coda_vnops.c revision 1.98.2.1
1 /* $NetBSD: coda_vnops.c,v 1.98.2.1 2015/04/06 15:18:05 skrll 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 1.98.2.1 2015/04/06 15:18:05 skrll 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 #include <miscfs/specfs/specdev.h> 68 69 #include <coda/coda.h> 70 #include <coda/cnode.h> 71 #include <coda/coda_vnops.h> 72 #include <coda/coda_venus.h> 73 #include <coda/coda_opstats.h> 74 #include <coda/coda_subr.h> 75 #include <coda/coda_namecache.h> 76 #include <coda/coda_pioctl.h> 77 78 /* 79 * These flags select various performance enhancements. 80 */ 81 int coda_attr_cache = 1; /* Set to cache attributes in the kernel */ 82 int coda_symlink_cache = 1; /* Set to cache symbolic link information */ 83 int coda_access_cache = 1; /* Set to handle some access checks directly */ 84 85 /* structure to keep track of vfs calls */ 86 87 struct coda_op_stats coda_vnodeopstats[CODA_VNODEOPS_SIZE]; 88 89 #define MARK_ENTRY(op) (coda_vnodeopstats[op].entries++) 90 #define MARK_INT_SAT(op) (coda_vnodeopstats[op].sat_intrn++) 91 #define MARK_INT_FAIL(op) (coda_vnodeopstats[op].unsat_intrn++) 92 #define MARK_INT_GEN(op) (coda_vnodeopstats[op].gen_intrn++) 93 94 /* What we are delaying for in printf */ 95 static int coda_lockdebug = 0; 96 97 #define ENTRY if(coda_vnop_print_entry) myprintf(("Entered %s\n",__func__)) 98 99 /* Definition of the vnode operation vector */ 100 101 const struct vnodeopv_entry_desc coda_vnodeop_entries[] = { 102 { &vop_default_desc, coda_vop_error }, 103 { &vop_lookup_desc, coda_lookup }, /* lookup */ 104 { &vop_create_desc, coda_create }, /* create */ 105 { &vop_mknod_desc, coda_vop_error }, /* mknod */ 106 { &vop_open_desc, coda_open }, /* open */ 107 { &vop_close_desc, coda_close }, /* close */ 108 { &vop_access_desc, coda_access }, /* access */ 109 { &vop_getattr_desc, coda_getattr }, /* getattr */ 110 { &vop_setattr_desc, coda_setattr }, /* setattr */ 111 { &vop_read_desc, coda_read }, /* read */ 112 { &vop_write_desc, coda_write }, /* write */ 113 { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ 114 { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ 115 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 116 { &vop_ioctl_desc, coda_ioctl }, /* ioctl */ 117 { &vop_mmap_desc, genfs_mmap }, /* mmap */ 118 { &vop_fsync_desc, coda_fsync }, /* fsync */ 119 { &vop_remove_desc, coda_remove }, /* remove */ 120 { &vop_link_desc, coda_link }, /* link */ 121 { &vop_rename_desc, coda_rename }, /* rename */ 122 { &vop_mkdir_desc, coda_mkdir }, /* mkdir */ 123 { &vop_rmdir_desc, coda_rmdir }, /* rmdir */ 124 { &vop_symlink_desc, coda_symlink }, /* symlink */ 125 { &vop_readdir_desc, coda_readdir }, /* readdir */ 126 { &vop_readlink_desc, coda_readlink }, /* readlink */ 127 { &vop_abortop_desc, coda_abortop }, /* abortop */ 128 { &vop_inactive_desc, coda_inactive }, /* inactive */ 129 { &vop_reclaim_desc, coda_reclaim }, /* reclaim */ 130 { &vop_lock_desc, coda_lock }, /* lock */ 131 { &vop_unlock_desc, coda_unlock }, /* unlock */ 132 { &vop_bmap_desc, coda_bmap }, /* bmap */ 133 { &vop_strategy_desc, coda_strategy }, /* strategy */ 134 { &vop_print_desc, coda_vop_error }, /* print */ 135 { &vop_islocked_desc, coda_islocked }, /* islocked */ 136 { &vop_pathconf_desc, coda_vop_error }, /* pathconf */ 137 { &vop_advlock_desc, coda_vop_nop }, /* advlock */ 138 { &vop_bwrite_desc, coda_vop_error }, /* bwrite */ 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 static void coda_print_vattr(struct vattr *); 147 148 int (**coda_vnodeop_p)(void *); 149 const struct vnodeopv_desc coda_vnodeop_opv_desc = 150 { &coda_vnodeop_p, coda_vnodeop_entries }; 151 152 /* Definitions of NetBSD vnodeop interfaces */ 153 154 /* 155 * A generic error routine. Return EIO without looking at arguments. 156 */ 157 int 158 coda_vop_error(void *anon) { 159 struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; 160 161 if (codadebug) { 162 myprintf(("%s: Vnode operation %s called (error).\n", 163 __func__, (*desc)->vdesc_name)); 164 } 165 166 return EIO; 167 } 168 169 /* A generic do-nothing. */ 170 int 171 coda_vop_nop(void *anon) { 172 struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; 173 174 if (codadebug) { 175 myprintf(("Vnode operation %s called, but unsupported\n", 176 (*desc)->vdesc_name)); 177 } 178 return (0); 179 } 180 181 int 182 coda_vnodeopstats_init(void) 183 { 184 int i; 185 186 for(i=0;i<CODA_VNODEOPS_SIZE;i++) { 187 coda_vnodeopstats[i].opcode = i; 188 coda_vnodeopstats[i].entries = 0; 189 coda_vnodeopstats[i].sat_intrn = 0; 190 coda_vnodeopstats[i].unsat_intrn = 0; 191 coda_vnodeopstats[i].gen_intrn = 0; 192 } 193 194 return 0; 195 } 196 197 /* 198 * XXX The entire relationship between VOP_OPEN and having a container 199 * file (via venus_open) needs to be reexamined. In particular, it's 200 * valid to open/mmap/close and then reference. Instead of doing 201 * VOP_OPEN when getpages needs a container, we should do the 202 * venus_open part, and record that the vnode has opened the container 203 * for getpages, and do the matching logical close on coda_inactive. 204 * Further, coda_rdwr needs a container file, and sometimes needs to 205 * do the equivalent of open (core dumps). 206 */ 207 /* 208 * coda_open calls Venus to return the device and inode of the 209 * container file, and then obtains a vnode for that file. The 210 * container vnode is stored in the coda vnode, and a reference is 211 * added for each open file. 212 */ 213 int 214 coda_open(void *v) 215 { 216 /* 217 * NetBSD can pass the O_EXCL flag in mode, even though the check 218 * has already happened. Venus defensively assumes that if open 219 * is passed the EXCL, it must be a bug. We strip the flag here. 220 */ 221 /* true args */ 222 struct vop_open_args *ap = v; 223 vnode_t *vp = ap->a_vp; 224 struct cnode *cp = VTOC(vp); 225 int flag = ap->a_mode & (~O_EXCL); 226 kauth_cred_t cred = ap->a_cred; 227 /* locals */ 228 int error; 229 dev_t dev; /* container file device, inode, vnode */ 230 ino_t inode; 231 vnode_t *container_vp; 232 233 MARK_ENTRY(CODA_OPEN_STATS); 234 235 KASSERT(VOP_ISLOCKED(vp)); 236 /* Check for open of control file. */ 237 if (IS_CTL_VP(vp)) { 238 /* if (WRITABLE(flag)) */ 239 if (flag & (FWRITE | O_TRUNC | O_CREAT | O_EXCL)) { 240 MARK_INT_FAIL(CODA_OPEN_STATS); 241 return(EACCES); 242 } 243 MARK_INT_SAT(CODA_OPEN_STATS); 244 return(0); 245 } 246 247 error = venus_open(vtomi(vp), &cp->c_fid, flag, cred, curlwp, &dev, &inode); 248 if (error) 249 return (error); 250 if (!error) { 251 CODADEBUG(CODA_OPEN, myprintf(( 252 "%s: dev 0x%llx inode %llu result %d\n", __func__, 253 (unsigned long long)dev, (unsigned long long)inode, error));) 254 } 255 256 /* 257 * Obtain locked and referenced container vnode from container 258 * device/inode. 259 */ 260 error = coda_grab_vnode(vp, dev, inode, &container_vp); 261 if (error) 262 return (error); 263 264 /* Save the vnode pointer for the container file. */ 265 if (cp->c_ovp == NULL) { 266 cp->c_ovp = container_vp; 267 } else { 268 if (cp->c_ovp != container_vp) 269 /* 270 * Perhaps venus returned a different container, or 271 * something else went wrong. 