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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 * SPDX-License-Identifier: BSD-2-Clause-NetBSD 5 * 6 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to The NetBSD Foundation 10 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 11 * 2005 program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 * POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 /* 36 * tmpfs vnode interface. 37 */ 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD: releng/12.0/sys/fs/tmpfs/tmpfs_vnops.c 341085 2018-11-27 17:58:25Z markj $"); 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/dirent.h> 44 #include <sys/fcntl.h> 45 #include <sys/limits.h> 46 #include <sys/lockf.h> 47 #include <sys/lock.h> 48 #include <sys/mount.h> 49 #include <sys/namei.h> 50 #include <sys/priv.h> 51 #include <sys/proc.h> 52 #include <sys/rwlock.h> 53 #include <sys/sched.h> 54 #include <sys/stat.h> 55 #include <sys/sysctl.h> 56 #include <sys/unistd.h> 57 #include <sys/vnode.h> 58 59 #include <vm/vm.h> 60 #include <vm/vm_param.h> 61 #include <vm/vm_object.h> 62 #include <vm/vm_page.h> 63 #include <vm/vm_pager.h> 64 65 #include <fs/tmpfs/tmpfs_vnops.h> 66 #include <fs/tmpfs/tmpfs.h> 67 68 SYSCTL_DECL(_vfs_tmpfs); 69 70 static volatile int tmpfs_rename_restarts; 71 SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD, 72 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0, 73 "Times rename had to restart due to lock contention"); 74 75 static int 76 tmpfs_vn_get_ino_alloc(struct mount *mp, void *arg, int lkflags, 77 struct vnode **rvp) 78 { 79 80 return (tmpfs_alloc_vp(mp, arg, lkflags, rvp)); 81 } 82 83 static int 84 tmpfs_lookup1(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp) 85 { 86 struct tmpfs_dirent *de; 87 struct tmpfs_node *dnode, *pnode; 88 struct tmpfs_mount *tm; 89 int error; 90 91 dnode = VP_TO_TMPFS_DIR(dvp); 92 *vpp = NULLVP; 93 94 /* Check accessibility of requested node as a first step. */ 95 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 96 if (error != 0) 97 goto out; 98 99 /* We cannot be requesting the parent directory of the root node. */ 100 MPASS(IMPLIES(dnode->tn_type == VDIR && 101 dnode->tn_dir.tn_parent == dnode, 102 !(cnp->cn_flags & ISDOTDOT))); 103 104 TMPFS_ASSERT_LOCKED(dnode); 105 if (dnode->tn_dir.tn_parent == NULL) { 106 error = ENOENT; 107 goto out; 108 } 109 if (cnp->cn_flags & ISDOTDOT) { 110 tm = VFS_TO_TMPFS(dvp->v_mount); 111 pnode = dnode->tn_dir.tn_parent; 112 tmpfs_ref_node(pnode); 113 error = vn_vget_ino_gen(dvp, tmpfs_vn_get_ino_alloc, 114 pnode, cnp->cn_lkflags, vpp); 115 tmpfs_free_node(tm, pnode); 116 if (error != 0) 117 goto out; 118 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 119 VREF(dvp); 120 *vpp = dvp; 121 error = 0; 122 } else { 123 de = tmpfs_dir_lookup(dnode, NULL, cnp); 124 if (de != NULL && de->td_node == NULL) 125 cnp->cn_flags |= ISWHITEOUT; 126 if (de == NULL || de->td_node == NULL) { 127 /* 128 * The entry was not found in the directory. 129 * This is OK if we are creating or renaming an 130 * entry and are working on the last component of 131 * the path name. 132 */ 133 if ((cnp->cn_flags & ISLASTCN) && 134 (cnp->cn_nameiop == CREATE || \ 135 cnp->cn_nameiop == RENAME || 136 (cnp->cn_nameiop == DELETE && 137 cnp->cn_flags & DOWHITEOUT && 138 cnp->cn_flags & ISWHITEOUT))) { 139 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 140 cnp->cn_thread); 141 if (error != 0) 142 goto out; 143 144 /* 145 * Keep the component name in the buffer for 146 * future uses. 147 */ 148 cnp->cn_flags |= SAVENAME; 149 150 error = EJUSTRETURN; 151 } else 152 error = ENOENT; 153 } else { 154 struct tmpfs_node *tnode; 155 156 /* 157 * The entry was found, so get its associated 158 * tmpfs_node. 159 */ 160 tnode = de->td_node; 161 162 /* 163 * If we are not at the last path component and 164 * found a non-directory or non-link entry (which 165 * may itself be pointing to a directory), raise 166 * an error. 167 */ 168 if ((tnode->tn_type != VDIR && 169 tnode->tn_type != VLNK) && 170 !(cnp->cn_flags & ISLASTCN)) { 171 error = ENOTDIR; 172 goto out; 173 } 174 175 /* 176 * If we are deleting or renaming the entry, keep 177 * track of its tmpfs_dirent so that it can be 178 * easily deleted later. 179 */ 180 if ((cnp->cn_flags & ISLASTCN) && 181 (cnp->cn_nameiop == DELETE || 182 cnp->cn_nameiop == RENAME)) { 183 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 184 cnp->cn_thread); 185 if (error != 0) 186 goto out; 187 188 /* Allocate a new vnode on the matching entry. */ 189 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 190 cnp->cn_lkflags, vpp); 191 if (error != 0) 192 goto out; 193 194 if ((dnode->tn_mode & S_ISTXT) && 195 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, 196 cnp->cn_thread) && VOP_ACCESS(*vpp, VADMIN, 197 cnp->cn_cred, cnp->cn_thread)) { 198 error = EPERM; 199 vput(*vpp); 200 *vpp = NULL; 201 goto out; 202 } 203 cnp->cn_flags |= SAVENAME; 204 } else { 205 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 206 cnp->cn_lkflags, vpp); 207 if (error != 0) 208 goto out; 209 } 210 } 211 } 212 213 /* 214 * Store the result of this lookup in the cache. Avoid this if the 215 * request was for creation, as it does not improve timings on 216 * emprical tests. 