1 /* 2 * Copyright (c) 1993 Jan-Simon Pendry 3 * Copyright (c) 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Jan-Simon Pendry. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95 34 * 35 * $FreeBSD: src/sys/miscfs/procfs/procfs_vfsops.c,v 1.32.2.1 2001/10/15 20:42:01 des Exp $ 36 */ 37 38 /* 39 * procfs VFS interface 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/kernel.h> 45 #include <sys/proc.h> 46 #include <sys/mount.h> 47 #include <sys/vnode.h> 48 #include <vfs/procfs/procfs.h> 49 50 extern struct vop_ops procfs_vnode_vops; 51 52 static int procfs_mount (struct mount *mp, char *path, caddr_t data, 53 struct ucred *cred); 54 static int procfs_statfs (struct mount *mp, struct statfs *sbp, 55 struct ucred *cred); 56 static int procfs_unmount (struct mount *mp, int mntflags); 57 58 /* 59 * VFS Operations. 60 * 61 * mount system call 62 */ 63 /* ARGSUSED */ 64 static int 65 procfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 66 { 67 size_t size; 68 int error; 69 70 if (mp->mnt_flag & MNT_UPDATE) 71 return (EOPNOTSUPP); 72 73 if (mp->mnt_vfc->vfc_refcount == 1 && (error = at_exit(procfs_exit))) { 74 kprintf("procfs: cannot register procfs_exit with at_exit\n"); 75 return(error); 76 } 77 78 mp->mnt_flag |= MNT_LOCAL; 79 mp->mnt_kern_flag |= MNTK_NOSTKMNT; 80 mp->mnt_kern_flag |= MNTK_QUICKHALT; /* no teardown needed on halt */ 81 mp->mnt_data = NULL; 82 vfs_getnewfsid(mp); 83 84 size = sizeof("procfs") - 1; 85 bcopy("procfs", mp->mnt_stat.f_mntfromname, size); 86 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 87 procfs_statfs(mp, &mp->mnt_stat, cred); 88 vfs_add_vnodeops(mp, &procfs_vnode_vops, &mp->mnt_vn_norm_ops); 89 90 return (0); 91 } 92 93 /* 94 * unmount system call 95 */ 96 static int 97 procfs_unmount(struct mount *mp, int mntflags) 98 { 99 int error; 100 int flags = 0; 101 102 if (mntflags & MNT_FORCE) 103 flags |= FORCECLOSE; 104 105 error = vflush(mp, 0, flags); 106 if (error) 107 return (error); 108 109 if (mp->mnt_vfc->vfc_refcount == 1) 110 rm_at_exit(procfs_exit); 111 112 return (0); 113 } 114 115 /* 116 * Sets *vpp to the root procfs vnode, referenced and exclusively locked. 117 */ 118 int 119 procfs_root(struct mount *mp, struct vnode **vpp) 120 { 121 return (procfs_allocvp(mp, vpp, 0, Proot)); 122 } 123 124 /* 125 * Get file system statistics. 126 */ 127 static int 128 procfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 129 { 130 sbp->f_bsize = PAGE_SIZE; 131 sbp->f_iosize = PAGE_SIZE; 132 sbp->f_blocks = 1; /* avoid divide by zero in some df's */ 133 sbp->f_bfree = 0; 134 sbp->f_bavail = 0; 135 sbp->f_files = maxproc; /* approx */ 136 sbp->f_ffree = maxproc - nprocs; /* approx */ 137 138 if (sbp != &mp->mnt_stat) { 139 sbp->f_type = mp->mnt_vfc->vfc_typenum; 140 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 141 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 142 } 143 144 return (0); 145 } 146 147 static struct vfsops procfs_vfsops = { 148 .vfs_flags = 0, 149 .vfs_mount = procfs_mount, 150 .vfs_unmount = procfs_unmount, 151 .vfs_root = procfs_root, 152 .vfs_statfs = procfs_statfs, 153 }; 154 155 VFS_SET(procfs_vfsops, procfs, VFCF_SYNTHETIC | VFCF_MPSAFE); 156 MODULE_VERSION(procfs, 1); 157