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ext4srv: support ORCLOSE

--- a/sys/src/cmd/ext4srv/ext4srv.c

+++ b/sys/src/cmd/ext4srv/ext4srv.c

@@ -24,6 +24,7 @@

 		ext4_dir *dir;

 	};

 	int type;

+	bool rclose;

 };

 enum {

@@ -60,6 +61,7 @@

 	case OREAD:

 		p = AREAD;	

 		break;

+	case ORCLOSE:

 	case OWRITE:

 		p = AWRITE;

 		break;

@@ -225,6 +227,7 @@

 			responderror(r);

 			return;

 		}

+		a->rclose = (r->ifcall.mode & ORCLOSE) != 0;

 		break;

 Nomem:

@@ -721,12 +724,13 @@

 	a = oldfid->aux;

-	if((c = calloc(1, sizeof(*c))) == nil)

+	if((c = malloc(sizeof(*c))) == nil)

 		return "memory";

 	memmove(c, a, sizeof(*c));

 	c->path = estrdup9p(a->path);

 	c->file = nil;

 	c->dir = nil;

+	c->rclose = false;

 	incref(c->p);

 	newfid->aux = c;

@@ -750,6 +754,8 @@

 	}else if(a->type == Afile && a->file != nil){

 		ext4_fclose(a->file);

 		free(a->file);

+		if(a->rclose)

+			ext4_fremove(&a->p->mp, a->path);

 	}

 	if(decref(a->p) < 1)