coda_vnops.c revision 1.85
1 /* $NetBSD: coda_vnops.c,v 1.85 2012/05/02 16:51:01 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 1.85 2012/05/02 16:51:01 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 const struct vnodeopv_desc coda_vnodeop_opv_desc = 144 { &coda_vnodeop_p, coda_vnodeop_entries }; 145 146 /* Definitions of NetBSD vnodeop interfaces */ 147 148 /* 149 * A generic error routine. Return EIO without looking at arguments. 150 */ 151 int 152 coda_vop_error(void *anon) { 153 struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; 154 155 if (codadebug) { 156 myprintf(("%s: Vnode operation %s called (error).\n", 157 __func__, (*desc)->vdesc_name)); 158 } 159 160 return EIO; 161 } 162 163 /* A generic do-nothing. */ 164 int 165 coda_vop_nop(void *anon) { 166 struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; 167 168 if (codadebug) { 169 myprintf(("Vnode operation %s called, but unsupported\n", 170 (*desc)->vdesc_name)); 171 } 172 return (0); 173 } 174 175 int 176 coda_vnodeopstats_init(void) 177 { 178 int i; 179 180 for(i=0;i<CODA_VNODEOPS_SIZE;i++) { 181 coda_vnodeopstats[i].opcode = i; 182 coda_vnodeopstats[i].entries = 0; 183 coda_vnodeopstats[i].sat_intrn = 0; 184 coda_vnodeopstats[i].unsat_intrn = 0; 185 coda_vnodeopstats[i].gen_intrn = 0; 186 } 187 188 return 0; 189 } 190 191 /* 192 * XXX The entire relationship between VOP_OPEN and having a container 193 * file (via venus_open) needs to be reexamined. In particular, it's 194 * valid to open/mmap/close and then reference. Instead of doing 195 * VOP_OPEN when getpages needs a container, we should do the 196 * venus_open part, and record that the vnode has opened the container 197 * for getpages, and do the matching logical close on coda_inactive. 198 * Further, coda_rdwr needs a container file, and sometimes needs to 199 * do the equivalent of open (core dumps). 200 */ 201 /* 202 * coda_open calls Venus to return the device and inode of the 203 * container file, and then obtains a vnode for that file. The 204 * container vnode is stored in the coda vnode, and a reference is 205 * added for each open file. 206 */ 207 int 208 coda_open(void *v) 209 { 210 /* 211 * NetBSD can pass the O_EXCL flag in mode, even though the check 212 * has already happened. Venus defensively assumes that if open 213 * is passed the EXCL, it must be a bug. We strip the flag here. 214 */ 215 /* true args */ 216 struct vop_open_args *ap = v; 217 vnode_t *vp = ap->a_vp; 218 struct cnode *cp = VTOC(vp); 219 int flag = ap->a_mode & (~O_EXCL); 220 kauth_cred_t cred = ap->a_cred; 221 /* locals */ 222 int error; 223 dev_t dev; /* container file device, inode, vnode */ 224 ino_t inode; 225 vnode_t *container_vp; 226 227 MARK_ENTRY(CODA_OPEN_STATS); 228 229 /* Check for open of control file. */ 230 if (IS_CTL_VP(vp)) { 231 /* if (WRITABLE(flag)) */ 232 if (flag & (FWRITE | O_TRUNC | O_CREAT | O_EXCL)) { 233 MARK_INT_FAIL(CODA_OPEN_STATS); 234 return(EACCES); 235 } 236 MARK_INT_SAT(CODA_OPEN_STATS); 237 return(0); 238 } 239 240 error = venus_open(vtomi(vp), &cp->c_fid, flag, cred, curlwp, &dev, &inode); 241 if (error) 242 return (error); 243 if (!error) { 244 CODADEBUG(CODA_OPEN, myprintf(( 245 "%s: dev 0x%llx inode %llu result %d\n", __func__, 246 (unsigned long long)dev, (unsigned long long)inode, error));) 247 } 248 249 /* 250 * Obtain locked and referenced container vnode from container 251 * device/inode. 252 */ 253 error = coda_grab_vnode(vp, dev, inode, &container_vp); 254 if (error) 255 return (error); 256 257 /* Save the vnode pointer for the container file. */ 258 if (cp->c_ovp == NULL) { 259 cp->c_ovp = container_vp; 260 } else { 261 if (cp->c_ovp != container_vp) 262 /* 263 * Perhaps venus returned a different container, or 264 * something else went wrong. 265 */ 266 panic("%s: cp->c_ovp != container_vp", __func__); 267 } 268 cp->c_ocount++; 269 270 /* Flush the attribute cache if writing the file. */ 271 if (flag & FWRITE) { 272 cp->c_owrite++; 273 cp->c_flags &= ~C_VATTR; 274 } 275 276 /* 277 * Save the <device, inode> pair for the container file to speed 278 * up subsequent reads while closed (mmap, program execution). 279 * This is perhaps safe because venus will invalidate the node 280 * before changing the container file mapping. 281 */ 282 cp->c_device = dev; 283 cp->c_inode = inode; 284 285 /* Open the container file. */ 286 error = VOP_OPEN(container_vp, flag, cred); 287 /* 288 * Drop the lock on the container, after we have done VOP_OPEN 289 * (which requires a locked vnode). 290 */ 291 VOP_UNLOCK(container_vp); 292 return(error); 293 } 294 295 /* 296 * Close the cache file used for I/O and notify Venus. 297 */ 298 int 299 coda_close(void *v) 300 { 301 /* true args */ 302 struct vop_close_args *ap = v; 303 vnode_t *vp = ap->a_vp; 304 struct cnode *cp = VTOC(vp); 305 int flag = ap->a_fflag; 306 kauth_cred_t cred = ap->a_cred; 307 /* locals */ 308 int error; 309 310 MARK_ENTRY(CODA_CLOSE_STATS); 311 312 /* Check for close of control file. */ 313 if (IS_CTL_VP(vp)) { 314 MARK_INT_SAT(CODA_CLOSE_STATS); 315 return(0); 316 } 317 318 /* 319 * XXX The IS_UNMOUNTING part of this is very suspect. 320 */ 321 if (IS_UNMOUNTING(cp)) { 322 if (cp->c_ovp) { 323 #ifdef CODA_VERBOSE 324 printf("%s: destroying container %d, ufs vp %p of vp %p/cp %p\n", 325 __func__, vp->v_usecount, cp->c_ovp, vp, cp); 326 #endif 327 #ifdef hmm 328 vgone(cp->c_ovp); 329 #else 330 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 331 VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ 332 vput(cp->c_ovp); 333 #endif 334 } else { 335 #ifdef CODA_VERBOSE 336 printf("%s: NO container vp %p/cp %p\n", __func__, vp, cp); 337 #endif 338 } 339 return ENODEV; 340 } 341 342 /* Lock the container node, and VOP_CLOSE it. */ 343 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 344 VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ 345 /* 346 * Drop the lock we just obtained, and vrele the container vnode. 347 * Decrement reference counts, and clear container vnode pointer on 348 * last close. 