tmpfs_vnops.c revision 312803
143412Snewton/* $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $ */ 243412Snewton 343412Snewton/*- 443412Snewton * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. 552333Snewton * All rights reserved. 6302097Sbrooks * 743412Snewton * This code is derived from software contributed to The NetBSD Foundation 843412Snewton * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 943412Snewton * 2005 program. 1043412Snewton * 1143412Snewton * Redistribution and use in source and binary forms, with or without 1243412Snewton * modification, are permitted provided that the following conditions 1365302Sobrien * are met: 1465302Sobrien * 1. Redistributions of source code must retain the above copyright 1565302Sobrien * notice, this list of conditions and the following disclaimer. 1665302Sobrien * 2. Redistributions in binary form must reproduce the above copyright 1743412Snewton * notice, this list of conditions and the following disclaimer in the 1860290Sbde * documentation and/or other materials provided with the distribution. 1960290Sbde * 2043412Snewton * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 2143412Snewton * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22209581Skib * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23225618Skmacy * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24225618Skmacy * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25225618Skmacy * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26225618Skmacy * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27209581Skib * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28225618Skmacy * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29209581Skib * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30209581Skib * POSSIBILITY OF SUCH DAMAGE. 31225618Skmacy */ 32225618Skmacy 33209581Skib/* 34225618Skmacy * tmpfs vnode interface. 35209581Skib */ 36209581Skib#include <sys/cdefs.h> 37225618Skmacy__FBSDID("$FreeBSD: stable/10/sys/fs/tmpfs/tmpfs_vnops.c 312803 2017-01-26 10:49:45Z kib $"); 38225618Skmacy 39209581Skib#include <sys/param.h> 40209581Skib#include <sys/fcntl.h> 41225618Skmacy#include <sys/lockf.h> 42225618Skmacy#include <sys/lock.h> 43209581Skib#include <sys/namei.h> 44209581Skib#include <sys/priv.h> 45225618Skmacy#include <sys/proc.h> 46225618Skmacy#include <sys/rwlock.h> 47209581Skib#include <sys/sched.h> 48209581Skib#include <sys/stat.h> 49209581Skib#include <sys/systm.h> 50209581Skib#include <sys/sysctl.h> 51209581Skib#include <sys/unistd.h> 52209581Skib#include <sys/vnode.h> 53209581Skib 54209581Skib#include <vm/vm.h> 55209581Skib#include <vm/vm_param.h> 56209581Skib#include <vm/vm_object.h> 57209581Skib#include <vm/vm_page.h> 58225618Skmacy#include <vm/vm_pager.h> 59209581Skib 60209581Skib#include <fs/tmpfs/tmpfs_vnops.h> 61209581Skib#include <fs/tmpfs/tmpfs.h> 62209581Skib 63225618SkmacySYSCTL_DECL(_vfs_tmpfs); 64302097Sbrooks 65209581Skibstatic volatile int tmpfs_rename_restarts; 66209581SkibSYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD, 67209581Skib __DEVOLATILE(int *, &tmpfs_rename_restarts), 0, 68225618Skmacy "Times rename had to restart due to lock contention"); 69225618Skmacy 70209581Skibstatic int 71209581Skibtmpfs_vn_get_ino_alloc(struct mount *mp, void *arg, int lkflags, 72209581Skib struct vnode **rvp) 73209581Skib{ 74209581Skib 75209581Skib return (tmpfs_alloc_vp(mp, arg, lkflags, rvp)); 76209581Skib} 77209581Skib 78209581Skibstatic int 79209581Skibtmpfs_lookup(struct vop_cachedlookup_args *v) 80225618Skmacy{ 81209581Skib struct vnode *dvp = v->a_dvp; 82225618Skmacy struct vnode **vpp = v->a_vpp; 83225618Skmacy struct componentname *cnp = v->a_cnp; 84209581Skib struct tmpfs_dirent *de; 85209581Skib struct tmpfs_node *dnode; 86209581Skib int error; 87209581Skib 88209581Skib dnode = VP_TO_TMPFS_DIR(dvp); 89209581Skib *vpp = NULLVP; 90209581Skib 91209581Skib /* Check accessibility of requested node as a first step. */ 92209581Skib error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 93209581Skib if (error != 0) 94209581Skib goto out; 95209581Skib 96209581Skib /* We cannot be requesting the parent directory of the root node. */ 97209581Skib MPASS(IMPLIES(dnode->tn_type == VDIR && 98209581Skib dnode->tn_dir.tn_parent == dnode, 99209581Skib !(cnp->cn_flags & ISDOTDOT))); 100209581Skib 101225618Skmacy TMPFS_ASSERT_LOCKED(dnode); 102225618Skmacy if (dnode->tn_dir.tn_parent == NULL) { 103209581Skib error = ENOENT; 104209581Skib goto out; 105209581Skib } 106209581Skib if (cnp->cn_flags & ISDOTDOT) { 107209581Skib error = vn_vget_ino_gen(dvp, tmpfs_vn_get_ino_alloc, 108209581Skib dnode->tn_dir.tn_parent, cnp->cn_lkflags, vpp); 109209581Skib if (error != 0) 110209581Skib goto out; 111225618Skmacy } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 112225618Skmacy VREF(dvp); 113225618Skmacy *vpp = dvp; 114225618Skmacy error = 0; 115225618Skmacy } else { 116225618Skmacy de = tmpfs_dir_lookup(dnode, NULL, cnp); 117209581Skib if (de != NULL && de->td_node == NULL) 118209581Skib cnp->cn_flags |= ISWHITEOUT; 119209581Skib if (de == NULL || de->td_node == NULL) { 120209581Skib /* 121209581Skib * The entry was not found in the directory. 