1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 /* SunOS-4.1 1.16 */ 29 30 #include <sys/types.h> 31 #include <sys/param.h> 32 #include <sys/vfs.h> 33 #include <sys/t_lock.h> 34 35 extern struct vfsops vfs_strayops; /* XXX move here from vfs.c ? */ 36 37 extern int swapinit(int fstype, char *name); 38 39 /* 40 * WARNING: THE POSITIONS OF FILESYSTEM TYPES IN THIS TABLE SHOULD NOT 41 * BE CHANGED. These positions are used in generating fsids and 42 * fhandles. Thus, changing positions will cause a server to change 43 * the fhandle it gives out for a file. It is okay to reuse formerly 44 * used slots, just be sure that we're not going to start supporting 45 * the former owner of the slot again. 46 * 47 * Since there's been some question about whether the above comment is 48 * true, let's provide more detail. Most filesystems call 49 * vfs_make_fsid with two arguments that go into making the fsid: the 50 * dev number, and the fs type number - which is the offset of the 51 * filesystem's entry in the below table. If you would like to check 52 * if the position of the filesystem in this table still affects the 53 * fsid, just check what arguments filesystems are calling 54 * vfs_make_fsid with. 55 * 56 * The scenario we're trying to prevent here is: 57 * 58 * NFS server gets upgraded to new kernel version with different vfssw 59 * Clients are -not- rebooted, still retain filehandles 60 * NFS server boots up and now the fsid of an exported fs is different 61 * --> Clients get stale file handle errors 62 */ 63 64 struct vfssw vfssw[] = { 65 { "BADVFS" }, /* invalid */ 66 { "specfs" }, /* SPECFS */ 67 { "ufs" }, /* UFS */ 68 { "fifofs" }, /* FIFOFS */ 69 { "namefs" }, /* NAMEFS */ 70 { "proc" }, /* PROCFS */ 71 { "samfs" }, /* QFS */ 72 { "nfs" }, /* NFS Version 2 */ 73 { "zfs" }, /* ZFS */ 74 { "hsfs" }, /* HSFS */ 75 { "lofs" }, /* LOFS */ 76 { "tmpfs" }, /* TMPFS */ 77 { "fd" }, /* FDFS */ 78 { "pcfs" }, /* PCFS */ 79 { "swapfs", swapinit }, /* SWAPFS */ 80 { "mntfs" }, /* MNTFS */ 81 { "devfs" }, /* DEVFS */ 82 { "ctfs" }, /* CONTRACTFS */ 83 { "objfs" }, /* OBJFS */ 84 { "" }, /* reserved for loadable fs */ 85 { "" }, 86 { "" }, 87 { "" }, 88 { "" }, 89 { "" }, 90 { "" }, 91 { "" }, 92 { "" }, 93 { "" }, 94 { "" }, 95 { "" }, 96 { "" }, 97 { "" }, 98 }; 99 100 const int nfstype = (sizeof (vfssw) / sizeof (vfssw[0])); 101