coda_vnops.c revision 1.83
1 /* $NetBSD: coda_vnops.c,v 1.83 2012/04/28 20:01:09 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 1.83 2012/04/28 20:01:09 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(("coda_vop_error: Vnode operation %s called (error).\n", 157 (*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 struct vnode *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 struct vnode *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, 245 myprintf(("open: dev 0x%llx inode %llu result %d\n", 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("coda_open: cp->c_ovp != container_vp"); 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 struct vnode *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("coda_close: destroying container ref %d, ufs vp %p of vp %p/cp %p\n", 325 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("coda_close: NO container vp %p/cp %p\n", 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(("close: result %d\n",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(struct vnode *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 struct vnode *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, 399 (unsigned long) uiop->uio_resid, 400 (long long) uiop->uio_offset)); ) 401 402 /* Check for rdwr of control object. */ 403 if (IS_CTL_VP(vp)) { 404 MARK_INT_FAIL(CODA_RDWR_STATS); 405 return(EINVAL); 406 } 407 408 /* Redirect the request to UFS. */ 409 410 /* 411 * If file is not already open this must be a page 412 * {read,write} request. Iget the cache file's inode 413 * pointer if we still have its <device, inode> pair. 414 * Otherwise, we must do an internal open to derive the 415 * pair. 416 * XXX Integrate this into a coherent strategy for container 417 * file acquisition. 418 */ 419 if (cfvp == NULL) { 420 /* 421 * If we're dumping core, do the internal open. Otherwise 422 * venus won't have the correct size of the core when 423 * it's completely written. 424 */ 425 if (cp->c_inode != 0 && !(p && (p->p_acflag & ACORE))) { 426 printf("coda_rdwr: grabbing container vnode, losing reference\n"); 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("coda_rdwr: internal VOP_OPEN\n"); 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("coda_rdwr: Internally Opening %p\n", 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(("indirect rdwr: fid = %s, refcnt = %d\n", 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 struct vnode *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 struct vnode *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(("coda_ioctl error: vp != ctlvp"));) 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(("coda_ioctl error: lookup returns %d\n", 522 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, 535 myprintf(("coda_ioctl error: %s not a coda object\n", 536 iap->path));) 537 return(EINVAL); 538 } 539 540 if (iap->vi.in_size > VC_MAXDATASIZE || iap->vi.out_size > VC_MAXDATASIZE) { 541 vrele(tvp); 542 return(EINVAL); 543 } 544 error = venus_ioctl(vtomi(tvp), &((VTOC(tvp))->c_fid), com, flag, data, 545 cred, curlwp); 546 547 if (error) 548 MARK_INT_FAIL(CODA_IOCTL_STATS); 549 else 550 CODADEBUG(CODA_IOCTL, myprintf(("Ioctl returns %d \n", error)); ) 551 552 vrele(tvp); 553 return(error); 554 } 555 556 /* 557 * To reduce the cost of a user-level venus;we cache attributes in 558 * the kernel. Each cnode has storage allocated for an attribute. If 559 * c_vattr is valid, return a reference to it. Otherwise, get the 560 * attributes from venus and store them in the cnode. There is some 561 * question if this method is a security leak. But I think that in 562 * order to make this call, the user must have done a lookup and 563 * opened the file, and therefore should already have access. 564 */ 565 int 566 coda_getattr(void *v) 567 { 568 /* true args */ 569 struct vop_getattr_args *ap = v; 570 struct vnode *vp = ap->a_vp; 571 struct cnode *cp = VTOC(vp); 572 struct vattr *vap = ap->a_vap; 573 kauth_cred_t cred = ap->a_cred; 574 /* locals */ 575 int error; 576 577 MARK_ENTRY(CODA_GETATTR_STATS); 578 579 /* Check for getattr of control object. */ 580 if (IS_CTL_VP(vp)) { 581 MARK_INT_FAIL(CODA_GETATTR_STATS); 582 return(ENOENT); 583 } 584 585 /* Check to see if the attributes have already been cached */ 586 if (VALID_VATTR(cp)) { 587 CODADEBUG(CODA_GETATTR, { myprintf(("attr cache hit: %s\n", 588 coda_f2s(&cp->c_fid)));}); 589 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 590 print_vattr(&cp->c_vattr); ); 591 592 *vap = cp->c_vattr; 593 MARK_INT_SAT(CODA_GETATTR_STATS); 594 return(0); 595 } 596 597 error = venus_getattr(vtomi(vp), &cp->c_fid, cred, curlwp, vap); 598 599 if (!error) { 600 CODADEBUG(CODA_GETATTR, myprintf(("getattr miss %s: result %d\n", 601 coda_f2s(&cp->c_fid), error)); ) 602 603 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 604 print_vattr(vap); ); 605 606 /* If not open for write, store attributes in cnode */ 607 if ((cp->c_owrite == 0) && (coda_attr_cache)) { 608 cp->c_vattr = *vap; 609 cp->c_flags |= C_VATTR; 610 } 611 612 } 613 return(error); 614 } 615 616 int 617 coda_setattr(void *v) 618 { 619 /* true args */ 620 struct vop_setattr_args *ap = v; 621 struct vnode *vp = ap->a_vp; 622 struct cnode *cp = VTOC(vp); 623 struct vattr *vap = ap->a_vap; 624 kauth_cred_t cred = ap->a_cred; 625 /* locals */ 626 int error; 627 628 MARK_ENTRY(CODA_SETATTR_STATS); 629 630 /* Check for setattr of control object. */ 631 if (IS_CTL_VP(vp)) { 632 MARK_INT_FAIL(CODA_SETATTR_STATS); 633 return(ENOENT); 634 } 635 636 if (codadebug & CODADBGMSK(CODA_SETATTR)) { 637 print_vattr(vap); 638 } 639 error = venus_setattr(vtomi(vp), &cp->c_fid, vap, cred, curlwp); 640 641 if (!error) 642 cp->c_flags &= ~C_VATTR; 643 644 CODADEBUG(CODA_SETATTR, myprintf(("setattr %d\n", error)); ) 645 return(error); 646 } 647 648 int 649 coda_access(void *v) 650 { 651 /* true args */ 652 struct vop_access_args *ap = v; 653 struct vnode *vp = ap->a_vp; 654 struct cnode *cp = VTOC(vp); 655 int mode = ap->a_mode; 656 kauth_cred_t cred = ap->a_cred; 657 /* locals */ 658 int error; 659 660 MARK_ENTRY(CODA_ACCESS_STATS); 661 662 /* Check for access of control object. Only read access is 663 allowed on it. */ 664 if (IS_CTL_VP(vp)) { 665 /* bogus hack - all will be marked as successes */ 666 MARK_INT_SAT(CODA_ACCESS_STATS); 667 return(((mode & VREAD) && !