122209581Skib * This is OK if we are creating or renaming an 123209581Skib * entry and are working on the last component of 124209581Skib * the path name. 125209581Skib */ 126209581Skib if ((cnp->cn_flags & ISLASTCN) && 127209581Skib (cnp->cn_nameiop == CREATE || \ 128209581Skib cnp->cn_nameiop == RENAME || 129209581Skib (cnp->cn_nameiop == DELETE && 130209581Skib cnp->cn_flags & DOWHITEOUT && 131209581Skib cnp->cn_flags & ISWHITEOUT))) { 132209581Skib error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 133209581Skib cnp->cn_thread); 134209581Skib if (error != 0) 135209581Skib goto out; 136209581Skib 137209581Skib /* 138225618Skmacy * Keep the component name in the buffer for 139225618Skmacy * future uses. 140209581Skib */ 141225618Skmacy cnp->cn_flags |= SAVENAME; 142225618Skmacy 143225618Skmacy error = EJUSTRETURN; 144225618Skmacy } else 145209581Skib error = ENOENT; 146209581Skib } else { 147209581Skib struct tmpfs_node *tnode; 148209581Skib 149209581Skib /* 150209581Skib * The entry was found, so get its associated 151209581Skib * tmpfs_node. 152225618Skmacy */ 153209581Skib tnode = de->td_node; 154209581Skib 155209581Skib /* 156225618Skmacy * If we are not at the last path component and 157209581Skib * found a non-directory or non-link entry (which 158225618Skmacy * may itself be pointing to a directory), raise 159209581Skib * an error. 160225618Skmacy */ 161209581Skib if ((tnode->tn_type != VDIR && 162209581Skib tnode->tn_type != VLNK) && 163225618Skmacy !(cnp->cn_flags & ISLASTCN)) { 164209581Skib error = ENOTDIR; 165209581Skib goto out; 166209581Skib } 167209581Skib 168209581Skib /* 169209581Skib * If we are deleting or renaming the entry, keep 170209581Skib * track of its tmpfs_dirent so that it can be 171209581Skib * easily deleted later. 172209581Skib */ 173209581Skib if ((cnp->cn_flags & ISLASTCN) && 174209581Skib (cnp->cn_nameiop == DELETE || 175209581Skib cnp->cn_nameiop == RENAME)) { 176209581Skib error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 177209581Skib cnp->cn_thread); 178209581Skib if (error != 0) 179225618Skmacy goto out; 180225618Skmacy 181209581Skib /* Allocate a new vnode on the matching entry. */ 182209581Skib error = tmpfs_alloc_vp(dvp->v_mount, tnode, 183209581Skib cnp->cn_lkflags, vpp); 184209581Skib if (error != 0) 185209581Skib goto out; 186209581Skib 187209581Skib if ((dnode->tn_mode & S_ISTXT) && 188209581Skib VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, 189209581Skib cnp->cn_thread) && VOP_ACCESS(*vpp, VADMIN, 190209581Skib cnp->cn_cred, cnp->cn_thread)) { 191209581Skib error = EPERM; 192209581Skib vput(*vpp); 193209581Skib *vpp = NULL; 194209581Skib goto out; 195209581Skib } 196209581Skib cnp->cn_flags |= SAVENAME; 197209581Skib } else { 198209581Skib error = tmpfs_alloc_vp(dvp->v_mount, tnode, 199209581Skib cnp->cn_lkflags, vpp); 200209581Skib if (error != 0) 201209581Skib goto out; 202209581Skib } 203209581Skib } 204209581Skib } 205209581Skib 206209581Skib /* 207209581Skib * Store the result of this lookup in the cache. Avoid this if the 208209581Skib * request was for creation, as it does not improve timings on 209209581Skib * emprical tests. 210209581Skib */ 211209581Skib if ((cnp->cn_flags & MAKEENTRY) != 0) 212209581Skib cache_enter(dvp, *vpp, cnp); 213209581Skib 214209581Skibout: 215209581Skib /* 216209581Skib * If there were no errors, *vpp cannot be null and it must be 217209581Skib * locked. 218209581Skib */ 219209581Skib MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 220209581Skib 221225618Skmacy return (error); 222209581Skib} 223209581Skib 224225618Skmacystatic int 225225618Skmacytmpfs_create(struct vop_create_args *v) 226209581Skib{ 227209581Skib struct vnode *dvp = v->a_dvp; 228209581Skib struct vnode **vpp = v->a_vpp; 229209581Skib struct componentname *cnp = v->a_cnp; 230209581Skib struct vattr *vap = v->a_vap; 231209581Skib int error; 232209581Skib 233209581Skib MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 234209581Skib 235209581Skib error = tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 236209581Skib if (error == 0 && (cnp->cn_flags & MAKEENTRY) != 0) 237209581Skib cache_enter(dvp, *vpp, cnp); 238209581Skib return (error); 239209581Skib} 240209581Skib 241209581Skibstatic int 242209581Skibtmpfs_mknod(struct vop_mknod_args *v) 243209581Skib{ 244209581Skib struct vnode *dvp = v->a_dvp; 245209581Skib struct vnode **vpp = v->a_vpp; 246209581Skib struct componentname *cnp = v->a_cnp; 247209581Skib struct vattr *vap = v->a_vap; 248209581Skib 249209581Skib if (vap->va_type != VBLK && vap->va_type != VCHR && 250209581Skib vap->va_type != VFIFO) 251209581Skib return EINVAL; 252209581Skib 253225618Skmacy return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 254225618Skmacy} 255225618Skmacy 256225618Skmacystatic int 257225618Skmacytmpfs_open(struct vop_open_args *v) 258225618Skmacy{ 259209581Skib struct vnode *vp = v->a_vp; 260225618Skmacy int mode = v->a_mode; 261225618Skmacy 262209581Skib int error; 263225618Skmacy