coda_vnops.c revision 1.63.2.2
1 /* $NetBSD: coda_vnops.c,v 1.63.2.2 2007/12/26 21:38:51 ad 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 1.63.2.2 2007/12/26 21:38:51 ad 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 /* locals */ 226 int error; 227 dev_t dev; /* container file device, inode, vnode */ 228 ino_t inode; 229 struct vnode *container_vp; 230 231 MARK_ENTRY(CODA_OPEN_STATS); 232 233 /* Check for open of control file. */ 234 if (IS_CTL_VP(vp)) { 235 /* if (WRITABLE(flag)) */ 236 if (flag & (FWRITE | O_TRUNC | O_CREAT | O_EXCL)) { 237 MARK_INT_FAIL(CODA_OPEN_STATS); 238 return(EACCES); 239 } 240 MARK_INT_SAT(CODA_OPEN_STATS); 241 return(0); 242 } 243 244 error = venus_open(vtomi(vp), &cp->c_fid, flag, cred, curlwp, &dev, &inode); 245 if (error) 246 return (error); 247 if (!error) { 248 CODADEBUG(CODA_OPEN, myprintf(("open: dev %d inode %llu result %d\n", 249 dev, (unsigned long long)inode, error)); ) 250 } 251 252 /* 253 * Obtain locked and referenced container vnode from container 254 * device/inode. 255 */ 256 error = coda_grab_vnode(dev, inode, &container_vp); 257 if (error) 258 return (error); 259 260 /* Save the vnode pointer for the container file. */ 261 if (cp->c_ovp == NULL) { 262 cp->c_ovp = container_vp; 263 } else { 264 if (cp->c_ovp != container_vp) 265 /* 266 * Perhaps venus returned a different container, or 267 * something else went wrong. 268 */ 269 panic("coda_open: cp->c_ovp != container_vp"); 270 } 271 cp->c_ocount++; 272 273 /* Flush the attribute cache if writing the file. */ 274 if (flag & FWRITE) { 275 cp->c_owrite++; 276 cp->c_flags &= ~C_VATTR; 277 } 278 279 /* 280 * Save the <device, inode> pair for the container file to speed 281 * up subsequent reads while closed (mmap, program execution). 282 * This is perhaps safe because venus will invalidate the node 283 * before changing the container file mapping. 284 */ 285 cp->c_device = dev; 286 cp->c_inode = inode; 287 288 /* Open the container file. */ 289 error = VOP_OPEN(container_vp, flag, cred); 290 /* 291 * Drop the lock on the container, after we have done VOP_OPEN 292 * (which requires a locked vnode). 293 */ 294 VOP_UNLOCK(container_vp, 0); 295 return(error); 296 } 297 298 /* 299 * Close the cache file used for I/O and notify Venus. 300 */ 301 int 302 coda_close(void *v) 303 { 304 /* true args */ 305 struct vop_close_args *ap = v; 306 struct vnode *vp = ap->a_vp; 307 struct cnode *cp = VTOC(vp); 308 int flag = ap->a_fflag; 309 kauth_cred_t cred = ap->a_cred; 310 /* locals */ 311 int error; 312 313 MARK_ENTRY(CODA_CLOSE_STATS); 314 315 /* Check for close of control file. */ 316 if (IS_CTL_VP(vp)) { 317 MARK_INT_SAT(CODA_CLOSE_STATS); 318 return(0); 319 } 320 321 /* 322 * XXX The IS_UNMOUNTING part of this is very suspect. 323 */ 324 if (IS_UNMOUNTING(cp)) { 325 if (cp->c_ovp) { 326 #ifdef CODA_VERBOSE 327 printf("coda_close: destroying container ref %d, ufs vp %p of vp %p/cp %p\n", 328 vp->v_usecount, cp->c_ovp, vp, cp); 329 #endif 330 #ifdef hmm 331 vgone(cp->c_ovp); 332 #else 333 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 334 VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ 335 vput(cp->c_ovp); 336 #endif 337 } else { 338 #ifdef CODA_VERBOSE 339 printf("coda_close: NO container vp %p/cp %p\n", vp, cp); 340 #endif 341 } 342 return ENODEV; 343 } 344 345 /* Lock the container node, and VOP_CLOSE it. */ 346 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 347 VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ 348 /* 349 * Drop the lock we just obtained, and vrele the container vnode. 350 * Decrement reference counts, and clear container vnode pointer on 351 * last close. 352 */ 353 vput(cp->c_ovp); 354 if (flag & FWRITE) 355 --cp->c_owrite; 356 if (--cp->c_ocount == 0) 357 cp->c_ovp = NULL; 358 359 error = venus_close(vtomi(vp), &cp->c_fid, flag, cred, curlwp); 360 361 CODADEBUG(CODA_CLOSE, myprintf(("close: result %d\n",error)); ) 362 return(error); 363 } 364 365 int 366 coda_read(void *v) 367 { 368 struct vop_read_args *ap = v; 369 370 ENTRY; 371 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_READ, 372 ap->a_ioflag, ap->a_cred, curlwp)); 373 } 374 375 int 376 coda_write(void *v) 377 { 378 struct vop_write_args *ap = v; 379 380 ENTRY; 381 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_WRITE, 382 ap->a_ioflag, ap->a_cred, curlwp)); 383 } 384 385 int 386 coda_rdwr(struct vnode *vp, struct uio *uiop, enum uio_rw rw, int ioflag, 387 kauth_cred_t cred, struct lwp *l) 388 { 389 /* upcall decl */ 390 /* NOTE: container file operation!!! */ 391 /* locals */ 392 struct cnode *cp = VTOC(vp); 393 struct vnode *cfvp = cp->c_ovp; 394 struct proc *p = l->l_proc; 395 int opened_internally = 0; 396 int error = 0; 397 398 MARK_ENTRY(CODA_RDWR_STATS); 399 400 CODADEBUG(CODA_RDWR, myprintf(("coda_rdwr(%d, %p, %lu, %lld)\n", rw, 401 uiop->uio_iov->iov_base, 402 (unsigned long) uiop->uio_resid, 403 (long long) uiop->uio_offset)); ) 404 405 /* Check for rdwr of control object. */ 406 if (IS_CTL_VP(vp)) { 407 MARK_INT_FAIL(CODA_RDWR_STATS); 408 return(EINVAL); 409 } 410 411 /* Redirect the request to UFS. */ 412 413 /* 414 * If file is not already open this must be a page 415 * {read,write} request. Iget the cache file's inode 416 * pointer if we still have its <device, inode> pair. 417 * Otherwise, we must do an internal open to derive the 418 * pair. 419 * XXX Integrate this into a coherent strategy for container 420 * file acquisition. 421 */ 422 if (cfvp == NULL) { 423 /* 424 * If we're dumping core, do the internal open. Otherwise 425 * venus won't have the correct size of the core when 426 * it's completely written. 427 */ 428 if (cp->c_inode != 0 && !(p && (p->p_acflag & ACORE))) { 429 printf("coda_rdwr: grabbing container vnode, losing reference\n"); 430 /* Get locked and refed vnode. */ 431 error = coda_grab_vnode(cp->c_device, cp->c_inode, &cfvp); 432 if (error) { 433 MARK_INT_FAIL(CODA_RDWR_STATS); 434 return(error); 435 } 436 /* 437 * Drop lock. 438 * XXX Where is reference released. 