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tmpfs.c revision 1.3.2.1 
      1 /*	$NetBSD: tmpfs.c,v 1.3.2.1 2006/06/19 04:17:06 chap Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2006 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the NetBSD
     18  *	Foundation, Inc. and its contributors.
     19  * 4. Neither the name of The NetBSD Foundation nor the names of its
     20  *    contributors may be used to endorse or promote products derived
     21  *    from this software without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     24  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     25  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     26  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     27  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     28  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     30  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     31  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     32  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     33  * POSSIBILITY OF SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 __RCSID("$NetBSD: tmpfs.c,v 1.3.2.1 2006/06/19 04:17:06 chap Exp $");
     38 
     39 #include <sys/types.h>
     40 #include <sys/param.h>
     41 #include <sys/time.h>
     42 #include <sys/proc.h>
     43 #include <sys/stat.h>
     44 #include <sys/vnode.h>
     45 #include <sys/mount.h>
     46 
     47 #include <fs/tmpfs/tmpfs.h>
     48 
     49 #include <err.h>
     50 #include <kvm.h>
     51 #include "fstat.h"
     52 
     53 int
     54 tmpfs_filestat(struct vnode *vp, struct filestat *fsp)
     55 {
     56 	struct tmpfs_node tn;
     57 	struct mount mt;
     58 
     59 	if (!KVM_READ(VP_TO_TMPFS_NODE(vp), &tn, sizeof(tn))) {
     60 		dprintf("can't read tmpfs_node at %p for pid %d",
     61 		    VP_TO_TMPFS_NODE(vp), Pid);
     62 		return 0;
     63 	}
     64 	if (!KVM_READ(vp->v_mount, &mt, sizeof(mt))) {
     65 		dprintf("can't read mount at %p for pid %d",
     66 		    vp->v_mount, Pid);
     67 		return 0;
     68 	}
     69 
     70 	fsp->fsid = mt.mnt_stat.f_fsidx.__fsid_val[0];
     71 	fsp->fileid = (long)tn.tn_id;
     72 	fsp->mode = tn.tn_mode | getftype(vp->v_type);
     73 	fsp->size = tn.tn_size;
     74 	switch (tn.tn_type) {
     75 	case VBLK:
     76 	case VCHR:
     77 		fsp->rdev = tn.tn_spec.tn_dev.tn_rdev;
     78 		break;
     79 	default:
     80 		fsp->rdev = 0;
     81 		break;
     82 	}
     83 
     84 	return 1;
     85 }
     86