Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/fs/tmpfs/tmpfs_vnops.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /* $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-2-Clause-NetBSD 5 * 6 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to The NetBSD Foundation 10 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 11 * 2005 program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 * POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 /* 36 * tmpfs vnode interface. 37 */ 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/dirent.h> 44 #include <sys/fcntl.h> 45 #include <sys/limits.h> 46 #include <sys/lockf.h> 47 #include <sys/lock.h> 48 #include <sys/mount.h> 49 #include <sys/namei.h> 50 #include <sys/priv.h> 51 #include <sys/proc.h> 52 #include <sys/rwlock.h> 53 #include <sys/sched.h> 54 #include <sys/stat.h> 55 #include <sys/sysctl.h> 56 #include <sys/unistd.h> 57 #include <sys/vnode.h> 58 59 #include <vm/vm.h> 60 #include <vm/vm_param.h> 61 #include <vm/vm_object.h> 62 63 #include <fs/tmpfs/tmpfs_vnops.h> 64 #include <fs/tmpfs/tmpfs.h> 65 66 SYSCTL_DECL(_vfs_tmpfs); 67 68 static volatile int tmpfs_rename_restarts; 69 SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD, 70 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0, 71 "Times rename had to restart due to lock contention"); 72 73 static int 74 tmpfs_vn_get_ino_alloc(struct mount *mp, void *arg, int lkflags, 75 struct vnode **rvp) 76 { 77 78 return (tmpfs_alloc_vp(mp, arg, lkflags, rvp)); 79 } 80 81 static int 82 tmpfs_lookup1(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp) 83 { 84 struct tmpfs_dirent *de; 85 struct tmpfs_node *dnode, *pnode; 86 struct tmpfs_mount *tm; 87 int error; 88 89 /* Caller assumes responsibility for ensuring access (VEXEC). */ 90 dnode = VP_TO_TMPFS_DIR(dvp); 91 *vpp = NULLVP; 92 93 /* We cannot be requesting the parent directory of the root node. */ 94 MPASS(IMPLIES(dnode->tn_type == VDIR && 95 dnode->tn_dir.tn_parent == dnode, 96 !(cnp->cn_flags & ISDOTDOT))); 97 98 TMPFS_ASSERT_LOCKED(dnode); 99 if (dnode->tn_dir.tn_parent == NULL) { 100 error = ENOENT; 101 goto out; 102 } 103 if (cnp->cn_flags & ISDOTDOT) { 104 tm = VFS_TO_TMPFS(dvp->v_mount); 105 pnode = dnode->tn_dir.tn_parent; 106 tmpfs_ref_node(pnode); 107 error = vn_vget_ino_gen(dvp, tmpfs_vn_get_ino_alloc, 108 pnode, cnp->cn_lkflags, vpp); 109 tmpfs_free_node(tm, pnode); 110 if (error != 0) 111 goto out; 112 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 113 VREF(dvp); 114 *vpp = dvp; 115 error = 0; 116 } else { 117 de = tmpfs_dir_lookup(dnode, NULL, cnp); 118 if (de != NULL && de->td_node == NULL) 119 cnp->cn_flags |= ISWHITEOUT; 120 if (de == NULL || de->td_node == NULL) { 121 /* 122 * The entry was not found in the directory. 123 * This is OK if we are creating or renaming an 124 * entry and are working on the last component of 125 * the path name. 126 */ 127 if ((cnp->cn_flags & ISLASTCN) && 128 (cnp->cn_nameiop == CREATE || \ 129 cnp->cn_nameiop == RENAME || 130 (cnp->cn_nameiop == DELETE && 131 cnp->cn_flags & DOWHITEOUT && 132 cnp->cn_flags & ISWHITEOUT))) { 133 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 134 cnp->cn_thread); 135 if (error != 0) 136 goto out; 137 138 /* 139 * Keep the component name in the buffer for 140 * future uses. 141 */ 142 cnp->cn_flags |= SAVENAME; 143 144 error = EJUSTRETURN; 145 } else 146 error = ENOENT; 147 } else { 148 struct tmpfs_node *tnode; 149 150 /* 151 * The entry was found, so get its associated 152 * tmpfs_node. 153 */ 154 tnode = de->td_node; 155 156 /* 157 * If we are not at the last path component and 158 * found a non-directory or non-link entry (which 159 * may itself be pointing to a directory), raise 160 * an error. 