coda_vnops.c revision 1.91
1 /* $NetBSD: coda_vnops.c,v 1.91 2013/10/17 20:55:30 christos 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 1.91 2013/10/17 20:55:30 christos 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 if (!VOP_ISLOCKED(vp)) 233 VOP_LOCK(vp, LK_EXCLUSIVE); 234 /* Check for open of control file. */ 235 if (IS_CTL_VP(vp)) { 236 /* if (WRITABLE(flag)) */ 237 if (flag & (FWRITE | O_TRUNC | O_CREAT | O_EXCL)) { 238 MARK_INT_FAIL(CODA_OPEN_STATS); 239 return(EACCES); 240 } 241 MARK_INT_SAT(CODA_OPEN_STATS); 242 return(0); 243 } 244 245 error = venus_open(vtomi(vp), &cp->c_fid, flag, cred, curlwp, &dev, &inode); 246 if (error) 247 return (error); 248 if (!error) { 249 CODADEBUG(CODA_OPEN, myprintf(( 250 "%s: dev 0x%llx inode %llu result %d\n", __func__, 251 (unsigned long long)dev, (unsigned long long)inode, error));) 252 } 253 254 /* 255 * Obtain locked and referenced container vnode from container 256 * device/inode. 257 */ 258 error = coda_grab_vnode(vp, dev, inode, &container_vp); 259 if (error) 260 return (error); 261 262 /* Save the vnode pointer for the container file. */ 263 if (cp->c_ovp == NULL) { 264 cp->c_ovp = container_vp; 265 } else { 266 if (cp->c_ovp != container_vp) 267 /* 268 * Perhaps venus returned a different container, or 269 * something else went wrong. 270 */ 271 panic("%s: cp->c_ovp != container_vp", __func__); 272 } 273 cp->c_ocount++; 274 275 /* Flush the attribute cache if writing the file. */ 276 if (flag & FWRITE) { 277 cp->c_owrite++; 278 cp->c_flags &= ~C_VATTR; 279 } 280 281 /* 282 * Save the <device, inode> pair for the container file to speed 283 * up subsequent reads while closed (mmap, program execution). 284 * This is perhaps safe because venus will invalidate the node 285 * before changing the container file mapping. 286 */ 287 cp->c_device = dev; 288 cp->c_inode = inode; 289 290 /* Open the container file. */ 291 error = VOP_OPEN(container_vp, flag, cred); 292 /* 293 * Drop the lock on the container, after we have done VOP_OPEN 294 * (which requires a locked vnode). 295 */ 296 VOP_UNLOCK(container_vp); 297 return(error); 298 } 299 300 /* 301 * Close the cache file used for I/O and notify Venus. 302 */ 303 int 304 coda_close(void *v) 305 { 306 /* true args */ 307 struct vop_close_args *ap = v; 308 vnode_t *vp = ap->a_vp; 309 struct cnode *cp = VTOC(vp); 310 int flag = ap->a_fflag; 311 kauth_cred_t cred = ap->a_cred; 312 /* locals */ 313 int error; 314 315 MARK_ENTRY(CODA_CLOSE_STATS); 316 317 /* Check for close of control file. */ 318 if (IS_CTL_VP(vp)) { 319 MARK_INT_SAT(CODA_CLOSE_STATS); 320 return(0); 321 } 322 323 /* 324 * XXX The IS_UNMOUNTING part of this is very suspect. 325 */ 326 if (IS_UNMOUNTING(cp)) { 327 if (cp->c_ovp) { 328 #ifdef CODA_VERBOSE 329 printf("%s: destroying container %d, ufs vp %p of vp %p/cp %p\n", 330 __func__, vp->v_usecount, cp->c_ovp, vp, cp); 331 #endif 332 #ifdef hmm 333 vgone(cp->c_ovp); 334 #else 335 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 336 VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ 337 vput(cp->c_ovp); 338 #endif 339 } else { 340 #ifdef CODA_VERBOSE 341 printf("%s: NO container vp %p/cp %p\n", __func__, vp, cp); 342 #endif 343 } 344 return ENODEV; 345 } 346 347 /* Lock the container node, and VOP_CLOSE it. */ 348 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 349 VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ 350 /* 351 * Drop the lock we just obtained, and vrele the container vnode. 352 * Decrement reference counts, and clear container vnode pointer on 353 * last close. 354 */ 355 vput(cp->c_ovp); 356 if (flag & FWRITE) 357 --cp->c_owrite; 358 if (--cp->c_ocount == 0) 359 cp->c_ovp = NULL; 360 361 error = venus_close(vtomi(vp), &cp->c_fid, flag, cred, curlwp); 362 363 CODADEBUG(CODA_CLOSE, myprintf(("%s: result %d\n", __func__, error)); ) 364 return(error); 365 } 366 367 int 368 coda_read(void *v) 369 { 370 struct vop_read_args *ap = v; 371 372 ENTRY; 373 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_READ, 374 ap->a_ioflag, ap->a_cred, curlwp)); 375 } 376 377 int 378 coda_write(void *v) 379 { 380 struct vop_write_args *ap = v; 381 382 ENTRY; 383 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_WRITE, 384 ap->a_ioflag, ap->a_cred, curlwp)); 385 } 386 387 int 388 coda_rdwr(vnode_t *vp, struct uio *uiop, enum uio_rw rw, int ioflag, 389 kauth_cred_t cred, struct lwp *l) 390 { 391 /* upcall decl */ 392 /* NOTE: container file operation!!! */ 393 /* locals */ 394 struct cnode *cp = VTOC(vp); 395 vnode_t *cfvp = cp->c_ovp; 396 struct proc *p = l->l_proc; 397 int opened_internally = 0; 398 int error = 0; 399 400 MARK_ENTRY(CODA_RDWR_STATS); 401 402 CODADEBUG(CODA_RDWR, myprintf(("coda_rdwr(%d, %p, %lu, %lld)\n", rw, 403 uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, 404 (long long) uiop->uio_offset)); ) 405 406 /* Check for rdwr of control object. */ 407 if (IS_CTL_VP(vp)) { 408 MARK_INT_FAIL(CODA_RDWR_STATS); 409 return(EINVAL); 410 } 411 412 /* Redirect the request to UFS. */ 413 414 /* 415 * If file is not already open this must be a page 416 * {read,write} request. Iget the cache file's inode 417 * pointer if we still have its <device, inode> pair. 418 * Otherwise, we must do an internal open to derive the 419 * pair. 420 * XXX Integrate this into a coherent strategy for container 421 * file acquisition. 422 */ 423 if (cfvp == NULL) { 424 /* 425 * If we're dumping core, do the internal open. Otherwise 426 * venus won't have the correct size of the core when 427 * it's completely written. 428 */ 429 if (cp->c_inode != 0 && !(p && (p->p_acflag & ACORE))) { 430 #ifdef CODA_VERBOSE 431 printf("%s: grabbing container vnode, losing reference\n", 432 __func__); 433 #endif 434 /* Get locked and refed vnode. */ 435 error = coda_grab_vnode(vp, cp->c_device, cp->c_inode, &cfvp); 436 if (error) { 437 MARK_INT_FAIL(CODA_RDWR_STATS); 438 return(error); 439 } 440 /* 441 * Drop lock. 442 * XXX Where is reference released. 