struct tmpfs_node *node; 264209581Skib 265225618Skmacy MPASS(VOP_ISLOCKED(vp)); 266225618Skmacy 267225618Skmacy node = VP_TO_TMPFS_NODE(vp); 268225618Skmacy 269209581Skib /* The file is still active but all its names have been removed 270209581Skib * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 271209581Skib * it is about to die. */ 27243412Snewton if (node->tn_links < 1) 273 return (ENOENT); 274 275 /* If the file is marked append-only, deny write requests. */ 276 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 277 error = EPERM; 278 else { 279 error = 0; 280 /* For regular files, the call below is nop. */ 281 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags & 282 OBJ_DEAD) == 0, ("dead object")); 283 vnode_create_vobject(vp, node->tn_size, v->a_td); 284 } 285 286 MPASS(VOP_ISLOCKED(vp)); 287 return error; 288} 289 290static int 291tmpfs_close(struct vop_close_args *v) 292{ 293 struct vnode *vp = v->a_vp; 294 295 /* Update node times. */ 296 tmpfs_update(vp); 297 298 return (0); 299} 300 301int 302tmpfs_access(struct vop_access_args *v) 303{ 304 struct vnode *vp = v->a_vp; 305 accmode_t accmode = v->a_accmode; 306 struct ucred *cred = v->a_cred; 307 308 int error; 309 struct tmpfs_node *node; 310 311 MPASS(VOP_ISLOCKED(vp)); 312 313 node = VP_TO_TMPFS_NODE(vp); 314 315 switch (vp->v_type) { 316 case VDIR: 317 /* FALLTHROUGH */ 318 case VLNK: 319 /* FALLTHROUGH */ 320 case VREG: 321 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 322 error = EROFS; 323 goto out; 324 } 325 break; 326 327 case VBLK: 328 /* FALLTHROUGH */ 329 case VCHR: 330 /* FALLTHROUGH */ 331 case VSOCK: 332 /* FALLTHROUGH */ 333 case VFIFO: 334 break; 335 336 default: 337 error = EINVAL; 338 goto out; 339 } 340 341 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 342 error = EPERM; 343 goto out; 344 } 345 346 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 347 node->tn_gid, accmode, cred, NULL); 348 349out: 350 MPASS(VOP_ISLOCKED(vp)); 351 352 return error; 353} 354 355int 356tmpfs_getattr(struct vop_getattr_args *v) 357{ 358 struct vnode *vp = v->a_vp; 359 struct vattr *vap = v->a_vap; 360 361 struct tmpfs_node *node; 362 363 node = VP_TO_TMPFS_NODE(vp); 364 365 tmpfs_update(vp); 366 367 vap->va_type = vp->v_type; 368 vap->va_mode = node->tn_mode; 369 vap->va_nlink = node->tn_links; 370 vap->va_uid = node->tn_uid; 371 vap->va_gid = node->tn_gid; 372 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 373 vap->va_fileid = node->tn_id; 374 vap->va_size = node->tn_size; 375 vap->va_blocksize = PAGE_SIZE; 376 vap->va_atime = node->tn_atime; 377 vap->va_mtime = node->tn_mtime; 378 vap->va_ctime = node->tn_ctime; 379 vap->va_birthtime = node->tn_birthtime; 380 vap->va_gen = node->tn_gen; 381 vap->va_flags = node->tn_flags; 382 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 383 node->tn_rdev : NODEV; 384 vap->va_bytes = round_page(node->tn_size); 385 vap->va_filerev = 0; 386 387 return 0; 388} 389 390int 391tmpfs_setattr(struct vop_setattr_args *v) 392{ 393 struct vnode *vp = v->a_vp; 394 struct vattr *vap = v->a_vap; 395 struct ucred *cred = v->a_cred; 396 struct thread *td = curthread; 397 398 int error; 399 400 MPASS(VOP_ISLOCKED(vp)); 401 402 error = 0; 403 404 /* Abort if any unsettable attribute is given. */ 405 if (vap->va_type != VNON || 406 vap->va_nlink != VNOVAL || 407 vap->va_fsid != VNOVAL || 408 vap->va_fileid != VNOVAL || 409 vap->va_blocksize != VNOVAL || 410 vap->va_gen != VNOVAL || 411 vap->va_rdev != VNOVAL || 412 vap->va_bytes != VNOVAL) 413 error = EINVAL; 414 415 if (error == 0 && (vap->va_flags != VNOVAL)) 416 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 417 418 if (error == 0 && (vap->va_size != VNOVAL)) 419 error = tmpfs_chsize(vp, vap->va_size, cred, td); 420 421 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 422 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 423 424 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 425 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 426 427 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 428 vap->va_atime.tv_nsec != VNOVAL) || 429 (vap->va_mtime.tv_sec != VNOVAL && 430 vap->va_mtime.tv_nsec != VNOVAL) || 431 (vap->va_birthtime.tv_sec != VNOVAL && 432 vap->va_birthtime.tv_nsec != VNOVAL))) 433 error = tmpfs_chtimes(vp, vap, cred, td); 434 435 /* Update the node times. We give preference to the error codes 436 * generated by this function rather than the ones that may arise 437 * from tmpfs_update. */ 438 tmpfs_update(vp); 439 440 MPASS(VOP_ISLOCKED(vp)); 441 442 return error; 443} 444 445static int 446tmpfs_read(struct vop_read_args *v) 447{ 448 struct vnode *vp; 449 struct uio *uio; 450 struct tmpfs_node *node; 451 452 vp = v->a_vp; 453 if (vp->v_type != VREG) 454 return (EISDIR); 455 uio = v->a_uio; 456 if (uio->uio_offset < 0) 457 return (EINVAL); 458 node = VP_TO_TMPFS_NODE(vp); 459 tmpfs_set_status(node, TMPFS_NODE_ACCESSED); 460 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio)); 461} 462 463static int 464tmpfs_write(struct vop_write_args *v) 465{ 466 struct vnode *vp; 467 struct uio *uio; 468 struct tmpfs_node *node; 469 off_t oldsize; 470 int error, ioflag; 471 472 vp = v->a_vp; 473 uio = v->a_uio; 474 ioflag = v->a_ioflag; 475 error = 0; 476 node = VP_TO_TMPFS_NODE(vp); 477 oldsize = node->tn_size; 478 479 if (uio->uio_offset < 0 || vp->v_type != VREG) 480 return (EINVAL); 481 if (uio->uio_resid == 0) 482 return (0); 483 if (ioflag & IO_APPEND) 484 uio->uio_offset = node->tn_size; 485 if (uio->uio_offset + uio->uio_resid > 486 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 487 return (EFBIG); 488 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 489 return (EFBIG); 490 if (uio->uio_offset + uio->uio_resid > node->tn_size) { 491 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 492 FALSE); 493 if (error != 0) 494 goto out; 495 } 496 497 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio); 498 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 499 TMPFS_NODE_CHANGED; 500 if (node->tn_mode & (S_ISUID | S_ISGID)) { 501 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 502 node->tn_mode &= ~(S_ISUID | S_ISGID); 503 } 504 if (error != 0) 505 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 506 507out: 508 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 509 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 510 511 return (error); 512} 513 514static int 515tmpfs_fsync(struct vop_fsync_args *v) 516{ 517 struct vnode *vp = v->a_vp; 518 519 MPASS(VOP_ISLOCKED(vp)); 520 521 tmpfs_check_mtime(vp); 522 tmpfs_update(vp); 523 524 return 0; 525} 526 527static int 528tmpfs_remove(struct vop_remove_args *v) 529{ 530 struct vnode *dvp = v->a_dvp; 531 struct vnode *vp = v->a_vp; 532 533 int error; 534 struct tmpfs_dirent *de; 535 struct tmpfs_mount *tmp; 536 struct tmpfs_node *dnode; 537 struct tmpfs_node *node; 538 539 MPASS(VOP_ISLOCKED(dvp)); 540 MPASS(VOP_ISLOCKED(vp)); 541 542 if (vp->v_type == VDIR) { 543 error = EISDIR; 544 goto out; 545 } 546 547 dnode = VP_TO_TMPFS_DIR(dvp); 548 node = VP_TO_TMPFS_NODE(vp); 549 tmp = VFS_TO_TMPFS(vp->v_mount); 550 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 551 MPASS(de != NULL); 552 553 /* Files marked as immutable or append-only cannot be deleted. */ 554 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 555 (dnode->tn_flags & APPEND)) { 556 error = EPERM; 557 goto out; 558 } 559 560 /* Remove the entry from the directory; as it is a file, we do not 561 * have to change the number of hard links of the directory. */ 562 tmpfs_dir_detach(dvp, de); 563 if (v->a_cnp->cn_flags & DOWHITEOUT) 564 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 565 566 /* Free the directory entry we just deleted. Note that the node 567 * referred by it will not be removed until the vnode is really 568 * reclaimed. */ 569 tmpfs_free_dirent(tmp, de); 570 571 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 572 error = 0; 573 574out: 575 576 return error; 577} 578 579static int 580tmpfs_link(struct vop_link_args *v) 581{ 582 struct vnode *dvp = v->a_tdvp; 583 struct vnode *vp = v->a_vp; 584 struct componentname *cnp = v->a_cnp; 585 586 int error; 587 struct tmpfs_dirent *de; 588 struct tmpfs_node *node; 589 590 MPASS(VOP_ISLOCKED(dvp)); 591 MPASS(cnp->cn_flags & HASBUF); 592 MPASS(dvp != vp); /* XXX When can this be false? */ 593 node = VP_TO_TMPFS_NODE(vp); 594 595 /* Ensure that we do not overflow the maximum number of links imposed 596 * by the system. */ 597 MPASS(node->tn_links <= LINK_MAX); 598 if (node->tn_links == LINK_MAX) { 599 error = EMLINK; 600 goto out; 601 } 602 603 /* We cannot create links of files marked immutable or append-only. */ 604 if (node->tn_flags & (IMMUTABLE | APPEND)) { 605 error = EPERM; 606 goto out; 607 } 608 609 /* Allocate a new directory entry to represent the node. */ 610 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 611 cnp->cn_nameptr, cnp->cn_namelen, &de); 612 if (error != 0) 613 goto out; 614 615 /* Insert the new directory entry into the appropriate directory. */ 616 if (cnp->cn_flags & ISWHITEOUT) 617 tmpfs_dir_whiteout_remove(dvp, cnp); 618 tmpfs_dir_attach(dvp, de); 619 620 /* vp link count has changed, so update node times. */ 621 node->tn_status |= TMPFS_NODE_CHANGED; 622 tmpfs_update(vp); 623 624 error = 0; 625 626out: 627 return error; 628} 629 630/* 631 * We acquire all but fdvp locks using non-blocking acquisitions. If we 632 * fail to acquire any lock in the path we will drop all held locks, 633 * acquire the new lock in a blocking fashion, and then release it and 634 * restart the rename. This acquire/release step ensures that we do not 635 * spin on a lock waiting for release. On error release all vnode locks 636 * and decrement references the way tmpfs_rename() would do. 637 */ 638static int 639tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 640 struct vnode *tdvp, struct vnode **tvpp, 641 struct componentname *fcnp, struct componentname *tcnp) 642{ 643 struct vnode *nvp; 644 struct mount *mp; 645 struct tmpfs_dirent *de; 646 int error, restarts = 0; 647 648 VOP_UNLOCK(tdvp, 0); 649 if (*tvpp != NULL && *tvpp != tdvp) 650 VOP_UNLOCK(*tvpp, 0); 651 mp = fdvp->v_mount; 652 653relock: 654 restarts += 1; 655 error = vn_lock(fdvp, LK_EXCLUSIVE); 656 if (error) 657 goto releout; 658 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 659 VOP_UNLOCK(fdvp, 0); 660 error = vn_lock(tdvp, LK_EXCLUSIVE); 661 if (error) 662 goto releout; 663 VOP_UNLOCK(tdvp, 0); 664 goto relock; 665 } 666 /* 667 * Re-resolve fvp to be certain it still exists and fetch the 668 * correct vnode. 