kernfs_vfsops.c revision 1.77
1 /* $NetBSD: kernfs_vfsops.c,v 1.77 2007/06/30 09:37:58 pooka 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 1.77 2007/06/30 09:37:58 pooka 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_JUSTDEFINE(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 86 malloc_type_attach(M_KERNFSMNT); 87 kernfs_hashinit(); 88 } 89 90 void 91 kernfs_reinit() 92 { 93 kernfs_hashreinit(); 94 } 95 96 void 97 kernfs_done() 98 { 99 100 kernfs_hashdone(); 101 malloc_type_detach(M_KERNFSMNT); 102 } 103 104 void 105 kernfs_get_rrootdev() 106 { 107 static int tried = 0; 108 109 if (tried) { 110 /* Already did it once. */ 111 return; 112 } 113 tried = 1; 114 115 if (rootdev == NODEV) 116 return; 117 rrootdev = devsw_blk2chr(rootdev); 118 if (rrootdev != NODEV) 119 return; 120 rrootdev = NODEV; 121 printf("kernfs_get_rrootdev: no raw root device\n"); 122 } 123 124 /* 125 * Mount the Kernel params filesystem 126 */ 127 int 128 kernfs_mount(struct mount *mp, const char *path, void *data, 129 struct nameidata *ndp, struct lwp *l) 130 { 131 int error = 0; 132 struct kernfs_mount *fmp; 133 134 if (UIO_MX & (UIO_MX - 1)) { 135 log(LOG_ERR, "kernfs: invalid directory entry size"); 136 return (EINVAL); 137 } 138 139 if (mp->mnt_flag & MNT_GETARGS) 140 return 0; 141 /* 142 * Update is a no-op 143 */ 144 if (mp->mnt_flag & MNT_UPDATE) 145 return (EOPNOTSUPP); 146 147 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount), 148 M_KERNFSMNT, M_WAITOK); 149 memset(fmp, 0, sizeof(*fmp)); 150 TAILQ_INIT(&fmp->nodelist); 151 152 mp->mnt_stat.f_namemax = MAXNAMLEN; 153 mp->mnt_flag |= MNT_LOCAL; 154 mp->mnt_data = fmp; 155 vfs_getnewfsid(mp); 156 157 if ((error = set_statvfs_info(path, UIO_USERSPACE, "kernfs", 158 UIO_SYSSPACE, mp, l)) != 0) { 159 free(fmp, M_KERNFSMNT); 160 return error; 161 } 162 163 kernfs_get_rrootdev(); 164 return 0; 165 } 166 167 int 168 kernfs_start(struct mount *mp, int flags, 169 struct lwp *l) 170 { 171 172 return (0); 173 } 174 175 int 176 kernfs_unmount(struct mount *mp, int mntflags, struct lwp *l) 177 { 178 int error; 179 int flags = 0; 180 181 if (mntflags & MNT_FORCE) 182 flags |= FORCECLOSE; 183 184 if ((error = vflush(mp, 0, flags)) != 0) 185 return (error); 186 187 /* 188 * Finally, throw away the kernfs_mount structure 189 */ 190 free(mp->mnt_data, M_KERNFSMNT); 191 mp->mnt_data = NULL; 192 return (0); 193 } 194 195 int 196 kernfs_root(mp, vpp) 197 struct mount *mp; 198 struct vnode **vpp; 199 { 200 201 /* setup "." */ 202 return (kernfs_allocvp(mp, vpp, KFSkern, &kern_targets[0], 0)); 203 } 204 205 int 206 kernfs_quotactl(struct mount *mp, int cmd, uid_t uid, 207 void *arg, struct lwp *l) 208 { 209 210 return (EOPNOTSUPP); 211 } 212 213 int 214 kernfs_statvfs(struct mount *mp, struct statvfs *sbp, struct lwp *l) 215 { 216 217 sbp->f_bsize = DEV_BSIZE; 218 sbp->f_frsize = DEV_BSIZE; 219 sbp->f_iosize = DEV_BSIZE; 220 sbp->f_blocks = 2; /* 1K to keep df happy */ 221 sbp->f_bfree = 0; 222 sbp->f_bavail = 0; 223 sbp->f_bresvd = 0; 224 sbp->f_files = 1024; /* XXX lie */ 225 sbp->f_ffree = 128; /* XXX lie */ 226 sbp->f_favail = 128; /* XXX lie */ 227 sbp->f_fresvd = 0; 228 copy_statvfs_info(sbp, mp); 229 return (0); 230 } 231 232 /*ARGSUSED*/ 233 int 234 kernfs_sync(struct mount *mp, int waitfor, 235 kauth_cred_t uc, struct lwp *l) 236 { 237 238 return (0); 239 } 240 241 /* 242 * Kernfs flat namespace lookup. 243 * Currently unsupported. 244 */ 245 int 246 kernfs_vget(struct mount *mp, ino_t ino, 247 struct vnode **vpp) 248 { 249 250 return (EOPNOTSUPP); 251 } 252 253 SYSCTL_SETUP(sysctl_vfs_kernfs_setup, "sysctl vfs.kern subtree setup") 254 { 255 256 sysctl_createv(clog, 0, NULL, NULL, 257 CTLFLAG_PERMANENT, 258 CTLTYPE_NODE, "vfs", NULL, 259 NULL, 0, NULL, 0, 260 CTL_VFS, CTL_EOL); 261 sysctl_createv(clog, 0, NULL, NULL, 262 CTLFLAG_PERMANENT, 263 CTLTYPE_NODE, "kernfs", 264 SYSCTL_DESCR("/kern file system"), 265 NULL, 0, NULL, 0, 266 CTL_VFS, 11, CTL_EOL); 267 /* 268 * XXX the "11" above could be dynamic, thereby eliminating one 269 * more instance of the "number to vfs" mapping problem, but 270 * "11" is the order as taken from sys/mount.h 271 */ 272 } 273 274 extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc; 275 276 const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = { 277 &kernfs_vnodeop_opv_desc, 278 NULL, 279 }; 280 281 struct vfsops kernfs_vfsops = { 282 MOUNT_KERNFS, 283 kernfs_mount, 284 kernfs_start, 285 kernfs_unmount, 286 kernfs_root, 287 kernfs_quotactl, 288 kernfs_statvfs, 289 kernfs_sync, 290 kernfs_vget, 291 (void *)eopnotsupp, /* vfs_fhtovp */ 292 (void *)eopnotsupp, /* vfs_vptofh */ 293 kernfs_init, 294 kernfs_reinit, 295 kernfs_done, 296 NULL, /* vfs_mountroot */ 297 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 298 vfs_stdextattrctl, 299 vfs_stdsuspendctl, 300 kernfs_vnodeopv_descs, 301 0, 302 { NULL, NULL }, 303 }; 304 VFS_ATTACH(kernfs_vfsops); 305
Indexes created Tue Sep 23 14:10:03 GMT 2025