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/proc.h> 43 #include <sys/vnode.h> 44 #include <sys/mount.h> 45 #include <sys/malloc.h> 46 47 #include <fs/devfs/devfs.h> 48 49 MALLOC_DEFINE(M_DEVFS, "DEVFS", "DEVFS data"); 50 51 static int devfs_mount __P((struct mount *mp, char *path, caddr_t data, 52 struct nameidata *ndp, struct proc *p)); 53 static int devfs_unmount __P((struct mount *mp, int mntflags, 54 struct proc *p)); 55 static int devfs_root __P((struct mount *mp, struct vnode **vpp)); 56 static int devfs_statfs __P((struct mount *mp, struct statfs *sbp, 57 struct proc *p)); 58 59 /* 60 * Mount the filesystem 61 */ 62 static int 63 devfs_mount(mp, path, data, ndp, p) 64 struct mount *mp; 65 char *path; 66 caddr_t data; 67 struct nameidata *ndp; 68 struct proc *p; 69 { 70 int error; 71 size_t size; 72 struct devfs_mount *fmp; 73 struct vnode *rvp; 74 75 error = 0; 76 /* 77 * XXX: flag changes. 78 */ 79 if (mp->mnt_flag & MNT_UPDATE) 80 return (EOPNOTSUPP); 81 82 MALLOC(fmp, struct devfs_mount *, sizeof(struct devfs_mount), 83 M_DEVFS, M_WAITOK); 84 bzero(fmp, sizeof(*fmp)); 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 if (path != NULL) { 106 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 107 } else { 108 strcpy(mp->mnt_stat.f_mntonname, "/"); 109 size = 1; 110 } 111 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 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, p); 115 116 return (0); 117 } 118 119 static int 120 devfs_unmount(mp, mntflags, p) 121 struct mount *mp; 122 int mntflags; 123 struct proc *p; 124 { 125 int error; 126 int flags = 0; 127 struct vnode *rootvp; 128 struct devfs_mount *fmp; 129 130 error = devfs_root(mp, &rootvp); 131 if (error) 132 return (error); 133 fmp = VFSTODEVFS(mp); 134 if (mntflags & MNT_FORCE) 135 flags |= FORCECLOSE; 136 if (rootvp->v_usecount > 2) { 137 vrele(rootvp); 138 return (EBUSY); 139 } 140 error = vflush(mp, rootvp, flags); 141 if (error) 142 return (error); 143 devfs_purge(fmp->dm_rootdir); 144 vput(rootvp); 145 vrele(rootvp); 146 vgone(rootvp); 147 mp->mnt_data = 0; 148 lockdestroy(&fmp->dm_lock); 149 free(fmp, M_DEVFS); 150 return 0; 151 } 152 153 /* Return locked reference to root. */ 154 155 static int 156 devfs_root(mp, vpp) 157 struct mount *mp; 158 struct vnode **vpp; 159 { 160 int error; 161 struct proc *p; 162 struct vnode *vp; 163 struct devfs_mount *dmp; 164 165 p = curproc; /* XXX */ 166 dmp = VFSTODEVFS(mp); 167 error = devfs_allocv(dmp->dm_rootdir, mp, &vp, p); 168 if (error) 169 return (error); 170 vp->v_flag |= VROOT; 171 *vpp = vp; 172 return (0); 173 } 174 175 static int 176 devfs_statfs(mp, sbp, p) 177 struct mount *mp; 178 struct statfs *sbp; 179 struct proc *p; 180 { 181 182 sbp->f_flags = 0; 183 sbp->f_bsize = DEV_BSIZE; 184 sbp->f_iosize = DEV_BSIZE; 185 sbp->f_blocks = 2; /* 1K to keep df happy */ 186 sbp->f_bfree = 0; 187 sbp->f_bavail = 0; 188 sbp->f_files = 0; 189 sbp->f_ffree = 0; 190 if (sbp != &mp->mnt_stat) { 191 sbp->f_type = mp->mnt_vfc->vfc_typenum; 192 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 193 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 194 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 195 } 196 return (0); 197 } 198 199 static struct vfsops devfs_vfsops = { 200 devfs_mount, 201 vfs_stdstart, 202 devfs_unmount, 203 devfs_root, 204 vfs_stdquotactl, 205 devfs_statfs, 206 vfs_stdsync, 207 vfs_stdvget, 208 vfs_stdfhtovp, 209 vfs_stdcheckexp, 210 vfs_stdvptofh, 211 vfs_stdinit, 212 vfs_stduninit, 213 vfs_stdextattrctl, 214 }; 215 216 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC); 217