1 /* $NetBSD: filecore_vnops.c,v 1.30 2009/03/14 21:04:23 dsl 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 1.30 2009/03/14 21:04:23 dsl 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(void *v) 101 { 102 struct vop_access_args /* { 103 struct vnode *a_vp; 104 int a_mode; 105 kauth_cred_t a_cred; 106 } */ *ap = v; 107 struct vnode *vp = ap->a_vp; 108 struct filecore_node *ip = VTOI(vp); 109 struct filecore_mnt *fcmp = ip->i_mnt; 110 111 /* 112 * Disallow write attempts unless the file is a socket, 113 * fifo, or a block or character device resident on the 114 * file system. 115 */ 116 if (ap->a_mode & VWRITE) { 117 switch (vp->v_type) { 118 case VDIR: 119 case VLNK: 120 case VREG: 121 return (EROFS); 122 default: 123 break; 124 } 125 } 126 127 return (vaccess(vp->v_type, filecore_mode(ip), 128 fcmp->fc_uid, fcmp->fc_gid, ap->a_mode, ap->a_cred)); 129 } 130 131 int 132 filecore_getattr(void *v) 133 { 134 struct vop_getattr_args /* { 135 struct vnode *a_vp; 136 struct vattr *a_vap; 137 kauth_cred_t a_cred; 138 } */ *ap = v; 139 struct vnode *vp = ap->a_vp; 140 struct filecore_node *ip = VTOI(vp); 141 struct vattr *vap = ap->a_vap; 142 struct filecore_mnt *fcmp = ip->i_mnt; 143 144 vap->va_fsid = ip->i_dev; 145 vap->va_fileid = ip->i_number; 146 147 vap->va_mode = filecore_mode(ip); 148 vap->va_nlink = 1; 149 vap->va_uid = fcmp->fc_uid; 150 vap->va_gid = fcmp->fc_gid; 151 vap->va_atime = filecore_time(ip); 152 vap->va_mtime = filecore_time(ip); 153 vap->va_ctime = filecore_time(ip); 154 vap->va_rdev = 0; /* We don't support specials */ 155 156 vap->va_size = (u_quad_t) ip->i_size; 157 vap->va_flags = 0; 158 vap->va_gen = 1; 159 vap->va_blocksize = fcmp->blksize; 160 vap->va_bytes = vap->va_size; 161 vap->va_type = vp->v_type; 162 return (0); 163 } 164 165 /* 166 * Vnode op for reading. 167 */ 168 int 169 filecore_read(void *v) 170 { 171 struct vop_read_args /* { 172 struct vnode *a_vp; 173 struct uio *a_uio; 174 int a_ioflag; 175 kauth_cred_t a_cred; 176 } */ *ap = v; 177 struct vnode *vp = ap->a_vp; 178 struct uio *uio = ap->a_uio; 179 struct filecore_node *ip = VTOI(vp); 180 struct filecore_mnt *fcmp; 181 struct buf *bp; 182 daddr_t lbn, rablock; 183 off_t diff; 184 int error = 0; 185 long size, n, on; 186 187 if (uio->uio_resid == 0) 188 return (0); 189 if (uio->uio_offset < 0) 190 return (EINVAL); 191 if (uio->uio_offset >= ip->i_size) 192 return (0); 193 ip->i_flag |= IN_ACCESS; 194 fcmp = ip->i_mnt; 195 196 if (vp->v_type == VREG) { 197 const int advice = IO_ADV_DECODE(ap->a_ioflag); 198 error = 0; 199 200 while (uio->uio_resid > 0) { 201 vsize_t bytelen = MIN(ip->i_size - uio->uio_offset, 202 uio->uio_resid); 203 204 if (bytelen == 0) { 205 break; 206 } 207 error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice, 208 UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp)); 209 if (error) { 210 break; 211 } 212 } 213 goto out; 214 } 215 216 do { 217 lbn = lblkno(fcmp, uio->uio_offset); 218 on = blkoff(fcmp, uio->uio_offset); 219 n = MIN(blksize(fcmp, ip, lbn) - on, uio->uio_resid); 220 diff = (off_t)ip->i_size - uio->uio_offset; 221 if (diff <= 0) 222 return (0); 223 if (diff < n) 224 n = diff; 225 size = blksize(fcmp, ip, lbn); 226 rablock = lbn + 1; 227 if (ip->i_dirent.attr & FILECORE_ATTR_DIR) { 