tmpfs_vnops.c revision 313094
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: stable/10/sys/fs/tmpfs/tmpfs_vnops.c 313094 2017-02-02 13:38:01Z 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/stat.h> 49#include <sys/systm.h> 50#include <sys/sysctl.h> 51#include <sys/unistd.h> 52#include <sys/vnode.h> 53 54#include <vm/vm.h> 55#include <vm/vm_param.h> 56#include <vm/vm_object.h> 57#include <vm/vm_page.h> 58#include <vm/vm_pager.h> 59 60#include <fs/tmpfs/tmpfs_vnops.h> 61#include <fs/tmpfs/tmpfs.h> 62 63SYSCTL_DECL(_vfs_tmpfs); 64 65static volatile int tmpfs_rename_restarts; 66SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD, 67 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0, 68 "Times rename had to restart due to lock contention"); 69 70static int 71tmpfs_vn_get_ino_alloc(struct mount *mp, void *arg, int lkflags, 72 struct vnode **rvp) 73{ 74 75 return (tmpfs_alloc_vp(mp, arg, lkflags, rvp)); 76} 77 78static int 79tmpfs_lookup(struct vop_cachedlookup_args *v) 80{ 81 struct vnode *dvp = v->a_dvp; 82 struct vnode **vpp = v->a_vpp; 83 struct componentname *cnp = v->a_cnp; 84 struct tmpfs_dirent *de; 85 struct tmpfs_node *dnode, *pnode; 86 struct tmpfs_mount *tm; 87 int error; 88 89 dnode = VP_TO_TMPFS_DIR(dvp); 90 *vpp = NULLVP; 91 92 /* Check accessibility of requested node as a first step. */ 93 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 94 if (error != 0) 95 goto out; 96 97 /* We cannot be requesting the parent directory of the root node. */ 98 MPASS(IMPLIES(dnode->tn_type == VDIR && 99 dnode->tn_dir.tn_parent == dnode, 100 !(cnp->cn_flags & ISDOTDOT))); 101 102 TMPFS_ASSERT_LOCKED(dnode); 103 if (dnode->tn_dir.tn_parent == NULL) { 104 error = ENOENT; 105 goto out; 106 } 107 if (cnp->cn_flags & ISDOTDOT) { 108 tm = VFS_TO_TMPFS(dvp->v_mount); 109 pnode = dnode->tn_dir.tn_parent; 110 tmpfs_ref_node(pnode); 111 error = vn_vget_ino_gen(dvp, tmpfs_vn_get_ino_alloc, 112 pnode, cnp->cn_lkflags, vpp); 113 tmpfs_free_node(tm, pnode); 114 if (error != 0) 115 goto out; 116 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 117 VREF(dvp); 118 *vpp = dvp; 119 error = 0; 120 } else { 121 de = tmpfs_dir_lookup(dnode, NULL, cnp); 122 if (de != NULL && de->td_node == NULL) 123 cnp->cn_flags |= ISWHITEOUT; 124 if (de == NULL || de->td_node == NULL) { 125 /* 126 * The entry was not found in the directory. 127 * This is OK if we are creating or renaming an 128 * entry and are working on the last component of 129 * the path name. 130 */ 131 if ((cnp->cn_flags & ISLASTCN) && 132 (cnp->cn_nameiop == CREATE || \ 133 cnp->cn_nameiop == RENAME || 134 (cnp->cn_nameiop == DELETE && 135 cnp->cn_flags & DOWHITEOUT && 136 cnp->cn_flags & ISWHITEOUT))) { 137 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 138 cnp->cn_thread); 139 if (error != 0) 140 goto out; 141 142 /* 143 * Keep the component name in the buffer for 144 * future uses. 145 */ 146 cnp->cn_flags |= SAVENAME; 147 148 error = EJUSTRETURN; 149 } else 150 error = ENOENT; 151 } else { 152 struct tmpfs_node *tnode; 153 154 /* 155 * The entry was found, so get its associated 156 * tmpfs_node. 157 */ 158 tnode = de->td_node; 159 160 /* 161 * If we are not at the last path component and 162 * found a non-directory or non-link entry (which 163 * may itself be pointing to a directory), raise 164 * an error. 165 */ 166 if ((tnode->tn_type != VDIR && 167 tnode->tn_type != VLNK) && 168 !(cnp->cn_flags & ISLASTCN)) { 169 error = ENOTDIR; 170 goto out; 171 } 172 173 /* 174 * If we are deleting or renaming the entry, keep 175 * track of its tmpfs_dirent so that it can be 176 * easily deleted later. 177 */ 178 if ((cnp->cn_flags & ISLASTCN) && 179 (cnp->cn_nameiop == DELETE || 180 cnp->cn_nameiop == RENAME)) { 181 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 182 cnp->cn_thread); 183 if (error != 0) 184 goto out; 185 186 /* Allocate a new vnode on the matching entry. */ 187 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 188 cnp->cn_lkflags, vpp); 189 if (error != 0) 190 goto out; 191 192 if ((dnode->tn_mode & S_ISTXT) && 193 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, 194 cnp->cn_thread) && VOP_ACCESS(*vpp, VADMIN, 195 cnp->cn_cred, cnp->cn_thread)) { 196 error = EPERM; 197 vput(*vpp); 198 *vpp = NULL; 199 goto out; 200 } 201 cnp->cn_flags |= SAVENAME; 202 } else { 203 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 204 cnp->cn_lkflags, vpp); 205 if (error != 0) 206 goto out; 207 } 208 } 209 } 210 211 /* 212 * Store the result of this lookup in the cache. Avoid this if the 213 * request was for creation, as it does not improve timings on 214 * emprical tests. 215 */ 216 if ((cnp->cn_flags & MAKEENTRY) != 0) 217 cache_enter(dvp, *vpp, cnp); 218 219out: 220 /* 221 * If there were no errors, *vpp cannot be null and it must be 222 * locked. 