procfs_vfsops.c revision 1.64
1 /* $NetBSD: procfs_vfsops.c,v 1.64 2006/05/14 21:31:53 elad 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 1.64 2006/05/14 21:31:53 elad 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 *, 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(mp, path, data, ndp, l) 125 struct mount *mp; 126 const char *path; 127 void *data; 128 struct nameidata *ndp; 129 struct lwp *l; 130 { 131 struct procfsmount *pmnt; 132 struct procfs_args args; 133 int error; 134 135 if (UIO_MX & (UIO_MX-1)) { 136 log(LOG_ERR, "procfs: invalid directory entry size"); 137 return (EINVAL); 138 } 139 140 if (mp->mnt_flag & MNT_GETARGS) { 141 pmnt = VFSTOPROC(mp); 142 if (pmnt == NULL) 143 return EIO; 144 args.version = PROCFS_ARGSVERSION; 145 args.flags = pmnt->pmnt_flags; 146 return copyout(&args, data, sizeof(args)); 147 } 148 149 if (mp->mnt_flag & MNT_UPDATE) 150 return (EOPNOTSUPP); 151 152 if (data != NULL) { 153 error = copyin(data, &args, sizeof args); 154 if (error != 0) 155 return error; 156 157 if (args.version != PROCFS_ARGSVERSION) 158 return EINVAL; 159 } else 160 args.flags = 0; 161 162 pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount), 163 M_UFSMNT, M_WAITOK); /* XXX need new malloc type */ 164 165 mp->mnt_stat.f_namemax = MAXNAMLEN; 166 mp->mnt_flag |= MNT_LOCAL; 167 mp->mnt_data = pmnt; 168 vfs_getnewfsid(mp); 169 170 error = set_statvfs_info(path, UIO_USERSPACE, "procfs", UIO_SYSSPACE, 171 mp, l); 172 pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp); 173 pmnt->pmnt_flags = args.flags; 174 175 return error; 176 } 177 178 /* 179 * unmount system call 180 */ 181 int 182 procfs_unmount(mp, mntflags, l) 183 struct mount *mp; 184 int mntflags; 185 struct lwp *l; 186 { 187 int error; 188 int flags = 0; 189 190 if (mntflags & MNT_FORCE) 191 flags |= FORCECLOSE; 192 193 if ((error = vflush(mp, 0, flags)) != 0) 194 return (error); 195 196 exechook_disestablish(VFSTOPROC(mp)->pmnt_exechook); 197 198 free(mp->mnt_data, M_UFSMNT); 199 mp->mnt_data = 0; 200 201 return (0); 202 } 203 204 int 205 procfs_root(mp, vpp) 206 struct mount *mp; 207 struct vnode **vpp; 208 { 209 210 return (procfs_allocvp(mp, vpp, 0, PFSroot, -1)); 211 } 212 213 /* ARGSUSED */ 214 int 215 procfs_start(mp, flags, l) 216 struct mount *mp; 217 int flags; 218 struct lwp *l; 219 { 220 221 return (0); 222 } 223 224 /* 225 * Get file system statistics. 226 */ 227 int 228 procfs_statvfs(mp, sbp, l) 229 struct mount *mp; 230 struct statvfs *sbp; 231 struct lwp *l; 232 { 233 234 sbp->f_bsize = PAGE_SIZE; 235 sbp->f_frsize = PAGE_SIZE; 236 sbp->f_iosize = PAGE_SIZE; 237 sbp->f_blocks = 1; /* avoid divide by zero in some df's */ 238 sbp->f_bfree = 0; 239 sbp->f_bavail = 0; 240 sbp->f_bresvd = 0; 241 sbp->f_files = maxproc; /* approx */ 242 sbp->f_ffree = maxproc - nprocs; /* approx */ 243 sbp->f_favail = maxproc - nprocs; /* approx */ 244 sbp->f_fresvd = 0; 245 copy_statvfs_info(sbp, mp); 246 return (0); 247 } 248 249 /*ARGSUSED*/ 250 int 251 procfs_quotactl(mp, cmds, uid, arg, l) 252 struct mount *mp; 253 int cmds; 254 uid_t uid; 255 void *arg; 256 struct lwp *l; 257 { 258 259 return (EOPNOTSUPP); 260 } 261 262 /*ARGSUSED*/ 263 int 264 procfs_sync(mp, waitfor, uc, l) 265 struct mount *mp; 266 int waitfor; 267 kauth_cred_t uc; 268 struct lwp *l; 269 { 270 271 return (0); 272 } 273 274 /*ARGSUSED*/ 275 int 276 procfs_vget(mp, ino, vpp) 277 struct mount *mp; 278 ino_t ino; 279 struct vnode **vpp; 280 { 281 return (EOPNOTSUPP); 282 } 283 284 void 285 procfs_init() 286 { 287 procfs_hashinit(); 288 } 289 290 void 291 procfs_reinit() 292 { 293 procfs_hashreinit(); 294 } 295 296 void 297 procfs_done() 298 { 299 procfs_hashdone(); 300 } 301 302 SYSCTL_SETUP(sysctl_vfs_procfs_setup, "sysctl vfs.procfs subtree setup") 303 { 304 305 sysctl_createv(clog, 0, NULL, NULL, 306 CTLFLAG_PERMANENT, 307 CTLTYPE_NODE, "vfs", NULL, 308 NULL, 0, NULL, 0, 309 CTL_VFS, CTL_EOL); 310 sysctl_createv(clog, 0, NULL, NULL, 311 CTLFLAG_PERMANENT, 312 CTLTYPE_NODE, "procfs", 313 SYSCTL_DESCR("Process file system"), 314 NULL, 0, NULL, 0, 315 CTL_VFS, 12, CTL_EOL); 316 /* 317 * XXX the "12" above could be dynamic, thereby eliminating 318 * one more instance of the "number to vfs" mapping problem, 319 * but "12" is the order as taken from sys/mount.h 320 */ 321 } 322 323 extern const struct vnodeopv_desc procfs_vnodeop_opv_desc; 324 325 const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = { 326 &procfs_vnodeop_opv_desc, 327 NULL, 328 }; 329 330 struct vfsops procfs_vfsops = { 331 MOUNT_PROCFS, 332 procfs_mount, 333 procfs_start, 334 procfs_unmount, 335 procfs_root, 336 procfs_quotactl, 337 procfs_statvfs, 338 procfs_sync, 339 procfs_vget, 340 NULL, /* vfs_fhtovp */ 341 NULL, /* vfs_vptofh */ 342 procfs_init, 343 procfs_reinit, 344 procfs_done, 345 NULL, /* vfs_mountroot */ 346 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 347 vfs_stdextattrctl, 348 procfs_vnodeopv_descs, 349 }; 350 VFS_ATTACH(procfs_vfsops); 351
Indexes created Mon Sep 29 21:09:56 GMT 2025