coda_vnops.c revision 1.76
1 /* $NetBSD: coda_vnops.c,v 1.76 2010/07/20 17:26:03 christos Exp $ */ 2 3 /* 4 * 5 * Coda: an Experimental Distributed File System 6 * Release 3.1 7 * 8 * Copyright (c) 1987-1998 Carnegie Mellon University 9 * All Rights Reserved 10 * 11 * Permission to use, copy, modify and distribute this software and its 12 * documentation is hereby granted, provided that both the copyright 13 * notice and this permission notice appear in all copies of the 14 * software, derivative works or modified versions, and any portions 15 * thereof, and that both notices appear in supporting documentation, and 16 * that credit is given to Carnegie Mellon University in all documents 17 * and publicity pertaining to direct or indirect use of this code or its 18 * derivatives. 19 * 20 * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS, 21 * SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS 22 * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON 23 * DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER 24 * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF 25 * ANY DERIVATIVE WORK. 26 * 27 * Carnegie Mellon encourages users of this software to return any 28 * improvements or extensions that they make, and to grant Carnegie 29 * Mellon the rights to redistribute these changes without encumbrance. 30 * 31 * @(#) coda/coda_vnops.c,v 1.1.1.1 1998/08/29 21:26:46 rvb Exp $ 32 */ 33 34 /* 35 * Mach Operating System 36 * Copyright (c) 1990 Carnegie-Mellon University 37 * Copyright (c) 1989 Carnegie-Mellon University 38 * All rights reserved. The CMU software License Agreement specifies 39 * the terms and conditions for use and redistribution. 40 */ 41 42 /* 43 * This code was written for the Coda file system at Carnegie Mellon 44 * University. Contributers include David Steere, James Kistler, and 45 * M. Satyanarayanan. 46 */ 47 48 #include <sys/cdefs.h> 49 __KERNEL_RCSID(0, "$NetBSD: coda_vnops.c,v 1.76 2010/07/20 17:26:03 christos Exp $"); 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/malloc.h> 54 #include <sys/errno.h> 55 #include <sys/acct.h> 56 #include <sys/file.h> 57 #include <sys/uio.h> 58 #include <sys/namei.h> 59 #include <sys/ioctl.h> 60 #include <sys/mount.h> 61 #include <sys/proc.h> 62 #include <sys/select.h> 63 #include <sys/vnode.h> 64 #include <sys/kauth.h> 65 66 #include <miscfs/genfs/genfs.h> 67 68 #include <coda/coda.h> 69 #include <coda/cnode.h> 70 #include <coda/coda_vnops.h> 71 #include <coda/coda_venus.h> 72 #include <coda/coda_opstats.h> 73 #include <coda/coda_subr.h> 74 #include <coda/coda_namecache.h> 75 #include <coda/coda_pioctl.h> 76 77 /* 78 * These flags select various performance enhancements. 79 */ 80 int coda_attr_cache = 1; /* Set to cache attributes in the kernel */ 81 int coda_symlink_cache = 1; /* Set to cache symbolic link information */ 82 int coda_access_cache = 1; /* Set to handle some access checks directly */ 83 84 /* structure to keep track of vfs calls */ 85 86 struct coda_op_stats coda_vnodeopstats[CODA_VNODEOPS_SIZE]; 87 88 #define MARK_ENTRY(op) (coda_vnodeopstats[op].entries++) 89 #define MARK_INT_SAT(op) (coda_vnodeopstats[op].sat_intrn++) 90 #define MARK_INT_FAIL(op) (coda_vnodeopstats[op].unsat_intrn++) 91 #define MARK_INT_GEN(op) (coda_vnodeopstats[op].gen_intrn++) 92 93 /* What we are delaying for in printf */ 94 int coda_printf_delay = 0; /* in microseconds */ 95 int coda_vnop_print_entry = 0; 96 static int coda_lockdebug = 0; 97 98 #define ENTRY if(coda_vnop_print_entry) myprintf(("Entered %s\n",__func__)) 99 100 /* Definition of the vnode operation vector */ 101 102 const struct vnodeopv_entry_desc coda_vnodeop_entries[] = { 103 { &vop_default_desc, coda_vop_error }, 104 { &vop_lookup_desc, coda_lookup }, /* lookup */ 105 { &vop_create_desc, coda_create }, /* create */ 106 { &vop_mknod_desc, coda_vop_error }, /* mknod */ 107 { &vop_open_desc, coda_open }, /* open */ 108 { &vop_close_desc, coda_close }, /* close */ 109 { &vop_access_desc, coda_access }, /* access */ 110 { &vop_getattr_desc, coda_getattr }, /* getattr */ 111 { &vop_setattr_desc, coda_setattr }, /* setattr */ 112 { &vop_read_desc, coda_read }, /* read */ 113 { &vop_write_desc, coda_write }, /* write */ 114 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 115 { &vop_ioctl_desc, coda_ioctl }, /* ioctl */ 116 { &vop_mmap_desc, genfs_mmap }, /* mmap */ 117 { &vop_fsync_desc, coda_fsync }, /* fsync */ 118 { &vop_remove_desc, coda_remove }, /* remove */ 119 { &vop_link_desc, coda_link }, /* link */ 120 { &vop_rename_desc, coda_rename }, /* rename */ 121 { &vop_mkdir_desc, coda_mkdir }, /* mkdir */ 122 { &vop_rmdir_desc, coda_rmdir }, /* rmdir */ 123 { &vop_symlink_desc, coda_symlink }, /* symlink */ 124 { &vop_readdir_desc, coda_readdir }, /* readdir */ 125 { &vop_readlink_desc, coda_readlink }, /* readlink */ 126 { &vop_abortop_desc, coda_abortop }, /* abortop */ 127 { &vop_inactive_desc, coda_inactive }, /* inactive */ 128 { &vop_reclaim_desc, coda_reclaim }, /* reclaim */ 129 { &vop_lock_desc, coda_lock }, /* lock */ 130 { &vop_unlock_desc, coda_unlock }, /* unlock */ 131 { &vop_bmap_desc, coda_bmap }, /* bmap */ 132 { &vop_strategy_desc, coda_strategy }, /* strategy */ 133 { &vop_print_desc, coda_vop_error }, /* print */ 134 { &vop_islocked_desc, coda_islocked }, /* islocked */ 135 { &vop_pathconf_desc, coda_vop_error }, /* pathconf */ 136 { &vop_advlock_desc, coda_vop_nop }, /* advlock */ 137 { &vop_bwrite_desc, coda_vop_error }, /* bwrite */ 138 { &vop_seek_desc, genfs_seek }, /* seek */ 139 { &vop_poll_desc, genfs_poll }, /* poll */ 140 { &vop_getpages_desc, coda_getpages }, /* getpages */ 141 { &vop_putpages_desc, coda_putpages }, /* putpages */ 142 { NULL, NULL } 143 }; 144 145 const struct vnodeopv_desc coda_vnodeop_opv_desc = 146 { &coda_vnodeop_p, coda_vnodeop_entries }; 147 148 /* Definitions of NetBSD vnodeop interfaces */ 149 150 /* 151 * A generic error routine. Return EIO without looking at arguments. 152 */ 153 int 154 coda_vop_error(void *anon) { 155 struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; 156 157 if (codadebug) { 158 myprintf(("coda_vop_error: Vnode operation %s called (error).\n", 159 (*desc)->vdesc_name)); 160 } 161 162 return EIO; 163 } 164 165 /* A generic do-nothing. */ 166 int 167 coda_vop_nop(void *anon) { 168 struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; 169 170 if (codadebug) { 171 myprintf(("Vnode operation %s called, but unsupported\n", 172 (*desc)->vdesc_name)); 173 } 174 return (0); 175 } 176 177 int 178 coda_vnodeopstats_init(void) 179 { 180 int i; 181 182 for(i=0;i<CODA_VNODEOPS_SIZE;i++) { 183 coda_vnodeopstats[i].opcode = i; 184 coda_vnodeopstats[i].entries = 0; 185 coda_vnodeopstats[i].sat_intrn = 0; 186 coda_vnodeopstats[i].unsat_intrn = 0; 187 coda_vnodeopstats[i].gen_intrn = 0; 188 } 189 190 return 0; 191 } 192 193 /* 194 * XXX The entire relationship between VOP_OPEN and having a container 195 * file (via venus_open) needs to be reexamined. In particular, it's 196 * valid to open/mmap/close and then reference. Instead of doing 197 * VOP_OPEN when getpages needs a container, we should do the 198 * venus_open part, and record that the vnode has opened the container 199 * for getpages, and do the matching logical close on coda_inactive. 200 * Further, coda_rdwr needs a container file, and sometimes needs to 201 * do the equivalent of open (core dumps). 