filecore_vnops.c revision 1.4
1 /* $NetBSD: filecore_vnops.c,v 1.4 2003/06/26 05:26:45 itojun 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 1.4 2003/06/26 05:26:45 itojun Exp $"); 41 42 #ifdef _KERNEL_OPT 43 #include "opt_nfsserver.h" 44 #endif 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/namei.h> 49 #include <sys/resourcevar.h> 50 #include <sys/kernel.h> 51 #include <sys/file.h> 52 #include <sys/stat.h> 53 #include <sys/buf.h> 54 #include <sys/proc.h> 55 #include <sys/conf.h> 56 #include <sys/mount.h> 57 #include <sys/vnode.h> 58 #include <sys/malloc.h> 59 #include <sys/dirent.h> 60 61 #include <miscfs/genfs/genfs.h> 62 #include <miscfs/specfs/specdev.h> 63 64 #include <fs/filecorefs/filecore.h> 65 #include <fs/filecorefs/filecore_extern.h> 66 #include <fs/filecorefs/filecore_node.h> 67 68 /* 69 * Check mode permission on inode pointer. Mode is READ, WRITE or EXEC. 70 * The mode is shifted to select the owner/group/other fields. The 71 * super user is granted all permissions. 72 */ 73 int 74 filecore_access(v) 75 void *v; 76 { 77 struct vop_access_args /* { 78 struct vnode *a_vp; 79 int a_mode; 80 struct ucred *a_cred; 81 struct proc *a_p; 82 } */ *ap = v; 83 struct vnode *vp = ap->a_vp; 84 struct filecore_node *ip = VTOI(vp); 85 struct filecore_mnt *fcmp = ip->i_mnt; 86 87 /* 88 * Disallow write attempts unless the file is a socket, 89 * fifo, or a block or character device resident on the 90 * file system. 91 */ 92 if (ap->a_mode & VWRITE) { 93 switch (vp->v_type) { 94 case VDIR: 95 case VLNK: 96 case VREG: 97 return (EROFS); 98 default: 99 break; 100 } 101 } 102 103 return (vaccess(vp->v_type, filecore_mode(ip), 104 fcmp->fc_uid, fcmp->fc_gid, ap->a_mode, ap->a_cred)); 105 } 106 107 int 108 filecore_getattr(v) 109 void *v; 110 { 111 struct vop_getattr_args /* { 112 struct vnode *a_vp; 113 struct vattr *a_vap; 114 struct ucred *a_cred; 115 struct proc *a_p; 116 } */ *ap = v; 117 struct vnode *vp = ap->a_vp; 118 struct filecore_node *ip = VTOI(vp); 119 struct vattr *vap = ap->a_vap; 120 struct filecore_mnt *fcmp = ip->i_mnt; 121 122 vap->va_fsid = ip->i_dev; 123 vap->va_fileid = ip->i_number; 124 125 vap->va_mode = filecore_mode(ip); 126 vap->va_nlink = 1; 127 vap->va_uid = fcmp->fc_uid; 128 vap->va_gid = fcmp->fc_gid; 129 vap->va_atime = filecore_time(ip); 130 vap->va_mtime = filecore_time(ip); 131 vap->va_ctime = filecore_time(ip); 132 vap->va_rdev = 0; /* We don't support specials */ 133 134 vap->va_size = (u_quad_t) ip->i_size; 135 vap->va_flags = 0; 136 vap->va_gen = 1; 137 vap->va_blocksize = fcmp->blksize; 138 vap->va_bytes = vap->va_size; 139 vap->va_type = vp->v_type; 140 return (0); 141 } 142 143 /* 144 * Vnode op for reading. 