669 */ 670 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 671 if (de == NULL) { 672 VOP_UNLOCK(fdvp, 0); 673 VOP_UNLOCK(tdvp, 0); 674 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 675 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 676 error = EINVAL; 677 else 678 error = ENOENT; 679 goto releout; 680 } 681 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 682 if (error != 0) { 683 VOP_UNLOCK(fdvp, 0); 684 VOP_UNLOCK(tdvp, 0); 685 if (error != EBUSY) 686 goto releout; 687 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 688 if (error != 0) 689 goto releout; 690 VOP_UNLOCK(nvp, 0); 691 /* 692 * Concurrent rename race. 693 */ 694 if (nvp == tdvp) { 695 vrele(nvp); 696 error = EINVAL; 697 goto releout; 698 } 699 vrele(*fvpp); 700 *fvpp = nvp; 701 goto relock; 702 } 703 vrele(*fvpp); 704 *fvpp = nvp; 705 VOP_UNLOCK(*fvpp, 0); 706 /* 707 * Re-resolve tvp and acquire the vnode lock if present. 708 */ 709 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 710 /* 711 * If tvp disappeared we just carry on. 712 */ 713 if (de == NULL && *tvpp != NULL) { 714 vrele(*tvpp); 715 *tvpp = NULL; 716 } 717 /* 718 * Get the tvp ino if the lookup succeeded. We may have to restart 719 * if the non-blocking acquire fails. 720 */ 721 if (de != NULL) { 722 nvp = NULL; 723 error = tmpfs_alloc_vp(mp, de->td_node, 724 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 725 if (*tvpp != NULL) 726 vrele(*tvpp); 727 *tvpp = nvp; 728 if (error != 0) { 729 VOP_UNLOCK(fdvp, 0); 730 VOP_UNLOCK(tdvp, 0); 731 if (error != EBUSY) 732 goto releout; 733 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 734 &nvp); 735 if (error != 0) 736 goto releout; 737 VOP_UNLOCK(nvp, 0); 738 /* 739 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 740 */ 741 if (nvp == fdvp) { 742 error = ENOTEMPTY; 743 goto releout; 744 } 745 goto relock; 746 } 747 } 748 tmpfs_rename_restarts += restarts; 749 750 return (0); 751 752releout: 753 vrele(fdvp); 754 vrele(*fvpp); 755 vrele(tdvp); 756 if (*tvpp != NULL) 757 vrele(*tvpp); 758 tmpfs_rename_restarts += restarts; 759 760 return (error); 761} 762 763static int 764tmpfs_rename(struct vop_rename_args *v) 765{ 766 struct vnode *fdvp = v->a_fdvp; 767 struct vnode *fvp = v->a_fvp; 768 struct componentname *fcnp = v->a_fcnp; 769 struct vnode *tdvp = v->a_tdvp; 770 struct vnode *tvp = v->a_tvp; 771 struct componentname *tcnp = v->a_tcnp; 772 struct mount *mp = NULL; 773 774 char *newname; 775 int error; 776 struct tmpfs_dirent *de; 777 struct tmpfs_mount *tmp; 778 struct tmpfs_node *fdnode; 779 struct tmpfs_node *fnode; 780 struct tmpfs_node *tnode; 781 struct tmpfs_node *tdnode; 782 783 MPASS(VOP_ISLOCKED(tdvp)); 784 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 785 MPASS(fcnp->cn_flags & HASBUF); 786 MPASS(tcnp->cn_flags & HASBUF); 787 788 /* Disallow cross-device renames. 789 * XXX Why isn't this done by the caller? */ 790 if (fvp->v_mount != tdvp->v_mount || 791 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 792 error = EXDEV; 793 goto out; 794 } 795 796 /* If source and target are the same file, there is nothing to do. */ 797 if (fvp == tvp) { 798 error = 0; 799 goto out; 800 } 801 802 /* If we need to move the directory between entries, lock the 803 * source so that we can safely operate on it. */ 804 if (fdvp != tdvp && fdvp != tvp) { 805 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 806 mp = tdvp->v_mount; 807 error = vfs_busy(mp, 0); 808 if (error != 0) { 809 mp = NULL; 810 goto out; 811 } 812 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 813 fcnp, tcnp); 814 if (error != 0) { 815 vfs_unbusy(mp); 816 return (error); 817 } 818 ASSERT_VOP_ELOCKED(fdvp, 819 "tmpfs_rename: fdvp not locked"); 820 ASSERT_VOP_ELOCKED(tdvp, 821 "tmpfs_rename: tdvp not locked"); 822 if (tvp != NULL) 823 ASSERT_VOP_ELOCKED(tvp, 824 "tmpfs_rename: tvp not locked"); 825 if (fvp == tvp) { 826 error = 0; 827 goto out_locked; 828 } 829 } 830 } 831 832 tmp = VFS_TO_TMPFS(tdvp->v_mount); 833 tdnode = VP_TO_TMPFS_DIR(tdvp); 834 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 835 fdnode = VP_TO_TMPFS_DIR(fdvp); 836 fnode = VP_TO_TMPFS_NODE(fvp); 837 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 838 839 /* Entry can disappear before we lock fdvp, 840 * also avoid manipulating '.' and '..' entries. */ 841 if (de == NULL) { 842 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 843 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 844 error = EINVAL; 845 else 846 error = ENOENT; 847 goto out_locked; 848 } 849 MPASS(de->td_node == fnode); 850 851 /* If re-naming a directory to another preexisting directory 852 * ensure that the target directory is empty so that its 853 * removal causes no side effects. 