coda_vnops.c revision 1.90.4.1
1 /* $NetBSD: coda_vnops.c,v 1.90.4.1 2014/05/18 17:45:31 rmind 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 1.90.4.1 2014/05/18 17:45:31 rmind 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/vnode.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 static int coda_lockdebug = 0; 95 96 #define ENTRY if(coda_vnop_print_entry) myprintf(("Entered %s\n",__func__)) 97 98 /* Definition of the vnode operation vector */ 99 100 const struct vnodeopv_entry_desc coda_vnodeop_entries[] = { 101 { &vop_default_desc, coda_vop_error }, 102 { &vop_lookup_desc, coda_lookup }, /* lookup */ 103 { &vop_create_desc, coda_create }, /* create */ 104 { &vop_mknod_desc, coda_vop_error }, /* mknod */ 105 { &vop_open_desc, coda_open }, /* open */ 106 { &vop_close_desc, coda_close }, /* close */ 107 { &vop_access_desc, coda_access }, /* access */ 108 { &vop_getattr_desc, coda_getattr }, /* getattr */ 109 { &vop_setattr_desc, coda_setattr }, /* setattr */ 110 { &vop_read_desc, coda_read }, /* read */ 111 { &vop_write_desc, coda_write }, /* write */ 112 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 113 { &vop_ioctl_desc, coda_ioctl }, /* ioctl */ 114 { &vop_mmap_desc, genfs_mmap }, /* mmap */ 115 { &vop_fsync_desc, coda_fsync }, /* fsync */ 116 { &vop_remove_desc, coda_remove }, /* remove */ 117 { &vop_link_desc, coda_link }, /* link */ 118 { &vop_rename_desc, coda_rename }, /* rename */ 119 { &vop_mkdir_desc, coda_mkdir }, /* mkdir */ 120 { &vop_rmdir_desc, coda_rmdir }, /* rmdir */ 121 { &vop_symlink_desc, coda_symlink }, /* symlink */ 122 { &vop_readdir_desc, coda_readdir }, /* readdir */ 123 { &vop_readlink_desc, coda_readlink }, /* readlink */ 124 { &vop_abortop_desc, coda_abortop }, /* abortop */ 125 { &vop_inactive_desc, coda_inactive }, /* inactive */ 126 { &vop_reclaim_desc, coda_reclaim }, /* reclaim */ 127 { &vop_lock_desc, coda_lock }, /* lock */ 128 { &vop_unlock_desc, coda_unlock }, /* unlock */ 129 { &vop_bmap_desc, coda_bmap }, /* bmap */ 130 { &vop_strategy_desc, coda_strategy }, /* strategy */ 131 { &vop_print_desc, coda_vop_error }, /* print */ 132 { &vop_islocked_desc, coda_islocked }, /* islocked */ 133 { &vop_pathconf_desc, coda_vop_error }, /* pathconf */ 134 { &vop_advlock_desc, coda_vop_nop }, /* advlock */ 135 { &vop_bwrite_desc, coda_vop_error }, /* bwrite */ 136 { &vop_seek_desc, genfs_seek }, /* seek */ 137 { &vop_poll_desc, genfs_poll }, /* poll */ 138 { &vop_getpages_desc, coda_getpages }, /* getpages */ 139 { &vop_putpages_desc, coda_putpages }, /* putpages */ 140 { NULL, NULL } 141 }; 142 143 static void coda_print_vattr(struct vattr *); 144 145 int (**coda_vnodeop_p)(void *); 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(("%s: Vnode operation %s called (error).\n", 160 __func__, (*desc)->vdesc_name)); 161 } 162 163 return EIO; 164 } 165 166 /* A generic do-nothing. */ 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 vnode_t *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 /* locals */ 225 int error; 226 dev_t dev; /* container file device, inode, vnode */ 227 ino_t inode; 228 vnode_t *container_vp; 229 230 MARK_ENTRY(CODA_OPEN_STATS); 231 232 KASSERT(VOP_ISLOCKED(vp)); 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, curlwp, &dev, &inode); 245 if (error) 246 return (error); 247 if (!error) { 248 CODADEBUG(CODA_OPEN, myprintf(( 249 "%s: dev 0x%llx inode %llu result %d\n", __func__, 250 (unsigned long long)dev, (unsigned long long)inode, error));) 251 } 252 253 /* 254 * Obtain locked and referenced container vnode from container 255 * device/inode. 256 */ 257 error = coda_grab_vnode(vp, dev, inode, &container_vp); 258 if (error) 259 return (error); 260 261 /* Save the vnode pointer for the container file. */ 262 if (cp->c_ovp == NULL) { 263 cp->c_ovp = container_vp; 264 } else { 265 if (cp->c_ovp != container_vp) 266 /* 267 * Perhaps venus returned a different container, or 268 * something else went wrong. 269 */ 270 panic("%s: cp->c_ovp != container_vp", __func__); 271 } 272 cp->c_ocount++; 273 274 /* Flush the attribute cache if writing the file. */ 275 if (flag & FWRITE) { 276 cp->c_owrite++; 277 cp->c_flags &= ~C_VATTR; 278 } 279 280 /* 281 * Save the <device, inode> pair for the container file to speed 282 * up subsequent reads while closed (mmap, program execution). 283 * This is perhaps safe because venus will invalidate the node 284 * before changing the container file mapping. 285 */ 286 cp->c_device = dev; 287 cp->c_inode = inode; 288 289 /* Open the container file. */ 290 error = VOP_OPEN(container_vp, flag, cred); 291 /* 292 * Drop the lock on the container, after we have done VOP_OPEN 293 * (which requires a locked vnode). 294 */ 295 VOP_UNLOCK(container_vp); 296 return(error); 297 } 298 299 /* 300 * Close the cache file used for I/O and notify Venus. 301 */ 302 int 303 coda_close(void *v) 304 { 305 /* true args */ 306 struct vop_close_args *ap = v; 307 vnode_t *vp = ap->a_vp; 308 struct cnode *cp = VTOC(vp); 309 int flag = ap->a_fflag; 310 kauth_cred_t cred = ap->a_cred; 311 /* locals */ 312 int error; 313 314 MARK_ENTRY(CODA_CLOSE_STATS); 315 316 /* Check for close of control file. */ 317 if (IS_CTL_VP(vp)) { 318 MARK_INT_SAT(CODA_CLOSE_STATS); 319 return(0); 320 } 321 322 /* 323 * XXX The IS_UNMOUNTING part of this is very suspect. 324 */ 325 if (IS_UNMOUNTING(cp)) { 326 if (cp->c_ovp) { 327 #ifdef CODA_VERBOSE 328 printf("%s: destroying container %d, ufs vp %p of vp %p/cp %p\n", 329 __func__, vp->v_usecount, cp->c_ovp, vp, cp); 330 #endif 331 #ifdef hmm 332 vgone(cp->c_ovp); 333 #else 334 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 335 VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ 336 vput(cp->c_ovp); 337 #endif 338 } else { 339 #ifdef CODA_VERBOSE 340 printf("%s: NO container vp %p/cp %p\n", __func__, vp, cp); 341 #endif 342 } 343 return ENODEV; 344 } 345 346 /* Lock the container node, and VOP_CLOSE it. */ 347 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 348 VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ 349 /* 350 * Drop the lock we just obtained, and vrele the container vnode. 351 * Decrement reference counts, and clear container vnode pointer on 352 * last close. 