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sys/fs/tmpfs/tmpfs_vnops.c
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1 /* $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $ */ 2 3 /*- 4 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 9 * 2005 program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * tmpfs vnode interface. 35 */ 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD: releng/10.0/sys/fs/tmpfs/tmpfs_vnops.c 254601 2013-08-21 17:23:24Z kib $"); 38 39 #include <sys/param.h> 40 #include <sys/fcntl.h> 41 #include <sys/lockf.h> 42 #include <sys/lock.h> 43 #include <sys/namei.h> 44 #include <sys/priv.h> 45 #include <sys/proc.h> 46 #include <sys/rwlock.h> 47 #include <sys/sched.h> 48 #include <sys/sf_buf.h> 49 #include <sys/stat.h> 50 #include <sys/systm.h> 51 #include <sys/sysctl.h> 52 #include <sys/unistd.h> 53 #include <sys/vnode.h> 54 55 #include <vm/vm.h> 56 #include <vm/vm_param.h> 57 #include <vm/vm_object.h> 58 #include <vm/vm_page.h> 59 #include <vm/vm_pager.h> 60 61 #include <fs/tmpfs/tmpfs_vnops.h> 62 #include <fs/tmpfs/tmpfs.h> 63 64 SYSCTL_DECL(_vfs_tmpfs); 65 66 static volatile int tmpfs_rename_restarts; 67 SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD, 68 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0, 69 "Times rename had to restart due to lock contention"); 70 71 /* --------------------------------------------------------------------- */ 72 73 static int 74 tmpfs_lookup(struct vop_cachedlookup_args *v) 75 { 76 struct vnode *dvp = v->a_dvp; 77 struct vnode **vpp = v->a_vpp; 78 struct componentname *cnp = v->a_cnp; 79 80 int error; 81 struct tmpfs_dirent *de; 82 struct tmpfs_node *dnode; 83 84 dnode = VP_TO_TMPFS_DIR(dvp); 85 *vpp = NULLVP; 86 87 /* Check accessibility of requested node as a first step. */ 88 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 89 if (error != 0) 90 goto out; 91 92 /* We cannot be requesting the parent directory of the root node. */ 93 MPASS(IMPLIES(dnode->tn_type == VDIR && 94 dnode->tn_dir.tn_parent == dnode, 95 !(cnp->cn_flags & ISDOTDOT))); 96 97 TMPFS_ASSERT_LOCKED(dnode); 98 if (dnode->tn_dir.tn_parent == NULL) { 99 error = ENOENT; 100 goto out; 101 } 102 if (cnp->cn_flags & ISDOTDOT) { 103 int ltype = 0; 104 105 ltype = VOP_ISLOCKED(dvp); 106 vhold(dvp); 107 VOP_UNLOCK(dvp, 0); 108 /* Allocate a new vnode on the matching entry. */ 109 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent, 110 cnp->cn_lkflags, vpp); 111 112 vn_lock(dvp, ltype | LK_RETRY); 113 vdrop(dvp); 114 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 115 VREF(dvp); 116 *vpp = dvp; 117 error = 0; 118 } else { 119 de = tmpfs_dir_lookup(dnode, NULL, cnp); 120 if (de != NULL && de->td_node == NULL) 121 cnp->cn_flags |= ISWHITEOUT; 122 if (de == NULL || de->td_node == NULL) { 123 /* The entry was not found in the directory. 124 * This is OK if we are creating or renaming an 125 * entry and are working on the last component of 126 * the path name. */ 127 if ((cnp->cn_flags & ISLASTCN) && 128 (cnp->cn_nameiop == CREATE || \ 129 cnp->cn_nameiop == RENAME || 130 (cnp->cn_nameiop == DELETE && 131 cnp->cn_flags & DOWHITEOUT && 132 cnp->cn_flags & ISWHITEOUT))) { 133 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 134 cnp->cn_thread); 135 if (error != 0) 136 goto out; 137 138 /* Keep the component name in the buffer for 139 * future uses. */ 140 cnp->cn_flags |= SAVENAME; 141 142 error = EJUSTRETURN; 143 } else 144 error = ENOENT; 145 } else { 146 struct tmpfs_node *tnode; 147 148 /* The entry was found, so get its associated 149 * tmpfs_node. */ 150 tnode = de->td_node; 151 152 /* If we are not at the last path component and 153 * found a non-directory or non-link entry (which 154 * may itself be pointing to a directory), raise 155 * an error. */ 156 if ((tnode->tn_type != VDIR && 157 tnode->tn_type != VLNK) && 158 !(cnp->cn_flags & ISLASTCN)) { 159 error = ENOTDIR; 160 goto out; 161 } 162 163 /* If we are deleting or renaming the entry, keep 164 * track of its tmpfs_dirent so that it can be 165 * easily deleted later. */ 166 if ((cnp->cn_flags & ISLASTCN) && 167 (cnp->cn_nameiop == DELETE || 168 cnp->cn_nameiop == RENAME)) { 169 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 170 cnp->cn_thread); 171 if (error != 0) 172 goto out; 173 174 /* Allocate a new vnode on the matching entry. */ 175 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 176 cnp->cn_lkflags, vpp); 177 if (error != 0) 178 goto out; 179 180 if ((dnode->tn_mode & S_ISTXT) && 181 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) && 182 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) { 183 error = EPERM; 184 vput(*vpp); 185 *vpp = NULL; 186 goto out; 187 } 188 cnp->cn_flags |= SAVENAME; 189 } else { 190 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 191 cnp->cn_lkflags, vpp); 192 } 193 } 