439 */ 440 VOP_UNLOCK(cfvp, 0); 441 } 442 else { 443 printf("coda_rdwr: internal VOP_OPEN\n"); 444 opened_internally = 1; 445 MARK_INT_GEN(CODA_OPEN_STATS); 446 error = VOP_OPEN(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); 447 #ifdef CODA_VERBOSE 448 printf("coda_rdwr: Internally Opening %p\n", vp); 449 #endif 450 if (error) { 451 MARK_INT_FAIL(CODA_RDWR_STATS); 452 return(error); 453 } 454 cfvp = cp->c_ovp; 455 } 456 } 457 458 /* Have UFS handle the call. */ 459 CODADEBUG(CODA_RDWR, myprintf(("indirect rdwr: fid = %s, refcnt = %d\n", 460 coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount)); ) 461 462 if (rw == UIO_READ) { 463 error = VOP_READ(cfvp, uiop, ioflag, cred); 464 } else { 465 error = VOP_WRITE(cfvp, uiop, ioflag, cred); 466 } 467 468 if (error) 469 MARK_INT_FAIL(CODA_RDWR_STATS); 470 else 471 MARK_INT_SAT(CODA_RDWR_STATS); 472 473 /* Do an internal close if necessary. */ 474 if (opened_internally) { 475 MARK_INT_GEN(CODA_CLOSE_STATS); 476 (void)VOP_CLOSE(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); 477 } 478 479 /* Invalidate cached attributes if writing. */ 480 if (rw == UIO_WRITE) 481 cp->c_flags &= ~C_VATTR; 482 return(error); 483 } 484 485 int 486 coda_ioctl(void *v) 487 { 488 /* true args */ 489 struct vop_ioctl_args *ap = v; 490 struct vnode *vp = ap->a_vp; 491 int com = ap->a_command; 492 void *data = ap->a_data; 493 int flag = ap->a_fflag; 494 kauth_cred_t cred = ap->a_cred; 495 /* locals */ 496 int error; 497 struct vnode *tvp; 498 struct nameidata ndp; 499 struct PioctlData *iap = (struct PioctlData *)data; 500 501 MARK_ENTRY(CODA_IOCTL_STATS); 502 503 CODADEBUG(CODA_IOCTL, myprintf(("in coda_ioctl on %s\n", iap->path));) 504 505 /* Don't check for operation on a dying object, for ctlvp it 506 shouldn't matter */ 507 508 /* Must be control object to succeed. */ 509 if (!IS_CTL_VP(vp)) { 510 MARK_INT_FAIL(CODA_IOCTL_STATS); 511 CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: vp != ctlvp"));) 512 return (EOPNOTSUPP); 513 } 514 /* Look up the pathname. */ 515 516 /* Should we use the name cache here? It would get it from 517 lookupname sooner or later anyway, right? */ 518 519 NDINIT(&ndp, LOOKUP, (iap->follow ? FOLLOW : NOFOLLOW), UIO_USERSPACE, 520 iap->path); 521 error = namei(&ndp); 522 tvp = ndp.ni_vp; 523 524 if (error) { 525 MARK_INT_FAIL(CODA_IOCTL_STATS); 526 CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: lookup returns %d\n", 527 error));) 528 return(error); 529 } 530 531 /* 532 * Make sure this is a coda style cnode, but it may be a 533 * different vfsp 534 */ 535 /* XXX: this totally violates the comment about vtagtype in vnode.h */ 536 if (tvp->v_tag != VT_CODA) { 537 vrele(tvp); 538 MARK_INT_FAIL(CODA_IOCTL_STATS); 539 CODADEBUG(CODA_IOCTL, 540 myprintf(("coda_ioctl error: %s not a coda object\n", 541 iap->path));) 542 return(EINVAL); 543 } 544 545 if (iap->vi.in_size > VC_MAXDATASIZE) { 546 vrele(tvp); 547 return(EINVAL); 548 } 549 error = venus_ioctl(vtomi(tvp), &((VTOC(tvp))->c_fid), com, flag, data, 550 cred, curlwp); 551 552 if (error) 553 MARK_INT_FAIL(CODA_IOCTL_STATS); 554 else 555 CODADEBUG(CODA_IOCTL, myprintf(("Ioctl returns %d \n", error)); ) 556 557 vrele(tvp); 558 return(error); 559 } 560 561 /* 562 * To reduce the cost of a user-level venus;we cache attributes in 563 * the kernel. Each cnode has storage allocated for an attribute. If 564 * c_vattr is valid, return a reference to it. Otherwise, get the 565 * attributes from venus and store them in the cnode. There is some 566 * question if this method is a security leak. But I think that in 567 * order to make this call, the user must have done a lookup and 568 * opened the file, and therefore should already have access. 569 */ 570 int 571 coda_getattr(void *v) 572 { 573 /* true args */ 574 struct vop_getattr_args *ap = v; 575 struct vnode *vp = ap->a_vp; 576 struct cnode *cp = VTOC(vp); 577 struct vattr *vap = ap->a_vap; 578 kauth_cred_t cred = ap->a_cred; 579 /* locals */ 580 int error; 581 582 MARK_ENTRY(CODA_GETATTR_STATS); 583 584 /* Check for getattr of control object. */ 585 if (IS_CTL_VP(vp)) { 586 MARK_INT_FAIL(CODA_GETATTR_STATS); 587 return(ENOENT); 588 } 589 590 /* Check to see if the attributes have already been cached */ 591 if (VALID_VATTR(cp)) { 592 CODADEBUG(CODA_GETATTR, { myprintf(("attr cache hit: %s\n", 593 coda_f2s(&cp->c_fid)));}); 594 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 595 print_vattr(&cp->c_vattr); ); 596 597 *vap = cp->c_vattr; 598 MARK_INT_SAT(CODA_GETATTR_STATS); 599 return(0); 600 } 601 602 error = venus_getattr(vtomi(vp), &cp->c_fid, cred, curlwp, vap); 603 604 if (!error) { 605 CODADEBUG(CODA_GETATTR, myprintf(("getattr miss %s: result %d\n", 606 coda_f2s(&cp->c_fid), error)); ) 607 608 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 609 print_vattr(vap); ); 610 611 /* If not open for write, store attributes in cnode */ 612 if ((cp->c_owrite == 0) && (coda_attr_cache)) { 613 cp->c_vattr = *vap; 614 cp->c_flags |= C_VATTR; 615 } 616 617 } 618 return(error); 619 } 620 621 int 622 coda_setattr(void *v) 623 { 624 /* true args */ 625 struct vop_setattr_args *ap = v; 626 struct vnode *vp = ap->a_vp; 627 struct cnode *cp = VTOC(vp); 628 struct vattr *vap = ap->a_vap; 629 kauth_cred_t cred = ap->a_cred; 630 /* locals */ 631 int error; 632 633 MARK_ENTRY(CODA_SETATTR_STATS); 634 635 /* Check for setattr of control object. */ 636 if (IS_CTL_VP(vp)) { 637 MARK_INT_FAIL(CODA_SETATTR_STATS); 638 return(ENOENT); 639 } 640 641 if (codadebug & CODADBGMSK(CODA_SETATTR)) { 642 print_vattr(vap); 643 } 644 error = venus_setattr(vtomi(vp), &cp->c_fid, vap, cred, curlwp); 645 646 if (!error) 647 cp->c_flags &= ~C_VATTR; 648 649 CODADEBUG(CODA_SETATTR, myprintf(("setattr %d\n", error)); ) 650 return(error); 651 } 652 653 int 654 coda_access(void *v) 655 { 656 /* true args */ 657 struct vop_access_args *ap = v; 658 struct vnode *vp = ap->a_vp; 659 struct cnode *cp = VTOC(vp); 660 int mode = ap->a_mode; 661 kauth_cred_t cred = ap->a_cred; 662 /* locals */ 663 int error; 664 665 MARK_ENTRY(CODA_ACCESS_STATS); 666 667 /* Check for access of control object. Only read access is 668 allowed on it. */ 669 if (IS_CTL_VP(vp)) { 670 /* bogus hack - all will be marked as successes */ 671 MARK_INT_SAT(CODA_ACCESS_STATS); 672 return(((mode & VREAD) && !(mode & (VWRITE | VEXEC))) 673 ? 0 : EACCES); 674 } 675 676 /* 677 * if the file is a directory, and we are checking exec (eg lookup) 678 * access, and the file is in the namecache, then the user must have 679 * lookup access to it. 680 */ 681 if (coda_access_cache) { 682 if ((vp->v_type == VDIR) && (mode & VEXEC)) { 683 if (coda_nc_lookup(cp, ".", 1, cred)) { 684 MARK_INT_SAT(CODA_ACCESS_STATS); 685 return(0); /* it was in the cache */ 686 } 687 } 688 } 689 690 error = venus_access(vtomi(vp), &cp->c_fid, mode, cred, curlwp); 691 692 return(error); 693 } 694 695 /* 696 * CODA abort op, called after namei() when a CREATE/DELETE isn't actually 697 * done. If a buffer has been saved in anticipation of a coda_create or 698 * a coda_remove, delete it. 699 */ 700 /* ARGSUSED */ 701 int 702 coda_abortop(void *v) 703 { 704 /* true args */ 705 struct vop_abortop_args /* { 706 struct vnode *a_dvp; 707 struct componentname *a_cnp; 708 } */ *ap = v; 709 /* upcall decl */ 710 /* locals */ 711 712 if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF) 713 