272 */ 273 panic("%s: cp->c_ovp != container_vp", __func__); 274 } 275 cp->c_ocount++; 276 277 /* Flush the attribute cache if writing the file. */ 278 if (flag & FWRITE) { 279 cp->c_owrite++; 280 cp->c_flags &= ~C_VATTR; 281 } 282 283 /* 284 * Save the <device, inode> pair for the container file to speed 285 * up subsequent reads while closed (mmap, program execution). 286 * This is perhaps safe because venus will invalidate the node 287 * before changing the container file mapping. 288 */ 289 cp->c_device = dev; 290 cp->c_inode = inode; 291 292 /* Open the container file. */ 293 error = VOP_OPEN(container_vp, flag, cred); 294 /* 295 * Drop the lock on the container, after we have done VOP_OPEN 296 * (which requires a locked vnode). 297 */ 298 VOP_UNLOCK(container_vp); 299 return(error); 300 } 301 302 /* 303 * Close the cache file used for I/O and notify Venus. 304 */ 305 int 306 coda_close(void *v) 307 { 308 /* true args */ 309 struct vop_close_args *ap = v; 310 vnode_t *vp = ap->a_vp; 311 struct cnode *cp = VTOC(vp); 312 int flag = ap->a_fflag; 313 kauth_cred_t cred = ap->a_cred; 314 /* locals */ 315 int error; 316 317 MARK_ENTRY(CODA_CLOSE_STATS); 318 319 /* Check for close of control file. */ 320 if (IS_CTL_VP(vp)) { 321 MARK_INT_SAT(CODA_CLOSE_STATS); 322 return(0); 323 } 324 325 /* 326 * XXX The IS_UNMOUNTING part of this is very suspect. 327 */ 328 if (IS_UNMOUNTING(cp)) { 329 if (cp->c_ovp) { 330 #ifdef CODA_VERBOSE 331 printf("%s: destroying container %d, ufs vp %p of vp %p/cp %p\n", 332 __func__, vp->v_usecount, cp->c_ovp, vp, cp); 333 #endif 334 #ifdef hmm 335 vgone(cp->c_ovp); 336 #else 337 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 338 VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ 339 vput(cp->c_ovp); 340 #endif 341 } else { 342 #ifdef CODA_VERBOSE 343 printf("%s: NO container vp %p/cp %p\n", __func__, vp, cp); 344 #endif 345 } 346 return ENODEV; 347 } 348 349 /* Lock the container node, and VOP_CLOSE it. */ 350 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 351 VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ 352 /* 353 * Drop the lock we just obtained, and vrele the container vnode. 354 * Decrement reference counts, and clear container vnode pointer on 355 * last close. 356 */ 357 vput(cp->c_ovp); 358 if (flag & FWRITE) 359 --cp->c_owrite; 360 if (--cp->c_ocount == 0) 361 cp->c_ovp = NULL; 362 363 error = venus_close(vtomi(vp), &cp->c_fid, flag, cred, curlwp); 364 365 CODADEBUG(CODA_CLOSE, myprintf(("%s: result %d\n", __func__, error)); ) 366 return(error); 367 } 368 369 int 370 coda_read(void *v) 371 { 372 struct vop_read_args *ap = v; 373 374 ENTRY; 375 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_READ, 376 ap->a_ioflag, ap->a_cred, curlwp)); 377 } 378 379 int 380 coda_write(void *v) 381 { 382 struct vop_write_args *ap = v; 383 384 ENTRY; 385 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_WRITE, 386 ap->a_ioflag, ap->a_cred, curlwp)); 387 } 388 389 int 390 coda_rdwr(vnode_t *vp, struct uio *uiop, enum uio_rw rw, int ioflag, 391 kauth_cred_t cred, struct lwp *l) 392 { 393 /* upcall decl */ 394 /* NOTE: container file operation!!! */ 395 /* locals */ 396 struct cnode *cp = VTOC(vp); 397 vnode_t *cfvp = cp->c_ovp; 398 struct proc *p = l->l_proc; 399 int opened_internally = 0; 400 int error = 0; 401 402 MARK_ENTRY(CODA_RDWR_STATS); 403 404 CODADEBUG(CODA_RDWR, myprintf(("coda_rdwr(%d, %p, %lu, %lld)\n", rw, 405 uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, 406 (long long) uiop->uio_offset)); ) 407 408 /* Check for rdwr of control object. */ 409 if (IS_CTL_VP(vp)) { 410 MARK_INT_FAIL(CODA_RDWR_STATS); 411 return(EINVAL); 412 } 413 414 /* Redirect the request to UFS. */ 415 416 /* 417 * If file is not already open this must be a page 418 * {read,write} request. Iget the cache file's inode 419 * pointer if we still have its <device, inode> pair. 420 * Otherwise, we must do an internal open to derive the 421 * pair. 422 * XXX Integrate this into a coherent strategy for container 423 * file acquisition. 424 */ 425 if (cfvp == NULL) { 426 /* 427 * If we're dumping core, do the internal open. Otherwise 428 * venus won't have the correct size of the core when 429 * it's completely written. 430 */ 431 if (cp->c_inode != 0 && !(p && (p->p_acflag & ACORE))) { 432 #ifdef CODA_VERBOSE 433 printf("%s: grabbing container vnode, losing reference\n", 434 __func__); 435 #endif 436 /* Get locked and refed vnode. */ 437 error = coda_grab_vnode(vp, 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); 447 } 448 else { 449 #ifdef CODA_VERBOSE 450 printf("%s: internal VOP_OPEN\n", __func__); 451 #endif 452 opened_internally = 1; 453 MARK_INT_GEN(CODA_OPEN_STATS); 454 error = VOP_OPEN(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); 455 #ifdef CODA_VERBOSE 456 printf("%s: Internally Opening %p\n", __func__, vp); 457 #endif 458 if (error) { 459 MARK_INT_FAIL(CODA_RDWR_STATS); 460 return(error); 461 } 462 cfvp = cp->c_ovp; 463 } 464 } 465 466 /* Have UFS handle the call. */ 467 CODADEBUG(CODA_RDWR, myprintf(("%s: fid = %s, refcnt = %d\n", __func__, 468 coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount)); ) 469 470 if (rw == UIO_READ) { 471 error = VOP_READ(cfvp, uiop, ioflag, cred); 472 } else { 473 error = VOP_WRITE(cfvp, uiop, ioflag, cred); 474 } 475 476 if (error) 477 MARK_INT_FAIL(CODA_RDWR_STATS); 478 else 479 MARK_INT_SAT(CODA_RDWR_STATS); 480 481 /* Do an internal close if necessary. */ 482 if (opened_internally) { 483 MARK_INT_GEN(CODA_CLOSE_STATS); 484 (void)VOP_CLOSE(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); 485 } 486 487 /* Invalidate cached attributes if writing. */ 488 if (rw == UIO_WRITE) 489 cp->c_flags &= ~C_VATTR; 490 return(error); 491 } 492 493 int 494 coda_ioctl(void *v) 495 { 496 /* true args */ 497 struct vop_ioctl_args *ap = v; 498 vnode_t *vp = ap->a_vp; 499 int com = ap->a_command; 500 void *data = ap->a_data; 501 int flag = ap->a_fflag; 502 kauth_cred_t cred = ap->a_cred; 503 /* locals */ 504 int error; 505 vnode_t *tvp; 506 struct PioctlData *iap = (struct PioctlData *)data; 507 namei_simple_flags_t sflags; 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(("%s error: vp != ctlvp", __func__));) 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 sflags = iap->follow ? NSM_FOLLOW_NOEMULROOT : NSM_NOFOLLOW_NOEMULROOT; 528 error = namei_simple_user(iap->path, sflags, &tvp); 529 530 if (error) { 531 MARK_INT_FAIL(CODA_IOCTL_STATS); 532 CODADEBUG(CODA_IOCTL, myprintf(("%s error: lookup returns %d\n", 533 __func__, error));) 534 return(error); 535 } 536 537 /* 538 * Make sure this is a coda style cnode, but it may be a 539 * different vfsp 540 */ 541 /* XXX: this totally violates the comment about vtagtype in vnode.h */ 542 if (tvp->v_tag != VT_CODA) { 543 vrele(tvp); 544 MARK_INT_FAIL(CODA_IOCTL_STATS); 545 CODADEBUG(CODA_IOCTL, myprintf(("%s error: %s not a coda object\n", 546 __func__, iap->path));) 547 return(EINVAL); 548 } 549 550 if (iap->vi.in_size > VC_MAXDATASIZE || iap->vi.out_size > VC_MAXDATASIZE) { 551 vrele(tvp); 552 return(EINVAL); 553 } 554 error = venus_ioctl(vtomi(tvp), &((VTOC(tvp))->c_fid), com, flag, data, 555 cred, curlwp); 556 557 if (error) 558 MARK_INT_FAIL(CODA_IOCTL_STATS); 559 else 560 CODADEBUG(CODA_IOCTL, myprintf(("Ioctl returns %d \n", error)); ) 561 562 vrele(tvp); 563 return(error); 564 } 565 566 /* 567 * To reduce the cost of a user-level venus;we cache attributes in 568 * the kernel. Each cnode has storage allocated for an attribute. If 569 * c_vattr is valid, return a reference to it. Otherwise, get the 570 * attributes from venus and store them in the cnode. There is some 571 * question if this method is a security leak. But I think that in 572 * order to make this call, the user must have done a lookup and 573 * opened the file, and therefore should already have access. 