194 } 195 196 /* Store the result of this lookup in the cache. Avoid this if the 197 * request was for creation, as it does not improve timings on 198 * emprical tests. */ 199 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 200 cache_enter(dvp, *vpp, cnp); 201 202 out: 203 /* If there were no errors, *vpp cannot be null and it must be 204 * locked. */ 205 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 206 207 return error; 208 } 209 210 /* --------------------------------------------------------------------- */ 211 212 static int 213 tmpfs_create(struct vop_create_args *v) 214 { 215 struct vnode *dvp = v->a_dvp; 216 struct vnode **vpp = v->a_vpp; 217 struct componentname *cnp = v->a_cnp; 218 struct vattr *vap = v->a_vap; 219 220 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 221 222 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 223 } 224 /* --------------------------------------------------------------------- */ 225 226 static int 227 tmpfs_mknod(struct vop_mknod_args *v) 228 { 229 struct vnode *dvp = v->a_dvp; 230 struct vnode **vpp = v->a_vpp; 231 struct componentname *cnp = v->a_cnp; 232 struct vattr *vap = v->a_vap; 233 234 if (vap->va_type != VBLK && vap->va_type != VCHR && 235 vap->va_type != VFIFO) 236 return EINVAL; 237 238 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 239 } 240 241 /* --------------------------------------------------------------------- */ 242 243 static int 244 tmpfs_open(struct vop_open_args *v) 245 { 246 struct vnode *vp = v->a_vp; 247 int mode = v->a_mode; 248 249 int error; 250 struct tmpfs_node *node; 251 252 MPASS(VOP_ISLOCKED(vp)); 253 254 node = VP_TO_TMPFS_NODE(vp); 255 256 /* The file is still active but all its names have been removed 257 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 258 * it is about to die. */ 259 if (node->tn_links < 1) 260 return (ENOENT); 261 262 /* If the file is marked append-only, deny write requests. */ 263 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 264 error = EPERM; 265 else { 266 error = 0; 267 /* For regular files, the call below is nop. */ 268 vnode_create_vobject(vp, node->tn_size, v->a_td); 269 } 270 271 MPASS(VOP_ISLOCKED(vp)); 272 return error; 273 } 274 275 /* --------------------------------------------------------------------- */ 276 277 static int 278 tmpfs_close(struct vop_close_args *v) 279 { 280 struct vnode *vp = v->a_vp; 281 282 /* Update node times. */ 283 tmpfs_update(vp); 284 285 return (0); 286 } 287 288 /* --------------------------------------------------------------------- */ 289 290 int 291 tmpfs_access(struct vop_access_args *v) 292 { 293 struct vnode *vp = v->a_vp; 294 accmode_t accmode = v->a_accmode; 295 struct ucred *cred = v->a_cred; 296 297 int error; 298 struct tmpfs_node *node; 299 300 MPASS(VOP_ISLOCKED(vp)); 301 302 node = VP_TO_TMPFS_NODE(vp); 303 304 switch (vp->v_type) { 305 case VDIR: 306 /* FALLTHROUGH */ 307 case VLNK: 308 /* FALLTHROUGH */ 309 case VREG: 310 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 311 error = EROFS; 312 goto out; 313 } 314 break; 315 316 case VBLK: 317 /* FALLTHROUGH */ 318 case VCHR: 319 /* FALLTHROUGH */ 320 case VSOCK: 321 /* FALLTHROUGH */ 322 case VFIFO: 323 break; 324 325 default: 326 error = EINVAL; 327 goto out; 328 } 329 330 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 331 error = EPERM; 332 goto out; 333 } 334 335 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 336 node->tn_gid, accmode, cred, NULL); 337 338 out: 339 MPASS(VOP_ISLOCKED(vp)); 340 341 return error; 342 } 343 344 /* --------------------------------------------------------------------- */ 345 346 int 347 tmpfs_getattr(struct vop_getattr_args *v) 348 { 349 struct vnode *vp = v->a_vp; 350 struct vattr *vap = v->a_vap; 351 352 struct tmpfs_node *node; 353 354 node = VP_TO_TMPFS_NODE(vp); 355 356 tmpfs_update(vp); 357 358 vap->va_type = vp->v_type; 359 vap->va_mode = node->tn_mode; 360 vap->va_nlink = node->tn_links; 361 vap->va_uid = node->tn_uid; 362 vap->va_gid = node->tn_gid; 363 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 364 vap->va_fileid = node->tn_id; 365 vap->va_size = node->tn_size; 366 vap->va_blocksize = PAGE_SIZE; 367 vap->va_atime = node->tn_atime; 368 vap->va_mtime = node->tn_mtime; 369 vap->va_ctime = node->tn_ctime; 370 vap->va_birthtime = node->tn_birthtime; 371 vap->va_gen = node->tn_gen; 372 vap->va_flags = node->tn_flags; 373 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 374 node->tn_rdev : NODEV; 375 vap->va_bytes = round_page(node->tn_size); 376 vap->va_filerev = 0; 377 378 return 0; 379 } 380 381 /* --------------------------------------------------------------------- */ 382 383 /* XXX Should this operation be atomic? I think it should, but code in 384 * XXX other places (e.g., ufs) doesn't seem to be... */ 385 int 386 tmpfs_setattr(struct vop_setattr_args *v) 387 { 388 struct vnode *vp = v->a_vp; 389 struct vattr *vap = v->a_vap; 390 struct ucred *cred = v->a_cred; 391 struct thread *td = curthread; 392 393 int error; 394 395 MPASS(VOP_ISLOCKED(vp)); 396 397 error = 0; 398 399 /* Abort if any unsettable attribute is given. */ 400 if (vap->va_type != VNON || 401 vap->va_nlink != VNOVAL || 402 vap->va_fsid != VNOVAL || 403 vap->va_fileid != VNOVAL || 404 vap->va_blocksize != VNOVAL || 405 vap->va_gen != VNOVAL || 406 vap->va_rdev != VNOVAL || 407 vap->va_bytes != VNOVAL) 408 error = EINVAL; 409 410 if (error == 0 && (vap->va_flags != VNOVAL)) 411 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 412 413 if (error == 0 && (vap->va_size != VNOVAL)) 414 error = tmpfs_chsize(vp, vap->va_size, cred, td); 415 416 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 417 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 418 419 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 420 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 421 422 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 423 vap->va_atime.tv_nsec != VNOVAL) || 424 (vap->va_mtime.tv_sec != VNOVAL && 425 vap->va_mtime.tv_nsec != VNOVAL) || 426 (vap->va_birthtime.tv_sec != VNOVAL && 427 vap->va_birthtime.tv_nsec != VNOVAL))) 428 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 429 &vap->va_birthtime, vap->va_vaflags, cred, td); 430 431 /* Update the node times. We give preference to the error codes 432 * generated by this function rather than the ones that may arise 433 * from tmpfs_update. */ 434 tmpfs_update(vp); 435 436 MPASS(VOP_ISLOCKED(vp)); 437 438 return error; 439 } 440 441 static int 442 tmpfs_read(struct vop_read_args *v) 443 { 444 struct vnode *vp; 445 struct uio *uio; 446 struct tmpfs_node *node; 447 448 vp = v->a_vp; 449 if (vp->v_type != VREG) 450 return (EISDIR); 451 uio = v->a_uio; 452 if (uio->uio_offset < 0) 453 return (EINVAL); 454 node = VP_TO_TMPFS_NODE(vp); 455 node->tn_status |= TMPFS_NODE_ACCESSED; 456 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio)); 457 } 458 459 static int 460 tmpfs_write(struct vop_write_args *v) 461 { 462 struct vnode *vp; 463 struct uio *uio; 464 struct tmpfs_node *node; 465 off_t oldsize; 466 int error, ioflag; 467 boolean_t extended; 468 469 vp = v->a_vp; 470 uio = v->a_uio; 471 ioflag = v->a_ioflag; 472 error = 0; 473 node = VP_TO_TMPFS_NODE(vp); 474 oldsize = node->tn_size; 475 476 if (uio->uio_offset < 0 || vp->v_type != VREG) 477 return (EINVAL); 478 if (uio->uio_resid == 0) 479 return (0); 480 if (ioflag & IO_APPEND) 481 uio->uio_offset = node->tn_size; 482 if (uio->uio_offset + uio->uio_resid > 483 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 484 return (EFBIG); 485 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 486 return (EFBIG); 487 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 488 if (extended) { 489 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 490 FALSE); 491 if (error != 0) 492 goto out; 493 } 494 495 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio); 496 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 497 (extended ? TMPFS_NODE_CHANGED : 0); 498 if (node->tn_mode & (S_ISUID | S_ISGID)) { 499 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 500 node->tn_mode &= ~(S_ISUID | S_ISGID); 501 } 502 if (error != 0) 503 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 504 505 out: 506 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 507 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 508 509 return (error); 510 } 511 512 /* --------------------------------------------------------------------- */ 513 514 static int 515 tmpfs_fsync(struct vop_fsync_args *v) 516 { 517 struct vnode *vp = v->a_vp; 518 519 MPASS(VOP_ISLOCKED(vp)); 520 521 tmpfs_update(vp); 522 523 return 0; 524 } 525 526 /* --------------------------------------------------------------------- */ 527 528 static int 529 tmpfs_remove(struct vop_remove_args *v) 530 { 531 struct vnode *dvp = v->a_dvp; 532 struct vnode *vp = v->a_vp; 533 534 int error; 535 struct tmpfs_dirent *de; 536 struct tmpfs_mount *tmp; 537 struct tmpfs_node *dnode; 538 struct tmpfs_node *node; 539 540 MPASS(VOP_ISLOCKED(dvp)); 541 MPASS(VOP_ISLOCKED(vp)); 542 543 if (vp->v_type == VDIR) { 544 error = EISDIR; 545 goto out; 546 } 547 548 dnode = VP_TO_TMPFS_DIR(dvp); 549 node = VP_TO_TMPFS_NODE(vp); 550 tmp = VFS_TO_TMPFS(vp->v_mount); 551 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 552 MPASS(de != NULL); 553 554 /* Files marked as immutable or append-only cannot be deleted. */ 555 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 556 (dnode->tn_flags & APPEND)) { 557 error = EPERM; 558 goto out; 559 } 560 561 /* Remove the entry from the directory; as it is a file, we do not 562 * have to change the number of hard links of the directory. */ 563 tmpfs_dir_detach(dvp, de); 