kernfs_vnops.c revision 1.15.2.2
1 1.15.2.2 pk /* 2 1.15.2.2 pk * Copyright (c) 1990, 1992 Jan-Simon Pendry 3 1.15.2.2 pk * All rights reserved. 4 1.15.2.2 pk * 5 1.15.2.2 pk * This code is derived from software contributed to Berkeley by 6 1.15.2.2 pk * Jan-Simon Pendry. 7 1.15.2.2 pk * 8 1.15.2.2 pk * Redistribution and use in source and binary forms, with or without 9 1.15.2.2 pk * modification, are permitted provided that the following conditions 10 1.15.2.2 pk * are met: 11 1.15.2.2 pk * 1. Redistributions of source code must retain the above copyright 12 1.15.2.2 pk * notice, this list of conditions and the following disclaimer. 13 1.15.2.2 pk * 2. Redistributions in binary form must reproduce the above copyright 14 1.15.2.2 pk * notice, this list of conditions and the following disclaimer in the 15 1.15.2.2 pk * documentation and/or other materials provided with the distribution. 16 1.15.2.2 pk * 3. All advertising materials mentioning features or use of this software 17 1.15.2.2 pk * must display the following acknowledgement: 18 1.15.2.2 pk * This product includes software developed by the University of 19 1.15.2.2 pk * California, Berkeley and its contributors. 20 1.15.2.2 pk * 4. Neither the name of the University nor the names of its contributors 21 1.15.2.2 pk * may be used to endorse or promote products derived from this software 22 1.15.2.2 pk * without specific prior written permission. 23 1.15.2.2 pk * 24 1.15.2.2 pk * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 1.15.2.2 pk * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 1.15.2.2 pk * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 1.15.2.2 pk * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 1.15.2.2 pk * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 1.15.2.2 pk * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 1.15.2.2 pk * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 1.15.2.2 pk * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 1.15.2.2 pk * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 1.15.2.2 pk * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 1.15.2.2 pk * SUCH DAMAGE. 35 1.15.2.2 pk * 36 1.15.2.2 pk * $Id: kernfs_vnops.c,v 1.15.2.2 1993/12/28 16:35:19 pk Exp $ 37 1.15.2.2 pk */ 38 1.15.2.2 pk 39 1.15.2.2 pk /* 40 1.15.2.2 pk * Kernel parameter filesystem 41 1.15.2.2 pk */ 42 1.15.2.2 pk 43 1.15.2.2 pk #include <sys/param.h> 44 1.15.2.2 pk #include <sys/systm.h> 45 1.15.2.2 pk #include <sys/kernel.h> 46 1.15.2.2 pk #include <sys/types.h> 47 1.15.2.2 pk #include <sys/time.h> 48 1.15.2.2 pk #include <sys/proc.h> 49 1.15.2.2 pk #include <sys/file.h> 50 1.15.2.2 pk #include <sys/vnode.h> 51 1.15.2.2 pk #include <sys/stat.h> 52 1.15.2.2 pk #include <sys/mount.h> 53 1.15.2.2 pk #include <sys/namei.h> 54 1.15.2.2 pk #include <sys/buf.h> 55 1.15.2.2 pk 56 1.15.2.2 pk #include <ufs/dir.h> /* For readdir() XXX */ 57 1.15.2.2 pk 58 1.15.2.2 pk #include <miscfs/kernfs/kernfs.h> 59 1.15.2.2 pk 60 1.15.2.2 pk struct kernfs_target kernfs_targets[] = { 61 1.15.2.2 pk /* NOTE: The name must be less than UIO_MX-16 chars in length */ 62 1.15.2.2 pk DIR_TARGET(".", 0, KTT_NULL, KTM_DIR_PERMS ) 63 1.15.2.2 pk DIR_TARGET("..", 0, KTT_NULL, KTM_DIR_PERMS ) 64 1.15.2.2 pk REG_TARGET("copyright", copyright, KTT_STRING, KTM_RO_PERMS ) 65 1.15.2.2 pk REG_TARGET("hostname", 0, KTT_HOSTNAME, KTM_RW_PERMS ) 66 1.15.2.2 pk REG_TARGET("hz", &hz, KTT_INT, KTM_RO_PERMS ) 67 1.15.2.2 pk REG_TARGET("loadavg", 0, KTT_AVENRUN, KTM_RO_PERMS ) 68 1.15.2.2 pk REG_TARGET("physmem", &physmem, KTT_INT, KTM_RO_PERMS ) 69 1.15.2.2 pk #ifdef KERNFS_HAVE_ROOTDIR 70 1.15.2.2 pk DIR_TARGET("root", 0, KTT_NULL, KTM_DIR_PERMS ) 71 1.15.2.2 pk #endif 72 1.15.2.2 pk BLK_TARGET("rootdev", 0, KTT_NULL, KTM_RO_PERMS ) 73 1.15.2.2 pk CHR_TARGET("rrootdev", 0, KTT_NULL, KTM_RO_PERMS ) 74 1.15.2.2 pk REG_TARGET("time", 