443 */ 444 VOP_UNLOCK(cfvp); 445 } 446 else { 447 #ifdef CODA_VERBOSE 448 printf("%s: internal VOP_OPEN\n", __func__); 449 #endif 450 opened_internally = 1; 451 MARK_INT_GEN(CODA_OPEN_STATS); 452 error = VOP_OPEN(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); 453 #ifdef CODA_VERBOSE 454 printf("%s: Internally Opening %p\n", __func__, vp); 455 #endif 456 if (error) { 457 MARK_INT_FAIL(CODA_RDWR_STATS); 458 return(error); 459 } 460 cfvp = cp->c_ovp; 461 } 462 } 463 464 /* Have UFS handle the call. */ 465 CODADEBUG(CODA_RDWR, myprintf(("%s: fid = %s, refcnt = %d\n", __func__, 466 coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount)); ) 467 468 if (rw == UIO_READ) { 469 error = VOP_READ(cfvp, uiop, ioflag, cred); 470 } else { 471 error = VOP_WRITE(cfvp, uiop, ioflag, cred); 472 } 473 474 if (error) 475 MARK_INT_FAIL(CODA_RDWR_STATS); 476 else 477 MARK_INT_SAT(CODA_RDWR_STATS); 478 479 /* Do an internal close if necessary. */ 480 if (opened_internally) { 481 MARK_INT_GEN(CODA_CLOSE_STATS); 482 (void)VOP_CLOSE(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); 483 } 484 485 /* Invalidate cached attributes if writing. */ 486 if (rw == UIO_WRITE) 487 cp->c_flags &= ~C_VATTR; 488 return(error); 489 } 490 491 int 492 coda_ioctl(void *v) 493 { 494 /* true args */ 495 struct vop_ioctl_args *ap = v; 496 vnode_t *vp = ap->a_vp; 497 int com = ap->a_command; 498 void *data = ap->a_data; 499 int flag = ap->a_fflag; 500 kauth_cred_t cred = ap->a_cred; 501 /* locals */ 502 int error; 503 vnode_t *tvp; 504 struct PioctlData *iap = (struct PioctlData *)data; 505 namei_simple_flags_t sflags; 506 507 MARK_ENTRY(CODA_IOCTL_STATS); 508 509 CODADEBUG(CODA_IOCTL, myprintf(("in coda_ioctl on %s\n", iap->path));) 510 511 /* Don't check for operation on a dying object, for ctlvp it 512 shouldn't matter */ 513 514 /* Must be control object to succeed. */ 515 if (!IS_CTL_VP(vp)) { 516 MARK_INT_FAIL(CODA_IOCTL_STATS); 517 CODADEBUG(CODA_IOCTL, myprintf(("%s error: vp != ctlvp", __func__));) 518 return (EOPNOTSUPP); 519 } 520 /* Look up the pathname. */ 521 522 /* Should we use the name cache here? It would get it from 523 lookupname sooner or later anyway, right? */ 524 525 sflags = iap->follow ? NSM_FOLLOW_NOEMULROOT : NSM_NOFOLLOW_NOEMULROOT; 526 error = namei_simple_user(iap->path, sflags, &tvp); 527 528 if (error) { 529 MARK_INT_FAIL(CODA_IOCTL_STATS); 530 CODADEBUG(CODA_IOCTL, myprintf(("%s error: lookup returns %d\n", 531 __func__, error));) 532 return(error); 533 } 534 535 /* 536 * Make sure this is a coda style cnode, but it may be a 537 * different vfsp 538 */ 539 /* XXX: this totally violates the comment about vtagtype in vnode.h */ 540 if (tvp->v_tag != VT_CODA) { 541 vrele(tvp); 542 MARK_INT_FAIL(CODA_IOCTL_STATS); 543 CODADEBUG(CODA_IOCTL, myprintf(("%s error: %s not a coda object\n", 544 __func__, iap->path));) 545 return(EINVAL); 546 } 547 548 if (iap->vi.in_size > VC_MAXDATASIZE || iap->vi.out_size > VC_MAXDATASIZE) { 549 vrele(tvp); 550 return(EINVAL); 551 } 552 error = venus_ioctl(vtomi(tvp), &((VTOC(tvp))->c_fid), com, flag, data, 553 cred, curlwp); 554 555 if (error) 556 MARK_INT_FAIL(CODA_IOCTL_STATS); 557 else 558 CODADEBUG(CODA_IOCTL, myprintf(("Ioctl returns %d \n", error)); ) 559 560 vrele(tvp); 561 return(error); 562 } 563 564 /* 565 * To reduce the cost of a user-level venus;we cache attributes in 566 * the kernel. Each cnode has storage allocated for an attribute. If 567 * c_vattr is valid, return a reference to it. Otherwise, get the 568 * attributes from venus and store them in the cnode. There is some 569 * question if this method is a security leak. But I think that in 570 * order to make this call, the user must have done a lookup and 571 * opened the file, and therefore should already have access. 572 */ 573 int 574 coda_getattr(void *v) 575 { 576 /* true args */ 577 struct vop_getattr_args *ap = v; 578 vnode_t *vp = ap->a_vp; 579 struct cnode *cp = VTOC(vp); 580 struct vattr *vap = ap->a_vap; 581 kauth_cred_t cred = ap->a_cred; 582 /* locals */ 583 int error; 584 585 MARK_ENTRY(CODA_GETATTR_STATS); 586 587 /* Check for getattr of control object. */ 588 if (IS_CTL_VP(vp)) { 589 MARK_INT_FAIL(CODA_GETATTR_STATS); 590 return(ENOENT); 591 } 592 593 /* Check to see if the attributes have already been cached */ 594 if (VALID_VATTR(cp)) { 595 CODADEBUG(CODA_GETATTR, { myprintf(("%s: attr cache hit: %s\n", 596 __func__, coda_f2s(&cp->c_fid)));}) 597 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 598 coda_print_vattr(&cp->c_vattr); ) 599 600 *vap = cp->c_vattr; 601 MARK_INT_SAT(CODA_GETATTR_STATS); 602 return(0); 603 } 604 605 error = venus_getattr(vtomi(vp), &cp->c_fid, cred, curlwp, vap); 606 607 if (!error) { 608 CODADEBUG(CODA_GETATTR, myprintf(("%s miss %s: result %d\n", 609 __func__, coda_f2s(&cp->c_fid), error)); ) 610 611 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 612 coda_print_vattr(vap); ) 613 614 /* If not open for write, store attributes in cnode */ 615 if ((cp->c_owrite == 0) && (coda_attr_cache)) { 616 cp->c_vattr = *vap; 617 cp->c_flags |= C_VATTR; 618 } 619 620 } 621 return(error); 622 } 623 624 int 625 coda_setattr(void *v) 626 { 627 /* true args */ 628 struct vop_setattr_args *ap = v; 629 vnode_t *vp = ap->a_vp; 630 struct cnode *cp = VTOC(vp); 631 struct vattr *vap = ap->a_vap; 632 kauth_cred_t cred = ap->a_cred; 633 /* locals */ 634 int error; 635 636 MARK_ENTRY(CODA_SETATTR_STATS); 637 638 /* Check for setattr of control object. */ 639 if (IS_CTL_VP(vp)) { 640 MARK_INT_FAIL(CODA_SETATTR_STATS); 641 return(ENOENT); 642 } 643 644 if (codadebug & CODADBGMSK(CODA_SETATTR)) { 645 coda_print_vattr(vap); 646 } 647 error = venus_setattr(vtomi(vp), &cp->c_fid, vap, cred, curlwp); 648 649 if (!error) 650 cp->c_flags &= ~C_VATTR; 651 652 CODADEBUG(CODA_SETATTR, myprintf(("setattr %d\n", error)); ) 653 return(error); 654 } 655 656 int 657 coda_access(void *v) 658 { 659 /* true args */ 660 struct vop_access_args *ap = v; 661 vnode_t *vp = ap->a_vp; 662 struct cnode *cp = VTOC(vp); 663 int mode = ap->a_mode; 664 kauth_cred_t cred = ap->a_cred; 665 /* locals */ 666 int error; 667 668 MARK_ENTRY(CODA_ACCESS_STATS); 669 670 /* Check for access of control object. Only read access is 671 allowed on it. */ 672 if (IS_CTL_VP(vp)) { 673 /* bogus hack - all will be marked as successes */ 674 MARK_INT_SAT(CODA_ACCESS_STATS); 675 return(((mode & VREAD) && !(mode & (VWRITE | VEXEC))) 676 ? 