PNBUF_PUT(ap->a_cnp->cn_pnbuf); 714 return (0); 715 } 716 717 int 718 coda_readlink(void *v) 719 { 720 /* true args */ 721 struct vop_readlink_args *ap = v; 722 struct vnode *vp = ap->a_vp; 723 struct cnode *cp = VTOC(vp); 724 struct uio *uiop = ap->a_uio; 725 kauth_cred_t cred = ap->a_cred; 726 /* locals */ 727 struct lwp *l = curlwp; 728 int error; 729 char *str; 730 int len; 731 732 MARK_ENTRY(CODA_READLINK_STATS); 733 734 /* Check for readlink of control object. */ 735 if (IS_CTL_VP(vp)) { 736 MARK_INT_FAIL(CODA_READLINK_STATS); 737 return(ENOENT); 738 } 739 740 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { /* symlink was cached */ 741 uiop->uio_rw = UIO_READ; 742 error = uiomove(cp->c_symlink, (int)cp->c_symlen, uiop); 743 if (error) 744 MARK_INT_FAIL(CODA_READLINK_STATS); 745 else 746 MARK_INT_SAT(CODA_READLINK_STATS); 747 return(error); 748 } 749 750 error = venus_readlink(vtomi(vp), &cp->c_fid, cred, l, &str, &len); 751 752 if (!error) { 753 uiop->uio_rw = UIO_READ; 754 error = uiomove(str, len, uiop); 755 756 if (coda_symlink_cache) { 757 cp->c_symlink = str; 758 cp->c_symlen = len; 759 cp->c_flags |= C_SYMLINK; 760 } else 761 CODA_FREE(str, len); 762 } 763 764 CODADEBUG(CODA_READLINK, myprintf(("in readlink result %d\n",error));) 765 return(error); 766 } 767 768 int 769 coda_fsync(void *v) 770 { 771 /* true args */ 772 struct vop_fsync_args *ap = v; 773 struct vnode *vp = ap->a_vp; 774 struct cnode *cp = VTOC(vp); 775 kauth_cred_t cred = ap->a_cred; 776 /* locals */ 777 struct vnode *convp = cp->c_ovp; 778 int error; 779 780 MARK_ENTRY(CODA_FSYNC_STATS); 781 782 /* Check for fsync on an unmounting object */ 783 /* The NetBSD kernel, in it's infinite wisdom, can try to fsync 784 * after an unmount has been initiated. This is a Bad Thing, 785 * which we have to avoid. Not a legitimate failure for stats. 786 */ 787 if (IS_UNMOUNTING(cp)) { 788 return(ENODEV); 789 } 790 791 /* Check for fsync of control object. */ 792 if (IS_CTL_VP(vp)) { 793 MARK_INT_SAT(CODA_FSYNC_STATS); 794 return(0); 795 } 796 797 if (convp) 798 VOP_FSYNC(convp, cred, MNT_WAIT, 0, 0); 799 800 /* 801 * We can expect fsync on any vnode at all if venus is pruging it. 802 * Venus can't very well answer the fsync request, now can it? 803 * Hopefully, it won't have to, because hopefully, venus preserves 804 * the (possibly untrue) invariant that it never purges an open 805 * vnode. Hopefully. 806 */ 807 if (cp->c_flags & C_PURGING) { 808 return(0); 809 } 810 811 error = venus_fsync(vtomi(vp), &cp->c_fid, cred, curlwp); 812 813 CODADEBUG(CODA_FSYNC, myprintf(("in fsync result %d\n",error)); ); 814 return(error); 815 } 816 817 /* 818 * vp is locked on entry, and we must unlock it. 819 * XXX This routine is suspect and probably needs rewriting. 820 */ 821 int 822 coda_inactive(void *v) 823 { 824 /* true args */ 825 struct vop_inactive_args *ap = v; 826 struct vnode *vp = ap->a_vp; 827 struct cnode *cp = VTOC(vp); 828 kauth_cred_t cred __unused = NULL; 829 830 /* We don't need to send inactive to venus - DCS */ 831 MARK_ENTRY(CODA_INACTIVE_STATS); 832 833 if (IS_CTL_VP(vp)) { 834 MARK_INT_SAT(CODA_INACTIVE_STATS); 835 return 0; 836 } 837 838 CODADEBUG(CODA_INACTIVE, myprintf(("in inactive, %s, vfsp %p\n", 839 coda_f2s(&cp->c_fid), vp->v_mount));) 840 841 /* If an array has been allocated to hold the symlink, deallocate it */ 842 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { 843 if (cp->c_symlink == NULL) 844 panic("coda_inactive: null symlink pointer in cnode"); 845 846 CODA_FREE(cp->c_symlink, cp->c_symlen); 847 cp->c_flags &= ~C_SYMLINK; 848 cp->c_symlen = 0; 849 } 850 851 /* Remove it from the table so it can't be found. */ 852 coda_unsave(cp); 853 if (vp->v_mount->mnt_data == NULL) { 854 myprintf(("Help! vfsp->vfs_data was NULL, but vnode %p wasn't dying\n", vp)); 855 panic("badness in coda_inactive"); 856 } 857 858 if (IS_UNMOUNTING(cp)) { 859 /* XXX Do we need to VOP_CLOSE container vnodes? */ 860 if (vp->v_usecount > 0) 861 printf("coda_inactive: IS_UNMOUNTING %p usecount %d\n", 862 vp, vp->v_usecount); 863 if (cp->c_ovp != NULL) 864 printf("coda_inactive: %p ovp != NULL\n", vp); 865 VOP_UNLOCK(vp, 0); 866 } else { 867 /* Sanity checks that perhaps should be panic. */ 868 if (vp->v_usecount) { 869 printf("coda_inactive: %p usecount %d\n", vp, vp->v_usecount); 870 } 871 if (cp->c_ovp != NULL) { 872 printf("coda_inactive: %p ovp != NULL\n", vp); 873 } 874 VOP_UNLOCK(vp, 0); 875 *ap->a_recycle = true; 876 } 877 878 MARK_INT_SAT(CODA_INACTIVE_STATS); 879 return(0); 880 } 881 882 /* 883 * Coda does not use the normal namecache, but a private version. 884 * Consider how to use the standard facility instead. 885 */ 886 int 887 coda_lookup(void *v) 888 { 889 /* true args */ 890 struct vop_lookup_args *ap = v; 891 /* (locked) vnode of dir in which to do lookup */ 892 struct vnode *dvp = ap->a_dvp; 893 struct cnode *dcp = VTOC(dvp); 894 /* output variable for result */ 895 struct vnode **vpp = ap->a_vpp; 896 /* name to lookup */ 897 struct componentname *cnp = ap->a_cnp; 898 kauth_cred_t cred = cnp->cn_cred; 899 struct lwp *l = curlwp; 900 /* locals */ 901 struct cnode *cp; 902 const char *nm = cnp->cn_nameptr; 903 int len = cnp->cn_namelen; 904 int flags = cnp->cn_flags; 905 int isdot; 906 CodaFid VFid; 907 int vtype; 908 int error = 0; 909 910 MARK_ENTRY(CODA_LOOKUP_STATS); 911 912 CODADEBUG(CODA_LOOKUP, myprintf(("lookup: %s in %s\n", 913 nm, coda_f2s(&dcp->c_fid)));); 914 915 /* 916 * XXX componentname flags in MODMASK are not handled at all 917 */ 918 919 /* 920 * The overall strategy is to switch on the lookup type and get a 921 * result vnode that is vref'd but not locked. Then, the code at 922 * exit: switches on ., .., and regular lookups and does the right 923 * locking. 924 */ 925 926 /* Check for lookup of control object. */ 927 if (IS_CTL_NAME(dvp, nm, len)) { 928 *vpp = coda_ctlvp; 929 vref(*vpp); 930 MARK_INT_SAT(CODA_LOOKUP_STATS); 931 goto exit; 932 } 933 934 /* Avoid trying to hand venus an unreasonably long name. */ 935 if (len+1 > CODA_MAXNAMLEN) { 936 MARK_INT_FAIL(CODA_LOOKUP_STATS); 937 CODADEBUG(CODA_LOOKUP, myprintf(("name too long: lookup, %s (%s)\n", 938 coda_f2s(&dcp->c_fid), nm));); 939 *vpp = (struct vnode *)0; 940 error = EINVAL; 941 goto exit; 942 } 943 944 /* 945 * XXX Check for DOT lookups, and short circuit all the caches, 946 * just doing an extra vref. (venus guarantees that lookup of 947 * . returns self.) 948 */ 949 isdot = (len == 1 && nm[0] == '.'); 950 951 /* 952 * Try to resolve the lookup in the minicache. If that fails, ask 953 * venus to do the lookup. XXX The interaction between vnode 954 * locking and any locking that coda does is not clear. 