Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/fs/filecorefs/filecore_vnops.c
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1 /* $NetBSD: filecore_vnops.c,v 1.8 2004/01/26 10:39:30 hannken 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 1.8 2004/01/26 10:39:30 hannken 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 86 #include <miscfs/genfs/genfs.h> 87 #include <miscfs/specfs/specdev.h> 88 89 #include <fs/filecorefs/filecore.h> 90 #include <fs/filecorefs/filecore_extern.h> 91 #include <fs/filecorefs/filecore_node.h> 92 93 /* 94 * Check mode permission on inode pointer. Mode is READ, WRITE or EXEC. 95 * The mode is shifted to select the owner/group/other fields. The 96 * super user is granted all permissions. 97 */ 98 int 99 filecore_access(v) 100 void *v; 101 { 102 struct vop_access_args /* { 103 struct vnode *a_vp; 104 int a_mode; 105 struct ucred *a_cred; 106 struct proc *a_p; 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 struct ucred *a_cred; 140 struct proc *a_p; 141 } */ *ap = v; 142 struct vnode *vp = ap->a_vp; 143 struct filecore_node *ip = VTOI(vp); 144 struct vattr *vap = ap->a_vap; 145 struct filecore_mnt *fcmp = ip->i_mnt; 146 147 vap->va_fsid = ip->i_dev; 148 vap->va_fileid = ip->i_number; 149 150 vap->va_mode = filecore_mode(ip); 151 vap->va_nlink = 1; 152 vap->va_uid = fcmp->fc_uid; 153 vap->va_gid = fcmp->fc_gid; 154 vap->va_atime = filecore_time(ip); 155 vap->va_mtime = filecore_time(ip); 156 vap->va_ctime = filecore_time(ip); 157 vap->va_rdev = 0; /* We don't support specials */ 158 159 vap->va_size = (u_quad_t) ip->i_size; 160 vap->va_flags = 0; 161 vap->va_gen = 1; 162 vap->va_blocksize = fcmp->blksize; 163 vap->va_bytes = vap->va_size; 164 vap->va_type = vp->v_type; 165 return (0); 166 } 167 168 /* 169 * Vnode op for reading. 170 */ 171 int 172 filecore_read(v) 173 void *v; 174 { 175 struct vop_read_args /* { 176 struct vnode *a_vp; 177 struct uio *a_uio; 178 int a_ioflag; 179 struct ucred *a_cred; 180 } */ *ap = v; 181 struct vnode *vp = ap->a_vp; 182 struct uio *uio = ap->a_uio; 183 struct filecore_node *ip = VTOI(vp); 184 struct filecore_mnt *fcmp; 185 struct buf *bp; 186 daddr_t lbn, rablock; 187 off_t diff; 188 int error = 0; 189 long size, n, on; 190 191 if (uio->uio_resid == 0) 192 return (0); 193 if (uio->uio_offset < 0) 194 return (EINVAL); 195 if (uio->uio_offset >= ip->i_size) 196 return (0); 197 ip->i_flag |= IN_ACCESS; 198 fcmp = ip->i_mnt; 199 200 if (vp->v_type == VREG) { 201 error = 0; 202 while (uio->uio_resid > 0) { 203 void *win; 204 vsize_t bytelen = MIN(ip->i_size - uio->uio_offset, 205 uio->uio_resid); 206 207 if (bytelen == 0) { 208 break; 209 } 210 win = ubc_alloc(&vp->v_uobj, uio->uio_offset, 211 &bytelen, UBC_READ); 212 error = uiomove(win, bytelen, uio); 213 ubc_release(win, 0); 214 if (error) { 215 break; 216 } 217 } 218 goto out; 219 } 220 221 do { 222 lbn = lblkno(fcmp, uio->uio_offset); 223 on = blkoff(fcmp, uio->uio_offset); 224 n = MIN(blksize(fcmp, ip, lbn) - on, uio->uio_resid); 225 diff = (off_t)ip->i_size - uio->uio_offset; 226 if (diff <= 0) 227 return (0); 228 if (diff < n) 229 n = diff; 230 size = blksize(fcmp, ip, lbn); 231 rablock = lbn + 1; 232 if (ip->i_dirent.attr & FILECORE_ATTR_DIR) { 