223 */ 224 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 225 226 return (error); 227} 228 229static int 230tmpfs_create(struct vop_create_args *v) 231{ 232 struct vnode *dvp = v->a_dvp; 233 struct vnode **vpp = v->a_vpp; 234 struct componentname *cnp = v->a_cnp; 235 struct vattr *vap = v->a_vap; 236 int error; 237 238 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 239 240 error = tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 241 if (error == 0 && (cnp->cn_flags & MAKEENTRY) != 0) 242 cache_enter(dvp, *vpp, cnp); 243 return (error); 244} 245 246static int 247tmpfs_mknod(struct vop_mknod_args *v) 248{ 249 struct vnode *dvp = v->a_dvp; 250 struct vnode **vpp = v->a_vpp; 251 struct componentname *cnp = v->a_cnp; 252 struct vattr *vap = v->a_vap; 253 254 if (vap->va_type != VBLK && vap->va_type != VCHR && 255 vap->va_type != VFIFO) 256 return EINVAL; 257 258 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 259} 260 261static int 262tmpfs_open(struct vop_open_args *v) 263{ 264 struct vnode *vp = v->a_vp; 265 int mode = v->a_mode; 266 267 int error; 268 struct tmpfs_node *node; 269 270 MPASS(VOP_ISLOCKED(vp)); 271 272 node = VP_TO_TMPFS_NODE(vp); 273 274 /* The file is still active but all its names have been removed 275 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 276 * it is about to die. */ 277 if (node->tn_links < 1) 278 return (ENOENT); 279 280 /* If the file is marked append-only, deny write requests. */ 281 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 282 error = EPERM; 283 else { 284 error = 0; 285 /* For regular files, the call below is nop. */ 286 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags & 287 OBJ_DEAD) == 0, ("dead object")); 288 vnode_create_vobject(vp, node->tn_size, v->a_td); 289 } 290 291 MPASS(VOP_ISLOCKED(vp)); 292 return error; 293} 294 295static int 296tmpfs_close(struct vop_close_args *v) 297{ 298 struct vnode *vp = v->a_vp; 299 300 /* Update node times. */ 301 tmpfs_update(vp); 302 303 return (0); 304} 305 306int 307tmpfs_access(struct vop_access_args *v) 308{ 309 struct vnode *vp = v->a_vp; 310 accmode_t accmode = v->a_accmode; 311 struct ucred *cred = v->a_cred; 312 313 int error; 314 struct tmpfs_node *node; 315 316 MPASS(VOP_ISLOCKED(vp)); 317 318 node = VP_TO_TMPFS_NODE(vp); 319 320 switch (vp->v_type) { 321 case VDIR: 322 /* FALLTHROUGH */ 323 case VLNK: 324 /* FALLTHROUGH */ 325 case VREG: 326 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 327 error = EROFS; 328 goto out; 329 } 330 break; 331 332 case VBLK: 333 /* FALLTHROUGH */ 334 case VCHR: 335 /* FALLTHROUGH */ 336 case VSOCK: 337 /* FALLTHROUGH */ 338 case VFIFO: 339 break; 340 341 default: 342 error = EINVAL; 343 goto out; 344 } 345 346 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 347 error = EPERM; 348 goto out; 349 } 350 351 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 352 node->tn_gid, accmode, cred, NULL); 353 354out: 355 MPASS(VOP_ISLOCKED(vp)); 356 357 return error; 358} 359 360int 361tmpfs_getattr(struct vop_getattr_args *v) 362{ 363 struct vnode *vp = v->a_vp; 364 struct vattr *vap = v->a_vap; 365 366 struct tmpfs_node *node; 367 368 node = VP_TO_TMPFS_NODE(vp); 369 370 tmpfs_update(vp); 371 372 vap->va_type = vp->v_type; 373 vap->va_mode = node->tn_mode; 374 vap->va_nlink = node->tn_links; 375 vap->va_uid = node->tn_uid; 376 vap->va_gid = node->tn_gid; 377 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 378 vap->va_fileid = node->tn_id; 379 vap->va_size = node->tn_size; 380 vap->va_blocksize = PAGE_SIZE; 381 vap->va_atime = node->tn_atime; 382 vap->va_mtime = node->tn_mtime; 383 vap->va_ctime = node->tn_ctime; 384 vap->va_birthtime = node->tn_birthtime; 385 vap->va_gen = node->tn_gen; 386 vap->va_flags = node->tn_flags; 387 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 388 node->tn_rdev : NODEV; 389 vap->va_bytes = round_page(node->tn_size); 390 vap->va_filerev = 0; 391 392 return 0; 393} 394 395int 396tmpfs_setattr(struct vop_setattr_args *v) 397{ 398 struct vnode *vp = v->a_vp; 399 struct vattr *vap = v->a_vap; 400 struct ucred *cred = v->a_cred; 401 struct thread *td = curthread; 402 403 int error; 404 405 MPASS(VOP_ISLOCKED(vp)); 406 407 error = 0; 408 409 /* Abort if any unsettable attribute is given. */ 410 if (vap->va_type != VNON || 411 vap->va_nlink != VNOVAL || 412 vap->va_fsid != VNOVAL || 413 vap->va_fileid != VNOVAL || 414 vap->va_blocksize != VNOVAL || 415 vap->va_gen != VNOVAL || 416 vap->va_rdev != VNOVAL || 417 vap->va_bytes != VNOVAL) 418 error = EINVAL; 419 420 if (error == 0 && (vap->va_flags != VNOVAL)) 421 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 422 423 if (error == 0 && (vap->va_size != VNOVAL)) 424 error = tmpfs_chsize(vp, vap->va_size, cred, td); 425 426 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 427 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 428 429 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 430 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 431 432 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 