955 */ 956 cp = coda_nc_lookup(dcp, nm, len, cred); 957 if (cp) { 958 *vpp = CTOV(cp); 959 vref(*vpp); 960 CODADEBUG(CODA_LOOKUP, 961 myprintf(("lookup result %d vpp %p\n",error,*vpp));) 962 } else { 963 /* The name wasn't cached, so ask Venus. */ 964 error = venus_lookup(vtomi(dvp), &dcp->c_fid, nm, len, cred, l, &VFid, &vtype); 965 966 if (error) { 967 MARK_INT_FAIL(CODA_LOOKUP_STATS); 968 CODADEBUG(CODA_LOOKUP, myprintf(("lookup error on %s (%s)%d\n", 969 coda_f2s(&dcp->c_fid), nm, error));) 970 *vpp = (struct vnode *)0; 971 } else { 972 MARK_INT_SAT(CODA_LOOKUP_STATS); 973 CODADEBUG(CODA_LOOKUP, 974 myprintf(("lookup: %s type %o result %d\n", 975 coda_f2s(&VFid), vtype, error)); ) 976 977 cp = make_coda_node(&VFid, dvp->v_mount, vtype); 978 *vpp = CTOV(cp); 979 /* vpp is now vrefed. */ 980 981 /* 982 * Unless this vnode is marked CODA_NOCACHE, enter it into 983 * the coda name cache to avoid a future venus round-trip. 984 * XXX Interaction with componentname NOCACHE is unclear. 985 */ 986 if (!(vtype & CODA_NOCACHE)) 987 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 988 } 989 } 990 991 exit: 992 /* 993 * If we are creating, and this was the last name to be looked up, 994 * and the error was ENOENT, then make the leaf NULL and return 995 * success. 996 * XXX Check against new lookup rules. 997 */ 998 if (((cnp->cn_nameiop == CREATE) || (cnp->cn_nameiop == RENAME)) 999 && (cnp->cn_flags & ISLASTCN) 1000 && (error == ENOENT)) 1001 { 1002 error = EJUSTRETURN; 1003 cnp->cn_flags |= SAVENAME; 1004 *ap->a_vpp = NULL; 1005 } 1006 1007 /* 1008 * If we are removing, and we are at the last element, and we 1009 * found it, then we need to keep the name around so that the 1010 * removal will go ahead as planned. 1011 * XXX Check against new lookup rules. 1012 */ 1013 if ((cnp->cn_nameiop == DELETE) 1014 && (cnp->cn_flags & ISLASTCN) 1015 && !error) 1016 { 1017 cnp->cn_flags |= SAVENAME; 1018 } 1019 1020 /* 1021 * If the lookup succeeded, we must generally lock the returned 1022 * vnode. This could be a ., .., or normal lookup. See 1023 * vnodeops(9) for the details. 1024 */ 1025 /* 1026 * XXX LK_RETRY is likely incorrect. Handle vn_lock failure 1027 * somehow, and remove LK_RETRY. 1028 */ 1029 if (!error || (error == EJUSTRETURN)) { 1030 /* Lookup has a value and it isn't "."? */ 1031 if (*ap->a_vpp && (*ap->a_vpp != dvp)) { 1032 if (flags & ISDOTDOT) 1033 /* ..: unlock parent */ 1034 VOP_UNLOCK(dvp, 0); 1035 /* all but .: lock child */ 1036 vn_lock(*ap->a_vpp, LK_EXCLUSIVE | LK_RETRY); 1037 if (flags & ISDOTDOT) 1038 /* ..: relock parent */ 1039 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1040 } 1041 /* else .: leave dvp locked */ 1042 } else { 1043 /* The lookup failed, so return NULL. Leave dvp locked. */ 1044 *ap->a_vpp = NULL; 1045 } 1046 return(error); 1047 } 1048 1049 /*ARGSUSED*/ 1050 int 1051 coda_create(void *v) 1052 { 1053 /* true args */ 1054 struct vop_create_args *ap = v; 1055 struct vnode *dvp = ap->a_dvp; 1056 struct cnode *dcp = VTOC(dvp); 1057 struct vattr *va = ap->a_vap; 1058 int exclusive = 1; 1059 int mode = ap->a_vap->va_mode; 1060 struct vnode **vpp = ap->a_vpp; 1061 struct componentname *cnp = ap->a_cnp; 1062 kauth_cred_t cred = cnp->cn_cred; 1063 struct lwp *l = curlwp; 1064 /* locals */ 1065 int error; 1066 struct cnode *cp; 1067 const char *nm = cnp->cn_nameptr; 1068 int len = cnp->cn_namelen; 1069 CodaFid VFid; 1070 struct vattr attr; 1071 1072 MARK_ENTRY(CODA_CREATE_STATS); 1073 1074 /* All creates are exclusive XXX */ 1075 /* I'm assuming the 'mode' argument is the file mode bits XXX */ 1076 1077 /* Check for create of control object. */ 1078 if (IS_CTL_NAME(dvp, nm, len)) { 1079 *vpp = (struct vnode *)0; 1080 MARK_INT_FAIL(CODA_CREATE_STATS); 1081 return(EACCES); 1082 } 1083 1084 error = venus_create(vtomi(dvp), &dcp->c_fid, nm, len, exclusive, mode, va, cred, l, &VFid, &attr); 1085 1086 if (!error) { 1087 1088 /* 1089 * XXX Violation of venus/kernel invariants is a difficult case, 1090 * but venus should not be able to cause a panic. 1091 */ 1092 /* If this is an exclusive create, panic if the file already exists. */ 1093 /* Venus should have detected the file and reported EEXIST. */ 1094 1095 if ((exclusive == 1) && 1096 (coda_find(&VFid) != NULL)) 1097 panic("cnode existed for newly created file!"); 1098 1099 cp = make_coda_node(&VFid, dvp->v_mount, attr.va_type); 1100 *vpp = CTOV(cp); 1101 1102 /* XXX vnodeops doesn't say this argument can be changed. */ 1103 /* Update va to reflect the new attributes. */ 1104 (*va) = attr; 1105 1106 /* Update the attribute cache and mark it as valid */ 1107 if (coda_attr_cache) { 1108 VTOC(*vpp)->c_vattr = attr; 1109 VTOC(*vpp)->c_flags |= C_VATTR; 1110 } 1111 1112 /* Invalidate parent's attr cache (modification time has changed). */ 1113 VTOC(dvp)->c_flags &= ~C_VATTR; 1114 1115 /* enter the new vnode in the Name Cache */ 1116 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1117 1118 CODADEBUG(CODA_CREATE, 1119 myprintf(("create: %s, result %d\n", 1120 coda_f2s(&VFid), error)); ) 1121 } else { 1122 *vpp = (struct vnode *)0; 1123 CODADEBUG(CODA_CREATE, myprintf(("create error %d\n", error));) 1124 } 1125 1126 /* 1127 * vnodeops(9) says that we must unlock the parent and lock the child. 1128 * XXX Should we lock the child first? 1129 */ 1130 vput(dvp); 1131 if (!error) { 1132 if ((cnp->cn_flags & LOCKLEAF) == 0) { 1133 /* This should not happen; flags are for lookup only. */ 1134 printf("coda_create: LOCKLEAF not set!\n"); 1135 } 1136 1137 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { 1138 /* XXX Perhaps avoid this panic. */ 1139 panic("coda_create: couldn't lock child"); 1140 } 1141 } 1142 1143 /* Per vnodeops(9), free name except on success and SAVESTART. */ 1144 if (error || (cnp->cn_flags & SAVESTART) == 0) { 1145 PNBUF_PUT(cnp->cn_pnbuf); 1146 } 1147 return(error); 1148 } 1149 1150 int 1151 coda_remove(void *v) 1152 { 1153 /* true args */ 1154 struct vop_remove_args *ap = v; 1155 struct vnode *dvp = ap->a_dvp; 1156 struct cnode *cp = VTOC(dvp); 1157 struct vnode *vp = ap->a_vp; 1158 struct componentname *cnp = ap->a_cnp; 1159 kauth_cred_t cred = cnp->cn_cred; 1160 struct lwp *l = curlwp; 1161 /* locals */ 1162 int error; 1163 const char *nm = cnp->cn_nameptr; 1164 int len = cnp->cn_namelen; 1165 struct cnode *tp; 1166 1167 MARK_ENTRY(CODA_REMOVE_STATS); 1168 1169 CODADEBUG(CODA_REMOVE, myprintf(("remove: %s in %s\n", 1170 nm, coda_f2s(&cp->c_fid)));); 1171 1172 /* Remove the file's entry from the CODA Name Cache */ 1173 /* We're being conservative here, it might be that this person 1174 * doesn't really have sufficient access to delete the file 1175 * but we feel zapping the entry won't really hurt anyone -- dcs 