ref: 390e726c64ee2aca967617ac7f7fd2a44f27646b
dir: /names.c/
#include "all.h"
s8
searchnames(Dentry *d, char *searchname, u64 *relip)
{
u16 searchnamelen, slen;
s8 *namebuf;
u64 n, reli;
Name nm;
/* is this valid? */
if(d == nil || searchname == nil || relip == nil ||
d->dblocks[In] == 0 || d->dblocks[Inl] == 0 ||
d->dblocks[Inle] == 0){
showdentry(2, (u8*)d);
panic("searchnames: should not be happening. searchname %s *relip %llud\n",
searchname, *relip);
}
searchnamelen = strlen(searchname);
if(searchnamelen == 0)
error(errstring[Ebadname]);
reli = *relip = 0;
slen = min(searchnamelen,Nfirst);
if(searchnamelen > Nfirst){
namebuf = emalloc9p(searchnamelen);
if(waserror()){
free(namebuf);
nexterror();
}
}else
namebuf = nil;
while(readfile(d->dblocks[In], d->qpath+1+In,
(s8*)&nm, sizeof(Name), reli*sizeof(Name)) == sizeof(Name)){
if(searchnamelen == nm.namelen &&
strncmp(nm.name, searchname, slen) == 0){
if(searchnamelen <= Nfirst){
*relip = reli;
return 1;
}else{
n = readfile(d->dblocks[Inl], d->qpath+1+Inl,
namebuf, searchnamelen, nm.noffset);
if(n != searchnamelen)
error(errstring[Einvread]);
if(n == searchnamelen &&
strncmp(searchname, namebuf, searchnamelen) == 0){
*relip = reli;
poperror();
free(namebuf);
return 1;
}
}
}
if(*relip == 0 && nm.namelen == 0)
*relip = reli; /* a zeroed out reli, reuse if none found */
reli++;
}
if(namebuf){
poperror();
free(namebuf);
}
/* nothing found */
if(*relip == 0)
*relip = reli; /* use a new reli at the end */
return 0;
}
void
newnames(Dentry *pd, u16 uid, u64 pdblkno, Iobuf **iobufs)
{
Iobuf *iobuf;
Dentry *d;
u8 i;
for(i = 0; i < 3; i++){
iobuf = iobufs[i];
pd->dblocks[i] = iobuf->blkno;
d = iobuf->d;
if(i == In)
d->flags = Fn;
else if(i == Inle)
d->flags = Fe;
d->flags |= Fsys;
d->pdblkno = pdblkno;
d->pqpath = pd->qpath;
d->preli = i;
d->uid = pd->uid;
d->gid = pd->gid;
d->muid = pd->muid;
d->mode = pd->mode & ~DMDIR;
d->mtime = nsec();
d->version = 1;
putbuf(iobuf, 1);
}
addname(pd, uid, 0, ".n");
addname(pd, uid, 1, ".nl");
addname(pd, uid, 2, ".nle");
}
/* returns namelen */
u16
readname(Dentry *pd, u64 preli, s8 **namep, u16 *namelen)
{
u16 n;
Name nm;
n = readfile(pd->dblocks[In], pd->qpath+1+In, (s8*)&nm, sizeof(Name), preli*sizeof(Name));
if(n != sizeof(Name))
error(errstring[Einvread]);
*namelen = nm.namelen;
*namep = emalloc9p(nm.namelen+1);
if(nm.namelen <= Nfirst){
strncpy(*namep, nm.name, nm.namelen);
return nm.namelen;
}
return readfile(pd->dblocks[Inl], pd->qpath+1+Inl, *namep, nm.namelen, nm.noffset);
}
void
rmname(Dentry *pd, s16 uid, u64 preli)
{
u64 n;
Name nm;
Extents *nes;
s8 esname[32];
n = readfile(pd->dblocks[In], pd->qpath+1+In, (s8*)&nm, sizeof(Name), preli*sizeof(Name));
if(n != sizeof(Name))
