1 /* $NetBSD: procfs_vfsops.c,v 1.58 2004/09/13 19:19:45 jdolecek Exp $ */ 2 3 /* 4 * Copyright (c) 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed 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. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95 35 */ 36 37 /* 38 * Copyright (c) 1993 Jan-Simon Pendry 39 * 40 * This code is derived from software contributed to Berkeley by 41 * Jan-Simon Pendry. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 * 71 * @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95 72 */ 73 74 /* 75 * procfs VFS interface 76 */ 77 78 #include <sys/cdefs.h> 79 __KERNEL_RCSID(0, "$NetBSD: procfs_vfsops.c,v 1.58 2004/09/13 19:19:45 jdolecek Exp $"); 80 81 #if defined(_KERNEL_OPT) 82 #include "opt_compat_netbsd.h" 83 #endif 84 85 #include <sys/param.h> 86 #include <sys/time.h> 87 #include <sys/kernel.h> 88 #include <sys/systm.h> 89 #include <sys/sysctl.h> 90 #include <sys/proc.h> 91 #include <sys/buf.h> 92 #include <sys/syslog.h> 93 #include <sys/mount.h> 94 #include <sys/dirent.h> 95 #include <sys/signalvar.h> 96 #include <sys/vnode.h> 97 #include <sys/malloc.h> 98 99 #include <miscfs/procfs/procfs.h> 100 101 #include <uvm/uvm_extern.h> /* for PAGE_SIZE */ 102 103 void procfs_init __P((void)); 104 void procfs_reinit __P((void)); 105 void procfs_done __P((void)); 106 int procfs_mount __P((struct mount *, const char *, void *, 107 struct nameidata *, struct proc *)); 108 int procfs_start __P((struct mount *, int, struct proc *)); 109 int procfs_unmount __P((struct mount *, int, struct proc *)); 110 int procfs_quotactl __P((struct mount *, int, uid_t, void *, 111 struct proc *)); 112 int procfs_statvfs __P((struct mount *, struct statvfs *, struct proc *)); 113 int procfs_sync __P((struct mount *, int, struct ucred *, struct proc *)); 114 int procfs_vget __P((struct mount *, ino_t, struct vnode **)); 115 int procfs_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 116 int procfs_checkexp __P((struct mount *, struct mbuf *, int *, 117 struct ucred **)); 118 int procfs_vptofh __P((struct vnode *, struct fid *)); 119 120 /* 121 * VFS Operations. 122 * 123 * mount system call 124 */ 125 /* ARGSUSED */ 126 int 127 procfs_mount(mp, path, data, ndp, p) 128 struct mount *mp; 129 const char *path; 130 void *data; 131 struct nameidata *ndp; 132 struct proc *p; 133 { 134 struct procfsmount *pmnt; 135 struct procfs_args args; 136 int error; 137 138 if (UIO_MX & (UIO_MX-1)) { 139 log(LOG_ERR, "procfs: invalid directory entry size"); 140 return (EINVAL); 141 } 142 143 if (mp->mnt_flag & MNT_GETARGS) { 144 pmnt = VFSTOPROC(mp); 145 if (pmnt == NULL) 146 return EIO; 147 args.version = PROCFS_ARGSVERSION; 148 args.flags = pmnt->pmnt_flags; 149 return copyout(&args, data, sizeof(args)); 150 } 151 152 if (mp->mnt_flag & MNT_UPDATE) 153 return (EOPNOTSUPP); 154 155 if (data != NULL) { 156 error = copyin(data, &args, sizeof args); 157 if (error != 0) 158 return error; 159 160 if (args.version != PROCFS_ARGSVERSION) 161 return EINVAL; 162 } else 163 args.flags = 0; 164 165 pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount), 166 M_UFSMNT, M_WAITOK); /* XXX need new malloc type */ 167 168 mp->mnt_stat.f_namemax = MAXNAMLEN; 169 mp->mnt_flag |= MNT_LOCAL; 170 mp->mnt_data = pmnt; 171 vfs_getnewfsid(mp); 172 173 error = set_statvfs_info(path, UIO_USERSPACE, "procfs", UIO_SYSSPACE, 174 mp, p); 175 pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp); 176 pmnt->pmnt_flags = args.flags; 177 178 return error; 179 } 180 181 /* 182 * unmount system call 183 */ 184 int 185 procfs_unmount(mp, mntflags, p) 186 struct mount *mp; 187 int mntflags; 188 struct proc *p; 189 { 190 int error; 191 