coda_vnops.c revision 1.81.2.1
1 /* $NetBSD: coda_vnops.c,v 1.81.2.1 2012/05/23 10:07:52 yamt 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 1.81.2.1 2012/05/23 10:07:52 yamt Exp $"); 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/malloc.h> 54 #include <sys/errno.h> 55 #include <sys/acct.h> 56 #include <sys/file.h> 57 #include <sys/uio.h> 58 #include <sys/namei.h> 59 #include <sys/ioctl.h> 60 #include <sys/mount.h> 61 #include <sys/proc.h> 62 #include <sys/select.h> 63 #include <sys/vnode.h> 64 #include <sys/kauth.h> 65 66 #include <miscfs/genfs/genfs.h> 67 68 #include <coda/coda.h> 69 #include <coda/cnode.h> 70 #include <coda/coda_vnops.h> 71 #include <coda/coda_venus.h> 72 #include <coda/coda_opstats.h> 73 #include <coda/coda_subr.h> 74 #include <coda/coda_namecache.h> 75 #include <coda/coda_pioctl.h> 76 77 /* 78 * These flags select various performance enhancements. 79 */ 80 int coda_attr_cache = 1; /* Set to cache attributes in the kernel */ 81 int coda_symlink_cache = 1; /* Set to cache symbolic link information */ 82 int coda_access_cache = 1; /* Set to handle some access checks directly */ 83 84 /* structure to keep track of vfs calls */ 85 86 struct coda_op_stats coda_vnodeopstats[CODA_VNODEOPS_SIZE]; 87 88 #define MARK_ENTRY(op) (coda_vnodeopstats[op].entries++) 89 #define MARK_INT_SAT(op) (coda_vnodeopstats[op].sat_intrn++) 90 #define MARK_INT_FAIL(op) (coda_vnodeopstats[op].unsat_intrn++) 91 #define MARK_INT_GEN(op) (coda_vnodeopstats[op].gen_intrn++) 92 93 /* What we are delaying for in printf */ 94 static int coda_lockdebug = 0; 95 96 #define ENTRY if(coda_vnop_print_entry) myprintf(("Entered %s\n",__func__)) 97 98 /* Definition of the vnode operation vector */ 99 100 const struct vnodeopv_entry_desc coda_vnodeop_entries[] = { 101 { &vop_default_desc, coda_vop_error }, 102 { &vop_lookup_desc, coda_lookup }, /* lookup */ 103 { &vop_create_desc, coda_create }, /* create */ 104 { &vop_mknod_desc, coda_vop_error }, /* mknod */ 105 { &vop_open_desc, coda_open }, /* open */ 106 { &vop_close_desc, coda_close }, /* close */ 107 { &vop_access_desc, coda_access }, /* access */ 108 { &vop_getattr_desc, coda_getattr }, /* getattr */ 109 { &vop_setattr_desc, coda_setattr }, /* setattr */ 110 { &vop_read_desc, coda_read }, /* read */ 111 { &vop_write_desc, coda_write }, /* write */ 112 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 113 { &vop_ioctl_desc, coda_ioctl }, /* ioctl */ 114 { &vop_mmap_desc, genfs_mmap }, /* mmap */ 115 { &vop_fsync_desc, coda_fsync }, /* fsync */ 116 { &vop_remove_desc, coda_remove }, /* remove */ 117 { &vop_link_desc, coda_link }, /* link */ 118 { &vop_rename_desc, coda_rename }, /* rename */ 119 { &vop_mkdir_desc, coda_mkdir }, /* mkdir */ 120 { &vop_rmdir_desc, coda_rmdir }, /* rmdir */ 121 { &vop_symlink_desc, coda_symlink }, /* symlink */ 122 { &vop_readdir_desc, coda_readdir }, /* readdir */ 123 { &vop_readlink_desc, coda_readlink }, /* readlink */ 124 { &vop_abortop_desc, coda_abortop }, /* abortop */ 125 { &vop_inactive_desc, coda_inactive }, /* inactive */ 126 { &vop_reclaim_desc, coda_reclaim }, /* reclaim */ 127 { &vop_lock_desc, coda_lock }, /* lock */ 128 { &vop_unlock_desc, coda_unlock }, /* unlock */ 129 { &vop_bmap_desc, coda_bmap }, /* bmap */ 130 { &vop_strategy_desc, coda_strategy }, /* strategy */ 131 { &vop_print_desc, coda_vop_error }, /* print */ 132 { &vop_islocked_desc, coda_islocked }, /* islocked */ 133 { &vop_pathconf_desc, coda_vop_error }, /* pathconf */ 134 { &vop_advlock_desc, coda_vop_nop }, /* advlock */ 135 { &vop_bwrite_desc, coda_vop_error }, /* bwrite */ 136 { &vop_seek_desc, genfs_seek }, /* seek */ 137 { &vop_poll_desc, genfs_poll }, /* poll */ 138 { &vop_getpages_desc, coda_getpages }, /* getpages */ 139 { &vop_putpages_desc, coda_putpages }, /* putpages */ 140 { NULL, NULL } 141 }; 142 143 const struct vnodeopv_desc coda_vnodeop_opv_desc = 144 { &coda_vnodeop_p, coda_vnodeop_entries }; 145 146 /* Definitions of NetBSD vnodeop interfaces */ 147 148 /* 149 * A generic error routine. Return EIO without looking at arguments. 150 */ 151 int 152 coda_vop_error(void *anon) { 153 struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; 154 155 if (codadebug) { 156 myprintf(("%s: Vnode operation %s called (error).\n", 157 __func__, (*desc)->vdesc_name)); 158 } 159 160 return EIO; 161 } 162 163 /* A generic do-nothing. */ 164 int 165 coda_vop_nop(void *anon) { 166 struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; 167 168 if (codadebug) { 169 myprintf(("Vnode operation %s called, but unsupported\n", 170 (*desc)->vdesc_name)); 171 } 172 return (0); 173 } 174 175 int 176 coda_vnodeopstats_init(void) 177 { 178 int i; 179 180 for(i=0;i<CODA_VNODEOPS_SIZE;i++) { 181 coda_vnodeopstats[i].opcode = i; 182 coda_vnodeopstats[i].entries = 0; 183 coda_vnodeopstats[i].sat_intrn = 0; 184 coda_vnodeopstats[i].unsat_intrn = 0; 185 coda_vnodeopstats[i].gen_intrn = 0; 186 } 187 188 return 0; 189 } 190 191 /* 192 * XXX The entire relationship between VOP_OPEN and having a container 193 * file (via venus_open) needs to be reexamined. In particular, it's 194 * valid to open/mmap/close and then reference. Instead of doing 195 * VOP_OPEN when getpages needs a container, we should do the 196 * venus_open part, and record that the vnode has opened the container 197 * for getpages, and do the matching logical close on coda_inactive. 198 * Further, coda_rdwr needs a container file, and sometimes needs to 199 * do the equivalent of open (core dumps). 200 */ 201 /* 202 * coda_open calls Venus to return the device and inode of the 203 * container file, and then obtains a vnode for that file. The 204 * container vnode is stored in the coda vnode, and a reference is 205 * added for each open file. 206 */ 207 int 208 coda_open(void *v) 209 { 210 /* 211 * NetBSD can pass the O_EXCL flag in mode, even though the check 212 * has already happened. Venus defensively assumes that if open 213 * is passed the EXCL, it must be a bug. We strip the flag here. 214 */ 215 /* true args */ 216 struct vop_open_args *ap = v; 217 vnode_t *vp = ap->a_vp; 218 struct cnode *cp = VTOC(vp); 219 int flag = ap->a_mode & (~O_EXCL); 220 kauth_cred_t cred = ap->a_cred; 221 /* locals */ 222 int error; 223 dev_t dev; /* container file device, inode, vnode */ 224 ino_t inode; 225 vnode_t *container_vp; 226 227 MARK_ENTRY(CODA_OPEN_STATS); 228 229 /* Check for open of control file. */ 230 if (IS_CTL_VP(vp)) { 231 /* if (WRITABLE(flag)) */ 232 if (flag & (FWRITE | O_TRUNC | O_CREAT | O_EXCL)) { 233 MARK_INT_FAIL(CODA_OPEN_STATS); 234 return(EACCES); 235 } 236 MARK_INT_SAT(CODA_OPEN_STATS); 237 return(0); 238 } 239 240 error = venus_open(vtomi(vp), &cp->c_fid, flag, cred, curlwp, &dev, &inode); 241 if (error) 242 return (error); 243 if (!error) { 244 CODADEBUG(CODA_OPEN, myprintf(( 245 "%s: dev 0x%llx inode %llu result %d\n", __func__, 246 (unsigned long long)dev, (unsigned long long)inode, error));) 247 } 248 249 /* 250 * Obtain locked and referenced container vnode from container 251 * device/inode. 252 */ 253 error = coda_grab_vnode(vp, dev, inode, &container_vp); 254 if (error) 255 return (error); 256 257 /* Save the vnode pointer for the container file. */ 258 if (cp->c_ovp == NULL) { 259 cp->c_ovp = container_vp; 260 } else { 261 if (cp->c_ovp != container_vp) 262 /* 263 * Perhaps venus returned a different container, or 264 * something else went wrong. 