233 error = filecore_dbread(ip, &bp); 234 on = uio->uio_offset; 235 n = MIN(FILECORE_DIR_SIZE - on, uio->uio_resid); 236 size = FILECORE_DIR_SIZE; 237 } else { 238 error = bread(vp, lbn, size, NOCRED, &bp); 239 #ifdef FILECORE_DEBUG_BR 240 printf("bread(%p, %x, %ld, CRED, %p)=%d\n", 241 vp, lbn, size, bp, error); 242 #endif 243 } 244 n = MIN(n, size - bp->b_resid); 245 if (error) { 246 #ifdef FILECORE_DEBUG_BR 247 printf("brelse(%p) vn1\n", bp); 248 #endif 249 brelse(bp); 250 return (error); 251 } 252 253 error = uiomove(bp->b_data + on, (int)n, uio); 254 #ifdef FILECORE_DEBUG_BR 255 printf("brelse(%p) vn2\n", bp); 256 #endif 257 brelse(bp); 258 } while (error == 0 && uio->uio_resid > 0 && n != 0); 259 260 out: 261 return (error); 262 } 263 264 /* 265 * Vnode op for readdir 266 */ 267 int 268 filecore_readdir(v) 269 void *v; 270 { 271 struct vop_readdir_args /* { 272 struct vnode *a_vp; 273 struct uio *a_uio; 274 struct ucred *a_cred; 275 int *a_eofflag; 276 off_t **a_cookies; 277 int *a_ncookies; 278 } */ *ap = v; 279 struct uio *uio = ap->a_uio; 280 struct vnode *vdp = ap->a_vp; 281 struct filecore_node *dp; 282 struct filecore_mnt *fcmp; 283 struct buf *bp = NULL; 284 struct dirent de; 285 struct filecore_direntry *dep = NULL; 286 int error = 0; 287 off_t *cookies = NULL; 288 int ncookies = 0; 289 int i; 290 off_t uiooff; 291 292 dp = VTOI(vdp); 293 294 if ((dp->i_dirent.attr & FILECORE_ATTR_DIR) == 0) 295 return (ENOTDIR); 296 297 if (uio->uio_offset % FILECORE_DIRENT_SIZE != 0) 298 return (EINVAL); 299 i = uio->uio_offset / FILECORE_DIRENT_SIZE; 300 uiooff = uio->uio_offset; 301 302 *ap->a_eofflag = 0; 303 fcmp = dp->i_mnt; 304 305 error = filecore_dbread(dp, &bp); 306 if (error) { 307 brelse(bp); 308 return error; 309 } 310 311 if (ap->a_ncookies == NULL) 312 cookies = NULL; 313 else { 314 *ap->a_ncookies = 0; 315 ncookies = uio->uio_resid/16; 316 cookies = malloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 317 } 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 &de.d_namlen)) { 345 *ap->a_eofflag = 1; 346 goto out; 347 } 348 break; 349 } 350 de.d_reclen = DIRENT_SIZE(&de); 351 if (uio->uio_resid < de.d_reclen) 352 goto out; 353 error = uiomove((caddr_t) &de, de.d_reclen, uio); 354 if (error) 355 goto out; 356 uiooff += FILECORE_DIRENT_SIZE; 357 358 if (cookies) { 359 *cookies++ = i*FILECORE_DIRENT_SIZE; 360 (*ap->a_ncookies)++; 361 if (--ncookies == 0) goto out; 362 } 363 } 364 out: 365 if (cookies) { 366 *ap->a_cookies = cookies; 367 if (error) { 368 free(cookies, M_TEMP); 369 *ap->a_ncookies = 0; 370 *ap->a_cookies = NULL; 371 } 372 } 373 uio->uio_offset = uiooff; 374 375 #ifdef FILECORE_DEBUG_BR 376 printf("brelse(%p) vn3\n", bp); 377 #endif 378 brelse (bp); 379 380 return (error); 381 } 382 383 /* 384 * Return target name of a symbolic link 385 * Shouldn't we get the parent vnode and read the data from there? 386 * This could eventually result in deadlocks in filecore_lookup. 387 * But otherwise the block read here is in the block buffer two times. 