int flags = 0; 192 193 if (mntflags & MNT_FORCE) 194 flags |= FORCECLOSE; 195 196 if ((error = vflush(mp, 0, flags)) != 0) 197 return (error); 198 199 exechook_disestablish(VFSTOPROC(mp)->pmnt_exechook); 200 201 free(mp->mnt_data, M_UFSMNT); 202 mp->mnt_data = 0; 203 204 return (0); 205 } 206 207 int 208 procfs_root(mp, vpp) 209 struct mount *mp; 210 struct vnode **vpp; 211 { 212 213 return (procfs_allocvp(mp, vpp, 0, PFSroot, -1)); 214 } 215 216 /* ARGSUSED */ 217 int 218 procfs_start(mp, flags, p) 219 struct mount *mp; 220 int flags; 221 struct proc *p; 222 { 223 224 return (0); 225 } 226 227 /* 228 * Get file system statistics. 229 */ 230 int 231 procfs_statvfs(mp, sbp, p) 232 struct mount *mp; 233 struct statvfs *sbp; 234 struct proc *p; 235 { 236 237 sbp->f_bsize = PAGE_SIZE; 238 sbp->f_frsize = PAGE_SIZE; 239 sbp->f_iosize = PAGE_SIZE; 240 sbp->f_blocks = 1; /* avoid divide by zero in some df's */ 241 sbp->f_bfree = 0; 242 sbp->f_bavail = 0; 243 sbp->f_bresvd = 0; 244 sbp->f_files = maxproc; /* approx */ 245 sbp->f_ffree = maxproc - nprocs; /* approx */ 246 sbp->f_favail = maxproc - nprocs; /* approx */ 247 sbp->f_fresvd = 0; 248 copy_statvfs_info(sbp, mp); 249 return (0); 250 } 251 252 /*ARGSUSED*/ 253 int 254 procfs_quotactl(mp, cmds, uid, arg, p) 255 struct mount *mp; 256 int cmds; 257 uid_t uid; 258 void *arg; 259 struct proc *p; 260 { 261 262 return (EOPNOTSUPP); 263 } 264 265 /*ARGSUSED*/ 266 int 267 procfs_sync(mp, waitfor, uc, p) 268 struct mount *mp; 269 int waitfor; 270 struct ucred *uc; 271 struct proc *p; 272 { 273 274 return (0); 275 } 276 277 /*ARGSUSED*/ 278 int 279 procfs_vget(mp, ino, vpp) 280 struct mount *mp; 281 ino_t ino; 282 struct vnode **vpp; 283 { 284 return (EOPNOTSUPP); 285 } 286 287 /*ARGSUSED*/ 288 int 289 procfs_fhtovp(mp, fhp, vpp) 290 struct mount *mp; 291 struct fid *fhp; 292 struct vnode **vpp; 293 { 294 295 return (EINVAL); 296 } 297 298 /*ARGSUSED*/ 299 int 300 procfs_checkexp(mp, mb, what, anon) 301 struct mount *mp; 302 struct mbuf *mb; 303 int *what; 304 struct ucred **anon; 305 { 306 307 return (EINVAL); 308 } 309 310 /*ARGSUSED*/ 311 int 312 procfs_vptofh(vp, fhp) 313 struct vnode *vp; 314 struct fid *fhp; 315 { 316 317 return (EINVAL); 318 } 319 320 void 321 procfs_init() 322 { 323 procfs_hashinit(); 324 } 325 326 void 327 procfs_reinit() 328 { 329 procfs_hashreinit(); 330 } 331 332 void 333 procfs_done() 334 { 335 procfs_hashdone(); 336 } 337 338 SYSCTL_SETUP(sysctl_vfs_procfs_setup, "sysctl vfs.procfs subtree setup") 339 { 340 341 sysctl_createv(clog, 0, NULL, NULL, 342 CTLFLAG_PERMANENT, 343 CTLTYPE_NODE, "vfs", NULL, 344 NULL, 0, NULL, 0, 345 CTL_VFS, CTL_EOL); 346 sysctl_createv(clog, 0, NULL, NULL, 347 CTLFLAG_PERMANENT, 348 CTLTYPE_NODE, "procfs", 349 SYSCTL_DESCR("Process file system"), 350 NULL, 0, NULL, 0, 351 CTL_VFS, 12, CTL_EOL); 352 /* 353 * XXX the "12" above could be dynamic, thereby eliminating 354 * one more instance of the "number to vfs" mapping problem, 355 * but "12" is the order as taken from sys/mount.h 356 */ 357 } 358 359 extern const struct vnodeopv_desc procfs_vnodeop_opv_desc; 360 361 const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = { 362 &procfs_vnodeop_opv_desc, 363 NULL, 364 }; 365 366 struct vfsops procfs_vfsops = { 367 MOUNT_PROCFS, 368 procfs_mount, 369 procfs_start, 370 procfs_unmount, 371 procfs_root, 372 procfs_quotactl, 373 procfs_statvfs, 374 procfs_sync, 375 procfs_vget, 376 procfs_fhtovp, 377 procfs_vptofh, 378 procfs_init, 379 procfs_reinit, 380 procfs_done, 381 NULL, 382 NULL, /* vfs_mountroot */ 383 procfs_checkexp, 384 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 385 procfs_vnodeopv_descs, 386 }; 387