349 */ 350 vput(cp->c_ovp); 351 if (flag & FWRITE) 352 --cp->c_owrite; 353 if (--cp->c_ocount == 0) 354 cp->c_ovp = NULL; 355 356 error = venus_close(vtomi(vp), &cp->c_fid, flag, cred, curlwp); 357 358 CODADEBUG(CODA_CLOSE, myprintf(("%s: result %d\n", __func__, error)); ) 359 return(error); 360 } 361 362 int 363 coda_read(void *v) 364 { 365 struct vop_read_args *ap = v; 366 367 ENTRY; 368 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_READ, 369 ap->a_ioflag, ap->a_cred, curlwp)); 370 } 371 372 int 373 coda_write(void *v) 374 { 375 struct vop_write_args *ap = v; 376 377 ENTRY; 378 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_WRITE, 379 ap->a_ioflag, ap->a_cred, curlwp)); 380 } 381 382 int 383 coda_rdwr(vnode_t *vp, struct uio *uiop, enum uio_rw rw, int ioflag, 384 kauth_cred_t cred, struct lwp *l) 385 { 386 /* upcall decl */ 387 /* NOTE: container file operation!!! */ 388 /* locals */ 389 struct cnode *cp = VTOC(vp); 390 vnode_t *cfvp = cp->c_ovp; 391 struct proc *p = l->l_proc; 392 int opened_internally = 0; 393 int error = 0; 394 395 MARK_ENTRY(CODA_RDWR_STATS); 396 397 CODADEBUG(CODA_RDWR, myprintf(("coda_rdwr(%d, %p, %lu, %lld)\n", rw, 398 uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, 399 (long long) uiop->uio_offset)); ) 400 401 /* Check for rdwr of control object. */ 402 if (IS_CTL_VP(vp)) { 403 MARK_INT_FAIL(CODA_RDWR_STATS); 404 return(EINVAL); 405 } 406 407 /* Redirect the request to UFS. */ 408 409 /* 410 * If file is not already open this must be a page 411 * {read,write} request. Iget the cache file's inode 412 * pointer if we still have its <device, inode> pair. 413 * Otherwise, we must do an internal open to derive the 414 * pair. 415 * XXX Integrate this into a coherent strategy for container 416 * file acquisition. 417 */ 418 if (cfvp == NULL) { 419 /* 420 * If we're dumping core, do the internal open. Otherwise 421 * venus won't have the correct size of the core when 422 * it's completely written. 423 */ 424 if (cp->c_inode != 0 && !(p && (p->p_acflag & ACORE))) { 425 printf("%s: grabbing container vnode, losing reference\n", 426 __func__); 427 /* Get locked and refed vnode. */ 428 error = coda_grab_vnode(vp, cp->c_device, cp->c_inode, &cfvp); 429 if (error) { 430 MARK_INT_FAIL(CODA_RDWR_STATS); 431 return(error); 432 } 433 /* 434 * Drop lock. 435 * XXX Where is reference released. 436 */ 437 VOP_UNLOCK(cfvp); 438 } 439 else { 440 printf("%s: internal VOP_OPEN\n", __func__); 441 opened_internally = 1; 442 MARK_INT_GEN(CODA_OPEN_STATS); 443 error = VOP_OPEN(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); 444 #ifdef CODA_VERBOSE 445 printf("%s: Internally Opening %p\n", __func__, vp); 446 #endif 447 if (error) { 448 MARK_INT_FAIL(CODA_RDWR_STATS); 449 return(error); 450 } 451 cfvp = cp->c_ovp; 452 } 453 } 454 455 /* Have UFS handle the call. */ 456 CODADEBUG(CODA_RDWR, myprintf(("%s: fid = %s, refcnt = %d\n", __func__, 457 coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount)); ) 458 459 if (rw == UIO_READ) { 460 error = VOP_READ(cfvp, uiop, ioflag, cred); 461 } else { 462 error = VOP_WRITE(cfvp, uiop, ioflag, cred); 463 } 464 465 if (error) 466 MARK_INT_FAIL(CODA_RDWR_STATS); 467 else 468 MARK_INT_SAT(CODA_RDWR_STATS); 469 470 /* Do an internal close if necessary. */ 471 if (opened_internally) { 472 MARK_INT_GEN(CODA_CLOSE_STATS); 473 (void)VOP_CLOSE(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); 474 } 475 476 /* Invalidate cached attributes if writing. */ 477 if (rw == UIO_WRITE) 478 cp->c_flags &= ~C_VATTR; 479 return(error); 480 } 481 482 int 483 coda_ioctl(void *v) 484 { 485 /* true args */ 486 struct vop_ioctl_args *ap = v; 487 vnode_t *vp = ap->a_vp; 488 int com = ap->a_command; 489 void *data = ap->a_data; 490 int flag = ap->a_fflag; 491 kauth_cred_t cred = ap->a_cred; 492 /* locals */ 493 int error; 494 vnode_t *tvp; 495 struct PioctlData *iap = (struct PioctlData *)data; 496 namei_simple_flags_t sflags; 497 498 MARK_ENTRY(CODA_IOCTL_STATS); 499 500 CODADEBUG(CODA_IOCTL, myprintf(("in coda_ioctl on %s\n", iap->path));) 501 502 /* Don't check for operation on a dying object, for ctlvp it 503 shouldn't matter */ 504 505 /* Must be control object to succeed. */ 506 if (!IS_CTL_VP(vp)) { 507 MARK_INT_FAIL(CODA_IOCTL_STATS); 508 CODADEBUG(CODA_IOCTL, myprintf(("%s error: vp != ctlvp", __func__));) 509 return (EOPNOTSUPP); 510 } 511 /* Look up the pathname. */ 512 513 /* Should we use the name cache here? It would get it from 514 lookupname sooner or later anyway, right? */ 515 516 sflags = iap->follow ? NSM_FOLLOW_NOEMULROOT : NSM_NOFOLLOW_NOEMULROOT; 517 error = namei_simple_user(iap->path, sflags, &tvp); 518 519 if (error) { 520 MARK_INT_FAIL(CODA_IOCTL_STATS); 521 CODADEBUG(CODA_IOCTL, myprintf(("%s error: lookup returns %d\n", 522 __func__, error));) 523 return(error); 524 } 525 526 /* 527 * Make sure this is a coda style cnode, but it may be a 528 * different vfsp 529 */ 530 /* XXX: this totally violates the comment about vtagtype in vnode.h */ 531 if (tvp->v_tag != VT_CODA) { 532 vrele(tvp); 533 MARK_INT_FAIL(CODA_IOCTL_STATS); 534 CODADEBUG(CODA_IOCTL, myprintf(("%s error: %s not a coda object\n", 535 __func__, iap->path));) 536 return(EINVAL); 537 } 538 539 if (iap->vi.in_size > VC_MAXDATASIZE || iap->vi.out_size > VC_MAXDATASIZE) { 540 vrele(tvp); 541 return(EINVAL); 542 } 543 error = venus_ioctl(vtomi(tvp), &((VTOC(tvp))->c_fid), com, flag, data, 544 cred, curlwp); 545 546 if (error) 547 MARK_INT_FAIL(CODA_IOCTL_STATS); 548 else 549 CODADEBUG(CODA_IOCTL, myprintf(("Ioctl returns %d \n", error)); ) 550 551 vrele(tvp); 552 return(error); 553 } 554 555 /* 556 * To reduce the cost of a user-level venus;we cache attributes in 557 * the kernel. Each cnode has storage allocated for an attribute. If 558 * c_vattr is valid, return a reference to it. Otherwise, get the 559 * attributes from venus and store them in the cnode. There is some 560 * question if this method is a security leak. But I think that in 561 * order to make this call, the user must have done a lookup and 562 * opened the file, and therefore should already have access. 563 */ 564 int 565 coda_getattr(void *v) 566 { 567 /* true args */ 568 struct vop_getattr_args *ap = v; 569 vnode_t *vp = ap->a_vp; 570 struct cnode *cp = VTOC(vp); 571 struct vattr *vap = ap->a_vap; 572 kauth_cred_t cred = ap->a_cred; 573 /* locals */ 574 int error; 575 576 MARK_ENTRY(CODA_GETATTR_STATS); 577 578 /* Check for getattr of control object. */ 579 if (IS_CTL_VP(vp)) { 580 MARK_INT_FAIL(CODA_GETATTR_STATS); 581 return(ENOENT); 582 } 583 584 /* Check to see if the attributes have already been cached */ 585 if (VALID_VATTR(cp)) { 586 CODADEBUG(CODA_GETATTR, { myprintf(("%s: attr cache hit: %s\n", 587 __func__, coda_f2s(&cp->c_fid)));}) 588 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 589 print_vattr(&cp->c_vattr); ) 590 591 *vap = cp->c_vattr; 592 MARK_INT_SAT(CODA_GETATTR_STATS); 593 return(0); 594 } 595 596 error = venus_getattr(vtomi(vp), &cp->c_fid, cred, curlwp, vap); 597 598 if (!error) { 599 CODADEBUG(CODA_GETATTR, myprintf(("%s miss %s: result %d\n", 600 __func__, coda_f2s(&cp->c_fid), error)); ) 601 602 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 603 print_vattr(vap); ) 604 605 /* If not open for write, store attributes in cnode */ 606 if ((cp->c_owrite == 0) && (coda_attr_cache)) { 607 cp->c_vattr = *vap; 608 