coda_vnops.c revision 1.58
1 /* $NetBSD: coda_vnops.c,v 1.58 2007/04/15 12:45:39 gdt Exp $ */ 2 3 /* 4 * 5 * Coda: an Experimental Distributed File System 6 * Release 3.1 7 * 8 * Copyright (c) 1987-1998 Carnegie Mellon University 9 * All Rights Reserved 10 * 11 * Permission to use, copy, modify and distribute this software and its 12 * documentation is hereby granted, provided that both the copyright 13 * notice and this permission notice appear in all copies of the 14 * software, derivative works or modified versions, and any portions 15 * thereof, and that both notices appear in supporting documentation, and 16 * that credit is given to Carnegie Mellon University in all documents 17 * and publicity pertaining to direct or indirect use of this code or its 18 * derivatives. 19 * 20 * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS, 21 * SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS 22 * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON 23 * DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER 24 * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF 25 * ANY DERIVATIVE WORK. 26 * 27 * Carnegie Mellon encourages users of this software to return any 28 * improvements or extensions that they make, and to grant Carnegie 29 * Mellon the rights to redistribute these changes without encumbrance. 30 * 31 * @(#) coda/coda_vnops.c,v 1.1.1.1 1998/08/29 21:26:46 rvb Exp $ 32 */ 33 34 /* 35 * Mach Operating System 36 * Copyright (c) 1990 Carnegie-Mellon University 37 * Copyright (c) 1989 Carnegie-Mellon University 38 * All rights reserved. The CMU software License Agreement specifies 39 * the terms and conditions for use and redistribution. 40 */ 41 42 /* 43 * This code was written for the Coda file system at Carnegie Mellon 44 * University. Contributers include David Steere, James Kistler, and 45 * M. Satyanarayanan. 46 */ 47 48 #include <sys/cdefs.h> 49 __KERNEL_RCSID(0, "$NetBSD: coda_vnops.c,v 1.58 2007/04/15 12:45:39 gdt Exp $"); 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/malloc.h> 54 #include <sys/errno.h> 55 #include <sys/acct.h> 56 #include <sys/file.h> 57 #include <sys/uio.h> 58 #include <sys/namei.h> 59 #include <sys/ioctl.h> 60 #include <sys/mount.h> 61 #include <sys/proc.h> 62 #include <sys/select.h> 63 #include <sys/user.h> 64 #include <sys/kauth.h> 65 66 #include <miscfs/genfs/genfs.h> 67 68 #include <coda/coda.h> 69 #include <coda/cnode.h> 70 #include <coda/coda_vnops.h> 71 #include <coda/coda_venus.h> 72 #include <coda/coda_opstats.h> 73 #include <coda/coda_subr.h> 74 #include <coda/coda_namecache.h> 75 #include <coda/coda_pioctl.h> 76 77 /* 78 * These flags select various performance enhancements. 79 */ 80 int coda_attr_cache = 1; /* Set to cache attributes in the kernel */ 81 int coda_symlink_cache = 1; /* Set to cache symbolic link information */ 82 int coda_access_cache = 1; /* Set to handle some access checks directly */ 83 84 /* structure to keep track of vfs calls */ 85 86 struct coda_op_stats coda_vnodeopstats[CODA_VNODEOPS_SIZE]; 87 88 #define MARK_ENTRY(op) (coda_vnodeopstats[op].entries++) 89 #define MARK_INT_SAT(op) (coda_vnodeopstats[op].sat_intrn++) 90 #define MARK_INT_FAIL(op) (coda_vnodeopstats[op].unsat_intrn++) 91 #define MARK_INT_GEN(op) (coda_vnodeopstats[op].gen_intrn++) 92 93 /* What we are delaying for in printf */ 94 int coda_printf_delay = 0; /* in microseconds */ 95 int coda_vnop_print_entry = 0; 96 static int coda_lockdebug = 0; 97 98 #define ENTRY if(coda_vnop_print_entry) myprintf(("Entered %s\n",__func__)) 99 100 /* Definition of the vnode operation vector */ 101 102 const struct vnodeopv_entry_desc coda_vnodeop_entries[] = { 103 { &vop_default_desc, coda_vop_error }, 104 { &vop_lookup_desc, coda_lookup }, /* lookup */ 105 { &vop_create_desc, coda_create }, /* create */ 106 { &vop_mknod_desc, coda_vop_error }, /* mknod */ 107 { &vop_open_desc, coda_open }, /* open */ 108 { &vop_close_desc, coda_close }, /* close */ 109 { &vop_access_desc, coda_access }, /* access */ 110 { &vop_getattr_desc, coda_getattr }, /* getattr */ 111 { &vop_setattr_desc, coda_setattr }, /* setattr */ 112 { &vop_read_desc, coda_read }, /* read */ 113 { &vop_write_desc, coda_write }, /* write */ 114 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 115 { &vop_ioctl_desc, coda_ioctl }, /* ioctl */ 116 { &vop_mmap_desc, genfs_mmap }, /* mmap */ 117 { &vop_fsync_desc, coda_fsync }, /* fsync */ 118 { &vop_remove_desc, coda_remove }, /* remove */ 119 { &vop_link_desc, coda_link }, /* link */ 120 { &vop_rename_desc, coda_rename }, /* rename */ 121 { &vop_mkdir_desc, coda_mkdir }, /* mkdir */ 122 { &vop_rmdir_desc, coda_rmdir }, /* rmdir */ 123 { &vop_symlink_desc, coda_symlink }, /* symlink */ 124 { &vop_readdir_desc, coda_readdir }, /* readdir */ 125 { &vop_readlink_desc, coda_readlink }, /* readlink */ 126 { &vop_abortop_desc, coda_abortop }, /* abortop */ 127 { &vop_inactive_desc, coda_inactive }, /* inactive */ 128 { &vop_reclaim_desc, coda_reclaim }, /* reclaim */ 129 { &vop_lock_desc, coda_lock }, /* lock */ 130 { &vop_unlock_desc, coda_unlock }, /* unlock */ 131 { &vop_bmap_desc, coda_bmap }, /* bmap */ 132 { &vop_strategy_desc, coda_strategy }, /* strategy */ 133 { &vop_print_desc, coda_vop_error }, /* print */ 134 { &vop_islocked_desc, coda_islocked }, /* islocked */ 135 { &vop_pathconf_desc, coda_vop_error }, /* pathconf */ 136 { &vop_advlock_desc, coda_vop_nop }, /* advlock */ 137 { &vop_bwrite_desc, coda_vop_error }, /* bwrite */ 138 { &vop_lease_desc, coda_vop_nop }, /* lease */ 139 { &vop_seek_desc, genfs_seek }, /* seek */ 140 { &vop_poll_desc, genfs_poll }, /* poll */ 141 { &vop_getpages_desc, coda_getpages }, /* getpages */ 142 { &vop_putpages_desc, coda_putpages }, /* putpages */ 143 { NULL, NULL } 144 }; 145 146 const struct vnodeopv_desc coda_vnodeop_opv_desc = 147 { &coda_vnodeop_p, coda_vnodeop_entries }; 148 149 /* Definitions of NetBSD vnodeop interfaces */ 150 151 /* 152 * A generic error routine. Return EIO without looking at arguments. 153 */ 154 int 155 coda_vop_error(void *anon) { 156 struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; 157 158 if (codadebug) { 159 myprintf(("coda_vop_error: Vnode operation %s called (error).\n", 160 (*desc)->vdesc_name)); 161 } 162 163 return EIO; 164 } 165 166 /* A generic do-nothing. For lease_check, advlock */ 167 int 168 coda_vop_nop(void *anon) { 169 struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; 170 171 if (codadebug) { 172 myprintf(("Vnode operation %s called, but unsupported\n", 173 (*desc)->vdesc_name)); 174 } 175 return (0); 176 } 177 178 int 179 coda_vnodeopstats_init(void) 180 { 181 int i; 182 183 for(i=0;i<CODA_VNODEOPS_SIZE;i++) { 184 coda_vnodeopstats[i].opcode = i; 185 coda_vnodeopstats[i].entries = 0; 186 coda_vnodeopstats[i].sat_intrn = 0; 187 coda_vnodeopstats[i].unsat_intrn = 0; 188 coda_vnodeopstats[i].gen_intrn = 0; 189 } 190 191 return 0; 192 } 193 194 /* 195 * XXX The entire relationship between VOP_OPEN and having a container 196 * file (via venus_open) needs to be reexamined. In particular, it's 197 * valid to open/mmap/close and then reference. Instead of doing 198 * VOP_OPEN when getpages needs a container, we should do the 199 * venus_open part, and record that the vnode has opened the container 200 * for getpages, and do the matching logical close on coda_inactive. 201 * Further, coda_rdwr needs a container file, and sometimes needs to 202 * do the equivalent of open (core dumps). 