564 if (v->a_cnp->cn_flags & DOWHITEOUT) 565 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 566 567 /* Free the directory entry we just deleted. Note that the node 568 * referred by it will not be removed until the vnode is really 569 * reclaimed. */ 570 tmpfs_free_dirent(tmp, de); 571 572 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 573 error = 0; 574 575 out: 576 577 return error; 578 } 579 580 /* --------------------------------------------------------------------- */ 581 582 static int 583 tmpfs_link(struct vop_link_args *v) 584 { 585 struct vnode *dvp = v->a_tdvp; 586 struct vnode *vp = v->a_vp; 587 struct componentname *cnp = v->a_cnp; 588 589 int error; 590 struct tmpfs_dirent *de; 591 struct tmpfs_node *node; 592 593 MPASS(VOP_ISLOCKED(dvp)); 594 MPASS(cnp->cn_flags & HASBUF); 595 MPASS(dvp != vp); /* XXX When can this be false? */ 596 597 node = VP_TO_TMPFS_NODE(vp); 598 599 /* XXX: Why aren't the following two tests done by the caller? */ 600 601 /* Hard links of directories are forbidden. */ 602 if (vp->v_type == VDIR) { 603 error = EPERM; 604 goto out; 605 } 606 607 /* Cannot create cross-device links. */ 608 if (dvp->v_mount != vp->v_mount) { 609 error = EXDEV; 610 goto out; 611 } 612 613 /* Ensure that we do not overflow the maximum number of links imposed 614 * by the system. */ 615 MPASS(node->tn_links <= LINK_MAX); 616 if (node->tn_links == LINK_MAX) { 617 error = EMLINK; 618 goto out; 619 } 620 621 /* We cannot create links of files marked immutable or append-only. */ 622 if (node->tn_flags & (IMMUTABLE | APPEND)) { 623 error = EPERM; 624 goto out; 625 } 626 627 /* Allocate a new directory entry to represent the node. */ 628 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 629 cnp->cn_nameptr, cnp->cn_namelen, &de); 630 if (error != 0) 631 goto out; 632 633 /* Insert the new directory entry into the appropriate directory. */ 634 if (cnp->cn_flags & ISWHITEOUT) 635 tmpfs_dir_whiteout_remove(dvp, cnp); 636 tmpfs_dir_attach(dvp, de); 637 638 /* vp link count has changed, so update node times. */ 639 node->tn_status |= TMPFS_NODE_CHANGED; 640 tmpfs_update(vp); 641 642 error = 0; 643 644 out: 645 return error; 646 } 647 648 /* --------------------------------------------------------------------- */ 649 650 /* 651 * We acquire all but fdvp locks using non-blocking acquisitions. If we 652 * fail to acquire any lock in the path we will drop all held locks, 653 * acquire the new lock in a blocking fashion, and then release it and 654 * restart the rename. This acquire/release step ensures that we do not 655 * spin on a lock waiting for release. On error release all vnode locks 656 * and decrement references the way tmpfs_rename() would do. 657 */ 658 static int 659 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 660 struct vnode *tdvp, struct vnode **tvpp, 661 struct componentname *fcnp, struct componentname *tcnp) 662 { 663 struct vnode *nvp; 664 struct mount *mp; 665 struct tmpfs_dirent *de; 666 int error, restarts = 0; 667 668 VOP_UNLOCK(tdvp, 0); 669 if (*tvpp != NULL && *tvpp != tdvp) 670 VOP_UNLOCK(*tvpp, 0); 671 mp = fdvp->v_mount; 672 673 relock: 674 restarts += 1; 675 error = vn_lock(fdvp, LK_EXCLUSIVE); 676 if (error) 677 goto releout; 678 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 679 VOP_UNLOCK(fdvp, 0); 680 error = vn_lock(tdvp, LK_EXCLUSIVE); 681 if (error) 682 goto releout; 683 VOP_UNLOCK(tdvp, 0); 684 goto relock; 685 } 686 /* 687 * Re-resolve fvp to be certain it still exists and fetch the 688 * correct vnode. 689 */ 690 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 691 if (de == NULL) { 692 VOP_UNLOCK(fdvp, 0); 693 VOP_UNLOCK(tdvp, 0); 694 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 695 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 696 error = EINVAL; 697 else 698 error = ENOENT; 699 goto releout; 700 } 701 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 702 if (error != 0) { 703 VOP_UNLOCK(fdvp, 0); 704 VOP_UNLOCK(tdvp, 0); 705 if (error != EBUSY) 706 goto releout; 707 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 708 if (error != 0) 709 goto releout; 710 VOP_UNLOCK(nvp, 0); 711 /* 712 * Concurrent rename race. 713 */ 714 if (nvp == tdvp) { 715 vrele(nvp); 716 error = EINVAL; 717 goto releout; 718 } 719 vrele(*fvpp); 720 *fvpp = nvp; 721 goto relock; 722 } 723 vrele(*fvpp); 724 *fvpp = nvp; 725 VOP_UNLOCK(*fvpp, 0); 726 /* 727 * Re-resolve tvp and acquire the vnode lock if present. 728 */ 729 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 730 /* 731 * If tvp disappeared we just carry on. 732 */ 733 if (de == NULL && *tvpp != NULL) { 734 vrele(*tvpp); 735 *tvpp = NULL; 736 } 737 /* 738 * Get the tvp ino if the lookup succeeded. We may have to restart 739 * if the non-blocking acquire fails. 