854 * Kern_rename gurantees the destination to be a directory 855 * if the source is one. */ 856 if (tvp != NULL) { 857 MPASS(tnode != NULL); 858 859 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 860 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 861 error = EPERM; 862 goto out_locked; 863 } 864 865 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 866 if (tnode->tn_size > 0) { 867 error = ENOTEMPTY; 868 goto out_locked; 869 } 870 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 871 error = ENOTDIR; 872 goto out_locked; 873 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 874 error = EISDIR; 875 goto out_locked; 876 } else { 877 MPASS(fnode->tn_type != VDIR && 878 tnode->tn_type != VDIR); 879 } 880 } 881 882 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 883 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 884 error = EPERM; 885 goto out_locked; 886 } 887 888 /* Ensure that we have enough memory to hold the new name, if it 889 * has to be changed. */ 890 if (fcnp->cn_namelen != tcnp->cn_namelen || 891 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 892 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 893 } else 894 newname = NULL; 895 896 /* If the node is being moved to another directory, we have to do 897 * the move. */ 898 if (fdnode != tdnode) { 899 /* In case we are moving a directory, we have to adjust its 900 * parent to point to the new parent. */ 901 if (de->td_node->tn_type == VDIR) { 902 struct tmpfs_node *n; 903 904 /* Ensure the target directory is not a child of the 905 * directory being moved. Otherwise, we'd end up 906 * with stale nodes. */ 907 n = tdnode; 908 /* TMPFS_LOCK garanties that no nodes are freed while 909 * traversing the list. Nodes can only be marked as 910 * removed: tn_parent == NULL. */ 911 TMPFS_LOCK(tmp); 912 TMPFS_NODE_LOCK(n); 913 while (n != n->tn_dir.tn_parent) { 914 struct tmpfs_node *parent; 915 916 if (n == fnode) { 917 TMPFS_NODE_UNLOCK(n); 918 TMPFS_UNLOCK(tmp); 919 error = EINVAL; 920 if (newname != NULL) 921 free(newname, M_TMPFSNAME); 922 goto out_locked; 923 } 924 parent = n->tn_dir.tn_parent; 925 TMPFS_NODE_UNLOCK(n); 926 if (parent == NULL) { 927 n = NULL; 928 break; 929 } 930 TMPFS_NODE_LOCK(parent); 931 if (parent->tn_dir.tn_parent == NULL) { 932 TMPFS_NODE_UNLOCK(parent); 933 n = NULL; 934 break; 935 } 936 n = parent; 937 } 938 TMPFS_UNLOCK(tmp); 939 if (n == NULL) { 940 error = EINVAL; 941 if (newname != NULL) 942 free(newname, M_TMPFSNAME); 943 goto out_locked; 944 } 945 TMPFS_NODE_UNLOCK(n); 946 947 /* Adjust the parent pointer. */ 948 TMPFS_VALIDATE_DIR(fnode); 949 TMPFS_NODE_LOCK(de->td_node); 950 de->td_node->tn_dir.tn_parent = tdnode; 951 TMPFS_NODE_UNLOCK(de->td_node); 952 953 /* As a result of changing the target of the '..' 954 * entry, the link count of the source and target 955 * directories has to be adjusted. */ 956 TMPFS_NODE_LOCK(tdnode); 957 TMPFS_ASSERT_LOCKED(tdnode); 958 tdnode->tn_links++; 959 TMPFS_NODE_UNLOCK(tdnode); 960 961 TMPFS_NODE_LOCK(fdnode); 962 TMPFS_ASSERT_LOCKED(fdnode); 963 fdnode->tn_links--; 964 TMPFS_NODE_UNLOCK(fdnode); 965 } 966 } 967 968 /* Do the move: just remove the entry from the source directory 969 * and insert it into the target one. */ 970 tmpfs_dir_detach(fdvp, de); 971 972 if (fcnp->cn_flags & DOWHITEOUT) 973 tmpfs_dir_whiteout_add(fdvp, fcnp); 974 if (tcnp->cn_flags & ISWHITEOUT) 975 tmpfs_dir_whiteout_remove(tdvp, tcnp); 976 977 /* If the name has changed, we need to make it effective by changing 978 * it in the directory entry. */ 979 if (newname != NULL) { 980 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 981 982 free(de->ud.td_name, M_TMPFSNAME); 983 de->ud.td_name = newname; 984 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 985 986 fnode->tn_status |= TMPFS_NODE_CHANGED; 987 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 988 } 989 990 /* If we are overwriting an entry, we have to remove the old one 991 * from the target directory. */ 992 if (tvp != NULL) { 993 struct tmpfs_dirent *tde; 994 995 /* Remove the old entry from the target directory. */ 996 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 997 tmpfs_dir_detach(tdvp, tde); 998 999 /* Free the directory entry we just deleted. Note that the 1000 * node referred by it will not be removed until the vnode is 1001 * really reclaimed. */ 1002 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1003 } 1004 1005 tmpfs_dir_attach(tdvp, de); 1006 1007 cache_purge(fvp); 1008 if (tvp != NULL) 1009 cache_purge(tvp); 1010 cache_purge_negative(tdvp); 1011 1012 error = 0; 1013 1014out_locked: 1015 if (fdvp != tdvp && fdvp != tvp) 1016 VOP_UNLOCK(fdvp, 0); 1017 1018out: 1019 /* Release target nodes. */ 1020 /* XXX: I don't understand when tdvp can be the same as tvp, but 1021 * other code takes care of this... */ 1022 if (tdvp == tvp) 1023 vrele(tdvp); 1024 else 1025 vput(tdvp); 1026 if (tvp != NULL) 1027 vput(tvp); 1028 1029 /* Release source nodes. */ 1030 vrele(fdvp); 1031 vrele(fvp); 1032 1033 if (mp != NULL) 1034 vfs_unbusy(mp); 