Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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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("$FreeBSD$"); 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/stat.h> 49 #include <sys/sysctl.h> 50 #include <sys/unistd.h> 51 #include <sys/vnode.h> 52 53 #include <vm/vm.h> 54 #include <vm/vm_param.h> 55 #include <vm/vm_object.h> 56 57 #include <fs/tmpfs/tmpfs_vnops.h> 58 #include <fs/tmpfs/tmpfs.h> 59 60 SYSCTL_DECL(_vfs_tmpfs); 61 62 static volatile int tmpfs_rename_restarts; 63 SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD, 64 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0, 65 "Times rename had to restart due to lock contention"); 66 67 static int 68 tmpfs_vn_get_ino_alloc(struct mount *mp, void *arg, int lkflags, 69 struct vnode **rvp) 70 { 71 72 return (tmpfs_alloc_vp(mp, arg, lkflags, rvp)); 73 } 74 75 static int 76 tmpfs_lookup1(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp) 77 { 78 struct tmpfs_dirent *de; 79 struct tmpfs_node *dnode, *pnode; 80 struct tmpfs_mount *tm; 81 int error; 82 83 dnode = VP_TO_TMPFS_DIR(dvp); 84 *vpp = NULLVP; 85 86 /* Check accessibility of requested node as a first step. */ 87 error = vn_dir_check_exec(dvp, cnp); 88 if (error != 0) 89 goto out; 90 91 /* We cannot be requesting the parent directory of the root node. */ 92 MPASS(IMPLIES(dnode->tn_type == VDIR && 93 dnode->tn_dir.tn_parent == dnode, 94 !(cnp->cn_flags & ISDOTDOT))); 95 96 TMPFS_ASSERT_LOCKED(dnode); 97 if (dnode->tn_dir.tn_parent == NULL) { 98 error = ENOENT; 99 goto out; 100 } 101 if (cnp->cn_flags & ISDOTDOT) { 102 tm = VFS_TO_TMPFS(dvp->v_mount); 103 pnode = dnode->tn_dir.tn_parent; 104 tmpfs_ref_node(pnode); 105 error = vn_vget_ino_gen(dvp, tmpfs_vn_get_ino_alloc, 106 pnode, cnp->cn_lkflags, vpp); 107 tmpfs_free_node(tm, pnode); 108 if (error != 0) 109 goto out; 110 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 111 VREF(dvp); 112 *vpp = dvp; 113 error = 0; 114 } else { 115 de = tmpfs_dir_lookup(dnode, NULL, cnp); 116 if (de != NULL && de->td_node == NULL) 117 cnp->cn_flags |= ISWHITEOUT; 118 if (de == NULL || de->td_node == NULL) { 119 /* 120 * The entry was not found in the directory. 121 * This is OK if we are creating or renaming an 122 * entry and are working on the last component of 123 * the path name. 124 */ 125 if ((cnp->cn_flags & ISLASTCN) && 126 (cnp->cn_nameiop == CREATE || \ 127 cnp->cn_nameiop == RENAME || 128 (cnp->cn_nameiop == DELETE && 129 cnp->cn_flags & DOWHITEOUT && 130 cnp->cn_flags & ISWHITEOUT))) { 131 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 132 cnp->cn_thread); 133 if (error != 0) 134 goto out; 135 136 /* 137 * Keep the component name in the buffer for 138 * future uses. 139 */ 140 cnp->cn_flags |= SAVENAME; 141 142 error = EJUSTRETURN; 143 } else 144 error = ENOENT; 145 } else { 146 struct tmpfs_node *tnode; 147 148 /* 149 * The entry was found, so get its associated 150 * tmpfs_node. 151 */ 152 tnode = de->td_node; 153 154 /* 155 * If we are not at the last path component and 156 * found a non-directory or non-link entry (which 157 * may itself be pointing to a directory), raise 158 * an error. 159 */ 160 if ((tnode->tn_type != VDIR && 161 tnode->tn_type != VLNK) && 162 !(cnp->cn_flags & ISLASTCN)) { 163 error = ENOTDIR; 164 goto out; 165 } 166 167 /* 168 * If we are deleting or renaming the entry, keep 169 * track of its tmpfs_dirent so that it can be 170 * easily deleted later. 171 */ 172 if ((cnp->cn_flags & ISLASTCN) && 173 (cnp->cn_nameiop == DELETE || 174 cnp->cn_nameiop == RENAME)) { 175 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 176 cnp->cn_thread); 177 if (error != 0) 178 goto out; 179 180 /* Allocate a new vnode on the matching entry. */ 181 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 182 cnp->cn_lkflags, vpp); 183 if (error != 0) 184 goto out; 185 186 if ((dnode->tn_mode & S_ISTXT) && 187 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, 188 cnp->cn_thread) && VOP_ACCESS(*vpp, VADMIN, 189 cnp->cn_cred, cnp->cn_thread)) { 190 error = EPERM; 191 vput(*vpp); 192 *vpp = NULL; 193 goto out; 194 } 195 cnp->cn_flags |= SAVENAME; 196 } else { 197 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 198 cnp->cn_lkflags, vpp); 199 if (error != 0) 200 goto out; 201 } 202 } 203 } 204 205 /* 206 * Store the result of this lookup in the cache. Avoid this if the 207 * request was for creation, as it does not improve timings on 208 * emprical tests. 209 */ 210 if ((cnp->cn_flags & MAKEENTRY) != 0 && tmpfs_use_nc(dvp)) 211 cache_enter(dvp, *vpp, cnp); 212 213 out: 214 /* 215 * If there were no errors, *vpp cannot be null and it must be 216 * locked. 