1 /* $NetBSD: filecore_vnops.c,v 1.35 2012/12/20 08:03:42 hannken Exp $ */ 2 3 /*- 4 * Copyright (c) 1994 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * filecore_vnops.c 1.2 1998/8/18 32 */ 33 34 /*- 35 * Copyright (c) 1998 Andrew McMurry 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * filecore_vnops.c 1.2 1998/8/18 66 */ 67 68 #include <sys/cdefs.h> 69 __KERNEL_RCSID(0, "$NetBSD: filecore_vnops.c,v 1.35 2012/12/20 08:03:42 hannken Exp $"); 70 71 #include <sys/param.h> 72 #include <sys/systm.h> 73 #include <sys/namei.h> 74 #include <sys/resourcevar.h> 75 #include <sys/kernel.h> 76 #include <sys/file.h> 77 #include <sys/stat.h> 78 #include <sys/buf.h> 79 #include <sys/proc.h> 80 #include <sys/conf.h> 81 #include <sys/mount.h> 82 #include <sys/vnode.h> 83 #include <sys/malloc.h> 84 #include <sys/dirent.h> 85 #include <sys/kauth.h> 86 87 #include <miscfs/genfs/genfs.h> 88 #include <miscfs/specfs/specdev.h> 89 90 #include <fs/filecorefs/filecore.h> 91 #include <fs/filecorefs/filecore_extern.h> 92 #include <fs/filecorefs/filecore_node.h> 93 94 static int 95 filecore_check_possible(struct vnode *vp, struct filecore_node *ip, 96 mode_t mode) 97 { 98 99 /* 100 * Disallow write attempts unless the file is a socket, 101 * fifo, or a block or character device resident on the 102 * file system. 103 */ 104 if (mode & VWRITE) { 105 switch (vp->v_type) { 106 case VDIR: 107 case VLNK: 108 case VREG: 109 return (EROFS); 110 default: 111 break; 112 } 113 } 114 115 return 0; 116 } 117 118 /* 119 * Check mode permission on inode pointer. Mode is READ, WRITE or EXEC. 120 * The mode is shifted to select the owner/group/other fields. The 121 * super user is granted all permissions. 122 */ 123 static int 124 filecore_check_permitted(struct vnode *vp, struct filecore_node *ip, 125 mode_t mode, kauth_cred_t cred) 126 { 127 struct filecore_mnt *fcmp = ip->i_mnt; 128 129 return kauth_authorize_vnode(cred, kauth_access_action(mode, 130 vp->v_type, filecore_mode(ip)), vp, NULL, 131 genfs_can_access(vp->v_type, filecore_mode(ip), fcmp->fc_uid, 132 fcmp->fc_gid, mode, cred)); 133 } 134 135 int 136 filecore_access(void *v) 137 { 138 struct vop_access_args /* { 139 struct vnode *a_vp; 140 int a_mode; 141 kauth_cred_t a_cred; 142 } */ *ap = v; 143 struct vnode *vp = ap->a_vp; 144 struct filecore_node *ip = VTOI(vp); 145 int error; 146 147 error = filecore_check_possible(vp, ip, ap->a_mode); 148 if (error) 149 return error; 150 151 error = filecore_check_permitted(vp, ip, ap->a_mode, ap->a_cred); 152 153 return error; 154 } 155 156 int 157 filecore_getattr(void *v) 158 { 159 struct vop_getattr_args /* { 160 struct vnode *a_vp; 161 struct vattr *a_vap; 162 kauth_cred_t a_cred; 163 } */ *ap = v; 164 struct vnode *vp = ap->a_vp; 165 struct filecore_node *ip = VTOI(vp); 166 struct vattr *vap = ap->a_vap; 167 struct filecore_mnt *fcmp = ip->i_mnt; 168 169 vap->va_fsid = ip->i_dev; 170 vap->va_fileid = ip->i_number; 171 172 vap->va_mode = filecore_mode(ip); 173 vap->va_nlink = 1; 174 vap->va_uid = fcmp->fc_uid; 175 vap->va_gid = fcmp->fc_gid; 176 vap->va_atime = filecore_time(ip); 177 vap->va_mtime = filecore_time(ip); 178 vap->va_ctime = filecore_time(ip); 179 vap->va_rdev = 0; /* We don't support specials */ 180 181 vap->va_size = (u_quad_t) ip->i_size; 182 vap->va_flags = 0; 183 vap->va_gen = 1; 184 vap->va_blocksize = fcmp->blksize; 185 vap->va_bytes = vap->va_size; 186 vap->va_type = vp->v_type; 187 return (0); 188 } 189 190 /* 191 * Vnode op for reading. 192 */ 193 int 194 filecore_read(void *v) 195 { 196 struct vop_read_args /* { 197 struct vnode *a_vp; 198 struct uio *a_uio; 199 int a_ioflag; 200 kauth_cred_t a_cred; 201 } */ *ap = v; 202 struct vnode *vp = ap->a_vp; 203 struct uio *uio = ap->a_uio; 204 struct filecore_node *ip = VTOI(vp); 205 struct filecore_mnt *fcmp; 206 struct buf *bp; 207 daddr_t lbn, rablock; 208 off_t diff; 209 int error = 0; 210 long size, n, on; 211 212 if (uio->uio_resid == 0) 213 return (0); 214 if (uio->uio_offset < 0) 215 return (EINVAL); 216 if (uio->uio_offset >= ip->i_size) 217 return (0); 218 ip->i_flag |= IN_ACCESS; 219 fcmp = ip->i_mnt; 220 221 if (vp->v_type == VREG) { 222 const int advice = IO_ADV_DECODE(ap->a_ioflag); 223 error = 0; 224 225 while (uio->uio_resid > 0) { 226 vsize_t bytelen = MIN(ip->i_size - uio->uio_offset, 227 uio->uio_resid); 228 229 if (bytelen == 0) { 230 break; 231 } 232 error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice, 233 UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp)); 234 if (error) { 235 break; 236 } 237 } 238 goto out; 239 } 240 241 do { 242 lbn = lblkno(fcmp, uio->uio_offset); 243 on = blkoff(fcmp, uio->uio_offset); 244 n = MIN(blksize(fcmp, ip, lbn) - on, uio->uio_resid); 245 diff = (off_t)ip->i_size - uio->uio_offset; 246 if (diff <= 0) 247 return (0); 248 if (diff < n) 249 n = diff; 250 size = blksize(fcmp, ip, lbn); 251 rablock = lbn + 1; 252 if (ip->i_dirent.attr & FILECORE_ATTR_DIR) { 253 error = filecore_dbread(ip, &bp); 254 on = uio->uio_offset; 255 n = MIN(FILECORE_DIR_SIZE - on, uio->uio_resid); 256 size = FILECORE_DIR_SIZE; 257 } else { 258 error = bread(vp, lbn, size, NOCRED, 0, &bp); 259 #ifdef FILECORE_DEBUG_BR 260 printf("bread(%p, %llx, %ld, CRED, %p)=%d\n", 261 vp, (long long)lbn, size, bp, error); 262 #endif 263 } 264 if (error) { 265 return (error); 266 } 267 n = MIN(n, size - bp->b_resid); 268 269 error = uiomove((char *)(bp->b_data) + on, (int)n, uio); 270 #ifdef FILECORE_DEBUG_BR 271 printf("brelse(%p) vn2\n", bp); 272 #endif 273 brelse(bp, 0); 274 } while (error == 0 && uio->uio_resid > 0 && n != 0); 275 276 out: 277 return (error); 278 } 279 280 /* 281 * Vnode op for readdir 282 */ 283 int 284 filecore_readdir(void *v) 285 { 286 struct vop_readdir_args /* { 287 struct vnode *a_vp; 288 struct uio *a_uio; 289 kauth_cred_t a_cred; 290 int *a_eofflag; 291 off_t **a_cookies; 