433 vap->va_atime.tv_nsec != VNOVAL) || 434 (vap->va_mtime.tv_sec != VNOVAL && 435 vap->va_mtime.tv_nsec != VNOVAL) || 436 (vap->va_birthtime.tv_sec != VNOVAL && 437 vap->va_birthtime.tv_nsec != VNOVAL))) 438 error = tmpfs_chtimes(vp, vap, cred, td); 439 440 /* Update the node times. We give preference to the error codes 441 * generated by this function rather than the ones that may arise 442 * from tmpfs_update. */ 443 tmpfs_update(vp); 444 445 MPASS(VOP_ISLOCKED(vp)); 446 447 return error; 448} 449 450static int 451tmpfs_read(struct vop_read_args *v) 452{ 453 struct vnode *vp; 454 struct uio *uio; 455 struct tmpfs_node *node; 456 457 vp = v->a_vp; 458 if (vp->v_type != VREG) 459 return (EISDIR); 460 uio = v->a_uio; 461 if (uio->uio_offset < 0) 462 return (EINVAL); 463 node = VP_TO_TMPFS_NODE(vp); 464 tmpfs_set_status(node, TMPFS_NODE_ACCESSED); 465 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio)); 466} 467 468static int 469tmpfs_write(struct vop_write_args *v) 470{ 471 struct vnode *vp; 472 struct uio *uio; 473 struct tmpfs_node *node; 474 off_t oldsize; 475 int error, ioflag; 476 477 vp = v->a_vp; 478 uio = v->a_uio; 479 ioflag = v->a_ioflag; 480 error = 0; 481 node = VP_TO_TMPFS_NODE(vp); 482 oldsize = node->tn_size; 483 484 if (uio->uio_offset < 0 || vp->v_type != VREG) 485 return (EINVAL); 486 if (uio->uio_resid == 0) 487 return (0); 488 if (ioflag & IO_APPEND) 489 uio->uio_offset = node->tn_size; 490 if (uio->uio_offset + uio->uio_resid > 491 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 492 return (EFBIG); 493 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 494 return (EFBIG); 495 if (uio->uio_offset + uio->uio_resid > node->tn_size) { 496 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 497 FALSE); 498 if (error != 0) 499 goto out; 500 } 501 502 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio); 503 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 504 TMPFS_NODE_CHANGED; 505 if (node->tn_mode & (S_ISUID | S_ISGID)) { 506 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 507 node->tn_mode &= ~(S_ISUID | S_ISGID); 508 } 509 if (error != 0) 510 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 511 512out: 513 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 514 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 515 516 return (error); 517} 518 519static int 520tmpfs_fsync(struct vop_fsync_args *v) 521{ 522 struct vnode *vp = v->a_vp; 523 524 MPASS(VOP_ISLOCKED(vp)); 525 526 tmpfs_check_mtime(vp); 527 tmpfs_update(vp); 528 529 return 0; 530} 531 532static int 533tmpfs_remove(struct vop_remove_args *v) 534{ 535 struct vnode *dvp = v->a_dvp; 536 struct vnode *vp = v->a_vp; 537 538 int error; 539 struct tmpfs_dirent *de; 540 struct tmpfs_mount *tmp; 541 struct tmpfs_node *dnode; 542 struct tmpfs_node *node; 543 544 MPASS(VOP_ISLOCKED(dvp)); 545 MPASS(VOP_ISLOCKED(vp)); 546 547 if (vp->v_type == VDIR) { 548 error = EISDIR; 549 goto out; 550 } 551 552 dnode = VP_TO_TMPFS_DIR(dvp); 553 node = VP_TO_TMPFS_NODE(vp); 554 tmp = VFS_TO_TMPFS(vp->v_mount); 555 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 556 MPASS(de != NULL); 557 558 /* Files marked as immutable or append-only cannot be deleted. */ 559 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 560 (dnode->tn_flags & APPEND)) { 561 error = EPERM; 562 goto out; 563 } 564 565 /* Remove the entry from the directory; as it is a file, we do not 566 * have to change the number of hard links of the directory. */ 567 tmpfs_dir_detach(dvp, de); 568 if (v->a_cnp->cn_flags & DOWHITEOUT) 569 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 570 571 /* Free the directory entry we just deleted. Note that the node 572 * referred by it will not be removed until the vnode is really 573 * reclaimed. */ 574 tmpfs_free_dirent(tmp, de); 575 576 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 577 error = 0; 578 579out: 580 581 return error; 582} 583 584static int 585tmpfs_link(struct vop_link_args *v) 586{ 587 struct vnode *dvp = v->a_tdvp; 588 struct vnode *vp = v->a_vp; 589 struct componentname *cnp = v->a_cnp; 590 591 int error; 592 struct tmpfs_dirent *de; 593 struct tmpfs_node *node; 594 595 MPASS(VOP_ISLOCKED(dvp)); 596 MPASS(cnp->cn_flags & HASBUF); 597 MPASS(dvp != vp); /* XXX When can this be false? */ 598 node = VP_TO_TMPFS_NODE(vp); 599 600 /* Ensure that we do not overflow the maximum number of links imposed 601 * by the system. */ 602 MPASS(node->tn_links <= LINK_MAX); 603 if (node->tn_links == LINK_MAX) { 604 error = EMLINK; 605 goto out; 606 } 607 608 /* We cannot create links of files marked immutable or append-only. */ 609 if (node->tn_flags & (IMMUTABLE | APPEND)) { 610 error = EPERM; 611 goto out; 612 } 613 614 /* Allocate a new directory entry to represent the node. */ 615 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 616 cnp->cn_nameptr, cnp->cn_namelen, &de); 617 if (error != 0) 618 goto