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. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95 38 * 39 * $FreeBSD: src/sys/miscfs/procfs/procfs_vfsops.c,v 1.32.2.1 2001/10/15 20:42:01 des Exp $ 40 * $DragonFly: src/sys/vfs/procfs/procfs_vfsops.c,v 1.17 2007/09/03 17:06:24 dillon Exp $ 41 */ 42 43 /* 44 * procfs VFS interface 45 */ 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/kernel.h> 50 #include <sys/proc.h> 51 #include <sys/mount.h> 52 #include <sys/vnode.h> 53 #include <vfs/procfs/procfs.h> 54 55 extern struct vop_ops procfs_vnode_vops; 56 57 static int procfs_mount (struct mount *mp, char *path, caddr_t data, 58 struct ucred *cred); 59 static int procfs_statfs (struct mount *mp, struct statfs *sbp, 60 struct ucred *cred); 61 static int procfs_unmount (struct mount *mp, int mntflags); 62 63 /* 64 * VFS Operations. 65 * 66 * mount system call 67 */ 68 /* ARGSUSED */ 69 static int 70 procfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 71 { 72 size_t size; 73 int error; 74 75 if (mp->mnt_flag & MNT_UPDATE) 76 return (EOPNOTSUPP); 77 78 if (mp->mnt_vfc->vfc_refcount == 1 && (error = at_exit(procfs_exit))) { 79 kprintf("procfs: cannot register procfs_exit with at_exit\n"); 80 return(error); 81 } 82 83 mp->mnt_flag |= MNT_LOCAL; 84 mp->mnt_kern_flag |= MNTK_NOSTKMNT; 85 mp->mnt_data = 0; 86 vfs_getnewfsid(mp); 87 88 size = sizeof("procfs") - 1; 89 bcopy("procfs", mp->mnt_stat.f_mntfromname, size); 90 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 91 procfs_statfs(mp, &mp->mnt_stat, cred); 92 vfs_add_vnodeops(mp, &procfs_vnode_vops, &mp->mnt_vn_norm_ops); 93 94 return (0); 95 } 96 97 /* 98 * unmount system call 99 */ 100 static int 101 procfs_unmount(struct mount *mp, int mntflags) 102 { 103 int error; 104 int flags = 0; 105 106 if (mntflags & MNT_FORCE) 107 flags |= FORCECLOSE; 108 109 error = vflush(mp, 0, flags); 110 if (error) 111 return (error); 112 113 if (mp->mnt_vfc->vfc_refcount == 1) 114 rm_at_exit(procfs_exit); 115 116 return (0); 117 } 118 119 /* 120 * Sets *vpp to the root procfs vnode, referenced and exclusively locked. 121 */ 122 int 123 procfs_root(struct mount *mp, struct vnode **vpp) 124 { 125 return (procfs_allocvp(mp, vpp, 0, Proot)); 126 } 127 128 /* 129 * Get file system statistics. 130 */ 131 static int 132 procfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 133 { 134 sbp->f_bsize = PAGE_SIZE; 135 sbp->f_iosize = PAGE_SIZE; 136 sbp->f_blocks = 1; /* avoid divide by zero in some df's */ 137 sbp->f_bfree = 0; 138 sbp->f_bavail = 0; 139 sbp->f_files = maxproc; /* approx */ 140 sbp->f_ffree = maxproc - nprocs; /* approx */ 141 142 if (sbp != &mp->mnt_stat) { 143 sbp->f_type = mp->mnt_vfc->vfc_typenum; 144 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 145 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 146 } 147 148 return (0); 149 } 150 151 static struct vfsops procfs_vfsops = { 152 .vfs_mount = procfs_mount, 153 .vfs_unmount = procfs_unmount, 154 .vfs_root = procfs_root, 155 .vfs_statfs = procfs_statfs, 156 .vfs_sync = vfs_stdsync 157 }; 158 159 VFS_SET(procfs_vfsops, procfs, VFCF_SYNTHETIC); 160 MODULE_VERSION(procfs, 1); 161