202 */ 203 /* 204 * coda_open calls Venus to return the device and inode of the 205 * container file, and then obtains a vnode for that file. The 206 * container vnode is stored in the coda vnode, and a reference is 207 * added for each open file. 208 */ 209 int 210 coda_open(void *v) 211 { 212 /* 213 * NetBSD can pass the O_EXCL flag in mode, even though the check 214 * has already happened. Venus defensively assumes that if open 215 * is passed the EXCL, it must be a bug. We strip the flag here. 216 */ 217 /* true args */ 218 struct vop_open_args *ap = v; 219 struct vnode *vp = ap->a_vp; 220 struct cnode *cp = VTOC(vp); 221 int flag = ap->a_mode & (~O_EXCL); 222 kauth_cred_t cred = ap->a_cred; 223 /* locals */ 224 int error; 225 dev_t dev; /* container file device, inode, vnode */ 226 ino_t inode; 227 struct vnode *container_vp; 228 229 MARK_ENTRY(CODA_OPEN_STATS); 230 231 /* Check for open of control file. */ 232 if (IS_CTL_VP(vp)) { 233 /* if (WRITABLE(flag)) */ 234 if (flag & (FWRITE | O_TRUNC | O_CREAT | O_EXCL)) { 235 MARK_INT_FAIL(CODA_OPEN_STATS); 236 return(EACCES); 237 } 238 MARK_INT_SAT(CODA_OPEN_STATS); 239 return(0); 240 } 241 242 error = venus_open(vtomi(vp), &cp->c_fid, flag, cred, curlwp, &dev, &inode); 243 if (error) 244 return (error); 245 if (!error) { 246 CODADEBUG(CODA_OPEN, 247 myprintf(("open: dev 0x%llx inode %llu result %d\n", 248 (unsigned long long)dev, (unsigned long long)inode, error));) 249 } 250 251 /* 252 * Obtain locked and referenced container vnode from container 253 * device/inode. 254 */ 255 error = coda_grab_vnode(dev, inode, &container_vp); 256 if (error) 257 return (error); 258 259 /* Save the vnode pointer for the container file. */ 260 if (cp->c_ovp == NULL) { 261 cp->c_ovp = container_vp; 262 } else { 263 if (cp->c_ovp != container_vp) 264 /* 265 * Perhaps venus returned a different container, or 266 * something else went wrong. 267 */ 268 panic("coda_open: cp->c_ovp != container_vp"); 269 } 270 cp->c_ocount++; 271 272 /* Flush the attribute cache if writing the file. */ 273 if (flag & FWRITE) { 274 cp->c_owrite++; 275 cp->c_flags &= ~C_VATTR; 276 } 277 278 /* 279 * Save the <device, inode> pair for the container file to speed 280 * up subsequent reads while closed (mmap, program execution). 281 * This is perhaps safe because venus will invalidate the node 282 * before changing the container file mapping. 283 */ 284 cp->c_device = dev; 285 cp->c_inode = inode; 286 287 /* Open the container file. */ 288 error = VOP_OPEN(container_vp, flag, cred); 289 /* 290 * Drop the lock on the container, after we have done VOP_OPEN 291 * (which requires a locked vnode). 292 */ 293 VOP_UNLOCK(container_vp); 294 return(error); 295 } 296 297 /* 298 * Close the cache file used for I/O and notify Venus. 299 */ 300 int 301 coda_close(void *v) 302 { 303 /* true args */ 304 struct vop_close_args *ap = v; 305 struct vnode *vp = ap->a_vp; 306 struct cnode *cp = VTOC(vp); 307 int flag = ap->a_fflag; 308 kauth_cred_t cred = ap->a_cred; 309 /* locals */ 310 int error; 311 312 MARK_ENTRY(CODA_CLOSE_STATS); 313 314 /* Check for close of control file. */ 315 if (IS_CTL_VP(vp)) { 316 MARK_INT_SAT(CODA_CLOSE_STATS); 317 return(0); 318 } 319 320 /* 321 * XXX The IS_UNMOUNTING part of this is very suspect. 322 */ 323 if (IS_UNMOUNTING(cp)) { 324 if (cp->c_ovp) { 325 #ifdef CODA_VERBOSE 326 printf("coda_close: destroying container ref %d, ufs vp %p of vp %p/cp %p\n", 327 vp->v_usecount, cp->c_ovp, vp, cp); 328 #endif 329 #ifdef hmm 330 vgone(cp->c_ovp); 331 #else 332 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 333 VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ 334 vput(cp->c_ovp); 335 #endif 336 } else { 337 #ifdef CODA_VERBOSE 338 printf("coda_close: NO container vp %p/cp %p\n", vp, cp); 339 #endif 340 } 341 return ENODEV; 342 } 343 344 /* Lock the container node, and VOP_CLOSE it. */ 345 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 346 VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ 347 /* 348 * Drop the lock we just obtained, and vrele the container vnode. 349 * Decrement reference counts, and clear container vnode pointer on 350 * last close. 351 */ 352 vput(cp->c_ovp); 353 if (flag & FWRITE) 354 --cp->c_owrite; 355 if (--cp->c_ocount == 0) 356 cp->c_ovp = NULL; 357 358 error = venus_close(vtomi(vp), &cp->c_fid, flag, cred, curlwp); 359 360 CODADEBUG(CODA_CLOSE, myprintf(("close: result %d\n",error)); ) 361 return(error); 362 } 363 364 int 365 coda_read(void *v) 366 { 367 struct vop_read_args *ap = v; 368 369 ENTRY; 370 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_READ, 371 ap->a_ioflag, ap->a_cred, curlwp)); 372 } 373 374 int 375 coda_write(void *v) 376 { 377 struct vop_write_args *ap = v; 378 379 ENTRY; 380 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_WRITE, 381 ap->a_ioflag, ap->a_cred, curlwp)); 382 } 383 384 int 385 coda_rdwr(struct vnode *vp, struct uio *uiop, enum uio_rw rw, int ioflag, 386 kauth_cred_t cred, struct lwp *l) 387 { 388 /* upcall decl */ 389 /* NOTE: container file operation!!! */ 390 /* locals */ 391 struct cnode *cp = VTOC(vp); 392 struct vnode *cfvp = cp->c_ovp; 393 struct proc *p = l->l_proc; 394 int opened_internally = 0; 395 int error = 0; 396 397 MARK_ENTRY(CODA_RDWR_STATS); 398 399 CODADEBUG(CODA_RDWR, myprintf(("coda_rdwr(%d, %p, %lu, %lld)\n", rw, 400 uiop->uio_iov->iov_base, 401 (unsigned long) uiop->uio_resid, 402 (long long) uiop->uio_offset)); ) 403 404 /* Check for rdwr of control object. */ 405 if (IS_CTL_VP(vp)) { 406 MARK_INT_FAIL(CODA_RDWR_STATS); 407 return(EINVAL); 408 } 409 410 /* Redirect the request to UFS. */ 411 412 /* 413 * If file is not already open this must be a page 414 * {read,write} request. Iget the cache file's inode 415 * pointer if we still have its <device, inode> pair. 416 * Otherwise, we must do an internal open to derive the 417 * pair. 418 * XXX Integrate this into a coherent strategy for container 419 * file acquisition. 420 */ 421 if (cfvp == NULL) { 422 /* 423 * If we're dumping core, do the internal open. Otherwise 424 * venus won't have the correct size of the core when 425 * it's completely written. 426 */ 427 if (cp->c_inode != 0 && !(p && (p->p_acflag & ACORE))) { 428 printf("coda_rdwr: grabbing container vnode, losing reference\n"); 429 /* Get locked and refed vnode. */ 430 error = coda_grab_vnode(cp->c_device, cp->c_inode, &cfvp); 431 if (error) { 432 MARK_INT_FAIL(CODA_RDWR_STATS); 433 return(error); 434 } 435 /* 436 * Drop lock. 437 * XXX Where is reference released. 438 */ 439 VOP_UNLOCK(cfvp); 440 } 441 else { 442 printf("coda_rdwr: internal VOP_OPEN\n"); 443 opened_internally = 1; 444 MARK_INT_GEN(CODA_OPEN_STATS); 445 error = VOP_OPEN(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); 446 #ifdef CODA_VERBOSE 447 printf("coda_rdwr: Internally Opening %p\n", vp); 448 #endif 449 if (error) { 450 MARK_INT_FAIL(CODA_RDWR_STATS); 451 return(error); 452 } 453 cfvp = cp->c_ovp; 454 } 455 } 456 457 /* Have UFS handle the call. */ 458 CODADEBUG(CODA_RDWR, myprintf(("indirect rdwr: fid = %s, refcnt = %d\n", 459 coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount)); ) 460 461 if (rw == UIO_READ) { 462 error = VOP_READ(cfvp, uiop, ioflag, cred); 463 } else { 464 error = VOP_WRITE(cfvp, uiop, ioflag, cred); 465 } 466 467 if (error) 468 MARK_INT_FAIL(CODA_RDWR_STATS); 469 else 470 MARK_INT_SAT(CODA_RDWR_STATS); 471 472 /* Do an internal close if necessary. */ 473 if (opened_internally) { 474 MARK_INT_GEN(CODA_CLOSE_STATS); 475 (void)VOP_CLOSE(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); 476 } 477 478 /* Invalidate cached attributes if writing. */ 479 if (rw == UIO_WRITE) 480 cp->c_flags &= ~C_VATTR; 481 return(error); 482 } 483 484 int 485 coda_ioctl(void *v) 486 { 487 /* true args */ 488 struct vop_ioctl_args *ap = v; 489 struct vnode *vp = ap->a_vp; 490 int com = ap->a_command; 491 void *data = ap->a_data; 492 int flag = ap->a_fflag; 493 kauth_cred_t cred = ap->a_cred; 494 /* locals */ 495 