145 */ 146 int 147 filecore_read(v) 148 void *v; 149 { 150 struct vop_read_args /* { 151 struct vnode *a_vp; 152 struct uio *a_uio; 153 int a_ioflag; 154 struct ucred *a_cred; 155 } */ *ap = v; 156 struct vnode *vp = ap->a_vp; 157 struct uio *uio = ap->a_uio; 158 struct filecore_node *ip = VTOI(vp); 159 struct filecore_mnt *fcmp; 160 struct buf *bp; 161 daddr_t lbn, rablock; 162 off_t diff; 163 int error = 0; 164 long size, n, on; 165 166 if (uio->uio_resid == 0) 167 return (0); 168 if (uio->uio_offset < 0) 169 return (EINVAL); 170 if (uio->uio_offset >= ip->i_size) 171 return (0); 172 ip->i_flag |= IN_ACCESS; 173 fcmp = ip->i_mnt; 174 175 if (vp->v_type == VREG) { 176 error = 0; 177 while (uio->uio_resid > 0) { 178 void *win; 179 vsize_t bytelen = MIN(ip->i_size - uio->uio_offset, 180 uio->uio_resid); 181 182 if (bytelen == 0) { 183 break; 184 } 185 win = ubc_alloc(&vp->v_uobj, uio->uio_offset, 186 &bytelen, UBC_READ); 187 error = uiomove(win, bytelen, uio); 188 ubc_release(win, 0); 189 if (error) { 190 break; 191 } 192 } 193 goto out; 194 } 195 196 do { 197 lbn = lblkno(fcmp, uio->uio_offset); 198 on = blkoff(fcmp, uio->uio_offset); 199 n = MIN(blksize(fcmp, ip, lbn) - on, uio->uio_resid); 200 diff = (off_t)ip->i_size - uio->uio_offset; 201 if (diff <= 0) 202 return (0); 203 if (diff < n) 204 n = diff; 205 size = blksize(fcmp, ip, lbn); 206 rablock = lbn + 1; 207 if (ip->i_dirent.attr & FILECORE_ATTR_DIR) { 208 error = filecore_dbread(ip, &bp); 209 on = uio->uio_offset; 210 n = MIN(FILECORE_DIR_SIZE - on, uio->uio_resid); 211 size = FILECORE_DIR_SIZE; 212 } else { 213 error = bread(vp, lbn, size, NOCRED, &bp); 214 #ifdef FILECORE_DEBUG_BR 215 printf("bread(%p, %x, %ld, CRED, %p)=%d\n", 216 vp, lbn, size, bp, error); 217 #endif 218 } 219 n = MIN(n, size - bp->b_resid); 220 if (error) { 221 #ifdef FILECORE_DEBUG_BR 222 printf("brelse(%p) vn1\n", bp); 223 #endif 224 brelse(bp); 225 return (error); 226 } 227 228 error = uiomove(bp->b_data + on, (int)n, uio); 229 #ifdef FILECORE_DEBUG_BR 230 printf("brelse(%p) vn2\n", bp); 231 #endif 232 brelse(bp); 233 } while (error == 0 && uio->uio_resid > 0 && n != 0); 234 235 out: 236 return (error); 237 } 238 239 /* 240 * Vnode op for readdir 241 */ 242 int 243 filecore_readdir(v) 244 void *v; 245 { 246 struct vop_readdir_args /* { 247 struct vnode *a_vp; 248 struct uio *a_uio; 249 struct ucred *a_cred; 250 int *a_eofflag; 251 off_t **a_cookies; 252 int *a_ncookies; 253 } */ *ap = v; 254 struct uio *uio = ap->a_uio; 255 struct vnode *vdp = ap->a_vp; 256 struct filecore_node *dp; 257 struct filecore_mnt *fcmp; 258 struct buf *bp = NULL; 259 struct dirent de; 260 struct filecore_direntry *dep = NULL; 261 int error = 0; 262 off_t *cookies = NULL; 263 int ncookies = 0; 264 int i; 265 off_t uiooff; 266 267 dp = VTOI(vdp); 268 269 if ((dp->i_dirent.attr & FILECORE_ATTR_DIR) == 0) 270 return (ENOTDIR); 271 272 if (uio->uio_offset % FILECORE_DIRENT_SIZE != 0) 273 return (EINVAL); 274 i = uio->uio_offset / FILECORE_DIRENT_SIZE; 275 uiooff = uio->uio_offset; 276 277 *ap->a_eofflag = 0; 278 fcmp = dp->i_mnt; 279 280 error = filecore_dbread(dp, &bp); 