kernfs_vfsops.c revision 1.72
1 /* $NetBSD: kernfs_vfsops.c,v 1.72 2006/09/02 06:37:41 christos 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 1.72 2006/09/02 06:37:41 christos 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 #include <sys/kauth.h> 60 61 #include <miscfs/specfs/specdev.h> 62 #include <miscfs/kernfs/kernfs.h> 63 64 MALLOC_DEFINE(M_KERNFSMNT, "kernfs mount", "kernfs mount structures"); 65 66 dev_t rrootdev = NODEV; 67 68 void kernfs_init(void); 69 void kernfs_reinit(void); 70 void kernfs_done(void); 71 void kernfs_get_rrootdev(void); 72 int kernfs_mount(struct mount *, const char *, void *, 73 struct nameidata *, struct lwp *); 74 int kernfs_start(struct mount *, int, struct lwp *); 75 int kernfs_unmount(struct mount *, int, struct lwp *); 76 int kernfs_statvfs(struct mount *, struct statvfs *, struct lwp *); 77 int kernfs_quotactl(struct mount *, int, uid_t, void *, 78 struct lwp *); 79 int kernfs_sync(struct mount *, int, kauth_cred_t, struct lwp *); 80 int kernfs_vget(struct mount *, ino_t, struct vnode **); 81 82 void 83 kernfs_init() 84 { 85 #ifdef _LKM 86 malloc_type_attach(M_KERNFSMNT); 87 #endif 88 kernfs_hashinit(); 89 } 90 91 void 92 kernfs_reinit() 93 { 94 kernfs_hashreinit(); 95 } 96 97 void 98 kernfs_done() 99 { 100 #ifdef _LKM 101 malloc_type_detach(M_KERNFSMNT); 102 #endif 103 kernfs_hashdone(); 104 } 105 106 void 107 kernfs_get_rrootdev() 108 { 109 static int tried = 0; 110 111 if (tried) { 112 /* Already did it once. */ 113 return; 114 } 115 tried = 1; 116 117 if (rootdev == NODEV) 118 return; 119 rrootdev = devsw_blk2chr(rootdev); 120 if (rrootdev != NODEV) 121 return; 122 rrootdev = NODEV; 123 printf("kernfs_get_rrootdev: no raw root device\n"); 124 } 125 126 /* 127 * Mount the Kernel params filesystem 128 */ 129 int 130 kernfs_mount(mp, path, data, ndp, l) 131 struct mount *mp; 132 const char *path; 133 void *data; 134 struct nameidata *ndp; 135 struct lwp *l; 136 { 137 int error = 0; 138 struct kernfs_mount *fmp; 139 140 if (UIO_MX & (UIO_MX - 1)) { 141 log(LOG_ERR, "kernfs: invalid directory entry size"); 142 return (EINVAL); 143 } 144 145 if (mp->mnt_flag & MNT_GETARGS) 146 return 0; 147 /* 148 * Update is a no-op 149 */ 150 if (mp->mnt_flag & MNT_UPDATE) 151 return (EOPNOTSUPP); 152 153 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount), 154 M_KERNFSMNT, M_WAITOK); 155 memset(fmp, 0, sizeof(*fmp)); 156 TAILQ_INIT(&fmp->nodelist); 157 158 mp->mnt_stat.f_namemax = MAXNAMLEN; 159 mp->mnt_flag |= MNT_LOCAL; 160 mp->mnt_data = fmp; 161 vfs_getnewfsid(mp); 162 163 if ((error = set_statvfs_info(path, UIO_USERSPACE, "kernfs", 164 UIO_SYSSPACE, mp, l)) != 0) { 165 free(fmp, M_KERNFSMNT); 166 return error; 167 } 168 169 kernfs_get_rrootdev(); 170 return 0; 171 } 172 173 int 174 kernfs_start(mp, flags, l) 175 struct mount *mp; 176 int flags; 177 struct lwp *l; 178 { 179 180 return (0); 181 } 182 183 int 184 kernfs_unmount(mp, mntflags, l) 185 struct mount *mp; 186 int mntflags; 187 