coda_vnops.c revision 1.68.12.2
1 /* $NetBSD: coda_vnops.c,v 1.68.12.2 2009/07/18 14:52:57 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 1.68.12.2 2009/07/18 14:52:57 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/user.h> 64 #include <sys/vnode.h> 65 #include <sys/kauth.h> 66 67 #include <miscfs/genfs/genfs.h> 68 69 #include <coda/coda.h> 70 #include <coda/cnode.h> 71 #include <coda/coda_vnops.h> 72 #include <coda/coda_venus.h> 73 #include <coda/coda_opstats.h> 74 #include <coda/coda_subr.h> 75 #include <coda/coda_namecache.h> 76 #include <coda/coda_pioctl.h> 77 78 /* 79 * These flags select various performance enhancements. 80 */ 81 int coda_attr_cache = 1; /* Set to cache attributes in the kernel */ 82 int coda_symlink_cache = 1; /* Set to cache symbolic link information */ 83 int coda_access_cache = 1; /* Set to handle some access checks directly */ 84 85 /* structure to keep track of vfs calls */ 86 87 struct coda_op_stats coda_vnodeopstats[CODA_VNODEOPS_SIZE]; 88 89 #define MARK_ENTRY(op) (coda_vnodeopstats[op].entries++) 90 #define MARK_INT_SAT(op) (coda_vnodeopstats[op].sat_intrn++) 91 #define MARK_INT_FAIL(op) (coda_vnodeopstats[op].unsat_intrn++) 92 #define MARK_INT_GEN(op) (coda_vnodeopstats[op].gen_intrn++) 93 94 /* What we are delaying for in printf */ 95 int coda_printf_delay = 0; /* in microseconds */ 96 int coda_vnop_print_entry = 0; 97 static int coda_lockdebug = 0; 98 99 #define ENTRY if(coda_vnop_print_entry) myprintf(("Entered %s\n",__func__)) 100 101 /* Definition of the vnode operation vector */ 102 103 const struct vnodeopv_entry_desc coda_vnodeop_entries[] = { 104 { &vop_default_desc, coda_vop_error }, 105 { &vop_lookup_desc, coda_lookup }, /* lookup */ 106 { &vop_create_desc, coda_create }, /* create */ 107 { &vop_mknod_desc, coda_vop_error }, /* mknod */ 108 { &vop_open_desc, coda_open }, /* open */ 109 { &vop_close_desc, coda_close }, /* close */ 110 { &vop_access_desc, coda_access }, /* access */ 111 { &vop_getattr_desc, coda_getattr }, /* getattr */ 112 { &vop_setattr_desc, coda_setattr }, /* setattr */ 113 { &vop_read_desc, coda_read }, /* read */ 114 { &vop_write_desc, coda_write }, /* write */ 115 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 116 { &vop_ioctl_desc, coda_ioctl }, /* ioctl */ 117 { &vop_mmap_desc, genfs_mmap }, /* mmap */ 118 { &vop_fsync_desc, coda_fsync }, /* fsync */ 119 { &vop_remove_desc, coda_remove }, /* remove */ 120 { &vop_link_desc, coda_link }, /* link */ 121 { &vop_rename_desc, coda_rename }, /* rename */ 122 { &vop_mkdir_desc, coda_mkdir }, /* mkdir */ 123 { &vop_rmdir_desc, coda_rmdir }, /* rmdir */ 124 { &vop_symlink_desc, coda_symlink }, /* symlink */ 125 { &vop_readdir_desc, coda_readdir }, /* readdir */ 126 { &vop_readlink_desc, coda_readlink }, /* readlink */ 127 { &vop_abortop_desc, coda_abortop }, /* abortop */ 128 { &vop_inactive_desc, coda_inactive }, /* inactive */ 129 { &vop_reclaim_desc, coda_reclaim }, /* reclaim */ 130 { &vop_lock_desc, coda_lock }, /* lock */ 131 { &vop_unlock_desc, coda_unlock }, /* unlock */ 132 { &vop_bmap_desc, coda_bmap }, /* bmap */ 133 { &vop_strategy_desc, coda_strategy }, /* strategy */ 134 { &vop_print_desc, coda_vop_error }, /* print */ 135 { &vop_islocked_desc, coda_islocked }, /* islocked */ 136 { &vop_pathconf_desc, coda_vop_error }, /* pathconf */ 137 { &vop_advlock_desc, coda_vop_nop }, /* advlock */ 138 { &vop_bwrite_desc, coda_vop_error }, /* bwrite */ 139 { &vop_seek_desc, genfs_seek }, /* seek */ 140 { &vop_poll_desc, genfs_poll }, /* poll */ 141 { &vop_getpages_desc, coda_getpages }, /* getpages */ 142 { &vop_putpages_desc, coda_putpages }, /* putpages */ 143 { NULL, NULL } 144 }; 145 146 const struct vnodeopv_desc coda_vnodeop_opv_desc = 147 { &coda_vnodeop_p, coda_vnodeop_entries }; 148 149 /* Definitions of NetBSD vnodeop interfaces */ 150 151 /* 152 * A generic error routine. Return EIO without looking at arguments. 153 */ 154 int 155 coda_vop_error(void *anon) { 156 struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; 157 158 if (codadebug) { 159 myprintf(("coda_vop_error: Vnode operation %s called (error).\n", 160 (*desc)->vdesc_name)); 161 } 162 163 return EIO; 164 } 165 166 /* A generic do-nothing. */ 167 int 168 coda_vop_nop(void *anon) { 169 struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; 170 171 if (codadebug) { 172 myprintf(("Vnode operation %s called, but unsupported\n", 173 (*desc)->vdesc_name)); 174 } 175 return (0); 176 } 177 178 int 179 coda_vnodeopstats_init(void) 180 { 181 int i; 182 183 for(i=0;i<CODA_VNODEOPS_SIZE;i++) { 184 coda_vnodeopstats[i].opcode = i; 185 coda_vnodeopstats[i].entries = 0; 186 coda_vnodeopstats[i].sat_intrn = 0; 187 coda_vnodeopstats[i].unsat_intrn = 0; 188 coda_vnodeopstats[i].gen_intrn = 0; 189 } 190 191 return 0; 192 } 193 194 /* 195 * XXX The entire relationship between VOP_OPEN and having a container 196 * file (via venus_open) needs to be reexamined. In particular, it's 197 * valid to open/mmap/close and then reference. Instead of doing 198 * VOP_OPEN when getpages needs a container, we should do the 199 * venus_open part, and record that the vnode has opened the container 200 * for getpages, and do the matching logical close on coda_inactive. 201 * Further, coda_rdwr needs a container file, and sometimes needs to 202 * do the equivalent of open (core dumps). 203 */ 204 /* 205 * coda_open calls Venus to return the device and inode of the 206 * container file, and then obtains a vnode for that file. The 207 * container vnode is stored in the coda vnode, and a reference is 208 * added for each open file. 209 */ 210 int 211 coda_open(void *v) 212 { 213 /* 214 * NetBSD can pass the O_EXCL flag in mode, even though the check 215 * has already happened. Venus defensively assumes that if open 216 * is passed the EXCL, it must be a bug. We strip the flag here. 217 */ 218 /* true args */ 219 struct vop_open_args *ap = v; 220 struct vnode *vp = ap->a_vp; 221 struct cnode *cp = VTOC(vp); 222 int flag = ap->a_mode & (~O_EXCL); 223 kauth_cred_t cred = ap->a_cred; 224 /* locals */ 225 int error; 226 dev_t dev; /* container file device, inode, vnode */ 227 ino_t inode; 228 struct vnode *container_vp; 229 230 MARK_ENTRY(CODA_OPEN_STATS); 231 232 /* Check for open of control file. */ 233 if (IS_CTL_VP(vp)) { 234 /* if (WRITABLE(flag)) */ 235 if (flag & (FWRITE | O_TRUNC | O_CREAT | O_EXCL)) { 236 MARK_INT_FAIL(CODA_OPEN_STATS); 237 return(EACCES); 238 } 239 MARK_INT_SAT(CODA_OPEN_STATS); 240 return(0); 241 } 242 243 error = venus_open(vtomi(vp), &cp->c_fid, flag, cred, curlwp, &dev, &inode); 244 if (error) 245 return (error); 246 if (!error) { 247 CODADEBUG(CODA_OPEN, 248 myprintf(("open: dev 0x%llx inode %llu result %d\n", 249 (unsigned long long)dev, (unsigned long long)inode, error));) 250 } 251 252 /* 253 * Obtain locked and referenced container vnode from container 254 * device/inode. 