coda_vnops.c revision 1.50.8.4
1 /* $NetBSD: coda_vnops.c,v 1.50.8.4 2010/08/04 11:00:06 bouyer 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 1.50.8.4 2010/08/04 11:00:06 bouyer 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/user.h> 64 #include <sys/vnode.h> 65 #include <sys/kauth.h> 66 67 #include <miscfs/genfs/genfs.h> 68 69 #include <coda/coda.h> 70 #include <coda/cnode.h> 71 #include <coda/coda_vnops.h> 72 #include <coda/coda_venus.h> 73 #include <coda/coda_opstats.h> 74 #include <coda/coda_subr.h> 75 #include <coda/coda_namecache.h> 76 #include <coda/coda_pioctl.h> 77 78 /* 79 * These flags select various performance enhancements. 80 */ 81 int coda_attr_cache = 1; /* Set to cache attributes in the kernel */ 82 int coda_symlink_cache = 1; /* Set to cache symbolic link information */ 83 int coda_access_cache = 1; /* Set to handle some access checks directly */ 84 85 /* structure to keep track of vfs calls */ 86 87 struct coda_op_stats coda_vnodeopstats[CODA_VNODEOPS_SIZE]; 88 89 #define MARK_ENTRY(op) (coda_vnodeopstats[op].entries++) 90 #define MARK_INT_SAT(op) (coda_vnodeopstats[op].sat_intrn++) 91 #define MARK_INT_FAIL(op) (coda_vnodeopstats[op].unsat_intrn++) 92 #define MARK_INT_GEN(op) (coda_vnodeopstats[op].gen_intrn++) 93 94 /* What we are delaying for in printf */ 95 int coda_printf_delay = 0; /* in microseconds */ 96 int coda_vnop_print_entry = 0; 97 static int coda_lockdebug = 0; 98 99 #define ENTRY if(coda_vnop_print_entry) myprintf(("Entered %s\n",__func__)) 100 101 /* Definition of the vnode operation vector */ 102 103 const struct vnodeopv_entry_desc coda_vnodeop_entries[] = { 104 { &vop_default_desc, coda_vop_error }, 105 { &vop_lookup_desc, coda_lookup }, /* lookup */ 106 { &vop_create_desc, coda_create }, /* create */ 107 { &vop_mknod_desc, coda_vop_error }, /* mknod */ 108 { &vop_open_desc, coda_open }, /* open */ 109 { &vop_close_desc, coda_close }, /* close */ 110 { &vop_access_desc, coda_access }, /* access */ 111 { &vop_getattr_desc, coda_getattr }, /* getattr */ 112 { &vop_setattr_desc, coda_setattr }, /* setattr */ 113 { &vop_read_desc, coda_read }, /* read */ 114 { &vop_write_desc, coda_write }, /* write */ 115 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 116 { &vop_ioctl_desc, coda_ioctl }, /* ioctl */ 117 { &vop_mmap_desc, genfs_mmap }, /* mmap */ 118 { &vop_fsync_desc, coda_fsync }, /* fsync */ 119 { &vop_remove_desc, coda_remove }, /* remove */ 120 { &vop_link_desc, coda_link }, /* link */ 121 { &vop_rename_desc, coda_rename }, /* rename */ 122 { &vop_mkdir_desc, coda_mkdir }, /* mkdir */ 123 { &vop_rmdir_desc, coda_rmdir }, /* rmdir */ 124 { &vop_symlink_desc, coda_symlink }, /* symlink */ 125 { &vop_readdir_desc, coda_readdir }, /* readdir */ 126 { &vop_readlink_desc, coda_readlink }, /* readlink */ 127 { &vop_abortop_desc, coda_abortop }, /* abortop */ 128 { &vop_inactive_desc, coda_inactive }, /* inactive */ 129 { &vop_reclaim_desc, coda_reclaim }, /* reclaim */ 130 { &vop_lock_desc, coda_lock }, /* lock */ 131 { &vop_unlock_desc, coda_unlock }, /* unlock */ 132 { &vop_bmap_desc, coda_bmap }, /* bmap */ 133 { &vop_strategy_desc, coda_strategy }, /* strategy */ 134 { &vop_print_desc, coda_vop_error }, /* print */ 135 { &vop_islocked_desc, coda_islocked }, /* islocked */ 136 { &vop_pathconf_desc, coda_vop_error }, /* pathconf */ 137 { &vop_advlock_desc, coda_vop_nop }, /* advlock */ 138 { &vop_bwrite_desc, coda_vop_error }, /* bwrite */ 139 { &vop_lease_desc, coda_vop_nop }, /* lease */ 140 { &vop_seek_desc, genfs_seek }, /* seek */ 141 { &vop_poll_desc, genfs_poll }, /* poll */ 142 { &vop_getpages_desc, coda_getpages }, /* getpages */ 143 { &vop_putpages_desc, coda_putpages }, /* putpages */ 144 { NULL, NULL } 145 }; 146 147 const struct vnodeopv_desc coda_vnodeop_opv_desc = 148 { &coda_vnodeop_p, coda_vnodeop_entries }; 149 150 /* Definitions of NetBSD vnodeop interfaces */ 151 152 /* 153 * A generic error routine. Return EIO without looking at arguments. 154 */ 155 int 156 coda_vop_error(void *anon) { 157 struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; 158 159 if (codadebug) { 160 myprintf(("coda_vop_error: Vnode operation %s called (error).\n", 161 (*desc)->vdesc_name)); 162 } 163 164 return EIO; 165 } 166 167 /* A generic do-nothing. For lease_check, advlock */ 168 int 169 coda_vop_nop(void *anon) { 170 struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; 171 172 if (codadebug) { 173 myprintf(("Vnode operation %s called, but unsupported\n", 174 (*desc)->vdesc_name)); 175 } 176 return (0); 177 } 178 179 int 180 coda_vnodeopstats_init(void) 181 { 182 int i; 183 184 for(i=0;i<CODA_VNODEOPS_SIZE;i++) { 185 coda_vnodeopstats[i].opcode = i; 186 coda_vnodeopstats[i].entries = 0; 187 coda_vnodeopstats[i].sat_intrn = 0; 188 coda_vnodeopstats[i].unsat_intrn = 0; 189 coda_vnodeopstats[i].gen_intrn = 0; 190 } 191 192 return 0; 193 } 194 195 /* 196 * XXX The entire relationship between VOP_OPEN and having a container 197 * file (via venus_open) needs to be reexamined. In particular, it's 198 * valid to open/mmap/close and then reference. Instead of doing 199 * VOP_OPEN when getpages needs a container, we should do the 200 * venus_open part, and record that the vnode has opened the container 201 * for getpages, and do the matching logical close on coda_inactive. 202 * Further, coda_rdwr needs a container file, and sometimes needs to 203 * do the equivalent of open (core dumps). 204 */ 205 /* 206 * coda_open calls Venus to return the device and inode of the 207 * container file, and then obtains a vnode for that file. The 208 * container vnode is stored in the coda vnode, and a reference is 209 * added for each open file. 210 */ 211 int 212 coda_open(void *v) 213 { 214 /* 215 * NetBSD can pass the O_EXCL flag in mode, even though the check 216 * has already happened. Venus defensively assumes that if open 217 * is passed the EXCL, it must be a bug. We strip the flag here. 218 */ 219 /* true args */ 220 struct vop_open_args *ap = v; 221 struct vnode *vp = ap->a_vp; 222 struct cnode *cp = VTOC(vp); 223 int flag = ap->a_mode & (~O_EXCL); 224 kauth_cred_t cred = ap->a_cred; 225 struct lwp *l = ap->a_l; 226 /* locals */ 227 int error; 228 dev_t dev; /* container file device, inode, vnode */ 229 ino_t inode; 230 struct vnode *container_vp; 231 232 MARK_ENTRY(CODA_OPEN_STATS); 233 234 /* Check for open of control file. */ 235 if (IS_CTL_VP(vp)) { 236 /* if (WRITABLE(flag)) */ 237 if (flag & (FWRITE | O_TRUNC | O_CREAT | O_EXCL)) { 238 MARK_INT_FAIL(CODA_OPEN_STATS); 239 return(EACCES); 240 } 241 MARK_INT_SAT(CODA_OPEN_STATS); 242 return(0); 243 } 244 245 error = venus_open(vtomi(vp), &cp->c_fid, flag, cred, l, &dev, &inode); 246 if (error) 247 return (error); 248 if (!error) { 249 CODADEBUG(CODA_OPEN, myprintf(("open: dev %d inode %llu result %d\n", 250 dev, (unsigned long long)inode, error)); ) 251 } 252 253 /* 254 * Obtain locked and referenced container vnode from container 255 * device/inode. 256 */ 257 error = coda_grab_vnode(dev, inode, &container_vp); 258 if (error) 259 return (error); 260 261 /* Save the vnode pointer for the container file. */ 262 if (cp->c_ovp == NULL) { 263 cp->c_ovp = container_vp; 264 } else { 265 if (cp->c_ovp != container_vp) 266 /* 267 * Perhaps venus returned a different container, or 268 * something else went wrong. 