tmpfs_vnops.c revision 267816
1168404Spjd/* $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $ */ 2168404Spjd 3168404Spjd/*- 4168404Spjd * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. 5168404Spjd * All rights reserved. 6168404Spjd * 7168404Spjd * This code is derived from software contributed to The NetBSD Foundation 8168404Spjd * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 9168404Spjd * 2005 program. 10168404Spjd * 11168404Spjd * Redistribution and use in source and binary forms, with or without 12168404Spjd * modification, are permitted provided that the following conditions 13168404Spjd * are met: 14168404Spjd * 1. Redistributions of source code must retain the above copyright 15168404Spjd * notice, this list of conditions and the following disclaimer. 16168404Spjd * 2. Redistributions in binary form must reproduce the above copyright 17168404Spjd * notice, this list of conditions and the following disclaimer in the 18168404Spjd * documentation and/or other materials provided with the distribution. 19168404Spjd * 20168404Spjd * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21168404Spjd * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22168404Spjd * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23168404Spjd * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24168404Spjd * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25168404Spjd * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26168404Spjd * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27168404Spjd * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28168404Spjd * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29168404Spjd * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30168404Spjd * POSSIBILITY OF SUCH DAMAGE. 31168404Spjd */ 32168404Spjd 33185029Spjd/* 34168404Spjd * tmpfs vnode interface. 35168404Spjd */ 36168404Spjd#include <sys/cdefs.h> 37168404Spjd__FBSDID("$FreeBSD: stable/10/sys/fs/tmpfs/tmpfs_vnops.c 267816 2014-06-24 08:21:43Z kib $"); 38168404Spjd 39168404Spjd#include <sys/param.h> 40168404Spjd#include <sys/fcntl.h> 41168404Spjd#include <sys/lockf.h> 42168404Spjd#include <sys/lock.h> 43168404Spjd#include <sys/namei.h> 44168404Spjd#include <sys/priv.h> 45168404Spjd#include <sys/proc.h> 46168404Spjd#include <sys/rwlock.h> 47168404Spjd#include <sys/sched.h> 48196943Spjd#include <sys/sf_buf.h> 49168404Spjd#include <sys/stat.h> 50196943Spjd#include <sys/systm.h> 51196943Spjd#include <sys/sysctl.h> 52196943Spjd#include <sys/unistd.h> 53168404Spjd#include <sys/vnode.h> 54196943Spjd 55196943Spjd#include <vm/vm.h> 56196943Spjd#include <vm/vm_param.h> 57196943Spjd#include <vm/vm_object.h> 58196943Spjd#include <vm/vm_page.h> 59196943Spjd#include <vm/vm_pager.h> 60196943Spjd 61196943Spjd#include <fs/tmpfs/tmpfs_vnops.h> 62196943Spjd#include <fs/tmpfs/tmpfs.h> 63196943Spjd 64196943SpjdSYSCTL_DECL(_vfs_tmpfs); 65168404Spjd 66168404Spjdstatic volatile int tmpfs_rename_restarts; 67196943SpjdSYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD, 68196943Spjd __DEVOLATILE(int *, &tmpfs_rename_restarts), 0, 69168404Spjd "Times rename had to restart due to lock contention"); 70168404Spjd 71168404Spjd/* --------------------------------------------------------------------- */ 72168404Spjd 73189290Sjamiestatic int 74189290Sjamietmpfs_lookup(struct vop_cachedlookup_args *v) 75168404Spjd{ 76168404Spjd struct vnode *dvp = v->a_dvp; 77168404Spjd struct vnode **vpp = v->a_vpp; 78168404Spjd struct componentname *cnp = v->a_cnp; 79168404Spjd 80168404Spjd int error; 81168404Spjd struct tmpfs_dirent *de; 82168404Spjd struct tmpfs_node *dnode; 83196943Spjd 84196943Spjd dnode = VP_TO_TMPFS_DIR(dvp); 85168404Spjd *vpp = NULLVP; 86196943Spjd 87196943Spjd /* Check accessibility of requested node as a first step. */ 88168404Spjd error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 89168404Spjd if (error != 0) 90168404Spjd goto out; 91168404Spjd 92168404Spjd /* We cannot be requesting the parent directory of the root node. */ 93196943Spjd MPASS(IMPLIES(dnode->tn_type == VDIR && 94168404Spjd dnode->tn_dir.tn_parent == dnode, 95196943Spjd !(cnp->cn_flags & ISDOTDOT))); 96196943Spjd 97189290Sjamie TMPFS_ASSERT_LOCKED(dnode); 98196943Spjd if (dnode->tn_dir.tn_parent == NULL) { 99196943Spjd error = ENOENT; 100168404Spjd goto out; 101168404Spjd } 102168404Spjd if (cnp->cn_flags & ISDOTDOT) { 103168404Spjd int ltype = 0; 104168404Spjd 105180652Spjd ltype = VOP_ISLOCKED(dvp); 106168404Spjd vhold(dvp); 107168404Spjd VOP_UNLOCK(dvp, 0); 108168404Spjd /* Allocate a new vnode on the matching entry. */ 109168404Spjd error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent, 110168404Spjd cnp->cn_lkflags, vpp); 111168404Spjd 112168404Spjd vn_lock(dvp, ltype | LK_RETRY); 113168404Spjd vdrop(dvp); 114168404Spjd } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 115197201Spjd VREF(dvp); 116168404Spjd *vpp = dvp; 117168404Spjd error = 0; 118219089Spjd } else { 119168404Spjd de = tmpfs_dir_lookup(dnode, NULL, cnp); 120219089Spjd if (de != NULL && de->td_node == NULL) 121185029Spjd cnp->cn_flags |= ISWHITEOUT; 122168404Spjd if (de == NULL || de->td_node == NULL) { 123168404Spjd /* The entry was not found in the directory. 