255 */ 256 error = coda_grab_vnode(dev, inode, &container_vp); 257 if (error) 258 return (error); 259 260 /* Save the vnode pointer for the container file. */ 261 if (cp->c_ovp == NULL) { 262 cp->c_ovp = container_vp; 263 } else { 264 if (cp->c_ovp != container_vp) 265 /* 266 * Perhaps venus returned a different container, or 267 * something else went wrong. 268 */ 269 panic("coda_open: cp->c_ovp != container_vp"); 270 } 271 cp->c_ocount++; 272 273 /* Flush the attribute cache if writing the file. */ 274 if (flag & FWRITE) { 275 cp->c_owrite++; 276 cp->c_flags &= ~C_VATTR; 277 } 278 279 /* 280 * Save the <device, inode> pair for the container file to speed 281 * up subsequent reads while closed (mmap, program execution). 282 * This is perhaps safe because venus will invalidate the node 283 * before changing the container file mapping. 284 */ 285 cp->c_device = dev; 286 cp->c_inode = inode; 287 288 /* Open the container file. */ 289 error = VOP_OPEN(container_vp, flag, cred); 290 /* 291 * Drop the lock on the container, after we have done VOP_OPEN 292 * (which requires a locked vnode). 293 */ 294 VOP_UNLOCK(container_vp, 0); 295 return(error); 296 } 297 298 /* 299 * Close the cache file used for I/O and notify Venus. 300 */ 301 int 302 coda_close(void *v) 303 { 304 /* true args */ 305 struct vop_close_args *ap = v; 306 struct vnode *vp = ap->a_vp; 307 struct cnode *cp = VTOC(vp); 308 int flag = ap->a_fflag; 309 kauth_cred_t cred = ap->a_cred; 310 /* locals */ 311 int error; 312 313 MARK_ENTRY(CODA_CLOSE_STATS); 314 315 /* Check for close of control file. */ 316 if (IS_CTL_VP(vp)) { 317 MARK_INT_SAT(CODA_CLOSE_STATS); 318 return(0); 319 } 320 321 /* 322 * XXX The IS_UNMOUNTING part of this is very suspect. 323 */ 324 if (IS_UNMOUNTING(cp)) { 325 if (cp->c_ovp) { 326 #ifdef CODA_VERBOSE 327 printf("coda_close: destroying container ref %d, ufs vp %p of vp %p/cp %p\n", 328 vp->v_usecount, cp->c_ovp, vp, cp); 329 #endif 330 #ifdef hmm 331 vgone(cp->c_ovp); 332 #else 333 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 334 VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ 335 vput(cp->c_ovp); 336 #endif 337 } else { 338 #ifdef CODA_VERBOSE 339 printf("coda_close: NO container vp %p/cp %p\n", vp, cp); 340 #endif 341 } 342 return ENODEV; 343 } 344 345 /* Lock the container node, and VOP_CLOSE it. */ 346 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 347 VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ 348 /* 349 * Drop the lock we just obtained, and vrele the container vnode. 350 * Decrement reference counts, and clear container vnode pointer on 351 * last close. 352 */ 353 vput(cp->c_ovp); 354 if (flag & FWRITE) 355 --cp->c_owrite; 356 if (--cp->c_ocount == 0) 357 cp->c_ovp = NULL; 358 359 error = venus_close(vtomi(vp), &cp->c_fid, flag, cred, curlwp); 360 361 CODADEBUG(CODA_CLOSE, myprintf(("close: result %d\n",error)); ) 362 return(error); 363 } 364 365 int 366 coda_read(void *v) 367 { 368 struct vop_read_args *ap = v; 369 370 ENTRY; 371 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_READ, 372 ap->a_ioflag, ap->a_cred, curlwp)); 373 } 374 375 int 376 coda_write(void *v) 377 { 378 struct vop_write_args *ap = v; 379 380 ENTRY; 381 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_WRITE, 382 ap->a_ioflag, ap->a_cred, curlwp)); 383 } 384 385 int 386 coda_rdwr(struct vnode *vp, struct uio *uiop, enum uio_rw rw, int ioflag, 387 kauth_cred_t cred, struct lwp *l) 388 { 389 /* upcall decl */ 390 /* NOTE: container file operation!!! */ 391 /* locals */ 392 struct cnode *cp = VTOC(vp); 393 struct vnode *cfvp = cp->c_ovp; 394 struct proc *p = l->l_proc; 395 int opened_internally = 0; 396 int error = 0; 397 398 MARK_ENTRY(CODA_RDWR_STATS); 399 400 CODADEBUG(CODA_RDWR, myprintf(("coda_rdwr(%d, %p, %lu, %lld)\n", rw, 401 uiop->uio_iov->iov_base, 402 (unsigned long) uiop->uio_resid, 403 (long long) uiop->uio_offset)); ) 404 405 /* Check for rdwr of control object. */ 406 if (IS_CTL_VP(vp)) { 407 MARK_INT_FAIL(CODA_RDWR_STATS); 408 return(EINVAL); 409 } 410 411 /* Redirect the request to UFS. */ 412 413 /* 414 * If file is not already open this must be a page 415 * {read,write} request. Iget the cache file's inode 416 * pointer if we still have its <device, inode> pair. 417 * Otherwise, we must do an internal open to derive the 418 * pair. 419 * XXX Integrate this into a coherent strategy for container 420 * file acquisition. 421 */ 422 if (cfvp == NULL) { 423 /* 424 * If we're dumping core, do the internal open. Otherwise 425 * venus won't have the correct size of the core when 426 * it's completely written. 427 */ 428 if (cp->c_inode != 0 && !(p && (p->p_acflag & ACORE))) { 429 printf("coda_rdwr: grabbing container vnode, losing reference\n"); 430 /* Get locked and refed vnode. */ 431 error = coda_grab_vnode(cp->c_device, cp->c_inode, &cfvp); 432 if (error) { 433 MARK_INT_FAIL(CODA_RDWR_STATS); 434 return(error); 435 } 436 /* 437 * Drop lock. 438 * XXX Where is reference released. 439 */ 440 VOP_UNLOCK(cfvp, 0); 441 } 442 else { 443 printf("coda_rdwr: internal VOP_OPEN\n"); 444 opened_internally = 1; 445 MARK_INT_GEN(CODA_OPEN_STATS); 446 error = VOP_OPEN(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); 447 #ifdef CODA_VERBOSE 448 printf("coda_rdwr: Internally Opening %p\n", vp); 449 #endif 450 if (error) { 451 MARK_INT_FAIL(CODA_RDWR_STATS); 452 return(error); 453 } 454 cfvp = cp->c_ovp; 455 } 456 } 457 458 /* Have UFS handle the call. */ 459 CODADEBUG(CODA_RDWR, myprintf(("indirect rdwr: fid = %s, refcnt = %d\n", 460 coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount)); ) 461 462 if (rw == UIO_READ) { 463 error = VOP_READ(cfvp, uiop, ioflag, cred); 464 } else { 465 error = VOP_WRITE(cfvp, uiop, ioflag, cred); 466 } 467 468 if (error) 469 MARK_INT_FAIL(CODA_RDWR_STATS); 470 else 471 MARK_INT_SAT(CODA_RDWR_STATS); 472 473 /* Do an internal close if necessary. */ 474 if (opened_internally) { 475 MARK_INT_GEN(CODA_CLOSE_STATS); 476 (void)VOP_CLOSE(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); 477 } 478 479 /* Invalidate cached attributes if writing. */ 480 if (rw == UIO_WRITE) 481 cp->c_flags &= ~C_VATTR; 482 return(error); 483 } 484 485 int 486 coda_ioctl(void *v) 487 { 488 /* true