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 #ifndef NODEVFS 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/kernel.h> 43 #include <sys/lock.h> 44 #include <sys/malloc.h> 45 #include <sys/mount.h> 46 #include <sys/proc.h> 47 #include <sys/socket.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 int devfs_mount __P((struct mount *mp, char *path, caddr_t data, 55 struct nameidata *ndp, struct thread *td)); 56 static int devfs_unmount __P((struct mount *mp, int mntflags, 57 struct thread *td)); 58 static int devfs_root __P((struct mount *mp, struct vnode **vpp)); 59 static int devfs_statfs __P((struct mount *mp, struct statfs *sbp, 60 struct thread *td)); 61 62 /* 63 * Mount the filesystem 64 */ 65 static int 66 devfs_mount(mp, path, data, ndp, td) 67 struct mount *mp; 68 char *path; 69 caddr_t data; 70 struct nameidata *ndp; 71 struct thread *td; 72 { 73 int error; 74 struct devfs_mount *fmp; 75 struct vnode *rvp; 76 77 error = 0; 78 /* 79 * XXX: flag changes. 80 */ 81 if (mp->mnt_flag & MNT_UPDATE) 82 return (EOPNOTSUPP); 83 84 MALLOC(fmp, struct devfs_mount *, sizeof(struct devfs_mount), 85 M_DEVFS, M_WAITOK | M_ZERO); 86 lockinit(&fmp->dm_lock, PVFS, "devfs", 0, LK_NOPAUSE); 87 88 mp->mnt_flag |= MNT_LOCAL; 89 mp->mnt_data = (qaddr_t) fmp; 90 vfs_getnewfsid(mp); 91 92 fmp->dm_inode = DEVFSINOMOUNT; 93 94 fmp->dm_rootdir = devfs_vmkdir("(root)", 6, NULL); 95 fmp->dm_rootdir->de_inode = 2; 96 fmp->dm_basedir = fmp->dm_rootdir; 97 98 error = devfs_root(mp, &rvp); 99 if (error) { 100 lockdestroy(&fmp->dm_lock); 101 FREE(fmp, M_DEVFS); 102 return (error); 103 } 104 VOP_UNLOCK(rvp, 0, td); 105 106 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 107 bcopy("devfs", mp->mnt_stat.f_mntfromname, sizeof("devfs")); 108 (void)devfs_statfs(mp, &mp->mnt_stat, td); 109 110 return (0); 111 } 112 113 static int 114 devfs_unmount(mp, mntflags, td) 115 struct mount *mp; 116 int mntflags; 117 struct thread *td; 118 { 119 int error; 120 int flags = 0; 121 struct devfs_mount *fmp; 122 123 fmp = VFSTODEVFS(mp); 124 if (mntflags & MNT_FORCE) 125 flags |= FORCECLOSE; 126 /* There is 1 extra root vnode reference from devfs_mount(). */ 127 error = vflush(mp, 1, flags); 128 if (error) 129 return (error); 130 devfs_purge(fmp->dm_rootdir); 131 mp->mnt_data = 0; 132 lockdestroy(&fmp->dm_lock); 133 free(fmp, M_DEVFS); 134 return 0; 135 } 136 137 /* Return locked reference to root. */ 138 139 static int 140 devfs_root(mp, vpp) 141 struct mount *mp; 142 struct vnode **vpp; 143 { 144 int error; 145 struct thread *td; 146 struct vnode *vp; 147 struct devfs_mount *dmp; 148 149 td = curthread; /* XXX */ 150 dmp = VFSTODEVFS(mp); 151 error = devfs_allocv(dmp->dm_rootdir, mp, &vp, td); 152 if (error) 153 return (error); 154 vp->v_flag |= VROOT; 155 *vpp = vp; 156 return (0); 157 } 158 159 static int 160 devfs_statfs(mp, sbp, td) 161 struct mount *mp; 162 struct statfs *sbp; 163 struct thread *td; 164 { 165 166 sbp->f_flags = 0; 167 sbp->f_bsize = DEV_BSIZE; 168 sbp->f_iosize = DEV_BSIZE; 169 sbp->f_blocks = 2; /* 1K to keep df happy */ 170 sbp->f_bfree = 0; 171 sbp->f_bavail = 0; 172 sbp->f_files = 0; 173 sbp->f_ffree = 0; 174 if (sbp != &mp->mnt_stat) { 175 sbp->f_type = mp->mnt_vfc->vfc_typenum; 176 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 177 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 178 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 179 } 180 return (0); 181 } 182 183 static struct vfsops devfs_vfsops = { 184 devfs_mount, 185 vfs_stdstart, 186 devfs_unmount, 187 devfs_root, 188 vfs_stdquotactl, 189 devfs_statfs, 190 vfs_stdsync, 191 vfs_stdvget, 192 vfs_stdfhtovp, 193 vfs_stdcheckexp, 194 vfs_stdvptofh, 195 vfs_stdinit, 196 vfs_stduninit, 197 vfs_stdextattrctl, 198 }; 199 200 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC); 201 #endif 202