124302735Savg * This is OK if we are creating or renaming an 125302735Savg * entry and are working on the last component of 126302735Savg * the path name. */ 127302735Savg if ((cnp->cn_flags & ISLASTCN) && 128302735Savg (cnp->cn_nameiop == CREATE || \ 129302735Savg cnp->cn_nameiop == RENAME || 130168404Spjd (cnp->cn_nameiop == DELETE && 131168404Spjd cnp->cn_flags & DOWHITEOUT && 132168404Spjd cnp->cn_flags & ISWHITEOUT))) { 133168404Spjd error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 134168404Spjd cnp->cn_thread); 135168404Spjd if (error != 0) 136302735Savg goto out; 137302735Savg 138302735Savg /* Keep the component name in the buffer for 139302735Savg * future uses. */ 140302735Savg cnp->cn_flags |= SAVENAME; 141197201Spjd 142197201Spjd error = EJUSTRETURN; 143197201Spjd } else 144197201Spjd error = ENOENT; 145302735Savg } else { 146302735Savg struct tmpfs_node *tnode; 147302735Savg 148302735Savg /* The entry was found, so get its associated 149302735Savg * tmpfs_node. */ 150302735Savg tnode = de->td_node; 151168404Spjd 152168404Spjd /* If we are not at the last path component and 153302735Savg * found a non-directory or non-link entry (which 154302735Savg * may itself be pointing to a directory), raise 155302735Savg * an error. */ 156302735Savg if ((tnode->tn_type != VDIR && 157197201Spjd tnode->tn_type != VLNK) && 158168404Spjd !(cnp->cn_flags & ISLASTCN)) { 159168404Spjd error = ENOTDIR; 160168404Spjd goto out; 161219089Spjd } 162219089Spjd 163168404Spjd /* If we are deleting or renaming the entry, keep 164219089Spjd * track of its tmpfs_dirent so that it can be 165168404Spjd * easily deleted later. */ 166168404Spjd if ((cnp->cn_flags & ISLASTCN) && 167168404Spjd (cnp->cn_nameiop == DELETE || 168168404Spjd cnp->cn_nameiop == RENAME)) { 169168404Spjd error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 170168404Spjd cnp->cn_thread); 171168404Spjd if (error != 0) 172168404Spjd goto out; 173168404Spjd 174219089Spjd /* Allocate a new vnode on the matching entry. */ 175168840Spjd error = tmpfs_alloc_vp(dvp->v_mount, tnode, 176197201Spjd cnp->cn_lkflags, vpp); 177197201Spjd if (error != 0) 178197201Spjd goto out; 179197201Spjd 180222518Spjd if ((dnode->tn_mode & S_ISTXT) && 181222518Spjd VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) && 182222518Spjd VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) { 183222518Spjd error = EPERM; 184222518Spjd vput(*vpp); 185197201Spjd *vpp = NULL; 186197201Spjd goto out; 187197201Spjd } 188197201Spjd cnp->cn_flags |= SAVENAME; 189197201Spjd } else { 190185029Spjd error = tmpfs_alloc_vp(dvp->v_mount, tnode, 191185029Spjd cnp->cn_lkflags, vpp); 192185029Spjd } 193185029Spjd } 194185029Spjd } 195191990Sattilio 196185029Spjd /* Store the result of this lookup in the cache. Avoid this if the 197168404Spjd * request was for creation, as it does not improve timings on 198219089Spjd * emprical tests. */ 199315844Savg if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 200315844Savg cache_enter(dvp, *vpp, cnp); 201315844Savg 202315844Savgout: 203315844Savg /* If there were no errors, *vpp cannot be null and it must be 204315844Savg * locked. */ 205315844Savg MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 206242572Savg 207242572Savg return error; 208242572Savg} 209315844Savg 210219089Spjd/* --------------------------------------------------------------------- */ 211297021Smav 212324295Savgstatic int 213219089Spjdtmpfs_create(struct vop_create_args *v) 214219089Spjd{ 215168404Spjd struct vnode *dvp = v->a_dvp; 216219089Spjd struct vnode **vpp = v->a_vpp; 217219089Spjd struct componentname *cnp = v->a_cnp; 218219089Spjd struct vattr *vap = v->a_vap; 219219089Spjd 220219089Spjd MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 221219089Spjd 222168404Spjd return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 223168404Spjd} 224168404Spjd/* --------------------------------------------------------------------- */ 225168404Spjd 226168404Spjdstatic int 227219089Spjdtmpfs_mknod(struct vop_mknod_args *v) 228175202Sattilio{ 229168824Spjd struct vnode *dvp = v->a_dvp; 230168824Spjd struct vnode **vpp = v->a_vpp; 231168824Spjd struct componentname *cnp = v->a_cnp; 232197201Spjd struct vattr *vap = v->a_vap; 233197201Spjd 234197201Spjd if (vap->va_type != VBLK && vap->va_type != VCHR && 235168404Spjd vap->va_type != VFIFO) 236219089Spjd return EINVAL; 237219089Spjd 238219089Spjd return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 239219089Spjd} 240219089Spjd 241219089Spjd/* --------------------------------------------------------------------- */ 242219089Spjd 243219089Spjdstatic int 244302724Savgtmpfs_open(struct vop_open_args *v) 245219089Spjd{ 246219089Spjd struct vnode *vp = v->a_vp; 247219089Spjd int mode = v->a_mode; 248168404Spjd 249 int error; 250 struct tmpfs_node *node; 251 252 MPASS(VOP_ISLOCKED(vp)); 253 254 node = VP_TO_TMPFS_NODE(vp); 255 256 /* The file is still active but all its names have been removed 257 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 258 * it is about to die. */ 259 if (node->tn_links < 1) 260 return (ENOENT); 261 262 /* If the file is marked append-only, deny write requests. */ 263 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 264 error = EPERM; 265 else { 266 error = 0; 267 /* For regular files, the