388 */ 389 int 390 filecore_readlink(v) 391 void *v; 392 { 393 #if 0 394 struct vop_readlink_args /* { 395 struct vnode *a_vp; 396 struct uio *a_uio; 397 struct ucred *a_cred; 398 } */ *ap = v; 399 #endif 400 401 return (EINVAL); 402 } 403 404 int 405 filecore_link(v) 406 void *v; 407 { 408 struct vop_link_args /* { 409 struct vnode *a_dvp; 410 struct vnode *a_vp; 411 struct componentname *a_cnp; 412 } */ *ap = v; 413 414 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 415 vput(ap->a_dvp); 416 return (EROFS); 417 } 418 419 int 420 filecore_symlink(v) 421 void *v; 422 { 423 struct vop_symlink_args /* { 424 struct vnode *a_dvp; 425 struct vnode **a_vpp; 426 struct componentname *a_cnp; 427 struct vattr *a_vap; 428 char *a_target; 429 } */ *ap = v; 430 431 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 432 vput(ap->a_dvp); 433 return (EROFS); 434 } 435 436 /* 437 * Calculate the logical to physical mapping if not done already, 438 * then call the device strategy routine. 439 */ 440 int 441 filecore_strategy(v) 442 void *v; 443 { 444 struct vop_strategy_args /* { 445 struct vnode *a_vp; 446 struct buf *a_bp; 447 } */ *ap = v; 448 struct buf *bp = ap->a_bp; 449 struct vnode *vp = ap->a_vp; 450 struct filecore_node *ip; 451 int error; 452 453 ip = VTOI(vp); 454 if (bp->b_blkno == bp->b_lblkno) { 455 error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL); 456 if (error) { 457 bp->b_error = error; 458 bp->b_flags |= B_ERROR; 459 biodone(bp); 460 return (error); 461 } 462 if ((long)bp->b_blkno == -1) 463 clrbuf(bp); 464 } 465 if ((long)bp->b_blkno == -1) { 466 biodone(bp); 467 return (0); 468 } 469 vp = ip->i_devvp; 470 return (VOP_STRATEGY(vp, bp)); 471 } 472 473 /* 474 * Print out the contents of an inode. 475 */ 476 /*ARGSUSED*/ 477 int 478 filecore_print(v) 479 void *v; 480 { 481 482 printf("tag VT_FILECORE, filecore vnode\n"); 483 return (0); 484 } 485 486 /* 487 * Return POSIX pathconf information applicable to filecore filesystems. 488 */ 489 int 490 filecore_pathconf(v) 491 void *v; 492 { 493 struct vop_pathconf_args /* { 494 struct vnode *a_vp; 495 int a_name; 496 register_t *a_retval; 497 } */ *ap = v; 498 switch (ap->a_name) { 499 case _PC_LINK_MAX: 500 *ap->a_retval = 1; 501 return (0); 502 case _PC_NAME_MAX: 503 *ap->a_retval = 10; 504 return (0); 505 case _PC_PATH_MAX: 506 *ap->a_retval = 256; 507 return (0); 508 case _PC_CHOWN_RESTRICTED: 509 *ap->a_retval = 1; 510 return (0); 511 case _PC_NO_TRUNC: 512 *ap->a_retval = 1; 513 return (0); 514 case _PC_SYNC_IO: 515 *ap->a_retval = 1; 516 return (0); 517 case _PC_FILESIZEBITS: 518 *ap->a_retval = 32; 519 return (0); 520 default: 521 return (EINVAL); 522 } 523 /* NOTREACHED */ 524 } 525 526 /* 527 * Global vfs data structures for isofs 528 */ 529 #define filecore_create genfs_eopnotsupp 530 #define filecore_mknod genfs_eopnotsupp 531 #define filecore_write genfs_eopnotsupp 532 #define filecore_setattr genfs_eopnotsupp 533 #define filecore_lease_check genfs_lease_check 534 #define filecore_fcntl genfs_fcntl 535 #define filecore_ioctl genfs_enoioctl 536 #define filecore_fsync genfs_nullop 537 #define filecore_remove genfs_eopnotsupp 538 #define filecore_rename genfs_eopnotsupp 539 #define filecore_mkdir genfs_eopnotsupp 540 #define filecore_rmdir genfs_eopnotsupp 541 #define filecore_advlock genfs_eopnotsupp 542 #define filecore_valloc genfs_eopnotsupp 543 #define filecore_vfree genfs_nullop 544 #define