0 : EACCES); 677 } 678 679 /* 680 * if the file is a directory, and we are checking exec (eg lookup) 681 * access, and the file is in the namecache, then the user must have 682 * lookup access to it. 683 */ 684 if (coda_access_cache) { 685 if ((vp->v_type == VDIR) && (mode & VEXEC)) { 686 if (coda_nc_lookup(cp, ".", 1, cred)) { 687 MARK_INT_SAT(CODA_ACCESS_STATS); 688 return(0); /* it was in the cache */ 689 } 690 } 691 } 692 693 error = venus_access(vtomi(vp), &cp->c_fid, mode, cred, curlwp); 694 695 return(error); 696 } 697 698 /* 699 * CODA abort op, called after namei() when a CREATE/DELETE isn't actually 700 * done. If a buffer has been saved in anticipation of a coda_create or 701 * a coda_remove, delete it. 702 */ 703 /* ARGSUSED */ 704 int 705 coda_abortop(void *v) 706 { 707 /* true args */ 708 struct vop_abortop_args /* { 709 vnode_t *a_dvp; 710 struct componentname *a_cnp; 711 } */ *ap = v; 712 713 (void)ap; 714 /* upcall decl */ 715 /* locals */ 716 717 return (0); 718 } 719 720 int 721 coda_readlink(void *v) 722 { 723 /* true args */ 724 struct vop_readlink_args *ap = v; 725 vnode_t *vp = ap->a_vp; 726 struct cnode *cp = VTOC(vp); 727 struct uio *uiop = ap->a_uio; 728 kauth_cred_t cred = ap->a_cred; 729 /* locals */ 730 struct lwp *l = curlwp; 731 int error; 732 char *str; 733 int len; 734 735 MARK_ENTRY(CODA_READLINK_STATS); 736 737 /* Check for readlink of control object. */ 738 if (IS_CTL_VP(vp)) { 739 MARK_INT_FAIL(CODA_READLINK_STATS); 740 return(ENOENT); 741 } 742 743 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { /* symlink was cached */ 744 uiop->uio_rw = UIO_READ; 745 error = uiomove(cp->c_symlink, (int)cp->c_symlen, uiop); 746 if (error) 747 MARK_INT_FAIL(CODA_READLINK_STATS); 748 else 749 MARK_INT_SAT(CODA_READLINK_STATS); 750 return(error); 751 } 752 753 error = venus_readlink(vtomi(vp), &cp->c_fid, cred, l, &str, &len); 754 755 if (!error) { 756 uiop->uio_rw = UIO_READ; 757 error = uiomove(str, len, uiop); 758 759 if (coda_symlink_cache) { 760 cp->c_symlink = str; 761 cp->c_symlen = len; 762 cp->c_flags |= C_SYMLINK; 763 } else 764 CODA_FREE(str, len); 765 } 766 767 CODADEBUG(CODA_READLINK, myprintf(("in readlink result %d\n",error));) 768 return(error); 769 } 770 771 int 772 coda_fsync(void *v) 773 { 774 /* true args */ 775 struct vop_fsync_args *ap = v; 776 vnode_t *vp = ap->a_vp; 777 struct cnode *cp = VTOC(vp); 778 kauth_cred_t cred = ap->a_cred; 779 /* locals */ 780 vnode_t *convp = cp->c_ovp; 781 int error; 782 783 MARK_ENTRY(CODA_FSYNC_STATS); 784 785 /* Check for fsync on an unmounting object */ 786 /* The NetBSD kernel, in it's infinite wisdom, can try to fsync 787 * after an unmount has been initiated. This is a Bad Thing, 788 * which we have to avoid. Not a legitimate failure for stats. 789 */ 790 if (IS_UNMOUNTING(cp)) { 791 return(ENODEV); 792 } 793 794 /* Check for fsync of control object. */ 795 if (IS_CTL_VP(vp)) { 796 MARK_INT_SAT(CODA_FSYNC_STATS); 797 return(0); 798 } 799 800 if (convp) 801 VOP_FSYNC(convp, cred, MNT_WAIT, 0, 0); 802 803 /* 804 * We can expect fsync on any vnode at all if venus is pruging it. 805 * Venus can't very well answer the fsync request, now can it? 806 * Hopefully, it won't have to, because hopefully, venus preserves 807 * the (possibly untrue) invariant that it never purges an open 808 * vnode. Hopefully. 809 */ 810 if (cp->c_flags & C_PURGING) { 811 return(0); 812 } 813 814 error = venus_fsync(vtomi(vp), &cp->c_fid, cred, curlwp); 815 816 CODADEBUG(CODA_FSYNC, myprintf(("in fsync result %d\n",error)); ) 817 return(error); 818 } 819 820 /* 821 * vp is locked on entry, and we must unlock it. 822 * XXX This routine is suspect and probably needs rewriting. 823 */ 824 int 825 coda_inactive(void *v) 826 { 827 /* true args */ 828 struct vop_inactive_args *ap = v; 829 vnode_t *vp = ap->a_vp; 830 struct cnode *cp = VTOC(vp); 831 kauth_cred_t cred __unused = NULL; 832 833 /* We don't need to send inactive to venus - DCS */ 834 MARK_ENTRY(CODA_INACTIVE_STATS); 835 836 if (IS_CTL_VP(vp)) { 837 MARK_INT_SAT(CODA_INACTIVE_STATS); 838 return 0; 839 } 840 841 CODADEBUG(CODA_INACTIVE, myprintf(("in inactive, %s, vfsp %p\n", 842 coda_f2s(&cp->c_fid), vp->v_mount));) 843 844 /* If an array has been allocated to hold the symlink, deallocate it */ 845 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { 846 if (cp->c_symlink == NULL) 847 panic("%s: null symlink pointer in cnode", __func__); 848 849 CODA_FREE(cp->c_symlink, cp->c_symlen); 850 cp->c_flags &= ~C_SYMLINK; 851 cp->c_symlen = 0; 852 } 853 854 /* Remove it from the table so it can't be found. */ 855 coda_unsave(cp); 856 if (vp->v_mount->mnt_data == NULL) { 857 myprintf(("Help! vfsp->vfs_data was NULL, but vnode %p wasn't dying\n", vp)); 858 panic("badness in coda_inactive"); 859 } 860 861 #ifdef CODA_VERBOSE 862 /* Sanity checks that perhaps should be panic. */ 863 if (vp->v_usecount > 1) 864 printf("%s: %p usecount %d\n", __func__, vp, vp->v_usecount); 865 if (cp->c_ovp != NULL) 866 printf("%s: %p ovp != NULL\n", __func__, vp); 867 #endif 868 /* XXX Do we need to VOP_CLOSE container vnodes? */ 869 VOP_UNLOCK(vp); 870 if (!IS_UNMOUNTING(cp)) 871 *ap->a_recycle = true; 872 873 MARK_INT_SAT(CODA_INACTIVE_STATS); 874 return(0); 875 } 876 877 /* 878 * Coda does not use the normal namecache, but a private version. 879 * Consider how to use the standard facility instead. 880 */ 881 int 882 coda_lookup(void *v) 883 { 884 /* true args */ 885 struct vop_lookup_args *ap = v; 886 /* (locked) vnode of dir in which to do lookup */ 887 vnode_t *dvp = ap->a_dvp; 888 struct cnode *dcp = VTOC(dvp); 889 /* output variable for result */ 890 vnode_t **vpp = ap->a_vpp; 891 /* name to lookup */ 892 struct componentname *cnp = ap->a_cnp; 893 kauth_cred_t cred = cnp->cn_cred; 894 struct lwp *l = curlwp; 895 /* locals */ 896 struct cnode *cp; 897 const char *nm = cnp->cn_nameptr; 898 int len = cnp->cn_namelen; 899 int flags = cnp->cn_flags; 900 CodaFid VFid; 901 int vtype; 902 int error = 0; 903 904 MARK_ENTRY(CODA_LOOKUP_STATS); 905 906 CODADEBUG(CODA_LOOKUP, myprintf(("%s: %s in %s\n", __func__, 907 nm, coda_f2s(&dcp->c_fid)));) 908 909 /* 910 * XXX componentname flags in MODMASK are not handled at all 911 */ 912 913 /* 914 * The overall strategy is to switch on the lookup type and get a 915 * result vnode that is vref'd but not locked. Then, the code at 916 * exit: switches on ., .., and regular lookups and does the right 917 * locking. 918 */ 919 920 /* Check for lookup of control object. */ 921 if (IS_CTL_NAME(dvp, nm, len)) { 922 *vpp = coda_ctlvp; 923 vref(*vpp); 924 MARK_INT_SAT(CODA_LOOKUP_STATS); 925 goto exit; 926 } 927 928 /* Avoid trying to hand venus an unreasonably long name. */ 929 if (len+1 > CODA_MAXNAMLEN) { 930 MARK_INT_FAIL(CODA_LOOKUP_STATS); 931 CODADEBUG(CODA_LOOKUP, myprintf(("%s: name too long:, %s (%s)\n", 932 __func__, coda_f2s(&dcp->c_fid), nm));) 933 *vpp = (vnode_t *)0; 934 error = EINVAL; 935 goto exit; 936 } 937 938 /* 939 * Try to resolve the lookup in the minicache. If that fails, ask 940 * venus to do the lookup. XXX The interaction between vnode 941 * locking and any locking that coda does is not clear. 