574 */ 575 int 576 coda_getattr(void *v) 577 { 578 /* true args */ 579 struct vop_getattr_args *ap = v; 580 vnode_t *vp = ap->a_vp; 581 struct cnode *cp = VTOC(vp); 582 struct vattr *vap = ap->a_vap; 583 kauth_cred_t cred = ap->a_cred; 584 /* locals */ 585 int error; 586 587 MARK_ENTRY(CODA_GETATTR_STATS); 588 589 /* Check for getattr of control object. */ 590 if (IS_CTL_VP(vp)) { 591 MARK_INT_FAIL(CODA_GETATTR_STATS); 592 return(ENOENT); 593 } 594 595 /* Check to see if the attributes have already been cached */ 596 if (VALID_VATTR(cp)) { 597 CODADEBUG(CODA_GETATTR, { myprintf(("%s: attr cache hit: %s\n", 598 __func__, coda_f2s(&cp->c_fid)));}) 599 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 600 coda_print_vattr(&cp->c_vattr); ) 601 602 *vap = cp->c_vattr; 603 MARK_INT_SAT(CODA_GETATTR_STATS); 604 return(0); 605 } 606 607 error = venus_getattr(vtomi(vp), &cp->c_fid, cred, curlwp, vap); 608 609 if (!error) { 610 CODADEBUG(CODA_GETATTR, myprintf(("%s miss %s: result %d\n", 611 __func__, coda_f2s(&cp->c_fid), error)); ) 612 613 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 614 coda_print_vattr(vap); ) 615 616 /* If not open for write, store attributes in cnode */ 617 if ((cp->c_owrite == 0) && (coda_attr_cache)) { 618 cp->c_vattr = *vap; 619 cp->c_flags |= C_VATTR; 620 } 621 622 } 623 return(error); 624 } 625 626 int 627 coda_setattr(void *v) 628 { 629 /* true args */ 630 struct vop_setattr_args *ap = v; 631 vnode_t *vp = ap->a_vp; 632 struct cnode *cp = VTOC(vp); 633 struct vattr *vap = ap->a_vap; 634 kauth_cred_t cred = ap->a_cred; 635 /* locals */ 636 int error; 637 638 MARK_ENTRY(CODA_SETATTR_STATS); 639 640 /* Check for setattr of control object. */ 641 if (IS_CTL_VP(vp)) { 642 MARK_INT_FAIL(CODA_SETATTR_STATS); 643 return(ENOENT); 644 } 645 646 if (codadebug & CODADBGMSK(CODA_SETATTR)) { 647 coda_print_vattr(vap); 648 } 649 error = venus_setattr(vtomi(vp), &cp->c_fid, vap, cred, curlwp); 650 651 if (!error) 652 cp->c_flags &= ~C_VATTR; 653 654 CODADEBUG(CODA_SETATTR, myprintf(("setattr %d\n", error)); ) 655 return(error); 656 } 657 658 int 659 coda_access(void *v) 660 { 661 /* true args */ 662 struct vop_access_args *ap = v; 663 vnode_t *vp = ap->a_vp; 664 struct cnode *cp = VTOC(vp); 665 int mode = ap->a_mode; 666 kauth_cred_t cred = ap->a_cred; 667 /* locals */ 668 int error; 669 670 MARK_ENTRY(CODA_ACCESS_STATS); 671 672 /* Check for access of control object. Only read access is 673 allowed on it. */ 674 if (IS_CTL_VP(vp)) { 675 /* bogus hack - all will be marked as successes */ 676 MARK_INT_SAT(CODA_ACCESS_STATS); 677 return(((mode & VREAD) && !(mode & (VWRITE | VEXEC))) 678 ? 0 : EACCES); 679 } 680 681 /* 682 * if the file is a directory, and we are checking exec (eg lookup) 683 * access, and the file is in the namecache, then the user must have 684 * lookup access to it. 685 */ 686 if (coda_access_cache) { 687 if ((vp->v_type == VDIR) && (mode & VEXEC)) { 688 if (coda_nc_lookup(cp, ".", 1, cred)) { 689 MARK_INT_SAT(CODA_ACCESS_STATS); 690 return(0); /* it was in the cache */ 691 } 692 } 693 } 694 695 error = venus_access(vtomi(vp), &cp->c_fid, mode, cred, curlwp); 696 697 return(error); 698 } 699 700 /* 701 * CODA abort op, called after namei() when a CREATE/DELETE isn't actually 702 * done. If a buffer has been saved in anticipation of a coda_create or 703 * a coda_remove, delete it. 704 */ 705 /* ARGSUSED */ 706 int 707 coda_abortop(void *v) 708 { 709 /* true args */ 710 struct vop_abortop_args /* { 711 vnode_t *a_dvp; 712 struct componentname *a_cnp; 713 } */ *ap = v; 714 715 (void)ap; 716 /* upcall decl */ 717 /* locals */ 718 719 return (0); 720 } 721 722 int 723 coda_readlink(void *v) 724 { 725 /* true args */ 726 struct vop_readlink_args *ap = v; 727 vnode_t *vp = ap->a_vp; 728 struct cnode *cp = VTOC(vp); 729 struct uio *uiop = ap->a_uio; 730 kauth_cred_t cred = ap->a_cred; 731 /* locals */ 732 struct lwp *l = curlwp; 733 int error; 734 char *str; 735 int len; 736 737 MARK_ENTRY(CODA_READLINK_STATS); 738 739 /* Check for readlink of control object. */ 740 if (IS_CTL_VP(vp)) { 741 MARK_INT_FAIL(CODA_READLINK_STATS); 742 return(ENOENT); 743 } 744 745 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { /* symlink was cached */ 746 uiop->uio_rw = UIO_READ; 747 error = uiomove(cp->c_symlink, (int)cp->c_symlen, uiop); 748 if (error) 749 MARK_INT_FAIL(CODA_READLINK_STATS); 750 else 751 MARK_INT_SAT(CODA_READLINK_STATS); 752 return(error); 753 } 754 755 error = venus_readlink(vtomi(vp), &cp->c_fid, cred, l, &str, &len); 756 757 if (!error) { 758 uiop->uio_rw = UIO_READ; 759 error = uiomove(str, len, uiop); 760 761 if (coda_symlink_cache) { 762 cp->c_symlink = str; 763 cp->c_symlen = len; 764 cp->c_flags |= C_SYMLINK; 765 } else 766 CODA_FREE(str, len); 767 } 768 769 CODADEBUG(CODA_READLINK, myprintf(("in readlink result %d\n",error));) 770 return(error); 771 } 772 773 int 774 coda_fsync(void *v) 775 { 776 /* true args */ 777 struct vop_fsync_args *ap = v; 778 vnode_t *vp = ap->a_vp; 779 struct cnode *cp = VTOC(vp); 780 kauth_cred_t cred = ap->a_cred; 781 /* locals */ 782 vnode_t *convp = cp->c_ovp; 783 int error; 784 785 MARK_ENTRY(CODA_FSYNC_STATS); 786 787 /* Check for fsync on an unmounting object */ 788 /* The NetBSD kernel, in its infinite wisdom, can try to fsync 789 * after an unmount has been initiated. This is a Bad Thing, 790 * which we have to avoid. Not a legitimate failure for stats. 791 */ 792 if (IS_UNMOUNTING(cp)) { 793 return(ENODEV); 794 } 795 796 /* Check for fsync of control object or unitialized cnode. */ 797 if (IS_CTL_VP(vp) || vp->v_type == VNON) { 798 MARK_INT_SAT(CODA_FSYNC_STATS); 799 return(0); 800 } 801 802 if (convp) 803 VOP_FSYNC(convp, cred, MNT_WAIT, 0, 0); 804 805 /* 806 * We can expect fsync on any vnode at all if venus is pruging it. 807 * Venus can't very well answer the fsync request, now can it? 808 * Hopefully, it won't have to, because hopefully, venus preserves 809 * the (possibly untrue) invariant that it never purges an open 810 * vnode. Hopefully. 