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/vnode.h> 48 49 #include <fs/devfs/devfs.h> 50 51 MALLOC_DEFINE(M_DEVFS, "DEVFS", "DEVFS data"); 52 53 static int devfs_mount(struct mount *mp, struct nameidata *ndp, 54 struct thread *td); 55 static int devfs_unmount(struct mount *mp, int mntflags, 56 struct thread *td); 57 static int devfs_root(struct mount *mp, struct vnode **vpp); 58 static int devfs_statfs(struct mount *mp, struct statfs *sbp, 59 struct thread *td); 60 61 /* 62 * Mount the filesystem 63 */ 64 static int 65 devfs_mount(mp, ndp, td) 66 struct mount *mp; 67 struct nameidata *ndp; 68 struct thread *td; 69 { 70 int error; 71 struct devfs_mount *fmp; 72 struct vnode *rvp; 73 74 error = 0; 75 /* 76 * XXX: flag changes. 77 */ 78 if (mp->mnt_flag & MNT_UPDATE) 79 return (EOPNOTSUPP); 80 81 MALLOC(fmp, struct devfs_mount *, sizeof(struct devfs_mount), 82 M_DEVFS, M_WAITOK | M_ZERO); 83 lockinit(&fmp->dm_lock, PVFS, "devfs", 0, LK_NOPAUSE); 84 85 mp->mnt_flag |= MNT_LOCAL; 86 mp->mnt_data = (qaddr_t) fmp; 87 vfs_getnewfsid(mp); 88 89 fmp->dm_inode = DEVFSINOMOUNT; 90 91 fmp->dm_rootdir = devfs_vmkdir("(root)", 6, NULL); 92 fmp->dm_rootdir->de_inode = 2; 93 fmp->dm_basedir = fmp->dm_rootdir; 94 devfs_rules_newmount(fmp, td); 95 96 error = devfs_root(mp, &rvp); 97 if (error) { 98 lockdestroy(&fmp->dm_lock); 99 FREE(fmp, M_DEVFS); 100 return (error); 101 } 102 VOP_UNLOCK(rvp, 0, td); 103 104 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 105 bcopy("devfs", mp->mnt_stat.f_mntfromname, sizeof("devfs")); 106 (void)devfs_statfs(mp, &mp->mnt_stat, td); 107 108 return (0); 109 } 110 111 static int 112 devfs_unmount(mp, mntflags, td) 113 struct mount *mp; 114 int mntflags; 115 struct thread *td; 116 { 117 int error; 118 int flags = 0; 119 struct devfs_mount *fmp; 120 121 fmp = VFSTODEVFS(mp); 122 if (mntflags & MNT_FORCE) 123 flags |= FORCECLOSE; 124 /* There is 1 extra root vnode reference from devfs_mount(). */ 125 error = vflush(mp, 1, flags); 126 if (error) 127 return (error); 128 devfs_purge(fmp->dm_rootdir); 129 mp->mnt_data = 0; 130 lockdestroy(&fmp->dm_lock); 131 free(fmp, M_DEVFS); 132 return 0; 133 } 134 135 /* Return locked reference to root. */ 136 137 static int 138 devfs_root(mp, vpp) 139 struct mount *mp; 140 struct vnode **vpp; 141 { 142 int error; 143 struct thread *td; 144 struct vnode *vp; 145 struct devfs_mount *dmp; 146 147 td = curthread; /* XXX */ 148 dmp = VFSTODEVFS(mp); 149 error = devfs_allocv(dmp->dm_rootdir, mp, &vp, td); 150 if (error) 151 return (error); 152 vp->v_flag |= VROOT; 153 *vpp = vp; 154 return (0); 155 } 156 157 static int 158 devfs_statfs(mp, sbp, td) 159 struct mount *mp; 160 struct statfs *sbp; 161 struct thread *td; 162 { 163 164 sbp->f_flags = 0; 165 sbp->f_bsize = DEV_BSIZE; 166 sbp->f_iosize = DEV_BSIZE; 167 sbp->f_blocks = 2; /* 1K to keep df happy */ 168 sbp->f_bfree = 0; 169 sbp->f_bavail = 0; 170 sbp->f_files = 0; 171 sbp->f_ffree = 0; 172 if (sbp != &mp->mnt_stat) { 173 sbp->f_type = mp->mnt_vfc->vfc_typenum; 174 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 175 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 176 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 177 } 178 return (0); 179 } 180 181 static struct vfsops devfs_vfsops = { 182 NULL, 183 vfs_stdstart, 184 devfs_unmount, 185 devfs_root, 186 vfs_stdquotactl, 187 devfs_statfs, 188 vfs_stdsync, 189 vfs_stdvget, 190 vfs_stdfhtovp, 191 vfs_stdcheckexp, 192 vfs_stdvptofh, 193 vfs_stdinit, 194 vfs_stduninit, 195 vfs_stdextattrctl, 196 devfs_mount, 197 }; 198 199 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC); 200 #endif 201