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 #include "opt_mac.h" 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/kernel.h> 43 #include <sys/lock.h> 44 #include <sys/mac.h> 45 #include <sys/malloc.h> 46 #include <sys/mount.h> 47 #include <sys/proc.h> 48 #include <sys/vnode.h> 49 50 #include <fs/devfs/devfs.h> 51 52 MALLOC_DEFINE(M_DEVFS, "DEVFS", "DEVFS data"); 53 54 static vfs_mount_t devfs_mount; 55 static vfs_unmount_t devfs_unmount; 56 static vfs_root_t devfs_root; 57 static vfs_statfs_t devfs_statfs; 58 59 /* 60 * Mount the filesystem 61 */ 62 static int 63 devfs_mount(struct mount *mp, struct thread *td) 64 { 65 int error; 66 struct devfs_mount *fmp; 67 struct vnode *rvp; 68 69 error = 0; 70 /* 71 * XXX: flag changes. 72 */ 73 if (mp->mnt_flag & MNT_UPDATE) 74 return (EOPNOTSUPP); 75 76 MALLOC(fmp, struct devfs_mount *, sizeof(struct devfs_mount), 77 M_DEVFS, M_WAITOK | M_ZERO); 78 MALLOC(fmp->dm_dirent, struct devfs_dirent **, 79 sizeof(struct devfs_dirent *) * NDEVFSINO, 80 M_DEVFS, M_WAITOK | M_ZERO); 81 lockinit(&fmp->dm_lock, PVFS, "devfs", 0, LK_NOPAUSE); 82 83 mp->mnt_flag |= MNT_LOCAL; 84 #ifdef MAC 85 mp->mnt_flag |= MNT_MULTILABEL; 86 #endif 87 fmp->dm_mount = mp; 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 #ifdef MAC 96 mac_create_devfs_directory(mp, "", 0, fmp->dm_rootdir); 97 #endif 98 fmp->dm_basedir = fmp->dm_rootdir; 99 devfs_rules_newmount(fmp, td); 100 101 error = devfs_root(mp, &rvp, td); 102 if (error) { 103 lockdestroy(&fmp->dm_lock); 104 FREE(fmp, M_DEVFS); 105 return (error); 106 } 107 VOP_UNLOCK(rvp, 0, td); 108 109 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 110 bcopy("devfs", mp->mnt_stat.f_mntfromname, sizeof("devfs")); 111 (void)devfs_statfs(mp, &mp->mnt_stat, td); 112 113 return (0); 114 } 115 116 static int 117 devfs_unmount(mp, mntflags, td) 118 struct mount *mp; 119 int mntflags; 120 struct thread *td; 121 { 122 int error; 123 int flags = 0; 124 struct devfs_mount *fmp; 125 126 fmp = VFSTODEVFS(mp); 127 if (mntflags & MNT_FORCE) 128 flags |= FORCECLOSE; 129 /* There is 1 extra root vnode reference from devfs_mount(). */ 130 error = vflush(mp, 1, flags, td); 131 if (error) 132 return (error); 133 devfs_purge(fmp->dm_rootdir); 134 mp->mnt_data = 0; 135 lockdestroy(&fmp->dm_lock); 136 free(fmp->dm_dirent, M_DEVFS); 137 free(fmp, M_DEVFS); 138 return 0; 139 } 140 141 /* Return locked reference to root. */ 142 143 static int 144 devfs_root(mp, vpp, td) 145 struct mount *mp; 146 struct vnode **vpp; 147 struct thread *td; 148 { 149 int error; 150 struct vnode *vp; 151 struct devfs_mount *dmp; 152 153 dmp = VFSTODEVFS(mp); 154 error = devfs_allocv(dmp->dm_rootdir, mp, &vp, td); 155 if (error) 156 return (error); 157 vp->v_vflag |= VV_ROOT; 158 *vpp = vp; 159 return (0); 160 } 161 162 static int 163 devfs_statfs(mp, sbp, td) 164 struct mount *mp; 165 struct statfs *sbp; 166 struct thread *td; 167 { 168 169 sbp->f_flags = 0; 170 sbp->f_bsize = DEV_BSIZE; 171 sbp->f_iosize = DEV_BSIZE; 172 sbp->f_blocks = 2; /* 1K to keep df happy */ 173 sbp->f_bfree = 0; 174 sbp->f_bavail = 0; 175 sbp->f_files = 0; 176 sbp->f_ffree = 0; 177 if (sbp != &mp->mnt_stat) { 178 sbp->f_type = mp->mnt_vfc->vfc_typenum; 179 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 180 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 181 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 182 } 183 return (0); 184 } 185 186 static struct vfsops devfs_vfsops = { 187 .vfs_mount = devfs_mount, 188 .vfs_root = devfs_root, 189 .vfs_statfs = devfs_statfs, 190 .vfs_unmount = devfs_unmount, 191 }; 192 193 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC); 194