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 * %sccs.include.redist.c% 10 * 11 * @(#)procfs_vfsops.c 8.4 (Berkeley) 01/21/94 12 * 13 * From: 14 * $Id: procfs_vfsops.c,v 3.1 1993/12/15 09:40:17 jsp Exp $ 15 */ 16 17 /* 18 * procfs VFS interface 19 */ 20 21 #include <sys/param.h> 22 #include <sys/time.h> 23 #include <sys/kernel.h> 24 #include <sys/proc.h> 25 #include <sys/buf.h> 26 #include <sys/syslog.h> 27 #include <sys/mount.h> 28 #include <sys/signalvar.h> 29 #include <sys/vnode.h> 30 #include <miscfs/procfs/procfs.h> 31 #include <vm/vm.h> /* for PAGE_SIZE */ 32 33 /* 34 * VFS Operations. 35 * 36 * mount system call 37 */ 38 /* ARGSUSED */ 39 procfs_mount(mp, path, data, ndp, p) 40 struct mount *mp; 41 char *path; 42 caddr_t data; 43 struct nameidata *ndp; 44 struct proc *p; 45 { 46 u_int size; 47 48 if (UIO_MX & (UIO_MX-1)) { 49 log(LOG_ERR, "procfs: invalid directory entry size"); 50 return (EINVAL); 51 } 52 53 if (mp->mnt_flag & MNT_UPDATE) 54 return (EOPNOTSUPP); 55 56 mp->mnt_flag |= MNT_LOCAL; 57 mp->mnt_data = 0; 58 getnewfsid(mp, MOUNT_PROCFS); 59 60 (void) copyinstr(path, (caddr_t)mp->mnt_stat.f_mntonname, MNAMELEN, &size); 61 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 62 63 size = sizeof("procfs") - 1; 64 bcopy("procfs", mp->mnt_stat.f_mntfromname, size); 65 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 66 67 return (0); 68 } 69 70 /* 71 * unmount system call 72 */ 73 procfs_unmount(mp, mntflags, p) 74 struct mount *mp; 75 int mntflags; 76 struct proc *p; 77 { 78 int error; 79 extern int doforce; 80 int flags = 0; 81 82 if (mntflags & MNT_FORCE) { 83 /* procfs can never be rootfs so don't check for it */ 84 if (!doforce) 85 return (EINVAL); 86 flags |= FORCECLOSE; 87 } 88 89 if (error = vflush(mp, 0, flags)) 90 return (error); 91 92 return (0); 93 } 94 95 procfs_root(mp, vpp) 96 struct mount *mp; 97 struct vnode **vpp; 98 { 99 struct pfsnode *pfs; 100 struct vnode *vp; 101 int error; 102 103 error = procfs_allocvp(mp, &vp, (pid_t) 0, Proot); 104 if (error) 105 return (error); 106 107 vp->v_type = VDIR; 108 vp->v_flag = VROOT; 109 pfs = VTOPFS(vp); 110 111 *vpp = vp; 112 return (0); 113 } 114 115 /* 116 */ 117 /* ARGSUSED */ 118 procfs_start(mp, flags, p) 119 struct mount *mp; 120 int flags; 121 struct proc *p; 122 { 123 124 return (0); 125 } 126 127 /* 128 * Get file system statistics. 129 */ 130 procfs_statfs(mp, sbp, p) 131 struct mount *mp; 132 struct statfs *sbp; 133 struct proc *p; 134 { 135 sbp->f_type = MOUNT_PROCFS; 136 sbp->f_bsize = PAGE_SIZE; 137 sbp->f_iosize = PAGE_SIZE; 138 sbp->f_blocks = 1; /* avoid divide by zero in some df's */ 139 sbp->f_bfree = 0; 140 sbp->f_bavail = 0; 141 sbp->f_files = maxproc; /* approx */ 142 sbp->f_ffree = maxproc - nprocs; /* approx */ 143 144 if (sbp != &mp->mnt_stat) { 145 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 146 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 147 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 148 } 149 150 return (0); 151 } 152 153 154 procfs_quotactl(mp, cmds, uid, arg, p) 155 struct mount *mp; 156 int cmds; 157 uid_t uid; 158 caddr_t arg; 159 struct proc *p; 160 { 161 162 return (EOPNOTSUPP); 163 } 164 165 procfs_sync(mp, waitfor) 166 struct mount *mp; 167 int waitfor; 168 { 169 170 return (0); 171 } 172 173 procfs_vget(mp, ino, vpp) 174 struct mount *mp; 175 ino_t ino; 176 struct vnode **vpp; 177 { 178 179 return (EOPNOTSUPP); 180 } 181 182 procfs_fhtovp(mp, fhp, vpp) 183 struct mount *mp; 184 struct fid *fhp; 185 struct vnode **vpp; 186 { 187 188 return (EINVAL); 189 } 190 191 procfs_vptofh(vp, fhp) 192 struct vnode *vp; 193 struct fid *fhp; 194 { 195 196 return EINVAL; 197 } 198 199 procfs_init() 200 { 201 202 return (0); 203 } 204 205 struct vfsops procfs_vfsops = { 206 procfs_mount, 207 procfs_start, 208 procfs_unmount, 209 procfs_root, 210 procfs_quotactl, 211 procfs_statfs, 212 procfs_sync, 213 procfs_vget, 214 procfs_fhtovp, 215 procfs_vptofh, 216 procfs_init, 217 }; 218