(mode & (VWRITE | VEXEC))) 668 ? 0 : EACCES); 669 } 670 671 /* 672 * if the file is a directory, and we are checking exec (eg lookup) 673 * access, and the file is in the namecache, then the user must have 674 * lookup access to it. 675 */ 676 if (coda_access_cache) { 677 if ((vp->v_type == VDIR) && (mode & VEXEC)) { 678 if (coda_nc_lookup(cp, ".", 1, cred)) { 679 MARK_INT_SAT(CODA_ACCESS_STATS); 680 return(0); /* it was in the cache */ 681 } 682 } 683 } 684 685 error = venus_access(vtomi(vp), &cp->c_fid, mode, cred, curlwp); 686 687 return(error); 688 } 689 690 /* 691 * CODA abort op, called after namei() when a CREATE/DELETE isn't actually 692 * done. If a buffer has been saved in anticipation of a coda_create or 693 * a coda_remove, delete it. 694 */ 695 /* ARGSUSED */ 696 int 697 coda_abortop(void *v) 698 { 699 /* true args */ 700 struct vop_abortop_args /* { 701 struct vnode *a_dvp; 702 struct componentname *a_cnp; 703 } */ *ap = v; 704 705 (void)ap; 706 /* upcall decl */ 707 /* locals */ 708 709 return (0); 710 } 711 712 int 713 coda_readlink(void *v) 714 { 715 /* true args */ 716 struct vop_readlink_args *ap = v; 717 struct vnode *vp = ap->a_vp; 718 struct cnode *cp = VTOC(vp); 719 struct uio *uiop = ap->a_uio; 720 kauth_cred_t cred = ap->a_cred; 721 /* locals */ 722 struct lwp *l = curlwp; 723 int error; 724 char *str; 725 int len; 726 727 MARK_ENTRY(CODA_READLINK_STATS); 728 729 /* Check for readlink of control object. */ 730 if (IS_CTL_VP(vp)) { 731 MARK_INT_FAIL(CODA_READLINK_STATS); 732 return(ENOENT); 733 } 734 735 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { /* symlink was cached */ 736 uiop->uio_rw = UIO_READ; 737 error = uiomove(cp->c_symlink, (int)cp->c_symlen, uiop); 738 if (error) 739 MARK_INT_FAIL(CODA_READLINK_STATS); 740 else 741 MARK_INT_SAT(CODA_READLINK_STATS); 742 return(error); 743 } 744 745 error = venus_readlink(vtomi(vp), &cp->c_fid, cred, l, &str, &len); 746 747 if (!error) { 748 uiop->uio_rw = UIO_READ; 749 error = uiomove(str, len, uiop); 750 751 if (coda_symlink_cache) { 752 cp->c_symlink = str; 753 cp->c_symlen = len; 754 cp->c_flags |= C_SYMLINK; 755 } else 756 CODA_FREE(str, len); 757 } 758 759 CODADEBUG(CODA_READLINK, myprintf(("in readlink result %d\n",error));) 760 return(error); 761 } 762 763 int 764 coda_fsync(void *v) 765 { 766 /* true args */ 767 struct vop_fsync_args *ap = v; 768 struct vnode *vp = ap->a_vp; 769 struct cnode *cp = VTOC(vp); 770 kauth_cred_t cred = ap->a_cred; 771 /* locals */ 772 struct vnode *convp = cp->c_ovp; 773 int error; 774 775 MARK_ENTRY(CODA_FSYNC_STATS); 776 777 /* Check for fsync on an unmounting object */ 778 /* The NetBSD kernel, in it's infinite wisdom, can try to fsync 779 * after an unmount has been initiated. This is a Bad Thing, 780 * which we have to avoid. Not a legitimate failure for stats. 781 */ 782 if (IS_UNMOUNTING(cp)) { 783 return(ENODEV); 784 } 785 786 /* Check for fsync of control object. */ 787 if (IS_CTL_VP(vp)) { 788 MARK_INT_SAT(CODA_FSYNC_STATS); 789 return(0); 790 } 791 792 if (convp) 793 VOP_FSYNC(convp, cred, MNT_WAIT, 0, 0); 794 795 /* 796 * We can expect fsync on any vnode at all if venus is pruging it. 797 * Venus can't very well answer the fsync request, now can it? 798 * Hopefully, it won't have to, because hopefully, venus preserves 799 * the (possibly untrue) invariant that it never purges an open 800 * vnode. Hopefully. 801 */ 802 if (cp->c_flags & C_PURGING) { 803 return(0); 804 } 805 806 error = venus_fsync(vtomi(vp), &cp->c_fid, cred, curlwp); 807 808 CODADEBUG(CODA_FSYNC, myprintf(("in fsync result %d\n",error)); ); 809 return(error); 810 } 811 812 /* 813 * vp is locked on entry, and we must unlock it. 814 * XXX This routine is suspect and probably needs rewriting. 815 */ 816 int 817 coda_inactive(void *v) 818 { 819 /* true args */ 820 struct vop_inactive_args *ap = v; 821 struct vnode *vp = ap->a_vp; 822 struct cnode *cp = VTOC(vp); 823 kauth_cred_t cred __unused = NULL; 824 825 /* We don't need to send inactive to venus - DCS */ 826 MARK_ENTRY(CODA_INACTIVE_STATS); 827 828 if (IS_CTL_VP(vp)) { 829 MARK_INT_SAT(CODA_INACTIVE_STATS); 830 return 0; 831 } 832 833 CODADEBUG(CODA_INACTIVE, myprintf(("in inactive, %s, vfsp %p\n", 834 coda_f2s(&cp->c_fid), vp->v_mount));) 835 836 /* If an array has been allocated to hold the symlink, deallocate it */ 837 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { 838 if (cp->c_symlink == NULL) 839 panic("coda_inactive: null symlink pointer in cnode"); 840 841 CODA_FREE(cp->c_symlink, cp->c_symlen); 842 cp->c_flags &= ~C_SYMLINK; 843 cp->c_symlen = 0; 844 } 845 846 /* Remove it from the table so it can't be found. */ 847 coda_unsave(cp); 848 if (vp->v_mount->mnt_data == NULL) { 849 myprintf(("Help! vfsp->vfs_data was NULL, but vnode %p wasn't dying\n", vp)); 850 panic("badness in coda_inactive"); 851 } 852 853 if (IS_UNMOUNTING(cp)) { 854 /* XXX Do we need to VOP_CLOSE container vnodes? */ 855 if (vp->v_usecount > 1) 856 printf("coda_inactive: IS_UNMOUNTING %p usecount %d\n", 857 vp, vp->v_usecount); 858 if (cp->c_ovp != NULL) 859 printf("coda_inactive: %p ovp != NULL\n", vp); 860 VOP_UNLOCK(vp); 861 } else { 862 /* Sanity