call below is nop. */ 268 vnode_create_vobject(vp, node->tn_size, v->a_td); 269 } 270 271 MPASS(VOP_ISLOCKED(vp)); 272 return error; 273} 274 275/* --------------------------------------------------------------------- */ 276 277static int 278tmpfs_close(struct vop_close_args *v) 279{ 280 struct vnode *vp = v->a_vp; 281 282 /* Update node times. */ 283 tmpfs_update(vp); 284 285 return (0); 286} 287 288/* --------------------------------------------------------------------- */ 289 290int 291tmpfs_access(struct vop_access_args *v) 292{ 293 struct vnode *vp = v->a_vp; 294 accmode_t accmode = v->a_accmode; 295 struct ucred *cred = v->a_cred; 296 297 int error; 298 struct tmpfs_node *node; 299 300 MPASS(VOP_ISLOCKED(vp)); 301 302 node = VP_TO_TMPFS_NODE(vp); 303 304 switch (vp->v_type) { 305 case VDIR: 306 /* FALLTHROUGH */ 307 case VLNK: 308 /* FALLTHROUGH */ 309 case VREG: 310 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 311 error = EROFS; 312 goto out; 313 } 314 break; 315 316 case VBLK: 317 /* FALLTHROUGH */ 318 case VCHR: 319 /* FALLTHROUGH */ 320 case VSOCK: 321 /* FALLTHROUGH */ 322 case VFIFO: 323 break; 324 325 default: 326 error = EINVAL; 327 goto out; 328 } 329 330 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 331 error = EPERM; 332 goto out; 333 } 334 335 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 336 node->tn_gid, accmode, cred, NULL); 337 338out: 339 MPASS(VOP_ISLOCKED(vp)); 340 341 return error; 342} 343 344/* --------------------------------------------------------------------- */ 345 346int 347tmpfs_getattr(struct vop_getattr_args *v) 348{ 349 struct vnode *vp = v->a_vp; 350 struct vattr *vap = v->a_vap; 351 352 struct tmpfs_node *node; 353 354 node = VP_TO_TMPFS_NODE(vp); 355 356 tmpfs_update(vp); 357 358 vap->va_type = vp->v_type; 359 vap->va_mode = node->tn_mode; 360 vap->va_nlink = node->tn_links; 361 vap->va_uid = node->tn_uid; 362 vap->va_gid = node->tn_gid; 363 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 364 vap->va_fileid = node->tn_id; 365 vap->va_size = node->tn_size; 366 vap->va_blocksize = PAGE_SIZE; 367 vap->va_atime = node->tn_atime; 368 vap->va_mtime = node->tn_mtime; 369 vap->va_ctime = node->tn_ctime; 370 vap->va_birthtime = node->tn_birthtime; 371 vap->va_gen = node->tn_gen; 372 vap->va_flags = node->tn_flags; 373 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 374 node->tn_rdev : NODEV; 375 vap->va_bytes = round_page(node->tn_size); 376 vap->va_filerev = 0; 377 378 return 0; 379} 380 381int 382tmpfs_setattr(struct vop_setattr_args *v) 383{ 384 struct vnode *vp = v->a_vp; 385 struct vattr *vap = v->a_vap; 386 struct ucred *cred = v->a_cred; 387 struct thread *td = curthread; 388 389 int error; 390 391 MPASS(VOP_ISLOCKED(vp)); 392 393 error = 0; 394 395 /* Abort if any unsettable attribute is given. */ 396 if (vap->va_type != VNON || 397 vap->va_nlink != VNOVAL || 398 vap->va_fsid != VNOVAL || 399 vap->va_fileid != VNOVAL || 400 vap->va_blocksize != VNOVAL || 401 vap->va_gen != VNOVAL || 402 vap->va_rdev != VNOVAL || 403 vap->va_bytes != VNOVAL) 404 error = EINVAL; 405 406 if (error == 0 && (vap->va_flags != VNOVAL)) 407 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 408 409 if (error == 0 && (vap->va_size != VNOVAL)) 410 error = tmpfs_chsize(vp, vap->va_size, cred, td); 411 412 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 413 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 414 415 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 416 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 417 418 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 419 vap->va_atime.tv_nsec != VNOVAL) || 420 (vap->va_mtime.tv_sec != VNOVAL && 421 vap->va_mtime.tv_nsec != VNOVAL) || 422 (vap->va_birthtime.tv_sec != VNOVAL && 423 vap->va_birthtime.tv_nsec != VNOVAL))) 424 error = tmpfs_chtimes(vp, vap, cred, td); 425 426 /* Update the node times. We give preference to the error codes 427 * generated by this function rather than the ones that may arise 428 * from tmpfs_update. */ 429 tmpfs_update(vp); 430 431 MPASS(VOP_ISLOCKED(vp)); 432 433 return error; 434} 435 436static int 437tmpfs_read(struct vop_read_args *v) 438{ 439 struct vnode *vp; 440 struct uio *uio; 441 struct tmpfs_node *node; 442 443 vp = v->a_vp; 444 if (vp->v_type != VREG) 445 return (EISDIR); 446 uio = v->a_uio; 447 if (uio->uio_offset < 0) 448 return (EINVAL); 449 node = VP_TO_TMPFS_NODE(vp); 450 node->tn_status |= TMPFS_NODE_ACCESSED; 451 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio)); 452} 453 454static int 455tmpfs_write(struct vop_write_args *v) 456{ 457 struct vnode *vp; 458 struct uio *uio; 459 struct tmpfs_node *node; 460 off_t oldsize; 461 int error, ioflag; 462 boolean_t extended; 463 464 vp = v->a_vp; 465 uio = v->a_uio; 466 ioflag = v->a_ioflag; 467 error = 0; 468 node = VP_TO_TMPFS_NODE(vp); 469 oldsize = node->tn_size; 470 471 if (uio->uio_offset < 0 || vp->v_type != VREG) 472 return (EINVAL); 473 if (uio->uio_resid == 0) 474 return (0); 475 if (ioflag & IO_APPEND) 476 uio->uio_offset = node->tn_size; 477 if (uio->uio_offset + uio->uio_resid > 478 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 479 return (EFBIG); 480 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 481 return (EFBIG); 