out; 619 620 /* Insert the new directory entry into the appropriate directory. */ 621 if (cnp->cn_flags & ISWHITEOUT) 622 tmpfs_dir_whiteout_remove(dvp, cnp); 623 tmpfs_dir_attach(dvp, de); 624 625 /* vp link count has changed, so update node times. */ 626 node->tn_status |= TMPFS_NODE_CHANGED; 627 tmpfs_update(vp); 628 629 error = 0; 630 631out: 632 return error; 633} 634 635/* 636 * We acquire all but fdvp locks using non-blocking acquisitions. If we 637 * fail to acquire any lock in the path we will drop all held locks, 638 * acquire the new lock in a blocking fashion, and then release it and 639 * restart the rename. This acquire/release step ensures that we do not 640 * spin on a lock waiting for release. On error release all vnode locks 641 * and decrement references the way tmpfs_rename() would do. 642 */ 643static int 644tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 645 struct vnode *tdvp, struct vnode **tvpp, 646 struct componentname *fcnp, struct componentname *tcnp) 647{ 648 struct vnode *nvp; 649 struct mount *mp; 650 struct tmpfs_dirent *de; 651 int error, restarts = 0; 652 653 VOP_UNLOCK(tdvp, 0); 654 if (*tvpp != NULL && *tvpp != tdvp) 655 VOP_UNLOCK(*tvpp, 0); 656 mp = fdvp->v_mount; 657 658relock: 659 restarts += 1; 660 error = vn_lock(fdvp, LK_EXCLUSIVE); 661 if (error) 662 goto releout; 663 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 664 VOP_UNLOCK(fdvp, 0); 665 error = vn_lock(tdvp, LK_EXCLUSIVE); 666 if (error) 667 goto releout; 668 VOP_UNLOCK(tdvp, 0); 669 goto relock; 670 } 671 /* 672 * Re-resolve fvp to be certain it still exists and fetch the 673 * correct vnode. 674 */ 675 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 676 if (de == NULL) { 677 VOP_UNLOCK(fdvp, 0); 678 VOP_UNLOCK(tdvp, 0); 679 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 680 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 681 error = EINVAL; 682 else 683 error = ENOENT; 684 goto releout; 685 } 686 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 687 if (error != 0) { 688 VOP_UNLOCK(fdvp, 0); 689 VOP_UNLOCK(tdvp, 0); 690 if (error != EBUSY) 691 goto releout; 692 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 693 if (error != 0) 694 goto releout; 695 VOP_UNLOCK(nvp, 0); 696 /* 697 * Concurrent rename race. 698 */ 699 if (nvp == tdvp) { 700 vrele(nvp); 701 error = EINVAL; 702 goto releout; 703 } 704 vrele(*fvpp); 705 *fvpp = nvp; 706 goto relock; 707 } 708 vrele(*fvpp); 709 *fvpp = nvp; 710 VOP_UNLOCK(*fvpp, 0); 711 /* 712 * Re-resolve tvp and acquire the vnode lock if present. 713 */ 714 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 715 /* 716 * If tvp disappeared we just carry on. 717 */ 718 if (de == NULL && *tvpp != NULL) { 719 vrele(*tvpp); 720 *tvpp = NULL; 721 } 722 /* 723 * Get the tvp ino if the lookup succeeded. We may have to restart 724 * if the non-blocking acquire fails. 725 */ 726 if (de != NULL) { 727 nvp = NULL; 728 error = tmpfs_alloc_vp(mp, de->td_node, 729 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 730 if (*tvpp != NULL) 731 vrele(*tvpp); 732 *tvpp = nvp; 733 if (error != 0) { 734 VOP_UNLOCK(fdvp, 0); 735 VOP_UNLOCK(tdvp, 0); 736 if (error != EBUSY) 737 goto releout; 738 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 739 &nvp); 740 if (error != 0) 741 goto releout; 742 VOP_UNLOCK(nvp, 0); 743 /* 744 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 745 */ 746 if (nvp == fdvp) { 747 error = ENOTEMPTY; 748 goto releout; 749 } 750 goto relock; 751 } 752 } 753 tmpfs_rename_restarts += restarts; 754 755 return (0); 756 757releout: 758 vrele(fdvp); 759 vrele(*fvpp); 760 vrele(tdvp); 761 if (*tvpp != NULL) 762 vrele(*tvpp); 763 tmpfs_rename_restarts += restarts; 764 765 return (error); 766} 767 768static int 769tmpfs_rename(struct vop_rename_args *v) 770{ 771 struct vnode *fdvp = v->a_fdvp; 772 struct vnode *fvp = v->a_fvp; 773 struct componentname *fcnp = v->a_fcnp; 774 struct vnode *tdvp = v->a_tdvp; 775 struct vnode *tvp = v->a_tvp; 776 struct componentname *tcnp = v->a_tcnp; 777 struct mount *mp = NULL; 778 779 char *newname; 780 int error; 781 struct tmpfs_dirent *de; 782 struct tmpfs_mount *tmp; 783 struct tmpfs_node *fdnode; 784 struct tmpfs_node *fnode; 785 struct tmpfs_node *tnode; 786 struct tmpfs_node *tdnode; 787 788 MPASS(VOP_ISLOCKED(tdvp)); 789 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 790 MPASS(fcnp->cn_flags & HASBUF); 791 MPASS(tcnp->cn_flags & HASBUF); 792 793 /* Disallow cross-device renames. 