args */ 489 struct vop_ioctl_args *ap = v; 490 struct vnode *vp = ap->a_vp; 491 int com = ap->a_command; 492 void *data = ap->a_data; 493 int flag = ap->a_fflag; 494 kauth_cred_t cred = ap->a_cred; 495 /* locals */ 496 int error; 497 struct vnode *tvp; 498 struct PioctlData *iap = (struct PioctlData *)data; 499 namei_simple_flags_t sflags; 500 501 MARK_ENTRY(CODA_IOCTL_STATS); 502 503 CODADEBUG(CODA_IOCTL, myprintf(("in coda_ioctl on %s\n", iap->path));) 504 505 /* Don't check for operation on a dying object, for ctlvp it 506 shouldn't matter */ 507 508 /* Must be control object to succeed. */ 509 if (!IS_CTL_VP(vp)) { 510 MARK_INT_FAIL(CODA_IOCTL_STATS); 511 CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: vp != ctlvp"));) 512 return (EOPNOTSUPP); 513 } 514 /* Look up the pathname. */ 515 516 /* Should we use the name cache here? It would get it from 517 lookupname sooner or later anyway, right? */ 518 519 sflags = iap->follow ? NSM_FOLLOW_NOEMULROOT : NSM_NOFOLLOW_NOEMULROOT; 520 error = namei_simple_user(iap->path, sflags, &tvp); 521 522 if (error) { 523 MARK_INT_FAIL(CODA_IOCTL_STATS); 524 CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: lookup returns %d\n", 525 error));) 526 return(error); 527 } 528 529 /* 530 * Make sure this is a coda style cnode, but it may be a 531 * different vfsp 532 */ 533 /* XXX: this totally violates the comment about vtagtype in vnode.h */ 534 if (tvp->v_tag != VT_CODA) { 535 vrele(tvp); 536 MARK_INT_FAIL(CODA_IOCTL_STATS); 537 CODADEBUG(CODA_IOCTL, 538 myprintf(("coda_ioctl error: %s not a coda object\n", 539 iap->path));) 540 return(EINVAL); 541 } 542 543 if (iap->vi.in_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 struct vnode *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(("attr cache hit: %s\n", 591 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(("getattr miss %s: result %d\n", 604 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 struct vnode *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 struct vnode *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 struct vnode *a_dvp; 705 struct componentname *a_cnp; 706 } */ *ap = v; 707 /* upcall decl */ 708 /* locals */ 709 710 if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF) 711 PNBUF_PUT(ap->a_cnp->cn_pnbuf); 712 return (0); 713 } 714 715 int 716 coda_readlink(void *v) 717 { 718 /* true args */ 719 struct vop_readlink_args *ap = v; 720 struct vnode *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 struct vnode *vp = ap->a_vp; 772 struct cnode *cp = VTOC(vp); 773 kauth_cred_t cred = ap->a_cred; 774 /* locals */ 775 struct vnode *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 struct vnode *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("coda_inactive: null symlink pointer in cnode"); 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 if (IS_UNMOUNTING(cp)) { 857 /* XXX Do we need to VOP_CLOSE container vnodes? */ 858 if (vp->v_usecount > 0) 859 printf("coda_inactive: IS_UNMOUNTING %p usecount %d\n", 860 vp, vp->v_usecount); 861 if (cp->c_ovp != NULL) 862 printf("coda_inactive: %p ovp != NULL\n", vp); 863 VOP_UNLOCK(vp, 0); 864 } else { 865 /* Sanity checks that perhaps should be panic. */ 866 if (vp->v_usecount) { 867 printf("coda_inactive: %p usecount %d\n", vp, vp->v_usecount); 868 } 869 if (cp->c_ovp != NULL) { 870 printf("coda_inactive: %p ovp != NULL\n", vp); 871 } 872 VOP_UNLOCK(vp, 0); 873 *ap->a_recycle = true; 874 } 875 876 MARK_INT_SAT(CODA_INACTIVE_STATS); 877 return(0); 878 } 879 880 /* 881 * Coda does not use the normal namecache, but a private version. 882 * Consider how to use the standard facility instead. 883 */ 884 int 885 coda_lookup(void *v) 886 { 887 /* true args */ 888 struct vop_lookup_args *ap = v; 889 /* (locked) vnode of dir in which to do lookup */ 890 struct vnode *dvp = ap->a_dvp; 891 struct cnode *dcp = VTOC(dvp); 892 /* output variable for result */ 893 struct vnode **vpp = ap->a_vpp; 894 /* name to lookup */ 895 struct componentname *cnp = ap->a_cnp; 896 kauth_cred_t cred = cnp->cn_cred; 897 struct lwp *l = curlwp; 898 /* locals */ 899 struct cnode *cp; 900 const char *nm = cnp->cn_nameptr; 901 int len = cnp->cn_namelen; 902 int flags = cnp->cn_flags; 903 int isdot; 904 CodaFid VFid; 905 int vtype; 906 int error = 0; 907 908 MARK_ENTRY(CODA_LOOKUP_STATS); 909 910 CODADEBUG(CODA_LOOKUP, myprintf(("lookup: %s in %s\n", 911 nm, coda_f2s(&dcp->c_fid)));); 912 913 /* 914 * XXX componentname flags in MODMASK are not handled at all 915 */ 916 917 /* 918 * The overall strategy is to switch on the lookup type and get a 919 * result vnode that is vref'd but not locked. Then, the code at 920 * exit: switches on ., .., and regular lookups and does the right 921 * locking. 922 */ 923 924 /* Check for lookup of control object. */ 925 if (IS_CTL_NAME(dvp, nm, len)) { 926 *vpp = coda_ctlvp; 927 vref(*vpp); 928 MARK_INT_SAT(CODA_LOOKUP_STATS); 929 goto exit; 930 } 931 932 /* Avoid trying to hand venus an unreasonably long name. */ 933 if (len+1 > CODA_MAXNAMLEN) { 934 MARK_INT_FAIL(CODA_LOOKUP_STATS); 935 CODADEBUG(CODA_LOOKUP, myprintf(("name too long: lookup, %s (%s)\n", 936 coda_f2s(&dcp->c_fid), nm));); 937 *vpp = (struct vnode *)0; 938 error = EINVAL; 939 goto exit; 940 } 941 942 /* 943 * XXX Check for DOT lookups, and short circuit all the caches, 944 * just doing an extra vref. (venus guarantees that lookup of 945 * . returns self.) 946 */ 947 isdot = (len == 1 && nm[0] == '.'); 948 949 /* 950 * Try to resolve the lookup in the minicache. If that fails, ask 951 * venus to do the lookup. XXX The interaction between vnode 952 * locking and any locking that coda does is not clear. 953 */ 954 cp = coda_nc_lookup(dcp, nm, len, cred); 955 if (cp) { 956 *vpp = CTOV(cp); 957 vref(*vpp); 958 CODADEBUG(CODA_LOOKUP, 959 myprintf(("lookup result %d vpp %p\n",error,*vpp));) 960 } else { 961 /* The name wasn't cached, so ask Venus. */ 962 error = venus_lookup(vtomi(dvp), &dcp->c_fid, nm, len, cred, l, &VFid, &vtype); 963 964 if (error) { 965 MARK_INT_FAIL(CODA_LOOKUP_STATS); 966 CODADEBUG(CODA_LOOKUP, myprintf(("lookup error on %s (%s)%d\n", 967 coda_f2s(&dcp->c_fid), nm, error));) 968 *vpp = (struct vnode *)0; 969 } else { 970 MARK_INT_SAT(CODA_LOOKUP_STATS); 971 CODADEBUG(CODA_LOOKUP, 972 myprintf(("lookup: %s type %o result %d\n", 973 coda_f2s(&VFid), vtype, error)); ) 974 975 cp = make_coda_node(&VFid, dvp->v_mount, vtype); 976 *vpp = CTOV(cp); 977 /* vpp is now vrefed. */ 978 979 /* 980 * Unless this vnode is marked CODA_NOCACHE, enter it into 981 * the coda name cache to avoid a future venus round-trip. 982 * XXX Interaction with componentname NOCACHE is unclear. 