482 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 483 if (extended) { 484 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 485 FALSE); 486 if (error != 0) 487 goto out; 488 } 489 490 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio); 491 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 492 (extended ? TMPFS_NODE_CHANGED : 0); 493 if (node->tn_mode & (S_ISUID | S_ISGID)) { 494 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 495 node->tn_mode &= ~(S_ISUID | S_ISGID); 496 } 497 if (error != 0) 498 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 499 500out: 501 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 502 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 503 504 return (error); 505} 506 507/* --------------------------------------------------------------------- */ 508 509static int 510tmpfs_fsync(struct vop_fsync_args *v) 511{ 512 struct vnode *vp = v->a_vp; 513 514 MPASS(VOP_ISLOCKED(vp)); 515 516 tmpfs_update(vp); 517 518 return 0; 519} 520 521/* --------------------------------------------------------------------- */ 522 523static int 524tmpfs_remove(struct vop_remove_args *v) 525{ 526 struct vnode *dvp = v->a_dvp; 527 struct vnode *vp = v->a_vp; 528 529 int error; 530 struct tmpfs_dirent *de; 531 struct tmpfs_mount *tmp; 532 struct tmpfs_node *dnode; 533 struct tmpfs_node *node; 534 535 MPASS(VOP_ISLOCKED(dvp)); 536 MPASS(VOP_ISLOCKED(vp)); 537 538 if (vp->v_type == VDIR) { 539 error = EISDIR; 540 goto out; 541 } 542 543 dnode = VP_TO_TMPFS_DIR(dvp); 544 node = VP_TO_TMPFS_NODE(vp); 545 tmp = VFS_TO_TMPFS(vp->v_mount); 546 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 547 MPASS(de != NULL); 548 549 /* Files marked as immutable or append-only cannot be deleted. */ 550 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 551 (dnode->tn_flags & APPEND)) { 552 error = EPERM; 553 goto out; 554 } 555 556 /* Remove the entry from the directory; as it is a file, we do not 557 * have to change the number of hard links of the directory. */ 558 tmpfs_dir_detach(dvp, de); 559 if (v->a_cnp->cn_flags & DOWHITEOUT) 560 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 561 562 /* Free the directory entry we just deleted. Note that the node 563 * referred by it will not be removed until the vnode is really 564 * reclaimed. */ 565 tmpfs_free_dirent(tmp, de); 566 567 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 568 error = 0; 569 570out: 571 572 return error; 573} 574 575/* --------------------------------------------------------------------- */ 576 577static int 578tmpfs_link(struct vop_link_args *v) 579{ 580 struct vnode *dvp = v->a_tdvp; 581 struct vnode *vp = v->a_vp; 582 struct componentname *cnp = v->a_cnp; 583 584 int error; 585 struct tmpfs_dirent *de; 586 struct tmpfs_node *node; 587 588 MPASS(VOP_ISLOCKED(dvp)); 589 MPASS(cnp->cn_flags & HASBUF); 590 MPASS(dvp != vp); /* XXX When can this be false? */ 591 592 node = VP_TO_TMPFS_NODE(vp); 593 594 /* XXX: Why aren't the following two tests done by the caller? */ 595 596 /* Hard links of directories are forbidden. */ 597 if (vp->v_type == VDIR) { 598 error = EPERM; 599 goto out; 600 } 601 602 /* Cannot create cross-device links. */ 603 if (dvp->v_mount != vp->v_mount) { 604 error = EXDEV; 605 goto out; 606 } 607 608 /* Ensure that we do not overflow the maximum number of links imposed 609 * by the system. */ 610 MPASS(node->tn_links <= LINK_MAX); 611 if (node->tn_links == LINK_MAX) { 612 error = EMLINK; 613 goto out; 614 } 615 616 /* We cannot create links of files marked immutable or append-only. */ 617 if (node->tn_flags & (IMMUTABLE | APPEND)) { 618 error = EPERM; 619 goto out; 620 } 621 622 /* Allocate a new directory entry to represent the node. */ 623 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 624 cnp->cn_nameptr, cnp->cn_namelen, &de); 625 if (error != 0) 626 goto out; 627 628 /* Insert the new directory entry into the appropriate directory. */ 629 if (cnp->cn_flags & ISWHITEOUT) 630 tmpfs_dir_whiteout_remove(dvp, cnp); 631 tmpfs_dir_attach(dvp, de); 632 633 /* vp link count has changed, so update node times. */ 634 node->tn_status |= TMPFS_NODE_CHANGED; 635 tmpfs_update(vp); 636 637 error = 0; 638 639out: 640 return error; 641} 642 643/* --------------------------------------------------------------------- */ 644 645/* 646 * We acquire all but fdvp locks using non-blocking acquisitions. If we 647 * fail to acquire any lock in the path we will drop all held locks, 648 * acquire the new lock in a blocking fashion, and then release it and 649 * restart the rename. This acquire/release step ensures that we do not 650 * spin on a lock waiting for release. On error release all vnode locks 651 * and decrement references the way tmpfs_rename() would do. 652 */ 653static int 654tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 655 struct vnode *tdvp, struct vnode **tvpp, 656 struct componentname *fcnp, struct componentname *tcnp) 657{ 658 struct vnode *nvp; 659 struct mount *mp; 660 struct tmpfs_dirent *de; 661 int error, restarts = 0; 662 663 VOP_UNLOCK(tdvp, 0); 664 if (*tvpp != NULL && *tvpp != tdvp) 665 VOP_UNLOCK(*tvpp, 0); 666 mp = fdvp->v_mount; 667 668relock: 669 restarts += 1; 670 error = vn_lock(fdvp, LK_EXCLUSIVE); 671 if (error) 672 goto releout; 673 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 674 VOP_UNLOCK(fdvp, 0); 675 error = vn_lock(tdvp, LK_EXCLUSIVE); 676 if (error) 677 goto releout; 678 VOP_UNLOCK(tdvp, 0); 679 goto relock; 680 } 681 /* 682 * Re-resolve fvp to be certain it still exists and fetch the 683 * correct vnode. 