1176 */ 1177 /* I'm gonna go out on a limb here. If a file and a hardlink to it 1178 * exist, and one is removed, the link count on the other will be 1179 * off by 1. We could either invalidate the attrs if cached, or 1180 * fix them. I'll try to fix them. DCS 11/8/94 1181 */ 1182 tp = coda_nc_lookup(VTOC(dvp), nm, len, cred); 1183 if (tp) { 1184 if (VALID_VATTR(tp)) { /* If attrs are cached */ 1185 if (tp->c_vattr.va_nlink > 1) { /* If it's a hard link */ 1186 tp->c_vattr.va_nlink--; 1187 } 1188 } 1189 1190 coda_nc_zapfile(VTOC(dvp), nm, len); 1191 /* No need to flush it if it doesn't exist! */ 1192 } 1193 /* Invalidate the parent's attr cache, the modification time has changed */ 1194 VTOC(dvp)->c_flags &= ~C_VATTR; 1195 1196 /* Check for remove of control object. */ 1197 if (IS_CTL_NAME(dvp, nm, len)) { 1198 MARK_INT_FAIL(CODA_REMOVE_STATS); 1199 return(ENOENT); 1200 } 1201 1202 error = venus_remove(vtomi(dvp), &cp->c_fid, nm, len, cred, l); 1203 1204 CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n",error)); ) 1205 1206 /* 1207 * Unlock parent and child (avoiding double if "."). 1208 */ 1209 if (dvp == vp) { 1210 vrele(vp); 1211 } else { 1212 vput(vp); 1213 } 1214 vput(dvp); 1215 1216 return(error); 1217 } 1218 1219 /* 1220 * dvp is the directory where the link is to go, and is locked. 1221 * vp is the object to be linked to, and is unlocked. 1222 * At exit, we must unlock dvp, and vput dvp. 1223 */ 1224 int 1225 coda_link(void *v) 1226 { 1227 /* true args */ 1228 struct vop_link_args *ap = v; 1229 struct vnode *vp = ap->a_vp; 1230 struct cnode *cp = VTOC(vp); 1231 struct vnode *dvp = ap->a_dvp; 1232 struct cnode *dcp = VTOC(dvp); 1233 struct componentname *cnp = ap->a_cnp; 1234 kauth_cred_t cred = cnp->cn_cred; 1235 struct lwp *l = curlwp; 1236 /* locals */ 1237 int error; 1238 const char *nm = cnp->cn_nameptr; 1239 int len = cnp->cn_namelen; 1240 1241 MARK_ENTRY(CODA_LINK_STATS); 1242 1243 if (codadebug & CODADBGMSK(CODA_LINK)) { 1244 1245 myprintf(("nb_link: vp fid: %s\n", 1246 coda_f2s(&cp->c_fid))); 1247 myprintf(("nb_link: dvp fid: %s)\n", 1248 coda_f2s(&dcp->c_fid))); 1249 1250 } 1251 if (codadebug & CODADBGMSK(CODA_LINK)) { 1252 myprintf(("link: vp fid: %s\n", 1253 coda_f2s(&cp->c_fid))); 1254 myprintf(("link: dvp fid: %s\n", 1255 coda_f2s(&dcp->c_fid))); 1256 1257 } 1258 1259 /* Check for link to/from control object. */ 1260 if (IS_CTL_NAME(dvp, nm, len) || IS_CTL_VP(vp)) { 1261 MARK_INT_FAIL(CODA_LINK_STATS); 1262 return(EACCES); 1263 } 1264 1265 /* If linking . to a name, error out earlier. */ 1266 if (vp == dvp) { 1267 printf("coda_link vp==dvp\n"); 1268 error = EISDIR; 1269 goto exit; 1270 } 1271 1272 /* XXX Why does venus_link need the vnode to be locked?*/ 1273 if ((error = vn_lock(vp, LK_EXCLUSIVE)) != 0) { 1274 printf("coda_link: couldn't lock vnode %p\n", vp); 1275 error = EFAULT; /* XXX better value */ 1276 goto exit; 1277 } 1278 error = venus_link(vtomi(vp), &cp->c_fid, &dcp->c_fid, nm, len, cred, l); 1279 VOP_UNLOCK(vp, 0); 1280 1281 /* Invalidate parent's attr cache (the modification time has changed). */ 1282 VTOC(dvp)->c_flags &= ~C_VATTR; 1283 /* Invalidate child's attr cache (XXX why). */ 1284 VTOC(vp)->c_flags &= ~C_VATTR; 1285 1286 CODADEBUG(CODA_LINK, myprintf(("in link result %d\n",error)); ) 1287 1288 exit: 1289 vput(dvp); 1290 return(error); 1291 } 1292 1293 int 1294 coda_rename(void *v) 1295 { 1296 /* true args */ 1297 struct vop_rename_args *ap = v; 1298 struct vnode *odvp = ap->a_fdvp; 1299 struct cnode *odcp = VTOC(odvp); 1300 struct componentname *fcnp = ap->a_fcnp; 1301 struct vnode *ndvp = ap->a_tdvp; 1302 struct cnode *ndcp = VTOC(ndvp); 1303 struct componentname *tcnp = ap->a_tcnp; 1304 kauth_cred_t cred = fcnp->cn_cred; 1305 struct lwp *l = curlwp; 1306 /* true args */ 1307 int error; 1308 const char *fnm = fcnp->cn_nameptr; 1309 int flen = fcnp->cn_namelen; 1310 const char *tnm = tcnp->cn_nameptr; 1311 int tlen = tcnp->cn_namelen; 1312 1313 MARK_ENTRY(CODA_RENAME_STATS); 1314 1315 /* Hmmm. The vnodes are already looked up. Perhaps they are locked? 1316 This could be Bad. XXX */ 1317 #ifdef OLD_DIAGNOSTIC 1318 if ((fcnp->cn_cred != tcnp->cn_cred) 1319 || (fcnp->cn_lwp != tcnp->cn_lwp)) 1320 { 1321 panic("coda_rename: component names don't agree"); 1322 } 1323 #endif 1324 1325 /* Check for rename involving control object. */ 1326 if (IS_CTL_NAME(odvp, fnm, flen) || IS_CTL_NAME(ndvp, tnm, tlen)) { 1327 MARK_INT_FAIL(CODA_RENAME_STATS); 1328 return(EACCES); 1329 } 1330 1331 /* Problem with moving directories -- need to flush entry for .. */ 1332 if (odvp != ndvp) { 1333 struct cnode *ovcp = coda_nc_lookup(VTOC(odvp), fnm, flen, cred); 1334 if (ovcp) { 1335 struct vnode *ovp = CTOV(ovcp); 1336 if ((ovp) && 1337 (ovp->v_type == VDIR)) /* If it's a directory */ 1338 coda_nc_zapfile(VTOC(ovp),"..", 2); 1339 } 1340 } 1341 1342 /* Remove the entries for both source and target files */ 1343 coda_nc_zapfile(VTOC(odvp), fnm, flen); 1344 coda_nc_zapfile(VTOC(ndvp), tnm, tlen); 1345 1346 /* Invalidate the parent's attr cache, the modification time has changed */ 1347 VTOC(odvp)->c_flags &= ~C_VATTR; 1348 VTOC(ndvp)->c_flags &= ~C_VATTR; 1349 1350 if (flen+1 > CODA_MAXNAMLEN) { 1351 MARK_INT_FAIL(CODA_RENAME_STATS); 1352 error = EINVAL; 1353 goto exit; 1354 } 1355 1356 if (tlen+1 > CODA_MAXNAMLEN) { 1357 MARK_INT_FAIL(CODA_RENAME_STATS); 1358 error = EINVAL; 1359 goto exit; 1360 } 1361 1362 error = venus_rename(vtomi(odvp), &odcp->c_fid, &ndcp->c_fid, fnm, flen, tnm, tlen, cred, l); 1363 1364 exit: 1365 CODADEBUG(CODA_RENAME, myprintf(("in rename result %d\n",error));) 1366 /* XXX - do we need to call cache pureg on the moved vnode? */ 1367 cache_purge(ap->a_fvp); 1368 1369 /* It seems to be incumbent on us to drop locks on all four vnodes */ 1370 /* From-vnodes are not locked, only ref'd. To-vnodes are locked. */ 1371 1372 vrele(ap->a_fvp); 1373 vrele(odvp); 1374 1375 if (ap->a_tvp) { 1376 if (ap->a_tvp == ndvp) { 1377 vrele(ap->a_tvp); 1378 } else { 1379 vput(ap->a_tvp); 1380 } 1381 } 1382 1383 vput(ndvp); 1384 return(error); 1385 } 1386 1387 int 1388 coda_mkdir(void *v) 1389 { 1390 /* true args */ 1391 struct vop_mkdir_args *ap = v; 1392 struct vnode *dvp = ap->a_dvp; 1393 struct cnode *dcp = VTOC(dvp); 1394 struct componentname *cnp = ap->a_cnp; 1395 struct vattr *va = ap->a_vap; 1396 struct vnode **vpp = ap->a_vpp; 1397 kauth_cred_t cred = cnp->cn_cred; 1398 struct lwp *l = curlwp; 1399 /* locals */ 1400 int error; 1401 const char *nm = cnp->cn_nameptr; 1402 int len = cnp->cn_namelen; 1403 struct cnode *cp; 1404 CodaFid VFid; 1405 struct vattr ova; 1406 1407 MARK_ENTRY(CODA_MKDIR_STATS); 1408 1409 /* Check for mkdir of target object. */ 1410 