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/lock.h> 41 #include <sys/malloc.h> 42 #include <sys/mount.h> 43 #include <sys/proc.h> 44 #include <sys/sx.h> 45 #include <sys/vnode.h> 46 #include <sys/limits.h> 47 48 #include <fs/devfs/devfs.h> 49 50 static struct unrhdr *devfs_unr; 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 if (devfs_unr == NULL) 70 devfs_unr = new_unrhdr(0, INT_MAX, NULL); 71 72 error = 0; 73 74 if (mp->mnt_flag & (MNT_UPDATE | MNT_ROOTFS)) 75 return (EOPNOTSUPP); 76 77 fmp = malloc(sizeof *fmp, M_DEVFS, M_WAITOK | M_ZERO); 78 fmp->dm_idx = alloc_unr(devfs_unr); 79 sx_init(&fmp->dm_lock, "devfsmount"); 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 = (void *) fmp; 88 vfs_getnewfsid(mp); 89 90 fmp->dm_rootdir = devfs_vmkdir(fmp, NULL, 0, NULL, DEVFS_ROOTINO); 91 92 error = devfs_root(mp, LK_EXCLUSIVE, &rvp, td); 93 if (error) { 94 sx_destroy(&fmp->dm_lock); 95 free_unr(devfs_unr, fmp->dm_idx); 96 free(fmp, M_DEVFS); 97 return (error); 98 } 99 100 VOP_UNLOCK(rvp, 0, td); 101 102 vfs_mountedfrom(mp, "devfs"); 103 104 return (0); 105 } 106 107 static int 108 devfs_unmount(struct mount *mp, int mntflags, struct thread *td) 109 { 110 int error; 111 int flags = 0; 112 struct devfs_mount *fmp; 113 114 fmp = VFSTODEVFS(mp); 115 /* There is 1 extra root vnode reference from devfs_mount(). */ 116 error = vflush(mp, 1, flags, td); 117 if (error) 118 return (error); 119 sx_xlock(&fmp->dm_lock); 120 devfs_cleanup(fmp); 121 devfs_rules_cleanup(fmp); 122 sx_xunlock(&fmp->dm_lock); 123 mp->mnt_data = NULL; 124 sx_destroy(&fmp->dm_lock); 125 free_unr(devfs_unr, fmp->dm_idx); 126 free(fmp, M_DEVFS); 127 return 0; 128 } 129 130 /* Return locked reference to root. */ 131 132 static int 133 devfs_root(struct mount *mp, int flags, struct vnode **vpp, struct thread *td) 134 { 135 int error; 136 struct vnode *vp; 137 struct devfs_mount *dmp; 138 139 dmp = VFSTODEVFS(mp); 140 error = devfs_allocv(dmp->dm_rootdir, mp, &vp, td); 141 if (error) 142 return (error); 143 vp->v_vflag |= VV_ROOT; 144 *vpp = vp; 145 return (0); 146 } 147 148 static int 149 devfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 150 { 151 152 sbp->f_flags = 0; 153 sbp->f_bsize = DEV_BSIZE; 154 sbp->f_iosize = DEV_BSIZE; 155 sbp->f_blocks = 2; /* 1K to keep df happy */ 156 sbp->f_bfree = 0; 157 sbp->f_bavail = 0; 158 sbp->f_files = 0; 159 sbp->f_ffree = 0; 160 return (0); 161 } 162 163 static struct vfsops devfs_vfsops = { 164 .vfs_mount = devfs_mount, 165 .vfs_root = devfs_root, 166 .vfs_statfs = devfs_statfs, 167 .vfs_unmount = devfs_unmount, 168 }; 169 170 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC); 171