procfs_vfsops.c revision 1.73
1 /* $NetBSD: procfs_vfsops.c,v 1.73 2007/07/26 22:57:39 pooka 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 1.73 2007/07/26 22:57:39 pooka 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 void procfs_init(void); 105 void procfs_reinit(void); 106 void procfs_done(void); 107 int procfs_mount(struct mount *, const char *, void *, size_t *, 108 struct nameidata *, struct lwp *); 109 int procfs_start(struct mount *, int, struct lwp *); 110 int procfs_unmount(struct mount *, int, struct lwp *); 111 int procfs_quotactl(struct mount *, int, uid_t, void *, 112 struct lwp *); 113 int procfs_statvfs(struct mount *, struct statvfs *, struct lwp *); 114 int procfs_sync(struct mount *, int, kauth_cred_t, struct lwp *); 115 int procfs_vget(struct mount *, ino_t, struct vnode **); 116 117 /* 118 * VFS Operations. 119 * 120 * mount system call 121 */ 122 /* ARGSUSED */ 123 int 124 procfs_mount( 125 struct mount *mp, 126 const char *path, 127 void *data, 128 size_t *data_len, 129 struct nameidata *ndp, 130 struct lwp *l 131 ) 132 { 133 struct procfsmount *pmnt; 134 struct procfs_args *args = data; 135 int error; 136 137 if (UIO_MX & (UIO_MX-1)) { 138 log(LOG_ERR, "procfs: invalid directory entry size"); 139 return (EINVAL); 140 } 141 142 if (mp->mnt_flag & MNT_GETARGS) { 143 if (*data_len < sizeof *args) 144 return EINVAL; 145 146 pmnt = VFSTOPROC(mp); 147 if (pmnt == NULL) 148 return EIO; 149 args->version = PROCFS_ARGSVERSION; 150 args->flags = pmnt->pmnt_flags; 151 *data_len = sizeof *args; 152 return 0; 153 } 154 155 if (mp->mnt_flag & MNT_UPDATE) 156 return (EOPNOTSUPP); 157 158 if (*data_len >= sizeof *args && args->version != PROCFS_ARGSVERSION) 159 return EINVAL; 160 161 pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount), 162 M_UFSMNT, M_WAITOK); /* XXX need new malloc type */ 163 164 mp->mnt_stat.f_namemax = MAXNAMLEN; 165 mp->mnt_flag |= MNT_LOCAL; 166 mp->mnt_data = pmnt; 167 vfs_getnewfsid(mp); 168 169 error = set_statvfs_info(path, UIO_USERSPACE, "procfs", UIO_SYSSPACE, 170 mp->mnt_op->vfs_name, mp, l); 171 pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp); 172 if (*data_len >= sizeof *args) 173 pmnt->pmnt_flags = args->flags; 174 else 175 pmnt->pmnt_flags = 0; 176 177 return error; 178 } 179 180 /* 181 * unmount system call 182 */ 183 int 184 procfs_unmount(struct mount *mp, int mntflags, struct lwp *l) 185 { 186 int error; 187 int flags = 0; 188 189 if (mntflags & MNT_FORCE) 190 flags |= FORCECLOSE; 191 192 if ((error = vflush(mp, 0, flags)) != 0) 193 return (error); 194 195 exechook_disestablish(VFSTOPROC(mp)->pmnt_exechook); 196 197 free(mp->mnt_data, M_UFSMNT); 198 mp->mnt_data = 0; 199 200 return (0); 201 } 202 203 int 204 procfs_root(mp, vpp) 205 struct mount *mp; 206 struct vnode **vpp; 207 { 208 209 return (procfs_allocvp(mp, vpp, 0, PFSroot, -1, NULL)); 210 } 211 212 /* ARGSUSED */ 213 int 214 procfs_start(struct mount *mp, int flags, 215 struct lwp *l) 216 { 217 218 return (0); 219 } 220 221 /* 222 * Get file system statistics. 