0, KTT_TIME, KTM_RO_PERMS ) 75 1.15.2.2 pk REG_TARGET("version", version, KTT_STRING, KTM_RO_PERMS ) 76 1.15.2.2 pk }; 77 1.15.2.2 pk 78 1.15.2.2 pk static int nkernfs_targets = sizeof(kernfs_targets) / sizeof(kernfs_targets[0]); 79 1.15.2.2 pk 80 1.15.2.2 pk static int 81 1.15.2.2 pk kernfs_xread(kt, buf, len, lenp) 82 1.15.2.2 pk struct kernfs_target *kt; 83 1.15.2.2 pk char *buf; 84 1.15.2.2 pk int len; 85 1.15.2.2 pk int *lenp; 86 1.15.2.2 pk { 87 1.15.2.2 pk int xlen; 88 1.15.2.2 pk 89 1.15.2.2 pk switch (kt->kt_tag) { 90 1.15.2.2 pk case KTT_TIME: { 91 1.15.2.2 pk struct timeval tv; 92 1.15.2.2 pk microtime(&tv); 93 1.15.2.2 pk sprintf(buf, "%d %d\n", tv.tv_sec, tv.tv_usec); 94 1.15.2.2 pk break; 95 1.15.2.2 pk } 96 1.15.2.2 pk 97 1.15.2.2 pk case KTT_INT: { 98 1.15.2.2 pk int *ip = kt->kt_data; 99 1.15.2.2 pk sprintf(buf, "%d\n", *ip); 100 1.15.2.2 pk break; 101 1.15.2.2 pk } 102 1.15.2.2 pk 103 1.15.2.2 pk case KTT_STRING: { 104 1.15.2.2 pk char *cp = kt->kt_data; 105 1.15.2.2 pk int xlen = strlen(cp) + 1; 106 1.15.2.2 pk 107 1.15.2.2 pk if (xlen >= len) 108 1.15.2.2 pk return (EINVAL); 109 1.15.2.2 pk 110 1.15.2.2 pk bcopy(cp, buf, xlen); 111 1.15.2.2 pk break; 112 1.15.2.2 pk } 113 1.15.2.2 pk 114 1.15.2.2 pk case KTT_HOSTNAME: { 115 1.15.2.2 pk char *cp = hostname; 116 1.15.2.2 pk int xlen = hostnamelen; 117 1.15.2.2 pk 118 1.15.2.2 pk if (xlen + 2 > len) /* extra space for null and newline */ 119 1.15.2.2 pk return (EINVAL); 120 1.15.2.2 pk 121 1.15.2.2 pk bcopy(cp, buf, xlen); /* safer than sprintf */ 122 1.15.2.2 pk buf[xlen] = '\n'; 123 1.15.2.2 pk buf[xlen+1] = '\0'; 124 1.15.2.2 pk break; 125 1.15.2.2 pk } 126 1.15.2.2 pk 127 1.15.2.2 pk case KTT_AVENRUN: 128 1.15.2.2 pk sprintf(buf, "%d %d %d %d\n", 129 1.15.2.2 pk averunnable.ldavg[0], 130 1.15.2.2 pk averunnable.ldavg[1], 131 1.15.2.2 pk averunnable.ldavg[2], 132 1.15.2.2 pk FSCALE); 133 1.15.2.2 pk break; 134 1.15.2.2 pk 135 1.15.2.2 pk default: 136 1.15.2.2 pk return (EINVAL); 137 1.15.2.2 pk } 138 1.15.2.2 pk 139 1.15.2.2 pk *lenp = strlen(buf); 140 1.15.2.2 pk return (0); 141 1.15.2.2 pk } 142 1.15.2.2 pk 143 1.15.2.2 pk static int 144 1.15.2.2 pk kernfs_xwrite(kt, buf, len) 145 1.15.2.2 pk struct kernfs_target *kt; 146 1.15.2.2 pk char *buf; 147 1.15.2.2 pk int len; 148 1.15.2.2 pk { 149 1.15.2.2 pk switch (kt->kt_tag) { 150 1.15.2.2 pk case KTT_HOSTNAME: { 151 1.15.2.2 pk if (buf[len-1] == '\n') 152 1.15.2.2 pk --len; 153 1.15.2.2 pk bcopy(buf, hostname, len); 154 1.15.2.2 pk /* kernfs_write set buf[value_passed_as_len] = \0. 155 1.15.2.2 pk * therefore, buf len (hostnamelen) = len. 156 1.15.2.2 pk */ 157 1.15.2.2 pk hostnamelen = len; 158 1.15.2.2 pk hostname[hostnamelen] = '\0'; /* null end of string. */ 159 1.15.2.2 pk return (0); 160 1.15.2.2 pk } 161 1.15.2.2 pk 162 1.15.2.2 pk default: 163 1.15.2.2 pk return (EIO); 164 1.15.2.2 pk } 165 1.15.2.2 pk } 166 1.15.2.2 pk 167 1.15.2.2 pk /* 168 1.15.2.2 pk * vp is the current namei directory 169 1.15.2.2 pk * ndp is the name to locate in that directory... 170 1.15.2.2 pk */ 171 1.15.2.2 pk kernfs_lookup(dvp, ndp, p) 172 1.15.2.2 pk struct vnode *dvp; 173 1.15.2.2 pk struct nameidata *ndp; 174 1.15.2.2 pk struct proc *p; 175 1.15.2.2 pk { 176 1.15.2.2 pk char *pname = ndp->ni_ptr; 177 1.15.2.2 pk int error = ENOENT; 178 1.15.2.2 pk int i; 179 1.15.2.2 pk struct vnode *fvp; 180 1.15.2.2 pk 181 1.15.2.2 pk #ifdef KERNFS_DIAGNOSTIC 182 1.15.2.2 pk printf("kernfs_lookup(%s)\n", pname); 183 1.15.2.2 pk #endif 184 1.15.2.2 pk if (ndp->ni_namelen == 1 && *pname == '.') { 185 1.15.2.2 pk ndp->ni_dvp = dvp; 186 1.15.2.2 pk ndp->ni_vp = dvp; 187 1.15.2.2 pk VREF(dvp); 188 1.15.2.2 pk /*VOP_LOCK(dvp);*/ 189 1.15.2.2 pk return (0); 190 1.15.2.2 pk } 191 1.15.2.2 pk 192 1.15.2.2 pk #ifdef KERNFS_HAVE_ROOTDIR 193 1.15.2.2 pk if (ndp->ni_namelen == 4 && bcmp(pname, "root", 4) == 0) { 194 1.15.2.2 pk