1 /* $NetBSD: filecore_vnops.c,v 1.28 2008/11/26 20:17:33 pooka 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 1.28 2008/11/26 20:17:33 pooka 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 } */ *ap = v; 108 struct vnode *vp = ap->a_vp; 109 struct filecore_node *ip = VTOI(vp); 110 struct filecore_mnt *fcmp = ip->i_mnt; 111 112 /* 113 * Disallow write attempts unless the file is a socket, 114 * fifo, or a block or character device resident on the 115 * file system. 116 */ 117 if (ap->a_mode & VWRITE) { 118 switch (vp->v_type) { 119 case VDIR: 120 case VLNK: 121 case VREG: 122 return (EROFS); 123 default: 124 break; 125 } 126 } 127 128 return (vaccess(vp->v_type, filecore_mode(ip), 129 fcmp->fc_uid, fcmp->fc_gid, ap->a_mode, ap->a_cred)); 130 } 131 132 int 133 filecore_getattr(v) 134 void *v; 135 { 136 struct vop_getattr_args /* { 137 struct vnode *a_vp; 138 struct vattr *a_vap; 139 kauth_cred_t a_cred; 140 } */ *ap = v; 141 struct vnode *vp = ap->a_vp; 142 struct filecore_node *ip = VTOI(vp); 143 struct vattr *vap = ap->a_vap; 144 struct filecore_mnt *fcmp = ip->i_mnt; 145 146 vap->va_fsid = ip->i_dev; 147 vap->va_fileid = ip->i_number; 148 149 vap->va_mode = filecore_mode(ip); 150 vap->va_nlink = 1; 151 vap->va_uid = fcmp->fc_uid; 152 vap->va_gid = fcmp->fc_gid; 153 vap->va_atime = filecore_time(ip); 154 vap->va_mtime = filecore_time(ip); 155 vap->va_ctime = filecore_time(ip); 156 vap->va_rdev = 0; /* We don't support specials */ 157 158 vap->va_size = (u_quad_t) ip->i_size; 159 vap->va_flags = 0; 160 vap->va_gen = 1; 161 vap->va_blocksize = fcmp->blksize; 162 vap->va_bytes = vap->va_size; 163 vap->va_type = vp->v_type; 164 return (0); 165 } 166 167 /* 168 * Vnode op for reading. 169 */ 170 int 171 filecore_read(v) 172 void *v; 173 { 174 struct vop_read_args /* { 175 struct vnode *a_vp; 176 struct uio *a_uio; 177 int a_ioflag; 178 kauth_cred_t a_cred; 179 } */ *ap = v; 180 struct vnode *vp = ap->a_vp; 181 struct uio *uio = ap->a_uio; 182 struct filecore_node *ip = VTOI(vp); 183 struct filecore_mnt *fcmp; 184 struct buf *bp; 185 daddr_t lbn, rablock; 186 off_t diff; 187 int error = 0; 188 long size, n, on; 189 190 if (uio->uio_resid == 0) 191 return (0); 192 if (uio->uio_offset < 0) 193 return (EINVAL); 194 if (uio->uio_offset >= ip->i_size) 195 return (0); 196 ip->i_flag |= IN_ACCESS; 197 fcmp = ip->i_mnt; 198 199 if (vp->v_type == VREG) { 200 const int advice = IO_ADV_DECODE(ap->a_ioflag); 201 error = 0; 202 203 while (uio->uio_resid > 0) { 204 vsize_t bytelen = MIN(ip->i_size - uio->uio_offset, 205 uio->uio_resid); 206 207 if (bytelen == 0) { 208 break; 209 } 210 error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice, 211 UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp)); 212 if (error) { 213 break; 214 } 215 } 216 goto out; 217 } 218 219 do { 220 lbn = lblkno(fcmp, uio->uio_offset); 221 on = blkoff(fcmp, uio->uio_offset); 222 n = MIN(blksize(fcmp, ip, lbn) - on, uio->uio_resid); 223 diff = (off_t)ip->i_size - uio->uio_offset; 224 if (diff <= 0) 225 return (0); 226 if (diff < n) 227 n = diff; 228 size = blksize(fcmp, ip, lbn); 229 rablock = lbn + 1; 230 if (ip->i_dirent.attr & FILECORE_ATTR_DIR) { 231 error = filecore_dbread(ip, &bp); 232 on = uio->uio_offset; 233 n = MIN(FILECORE_DIR_SIZE - on, uio->uio_resid); 234 size = FILECORE_DIR_SIZE; 235 } else { 236 error = bread(vp, lbn, size, NOCRED, 0, &bp); 237 #ifdef FILECORE_DEBUG_BR 238 printf("bread(%p, %llx, %ld, CRED, %p)=%d\n", 239 vp, (long long)lbn, size, bp, error); 240 #endif 241 } 242 n = MIN(n, size - bp->b_resid); 243 if (error) { 244 #ifdef FILECORE_DEBUG_BR 245 printf("brelse(%p) vn1\n", bp); 246 #endif 247 brelse(bp, 0); 248 return (error); 249 } 250 251 error = uiomove((char *)(bp->b_data) + on, (int)n, uio); 252 #ifdef FILECORE_DEBUG_BR 253 printf("brelse(%p) vn2\n", bp); 254 #endif 255 brelse(bp, 0); 256 } while (error == 0 && uio->uio_resid > 0 && n != 0); 257 258 out: 259 return (error); 260 } 261 262 /* 263 * Vnode op for readdir 264 */ 265 int 266 filecore_readdir(v) 267 void *v; 268 { 269 struct vop_readdir_args /* { 270 struct vnode *a_vp; 271 struct uio *a_uio; 272 kauth_cred_t a_cred; 273 int *a_eofflag; 274 off_t **a_cookies; 275 int *a_ncookies; 276 } */ *ap = v; 277 struct uio *uio = ap->a_uio; 278 struct vnode *vdp = ap->a_vp; 279 struct filecore_node *dp; 280 struct filecore_mnt *fcmp; 281 struct buf *bp = NULL; 282 struct dirent *de; 283 struct filecore_direntry *dep = NULL; 284 int error = 0; 285 off_t *cookies = NULL; 286 int ncookies = 0; 287 int i; 288 off_t uiooff; 289 290 dp = VTOI(vdp); 291 292 if ((dp->i_dirent.attr & FILECORE_ATTR_DIR) == 0) 293 return (ENOTDIR); 294 295 if (uio->uio_offset % FILECORE_DIRENT_SIZE != 0) 296 return (EINVAL); 297 i = uio->uio_offset / FILECORE_DIRENT_SIZE; 298 uiooff = uio->uio_offset; 299 300 *ap->a_eofflag = 0; 301 fcmp = dp->i_mnt; 302 303 error = filecore_dbread(dp, &bp); 304 if (error) { 305 brelse(bp, 0); 306 return error; 307 } 308 309 if (ap->a_ncookies == NULL) 310 cookies = NULL; 311 else { 312 *ap->a_ncookies = 0; 313 ncookies = uio->uio_resid / _DIRENT_MINSIZE((struct dirent *)0); 314 cookies = malloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 315 } 316 317 de = malloc(sizeof(struct dirent), M_FILECORETMP, M_WAITOK | M_ZERO); 318 319 for (; ; i++) { 320 switch (i) { 321 case 0: 322 /* Fake the '.' entry */ 323 de->d_fileno = dp->i_number; 324 de->d_type = DT_DIR; 325 de->d_namlen = 1; 326 strlcpy(de->d_name, ".", sizeof(de->d_name)); 327 break; 328 case 1: 329 /* Fake the '..' entry */ 330 de->d_fileno = filecore_getparent(dp); 331 de->d_type = DT_DIR; 332 de->d_namlen = 2; 333 strlcpy(de->d_name, "..", sizeof(de->d_name)); 334 break; 335 default: 336 de->d_fileno = dp->i_dirent.addr + 337 ((i - 2) << FILECORE_INO_INDEX); 338 dep = fcdirentry(bp->b_data, i - 2); 339 if (dep->attr & FILECORE_ATTR_DIR) 340 de->d_type = DT_DIR; 341 else 342 de->d_type = DT_REG; 343 if (filecore_fn2unix(dep->name, de->d_name, 344 /*###346 [cc] warning: passing arg 3 of `filecore_fn2unix' from incompatible pointer type%%%*/ 345 &de->d_namlen)) { 346 *ap->a_eofflag = 1; 347 goto out; 348 } 349 break; 350 } 351 de->d_reclen = _DIRENT_SIZE(de); 352 if (uio->uio_resid < de->d_reclen) 353 goto out; 354 error = uiomove(de, de->d_reclen, uio); 355 if (error) 356 goto out; 357 uiooff += FILECORE_DIRENT_SIZE; 358 359 if (cookies) { 360 *cookies++ = i*FILECORE_DIRENT_SIZE; 361 (*ap->a_ncookies)++; 362 if (--ncookies == 0) goto out; 363 } 364 } 365 out: 366 if (cookies) { 367 *ap->a_cookies = cookies; 368 if (error) { 369 free(cookies, M_TEMP); 370 *ap->a_ncookies = 0; 371 *ap->a_cookies = NULL; 372 } 373 } 374 uio->uio_offset = uiooff; 375 376 #ifdef FILECORE_DEBUG_BR 377 printf("brelse(%p) vn3\n", bp); 378 #endif 379 brelse (bp, 0); 380 381 free(de, M_FILECORETMP); 382 383 return (error); 384 } 385 386 /* 387 * Return target name of a symbolic link 388 * Shouldn't we get the parent vnode and read the data from there? 