265 */ 266 panic("%s: cp->c_ovp != container_vp", __func__); 267 } 268 cp->c_ocount++; 269 270 /* Flush the attribute cache if writing the file. */ 271 if (flag & FWRITE) { 272 cp->c_owrite++; 273 cp->c_flags &= ~C_VATTR; 274 } 275 276 /* 277 * Save the <device, inode> pair for the container file to speed 278 * up subsequent reads while closed (mmap, program execution). 279 * This is perhaps safe because venus will invalidate the node 280 * before changing the container file mapping. 281 */ 282 cp->c_device = dev; 283 cp->c_inode = inode; 284 285 /* Open the container file. */ 286 error = VOP_OPEN(container_vp, flag, cred); 287 /* 288 * Drop the lock on the container, after we have done VOP_OPEN 289 * (which requires a locked vnode). 290 */ 291 VOP_UNLOCK(container_vp); 292 return(error); 293 } 294 295 /* 296 * Close the cache file used for I/O and notify Venus. 297 */ 298 int 299 coda_close(void *v) 300 { 301 /* true args */ 302 struct vop_close_args *ap = v; 303 vnode_t *vp = ap->a_vp; 304 struct cnode *cp = VTOC(vp); 305 int flag = ap->a_fflag; 306 kauth_cred_t cred = ap->a_cred; 307 /* locals */ 308 int error; 309 310 MARK_ENTRY(CODA_CLOSE_STATS); 311 312 /* Check for close of control file. */ 313 if (IS_CTL_VP(vp)) { 314 MARK_INT_SAT(CODA_CLOSE_STATS); 315 return(0); 316 } 317 318 /* 319 * XXX The IS_UNMOUNTING part of this is very suspect. 320 */ 321 if (IS_UNMOUNTING(cp)) { 322 if (cp->c_ovp) { 323 #ifdef CODA_VERBOSE 324 printf("%s: destroying container %d, ufs vp %p of vp %p/cp %p\n", 325 __func__, vp->v_usecount, cp->c_ovp, vp, cp); 326 #endif 327 #ifdef hmm 328 vgone(cp->c_ovp); 329 #else 330 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 331 VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ 332 vput(cp->c_ovp); 333 #endif 334 } else { 335 #ifdef CODA_VERBOSE 336 printf("%s: NO container vp %p/cp %p\n", __func__, vp, cp); 337 #endif 338 } 339 return ENODEV; 340 } 341 342 /* Lock the container node, and VOP_CLOSE it. */ 343 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 344 VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ 345 /* 346 * Drop the lock we just obtained, and vrele the container vnode. 347 * Decrement reference counts, and clear container vnode pointer on 348 * last close. 349 */ 350 vput(cp->c_ovp); 351 if (flag & FWRITE) 352 --cp->c_owrite; 353 if (--cp->c_ocount == 0) 354 cp->c_ovp = NULL; 355 356 error = venus_close(vtomi(vp), &cp->c_fid, flag, cred, curlwp); 357 358 CODADEBUG(CODA_CLOSE, myprintf(("%s: result %d\n", __func__, error)); ) 359 return(error); 360 } 361 362 int 363 coda_read(void *v) 364 { 365 struct vop_read_args *ap = v; 366 367 ENTRY; 368 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_READ, 369 ap->a_ioflag, ap->a_cred, curlwp)); 370 } 371 372 int 373 coda_write(void *v) 374 { 375 struct vop_write_args *ap = v; 376 377 ENTRY; 378 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_WRITE, 379 ap->a_ioflag, ap->a_cred, curlwp)); 380 } 381 382 int 383 coda_rdwr(vnode_t *vp, struct uio *uiop, enum uio_rw rw, int ioflag, 384 kauth_cred_t cred, struct lwp *l) 385 { 386 /* upcall decl */ 387 /* NOTE: container file operation!!! */ 388 /* locals */ 389 struct cnode *cp = VTOC(vp); 390 vnode_t *cfvp = cp->c_ovp; 391 struct proc *p = l->l_proc; 392 int opened_internally = 0; 393 int error = 0; 394 395 MARK_ENTRY(CODA_RDWR_STATS); 396 397 CODADEBUG(CODA_RDWR, myprintf(("coda_rdwr(%d, %p, %lu, %lld)\n", rw, 398 uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, 399 (long long) uiop->uio_offset)); ) 400 401 /* Check for rdwr of control object. */ 402 if (IS_CTL_VP(vp)) { 403 MARK_INT_FAIL(CODA_RDWR_STATS); 404 return(EINVAL); 405 } 406 407 /* Redirect the request to UFS. */ 408 409 /* 410 * If file is not already open this must be a page 411 * {read,write} request. Iget the cache file's inode 412 * pointer if we still have its <device, inode> pair. 413 * Otherwise, we must do an internal open to derive the 414 * pair. 415 * XXX Integrate this into a coherent strategy for container 416 * file acquisition. 417 */ 418 if (cfvp == NULL) { 419 /* 420 * If we're dumping core, do the internal open. Otherwise 421 * venus won't have the correct size of the core when 422 * it's completely written. 423 */ 424 if (cp->c_inode != 0 && !(p && (p->p_acflag & ACORE))) { 425 #ifdef CODA_VERBOSE 426 printf("%s: grabbing container vnode, losing reference\n", 427 __func__); 428 #endif 429 /* Get locked and refed vnode. */ 430 error = coda_grab_vnode(vp, 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 #ifdef CODA_VERBOSE 443 printf("%s: internal VOP_OPEN\n", __func__); 444 #endif 445 opened_internally = 1; 446 MARK_INT_GEN(CODA_OPEN_STATS); 447 error = VOP_OPEN(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); 448 #ifdef CODA_VERBOSE 449 printf("%s: Internally Opening %p\n", __func__, vp); 450 #endif 451 if (error) { 452 MARK_INT_FAIL(CODA_RDWR_STATS); 453 return(error); 454 } 455 cfvp = cp->c_ovp; 456 } 457 } 458 459 /* Have UFS handle the call. */ 460 CODADEBUG(CODA_RDWR, myprintf(("%s: fid = %s, refcnt = %d\n", __func__, 461 coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount)); ) 462 463 if (rw == UIO_READ) { 464 error = VOP_READ(cfvp, uiop, ioflag, cred); 465 } else { 466 error = VOP_WRITE(cfvp, uiop, ioflag, cred); 467 } 468 469 if (error) 470 MARK_INT_FAIL(CODA_RDWR_STATS); 471 else 472 MARK_INT_SAT(CODA_RDWR_STATS); 473 474 /* Do an internal close if necessary. */ 475 if (opened_internally) { 476 MARK_INT_GEN(CODA_CLOSE_STATS); 477 (void)VOP_CLOSE(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); 478 } 479 480 /* Invalidate cached attributes if writing. */ 481 if (rw == UIO_WRITE) 482 cp->c_flags &= ~C_VATTR; 483 return(error); 484 } 485 486 int 487 coda_ioctl(void *v) 488 { 489 /* true args */ 490 struct vop_ioctl_args *ap = v; 491 vnode_t *vp = ap->a_vp; 492 int com = ap->a_command; 493 void *data = ap->a_data; 494 int flag = ap->a_fflag; 495 kauth_cred_t cred = ap->a_cred; 496 /* locals */ 497 int error; 498 vnode_t *tvp; 499 struct PioctlData *iap = (struct PioctlData *)data; 500 namei_simple_flags_t sflags; 501 502 MARK_ENTRY(CODA_IOCTL_STATS); 503 504 CODADEBUG(CODA_IOCTL, myprintf(("in coda_ioctl on %s\n", iap->path));) 505 506 /* Don't check for operation on a dying object, for ctlvp it 507 shouldn't matter */ 508 509 /* Must be control object to succeed. */ 510 if (!IS_CTL_VP(vp)) { 511 MARK_INT_FAIL(CODA_IOCTL_STATS); 512 CODADEBUG(CODA_IOCTL, myprintf(("%s error: vp != ctlvp", __func__));) 513 return (EOPNOTSUPP); 514 } 515 /* Look up the pathname. */ 516 517 /* Should we use the name cache here? It would get it from 518 lookupname sooner or later anyway, right? */ 519 520 sflags = iap->follow ? NSM_FOLLOW_NOEMULROOT : NSM_NOFOLLOW_NOEMULROOT; 521 error = namei_simple_user(iap->path, sflags, &tvp); 522 523 if (error) { 524 MARK_INT_FAIL(CODA_IOCTL_STATS); 525 CODADEBUG(CODA_IOCTL, myprintf(("%s error: lookup returns %d\n", 526 __func__, error));) 527 return(error); 528 } 529 530 /* 531 * Make sure this is a coda style cnode, but it may be a 532 * different vfsp 533 */ 534 /* XXX: this totally violates the comment about vtagtype in vnode.h */ 535 if (tvp->v_tag != VT_CODA) { 536 vrele(tvp); 537 MARK_INT_FAIL(CODA_IOCTL_STATS); 538 CODADEBUG(CODA_IOCTL, myprintf(("%s error: %s not a coda object\n", 539 __func__, iap->path));) 540 return(EINVAL); 541 } 542 543 if (iap->vi.in_size > VC_MAXDATASIZE || iap->vi.out_size > VC_MAXDATASIZE) { 544 vrele(tvp); 545 return(EINVAL); 546 } 547 error = venus_ioctl(vtomi(tvp), &((VTOC(tvp))->c_fid), com, flag, data, 548 cred, curlwp); 549 550 if (error) 551 MARK_INT_FAIL(CODA_IOCTL_STATS); 552 else 553 CODADEBUG(CODA_IOCTL, myprintf(("Ioctl returns %d \n", error)); ) 554 555 vrele(tvp); 556 return(error); 557 } 558 559 /* 560 * To reduce the cost of a user-level venus;we cache attributes in 561 * the kernel. Each cnode has storage allocated for an attribute. If 562 * c_vattr is valid, return a reference to it. Otherwise, get the 563 * attributes from venus and store them in the cnode. There is some 564 * question if this method is a security leak. But I think that in 565 * order to make this call, the user must have done a lookup and 566 * opened the file, and therefore should already have access. 