checks that perhaps should be panic. */ 863 if (vp->v_usecount > 1) { 864 printf("coda_inactive: %p usecount %d\n", vp, vp->v_usecount); 865 } 866 if (cp->c_ovp != NULL) { 867 printf("coda_inactive: %p ovp != NULL\n", vp); 868 } 869 VOP_UNLOCK(vp); 870 *ap->a_recycle = true; 871 } 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 struct vnode *dvp = ap->a_dvp; 888 struct cnode *dcp = VTOC(dvp); 889 /* output variable for result */ 890 struct vnode **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 int isdot; 901 CodaFid VFid; 902 int vtype; 903 int error = 0; 904 905 MARK_ENTRY(CODA_LOOKUP_STATS); 906 907 CODADEBUG(CODA_LOOKUP, myprintf(("lookup: %s in %s\n", 908 nm, coda_f2s(&dcp->c_fid)));); 909 910 /* 911 * XXX componentname flags in MODMASK are not handled at all 912 */ 913 914 /* 915 * The overall strategy is to switch on the lookup type and get a 916 * result vnode that is vref'd but not locked. Then, the code at 917 * exit: switches on ., .., and regular lookups and does the right 918 * locking. 919 */ 920 921 /* Check for lookup of control object. */ 922 if (IS_CTL_NAME(dvp, nm, len)) { 923 *vpp = coda_ctlvp; 924 vref(*vpp); 925 MARK_INT_SAT(CODA_LOOKUP_STATS); 926 goto exit; 927 } 928 929 /* Avoid trying to hand venus an unreasonably long name. */ 930 if (len+1 > CODA_MAXNAMLEN) { 931 MARK_INT_FAIL(CODA_LOOKUP_STATS); 932 CODADEBUG(CODA_LOOKUP, myprintf(("name too long: lookup, %s (%s)\n", 933 coda_f2s(&dcp->c_fid), nm));); 934 *vpp = (struct vnode *)0; 935 error = EINVAL; 936 goto exit; 937 } 938 939 /* 940 * XXX Check for DOT lookups, and short circuit all the caches, 941 * just doing an extra vref. (venus guarantees that lookup of 942 * . returns self.) 943 */ 944 isdot = (len == 1 && nm[0] == '.'); 945 946 /* 947 * Try to resolve the lookup in the minicache. If that fails, ask 948 * venus to do the lookup. XXX The interaction between vnode 949 * locking and any locking that coda does is not clear. 950 */ 951 cp = coda_nc_lookup(dcp, nm, len, cred); 952 if (cp) { 953 *vpp = CTOV(cp); 954 vref(*vpp); 955 CODADEBUG(CODA_LOOKUP, 956 myprintf(("lookup result %d vpp %p\n",error,*vpp));) 957 } else { 958 /* The name wasn't cached, so ask Venus. */ 959 error = venus_lookup(vtomi(dvp), &dcp->c_fid, nm, len, cred, l, &VFid, &vtype); 960 961 if (error) { 962 MARK_INT_FAIL(CODA_LOOKUP_STATS); 963 CODADEBUG(CODA_LOOKUP, myprintf(("lookup error on %s (%s)%d\n", 964 coda_f2s(&dcp->c_fid), nm, error));) 965 *vpp = (struct vnode *)0; 966 } else { 967 MARK_INT_SAT(CODA_LOOKUP_STATS); 968 CODADEBUG(CODA_LOOKUP, 969 myprintf(("lookup: %s type %o result %d\n", 970 coda_f2s(&VFid), vtype, error)); ) 971 972 cp = make_coda_node(&VFid, dvp->v_mount, vtype); 973 *vpp = CTOV(cp); 974 /* vpp is now vrefed. */ 975 976 /* 977 * Unless this vnode is marked CODA_NOCACHE, enter it into 978 * the coda name cache to avoid a future venus round-trip. 979 * XXX Interaction with componentname NOCACHE is unclear. 980 */ 981 if (!(vtype & CODA_NOCACHE)) 982 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 983 } 984 } 985 986 exit: 987 /* 988 * If we are creating, and this was the last name to be looked up, 989 * and the error was ENOENT, then make the leaf NULL and return 990 * success. 991 * XXX Check against new lookup rules. 992 */ 993 if (((cnp->cn_nameiop == CREATE) || (cnp->cn_nameiop == RENAME)) 994 && (cnp->cn_flags & ISLASTCN) 995 && (error == ENOENT)) 996 { 997 error = EJUSTRETURN; 998 *ap->a_vpp = NULL; 999 } 1000 1001 /* 1002 * If the lookup succeeded, we must generally lock the returned 1003 * vnode. This could be a ., .., or normal lookup. See 1004 * vnodeops(9) for the details. 1005 */ 1006 /* 1007 * XXX LK_RETRY is likely incorrect. Handle vn_lock failure 1008 * somehow, and remove LK_RETRY. 1009 */ 1010 if (!error || (error == EJUSTRETURN)) { 1011 /* Lookup has a value and it isn't "."? */ 1012 if (*ap->a_vpp && (*ap->a_vpp != dvp)) { 1013 if (flags & ISDOTDOT) 1014 /* ..: unlock parent */ 1015 VOP_UNLOCK(dvp); 1016 /* all but .: lock child */ 1017 vn_lock(*ap->a_vpp, LK_EXCLUSIVE | LK_RETRY); 1018 if (flags & ISDOTDOT) 1019 /* ..: relock parent */ 1020 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1021 } 1022 /* else .: leave dvp locked */ 1023 } else { 1024 /* The lookup failed, so return NULL. Leave dvp locked. */ 1025 *ap->a_vpp = NULL; 1026 } 1027 return(error); 1028 } 1029 1030 /*ARGSUSED*/ 1031 int 1032 coda_create(void *v) 1033 { 1034 /* true args */ 1035 struct vop_create_args *ap = v; 1036 struct vnode *dvp = ap->a_dvp; 1037 struct cnode *dcp = VTOC(dvp); 1038 struct vattr *va = ap->a_vap; 1039 int exclusive = 1; 1040 int mode = ap->a_vap->va_mode; 1041 struct vnode **vpp = ap->a_vpp; 1042 struct componentname *cnp = ap->a_cnp; 1043 kauth_cred_t cred = cnp->cn_cred; 1044 struct lwp *l = curlwp; 1045 /* locals */ 1046 int error; 1047 struct cnode *cp; 1048 const char *nm = cnp->cn_nameptr; 1049 int len = cnp->cn_namelen; 1050 CodaFid VFid; 1051 struct vattr attr; 1052 1053 MARK_ENTRY(CODA_CREATE_STATS); 1054 1055 /* All creates are exclusive XXX */ 1056 /* I'm assuming the 'mode' argument is the file mode bits XXX */ 1057 1058 /* Check for create of control object. */ 1059 if (IS_CTL_NAME(dvp, nm, len)) { 1060 *vpp = (struct vnode *)0; 1061 MARK_INT_FAIL(CODA_CREATE_STATS); 1062 return(EACCES); 1063 } 1064 1065 error = venus_create(vtomi(dvp), &dcp->c_fid, nm, len, exclusive, mode, va, cred, l, &VFid, &attr); 1066 1067 if (!error) { 1068 1069 /* 1070 * XXX Violation of venus/kernel invariants is a difficult case, 1071 * but venus should not be able to cause a panic. 