1 /* $NetBSD: filecore_vnops.c,v 1.18 2006/05/15 01:29:02 christos 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 1.18 2006/05/15 01:29:02 christos 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 /* 95 * Check mode permission on inode pointer. Mode is READ, WRITE or EXEC. 96 * The mode is shifted to select the owner/group/other fields. The 97 * super user is granted all permissions. 98 */ 99 int 100 filecore_access(v) 101 void *v; 102 { 103 struct vop_access_args /* { 104 struct vnode *a_vp; 105 int a_mode; 106 kauth_cred_t a_cred; 107 struct lwp *a_l; 108 } */ *ap = v; 109 struct vnode *vp = ap->a_vp; 110 struct filecore_node *ip = VTOI(vp); 111 struct filecore_mnt *fcmp = ip->i_mnt; 112 113 /* 114 * Disallow write attempts unless the file is a socket, 115 * fifo, or a block or character device resident on the 116 * file system. 117 */ 118 if (ap->a_mode & VWRITE) { 119 switch (vp->v_type) { 120 case VDIR: 121 case VLNK: 122 case VREG: 123 return (EROFS); 124 default: 125 break; 126 } 127 } 128 129 return (vaccess(vp->v_type, filecore_mode(ip), 130 fcmp->fc_uid, fcmp->fc_gid, ap->a_mode, ap->a_cred)); 131 } 132 133 int 134 filecore_getattr(v) 135 void *v; 136 { 137 struct vop_getattr_args /* { 138 struct vnode *a_vp; 139 struct vattr *a_vap; 140 kauth_cred_t a_cred; 141 struct lwp *a_l; 142 } */ *ap = v; 143 struct vnode *vp = ap->a_vp; 144 struct filecore_node *ip = VTOI(vp); 145 struct vattr *vap = ap->a_vap; 146 struct filecore_mnt *fcmp = ip->i_mnt; 147 148 vap->va_fsid = ip->i_dev; 149 vap->va_fileid = ip->i_number; 150 151 vap->va_mode = filecore_mode(ip); 152 vap->va_nlink = 1; 153 vap->va_uid = fcmp->fc_uid; 154 vap->va_gid = fcmp->fc_gid; 155 vap->va_atime = filecore_time(ip); 156 vap->va_mtime = filecore_time(ip); 157 vap->va_ctime = filecore_time(ip); 158 vap->va_rdev = 0; /* We don't support specials */ 159 160 vap->va_size = (u_quad_t) ip->i_size; 161 vap->va_flags = 0; 162 vap->va_gen = 1; 163 vap->va_blocksize = fcmp->blksize; 164 vap->va_bytes = vap->va_size; 165 vap->va_type = vp->v_type; 166 return (0); 167 } 168 169 /* 170 * Vnode op for reading. 171 */ 172 int 173 filecore_read(v) 174 void *v; 175 { 176 struct vop_read_args /* { 177 struct vnode *a_vp; 178 struct uio *a_uio; 179 int a_ioflag; 180 kauth_cred_t a_cred; 181 } */ *ap = v; 182 struct vnode *vp = ap->a_vp; 183 struct uio *uio = ap->a_uio; 184 struct filecore_node *ip = VTOI(vp); 185 struct filecore_mnt *fcmp; 186 struct buf *bp; 187 daddr_t lbn, rablock; 188 off_t diff; 189 int error = 0; 190 long size, n, on; 191 192 if (uio->uio_resid == 0) 193 return (0); 194 if (uio->uio_offset < 0) 195 return (EINVAL); 196 if (uio->uio_offset >= ip->i_size) 197 return (0); 198 ip->i_flag |= IN_ACCESS; 199 fcmp = ip->i_mnt; 200 201 if (vp->v_type == VREG) { 202 const int advice = IO_ADV_DECODE(ap->a_ioflag); 203 error = 0; 204 205 while (uio->uio_resid > 0) { 206 void *win; 207 int flags; 208 vsize_t bytelen = MIN(ip->i_size - uio->uio_offset, 209 uio->uio_resid); 210 211 if (bytelen == 0) { 212 break; 213 } 214 win = ubc_alloc(&vp->v_uobj, uio->uio_offset, 215 &bytelen, advice, UBC_READ); 216 error = uiomove(win, bytelen, uio); 217 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 218 ubc_release(win, flags); 219 if (error) { 220 break; 221 } 222 } 223 goto out; 224 } 225 226 do { 227 lbn = lblkno(fcmp, uio->uio_offset); 228 on = blkoff(fcmp, uio->uio_offset); 229 n = MIN(blksize(fcmp, ip, lbn) - on, uio->uio_resid); 230 diff = (off_t)ip->i_size - uio->uio_offset; 231 if (diff <= 0) 232 return (0); 233 if (diff < n) 234 n = diff; 235 size = blksize(fcmp, ip, lbn); 236 rablock = lbn + 1; 237 if (ip->i_dirent.attr & FILECORE_ATTR_DIR) { 238 error = filecore_dbread(ip, &bp); 239 on = uio->uio_offset; 240 n = MIN(FILECORE_DIR_SIZE - on, uio->uio_resid); 241 size = FILECORE_DIR_SIZE; 242 } else { 243 error = bread(vp, lbn, size, NOCRED, &bp); 244 #ifdef FILECORE_DEBUG_BR 245 printf("bread(%p, %x, %ld, CRED, %p)=%d\n", 246 vp, lbn, size, bp, error); 247 #endif 248 } 249 n = MIN(n, size - bp->b_resid); 250 if (error) { 251 #ifdef FILECORE_DEBUG_BR 252 printf("brelse(%p) vn1\n", bp); 253 #endif 254 brelse(bp); 255 return (error); 256 } 257 258 error = uiomove(bp->b_data + on, (int)n, uio); 259 #ifdef FILECORE_DEBUG_BR 260 printf("brelse(%p) vn2\n", bp); 261 #endif 262 brelse(bp); 263 } while (error == 0 && uio->uio_resid > 0 && n != 0); 264 265 out: 266 return (error); 267 } 268 269 /* 270 * Vnode op for readdir 271 */ 272 int 273 filecore_readdir(v) 274 void *v; 275 { 276 struct vop_readdir_args /* { 277 struct vnode *a_vp; 278 struct uio *a_uio; 279 kauth_cred_t a_cred; 280 int *a_eofflag; 281 off_t **a_cookies; 282 int *a_ncookies; 283 } */ *ap = v; 284 struct uio *uio = ap->a_uio; 285 struct vnode *vdp = ap->a_vp; 286 struct filecore_node *dp; 287 struct filecore_mnt *fcmp; 288 struct buf *bp = NULL; 289 struct dirent de; 290 struct filecore_direntry *dep = NULL; 291 int error = 0; 292 off_t *cookies = NULL; 293 int ncookies = 0; 294 int i; 295 off_t uiooff; 296 297 dp = VTOI(vdp); 298 299 if ((dp->i_dirent.attr & FILECORE_ATTR_DIR) == 0) 300 return (ENOTDIR); 301 302 if (uio->uio_offset % FILECORE_DIRENT_SIZE != 0) 303 return (EINVAL); 304 i = uio->uio_offset / FILECORE_DIRENT_SIZE; 305 uiooff = uio->uio_offset; 306 307 *ap->a_eofflag = 0; 308 fcmp = dp->i_mnt; 309 310 error = filecore_dbread(dp, &bp); 311 if (error) { 312 brelse(bp); 313 return error; 314 } 315 316 if (ap->a_ncookies == NULL) 317 cookies = NULL; 318 else { 319 *ap->a_ncookies = 0; 320 ncookies = uio->uio_resid/16; 321 cookies = malloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 322 } 323 324 for (; ; i++) { 325 switch (i) { 326 case 0: 327 /* Fake the '.' entry */ 328 de.d_fileno = dp->i_number; 329 de.d_type = DT_DIR; 330 de.d_namlen = 1; 331 strlcpy(de.d_name, ".", sizeof(de.d_name)); 332 break; 333 case 1: 334 /* Fake the '..' entry */ 335 de.d_fileno = filecore_getparent(dp); 336 de.d_type = DT_DIR; 337 de.d_namlen = 2; 338 strlcpy(de.d_name, "..", sizeof(de.d_name)); 339 break; 340 default: 341 de.d_fileno = dp->i_dirent.addr + 342 ((i - 2) << FILECORE_INO_INDEX); 343 dep = fcdirentry(bp->b_data, i - 2); 344 if (dep->attr & FILECORE_ATTR_DIR) 345 de.d_type = DT_DIR; 346 else 347 de.d_type = DT_REG; 348 if (filecore_fn2unix(dep->name, de.d_name, 349 /*###346 [cc] warning: passing arg 3 of `filecore_fn2unix' from incompatible pointer type%%%*/ 350 &de.d_namlen)) { 351 *ap->a_eofflag = 1; 352 goto out; 353 } 354 break; 355 } 356 de.d_reclen = _DIRENT_SIZE(&de); 357 if (uio->uio_resid < de.d_reclen) 358 goto out; 359 error = uiomove(&de, de.d_reclen, uio); 360 if (error) 361 goto out; 362 uiooff += FILECORE_DIRENT_SIZE; 363 364 if (cookies) { 365 *cookies++ = i*FILECORE_DIRENT_SIZE; 