ndp->ni_dvp = dvp; 195 1.15.2.2 pk ndp->ni_vp = rootdir; 196 1.15.2.2 pk VREF(rootdir); 197 1.15.2.2 pk VOP_LOCK(rootdir); 198 1.15.2.2 pk return (0); 199 1.15.2.2 pk } 200 1.15.2.2 pk #endif 201 1.15.2.2 pk 202 1.15.2.2 pk /* 203 1.15.2.2 pk * /kern/rootdev is the root device 204 1.15.2.2 pk */ 205 1.15.2.2 pk if (ndp->ni_namelen == 7 && bcmp(pname, "rootdev", 7) == 0) { 206 1.15.2.2 pk if (!rootvp) { 207 1.15.2.2 pk error = ENOENT; 208 1.15.2.2 pk goto bad; 209 1.15.2.2 pk } 210 1.15.2.2 pk ndp->ni_dvp = dvp; 211 1.15.2.2 pk ndp->ni_vp = rootvp; 212 1.15.2.2 pk VREF(rootvp); 213 1.15.2.2 pk VOP_LOCK(rootvp); 214 1.15.2.2 pk return (0); 215 1.15.2.2 pk } 216 1.15.2.2 pk 217 1.15.2.2 pk /* 218 1.15.2.2 pk * /kern/rrootdev is the raw root device 219 1.15.2.2 pk */ 220 1.15.2.2 pk if (ndp->ni_namelen == 8 && bcmp(pname, "rrootdev", 7) == 0) { 221 1.15.2.2 pk if (!rrootdevvp) { 222 1.15.2.2 pk error = ENOENT; 223 1.15.2.2 pk goto bad; 224 1.15.2.2 pk } 225 1.15.2.2 pk ndp->ni_dvp = dvp; 226 1.15.2.2 pk ndp->ni_vp = rrootdevvp; 227 1.15.2.2 pk VREF(rrootdevvp); 228 1.15.2.2 pk VOP_LOCK(rrootdevvp); 229 1.15.2.2 pk return (0); 230 1.15.2.2 pk } 231 1.15.2.2 pk 232 1.15.2.2 pk for (i = 0; i < nkernfs_targets; i++) { 233 1.15.2.2 pk struct kernfs_target *kt = &kernfs_targets[i]; 234 1.15.2.2 pk if (ndp->ni_namelen == strlen(kt->kt_name) && 235 1.15.2.2 pk bcmp(kt->kt_name, pname, ndp->ni_namelen) == 0) { 236 1.15.2.2 pk error = 0; 237 1.15.2.2 pk break; 238 1.15.2.2 pk } 239 1.15.2.2 pk } 240 1.15.2.2 pk 241 1.15.2.2 pk #ifdef KERNFS_DIAGNOSTIC 242 1.15.2.2 pk printf("kernfs_lookup: i = %d, error = %d\n", i, error); 243 1.15.2.2 pk #endif 244 1.15.2.2 pk 245 1.15.2.2 pk if (error) 246 1.15.2.2 pk goto bad; 247 1.15.2.2 pk 248 1.15.2.2 pk #ifdef KERNFS_DIAGNOSTIC 249 1.15.2.2 pk printf("kernfs_lookup: allocate new vnode\n"); 250 1.15.2.2 pk #endif 251 1.15.2.2 pk error = getnewvnode(VT_KERNFS, dvp->v_mount, &kernfs_vnodeops, &fvp); 252 1.15.2.2 pk if (error) 253 1.15.2.2 pk goto bad; 254 1.15.2.2 pk VTOKERN(fvp)->kf_kt = &kernfs_targets[i]; 255 1.15.2.2 pk fvp->v_type = VTOKERN(fvp)->kf_kt->kt_vtype; 256 1.15.2.2 pk ndp->ni_dvp = dvp; 257 1.15.2.2 pk ndp->ni_vp = fvp; 258 1.15.2.2 pk #ifdef KERNFS_DIAGNOSTIC 259 1.15.2.2 pk printf("kernfs_lookup: newvp = %x\n", fvp); 260 1.15.2.2 pk #endif 261 1.15.2.2 pk return (0); 262 1.15.2.2 pk 263 1.15.2.2 pk bad:; 264 1.15.2.2 pk ndp->ni_dvp = dvp; 265 1.15.2.2 pk ndp->ni_vp = NULL; 266 1.15.2.2 pk #ifdef KERNFS_DIAGNOSTIC 267 1.15.2.2 pk printf("kernfs_lookup: error = %d\n", error); 268 1.15.2.2 pk #endif 269 1.15.2.2 pk return (error); 270 1.15.2.2 pk } 271 1.15.2.2 pk 272 1.15.2.2 pk kernfs_open(vp, mode, cred, p) 273 1.15.2.2 pk struct vnode *vp; 274 1.15.2.2 pk int mode; 275 1.15.2.2 pk struct ucred *cred; 276 1.15.2.2 pk struct proc *p; 277 1.15.2.2 pk { 278 1.15.2.2 pk /* if access succeeded, this always does, too */ 279 1.15.2.2 pk 280 1.15.2.2 pk return (0); 281 1.15.2.2 pk } 282 1.15.2.2 pk 283 1.15.2.2 pk /* 284 1.15.2.2 pk * Check mode permission on target pointer. Mode is READ, WRITE or EXEC. 285 1.15.2.2 pk * The mode is shifted to select the owner/group/other fields. The 286 1.15.2.2 pk * super user is granted all permissions. 287 1.15.2.2 pk */ 288 1.15.2.2 pk kernfs_access(vp, mode, cred, p) 289 1.15.2.2 pk struct vnode *vp; 290 1.15.2.2 pk register int mode; 291 1.15.2.2 pk struct ucred *cred; 292 1.15.2.2 pk struct proc *p; 293 1.15.2.2 pk { 294 1.15.2.2 pk struct kernfs_target *kt = VTOKERN(vp)->kf_kt; 295 1.15.2.2 pk register gid_t *gp; 296 1.15.2.2 pk int i, error; 297 1.15.2.2 pk 298 1.15.2.2 pk #ifdef KERN_DIAGNOSTIC 299 1.15.2.2 pk if (!VOP_ISLOCKED(vp)) { 300 1.15.2.2 pk vprint("kernfs_access: not locked", vp); 301 1.15.2.2 pk panic("kernfs_access: not locked"); 302 1.15.2.2 pk } 303 1.15.2.2 pk #endif 304 1.15.2.2 pk /* 305 1.15.2.2 pk * If you're the super-user, you always get access. 