740 */ 741 if (de != NULL) { 742 nvp = NULL; 743 error = tmpfs_alloc_vp(mp, de->td_node, 744 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 745 if (*tvpp != NULL) 746 vrele(*tvpp); 747 *tvpp = nvp; 748 if (error != 0) { 749 VOP_UNLOCK(fdvp, 0); 750 VOP_UNLOCK(tdvp, 0); 751 if (error != EBUSY) 752 goto releout; 753 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 754 &nvp); 755 if (error != 0) 756 goto releout; 757 VOP_UNLOCK(nvp, 0); 758 /* 759 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 760 */ 761 if (nvp == fdvp) { 762 error = ENOTEMPTY; 763 goto releout; 764 } 765 goto relock; 766 } 767 } 768 tmpfs_rename_restarts += restarts; 769 770 return (0); 771 772 releout: 773 vrele(fdvp); 774 vrele(*fvpp); 775 vrele(tdvp); 776 if (*tvpp != NULL) 777 vrele(*tvpp); 778 tmpfs_rename_restarts += restarts; 779 780 return (error); 781 } 782 783 static int 784 tmpfs_rename(struct vop_rename_args *v) 785 { 786 struct vnode *fdvp = v->a_fdvp; 787 struct vnode *fvp = v->a_fvp; 788 struct componentname *fcnp = v->a_fcnp; 789 struct vnode *tdvp = v->a_tdvp; 790 struct vnode *tvp = v->a_tvp; 791 struct componentname *tcnp = v->a_tcnp; 792 struct mount *mp = NULL; 793 794 char *newname; 795 int error; 796 struct tmpfs_dirent *de; 797 struct tmpfs_mount *tmp; 798 struct tmpfs_node *fdnode; 799 struct tmpfs_node *fnode; 800 struct tmpfs_node *tnode; 801 struct tmpfs_node *tdnode; 802 803 MPASS(VOP_ISLOCKED(tdvp)); 804 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 805 MPASS(fcnp->cn_flags & HASBUF); 806 MPASS(tcnp->cn_flags & HASBUF); 807 808 /* Disallow cross-device renames. 809 * XXX Why isn't this done by the caller? */ 810 if (fvp->v_mount != tdvp->v_mount || 811 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 812 error = EXDEV; 813 goto out; 814 } 815 816 /* If source and target are the same file, there is nothing to do. */ 817 if (fvp == tvp) { 818 error = 0; 819 goto out; 820 } 821 822 /* If we need to move the directory between entries, lock the 823 * source so that we can safely operate on it. */ 824 if (fdvp != tdvp && fdvp != tvp) { 825 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 826 mp = tdvp->v_mount; 827 error = vfs_busy(mp, 0); 828 if (error != 0) { 829 mp = NULL; 830 goto out; 831 } 832 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 833 fcnp, tcnp); 834 if (error != 0) { 835 vfs_unbusy(mp); 836 return (error); 837 } 838 ASSERT_VOP_ELOCKED(fdvp, 839 "tmpfs_rename: fdvp not locked"); 840 ASSERT_VOP_ELOCKED(tdvp, 841 "tmpfs_rename: tdvp not locked"); 842 if (tvp != NULL) 843 ASSERT_VOP_ELOCKED(tvp, 844 "tmpfs_rename: tvp not locked"); 845 if (fvp == tvp) { 846 error = 0; 847 goto out_locked; 848 } 849 } 850 } 851 852 tmp = VFS_TO_TMPFS(tdvp->v_mount); 853 tdnode = VP_TO_TMPFS_DIR(tdvp); 854 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 855 fdnode = VP_TO_TMPFS_DIR(fdvp); 856 fnode = VP_TO_TMPFS_NODE(fvp); 857 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 858 859 /* Entry can disappear before we lock fdvp, 860 * also avoid manipulating '.' and '..' entries. */ 861 if (de == NULL) { 862 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 863 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 864 error = EINVAL; 865 else 866 error = ENOENT; 867 goto out_locked; 868 } 869 MPASS(de->td_node == fnode); 870 871 /* If re-naming a directory to another preexisting directory 872 * ensure that the target directory is empty so that its 873 * removal causes no side effects. 874 * Kern_rename gurantees the destination to be a directory 875 * if the source is one. */ 876 if (tvp != NULL) { 877 MPASS(tnode != NULL); 878 879 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 880 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 881 error = EPERM; 882 goto out_locked; 883 } 884 885 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 886 if (tnode->tn_size > 0) { 887 error = ENOTEMPTY; 888 goto out_locked; 889 } 890 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 891 error = ENOTDIR; 892 goto out_locked; 893 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 894 error = EISDIR; 895 goto out_locked; 896 } else { 897 MPASS(fnode->tn_type != VDIR && 898 tnode->tn_type != VDIR); 899 } 900 } 901 902 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 903 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 904 error = EPERM; 905 goto out_locked; 906 } 907 908 /* Ensure that we have enough memory to hold the new name, if it 909 * has to be changed. */ 910 if (fcnp->cn_namelen != tcnp->cn_namelen || 911 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 912 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 913 } else 914 newname = NULL; 915 916 /* If the node is being moved to another directory, we have to do 917 * the move. */ 918 if (fdnode != tdnode) { 919 /* In case we are moving a directory, we have to adjust its 920 * parent to point to the new parent. */ 921 if (de->td_node->tn_type == VDIR) { 922 struct tmpfs_node *n; 923 924 /* Ensure the target directory is not a child of the 925 * directory being moved. Otherwise, we'd end up 926 * with stale nodes. */ 927 n = tdnode; 928 /* TMPFS_LOCK garanties that no nodes are freed while 929 * traversing the list. Nodes can only be marked as 930 * removed: tn_parent == NULL. */ 931 TMPFS_LOCK(tmp); 932 TMPFS_NODE_LOCK(n); 933 while (n != n->tn_dir.tn_parent) { 934 struct tmpfs_node *parent; 935 936 if (n == fnode) { 937 TMPFS_NODE_UNLOCK(n); 938 TMPFS_UNLOCK(tmp); 939 error = EINVAL; 940 if (newname != NULL) 941 free(newname, M_TMPFSNAME); 942 goto out_locked; 943 } 944 parent = n->tn_dir.tn_parent; 945 TMPFS_NODE_UNLOCK(n); 946 if (parent == NULL) { 947 n = NULL; 948 break; 949 } 950 TMPFS_NODE_LOCK(parent); 951 if (parent->tn_dir.tn_parent == NULL) { 952 TMPFS_NODE_UNLOCK(parent); 953 n = NULL; 954 break; 955 } 956 n = parent; 957 } 958 TMPFS_UNLOCK(tmp); 959 if (n == NULL) { 960 error = EINVAL; 961 if (newname != NULL) 962 free(newname, M_TMPFSNAME); 963 goto out_locked; 964 } 965 TMPFS_NODE_UNLOCK(n); 966 967 /* Adjust the parent pointer. */ 968 TMPFS_VALIDATE_DIR(fnode); 969 TMPFS_NODE_LOCK(de->td_node); 970 de->td_node->tn_dir.tn_parent = tdnode; 971 TMPFS_NODE_UNLOCK(de->td_node); 972 973 /* As a result of changing the target of the '..' 974 * entry, the link count of the source and target 975 * directories has to be adjusted. */ 976 TMPFS_NODE_LOCK(tdnode); 977 TMPFS_ASSERT_LOCKED(tdnode); 978 tdnode->tn_links++; 979 TMPFS_NODE_UNLOCK(tdnode); 980 981 TMPFS_NODE_LOCK(fdnode); 982 TMPFS_ASSERT_LOCKED(fdnode); 983 fdnode->tn_links--; 984 TMPFS_NODE_UNLOCK(fdnode); 985 } 986 } 987 988 /* Do the move: just remove the entry from the source directory 989 * and insert it into the target one. */ 990 tmpfs_dir_detach(fdvp, de); 991 992 if (fcnp->cn_flags & DOWHITEOUT) 993 tmpfs_dir_whiteout_add(fdvp, fcnp); 994 if (tcnp->cn_flags & ISWHITEOUT) 995 tmpfs_dir_whiteout_remove(tdvp, tcnp); 996 997 /* If the name has changed, we need to make it effective by changing 998 * it in the directory entry. */ 999 if (newname != NULL) { 1000 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1001 1002 free(de->ud.td_name, M_TMPFSNAME); 1003 de->ud.td_name = newname; 1004 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 1005 1006 fnode->tn_status |= TMPFS_NODE_CHANGED; 1007 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1008 } 1009 1010 /* If we are overwriting an entry, we have to remove the old one 1011 * from the target directory. */ 1012 if (tvp != NULL) { 1013 struct tmpfs_dirent *tde; 1014 1015 /* Remove the old entry from the target directory. */ 1016 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1017 tmpfs_dir_detach(tdvp, tde); 1018 1019 /* Free the directory entry we just deleted. Note that the 1020 * node referred by it will not be removed until the vnode is 1021 * really reclaimed. */ 1022 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1023 } 1024 1025 tmpfs_dir_attach(tdvp, de); 1026 1027 cache_purge(fvp); 1028 if (tvp != NULL) 1029 cache_purge(tvp); 1030 cache_purge_negative(tdvp); 1031 1032 error = 0; 1033 1034 out_locked: 1035 if (fdvp != tdvp && fdvp != tvp) 1036 VOP_UNLOCK(fdvp, 0); 1037 1038 out: 1039 /* Release target nodes. */ 1040 /* XXX: I don't understand when tdvp can be the same as tvp, but 1041 * other code takes care of this... */ 1042 if (tdvp == tvp) 1043 vrele(tdvp); 1044 else 1045 vput(tdvp); 1046 if (tvp != NULL) 1047 vput(tvp); 1048 1049 /* Release source nodes. */ 1050 vrele(fdvp); 1051 vrele(fvp); 1052 1053 if (mp != NULL) 1054 vfs_unbusy(mp); 1055 1056 return error; 1057 } 1058 1059 /* --------------------------------------------------------------------- */ 1060 1061 static int 1062 tmpfs_mkdir(struct vop_mkdir_args *v) 1063 { 1064 struct vnode *dvp = v->a_dvp; 1065 struct vnode **vpp = v->a_vpp; 1066 struct componentname *cnp = v->a_cnp; 1067 struct vattr *vap = v->a_vap; 1068 1069 MPASS(vap->va_type == VDIR); 1070 1071 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1072 } 1073 1074 /* --------------------------------------------------------------------- */ 1075 1076 static int 1077 tmpfs_rmdir(struct vop_rmdir_args *v) 1078 { 1079 struct vnode *dvp = v->a_dvp; 1080 struct vnode *vp = v->a_vp; 1081 1082 int error; 1083 struct tmpfs_dirent *de; 1084 struct tmpfs_mount *tmp; 1085 struct tmpfs_node *dnode; 1086 struct tmpfs_node *node; 1087 1088 MPASS(VOP_ISLOCKED(dvp)); 1089 MPASS(VOP_ISLOCKED(vp)); 1090 1091 tmp = VFS_TO_TMPFS(dvp->v_mount); 1092 dnode = VP_TO_TMPFS_DIR(dvp); 1093 node = VP_TO_TMPFS_DIR(vp); 1094 1095 /* Directories with more than two entries ('.' and '..') cannot be 1096 * removed. */ 1097 if (node->tn_size > 0) { 1098 error = ENOTEMPTY; 1099 goto out; 1100 } 1101 1102 if ((dnode->tn_flags & APPEND) 1103 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1104 error = EPERM; 1105 goto out; 1106 } 1107 1108 /* This invariant holds only if we are not trying to remove "..". 