269 */ 270 panic("coda_open: cp->c_ovp != container_vp"); 271 } 272 cp->c_ocount++; 273 274 /* Flush the attribute cache if writing the file. */ 275 if (flag & FWRITE) { 276 cp->c_owrite++; 277 cp->c_flags &= ~C_VATTR; 278 } 279 280 /* 281 * Save the <device, inode> pair for the container file to speed 282 * up subsequent reads while closed (mmap, program execution). 283 * This is perhaps safe because venus will invalidate the node 284 * before changing the container file mapping. 285 */ 286 cp->c_device = dev; 287 cp->c_inode = inode; 288 289 /* Open the container file. */ 290 error = VOP_OPEN(container_vp, flag, cred, l); 291 /* 292 * Drop the lock on the container, after we have done VOP_OPEN 293 * (which requires a locked vnode). 294 */ 295 VOP_UNLOCK(container_vp, 0); 296 return(error); 297 } 298 299 /* 300 * Close the cache file used for I/O and notify Venus. 301 */ 302 int 303 coda_close(void *v) 304 { 305 /* true args */ 306 struct vop_close_args *ap = v; 307 struct vnode *vp = ap->a_vp; 308 struct cnode *cp = VTOC(vp); 309 int flag = ap->a_fflag; 310 kauth_cred_t cred = ap->a_cred; 311 struct lwp *l = ap->a_l; 312 /* locals */ 313 int error; 314 315 MARK_ENTRY(CODA_CLOSE_STATS); 316 317 /* Check for close of control file. */ 318 if (IS_CTL_VP(vp)) { 319 MARK_INT_SAT(CODA_CLOSE_STATS); 320 return(0); 321 } 322 323 /* 324 * XXX The IS_UNMOUNTING part of this is very suspect. 325 */ 326 if (IS_UNMOUNTING(cp)) { 327 if (cp->c_ovp) { 328 #ifdef CODA_VERBOSE 329 printf("coda_close: destroying container ref %d, ufs vp %p of vp %p/cp %p\n", 330 vp->v_usecount, cp->c_ovp, vp, cp); 331 #endif 332 #ifdef hmm 333 vgone(cp->c_ovp); 334 #else 335 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 336 VOP_CLOSE(cp->c_ovp, flag, cred, l); /* Do errors matter here? */ 337 vput(cp->c_ovp); 338 #endif 339 } else { 340 #ifdef CODA_VERBOSE 341 printf("coda_close: NO container vp %p/cp %p\n", vp, cp); 342 #endif 343 } 344 return ENODEV; 345 } 346 347 /* Lock the container node, and VOP_CLOSE it. */ 348 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 349 VOP_CLOSE(cp->c_ovp, flag, cred, l); /* Do errors matter here? */ 350 /* 351 * Drop the lock we just obtained, and vrele the container vnode. 352 * Decrement reference counts, and clear container vnode pointer on 353 * last close. 354 */ 355 vput(cp->c_ovp); 356 if (flag & FWRITE) 357 --cp->c_owrite; 358 if (--cp->c_ocount == 0) 359 cp->c_ovp = NULL; 360 361 error = venus_close(vtomi(vp), &cp->c_fid, flag, cred, l); 362 363 CODADEBUG(CODA_CLOSE, myprintf(("close: result %d\n",error)); ) 364 return(error); 365 } 366 367 int 368 coda_read(void *v) 369 { 370 struct vop_read_args *ap = v; 371 372 ENTRY; 373 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_READ, 374 ap->a_ioflag, ap->a_cred, curlwp)); 375 } 376 377 int 378 coda_write(void *v) 379 { 380 struct vop_write_args *ap = v; 381 382 ENTRY; 383 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_WRITE, 384 ap->a_ioflag, ap->a_cred, curlwp)); 385 } 386 387 int 388 coda_rdwr(struct vnode *vp, struct uio *uiop, enum uio_rw rw, int ioflag, 389 kauth_cred_t cred, struct lwp *l) 390 { 391 /* upcall decl */ 392 /* NOTE: container file operation!!! */ 393 /* locals */ 394 struct cnode *cp = VTOC(vp); 395 struct vnode *cfvp = cp->c_ovp; 396 struct proc *p = l->l_proc; 397 int opened_internally = 0; 398 int error = 0; 399 400 MARK_ENTRY(CODA_RDWR_STATS); 401 402 CODADEBUG(CODA_RDWR, myprintf(("coda_rdwr(%d, %p, %lu, %lld)\n", rw, 403 uiop->uio_iov->iov_base, 404 (unsigned long) uiop->uio_resid, 405 (long long) uiop->uio_offset)); ) 406 407 /* Check for rdwr of control object. */ 408 if (IS_CTL_VP(vp)) { 409 MARK_INT_FAIL(CODA_RDWR_STATS); 410 return(EINVAL); 411 } 412 413 /* Redirect the request to UFS. */ 414 415 /* 416 * If file is not already open this must be a page 417 * {read,write} request. Iget the cache file's inode 418 * pointer if we still have its <device, inode> pair. 419 * Otherwise, we must do an internal open to derive the 420 * pair. 421 * XXX Integrate this into a coherent strategy for container 422 * file acquisition. 423 */ 424 if (cfvp == NULL) { 425 /* 426 * If we're dumping core, do the internal open. Otherwise 427 * venus won't have the correct size of the core when 428 * it's completely written. 429 */ 430 if (cp->c_inode != 0 && !(p && (p->p_acflag & ACORE))) { 431 printf("coda_rdwr: grabbing container vnode, losing reference\n"); 432 /* Get locked and refed vnode. */ 433 error = coda_grab_vnode(cp->c_device, cp->c_inode, &cfvp); 434 if (error) { 435 MARK_INT_FAIL(CODA_RDWR_STATS); 436 return(error); 437 } 438 /* 439 * Drop lock. 440 * XXX Where is reference released. 441 */ 442 VOP_UNLOCK(cfvp, 0); 443 } 444 else { 445 printf("coda_rdwr: internal VOP_OPEN\n"); 446 opened_internally = 1; 447 MARK_INT_GEN(CODA_OPEN_STATS); 448 error = VOP_OPEN(vp, (rw == UIO_READ ? FREAD : FWRITE), 449 cred, l); 450 #ifdef CODA_VERBOSE 451 printf("coda_rdwr: Internally Opening %p\n", vp); 452 #endif 453 if (error) { 454 MARK_INT_FAIL(CODA_RDWR_STATS); 455 return(error); 456 } 457 cfvp = cp->c_ovp; 458 } 459 } 460 461 /* Have UFS handle the call. */ 462 CODADEBUG(CODA_RDWR, myprintf(("indirect rdwr: fid = %s, refcnt = %d\n", 463 coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount)); ) 464 465 if (rw == UIO_READ) { 466 error = VOP_READ(cfvp, uiop, ioflag, cred); 467 } else { 468 error = VOP_WRITE(cfvp, uiop, ioflag, cred); 469 } 470 471 if (error) 472 MARK_INT_FAIL(CODA_RDWR_STATS); 473 else 474 MARK_INT_SAT(CODA_RDWR_STATS); 475 476 /* Do an internal close if necessary. */ 477 if (opened_internally) { 478 MARK_INT_GEN(CODA_CLOSE_STATS); 479 (void)VOP_CLOSE(vp, (rw == UIO_READ ? FREAD : FWRITE), cred, l); 480 } 481 482 /* Invalidate cached attributes if writing. */ 483 if (rw == UIO_WRITE) 484 cp->c_flags &= ~C_VATTR; 485 return(error); 486 } 487 488 int 489 coda_ioctl(void *v) 490 { 491 /* true args */ 492 struct vop_ioctl_args *ap = v; 493 struct vnode *vp = ap->a_vp; 494 int com = ap->a_command; 495 caddr_t data = ap->a_data; 496 int flag = ap->a_fflag; 497 kauth_cred_t cred = ap->a_cred; 498 struct lwp *l = ap->a_l; 499 /* locals */ 500 int error; 501 struct vnode *tvp; 502 struct nameidata ndp; 503 struct PioctlData *iap = (struct PioctlData *)data; 504 505 MARK_ENTRY(CODA_IOCTL_STATS); 506 507 CODADEBUG(CODA_IOCTL, myprintf(("in coda_ioctl on %s\n", iap->path));) 508 509 /* Don't check for operation on a dying object, for ctlvp it 510 shouldn't matter */ 511 512 /* Must be control object to succeed. */ 513 if (!IS_CTL_VP(vp)) { 514 MARK_INT_FAIL(CODA_IOCTL_STATS); 515 CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: vp != ctlvp"));) 516 return (EOPNOTSUPP); 517 } 518 /* Look up the pathname. */ 519 520 /* Should we use the name cache here? It would get it from 521 lookupname sooner or later anyway, right? */ 522 523 NDINIT(&ndp, LOOKUP, (iap->follow ? FOLLOW : NOFOLLOW), UIO_USERSPACE, 524 iap->path, l); 525 error = namei(&ndp); 526 tvp = ndp.ni_vp; 527 528 if (error) { 529 MARK_INT_FAIL(CODA_IOCTL_STATS); 530 CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: lookup returns %d\n", 531 error));) 532 return(error); 533 } 534 535 /* 536 * Make sure this is a coda style cnode, but it may be a 537 * different vfsp 538 */ 539 /* XXX: this totally violates the comment about vtagtype in vnode.h */ 540 if (tvp->v_tag != VT_CODA) { 541 vrele(tvp); 542 MARK_INT_FAIL(CODA_IOCTL_STATS); 543 CODADEBUG(CODA_IOCTL, 544 myprintf(("coda_ioctl error: %s not a coda object\n", 545 iap->path));) 546 return(EINVAL); 547 } 548 549 if (iap->vi.in_size > VC_MAXDATASIZE || iap->vi.out_size > VC_MAXDATASIZE) { 550 vrele(tvp); 551 return(EINVAL); 552 } 553 error = venus_ioctl(vtomi(tvp), &((VTOC(tvp))->c_fid), com, flag, data, cred, l); 554 555 if (error) 556 MARK_INT_FAIL(CODA_IOCTL_STATS); 557 else 558 CODADEBUG(CODA_IOCTL, myprintf(("Ioctl returns %d \n", error)); ) 559 560 vrele(tvp); 561 return(error); 562 } 563 564 /* 565 * To reduce the cost of a user-level venus;we cache attributes in 566 * the kernel. Each cnode has storage allocated for an attribute. If 567 * c_vattr is valid, return a reference to it. Otherwise, get the 568 * attributes from venus and store them in the cnode. There is some 569 * question if this method is a security leak. But I think that in 570 * order to make this call, the user must have done a lookup and 571 * opened the file, and therefore should already have access. 