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 size_t size; 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); 83 bzero(fmp, sizeof(*fmp)); 84 lockinit(&fmp->dm_lock, PVFS, "devfs", 0, LK_NOPAUSE); 85 86 mp->mnt_flag |= MNT_LOCAL; 87 mp->mnt_data = (qaddr_t) fmp; 88 vfs_getnewfsid(mp); 89 90 fmp->dm_inode = DEVFSINOMOUNT; 91 92 fmp->dm_rootdir = devfs_vmkdir("(root)", 6, NULL); 93 fmp->dm_rootdir->de_inode = 2; 94 fmp->dm_basedir = fmp->dm_rootdir; 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, p); 103 104 if (path != NULL) { 105 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 106 } else { 107 strcpy(mp->mnt_stat.f_mntonname, "/"); 108 size = 1; 109 } 110 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 111 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 112 bcopy("devfs", mp->mnt_stat.f_mntfromname, sizeof("devfs")); 113 (void)devfs_statfs(mp, &mp->mnt_stat, p); 114 115 return (0); 116 } 117 118 static int 119 devfs_unmount(mp, mntflags, p) 120 struct mount *mp; 121 int mntflags; 122 struct proc *p; 123 { 124 int error; 125 int flags = 0; 126 struct vnode *rootvp; 127 struct devfs_mount *fmp; 128 129 error = devfs_root(mp, &rootvp); 130 if (error) 131 return (error); 132 fmp = VFSTODEVFS(mp); 133 if (mntflags & MNT_FORCE) 134 flags |= FORCECLOSE; 135 if (rootvp->v_usecount > 2) { 136 vrele(rootvp); 137 return (EBUSY); 138 } 139 error = vflush(mp, rootvp, flags); 140 if (error) 141 return (error); 142 devfs_purge(fmp->dm_rootdir); 143 vput(rootvp); 144 vrele(rootvp); 145 vgone(rootvp); 146 mp->mnt_data = 0; 147 lockdestroy(&fmp->dm_lock); 148 free(fmp, M_DEVFS); 149 return 0; 150 } 151 152 /* Return locked reference to root. */ 153 154 static int 155 devfs_root(mp, vpp) 156 struct mount *mp; 157 struct vnode **vpp; 158 { 159 int error; 160 struct proc *p; 161 struct vnode *vp; 162 struct devfs_mount *dmp; 163 164 p = curproc; /* XXX */ 165 dmp = VFSTODEVFS(mp); 166 error = devfs_allocv(dmp->dm_rootdir, mp, &vp, p); 167 if (error) 168 return (error); 169 vp->v_flag |= VROOT; 170 *vpp = vp; 171 return (0); 172 } 173 174 static int 175 devfs_statfs(mp, sbp, p) 176 struct mount *mp; 177 struct statfs *sbp; 178 struct proc *p; 179 { 180 181 sbp->f_flags = 0; 182 sbp->f_bsize = DEV_BSIZE; 183 sbp->f_iosize = DEV_BSIZE; 184 sbp->f_blocks = 2; /* 1K to keep df happy */ 185 sbp->f_bfree = 0; 186 sbp->f_bavail = 0; 187 sbp->f_files = 0; 188 sbp->f_ffree = 0; 189 if (sbp != &mp->mnt_stat) { 190 sbp->f_type = mp->mnt_vfc->vfc_typenum; 191 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 192 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 193 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 194 } 195 return (0); 196 } 197 198 static struct vfsops devfs_vfsops = { 199 devfs_mount, 200 vfs_stdstart, 201 devfs_unmount, 202 devfs_root, 203 vfs_stdquotactl, 204 devfs_statfs, 205 vfs_stdsync, 206 vfs_stdvget, 207 vfs_stdfhtovp, 208 vfs_stdcheckexp, 209 vfs_stdvptofh, 210 vfs_stdinit, 211 vfs_stduninit, 212 vfs_stdextattrctl, 213 }; 214 215 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC); 216