281 if (error) { 282 brelse(bp); 283 return error; 284 } 285 286 if (ap->a_ncookies == NULL) 287 cookies = NULL; 288 else { 289 *ap->a_ncookies = 0; 290 ncookies = uio->uio_resid/16; 291 cookies = malloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); 292 } 293 294 for (; ; i++) { 295 switch (i) { 296 case 0: 297 /* Fake the '.' entry */ 298 de.d_fileno = dp->i_number; 299 de.d_type = DT_DIR; 300 de.d_namlen = 1; 301 strlcpy(de.d_name, ".", sizeof(de.d_name)); 302 break; 303 case 1: 304 /* Fake the '..' entry */ 305 de.d_fileno = filecore_getparent(dp); 306 de.d_type = DT_DIR; 307 de.d_namlen = 2; 308 strlcpy(de.d_name, "..", sizeof(de.d_name)); 309 break; 310 default: 311 de.d_fileno = dp->i_dirent.addr + 312 ((i - 2) << FILECORE_INO_INDEX); 313 dep = fcdirentry(bp->b_data, i - 2); 314 if (dep->attr & FILECORE_ATTR_DIR) 315 de.d_type = DT_DIR; 316 else 317 de.d_type = DT_REG; 318 if (filecore_fn2unix(dep->name, de.d_name, 319 &de.d_namlen)) { 320 *ap->a_eofflag = 1; 321 goto out; 322 } 323 break; 324 } 325 de.d_reclen = DIRENT_SIZE(&de); 326 if (uio->uio_resid < de.d_reclen) 327 goto out; 328 error = uiomove((caddr_t) &de, de.d_reclen, uio); 329 if (error) 330 goto out; 331 uiooff += FILECORE_DIRENT_SIZE; 332 333 if (cookies) { 334 *cookies++ = i*FILECORE_DIRENT_SIZE; 335 (*ap->a_ncookies)++; 336 if (--ncookies == 0) goto out; 337 } 338 } 339 out: 340 if (cookies) { 341 *ap->a_cookies = cookies; 342 if (error) { 343 free(cookies, M_TEMP); 344 *ap->a_ncookies = 0; 345 *ap->a_cookies = NULL; 346 } 347 } 348 uio->uio_offset = uiooff; 349 350 #ifdef FILECORE_DEBUG_BR 351 printf("brelse(%p) vn3\n", bp); 352 #endif 353 brelse (bp); 354 355 return (error); 356 } 357 358 /* 359 * Return target name of a symbolic link 360 * Shouldn't we get the parent vnode and read the data from there? 361 * This could eventually result in deadlocks in filecore_lookup. 362 * But otherwise the block read here is in the block buffer two times. 363 */ 364 int 365 filecore_readlink(v) 366 void *v; 367 { 368 #if 0 369 struct vop_readlink_args /* { 370 struct vnode *a_vp; 371 struct uio *a_uio; 372 struct ucred *a_cred; 373 } */ *ap = v; 374 #endif 375 376 return (EINVAL); 377 } 378 379 int 380 filecore_link(v) 381 void *v; 382 { 383 struct vop_link_args /* { 384 struct vnode *a_dvp; 385 struct vnode *a_vp; 386 struct componentname *a_cnp; 387 } */ *ap = v; 388 389 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 390 vput(ap->a_dvp); 391 return (EROFS); 392 } 393 394 int 395 filecore_symlink(v) 396 void *v; 397 { 398 struct vop_symlink_args /* { 399 struct vnode *a_dvp; 400 struct vnode **a_vpp; 401 struct componentname *a_cnp; 402 struct vattr *a_vap; 403 char *a_target; 404 } */ *ap = v; 405 406 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 407 vput(ap->a_dvp); 408 return (EROFS); 409 } 410 411 /* 412 * Calculate the logical to physical mapping if not done already, 413 * then call the device strategy routine. 