983 */ 984 if (!(vtype & CODA_NOCACHE)) 985 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 986 } 987 } 988 989 exit: 990 /* 991 * If we are creating, and this was the last name to be looked up, 992 * and the error was ENOENT, then make the leaf NULL and return 993 * success. 994 * XXX Check against new lookup rules. 995 */ 996 if (((cnp->cn_nameiop == CREATE) || (cnp->cn_nameiop == RENAME)) 997 && (cnp->cn_flags & ISLASTCN) 998 && (error == ENOENT)) 999 { 1000 error = EJUSTRETURN; 1001 cnp->cn_flags |= SAVENAME; 1002 *ap->a_vpp = NULL; 1003 } 1004 1005 /* 1006 * If we are removing, and we are at the last element, and we 1007 * found it, then we need to keep the name around so that the 1008 * removal will go ahead as planned. 1009 * XXX Check against new lookup rules. 1010 */ 1011 if ((cnp->cn_nameiop == DELETE) 1012 && (cnp->cn_flags & ISLASTCN) 1013 && !error) 1014 { 1015 cnp->cn_flags |= SAVENAME; 1016 } 1017 1018 /* 1019 * If the lookup succeeded, we must generally lock the returned 1020 * vnode. This could be a ., .., or normal lookup. See 1021 * vnodeops(9) for the details. 1022 */ 1023 /* 1024 * XXX LK_RETRY is likely incorrect. Handle vn_lock failure 1025 * somehow, and remove LK_RETRY. 1026 */ 1027 if (!error || (error == EJUSTRETURN)) { 1028 /* Lookup has a value and it isn't "."? */ 1029 if (*ap->a_vpp && (*ap->a_vpp != dvp)) { 1030 if (flags & ISDOTDOT) 1031 /* ..: unlock parent */ 1032 VOP_UNLOCK(dvp, 0); 1033 /* all but .: lock child */ 1034 vn_lock(*ap->a_vpp, LK_EXCLUSIVE | LK_RETRY); 1035 if (flags & ISDOTDOT) 1036 /* ..: relock parent */ 1037 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1038 } 1039 /* else .: leave dvp locked */ 1040 } else { 1041 /* The lookup failed, so return NULL. Leave dvp locked. */ 1042 *ap->a_vpp = NULL; 1043 } 1044 return(error); 1045 } 1046 1047 /*ARGSUSED*/ 1048 int 1049 coda_create(void *v) 1050 { 1051 /* true args */ 1052 struct vop_create_args *ap = v; 1053 struct vnode *dvp = ap->a_dvp; 1054 struct cnode *dcp = VTOC(dvp); 1055 struct vattr *va = ap->a_vap; 1056 int exclusive = 1; 1057 int mode = ap->a_vap->va_mode; 1058 struct vnode **vpp = ap->a_vpp; 1059 struct componentname *cnp = ap->a_cnp; 1060 kauth_cred_t cred = cnp->cn_cred; 1061 struct lwp *l = curlwp; 1062 /* locals */ 1063 int error; 1064 struct cnode *cp; 1065 const char *nm = cnp->cn_nameptr; 1066 int len = cnp->cn_namelen; 1067 CodaFid VFid; 1068 struct vattr attr; 1069 1070 MARK_ENTRY(CODA_CREATE_STATS); 1071 1072 /* All creates are exclusive XXX */ 1073 /* I'm assuming the 'mode' argument is the file mode bits XXX */ 1074 1075 /* Check for create of control object. */ 1076 if (IS_CTL_NAME(dvp, nm, len)) { 1077 *vpp = (struct vnode *)0; 1078 MARK_INT_FAIL(CODA_CREATE_STATS); 1079 return(EACCES); 1080 } 1081 1082 error = venus_create(vtomi(dvp), &dcp->c_fid, nm, len, exclusive, mode, va, cred, l, &VFid, &attr); 1083 1084 if (!error) { 1085 1086 /* 1087 * XXX Violation of venus/kernel invariants is a difficult case, 1088 * but venus should not be able to cause a panic. 1089 */ 1090 /* If this is an exclusive create, panic if the file already exists. */ 1091 /* Venus should have detected the file and reported EEXIST. */ 1092 1093 if ((exclusive == 1) && 1094 (coda_find(&VFid) != NULL)) 1095 panic("cnode existed for newly created file!"); 1096 1097 cp = make_coda_node(&VFid, dvp->v_mount, attr.va_type); 1098 *vpp = CTOV(cp); 1099 1100 /* XXX vnodeops doesn't say this argument can be changed. */ 1101 /* Update va to reflect the new attributes. */ 1102 (*va) = attr; 1103 1104 /* Update the attribute cache and mark it as valid */ 1105 if (coda_attr_cache) { 1106 VTOC(*vpp)->c_vattr = attr; 1107 VTOC(*vpp)->c_flags |= C_VATTR; 1108 } 1109 1110 /* Invalidate parent's attr cache (modification time has changed). */ 1111 VTOC(dvp)->c_flags &= ~C_VATTR; 1112 1113 /* enter the new vnode in the Name Cache */ 1114 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1115 1116 CODADEBUG(CODA_CREATE, 1117 myprintf(("create: %s, result %d\n", 1118 coda_f2s(&VFid), error)); ) 1119 } else { 1120 *vpp = (struct vnode *)0; 1121 CODADEBUG(CODA_CREATE, myprintf(("create error %d\n", error));) 1122 } 1123 1124 /* 1125 * vnodeops(9) says that we must unlock the parent and lock the child. 1126 * XXX Should we lock the child first? 1127 */ 1128 vput(dvp); 1129 if (!error) { 1130 if ((cnp->cn_flags & LOCKLEAF) == 0) { 1131 /* This should not happen; flags are for lookup only. */ 1132 printf("coda_create: LOCKLEAF not set!\n"); 1133 } 1134 1135 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { 1136 /* XXX Perhaps avoid this panic. */ 1137 panic("coda_create: couldn't lock child"); 1138 } 1139 } 1140 1141 /* Per vnodeops(9), free name except on success and SAVESTART. */ 1142 if (error || (cnp->cn_flags & SAVESTART) == 0) { 1143 PNBUF_PUT(cnp->cn_pnbuf); 1144 } 1145 return(error); 1146 } 1147 1148 int 1149 coda_remove(void *v) 1150 { 1151 /* true args */ 1152 struct vop_remove_args *ap = v; 1153 struct vnode *dvp = ap->a_dvp; 1154 struct cnode *cp = VTOC(dvp); 1155 struct vnode *vp = ap->a_vp; 1156 struct componentname *cnp = ap->a_cnp; 1157 kauth_cred_t cred = cnp->cn_cred; 1158 struct lwp *l = curlwp; 1159 /* locals */ 1160 int error; 1161 const char *nm = cnp->cn_nameptr; 1162 int len = cnp->cn_namelen; 1163 struct cnode *tp; 1164 1165 MARK_ENTRY(CODA_REMOVE_STATS); 1166 1167 CODADEBUG(CODA_REMOVE, myprintf(("remove: %s in %s\n", 1168 nm, coda_f2s(&cp->c_fid)));); 1169 1170 /* Remove the file's entry from the CODA Name Cache */ 1171 /* We're being conservative here, it might be that this person 1172 * doesn't really have sufficient access to delete the file 1173 * but we feel zapping the entry won't really hurt anyone -- dcs 1174 */ 1175 /* I'm gonna go out on a limb here. If a file and a hardlink to it 1176 * exist, and one is removed, the link count on the other will be 1177 * off by 1. We could either invalidate the attrs if cached, or 1178 * fix them. I'll try to fix them. DCS 11/8/94 1179 */ 1180 tp = coda_nc_lookup(VTOC(dvp), nm, len, cred); 1181 if (tp) { 1182 if (VALID_VATTR(tp)) { /* If attrs are cached */ 1183 if (tp->c_vattr.va_nlink > 1) { /* If it's a hard link */ 1184 tp->c_vattr.va_nlink--; 1185 } 1186 } 1187 1188 coda_nc_zapfile(VTOC(dvp), nm, len); 1189 /* No need to flush it if it doesn't exist! */ 1190 } 1191 /* Invalidate the parent's attr cache, the modification time has changed */ 1192 VTOC(dvp)->c_flags &= ~C_VATTR; 1193 1194 /* Check for remove of control object. */ 1195 if (IS_CTL_NAME(dvp, nm, len)) { 1196 MARK_INT_FAIL(CODA_REMOVE_STATS); 1197 return(ENOENT); 1198 } 1199 1200 error = venus_remove(vtomi(dvp), &cp->c_fid, nm, len, cred, l); 1201 1202 CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n",error)); ) 1203 1204 /* 1205 * Unlock parent and child (avoiding double if "."). 