1 /* 2 * Copyright (c) 1992, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (c) 2000 5 * Poul-Henning Kamp. All rights reserved. 6 * 7 * This code is derived from software donated to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)kernfs_vfsops.c 8.10 (Berkeley) 5/14/95 32 * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vfsops.c 1.36 33 * 34 * $FreeBSD$ 35 */ 36 37 #include "opt_devfs.h" 38 #include "opt_mac.h" 39 #ifndef NODEVFS 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/lock.h> 45 #include <sys/mac.h> 46 #include <sys/malloc.h> 47 #include <sys/mount.h> 48 #include <sys/proc.h> 49 #include <sys/vnode.h> 50 51 #include <fs/devfs/devfs.h> 52 53 MALLOC_DEFINE(M_DEVFS, "DEVFS", "DEVFS data"); 54 55 static int devfs_mount(struct mount *mp, struct nameidata *ndp, 56 struct thread *td); 57 static int devfs_unmount(struct mount *mp, int mntflags, 58 struct thread *td); 59 static int devfs_root(struct mount *mp, struct vnode **vpp); 60 static int devfs_statfs(struct mount *mp, struct statfs *sbp, 61 struct thread *td); 62 63 /* 64 * Mount the filesystem 65 */ 66 static int 67 devfs_mount(mp, ndp, td) 68 struct mount *mp; 69 struct nameidata *ndp; 70 struct thread *td; 71 { 72 int error; 73 struct devfs_mount *fmp; 74 struct vnode *rvp; 75 76 error = 0; 77 /* 78 * XXX: flag changes. 79 */ 80 if (mp->mnt_flag & MNT_UPDATE) 81 return (EOPNOTSUPP); 82 83 MALLOC(fmp, struct devfs_mount *, sizeof(struct devfs_mount), 84 M_DEVFS, M_WAITOK | M_ZERO); 85 lockinit(&fmp->dm_lock, PVFS, "devfs", 0, LK_NOPAUSE); 86 87 mp->mnt_flag |= MNT_LOCAL; 88 #ifdef MAC 89 mp->mnt_flag |= MNT_MULTILABEL; 90 #endif 91 mp->mnt_data = (qaddr_t) fmp; 92 vfs_getnewfsid(mp); 93 94 fmp->dm_inode = DEVFSINOMOUNT; 95 96 fmp->dm_rootdir = devfs_vmkdir("(root)", 6, NULL); 97 fmp->dm_rootdir->de_inode = 2; 98 #ifdef MAC 99 mac_create_devfs_directory("", 0, fmp->dm_rootdir); 100 #endif 101 fmp->dm_basedir = fmp->dm_rootdir; 102 devfs_rules_newmount(fmp, td); 103 104 error = devfs_root(mp, &rvp); 105 if (error) { 106 lockdestroy(&fmp->dm_lock); 107 FREE(fmp, M_DEVFS); 108 return (error); 109 } 110 VOP_UNLOCK(rvp, 0, td); 111 112 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 113 bcopy("devfs", mp->mnt_stat.f_mntfromname, sizeof("devfs")); 114 (void)devfs_statfs(mp, &mp->mnt_stat, td); 115 116 return (0); 117 } 118 119 static int 120 devfs_unmount(mp, mntflags, td) 121 struct mount *mp; 122 int mntflags; 123 struct thread *td; 124 { 125 int error; 126 int flags = 0; 127 struct devfs_mount *fmp; 128 129 fmp = VFSTODEVFS(mp); 130 if (mntflags & MNT_FORCE) 131 flags |= FORCECLOSE; 132 /* There is 1 extra root vnode reference from devfs_mount(). */ 133 error = vflush(mp, 1, flags); 134 if (error) 135 return (error); 136 devfs_purge(fmp->dm_rootdir); 137 mp->mnt_data = 0; 138 lockdestroy(&fmp->dm_lock); 139 free(fmp, M_DEVFS); 140 return 0; 141 } 142 143 /* Return locked reference to root. */ 144 145 static int 146 devfs_root(mp, vpp) 147 struct mount *mp; 148 struct vnode **vpp; 149 { 150 int error; 151 struct thread *td; 152 struct vnode *vp; 153 struct devfs_mount *dmp; 154 155 td = curthread; /* XXX */ 156 dmp = VFSTODEVFS(mp); 157 error = devfs_allocv(dmp->dm_rootdir, mp, &vp, td); 158 if (error) 159 return (error); 160 vp->v_flag |= VROOT; 161 *vpp = vp; 162 return (0); 163 } 164 165 static int 166 devfs_statfs(mp, sbp, td) 167 struct mount *mp; 168 struct statfs *sbp; 169 struct thread *td; 170 { 171 172 sbp->f_flags = 0; 173 sbp->f_bsize = DEV_BSIZE; 174 sbp->f_iosize = DEV_BSIZE; 175 sbp->f_blocks = 2; /* 1K to keep df happy */ 176 sbp->f_bfree = 0; 177 sbp->f_bavail = 0; 178 sbp->f_files = 0; 179 sbp->f_ffree = 0; 180 if (sbp != &mp->mnt_stat) { 181 sbp->f_type = mp->mnt_vfc->vfc_typenum; 182 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 183 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 184 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 185 } 186 return (0); 187 } 188 189 static struct vfsops devfs_vfsops = { 190 NULL, 191 vfs_stdstart, 192 devfs_unmount, 193 devfs_root, 194 vfs_stdquotactl, 195 devfs_statfs, 196 vfs_stdsync, 197 vfs_stdvget, 198 vfs_stdfhtovp, 199 vfs_stdcheckexp, 200 vfs_stdvptofh, 201 vfs_stdinit, 202 vfs_stduninit, 203 vfs_stdextattrctl, 204 devfs_mount, 205 }; 206 207 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC); 208 #endif 209