794 * XXX Why isn't this done by the caller? */ 795 if (fvp->v_mount != tdvp->v_mount || 796 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 797 error = EXDEV; 798 goto out; 799 } 800 801 /* If source and target are the same file, there is nothing to do. */ 802 if (fvp == tvp) { 803 error = 0; 804 goto out; 805 } 806 807 /* If we need to move the directory between entries, lock the 808 * source so that we can safely operate on it. */ 809 if (fdvp != tdvp && fdvp != tvp) { 810 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 811 mp = tdvp->v_mount; 812 error = vfs_busy(mp, 0); 813 if (error != 0) { 814 mp = NULL; 815 goto out; 816 } 817 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 818 fcnp, tcnp); 819 if (error != 0) { 820 vfs_unbusy(mp); 821 return (error); 822 } 823 ASSERT_VOP_ELOCKED(fdvp, 824 "tmpfs_rename: fdvp not locked"); 825 ASSERT_VOP_ELOCKED(tdvp, 826 "tmpfs_rename: tdvp not locked"); 827 if (tvp != NULL) 828 ASSERT_VOP_ELOCKED(tvp, 829 "tmpfs_rename: tvp not locked"); 830 if (fvp == tvp) { 831 error = 0; 832 goto out_locked; 833 } 834 } 835 } 836 837 tmp = VFS_TO_TMPFS(tdvp->v_mount); 838 tdnode = VP_TO_TMPFS_DIR(tdvp); 839 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 840 fdnode = VP_TO_TMPFS_DIR(fdvp); 841 fnode = VP_TO_TMPFS_NODE(fvp); 842 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 843 844 /* Entry can disappear before we lock fdvp, 845 * also avoid manipulating '.' and '..' entries. */ 846 if (de == NULL) { 847 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 848 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 849 error = EINVAL; 850 else 851 error = ENOENT; 852 goto out_locked; 853 } 854 MPASS(de->td_node == fnode); 855 856 /* If re-naming a directory to another preexisting directory 857 * ensure that the target directory is empty so that its 858 * removal causes no side effects. 859 * Kern_rename gurantees the destination to be a directory 860 * if the source is one. */ 861 if (tvp != NULL) { 862 MPASS(tnode != NULL); 863 864 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 865 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 866 error = EPERM; 867 goto out_locked; 868 } 869 870 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 871 if (tnode->tn_size > 0) { 872 error = ENOTEMPTY; 873 goto out_locked; 874 } 875 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 876 error = ENOTDIR; 877 goto out_locked; 878 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 879 error = EISDIR; 880 goto out_locked; 881 } else { 882 MPASS(fnode->tn_type != VDIR && 883 tnode->tn_type != VDIR); 884 } 885 } 886 887 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 888 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 889 error = EPERM; 890 goto out_locked; 891 } 892 893 /* Ensure that we have enough memory to hold the new name, if it 894 * has to be changed. */ 895 if (fcnp->cn_namelen != tcnp->cn_namelen || 896 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 897 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 898 } else 899 newname = NULL; 900 901 /* If the node is being moved to another directory, we have to do 902 * the move. */ 903 if (fdnode != tdnode) { 904 /* In case we are moving a directory, we have to adjust its 905 * parent to point to the new parent. */ 906 if (de->td_node->tn_type == VDIR) { 907 struct tmpfs_node *n; 908 909 /* Ensure the target directory is not a child of the 910 * directory being moved. Otherwise, we'd end up 911 * with stale nodes. */ 912 n = tdnode; 913 /* TMPFS_LOCK garanties that no nodes are freed while 914 * traversing the list. Nodes can only be marked as 915 * removed: tn_parent == NULL. */ 916 TMPFS_LOCK(tmp); 917 TMPFS_NODE_LOCK(n); 918 while (n != n->tn_dir.tn_parent) { 919 struct tmpfs_node *parent; 920 921 if (n == fnode) { 922 TMPFS_NODE_UNLOCK(n); 923 TMPFS_UNLOCK(tmp); 924 error = EINVAL; 925 if (newname != NULL) 926 free(newname, M_TMPFSNAME); 927 goto out_locked; 928 } 929 parent = n->tn_dir.tn_parent; 930 TMPFS_NODE_UNLOCK(n); 931 if (parent == NULL) { 932 n = NULL; 933 break; 934 } 935 TMPFS_NODE_LOCK(parent); 936 if (parent->tn_dir.tn_parent == NULL) { 937 TMPFS_NODE_UNLOCK(parent); 938 n = NULL; 939 break; 940 } 941 n = parent; 942 } 943 TMPFS_UNLOCK(tmp); 944 if (n == NULL) { 945 error = EINVAL; 946 if (newname != NULL) 947 free(newname, M_TMPFSNAME); 948 goto out_locked; 949 } 950 TMPFS_NODE_UNLOCK(n); 951 952 /* Adjust the parent pointer. */ 953 TMPFS_VALIDATE_DIR(fnode); 954 TMPFS_NODE_LOCK(de->td_node); 955 de->td_node->tn_dir.tn_parent = tdnode; 956 TMPFS_NODE_UNLOCK(de->td_node); 957 958 /* As a result of changing the target of the '..' 