procfs_vfsops.c revision 1.51
1 /* $NetBSD: procfs_vfsops.c,v 1.51 2003/12/04 19:38:24 atatat 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 1.51 2003/12/04 19:38:24 atatat 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/signalvar.h> 95 #include <sys/vnode.h> 96 #include <sys/malloc.h> 97 98 #include <miscfs/procfs/procfs.h> 99 100 #include <uvm/uvm_extern.h> /* for PAGE_SIZE */ 101 102 void procfs_init __P((void)); 103 void procfs_reinit __P((void)); 104 void procfs_done __P((void)); 105 int procfs_mount __P((struct mount *, const char *, void *, 106 struct nameidata *, struct proc *)); 107 int procfs_start __P((struct mount *, int, struct proc *)); 108 int procfs_unmount __P((struct mount *, int, struct proc *)); 109 int procfs_quotactl __P((struct mount *, int, uid_t, caddr_t, 110 struct proc *)); 111 int procfs_statfs __P((struct mount *, struct statfs *, struct proc *)); 112 int procfs_sync __P((struct mount *, int, struct ucred *, struct proc *)); 113 int procfs_vget __P((struct mount *, ino_t, struct vnode **)); 114 int procfs_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 115 int procfs_checkexp __P((struct mount *, struct mbuf *, int *, 116 struct ucred **)); 117 int procfs_vptofh __P((struct vnode *, struct fid *)); 118 /* 119 * VFS Operations. 120 * 121 * mount system call 122 */ 123 /* ARGSUSED */ 124 int 125 procfs_mount(mp, path, data, ndp, p) 126 struct mount *mp; 127 const char *path; 128 void *data; 129 struct nameidata *ndp; 130 struct proc *p; 131 { 132 struct procfsmount *pmnt; 133 struct procfs_args args; 134 int error; 135 136 if (UIO_MX & (UIO_MX-1)) { 137 log(LOG_ERR, "procfs: invalid directory entry size"); 138 return (EINVAL); 139 } 140 141 if (mp->mnt_flag & MNT_GETARGS) { 142 pmnt = VFSTOPROC(mp); 143 if (pmnt == NULL) 144 return EIO; 145 args.version = PROCFS_ARGSVERSION; 146 args.flags = pmnt->pmnt_flags; 147 return copyout(&args, data, sizeof(args)); 148 } 149 150 if (mp->mnt_flag & MNT_UPDATE) 151 return (EOPNOTSUPP); 152 153 if (data != NULL) { 154 error = copyin(data, &args, sizeof args); 155 if (error != 0) 156 return error; 157 158 if (args.version != PROCFS_ARGSVERSION) 159 return EINVAL; 160 } else 161 args.flags = 0; 162 163 mp->mnt_flag |= MNT_LOCAL; 164 pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount), 165 M_UFSMNT, M_WAITOK); /* XXX need new malloc type */ 166 167 mp->mnt_data = pmnt; 168 vfs_getnewfsid(mp); 169 170 error = set_statfs_info(path, UIO_USERSPACE, "procfs", UIO_SYSSPACE, 171 mp, p); 172 pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp); 173 pmnt->pmnt_flags = args.flags; 174 175 return error; 176 } 177 178 /* 179 * unmount system call 180 */ 181 int 182 procfs_unmount(mp, mntflags, p) 183 struct mount *mp; 184 int mntflags; 185 struct proc *p; 186 { 187 int error; 188 int flags = 0; 189 190 if (mntflags & MNT_FORCE) 191 flags |= FORCECLOSE; 192 193 if ((error = vflush(mp, 0, flags)) != 0) 194 return (error); 195 196 exechook_disestablish(VFSTOPROC(mp)->pmnt_exechook); 197 198 free(mp->mnt_data, M_UFSMNT); 199 mp->mnt_data = 0; 200 201 return (0); 202 } 203 204 int 205 procfs_root(mp, vpp) 206 struct mount *mp; 207 struct vnode **vpp; 208 { 209 210 return (procfs_allocvp(mp, vpp, 0, PFSroot, -1)); 211 } 212 213 /* ARGSUSED */ 214 int 215 procfs_start(mp, flags, p) 216 struct mount *mp; 217 int flags; 218 struct proc *p; 219 { 220 221 return (0); 222 } 223 224 /* 225 * Get file system statistics. 