Import sources from 2011-03-30 iso image

1 files changed, 106 insertions, 0 deletions

diff --git a/sys/src/cmd/9nfs/xfile.c b/sys/src/cmd/9nfs/xfile.c
new file mode 100755
index 000000000..6f294d6d9
--- /dev/null
+++ b/sys/src/cmd/9nfs/xfile.c
@@ -0,0 +1,106 @@
+#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;
+}