203 */ 204 /* 205 * coda_open calls Venus to return the device and inode of the 206 * container file, and then obtains a vnode for that file. The 207 * container vnode is stored in the coda vnode, and a reference is 208 * added for each open file. 209 */ 210 int 211 coda_open(void *v) 212 { 213 /* 214 * NetBSD can pass the O_EXCL flag in mode, even though the check 215 * has already happened. Venus defensively assumes that if open 216 * is passed the EXCL, it must be a bug. We strip the flag here. 217 */ 218 /* true args */ 219 struct vop_open_args *ap = v; 220 struct vnode *vp = ap->a_vp; 221 struct cnode *cp = VTOC(vp); 222 int flag = ap->a_mode & (~O_EXCL); 223 kauth_cred_t cred = ap->a_cred; 224 struct lwp *l = ap->a_l; 225 /* locals */ 226 int error; 227 dev_t dev; /* container file device, inode, vnode */ 228 ino_t inode; 229 struct vnode *container_vp; 230 231 MARK_ENTRY(CODA_OPEN_STATS); 232 233 /* Check for open of control file. */ 234 if (IS_CTL_VP(vp)) { 235 /* if (WRITABLE(flag)) */ 236 if (flag & (FWRITE | O_TRUNC | O_CREAT | O_EXCL)) { 237 MARK_INT_FAIL(CODA_OPEN_STATS); 238 return(EACCES); 239 } 240 MARK_INT_SAT(CODA_OPEN_STATS); 241 return(0); 242 } 243 244 error = venus_open(vtomi(vp), &cp->c_fid, flag, cred, l, &dev, &inode); 245 if (error) 246 return (error); 247 if (!error) { 248 CODADEBUG( CODA_OPEN,myprintf(("open: dev %d inode %llu result %d\n", 249 dev, (unsigned long long)inode, error)); ) 250 } 251 252 /* 253 * Obtain locked and referenced container vnode from container 254 * device/inode. 255 */ 256 error = coda_grab_vnode(dev, inode, &container_vp); 257 if (error) 258 return (error); 259 260 /* 261 * Keep a reference to the coda vnode until the close comes in. 262 * XXX This does not make sense. Try without. 263 */ 264 vref(vp); 265 266 /* Save the vnode pointer for the container file. */ 267 if (cp->c_ovp == NULL) { 268 cp->c_ovp = container_vp; 269 } else { 270 if (cp->c_ovp != container_vp) 271 /* 272 * Perhaps venus returned a different container, or 273 * something else went wrong. 274 */ 275 panic("coda_open: cp->c_ovp != container_vp"); 276 } 277 cp->c_ocount++; 278 279 /* Flush the attribute cache if writing the file. */ 280 if (flag & FWRITE) { 281 cp->c_owrite++; 282 cp->c_flags &= ~C_VATTR; 283 } 284 285 /* Save the <device, inode> pair for the cache file to speed 286 up subsequent page_read's. */ 287 cp->c_device = dev; 288 cp->c_inode = inode; 289 290 /* Open the cache file. */ 291 error = VOP_OPEN(container_vp, flag, cred, l); 292 /* 293 * Drop the lock on the container, after we have done VOP_OPEN 294 * (which requires a locked vnode). 295 */ 296 VOP_UNLOCK(container_vp, 0); 297 return(error); 298 } 299 300 /* 301 * Close the cache file used for I/O and notify Venus. 302 */ 303 int 304 coda_close(void *v) 305 { 306 /* true args */ 307 struct vop_close_args *ap = v; 308 struct vnode *vp = ap->a_vp; 309 struct cnode *cp = VTOC(vp); 310 int flag = ap->a_fflag; 311 kauth_cred_t cred = ap->a_cred; 312 struct lwp *l = ap->a_l; 313 /* locals */ 314 int error; 315 316 MARK_ENTRY(CODA_CLOSE_STATS); 317 318 /* Check for close of control file. */ 319 if (IS_CTL_VP(vp)) { 320 MARK_INT_SAT(CODA_CLOSE_STATS); 321 return(0); 322 } 323 324 /* 325 * XXX The IS_UNMOUNTING part of this is very suspect. 326 */ 327 if (IS_UNMOUNTING(cp)) { 328 if (cp->c_ovp) { 329 #ifdef CODA_VERBOSE 330 printf("coda_close: destroying container ref %d, ufs vp %p of vp %p/cp %p\n", 331 vp->v_usecount, cp->c_ovp, vp, cp); 332 #endif 333 #ifdef hmm 334 vgone(cp->c_ovp); 335 #else 336 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 337 VOP_CLOSE(cp->c_ovp, flag, cred, l); /* Do errors matter here? */ 338 vput(cp->c_ovp); 339 #endif 340 } else { 341 #ifdef CODA_VERBOSE 342 printf("coda_close: NO container vp %p/cp %p\n", vp, cp); 343 #endif 344 } 345 return ENODEV; 346 } 347 348 /* Lock the container node, and VOP_CLOSE it. */ 349 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 350 VOP_CLOSE(cp->c_ovp, flag, cred, l); /* Do errors matter here? */ 351 /* 352 * Drop the lock we just obtained, and vrele the container vnode. 353 * Decrement reference counts, and clear container vnode pointer on 354 * last close. 355 */ 356 vput(cp->c_ovp); 357 if (flag & FWRITE) 358 --cp->c_owrite; 359 if (--cp->c_ocount == 0) 360 cp->c_ovp = NULL; 361 362 error = venus_close(vtomi(vp), &cp->c_fid, flag, cred, l); 363 364 /* Release reference to coda vnode taken during open. */ 365 vrele(CTOV(cp)); 366 367 CODADEBUG(CODA_CLOSE, myprintf(("close: result %d\n",error)); ) 368 return(error); 369 } 370 371 int 372 coda_read(void *v) 373 { 374 struct vop_read_args *ap = v; 375 376 ENTRY; 377 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_READ, 378 ap->a_ioflag, ap->a_cred, curlwp)); 379 } 380 381 int 382 coda_write(void *v) 383 { 384 struct vop_write_args *ap = v; 385 386 ENTRY; 387 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_WRITE, 388 ap->a_ioflag, ap->a_cred, curlwp)); 389 } 390 391 int 392 coda_rdwr(struct vnode *vp, struct uio *uiop, enum uio_rw rw, int ioflag, 393 kauth_cred_t cred, struct lwp *l) 394 { 395 /* upcall decl */ 396 /* NOTE: container file operation!!! */ 397 /* locals */ 398 struct cnode *cp = VTOC(vp); 399 struct vnode *cfvp = cp->c_ovp; 400 struct proc *p = l->l_proc; 401 int opened_internally = 0; 402 int error = 0; 403 404 MARK_ENTRY(CODA_RDWR_STATS); 405 406 CODADEBUG(CODA_RDWR, myprintf(("coda_rdwr(%d, %p, %lu, %lld)\n", rw, 407 uiop->uio_iov->iov_base, 408 (unsigned long) uiop->uio_resid, 409 (long long) uiop->uio_offset)); ) 410 411 /* Check for rdwr of control object. */ 412 if (IS_CTL_VP(vp)) { 413 MARK_INT_FAIL(CODA_RDWR_STATS); 414 return(EINVAL); 415 } 416 417 /* Redirect the request to UFS. */ 418 419 /* 420 * If file is not already open this must be a page 421 * {read,write} request. Iget the cache file's inode 422 * pointer if we still have its <device, inode> pair. 423 * Otherwise, we must do an internal open to derive the 424 * pair. 425 * XXX Integrate this into a coherent strategy for container 426 * file acquisition. 427 */ 428 if (cfvp == NULL) { 429 /* 430 * If we're dumping core, do the internal open. Otherwise 431 * venus won't have the correct size of the core when 432 * it's completely written. 433 */ 434 if (cp->c_inode != 0 && !(p && (p->p_acflag & ACORE))) { 435 printf("coda_rdwr: grabbing container vnode, losing reference\n"); 436 /* Get locked and refed vnode. */ 437 error = coda_grab_vnode(cp->c_device, cp->c_inode, &cfvp); 438 if (error) { 439 MARK_INT_FAIL(CODA_RDWR_STATS); 440 return(error); 441 } 442 /* 443 * Drop lock. 444 * XXX Where is reference released. 445 */ 446 VOP_UNLOCK(cfvp, 0); 447 } 448 else { 449 printf("coda_rdwr: internal VOP_OPEN\n"); 450 opened_internally = 1; 451 MARK_INT_GEN(CODA_OPEN_STATS); 452 error = VOP_OPEN(vp, (rw == UIO_READ ? FREAD : FWRITE), 453 cred, l); 454 #ifdef CODA_VERBOSE 455 printf("coda_rdwr: Internally Opening %p\n", vp); 456 #endif 457 if (error) { 458 MARK_INT_FAIL(CODA_RDWR_STATS); 459 return(error); 460 } 461 cfvp = cp->c_ovp; 462 } 463 } 464 465 /* Have UFS handle the call. */ 466 CODADEBUG(CODA_RDWR, myprintf(("indirect rdwr: fid = %s, refcnt = %d\n", 467 coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount)); ) 468 469 if (rw == UIO_READ) { 470 error = VOP_READ(cfvp, uiop, ioflag, cred); 471 } else { 472 error = VOP_WRITE(cfvp, uiop, ioflag, cred); 473 } 474 475 if (error) 476 MARK_INT_FAIL(CODA_RDWR_STATS); 477 else 478 MARK_INT_SAT(CODA_RDWR_STATS); 479 480 /* Do an internal close if necessary. */ 481 if (opened_internally) { 482 MARK_INT_GEN(CODA_CLOSE_STATS); 483 (void)VOP_CLOSE(vp, (rw == UIO_READ ? FREAD : FWRITE), cred, l); 484 } 485 486 /* Invalidate cached attributes if writing. */ 487 if (rw == UIO_WRITE) 488 cp->c_flags &= ~C_VATTR; 489 return(error); 490 } 491 492 int 493 coda_ioctl(void *v) 494 { 495 /* true args */ 496 struct vop_ioctl_args *ap = v; 497 struct vnode *vp = ap->a_vp; 498 int com = ap->a_command; 499 void *data = ap->a_data; 500 int flag = ap->a_fflag; 501 kauth_cred_t cred = ap->a_cred; 502 struct lwp *l = ap->a_l; 503 /* locals */ 504 int error; 505 struct vnode *tvp; 