cp->c_flags |= C_VATTR; 609 } 610 611 } 612 return(error); 613 } 614 615 int 616 coda_setattr(void *v) 617 { 618 /* true args */ 619 struct vop_setattr_args *ap = v; 620 vnode_t *vp = ap->a_vp; 621 struct cnode *cp = VTOC(vp); 622 struct vattr *vap = ap->a_vap; 623 kauth_cred_t cred = ap->a_cred; 624 /* locals */ 625 int error; 626 627 MARK_ENTRY(CODA_SETATTR_STATS); 628 629 /* Check for setattr of control object. */ 630 if (IS_CTL_VP(vp)) { 631 MARK_INT_FAIL(CODA_SETATTR_STATS); 632 return(ENOENT); 633 } 634 635 if (codadebug & CODADBGMSK(CODA_SETATTR)) { 636 print_vattr(vap); 637 } 638 error = venus_setattr(vtomi(vp), &cp->c_fid, vap, cred, curlwp); 639 640 if (!error) 641 cp->c_flags &= ~C_VATTR; 642 643 CODADEBUG(CODA_SETATTR, myprintf(("setattr %d\n", error)); ) 644 return(error); 645 } 646 647 int 648 coda_access(void *v) 649 { 650 /* true args */ 651 struct vop_access_args *ap = v; 652 vnode_t *vp = ap->a_vp; 653 struct cnode *cp = VTOC(vp); 654 int mode = ap->a_mode; 655 kauth_cred_t cred = ap->a_cred; 656 /* locals */ 657 int error; 658 659 MARK_ENTRY(CODA_ACCESS_STATS); 660 661 /* Check for access of control object. Only read access is 662 allowed on it. */ 663 if (IS_CTL_VP(vp)) { 664 /* bogus hack - all will be marked as successes */ 665 MARK_INT_SAT(CODA_ACCESS_STATS); 666 return(((mode & VREAD) && !(mode & (VWRITE | VEXEC))) 667 ? 0 : EACCES); 668 } 669 670 /* 671 * if the file is a directory, and we are checking exec (eg lookup) 672 * access, and the file is in the namecache, then the user must have 673 * lookup access to it. 674 */ 675 if (coda_access_cache) { 676 if ((vp->v_type == VDIR) && (mode & VEXEC)) { 677 if (coda_nc_lookup(cp, ".", 1, cred)) { 678 MARK_INT_SAT(CODA_ACCESS_STATS); 679 return(0); /* it was in the cache */ 680 } 681 } 682 } 683 684 error = venus_access(vtomi(vp), &cp->c_fid, mode, cred, curlwp); 685 686 return(error); 687 } 688 689 /* 690 * CODA abort op, called after namei() when a CREATE/DELETE isn't actually 691 * done. If a buffer has been saved in anticipation of a coda_create or 692 * a coda_remove, delete it. 693 */ 694 /* ARGSUSED */ 695 int 696 coda_abortop(void *v) 697 { 698 /* true args */ 699 struct vop_abortop_args /* { 700 vnode_t *a_dvp; 701 struct componentname *a_cnp; 702 } */ *ap = v; 703 704 (void)ap; 705 /* upcall decl */ 706 /* locals */ 707 708 return (0); 709 } 710 711 int 712 coda_readlink(void *v) 713 { 714 /* true args */ 715 struct vop_readlink_args *ap = v; 716 vnode_t *vp = ap->a_vp; 717 struct cnode *cp = VTOC(vp); 718 struct uio *uiop = ap->a_uio; 719 kauth_cred_t cred = ap->a_cred; 720 /* locals */ 721 struct lwp *l = curlwp; 722 int error; 723 char *str; 724 int len; 725 726 MARK_ENTRY(CODA_READLINK_STATS); 727 728 /* Check for readlink of control object. */ 729 if (IS_CTL_VP(vp)) { 730 MARK_INT_FAIL(CODA_READLINK_STATS); 731 return(ENOENT); 732 } 733 734 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { /* symlink was cached */ 735 uiop->uio_rw = UIO_READ; 736 error = uiomove(cp->c_symlink, (int)cp->c_symlen, uiop); 737 if (error) 738 MARK_INT_FAIL(CODA_READLINK_STATS); 739 else 740 MARK_INT_SAT(CODA_READLINK_STATS); 741 return(error); 742 } 743 744 error = venus_readlink(vtomi(vp), &cp->c_fid, cred, l, &str, &len); 745 746 if (!error) { 747 uiop->uio_rw = UIO_READ; 748 error = uiomove(str, len, uiop); 749 750 if (coda_symlink_cache) { 751 cp->c_symlink = str; 752 cp->c_symlen = len; 753 cp->c_flags |= C_SYMLINK; 754 } else 755 CODA_FREE(str, len); 756 } 757 758 CODADEBUG(CODA_READLINK, myprintf(("in readlink result %d\n",error));) 759 return(error); 760 } 761 762 int 763 coda_fsync(void *v) 764 { 765 /* true args */ 766 struct vop_fsync_args *ap = v; 767 vnode_t *vp = ap->a_vp; 768 struct cnode *cp = VTOC(vp); 769 kauth_cred_t cred = ap->a_cred; 770 /* locals */ 771 vnode_t *convp = cp->c_ovp; 772 int error; 773 774 MARK_ENTRY(CODA_FSYNC_STATS); 775 776 /* Check for fsync on an unmounting object */ 777 /* The NetBSD kernel, in it's infinite wisdom, can try to fsync 778 * after an unmount has been initiated. This is a Bad Thing, 779 * which we have to avoid. Not a legitimate failure for stats. 780 */ 781 if (IS_UNMOUNTING(cp)) { 782 return(ENODEV); 783 } 784 785 /* Check for fsync of control object. */ 786 if (IS_CTL_VP(vp)) { 787 MARK_INT_SAT(CODA_FSYNC_STATS); 788 return(0); 789 } 790 791 if (convp) 792 VOP_FSYNC(convp, cred, MNT_WAIT, 0, 0); 793 794 /* 795 * We can expect fsync on any vnode at all if venus is pruging it. 796 * Venus can't very well answer the fsync request, now can it? 797 * Hopefully, it won't have to, because hopefully, venus preserves 798 * the (possibly untrue) invariant that it never purges an open 799 * vnode. Hopefully. 800 */ 801 if (cp->c_flags & C_PURGING) { 802 return(0); 803 } 804 805 error = venus_fsync(vtomi(vp), &cp->c_fid, cred, curlwp); 806 807 CODADEBUG(CODA_FSYNC, myprintf(("in fsync result %d\n",error)); ) 808 return(error); 809 } 810 811 /* 812 * vp is locked on entry, and we must unlock it. 813 * XXX This routine is suspect and probably needs rewriting. 814 */ 815 int 816 coda_inactive(void *v) 817 { 818 /* true args */ 819 struct vop_inactive_args *ap = v; 820 vnode_t *vp = ap->a_vp; 821 struct cnode *cp = VTOC(vp); 822 kauth_cred_t cred __unused = NULL; 823 824 /* We don't need to send inactive to venus - DCS */ 825 MARK_ENTRY(CODA_INACTIVE_STATS); 826 827 if (IS_CTL_VP(vp)) { 828 MARK_INT_SAT(CODA_INACTIVE_STATS); 829 return 0; 830 } 831 832 CODADEBUG(CODA_INACTIVE, myprintf(("in inactive, %s, vfsp %p\n", 833 coda_f2s(&cp->c_fid), vp->v_mount));) 834 835 /* If an array has been allocated to hold the symlink, deallocate it */ 836 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { 837 if (cp->c_symlink == NULL) 838 panic("%s: null symlink pointer in cnode", __func__); 839 840 CODA_FREE(cp->c_symlink, cp->c_symlen); 841 cp->c_flags &= ~C_SYMLINK; 842 cp->c_symlen = 0; 843 } 844 845 /* Remove it from the table so it can't be found. */ 846 coda_unsave(cp); 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 if (IS_UNMOUNTING(cp)) { 853 /* XXX Do we need to VOP_CLOSE container vnodes? */ 854 if (vp->v_usecount > 1) 855 printf("%s: IS_UNMOUNTING %p usecount %d\n", 856 __func__, vp, vp->v_usecount); 857 if (cp->c_ovp != NULL) 858 printf("%s: %p ovp != NULL\n", __func__, vp); 859 VOP_UNLOCK(vp); 860 } else { 861 /* Sanity checks that perhaps should be panic. */ 862 if (vp->v_usecount > 1) { 863 printf("%s: %p usecount %d\n", __func__, vp, vp->v_usecount); 864 } 865 if (cp->c_ovp != NULL) { 866 printf("%s: %p ovp != NULL\n", __func__, vp); 867 } 868 VOP_UNLOCK(vp); 869 *ap->a_recycle = true; 870 } 871 872 MARK_INT_SAT(CODA_INACTIVE_STATS); 873 return(0); 874 } 875 876 /* 877 * Coda does not use the normal namecache, but a private version. 