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/vnode.h> 43 #include <sys/mount.h> 44 #include <sys/malloc.h> 45 46 #include <fs/devfs/devfs.h> 47 48 MALLOC_DEFINE(M_DEVFS, "DEVFS", "DEVFS data"); 49 50 static int devfs_mount __P((struct mount *mp, char *path, caddr_t data, 51 struct nameidata *ndp, struct proc *p)); 52 static int devfs_unmount __P((struct mount *mp, int mntflags, 53 struct proc *p)); 54 static int devfs_root __P((struct mount *mp, struct vnode **vpp)); 55 static int devfs_statfs __P((struct mount *mp, struct statfs *sbp, 56 struct proc *p)); 57 58 /* 59 * Mount the filesystem 60 */ 61 static int 62 devfs_mount(mp, path, data, ndp, p) 63 struct mount *mp; 64 char *path; 65 caddr_t data; 66 struct nameidata *ndp; 67 struct proc *p; 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 lockinit(&fmp->dm_lock, PVFS, "devfs", 0, LK_NOPAUSE); 83 84 mp->mnt_flag |= MNT_LOCAL; 85 mp->mnt_data = (qaddr_t) fmp; 86 vfs_getnewfsid(mp); 87 88 fmp->dm_inode = DEVFSINOMOUNT; 89 90 fmp->dm_rootdir = devfs_vmkdir("(root)", 6, NULL); 91 fmp->dm_rootdir->de_inode = 2; 92 fmp->dm_basedir = fmp->dm_rootdir; 93 94 error = devfs_root(mp, &rvp); 95 if (error) { 96 lockdestroy(&fmp->dm_lock); 97 FREE(fmp, M_DEVFS); 98 return (error); 99 } 100 VOP_UNLOCK(rvp, 0, p); 101 102 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 103 bcopy("devfs", mp->mnt_stat.f_mntfromname, sizeof("devfs")); 104 (void)devfs_statfs(mp, &mp->mnt_stat, p); 105 106 return (0); 107 } 108 109 static int 110 devfs_unmount(mp, mntflags, p) 111 struct mount *mp; 112 int mntflags; 113 struct proc *p; 114 { 115 int error; 116 int flags = 0; 117 struct vnode *rootvp; 118 struct devfs_mount *fmp; 119 120 error = devfs_root(mp, &rootvp); 121 if (error) 122 return (error); 123 fmp = VFSTODEVFS(mp); 124 if (mntflags & MNT_FORCE) 125 flags |= FORCECLOSE; 126 if (rootvp->v_usecount > 2) { 127 vrele(rootvp); 128 return (EBUSY); 129 } 130 error = vflush(mp, rootvp, flags); 131 if (error) 132 return (error); 133 devfs_purge(fmp->dm_rootdir); 134 vput(rootvp); 135 vrele(rootvp); 136 vgone(rootvp); 137 mp->mnt_data = 0; 138 lockdestroy(&fmp->dm_lock); 139 free(fmp, M_DEVFS); 140 return 0; 141 } 142 143 /* Return locked reference to root. */ 144 145 static int 146 devfs_root(mp, vpp) 147 struct mount *mp; 148 struct vnode **vpp; 149 { 150 int error; 151 struct proc *p; 152 struct vnode *vp; 153 struct devfs_mount *dmp; 154 155 p = curproc; /* XXX */ 156 dmp = VFSTODEVFS(mp); 157 error = devfs_allocv(dmp->dm_rootdir, mp, &vp, p); 158 if (error) 159 return (error); 160 vp->v_flag |= VROOT; 161 *vpp = vp; 162 return (0); 163 } 164 165 static int 166 devfs_statfs(mp, sbp, p) 167 struct mount *mp; 168 struct statfs *sbp; 169 struct proc *p; 170 { 171 172 sbp->f_flags = 0; 173 sbp->f_bsize = DEV_BSIZE; 174 sbp->f_iosize = DEV_BSIZE; 175 sbp->f_blocks = 2; /* 1K to keep df happy */ 176 sbp->f_bfree = 0; 177 sbp->f_bavail = 0; 178 sbp->f_files = 0; 179 sbp->f_ffree = 0; 180 if (sbp != &mp->mnt_stat) { 181 sbp->f_type = mp->mnt_vfc->vfc_typenum; 182 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 183 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 184 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 185 } 186 return (0); 187 } 188 189 static struct vfsops devfs_vfsops = { 190 devfs_mount, 191 vfs_stdstart, 192 devfs_unmount, 193 devfs_root, 194 vfs_stdquotactl, 195 devfs_statfs, 196 vfs_stdsync, 197 vfs_stdvget, 198 vfs_stdfhtovp, 199 vfs_stdcheckexp, 200 vfs_stdvptofh, 201 vfs_stdinit, 202 vfs_stduninit, 203 vfs_stdextattrctl, 204 }; 205 206 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC); 207