ref: 2a941967c8f06ee6f6eb63bf5399c0d2ba4b89df
dir: /check.c/
#include <u.h>
#include <libc.h>
#include <fcall.h>
#include <avl.h>
#include <atomic.h>
#include "dat.h"
#include "fns.h"
static int
isfree(vlong bp)
{
Arange *r, q;
Arena *a;
q.off = bp;
q.len = Blksz;
a = getarena(bp);
r = (Arange*)avllookup(a->free, &q, -1);
if(r == nil)
return 0;
return bp < (r->off + r->len);
}
static int
checktree(int fd, Blk *b, int h, Kvp *lo, Kvp *hi)
{
Kvp x, y;
Msg mx, my;
int i, r, fill;
Blk *c;
int fail;
Bptr bp;
fail = 0;
if(h < 0){
fprint(fd, "node too deep (loop?\n");
fail++;
return fail;
}
if(b->type == Tleaf){
if(h != 0){
fprint(fd, "unbalanced leaf\n");
fail++;
}
if(h != 0 && b->nval < 2){
fprint(fd, "warning: underfilled leaf %B\n", b->bp);
fail++;
}
}
if(b->type == Tpivot && b->nval < 2)
fprint(fd, "warning: underfilled pivot %B\n", b->bp);
getval(b, 0, &x);
if(lo && keycmp(lo, &x) > 0){
fprint(fd, "out of range keys %P != %P\n", lo, &x);
showblk(fd, b, "out of range", 1);
fail++;
}
for(i = 1; i < b->nval; i++){
getval(b, i, &y);
if(hi && keycmp(&y, hi) >= 0){
fprint(fd, "out of range keys %P >= %P\n", &y, hi);
fail++;
}
if(b->type == Tpivot){
bp = getptr(&x, &fill);
if(isfree(bp.addr)){
fprint(fd, "freed block in use: %llx\n", bp.addr);
fail++;
}
if((c = getblk(bp, 0)) == nil){
fprint(fd, "corrupt block: %B\n", bp);
fail++;
continue;
}
if(blkfill(c) != fill){
fprint(fd, "mismatched block fill\n");
fail++;
}
if(checktree(fd, c, h - 1, &x, &y))
fail++;
dropblk(c);
}
r = keycmp(&x, &y);
switch(r){
case -1:
break;
case 0:
fprint(fd, "duplicate keys %P, %P\n", &x, &y);
fail++;
break;
case 1:
fprint(fd, "misordered keys %P, %P\n", &x, &y);
fail++;
break;
}
x = y;
}
if(b->type == Tpivot){
getval(b, b->nval-1, &y);
bp = getptr(&x, &fill);
if((c = getblk(bp, 0)) == nil){
fprint(fd, "corrupt block: %B\n", bp);
fail++;
}
if(c != nil && checktree(fd, c, h - 1, &y, nil))
fail++;
dropblk(c);
if(b->nbuf > 0){
getmsg(b, 0, &mx);
if(hi && keycmp(&mx, hi) >= 0){
fprint(fd, "out of range messages %P != %M\n", hi, &mx);
fail++;
}
}
for(i = 1; i < b->nbuf; i++){
getmsg(b, i, &my);
switch(my.op){
case Owstat: /* kvp dirent */
if((my.v[0] & ~(Owsize|Owmode|Owmtime|Owatime|Owuid|Owgid|Owmuid)) != 0){
fprint(fd, "invalid stat op %x\n", my.v[0]);
fail++;
}
break;
default:
if(my.op <= 0 || my.op >= Nmsgtype){
fprint(fd, "invalid message op %d\n", my.op);
fail++;
}
break;
}
if(hi && keycmp(&y, hi) > 0){
fprint(fd, "out of range keys %P >= %P\n", &y, hi);
fail++;
}
if(keycmp(&mx, &my) == 1){
fprint(fd, "misordered keys %P, %P\n", &x, &y);
fail++;
break;
}
mx = my;