878 * Consider how to use the standard facility instead. 879 */ 880 int 881 coda_lookup(void *v) 882 { 883 /* true args */ 884 struct vop_lookup_args *ap = v; 885 /* (locked) vnode of dir in which to do lookup */ 886 vnode_t *dvp = ap->a_dvp; 887 struct cnode *dcp = VTOC(dvp); 888 /* output variable for result */ 889 vnode_t **vpp = ap->a_vpp; 890 /* name to lookup */ 891 struct componentname *cnp = ap->a_cnp; 892 kauth_cred_t cred = cnp->cn_cred; 893 struct lwp *l = curlwp; 894 /* locals */ 895 struct cnode *cp; 896 const char *nm = cnp->cn_nameptr; 897 int len = cnp->cn_namelen; 898 int flags = cnp->cn_flags; 899 int isdot; 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 * XXX Check for DOT lookups, and short circuit all the caches, 940 * just doing an extra vref. (venus guarantees that lookup of 941 * . returns self.) 942 */ 943 isdot = (len == 1 && nm[0] == '.'); 944 945 /* 946 * Try to resolve the lookup in the minicache. If that fails, ask 947 * venus to do the lookup. XXX The interaction between vnode 948 * locking and any locking that coda does is not clear. 949 */ 950 cp = coda_nc_lookup(dcp, nm, len, cred); 951 if (cp) { 952 *vpp = CTOV(cp); 953 vref(*vpp); 954 CODADEBUG(CODA_LOOKUP, 955 myprintf(("lookup result %d vpp %p\n",error,*vpp));) 956 } else { 957 /* The name wasn't cached, so ask Venus. */ 958 error = venus_lookup(vtomi(dvp), &dcp->c_fid, nm, len, cred, l, &VFid, &vtype); 959 960 if (error) { 961 MARK_INT_FAIL(CODA_LOOKUP_STATS); 962 CODADEBUG(CODA_LOOKUP, myprintf(("lookup error on %s (%s)%d\n", 963 coda_f2s(&dcp->c_fid), nm, error));) 964 *vpp = (vnode_t *)0; 965 } else { 966 MARK_INT_SAT(CODA_LOOKUP_STATS); 967 CODADEBUG(CODA_LOOKUP, myprintf(("%s: %s type %o result %d\n", 968 __func__, coda_f2s(&VFid), vtype, error)); ) 969 970 cp = make_coda_node(&VFid, dvp->v_mount, vtype); 971 *vpp = CTOV(cp); 972 /* vpp is now vrefed. */ 973 974 /* 975 * Unless this vnode is marked CODA_NOCACHE, enter it into 976 * the coda name cache to avoid a future venus round-trip. 977 * XXX Interaction with componentname NOCACHE is unclear. 978 */ 979 if (!(vtype & CODA_NOCACHE)) 980 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 981 } 982 } 983 984 exit: 985 /* 986 * If we are creating, and this was the last name to be looked up, 987 * and the error was ENOENT, then make the leaf NULL and return 988 * success. 989 * XXX Check against new lookup rules. 990 */ 991 if (((cnp->cn_nameiop == CREATE) || (cnp->cn_nameiop == RENAME)) 992 && (cnp->cn_flags & ISLASTCN) 993 && (error == ENOENT)) 994 { 995 error = EJUSTRETURN; 996 *ap->a_vpp = NULL; 997 } 998 999 /* 1000 * If the lookup succeeded, we must generally lock the returned 1001 * vnode. This could be a ., .., or normal lookup. See 1002 * vnodeops(9) for the details. 1003 */ 1004 /* 1005 * XXX LK_RETRY is likely incorrect. Handle vn_lock failure 1006 * somehow, and remove LK_RETRY. 1007 */ 1008 if (!error || (error == EJUSTRETURN)) { 1009 /* Lookup has a value and it isn't "."? */ 1010 if (*ap->a_vpp && (*ap->a_vpp != dvp)) { 1011 if (flags & ISDOTDOT) 1012 /* ..: unlock parent */ 1013 VOP_UNLOCK(dvp); 1014 /* all but .: lock child */ 1015 vn_lock(*ap->a_vpp, LK_EXCLUSIVE | LK_RETRY); 1016 if (flags & ISDOTDOT) 1017 /* ..: relock parent */ 1018 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1019 } 1020 /* else .: leave dvp locked */ 1021 } else { 1022 /* The lookup failed, so return NULL. Leave dvp locked. */ 1023 *ap->a_vpp = NULL; 1024 } 1025 return(error); 1026 } 1027 1028 /*ARGSUSED*/ 1029 int 1030 coda_create(void *v) 1031 { 1032 /* true args */ 1033 struct vop_create_args *ap = v; 1034 vnode_t *dvp = ap->a_dvp; 1035 struct cnode *dcp = VTOC(dvp); 1036 struct vattr *va = ap->a_vap; 1037 int exclusive = 1; 1038 int mode = ap->a_vap->va_mode; 1039 vnode_t **vpp = ap->a_vpp; 1040 struct componentname *cnp = ap->a_cnp; 1041 kauth_cred_t cred = cnp->cn_cred; 1042 struct lwp *l = curlwp; 1043 /* locals */ 1044 int error; 1045 struct cnode *cp; 1046 const char *nm = cnp->cn_nameptr; 1047 int len = cnp->cn_namelen; 1048 CodaFid VFid; 1049 struct vattr attr; 1050 1051 MARK_ENTRY(CODA_CREATE_STATS); 1052 1053 /* All creates are exclusive XXX */ 1054 /* I'm assuming the 'mode' argument is the file mode bits XXX */ 1055 1056 /* Check for create of control object. */ 1057 if (IS_CTL_NAME(dvp, nm, len)) { 1058 *vpp = (vnode_t *)0; 1059 MARK_INT_FAIL(CODA_CREATE_STATS); 1060 return(EACCES); 1061 } 1062 1063 error = venus_create(vtomi(dvp), &dcp->c_fid, nm, len, exclusive, mode, va, cred, l, &VFid, &attr); 1064 1065 if (!error) { 1066 1067 /* 1068 * XXX Violation of venus/kernel invariants is a difficult case, 1069 * but venus should not be able to cause a panic. 1070 */ 1071 /* If this is an exclusive create, panic if the file already exists. */ 1072 /* Venus should have detected the file and reported EEXIST. */ 1073 1074 if ((exclusive == 1) && 1075 (coda_find(&VFid) != NULL)) 1076 panic("cnode existed for newly created file!"); 1077 1078 cp = make_coda_node(&VFid, dvp->v_mount, attr.va_type); 1079 *vpp = CTOV(cp); 1080 1081 /* XXX vnodeops doesn't say this argument can be changed. */ 1082 /* Update va to reflect the new attributes. */ 1083 (*va) = attr; 1084 1085 /* Update the attribute cache and mark it as valid */ 1086 if (coda_attr_cache) { 1087 VTOC(*vpp)->c_vattr = attr; 1088 VTOC(*vpp)->c_flags |= C_VATTR; 1089 } 1090 1091 /* Invalidate parent's attr cache (modification time has changed). */ 1092 VTOC(dvp)->c_flags &= ~C_VATTR; 1093 1094 /* enter the new vnode in the Name Cache */ 1095 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1096 1097 CODADEBUG(CODA_CREATE, myprintf(("%s: %s, result %d\n", __func__, 1098 coda_f2s(&VFid), error)); ) 1099 } else { 1100 *vpp = (vnode_t *)0; 1101 CODADEBUG(CODA_CREATE, myprintf(("create error %d\n", error));) 1102 } 1103 1104 /* 1105 * vnodeops(9) says that we must unlock the parent and lock the child. 1106 * XXX Should we lock the child first? 1107 */ 1108 vput(dvp); 1109 if (!error) { 1110 if ((cnp->cn_flags & LOCKLEAF) == 0) { 1111 /* This should not happen; flags are for lookup only. */ 1112 printf("%s: LOCKLEAF not set!