572 */ 573 int 574 coda_getattr(void *v) 575 { 576 /* true args */ 577 struct vop_getattr_args *ap = v; 578 struct vnode *vp = ap->a_vp; 579 struct cnode *cp = VTOC(vp); 580 struct vattr *vap = ap->a_vap; 581 kauth_cred_t cred = ap->a_cred; 582 struct lwp *l = ap->a_l; 583 /* locals */ 584 int error; 585 586 MARK_ENTRY(CODA_GETATTR_STATS); 587 588 /* Check for getattr of control object. */ 589 if (IS_CTL_VP(vp)) { 590 MARK_INT_FAIL(CODA_GETATTR_STATS); 591 return(ENOENT); 592 } 593 594 /* Check to see if the attributes have already been cached */ 595 if (VALID_VATTR(cp)) { 596 CODADEBUG(CODA_GETATTR, { myprintf(("attr cache hit: %s\n", 597 coda_f2s(&cp->c_fid)));}); 598 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 599 print_vattr(&cp->c_vattr); ); 600 601 *vap = cp->c_vattr; 602 MARK_INT_SAT(CODA_GETATTR_STATS); 603 return(0); 604 } 605 606 error = venus_getattr(vtomi(vp), &cp->c_fid, cred, l, vap); 607 608 if (!error) { 609 CODADEBUG(CODA_GETATTR, myprintf(("getattr miss %s: result %d\n", 610 coda_f2s(&cp->c_fid), error)); ) 611 612 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 613 print_vattr(vap); ); 614 615 /* If not open for write, store attributes in cnode */ 616 if ((cp->c_owrite == 0) && (coda_attr_cache)) { 617 cp->c_vattr = *vap; 618 cp->c_flags |= C_VATTR; 619 } 620 621 } 622 return(error); 623 } 624 625 int 626 coda_setattr(void *v) 627 { 628 /* true args */ 629 struct vop_setattr_args *ap = v; 630 struct vnode *vp = ap->a_vp; 631 struct cnode *cp = VTOC(vp); 632 struct vattr *vap = ap->a_vap; 633 kauth_cred_t cred = ap->a_cred; 634 struct lwp *l = ap->a_l; 635 /* locals */ 636 int error; 637 638 MARK_ENTRY(CODA_SETATTR_STATS); 639 640 /* Check for setattr of control object. */ 641 if (IS_CTL_VP(vp)) { 642 MARK_INT_FAIL(CODA_SETATTR_STATS); 643 return(ENOENT); 644 } 645 646 if (codadebug & CODADBGMSK(CODA_SETATTR)) { 647 print_vattr(vap); 648 } 649 error = venus_setattr(vtomi(vp), &cp->c_fid, vap, cred, l); 650 651 if (!error) 652 cp->c_flags &= ~C_VATTR; 653 654 CODADEBUG(CODA_SETATTR, myprintf(("setattr %d\n", error)); ) 655 return(error); 656 } 657 658 int 659 coda_access(void *v) 660 { 661 /* true args */ 662 struct vop_access_args *ap = v; 663 struct vnode *vp = ap->a_vp; 664 struct cnode *cp = VTOC(vp); 665 int mode = ap->a_mode; 666 kauth_cred_t cred = ap->a_cred; 667 struct lwp *l = ap->a_l; 668 /* locals */ 669 int error; 670 671 MARK_ENTRY(CODA_ACCESS_STATS); 672 673 /* Check for access of control object. Only read access is 674 allowed on it. */ 675 if (IS_CTL_VP(vp)) { 676 /* bogus hack - all will be marked as successes */ 677 MARK_INT_SAT(CODA_ACCESS_STATS); 678 return(((mode & VREAD) && !(mode & (VWRITE | VEXEC))) 679 ? 0 : EACCES); 680 } 681 682 /* 683 * if the file is a directory, and we are checking exec (eg lookup) 684 * access, and the file is in the namecache, then the user must have 685 * lookup access to it. 686 */ 687 if (coda_access_cache) { 688 if ((vp->v_type == VDIR) && (mode & VEXEC)) { 689 if (coda_nc_lookup(cp, ".", 1, cred)) { 690 MARK_INT_SAT(CODA_ACCESS_STATS); 691 return(0); /* it was in the cache */ 692 } 693 } 694 } 695 696 error = venus_access(vtomi(vp), &cp->c_fid, mode, cred, l); 697 698 return(error); 699 } 700 701 /* 702 * CODA abort op, called after namei() when a CREATE/DELETE isn't actually 703 * done. If a buffer has been saved in anticipation of a coda_create or 704 * a coda_remove, delete it. 705 */ 706 /* ARGSUSED */ 707 int 708 coda_abortop(void *v) 709 { 710 /* true args */ 711 struct vop_abortop_args /* { 712 struct vnode *a_dvp; 713 struct componentname *a_cnp; 714 } */ *ap = v; 715 /* upcall decl */ 716 /* locals */ 717 718 if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF) 719 PNBUF_PUT(ap->a_cnp->cn_pnbuf); 720 return (0); 721 } 722 723 int 724 coda_readlink(void *v) 725 { 726 /* true args */ 727 struct vop_readlink_args *ap = v; 728 struct vnode *vp = ap->a_vp; 729 struct cnode *cp = VTOC(vp); 730 struct uio *uiop = ap->a_uio; 731 kauth_cred_t cred = ap->a_cred; 732 /* locals */ 733 struct lwp *l = curlwp; 734 int error; 735 char *str; 736 int len; 737 738 MARK_ENTRY(CODA_READLINK_STATS); 739 740 /* Check for readlink of control object. */ 741 if (IS_CTL_VP(vp)) { 742 MARK_INT_FAIL(CODA_READLINK_STATS); 743 return(ENOENT); 744 } 745 746 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { /* symlink was cached */ 747 uiop->uio_rw = UIO_READ; 748 error = uiomove(cp->c_symlink, (int)cp->c_symlen, uiop); 749 if (error) 750 MARK_INT_FAIL(CODA_READLINK_STATS); 751 else 752 MARK_INT_SAT(CODA_READLINK_STATS); 753 return(error); 754 } 755 756 error = venus_readlink(vtomi(vp), &cp->c_fid, cred, l, &str, &len); 757 758 if (!error) { 759 uiop->uio_rw = UIO_READ; 760 error = uiomove(str, len, uiop); 761 762 if (coda_symlink_cache) { 763 cp->c_symlink = str; 764 cp->c_symlen = len; 765 cp->c_flags |= C_SYMLINK; 766 } else 767 CODA_FREE(str, len); 768 } 769 770 CODADEBUG(CODA_READLINK, myprintf(("in readlink result %d\n",error));) 771 return(error); 772 } 773 774 int 775 coda_fsync(void *v) 776 { 777 /* true args */ 778 struct vop_fsync_args *ap = v; 779 struct vnode *vp = ap->a_vp; 780 struct cnode *cp = VTOC(vp); 781 kauth_cred_t cred = ap->a_cred; 782 struct lwp *l = ap->a_l; 783 /* locals */ 784 struct vnode *convp = cp->c_ovp; 785 int error; 786 787 MARK_ENTRY(CODA_FSYNC_STATS); 788 789 /* Check for fsync on an unmounting object */ 790 /* The NetBSD kernel, in it's infinite wisdom, can try to fsync 791 * after an unmount has been initiated. This is a Bad Thing, 792 * which we have to avoid. Not a legitimate failure for stats. 793 */ 794 if (IS_UNMOUNTING(cp)) { 795 return(ENODEV); 796 } 797 798 /* Check for fsync of control object. */ 799 if (IS_CTL_VP(vp)) { 800 MARK_INT_SAT(CODA_FSYNC_STATS); 801 return(0); 802 } 803 804 if (convp) 805 VOP_FSYNC(convp, cred, MNT_WAIT, 0, 0, l); 806 807 /* 808 * We can expect fsync on any vnode at all if venus is pruging it. 809 * Venus can't very well answer the fsync request, now can it? 810 * Hopefully, it won't have to, because hopefully, venus preserves 811 * the (possibly untrue) invariant that it never purges an open 812 * vnode. Hopefully. 813 */ 814 if (cp->c_flags & C_PURGING) { 815 return(0); 816 } 817 818 error = venus_fsync(vtomi(vp), &cp->c_fid, cred, l); 819 820 CODADEBUG(CODA_FSYNC, myprintf(("in fsync result %d\n",error)); ); 821 return(error); 822 } 823 824 /* 825 * vp is locked on entry, and we must unlock it. 826 * XXX This routine is suspect and probably needs rewriting. 