ref: a8083462e62459b2ae8a243dc4ba88416eba03b1
dir: /liblogfs/replay.c/
#include "logfsos.h"
#include "logfs.h"
#include "local.h"
#include "fcall.h"
static void
maxpath(LogfsServer *server, ulong p)
{
if(p > server->path)
server->path = p;
}
static char *
recreate(LogfsServer *server, LogMessage *s, int *ok)
{
Entry *parent;
char *errmsg;
Entry *e;
Path *p;
parent = logfspathmapfinde(server->pathmap, s->path);
if(parent == nil)
return "can't find parent";
if(logfspathmapfindentry(server->pathmap, s->u.create.newpath) != nil){
Entry *d = logfspathmapfinde(server->pathmap, s->u.create.newpath);
if(d == nil)
print("existing was nil\n");
else{
print("existing: name=%q d=%d path=%8.8llux uid=%q gid=%q perm=%#uo\n",
d->name, d->deadandgone, d->qid.path, d->uid, d->gid, d->perm);
}
return "duplicate path";
}
if((parent->qid.type & QTDIR) == 0)
return Enotdir;
errmsg = logfsentrynew(server, 1, s->u.create.newpath, parent,
s->u.create.name, s->u.create.uid, s->u.create.gid, s->u.create.mtime, s->u.create.uid,
s->u.create.perm, s->u.create.cvers, 0, &e);
if(errmsg) {
*ok = 0;
return errmsg;
}
/* p guaranteed to be non null */
errmsg = logfspathmapnewentry(server->pathmap, s->u.create.newpath, e, &p);
if(errmsg) {
logfsfreemem(e);
*ok = 0;
return errmsg;
}
e->next = parent->u.dir.list;
parent->u.dir.list = e;
return nil;
}
static char *
reremove(LogfsServer *server, LogMessage *s, int *ok)
{
Entry *oe;
Entry *parent;
Entry **ep;
Entry *e;
char *ustmuid;
USED(ok);
oe = logfspathmapfinde(server->pathmap, s->path);
if(oe == nil)
return logfseunknownpath;
parent = oe->parent;
if(parent == oe)
return "tried to remove root";
if((parent->qid.type & QTDIR) == 0)
return Enotdir;
if((oe->qid.type & QTDIR) != 0 && oe->u.dir.list)
return logfsenotempty;
for(ep = &parent->u.dir.list; e = *ep; ep = &e->next)
if(e == oe)
break;
if(e == nil)
return logfseinternal;
ustmuid = logfsisustadd(server->is, s->u.remove.muid);
if(ustmuid == nil)
return Enomem;
parent->mtime = s->u.remove.mtime;
parent->muid = ustmuid;
logfspathmapdeleteentry(server->pathmap, s->path);
*ep = e->next;
if(e->inuse > 1) {
print("replay: entry inuse > 1\n");
e->inuse = 1;
}
logfsentryclunk(e);
return nil;
}
static char *
retrunc(LogfsServer *server, LogMessage *s, int *ok)
{
Entry *e;
char *ustmuid;
USED(ok);
e = logfspathmapfinde(server->pathmap, s->path);
if(e == nil)
return logfseunknownpath;
if((e->qid.type & QTDIR) != 0)
return Eperm;
if(e->u.file.cvers >= s->u.trunc.cvers)
return "old news";
ustmuid = logfsisustadd(server->is, s->u.trunc.muid);
if(ustmuid == nil)
return Enomem;
e->muid = ustmuid;
e->mtime = s->u.trunc.mtime;
e->qid.vers++;
e->u.file.cvers = s->u.trunc.cvers;
/*
* zap all extents
*/
logfsextentlistreset(e->u.file.extent);
e->u.file.length = 0;
return nil;
}
static char *
rewrite(LogfsServer *server, LogMessage *s, int *ok)
{
Entry *e;
char *ustmuid;
Extent extent;
char *errmsg;
USED(ok);
e = logfspathmapfinde(server->pathmap, s->path);
if(e == nil)
return logfseunknownpath;
if((e->qid.type & QTDIR) != 0)
return Eperm;
if(e->u.file.cvers != s->u.write.cvers)
return nil;
ustmuid = logfsisustadd(server->is, s->u.write.muid);
if(ustmuid == nil)
return Enomem;
extent.min = s->u.write.offset;
extent.max = s->u.write.offset + s->u.write.count;
extent.flashaddr = s->u.write.flashaddr;
errmsg = logfsextentlistinsert(e->u.file.extent, &extent, nil);
if(errmsg)
return errmsg;
e->mtime = s->u.write.mtime;
e->muid = ustmuid;
if(extent.max > e->u.file.length)
e->u.file.length = extent.max;
/* TODO forsyth increments vers here; not sure whether necessary */
return nil;
}
static char *
rewstat(LogfsServer *server, LogMessage *s, int *ok)
{
Entry *e;
char *errmsg;
char *cname, *ustgid, *ustmuid;
char *ustuid;
USED(ok);
e = logfspathmapfinde(server->pathmap, s->path);
if(e == nil)
return logfseunknownpath;
cname = nil;
ustuid = nil;
ustgid = nil;
ustmuid = nil;
if(s->u.wstat.name) {
cname = logfsstrdup(s->u.wstat.name);
if(cname == nil) {
memerror:
errmsg = Enomem;
goto fail;
}
}
if(s->u.wstat.uid) {
ustuid = logfsisustadd(server->is, s->u.wstat.uid);
if(ustuid == nil)
goto memerror;
}
if(s->u.wstat.gid) {
ustgid = logfsisustadd(server->is, s->u.wstat.gid);
if(ustgid == nil)
goto memerror;
}
if(s->u.wstat.muid) {
ustmuid = logfsisustadd(server->is, s->u.wstat.muid);
if(ustmuid == nil)