161 */ 162 if ((tnode->tn_type != VDIR && 163 tnode->tn_type != VLNK) && 164 !(cnp->cn_flags & ISLASTCN)) { 165 error = ENOTDIR; 166 goto out; 167 } 168 169 /* 170 * If we are deleting or renaming the entry, keep 171 * track of its tmpfs_dirent so that it can be 172 * easily deleted later. 173 */ 174 if ((cnp->cn_flags & ISLASTCN) && 175 (cnp->cn_nameiop == DELETE || 176 cnp->cn_nameiop == RENAME)) { 177 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 178 cnp->cn_thread); 179 if (error != 0) 180 goto out; 181 182 /* Allocate a new vnode on the matching entry. */ 183 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 184 cnp->cn_lkflags, vpp); 185 if (error != 0) 186 goto out; 187 188 if ((dnode->tn_mode & S_ISTXT) && 189 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, 190 cnp->cn_thread) && VOP_ACCESS(*vpp, VADMIN, 191 cnp->cn_cred, cnp->cn_thread)) { 192 error = EPERM; 193 vput(*vpp); 194 *vpp = NULL; 195 goto out; 196 } 197 cnp->cn_flags |= SAVENAME; 198 } else { 199 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 200 cnp->cn_lkflags, vpp); 201 if (error != 0) 202 goto out; 203 } 204 } 205 } 206 207 /* 208 * Store the result of this lookup in the cache. Avoid this if the 209 * request was for creation, as it does not improve timings on 210 * emprical tests. 211 */ 212 if ((cnp->cn_flags & MAKEENTRY) != 0 && tmpfs_use_nc(dvp)) 213 cache_enter(dvp, *vpp, cnp); 214 215 out: 216 /* 217 * If there were no errors, *vpp cannot be null and it must be 218 * locked. 219 */ 220 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 221 222 return (error); 223 } 224 225 static int 226 tmpfs_cached_lookup(struct vop_cachedlookup_args *v) 227 { 228 229 return (tmpfs_lookup1(v->a_dvp, v->a_vpp, v->a_cnp)); 230 } 231 232 static int 233 tmpfs_lookup(struct vop_lookup_args *v) 234 { 235 struct vnode *dvp = v->a_dvp; 236 struct vnode **vpp = v->a_vpp; 237 struct componentname *cnp = v->a_cnp; 238 int error; 239 240 /* Check accessibility of requested node as a first step. */ 241 error = vn_dir_check_exec(dvp, cnp); 242 if (error != 0) 243 return (error); 244 245 return (tmpfs_lookup1(dvp, vpp, cnp)); 246 } 247 248 static int 249 tmpfs_create(struct vop_create_args *v) 250 { 251 struct vnode *dvp = v->a_dvp; 252 struct vnode **vpp = v->a_vpp; 253 struct componentname *cnp = v->a_cnp; 254 struct vattr *vap = v->a_vap; 255 int error; 256 257 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 258 259 error = tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 260 if (error == 0 && (cnp->cn_flags & MAKEENTRY) != 0 && tmpfs_use_nc(dvp)) 261 cache_enter(dvp, *vpp, cnp); 262 return (error); 263 } 264 265 static int 266 tmpfs_mknod(struct vop_mknod_args *v) 267 { 268 struct vnode *dvp = v->a_dvp; 269 struct vnode **vpp = v->a_vpp; 270 struct componentname *cnp = v->a_cnp; 271 struct vattr *vap = v->a_vap; 272 273 if (vap->va_type != VBLK && vap->va_type != VCHR && 274 vap->va_type != VFIFO) 275 return (EINVAL); 276 277 return (tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL)); 278 } 279 280 static int 281 tmpfs_open(struct vop_open_args *v) 282 { 283 struct vnode *vp = v->a_vp; 284 int mode = v->a_mode; 285 286 int error; 287 struct tmpfs_node *node; 288 289 MPASS(VOP_ISLOCKED(vp)); 290 291 node = VP_TO_TMPFS_NODE(vp); 292 293 /* The file is still active but all its names have been removed 294 