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 | 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 95 error = devfs_root(mp, &rvp); 96 if (error) { 97 lockdestroy(&fmp->dm_lock); 98 FREE(fmp, M_DEVFS); 99 return (error); 100 } 101 VOP_UNLOCK(rvp, 0, p); 102 103 if (path != NULL) { 104 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 105 } else { 106 strcpy(mp->mnt_stat.f_mntonname, "/"); 107 size = 1; 108 } 109 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 110 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 111 bcopy("devfs", mp->mnt_stat.f_mntfromname, sizeof("devfs")); 112 (void)devfs_statfs(mp, &mp->mnt_stat, p); 113 114 return (0); 115 } 116 117 static int 118 devfs_unmount(mp, mntflags, p) 119 struct mount *mp; 120 int mntflags; 121 struct proc *p; 122 { 123 int error; 124 int flags = 0; 125 struct vnode *rootvp; 126 struct devfs_mount *fmp; 127 128 error = devfs_root(mp, &rootvp); 129 if (error) 130 return (error); 131 fmp = VFSTODEVFS(mp); 132 if (mntflags & MNT_FORCE) 133 flags |= FORCECLOSE; 134 if (rootvp->v_usecount > 2) { 135 vrele(rootvp); 136 return (EBUSY); 137 } 138 error = vflush(mp, rootvp, flags); 139 if (error) 140 return (error); 141 devfs_purge(fmp->dm_rootdir); 142 vput(rootvp); 143 vrele(rootvp); 144 vgone(rootvp); 145 mp->mnt_data = 0; 146 lockdestroy(&fmp->dm_lock); 147 free(fmp, M_DEVFS); 148 return 0; 149 } 150 151 /* Return locked reference to root. */ 152 153 static int 154 devfs_root(mp, vpp) 155 struct mount *mp; 156 struct vnode **vpp; 157 { 158 int error; 159 struct proc *p; 160 struct vnode *vp; 161 struct devfs_mount *dmp; 162 163 p = curproc; /* XXX */ 164 dmp = VFSTODEVFS(mp); 165 error = devfs_allocv(dmp->dm_rootdir, mp, &vp, p); 166 if (error) 167 return (error); 168 vp->v_flag |= VROOT; 169 *vpp = vp; 170 return (0); 171 } 172 173 static int 174 devfs_statfs(mp, sbp, p) 175 struct mount *mp; 176 struct statfs *sbp; 177 struct proc *p; 178 { 179 180 sbp->f_flags = 0; 181 sbp->f_bsize = DEV_BSIZE; 182 sbp->f_iosize = DEV_BSIZE; 183 sbp->f_blocks = 2; /* 1K to keep df happy */ 184 sbp->f_bfree = 0; 185 sbp->f_bavail = 0; 186 sbp->f_files = 0; 187 sbp->f_ffree = 0; 188 if (sbp != &mp->mnt_stat) { 189 sbp->f_type = mp->mnt_vfc->vfc_typenum; 190 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 191 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 192 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 193 } 194 return (0); 195 } 196 197 static struct vfsops devfs_vfsops = { 198 devfs_mount, 199 vfs_stdstart, 200 devfs_unmount, 201 devfs_root, 202 vfs_stdquotactl, 203 devfs_statfs, 204 vfs_stdsync, 205 vfs_stdvget, 206 vfs_stdfhtovp, 207 vfs_stdcheckexp, 208 vfs_stdvptofh, 209 vfs_stdinit, 210 vfs_stduninit, 211 vfs_stdextattrctl, 212 }; 213 214 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC); 215