goto memerror;
}
if(cname) {
logfsfreemem(e->name);
e->name = cname;
cname = nil;
}
if(ustuid)
e->uid = ustuid;
if(ustgid)
e->gid = ustgid;
if(ustmuid)
e->muid = ustmuid;
if(s->u.wstat.perm != ~0)
e->perm = (e->perm & DMDIR) | (s->u.wstat.perm & ~DMDIR);
if(s->u.wstat.mtime != ~0)
e->mtime = s->u.wstat.mtime;
errmsg = nil;
fail:
logfsfreemem(cname);
return errmsg;
}
static char *
replayblock(LogfsServer *server, LogSegment *seg, uchar *buf, long i, int *pagep, int disableerrors)
{
int page;
LogfsLowLevel *ll = server->ll;
LogfsLowLevelReadResult llrr;
ushort size;
LogMessage s;
int ppb = 1 << ll->l2pagesperblock;
int pagesize = 1 << ll->l2pagesize;
for(page = 0; page < ppb; page++) {
uchar *p, *bufend;
char *errmsg = (*ll->readpagerange)(ll, buf, seg->blockmap[i], page, 0, pagesize, &llrr);
if(errmsg)
return errmsg;
if(llrr != LogfsLowLevelReadResultOk)
logfsserverreplacelogblock(server, seg, i);
/* ignore failure to replace block */
if(server->trace > 1)
print("replaying seq %ld block %ld page %d\n", i, seg->blockmap[i], page);
p = buf;
if(*p == 0xff)
break;
bufend = p + pagesize;
while(p < bufend) {
int ok = 1;
size = logfsconvM2S(p, bufend - p, &s);
if(size == 0)
return "parse failure";
if(server->trace > 1) {
print(">> ");
logfsdumpS(&s);
print("\n");
}
if(s.type == LogfsLogTend)
break;
switch(s.type) {
case LogfsLogTstart:
break;
case LogfsLogTcreate:
maxpath(server, s.path);
maxpath(server, s.u.create.newpath);
errmsg = recreate(server, &s, &ok);
break;
case LogfsLogTtrunc:
maxpath(server, s.path);
errmsg = retrunc(server, &s, &ok);
break;
case LogfsLogTremove:
maxpath(server, s.path);
errmsg = reremove(server, &s, &ok);
break;
case LogfsLogTwrite:
maxpath(server, s.path);
errmsg = rewrite(server, &s, &ok);
break;
case LogfsLogTwstat:
maxpath(server, s.path);
errmsg = rewstat(server, &s, &ok);
break;
default:
return "bad tag in log page";
}
if(!ok)
return errmsg;
if(errmsg && !disableerrors){
print("bad replay: %s\n", errmsg);
print("on: "); logfsdumpS(&s); print("\n");
}
p += size;
}
}
*pagep = page;
return nil;
}
static int
map(void *magic, Extent *x, int hole)
{
LogfsServer *server;
LogfsLowLevel *ll;
long seq;
int page;
int offset;
Pageset mask;
DataBlock *db;
if(hole || (x->flashaddr & LogAddr) != 0)
return 1;
server = magic;
ll = server->ll;
logfsflashaddr2spo(server, x->flashaddr, &seq, &page, &offset);
if(seq >= server->ndatablocks || (db = server->datablock + seq)->block < 0) {
print("huntfordata: seq %ld invalid\n", seq);
return 1;
}
mask = logfsdatapagemask((x->max - x->min + offset + (1 << ll->l2pagesize) - 1) >> ll->l2pagesize, page);
//print("mask 0x%.8ux free 0x%.8ux dirty 0x%.8ux\n", mask, db->free, db->dirty);
if((db->free & mask) != mask)
print("huntfordata: data referenced more than once: block %ld(%ld) free 0x%.8llux mask 0x%.8llux\n",
seq, db->block, (u64int)db->free, (u64int)mask);
db->free &= ~mask;
db->dirty |= mask;
return 1;
}
static void
huntfordatainfile(LogfsServer *server, Entry *e)
{
logfsextentlistwalk(e->u.file.extent, map, server);
}
static void
huntfordataindir(LogfsServer *server, Entry *pe)
{
Entry *e;
for(e = pe->u.dir.list; e; e = e->next)
if(e->qid.type & QTDIR)
huntfordataindir(server, e);
else
huntfordatainfile(server, e);
}
char *
logfsreplay(LogfsServer *server, LogSegment *seg, int disableerrorsforfirstblock)
{
uchar *buf;
long i;
int page;
char *errmsg;
if(seg == nil || seg->curblockindex < 0)
return nil;
buf = logfsrealloc(nil, 1 << server->ll->l2pagesize);
if(buf == nil)
return Enomem;
for(i = 0; i <= seg->curblockindex; i++) {
errmsg = replayblock(server, seg, buf, i, &page, disableerrorsforfirstblock);
disableerrorsforfirstblock = 0;
if(errmsg) {
print("logfsreplay: error: %s\n", errmsg);
goto fail;
}
}
/*
* if the last block ended early, restart at the first free page
*/
if(page < (1 << server->ll->l2pagesperblock))
seg->curpage = page;
errmsg = nil;
fail:
logfsfreemem(buf);
return errmsg;
}
void
logfsreplayfinddata(LogfsServer *server)
{
huntfordataindir(server, &server->root);
if(server->trace > 0) {
long i;
DataBlock *db;
for(i = 0, db = server->datablock; i < server->ndatablocks; i++, db++) {
logfsfreeanddirtydatablockcheck(server, i);
if(db->block >= 0)
print("%4ld: free 0x%.8llux dirty 0x%.8llux\n", i, (u64int)server->datablock[i].free, (u64int)server->datablock[i].dirty);
}
}
}