959 * entry, the link count of the source and target 960 * directories has to be adjusted. */ 961 TMPFS_NODE_LOCK(tdnode); 962 TMPFS_ASSERT_LOCKED(tdnode); 963 tdnode->tn_links++; 964 TMPFS_NODE_UNLOCK(tdnode); 965 966 TMPFS_NODE_LOCK(fdnode); 967 TMPFS_ASSERT_LOCKED(fdnode); 968 fdnode->tn_links--; 969 TMPFS_NODE_UNLOCK(fdnode); 970 } 971 } 972 973 /* Do the move: just remove the entry from the source directory 974 * and insert it into the target one. */ 975 tmpfs_dir_detach(fdvp, de); 976 977 if (fcnp->cn_flags & DOWHITEOUT) 978 tmpfs_dir_whiteout_add(fdvp, fcnp); 979 if (tcnp->cn_flags & ISWHITEOUT) 980 tmpfs_dir_whiteout_remove(tdvp, tcnp); 981 982 /* If the name has changed, we need to make it effective by changing 983 * it in the directory entry. */ 984 if (newname != NULL) { 985 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 986 987 free(de->ud.td_name, M_TMPFSNAME); 988 de->ud.td_name = newname; 989 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 990 991 fnode->tn_status |= TMPFS_NODE_CHANGED; 992 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 993 } 994 995 /* If we are overwriting an entry, we have to remove the old one 996 * from the target directory. */ 997 if (tvp != NULL) { 998 struct tmpfs_dirent *tde; 999 1000 /* Remove the old entry from the target directory. */ 1001 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1002 tmpfs_dir_detach(tdvp, tde); 1003 1004 /* Free the directory entry we just deleted. Note that the 1005 * node referred by it will not be removed until the vnode is 1006 * really reclaimed. */ 1007 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1008 } 1009 1010 tmpfs_dir_attach(tdvp, de); 1011 1012 cache_purge(fvp); 1013 if (tvp != NULL) 1014 cache_purge(tvp); 1015 cache_purge_negative(tdvp); 1016 1017 error = 0; 1018 1019out_locked: 1020 if (fdvp != tdvp && fdvp != tvp) 1021 VOP_UNLOCK(fdvp, 0); 1022 1023out: 1024 /* Release target nodes. */ 1025 /* XXX: I don't understand when tdvp can be the same as tvp, but 1026 * other code takes care of this... */ 1027 if (tdvp == tvp) 1028 vrele(tdvp); 1029 else 1030 vput(tdvp); 1031 if (tvp != NULL) 1032 vput(tvp); 1033 1034 /* Release source nodes. */ 1035 vrele(fdvp); 1036 vrele(fvp); 1037 1038 if (mp != NULL) 1039 vfs_unbusy(mp); 1040 1041 return error; 1042} 1043 1044static int 1045tmpfs_mkdir(struct vop_mkdir_args *v) 1046{ 1047 struct vnode *dvp = v->a_dvp; 1048 struct vnode **vpp = v->a_vpp; 1049 struct componentname *cnp = v->a_cnp; 1050 struct vattr *vap = v->a_vap; 1051 1052 MPASS(vap->va_type == VDIR); 1053 1054 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1055} 1056 1057static int 1058tmpfs_rmdir(struct vop_rmdir_args *v) 1059{ 1060 struct vnode *dvp = v->a_dvp; 1061 struct vnode *vp = v->a_vp; 1062 1063 int error; 1064 struct tmpfs_dirent *de; 1065 struct tmpfs_mount *tmp; 1066 struct tmpfs_node *dnode; 1067 struct tmpfs_node *node; 1068 1069 MPASS(VOP_ISLOCKED(dvp)); 1070 MPASS(VOP_ISLOCKED(vp)); 1071 1072 tmp = VFS_TO_TMPFS(dvp->v_mount); 1073 dnode = VP_TO_TMPFS_DIR(dvp); 1074 node = VP_TO_TMPFS_DIR(vp); 1075 1076 /* Directories with more than two entries ('.' and '..') cannot be 1077 * removed. */ 1078 if (node->tn_size > 0) { 1079 error = ENOTEMPTY; 1080 goto out; 1081 } 1082 1083 if ((dnode->tn_flags & APPEND) 1084 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1085 error = EPERM; 1086 goto out; 1087 } 1088 1089 /* This invariant holds only if we are not trying to remove "..". 1090 * We checked for that above so this is safe now. */ 1091 MPASS(node->tn_dir.tn_parent == dnode); 1092 1093 /* Get the directory entry associated with node (vp). This was 1094 * filled by tmpfs_lookup while looking up the entry. */ 1095 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1096 MPASS(TMPFS_DIRENT_MATCHES(de, 1097 v->a_cnp->cn_nameptr, 1098 v->a_cnp->cn_namelen)); 1099 1100 /* Check flags to see if we are allowed to remove the directory. */ 1101 if ((dnode->tn_flags & APPEND) != 0 || 1102 (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) != 0) { 1103 error = EPERM; 1104 goto out; 1105 } 1106 1107 1108 /* Detach the directory entry from the directory (dnode). */ 1109 tmpfs_dir_detach(dvp, de); 1110 if (v->a_cnp->cn_flags & DOWHITEOUT) 1111 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1112 1113 /* No vnode should be allocated for this entry from this point */ 1114 TMPFS_NODE_LOCK(node); 1115 node->tn_links--; 1116 node->tn_dir.tn_parent = NULL; 1117 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1118 TMPFS_NODE_MODIFIED; 1119 1120 TMPFS_NODE_UNLOCK(node); 1121 1122 TMPFS_NODE_LOCK(dnode); 1123 dnode->tn_links--; 1124 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1125 TMPFS_NODE_MODIFIED; 1126 TMPFS_NODE_UNLOCK(dnode); 1127 1128 cache_purge(dvp); 1129 cache_purge(vp); 1130 1131 /* Free the directory entry we just deleted. Note that the node 1132 * referred by it will not be removed until the vnode is really 1133 * reclaimed. */ 1134 tmpfs_free_dirent(tmp, de); 1135 1136 /* Release the deleted vnode (will destroy the node, notify 1137 * interested parties and clean it from the cache). */ 1138 1139 dnode->tn_status |= TMPFS_NODE_CHANGED; 1140 tmpfs_update(dvp); 1141 1142 error = 0; 1143 1144out: 1145 return error; 1146} 1147 1148static int 1149tmpfs_symlink(struct vop_symlink_args *v) 1150{ 1151 struct vnode *dvp = v->a_dvp; 1152 struct vnode **vpp = v->a_vpp; 1153 struct componentname *cnp = v->a_cnp; 1154 struct vattr *vap = v->a_vap; 1155 char *target = v->a_target; 1156 1157#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1158 MPASS(vap->va_type == VLNK); 1159#else 1160 vap->va_type = VLNK; 1161#endif 1162 1163 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1164} 1165 1166static int 1167tmpfs_readdir(struct vop_readdir_args *v) 1168{ 1169 struct vnode *vp = v->a_vp; 1170 struct uio *uio = v->a_uio; 1171 int *eofflag = v->a_eofflag; 1172 u_long **cookies = v->a_cookies; 1173 int *ncookies = v->a_ncookies; 1174 1175 int error; 1176 ssize_t startresid; 1177 int maxcookies; 1178 struct tmpfs_node *node; 1179 1180 /* This operation only makes sense on directory nodes. */ 1181 if (vp->v_type != VDIR) 1182 return ENOTDIR; 1183 1184 maxcookies = 0; 1185 node = VP_TO_TMPFS_DIR(vp); 1186 1187 startresid = uio->uio_resid; 1188 1189 /* Allocate cookies for NFS and compat modules. */ 1190 if (cookies != NULL && ncookies != NULL) { 1191 maxcookies = howmany(node->tn_size, 1192 sizeof(struct tmpfs_dirent)) + 2; 1193 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1194 M_WAITOK); 1195 *ncookies = 0; 1196 } 1197 1198 if (cookies == NULL) 1199 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1200 else 1201 error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies, 1202 ncookies); 1203 1204 /* Buffer was filled without hitting EOF. */ 1205 if (error == EJUSTRETURN) 1206 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1207 1208 if (error != 0 && cookies != NULL && ncookies != NULL) { 1209 free(*cookies, M_TEMP); 1210 *cookies = NULL; 1211 *ncookies = 0; 1212 } 1213 1214 if (eofflag != NULL) 1215 *eofflag = 1216 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1217 1218 return error; 1219} 1220 1221static int 1222tmpfs_readlink(struct vop_readlink_args *v) 1223{ 1224 struct vnode *vp = v->a_vp; 1225 struct uio *uio = v->a_uio; 1226 1227 int error; 1228 struct tmpfs_node *node; 1229 1230 MPASS(uio->uio_offset == 0); 1231 MPASS(vp->v_type == VLNK); 1232 1233 node = VP_TO_TMPFS_NODE(vp); 1234 1235 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1236 uio); 1237 tmpfs_set_status(node, TMPFS_NODE_ACCESSED); 1238 1239 return (error); 1240} 1241 1242static int 1243tmpfs_inactive(struct vop_inactive_args *v) 1244{ 1245 struct vnode *vp; 1246 struct tmpfs_node *node; 1247 1248 vp = v->a_vp; 1249 node = VP_TO_TMPFS_NODE(vp); 1250 if (node->tn_links == 0) 1251 vrecycle(vp); 1252 else 1253 tmpfs_check_mtime(vp); 1254 return (0); 1255} 1256 1257int 1258tmpfs_reclaim(struct vop_reclaim_args *v) 1259{ 1260 struct vnode *vp = v->a_vp; 1261 1262 struct tmpfs_mount *tmp; 1263 struct tmpfs_node *node; 1264 1265 node = VP_TO_TMPFS_NODE(vp); 1266 tmp = VFS_TO_TMPFS(vp->v_mount); 1267 1268 if (vp->v_type == VREG) 1269 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1270 else 1271 vnode_destroy_vobject(vp); 1272 vp->v_object = NULL; 1273 cache_purge(vp); 1274 1275 TMPFS_NODE_LOCK(node); 1276 tmpfs_free_vp(vp); 1277 1278 /* If the node referenced by this vnode was deleted by the user, 1279 * we must free its associated data structures (now that the vnode 1280 * is being reclaimed). */ 1281 if (node->tn_links == 0 && 1282 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1283 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1284 TMPFS_NODE_UNLOCK(node); 1285 tmpfs_free_node(tmp, node); 1286 } else 1287 TMPFS_NODE_UNLOCK(node); 1288 1289 MPASS(vp->v_data == NULL); 1290 return 0; 1291} 1292 1293static int 1294tmpfs_print(struct vop_print_args *v) 1295{ 1296 struct vnode *vp = v->a_vp; 1297 1298 struct tmpfs_node *node; 1299 1300 node = VP_TO_TMPFS_NODE(vp); 1301 1302 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n", 1303 node, node->tn_flags, node->tn_links); 1304 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1305 node->tn_mode, node->tn_uid, node->tn_gid, 1306 (intmax_t)node->tn_size, node->tn_status); 1307 1308 if (vp->v_type == VFIFO) 1309 fifo_printinfo(vp); 1310 1311 printf("\n"); 1312 1313 return 0; 1314} 1315 1316static int 1317tmpfs_pathconf(struct vop_pathconf_args *v) 1318{ 1319 int name = v->a_name; 1320 register_t *retval = v->a_retval; 1321 1322 int error; 1323 1324 error = 0; 1325 1326 switch (name) { 1327 case _PC_LINK_MAX: 1328 *retval = LINK_MAX; 1329 break; 1330 1331 case _PC_NAME_MAX: 1332 *retval = NAME_MAX; 1333 break; 1334 1335 case _PC_PATH_MAX: 1336 *retval = PATH_MAX; 1337 break; 1338 1339 case _PC_PIPE_BUF: 1340 *retval = PIPE_BUF; 1341 break; 1342 1343 case _PC_CHOWN_RESTRICTED: 1344 *retval = 1; 1345 break; 1346 1347 case _PC_NO_TRUNC: 1348 *retval = 1; 1349 break; 1350 1351 case _PC_SYNC_IO: 1352 *retval = 1; 1353 break; 1354 1355 case _PC_FILESIZEBITS: 1356 *retval = 0; /* XXX Don't know which value should I return. */ 1357 break; 1358 1359 default: 1360 error = EINVAL; 1361 } 1362 1363 return error; 1364} 1365 1366static int 1367tmpfs_vptofh(struct vop_vptofh_args *ap) 1368{ 1369 struct tmpfs_fid *tfhp; 1370 struct tmpfs_node *node; 1371 1372 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1373 node = VP_TO_TMPFS_NODE(ap->a_vp); 1374 1375 tfhp->tf_len = sizeof(struct tmpfs_fid); 1376 tfhp->tf_id = node->tn_id; 1377 tfhp->tf_gen = node->tn_gen; 1378 1379 return (0); 1380} 1381 1382static int 1383tmpfs_whiteout(struct vop_whiteout_args *ap) 1384{ 1385 struct vnode *dvp = ap->a_dvp; 1386 struct componentname *cnp = ap->a_cnp; 1387 struct tmpfs_dirent *de; 1388 1389 switch (ap->a_flags) { 1390 case LOOKUP: 1391 return (0); 1392 case CREATE: 1393 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1394 if (de != NULL) 1395 return (de->td_node == NULL ? 