506 struct nameidata ndp; 507 struct PioctlData *iap = (struct PioctlData *)data; 508 509 MARK_ENTRY(CODA_IOCTL_STATS); 510 511 CODADEBUG(CODA_IOCTL, myprintf(("in coda_ioctl on %s\n", iap->path));) 512 513 /* Don't check for operation on a dying object, for ctlvp it 514 shouldn't matter */ 515 516 /* Must be control object to succeed. */ 517 if (!IS_CTL_VP(vp)) { 518 MARK_INT_FAIL(CODA_IOCTL_STATS); 519 CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: vp != ctlvp"));) 520 return (EOPNOTSUPP); 521 } 522 /* Look up the pathname. */ 523 524 /* Should we use the name cache here? It would get it from 525 lookupname sooner or later anyway, right? */ 526 527 NDINIT(&ndp, LOOKUP, (iap->follow ? FOLLOW : NOFOLLOW), UIO_USERSPACE, 528 iap->path, l); 529 error = namei(&ndp); 530 tvp = ndp.ni_vp; 531 532 if (error) { 533 MARK_INT_FAIL(CODA_IOCTL_STATS); 534 CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: lookup returns %d\n", 535 error));) 536 return(error); 537 } 538 539 /* 540 * Make sure this is a coda style cnode, but it may be a 541 * different vfsp 542 */ 543 /* XXX: this totally violates the comment about vtagtype in vnode.h */ 544 if (tvp->v_tag != VT_CODA) { 545 vrele(tvp); 546 MARK_INT_FAIL(CODA_IOCTL_STATS); 547 CODADEBUG(CODA_IOCTL, 548 myprintf(("coda_ioctl error: %s not a coda object\n", 549 iap->path));) 550 return(EINVAL); 551 } 552 553 if (iap->vi.in_size > VC_MAXDATASIZE) { 554 vrele(tvp); 555 return(EINVAL); 556 } 557 error = venus_ioctl(vtomi(tvp), &((VTOC(tvp))->c_fid), com, flag, data, cred, l); 558 559 if (error) 560 MARK_INT_FAIL(CODA_IOCTL_STATS); 561 else 562 CODADEBUG(CODA_IOCTL, myprintf(("Ioctl returns %d \n", error)); ) 563 564 vrele(tvp); 565 return(error); 566 } 567 568 /* 569 * To reduce the cost of a user-level venus;we cache attributes in 570 * the kernel. Each cnode has storage allocated for an attribute. If 571 * c_vattr is valid, return a reference to it. Otherwise, get the 572 * attributes from venus and store them in the cnode. There is some 573 * question if this method is a security leak. But I think that in 574 * order to make this call, the user must have done a lookup and 575 * opened the file, and therefore should already have access. 576 */ 577 int 578 coda_getattr(void *v) 579 { 580 /* true args */ 581 struct vop_getattr_args *ap = v; 582 struct vnode *vp = ap->a_vp; 583 struct cnode *cp = VTOC(vp); 584 struct vattr *vap = ap->a_vap; 585 kauth_cred_t cred = ap->a_cred; 586 struct lwp *l = ap->a_l; 587 /* locals */ 588 int error; 589 590 MARK_ENTRY(CODA_GETATTR_STATS); 591 592 /* Check for getattr of control object. */ 593 if (IS_CTL_VP(vp)) { 594 MARK_INT_FAIL(CODA_GETATTR_STATS); 595 return(ENOENT); 596 } 597 598 /* Check to see if the attributes have already been cached */ 599 if (VALID_VATTR(cp)) { 600 CODADEBUG(CODA_GETATTR, { myprintf(("attr cache hit: %s\n", 601 coda_f2s(&cp->c_fid)));}); 602 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 603 print_vattr(&cp->c_vattr); ); 604 605 *vap = cp->c_vattr; 606 MARK_INT_SAT(CODA_GETATTR_STATS); 607 return(0); 608 } 609 610 error = venus_getattr(vtomi(vp), &cp->c_fid, cred, l, vap); 611 612 if (!error) { 613 CODADEBUG(CODA_GETATTR, myprintf(("getattr miss %s: result %d\n", 614 coda_f2s(&cp->c_fid), error)); ) 615 616 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 617 print_vattr(vap); ); 618 619 /* If not open for write, store attributes in cnode */ 620 if ((cp->c_owrite == 0) && (coda_attr_cache)) { 621 cp->c_vattr = *vap; 622 cp->c_flags |= C_VATTR; 623 } 624 625 } 626 return(error); 627 } 628 629 int 630 coda_setattr(void *v) 631 { 632 /* true args */ 633 struct vop_setattr_args *ap = v; 634 struct vnode *vp = ap->a_vp; 635 struct cnode *cp = VTOC(vp); 636 struct vattr *vap = ap->a_vap; 637 kauth_cred_t cred = ap->a_cred; 638 struct lwp *l = ap->a_l; 639 /* locals */ 640 int error; 641 642 MARK_ENTRY(CODA_SETATTR_STATS); 643 644 /* Check for setattr of control object. */ 645 if (IS_CTL_VP(vp)) { 646 MARK_INT_FAIL(CODA_SETATTR_STATS); 647 return(ENOENT); 648 } 649 650 if (codadebug & CODADBGMSK(CODA_SETATTR)) { 651 print_vattr(vap); 652 } 653 error = venus_setattr(vtomi(vp), &cp->c_fid, vap, cred, l); 654 655 if (!error) 656 cp->c_flags &= ~C_VATTR; 657 658 CODADEBUG(CODA_SETATTR, myprintf(("setattr %d\n", error)); ) 659 return(error); 660 } 661 662 int 663 coda_access(void *v) 664 { 665 /* true args */ 666 struct vop_access_args *ap = v; 667 struct vnode *vp = ap->a_vp; 668 struct cnode *cp = VTOC(vp); 669 int mode = ap->a_mode; 670 kauth_cred_t cred = ap->a_cred; 671 struct lwp *l = ap->a_l; 672 /* locals */ 673 int error; 674 675 MARK_ENTRY(CODA_ACCESS_STATS); 676 677 /* Check for access of control object. Only read access is 678 allowed on it. */ 679 if (IS_CTL_VP(vp)) { 680 /* bogus hack - all will be marked as successes */ 681 MARK_INT_SAT(CODA_ACCESS_STATS); 682 return(((mode & VREAD) && !(mode & (VWRITE | VEXEC))) 683 ? 0 : EACCES); 684 } 685 686 /* 687 * if the file is a directory, and we are checking exec (eg lookup) 688 * access, and the file is in the namecache, then the user must have 689 * lookup access to it. 690 */ 691 if (coda_access_cache) { 692 if ((vp->v_type == VDIR) && (mode & VEXEC)) { 693 if (coda_nc_lookup(cp, ".", 1, cred)) { 694 MARK_INT_SAT(CODA_ACCESS_STATS); 695 return(0); /* it was in the cache */ 696 } 697 } 698 } 699 700 error = venus_access(vtomi(vp), &cp->c_fid, mode, cred, l); 701 702 return(error); 703 } 704 705 /* 706 * CODA abort op, called after namei() when a CREATE/DELETE isn't actually 707 * done. If a buffer has been saved in anticipation of a coda_create or 708 * a coda_remove, delete it. 709 */ 710 /* ARGSUSED */ 711 int 712 coda_abortop(void *v) 713 { 714 /* true args */ 715 struct vop_abortop_args /* { 716 struct vnode *a_dvp; 717 struct componentname *a_cnp; 718 } */ *ap = v; 719 /* upcall decl */ 720 /* locals */ 721 722 if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF) 723 PNBUF_PUT(ap->a_cnp->cn_pnbuf); 724 return (0); 725 } 726 727 int 728 coda_readlink(void *v) 729 { 730 /* true args */ 731 struct vop_readlink_args *ap = v; 732 struct vnode *vp = ap->a_vp; 733 struct cnode *cp = VTOC(vp); 734 struct uio *uiop = ap->a_uio; 735 kauth_cred_t cred = ap->a_cred; 736 /* locals */ 737 struct lwp *l = curlwp; 738 int error; 739 char *str; 740 int len; 741 742 MARK_ENTRY(CODA_READLINK_STATS); 743 744 /* Check for readlink of control object. */ 745 if (IS_CTL_VP(vp)) { 746 MARK_INT_FAIL(CODA_READLINK_STATS); 747 return(ENOENT); 748 } 749 750 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { /* symlink was cached */ 751 uiop->uio_rw = UIO_READ; 752 error = uiomove(cp->c_symlink, (int)cp->c_symlen, uiop); 753 if (error) 754 MARK_INT_FAIL(CODA_READLINK_STATS); 755 else 756 MARK_INT_SAT(CODA_READLINK_STATS); 757 return(error); 758 } 759 760 error = venus_readlink(vtomi(vp), &cp->c_fid, cred, l, &str, &len); 761 762 if (!error) { 763 uiop->uio_rw = UIO_READ; 764 error = uiomove(str, len, uiop); 765 766 if (coda_symlink_cache) { 767 cp->c_symlink = str; 768 cp->c_symlen = len; 769 cp->c_flags |= C_SYMLINK; 770 } else 771 CODA_FREE(str, len); 772 } 773 774 CODADEBUG(CODA_READLINK, myprintf(("in readlink result %d\n",error));) 775 return(error); 776 } 777 778 int 779 coda_fsync(void *v) 780 { 781 /* true args */ 782 struct vop_fsync_args *ap = v; 783 struct vnode *vp = ap->a_vp; 784 struct cnode *cp = VTOC(vp); 785 kauth_cred_t cred = ap->a_cred; 786 struct lwp *l = ap->a_l; 787 /* locals */ 788 struct vnode *convp = cp->c_ovp; 789 int error; 790 791 MARK_ENTRY(CODA_FSYNC_STATS); 792 793 /* Check for fsync on an unmounting object */ 794 /* The NetBSD kernel, in it's infinite wisdom, can try to fsync 795 * after an unmount has been initiated. This is a Bad Thing, 796 * which we have to avoid. Not a legitimate failure for stats. 