827 */ 828 int 829 coda_inactive(void *v) 830 { 831 /* true args */ 832 struct vop_inactive_args *ap = v; 833 struct vnode *vp = ap->a_vp; 834 struct cnode *cp = VTOC(vp); 835 kauth_cred_t cred __attribute__((unused)) = NULL; 836 struct lwp *l __attribute__((unused)) = ap->a_l; 837 838 /* We don't need to send inactive to venus - DCS */ 839 MARK_ENTRY(CODA_INACTIVE_STATS); 840 841 if (IS_CTL_VP(vp)) { 842 MARK_INT_SAT(CODA_INACTIVE_STATS); 843 return 0; 844 } 845 846 CODADEBUG(CODA_INACTIVE, myprintf(("in inactive, %s, vfsp %p\n", 847 coda_f2s(&cp->c_fid), vp->v_mount));) 848 849 /* If an array has been allocated to hold the symlink, deallocate it */ 850 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { 851 if (cp->c_symlink == NULL) 852 panic("coda_inactive: null symlink pointer in cnode"); 853 854 CODA_FREE(cp->c_symlink, cp->c_symlen); 855 cp->c_flags &= ~C_SYMLINK; 856 cp->c_symlen = 0; 857 } 858 859 /* Remove it from the table so it can't be found. */ 860 coda_unsave(cp); 861 if (vp->v_mount->mnt_data == NULL) { 862 myprintf(("Help! vfsp->vfs_data was NULL, but vnode %p wasn't dying\n", vp)); 863 panic("badness in coda_inactive"); 864 } 865 866 if (IS_UNMOUNTING(cp)) { 867 /* XXX Do we need to VOP_CLOSE container vnodes? */ 868 if (vp->v_usecount > 0) 869 printf("coda_inactive: IS_UNMOUNTING %p usecount %d\n", 870 vp, vp->v_usecount); 871 if (cp->c_ovp != NULL) 872 printf("coda_inactive: %p ovp != NULL\n", vp); 873 VOP_UNLOCK(vp, 0); 874 } else { 875 /* Sanity checks that perhaps should be panic. */ 876 if (vp->v_usecount) { 877 printf("coda_inactive: %p usecount %d\n", vp, vp->v_usecount); 878 } 879 if (cp->c_ovp != NULL) { 880 printf("coda_inactive: %p ovp != NULL\n", vp); 881 } 882 VOP_UNLOCK(vp, 0); 883 vgone(vp); 884 } 885 886 MARK_INT_SAT(CODA_INACTIVE_STATS); 887 return(0); 888 } 889 890 /* 891 * Coda does not use the normal namecache, but a private version. 892 * Consider how to use the standard facility instead. 893 */ 894 int 895 coda_lookup(void *v) 896 { 897 /* true args */ 898 struct vop_lookup_args *ap = v; 899 /* (locked) vnode of dir in which to do lookup */ 900 struct vnode *dvp = ap->a_dvp; 901 struct cnode *dcp = VTOC(dvp); 902 /* output variable for result */ 903 struct vnode **vpp = ap->a_vpp; 904 /* name to lookup */ 905 struct componentname *cnp = ap->a_cnp; 906 kauth_cred_t cred = cnp->cn_cred; 907 struct lwp *l = cnp->cn_lwp; 908 /* locals */ 909 struct cnode *cp; 910 const char *nm = cnp->cn_nameptr; 911 int len = cnp->cn_namelen; 912 int flags = cnp->cn_flags; 913 int isdot; 914 CodaFid VFid; 915 int vtype; 916 int error = 0; 917 918 MARK_ENTRY(CODA_LOOKUP_STATS); 919 920 CODADEBUG(CODA_LOOKUP, myprintf(("lookup: %s in %s\n", 921 nm, coda_f2s(&dcp->c_fid)));); 922 923 /* 924 * XXX componentname flags in MODMASK are not handled at all 925 */ 926 927 /* 928 * The overall strategy is to switch on the lookup type and get a 929 * result vnode that is vref'd but not locked. Then, the code at 930 * exit: switches on ., .., and regular lookups and does the right 931 * locking. 932 */ 933 934 /* Check for lookup of control object. */ 935 if (IS_CTL_NAME(dvp, nm, len)) { 936 *vpp = coda_ctlvp; 937 vref(*vpp); 938 MARK_INT_SAT(CODA_LOOKUP_STATS); 939 goto exit; 940 } 941 942 /* Avoid trying to hand venus an unreasonably long name. */ 943 if (len+1 > CODA_MAXNAMLEN) { 944 MARK_INT_FAIL(CODA_LOOKUP_STATS); 945 CODADEBUG(CODA_LOOKUP, myprintf(("name too long: lookup, %s (%s)\n", 946 coda_f2s(&dcp->c_fid), nm));); 947 *vpp = (struct vnode *)0; 948 error = EINVAL; 949 goto exit; 950 } 951 952 /* 953 * XXX Check for DOT lookups, and short circuit all the caches, 954 * just doing an extra vref. (venus guarantees that lookup of 955 * . returns self.) 956 */ 957 isdot = (len == 1 && nm[0] == '.'); 958 959 /* 960 * Try to resolve the lookup in the minicache. If that fails, ask 961 * venus to do the lookup. XXX The interaction between vnode 962 * locking and any locking that coda does is not clear. 963 */ 964 cp = coda_nc_lookup(dcp, nm, len, cred); 965 if (cp) { 966 *vpp = CTOV(cp); 967 vref(*vpp); 968 CODADEBUG(CODA_LOOKUP, 969 myprintf(("lookup result %d vpp %p\n",error,*vpp));) 970 } else { 971 /* The name wasn't cached, so ask Venus. */ 972 error = venus_lookup(vtomi(dvp), &dcp->c_fid, nm, len, cred, l, &VFid, &vtype); 973 974 if (error) { 975 MARK_INT_FAIL(CODA_LOOKUP_STATS); 976 CODADEBUG(CODA_LOOKUP, myprintf(("lookup error on %s (%s)%d\n", 977 coda_f2s(&dcp->c_fid), nm, error));) 978 *vpp = (struct vnode *)0; 979 } else { 980 MARK_INT_SAT(CODA_LOOKUP_STATS); 981 CODADEBUG(CODA_LOOKUP, 982 myprintf(("lookup: %s type %o result %d\n", 983 coda_f2s(&VFid), vtype, error)); ) 984 985 cp = make_coda_node(&VFid, dvp->v_mount, vtype); 986 *vpp = CTOV(cp); 987 /* vpp is now vrefed. */ 988 989 /* 990 * Unless this vnode is marked CODA_NOCACHE, enter it into 991 * the coda name cache to avoid a future venus round-trip. 992 * XXX Interaction with componentname NOCACHE is unclear. 993 */ 994 if (!(vtype & CODA_NOCACHE)) 995 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 996 } 997 } 998 999 exit: 1000 /* 1001 * If we are creating, and this was the last name to be looked up, 1002 * and the error was ENOENT, then make the leaf NULL and return 1003 * success. 1004 * XXX Check against new lookup rules. 1005 */ 1006 if (((cnp->cn_nameiop == CREATE) || (cnp->cn_nameiop == RENAME)) 1007 && (cnp->cn_flags & ISLASTCN) 1008 && (error == ENOENT)) 1009 { 1010 error = EJUSTRETURN; 1011 cnp->cn_flags |= SAVENAME; 1012 *ap->a_vpp = NULL; 1013 } 1014 1015 /* 1016 * If we are removing, and we are at the last element, and we 1017 * found it, then we need to keep the name around so that the 1018 * removal will go ahead as planned. 1019 * XXX Check against new lookup rules. 1020 */ 1021 if ((cnp->cn_nameiop == DELETE) 1022 && (cnp->cn_flags & ISLASTCN) 1023 && !error) 1024 { 1025 cnp->cn_flags |= SAVENAME; 1026 } 1027 1028 /* 1029 * If the lookup succeeded, we must generally lock the returned 1030 * vnode. This could be a ., .., or normal lookup. See 1031 * vnodeops(9) for the details. 1032 */ 1033 /* 1034 * XXX LK_RETRY is likely incorrect. Handle vn_lock failure 1035 * somehow, and remove LK_RETRY. 1036 */ 1037 if (!error || (error == EJUSTRETURN)) { 1038 /* Lookup has a value and it isn't "."? */ 1039 if (*ap->a_vpp && (*ap->a_vpp != dvp)) { 1040 if (flags & ISDOTDOT) 1041 /* ..: unlock parent */ 1042 VOP_UNLOCK(dvp, 0); 1043 /* all but .: lock child */ 1044 vn_lock(*ap->a_vpp, LK_EXCLUSIVE | LK_RETRY); 1045 if (flags & ISDOTDOT) 1046 /* ..: relock parent */ 1047 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1048 } 1049 /* else .: leave dvp locked */ 1050 } else { 1051 /* The lookup failed, so return NULL. Leave dvp locked. */ 1052 *ap->a_vpp = NULL; 1053 } 1054 return(error); 1055 } 1056 1057 /*ARGSUSED*/ 1058 int 1059 coda_create(void *v) 1060 { 1061 /* true args */ 1062 struct vop_create_args *ap = v; 1063 struct vnode *dvp = ap->a_dvp; 1064 struct cnode *dcp = VTOC(dvp); 1065 struct vattr *va = ap->a_vap; 1066 int exclusive = 1; 1067 int mode = ap->a_vap->va_mode; 1068 struct vnode **vpp = ap->a_vpp; 1069 struct componentname *cnp = ap->a_cnp; 1070 kauth_cred_t cred = cnp->cn_cred; 1071 struct lwp *l = cnp->cn_lwp; 1072 /* locals */ 1073 int error; 1074 struct cnode *cp; 1075 const char *nm = cnp->cn_nameptr; 1076 int len = cnp->cn_namelen; 1077 CodaFid VFid; 1078 struct vattr attr; 1079 1080 MARK_ENTRY(CODA_CREATE_STATS); 1081 1082 /* All creates are exclusive XXX */ 1083 /* I'm assuming the 'mode' argument is the file mode bits XXX */ 1084 1085 /* Check for create of control object. */ 1086 if (IS_CTL_NAME(dvp, nm, len)) { 1087 *vpp = (struct vnode *)0; 1088 MARK_INT_FAIL(CODA_CREATE_STATS); 1089 return(EACCES); 1090 } 1091 1092 error = venus_create(vtomi(dvp), &dcp->c_fid, nm, len, exclusive, mode, va, cred, l, &VFid, &attr); 1093 1094 if (!error) { 1095 1096 /* 1097 * XXX Violation of venus/kernel invariants is a difficult case, 1098 * but venus should not be able to cause a panic. 