217 */ 218 if ((cnp->cn_flags & MAKEENTRY) != 0 && tmpfs_use_nc(dvp)) 219 cache_enter(dvp, *vpp, cnp); 220 221 out: 222 /* 223 * If there were no errors, *vpp cannot be null and it must be 224 * locked. 225 */ 226 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 227 228 return (error); 229 } 230 231 static int 232 tmpfs_cached_lookup(struct vop_cachedlookup_args *v) 233 { 234 235 return (tmpfs_lookup1(v->a_dvp, v->a_vpp, v->a_cnp)); 236 } 237 238 static int 239 tmpfs_lookup(struct vop_lookup_args *v) 240 { 241 242 return (tmpfs_lookup1(v->a_dvp, v->a_vpp, v->a_cnp)); 243 } 244 245 static int 246 tmpfs_create(struct vop_create_args *v) 247 { 248 struct vnode *dvp = v->a_dvp; 249 struct vnode **vpp = v->a_vpp; 250 struct componentname *cnp = v->a_cnp; 251 struct vattr *vap = v->a_vap; 252 int error; 253 254 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 255 256 error = tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 257 if (error == 0 && (cnp->cn_flags & MAKEENTRY) != 0 && tmpfs_use_nc(dvp)) 258 cache_enter(dvp, *vpp, cnp); 259 return (error); 260 } 261 262 static int 263 tmpfs_mknod(struct vop_mknod_args *v) 264 { 265 struct vnode *dvp = v->a_dvp; 266 struct vnode **vpp = v->a_vpp; 267 struct componentname *cnp = v->a_cnp; 268 struct vattr *vap = v->a_vap; 269 270 if (vap->va_type != VBLK && vap->va_type != VCHR && 271 vap->va_type != VFIFO) 272 return EINVAL; 273 274 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 275 } 276 277 static int 278 tmpfs_open(struct vop_open_args *v) 279 { 280 struct vnode *vp = v->a_vp; 281 int mode = v->a_mode; 282 283 int error; 284 struct tmpfs_node *node; 285 286 MPASS(VOP_ISLOCKED(vp)); 287 288 node = VP_TO_TMPFS_NODE(vp); 289 290 /* The file is still active but all its names have been removed 291 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 292 * it is about to die. */ 293 if (node->tn_links < 1) 294 return (ENOENT); 295 296 /* If the file is marked append-only, deny write requests. */ 297 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 298 error = EPERM; 299 else { 300 error = 0; 301 /* For regular files, the call below is nop. */ 302 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags & 303 OBJ_DEAD) == 0, ("dead object")); 304 vnode_create_vobject(vp, node->tn_size, v->a_td); 305 } 306 307 MPASS(VOP_ISLOCKED(vp)); 308 return error; 309 } 310 311 static int 312 tmpfs_close(struct vop_close_args *v) 313 { 314 struct vnode *vp = v->a_vp; 315 316 /* Update node times. */ 317 tmpfs_update(vp); 318 319 return (0); 320 } 321 322 int 323 tmpfs_access(struct vop_access_args *v) 324 { 325 struct vnode *vp = v->a_vp; 326 accmode_t accmode = v->a_accmode; 327 struct ucred *cred = v->a_cred; 328 329 int error; 330 struct tmpfs_node *node; 331 332 MPASS(VOP_ISLOCKED(vp)); 333 334 node = VP_TO_TMPFS_NODE(vp); 335 336 switch (vp->v_type) { 337 case VDIR: 338 /* FALLTHROUGH */ 339 case VLNK: 340 /* FALLTHROUGH */ 341 case VREG: 342 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 343 error = EROFS; 344 goto out; 345 } 346 break; 347 348 case VBLK: 349 /* FALLTHROUGH */ 350 case VCHR: 351 /* FALLTHROUGH */ 352 case VSOCK: 353 /* FALLTHROUGH */ 354 case VFIFO: 355 break; 356 357 default: 358 error = EINVAL; 359 goto out; 360 } 361 362 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 363 error = EPERM; 364 goto out; 365 } 366 367 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 368 node->tn_gid, accmode, cred, NULL); 369 370 out: 371 MPASS(VOP_ISLOCKED(vp)); 372 373 return error; 374 } 375 376 int 377 tmpfs_getattr(struct vop_getattr_args *v) 378 { 379 struct vnode *vp = v->a_vp; 380 struct vattr *vap = v->a_vap; 381 vm_object_t obj; 382 struct tmpfs_node *node; 383 384 node = VP_TO_TMPFS_NODE(vp); 385 386 tmpfs_update(vp); 387 388 vap->va_type = vp->v_type; 389 vap->va_mode = node->tn_mode; 390 vap->va_nlink = node->tn_links; 391 vap->va_uid = node->tn_uid; 392 vap->va_gid = node->tn_gid; 393 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 394 vap->va_fileid = node->tn_id; 395 vap->va_size = node->tn_size; 396 vap->va_blocksize = PAGE_SIZE; 397 vap->va_atime = node->tn_atime; 398 vap->va_mtime = node->tn_mtime; 399 vap->va_ctime = node->tn_ctime; 400 vap->va_birthtime = node->tn_birthtime; 401 vap->va_gen = node->tn_gen; 402 vap->va_flags = node->tn_flags; 403 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 404 node->tn_rdev : NODEV; 405 if (vp->v_type == VREG) { 406 obj = node->tn_reg.tn_aobj; 407 vap->va_bytes = (u_quad_t)obj->resident_page_count * PAGE_SIZE; 408 } else 409 vap->va_bytes = node->tn_size; 410 vap->va_filerev = 0; 411 412 return 0; 413 } 414 415 int 416 tmpfs_setattr(struct vop_setattr_args *v) 417 { 418 struct vnode *vp = v->a_vp; 419 struct vattr *vap = v->a_vap; 420 struct ucred *cred = v->a_cred; 421 struct thread *td = curthread; 422 423 int error; 424 425 MPASS(VOP_ISLOCKED(vp)); 426 427 error = 0; 428 429 /* Abort if any unsettable attribute is given. */ 430 if (vap->va_type != VNON || 431 vap->va_nlink != VNOVAL || 432 vap->va_fsid != VNOVAL || 433 vap->va_fileid != VNOVAL || 434 vap->va_blocksize != VNOVAL || 435 vap->va_gen != VNOVAL || 436 vap->va_rdev != VNOVAL || 437 vap->va_bytes != VNOVAL) 438 error = EINVAL; 439 440 if (error == 0 && (vap->va_flags != VNOVAL)) 441 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 442 443 if (error == 0 && (vap->va_size != VNOVAL)) 444 error = tmpfs_chsize(vp, vap->va_size, cred, td); 445 446 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 447 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 448 449 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 450 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 451 452 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 453 vap->va_atime.tv_nsec != VNOVAL) || 454 (vap->va_mtime.tv_sec != VNOVAL && 455 vap->va_mtime.tv_nsec != VNOVAL) || 456 (vap->va_birthtime.tv_sec != VNOVAL && 457 vap->va_birthtime.tv_nsec != VNOVAL))) 458 error = tmpfs_chtimes(vp, vap, cred, td); 459 460 /* Update the node times. We give preference to the error codes 461 * generated by this function rather than the ones that may arise 462 * from tmpfs_update. */ 463 tmpfs_update(vp); 464 465 MPASS(VOP_ISLOCKED(vp)); 466 467 return error; 468 } 469 470 static int 471 tmpfs_read(struct vop_read_args *v) 472 { 473 struct vnode *vp; 474 struct uio *uio; 475 struct tmpfs_node *node; 476 477 vp = v->a_vp; 478 if (vp->v_type != VREG) 479 return (EISDIR); 480 uio = v->a_uio; 481 if (uio->uio_offset < 0) 482 return (EINVAL); 483 node = VP_TO_TMPFS_NODE(vp); 484 tmpfs_set_status(node, TMPFS_NODE_ACCESSED); 485 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio)); 486 } 487 488 static int 489 tmpfs_write(struct vop_write_args *v) 490 { 491 struct vnode *vp; 492 struct uio *uio; 493 struct tmpfs_node *node; 494 off_t oldsize; 495 int error, ioflag; 496 497 vp = v->a_vp; 498 uio = v->a_uio; 499 ioflag = v->a_ioflag; 500 error = 0; 501 node = VP_TO_TMPFS_NODE(vp); 502 oldsize = node->tn_size; 503 504 if (uio->uio_offset < 0 || vp->v_type != VREG) 505 return (EINVAL); 506 if (uio->uio_resid == 0) 507 return (0); 508 if (ioflag & IO_APPEND) 509 uio->uio_offset = node->tn_size; 510 if (uio->uio_offset + uio->uio_resid > 511 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 512 return (EFBIG); 513 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 514 return (EFBIG); 515 if (uio->uio_offset + uio->uio_resid > node->tn_size) { 516 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 517 FALSE); 518 if (error != 0) 519 goto out; 520 } 521 522 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio); 523 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 524 TMPFS_NODE_CHANGED; 525 if (node->tn_mode & (S_ISUID | S_ISGID)) { 526 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 527 node->tn_mode &= ~(S_ISUID | S_ISGID); 528 } 529 if (error != 0) 530 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 531 532 out: 533 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 534 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 535 536 return (error); 537 } 538 539 static int 540 tmpfs_fsync(struct vop_fsync_args *v) 541 { 542 struct vnode *vp = v->a_vp; 543 544 MPASS(VOP_ISLOCKED(vp)); 545 546 tmpfs_check_mtime(vp); 547 tmpfs_update(vp); 548 549 return 0; 550 } 551 552 static int 553 tmpfs_remove(struct vop_remove_args *v) 554 { 555 struct vnode *dvp = v->a_dvp; 556 struct vnode *vp = v->a_vp; 557 558 int error; 559 struct tmpfs_dirent *de; 560 struct tmpfs_mount *tmp; 561 struct tmpfs_node *dnode; 562 struct tmpfs_node *node; 563 564 MPASS(VOP_ISLOCKED(dvp)); 565 MPASS(VOP_ISLOCKED(vp)); 566 567 if (vp->v_type == VDIR) { 568 error = EISDIR; 569 goto out; 570 } 571 572 dnode = VP_TO_TMPFS_DIR(dvp); 573 node = VP_TO_TMPFS_NODE(vp); 574 tmp = VFS_TO_TMPFS(vp->v_mount); 575 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 576 MPASS(de != NULL); 577 578 /* Files marked as immutable or append-only cannot be deleted. */ 579 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 580 (dnode->tn_flags & APPEND)) { 581 error = EPERM; 582 goto out; 583 } 584 585 /* Remove the entry from the directory; as it is a file, we do not 586 * have to change the number of hard links of the directory. */ 587 tmpfs_dir_detach(dvp, de); 588 if (v->a_cnp->cn_flags & DOWHITEOUT) 589 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 590 591 /* Free the directory entry we just deleted. Note that the node 592 * referred by it will not be removed until the vnode is really 593 * reclaimed. */ 594 tmpfs_free_dirent(tmp, de); 595 596 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 597 error = 0; 598 599 out: 600 601 return