217 */ 218 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 219 220 return (error); 221 } 222 223 static int 224 tmpfs_cached_lookup(struct vop_cachedlookup_args *v) 225 { 226 227 return (tmpfs_lookup1(v->a_dvp, v->a_vpp, v->a_cnp)); 228 } 229 230 static int 231 tmpfs_lookup(struct vop_lookup_args *v) 232 { 233 234 return (tmpfs_lookup1(v->a_dvp, v->a_vpp, v->a_cnp)); 235 } 236 237 static int 238 tmpfs_create(struct vop_create_args *v) 239 { 240 struct vnode *dvp = v->a_dvp; 241 struct vnode **vpp = v->a_vpp; 242 struct componentname *cnp = v->a_cnp; 243 struct vattr *vap = v->a_vap; 244 int error; 245 246 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 247 248 error = tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 249 if (error == 0 && (cnp->cn_flags & MAKEENTRY) != 0 && tmpfs_use_nc(dvp)) 250 cache_enter(dvp, *vpp, cnp); 251 return (error); 252 } 253 254 static int 255 tmpfs_mknod(struct vop_mknod_args *v) 256 { 257 struct vnode *dvp = v->a_dvp; 258 struct vnode **vpp = v->a_vpp; 259 struct componentname *cnp = v->a_cnp; 260 struct vattr *vap = v->a_vap; 261 262 if (vap->va_type != VBLK && vap->va_type != VCHR && 263 vap->va_type != VFIFO) 264 return EINVAL; 265 266 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 267 } 268 269 static int 270 tmpfs_open(struct vop_open_args *v) 271 { 272 struct vnode *vp = v->a_vp; 273 int mode = v->a_mode; 274 275 int error; 276 struct tmpfs_node *node; 277 278 MPASS(VOP_ISLOCKED(vp)); 279 280 node = VP_TO_TMPFS_NODE(vp); 281 282 /* The file is still active but all its names have been removed 283 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 284 * it is about to die. */ 285 if (node->tn_links < 1) 286 return (ENOENT); 287 288 /* If the file is marked append-only, deny write requests. */ 289 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 290 error = EPERM; 291 else { 292 error = 0; 293 /* For regular files, the call below is nop. */ 294 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags & 295 OBJ_DEAD) == 0, ("dead object")); 296 vnode_create_vobject(vp, node->tn_size, v->a_td); 297 } 298 299 MPASS(VOP_ISLOCKED(vp)); 300 return error; 301 } 302 303 static int 304 tmpfs_close(struct vop_close_args *v) 305 { 306 struct vnode *vp = v->a_vp; 307 308 /* Update node times. */ 309 tmpfs_update(vp); 310 311 return (0); 312 } 313 314 int 315 tmpfs_access(struct vop_access_args *v) 316 { 317 struct vnode *vp = v->a_vp; 318 accmode_t accmode = v->a_accmode; 319 struct ucred *cred = v->a_cred; 320 321 int error; 322 struct tmpfs_node *node; 323 324 MPASS(VOP_ISLOCKED(vp)); 325 326 node = VP_TO_TMPFS_NODE(vp); 327 328 switch (vp->v_type) { 329 case VDIR: 330 /* FALLTHROUGH */ 331 case VLNK: 332 /* FALLTHROUGH */ 333 case VREG: 334 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 335 error = EROFS; 336 goto out; 337 } 338 break; 339 340 case VBLK: 341 /* FALLTHROUGH */ 342 case VCHR: 343 /* FALLTHROUGH */ 344 case VSOCK: 345 /* FALLTHROUGH */ 346 case VFIFO: 347 break; 348 349 default: 350 error = EINVAL; 351 goto out; 352 } 353 354 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 355 error = EPERM; 356 goto out; 357 } 358 359 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 360 node->tn_gid, accmode, cred, NULL); 361 362 out: 363 MPASS(VOP_ISLOCKED(vp)); 364 365 return error; 366 } 367 368 int 369 tmpfs_getattr(struct vop_getattr_args *v) 370 { 371 struct vnode *vp = v->a_vp; 372 struct vattr *vap = v->a_vap; 373 vm_object_t obj; 374 struct tmpfs_node *node; 375 376 node = VP_TO_TMPFS_NODE(vp); 377 378 tmpfs_update(vp); 379 380 vap->va_type = vp->v_type; 381 vap->va_mode = node->tn_mode; 382 vap->va_nlink = node->tn_links; 383 vap->va_uid = node->tn_uid; 384 vap->va_gid = node->tn_gid; 385 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 386 vap->va_fileid = node->tn_id; 387 vap->va_size = node->tn_size; 388 vap->va_blocksize = PAGE_SIZE; 389 vap->va_atime = node->tn_atime; 390 vap->va_mtime = node->tn_mtime; 391 vap->va_ctime = node->tn_ctime; 392 vap->va_birthtime = node->tn_birthtime; 393 vap->va_gen = node->tn_gen; 394 vap->va_flags = node->tn_flags; 395 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 396 node->tn_rdev : NODEV; 397 if (vp->v_type == VREG) { 398 obj = node->tn_reg.tn_aobj; 399 vap->va_bytes = (u_quad_t)obj->resident_page_count * PAGE_SIZE; 400 } else 401 vap->va_bytes = node->tn_size; 402 vap->va_filerev = 0; 403 404 return 0; 405 } 406 407 int 408 tmpfs_setattr(struct vop_setattr_args *v) 409 { 410 struct vnode *vp = v->a_vp; 411 struct vattr *vap = v->a_vap; 412 struct ucred *cred = v->a_cred; 413 struct thread *td = curthread; 414 415 int error; 416 417 MPASS(VOP_ISLOCKED(vp)); 418 419 error = 0; 420 421 /* Abort if any unsettable attribute is given. */ 422 if (vap->va_type != VNON || 423 vap->va_nlink != VNOVAL || 424 vap->va_fsid != VNOVAL || 425 vap->va_fileid != VNOVAL || 426 vap->va_blocksize != VNOVAL || 427 vap->va_gen != VNOVAL || 428 vap->va_rdev != VNOVAL || 429 vap->va_bytes != VNOVAL) 430 error = EINVAL; 431 432 if (error == 0 && (vap->va_flags != VNOVAL)) 433 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 434 435 if (error == 0 && (vap->va_size != VNOVAL)) 436 error = tmpfs_chsize(vp, vap->va_size, cred, td); 437 438 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 439 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 440 441 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 442 