353 */ 354 vput(cp->c_ovp); 355 if (flag & FWRITE) 356 --cp->c_owrite; 357 if (--cp->c_ocount == 0) 358 cp->c_ovp = NULL; 359 360 error = venus_close(vtomi(vp), &cp->c_fid, flag, cred, curlwp); 361 362 CODADEBUG(CODA_CLOSE, myprintf(("%s: result %d\n", __func__, error)); ) 363 return(error); 364 } 365 366 int 367 coda_read(void *v) 368 { 369 struct vop_read_args *ap = v; 370 371 ENTRY; 372 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_READ, 373 ap->a_ioflag, ap->a_cred, curlwp)); 374 } 375 376 int 377 coda_write(void *v) 378 { 379 struct vop_write_args *ap = v; 380 381 ENTRY; 382 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_WRITE, 383 ap->a_ioflag, ap->a_cred, curlwp)); 384 } 385 386 int 387 coda_rdwr(vnode_t *vp, struct uio *uiop, enum uio_rw rw, int ioflag, 388 kauth_cred_t cred, struct lwp *l) 389 { 390 /* upcall decl */ 391 /* NOTE: container file operation!!! */ 392 /* locals */ 393 struct cnode *cp = VTOC(vp); 394 vnode_t *cfvp = cp->c_ovp; 395 struct proc *p = l->l_proc; 396 int opened_internally = 0; 397 int error = 0; 398 399 MARK_ENTRY(CODA_RDWR_STATS); 400 401 CODADEBUG(CODA_RDWR, myprintf(("coda_rdwr(%d, %p, %lu, %lld)\n", rw, 402 uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, 403 (long long) uiop->uio_offset)); ) 404 405 /* Check for rdwr of control object. */ 406 if (IS_CTL_VP(vp)) { 407 MARK_INT_FAIL(CODA_RDWR_STATS); 408 return(EINVAL); 409 } 410 411 /* Redirect the request to UFS. */ 412 413 /* 414 * If file is not already open this must be a page 415 * {read,write} request. Iget the cache file's inode 416 * pointer if we still have its <device, inode> pair. 417 * Otherwise, we must do an internal open to derive the 418 * pair. 419 * XXX Integrate this into a coherent strategy for container 420 * file acquisition. 421 */ 422 if (cfvp == NULL) { 423 /* 424 * If we're dumping core, do the internal open. Otherwise 425 * venus won't have the correct size of the core when 426 * it's completely written. 427 */ 428 if (cp->c_inode != 0 && !(p && (p->p_acflag & ACORE))) { 429 #ifdef CODA_VERBOSE 430 printf("%s: grabbing container vnode, losing reference\n", 431 __func__); 432 #endif 433 /* Get locked and refed vnode. */ 434 error = coda_grab_vnode(vp, cp->c_device, cp->c_inode, &cfvp); 435 if (error) { 436 MARK_INT_FAIL(CODA_RDWR_STATS); 437 return(error); 438 } 439 /* 440 * Drop lock. 441 * XXX Where is reference released. 442 */ 443 VOP_UNLOCK(cfvp); 444 } 445 else { 446 #ifdef CODA_VERBOSE 447 printf("%s: internal VOP_OPEN\n", __func__); 448 #endif 449 opened_internally = 1; 450 MARK_INT_GEN(CODA_OPEN_STATS); 451 error = VOP_OPEN(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); 452 #ifdef CODA_VERBOSE 453 printf("%s: Internally Opening %p\n", __func__, vp); 454 #endif 455 if (error) { 456 MARK_INT_FAIL(CODA_RDWR_STATS); 457 return(error); 458 } 459 cfvp = cp->c_ovp; 460 } 461 } 462 463 /* Have UFS handle the call. */ 464 CODADEBUG(CODA_RDWR, myprintf(("%s: fid = %s, refcnt = %d\n", __func__, 465 coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount)); ) 466 467 if (rw == UIO_READ) { 468 error = VOP_READ(cfvp, uiop, ioflag, cred); 469 } else { 470 error = VOP_WRITE(cfvp, uiop, ioflag, cred); 471 } 472 473 if (error) 474 MARK_INT_FAIL(CODA_RDWR_STATS); 475 else 476 MARK_INT_SAT(CODA_RDWR_STATS); 477 478 /* Do an internal close if necessary. */ 479 if (opened_internally) { 480 MARK_INT_GEN(CODA_CLOSE_STATS); 481 (void)VOP_CLOSE(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); 482 } 483 484 /* Invalidate cached attributes if writing. */ 485 if (rw == UIO_WRITE) 486 cp->c_flags &= ~C_VATTR; 487 return(error); 488 } 489 490 int 491 coda_ioctl(void *v) 492 { 493 /* true args */ 494 struct vop_ioctl_args *ap = v; 495 vnode_t *vp = ap->a_vp; 496 int com = ap->a_command; 497 void *data = ap->a_data; 498 int flag = ap->a_fflag; 499 kauth_cred_t cred = ap->a_cred; 500 /* locals */ 501 int error; 502 vnode_t *tvp; 503 struct PioctlData *iap = (struct PioctlData *)data; 504 namei_simple_flags_t sflags; 505 506 MARK_ENTRY(CODA_IOCTL_STATS); 507 508 CODADEBUG(CODA_IOCTL, myprintf(("in coda_ioctl on %s\n", iap->path));) 509 510 /* Don't check for operation on a dying object, for ctlvp it 511 shouldn't matter */ 512 513 /* Must be control object to succeed. */ 514 if (!IS_CTL_VP(vp)) { 515 MARK_INT_FAIL(CODA_IOCTL_STATS); 516 CODADEBUG(CODA_IOCTL, myprintf(("%s error: vp != ctlvp", __func__));) 517 return (EOPNOTSUPP); 518 } 519 /* Look up the pathname. */ 520 521 /* Should we use the name cache here? It would get it from 522 lookupname sooner or later anyway, right? */ 523 524 sflags = iap->follow ? NSM_FOLLOW_NOEMULROOT : NSM_NOFOLLOW_NOEMULROOT; 525 error = namei_simple_user(iap->path, sflags, &tvp); 526 527 if (error) { 528 MARK_INT_FAIL(CODA_IOCTL_STATS); 529 CODADEBUG(CODA_IOCTL, myprintf(("%s error: lookup returns %d\n", 530 __func__, error));) 531 return(error); 532 } 533 534 /* 535 * Make sure this is a coda style cnode, but it may be a 536 * different vfsp 537 */ 538 /* XXX: this totally violates the comment about vtagtype in vnode.h */ 539 if (tvp->v_tag != VT_CODA) { 540 vrele(tvp); 541 MARK_INT_FAIL(CODA_IOCTL_STATS); 542 CODADEBUG(CODA_IOCTL, myprintf(("%s error: %s not a coda object\n", 543 __func__, iap->path));) 544 return(EINVAL); 545 } 546 547 if (iap->vi.in_size > VC_MAXDATASIZE || iap->vi.out_size > VC_MAXDATASIZE) { 548 vrele(tvp); 549 return(EINVAL); 550 } 551 error = venus_ioctl(vtomi(tvp), &((VTOC(tvp))->c_fid), com, flag, data, 552 cred, curlwp); 553 554 if (error) 555 MARK_INT_FAIL(CODA_IOCTL_STATS); 556 else 557 CODADEBUG(CODA_IOCTL, myprintf(("Ioctl returns %d \n", error)); ) 558 559 vrele(tvp); 560 return(error); 561 } 562 563 /* 564 * To reduce the cost of a user-level venus;we cache attributes in 565 * the kernel. Each cnode has storage allocated for an attribute. If 566 * c_vattr is valid, return a reference to it. Otherwise, get the 567 * attributes from venus and store them in the cnode. There is some 568 * question if this method is a security leak. But I think that in 569 * order to make this call, the user must have done a lookup and 570 * opened the file, and therefore should already have access. 