567 */ 568 int 569 coda_getattr(void *v) 570 { 571 /* true args */ 572 struct vop_getattr_args *ap = v; 573 vnode_t *vp = ap->a_vp; 574 struct cnode *cp = VTOC(vp); 575 struct vattr *vap = ap->a_vap; 576 kauth_cred_t cred = ap->a_cred; 577 /* locals */ 578 int error; 579 580 MARK_ENTRY(CODA_GETATTR_STATS); 581 582 /* Check for getattr of control object. */ 583 if (IS_CTL_VP(vp)) { 584 MARK_INT_FAIL(CODA_GETATTR_STATS); 585 return(ENOENT); 586 } 587 588 /* Check to see if the attributes have already been cached */ 589 if (VALID_VATTR(cp)) { 590 CODADEBUG(CODA_GETATTR, { myprintf(("%s: attr cache hit: %s\n", 591 __func__, coda_f2s(&cp->c_fid)));}) 592 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 593 print_vattr(&cp->c_vattr); ) 594 595 *vap = cp->c_vattr; 596 MARK_INT_SAT(CODA_GETATTR_STATS); 597 return(0); 598 } 599 600 error = venus_getattr(vtomi(vp), &cp->c_fid, cred, curlwp, vap); 601 602 if (!error) { 603 CODADEBUG(CODA_GETATTR, myprintf(("%s miss %s: result %d\n", 604 __func__, coda_f2s(&cp->c_fid), error)); ) 605 606 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 607 print_vattr(vap); ) 608 609 /* If not open for write, store attributes in cnode */ 610 if ((cp->c_owrite == 0) && (coda_attr_cache)) { 611 cp->c_vattr = *vap; 612 cp->c_flags |= C_VATTR; 613 } 614 615 } 616 return(error); 617 } 618 619 int 620 coda_setattr(void *v) 621 { 622 /* true args */ 623 struct vop_setattr_args *ap = v; 624 vnode_t *vp = ap->a_vp; 625 struct cnode *cp = VTOC(vp); 626 struct vattr *vap = ap->a_vap; 627 kauth_cred_t cred = ap->a_cred; 628 /* locals */ 629 int error; 630 631 MARK_ENTRY(CODA_SETATTR_STATS); 632 633 /* Check for setattr of control object. */ 634 if (IS_CTL_VP(vp)) { 635 MARK_INT_FAIL(CODA_SETATTR_STATS); 636 return(ENOENT); 637 } 638 639 if (codadebug & CODADBGMSK(CODA_SETATTR)) { 640 print_vattr(vap); 641 } 642 error = venus_setattr(vtomi(vp), &cp->c_fid, vap, cred, curlwp); 643 644 if (!error) 645 cp->c_flags &= ~C_VATTR; 646 647 CODADEBUG(CODA_SETATTR, myprintf(("setattr %d\n", error)); ) 648 return(error); 649 } 650 651 int 652 coda_access(void *v) 653 { 654 /* true args */ 655 struct vop_access_args *ap = v; 656 vnode_t *vp = ap->a_vp; 657 struct cnode *cp = VTOC(vp); 658 int mode = ap->a_mode; 659 kauth_cred_t cred = ap->a_cred; 660 /* locals */ 661 int error; 662 663 MARK_ENTRY(CODA_ACCESS_STATS); 664 665 /* Check for access of control object. Only read access is 666 allowed on it. */ 667 if (IS_CTL_VP(vp)) { 668 /* bogus hack - all will be marked as successes */ 669 MARK_INT_SAT(CODA_ACCESS_STATS); 670 return(((mode & VREAD) && !(mode & (VWRITE | VEXEC))) 671 ? 0 : EACCES); 672 } 673 674 /* 675 * if the file is a directory, and we are checking exec (eg lookup) 676 * access, and the file is in the namecache, then the user must have 677 * lookup access to it. 678 */ 679 if (coda_access_cache) { 680 if ((vp->v_type == VDIR) && (mode & VEXEC)) { 681 if (coda_nc_lookup(cp, ".", 1, cred)) { 682 MARK_INT_SAT(CODA_ACCESS_STATS); 683 return(0); /* it was in the cache */ 684 } 685 } 686 } 687 688 error = venus_access(vtomi(vp), &cp->c_fid, mode, cred, curlwp); 689 690 return(error); 691 } 692 693 /* 694 * CODA abort op, called after namei() when a CREATE/DELETE isn't actually 695 * done. If a buffer has been saved in anticipation of a coda_create or 696 * a coda_remove, delete it. 697 */ 698 /* ARGSUSED */ 699 int 700 coda_abortop(void *v) 701 { 702 /* true args */ 703 struct vop_abortop_args /* { 704 vnode_t *a_dvp; 705 struct componentname *a_cnp; 706 } */ *ap = v; 707 708 (void)ap; 709 /* upcall decl */ 710 /* locals */ 711 712 return (0); 713 } 714 715 int 716 coda_readlink(void *v) 717 { 718 /* true args */ 719 struct vop_readlink_args *ap = v; 720 vnode_t *vp = ap->a_vp; 721 struct cnode *cp = VTOC(vp); 722 struct uio *uiop = ap->a_uio; 723 kauth_cred_t cred = ap->a_cred; 724 /* locals */ 725 struct lwp *l = curlwp; 726 int error; 727 char *str; 728 int len; 729 730 MARK_ENTRY(CODA_READLINK_STATS); 731 732 /* Check for readlink of control object. */ 733 if (IS_CTL_VP(vp)) { 734 MARK_INT_FAIL(CODA_READLINK_STATS); 735 return(ENOENT); 736 } 737 738 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { /* symlink was cached */ 739 uiop->uio_rw = UIO_READ; 740 error = uiomove(cp->c_symlink, (int)cp->c_symlen, uiop); 741 if (error) 742 MARK_INT_FAIL(CODA_READLINK_STATS); 743 else 744 MARK_INT_SAT(CODA_READLINK_STATS); 745 return(error); 746 } 747 748 error = venus_readlink(vtomi(vp), &cp->c_fid, cred, l, &str, &len); 749 750 if (!error) { 751 uiop->uio_rw = UIO_READ; 752 error = uiomove(str, len, uiop); 753 754 if (coda_symlink_cache) { 755 cp->c_symlink = str; 756 cp->c_symlen = len; 757 cp->c_flags |= C_SYMLINK; 758 } else 759 CODA_FREE(str, len); 760 } 761 762 CODADEBUG(CODA_READLINK, myprintf(("in readlink result %d\n",error));) 763 return(error); 764 } 765 766 int 767 coda_fsync(void *v) 768 { 769 /* true args */ 770 struct vop_fsync_args *ap = v; 771 vnode_t *vp = ap->a_vp; 772 struct cnode *cp = VTOC(vp); 773 kauth_cred_t cred = ap->a_cred; 774 /* locals */ 775 vnode_t *convp = cp->c_ovp; 776 int error; 777 778 MARK_ENTRY(CODA_FSYNC_STATS); 779 780 /* Check for fsync on an unmounting object */ 781 /* The NetBSD kernel, in it's infinite wisdom, can try to fsync 782 * after an unmount has been initiated. This is a Bad Thing, 783 * which we have to avoid. Not a legitimate failure for stats. 784 */ 785 if (IS_UNMOUNTING(cp)) { 786 return(ENODEV); 787 } 788 789 /* Check for fsync of control object. */ 790 if (IS_CTL_VP(vp)) { 791 MARK_INT_SAT(CODA_FSYNC_STATS); 792 return(0); 793 } 794 795 if (convp) 796 VOP_FSYNC(convp, cred, MNT_WAIT, 0, 0); 797 798 /* 799 * We can expect fsync on any vnode at all if venus is pruging it. 800 * Venus can't very well answer the fsync request, now can it? 801 * Hopefully, it won't have to, because hopefully, venus preserves 802 * the (possibly untrue) invariant that it never purges an open 803 * vnode. Hopefully. 804 */ 805 if (cp->c_flags & C_PURGING) { 806 return(0); 807 } 808 809 error = venus_fsync(vtomi(vp), &cp->c_fid, cred, curlwp); 810 811 CODADEBUG(CODA_FSYNC, myprintf(("in fsync result %d\n",error)); ) 812 return(error); 813 } 814 815 /* 816 * vp is locked on entry, and we must unlock it. 817 * XXX This routine is suspect and probably needs rewriting. 