filecore_truncate genfs_eopnotsupp 545 #define filecore_update genfs_nullop 546 #define filecore_bwrite genfs_eopnotsupp 547 #define filecore_revoke genfs_revoke 548 #define filecore_blkatoff genfs_eopnotsupp 549 550 /* 551 * Global vfs data structures for filecore 552 */ 553 int (**filecore_vnodeop_p) __P((void *)); 554 const struct vnodeopv_entry_desc filecore_vnodeop_entries[] = { 555 { &vop_default_desc, vn_default_error }, 556 { &vop_lookup_desc, filecore_lookup }, /* lookup */ 557 { &vop_create_desc, filecore_create }, /* create */ 558 { &vop_mknod_desc, filecore_mknod }, /* mknod */ 559 { &vop_open_desc, filecore_open }, /* open */ 560 { &vop_close_desc, filecore_close }, /* close */ 561 { &vop_access_desc, filecore_access }, /* access */ 562 { &vop_getattr_desc, filecore_getattr }, /* getattr */ 563 { &vop_setattr_desc, filecore_setattr }, /* setattr */ 564 { &vop_read_desc, filecore_read }, /* read */ 565 { &vop_write_desc, filecore_write }, /* write */ 566 { &vop_lease_desc, filecore_lease_check }, /* lease */ 567 { &vop_fcntl_desc, filecore_fcntl }, /* fcntl */ 568 { &vop_ioctl_desc, filecore_ioctl }, /* ioctl */ 569 { &vop_poll_desc, filecore_poll }, /* poll */ 570 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 571 { &vop_revoke_desc, filecore_revoke }, /* revoke */ 572 { &vop_mmap_desc, filecore_mmap }, /* mmap */ 573 { &vop_fsync_desc, filecore_fsync }, /* fsync */ 574 { &vop_seek_desc, filecore_seek }, /* seek */ 575 { &vop_remove_desc, filecore_remove }, /* remove */ 576 { &vop_link_desc, filecore_link }, /* link */ 577 { &vop_rename_desc, filecore_rename }, /* rename */ 578 { &vop_mkdir_desc, filecore_mkdir }, /* mkdir */ 579 { &vop_rmdir_desc, filecore_rmdir }, /* rmdir */ 580 { &vop_symlink_desc, filecore_symlink }, /* symlink */ 581 { &vop_readdir_desc, filecore_readdir }, /* readdir */ 582 { &vop_readlink_desc, filecore_readlink }, /* readlink */ 583 { &vop_abortop_desc, filecore_abortop }, /* abortop */ 584 { &vop_inactive_desc, filecore_inactive }, /* inactive */ 585 { &vop_reclaim_desc, filecore_reclaim }, /* reclaim */ 586 { &vop_lock_desc, genfs_lock }, /* lock */ 587 { &vop_unlock_desc, genfs_unlock }, /* unlock */ 588 { &vop_bmap_desc, filecore_bmap }, /* bmap */ 589 { &vop_strategy_desc, filecore_strategy }, /* strategy */ 590 { &vop_print_desc, filecore_print }, /* print */ 591 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 592 { &vop_pathconf_desc, filecore_pathconf }, /* pathconf */ 593 { &vop_advlock_desc, filecore_advlock }, /* advlock */ 594 { &vop_blkatoff_desc, filecore_blkatoff }, /* blkatoff */ 595 { &vop_valloc_desc, filecore_valloc }, /* valloc */ 596 { &vop_vfree_desc, filecore_vfree }, /* vfree */ 597 { &vop_truncate_desc, filecore_truncate }, /* truncate */ 598 { &vop_update_desc, filecore_update }, /* update */ 599 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 600 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 601 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 602 { NULL, NULL } 603 }; 604 const struct vnodeopv_desc filecore_vnodeop_opv_desc = 605 { &filecore_vnodeop_p, filecore_vnodeop_entries };
Cache object: 90d1f5ec7b6d6dcd6f81ee92002a0416
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