int error; 496 struct vnode *tvp; 497 struct PioctlData *iap = (struct PioctlData *)data; 498 namei_simple_flags_t sflags; 499 500 MARK_ENTRY(CODA_IOCTL_STATS); 501 502 CODADEBUG(CODA_IOCTL, myprintf(("in coda_ioctl on %s\n", iap->path));) 503 504 /* Don't check for operation on a dying object, for ctlvp it 505 shouldn't matter */ 506 507 /* Must be control object to succeed. */ 508 if (!IS_CTL_VP(vp)) { 509 MARK_INT_FAIL(CODA_IOCTL_STATS); 510 CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: vp != ctlvp"));) 511 return (EOPNOTSUPP); 512 } 513 /* Look up the pathname. */ 514 515 /* Should we use the name cache here? It would get it from 516 lookupname sooner or later anyway, right? */ 517 518 sflags = iap->follow ? NSM_FOLLOW_NOEMULROOT : NSM_NOFOLLOW_NOEMULROOT; 519 error = namei_simple_user(iap->path, sflags, &tvp); 520 521 if (error) { 522 MARK_INT_FAIL(CODA_IOCTL_STATS); 523 CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: lookup returns %d\n", 524 error));) 525 return(error); 526 } 527 528 /* 529 * Make sure this is a coda style cnode, but it may be a 530 * different vfsp 531 */ 532 /* XXX: this totally violates the comment about vtagtype in vnode.h */ 533 if (tvp->v_tag != VT_CODA) { 534 vrele(tvp); 535 MARK_INT_FAIL(CODA_IOCTL_STATS); 536 CODADEBUG(CODA_IOCTL, 537 myprintf(("coda_ioctl error: %s not a coda object\n", 538 iap->path));) 539 return(EINVAL); 540 } 541 542 if (iap->vi.in_size > VC_MAXDATASIZE || iap->vi.out_size > VC_MAXDATASIZE) { 543 vrele(tvp); 544 return(EINVAL); 545 } 546 error = venus_ioctl(vtomi(tvp), &((VTOC(tvp))->c_fid), com, flag, data, 547 cred, curlwp); 548 549 if (error) 550 MARK_INT_FAIL(CODA_IOCTL_STATS); 551 else 552 CODADEBUG(CODA_IOCTL, myprintf(("Ioctl returns %d \n", error)); ) 553 554 vrele(tvp); 555 return(error); 556 } 557 558 /* 559 * To reduce the cost of a user-level venus;we cache attributes in 560 * the kernel. Each cnode has storage allocated for an attribute. If 561 * c_vattr is valid, return a reference to it. Otherwise, get the 562 * attributes from venus and store them in the cnode. There is some 563 * question if this method is a security leak. But I think that in 564 * order to make this call, the user must have done a lookup and 565 * opened the file, and therefore should already have access. 566 */ 567 int 568 coda_getattr(void *v) 569 { 570 /* true args */ 571 struct vop_getattr_args *ap = v; 572 struct vnode *vp = ap->a_vp; 573 struct cnode *cp = VTOC(vp); 574 struct vattr *vap = ap->a_vap; 575 kauth_cred_t cred = ap->a_cred; 576 /* locals */ 577 int error; 578 579 MARK_ENTRY(CODA_GETATTR_STATS); 580 581 /* Check for getattr of control object. */ 582 if (IS_CTL_VP(vp)) { 583 MARK_INT_FAIL(CODA_GETATTR_STATS); 584 return(ENOENT); 585 } 586 587 /* Check to see if the attributes have already been cached */ 588 if (VALID_VATTR(cp)) { 589 CODADEBUG(CODA_GETATTR, { myprintf(("attr cache hit: %s\n", 590 coda_f2s(&cp->c_fid)));}); 591 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 592 print_vattr(&cp->c_vattr); ); 593 594 *vap = cp->c_vattr; 595 MARK_INT_SAT(CODA_GETATTR_STATS); 596 return(0); 597 } 598 599 error = venus_getattr(vtomi(vp), &cp->c_fid, cred, curlwp, vap); 600 601 if (!error) { 602 CODADEBUG(CODA_GETATTR, myprintf(("getattr miss %s: result %d\n", 603 coda_f2s(&cp->c_fid), error)); ) 604 605 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 606 print_vattr(vap); ); 607 608 /* If not open for write, store attributes in cnode */ 609 if ((cp->c_owrite == 0) && (coda_attr_cache)) { 610 cp->c_vattr = *vap; 611 cp->c_flags |= C_VATTR; 612 } 613 614 } 615 return(error); 616 } 617 618 int 619 coda_setattr(void *v) 620 { 621 /* true args */ 622 struct vop_setattr_args *ap = v; 623 struct vnode *vp = ap->a_vp; 624 struct cnode *cp = VTOC(vp); 625 struct vattr *vap = ap->a_vap; 626 kauth_cred_t cred = ap->a_cred; 627 /* locals */ 628 int error; 629 630 MARK_ENTRY(CODA_SETATTR_STATS); 631 632 /* Check for setattr of control object. */ 633 if (IS_CTL_VP(vp)) { 634 MARK_INT_FAIL(CODA_SETATTR_STATS); 635 return(ENOENT); 636 } 637 638 if (codadebug & CODADBGMSK(CODA_SETATTR)) { 639 print_vattr(vap); 640 } 641 error = venus_setattr(vtomi(vp), &cp->c_fid, vap, cred, curlwp); 642 643 if (!error) 644 cp->c_flags &= ~C_VATTR; 645 646 CODADEBUG(CODA_SETATTR, myprintf(("setattr %d\n", error)); ) 647 return(error); 648 } 649 650 int 651 coda_access(void *v) 652 { 653 /* true args */ 654 struct vop_access_args *ap = v; 655 struct vnode *vp = ap->a_vp; 656 struct cnode *cp = VTOC(vp); 657 int mode = ap->a_mode; 658 kauth_cred_t cred = ap->a_cred; 659 /* locals */ 660 int error; 661 662 MARK_ENTRY(CODA_ACCESS_STATS); 663 664 /* Check for access of control object. Only read access is 665 allowed on it. */ 666 if (IS_CTL_VP(vp)) { 667 /* bogus hack - all will be marked as successes */ 668 MARK_INT_SAT(CODA_ACCESS_STATS); 669 return(((mode & VREAD) && !(mode & (VWRITE | VEXEC))) 670 ? 0 : EACCES); 671 } 672 673 /* 674 * if the file is a directory, and we are checking exec (eg lookup) 675 * access, and the file is in the namecache, then the user must have 676 * lookup access to it. 677 */ 678 if (coda_access_cache) { 679 if ((vp->v_type == VDIR) && (mode & VEXEC)) { 680 if (coda_nc_lookup(cp, ".", 1, cred)) { 681 MARK_INT_SAT(CODA_ACCESS_STATS); 682 return(0); /* it was in the cache */ 683 } 684 } 685 } 686 687 error = venus_access(vtomi(vp), &cp->c_fid, mode, cred, curlwp); 688 689 return(error); 690 } 691 692 /* 693 * CODA abort op, called after namei() when a CREATE/DELETE isn't actually 694 * done. If a buffer has been saved in anticipation of a coda_create or 695 * a coda_remove, delete it. 696 */ 697 /* ARGSUSED */ 698 int 699 coda_abortop(void *v) 700 { 701 /* true args */ 702 struct vop_abortop_args /* { 703 struct vnode *a_dvp; 704 struct componentname *a_cnp; 705 } */ *ap = v; 706 /* upcall decl */ 707 /* locals */ 708 709 if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF) 710 PNBUF_PUT(ap->a_cnp->cn_pnbuf); 711 return (0); 712 } 713 714 int 715 coda_readlink(void *v) 716 { 717 /* true args */ 718 struct vop_readlink_args *ap = v; 719 struct vnode *vp = ap->a_vp; 720 struct cnode *cp = VTOC(vp); 721 struct uio *uiop = ap->a_uio; 722 kauth_cred_t cred = ap->a_cred; 723 /* locals */ 724 struct lwp *l = curlwp; 725 int error; 726 char *str; 727 int len; 728 729 MARK_ENTRY(CODA_READLINK_STATS); 730 731 /* Check for readlink of control object. */ 732 if (IS_CTL_VP(vp)) { 733 MARK_INT_FAIL(CODA_READLINK_STATS); 734 return(ENOENT); 735 } 736 737 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { /* symlink was cached */ 738 uiop->uio_rw = UIO_READ; 739 error = uiomove(cp->c_symlink, (int)cp->c_symlen, uiop); 740 if (error) 741 MARK_INT_FAIL(CODA_READLINK_STATS); 742 else 743 MARK_INT_SAT(CODA_READLINK_STATS); 744 return(error); 745 } 746 747 error = venus_readlink(vtomi(vp), &cp->c_fid, cred, l, &str, &len); 748 749 if (!error) { 750 uiop->uio_rw = UIO_READ; 751 error = uiomove(str, len, uiop); 752 753 if (coda_symlink_cache) { 754 cp->c_symlink = str; 755 cp->c_symlen = len; 756 cp->c_flags |= C_SYMLINK; 757 } else 758 CODA_FREE(str, len); 759 } 760 761 CODADEBUG(CODA_READLINK, myprintf(("in readlink result %d\n",error));) 762 return(error); 763 } 764 765 int 766 coda_fsync(void *v) 767 { 768 /* true args */ 769 struct vop_fsync_args *ap = v; 770 struct vnode *vp = ap->a_vp; 771 struct cnode *cp = VTOC(vp); 772 kauth_cred_t cred = ap->a_cred; 773 /* locals */ 774 struct vnode *convp = cp->c_ovp; 775 int error; 776 777 MARK_ENTRY(CODA_FSYNC_STATS); 778 779 /* Check for fsync on an unmounting object */ 780 /* The NetBSD kernel, in it's infinite wisdom, can try to fsync 781 * after an unmount has been initiated. This is a Bad Thing, 782 * which we have to avoid. Not a legitimate failure for stats. 