571 */ 572 int 573 coda_getattr(void *v) 574 { 575 /* true args */ 576 struct vop_getattr_args *ap = v; 577 vnode_t *vp = ap->a_vp; 578 struct cnode *cp = VTOC(vp); 579 struct vattr *vap = ap->a_vap; 580 kauth_cred_t cred = ap->a_cred; 581 /* locals */ 582 int error; 583 584 MARK_ENTRY(CODA_GETATTR_STATS); 585 586 /* Check for getattr of control object. */ 587 if (IS_CTL_VP(vp)) { 588 MARK_INT_FAIL(CODA_GETATTR_STATS); 589 return(ENOENT); 590 } 591 592 /* Check to see if the attributes have already been cached */ 593 if (VALID_VATTR(cp)) { 594 CODADEBUG(CODA_GETATTR, { myprintf(("%s: attr cache hit: %s\n", 595 __func__, coda_f2s(&cp->c_fid)));}) 596 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 597 coda_print_vattr(&cp->c_vattr); ) 598 599 *vap = cp->c_vattr; 600 MARK_INT_SAT(CODA_GETATTR_STATS); 601 return(0); 602 } 603 604 error = venus_getattr(vtomi(vp), &cp->c_fid, cred, curlwp, vap); 605 606 if (!error) { 607 CODADEBUG(CODA_GETATTR, myprintf(("%s miss %s: result %d\n", 608 __func__, coda_f2s(&cp->c_fid), error)); ) 609 610 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 611 coda_print_vattr(vap); ) 612 613 /* If not open for write, store attributes in cnode */ 614 if ((cp->c_owrite == 0) && (coda_attr_cache)) { 615 cp->c_vattr = *vap; 616 cp->c_flags |= C_VATTR; 617 } 618 619 } 620 return(error); 621 } 622 623 int 624 coda_setattr(void *v) 625 { 626 /* true args */ 627 struct vop_setattr_args *ap = v; 628 vnode_t *vp = ap->a_vp; 629 struct cnode *cp = VTOC(vp); 630 struct vattr *vap = ap->a_vap; 631 kauth_cred_t cred = ap->a_cred; 632 /* locals */ 633 int error; 634 635 MARK_ENTRY(CODA_SETATTR_STATS); 636 637 /* Check for setattr of control object. */ 638 if (IS_CTL_VP(vp)) { 639 MARK_INT_FAIL(CODA_SETATTR_STATS); 640 return(ENOENT); 641 } 642 643 if (codadebug & CODADBGMSK(CODA_SETATTR)) { 644 coda_print_vattr(vap); 645 } 646 error = venus_setattr(vtomi(vp), &cp->c_fid, vap, cred, curlwp); 647 648 if (!error) 649 cp->c_flags &= ~C_VATTR; 650 651 CODADEBUG(CODA_SETATTR, myprintf(("setattr %d\n", error)); ) 652 return(error); 653 } 654 655 int 656 coda_access(void *v) 657 { 658 /* true args */ 659 struct vop_access_args *ap = v; 660 vnode_t *vp = ap->a_vp; 661 struct cnode *cp = VTOC(vp); 662 int mode = ap->a_mode; 663 kauth_cred_t cred = ap->a_cred; 664 /* locals */ 665 int error; 666 667 MARK_ENTRY(CODA_ACCESS_STATS); 668 669 /* Check for access of control object. Only read access is 670 allowed on it. */ 671 if (IS_CTL_VP(vp)) { 672 /* bogus hack - all will be marked as successes */ 673 MARK_INT_SAT(CODA_ACCESS_STATS); 674 return(((mode & VREAD) && !(mode & (VWRITE | VEXEC))) 675 ? 0 : EACCES); 676 } 677 678 /* 679 * if the file is a directory, and we are checking exec (eg lookup) 680 * access, and the file is in the namecache, then the user must have 681 * lookup access to it. 682 */ 683 if (coda_access_cache) { 684 if ((vp->v_type == VDIR) && (mode & VEXEC)) { 685 if (coda_nc_lookup(cp, ".", 1, cred)) { 686 MARK_INT_SAT(CODA_ACCESS_STATS); 687 return(0); /* it was in the cache */ 688 } 689 } 690 } 691 692 error = venus_access(vtomi(vp), &cp->c_fid, mode, cred, curlwp); 693 694 return(error); 695 } 696 697 /* 698 * CODA abort op, called after namei() when a CREATE/DELETE isn't actually 699 * done. If a buffer has been saved in anticipation of a coda_create or 700 * a coda_remove, delete it. 701 */ 702 /* ARGSUSED */ 703 int 704 coda_abortop(void *v) 705 { 706 /* true args */ 707 struct vop_abortop_args /* { 708 vnode_t *a_dvp; 709 struct componentname *a_cnp; 710 } */ *ap = v; 711 712 (void)ap; 713 /* upcall decl */ 714 /* locals */ 715 716 return (0); 717 } 718 719 int 720 coda_readlink(void *v) 721 { 722 /* true args */ 723 struct vop_readlink_args *ap = v; 724 vnode_t *vp = ap->a_vp; 725 struct cnode *cp = VTOC(vp); 726 struct uio *uiop = ap->a_uio; 727 kauth_cred_t cred = ap->a_cred; 728 /* locals */ 729 struct lwp *l = curlwp; 730 int error; 731 char *str; 732 int len; 733 734 MARK_ENTRY(CODA_READLINK_STATS); 735 736 /* Check for readlink of control object. */ 737 if (IS_CTL_VP(vp)) { 738 MARK_INT_FAIL(CODA_READLINK_STATS); 739 return(ENOENT); 740 } 741 742 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { /* symlink was cached */ 743 uiop->uio_rw = UIO_READ; 744 error = uiomove(cp->c_symlink, (int)cp->c_symlen, uiop); 745 if (error) 746 MARK_INT_FAIL(CODA_READLINK_STATS); 747 else 748 MARK_INT_SAT(CODA_READLINK_STATS); 749 return(error); 750 } 751 752 error = venus_readlink(vtomi(vp), &cp->c_fid, cred, l, &str, &len); 753 754 if (!error) { 755 uiop->uio_rw = UIO_READ; 756 error = uiomove(str, len, uiop); 757 758 if (coda_symlink_cache) { 759 cp->c_symlink = str; 760 cp->c_symlen = len; 761 cp->c_flags |= C_SYMLINK; 762 } else 763 CODA_FREE(str, len); 764 } 765 766 CODADEBUG(CODA_READLINK, myprintf(("in readlink result %d\n",error));) 767 return(error); 768 } 769 770 int 771 coda_fsync(void *v) 772 { 773 /* true args */ 774 struct vop_fsync_args *ap = v; 775 vnode_t *vp = ap->a_vp; 776 struct cnode *cp = VTOC(vp); 777 kauth_cred_t cred = ap->a_cred; 778 /* locals */ 779 vnode_t *convp = cp->c_ovp; 780 int error; 781 782 MARK_ENTRY(CODA_FSYNC_STATS); 783 784 /* Check for fsync on an unmounting object */ 785 /* The NetBSD kernel, in it's infinite wisdom, can try to fsync 786 * after an unmount has been initiated. This is a Bad Thing, 787 * which we have to avoid. Not a legitimate failure for stats. 788 */ 789 if (IS_UNMOUNTING(cp)) { 790 return(ENODEV); 791 } 792 793 /* Check for fsync of control object. */ 794 if (IS_CTL_VP(vp)) { 795 MARK_INT_SAT(CODA_FSYNC_STATS); 796 return(0); 797 } 798 799 if (convp) 800 VOP_FSYNC(convp, cred, MNT_WAIT, 0, 0); 801 802 /* 803 * We can expect fsync on any vnode at all if venus is pruging it. 804 * Venus can't very well answer the fsync request, now can it? 805 * Hopefully, it won't have to, because hopefully, venus preserves 806 * the (possibly untrue) invariant that it never purges an open 807 * vnode. Hopefully. 808 */ 809 if (cp->c_flags & C_PURGING) { 810 return(0); 811 } 812 813 error = venus_fsync(vtomi(vp), &cp->c_fid, cred, curlwp); 814 815 CODADEBUG(CODA_FSYNC, myprintf(("in fsync result %d\n",error)); ) 816 return(error); 817 } 818 819 /* 820 * vp is locked on entry, and we must unlock it. 821 * XXX This routine is suspect and probably needs rewriting. 822 */ 823 int 824 coda_inactive(void *v) 825 { 826 /* true args */ 827 struct vop_inactive_args *ap = v; 828 vnode_t *vp = ap->a_vp; 829 struct cnode *cp = VTOC(vp); 830 kauth_cred_t cred __unused = NULL; 831 832 /* We don't need to send inactive to venus - DCS */ 833 MARK_ENTRY(CODA_INACTIVE_STATS); 834 835 if (IS_CTL_VP(vp)) { 836 MARK_INT_SAT(CODA_INACTIVE_STATS); 837 return 0; 838 } 839 840 CODADEBUG(CODA_INACTIVE, myprintf(("in inactive, %s, vfsp %p\n", 841 coda_f2s(&cp->c_fid), vp->v_mount));) 842 843 /* If an array has been allocated to hold the symlink, deallocate it */ 844 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { 845 if (cp->c_symlink == NULL) 846 panic("%s: null symlink pointer in cnode", __func__); 847 848 CODA_FREE(cp->c_symlink, cp->c_symlen); 849 cp->c_flags &= ~C_SYMLINK; 850 cp->c_symlen = 0; 851 } 852 853 /* Remove it from the table so it can't be found. */ 854 coda_unsave(cp); 855 if (vp->v_mount->mnt_data == NULL) { 856 myprintf(("Help! vfsp->vfs_data was NULL, but vnode %p wasn't dying\n", vp)); 857 panic("badness in coda_inactive"); 858 } 859 860 #ifdef CODA_VERBOSE 861 /* Sanity checks that perhaps should be panic. */ 862 if (vp->v_usecount > 1) 863 printf("%s: %p usecount %d\n", __func__, vp, vp->v_usecount); 864 if (cp->c_ovp != NULL) 865 printf("%s: %p ovp != NULL\n", __func__, vp); 866 #endif 867 /* XXX Do we need to VOP_CLOSE container vnodes? */ 868 VOP_UNLOCK(vp); 869 if (!IS_UNMOUNTING(cp)) 870 *ap->a_recycle = true; 871 872 MARK_INT_SAT(CODA_INACTIVE_STATS); 873 return(0); 874 } 875 876 /* 877 * Coda does not use the normal namecache, but a private version. 