797 */ 798 if (IS_UNMOUNTING(cp)) { 799 return(ENODEV); 800 } 801 802 /* Check for fsync of control object. */ 803 if (IS_CTL_VP(vp)) { 804 MARK_INT_SAT(CODA_FSYNC_STATS); 805 return(0); 806 } 807 808 if (convp) 809 VOP_FSYNC(convp, cred, MNT_WAIT, 0, 0, l); 810 811 /* 812 * We can expect fsync on any vnode at all if venus is pruging it. 813 * Venus can't very well answer the fsync request, now can it? 814 * Hopefully, it won't have to, because hopefully, venus preserves 815 * the (possibly untrue) invariant that it never purges an open 816 * vnode. Hopefully. 817 */ 818 if (cp->c_flags & C_PURGING) { 819 return(0); 820 } 821 822 error = venus_fsync(vtomi(vp), &cp->c_fid, cred, l); 823 824 CODADEBUG(CODA_FSYNC, myprintf(("in fsync result %d\n",error)); ); 825 return(error); 826 } 827 828 int 829 coda_inactive(void *v) 830 { 831 /* XXX - at the moment, inactive doesn't look at cred, and doesn't 832 have a proc pointer. Oops. */ 833 /* true args */ 834 struct vop_inactive_args *ap = v; 835 struct vnode *vp = ap->a_vp; 836 struct cnode *cp = VTOC(vp); 837 kauth_cred_t cred __attribute__((unused)) = NULL; 838 struct lwp *l __attribute__((unused)) = curlwp; 839 /* upcall decl */ 840 /* locals */ 841 842 /* We don't need to send inactive to venus - DCS */ 843 MARK_ENTRY(CODA_INACTIVE_STATS); 844 845 if (IS_CTL_VP(vp)) { 846 MARK_INT_SAT(CODA_INACTIVE_STATS); 847 return 0; 848 } 849 850 CODADEBUG(CODA_INACTIVE, myprintf(("in inactive, %s, vfsp %p\n", 851 coda_f2s(&cp->c_fid), vp->v_mount));) 852 853 /* If an array has been allocated to hold the symlink, deallocate it */ 854 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { 855 if (cp->c_symlink == NULL) 856 panic("coda_inactive: null symlink pointer in cnode"); 857 858 CODA_FREE(cp->c_symlink, cp->c_symlen); 859 cp->c_flags &= ~C_SYMLINK; 860 cp->c_symlen = 0; 861 } 862 863 /* Remove it from the table so it can't be found. */ 864 coda_unsave(cp); 865 if (vp->v_mount->mnt_data == NULL) { 866 myprintf(("Help! vfsp->vfs_data was NULL, but vnode %p wasn't dying\n", vp)); 867 panic("badness in coda_inactive"); 868 } 869 870 if (IS_UNMOUNTING(cp)) { 871 #ifdef DEBUG 872 printf("coda_inactive: IS_UNMOUNTING use %d: vp %p, cp %p\n", vp->v_usecount, vp, cp); 873 if (cp->c_ovp != NULL) 874 printf("coda_inactive: cp->ovp != NULL use %d: vp %p, cp %p\n", 875 vp->v_usecount, vp, cp); 876 #endif 877 lockmgr(&vp->v_lock, LK_RELEASE, &vp->v_interlock); 878 } else { 879 #ifdef OLD_DIAGNOSTIC 880 if (CTOV(cp)->v_usecount) { 881 panic("coda_inactive: nonzero reference count"); 882 } 883 if (cp->c_ovp != NULL) { 884 panic("coda_inactive: cp->ovp != NULL"); 885 } 886 #endif 887 VOP_UNLOCK(vp, 0); 888 vgone(vp); 889 } 890 891 MARK_INT_SAT(CODA_INACTIVE_STATS); 892 return(0); 893 } 894 895 /* 896 * Remote file system operations having to do with directory manipulation. 897 */ 898 899 /* 900 * It appears that in NetBSD, lookup is supposed to return the vnode locked 901 */ 902 int 903 coda_lookup(void *v) 904 { 905 /* true args */ 906 struct vop_lookup_args *ap = v; 907 /* (locked) vnode of dir in which to do lookup */ 908 struct vnode *dvp = ap->a_dvp; 909 struct cnode *dcp = VTOC(dvp); 910 /* output variable for result */ 911 struct vnode **vpp = ap->a_vpp; 912 /* name to lookup */ 913 struct componentname *cnp = ap->a_cnp; 914 kauth_cred_t cred = cnp->cn_cred; 915 struct lwp *l = cnp->cn_lwp; 916 /* locals */ 917 struct cnode *cp; 918 const char *nm = cnp->cn_nameptr; 919 int len = cnp->cn_namelen; 920 int flags = cnp->cn_flags; 921 int isdot; 922 CodaFid VFid; 923 int vtype; 924 int error = 0; 925 926 MARK_ENTRY(CODA_LOOKUP_STATS); 927 928 CODADEBUG(CODA_LOOKUP, myprintf(("lookup: %s in %s\n", 929 nm, coda_f2s(&dcp->c_fid)));); 930 931 /* 932 * XXX componentname flags in MODMASK are not handled at all 933 */ 934 935 /* 936 * The overall strategy is to switch on the lookup type and get a 937 * result vnode that is vref'd but not locked. Then, the code at 938 * exit: switches on ., .., and regular lookups and does the right 939 * locking. 940 */ 941 942 /* Check for lookup of control object. */ 943 if (IS_CTL_NAME(dvp, nm, len)) { 944 *vpp = coda_ctlvp; 945 vref(*vpp); 946 MARK_INT_SAT(CODA_LOOKUP_STATS); 947 goto exit; 948 } 949 950 /* Avoid trying to hand venus an unreasonably long name. */ 951 if (len+1 > CODA_MAXNAMLEN) { 952 MARK_INT_FAIL(CODA_LOOKUP_STATS); 953 CODADEBUG(CODA_LOOKUP, myprintf(("name too long: lookup, %s (%s)\n", 954 coda_f2s(&dcp->c_fid), nm));); 955 *vpp = (struct vnode *)0; 956 error = EINVAL; 957 goto exit; 958 } 959 960 /* 961 * XXX check for DOT lookups, and short circuit all the caches, 962 * just doing an extra vref. (venus guarantees that lookup of 963 * . returns self.) 964 */ 965 isdot = (len == 1 && nm[0] == '.'); 966 967 /* 968 * Try to resolve the lookup in the minicache. If that fails, ask 969 * venus to do the lookup. XXX The interaction between vnode 970 * locking and any locking that coda does is not clear. 971 */ 972 cp = coda_nc_lookup(dcp, nm, len, cred); 973 if (cp) { 974 *vpp = CTOV(cp); 975 vref(*vpp); 976 CODADEBUG(CODA_LOOKUP, 977 myprintf(("lookup result %d vpp %p\n",error,*vpp));) 978 } else { 979 /* The name wasn't cached, so ask Venus. */ 980 error = venus_lookup(vtomi(dvp), &dcp->c_fid, nm, len, cred, l, &VFid, &vtype); 981 982 if (error) { 983 MARK_INT_FAIL(CODA_LOOKUP_STATS); 984 CODADEBUG(CODA_LOOKUP, myprintf(("lookup error on %s (%s)%d\n", 985 coda_f2s(&dcp->c_fid), nm, error));) 986 *vpp = (struct vnode *)0; 987 } else { 988 MARK_INT_SAT(CODA_LOOKUP_STATS); 989 CODADEBUG(CODA_LOOKUP, 990 myprintf(("lookup: %s type %o result %d\n", 991 coda_f2s(&VFid), vtype, error)); ) 992 993 cp = make_coda_node(&VFid, dvp->v_mount, vtype); 994 *vpp = CTOV(cp); 995 /* vpp is now vrefed. */ 996 997 /* 998 * Unless this vnode is marked CODA_NOCACHE, enter it into 999 * the coda name cache to avoid a future venus round-trip. 1000 * XXX Interaction with componentname NOCACHE is unclear. 1001 */ 1002 if (!(vtype & CODA_NOCACHE)) 1003 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1004 } 1005 } 1006 1007 exit: 1008 /* 1009 * If we are creating, and this was the last name to be looked up, 1010 * and the error was ENOENT, then make the leaf NULL and return 1011 * success. 1012 * XXX Check against new lookup rules. 1013 */ 1014 if (((cnp->cn_nameiop == CREATE) || (cnp->cn_nameiop == RENAME)) 1015 && (cnp->cn_flags & ISLASTCN) 1016 && (error == ENOENT)) 1017 { 1018 error = EJUSTRETURN; 1019 cnp->cn_flags |= SAVENAME; 1020 *ap->a_vpp = NULL; 1021 } 1022 1023 /* 1024 * If we are removing, and we are at the last element, and we 1025 * found it, then we need to keep the name around so that the 1026 * removal will go ahead as planned. 1027 * XXX Check against new lookup rules. 1028 */ 1029 if ((cnp->cn_nameiop == DELETE) 1030 && (cnp->cn_flags & ISLASTCN) 1031 && !error) 1032 { 1033 cnp->cn_flags |= SAVENAME; 1034 } 1035 1036 /* 1037 * If the lookup succeeded, we must generally lock the returned 1038 * vnode. This could be a ., .., or normal lookup. See 1039 * vnodeops(9) for the details. 1040 */ 1041 /* 1042 * XXX LK_RETRY is likely incorrect. Handle vn_lock failure 1043 * somehow, and remove LK_RETRY. 1044 */ 1045 if (!error || (error == EJUSTRETURN)) { 1046 /* Lookup has a value and it isn't "."