1 /* $NetBSD: filecore_vnops.c,v 1.50 2022/03/27 17:10:55 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 1.50 2022/03/27 17:10:55 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 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 accmode_t accmode, kauth_cred_t cred) 126 { 127 struct filecore_mnt *fcmp = ip->i_mnt; 128 129 return kauth_authorize_vnode(cred, KAUTH_ACCESS_ACTION(accmode, 130 vp->v_type, filecore_mode(ip)), vp, NULL, 131 genfs_can_access(vp, cred, fcmp->fc_uid, fcmp->fc_gid, 132 filecore_mode(ip), NULL, accmode)); 133 } 134 135 int 136 filecore_access(void *v) 137 { 138 struct vop_access_args /* { 139 struct vnode *a_vp; 140 accmode_t a_accmode; 141 kauth_cred_t a_cred; 142 } */ *ap = v; 143 struct vnode *vp = ap->a_vp; 144 struct filecore_node *ip = VTOI(vp); 145 int error; 146 147 error = filecore_check_possible(vp, ip, ap->a_accmode); 148 if (error) 149 return error; 150 151 error = filecore_check_permitted(vp, ip, ap->a_accmode, ap->a_cred); 152 153 return error; 154 } 155 156 int 157 filecore_getattr(void *v) 158 { 159 struct vop_getattr_args /* { 160 struct vnode *a_vp; 161 struct vattr *a_vap; 162 kauth_cred_t a_cred; 163 } */ *ap = v; 164 struct vnode *vp = ap->a_vp; 165 struct filecore_node *ip = VTOI(vp); 166 struct vattr *vap = ap->a_vap; 167 struct filecore_mnt *fcmp = ip->i_mnt; 168 169 vap->va_fsid = ip->i_dev; 170 vap->va_fileid = ip->i_number; 171 172 vap->va_mode = filecore_mode(ip); 173 vap->va_nlink = 1; 174 vap->va_uid = fcmp->fc_uid; 175 vap->va_gid = fcmp->fc_gid; 176 vap->va_atime = filecore_time(ip); 177 vap->va_mtime = filecore_time(ip); 178 vap->va_ctime = filecore_time(ip); 179 vap->va_rdev = 0; /* We don't support specials */ 180 181 vap->va_size = (u_quad_t) ip->i_size; 182 vap->va_flags = 0; 183 vap->va_gen = 1; 184 vap->va_blocksize = fcmp->blksize; 185 vap->va_bytes = vap->va_size; 186 vap->va_type = vp->v_type; 187 return (0); 188 } 189 190 /* 191 * Vnode op for reading. 192 */ 193 int 194 filecore_read(void *v) 195 { 196 struct vop_read_args /* { 197 struct vnode *a_vp; 198 struct uio *a_uio; 199 int a_ioflag; 200 kauth_cred_t a_cred; 201 } */ *ap = v; 202 struct vnode *vp = ap->a_vp; 203 struct uio *uio = ap->a_uio; 204 struct filecore_node *ip = VTOI(vp); 205 struct filecore_mnt *fcmp; 206 struct buf *bp; 207 daddr_t lbn; 208 off_t diff; 209 int error = 0; 210 long size, n, on; 211 212 if (uio->uio_resid == 0) 213 return (0); 214 if (uio->uio_offset < 0) 215 return (EINVAL); 216 if (uio->uio_offset >= ip->i_size) 217 return (0); 218 ip->i_flag |= IN_ACCESS; 219 fcmp = ip->i_mnt; 220 221 if (vp->v_type == VREG) { 222 const int advice = IO_ADV_DECODE(ap->a_ioflag); 223 error = 0; 224 225 while (uio->uio_resid > 0) { 226 vsize_t bytelen = MIN(ip->i_size - uio->uio_offset, 227 uio->uio_resid); 228 229 if (bytelen == 0) { 230 break; 231 } 232 error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice, 233 UBC_READ | UBC_PARTIALOK | UBC_VNODE_FLAGS(vp)); 234 if (error) { 235 break; 236 } 237 } 238 goto