1206 */ 1207 if (dvp == vp) { 1208 vrele(vp); 1209 } else { 1210 vput(vp); 1211 } 1212 vput(dvp); 1213 1214 return(error); 1215 } 1216 1217 /* 1218 * dvp is the directory where the link is to go, and is locked. 1219 * vp is the object to be linked to, and is unlocked. 1220 * At exit, we must unlock dvp, and vput dvp. 1221 */ 1222 int 1223 coda_link(void *v) 1224 { 1225 /* true args */ 1226 struct vop_link_args *ap = v; 1227 struct vnode *vp = ap->a_vp; 1228 struct cnode *cp = VTOC(vp); 1229 struct vnode *dvp = ap->a_dvp; 1230 struct cnode *dcp = VTOC(dvp); 1231 struct componentname *cnp = ap->a_cnp; 1232 kauth_cred_t cred = cnp->cn_cred; 1233 struct lwp *l = curlwp; 1234 /* locals */ 1235 int error; 1236 const char *nm = cnp->cn_nameptr; 1237 int len = cnp->cn_namelen; 1238 1239 MARK_ENTRY(CODA_LINK_STATS); 1240 1241 if (codadebug & CODADBGMSK(CODA_LINK)) { 1242 1243 myprintf(("nb_link: vp fid: %s\n", 1244 coda_f2s(&cp->c_fid))); 1245 myprintf(("nb_link: dvp fid: %s)\n", 1246 coda_f2s(&dcp->c_fid))); 1247 1248 } 1249 if (codadebug & CODADBGMSK(CODA_LINK)) { 1250 myprintf(("link: vp fid: %s\n", 1251 coda_f2s(&cp->c_fid))); 1252 myprintf(("link: dvp fid: %s\n", 1253 coda_f2s(&dcp->c_fid))); 1254 1255 } 1256 1257 /* Check for link to/from control object. */ 1258 if (IS_CTL_NAME(dvp, nm, len) || IS_CTL_VP(vp)) { 1259 MARK_INT_FAIL(CODA_LINK_STATS); 1260 return(EACCES); 1261 } 1262 1263 /* If linking . to a name, error out earlier. */ 1264 if (vp == dvp) { 1265 printf("coda_link vp==dvp\n"); 1266 error = EISDIR; 1267 goto exit; 1268 } 1269 1270 /* XXX Why does venus_link need the vnode to be locked?*/ 1271 if ((error = vn_lock(vp, LK_EXCLUSIVE)) != 0) { 1272 printf("coda_link: couldn't lock vnode %p\n", vp); 1273 error = EFAULT; /* XXX better value */ 1274 goto exit; 1275 } 1276 error = venus_link(vtomi(vp), &cp->c_fid, &dcp->c_fid, nm, len, cred, l); 1277 VOP_UNLOCK(vp, 0); 1278 1279 /* Invalidate parent's attr cache (the modification time has changed). */ 1280 VTOC(dvp)->c_flags &= ~C_VATTR; 1281 /* Invalidate child's attr cache (XXX why). */ 1282 VTOC(vp)->c_flags &= ~C_VATTR; 1283 1284 CODADEBUG(CODA_LINK, myprintf(("in link result %d\n",error)); ) 1285 1286 exit: 1287 vput(dvp); 1288 return(error); 1289 } 1290 1291 int 1292 coda_rename(void *v) 1293 { 1294 /* true args */ 1295 struct vop_rename_args *ap = v; 1296 struct vnode *odvp = ap->a_fdvp; 1297 struct cnode *odcp = VTOC(odvp); 1298 struct componentname *fcnp = ap->a_fcnp; 1299 struct vnode *ndvp = ap->a_tdvp; 1300 struct cnode *ndcp = VTOC(ndvp); 1301 struct componentname *tcnp = ap->a_tcnp; 1302 kauth_cred_t cred = fcnp->cn_cred; 1303 struct lwp *l = curlwp; 1304 /* true args */ 1305 int error; 1306 const char *fnm = fcnp->cn_nameptr; 1307 int flen = fcnp->cn_namelen; 1308 const char *tnm = tcnp->cn_nameptr; 1309 int tlen = tcnp->cn_namelen; 1310 1311 MARK_ENTRY(CODA_RENAME_STATS); 1312 1313 /* Hmmm. The vnodes are already looked up. Perhaps they are locked? 1314 This could be Bad. XXX */ 1315 #ifdef OLD_DIAGNOSTIC 1316 if ((fcnp->cn_cred != tcnp->cn_cred) 1317 || (fcnp->cn_lwp != tcnp->cn_lwp)) 1318 { 1319 panic("coda_rename: component names don't agree"); 1320 } 1321 #endif 1322 1323 /* Check for rename involving control object. */ 1324 if (IS_CTL_NAME(odvp, fnm, flen) || IS_CTL_NAME(ndvp, tnm, tlen)) { 1325 MARK_INT_FAIL(CODA_RENAME_STATS); 1326 return(EACCES); 1327 } 1328 1329 /* Problem with moving directories -- need to flush entry for .. */ 1330 if (odvp != ndvp) { 1331 struct cnode *ovcp = coda_nc_lookup(VTOC(odvp), fnm, flen, cred); 1332 if (ovcp) { 1333 struct vnode *ovp = CTOV(ovcp); 1334 if ((ovp) && 1335 (ovp->v_type == VDIR)) /* If it's a directory */ 1336 coda_nc_zapfile(VTOC(ovp),"..", 2); 1337 } 1338 } 1339 1340 /* Remove the entries for both source and target files */ 1341 coda_nc_zapfile(VTOC(odvp), fnm, flen); 1342 coda_nc_zapfile(VTOC(ndvp), tnm, tlen); 1343 1344 /* Invalidate the parent's attr cache, the modification time has changed */ 1345 VTOC(odvp)->c_flags &= ~C_VATTR; 1346 VTOC(ndvp)->c_flags &= ~C_VATTR; 1347 1348 if (flen+1 > CODA_MAXNAMLEN) { 1349 MARK_INT_FAIL(CODA_RENAME_STATS); 1350 error = EINVAL; 1351 goto exit; 1352 } 1353 1354 if (tlen+1 > CODA_MAXNAMLEN) { 1355 MARK_INT_FAIL(CODA_RENAME_STATS); 1356 error = EINVAL; 1357 goto exit; 1358 } 1359 1360 error = venus_rename(vtomi(odvp), &odcp->c_fid, &ndcp->c_fid, fnm, flen, tnm, tlen, cred, l); 1361 1362 exit: 1363 CODADEBUG(CODA_RENAME, myprintf(("in rename result %d\n",error));) 1364 /* XXX - do we need to call cache pureg on the moved vnode? */ 1365 cache_purge(ap->a_fvp); 1366 1367 /* It seems to be incumbent on us to drop locks on all four vnodes */ 1368 /* From-vnodes are not locked, only ref'd. To-vnodes are locked. */ 1369 1370 vrele(ap->a_fvp); 1371 vrele(odvp); 1372 1373 if (ap->a_tvp) { 1374 if (ap->a_tvp == ndvp) { 1375 vrele(ap->a_tvp); 1376 } else { 1377 vput(ap->a_tvp); 1378 } 1379 } 1380 1381 vput(ndvp); 1382 return(error); 1383 } 1384 1385 int 1386 coda_mkdir(void *v) 1387 { 1388 /* true args */ 1389 struct vop_mkdir_args *ap = v; 1390 struct vnode *dvp = ap->a_dvp; 1391 struct cnode *dcp = VTOC(dvp); 1392 struct componentname *cnp = ap->a_cnp; 1393 struct vattr *va = ap->a_vap; 1394 struct vnode **vpp = ap->a_vpp; 1395 kauth_cred_t cred = cnp->cn_cred; 1396 struct lwp *l = curlwp; 1397 /* locals */ 1398 int error; 1399 const char *nm = cnp->cn_nameptr; 1400 int len = cnp->cn_namelen; 1401 struct cnode *cp; 1402 CodaFid VFid; 1403 struct vattr ova; 1404 1405 MARK_ENTRY(CODA_MKDIR_STATS); 1406 1407 /* Check for mkdir of target object. */ 1408 if (IS_CTL_NAME(dvp, nm, len)) { 1409 *vpp = (struct vnode *)0; 1410 MARK_INT_FAIL(CODA_MKDIR_STATS); 1411 return(EACCES); 1412 } 1413 1414 if (len+1 > CODA_MAXNAMLEN) { 1415 *vpp = (struct vnode *)0; 1416 MARK_INT_FAIL(CODA_MKDIR_STATS); 1417 return(EACCES); 1418 } 1419 1420 error = venus_mkdir(vtomi(dvp), &dcp->c_fid, nm, len, va, cred, l, &VFid, &ova); 1421 1422 if (!error) { 1423 if (coda_find(&VFid) != NULL) 1424 panic("cnode existed for newly created directory!"); 1425 1426 1427 cp = make_coda_node(&VFid, dvp->v_mount, va->va_type); 1428 *vpp = CTOV(cp); 1429 1430 /* enter the new