error(errstring[Einvread]);
if(nm.namelen > Nfirst){
nes = emalloc9p(sizeof(Extents));
if(waserror()){
freeextents(nes);
nexterror();
}
snprint(esname, 32, ".nle block %llud", pd->dblocks[Inle]);
initextents(nes, esname, 0, 0, 2, nil, dprintfd, panic, malloc9p);
loadextentsfile(pd->dblocks[Inle], pd->qpath+1+Inle, nes);
ufree(nes, nm.noffset, nm.namelen);
saveextentstofile(pd->dblocks[Inle], pd->qpath+1+Inle, uid, nes);
poperror();
freeextents(nes);
}
memset(&nm, 0, sizeof(Name));
n = writefile(pd->dblocks[In], pd->qpath+1+In, uid, (s8*)&nm, sizeof(Name), preli*sizeof(Name));
if(n != sizeof(Name))
error(errstring[Einvwrite]);
}
u16
addnamelen(Dentry *pd, u16 uid, u64 preli, s8 *name, u16 namelen)
{
Extents *nes;
s8 esname[32];
u64 start, size;
Name nm;
// dprint("addnamelen name %s len %d to In %llud Inl %llud preli %llud\n",
// name, namelen, pd->dblocks[In], pd->dblocks[Inl], preli);
nm.namelen = namelen;
strncpy(nm.name, name, Nfirst);
if(nm.namelen <= Nfirst){
nm.noffset = 0;
if(writefile(pd->dblocks[In], pd->qpath+1+In, uid,
(s8*)&nm, sizeof(Name), preli*sizeof(Name)) == sizeof(Name))
return nm.namelen;
return 0;
}
nes = emalloc9p(sizeof(Extents));
if(waserror()){
freeextents(nes);
nexterror();
}
snprint(esname, 32, ".nle block %llud", pd->dblocks[Inle]);
initextents(nes, esname, 0, 0, 2, nil, dprintfd, panic, malloc9p);
loadextentsfile(pd->dblocks[Inle], pd->qpath+1+Inle, nes);
/* reusing */
if(ualloc(nes, namelen, &start)){
if(writefile(pd->dblocks[Inl], pd->qpath+1+Inl, uid, name, nm.namelen, start) != namelen)
error(errstring[Einvwrite]);
nm.noffset = start;
saveextentstofile(pd->dblocks[Inle], pd->qpath+1+Inle, uid, nes);
}else{
nm.noffset = size = readfilesize(pd->dblocks[Inl], pd->qpath+1+Inl);
if(writefile(pd->dblocks[Inl], pd->qpath+1+Inl, uid, name, nm.namelen, size) != nm.namelen)
error(errstring[Einvwrite]);
}
poperror();
freeextents(nes);
if(writefile(pd->dblocks[In], pd->qpath+1+In, uid,
(s8*)&nm, sizeof(Name), preli*sizeof(Name)) != sizeof(Name))
error(errstring[Einvwrite]);
return nm.namelen;
}
u16
addname(Dentry *pd, u16 uid, u64 preli, s8 *name)
{
return addnamelen(pd, uid, preli, name, strlen(name));
}
u16
updatename(Dentry *pd, u16 uid, u64 preli, s8 *name)
{
u16 newlen, n;
Name nm;
// dprint("updatename name %s to In %llud Inl %llud preli %llud\n",
// name, pd->dblocks[In], pd->dblocks[Inl], preli);
/* if the namelen matches with the existing, change in-place */
newlen = strlen(name);
n = readfile(pd->dblocks[In], pd->qpath+1+In, (s8*)&nm, sizeof(Name), preli*sizeof(Name));
if(n != sizeof(Name))
error(errstring[Einvread]);
if(nm.namelen > Nfirst)
rmname(pd, uid, preli);
return addnamelen(pd, uid, preli, name, newlen);
}