? */ 1047 if (*ap->a_vpp && (*ap->a_vpp != dvp)) { 1048 if (flags & ISDOTDOT) 1049 /* ..: unlock parent */ 1050 VOP_UNLOCK(dvp, 0); 1051 /* all but .: lock child */ 1052 vn_lock(*ap->a_vpp, LK_EXCLUSIVE | LK_RETRY); 1053 if (flags & ISDOTDOT) 1054 /* ..: relock parent */ 1055 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1056 } 1057 /* else .: leave dvp locked */ 1058 } else { 1059 /* The lookup failed, so return NULL. Leave dvp locked. */ 1060 *ap->a_vpp = NULL; 1061 } 1062 return(error); 1063 } 1064 1065 /*ARGSUSED*/ 1066 int 1067 coda_create(void *v) 1068 { 1069 /* true args */ 1070 struct vop_create_args *ap = v; 1071 struct vnode *dvp = ap->a_dvp; 1072 struct cnode *dcp = VTOC(dvp); 1073 struct vattr *va = ap->a_vap; 1074 int exclusive = 1; 1075 int mode = ap->a_vap->va_mode; 1076 struct vnode **vpp = ap->a_vpp; 1077 struct componentname *cnp = ap->a_cnp; 1078 kauth_cred_t cred = cnp->cn_cred; 1079 struct lwp *l = cnp->cn_lwp; 1080 /* locals */ 1081 int error; 1082 struct cnode *cp; 1083 const char *nm = cnp->cn_nameptr; 1084 int len = cnp->cn_namelen; 1085 CodaFid VFid; 1086 struct vattr attr; 1087 1088 MARK_ENTRY(CODA_CREATE_STATS); 1089 1090 /* All creates are exclusive XXX */ 1091 /* I'm assuming the 'mode' argument is the file mode bits XXX */ 1092 1093 /* Check for create of control object. */ 1094 if (IS_CTL_NAME(dvp, nm, len)) { 1095 *vpp = (struct vnode *)0; 1096 MARK_INT_FAIL(CODA_CREATE_STATS); 1097 return(EACCES); 1098 } 1099 1100 error = venus_create(vtomi(dvp), &dcp->c_fid, nm, len, exclusive, mode, va, cred, l, &VFid, &attr); 1101 1102 if (!error) { 1103 1104 /* 1105 * XXX Violation of venus/kernel invariants is a difficult case, 1106 * but venus should not be able to cause a panic. 1107 */ 1108 /* If this is an exclusive create, panic if the file already exists. */ 1109 /* Venus should have detected the file and reported EEXIST. */ 1110 1111 if ((exclusive == 1) && 1112 (coda_find(&VFid) != NULL)) 1113 panic("cnode existed for newly created file!"); 1114 1115 cp = make_coda_node(&VFid, dvp->v_mount, attr.va_type); 1116 *vpp = CTOV(cp); 1117 1118 /* XXX vnodeops doesn't say this argument can be changed. */ 1119 /* Update va to reflect the new attributes. */ 1120 (*va) = attr; 1121 1122 /* Update the attribute cache and mark it as valid */ 1123 if (coda_attr_cache) { 1124 VTOC(*vpp)->c_vattr = attr; 1125 VTOC(*vpp)->c_flags |= C_VATTR; 1126 } 1127 1128 /* Invalidate parent's attr cache (modification time has changed). */ 1129 VTOC(dvp)->c_flags &= ~C_VATTR; 1130 1131 /* enter the new vnode in the Name Cache */ 1132 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1133 1134 CODADEBUG(CODA_CREATE, 1135 myprintf(("create: %s, result %d\n", 1136 coda_f2s(&VFid), error)); ) 1137 } else { 1138 *vpp = (struct vnode *)0; 1139 CODADEBUG(CODA_CREATE, myprintf(("create error %d\n", error));) 1140 } 1141 1142 /* 1143 * vnodeops(9) says that we must unlock the parent and lock the child. 1144 * XXX Should we lock the child first? 1145 */ 1146 vput(dvp); 1147 if (!error) { 1148 if ((cnp->cn_flags & LOCKLEAF) == 0) { 1149 /* This should not happen; flags are for lookup only. */ 1150 printf("coda_create: LOCKLEAF not set!\n"); 1151 } 1152 1153 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { 1154 /* XXX Perhaps avoid this panic. */ 1155 panic("coda_create: couldn't lock child"); 1156 } 1157 } 1158 1159 /* Per vnodeops(9), free name except on success and SAVESTART. */ 1160 if (error || (cnp->cn_flags & SAVESTART) == 0) { 1161 PNBUF_PUT(cnp->cn_pnbuf); 1162 } 1163 return(error); 1164 } 1165 1166 int 1167 coda_remove(void *v) 1168 { 1169 /* true args */ 1170 struct vop_remove_args *ap = v; 1171 struct vnode *dvp = ap->a_dvp; 1172 struct cnode *cp = VTOC(dvp); 1173 struct vnode *vp = ap->a_vp; 1174 struct componentname *cnp = ap->a_cnp; 1175 kauth_cred_t cred = cnp->cn_cred; 1176 struct lwp *l = cnp->cn_lwp; 1177 /* locals */ 1178 int error; 1179 const char *nm = cnp->cn_nameptr; 1180 int len = cnp->cn_namelen; 1181 struct cnode *tp; 1182 1183 MARK_ENTRY(CODA_REMOVE_STATS); 1184 1185 CODADEBUG(CODA_REMOVE, myprintf(("remove: %s in %s\n", 1186 nm, coda_f2s(&cp->c_fid)));); 1187 1188 /* Remove the file's entry from the CODA Name Cache */ 1189 /* We're being conservative here, it might be that this person 1190 * doesn't really have sufficient access to delete the file 1191 * but we feel zapping the entry won't really hurt anyone -- dcs 1192 */ 1193 /* I'm gonna go out on a limb here. If a file and a hardlink to it 1194 * exist, and one is removed, the link count on the other will be 1195 * off by 1. We could either invalidate the attrs if cached, or 1196 * fix them. I'll try to fix them. DCS 11/8/94 1197 */ 1198 tp = coda_nc_lookup(VTOC(dvp), nm, len, cred); 1199 if (tp) { 1200 if (VALID_VATTR(tp)) { /* If attrs are cached */ 1201 if (tp->c_vattr.va_nlink > 1) { /* If it's a hard link */ 1202 tp->c_vattr.va_nlink--; 1203 } 1204 } 1205 1206 coda_nc_zapfile(VTOC(dvp), nm, len); 1207 /* No need to flush it if it doesn't exist! */ 1208 } 1209 /* Invalidate the parent's attr cache, the modification time has changed */ 1210 VTOC(dvp)->c_flags &= ~C_VATTR; 1211 1212 /* Check for remove of control object. */ 1213 if (IS_CTL_NAME(dvp, nm, len)) { 1214 MARK_INT_FAIL(CODA_REMOVE_STATS); 1215 return(ENOENT); 1216 } 1217 1218 error = venus_remove(vtomi(dvp), &cp->c_fid, nm, len, cred, l); 1219 1220 CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n",error)); ) 1221 1222 /* 1223 * Unlock parent and child (avoiding double if "."). 1224 */ 1225 if (dvp == vp) { 1226 vrele(vp); 1227 } else { 1228 vput(vp); 1229 } 1230 vput(dvp); 1231 1232 return(error); 1233 } 1234 1235 /* 1236 * dvp is the directory where the link is to go, and is locked. 1237 * vp is the object to be linked to, and is unlocked. 1238 * At exit, we must unlock dvp, and vput dvp. 1239 */ 1240 int 1241 coda_link(void *v) 1242 { 1243 /* true args */ 1244 struct vop_link_args *ap = v; 1245 struct vnode *vp = ap->a_vp; 1246 struct cnode *cp = VTOC(vp); 1247 struct vnode *dvp = ap->a_dvp; 1248 struct cnode *dcp = VTOC(dvp); 1249 struct componentname *cnp = ap->a_cnp; 1250 kauth_cred_t cred = cnp->cn_cred; 1251 struct lwp *l = cnp->cn_lwp; 1252 /* locals */ 1253 int error; 1254 const char *nm = cnp->cn_nameptr; 1255 int len = cnp->cn_namelen; 1256 1257 MARK_ENTRY(CODA_LINK_STATS); 1258 1259 if (codadebug & CODADBGMSK(CODA_LINK)) { 1260 1261 myprintf(("nb_link: vp fid: %s\n", 1262 coda_f2s(&cp->c_fid))); 1263 myprintf(("nb_link: dvp fid: %s)\n", 1264 coda_f2s(&dcp->c_fid))); 1265 1266 } 1267 if (codadebug & CODADBGMSK(CODA_LINK)) { 1268 myprintf(("link: vp fid: %s\n", 1269 coda_f2s(&cp->c_fid))); 1270 myprintf(("link: dvp fid: %s\n", 1271 coda_f2s(&dcp->c_fid))); 1272 1273 } 1274 1275 /* Check for link to/from control object. */ 1276 if (IS_CTL_NAME(dvp, nm, len) || IS_CTL_VP(vp)) { 1277 MARK_INT_FAIL(CODA_LINK_STATS); 1278 return(EACCES); 1279 } 1280 1281 /* If linking . to a name, error out earlier. */ 1282 if (vp == dvp) { 1283 printf("coda_link vp==dvp\n"); 1284 error = EISDIR; 1285 goto exit; 1286 } 1287 1288 /* XXX Why does venus_link need the vnode to be locked?*/ 1289 if ((error = vn_lock(vp, LK_EXCLUSIVE)) != 0) { 1290 printf("coda_link: couldn't lock vnode %p\n", vp); 1291 error = EFAULT; /* XXX better value */ 1292 goto exit; 1293 } 1294 error = venus_link(vtomi(vp), &cp->c_fid, &dcp->c_fid, nm, len, cred, l); 1295 VOP_UNLOCK(vp, 0); 1296 1297 /* Invalidate parent's attr cache (the modification time has changed). */ 1298 VTOC(dvp)->c_flags &= ~C_VATTR; 1299 /* Invalidate child's attr cache (XXX why). */ 1300 VTOC(vp)->c_flags &= ~C_VATTR; 1301 1302 CODADEBUG(CODA_LINK, myprintf(("in link result %d\n",error)); ) 1303 1304 exit: 1305 vput(dvp); 1306 return(error); 1307 } 1308 1309 int 1310 coda_rename(void *v) 1311 { 1312 /* true args */ 1313 struct vop_rename_args *ap = v; 1314 struct vnode *odvp = ap->a_fdvp; 1315 struct cnode *odcp = VTOC(odvp); 1316 struct componentname *fcnp = ap->a_fcnp; 1317 struct vnode *ndvp = ap->a_tdvp; 1318 struct cnode *ndcp = VTOC(ndvp); 1319 struct componentname *tcnp = ap->a_tcnp; 1320 kauth_cred_t cred = fcnp->cn_cred; 1321 struct lwp *l = fcnp->cn_lwp; 1322 /* true args */ 1323 int error; 1324 const char *fnm = fcnp->cn_nameptr; 1325 int flen = fcnp->cn_namelen; 1326 const char *tnm = tcnp->cn_nameptr; 1327 int tlen = tcnp->cn_namelen; 1328 1329 MARK_ENTRY(CODA_RENAME_STATS); 1330 1331 /* Hmmm. The vnodes are already looked up. Perhaps they are locked? 