783 */ 784 if (IS_UNMOUNTING(cp)) { 785 return(ENODEV); 786 } 787 788 /* Check for fsync of control object. */ 789 if (IS_CTL_VP(vp)) { 790 MARK_INT_SAT(CODA_FSYNC_STATS); 791 return(0); 792 } 793 794 if (convp) 795 VOP_FSYNC(convp, cred, MNT_WAIT, 0, 0); 796 797 /* 798 * We can expect fsync on any vnode at all if venus is pruging it. 799 * Venus can't very well answer the fsync request, now can it? 800 * Hopefully, it won't have to, because hopefully, venus preserves 801 * the (possibly untrue) invariant that it never purges an open 802 * vnode. Hopefully. 803 */ 804 if (cp->c_flags & C_PURGING) { 805 return(0); 806 } 807 808 error = venus_fsync(vtomi(vp), &cp->c_fid, cred, curlwp); 809 810 CODADEBUG(CODA_FSYNC, myprintf(("in fsync result %d\n",error)); ); 811 return(error); 812 } 813 814 /* 815 * vp is locked on entry, and we must unlock it. 816 * XXX This routine is suspect and probably needs rewriting. 817 */ 818 int 819 coda_inactive(void *v) 820 { 821 /* true args */ 822 struct vop_inactive_args *ap = v; 823 struct vnode *vp = ap->a_vp; 824 struct cnode *cp = VTOC(vp); 825 kauth_cred_t cred __unused = NULL; 826 827 /* We don't need to send inactive to venus - DCS */ 828 MARK_ENTRY(CODA_INACTIVE_STATS); 829 830 if (IS_CTL_VP(vp)) { 831 MARK_INT_SAT(CODA_INACTIVE_STATS); 832 return 0; 833 } 834 835 CODADEBUG(CODA_INACTIVE, myprintf(("in inactive, %s, vfsp %p\n", 836 coda_f2s(&cp->c_fid), vp->v_mount));) 837 838 /* If an array has been allocated to hold the symlink, deallocate it */ 839 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { 840 if (cp->c_symlink == NULL) 841 panic("coda_inactive: null symlink pointer in cnode"); 842 843 CODA_FREE(cp->c_symlink, cp->c_symlen); 844 cp->c_flags &= ~C_SYMLINK; 845 cp->c_symlen = 0; 846 } 847 848 /* Remove it from the table so it can't be found. */ 849 coda_unsave(cp); 850 if (vp->v_mount->mnt_data == NULL) { 851 myprintf(("Help! vfsp->vfs_data was NULL, but vnode %p wasn't dying\n", vp)); 852 panic("badness in coda_inactive"); 853 } 854 855 if (IS_UNMOUNTING(cp)) { 856 /* XXX Do we need to VOP_CLOSE container vnodes? */ 857 if (vp->v_usecount > 0) 858 printf("coda_inactive: IS_UNMOUNTING %p usecount %d\n", 859 vp, vp->v_usecount); 860 if (cp->c_ovp != NULL) 861 printf("coda_inactive: %p ovp != NULL\n", vp); 862 VOP_UNLOCK(vp); 863 } else { 864 /* Sanity checks that perhaps should be panic. */ 865 if (vp->v_usecount) { 866 printf("coda_inactive: %p usecount %d\n", vp, vp->v_usecount); 867 } 868 if (cp->c_ovp != NULL) { 869 printf("coda_inactive: %p ovp != NULL\n", vp); 870 } 871 VOP_UNLOCK(vp); 872 *ap->a_recycle = true; 873 } 874 875 MARK_INT_SAT(CODA_INACTIVE_STATS); 876 return(0); 877 } 878 879 /* 880 * Coda does not use the normal namecache, but a private version. 881 * Consider how to use the standard facility instead. 882 */ 883 int 884 coda_lookup(void *v) 885 { 886 /* true args */ 887 struct vop_lookup_args *ap = v; 888 /* (locked) vnode of dir in which to do lookup */ 889 struct vnode *dvp = ap->a_dvp; 890 struct cnode *dcp = VTOC(dvp); 891 /* output variable for result */ 892 struct vnode **vpp = ap->a_vpp; 893 /* name to lookup */ 894 struct componentname *cnp = ap->a_cnp; 895 kauth_cred_t cred = cnp->cn_cred; 896 struct lwp *l = curlwp; 897 /* locals */ 898 struct cnode *cp; 899 const char *nm = cnp->cn_nameptr; 900 int len = cnp->cn_namelen; 901 int flags = cnp->cn_flags; 902 int isdot; 903 CodaFid VFid; 904 int vtype; 905 int error = 0; 906 907 MARK_ENTRY(CODA_LOOKUP_STATS); 908 909 CODADEBUG(CODA_LOOKUP, myprintf(("lookup: %s in %s\n", 910 nm, coda_f2s(&dcp->c_fid)));); 911 912 /* 913 * XXX componentname flags in MODMASK are not handled at all 914 */ 915 916 /* 917 * The overall strategy is to switch on the lookup type and get a 918 * result vnode that is vref'd but not locked. Then, the code at 919 * exit: switches on ., .., and regular lookups and does the right 920 * locking. 921 */ 922 923 /* Check for lookup of control object. */ 924 if (IS_CTL_NAME(dvp, nm, len)) { 925 *vpp = coda_ctlvp; 926 vref(*vpp); 927 MARK_INT_SAT(CODA_LOOKUP_STATS); 928 goto exit; 929 } 930 931 /* Avoid trying to hand venus an unreasonably long name. */ 932 if (len+1 > CODA_MAXNAMLEN) { 933 MARK_INT_FAIL(CODA_LOOKUP_STATS); 934 CODADEBUG(CODA_LOOKUP, myprintf(("name too long: lookup, %s (%s)\n", 935 coda_f2s(&dcp->c_fid), nm));); 936 *vpp = (struct vnode *)0; 937 error = EINVAL; 938 goto exit; 939 } 940 941 /* 942 * XXX Check for DOT lookups, and short circuit all the caches, 943 * just doing an extra vref. (venus guarantees that lookup of 944 * . returns self.) 945 */ 946 isdot = (len == 1 && nm[0] == '.'); 947 948 /* 949 * Try to resolve the lookup in the minicache. If that fails, ask 950 * venus to do the lookup. XXX The interaction between vnode 951 * locking and any locking that coda does is not clear. 952 */ 953 cp = coda_nc_lookup(dcp, nm, len, cred); 954 if (cp) { 955 *vpp = CTOV(cp); 956 vref(*vpp); 957 CODADEBUG(CODA_LOOKUP, 958 myprintf(("lookup result %d vpp %p\n",error,*vpp));) 959 } else { 960 /* The name wasn't cached, so ask Venus. */ 961 error = venus_lookup(vtomi(dvp), &dcp->c_fid, nm, len, cred, l, &VFid, &vtype); 962 963 if (error) { 964 MARK_INT_FAIL(CODA_LOOKUP_STATS); 965 CODADEBUG(CODA_LOOKUP, myprintf(("lookup error on %s (%s)%d\n", 966 coda_f2s(&dcp->c_fid), nm, error));) 967 *vpp = (struct vnode *)0; 968 } else { 969 MARK_INT_SAT(CODA_LOOKUP_STATS); 970 CODADEBUG(CODA_LOOKUP, 971 myprintf(("lookup: %s type %o result %d\n", 972 coda_f2s(&VFid), vtype, error)); ) 973 974 cp = make_coda_node(&VFid, dvp->v_mount, vtype); 975 *vpp = CTOV(cp); 976 /* vpp is now vrefed. */ 977 978 /* 979 * Unless this vnode is marked CODA_NOCACHE, enter it into 980 * the coda name cache to avoid a future venus round-trip. 981 * XXX Interaction with componentname NOCACHE is unclear. 982 */ 983 if (!(vtype & CODA_NOCACHE)) 984 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 985 } 986 } 987 988 exit: 989 /* 990 * If we are creating, and this was the last name to be looked up, 991 * and the error was ENOENT, then make the leaf NULL and return 992 * success. 993 * XXX Check against new lookup rules. 994 */ 995 if (((cnp->cn_nameiop == CREATE) || (cnp->cn_nameiop == RENAME)) 996 && (cnp->cn_flags & ISLASTCN) 997 && (error == ENOENT)) 998 { 999 error = EJUSTRETURN; 1000 cnp->cn_flags |= SAVENAME; 1001 *ap->a_vpp = NULL; 1002 } 1003 1004 /* 1005 * If we are removing, and we are at the last element, and we 1006 * found it, then we need to keep the name around so that the 1007 * removal will go ahead as planned. 1008 * XXX Check against new lookup rules. 1009 */ 1010 if ((cnp->cn_nameiop == DELETE) 1011 && (cnp->cn_flags & ISLASTCN) 1012 && !error) 1013 { 1014 cnp->cn_flags |= SAVENAME; 1015 } 1016 1017 /* 1018 * If the lookup succeeded, we must generally lock the returned 1019 * vnode. This could be a ., .., or normal lookup. See 1020 * vnodeops(9) for the details. 1021 */ 1022 /* 1023 * XXX LK_RETRY is likely incorrect. Handle vn_lock failure 1024 * somehow, and remove LK_RETRY. 1025 */ 1026 if (!error || (error == EJUSTRETURN)) { 1027 /* Lookup has a value and it isn't "."