kernfs_vnops.c revision 1.63
1 /* $NetBSD: kernfs_vnops.c,v 1.63 1999/03/24 05:51:26 mrg Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)kernfs_vnops.c 8.15 (Berkeley) 5/21/95 39 */ 40 41 /* 42 * Kernel parameter filesystem (/kern) 43 */ 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/kernel.h> 48 #include <sys/vmmeter.h> 49 #include <sys/types.h> 50 #include <sys/time.h> 51 #include <sys/proc.h> 52 #include <sys/vnode.h> 53 #include <sys/malloc.h> 54 #include <sys/file.h> 55 #include <sys/stat.h> 56 #include <sys/mount.h> 57 #include <sys/namei.h> 58 #include <sys/buf.h> 59 #include <sys/dirent.h> 60 #include <sys/msgbuf.h> 61 62 #include <miscfs/genfs/genfs.h> 63 #include <miscfs/kernfs/kernfs.h> 64 65 #include <vm/vm.h> 66 67 #include <uvm/uvm_extern.h> 68 69 #define KSTRING 256 /* Largest I/O available via this filesystem */ 70 #define UIO_MX 32 71 72 #define READ_MODE (S_IRUSR|S_IRGRP|S_IROTH) 73 #define WRITE_MODE (S_IWUSR|S_IRUSR|S_IRGRP|S_IROTH) 74 #define DIR_MODE (S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH) 75 76 struct kern_target kern_targets[] = { 77 /* NOTE: The name must be less than UIO_MX-16 chars in length */ 78 #define N(s) sizeof(s)-1, s 79 /* name data tag type ro/rw */ 80 { DT_DIR, N("."), 0, KTT_NULL, VDIR, DIR_MODE }, 81 { DT_DIR, N(".."), 0, KTT_NULL, VDIR, DIR_MODE }, 82 { DT_REG, N("boottime"), &boottime.tv_sec, KTT_INT, VREG, READ_MODE }, 83 { DT_REG, N("copyright"), copyright, KTT_STRING, VREG, READ_MODE }, 84 { DT_REG, N("hostname"), 0, KTT_HOSTNAME, VREG, WRITE_MODE }, 85 { DT_REG, N("hz"), &hz, KTT_INT, VREG, READ_MODE }, 86 { DT_REG, N("loadavg"), 0, KTT_AVENRUN, VREG, READ_MODE }, 87 { DT_REG, N("msgbuf"), 0, KTT_MSGBUF, VREG, READ_MODE }, 88 { DT_REG, N("pagesize"), &uvmexp.pagesize, KTT_INT, VREG, READ_MODE }, 89 { DT_REG, N("physmem"), &physmem, KTT_INT, VREG, READ_MODE }, 90 #if 0 91 { DT_DIR, N("root"), 0, KTT_NULL, VDIR, DIR_MODE }, 92 #endif 93 { DT_BLK, N("rootdev"), &rootdev, KTT_DEVICE, VBLK, READ_MODE }, 94 { DT_CHR, N("rrootdev"), &rrootdev, KTT_DEVICE, VCHR, READ_MODE }, 95 { DT_REG, N("time"), 0, KTT_TIME, VREG, READ_MODE }, 96 { DT_REG, N("version"), version, KTT_STRING, VREG, READ_MODE }, 97 #undef N 98 }; 99 static int nkern_targets = sizeof(kern_targets) / sizeof(kern_targets[0]); 100 101 int kernfs_lookup __P((void *)); 102 #define kernfs_create genfs_eopnotsupp 103 #define kernfs_mknod genfs_eopnotsupp 104 #define kernfs_open genfs_nullop 105 #define kernfs_close genfs_nullop 106 int kernfs_access __P((void *)); 107 int kernfs_getattr __P((void *)); 108 int kernfs_setattr __P((void *)); 109 int kernfs_read __P((void *)); 110 int kernfs_write __P((void *)); 111 #define kernfs_ioctl genfs_enoioctl 112 #define kernfs_poll genfs_poll 113 #define kernfs_revoke genfs_revoke 114 #define