kernfs_vfsops.c revision 1.82
1 /* $NetBSD: kernfs_vfsops.c,v 1.82 2007/11/26 19:02:14 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 1.82 2007/11/26 19:02:14 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 VFS_PROTOS(kernfs); 69 70 void kernfs_get_rrootdev(void); 71 72 void 73 kernfs_init() 74 { 75 76 malloc_type_attach(M_KERNFSMNT); 77 kernfs_hashinit(); 78 } 79 80 void 81 kernfs_reinit() 82 { 83 kernfs_hashreinit(); 84 } 85 86 void 87 kernfs_done() 88 { 89 90 kernfs_hashdone(); 91 malloc_type_detach(M_KERNFSMNT); 92 } 93 94 void 95 kernfs_get_rrootdev() 96 { 97 static int tried = 0; 98 99 if (tried) { 100 /* Already did it once. */ 101 return; 102 } 103 tried = 1; 104 105 if (rootdev == NODEV) 106 return; 107 rrootdev = devsw_blk2chr(rootdev); 108 if (rrootdev != NODEV) 109 return; 110 rrootdev = NODEV; 111 printf("kernfs_get_rrootdev: no raw root device\n"); 112 } 113 114 /* 115 * Mount the Kernel params filesystem 116 */ 117 int 118 kernfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 119 { 120 struct lwp *l = curlwp; 121 int error = 0; 122 struct kernfs_mount *fmp; 123 124 if (UIO_MX & (UIO_MX - 1)) { 125 log(LOG_ERR, "kernfs: invalid directory entry size"); 126 return (EINVAL); 127 } 128 129 if (mp->mnt_flag & MNT_GETARGS) { 130 *data_len = 0; 131 return 0; 132 } 133 /* 134 * Update is a no-op 135 */ 136 if (mp->mnt_flag & MNT_UPDATE) 137 return (EOPNOTSUPP); 138 139 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount), 140 M_KERNFSMNT, M_WAITOK); 141 memset(fmp, 0, sizeof(*fmp)); 142 TAILQ_INIT(&fmp->nodelist); 143 144 mp->mnt_stat.f_namemax = MAXNAMLEN; 145 mp->mnt_flag |= MNT_LOCAL; 146 mp->mnt_data = fmp; 147 vfs_getnewfsid(mp); 148 149 if ((error = set_statvfs_info(path, UIO_USERSPACE, "kernfs", 150 UIO_SYSSPACE, mp->mnt_op->vfs_name, mp, l)) != 0) { 151 free(fmp, M_KERNFSMNT); 152 return error; 153 } 154 155 kernfs_get_rrootdev(); 156 return 0; 157 } 158 159 int 160 kernfs_start(struct mount *mp, int flags) 161 { 162 163 return (0); 164 } 165 166 int 167 kernfs_unmount(struct mount *mp, int mntflags) 168 { 169 int error; 170 int flags = 0; 171 172 if (mntflags & MNT_FORCE) 173 flags |= FORCECLOSE; 174 175 if ((error = vflush(mp, 0, flags)) != 0) 176 return (error); 177 178 /* 179 * Finally, throw away the kernfs_mount structure 180 */ 181 free(mp->mnt_data, M_KERNFSMNT); 182 mp->mnt_data = NULL; 183 return (0); 184 } 185 186 int 187 kernfs_root(mp, vpp) 188 struct mount *mp; 189 struct vnode **vpp; 190 { 191 192 /* setup "." */ 193 return (kernfs_allocvp(mp, vpp, KFSkern, &kern_targets[0], 0)); 194 } 195 196 int 197 kernfs_statvfs(struct mount *mp, struct statvfs *sbp) 198 { 199 200 sbp->f_bsize = DEV_BSIZE; 201 sbp->f_frsize = DEV_BSIZE; 202 sbp->f_iosize = DEV_BSIZE; 203 sbp->f_blocks = 2; /* 1K to keep df happy */ 204 sbp->f_bfree = 0; 205 sbp->f_bavail = 0; 206 sbp->f_bresvd = 0; 207 sbp->f_files = 1024; /* XXX lie */ 208 sbp->f_ffree = 128; /* XXX lie */ 209 sbp->f_favail = 128; /* XXX lie */ 210 sbp->f_fresvd = 0; 211 copy_statvfs_info(sbp, mp); 212 return (0); 213 } 214 215 /*ARGSUSED*/ 216 int 217 kernfs_sync(struct mount *mp, int waitfor, 218 kauth_cred_t uc) 219 { 220 221 return (0); 222 } 223 224 /* 225 * Kernfs flat namespace lookup. 226 * Currently unsupported. 227 */ 228 int 229 kernfs_vget(struct mount *mp, ino_t ino, 230 struct vnode **vpp) 231 { 232 233 return (EOPNOTSUPP); 234 } 235 236 SYSCTL_SETUP(sysctl_vfs_kernfs_setup, "sysctl vfs.kern subtree setup") 237 { 238 239 sysctl_createv(clog, 0, NULL, NULL, 240 CTLFLAG_PERMANENT, 241 CTLTYPE_NODE, "vfs", NULL, 242 NULL, 0, NULL, 0, 243 CTL_VFS, CTL_EOL); 244 sysctl_createv(clog, 0, NULL, NULL, 245 CTLFLAG_PERMANENT, 246 CTLTYPE_NODE, "kernfs", 247 SYSCTL_DESCR("/kern file system"), 248 NULL, 0, NULL, 0, 249 CTL_VFS, 11, CTL_EOL); 250 /* 251 * XXX the "11" above could be dynamic, thereby eliminating one 252 * more instance of the "number to vfs" mapping problem, but 253 * "11" is the order as taken from sys/mount.h 254 */ 255 } 256 257 extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc; 258 259 const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = { 260 &kernfs_vnodeop_opv_desc, 261 NULL, 262 }; 263 264 struct vfsops kernfs_vfsops = { 265 MOUNT_KERNFS, 266 0, 267 kernfs_mount, 268 kernfs_start, 269 kernfs_unmount, 270 kernfs_root, 271 (void *)eopnotsupp, /* vfs_quotactl */ 272 kernfs_statvfs, 273 kernfs_sync, 274 kernfs_vget, 275 (void *)eopnotsupp, /* vfs_fhtovp */ 276 (void *)eopnotsupp, /* vfs_vptofh */ 277 kernfs_init, 278 kernfs_reinit, 279 kernfs_done, 280 NULL, /* vfs_mountroot */ 281 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 282 vfs_stdextattrctl, 283 (void *)eopnotsupp, /* vfs_suspendctl */ 284 kernfs_vnodeopv_descs, 285 0, 286 { NULL, NULL }, 287 }; 288 VFS_ATTACH(kernfs_vfsops); 289
Indexes created Wed Sep 24 05:09:52 GMT 2025