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 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/kernel.h> 43 #include <sys/lock.h> 44 #include <sys/mac.h> 45 #include <sys/malloc.h> 46 #include <sys/mount.h> 47 #include <sys/proc.h> 48 #include <sys/vnode.h> 49 50 #include <fs/devfs/devfs.h> 51 52 MALLOC_DEFINE(M_DEVFS, "DEVFS", "DEVFS data"); 53 54 static vfs_nmount_t devfs_nmount; 55 static vfs_unmount_t devfs_unmount; 56 static vfs_root_t devfs_root; 57 static vfs_statfs_t devfs_statfs; 58 59 /* 60 * Mount the filesystem 61 */ 62 static int 63 devfs_nmount(mp, ndp, td) 64 struct mount *mp; 65 struct nameidata *ndp; 66 struct thread *td; 67 { 68 int error; 69 struct devfs_mount *fmp; 70 struct vnode *rvp; 71 72 error = 0; 73 /* 74 * XXX: flag changes. 75 */ 76 if (mp->mnt_flag & MNT_UPDATE) 77 return (EOPNOTSUPP); 78 79 MALLOC(fmp, struct devfs_mount *, sizeof(struct devfs_mount), 80 M_DEVFS, M_WAITOK | M_ZERO); 81 MALLOC(fmp->dm_dirent, struct devfs_dirent **, 82 sizeof(struct devfs_dirent *) * NDEVFSINO, 83 M_DEVFS, M_WAITOK | M_ZERO); 84 lockinit(&fmp->dm_lock, PVFS, "devfs", 0, LK_NOPAUSE); 85 86 mp->mnt_flag |= MNT_LOCAL; 87 #ifdef MAC 88 mp->mnt_flag |= MNT_MULTILABEL; 89 #endif 90 fmp->dm_mount = mp; 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(mp, "", 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->dm_dirent, M_DEVFS); 140 free(fmp, M_DEVFS); 141 return 0; 142 } 143 144 /* Return locked reference to root. */ 145 146 static int 147 devfs_root(mp, vpp) 148 struct mount *mp; 149 struct vnode **vpp; 150 { 151 int error; 152 struct thread *td; 153 struct vnode *vp; 154 struct devfs_mount *dmp; 155 156 td = curthread; /* XXX */ 157 dmp = VFSTODEVFS(mp); 158 error = devfs_allocv(dmp->dm_rootdir, mp, &vp, td); 159 if (error) 160 return (error); 161 vp->v_vflag |= VV_ROOT; 162 *vpp = vp; 163 return (0); 164 } 165 166 static int 167 devfs_statfs(mp, sbp, td) 168 struct mount *mp; 169 struct statfs *sbp; 170 struct thread *td; 171 { 172 173 sbp->f_flags = 0; 174 sbp->f_bsize = DEV_BSIZE; 175 sbp->f_iosize = DEV_BSIZE; 176 sbp->f_blocks = 2; /* 1K to keep df happy */ 177 sbp->f_bfree = 0; 178 sbp->f_bavail = 0; 179 sbp->f_files = 0; 180 sbp->f_ffree = 0; 181 if (sbp != &mp->mnt_stat) { 182 sbp->f_type = mp->mnt_vfc->vfc_typenum; 183 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 184 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 185 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 186 } 187 return (0); 188 } 189 190 static struct vfsops devfs_vfsops = { 191 NULL, 192 vfs_stdstart, 193 devfs_unmount, 194 devfs_root, 195 vfs_stdquotactl, 196 devfs_statfs, 197 vfs_stdsync, 198 vfs_stdvget, 199 vfs_stdfhtovp, 200 vfs_stdcheckexp, 201 vfs_stdvptofh, 202 vfs_stdinit, 203 vfs_stduninit, 204 vfs_stdextattrctl, 205 devfs_nmount, 206 }; 207 208 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC); 209