878 * Consider how to use the standard facility instead. 879 */ 880 int 881 coda_lookup(void *v) 882 { 883 /* true args */ 884 struct vop_lookup_v2_args *ap = v; 885 /* (locked) vnode of dir in which to do lookup */ 886 vnode_t *dvp = ap->a_dvp; 887 struct cnode *dcp = VTOC(dvp); 888 /* output variable for result */ 889 vnode_t **vpp = ap->a_vpp; 890 /* name to lookup */ 891 struct componentname *cnp = ap->a_cnp; 892 kauth_cred_t cred = cnp->cn_cred; 893 struct lwp *l = curlwp; 894 /* locals */ 895 struct cnode *cp; 896 const char *nm = cnp->cn_nameptr; 897 int len = cnp->cn_namelen; 898 CodaFid VFid; 899 int vtype; 900 int error = 0; 901 902 MARK_ENTRY(CODA_LOOKUP_STATS); 903 904 CODADEBUG(CODA_LOOKUP, myprintf(("%s: %s in %s\n", __func__, 905 nm, coda_f2s(&dcp->c_fid)));) 906 907 /* 908 * XXX componentname flags in MODMASK are not handled at all 909 */ 910 911 /* 912 * The overall strategy is to switch on the lookup type and get a 913 * result vnode that is vref'd but not locked. 914 */ 915 916 /* Check for lookup of control object. */ 917 if (IS_CTL_NAME(dvp, nm, len)) { 918 *vpp = coda_ctlvp; 919 vref(*vpp); 920 MARK_INT_SAT(CODA_LOOKUP_STATS); 921 goto exit; 922 } 923 924 /* Avoid trying to hand venus an unreasonably long name. */ 925 if (len+1 > CODA_MAXNAMLEN) { 926 MARK_INT_FAIL(CODA_LOOKUP_STATS); 927 CODADEBUG(CODA_LOOKUP, myprintf(("%s: name too long:, %s (%s)\n", 928 __func__, coda_f2s(&dcp->c_fid), nm));) 929 *vpp = (vnode_t *)0; 930 error = EINVAL; 931 goto exit; 932 } 933 934 /* 935 * Try to resolve the lookup in the minicache. If that fails, ask 936 * venus to do the lookup. XXX The interaction between vnode 937 * locking and any locking that coda does is not clear. 938 */ 939 cp = coda_nc_lookup(dcp, nm, len, cred); 940 if (cp) { 941 *vpp = CTOV(cp); 942 vref(*vpp); 943 CODADEBUG(CODA_LOOKUP, 944 myprintf(("lookup result %d vpp %p\n",error,*vpp));) 945 } else { 946 /* The name wasn't cached, so ask Venus. */ 947 error = venus_lookup(vtomi(dvp), &dcp->c_fid, nm, len, cred, l, &VFid, 948 &vtype); 949 950 if (error) { 951 MARK_INT_FAIL(CODA_LOOKUP_STATS); 952 CODADEBUG(CODA_LOOKUP, myprintf(("%s: lookup error on %s (%s)%d\n", 953 __func__, coda_f2s(&dcp->c_fid), nm, error));) 954 *vpp = (vnode_t *)0; 955 } else { 956 MARK_INT_SAT(CODA_LOOKUP_STATS); 957 CODADEBUG(CODA_LOOKUP, myprintf(("%s: %s type %o result %d\n", 958 __func__, coda_f2s(&VFid), vtype, error)); ) 959 960 cp = make_coda_node(&VFid, dvp->v_mount, vtype); 961 *vpp = CTOV(cp); 962 /* vpp is now vrefed. */ 963 964 /* 965 * Unless this vnode is marked CODA_NOCACHE, enter it into 966 * the coda name cache to avoid a future venus round-trip. 967 * XXX Interaction with componentname NOCACHE is unclear. 968 */ 969 if (!(vtype & CODA_NOCACHE)) 970 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 971 } 972 } 973 974 exit: 975 /* 976 * If we are creating, and this was the last name to be looked up, 977 * and the error was ENOENT, then make the leaf NULL and return 978 * success. 979 * XXX Check against new lookup rules. 980 */ 981 if (((cnp->cn_nameiop == CREATE) || (cnp->cn_nameiop == RENAME)) 982 && (cnp->cn_flags & ISLASTCN) 983 && (error == ENOENT)) 984 { 985 error = EJUSTRETURN; 986 *ap->a_vpp = NULL; 987 } 988 989 return(error); 990 } 991 992 /*ARGSUSED*/ 993 int 994 coda_create(void *v) 995 { 996 /* true args */ 997 struct vop_create_v3_args *ap = v; 998 vnode_t *dvp = ap->a_dvp; 999 struct cnode *dcp = VTOC(dvp); 1000 struct vattr *va = ap->a_vap; 1001 int exclusive = 1; 1002 int mode = ap->a_vap->va_mode; 1003 vnode_t **vpp = ap->a_vpp; 1004 struct componentname *cnp = ap->a_cnp; 1005 kauth_cred_t cred = cnp->cn_cred; 1006 struct lwp *l = curlwp; 1007 /* locals */ 1008 int error; 1009 struct cnode *cp; 1010 const char *nm = cnp->cn_nameptr; 1011 int len = cnp->cn_namelen; 1012 CodaFid VFid; 1013 struct vattr attr; 1014 1015 MARK_ENTRY(CODA_CREATE_STATS); 1016 1017 /* All creates are exclusive XXX */ 1018 /* I'm assuming the 'mode' argument is the file mode bits XXX */ 1019 1020 /* Check for create of control object. */ 1021 if (IS_CTL_NAME(dvp, nm, len)) { 1022 *vpp = (vnode_t *)0; 1023 MARK_INT_FAIL(CODA_CREATE_STATS); 1024 return(EACCES); 1025 } 1026 1027 error = venus_create(vtomi(dvp), &dcp->c_fid, nm, len, exclusive, mode, va, cred, l, &VFid, &attr); 1028 1029 if (!error) { 1030 1031 /* 1032 * XXX Violation of venus/kernel invariants is a difficult case, 1033 * but venus should not be able to cause a panic. 1034 */ 1035 /* If this is an exclusive create, panic if the file already exists. */ 1036 /* Venus should have detected the file and reported EEXIST. */ 1037 1038 if ((exclusive == 1) && 1039 (coda_find(&VFid) != NULL)) 1040 panic("cnode existed for newly created file!"); 1041 1042 cp = make_coda_node(&VFid, dvp->v_mount, attr.va_type); 1043 *vpp = CTOV(cp); 1044 1045 /* XXX vnodeops doesn't say this argument can be changed. */ 1046 /* Update va to reflect the new attributes. */ 1047 (*va) = attr; 1048 1049 /* Update the attribute cache and mark it as valid */ 1050 if (coda_attr_cache) { 1051 VTOC(*vpp)->c_vattr = attr; 1052 VTOC(*vpp)->c_flags |= C_VATTR; 1053 } 1054 1055 /* Invalidate parent's attr cache (modification time has changed). */ 1056 VTOC(dvp)->c_flags &= ~C_VATTR; 1057 1058 /* enter the new vnode in the Name Cache */ 1059 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1060 1061 CODADEBUG(CODA_CREATE, myprintf(("%s: %s, result %d\n", __func__, 1062 coda_f2s(&VFid), error)); ) 1063 } else { 1064 *vpp = (vnode_t *)0; 1065 CODADEBUG(CODA_CREATE, myprintf(("%s: create error %d\n", __func__, 1066 error));) 1067 } 1068 1069 if (!error) { 1070 #ifdef CODA_VERBOSE 1071 if ((cnp->cn_flags & LOCKLEAF) == 0) 1072 /* This should not happen; flags are for lookup only. */ 1073 printf("%s: LOCKLEAF not set!