1109 * We checked for that above so this is safe now. */ 1110 MPASS(node->tn_dir.tn_parent == dnode); 1111 1112 /* Get the directory entry associated with node (vp). This was 1113 * filled by tmpfs_lookup while looking up the entry. */ 1114 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1115 MPASS(TMPFS_DIRENT_MATCHES(de, 1116 v->a_cnp->cn_nameptr, 1117 v->a_cnp->cn_namelen)); 1118 1119 /* Check flags to see if we are allowed to remove the directory. */ 1120 if (dnode->tn_flags & APPEND 1121 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1122 error = EPERM; 1123 goto out; 1124 } 1125 1126 1127 /* Detach the directory entry from the directory (dnode). */ 1128 tmpfs_dir_detach(dvp, de); 1129 if (v->a_cnp->cn_flags & DOWHITEOUT) 1130 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1131 1132 /* No vnode should be allocated for this entry from this point */ 1133 TMPFS_NODE_LOCK(node); 1134 TMPFS_ASSERT_ELOCKED(node); 1135 node->tn_links--; 1136 node->tn_dir.tn_parent = NULL; 1137 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1138 TMPFS_NODE_MODIFIED; 1139 1140 TMPFS_NODE_UNLOCK(node); 1141 1142 TMPFS_NODE_LOCK(dnode); 1143 TMPFS_ASSERT_ELOCKED(dnode); 1144 dnode->tn_links--; 1145 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1146 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1147 TMPFS_NODE_UNLOCK(dnode); 1148 1149 cache_purge(dvp); 1150 cache_purge(vp); 1151 1152 /* Free the directory entry we just deleted. Note that the node 1153 * referred by it will not be removed until the vnode is really 1154 * reclaimed. */ 1155 tmpfs_free_dirent(tmp, de); 1156 1157 /* Release the deleted vnode (will destroy the node, notify 1158 * interested parties and clean it from the cache). */ 1159 1160 dnode->tn_status |= TMPFS_NODE_CHANGED; 1161 tmpfs_update(dvp); 1162 1163 error = 0; 1164 1165 out: 1166 return error; 1167 } 1168 1169 /* --------------------------------------------------------------------- */ 1170 1171 static int 1172 tmpfs_symlink(struct vop_symlink_args *v) 1173 { 1174 struct vnode *dvp = v->a_dvp; 1175 struct vnode **vpp = v->a_vpp; 1176 struct componentname *cnp = v->a_cnp; 1177 struct vattr *vap = v->a_vap; 1178 char *target = v->a_target; 1179 1180 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1181 MPASS(vap->va_type == VLNK); 1182 #else 1183 vap->va_type = VLNK; 1184 #endif 1185 1186 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1187 } 1188 1189 /* --------------------------------------------------------------------- */ 1190 1191 static int 1192 tmpfs_readdir(struct vop_readdir_args *v) 1193 { 1194 struct vnode *vp = v->a_vp; 1195 struct uio *uio = v->a_uio; 1196 int *eofflag = v->a_eofflag; 1197 u_long **cookies = v->a_cookies; 1198 int *ncookies = v->a_ncookies; 1199 1200 int error; 1201 ssize_t startresid; 1202 int cnt = 0; 1203 struct tmpfs_node *node; 1204 1205 /* This operation only makes sense on directory nodes. */ 1206 if (vp->v_type != VDIR) 1207 return ENOTDIR; 1208 1209 node = VP_TO_TMPFS_DIR(vp); 1210 1211 startresid = uio->uio_resid; 1212 1213 if (cookies != NULL && ncookies != NULL) { 1214 cnt = howmany(node->tn_size, sizeof(struct tmpfs_dirent)) + 2; 1215 *cookies = malloc(cnt * sizeof(**cookies), M_TEMP, M_WAITOK); 1216 *ncookies = 0; 1217 } 1218 1219 if (cnt == 0) 1220 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1221 else 1222 error = tmpfs_dir_getdents(node, uio, cnt, *cookies, ncookies); 1223 1224 if (error == EJUSTRETURN) 1225 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1226 1227 if (error != 0 && cnt != 0) 1228 free(*cookies, M_TEMP); 1229 1230 if (eofflag != NULL) 1231 *eofflag = 1232 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1233 1234 return error; 1235 } 1236 1237 /* --------------------------------------------------------------------- */ 1238 1239 static int 1240 tmpfs_readlink(struct vop_readlink_args *v) 1241 { 1242 struct vnode *vp = v->a_vp; 1243 struct uio *uio = v->a_uio; 1244 1245 int error; 1246 struct tmpfs_node *node; 1247 1248 MPASS(uio->uio_offset == 0); 1249 MPASS(vp->v_type == VLNK); 1250 1251 node = VP_TO_TMPFS_NODE(vp); 1252 1253 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1254 uio); 1255 node->tn_status |= TMPFS_NODE_ACCESSED; 1256 1257 return error; 1258 } 1259 1260 /* --------------------------------------------------------------------- */ 1261 1262 static int 1263 tmpfs_inactive(struct vop_inactive_args *v) 1264 { 1265 struct vnode *vp = v->a_vp; 1266 1267 struct tmpfs_node *node; 1268 1269 node = VP_TO_TMPFS_NODE(vp); 1270 1271 if (node->tn_links == 0) 1272 vrecycle(vp); 1273 1274 return 0; 1275 } 1276 1277 /* --------------------------------------------------------------------- */ 