kernfs_vfsops.c revision 1.83
1 /* $NetBSD: kernfs_vfsops.c,v 1.83 2008/01/28 14:31:18 dholland 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 1.83 2008/01/28 14:31:18 dholland 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/genfs/genfs.h> 62 #include <miscfs/specfs/specdev.h> 63 #include <miscfs/kernfs/kernfs.h> 64 65 MALLOC_JUSTDEFINE(M_KERNFSMNT, "kernfs mount", "kernfs mount structures"); 66 67 dev_t rrootdev = NODEV; 68 69 VFS_PROTOS(kernfs); 70 71 void kernfs_get_rrootdev(void); 72 73 void 74 kernfs_init() 75 { 76 77 malloc_type_attach(M_KERNFSMNT); 78 kernfs_hashinit(); 79 } 80 81 void 82 kernfs_reinit() 83 { 84 kernfs_hashreinit(); 85 } 86 87 void 88 kernfs_done() 89 { 90 91 kernfs_hashdone(); 92 malloc_type_detach(M_KERNFSMNT); 93 } 94 95 void 96 kernfs_get_rrootdev() 97 { 98 static int tried = 0; 99 100 if (tried) { 101 /* Already did it once. */ 102 return; 103 } 104 tried = 1; 105 106 if (rootdev == NODEV) 107 return; 108 rrootdev = devsw_blk2chr(rootdev); 109 if (rrootdev != NODEV) 110 return; 111 rrootdev = NODEV; 112 printf("kernfs_get_rrootdev: no raw root device\n"); 113 } 114 115 /* 116 * Mount the Kernel params filesystem 117 */ 118 int 119 kernfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 120 { 121 struct lwp *l = curlwp; 122 int error = 0; 123 struct kernfs_mount *fmp; 124 125 if (UIO_MX & (UIO_MX - 1)) { 126 log(LOG_ERR, "kernfs: invalid directory entry size"); 127 return (EINVAL); 128 } 129 130 if (mp->mnt_flag & MNT_GETARGS) { 131 *data_len = 0; 132 return 0; 133 } 134 /* 135 * Update is a no-op 136 */ 137 if (mp->mnt_flag & MNT_UPDATE) 138 return (EOPNOTSUPP); 139 140 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount), 141 M_KERNFSMNT, M_WAITOK); 142 memset(fmp, 0, sizeof(*fmp)); 143 TAILQ_INIT(&fmp->nodelist); 144 145 mp->mnt_stat.f_namemax = MAXNAMLEN; 146 mp->mnt_flag |= MNT_LOCAL; 147 mp->mnt_data = fmp; 148 vfs_getnewfsid(mp); 149 150 if ((error = set_statvfs_info(path, UIO_USERSPACE, "kernfs", 151 UIO_SYSSPACE, mp->mnt_op->vfs_name, mp, l)) != 0) { 152 free(fmp, M_KERNFSMNT); 153 return error; 154 } 155 156 kernfs_get_rrootdev(); 157 return 0; 158 } 159 160 int 161 kernfs_start(struct mount *mp, int flags) 162 { 163 164 return (0); 165 } 166 167 int 168 kernfs_unmount(struct mount *mp, int mntflags) 169 { 170 int error; 171 int flags = 0; 172 173 if (mntflags & MNT_FORCE) 174 flags |= FORCECLOSE; 175 176 if ((error = vflush(mp, 0, flags)) != 0) 177 return (error); 178 179 /* 180 * Finally, throw away the kernfs_mount structure 181 */ 182 free(mp->mnt_data, M_KERNFSMNT); 183 mp->mnt_data = NULL; 184 return (0); 185 } 186 187 int 188 kernfs_root(mp, vpp) 189 struct mount *mp; 190 struct vnode **vpp; 191 { 192 193 /* setup "." */ 194 return (kernfs_allocvp(mp, vpp, KFSkern, &kern_targets[0], 0)); 195 } 196 197 int 198 kernfs_statvfs(struct mount *mp, struct statvfs *sbp) 199 { 200 201 sbp->f_bsize = DEV_BSIZE; 202 sbp->f_frsize = DEV_BSIZE; 203 sbp->f_iosize = DEV_BSIZE; 204 sbp->f_blocks = 2; /* 1K to keep df happy */ 205 sbp->f_bfree = 0; 206 sbp->f_bavail = 0; 207 sbp->f_bresvd = 0; 208 sbp->f_files = 1024; /* XXX lie */ 209 sbp->f_ffree = 128; /* XXX lie */ 210 sbp->f_favail = 128; /* XXX lie */ 211 sbp->f_fresvd = 0; 212 copy_statvfs_info(sbp, mp); 213 return (0); 214 } 215 216 /*ARGSUSED*/ 217 int 218 kernfs_sync(struct mount *mp, int waitfor, 219 kauth_cred_t uc) 220 { 221 222 return (0); 223 } 224 225 /* 226 * Kernfs flat namespace lookup. 227 * Currently unsupported. 228 */ 229 int 230 kernfs_vget(struct mount *mp, ino_t ino, 231 struct vnode **vpp) 232 { 233 234 return (EOPNOTSUPP); 235 } 236 237 SYSCTL_SETUP(sysctl_vfs_kernfs_setup, "sysctl vfs.kern subtree setup") 238 { 239 240 sysctl_createv(clog, 0, NULL, NULL, 241 CTLFLAG_PERMANENT, 242 CTLTYPE_NODE, "vfs", NULL, 243 NULL, 0, NULL, 0, 244 CTL_VFS, CTL_EOL); 245 sysctl_createv(clog, 0, NULL, NULL, 246 CTLFLAG_PERMANENT, 247 CTLTYPE_NODE, "kernfs", 248 SYSCTL_DESCR("/kern file system"), 249 NULL, 0, NULL, 0, 250 CTL_VFS, 11, CTL_EOL); 251 /* 252 * XXX the "11" above could be dynamic, thereby eliminating one 253 * more instance of the "number to vfs" mapping problem, but 254 * "11" is the order as taken from sys/mount.h 255 */ 256 } 257 258 extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc; 259 260 const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = { 261 &kernfs_vnodeop_opv_desc, 262 NULL, 263 }; 264 265 struct vfsops kernfs_vfsops = { 266 MOUNT_KERNFS, 267 0, 268 kernfs_mount, 269 kernfs_start, 270 kernfs_unmount, 271 kernfs_root, 272 (void *)eopnotsupp, /* vfs_quotactl */ 273 kernfs_statvfs, 274 kernfs_sync, 275 kernfs_vget, 276 (void *)eopnotsupp, /* vfs_fhtovp */ 277 (void *)eopnotsupp, /* vfs_vptofh */ 278 kernfs_init, 279 kernfs_reinit, 280 kernfs_done, 281 NULL, /* vfs_mountroot */ 282 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 283 vfs_stdextattrctl, 284 (void *)eopnotsupp, /* vfs_suspendctl */ 285 genfs_renamelock_enter, 286 genfs_renamelock_exit, 287 kernfs_vnodeopv_descs, 288 0, 289 { NULL, NULL }, 290 }; 291 VFS_ATTACH(kernfs_vfsops); 292
Indexes created Mon Sep 22 21:09:42 GMT 2025