1072 */ 1073 /* If this is an exclusive create, panic if the file already exists. */ 1074 /* Venus should have detected the file and reported EEXIST. */ 1075 1076 if ((exclusive == 1) && 1077 (coda_find(&VFid) != NULL)) 1078 panic("cnode existed for newly created file!"); 1079 1080 cp = make_coda_node(&VFid, dvp->v_mount, attr.va_type); 1081 *vpp = CTOV(cp); 1082 1083 /* XXX vnodeops doesn't say this argument can be changed. */ 1084 /* Update va to reflect the new attributes. */ 1085 (*va) = attr; 1086 1087 /* Update the attribute cache and mark it as valid */ 1088 if (coda_attr_cache) { 1089 VTOC(*vpp)->c_vattr = attr; 1090 VTOC(*vpp)->c_flags |= C_VATTR; 1091 } 1092 1093 /* Invalidate parent's attr cache (modification time has changed). */ 1094 VTOC(dvp)->c_flags &= ~C_VATTR; 1095 1096 /* enter the new vnode in the Name Cache */ 1097 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1098 1099 CODADEBUG(CODA_CREATE, 1100 myprintf(("create: %s, result %d\n", 1101 coda_f2s(&VFid), error)); ) 1102 } else { 1103 *vpp = (struct vnode *)0; 1104 CODADEBUG(CODA_CREATE, myprintf(("create error %d\n", error));) 1105 } 1106 1107 /* 1108 * vnodeops(9) says that we must unlock the parent and lock the child. 1109 * XXX Should we lock the child first? 1110 */ 1111 vput(dvp); 1112 if (!error) { 1113 if ((cnp->cn_flags & LOCKLEAF) == 0) { 1114 /* This should not happen; flags are for lookup only. */ 1115 printf("coda_create: LOCKLEAF not set!\n"); 1116 } 1117 1118 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { 1119 /* XXX Perhaps avoid this panic. */ 1120 panic("coda_create: couldn't lock child"); 1121 } 1122 } 1123 1124 return(error); 1125 } 1126 1127 int 1128 coda_remove(void *v) 1129 { 1130 /* true args */ 1131 struct vop_remove_args *ap = v; 1132 struct vnode *dvp = ap->a_dvp; 1133 struct cnode *cp = VTOC(dvp); 1134 struct vnode *vp = ap->a_vp; 1135 struct componentname *cnp = ap->a_cnp; 1136 kauth_cred_t cred = cnp->cn_cred; 1137 struct lwp *l = curlwp; 1138 /* locals */ 1139 int error; 1140 const char *nm = cnp->cn_nameptr; 1141 int len = cnp->cn_namelen; 1142 struct cnode *tp; 1143 1144 MARK_ENTRY(CODA_REMOVE_STATS); 1145 1146 CODADEBUG(CODA_REMOVE, myprintf(("remove: %s in %s\n", 1147 nm, coda_f2s(&cp->c_fid)));); 1148 1149 /* Remove the file's entry from the CODA Name Cache */ 1150 /* We're being conservative here, it might be that this person 1151 * doesn't really have sufficient access to delete the file 1152 * but we feel zapping the entry won't really hurt anyone -- dcs 1153 */ 1154 /* I'm gonna go out on a limb here. If a file and a hardlink to it 1155 * exist, and one is removed, the link count on the other will be 1156 * off by 1. We could either invalidate the attrs if cached, or 1157 * fix them. I'll try to fix them. DCS 11/8/94 1158 */ 1159 tp = coda_nc_lookup(VTOC(dvp), nm, len, cred); 1160 if (tp) { 1161 if (VALID_VATTR(tp)) { /* If attrs are cached */ 1162 if (tp->c_vattr.va_nlink > 1) { /* If it's a hard link */ 1163 tp->c_vattr.va_nlink--; 1164 } 1165 } 1166 1167 coda_nc_zapfile(VTOC(dvp), nm, len); 1168 /* No need to flush it if it doesn't exist! */ 1169 } 1170 /* Invalidate the parent's attr cache, the modification time has changed */ 1171 VTOC(dvp)->c_flags &= ~C_VATTR; 1172 1173 /* Check for remove of control object. */ 1174 if (IS_CTL_NAME(dvp, nm, len)) { 1175 MARK_INT_FAIL(CODA_REMOVE_STATS); 1176 return(ENOENT); 1177 } 1178 1179 error = venus_remove(vtomi(dvp), &cp->c_fid, nm, len, cred, l); 1180 1181 CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n",error)); ) 1182 1183 /* 1184 * Unlock parent and child (avoiding double if "."). 1185 */ 1186 if (dvp == vp) { 1187 vrele(vp); 1188 } else { 1189 vput(vp); 1190 } 1191 vput(dvp); 1192 1193 return(error); 1194 } 1195 1196 /* 1197 * dvp is the directory where the link is to go, and is locked. 1198 * vp is the object to be linked to, and is unlocked. 1199 * At exit, we must unlock dvp, and vput dvp. 1200 */ 1201 int 1202 coda_link(void *v) 1203 { 1204 /* true args */ 1205 struct vop_link_args *ap = v; 1206 struct vnode *vp = ap->a_vp; 1207 struct cnode *cp = VTOC(vp); 1208 struct vnode *dvp = ap->a_dvp; 1209 struct cnode *dcp = VTOC(dvp); 1210 struct componentname *cnp = ap->a_cnp; 1211 kauth_cred_t cred = cnp->cn_cred; 1212 struct lwp *l = curlwp; 1213 /* locals */ 1214 int error; 1215 const char *nm = cnp->cn_nameptr; 1216 int len = cnp->cn_namelen; 1217 1218 MARK_ENTRY(CODA_LINK_STATS); 1219 1220 if (codadebug & CODADBGMSK(CODA_LINK)) { 1221 1222 myprintf(("nb_link: vp fid: %s\n", 1223 coda_f2s(&cp->c_fid))); 1224 myprintf(("nb_link: dvp fid: %s)\n", 1225 coda_f2s(&dcp->c_fid))); 1226 1227 } 1228 if (codadebug & CODADBGMSK(CODA_LINK)) { 1229 myprintf(("link: vp fid: %s\n", 1230 coda_f2s(&cp->c_fid))); 1231 myprintf(("link: dvp fid: %s\n", 1232 coda_f2s(&dcp->c_fid))); 1233 1234 } 1235 1236 /* Check for link to/from control object. */ 1237 if (IS_CTL_NAME(dvp, nm, len) || IS_CTL_VP(vp)) { 1238 MARK_INT_FAIL(CODA_LINK_STATS); 1239 return(EACCES); 1240 } 1241 1242 /* If linking . to a name, error out earlier. */ 1243 if (vp == dvp) { 1244 printf("coda_link vp==dvp\n"); 1245 error = EISDIR; 1246 goto exit; 1247 } 1248 1249 /* XXX Why does venus_link need the vnode to be locked?*/ 1250 if ((error = vn_lock(vp, LK_EXCLUSIVE)) != 0) { 1251 printf("coda_link: couldn't lock vnode %p\n", vp); 1252 error = EFAULT; /* XXX better value */ 1253 goto exit; 1254 } 1255 error = venus_link(vtomi(vp), &cp->c_fid, &dcp->c_fid, nm, len, cred, l); 1256 VOP_UNLOCK(vp); 1257 1258 /* Invalidate parent's attr cache (the modification time has changed). */ 1259 VTOC(dvp)->c_flags &= ~C_VATTR; 1260 /* Invalidate child's attr cache (XXX why). */ 1261 VTOC(vp)->c_flags &= ~C_VATTR; 1262 1263 CODADEBUG(CODA_LINK, myprintf(("in link result %d\n",error)); ) 1264 1265 exit: 1266 vput(dvp); 1267 return(error); 1268 } 1269 1270 int 1271 coda_rename(void *v) 1272 { 1273 /* true args */ 1274 struct vop_rename_args *ap = v; 1275 struct vnode *odvp = ap->a_fdvp; 1276 struct cnode *odcp = VTOC(odvp); 1277 struct componentname *fcnp = ap->a_fcnp; 1278 struct vnode *ndvp = ap->a_tdvp; 1279 struct cnode *ndcp = VTOC(ndvp); 1280 struct componentname *tcnp = ap->a_tcnp; 1281 kauth_cred_t cred = fcnp->cn_cred; 1282 struct lwp *l = curlwp; 1283 /* true args */ 1284 int error; 1285 const char *fnm = fcnp->cn_nameptr; 1286 int flen = fcnp->cn_namelen; 1287 const char *tnm = tcnp->cn_nameptr; 1288 int tlen = tcnp->cn_namelen; 1289 1290 MARK_ENTRY(CODA_RENAME_STATS); 1291 1292 /* Hmmm. The vnodes are already looked up. Perhaps they are locked? 