942 */ 943 cp = coda_nc_lookup(dcp, nm, len, cred); 944 if (cp) { 945 *vpp = CTOV(cp); 946 vref(*vpp); 947 CODADEBUG(CODA_LOOKUP, 948 myprintf(("lookup result %d vpp %p\n",error,*vpp));) 949 } else { 950 /* The name wasn't cached, so ask Venus. */ 951 error = venus_lookup(vtomi(dvp), &dcp->c_fid, nm, len, cred, l, &VFid, 952 &vtype); 953 954 if (error) { 955 MARK_INT_FAIL(CODA_LOOKUP_STATS); 956 CODADEBUG(CODA_LOOKUP, myprintf(("%s: lookup error on %s (%s)%d\n", 957 __func__, coda_f2s(&dcp->c_fid), nm, error));) 958 *vpp = (vnode_t *)0; 959 } else { 960 MARK_INT_SAT(CODA_LOOKUP_STATS); 961 CODADEBUG(CODA_LOOKUP, myprintf(("%s: %s type %o result %d\n", 962 __func__, coda_f2s(&VFid), vtype, error)); ) 963 964 cp = make_coda_node(&VFid, dvp->v_mount, vtype); 965 *vpp = CTOV(cp); 966 /* vpp is now vrefed. */ 967 968 /* 969 * Unless this vnode is marked CODA_NOCACHE, enter it into 970 * the coda name cache to avoid a future venus round-trip. 971 * XXX Interaction with componentname NOCACHE is unclear. 972 */ 973 if (!(vtype & CODA_NOCACHE)) 974 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 975 } 976 } 977 978 exit: 979 /* 980 * If we are creating, and this was the last name to be looked up, 981 * and the error was ENOENT, then make the leaf NULL and return 982 * success. 983 * XXX Check against new lookup rules. 984 */ 985 if (((cnp->cn_nameiop == CREATE) || (cnp->cn_nameiop == RENAME)) 986 && (cnp->cn_flags & ISLASTCN) 987 && (error == ENOENT)) 988 { 989 error = EJUSTRETURN; 990 *ap->a_vpp = NULL; 991 } 992 993 /* 994 * If the lookup succeeded, we must generally lock the returned 995 * vnode. This could be a ., .., or normal lookup. See 996 * vnodeops(9) for the details. 997 */ 998 /* 999 * XXX LK_RETRY is likely incorrect. Handle vn_lock failure 1000 * somehow, and remove LK_RETRY. 1001 */ 1002 if (!error || (error == EJUSTRETURN)) { 1003 /* Lookup has a value and it isn't "."? */ 1004 if (*ap->a_vpp && (*ap->a_vpp != dvp)) { 1005 if (flags & ISDOTDOT) 1006 /* ..: unlock parent */ 1007 VOP_UNLOCK(dvp); 1008 /* all but .: lock child */ 1009 vn_lock(*ap->a_vpp, LK_EXCLUSIVE | LK_RETRY); 1010 if (flags & ISDOTDOT) 1011 /* ..: relock parent */ 1012 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1013 } 1014 /* else .: leave dvp locked */ 1015 } else { 1016 /* The lookup failed, so return NULL. Leave dvp locked. */ 1017 *ap->a_vpp = NULL; 1018 } 1019 return(error); 1020 } 1021 1022 /*ARGSUSED*/ 1023 int 1024 coda_create(void *v) 1025 { 1026 /* true args */ 1027 struct vop_create_args *ap = v; 1028 vnode_t *dvp = ap->a_dvp; 1029 struct cnode *dcp = VTOC(dvp); 1030 struct vattr *va = ap->a_vap; 1031 int exclusive = 1; 1032 int mode = ap->a_vap->va_mode; 1033 vnode_t **vpp = ap->a_vpp; 1034 struct componentname *cnp = ap->a_cnp; 1035 kauth_cred_t cred = cnp->cn_cred; 1036 struct lwp *l = curlwp; 1037 /* locals */ 1038 int error; 1039 struct cnode *cp; 1040 const char *nm = cnp->cn_nameptr; 1041 int len = cnp->cn_namelen; 1042 CodaFid VFid; 1043 struct vattr attr; 1044 1045 MARK_ENTRY(CODA_CREATE_STATS); 1046 1047 /* All creates are exclusive XXX */ 1048 /* I'm assuming the 'mode' argument is the file mode bits XXX */ 1049 1050 /* Check for create of control object. */ 1051 if (IS_CTL_NAME(dvp, nm, len)) { 1052 *vpp = (vnode_t *)0; 1053 MARK_INT_FAIL(CODA_CREATE_STATS); 1054 return(EACCES); 1055 } 1056 1057 error = venus_create(vtomi(dvp), &dcp->c_fid, nm, len, exclusive, mode, va, cred, l, &VFid, &attr); 1058 1059 if (!error) { 1060 1061 /* 1062 * XXX Violation of venus/kernel invariants is a difficult case, 1063 * but venus should not be able to cause a panic. 1064 */ 1065 /* If this is an exclusive create, panic if the file already exists. */ 1066 /* Venus should have detected the file and reported EEXIST. */ 1067 1068 if ((exclusive == 1) && 1069 (coda_find(&VFid) != NULL)) 1070 panic("cnode existed for newly created file!"); 1071 1072 cp = make_coda_node(&VFid, dvp->v_mount, attr.va_type); 1073 *vpp = CTOV(cp); 1074 1075 /* XXX vnodeops doesn't say this argument can be changed. */ 1076 /* Update va to reflect the new attributes. */ 1077 (*va) = attr; 1078 1079 /* Update the attribute cache and mark it as valid */ 1080 if (coda_attr_cache) { 1081 VTOC(*vpp)->c_vattr = attr; 1082 VTOC(*vpp)->c_flags |= C_VATTR; 1083 } 1084 1085 /* Invalidate parent's attr cache (modification time has changed). */ 1086 VTOC(dvp)->c_flags &= ~C_VATTR; 1087 1088 /* enter the new vnode in the Name Cache */ 1089 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1090 1091 CODADEBUG(CODA_CREATE, myprintf(("%s: %s, result %d\n", __func__, 1092 coda_f2s(&VFid), error)); ) 1093 } else { 1094 *vpp = (vnode_t *)0; 1095 CODADEBUG(CODA_CREATE, myprintf(("%s: create error %d\n", __func__, 1096 error));) 1097 } 1098 1099 /* 1100 * vnodeops(9) says that we must unlock the parent and lock the child. 1101 * XXX Should we lock the child first? 1102 */ 1103 vput(dvp); 1104 if (!error) { 1105 #ifdef CODA_VERBOSE 1106 if ((cnp->cn_flags & LOCKLEAF) == 0) 1107 /* This should not happen; flags are for lookup only. */ 1108 printf("%s: LOCKLEAF not set!\n", __func__); 1109 1110 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) 1111 /* XXX Perhaps avoid this panic. */ 1112 panic("%s: couldn't lock child", __func__); 1113 #endif 1114 } 1115 1116 return(error); 1117 } 1118 1119 int 1120 coda_remove(void *v) 1121 { 1122 /* true args */ 1123 struct vop_remove_args *ap = v; 1124 vnode_t *dvp = ap->a_dvp; 1125 struct cnode *cp = VTOC(dvp); 1126 vnode_t *vp = ap->a_vp; 1127 struct componentname *cnp = ap->a_cnp; 1128 kauth_cred_t cred = cnp->cn_cred; 1129 struct lwp *l = curlwp; 1130 /* locals */ 1131 int error; 1132 const char *nm = cnp->cn_nameptr; 1133 int len = cnp->cn_namelen; 1134 struct cnode *tp; 1135 1136 MARK_ENTRY(CODA_REMOVE_STATS); 1137 1138 CODADEBUG(CODA_REMOVE, myprintf(("%s: %s in %s\n", __func__, 1139 nm, coda_f2s(&cp->c_fid)));) 1140 1141 /* Remove the file's entry from the CODA Name Cache */ 1142 /* We're being conservative here, it might be that this person 1143 * doesn't really have sufficient access to delete the file 1144 * but we feel zapping the entry won't really hurt anyone -- dcs 1145 */ 1146 /* I'm gonna go out on a limb here. If a file and a hardlink to it 1147 * exist, and one is removed, the link count on the other will be 1148 * off by 1. We could either invalidate the attrs if cached, or 1149 * fix them. I'll try to fix them. DCS 11/8/94 1150 */ 1151 tp = coda_nc_lookup(VTOC(dvp), nm, len, cred); 1152 if (tp) { 1153 if (VALID_VATTR(tp)) { /* If attrs are cached */ 1154 if (tp->c_vattr.va_nlink > 1) { /* If it's a hard link */ 1155 tp->c_vattr.va_nlink--; 1156 } 1157 } 1158 1159 coda_nc_zapfile(VTOC(dvp), nm, len); 1160 /* No need to flush it if it doesn't exist! */ 1161 } 1162 /* Invalidate the parent's attr cache, the modification time has changed */ 1163 VTOC(dvp)->c_flags &= ~C_VATTR; 1164 1165 /* Check for remove of control object. */ 1166 if (IS_CTL_NAME(dvp, nm, len)) { 1167 MARK_INT_FAIL(CODA_REMOVE_STATS); 1168 return(ENOENT); 1169 } 1170 1171 error = venus_remove(vtomi(dvp), &cp->c_fid, nm, len, cred, l); 1172 1173 CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n",error)); ) 1174 1175 /* 1176 * Unlock parent and child (avoiding double if "."). 