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 if (mp->mnt_flag & (MNT_UPDATE | MNT_ROOTFS)) 72 return (EOPNOTSUPP); 73 74 MALLOC(fmp, struct devfs_mount *, sizeof(struct devfs_mount), 75 M_DEVFS, M_WAITOK | M_ZERO); 76 MALLOC(fmp->dm_dirent, struct devfs_dirent **, 77 sizeof(struct devfs_dirent *) * NDEVFSINO, 78 M_DEVFS, M_WAITOK | M_ZERO); 79 lockinit(&fmp->dm_lock, PVFS, "devfs", 0, 0); 80 81 mp->mnt_flag |= MNT_LOCAL; 82 mp->mnt_kern_flag |= MNTK_MPSAFE; 83 #ifdef MAC 84 mp->mnt_flag |= MNT_MULTILABEL; 85 #endif 86 fmp->dm_mount = mp; 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 #ifdef MAC 95 mac_create_devfs_directory(mp, "", 0, fmp->dm_rootdir); 96 #endif 97 fmp->dm_basedir = fmp->dm_rootdir; 98 devfs_rules_newmount(fmp, td); 99 100 error = devfs_root(mp, LK_EXCLUSIVE, &rvp, td); 101 if (error) { 102 lockdestroy(&fmp->dm_lock); 103 FREE(fmp, M_DEVFS); 104 return (error); 105 } 106 107 VOP_UNLOCK(rvp, 0, td); 108 109 vfs_mountedfrom(mp, "devfs"); 110 111 return (0); 112 } 113 114 static int 115 devfs_unmount(mp, mntflags, td) 116 struct mount *mp; 117 int mntflags; 118 struct thread *td; 119 { 120 int error; 121 int flags = 0; 122 struct devfs_mount *fmp; 123 124 fmp = VFSTODEVFS(mp); 125 /* There is 1 extra root vnode reference from devfs_mount(). */ 126 error = vflush(mp, 1, flags, td); 127 if (error) 128 return (error); 129 devfs_purge(fmp->dm_rootdir); 130 mp->mnt_data = 0; 131 lockdestroy(&fmp->dm_lock); 132 free(fmp->dm_dirent, M_DEVFS); 133 free(fmp, M_DEVFS); 134 return 0; 135 } 136 137 /* Return locked reference to root. */ 138 139 static int 140 devfs_root(mp, flags, vpp, td) 141 struct mount *mp; 142 int flags; 143 struct vnode **vpp; 144 struct thread *td; 145 { 146 int error; 147 struct vnode *vp; 148 struct devfs_mount *dmp; 149 150 dmp = VFSTODEVFS(mp); 151 error = devfs_allocv(dmp->dm_rootdir, mp, &vp, td); 152 if (error) 153 return (error); 154 vp->v_vflag |= VV_ROOT; 155 *vpp = vp; 156 return (0); 157 } 158 159 static int 160 devfs_statfs(mp, sbp, td) 161 struct mount *mp; 162 struct statfs *sbp; 163 struct thread *td; 164 { 165 166 sbp->f_flags = 0; 167 sbp->f_bsize = DEV_BSIZE; 168 sbp->f_iosize = DEV_BSIZE; 169 sbp->f_blocks = 2; /* 1K to keep df happy */ 170 sbp->f_bfree = 0; 171 sbp->f_bavail = 0; 172 sbp->f_files = 0; 173 sbp->f_ffree = 0; 174 return (0); 175 } 176 177 static struct vfsops devfs_vfsops = { 178 .vfs_mount = devfs_mount, 179 .vfs_root = devfs_root, 180 .vfs_statfs = devfs_statfs, 181 .vfs_unmount = devfs_unmount, 182 }; 183 184 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC); 185