811 */ 812 if (cp->c_flags & C_PURGING) { 813 return(0); 814 } 815 816 error = venus_fsync(vtomi(vp), &cp->c_fid, cred, curlwp); 817 818 CODADEBUG(CODA_FSYNC, myprintf(("in fsync result %d\n",error)); ) 819 return(error); 820 } 821 822 /* 823 * vp is locked on entry, and we must unlock it. 824 * XXX This routine is suspect and probably needs rewriting. 825 */ 826 int 827 coda_inactive(void *v) 828 { 829 /* true args */ 830 struct vop_inactive_args *ap = v; 831 vnode_t *vp = ap->a_vp; 832 struct cnode *cp = VTOC(vp); 833 kauth_cred_t cred __unused = NULL; 834 835 /* We don't need to send inactive to venus - DCS */ 836 MARK_ENTRY(CODA_INACTIVE_STATS); 837 838 if (IS_CTL_VP(vp)) { 839 MARK_INT_SAT(CODA_INACTIVE_STATS); 840 VOP_UNLOCK(vp); 841 return 0; 842 } 843 844 CODADEBUG(CODA_INACTIVE, myprintf(("in inactive, %s, vfsp %p\n", 845 coda_f2s(&cp->c_fid), vp->v_mount));) 846 847 if (vp->v_mount->mnt_data == NULL) { 848 myprintf(("Help! vfsp->vfs_data was NULL, but vnode %p wasn't dying\n", vp)); 849 panic("badness in coda_inactive"); 850 } 851 852 #ifdef CODA_VERBOSE 853 /* Sanity checks that perhaps should be panic. */ 854 if (vp->v_usecount > 1) 855 printf("%s: %p usecount %d\n", __func__, vp, vp->v_usecount); 856 if (cp->c_ovp != NULL) 857 printf("%s: %p ovp != NULL\n", __func__, vp); 858 #endif 859 /* XXX Do we need to VOP_CLOSE container vnodes? */ 860 VOP_UNLOCK(vp); 861 if (!IS_UNMOUNTING(cp)) 862 *ap->a_recycle = true; 863 864 MARK_INT_SAT(CODA_INACTIVE_STATS); 865 return(0); 866 } 867 868 /* 869 * Coda does not use the normal namecache, but a private version. 870 * Consider how to use the standard facility instead. 871 */ 872 int 873 coda_lookup(void *v) 874 { 875 /* true args */ 876 struct vop_lookup_v2_args *ap = v; 877 /* (locked) vnode of dir in which to do lookup */ 878 vnode_t *dvp = ap->a_dvp; 879 struct cnode *dcp = VTOC(dvp); 880 /* output variable for result */ 881 vnode_t **vpp = ap->a_vpp; 882 /* name to lookup */ 883 struct componentname *cnp = ap->a_cnp; 884 kauth_cred_t cred = cnp->cn_cred; 885 struct lwp *l = curlwp; 886 /* locals */ 887 struct cnode *cp; 888 const char *nm = cnp->cn_nameptr; 889 int len = cnp->cn_namelen; 890 CodaFid VFid; 891 int vtype; 892 int error = 0; 893 894 MARK_ENTRY(CODA_LOOKUP_STATS); 895 896 CODADEBUG(CODA_LOOKUP, myprintf(("%s: %s in %s\n", __func__, 897 nm, coda_f2s(&dcp->c_fid)));) 898 899 /* 900 * XXX componentname flags in MODMASK are not handled at all 901 */ 902 903 /* 904 * The overall strategy is to switch on the lookup type and get a 905 * result vnode that is vref'd but not locked. 906 */ 907 908 /* Check for lookup of control object. */ 909 if (IS_CTL_NAME(dvp, nm, len)) { 910 *vpp = coda_ctlvp; 911 vref(*vpp); 912 MARK_INT_SAT(CODA_LOOKUP_STATS); 913 goto exit; 914 } 915 916 /* Avoid trying to hand venus an unreasonably long name. */ 917 if (len+1 > CODA_MAXNAMLEN) { 918 MARK_INT_FAIL(CODA_LOOKUP_STATS); 919 CODADEBUG(CODA_LOOKUP, myprintf(("%s: name too long:, %s (%s)\n", 920 __func__, coda_f2s(&dcp->c_fid), nm));) 921 *vpp = (vnode_t *)0; 922 error = EINVAL; 923 goto exit; 924 } 925 926 /* 927 * Try to resolve the lookup in the minicache. If that fails, ask 928 * venus to do the lookup. XXX The interaction between vnode 929 * locking and any locking that coda does is not clear. 930 */ 931 cp = coda_nc_lookup(dcp, nm, len, cred); 932 if (cp) { 933 *vpp = CTOV(cp); 934 vref(*vpp); 935 CODADEBUG(CODA_LOOKUP, 936 myprintf(("lookup result %d vpp %p\n",error,*vpp));) 937 } else { 938 /* The name wasn't cached, so ask Venus. */ 939 error = venus_lookup(vtomi(dvp), &dcp->c_fid, nm, len, cred, l, &VFid, 940 &vtype); 941 942 if (error) { 943 MARK_INT_FAIL(CODA_LOOKUP_STATS); 944 CODADEBUG(CODA_LOOKUP, myprintf(("%s: lookup error on %s (%s)%d\n", 945 __func__, coda_f2s(&dcp->c_fid), nm, error));) 946 *vpp = (vnode_t *)0; 947 } else { 948 MARK_INT_SAT(CODA_LOOKUP_STATS); 949 CODADEBUG(CODA_LOOKUP, myprintf(("%s: %s type %o result %d\n", 950 __func__, coda_f2s(&VFid), vtype, error)); ) 951 952 cp = make_coda_node(&VFid, dvp->v_mount, vtype); 953 *vpp = CTOV(cp); 954 /* vpp is now vrefed. */ 955 956 /* 957 * Unless this vnode is marked CODA_NOCACHE, enter it into 958 * the coda name cache to avoid a future venus round-trip. 959 * XXX Interaction with componentname NOCACHE is unclear. 960 */ 961 if (!(vtype & CODA_NOCACHE)) 962 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 963 } 964 } 965 966 exit: 967 /* 968 * If we are creating, and this was the last name to be looked up, 969 * and the error was ENOENT, then make the leaf NULL and return 970 * success. 971 * XXX Check against new lookup rules. 972 */ 973 if (((cnp->cn_nameiop == CREATE) || (cnp->cn_nameiop == RENAME)) 974 && (cnp->cn_flags & ISLASTCN) 975 && (error == ENOENT)) 976 { 977 error = EJUSTRETURN; 978 *ap->a_vpp = NULL; 979 } 980 981 return(error); 982 } 983 984 /*ARGSUSED*/ 985 int 986 coda_create(void *v) 987 { 988 /* true args */ 989 struct vop_create_v3_args *ap = v; 990 vnode_t *dvp = ap->a_dvp; 991 struct cnode *dcp = VTOC(dvp); 992 struct vattr *va = ap->a_vap; 993 int exclusive = 1; 994 int mode = ap->a_vap->va_mode; 995 vnode_t **vpp = ap->a_vpp; 996 struct componentname *cnp = ap->a_cnp; 997 kauth_cred_t cred = cnp->cn_cred; 998 struct lwp *l = curlwp; 999 /* locals */ 1000 int error; 1001 struct cnode *cp; 1002 const char *nm = cnp->cn_nameptr; 1003 int len = cnp->cn_namelen; 1004 CodaFid VFid; 1005 struct vattr attr; 1006 1007 MARK_ENTRY(CODA_CREATE_STATS); 1008 1009 /* All creates are exclusive XXX */ 1010 /* I'm assuming the 'mode' argument is the file mode bits XXX */ 1011 1012 /* Check for create of control object. */ 1013 if (IS_CTL_NAME(dvp, nm, len)) { 1014 *vpp = (vnode_t *)0; 1015 MARK_INT_FAIL(CODA_CREATE_STATS); 1016 return(EACCES); 1017 } 1018 1019 error = venus_create(vtomi(dvp), &dcp->c_fid, nm, len, exclusive, mode, va, cred, l, &VFid, &attr); 1020 1021 if (!error) { 1022 1023 /* 1024 * XXX Violation of venus/kernel invariants is a difficult case, 1025 * but venus should not be able to cause a panic. 1026 */ 1027 /* If this is an exclusive create, panic if the file already exists. */ 1028 /* Venus should have detected the file and reported EEXIST. */ 1029 1030 if ((exclusive == 1) && 1031 (coda_find(&VFid) != NULL)) 1032 panic("cnode existed for newly created file!"); 1033 1034 cp = make_coda_node(&VFid, dvp->v_mount, attr.va_type); 1035 *vpp = CTOV(cp); 1036 1037 /* XXX vnodeops doesn't say this argument can be changed. */ 1038 /* Update va to reflect the new attributes. */ 1039 (*va) = attr; 1040 1041 /* Update the attribute cache and mark it as valid */ 1042 if (coda_attr_cache) { 1043 VTOC(*vpp)->c_vattr = attr; 1044 VTOC(*vpp)->c_flags |= C_VATTR; 1045 } 1046 1047 /* Invalidate parent's attr cache (modification time has changed). */ 1048 VTOC(dvp)->c_flags &= ~C_VATTR; 1049 1050 /* enter the new vnode in the Name Cache */ 1051 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1052 1053 CODADEBUG(CODA_CREATE, myprintf(("%s: %s, result %d\n", __func__, 1054 coda_f2s(&VFid), error)); ) 1055 } else { 1056 *vpp = (vnode_t *)0; 1057 CODADEBUG(CODA_CREATE, myprintf(("%s: create error %d\n", __func__, 1058 error));) 1059 } 1060 1061 if (!error) { 1062 #ifdef CODA_VERBOSE 1063 if ((cnp->cn_flags & LOCKLEAF) == 0) 1064 /* This should not happen; flags are for lookup only. */ 1065 printf("%s: LOCKLEAF not set!