306 1.15.2.2 pk */ 307 1.15.2.2 pk if (cred->cr_uid == 0) 308 1.15.2.2 pk return (0); 309 1.15.2.2 pk /* 310 1.15.2.2 pk * Access check is based on only one of owner, group, public. 311 1.15.2.2 pk * If not owner, then check group. If not a member of the 312 1.15.2.2 pk * group, then check public access. 313 1.15.2.2 pk */ 314 1.15.2.2 pk if (cred->cr_uid != /* kt->kt_uid XXX */ 0) { 315 1.15.2.2 pk mode >>= 3; 316 1.15.2.2 pk gp = cred->cr_groups; 317 1.15.2.2 pk for (i = 0; i < cred->cr_ngroups; i++, gp++) 318 1.15.2.2 pk if (/* kt->kt_gid XXX */ 0 == *gp) 319 1.15.2.2 pk goto found; 320 1.15.2.2 pk mode >>= 3; 321 1.15.2.2 pk found: 322 1.15.2.2 pk ; 323 1.15.2.2 pk } 324 1.15.2.2 pk if ((kt->kt_perms & mode) == mode) 325 1.15.2.2 pk return (0); 326 1.15.2.2 pk return (EACCES); 327 1.15.2.2 pk } 328 1.15.2.2 pk 329 1.15.2.2 pk kernfs_getattr(vp, vap, cred, p) 330 1.15.2.2 pk struct vnode *vp; 331 1.15.2.2 pk struct vattr *vap; 332 1.15.2.2 pk struct ucred *cred; 333 1.15.2.2 pk struct proc *p; 334 1.15.2.2 pk { 335 1.15.2.2 pk int error = 0; 336 1.15.2.2 pk char strbuf[KSTRING]; 337 1.15.2.2 pk struct kernfs_target *kt = VTOKERN(vp)->kf_kt; 338 1.15.2.2 pk 339 1.15.2.2 pk bzero((caddr_t) vap, sizeof(*vap)); 340 1.15.2.2 pk vattr_null(vap); 341 1.15.2.2 pk vap->va_uid = kt->kt_uid; 342 1.15.2.2 pk vap->va_gid = kt->kt_gid; 343 1.15.2.2 pk vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 344 1.15.2.2 pk /* vap->va_qsize = 0; */ 345 1.15.2.2 pk vap->va_blocksize = DEV_BSIZE; 346 1.15.2.2 pk microtime(&vap->va_atime); 347 1.15.2.2 pk vap->va_mtime = vap->va_atime; 348 1.15.2.2 pk vap->va_ctime = vap->va_ctime; 349 1.15.2.2 pk vap->va_gen = 0; 350 1.15.2.2 pk vap->va_flags = 0; 351 1.15.2.2 pk vap->va_rdev = 0; 352 1.15.2.2 pk /* vap->va_qbytes = 0; */ 353 1.15.2.2 pk vap->va_bytes = 0; 354 1.15.2.2 pk vap->va_type = kt->kt_vtype; 355 1.15.2.2 pk vap->va_mode = kt->kt_perms; 356 1.15.2.2 pk 357 1.15.2.2 pk if (vp->v_flag & VROOT) { 358 1.15.2.2 pk #ifdef KERNFS_DIAGNOSTIC 359 1.15.2.2 pk printf("kernfs_getattr: stat rootdir\n"); 360 1.15.2.2 pk #endif 361 1.15.2.2 pk vap->va_nlink = 2; 362 1.15.2.2 pk vap->va_fileid = 2; 363 1.15.2.2 pk vap->va_size = DEV_BSIZE; 364 1.15.2.2 pk } else { 365 1.15.2.2 pk #ifdef KERNFS_DIAGNOSTIC 366 1.15.2.2 pk printf("kernfs_getattr: stat target %s\n", kt->kt_name); 367 1.15.2.2 pk #endif 368 1.15.2.2 pk vap->va_nlink = 1; 369 1.15.2.2 pk vap->va_fileid = 3 + (kt - kernfs_targets) / sizeof(*kt); 370 1.15.2.2 pk error = kernfs_xread(kt, strbuf, sizeof(strbuf), &vap->va_size); 371 1.15.2.2 pk } 372 1.15.2.2 pk 373 1.15.2.2 pk vp->v_type = vap->va_type; 374 1.15.2.2 pk #ifdef KERNFS_DIAGNOSTIC 375 1.15.2.2 pk printf("kernfs_getattr: return error %d\n", error); 376 1.15.2.2 pk #endif 377 1.15.2.2 pk return (error); 378 1.15.2.2 pk } 379 1.15.2.2 pk 380 1.15.2.2 pk 381 1.15.2.2 pk /* 382 1.15.2.2 pk * Change the mode on a file. 383 1.15.2.2 pk */ 384 1.15.2.2 pk kernfs_chmod1(vp, mode, p) 385 1.15.2.2 pk register struct vnode *vp; 386 1.15.2.2 pk register int mode; 387 1.15.2.2 pk struct proc *p; 388 1.15.2.2 pk { 389 1.15.2.2 pk register struct ucred *cred = p->p_ucred; 390 1.15.2.2 pk register struct kernfs_target *kt = VTOKERN(vp)->kf_kt; 391 1.15.2.2 pk int error; 392 1.15.2.2 pk 393 1.15.2.2 pk if ((mode & kt->kt_maxperms) != mode) /* can't set ro var to rw */ 394 1.15.2.2 pk return (EPERM); 395 1.15.2.2 pk 396 1.15.2.2 pk if (cred->cr_uid != kt->kt_uid && 397 1.15.2.2 pk (error = suser(cred, &p->p_acflag))) 398 1.15.2.2 pk return (error); 399 1.15.2.2 pk if (cred->cr_uid) { 400 1.15.2.2 pk if (vp->v_type != VDIR && (mode & S_ISVTX)) 401 1.15.2.2 pk return (EFTYPE); 402 1.15.2.2 pk if (!groupmember(kt->kt_gid, cred) && (mode & S_ISGID)) 403 1.15.2.2 pk return (EPERM); 404 1.15.2.2 pk } 405 1.15.2.2 pk kt->kt_perms &= ~07777; 406 