818 */ 819 int 820 coda_inactive(void *v) 821 { 822 /* true args */ 823 struct vop_inactive_args *ap = v; 824 vnode_t *vp = ap->a_vp; 825 struct cnode *cp = VTOC(vp); 826 kauth_cred_t cred __unused = NULL; 827 828 /* We don't need to send inactive to venus - DCS */ 829 MARK_ENTRY(CODA_INACTIVE_STATS); 830 831 if (IS_CTL_VP(vp)) { 832 MARK_INT_SAT(CODA_INACTIVE_STATS); 833 return 0; 834 } 835 836 CODADEBUG(CODA_INACTIVE, myprintf(("in inactive, %s, vfsp %p\n", 837 coda_f2s(&cp->c_fid), vp->v_mount));) 838 839 /* If an array has been allocated to hold the symlink, deallocate it */ 840 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { 841 if (cp->c_symlink == NULL) 842 panic("%s: null symlink pointer in cnode", __func__); 843 844 CODA_FREE(cp->c_symlink, cp->c_symlen); 845 cp->c_flags &= ~C_SYMLINK; 846 cp->c_symlen = 0; 847 } 848 849 /* Remove it from the table so it can't be found. */ 850 coda_unsave(cp); 851 if (vp->v_mount->mnt_data == NULL) { 852 myprintf(("Help! vfsp->vfs_data was NULL, but vnode %p wasn't dying\n", vp)); 853 panic("badness in coda_inactive"); 854 } 855 856 #ifdef CODA_VERBOSE 857 /* Sanity checks that perhaps should be panic. */ 858 if (vp->v_usecount > 1) 859 printf("%s: %p usecount %d\n", __func__, vp, vp->v_usecount); 860 if (cp->c_ovp != NULL) 861 printf("%s: %p ovp != NULL\n", __func__, vp); 862 #endif 863 /* XXX Do we need to VOP_CLOSE container vnodes? */ 864 VOP_UNLOCK(vp); 865 if (!IS_UNMOUNTING(cp)) 866 *ap->a_recycle = true; 867 868 MARK_INT_SAT(CODA_INACTIVE_STATS); 869 return(0); 870 } 871 872 /* 873 * Coda does not use the normal namecache, but a private version. 874 * Consider how to use the standard facility instead. 875 */ 876 int 877 coda_lookup(void *v) 878 { 879 /* true args */ 880 struct vop_lookup_args *ap = v; 881 /* (locked) vnode of dir in which to do lookup */ 882 vnode_t *dvp = ap->a_dvp; 883 struct cnode *dcp = VTOC(dvp); 884 /* output variable for result */ 885 vnode_t **vpp = ap->a_vpp; 886 /* name to lookup */ 887 struct componentname *cnp = ap->a_cnp; 888 kauth_cred_t cred = cnp->cn_cred; 889 struct lwp *l = curlwp; 890 /* locals */ 891 struct cnode *cp; 892 const char *nm = cnp->cn_nameptr; 893 int len = cnp->cn_namelen; 894 int flags = cnp->cn_flags; 895 int isdot; 896 CodaFid VFid; 897 int vtype; 898 int error = 0; 899 900 MARK_ENTRY(CODA_LOOKUP_STATS); 901 902 CODADEBUG(CODA_LOOKUP, myprintf(("%s: %s in %s\n", __func__, 903 nm, coda_f2s(&dcp->c_fid)));) 904 905 /* 906 * XXX componentname flags in MODMASK are not handled at all 907 */ 908 909 /* 910 * The overall strategy is to switch on the lookup type and get a 911 * result vnode that is vref'd but not locked. Then, the code at 912 * exit: switches on ., .., and regular lookups and does the right 913 * locking. 914 */ 915 916 /* Check for lookup of control object. */ 917 if (IS_CTL_NAME(dvp, nm, len)) { 918 *vpp = coda_ctlvp; 919 vref(*vpp); 920 MARK_INT_SAT(CODA_LOOKUP_STATS); 921 goto exit; 922 } 923 924 /* Avoid trying to hand venus an unreasonably long name. */ 925 if (len+1 > CODA_MAXNAMLEN) { 926 MARK_INT_FAIL(CODA_LOOKUP_STATS); 927 CODADEBUG(CODA_LOOKUP, myprintf(("%s: name too long:, %s (%s)\n", 928 __func__, coda_f2s(&dcp->c_fid), nm));) 929 *vpp = (vnode_t *)0; 930 error = EINVAL; 931 goto exit; 932 } 933 934 /* 935 * XXX Check for DOT lookups, and short circuit all the caches, 936 * just doing an extra vref. (venus guarantees that lookup of 937 * . returns self.) 938 */ 939 isdot = (len == 1 && nm[0] == '.'); 940 941 /* 942 * Try to resolve the lookup in the minicache. If that fails, ask 943 * venus to do the lookup. XXX The interaction between vnode 944 * locking and any locking that coda does is not clear. 945 */ 946 cp = coda_nc_lookup(dcp, nm, len, cred); 947 if (cp) { 948 *vpp = CTOV(cp); 949 vref(*vpp); 950 CODADEBUG(CODA_LOOKUP, 951 myprintf(("lookup result %d vpp %p\n",error,*vpp));) 952 } else { 953 /* The name wasn't cached, so ask Venus. */ 954 error = venus_lookup(vtomi(dvp), &dcp->c_fid, nm, len, cred, l, &VFid, 955 &vtype); 956 957 if (error) { 958 MARK_INT_FAIL(CODA_LOOKUP_STATS); 959 CODADEBUG(CODA_LOOKUP, myprintf(("%s: lookup error on %s (%s)%d\n", 960 __func__, coda_f2s(&dcp->c_fid), nm, error));) 961 *vpp = (vnode_t *)0; 962 } else { 963 MARK_INT_SAT(CODA_LOOKUP_STATS); 964 CODADEBUG(CODA_LOOKUP, myprintf(("%s: %s type %o result %d\n", 965 __func__, coda_f2s(&VFid), vtype, error)); ) 966 967 cp = make_coda_node(&VFid, dvp->v_mount, vtype); 968 *vpp = CTOV(cp); 969 /* vpp is now vrefed. */ 970 971 /* 972 * Unless this vnode is marked CODA_NOCACHE, enter it into 973 * the coda name cache to avoid a future venus round-trip. 974 * XXX Interaction with componentname NOCACHE is unclear. 975 */ 976 if (!(vtype & CODA_NOCACHE)) 977 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 978 } 979 } 980 981 exit: 982 /* 983 * If we are creating, and this was the last name to be looked up, 984 * and the error was ENOENT, then make the leaf NULL and return 985 * success. 986 * XXX Check against new lookup rules. 987 */ 988 if (((cnp->cn_nameiop == CREATE) || (cnp->cn_nameiop == RENAME)) 989 && (cnp->cn_flags & ISLASTCN) 990 && (error == ENOENT)) 991 { 992 error = EJUSTRETURN; 993 *ap->a_vpp = NULL; 994 } 995 996 /* 997 * If the lookup succeeded, we must generally lock the returned 998 * vnode. This could be a ., .., or normal lookup. See 999 * vnodeops(9) for the details. 1000 */ 1001 /* 1002 * XXX LK_RETRY is likely incorrect. Handle vn_lock failure 1003 * somehow, and remove LK_RETRY. 1004 */ 1005 if (!error || (error == EJUSTRETURN)) { 1006 /* Lookup has a value and it isn't "."? */ 1007 if (*ap->a_vpp && (*ap->a_vpp != dvp)) { 1008 if (flags & ISDOTDOT) 1009 /* ..: unlock parent */ 1010 VOP_UNLOCK(dvp); 1011 /* all but .: lock child */ 1012 vn_lock(*ap->a_vpp, LK_EXCLUSIVE | LK_RETRY); 1013 if (flags & ISDOTDOT) 1014 /* ..: relock parent */ 1015 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1016 } 1017 /* else .: leave dvp locked */ 1018 } else { 1019 /* The lookup failed, so return NULL. Leave dvp locked. */ 1020 *ap->a_vpp = NULL; 1021 } 1022 return(error); 1023 } 1024 1025 /*ARGSUSED*/ 1026 int 1027 coda_create(void *v) 1028 { 1029 /* true args */ 1030 struct vop_create_args *ap = v; 1031 vnode_t *dvp = ap->a_dvp; 1032 struct cnode *dcp = VTOC(dvp); 1033 struct vattr *va = ap->a_vap; 1034 int exclusive = 1; 1035 int mode = ap->a_vap->va_mode; 1036 vnode_t **vpp = ap->a_vpp; 1037 struct componentname *cnp = ap->a_cnp; 1038 kauth_cred_t cred = cnp->cn_cred; 1039 struct lwp *l = curlwp; 1040 /* locals */ 1041 int error; 1042 struct cnode *cp; 1043 const char *nm = cnp->cn_nameptr; 1044 int len = cnp->cn_namelen; 1045 CodaFid VFid; 1046 struct vattr attr; 1047 1048 MARK_ENTRY(CODA_CREATE_STATS); 1049 1050 /* All creates are exclusive XXX */ 1051 /* I'm assuming the 'mode' argument is the file mode bits XXX */ 1052 1053 /* Check for create of control object. */ 1054 if (IS_CTL_NAME(dvp, nm, len)) { 1055 *vpp = (vnode_t *)0; 1056 MARK_INT_FAIL(CODA_CREATE_STATS); 1057 return(EACCES); 1058 } 1059 1060 error = venus_create(vtomi(dvp), &dcp->c_fid, nm, len, exclusive, mode, va, cred, l, &VFid, &attr); 1061 1062 if (!error) { 1063 1064 /* 1065 * XXX Violation of venus/kernel invariants is a difficult case, 1066 * but venus should not be able to cause a panic. 