366 (*ap->a_ncookies)++; 367 if (--ncookies == 0) goto out; 368 } 369 } 370 out: 371 if (cookies) { 372 *ap->a_cookies = cookies; 373 if (error) { 374 free(cookies, M_TEMP); 375 *ap->a_ncookies = 0; 376 *ap->a_cookies = NULL; 377 } 378 } 379 uio->uio_offset = uiooff; 380 381 #ifdef FILECORE_DEBUG_BR 382 printf("brelse(%p) vn3\n", bp); 383 #endif 384 brelse (bp); 385 386 return (error); 387 } 388 389 /* 390 * Return target name of a symbolic link 391 * Shouldn't we get the parent vnode and read the data from there? 392 * This could eventually result in deadlocks in filecore_lookup. 393 * But otherwise the block read here is in the block buffer two times. 394 */ 395 int 396 filecore_readlink(v) 397 void *v; 398 { 399 #if 0 400 struct vop_readlink_args /* { 401 struct vnode *a_vp; 402 struct uio *a_uio; 403 kauth_cred_t a_cred; 404 } */ *ap = v; 405 #endif 406 407 return (EINVAL); 408 } 409 410 int 411 filecore_link(v) 412 void *v; 413 { 414 struct vop_link_args /* { 415 struct vnode *a_dvp; 416 struct vnode *a_vp; 417 struct componentname *a_cnp; 418 } */ *ap = v; 419 420 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 421 vput(ap->a_dvp); 422 return (EROFS); 423 } 424 425 int 426 filecore_symlink(v) 427 void *v; 428 { 429 struct vop_symlink_args /* { 430 struct vnode *a_dvp; 431 struct vnode **a_vpp; 432 struct componentname *a_cnp; 433 struct vattr *a_vap; 434 char *a_target; 435 } */ *ap = v; 436 437 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 438 vput(ap->a_dvp); 439 return (EROFS); 440 } 441 442 /* 443 * Calculate the logical to physical mapping if not done already, 444 * then call the device strategy routine. 445 */ 446 int 447 filecore_strategy(v) 448 void *v; 449 { 450 struct vop_strategy_args /* { 451 struct vnode *a_vp; 452 struct buf *a_bp; 453 } */ *ap = v; 454 struct buf *bp = ap->a_bp; 455 struct vnode *vp = ap->a_vp; 456 struct filecore_node *ip; 457 int error; 458 459 ip = VTOI(vp); 460 if (bp->b_blkno == bp->b_lblkno) { 461 error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL); 462 if (error) { 463 bp->b_error = error; 464 bp->b_flags |= B_ERROR; 465 biodone(bp); 466 return (error); 467 } 468 if ((long)bp->b_blkno == -1) 469 clrbuf(bp); 470 } 471 if ((long)bp->b_blkno == -1) { 472 biodone(bp); 473 return (0); 474 } 475 vp = ip->i_devvp; 476 return (VOP_STRATEGY(vp, bp)); 477 } 478 479 /* 480 * Print out the contents of an inode. 481 */ 482 /*ARGSUSED*/ 483 int 484 filecore_print(v) 485 void *v; 486 { 487 488 printf("tag VT_FILECORE, filecore vnode\n"); 489 return (0); 490 } 491 492 /* 493 * Return POSIX pathconf information applicable to filecore filesystems. 494 */ 495 int 496 filecore_pathconf(v) 497 void *v; 498 { 499 struct vop_pathconf_args /* { 500 struct vnode *a_vp; 501 int a_name; 502 register_t *a_retval; 503 } */ *ap = v; 504 switch (ap->a_name) { 505 case _PC_LINK_MAX: 506 *ap->a_retval = 1; 507 return (0); 508 case _PC_NAME_MAX: 509 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax; 510 return (0); 511 case _PC_PATH_MAX: 512 *ap->a_retval = 256; 513 return (0); 514 case _PC_CHOWN_RESTRICTED: 515 *ap->a_retval = 1; 516 return (0); 517 case _PC_NO_TRUNC: 518 *ap->a_retval = 1; 519 return (0); 520 case _PC_SYNC_IO: 521 *ap->a_retval = 1; 522 return (0); 523 case _PC_FILESIZEBITS: 524 *ap->a_retval = 32; 525 return (0); 526 default: 527 return (EINVAL); 528 } 529 /* NOTREACHED */ 530 } 531 532 /* 533 * Global vfs data structures for isofs 534 */ 535 #define filecore_create genfs_eopnotsupp 536 #define filecore_mknod genfs_eopnotsupp 537 #define filecore_write genfs_eopnotsupp 538 #define filecore_setattr genfs_eopnotsupp 539 #define filecore_lease_check genfs_lease_check 540 #define filecore_fcntl genfs_fcntl 541 #define filecore_ioctl genfs_enoioctl 542 #define filecore_fsync genfs_nullop 543 #define filecore_remove genfs_eopnotsupp 544 #define filecore_rename genfs_eopnotsupp 545 #define filecore_mkdir genfs_eopnotsupp 546 #define filecore_rmdir genfs_eopnotsupp 547 #define filecore_advlock genfs_eopnotsupp 548 #define filecore_bwrite genfs_eopnotsupp 549 #define filecore_revoke genfs_revoke 550 551 /* 552 * Global vfs data structures for filecore 553 */ 554 int (**filecore_vnodeop_p) __P((void *)); 555 const struct vnodeopv_entry_desc filecore_vnodeop_entries[] = { 556 { &vop_default_desc, vn_default_error }, 557 { &vop_lookup_desc, filecore_lookup }, /* lookup */ 558 { &vop_create_desc, filecore_create }, /* create */ 559 { &vop_mknod_desc, filecore_mknod }, /* mknod */ 560 { &vop_open_desc, filecore_open }, /* open */ 561 { &vop_close_desc, filecore_close }, /* close */ 562 { &vop_access_desc, filecore_access }, /* access */ 563 { &vop_getattr_desc, filecore_getattr }, /* getattr */ 564 { &vop_setattr_desc, filecore_setattr }, /* setattr */ 565 { &vop_read_desc, filecore_read }, /* read */ 566 { &vop_write_desc, filecore_write }, /* write */ 567 { &vop_lease_desc, filecore_lease_check }, /* lease */ 568 { &vop_fcntl_desc, filecore_fcntl }, /* fcntl */ 569 { &vop_ioctl_desc, filecore_ioctl }, /* ioctl */ 570 { &vop_poll_desc, filecore_poll }, /* poll */ 571 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 572 { &vop_revoke_desc, filecore_revoke }, /* revoke */ 573 { &vop_mmap_desc, filecore_mmap }, /* mmap */ 574 { &vop_fsync_desc, filecore_fsync }, /* fsync */ 575 { &vop_seek_desc, filecore_seek }, /* seek */ 576 { &vop_remove_desc, filecore_remove }, /* remove */ 577 { &vop_link_desc, filecore_link }, /* link */ 578 { &vop_rename_desc, filecore_rename }, /* rename */ 579 { &vop_mkdir_desc, filecore_mkdir }, /* mkdir */ 580 { &vop_rmdir_desc, filecore_rmdir }, /* rmdir */ 581 { &vop_symlink_desc, filecore_symlink }, /* symlink */ 582 { &vop_readdir_desc, filecore_readdir }, /* readdir */ 583 { &vop_readlink_desc, filecore_readlink }, /* readlink */ 584 { &vop_abortop_desc, filecore_abortop }, /* abortop */ 585 { &vop_inactive_desc, filecore_inactive }, /* inactive */ 586 { &vop_reclaim_desc, filecore_reclaim }, /* reclaim */ 587 { &vop_lock_desc, genfs_lock }, /* lock */ 588 { &vop_unlock_desc, genfs_unlock }, /* unlock */ 589 { &vop_bmap_desc, filecore_bmap }, /* bmap */ 590 { &vop_strategy_desc, filecore_strategy }, /* strategy */ 591 { &vop_print_desc, filecore_print }, /* print */ 592 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 593 { &vop_pathconf_desc, filecore_pathconf }, /* pathconf */ 594 { &vop_advlock_desc, filecore_advlock }, /* advlock */ 595 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 596 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 597 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 598 { NULL, NULL } 599 }; 600 const struct vnodeopv_desc filecore_vnodeop_opv_desc = 601 { &filecore_vnodeop_p, filecore_vnodeop_entries }; 602