vnode in the Name Cache */ 1431 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1432 1433 /* as a side effect, enter "." and ".." for the directory */ 1434 coda_nc_enter(VTOC(*vpp), ".", 1, cred, VTOC(*vpp)); 1435 coda_nc_enter(VTOC(*vpp), "..", 2, cred, VTOC(dvp)); 1436 1437 if (coda_attr_cache) { 1438 VTOC(*vpp)->c_vattr = ova; /* update the attr cache */ 1439 VTOC(*vpp)->c_flags |= C_VATTR; /* Valid attributes in cnode */ 1440 } 1441 1442 /* Invalidate the parent's attr cache, the modification time has changed */ 1443 VTOC(dvp)->c_flags &= ~C_VATTR; 1444 1445 CODADEBUG( CODA_MKDIR, myprintf(("mkdir: %s result %d\n", 1446 coda_f2s(&VFid), error)); ) 1447 } else { 1448 *vpp = (struct vnode *)0; 1449 CODADEBUG(CODA_MKDIR, myprintf(("mkdir error %d\n",error));) 1450 } 1451 1452 /* 1453 * Currently, all mkdirs explicitly vput their dvp's. 1454 * It also appears that we *must* lock the vpp, since 1455 * lockleaf isn't set, but someone down the road is going 1456 * to try to unlock the new directory. 1457 */ 1458 vput(dvp); 1459 if (!error) { 1460 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { 1461 panic("coda_mkdir: couldn't lock child"); 1462 } 1463 } 1464 1465 /* Per vnodeops(9), free name except on success and SAVESTART. */ 1466 if (error || (cnp->cn_flags & SAVESTART) == 0) { 1467 PNBUF_PUT(cnp->cn_pnbuf); 1468 } 1469 return(error); 1470 } 1471 1472 int 1473 coda_rmdir(void *v) 1474 { 1475 /* true args */ 1476 struct vop_rmdir_args *ap = v; 1477 struct vnode *dvp = ap->a_dvp; 1478 struct cnode *dcp = VTOC(dvp); 1479 struct vnode *vp = ap->a_vp; 1480 struct componentname *cnp = ap->a_cnp; 1481 kauth_cred_t cred = cnp->cn_cred; 1482 struct lwp *l = curlwp; 1483 /* true args */ 1484 int error; 1485 const char *nm = cnp->cn_nameptr; 1486 int len = cnp->cn_namelen; 1487 struct cnode *cp; 1488 1489 MARK_ENTRY(CODA_RMDIR_STATS); 1490 1491 /* Check for rmdir of control object. */ 1492 if (IS_CTL_NAME(dvp, nm, len)) { 1493 MARK_INT_FAIL(CODA_RMDIR_STATS); 1494 return(ENOENT); 1495 } 1496 1497 /* Can't remove . in self. */ 1498 if (dvp == vp) { 1499 printf("coda_rmdir: dvp == vp\n"); 1500 error = EINVAL; 1501 goto exit; 1502 } 1503 1504 /* 1505 * The caller may not have adequate permissions, and the venus 1506 * operation may fail, but it doesn't hurt from a correctness 1507 * viewpoint to invalidate cache entries. 1508 * XXX Why isn't this done after the venus_rmdir call? 1509 */ 1510 /* Look up child in name cache (by name, from parent). */ 1511 cp = coda_nc_lookup(dcp, nm, len, cred); 1512 /* If found, remove all children of the child (., ..). */ 1513 if (cp) coda_nc_zapParentfid(&(cp->c_fid), NOT_DOWNCALL); 1514 1515 /* Remove child's own entry. */ 1516 coda_nc_zapfile(dcp, nm, len); 1517 1518 /* Invalidate parent's attr cache (the modification time has changed). */ 1519 dcp->c_flags &= ~C_VATTR; 1520 1521 error = venus_rmdir(vtomi(dvp), &dcp->c_fid, nm, len, cred, l); 1522 1523 CODADEBUG(CODA_RMDIR, myprintf(("in rmdir result %d\n", error)); ) 1524 1525 exit: 1526 /* vput both vnodes */ 1527 vput(dvp); 1528 if (dvp == vp) { 1529 vrele(vp); 1530 } else { 1531 vput(vp); 1532 } 1533 1534 return(error); 1535 } 1536 1537 int 1538 coda_symlink(void *v) 1539 { 1540 /* true args */ 1541 struct vop_symlink_args *ap = v; 1542 struct vnode *dvp = ap->a_dvp; 1543 struct cnode *dcp = VTOC(dvp); 1544 /* a_vpp is used in place below */ 1545 struct componentname *cnp = ap->a_cnp; 1546 struct vattr *tva = ap->a_vap; 1547 char *path = ap->a_target; 1548 kauth_cred_t cred = cnp->cn_cred; 1549 struct lwp *l = curlwp; 1550 /* locals */ 1551 int error; 1552 u_long saved_cn_flags; 1553 const char *nm = cnp->cn_nameptr; 1554 int len = cnp->cn_namelen; 1555 int plen = strlen(path); 1556 1557 /* 1558 * Here's the strategy for the moment: perform the symlink, then 1559 * do a lookup to grab the resulting vnode. I know this requires 1560 * two communications with Venus for a new sybolic link, but 1561 * that's the way the ball bounces. I don't yet want to change 1562 * the way the Mach symlink works. When Mach support is 1563 * deprecated, we should change symlink so that the common case 1564 * returns the resultant vnode in a vpp argument. 1565 */ 1566 1567 MARK_ENTRY(CODA_SYMLINK_STATS); 1568 1569 /* Check for symlink of control object. */ 1570 if (IS_CTL_NAME(dvp, nm, len)) { 1571 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1572 error = EACCES; 1573 goto exit; 1574 } 1575 1576 if (plen+1 > CODA_MAXPATHLEN) { 1577 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1578 error = EINVAL; 1579 goto exit; 1580 } 1581 1582 if (len+1 > CODA_MAXNAMLEN) { 1583 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1584 error = EINVAL; 1585 goto exit; 1586 } 1587 1588 error = venus_symlink(vtomi(dvp), &dcp->c_fid, path, plen, nm, len, tva, cred, l); 1589 1590 /* Invalidate the parent's attr cache (modification time has changed). */ 1591 dcp->c_flags &= ~C_VATTR; 1592 1593 if (!error) { 1594 /* 1595 * VOP_SYMLINK is not defined to pay attention to cnp->cn_flags; 1596 * these are defined only for VOP_LOOKUP. We desire to reuse 1597 * cnp for a VOP_LOOKUP operation, and must be sure to not pass 1598 * stray flags passed to us. Such stray flags can occur because 1599 * sys_symlink makes a namei call and then reuses the 1600 * componentname structure. 1601 */ 1602 /* 1603 * XXX Arguably we should create our own componentname structure 1604 * and not reuse the one that was passed in. 1605 */ 1606 saved_cn_flags = cnp->cn_flags; 1607 cnp->cn_flags &= ~(MODMASK | OPMASK); 1608 cnp->cn_flags |= LOOKUP; 1609 error = VOP_LOOKUP(dvp, ap->a_vpp, cnp); 1610 cnp->cn_flags = saved_cn_flags; 1611 /* Either an error occurs, or ap->a_vpp is locked. */ 1612 } 1613 1614 exit: 1615 /* unlock and deference parent */ 1616 vput(dvp); 1617 1618 /* Per vnodeops(9), free name except on success and SAVESTART. */ 1619 if (error || (cnp->cn_flags & SAVESTART) == 0) { 1620 PNBUF_PUT(cnp->cn_pnbuf); 1621 } 1622 1623 CODADEBUG(CODA_SYMLINK, myprintf(("in symlink result %d\n",error)); ) 1624 return(error); 1625 } 1626 1627 /* 1628 * Read directory entries. 