if (IS_CTL_NAME(dvp, nm, len)) { 1411 *vpp = (struct vnode *)0; 1412 MARK_INT_FAIL(CODA_MKDIR_STATS); 1413 return(EACCES); 1414 } 1415 1416 if (len+1 > CODA_MAXNAMLEN) { 1417 *vpp = (struct vnode *)0; 1418 MARK_INT_FAIL(CODA_MKDIR_STATS); 1419 return(EACCES); 1420 } 1421 1422 error = venus_mkdir(vtomi(dvp), &dcp->c_fid, nm, len, va, cred, l, &VFid, &ova); 1423 1424 if (!error) { 1425 if (coda_find(&VFid) != NULL) 1426 panic("cnode existed for newly created directory!"); 1427 1428 1429 cp = make_coda_node(&VFid, dvp->v_mount, va->va_type); 1430 *vpp = CTOV(cp); 1431 1432 /* enter the new vnode in the Name Cache */ 1433 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1434 1435 /* as a side effect, enter "." and ".." for the directory */ 1436 coda_nc_enter(VTOC(*vpp), ".", 1, cred, VTOC(*vpp)); 1437 coda_nc_enter(VTOC(*vpp), "..", 2, cred, VTOC(dvp)); 1438 1439 if (coda_attr_cache) { 1440 VTOC(*vpp)->c_vattr = ova; /* update the attr cache */ 1441 VTOC(*vpp)->c_flags |= C_VATTR; /* Valid attributes in cnode */ 1442 } 1443 1444 /* Invalidate the parent's attr cache, the modification time has changed */ 1445 VTOC(dvp)->c_flags &= ~C_VATTR; 1446 1447 CODADEBUG( CODA_MKDIR, myprintf(("mkdir: %s result %d\n", 1448 coda_f2s(&VFid), error)); ) 1449 } else { 1450 *vpp = (struct vnode *)0; 1451 CODADEBUG(CODA_MKDIR, myprintf(("mkdir error %d\n",error));) 1452 } 1453 1454 /* 1455 * Currently, all mkdirs explicitly vput their dvp's. 1456 * It also appears that we *must* lock the vpp, since 1457 * lockleaf isn't set, but someone down the road is going 1458 * to try to unlock the new directory. 1459 */ 1460 vput(dvp); 1461 if (!error) { 1462 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { 1463 panic("coda_mkdir: couldn't lock child"); 1464 } 1465 } 1466 1467 /* Per vnodeops(9), free name except on success and SAVESTART. */ 1468 if (error || (cnp->cn_flags & SAVESTART) == 0) { 1469 PNBUF_PUT(cnp->cn_pnbuf); 1470 } 1471 return(error); 1472 } 1473 1474 int 1475 coda_rmdir(void *v) 1476 { 1477 /* true args */ 1478 struct vop_rmdir_args *ap = v; 1479 struct vnode *dvp = ap->a_dvp; 1480 struct cnode *dcp = VTOC(dvp); 1481 struct vnode *vp = ap->a_vp; 1482 struct componentname *cnp = ap->a_cnp; 1483 kauth_cred_t cred = cnp->cn_cred; 1484 struct lwp *l = curlwp; 1485 /* true args */ 1486 int error; 1487 const char *nm = cnp->cn_nameptr; 1488 int len = cnp->cn_namelen; 1489 struct cnode *cp; 1490 1491 MARK_ENTRY(CODA_RMDIR_STATS); 1492 1493 /* Check for rmdir of control object. */ 1494 if (IS_CTL_NAME(dvp, nm, len)) { 1495 MARK_INT_FAIL(CODA_RMDIR_STATS); 1496 return(ENOENT); 1497 } 1498 1499 /* Can't remove . in self. */ 1500 if (dvp == vp) { 1501 printf("coda_rmdir: dvp == vp\n"); 1502 error = EINVAL; 1503 goto exit; 1504 } 1505 1506 /* 1507 * The caller may not have adequate permissions, and the venus 1508 * operation may fail, but it doesn't hurt from a correctness 1509 * viewpoint to invalidate cache entries. 1510 * XXX Why isn't this done after the venus_rmdir call? 1511 */ 1512 /* Look up child in name cache (by name, from parent). */ 1513 cp = coda_nc_lookup(dcp, nm, len, cred); 1514 /* If found, remove all children of the child (., ..). */ 1515 if (cp) coda_nc_zapParentfid(&(cp->c_fid), NOT_DOWNCALL); 1516 1517 /* Remove child's own entry. */ 1518 coda_nc_zapfile(dcp, nm, len); 1519 1520 /* Invalidate parent's attr cache (the modification time has changed). */ 1521 dcp->c_flags &= ~C_VATTR; 1522 1523 error = venus_rmdir(vtomi(dvp), &dcp->c_fid, nm, len, cred, l); 1524 1525 CODADEBUG(CODA_RMDIR, myprintf(("in rmdir result %d\n", error)); ) 1526 1527 exit: 1528 /* vput both vnodes */ 1529 vput(dvp); 1530 if (dvp == vp) { 1531 vrele(vp); 1532 } else { 1533 vput(vp); 1534 } 1535 1536 return(error); 1537 } 1538 1539 int 1540 coda_symlink(void *v) 1541 { 1542 /* true args */ 1543 struct vop_symlink_args *ap = v; 1544 struct vnode *dvp = ap->a_dvp; 1545 struct cnode *dcp = VTOC(dvp); 1546 /* a_vpp is used in place below */ 1547 struct componentname *cnp = ap->a_cnp; 1548 struct vattr *tva = ap->a_vap; 1549 char *path = ap->a_target; 1550 kauth_cred_t cred = cnp->cn_cred; 1551 struct lwp *l = curlwp; 1552 /* locals */ 1553 int error; 1554 u_long saved_cn_flags; 1555 const char *nm = cnp->cn_nameptr; 1556 int len = cnp->cn_namelen; 1557 int plen = strlen(path); 1558 1559 /* 1560 * Here's the strategy for the moment: perform the symlink, then 1561 * do a lookup to grab the resulting vnode. I know this requires 1562 * two communications with Venus for a new sybolic link, but 1563 * that's the way the ball bounces. I don't yet want to change 1564 * the way the Mach symlink works. When Mach support is 1565 * deprecated, we should change symlink so that the common case 1566 * returns the resultant vnode in a vpp argument. 1567 */ 1568 1569 MARK_ENTRY(CODA_SYMLINK_STATS); 1570 1571 /* Check for symlink of control object. */ 1572 if (IS_CTL_NAME(dvp, nm, len)) { 1573 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1574 error = EACCES; 1575 goto exit; 1576 } 1577 1578 if (plen+1 > CODA_MAXPATHLEN) { 1579 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1580 error = EINVAL; 1581 goto exit; 1582 } 1583 1584 if (len+1 > CODA_MAXNAMLEN) { 1585 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1586 error = EINVAL; 1587 goto exit; 1588 } 1589 1590 error = venus_symlink(vtomi(dvp), &dcp->c_fid, path, plen, nm, len, tva, cred, l); 1591 1592 /* Invalidate the parent's attr cache (modification time has changed). */ 1593 dcp->c_flags &= ~C_VATTR; 1594 1595 if (!error) { 1596 /* 1597 * VOP_SYMLINK is not defined to pay attention to cnp->cn_flags; 1598 * these are defined only for VOP_LOOKUP. We desire to reuse 1599 * cnp for a VOP_LOOKUP operation, and must be sure to not pass 1600 * stray flags passed to us. Such stray flags can occur because 1601 * sys_symlink makes a namei call and then reuses the 1602 * componentname structure. 1603 */ 1604 /* 1605 * XXX Arguably we should create our own componentname structure 1606 * and not reuse the one that was passed in. 1607 */ 1608 saved_cn_flags = cnp->cn_flags; 1609 cnp->cn_flags &= ~(MODMASK | OPMASK); 1610 cnp->cn_flags |= LOOKUP; 1611 error = VOP_LOOKUP(dvp, ap->a_vpp, cnp); 1612 cnp->cn_flags = saved_cn_flags; 1613 /* Either an error occurs, or ap->a_vpp is locked. */ 1614 } 1615 1616 exit: 1617 /* unlock and deference parent */ 1618 vput(dvp); 1619 1620 /* Per vnodeops(9), free name except on success and SAVESTART. */ 1621 if (error || (cnp->cn_flags & SAVESTART) == 0) { 1622 PNBUF_PUT(cnp->cn_pnbuf); 1623 } 1624 1625 CODADEBUG(CODA_SYMLINK, myprintf(("in symlink result %d\n",error)); ) 1626 return(error); 1627 } 1628 1629 /* 1630 * Read directory entries. 