389 * This could eventually result in deadlocks in filecore_lookup. 390 * But otherwise the block read here is in the block buffer two times. 391 */ 392 int 393 filecore_readlink(v) 394 void *v; 395 { 396 #if 0 397 struct vop_readlink_args /* { 398 struct vnode *a_vp; 399 struct uio *a_uio; 400 kauth_cred_t a_cred; 401 } */ *ap = v; 402 #endif 403 404 return (EINVAL); 405 } 406 407 int 408 filecore_link(v) 409 void *v; 410 { 411 struct vop_link_args /* { 412 struct vnode *a_dvp; 413 struct vnode *a_vp; 414 struct componentname *a_cnp; 415 } */ *ap = v; 416 417 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 418 vput(ap->a_dvp); 419 return (EROFS); 420 } 421 422 int 423 filecore_symlink(v) 424 void *v; 425 { 426 struct vop_symlink_args /* { 427 struct vnode *a_dvp; 428 struct vnode **a_vpp; 429 struct componentname *a_cnp; 430 struct vattr *a_vap; 431 char *a_target; 432 } */ *ap = v; 433 434 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 435 vput(ap->a_dvp); 436 return (EROFS); 437 } 438 439 /* 440 * Calculate the logical to physical mapping if not done already, 441 * then call the device strategy routine. 442 */ 443 int 444 filecore_strategy(v) 445 void *v; 446 { 447 struct vop_strategy_args /* { 448 struct vnode *a_vp; 449 struct buf *a_bp; 450 } */ *ap = v; 451 struct buf *bp = ap->a_bp; 452 struct vnode *vp = ap->a_vp; 453 struct filecore_node *ip; 454 int error; 455 456 ip = VTOI(vp); 457 if (bp->b_blkno == bp->b_lblkno) { 458 error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL); 459 if (error) { 460 bp->b_error = error; 461 biodone(bp); 462 return (error); 463 } 464 if ((long)bp->b_blkno == -1) 465 clrbuf(bp); 466 } 467 if ((long)bp->b_blkno == -1) { 468 biodone(bp); 469 return (0); 470 } 471 vp = ip->i_devvp; 472 return (VOP_STRATEGY(vp, bp)); 473 } 474 475 /* 476 * Print out the contents of an inode. 477 */ 478 /*ARGSUSED*/ 479 int 480 filecore_print(v) 481 void *v; 482 { 483 484 printf("tag VT_FILECORE, filecore vnode\n"); 485 return (0); 486 } 487 488 /* 489 * Return POSIX pathconf information applicable to filecore filesystems. 490 */ 491 int 492 filecore_pathconf(v) 493 void *v; 494 { 495 struct vop_pathconf_args /* { 496 struct vnode *a_vp; 497 int a_name; 498 register_t *a_retval; 499 } */ *ap = v; 500 switch (ap->a_name) { 501 case _PC_LINK_MAX: 502 *ap->a_retval = 1; 503 return (0); 504 case _PC_NAME_MAX: 505 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax; 506 return (0); 507 case _PC_PATH_MAX: 508 *ap->a_retval = 256; 509 return (0); 510 case _PC_CHOWN_RESTRICTED: 511 *ap->a_retval = 1; 512 return (0); 513 case _PC_NO_TRUNC: 514 *ap->a_retval = 1; 515 return (0); 516 case _PC_SYNC_IO: 517 *ap->a_retval = 1; 518 return (0); 519 case _PC_FILESIZEBITS: 520 *ap->a_retval = 32; 521 return (0); 522 default: 523 return (EINVAL); 524 } 525 /* NOTREACHED */ 526 } 527 528 /* 529 * Global vfs data structures for isofs 530 */ 531 #define filecore_create genfs_eopnotsupp 532 #define filecore_mknod genfs_eopnotsupp 533 #define filecore_write genfs_eopnotsupp 534 #define filecore_setattr genfs_eopnotsupp 535 #define filecore_fcntl genfs_fcntl 536 #define filecore_ioctl genfs_enoioctl 537 #define filecore_fsync genfs_nullop 538 #define filecore_remove genfs_eopnotsupp 539 #define filecore_rename genfs_eopnotsupp 540 #define filecore_mkdir genfs_eopnotsupp 541 #define filecore_rmdir genfs_eopnotsupp 542 #define filecore_advlock genfs_eopnotsupp 543 #define filecore_bwrite genfs_eopnotsupp 544 #define filecore_revoke genfs_revoke 545 546 /* 547 * Global vfs data structures for filecore 548 */ 549 int (**filecore_vnodeop_p) __P((void *)); 550 const struct vnodeopv_entry_desc filecore_vnodeop_entries[] = { 551 { &vop_default_desc, vn_default_error }, 552 { &vop_lookup_desc, filecore_lookup }, /* lookup */ 553 { &vop_create_desc, filecore_create }, /* create */ 554 { &vop_mknod_desc, filecore_mknod }, /* mknod */ 555 { &vop_open_desc, filecore_open }, /* open */ 556 { &vop_close_desc, filecore_close }, /* close */ 557 { &vop_access_desc, filecore_access }, /* access */ 558 { &vop_getattr_desc, filecore_getattr }, /* getattr */ 559 { &vop_setattr_desc, filecore_setattr }, /* setattr */ 560 { &vop_read_desc, filecore_read }, /* read */ 561 { &vop_write_desc, filecore_write }, /* write */ 562 { &vop_fcntl_desc, filecore_fcntl }, /* fcntl */ 563 { &vop_ioctl_desc, filecore_ioctl }, /* ioctl */ 564 { &vop_poll_desc, filecore_poll }, /* poll */ 565 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 566 { &vop_revoke_desc, filecore_revoke }, /* revoke */ 567 { &vop_mmap_desc, filecore_mmap }, /* mmap */ 568 { &vop_fsync_desc, filecore_fsync }, /* fsync */ 569 { &vop_seek_desc, filecore_seek }, /* seek */ 570 { &vop_remove_desc, filecore_remove }, /* remove */ 571 { &vop_link_desc, filecore_link }, /* link */ 572 { &vop_rename_desc, filecore_rename }, /* rename */ 573 { &vop_mkdir_desc, filecore_mkdir }, /* mkdir */ 574 { &vop_rmdir_desc, filecore_rmdir }, /* rmdir */ 575 { &vop_symlink_desc, filecore_symlink }, /* symlink */ 576 { &vop_readdir_desc, filecore_readdir }, /* readdir */ 577 { &vop_readlink_desc, filecore_readlink }, /* readlink */ 578 { &vop_abortop_desc, filecore_abortop }, /* abortop */ 579 { &vop_inactive_desc, filecore_inactive }, /* inactive */ 580 { &vop_reclaim_desc, filecore_reclaim }, /* reclaim */ 581 { &vop_lock_desc, genfs_lock }, /* lock */ 582 { &vop_unlock_desc, genfs_unlock }, /* unlock */ 583 { &vop_bmap_desc, filecore_bmap }, /* bmap */ 584 { &vop_strategy_desc, filecore_strategy }, /* strategy */ 585 { &vop_print_desc, filecore_print }, /* print */ 586 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 587 { &vop_pathconf_desc, filecore_pathconf }, /* pathconf */ 588 { &vop_advlock_desc, filecore_advlock }, /* advlock */ 589 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 590 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 591 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 592 { NULL, NULL } 593 }; 594 const struct vnodeopv_desc filecore_vnodeop_opv_desc = 595 { &filecore_vnodeop_p, filecore_vnodeop_entries }; 596