error; 602 } 603 604 static int 605 tmpfs_link(struct vop_link_args *v) 606 { 607 struct vnode *dvp = v->a_tdvp; 608 struct vnode *vp = v->a_vp; 609 struct componentname *cnp = v->a_cnp; 610 611 int error; 612 struct tmpfs_dirent *de; 613 struct tmpfs_node *node; 614 615 MPASS(VOP_ISLOCKED(dvp)); 616 MPASS(cnp->cn_flags & HASBUF); 617 MPASS(dvp != vp); /* XXX When can this be false? */ 618 node = VP_TO_TMPFS_NODE(vp); 619 620 /* Ensure that we do not overflow the maximum number of links imposed 621 * by the system. */ 622 MPASS(node->tn_links <= TMPFS_LINK_MAX); 623 if (node->tn_links == TMPFS_LINK_MAX) { 624 error = EMLINK; 625 goto out; 626 } 627 628 /* We cannot create links of files marked immutable or append-only. */ 629 if (node->tn_flags & (IMMUTABLE | APPEND)) { 630 error = EPERM; 631 goto out; 632 } 633 634 /* Allocate a new directory entry to represent the node. */ 635 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 636 cnp->cn_nameptr, cnp->cn_namelen, &de); 637 if (error != 0) 638 goto out; 639 640 /* Insert the new directory entry into the appropriate directory. */ 641 if (cnp->cn_flags & ISWHITEOUT) 642 tmpfs_dir_whiteout_remove(dvp, cnp); 643 tmpfs_dir_attach(dvp, de); 644 645 /* vp link count has changed, so update node times. */ 646 node->tn_status |= TMPFS_NODE_CHANGED; 647 tmpfs_update(vp); 648 649 error = 0; 650 651 out: 652 return error; 653 } 654 655 /* 656 * We acquire all but fdvp locks using non-blocking acquisitions. If we 657 * fail to acquire any lock in the path we will drop all held locks, 658 * acquire the new lock in a blocking fashion, and then release it and 659 * restart the rename. This acquire/release step ensures that we do not 660 * spin on a lock waiting for release. On error release all vnode locks 661 * and decrement references the way tmpfs_rename() would do. 662 */ 663 static int 664 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 665 struct vnode *tdvp, struct vnode **tvpp, 666 struct componentname *fcnp, struct componentname *tcnp) 667 { 668 struct vnode *nvp; 669 struct mount *mp; 670 struct tmpfs_dirent *de; 671 int error, restarts = 0; 672 673 VOP_UNLOCK(tdvp, 0); 674 if (*tvpp != NULL && *tvpp != tdvp) 675 VOP_UNLOCK(*tvpp, 0); 676 mp = fdvp->v_mount; 677 678 relock: 679 restarts += 1; 680 error = vn_lock(fdvp, LK_EXCLUSIVE); 681 if (error) 682 goto releout; 683 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 684 VOP_UNLOCK(fdvp, 0); 685 error = vn_lock(tdvp, LK_EXCLUSIVE); 686 if (error) 687 goto releout; 688 VOP_UNLOCK(tdvp, 0); 689 goto relock; 690 } 691 /* 692 * Re-resolve fvp to be certain it still exists and fetch the 693 * correct vnode. 694 */ 695 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 696 if (de == NULL) { 697 VOP_UNLOCK(fdvp, 0); 698 VOP_UNLOCK(tdvp, 0); 699 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 700 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 701 error = EINVAL; 702 else 703 error = ENOENT; 704 goto releout; 705 } 706 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 707 if (error != 0) { 708 VOP_UNLOCK(fdvp, 0); 709 VOP_UNLOCK(tdvp, 0); 710 if (error != EBUSY) 711 goto releout; 712 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 713 if (error != 0) 714 goto releout; 715 VOP_UNLOCK(nvp, 0); 716 /* 717 * Concurrent rename race. 718 */ 719 if (nvp == tdvp) { 720 vrele(nvp); 721 error = EINVAL; 722 goto releout; 723 } 724 vrele(*fvpp); 725 *fvpp = nvp; 726 goto relock; 727 } 728 vrele(*fvpp); 729 *fvpp = nvp; 730 VOP_UNLOCK(*fvpp, 0); 731 /* 732 * Re-resolve tvp and acquire the vnode lock if present. 733 */ 734 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 735 /* 736 * If tvp disappeared we just carry on. 737 */ 738 if (de == NULL && *tvpp != NULL) { 739 vrele(*tvpp); 740 *tvpp = NULL; 741 } 742 /* 743 * Get the tvp ino if the lookup succeeded. We may have to restart 744 * if the non-blocking acquire fails. 745 */ 746 if (de != NULL) { 747 nvp = NULL; 748 error = tmpfs_alloc_vp(mp, de->td_node, 749 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 750 if (*tvpp != NULL) 751 vrele(*tvpp); 752 *tvpp = nvp; 753 if (error != 0) { 754 VOP_UNLOCK(fdvp, 0); 755 VOP_UNLOCK(tdvp, 0); 756 if (error != EBUSY) 757 goto releout; 758 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 759 &nvp); 760 if (error != 0) 761 goto releout; 762 VOP_UNLOCK(nvp, 0); 763 /* 764 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 765 */ 766 if (nvp == fdvp) { 767 error = ENOTEMPTY; 768 goto releout; 769 } 770 goto relock; 771 } 772 } 773 tmpfs_rename_restarts += restarts; 774 775 return (0); 776 777 releout: 778 vrele(fdvp); 779 vrele(*fvpp); 780 vrele(tdvp); 781 if (*tvpp != NULL) 782 vrele(*tvpp); 783 tmpfs_rename_restarts += restarts; 784 785 return (error); 786 } 787 788 static int 789 tmpfs_rename(struct vop_rename_args *v) 790 { 791 struct vnode *fdvp = v->a_fdvp; 792 struct vnode *fvp = v->a_fvp; 793 struct componentname *fcnp = v->a_fcnp; 794 struct vnode *tdvp = v->a_tdvp; 795 struct vnode *tvp = v->a_tvp; 796 struct componentname *tcnp = v->a_tcnp; 797 struct mount *mp = NULL; 798 799 char *newname; 800 int error; 801 struct tmpfs_dirent *de; 802 struct tmpfs_mount *tmp; 803 struct tmpfs_node *fdnode; 804 struct tmpfs_node *fnode; 805 struct tmpfs_node *tnode; 806 struct tmpfs_node *tdnode; 807 808 MPASS(VOP_ISLOCKED(tdvp)); 809 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 810 MPASS(fcnp->cn_flags & HASBUF); 811 MPASS(tcnp->cn_flags & HASBUF); 812 813 /* Disallow cross-device renames. 