1631 */ 1632 int 1633 coda_readdir(void *v) 1634 { 1635 /* true args */ 1636 struct vop_readdir_args *ap = v; 1637 struct vnode *vp = ap->a_vp; 1638 struct cnode *cp = VTOC(vp); 1639 struct uio *uiop = ap->a_uio; 1640 kauth_cred_t cred = ap->a_cred; 1641 int *eofflag = ap->a_eofflag; 1642 off_t **cookies = ap->a_cookies; 1643 int *ncookies = ap->a_ncookies; 1644 /* upcall decl */ 1645 /* locals */ 1646 int error = 0; 1647 1648 MARK_ENTRY(CODA_READDIR_STATS); 1649 1650 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)); ) 1651 1652 /* Check for readdir of control object. */ 1653 if (IS_CTL_VP(vp)) { 1654 MARK_INT_FAIL(CODA_READDIR_STATS); 1655 return(ENOENT); 1656 } 1657 1658 { 1659 /* Redirect the request to UFS. */ 1660 1661 /* If directory is not already open do an "internal open" on it. */ 1662 int opened_internally = 0; 1663 if (cp->c_ovp == NULL) { 1664 opened_internally = 1; 1665 MARK_INT_GEN(CODA_OPEN_STATS); 1666 error = VOP_OPEN(vp, FREAD, cred); 1667 #ifdef CODA_VERBOSE 1668 printf("coda_readdir: Internally Opening %p\n", vp); 1669 #endif 1670 if (error) return(error); 1671 } else 1672 vp = cp->c_ovp; 1673 1674 /* Have UFS handle the call. */ 1675 CODADEBUG(CODA_READDIR, myprintf(( 1676 "indirect readdir: fid = %s, refcnt = %d\n", 1677 coda_f2s(&cp->c_fid), vp->v_usecount)); ) 1678 error = VOP_READDIR(vp, uiop, cred, eofflag, cookies, ncookies); 1679 if (error) 1680 MARK_INT_FAIL(CODA_READDIR_STATS); 1681 else 1682 MARK_INT_SAT(CODA_READDIR_STATS); 1683 1684 /* Do an "internal close" if necessary. */ 1685 if (opened_internally) { 1686 MARK_INT_GEN(CODA_CLOSE_STATS); 1687 (void)VOP_CLOSE(vp, FREAD, cred); 1688 } 1689 } 1690 1691 return(error); 1692 } 1693 1694 /* 1695 * Convert from file system blocks to device blocks 1696 */ 1697 int 1698 coda_bmap(void *v) 1699 { 1700 /* XXX on the global proc */ 1701 /* true args */ 1702 struct vop_bmap_args *ap = v; 1703 struct vnode *vp __unused = ap->a_vp; /* file's vnode */ 1704 daddr_t bn __unused = ap->a_bn; /* fs block number */ 1705 struct vnode **vpp = ap->a_vpp; /* RETURN vp of device */ 1706 daddr_t *bnp __unused = ap->a_bnp; /* RETURN device block number */ 1707 struct lwp *l __unused = curlwp; 1708 /* upcall decl */ 1709 /* locals */ 1710 1711 *vpp = (struct vnode *)0; 1712 myprintf(("coda_bmap called!\n")); 1713 return(EINVAL); 1714 } 1715 1716 /* 1717 * I don't think the following two things are used anywhere, so I've 1718 * commented them out 1719 * 1720 * struct buf *async_bufhead; 1721 * int async_daemon_count; 1722 */ 1723 int 1724 coda_strategy(void *v) 1725 { 1726 /* true args */ 1727 struct vop_strategy_args *ap = v; 1728 struct buf *bp __unused = ap->a_bp; 1729 struct lwp *l __unused = curlwp; 1730 /* upcall decl */ 1731 /* locals */ 1732 1733 myprintf(("coda_strategy called! ")); 1734 return(EINVAL); 1735 } 1736 1737 int 1738 coda_reclaim(void *v) 1739 { 1740 /* true args */ 1741 struct vop_reclaim_args *ap = v; 1742 struct vnode *vp = ap->a_vp; 1743 struct cnode *cp = VTOC(vp); 1744 /* upcall decl */ 1745 /* locals */ 1746 1747 /* 1748 * Forced unmount/flush will let vnodes with non zero use be destroyed! 1749 */ 1750 ENTRY; 1751 1752 if (IS_UNMOUNTING(cp)) { 1753 #ifdef DEBUG 1754 if (VTOC(vp)->c_ovp) { 1755 if (IS_UNMOUNTING(cp)) 1756 printf("coda_reclaim: c_ovp not void: vp %p, cp %p\n", vp, cp); 1757 } 1758 #endif 1759 } else { 1760 #ifdef OLD_DIAGNOSTIC 1761 if (vp->v_usecount != 0) 1762 print("coda_reclaim: pushing active %p\n", vp); 1763 if (VTOC(vp)->c_ovp) { 1764 panic("coda_reclaim: c_ovp not void"); 1765 } 1766 #endif 1767 } 1768 cache_purge(vp); 1769 coda_free(VTOC(vp)); 1770 SET_VTOC(vp) = NULL; 1771 return (0); 1772 } 1773 1774 int 1775 coda_lock(void *v) 1776 { 1777 /* true args */ 1778 struct vop_lock_args *ap = v; 1779 struct vnode *vp = ap->a_vp; 1780 struct cnode *cp = VTOC(vp); 1781 /* upcall decl */ 1782 /* locals */ 1783 1784 ENTRY; 1785 1786 if (coda_lockdebug) { 1787 myprintf(("Attempting lock on %s\n", 1788 coda_f2s(&cp->c_fid))); 1789 } 1790 1791 return (lockmgr(&vp->v_lock, ap->a_flags, &vp->v_interlock)); 1792 } 1793 1794 int 1795 coda_unlock(void *v) 1796 { 1797 /* true args */ 1798 struct vop_unlock_args *ap = v; 1799 struct vnode *vp = ap->a_vp; 1800 struct cnode *cp = VTOC(vp); 1801 /* upcall decl */ 1802 /* locals */ 1803 1804 ENTRY; 1805 if (coda_lockdebug) { 1806 myprintf(("Attempting unlock on %s\n", 1807 coda_f2s(&cp->c_fid))); 1808 } 1809 1810 return (lockmgr(&vp->v_lock, ap->a_flags | LK_RELEASE, &vp->v_interlock)); 1811 } 1812 1813 int 1814 coda_islocked(void *v) 1815 { 1816 /* true args */ 1817 struct vop_islocked_args *ap = v; 1818 ENTRY; 1819 1820 return (lockstatus(&ap->a_vp->v_lock)); 1821 } 1822 1823 /* 1824 * Given a device and inode, obtain a locked vnode. One reference is 1825 * obtained and passed back to the caller. 1826 */ 1827 int 1828 coda_grab_vnode(dev_t dev, ino_t ino, struct vnode **vpp) 1829 { 1830 int error; 1831 struct mount *mp; 1832 1833 /* Obtain mount point structure from device. */ 1834 if (!(mp = devtomp(dev))) { 1835 myprintf(("coda_grab_vnode: devtomp(%d) returns NULL\n", dev)); 1836 return(ENXIO); 1837 } 1838 1839 /* 1840 * Obtain vnode from mount point and inode. 1841 * XXX VFS_VGET does not clearly define locked/referenced state of 1842 * returned vnode. 1843 */ 1844 error = VFS_VGET(mp, ino, vpp); 1845 if (error) { 1846 myprintf(("coda_grab_vnode: iget/vget(%d, %llu) returns %p, err %d\n", 1847 dev, (unsigned long long)ino, *vpp, error)); 1848 return(ENOENT); 1849 } 1850 return(0); 1851 } 1852 1853 void 1854 print_vattr(struct vattr *attr) 1855 { 1856 const char *typestr; 1857 1858 switch (attr->va_type) { 1859 case VNON: 1860 typestr = "VNON"; 1861 break; 1862 case VREG: 1863 typestr = "VREG"; 1864 break; 1865 case VDIR: 1866 typestr = "VDIR"; 1867 break; 1868 case VBLK: 1869 typestr = "VBLK"; 1870 break; 1871 case VCHR: 1872 typestr = "VCHR"; 1873 break; 1874 case VLNK: 1875 typestr = "VLNK"; 1876 break; 1877 case VSOCK: 1878 typestr = "VSCK"; 1879 break; 1880 case VFIFO: 1881 typestr = "VFFO"; 1882 break; 1883 case VBAD: 1884 typestr = "VBAD"; 1885 break; 1886 default: 1887 typestr = "????"; 1888 break; 1889 } 1890 1891 1892 myprintf(("attr: type %s mode %d uid %d gid %d fsid %d rdev %d\n", 1893 typestr, (int)attr->va_mode, (int)attr->va_uid, 1894 (int)attr->va_gid, (int)attr->va_fsid, (int)attr->va_rdev)); 1895 1896 myprintf((" fileid %d nlink %d size %d blocksize %d bytes %d\n", 1897 (int)attr->va_fileid, (int)attr->va_nlink, 1898 (int)attr->va_size, 1899 (int)attr->va_blocksize,(int)attr->va_bytes)); 1900 myprintf((" gen %ld flags %ld vaflags %d\n", 1901 attr->va_gen, attr->va_flags, attr->va_vaflags)); 1902 myprintf((" atime sec %d