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 443 444 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 445 vap->va_atime.tv_nsec != VNOVAL) || 446 (vap->va_mtime.tv_sec != VNOVAL && 447 vap->va_mtime.tv_nsec != VNOVAL) || 448 (vap->va_birthtime.tv_sec != VNOVAL && 449 vap->va_birthtime.tv_nsec != VNOVAL))) 450 error = tmpfs_chtimes(vp, vap, cred, td); 451 452 /* Update the node times. We give preference to the error codes 453 * generated by this function rather than the ones that may arise 454 * from tmpfs_update. */ 455 tmpfs_update(vp); 456 457 MPASS(VOP_ISLOCKED(vp)); 458 459 return error; 460 } 461 462 static int 463 tmpfs_read(struct vop_read_args *v) 464 { 465 struct vnode *vp; 466 struct uio *uio; 467 struct tmpfs_node *node; 468 469 vp = v->a_vp; 470 if (vp->v_type != VREG) 471 return (EISDIR); 472 uio = v->a_uio; 473 if (uio->uio_offset < 0) 474 return (EINVAL); 475 node = VP_TO_TMPFS_NODE(vp); 476 tmpfs_set_status(VFS_TO_TMPFS(vp->v_mount), node, TMPFS_NODE_ACCESSED); 477 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio)); 478 } 479 480 static int 481 tmpfs_write(struct vop_write_args *v) 482 { 483 struct vnode *vp; 484 struct uio *uio; 485 struct tmpfs_node *node; 486 off_t oldsize; 487 int error, ioflag; 488 489 vp = v->a_vp; 490 uio = v->a_uio; 491 ioflag = v->a_ioflag; 492 error = 0; 493 node = VP_TO_TMPFS_NODE(vp); 494 oldsize = node->tn_size; 495 496 if (uio->uio_offset < 0 || vp->v_type != VREG) 497 return (EINVAL); 498 if (uio->uio_resid == 0) 499 return (0); 500 if (ioflag & IO_APPEND) 501 uio->uio_offset = node->tn_size; 502 if (uio->uio_offset + uio->uio_resid > 503 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 504 return (EFBIG); 505 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 506 return (EFBIG); 507 if (uio->uio_offset + uio->uio_resid > node->tn_size) { 508 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 509 FALSE); 510 if (error != 0) 511 goto out; 512 } 513 514 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio); 515 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 516 TMPFS_NODE_CHANGED; 517 if (node->tn_mode & (S_ISUID | S_ISGID)) { 518 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 519 node->tn_mode &= ~(S_ISUID | S_ISGID); 520 } 521 if (error != 0) 522 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 523 524 out: 525 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 526 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 527 528 return (error); 529 } 530 531 static int 532 tmpfs_fsync(struct vop_fsync_args *v) 533 { 534 struct vnode *vp = v->a_vp; 535 536 MPASS(VOP_ISLOCKED(vp)); 537 538 tmpfs_check_mtime(vp); 539 tmpfs_update(vp); 540 541 return 0; 542 } 543 544 static int 545 tmpfs_remove(struct vop_remove_args *v) 546 { 547 struct vnode *dvp = v->a_dvp; 548 struct vnode *vp = v->a_vp; 549 550 int error; 551 struct tmpfs_dirent *de; 552 struct tmpfs_mount *tmp; 553 struct tmpfs_node *dnode; 554 struct tmpfs_node *node; 555 556 MPASS(VOP_ISLOCKED(dvp)); 557 MPASS(VOP_ISLOCKED(vp)); 558 559 if (vp->v_type == VDIR) { 560 error = EISDIR; 561 goto out; 562 } 563 564 dnode = VP_TO_TMPFS_DIR(dvp); 565 node = VP_TO_TMPFS_NODE(vp); 566 tmp = VFS_TO_TMPFS(vp->v_mount); 567 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 568 MPASS(de != NULL); 569 570 /* Files marked as immutable or append-only cannot be deleted. */ 571 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 572 (dnode->tn_flags & APPEND)) { 573 error = EPERM; 574 goto out; 575 } 576 577 /* Remove the entry from the directory; as it is a file, we do not 578 * have to change the number of hard links of the directory. */ 579 tmpfs_dir_detach(dvp, de); 580 if (v->a_cnp->cn_flags & DOWHITEOUT) 581 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 582 583 /* Free the directory entry we just deleted. Note that the node 584 * referred by it will not be removed until the vnode is really 585 * reclaimed. */ 586 tmpfs_free_dirent(tmp, de); 587 588 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 589 error = 0; 590 591 out: 592 593 return error; 594 } 595 596 static int 597 tmpfs_link(struct vop_link_args *v) 598 { 599 struct vnode *dvp = v->a_tdvp; 600 struct vnode *vp = v->a_vp; 601 struct componentname *cnp = v->a_cnp; 602 603 int error; 604 struct tmpfs_dirent *de; 605 struct tmpfs_node *node; 606 607 MPASS(VOP_ISLOCKED(dvp)); 608 MPASS(cnp->cn_flags & HASBUF); 609 MPASS(dvp != vp); /* XXX When can this be false? */ 610 node = VP_TO_TMPFS_NODE(vp); 611 612 /* Ensure that we do not overflow the maximum number of links imposed 613 * by the system. */ 614 MPASS(node->tn_links <= LINK_MAX); 615 if (node->tn_links == LINK_MAX) { 616 error = EMLINK; 617 goto out; 618 } 619 620 /* We cannot create links of files marked immutable or append-only. */ 621 if (node->tn_flags & (IMMUTABLE | APPEND)) { 622 error = EPERM; 623 goto out; 624 } 625 626 /* Allocate a new directory entry to represent the node. */ 627 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 628 cnp->cn_nameptr, cnp->cn_namelen, &de); 629 if (error != 0) 630 goto out; 631 632 /* Insert the new directory entry into the appropriate directory. */ 633 if (cnp->cn_flags & ISWHITEOUT) 634 tmpfs_dir_whiteout_remove(dvp, cnp); 635 tmpfs_dir_attach(dvp, de); 636 637 /* vp link count has changed, so update node times. */ 638 node->tn_status |= TMPFS_NODE_CHANGED; 639 tmpfs_update(vp); 640 641 error = 0; 642 643 out: 644 return error; 645 } 646 647 /* 648 * We acquire all but fdvp locks using non-blocking acquisitions. If we 649 * fail to acquire any lock in the path we will drop all held locks, 650 * acquire the new lock in a blocking fashion, and then release it and 651 * restart the rename. This acquire/release step ensures that we do not 652 * spin on a lock waiting for release. On error release all vnode locks 653 * and decrement references the way tmpfs_rename() would do. 654 */ 655 static int 656 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 657 struct vnode *tdvp, struct vnode **tvpp, 658 struct componentname *fcnp, struct componentname *tcnp) 659 { 660 struct vnode *nvp; 661 struct mount *mp; 662 struct tmpfs_dirent *de; 663 int error, restarts = 0; 664 665 VOP_UNLOCK(tdvp, 0); 666 if (*tvpp != NULL && *tvpp != tdvp) 667 VOP_UNLOCK(*tvpp, 0); 668 mp = fdvp->v_mount; 669 670 relock: 671 restarts += 1; 672 error = vn_lock(fdvp, LK_EXCLUSIVE); 673 if (error) 674 goto releout; 675 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 676 VOP_UNLOCK(fdvp, 0); 677 error = vn_lock(tdvp, LK_EXCLUSIVE); 678 if (error) 679 goto releout; 680 VOP_UNLOCK(tdvp, 0); 681 goto relock; 682 } 683 /* 684 * Re-resolve fvp to be certain it still exists and fetch the 685 * correct vnode. 686 */ 687 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 688 if (de == NULL) { 689 VOP_UNLOCK(fdvp, 0); 690 VOP_UNLOCK(tdvp, 0); 691 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 692 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 693 error = EINVAL; 694 else 695 error = ENOENT; 696 goto releout; 697 } 698 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 699 if (error != 0) { 700 VOP_UNLOCK(fdvp, 0); 701 VOP_UNLOCK(tdvp, 0); 702 if (error != EBUSY) 703 goto releout; 704 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 705 if (error != 0) 706 goto releout; 707 VOP_UNLOCK(nvp, 0); 708 /* 709 * Concurrent rename race. 710 */ 711 if (nvp == tdvp) { 712 vrele(nvp); 713 error = EINVAL; 714 goto releout; 715 } 716 vrele(*fvpp); 717 *fvpp = nvp; 718 goto relock; 719 } 720 vrele(*fvpp); 721 *fvpp = nvp; 722 VOP_UNLOCK(*fvpp, 0); 723 /* 724 * Re-resolve tvp and acquire the vnode lock if present. 725 */ 726 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 727 /* 728 * If tvp disappeared we just carry on. 729 */ 730 if (de == NULL && *tvpp != NULL) { 731 vrele(*tvpp); 732 *tvpp = NULL; 733 } 734 /* 735 * Get the tvp ino if the lookup succeeded. We may have to restart 736 * if the non-blocking acquire fails. 737 */ 738 if (de != NULL) { 739 nvp = NULL; 740 error = tmpfs_alloc_vp(mp, de->td_node, 741 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 742 if (*tvpp != NULL) 743 vrele(*tvpp); 744 *tvpp = nvp; 745 if (error != 0) { 746 VOP_UNLOCK(fdvp, 0); 747 VOP_UNLOCK(tdvp, 0); 748 if (error != EBUSY) 749 goto releout; 750 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 751 &nvp); 752 if (error != 0) 753 goto releout; 754 VOP_UNLOCK(nvp, 0); 755 /* 756 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 757 */ 758 if (nvp == fdvp) { 759 error = ENOTEMPTY; 760 goto releout; 761 } 762 goto relock; 763 } 764 } 765 tmpfs_rename_restarts += restarts; 766 767 return (0); 768 769 releout: 770 vrele(fdvp); 771 vrele(*fvpp); 772 vrele(tdvp); 773 if (*tvpp != NULL) 774 vrele(*tvpp); 775 tmpfs_rename_restarts += restarts; 776 777 return (error); 778 } 779 780 static int 781 tmpfs_rename(struct vop_rename_args *v) 782 { 783 struct vnode *fdvp = v->a_fdvp; 784 struct vnode *fvp = v->a_fvp; 785 struct componentname *fcnp = v->a_fcnp; 786 struct vnode *tdvp = v->a_tdvp; 787 struct vnode *tvp = v->a_tvp; 788 struct componentname *tcnp = v->a_tcnp; 789 char *newname; 790 struct tmpfs_dirent *de; 791 struct tmpfs_mount *tmp; 792 struct tmpfs_node *fdnode; 793 struct tmpfs_node *fnode; 794 struct tmpfs_node *tnode; 795 struct tmpfs_node *tdnode; 796 int error; 797 798 MPASS(VOP_ISLOCKED(tdvp)); 799 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 800 MPASS(fcnp->cn_flags & HASBUF); 801 MPASS(tcnp->cn_flags & HASBUF); 802 803 /* 804 * Disallow cross-device renames. 805 * XXX Why isn't this done by the caller? 