684 */ 685 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 686 if (de == NULL) { 687 VOP_UNLOCK(fdvp, 0); 688 VOP_UNLOCK(tdvp, 0); 689 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 690 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 691 error = EINVAL; 692 else 693 error = ENOENT; 694 goto releout; 695 } 696 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 697 if (error != 0) { 698 VOP_UNLOCK(fdvp, 0); 699 VOP_UNLOCK(tdvp, 0); 700 if (error != EBUSY) 701 goto releout; 702 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 703 if (error != 0) 704 goto releout; 705 VOP_UNLOCK(nvp, 0); 706 /* 707 * Concurrent rename race. 708 */ 709 if (nvp == tdvp) { 710 vrele(nvp); 711 error = EINVAL; 712 goto releout; 713 } 714 vrele(*fvpp); 715 *fvpp = nvp; 716 goto relock; 717 } 718 vrele(*fvpp); 719 *fvpp = nvp; 720 VOP_UNLOCK(*fvpp, 0); 721 /* 722 * Re-resolve tvp and acquire the vnode lock if present. 723 */ 724 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 725 /* 726 * If tvp disappeared we just carry on. 727 */ 728 if (de == NULL && *tvpp != NULL) { 729 vrele(*tvpp); 730 *tvpp = NULL; 731 } 732 /* 733 * Get the tvp ino if the lookup succeeded. We may have to restart 734 * if the non-blocking acquire fails. 735 */ 736 if (de != NULL) { 737 nvp = NULL; 738 error = tmpfs_alloc_vp(mp, de->td_node, 739 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 740 if (*tvpp != NULL) 741 vrele(*tvpp); 742 *tvpp = nvp; 743 if (error != 0) { 744 VOP_UNLOCK(fdvp, 0); 745 VOP_UNLOCK(tdvp, 0); 746 if (error != EBUSY) 747 goto releout; 748 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 749 &nvp); 750 if (error != 0) 751 goto releout; 752 VOP_UNLOCK(nvp, 0); 753 /* 754 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 755 */ 756 if (nvp == fdvp) { 757 error = ENOTEMPTY; 758 goto releout; 759 } 760 goto relock; 761 } 762 } 763 tmpfs_rename_restarts += restarts; 764 765 return (0); 766 767releout: 768 vrele(fdvp); 769 vrele(*fvpp); 770 vrele(tdvp); 771 if (*tvpp != NULL) 772 vrele(*tvpp); 773 tmpfs_rename_restarts += restarts; 774 775 return (error); 776} 777 778static int 779tmpfs_rename(struct vop_rename_args *v) 780{ 781 struct vnode *fdvp = v->a_fdvp; 782 struct vnode *fvp = v->a_fvp; 783 struct componentname *fcnp = v->a_fcnp; 784 struct vnode *tdvp = v->a_tdvp; 785 struct vnode *tvp = v->a_tvp; 786 struct componentname *tcnp = v->a_tcnp; 787 struct mount *mp = NULL; 788 789 char *newname; 790 int error; 791 struct tmpfs_dirent *de; 792 struct tmpfs_mount *tmp; 793 struct tmpfs_node *fdnode; 794 struct tmpfs_node *fnode; 795 struct tmpfs_node *tnode; 796 struct tmpfs_node *tdnode; 797 798 MPASS(VOP_ISLOCKED(tdvp)); 799 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 800 MPASS(fcnp->cn_flags & HASBUF); 801 MPASS(tcnp->cn_flags & HASBUF); 802 803 /* Disallow cross-device renames. 804 * XXX Why isn't this done by the caller? */ 805 if (fvp->v_mount != tdvp->v_mount || 806 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 807 error = EXDEV; 808 goto out; 809 } 810 811 /* If source and target are the same file, there is nothing to do. */ 812 if (fvp == tvp) { 813 error = 0; 814 goto out; 815 } 816 817 /* If we need to move the directory between entries, lock the 818 * source so that we can safely operate on it. */ 819 if (fdvp != tdvp && fdvp != tvp) { 820 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 821 mp = tdvp->v_mount; 822 error = vfs_busy(mp, 0); 823 if (error != 0) { 824 mp = NULL; 825 goto out; 826 } 827 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 828 fcnp, tcnp); 829 if (error != 0) { 830 vfs_unbusy(mp); 831 return (error); 832 } 833 ASSERT_VOP_ELOCKED(fdvp, 834 "tmpfs_rename: fdvp not locked"); 835 ASSERT_VOP_ELOCKED(tdvp, 836 "tmpfs_rename: tdvp not locked"); 837 if (tvp != NULL) 838 ASSERT_VOP_ELOCKED(tvp, 839 "tmpfs_rename: tvp not locked"); 840 if (fvp == tvp) { 841 error = 0; 842 goto out_locked; 843 } 844 } 845 } 846 847 tmp = VFS_TO_TMPFS(tdvp->v_mount); 848 tdnode = VP_TO_TMPFS_DIR(tdvp); 849 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 850 fdnode = VP_TO_TMPFS_DIR(fdvp); 851 fnode = VP_TO_TMPFS_NODE(fvp); 852 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 853 854 /* Entry can disappear before we lock fdvp, 855 * also avoid manipulating '.' and '..' entries. */ 856 if (de == NULL) { 857 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 858 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 859 error = EINVAL; 860 else 861 error = ENOENT; 862 goto out_locked; 863 } 864 MPASS(de->td_node == fnode); 865 866 /* If re-naming a directory to another preexisting directory 867 * ensure that the target directory is empty so that its 868 * removal causes no side effects. 