1099 */ 1100 /* If this is an exclusive create, panic if the file already exists. */ 1101 /* Venus should have detected the file and reported EEXIST. */ 1102 1103 if ((exclusive == 1) && 1104 (coda_find(&VFid) != NULL)) 1105 panic("cnode existed for newly created file!"); 1106 1107 cp = make_coda_node(&VFid, dvp->v_mount, attr.va_type); 1108 *vpp = CTOV(cp); 1109 1110 /* XXX vnodeops doesn't say this argument can be changed. */ 1111 /* Update va to reflect the new attributes. */ 1112 (*va) = attr; 1113 1114 /* Update the attribute cache and mark it as valid */ 1115 if (coda_attr_cache) { 1116 VTOC(*vpp)->c_vattr = attr; 1117 VTOC(*vpp)->c_flags |= C_VATTR; 1118 } 1119 1120 /* Invalidate parent's attr cache (modification time has changed). */ 1121 VTOC(dvp)->c_flags &= ~C_VATTR; 1122 1123 /* enter the new vnode in the Name Cache */ 1124 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1125 1126 CODADEBUG(CODA_CREATE, 1127 myprintf(("create: %s, result %d\n", 1128 coda_f2s(&VFid), error)); ) 1129 } else { 1130 *vpp = (struct vnode *)0; 1131 CODADEBUG(CODA_CREATE, myprintf(("create error %d\n", error));) 1132 } 1133 1134 /* 1135 * vnodeops(9) says that we must unlock the parent and lock the child. 1136 * XXX Should we lock the child first? 1137 */ 1138 vput(dvp); 1139 if (!error) { 1140 if ((cnp->cn_flags & LOCKLEAF) == 0) { 1141 /* This should not happen; flags are for lookup only. */ 1142 printf("coda_create: LOCKLEAF not set!\n"); 1143 } 1144 1145 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { 1146 /* XXX Perhaps avoid this panic. */ 1147 panic("coda_create: couldn't lock child"); 1148 } 1149 } 1150 1151 /* Per vnodeops(9), free name except on success and SAVESTART. */ 1152 if (error || (cnp->cn_flags & SAVESTART) == 0) { 1153 PNBUF_PUT(cnp->cn_pnbuf); 1154 } 1155 return(error); 1156 } 1157 1158 int 1159 coda_remove(void *v) 1160 { 1161 /* true args */ 1162 struct vop_remove_args *ap = v; 1163 struct vnode *dvp = ap->a_dvp; 1164 struct cnode *cp = VTOC(dvp); 1165 struct vnode *vp = ap->a_vp; 1166 struct componentname *cnp = ap->a_cnp; 1167 kauth_cred_t cred = cnp->cn_cred; 1168 struct lwp *l = cnp->cn_lwp; 1169 /* locals */ 1170 int error; 1171 const char *nm = cnp->cn_nameptr; 1172 int len = cnp->cn_namelen; 1173 struct cnode *tp; 1174 1175 MARK_ENTRY(CODA_REMOVE_STATS); 1176 1177 CODADEBUG(CODA_REMOVE, myprintf(("remove: %s in %s\n", 1178 nm, coda_f2s(&cp->c_fid)));); 1179 1180 /* Remove the file's entry from the CODA Name Cache */ 1181 /* We're being conservative here, it might be that this person 1182 * doesn't really have sufficient access to delete the file 1183 * but we feel zapping the entry won't really hurt anyone -- dcs 1184 */ 1185 /* I'm gonna go out on a limb here. If a file and a hardlink to it 1186 * exist, and one is removed, the link count on the other will be 1187 * off by 1. We could either invalidate the attrs if cached, or 1188 * fix them. I'll try to fix them. DCS 11/8/94 1189 */ 1190 tp = coda_nc_lookup(VTOC(dvp), nm, len, cred); 1191 if (tp) { 1192 if (VALID_VATTR(tp)) { /* If attrs are cached */ 1193 if (tp->c_vattr.va_nlink > 1) { /* If it's a hard link */ 1194 tp->c_vattr.va_nlink--; 1195 } 1196 } 1197 1198 coda_nc_zapfile(VTOC(dvp), nm, len); 1199 /* No need to flush it if it doesn't exist! */ 1200 } 1201 /* Invalidate the parent's attr cache, the modification time has changed */ 1202 VTOC(dvp)->c_flags &= ~C_VATTR; 1203 1204 /* Check for remove of control object. */ 1205 if (IS_CTL_NAME(dvp, nm, len)) { 1206 MARK_INT_FAIL(CODA_REMOVE_STATS); 1207 return(ENOENT); 1208 } 1209 1210 error = venus_remove(vtomi(dvp), &cp->c_fid, nm, len, cred, l); 1211 1212 CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n",error)); ) 1213 1214 /* 1215 * Unlock parent and child (avoiding double if "."). 1216 */ 1217 if (dvp == vp) { 1218 vrele(vp); 1219 } else { 1220 vput(vp); 1221 } 1222 vput(dvp); 1223 1224 return(error); 1225 } 1226 1227 /* 1228 * dvp is the directory where the link is to go, and is locked. 1229 * vp is the object to be linked to, and is unlocked. 1230 * At exit, we must unlock dvp, and vput dvp. 1231 */ 1232 int 1233 coda_link(void *v) 1234 { 1235 /* true args */ 1236 struct vop_link_args *ap = v; 1237 struct vnode *vp = ap->a_vp; 1238 struct cnode *cp = VTOC(vp); 1239 struct vnode *dvp = ap->a_dvp; 1240 struct cnode *dcp = VTOC(dvp); 1241 struct componentname *cnp = ap->a_cnp; 1242 kauth_cred_t cred = cnp->cn_cred; 1243 struct lwp *l = cnp->cn_lwp; 1244 /* locals */ 1245 int error; 1246 const char *nm = cnp->cn_nameptr; 1247 int len = cnp->cn_namelen; 1248 1249 MARK_ENTRY(CODA_LINK_STATS); 1250 1251 if (codadebug & CODADBGMSK(CODA_LINK)) { 1252 1253 myprintf(("nb_link: vp fid: %s\n", 1254 coda_f2s(&cp->c_fid))); 1255 myprintf(("nb_link: dvp fid: %s)\n", 1256 coda_f2s(&dcp->c_fid))); 1257 1258 } 1259 if (codadebug & CODADBGMSK(CODA_LINK)) { 1260 myprintf(("link: vp fid: %s\n", 1261 coda_f2s(&cp->c_fid))); 1262 myprintf(("link: dvp fid: %s\n", 1263 coda_f2s(&dcp->c_fid))); 1264 1265 } 1266 1267 /* Check for link to/from control object. */ 1268 if (IS_CTL_NAME(dvp, nm, len) || IS_CTL_VP(vp)) { 1269 MARK_INT_FAIL(CODA_LINK_STATS); 1270 return(EACCES); 1271 } 1272 1273 /* If linking . to a name, error out earlier. */ 1274 if (vp == dvp) { 1275 printf("coda_link vp==dvp\n"); 1276 error = EISDIR; 1277 goto exit; 1278 } 1279 1280 /* XXX Why does venus_link need the vnode to be locked?*/ 1281 if ((error = vn_lock(vp, LK_EXCLUSIVE)) != 0) { 1282 printf("coda_link: couldn't lock vnode %p\n", vp); 1283 error = EFAULT; /* XXX better value */ 1284 goto exit; 1285 } 1286 error = venus_link(vtomi(vp), &cp->c_fid, &dcp->c_fid, nm, len, cred, l); 1287 VOP_UNLOCK(vp, 0); 1288 1289 /* Invalidate parent's attr cache (the modification time has changed). */ 1290 VTOC(dvp)->c_flags &= ~C_VATTR; 1291 /* Invalidate child's attr cache (XXX why). */ 1292 VTOC(vp)->c_flags &= ~C_VATTR; 1293 1294 CODADEBUG(CODA_LINK, myprintf(("in link result %d\n",error)); ) 1295 1296 exit: 1297 vput(dvp); 1298 return(error); 1299 } 1300 1301 int 1302 coda_rename(void *v) 1303 { 1304 /* true args */ 1305 struct vop_rename_args *ap = v; 1306 struct vnode *odvp = ap->a_fdvp; 1307 struct cnode *odcp = VTOC(odvp); 1308 struct componentname *fcnp = ap->a_fcnp; 1309 struct vnode *ndvp = ap->a_tdvp; 1310 struct cnode *ndcp = VTOC(ndvp); 1311 struct componentname *tcnp = ap->a_tcnp; 1312 kauth_cred_t cred = fcnp->cn_cred; 1313 struct lwp *l = fcnp->cn_lwp; 1314 /* true args */ 1315 int error; 1316 const char *fnm = fcnp->cn_nameptr; 1317 int flen = fcnp->cn_namelen; 1318 const char *tnm = tcnp->cn_nameptr; 1319 int tlen = tcnp->cn_namelen; 1320 1321 MARK_ENTRY(CODA_RENAME_STATS); 1322 1323 /* Hmmm. The vnodes are already looked up. Perhaps they are locked? 