\n", __func__); 1066 #endif 1067 } 1068 1069 return(error); 1070 } 1071 1072 int 1073 coda_remove(void *v) 1074 { 1075 /* true args */ 1076 struct vop_remove_args *ap = v; 1077 vnode_t *dvp = ap->a_dvp; 1078 struct cnode *cp = VTOC(dvp); 1079 vnode_t *vp = ap->a_vp; 1080 struct componentname *cnp = ap->a_cnp; 1081 kauth_cred_t cred = cnp->cn_cred; 1082 struct lwp *l = curlwp; 1083 /* locals */ 1084 int error; 1085 const char *nm = cnp->cn_nameptr; 1086 int len = cnp->cn_namelen; 1087 struct cnode *tp; 1088 1089 MARK_ENTRY(CODA_REMOVE_STATS); 1090 1091 CODADEBUG(CODA_REMOVE, myprintf(("%s: %s in %s\n", __func__, 1092 nm, coda_f2s(&cp->c_fid)));) 1093 1094 /* Remove the file's entry from the CODA Name Cache */ 1095 /* We're being conservative here, it might be that this person 1096 * doesn't really have sufficient access to delete the file 1097 * but we feel zapping the entry won't really hurt anyone -- dcs 1098 */ 1099 /* I'm gonna go out on a limb here. If a file and a hardlink to it 1100 * exist, and one is removed, the link count on the other will be 1101 * off by 1. We could either invalidate the attrs if cached, or 1102 * fix them. I'll try to fix them. DCS 11/8/94 1103 */ 1104 tp = coda_nc_lookup(VTOC(dvp), nm, len, cred); 1105 if (tp) { 1106 if (VALID_VATTR(tp)) { /* If attrs are cached */ 1107 if (tp->c_vattr.va_nlink > 1) { /* If it's a hard link */ 1108 tp->c_vattr.va_nlink--; 1109 } 1110 } 1111 1112 coda_nc_zapfile(VTOC(dvp), nm, len); 1113 /* No need to flush it if it doesn't exist! */ 1114 } 1115 /* Invalidate the parent's attr cache, the modification time has changed */ 1116 VTOC(dvp)->c_flags &= ~C_VATTR; 1117 1118 /* Check for remove of control object. */ 1119 if (IS_CTL_NAME(dvp, nm, len)) { 1120 MARK_INT_FAIL(CODA_REMOVE_STATS); 1121 return(ENOENT); 1122 } 1123 1124 error = venus_remove(vtomi(dvp), &cp->c_fid, nm, len, cred, l); 1125 1126 CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n",error)); ) 1127 1128 /* 1129 * Unlock parent and child (avoiding double if "."). 1130 */ 1131 if (dvp == vp) { 1132 vrele(vp); 1133 } else { 1134 vput(vp); 1135 } 1136 vput(dvp); 1137 1138 return(error); 1139 } 1140 1141 /* 1142 * dvp is the directory where the link is to go, and is locked. 1143 * vp is the object to be linked to, and is unlocked. 1144 * At exit, we must unlock dvp, and vput dvp. 1145 */ 1146 int 1147 coda_link(void *v) 1148 { 1149 /* true args */ 1150 struct vop_link_args *ap = v; 1151 vnode_t *vp = ap->a_vp; 1152 struct cnode *cp = VTOC(vp); 1153 vnode_t *dvp = ap->a_dvp; 1154 struct cnode *dcp = VTOC(dvp); 1155 struct componentname *cnp = ap->a_cnp; 1156 kauth_cred_t cred = cnp->cn_cred; 1157 struct lwp *l = curlwp; 1158 /* locals */ 1159 int error; 1160 const char *nm = cnp->cn_nameptr; 1161 int len = cnp->cn_namelen; 1162 1163 MARK_ENTRY(CODA_LINK_STATS); 1164 1165 if (codadebug & CODADBGMSK(CODA_LINK)) { 1166 1167 myprintf(("%s: vp fid: %s\n", __func__, coda_f2s(&cp->c_fid))); 1168 myprintf(("%s: dvp fid: %s)\n", __func__, coda_f2s(&dcp->c_fid))); 1169 1170 } 1171 if (codadebug & CODADBGMSK(CODA_LINK)) { 1172 myprintf(("%s: vp fid: %s\n", __func__, coda_f2s(&cp->c_fid))); 1173 myprintf(("%s: dvp fid: %s\n", __func__, coda_f2s(&dcp->c_fid))); 1174 1175 } 1176 1177 /* Check for link to/from control object. */ 1178 if (IS_CTL_NAME(dvp, nm, len) || IS_CTL_VP(vp)) { 1179 MARK_INT_FAIL(CODA_LINK_STATS); 1180 return(EACCES); 1181 } 1182 1183 /* If linking . to a name, error out earlier. */ 1184 if (vp == dvp) { 1185 #ifdef CODA_VERBOSE 1186 printf("%s coda_link vp==dvp\n", __func__); 1187 #endif 1188 error = EISDIR; 1189 goto exit; 1190 } 1191 1192 /* XXX Why does venus_link need the vnode to be locked?*/ 1193 if ((error = vn_lock(vp, LK_EXCLUSIVE)) != 0) { 1194 #ifdef CODA_VERBOSE 1195 printf("%s: couldn't lock vnode %p\n", __func__, vp); 1196 #endif 1197 error = EFAULT; /* XXX better value */ 1198 goto exit; 1199 } 1200 error = venus_link(vtomi(vp), &cp->c_fid, &dcp->c_fid, nm, len, cred, l); 1201 VOP_UNLOCK(vp); 1202 1203 /* Invalidate parent's attr cache (the modification time has changed). */ 1204 VTOC(dvp)->c_flags &= ~C_VATTR; 1205 /* Invalidate child's attr cache (XXX why). */ 1206 VTOC(vp)->c_flags &= ~C_VATTR; 1207 1208 CODADEBUG(CODA_LINK, myprintf(("in link result %d\n",error)); ) 1209 1210 exit: 1211 vput(dvp); 1212 return(error); 1213 } 1214 1215 int 1216 coda_rename(void *v) 1217 { 1218 /* true args */ 1219 struct vop_rename_args *ap = v; 1220 vnode_t *odvp = ap->a_fdvp; 1221 struct cnode *odcp = VTOC(odvp); 1222 struct componentname *fcnp = ap->a_fcnp; 1223 vnode_t *ndvp = ap->a_tdvp; 1224 struct cnode *ndcp = VTOC(ndvp); 1225 struct componentname *tcnp = ap->a_tcnp; 1226 kauth_cred_t cred = fcnp->cn_cred; 1227 struct lwp *l = curlwp; 1228 /* true args */ 1229 int error; 1230 const char *fnm = fcnp->cn_nameptr; 1231 int flen = fcnp->cn_namelen; 1232 const char *tnm = tcnp->cn_nameptr; 1233 int tlen = tcnp->cn_namelen; 1234 1235 MARK_ENTRY(CODA_RENAME_STATS); 1236 1237 /* Hmmm. The vnodes are already looked up. Perhaps they are locked? 1238 This could be Bad. XXX */ 1239 #ifdef OLD_DIAGNOSTIC 1240 if ((fcnp->cn_cred != tcnp->cn_cred) 1241 || (fcnp->cn_lwp != tcnp->cn_lwp)) 1242 { 1243 panic("%s: component names don't agree", __func__); 1244 } 1245 #endif 1246 1247 /* Check for rename involving control object. */ 1248 if (IS_CTL_NAME(odvp, fnm, flen) || IS_CTL_NAME(ndvp, tnm, tlen)) { 1249 MARK_INT_FAIL(CODA_RENAME_STATS); 1250 return(EACCES); 1251 } 1252 1253 /* Problem with moving directories -- need to flush entry for .. */ 1254 if (odvp != ndvp) { 1255 struct cnode *ovcp = coda_nc_lookup(VTOC(odvp), fnm, flen, cred); 1256 if (ovcp) { 1257 vnode_t *ovp = CTOV(ovcp); 1258 if ((ovp) && 1259 (ovp->v_type == VDIR)) /* If it's a directory */ 1260 coda_nc_zapfile(VTOC(ovp),"..", 2); 1261 } 1262 } 1263 1264 /* Remove the entries for both source and target files */ 1265 coda_nc_zapfile(VTOC(odvp), fnm, flen); 1266 coda_nc_zapfile(VTOC(ndvp), tnm, tlen); 1267 1268 /* Invalidate the parent's attr cache, the modification time has changed */ 1269 VTOC(odvp)->c_flags &= ~C_VATTR; 1270 VTOC(ndvp)->c_flags &= ~C_VATTR; 1271 1272 if (flen+1 > CODA_MAXNAMLEN) { 1273 MARK_INT_FAIL(CODA_RENAME_STATS); 1274 error = EINVAL; 1275 goto exit; 1276 } 1277 1278 if (tlen+1 > CODA_MAXNAMLEN) { 1279 MARK_INT_FAIL(CODA_RENAME_STATS); 1280 error = EINVAL; 1281 goto exit; 1282 } 1283 1284 error = venus_rename(vtomi(odvp), &odcp->c_fid, &ndcp->c_fid, fnm, flen, tnm, tlen, cred, l); 1285 1286 exit: 