414 */ 415 int 416 filecore_strategy(v) 417 void *v; 418 { 419 struct vop_strategy_args /* { 420 struct buf *a_bp; 421 } */ *ap = v; 422 struct buf *bp = ap->a_bp; 423 struct vnode *vp = bp->b_vp; 424 struct filecore_node *ip; 425 int error; 426 427 ip = VTOI(vp); 428 if (bp->b_blkno == bp->b_lblkno) { 429 error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL); 430 if (error) { 431 bp->b_error = error; 432 bp->b_flags |= B_ERROR; 433 biodone(bp); 434 return (error); 435 } 436 if ((long)bp->b_blkno == -1) 437 clrbuf(bp); 438 } 439 if ((long)bp->b_blkno == -1) { 440 biodone(bp); 441 return (0); 442 } 443 vp = ip->i_devvp; 444 bp->b_dev = vp->v_rdev; 445 VOCALL (vp->v_op, VOFFSET(vop_strategy), ap); 446 return (0); 447 } 448 449 /* 450 * Print out the contents of an inode. 451 */ 452 /*ARGSUSED*/ 453 int 454 filecore_print(v) 455 void *v; 456 { 457 458 printf("tag VT_FILECORE, filecore vnode\n"); 459 return (0); 460 } 461 462 /* 463 * Return POSIX pathconf information applicable to filecore filesystems. 464 */ 465 int 466 filecore_pathconf(v) 467 void *v; 468 { 469 struct vop_pathconf_args /* { 470 struct vnode *a_vp; 471 int a_name; 472 register_t *a_retval; 473 } */ *ap = v; 474 switch (ap->a_name) { 475 case _PC_LINK_MAX: 476 *ap->a_retval = 1; 477 return (0); 478 case _PC_NAME_MAX: 479 *ap->a_retval = 10; 480 return (0); 481 case _PC_PATH_MAX: 482 *ap->a_retval = 256; 483 return (0); 484 case _PC_CHOWN_RESTRICTED: 485 *ap->a_retval = 1; 486 return (0); 487 case _PC_NO_TRUNC: 488 *ap->a_retval = 1; 489 return (0); 490 case _PC_SYNC_IO: 491 *ap->a_retval = 1; 492 return (0); 493 case _PC_FILESIZEBITS: 494 *ap->a_retval = 32; 495 return (0); 496 default: 497 return (EINVAL); 498 } 499 /* NOTREACHED */ 500 } 501 502 /* 503 * Global vfs data structures for isofs 504 */ 505 #define filecore_create genfs_eopnotsupp 506 #define filecore_mknod genfs_eopnotsupp 507 #define filecore_write genfs_eopnotsupp 508 #define filecore_setattr genfs_eopnotsupp 509 #ifdef NFSSERVER 510 int lease_check __P((void *)); 511 #define filecore_lease_check lease_check 512 #else 513 #define filecore_lease_check genfs_nullop 514 #endif 515 #define filecore_fcntl genfs_fcntl 516 #define filecore_ioctl genfs_enoioctl 517 #define filecore_fsync genfs_nullop 518 #define filecore_remove genfs_eopnotsupp 519 #define filecore_rename genfs_eopnotsupp 520 #define filecore_mkdir genfs_eopnotsupp 521 #define filecore_rmdir genfs_eopnotsupp 522 #define filecore_advlock genfs_eopnotsupp 523 #define filecore_valloc genfs_eopnotsupp 524 #define filecore_vfree genfs_nullop 525 #define filecore_truncate genfs_eopnotsupp 526 #define filecore_update genfs_nullop 527 #define filecore_bwrite genfs_eopnotsupp 528 #define filecore_revoke genfs_revoke 529 #define filecore_blkatoff genfs_eopnotsupp 530 531 /* 532 * Global vfs data structures for filecore 533 */ 