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 295 * it is about to die. */ 296 if (node->tn_links < 1) 297 return (ENOENT); 298 299 /* If the file is marked append-only, deny write requests. */ 300 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 301 error = EPERM; 302 else { 303 error = 0; 304 /* For regular files, the call below is nop. */ 305 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags & 306 OBJ_DEAD) == 0, ("dead object")); 307 vnode_create_vobject(vp, node->tn_size, v->a_td); 308 } 309 310 MPASS(VOP_ISLOCKED(vp)); 311 return error; 312 } 313 314 static int 315 tmpfs_close(struct vop_close_args *v) 316 { 317 struct vnode *vp = v->a_vp; 318 319 /* Update node times. */ 320 tmpfs_update(vp); 321 322 return (0); 323 } 324 325 int 326 tmpfs_access(struct vop_access_args *v) 327 { 328 struct vnode *vp = v->a_vp; 329 accmode_t accmode = v->a_accmode; 330 struct ucred *cred = v->a_cred; 331 332 int error; 333 struct tmpfs_node *node; 334 335 MPASS(VOP_ISLOCKED(vp)); 336 337 node = VP_TO_TMPFS_NODE(vp); 338 339 switch (vp->v_type) { 340 case VDIR: 341 /* FALLTHROUGH */ 342 case VLNK: 343 /* FALLTHROUGH */ 344 case VREG: 345 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 346 error = EROFS; 347 goto out; 348 } 349 break; 350 351 case VBLK: 352 /* FALLTHROUGH */ 353 case VCHR: 354 /* FALLTHROUGH */ 355 case VSOCK: 356 /* FALLTHROUGH */ 357 case VFIFO: 358 break; 359 360 default: 361 error = EINVAL; 362 goto out; 363 } 364 365 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 366 error = EPERM; 367 goto out; 368 } 369 370 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 371 node->tn_gid, accmode, cred, NULL); 372 373 out: 374 MPASS(VOP_ISLOCKED(vp)); 375 376 return (error); 377 } 378 379 int 380 tmpfs_getattr(struct vop_getattr_args *v) 381 { 382 struct vnode *vp = v->a_vp; 383 struct vattr *vap = v->a_vap; 384 vm_object_t obj; 385 struct tmpfs_node *node; 386 387 node = VP_TO_TMPFS_NODE(vp); 388 389 tmpfs_update(vp); 390 391 vap->va_type = vp->v_type; 392 vap->va_mode = node->tn_mode; 393 vap->va_nlink = node->tn_links; 394 vap->va_uid = node->tn_uid; 395 vap->va_gid = node->tn_gid; 396 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 397 vap->va_fileid = node->tn_id; 398 vap->va_size = node->tn_size; 399 vap->va_blocksize = PAGE_SIZE; 400 vap->va_atime = node->tn_atime; 401 vap->va_mtime = node->tn_mtime; 402 vap->va_ctime = node->tn_ctime; 403 vap->va_birthtime = node->tn_birthtime; 404 vap->va_gen = node->tn_gen; 405 vap->va_flags = node->tn_flags; 406 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 407 node->tn_rdev : NODEV; 408 if (vp->v_type == VREG) { 409 obj = node->tn_reg.tn_aobj; 410 vap->va_bytes = (u_quad_t)obj->resident_page_count * PAGE_SIZE; 411 } else 412 vap->va_bytes = node->tn_size; 413 vap->va_filerev = 0; 414 415 return (0); 416 } 417 418 int 419 tmpfs_setattr(struct vop_setattr_args *v) 420 { 421 struct vnode *vp = v->a_vp; 422 struct vattr *vap = v->a_vap; 423 struct ucred *cred = v->a_cred; 424 struct thread *td = curthread; 425 426 int error; 427 428 MPASS(VOP_ISLOCKED(vp)); 429 430 error = 0; 431 432 /* Abort if any unsettable attribute is given. */ 433 if (vap->va_type != VNON || 434 vap->va_nlink != VNOVAL || 435 vap->va_fsid != VNOVAL || 436 vap->va_fileid != VNOVAL || 437 vap->va_blocksize != VNOVAL || 438 vap->va_gen != VNOVAL || 439 vap->va_rdev != VNOVAL || 440 vap->va_bytes != VNOVAL) 441 error = EINVAL; 442 443 if (error == 0 && (vap->va_flags != VNOVAL)) 444 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 445 446 if (error == 0 && (vap->va_size != VNOVAL)) 447 error = tmpfs_chsize(vp, vap->va_size, cred, td); 448 449 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 450 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 451 452 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 453 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 454 455 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 456 vap->va_atime.tv_nsec != VNOVAL) || 457 (vap->va_mtime.tv_sec != VNOVAL && 458 vap->va_mtime.tv_nsec != VNOVAL) || 459 (vap->va_birthtime.tv_sec != VNOVAL && 460 vap->va_birthtime.tv_nsec != VNOVAL))) 461 error = tmpfs_chtimes(vp, vap, cred, td); 462 463 /* 464 * Update the node times. We give preference to the error codes 465 * generated by this function rather than the ones that may arise 466 * from tmpfs_update. 467 */ 468 tmpfs_update(vp); 469 470 MPASS(VOP_ISLOCKED(vp)); 471 472 return (error); 473 } 474 475 static int 476 tmpfs_read(struct vop_read_args *v) 477 { 478 struct vnode *vp; 479 struct uio *uio; 480 struct tmpfs_node *node; 481 482 vp = v->a_vp; 483 if (vp->v_type != VREG) 484 return (EISDIR); 485 uio = v->a_uio; 486 if (uio->uio_offset < 0) 487 return (EINVAL); 488 node = VP_TO_TMPFS_NODE(vp); 489 tmpfs_set_status(VFS_TO_TMPFS(vp->v_mount), node, TMPFS_NODE_ACCESSED); 490 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio)); 491 } 492 493 static int 494 tmpfs_write(struct vop_write_args *v) 495 { 496 struct vnode *vp; 497 struct uio *uio; 498 struct tmpfs_node *node; 499 off_t oldsize; 500 int error, ioflag; 501 502 vp = v->a_vp; 503 uio = v->a_uio; 504 ioflag = v->a_ioflag; 505 error = 0; 506 node = VP_TO_TMPFS_NODE(vp); 507 oldsize = node->tn_size; 508 509 if (uio->uio_offset < 0 || vp->v_type != VREG) 510 return (EINVAL); 511 if (uio->uio_resid == 0) 512 return (0); 513 if (ioflag & IO_APPEND) 514 uio->uio_offset = node->tn_size; 515 if (uio->uio_offset + uio->uio_resid > 516 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 517 return (EFBIG); 518 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 519 return (EFBIG); 520 if (uio->uio_offset + uio->uio_resid > node->tn_size) { 521 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 522 FALSE); 523 if (error != 0) 524 goto out; 525 } 526 527 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio); 528 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 529 TMPFS_NODE_CHANGED; 530 if (node->tn_mode & (S_ISUID | S_ISGID)) { 531 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 532 node->tn_mode &= ~(S_ISUID | S_ISGID); 533 } 534 if (error != 0) 535 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 536 537 out: 538 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 539 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 540 541 return (error); 542 } 543 544 static int 545 tmpfs_fsync(struct vop_fsync_args *v) 546 { 547 struct vnode *vp = v->a_vp; 548 549 MPASS(VOP_ISLOCKED(vp)); 550 551 tmpfs_check_mtime(vp); 552 tmpfs_update(vp); 553 554 return (0); 555 } 556 557 static int 558 tmpfs_remove(struct vop_remove_args *v) 559 { 560 struct vnode *dvp = v->a_dvp; 561 struct vnode *vp = v->a_vp; 562 563 int error; 564 struct tmpfs_dirent *de; 565 struct tmpfs_mount *tmp; 566 struct tmpfs_node *dnode; 567 struct tmpfs_node *node; 568 569 MPASS(VOP_ISLOCKED(dvp)); 570 MPASS(VOP_ISLOCKED(vp)); 571 572 if (vp->v_type == VDIR) { 573 error = EISDIR; 574 goto out; 575 } 576 577 dnode = VP_TO_TMPFS_DIR(dvp); 578 node = VP_TO_TMPFS_NODE(vp); 579 tmp = VFS_TO_TMPFS(vp->v_mount); 580 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 581 