kernfs_vfsops.c revision 1.57
1 /* $NetBSD: kernfs_vfsops.c,v 1.57 2003/12/04 19:38:24 atatat 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 1.57 2003/12/04 19:38:24 atatat 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/malloc.h> 57 #include <sys/syslog.h> 58 59 #include <miscfs/specfs/specdev.h> 60 #include <miscfs/kernfs/kernfs.h> 61 62 MALLOC_DEFINE(M_KERNFSMNT, "kernfs mount", "kernfs mount structures"); 63 64 dev_t rrootdev = NODEV; 65 66 void kernfs_init __P((void)); 67 void kernfs_reinit __P((void)); 68 void kernfs_done __P((void)); 69 void kernfs_get_rrootdev __P((void)); 70 int kernfs_mount __P((struct mount *, const char *, void *, 71 struct nameidata *, struct proc *)); 72 int kernfs_start __P((struct mount *, int, struct proc *)); 73 int kernfs_unmount __P((struct mount *, int, struct proc *)); 74 int kernfs_statfs __P((struct mount *, struct statfs *, struct proc *)); 75 int kernfs_quotactl __P((struct mount *, int, uid_t, caddr_t, 76 struct proc *)); 77 int kernfs_sync __P((struct mount *, int, struct ucred *, struct proc *)); 78 int kernfs_vget __P((struct mount *, ino_t, struct vnode **)); 79 int kernfs_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 80 int kernfs_checkexp __P((struct mount *, struct mbuf *, int *, 81 struct ucred **)); 82 int kernfs_vptofh __P((struct vnode *, struct fid *)); 83 84 void 85 kernfs_init() 86 { 87 #ifdef _LKM 88 malloc_type_attach(M_KERNFSMNT); 89 #endif 90 kernfs_hashinit(); 91 } 92 93 void 94 kernfs_reinit() 95 { 96 kernfs_hashreinit(); 97 } 98 99 void 100 kernfs_done() 101 { 102 #ifdef _LKM 103 malloc_type_detach(M_KERNFSMNT); 104 #endif 105 kernfs_hashdone(); 106 } 107 108 void 109 kernfs_get_rrootdev() 110 { 111 static int tried = 0; 112 113 if (tried) { 114 /* Already did it once. */ 115 return; 116 } 117 tried = 1; 118 119 if (rootdev == NODEV) 120 return; 121 rrootdev = devsw_blk2chr(rootdev); 122 if (rrootdev != NODEV) 123 return; 124 rrootdev = NODEV; 125 printf("kernfs_get_rrootdev: no raw root device\n"); 126 } 127 128 /* 129 * Mount the Kernel params filesystem 130 */ 131 int 132 kernfs_mount(mp, path, data, ndp, p) 133 struct mount *mp; 134 const char *path; 135 void *data; 136 struct nameidata *ndp; 137 struct proc *p; 138 { 139 int error = 0; 140 struct kernfs_mount *fmp; 141 142 if (UIO_MX & (UIO_MX - 1)) { 143 log(LOG_ERR, "kernfs: invalid directory entry size"); 144 return (EINVAL); 145 } 146 147 if (mp->mnt_flag & MNT_GETARGS) 148 return 0; 149 /* 150 * Update is a no-op 151 */ 152 if (mp->mnt_flag & MNT_UPDATE) 153 return (EOPNOTSUPP); 154 155 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount), 156 M_KERNFSMNT, M_WAITOK); 157 memset(fmp, 0, sizeof(*fmp)); 158 TAILQ_INIT(&fmp->nodelist); 159 160 mp->mnt_data = fmp; 161 mp->mnt_flag |= MNT_LOCAL; 162 vfs_getnewfsid(mp); 163 164 error = set_statfs_info(path, UIO_USERSPACE, "kernfs", UIO_SYSSPACE, 165 mp, p); 166 167 kernfs_get_rrootdev(); 168 return error; 169 } 170 171 int 172 kernfs_start(mp, flags, p) 173 struct mount *mp; 174 int flags; 175 struct proc *p; 176 { 177 178 return (0); 179 } 180 181 int 182 kernfs_unmount(mp, mntflags, p) 183 struct