procfs_vfsops.c revision 1.81.16.1
1 /* $NetBSD: procfs_vfsops.c,v 1.81.16.1 2014/04/28 16:03:15 sborrill 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 1.81.16.1 2014/04/28 16:03:15 sborrill 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 #include <sys/kauth.h> 99 #include <sys/module.h> 100 101 #include <miscfs/genfs/genfs.h> 102 103 #include <miscfs/procfs/procfs.h> 104 105 #include <uvm/uvm_extern.h> /* for PAGE_SIZE */ 106 107 MODULE(MODULE_CLASS_VFS, procfs, NULL); 108 109 VFS_PROTOS(procfs); 110 111 static struct sysctllog *procfs_sysctl_log; 112 113 /* 114 * VFS Operations. 115 * 116 * mount system call 117 */ 118 /* ARGSUSED */ 119 int 120 procfs_mount( 121 struct mount *mp, 122 const char *path, 123 void *data, 124 size_t *data_len) 125 { 126 struct lwp *l = curlwp; 127 struct procfsmount *pmnt; 128 struct procfs_args *args = data; 129 int error; 130 131 if (args == NULL) 132 return EINVAL; 133 134 if (UIO_MX & (UIO_MX-1)) { 135 log(LOG_ERR, "procfs: invalid directory entry size"); 136 return (EINVAL); 137 } 138 139 if (mp->mnt_flag & MNT_GETARGS) { 140 if (*data_len < sizeof *args) 141 return EINVAL; 142 143 pmnt = VFSTOPROC(mp); 144 if (pmnt == NULL) 145 return EIO; 146 args->version = PROCFS_ARGSVERSION; 147 args->flags = pmnt->pmnt_flags; 148 *data_len = sizeof *args; 149 return 0; 150 } 151 152 if (mp->mnt_flag & MNT_UPDATE) 153 return (EOPNOTSUPP); 154 155 if (*data_len >= sizeof *args && args->version != PROCFS_ARGSVERSION) 156 return EINVAL; 157 158 pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount), 159 M_UFSMNT, M_WAITOK); /* XXX need new malloc type */ 160 161 mp->mnt_stat.f_namemax = MAXNAMLEN; 162 mp->mnt_flag |= MNT_LOCAL; 163 mp->mnt_data = pmnt; 164 vfs_getnewfsid(mp); 165 166 error = set_statvfs_info(path, UIO_USERSPACE, "procfs", UIO_SYSSPACE, 167 mp->mnt_op->vfs_name, mp, l); 168 pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp); 169 if (*data_len >= sizeof *args) 170 pmnt->pmnt_flags = args->flags; 171 else 172 pmnt->pmnt_flags = 0; 173 174 mp->mnt_iflag |= IMNT_MPSAFE; 175 return error; 176 } 177 178 /* 179 * unmount system call 180 */ 181 int 182 procfs_unmount(struct mount *mp, int mntflags) 183 { 184 int error; 185 int flags = 0; 186 187 if (mntflags & MNT_FORCE) 188 flags |= FORCECLOSE; 189 190 if ((error = vflush(mp, 0, flags)) != 0) 191 return (error); 192 193 exechook_disestablish(VFSTOPROC(mp)->pmnt_exechook); 194 195 free(mp->mnt_data, M_UFSMNT); 196 mp->mnt_data = NULL; 197 198 return (0); 199 } 200 201 int 202 procfs_root(mp, vpp) 203 struct mount *mp; 204 struct vnode **vpp; 205 { 206 207 return (procfs_allocvp(mp, vpp, 0, PFSroot, -1, NULL)); 208 } 209 210 /* ARGSUSED */ 211 int 212 procfs_start(struct mount *mp, int flags) 213 { 214 215 return (0); 216 } 217 218 /* 219 * Get file system statistics. 