534 int (**filecore_vnodeop_p) __P((void *)); 535 const struct vnodeopv_entry_desc filecore_vnodeop_entries[] = { 536 { &vop_default_desc, vn_default_error }, 537 { &vop_lookup_desc, filecore_lookup }, /* lookup */ 538 { &vop_create_desc, filecore_create }, /* create */ 539 { &vop_mknod_desc, filecore_mknod }, /* mknod */ 540 { &vop_open_desc, filecore_open }, /* open */ 541 { &vop_close_desc, filecore_close }, /* close */ 542 { &vop_access_desc, filecore_access }, /* access */ 543 { &vop_getattr_desc, filecore_getattr }, /* getattr */ 544 { &vop_setattr_desc, filecore_setattr }, /* setattr */ 545 { &vop_read_desc, filecore_read }, /* read */ 546 { &vop_write_desc, filecore_write }, /* write */ 547 { &vop_lease_desc, filecore_lease_check }, /* lease */ 548 { &vop_fcntl_desc, filecore_fcntl }, /* fcntl */ 549 { &vop_ioctl_desc, filecore_ioctl }, /* ioctl */ 550 { &vop_poll_desc, filecore_poll }, /* poll */ 551 { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ 552 { &vop_revoke_desc, filecore_revoke }, /* revoke */ 553 { &vop_mmap_desc, filecore_mmap }, /* mmap */ 554 { &vop_fsync_desc, filecore_fsync }, /* fsync */ 555 { &vop_seek_desc, filecore_seek }, /* seek */ 556 { &vop_remove_desc, filecore_remove }, /* remove */ 557 { &vop_link_desc, filecore_link }, /* link */ 558 { &vop_rename_desc, filecore_rename }, /* rename */ 559 { &vop_mkdir_desc, filecore_mkdir }, /* mkdir */ 560 { &vop_rmdir_desc, filecore_rmdir }, /* rmdir */ 561 { &vop_symlink_desc, filecore_symlink }, /* symlink */ 562 { &vop_readdir_desc, filecore_readdir }, /* readdir */ 563 { &vop_readlink_desc, filecore_readlink }, /* readlink */ 564 { &vop_abortop_desc, filecore_abortop }, /* abortop */ 565 { &vop_inactive_desc, filecore_inactive }, /* inactive */ 566 { &vop_reclaim_desc, filecore_reclaim }, /* reclaim */ 567 { &vop_lock_desc, genfs_lock }, /* lock */ 568 { &vop_unlock_desc, genfs_unlock }, /* unlock */ 569 { &vop_bmap_desc, filecore_bmap }, /* bmap */ 570 { &vop_strategy_desc, filecore_strategy }, /* strategy */ 571 { &vop_print_desc, filecore_print }, /* print */ 572 { &vop_islocked_desc, genfs_islocked }, /* islocked */ 573 { &vop_pathconf_desc, filecore_pathconf }, /* pathconf */ 574 { &vop_advlock_desc, filecore_advlock }, /* advlock */ 575 { &vop_blkatoff_desc, filecore_blkatoff }, /* blkatoff */ 576 { &vop_valloc_desc, filecore_valloc }, /* valloc */ 577 { &vop_vfree_desc, filecore_vfree }, /* vfree */ 578 { &vop_truncate_desc, filecore_truncate }, /* truncate */ 579 { &vop_update_desc, filecore_update }, /* update */ 580 { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ 581 { &vop_getpages_desc, genfs_getpages }, /* getpages */ 582 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 583 { NULL, NULL } 584 }; 585 const struct vnodeopv_desc filecore_vnodeop_opv_desc = 586 { &filecore_vnodeop_p, filecore_vnodeop_entries }; 587
Indexes created Wed Oct 15 03:09:54 GMT 2025