1332 This could be Bad. XXX */ 1333 #ifdef OLD_DIAGNOSTIC 1334 if ((fcnp->cn_cred != tcnp->cn_cred) 1335 || (fcnp->cn_lwp != tcnp->cn_lwp)) 1336 { 1337 panic("coda_rename: component names don't agree"); 1338 } 1339 #endif 1340 1341 /* Check for rename involving control object. */ 1342 if (IS_CTL_NAME(odvp, fnm, flen) || IS_CTL_NAME(ndvp, tnm, tlen)) { 1343 MARK_INT_FAIL(CODA_RENAME_STATS); 1344 return(EACCES); 1345 } 1346 1347 /* Problem with moving directories -- need to flush entry for .. */ 1348 if (odvp != ndvp) { 1349 struct cnode *ovcp = coda_nc_lookup(VTOC(odvp), fnm, flen, cred); 1350 if (ovcp) { 1351 struct vnode *ovp = CTOV(ovcp); 1352 if ((ovp) && 1353 (ovp->v_type == VDIR)) /* If it's a directory */ 1354 coda_nc_zapfile(VTOC(ovp),"..", 2); 1355 } 1356 } 1357 1358 /* Remove the entries for both source and target files */ 1359 coda_nc_zapfile(VTOC(odvp), fnm, flen); 1360 coda_nc_zapfile(VTOC(ndvp), tnm, tlen); 1361 1362 /* Invalidate the parent's attr cache, the modification time has changed */ 1363 VTOC(odvp)->c_flags &= ~C_VATTR; 1364 VTOC(ndvp)->c_flags &= ~C_VATTR; 1365 1366 if (flen+1 > CODA_MAXNAMLEN) { 1367 MARK_INT_FAIL(CODA_RENAME_STATS); 1368 error = EINVAL; 1369 goto exit; 1370 } 1371 1372 if (tlen+1 > CODA_MAXNAMLEN) { 1373 MARK_INT_FAIL(CODA_RENAME_STATS); 1374 error = EINVAL; 1375 goto exit; 1376 } 1377 1378 error = venus_rename(vtomi(odvp), &odcp->c_fid, &ndcp->c_fid, fnm, flen, tnm, tlen, cred, l); 1379 1380 exit: 1381 CODADEBUG(CODA_RENAME, myprintf(("in rename result %d\n",error));) 1382 /* XXX - do we need to call cache pureg on the moved vnode? */ 1383 cache_purge(ap->a_fvp); 1384 1385 /* It seems to be incumbent on us to drop locks on all four vnodes */ 1386 /* From-vnodes are not locked, only ref'd. To-vnodes are locked. */ 1387 1388 vrele(ap->a_fvp); 1389 vrele(odvp); 1390 1391 if (ap->a_tvp) { 1392 if (ap->a_tvp == ndvp) { 1393 vrele(ap->a_tvp); 1394 } else { 1395 vput(ap->a_tvp); 1396 } 1397 } 1398 1399 vput(ndvp); 1400 return(error); 1401 } 1402 1403 int 1404 coda_mkdir(void *v) 1405 { 1406 /* true args */ 1407 struct vop_mkdir_args *ap = v; 1408 struct vnode *dvp = ap->a_dvp; 1409 struct cnode *dcp = VTOC(dvp); 1410 struct componentname *cnp = ap->a_cnp; 1411 struct vattr *va = ap->a_vap; 1412 struct vnode **vpp = ap->a_vpp; 1413 kauth_cred_t cred = cnp->cn_cred; 1414 struct lwp *l = cnp->cn_lwp; 1415 /* locals */ 1416 int error; 1417 const char *nm = cnp->cn_nameptr; 1418 int len = cnp->cn_namelen; 1419 struct cnode *cp; 1420 CodaFid VFid; 1421 struct vattr ova; 1422 1423 MARK_ENTRY(CODA_MKDIR_STATS); 1424 1425 /* Check for mkdir of target object. */ 1426 if (IS_CTL_NAME(dvp, nm, len)) { 1427 *vpp = (struct vnode *)0; 1428 MARK_INT_FAIL(CODA_MKDIR_STATS); 1429 return(EACCES); 1430 } 1431 1432 if (len+1 > CODA_MAXNAMLEN) { 1433 *vpp = (struct vnode *)0; 1434 MARK_INT_FAIL(CODA_MKDIR_STATS); 1435 return(EACCES); 1436 } 1437 1438 error = venus_mkdir(vtomi(dvp), &dcp->c_fid, nm, len, va, cred, l, &VFid, &ova); 1439 1440 if (!error) { 1441 if (coda_find(&VFid) != NULL) 1442 panic("cnode existed for newly created directory!"); 1443 1444 1445 cp = make_coda_node(&VFid, dvp->v_mount, va->va_type); 1446 *vpp = CTOV(cp); 1447 1448 /* enter the new vnode in the Name Cache */ 1449 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1450 1451 /* as a side effect, enter "." and ".." for the directory */ 1452 coda_nc_enter(VTOC(*vpp), ".", 1, cred, VTOC(*vpp)); 1453 coda_nc_enter(VTOC(*vpp), "..", 2, cred, VTOC(dvp)); 1454 1455 if (coda_attr_cache) { 1456 VTOC(*vpp)->c_vattr = ova; /* update the attr cache */ 1457 VTOC(*vpp)->c_flags |= C_VATTR; /* Valid attributes in cnode */ 1458 } 1459 1460 /* Invalidate the parent's attr cache, the modification time has changed */ 1461 VTOC(dvp)->c_flags &= ~C_VATTR; 1462 1463 CODADEBUG( CODA_MKDIR, myprintf(("mkdir: %s result %d\n", 1464 coda_f2s(&VFid), error)); ) 1465 } else { 1466 *vpp = (struct vnode *)0; 1467 CODADEBUG(CODA_MKDIR, myprintf(("mkdir error %d\n",error));) 1468 } 1469 1470 /* 1471 * Currently, all mkdirs explicitly vput their dvp's. 1472 * It also appears that we *must* lock the vpp, since 1473 * lockleaf isn't set, but someone down the road is going 1474 * to try to unlock the new directory. 1475 */ 1476 vput(dvp); 1477 if (!error) { 1478 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { 1479 panic("coda_mkdir: couldn't lock child"); 1480 } 1481 } 1482 1483 /* Per vnodeops(9), free name except on success and SAVESTART. */ 1484 if (error || (cnp->cn_flags & SAVESTART) == 0) { 1485 PNBUF_PUT(cnp->cn_pnbuf); 1486 } 1487 return(error); 1488 } 1489 1490 int 1491 coda_rmdir(void *v) 1492 { 1493 /* true args */ 1494 struct vop_rmdir_args *ap = v; 1495 struct vnode *dvp = ap->a_dvp; 1496 struct cnode *dcp = VTOC(dvp); 1497 struct vnode *vp = ap->a_vp; 1498 struct componentname *cnp = ap->a_cnp; 1499 kauth_cred_t cred = cnp->cn_cred; 1500 struct lwp *l = cnp->cn_lwp; 1501 /* true args */ 1502 int error; 1503 const char *nm = cnp->cn_nameptr; 1504 int len = cnp->cn_namelen; 1505 struct cnode *cp; 1506 1507 MARK_ENTRY(CODA_RMDIR_STATS); 1508 1509 /* Check for rmdir of control object. */ 1510 if (IS_CTL_NAME(dvp, nm, len)) { 1511 MARK_INT_FAIL(CODA_RMDIR_STATS); 1512 return(ENOENT); 1513 } 1514 1515 /* Can't remove . in self. */ 1516 if (dvp == vp) { 1517 printf("coda_rmdir: dvp == vp\n"); 1518 error = EINVAL; 1519 goto exit; 1520 } 1521 1522 /* 1523 * The caller may not have adequate permissions, and the venus 1524 * operation may fail, but it doesn't hurt from a correctness 1525 * viewpoint to invalidate cache entries. 1526 * XXX Why isn't this done after the venus_rmdir call? 1527 */ 1528 /* Look up child in name cache (by name, from parent). */ 1529 cp = coda_nc_lookup(dcp, nm, len, cred); 1530 /* If found, remove all children of the child (., ..). */ 1531 if (cp) coda_nc_zapParentfid(&(cp->c_fid), NOT_DOWNCALL); 1532 1533 /* Remove child's own entry. */ 1534 coda_nc_zapfile(dcp, nm, len); 1535 1536 /* Invalidate parent's attr cache (the modification time has changed). */ 1537 dcp->c_flags &= ~C_VATTR; 1538 1539 error = venus_rmdir(vtomi(dvp), &dcp->c_fid, nm, len, cred, l); 1540 1541 CODADEBUG(CODA_RMDIR, myprintf(("in rmdir result %d\n", error)); ) 1542 1543 exit: 1544 /* vput both vnodes */ 1545 vput(dvp); 1546 if (dvp == vp) { 1547 vrele(vp); 1548 } else { 1549 vput(vp); 1550 } 1551 1552 return(error); 1553 } 1554 1555 int 1556 coda_symlink(void *v) 1557 { 1558 /* true args */ 1559 struct vop_symlink_args *ap = v; 1560 struct vnode *dvp = ap->a_dvp; 1561 struct cnode *dcp = VTOC(dvp); 1562 /* a_vpp is used in place below */ 1563 struct componentname *cnp = ap->a_cnp; 1564 struct vattr *tva = ap->a_vap; 1565 char *path = ap->a_target; 1566 kauth_cred_t cred = cnp->cn_cred; 1567 struct lwp *l = cnp->cn_lwp; 1568 /* locals */ 1569 int error; 1570 u_long saved_cn_flags; 1571 const char *nm = cnp->cn_nameptr; 1572 int len = cnp->cn_namelen; 1573 int plen = strlen(path); 1574 1575 /* 1576 * Here's the strategy for the moment: perform the symlink, then 1577 * do a lookup to grab the resulting vnode. I know this requires 1578 * two communications with Venus for a new sybolic link, but 1579 * that's the way the ball bounces. I don't yet want to change 1580 * the way the Mach symlink works. When Mach support is 1581 * deprecated, we should change symlink so that the common case 1582 * returns the resultant vnode in a vpp argument. 