806 */ 807 if (fvp->v_mount != tdvp->v_mount || 808 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 809 error = EXDEV; 810 goto out; 811 } 812 813 /* If source and target are the same file, there is nothing to do. */ 814 if (fvp == tvp) { 815 error = 0; 816 goto out; 817 } 818 819 /* 820 * If we need to move the directory between entries, lock the 821 * source so that we can safely operate on it. 822 */ 823 if (fdvp != tdvp && fdvp != tvp) { 824 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 825 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 826 fcnp, tcnp); 827 if (error != 0) 828 return (error); 829 ASSERT_VOP_ELOCKED(fdvp, 830 "tmpfs_rename: fdvp not locked"); 831 ASSERT_VOP_ELOCKED(tdvp, 832 "tmpfs_rename: tdvp not locked"); 833 if (tvp != NULL) 834 ASSERT_VOP_ELOCKED(tvp, 835 "tmpfs_rename: tvp not locked"); 836 if (fvp == tvp) { 837 error = 0; 838 goto out_locked; 839 } 840 } 841 } 842 843 tmp = VFS_TO_TMPFS(tdvp->v_mount); 844 tdnode = VP_TO_TMPFS_DIR(tdvp); 845 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 846 fdnode = VP_TO_TMPFS_DIR(fdvp); 847 fnode = VP_TO_TMPFS_NODE(fvp); 848 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 849 850 /* 851 * Entry can disappear before we lock fdvp, 852 * also avoid manipulating '.' and '..' entries. 853 */ 854 if (de == NULL) { 855 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 856 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 857 error = EINVAL; 858 else 859 error = ENOENT; 860 goto out_locked; 861 } 862 MPASS(de->td_node == fnode); 863 864 /* 865 * If re-naming a directory to another preexisting directory 866 * ensure that the target directory is empty so that its 867 * removal causes no side effects. 868 * Kern_rename guarantees the destination to be a directory 869 * if the source is one. 870 */ 871 if (tvp != NULL) { 872 MPASS(tnode != NULL); 873 874 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 875 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 876 error = EPERM; 877 goto out_locked; 878 } 879 880 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 881 if (tnode->tn_size > 0) { 882 error = ENOTEMPTY; 883 goto out_locked; 884 } 885 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 886 error = ENOTDIR; 887 goto out_locked; 888 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 889 error = EISDIR; 890 goto out_locked; 891 } else { 892 MPASS(fnode->tn_type != VDIR && 893 tnode->tn_type != VDIR); 894 } 895 } 896 897 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 898 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 899 error = EPERM; 900 goto out_locked; 901 } 902 903 /* 904 * Ensure that we have enough memory to hold the new name, if it 905 * has to be changed. 906 */ 907 if (fcnp->cn_namelen != tcnp->cn_namelen || 908 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 909 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 910 } else 911 newname = NULL; 912 913 /* 914 * If the node is being moved to another directory, we have to do 915 * the move. 916 */ 917 if (fdnode != tdnode) { 918 /* 919 * In case we are moving a directory, we have to adjust its 920 * parent to point to the new parent. 921 */ 922 if (de->td_node->tn_type == VDIR) { 923 struct tmpfs_node *n; 924 925 /* 926 * Ensure the target directory is not a child of the 927 * directory being moved. Otherwise, we'd end up 928 * with stale nodes. 929 */ 930 n = tdnode; 931 /* 932 * TMPFS_LOCK guaranties that no nodes are freed while 933 * traversing the list. Nodes can only be marked as 934 * removed: tn_parent == NULL. 935 */ 936 TMPFS_LOCK(tmp); 937 TMPFS_NODE_LOCK(n); 938 while (n != n->tn_dir.tn_parent) { 939 struct tmpfs_node *parent; 940 941 if (n == fnode) { 942 TMPFS_NODE_UNLOCK(n); 943 TMPFS_UNLOCK(tmp); 944 error = EINVAL; 945 if (newname != NULL) 946 free(newname, M_TMPFSNAME); 947 goto out_locked; 948 } 949 parent = n->tn_dir.tn_parent; 950 TMPFS_NODE_UNLOCK(n); 951 if (parent == NULL) { 952 n = NULL; 953 break; 954 } 955 TMPFS_NODE_LOCK(parent); 956 if (parent->tn_dir.tn_parent == NULL) { 957 TMPFS_NODE_UNLOCK(parent); 958 n = NULL; 959 break; 960 } 961 n = parent; 962 } 963 TMPFS_UNLOCK(tmp); 964 if (n == NULL) { 965 error = EINVAL; 966 if (newname != NULL) 967 free(newname, M_TMPFSNAME); 968 goto out_locked; 969 } 970 TMPFS_NODE_UNLOCK(n); 971 972 /* Adjust the parent pointer. */ 973 TMPFS_VALIDATE_DIR(fnode); 974 TMPFS_NODE_LOCK(de->td_node); 975 de->td_node->tn_dir.tn_parent = tdnode; 976 TMPFS_NODE_UNLOCK(de->td_node); 977 978 /* 979 * As a result of changing the target of the '..' 980 * entry, the link count of the source and target 981 * directories has to be adjusted. 982 */ 983 TMPFS_NODE_LOCK(tdnode); 984 TMPFS_ASSERT_LOCKED(tdnode); 985 tdnode->tn_links++; 986 TMPFS_NODE_UNLOCK(tdnode); 987 988 TMPFS_NODE_LOCK(fdnode); 989 TMPFS_ASSERT_LOCKED(fdnode); 990 fdnode->tn_links--; 991 TMPFS_NODE_UNLOCK(fdnode); 992 } 993 } 994 995 /* 996 * Do the move: just remove the entry from the source directory 997 * and insert it into the target one. 998 */ 999 tmpfs_dir_detach(fdvp, de); 1000 1001 if (fcnp->cn_flags & DOWHITEOUT) 1002 tmpfs_dir_whiteout_add(fdvp, fcnp); 1003 if (tcnp->cn_flags & ISWHITEOUT) 1004 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1005 1006 /* 1007 * If the name has changed, we need to make it effective by changing 1008 * it in the directory entry. 