mount *mp; 184 int mntflags; 185 struct proc *p; 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 /* 197 * Finally, throw away the kernfs_mount structure 198 */ 199 free(mp->mnt_data, M_KERNFSMNT); 200 mp->mnt_data = 0; 201 return (0); 202 } 203 204 int 205 kernfs_root(mp, vpp) 206 struct mount *mp; 207 struct vnode **vpp; 208 { 209 210 /* setup "." */ 211 return (kernfs_allocvp(mp, vpp, KFSkern, &kern_targets[0], 0)); 212 } 213 214 int 215 kernfs_quotactl(mp, cmd, uid, arg, p) 216 struct mount *mp; 217 int cmd; 218 uid_t uid; 219 caddr_t arg; 220 struct proc *p; 221 { 222 223 return (EOPNOTSUPP); 224 } 225 226 int 227 kernfs_statfs(mp, sbp, p) 228 struct mount *mp; 229 struct statfs *sbp; 230 struct proc *p; 231 { 232 233 sbp->f_bsize = DEV_BSIZE; 234 sbp->f_iosize = DEV_BSIZE; 235 sbp->f_blocks = 2; /* 1K to keep df happy */ 236 sbp->f_bfree = 0; 237 sbp->f_bavail = 0; 238 sbp->f_files = 1024; /* XXX lie */ 239 sbp->f_ffree = 128; /* XXX lie */ 240 #ifdef COMPAT_09 241 sbp->f_type = 7; 242 #else 243 sbp->f_type = 0; 244 #endif 245 copy_statfs_info(sbp, mp); 246 return (0); 247 } 248 249 /*ARGSUSED*/ 250 int 251 kernfs_sync(mp, waitfor, uc, p) 252 struct mount *mp; 253 int waitfor; 254 struct ucred *uc; 255 struct proc *p; 256 { 257 258 return (0); 259 } 260 261 /* 262 * Kernfs flat namespace lookup. 263 * Currently unsupported. 264 */ 265 int 266 kernfs_vget(mp, ino, vpp) 267 struct mount *mp; 268 ino_t ino; 269 struct vnode **vpp; 270 { 271 272 return (EOPNOTSUPP); 273 } 274 275 /*ARGSUSED*/ 276 int 277 kernfs_fhtovp(mp, fhp, vpp) 278 struct mount *mp; 279 struct fid *fhp; 280 struct vnode **vpp; 281 { 282 283 return (EOPNOTSUPP); 284 } 285 286 /*ARGSUSED*/ 287 int 288 kernfs_checkexp(mp, mb, what, anon) 289 struct mount *mp; 290 struct mbuf *mb; 291 int *what; 292 struct ucred **anon; 293 { 294 295 return (EOPNOTSUPP); 296 } 297 298 /*ARGSUSED*/ 299 int 300 kernfs_vptofh(vp, fhp) 301 struct vnode *vp; 302 struct fid *fhp; 303 { 304 305 return (EOPNOTSUPP); 306 } 307 308 SYSCTL_SETUP(sysctl_vfs_kern_setup, "sysctl vfs.kern subtree setup") 309 { 310 311 sysctl_createv(SYSCTL_PERMANENT, 312 CTLTYPE_NODE, "vfs", NULL, 313 NULL, 0, NULL, 0, 314 CTL_VFS, CTL_EOL); 315 sysctl_createv(SYSCTL_PERMANENT, 316 CTLTYPE_NODE, "kernfs", NULL, 317 NULL, 0, NULL, 0, 318 CTL_VFS, 11, CTL_EOL); 319 /* 320 * XXX the "11" above could be dynamic, thereby eliminating one 321 * more instance of the "number to vfs" mapping problem, but 322 * "11" is the order as taken from sys/mount.h 323 */ 324 } 325 326 extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc; 327 328 const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = { 329 &kernfs_vnodeop_opv_desc, 330 NULL, 331 }; 332 333 struct vfsops kernfs_vfsops = { 334 MOUNT_KERNFS, 335 kernfs_mount, 336 kernfs_start, 337 kernfs_unmount, 338 kernfs_root, 339 kernfs_quotactl, 340 kernfs_statfs, 341 kernfs_sync, 342 kernfs_vget, 343 kernfs_fhtovp, 344 kernfs_vptofh, 345 kernfs_init, 346 kernfs_reinit, 347 kernfs_done, 348 NULL, 349 NULL, /* vfs_mountroot */ 350 kernfs_checkexp, 351 kernfs_vnodeopv_descs, 352 }; 353
Indexes created Mon Sep 22 10:09:38 GMT 2025