kernfs_mmap genfs_eopnotsupp 115 #define kernfs_fsync genfs_nullop 116 #define kernfs_seek genfs_nullop 117 #define kernfs_remove genfs_eopnotsupp 118 int kernfs_link __P((void *)); 119 #define kernfs_rename genfs_eopnotsupp 120 #define kernfs_mkdir genfs_eopnotsupp 121 #define kernfs_rmdir genfs_eopnotsupp 122 int kernfs_symlink __P((void *)); 123 int kernfs_readdir __P((void *)); 124 #define kernfs_readlink genfs_eopnotsupp 125 #define kernfs_abortop genfs_abortop 126 int kernfs_inactive __P((void *)); 127 int kernfs_reclaim __P((void *)); 128 #define kernfs_lock genfs_nolock 129 #define kernfs_unlock genfs_nounlock 130 #define kernfs_bmap genfs_badop 131 #define kernfs_strategy genfs_badop 132 int kernfs_print __P((void *)); 133 #define kernfs_islocked genfs_noislocked 134 int kernfs_pathconf __P((void *)); 135 #define kernfs_advlock genfs_einval 136 #define kernfs_blkatoff genfs_eopnotsupp 137 #define kernfs_valloc genfs_eopnotsupp 138 #define kernfs_vfree genfs_nullop 139 #define kernfs_truncate genfs_eopnotsupp 140 #define kernfs_update genfs_nullop 141 #define kernfs_bwrite genfs_eopnotsupp 142 143 int kernfs_xread __P((struct kern_target *, int, char **, int)); 144 int kernfs_xwrite __P((struct kern_target *, char *, int)); 145 146 int (**kernfs_vnodeop_p) __P((void *)); 147 struct vnodeopv_entry_desc kernfs_vnodeop_entries[] = { 148 { &vop_default_desc, vn_default_error }, 149 { &vop_lookup_desc, kernfs_lookup }, /* lookup */ 150 { &vop_create_desc, kernfs_create }, /* create */ 151 { &vop_mknod_desc, kernfs_mknod }, /* mknod */ 152 { &vop_open_desc, kernfs_open }, /* open */ 153 { &vop_close_desc, kernfs_close }, /* close */ 154 { &vop_access_desc, kernfs_access }, /* access */ 155 { &vop_getattr_desc, kernfs_getattr }, /* getattr */ 156 { &vop_setattr_desc, kernfs_setattr }, /* setattr */ 157 { &vop_read_desc, kernfs_read }, /* read */ 158 { &vop_write_desc, kernfs_write }, /* write */ 159 { &vop_ioctl_desc, kernfs_ioctl }, /* ioctl */ 160 { &vop_poll_desc, kernfs_poll }, /* poll */ 161 { &vop_revoke_desc, kernfs_revoke }, /* revoke */ 162 { &vop_mmap_desc, kernfs_mmap }, /* mmap */ 163 { &vop_fsync_desc, kernfs_fsync }, /* fsync */ 164 { &vop_seek_desc, kernfs_seek }, /* seek */ 165 { &vop_remove_desc, kernfs_remove }, /* remove */ 166 { &vop_link_desc, kernfs_link }, /* link */ 167 { &vop_rename_desc, kernfs_rename }, /* rename */ 168 { &vop_mkdir_desc, kernfs_mkdir }, /* mkdir */ 169 { &vop_rmdir_desc, kernfs_rmdir }, /* rmdir */ 170 { &vop_symlink_desc, kernfs_symlink }, /* symlink */ 171 { &vop_readdir_desc, kernfs_readdir }, /* readdir */ 172 { &vop_readlink_desc, kernfs_readlink }, /* readlink */ 173 { &vop_abortop_desc, kernfs_abortop }, /* abortop */ 174 { &vop_inactive_desc, kernfs_inactive }, /* inactive */ 175 { &vop_reclaim_desc, kernfs_reclaim }, /* reclaim */ 176 { &vop_lock_desc, kernfs_lock }, /* lock */ 177 { &vop_unlock_desc, kernfs_unlock }, /* unlock */ 178 { &vop_bmap_desc, kernfs_bmap }, /* bmap */ 179 { &vop_strategy_desc, kernfs_strategy }, /* strategy */ 180 { &vop_print_desc, kernfs_print }, /* print */ 181 { &vop_islocked_desc, kernfs_islocked }, /* islocked */ 182 { &vop_pathconf_desc, kernfs_pathconf }, /* pathconf */ 183 { &vop_advlock_desc, kernfs_advlock }, /* advlock */ 184 { &vop_blkatoff_desc, kernfs_blkatoff }, /* blkatoff */ 185 { &vop_valloc_desc, kernfs_valloc }, /* valloc */ 186 { &vop_vfree_desc, kernfs_vfree }, /* vfree */ 187 { &vop_truncate_desc, kernfs_truncate }, /* truncate */ 188 { &vop_update_desc, kernfs_update }, /* update */ 189 { &vop_bwrite_desc, kernfs_bwrite }, /* bwrite */ 190 { (struct vnodeop_desc*)NULL, (int(*) __P((void *)))NULL } 191 }; 192 struct vnodeopv_desc kernfs_vnodeop_opv_desc = 193 { &kernfs_vnodeop_p, kernfs_vnodeop_entries }; 194 195 int 196 kernfs_xread(kt, off, bufp, len) 197 struct kern_target *kt; 198 int off; 199 char **bufp; 200 int len; 201 { 202 203 switch (kt->kt_tag) { 204 case KTT_TIME: { 205 struct timeval tv; 206 207 microtime(&tv); 208 sprintf(*bufp, "%ld %ld\n", tv.tv_sec, tv.tv_usec); 209 break; 210 } 211 212 case KTT_INT: { 213 int *ip = kt->kt_data; 214 215 sprintf(*bufp, "%d\n", *ip); 216 break; 217 } 218 219 case KTT_STRING: { 220 char *cp = kt->kt_data; 221 222 *bufp = cp; 223 break; 224 } 225 226 case KTT_MSGBUF: { 227 long n; 228 229 /* 230 * deal with cases where the message buffer has 231 * become corrupted. 232 */ 233 if (!msgbufenabled || msgbufp->msg_magic != MSG_MAGIC) { 234 msgbufenabled = 0; 235 return (ENXIO); 236 } 237 238 /* 239 * Note that reads of /kern/msgbuf won't necessarily yield 240 * consistent results, if the message buffer is modified 241 * while the read is in progress. The worst that can happen 242 * is that incorrect data will be read. There's no way 243 * that this can crash the system unless the values in the 244 * message buffer header are corrupted, but that'll cause 245 * the system to die anyway. 246 */ 247 if (off >= msgbufp->msg_bufs) 248 return (0); 249 n = msgbufp->msg_bufx + off; 250 if (n >= msgbufp->msg_bufs) 251 n -= msgbufp->msg_bufs; 252 len = min(msgbufp->msg_bufs - n, msgbufp->msg_bufs - off); 253 *bufp = msgbufp->msg_bufc + n; 254 return (len); 255 } 256 257 case KTT_HOSTNAME: { 258 char *cp = hostname; 259 int xlen = hostnamelen; 260 261 if (xlen >= (len-2)) 262 return (EINVAL); 263 264 memcpy(*bufp, cp, xlen); 265 (*bufp)[xlen] = '\n'; 266 (*bufp)[xlen+1] = '\0'; 267 break; 268 } 269 270 case KTT_AVENRUN: 271 averunnable.fscale = FSCALE; 272 sprintf(*bufp, "%d %d %d %ld\n", 273 averunnable.ldavg[0], averunnable.ldavg[1], 274 averunnable.ldavg[2], averunnable.fscale); 