1067 */ 1068 /* If this is an exclusive create, panic if the file already exists. */ 1069 /* Venus should have detected the file and reported EEXIST. */ 1070 1071 if ((exclusive == 1) && 1072 (coda_find(&VFid) != NULL)) 1073 panic("cnode existed for newly created file!"); 1074 1075 cp = make_coda_node(&VFid, dvp->v_mount, attr.va_type); 1076 *vpp = CTOV(cp); 1077 1078 /* XXX vnodeops doesn't say this argument can be changed. */ 1079 /* Update va to reflect the new attributes. */ 1080 (*va) = attr; 1081 1082 /* Update the attribute cache and mark it as valid */ 1083 if (coda_attr_cache) { 1084 VTOC(*vpp)->c_vattr = attr; 1085 VTOC(*vpp)->c_flags |= C_VATTR; 1086 } 1087 1088 /* Invalidate parent's attr cache (modification time has changed). */ 1089 VTOC(dvp)->c_flags &= ~C_VATTR; 1090 1091 /* enter the new vnode in the Name Cache */ 1092 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1093 1094 CODADEBUG(CODA_CREATE, myprintf(("%s: %s, result %d\n", __func__, 1095 coda_f2s(&VFid), error)); ) 1096 } else { 1097 *vpp = (vnode_t *)0; 1098 CODADEBUG(CODA_CREATE, myprintf(("%s: create error %d\n", __func__, 1099 error));) 1100 } 1101 1102 /* 1103 * vnodeops(9) says that we must unlock the parent and lock the child. 1104 * XXX Should we lock the child first? 1105 */ 1106 vput(dvp); 1107 if (!error) { 1108 #ifdef CODA_VERBOSE 1109 if ((cnp->cn_flags & LOCKLEAF) == 0) 1110 /* This should not happen; flags are for lookup only. */ 1111 printf("%s: LOCKLEAF not set!\n", __func__); 1112 1113 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) 1114 /* XXX Perhaps avoid this panic. */ 1115 panic("%s: couldn't lock child", __func__); 1116 #endif 1117 } 1118 1119 return(error); 1120 } 1121 1122 int 1123 coda_remove(void *v) 1124 { 1125 /* true args */ 1126 struct vop_remove_args *ap = v; 1127 vnode_t *dvp = ap->a_dvp; 1128 struct cnode *cp = VTOC(dvp); 1129 vnode_t *vp = ap->a_vp; 1130 struct componentname *cnp = ap->a_cnp; 1131 kauth_cred_t cred = cnp->cn_cred; 1132 struct lwp *l = curlwp; 1133 /* locals */ 1134 int error; 1135 const char *nm = cnp->cn_nameptr; 1136 int len = cnp->cn_namelen; 1137 struct cnode *tp; 1138 1139 MARK_ENTRY(CODA_REMOVE_STATS); 1140 1141 CODADEBUG(CODA_REMOVE, myprintf(("%s: %s in %s\n", __func__, 1142 nm, coda_f2s(&cp->c_fid)));) 1143 1144 /* Remove the file's entry from the CODA Name Cache */ 1145 /* We're being conservative here, it might be that this person 1146 * doesn't really have sufficient access to delete the file 1147 * but we feel zapping the entry won't really hurt anyone -- dcs 1148 */ 1149 /* I'm gonna go out on a limb here. If a file and a hardlink to it 1150 * exist, and one is removed, the link count on the other will be 1151 * off by 1. We could either invalidate the attrs if cached, or 1152 * fix them. I'll try to fix them. DCS 11/8/94 1153 */ 1154 tp = coda_nc_lookup(VTOC(dvp), nm, len, cred); 1155 if (tp) { 1156 if (VALID_VATTR(tp)) { /* If attrs are cached */ 1157 if (tp->c_vattr.va_nlink > 1) { /* If it's a hard link */ 1158 tp->c_vattr.va_nlink--; 1159 } 1160 } 1161 1162 coda_nc_zapfile(VTOC(dvp), nm, len); 1163 /* No need to flush it if it doesn't exist! */ 1164 } 1165 /* Invalidate the parent's attr cache, the modification time has changed */ 1166 VTOC(dvp)->c_flags &= ~C_VATTR; 1167 1168 /* Check for remove of control object. */ 1169 if (IS_CTL_NAME(dvp, nm, len)) { 1170 MARK_INT_FAIL(CODA_REMOVE_STATS); 1171 return(ENOENT); 1172 } 1173 1174 error = venus_remove(vtomi(dvp), &cp->c_fid, nm, len, cred, l); 1175 1176 CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n",error)); ) 1177 1178 /* 1179 * Unlock parent and child (avoiding double if "."). 1180 */ 1181 if (dvp == vp) { 1182 vrele(vp); 1183 } else { 1184 vput(vp); 1185 } 1186 vput(dvp); 1187 1188 return(error); 1189 } 1190 1191 /* 1192 * dvp is the directory where the link is to go, and is locked. 1193 * vp is the object to be linked to, and is unlocked. 1194 * At exit, we must unlock dvp, and vput dvp. 1195 */ 1196 int 1197 coda_link(void *v) 1198 { 1199 /* true args */ 1200 struct vop_link_args *ap = v; 1201 vnode_t *vp = ap->a_vp; 1202 struct cnode *cp = VTOC(vp); 1203 vnode_t *dvp = ap->a_dvp; 1204 struct cnode *dcp = VTOC(dvp); 1205 struct componentname *cnp = ap->a_cnp; 1206 kauth_cred_t cred = cnp->cn_cred; 1207 struct lwp *l = curlwp; 1208 /* locals */ 1209 int error; 1210 const char *nm = cnp->cn_nameptr; 1211 int len = cnp->cn_namelen; 1212 1213 MARK_ENTRY(CODA_LINK_STATS); 1214 1215 if (codadebug & CODADBGMSK(CODA_LINK)) { 1216 1217 myprintf(("%s: vp fid: %s\n", __func__, coda_f2s(&cp->c_fid))); 1218 myprintf(("%s: dvp fid: %s)\n", __func__, coda_f2s(&dcp->c_fid))); 1219 1220 } 1221 if (codadebug & CODADBGMSK(CODA_LINK)) { 1222 myprintf(("%s: vp fid: %s\n", __func__, coda_f2s(&cp->c_fid))); 1223 myprintf(("%s: dvp fid: %s\n", __func__, coda_f2s(&dcp->c_fid))); 1224 1225 } 1226 1227 /* Check for link to/from control object. */ 1228 if (IS_CTL_NAME(dvp, nm, len) || IS_CTL_VP(vp)) { 1229 MARK_INT_FAIL(CODA_LINK_STATS); 1230 return(EACCES); 1231 } 1232 1233 /* If linking . to a name, error out earlier. */ 1234 if (vp == dvp) { 1235 #ifdef CODA_VERBOSE 1236 printf("%s coda_link vp==dvp\n", __func__); 1237 #endif 1238 error = EISDIR; 1239 goto exit; 1240 } 1241 1242 /* XXX Why does venus_link need the vnode to be locked?*/ 1243 if ((error = vn_lock(vp, LK_EXCLUSIVE)) != 0) { 1244 #ifdef CODA_VERBOSE 1245 printf("%s: couldn't lock vnode %p\n", __func__, vp); 1246 #endif 1247 error = EFAULT; /* XXX better value */ 1248 goto exit; 1249 } 1250 error = venus_link(vtomi(vp), &cp->c_fid, &dcp->c_fid, nm, len, cred, l); 1251 VOP_UNLOCK(vp); 1252 1253 /* Invalidate parent's attr cache (the modification time has changed). */ 1254 VTOC(dvp)->c_flags &= ~C_VATTR; 1255 /* Invalidate child's attr cache (XXX why). */ 1256 VTOC(vp)->c_flags &= ~C_VATTR; 1257 1258 CODADEBUG(CODA_LINK, myprintf(("in link result %d\n",error)); ) 1259 1260 exit: 1261 vput(dvp); 1262 return(error); 1263 } 1264 1265 int 1266 coda_rename(void *v) 1267 { 1268 /* true args */ 1269 struct vop_rename_args *ap = v; 1270 vnode_t *odvp = ap->a_fdvp; 1271 struct cnode *odcp = VTOC(odvp); 1272 struct componentname *fcnp = ap->a_fcnp; 1273 vnode_t *ndvp = ap->a_tdvp; 1274 struct cnode *ndcp = VTOC(ndvp); 1275 struct componentname *tcnp = ap->a_tcnp; 1276 kauth_cred_t cred = fcnp->cn_cred; 1277 struct lwp *l = curlwp; 1278 /* true args */ 1279 int error; 1280 const char *fnm = fcnp->cn_nameptr; 1281 int flen = fcnp->cn_namelen; 1282 const char *tnm = tcnp->cn_nameptr; 1283 int tlen = tcnp->cn_namelen; 1284 1285 MARK_ENTRY(CODA_RENAME_STATS); 1286 1287 /* Hmmm. The vnodes are already looked up. Perhaps they are locked? 