out; 239 } 240 241 do { 242 lbn = filecore_lblkno(fcmp, uio->uio_offset); 243 on = filecore_blkoff(fcmp, uio->uio_offset); 244 n = MIN(filecore_blksize(fcmp, ip, lbn) - on, uio->uio_resid); 245 diff = (off_t)ip->i_size - uio->uio_offset; 246 if (diff <= 0) 247 return (0); 248 if (diff < n) 249 n = diff; 250 size = filecore_blksize(fcmp, ip, lbn); 251 if (ip->i_dirent.attr & FILECORE_ATTR_DIR) { 252 error = filecore_dbread(ip, &bp); 253 on = uio->uio_offset; 254 n = MIN(FILECORE_DIR_SIZE - on, uio->uio_resid); 255 size = FILECORE_DIR_SIZE; 256 } else { 257 error = bread(vp, lbn, size, 0, &bp); 258 #ifdef FILECORE_DEBUG_BR 259 printf("bread(%p, %llx, %ld, CRED, %p)=%d\n", 260 vp, (long long)lbn, size, bp, error); 261 #endif 262 } 263 if (error) { 264 return (error); 265 } 266 n = MIN(n, size - bp->b_resid); 267 268 error = uiomove((char *)(bp->b_data) + on, (int)n, uio); 269 #ifdef FILECORE_DEBUG_BR 270 printf("brelse(%p) vn2\n", bp); 271 #endif 272 brelse(bp, 0); 273 } while (error == 0 && uio->uio_resid > 0 && n != 0); 274 275 out: 276 return (error); 277 } 278 279 /* 280 * Vnode op for readdir 281 */ 282 int 283 filecore_readdir(void *v) 284 { 285 struct vop_readdir_args /* { 286 struct vnode *a_vp; 287 struct uio *a_uio; 288 kauth_cred_t a_cred; 289 int *a_eofflag; 290 off_t **a_cookies; 291 int *a_ncookies; 292 } */ *ap = v; 293 struct uio *uio = ap->a_uio; 294 struct vnode *vdp = ap->a_vp; 295 struct filecore_node *dp; 296 struct buf *bp = NULL; 297 struct dirent *de; 298 struct filecore_direntry *dep = NULL; 299 int error = 0; 300 off_t *cookies = NULL; 301 int ncookies = 0; 302 int i; 303 off_t uiooff; 304 305 dp = VTOI(vdp); 306 307 if ((dp->i_dirent.attr & FILECORE_ATTR_DIR) == 0) 308 return (ENOTDIR); 309 310 if (uio->uio_offset % FILECORE_DIRENT_SIZE != 0) 311 return (EINVAL); 312 i = uio->uio_offset / FILECORE_DIRENT_SIZE; 313 uiooff = uio->uio_offset; 314 315 *ap->a_eofflag = 0; 316 317 error = filecore_dbread(dp, &bp); 318 if (error) { 319 return error; 320 } 321 322 if (ap->a_ncookies == NULL) 323 cookies = NULL; 324 else { 325 *ap->a_ncookies = 0; 326 ncookies = uio->uio_resid / _DIRENT_MINSIZE((struct dirent *)0); 327 cookies = malloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 328 } 329 330 de = kmem_zalloc(sizeof(struct dirent), KM_SLEEP); 331 332 for (; ; i++) { 333 switch (i) { 334 case 0: 335 /* Fake the '.' entry */ 336 de->d_fileno = dp->i_number; 337 de->d_type = DT_DIR; 338 de->d_namlen = 1; 339 strlcpy(de->d_name, ".", sizeof(de->d_name)); 340 break; 341 case 1: 342 /* Fake the '..' entry */ 343 de->d_fileno = filecore_getparent(dp); 344 de->d_type = DT_DIR; 345 de->d_namlen = 2; 346 strlcpy(de->d_name, "..", sizeof(de->d_name)); 347 break; 348 default: 349 de->d_fileno = dp->i_dirent.addr + 350 ((i - 2) << FILECORE_INO_INDEX); 351 dep = fcdirentry(bp->b_data, i - 2); 352 if (dep->attr & FILECORE_ATTR_DIR) 353 de->d_type = DT_DIR; 354 else 355 de->d_type = DT_REG; 356 if (filecore_fn2unix(dep->name, de->d_name, 357 /*###346 [cc] warning: passing arg 3 of `filecore_fn2unix' from incompatible pointer type%%%*/ 358 &de->d_namlen)) { 359 *ap->a_eofflag = 1; 360 goto out; 361 } 362 break; 363 } 364 de->d_reclen = _DIRENT_SIZE(de); 365 if (uio->uio_resid < de->d_reclen) 366 goto out; 367 error = uiomove(de, de->d_reclen, uio); 368 if (error) 369 goto out; 370 uiooff += FILECORE_DIRENT_SIZE; 371 372 if (cookies) { 373 *cookies++ = i*FILECORE_DIRENT_SIZE; 374 (*ap->a_ncookies)++; 375 if (--ncookies == 0) goto out; 376 } 377 } 378 out: 379 if (cookies) { 380 *ap->a_cookies = cookies; 381 if (error) { 382 free(cookies, M_TEMP); 383 *ap->a_ncookies = 0; 384 *ap->a_cookies = NULL; 385 } 386 } 387 uio->uio_offset = uiooff; 388 389 #ifdef FILECORE_DEBUG_BR 390 printf("brelse(%p) vn3\n", bp); 391 #endif 392 brelse (bp, 0); 393 394 kmem_free(de, sizeof(*de)); 395 396 return (error); 397 } 398 399 /* 400 * Return target name of a symbolic link 401 * Shouldn't we get the parent vnode and read the data from there? 402 * This could eventually result in deadlocks in filecore_lookup. 403 * But otherwise the block read here is in the block buffer two times. 404 */ 405 int 406 filecore_readlink(void *v) 407 { 408 #if 0 409 struct vop_readlink_args /* { 410 struct vnode *a_vp; 411 struct uio *a_uio; 412 kauth_cred_t a_cred; 413 } */ *ap = v; 414 #endif 415 416 return (EINVAL); 417 } 418 419 /* 420 * Calculate the logical to physical mapping if not done already, 421 * then call the device strategy routine. 422 */ 423 int 424 filecore_strategy(void *v) 425 { 426 struct vop_strategy_args /* { 427 struct vnode *a_vp; 428 struct buf *a_bp; 429 } */ *ap = v; 430 struct buf *bp = ap->a_bp; 431 struct vnode *vp = ap->a_vp; 432 struct filecore_node *ip; 433 int error; 434 435 ip = VTOI(vp); 436 if (bp->b_blkno == bp->b_lblkno) { 437 error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL); 438 if (error) { 439 bp->b_error = error; 440 biodone(bp); 441 return (error); 442 } 443 if ((long)bp->b_blkno == -1) 444 clrbuf(bp); 445 } 446 if ((long)bp->b_blkno == -1) { 447 biodone(bp); 448 return (0); 449 } 450 vp = ip->i_devvp; 451 return (VOP_STRATEGY(vp, bp)); 452 } 453 454 /* 455 * Print out the contents of an inode. 456 */ 457 /*ARGSUSED*/ 458 int 459 filecore_print(void *v) 460 { 461 462 printf("tag VT_FILECORE, filecore vnode\n"); 463 return (0); 464 } 465 466 /* 467 * Return POSIX pathconf information applicable to filecore filesystems. 468 */ 469 int 470 filecore_pathconf(void *v) 471 { 472 struct vop_pathconf_args /* { 473 struct vnode *a_vp; 474 int a_name; 475 register_t *a_retval; 476 } */ *ap = v; 477 switch (ap->a_name) { 478 case _PC_LINK_MAX: 479 *ap->a_retval = 1; 480 return (0); 481 case _PC_NAME_MAX: 482 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax; 483 return (0); 484 case _PC_PATH_MAX: 485 *ap->a_retval = 256; 486 return (0); 487 case _PC_CHOWN_RESTRICTED: 488 *ap->a_retval = 1; 489 return (0); 490 case _PC_NO_TRUNC: 491 *ap->a_retval = 1; 492 return (0); 493 case _PC_SYNC_IO: 494 *ap->a_retval = 