814 * XXX Why isn't this done by the caller? */ 815 if (fvp->v_mount != tdvp->v_mount || 816 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 817 error = EXDEV; 818 goto out; 819 } 820 821 /* If source and target are the same file, there is nothing to do. */ 822 if (fvp == tvp) { 823 error = 0; 824 goto out; 825 } 826 827 /* If we need to move the directory between entries, lock the 828 * source so that we can safely operate on it. */ 829 if (fdvp != tdvp && fdvp != tvp) { 830 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 831 mp = tdvp->v_mount; 832 error = vfs_busy(mp, 0); 833 if (error != 0) { 834 mp = NULL; 835 goto out; 836 } 837 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 838 fcnp, tcnp); 839 if (error != 0) { 840 vfs_unbusy(mp); 841 return (error); 842 } 843 ASSERT_VOP_ELOCKED(fdvp, 844 "tmpfs_rename: fdvp not locked"); 845 ASSERT_VOP_ELOCKED(tdvp, 846 "tmpfs_rename: tdvp not locked"); 847 if (tvp != NULL) 848 ASSERT_VOP_ELOCKED(tvp, 849 "tmpfs_rename: tvp not locked"); 850 if (fvp == tvp) { 851 error = 0; 852 goto out_locked; 853 } 854 } 855 } 856 857 tmp = VFS_TO_TMPFS(tdvp->v_mount); 858 tdnode = VP_TO_TMPFS_DIR(tdvp); 859 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 860 fdnode = VP_TO_TMPFS_DIR(fdvp); 861 fnode = VP_TO_TMPFS_NODE(fvp); 862 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 863 864 /* Entry can disappear before we lock fdvp, 865 * also avoid manipulating '.' and '..' entries. */ 866 if (de == NULL) { 867 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 868 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 869 error = EINVAL; 870 else 871 error = ENOENT; 872 goto out_locked; 873 } 874 MPASS(de->td_node == fnode); 875 876 /* If re-naming a directory to another preexisting directory 877 * ensure that the target directory is empty so that its 878 * removal causes no side effects. 879 * Kern_rename guarantees the destination to be a directory 880 * if the source is one. */ 881 if (tvp != NULL) { 882 MPASS(tnode != NULL); 883 884 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 885 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 886 error = EPERM; 887 goto out_locked; 888 } 889 890 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 891 if (tnode->tn_size > 0) { 892 error = ENOTEMPTY; 893 goto out_locked; 894 } 895 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 896 error = ENOTDIR; 897 goto out_locked; 898 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 899 error = EISDIR; 900 goto out_locked; 901 } else { 902 MPASS(fnode->tn_type != VDIR && 903 tnode->tn_type != VDIR); 904 } 905 } 906 907 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 908 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 909 error = EPERM; 910 goto out_locked; 911 } 912 913 /* Ensure that we have enough memory to hold the new name, if it 914 * has to be changed. */ 915 if (fcnp->cn_namelen != tcnp->cn_namelen || 916 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 917 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 918 } else 919 newname = NULL; 920 921 /* If the node is being moved to another directory, we have to do 922 * the move. */ 923 if (fdnode != tdnode) { 924 /* In case we are moving a directory, we have to adjust its 925 * parent to point to the new parent. */ 926 if (de->td_node->tn_type == VDIR) { 927 struct tmpfs_node *n; 928 929 /* Ensure the target directory is not a child of the 930 * directory being moved. Otherwise, we'd end up 931 * with stale nodes. */ 932 n = tdnode; 933 /* TMPFS_LOCK garanties that no nodes are freed while 934 * traversing the list. Nodes can only be marked as 935 * removed: tn_parent == NULL. */ 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 /* As a result of changing the target of the '..' 