}
}
return fail;
}
static int
checklog(int fd, Bptr hd)
{
Bptr bp, nb;
Blk *b;
bp = (Bptr){-1, -1, -1};
for(bp = hd; bp.addr != -1; bp = nb){
if(waserror()){
fprint(fd, "error loading %B\n", bp);
return 0;
}
traceb("chklg", bp);
b = getblk(bp, 0);
nb = b->logp;
dropblk(b);
poperror();
}
return 1;
}
static int
checkfree(int fd)
{
Arena *a;
Arange *r, *n;
int i, fail;
fail = 0;
for(i = 0; i < fs->narena; i++){
a = &fs->arenas[i];
qlock(a);
r = (Arange*)avlmin(a->free);
for(n = (Arange*)avlnext(r); n != nil; n = (Arange*)avlnext(n)){
if(r->off >= n->off){
fprint(2, "misordered length %llx >= %llx\n", r->off, n->off);
fail++;
}
if(r->off+r->len >= n->off){
fprint(2, "overlaping range %llx+%llx >= %llx\n", r->off, r->len, n->off);
fail++;
}
r = n;
}
if(!checklog(fd, a->loghd))
fprint(fd, "arena %d: broken freelist\n", i);
qunlock(a);
}
return fail;
}
static int
checkdlist(int fd)
{
char pfx[1];
Dlist dl;
Scan s;
checklog(fd, fs->snapdl.hd);
pfx[0] = Kdlist;
btnewscan(&s, pfx, 1);
btenter(&fs->snap, &s);
while(1){
if(!btnext(&s, &s.kv))
break;
kv2dlist(&s.kv, &dl);
if(!checklog(fd, dl.hd))
print("bad dlist %P: %s\n", &s.kv, errmsg());
}
btexit(&s);
return 0;
}
static int
checkdata(int, Tree *t)
{
char pfx[1];
Bptr bp;
Scan s;
Blk *b;
pfx[0] = Klabel;
btnewscan(&s, pfx, 1);
btenter(t, &s);
while(1){
if(!btnext(&s, &s.kv))
break;
bp = unpackbp(s.kv.v, s.kv.nv);
if(isfree(bp.addr)){
fprint(2, "free block in use: %B\n", bp);
error("free block in use");
}
b = getblk(bp, GBraw);
dropblk(b);
}
btexit(&s);
return 0;
}
int
checkfs(int fd)
{
int ok, height;
char pfx[1], name[Keymax+1];
Tree *t;
Scan s;
Blk *b;
ok = 1;
ainc(&fs->rdonly);
epochwait();
if(waserror()){
fprint(fd, "error checking %s\n", errmsg());
return 0;
}
fprint(fd, "checking freelist\n");
if(checkfree(fd))
ok = 0;
fprint(fd, "checking deadlist\n");
if(checkdlist(fd))
ok = 0;
fprint(fd, "checking snap tree: %B\n", fs->snap.bp);
if((b = getroot(&fs->snap, &height)) != nil){
if(checktree(fd, b, height-1, nil, 0))
ok = 0;
dropblk(b);
}
pfx[0] = Klabel;
btnewscan(&s, pfx, 1);
btenter(&fs->snap, &s);
while(1){
if(!btnext(&s, &s.kv))
break;
if(waserror()){
fprint(fd, "moving on: %s\n", errmsg());
continue;
}
memcpy(name, s.kv.k+1, s.kv.nk-1);
name[s.kv.nk-1] = 0;
if((t = opensnap(name, nil)) == nil){
fprint(2, "invalid snap label %s\n", name);
ok = 0;
break;
}
fprint(fd, "checking snap %s: %B\n", name, t->bp);
b = getroot(t, &height);
if(checktree(fd, b, height-1, nil, 0))
ok = 0;
if(checkdata(fd, t))
ok = 0;
dropblk(b);
poperror();
}
btexit(&s);
adec(&fs->rdonly);
poperror();
return ok;
}