filecore_vnops.c revision 1.1.2.2
1 /* $NetBSD: filecore_vnops.c,v 1.1.2.2 2002/12/29 19:55:53 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 Andrew McMurry 5 * Copyright (c) 1994 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * filecore_vnops.c 1.2 1998/8/18 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: filecore_vnops.c,v 1.1.2.2 2002/12/29 19:55:53 thorpej Exp $"); 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/namei.h> 45 #include <sys/resourcevar.h> 46 #include <sys/kernel.h> 47 #include <sys/file.h> 48 #include <sys/stat.h> 49 #include <sys/buf.h> 50 #include <sys/proc.h> 51 #include <sys/conf.h> 52 #include <sys/mount.h> 53 #include <sys/vnode.h> 54 #include <sys/malloc.h> 55 #include <sys/dirent.h> 56 57 #include <miscfs/genfs/genfs.h> 58 #include <miscfs/specfs/specdev.h> 59 60 #include <fs/filecorefs/filecore.h> 61 #include <fs/filecorefs/filecore_extern.h> 62 #include <fs/filecorefs/filecore_node.h> 63 64 /* 65 * Check mode permission on inode pointer. Mode is READ, WRITE or EXEC. 66 * The mode is shifted to select the owner/group/other fields. The 67 * super user is granted all permissions. 68 */ 69 int 70 filecore_access(v) 71 void *v; 72 { 73 struct vop_access_args /* { 74 struct vnode *a_vp; 75 int a_mode; 76 struct ucred *a_cred; 77 struct proc *a_p; 78 } */ *ap = v; 79 struct vnode *vp = ap->a_vp; 80 struct filecore_node *ip = VTOI(vp); 81 struct filecore_mnt *fcmp = ip->i_mnt; 82 83 /* 84 * Disallow write attempts unless the file is a socket, 85 * fifo, or a block or character device resident on the 86 * file system. 87 */ 88 if (ap->a_mode & VWRITE) { 89 switch (vp->v_type) { 90 case VDIR: 91 case VLNK: 92 case VREG: 93 return (EROFS); 94 default: 95 break; 96 } 97 } 98 99 return (vaccess(vp->v_type, filecore_mode(ip), 100 fcmp->fc_uid, fcmp->fc_gid, ap->a_mode, ap->a_cred)); 101 } 102 103 int 104 filecore_getattr(v) 105 void *v; 106 { 107 struct vop_getattr_args /* { 108 struct vnode *a_vp; 109 struct vattr *a_vap; 110 struct ucred *a_cred; 111 struct proc *a_p; 112 } */ *ap = v; 113 struct vnode *vp = ap->a_vp; 114 struct filecore_node *ip = VTOI(vp); 115 struct vattr *vap = ap->a_vap; 116 struct filecore_mnt *fcmp = ip->i_mnt; 117 118 vap->va_fsid = ip->i_dev; 119 vap->va_fileid = ip->i_number; 120 121 vap->va_mode = filecore_mode(ip); 122 vap->va_nlink = 1; 123 vap->va_uid = fcmp->fc_uid; 124 vap->va_gid = fcmp->fc_gid; 125 vap->va_atime = filecore_time(ip); 126 vap->va_mtime = filecore_time(ip); 127 vap->va_ctime = filecore_time(ip); 128 vap->va_rdev = 0; /* We don't support specials */ 129 130 vap->va_size = (u_quad_t) ip->i_size; 131 vap->va_flags = 0; 132 vap->va_gen = 1; 133 vap->va_blocksize = fcmp->blksize; 134 vap->va_bytes = vap->va_size; 135 vap->va_type = vp->v_type; 136 return (0); 137 } 138 139 /* 140 * Vnode op for reading. 