275 break; 276 277 default: 278 return (0); 279 } 280 281 len = strlen(*bufp); 282 if (len <= off) 283 return (0); 284 *bufp += off; 285 return (len - off); 286 } 287 288 int 289 kernfs_xwrite(kt, buf, len) 290 struct kern_target *kt; 291 char *buf; 292 int len; 293 { 294 295 switch (kt->kt_tag) { 296 case KTT_HOSTNAME: 297 if (buf[len-1] == '\n') 298 --len; 299 memcpy(hostname, buf, len); 300 hostname[len] = '\0'; 301 hostnamelen = len; 302 return (0); 303 304 default: 305 return (EIO); 306 } 307 } 308 309 310 /* 311 * vp is the current namei directory 312 * ndp is the name to locate in that directory... 313 */ 314 int 315 kernfs_lookup(v) 316 void *v; 317 { 318 struct vop_lookup_args /* { 319 struct vnode * a_dvp; 320 struct vnode ** a_vpp; 321 struct componentname * a_cnp; 322 } */ *ap = v; 323 struct componentname *cnp = ap->a_cnp; 324 struct vnode **vpp = ap->a_vpp; 325 struct vnode *dvp = ap->a_dvp; 326 const char *pname = cnp->cn_nameptr; 327 struct kern_target *kt; 328 struct vnode *fvp; 329 int error, i; 330 331 #ifdef KERNFS_DIAGNOSTIC 332 printf("kernfs_lookup(%p)\n", ap); 333 printf("kernfs_lookup(dp = %p, vpp = %p, cnp = %p)\n", dvp, vpp, ap->a_cnp); 334 printf("kernfs_lookup(%s)\n", pname); 335 #endif 336 337 *vpp = NULLVP; 338 339 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) 340 return (EROFS); 341 342 VOP_UNLOCK(dvp, 0); 343 if (cnp->cn_namelen == 1 && *pname == '.') { 344 *vpp = dvp; 345 VREF(dvp); 346 vn_lock(dvp, LK_SHARED | LK_RETRY); 347 return (0); 348 } 349 350 #if 0 351 if (cnp->cn_namelen == 4 && memcmp(pname, "root", 4) == 0) { 352 *vpp = rootdir; 353 VREF(rootdir); 354 vn_lock(rootdir, LK_SHARED | LK_RETRY); 355 return (0); 356 } 357 #endif 358 359 for (kt = kern_targets, i = 0; i < nkern_targets; kt++, i++) { 360 if (cnp->cn_namelen == kt->kt_namlen && 361 memcmp(kt->kt_name, pname, cnp->cn_namelen) == 0) 362 goto found; 363 } 364 365 #ifdef KERNFS_DIAGNOSTIC 366 printf("kernfs_lookup: i = %d, failed", i); 367 #endif 368 369 vn_lock(dvp, LK_SHARED | LK_RETRY); 370 return (cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS); 371 372 found: 373 if (kt->kt_tag == KTT_DEVICE) { 374 dev_t *dp = kt->kt_data; 375 loop: 376 if (*dp == NODEV || !vfinddev(*dp, kt->kt_vtype, &fvp)) { 377 vn_lock(dvp, LK_SHARED | LK_RETRY); 378 return (ENOENT); 379 } 380 *vpp = fvp; 381 if (vget(fvp, LK_EXCLUSIVE)) 382 goto loop; 383 return (0); 384 } 385 386 #ifdef KERNFS_DIAGNOSTIC 387 printf("kernfs_lookup: allocate new vnode\n"); 388 #endif 389 error = getnewvnode(VT_KERNFS, dvp->v_mount, kernfs_vnodeop_p, &fvp); 390 if (error) { 391 vn_lock(dvp, LK_SHARED | LK_RETRY); 392 return (error); 393 } 394 395 MALLOC(fvp->v_data, void *, sizeof(struct kernfs_node), M_TEMP, 396 M_WAITOK); 397 VTOKERN(fvp)->kf_kt = kt; 398 fvp->v_type = kt->kt_vtype; 399 