292 int *a_ncookies; 293 } */ *ap = v; 294 struct uio *uio = ap->a_uio; 295 struct vnode *vdp = ap->a_vp; 296 struct filecore_node *dp; 297 struct filecore_mnt *fcmp; 298 struct buf *bp = NULL; 299 struct dirent *de; 300 struct filecore_direntry *dep = NULL; 301 int error = 0; 302 off_t *cookies = NULL; 303 int ncookies = 0; 304 int i; 305 off_t uiooff; 306 307 dp = VTOI(vdp); 308 309 if ((dp->i_dirent.attr & FILECORE_ATTR_DIR) == 0) 310 return (ENOTDIR); 311 312 if (uio->uio_offset % FILECORE_DIRENT_SIZE != 0) 313 return (EINVAL); 314 i = uio->uio_offset / FILECORE_DIRENT_SIZE; 315 uiooff = uio->uio_offset; 316 317 *ap->a_eofflag = 0; 318 fcmp = dp->i_mnt; 319 320 error = filecore_dbread(dp, &bp); 321 if (error) { 322 return error; 323 } 324 325 if (ap->a_ncookies == NULL) 326 cookies = NULL; 327 else { 328 *ap->a_ncookies = 0; 329 ncookies = uio->uio_resid / _DIRENT_MINSIZE((struct dirent *)0); 330 cookies = malloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 331 } 332 333 de = kmem_zalloc(sizeof(struct dirent), KM_SLEEP); 334 335 for (; ; i++) { 336 switch (i) { 337 case 0: 338 /* Fake the '.' entry */ 339 de->d_fileno = dp->i_number; 340 de->d_type = DT_DIR; 341 de->d_namlen = 1; 342 strlcpy(de->d_name, ".", sizeof(de->d_name)); 343 break; 344 case 1: 345 /* Fake the '..' entry */ 346 de->d_fileno = filecore_getparent(dp); 347 de->d_type = DT_DIR; 348 de->d_namlen = 2; 349 strlcpy(de->d_name, "..", sizeof(de->d_name)); 350 break; 351 default: 352 de->d_fileno = dp->i_dirent.addr + 353 ((i - 2) << FILECORE_INO_INDEX); 354 dep = fcdirentry(bp->b_data, i - 2); 355 if (dep->attr & FILECORE_ATTR_DIR) 356 de->d_type = DT_DIR; 357 else 358 de->d_type = DT_REG; 359 if (filecore_fn2unix(dep->name, de->d_name, 360 /*###346 [cc] warning: passing arg 3 of `filecore_fn2unix' from incompatible pointer type%%%*/ 361 &de->d_namlen)) { 362 *ap->a_eofflag = 1; 363 goto out; 364 } 365 break; 366 } 367 de->d_reclen = _DIRENT_SIZE(de); 368 if (uio->uio_resid < de->d_reclen) 369 goto out; 370 error = uiomove(de, de->d_reclen, uio); 371 if (error) 372 goto out; 373 uiooff += FILECORE_DIRENT_SIZE; 374 375 if (cookies) { 376 *cookies++ = i*FILECORE_DIRENT_SIZE; 377 (*ap->a_ncookies)++; 378 if (--ncookies == 0) goto out; 379 } 380 } 381 out: 382 if (cookies) { 383 *ap->a_cookies = cookies; 384 if (error) { 385 free(cookies, M_TEMP); 386 *ap->a_ncookies = 0; 387 *ap->a_cookies = NULL; 388 } 389 } 390 uio->uio_offset = uiooff; 391 392 #ifdef FILECORE_DEBUG_BR 393 printf("brelse(%p) vn3\n", bp); 394 #endif 395 brelse (bp, 0); 396 397 kmem_free(de, sizeof(*de)); 398 399 return (error); 400 } 401 402 /* 403 * Return target name of a symbolic link 404 * Shouldn't we get the parent vnode and read the data from there? 405 * This could eventually result in deadlocks in filecore_lookup. 406 * But otherwise the block read here is in the block buffer two times. 