? */ 1028 if (*ap->a_vpp && (*ap->a_vpp != dvp)) { 1029 if (flags & ISDOTDOT) 1030 /* ..: unlock parent */ 1031 VOP_UNLOCK(dvp); 1032 /* all but .: lock child */ 1033 vn_lock(*ap->a_vpp, LK_EXCLUSIVE | LK_RETRY); 1034 if (flags & ISDOTDOT) 1035 /* ..: relock parent */ 1036 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1037 } 1038 /* else .: leave dvp locked */ 1039 } else { 1040 /* The lookup failed, so return NULL. Leave dvp locked. */ 1041 *ap->a_vpp = NULL; 1042 } 1043 return(error); 1044 } 1045 1046 /*ARGSUSED*/ 1047 int 1048 coda_create(void *v) 1049 { 1050 /* true args */ 1051 struct vop_create_args *ap = v; 1052 struct vnode *dvp = ap->a_dvp; 1053 struct cnode *dcp = VTOC(dvp); 1054 struct vattr *va = ap->a_vap; 1055 int exclusive = 1; 1056 int mode = ap->a_vap->va_mode; 1057 struct vnode **vpp = ap->a_vpp; 1058 struct componentname *cnp = ap->a_cnp; 1059 kauth_cred_t cred = cnp->cn_cred; 1060 struct lwp *l = curlwp; 1061 /* locals */ 1062 int error; 1063 struct cnode *cp; 1064 const char *nm = cnp->cn_nameptr; 1065 int len = cnp->cn_namelen; 1066 CodaFid VFid; 1067 struct vattr attr; 1068 1069 MARK_ENTRY(CODA_CREATE_STATS); 1070 1071 /* All creates are exclusive XXX */ 1072 /* I'm assuming the 'mode' argument is the file mode bits XXX */ 1073 1074 /* Check for create of control object. */ 1075 if (IS_CTL_NAME(dvp, nm, len)) { 1076 *vpp = (struct vnode *)0; 1077 MARK_INT_FAIL(CODA_CREATE_STATS); 1078 return(EACCES); 1079 } 1080 1081 error = venus_create(vtomi(dvp), &dcp->c_fid, nm, len, exclusive, mode, va, cred, l, &VFid, &attr); 1082 1083 if (!error) { 1084 1085 /* 1086 * XXX Violation of venus/kernel invariants is a difficult case, 1087 * but venus should not be able to cause a panic. 1088 */ 1089 /* If this is an exclusive create, panic if the file already exists. */ 1090 /* Venus should have detected the file and reported EEXIST. */ 1091 1092 if ((exclusive == 1) && 1093 (coda_find(&VFid) != NULL)) 1094 panic("cnode existed for newly created file!"); 1095 1096 cp = make_coda_node(&VFid, dvp->v_mount, attr.va_type); 1097 *vpp = CTOV(cp); 1098 1099 /* XXX vnodeops doesn't say this argument can be changed. */ 1100 /* Update va to reflect the new attributes. */ 1101 (*va) = attr; 1102 1103 /* Update the attribute cache and mark it as valid */ 1104 if (coda_attr_cache) { 1105 VTOC(*vpp)->c_vattr = attr; 1106 VTOC(*vpp)->c_flags |= C_VATTR; 1107 } 1108 1109 /* Invalidate parent's attr cache (modification time has changed). */ 1110 VTOC(dvp)->c_flags &= ~C_VATTR; 1111 1112 /* enter the new vnode in the Name Cache */ 1113 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1114 1115 CODADEBUG(CODA_CREATE, 1116 myprintf(("create: %s, result %d\n", 1117 coda_f2s(&VFid), error)); ) 1118 } else { 1119 *vpp = (struct vnode *)0; 1120 CODADEBUG(CODA_CREATE, myprintf(("create error %d\n", error));) 1121 } 1122 1123 /* 1124 * vnodeops(9) says that we must unlock the parent and lock the child. 1125 * XXX Should we lock the child first? 1126 */ 1127 vput(dvp); 1128 if (!error) { 1129 if ((cnp->cn_flags & LOCKLEAF) == 0) { 1130 /* This should not happen; flags are for lookup only. */ 1131 printf("coda_create: LOCKLEAF not set!\n"); 1132 } 1133 1134 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { 1135 /* XXX Perhaps avoid this panic. */ 1136 panic("coda_create: couldn't lock child"); 1137 } 1138 } 1139 1140 /* Per vnodeops(9), free name except on success and SAVESTART. */ 1141 if (error || (cnp->cn_flags & SAVESTART) == 0) { 1142 PNBUF_PUT(cnp->cn_pnbuf); 1143 } 1144 return(error); 1145 } 1146 1147 int 1148 coda_remove(void *v) 1149 { 1150 /* true args */ 1151 struct vop_remove_args *ap = v; 1152 struct vnode *dvp = ap->a_dvp; 1153 struct cnode *cp = VTOC(dvp); 1154 struct vnode *vp = ap->a_vp; 1155 struct componentname *cnp = ap->a_cnp; 1156 kauth_cred_t cred = cnp->cn_cred; 1157 struct lwp *l = curlwp; 1158 /* locals */ 1159 int error; 1160 const char *nm = cnp->cn_nameptr; 1161 int len = cnp->cn_namelen; 1162 struct cnode *tp; 1163 1164 MARK_ENTRY(CODA_REMOVE_STATS); 1165 1166 CODADEBUG(CODA_REMOVE, myprintf(("remove: %s in %s\n", 1167 nm, coda_f2s(&cp->c_fid)));); 1168 1169 /* Remove the file's entry from the CODA Name Cache */ 1170 /* We're being conservative here, it might be that this person 1171 * doesn't really have sufficient access to delete the file 1172 * but we feel zapping the entry won't really hurt anyone -- dcs 1173 */ 1174 /* I'm gonna go out on a limb here. If a file and a hardlink to it 1175 * exist, and one is removed, the link count on the other will be 1176 * off by 1. We could either invalidate the attrs if cached, or 1177 * fix them. I'll try to fix them. DCS 11/8/94 1178 */ 1179 tp = coda_nc_lookup(VTOC(dvp), nm, len, cred); 1180 if (tp) { 1181 if (VALID_VATTR(tp)) { /* If attrs are cached */ 1182 if (tp->c_vattr.va_nlink > 1) { /* If it's a hard link */ 1183 tp->c_vattr.va_nlink--; 1184 } 1185 } 1186 1187 coda_nc_zapfile(VTOC(dvp), nm, len); 1188 /* No need to flush it if it doesn't exist! */ 1189 } 1190 /* Invalidate the parent's attr cache, the modification time has changed */ 1191 VTOC(dvp)->c_flags &= ~C_VATTR; 1192 1193 /* Check for remove of control object. */ 1194 if (IS_CTL_NAME(dvp, nm, len)) { 1195 MARK_INT_FAIL(CODA_REMOVE_STATS); 1196 return(ENOENT); 1197 } 1198 1199 error = venus_remove(vtomi(dvp), &cp->c_fid, nm, len, cred, l); 1200 1201 CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n",error)); ) 1202 1203 /* 1204 * Unlock parent and child (avoiding double if "."). 1205 */ 1206 if (dvp == vp) { 1207 vrele(vp); 1208 } else { 1209 vput(vp); 1210 } 1211 vput(dvp); 1212 1213 return(error); 1214 } 1215 1216 /* 1217 * dvp is the directory where the link is to go, and is locked. 1218 * vp is the object to be linked to, and is unlocked. 1219 * At exit, we must unlock dvp, and vput dvp. 1220 */ 1221 int 1222 coda_link(void *v) 1223 { 1224 /* true args */ 1225 struct vop_link_args *ap = v; 1226 struct vnode *vp = ap->a_vp; 1227 struct cnode *cp = VTOC(vp); 1228 struct vnode *dvp = ap->a_dvp; 1229 struct cnode *dcp = VTOC(dvp); 1230 struct componentname *cnp = ap->a_cnp; 1231 kauth_cred_t cred = cnp->cn_cred; 1232 struct lwp *l = curlwp; 1233 /* locals */ 1234 int error; 1235 const char *nm = cnp->cn_nameptr; 1236 int len = cnp->cn_namelen; 1237 1238 MARK_ENTRY(CODA_LINK_STATS); 1239 1240 if (codadebug & CODADBGMSK(CODA_LINK)) { 1241 1242 myprintf(("nb_link: vp fid: %s\n", 1243 coda_f2s(&cp->c_fid))); 1244 myprintf(("nb_link: dvp fid: %s)\n", 1245 coda_f2s(&dcp->c_fid))); 1246 1247 } 1248 if (codadebug & CODADBGMSK(CODA_LINK)) { 1249 myprintf(("link: vp fid: %s\n", 1250 coda_f2s(&cp->c_fid))); 1251 myprintf(("link: dvp fid: %s\n", 1252 coda_f2s(&dcp->c_fid))); 1253 1254 } 1255 1256 /* Check for link to/from control object. */ 1257 if (IS_CTL_NAME(dvp, nm, len) || IS_CTL_VP(vp)) { 1258 MARK_INT_FAIL(CODA_LINK_STATS); 1259 return(EACCES); 1260 } 1261 1262 /* If linking . to a name, error out earlier. */ 1263 if (vp == dvp) { 1264 printf("coda_link vp==dvp\n"); 1265 error = EISDIR; 1266 goto exit; 1267 } 1268 1269 /* XXX Why does venus_link need the vnode to be locked?*/ 1270 if ((error = vn_lock(vp, LK_EXCLUSIVE)) != 0) { 1271 printf("coda_link: couldn't lock vnode %p\n", vp); 1272 error = EFAULT; /* XXX better value */ 1273 goto exit; 1274 } 1275 error = venus_link(vtomi(vp), &cp->c_fid, &dcp->c_fid, nm, len, cred, l); 1276 VOP_UNLOCK(vp); 1277 1278 /* Invalidate parent's attr cache (the modification time has changed). */ 1279 VTOC(dvp)->c_flags &= ~C_VATTR; 1280 /* Invalidate child's attr cache (XXX why). */ 1281 VTOC(vp)->c_flags &= ~C_VATTR; 1282 1283 CODADEBUG(CODA_LINK, myprintf(("in link result %d\n",error)); ) 1284 1285 exit: 1286 vput(dvp); 1287 return(error); 1288 } 1289 1290 int 1291 coda_rename(void *v) 1292 { 1293 /* true args */ 1294 struct vop_rename_args *ap = v; 1295 struct vnode *odvp = ap->a_fdvp; 1296 struct cnode *odcp = VTOC(odvp); 1297 struct componentname *fcnp = ap->a_fcnp; 1298 struct vnode *ndvp = ap->a_tdvp; 1299 struct cnode *ndcp = VTOC(ndvp); 1300 struct componentname *tcnp = ap->a_tcnp; 1301 kauth_cred_t cred = fcnp->cn_cred; 1302 struct lwp *l = curlwp; 1303 /* true args */ 1304 int error; 1305 const char *fnm = fcnp->cn_nameptr; 1306 int flen = fcnp->cn_namelen; 1307 const char *tnm = tcnp->cn_nameptr; 1308 int tlen = tcnp->cn_namelen; 1309 1310 MARK_ENTRY(CODA_RENAME_STATS); 1311 1312 /* Hmmm. The vnodes are already looked up. Perhaps they are locked? 