\n", __func__); 1074 #endif 1075 } 1076 1077 return(error); 1078 } 1079 1080 int 1081 coda_remove(void *v) 1082 { 1083 /* true args */ 1084 struct vop_remove_args *ap = v; 1085 vnode_t *dvp = ap->a_dvp; 1086 struct cnode *cp = VTOC(dvp); 1087 vnode_t *vp = ap->a_vp; 1088 struct componentname *cnp = ap->a_cnp; 1089 kauth_cred_t cred = cnp->cn_cred; 1090 struct lwp *l = curlwp; 1091 /* locals */ 1092 int error; 1093 const char *nm = cnp->cn_nameptr; 1094 int len = cnp->cn_namelen; 1095 struct cnode *tp; 1096 1097 MARK_ENTRY(CODA_REMOVE_STATS); 1098 1099 CODADEBUG(CODA_REMOVE, myprintf(("%s: %s in %s\n", __func__, 1100 nm, coda_f2s(&cp->c_fid)));) 1101 1102 /* Remove the file's entry from the CODA Name Cache */ 1103 /* We're being conservative here, it might be that this person 1104 * doesn't really have sufficient access to delete the file 1105 * but we feel zapping the entry won't really hurt anyone -- dcs 1106 */ 1107 /* I'm gonna go out on a limb here. If a file and a hardlink to it 1108 * exist, and one is removed, the link count on the other will be 1109 * off by 1. We could either invalidate the attrs if cached, or 1110 * fix them. I'll try to fix them. DCS 11/8/94 1111 */ 1112 tp = coda_nc_lookup(VTOC(dvp), nm, len, cred); 1113 if (tp) { 1114 if (VALID_VATTR(tp)) { /* If attrs are cached */ 1115 if (tp->c_vattr.va_nlink > 1) { /* If it's a hard link */ 1116 tp->c_vattr.va_nlink--; 1117 } 1118 } 1119 1120 coda_nc_zapfile(VTOC(dvp), nm, len); 1121 /* No need to flush it if it doesn't exist! */ 1122 } 1123 /* Invalidate the parent's attr cache, the modification time has changed */ 1124 VTOC(dvp)->c_flags &= ~C_VATTR; 1125 1126 /* Check for remove of control object. */ 1127 if (IS_CTL_NAME(dvp, nm, len)) { 1128 MARK_INT_FAIL(CODA_REMOVE_STATS); 1129 return(ENOENT); 1130 } 1131 1132 error = venus_remove(vtomi(dvp), &cp->c_fid, nm, len, cred, l); 1133 1134 CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n",error)); ) 1135 1136 /* 1137 * Unlock parent and child (avoiding double if "."). 1138 */ 1139 if (dvp == vp) { 1140 vrele(vp); 1141 } else { 1142 vput(vp); 1143 } 1144 vput(dvp); 1145 1146 return(error); 1147 } 1148 1149 /* 1150 * dvp is the directory where the link is to go, and is locked. 1151 * vp is the object to be linked to, and is unlocked. 1152 * At exit, we must unlock dvp, and vput dvp. 1153 */ 1154 int 1155 coda_link(void *v) 1156 { 1157 /* true args */ 1158 struct vop_link_args *ap = v; 1159 vnode_t *vp = ap->a_vp; 1160 struct cnode *cp = VTOC(vp); 1161 vnode_t *dvp = ap->a_dvp; 1162 struct cnode *dcp = VTOC(dvp); 1163 struct componentname *cnp = ap->a_cnp; 1164 kauth_cred_t cred = cnp->cn_cred; 1165 struct lwp *l = curlwp; 1166 /* locals */ 1167 int error; 1168 const char *nm = cnp->cn_nameptr; 1169 int len = cnp->cn_namelen; 1170 1171 MARK_ENTRY(CODA_LINK_STATS); 1172 1173 if (codadebug & CODADBGMSK(CODA_LINK)) { 1174 1175 myprintf(("%s: vp fid: %s\n", __func__, coda_f2s(&cp->c_fid))); 1176 myprintf(("%s: dvp fid: %s)\n", __func__, coda_f2s(&dcp->c_fid))); 1177 1178 } 1179 if (codadebug & CODADBGMSK(CODA_LINK)) { 1180 myprintf(("%s: vp fid: %s\n", __func__, coda_f2s(&cp->c_fid))); 1181 myprintf(("%s: dvp fid: %s\n", __func__, coda_f2s(&dcp->c_fid))); 1182 1183 } 1184 1185 /* Check for link to/from control object. */ 1186 if (IS_CTL_NAME(dvp, nm, len) || IS_CTL_VP(vp)) { 1187 MARK_INT_FAIL(CODA_LINK_STATS); 1188 return(EACCES); 1189 } 1190 1191 /* If linking . to a name, error out earlier. */ 1192 if (vp == dvp) { 1193 #ifdef CODA_VERBOSE 1194 printf("%s coda_link vp==dvp\n", __func__); 1195 #endif 1196 error = EISDIR; 1197 goto exit; 1198 } 1199 1200 /* XXX Why does venus_link need the vnode to be locked?*/ 1201 if ((error = vn_lock(vp, LK_EXCLUSIVE)) != 0) { 1202 #ifdef CODA_VERBOSE 1203 printf("%s: couldn't lock vnode %p\n", __func__, vp); 1204 #endif 1205 error = EFAULT; /* XXX better value */ 1206 goto exit; 1207 } 1208 error = venus_link(vtomi(vp), &cp->c_fid, &dcp->c_fid, nm, len, cred, l); 1209 VOP_UNLOCK(vp); 1210 1211 /* Invalidate parent's attr cache (the modification time has changed). */ 1212 VTOC(dvp)->c_flags &= ~C_VATTR; 1213 /* Invalidate child's attr cache (XXX why). */ 1214 VTOC(vp)->c_flags &= ~C_VATTR; 1215 1216 CODADEBUG(CODA_LINK, myprintf(("in link result %d\n",error)); ) 1217 1218 exit: 1219 vput(dvp); 1220 return(error); 1221 } 1222 1223 int 1224 coda_rename(void *v) 1225 { 1226 /* true args */ 1227 struct vop_rename_args *ap = v; 1228 vnode_t *odvp = ap->a_fdvp; 1229 struct cnode *odcp = VTOC(odvp); 1230 struct componentname *fcnp = ap->a_fcnp; 1231 vnode_t *ndvp = ap->a_tdvp; 1232 struct cnode *ndcp = VTOC(ndvp); 1233 struct componentname *tcnp = ap->a_tcnp; 1234 kauth_cred_t cred = fcnp->cn_cred; 1235 struct lwp *l = curlwp; 1236 /* true args */ 1237 int error; 1238 const char *fnm = fcnp->cn_nameptr; 1239 int flen = fcnp->cn_namelen; 1240 const char *tnm = tcnp->cn_nameptr; 1241 int tlen = tcnp->cn_namelen; 1242 1243 MARK_ENTRY(CODA_RENAME_STATS); 1244 1245 /* Hmmm. The vnodes are already looked up. Perhaps they are locked? 1246 This could be Bad. XXX */ 1247 #ifdef OLD_DIAGNOSTIC 1248 if ((fcnp->cn_cred != tcnp->cn_cred) 1249 || (fcnp->cn_lwp != tcnp->cn_lwp)) 1250 { 1251 panic("%s: component names don't agree", __func__); 1252 } 1253 #endif 1254 1255 /* Check for rename involving control object. */ 1256 if (IS_CTL_NAME(odvp, fnm, flen) || IS_CTL_NAME(ndvp, tnm, tlen)) { 1257 MARK_INT_FAIL(CODA_RENAME_STATS); 1258 return(EACCES); 1259 } 1260 1261 /* Problem with moving directories -- need to flush entry for .. */ 1262 if (odvp != ndvp) { 1263 struct cnode *ovcp = coda_nc_lookup(VTOC(odvp), fnm, flen, cred); 1264 if (ovcp) { 1265 vnode_t *ovp = CTOV(ovcp); 1266 if ((ovp) && 1267 (ovp->v_type == VDIR)) /* If it's a directory */ 1268 coda_nc_zapfile(VTOC(ovp),"..", 2); 1269 } 1270 } 1271 1272 /* Remove the entries for both source and target files */ 1273 coda_nc_zapfile(VTOC(odvp), fnm, flen); 1274 coda_nc_zapfile(VTOC(ndvp), tnm, tlen); 1275 1276 /* Invalidate the parent's attr cache, the modification time has changed */ 1277 VTOC(odvp)->c_flags &= ~C_VATTR; 1278 VTOC(ndvp)->c_flags &= ~C_VATTR; 1279 1280 if (flen+1 > CODA_MAXNAMLEN) { 1281 MARK_INT_FAIL(CODA_RENAME_STATS); 1282 error = EINVAL; 1283 goto exit; 1284 } 1285 1286 if (tlen+1 > CODA_MAXNAMLEN) { 1287 MARK_INT_FAIL(CODA_RENAME_STATS); 1288 error = EINVAL; 1289 goto exit; 1290 } 1291 1292 error = venus_rename(vtomi(odvp), &odcp->c_fid, &ndcp->c_fid, fnm, flen, tnm, tlen, cred, l); 1293 1294 exit: 1295 CODADEBUG(CODA_RENAME, myprintf(("in rename result %d\n",error));) 1296 /* XXX - do we need to call cache pureg on the moved vnode? */ 1297 cache_purge(ap->a_fvp); 1298 1299 /* It seems to be incumbent on us to drop locks on all four vnodes */ 1300 /* From-vnodes are not locked, only ref'd. To-vnodes are locked. */ 1301 1302 vrele(ap->a_fvp); 1303 vrele(odvp); 1304 1305 if (ap->a_tvp) { 1306 if (ap->a_tvp == ndvp) { 1307 vrele(ap->a_tvp); 1308 } else { 1309 vput(ap->a_tvp); 1310 } 1311 } 1312 1313 vput(ndvp); 1314 return(error); 1315 } 1316 1317 int 1318 coda_mkdir(void *v) 1319 { 1320 /* true args */ 1321 struct vop_mkdir_v3_args *ap = v; 1322 vnode_t *dvp = ap->a_dvp; 1323 struct cnode *dcp = VTOC(dvp); 1324 struct componentname *cnp = ap->a_cnp; 1325 struct vattr *va = ap->a_vap; 1326 vnode_t **vpp = ap->a_vpp; 1327 kauth_cred_t cred = cnp->cn_cred; 1328 struct lwp *l = curlwp; 1329 /* locals */ 1330 int error; 1331 const char *nm = cnp->cn_nameptr; 1332 int len = cnp->cn_namelen; 1333 struct cnode *cp; 1334 CodaFid VFid; 1335 struct vattr ova; 1336 1337 MARK_ENTRY(CODA_MKDIR_STATS); 1338 1339 /* Check for mkdir of target object. */ 1340 if (IS_CTL_NAME(dvp, nm, len)) { 1341 *vpp = (vnode_t *)0; 1342 MARK_INT_FAIL(CODA_MKDIR_STATS); 1343 return(EACCES); 1344 } 1345 1346 if (len+1 > CODA_MAXNAMLEN) { 1347 *vpp = (vnode_t *)0; 1348 MARK_INT_FAIL(CODA_MKDIR_STATS); 1349 return(EACCES); 1350 } 1351 1352 error = venus_mkdir(vtomi(dvp), &dcp->c_fid, nm, len, va, cred, l, &VFid, &ova); 1353 1354 if (!error) { 1355 if (coda_find(&VFid) != NULL) 1356 panic("cnode existed for newly created directory!"); 1357 1358 1359 cp = make_coda_node(&VFid, dvp->v_mount, va->va_type); 1360 *vpp = CTOV(cp); 1361 1362 /* enter the new vnode in the Name Cache */ 1363 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1364 1365 /* as a side effect, enter "." and ".." for the directory */ 1366 coda_nc_enter(VTOC(*vpp), ".", 1, cred, VTOC(*vpp)); 1367 coda_nc_enter(VTOC(*vpp), "..", 2, cred, VTOC(dvp)); 1368 1369 if (coda_attr_cache) { 1370 VTOC(*vpp)->c_vattr = ova; /* update the attr cache */ 1371 VTOC(*vpp)->c_flags |= C_VATTR; /* Valid attributes in cnode */ 1372 } 1373 1374 /* Invalidate the parent's attr cache, the modification time has changed */ 1375 VTOC(dvp)->c_flags &= ~C_VATTR; 1376 1377 CODADEBUG( CODA_MKDIR, myprintf(("%s: %s result %d\n", __func__, 1378 coda_f2s(&VFid), error)); ) 1379 } else { 1380 *vpp = (vnode_t *)0; 1381 CODADEBUG(CODA_MKDIR, myprintf(("%s error %d\n", __func__, error));) 1382 } 1383 1384 return(error); 1385 } 1386 1387 int 1388 coda_rmdir(void *v) 1389 { 1390 /* true args */ 1391 struct vop_rmdir_args *ap = v; 1392 vnode_t *dvp = ap->a_dvp; 1393 struct cnode *dcp = VTOC(dvp); 1394 vnode_t *vp = ap->a_vp; 1395 struct componentname *cnp = ap->a_cnp; 1396 kauth_cred_t cred = cnp->cn_cred; 1397 struct lwp *l = curlwp; 1398 /* true args */ 1399 int error; 1400 const char *nm = cnp->cn_nameptr; 1401 int len = cnp->cn_namelen; 1402 struct cnode *cp; 1403 1404 MARK_ENTRY(CODA_RMDIR_STATS); 1405 1406 /* Check for rmdir of control object. */ 1407 if (IS_CTL_NAME(dvp, nm, len)) { 1408 MARK_INT_FAIL(CODA_RMDIR_STATS); 1409 return(ENOENT); 1410 } 1411 1412 /* Can't remove . in self. */ 1413 if (dvp == vp) { 1414 #ifdef CODA_VERBOSE 1415 printf("%s: dvp == vp\n", __func__); 1416 #endif 1417 error = EINVAL; 1418 goto exit; 1419 } 1420 1421 /* 1422 * The caller may not have adequate permissions, and the venus 1423 * operation may fail, but it doesn't hurt from a correctness 1424 * viewpoint to invalidate cache entries. 1425 * XXX Why isn't this done after the venus_rmdir call? 1426 */ 1427 /* Look up child in name cache (by name, from parent). */ 1428 cp = coda_nc_lookup(dcp, nm, len, cred); 1429 /* If found, remove all children of the child (., ..). */ 1430 if (cp) coda_nc_zapParentfid(&(cp->c_fid), NOT_DOWNCALL); 1431 1432 /* Remove child's own entry. */ 1433 coda_nc_zapfile(dcp, nm, len); 1434 1435 /* Invalidate parent's attr cache (the modification time has changed). */ 1436 dcp->c_flags &= ~C_VATTR; 1437 1438 error = venus_rmdir(vtomi(dvp), &dcp->c_fid, nm, len, cred, l); 1439 1440 CODADEBUG(CODA_RMDIR, myprintf(("in rmdir result %d\n", error)); ) 1441 1442 exit: 1443 /* vput both vnodes */ 1444 vput(dvp); 1445 if (dvp == vp) { 1446 vrele(vp); 1447 } else { 1448 vput(vp); 1449 } 1450 1451 return(error); 1452 } 1453 1454 int 1455 coda_symlink(void *v) 1456 { 1457 /* true args */ 1458 struct vop_symlink_v3_args *ap = v; 1459 vnode_t *dvp = ap->a_dvp; 1460 struct cnode *dcp = VTOC(dvp); 1461 /* a_vpp is used in place below */ 1462 struct componentname *cnp = ap->a_cnp; 1463 struct vattr *tva = ap->a_vap; 1464 char *path = ap->a_target; 1465 kauth_cred_t cred = cnp->cn_cred; 1466 struct lwp *l = curlwp; 1467 /* locals */ 1468 int error; 1469 u_long saved_cn_flags; 1470 const char *nm = cnp->cn_nameptr; 1471 int len = cnp->cn_namelen; 1472 int plen = strlen(path); 1473 1474 /* 1475 * Here's the strategy for the moment: perform the symlink, then 1476 * do a lookup to grab the resulting vnode. I know this requires 1477 * two communications with Venus for a new sybolic link, but 1478 * that's the way the ball bounces. I don't yet want to change 1479 * the way the Mach symlink works. When Mach support is 1480 * deprecated, we should change symlink so that the common case 1481 * returns the resultant vnode in a vpp argument. 1482 */ 1483 1484 MARK_ENTRY(CODA_SYMLINK_STATS); 1485 1486 /* Check for symlink of control object. */ 1487 if (IS_CTL_NAME(dvp, nm, len)) { 1488 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1489 error = EACCES; 1490 goto exit; 1491 } 1492 1493 if (plen+1 > CODA_MAXPATHLEN) { 1494 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1495 error = EINVAL; 1496 goto exit; 1497 } 1498 1499 if (len+1 > CODA_MAXNAMLEN) { 1500 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1501 error = EINVAL; 1502 goto exit; 1503 } 1504 1505 error = venus_symlink(vtomi(dvp), &dcp->c_fid, path, plen, nm, len, tva, cred, l); 1506 1507 /* Invalidate the parent's attr cache (modification time has changed). */ 1508 dcp->c_flags &= ~C_VATTR; 1509 1510 if (!error) { 1511 /* 1512 * VOP_SYMLINK is not defined to pay attention to cnp->cn_flags; 1513 * these are defined only for VOP_LOOKUP. We desire to reuse 1514 * cnp for a VOP_LOOKUP operation, and must be sure to not pass 1515 * stray flags passed to us. Such stray flags can occur because 1516 * sys_symlink makes a namei call and then reuses the 1517 * componentname structure. 1518 */ 1519 /* 1520 * XXX Arguably we should create our own componentname structure 1521 * and not reuse the one that was passed in. 1522 */ 1523 saved_cn_flags = cnp->cn_flags; 1524 cnp->cn_flags &= ~(MODMASK | OPMASK); 1525 cnp->cn_flags |= LOOKUP; 1526 error = VOP_LOOKUP(dvp, ap->a_vpp, cnp); 1527 cnp->cn_flags = saved_cn_flags; 1528 } 1529 1530 exit: 1531 CODADEBUG(CODA_SYMLINK, myprintf(("in symlink result %d\n",error)); ) 1532 return(error); 1533 } 1534 1535 /* 1536 * Read directory entries. 