220 */ 221 int 222 procfs_statvfs(struct mount *mp, struct statvfs *sbp) 223 { 224 225 sbp->f_bsize = PAGE_SIZE; 226 sbp->f_frsize = PAGE_SIZE; 227 sbp->f_iosize = PAGE_SIZE; 228 sbp->f_blocks = 1; /* avoid divide by zero in some df's */ 229 sbp->f_bfree = 0; 230 sbp->f_bavail = 0; 231 sbp->f_bresvd = 0; 232 sbp->f_files = maxproc; /* approx */ 233 sbp->f_ffree = maxproc - nprocs; /* approx */ 234 sbp->f_favail = maxproc - nprocs; /* approx */ 235 sbp->f_fresvd = 0; 236 copy_statvfs_info(sbp, mp); 237 return (0); 238 } 239 240 /*ARGSUSED*/ 241 int 242 procfs_sync( 243 struct mount *mp, 244 int waitfor, 245 kauth_cred_t uc) 246 { 247 248 return (0); 249 } 250 251 /*ARGSUSED*/ 252 int 253 procfs_vget(struct mount *mp, ino_t ino, 254 struct vnode **vpp) 255 { 256 return (EOPNOTSUPP); 257 } 258 259 void 260 procfs_init() 261 { 262 procfs_hashinit(); 263 } 264 265 void 266 procfs_reinit() 267 { 268 procfs_hashreinit(); 269 } 270 271 void 272 procfs_done() 273 { 274 procfs_hashdone(); 275 } 276 277 extern const struct vnodeopv_desc procfs_vnodeop_opv_desc; 278 279 const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = { 280 &procfs_vnodeop_opv_desc, 281 NULL, 282 }; 283 284 struct vfsops procfs_vfsops = { 285 MOUNT_PROCFS, 286 sizeof (struct procfs_args), 287 procfs_mount, 288 procfs_start, 289 procfs_unmount, 290 procfs_root, 291 (void *)eopnotsupp, /* vfs_quotactl */ 292 procfs_statvfs, 293 procfs_sync, 294 procfs_vget, 295 (void *)eopnotsupp, /* vfs_fhtovp */ 296 (void *)eopnotsupp, /* vfs_vptofh */ 297 procfs_init, 298 procfs_reinit, 299 procfs_done, 300 NULL, /* vfs_mountroot */ 301 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 302 vfs_stdextattrctl, 303 (void *)eopnotsupp, /* vfs_suspendctl */ 304 genfs_renamelock_enter, 305 genfs_renamelock_exit, 306 (void *)eopnotsupp, 307 procfs_vnodeopv_descs, 308 0, 309 { NULL, NULL }, 310 }; 311 312 static int 313 procfs_modcmd(modcmd_t cmd, void *arg) 314 { 315 int error; 316 317 switch (cmd) { 318 case MODULE_CMD_INIT: 319 error = vfs_attach(&procfs_vfsops); 320 if (error != 0) 321 break; 322 sysctl_createv(&procfs_sysctl_log, 0, NULL, NULL, 323 CTLFLAG_PERMANENT, 324 CTLTYPE_NODE, "vfs", NULL, 325 NULL, 0, NULL, 0, 326 CTL_VFS, CTL_EOL); 327 sysctl_createv(&procfs_sysctl_log, 0, NULL, NULL, 328 CTLFLAG_PERMANENT, 329 CTLTYPE_NODE, "procfs", 330 SYSCTL_DESCR("Process file system"), 331 NULL, 0, NULL, 0, 332 CTL_VFS, 12, CTL_EOL); 333 /* 334 * XXX the "12" above could be dynamic, thereby eliminating 335 * one more instance of the "number to vfs" mapping problem, 336 * but "12" is the order as taken from sys/mount.h 337 */ 338 break; 339 case MODULE_CMD_FINI: 340 error = vfs_detach(&procfs_vfsops); 341 if (error != 0) 342 break; 343 sysctl_teardown(&procfs_sysctl_log); 344 break; 345 default: 346 error = ENOTTY; 347 break; 348 } 349 350 return (error); 351 } 352
Indexes created Mon Sep 29 21:09:56 GMT 2025