MPASS(de != NULL); 582 583 /* Files marked as immutable or append-only cannot be deleted. */ 584 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 585 (dnode->tn_flags & APPEND)) { 586 error = EPERM; 587 goto out; 588 } 589 590 /* Remove the entry from the directory; as it is a file, we do not 591 * have to change the number of hard links of the directory. */ 592 tmpfs_dir_detach(dvp, de); 593 if (v->a_cnp->cn_flags & DOWHITEOUT) 594 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 595 596 /* Free the directory entry we just deleted. Note that the node 597 * referred by it will not be removed until the vnode is really 598 * reclaimed. */ 599 tmpfs_free_dirent(tmp, de); 600 601 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 602 error = 0; 603 604 out: 605 return (error); 606 } 607 608 static int 609 tmpfs_link(struct vop_link_args *v) 610 { 611 struct vnode *dvp = v->a_tdvp; 612 struct vnode *vp = v->a_vp; 613 struct componentname *cnp = v->a_cnp; 614 615 int error; 616 struct tmpfs_dirent *de; 617 struct tmpfs_node *node; 618 619 MPASS(VOP_ISLOCKED(dvp)); 620 MPASS(cnp->cn_flags & HASBUF); 621 MPASS(dvp != vp); /* XXX When can this be false? */ 622 node = VP_TO_TMPFS_NODE(vp); 623 624 /* Ensure that we do not overflow the maximum number of links imposed 625 * by the system. */ 626 MPASS(node->tn_links <= TMPFS_LINK_MAX); 627 if (node->tn_links == TMPFS_LINK_MAX) { 628 error = EMLINK; 629 goto out; 630 } 631 632 /* We cannot create links of files marked immutable or append-only. */ 633 if (node->tn_flags & (IMMUTABLE | APPEND)) { 634 error = EPERM; 635 goto out; 636 } 637 638 /* Allocate a new directory entry to represent the node. */ 639 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 640 cnp->cn_nameptr, cnp->cn_namelen, &de); 641 if (error != 0) 642 goto out; 643 644 /* Insert the new directory entry into the appropriate directory. */ 645 if (cnp->cn_flags & ISWHITEOUT) 646 tmpfs_dir_whiteout_remove(dvp, cnp); 647 tmpfs_dir_attach(dvp, de); 648 649 /* vp link count has changed, so update node times. */ 650 node->tn_status |= TMPFS_NODE_CHANGED; 651 tmpfs_update(vp); 652 653 error = 0; 654 655 out: 656 return (error); 657 } 658 659 /* 660 * We acquire all but fdvp locks using non-blocking acquisitions. If we 661 * fail to acquire any lock in the path we will drop all held locks, 662 * acquire the new lock in a blocking fashion, and then release it and 663 * restart the rename. This acquire/release step ensures that we do not 664 * spin on a lock waiting for release. On error release all vnode locks 665 * and decrement references the way tmpfs_rename() would do. 666 */ 667 static int 668 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 669 struct vnode *tdvp, struct vnode **tvpp, 670 struct componentname *fcnp, struct componentname *tcnp) 671 { 672 struct vnode *nvp; 673 struct mount *mp; 674 struct tmpfs_dirent *de; 675 int error, restarts = 0; 676 677 VOP_UNLOCK(tdvp, 0); 678 if (*tvpp != NULL && *tvpp != tdvp) 679 VOP_UNLOCK(*tvpp, 0); 680 mp = fdvp->v_mount; 681 682 relock: 683 restarts += 1; 684 error = vn_lock(fdvp, LK_EXCLUSIVE); 685 if (error) 686 goto releout; 687 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 688 VOP_UNLOCK(fdvp, 0); 689 error = vn_lock(tdvp, LK_EXCLUSIVE); 690 if (error) 691 goto releout; 692 VOP_UNLOCK(tdvp, 0); 693 goto relock; 694 } 695 /* 696 * Re-resolve fvp to be certain it still exists and fetch the 697 * correct vnode. 