1 /* $NetBSD: filecore_vnops.c,v 1.34 2012/03/13 18:40:37 elad 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 1.34 2012/03/13 18:40:37 elad 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 n = MIN(n, size - bp->b_resid); 265 if (error) { 266 #ifdef FILECORE_DEBUG_BR 267 printf("brelse(%p) vn1\n", bp); 268 #endif 269 brelse(bp, 0); 270 return (error); 271 } 272 273 error = uiomove((char *)(bp->b_data) + on, (int)n, uio); 274 #ifdef FILECORE_DEBUG_BR 275 printf("brelse(%p) vn2\n", bp); 276 #endif 277 brelse(bp, 0); 278 } while (error == 0 && uio->uio_resid > 0 && n != 0); 279 280 out: 281 return (error); 282 } 283 284 /* 285 * Vnode op for readdir 286 */ 287 int 288 filecore_readdir(void *v) 289 { 290 struct vop_readdir_args /* { 291 struct vnode *a_vp; 292 struct uio *a_uio; 293 kauth_cred_t a_cred; 294 int *a_eofflag; 295 off_t **a_cookies; 296 int *a_ncookies; 297 } */ *ap = v; 298 struct uio *uio = ap->a_uio; 299 struct vnode *vdp = ap->a_vp; 300 struct filecore_node *dp; 301 struct filecore_mnt *fcmp; 302 struct buf *bp = NULL; 303 struct dirent *de; 304 struct filecore_direntry *dep = NULL; 305 int error = 0; 306 off_t *cookies = NULL; 307 int ncookies = 0; 308 int i; 309 off_t uiooff; 310 311 dp = VTOI(vdp); 312 313 if ((dp->i_dirent.attr & FILECORE_ATTR_DIR) == 0) 314 return (ENOTDIR); 315 316 if (uio->uio_offset % FILECORE_DIRENT_SIZE != 0) 317 return (EINVAL); 318 i = uio->uio_offset / FILECORE_DIRENT_SIZE; 319 uiooff = uio->uio_offset; 320 321 *ap->a_eofflag = 0; 322 fcmp = dp->i_mnt; 323 324 error = filecore_dbread(dp, &bp); 325 if (error) { 326 brelse(bp, 0); 327 return error; 328 } 329 330 if (ap->a_ncookies == NULL) 331 cookies = NULL; 332 else { 333 *ap->a_ncookies = 0; 334 ncookies = uio->uio_resid / _DIRENT_MINSIZE((struct dirent *)0); 335 cookies = malloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 336 } 337 338 de = kmem_zalloc(sizeof(struct dirent), KM_SLEEP); 339 340 for (; ; i++) { 341 switch (i) { 342 case 0: 343 /* Fake the '.' entry */ 344 de->d_fileno = dp->i_number; 345 de->d_type = DT_DIR; 346 de->d_namlen = 1; 347 strlcpy(de->d_name, ".", sizeof(de->d_name)); 348 break; 349 case 1: 350 /* Fake the '..' entry */ 351 de->d_fileno = filecore_getparent(dp); 352 de->d_type = DT_DIR; 353 de->d_namlen = 2; 354 strlcpy(de->d_name, "..", sizeof(de->d_name)); 355 break; 356 default: 357 de->d_fileno = dp->i_dirent.addr + 358 ((i - 2) << FILECORE_INO_INDEX); 359 dep = fcdirentry(bp->b_data, i - 2); 360 if (dep->attr & FILECORE_ATTR_DIR) 361 de->d_type = DT_DIR; 362 else 363 de->d_type = DT_REG; 364 if (filecore_fn2unix(dep->name, de->d_name, 365 /*###346 [cc] warning: passing arg 3 of `filecore_fn2unix' from incompatible pointer type%%%*/ 366 &de->d_namlen)) { 367 *ap->a_eofflag = 1; 368 goto out; 369 } 370 break; 371 } 372 de->d_reclen = _DIRENT_SIZE(de); 373 if (uio->uio_resid < de->d_reclen) 374 goto out; 375 error = uiomove(de, de->d_reclen, uio); 376 if (error) 377 goto out; 378 uiooff += FILECORE_DIRENT_SIZE; 379 380 if (cookies) { 381 *cookies++ = i*FILECORE_DIRENT_SIZE; 382 (*ap->a_ncookies)++; 383 if (--ncookies == 0) goto out; 384 } 385 } 386 out: 387 if (cookies) { 388 *ap->a_cookies = cookies; 389 if (error) { 390 free(cookies, M_TEMP); 391 *ap->a_ncookies = 0; 392 *ap->a_cookies = NULL; 393 } 394 } 395 uio->uio_offset = uiooff; 396 397 #ifdef FILECORE_DEBUG_BR 398 printf("brelse(%p) vn3\n", bp); 399 #endif 400 brelse (bp, 0); 401 402 kmem_free(de, sizeof(*de)); 403 404 return (error); 405 } 406 407 /* 408 * Return target name of a symbolic link 409 * Shouldn't we get the parent vnode and read the data from there? 