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 vfs_nmount_t devfs_nmount; 56 static vfs_unmount_t devfs_unmount; 57 static vfs_root_t devfs_root; 58 static vfs_statfs_t devfs_statfs; 59 60 /* 61 * Mount the filesystem 62 */ 63 static int 64 devfs_nmount(mp, ndp, td) 65 struct mount *mp; 66 struct nameidata *ndp; 67 struct thread *td; 68 { 69 int error; 70 struct devfs_mount *fmp; 71 struct vnode *rvp; 72 73 error = 0; 74 /* 75 * XXX: flag changes. 76 */ 77 if (mp->mnt_flag & MNT_UPDATE) 78 return (EOPNOTSUPP); 79 80 MALLOC(fmp, struct devfs_mount *, sizeof(struct devfs_mount), 81 M_DEVFS, M_WAITOK | M_ZERO); 82 MALLOC(fmp->dm_dirent, struct devfs_dirent **, 83 sizeof(struct devfs_dirent *) * NDEVFSINO, 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 fmp->dm_mount = mp; 92 mp->mnt_data = (qaddr_t) fmp; 93 vfs_getnewfsid(mp); 94 95 fmp->dm_inode = DEVFSINOMOUNT; 96 97 fmp->dm_rootdir = devfs_vmkdir("(root)", 6, NULL); 98 fmp->dm_rootdir->de_inode = 2; 99 #ifdef MAC 100 mac_create_devfs_directory(mp, "", 0, fmp->dm_rootdir); 101 #endif 102 fmp->dm_basedir = fmp->dm_rootdir; 103 devfs_rules_newmount(fmp, td); 104 105 error = devfs_root(mp, &rvp); 106 if (error) { 107 lockdestroy(&fmp->dm_lock); 108 FREE(fmp, M_DEVFS); 109 return (error); 110 } 111 VOP_UNLOCK(rvp, 0, td); 112 113 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 114 bcopy("devfs", mp->mnt_stat.f_mntfromname, sizeof("devfs")); 115 (void)devfs_statfs(mp, &mp->mnt_stat, td); 116 117 return (0); 118 } 119 120 static int 121 devfs_unmount(mp, mntflags, td) 122 struct mount *mp; 123 int mntflags; 124 struct thread *td; 125 { 126 int error; 127 int flags = 0; 128 struct devfs_mount *fmp; 129 130 fmp = VFSTODEVFS(mp); 131 if (mntflags & MNT_FORCE) 132 flags |= FORCECLOSE; 133 /* There is 1 extra root vnode reference from devfs_mount(). */ 134 error = vflush(mp, 1, flags); 135 if (error) 136 return (error); 137 devfs_purge(fmp->dm_rootdir); 138 mp->mnt_data = 0; 139 lockdestroy(&fmp->dm_lock); 140 free(fmp->dm_dirent, M_DEVFS); 141 free(fmp, M_DEVFS); 142 return 0; 143 } 144 145 /* Return locked reference to root. */ 146 147 static int 148 devfs_root(mp, vpp) 149 struct mount *mp; 150 struct vnode **vpp; 151 { 152 int error; 153 struct thread *td; 154 struct vnode *vp; 155 struct devfs_mount *dmp; 156 157 td = curthread; /* XXX */ 158 dmp = VFSTODEVFS(mp); 159 error = devfs_allocv(dmp->dm_rootdir, mp, &vp, td); 160 if (error) 161 return (error); 162 vp->v_vflag |= VV_ROOT; 163 *vpp = vp; 164 return (0); 165 } 166 167 static int 168 devfs_statfs(mp, sbp, td) 169 struct mount *mp; 170 struct statfs *sbp; 171 struct thread *td; 172 { 173 174 sbp->f_flags = 0; 175 sbp->f_bsize = DEV_BSIZE; 176 sbp->f_iosize = DEV_BSIZE; 177 sbp->f_blocks = 2; /* 1K to keep df happy */ 178 sbp->f_bfree = 0; 179 sbp->f_bavail = 0; 180 sbp->f_files = 0; 181 sbp->f_ffree = 0; 182 if (sbp != &mp->mnt_stat) { 183 sbp->f_type = mp->mnt_vfc->vfc_typenum; 184 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 185 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 186 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 187 } 188 return (0); 189 } 190 191 static struct vfsops devfs_vfsops = { 192 NULL, 193 vfs_stdstart, 194 devfs_unmount, 195 devfs_root, 196 vfs_stdquotactl, 197 devfs_statfs, 198 vfs_stdsync, 199 vfs_stdvget, 200 vfs_stdfhtovp, 201 vfs_stdcheckexp, 202 vfs_stdvptofh, 203 vfs_stdinit, 204 vfs_stduninit, 205 vfs_stdextattrctl, 206 devfs_nmount, 207 }; 208 209 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC); 210 #endif 211