1629 */ 1630 int 1631 coda_readdir(void *v) 1632 { 1633 /* true args */ 1634 struct vop_readdir_args *ap = v; 1635 struct vnode *vp = ap->a_vp; 1636 struct cnode *cp = VTOC(vp); 1637 struct uio *uiop = ap->a_uio; 1638 kauth_cred_t cred = ap->a_cred; 1639 int *eofflag = ap->a_eofflag; 1640 off_t **cookies = ap->a_cookies; 1641 int *ncookies = ap->a_ncookies; 1642 /* upcall decl */ 1643 /* locals */ 1644 int error = 0; 1645 1646 MARK_ENTRY(CODA_READDIR_STATS); 1647 1648 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)); ) 1649 1650 /* Check for readdir of control object. */ 1651 if (IS_CTL_VP(vp)) { 1652 MARK_INT_FAIL(CODA_READDIR_STATS); 1653 return(ENOENT); 1654 } 1655 1656 { 1657 /* Redirect the request to UFS. */ 1658 1659 /* If directory is not already open do an "internal open" on it. */ 1660 int opened_internally = 0; 1661 if (cp->c_ovp == NULL) { 1662 opened_internally = 1; 1663 MARK_INT_GEN(CODA_OPEN_STATS); 1664 error = VOP_OPEN(vp, FREAD, cred); 1665 #ifdef CODA_VERBOSE 1666 printf("coda_readdir: Internally Opening %p\n", vp); 1667 #endif 1668 if (error) return(error); 1669 } else 1670 vp = cp->c_ovp; 1671 1672 /* Have UFS handle the call. */ 1673 CODADEBUG(CODA_READDIR, myprintf(( 1674 "indirect readdir: fid = %s, refcnt = %d\n", 1675 coda_f2s(&cp->c_fid), vp->v_usecount)); ) 1676 error = VOP_READDIR(vp, uiop, cred, eofflag, cookies, ncookies); 1677 if (error) 1678 MARK_INT_FAIL(CODA_READDIR_STATS); 1679 else 1680 MARK_INT_SAT(CODA_READDIR_STATS); 1681 1682 /* Do an "internal close" if necessary. */ 1683 if (opened_internally) { 1684 MARK_INT_GEN(CODA_CLOSE_STATS); 1685 (void)VOP_CLOSE(vp, FREAD, cred); 1686 } 1687 } 1688 1689 return(error); 1690 } 1691 1692 /* 1693 * Convert from file system blocks to device blocks 1694 */ 1695 int 1696 coda_bmap(void *v) 1697 { 1698 /* XXX on the global proc */ 1699 /* true args */ 1700 struct vop_bmap_args *ap = v; 1701 struct vnode *vp __unused = ap->a_vp; /* file's vnode */ 1702 daddr_t bn __unused = ap->a_bn; /* fs block number */ 1703 struct vnode **vpp = ap->a_vpp; /* RETURN vp of device */ 1704 daddr_t *bnp __unused = ap->a_bnp; /* RETURN device block number */ 1705 struct lwp *l __unused = curlwp; 1706 /* upcall decl */ 1707 /* locals */ 1708 1709 *vpp = (struct vnode *)0; 1710 myprintf(("coda_bmap called!\n")); 1711 return(EINVAL); 1712 } 1713 1714 /* 1715 * I don't think the following two things are used anywhere, so I've 1716 * commented them out 1717 * 1718 * struct buf *async_bufhead; 1719 * int async_daemon_count; 1720 */ 1721 int 1722 coda_strategy(void *v) 1723 { 1724 /* true args */ 1725 struct vop_strategy_args *ap = v; 1726 struct buf *bp __unused = ap->a_bp; 1727 struct lwp *l __unused = curlwp; 1728 /* upcall decl */ 1729 /* locals */ 1730 1731 myprintf(("coda_strategy called! ")); 1732 return(EINVAL); 1733 } 1734 1735 int 1736 coda_reclaim(void *v) 1737 { 1738 /* true args */ 1739 struct vop_reclaim_args *ap = v; 1740 struct vnode *vp = ap->a_vp; 1741 struct cnode *cp = VTOC(vp); 1742 /* upcall decl */ 1743 /* locals */ 1744 1745 /* 1746 * Forced unmount/flush will let vnodes with non zero use be destroyed! 1747 */ 1748 ENTRY; 1749 1750 if (IS_UNMOUNTING(cp)) { 1751 #ifdef DEBUG 1752 if (VTOC(vp)->c_ovp) { 1753 if (IS_UNMOUNTING(cp)) 1754 printf("coda_reclaim: c_ovp not void: vp %p, cp %p\n", vp, cp); 1755 } 1756 #endif 1757 } else { 1758 #ifdef OLD_DIAGNOSTIC 1759 if (vp->v_usecount != 0) 1760 print("coda_reclaim: pushing active %p\n", vp); 1761 if (VTOC(vp)->c_ovp) { 1762 panic("coda_reclaim: c_ovp not void"); 1763 } 1764 #endif 1765 } 1766 cache_purge(vp); 1767 coda_free(VTOC(vp)); 1768 SET_VTOC(vp) = NULL; 1769 return (0); 1770 } 1771 1772 int 1773 coda_lock(void *v) 1774 { 1775 /* true args */ 1776 struct vop_lock_args *ap = v; 1777 struct vnode *vp = ap->a_vp; 1778 struct cnode *cp = VTOC(vp); 1779 int flags = ap->a_flags; 1780 /* upcall decl */ 1781 /* locals */ 1782 1783 ENTRY; 1784 1785 if (coda_lockdebug) { 1786 myprintf(("Attempting lock on %s\n", 1787 coda_f2s(&cp->c_fid))); 1788 } 1789 1790 if ((flags & LK_INTERLOCK) != 0) { 1791 mutex_exit(&vp->v_interlock); 1792 flags &= ~LK_INTERLOCK; 1793 } 1794 1795 return (vlockmgr(&vp->v_lock, flags)); 1796 } 1797 1798 int 1799 coda_unlock(void *v) 1800 { 1801 /* true args */ 1802 struct vop_unlock_args *ap = v; 1803 struct vnode *vp = ap->a_vp; 1804 struct cnode *cp = VTOC(vp); 1805 /* upcall decl */ 1806 /* locals */ 1807 1808 ENTRY; 1809 if (coda_lockdebug) { 1810 myprintf(("Attempting unlock on %s\n", 1811 coda_f2s(&cp->c_fid))); 1812 } 1813 1814 return (vlockmgr(&vp->v_lock, ap->a_flags | LK_RELEASE)); 1815 } 1816 1817 int 1818 coda_islocked(void *v) 1819 { 1820 /* true args */ 1821 struct vop_islocked_args *ap = v; 1822 ENTRY; 1823 1824 return (vlockstatus(&ap->a_vp->v_lock)); 1825 } 1826 1827 /* 1828 * Given a device and inode, obtain a locked vnode. One reference is 1829 * obtained and passed back to the caller. 1830 */ 1831 int 1832 coda_grab_vnode(dev_t dev, ino_t ino, struct vnode **vpp) 1833 { 1834 int error; 1835 struct mount *mp; 1836 1837 /* Obtain mount point structure from device. */ 1838 if (!(mp = devtomp(dev))) { 1839 myprintf(("coda_grab_vnode: devtomp(0x%llx) returns NULL\n", 1840 (unsigned long long)dev)); 1841 return(ENXIO); 1842 } 1843 1844 /* 1845 * Obtain vnode from mount point and inode. 1846 * XXX VFS_VGET does not clearly define locked/referenced state of 1847 * returned vnode. 1848 */ 1849 error = VFS_VGET(mp, ino, vpp); 1850 if (error) { 1851 myprintf(("coda_grab_vnode: iget/vget(0x%llx, %llu) returns %p, err %d\n", 1852 (unsigned long long)dev, (unsigned long long)ino, *vpp, error)); 1853 return(ENOENT); 1854 } 1855 return(0); 1856 } 1857 1858 void 1859 print_vattr(struct vattr *attr) 1860 { 1861 const char *typestr; 1862 1863 switch (attr->va_type) { 1864 case VNON: 1865 typestr = "VNON"; 1866 break; 1867 case VREG: 1868 typestr = "VREG"; 1869 break; 1870 case VDIR: 1871 typestr = "VDIR"; 1872 break; 1873 case VBLK: 1874 typestr = "VBLK"; 1875 break; 1876 case VCHR: 1877 typestr = "VCHR"; 1878 break; 1879 case VLNK: 1880 typestr = "VLNK"; 1881 break; 1882 case VSOCK: 1883 typestr = "VSCK"; 1884 break; 1885 case VFIFO: 1886 typestr = "VFFO"; 1887 break; 1888 case VBAD: 1889 typestr = "VBAD"; 1890 break; 1891 default: 1892 typestr = "????"; 1893 break; 1894 } 1895 1896 1897 myprintf(("attr: type %s mode %d uid %d gid %d fsid %d rdev %d\n", 1898 typestr, (int)attr->va_mode, (int)attr->va_uid, 1899 (int)attr->va_gid, (int)attr->va_fsid, (int)attr->va_rdev)); 1900 1901 myprintf((" fileid %d nlink %d size %d blocksize %d bytes %d\n", 1902 (int)attr->va_fileid, (int)attr->va_nlink, 1903 (int)attr->va_size, 1904 (int)attr->va_blocksize,(int)attr->va_bytes)); 1905 myprintf((" gen %ld flags %ld vaflags %d\n", 1906 attr->va_gen, attr->va_flags, attr->va_vaflags)); 1907 myprintf((" atime sec %d nsec %d\n", 1908 (int)attr->va_atime.tv_sec, (int)attr->va_atime.tv_nsec)); 1909 myprintf((" mtime sec %d nsec %d\n", 1910 (int)attr->va_mtime.tv_sec, (int)attr->va_mtime.tv_nsec)); 1911 myprintf((" ctime sec %d nsec %d\n", 1912 (int)attr->va_ctime.tv_sec, (int)attr->va_ctime.tv_nsec)); 1913 } 1914 1915 /* How to print a ucred */ 1916 void 1917 print_cred(kauth_cred_t cred) 1918 { 1919 1920 uint16_t ngroups; 1921 int i; 1922 1923 myprintf(("ref %d\tuid %d\n", kauth_cred_getrefcnt(cred), 1924 kauth_cred_geteuid(cred))); 1925 1926 ngroups = kauth_cred_ngroups(cred); 1927 for (i=0; i < ngroups; i++) 1928 myprintf(("\tgroup %d: (%d)\n", i, kauth_cred_group(cred, i))); 1929 myprintf(("\n")); 1930 1931 } 1932 1933 /* 1934 * Return a vnode for the given fid. 1935 * If no cnode exists for this fid create one and put it 1936 * in a table hashed by coda_f2i(). If the cnode for 1937 * this fid is already in the table return it (ref count is 1938 * incremented by coda_find. The cnode will be flushed from the 1939 * table when coda_inactive calls coda_unsave. 