1313 This could be Bad. XXX */ 1314 #ifdef OLD_DIAGNOSTIC 1315 if ((fcnp->cn_cred != tcnp->cn_cred) 1316 || (fcnp->cn_lwp != tcnp->cn_lwp)) 1317 { 1318 panic("coda_rename: component names don't agree"); 1319 } 1320 #endif 1321 1322 /* Check for rename involving control object. */ 1323 if (IS_CTL_NAME(odvp, fnm, flen) || IS_CTL_NAME(ndvp, tnm, tlen)) { 1324 MARK_INT_FAIL(CODA_RENAME_STATS); 1325 return(EACCES); 1326 } 1327 1328 /* Problem with moving directories -- need to flush entry for .. */ 1329 if (odvp != ndvp) { 1330 struct cnode *ovcp = coda_nc_lookup(VTOC(odvp), fnm, flen, cred); 1331 if (ovcp) { 1332 struct vnode *ovp = CTOV(ovcp); 1333 if ((ovp) && 1334 (ovp->v_type == VDIR)) /* If it's a directory */ 1335 coda_nc_zapfile(VTOC(ovp),"..", 2); 1336 } 1337 } 1338 1339 /* Remove the entries for both source and target files */ 1340 coda_nc_zapfile(VTOC(odvp), fnm, flen); 1341 coda_nc_zapfile(VTOC(ndvp), tnm, tlen); 1342 1343 /* Invalidate the parent's attr cache, the modification time has changed */ 1344 VTOC(odvp)->c_flags &= ~C_VATTR; 1345 VTOC(ndvp)->c_flags &= ~C_VATTR; 1346 1347 if (flen+1 > CODA_MAXNAMLEN) { 1348 MARK_INT_FAIL(CODA_RENAME_STATS); 1349 error = EINVAL; 1350 goto exit; 1351 } 1352 1353 if (tlen+1 > CODA_MAXNAMLEN) { 1354 MARK_INT_FAIL(CODA_RENAME_STATS); 1355 error = EINVAL; 1356 goto exit; 1357 } 1358 1359 error = venus_rename(vtomi(odvp), &odcp->c_fid, &ndcp->c_fid, fnm, flen, tnm, tlen, cred, l); 1360 1361 exit: 1362 CODADEBUG(CODA_RENAME, myprintf(("in rename result %d\n",error));) 1363 /* XXX - do we need to call cache pureg on the moved vnode? */ 1364 cache_purge(ap->a_fvp); 1365 1366 /* It seems to be incumbent on us to drop locks on all four vnodes */ 1367 /* From-vnodes are not locked, only ref'd. To-vnodes are locked. */ 1368 1369 vrele(ap->a_fvp); 1370 vrele(odvp); 1371 1372 if (ap->a_tvp) { 1373 if (ap->a_tvp == ndvp) { 1374 vrele(ap->a_tvp); 1375 } else { 1376 vput(ap->a_tvp); 1377 } 1378 } 1379 1380 vput(ndvp); 1381 return(error); 1382 } 1383 1384 int 1385 coda_mkdir(void *v) 1386 { 1387 /* true args */ 1388 struct vop_mkdir_args *ap = v; 1389 struct vnode *dvp = ap->a_dvp; 1390 struct cnode *dcp = VTOC(dvp); 1391 struct componentname *cnp = ap->a_cnp; 1392 struct vattr *va = ap->a_vap; 1393 struct vnode **vpp = ap->a_vpp; 1394 kauth_cred_t cred = cnp->cn_cred; 1395 struct lwp *l = curlwp; 1396 /* locals */ 1397 int error; 1398 const char *nm = cnp->cn_nameptr; 1399 int len = cnp->cn_namelen; 1400 struct cnode *cp; 1401 CodaFid VFid; 1402 struct vattr ova; 1403 1404 MARK_ENTRY(CODA_MKDIR_STATS); 1405 1406 /* Check for mkdir of target object. */ 1407 if (IS_CTL_NAME(dvp, nm, len)) { 1408 *vpp = (struct vnode *)0; 1409 MARK_INT_FAIL(CODA_MKDIR_STATS); 1410 return(EACCES); 1411 } 1412 1413 if (len+1 > CODA_MAXNAMLEN) { 1414 *vpp = (struct vnode *)0; 1415 MARK_INT_FAIL(CODA_MKDIR_STATS); 1416 return(EACCES); 1417 } 1418 1419 error = venus_mkdir(vtomi(dvp), &dcp->c_fid, nm, len, va, cred, l, &VFid, &ova); 1420 1421 if (!error) { 1422 if (coda_find(&VFid) != NULL) 1423 panic("cnode existed for newly created directory!"); 1424 1425 1426 cp = make_coda_node(&VFid, dvp->v_mount, va->va_type); 1427 *vpp = CTOV(cp); 1428 1429 /* enter the new vnode in the Name Cache */ 1430 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1431 1432 /* as a side effect, enter "." and ".." for the directory */ 1433 coda_nc_enter(VTOC(*vpp), ".", 1, cred, VTOC(*vpp)); 1434 coda_nc_enter(VTOC(*vpp), "..", 2, cred, VTOC(dvp)); 1435 1436 if (coda_attr_cache) { 1437 VTOC(*vpp)->c_vattr = ova; /* update the attr cache */ 1438 VTOC(*vpp)->c_flags |= C_VATTR; /* Valid attributes in cnode */ 1439 } 1440 1441 /* Invalidate the parent's attr cache, the modification time has changed */ 1442 VTOC(dvp)->c_flags &= ~C_VATTR; 1443 1444 CODADEBUG( CODA_MKDIR, myprintf(("mkdir: %s result %d\n", 1445 coda_f2s(&VFid), error)); ) 1446 } else { 1447 *vpp = (struct vnode *)0; 1448 CODADEBUG(CODA_MKDIR, myprintf(("mkdir error %d\n",error));) 1449 } 1450 1451 /* 1452 * Currently, all mkdirs explicitly vput their dvp's. 1453 * It also appears that we *must* lock the vpp, since 1454 * lockleaf isn't set, but someone down the road is going 1455 * to try to unlock the new directory. 1456 */ 1457 vput(dvp); 1458 if (!error) { 1459 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { 1460 panic("coda_mkdir: couldn't lock child"); 1461 } 1462 } 1463 1464 /* Per vnodeops(9), free name except on success and SAVESTART. */ 1465 if (error || (cnp->cn_flags & SAVESTART) == 0) { 1466 PNBUF_PUT(cnp->cn_pnbuf); 1467 } 1468 return(error); 1469 } 1470 1471 int 1472 coda_rmdir(void *v) 1473 { 1474 /* true args */ 1475 struct vop_rmdir_args *ap = v; 1476 struct vnode *dvp = ap->a_dvp; 1477 struct cnode *dcp = VTOC(dvp); 1478 struct vnode *vp = ap->a_vp; 1479 struct componentname *cnp = ap->a_cnp; 1480 kauth_cred_t cred = cnp->cn_cred; 1481 struct lwp *l = curlwp; 1482 /* true args */ 1483 int error; 1484 const char *nm = cnp->cn_nameptr; 1485 int len = cnp->cn_namelen; 1486 struct cnode *cp; 1487 1488 MARK_ENTRY(CODA_RMDIR_STATS); 1489 1490 /* Check for rmdir of control object. */ 1491 if (IS_CTL_NAME(dvp, nm, len)) { 1492 MARK_INT_FAIL(CODA_RMDIR_STATS); 1493 return(ENOENT); 1494 } 1495 1496 /* Can't remove . in self. */ 1497 if (dvp == vp) { 1498 printf("coda_rmdir: dvp == vp\n"); 1499 error = EINVAL; 1500 goto exit; 1501 } 1502 1503 /* 1504 * The caller may not have adequate permissions, and the venus 1505 * operation may fail, but it doesn't hurt from a correctness 1506 * viewpoint to invalidate cache entries. 1507 * XXX Why isn't this done after the venus_rmdir call? 1508 */ 1509 /* Look up child in name cache (by name, from parent). */ 1510 cp = coda_nc_lookup(dcp, nm, len, cred); 1511 /* If found, remove all children of the child (., ..). */ 1512 if (cp) coda_nc_zapParentfid(&(cp->c_fid), NOT_DOWNCALL); 1513 1514 /* Remove child's own entry. */ 1515 coda_nc_zapfile(dcp, nm, len); 1516 1517 /* Invalidate parent's attr cache (the modification time has changed). */ 1518 dcp->c_flags &= ~C_VATTR; 1519 1520 error = venus_rmdir(vtomi(dvp), &dcp->c_fid, nm, len, cred, l); 1521 1522 CODADEBUG(CODA_RMDIR, myprintf(("in rmdir result %d\n", error)); ) 1523 1524 exit: 1525 /* vput both vnodes */ 1526 vput(dvp); 1527 if (dvp == vp) { 1528 vrele(vp); 1529 } else { 1530 vput(vp); 1531 } 1532 1533 return(error); 1534 } 1535 1536 int 1537 coda_symlink(void *v) 1538 { 1539 /* true args */ 1540 struct vop_symlink_args *ap = v; 1541 struct vnode *dvp = ap->a_dvp; 1542 struct cnode *dcp = VTOC(dvp); 1543 /* a_vpp is used in place below */ 1544 struct componentname *cnp = ap->a_cnp; 1545 struct vattr *tva = ap->a_vap; 1546 char *path = ap->a_target; 1547 kauth_cred_t cred = cnp->cn_cred; 1548 struct lwp *l = curlwp; 1549 /* locals */ 1550 int error; 1551 u_long saved_cn_flags; 1552 const char *nm = cnp->cn_nameptr; 1553 int len = cnp->cn_namelen; 1554 int plen = strlen(path); 1555 1556 /* 1557 * Here's the strategy for the moment: perform the symlink, then 1558 * do a lookup to grab the resulting vnode. I know this requires 1559 * two communications with Venus for a new sybolic link, but 1560 * that's the way the ball bounces. I don't yet want to change 1561 * the way the Mach symlink works. When Mach support is 1562 * deprecated, we should change symlink so that the common case 1563 * returns the resultant vnode in a vpp argument. 