1035 1036 return error; 1037} 1038 1039static int 1040tmpfs_mkdir(struct vop_mkdir_args *v) 1041{ 1042 struct vnode *dvp = v->a_dvp; 1043 struct vnode **vpp = v->a_vpp; 1044 struct componentname *cnp = v->a_cnp; 1045 struct vattr *vap = v->a_vap; 1046 1047 MPASS(vap->va_type == VDIR); 1048 1049 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1050} 1051 1052static int 1053tmpfs_rmdir(struct vop_rmdir_args *v) 1054{ 1055 struct vnode *dvp = v->a_dvp; 1056 struct vnode *vp = v->a_vp; 1057 1058 int error; 1059 struct tmpfs_dirent *de; 1060 struct tmpfs_mount *tmp; 1061 struct tmpfs_node *dnode; 1062 struct tmpfs_node *node; 1063 1064 MPASS(VOP_ISLOCKED(dvp)); 1065 MPASS(VOP_ISLOCKED(vp)); 1066 1067 tmp = VFS_TO_TMPFS(dvp->v_mount); 1068 dnode = VP_TO_TMPFS_DIR(dvp); 1069 node = VP_TO_TMPFS_DIR(vp); 1070 1071 /* Directories with more than two entries ('.' and '..') cannot be 1072 * removed. */ 1073 if (node->tn_size > 0) { 1074 error = ENOTEMPTY; 1075 goto out; 1076 } 1077 1078 if ((dnode->tn_flags & APPEND) 1079 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1080 error = EPERM; 1081 goto out; 1082 } 1083 1084 /* This invariant holds only if we are not trying to remove "..". 1085 * We checked for that above so this is safe now. */ 1086 MPASS(node->tn_dir.tn_parent == dnode); 1087 1088 /* Get the directory entry associated with node (vp). This was 1089 * filled by tmpfs_lookup while looking up the entry. */ 1090 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1091 MPASS(TMPFS_DIRENT_MATCHES(de, 1092 v->a_cnp->cn_nameptr, 1093 v->a_cnp->cn_namelen)); 1094 1095 /* Check flags to see if we are allowed to remove the directory. */ 1096 if ((dnode->tn_flags & APPEND) != 0 || 1097 (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) != 0) { 1098 error = EPERM; 1099 goto out; 1100 } 1101 1102 1103 /* Detach the directory entry from the directory (dnode). */ 1104 tmpfs_dir_detach(dvp, de); 1105 if (v->a_cnp->cn_flags & DOWHITEOUT) 1106 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1107 1108 /* No vnode should be allocated for this entry from this point */ 1109 TMPFS_NODE_LOCK(node); 1110 TMPFS_ASSERT_ELOCKED(node); 1111 node->tn_links--; 1112 node->tn_dir.tn_parent = NULL; 1113 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1114 TMPFS_NODE_MODIFIED; 1115 1116 TMPFS_NODE_UNLOCK(node); 1117 1118 TMPFS_NODE_LOCK(dnode); 1119 TMPFS_ASSERT_ELOCKED(dnode); 1120 dnode->tn_links--; 1121 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1122 TMPFS_NODE_MODIFIED; 1123 TMPFS_NODE_UNLOCK(dnode); 1124 1125 cache_purge(dvp); 1126 cache_purge(vp); 1127 1128 /* Free the directory entry we just deleted. Note that the node 1129 * referred by it will not be removed until the vnode is really 1130 * reclaimed. */ 1131 tmpfs_free_dirent(tmp, de); 1132 1133 /* Release the deleted vnode (will destroy the node, notify 1134 * interested parties and clean it from the cache). */ 1135 1136 dnode->tn_status |= TMPFS_NODE_CHANGED; 1137 tmpfs_update(dvp); 1138 1139 error = 0; 1140 1141out: 1142 return error; 1143} 1144 1145static int 1146tmpfs_symlink(struct vop_symlink_args *v) 1147{ 1148 struct vnode *dvp = v->a_dvp; 1149 struct vnode **vpp = v->a_vpp; 1150 struct componentname *cnp = v->a_cnp; 1151 struct vattr *vap = v->a_vap; 1152 char *target = v->a_target; 1153 1154#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1155 MPASS(vap->va_type == VLNK); 1156#else 1157 vap->va_type = VLNK; 1158#endif 1159 1160 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1161} 1162 1163static int 1164tmpfs_readdir(struct vop_readdir_args *v) 1165{ 1166 struct vnode *vp = v->a_vp; 1167 struct uio *uio = v->a_uio; 1168 int *eofflag = v->a_eofflag; 1169 u_long **cookies = v->a_cookies; 1170 int *ncookies = v->a_ncookies; 1171 1172 int error; 1173 ssize_t startresid; 1174 int maxcookies; 1175 struct tmpfs_node *node; 1176 1177 /* This operation only makes sense on directory nodes. */ 1178 if (vp->v_type != VDIR) 1179 return ENOTDIR; 1180 1181 maxcookies = 0; 1182 node = VP_TO_TMPFS_DIR(vp); 1183 1184 startresid = uio->uio_resid; 1185 1186 /* Allocate cookies for NFS and compat modules. */ 1187 if (cookies != NULL && ncookies != NULL) { 1188 maxcookies = howmany(node->tn_size, 1189 sizeof(struct tmpfs_dirent)) + 2; 1190 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1191 M_WAITOK); 1192 *ncookies = 0; 1193 } 1194 1195 if (cookies == NULL) 1196 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1197 else 1198 error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies, 1199 ncookies); 1200 1201 /* Buffer was filled without hitting EOF. */ 1202 if (error == EJUSTRETURN) 1203 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1204 1205 if (error != 0 && cookies != NULL && ncookies != NULL) { 1206 free(*cookies, M_TEMP); 1207 *cookies = NULL; 1208 *ncookies = 0; 1209 } 1210 1211 if (eofflag != NULL) 1212 *eofflag = 1213 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1214 1215 return error; 1216} 1217 1218static int 1219tmpfs_readlink(struct vop_readlink_args *v) 1220{ 1221 struct vnode *vp = v->a_vp; 1222 struct