979 * entry, the link count of the source and target 980 * directories has to be adjusted. */ 981 TMPFS_NODE_LOCK(tdnode); 982 TMPFS_ASSERT_LOCKED(tdnode); 983 tdnode->tn_links++; 984 TMPFS_NODE_UNLOCK(tdnode); 985 986 TMPFS_NODE_LOCK(fdnode); 987 TMPFS_ASSERT_LOCKED(fdnode); 988 fdnode->tn_links--; 989 TMPFS_NODE_UNLOCK(fdnode); 990 } 991 } 992 993 /* Do the move: just remove the entry from the source directory 994 * and insert it into the target one. */ 995 tmpfs_dir_detach(fdvp, de); 996 997 if (fcnp->cn_flags & DOWHITEOUT) 998 tmpfs_dir_whiteout_add(fdvp, fcnp); 999 if (tcnp->cn_flags & ISWHITEOUT) 1000 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1001 1002 /* If the name has changed, we need to make it effective by changing 1003 * it in the directory entry. */ 1004 if (newname != NULL) { 1005 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1006 1007 free(de->ud.td_name, M_TMPFSNAME); 1008 de->ud.td_name = newname; 1009 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 1010 1011 fnode->tn_status |= TMPFS_NODE_CHANGED; 1012 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1013 } 1014 1015 /* If we are overwriting an entry, we have to remove the old one 1016 * from the target directory. */ 1017 if (tvp != NULL) { 1018 struct tmpfs_dirent *tde; 1019 1020 /* Remove the old entry from the target directory. */ 1021 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1022 tmpfs_dir_detach(tdvp, tde); 1023 1024 /* Free the directory entry we just deleted. Note that the 1025 * node referred by it will not be removed until the vnode is 1026 * really reclaimed. */ 1027 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1028 } 1029 1030 tmpfs_dir_attach(tdvp, de); 1031 1032 if (tmpfs_use_nc(fvp)) { 1033 cache_purge(fvp); 1034 if (tvp != NULL) 1035 cache_purge(tvp); 1036 cache_purge_negative(tdvp); 1037 } 1038 1039 error = 0; 1040 1041 out_locked: 1042 if (fdvp != tdvp && fdvp != tvp) 1043 VOP_UNLOCK(fdvp, 0); 1044 1045 out: 1046 /* Release target nodes. */ 1047 /* XXX: I don't understand when tdvp can be the same as tvp, but 1048 * other code takes care of this... */ 1049 if (tdvp == tvp) 1050 vrele(tdvp); 1051 else 1052 vput(tdvp); 1053 if (tvp != NULL) 1054 vput(tvp); 1055 1056 /* Release source nodes. */ 1057 vrele(fdvp); 1058 vrele(fvp); 1059 1060 if (mp != NULL) 1061 vfs_unbusy(mp); 1062 1063 return error; 1064 } 1065 1066 static int 1067 tmpfs_mkdir(struct vop_mkdir_args *v) 1068 { 1069 struct vnode *dvp = v->a_dvp; 1070 struct vnode **vpp = v->a_vpp; 1071 struct componentname *cnp = v->a_cnp; 1072 struct vattr *vap = v->a_vap; 1073 1074 MPASS(vap->va_type == VDIR); 1075 1076 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1077 } 1078 1079 static int 1080 tmpfs_rmdir(struct vop_rmdir_args *v) 1081 { 1082 struct vnode *dvp = v->a_dvp; 1083 struct vnode *vp = v->a_vp; 1084 1085 int error; 1086 struct tmpfs_dirent *de; 1087 struct tmpfs_mount *tmp; 1088 struct tmpfs_node *dnode; 1089 struct tmpfs_node *node; 1090 1091 MPASS(VOP_ISLOCKED(dvp)); 1092 MPASS(VOP_ISLOCKED(vp)); 1093 1094 tmp = VFS_TO_TMPFS(dvp->v_mount); 1095 dnode = VP_TO_TMPFS_DIR(dvp); 1096 node = VP_TO_TMPFS_DIR(vp); 1097 1098 /* Directories with more than two entries ('.' and '..') cannot be 1099 * removed. */ 1100 if (node->tn_size > 0) { 1101 error = ENOTEMPTY; 1102 goto out; 1103 } 1104 1105 if ((dnode->tn_flags & APPEND) 1106 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1107 error = EPERM; 1108 goto out; 1109 } 1110 1111 /* This invariant holds only if we are not trying to remove "..". 1112 * We checked for that above so this is safe now. */ 1113 MPASS(node->tn_dir.tn_parent == dnode); 1114 1115 /* Get the directory entry associated with node (vp). This was 1116 * filled by tmpfs_lookup while looking up the entry. */ 1117 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1118 MPASS(TMPFS_DIRENT_MATCHES(de, 1119 v->a_cnp->cn_nameptr, 1120 v->a_cnp->cn_namelen)); 1121 1122 /* Check flags to see if we are allowed to remove the directory. */ 1123 if ((dnode->tn_flags & APPEND) != 0 || 1124 (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) != 0) { 1125 error = EPERM; 1126 goto out; 1127 } 1128 1129 1130 /* Detach the directory entry from the directory (dnode). */ 1131 tmpfs_dir_detach(dvp, de); 1132 if (v->a_cnp->cn_flags & DOWHITEOUT) 1133 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1134 1135 /* No vnode should be allocated for this entry from this point */ 1136 TMPFS_NODE_LOCK(node); 1137 node->tn_links--; 1138 node->tn_dir.tn_parent = NULL; 1139 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1140 TMPFS_NODE_MODIFIED; 1141 1142 TMPFS_NODE_UNLOCK(node); 1143 1144 TMPFS_NODE_LOCK(dnode); 1145 dnode->tn_links--; 1146 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1147 TMPFS_NODE_MODIFIED; 1148 TMPFS_NODE_UNLOCK(dnode); 1149 1150 if (tmpfs_use_nc(dvp)) { 1151 cache_purge(dvp); 1152 cache_purge(vp); 1153 } 1154 1155 /* Free the directory entry we just deleted. Note that the node 1156 * referred by it will not be removed until the vnode is really 1157 * reclaimed. */ 1158 tmpfs_free_dirent(tmp, de); 1159 1160 /* Release the deleted vnode (will destroy the node, notify 1161 * interested parties and clean it from the cache). */ 1162 1163 dnode->tn_status |= TMPFS_NODE_CHANGED; 1164 tmpfs_update(dvp); 1165 1166 error = 0; 1167 1168 out: 1169 return error; 1170 } 1171 1172 static int 1173 tmpfs_symlink(struct vop_symlink_args *v) 1174 { 1175 struct vnode *dvp = v->a_dvp; 1176 struct vnode **vpp = v->a_vpp; 1177 struct componentname *cnp = v->a_cnp; 1178 struct vattr *vap = v->a_vap; 1179 char *target = v->a_target; 1180 1181 