1288 This could be Bad. XXX */ 1289 #ifdef OLD_DIAGNOSTIC 1290 if ((fcnp->cn_cred != tcnp->cn_cred) 1291 || (fcnp->cn_lwp != tcnp->cn_lwp)) 1292 { 1293 panic("%s: component names don't agree", __func__); 1294 } 1295 #endif 1296 1297 /* Check for rename involving control object. */ 1298 if (IS_CTL_NAME(odvp, fnm, flen) || IS_CTL_NAME(ndvp, tnm, tlen)) { 1299 MARK_INT_FAIL(CODA_RENAME_STATS); 1300 return(EACCES); 1301 } 1302 1303 /* Problem with moving directories -- need to flush entry for .. */ 1304 if (odvp != ndvp) { 1305 struct cnode *ovcp = coda_nc_lookup(VTOC(odvp), fnm, flen, cred); 1306 if (ovcp) { 1307 vnode_t *ovp = CTOV(ovcp); 1308 if ((ovp) && 1309 (ovp->v_type == VDIR)) /* If it's a directory */ 1310 coda_nc_zapfile(VTOC(ovp),"..", 2); 1311 } 1312 } 1313 1314 /* Remove the entries for both source and target files */ 1315 coda_nc_zapfile(VTOC(odvp), fnm, flen); 1316 coda_nc_zapfile(VTOC(ndvp), tnm, tlen); 1317 1318 /* Invalidate the parent's attr cache, the modification time has changed */ 1319 VTOC(odvp)->c_flags &= ~C_VATTR; 1320 VTOC(ndvp)->c_flags &= ~C_VATTR; 1321 1322 if (flen+1 > CODA_MAXNAMLEN) { 1323 MARK_INT_FAIL(CODA_RENAME_STATS); 1324 error = EINVAL; 1325 goto exit; 1326 } 1327 1328 if (tlen+1 > CODA_MAXNAMLEN) { 1329 MARK_INT_FAIL(CODA_RENAME_STATS); 1330 error = EINVAL; 1331 goto exit; 1332 } 1333 1334 error = venus_rename(vtomi(odvp), &odcp->c_fid, &ndcp->c_fid, fnm, flen, tnm, tlen, cred, l); 1335 1336 exit: 1337 CODADEBUG(CODA_RENAME, myprintf(("in rename result %d\n",error));) 1338 /* XXX - do we need to call cache pureg on the moved vnode? */ 1339 cache_purge(ap->a_fvp); 1340 1341 /* It seems to be incumbent on us to drop locks on all four vnodes */ 1342 /* From-vnodes are not locked, only ref'd. To-vnodes are locked. */ 1343 1344 vrele(ap->a_fvp); 1345 vrele(odvp); 1346 1347 if (ap->a_tvp) { 1348 if (ap->a_tvp == ndvp) { 1349 vrele(ap->a_tvp); 1350 } else { 1351 vput(ap->a_tvp); 1352 } 1353 } 1354 1355 vput(ndvp); 1356 return(error); 1357 } 1358 1359 int 1360 coda_mkdir(void *v) 1361 { 1362 /* true args */ 1363 struct vop_mkdir_args *ap = v; 1364 vnode_t *dvp = ap->a_dvp; 1365 struct cnode *dcp = VTOC(dvp); 1366 struct componentname *cnp = ap->a_cnp; 1367 struct vattr *va = ap->a_vap; 1368 vnode_t **vpp = ap->a_vpp; 1369 kauth_cred_t cred = cnp->cn_cred; 1370 struct lwp *l = curlwp; 1371 /* locals */ 1372 int error; 1373 const char *nm = cnp->cn_nameptr; 1374 int len = cnp->cn_namelen; 1375 struct cnode *cp; 1376 CodaFid VFid; 1377 struct vattr ova; 1378 1379 MARK_ENTRY(CODA_MKDIR_STATS); 1380 1381 /* Check for mkdir of target object. */ 1382 if (IS_CTL_NAME(dvp, nm, len)) { 1383 *vpp = (vnode_t *)0; 1384 MARK_INT_FAIL(CODA_MKDIR_STATS); 1385 return(EACCES); 1386 } 1387 1388 if (len+1 > CODA_MAXNAMLEN) { 1389 *vpp = (vnode_t *)0; 1390 MARK_INT_FAIL(CODA_MKDIR_STATS); 1391 return(EACCES); 1392 } 1393 1394 error = venus_mkdir(vtomi(dvp), &dcp->c_fid, nm, len, va, cred, l, &VFid, &ova); 1395 1396 if (!error) { 1397 if (coda_find(&VFid) != NULL) 1398 panic("cnode existed for newly created directory!"); 1399 1400 1401 cp = make_coda_node(&VFid, dvp->v_mount, va->va_type); 1402 *vpp = CTOV(cp); 1403 1404 /* enter the new vnode in the Name Cache */ 1405 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1406 1407 /* as a side effect, enter "." and ".." for the directory */ 1408 coda_nc_enter(VTOC(*vpp), ".", 1, cred, VTOC(*vpp)); 1409 coda_nc_enter(VTOC(*vpp), "..", 2, cred, VTOC(dvp)); 1410 1411 if (coda_attr_cache) { 1412 VTOC(*vpp)->c_vattr = ova; /* update the attr cache */ 1413 VTOC(*vpp)->c_flags |= C_VATTR; /* Valid attributes in cnode */ 1414 } 1415 1416 /* Invalidate the parent's attr cache, the modification time has changed */ 1417 VTOC(dvp)->c_flags &= ~C_VATTR; 1418 1419 CODADEBUG( CODA_MKDIR, myprintf(("%s: %s result %d\n", __func__, 1420 coda_f2s(&VFid), error)); ) 1421 } else { 1422 *vpp = (vnode_t *)0; 1423 CODADEBUG(CODA_MKDIR, myprintf(("%s error %d\n", __func__, error));) 1424 } 1425 1426 /* 1427 * Currently, all mkdirs explicitly vput their dvp's. 1428 * It also appears that we *must* lock the vpp, since 1429 * lockleaf isn't set, but someone down the road is going 1430 * to try to unlock the new directory. 1431 */ 1432 vput(dvp); 1433 if (!error) { 1434 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { 1435 panic("%s: couldn't lock child", __func__); 1436 } 1437 } 1438 1439 return(error); 1440 } 1441 1442 int 1443 coda_rmdir(void *v) 1444 { 1445 /* true args */ 1446 struct vop_rmdir_args *ap = v; 1447 vnode_t *dvp = ap->a_dvp; 1448 struct cnode *dcp = VTOC(dvp); 1449 vnode_t *vp = ap->a_vp; 1450 struct componentname *cnp = ap->a_cnp; 1451 kauth_cred_t cred = cnp->cn_cred; 1452 struct lwp *l = curlwp; 1453 /* true args */ 1454 int error; 1455 const char *nm = cnp->cn_nameptr; 1456 int len = cnp->cn_namelen; 1457 struct cnode *cp; 1458 1459 MARK_ENTRY(CODA_RMDIR_STATS); 1460 1461 /* Check for rmdir of control object. */ 1462 if (IS_CTL_NAME(dvp, nm, len)) { 1463 MARK_INT_FAIL(CODA_RMDIR_STATS); 1464 return(ENOENT); 1465 } 1466 1467 /* Can't remove . in self. */ 1468 if (dvp == vp) { 1469 #ifdef CODA_VERBOSE 1470 printf("%s: dvp == vp\n", __func__); 1471 #endif 1472 error = EINVAL; 1473 goto exit; 1474 } 1475 1476 /* 1477 * The caller may not have adequate permissions, and the venus 1478 * operation may fail, but it doesn't hurt from a correctness 1479 * viewpoint to invalidate cache entries. 1480 * XXX Why isn't this done after the venus_rmdir call? 1481 */ 1482 /* Look up child in name cache (by name, from parent). */ 1483 cp = coda_nc_lookup(dcp, nm, len, cred); 1484 /* If found, remove all children of the child (., ..). */ 1485 if (cp) coda_nc_zapParentfid(&(cp->c_fid), NOT_DOWNCALL); 1486 1487 /* Remove child's own entry. */ 1488 coda_nc_zapfile(dcp, nm, len); 1489 1490 /* Invalidate parent's attr cache (the modification time has changed). */ 1491 dcp->c_flags &= ~C_VATTR; 1492 1493 error = venus_rmdir(vtomi(dvp), &dcp->c_fid, nm, len, cred, l); 1494 1495 CODADEBUG(CODA_RMDIR, myprintf(("in rmdir result %d\n", error)); ) 1496 1497 exit: 1498 /* vput both vnodes */ 1499 vput(dvp); 1500 if (dvp == vp) { 1501 vrele(vp); 1502 } else { 1503 vput(vp); 1504 } 1505 1506 return(error); 1507 } 1508 1509 int 1510 coda_symlink(void *v) 1511 { 1512 /* true args */ 1513 struct vop_symlink_args *ap = v; 1514 vnode_t *dvp = ap->a_dvp; 1515 struct cnode *dcp = VTOC(dvp); 1516 /* a_vpp is used in place below */ 1517 struct componentname *cnp = ap->a_cnp; 1518 struct vattr *tva = ap->a_vap; 1519 char *path = ap->a_target; 1520 kauth_cred_t cred = cnp->cn_cred; 1521 struct lwp *l = curlwp; 1522 /* locals */ 1523 int error; 1524 u_long saved_cn_flags; 1525 const char *nm = cnp->cn_nameptr; 1526 int len = cnp->cn_namelen; 1527 int plen = strlen(path); 1528 1529 /* 1530 * Here's the strategy for the moment: perform the symlink, then 1531 * do a lookup to grab the resulting vnode. I know this requires 1532 * two communications with Venus for a new sybolic link, but 1533 * that's the way the ball bounces. I don't yet want to change 1534 * the way the Mach symlink works. When Mach support is 1535 * deprecated, we should change symlink so that the common case 1536 * returns the resultant vnode in a vpp argument. 1537 */ 1538 1539 MARK_ENTRY(CODA_SYMLINK_STATS); 1540 1541 /* Check for symlink of control object. */ 1542 if (IS_CTL_NAME(dvp, nm, len)) { 1543 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1544 error = EACCES; 1545 goto exit; 1546 } 1547 1548 if (plen+1 > CODA_MAXPATHLEN) { 1549 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1550 error = EINVAL; 1551 goto exit; 1552 } 1553 1554 if (len+1 > CODA_MAXNAMLEN) { 1555 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1556 error = EINVAL; 1557 goto exit; 1558 } 1559 1560 error = venus_symlink(vtomi(dvp), &dcp->c_fid, path, plen, nm, len, tva, cred, l); 1561 1562 /* Invalidate the parent's attr cache (modification time has changed). */ 1563 dcp->c_flags &= ~C_VATTR; 1564 1565 if (!error) { 1566 /* 1567 * VOP_SYMLINK is not defined to pay attention to cnp->cn_flags; 1568 * these are defined only for VOP_LOOKUP. We desire to reuse 1569 * cnp for a VOP_LOOKUP operation, and must be sure to not pass 1570 * stray flags passed to us. Such stray flags can occur because 1571 * sys_symlink makes a namei call and then reuses the 1572 * componentname structure. 