1537 */ 1538 int 1539 coda_readdir(void *v) 1540 { 1541 /* true args */ 1542 struct vop_readdir_args *ap = v; 1543 vnode_t *vp = ap->a_vp; 1544 struct cnode *cp = VTOC(vp); 1545 struct uio *uiop = ap->a_uio; 1546 kauth_cred_t cred = ap->a_cred; 1547 int *eofflag = ap->a_eofflag; 1548 off_t **cookies = ap->a_cookies; 1549 int *ncookies = ap->a_ncookies; 1550 /* upcall decl */ 1551 /* locals */ 1552 int error = 0; 1553 1554 MARK_ENTRY(CODA_READDIR_STATS); 1555 1556 CODADEBUG(CODA_READDIR, myprintf(("%s: (%p, %lu, %lld)\n", __func__, 1557 uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, 1558 (long long) uiop->uio_offset)); ) 1559 1560 /* Check for readdir of control object. */ 1561 if (IS_CTL_VP(vp)) { 1562 MARK_INT_FAIL(CODA_READDIR_STATS); 1563 return(ENOENT); 1564 } 1565 1566 { 1567 /* Redirect the request to UFS. */ 1568 1569 /* If directory is not already open do an "internal open" on it. */ 1570 int opened_internally = 0; 1571 if (cp->c_ovp == NULL) { 1572 opened_internally = 1; 1573 MARK_INT_GEN(CODA_OPEN_STATS); 1574 error = VOP_OPEN(vp, FREAD, cred); 1575 #ifdef CODA_VERBOSE 1576 printf("%s: Internally Opening %p\n", __func__, vp); 1577 #endif 1578 if (error) return(error); 1579 } else 1580 vp = cp->c_ovp; 1581 1582 /* Have UFS handle the call. */ 1583 CODADEBUG(CODA_READDIR, myprintf(("%s: fid = %s, refcnt = %d\n", 1584 __func__, coda_f2s(&cp->c_fid), vp->v_usecount)); ) 1585 error = VOP_READDIR(vp, uiop, cred, eofflag, cookies, ncookies); 1586 if (error) 1587 MARK_INT_FAIL(CODA_READDIR_STATS); 1588 else 1589 MARK_INT_SAT(CODA_READDIR_STATS); 1590 1591 /* Do an "internal close" if necessary. */ 1592 if (opened_internally) { 1593 MARK_INT_GEN(CODA_CLOSE_STATS); 1594 (void)VOP_CLOSE(vp, FREAD, cred); 1595 } 1596 } 1597 1598 return(error); 1599 } 1600 1601 /* 1602 * Convert from file system blocks to device blocks 1603 */ 1604 int 1605 coda_bmap(void *v) 1606 { 1607 /* XXX on the global proc */ 1608 /* true args */ 1609 struct vop_bmap_args *ap = v; 1610 vnode_t *vp __unused = ap->a_vp; /* file's vnode */ 1611 daddr_t bn __unused = ap->a_bn; /* fs block number */ 1612 vnode_t **vpp = ap->a_vpp; /* RETURN vp of device */ 1613 daddr_t *bnp __unused = ap->a_bnp; /* RETURN device block number */ 1614 struct lwp *l __unused = curlwp; 1615 /* upcall decl */ 1616 /* locals */ 1617 1618 *vpp = (vnode_t *)0; 1619 myprintf(("coda_bmap called!\n")); 1620 return(EINVAL); 1621 } 1622 1623 /* 1624 * I don't think the following two things are used anywhere, so I've 1625 * commented them out 1626 * 1627 * struct buf *async_bufhead; 1628 * int async_daemon_count; 1629 */ 1630 int 1631 coda_strategy(void *v) 1632 { 1633 /* true args */ 1634 struct vop_strategy_args *ap = v; 1635 struct buf *bp __unused = ap->a_bp; 1636 struct lwp *l __unused = curlwp; 1637 /* upcall decl */ 1638 /* locals */ 1639 1640 myprintf(("coda_strategy called! ")); 1641 return(EINVAL); 1642 } 1643 1644 int 1645 coda_reclaim(void *v) 1646 { 1647 /* true args */ 1648 struct vop_reclaim_args *ap = v; 1649 vnode_t *vp = ap->a_vp; 1650 struct cnode *cp = VTOC(vp); 1651 /* upcall decl */ 1652 /* locals */ 1653 1654 /* 1655 * Forced unmount/flush will let vnodes with non zero use be destroyed! 1656 */ 1657 ENTRY; 1658 1659 if (IS_UNMOUNTING(cp)) { 1660 #ifdef DEBUG 1661 if (VTOC(vp)->c_ovp) { 1662 if (IS_UNMOUNTING(cp)) 1663 printf("%s: c_ovp not void: vp %p, cp %p\n", __func__, vp, cp); 1664 } 1665 #endif 1666 } else { 1667 #ifdef OLD_DIAGNOSTIC 1668 if (vp->v_usecount != 0) 1669 print("%s: pushing active %p\n", __func__, vp); 1670 if (VTOC(vp)->c_ovp) { 1671 panic("%s: c_ovp not void", __func__); 1672 } 1673 #endif 1674 } 1675 coda_free(VTOC(vp)); 1676 SET_VTOC(vp) = NULL; 1677 return (0); 1678 } 1679 1680 int 1681 coda_lock(void *v) 1682 { 1683 /* true args */ 1684 struct vop_lock_args *ap = v; 1685 vnode_t *vp = ap->a_vp; 1686 struct cnode *cp = VTOC(vp); 1687 /* upcall decl */ 1688 /* locals */ 1689 1690 ENTRY; 1691 1692 if (coda_lockdebug) { 1693 myprintf(("Attempting lock on %s\n", 1694 coda_f2s(&cp->c_fid))); 1695 } 1696 1697 return genfs_lock(v); 1698 } 1699 1700 int 1701 coda_unlock(void *v) 1702 { 1703 /* true args */ 1704 struct vop_unlock_args *ap = v; 1705 vnode_t *vp = ap->a_vp; 1706 struct cnode *cp = VTOC(vp); 1707 /* upcall decl */ 1708 /* locals */ 1709 1710 ENTRY; 1711 if (coda_lockdebug) { 1712 myprintf(("Attempting unlock on %s\n", 1713 coda_f2s(&cp->c_fid))); 1714 } 1715 1716 return genfs_unlock(v); 1717 } 1718 1719 int 1720 coda_islocked(void *v) 1721 { 1722 /* true args */ 1723 ENTRY; 1724 1725 return genfs_islocked(v); 1726 } 1727 1728 /* 1729 * Given a device and inode, obtain a locked vnode. One reference is 1730 * obtained and passed back to the caller. 1731 */ 1732 int 1733 coda_grab_vnode(vnode_t *uvp, dev_t dev, ino_t ino, vnode_t **vpp) 1734 { 1735 int error; 1736 struct mount *mp; 1737 1738 /* Obtain mount point structure from device. */ 1739 if (!(mp = devtomp(dev))) { 1740 myprintf(("%s: devtomp(0x%llx) returns NULL\n", __func__, 1741 (unsigned long long)dev)); 1742 return(ENXIO); 1743 } 1744 1745 /* 1746 * Obtain vnode from mount point and inode. 1747 */ 1748 error = VFS_VGET(mp, ino, vpp); 1749 if (error) { 1750 myprintf(("%s: iget/vget(0x%llx, %llu) returns %p, err %d\n", __func__, 1751 (unsigned long long)dev, (unsigned long long)ino, *vpp, error)); 1752 return(ENOENT); 1753 } 1754 /* share the underlying vnode lock with the coda vnode */ 1755 mutex_obj_hold((*vpp)->v_interlock); 1756 uvm_obj_setlock(&uvp->v_uobj, (*vpp)->v_interlock); 1757 KASSERT(VOP_ISLOCKED(*vpp)); 1758 return(0); 1759 } 1760 1761 static void 1762 coda_print_vattr(struct vattr *attr) 1763 { 1764 const char *typestr; 1765 1766 switch (attr->va_type) { 1767 case VNON: 1768 typestr = "VNON"; 1769 break; 1770 case VREG: 1771 typestr = "VREG"; 1772 break; 1773 case VDIR: 1774 typestr = "VDIR"; 1775 break; 1776 case VBLK: 1777 typestr = "VBLK"; 1778 break; 1779 case VCHR: 1780 typestr = "VCHR"; 1781 break; 1782 case VLNK: 1783 typestr = "VLNK"; 1784 break; 1785 case VSOCK: 1786 typestr = "VSCK"; 1787 break; 1788 case VFIFO: 1789 typestr = "VFFO"; 1790 break; 1791 case VBAD: 1792 typestr = "VBAD"; 1793 break; 1794 default: 1795 typestr = "????"; 1796 break; 1797 } 1798 1799 1800 myprintf(("attr: type %s mode %d uid %d gid %d fsid %d rdev %d\n", 1801 typestr, (int)attr->va_mode, (int)attr->va_uid, 1802 (int)attr->va_gid, (int)attr->va_fsid, (int)attr->va_rdev)); 1803 1804 myprintf((" fileid %d nlink %d size %d blocksize %d bytes %d\n", 1805 (int)attr->va_fileid, (int)attr->va_nlink, 1806 (int)attr->va_size, 1807 (int)attr->va_blocksize,(int)attr->va_bytes)); 1808 myprintf((" gen %ld flags %ld vaflags %d\n", 1809 attr->va_gen, attr->va_flags, attr->va_vaflags)); 1810 myprintf((" atime sec %d nsec %d\n", 1811 (int)attr->va_atime.tv_sec, (int)attr->va_atime.tv_nsec)); 1812 myprintf((" mtime sec %d nsec %d\n", 1813 (int)attr->va_mtime.tv_sec, (int)attr->va_mtime.tv_nsec)); 1814 myprintf((" ctime sec %d nsec %d\n", 1815 (int)attr->va_ctime.tv_sec, (int)attr->va_ctime.tv_nsec)); 1816 } 1817 1818 /* 1819 * Return a vnode for the given fid. 1820 * If no cnode exists for this fid create one and put it 1821 * in a table hashed by coda_f2i(). If the cnode for 1822 * this fid is already in the table return it (ref count is 1823 * incremented by coda_find. The cnode will be flushed from the 1824 * table when coda_inactive calls coda_unsave. 