1 /* $NetBSD: filecore_vnops.c,v 1.32 2009/07/03 21:17:40 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 1.32 2009/07/03 21:17:40 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 genfs_can_access(vp->v_type, filecore_mode(ip), 130 fcmp->fc_uid, fcmp->fc_gid, mode, cred); 131 } 132 133 int 134 filecore_access(void *v) 135 { 136 struct vop_access_args /* { 137 struct vnode *a_vp; 138 int a_mode; 139 kauth_cred_t a_cred; 140 } */ *ap = v; 141 struct vnode *vp = ap->a_vp; 142 struct filecore_node *ip = VTOI(vp); 143 int error; 144 145 error = filecore_check_possible(vp, ip, ap->a_mode); 146 if (error) 147 return error; 148 149 error = filecore_check_permitted(vp, ip, ap->a_mode, ap->a_cred); 150 151 return error; 152 } 153 154 int 155 filecore_getattr(void *v) 156 { 157 struct vop_getattr_args /* { 158 struct vnode *a_vp; 159 struct vattr *a_vap; 160 kauth_cred_t a_cred; 161 } */ *ap = v; 162 struct vnode *vp = ap->a_vp; 163 struct filecore_node *ip = VTOI(vp); 164 struct vattr *vap = ap->a_vap; 165 struct filecore_mnt *fcmp = ip->i_mnt; 166 167 vap->va_fsid = ip->i_dev; 168 vap->va_fileid = ip->i_number; 169 170 vap->va_mode = filecore_mode(ip); 171 vap->va_nlink = 1; 172 vap->va_uid = fcmp->fc_uid; 173 vap->va_gid = fcmp->fc_gid; 174 vap->va_atime = filecore_time(ip); 175 vap->va_mtime = filecore_time(ip); 176 vap->va_ctime = filecore_time(ip); 177 vap->va_rdev = 0; /* We don't support specials */ 178 179 vap->va_size = (u_quad_t) ip->i_size; 180 vap->va_flags = 0; 181 vap->va_gen = 1; 182 vap->va_blocksize = fcmp->blksize; 183 vap->va_bytes = vap->va_size; 184 vap->va_type = vp->v_type; 185 return (0); 186 } 187 188 /* 189 * Vnode op for reading. 190 */ 191 int 192 filecore_read(void *v) 193 { 194 struct vop_read_args /* { 195 struct vnode *a_vp; 196 struct uio *a_uio; 197 int a_ioflag; 198 kauth_cred_t a_cred; 199 } */ *ap = v; 200 struct vnode *vp = ap->a_vp; 201 struct uio *uio = ap->a_uio; 202 struct filecore_node *ip = VTOI(vp); 203 struct filecore_mnt *fcmp; 204 struct buf *bp; 205 daddr_t lbn, rablock; 206 off_t diff; 207 int error = 0; 208 long size, n, on; 209 210 if (uio->uio_resid == 0) 211 return (0); 212 if (uio->uio_offset < 0) 213 return (EINVAL); 214 if (uio->uio_offset >= ip->i_size) 215 return (0); 216 ip->i_flag |= IN_ACCESS; 217 fcmp = ip->i_mnt; 218 219 if (vp->v_type == VREG) { 220 const int advice = IO_ADV_DECODE(ap->a_ioflag); 221 error = 0; 222 223 while (uio->uio_resid > 0) { 224 vsize_t bytelen = MIN(ip->i_size - uio->uio_offset, 225 uio->uio_resid); 226 227 if (bytelen == 0) { 228 break; 229 } 230 error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice, 231 UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp)); 232 if (error) { 233 break; 234 } 235 } 236 goto out; 237 } 238 239 do { 240 lbn = lblkno(fcmp, uio->uio_offset); 241 on = blkoff(fcmp, uio->uio_offset); 242 n = MIN(blksize(fcmp, ip, lbn) - on, uio->uio_resid); 243 diff = (off_t)ip->i_size - uio->uio_offset; 244 if (diff <= 0) 245 return (0); 246 if (diff < n) 247 n = diff; 248 size = blksize(fcmp, ip, lbn); 249 rablock = lbn + 1; 250 if (ip->i_dirent.attr & FILECORE_ATTR_DIR) { 251 error = filecore_dbread(ip, &bp); 252 on = uio->uio_offset; 253 n = MIN(FILECORE_DIR_SIZE - on, uio->uio_resid); 