1 /* $NetBSD: filecore_vnops.c,v 1.24 2007/11/26 19:01:45 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 1.24 2007/11/26 19:01:45 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 void *win; 205 int flags; 206 vsize_t bytelen = MIN(ip->i_size - uio->uio_offset, 207 uio->uio_resid); 208 209 if (bytelen == 0) { 210 break; 211 } 212 win = ubc_alloc(&vp->v_uobj, uio->uio_offset, 213 &bytelen, advice, UBC_READ); 214 error = uiomove(win, bytelen, uio); 215 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 216 ubc_release(win, flags); 217 if (error) { 218 break; 219 } 220 } 221 goto out; 222 } 223 224 do { 225 lbn = lblkno(fcmp, uio->uio_offset); 226 on = blkoff(fcmp, uio->uio_offset); 227 n = MIN(blksize(fcmp, ip, lbn) - on, uio->uio_resid); 228 diff = (off_t)ip->i_size - uio->uio_offset; 229 if (diff <= 0) 230 return (0); 231 if (diff < n) 232 n = diff; 233 size = blksize(fcmp, ip, lbn); 234 rablock = lbn + 1; 235 if (ip->i_dirent.attr & FILECORE_ATTR_DIR) { 236 error = filecore_dbread(ip, &bp); 237 on = uio->uio_offset; 238 n = MIN(FILECORE_DIR_SIZE - on, uio->uio_resid); 239 size = FILECORE_DIR_SIZE; 240 } else { 241 error = bread(vp, lbn, size, NOCRED, &bp); 242 #ifdef FILECORE_DEBUG_BR 243 printf("bread(%p, %x, %ld, CRED, %p)=%d\n", 244 vp, lbn, size, bp, error); 245 #endif 246 } 247 n = MIN(n, size - bp->b_resid); 248 if (error) { 249 #ifdef FILECORE_DEBUG_BR 250 printf("brelse(%p) vn1\n", bp); 251 #endif 252 brelse(bp, 0); 253 return (error); 254 } 255 256 error = uiomove((char *)(bp->b_data) + on, (int)n, uio); 257 #ifdef FILECORE_DEBUG_BR 258 printf("brelse(%p) vn2\n", bp); 259 #endif 260 brelse(bp, 0); 261 } while (error == 0 && uio->uio_resid > 0 && n != 0); 262 263 out: 264 return (error); 265 } 266 267 /* 268 * Vnode op for readdir 269 */ 270 int 271 filecore_readdir(v) 272 void *v; 273 { 274 struct vop_readdir_args /* { 275 struct vnode *a_vp; 276 struct uio *a_uio; 277 kauth_cred_t a_cred; 278 int *a_eofflag; 279 off_t **a_cookies; 280 int *a_ncookies; 281 } */ *ap = v; 282 struct uio *uio = ap->a_uio; 283 struct vnode *vdp = ap->a_vp; 284 struct filecore_node *dp; 285 struct filecore_mnt *fcmp; 286 struct buf *bp = NULL; 287 struct dirent *de; 288 struct filecore_direntry *dep = NULL; 289 int error = 0; 290 off_t *cookies = NULL; 291 int ncookies = 0; 292 int i; 293 off_t uiooff; 294 295 dp = VTOI(vdp); 296 297 if ((dp->i_dirent.attr & FILECORE_ATTR_DIR) == 0) 298 return (ENOTDIR); 299 300 if (uio->uio_offset % FILECORE_DIRENT_SIZE != 0) 301 return (EINVAL); 302 i = uio->uio_offset / FILECORE_DIRENT_SIZE; 303 uiooff = uio->uio_offset; 304 305 *ap->a_eofflag = 0; 306 fcmp = dp->i_mnt; 307 308 error = filecore_dbread(dp, &bp); 309 if (error) { 310 brelse(bp, 0); 311 return error; 312 } 313 314 if (ap->a_ncookies == NULL) 315 cookies = NULL; 316 else { 317 *ap->a_ncookies = 0; 318 ncookies = uio->uio_resid / _DIRENT_MINSIZE((struct dirent *)0); 319 cookies = malloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 320 } 321 322 de = malloc(sizeof(struct dirent), M_FILECORETMP, M_WAITOK | M_ZERO); 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, 0); 385 386 free(de, M_FILECORETMP); 387 388 return (error); 389 } 390 391 /* 392 * Return target name of a symbolic link 393 * Shouldn't we get the parent vnode and read the data from there? 