1573 */ 1574 /* 1575 * XXX Arguably we should create our own componentname structure 1576 * and not reuse the one that was passed in. 1577 */ 1578 saved_cn_flags = cnp->cn_flags; 1579 cnp->cn_flags &= ~(MODMASK | OPMASK); 1580 cnp->cn_flags |= LOOKUP; 1581 error = VOP_LOOKUP(dvp, ap->a_vpp, cnp); 1582 cnp->cn_flags = saved_cn_flags; 1583 /* Either an error occurs, or ap->a_vpp is locked. */ 1584 } 1585 1586 exit: 1587 /* unlock and deference parent */ 1588 vput(dvp); 1589 1590 CODADEBUG(CODA_SYMLINK, myprintf(("in symlink result %d\n",error)); ) 1591 return(error); 1592 } 1593 1594 /* 1595 * Read directory entries. 1596 */ 1597 int 1598 coda_readdir(void *v) 1599 { 1600 /* true args */ 1601 struct vop_readdir_args *ap = v; 1602 vnode_t *vp = ap->a_vp; 1603 struct cnode *cp = VTOC(vp); 1604 struct uio *uiop = ap->a_uio; 1605 kauth_cred_t cred = ap->a_cred; 1606 int *eofflag = ap->a_eofflag; 1607 off_t **cookies = ap->a_cookies; 1608 int *ncookies = ap->a_ncookies; 1609 /* upcall decl */ 1610 /* locals */ 1611 int error = 0; 1612 1613 MARK_ENTRY(CODA_READDIR_STATS); 1614 1615 CODADEBUG(CODA_READDIR, myprintf(("%s: (%p, %lu, %lld)\n", __func__, 1616 uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, 1617 (long long) uiop->uio_offset)); ) 1618 1619 /* Check for readdir of control object. */ 1620 if (IS_CTL_VP(vp)) { 1621 MARK_INT_FAIL(CODA_READDIR_STATS); 1622 return(ENOENT); 1623 } 1624 1625 { 1626 /* Redirect the request to UFS. */ 1627 1628 /* If directory is not already open do an "internal open" on it. */ 1629 int opened_internally = 0; 1630 if (cp->c_ovp == NULL) { 1631 opened_internally = 1; 1632 MARK_INT_GEN(CODA_OPEN_STATS); 1633 error = VOP_OPEN(vp, FREAD, cred); 1634 #ifdef CODA_VERBOSE 1635 printf("%s: Internally Opening %p\n", __func__, vp); 1636 #endif 1637 if (error) return(error); 1638 } else 1639 vp = cp->c_ovp; 1640 1641 /* Have UFS handle the call. */ 1642 CODADEBUG(CODA_READDIR, myprintf(("%s: fid = %s, refcnt = %d\n", 1643 __func__, coda_f2s(&cp->c_fid), vp->v_usecount)); ) 1644 error = VOP_READDIR(vp, uiop, cred, eofflag, cookies, ncookies); 1645 if (error) 1646 MARK_INT_FAIL(CODA_READDIR_STATS); 1647 else 1648 MARK_INT_SAT(CODA_READDIR_STATS); 1649 1650 /* Do an "internal close" if necessary. */ 1651 if (opened_internally) { 1652 MARK_INT_GEN(CODA_CLOSE_STATS); 1653 (void)VOP_CLOSE(vp, FREAD, cred); 1654 } 1655 } 1656 1657 return(error); 1658 } 1659 1660 /* 1661 * Convert from file system blocks to device blocks 1662 */ 1663 int 1664 coda_bmap(void *v) 1665 { 1666 /* XXX on the global proc */ 1667 /* true args */ 1668 struct vop_bmap_args *ap = v; 1669 vnode_t *vp __unused = ap->a_vp; /* file's vnode */ 1670 daddr_t bn __unused = ap->a_bn; /* fs block number */ 1671 vnode_t **vpp = ap->a_vpp; /* RETURN vp of device */ 1672 daddr_t *bnp __unused = ap->a_bnp; /* RETURN device block number */ 1673 struct lwp *l __unused = curlwp; 1674 /* upcall decl */ 1675 /* locals */ 1676 1677 *vpp = (vnode_t *)0; 1678 myprintf(("coda_bmap called!\n")); 1679 return(EINVAL); 1680 } 1681 1682 /* 1683 * I don't think the following two things are used anywhere, so I've 1684 * commented them out 1685 * 1686 * struct buf *async_bufhead; 1687 * int async_daemon_count; 1688 */ 1689 int 1690 coda_strategy(void *v) 1691 { 1692 /* true args */ 1693 struct vop_strategy_args *ap = v; 1694 struct buf *bp __unused = ap->a_bp; 1695 struct lwp *l __unused = curlwp; 1696 /* upcall decl */ 1697 /* locals */ 1698 1699 myprintf(("coda_strategy called! ")); 1700 return(EINVAL); 1701 } 1702 1703 int 1704 coda_reclaim(void *v) 1705 { 1706 /* true args */ 1707 struct vop_reclaim_args *ap = v; 1708 vnode_t *vp = ap->a_vp; 1709 struct cnode *cp = VTOC(vp); 1710 /* upcall decl */ 1711 /* locals */ 1712 1713 /* 1714 * Forced unmount/flush will let vnodes with non zero use be destroyed! 1715 */ 1716 ENTRY; 1717 1718 if (IS_UNMOUNTING(cp)) { 1719 #ifdef DEBUG 1720 if (VTOC(vp)->c_ovp) { 1721 if (IS_UNMOUNTING(cp)) 1722 printf("%s: c_ovp not void: vp %p, cp %p\n", __func__, vp, cp); 1723 } 1724 #endif 1725 } else { 1726 #ifdef OLD_DIAGNOSTIC 1727 if (vp->v_usecount != 0) 1728 print("%s: pushing active %p\n", __func__, vp); 1729 if (VTOC(vp)->c_ovp) { 1730 panic("%s: c_ovp not void", __func__); 1731 } 1732 #endif 1733 } 1734 coda_free(VTOC(vp)); 1735 SET_VTOC(vp) = NULL; 1736 return (0); 1737 } 1738 1739 int 1740 coda_lock(void *v) 1741 { 1742 /* true args */ 1743 struct vop_lock_args *ap = v; 1744 vnode_t *vp = ap->a_vp; 1745 struct cnode *cp = VTOC(vp); 1746 /* upcall decl */ 1747 /* locals */ 1748 1749 ENTRY; 1750 1751 if (coda_lockdebug) { 1752 myprintf(("Attempting lock on %s\n", 1753 coda_f2s(&cp->c_fid))); 1754 } 1755 1756 return genfs_lock(v); 1757 } 1758 1759 int 1760 coda_unlock(void *v) 1761 { 1762 /* true args */ 1763 struct vop_unlock_args *ap = v; 1764 vnode_t *vp = ap->a_vp; 1765 struct cnode *cp = VTOC(vp); 1766 /* upcall decl */ 1767 /* locals */ 1768 1769 ENTRY; 1770 if (coda_lockdebug) { 1771 myprintf(("Attempting unlock on %s\n", 1772 coda_f2s(&cp->c_fid))); 1773 } 1774 1775 return genfs_unlock(v); 1776 } 1777 1778 int 1779 coda_islocked(void *v) 1780 { 1781 /* true args */ 1782 ENTRY; 1783 1784 return genfs_islocked(v); 1785 } 1786 1787 /* 1788 * Given a device and inode, obtain a locked vnode. One reference is 1789 * obtained and passed back to the caller. 1790 */ 1791 int 1792 coda_grab_vnode(vnode_t *uvp, dev_t dev, ino_t ino, vnode_t **vpp) 1793 { 1794 int error; 1795 struct mount *mp; 1796 1797 /* Obtain mount point structure from device. */ 1798 if (!(mp = devtomp(dev))) { 1799 myprintf(("%s: devtomp(0x%llx) returns NULL\n", __func__, 1800 (unsigned long long)dev)); 1801 return(ENXIO); 1802 } 1803 1804 /* 1805 * Obtain vnode from mount point and inode. 1806 * XXX VFS_VGET does not clearly define locked/referenced state of 1807 * returned vnode. 