\n", __func__); 1113 } 1114 1115 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { 1116 /* XXX Perhaps avoid this panic. */ 1117 panic("%s: couldn't lock child", __func__); 1118 } 1119 } 1120 1121 return(error); 1122 } 1123 1124 int 1125 coda_remove(void *v) 1126 { 1127 /* true args */ 1128 struct vop_remove_args *ap = v; 1129 vnode_t *dvp = ap->a_dvp; 1130 struct cnode *cp = VTOC(dvp); 1131 vnode_t *vp = ap->a_vp; 1132 struct componentname *cnp = ap->a_cnp; 1133 kauth_cred_t cred = cnp->cn_cred; 1134 struct lwp *l = curlwp; 1135 /* locals */ 1136 int error; 1137 const char *nm = cnp->cn_nameptr; 1138 int len = cnp->cn_namelen; 1139 struct cnode *tp; 1140 1141 MARK_ENTRY(CODA_REMOVE_STATS); 1142 1143 CODADEBUG(CODA_REMOVE, myprintf(("%s: %s in %s\n", __func__, 1144 nm, coda_f2s(&cp->c_fid)));) 1145 1146 /* Remove the file's entry from the CODA Name Cache */ 1147 /* We're being conservative here, it might be that this person 1148 * doesn't really have sufficient access to delete the file 1149 * but we feel zapping the entry won't really hurt anyone -- dcs 1150 */ 1151 /* I'm gonna go out on a limb here. If a file and a hardlink to it 1152 * exist, and one is removed, the link count on the other will be 1153 * off by 1. We could either invalidate the attrs if cached, or 1154 * fix them. I'll try to fix them. DCS 11/8/94 1155 */ 1156 tp = coda_nc_lookup(VTOC(dvp), nm, len, cred); 1157 if (tp) { 1158 if (VALID_VATTR(tp)) { /* If attrs are cached */ 1159 if (tp->c_vattr.va_nlink > 1) { /* If it's a hard link */ 1160 tp->c_vattr.va_nlink--; 1161 } 1162 } 1163 1164 coda_nc_zapfile(VTOC(dvp), nm, len); 1165 /* No need to flush it if it doesn't exist! */ 1166 } 1167 /* Invalidate the parent's attr cache, the modification time has changed */ 1168 VTOC(dvp)->c_flags &= ~C_VATTR; 1169 1170 /* Check for remove of control object. */ 1171 if (IS_CTL_NAME(dvp, nm, len)) { 1172 MARK_INT_FAIL(CODA_REMOVE_STATS); 1173 return(ENOENT); 1174 } 1175 1176 error = venus_remove(vtomi(dvp), &cp->c_fid, nm, len, cred, l); 1177 1178 CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n",error)); ) 1179 1180 /* 1181 * Unlock parent and child (avoiding double if "."). 1182 */ 1183 if (dvp == vp) { 1184 vrele(vp); 1185 } else { 1186 vput(vp); 1187 } 1188 vput(dvp); 1189 1190 return(error); 1191 } 1192 1193 /* 1194 * dvp is the directory where the link is to go, and is locked. 1195 * vp is the object to be linked to, and is unlocked. 1196 * At exit, we must unlock dvp, and vput dvp. 1197 */ 1198 int 1199 coda_link(void *v) 1200 { 1201 /* true args */ 1202 struct vop_link_args *ap = v; 1203 vnode_t *vp = ap->a_vp; 1204 struct cnode *cp = VTOC(vp); 1205 vnode_t *dvp = ap->a_dvp; 1206 struct cnode *dcp = VTOC(dvp); 1207 struct componentname *cnp = ap->a_cnp; 1208 kauth_cred_t cred = cnp->cn_cred; 1209 struct lwp *l = curlwp; 1210 /* locals */ 1211 int error; 1212 const char *nm = cnp->cn_nameptr; 1213 int len = cnp->cn_namelen; 1214 1215 MARK_ENTRY(CODA_LINK_STATS); 1216 1217 if (codadebug & CODADBGMSK(CODA_LINK)) { 1218 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 if (codadebug & CODADBGMSK(CODA_LINK)) { 1224 myprintf(("%s: vp fid: %s\n", __func__, coda_f2s(&cp->c_fid))); 1225 myprintf(("%s: dvp fid: %s\n", __func__, coda_f2s(&dcp->c_fid))); 1226 1227 } 1228 1229 /* Check for link to/from control object. */ 1230 if (IS_CTL_NAME(dvp, nm, len) || IS_CTL_VP(vp)) { 1231 MARK_INT_FAIL(CODA_LINK_STATS); 1232 return(EACCES); 1233 } 1234 1235 /* If linking . to a name, error out earlier. */ 1236 if (vp == dvp) { 1237 printf("coda_link vp==dvp\n"); 1238 error = EISDIR; 1239 goto exit; 1240 } 1241 1242 /* XXX Why does venus_link need the vnode to be locked?*/ 1243 if ((error = vn_lock(vp, LK_EXCLUSIVE)) != 0) { 1244 printf("%s: couldn't lock vnode %p\n", __func__, vp); 1245 error = EFAULT; /* XXX better value */ 1246 goto exit; 1247 } 1248 error = venus_link(vtomi(vp), &cp->c_fid, &dcp->c_fid, nm, len, cred, l); 1249 VOP_UNLOCK(vp); 1250 1251 /* Invalidate parent's attr cache (the modification time has changed). */ 1252 VTOC(dvp)->c_flags &= ~C_VATTR; 1253 /* Invalidate child's attr cache (XXX why). */ 1254 VTOC(vp)->c_flags &= ~C_VATTR; 1255 1256 CODADEBUG(CODA_LINK, myprintf(("in link result %d\n",error)); ) 1257 1258 exit: 1259 vput(dvp); 1260 return(error); 1261 } 1262 1263 int 1264 coda_rename(void *v) 1265 { 1266 /* true args */ 1267 struct vop_rename_args *ap = v; 1268 vnode_t *odvp = ap->a_fdvp; 1269 struct cnode *odcp = VTOC(odvp); 1270 struct componentname *fcnp = ap->a_fcnp; 1271 vnode_t *ndvp = ap->a_tdvp; 1272 struct cnode *ndcp = VTOC(ndvp); 1273 struct componentname *tcnp = ap->a_tcnp; 1274 kauth_cred_t cred = fcnp->cn_cred; 1275 struct lwp *l = curlwp; 1276 /* true args */ 1277 int error; 1278 const char *fnm = fcnp->cn_nameptr; 1279 int flen = fcnp->cn_namelen; 1280 const char *tnm = tcnp->cn_nameptr; 1281 int tlen = tcnp->cn_namelen; 1282 1283 MARK_ENTRY(CODA_RENAME_STATS); 1284 1285 /* Hmmm. The vnodes are already looked up. Perhaps they are locked? 1286 This could be Bad. XXX */ 1287 #ifdef OLD_DIAGNOSTIC 1288 if ((fcnp->cn_cred != tcnp->cn_cred) 1289 || (fcnp->cn_lwp != tcnp->cn_lwp)) 1290 { 1291 panic("%s: component names don't agree", __func__); 1292 } 1293 #endif 1294 1295 /* Check for rename involving control object. */ 1296 if (IS_CTL_NAME(odvp, fnm, flen) || IS_CTL_NAME(ndvp, tnm, tlen)) { 1297 MARK_INT_FAIL(CODA_RENAME_STATS); 1298 return(EACCES); 1299 } 1300 1301 /* Problem with moving directories -- need to flush entry for .. */ 1302 if (odvp != ndvp) { 1303 struct cnode *ovcp = coda_nc_lookup(VTOC(odvp), fnm, flen, cred); 1304 if (ovcp) { 1305 vnode_t *ovp = CTOV(ovcp); 1306 if ((ovp) && 1307 (ovp->v_type == VDIR)) /* If it's a directory */ 1308 coda_nc_zapfile(VTOC(ovp),"..", 2); 1309 } 1310 } 1311 1312 /* Remove the entries for both source and target files */ 1313 coda_nc_zapfile(VTOC(odvp), fnm, flen); 1314 coda_nc_zapfile(VTOC(ndvp), tnm, tlen); 1315 1316 /* Invalidate the parent's attr cache, the modification time has changed */ 1317 VTOC(odvp)->c_flags &= ~C_VATTR; 1318 VTOC(ndvp)->c_flags &= ~C_VATTR; 1319 1320 if (flen+1 > CODA_MAXNAMLEN) { 1321 MARK_INT_FAIL(CODA_RENAME_STATS); 1322 error = EINVAL; 1323 goto exit; 1324 } 1325 1326 if (tlen+1 > CODA_MAXNAMLEN) { 1327 MARK_INT_FAIL(CODA_RENAME_STATS); 1328 error = EINVAL; 1329 goto exit; 1330 } 1331 1332 error = venus_rename(vtomi(odvp), &odcp->c_fid, &ndcp->c_fid, fnm, flen, tnm, tlen, cred, l); 1333 1334 exit: 1335 CODADEBUG(CODA_RENAME, myprintf(("in rename result %d\n",error));) 1336 /* XXX - do we need to call cache pureg on the moved vnode? */ 1337 cache_purge(ap->a_fvp); 1338 1339 /* It seems to be incumbent on us to drop locks on all four vnodes */ 1340 /* From-vnodes are not locked, only ref'd. To-vnodes are locked. */ 1341 1342 vrele(ap->a_fvp); 1343 vrele(odvp); 1344 1345 if (ap->a_tvp) { 1346 if (ap->a_tvp == ndvp) { 1347 vrele(ap->a_tvp); 1348 } else { 1349 vput(ap->a_tvp); 1350 } 1351 } 1352 1353 vput(ndvp); 1354 return(error); 1355 } 1356 1357 int 1358 coda_mkdir(void *v) 1359 { 1360 /* true args */ 1361 struct vop_mkdir_args *ap = v; 1362 vnode_t *dvp = ap->a_dvp; 1363 struct cnode *dcp = VTOC(dvp); 1364 struct