1009 */ 1010 if (newname != NULL) { 1011 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1012 1013 free(de->ud.td_name, M_TMPFSNAME); 1014 de->ud.td_name = newname; 1015 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 1016 1017 fnode->tn_status |= TMPFS_NODE_CHANGED; 1018 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1019 } 1020 1021 /* 1022 * If we are overwriting an entry, we have to remove the old one 1023 * from the target directory. 1024 */ 1025 if (tvp != NULL) { 1026 struct tmpfs_dirent *tde; 1027 1028 /* Remove the old entry from the target directory. */ 1029 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1030 tmpfs_dir_detach(tdvp, tde); 1031 1032 /* 1033 * Free the directory entry we just deleted. Note that the 1034 * node referred by it will not be removed until the vnode is 1035 * really reclaimed. 1036 */ 1037 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1038 } 1039 1040 tmpfs_dir_attach(tdvp, de); 1041 1042 if (tmpfs_use_nc(fvp)) { 1043 cache_purge(fvp); 1044 if (tvp != NULL) 1045 cache_purge(tvp); 1046 cache_purge_negative(tdvp); 1047 } 1048 1049 error = 0; 1050 1051 out_locked: 1052 if (fdvp != tdvp && fdvp != tvp) 1053 VOP_UNLOCK(fdvp, 0); 1054 1055 out: 1056 /* 1057 * Release target nodes. 1058 * XXX: I don't understand when tdvp can be the same as tvp, but 1059 * other code takes care of this... 1060 */ 1061 if (tdvp == tvp) 1062 vrele(tdvp); 1063 else 1064 vput(tdvp); 1065 if (tvp != NULL) 1066 vput(tvp); 1067 1068 /* Release source nodes. */ 1069 vrele(fdvp); 1070 vrele(fvp); 1071 1072 return (error); 1073 } 1074 1075 static int 1076 tmpfs_mkdir(struct vop_mkdir_args *v) 1077 { 1078 struct vnode *dvp = v->a_dvp; 1079 struct vnode **vpp = v->a_vpp; 1080 struct componentname *cnp = v->a_cnp; 1081 struct vattr *vap = v->a_vap; 1082 1083 MPASS(vap->va_type == VDIR); 1084 1085 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1086 } 1087 1088 static int 1089 tmpfs_rmdir(struct vop_rmdir_args *v) 1090 { 1091 struct vnode *dvp = v->a_dvp; 1092 struct vnode *vp = v->a_vp; 1093 1094 int error; 1095 struct tmpfs_dirent *de; 1096 struct tmpfs_mount *tmp; 1097 struct tmpfs_node *dnode; 1098 struct tmpfs_node *node; 1099 1100 MPASS(VOP_ISLOCKED(dvp)); 1101 MPASS(VOP_ISLOCKED(vp)); 1102 1103 tmp = VFS_TO_TMPFS(dvp->v_mount); 1104 dnode = VP_TO_TMPFS_DIR(dvp); 1105 node = VP_TO_TMPFS_DIR(vp); 1106 1107 /* Directories with more than two entries ('.' and '..') cannot be 1108 * removed. */ 1109 if (node->tn_size > 0) { 1110 error = ENOTEMPTY; 1111 goto out; 1112 } 1113 1114 if ((dnode->tn_flags & APPEND) 1115 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1116 error = EPERM; 1117 goto out; 1118 } 1119 1120 /* This invariant holds only if we are not trying to remove "..". 1121 * We checked for that above so this is safe now. */ 1122 MPASS(node->tn_dir.tn_parent == dnode); 1123 1124 /* Get the directory entry associated with node (vp). This was 1125 * filled by tmpfs_lookup while looking up the entry. */ 1126 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1127 MPASS(TMPFS_DIRENT_MATCHES(de, 1128 v->a_cnp->cn_nameptr, 1129 v->a_cnp->cn_namelen)); 1130 1131 /* Check flags to see if we are allowed to remove the directory. */ 1132 if ((dnode->tn_flags & APPEND) != 0 || 1133 (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) != 0) { 1134 error = EPERM; 1135 goto out; 1136 } 1137 1138 1139 /* Detach the directory entry from the directory (dnode). */ 1140 tmpfs_dir_detach(dvp, de); 1141 if (v->a_cnp->cn_flags & DOWHITEOUT) 1142 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1143 1144 /* No vnode should be allocated for this entry from this point */ 1145 TMPFS_NODE_LOCK(node); 1146 node->tn_links--; 1147 node->tn_dir.tn_parent = NULL; 1148 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1149 TMPFS_NODE_MODIFIED; 1150 1151 TMPFS_NODE_UNLOCK(node); 1152 1153 TMPFS_NODE_LOCK(dnode); 1154 dnode->tn_links--; 1155 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1156 TMPFS_NODE_MODIFIED; 1157 TMPFS_NODE_UNLOCK(dnode); 1158 1159 if (tmpfs_use_nc(dvp)) { 1160 cache_purge(dvp); 1161 cache_purge(vp); 1162 } 1163 1164 /* Free the directory entry we just deleted. Note that the node 1165 * referred by it will not be removed until the vnode is really 1166 * reclaimed. */ 1167 tmpfs_free_dirent(tmp, de); 1168 1169 /* Release the deleted vnode (will destroy the node, notify 1170 * interested parties and clean it from the cache). */ 1171 1172 dnode->tn_status |= TMPFS_NODE_CHANGED; 1173 tmpfs_update(dvp); 1174 1175 error = 0; 1176 1177 out: 1178 return error; 1179 } 1180 1181 static int 1182 tmpfs_symlink(struct vop_symlink_args *v) 1183 { 1184 struct vnode *dvp = v->a_dvp; 1185 struct vnode **vpp = v->a_vpp; 1186 struct componentname *cnp = v->a_cnp; 1187 struct vattr *vap = v->a_vap; 1188 char *target = v->a_target; 1189 1190 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1191 MPASS(vap->va_type == VLNK); 1192 #else 1193 vap->va_type = VLNK; 1194 #endif 1195 1196 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1197 } 1198 1199 static int 1200 tmpfs_readdir(struct vop_readdir_args *va) 1201 { 1202 struct vnode *vp; 1203 struct uio *uio; 1204 struct tmpfs_mount *tm; 1205 struct tmpfs_node *node; 1206 u_long **cookies; 1207 