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1182 MPASS(vap->va_type == VLNK); 1183 #else 1184 vap->va_type = VLNK; 1185 #endif 1186 1187 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1188 } 1189 1190 static int 1191 tmpfs_readdir(struct vop_readdir_args *v) 1192 { 1193 struct vnode *vp = v->a_vp; 1194 struct uio *uio = v->a_uio; 1195 int *eofflag = v->a_eofflag; 1196 u_long **cookies = v->a_cookies; 1197 int *ncookies = v->a_ncookies; 1198 1199 int error; 1200 ssize_t startresid; 1201 int maxcookies; 1202 struct tmpfs_node *node; 1203 1204 /* This operation only makes sense on directory nodes. */ 1205 if (vp->v_type != VDIR) 1206 return ENOTDIR; 1207 1208 maxcookies = 0; 1209 node = VP_TO_TMPFS_DIR(vp); 1210 1211 startresid = uio->uio_resid; 1212 1213 /* Allocate cookies for NFS and compat modules. */ 1214 if (cookies != NULL && ncookies != NULL) { 1215 maxcookies = howmany(node->tn_size, 1216 sizeof(struct tmpfs_dirent)) + 2; 1217 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1218 M_WAITOK); 1219 *ncookies = 0; 1220 } 1221 1222 if (cookies == NULL) 1223 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1224 else 1225 error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies, 1226 ncookies); 1227 1228 /* Buffer was filled without hitting EOF. */ 1229 if (error == EJUSTRETURN) 1230 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1231 1232 if (error != 0 && cookies != NULL && ncookies != NULL) { 1233 free(*cookies, M_TEMP); 1234 *cookies = NULL; 1235 *ncookies = 0; 1236 } 1237 1238 if (eofflag != NULL) 1239 *eofflag = 1240 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1241 1242 return error; 1243 } 1244 1245 static int 1246 tmpfs_readlink(struct vop_readlink_args *v) 1247 { 1248 struct vnode *vp = v->a_vp; 1249 struct uio *uio = v->a_uio; 1250 1251 int error; 1252 struct tmpfs_node *node; 1253 1254 MPASS(uio->uio_offset == 0); 1255 MPASS(vp->v_type == VLNK); 1256 1257 node = VP_TO_TMPFS_NODE(vp); 1258 1259 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1260 uio); 1261 tmpfs_set_status(node, TMPFS_NODE_ACCESSED); 1262 1263 return (error); 1264 } 1265 1266 static int 1267 tmpfs_inactive(struct vop_inactive_args *v) 1268 { 1269 struct vnode *vp; 1270 struct tmpfs_node *node; 1271 1272 vp = v->a_vp; 1273 node = VP_TO_TMPFS_NODE(vp); 1274 if (node->tn_links == 0) 1275 vrecycle(vp); 1276 else 1277 tmpfs_check_mtime(vp); 1278 return (0); 1279 } 1280 1281 int 1282 tmpfs_reclaim(struct vop_reclaim_args *v) 1283 { 1284 struct vnode *vp = v->a_vp; 1285 1286 struct tmpfs_mount *tmp; 1287 struct tmpfs_node *node; 1288 1289 node = VP_TO_TMPFS_NODE(vp); 1290 tmp = VFS_TO_TMPFS(vp->v_mount); 1291 1292 if (vp->v_type == VREG) 1293 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1294 else 1295 vnode_destroy_vobject(vp); 1296 vp->v_object = NULL; 1297 if (tmpfs_use_nc(vp)) 1298 cache_purge(vp); 1299 1300 TMPFS_NODE_LOCK(node); 1301 tmpfs_free_vp(vp); 1302 1303 /* If the node referenced by this vnode was deleted by the user, 1304 * we must free its associated data structures (now that the vnode 1305 * is being reclaimed). */ 1306 if (node->tn_links == 0 && 1307 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1308 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1309 TMPFS_NODE_UNLOCK(node); 1310 tmpfs_free_node(tmp, node); 1311 } else 1312 TMPFS_NODE_UNLOCK(node); 1313 1314 MPASS(vp->v_data == NULL); 1315 return 0; 1316 } 1317 1318 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 %jd\n", 1328 node, node->tn_flags, (uintmax_t)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 int 1342 tmpfs_pathconf(struct vop_pathconf_args *v) 1343 { 1344 struct vnode *vp = v->a_vp; 1345 int name = v->a_name; 1346 long *retval = v->a_retval; 1347 1348 int error; 1349 1350 error = 0; 1351 1352 switch (name) { 1353 case _PC_LINK_MAX: 1354 *retval = TMPFS_LINK_MAX; 1355 break; 1356 1357 case _PC_NAME_MAX: 1358 *retval = NAME_MAX; 1359 break; 1360 1361 case _PC_PIPE_BUF: 1362 if (vp->v_type == VDIR || vp->v_type == VFIFO) 1363 *retval = PIPE_BUF; 1364 else 1365 error = EINVAL; 1366 break; 1367 1368 case _PC_CHOWN_RESTRICTED: 1369 *retval = 1; 1370 break; 1371 1372 case _PC_NO_TRUNC: 1373 *retval = 1; 1374 break; 1375 1376 case _PC_SYNC_IO: 1377 *retval = 1; 1378 break; 1379 1380 case _PC_FILESIZEBITS: 1381 *retval = 64; 1382 break; 1383 1384 default: 1385 error = vop_stdpathconf(v); 1386 } 1387 1388 return error; 1389 } 1390 1391 static int 1392 tmpfs_vptofh(struct vop_vptofh_args *ap) 1393 { 1394 struct tmpfs_fid *tfhp; 1395 struct tmpfs_node *node; 1396 1397 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1398 node = VP_TO_TMPFS_NODE(ap->a_vp); 1399 1400 tfhp->tf_len = sizeof(struct tmpfs_fid); 1401 tfhp->tf_id = node->tn_id; 1402 tfhp->tf_gen = node->tn_gen; 1403 1404 return (0); 1405 } 1406 1407 static int 1408 tmpfs_whiteout(struct vop_whiteout_args *ap) 1409 { 1410 struct vnode *dvp = ap->a_dvp; 1411 struct componentname *cnp = ap->a_cnp; 1412 struct tmpfs_dirent *de; 1413 1414 switch (ap->a_flags) { 1415 case LOOKUP: 1416 return (0); 1417 case CREATE: 1418 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1419 if (de != NULL) 1420 return (de->td_node == NULL ? 