141 */ 142 int 143 filecore_read(v) 144 void *v; 145 { 146 struct vop_read_args /* { 147 struct vnode *a_vp; 148 struct uio *a_uio; 149 int a_ioflag; 150 struct ucred *a_cred; 151 } */ *ap = v; 152 struct vnode *vp = ap->a_vp; 153 struct uio *uio = ap->a_uio; 154 struct filecore_node *ip = VTOI(vp); 155 struct filecore_mnt *fcmp; 156 struct buf *bp; 157 daddr_t lbn, rablock; 158 off_t diff; 159 int error = 0; 160 long size, n, on; 161 162 if (uio->uio_resid == 0) 163 return (0); 164 if (uio->uio_offset < 0) 165 return (EINVAL); 166 if (uio->uio_offset >= ip->i_size) 167 return (0); 168 ip->i_flag |= IN_ACCESS; 169 fcmp = ip->i_mnt; 170 171 if (vp->v_type == VREG) { 172 error = 0; 173 while (uio->uio_resid > 0) { 174 void *win; 175 vsize_t bytelen = MIN(ip->i_size - uio->uio_offset, 176 uio->uio_resid); 177 178 if (bytelen == 0) { 179 break; 180 } 181 win = ubc_alloc(&vp->v_uobj, uio->uio_offset, 182 &bytelen, UBC_READ); 183 error = uiomove(win, bytelen, uio); 184 ubc_release(win, 0); 185 if (error) { 186 break; 187 } 188 } 189 goto out; 190 } 191 192 do { 193 lbn = lblkno(fcmp, uio->uio_offset); 194 on = blkoff(fcmp, uio->uio_offset); 195 n = MIN(blksize(fcmp, ip, lbn) - on, uio->uio_resid); 196 diff = (off_t)ip->i_size - uio->uio_offset; 197 if (diff <= 0) 198 return (0); 199 if (diff < n) 200 n = diff; 201 size = blksize(fcmp, ip, lbn); 202 rablock = lbn + 1; 203 if (ip->i_dirent.attr & FILECORE_ATTR_DIR) { 204 error = filecore_dbread(ip, &bp); 205 on = uio->uio_offset; 206 n = MIN(FILECORE_DIR_SIZE - on, uio->uio_resid); 207 size = FILECORE_DIR_SIZE; 208 } else { 209 error = bread(vp, lbn, size, NOCRED, &bp); 210 #ifdef FILECORE_DEBUG_BR 211 printf("bread(%p, %x, %ld, CRED, %p)=%d\n", 212 vp, lbn, size, bp, error); 213 #endif 214 } 215 n = MIN(n, size - bp->b_resid); 216 if (error) { 217 #ifdef FILECORE_DEBUG_BR 218 printf("brelse(%p) vn1\n", bp); 219 #endif 220 brelse(bp); 221 return (error); 222 } 223 224 error = uiomove(bp->b_data + on, (int)n, uio); 225 #ifdef FILECORE_DEBUG_BR 226 printf("brelse(%p) vn2\n", bp); 227 #endif 228 brelse(bp); 229 } while (error == 0 && uio->uio_resid > 0 && n != 0); 230 231 out: 232 return (error); 233 } 234 235 /* 236 * Vnode op for readdir 237 */ 238 int 239 filecore_readdir(v) 240 void *v; 241 { 242 struct vop_readdir_args /* { 243 struct vnode *a_vp; 244 struct uio *a_uio; 245 struct ucred *a_cred; 246 int *a_eofflag; 247 off_t **a_cookies; 248 int *a_ncookies; 249 } */ *ap = v; 250 struct uio *uio = ap->a_uio; 251 struct vnode *vdp = ap->a_vp; 252 struct filecore_node *dp; 253 struct filecore_mnt *fcmp; 254 struct buf *bp = NULL; 255 struct dirent de; 256 struct filecore_direntry *dep = NULL; 257 int error = 0; 258 off_t *cookies = NULL; 259 int ncookies = 0; 260 int i; 261 off_t uiooff; 262 263 dp = VTOI(vdp); 264 265 if ((dp->i_dirent.attr & FILECORE_ATTR_DIR) == 0) 266 return (ENOTDIR); 267 268 if (uio->uio_offset % FILECORE_DIRENT_SIZE != 0) 269 return (EINVAL); 270 i = uio->uio_offset / FILECORE_DIRENT_SIZE; 271 uiooff = uio->uio_offset; 272 273 *ap->a_eofflag = 0; 274 fcmp = dp->i_mnt; 275 276 error = filecore_dbread(dp, &bp); 277 if (error) { 278 brelse(bp); 279 return error; 280 } 281 282 if (ap->a_ncookies == NULL) 283 cookies = NULL; 284 else { 285 *ap->a_ncookies = 0; 286 ncookies = uio->uio_resid/16; 287 cookies = malloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 288 } 289 290 for (; ; i++) { 291 switch (i) { 292 case 0: 293 /* Fake the '.' entry */ 294 de.d_fileno = dp->i_number; 295 de.d_type = DT_DIR; 296 de.d_namlen = 1; 297 strcpy(de.d_name, "."); 298 break; 299 case 1: 300 /* Fake the '..' entry */ 301 de.d_fileno = filecore_getparent(dp); 302 de.d_type = DT_DIR; 303 de.d_namlen = 2; 304 strcpy(de.d_name, ".."); 305 break; 306 default: 307 de.d_fileno = dp->i_dirent.addr + 308 ((i - 2) << FILECORE_INO_INDEX); 309 dep = fcdirentry(bp->b_data, i - 2); 310 if (dep->attr & FILECORE_ATTR_DIR) 311 de.d_type = DT_DIR; 312 else 313 de.d_type = DT_REG; 314 if (filecore_fn2unix(dep->name, de.d_name, 315 &de.d_namlen)) { 316 *ap->a_eofflag = 1; 317 goto out; 318 } 319 break; 320 } 321 de.d_reclen = DIRENT_SIZE(&de); 322 if (uio->uio_resid < de.d_reclen) 323 goto out; 324 error = uiomove((caddr_t) &de, de.d_reclen, uio); 325 if (error) 326 goto out; 327 uiooff += FILECORE_DIRENT_SIZE; 328 329 if (cookies) { 330 *cookies++ = i*FILECORE_DIRENT_SIZE; 331 (*ap->a_ncookies)++; 332 if (--ncookies == 0) goto out; 333 } 334 } 335 out: 336 if (cookies) { 337 *ap->a_cookies = cookies; 338 if (error) { 339 free(cookies, M_TEMP); 340 *ap->a_ncookies = 0; 341 *ap->a_cookies = NULL; 342 } 343 } 344 uio->uio_offset = uiooff; 345 346 #ifdef FILECORE_DEBUG_BR 347 printf("brelse(%p) vn3\n", bp); 348 #endif 349 brelse (bp); 350 351 return (error); 352 } 353 354 /* 355 * Return target name of a symbolic link 356 * Shouldn't we get the parent vnode and read the data from there? 357 * This could eventually result in deadlocks in filecore_lookup. 358 * But otherwise the block read here is in the block buffer two times. 359 */ 360 int 361 filecore_readlink(v) 362 void *v; 363 { 364 #if 0 365 struct vop_readlink_args /* { 366 struct vnode *a_vp; 367 struct uio *a_uio; 368 struct ucred *a_cred; 369 } */ *ap = v; 370 #endif 371 372 return (EINVAL); 373 } 374 375 int 376 filecore_link(v) 377 void *v; 378 { 379 struct vop_link_args /* { 380 struct vnode *a_dvp; 381 struct vnode *a_vp; 382 struct componentname *a_cnp; 383 } */ *ap = v; 384 385 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 386 vput(ap->a_dvp); 387 return (EROFS); 388 } 389 390 int 391 filecore_symlink(v) 392 void *v; 393 { 394 struct vop_symlink_args /* { 395 struct vnode *a_dvp; 396 struct vnode **a_vpp; 397 struct componentname *a_cnp; 398 struct vattr *a_vap; 399 char *a_target; 400 } */ *ap = v; 401 402 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 403 vput(ap->a_dvp); 404 return (EROFS); 405 } 406 407 /* 408 * Calculate the logical to physical mapping if not done already, 409 * then call the device strategy routine. 