698 */ 699 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 700 if (de == NULL) { 701 VOP_UNLOCK(fdvp, 0); 702 VOP_UNLOCK(tdvp, 0); 703 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 704 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 705 error = EINVAL; 706 else 707 error = ENOENT; 708 goto releout; 709 } 710 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 711 if (error != 0) { 712 VOP_UNLOCK(fdvp, 0); 713 VOP_UNLOCK(tdvp, 0); 714 if (error != EBUSY) 715 goto releout; 716 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 717 if (error != 0) 718 goto releout; 719 VOP_UNLOCK(nvp, 0); 720 /* 721 * Concurrent rename race. 722 */ 723 if (nvp == tdvp) { 724 vrele(nvp); 725 error = EINVAL; 726 goto releout; 727 } 728 vrele(*fvpp); 729 *fvpp = nvp; 730 goto relock; 731 } 732 vrele(*fvpp); 733 *fvpp = nvp; 734 VOP_UNLOCK(*fvpp, 0); 735 /* 736 * Re-resolve tvp and acquire the vnode lock if present. 737 */ 738 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 739 /* 740 * If tvp disappeared we just carry on. 741 */ 742 if (de == NULL && *tvpp != NULL) { 743 vrele(*tvpp); 744 *tvpp = NULL; 745 } 746 /* 747 * Get the tvp ino if the lookup succeeded. We may have to restart 748 * if the non-blocking acquire fails. 749 */ 750 if (de != NULL) { 751 nvp = NULL; 752 error = tmpfs_alloc_vp(mp, de->td_node, 753 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 754 if (*tvpp != NULL) 755 vrele(*tvpp); 756 *tvpp = nvp; 757 if (error != 0) { 758 VOP_UNLOCK(fdvp, 0); 759 VOP_UNLOCK(tdvp, 0); 760 if (error != EBUSY) 761 goto releout; 762 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 763 &nvp); 764 if (error != 0) 765 goto releout; 766 VOP_UNLOCK(nvp, 0); 767 /* 768 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 769 */ 770 if (nvp == fdvp) { 771 error = ENOTEMPTY; 772 goto releout; 773 } 774 goto relock; 775 } 776 } 777 tmpfs_rename_restarts += restarts; 778 779 return (0); 780 781 releout: 782 vrele(fdvp); 783 vrele(*fvpp); 784 vrele(tdvp); 785 if (*tvpp != NULL) 786 vrele(*tvpp); 787 tmpfs_rename_restarts += restarts; 788 789 return (error); 790 } 791 792 static int 793 tmpfs_rename(struct vop_rename_args *v) 794 { 795 struct vnode *fdvp = v->a_fdvp; 796 struct vnode *fvp = v->a_fvp; 797 struct componentname *fcnp = v->a_fcnp; 798 struct vnode *tdvp = v->a_tdvp; 799 struct vnode *tvp = v->a_tvp; 800 struct componentname *tcnp = v->a_tcnp; 801 char *newname; 802 struct tmpfs_dirent *de; 803 struct tmpfs_mount *tmp; 804 struct tmpfs_node *fdnode; 805 struct tmpfs_node *fnode; 806 struct tmpfs_node *tnode; 807 struct tmpfs_node *tdnode; 808 int error; 809 810 MPASS(VOP_ISLOCKED(tdvp)); 811 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 812 MPASS(fcnp->cn_flags & HASBUF); 813 MPASS(tcnp->cn_flags & HASBUF); 814 815 /* 816 * Disallow cross-device renames. 817 * XXX Why isn't this done by the caller? 818 */ 819 if (fvp->v_mount != tdvp->v_mount || 820 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 821 error = EXDEV; 822 goto out; 823 } 824 825 /* If source and target are the same file, there is nothing to do. */ 826 if (fvp == tvp) { 827 error = 0; 828 goto out; 829 } 830 831 /* 832 * If we need to move the directory between entries, lock the 833 * source so that we can safely operate on it. 834 */ 835 if (fdvp != tdvp && fdvp != tvp) { 836 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 837 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 838 fcnp, tcnp); 839 if (error != 0) 840 return (error); 841 ASSERT_VOP_ELOCKED(fdvp, 842 "tmpfs_rename: fdvp not locked"); 843 ASSERT_VOP_ELOCKED(tdvp, 844 "tmpfs_rename: tdvp not locked"); 845 if (tvp != NULL) 846 ASSERT_VOP_ELOCKED(tvp, 847 "tmpfs_rename: tvp not locked"); 848 if (fvp == tvp) { 849 error = 0; 850 goto out_locked; 851 } 852 } 853 } 854 855 tmp = VFS_TO_TMPFS(tdvp->v_mount); 856 tdnode = VP_TO_TMPFS_DIR(tdvp); 857 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 858 fdnode = VP_TO_TMPFS_DIR(fdvp); 859 fnode = VP_TO_TMPFS_NODE(fvp); 860 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 861 862 /* 863 * Entry can disappear before we lock fdvp, 864 * also avoid manipulating '.' and '..' entries. 