394 * This could eventually result in deadlocks in filecore_lookup. 395 * But otherwise the block read here is in the block buffer two times. 396 */ 397 int 398 filecore_readlink(v) 399 void *v; 400 { 401 #if 0 402 struct vop_readlink_args /* { 403 struct vnode *a_vp; 404 struct uio *a_uio; 405 kauth_cred_t a_cred; 406 } */ *ap = v; 407 #endif 408 409 return (EINVAL); 410 } 411 412 int 413 filecore_link(v) 414 void *v; 415 { 416 struct vop_link_args /* { 417 struct vnode *a_dvp; 418 struct vnode *a_vp; 419 struct componentname *a_cnp; 420 } */ *ap = v; 421 422 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 423 vput(ap->a_dvp); 424 return (EROFS); 425 } 426 427 int 428 filecore_symlink(v) 429 void *v; 430 { 431 struct vop_symlink_args /* { 432 struct vnode *a_dvp; 433 struct vnode **a_vpp; 434 struct componentname *a_cnp; 435 struct vattr *a_vap; 436 char *a_target; 437 } */ *ap = v; 438 439 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 440 vput(ap->a_dvp); 441 return (EROFS); 442 } 443 444 /* 445 * Calculate the logical to physical mapping if not done already, 446 * then call the device strategy routine. 447 */ 448 int 449 filecore_strategy(v) 450 void *v; 451 { 452 struct vop_strategy_args /* { 453 struct vnode *a_vp; 454 struct buf *a_bp; 455 } */ *ap = v; 456 struct buf *bp = ap->a_bp; 457 struct vnode *vp = ap->a_vp; 458 struct filecore_node *ip; 459 int error; 460 461 ip = VTOI(vp); 462 if (bp->b_blkno == bp->b_lblkno) { 463 error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL); 464 if (error) { 465 bp->b_error = error; 466 biodone(bp); 467 return (error); 468 } 469 if ((long)bp->b_blkno == -1) 470 clrbuf(bp); 471 } 472 if ((long)bp->b_blkno == -1) { 473 biodone(bp); 474 return (0); 475 } 476 vp = ip->i_devvp; 477 return (VOP_STRATEGY(vp, bp)); 478 } 479 480 /* 481 * Print out the contents of an inode. 482 */ 483 /*ARGSUSED*/ 484 int 485 filecore_print(v) 486 void *v; 487 { 488 489 printf("tag VT_FILECORE, filecore vnode\n"); 490 return (0); 491 } 492 493 /* 494 * Return POSIX pathconf information applicable to filecore filesystems. 495 */ 496 int 497 filecore_pathconf(v) 498 void *v; 499 { 500 struct vop_pathconf_args /* { 501 struct vnode *a_vp; 502 int a_name; 503 register_t *a_retval; 504 } */ *ap = v; 505 switch (ap->a_name) { 506 case _PC_LINK_MAX: 507 *ap->a_retval = 1; 508 return (0); 509 case _PC_NAME_MAX: 510 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax; 511 return (0); 512 case _PC_PATH_MAX: 513 *ap->a_retval = 256; 514 return (0); 515 case _PC_CHOWN_RESTRICTED: 516 *ap->a_retval = 1; 517 return (0); 518 case _PC_NO_TRUNC: 519 *ap->a_retval = 1; 520 return (0); 521 case _PC_SYNC_IO: 522 *ap->a_retval = 1; 523 return (0); 524 case _PC_FILESIZEBITS: 525 *ap->a_retval = 32; 526 return (0); 527 default: 528 return (EINVAL); 529 } 530 /* NOTREACHED */ 531 } 532 533 /* 534 * Global vfs data structures for isofs 535 */ 536 #define filecore_create genfs_eopnotsupp 537 #define filecore_mknod genfs_eopnotsupp 538 #define filecore_write