0 : EEXIST); 1396 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1397 case DELETE: 1398 tmpfs_dir_whiteout_remove(dvp, cnp); 1399 return (0); 1400 default: 1401 panic("tmpfs_whiteout: unknown op"); 1402 } 1403} 1404 1405static int 1406tmpfs_vptocnp_dir(struct tmpfs_node *tn, struct tmpfs_node *tnp, 1407 struct tmpfs_dirent **pde) 1408{ 1409 struct tmpfs_dir_cursor dc; 1410 struct tmpfs_dirent *de; 1411 1412 for (de = tmpfs_dir_first(tnp, &dc); de != NULL; 1413 de = tmpfs_dir_next(tnp, &dc)) { 1414 if (de->td_node == tn) { 1415 *pde = de; 1416 return (0); 1417 } 1418 } 1419 return (ENOENT); 1420} 1421 1422static int 1423tmpfs_vptocnp_fill(struct vnode *vp, struct tmpfs_node *tn, 1424 struct tmpfs_node *tnp, char *buf, int *buflen, struct vnode **dvp) 1425{ 1426 struct tmpfs_dirent *de; 1427 int error, i; 1428 1429 error = vn_vget_ino_gen(vp, tmpfs_vn_get_ino_alloc, tnp, LK_SHARED, 1430 dvp); 1431 if (error != 0) 1432 return (error); 1433 error = tmpfs_vptocnp_dir(tn, tnp, &de); 1434 if (error == 0) { 1435 i = *buflen; 1436 i -= de->td_namelen; 1437 if (i < 0) { 1438 error = ENOMEM; 1439 } else { 1440 bcopy(de->ud.td_name, buf + i, de->td_namelen); 1441 *buflen = i; 1442 } 1443 } 1444 if (error == 0) { 1445 if (vp != *dvp) 1446 VOP_UNLOCK(*dvp, 0); 1447 } else { 1448 if (vp != *dvp) 1449 vput(*dvp); 1450 else 1451 vrele(vp); 1452 } 1453 return (error); 1454} 1455 1456static int 1457tmpfs_vptocnp(struct vop_vptocnp_args *ap) 1458{ 1459 struct vnode *vp, **dvp; 1460 struct tmpfs_node *tn, *tnp, *tnp1; 1461 struct tmpfs_dirent *de; 1462 struct tmpfs_mount *tm; 1463 char *buf; 1464 int *buflen; 1465 int error; 1466 1467 vp = ap->a_vp; 1468 dvp = ap->a_vpp; 1469 buf = ap->a_buf; 1470 buflen = ap->a_buflen; 1471 1472 tm = VFS_TO_TMPFS(vp->v_mount); 1473 tn = VP_TO_TMPFS_NODE(vp); 1474 if (tn->tn_type == VDIR) { 1475 tnp = tn->tn_dir.tn_parent; 1476 if (tnp == NULL) 1477 return (ENOENT); 1478 tmpfs_ref_node(tnp); 1479 error = tmpfs_vptocnp_fill(vp, tn, tn->tn_dir.tn_parent, buf, 1480 buflen, dvp); 1481 tmpfs_free_node(tm, tnp); 1482 return (error); 1483 } 1484restart: 1485 TMPFS_LOCK(tm); 1486 LIST_FOREACH_SAFE(tnp, &tm->tm_nodes_used, tn_entries, tnp1) { 1487 if (tnp->tn_type != VDIR) 1488 continue; 1489 TMPFS_NODE_LOCK(tnp); 1490 tmpfs_ref_node_locked(tnp); 1491 1492 /* 1493 * tn_vnode cannot be instantiated while we hold the 1494 * node lock, so the directory cannot be changed while 1495 * we iterate over it. Do this to avoid instantiating 1496 * vnode for directories which cannot point to our 1497 * node. 1498 */ 1499 error = tnp->tn_vnode == NULL ? tmpfs_vptocnp_dir(tn, tnp, 1500 &de) : 0; 1501 1502 if (error == 0) { 1503 TMPFS_NODE_UNLOCK(tnp); 1504 TMPFS_UNLOCK(tm); 1505 error = tmpfs_vptocnp_fill(vp, tn, tnp, buf, buflen, 1506 dvp); 1507 if (error == 0) { 1508 tmpfs_free_node(tm, tnp); 1509 return (0); 1510 } 1511 if ((vp->v_iflag & VI_DOOMED) != 0) { 1512 tmpfs_free_node(tm, tnp); 1513 return (ENOENT); 1514 } 1515 TMPFS_LOCK(tm); 1516 TMPFS_NODE_LOCK(tnp); 1517 } 1518 if (tmpfs_free_node_locked(tm, tnp, false)) { 1519 goto restart; 1520 } else { 1521 KASSERT(tnp->tn_refcount > 0, 1522 ("node %p refcount zero", tnp)); 1523 tnp1 = LIST_NEXT(tnp, tn_entries); 1524 TMPFS_NODE_UNLOCK(tnp); 1525 } 1526 } 1527 TMPFS_UNLOCK(tm); 1528 return (ENOENT); 1529} 1530 1531/* 1532 * Vnode operations vector used for files stored in a tmpfs file system. 1533 */ 1534struct vop_vector tmpfs_vnodeop_entries = { 1535 .vop_default = &default_vnodeops, 1536 .vop_lookup = vfs_cache_lookup, 1537 .vop_cachedlookup = tmpfs_lookup, 1538 .vop_create = tmpfs_create, 1539 .vop_mknod = tmpfs_mknod, 1540 .vop_open = tmpfs_open, 1541 .vop_close = tmpfs_close, 1542 .vop_access = tmpfs_access, 1543 .vop_getattr = tmpfs_getattr, 1544 .vop_setattr = tmpfs_setattr, 1545 .vop_read = tmpfs_read, 1546 .vop_write = tmpfs_write, 1547 .vop_fsync = tmpfs_fsync, 1548 .vop_remove = tmpfs_remove, 1549 .vop_link = tmpfs_link, 1550 .vop_rename = tmpfs_rename, 1551 .vop_mkdir = tmpfs_mkdir, 1552 .vop_rmdir = tmpfs_rmdir, 1553 .vop_symlink = tmpfs_symlink, 1554 .vop_readdir = tmpfs_readdir, 1555 .vop_readlink = tmpfs_readlink, 1556 .vop_inactive = tmpfs_inactive, 1557 .vop_reclaim = tmpfs_reclaim, 1558 .vop_print = tmpfs_print, 1559 .vop_pathconf = tmpfs_pathconf, 1560 .vop_vptofh = tmpfs_vptofh, 1561 .vop_whiteout = tmpfs_whiteout, 1562 .vop_bmap = VOP_EOPNOTSUPP, 1563 .vop_vptocnp = tmpfs_vptocnp, 1564}; 1565 1566