410 */ 411 int 412 filecore_strategy(v) 413 void *v; 414 { 415 struct vop_strategy_args /* { 416 struct buf *a_bp; 417 } */ *ap = v; 418 struct buf *bp = ap->a_bp; 419 struct vnode *vp = bp->b_vp; 420 struct filecore_node *ip; 421 int error; 422 423 ip = VTOI(vp); 424 if (bp->b_blkno == bp->b_lblkno) { 425 error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL); 426 if (error) { 427 bp->b_error = error; 428 bp->b_flags |= B_ERROR; 429 biodone(bp); 430 return (error); 431 } 432 if ((long)bp->b_blkno == -1) 433 clrbuf(bp); 434 } 435 if ((long)bp->b_blkno == -1) { 436 biodone(bp); 437 return (0); 438 } 439 vp = ip->i_devvp; 440 bp->b_dev = vp->v_rdev; 441 VOCALL (vp->v_op, VOFFSET(vop_strategy), ap); 442 return (0); 443 } 444 445 /* 446 * Print out the contents of an inode. 447 */ 448 /*ARGSUSED*/ 449 int 450 filecore_print(v) 451 void *v; 452 { 453 454 printf("tag VT_FILECORE, filecore vnode\n"); 455 return (0); 456 } 457 458 /* 459 * Return POSIX pathconf information applicable to filecore filesystems. 460 */ 461 int 462 filecore_pathconf(v) 463 void *v; 464 { 465 struct vop_pathconf_args /* { 466 struct vnode *a_vp; 467 int a_name; 468 register_t *a_retval; 469 } */ *ap = v; 470 switch (ap->a_name) { 471 case _PC_LINK_MAX: 472 *ap->a_retval = 1; 473 return (0); 474 case _PC_NAME_MAX: 475 *ap->a_retval = 10; 476 return (0); 477 case _PC_PATH_MAX: 478 *ap->a_retval = 256; 479 return (0); 480 case _PC_CHOWN_RESTRICTED: 481 *ap->a_retval = 1; 482 return (0); 483 case _PC_NO_TRUNC: 484 *ap->a_retval = 1; 485 return (0); 486 case _PC_SYNC_IO: 487 *ap->a_retval = 1; 488 return (0); 489 case _PC_FILESIZEBITS: 490 *ap->a_retval = 32; 491 return (0); 492 default: 493 return (EINVAL); 494 } 495 /* NOTREACHED */ 496 } 497 498 /* 499 * Global vfs data structures for isofs 500 */ 501 #define filecore_create genfs_eopnotsupp 502 #define filecore_mknod genfs_eopnotsupp 503 #define filecore_write genfs_eopnotsupp 504 #define filecore_setattr genfs_eopnotsupp 505 #ifdef NFSSERVER 506 int lease_check __P((void *)); 507 #define filecore_lease_check lease_check 508 #else 509 #define filecore_lease_check genfs_nullop 510 #endif 511 #define filecore_fcntl genfs_fcntl 512 #define filecore_ioctl genfs_enoioctl 513 #define filecore_fsync genfs_nullop 514 #define filecore_remove genfs_eopnotsupp 515 #define filecore_rename genfs_eopnotsupp 516 #define filecore_mkdir genfs_eopnotsupp 517 #define filecore_rmdir genfs_eopnotsupp 518 #define filecore_advlock genfs_eopnotsupp 519 #define filecore_valloc genfs_eopnotsupp 520 #define filecore_vfree genfs_nullop 521 #define filecore_truncate genfs_eopnotsupp 522 #define filecore_update genfs_nullop 523 #define filecore_bwrite genfs_eopnotsupp 524 #define filecore_revoke genfs_revoke 525 #define filecore_blkatoff genfs_eopnotsupp 526 527 /* 528 * Global vfs data structures