0 : EEXIST); 1421 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1422 case DELETE: 1423 tmpfs_dir_whiteout_remove(dvp, cnp); 1424 return (0); 1425 default: 1426 panic("tmpfs_whiteout: unknown op"); 1427 } 1428 } 1429 1430 static int 1431 tmpfs_vptocnp_dir(struct tmpfs_node *tn, struct tmpfs_node *tnp, 1432 struct tmpfs_dirent **pde) 1433 { 1434 struct tmpfs_dir_cursor dc; 1435 struct tmpfs_dirent *de; 1436 1437 for (de = tmpfs_dir_first(tnp, &dc); de != NULL; 1438 de = tmpfs_dir_next(tnp, &dc)) { 1439 if (de->td_node == tn) { 1440 *pde = de; 1441 return (0); 1442 } 1443 } 1444 return (ENOENT); 1445 } 1446 1447 static int 1448 tmpfs_vptocnp_fill(struct vnode *vp, struct tmpfs_node *tn, 1449 struct tmpfs_node *tnp, char *buf, int *buflen, struct vnode **dvp) 1450 { 1451 struct tmpfs_dirent *de; 1452 int error, i; 1453 1454 error = vn_vget_ino_gen(vp, tmpfs_vn_get_ino_alloc, tnp, LK_SHARED, 1455 dvp); 1456 if (error != 0) 1457 return (error); 1458 error = tmpfs_vptocnp_dir(tn, tnp, &de); 1459 if (error == 0) { 1460 i = *buflen; 1461 i -= de->td_namelen; 1462 if (i < 0) { 1463 error = ENOMEM; 1464 } else { 1465 bcopy(de->ud.td_name, buf + i, de->td_namelen); 1466 *buflen = i; 1467 } 1468 } 1469 if (error == 0) { 1470 if (vp != *dvp) 1471 VOP_UNLOCK(*dvp, 0); 1472 } else { 1473 if (vp != *dvp) 1474 vput(*dvp); 1475 else 1476 vrele(vp); 1477 } 1478 return (error); 1479 } 1480 1481 static int 1482 tmpfs_vptocnp(struct vop_vptocnp_args *ap) 1483 { 1484 struct vnode *vp, **dvp; 1485 struct tmpfs_node *tn, *tnp, *tnp1; 1486 struct tmpfs_dirent *de; 1487 struct tmpfs_mount *tm; 1488 char *buf; 1489 int *buflen; 1490 int error; 1491 1492 vp = ap->a_vp; 1493 dvp = ap->a_vpp; 1494 buf = ap->a_buf; 1495 buflen = ap->a_buflen; 1496 1497 tm = VFS_TO_TMPFS(vp->v_mount); 1498 tn = VP_TO_TMPFS_NODE(vp); 1499 if (tn->tn_type == VDIR) { 1500 tnp = tn->tn_dir.tn_parent; 1501 if (tnp == NULL) 1502 return (ENOENT); 1503 tmpfs_ref_node(tnp); 1504 error = tmpfs_vptocnp_fill(vp, tn, tn->tn_dir.tn_parent, buf, 1505 buflen, dvp); 1506 tmpfs_free_node(tm, tnp); 1507 return (error); 1508 } 1509 restart: 1510 TMPFS_LOCK(tm); 1511 LIST_FOREACH_SAFE(tnp, &tm->tm_nodes_used, tn_entries, tnp1) { 1512 if (tnp->tn_type != VDIR) 1513 continue; 1514 TMPFS_NODE_LOCK(tnp); 1515 tmpfs_ref_node_locked(tnp); 1516 1517 /* 1518 * tn_vnode cannot be instantiated while we hold the 1519 * node lock, so the directory cannot be changed while 1520 * we iterate over it. Do this to avoid instantiating 1521 * vnode for directories which cannot point to our 1522 * node. 1523 */ 1524 error = tnp->tn_vnode == NULL ? tmpfs_vptocnp_dir(tn, tnp, 1525 &de) : 0; 1526 1527 if (error == 0) { 1528 TMPFS_NODE_UNLOCK(tnp); 1529 TMPFS_UNLOCK(tm); 1530 error = tmpfs_vptocnp_fill(vp, tn, tnp, buf, buflen, 1531 dvp); 1532 if (error == 0) { 1533 tmpfs_free_node(tm, tnp); 1534 return (0); 1535 } 1536 if ((vp->v_iflag & VI_DOOMED) != 0) { 1537 tmpfs_free_node(tm, tnp); 1538 return (ENOENT); 1539 } 1540 TMPFS_LOCK(tm); 1541 TMPFS_NODE_LOCK(tnp); 1542 } 1543 if (tmpfs_free_node_locked(tm, tnp, false)) { 1544 goto restart; 1545 } else { 1546 KASSERT(tnp->tn_refcount > 0, 1547 ("node %p refcount zero", tnp)); 1548 tnp1 = LIST_NEXT(tnp, tn_entries); 1549 TMPFS_NODE_UNLOCK(tnp); 1550 } 1551 } 1552 TMPFS_UNLOCK(tm); 1553 return (ENOENT); 1554 } 1555 1556 /* 1557 * Vnode operations vector used for files stored in a tmpfs file system. 1558 */ 1559 struct vop_vector tmpfs_vnodeop_entries = { 1560 .vop_default = &default_vnodeops, 1561 .vop_lookup = vfs_cache_lookup, 1562 .vop_cachedlookup = tmpfs_cached_lookup, 1563 .vop_create = tmpfs_create, 1564 .vop_mknod = tmpfs_mknod, 1565 .vop_open = tmpfs_open, 1566 .vop_close = tmpfs_close, 1567 .vop_access = tmpfs_access, 1568 .vop_getattr = tmpfs_getattr, 1569 .vop_setattr = tmpfs_setattr, 1570 .vop_read = tmpfs_read, 1571 .vop_write = tmpfs_write, 1572 .vop_fsync = tmpfs_fsync, 1573 .vop_remove = tmpfs_remove, 1574 .vop_link = tmpfs_link, 1575 .vop_rename = tmpfs_rename, 1576 .vop_mkdir = tmpfs_mkdir, 1577 .vop_rmdir = tmpfs_rmdir, 1578 .vop_symlink = tmpfs_symlink, 1579 .vop_readdir = tmpfs_readdir, 1580 .vop_readlink = tmpfs_readlink, 1581 .vop_inactive = tmpfs_inactive, 1582 .vop_reclaim = tmpfs_reclaim, 1583 .vop_print = tmpfs_print, 1584 .vop_pathconf = tmpfs_pathconf, 1585 .vop_vptofh = tmpfs_vptofh, 1586 .vop_whiteout = tmpfs_whiteout, 1587 .vop_bmap = VOP_EOPNOTSUPP, 1588 .vop_vptocnp = tmpfs_vptocnp, 1589 }; 1590 1591 /* 1592 * Same vector for mounts which do not use namecache. 1593 */ 1594 struct vop_vector tmpfs_vnodeop_nonc_entries = { 1595 .vop_default = &tmpfs_vnodeop_entries, 1596 .vop_lookup = tmpfs_lookup, 1597 };
Cache object: 57e2ec51bd90bb256d62a53aedfe06ce
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