genfs_eopnotsupp 539 #define filecore_setattr genfs_eopnotsupp 540 #define filecore_lease_check genfs_lease_check 541 #define filecore_fcntl genfs_fcntl 542 #define filecore_ioctl genfs_enoioctl 543 #define filecore_fsync genfs_nullop 544 #define filecore_remove genfs_eopnotsupp 545 #define filecore_rename genfs_eopnotsupp 546 #define filecore_mkdir genfs_eopnotsupp 547 #define filecore_rmdir genfs_eopnotsupp 548 #define filecore_advlock genfs_eopnotsupp 549 #define filecore_bwrite genfs_eopnotsupp 550 #define filecore_revoke genfs_revoke 551 552 /* 553 * Global vfs data structures for filecore 554 */ 555 int (**filecore_vnodeop_p) __P((void *)); 556 const struct vnodeopv_entry_desc filecore_vnodeop_entries[] = { 557 { &vop_default_desc, vn_default_error }, 558 { &vop_lookup_desc, filecore_lookup }, /* lookup */ 559 { &vop_create_desc, filecore_create }, /* create */ 560 { &vop_mknod_desc, filecore_mknod }, /* mknod */ 561 { &vop_open_desc, filecore_open }, /* open */ 562 { &vop_close_desc, filecore_close }, /* close */ 563 { &vop_access_desc, filecore_access }, /* access */ 564 { &vop_getattr_desc, filecore_getattr }, /* getattr */ 565 { &vop_setattr_desc, filecore_setattr }, /* setattr */ 566 { &vop_read_desc, filecore_read }, /* read */ 567 { &vop_write_desc, filecore_write }, /* write */ 568 { &vop_lease_desc, filecore_lease_check }, /* lease */ 569 { &vop_fcntl_desc, filecore_fcntl }, /* fcntl */ 570 { &vop_ioctl_desc, filecore_ioctl }, /* ioctl */ 571 { &vop_poll_desc, filecore_poll }, /* poll */ 572 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 573 { &vop_revoke_desc, filecore_revoke }, /* revoke */ 574 { &vop_mmap_desc, filecore_mmap }, /* mmap */ 575 { &vop_fsync_desc, filecore_fsync }, /* fsync */ 576 { &vop_seek_desc, filecore_seek }, /* seek */ 577 { &vop_remove_desc, filecore_remove }, /* remove */ 578 { &vop_link_desc, filecore_link }, /* link */ 579 { &vop_rename_desc, filecore_rename }, /* rename */ 580 { &vop_mkdir_desc, filecore_mkdir }, /* mkdir */ 581 { &vop_rmdir_desc, filecore_rmdir }, /* rmdir */ 582 { &vop_symlink_desc, filecore_symlink }, /* symlink */ 583 { &vop_readdir_desc, filecore_readdir }, /* readdir */ 584 { &vop_readlink_desc, filecore_readlink }, /* readlink */ 585 { &vop_abortop_desc, filecore_abortop }, /* abortop */ 586 { &vop_inactive_desc, filecore_inactive }, /* inactive */ 587 { &vop_reclaim_desc, filecore_reclaim }, /* reclaim */ 588 { &vop_lock_desc, genfs_lock }, /* lock */ 589 { &vop_unlock_desc, genfs_unlock }, /* unlock */ 590 { &vop_bmap_desc, filecore_bmap }, /* bmap */ 591 { &vop_strategy_desc, filecore_strategy }, /* strategy */ 592 { &vop_print_desc, filecore_print }, /* print */ 593 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 594 { &vop_pathconf_desc, filecore_pathconf }, /* pathconf */ 595 { &vop_advlock_desc, filecore_advlock }, /* advlock */ 596 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 597 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 598 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 599 { NULL, NULL } 600 }; 601 const struct vnodeopv_desc filecore_vnodeop_opv_desc = 602 { &filecore_vnodeop_p, filecore_vnodeop_entries }; 603