vn_lock(fvp, LK_SHARED | LK_RETRY); 400 *vpp = fvp; 401 402 #ifdef KERNFS_DIAGNOSTIC 403 printf("kernfs_lookup: newvp = %p\n", fvp); 404 #endif 405 return (0); 406 } 407 408 int 409 kernfs_access(v) 410 void *v; 411 { 412 struct vop_access_args /* { 413 struct vnode *a_vp; 414 int a_mode; 415 struct ucred *a_cred; 416 struct proc *a_p; 417 } */ *ap = v; 418 struct vnode *vp = ap->a_vp; 419 mode_t mode; 420 421 if (vp->v_flag & VROOT) { 422 mode = DIR_MODE; 423 } else { 424 struct kern_target *kt = VTOKERN(vp)->kf_kt; 425 mode = kt->kt_mode; 426 } 427 428 return (vaccess(vp->v_type, mode, (uid_t)0, (gid_t)0, ap->a_mode, 429 ap->a_cred)); 430 } 431 432 int 433 kernfs_getattr(v) 434 void *v; 435 { 436 struct vop_getattr_args /* { 437 struct vnode *a_vp; 438 struct vattr *a_vap; 439 struct ucred *a_cred; 440 struct proc *a_p; 441 } */ *ap = v; 442 struct vnode *vp = ap->a_vp; 443 struct vattr *vap = ap->a_vap; 444 struct timeval tv; 445 int error = 0; 446 char strbuf[KSTRING], *buf; 447 448 memset((caddr_t) vap, 0, sizeof(*vap)); 449 vattr_null(vap); 450 vap->va_uid = 0; 451 vap->va_gid = 0; 452 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 453 vap->va_size = 0; 454 vap->va_blocksize = DEV_BSIZE; 455 microtime(&tv); 456 TIMEVAL_TO_TIMESPEC(&tv, &vap->va_atime); 457 vap->va_mtime = vap->va_atime; 458 vap->va_ctime = vap->va_ctime; 459 vap->va_gen = 0; 460 vap->va_flags = 0; 461 vap->va_rdev = 0; 462 vap->va_bytes = 0; 463 464 if (vp->v_flag & VROOT) { 465 #ifdef KERNFS_DIAGNOSTIC 466 printf("kernfs_getattr: stat rootdir\n"); 467 #endif 468 vap->va_type = VDIR; 469 vap->va_mode = DIR_MODE; 470 vap->va_nlink = 2; 471 vap->va_fileid = 2; 472 vap->va_size = DEV_BSIZE; 473 } else { 474 struct kern_target *kt = VTOKERN(vp)->kf_kt; 475 int nbytes, total; 476 #ifdef KERNFS_DIAGNOSTIC 477 printf("kernfs_getattr: stat target %s\n", kt->kt_name); 478 #endif 479 vap->va_type = kt->kt_vtype; 480 vap->va_mode = kt->kt_mode; 481 vap->va_nlink = 1; 482 vap->va_fileid = 1 + (kt - kern_targets); 483 total = 0; 484 while (buf = strbuf, 485 nbytes = kernfs_xread(kt, total, &buf, sizeof(strbuf))) 486 total += nbytes; 487 vap->va_size = total; 488 } 489 490 #ifdef KERNFS_DIAGNOSTIC 491 printf("kernfs_getattr: return error %d\n", error); 492 #endif 493 return (error); 494 } 495 496 /*ARGSUSED*/ 497 int 498 kernfs_setattr(v) 499 void *v; 500 { 501 /* 502 * Silently ignore attribute changes. 503 * This allows for open with truncate to have no 504 * effect until some data is written. I want to 505 * do it this way because all writes are atomic. 