, uchar *buf, int n, vlong off)
{
int nr, m;
for(nr = 0; nr < n; nr += m){
m = n - nr;
m = pread(fd, &buf[nr], m, off+nr);
if(m <= 0){
if(m == 0)
werrstr("early eof");
return -1;
}
}
return 0;
}
static int
readblock(int fd, uchar *buf, int n)
{
int nr, m;
for(nr = 0; nr < n; nr += m){
m = n - nr;
m = read(fd, &buf[nr], m);
if(m <= 0){
if(m == 0)
werrstr("early eof");
return -1;
}
}
return 0;
}
static int
printheader(char *name, ArenaHead *head, int fd)
{
Arena arena;
vlong baseoff, lo, hi, off;
int clumpmax;
off = seek(fd, 0, 1);
seek(fd, off + head->size - head->blocksize, 0);
if(readblock(fd, data, head->blocksize) < 0){
fprint(2, "%s: reading arena tail: %r\n", name);
return -1;
}
seek(fd, off, 0);
memset(&arena, 0, sizeof arena);
if(unpackarena(&arena, data) < 0){
fprint(2, "%s: unpack arena tail: %r\n", name);
return -1;
}
arena.blocksize = head->blocksize;
arena.base = off + head->blocksize;
arena.clumpmax = arena.blocksize / ClumpInfoSize;
arena.size = head->size - 2*head->blocksize;
fprint(2, "%s: base=%llx size=%llx blocksize=%x\n", name, off, head->size, head->blocksize);
baseoff = head->blocksize;
fprint(2, "\t%llx-%llx: head\n", (vlong)0, baseoff);
lo = baseoff;
hi = baseoff + arena.diskstats.used;
fprint(2, "\t%llx-%llx: data (%llx)\n", lo, hi, hi - lo);
hi = head->size - head->blocksize;
clumpmax = head->blocksize / ClumpInfoSize;
if(clumpmax > 0)
lo = hi - (u64int)arena.diskstats.clumps/clumpmax * head->blocksize;
else
lo = hi;
fprint(2, "\t%llx-%llx: clumps (%llx)\n", lo, hi, hi - lo);
fprint(2, "\t%llx-%llx: tail\n", hi, hi + head->blocksize);
fprint(2, "arena:\n");
printarena(2, &arena);
return 0;
}
static void
cmparena(char *name, vlong len)
{
ArenaHead head;
DigestState s;
u64int n, e;
u32int bs;
int i, j;
char buf[20];
fprint(2, "cmp %s\n", name);
memset(&s, 0, sizeof s);
/*
* read a little bit, which will include the header
*/
if(readblock(fd, data, HeadSize) < 0){
fprint(2, "%s: reading header: %r\n", name);
return;
}
if(unpackarenahead(&head, data) < 0){
fprint(2, "%s: corrupt arena header: %r\n", name);
return;
}
if(head.version != ArenaVersion4 && head.version != ArenaVersion5)
fprint(2, "%s: warning: unknown arena version %d\n", name, head.version);
if(len != 0 && len != head.size)
fprint(2, "%s: warning: unexpected length %lld != %lld\n", name, head.size, len);
if(strcmp(name, "<stdin>") != 0 && strcmp(head.name, name) != 0)
fprint(2, "%s: warning: unexpected name %s\n", name, head.name);
if(readblock(fd1, data1, HeadSize) < 0){
fprint(2, "%s: reading header: %r\n", name);
return;
}
if(unpackarenahead(&head, data) < 0){
fprint(2, "%s: corrupt arena header: %r\n", name);
return;
}
if(head.version != ArenaVersion4 && head.version != ArenaVersion5)
fprint(2, "%s: warning: unknown arena version %d\n", name, head.version);
if(len != 0 && len != head.size)
fprint(2, "%s: warning: unexpected length %lld != %lld\n", name, head.size, len);
if(strcmp(name, "<stdin>") != 0 && strcmp(head.name, name) != 0)
fprint(2, "%s: warning: unexpected name %s\n", name, head.name);
seek(fd, -HeadSize, 1);
seek(fd1, -HeadSize, 1);
if(printheader(name, &head, fd) < 0)
return;
/*
* now we know how much to read
