procfs_vfsops.c revision 1.62
1 /* $NetBSD: procfs_vfsops.c,v 1.62 2005/09/23 12:10:33 jmmv 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 1.62 2005/09/23 12:10:33 jmmv 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 99 #include <miscfs/procfs/procfs.h> 100 101 #include <uvm/uvm_extern.h> /* for PAGE_SIZE */ 102 103 void procfs_init(void); 104 void procfs_reinit(void); 105 void procfs_done(void); 106 int procfs_mount(struct mount *, const char *, void *, 107 struct nameidata *, struct proc *); 108 int procfs_start(struct mount *, int, struct proc *); 109 int procfs_unmount(struct mount *, int, struct proc *); 110 int procfs_quotactl(struct mount *, int, uid_t, void *, 111 struct proc *); 112 int procfs_statvfs(struct mount *, struct statvfs *, struct proc *); 113 int procfs_sync(struct mount *, int, struct ucred *, struct proc *); 114 int procfs_vget(struct mount *, ino_t, struct vnode **); 115 116 /* 117 * VFS Operations. 118 * 119 * mount system call 120 */ 121 /* ARGSUSED */ 122 int 123 procfs_mount(mp, path, data, ndp, p) 124 struct mount *mp; 125 const char *path; 126 void *data; 127 struct nameidata *ndp; 128 struct proc *p; 129 { 130 struct procfsmount *pmnt; 131 struct procfs_args args; 132 int error; 133 134 if (UIO_MX & (UIO_MX-1)) { 135 log(LOG_ERR, "procfs: invalid directory entry size"); 136 return (EINVAL); 137 } 138 139 if (mp->mnt_flag & MNT_GETARGS) { 140 pmnt = VFSTOPROC(mp); 141 if (pmnt == NULL) 142 return EIO; 143 args.version = PROCFS_ARGSVERSION; 144 args.flags = pmnt->pmnt_flags; 145 return copyout(&args, data, sizeof(args)); 146 } 147 148 if (mp->mnt_flag & MNT_UPDATE) 149 return (EOPNOTSUPP); 150 151 if (data != NULL) { 152 error = copyin(data, &args, sizeof args); 153 if (error != 0) 154 return error; 155 156 if (args.version != PROCFS_ARGSVERSION) 157 return EINVAL; 158 } else 159 args.flags = 0; 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, p); 171 pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp); 172 pmnt->pmnt_flags = args.flags; 173 174 return error; 175 } 176 177 /* 178 * unmount system call 179 */ 180 int 181 procfs_unmount(mp, mntflags, p) 182 struct mount *mp; 183 int mntflags; 184 struct proc *p; 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)); 210 } 211 212 /* ARGSUSED */ 213 int 214 procfs_start(mp, flags, p) 215 struct mount *mp; 216 int flags; 217 struct proc *p; 218 { 219 220 return (0); 221 } 222 223 /* 224 * Get file system statistics. 225 */ 226 int 227 procfs_statvfs(mp, sbp, p) 228 struct mount *mp; 229 struct statvfs *sbp; 230 struct proc *p; 231 { 232 233 sbp->f_bsize = PAGE_SIZE; 234 sbp->f_frsize = PAGE_SIZE; 235 sbp->f_iosize = PAGE_SIZE; 236 sbp->f_blocks = 1; /* avoid divide by zero in some df's */ 237 sbp->f_bfree = 0; 238 sbp->f_bavail = 0; 239 sbp->f_bresvd = 0; 240 sbp->f_files = maxproc; /* approx */ 241 sbp->f_ffree = maxproc - nprocs; /* approx */ 242 sbp->f_favail = maxproc - nprocs; /* approx */ 243 sbp->f_fresvd = 0; 244 copy_statvfs_info(sbp, mp); 245 return (0); 246 } 247 248 /*ARGSUSED*/ 249 int 250 procfs_quotactl(mp, cmds, uid, arg, p) 251 struct mount *mp; 252 int cmds; 253 uid_t uid; 254 void *arg; 255 struct proc *p; 256 { 257 258 return (EOPNOTSUPP); 259 } 260 261 /*ARGSUSED*/ 262 int 263 procfs_sync(mp, waitfor, uc, p) 264 struct mount *mp; 265 int waitfor; 266 struct ucred *uc; 267 struct proc *p; 268 { 269 270 return (0); 271 } 272 273 /*ARGSUSED*/ 274 int 275 procfs_vget(mp, ino, vpp) 276 struct mount *mp; 277 ino_t ino; 278 struct vnode **vpp; 279 { 280 return (EOPNOTSUPP); 281 } 282 283 void 284 procfs_init() 285 { 286 procfs_hashinit(); 287 } 288 289 void 290 procfs_reinit() 291 { 292 procfs_hashreinit(); 293 } 294 295 void 296 procfs_done() 297 { 298 procfs_hashdone(); 299 } 300 301 SYSCTL_SETUP(sysctl_vfs_procfs_setup, "sysctl vfs.procfs subtree setup") 302 { 303 304 sysctl_createv(clog, 0, NULL, NULL, 305 CTLFLAG_PERMANENT, 306 CTLTYPE_NODE, "vfs", NULL, 307 NULL, 0, NULL, 0, 308 CTL_VFS, CTL_EOL); 309 sysctl_createv(clog, 0, NULL, NULL, 310 CTLFLAG_PERMANENT, 311 CTLTYPE_NODE, "procfs", 312 SYSCTL_DESCR("Process file system"), 313 NULL, 0, NULL, 0, 314 CTL_VFS, 12, CTL_EOL); 315 /* 316 * XXX the "12" above could be dynamic, thereby eliminating 317 * one more instance of the "number to vfs" mapping problem, 318 * but "12" is the order as taken from sys/mount.h 319 */ 320 } 321 322 extern const struct vnodeopv_desc procfs_vnodeop_opv_desc; 323 324 const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = { 325 &procfs_vnodeop_opv_desc, 326 NULL, 327 }; 328 329 struct vfsops procfs_vfsops = { 330 MOUNT_PROCFS, 331 procfs_mount, 332 procfs_start, 333 procfs_unmount, 334 procfs_root, 335 procfs_quotactl, 336 procfs_statvfs, 337 procfs_sync, 338 procfs_vget, 339 NULL, /* vfs_fhtovp */ 340 NULL, /* vfs_vptofh */ 341 procfs_init, 342 procfs_reinit, 343 procfs_done, 344 NULL, /* vfs_mountroot */ 345 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 346 vfs_stdextattrctl, 347 procfs_vnodeopv_descs, 348 }; 349 VFS_ATTACH(procfs_vfsops); 350
Indexes created Mon Sep 29 21:09:56 GMT 2025