1287 CODADEBUG(CODA_RENAME, myprintf(("in rename result %d\n",error));) 1288 /* XXX - do we need to call cache pureg on the moved vnode? */ 1289 cache_purge(ap->a_fvp); 1290 1291 /* It seems to be incumbent on us to drop locks on all four vnodes */ 1292 /* From-vnodes are not locked, only ref'd. To-vnodes are locked. */ 1293 1294 vrele(ap->a_fvp); 1295 vrele(odvp); 1296 1297 if (ap->a_tvp) { 1298 if (ap->a_tvp == ndvp) { 1299 vrele(ap->a_tvp); 1300 } else { 1301 vput(ap->a_tvp); 1302 } 1303 } 1304 1305 vput(ndvp); 1306 return(error); 1307 } 1308 1309 int 1310 coda_mkdir(void *v) 1311 { 1312 /* true args */ 1313 struct vop_mkdir_v3_args *ap = v; 1314 vnode_t *dvp = ap->a_dvp; 1315 struct cnode *dcp = VTOC(dvp); 1316 struct componentname *cnp = ap->a_cnp; 1317 struct vattr *va = ap->a_vap; 1318 vnode_t **vpp = ap->a_vpp; 1319 kauth_cred_t cred = cnp->cn_cred; 1320 struct lwp *l = curlwp; 1321 /* locals */ 1322 int error; 1323 const char *nm = cnp->cn_nameptr; 1324 int len = cnp->cn_namelen; 1325 struct cnode *cp; 1326 CodaFid VFid; 1327 struct vattr ova; 1328 1329 MARK_ENTRY(CODA_MKDIR_STATS); 1330 1331 /* Check for mkdir of target object. */ 1332 if (IS_CTL_NAME(dvp, nm, len)) { 1333 *vpp = (vnode_t *)0; 1334 MARK_INT_FAIL(CODA_MKDIR_STATS); 1335 return(EACCES); 1336 } 1337 1338 if (len+1 > CODA_MAXNAMLEN) { 1339 *vpp = (vnode_t *)0; 1340 MARK_INT_FAIL(CODA_MKDIR_STATS); 1341 return(EACCES); 1342 } 1343 1344 error = venus_mkdir(vtomi(dvp), &dcp->c_fid, nm, len, va, cred, l, &VFid, &ova); 1345 1346 if (!error) { 1347 if (coda_find(&VFid) != NULL) 1348 panic("cnode existed for newly created directory!"); 1349 1350 1351 cp = make_coda_node(&VFid, dvp->v_mount, va->va_type); 1352 *vpp = CTOV(cp); 1353 1354 /* enter the new vnode in the Name Cache */ 1355 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1356 1357 /* as a side effect, enter "." and ".." for the directory */ 1358 coda_nc_enter(VTOC(*vpp), ".", 1, cred, VTOC(*vpp)); 1359 coda_nc_enter(VTOC(*vpp), "..", 2, cred, VTOC(dvp)); 1360 1361 if (coda_attr_cache) { 1362 VTOC(*vpp)->c_vattr = ova; /* update the attr cache */ 1363 VTOC(*vpp)->c_flags |= C_VATTR; /* Valid attributes in cnode */ 1364 } 1365 1366 /* Invalidate the parent's attr cache, the modification time has changed */ 1367 VTOC(dvp)->c_flags &= ~C_VATTR; 1368 1369 CODADEBUG( CODA_MKDIR, myprintf(("%s: %s result %d\n", __func__, 1370 coda_f2s(&VFid), error)); ) 1371 } else { 1372 *vpp = (vnode_t *)0; 1373 CODADEBUG(CODA_MKDIR, myprintf(("%s error %d\n", __func__, error));) 1374 } 1375 1376 return(error); 1377 } 1378 1379 int 1380 coda_rmdir(void *v) 1381 { 1382 /* true args */ 1383 struct vop_rmdir_args *ap = v; 1384 vnode_t *dvp = ap->a_dvp; 1385 struct cnode *dcp = VTOC(dvp); 1386 vnode_t *vp = ap->a_vp; 1387 struct componentname *cnp = ap->a_cnp; 1388 kauth_cred_t cred = cnp->cn_cred; 1389 struct lwp *l = curlwp; 1390 /* true args */ 1391 int error; 1392 const char *nm = cnp->cn_nameptr; 1393 int len = cnp->cn_namelen; 1394 struct cnode *cp; 1395 1396 MARK_ENTRY(CODA_RMDIR_STATS); 1397 1398 /* Check for rmdir of control object. */ 1399 if (IS_CTL_NAME(dvp, nm, len)) { 1400 MARK_INT_FAIL(CODA_RMDIR_STATS); 1401 return(ENOENT); 1402 } 1403 1404 /* Can't remove . in self. */ 1405 if (dvp == vp) { 1406 #ifdef CODA_VERBOSE 1407 printf("%s: dvp == vp\n", __func__); 1408 #endif 1409 error = EINVAL; 1410 goto exit; 1411 } 1412 1413 /* 1414 * The caller may not have adequate permissions, and the venus 1415 * operation may fail, but it doesn't hurt from a correctness 1416 * viewpoint to invalidate cache entries. 1417 * XXX Why isn't this done after the venus_rmdir call? 1418 */ 1419 /* Look up child in name cache (by name, from parent). */ 1420 cp = coda_nc_lookup(dcp, nm, len, cred); 1421 /* If found, remove all children of the child (., ..). */ 1422 if (cp) coda_nc_zapParentfid(&(cp->c_fid), NOT_DOWNCALL); 1423 1424 /* Remove child's own entry. */ 1425 coda_nc_zapfile(dcp, nm, len); 1426 1427 /* Invalidate parent's attr cache (the modification time has changed). */ 1428 dcp->c_flags &= ~C_VATTR; 1429 1430 error = venus_rmdir(vtomi(dvp), &dcp->c_fid, nm, len, cred, l); 1431 1432 CODADEBUG(CODA_RMDIR, myprintf(("in rmdir result %d\n", error)); ) 1433 1434 exit: 1435 /* vput both vnodes */ 1436 vput(dvp); 1437 if (dvp == vp) { 1438 vrele(vp); 1439 } else { 1440 vput(vp); 1441 } 1442 1443 return(error); 1444 } 1445 1446 int 1447 coda_symlink(void *v) 1448 { 1449 /* true args */ 1450 struct vop_symlink_v3_args *ap = v; 1451 vnode_t *dvp = ap->a_dvp; 1452 struct cnode *dcp = VTOC(dvp); 1453 /* a_vpp is used in place below */ 1454 struct componentname *cnp = ap->a_cnp; 1455 struct vattr *tva = ap->a_vap; 1456 char *path = ap->a_target; 1457 kauth_cred_t cred = cnp->cn_cred; 1458 struct lwp *l = curlwp; 1459 /* locals */ 1460 int error; 1461 u_long saved_cn_flags; 1462 const char *nm = cnp->cn_nameptr; 1463 int len = cnp->cn_namelen; 1464 int plen = strlen(path); 1465 1466 /* 1467 * Here's the strategy for the moment: perform the symlink, then 1468 * do a lookup to grab the resulting vnode. I know this requires 1469 * two communications with Venus for a new sybolic link, but 1470 * that's the way the ball bounces. I don't yet want to change 1471 * the way the Mach symlink works. When Mach support is 1472 * deprecated, we should change symlink so that the common case 1473 * returns the resultant vnode in a vpp argument. 1474 */ 1475 1476 MARK_ENTRY(CODA_SYMLINK_STATS); 1477 1478 /* Check for symlink of control object. */ 1479 if (IS_CTL_NAME(dvp, nm, len)) { 1480 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1481 error = EACCES; 1482 goto exit; 1483 } 1484 1485 if (plen+1 > CODA_MAXPATHLEN) { 1486 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1487 error = EINVAL; 1488 goto exit; 1489 } 1490 1491 if (len+1 > CODA_MAXNAMLEN) { 1492 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1493 error = EINVAL; 1494 goto exit; 1495 } 1496 1497 error = venus_symlink(vtomi(dvp), &dcp->c_fid, path, plen, nm, len, tva, cred, l); 1498 1499 /* Invalidate the parent's attr cache (modification time has changed). */ 1500 dcp->c_flags &= ~C_VATTR; 1501 1502 if (!error) { 1503 /* 1504 * VOP_SYMLINK is not defined to pay attention to cnp->cn_flags; 1505 * these are defined only for VOP_LOOKUP. We desire to reuse 1506 * cnp for a VOP_LOOKUP operation, and must be sure to not pass 1507 * stray flags passed to us. Such stray flags can occur because 1508 * sys_symlink makes a namei call and then reuses the 1509 * componentname structure. 1510 */ 1511 /* 1512 * XXX Arguably we should create our own componentname structure 1513 * and not reuse the one that was passed in. 1514 */ 1515 saved_cn_flags = cnp->cn_flags; 1516 cnp->cn_flags &= ~(MODMASK | OPMASK); 1517 cnp->cn_flags |= LOOKUP; 1518 error = VOP_LOOKUP(dvp, ap->a_vpp, cnp); 1519 cnp->cn_flags = saved_cn_flags; 1520 } 1521 1522 exit: 1523 CODADEBUG(CODA_SYMLINK, myprintf(("in symlink result %d\n",error)); ) 1524 return(error); 1525 } 1526 1527 /* 1528 * Read directory entries. 