1324 This could be Bad. XXX */ 1325 #ifdef OLD_DIAGNOSTIC 1326 if ((fcnp->cn_cred != tcnp->cn_cred) 1327 || (fcnp->cn_lwp != tcnp->cn_lwp)) 1328 { 1329 panic("coda_rename: component names don't agree"); 1330 } 1331 #endif 1332 1333 /* Check for rename involving control object. */ 1334 if (IS_CTL_NAME(odvp, fnm, flen) || IS_CTL_NAME(ndvp, tnm, tlen)) { 1335 MARK_INT_FAIL(CODA_RENAME_STATS); 1336 return(EACCES); 1337 } 1338 1339 /* Problem with moving directories -- need to flush entry for .. */ 1340 if (odvp != ndvp) { 1341 struct cnode *ovcp = coda_nc_lookup(VTOC(odvp), fnm, flen, cred); 1342 if (ovcp) { 1343 struct vnode *ovp = CTOV(ovcp); 1344 if ((ovp) && 1345 (ovp->v_type == VDIR)) /* If it's a directory */ 1346 coda_nc_zapfile(VTOC(ovp),"..", 2); 1347 } 1348 } 1349 1350 /* Remove the entries for both source and target files */ 1351 coda_nc_zapfile(VTOC(odvp), fnm, flen); 1352 coda_nc_zapfile(VTOC(ndvp), tnm, tlen); 1353 1354 /* Invalidate the parent's attr cache, the modification time has changed */ 1355 VTOC(odvp)->c_flags &= ~C_VATTR; 1356 VTOC(ndvp)->c_flags &= ~C_VATTR; 1357 1358 if (flen+1 > CODA_MAXNAMLEN) { 1359 MARK_INT_FAIL(CODA_RENAME_STATS); 1360 error = EINVAL; 1361 goto exit; 1362 } 1363 1364 if (tlen+1 > CODA_MAXNAMLEN) { 1365 MARK_INT_FAIL(CODA_RENAME_STATS); 1366 error = EINVAL; 1367 goto exit; 1368 } 1369 1370 error = venus_rename(vtomi(odvp), &odcp->c_fid, &ndcp->c_fid, fnm, flen, tnm, tlen, cred, l); 1371 1372 exit: 1373 CODADEBUG(CODA_RENAME, myprintf(("in rename result %d\n",error));) 1374 /* XXX - do we need to call cache pureg on the moved vnode? */ 1375 cache_purge(ap->a_fvp); 1376 1377 /* It seems to be incumbent on us to drop locks on all four vnodes */ 1378 /* From-vnodes are not locked, only ref'd. To-vnodes are locked. */ 1379 1380 vrele(ap->a_fvp); 1381 vrele(odvp); 1382 1383 if (ap->a_tvp) { 1384 if (ap->a_tvp == ndvp) { 1385 vrele(ap->a_tvp); 1386 } else { 1387 vput(ap->a_tvp); 1388 } 1389 } 1390 1391 vput(ndvp); 1392 return(error); 1393 } 1394 1395 int 1396 coda_mkdir(void *v) 1397 { 1398 /* true args */ 1399 struct vop_mkdir_args *ap = v; 1400 struct vnode *dvp = ap->a_dvp; 1401 struct cnode *dcp = VTOC(dvp); 1402 struct componentname *cnp = ap->a_cnp; 1403 struct vattr *va = ap->a_vap; 1404 struct vnode **vpp = ap->a_vpp; 1405 kauth_cred_t cred = cnp->cn_cred; 1406 struct lwp *l = cnp->cn_lwp; 1407 /* locals */ 1408 int error; 1409 const char *nm = cnp->cn_nameptr; 1410 int len = cnp->cn_namelen; 1411 struct cnode *cp; 1412 CodaFid VFid; 1413 struct vattr ova; 1414 1415 MARK_ENTRY(CODA_MKDIR_STATS); 1416 1417 /* Check for mkdir of target object. */ 1418 if (IS_CTL_NAME(dvp, nm, len)) { 1419 *vpp = (struct vnode *)0; 1420 MARK_INT_FAIL(CODA_MKDIR_STATS); 1421 return(EACCES); 1422 } 1423 1424 if (len+1 > CODA_MAXNAMLEN) { 1425 *vpp = (struct vnode *)0; 1426 MARK_INT_FAIL(CODA_MKDIR_STATS); 1427 return(EACCES); 1428 } 1429 1430 error = venus_mkdir(vtomi(dvp), &dcp->c_fid, nm, len, va, cred, l, &VFid, &ova); 1431 1432 if (!error) { 1433 if (coda_find(&VFid) != NULL) 1434 panic("cnode existed for newly created directory!"); 1435 1436 1437 cp = make_coda_node(&VFid, dvp->v_mount, va->va_type); 1438 *vpp = CTOV(cp); 1439 1440 /* enter the new vnode in the Name Cache */ 1441 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1442 1443 /* as a side effect, enter "." and ".." for the directory */ 1444 coda_nc_enter(VTOC(*vpp), ".", 1, cred, VTOC(*vpp)); 1445 coda_nc_enter(VTOC(*vpp), "..", 2, cred, VTOC(dvp)); 1446 1447 if (coda_attr_cache) { 1448 VTOC(*vpp)->c_vattr = ova; /* update the attr cache */ 1449 VTOC(*vpp)->c_flags |= C_VATTR; /* Valid attributes in cnode */ 1450 } 1451 1452 /* Invalidate the parent's attr cache, the modification time has changed */ 1453 VTOC(dvp)->c_flags &= ~C_VATTR; 1454 1455 CODADEBUG( CODA_MKDIR, myprintf(("mkdir: %s result %d\n", 1456 coda_f2s(&VFid), error)); ) 1457 } else { 1458 *vpp = (struct vnode *)0; 1459 CODADEBUG(CODA_MKDIR, myprintf(("mkdir error %d\n",error));) 1460 } 1461 1462 /* 1463 * Currently, all mkdirs explicitly vput their dvp's. 1464 * It also appears that we *must* lock the vpp, since 1465 * lockleaf isn't set, but someone down the road is going 1466 * to try to unlock the new directory. 1467 */ 1468 vput(dvp); 1469 if (!error) { 1470 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { 1471 panic("coda_mkdir: couldn't lock child"); 1472 } 1473 } 1474 1475 /* Per vnodeops(9), free name except on success and SAVESTART. */ 1476 if (error || (cnp->cn_flags & SAVESTART) == 0) { 1477 PNBUF_PUT(cnp->cn_pnbuf); 1478 } 1479 return(error); 1480 } 1481 1482 int 1483 coda_rmdir(void *v) 1484 { 1485 /* true args */ 1486 struct vop_rmdir_args *ap = v; 1487 struct vnode *dvp = ap->a_dvp; 1488 struct cnode *dcp = VTOC(dvp); 1489 struct vnode *vp = ap->a_vp; 1490 struct componentname *cnp = ap->a_cnp; 1491 kauth_cred_t cred = cnp->cn_cred; 1492 struct lwp *l = cnp->cn_lwp; 1493 /* true args */ 1494 int error; 1495 const char *nm = cnp->cn_nameptr; 1496 int len = cnp->cn_namelen; 1497 struct cnode *cp; 1498 1499 MARK_ENTRY(CODA_RMDIR_STATS); 1500 1501 /* Check for rmdir of control object. */ 1502 if (IS_CTL_NAME(dvp, nm, len)) { 1503 MARK_INT_FAIL(CODA_RMDIR_STATS); 1504 return(ENOENT); 1505 } 1506 1507 /* Can't remove . in self. */ 1508 if (dvp == vp) { 1509 printf("coda_rmdir: dvp == vp\n"); 1510 error = EINVAL; 1511 goto exit; 1512 } 1513 1514 /* 1515 * The caller may not have adequate permissions, and the venus 1516 * operation may fail, but it doesn't hurt from a correctness 1517 * viewpoint to invalidate cache entries. 1518 * XXX Why isn't this done after the venus_rmdir call? 1519 */ 1520 /* Look up child in name cache (by name, from parent). */ 1521 cp = coda_nc_lookup(dcp, nm, len, cred); 1522 /* If found, remove all children of the child (., ..). */ 1523 if (cp) coda_nc_zapParentfid(&(cp->c_fid), NOT_DOWNCALL); 1524 1525 /* Remove child's own entry. */ 1526 coda_nc_zapfile(dcp, nm, len); 1527 1528 /* Invalidate parent's attr cache (the modification time has changed). */ 1529 dcp->c_flags &= ~C_VATTR; 1530 1531 error = venus_rmdir(vtomi(dvp), &dcp->c_fid, nm, len, cred, l); 1532 1533 CODADEBUG(CODA_RMDIR, myprintf(("in rmdir result %d\n", error)); ) 1534 1535 exit: 1536 /* vput both vnodes */ 1537 vput(dvp); 1538 if (dvp == vp) { 1539 vrele(vp); 1540 } else { 1541 vput(vp); 1542 } 1543 1544 return(error); 1545 } 1546 1547 int 1548 coda_symlink(void *v) 1549 { 1550 /* true args */ 1551 struct vop_symlink_args *ap = v; 1552 struct vnode *dvp = ap->a_dvp; 1553 struct cnode *dcp = VTOC(dvp); 1554 /* a_vpp is used in place below */ 1555 struct componentname *cnp = ap->a_cnp; 1556 struct vattr *tva = ap->a_vap; 1557 char *path = ap->a_target; 1558 kauth_cred_t cred = cnp->cn_cred; 1559 struct lwp *l = cnp->cn_lwp; 1560 /* locals */ 1561 int error; 1562 u_long saved_cn_flags; 1563 const char *nm = cnp->cn_nameptr; 1564 int len = cnp->cn_namelen; 1565 int plen = strlen(path); 1566 1567 /* 1568 * Here's the strategy for the moment: perform the symlink, then 1569 * do a lookup to grab the resulting vnode. I know this requires 1570 * two communications with Venus for a new sybolic link, but 1571 * that's the way the ball bounces. I don't yet want to change 1572 * the way the Mach symlink works. When Mach support is 1573 * deprecated, we should change symlink so that the common case 1574 * returns the resultant vnode in a vpp argument. 