869 * Kern_rename gurantees the destination to be a directory 870 * if the source is one. */ 871 if (tvp != NULL) { 872 MPASS(tnode != NULL); 873 874 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 875 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 876 error = EPERM; 877 goto out_locked; 878 } 879 880 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 881 if (tnode->tn_size > 0) { 882 error = ENOTEMPTY; 883 goto out_locked; 884 } 885 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 886 error = ENOTDIR; 887 goto out_locked; 888 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 889 error = EISDIR; 890 goto out_locked; 891 } else { 892 MPASS(fnode->tn_type != VDIR && 893 tnode->tn_type != VDIR); 894 } 895 } 896 897 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 898 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 899 error = EPERM; 900 goto out_locked; 901 } 902 903 /* Ensure that we have enough memory to hold the new name, if it 904 * has to be changed. */ 905 if (fcnp->cn_namelen != tcnp->cn_namelen || 906 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 907 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 908 } else 909 newname = NULL; 910 911 /* If the node is being moved to another directory, we have to do 912 * the move. */ 913 if (fdnode != tdnode) { 914 /* In case we are moving a directory, we have to adjust its 915 * parent to point to the new parent. */ 916 if (de->td_node->tn_type == VDIR) { 917 struct tmpfs_node *n; 918 919 /* Ensure the target directory is not a child of the 920 * directory being moved. Otherwise, we'd end up 921 * with stale nodes. */ 922 n = tdnode; 923 /* TMPFS_LOCK garanties that no nodes are freed while 924 * traversing the list. Nodes can only be marked as 925 * removed: tn_parent == NULL. */ 926 TMPFS_LOCK(tmp); 927 TMPFS_NODE_LOCK(n); 928 while (n != n->tn_dir.tn_parent) { 929 struct tmpfs_node *parent; 930 931 if (n == fnode) { 932 TMPFS_NODE_UNLOCK(n); 933 TMPFS_UNLOCK(tmp); 934 error = EINVAL; 935 if (newname != NULL) 936 free(newname, M_TMPFSNAME); 937 goto out_locked; 938 } 939 parent = n->tn_dir.tn_parent; 940 TMPFS_NODE_UNLOCK(n); 941 if (parent == NULL) { 942 n = NULL; 943 break; 944 } 945 TMPFS_NODE_LOCK(parent); 946 if (parent->tn_dir.tn_parent == NULL) { 947 TMPFS_NODE_UNLOCK(parent); 948 n = NULL; 949 break; 950 } 951 n = parent; 952 } 953 TMPFS_UNLOCK(tmp); 954 if (n == NULL) { 955 error = EINVAL; 956 if (newname != NULL) 957 free(newname, M_TMPFSNAME); 958 goto out_locked; 959 } 960 TMPFS_NODE_UNLOCK(n); 961 962 /* Adjust the parent pointer. */ 963 TMPFS_VALIDATE_DIR(fnode); 964 TMPFS_NODE_LOCK(de->td_node); 965 de->td_node->tn_dir.tn_parent = tdnode; 966 TMPFS_NODE_UNLOCK(de->td_node); 967 968 /* As a result of changing the target of the '..' 969 * entry, the link count of the source and target 970 * directories has to be adjusted. */ 971 TMPFS_NODE_LOCK(tdnode); 972 TMPFS_ASSERT_LOCKED(tdnode); 973 tdnode->tn_links++; 974 TMPFS_NODE_UNLOCK(tdnode); 975 976 TMPFS_NODE_LOCK(fdnode); 977 TMPFS_ASSERT_LOCKED(fdnode); 978 fdnode->tn_links--; 979 TMPFS_NODE_UNLOCK(fdnode); 980 } 981 } 982 983 /* Do the move: just remove the entry from the source directory 984 * and insert it into the target one. */ 985 tmpfs_dir_detach(fdvp, de); 986 987 if (fcnp->cn_flags & DOWHITEOUT) 988 tmpfs_dir_whiteout_add(fdvp, fcnp); 989 if (tcnp->cn_flags & ISWHITEOUT) 990 tmpfs_dir_whiteout_remove(tdvp, tcnp); 991 992 /* If the name has changed, we need to make it effective by changing 993 * it in the directory entry. */ 994 if (newname != NULL) { 995 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 996 997 free(de->ud.td_name, M_TMPFSNAME); 998 de->ud.td_name = newname; 999 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 1000 1001 fnode->tn_status |= TMPFS_NODE_CHANGED; 1002 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1003 } 1004 1005 /* If we are overwriting an entry, we have to remove the old one 1006 * from the target directory. */ 1007 if (tvp != NULL) { 1008 struct tmpfs_dirent *tde; 1009 1010 /* Remove the old entry from the target directory. */ 1011 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1012 tmpfs_dir_detach(tdvp, tde); 1013 1014 /* Free the directory entry we just deleted. Note that the 1015 * node referred by it will not be removed until the vnode is 1016 * really reclaimed. */ 1017 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1018 } 1019 1020 tmpfs_dir_attach(tdvp, de); 1021 1022 cache_purge(fvp); 1023 if (tvp != NULL) 1024 cache_purge(tvp); 1025 cache_purge_negative(tdvp); 1026 1027 error = 0; 1028 1029out_locked: 1030 if (fdvp != tdvp && fdvp != tvp) 1031 VOP_UNLOCK(fdvp, 0); 1032 1033out: 1034 /* Release target nodes. */ 1035 /* XXX: I don't understand when tdvp can be the same as tvp, but 1036 * other code takes care of this... */ 1037 if (tdvp == tvp) 1038 vrele(tdvp); 1039 else 1040 vput(tdvp); 1041 if (tvp != NULL) 1042 vput(tvp); 1043 1044 /* Release source nodes. */ 1045 vrele(fdvp); 1046 vrele(fvp); 1047 1048 if (mp != NULL) 1049 vfs_unbusy(mp); 1050 1051 return error; 1052} 1053 1054/* --------------------------------------------------------------------- */ 1055 1056static int 1057tmpfs_mkdir(struct vop_mkdir_args *v) 1058{ 1059 struct vnode *dvp = v->a_dvp; 1060 struct vnode **vpp = v->a_vpp; 1061 struct componentname *cnp = v->a_cnp; 1062 struct vattr *vap = v->a_vap; 1063 1064 MPASS(vap->va_type == VDIR); 1065 1066 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1067} 