1177 */ 1178 if (dvp == vp) { 1179 vrele(vp); 1180 } else { 1181 vput(vp); 1182 } 1183 vput(dvp); 1184 1185 return(error); 1186 } 1187 1188 /* 1189 * dvp is the directory where the link is to go, and is locked. 1190 * vp is the object to be linked to, and is unlocked. 1191 * At exit, we must unlock dvp, and vput dvp. 1192 */ 1193 int 1194 coda_link(void *v) 1195 { 1196 /* true args */ 1197 struct vop_link_args *ap = v; 1198 vnode_t *vp = ap->a_vp; 1199 struct cnode *cp = VTOC(vp); 1200 vnode_t *dvp = ap->a_dvp; 1201 struct cnode *dcp = VTOC(dvp); 1202 struct componentname *cnp = ap->a_cnp; 1203 kauth_cred_t cred = cnp->cn_cred; 1204 struct lwp *l = curlwp; 1205 /* locals */ 1206 int error; 1207 const char *nm = cnp->cn_nameptr; 1208 int len = cnp->cn_namelen; 1209 1210 MARK_ENTRY(CODA_LINK_STATS); 1211 1212 if (codadebug & CODADBGMSK(CODA_LINK)) { 1213 1214 myprintf(("%s: vp fid: %s\n", __func__, coda_f2s(&cp->c_fid))); 1215 myprintf(("%s: dvp fid: %s)\n", __func__, coda_f2s(&dcp->c_fid))); 1216 1217 } 1218 if (codadebug & CODADBGMSK(CODA_LINK)) { 1219 myprintf(("%s: vp fid: %s\n", __func__, coda_f2s(&cp->c_fid))); 1220 myprintf(("%s: dvp fid: %s\n", __func__, coda_f2s(&dcp->c_fid))); 1221 1222 } 1223 1224 /* Check for link to/from control object. */ 1225 if (IS_CTL_NAME(dvp, nm, len) || IS_CTL_VP(vp)) { 1226 MARK_INT_FAIL(CODA_LINK_STATS); 1227 return(EACCES); 1228 } 1229 1230 /* If linking . to a name, error out earlier. */ 1231 if (vp == dvp) { 1232 #ifdef CODA_VERBOSE 1233 printf("%s coda_link vp==dvp\n", __func__); 1234 #endif 1235 error = EISDIR; 1236 goto exit; 1237 } 1238 1239 /* XXX Why does venus_link need the vnode to be locked?*/ 1240 if ((error = vn_lock(vp, LK_EXCLUSIVE)) != 0) { 1241 #ifdef CODA_VERBOSE 1242 printf("%s: couldn't lock vnode %p\n", __func__, vp); 1243 #endif 1244 error = EFAULT; /* XXX better value */ 1245 goto exit; 1246 } 1247 error = venus_link(vtomi(vp), &cp->c_fid, &dcp->c_fid, nm, len, cred, l); 1248 VOP_UNLOCK(vp); 1249 1250 /* Invalidate parent's attr cache (the modification time has changed). */ 1251 VTOC(dvp)->c_flags &= ~C_VATTR; 1252 /* Invalidate child's attr cache (XXX why). */ 1253 VTOC(vp)->c_flags &= ~C_VATTR; 1254 1255 CODADEBUG(CODA_LINK, myprintf(("in link result %d\n",error)); ) 1256 1257 exit: 1258 vput(dvp); 1259 return(error); 1260 } 1261 1262 int 1263 coda_rename(void *v) 1264 { 1265 /* true args */ 1266 struct vop_rename_args *ap = v; 1267 vnode_t *odvp = ap->a_fdvp; 1268 struct cnode *odcp = VTOC(odvp); 1269 struct componentname *fcnp = ap->a_fcnp; 1270 vnode_t *ndvp = ap->a_tdvp; 1271 struct cnode *ndcp = VTOC(ndvp); 1272 struct componentname *tcnp = ap->a_tcnp; 1273 kauth_cred_t cred = fcnp->cn_cred; 1274 struct lwp *l = curlwp; 1275 /* true args */ 1276 int error; 1277 const char *fnm = fcnp->cn_nameptr; 1278 int flen = fcnp->cn_namelen; 1279 const char *tnm = tcnp->cn_nameptr; 1280 int tlen = tcnp->cn_namelen; 1281 1282 MARK_ENTRY(CODA_RENAME_STATS); 1283 1284 /* Hmmm. The vnodes are already looked up. Perhaps they are locked? 1285 This could be Bad. XXX */ 1286 #ifdef OLD_DIAGNOSTIC 1287 if ((fcnp->cn_cred != tcnp->cn_cred) 1288 || (fcnp->cn_lwp != tcnp->cn_lwp)) 1289 { 1290 panic("%s: component names don't agree", __func__); 1291 } 1292 #endif 1293 1294 /* Check for rename involving control object. */ 1295 if (IS_CTL_NAME(odvp, fnm, flen) || IS_CTL_NAME(ndvp, tnm, tlen)) { 1296 MARK_INT_FAIL(CODA_RENAME_STATS); 1297 return(EACCES); 1298 } 1299 1300 /* Problem with moving directories -- need to flush entry for .. */ 1301 if (odvp != ndvp) { 1302 struct cnode *ovcp = coda_nc_lookup(VTOC(odvp), fnm, flen, cred); 1303 if (ovcp) { 1304 vnode_t *ovp = CTOV(ovcp); 1305 if ((ovp) && 1306 (ovp->v_type == VDIR)) /* If it's a directory */ 1307 coda_nc_zapfile(VTOC(ovp),"..", 2); 1308 } 1309 } 1310 1311 /* Remove the entries for both source and target files */ 1312 coda_nc_zapfile(VTOC(odvp), fnm, flen); 1313 coda_nc_zapfile(VTOC(ndvp), tnm, tlen); 1314 1315 /* Invalidate the parent's attr cache, the modification time has changed */ 1316 VTOC(odvp)->c_flags &= ~C_VATTR; 1317 VTOC(ndvp)->c_flags &= ~C_VATTR; 1318 1319 if (flen+1 > CODA_MAXNAMLEN) { 1320 MARK_INT_FAIL(CODA_RENAME_STATS); 1321 error = EINVAL; 1322 goto exit; 1323 } 1324 1325 if (tlen+1 > CODA_MAXNAMLEN) { 1326 MARK_INT_FAIL(CODA_RENAME_STATS); 1327 error = EINVAL; 1328 goto exit; 1329 } 1330 1331 error = venus_rename(vtomi(odvp), &odcp->c_fid, &ndcp->c_fid, fnm, flen, tnm, tlen, cred, l); 1332 1333 exit: 1334 CODADEBUG(CODA_RENAME, myprintf(("in rename result %d\n",error));) 1335 /* XXX - do we need to call cache pureg on the moved vnode? */ 1336 cache_purge(ap->a_fvp); 1337 1338 /* It seems to be incumbent on us to drop locks on all four vnodes */ 1339 /* From-vnodes are not locked, only ref'd. To-vnodes are locked. */ 1340 1341 vrele(ap->a_fvp); 1342 vrele(odvp); 1343 1344 if (ap->a_tvp) { 1345 if (ap->a_tvp == ndvp) { 1346 vrele(ap->a_tvp); 1347 } else { 1348 vput(ap->a_tvp); 1349 } 1350 } 1351 1352 vput(ndvp); 1353 return(error); 1354 } 1355 1356 int 1357 coda_mkdir(void *v) 1358 { 1359 /* true args */ 1360 struct vop_mkdir_args *ap = v; 1361 vnode_t *dvp = ap->a_dvp; 1362 struct cnode *dcp = VTOC(dvp); 1363 struct componentname *cnp = ap->a_cnp; 1364 struct vattr *va = ap->a_vap; 1365 vnode_t **vpp = ap->a_vpp; 1366 kauth_cred_t cred = cnp->cn_cred; 1367 struct lwp *l = curlwp; 1368 /* locals */ 1369 int error; 1370 const char *nm = cnp->cn_nameptr; 1371 int len = cnp->cn_namelen; 1372 struct cnode *cp; 1373 CodaFid VFid; 1374 struct vattr ova; 1375 1376 MARK_ENTRY(CODA_MKDIR_STATS); 1377 1378 /* Check for mkdir of target object. */ 1379 if (IS_CTL_NAME(dvp, nm, len)) { 1380 *vpp = (vnode_t *)0; 1381 MARK_INT_FAIL(CODA_MKDIR_STATS); 1382 return(EACCES); 1383 } 