1575 */ 1576 1577 MARK_ENTRY(CODA_SYMLINK_STATS); 1578 1579 /* Check for symlink of control object. */ 1580 if (IS_CTL_NAME(dvp, nm, len)) { 1581 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1582 error = EACCES; 1583 goto exit; 1584 } 1585 1586 if (plen+1 > CODA_MAXPATHLEN) { 1587 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1588 error = EINVAL; 1589 goto exit; 1590 } 1591 1592 if (len+1 > CODA_MAXNAMLEN) { 1593 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1594 error = EINVAL; 1595 goto exit; 1596 } 1597 1598 error = venus_symlink(vtomi(dvp), &dcp->c_fid, path, plen, nm, len, tva, cred, l); 1599 1600 /* Invalidate the parent's attr cache (modification time has changed). */ 1601 dcp->c_flags &= ~C_VATTR; 1602 1603 if (!error) { 1604 /* 1605 * VOP_SYMLINK is not defined to pay attention to cnp->cn_flags; 1606 * these are defined only for VOP_LOOKUP. We desire to reuse 1607 * cnp for a VOP_LOOKUP operation, and must be sure to not pass 1608 * stray flags passed to us. Such stray flags can occur because 1609 * sys_symlink makes a namei call and then reuses the 1610 * componentname structure. 1611 */ 1612 /* 1613 * XXX Arguably we should create our own componentname structure 1614 * and not reuse the one that was passed in. 1615 */ 1616 saved_cn_flags = cnp->cn_flags; 1617 cnp->cn_flags &= ~(MODMASK | OPMASK); 1618 cnp->cn_flags |= LOOKUP; 1619 error = VOP_LOOKUP(dvp, ap->a_vpp, cnp); 1620 cnp->cn_flags = saved_cn_flags; 1621 /* Either an error occurs, or ap->a_vpp is locked. */ 1622 } 1623 1624 exit: 1625 /* unlock and deference parent */ 1626 vput(dvp); 1627 1628 /* Per vnodeops(9), free name except on success and SAVESTART. */ 1629 if (error || (cnp->cn_flags & SAVESTART) == 0) { 1630 PNBUF_PUT(cnp->cn_pnbuf); 1631 } 1632 1633 CODADEBUG(CODA_SYMLINK, myprintf(("in symlink result %d\n",error)); ) 1634 return(error); 1635 } 1636 1637 /* 1638 * Read directory entries. 1639 */ 1640 int 1641 coda_readdir(void *v) 1642 { 1643 /* true args */ 1644 struct vop_readdir_args *ap = v; 1645 struct vnode *vp = ap->a_vp; 1646 struct cnode *cp = VTOC(vp); 1647 struct uio *uiop = ap->a_uio; 1648 kauth_cred_t cred = ap->a_cred; 1649 int *eofflag = ap->a_eofflag; 1650 off_t **cookies = ap->a_cookies; 1651 int *ncookies = ap->a_ncookies; 1652 /* upcall decl */ 1653 /* locals */ 1654 struct lwp *l = curlwp; 1655 int error = 0; 1656 1657 MARK_ENTRY(CODA_READDIR_STATS); 1658 1659 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)); ) 1660 1661 /* Check for readdir of control object. */ 1662 if (IS_CTL_VP(vp)) { 1663 MARK_INT_FAIL(CODA_READDIR_STATS); 1664 return(ENOENT); 1665 } 1666 1667 { 1668 /* Redirect the request to UFS. */ 1669 1670 /* If directory is not already open do an "internal open" on it. */ 1671 int opened_internally = 0; 1672 if (cp->c_ovp == NULL) { 1673 opened_internally = 1; 1674 MARK_INT_GEN(CODA_OPEN_STATS); 1675 error = VOP_OPEN(vp, FREAD, cred, l); 1676 #ifdef CODA_VERBOSE 1677 printf("coda_readdir: Internally Opening %p\n", vp); 1678 #endif 1679 if (error) return(error); 1680 } else 1681 vp = cp->c_ovp; 1682 1683 /* Have UFS handle the call. */ 1684 CODADEBUG(CODA_READDIR, myprintf(( 1685 "indirect readdir: fid = %s, refcnt = %d\n", 1686 coda_f2s(&cp->c_fid), vp->v_usecount)); ) 1687 error = VOP_READDIR(vp, uiop, cred, eofflag, cookies, ncookies); 1688 if (error) 1689 MARK_INT_FAIL(CODA_READDIR_STATS); 1690 else 1691 MARK_INT_SAT(CODA_READDIR_STATS); 1692 1693 /* Do an "internal close" if necessary. */ 1694 if (opened_internally) { 1695 MARK_INT_GEN(CODA_CLOSE_STATS); 1696 (void)VOP_CLOSE(vp, FREAD, cred, l); 1697 } 1698 } 1699 1700 return(error); 1701 } 1702 1703 /* 1704 * Convert from file system blocks to device blocks 1705 */ 1706 int 1707 coda_bmap(void *v) 1708 { 1709 /* XXX on the global proc */ 1710 /* true args */ 1711 struct vop_bmap_args *ap = v; 1712 struct vnode *vp __attribute__((unused)) = ap->a_vp; /* file's vnode */ 1713 daddr_t bn __attribute__((unused)) = ap->a_bn; /* fs block number */ 1714 struct vnode **vpp = ap->a_vpp; /* RETURN vp of device */ 1715 daddr_t *bnp __attribute__((unused)) = ap->a_bnp; /* RETURN device block number */ 1716 struct lwp *l __attribute__((unused)) = curlwp; 1717 /* upcall decl */ 1718 /* locals */ 1719 1720 *vpp = (struct vnode *)0; 1721 myprintf(("coda_bmap called!\n")); 1722 return(EINVAL); 1723 } 1724 1725 /* 1726 * I don't think the following two things are used anywhere, so I've 1727 * commented them out 1728 * 1729 * struct buf *async_bufhead; 1730 * int async_daemon_count; 1731 */ 1732 int 1733 coda_strategy(void *v) 1734 { 1735 /* true args */ 1736 struct vop_strategy_args *ap = v; 1737 struct buf *bp __attribute__((unused)) = ap->a_bp; 1738 struct lwp *l __attribute__((unused)) = curlwp; 1739 /* upcall decl */ 1740 /* locals */ 1741 1742 myprintf(("coda_strategy called! ")); 1743 return(EINVAL); 1744 } 1745 1746 int 1747 coda_reclaim(void *v) 1748 { 1749 /* true args */ 1750 struct vop_reclaim_args *ap = v; 1751 struct vnode *vp = ap->a_vp; 1752 struct cnode *cp = VTOC(vp); 1753 /* upcall decl */ 1754 /* locals */ 1755 1756 /* 1757 * Forced unmount/flush will let vnodes with non zero use be destroyed! 1758 */ 1759 ENTRY; 1760 1761 if (IS_UNMOUNTING(cp)) { 1762 #ifdef DEBUG 1763 if (VTOC(vp)->c_ovp) { 1764 if (IS_UNMOUNTING(cp)) 1765 printf("coda_reclaim: c_ovp not void: vp %p, cp %p\n", vp, cp); 1766 } 1767 #endif 1768 } else { 1769 #ifdef OLD_DIAGNOSTIC 1770 if (vp->v_usecount != 0) 1771 print("coda_reclaim: pushing active %p\n", vp); 1772 if (VTOC(vp)->c_ovp) { 1773 panic("coda_reclaim: c_ovp not void"); 1774 } 1775 #endif 1776 } 1777 cache_purge(vp); 1778 coda_free(VTOC(vp)); 1779 SET_VTOC(vp) = NULL; 1780 return (0); 1781 } 1782 1783 int 1784 coda_lock(void *v) 1785 { 1786 /* true args */ 1787 struct vop_lock_args *ap = v; 1788 struct vnode *vp = ap->a_vp; 1789 struct cnode *cp = VTOC(vp); 1790 /* upcall decl */ 1791 /* locals */ 1792 1793 ENTRY; 1794 1795 if (coda_lockdebug) { 1796 myprintf(("Attempting lock on %s\n", 1797 coda_f2s(&cp->c_fid))); 1798 } 1799 1800 return (lockmgr(&vp->v_lock, ap->a_flags, &vp->v_interlock)); 1801 } 1802 1803 int 1804 coda_unlock(void *v) 1805 { 1806 /* true args */ 1807 struct vop_unlock_args *ap = v; 1808 struct vnode *vp = ap->a_vp; 1809 struct cnode *cp = VTOC(vp); 1810 /* upcall decl */ 1811 /* locals */ 1812 1813 ENTRY; 1814 if (coda_lockdebug) { 1815 myprintf(("Attempting unlock on %s\n", 1816 coda_f2s(&cp->c_fid))); 1817 } 1818 1819 return (lockmgr(&vp->v_lock, ap->a_flags | LK_RELEASE, &vp->v_interlock)); 1820 } 1821 1822 int 1823 coda_islocked(void *v) 1824 { 1825 /* true args */ 1826 struct vop_islocked_args *ap = v; 1827 ENTRY; 1828 1829 return (lockstatus(&ap->a_vp->v_lock)); 1830 } 1831 1832 /* 1833 * Given a device and inode, obtain a locked vnode. One reference is 1834 * obtained and passed back to the caller. 1835 */ 1836 int 1837 coda_grab_vnode(dev_t dev, ino_t ino, struct vnode **vpp) 1838 { 1839 int error; 1840 struct mount *mp; 1841 1842 /* Obtain mount point structure from device. */ 1843 if (!(mp = devtomp(dev))) { 1844 myprintf(("coda_grab_vnode: devtomp(%d) returns NULL\n", dev)); 1845 return(ENXIO); 1846 } 1847 1848 /* 1849 * Obtain vnode from mount point and inode. 1850 * XXX VFS_VGET does not clearly define locked/referenced state of 1851 * returned vnode. 