componentname *cnp = ap->a_cnp; 1365 struct vattr *va = ap->a_vap; 1366 vnode_t **vpp = ap->a_vpp; 1367 kauth_cred_t cred = cnp->cn_cred; 1368 struct lwp *l = curlwp; 1369 /* locals */ 1370 int error; 1371 const char *nm = cnp->cn_nameptr; 1372 int len = cnp->cn_namelen; 1373 struct cnode *cp; 1374 CodaFid VFid; 1375 struct vattr ova; 1376 1377 MARK_ENTRY(CODA_MKDIR_STATS); 1378 1379 /* Check for mkdir of target object. */ 1380 if (IS_CTL_NAME(dvp, nm, len)) { 1381 *vpp = (vnode_t *)0; 1382 MARK_INT_FAIL(CODA_MKDIR_STATS); 1383 return(EACCES); 1384 } 1385 1386 if (len+1 > CODA_MAXNAMLEN) { 1387 *vpp = (vnode_t *)0; 1388 MARK_INT_FAIL(CODA_MKDIR_STATS); 1389 return(EACCES); 1390 } 1391 1392 error = venus_mkdir(vtomi(dvp), &dcp->c_fid, nm, len, va, cred, l, &VFid, &ova); 1393 1394 if (!error) { 1395 if (coda_find(&VFid) != NULL) 1396 panic("cnode existed for newly created directory!"); 1397 1398 1399 cp = make_coda_node(&VFid, dvp->v_mount, va->va_type); 1400 *vpp = CTOV(cp); 1401 1402 /* enter the new vnode in the Name Cache */ 1403 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1404 1405 /* as a side effect, enter "." and ".." for the directory */ 1406 coda_nc_enter(VTOC(*vpp), ".", 1, cred, VTOC(*vpp)); 1407 coda_nc_enter(VTOC(*vpp), "..", 2, cred, VTOC(dvp)); 1408 1409 if (coda_attr_cache) { 1410 VTOC(*vpp)->c_vattr = ova; /* update the attr cache */ 1411 VTOC(*vpp)->c_flags |= C_VATTR; /* Valid attributes in cnode */ 1412 } 1413 1414 /* Invalidate the parent's attr cache, the modification time has changed */ 1415 VTOC(dvp)->c_flags &= ~C_VATTR; 1416 1417 CODADEBUG( CODA_MKDIR, myprintf(("%s: %s result %d\n", __func__, 1418 coda_f2s(&VFid), error)); ) 1419 } else { 1420 *vpp = (vnode_t *)0; 1421 CODADEBUG(CODA_MKDIR, myprintf(("%s error %d\n", __func__, error));) 1422 } 1423 1424 /* 1425 * Currently, all mkdirs explicitly vput their dvp's. 1426 * It also appears that we *must* lock the vpp, since 1427 * lockleaf isn't set, but someone down the road is going 1428 * to try to unlock the new directory. 1429 */ 1430 vput(dvp); 1431 if (!error) { 1432 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { 1433 panic("%s: couldn't lock child", __func__); 1434 } 1435 } 1436 1437 return(error); 1438 } 1439 1440 int 1441 coda_rmdir(void *v) 1442 { 1443 /* true args */ 1444 struct vop_rmdir_args *ap = v; 1445 vnode_t *dvp = ap->a_dvp; 1446 struct cnode *dcp = VTOC(dvp); 1447 vnode_t *vp = ap->a_vp; 1448 struct componentname *cnp = ap->a_cnp; 1449 kauth_cred_t cred = cnp->cn_cred; 1450 struct lwp *l = curlwp; 1451 /* true args */ 1452 int error; 1453 const char *nm = cnp->cn_nameptr; 1454 int len = cnp->cn_namelen; 1455 struct cnode *cp; 1456 1457 MARK_ENTRY(CODA_RMDIR_STATS); 1458 1459 /* Check for rmdir of control object. */ 1460 if (IS_CTL_NAME(dvp, nm, len)) { 1461 MARK_INT_FAIL(CODA_RMDIR_STATS); 1462 return(ENOENT); 1463 } 1464 1465 /* Can't remove . in self. */ 1466 if (dvp == vp) { 1467 printf("%s: dvp == vp\n", __func__); 1468 error = EINVAL; 1469 goto exit; 1470 } 1471 1472 /* 1473 * The caller may not have adequate permissions, and the venus 1474 * operation may fail, but it doesn't hurt from a correctness 1475 * viewpoint to invalidate cache entries. 1476 * XXX Why isn't this done after the venus_rmdir call? 1477 */ 1478 /* Look up child in name cache (by name, from parent). */ 1479 cp = coda_nc_lookup(dcp, nm, len, cred); 1480 /* If found, remove all children of the child (., ..). */ 1481 if (cp) coda_nc_zapParentfid(&(cp->c_fid), NOT_DOWNCALL); 1482 1483 /* Remove child's own entry. */ 1484 coda_nc_zapfile(dcp, nm, len); 1485 1486 /* Invalidate parent's attr cache (the modification time has changed). */ 1487 dcp->c_flags &= ~C_VATTR; 1488 1489 error = venus_rmdir(vtomi(dvp), &dcp->c_fid, nm, len, cred, l); 1490 1491 CODADEBUG(CODA_RMDIR, myprintf(("in rmdir result %d\n", error)); ) 1492 1493 exit: 1494 /* vput both vnodes */ 1495 vput(dvp); 1496 if (dvp == vp) { 1497 vrele(vp); 1498 } else { 1499 vput(vp); 1500 } 1501 1502 return(error); 1503 } 1504 1505 int 1506 coda_symlink(void *v) 1507 { 1508 /* true args */ 1509 struct vop_symlink_args *ap = v; 1510 vnode_t *dvp = ap->a_dvp; 1511 struct cnode *dcp = VTOC(dvp); 1512 /* a_vpp is used in place below */ 1513 struct componentname *cnp = ap->a_cnp; 1514 struct vattr *tva = ap->a_vap; 1515 char *path = ap->a_target; 1516 kauth_cred_t cred = cnp->cn_cred; 1517 struct lwp *l = curlwp; 1518 /* locals */ 1519 int error; 1520 u_long saved_cn_flags; 1521 const char *nm = cnp->cn_nameptr; 1522 int len = cnp->cn_namelen; 1523 int plen = strlen(path); 1524 1525 /* 1526 * Here's the strategy for the moment: perform the symlink, then 1527 * do a lookup to grab the resulting vnode. I know this requires 1528 * two communications with Venus for a new sybolic link, but 1529 * that's the way the ball bounces. I don't yet want to change 1530 * the way the Mach symlink works. When Mach support is 1531 * deprecated, we should change symlink so that the common case 1532 * returns the resultant vnode in a vpp argument. 1533 */ 1534 1535 MARK_ENTRY(CODA_SYMLINK_STATS); 1536 1537 /* Check for symlink of control object. */ 1538 if (IS_CTL_NAME(dvp, nm, len)) { 1539 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1540 error = EACCES; 1541 goto exit; 1542 } 1543 1544 if (plen+1 > CODA_MAXPATHLEN) { 1545 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1546 error = EINVAL; 1547 goto exit; 1548 } 1549 1550 if (len+1 > CODA_MAXNAMLEN) { 1551 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1552 error = EINVAL; 1553 goto exit; 1554 } 1555 1556 error = venus_symlink(vtomi(dvp), &dcp->c_fid, path, plen, nm, len, tva, cred, l); 1557 1558 /* Invalidate the parent's attr cache (modification time has changed). */ 1559 dcp->c_flags &= ~C_VATTR; 1560 1561 if (!error) { 1562 /* 1563 * VOP_SYMLINK is not defined to pay attention to cnp->cn_flags; 1564 * these are defined only for VOP_LOOKUP. We desire to reuse 1565 * cnp for a VOP_LOOKUP operation, and must be sure to not pass 1566 * stray flags passed to us. Such stray flags can occur because 1567 * sys_symlink makes a namei call and then reuses the 1568 * componentname structure. 1569 */ 1570 /* 1571 * XXX Arguably we should create our own componentname structure 1572 * and not reuse the one that was passed in. 1573 */ 1574 saved_cn_flags = cnp->cn_flags; 1575 cnp->cn_flags &= ~(MODMASK | OPMASK); 1576 cnp->cn_flags |= LOOKUP; 1577 error = VOP_LOOKUP(dvp, ap->a_vpp, cnp); 1578 cnp->cn_flags = saved_cn_flags; 1579 /* Either an error occurs, or ap->a_vpp is locked. */ 1580 } 1581 1582 exit: 1583 /* unlock and deference parent */ 1584 vput(dvp); 1585 1586 CODADEBUG(CODA_SYMLINK, myprintf(("in symlink result %d\n",error)); ) 1587 return(error); 1588 } 1589 1590 /* 1591 * Read directory entries. 