procfs_vfsops.c revision 1.70.6.3
1 /* $NetBSD: procfs_vfsops.c,v 1.70.6.3 2007/10/25 19:43:12 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 1.70.6.3 2007/10/25 19:43:12 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/procfs/procfs.h> 101 102 #include <uvm/uvm_extern.h> /* for PAGE_SIZE */ 103 104 VFS_PROTOS(procfs); 105 106 /* 107 * VFS Operations. 108 * 109 * mount system call 110 */ 111 /* ARGSUSED */ 112 int 113 procfs_mount( 114 struct mount *mp, 115 const char *path, 116 void *data, 117 size_t *data_len, 118 struct lwp *l 119 ) 120 { 121 struct procfsmount *pmnt; 122 struct procfs_args *args = data; 123 int error; 124 125 if (UIO_MX & (UIO_MX-1)) { 126 log(LOG_ERR, "procfs: invalid directory entry size"); 127 return (EINVAL); 128 } 129 130 if (mp->mnt_flag & MNT_GETARGS) { 131 if (*data_len < sizeof *args) 132 return EINVAL; 133 134 pmnt = VFSTOPROC(mp); 135 if (pmnt == NULL) 136 return EIO; 137 args->version = PROCFS_ARGSVERSION; 138 args->flags = pmnt->pmnt_flags; 139 *data_len = sizeof *args; 140 return 0; 141 } 142 143 if (mp->mnt_flag & MNT_UPDATE) 144 return (EOPNOTSUPP); 145 146 if (*data_len >= sizeof *args && args->version != PROCFS_ARGSVERSION) 147 return EINVAL; 148 149 pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount), 150 M_UFSMNT, M_WAITOK); /* XXX need new malloc type */ 151 152 mp->mnt_stat.f_namemax = MAXNAMLEN; 153 mp->mnt_flag |= MNT_LOCAL; 154 mp->mnt_data = pmnt; 155 vfs_getnewfsid(mp); 156 157 error = set_statvfs_info(path, UIO_USERSPACE, "procfs", UIO_SYSSPACE, 158 mp->mnt_op->vfs_name, mp, l); 159 pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp); 160 if (*data_len >= sizeof *args) 161 pmnt->pmnt_flags = args->flags; 162 else 163 pmnt->pmnt_flags = 0; 164 165 mp->mnt_iflag |= IMNT_MPSAFE; 166 return error; 167 } 168 169 /* 170 * unmount system call 171 */ 172 int 173 procfs_unmount(struct mount *mp, int mntflags, struct lwp *l) 174 { 175 int error; 176 int flags = 0; 177 178 if (mntflags & MNT_FORCE) 179 flags |= FORCECLOSE; 180 181 if ((error = vflush(mp, 0, flags)) != 0) 182 return (error); 183 184 exechook_disestablish(VFSTOPROC(mp)->pmnt_exechook); 185 186 free(mp->mnt_data, M_UFSMNT); 187 mp->mnt_data = 0; 188 189 return (0); 190 } 191 192 int 193 procfs_root(mp, vpp) 194 struct mount *mp; 195 struct vnode **vpp; 196 { 197 198 return (procfs_allocvp(mp, vpp, 0, PFSroot, -1, NULL)); 199 } 200 201 /* ARGSUSED */ 202 int 203 procfs_start(struct mount *mp, int flags, 204 struct lwp *l) 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, struct lwp *l) 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_quotactl( 235 struct mount *mp, 236 int cmds, 237 uid_t uid, 238 void *arg, 239 struct lwp *l 240 ) 241 { 242 243 return (EOPNOTSUPP); 244 } 245 246 /*ARGSUSED*/ 247 int 248 procfs_sync( 249 struct mount *mp, 250 int waitfor, 251 kauth_cred_t uc, 252 struct lwp *l 253 ) 254 { 255 256 return (0); 257 } 258 259 /*ARGSUSED*/ 260 int 261 procfs_vget(struct mount *mp, ino_t ino, 262 struct vnode **vpp) 263 { 264 return (EOPNOTSUPP); 265 } 266 267 void 268 procfs_init() 269 { 270 procfs_hashinit(); 271 } 272 273 void 274 procfs_reinit() 275 { 276 procfs_hashreinit(); 277 } 278 279 void 280 procfs_done() 281 { 282 procfs_hashdone(); 283 } 284 285 SYSCTL_SETUP(sysctl_vfs_procfs_setup, "sysctl vfs.procfs subtree setup") 286 { 287 288 sysctl_createv(clog, 0, NULL, NULL, 289 CTLFLAG_PERMANENT, 290 CTLTYPE_NODE, "vfs", NULL, 291 NULL, 0, NULL, 0, 292 CTL_VFS, CTL_EOL); 293 sysctl_createv(clog, 0, NULL, NULL, 294 CTLFLAG_PERMANENT, 295 CTLTYPE_NODE, "procfs", 296 SYSCTL_DESCR("Process file system"), 297 NULL, 0, NULL, 0, 298 CTL_VFS, 12, CTL_EOL); 299 /* 300 * XXX the "12" above could be dynamic, thereby eliminating 301 * one more instance of the "number to vfs" mapping problem, 302 * but "12" is the order as taken from sys/mount.h 303 */ 304 } 305 306 extern const struct vnodeopv_desc procfs_vnodeop_opv_desc; 307 308 const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = { 309 &procfs_vnodeop_opv_desc, 310 NULL, 311 }; 312 313 struct vfsops procfs_vfsops = { 314 MOUNT_PROCFS, 315 sizeof (struct procfs_args), 316 procfs_mount, 317 procfs_start, 318 procfs_unmount, 319 procfs_root, 320 procfs_quotactl, 321 procfs_statvfs, 322 procfs_sync, 323 procfs_vget, 324 (void *)eopnotsupp, /* vfs_fhtovp */ 325 (void *)eopnotsupp, /* vfs_vptofh */ 326 procfs_init, 327 procfs_reinit, 328 procfs_done, 329 NULL, /* vfs_mountroot */ 330 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 331 vfs_stdextattrctl, 332 (void *)eopnotsupp, /* vfs_suspendctl */ 333 procfs_vnodeopv_descs, 334 0, 335 { NULL, NULL }, 336 }; 337 VFS_ATTACH(procfs_vfsops); 338
Indexes created Tue Sep 30 07:10:03 GMT 2025