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 <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/proc.h> 41 #include <sys/vnode.h> 42 #include <sys/mount.h> 43 #include <sys/malloc.h> 44 #include <sys/eventhandler.h> 45 46 #define DEVFS_INTERN 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 u_int 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 86 mp->mnt_flag |= MNT_LOCAL; 87 mp->mnt_data = (qaddr_t) fmp; 88 vfs_getnewfsid(mp); 89 90 fmp->dm_inode = NDEVINO; 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 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 devfs_populate(fmp); 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 return (EBUSY); 137 devfs_purge(fmp->dm_rootdir); 138 error = vflush(mp, rootvp, flags); 139 if (error) 140 return (error); 141 vput(rootvp); 142 vrele(rootvp); 143 vgone(rootvp); 144 mp->mnt_data = 0; 145 free(fmp, M_DEVFS); 146 return 0; 147 } 148 149 /* Return locked reference to root. */ 150 151 static int 152 devfs_root(mp, vpp) 153 struct mount *mp; 154 struct vnode **vpp; 155 { 156 int error; 157 struct proc *p; 158 struct vnode *vp; 159 struct devfs_mount *dmp; 160 161 p = curproc; /* XXX */ 162 dmp = VFSTODEVFS(mp); 163 error = devfs_allocv(dmp->dm_rootdir, mp, &vp, p); 164 if (error) 165 return (error); 166 vp->v_flag |= VROOT; 167 *vpp = vp; 168 return (0); 169 } 170 171 static int 172 devfs_statfs(mp, sbp, p) 173 struct mount *mp; 174 struct statfs *sbp; 175 struct proc *p; 176 { 177 178 sbp->f_flags = 0; 179 sbp->f_bsize = DEV_BSIZE; 180 sbp->f_iosize = DEV_BSIZE; 181 sbp->f_blocks = 2; /* 1K to keep df happy */ 182 sbp->f_bfree = 0; 183 sbp->f_bavail = 0; 184 sbp->f_files = 0; 185 sbp->f_ffree = 0; 186 if (sbp != &mp->mnt_stat) { 187 sbp->f_type = mp->mnt_vfc->vfc_typenum; 188 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 189 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 190 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 191 } 192 return (0); 193 } 194 195 static struct vfsops devfs_vfsops = { 196 devfs_mount, 197 vfs_stdstart, 198 devfs_unmount, 199 devfs_root, 200 vfs_stdquotactl, 201 devfs_statfs, 202 vfs_stdsync, 203 vfs_stdvget, 204 vfs_stdfhtovp, 205 vfs_stdcheckexp, 206 vfs_stdvptofh, 207 vfs_stdinit, 208 vfs_stduninit, 209 vfs_stdextattrctl, 210 }; 211 212 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC); 213