407 */ 408 int 409 filecore_readlink(void *v) 410 { 411 #if 0 412 struct vop_readlink_args /* { 413 struct vnode *a_vp; 414 struct uio *a_uio; 415 kauth_cred_t a_cred; 416 } */ *ap = v; 417 #endif 418 419 return (EINVAL); 420 } 421 422 int 423 filecore_link(void *v) 424 { 425 struct vop_link_args /* { 426 struct vnode *a_dvp; 427 struct vnode *a_vp; 428 struct componentname *a_cnp; 429 } */ *ap = v; 430 431 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 432 vput(ap->a_dvp); 433 return (EROFS); 434 } 435 436 int 437 filecore_symlink(void *v) 438 { 439 struct vop_symlink_args /* { 440 struct vnode *a_dvp; 441 struct vnode **a_vpp; 442 struct componentname *a_cnp; 443 struct vattr *a_vap; 444 char *a_target; 445 } */ *ap = v; 446 447 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 448 vput(ap->a_dvp); 449 return (EROFS); 450 } 451 452 /* 453 * Calculate the logical to physical mapping if not done already, 454 * then call the device strategy routine. 455 */ 456 int 457 filecore_strategy(void *v) 458 { 459 struct vop_strategy_args /* { 460 struct vnode *a_vp; 461 struct buf *a_bp; 462 } */ *ap = v; 463 struct buf *bp = ap->a_bp; 464 struct vnode *vp = ap->a_vp; 465 struct filecore_node *ip; 466 int error; 467 468 ip = VTOI(vp); 469 if (bp->b_blkno == bp->b_lblkno) { 470 error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL); 471 if (error) { 472 bp->b_error = error; 473 biodone(bp); 474 return (error); 475 } 476 if ((long)bp->b_blkno == -1) 477 clrbuf(bp); 478 } 479 if ((long)bp->b_blkno == -1) { 480 biodone(bp); 481 return (0); 482 } 483 vp = ip->i_devvp; 484 return (VOP_STRATEGY(vp, bp)); 485 } 486 487 /* 488 * Print out the contents of an inode. 489 */ 490 /*ARGSUSED*/ 491 int 492 filecore_print(void *v) 493 { 494 495 printf("tag VT_FILECORE, filecore vnode\n"); 496 return (0); 497 } 498 499 /* 500 * Return POSIX pathconf information applicable to filecore filesystems. 501 */ 502 int 503 filecore_pathconf(void *v) 504 { 505 struct vop_pathconf_args /* { 506 struct vnode *a_vp; 507 int a_name; 508 register_t *a_retval; 509 } */ *ap = v; 510 switch (ap->a_name) { 511 case _PC_LINK_MAX: 512 *ap->a_retval = 1; 513 return (0); 514 case _PC_NAME_MAX: 515 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax; 516 return (0); 517 case _PC_PATH_MAX: 518 *ap->a_retval = 256; 519 return (0); 520 case _PC_CHOWN_RESTRICTED: 521 *ap->a_retval = 1; 522 return (0); 523 case _PC_NO_TRUNC: 524 *ap->a_retval = 1; 525 return (0); 526 case _PC_SYNC_IO: 527 *ap->a_retval = 1; 528 return (0); 529 case _PC_FILESIZEBITS: 530 *ap->a_retval = 32; 531 return (0); 532 default: 533 return (EINVAL); 534 } 535 /* NOTREACHED */ 536 } 537 538 /* 539 * Global vfs data structures for isofs 540 */ 541 #define filecore_create genfs_eopnotsupp 542 #define filecore_mknod genfs_eopnotsupp 543 #define filecore_write genfs_eopnotsupp 544 #define filecore_setattr genfs_eopnotsupp 545 #define filecore_fcntl genfs_fcntl 546 #define filecore_ioctl