procfs_vfsops.c revision 1.79
1 /* $NetBSD: procfs_vfsops.c,v 1.79 2008/05/10 02:26:10 rumble 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 1.79 2008/05/10 02:26:10 rumble 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 /* 112 * VFS Operations. 113 * 114 * mount system call 115 */ 116 /* ARGSUSED */ 117 int 118 procfs_mount( 119 struct mount *mp, 120 const char *path, 121 void *data, 122 size_t *data_len) 123 { 124 struct lwp *l = curlwp; 125 struct procfsmount *pmnt; 126 struct procfs_args *args = data; 127 int error; 128 129 if (UIO_MX & (UIO_MX-1)) { 130 log(LOG_ERR, "procfs: invalid directory entry size"); 131 return (EINVAL); 132 } 133 134 if (mp->mnt_flag & MNT_GETARGS) { 135 if (*data_len < sizeof *args) 136 return EINVAL; 137 138 pmnt = VFSTOPROC(mp); 139 if (pmnt == NULL) 140 return EIO; 141 args->version = PROCFS_ARGSVERSION; 142 args->flags = pmnt->pmnt_flags; 143 *data_len = sizeof *args; 144 return 0; 145 } 146 147 if (mp->mnt_flag & MNT_UPDATE) 148 return (EOPNOTSUPP); 149 150 if (*data_len >= sizeof *args && args->version != PROCFS_ARGSVERSION) 151 return EINVAL; 152 153 pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount), 154 M_UFSMNT, M_WAITOK); /* XXX need new malloc type */ 155 156 mp->mnt_stat.f_namemax = MAXNAMLEN; 157 mp->mnt_flag |= MNT_LOCAL; 158 mp->mnt_data = pmnt; 159 vfs_getnewfsid(mp); 160 161 error = set_statvfs_info(path, UIO_USERSPACE, "procfs", UIO_SYSSPACE, 162 mp->mnt_op->vfs_name, mp, l); 163 pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp); 164 if (*data_len >= sizeof *args) 165 pmnt->pmnt_flags = args->flags; 166 else 167 pmnt->pmnt_flags = 0; 168 169 mp->mnt_iflag |= IMNT_MPSAFE; 170 return error; 171 } 172 173 /* 174 * unmount system call 175 */ 176 int 177 procfs_unmount(struct mount *mp, int mntflags) 178 { 179 int error; 180 int flags = 0; 181 182 if (mntflags & MNT_FORCE) 183 flags |= FORCECLOSE; 184 185 if ((error = vflush(mp, 0, flags)) != 0) 186 return (error); 187 188 exechook_disestablish(VFSTOPROC(mp)->pmnt_exechook); 189 190 free(mp->mnt_data, M_UFSMNT); 191 mp->mnt_data = 0; 192 193 return (0); 194 } 195 196 int 197 procfs_root(mp, vpp) 198 struct mount *mp; 199 struct vnode **vpp; 200 { 201 202 return (procfs_allocvp(mp, vpp, 0, PFSroot, -1, NULL)); 203 } 204 205 /* ARGSUSED */ 206 int 207 procfs_start(struct mount *mp, int flags) 208 { 209 210 return (0); 211 } 212 213 /* 214 * Get file system statistics. 215 */ 216 int 217 procfs_statvfs(struct mount *mp, struct statvfs *sbp) 218 { 219 220 sbp->f_bsize = PAGE_SIZE; 221 sbp->f_frsize = PAGE_SIZE; 222 sbp->f_iosize = PAGE_SIZE; 223 sbp->f_blocks = 1; /* avoid divide by zero in some df's */ 224 sbp->f_bfree = 0; 225 sbp->f_bavail = 0; 226 sbp->f_bresvd = 0; 227 sbp->f_files = maxproc; /* approx */ 228 sbp->f_ffree = maxproc - nprocs; /* approx */ 229 sbp->f_favail = maxproc - nprocs; /* approx */ 230 sbp->f_fresvd = 0; 231 copy_statvfs_info(sbp, mp); 232 return (0); 233 } 234 235 /*ARGSUSED*/ 236 int 237 procfs_sync( 238 struct mount *mp, 239 int waitfor, 240 kauth_cred_t uc) 241 { 242 243 return (0); 244 } 245 246 /*ARGSUSED*/ 247 int 248 procfs_vget(struct mount *mp, ino_t ino, 249 struct vnode **vpp) 250 { 251 return (EOPNOTSUPP); 252 } 253 254 void 255 procfs_init() 256 { 257 procfs_hashinit(); 258 } 259 260 void 261 procfs_reinit() 262 { 263 procfs_hashreinit(); 264 } 265 266 void 267 procfs_done() 268 { 269 procfs_hashdone(); 270 } 271 272 SYSCTL_SETUP(sysctl_vfs_procfs_setup, "sysctl vfs.procfs subtree setup") 273 { 274 275 sysctl_createv(clog, 0, NULL, NULL, 276 CTLFLAG_PERMANENT, 277 CTLTYPE_NODE, "vfs", NULL, 278 NULL, 0, NULL, 0, 279 CTL_VFS, CTL_EOL); 280 sysctl_createv(clog, 0, NULL, NULL, 281 CTLFLAG_PERMANENT, 282 CTLTYPE_NODE, "procfs", 283 SYSCTL_DESCR("Process file system"), 284 NULL, 0, NULL, 0, 285 CTL_VFS, 12, CTL_EOL); 286 /* 287 * XXX the "12" above could be dynamic, thereby eliminating 288 * one more instance of the "number to vfs" mapping problem, 289 * but "12" is the order as taken from sys/mount.h 290 */ 291 } 292 293 extern const struct vnodeopv_desc procfs_vnodeop_opv_desc; 294 295 const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = { 296 &procfs_vnodeop_opv_desc, 297 NULL, 298 }; 299 300 struct vfsops procfs_vfsops = { 301 MOUNT_PROCFS, 302 sizeof (struct procfs_args), 303 procfs_mount, 304 procfs_start, 305 procfs_unmount, 306 procfs_root, 307 (void *)eopnotsupp, /* vfs_quotactl */ 308 procfs_statvfs, 309 procfs_sync, 310 procfs_vget, 311 (void *)eopnotsupp, /* vfs_fhtovp */ 312 (void *)eopnotsupp, /* vfs_vptofh */ 313 procfs_init, 314 procfs_reinit, 315 procfs_done, 316 NULL, /* vfs_mountroot */ 317 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 318 vfs_stdextattrctl, 319 (void *)eopnotsupp, /* vfs_suspendctl */ 320 genfs_renamelock_enter, 321 genfs_renamelock_exit, 322 (void *)eopnotsupp, 323 procfs_vnodeopv_descs, 324 0, 325 { NULL, NULL }, 326 }; 327 328 static int 329 procfs_modcmd(modcmd_t cmd, void *arg) 330 { 331 332 switch (cmd) { 333 case MODULE_CMD_INIT: 334 return vfs_attach(&procfs_vfsops); 335 case MODULE_CMD_FINI: 336 return vfs_detach(&procfs_vfsops); 337 default: 338 return ENOTTY; 339 } 340 } 341
Indexes created Mon Sep 29 21:09:56 GMT 2025