int *eofflag, *ncookies; 1208 ssize_t startresid; 1209 int error, maxcookies; 1210 1211 vp = va->a_vp; 1212 uio = va->a_uio; 1213 eofflag = va->a_eofflag; 1214 cookies = va->a_cookies; 1215 ncookies = va->a_ncookies; 1216 1217 /* This operation only makes sense on directory nodes. */ 1218 if (vp->v_type != VDIR) 1219 return ENOTDIR; 1220 1221 maxcookies = 0; 1222 node = VP_TO_TMPFS_DIR(vp); 1223 tm = VFS_TO_TMPFS(vp->v_mount); 1224 1225 startresid = uio->uio_resid; 1226 1227 /* Allocate cookies for NFS and compat modules. */ 1228 if (cookies != NULL && ncookies != NULL) { 1229 maxcookies = howmany(node->tn_size, 1230 sizeof(struct tmpfs_dirent)) + 2; 1231 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1232 M_WAITOK); 1233 *ncookies = 0; 1234 } 1235 1236 if (cookies == NULL) 1237 error = tmpfs_dir_getdents(tm, node, uio, 0, NULL, NULL); 1238 else 1239 error = tmpfs_dir_getdents(tm, node, uio, maxcookies, *cookies, 1240 ncookies); 1241 1242 /* Buffer was filled without hitting EOF. */ 1243 if (error == EJUSTRETURN) 1244 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1245 1246 if (error != 0 && cookies != NULL && ncookies != NULL) { 1247 free(*cookies, M_TEMP); 1248 *cookies = NULL; 1249 *ncookies = 0; 1250 } 1251 1252 if (eofflag != NULL) 1253 *eofflag = 1254 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1255 1256 return error; 1257 } 1258 1259 static int 1260 tmpfs_readlink(struct vop_readlink_args *v) 1261 { 1262 struct vnode *vp = v->a_vp; 1263 struct uio *uio = v->a_uio; 1264 1265 int error; 1266 struct tmpfs_node *node; 1267 1268 MPASS(uio->uio_offset == 0); 1269 MPASS(vp->v_type == VLNK); 1270 1271 node = VP_TO_TMPFS_NODE(vp); 1272 1273 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1274 uio); 1275 tmpfs_set_status(VFS_TO_TMPFS(vp->v_mount), node, TMPFS_NODE_ACCESSED); 1276 1277 return (error); 1278 } 1279 1280 static int 1281 tmpfs_inactive(struct vop_inactive_args *v) 1282 { 1283 struct vnode *vp; 1284 struct tmpfs_node *node; 1285 1286 vp = v->a_vp; 1287 node = VP_TO_TMPFS_NODE(vp); 1288 if (node->tn_links == 0) 1289 vrecycle(vp); 1290 else 1291 tmpfs_check_mtime(vp); 1292 return (0); 1293 } 1294 1295 int 1296 tmpfs_reclaim(struct vop_reclaim_args *v) 1297 { 1298 struct vnode *vp = v->a_vp; 1299 1300 struct tmpfs_mount *tmp; 1301 struct tmpfs_node *node; 1302 1303 node = VP_TO_TMPFS_NODE(vp); 1304 tmp = VFS_TO_TMPFS(vp->v_mount); 1305 1306 if (vp->v_type == VREG) 1307 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1308 else 1309 vnode_destroy_vobject(vp); 1310 vp->v_object = NULL; 1311 if (tmpfs_use_nc(vp)) 1312 cache_purge(vp); 1313 1314 TMPFS_NODE_LOCK(node); 1315 tmpfs_free_vp(vp); 1316 1317 /* If the node referenced by this vnode was deleted by the user, 1318 * we must free its associated data structures (now that the vnode 1319 * is being reclaimed). */ 1320 if (node->tn_links == 0 && 1321 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1322 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1323 TMPFS_NODE_UNLOCK(node); 1324 tmpfs_free_node(tmp, node); 1325 } else 1326 TMPFS_NODE_UNLOCK(node); 1327 1328 MPASS(vp->v_data == NULL); 1329 return 0; 1330 } 1331 1332 int 1333 tmpfs_print(struct vop_print_args *v) 1334 { 1335 struct vnode *vp = v->a_vp; 1336 1337 struct tmpfs_node *node; 1338 1339 node = VP_TO_TMPFS_NODE(vp); 1340 1341 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %jd\n", 1342 node, node->tn_flags, (uintmax_t)node->tn_links); 1343 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1344 node->tn_mode, node->tn_uid, node->tn_gid, 1345 (intmax_t)node->tn_size, node->tn_status); 1346 1347 if (vp->v_type == VFIFO) 1348 fifo_printinfo(vp); 1349 1350 printf("\n"); 1351 1352 return 0; 1353 } 1354 1355 int 1356 tmpfs_pathconf(struct vop_pathconf_args *v) 1357 { 1358 struct vnode *vp = v->a_vp; 1359 int name = v->a_name; 1360 register_t *retval = v->a_retval; 1361 1362 int error; 1363 1364 error = 0; 1365 1366 switch (name) { 1367 case _PC_LINK_MAX: 1368 *retval = LINK_MAX; 1369 break; 1370 1371 case _PC_NAME_MAX: 1372 *retval = NAME_MAX; 1373 break; 1374 1375 case _PC_PIPE_BUF: 1376 if (vp->v_type == VDIR || vp->v_type == VFIFO) 1377 *retval = PIPE_BUF; 1378 else 1379 error = EINVAL; 1380 break; 1381 1382 case _PC_CHOWN_RESTRICTED: 1383 *retval = 1; 1384 break; 1385 1386 case _PC_NO_TRUNC: 1387 *retval = 1; 1388 break; 1389 1390 case _PC_SYNC_IO: 1391 *retval = 1; 1392 break; 1393 1394 case _PC_FILESIZEBITS: 1395 *retval = 64; 1396 break; 1397 1398 default: 1399 error = vop_stdpathconf(v); 1400 } 1401 1402 return error; 1403 } 1404 1405 static int 1406 tmpfs_vptofh(struct vop_vptofh_args *ap) 1407 { 1408 struct tmpfs_fid *tfhp; 1409 struct tmpfs_node *node; 1410 1411 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1412 node = VP_TO_TMPFS_NODE(ap->a_vp); 1413 1414 tfhp->tf_len = sizeof(struct tmpfs_fid); 1415 tfhp->tf_id = node->tn_id; 1416 tfhp->tf_gen = node->tn_gen; 1417 1418 return (0); 1419 } 1420 1421 static int 1422 tmpfs_whiteout(struct vop_whiteout_args *ap) 1423 { 1424 struct vnode *dvp = ap->a_dvp; 1425 struct componentname *cnp = ap->a_cnp; 1426 struct tmpfs_dirent *de; 1427 1428 switch (ap->a_flags) { 1429 case LOOKUP: 1430 return (0); 1431 case CREATE: 1432 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1433 if (de != NULL) 1434 return (de->td_node == NULL ? 