1278 1279 int 1280 tmpfs_reclaim(struct vop_reclaim_args *v) 1281 { 1282 struct vnode *vp = v->a_vp; 1283 1284 struct tmpfs_mount *tmp; 1285 struct tmpfs_node *node; 1286 1287 node = VP_TO_TMPFS_NODE(vp); 1288 tmp = VFS_TO_TMPFS(vp->v_mount); 1289 1290 if (vp->v_type == VREG) 1291 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1292 else 1293 vnode_destroy_vobject(vp); 1294 vp->v_object = NULL; 1295 cache_purge(vp); 1296 1297 TMPFS_NODE_LOCK(node); 1298 TMPFS_ASSERT_ELOCKED(node); 1299 tmpfs_free_vp(vp); 1300 1301 /* If the node referenced by this vnode was deleted by the user, 1302 * we must free its associated data structures (now that the vnode 1303 * is being reclaimed). */ 1304 if (node->tn_links == 0 && 1305 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1306 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1307 TMPFS_NODE_UNLOCK(node); 1308 tmpfs_free_node(tmp, node); 1309 } else 1310 TMPFS_NODE_UNLOCK(node); 1311 1312 MPASS(vp->v_data == NULL); 1313 return 0; 1314 } 1315 1316 /* --------------------------------------------------------------------- */ 1317 1318 static int 1319 tmpfs_print(struct vop_print_args *v) 1320 { 1321 struct vnode *vp = v->a_vp; 1322 1323 struct tmpfs_node *node; 1324 1325 node = VP_TO_TMPFS_NODE(vp); 1326 1327 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n", 1328 node, node->tn_flags, node->tn_links); 1329 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1330 node->tn_mode, node->tn_uid, node->tn_gid, 1331 (intmax_t)node->tn_size, node->tn_status); 1332 1333 if (vp->v_type == VFIFO) 1334 fifo_printinfo(vp); 1335 1336 printf("\n"); 1337 1338 return 0; 1339 } 1340 1341 /* --------------------------------------------------------------------- */ 1342 1343 static int 1344 tmpfs_pathconf(struct vop_pathconf_args *v) 1345 { 1346 int name = v->a_name; 1347 register_t *retval = v->a_retval; 1348 1349 int error; 1350 1351 error = 0; 1352 1353 switch (name) { 1354 case _PC_LINK_MAX: 1355 *retval = LINK_MAX; 1356 break; 1357 1358 case _PC_NAME_MAX: 1359 *retval = NAME_MAX; 1360 break; 1361 1362 case _PC_PATH_MAX: 1363 *retval = PATH_MAX; 1364 break; 1365 1366 case _PC_PIPE_BUF: 1367 *retval = PIPE_BUF; 1368 break; 1369 1370 case _PC_CHOWN_RESTRICTED: 1371 *retval = 1; 1372 break; 1373 1374 case _PC_NO_TRUNC: 1375 *retval = 1; 1376 break; 1377 1378 case _PC_SYNC_IO: 1379 *retval = 1; 1380 break; 1381 1382 case _PC_FILESIZEBITS: 1383 *retval = 0; /* XXX Don't know which value should I return. */ 1384 break; 1385 1386 default: 1387 error = EINVAL; 1388 } 1389 1390 return error; 1391 } 1392 1393 static int 1394 tmpfs_vptofh(struct vop_vptofh_args *ap) 1395 { 1396 struct tmpfs_fid *tfhp; 1397 struct tmpfs_node *node; 1398 1399 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1400 node = VP_TO_TMPFS_NODE(ap->a_vp); 1401 1402 tfhp->tf_len = sizeof(struct tmpfs_fid); 1403 tfhp->tf_id = node->tn_id; 1404 tfhp->tf_gen = node->tn_gen; 1405 1406 return (0); 1407 } 1408 1409 static int 1410 tmpfs_whiteout(struct vop_whiteout_args *ap) 1411 { 1412 struct vnode *dvp = ap->a_dvp; 1413 struct componentname *cnp = ap->a_cnp; 1414 struct tmpfs_dirent *de; 1415 1416 switch (ap->a_flags) { 1417 case LOOKUP: 1418 return (0); 1419 case CREATE: 1420 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1421 if (de != NULL) 1422 return (de->td_node == NULL ? 0 : EEXIST); 1423 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1424 case DELETE: 1425 tmpfs_dir_whiteout_remove(dvp, cnp); 1426 return (0); 1427 default: 1428 panic("tmpfs_whiteout: unknown op"); 1429 } 1430 } 1431 1432 /* --------------------------------------------------------------------- */ 1433 1434 /* 1435 * vnode operations vector used for files stored in a tmpfs file system. 1436 */ 1437 struct vop_vector tmpfs_vnodeop_entries = { 1438 .vop_default = &default_vnodeops, 1439 .vop_lookup = vfs_cache_lookup, 1440 .vop_cachedlookup = tmpfs_lookup, 1441 .vop_create = tmpfs_create, 1442 .vop_mknod = tmpfs_mknod, 1443 .vop_open = tmpfs_open, 1444 .vop_close = tmpfs_close, 1445 .vop_access = tmpfs_access, 1446 .vop_getattr = tmpfs_getattr, 1447 .vop_setattr = tmpfs_setattr, 1448 .vop_read = tmpfs_read, 1449 .vop_write = tmpfs_write, 1450 .vop_fsync = tmpfs_fsync, 1451 .vop_remove = tmpfs_remove, 1452 .vop_link = tmpfs_link, 1453 .vop_rename = tmpfs_rename, 1454 .vop_mkdir = tmpfs_mkdir, 1455 .vop_rmdir = tmpfs_rmdir, 1456 .vop_symlink = tmpfs_symlink, 1457 .vop_readdir = tmpfs_readdir, 1458 .vop_readlink = tmpfs_readlink, 1459 .vop_inactive = tmpfs_inactive, 1460 .vop_reclaim = tmpfs_reclaim, 1461 .vop_print = tmpfs_print, 1462 .vop_pathconf = tmpfs_pathconf, 1463 .vop_vptofh = tmpfs_vptofh, 1464 .vop_whiteout = tmpfs_whiteout, 1465 .vop_bmap = VOP_EOPNOTSUPP, 1466 }; 1467
Cache object: 76b6e93d2b855edfd73e53394b2d256b
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