for filecore 529 */ 530 int (**filecore_vnodeop_p) __P((void *)); 531 const struct vnodeopv_entry_desc filecore_vnodeop_entries[] = { 532 { &vop_default_desc, vn_default_error }, 533 { &vop_lookup_desc, filecore_lookup }, /* lookup */ 534 { &vop_create_desc, filecore_create }, /* create */ 535 { &vop_mknod_desc, filecore_mknod }, /* mknod */ 536 { &vop_open_desc, filecore_open }, /* open */ 537 { &vop_close_desc, filecore_close }, /* close */ 538 { &vop_access_desc, filecore_access }, /* access */ 539 { &vop_getattr_desc, filecore_getattr }, /* getattr */ 540 { &vop_setattr_desc, filecore_setattr }, /* setattr */ 541 { &vop_read_desc, filecore_read }, /* read */ 542 { &vop_write_desc, filecore_write }, /* write */ 543 { &vop_lease_desc, filecore_lease_check }, /* lease */ 544 { &vop_fcntl_desc, filecore_fcntl }, /* fcntl */ 545 { &vop_ioctl_desc, filecore_ioctl }, /* ioctl */ 546 { &vop_poll_desc, filecore_poll }, /* poll */ 547 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 548 { &vop_revoke_desc, filecore_revoke }, /* revoke */ 549 { &vop_mmap_desc, filecore_mmap }, /* mmap */ 550 { &vop_fsync_desc, filecore_fsync }, /* fsync */ 551 { &vop_seek_desc, filecore_seek }, /* seek */ 552 { &vop_remove_desc, filecore_remove }, /* remove */ 553 { &vop_link_desc, filecore_link }, /* link */ 554 { &vop_rename_desc, filecore_rename }, /* rename */ 555 { &vop_mkdir_desc, filecore_mkdir }, /* mkdir */ 556 { &vop_rmdir_desc, filecore_rmdir }, /* rmdir */ 557 { &vop_symlink_desc, filecore_symlink }, /* symlink */ 558 { &vop_readdir_desc, filecore_readdir }, /* readdir */ 559 { &vop_readlink_desc, filecore_readlink }, /* readlink */ 560 { &vop_abortop_desc, filecore_abortop }, /* abortop */ 561 { &vop_inactive_desc, filecore_inactive }, /* inactive */ 562 { &vop_reclaim_desc, filecore_reclaim }, /* reclaim */ 563 { &vop_lock_desc, genfs_lock }, /* lock */ 564 { &vop_unlock_desc, genfs_unlock }, /* unlock */ 565 { &vop_bmap_desc, filecore_bmap }, /* bmap */ 566 { &vop_strategy_desc, filecore_strategy }, /* strategy */ 567 { &vop_print_desc, filecore_print }, /* print */ 568 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 569 { &vop_pathconf_desc, filecore_pathconf }, /* pathconf */ 570 { &vop_advlock_desc, filecore_advlock }, /* advlock */ 571 { &vop_blkatoff_desc, filecore_blkatoff }, /* blkatoff */ 572 { &vop_valloc_desc, filecore_valloc }, /* valloc */ 573 { &vop_vfree_desc, filecore_vfree }, /* vfree */ 574 { &vop_truncate_desc, filecore_truncate }, /* truncate */ 575 { &vop_update_desc, filecore_update }, /* update */ 576 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 577 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 578 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 579 { NULL, NULL } 580 }; 581 const struct vnodeopv_desc filecore_vnodeop_opv_desc = 582 { &filecore_vnodeop_p, filecore_vnodeop_entries }; 583
Indexes created Wed Oct 15 03:09:54 GMT 2025