1293 This could be Bad. XXX */ 1294 #ifdef OLD_DIAGNOSTIC 1295 if ((fcnp->cn_cred != tcnp->cn_cred) 1296 || (fcnp->cn_lwp != tcnp->cn_lwp)) 1297 { 1298 panic("coda_rename: component names don't agree"); 1299 } 1300 #endif 1301 1302 /* Check for rename involving control object. */ 1303 if (IS_CTL_NAME(odvp, fnm, flen) || IS_CTL_NAME(ndvp, tnm, tlen)) { 1304 MARK_INT_FAIL(CODA_RENAME_STATS); 1305 return(EACCES); 1306 } 1307 1308 /* Problem with moving directories -- need to flush entry for .. */ 1309 if (odvp != ndvp) { 1310 struct cnode *ovcp = coda_nc_lookup(VTOC(odvp), fnm, flen, cred); 1311 if (ovcp) { 1312 struct vnode *ovp = CTOV(ovcp); 1313 if ((ovp) && 1314 (ovp->v_type == VDIR)) /* If it's a directory */ 1315 coda_nc_zapfile(VTOC(ovp),"..", 2); 1316 } 1317 } 1318 1319 /* Remove the entries for both source and target files */ 1320 coda_nc_zapfile(VTOC(odvp), fnm, flen); 1321 coda_nc_zapfile(VTOC(ndvp), tnm, tlen); 1322 1323 /* Invalidate the parent's attr cache, the modification time has changed */ 1324 VTOC(odvp)->c_flags &= ~C_VATTR; 1325 VTOC(ndvp)->c_flags &= ~C_VATTR; 1326 1327 if (flen+1 > CODA_MAXNAMLEN) { 1328 MARK_INT_FAIL(CODA_RENAME_STATS); 1329 error = EINVAL; 1330 goto exit; 1331 } 1332 1333 if (tlen+1 > CODA_MAXNAMLEN) { 1334 MARK_INT_FAIL(CODA_RENAME_STATS); 1335 error = EINVAL; 1336 goto exit; 1337 } 1338 1339 error = venus_rename(vtomi(odvp), &odcp->c_fid, &ndcp->c_fid, fnm, flen, tnm, tlen, cred, l); 1340 1341 exit: 1342 CODADEBUG(CODA_RENAME, myprintf(("in rename result %d\n",error));) 1343 /* XXX - do we need to call cache pureg on the moved vnode? */ 1344 cache_purge(ap->a_fvp); 1345 1346 /* It seems to be incumbent on us to drop locks on all four vnodes */ 1347 /* From-vnodes are not locked, only ref'd. To-vnodes are locked. */ 1348 1349 vrele(ap->a_fvp); 1350 vrele(odvp); 1351 1352 if (ap->a_tvp) { 1353 if (ap->a_tvp == ndvp) { 1354 vrele(ap->a_tvp); 1355 } else { 1356 vput(ap->a_tvp); 1357 } 1358 } 1359 1360 vput(ndvp); 1361 return(error); 1362 } 1363 1364 int 1365 coda_mkdir(void *v) 1366 { 1367 /* true args */ 1368 struct vop_mkdir_args *ap = v; 1369 struct vnode *dvp = ap->a_dvp; 1370 struct cnode *dcp = VTOC(dvp); 1371 struct componentname *cnp = ap->a_cnp; 1372 struct vattr *va = ap->a_vap; 1373 struct vnode **vpp = ap->a_vpp; 1374 kauth_cred_t cred = cnp->cn_cred; 1375 struct lwp *l = curlwp; 1376 /* locals */ 1377 int error; 1378 const char *nm = cnp->cn_nameptr; 1379 int len = cnp->cn_namelen; 1380 struct cnode *cp; 1381 CodaFid VFid; 1382 struct vattr ova; 1383 1384 MARK_ENTRY(CODA_MKDIR_STATS); 1385 1386 /* Check for mkdir of target object. */ 1387 if (IS_CTL_NAME(dvp, nm, len)) { 1388 *vpp = (struct vnode *)0; 1389 MARK_INT_FAIL(CODA_MKDIR_STATS); 1390 return(EACCES); 1391 } 1392 1393 if (len+1 > CODA_MAXNAMLEN) { 1394 *vpp = (struct vnode *)0; 1395 MARK_INT_FAIL(CODA_MKDIR_STATS); 1396 return(EACCES); 1397 } 1398 1399 error = venus_mkdir(vtomi(dvp), &dcp->c_fid, nm, len, va, cred, l, &VFid, &ova); 1400 1401 if (!error) { 1402 if (coda_find(&VFid) != NULL) 1403 panic("cnode existed for newly created directory!"); 1404 1405 1406 cp = make_coda_node(&VFid, dvp->v_mount, va->va_type); 1407 *vpp = CTOV(cp); 1408 1409 /* enter the new vnode in the Name Cache */ 1410 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1411 1412 /* as a side effect, enter "." and ".." for the directory */ 1413 coda_nc_enter(VTOC(*vpp), ".", 1, cred, VTOC(*vpp)); 1414 coda_nc_enter(VTOC(*vpp), "..", 2, cred, VTOC(dvp)); 1415 1416 if (coda_attr_cache) { 1417 VTOC(*vpp)->c_vattr = ova; /* update the attr cache */ 1418 VTOC(*vpp)->c_flags |= C_VATTR; /* Valid attributes in cnode */ 1419 } 1420 1421 /* Invalidate the parent's attr cache, the modification time has changed */ 1422 VTOC(dvp)->c_flags &= ~C_VATTR; 1423 1424 CODADEBUG( CODA_MKDIR, myprintf(("mkdir: %s result %d\n", 1425 coda_f2s(&VFid), error)); ) 1426 } else { 1427 *vpp = (struct vnode *)0; 1428 CODADEBUG(CODA_MKDIR, myprintf(("mkdir error %d\n",error));) 1429 } 1430 1431 /* 1432 * Currently, all mkdirs explicitly vput their dvp's. 1433 * It also appears that we *must* lock the vpp, since 1434 * lockleaf isn't set, but someone down the road is going 1435 * to try to unlock the new directory. 1436 */ 1437 vput(dvp); 1438 if (!error) { 1439 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { 1440 panic("coda_mkdir: couldn't lock child"); 1441 } 1442 } 1443 1444 return(error); 1445 } 1446 1447 int 1448 coda_rmdir(void *v) 1449 { 1450 /* true args */ 1451 struct vop_rmdir_args *ap = v; 1452 struct vnode *dvp = ap->a_dvp; 1453 struct cnode *dcp = VTOC(dvp); 1454 struct vnode *vp = ap->a_vp; 1455 struct componentname *cnp = ap->a_cnp; 1456 kauth_cred_t cred = cnp->cn_cred; 1457 struct lwp *l = curlwp; 1458 /* true args */ 1459 int error; 1460 const char *nm = cnp->cn_nameptr; 1461 int len = cnp->cn_namelen; 1462 struct cnode *cp; 1463 1464 MARK_ENTRY(CODA_RMDIR_STATS); 1465 1466 /* Check for rmdir of control object. */ 1467 if (IS_CTL_NAME(dvp, nm, len)) { 1468 MARK_INT_FAIL(CODA_RMDIR_STATS); 1469 return(ENOENT); 1470 } 1471 1472 /* Can't remove . in self. */ 1473 if (dvp == vp) { 1474 printf("coda_rmdir: dvp == vp\n"); 1475 error = EINVAL; 1476 goto exit; 1477 } 1478 1479 /* 1480 * The caller may not have adequate permissions, and the venus 1481 * operation may fail, but it doesn't hurt from a correctness 1482 * viewpoint to invalidate cache entries. 