genfs_enoioctl 547 #define filecore_fsync genfs_nullop 548 #define filecore_remove genfs_eopnotsupp 549 #define filecore_rename genfs_eopnotsupp 550 #define filecore_mkdir genfs_eopnotsupp 551 #define filecore_rmdir genfs_eopnotsupp 552 #define filecore_advlock genfs_eopnotsupp 553 #define filecore_bwrite genfs_eopnotsupp 554 #define filecore_revoke genfs_revoke 555 556 /* 557 * Global vfs data structures for filecore 558 */ 559 int (**filecore_vnodeop_p)(void *); 560 const struct vnodeopv_entry_desc filecore_vnodeop_entries[] = { 561 { &vop_default_desc, vn_default_error }, 562 { &vop_lookup_desc, filecore_lookup }, /* lookup */ 563 { &vop_create_desc, filecore_create }, /* create */ 564 { &vop_mknod_desc, filecore_mknod }, /* mknod */ 565 { &vop_open_desc, filecore_open }, /* open */ 566 { &vop_close_desc, filecore_close }, /* close */ 567 { &vop_access_desc, filecore_access }, /* access */ 568 { &vop_getattr_desc, filecore_getattr }, /* getattr */ 569 { &vop_setattr_desc, filecore_setattr }, /* setattr */ 570 { &vop_read_desc, filecore_read }, /* read */ 571 { &vop_write_desc, filecore_write }, /* write */ 572 { &vop_fcntl_desc, filecore_fcntl }, /* fcntl */ 573 { &vop_ioctl_desc, filecore_ioctl }, /* ioctl */ 574 { &vop_poll_desc, filecore_poll }, /* poll */ 575 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 576 { &vop_revoke_desc, filecore_revoke }, /* revoke */ 577 { &vop_mmap_desc, filecore_mmap }, /* mmap */ 578 { &vop_fsync_desc, filecore_fsync }, /* fsync */ 579 { &vop_seek_desc, filecore_seek }, /* seek */ 580 { &vop_remove_desc, filecore_remove }, /* remove */ 581 { &vop_link_desc, filecore_link }, /* link */ 582 { &vop_rename_desc, filecore_rename }, /* rename */ 583 { &vop_mkdir_desc, filecore_mkdir }, /* mkdir */ 584 { &vop_rmdir_desc, filecore_rmdir }, /* rmdir */ 585 { &vop_symlink_desc, filecore_symlink }, /* symlink */ 586 { &vop_readdir_desc, filecore_readdir }, /* readdir */ 587 { &vop_readlink_desc, filecore_readlink }, /* readlink */ 588 { &vop_abortop_desc, filecore_abortop }, /* abortop */ 589 { &vop_inactive_desc, filecore_inactive }, /* inactive */ 590 { &vop_reclaim_desc, filecore_reclaim }, /* reclaim */ 591 { &vop_lock_desc, genfs_lock }, /* lock */ 592 { &vop_unlock_desc, genfs_unlock }, /* unlock */ 593 { &vop_bmap_desc, filecore_bmap }, /* bmap */ 594 { &vop_strategy_desc, filecore_strategy }, /* strategy */ 595 { &vop_print_desc, filecore_print }, /* print */ 596 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 597 { &vop_pathconf_desc, filecore_pathconf }, /* pathconf */ 598 { &vop_advlock_desc, filecore_advlock }, /* advlock */ 599 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 600 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 601 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 602 { NULL, NULL } 603 }; 604 const struct vnodeopv_desc filecore_vnodeop_opv_desc = 605 { &filecore_vnodeop_p, filecore_vnodeop_entries }; 606