uio *uio = v->a_uio; 1223 1224 int error; 1225 struct tmpfs_node *node; 1226 1227 MPASS(uio->uio_offset == 0); 1228 MPASS(vp->v_type == VLNK); 1229 1230 node = VP_TO_TMPFS_NODE(vp); 1231 1232 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1233 uio); 1234 tmpfs_set_status(node, TMPFS_NODE_ACCESSED); 1235 1236 return (error); 1237} 1238 1239static int 1240tmpfs_inactive(struct vop_inactive_args *v) 1241{ 1242 struct vnode *vp; 1243 struct tmpfs_node *node; 1244 1245 vp = v->a_vp; 1246 node = VP_TO_TMPFS_NODE(vp); 1247 if (node->tn_links == 0) 1248 vrecycle(vp); 1249 else 1250 tmpfs_check_mtime(vp); 1251 return (0); 1252} 1253 1254int 1255tmpfs_reclaim(struct vop_reclaim_args *v) 1256{ 1257 struct vnode *vp = v->a_vp; 1258 1259 struct tmpfs_mount *tmp; 1260 struct tmpfs_node *node; 1261 1262 node = VP_TO_TMPFS_NODE(vp); 1263 tmp = VFS_TO_TMPFS(vp->v_mount); 1264 1265 if (vp->v_type == VREG) 1266 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1267 else 1268 vnode_destroy_vobject(vp); 1269 vp->v_object = NULL; 1270 cache_purge(vp); 1271 1272 TMPFS_NODE_LOCK(node); 1273 TMPFS_ASSERT_ELOCKED(node); 1274 tmpfs_free_vp(vp); 1275 1276 /* If the node referenced by this vnode was deleted by the user, 1277 * we must free its associated data structures (now that the vnode 1278 * is being reclaimed). */ 1279 if (node->tn_links == 0 && 1280 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1281 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1282 TMPFS_NODE_UNLOCK(node); 1283 tmpfs_free_node(tmp, node); 1284 } else 1285 TMPFS_NODE_UNLOCK(node); 1286 1287 MPASS(vp->v_data == NULL); 1288 return 0; 1289} 1290 1291static int 1292tmpfs_print(struct vop_print_args *v) 1293{ 1294 struct vnode *vp = v->a_vp; 1295 1296 struct tmpfs_node *node; 1297 1298 node = VP_TO_TMPFS_NODE(vp); 1299 1300 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n", 1301 node, node->tn_flags, node->tn_links); 1302 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1303 node->tn_mode, node->tn_uid, node->tn_gid, 1304 (intmax_t)node->tn_size, node->tn_status); 1305 1306 if (vp->v_type == VFIFO) 1307 fifo_printinfo(vp); 1308 1309 printf("\n"); 1310 1311 return 0; 1312} 1313 1314static int 1315tmpfs_pathconf(struct vop_pathconf_args *v) 1316{ 1317 int name = v->a_name; 1318 register_t *retval = v->a_retval; 1319 1320 int error; 1321 1322 error = 0; 1323 1324 switch (name) { 1325 case _PC_LINK_MAX: 1326 *retval = LINK_MAX; 1327 break; 1328 1329 case _PC_NAME_MAX: 1330 *retval = NAME_MAX; 1331 break; 1332 1333 case _PC_PATH_MAX: 1334 *retval = PATH_MAX; 1335 break; 1336 1337 case _PC_PIPE_BUF: 1338 *retval = PIPE_BUF; 1339 break; 1340 1341 case _PC_CHOWN_RESTRICTED: 1342 *retval = 1; 1343 break; 1344 1345 case _PC_NO_TRUNC: 1346 *retval = 1; 1347 break; 1348 1349 case _PC_SYNC_IO: 1350 *retval = 1; 1351 break; 1352 1353 case _PC_FILESIZEBITS: 1354 *retval = 0; /* XXX Don't know which value should I return. */ 1355 break; 1356 1357 default: 1358 error = EINVAL; 1359 } 1360 1361 return error; 1362} 1363 1364static int 1365tmpfs_vptofh(struct vop_vptofh_args *ap) 1366{ 1367 struct tmpfs_fid *tfhp; 1368 struct tmpfs_node *node; 1369 1370 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1371 node = VP_TO_TMPFS_NODE(ap->a_vp); 1372 1373 tfhp->tf_len = sizeof(struct tmpfs_fid); 1374 tfhp->tf_id = node->tn_id; 1375 tfhp->tf_gen = node->tn_gen; 1376 1377 return (0); 1378} 1379 1380static int 1381tmpfs_whiteout(struct vop_whiteout_args *ap) 1382{ 1383 struct vnode *dvp = ap->a_dvp; 1384 struct componentname *cnp = ap->a_cnp; 1385 struct tmpfs_dirent *de; 1386 1387 switch (ap->a_flags) { 1388 case LOOKUP: 1389 return (0); 1390 case CREATE: 1391 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1392 if (de != NULL) 1393 return (de->td_node == NULL ? 0 : EEXIST); 1394 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1395 case DELETE: 1396 tmpfs_dir_whiteout_remove(dvp, cnp); 1397 return (0); 1398 default: 1399 panic("tmpfs_whiteout: unknown op"); 1400 } 1401} 1402 1403/* 1404 * Vnode operations vector used for files stored in a tmpfs file system. 1405 */ 1406struct vop_vector tmpfs_vnodeop_entries = { 1407 .vop_default = &default_vnodeops, 1408 .vop_lookup = vfs_cache_lookup, 1409 .vop_cachedlookup = tmpfs_lookup, 1410 .vop_create = tmpfs_create, 1411 .vop_mknod = tmpfs_mknod, 1412 .vop_open = tmpfs_open, 1413 .vop_close = tmpfs_close, 1414 .vop_access = tmpfs_access, 1415 .vop_getattr = tmpfs_getattr, 1416 .vop_setattr = tmpfs_setattr, 1417 .vop_read = tmpfs_read, 1418 .vop_write = tmpfs_write, 1419 .vop_fsync = tmpfs_fsync, 1420 .vop_remove = tmpfs_remove, 1421 .vop_link = tmpfs_link, 1422 .vop_rename = tmpfs_rename, 1423 .vop_mkdir = tmpfs_mkdir, 1424 .vop_rmdir = tmpfs_rmdir, 1425 .vop_symlink = tmpfs_symlink, 1426 .vop_readdir = tmpfs_readdir, 1427 .vop_readlink = tmpfs_readlink, 1428 .vop_inactive = tmpfs_inactive, 1429 .vop_reclaim = tmpfs_reclaim, 1430 .vop_print = tmpfs_print, 1431 .vop_pathconf = tmpfs_pathconf, 1432 .vop_vptofh = tmpfs_vptofh, 1433 .vop_whiteout = tmpfs_whiteout, 1434 .vop_bmap = VOP_EOPNOTSUPP, 1435}; 1436 1437