254 size = FILECORE_DIR_SIZE; 255 } else { 256 error = bread(vp, lbn, size, NOCRED, 0, &bp); 257 #ifdef FILECORE_DEBUG_BR 258 printf("bread(%p, %llx, %ld, CRED, %p)=%d\n", 259 vp, (long long)lbn, size, bp, error); 260 #endif 261 } 262 n = MIN(n, size - bp->b_resid); 263 if (error) { 264 #ifdef FILECORE_DEBUG_BR 265 printf("brelse(%p) vn1\n", bp); 266 #endif 267 brelse(bp, 0); 268 return (error); 269 } 270 271 error = uiomove((char *)(bp->b_data) + on, (int)n, uio); 272 #ifdef FILECORE_DEBUG_BR 273 printf("brelse(%p) vn2\n", bp); 274 #endif 275 brelse(bp, 0); 276 } while (error == 0 && uio->uio_resid > 0 && n != 0); 277 278 out: 279 return (error); 280 } 281 282 /* 283 * Vnode op for readdir 284 */ 285 int 286 filecore_readdir(void *v) 287 { 288 struct vop_readdir_args /* { 289 struct vnode *a_vp; 290 struct uio *a_uio; 291 kauth_cred_t a_cred; 292 int *a_eofflag; 293 off_t **a_cookies; 294 int *a_ncookies; 295 } */ *ap = v; 296 struct uio *uio = ap->a_uio; 297 struct vnode *vdp = ap->a_vp; 298 struct filecore_node *dp; 299 struct filecore_mnt *fcmp; 300 struct buf *bp = NULL; 301 struct dirent *de; 302 struct filecore_direntry *dep = NULL; 303 int error = 0; 304 off_t *cookies = NULL; 305 int ncookies = 0; 306 int i; 307 off_t uiooff; 308 309 dp = VTOI(vdp); 310 311 if ((dp->i_dirent.attr & FILECORE_ATTR_DIR) == 0) 312 return (ENOTDIR); 313 314 if (uio->uio_offset % FILECORE_DIRENT_SIZE != 0) 315 return (EINVAL); 316 i = uio->uio_offset / FILECORE_DIRENT_SIZE; 317 uiooff = uio->uio_offset; 318 319 *ap->a_eofflag = 0; 320 fcmp = dp->i_mnt; 321 322 error = filecore_dbread(dp, &bp); 323 if (error) { 324 brelse(bp, 0); 325 return error; 326 } 327 328 if (ap->a_ncookies == NULL) 329 cookies = NULL; 330 else { 331 *ap->a_ncookies = 0; 332 ncookies = uio->uio_resid / _DIRENT_MINSIZE((struct dirent *)0); 333 cookies = malloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 334 } 335 336 de = malloc(sizeof(struct dirent), M_FILECORETMP, M_WAITOK | M_ZERO); 337 338 for (; ; i++) { 339 switch (i) { 340 case 0: 341 /* Fake the '.' entry */ 342 de->d_fileno = dp->i_number; 343 de->d_type = DT_DIR; 344 de->d_namlen = 1; 345 strlcpy(de->d_name, ".", sizeof(de->d_name)); 346 break; 347 case 1: 348 /* Fake the '..' entry */ 349 de->d_fileno = filecore_getparent(dp); 350 de->d_type = DT_DIR; 351 de->d_namlen = 2; 352 strlcpy(de->d_name, "..", sizeof(de->d_name)); 353 break; 354 default: 355 de->d_fileno = dp->i_dirent.addr + 356 ((i - 2) << FILECORE_INO_INDEX); 357 dep = fcdirentry(bp->b_data, i - 2); 358 if (dep->attr & FILECORE_ATTR_DIR) 359 de->d_type = DT_DIR; 360 else 361 de->d_type = DT_REG; 362 if (filecore_fn2unix(dep->name, de->d_name, 363 /*###346 [cc] warning: passing arg 3 of `filecore_fn2unix' from incompatible pointer type%%%*/ 364 &de->d_namlen)) { 365 *ap->a_eofflag = 1; 366 goto out; 367 } 368 break; 369 } 370 de->d_reclen = _DIRENT_SIZE(de); 371 if (uio->uio_resid < de->d_reclen) 372 goto out; 373 error = uiomove(de, de->d_reclen, uio); 374 if (error) 375 goto out; 376 uiooff += FILECORE_DIRENT_SIZE; 377 378 if (cookies) { 379 *cookies++ = i*FILECORE_DIRENT_SIZE; 380 (*ap->a_ncookies)++; 381 if (--ncookies == 0) goto out; 382 } 383 } 384 out: 385 if (cookies) { 386 *ap->a_cookies = cookies; 387 if (error) { 388 free(cookies, M_TEMP); 389 *ap->a_ncookies = 0; 390 *ap->a_cookies = NULL; 391 } 392 } 393 uio->uio_offset = uiooff; 394 395 #ifdef FILECORE_DEBUG_BR 396 printf("brelse(%p) vn3\n", bp); 397 #endif 398 brelse (bp, 0); 399 400 free(de, M_FILECORETMP); 401 402 return (error); 403 } 404 405 /* 406 * Return target name of a symbolic link 407 * Shouldn't we get the parent vnode and read the data from there? 