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#include "all.h"
static Xfile * xflfree;
static Xfid * xfdfree;
#define FIDMOD 127 /* prime */
static Xfile *xfiles[FIDMOD];
static Lock xlocks[FIDMOD];
Xfile *
xfile(Qid *qid, void *s, int new)
{
int k;
Xfile **hp, *f, *pf;
k = ((ulong)qid->path ^ (((u32int)(uintptr)s)<<24))%FIDMOD;
hp = &xfiles[k];
lock(&xlocks[k]);
for(f=*hp, pf=0; f; pf=f, f=f->next)
if(f->qid.path == qid->path
&& (u32int)(uintptr)f->s == (u32int)(uintptr)s)
break;
if(f && pf){
pf->next = f->next;
f->next = *hp;
*hp = f;
}
if(new < 0 && f){
*hp = f->next;
f->next = xflfree;
xflfree = f;
f = 0;
}
if(new > 0 && !f){
if(!(f = xflfree)) /* assign = */
f = listalloc(1024/sizeof(Xfile), sizeof(Xfile));
xflfree = f->next;
memset(f, 0, sizeof(Xfile));
f->next = *hp;
*hp = f;
f->qid = *qid;
f->s = s;
}
unlock(&xlocks[k]);
return f;
}
Xfid *
xfid(char *uid, Xfile *xp, int new)
{
Xfid *f, *pf;
for(f=xp->users, pf=0; f; pf=f, f=f->next)
if(f->uid[0] == uid[0] && strcmp(f->uid, uid) == 0)
break;
if(f && pf){
pf->next = f->next;
f->next = xp->users;
xp->users = f;
}
if(new < 0 && f){
if(f->urfid)
clunkfid(xp->s, f->urfid);
if(f->opfid)
clunkfid(xp->s, f->opfid);
xp->users = f->next;
f->next = xfdfree;
xfdfree = f;
f = 0;
}
if(new > 0 && !f){
if(!(f = xfdfree)) /* assign = */
f = listalloc(1024/sizeof(Xfid), sizeof(Xfid));
xfdfree = f->next;
memset(f, 0, sizeof(Xfid));
f->next = xp->users;
xp->users = f;
f->xp = xp;
f->uid = strstore(uid);
f->urfid = 0;
f->opfid = 0;
}
return f;
}
int
xfpurgeuid(Session *s, char *uid)
{
Xfile **hp, *f;
Xfid *xf;
int k, count=0;
for(k=0; k<FIDMOD; k++){
lock(&xlocks[k]);
hp=&xfiles[k];
for(f=*hp; f; f=f->next)
if(f->s == s && (xf = xfid(uid, f, 0))){ /* assign = */
xfclear(xf);
++count;
}
unlock(&xlocks[k]);
}
return count;
}
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