223 */ 224 int 225 procfs_statvfs(struct mount *mp, struct statvfs *sbp, struct lwp *l) 226 { 227 228 sbp->f_bsize = PAGE_SIZE; 229 sbp->f_frsize = PAGE_SIZE; 230 sbp->f_iosize = PAGE_SIZE; 231 sbp->f_blocks = 1; /* avoid divide by zero in some df's */ 232 sbp->f_bfree = 0; 233 sbp->f_bavail = 0; 234 sbp->f_bresvd = 0; 235 sbp->f_files = maxproc; /* approx */ 236 sbp->f_ffree = maxproc - nprocs; /* approx */ 237 sbp->f_favail = maxproc - nprocs; /* approx */ 238 sbp->f_fresvd = 0; 239 copy_statvfs_info(sbp, mp); 240 return (0); 241 } 242 243 /*ARGSUSED*/ 244 int 245 procfs_quotactl( 246 struct mount *mp, 247 int cmds, 248 uid_t uid, 249 void *arg, 250 struct lwp *l 251 ) 252 { 253 254 return (EOPNOTSUPP); 255 } 256 257 /*ARGSUSED*/ 258 int 259 procfs_sync( 260 struct mount *mp, 261 int waitfor, 262 kauth_cred_t uc, 263 struct lwp *l 264 ) 265 { 266 267 return (0); 268 } 269 270 /*ARGSUSED*/ 271 int 272 procfs_vget(struct mount *mp, ino_t ino, 273 struct vnode **vpp) 274 { 275 return (EOPNOTSUPP); 276 } 277 278 void 279 procfs_init() 280 { 281 procfs_hashinit(); 282 } 283 284 void 285 procfs_reinit() 286 { 287 procfs_hashreinit(); 288 } 289 290 void 291 procfs_done() 292 { 293 procfs_hashdone(); 294 } 295 296 SYSCTL_SETUP(sysctl_vfs_procfs_setup, "sysctl vfs.procfs subtree setup") 297 { 298 299 sysctl_createv(clog, 0, NULL, NULL, 300 CTLFLAG_PERMANENT, 301 CTLTYPE_NODE, "vfs", NULL, 302 NULL, 0, NULL, 0, 303 CTL_VFS, CTL_EOL); 304 sysctl_createv(clog, 0, NULL, NULL, 305 CTLFLAG_PERMANENT, 306 CTLTYPE_NODE, "procfs", 307 SYSCTL_DESCR("Process file system"), 308 NULL, 0, NULL, 0, 309 CTL_VFS, 12, CTL_EOL); 310 /* 311 * XXX the "12" above could be dynamic, thereby eliminating 312 * one more instance of the "number to vfs" mapping problem, 313 * but "12" is the order as taken from sys/mount.h 314 */ 315 } 316 317 extern const struct vnodeopv_desc procfs_vnodeop_opv_desc; 318 319 const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = { 320 &procfs_vnodeop_opv_desc, 321 NULL, 322 }; 323 324 struct vfsops procfs_vfsops = { 325 MOUNT_PROCFS, 326 sizeof (struct procfs_args), 327 procfs_mount, 328 procfs_start, 329 procfs_unmount, 330 procfs_root, 331 procfs_quotactl, 332 procfs_statvfs, 333 procfs_sync, 334 procfs_vget, 335 (void *)eopnotsupp, /* vfs_fhtovp */ 336 (void *)eopnotsupp, /* vfs_vptofh */ 337 procfs_init, 338 procfs_reinit, 339 procfs_done, 340 NULL, /* vfs_mountroot */ 341 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 342 vfs_stdextattrctl, 343 (void *)eopnotsupp, /* vfs_suspendctl */ 344 procfs_vnodeopv_descs, 345 0, 346 { NULL, NULL }, 347 }; 348 VFS_ATTACH(procfs_vfsops); 349
Indexes created Mon Sep 29 21:09:56 GMT 2025