1808 */ 1809 error = VFS_VGET(mp, ino, vpp); 1810 if (error) { 1811 myprintf(("%s: iget/vget(0x%llx, %llu) returns %p, err %d\n", __func__, 1812 (unsigned long long)dev, (unsigned long long)ino, *vpp, error)); 1813 return(ENOENT); 1814 } 1815 /* share the underlying vnode lock with the coda vnode */ 1816 mutex_obj_hold((*vpp)->v_interlock); 1817 uvm_obj_setlock(&uvp->v_uobj, (*vpp)->v_interlock); 1818 return(0); 1819 } 1820 1821 void 1822 print_vattr(struct vattr *attr) 1823 { 1824 const char *typestr; 1825 1826 switch (attr->va_type) { 1827 case VNON: 1828 typestr = "VNON"; 1829 break; 1830 case VREG: 1831 typestr = "VREG"; 1832 break; 1833 case VDIR: 1834 typestr = "VDIR"; 1835 break; 1836 case VBLK: 1837 typestr = "VBLK"; 1838 break; 1839 case VCHR: 1840 typestr = "VCHR"; 1841 break; 1842 case VLNK: 1843 typestr = "VLNK"; 1844 break; 1845 case VSOCK: 1846 typestr = "VSCK"; 1847 break; 1848 case VFIFO: 1849 typestr = "VFFO"; 1850 break; 1851 case VBAD: 1852 typestr = "VBAD"; 1853 break; 1854 default: 1855 typestr = "????"; 1856 break; 1857 } 1858 1859 1860 myprintf(("attr: type %s mode %d uid %d gid %d fsid %d rdev %d\n", 1861 typestr, (int)attr->va_mode, (int)attr->va_uid, 1862 (int)attr->va_gid, (int)attr->va_fsid, (int)attr->va_rdev)); 1863 1864 myprintf((" fileid %d nlink %d size %d blocksize %d bytes %d\n", 1865 (int)attr->va_fileid, (int)attr->va_nlink, 1866 (int)attr->va_size, 1867 (int)attr->va_blocksize,(int)attr->va_bytes)); 1868 myprintf((" gen %ld flags %ld vaflags %d\n", 1869 attr->va_gen, attr->va_flags, attr->va_vaflags)); 1870 myprintf((" atime sec %d nsec %d\n", 1871 (int)attr->va_atime.tv_sec, (int)attr->va_atime.tv_nsec)); 1872 myprintf((" mtime sec %d nsec %d\n", 1873 (int)attr->va_mtime.tv_sec, (int)attr->va_mtime.tv_nsec)); 1874 myprintf((" ctime sec %d nsec %d\n", 1875 (int)attr->va_ctime.tv_sec, (int)attr->va_ctime.tv_nsec)); 1876 } 1877 1878 /* How to print a ucred */ 1879 void 1880 print_cred(kauth_cred_t cred) 1881 { 1882 1883 uint16_t ngroups; 1884 int i; 1885 1886 myprintf(("ref %d\tuid %d\n", kauth_cred_getrefcnt(cred), 1887 kauth_cred_geteuid(cred))); 1888 1889 ngroups = kauth_cred_ngroups(cred); 1890 for (i=0; i < ngroups; i++) 1891 myprintf(("\tgroup %d: (%d)\n", i, kauth_cred_group(cred, i))); 1892 myprintf(("\n")); 1893 1894 } 1895 1896 /* 1897 * Return a vnode for the given fid. 1898 * If no cnode exists for this fid create one and put it 1899 * in a table hashed by coda_f2i(). If the cnode for 1900 * this fid is already in the table return it (ref count is 1901 * incremented by coda_find. The cnode will be flushed from the 1902 * table when coda_inactive calls coda_unsave. 1903 */ 1904 struct cnode * 1905 make_coda_node(CodaFid *fid, struct mount *fvsp, short type) 1906 { 1907 struct cnode *cp; 1908 int error; 1909 1910 if ((cp = coda_find(fid)) == NULL) { 1911 vnode_t *vp; 1912 1913 cp = coda_alloc(); 1914 cp->c_fid = *fid; 1915 1916 error = getnewvnode(VT_CODA, fvsp, coda_vnodeop_p, NULL, &vp); 1917 if (error) { 1918 panic("%s: getnewvnode returned error %d", __func__, error); 1919 } 1920 vp->v_data = cp; 1921 vp->v_type = type; 1922 cp->c_vnode = vp; 1923 uvm_vnp_setsize(vp, 0); 1924 coda_save(cp); 1925 1926 } else { 1927 vref(CTOV(cp)); 1928 } 1929 1930 return cp; 1931 } 1932 1933 /* 1934 * coda_getpages may be called on a vnode which has not been opened, 1935 * e.g. to fault in pages to execute a program. In that case, we must 1936 * open the file to get the container. The vnode may or may not be 1937 * locked, and we must leave it in the same state. 1938 */ 1939 int 1940 coda_getpages(void *v) 1941 { 1942 struct vop_getpages_args /* { 1943 vnode_t *a_vp; 1944 voff_t a_offset; 1945 struct vm_page **a_m; 1946 int *a_count; 1947 int a_centeridx; 1948 vm_prot_t a_access_type; 1949 int a_advice; 1950 int a_flags; 1951 } */ *ap = v; 1952 vnode_t *vp = ap->a_vp, *cvp; 1953 struct cnode *cp = VTOC(vp); 1954 struct lwp *l = curlwp; 1955 kauth_cred_t cred = l->l_cred; 1956 int error, cerror; 1957 int waslocked; /* 1 if vnode lock was held on entry */ 1958 int didopen = 0; /* 1 if we opened container file */ 1959 1960 /* 1961 * Handle a case that uvm_fault doesn't quite use yet. 1962 * See layer_vnops.c. for inspiration. 1963 */ 1964 if (ap->a_flags & PGO_LOCKED) { 1965 return EBUSY; 1966 } 1967 1968 KASSERT(mutex_owned(vp->v_interlock)); 1969 1970 /* Check for control object. */ 1971 if (IS_CTL_VP(vp)) { 1972 #ifdef CODA_VERBOSE 1973 printf("%s: control object %p\n", __func__, vp); 1974 #endif 1975 return(EINVAL); 1976 } 1977 1978 /* 1979 * XXX It's really not ok to be releasing the lock we get, 1980 * because we could be overlapping with another call to 1981 * getpages and drop a lock they are relying on. We need to 1982 * figure out whether getpages ever is called holding the 1983 * lock, and if we should serialize getpages calls by some 1984 * mechanism. 1985 */ 1986 /* XXX VOP_ISLOCKED() may not be used for lock decisions. */ 1987 waslocked = VOP_ISLOCKED(vp); 1988 1989 /* Get container file if not already present. */ 1990 cvp = cp->c_ovp; 1991 if (cvp == NULL) { 1992 /* 1993 * VOP_OPEN requires a locked vnode. We must avoid 1994 * locking the vnode if it is already locked, and 1995 * leave it in the same state on exit. 1996 */ 1997 if (waslocked == 0) { 1998 mutex_exit(vp->v_interlock); 1999 cerror = vn_lock(vp, LK_EXCLUSIVE); 2000 if (cerror) { 2001 #ifdef CODA_VERBOSE 2002 printf("%s: can't lock vnode %p\n", 2003 __func__, vp); 2004 #endif 2005 return cerror; 2006 } 2007 #ifdef CODA_VERBOSE 2008 printf("%s: locked vnode %p\n", __func__, vp); 2009 #endif 2010 } 2011 2012 /* 2013 * Open file (causes upcall to venus). 2014 * XXX Perhaps we should not fully open the file, but 2015 * simply obtain a container file. 2016 */ 2017 /* XXX Is it ok to do this while holding the simplelock? */ 2018 cerror = VOP_OPEN(vp, FREAD, cred); 2019 2020 if (cerror) { 2021 #ifdef CODA_VERBOSE 2022 printf("%s: cannot open vnode %p => %d\n", __func__, 2023 vp, cerror); 2024 #endif 2025 if (waslocked == 0) 2026 VOP_UNLOCK(vp); 2027 return cerror; 2028 } 2029 2030 #ifdef CODA_VERBOSE 2031 printf("%s: opened vnode %p\n", __func__, vp); 2032 #endif 2033 cvp = cp->c_ovp; 2034 didopen = 1; 2035 if (waslocked == 0) 2036 mutex_enter(vp->v_interlock); 2037 } 2038 KASSERT(cvp != NULL); 2039 2040 /* Munge the arg structure to refer to the container vnode. */ 2041 KASSERT(cvp->v_interlock == vp->v_interlock); 2042 ap->a_vp = cp->c_ovp; 2043 2044 /* Finally, call getpages on it. */ 2045 error = VCALL(ap->a_vp, VOFFSET(vop_getpages), ap); 2046 2047 /* If we opened the vnode, we must close it. */ 2048 if (didopen) { 2049 /* 2050 * VOP_CLOSE requires a locked vnode, but we are still 2051 * holding the lock (or riding a caller's lock). 2052 */ 2053 cerror = VOP_CLOSE(vp, FREAD, cred); 2054 #ifdef CODA_VERBOSE 2055 if (cerror != 0) 2056 /* XXX How should we handle this? */ 2057 printf("%s: closed vnode %p -> %d\n", __func__, 2058 vp, cerror); 2059 #endif 2060 2061 /* If we obtained a lock, drop it. */ 2062 if (waslocked == 0) 2063 VOP_UNLOCK(vp); 2064 } 2065 2066 return error; 2067 } 2068 2069 /* 2070 * The protocol requires v_interlock to be held by the caller. 2071 */ 2072 int 2073 coda_putpages(void *v) 2074 { 2075 struct vop_putpages_args /* { 2076 vnode_t *a_vp; 2077 voff_t a_offlo; 2078 voff_t a_offhi; 2079 int a_flags; 2080 } */ *ap = v; 2081 vnode_t *vp = ap->a_vp, *cvp; 2082 struct cnode *cp = VTOC(vp); 2083 int error; 2084 2085 KASSERT(mutex_owned(vp->v_interlock)); 2086 2087 /* Check for control object. */ 2088 if (IS_CTL_VP(vp)) { 2089 mutex_exit(vp->v_interlock); 2090 #ifdef CODA_VERBOSE 2091 printf("%s: control object %p\n", __func__, vp); 2092 #endif 2093 return(EINVAL); 2094 } 2095 2096 /* 2097 * If container object is not present, then there are no pages 2098 * to put; just return without error. This happens all the 2099 * time, apparently during discard of a closed vnode (which 2100 * trivially can't have dirty pages). 2101 */ 2102 cvp = cp->c_ovp; 2103 if (cvp == NULL) { 2104 mutex_exit(vp->v_interlock); 2105 return 0; 2106 } 2107 2108 /* Munge the arg structure to refer to the container vnode. */ 2109 KASSERT(cvp->v_interlock == vp->v_interlock); 2110 ap->a_vp = cvp; 2111 2112 /* Finally, call putpages on it. */ 2113 error = VCALL(ap->a_vp, VOFFSET(vop_putpages), ap); 2114 2115 return error; 2116 } 2117
Indexes created Mon Oct 20 16:09:52 GMT 2025