1483 * XXX Why isn't this done after the venus_rmdir call? 1484 */ 1485 /* Look up child in name cache (by name, from parent). */ 1486 cp = coda_nc_lookup(dcp, nm, len, cred); 1487 /* If found, remove all children of the child (., ..). */ 1488 if (cp) coda_nc_zapParentfid(&(cp->c_fid), NOT_DOWNCALL); 1489 1490 /* Remove child's own entry. */ 1491 coda_nc_zapfile(dcp, nm, len); 1492 1493 /* Invalidate parent's attr cache (the modification time has changed). */ 1494 dcp->c_flags &= ~C_VATTR; 1495 1496 error = venus_rmdir(vtomi(dvp), &dcp->c_fid, nm, len, cred, l); 1497 1498 CODADEBUG(CODA_RMDIR, myprintf(("in rmdir result %d\n", error)); ) 1499 1500 exit: 1501 /* vput both vnodes */ 1502 vput(dvp); 1503 if (dvp == vp) { 1504 vrele(vp); 1505 } else { 1506 vput(vp); 1507 } 1508 1509 return(error); 1510 } 1511 1512 int 1513 coda_symlink(void *v) 1514 { 1515 /* true args */ 1516 struct vop_symlink_args *ap = v; 1517 struct vnode *dvp = ap->a_dvp; 1518 struct cnode *dcp = VTOC(dvp); 1519 /* a_vpp is used in place below */ 1520 struct componentname *cnp = ap->a_cnp; 1521 struct vattr *tva = ap->a_vap; 1522 char *path = ap->a_target; 1523 kauth_cred_t cred = cnp->cn_cred; 1524 struct lwp *l = curlwp; 1525 /* locals */ 1526 int error; 1527 u_long saved_cn_flags; 1528 const char *nm = cnp->cn_nameptr; 1529 int len = cnp->cn_namelen; 1530 int plen = strlen(path); 1531 1532 /* 1533 * Here's the strategy for the moment: perform the symlink, then 1534 * do a lookup to grab the resulting vnode. I know this requires 1535 * two communications with Venus for a new sybolic link, but 1536 * that's the way the ball bounces. I don't yet want to change 1537 * the way the Mach symlink works. When Mach support is 1538 * deprecated, we should change symlink so that the common case 1539 * returns the resultant vnode in a vpp argument. 1540 */ 1541 1542 MARK_ENTRY(CODA_SYMLINK_STATS); 1543 1544 /* Check for symlink of control object. */ 1545 if (IS_CTL_NAME(dvp, nm, len)) { 1546 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1547 error = EACCES; 1548 goto exit; 1549 } 1550 1551 if (plen+1 > CODA_MAXPATHLEN) { 1552 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1553 error = EINVAL; 1554 goto exit; 1555 } 1556 1557 if (len+1 > CODA_MAXNAMLEN) { 1558 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1559 error = EINVAL; 1560 goto exit; 1561 } 1562 1563 error = venus_symlink(vtomi(dvp), &dcp->c_fid, path, plen, nm, len, tva, cred, l); 1564 1565 /* Invalidate the parent's attr cache (modification time has changed). */ 1566 dcp->c_flags &= ~C_VATTR; 1567 1568 if (!error) { 1569 /* 1570 * VOP_SYMLINK is not defined to pay attention to cnp->cn_flags; 1571 * these are defined only for VOP_LOOKUP. We desire to reuse 1572 * cnp for a VOP_LOOKUP operation, and must be sure to not pass 1573 * stray flags passed to us. Such stray flags can occur because 1574 * sys_symlink makes a namei call and then reuses the 1575 * componentname structure. 1576 */ 1577 /* 1578 * XXX Arguably we should create our own componentname structure 1579 * and not reuse the one that was passed in. 1580 */ 1581 saved_cn_flags = cnp->cn_flags; 1582 cnp->cn_flags &= ~(MODMASK | OPMASK); 1583 cnp->cn_flags |= LOOKUP; 1584 error = VOP_LOOKUP(dvp, ap->a_vpp, cnp); 1585 cnp->cn_flags = saved_cn_flags; 1586 /* Either an error occurs, or ap->a_vpp is locked. */ 1587 } 1588 1589 exit: 1590 /* unlock and deference parent */ 1591 vput(dvp); 1592 1593 CODADEBUG(CODA_SYMLINK, myprintf(("in symlink result %d\n",error)); ) 1594 return(error); 1595 } 1596 1597 /* 1598 * Read directory entries. 1599 */ 1600 int 1601 coda_readdir(void *v) 1602 { 1603 /* true args */ 1604 struct vop_readdir_args *ap = v; 1605 struct vnode *vp = ap->a_vp; 1606 struct cnode *cp = VTOC(vp); 1607 struct uio *uiop = ap->a_uio; 1608 kauth_cred_t cred = ap->a_cred; 1609 int *eofflag = ap->a_eofflag; 1610 off_t **cookies = ap->a_cookies; 1611 int *ncookies = ap->a_ncookies; 1612 /* upcall decl */ 1613 /* locals */ 1614 int error = 0; 1615 1616 MARK_ENTRY(CODA_READDIR_STATS); 1617 1618 CODADEBUG(CODA_READDIR, myprintf(("coda_readdir(%p, %lu, %lld)\n", uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, (long long) uiop->uio_offset)); ) 1619 1620 /* Check for readdir of control object. */ 1621 if (IS_CTL_VP(vp)) { 1622 MARK_INT_FAIL(CODA_READDIR_STATS); 1623 return(ENOENT); 1624 } 1625 1626 { 1627 /* Redirect the request to UFS. */ 1628 1629 /* If directory is not already open do an "internal open" on it. */ 1630 int opened_internally = 0; 1631 if (cp->c_ovp == NULL) { 1632 opened_internally = 1; 1633 MARK_INT_GEN(CODA_OPEN_STATS); 1634 error = VOP_OPEN(vp, FREAD, cred); 1635 #ifdef CODA_VERBOSE 1636 printf("coda_readdir: Internally Opening %p\n", vp); 1637 #endif 1638 if (error) return(error); 1639 } else 1640 vp = cp->c_ovp; 1641 1642 /* Have UFS handle the call. */ 1643 CODADEBUG(CODA_READDIR, myprintf(( 1644 "indirect readdir: fid = %s, refcnt = %d\n", 1645 coda_f2s(&cp->c_fid), vp->v_usecount)); ) 1646 error = VOP_READDIR(vp, uiop, cred, eofflag, cookies, ncookies); 1647 if (error) 1648 MARK_INT_FAIL(CODA_READDIR_STATS); 1649 else 1650 MARK_INT_SAT(CODA_READDIR_STATS); 1651 1652 /* Do an "internal close" if necessary. */ 1653 if (opened_internally) { 1654 MARK_INT_GEN(CODA_CLOSE_STATS); 1655 (void)VOP_CLOSE(vp, FREAD, cred); 1656 } 1657 } 1658 1659 return(error); 1660 } 1661 1662 /* 1663 * Convert from file system blocks to device blocks 1664 */ 1665 int 1666 coda_bmap(void *v) 1667 { 1668 /* XXX on the global proc */ 1669 /* true args */ 1670 struct vop_bmap_args *ap = v; 1671 struct vnode *vp __unused = ap->a_vp; /* file's vnode */ 1672 daddr_t bn __unused = ap->a_bn; /* fs block number */ 1673 struct vnode **vpp = ap->a_vpp; /* RETURN vp of device */ 1674 daddr_t *bnp __unused = ap->a_bnp; /* RETURN device block number */ 1675 struct lwp *l __unused = curlwp; 1676 /* upcall decl */ 1677 /* locals */ 1678 1679 *vpp = (struct vnode *)0; 1680 myprintf(("coda_bmap called!