procfs_vfsops.c revision 1.48.2.2
1 /* $NetBSD: procfs_vfsops.c,v 1.48.2.2 2004/08/03 10:54:07 skrll 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 1.48.2.2 2004/08/03 10:54:07 skrll 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 lwp *)); 108 int procfs_start __P((struct mount *, int, struct lwp *)); 109 int procfs_unmount __P((struct mount *, int, struct lwp *)); 110 int procfs_quotactl __P((struct mount *, int, uid_t, void *, 111 struct lwp *)); 112 int procfs_statvfs __P((struct mount *, struct statvfs *, struct lwp *)); 113 int procfs_sync __P((struct mount *, int, struct ucred *, struct lwp *)); 114 int procfs_vget __P((struct mount *, ino_t, struct vnode **, struct lwp *)); 115 int procfs_fhtovp __P((struct mount *, struct fid *, struct vnode **, struct lwp *)); 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, l) 128 struct mount *mp; 129 const char *path; 130 void *data; 131 struct nameidata *ndp; 132 struct lwp *l; 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 mp->mnt_flag |= MNT_LOCAL; 166 pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount), 167 M_UFSMNT, M_WAITOK); /* XXX need new malloc type */ 168 169 mp->mnt_data = pmnt; 170 vfs_getnewfsid(mp); 171 172 error = set_statvfs_info(path, UIO_USERSPACE, "procfs", UIO_SYSSPACE, 173 mp, l); 174 pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp); 175 pmnt->pmnt_flags = args.flags; 176 177 return error; 178 } 179 180 /* 181 * unmount system call 182 */ 183 int 184 procfs_unmount(mp, mntflags, l) 185 struct mount *mp; 186 int mntflags; 187 struct lwp *l; 188 { 189 int error; 190 int flags = 0; 191 192 if (mntflags & MNT_FORCE) 193 flags |= FORCECLOSE; 194 195 if ((error = vflush(mp, 0, flags)) != 0) 196 return (error); 197 198 exechook_disestablish(VFSTOPROC(mp)->pmnt_exechook); 199 200 free(mp->mnt_data, M_UFSMNT); 201 mp->mnt_data = 0; 202 203 return (0); 204 } 205 206 int 207 procfs_root(mp, vpp, l) 208 struct mount *mp; 209 struct vnode **vpp; 210 struct lwp *l; 211 { 212 213 return (procfs_allocvp(mp, vpp, 0, PFSroot, -1)); 214 } 215 216 /* ARGSUSED */ 217 int 218 procfs_start(mp, flags, l) 219 struct mount *mp; 220 int flags; 221 struct lwp *l; 222 { 223 224 return (0); 225 } 226 227 /* 228 * Get file system statistics. 229 */ 230 int 231 procfs_statvfs(mp, sbp, l) 232 struct mount *mp; 233 struct statvfs *sbp; 234 struct lwp *l; 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 sbp->f_namemax = MAXNAMLEN; 249 copy_statvfs_info(sbp, mp); 250 return (0); 251 } 252 253 /*ARGSUSED*/ 254 int 255 procfs_quotactl(mp, cmds, uid, arg, l) 256 struct mount *mp; 257 int cmds; 258 uid_t uid; 259 void *arg; 260 struct lwp *l; 261 { 262 263 return (EOPNOTSUPP); 264 } 265 266 /*ARGSUSED*/ 267 int 268 procfs_sync(mp, waitfor, uc, l) 269 struct mount *mp; 270 int waitfor; 271 struct ucred *uc; 272 struct lwp *l; 273 { 274 275 return (0); 276 } 277 278 /*ARGSUSED*/ 279 int 280 procfs_vget(mp, ino, vpp, l) 281 struct mount *mp; 282 ino_t ino; 283 struct vnode **vpp; 284 struct lwp *l; 285 { 286 return (EOPNOTSUPP); 287 } 288 289 /*ARGSUSED*/ 290 int 291 procfs_fhtovp(mp, fhp, vpp, l) 292 struct mount *mp; 293 struct fid *fhp; 294 struct vnode **vpp; 295 struct lwp *l; 296 { 297 298 return (EINVAL); 299 } 300 301 /*ARGSUSED*/ 302 int 303 procfs_checkexp(mp, mb, what, anon) 304 struct mount *mp; 305 struct mbuf *mb; 306 int *what; 307 struct ucred **anon; 308 { 309 310 return (EINVAL); 311 } 312 313 /*ARGSUSED*/ 314 int 315 procfs_vptofh(vp, fhp) 316 struct vnode *vp; 317 struct fid *fhp; 318 { 319 320 return (EINVAL); 321 } 322 323 void 324 procfs_init() 325 { 326 procfs_hashinit(); 327 } 328 329 void 330 procfs_reinit() 331 { 332 procfs_hashreinit(); 333 } 334 335 void 336 procfs_done() 337 { 338 procfs_hashdone(); 339 } 340 341 SYSCTL_SETUP(sysctl_vfs_procfs_setup, "sysctl vfs.procfs subtree setup") 342 { 343 344 sysctl_createv(clog, 0, NULL, NULL, 345 CTLFLAG_PERMANENT, 346 CTLTYPE_NODE, "vfs", NULL, 347 NULL, 0, NULL, 0, 348 CTL_VFS, CTL_EOL); 349 sysctl_createv(clog, 0, NULL, NULL, 350 CTLFLAG_PERMANENT, 351 CTLTYPE_NODE, "procfs", 352 SYSCTL_DESCR("Process file system"), 353 NULL, 0, NULL, 0, 354 CTL_VFS, 12, CTL_EOL); 355 /* 356 * XXX the "12" above could be dynamic, thereby eliminating 357 * one more instance of the "number to vfs" mapping problem, 358 * but "12" is the order as taken from sys/mount.h 359 */ 360 } 361 362 extern const struct vnodeopv_desc procfs_vnodeop_opv_desc; 363 364 const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = { 365 &procfs_vnodeop_opv_desc, 366 NULL, 367 }; 368 369 struct vfsops procfs_vfsops = { 370 MOUNT_PROCFS, 371 procfs_mount, 372 procfs_start, 373 procfs_unmount, 374 procfs_root, 375 procfs_quotactl, 376 procfs_statvfs, 377 procfs_sync, 378 procfs_vget, 379 procfs_fhtovp, 380 procfs_vptofh, 381 procfs_init, 382 procfs_reinit, 383 procfs_done, 384 NULL, 385 NULL, /* vfs_mountroot */ 386 procfs_checkexp, 387 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 388 procfs_vnodeopv_descs, 389 }; 390
Indexes created Tue Sep 30 07:10:03 GMT 2025