1564 */ 1565 1566 MARK_ENTRY(CODA_SYMLINK_STATS); 1567 1568 /* Check for symlink of control object. */ 1569 if (IS_CTL_NAME(dvp, nm, len)) { 1570 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1571 error = EACCES; 1572 goto exit; 1573 } 1574 1575 if (plen+1 > CODA_MAXPATHLEN) { 1576 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1577 error = EINVAL; 1578 goto exit; 1579 } 1580 1581 if (len+1 > CODA_MAXNAMLEN) { 1582 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1583 error = EINVAL; 1584 goto exit; 1585 } 1586 1587 error = venus_symlink(vtomi(dvp), &dcp->c_fid, path, plen, nm, len, tva, cred, l); 1588 1589 /* Invalidate the parent's attr cache (modification time has changed). */ 1590 dcp->c_flags &= ~C_VATTR; 1591 1592 if (!error) { 1593 /* 1594 * VOP_SYMLINK is not defined to pay attention to cnp->cn_flags; 1595 * these are defined only for VOP_LOOKUP. We desire to reuse 1596 * cnp for a VOP_LOOKUP operation, and must be sure to not pass 1597 * stray flags passed to us. Such stray flags can occur because 1598 * sys_symlink makes a namei call and then reuses the 1599 * componentname structure. 1600 */ 1601 /* 1602 * XXX Arguably we should create our own componentname structure 1603 * and not reuse the one that was passed in. 1604 */ 1605 saved_cn_flags = cnp->cn_flags; 1606 cnp->cn_flags &= ~(MODMASK | OPMASK); 1607 cnp->cn_flags |= LOOKUP; 1608 error = VOP_LOOKUP(dvp, ap->a_vpp, cnp); 1609 cnp->cn_flags = saved_cn_flags; 1610 /* Either an error occurs, or ap->a_vpp is locked. */ 1611 } 1612 1613 exit: 1614 /* unlock and deference parent */ 1615 vput(dvp); 1616 1617 /* Per vnodeops(9), free name except on success and SAVESTART. */ 1618 if (error || (cnp->cn_flags & SAVESTART) == 0) { 1619 PNBUF_PUT(cnp->cn_pnbuf); 1620 } 1621 1622 CODADEBUG(CODA_SYMLINK, myprintf(("in symlink result %d\n",error)); ) 1623 return(error); 1624 } 1625 1626 /* 1627 * Read directory entries. 1628 */ 1629 int 1630 coda_readdir(void *v) 1631 { 1632 /* true args */ 1633 struct vop_readdir_args *ap = v; 1634 struct vnode *vp = ap->a_vp; 1635 struct cnode *cp = VTOC(vp); 1636 struct uio *uiop = ap->a_uio; 1637 kauth_cred_t cred = ap->a_cred; 1638 int *eofflag = ap->a_eofflag; 1639 off_t **cookies = ap->a_cookies; 1640 int *ncookies = ap->a_ncookies; 1641 /* upcall decl */ 1642 /* locals */ 1643 int error = 0; 1644 1645 MARK_ENTRY(CODA_READDIR_STATS); 1646 1647 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)); ) 1648 1649 /* Check for readdir of control object. */ 1650 if (IS_CTL_VP(vp)) { 1651 MARK_INT_FAIL(CODA_READDIR_STATS); 1652 return(ENOENT); 1653 } 1654 1655 { 1656 /* Redirect the request to UFS. */ 1657 1658 /* If directory is not already open do an "internal open" on it. */ 1659 int opened_internally = 0; 1660 if (cp->c_ovp == NULL) { 1661 opened_internally = 1; 1662 MARK_INT_GEN(CODA_OPEN_STATS); 1663 error = VOP_OPEN(vp, FREAD, cred); 1664 #ifdef CODA_VERBOSE 1665 printf("coda_readdir: Internally Opening %p\n", vp); 1666 #endif 1667 if (error) return(error); 1668 } else 1669 vp = cp->c_ovp; 1670 1671 /* Have UFS handle the call. */ 1672 CODADEBUG(CODA_READDIR, myprintf(( 1673 "indirect readdir: fid = %s, refcnt = %d\n", 1674 coda_f2s(&cp->c_fid), vp->v_usecount)); ) 1675 error = VOP_READDIR(vp, uiop, cred, eofflag, cookies, ncookies); 1676 if (error) 1677 MARK_INT_FAIL(CODA_READDIR_STATS); 1678 else 1679 MARK_INT_SAT(CODA_READDIR_STATS); 1680 1681 /* Do an "internal close" if necessary. */ 1682 if (opened_internally) { 1683 MARK_INT_GEN(CODA_CLOSE_STATS); 1684 (void)VOP_CLOSE(vp, FREAD, cred); 1685 } 1686 } 1687 1688 return(error); 1689 } 1690 1691 /* 1692 * Convert from file system blocks to device blocks 1693 */ 1694 int 1695 coda_bmap(void *v) 1696 { 1697 /* XXX on the global proc */ 1698 /* true args */ 1699 struct vop_bmap_args *ap = v; 1700 struct vnode *vp __unused = ap->a_vp; /* file's vnode */ 1701 daddr_t bn __unused = ap->a_bn; /* fs block number */ 1702 struct vnode **vpp = ap->a_vpp; /* RETURN vp of device */ 1703 daddr_t *bnp __unused = ap->a_bnp; /* RETURN device block number */ 1704 struct lwp *l __unused = curlwp; 1705 /* upcall decl */ 1706 /* locals */ 1707 1708 *vpp = (struct vnode *)0; 1709 myprintf(("coda_bmap called!\n")); 1710 return(EINVAL); 1711 } 1712 1713 /* 1714 * I don't think the following two things are used anywhere, so I've 1715 * commented them out 1716 * 1717 * struct buf *async_bufhead; 1718 * int async_daemon_count; 1719 */ 1720 int 1721 coda_strategy(void *v) 1722 { 1723 /* true args */ 1724 struct vop_strategy_args *ap = v; 1725 struct buf *bp __unused = ap->a_bp; 1726 struct lwp *l __unused = curlwp; 1727 /* upcall decl */ 1728 /* locals */ 1729 1730 myprintf(("coda_strategy called! ")); 1731 return(EINVAL); 1732 } 1733 1734 int 1735 coda_reclaim(void *v) 1736 { 1737 /* true args */ 1738 struct vop_reclaim_args *ap = v; 1739 struct vnode *vp = ap->a_vp; 1740 struct cnode *cp = VTOC(vp); 1741 /* upcall decl */ 1742 /* locals */ 1743 1744 /* 1745 * Forced unmount/flush will let vnodes with non zero use be destroyed! 1746 */ 1747 ENTRY; 1748 1749 if (IS_UNMOUNTING(cp)) { 1750 #ifdef DEBUG 1751 if (VTOC(vp)->c_ovp) { 1752 if (IS_UNMOUNTING(cp)) 1753 printf("coda_reclaim: c_ovp not void: vp %p, cp %p\n", vp, cp); 1754 } 1755 #endif 1756 } else { 1757 #ifdef OLD_DIAGNOSTIC 1758 if (vp->v_usecount != 0) 1759 print("coda_reclaim: pushing active %p\n", vp); 1760 if (VTOC(vp)->c_ovp) { 1761 panic("coda_reclaim: c_ovp not void"); 1762 } 1763 #endif 1764 } 1765 cache_purge(vp); 1766 coda_free(VTOC(vp)); 1767 SET_VTOC(vp) = NULL; 1768 return (0); 1769 } 1770 1771 int 1772 coda_lock(void *v) 1773 { 1774 /* true args */ 1775 struct vop_lock_args *ap = v; 1776 struct vnode *vp = ap->a_vp; 1777 struct cnode *cp = VTOC(vp); 1778 /* upcall decl */ 1779 /* locals */ 1780 1781 ENTRY; 1782 1783 if (coda_lockdebug) { 1784 myprintf(("Attempting lock on %s\n", 1785 coda_f2s(&cp->c_fid))); 1786 } 1787 1788 return genfs_lock(v); 1789 } 1790 1791 int 1792 coda_unlock(void *v) 1793 { 1794 /* true args */ 1795 struct vop_unlock_args *ap = v; 1796 struct vnode *vp = ap->a_vp; 1797 struct cnode *cp = VTOC(vp); 1798 /* upcall decl */ 1799 /* locals */ 1800 1801 ENTRY; 1802 if (coda_lockdebug) { 1803 myprintf(("Attempting unlock on %s\n", 1804 coda_f2s(&cp->c_fid))); 1805 } 1806 1807 return genfs_unlock(v); 1808 } 1809 1810 int 1811 coda_islocked(void *v) 1812 { 1813 /* true args */ 1814 ENTRY; 1815 1816 return genfs_islocked(v); 1817 } 1818 1819 /* 1820 * Given a device and inode, obtain a locked vnode. One reference is 1821 * obtained and passed back to the caller. 1822 */ 1823 int 1824 coda_grab_vnode(dev_t dev, ino_t ino, struct vnode **vpp) 1825 { 1826 int error; 1827 struct mount *mp; 1828 1829 /* Obtain mount point structure from device. */ 1830 if (!(mp = devtomp(dev))) { 1831 myprintf(("coda_grab_vnode: devtomp(0x%llx) returns NULL\n", 1832 (unsigned long long)dev)); 1833 return(ENXIO); 1834 } 1835 1836 /* 1837 * Obtain vnode from mount point and inode. 1838 * XXX VFS_VGET does not clearly define locked/referenced state of 1839 * returned vnode. 