1384 1385 if (len+1 > CODA_MAXNAMLEN) { 1386 *vpp = (vnode_t *)0; 1387 MARK_INT_FAIL(CODA_MKDIR_STATS); 1388 return(EACCES); 1389 } 1390 1391 error = venus_mkdir(vtomi(dvp), &dcp->c_fid, nm, len, va, cred, l, &VFid, &ova); 1392 1393 if (!error) { 1394 if (coda_find(&VFid) != NULL) 1395 panic("cnode existed for newly created directory!"); 1396 1397 1398 cp = make_coda_node(&VFid, dvp->v_mount, va->va_type); 1399 *vpp = CTOV(cp); 1400 1401 /* enter the new vnode in the Name Cache */ 1402 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1403 1404 /* as a side effect, enter "." and ".." for the directory */ 1405 coda_nc_enter(VTOC(*vpp), ".", 1, cred, VTOC(*vpp)); 1406 coda_nc_enter(VTOC(*vpp), "..", 2, cred, VTOC(dvp)); 1407 1408 if (coda_attr_cache) { 1409 VTOC(*vpp)->c_vattr = ova; /* update the attr cache */ 1410 VTOC(*vpp)->c_flags |= C_VATTR; /* Valid attributes in cnode */ 1411 } 1412 1413 /* Invalidate the parent's attr cache, the modification time has changed */ 1414 VTOC(dvp)->c_flags &= ~C_VATTR; 1415 1416 CODADEBUG( CODA_MKDIR, myprintf(("%s: %s result %d\n", __func__, 1417 coda_f2s(&VFid), error)); ) 1418 } else { 1419 *vpp = (vnode_t *)0; 1420 CODADEBUG(CODA_MKDIR, myprintf(("%s error %d\n", __func__, error));) 1421 } 1422 1423 /* 1424 * Currently, all mkdirs explicitly vput their dvp's. 1425 * It also appears that we *must* lock the vpp, since 1426 * lockleaf isn't set, but someone down the road is going 1427 * to try to unlock the new directory. 1428 */ 1429 vput(dvp); 1430 if (!error) { 1431 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { 1432 panic("%s: couldn't lock child", __func__); 1433 } 1434 } 1435 1436 return(error); 1437 } 1438 1439 int 1440 coda_rmdir(void *v) 1441 { 1442 /* true args */ 1443 struct vop_rmdir_args *ap = v; 1444 vnode_t *dvp = ap->a_dvp; 1445 struct cnode *dcp = VTOC(dvp); 1446 vnode_t *vp = ap->a_vp; 1447 struct componentname *cnp = ap->a_cnp; 1448 kauth_cred_t cred = cnp->cn_cred; 1449 struct lwp *l = curlwp; 1450 /* true args */ 1451 int error; 1452 const char *nm = cnp->cn_nameptr; 1453 int len = cnp->cn_namelen; 1454 struct cnode *cp; 1455 1456 MARK_ENTRY(CODA_RMDIR_STATS); 1457 1458 /* Check for rmdir of control object. */ 1459 if (IS_CTL_NAME(dvp, nm, len)) { 1460 MARK_INT_FAIL(CODA_RMDIR_STATS); 1461 return(ENOENT); 1462 } 1463 1464 /* Can't remove . in self. */ 1465 if (dvp == vp) { 1466 #ifdef CODA_VERBOSE 1467 printf("%s: dvp == vp\n", __func__); 1468 #endif 1469 error = EINVAL; 1470 goto exit; 1471 } 1472 1473 /* 1474 * The caller may not have adequate permissions, and the venus 1475 * operation may fail, but it doesn't hurt from a correctness 1476 * viewpoint to invalidate cache entries. 1477 * XXX Why isn't this done after the venus_rmdir call? 1478 */ 1479 /* Look up child in name cache (by name, from parent). */ 1480 cp = coda_nc_lookup(dcp, nm, len, cred); 1481 /* If found, remove all children of the child (., ..). */ 1482 if (cp) coda_nc_zapParentfid(&(cp->c_fid), NOT_DOWNCALL); 1483 1484 /* Remove child's own entry. */ 1485 coda_nc_zapfile(dcp, nm, len); 1486 1487 /* Invalidate parent's attr cache (the modification time has changed). */ 1488 dcp->c_flags &= ~C_VATTR; 1489 1490 error = venus_rmdir(vtomi(dvp), &dcp->c_fid, nm, len, cred, l); 1491 1492 CODADEBUG(CODA_RMDIR, myprintf(("in rmdir result %d\n", error)); ) 1493 1494 exit: 1495 /* vput both vnodes */ 1496 vput(dvp); 1497 if (dvp == vp) { 1498 vrele(vp); 1499 } else { 1500 vput(vp); 1501 } 1502 1503 return(error); 1504 } 1505 1506 int 1507 coda_symlink(void *v) 1508 { 1509 /* true args */ 1510 struct vop_symlink_args *ap = v; 1511 vnode_t *dvp = ap->a_dvp; 1512 struct cnode *dcp = VTOC(dvp); 1513 /* a_vpp is used in place below */ 1514 struct componentname *cnp = ap->a_cnp; 1515 struct vattr *tva = ap->a_vap; 1516 char *path = ap->a_target; 1517 kauth_cred_t cred = cnp->cn_cred; 1518 struct lwp *l = curlwp; 1519 /* locals */ 1520 int error; 1521 u_long saved_cn_flags; 1522 const char *nm = cnp->cn_nameptr; 1523 int len = cnp->cn_namelen; 1524 int plen = strlen(path); 1525 1526 /* 1527 * Here's the strategy for the moment: perform the symlink, then 1528 * do a lookup to grab the resulting vnode. I know this requires 1529 * two communications with Venus for a new sybolic link, but 1530 * that's the way the ball bounces. I don't yet want to change 1531 * the way the Mach symlink works. When Mach support is 1532 * deprecated, we should change symlink so that the common case 1533 * returns the resultant vnode in a vpp argument. 1534 */ 1535 1536 MARK_ENTRY(CODA_SYMLINK_STATS); 1537 1538 /* Check for symlink of control object. */ 1539 if (IS_CTL_NAME(dvp, nm, len)) { 1540 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1541 error = EACCES; 1542 goto exit; 1543 } 1544 1545 if (plen+1 > CODA_MAXPATHLEN) { 1546 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1547 error = EINVAL; 1548 goto exit; 1549 } 1550 1551 if (len+1 > CODA_MAXNAMLEN) { 1552 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1553 error = EINVAL; 1554 goto exit; 1555 } 1556 1557 error = venus_symlink(vtomi(dvp), &dcp->c_fid, path, plen, nm, len, tva, cred, l); 1558 1559 /* Invalidate the parent's attr cache (modification time has changed). */ 1560 dcp->c_flags &= ~C_VATTR; 1561 1562 if (!error) { 1563 /* 1564 * VOP_SYMLINK is not defined to pay attention to cnp->cn_flags; 1565 * these are defined only for VOP_LOOKUP. We desire to reuse 1566 * cnp for a VOP_LOOKUP operation, and must be sure to not pass 1567 * stray flags passed to us. Such stray flags can occur because 1568 * sys_symlink makes a namei call and then reuses the 1569 * componentname structure. 1570 */ 1571 /* 1572 * XXX Arguably we should create our own componentname structure 1573 * and not reuse the one that was passed in. 1574 */ 1575 saved_cn_flags = cnp->cn_flags; 1576 cnp->cn_flags &= ~(MODMASK | OPMASK); 1577 cnp->cn_flags |= LOOKUP; 1578 error = VOP_LOOKUP(dvp, ap->a_vpp, cnp); 1579 cnp->cn_flags = saved_cn_flags; 1580 /* Either an error occurs, or ap->a_vpp is locked. */ 1581 } 1582 1583 exit: 1584 /* unlock and deference parent */ 1585 vput(dvp); 1586 1587 CODADEBUG(CODA_SYMLINK, myprintf(("in symlink result %d\n",error)); ) 1588 return(error); 1589 } 1590 1591 /* 1592 * Read directory entries. 