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 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/kernel.h> 42 #include <sys/lock.h> 43 #include <sys/malloc.h> 44 #include <sys/mount.h> 45 #include <sys/proc.h> 46 #include <sys/socket.h> 47 #include <sys/vnode.h> 48 49 #include <fs/devfs/devfs.h> 50 51 MALLOC_DEFINE(M_DEVFS, "DEVFS", "DEVFS data"); 52 53 static int devfs_mount __P((struct mount *mp, char *path, caddr_t data, 54 struct nameidata *ndp, struct proc *p)); 55 static int devfs_unmount __P((struct mount *mp, int mntflags, 56 struct proc *p)); 57 static int devfs_root __P((struct mount *mp, struct vnode **vpp)); 58 static int devfs_statfs __P((struct mount *mp, struct statfs *sbp, 59 struct proc *p)); 60 61 /* 62 * Mount the filesystem 63 */ 64 static int 65 devfs_mount(mp, path, data, ndp, p) 66 struct mount *mp; 67 char *path; 68 caddr_t data; 69 struct nameidata *ndp; 70 struct proc *p; 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 mp->mnt_data = (qaddr_t) fmp; 89 vfs_getnewfsid(mp); 90 91 fmp->dm_inode = DEVFSINOMOUNT; 92 93 fmp->dm_rootdir = devfs_vmkdir("(root)", 6, NULL); 94 fmp->dm_rootdir->de_inode = 2; 95 fmp->dm_basedir = fmp->dm_rootdir; 96 97 error = devfs_root(mp, &rvp); 98 if (error) { 99 lockdestroy(&fmp->dm_lock); 100 FREE(fmp, M_DEVFS); 101 return (error); 102 } 103 VOP_UNLOCK(rvp, 0, p); 104 105 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 106 bcopy("devfs", mp->mnt_stat.f_mntfromname, sizeof("devfs")); 107 (void)devfs_statfs(mp, &mp->mnt_stat, p); 108 109 return (0); 110 } 111 112 static int 113 devfs_unmount(mp, mntflags, p) 114 struct mount *mp; 115 int mntflags; 116 struct proc *p; 117 { 118 int error; 119 int flags = 0; 120 struct vnode *rootvp; 121 struct devfs_mount *fmp; 122 123 error = devfs_root(mp, &rootvp); 124 if (error) 125 return (error); 126 fmp = VFSTODEVFS(mp); 127 if (mntflags & MNT_FORCE) 128 flags |= FORCECLOSE; 129 if (rootvp->v_usecount > 2) { 130 vrele(rootvp); 131 return (EBUSY); 132 } 133 error = vflush(mp, rootvp, flags); 134 if (error) 135 return (error); 136 devfs_purge(fmp->dm_rootdir); 137 vput(rootvp); 138 vrele(rootvp); 139 vgone(rootvp); 140 mp->mnt_data = 0; 141 lockdestroy(&fmp->dm_lock); 142 free(fmp, M_DEVFS); 143 return 0; 144 } 145 146 /* Return locked reference to root. */ 147 148 static int 149 devfs_root(mp, vpp) 150 struct mount *mp; 151 struct vnode **vpp; 152 { 153 int error; 154 struct proc *p; 155 struct vnode *vp; 156 struct devfs_mount *dmp; 157 158 p = curproc; /* XXX */ 159 dmp = VFSTODEVFS(mp); 160 error = devfs_allocv(dmp->dm_rootdir, mp, &vp, p); 161 if (error) 162 return (error); 163 vp->v_flag |= VROOT; 164 *vpp = vp; 165 return (0); 166 } 167 168 static int 169 devfs_statfs(mp, sbp, p) 170 struct mount *mp; 171 struct statfs *sbp; 172 struct proc *p; 173 { 174 175 sbp->f_flags = 0; 176 sbp->f_bsize = DEV_BSIZE; 177 sbp->f_iosize = DEV_BSIZE; 178 sbp->f_blocks = 2; /* 1K to keep df happy */ 179 sbp->f_bfree = 0; 180 sbp->f_bavail = 0; 181 sbp->f_files = 0; 182 sbp->f_ffree = 0; 183 if (sbp != &mp->mnt_stat) { 184 sbp->f_type = mp->mnt_vfc->vfc_typenum; 185 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 186 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 187 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 188 } 189 return (0); 190 } 191 192 static struct vfsops devfs_vfsops = { 193 devfs_mount, 194 vfs_stdstart, 195 devfs_unmount, 196 devfs_root, 197 vfs_stdquotactl, 198 devfs_statfs, 199 vfs_stdsync, 200 vfs_stdvget, 201 vfs_stdfhtovp, 202 vfs_stdcheckexp, 203 vfs_stdvptofh, 204 vfs_stdinit, 205 vfs_stduninit, 206 vfs_stdextattrctl, 207 }; 208 209 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC); 210