1; 495 return (0); 496 case _PC_FILESIZEBITS: 497 *ap->a_retval = 32; 498 return (0); 499 default: 500 return genfs_pathconf(ap); 501 } 502 /* NOTREACHED */ 503 } 504 505 /* 506 * Global vfs data structures for filecore 507 */ 508 int (**filecore_vnodeop_p)(void *); 509 const struct vnodeopv_entry_desc filecore_vnodeop_entries[] = { 510 { &vop_default_desc, vn_default_error }, 511 { &vop_parsepath_desc, genfs_parsepath }, /* parsepath */ 512 { &vop_lookup_desc, filecore_lookup }, /* lookup */ 513 { &vop_create_desc, genfs_eopnotsupp }, /* create */ 514 { &vop_mknod_desc, genfs_eopnotsupp }, /* mknod */ 515 { &vop_open_desc, genfs_nullop }, /* open */ 516 { &vop_close_desc, genfs_nullop }, /* close */ 517 { &vop_access_desc, filecore_access }, /* access */ 518 { &vop_accessx_desc, genfs_accessx }, /* accessx */ 519 { &vop_getattr_desc, filecore_getattr }, /* getattr */ 520 { &vop_setattr_desc, genfs_eopnotsupp }, /* setattr */ 521 { &vop_read_desc, filecore_read }, /* read */ 522 { &vop_write_desc, genfs_eopnotsupp }, /* write */ 523 { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ 524 { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ 525 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 526 { &vop_ioctl_desc, genfs_enoioctl }, /* ioctl */ 527 { &vop_poll_desc, genfs_poll }, /* poll */ 528 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 529 { &vop_revoke_desc, genfs_revoke }, /* revoke */ 530 { &vop_mmap_desc, genfs_mmap }, /* mmap */ 531 { &vop_fsync_desc, genfs_nullop }, /* fsync */ 532 { &vop_seek_desc, genfs_seek }, /* seek */ 533 { &vop_remove_desc, genfs_eopnotsupp }, /* remove */ 534 { &vop_link_desc, genfs_erofs_link }, /* link */ 535 { &vop_rename_desc, genfs_eopnotsupp }, /* rename */ 536 { &vop_mkdir_desc, genfs_eopnotsupp }, /* mkdir */ 537 { &vop_rmdir_desc, genfs_eopnotsupp }, /* rmdir */ 538 { &vop_symlink_desc, genfs_erofs_symlink }, /* symlink */ 539 { &vop_readdir_desc, filecore_readdir }, /* readdir */ 540 { &vop_readlink_desc, filecore_readlink }, /* readlink */ 541 { &vop_abortop_desc, genfs_abortop }, /* abortop */ 542 { &vop_inactive_desc, filecore_inactive }, /* inactive */ 543 { &vop_reclaim_desc, filecore_reclaim }, /* reclaim */ 544 { &vop_lock_desc, genfs_lock }, /* lock */ 545 { &vop_unlock_desc, genfs_unlock }, /* unlock */ 546 { &vop_bmap_desc, filecore_bmap }, /* bmap */ 547 { &vop_strategy_desc, filecore_strategy }, /* strategy */ 548 { &vop_print_desc, filecore_print }, /* print */ 549 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 550 { &vop_pathconf_desc, filecore_pathconf }, /* pathconf */ 551 { &vop_advlock_desc, genfs_eopnotsupp }, /* advlock */ 552 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 553 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 554 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 555 { NULL, NULL } 556 }; 557 const struct vnodeopv_desc filecore_vnodeop_opv_desc = 558 { &filecore_vnodeop_p, filecore_vnodeop_entries }; 559
Indexes created Sat Sep 20 22:09:52 GMT 2025