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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #include <sys/types.h> 27 #include <sys/param.h> 28 #include <sys/vfs.h> 29 #include <sys/t_lock.h> 30 31 extern int swapinit(int fstype, char *name); 32 33 /* 34 * WARNING: THE POSITIONS OF FILESYSTEM TYPES IN THIS TABLE SHOULD NOT 35 * BE CHANGED. These positions are used in generating fsids and 36 * fhandles. Thus, changing positions will cause a server to change 37 * the fhandle it gives out for a file. It is okay to reuse formerly 38 * used slots, just be sure that we're not going to start supporting 39 * the former owner of the slot again. 40 * 41 * Since there's been some question about whether the above comment is 42 * true, let's provide more detail. Most filesystems call 43 * vfs_make_fsid with two arguments that go into making the fsid: the 44 * dev number, and the fs type number - which is the offset of the 45 * filesystem's entry in the below table. If you would like to check 46 * if the position of the filesystem in this table still affects the 47 * fsid, just check what arguments filesystems are calling 48 * vfs_make_fsid with. 49 * 50 * The scenario we're trying to prevent here is: 51 * 52 * NFS server gets upgraded to new kernel version with different vfssw 53 * Clients are -not- rebooted, still retain filehandles 54 * NFS server boots up and now the fsid of an exported fs is different 55 * --> Clients get stale file handle errors 56 */ 57 58 struct vfssw vfssw[] = { 59 { "BADVFS" }, /* invalid */ 60 { "specfs" }, /* SPECFS */ 61 { "ufs" }, /* UFS */ 62 { "fifofs" }, /* FIFOFS */ 63 { "namefs" }, /* NAMEFS */ 64 { "proc" }, /* PROCFS */ 65 { "samfs" }, /* QFS */ 66 { "nfs" }, /* NFS Version 2 */ 67 { "zfs" }, /* ZFS */ 68 { "hsfs" }, /* HSFS */ 69 { "lofs" }, /* LOFS */ 70 { "tmpfs" }, /* TMPFS */ 71 { "fd" }, /* FDFS */ 72 { "pcfs" }, /* PCFS */ 73 { "swapfs", swapinit }, /* SWAPFS */ 74 { "mntfs" }, /* MNTFS */ 75 { "devfs" }, /* DEVFS */ 76 { "dev" }, /* DEV */ 77 { "ctfs" }, /* CONTRACTFS */ 78 { "objfs" }, /* OBJFS */ 79 { "sharefs" }, /* SHAREFS */ 80 { "dcfs" }, /* DCFS */ 81 { "smbfs" }, /* SMBFS */ 82 { "" }, /* reserved for loadable fs */ 83 { "" }, 84 { "" }, 85 { "" }, 86 { "" }, 87 { "" }, 88 { "" }, 89 { "" }, 90 { "" }, 91 { "" }, 92 { "" }, 93 { "" }, 94 { "" }, 95 }; 96 97 const int nfstype = (sizeof (vfssw) / sizeof (vfssw[0])); 98