1940 */ 1941 struct cnode * 1942 make_coda_node(CodaFid *fid, struct mount *vfsp, short type) 1943 { 1944 struct cnode *cp; 1945 int err; 1946 1947 if ((cp = coda_find(fid)) == NULL) { 1948 struct vnode *vp; 1949 1950 cp = coda_alloc(); 1951 cp->c_fid = *fid; 1952 1953 err = getnewvnode(VT_CODA, vfsp, coda_vnodeop_p, &vp); 1954 if (err) { 1955 panic("coda: getnewvnode returned error %d", err); 1956 } 1957 vp->v_data = cp; 1958 vp->v_type = type; 1959 cp->c_vnode = vp; 1960 uvm_vnp_setsize(vp, 0); 1961 coda_save(cp); 1962 1963 } else { 1964 vref(CTOV(cp)); 1965 } 1966 1967 return cp; 1968 } 1969 1970 /* 1971 * coda_getpages may be called on a vnode which has not been opened, 1972 * e.g. to fault in pages to execute a program. In that case, we must 1973 * open the file to get the container. The vnode may or may not be 1974 * locked, and we must leave it in the same state. 1975 * XXX The protocol requires v_uobj.vmobjlock to be 1976 * held by caller, but this isn't documented in vnodeops(9) or vnode_if.src. 1977 */ 1978 int 1979 coda_getpages(void *v) 1980 { 1981 struct vop_getpages_args /* { 1982 struct vnode *a_vp; 1983 voff_t a_offset; 1984 struct vm_page **a_m; 1985 int *a_count; 1986 int a_centeridx; 1987 vm_prot_t a_access_type; 1988 int a_advice; 1989 int a_flags; 1990 } */ *ap = v; 1991 struct vnode *vp = ap->a_vp; 1992 struct cnode *cp = VTOC(vp); 1993 struct lwp *l = curlwp; 1994 kauth_cred_t cred = l->l_cred; 1995 int error, cerror; 1996 int waslocked; /* 1 if vnode lock was held on entry */ 1997 int didopen = 0; /* 1 if we opened container file */ 1998 1999 /* 2000 * Handle a case that uvm_fault doesn't quite use yet. 2001 * See layer_vnops.c. for inspiration. 2002 */ 2003 if (ap->a_flags & PGO_LOCKED) { 2004 return EBUSY; 2005 } 2006 2007 /* Check for control object. */ 2008 if (IS_CTL_VP(vp)) { 2009 printf("coda_getpages: control object %p\n", vp); 2010 mutex_exit(&vp->v_uobj.vmobjlock); 2011 return(EINVAL); 2012 } 2013 2014 /* 2015 * XXX It's really not ok to be releasing the lock we get, 2016 * because we could be overlapping with another call to 2017 * getpages and drop a lock they are relying on. We need to 2018 * figure out whether getpages ever is called holding the 2019 * lock, and if we should serialize getpages calls by some 2020 * mechanism. 2021 */ 2022 waslocked = VOP_ISLOCKED(vp); 2023 2024 /* Drop the vmobject lock. */ 2025 mutex_exit(&vp->v_uobj.vmobjlock); 2026 2027 /* Get container file if not already present. */ 2028 if (cp->c_ovp == NULL) { 2029 /* 2030 * VOP_OPEN requires a locked vnode. We must avoid 2031 * locking the vnode if it is already locked, and 2032 * leave it in the same state on exit. 2033 */ 2034 if (waslocked == 0) { 2035 cerror = vn_lock(vp, LK_EXCLUSIVE); 2036 if (cerror) { 2037 printf("coda_getpages: can't lock vnode %p\n", 2038 vp); 2039 return cerror; 2040 } 2041 #if 0 2042 printf("coda_getpages: locked vnode %p\n", vp); 2043 #endif 2044 } 2045 2046 /* 2047 * Open file (causes upcall to venus). 2048 * XXX Perhaps we should not fully open the file, but 2049 * simply obtain a container file. 2050 */ 2051 /* XXX Is it ok to do this while holding the simplelock? */ 2052 cerror = VOP_OPEN(vp, FREAD, cred); 2053 2054 if (cerror) { 2055 printf("coda_getpages: cannot open vnode %p => %d\n", 2056 vp, cerror); 2057 if (waslocked == 0) 2058 VOP_UNLOCK(vp, 0); 2059 return cerror; 2060 } 2061 2062 #if 0 2063 printf("coda_getpages: opened vnode %p\n", vp); 2064 #endif 2065 didopen = 1; 2066 } 2067 KASSERT(cp->c_ovp != NULL); 2068 2069 /* Munge the arg structure to refer to the container vnode. */ 2070 ap->a_vp = cp->c_ovp; 2071 2072 /* Get the lock on the container vnode, and call getpages on it. */ 2073 mutex_enter(&ap->a_vp->v_uobj.vmobjlock); 2074 error = VCALL(ap->a_vp, VOFFSET(vop_getpages), ap); 2075 2076 /* If we opened the vnode, we must close it. */ 2077 if (didopen) { 2078 /* 2079 * VOP_CLOSE requires a locked vnode, but we are still 2080 * holding the lock (or riding a caller's lock). 2081 */ 2082 cerror = VOP_CLOSE(vp, FREAD, cred); 2083 if (cerror != 0) 2084 /* XXX How should we handle this? */ 2085 printf("coda_getpages: closed vnode %p -> %d\n", 2086 vp, cerror); 2087 2088 /* If we obtained a lock, drop it. */ 2089 if (waslocked == 0) 2090 VOP_UNLOCK(vp, 0); 2091 } 2092 2093 return error; 2094 } 2095 2096 /* 2097 * The protocol requires v_uobj.vmobjlock to be held by the caller, as 2098 * documented in vnodeops(9). XXX vnode_if.src doesn't say this. 2099 */ 2100 int 2101 coda_putpages(void *v) 2102 { 2103 struct vop_putpages_args /* { 2104 struct vnode *a_vp; 2105 voff_t a_offlo; 2106 voff_t a_offhi; 2107 int a_flags; 2108 } */ *ap = v; 2109 struct vnode *vp = ap->a_vp; 2110 struct cnode *cp = VTOC(vp); 2111 int error; 2112 2113 /* Drop the vmobject lock. */ 2114 mutex_exit(&vp->v_uobj.vmobjlock); 2115 2116 /* Check for control object. */ 2117 if (IS_CTL_VP(vp)) { 2118 printf("coda_putpages: control object %p\n", vp); 2119 return(EINVAL); 2120 } 2121 2122 /* 2123 * If container object is not present, then there are no pages 2124 * to put; just return without error. This happens all the 2125 * time, apparently during discard of a closed vnode (which 2126 * trivially can't have dirty pages). 2127 */ 2128 if (cp->c_ovp == NULL) 2129 return 0; 2130 2131 /* Munge the arg structure to refer to the container vnode. */ 2132 ap->a_vp = cp->c_ovp; 2133 2134 /* Get the lock on the container vnode, and call putpages on it. */ 2135 mutex_enter(&ap->a_vp->v_uobj.vmobjlock); 2136 error = VCALL(ap->a_vp, VOFFSET(vop_putpages), ap); 2137 2138 return error; 2139 } 2140
Indexes created Fri Oct 17 03:10:13 GMT 2025