struct lwp *l; 188 { 189 int error; 190 int flags = 0; 191 192 if (mntflags & MNT_FORCE) 193 flags |= FORCECLOSE; 194 195 if ((error = vflush(mp, 0, flags)) != 0) 196 return (error); 197 198 /* 199 * Finally, throw away the kernfs_mount structure 200 */ 201 free(mp->mnt_data, M_KERNFSMNT); 202 mp->mnt_data = NULL; 203 return (0); 204 } 205 206 int 207 kernfs_root(mp, vpp) 208 struct mount *mp; 209 struct vnode **vpp; 210 { 211 212 /* setup "." */ 213 return (kernfs_allocvp(mp, vpp, KFSkern, &kern_targets[0], 0)); 214 } 215 216 int 217 kernfs_quotactl(mp, cmd, uid, arg, l) 218 struct mount *mp; 219 int cmd; 220 uid_t uid; 221 void *arg; 222 struct lwp *l; 223 { 224 225 return (EOPNOTSUPP); 226 } 227 228 int 229 kernfs_statvfs(mp, sbp, l) 230 struct mount *mp; 231 struct statvfs *sbp; 232 struct lwp *l; 233 { 234 235 sbp->f_bsize = DEV_BSIZE; 236 sbp->f_frsize = DEV_BSIZE; 237 sbp->f_iosize = DEV_BSIZE; 238 sbp->f_blocks = 2; /* 1K to keep df happy */ 239 sbp->f_bfree = 0; 240 sbp->f_bavail = 0; 241 sbp->f_bresvd = 0; 242 sbp->f_files = 1024; /* XXX lie */ 243 sbp->f_ffree = 128; /* XXX lie */ 244 sbp->f_favail = 128; /* XXX lie */ 245 sbp->f_fresvd = 0; 246 copy_statvfs_info(sbp, mp); 247 return (0); 248 } 249 250 /*ARGSUSED*/ 251 int 252 kernfs_sync(mp, waitfor, uc, l) 253 struct mount *mp; 254 int waitfor; 255 kauth_cred_t uc; 256 struct lwp *l; 257 { 258 259 return (0); 260 } 261 262 /* 263 * Kernfs flat namespace lookup. 264 * Currently unsupported. 265 */ 266 int 267 kernfs_vget(mp, ino, vpp) 268 struct mount *mp; 269 ino_t ino; 270 struct vnode **vpp; 271 { 272 273 return (EOPNOTSUPP); 274 } 275 276 SYSCTL_SETUP(sysctl_vfs_kernfs_setup, "sysctl vfs.kern subtree setup") 277 { 278 279 sysctl_createv(clog, 0, NULL, NULL, 280 CTLFLAG_PERMANENT, 281 CTLTYPE_NODE, "vfs", NULL, 282 NULL, 0, NULL, 0, 283 CTL_VFS, CTL_EOL); 284 sysctl_createv(clog, 0, NULL, NULL, 285 CTLFLAG_PERMANENT, 286 CTLTYPE_NODE, "kernfs", 287 SYSCTL_DESCR("/kern file system"), 288 NULL, 0, NULL, 0, 289 CTL_VFS, 11, CTL_EOL); 290 /* 291 * XXX the "11" above could be dynamic, thereby eliminating one 292 * more instance of the "number to vfs" mapping problem, but 293 * "11" is the order as taken from sys/mount.h 294 */ 295 } 296 297 extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc; 298 299 const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = { 300 &kernfs_vnodeop_opv_desc, 301 NULL, 302 }; 303 304 struct vfsops kernfs_vfsops = { 305 MOUNT_KERNFS, 306 kernfs_mount, 307 kernfs_start, 308 kernfs_unmount, 309 kernfs_root, 310 kernfs_quotactl, 311 kernfs_statvfs, 312 kernfs_sync, 313 kernfs_vget, 314 NULL, /* vfs_fhtovp */ 315 NULL, /* vfs_vptofh */ 316 kernfs_init, 317 kernfs_reinit, 318 kernfs_done, 319 NULL, /* vfs_mountroot */ 320 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 321 vfs_stdextattrctl, 322 kernfs_vnodeopv_descs, 323 0, 324 { NULL, NULL }, 325 }; 326 VFS_ATTACH(kernfs_vfsops); 327
Indexes created Mon Sep 22 13:09:51 GMT 2025