1529 */ 1530 int 1531 coda_readdir(void *v) 1532 { 1533 /* true args */ 1534 struct vop_readdir_args *ap = v; 1535 vnode_t *vp = ap->a_vp; 1536 struct cnode *cp = VTOC(vp); 1537 struct uio *uiop = ap->a_uio; 1538 kauth_cred_t cred = ap->a_cred; 1539 int *eofflag = ap->a_eofflag; 1540 off_t **cookies = ap->a_cookies; 1541 int *ncookies = ap->a_ncookies; 1542 /* upcall decl */ 1543 /* locals */ 1544 int error = 0; 1545 1546 MARK_ENTRY(CODA_READDIR_STATS); 1547 1548 CODADEBUG(CODA_READDIR, myprintf(("%s: (%p, %lu, %lld)\n", __func__, 1549 uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, 1550 (long long) uiop->uio_offset)); ) 1551 1552 /* Check for readdir of control object. */ 1553 if (IS_CTL_VP(vp)) { 1554 MARK_INT_FAIL(CODA_READDIR_STATS); 1555 return(ENOENT); 1556 } 1557 1558 { 1559 /* Redirect the request to UFS. */ 1560 1561 /* If directory is not already open do an "internal open" on it. */ 1562 int opened_internally = 0; 1563 if (cp->c_ovp == NULL) { 1564 opened_internally = 1; 1565 MARK_INT_GEN(CODA_OPEN_STATS); 1566 error = VOP_OPEN(vp, FREAD, cred); 1567 #ifdef CODA_VERBOSE 1568 printf("%s: Internally Opening %p\n", __func__, vp); 1569 #endif 1570 if (error) return(error); 1571 } else 1572 vp = cp->c_ovp; 1573 1574 /* Have UFS handle the call. */ 1575 CODADEBUG(CODA_READDIR, myprintf(("%s: fid = %s, refcnt = %d\n", 1576 __func__, coda_f2s(&cp->c_fid), vp->v_usecount)); ) 1577 error = VOP_READDIR(vp, uiop, cred, eofflag, cookies, ncookies); 1578 if (error) 1579 MARK_INT_FAIL(CODA_READDIR_STATS); 1580 else 1581 MARK_INT_SAT(CODA_READDIR_STATS); 1582 1583 /* Do an "internal close" if necessary. */ 1584 if (opened_internally) { 1585 MARK_INT_GEN(CODA_CLOSE_STATS); 1586 (void)VOP_CLOSE(vp, FREAD, cred); 1587 } 1588 } 1589 1590 return(error); 1591 } 1592 1593 /* 1594 * Convert from file system blocks to device blocks 1595 */ 1596 int 1597 coda_bmap(void *v) 1598 { 1599 /* XXX on the global proc */ 1600 /* true args */ 1601 struct vop_bmap_args *ap = v; 1602 vnode_t *vp __unused = ap->a_vp; /* file's vnode */ 1603 daddr_t bn __unused = ap->a_bn; /* fs block number */ 1604 vnode_t **vpp = ap->a_vpp; /* RETURN vp of device */ 1605 daddr_t *bnp __unused = ap->a_bnp; /* RETURN device block number */ 1606 struct lwp *l __unused = curlwp; 1607 /* upcall decl */ 1608 /* locals */ 1609 1610 *vpp = (vnode_t *)0; 1611 myprintf(("coda_bmap called!\n")); 1612 return(EINVAL); 1613 } 1614 1615 /* 1616 * I don't think the following two things are used anywhere, so I've 1617 * commented them out 1618 * 1619 * struct buf *async_bufhead; 1620 * int async_daemon_count; 1621 */ 1622 int 1623 coda_strategy(void *v) 1624 { 1625 /* true args */ 1626 struct vop_strategy_args *ap = v; 1627 struct buf *bp __unused = ap->a_bp; 1628 struct lwp *l __unused = curlwp; 1629 /* upcall decl */ 1630 /* locals */ 1631 1632 myprintf(("coda_strategy called! ")); 1633 return(EINVAL); 1634 } 1635 1636 int 1637 coda_reclaim(void *v) 1638 { 1639 /* true args */ 1640 struct vop_reclaim_args *ap = v; 1641 vnode_t *vp = ap->a_vp; 1642 struct cnode *cp = VTOC(vp); 1643 /* upcall decl */ 1644 /* locals */ 1645 1646 /* 1647 * Forced unmount/flush will let vnodes with non zero use be destroyed! 1648 */ 1649 ENTRY; 1650 1651 if (IS_UNMOUNTING(cp)) { 1652 #ifdef DEBUG 1653 if (VTOC(vp)->c_ovp) { 1654 if (IS_UNMOUNTING(cp)) 1655 printf("%s: c_ovp not void: vp %p, cp %p\n", __func__, vp, cp); 1656 } 1657 #endif 1658 } else { 1659 #ifdef OLD_DIAGNOSTIC 1660 if (vp->v_usecount != 0) 1661 print("%s: pushing active %p\n", __func__, vp); 1662 if (VTOC(vp)->c_ovp) { 1663 panic("%s: c_ovp not void", __func__); 1664 } 1665 #endif 1666 } 1667 /* If an array has been allocated to hold the symlink, deallocate it */ 1668 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { 1669 if (cp->c_symlink == NULL) 1670 panic("%s: null symlink pointer in cnode", __func__); 1671 1672 CODA_FREE(cp->c_symlink, cp->c_symlen); 1673 cp->c_flags &= ~C_SYMLINK; 1674 cp->c_symlen = 0; 1675 } 1676 1677 /* Remove it from the table so it can't be found. */ 1678 vcache_remove(vp->v_mount, &cp->c_fid, sizeof(CodaFid)); 1679 1680 mutex_enter(vp->v_interlock); 1681 mutex_enter(&cp->c_lock); 1682 SET_VTOC(vp) = NULL; 1683 mutex_exit(&cp->c_lock); 1684 mutex_exit(vp->v_interlock); 1685 mutex_destroy(&cp->c_lock); 1686 kmem_free(cp, sizeof(*cp)); 1687 1688 return (0); 1689 } 1690 1691 int 1692 coda_lock(void *v) 1693 { 1694 /* true args */ 1695 struct vop_lock_args *ap = v; 1696 vnode_t *vp = ap->a_vp; 1697 struct cnode *cp = VTOC(vp); 1698 /* upcall decl */ 1699 /* locals */ 1700 1701 ENTRY; 1702 1703 if (coda_lockdebug) { 1704 myprintf(("Attempting lock on %s\n", 1705 coda_f2s(&cp->c_fid))); 1706 } 1707 1708 return genfs_lock(v); 1709 } 1710 1711 int 1712 coda_unlock(void *v) 1713 { 1714 /* true args */ 1715 struct vop_unlock_args *ap = v; 1716 vnode_t *vp = ap->a_vp; 1717 struct cnode *cp = VTOC(vp); 1718 /* upcall decl */ 1719 /* locals */ 1720 1721 ENTRY; 1722 if (coda_lockdebug) { 1723 myprintf(("Attempting unlock on %s\n", 1724 coda_f2s(&cp->c_fid))); 1725 } 1726 1727 return genfs_unlock(v); 1728 } 1729 1730 int 1731 coda_islocked(void *v) 1732 { 1733 /* true args */ 1734 ENTRY; 1735 1736 return genfs_islocked(v); 1737 } 1738 1739 /* 1740 * Given a device and inode, obtain a locked vnode. One reference is 1741 * obtained and passed back to the caller. 1742 */ 1743 int 1744 coda_grab_vnode(vnode_t *uvp, dev_t dev, ino_t ino, vnode_t **vpp) 1745 { 1746 int error; 1747 struct mount *mp; 1748 1749 /* Obtain mount point structure from device. */ 1750 if (!(mp = devtomp(dev))) { 1751 myprintf(("%s: devtomp(0x%llx) returns NULL\n", __func__, 1752 (unsigned long long)dev)); 1753 return(ENXIO); 1754 } 1755 1756 /* 1757 * Obtain vnode from mount point and inode. 1758 */ 1759 error = VFS_VGET(mp, ino, vpp); 1760 if (error) { 1761 myprintf(("%s: iget/vget(0x%llx, %llu) returns %p, err %d\n", __func__, 1762 (unsigned long long)dev, (unsigned long long)ino, *vpp, error)); 1763 return(ENOENT); 1764 } 1765 /* share the underlying vnode lock with the coda vnode */ 1766 mutex_obj_hold((*vpp)->v_interlock); 1767 uvm_obj_setlock(&uvp->v_uobj, (*vpp)->v_interlock); 1768 KASSERT(VOP_ISLOCKED(*vpp)); 1769 return(0); 1770 } 1771 1772 static void 1773 coda_print_vattr(struct vattr *attr) 1774 { 1775 const char *typestr; 1776 1777 switch (attr->va_type) { 1778 case VNON: 1779 typestr = "VNON"; 1780 break; 1781 case VREG: 1782 typestr = "VREG"; 1783 break; 1784 case VDIR: 1785 typestr = "VDIR"; 1786 break; 1787 case VBLK: 1788 typestr = "VBLK"; 1789 break; 1790 case VCHR: 1791 typestr = "VCHR"; 1792 break; 1793 case VLNK: 1794 typestr = "VLNK"; 1795 break; 1796 case VSOCK: 1797 typestr = "VSCK"; 1798 break; 1799 case VFIFO: 1800 typestr = "VFFO"; 1801 break; 1802 case VBAD: 1803 typestr = "VBAD"; 1804 break; 1805 default: 1806 typestr = "????"; 1807 break; 1808 } 1809 1810 1811 myprintf(("attr: type %s mode %d