865 */ 866 if (de == NULL) { 867 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 868 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 869 error = EINVAL; 870 else 871 error = ENOENT; 872 goto out_locked; 873 } 874 MPASS(de->td_node == fnode); 875 876 /* 877 * If re-naming a directory to another preexisting directory 878 * ensure that the target directory is empty so that its 879 * removal causes no side effects. 880 * Kern_rename guarantees the destination to be a directory 881 * if the source is one. 882 */ 883 if (tvp != NULL) { 884 MPASS(tnode != NULL); 885 886 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 887 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 888 error = EPERM; 889 goto out_locked; 890 } 891 892 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 893 if (tnode->tn_size > 0) { 894 error = ENOTEMPTY; 895 goto out_locked; 896 } 897 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 898 error = ENOTDIR; 899 goto out_locked; 900 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 901 error = EISDIR; 902 goto out_locked; 903 } else { 904 MPASS(fnode->tn_type != VDIR && 905 tnode->tn_type != VDIR); 906 } 907 } 908 909 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 910 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 911 error = EPERM; 912 goto out_locked; 913 } 914 915 /* 916 * Ensure that we have enough memory to hold the new name, if it 917 * has to be changed. 918 */ 919 if (fcnp->cn_namelen != tcnp->cn_namelen || 920 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 921 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 922 } else 923 newname = NULL; 924 925 /* 926 * If the node is being moved to another directory, we have to do 927 * the move. 928 */ 929 if (fdnode != tdnode) { 930 /* 931 * In case we are moving a directory, we have to adjust its 932 * parent to point to the new parent. 933 */ 934 if (de->td_node->tn_type == VDIR) { 935 struct tmpfs_node *n; 936 937 /* 938 * Ensure the target directory is not a child of the 939 * directory being moved. Otherwise, we'd end up 940 * with stale nodes. 941 */ 942 n = tdnode; 943 /* 944 * TMPFS_LOCK guaranties that no nodes are freed while 945 * traversing the list. Nodes can only be marked as 946 * removed: tn_parent == NULL. 947 */ 948 TMPFS_LOCK(tmp); 949 TMPFS_NODE_LOCK(n); 950 while (n != n->tn_dir.tn_parent) { 951 struct tmpfs_node *parent; 952 953 if (n == fnode) { 954 TMPFS_NODE_UNLOCK(n); 955 TMPFS_UNLOCK(tmp); 956 error = EINVAL; 957 if (newname != NULL) 958 free(newname, M_TMPFSNAME); 959 goto out_locked; 960 } 961 parent = n->tn_dir.tn_parent; 962 TMPFS_NODE_UNLOCK(n); 963 if (parent == NULL) { 964 n = NULL; 965 break; 966 } 967 TMPFS_NODE_LOCK(parent); 968 if (parent->tn_dir.tn_parent == NULL) { 969 TMPFS_NODE_UNLOCK(parent); 970 n = NULL; 971 break; 972 } 973 n = parent; 974 } 975 TMPFS_UNLOCK(tmp); 976 if (n == NULL) { 977 error = EINVAL; 978 if (newname != NULL) 979 free(newname, M_TMPFSNAME); 980 goto out_locked; 981 } 982 TMPFS_NODE_UNLOCK(n); 983 984 /* Adjust the parent pointer. */ 985 TMPFS_VALIDATE_DIR(fnode); 986 TMPFS_NODE_LOCK(de->td_node); 987 de->td_node->tn_dir.tn_parent = tdnode; 988 TMPFS_NODE_UNLOCK(de->td_node); 989 990 /* 991 * As a result of changing the target of the '..' 