1583 */ 1584 1585 MARK_ENTRY(CODA_SYMLINK_STATS); 1586 1587 /* Check for symlink of control object. */ 1588 if (IS_CTL_NAME(dvp, nm, len)) { 1589 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1590 error = EACCES; 1591 goto exit; 1592 } 1593 1594 if (plen+1 > CODA_MAXPATHLEN) { 1595 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1596 error = EINVAL; 1597 goto exit; 1598 } 1599 1600 if (len+1 > CODA_MAXNAMLEN) { 1601 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1602 error = EINVAL; 1603 goto exit; 1604 } 1605 1606 error = venus_symlink(vtomi(dvp), &dcp->c_fid, path, plen, nm, len, tva, cred, l); 1607 1608 /* Invalidate the parent's attr cache (modification time has changed). */ 1609 dcp->c_flags &= ~C_VATTR; 1610 1611 if (!error) { 1612 /* 1613 * VOP_SYMLINK is not defined to pay attention to cnp->cn_flags; 1614 * these are defined only for VOP_LOOKUP. We desire to reuse 1615 * cnp for a VOP_LOOKUP operation, and must be sure to not pass 1616 * stray flags passed to us. Such stray flags can occur because 1617 * sys_symlink makes a namei call and then reuses the 1618 * componentname structure. 1619 */ 1620 /* 1621 * XXX Arguably we should create our own componentname structure 1622 * and not reuse the one that was passed in. 1623 */ 1624 saved_cn_flags = cnp->cn_flags; 1625 cnp->cn_flags &= ~(MODMASK | OPMASK); 1626 cnp->cn_flags |= LOOKUP; 1627 error = VOP_LOOKUP(dvp, ap->a_vpp, cnp); 1628 cnp->cn_flags = saved_cn_flags; 1629 /* Either an error occurs, or ap->a_vpp is locked. */ 1630 } 1631 1632 exit: 1633 /* unlock and deference parent */ 1634 vput(dvp); 1635 1636 /* Per vnodeops(9), free name except on success and SAVESTART. */ 1637 if (error || (cnp->cn_flags & SAVESTART) == 0) { 1638 PNBUF_PUT(cnp->cn_pnbuf); 1639 } 1640 1641 CODADEBUG(CODA_SYMLINK, myprintf(("in symlink result %d\n",error)); ) 1642 return(error); 1643 } 1644 1645 /* 1646 * Read directory entries. 1647 */ 1648 int 1649 coda_readdir(void *v) 1650 { 1651 /* true args */ 1652 struct vop_readdir_args *ap = v; 1653 struct vnode *vp = ap->a_vp; 1654 struct cnode *cp = VTOC(vp); 1655 struct uio *uiop = ap->a_uio; 1656 kauth_cred_t cred = ap->a_cred; 1657 int *eofflag = ap->a_eofflag; 1658 off_t **cookies = ap->a_cookies; 1659 int *ncookies = ap->a_ncookies; 1660 /* upcall decl */ 1661 /* locals */ 1662 struct lwp *l = curlwp; 1663 int error = 0; 1664 1665 MARK_ENTRY(CODA_READDIR_STATS); 1666 1667 CODADEBUG(CODA_READDIR, myprintf(("coda_readdir(%p, %lu, %lld)\n", uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, (long long) uiop->uio_offset)); ) 1668 1669 /* Check for readdir of control object. */ 1670 if (IS_CTL_VP(vp)) { 1671 MARK_INT_FAIL(CODA_READDIR_STATS); 1672 return(ENOENT); 1673 } 1674 1675 { 1676 /* Redirect the request to UFS. */ 1677 1678 /* If directory is not already open do an "internal open" on it. */ 1679 int opened_internally = 0; 1680 if (cp->c_ovp == NULL) { 1681 opened_internally = 1; 1682 MARK_INT_GEN(CODA_OPEN_STATS); 1683 error = VOP_OPEN(vp, FREAD, cred, l); 1684 #ifdef CODA_VERBOSE 1685 printf("coda_readdir: Internally Opening %p\n", vp); 1686 #endif 1687 if (error) return(error); 1688 } else 1689 vp = cp->c_ovp; 1690 1691 /* Have UFS handle the call. */ 1692 CODADEBUG(CODA_READDIR, myprintf(( 1693 "indirect readdir: fid = %s, refcnt = %d\n", 1694 coda_f2s(&cp->c_fid), vp->v_usecount)); ) 1695 error = VOP_READDIR(vp, uiop, cred, eofflag, cookies, ncookies); 1696 if (error) 1697 MARK_INT_FAIL(CODA_READDIR_STATS); 1698 else 1699 MARK_INT_SAT(CODA_READDIR_STATS); 1700 1701 /* Do an "internal close" if necessary. */ 1702 if (opened_internally) { 1703 MARK_INT_GEN(CODA_CLOSE_STATS); 1704 (void)VOP_CLOSE(vp, FREAD, cred, l); 1705 } 1706 } 1707 1708 return(error); 1709 } 1710 1711 /* 1712 * Convert from file system blocks to device blocks 1713 */ 1714 int 1715 coda_bmap(void *v) 1716 { 1717 /* XXX on the global proc */ 1718 /* true args */ 1719 struct vop_bmap_args *ap = v; 1720 struct vnode *vp __attribute__((unused)) = ap->a_vp; /* file's vnode */ 1721 daddr_t bn __attribute__((unused)) = ap->a_bn; /* fs block number */ 1722 struct vnode **vpp = ap->a_vpp; /* RETURN vp of device */ 1723 daddr_t *bnp __attribute__((unused)) = ap->a_bnp; /* RETURN device block number */ 1724 struct lwp *l __attribute__((unused)) = curlwp; 1725 /* upcall decl */ 1726 /* locals */ 1727 1728 *vpp = (struct vnode *)0; 1729 myprintf(("coda_bmap called!\n")); 1730 return(EINVAL); 1731 } 1732 1733 /* 1734 * I don't think the following two things are used anywhere, so I've 1735 * commented them out 1736 * 1737 * struct buf *async_bufhead; 1738 * int async_daemon_count; 1739 */ 1740 int 1741 coda_strategy(void *v) 1742 { 1743 /* true args */ 1744 struct vop_strategy_args *ap = v; 1745 struct buf *bp __attribute__((unused)) = ap->a_bp; 1746 struct lwp *l __attribute__((unused)) = curlwp; 1747 /* upcall decl */ 1748 /* locals */ 1749 1750 myprintf(("coda_strategy called! ")); 1751 return(EINVAL); 1752 } 1753 1754 int 1755 coda_reclaim(void *v) 1756 { 1757 /* true args */ 1758 struct vop_reclaim_args *ap = v; 1759 struct vnode *vp = ap->a_vp; 1760 struct cnode *cp = VTOC(vp); 1761 /* upcall decl */ 1762 /* locals */ 1763 1764 /* 1765 * Forced unmount/flush will let vnodes with non zero use be destroyed! 1766 */ 1767 ENTRY; 1768 1769 if (IS_UNMOUNTING(cp)) { 1770 #ifdef DEBUG 1771 if (VTOC(vp)->c_ovp) { 1772 if (IS_UNMOUNTING(cp)) 1773 printf("coda_reclaim: c_ovp not void: vp %p, cp %p\n", vp, cp); 1774 } 1775 #endif 1776 } else { 1777 #ifdef OLD_DIAGNOSTIC 1778 if (vp->v_usecount != 0) 1779 print("coda_reclaim: pushing active %p\n", vp); 1780 if (VTOC(vp)->c_ovp) { 1781 panic("coda_reclaim: c_ovp not void"); 1782 } 1783 #endif 1784 } 1785 cache_purge(vp); 1786 coda_free(VTOC(vp)); 1787 SET_VTOC(vp) = NULL; 1788 return (0); 1789 } 1790 1791 int 1792 coda_lock(void *v) 1793 { 1794 /* true args */ 1795 struct vop_lock_args *ap = v; 1796 struct vnode *vp = ap->a_vp; 1797 struct cnode *cp = VTOC(vp); 1798 /* upcall decl */ 1799 /* locals */ 1800 1801 ENTRY; 1802 1803 if (coda_lockdebug) { 1804 myprintf(("Attempting lock on %s\n", 1805 coda_f2s(&cp->c_fid))); 1806 } 1807 1808 return (lockmgr(&vp->v_lock, ap->a_flags, &vp->v_interlock)); 1809 } 1810 1811 int 1812 coda_unlock(void *v) 1813 { 1814 /* true args */ 1815 struct vop_unlock_args *ap = v; 1816 struct vnode *vp = ap->a_vp; 1817 struct cnode *cp = VTOC(vp); 1818 /* upcall decl */ 1819 /* locals */ 1820 1821 ENTRY; 1822 if (coda_lockdebug) { 1823 myprintf(("Attempting unlock on %s\n", 1824 coda_f2s(&cp->c_fid))); 1825 } 1826 1827 return (lockmgr(&vp->v_lock, ap->a_flags | LK_RELEASE, &vp->v_interlock)); 1828 } 1829 1830 int 1831 coda_islocked(void *v) 1832 { 1833 /* true args */ 1834 struct vop_islocked_args *ap = v; 1835 ENTRY; 1836 1837 return (lockstatus(&ap->a_vp->v_lock)); 1838 } 1839 1840 /* 1841 * Given a device and inode, obtain a locked vnode. One reference is 1842 * obtained and passed back to the caller. 1843 */ 1844 int 1845 coda_grab_vnode(dev_t dev, ino_t ino, struct vnode **vpp) 1846 { 1847 int error; 1848 struct mount *mp; 1849 1850 /* Obtain mount point structure from device. */ 1851 if (!(mp = devtomp(dev))) { 1852 myprintf(("coda_grab_vnode: devtomp(%d) returns NULL\n", dev)); 1853 return(ENXIO); 1854 } 1855 1856 /* 1857 * Obtain vnode from mount point and inode. 1858 * XXX VFS_VGET does not clearly define locked/referenced state of 1859 * returned vnode. 