\n")); 1681 return(EINVAL); 1682 } 1683 1684 /* 1685 * I don't think the following two things are used anywhere, so I've 1686 * commented them out 1687 * 1688 * struct buf *async_bufhead; 1689 * int async_daemon_count; 1690 */ 1691 int 1692 coda_strategy(void *v) 1693 { 1694 /* true args */ 1695 struct vop_strategy_args *ap = v; 1696 struct buf *bp __unused = ap->a_bp; 1697 struct lwp *l __unused = curlwp; 1698 /* upcall decl */ 1699 /* locals */ 1700 1701 myprintf(("coda_strategy called! ")); 1702 return(EINVAL); 1703 } 1704 1705 int 1706 coda_reclaim(void *v) 1707 { 1708 /* true args */ 1709 struct vop_reclaim_args *ap = v; 1710 struct vnode *vp = ap->a_vp; 1711 struct cnode *cp = VTOC(vp); 1712 /* upcall decl */ 1713 /* locals */ 1714 1715 /* 1716 * Forced unmount/flush will let vnodes with non zero use be destroyed! 1717 */ 1718 ENTRY; 1719 1720 if (IS_UNMOUNTING(cp)) { 1721 #ifdef DEBUG 1722 if (VTOC(vp)->c_ovp) { 1723 if (IS_UNMOUNTING(cp)) 1724 printf("coda_reclaim: c_ovp not void: vp %p, cp %p\n", vp, cp); 1725 } 1726 #endif 1727 } else { 1728 #ifdef OLD_DIAGNOSTIC 1729 if (vp->v_usecount != 0) 1730 print("coda_reclaim: pushing active %p\n", vp); 1731 if (VTOC(vp)->c_ovp) { 1732 panic("coda_reclaim: c_ovp not void"); 1733 } 1734 #endif 1735 } 1736 coda_free(VTOC(vp)); 1737 SET_VTOC(vp) = NULL; 1738 return (0); 1739 } 1740 1741 int 1742 coda_lock(void *v) 1743 { 1744 /* true args */ 1745 struct vop_lock_args *ap = v; 1746 struct vnode *vp = ap->a_vp; 1747 struct cnode *cp = VTOC(vp); 1748 /* upcall decl */ 1749 /* locals */ 1750 1751 ENTRY; 1752 1753 if (coda_lockdebug) { 1754 myprintf(("Attempting lock on %s\n", 1755 coda_f2s(&cp->c_fid))); 1756 } 1757 1758 return genfs_lock(v); 1759 } 1760 1761 int 1762 coda_unlock(void *v) 1763 { 1764 /* true args */ 1765 struct vop_unlock_args *ap = v; 1766 struct vnode *vp = ap->a_vp; 1767 struct cnode *cp = VTOC(vp); 1768 /* upcall decl */ 1769 /* locals */ 1770 1771 ENTRY; 1772 if (coda_lockdebug) { 1773 myprintf(("Attempting unlock on %s\n", 1774 coda_f2s(&cp->c_fid))); 1775 } 1776 1777 return genfs_unlock(v); 1778 } 1779 1780 int 1781 coda_islocked(void *v) 1782 { 1783 /* true args */ 1784 ENTRY; 1785 1786 return genfs_islocked(v); 1787 } 1788 1789 /* 1790 * Given a device and inode, obtain a locked vnode. One reference is 1791 * obtained and passed back to the caller. 1792 */ 1793 int 1794 coda_grab_vnode(struct vnode *uvp, dev_t dev, ino_t ino, struct vnode **vpp) 1795 { 1796 int error; 1797 struct mount *mp; 1798 1799 /* Obtain mount point structure from device. */ 1800 if (!(mp = devtomp(dev))) { 1801 myprintf(("coda_grab_vnode: devtomp(0x%llx) returns NULL\n", 1802 (unsigned long long)dev)); 1803 return(ENXIO); 1804 } 1805 1806 /* 1807 * Obtain vnode from mount point and inode. 1808 * XXX VFS_VGET does not clearly define locked/referenced state of 1809 * returned vnode. 1810 */ 1811 error = VFS_VGET(mp, ino, vpp); 1812 if (error) { 1813 myprintf(("coda_grab_vnode: iget/vget(0x%llx, %llu) returns %p, err %d\n", 1814 (unsigned long long)dev, (unsigned long long)ino, *vpp, error)); 1815 return(ENOENT); 1816 } 1817 /* share the lock with the underlying vnode */ 1818 mutex_obj_hold(uvp->v_interlock); 1819 uvm_obj_setlock(&(*vpp)->v_uobj, uvp->v_interlock); 1820 1821 return(0); 1822 } 1823 1824 void 1825 print_vattr(struct vattr *attr) 1826 { 1827 const char *typestr; 1828 1829 switch (attr->va_type) { 1830 case VNON: 1831 typestr = "VNON"; 1832 break; 1833 case VREG: 1834 typestr = "VREG"; 1835 break; 1836 case VDIR: 1837 typestr = "VDIR"; 1838 break; 1839 case VBLK: 1840 typestr = "VBLK"; 1841 break; 1842 case VCHR: 1843 typestr = "VCHR"; 1844 break; 1845 case VLNK: 1846 typestr = "VLNK"; 1847 break; 1848 case VSOCK: 1849 typestr = "VSCK"; 1850 break; 1851 case VFIFO: 1852 typestr = "VFFO"; 1853 break; 1854 case VBAD: 1855 typestr = "VBAD"; 1856 break; 1857 default: 1858 typestr = "????"; 1859 break; 1860 } 1861 1862 1863 myprintf(("attr: type %s mode %d uid %d gid %d fsid %d rdev %d\n", 1864 typestr, (int)attr->va_mode, (int)attr->va_uid, 1865 (int)attr->va_gid, (int)attr->va_fsid, (int)attr->va_rdev)); 1866 1867 myprintf((" fileid %d nlink %d size %d blocksize %d bytes %d\n", 1868 (int)attr->va_fileid, (int)attr->va_nlink, 1869 (int)attr->va_size, 1870 (int)attr->va_blocksize,(int)attr->va_bytes)); 1871 myprintf((" gen %ld flags %ld vaflags %d\n", 1872 attr->va_gen, attr->va_flags, attr->va_vaflags)); 1873 myprintf((" atime sec %d nsec %d\n", 1874 (int)attr->va_atime.tv_sec, (int)attr->va_atime.tv_nsec)); 1875 myprintf((" mtime sec %d nsec %d\n", 1876 (int)attr->va_mtime.tv_sec, (int)attr->va_mtime.tv_nsec)); 1877 myprintf((" ctime sec %d nsec %d\n", 1878 (int)attr->va_ctime.tv_sec, (int)attr->va_ctime.tv_nsec)); 1879 } 1880 1881 /* How to print a ucred */ 1882 void 1883 print_cred(kauth_cred_t cred) 1884 { 1885 1886 uint16_t ngroups; 1887 int i; 1888 1889 myprintf(("ref %d\tuid %d\n", kauth_cred_getrefcnt(cred), 1890 kauth_cred_geteuid(cred))); 1891 1892 ngroups = kauth_cred_ngroups(cred); 1893 for (i=0; i < ngroups; i++) 1894 myprintf(("\tgroup %d: (%d)\n", i, kauth_cred_group(cred, i))); 1895 myprintf(("\n")); 1896 1897 } 1898 1899 /* 1900 * Return a vnode for the given fid. 1901 * If no cnode exists for this fid create one and put it 1902 * in a table hashed by coda_f2i(). If the cnode for 1903 * this fid is already in the table return it (ref count is 1904 * incremented by coda_find. The cnode will be flushed from the 1905 * table when coda_inactive calls coda_unsave. 