procfs_vfsops.c revision 1.75.6.1
1 /* $NetBSD: procfs_vfsops.c,v 1.75.6.1 2008/01/02 21:56:56 bouyer 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 1.75.6.1 2008/01/02 21:56:56 bouyer 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 { 119 struct lwp *l = curlwp; 120 struct procfsmount *pmnt; 121 struct procfs_args *args = data; 122 int error; 123 124 if (UIO_MX & (UIO_MX-1)) { 125 log(LOG_ERR, "procfs: invalid directory entry size"); 126 return (EINVAL); 127 } 128 129 if (mp->mnt_flag & MNT_GETARGS) { 130 if (*data_len < sizeof *args) 131 return EINVAL; 132 133 pmnt = VFSTOPROC(mp); 134 if (pmnt == NULL) 135 return EIO; 136 args->version = PROCFS_ARGSVERSION; 137 args->flags = pmnt->pmnt_flags; 138 *data_len = sizeof *args; 139 return 0; 140 } 141 142 if (mp->mnt_flag & MNT_UPDATE) 143 return (EOPNOTSUPP); 144 145 if (*data_len >= sizeof *args && args->version != PROCFS_ARGSVERSION) 146 return EINVAL; 147 148 pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount), 149 M_UFSMNT, M_WAITOK); /* XXX need new malloc type */ 150 151 mp->mnt_stat.f_namemax = MAXNAMLEN; 152 mp->mnt_flag |= MNT_LOCAL; 153 mp->mnt_data = pmnt; 154 vfs_getnewfsid(mp); 155 156 error = set_statvfs_info(path, UIO_USERSPACE, "procfs", UIO_SYSSPACE, 157 mp->mnt_op->vfs_name, mp, l); 158 pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp); 159 if (*data_len >= sizeof *args) 160 pmnt->pmnt_flags = args->flags; 161 else 162 pmnt->pmnt_flags = 0; 163 164 mp->mnt_iflag |= IMNT_MPSAFE; 165 return error; 166 } 167 168 /* 169 * unmount system call 170 */ 171 int 172 procfs_unmount(struct mount *mp, int mntflags) 173 { 174 int error; 175 int flags = 0; 176 177 if (mntflags & MNT_FORCE) 178 flags |= FORCECLOSE; 179 180 if ((error = vflush(mp, 0, flags)) != 0) 181 return (error); 182 183 exechook_disestablish(VFSTOPROC(mp)->pmnt_exechook); 184 185 free(mp->mnt_data, M_UFSMNT); 186 mp->mnt_data = 0; 187 188 return (0); 189 } 190 191 int 192 procfs_root(mp, vpp) 193 struct mount *mp; 194 struct vnode **vpp; 195 { 196 197 return (procfs_allocvp(mp, vpp, 0, PFSroot, -1, NULL)); 198 } 199 200 /* ARGSUSED */ 201 int 202 procfs_start(struct mount *mp, int flags) 203 { 204 205 return (0); 206 } 207 208 /* 209 * Get file system statistics. 210 */ 211 int 212 procfs_statvfs(struct mount *mp, struct statvfs *sbp) 213 { 214 215 sbp->f_bsize = PAGE_SIZE; 216 sbp->f_frsize = PAGE_SIZE; 217 sbp->f_iosize = PAGE_SIZE; 218 sbp->f_blocks = 1; /* avoid divide by zero in some df's */ 219 sbp->f_bfree = 0; 220 sbp->f_bavail = 0; 221 sbp->f_bresvd = 0; 222 sbp->f_files = maxproc; /* approx */ 223 sbp->f_ffree = maxproc - nprocs; /* approx */ 224 sbp->f_favail = maxproc - nprocs; /* approx */ 225 sbp->f_fresvd = 0; 226 copy_statvfs_info(sbp, mp); 227 return (0); 228 } 229 230 /*ARGSUSED*/ 231 int 232 procfs_sync( 233 struct mount *mp, 234 int waitfor, 235 kauth_cred_t uc) 236 { 237 238 return (0); 239 } 240 241 /*ARGSUSED*/ 242 int 243 procfs_vget(struct mount *mp, ino_t ino, 244 struct vnode **vpp) 245 { 246 return (EOPNOTSUPP); 247 } 248 249 void 250 procfs_init() 251 { 252 procfs_hashinit(); 253 } 254 255 void 256 procfs_reinit() 257 { 258 procfs_hashreinit(); 259 } 260 261 void 262 procfs_done() 263 { 264 procfs_hashdone(); 265 } 266 267 SYSCTL_SETUP(sysctl_vfs_procfs_setup, "sysctl vfs.procfs subtree setup") 268 { 269 270 sysctl_createv(clog, 0, NULL, NULL, 271 CTLFLAG_PERMANENT, 272 CTLTYPE_NODE, "vfs", NULL, 273 NULL, 0, NULL, 0, 274 CTL_VFS, CTL_EOL); 275 sysctl_createv(clog, 0, NULL, NULL, 276 CTLFLAG_PERMANENT, 277 CTLTYPE_NODE, "procfs", 278 SYSCTL_DESCR("Process file system"), 279 NULL, 0, NULL, 0, 280 CTL_VFS, 12, CTL_EOL); 281 /* 282 * XXX the "12" above could be dynamic, thereby eliminating 283 * one more instance of the "number to vfs" mapping problem, 284 * but "12" is the order as taken from sys/mount.h 285 */ 286 } 287 288 extern const struct vnodeopv_desc procfs_vnodeop_opv_desc; 289 290 const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = { 291 &procfs_vnodeop_opv_desc, 292 NULL, 293 }; 294 295 struct vfsops procfs_vfsops = { 296 MOUNT_PROCFS, 297 sizeof (struct procfs_args), 298 procfs_mount, 299 procfs_start, 300 procfs_unmount, 301 procfs_root, 302 (void *)eopnotsupp, /* vfs_quotactl */ 303 procfs_statvfs, 304 procfs_sync, 305 procfs_vget, 306 (void *)eopnotsupp, /* vfs_fhtovp */ 307 (void *)eopnotsupp, /* vfs_vptofh */ 308 procfs_init, 309 procfs_reinit, 310 procfs_done, 311 NULL, /* vfs_mountroot */ 312 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 313 vfs_stdextattrctl, 314 (void *)eopnotsupp, /* vfs_suspendctl */ 315 procfs_vnodeopv_descs, 316 0, 317 { NULL, NULL }, 318 }; 319 VFS_ATTACH(procfs_vfsops); 320
Indexes created Mon Sep 29 21:09:56 GMT 2025