226 */ 227 int 228 procfs_statfs(mp, sbp, p) 229 struct mount *mp; 230 struct statfs *sbp; 231 struct proc *p; 232 { 233 234 sbp->f_bsize = PAGE_SIZE; 235 sbp->f_iosize = PAGE_SIZE; 236 sbp->f_blocks = 1; /* avoid divide by zero in some df's */ 237 sbp->f_bfree = 0; 238 sbp->f_bavail = 0; 239 sbp->f_files = maxproc; /* approx */ 240 sbp->f_ffree = maxproc - nprocs; /* approx */ 241 #ifdef COMPAT_09 242 sbp->f_type = 10; 243 #else 244 sbp->f_type = 0; 245 #endif 246 copy_statfs_info(sbp, mp); 247 return (0); 248 } 249 250 /*ARGSUSED*/ 251 int 252 procfs_quotactl(mp, cmds, uid, arg, p) 253 struct mount *mp; 254 int cmds; 255 uid_t uid; 256 caddr_t arg; 257 struct proc *p; 258 { 259 260 return (EOPNOTSUPP); 261 } 262 263 /*ARGSUSED*/ 264 int 265 procfs_sync(mp, waitfor, uc, p) 266 struct mount *mp; 267 int waitfor; 268 struct ucred *uc; 269 struct proc *p; 270 { 271 272 return (0); 273 } 274 275 /*ARGSUSED*/ 276 int 277 procfs_vget(mp, ino, vpp) 278 struct mount *mp; 279 ino_t ino; 280 struct vnode **vpp; 281 { 282 return (EOPNOTSUPP); 283 } 284 285 /*ARGSUSED*/ 286 int 287 procfs_fhtovp(mp, fhp, vpp) 288 struct mount *mp; 289 struct fid *fhp; 290 struct vnode **vpp; 291 { 292 293 return (EINVAL); 294 } 295 296 /*ARGSUSED*/ 297 int 298 procfs_checkexp(mp, mb, what, anon) 299 struct mount *mp; 300 struct mbuf *mb; 301 int *what; 302 struct ucred **anon; 303 { 304 305 return (EINVAL); 306 } 307 308 /*ARGSUSED*/ 309 int 310 procfs_vptofh(vp, fhp) 311 struct vnode *vp; 312 struct fid *fhp; 313 { 314 315 return (EINVAL); 316 } 317 318 void 319 procfs_init() 320 { 321 procfs_hashinit(); 322 } 323 324 void 325 procfs_reinit() 326 { 327 procfs_hashreinit(); 328 } 329 330 void 331 procfs_done() 332 { 333 procfs_hashdone(); 334 } 335 336 SYSCTL_SETUP(sysctl_vfs_procfs_setup, "sysctl vfs.procfs subtree setup") 337 { 338 339 sysctl_createv(SYSCTL_PERMANENT, 340 CTLTYPE_NODE, "vfs", NULL, 341 NULL, 0, NULL, 0, 342 CTL_VFS, CTL_EOL); 343 sysctl_createv(SYSCTL_PERMANENT, 344 CTLTYPE_NODE, "procfs", NULL, 345 NULL, 0, NULL, 0, 346 CTL_VFS, 12, CTL_EOL); 347 /* 348 * XXX the "12" above could be dynamic, thereby eliminating 349 * one more instance of the "number to vfs" mapping problem, 350 * but "12" is the order as taken from sys/mount.h 351 */ 352 } 353 354 extern const struct vnodeopv_desc procfs_vnodeop_opv_desc; 355 356 const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = { 357 &procfs_vnodeop_opv_desc, 358 NULL, 359 }; 360 361 struct vfsops procfs_vfsops = { 362 MOUNT_PROCFS, 363 procfs_mount, 364 procfs_start, 365 procfs_unmount, 366 procfs_root, 367 procfs_quotactl, 368 procfs_statfs, 369 procfs_sync, 370 procfs_vget, 371 procfs_fhtovp, 372 procfs_vptofh, 373 procfs_init, 374 procfs_reinit, 375 procfs_done, 376 NULL, 377 NULL, /* vfs_mountroot */ 378 procfs_checkexp, 379 procfs_vnodeopv_descs, 380 }; 381
Indexes created Mon Sep 29 21:09:56 GMT 2025