1.15.2.2 pk kt->kt_perms |= mode & 07777; 407 1.15.2.2 pk /* ip->i_flag |= ICHG;*/ 408 1.15.2.2 pk return (0); 409 1.15.2.2 pk } 410 1.15.2.2 pk 411 1.15.2.2 pk /* 412 1.15.2.2 pk * Perform chown operation on kernfs_target kt 413 1.15.2.2 pk */ 414 1.15.2.2 pk kernfs_chown1(vp, uid, gid, p) 415 1.15.2.2 pk register struct vnode *vp; 416 1.15.2.2 pk uid_t uid; 417 1.15.2.2 pk gid_t gid; 418 1.15.2.2 pk struct proc *p; 419 1.15.2.2 pk { 420 1.15.2.2 pk register struct kernfs_target *kt = VTOKERN(vp)->kf_kt; 421 1.15.2.2 pk register struct ucred *cred = p->p_ucred; 422 1.15.2.2 pk uid_t ouid; 423 1.15.2.2 pk gid_t ogid; 424 1.15.2.2 pk int error = 0; 425 1.15.2.2 pk 426 1.15.2.2 pk if (uid == (u_short)VNOVAL) 427 1.15.2.2 pk uid = kt->kt_uid; 428 1.15.2.2 pk if (gid == (u_short)VNOVAL) 429 1.15.2.2 pk gid = kt->kt_gid; 430 1.15.2.2 pk /* 431 1.15.2.2 pk * If we don't own the file, are trying to change the owner 432 1.15.2.2 pk * of the file, or are not a member of the target group, 433 1.15.2.2 pk * the caller must be superuser or the call fails. 434 1.15.2.2 pk */ 435 1.15.2.2 pk if ((cred->cr_uid != kt->kt_uid || uid != kt->kt_uid || 436 1.15.2.2 pk !groupmember((gid_t)gid, cred)) && 437 1.15.2.2 pk (error = suser(cred, &p->p_acflag))) 438 1.15.2.2 pk return (error); 439 1.15.2.2 pk ouid = kt->kt_uid; 440 1.15.2.2 pk ogid = kt->kt_gid; 441 1.15.2.2 pk 442 1.15.2.2 pk kt->kt_uid = uid; 443 1.15.2.2 pk kt->kt_gid = gid; 444 1.15.2.2 pk 445 1.15.2.2 pk /* if (ouid != uid || ogid != gid) 446 1.15.2.2 pk ip->i_flag |= ICHG;*/ 447 1.15.2.2 pk if (ouid != uid && cred->cr_uid != 0) 448 1.15.2.2 pk kt->kt_perms &= ~S_ISUID; 449 1.15.2.2 pk if (ogid != gid && cred->cr_uid != 0) 450 1.15.2.2 pk kt->kt_perms &= ~S_ISGID; 451 1.15.2.2 pk return (0); 452 1.15.2.2 pk } 453 1.15.2.2 pk 454 1.15.2.2 pk /* 455 1.15.2.2 pk * Set attribute vnode op. called from several syscalls 456 1.15.2.2 pk */ 457 1.15.2.2 pk kernfs_setattr(vp, vap, cred, p) 458 1.15.2.2 pk struct vnode *vp; 459 1.15.2.2 pk struct vattr *vap; 460 1.15.2.2 pk struct ucred *cred; 461 1.15.2.2 pk struct proc *p; 462 1.15.2.2 pk { 463 1.15.2.2 pk int error = 0; 464 1.15.2.2 pk 465 1.15.2.2 pk /* 466 1.15.2.2 pk * Check for unsetable attributes. 467 1.15.2.2 pk */ 468 1.15.2.2 pk if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || 469 1.15.2.2 pk (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || 470 1.15.2.2 pk (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || 471 1.15.2.2 pk ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { 472 1.15.2.2 pk return (EINVAL); 473 1.15.2.2 pk } 474 1.15.2.2 pk /* 475 1.15.2.2 pk * Go through the fields and update iff not VNOVAL. 476 1.15.2.2 pk */ 477 1.15.2.2 pk if (vap->va_uid != (u_short)VNOVAL || vap->va_gid != (u_short)VNOVAL) 478 1.15.2.2 pk if (error = kernfs_chown1(vp, vap->va_uid, vap->va_gid, p)) 479 1.15.2.2 pk return (error); 480 1.15.2.2 pk if (vap->va_size != VNOVAL) { 481 1.15.2.2 pk if (vp->v_type == VDIR) 482 1.15.2.2 pk return (EISDIR); 483 1.15.2.2 pk /* else just nod and smile... */ 484 1.15.2.2 pk } 485 1.15.2.2 pk if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 486 1.15.2.2 pk /* if (cred->cr_uid != ip->i_uid && 487 1.15.2.2 pk (error = suser(cred, &p->p_acflag))) 488 1.15.2.2 pk return (error); 489 1.15.2.2 pk if (vap->va_atime.tv_sec != VNOVAL) 490 1.15.2.2 pk ip->i_flag |= IACC; 491 1.15.2.2 pk if (vap->va_mtime.tv_sec != VNOVAL) 492 1.15.2.2 pk ip->i_flag |= IUPD; 493 1.15.2.2 pk ip->i_flag |= ICHG; 494 1.15.2.2 pk if (error = iupdat(ip, &vap->va_atime, &vap->va_mtime, 1)) 495 1.15.2.2 pk return (error); 496 1.15.2.2 pk */ 497 1.15.2.2 pk } 498 1.15.2.2 pk if (vap->va_mode != (u_short)VNOVAL) 499 1.15.2.2 pk error = kernfs_chmod1(vp, (int)vap->va_mode, p); 500 1.15.2.2 pk if (vap->va_flags != VNOVAL) { 501 1.15.2.2 pk /* if (cred->cr_uid != ip->i_uid && 502 1.15.2.2 pk (error = suser(cred, &p->p_acflag))) 503 1.15.2.2 pk return (error); 504 1.15.2.2 pk if (cred->cr_uid == 0) { 505 1.15.2.2 pk ip->i_flags = vap->va_flags; 506 1.15.2.2 pk } else { 507 1.15.2.2 pk ip->i_flags &= 0xffff0000; 508 1.15.2.2 pk ip->i_flags |= (vap->va_flags & 0xffff); 509 1.15.2.2 pk } 510 1.15.2.2 pk ip->i_flag |= ICHG; 511 1.15.2.2 pk */ 512 1.15.2.2 pk } 513 1.15.2.2 pk return (error); 514 1.15.2.2 pk } 515 1.15.2.2 pk 516 1.15.2.2 pk static int 517 1.15.2.2 pk kernfs_read(vp, uio, ioflag, cred) 518 1.15.2.2 pk struct vnode *vp; 519 1.15.2.2 pk struct uio *uio; 520 1.15.2.2 pk int ioflag; 521 1.15.2.2 pk struct ucred *cred; 522 1.15.2.2 pk { 523 1.15.2.2 pk struct kernfs_target *kt = VTOKERN(vp)->kf_kt; 524 1.15.2.2 pk char strbuf[KSTRING]; 525 1.15.2.2 pk int off = uio->uio_offset; 526 1.15.2.2 pk int len = 0; 527 1.15.2.2 pk char *cp = strbuf; 528 1.15.2.2 pk int error; 529 1.15.2.2 pk #ifdef KERNFS_DIAGNOSTIC 530 1.15.2.2 pk printf("kern_read %s\n", kt->kt_name); 531 1.15.2.2 pk #endif 532 1.15.2.2 pk 533 1.15.2.2 pk error = kernfs_xread(kt, strbuf, sizeof(strbuf), &len); 534 1.15.2.2 pk if (error) 535 1.15.2.2 pk return (error); 536 1.15.2.2 pk cp = strbuf + off; 537 1.15.2.2 pk len -= off; 538 1.15.2.2 pk return (uiomove(cp, len, uio)); 539 1.15.2.2 pk } 540 1.15.2.2 pk 541 1.15.2.2 pk static int 542 1.15.2.2 pk kernfs_write(vp, uio, ioflag, cred) 543 1.15.2.2 pk struct vnode *vp; 544 1.15.2.2 pk struct uio *uio; 545 1.15.2.2 pk int ioflag; 546 1.15.2.2 pk struct ucred *cred; 547 1.15.2.2 pk { 548 1.15.2.2 pk struct kernfs_target *kt = VTOKERN(vp)->kf_kt; 549 1.15.2.2 pk char strbuf[KSTRING]; 550 1.15.2.2 pk int len = uio->uio_resid; 551 1.15.2.2 pk char *cp = strbuf; 552 1.15.2.2 pk int xlen; 553 1.15.2.2 pk int error; 554 1.15.2.2 pk 555 1.15.2.2 pk if (uio->uio_offset != 0) 556 1.15.2.2 pk return (EINVAL); 557 1.15.2.2 pk 558 1.15.2.2 pk xlen = min(uio->uio_resid, KSTRING-1); 559 1.15.2.2 pk error = uiomove(strbuf, xlen, uio); 560 1.15.2.2 pk if (error) 561 1.15.2.2 pk return (error); 562 1.15.2.2 pk 563 1.15.2.2 pk if (uio->uio_resid != 0) 564 1.15.2.2 pk return (EIO); 565 1.15.2.2 pk 566 1.15.2.2 pk strbuf[xlen] = '\0'; 567 1.15.2.2 pk return (kernfs_xwrite(kt, strbuf, xlen)); 568 1.15.2.2 pk } 569 1.15.2.2 pk 570 1.15.2.2 pk kernfs_readdir(vp, uio, cred, eofflagp, cookies, ncookies) 571 1.15.2.2 pk struct vnode *vp; 572 1.15.2.2 pk struct uio *uio; 573 1.15.2.2 pk struct ucred *cred; 574 1.15.2.2 pk int *eofflagp; 575 1.15.2.2 pk u_int *cookies; 576 1.15.2.2 pk int ncookies; 577 1.15.2.2 pk { 578 1.15.2.2 pk struct filedesc *fdp; 579 1.15.2.2 pk int i; 580 1.15.2.2 pk int error; 581 1.15.2.2 pk 582 1.15.2.2 pk i = uio->uio_offset / UIO_MX; 583 1.15.2.2 pk error = 0; 584 1.15.2.2 pk while (uio->uio_resid > 0 && (!cookies || ncookies > 0)) { 585 1.15.2.2 pk #ifdef KERNFS_DIAGNOSTIC 586 1.15.2.2 pk printf("kernfs_readdir: i = %d\n", i); 587 1.15.2.2 pk #endif 588 1.15.2.2 pk if (i >= nkernfs_targets) { 589 1.15.2.2 pk *eofflagp = 1; 590 1.15.2.2 pk break; 591 1.15.2.2 pk } 592 1.15.2.2 pk { 593 1.15.2.2 pk struct direct d; 594 1.15.2.2 pk struct direct *dp = &d; 595 1.15.2.2 pk struct kernfs_target *kt = &kernfs_targets[i]; 596 1.15.2.2 pk 597 1.15.2.2 pk bzero((caddr_t) dp, UIO_MX); 598 1.15.2.2 pk 599 1.15.2.2 pk dp->d_namlen = strlen(kt->kt_name); 600 1.15.2.2 pk bcopy(kt->kt_name, dp->d_name, dp->d_namlen+1); 601 1.15.2.2 pk 602 1.15.2.2 pk #ifdef KERNFS_DIAGNOSTIC 603 1.15.2.2 pk printf("kernfs_readdir: name = %s, len = %d\n", 604 1.15.2.2 pk dp->d_name, dp->d_namlen); 605 1.15.2.2 pk #endif 606 1.15.2.2 pk /* 607 1.15.2.2 pk * Fill in the remaining fields 608 1.15.2.2 pk */ 609 1.15.2.2 pk dp->d_reclen = UIO_MX; 610 1.15.2.2 pk dp->d_ino = i + 3; 611 1.15.2.2 pk /* 612 1.15.2.2 pk * And ship to userland 613 1.15.2.2 pk */ 614 1.15.2.2 pk error = uiomove((caddr_t) dp, UIO_MX, uio); 