1068 1069/* --------------------------------------------------------------------- */ 1070 1071static int 1072tmpfs_rmdir(struct vop_rmdir_args *v) 1073{ 1074 struct vnode *dvp = v->a_dvp; 1075 struct vnode *vp = v->a_vp; 1076 1077 int error; 1078 struct tmpfs_dirent *de; 1079 struct tmpfs_mount *tmp; 1080 struct tmpfs_node *dnode; 1081 struct tmpfs_node *node; 1082 1083 MPASS(VOP_ISLOCKED(dvp)); 1084 MPASS(VOP_ISLOCKED(vp)); 1085 1086 tmp = VFS_TO_TMPFS(dvp->v_mount); 1087 dnode = VP_TO_TMPFS_DIR(dvp); 1088 node = VP_TO_TMPFS_DIR(vp); 1089 1090 /* Directories with more than two entries ('.' and '..') cannot be 1091 * removed. */ 1092 if (node->tn_size > 0) { 1093 error = ENOTEMPTY; 1094 goto out; 1095 } 1096 1097 if ((dnode->tn_flags & APPEND) 1098 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1099 error = EPERM; 1100 goto out; 1101 } 1102 1103 /* This invariant holds only if we are not trying to remove "..". 1104 * We checked for that above so this is safe now. */ 1105 MPASS(node->tn_dir.tn_parent == dnode); 1106 1107 /* Get the directory entry associated with node (vp). This was 1108 * filled by tmpfs_lookup while looking up the entry. */ 1109 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1110 MPASS(TMPFS_DIRENT_MATCHES(de, 1111 v->a_cnp->cn_nameptr, 1112 v->a_cnp->cn_namelen)); 1113 1114 /* Check flags to see if we are allowed to remove the directory. */ 1115 if (dnode->tn_flags & APPEND 1116 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1117 error = EPERM; 1118 goto out; 1119 } 1120 1121 1122 /* Detach the directory entry from the directory (dnode). */ 1123 tmpfs_dir_detach(dvp, de); 1124 if (v->a_cnp->cn_flags & DOWHITEOUT) 1125 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1126 1127 /* No vnode should be allocated for this entry from this point */ 1128 TMPFS_NODE_LOCK(node); 1129 TMPFS_ASSERT_ELOCKED(node); 1130 node->tn_links--; 1131 node->tn_dir.tn_parent = NULL; 1132 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1133 TMPFS_NODE_MODIFIED; 1134 1135 TMPFS_NODE_UNLOCK(node); 1136 1137 TMPFS_NODE_LOCK(dnode); 1138 TMPFS_ASSERT_ELOCKED(dnode); 1139 dnode->tn_links--; 1140 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1141 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1142 TMPFS_NODE_UNLOCK(dnode); 1143 1144 cache_purge(dvp); 1145 cache_purge(vp); 1146 1147 /* Free the directory entry we just deleted. Note that the node 1148 * referred by it will not be removed until the vnode is really 1149 * reclaimed. */ 1150 tmpfs_free_dirent(tmp, de); 1151 1152 /* Release the deleted vnode (will destroy the node, notify 1153 * interested parties and clean it from the cache). */ 1154 1155 dnode->tn_status |= TMPFS_NODE_CHANGED; 1156 tmpfs_update(dvp); 1157 1158 error = 0; 1159 1160out: 1161 return error; 1162} 1163 1164/* --------------------------------------------------------------------- */ 1165 1166static int 1167tmpfs_symlink(struct vop_symlink_args *v) 1168{ 1169 struct vnode *dvp = v->a_dvp; 1170 struct vnode **vpp = v->a_vpp; 1171 struct componentname *cnp = v->a_cnp; 1172 struct vattr *vap = v->a_vap; 1173 char *target = v->a_target; 1174 1175#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1176 MPASS(vap->va_type == VLNK); 1177#else 1178 vap->va_type = VLNK; 1179#endif 1180 1181 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1182} 1183 1184/* --------------------------------------------------------------------- */ 1185 1186static int 1187tmpfs_readdir(struct vop_readdir_args *v) 1188{ 1189 struct vnode *vp = v->a_vp; 1190 struct uio *uio = v->a_uio; 1191 int *eofflag = v->a_eofflag; 1192 u_long **cookies = v->a_cookies; 1193 int *ncookies = v->a_ncookies; 1194 1195 int error; 1196 ssize_t startresid; 1197 int maxcookies; 1198 struct tmpfs_node *node; 1199 1200 /* This operation only makes sense on directory nodes. */ 1201 if (vp->v_type != VDIR) 1202 return ENOTDIR; 1203 1204 maxcookies = 0; 1205 node = VP_TO_TMPFS_DIR(vp); 1206 1207 startresid = uio->uio_resid; 1208 1209 /* Allocate cookies for NFS and compat modules. */ 1210 if (cookies != NULL && ncookies != NULL) { 1211 maxcookies = howmany(node->tn_size, 1212 sizeof(struct tmpfs_dirent)) + 2; 1213 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1214 M_WAITOK); 1215 *ncookies = 0; 1216 } 1217 1218 if (cookies == NULL) 1219 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1220 else 1221 error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies, 1222 ncookies); 1223 1224 /* Buffer was filled without hitting EOF. */ 1225 if (error == EJUSTRETURN) 1226 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1227 1228 if (error != 0 && cookies != NULL) 1229 free(*cookies, M_TEMP); 1230 1231 if (eofflag != NULL) 1232 *eofflag = 1233 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1234 1235 return error; 1236} 1237 1238/* --------------------------------------------------------------------- */ 1239 1240static int 1241tmpfs_readlink(struct vop_readlink_args *v) 1242{ 1243 struct vnode *vp = v->a_vp; 1244 struct uio *uio = v->a_uio; 1245 1246 int error; 1247 struct tmpfs_node *node; 1248 1249 MPASS(uio->uio_offset == 0); 1250 MPASS(vp->v_type == VLNK); 1251 1252 node = VP_TO_TMPFS_NODE(vp); 1253 1254 