506 */ 507 return (0); 508 } 509 510 int 511 kernfs_read(v) 512 void *v; 513 { 514 struct vop_read_args /* { 515 struct vnode *a_vp; 516 struct uio *a_uio; 517 int a_ioflag; 518 struct ucred *a_cred; 519 } */ *ap = v; 520 struct vnode *vp = ap->a_vp; 521 struct uio *uio = ap->a_uio; 522 struct kern_target *kt; 523 char strbuf[KSTRING], *buf; 524 int off, len; 525 int error; 526 527 if (vp->v_type == VDIR) 528 return (EOPNOTSUPP); 529 530 kt = VTOKERN(vp)->kf_kt; 531 532 #ifdef KERNFS_DIAGNOSTIC 533 printf("kern_read %s\n", kt->kt_name); 534 #endif 535 536 off = uio->uio_offset; 537 #if 0 538 while (buf = strbuf, 539 #else 540 if (buf = strbuf, 541 #endif 542 len = kernfs_xread(kt, off, &buf, sizeof(strbuf))) { 543 if ((error = uiomove(buf, len, uio)) != 0) 544 return (error); 545 off += len; 546 } 547 return (0); 548 } 549 550 int 551 kernfs_write(v) 552 void *v; 553 { 554 struct vop_write_args /* { 555 struct vnode *a_vp; 556 struct uio *a_uio; 557 int a_ioflag; 558 struct ucred *a_cred; 559 } */ *ap = v; 560 struct vnode *vp = ap->a_vp; 561 struct uio *uio = ap->a_uio; 562 struct kern_target *kt; 563 int error, xlen; 564 char strbuf[KSTRING]; 565 566 if (vp->v_type == VDIR) 567 return (EOPNOTSUPP); 568 569 kt = VTOKERN(vp)->kf_kt; 570 571 if (uio->uio_offset != 0) 572 return (EINVAL); 573 574 xlen = min(uio->uio_resid, KSTRING-1); 575 if ((error = uiomove(strbuf, xlen, uio)) != 0) 576 return (error); 577 578 if (uio->uio_resid != 0) 579 return (EIO); 580 581 strbuf[xlen] = '\0'; 582 xlen = strlen(strbuf); 583 return (kernfs_xwrite(kt, strbuf, xlen)); 584 } 585 586 int 587 kernfs_readdir(v) 588 void *v; 589 { 590 struct vop_readdir_args /* { 591 struct vnode *a_vp; 592 struct uio *a_uio; 593 struct ucred *a_cred; 594 int *a_eofflag; 595 off_t **a_cookies; 596 int a_*ncookies; 597 } */ *ap = v; 598 struct uio *uio = ap->a_uio; 599 struct dirent d; 600 struct kern_target *kt; 601 int i; 602 int error; 603 off_t *cookies = NULL; 604 int ncookies = 0, nc = 0; 605 606 if (ap->a_vp->v_type != VDIR) 607 return (ENOTDIR); 608 609 if (uio->uio_resid < UIO_MX) 610 return (EINVAL); 611 if (uio->uio_offset < 0) 612 return (EINVAL); 613 614 error = 0; 615 i = uio->uio_offset; 616 memset((caddr_t)&d, 0, UIO_MX); 617 d.d_reclen = UIO_MX; 618 619 if (ap->a_ncookies) { 620 nc = uio->uio_resid / UIO_MX; 621 nc = min(nc, (nkern_targets - i)); 622 MALLOC(cookies, off_t *, nc * sizeof(off_t), M_TEMP, 623 M_WAITOK); 624 *ap->a_cookies = cookies; 625 } 626 627 for (kt = &kern_targets[i]; 628 uio->uio_resid >= UIO_MX && i < nkern_targets; kt++, i++) { 629 #ifdef KERNFS_DIAGNOSTIC 630 printf("kernfs_readdir: i = %d\n", i); 631 #endif 632 633 if (kt->kt_tag == KTT_DEVICE) { 634 dev_t *dp = kt->kt_data; 635 struct vnode *fvp; 636 637 if (*dp == NODEV || !vfinddev(*dp, kt->kt_vtype, &fvp)) 638 continue; 639 } 640 641 d.d_fileno = i + 3; 642 d.d_namlen = kt->kt_namlen; 643 memcpy(d.d_name, kt->kt_name, kt->kt_namlen + 1); 644 d.d_type = kt->kt_type; 645 646 if ((error = uiomove((caddr_t)&d, UIO_MX, uio)) != 0) 647 break; 