procfs_vfsops.c revision 1.78
1 /* $NetBSD: procfs_vfsops.c,v 1.78 2008/04/29 18:18:09 ad 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 1.78 2008/04/29 18:18:09 ad 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> 99 100 #include <miscfs/genfs/genfs.h> 101 102 #include <miscfs/procfs/procfs.h> 103 104 #include <uvm/uvm_extern.h> /* for PAGE_SIZE */ 105 106 VFS_PROTOS(procfs); 107 108 /* 109 * VFS Operations. 110 * 111 * mount system call 112 */ 113 /* ARGSUSED */ 114 int 115 procfs_mount( 116 struct mount *mp, 117 const char *path, 118 void *data, 119 size_t *data_len) 120 { 121 struct lwp *l = curlwp; 122 struct procfsmount *pmnt; 123 struct procfs_args *args = data; 124 int error; 125 126 if (UIO_MX & (UIO_MX-1)) { 127 log(LOG_ERR, "procfs: invalid directory entry size"); 128 return (EINVAL); 129 } 130 131 if (mp->mnt_flag & MNT_GETARGS) { 132 if (*data_len < sizeof *args) 133 return EINVAL; 134 135 pmnt = VFSTOPROC(mp); 136 if (pmnt == NULL) 137 return EIO; 138 args->version = PROCFS_ARGSVERSION; 139 args->flags = pmnt->pmnt_flags; 140 *data_len = sizeof *args; 141 return 0; 142 } 143 144 if (mp->mnt_flag & MNT_UPDATE) 145 return (EOPNOTSUPP); 146 147 if (*data_len >= sizeof *args && args->version != PROCFS_ARGSVERSION) 148 return EINVAL; 149 150 pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount), 151 M_UFSMNT, M_WAITOK); /* XXX need new malloc type */ 152 153 mp->mnt_stat.f_namemax = MAXNAMLEN; 154 mp->mnt_flag |= MNT_LOCAL; 155 mp->mnt_data = pmnt; 156 vfs_getnewfsid(mp); 157 158 error = set_statvfs_info(path, UIO_USERSPACE, "procfs", UIO_SYSSPACE, 159 mp->mnt_op->vfs_name, mp, l); 160 pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp); 161 if (*data_len >= sizeof *args) 162 pmnt->pmnt_flags = args->flags; 163 else 164 pmnt->pmnt_flags = 0; 165 166 mp->mnt_iflag |= IMNT_MPSAFE; 167 return error; 168 } 169 170 /* 171 * unmount system call 172 */ 173 int 174 procfs_unmount(struct mount *mp, int mntflags) 175 { 176 int error; 177 int flags = 0; 178 179 if (mntflags & MNT_FORCE) 180 flags |= FORCECLOSE; 181 182 if ((error = vflush(mp, 0, flags)) != 0) 183 return (error); 184 185 exechook_disestablish(VFSTOPROC(mp)->pmnt_exechook); 186 187 free(mp->mnt_data, M_UFSMNT); 188 mp->mnt_data = 0; 189 190 return (0); 191 } 192 193 int 194 procfs_root(mp, vpp) 195 struct mount *mp; 196 struct vnode **vpp; 197 { 198 199 return (procfs_allocvp(mp, vpp, 0, PFSroot, -1, NULL)); 200 } 201 202 /* ARGSUSED */ 203 int 204 procfs_start(struct mount *mp, int flags) 205 { 206 207 return (0); 208 } 209 210 /* 211 * Get file system statistics. 212 */ 213 int 214 procfs_statvfs(struct mount *mp, struct statvfs *sbp) 215 { 216 217 sbp->f_bsize = PAGE_SIZE; 218 sbp->f_frsize = PAGE_SIZE; 219 sbp->f_iosize = PAGE_SIZE; 220 sbp->f_blocks = 1; /* avoid divide by zero in some df's */ 221 sbp->f_bfree = 0; 222 sbp->f_bavail = 0; 223 sbp->f_bresvd = 0; 224 sbp->f_files = maxproc; /* approx */ 225 sbp->f_ffree = maxproc - nprocs; /* approx */ 226 sbp->f_favail = maxproc - nprocs; /* approx */ 227 sbp->f_fresvd = 0; 228 copy_statvfs_info(sbp, mp); 229 return (0); 230 } 231 232 /*ARGSUSED*/ 233 int 234 procfs_sync( 235 struct mount *mp, 236 int waitfor, 237 kauth_cred_t uc) 238 { 239 240 return (0); 241 } 242 243 /*ARGSUSED*/ 244 int 245 procfs_vget(struct mount *mp, ino_t ino, 246 struct vnode **vpp) 247 { 248 return (EOPNOTSUPP); 249 } 250 251 void 252 procfs_init() 253 { 254 procfs_hashinit(); 255 } 256 257 void 258 procfs_reinit() 259 { 260 procfs_hashreinit(); 261 } 262 263 void 264 procfs_done() 265 { 266 procfs_hashdone(); 267 } 268 269 SYSCTL_SETUP(sysctl_vfs_procfs_setup, "sysctl vfs.procfs subtree setup") 270 { 271 272 sysctl_createv(clog, 0, NULL, NULL, 273 CTLFLAG_PERMANENT, 274 CTLTYPE_NODE, "vfs", NULL, 275 NULL, 0, NULL, 0, 276 CTL_VFS, CTL_EOL); 277 sysctl_createv(clog, 0, NULL, NULL, 278 CTLFLAG_PERMANENT, 279 CTLTYPE_NODE, "procfs", 280 SYSCTL_DESCR("Process file system"), 281 NULL, 0, NULL, 0, 282 CTL_VFS, 12, CTL_EOL); 283 /* 284 * XXX the "12" above could be dynamic, thereby eliminating 285 * one more instance of the "number to vfs" mapping problem, 286 * but "12" is the order as taken from sys/mount.h 287 */ 288 } 289 290 extern const struct vnodeopv_desc procfs_vnodeop_opv_desc; 291 292 const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = { 293 &procfs_vnodeop_opv_desc, 294 NULL, 295 }; 296 297 struct vfsops procfs_vfsops = { 298 MOUNT_PROCFS, 299 sizeof (struct procfs_args), 300 procfs_mount, 301 procfs_start, 302 procfs_unmount, 303 procfs_root, 304 (void *)eopnotsupp, /* vfs_quotactl */ 305 procfs_statvfs, 306 procfs_sync, 307 procfs_vget, 308 (void *)eopnotsupp, /* vfs_fhtovp */ 309 (void *)eopnotsupp, /* vfs_vptofh */ 310 procfs_init, 311 procfs_reinit, 312 procfs_done, 313 NULL, /* vfs_mountroot */ 314 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 315 vfs_stdextattrctl, 316 (void *)eopnotsupp, /* vfs_suspendctl */ 317 genfs_renamelock_enter, 318 genfs_renamelock_exit, 319 (void *)eopnotsupp, 320 procfs_vnodeopv_descs, 321 0, 322 { NULL, NULL }, 323 }; 324 VFS_ATTACH(procfs_vfsops); 325
Indexes created Mon Sep 29 21:09:56 GMT 2025