1860 */ 1861 error = VFS_VGET(mp, ino, vpp); 1862 if (error) { 1863 myprintf(("coda_grab_vnode: iget/vget(%d, %llu) returns %p, err %d\n", 1864 dev, (unsigned long long)ino, *vpp, error)); 1865 return(ENOENT); 1866 } 1867 return(0); 1868 } 1869 1870 void 1871 print_vattr(struct vattr *attr) 1872 { 1873 const char *typestr; 1874 1875 switch (attr->va_type) { 1876 case VNON: 1877 typestr = "VNON"; 1878 break; 1879 case VREG: 1880 typestr = "VREG"; 1881 break; 1882 case VDIR: 1883 typestr = "VDIR"; 1884 break; 1885 case VBLK: 1886 typestr = "VBLK"; 1887 break; 1888 case VCHR: 1889 typestr = "VCHR"; 1890 break; 1891 case VLNK: 1892 typestr = "VLNK"; 1893 break; 1894 case VSOCK: 1895 typestr = "VSCK"; 1896 break; 1897 case VFIFO: 1898 typestr = "VFFO"; 1899 break; 1900 case VBAD: 1901 typestr = "VBAD"; 1902 break; 1903 default: 1904 typestr = "????"; 1905 break; 1906 } 1907 1908 1909 myprintf(("attr: type %s mode %d uid %d gid %d fsid %d rdev %d\n", 1910 typestr, (int)attr->va_mode, (int)attr->va_uid, 1911 (int)attr->va_gid, (int)attr->va_fsid, (int)attr->va_rdev)); 1912 1913 myprintf((" fileid %d nlink %d size %d blocksize %d bytes %d\n", 1914 (int)attr->va_fileid, (int)attr->va_nlink, 1915 (int)attr->va_size, 1916 (int)attr->va_blocksize,(int)attr->va_bytes)); 1917 myprintf((" gen %ld flags %ld vaflags %d\n", 1918 attr->va_gen, attr->va_flags, attr->va_vaflags)); 1919 myprintf((" atime sec %d nsec %d\n", 1920 (int)attr->va_atime.tv_sec, (int)attr->va_atime.tv_nsec)); 1921 myprintf((" mtime sec %d nsec %d\n", 1922 (int)attr->va_mtime.tv_sec, (int)attr->va_mtime.tv_nsec)); 1923 myprintf((" ctime sec %d nsec %d\n", 1924 (int)attr->va_ctime.tv_sec, (int)attr->va_ctime.tv_nsec)); 1925 } 1926 1927 /* How to print a ucred */ 1928 void 1929 print_cred(kauth_cred_t cred) 1930 { 1931 1932 uint16_t ngroups; 1933 int i; 1934 1935 myprintf(("ref %d\tuid %d\n", kauth_cred_getrefcnt(cred), 1936 kauth_cred_geteuid(cred))); 1937 1938 ngroups = kauth_cred_ngroups(cred); 1939 for (i=0; i < ngroups; i++) 1940 myprintf(("\tgroup %d: (%d)\n", i, kauth_cred_group(cred, i))); 1941 myprintf(("\n")); 1942 1943 } 1944 1945 /* 1946 * Return a vnode for the given fid. 1947 * If no cnode exists for this fid create one and put it 1948 * in a table hashed by coda_f2i(). If the cnode for 1949 * this fid is already in the table return it (ref count is 1950 * incremented by coda_find. The cnode will be flushed from the 1951 * table when coda_inactive calls coda_unsave. 1952 */ 1953 struct cnode * 1954 make_coda_node(CodaFid *fid, struct mount *vfsp, short type) 1955 { 1956 struct cnode *cp; 1957 int err; 1958 1959 if ((cp = coda_find(fid)) == NULL) { 1960 struct vnode *vp; 1961 1962 cp = coda_alloc(); 1963 cp->c_fid = *fid; 1964 1965 err = getnewvnode(VT_CODA, vfsp, coda_vnodeop_p, &vp); 1966 if (err) { 1967 panic("coda: getnewvnode returned error %d", err); 1968 } 1969 vp->v_data = cp; 1970 vp->v_type = type; 1971 cp->c_vnode = vp; 1972 coda_save(cp); 1973 1974 } else { 1975 vref(CTOV(cp)); 1976 } 1977 1978 return cp; 1979 } 1980 1981 /* 1982 * coda_getpages may be called on a vnode which has not been opened, 1983 * e.g. to fault in pages to execute a program. In that case, we must 1984 * open the file to get the container. The vnode may or may not be 1985 * locked, and we must leave it in the same state. 1986 * XXX The protocol apparently requires v_uobj.vmobjlock to be 1987 * held by caller, but this isn't documented. 1988 * XXX Most code uses v_interlock instead, which is really the same 1989 * variable. 1990 */ 1991 int 1992 coda_getpages(void *v) 1993 { 1994 struct vop_getpages_args /* { 1995 struct vnode *a_vp; 1996 voff_t a_offset; 1997 struct vm_page **a_m; 1998 int *a_count; 1999 int a_centeridx; 2000 vm_prot_t a_access_type; 2001 int a_advice; 2002 int a_flags; 2003 } */ *ap = v; 2004 struct vnode *vp = ap->a_vp; 2005 struct cnode *cp = VTOC(vp); 2006 struct lwp *l = curlwp; 2007 kauth_cred_t cred = l->l_cred; 2008 int error, cerror; 2009 int waslocked; /* 1 if vnode lock was held on entry */ 2010 int didopen = 0; /* 1 if we opened container file */ 2011 2012 /* 2013 * Handle a case that uvm_fault doesn't quite use yet. 2014 * See layer_vnops.c. for inspiration. 2015 */ 2016 if (ap->a_flags & PGO_LOCKED) { 2017 return EBUSY; 2018 } 2019 2020 /* Check for control object. */ 2021 if (IS_CTL_VP(vp)) { 2022 printf("coda_getpages: control object %p\n", vp); 2023 simple_unlock(&vp->v_interlock); 2024 return(EINVAL); 2025 } 2026 2027 /* 2028 * XXX It's really not ok to be releasing the lock we get, 2029 * because we could be overlapping with another call to 2030 * getpages and drop a lock they are relying on. We need to 2031 * figure out whether getpages ever is called holding the 2032 * lock, and if we should serialize getpages calls by some 2033 * mechanism. 2034 */ 2035 waslocked = VOP_ISLOCKED(vp); 2036 2037 /* Drop vmobj lock. */ 2038 simple_unlock(&vp->v_interlock); 2039 2040 /* Get container file if not already present. */ 2041 if (cp->c_ovp == NULL) { 2042 /* 2043 * VOP_OPEN requires a locked vnode. We must avoid 2044 * locking the vnode if it is already locked, and 2045 * leave it in the same state on exit. 2046 */ 2047 if (waslocked == 0) { 2048 cerror = vn_lock(vp, LK_EXCLUSIVE); 2049 if (cerror) { 2050 printf("coda_getpages: can't lock vnode %p\n", 2051 vp); 2052 simple_unlock(&vp->v_interlock); 2053 return cerror; 2054 } 2055 #if 0 2056 printf("coda_getpages: locked vnode %p\n", vp); 2057 #endif 2058 } 2059 2060 /* 2061 * Open file (causes upcall to venus). 2062 * XXX Perhaps we should not fully open the file, but 2063 * simply obtain a container file. 2064 */ 2065 /* XXX Is it ok to do this while holding the simplelock? */ 2066 cerror = VOP_OPEN(vp, FREAD, cred, l); 2067 2068 if (cerror) { 2069 printf("coda_getpages: cannot open vnode %p => %d\n", 2070 vp, cerror); 2071 if (waslocked == 0) 2072 VOP_UNLOCK(vp, 0); 2073 simple_unlock(&vp->v_interlock); 2074 return cerror; 2075 } 2076 2077 #if 0 2078 printf("coda_getpages: opened vnode %p\n", vp); 2079 #endif 2080 didopen = 1; 2081 } 2082 KASSERT(cp->c_ovp != NULL); 2083 2084 /* Like LAYERVPTOLOWERVP, but coda doesn't use the layer struct. */ 2085 ap->a_vp = cp->c_ovp; 2086 2087 /* Get the lock on the container vnode, and call getpages on it. */ 2088 simple_lock(&ap->a_vp->v_interlock); 2089 error = VCALL(ap->a_vp, VOFFSET(vop_getpages), ap); 2090 2091 /* If we opened the vnode, we must close it. */ 2092 if (didopen) { 2093 /* 2094 * VOP_CLOSE requires a locked vnode, but we are still 2095 * holding the lock (or riding a caller's lock). 2096 */ 2097 cerror = VOP_CLOSE(vp, FREAD, cred, l); 2098 if (cerror != 0) 2099 /* XXX How should we handle this? */ 2100 printf("coda_getpages: closed vnode %p -> %d\n", 2101 vp, cerror); 2102 2103 /* If we obtained a lock, drop it. */ 2104 if (waslocked == 0) 2105 VOP_UNLOCK(vp, 0); 2106 } 2107 2108 return error; 2109 } 2110 2111 /* 2112 * The protocol requires v_uobj.vmobjlock to be held by the caller, as 2113 * documented in vnodeops(9). 2114 * XXX vnode_if.src doesn't say this. 2115 * XXX Most code uses v_interlock instead, which is really the same 2116 * variable. 2117 */ 2118 int 2119 coda_putpages(void *v) 2120 { 2121 struct vop_putpages_args /* { 2122 struct vnode *a_vp; 2123 voff_t a_offlo; 2124 voff_t a_offhi; 2125 int a_flags; 2126 } */ *ap = v; 2127 struct vnode *vp = ap->a_vp; 2128 struct cnode *cp = VTOC(vp); 2129 int error; 2130 2131 /* Check for control object. */ 2132 if (IS_CTL_VP(vp)) { 2133 printf("coda_putpages: control object %p\n", vp); 2134 simple_unlock(&vp->v_interlock); 2135 return(EINVAL); 2136 } 2137 2138 /* Drop the vmobj lock. */ 2139 simple_unlock(&vp->v_interlock); 2140 2141 /* 2142 * If container object is not present, then there are no pages 2143 * to put; just return without error. This happens all the 2144 * time, apparently during discard of a closed vnode (which 2145 * trivially can't have dirty pages). 2146 */ 2147 if (cp->c_ovp == NULL) 2148 return 0; 2149 2150 /* Like LAYERVPTOLOWERVP, but coda doesn't use the layer struct. */ 2151 ap->a_vp = cp->c_ovp; 2152 2153 /* Get the lock on the container vnode, and call putpages on it. */ 2154 simple_lock(&ap->a_vp->v_interlock); 2155 error = VCALL(ap->a_vp, VOFFSET(vop_putpages), ap); 2156 2157 return error; 2158 } 2159
Indexes created Wed Oct 15 16:09:53 GMT 2025