1592 */ 1593 int 1594 coda_readdir(void *v) 1595 { 1596 /* true args */ 1597 struct vop_readdir_args *ap = v; 1598 vnode_t *vp = ap->a_vp; 1599 struct cnode *cp = VTOC(vp); 1600 struct uio *uiop = ap->a_uio; 1601 kauth_cred_t cred = ap->a_cred; 1602 int *eofflag = ap->a_eofflag; 1603 off_t **cookies = ap->a_cookies; 1604 int *ncookies = ap->a_ncookies; 1605 /* upcall decl */ 1606 /* locals */ 1607 int error = 0; 1608 1609 MARK_ENTRY(CODA_READDIR_STATS); 1610 1611 CODADEBUG(CODA_READDIR, myprintf(("%s: (%p, %lu, %lld)\n", __func__, 1612 uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, 1613 (long long) uiop->uio_offset)); ) 1614 1615 /* Check for readdir of control object. */ 1616 if (IS_CTL_VP(vp)) { 1617 MARK_INT_FAIL(CODA_READDIR_STATS); 1618 return(ENOENT); 1619 } 1620 1621 { 1622 /* Redirect the request to UFS. */ 1623 1624 /* If directory is not already open do an "internal open" on it. */ 1625 int opened_internally = 0; 1626 if (cp->c_ovp == NULL) { 1627 opened_internally = 1; 1628 MARK_INT_GEN(CODA_OPEN_STATS); 1629 error = VOP_OPEN(vp, FREAD, cred); 1630 #ifdef CODA_VERBOSE 1631 printf("%s: Internally Opening %p\n", __func__, vp); 1632 #endif 1633 if (error) return(error); 1634 } else 1635 vp = cp->c_ovp; 1636 1637 /* Have UFS handle the call. */ 1638 CODADEBUG(CODA_READDIR, myprintf(("%s: fid = %s, refcnt = %d\n", 1639 __func__, coda_f2s(&cp->c_fid), vp->v_usecount)); ) 1640 error = VOP_READDIR(vp, uiop, cred, eofflag, cookies, ncookies); 1641 if (error) 1642 MARK_INT_FAIL(CODA_READDIR_STATS); 1643 else 1644 MARK_INT_SAT(CODA_READDIR_STATS); 1645 1646 /* Do an "internal close" if necessary. */ 1647 if (opened_internally) { 1648 MARK_INT_GEN(CODA_CLOSE_STATS); 1649 (void)VOP_CLOSE(vp, FREAD, cred); 1650 } 1651 } 1652 1653 return(error); 1654 } 1655 1656 /* 1657 * Convert from file system blocks to device blocks 1658 */ 1659 int 1660 coda_bmap(void *v) 1661 { 1662 /* XXX on the global proc */ 1663 /* true args */ 1664 struct vop_bmap_args *ap = v; 1665 vnode_t *vp __unused = ap->a_vp; /* file's vnode */ 1666 daddr_t bn __unused = ap->a_bn; /* fs block number */ 1667 vnode_t **vpp = ap->a_vpp; /* RETURN vp of device */ 1668 daddr_t *bnp __unused = ap->a_bnp; /* RETURN device block number */ 1669 struct lwp *l __unused = curlwp; 1670 /* upcall decl */ 1671 /* locals */ 1672 1673 *vpp = (vnode_t *)0; 1674 myprintf(("coda_bmap called!\n")); 1675 return(EINVAL); 1676 } 1677 1678 /* 1679 * I don't think the following two things are used anywhere, so I've 1680 * commented them out 1681 * 1682 * struct buf *async_bufhead; 1683 * int async_daemon_count; 1684 */ 1685 int 1686 coda_strategy(void *v) 1687 { 1688 /* true args */ 1689 struct vop_strategy_args *ap = v; 1690 struct buf *bp __unused = ap->a_bp; 1691 struct lwp *l __unused = curlwp; 1692 /* upcall decl */ 1693 /* locals */ 1694 1695 myprintf(("coda_strategy called! ")); 1696 return(EINVAL); 1697 } 1698 1699 int 1700 coda_reclaim(void *v) 1701 { 1702 /* true args */ 1703 struct vop_reclaim_args *ap = v; 1704 vnode_t *vp = ap->a_vp; 1705 struct cnode *cp = VTOC(vp); 1706 /* upcall decl */ 1707 /* locals */ 1708 1709 /* 1710 * Forced unmount/flush will let vnodes with non zero use be destroyed! 1711 */ 1712 ENTRY; 1713 1714 if (IS_UNMOUNTING(cp)) { 1715 #ifdef DEBUG 1716 if (VTOC(vp)->c_ovp) { 1717 if (IS_UNMOUNTING(cp)) 1718 printf("%s: c_ovp not void: vp %p, cp %p\n", __func__, vp, cp); 1719 } 1720 #endif 1721 } else { 1722 #ifdef OLD_DIAGNOSTIC 1723 if (vp->v_usecount != 0) 1724 print("%s: pushing active %p\n", __func__, vp); 1725 if (VTOC(vp)->c_ovp) { 1726 panic("%s: c_ovp not void", __func__); 1727 } 1728 #endif 1729 } 1730 coda_free(VTOC(vp)); 1731 SET_VTOC(vp) = NULL; 1732 return (0); 1733 } 1734 1735 int 1736 coda_lock(void *v) 1737 { 1738 /* true args */ 1739 struct vop_lock_args *ap = v; 1740 vnode_t *vp = ap->a_vp; 1741 struct cnode *cp = VTOC(vp); 1742 /* upcall decl */ 1743 /* locals */ 1744 1745 ENTRY; 1746 1747 if (coda_lockdebug) { 1748 myprintf(("Attempting lock on %s\n", 1749 coda_f2s(&cp->c_fid))); 1750 } 1751 1752 return genfs_lock(v); 1753 } 1754 1755 int 1756 coda_unlock(void *v) 1757 { 1758 /* true args */ 1759 struct vop_unlock_args *ap = v; 1760 vnode_t *vp = ap->a_vp; 1761 struct cnode *cp = VTOC(vp); 1762 /* upcall decl */ 1763 /* locals */ 1764 1765 ENTRY; 1766 if (coda_lockdebug) { 1767 myprintf(("Attempting unlock on %s\n", 1768 coda_f2s(&cp->c_fid))); 1769 } 1770 1771 return genfs_unlock(v); 1772 } 1773 1774 int 1775 coda_islocked(void *v) 1776 { 1777 /* true args */ 1778 ENTRY; 1779 1780 return genfs_islocked(v); 1781 } 1782 1783 /* 1784 * Given a device and inode, obtain a locked vnode. One reference is 1785 * obtained and passed back to the caller. 1786 */ 1787 int 1788 coda_grab_vnode(vnode_t *uvp, dev_t dev, ino_t ino, vnode_t **vpp) 1789 { 1790 int error; 1791 struct mount *mp; 1792 1793 /* Obtain mount point structure from device. */ 1794 if (!(mp = devtomp(dev))) { 1795 myprintf(("%s: devtomp(0x%llx) returns NULL\n", __func__, 1796 (unsigned long long)dev)); 1797 return(ENXIO); 1798 } 1799 1800 /* 1801 * Obtain vnode from mount point and inode. 1802 * XXX VFS_VGET does not clearly define locked/referenced state of 1803 * returned vnode. 1804 */ 1805 error = VFS_VGET(mp, ino, vpp); 1806 if (error) { 1807 myprintf(("%s: iget/vget(0x%llx, %llu) returns %p, err %d\n", __func__, 1808 (unsigned long long)dev, (unsigned long long)ino, *vpp, error)); 1809 return(ENOENT); 1810 } 1811 /* share the underlying vnode lock with the coda vnode */ 1812 mutex_obj_hold((*vpp)->v_interlock); 1813 uvm_obj_setlock(&uvp->v_uobj, (*vpp)->v_interlock); 1814 return(0); 1815 } 1816 1817 void 1818 print_vattr(struct vattr *attr) 1819 { 1820 const char *typestr; 1821 1822 switch (attr->va_type) { 1823 case VNON: 1824 typestr = "VNON"; 1825 break; 1826 case VREG: 1827 typestr = "VREG"; 1828 break; 1829 case VDIR: 1830 typestr = "VDIR"; 1831 break; 1832 case VBLK: 1833 typestr = "VBLK"; 1834 break; 1835 case VCHR: 1836 typestr = "VCHR"; 1837 break; 1838 case VLNK: 1839 typestr = "VLNK"; 1840 break; 1841 case VSOCK: 1842 typestr = "VSCK"; 1843 break; 1844 case VFIFO: 1845 typestr = "VFFO"; 1846 break; 1847 case VBAD: 1848 typestr = "VBAD"; 1849 break; 1850 default: 1851 typestr = "????"; 1852 break; 1853 } 1854 1855 1856 myprintf(("attr: type %s mode %d uid %d gid %d fsid %d rdev %d\n", 1857 typestr, (int)attr->va_mode, (int)attr->va_uid, 1858 (int)attr->va_gid, (int)attr->va_fsid, (int)attr->va_rdev)); 1859 1860 myprintf((" fileid %d nlink %d size %d blocksize %d bytes %d\n", 1861 (int)attr->va_fileid, (int)attr->va_nlink, 1862 (int)attr->va_size, 1863 (int)attr->va_blocksize,(int)attr->va_bytes)); 1864 myprintf((" gen %ld flags %ld vaflags %d\n", 1865 attr->va_gen, attr->va_flags, attr->va_vaflags)); 1866 myprintf((" atime sec %d nsec %d\n", 1867 (int)attr->va_atime.tv_sec, (int)attr->va_atime.tv_nsec)); 1868 myprintf((" mtime sec %d nsec %d\n", 1869 (int)attr->va_mtime.tv_sec, (int)attr->va_mtime.tv_nsec)); 1870 myprintf((" ctime sec %d nsec %d\n", 1871 (int)attr->va_ctime.tv_sec, (int)attr->va_ctime.tv_nsec)); 1872 } 1873 1874 /* How to print a ucred */ 1875 void 1876 print_cred(kauth_cred_t cred) 1877 { 1878 1879 uint16_t ngroups; 1880 int i; 1881 1882 myprintf(("ref %d\tuid %d\n", kauth_cred_getrefcnt(cred), 1883 kauth_cred_geteuid(cred))); 1884 1885 ngroups = kauth_cred_ngroups(cred); 1886 for (i=0; i < ngroups; i++) 1887 myprintf(("\tgroup %d: (%d)\n", i, kauth_cred_group(cred, i))); 1888 myprintf(("\n")); 1889 1890 } 1891 1892 /* 1893 * Return a vnode for the given fid. 1894 * If no cnode exists for this fid create one and put it 1895 * in a table hashed by coda_f2i(). If the cnode for 1896 * this fid is already in the table return it (ref count is 1897 * incremented by coda_find. The cnode will be flushed from the 1898 * table when coda_inactive calls coda_unsave. 1899 */ 1900 struct cnode * 1901 make_coda_node(CodaFid *fid, struct mount *vfsp, short type) 1902 { 1903 struct cnode *cp; 1904 int err; 1905 1906 if ((cp = coda_find(fid)) == NULL) { 1907 vnode_t *vp; 1908 1909 cp = coda_alloc(); 1910 cp->c_fid = *fid; 1911 1912 err = getnewvnode(VT_CODA, vfsp, coda_vnodeop_p, NULL, &vp); 1913 if (err) { 1914 panic("%s: getnewvnode returned error %d", __func__, err); 1915 } 1916 vp->v_data = cp; 1917 vp->v_type = type; 1918 cp->c_vnode = vp; 1919 uvm_vnp_setsize(vp, 0); 1920 coda_save(cp); 1921 1922 } else { 1923 vref(CTOV(cp)); 1924 } 1925 1926 return cp; 1927 } 1928 1929 /* 1930 * coda_getpages may be called on a vnode which has not been opened, 1931 * e.g. to fault in pages to execute a program. In that case, we must 1932 * open the file to get the container. The vnode may or may not be 1933 * locked, and we must leave it in the same state. 1934 */ 1935 int 1936 coda_getpages(void *v) 1937 { 1938 struct vop_getpages_args /* { 1939 vnode_t *a_vp; 1940 voff_t a_offset; 1941 struct vm_page **a_m; 1942 int *a_count; 1943 int a_centeridx; 1944 vm_prot_t a_access_type; 1945 int a_advice; 1946 int a_flags; 1947 } */ *ap = v; 1948 vnode_t *vp = ap->a_vp, *cvp; 1949 struct cnode *cp = VTOC(vp); 1950 struct lwp *l = curlwp; 1951 kauth_cred_t cred = l->l_cred; 1952 int error, cerror; 1953 int waslocked; /* 1 if vnode lock was held on entry */ 1954 int didopen = 0; /* 1 if we opened container file */ 1955 1956 KASSERT(mutex_owned(vp->v_interlock)); 1957 1958 /* 1959 * Handle a case that uvm_fault doesn't quite use yet. 1960 * See layer_vnops.c. for inspiration. 1961 */ 1962 if (ap->a_flags & PGO_LOCKED) { 1963 return EBUSY; 1964 } 1965 1966 /* Check for control object. */ 1967 if (IS_CTL_VP(vp)) { 1968 printf("%s: control object %p\n", __func__, vp); 1969 return(EINVAL); 1970 } 1971 1972 /* 1973 * XXX It's really not ok to be releasing the lock we get, 1974 * because we could be overlapping with another call to 1975 * getpages and drop a lock they are relying on. We need to 1976 * figure out whether getpages ever is called holding the 1977 * lock, and if we should serialize getpages calls by some 1978 * mechanism. 1979 */ 1980 /* XXX VOP_ISLOCKED() may not be used for lock decisions. */ 1981 waslocked = VOP_ISLOCKED(vp); 1982 1983 /* Get container file if not already present. */ 1984 cvp = cp->c_ovp; 1985 if (cvp == NULL) { 1986 /* 1987 * VOP_OPEN requires a locked vnode. We must avoid 1988 * locking the vnode if it is already locked, and 1989 * leave it in the same state on exit. 1990 */ 1991 if (waslocked == 0) { 1992 cerror = vn_lock(vp, LK_EXCLUSIVE); 1993 if (cerror) { 1994 printf("%s: can't lock vnode %p\n", 1995 __func__, vp); 1996 return cerror; 1997 } 1998 #if 0 1999 printf("%s: locked vnode %p\n", __func__, vp); 2000 #endif 2001 } 2002 2003 /* 2004 * Open file (causes upcall to venus). 2005 * XXX Perhaps we should not fully open the file, but 2006 * simply obtain a container file. 2007 */ 2008 /* XXX Is it ok to do this while holding the simplelock? */ 2009 cerror = VOP_OPEN(vp, FREAD, cred); 2010 2011 if (cerror) { 2012 printf("%s: cannot open vnode %p => %d\n", __func__, 2013 vp, cerror); 2014 if (waslocked == 0) 2015 VOP_UNLOCK(vp); 2016 return cerror; 2017 } 2018 2019 #if 0 2020 printf("%s: opened vnode %p\n", __func__, vp); 2021 #endif 2022 cvp = cp->c_ovp; 2023 didopen = 1; 2024 } 2025 KASSERT(cvp != NULL); 2026 2027 /* Munge the arg structure to refer to the container vnode. */ 2028 KASSERT(cvp->v_interlock == vp->v_interlock); 2029 ap->a_vp = cp->c_ovp; 2030 2031 /* Finally, call getpages on it. */ 2032 error = VCALL(ap->a_vp, VOFFSET(vop_getpages), ap); 2033 2034 /* If we opened the vnode, we must close it. */ 2035 if (didopen) { 2036 /* 2037 * VOP_CLOSE requires a locked vnode, but we are still 2038 * holding the lock (or riding a caller's lock). 2039 */ 2040 cerror = VOP_CLOSE(vp, FREAD, cred); 2041 if (cerror != 0) 2042 /* XXX How should we handle this? */ 2043 printf("%s: closed vnode %p -> %d\n", __func__, 2044 vp, cerror); 2045 2046 /* If we obtained a lock, drop it. */ 2047 if (waslocked == 0) 2048 VOP_UNLOCK(vp); 2049 } 2050 2051 return error; 2052 } 2053 2054 /* 2055 * The protocol requires v_interlock to be held by the caller. 2056 */ 2057 int 2058 coda_putpages(void *v) 2059 { 2060 struct vop_putpages_args /* { 2061 vnode_t *a_vp; 2062 voff_t a_offlo; 2063 voff_t a_offhi; 2064 int a_flags; 2065 } */ *ap = v; 2066 vnode_t *vp = ap->a_vp, *cvp; 2067 struct cnode *cp = VTOC(vp); 2068 int error; 2069 2070 KASSERT(mutex_owned(vp->v_interlock)); 2071 2072 /* Check for control object. */ 2073 if (IS_CTL_VP(vp)) { 2074 mutex_exit(vp->v_interlock); 2075 printf("%s: control object %p\n", __func__, vp); 2076 return(EINVAL); 2077 } 2078 2079 /* 2080 * If container object is not present, then there are no pages 2081 * to put; just return without error. This happens all the 2082 * time, apparently during discard of a closed vnode (which 2083 * trivially can't have dirty pages). 2084 */ 2085 cvp = cp->c_ovp; 2086 if (cvp == NULL) { 2087 mutex_exit(vp->v_interlock); 2088 return 0; 2089 } 2090 2091 /* Munge the arg structure to refer to the container vnode. */ 2092 KASSERT(cvp->v_interlock == vp->v_interlock); 2093 ap->a_vp = cvp; 2094 2095 /* Finally, call putpages on it. */ 2096 error = VCALL(ap->a_vp, VOFFSET(vop_putpages), ap); 2097 2098 return error; 2099 } 2100
Indexes created Thu Oct 16 14:10:15 GMT 2025