0 : EEXIST); 1435 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1436 case DELETE: 1437 tmpfs_dir_whiteout_remove(dvp, cnp); 1438 return (0); 1439 default: 1440 panic("tmpfs_whiteout: unknown op"); 1441 } 1442 } 1443 1444 static int 1445 tmpfs_vptocnp_dir(struct tmpfs_node *tn, struct tmpfs_node *tnp, 1446 struct tmpfs_dirent **pde) 1447 { 1448 struct tmpfs_dir_cursor dc; 1449 struct tmpfs_dirent *de; 1450 1451 for (de = tmpfs_dir_first(tnp, &dc); de != NULL; 1452 de = tmpfs_dir_next(tnp, &dc)) { 1453 if (de->td_node == tn) { 1454 *pde = de; 1455 return (0); 1456 } 1457 } 1458 return (ENOENT); 1459 } 1460 1461 static int 1462 tmpfs_vptocnp_fill(struct vnode *vp, struct tmpfs_node *tn, 1463 struct tmpfs_node *tnp, char *buf, int *buflen, struct vnode **dvp) 1464 { 1465 struct tmpfs_dirent *de; 1466 int error, i; 1467 1468 error = vn_vget_ino_gen(vp, tmpfs_vn_get_ino_alloc, tnp, LK_SHARED, 1469 dvp); 1470 if (error != 0) 1471 return (error); 1472 error = tmpfs_vptocnp_dir(tn, tnp, &de); 1473 if (error == 0) { 1474 i = *buflen; 1475 i -= de->td_namelen; 1476 if (i < 0) { 1477 error = ENOMEM; 1478 } else { 1479 bcopy(de->ud.td_name, buf + i, de->td_namelen); 1480 *buflen = i; 1481 } 1482 } 1483 if (error == 0) { 1484 if (vp != *dvp) 1485 VOP_UNLOCK(*dvp, 0); 1486 } else { 1487 if (vp != *dvp) 1488 vput(*dvp); 1489 else 1490 vrele(vp); 1491 } 1492 return (error); 1493 } 1494 1495 static int 1496 tmpfs_vptocnp(struct vop_vptocnp_args *ap) 1497 { 1498 struct vnode *vp, **dvp; 1499 struct tmpfs_node *tn, *tnp, *tnp1; 1500 struct tmpfs_dirent *de; 1501 struct tmpfs_mount *tm; 1502 char *buf; 1503 int *buflen; 1504 int error; 1505 1506 vp = ap->a_vp; 1507 dvp = ap->a_vpp; 1508 buf = ap->a_buf; 1509 buflen = ap->a_buflen; 1510 1511 tm = VFS_TO_TMPFS(vp->v_mount); 1512 tn = VP_TO_TMPFS_NODE(vp); 1513 if (tn->tn_type == VDIR) { 1514 tnp = tn->tn_dir.tn_parent; 1515 if (tnp == NULL) 1516 return (ENOENT); 1517 tmpfs_ref_node(tnp); 1518 error = tmpfs_vptocnp_fill(vp, tn, tn->tn_dir.tn_parent, buf, 1519 buflen, dvp); 1520 tmpfs_free_node(tm, tnp); 1521 return (error); 1522 } 1523 restart: 1524 TMPFS_LOCK(tm); 1525 LIST_FOREACH_SAFE(tnp, &tm->tm_nodes_used, tn_entries, tnp1) { 1526 if (tnp->tn_type != VDIR) 1527 continue; 1528 TMPFS_NODE_LOCK(tnp); 1529 tmpfs_ref_node_locked(tnp); 1530 1531 /* 1532 * tn_vnode cannot be instantiated while we hold the 1533 * node lock, so the directory cannot be changed while 1534 * we iterate over it. Do this to avoid instantiating 1535 * vnode for directories which cannot point to our 1536 * node. 1537 */ 1538 error = tnp->tn_vnode == NULL ? tmpfs_vptocnp_dir(tn, tnp, 1539 &de) : 0; 1540 1541 if (error == 0) { 1542 TMPFS_NODE_UNLOCK(tnp); 1543 TMPFS_UNLOCK(tm); 1544 error = tmpfs_vptocnp_fill(vp, tn, tnp, buf, buflen, 1545 dvp); 1546 if (error == 0) { 1547 tmpfs_free_node(tm, tnp); 1548 return (0); 1549 } 1550 if ((vp->v_iflag & VI_DOOMED) != 0) { 1551 tmpfs_free_node(tm, tnp); 1552 return (ENOENT); 1553 } 1554 TMPFS_LOCK(tm); 1555 TMPFS_NODE_LOCK(tnp); 1556 } 1557 if (tmpfs_free_node_locked(tm, tnp, false)) { 1558 goto restart; 1559 } else { 1560 KASSERT(tnp->tn_refcount > 0, 1561 ("node %p refcount zero", tnp)); 1562 tnp1 = LIST_NEXT(tnp, tn_entries); 1563 TMPFS_NODE_UNLOCK(tnp); 1564 } 1565 } 1566 TMPFS_UNLOCK(tm); 1567 return (ENOENT); 1568 } 1569 1570 /* 1571 * Vnode operations vector used for files stored in a tmpfs file system. 1572 */ 1573 struct vop_vector tmpfs_vnodeop_entries = { 1574 .vop_default = &default_vnodeops, 1575 .vop_lookup = vfs_cache_lookup, 1576 .vop_cachedlookup = tmpfs_cached_lookup, 1577 .vop_create = tmpfs_create, 1578 .vop_mknod = tmpfs_mknod, 1579 .vop_open = tmpfs_open, 1580 .vop_close = tmpfs_close, 1581 .vop_access = tmpfs_access, 1582 .vop_getattr = tmpfs_getattr, 1583 .vop_setattr = tmpfs_setattr, 1584 .vop_read = tmpfs_read, 1585 .vop_write = tmpfs_write, 1586 .vop_fsync = tmpfs_fsync, 1587 .vop_remove = tmpfs_remove, 1588 .vop_link = tmpfs_link, 1589 .vop_rename = tmpfs_rename, 1590 .vop_mkdir = tmpfs_mkdir, 1591 .vop_rmdir = tmpfs_rmdir, 1592 .vop_symlink = tmpfs_symlink, 1593 .vop_readdir = tmpfs_readdir, 1594 .vop_readlink = tmpfs_readlink, 1595 .vop_inactive = tmpfs_inactive, 1596 .vop_reclaim = tmpfs_reclaim, 1597 .vop_print = tmpfs_print, 1598 .vop_pathconf = tmpfs_pathconf, 1599 .vop_vptofh = tmpfs_vptofh, 1600 .vop_whiteout = tmpfs_whiteout, 1601 .vop_bmap = VOP_EOPNOTSUPP, 1602 .vop_vptocnp = tmpfs_vptocnp, 1603 }; 1604 1605 /* 1606 * Same vector for mounts which do not use namecache. 1607 */ 1608 struct vop_vector tmpfs_vnodeop_nonc_entries = { 1609 .vop_default = &tmpfs_vnodeop_entries, 1610 .vop_lookup = tmpfs_lookup, 1611 };
Cache object: 65170cfe93989e17586b912b03c21c23
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