procfs_vfsops.c revision 1.70
1 /* $NetBSD: procfs_vfsops.c,v 1.70 2007/02/09 21:55:36 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 2007/02/09 21:55:36 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 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( 125 struct mount *mp, 126 const char *path, 127 void *data, 128 struct nameidata *ndp, 129 struct lwp *l 130 ) 131 { 132 struct procfsmount *pmnt; 133 struct procfs_args args; 134 int error; 135 136 if (UIO_MX & (UIO_MX-1)) { 137 log(LOG_ERR, "procfs: invalid directory entry size"); 138 return (EINVAL); 139 } 140 141 if (mp->mnt_flag & MNT_GETARGS) { 142 pmnt = VFSTOPROC(mp); 143 if (pmnt == NULL) 144 return EIO; 145 args.version = PROCFS_ARGSVERSION; 146 args.flags = pmnt->pmnt_flags; 147 return copyout(&args, data, sizeof(args)); 148 } 149 150 if (mp->mnt_flag & MNT_UPDATE) 151 return (EOPNOTSUPP); 152 153 if (data != NULL) { 154 error = copyin(data, &args, sizeof args); 155 if (error != 0) 156 return error; 157 158 if (args.version != PROCFS_ARGSVERSION) 159 return EINVAL; 160 } else 161 args.flags = 0; 162 163 pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount), 164 M_UFSMNT, M_WAITOK); /* XXX need new malloc type */ 165 166 mp->mnt_stat.f_namemax = MAXNAMLEN; 167 mp->mnt_flag |= MNT_LOCAL; 168 mp->mnt_data = pmnt; 169 vfs_getnewfsid(mp); 170 171 error = set_statvfs_info(path, UIO_USERSPACE, "procfs", UIO_SYSSPACE, 172 mp, l); 173 pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp); 174 pmnt->pmnt_flags = args.flags; 175 176 return error; 177 } 178 179 /* 180 * unmount system call 181 */ 182 int 183 procfs_unmount(struct mount *mp, int mntflags, struct lwp *l) 184 { 185 int error; 186 int flags = 0; 187 188 if (mntflags & MNT_FORCE) 189 flags |= FORCECLOSE; 190 191 if ((error = vflush(mp, 0, flags)) != 0) 192 return (error); 193 194 exechook_disestablish(VFSTOPROC(mp)->pmnt_exechook); 195 196 free(mp->mnt_data, M_UFSMNT); 197 mp->mnt_data = 0; 198 199 return (0); 200 } 201 202 int 203 procfs_root(mp, vpp) 204 struct mount *mp; 205 struct vnode **vpp; 206 { 207 208 return (procfs_allocvp(mp, vpp, 0, PFSroot, -1, NULL)); 209 } 210 211 /* ARGSUSED */ 212 int 213 procfs_start(struct mount *mp, int flags, 214 struct lwp *l) 215 { 216 217 return (0); 218 } 219 220 /* 221 * Get file system statistics. 222 */ 223 int 224 procfs_statvfs(struct mount *mp, struct statvfs *sbp, struct lwp *l) 225 { 226 227 sbp->f_bsize = PAGE_SIZE; 228 sbp->f_frsize = PAGE_SIZE; 229 sbp->f_iosize = PAGE_SIZE; 230 sbp->f_blocks = 1; /* avoid divide by zero in some df's */ 231 sbp->f_bfree = 0; 232 sbp->f_bavail = 0; 233 sbp->f_bresvd = 0; 234 sbp->f_files = maxproc; /* approx */ 235 sbp->f_ffree = maxproc - nprocs; /* approx */ 236 sbp->f_favail = maxproc - nprocs; /* approx */ 237 sbp->f_fresvd = 0; 238 copy_statvfs_info(sbp, mp); 239 return (0); 240 } 241 242 /*ARGSUSED*/ 243 int 244 procfs_quotactl( 245 struct mount *mp, 246 int cmds, 247 uid_t uid, 248 void *arg, 249 struct lwp *l 250 ) 251 { 252 253 return (EOPNOTSUPP); 254 } 255 256 /*ARGSUSED*/ 257 int 258 procfs_sync( 259 struct mount *mp, 260 int waitfor, 261 kauth_cred_t uc, 262 struct lwp *l 263 ) 264 { 265 266 return (0); 267 } 268 269 /*ARGSUSED*/ 270 int 271 procfs_vget(struct mount *mp, ino_t ino, 272 struct vnode **vpp) 273 { 274 return (EOPNOTSUPP); 275 } 276 277 void 278 procfs_init() 279 { 280 procfs_hashinit(); 281 } 282 283 void 284 procfs_reinit() 285 { 286 procfs_hashreinit(); 287 } 288 289 void 290 procfs_done() 291 { 292 procfs_hashdone(); 293 } 294 295 SYSCTL_SETUP(sysctl_vfs_procfs_setup, "sysctl vfs.procfs subtree setup") 296 { 297 298 sysctl_createv(clog, 0, NULL, NULL, 299 CTLFLAG_PERMANENT, 300 CTLTYPE_NODE, "vfs", NULL, 301 NULL, 0, NULL, 0, 302 CTL_VFS, CTL_EOL); 303 sysctl_createv(clog, 0, NULL, NULL, 304 CTLFLAG_PERMANENT, 305 CTLTYPE_NODE, "procfs", 306 SYSCTL_DESCR("Process file system"), 307 NULL, 0, NULL, 0, 308 CTL_VFS, 12, CTL_EOL); 309 /* 310 * XXX the "12" above could be dynamic, thereby eliminating 311 * one more instance of the "number to vfs" mapping problem, 312 * but "12" is the order as taken from sys/mount.h 313 */ 314 } 315 316 extern const struct vnodeopv_desc procfs_vnodeop_opv_desc; 317 318 const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = { 319 &procfs_vnodeop_opv_desc, 320 NULL, 321 }; 322 323 struct vfsops procfs_vfsops = { 324 MOUNT_PROCFS, 325 procfs_mount, 326 procfs_start, 327 procfs_unmount, 328 procfs_root, 329 procfs_quotactl, 330 procfs_statvfs, 331 procfs_sync, 332 procfs_vget, 333 (void *)eopnotsupp, /* vfs_fhtovp */ 334 (void *)eopnotsupp, /* vfs_vptofh */ 335 procfs_init, 336 procfs_reinit, 337 procfs_done, 338 NULL, /* vfs_mountroot */ 339 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 340 vfs_stdextattrctl, 341 vfs_stdsuspendctl, 342 procfs_vnodeopv_descs, 343 0, 344 { NULL, NULL }, 345 }; 346 VFS_ATTACH(procfs_vfsops); 347
Indexes created Mon Sep 29 21:09:56 GMT 2025