408 * This could eventually result in deadlocks in filecore_lookup. 409 * But otherwise the block read here is in the block buffer two times. 410 */ 411 int 412 filecore_readlink(void *v) 413 { 414 #if 0 415 struct vop_readlink_args /* { 416 struct vnode *a_vp; 417 struct uio *a_uio; 418 kauth_cred_t a_cred; 419 } */ *ap = v; 420 #endif 421 422 return (EINVAL); 423 } 424 425 int 426 filecore_link(void *v) 427 { 428 struct vop_link_args /* { 429 struct vnode *a_dvp; 430 struct vnode *a_vp; 431 struct componentname *a_cnp; 432 } */ *ap = v; 433 434 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 435 vput(ap->a_dvp); 436 return (EROFS); 437 } 438 439 int 440 filecore_symlink(void *v) 441 { 442 struct vop_symlink_args /* { 443 struct vnode *a_dvp; 444 struct vnode **a_vpp; 445 struct componentname *a_cnp; 446 struct vattr *a_vap; 447 char *a_target; 448 } */ *ap = v; 449 450 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 451 vput(ap->a_dvp); 452 return (EROFS); 453 } 454 455 /* 456 * Calculate the logical to physical mapping if not done already, 457 * then call the device strategy routine. 458 */ 459 int 460 filecore_strategy(void *v) 461 { 462 struct vop_strategy_args /* { 463 struct vnode *a_vp; 464 struct buf *a_bp; 465 } */ *ap = v; 466 struct buf *bp = ap->a_bp; 467 struct vnode *vp = ap->a_vp; 468 struct filecore_node *ip; 469 int error; 470 471 ip = VTOI(vp); 472 if (bp->b_blkno == bp->b_lblkno) { 473 error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL); 474 if (error) { 475 bp->b_error = error; 476 biodone(bp); 477 return (error); 478 } 479 if ((long)bp->b_blkno == -1) 480 clrbuf(bp); 481 } 482 if ((long)bp->b_blkno == -1) { 483 biodone(bp); 484 return (0); 485 } 486 vp = ip->i_devvp; 487 return (VOP_STRATEGY(vp, bp)); 488 } 489 490 /* 491 * Print out the contents of an inode. 492 */ 493 /*ARGSUSED*/ 494 int 495 filecore_print(void *v) 496 { 497 498 printf("tag VT_FILECORE, filecore vnode\n"); 499 return (0); 500 } 501 502 /* 503 * Return POSIX pathconf information applicable to filecore filesystems. 504 */ 505 int 506 filecore_pathconf(void *v) 507 { 508 struct vop_pathconf_args /* { 509 struct vnode *a_vp; 510 int a_name; 511 register_t *a_retval; 512 } */ *ap = v; 513 switch (ap->a_name) { 514 case _PC_LINK_MAX: 515 *ap->a_retval = 1; 516 return (0); 517 case _PC_NAME_MAX: 518 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax; 519 return (0); 520 case _PC_PATH_MAX: 521 *ap->a_retval = 256; 522 return (0); 523 case _PC_CHOWN_RESTRICTED: 524 *ap->a_retval = 1; 525 return (0); 526 case _PC_NO_TRUNC: 527 *ap->a_retval = 1; 528 return (0); 529 case _PC_SYNC_IO: 530 *ap->a_retval = 1; 531 return (0); 532 case _PC_FILESIZEBITS: 533 *ap->a_retval = 32; 534 return (0); 535 default: 536 return (EINVAL); 537 } 538 /* NOTREACHED */ 539 } 540 541 /* 542 * Global vfs data structures for isofs 543 */ 544 #define filecore_create genfs_eopnotsupp 545 #define filecore_mknod genfs_eopnotsupp 546 #define filecore_write genfs_eopnotsupp 547 #define filecore_setattr genfs_eopnotsupp 548 #define filecore_fcntl genfs_fcntl 549 #define filecore_ioctl genfs_enoioctl 550 #define filecore_fsync genfs_nullop 551 #define filecore_remove genfs_eopnotsupp 552 #define filecore_rename genfs_eopnotsupp 553 #define filecore_mkdir genfs_eopnotsupp 554 #define filecore_rmdir genfs_eopnotsupp 555 #define filecore_advlock genfs_eopnotsupp 556 #define filecore_bwrite genfs_eopnotsupp 557 #define filecore_revoke genfs_revoke 558 559 /* 560 * Global vfs data structures for filecore 561 */ 562 int (**filecore_vnodeop_p)(void *); 563 const struct vnodeopv_entry_desc filecore_vnodeop_entries[] = { 564 { &vop_default_desc, vn_default_error }, 565 { &vop_lookup_desc, filecore_lookup }, /* lookup */ 566 { &vop_create_desc, filecore_create }, /* create */ 567 { &vop_mknod_desc, filecore_mknod }, /* mknod */ 568 { &vop_open_desc, filecore_open }, /* open */ 569 { &vop_close_desc, filecore_close }, /* close */ 570 { &vop_access_desc, filecore_access }, /* access */ 571 { &vop_getattr_desc, filecore_getattr }, /* getattr */ 572 { &vop_setattr_desc, filecore_setattr }, /* setattr */ 573 { &vop_read_desc, filecore_read }, /* read */ 574 { &vop_write_desc, filecore_write }, /* write */ 575 { &vop_fcntl_desc, filecore_fcntl }, /* fcntl */ 576 { &vop_ioctl_desc, filecore_ioctl }, /* ioctl */ 577 { &vop_poll_desc, filecore_poll }, /* poll */ 578 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 579 { &vop_revoke_desc, filecore_revoke }, /* revoke */ 580 { &vop_mmap_desc, filecore_mmap }, /* mmap */ 581 { &vop_fsync_desc, filecore_fsync }, /* fsync */ 582 { &vop_seek_desc, filecore_seek }, /* seek */ 583 { &vop_remove_desc, filecore_remove }, /* remove */ 584 { &vop_link_desc, filecore_link }, /* link */ 585 { &vop_rename_desc, filecore_rename }, /* rename */ 586 { &vop_mkdir_desc, filecore_mkdir }, /* mkdir */ 587 { &vop_rmdir_desc, filecore_rmdir }, /* rmdir */ 588 { &vop_symlink_desc, filecore_symlink }, /* symlink */ 589 { &vop_readdir_desc, filecore_readdir }, /* readdir */ 590 { &vop_readlink_desc, filecore_readlink }, /* readlink */ 591 { &vop_abortop_desc, filecore_abortop }, /* abortop */ 592 { &vop_inactive_desc, filecore_inactive }, /* inactive */ 593 { &vop_reclaim_desc, filecore_reclaim }, /* reclaim */ 594 { &vop_lock_desc, genfs_lock }, /* lock */ 595 { &vop_unlock_desc, genfs_unlock }, /* unlock */ 596 { &vop_bmap_desc, filecore_bmap }, /* bmap */ 597 { &vop_strategy_desc, filecore_strategy }, /* strategy */ 598 { &vop_print_desc, filecore_print }, /* print */ 599 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 600 { &vop_pathconf_desc, filecore_pathconf }, /* pathconf */ 601 { &vop_advlock_desc, filecore_advlock }, /* advlock */ 602 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 603 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 604 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 605 { NULL, NULL } 606 }; 607 const struct vnodeopv_desc filecore_vnodeop_opv_desc = 608 { &filecore_vnodeop_p, filecore_vnodeop_entries }; 609