nsec %d\n", 1903 (int)attr->va_atime.tv_sec, (int)attr->va_atime.tv_nsec)); 1904 myprintf((" mtime sec %d nsec %d\n", 1905 (int)attr->va_mtime.tv_sec, (int)attr->va_mtime.tv_nsec)); 1906 myprintf((" ctime sec %d nsec %d\n", 1907 (int)attr->va_ctime.tv_sec, (int)attr->va_ctime.tv_nsec)); 1908 } 1909 1910 /* How to print a ucred */ 1911 void 1912 print_cred(kauth_cred_t cred) 1913 { 1914 1915 uint16_t ngroups; 1916 int i; 1917 1918 myprintf(("ref %d\tuid %d\n", kauth_cred_getrefcnt(cred), 1919 kauth_cred_geteuid(cred))); 1920 1921 ngroups = kauth_cred_ngroups(cred); 1922 for (i=0; i < ngroups; i++) 1923 myprintf(("\tgroup %d: (%d)\n", i, kauth_cred_group(cred, i))); 1924 myprintf(("\n")); 1925 1926 } 1927 1928 /* 1929 * Return a vnode for the given fid. 1930 * If no cnode exists for this fid create one and put it 1931 * in a table hashed by coda_f2i(). If the cnode for 1932 * this fid is already in the table return it (ref count is 1933 * incremented by coda_find. The cnode will be flushed from the 1934 * table when coda_inactive calls coda_unsave. 1935 */ 1936 struct cnode * 1937 make_coda_node(CodaFid *fid, struct mount *vfsp, short type) 1938 { 1939 struct cnode *cp; 1940 int err; 1941 1942 if ((cp = coda_find(fid)) == NULL) { 1943 struct vnode *vp; 1944 1945 cp = coda_alloc(); 1946 cp->c_fid = *fid; 1947 1948 err = getnewvnode(VT_CODA, vfsp, coda_vnodeop_p, &vp); 1949 if (err) { 1950 panic("coda: getnewvnode returned error %d", err); 1951 } 1952 vp->v_data = cp; 1953 vp->v_type = type; 1954 cp->c_vnode = vp; 1955 uvm_vnp_setsize(vp, 0); 1956 coda_save(cp); 1957 1958 } else { 1959 vref(CTOV(cp)); 1960 } 1961 1962 return cp; 1963 } 1964 1965 /* 1966 * coda_getpages may be called on a vnode which has not been opened, 1967 * e.g. to fault in pages to execute a program. In that case, we must 1968 * open the file to get the container. The vnode may or may not be 1969 * locked, and we must leave it in the same state. 1970 * XXX The protocol requires v_uobj.vmobjlock to be 1971 * held by caller, but this isn't documented in vnodeops(9) or vnode_if.src. 1972 */ 1973 int 1974 coda_getpages(void *v) 1975 { 1976 struct vop_getpages_args /* { 1977 struct vnode *a_vp; 1978 voff_t a_offset; 1979 struct vm_page **a_m; 1980 int *a_count; 1981 int a_centeridx; 1982 vm_prot_t a_access_type; 1983 int a_advice; 1984 int a_flags; 1985 } */ *ap = v; 1986 struct vnode *vp = ap->a_vp; 1987 struct cnode *cp = VTOC(vp); 1988 struct lwp *l = curlwp; 1989 kauth_cred_t cred = l->l_cred; 1990 int error, cerror; 1991 int waslocked; /* 1 if vnode lock was held on entry */ 1992 int didopen = 0; /* 1 if we opened container file */ 1993 1994 /* 1995 * Handle a case that uvm_fault doesn't quite use yet. 1996 * See layer_vnops.c. for inspiration. 1997 */ 1998 if (ap->a_flags & PGO_LOCKED) { 1999 return EBUSY; 2000 } 2001 2002 /* Check for control object. */ 2003 if (IS_CTL_VP(vp)) { 2004 printf("coda_getpages: control object %p\n", vp); 2005 mutex_exit(&vp->v_uobj.vmobjlock); 2006 return(EINVAL); 2007 } 2008 2009 /* 2010 * XXX It's really not ok to be releasing the lock we get, 2011 * because we could be overlapping with another call to 2012 * getpages and drop a lock they are relying on. We need to 2013 * figure out whether getpages ever is called holding the 2014 * lock, and if we should serialize getpages calls by some 2015 * mechanism. 2016 */ 2017 waslocked = VOP_ISLOCKED(vp); 2018 2019 /* Drop the vmobject lock. */ 2020 mutex_exit(&vp->v_uobj.vmobjlock); 2021 2022 /* Get container file if not already present. */ 2023 if (cp->c_ovp == NULL) { 2024 /* 2025 * VOP_OPEN requires a locked vnode. We must avoid 2026 * locking the vnode if it is already locked, and 2027 * leave it in the same state on exit. 2028 */ 2029 if (waslocked == 0) { 2030 cerror = vn_lock(vp, LK_EXCLUSIVE); 2031 if (cerror) { 2032 printf("coda_getpages: can't lock vnode %p\n", 2033 vp); 2034 return cerror; 2035 } 2036 #if 0 2037 printf("coda_getpages: locked vnode %p\n", vp); 2038 #endif 2039 } 2040 2041 /* 2042 * Open file (causes upcall to venus). 2043 * XXX Perhaps we should not fully open the file, but 2044 * simply obtain a container file. 2045 */ 2046 /* XXX Is it ok to do this while holding the simplelock? */ 2047 cerror = VOP_OPEN(vp, FREAD, cred); 2048 2049 if (cerror) { 2050 printf("coda_getpages: cannot open vnode %p => %d\n", 2051 vp, cerror); 2052 if (waslocked == 0) 2053 VOP_UNLOCK(vp, 0); 2054 return cerror; 2055 } 2056 2057 #if 0 2058 printf("coda_getpages: opened vnode %p\n", vp); 2059 #endif 2060 didopen = 1; 2061 } 2062 KASSERT(cp->c_ovp != NULL); 2063 2064 /* Munge the arg structure to refer to the container vnode. */ 2065 ap->a_vp = cp->c_ovp; 2066 2067 /* Get the lock on the container vnode, and call getpages on it. */ 2068 mutex_enter(&ap->a_vp->v_uobj.vmobjlock); 2069 error = VCALL(ap->a_vp, VOFFSET(vop_getpages), ap); 2070 2071 /* If we opened the vnode, we must close it. */ 2072 if (didopen) { 2073 /* 2074 * VOP_CLOSE requires a locked vnode, but we are still 2075 * holding the lock (or riding a caller's lock). 2076 */ 2077 cerror = VOP_CLOSE(vp, FREAD, cred); 2078 if (cerror != 0) 2079 /* XXX How should we handle this? */ 2080 printf("coda_getpages: closed vnode %p -> %d\n", 2081 vp, cerror); 2082 2083 /* If we obtained a lock, drop it. */ 2084 if (waslocked == 0) 2085 VOP_UNLOCK(vp, 0); 2086 } 2087 2088 return error; 2089 } 2090 2091 /* 2092 * The protocol requires v_uobj.vmobjlock to be held by the caller, as 2093 * documented in vnodeops(9). XXX vnode_if.src doesn't say this. 2094 */ 2095 int 2096 coda_putpages(void *v) 2097 { 2098 struct vop_putpages_args /* { 2099 struct vnode *a_vp; 2100 voff_t a_offlo; 2101 voff_t a_offhi; 2102 int a_flags; 2103 } */ *ap = v; 2104 struct vnode *vp = ap->a_vp; 2105 struct cnode *cp = VTOC(vp); 2106 int error; 2107 2108 /* Drop the vmobject lock. */ 2109 mutex_exit(&vp->v_uobj.vmobjlock); 2110 2111 /* Check for control object. */ 2112 if (IS_CTL_VP(vp)) { 2113 printf("coda_putpages: control object %p\n", vp); 2114 return(EINVAL); 2115 } 2116 2117 /* 2118 * If container object is not present, then there are no pages 2119 * to put; just return without error. This happens all the 2120 * time, apparently during discard of a closed vnode (which 2121 * trivially can't have dirty pages). 2122 */ 2123 if (cp->c_ovp == NULL) 2124 return 0; 2125 2126 /* Munge the arg structure to refer to the container vnode. */ 2127 ap->a_vp = cp->c_ovp; 2128 2129 /* Get the lock on the container vnode, and call putpages on it. */ 2130 mutex_enter(&ap->a_vp->v_uobj.vmobjlock); 2131 error = VCALL(ap->a_vp, VOFFSET(vop_putpages), ap); 2132 2133 return error; 2134 } 2135
Indexes created Tue Oct 14 15:09:51 GMT 2025