1593 */ 1594 int 1595 coda_readdir(void *v) 1596 { 1597 /* true args */ 1598 struct vop_readdir_args *ap = v; 1599 vnode_t *vp = ap->a_vp; 1600 struct cnode *cp = VTOC(vp); 1601 struct uio *uiop = ap->a_uio; 1602 kauth_cred_t cred = ap->a_cred; 1603 int *eofflag = ap->a_eofflag; 1604 off_t **cookies = ap->a_cookies; 1605 int *ncookies = ap->a_ncookies; 1606 /* upcall decl */ 1607 /* locals */ 1608 int error = 0; 1609 1610 MARK_ENTRY(CODA_READDIR_STATS); 1611 1612 CODADEBUG(CODA_READDIR, myprintf(("%s: (%p, %lu, %lld)\n", __func__, 1613 uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, 1614 (long long) uiop->uio_offset)); ) 1615 1616 /* Check for readdir of control object. */ 1617 if (IS_CTL_VP(vp)) { 1618 MARK_INT_FAIL(CODA_READDIR_STATS); 1619 return(ENOENT); 1620 } 1621 1622 { 1623 /* Redirect the request to UFS. */ 1624 1625 /* If directory is not already open do an "internal open" on it. */ 1626 int opened_internally = 0; 1627 if (cp->c_ovp == NULL) { 1628 opened_internally = 1; 1629 MARK_INT_GEN(CODA_OPEN_STATS); 1630 error = VOP_OPEN(vp, FREAD, cred); 1631 #ifdef CODA_VERBOSE 1632 printf("%s: Internally Opening %p\n", __func__, vp); 1633 #endif 1634 if (error) return(error); 1635 } else 1636 vp = cp->c_ovp; 1637 1638 /* Have UFS handle the call. */ 1639 CODADEBUG(CODA_READDIR, myprintf(("%s: fid = %s, refcnt = %d\n", 1640 __func__, coda_f2s(&cp->c_fid), vp->v_usecount)); ) 1641 error = VOP_READDIR(vp, uiop, cred, eofflag, cookies, ncookies); 1642 if (error) 1643 MARK_INT_FAIL(CODA_READDIR_STATS); 1644 else 1645 MARK_INT_SAT(CODA_READDIR_STATS); 1646 1647 /* Do an "internal close" if necessary. */ 1648 if (opened_internally) { 1649 MARK_INT_GEN(CODA_CLOSE_STATS); 1650 (void)VOP_CLOSE(vp, FREAD, cred); 1651 } 1652 } 1653 1654 return(error); 1655 } 1656 1657 /* 1658 * Convert from file system blocks to device blocks 1659 */ 1660 int 1661 coda_bmap(void *v) 1662 { 1663 /* XXX on the global proc */ 1664 /* true args */ 1665 struct vop_bmap_args *ap = v; 1666 vnode_t *vp __unused = ap->a_vp; /* file's vnode */ 1667 daddr_t bn __unused = ap->a_bn; /* fs block number */ 1668 vnode_t **vpp = ap->a_vpp; /* RETURN vp of device */ 1669 daddr_t *bnp __unused = ap->a_bnp; /* RETURN device block number */ 1670 struct lwp *l __unused = curlwp; 1671 /* upcall decl */ 1672 /* locals */ 1673 1674 *vpp = (vnode_t *)0; 1675 myprintf(("coda_bmap called!\n")); 1676 return(EINVAL); 1677 } 1678 1679 /* 1680 * I don't think the following two things are used anywhere, so I've 1681 * commented them out 1682 * 1683 * struct buf *async_bufhead; 1684 * int async_daemon_count; 1685 */ 1686 int 1687 coda_strategy(void *v) 1688 { 1689 /* true args */ 1690 struct vop_strategy_args *ap = v; 1691 struct buf *bp __unused = ap->a_bp; 1692 struct lwp *l __unused = curlwp; 1693 /* upcall decl */ 1694 /* locals */ 1695 1696 myprintf(("coda_strategy called! ")); 1697 return(EINVAL); 1698 } 1699 1700 int 1701 coda_reclaim(void *v) 1702 { 1703 /* true args */ 1704 struct vop_reclaim_args *ap = v; 1705 vnode_t *vp = ap->a_vp; 1706 struct cnode *cp = VTOC(vp); 1707 /* upcall decl */ 1708 /* locals */ 1709 1710 /* 1711 * Forced unmount/flush will let vnodes with non zero use be destroyed! 1712 */ 1713 ENTRY; 1714 1715 if (IS_UNMOUNTING(cp)) { 1716 #ifdef DEBUG 1717 if (VTOC(vp)->c_ovp) { 1718 if (IS_UNMOUNTING(cp)) 1719 printf("%s: c_ovp not void: vp %p, cp %p\n", __func__, vp, cp); 1720 } 1721 #endif 1722 } else { 1723 #ifdef OLD_DIAGNOSTIC 1724 if (vp->v_usecount != 0) 1725 print("%s: pushing active %p\n", __func__, vp); 1726 if (VTOC(vp)->c_ovp) { 1727 panic("%s: c_ovp not void", __func__); 1728 } 1729 #endif 1730 } 1731 coda_free(VTOC(vp)); 1732 SET_VTOC(vp) = NULL; 1733 return (0); 1734 } 1735 1736 int 1737 coda_lock(void *v) 1738 { 1739 /* true args */ 1740 struct vop_lock_args *ap = v; 1741 vnode_t *vp = ap->a_vp; 1742 struct cnode *cp = VTOC(vp); 1743 /* upcall decl */ 1744 /* locals */ 1745 1746 ENTRY; 1747 1748 if (coda_lockdebug) { 1749 myprintf(("Attempting lock on %s\n", 1750 coda_f2s(&cp->c_fid))); 1751 } 1752 1753 return genfs_lock(v); 1754 } 1755 1756 int 1757 coda_unlock(void *v) 1758 { 1759 /* true args */ 1760 struct vop_unlock_args *ap = v; 1761 vnode_t *vp = ap->a_vp; 1762 struct cnode *cp = VTOC(vp); 1763 /* upcall decl */ 1764 /* locals */ 1765 1766 ENTRY; 1767 if (coda_lockdebug) { 1768 myprintf(("Attempting unlock on %s\n", 1769 coda_f2s(&cp->c_fid))); 1770 } 1771 1772 return genfs_unlock(v); 1773 } 1774 1775 int 1776 coda_islocked(void *v) 1777 { 1778 /* true args */ 1779 ENTRY; 1780 1781 return genfs_islocked(v); 1782 } 1783 1784 /* 1785 * Given a device and inode, obtain a locked vnode. One reference is 1786 * obtained and passed back to the caller. 1787 */ 1788 int 1789 coda_grab_vnode(vnode_t *uvp, dev_t dev, ino_t ino, vnode_t **vpp) 1790 { 1791 int error; 1792 struct mount *mp; 1793 1794 /* Obtain mount point structure from device. */ 1795 if (!(mp = devtomp(dev))) { 1796 myprintf(("%s: devtomp(0x%llx) returns NULL\n", __func__, 1797 (unsigned long long)dev)); 1798 return(ENXIO); 1799 } 1800 1801 /* 1802 * Obtain vnode from mount point and inode. 1803 * XXX VFS_VGET does not clearly define locked/referenced state of 1804 * returned vnode. 1805 */ 1806 error = VFS_VGET(mp, ino, vpp); 1807 if (error) { 1808 myprintf(("%s: iget/vget(0x%llx, %llu) returns %p, err %d\n", __func__, 1809 (unsigned long long)dev, (unsigned long long)ino, *vpp, error)); 1810 return(ENOENT); 1811 } 1812 /* share the underlying vnode lock with the coda vnode */ 1813 mutex_obj_hold((*vpp)->v_interlock); 1814 uvm_obj_setlock(&uvp->v_uobj, (*vpp)->v_interlock); 1815 if (!VOP_ISLOCKED(*vpp)) 1816 VOP_LOCK(*vpp, LK_EXCLUSIVE); 1817 return(0); 1818 } 1819 1820 static void 1821 coda_print_vattr(struct vattr *attr) 1822 { 1823 const char *typestr; 1824 1825 switch (attr->va_type) { 1826 case VNON: 1827 typestr = "VNON"; 1828 break; 1829 case VREG: 1830 typestr = "VREG"; 1831 break; 1832 case VDIR: 1833 typestr = "VDIR"; 1834 break; 1835 case VBLK: 1836 typestr = "VBLK"; 1837 break; 1838 case VCHR: 1839 typestr = "VCHR"; 1840 break; 1841 case VLNK: 1842 typestr = "VLNK"; 1843 break; 1844 case VSOCK: 1845 typestr = "VSCK"; 1846 break; 1847 case VFIFO: 1848 typestr = "VFFO"; 1849 break; 1850 case VBAD: 1851 typestr = "VBAD"; 1852 break; 1853 default: 1854 typestr = "????"; 1855 break; 1856 } 1857 1858 1859 myprintf(("attr: type %s mode %d uid %d gid %d fsid %d rdev %d\n", 1860 typestr, (int)attr->va_mode, (int)attr->va_uid, 1861 (int)attr->va_gid, (int)attr->va_fsid, (int)attr->va_rdev)); 1862 1863 myprintf((" fileid %d nlink %d size %d blocksize %d bytes %d\n", 1864 (int)attr->va_fileid, (int)attr->va_nlink, 1865 (int)attr->va_size, 1866 (int)attr->va_blocksize,(int)attr->va_bytes)); 1867 myprintf((" gen %ld flags %ld vaflags %d\n", 1868 attr->va_gen, attr->va_flags, attr->va_vaflags)); 1869 myprintf((" atime sec %d nsec %d\n", 1870 (int)attr->va_atime.tv_sec, (int)attr->va_atime.tv_nsec)); 1871 myprintf((" mtime sec %d nsec %d\n", 1872 (int)attr->va_mtime.tv_sec, (int)attr->va_mtime.tv_nsec)); 1873 myprintf((" ctime sec %d nsec %d\n", 1874 (int)attr->va_ctime.tv_sec, (int)attr->va_ctime.tv_nsec)); 1875 } 1876 1877 /* 1878 * Return a vnode for the given fid. 1879 * If no cnode exists for this fid create one and put it 1880 * in a table hashed by coda_f2i(). If the cnode for 1881 * this fid is already in the table return it (ref count is 1882 * incremented by coda_find. The cnode will be flushed from the 1883 * table when coda_inactive calls coda_unsave. 