615 1.15.2.2 pk if (error) 616 1.15.2.2 pk break; 617 1.15.2.2 pk if (cookies) { 618 1.15.2.2 pk *cookies = (i + 1) * UIO_MX; 619 1.15.2.2 pk ncookies--; 620 1.15.2.2 pk } 621 1.15.2.2 pk } 622 1.15.2.2 pk i++; 623 1.15.2.2 pk } 624 1.15.2.2 pk 625 1.15.2.2 pk uio->uio_offset = i * UIO_MX; 626 1.15.2.2 pk 627 1.15.2.2 pk return (error); 628 1.15.2.2 pk } 629 1.15.2.2 pk 630 1.15.2.2 pk kernfs_inactive(vp, p) 631 1.15.2.2 pk struct vnode *vp; 632 1.15.2.2 pk struct proc *p; 633 1.15.2.2 pk { 634 1.15.2.2 pk /* 635 1.15.2.2 pk * Clear out the v_type field to avoid 636 1.15.2.2 pk * nasty things happening in vgone(). 637 1.15.2.2 pk */ 638 1.15.2.2 pk vp->v_type = VNON; 639 1.15.2.2 pk #ifdef KERNFS_DIAGNOSTIC 640 1.15.2.2 pk printf("kernfs_inactive(%x)\n", vp); 641 1.15.2.2 pk #endif 642 1.15.2.2 pk return (0); 643 1.15.2.2 pk } 644 1.15.2.2 pk 645 1.15.2.2 pk /* 646 1.15.2.2 pk * Print out the contents of a kernfs vnode. 647 1.15.2.2 pk */ 648 1.15.2.2 pk /* ARGSUSED */ 649 1.15.2.2 pk void 650 1.15.2.2 pk kernfs_print(vp) 651 1.15.2.2 pk struct vnode *vp; 652 1.15.2.2 pk { 653 1.15.2.2 pk printf("tag VT_KERNFS, kernfs vnode\n"); 654 1.15.2.2 pk } 655 1.15.2.2 pk 656 1.15.2.2 pk /* 657 1.15.2.2 pk * kernfs vnode unsupported operation 658 1.15.2.2 pk */ 659 1.15.2.2 pk kernfs_enotsupp() 660 1.15.2.2 pk { 661 1.15.2.2 pk return (ENODEV); 662 1.15.2.2 pk } 663 1.15.2.2 pk 664 1.15.2.2 pk /* 665 1.15.2.2 pk * kernfs "should never get here" operation 666 1.15.2.2 pk */ 667 1.15.2.2 pk kernfs_badop() 668 1.15.2.2 pk { 669 1.15.2.2 pk panic("kernfs: bad op"); 670 1.15.2.2 pk /* NOTREACHED */ 671 1.15.2.2 pk } 672 1.15.2.2 pk 673 1.15.2.2 pk /* 674 1.15.2.2 pk * kernfs vnode null operation 675 1.15.2.2 pk */ 676 1.15.2.2 pk kernfs_nullop() 677 1.15.2.2 pk { 678 1.15.2.2 pk return (0); 679 1.15.2.2 pk } 680 1.15.2.2 pk 681 1.15.2.2 pk #define kernfs_create ((int (*) __P(( \ 682 1.15.2.2 pk struct nameidata *ndp, \ 683 1.15.2.2 pk struct vattr *vap, \ 684 1.15.2.2 pk struct proc *p))) kernfs_enotsupp) 685 1.15.2.2 pk #define kernfs_mknod ((int (*) __P(( \ 686 1.15.2.2 pk struct nameidata *ndp, \ 687 1.15.2.2 pk struct vattr *vap, \ 688 1.15.2.2 pk struct ucred *cred, \ 689 1.15.2.2 pk struct proc *p))) kernfs_enotsupp) 690 1.15.2.2 pk #define kernfs_close ((int (*) __P(( \ 691 1.15.2.2 pk struct vnode *vp, \ 692 1.15.2.2 pk int fflag, \ 693 1.15.2.2 pk struct ucred *cred, \ 694 1.15.2.2 pk struct proc *p))) nullop) 695 1.15.2.2 pk #define kernfs_ioctl ((int (*) __P(( \ 696 1.15.2.2 pk struct vnode *vp, \ 697 1.15.2.2 pk int command, \ 698 1.15.2.2 pk caddr_t data, \ 699 1.15.2.2 pk int fflag, \ 700 1.15.2.2 pk struct ucred *cred, \ 701 1.15.2.2 pk struct proc *p))) kernfs_enotsupp) 702 1.15.2.2 pk #define kernfs_select ((int (*) __P(( \ 703 1.15.2.2 pk struct vnode *vp, \ 704 1.15.2.2 pk int which, \ 705 1.15.2.2 pk int fflags, \ 706 1.15.2.2 pk struct ucred *cred, \ 707 1.15.2.2 pk struct proc *p))) kernfs_enotsupp) 708 1.15.2.2 pk #define kernfs_mmap ((int (*) __P(( \ 709 1.15.2.2 pk struct vnode *vp, \ 710 1.15.2.2 pk int fflags, \ 711 1.15.2.2 pk struct ucred *cred, \ 712 1.15.2.2 pk struct proc *p))) kernfs_enotsupp) 713 1.15.2.2 pk #define kernfs_fsync ((int (*) __P(( \ 714 1.15.2.2 pk struct vnode *vp, \ 715 1.15.2.2 pk int fflags, \ 716 1.15.2.2 pk struct ucred *cred, \ 717 1.15.2.2 pk int waitfor, \ 718 1.15.2.2 pk struct proc *p))) nullop) 719 1.15.2.2 pk #define kernfs_seek ((int (*) __P(( \ 720 1.15.2.2 pk struct vnode *vp, \ 721 1.15.2.2 pk off_t oldoff, \ 722 1.15.2.2 pk off_t newoff, \ 723 1.15.2.2 pk struct ucred *cred))) nullop) 724 1.15.2.2 pk #define kernfs_remove ((int (*) __P(( \ 725 1.15.2.2 pk struct nameidata *ndp, \ 726 1.15.2.2 pk struct proc *p))) kernfs_enotsupp) 727 1.15.2.2 pk #define kernfs_link ((int (*) __P(( \ 728 1.15.2.2 pk struct vnode *vp, \ 729 1.15.2.2 pk struct nameidata *ndp, \ 730 1.15.2.2 pk struct proc *p))) kernfs_enotsupp) 731 1.15.2.2 pk #define kernfs_rename ((int (*) __P(( \ 732 1.15.2.2 pk struct nameidata *fndp, \ 733 1.15.2.2 pk struct nameidata *tdnp, \ 734 1.15.2.2 pk struct proc *p))) kernfs_enotsupp) 735 1.15.2.2 pk #define kernfs_mkdir ((int (*) __P(( \ 736 1.15.2.2 pk struct nameidata *ndp, \ 737 1.15.2.2 pk struct vattr *vap, \ 738 1.15.2.2 pk struct proc *p))) kernfs_enotsupp) 739 1.15.2.2 pk #define kernfs_rmdir ((int (*) __P(( \ 740 1.15.2.2 pk struct nameidata *ndp, \ 741 1.15.2.2 pk struct proc *p))) kernfs_enotsupp) 742 1.15.2.2 pk #define kernfs_symlink ((int (*) __P(( \ 743 1.15.2.2 pk struct nameidata *ndp, \ 744 1.15.2.2 pk struct vattr *vap, \ 745 1.15.2.2 pk char *target, \ 746 1.15.2.2 pk struct proc *p))) kernfs_enotsupp) 747 1.15.2.2 pk #define kernfs_readlink ((int (*) __P(( \ 748 1.15.2.2 pk struct vnode *vp, \ 749 1.15.2.2 pk struct uio *uio, \ 750 1.15.2.2 pk struct ucred *cred))) kernfs_enotsupp) 751 1.15.2.2 pk #define kernfs_abortop ((int (*) __P(( \ 752 1.15.2.2 pk struct nameidata *ndp))) nullop) 753 1.15.2.2 pk #ifdef KERNFS_DIAGNOSTIC 754 1.15.2.2 pk int kernfs_reclaim(vp) 755 1.15.2.2 pk struct vnode *vp; 756 1.15.2.2 pk { 757 1.15.2.2 pk printf("kernfs_reclaim(%x)\n", vp); 758 1.15.2.2 pk return (0); 759 1.15.2.2 pk } 760 1.15.2.2 pk #else 761 1.15.2.2 pk #define kernfs_reclaim ((int (*) __P(( \ 762 1.15.2.2 pk struct vnode *vp))) nullop) 763 1.15.2.2 pk #endif 764 1.15.2.2 pk #define kernfs_lock ((int (*) __P(( \ 765 1.15.2.2 pk struct vnode *vp))) nullop) 766 1.15.2.2 pk #define kernfs_unlock ((int (*) __P(( \ 767 1.15.2.2 pk struct vnode *vp))) nullop) 768 1.15.2.2 pk #define kernfs_bmap ((int (*) __P(( \ 769 1.15.2.2 pk struct vnode *vp, \ 770 1.15.2.2 pk daddr_t bn, \ 771 1.15.2.2 pk struct vnode **vpp, \ 772 1.15.2.2 pk daddr_t *bnp))) kernfs_badop) 773 1.15.2.2 pk #define kernfs_strategy ((int (*) __P(( \ 774 1.15.2.2 pk struct buf *bp))) kernfs_badop) 775 1.15.2.2 pk #define kernfs_islocked ((int (*) __P(( \ 776 1.15.2.2 pk struct vnode *vp))) nullop) 777 1.15.2.2 pk #define kernfs_advlock ((int (*) __P(( \ 778 1.15.2.2 pk struct vnode *vp, \ 779 1.15.2.2 pk caddr_t id, \ 780 1.15.2.2 pk int op, \ 781 1.15.2.2 pk struct flock *fl, \ 782 1.15.2.2 pk int flags))) kernfs_enotsupp) 783 1.15.2.2 pk 784 1.15.2.2 pk struct vnodeops kernfs_vnodeops = { 785 1.15.2.2 pk kernfs_lookup, /* lookup */ 786 1.15.2.2 pk kernfs_create, /* create */ 787 1.15.2.2 pk kernfs_mknod, /* mknod */ 788 1.15.2.2 pk kernfs_open, /* open */ 789 1.15.2.2 pk kernfs_close, /* close */ 790 1.15.2.2 pk kernfs_access, /* access */ 791 1.15.2.2 pk kernfs_getattr, /* getattr */ 792 1.15.2.2 pk kernfs_setattr, /* setattr */ 793 1.15.2.2 pk kernfs_read, /* read */ 794 1.15.2.2 pk kernfs_write, /* write */ 795 1.15.2.2 pk kernfs_ioctl, /* ioctl */ 796 1.15.2.2 pk kernfs_select, /* select */ 797 1.15.2.2 pk kernfs_mmap, /* mmap */ 798 1.15.2.2 pk kernfs_fsync, /* fsync */ 799 1.15.2.2 pk kernfs_seek, /* seek */ 800 1.15.2.2 pk kernfs_remove, /* remove */ 801 1.15.2.2 pk kernfs_link, /* link */ 802 1.15.2.2 pk kernfs_rename, /* rename */ 803 1.15.2.2 pk kernfs_mkdir, /* mkdir */ 804 1.15.2.2 pk kernfs_rmdir, /* rmdir */ 805 1.15.2.2 pk kernfs_symlink, /* symlink */ 806 1.15.2.2 pk kernfs_readdir, /* readdir */ 807 1.15.2.2 pk kernfs_readlink, /* readlink */ 808 1.15.2.2 pk kernfs_abortop, /* abortop */ 809 1.15.2.2 pk kernfs_inactive, /* inactive */ 810 1.15.2.2 pk kernfs_reclaim, /* reclaim */ 811 1.15.2.2 pk kernfs_lock, /* lock */ 812 1.15.2.2 pk kernfs_unlock, /* unlock */ 813 1.15.2.2 pk kernfs_bmap, /* bmap */ 814 1.15.2.2 pk kernfs_strategy, /* strategy */ 815 1.15.2.2 pk kernfs_print, /* print */ 816 1.15.2.2 pk kernfs_islocked, /* islocked */ 817 1.15.2.2 pk kernfs_advlock, /* advlock */ 818 1.15.2.2 pk }; 819
Indexes created Wed Oct 01 19:09:53 GMT 2025