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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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