1906 */ 1907 struct cnode * 1908 make_coda_node(CodaFid *fid, struct mount *vfsp, short type) 1909 { 1910 struct cnode *cp; 1911 int err; 1912 1913 if ((cp = coda_find(fid)) == NULL) { 1914 struct vnode *vp; 1915 1916 cp = coda_alloc(); 1917 cp->c_fid = *fid; 1918 1919 err = getnewvnode(VT_CODA, vfsp, coda_vnodeop_p, NULL, &vp); 1920 if (err) { 1921 panic("coda: getnewvnode returned error %d", err); 1922 } 1923 vp->v_data = cp; 1924 vp->v_type = type; 1925 cp->c_vnode = vp; 1926 uvm_vnp_setsize(vp, 0); 1927 coda_save(cp); 1928 1929 } else { 1930 vref(CTOV(cp)); 1931 } 1932 1933 return cp; 1934 } 1935 1936 /* 1937 * coda_getpages may be called on a vnode which has not been opened, 1938 * e.g. to fault in pages to execute a program. In that case, we must 1939 * open the file to get the container. The vnode may or may not be 1940 * locked, and we must leave it in the same state. 1941 */ 1942 int 1943 coda_getpages(void *v) 1944 { 1945 struct vop_getpages_args /* { 1946 struct vnode *a_vp; 1947 voff_t a_offset; 1948 struct vm_page **a_m; 1949 int *a_count; 1950 int a_centeridx; 1951 vm_prot_t a_access_type; 1952 int a_advice; 1953 int a_flags; 1954 } */ *ap = v; 1955 struct vnode *vp = ap->a_vp, *cvp; 1956 struct cnode *cp = VTOC(vp); 1957 struct lwp *l = curlwp; 1958 kauth_cred_t cred = l->l_cred; 1959 int error, cerror; 1960 int waslocked; /* 1 if vnode lock was held on entry */ 1961 int didopen = 0; /* 1 if we opened container file */ 1962 1963 KASSERT(mutex_owned(vp->v_interlock)); 1964 1965 /* 1966 * Handle a case that uvm_fault doesn't quite use yet. 1967 * See layer_vnops.c. for inspiration. 1968 */ 1969 if (ap->a_flags & PGO_LOCKED) { 1970 return EBUSY; 1971 } 1972 1973 /* Check for control object. */ 1974 if (IS_CTL_VP(vp)) { 1975 printf("coda_getpages: control object %p\n", vp); 1976 return(EINVAL); 1977 } 1978 1979 /* 1980 * XXX It's really not ok to be releasing the lock we get, 1981 * because we could be overlapping with another call to 1982 * getpages and drop a lock they are relying on. We need to 1983 * figure out whether getpages ever is called holding the 1984 * lock, and if we should serialize getpages calls by some 1985 * mechanism. 1986 */ 1987 /* XXX VOP_ISLOCKED() may not be used for lock decisions. */ 1988 waslocked = VOP_ISLOCKED(vp); 1989 1990 /* Get container file if not already present. */ 1991 cvp = cp->c_ovp; 1992 if (cvp == NULL) { 1993 /* 1994 * VOP_OPEN requires a locked vnode. We must avoid 1995 * locking the vnode if it is already locked, and 1996 * leave it in the same state on exit. 1997 */ 1998 if (waslocked == 0) { 1999 cerror = vn_lock(vp, LK_EXCLUSIVE); 2000 if (cerror) { 2001 printf("coda_getpages: can't lock vnode %p\n", 2002 vp); 2003 return cerror; 2004 } 2005 #if 0 2006 printf("coda_getpages: locked vnode %p\n", vp); 2007 #endif 2008 } 2009 2010 /* 2011 * Open file (causes upcall to venus). 2012 * XXX Perhaps we should not fully open the file, but 2013 * simply obtain a container file. 2014 */ 2015 /* XXX Is it ok to do this while holding the simplelock? */ 2016 cerror = VOP_OPEN(vp, FREAD, cred); 2017 2018 if (cerror) { 2019 printf("coda_getpages: cannot open vnode %p => %d\n", 2020 vp, cerror); 2021 if (waslocked == 0) 2022 VOP_UNLOCK(vp); 2023 return cerror; 2024 } 2025 2026 #if 0 2027 printf("coda_getpages: opened vnode %p\n", vp); 2028 #endif 2029 cvp = cp->c_ovp; 2030 didopen = 1; 2031 } 2032 KASSERT(cvp != NULL); 2033 2034 /* Munge the arg structure to refer to the container vnode. */ 2035 KASSERT(cvp->v_interlock == vp->v_interlock); 2036 ap->a_vp = cp->c_ovp; 2037 2038 /* Finally, call getpages on it. */ 2039 error = VCALL(ap->a_vp, VOFFSET(vop_getpages), ap); 2040 2041 /* If we opened the vnode, we must close it. */ 2042 if (didopen) { 2043 /* 2044 * VOP_CLOSE requires a locked vnode, but we are still 2045 * holding the lock (or riding a caller's lock). 2046 */ 2047 cerror = VOP_CLOSE(vp, FREAD, cred); 2048 if (cerror != 0) 2049 /* XXX How should we handle this? */ 2050 printf("coda_getpages: closed vnode %p -> %d\n", 2051 vp, cerror); 2052 2053 /* If we obtained a lock, drop it. */ 2054 if (waslocked == 0) 2055 VOP_UNLOCK(vp); 2056 } 2057 2058 return error; 2059 } 2060 2061 /* 2062 * The protocol requires v_interlock to be held by the caller. 2063 */ 2064 int 2065 coda_putpages(void *v) 2066 { 2067 struct vop_putpages_args /* { 2068 struct vnode *a_vp; 2069 voff_t a_offlo; 2070 voff_t a_offhi; 2071 int a_flags; 2072 } */ *ap = v; 2073 struct vnode *vp = ap->a_vp, *cvp; 2074 struct cnode *cp = VTOC(vp); 2075 int error; 2076 2077 KASSERT(mutex_owned(vp->v_interlock)); 2078 2079 /* Check for control object. */ 2080 if (IS_CTL_VP(vp)) { 2081 mutex_exit(vp->v_interlock); 2082 printf("coda_putpages: control object %p\n", vp); 2083 return(EINVAL); 2084 } 2085 2086 /* 2087 * If container object is not present, then there are no pages 2088 * to put; just return without error. This happens all the 2089 * time, apparently during discard of a closed vnode (which 2090 * trivially can't have dirty pages). 2091 */ 2092 cvp = cp->c_ovp; 2093 if (cvp == NULL) { 2094 mutex_exit(vp->v_interlock); 2095 return 0; 2096 } 2097 2098 /* Munge the arg structure to refer to the container vnode. */ 2099 KASSERT(cvp->v_interlock == vp->v_interlock); 2100 ap->a_vp = cvp; 2101 2102 /* Finally, call putpages on it. */ 2103 error = VCALL(ap->a_vp, VOFFSET(vop_putpages), ap); 2104 2105 return error; 2106 } 2107
Indexes created Wed Oct 15 07:09:58 GMT 2025