* read everything but the last block, which is special
*/
e = head.size;
bs = blocksize;
for(n = 0; n < e; n += bs){
if(n + bs > e)
bs = e - n;
if(readblock(fd, data, bs) < 0){
fprint(2, "%s: read data: %r\n", name);
return;
}
if(readblock(fd1, data1, bs) < 0){
fprint(2, "%s: read data: %r\n", name);
return;
}
if(memcmp(data, data1, bs) != 0){
print("mismatch at %llx\n", n);
for(i=0; i<bs; i+=16){
if(memcmp(data+i, data1+i, 16) != 0){
snprint(buf, sizeof buf, "%llx", n+i);
print("%s ", buf);
for(j=0; j<16; j++){
print(" %.2ux", data[i+j]);
if(j == 7)
print(" -");
}
print("\n");
print("%*s ", (int)strlen(buf), "");
for(j=0; j<16; j++){
print(" %.2ux", data1[i+j]);
if(j == 7)
print(" -");
}
print("\n");
}
}
}
}
}
static int
shouldcheck(char *name, char **s, int n)
{
int i;
if(n == 0)
return 1;
for(i=0; i<n; i++){
if(s[i] && strcmp(name, s[i]) == 0){
s[i] = nil;
return 1;
}
}
return 0;
}
char *
readap(int fd, ArenaPart *ap)
{
char *table;
if(preadblock(fd, data, 8192, PartBlank) < 0)
sysfatal("read arena part header: %r");
if(unpackarenapart(ap, data) < 0)
sysfatal("corrupted arena part header: %r");
fprint(2, "# arena part version=%d blocksize=%d arenabase=%d\n",
ap->version, ap->blocksize, ap->arenabase);
ap->tabbase = (PartBlank+HeadSize+ap->blocksize-1)&~(ap->blocksize-1);
ap->tabsize = ap->arenabase - ap->tabbase;
table = malloc(ap->tabsize+1);
if(preadblock(fd, (uchar*)table, ap->tabsize, ap->tabbase) < 0)
sysfatal("reading arena part directory: %r");
table[ap->tabsize] = 0;
return table;
}
void
threadmain(int argc, char *argv[])
{
int i, nline;
char *p, *q, *table, *table1, *f[10], line[256];
vlong start, stop;
ArenaPart ap;
ArenaPart ap1;
ventifmtinstall();
blocksize = MaxIoSize;
ARGBEGIN{
case 'b':
blocksize = unittoull(EARGF(usage()));
break;
case 's':
sleepms = atoi(EARGF(usage()));
break;
case 'v':
verbose++;
break;
default:
usage();
break;
}ARGEND
if(argc < 2)
usage();
data = vtmalloc(blocksize);
data1 = vtmalloc(blocksize);
if((fd = open(argv[0], OREAD)) < 0)
sysfatal("open %s: %r", argv[0]);
if((fd1 = open(argv[1], OREAD)) < 0)
sysfatal("open %s: %r", argv[0]);
table = readap(fd, &ap);
table1 = readap(fd1, &ap1);
if(strcmp(table, table1) != 0)
sysfatal("arena partitions do not have identical tables");
nline = atoi(table);
p = strchr(table, '\n');
if(p)
p++;
for(i=0; i<nline; i++){
if(p == nil){
fprint(2, "warning: unexpected arena table end\n");
break;
}
q = strchr(p, '\n');
if(q)
*q++ = 0;
if(strlen(p) >= sizeof line){
fprint(2, "warning: long arena table line: %s\n", p);
p = q;
continue;
}
strcpy(line, p);
memset(f, 0, sizeof f);
if(tokenize(line, f, nelem(f)) < 3){
fprint(2, "warning: bad arena table line: %s\n", p);
p = q;
continue;
}
p = q;
if(shouldcheck(f[0], argv+1, argc-1)){
start = strtoull(f[1], 0, 0);
stop = strtoull(f[2], 0, 0);
if(stop <= start){
fprint(2, "%s: bad start,stop %lld,%lld\n", f[0], stop, start);
continue;
}
if(seek(fd, start, 0) < 0)
fprint(2, "%s: seek to start: %r\n", f[0]);
if(seek(fd1, start, 0) < 0)
fprint(2, "%s: seek to start: %r\n", f[0]);
cmparena(f[0], stop - start);
}
}
for(i=2; i<argc; i++)
if(argv[i] != 0)
fprint(2, "%s: did not find arena\n", argv[i]);
threadexitsall(nil);
}