1825 */ 1826 struct cnode * 1827 make_coda_node(CodaFid *fid, struct mount *fvsp, short type) 1828 { 1829 struct cnode *cp; 1830 int error; 1831 1832 if ((cp = coda_find(fid)) == NULL) { 1833 vnode_t *vp; 1834 1835 cp = coda_alloc(); 1836 cp->c_fid = *fid; 1837 1838 error = getnewvnode(VT_CODA, fvsp, coda_vnodeop_p, NULL, &vp); 1839 if (error) { 1840 panic("%s: getnewvnode returned error %d", __func__, error); 1841 } 1842 vp->v_data = cp; 1843 vp->v_type = type; 1844 cp->c_vnode = vp; 1845 uvm_vnp_setsize(vp, 0); 1846 coda_save(cp); 1847 1848 } else { 1849 vref(CTOV(cp)); 1850 } 1851 1852 return cp; 1853 } 1854 1855 /* 1856 * coda_getpages may be called on a vnode which has not been opened, 1857 * e.g. to fault in pages to execute a program. In that case, we must 1858 * open the file to get the container. The vnode may or may not be 1859 * locked, and we must leave it in the same state. 1860 */ 1861 int 1862 coda_getpages(void *v) 1863 { 1864 struct vop_getpages_args /* { 1865 vnode_t *a_vp; 1866 voff_t a_offset; 1867 struct vm_page **a_m; 1868 int *a_count; 1869 int a_centeridx; 1870 vm_prot_t a_access_type; 1871 int a_advice; 1872 int a_flags; 1873 } */ *ap = v; 1874 vnode_t *vp = ap->a_vp, *cvp; 1875 struct cnode *cp = VTOC(vp); 1876 struct lwp *l = curlwp; 1877 kauth_cred_t cred = l->l_cred; 1878 int error, cerror; 1879 int waslocked; /* 1 if vnode lock was held on entry */ 1880 int didopen = 0; /* 1 if we opened container file */ 1881 1882 /* 1883 * Handle a case that uvm_fault doesn't quite use yet. 1884 * See layer_vnops.c. for inspiration. 1885 */ 1886 if (ap->a_flags & PGO_LOCKED) { 1887 return EBUSY; 1888 } 1889 1890 KASSERT(mutex_owned(vp->v_interlock)); 1891 1892 /* Check for control object. */ 1893 if (IS_CTL_VP(vp)) { 1894 #ifdef CODA_VERBOSE 1895 printf("%s: control object %p\n", __func__, vp); 1896 #endif 1897 return(EINVAL); 1898 } 1899 1900 /* 1901 * XXX It's really not ok to be releasing the lock we get, 1902 * because we could be overlapping with another call to 1903 * getpages and drop a lock they are relying on. We need to 1904 * figure out whether getpages ever is called holding the 1905 * lock, and if we should serialize getpages calls by some 1906 * mechanism. 1907 */ 1908 /* XXX VOP_ISLOCKED() may not be used for lock decisions. */ 1909 waslocked = VOP_ISLOCKED(vp); 1910 1911 /* Get container file if not already present. */ 1912 cvp = cp->c_ovp; 1913 if (cvp == NULL) { 1914 /* 1915 * VOP_OPEN requires a locked vnode. We must avoid 1916 * locking the vnode if it is already locked, and 1917 * leave it in the same state on exit. 1918 */ 1919 if (waslocked == 0) { 1920 mutex_exit(vp->v_interlock); 1921 cerror = vn_lock(vp, LK_EXCLUSIVE); 1922 if (cerror) { 1923 #ifdef CODA_VERBOSE 1924 printf("%s: can't lock vnode %p\n", 1925 __func__, vp); 1926 #endif 1927 return cerror; 1928 } 1929 #ifdef CODA_VERBOSE 1930 printf("%s: locked vnode %p\n", __func__, vp); 1931 #endif 1932 } 1933 1934 /* 1935 * Open file (causes upcall to venus). 1936 * XXX Perhaps we should not fully open the file, but 1937 * simply obtain a container file. 1938 */ 1939 /* XXX Is it ok to do this while holding the mutex? */ 1940 cerror = VOP_OPEN(vp, FREAD, cred); 1941 1942 if (cerror) { 1943 #ifdef CODA_VERBOSE 1944 printf("%s: cannot open vnode %p => %d\n", __func__, 1945 vp, cerror); 1946 #endif 1947 if (waslocked == 0) 1948 VOP_UNLOCK(vp); 1949 return cerror; 1950 } 1951 1952 #ifdef CODA_VERBOSE 1953 printf("%s: opened vnode %p\n", __func__, vp); 1954 #endif 1955 cvp = cp->c_ovp; 1956 didopen = 1; 1957 if (waslocked == 0) 1958 mutex_enter(vp->v_interlock); 1959 } 1960 KASSERT(cvp != NULL); 1961 1962 /* Munge the arg structure to refer to the container vnode. */ 1963 KASSERT(cvp->v_interlock == vp->v_interlock); 1964 ap->a_vp = cp->c_ovp; 1965 1966 /* Finally, call getpages on it. */ 1967 error = VCALL(ap->a_vp, VOFFSET(vop_getpages), ap); 1968 1969 /* If we opened the vnode, we must close it. */ 1970 if (didopen) { 1971 /* 1972 * VOP_CLOSE requires a locked vnode, but we are still 1973 * holding the lock (or riding a caller's lock). 1974 */ 1975 cerror = VOP_CLOSE(vp, FREAD, cred); 1976 #ifdef CODA_VERBOSE 1977 if (cerror != 0) 1978 /* XXX How should we handle this? */ 1979 printf("%s: closed vnode %p -> %d\n", __func__, 1980 vp, cerror); 1981 #endif 1982 1983 /* If we obtained a lock, drop it. */ 1984 if (waslocked == 0) 1985 VOP_UNLOCK(vp); 1986 } 1987 1988 return error; 1989 } 1990 1991 /* 1992 * The protocol requires v_interlock to be held by the caller. 1993 */ 1994 int 1995 coda_putpages(void *v) 1996 { 1997 struct vop_putpages_args /* { 1998 vnode_t *a_vp; 1999 voff_t a_offlo; 2000 voff_t a_offhi; 2001 int a_flags; 2002 } */ *ap = v; 2003 vnode_t *vp = ap->a_vp, *cvp; 2004 struct cnode *cp = VTOC(vp); 2005 int error; 2006 2007 KASSERT(mutex_owned(vp->v_interlock)); 2008 2009 /* Check for control object. */ 2010 if (IS_CTL_VP(vp)) { 2011 mutex_exit(vp->v_interlock); 2012 #ifdef CODA_VERBOSE 2013 printf("%s: control object %p\n", __func__, vp); 2014 #endif 2015 return(EINVAL); 2016 } 2017 2018 /* 2019 * If container object is not present, then there are no pages 2020 * to put; just return without error. This happens all the 2021 * time, apparently during discard of a closed vnode (which 2022 * trivially can't have dirty pages). 2023 */ 2024 cvp = cp->c_ovp; 2025 if (cvp == NULL) { 2026 mutex_exit(vp->v_interlock); 2027 return 0; 2028 } 2029 2030 /* Munge the arg structure to refer to the container vnode. */ 2031 KASSERT(cvp->v_interlock == vp->v_interlock); 2032 ap->a_vp = cvp; 2033 2034 /* Finally, call putpages on it. */ 2035 error = VCALL(ap->a_vp, VOFFSET(vop_putpages), ap); 2036 2037 return error; 2038 } 2039
Indexes created Fri Oct 17 23:09:53 GMT 2025