648 if (cookies) { 649 *cookies++ = i + 1; 650 ncookies++; 651 } 652 } 653 654 if (ap->a_ncookies) { 655 if (error) { 656 FREE(*ap->a_cookies, M_TEMP); 657 *ap->a_ncookies = 0; 658 *ap->a_cookies = NULL; 659 } else 660 *ap->a_ncookies = ncookies; 661 } 662 663 uio->uio_offset = i; 664 return (error); 665 } 666 667 int 668 kernfs_inactive(v) 669 void *v; 670 { 671 struct vop_inactive_args /* { 672 struct vnode *a_vp; 673 struct proc *a_p; 674 } */ *ap = v; 675 struct vnode *vp = ap->a_vp; 676 677 #ifdef KERNFS_DIAGNOSTIC 678 printf("kernfs_inactive(%p)\n", vp); 679 #endif 680 /* 681 * Clear out the v_type field to avoid 682 * nasty things happening in vgone(). 683 */ 684 VOP_UNLOCK(vp, 0); 685 vp->v_type = VNON; 686 return (0); 687 } 688 689 int 690 kernfs_reclaim(v) 691 void *v; 692 { 693 struct vop_reclaim_args /* { 694 struct vnode *a_vp; 695 } */ *ap = v; 696 struct vnode *vp = ap->a_vp; 697 698 #ifdef KERNFS_DIAGNOSTIC 699 printf("kernfs_reclaim(%p)\n", vp); 700 #endif 701 if (vp->v_data) { 702 FREE(vp->v_data, M_TEMP); 703 vp->v_data = 0; 704 } 705 return (0); 706 } 707 708 /* 709 * Return POSIX pathconf information applicable to special devices. 710 */ 711 int 712 kernfs_pathconf(v) 713 void *v; 714 { 715 struct vop_pathconf_args /* { 716 struct vnode *a_vp; 717 int a_name; 718 register_t *a_retval; 719 } */ *ap = v; 720 721 switch (ap->a_name) { 722 case _PC_LINK_MAX: 723 *ap->a_retval = LINK_MAX; 724 return (0); 725 case _PC_MAX_CANON: 726 *ap->a_retval = MAX_CANON; 727 return (0); 728 case _PC_MAX_INPUT: 729 *ap->a_retval = MAX_INPUT; 730 return (0); 731 case _PC_PIPE_BUF: 732 *ap->a_retval = PIPE_BUF; 733 return (0); 734 case _PC_CHOWN_RESTRICTED: 735 *ap->a_retval = 1; 736 return (0); 737 case _PC_VDISABLE: 738 *ap->a_retval = _POSIX_VDISABLE; 739 return (0); 740 case _PC_SYNC_IO: 741 *ap->a_retval = 1; 742 return (0); 743 default: 744 return (EINVAL); 745 } 746 /* NOTREACHED */ 747 } 748 749 /* 750 * Print out the contents of a /dev/fd vnode. 751 */ 752 /* ARGSUSED */ 753 int 754 kernfs_print(v) 755 void *v; 756 { 757 758 printf("tag VT_KERNFS, kernfs vnode\n"); 759 return (0); 760 } 761 762 int 763 kernfs_link(v) 764 void *v; 765 { 766 struct vop_link_args /* { 767 struct vnode *a_dvp; 768 struct vnode *a_vp; 769 struct componentname *a_cnp; 770 } */ *ap = v; 771 772 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 773 vput(ap->a_dvp); 774 return (EROFS); 775 } 776 777 int 778 kernfs_symlink(v) 779 void *v; 780 { 781 struct vop_symlink_args /* { 782 struct vnode *a_dvp; 783 struct vnode **a_vpp; 784 struct componentname *a_cnp; 785 struct vattr *a_vap; 786 char *a_target; 787 } */ *ap = v; 788 789 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 790 vput(ap->a_dvp); 791 return (EROFS); 792 } 793
Indexes created Wed Oct 01 19:09:53 GMT 2025