1852 */ 1853 error = VFS_VGET(mp, ino, vpp); 1854 if (error) { 1855 myprintf(("coda_grab_vnode: iget/vget(%d, %llu) returns %p, err %d\n", 1856 dev, (unsigned long long)ino, *vpp, error)); 1857 return(ENOENT); 1858 } 1859 return(0); 1860 } 1861 1862 void 1863 print_vattr(struct vattr *attr) 1864 { 1865 const char *typestr; 1866 1867 switch (attr->va_type) { 1868 case VNON: 1869 typestr = "VNON"; 1870 break; 1871 case VREG: 1872 typestr = "VREG"; 1873 break; 1874 case VDIR: 1875 typestr = "VDIR"; 1876 break; 1877 case VBLK: 1878 typestr = "VBLK"; 1879 break; 1880 case VCHR: 1881 typestr = "VCHR"; 1882 break; 1883 case VLNK: 1884 typestr = "VLNK"; 1885 break; 1886 case VSOCK: 1887 typestr = "VSCK"; 1888 break; 1889 case VFIFO: 1890 typestr = "VFFO"; 1891 break; 1892 case VBAD: 1893 typestr = "VBAD"; 1894 break; 1895 default: 1896 typestr = "????"; 1897 break; 1898 } 1899 1900 1901 myprintf(("attr: type %s mode %d uid %d gid %d fsid %d rdev %d\n", 1902 typestr, (int)attr->va_mode, (int)attr->va_uid, 1903 (int)attr->va_gid, (int)attr->va_fsid, (int)attr->va_rdev)); 1904 1905 myprintf((" fileid %d nlink %d size %d blocksize %d bytes %d\n", 1906 (int)attr->va_fileid, (int)attr->va_nlink, 1907 (int)attr->va_size, 1908 (int)attr->va_blocksize,(int)attr->va_bytes)); 1909 myprintf((" gen %ld flags %ld vaflags %d\n", 1910 attr->va_gen, attr->va_flags, attr->va_vaflags)); 1911 myprintf((" atime sec %d nsec %d\n", 1912 (int)attr->va_atime.tv_sec, (int)attr->va_atime.tv_nsec)); 1913 myprintf((" mtime sec %d nsec %d\n", 1914 (int)attr->va_mtime.tv_sec, (int)attr->va_mtime.tv_nsec)); 1915 myprintf((" ctime sec %d nsec %d\n", 1916 (int)attr->va_ctime.tv_sec, (int)attr->va_ctime.tv_nsec)); 1917 } 1918 1919 /* How to print a ucred */ 1920 void 1921 print_cred(kauth_cred_t cred) 1922 { 1923 1924 uint16_t ngroups; 1925 int i; 1926 1927 myprintf(("ref %d\tuid %d\n", kauth_cred_getrefcnt(cred), 1928 kauth_cred_geteuid(cred))); 1929 1930 ngroups = kauth_cred_ngroups(cred); 1931 for (i=0; i < ngroups; i++) 1932 myprintf(("\tgroup %d: (%d)\n", i, kauth_cred_group(cred, i))); 1933 myprintf(("\n")); 1934 1935 } 1936 1937 /* 1938 * Return a vnode for the given fid. 1939 * If no cnode exists for this fid create one and put it 1940 * in a table hashed by coda_f2i(). If the cnode for 1941 * this fid is already in the table return it (ref count is 1942 * incremented by coda_find. The cnode will be flushed from the 1943 * table when coda_inactive calls coda_unsave. 1944 */ 1945 struct cnode * 1946 make_coda_node(CodaFid *fid, struct mount *vfsp, short type) 1947 { 1948 struct cnode *cp; 1949 int err; 1950 1951 if ((cp = coda_find(fid)) == NULL) { 1952 struct vnode *vp; 1953 1954 cp = coda_alloc(); 1955 cp->c_fid = *fid; 1956 1957 err = getnewvnode(VT_CODA, vfsp, coda_vnodeop_p, &vp); 1958 if (err) { 1959 panic("coda: getnewvnode returned error %d", err); 1960 } 1961 vp->v_data = cp; 1962 vp->v_type = type; 1963 cp->c_vnode = vp; 1964 coda_save(cp); 1965 1966 } else { 1967 vref(CTOV(cp)); 1968 } 1969 1970 return cp; 1971 } 1972 1973 /* 1974 * coda_getpages may be called on a vnode which has not been opened, 1975 * e.g. to fault in pages to execute a program. In that case, we must 1976 * open the file to get the container. The vnode may or may not be 1977 * locked, and we must leave it in the same state. 1978 * XXX The protocol requires v_uobj.vmobjlock to be 1979 * held by caller, but this isn't documented in vnodeops(9) or vnode_if.src. 1980 */ 1981 int 1982 coda_getpages(void *v) 1983 { 1984 struct vop_getpages_args /* { 1985 struct vnode *a_vp; 1986 voff_t a_offset; 1987 struct vm_page **a_m; 1988 int *a_count; 1989 int a_centeridx; 1990 vm_prot_t a_access_type; 1991 int a_advice; 1992 int a_flags; 1993 } */ *ap = v; 1994 struct vnode *vp = ap->a_vp; 1995 struct cnode *cp = VTOC(vp); 1996 struct lwp *l = curlwp; 1997 kauth_cred_t cred = l->l_cred; 1998 int error, cerror; 1999 int waslocked; /* 1 if vnode lock was held on entry */ 2000 int didopen = 0; /* 1 if we opened container file */ 2001 2002 /* 2003 * Handle a case that uvm_fault doesn't quite use yet. 2004 * See layer_vnops.c. for inspiration. 2005 */ 2006 if (ap->a_flags & PGO_LOCKED) { 2007 return EBUSY; 2008 } 2009 2010 /* Check for control object. */ 2011 if (IS_CTL_VP(vp)) { 2012 printf("coda_getpages: control object %p\n", vp); 2013 simple_unlock(&vp->v_uobj.vmobjlock); 2014 return(EINVAL); 2015 } 2016 2017 /* 2018 * XXX It's really not ok to be releasing the lock we get, 2019 * because we could be overlapping with another call to 2020 * getpages and drop a lock they are relying on. We need to 2021 * figure out whether getpages ever is called holding the 2022 * lock, and if we should serialize getpages calls by some 2023 * mechanism. 2024 */ 2025 waslocked = VOP_ISLOCKED(vp); 2026 2027 /* Drop the vmobject lock. */ 2028 simple_unlock(&vp->v_uobj.vmobjlock); 2029 2030 /* Get container file if not already present. */ 2031 if (cp->c_ovp == NULL) { 2032 /* 2033 * VOP_OPEN requires a locked vnode. We must avoid 2034 * locking the vnode if it is already locked, and 2035 * leave it in the same state on exit. 2036 */ 2037 if (waslocked == 0) { 2038 cerror = vn_lock(vp, LK_EXCLUSIVE); 2039 if (cerror) { 2040 printf("coda_getpages: can't lock vnode %p\n", 2041 vp); 2042 return cerror; 2043 } 2044 #if 0 2045 printf("coda_getpages: locked vnode %p\n", vp); 2046 #endif 2047 } 2048 2049 /* 2050 * Open file (causes upcall to venus). 2051 * XXX Perhaps we should not fully open the file, but 2052 * simply obtain a container file. 2053 */ 2054 /* XXX Is it ok to do this while holding the simplelock? */ 2055 cerror = VOP_OPEN(vp, FREAD, cred, l); 2056 2057 if (cerror) { 2058 printf("coda_getpages: cannot open vnode %p => %d\n", 2059 vp, cerror); 2060 if (waslocked == 0) 2061 VOP_UNLOCK(vp, 0); 2062 return cerror; 2063 } 2064 2065 #if 0 2066 printf("coda_getpages: opened vnode %p\n", vp); 2067 #endif 2068 didopen = 1; 2069 } 2070 KASSERT(cp->c_ovp != NULL); 2071 2072 /* Munge the arg structure to refer to the container vnode. */ 2073 ap->a_vp = cp->c_ovp; 2074 2075 /* Get the lock on the container vnode, and call getpages on it. */ 2076 simple_lock(&ap->a_vp->v_uobj.vmobjlock); 2077 error = VCALL(ap->a_vp, VOFFSET(vop_getpages), ap); 2078 2079 /* If we opened the vnode, we must close it. */ 2080 if (didopen) { 2081 /* 2082 * VOP_CLOSE requires a locked vnode, but we are still 2083 * holding the lock (or riding a caller's lock). 2084 */ 2085 cerror = VOP_CLOSE(vp, FREAD, cred, l); 2086 if (cerror != 0) 2087 /* XXX How should we handle this? */ 2088 printf("coda_getpages: closed vnode %p -> %d\n", 2089 vp, cerror); 2090 2091 /* If we obtained a lock, drop it. */ 2092 if (waslocked == 0) 2093 VOP_UNLOCK(vp, 0); 2094 } 2095 2096 return error; 2097 } 2098 2099 /* 2100 * The protocol requires v_uobj.vmobjlock to be held by the caller, as 2101 * documented in vnodeops(9). XXX vnode_if.src doesn't say this. 2102 */ 2103 int 2104 coda_putpages(void *v) 2105 { 2106 struct vop_putpages_args /* { 2107 struct vnode *a_vp; 2108 voff_t a_offlo; 2109 voff_t a_offhi; 2110 int a_flags; 2111 } */ *ap = v; 2112 struct vnode *vp = ap->a_vp; 2113 struct cnode *cp = VTOC(vp); 2114 int error; 2115 2116 /* Drop the vmobject lock. */ 2117 simple_unlock(&vp->v_uobj.vmobjlock); 2118 2119 /* Check for control object. */ 2120 if (IS_CTL_VP(vp)) { 2121 printf("coda_putpages: control object %p\n", vp); 2122 return(EINVAL); 2123 } 2124 2125 /* 2126 * If container object is not present, then there are no pages 2127 * to put; just return without error. This happens all the 2128 * time, apparently during discard of a closed vnode (which 2129 * trivially can't have dirty pages). 2130 */ 2131 if (cp->c_ovp == NULL) 2132 return 0; 2133 2134 /* Munge the arg structure to refer to the container vnode. */ 2135 ap->a_vp = cp->c_ovp; 2136 2137 /* Get the lock on the container vnode, and call putpages on it. */ 2138 simple_lock(&ap->a_vp->v_uobj.vmobjlock); 2139 error = VCALL(ap->a_vp, VOFFSET(vop_putpages), ap); 2140 2141 return error; 2142 } 2143
Indexes created Tue Oct 14 15:09:51 GMT 2025