kernfs_vfsops.c revision 1.52.2.2
1 /* $NetBSD: kernfs_vfsops.c,v 1.52.2.2 2004/08/03 10:54:05 skrll Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software donated 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 * @(#)kernfs_vfsops.c 8.10 (Berkeley) 5/14/95 35 */ 36 37 /* 38 * Kernel params Filesystem 39 */ 40 41 #include <sys/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: kernfs_vfsops.c,v 1.52.2.2 2004/08/03 10:54:05 skrll Exp $"); 43 44 #ifdef _KERNEL_OPT 45 #include "opt_compat_netbsd.h" 46 #endif 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/sysctl.h> 51 #include <sys/conf.h> 52 #include <sys/proc.h> 53 #include <sys/vnode.h> 54 #include <sys/mount.h> 55 #include <sys/namei.h> 56 #include <sys/dirent.h> 57 #include <sys/malloc.h> 58 #include <sys/syslog.h> 59 60 #include <miscfs/specfs/specdev.h> 61 #include <miscfs/kernfs/kernfs.h> 62 63 MALLOC_DEFINE(M_KERNFSMNT, "kernfs mount", "kernfs mount structures"); 64 65 dev_t rrootdev = NODEV; 66 67 void kernfs_init __P((void)); 68 void kernfs_reinit __P((void)); 69 void kernfs_done __P((void)); 70 void kernfs_get_rrootdev __P((void)); 71 int kernfs_mount __P((struct mount *, const char *, void *, 72 struct nameidata *, struct lwp *)); 73 int kernfs_start __P((struct mount *, int, struct lwp *)); 74 int kernfs_unmount __P((struct mount *, int, struct lwp *)); 75 int kernfs_statvfs __P((struct mount *, struct statvfs *, struct lwp *)); 76 int kernfs_quotactl __P((struct mount *, int, uid_t, void *, 77 struct lwp *)); 78 int kernfs_sync __P((struct mount *, int, struct ucred *, struct lwp *)); 79 int kernfs_vget __P((struct mount *, ino_t, struct vnode **, struct lwp *)); 80 int kernfs_fhtovp __P((struct mount *, struct fid *, struct vnode **, 81 struct lwp *)); 82 int kernfs_checkexp __P((struct mount *, struct mbuf *, int *, 83 struct ucred **)); 84 int kernfs_vptofh __P((struct vnode *, struct fid *)); 85 86 void 87 kernfs_init() 88 { 89 #ifdef _LKM 90 malloc_type_attach(M_KERNFSMNT); 91 #endif 92 kernfs_hashinit(); 93 } 94 95 void 96 kernfs_reinit() 97 { 98 kernfs_hashreinit(); 99 } 100 101 void 102 kernfs_done() 103 { 104 #ifdef _LKM 105 malloc_type_detach(M_KERNFSMNT); 106 #endif 107 kernfs_hashdone(); 108 } 109 110 void 111 kernfs_get_rrootdev() 112 { 113 static int tried = 0; 114 115 if (tried) { 116 /* Already did it once. */ 117 return; 118 } 119 tried = 1; 120 121 if (rootdev == NODEV) 122 return; 123 rrootdev = devsw_blk2chr(rootdev); 124 if (rrootdev != NODEV) 125 return; 126 rrootdev = NODEV; 127 printf("kernfs_get_rrootdev: no raw root device\n"); 128 } 129 130 /* 131 * Mount the Kernel params filesystem 132 */ 133 int 134 kernfs_mount(mp, path, data, ndp, l) 135 struct mount *mp; 136 const char *path; 137 void *data; 138 struct nameidata *ndp; 139 struct lwp *l; 140 { 141 int error = 0; 142 struct kernfs_mount *fmp; 143 144 if (UIO_MX & (UIO_MX - 1)) { 145 log(LOG_ERR, "kernfs: invalid directory entry size"); 146 return (EINVAL); 147 } 148 149 if (mp->mnt_flag & MNT_GETARGS) 150 return 0; 151 /* 152 * Update is a no-op 153 */ 154 if (mp->mnt_flag & MNT_UPDATE) 155 return (EOPNOTSUPP); 156 157 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount), 158 M_KERNFSMNT, M_WAITOK); 159 memset(fmp, 0, sizeof(*fmp)); 160 TAILQ_INIT(&fmp->nodelist); 161 162 mp->mnt_data = fmp; 163 mp->mnt_flag |= MNT_LOCAL; 164 vfs_getnewfsid(mp); 165 166 if ((error = set_statvfs_info(path, UIO_USERSPACE, "kernfs", 167 UIO_SYSSPACE, mp, l)) != 0) { 168 free(fmp, M_KERNFSMNT); 169 return error; 170 } 171 172 kernfs_get_rrootdev(); 173 return 0; 174 } 175 176 int 177 kernfs_start(mp, flags, l) 178 struct mount *mp; 179 int flags; 