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1255 uio); 1256 node->tn_status |= TMPFS_NODE_ACCESSED; 1257 1258 return error; 1259} 1260 1261/* --------------------------------------------------------------------- */ 1262 1263static int 1264tmpfs_inactive(struct vop_inactive_args *v) 1265{ 1266 struct vnode *vp = v->a_vp; 1267 1268 struct tmpfs_node *node; 1269 1270 node = VP_TO_TMPFS_NODE(vp); 1271 1272 if (node->tn_links == 0) 1273 vrecycle(vp); 1274 1275 return 0; 1276} 1277 1278/* --------------------------------------------------------------------- */ 1279 1280int 1281tmpfs_reclaim(struct vop_reclaim_args *v) 1282{ 1283 struct vnode *vp = v->a_vp; 1284 1285 struct tmpfs_mount *tmp; 1286 struct tmpfs_node *node; 1287 1288 node = VP_TO_TMPFS_NODE(vp); 1289 tmp = VFS_TO_TMPFS(vp->v_mount); 1290 1291 if (vp->v_type == VREG) 1292 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1293 else 1294 vnode_destroy_vobject(vp); 1295 vp->v_object = NULL; 1296 cache_purge(vp); 1297 1298 TMPFS_NODE_LOCK(node); 1299 TMPFS_ASSERT_ELOCKED(node); 1300 tmpfs_free_vp(vp); 1301 1302 /* If the node referenced by this vnode was deleted by the user, 1303 * we must free its associated data structures (now that the vnode 1304 * is being reclaimed). */ 1305 if (node->tn_links == 0 && 1306 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1307 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1308 TMPFS_NODE_UNLOCK(node); 1309 tmpfs_free_node(tmp, node); 1310 } else 1311 TMPFS_NODE_UNLOCK(node); 1312 1313 MPASS(vp->v_data == NULL); 1314 return 0; 1315} 1316 1317/* --------------------------------------------------------------------- */ 1318 1319static int 1320tmpfs_print(struct vop_print_args *v) 1321{ 1322 struct vnode *vp = v->a_vp; 1323 1324 struct tmpfs_node *node; 1325 1326 node = VP_TO_TMPFS_NODE(vp); 1327 1328 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n", 1329 node, node->tn_flags, node->tn_links); 1330 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1331 node->tn_mode, node->tn_uid, node->tn_gid, 1332 (intmax_t)node->tn_size, node->tn_status); 1333 1334 if (vp->v_type == VFIFO) 1335 fifo_printinfo(vp); 1336 1337 printf("\n"); 1338 1339 return 0; 1340} 1341 1342/* --------------------------------------------------------------------- */ 1343 1344static int 1345tmpfs_pathconf(struct vop_pathconf_args *v) 1346{ 1347 int name = v->a_name; 1348 register_t *retval = v->a_retval; 1349 1350 int error; 1351 1352 error = 0; 1353 1354 switch (name) { 1355 case _PC_LINK_MAX: 1356 *retval = LINK_MAX; 1357 break; 1358 1359 case _PC_NAME_MAX: 1360 *retval = NAME_MAX; 1361 break; 1362 1363 case _PC_PATH_MAX: 1364 *retval = PATH_MAX; 1365 break; 1366 1367 case _PC_PIPE_BUF: 1368 *retval = PIPE_BUF; 1369 break; 1370 1371 case _PC_CHOWN_RESTRICTED: 1372 *retval = 1; 1373 break; 1374 1375 case _PC_NO_TRUNC: 1376 *retval = 1; 1377 break; 1378 1379 case _PC_SYNC_IO: 1380 *retval = 1; 1381 break; 1382 1383 case _PC_FILESIZEBITS: 1384 *retval = 0; /* XXX Don't know which value should I return. */ 1385 break; 1386 1387 default: 1388 error = EINVAL; 1389 } 1390 1391 return error; 1392} 1393 1394static int 1395tmpfs_vptofh(struct vop_vptofh_args *ap) 1396{ 1397 struct tmpfs_fid *tfhp; 1398 struct tmpfs_node *node; 1399 1400 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1401 node = VP_TO_TMPFS_NODE(ap->a_vp); 1402 1403 tfhp->tf_len = sizeof(struct tmpfs_fid); 1404 tfhp->tf_id = node->tn_id; 1405 tfhp->tf_gen = node->tn_gen; 1406 1407 return (0); 1408} 1409 1410static int 1411tmpfs_whiteout(struct vop_whiteout_args *ap) 1412{ 1413 struct vnode *dvp = ap->a_dvp; 1414 struct componentname *cnp = ap->a_cnp; 1415 struct tmpfs_dirent *de; 1416 1417 switch (ap->a_flags) { 1418 case LOOKUP: 1419 return (0); 1420 case CREATE: 1421 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1422 if (de != NULL) 1423 return (de->td_node == NULL ? 0 : EEXIST); 1424 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1425 case DELETE: 1426 tmpfs_dir_whiteout_remove(dvp, cnp); 1427 return (0); 1428 default: 1429 panic("tmpfs_whiteout: unknown op"); 1430 } 1431} 1432 1433/* --------------------------------------------------------------------- */ 1434 1435/* 1436 * vnode operations vector used for files stored in a tmpfs file system. 1437 */ 1438struct vop_vector tmpfs_vnodeop_entries = { 1439 .vop_default = &default_vnodeops, 1440 .vop_lookup = vfs_cache_lookup, 1441 .vop_cachedlookup = tmpfs_lookup, 1442 .vop_create = tmpfs_create, 1443 .vop_mknod = tmpfs_mknod, 1444 .vop_open = tmpfs_open, 1445 .vop_close = tmpfs_close, 1446 .vop_access = tmpfs_access, 1447 .vop_getattr = tmpfs_getattr, 1448 .vop_setattr = tmpfs_setattr, 1449 .vop_read = tmpfs_read, 1450 .vop_write = tmpfs_write, 1451 .vop_fsync = tmpfs_fsync, 1452 .vop_remove = tmpfs_remove, 1453 .vop_link = tmpfs_link, 1454 .vop_rename = tmpfs_rename, 1455 .vop_mkdir = tmpfs_mkdir, 1456 .vop_rmdir = tmpfs_rmdir, 1457 .vop_symlink = tmpfs_symlink, 1458 .vop_readdir = tmpfs_readdir, 1459 .vop_readlink = tmpfs_readlink, 1460 .vop_inactive = tmpfs_inactive, 1461 .vop_reclaim = tmpfs_reclaim, 1462 .vop_print = tmpfs_print, 1463 .vop_pathconf = tmpfs_pathconf, 1464 .vop_vptofh = tmpfs_vptofh, 1465 .vop_whiteout = tmpfs_whiteout, 1466 .vop_bmap = VOP_EOPNOTSUPP, 1467}; 1468 1469