1840 */ 1841 error = VFS_VGET(mp, ino, vpp); 1842 if (error) { 1843 myprintf(("coda_grab_vnode: iget/vget(0x%llx, %llu) returns %p, err %d\n", 1844 (unsigned long long)dev, (unsigned long long)ino, *vpp, error)); 1845 return(ENOENT); 1846 } 1847 return(0); 1848 } 1849 1850 void 1851 print_vattr(struct vattr *attr) 1852 { 1853 const char *typestr; 1854 1855 switch (attr->va_type) { 1856 case VNON: 1857 typestr = "VNON"; 1858 break; 1859 case VREG: 1860 typestr = "VREG"; 1861 break; 1862 case VDIR: 1863 typestr = "VDIR"; 1864 break; 1865 case VBLK: 1866 typestr = "VBLK"; 1867 break; 1868 case VCHR: 1869 typestr = "VCHR"; 1870 break; 1871 case VLNK: 1872 typestr = "VLNK"; 1873 break; 1874 case VSOCK: 1875 typestr = "VSCK"; 1876 break; 1877 case VFIFO: 1878 typestr = "VFFO"; 1879 break; 1880 case VBAD: 1881 typestr = "VBAD"; 1882 break; 1883 default: 1884 typestr = "????"; 1885 break; 1886 } 1887 1888 1889 myprintf(("attr: type %s mode %d uid %d gid %d fsid %d rdev %d\n", 1890 typestr, (int)attr->va_mode, (int)attr->va_uid, 1891 (int)attr->va_gid, (int)attr->va_fsid, (int)attr->va_rdev)); 1892 1893 myprintf((" fileid %d nlink %d size %d blocksize %d bytes %d\n", 1894 (int)attr->va_fileid, (int)attr->va_nlink, 1895 (int)attr->va_size, 1896 (int)attr->va_blocksize,(int)attr->va_bytes)); 1897 myprintf((" gen %ld flags %ld vaflags %d\n", 1898 attr->va_gen, attr->va_flags, attr->va_vaflags)); 1899 myprintf((" atime sec %d nsec %d\n", 1900 (int)attr->va_atime.tv_sec, (int)attr->va_atime.tv_nsec)); 1901 myprintf((" mtime sec %d nsec %d\n", 1902 (int)attr->va_mtime.tv_sec, (int)attr->va_mtime.tv_nsec)); 1903 myprintf((" ctime sec %d nsec %d\n", 1904 (int)attr->va_ctime.tv_sec, (int)attr->va_ctime.tv_nsec)); 1905 } 1906 1907 /* How to print a ucred */ 1908 void 1909 print_cred(kauth_cred_t cred) 1910 { 1911 1912 uint16_t ngroups; 1913 int i; 1914 1915 myprintf(("ref %d\tuid %d\n", kauth_cred_getrefcnt(cred), 1916 kauth_cred_geteuid(cred))); 1917 1918 ngroups = kauth_cred_ngroups(cred); 1919 for (i=0; i < ngroups; i++) 1920 myprintf(("\tgroup %d: (%d)\n", i, kauth_cred_group(cred, i))); 1921 myprintf(("\n")); 1922 1923 } 1924 1925 /* 1926 * Return a vnode for the given fid. 1927 * If no cnode exists for this fid create one and put it 1928 * in a table hashed by coda_f2i(). If the cnode for 1929 * this fid is already in the table return it (ref count is 1930 * incremented by coda_find. The cnode will be flushed from the 1931 * table when coda_inactive calls coda_unsave. 1932 */ 1933 struct cnode * 1934 make_coda_node(CodaFid *fid, struct mount *vfsp, short type) 1935 { 1936 struct cnode *cp; 1937 int err; 1938 1939 if ((cp = coda_find(fid)) == NULL) { 1940 struct vnode *vp; 1941 1942 cp = coda_alloc(); 1943 cp->c_fid = *fid; 1944 1945 err = getnewvnode(VT_CODA, vfsp, coda_vnodeop_p, &vp); 1946 if (err) { 1947 panic("coda: getnewvnode returned error %d", err); 1948 } 1949 vp->v_data = cp; 1950 vp->v_type = type; 1951 cp->c_vnode = vp; 1952 uvm_vnp_setsize(vp, 0); 1953 coda_save(cp); 1954 1955 } else { 1956 vref(CTOV(cp)); 1957 } 1958 1959 return cp; 1960 } 1961 1962 /* 1963 * coda_getpages may be called on a vnode which has not been opened, 1964 * e.g. to fault in pages to execute a program. In that case, we must 1965 * open the file to get the container. The vnode may or may not be 1966 * locked, and we must leave it in the same state. 1967 * XXX The protocol requires v_uobj.vmobjlock to be 1968 * held by caller, but this isn't documented in vnodeops(9) or vnode_if.src. 1969 */ 1970 int 1971 coda_getpages(void *v) 1972 { 1973 struct vop_getpages_args /* { 1974 struct vnode *a_vp; 1975 voff_t a_offset; 1976 struct vm_page **a_m; 1977 int *a_count; 1978 int a_centeridx; 1979 vm_prot_t a_access_type; 1980 int a_advice; 1981 int a_flags; 1982 } */ *ap = v; 1983 struct vnode *vp = ap->a_vp; 1984 struct cnode *cp = VTOC(vp); 1985 struct lwp *l = curlwp; 1986 kauth_cred_t cred = l->l_cred; 1987 int error, cerror; 1988 int waslocked; /* 1 if vnode lock was held on entry */ 1989 int didopen = 0; /* 1 if we opened container file */ 1990 1991 /* 1992 * Handle a case that uvm_fault doesn't quite use yet. 1993 * See layer_vnops.c. for inspiration. 1994 */ 1995 if (ap->a_flags & PGO_LOCKED) { 1996 return EBUSY; 1997 } 1998 1999 /* Check for control object. */ 2000 if (IS_CTL_VP(vp)) { 2001 printf("coda_getpages: control object %p\n", vp); 2002 mutex_exit(&vp->v_uobj.vmobjlock); 2003 return(EINVAL); 2004 } 2005 2006 /* 2007 * XXX It's really not ok to be releasing the lock we get, 2008 * because we could be overlapping with another call to 2009 * getpages and drop a lock they are relying on. We need to 2010 * figure out whether getpages ever is called holding the 2011 * lock, and if we should serialize getpages calls by some 2012 * mechanism. 2013 */ 2014 /* XXX VOP_ISLOCKED() may not be used for lock decisions. */ 2015 waslocked = VOP_ISLOCKED(vp); 2016 2017 /* Drop the vmobject lock. */ 2018 mutex_exit(&vp->v_uobj.vmobjlock); 2019 2020 /* Get container file if not already present. */ 2021 if (cp->c_ovp == NULL) { 2022 /* 2023 * VOP_OPEN requires a locked vnode. We must avoid 2024 * locking the vnode if it is already locked, and 2025 * leave it in the same state on exit. 2026 */ 2027 if (waslocked == 0) { 2028 cerror = vn_lock(vp, LK_EXCLUSIVE); 2029 if (cerror) { 2030 printf("coda_getpages: can't lock vnode %p\n", 2031 vp); 2032 return cerror; 2033 } 2034 #if 0 2035 printf("coda_getpages: locked vnode %p\n", vp); 2036 #endif 2037 } 2038 2039 /* 2040 * Open file (causes upcall to venus). 2041 * XXX Perhaps we should not fully open the file, but 2042 * simply obtain a container file. 2043 */ 2044 /* XXX Is it ok to do this while holding the simplelock? */ 2045 cerror = VOP_OPEN(vp, FREAD, cred); 2046 2047 if (cerror) { 2048 printf("coda_getpages: cannot open vnode %p => %d\n", 2049 vp, cerror); 2050 if (waslocked == 0) 2051 VOP_UNLOCK(vp); 2052 return cerror; 2053 } 2054 2055 #if 0 2056 printf("coda_getpages: opened vnode %p\n", vp); 2057 #endif 2058 didopen = 1; 2059 } 2060 KASSERT(cp->c_ovp != NULL); 2061 2062 /* Munge the arg structure to refer to the container vnode. */ 2063 ap->a_vp = cp->c_ovp; 2064 2065 /* Get the lock on the container vnode, and call getpages on it. */ 2066 mutex_enter(&ap->a_vp->v_uobj.vmobjlock); 2067 error = VCALL(ap->a_vp, VOFFSET(vop_getpages), ap); 2068 2069 /* If we opened the vnode, we must close it. */ 2070 if (didopen) { 2071 /* 2072 * VOP_CLOSE requires a locked vnode, but we are still 2073 * holding the lock (or riding a caller's lock). 2074 */ 2075 cerror = VOP_CLOSE(vp, FREAD, cred); 2076 if (cerror != 0) 2077 /* XXX How should we handle this? */ 2078 printf("coda_getpages: closed vnode %p -> %d\n", 2079 vp, cerror); 2080 2081 /* If we obtained a lock, drop it. */ 2082 if (waslocked == 0) 2083 VOP_UNLOCK(vp); 2084 } 2085 2086 return error; 2087 } 2088 2089 /* 2090 * The protocol requires v_uobj.vmobjlock to be held by the caller, as 2091 * documented in vnodeops(9). XXX vnode_if.src doesn't say this. 2092 */ 2093 int 2094 coda_putpages(void *v) 2095 { 2096 struct vop_putpages_args /* { 2097 struct vnode *a_vp; 2098 voff_t a_offlo; 2099 voff_t a_offhi; 2100 int a_flags; 2101 } */ *ap = v; 2102 struct vnode *vp = ap->a_vp; 2103 struct cnode *cp = VTOC(vp); 2104 int error; 2105 2106 /* Drop the vmobject lock. */ 2107 mutex_exit(&vp->v_uobj.vmobjlock); 2108 2109 /* Check for control object. */ 2110 if (IS_CTL_VP(vp)) { 2111 printf("coda_putpages: control object %p\n", vp); 2112 return(EINVAL); 2113 } 2114 2115 /* 2116 * If container object is not present, then there are no pages 2117 * to put; just return without error. This happens all the 2118 * time, apparently during discard of a closed vnode (which 2119 * trivially can't have dirty pages). 2120 */ 2121 if (cp->c_ovp == NULL) 2122 return 0; 2123 2124 /* Munge the arg structure to refer to the container vnode. */ 2125 ap->a_vp = cp->c_ovp; 2126 2127 /* Get the lock on the container vnode, and call putpages on it. */ 2128 mutex_enter(&ap->a_vp->v_uobj.vmobjlock); 2129 error = VCALL(ap->a_vp, VOFFSET(vop_putpages), ap); 2130 2131 return error; 2132 } 2133
Indexes created Wed Oct 15 16:09:53 GMT 2025