228 error = filecore_dbread(ip, &bp); 229 on = uio->uio_offset; 230 n = MIN(FILECORE_DIR_SIZE - on, uio->uio_resid); 231 size = FILECORE_DIR_SIZE; 232 } else { 233 error = bread(vp, lbn, size, NOCRED, 0, &bp); 234 #ifdef FILECORE_DEBUG_BR 235 printf("bread(%p, %llx, %ld, CRED, %p)=%d\n", 236 vp, (long long)lbn, size, bp, error); 237 #endif 238 } 239 n = MIN(n, size - bp->b_resid); 240 if (error) { 241 #ifdef FILECORE_DEBUG_BR 242 printf("brelse(%p) vn1\n", bp); 243 #endif 244 brelse(bp, 0); 245 return (error); 246 } 247 248 error = uiomove((char *)(bp->b_data) + on, (int)n, uio); 249 #ifdef FILECORE_DEBUG_BR 250 printf("brelse(%p) vn2\n", bp); 251 #endif 252 brelse(bp, 0); 253 } while (error == 0 && uio->uio_resid > 0 && n != 0); 254 255 out: 256 return (error); 257 } 258 259 /* 260 * Vnode op for readdir 261 */ 262 int 263 filecore_readdir(void *v) 264 { 265 struct vop_readdir_args /* { 266 struct vnode *a_vp; 267 struct uio *a_uio; 268 kauth_cred_t a_cred; 269 int *a_eofflag; 270 off_t **a_cookies; 271 int *a_ncookies; 272 } */ *ap = v; 273 struct uio *uio = ap->a_uio; 274 struct vnode *vdp = ap->a_vp; 275 struct filecore_node *dp; 276 struct filecore_mnt *fcmp; 277 struct buf *bp = NULL; 278 struct dirent *de; 279 struct filecore_direntry *dep = NULL; 280 int error = 0; 281 off_t *cookies = NULL; 282 int ncookies = 0; 283 int i; 284 off_t uiooff; 285 286 dp = VTOI(vdp); 287 288 if ((dp->i_dirent.attr & FILECORE_ATTR_DIR) == 0) 289 return (ENOTDIR); 290 291 if (uio->uio_offset % FILECORE_DIRENT_SIZE != 0) 292 return (EINVAL); 293 i = uio->uio_offset / FILECORE_DIRENT_SIZE; 294 uiooff = uio->uio_offset; 295 296 *ap->a_eofflag = 0; 297 fcmp = dp->i_mnt; 298 299 error = filecore_dbread(dp, &bp); 300 if (error) { 301 brelse(bp, 0); 302 return error; 303 } 304 305 if (ap->a_ncookies == NULL) 306 cookies = NULL; 307 else { 308 *ap->a_ncookies = 0; 309 ncookies = uio->uio_resid / _DIRENT_MINSIZE((struct dirent *)0); 310 cookies = malloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 311 } 312 313 de = malloc(sizeof(struct dirent), M_FILECORETMP, M_WAITOK | M_ZERO); 314 315 for (; ; i++) { 316 switch (i) { 317 case 0: 318 /* Fake the '.' entry */ 319 de->d_fileno = dp->i_number; 320 de->d_type = DT_DIR; 321 de->d_namlen = 1; 322 strlcpy(de->d_name, ".", sizeof(de->d_name)); 323 break; 324 case 1: 325 /* Fake the '..' entry */ 326 de->d_fileno = filecore_getparent(dp); 327 de->d_type = DT_DIR; 328 de->d_namlen = 2; 329 strlcpy(de->d_name, "..", sizeof(de->d_name)); 330 break; 331 default: 332 de->d_fileno = dp->i_dirent.addr + 333 ((i - 2) << FILECORE_INO_INDEX); 334 dep = fcdirentry(bp->b_data, i - 2); 335 if (dep->attr & FILECORE_ATTR_DIR) 336 de->d_type = DT_DIR; 337 else 338 de->d_type = DT_REG; 339 if (filecore_fn2unix(dep->name, de->d_name, 340 /*###346 [cc] warning: passing arg 3 of `filecore_fn2unix' from incompatible pointer type%%%*/ 341 &de->d_namlen)) { 342 *ap->a_eofflag = 1; 343 goto out; 344 } 345 break; 346 } 347 de->d_reclen = _DIRENT_SIZE(de); 348 if (uio->uio_resid < de->d_reclen) 349 goto out; 350 error = uiomove(de, de->d_reclen, uio); 351 if (error) 352 goto out; 353 uiooff += FILECORE_DIRENT_SIZE; 354 355 if (cookies) { 356 *cookies++ = i*FILECORE_DIRENT_SIZE; 357 (*ap->a_ncookies)++; 358 if (--ncookies == 0) goto out; 359 } 360 } 361 out: 362 if (cookies) { 363 *ap->a_cookies = cookies; 364 if (error) { 365 free(cookies, M_TEMP); 366 *ap->a_ncookies = 0; 367 *ap->a_cookies = NULL; 368 } 369 } 370 uio->uio_offset = uiooff; 371 372 #ifdef FILECORE_DEBUG_BR 373 printf("brelse(%p) vn3\n", bp); 374 #endif 375 brelse (bp, 0); 376 377 free(de, M_FILECORETMP); 378 379 return (error); 380 } 381 382 /* 383 * Return target name of a symbolic link 384 * Shouldn't we get the parent vnode and read the data from there? 385 * This could eventually result in deadlocks in filecore_lookup. 386 * But otherwise the block read here is in the block buffer two times. 387 */ 388 int 389 filecore_readlink(void *v) 390 { 391 #if 0 392 struct vop_readlink_args /* { 393 struct vnode *a_vp; 394 struct uio *a_uio; 395 kauth_cred_t a_cred; 396 } */ *ap = v; 397 #endif 398 399 return (EINVAL); 400 } 401 402 int 403 filecore_link(void *v) 404 { 405 struct vop_link_args /* { 406 struct vnode *a_dvp; 407 struct vnode *a_vp; 408 struct componentname *a_cnp; 409 } */ *ap = v; 410 411 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 412 vput(ap->a_dvp); 413 return (EROFS); 414 } 415 416 int 417 filecore_symlink(void *v) 418 { 419 struct vop_symlink_args /* { 420 struct vnode *a_dvp; 421 struct vnode **a_vpp; 422 struct componentname *a_cnp; 423 struct vattr *a_vap; 424 char *a_target; 425 } */ *ap = v; 426 427 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 428 vput(ap->a_dvp); 429 return (EROFS); 430 } 431 432 /* 433 * Calculate the logical to physical mapping if not done already, 434 * then call the device strategy routine. 435 */ 436 int 437 filecore_strategy(void *v) 438 { 439 struct vop_strategy_args /* { 440 struct vnode *a_vp; 441 struct buf *a_bp; 442 } */ *ap = v; 443 struct buf *bp = ap->a_bp; 444 struct vnode *vp = ap->a_vp; 445 struct filecore_node *ip; 446 int error; 447 448 ip = VTOI(vp); 449 if (bp->b_blkno == bp->b_lblkno) { 450 error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL); 451 if (error) { 452 bp->b_error = error; 453 biodone(bp); 454 return (error); 455 } 456 if ((long)bp->b_blkno == -1) 457 clrbuf(bp); 458 } 459 if ((long)bp->b_blkno == -1) { 460 biodone(bp); 461 return (0); 462 } 463 vp = ip->i_devvp; 464 return (VOP_STRATEGY(vp, bp)); 465 } 466 467 /* 468 * Print out the contents of an inode. 469 */ 470 /*ARGSUSED*/ 471 int 472 filecore_print(void *v) 473 { 474 475 printf("tag VT_FILECORE, filecore vnode\n"); 476 return (0); 477 } 478 479 /* 480 * Return POSIX pathconf information applicable to filecore filesystems. 481 */ 482 int 483 filecore_pathconf(void *v) 484 { 485 struct vop_pathconf_args /* { 486 struct vnode *a_vp; 487 int a_name; 488 register_t *a_retval; 489 } */ *ap = v; 490 switch (ap->a_name) { 491 case _PC_LINK_MAX: 492 *ap->a_retval = 1; 493 return (0); 494 case _PC_NAME_MAX: 495 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax; 496 return (0); 497 case _PC_PATH_MAX: 498 *ap->a_retval = 256; 499 return (0); 500 case _PC_CHOWN_RESTRICTED: 501 *ap->a_retval = 1; 502 return (0); 503 case _PC_NO_TRUNC: 504 *ap->a_retval = 1; 505 return (0); 506 case _PC_SYNC_IO: 507 *ap->a_retval = 1; 508 return (0); 509 case _PC_FILESIZEBITS: 510 *ap->a_retval = 32; 511 return (0); 512 default: 513 return (EINVAL); 514 } 515 /* NOTREACHED */ 516 } 517 518 /* 519 * Global vfs data structures for isofs 520 */ 521 #define filecore_create genfs_eopnotsupp 522 #define filecore_mknod genfs_eopnotsupp 523 #define filecore_write genfs_eopnotsupp 524 #define filecore_setattr genfs_eopnotsupp 525 #define filecore_fcntl genfs_fcntl 526 #define filecore_ioctl genfs_enoioctl 527 #define filecore_fsync genfs_nullop 528 #define filecore_remove genfs_eopnotsupp 529 #define filecore_rename genfs_eopnotsupp 530 #define filecore_mkdir genfs_eopnotsupp 531 #define filecore_rmdir genfs_eopnotsupp 532 #define filecore_advlock genfs_eopnotsupp 533 #define filecore_bwrite genfs_eopnotsupp 534 #define filecore_revoke genfs_revoke 535 536 /* 537 * Global vfs data structures for filecore 538 */ 539 int (**filecore_vnodeop_p)(void *); 540 const struct vnodeopv_entry_desc filecore_vnodeop_entries[] = { 541 { &vop_default_desc, vn_default_error }, 542 { &vop_lookup_desc, filecore_lookup }, /* lookup */ 543 { &vop_create_desc, filecore_create }, /* create */ 544 { &vop_mknod_desc, filecore_mknod }, /* mknod */ 545 { &vop_open_desc, filecore_open }, /* open */ 546 { &vop_close_desc, filecore_close }, /* close */ 547 { &vop_access_desc, filecore_access }, /* access */ 548 { &vop_getattr_desc, filecore_getattr }, /* getattr */ 549 { &vop_setattr_desc, filecore_setattr }, /* setattr */ 550 { &vop_read_desc, filecore_read }, /* read */ 551 { &vop_write_desc, filecore_write }, /* write */ 552 { &vop_fcntl_desc, filecore_fcntl }, /* fcntl */ 553 { &vop_ioctl_desc, filecore_ioctl }, /* ioctl */ 554 { &vop_poll_desc, filecore_poll }, /* poll */ 555 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 556 { &vop_revoke_desc, filecore_revoke }, /* revoke */ 557 { &vop_mmap_desc, filecore_mmap }, /* mmap */ 558 { &vop_fsync_desc, filecore_fsync }, /* fsync */ 559 { &vop_seek_desc, filecore_seek }, /* seek */ 560 { &vop_remove_desc, filecore_remove }, /* remove */ 561 { &vop_link_desc, filecore_link }, /* link */ 562 { &vop_rename_desc, filecore_rename }, /* rename */ 563 { &vop_mkdir_desc, filecore_mkdir }, /* mkdir */ 564 { &vop_rmdir_desc, filecore_rmdir }, /* rmdir */ 565 { &vop_symlink_desc, filecore_symlink }, /* symlink */ 566 { &vop_readdir_desc, filecore_readdir }, /* readdir */ 567 { &vop_readlink_desc, filecore_readlink }, /* readlink */ 568 { &vop_abortop_desc, filecore_abortop }, /* abortop */ 569 { &vop_inactive_desc, filecore_inactive }, /* inactive */ 570 { &vop_reclaim_desc, filecore_reclaim }, /* reclaim */ 571 { &vop_lock_desc, genfs_lock }, /* lock */ 572 { &vop_unlock_desc, genfs_unlock }, /* unlock */ 573 { &vop_bmap_desc, filecore_bmap }, /* bmap */ 574 { &vop_strategy_desc, filecore_strategy }, /* strategy */ 575 { &vop_print_desc, filecore_print }, /* print */ 576 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 577 { &vop_pathconf_desc, filecore_pathconf }, /* pathconf */ 578 { &vop_advlock_desc, filecore_advlock }, /* advlock */ 579 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 580 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 581 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 582 { NULL, NULL } 583 }; 584 const struct vnodeopv_desc filecore_vnodeop_opv_desc = 585 { &filecore_vnodeop_p, filecore_vnodeop_entries }; 586