180 struct lwp *l; 181 { 182 183 return (0); 184 } 185 186 int 187 kernfs_unmount(mp, mntflags, l) 188 struct mount *mp; 189 int mntflags; 190 struct lwp *l; 191 { 192 int error; 193 int flags = 0; 194 195 if (mntflags & MNT_FORCE) 196 flags |= FORCECLOSE; 197 198 if ((error = vflush(mp, 0, flags)) != 0) 199 return (error); 200 201 /* 202 * Finally, throw away the kernfs_mount structure 203 */ 204 free(mp->mnt_data, M_KERNFSMNT); 205 mp->mnt_data = NULL; 206 return (0); 207 } 208 209 int 210 kernfs_root(mp, vpp, l) 211 struct mount *mp; 212 struct vnode **vpp; 213 struct lwp *l; 214 { 215 216 /* setup "." */ 217 return (kernfs_allocvp(mp, vpp, KFSkern, &kern_targets[0], 0, l)); 218 } 219 220 int 221 kernfs_quotactl(mp, cmd, uid, arg, l) 222 struct mount *mp; 223 int cmd; 224 uid_t uid; 225 void *arg; 226 struct lwp *l; 227 { 228 229 return (EOPNOTSUPP); 230 } 231 232 int 233 kernfs_statvfs(mp, sbp, l) 234 struct mount *mp; 235 struct statvfs *sbp; 236 struct lwp *l; 237 { 238 239 sbp->f_bsize = DEV_BSIZE; 240 sbp->f_frsize = DEV_BSIZE; 241 sbp->f_iosize = DEV_BSIZE; 242 sbp->f_blocks = 2; /* 1K to keep df happy */ 243 sbp->f_bfree = 0; 244 sbp->f_bavail = 0; 245 sbp->f_bresvd = 0; 246 sbp->f_files = 1024; /* XXX lie */ 247 sbp->f_ffree = 128; /* XXX lie */ 248 sbp->f_favail = 128; /* XXX lie */ 249 sbp->f_fresvd = 0; 250 sbp->f_namemax = MAXNAMLEN; 251 copy_statvfs_info(sbp, mp); 252 return (0); 253 } 254 255 /*ARGSUSED*/ 256 int 257 kernfs_sync(mp, waitfor, uc, l) 258 struct mount *mp; 259 int waitfor; 260 struct ucred *uc; 261 struct lwp *l; 262 { 263 264 return (0); 265 } 266 267 /* 268 * Kernfs flat namespace lookup. 269 * Currently unsupported. 270 */ 271 int 272 kernfs_vget(mp, ino, vpp, l) 273 struct mount *mp; 274 ino_t ino; 275 struct vnode **vpp; 276 struct lwp *l; 277 { 278 279 return (EOPNOTSUPP); 280 } 281 282 /*ARGSUSED*/ 283 int 284 kernfs_fhtovp(mp, fhp, vpp, l) 285 struct mount *mp; 286 struct fid *fhp; 287 struct vnode **vpp; 288 struct lwp *l; 289 { 290 291 return (EOPNOTSUPP); 292 } 293 294 /*ARGSUSED*/ 295 int 296 kernfs_checkexp(mp, mb, what, anon) 297 struct mount *mp; 298 struct mbuf *mb; 299 int *what; 300 struct ucred **anon; 301 { 302 303 return (EOPNOTSUPP); 304 } 305 306 /*ARGSUSED*/ 307 int 308 kernfs_vptofh(vp, fhp) 309 struct vnode *vp; 310 struct fid *fhp; 311 { 312 313 return (EOPNOTSUPP); 314 } 315 316 SYSCTL_SETUP(sysctl_vfs_kernfs_setup, "sysctl vfs.kern subtree setup") 317 { 318 319 sysctl_createv(clog, 0, NULL, NULL, 320 CTLFLAG_PERMANENT, 321 CTLTYPE_NODE, "vfs", NULL, 322 NULL, 0, NULL, 0, 323 CTL_VFS, CTL_EOL); 324 sysctl_createv(clog, 0, NULL, NULL, 325 CTLFLAG_PERMANENT, 326 CTLTYPE_NODE, "kernfs", 327 SYSCTL_DESCR("/kern file system"), 328 NULL, 0, NULL, 0, 329 CTL_VFS, 11, CTL_EOL); 330 /* 331 * XXX the "11" above could be dynamic, thereby eliminating one 332 * more instance of the "number to vfs" mapping problem, but 333 * "11" is the order as taken from sys/mount.h 334 */ 335 } 336 337 extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc; 338 339 const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = { 340 &kernfs_vnodeop_opv_desc, 341 NULL, 342 }; 343 344 struct vfsops kernfs_vfsops = { 345 MOUNT_KERNFS, 346 kernfs_mount, 347 kernfs_start, 348 kernfs_unmount, 349 kernfs_root, 350 kernfs_quotactl, 351 kernfs_statvfs, 352 kernfs_sync, 353 kernfs_vget, 354 kernfs_fhtovp, 355 kernfs_vptofh, 356 kernfs_init, 357 kernfs_reinit, 358 kernfs_done, 359 NULL, 360 NULL, /* vfs_mountroot */ 361 kernfs_checkexp, 362 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 363 kernfs_vnodeopv_descs, 364 }; 365
Indexes created Mon Sep 29 21:09:56 GMT 2025