uid %d gid %d fsid %d rdev %d\n", 1812 typestr, (int)attr->va_mode, (int)attr->va_uid, 1813 (int)attr->va_gid, (int)attr->va_fsid, (int)attr->va_rdev)); 1814 1815 myprintf((" fileid %d nlink %d size %d blocksize %d bytes %d\n", 1816 (int)attr->va_fileid, (int)attr->va_nlink, 1817 (int)attr->va_size, 1818 (int)attr->va_blocksize,(int)attr->va_bytes)); 1819 myprintf((" gen %ld flags %ld vaflags %d\n", 1820 attr->va_gen, attr->va_flags, attr->va_vaflags)); 1821 myprintf((" atime sec %d nsec %d\n", 1822 (int)attr->va_atime.tv_sec, (int)attr->va_atime.tv_nsec)); 1823 myprintf((" mtime sec %d nsec %d\n", 1824 (int)attr->va_mtime.tv_sec, (int)attr->va_mtime.tv_nsec)); 1825 myprintf((" ctime sec %d nsec %d\n", 1826 (int)attr->va_ctime.tv_sec, (int)attr->va_ctime.tv_nsec)); 1827 } 1828 1829 /* 1830 * Return a vnode for the given fid. 1831 * If no cnode exists for this fid create one and put it 1832 * in a table hashed by coda_f2i(). If the cnode for 1833 * this fid is already in the table return it (ref count is 1834 * incremented by coda_find. The cnode will be flushed from the 1835 * table when coda_inactive calls coda_unsave. 1836 */ 1837 struct cnode * 1838 make_coda_node(CodaFid *fid, struct mount *fvsp, short type) 1839 { 1840 int error __diagused; 1841 struct vnode *vp; 1842 struct cnode *cp; 1843 1844 error = vcache_get(fvsp, fid, sizeof(CodaFid), &vp); 1845 KASSERT(error == 0); 1846 1847 mutex_enter(vp->v_interlock); 1848 cp = VTOC(vp); 1849 KASSERT(cp != NULL); 1850 mutex_enter(&cp->c_lock); 1851 mutex_exit(vp->v_interlock); 1852 1853 if (vp->v_type != type) { 1854 if (vp->v_type == VCHR || vp->v_type == VBLK) 1855 spec_node_destroy(vp); 1856 vp->v_type = type; 1857 if (type == VCHR || type == VBLK) 1858 spec_node_init(vp, NODEV); 1859 uvm_vnp_setsize(vp, 0); 1860 } 1861 mutex_exit(&cp->c_lock); 1862 1863 return cp; 1864 } 1865 1866 /* 1867 * coda_getpages may be called on a vnode which has not been opened, 1868 * e.g. to fault in pages to execute a program. In that case, we must 1869 * open the file to get the container. The vnode may or may not be 1870 * locked, and we must leave it in the same state. 1871 */ 1872 int 1873 coda_getpages(void *v) 1874 { 1875 struct vop_getpages_args /* { 1876 vnode_t *a_vp; 1877 voff_t a_offset; 1878 struct vm_page **a_m; 1879 int *a_count; 1880 int a_centeridx; 1881 vm_prot_t a_access_type; 1882 int a_advice; 1883 int a_flags; 1884 } */ *ap = v; 1885 vnode_t *vp = ap->a_vp, *cvp; 1886 struct cnode *cp = VTOC(vp); 1887 struct lwp *l = curlwp; 1888 kauth_cred_t cred = l->l_cred; 1889 int error, cerror; 1890 int waslocked; /* 1 if vnode lock was held on entry */ 1891 int didopen = 0; /* 1 if we opened container file */ 1892 1893 /* 1894 * Handle a case that uvm_fault doesn't quite use yet. 1895 * See layer_vnops.c. for inspiration. 1896 */ 1897 if (ap->a_flags & PGO_LOCKED) { 1898 return EBUSY; 1899 } 1900 1901 KASSERT(mutex_owned(vp->v_interlock)); 1902 1903 /* Check for control object. */ 1904 if (IS_CTL_VP(vp)) { 1905 #ifdef CODA_VERBOSE 1906 printf("%s: control object %p\n", __func__, vp); 1907 #endif 1908 return(EINVAL); 1909 } 1910 1911 /* 1912 * XXX It's really not ok to be releasing the lock we get, 1913 * because we could be overlapping with another call to 1914 * getpages and drop a lock they are relying on. We need to 1915 * figure out whether getpages ever is called holding the 1916 * lock, and if we should serialize getpages calls by some 1917 * mechanism. 1918 */ 1919 /* XXX VOP_ISLOCKED() may not be used for lock decisions. */ 1920 waslocked = VOP_ISLOCKED(vp); 1921 1922 /* Get container file if not already present. */ 1923 cvp = cp->c_ovp; 1924 if (cvp == NULL) { 1925 /* 1926 * VOP_OPEN requires a locked vnode. We must avoid 1927 * locking the vnode if it is already locked, and 1928 * leave it in the same state on exit. 1929 */ 1930 if (waslocked == 0) { 1931 mutex_exit(vp->v_interlock); 1932 cerror = vn_lock(vp, LK_EXCLUSIVE); 1933 if (cerror) { 1934 #ifdef CODA_VERBOSE 1935 printf("%s: can't lock vnode %p\n", 1936 __func__, vp); 1937 #endif 1938 return cerror; 1939 } 1940 #ifdef CODA_VERBOSE 1941 printf("%s: locked vnode %p\n", __func__, vp); 1942 #endif 1943 } 1944 1945 /* 1946 * Open file (causes upcall to venus). 1947 * XXX Perhaps we should not fully open the file, but 1948 * simply obtain a container file. 1949 */ 1950 /* XXX Is it ok to do this while holding the mutex? */ 1951 cerror = VOP_OPEN(vp, FREAD, cred); 1952 1953 if (cerror) { 1954 #ifdef CODA_VERBOSE 1955 printf("%s: cannot open vnode %p => %d\n", __func__, 1956 vp, cerror); 1957 #endif 1958 if (waslocked == 0) 1959 VOP_UNLOCK(vp); 1960 return cerror; 1961 } 1962 1963 #ifdef CODA_VERBOSE 1964 printf("%s: opened vnode %p\n", __func__, vp); 1965 #endif 1966 cvp = cp->c_ovp; 1967 didopen = 1; 1968 if (waslocked == 0) 1969 mutex_enter(vp->v_interlock); 1970 } 1971 KASSERT(cvp != NULL); 1972 1973 /* Munge the arg structure to refer to the container vnode. */ 1974 KASSERT(cvp->v_interlock == vp->v_interlock); 1975 ap->a_vp = cp->c_ovp; 1976 1977 /* Finally, call getpages on it. */ 1978 error = VCALL(ap->a_vp, VOFFSET(vop_getpages), ap); 1979 1980 /* If we opened the vnode, we must close it. */ 1981 if (didopen) { 1982 /* 1983 * VOP_CLOSE requires a locked vnode, but we are still 1984 * holding the lock (or riding a caller's lock). 1985 */ 1986 cerror = VOP_CLOSE(vp, FREAD, cred); 1987 #ifdef CODA_VERBOSE 1988 if (cerror != 0) 1989 /* XXX How should we handle this? */ 1990 printf("%s: closed vnode %p -> %d\n", __func__, 1991 vp, cerror); 1992 #endif 1993 1994 /* If we obtained a lock, drop it. */ 1995 if (waslocked == 0) 1996 VOP_UNLOCK(vp); 1997 } 1998 1999 return error; 2000 } 2001 2002 /* 2003 * The protocol requires v_interlock to be held by the caller. 2004 */ 2005 int 2006 coda_putpages(void *v) 2007 { 2008 struct vop_putpages_args /* { 2009 vnode_t *a_vp; 2010 voff_t a_offlo; 2011 voff_t a_offhi; 2012 int a_flags; 2013 } */ *ap = v; 2014 vnode_t *vp = ap->a_vp, *cvp; 2015 struct cnode *cp = VTOC(vp); 2016 int error; 2017 2018 KASSERT(mutex_owned(vp->v_interlock)); 2019 2020 /* Check for control object. */ 2021 if (IS_CTL_VP(vp)) { 2022 mutex_exit(vp->v_interlock); 2023 #ifdef CODA_VERBOSE 2024 printf("%s: control object %p\n", __func__, vp); 2025 #endif 2026 return 0; 2027 } 2028 2029 /* 2030 * If container object is not present, then there are no pages 2031 * to put; just return without error. This happens all the 2032 * time, apparently during discard of a closed vnode (which 2033 * trivially can't have dirty pages). 2034 */ 2035 cvp = cp->c_ovp; 2036 if (cvp == NULL) { 2037 mutex_exit(vp->v_interlock); 2038 return 0; 2039 } 2040 2041 /* Munge the arg structure to refer to the container vnode. */ 2042 KASSERT(cvp->v_interlock == vp->v_interlock); 2043 ap->a_vp = cvp; 2044 2045 /* Finally, call putpages on it. */ 2046 error = VCALL(ap->a_vp, VOFFSET(vop_putpages), ap); 2047 2048 return error; 2049 } 2050
Indexes created Fri Oct 17 03:10:13 GMT 2025