1884 */ 1885 struct cnode * 1886 make_coda_node(CodaFid *fid, struct mount *fvsp, short type) 1887 { 1888 struct cnode *cp; 1889 int error; 1890 1891 if ((cp = coda_find(fid)) == NULL) { 1892 vnode_t *vp; 1893 1894 cp = coda_alloc(); 1895 cp->c_fid = *fid; 1896 1897 error = getnewvnode(VT_CODA, fvsp, coda_vnodeop_p, NULL, &vp); 1898 if (error) { 1899 panic("%s: getnewvnode returned error %d", __func__, error); 1900 } 1901 vp->v_data = cp; 1902 vp->v_type = type; 1903 cp->c_vnode = vp; 1904 uvm_vnp_setsize(vp, 0); 1905 coda_save(cp); 1906 1907 } else { 1908 vref(CTOV(cp)); 1909 } 1910 1911 return cp; 1912 } 1913 1914 /* 1915 * coda_getpages may be called on a vnode which has not been opened, 1916 * e.g. to fault in pages to execute a program. In that case, we must 1917 * open the file to get the container. The vnode may or may not be 1918 * locked, and we must leave it in the same state. 1919 */ 1920 int 1921 coda_getpages(void *v) 1922 { 1923 struct vop_getpages_args /* { 1924 vnode_t *a_vp; 1925 voff_t a_offset; 1926 struct vm_page **a_m; 1927 int *a_count; 1928 int a_centeridx; 1929 vm_prot_t a_access_type; 1930 int a_advice; 1931 int a_flags; 1932 } */ *ap = v; 1933 vnode_t *vp = ap->a_vp, *cvp; 1934 struct cnode *cp = VTOC(vp); 1935 struct lwp *l = curlwp; 1936 kauth_cred_t cred = l->l_cred; 1937 int error, cerror; 1938 int waslocked; /* 1 if vnode lock was held on entry */ 1939 int didopen = 0; /* 1 if we opened container file */ 1940 1941 /* 1942 * Handle a case that uvm_fault doesn't quite use yet. 1943 * See layer_vnops.c. for inspiration. 1944 */ 1945 if (ap->a_flags & PGO_LOCKED) { 1946 return EBUSY; 1947 } 1948 1949 KASSERT(mutex_owned(vp->v_interlock)); 1950 1951 /* Check for control object. */ 1952 if (IS_CTL_VP(vp)) { 1953 #ifdef CODA_VERBOSE 1954 printf("%s: control object %p\n", __func__, vp); 1955 #endif 1956 return(EINVAL); 1957 } 1958 1959 /* 1960 * XXX It's really not ok to be releasing the lock we get, 1961 * because we could be overlapping with another call to 1962 * getpages and drop a lock they are relying on. We need to 1963 * figure out whether getpages ever is called holding the 1964 * lock, and if we should serialize getpages calls by some 1965 * mechanism. 1966 */ 1967 /* XXX VOP_ISLOCKED() may not be used for lock decisions. */ 1968 waslocked = VOP_ISLOCKED(vp); 1969 1970 /* Get container file if not already present. */ 1971 cvp = cp->c_ovp; 1972 if (cvp == NULL) { 1973 /* 1974 * VOP_OPEN requires a locked vnode. We must avoid 1975 * locking the vnode if it is already locked, and 1976 * leave it in the same state on exit. 1977 */ 1978 if (waslocked == 0) { 1979 mutex_exit(vp->v_interlock); 1980 cerror = vn_lock(vp, LK_EXCLUSIVE); 1981 if (cerror) { 1982 #ifdef CODA_VERBOSE 1983 printf("%s: can't lock vnode %p\n", 1984 __func__, vp); 1985 #endif 1986 return cerror; 1987 } 1988 #ifdef CODA_VERBOSE 1989 printf("%s: locked vnode %p\n", __func__, vp); 1990 #endif 1991 } 1992 1993 /* 1994 * Open file (causes upcall to venus). 1995 * XXX Perhaps we should not fully open the file, but 1996 * simply obtain a container file. 1997 */ 1998 /* XXX Is it ok to do this while holding the simplelock? */ 1999 cerror = VOP_OPEN(vp, FREAD, cred); 2000 2001 if (cerror) { 2002 #ifdef CODA_VERBOSE 2003 printf("%s: cannot open vnode %p => %d\n", __func__, 2004 vp, cerror); 2005 #endif 2006 if (waslocked == 0) 2007 VOP_UNLOCK(vp); 2008 return cerror; 2009 } 2010 2011 #ifdef CODA_VERBOSE 2012 printf("%s: opened vnode %p\n", __func__, vp); 2013 #endif 2014 cvp = cp->c_ovp; 2015 didopen = 1; 2016 if (waslocked == 0) 2017 mutex_enter(vp->v_interlock); 2018 } 2019 KASSERT(cvp != NULL); 2020 2021 /* Munge the arg structure to refer to the container vnode. */ 2022 KASSERT(cvp->v_interlock == vp->v_interlock); 2023 ap->a_vp = cp->c_ovp; 2024 2025 /* Finally, call getpages on it. */ 2026 error = VCALL(ap->a_vp, VOFFSET(vop_getpages), ap); 2027 2028 /* If we opened the vnode, we must close it. */ 2029 if (didopen) { 2030 /* 2031 * VOP_CLOSE requires a locked vnode, but we are still 2032 * holding the lock (or riding a caller's lock). 2033 */ 2034 cerror = VOP_CLOSE(vp, FREAD, cred); 2035 #ifdef CODA_VERBOSE 2036 if (cerror != 0) 2037 /* XXX How should we handle this? */ 2038 printf("%s: closed vnode %p -> %d\n", __func__, 2039 vp, cerror); 2040 #endif 2041 2042 /* If we obtained a lock, drop it. */ 2043 if (waslocked == 0) 2044 VOP_UNLOCK(vp); 2045 } 2046 2047 return error; 2048 } 2049 2050 /* 2051 * The protocol requires v_interlock to be held by the caller. 2052 */ 2053 int 2054 coda_putpages(void *v) 2055 { 2056 struct vop_putpages_args /* { 2057 vnode_t *a_vp; 2058 voff_t a_offlo; 2059 voff_t a_offhi; 2060 int a_flags; 2061 } */ *ap = v; 2062 vnode_t *vp = ap->a_vp, *cvp; 2063 struct cnode *cp = VTOC(vp); 2064 int error; 2065 2066 KASSERT(mutex_owned(vp->v_interlock)); 2067 2068 /* Check for control object. */ 2069 if (IS_CTL_VP(vp)) { 2070 mutex_exit(vp->v_interlock); 2071 #ifdef CODA_VERBOSE 2072 printf("%s: control object %p\n", __func__, vp); 2073 #endif 2074 return(EINVAL); 2075 } 2076 2077 /* 2078 * If container object is not present, then there are no pages 2079 * to put; just return without error. This happens all the 2080 * time, apparently during discard of a closed vnode (which 2081 * trivially can't have dirty pages). 2082 */ 2083 cvp = cp->c_ovp; 2084 if (cvp == NULL) { 2085 mutex_exit(vp->v_interlock); 2086 return 0; 2087 } 2088 2089 /* Munge the arg structure to refer to the container vnode. */ 2090 KASSERT(cvp->v_interlock == vp->v_interlock); 2091 ap->a_vp = cvp; 2092 2093 /* Finally, call putpages on it. */ 2094 error = VCALL(ap->a_vp, VOFFSET(vop_putpages), ap); 2095 2096 return error; 2097 } 2098
Indexes created Mon Oct 20 11:09:49 GMT 2025