410 * This could eventually result in deadlocks in filecore_lookup. 411 * But otherwise the block read here is in the block buffer two times. 412 */ 413 int 414 filecore_readlink(void *v) 415 { 416 #if 0 417 struct vop_readlink_args /* { 418 struct vnode *a_vp; 419 struct uio *a_uio; 420 kauth_cred_t a_cred; 421 } */ *ap = v; 422 #endif 423 424 return (EINVAL); 425 } 426 427 int 428 filecore_link(void *v) 429 { 430 struct vop_link_args /* { 431 struct vnode *a_dvp; 432 struct vnode *a_vp; 433 struct componentname *a_cnp; 434 } */ *ap = v; 435 436 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 437 vput(ap->a_dvp); 438 return (EROFS); 439 } 440 441 int 442 filecore_symlink(void *v) 443 { 444 struct vop_symlink_args /* { 445 struct vnode *a_dvp; 446 struct vnode **a_vpp; 447 struct componentname *a_cnp; 448 struct vattr *a_vap; 449 char *a_target; 450 } */ *ap = v; 451 452 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 453 vput(ap->a_dvp); 454 return (EROFS); 455 } 456 457 /* 458 * Calculate the logical to physical mapping if not done already, 459 * then call the device strategy routine. 460 */ 461 int 462 filecore_strategy(void *v) 463 { 464 struct vop_strategy_args /* { 465 struct vnode *a_vp; 466 struct buf *a_bp; 467 } */ *ap = v; 468 struct buf *bp = ap->a_bp; 469 struct vnode *vp = ap->a_vp; 470 struct filecore_node *ip; 471 int error; 472 473 ip = VTOI(vp); 474 if (bp->b_blkno == bp->b_lblkno) { 475 error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL); 476 if (error) { 477 bp->b_error = error; 478 biodone(bp); 479 return (error); 480 } 481 if ((long)bp->b_blkno == -1) 482 clrbuf(bp); 483 } 484 if ((long)bp->b_blkno == -1) { 485 biodone(bp); 486 return (0); 487 } 488 vp = ip->i_devvp; 489 return (VOP_STRATEGY(vp, bp)); 490 } 491 492 /* 493 * Print out the contents of an inode. 494 */ 495 /*ARGSUSED*/ 496 int 497 filecore_print(void *v) 498 { 499 500 printf("tag VT_FILECORE, filecore vnode\n"); 501 return (0); 502 } 503 504 /* 505 * Return POSIX pathconf information applicable to filecore filesystems. 506 */ 507 int 508 filecore_pathconf(void *v) 509 { 510 struct vop_pathconf_args /* { 511 struct vnode *a_vp; 512 int a_name; 513 register_t *a_retval; 514 } */ *ap = v; 515 switch (ap->a_name) { 516 case _PC_LINK_MAX: 517 *ap->a_retval = 1; 518 return (0); 519 case _PC_NAME_MAX: 520 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax; 521 return (0); 522 case _PC_PATH_MAX: 523 *ap->a_retval = 256; 524 return (0); 525 case _PC_CHOWN_RESTRICTED: 526 *ap->a_retval = 1; 527 return (0); 528 case _PC_NO_TRUNC: 529 *ap->a_retval = 1; 530 return (0); 531 case _PC_SYNC_IO: 532 *ap->a_retval = 1; 533 return (0); 534 case _PC_FILESIZEBITS: 535 *ap->a_retval = 32; 536 return (0); 537 default: 538 return (EINVAL); 539 } 540 /* NOTREACHED */ 541 } 542 543 /* 544 * Global vfs data structures for isofs 545 */ 546 #define filecore_create genfs_eopnotsupp 547 #define filecore_mknod genfs_eopnotsupp 548 #define filecore_write genfs_eopnotsupp 549 #define filecore_setattr genfs_eopnotsupp 550 #define filecore_fcntl genfs_fcntl 551 #define filecore_ioctl genfs_enoioctl 552 #define filecore_fsync genfs_nullop 553 #define filecore_remove genfs_eopnotsupp 554 #define filecore_rename genfs_eopnotsupp 555 #define filecore_mkdir genfs_eopnotsupp 556 #define filecore_rmdir genfs_eopnotsupp 557 #define filecore_advlock genfs_eopnotsupp 558 #define filecore_bwrite genfs_eopnotsupp 559 #define filecore_revoke genfs_revoke 560 561 /* 562 * Global vfs data structures for filecore 563 */ 564 int (**filecore_vnodeop_p)(void *); 565 const struct vnodeopv_entry_desc filecore_vnodeop_entries[] = { 566 { &vop_default_desc, vn_default_error }, 567 { &vop_lookup_desc, filecore_lookup }, /* lookup */ 568 { &vop_create_desc, filecore_create }, /* create */ 569 { &vop_mknod_desc, filecore_mknod }, /* mknod */ 570 { &vop_open_desc, filecore_open }, /* open */ 571 { &vop_close_desc, filecore_close }, /* close */ 572 { &vop_access_desc, filecore_access }, /* access */ 573 { &vop_getattr_desc, filecore_getattr }, /* getattr */ 574 { &vop_setattr_desc, filecore_setattr }, /* setattr */ 575 { &vop_read_desc, filecore_read }, /* read */ 576 { &vop_write_desc, filecore_write }, /* write */ 577 { &vop_fcntl_desc, filecore_fcntl }, /* fcntl */ 578 { &vop_ioctl_desc, filecore_ioctl }, /* ioctl */ 579 { &vop_poll_desc, filecore_poll }, /* poll */ 580 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 581 { &vop_revoke_desc, filecore_revoke }, /* revoke */ 582 { &vop_mmap_desc, filecore_mmap }, /* mmap */ 583 { &vop_fsync_desc, filecore_fsync }, /* fsync */ 584 { &vop_seek_desc, filecore_seek }, /* seek */ 585 { &vop_remove_desc, filecore_remove }, /* remove */ 586 { &vop_link_desc, filecore_link }, /* link */ 587 { &vop_rename_desc, filecore_rename }, /* rename */ 588 { &vop_mkdir_desc, filecore_mkdir }, /* mkdir */ 589 { &vop_rmdir_desc, filecore_rmdir }, /* rmdir */ 590 { &vop_symlink_desc, filecore_symlink }, /* symlink */ 591 { &vop_readdir_desc, filecore_readdir }, /* readdir */ 592 { &vop_readlink_desc, filecore_readlink }, /* readlink */ 593 { &vop_abortop_desc, filecore_abortop }, /* abortop */ 594 { &vop_inactive_desc, filecore_inactive }, /* inactive */ 595 { &vop_reclaim_desc, filecore_reclaim }, /* reclaim */ 596 { &vop_lock_desc, genfs_lock }, /* lock */ 597 { &vop_unlock_desc, genfs_unlock }, /* unlock */ 598 { &vop_bmap_desc, filecore_bmap }, /* bmap */ 599 { &vop_strategy_desc, filecore_strategy }, /* strategy */ 600 { &vop_print_desc, filecore_print }, /* print */ 601 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 602 { &vop_pathconf_desc, filecore_pathconf }, /* pathconf */ 603 { &vop_advlock_desc, filecore_advlock }, /* advlock */ 604 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 605 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 606 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 607 { NULL, NULL } 608 }; 609 const struct vnodeopv_desc filecore_vnodeop_opv_desc = 610 { &filecore_vnodeop_p, filecore_vnodeop_entries }; 611