992 * entry, the link count of the source and target 993 * directories has to be adjusted. 994 */ 995 TMPFS_NODE_LOCK(tdnode); 996 TMPFS_ASSERT_LOCKED(tdnode); 997 tdnode->tn_links++; 998 TMPFS_NODE_UNLOCK(tdnode); 999 1000 TMPFS_NODE_LOCK(fdnode); 1001 TMPFS_ASSERT_LOCKED(fdnode); 1002 fdnode->tn_links--; 1003 TMPFS_NODE_UNLOCK(fdnode); 1004 } 1005 } 1006 1007 /* 1008 * Do the move: just remove the entry from the source directory 1009 * and insert it into the target one. 1010 */ 1011 tmpfs_dir_detach(fdvp, de); 1012 1013 if (fcnp->cn_flags & DOWHITEOUT) 1014 tmpfs_dir_whiteout_add(fdvp, fcnp); 1015 if (tcnp->cn_flags & ISWHITEOUT) 1016 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1017 1018 /* 1019 * If the name has changed, we need to make it effective by changing 1020 * it in the directory entry. 1021 */ 1022 if (newname != NULL) { 1023 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1024 1025 free(de->ud.td_name, M_TMPFSNAME); 1026 de->ud.td_name = newname; 1027 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 1028 1029 fnode->tn_status |= TMPFS_NODE_CHANGED; 1030 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1031 } 1032 1033 /* 1034 * If we are overwriting an entry, we have to remove the old one 1035 * from the target directory. 1036 */ 1037 if (tvp != NULL) { 1038 struct tmpfs_dirent *tde; 1039 1040 /* Remove the old entry from the target directory. */ 1041 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1042 tmpfs_dir_detach(tdvp, tde); 1043 1044 /* 1045 * Free the directory entry we just deleted. Note that the 1046 * node referred by it will not be removed until the vnode is 1047 * really reclaimed. 1048 */ 1049 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1050 } 1051 1052 tmpfs_dir_attach(tdvp, de); 1053 1054 if (tmpfs_use_nc(fvp)) { 1055 cache_purge(fvp); 1056 if (tvp != NULL) 1057 cache_purge(tvp); 1058 cache_purge_negative(tdvp); 1059 } 1060 1061 error = 0; 1062 1063 out_locked: 1064 if (fdvp != tdvp && fdvp != tvp) 1065 VOP_UNLOCK(fdvp, 0); 1066 1067 out: 1068 /* 1069 * Release target nodes. 1070 * XXX: I don't understand when tdvp can be the same as tvp, but 1071 * other code takes care of this... 1072 */ 1073 if (tdvp == tvp) 1074 vrele(tdvp); 1075 else 1076 vput(tdvp); 1077 if (tvp != NULL) 1078 vput(tvp); 1079 1080 /* Release source nodes. */ 1081 vrele(fdvp); 1082 vrele(fvp); 1083 1084 return (error); 1085 } 1086 1087 static int 1088 tmpfs_mkdir(struct vop_mkdir_args *v) 1089 { 1090 struct vnode *dvp = v->a_dvp; 1091 struct vnode **vpp = v->a_vpp; 1092 struct componentname *cnp = v->a_cnp; 1093 struct vattr *vap = v->a_vap; 1094 1095 MPASS(vap->va_type == VDIR); 1096 1097 return (tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL)); 1098 } 1099 1100 static int 1101 tmpfs_rmdir(struct vop_rmdir_args *v) 1102 { 1103 struct vnode *dvp = v->a_dvp; 1104 struct vnode *vp = v->a_vp; 1105 1106 int error; 1107 struct tmpfs_dirent *de; 1108 struct tmpfs_mount *tmp; 1109 struct tmpfs_node *dnode; 1110 struct tmpfs_node *node; 1111 1112 MPASS(VOP_ISLOCKED(dvp)); 1113 MPASS(VOP_ISLOCKED(vp)); 1114 1115 tmp = VFS_TO_TMPFS(dvp->v_mount); 1116 dnode = VP_TO_TMPFS_DIR(dvp); 1117 node = VP_TO_TMPFS_DIR(vp); 1118 1119 /* Directories with more than two entries ('.' and '..') cannot be 1120 * removed. */ 1121 if (node->tn_size > 0) { 1122 error = ENOTEMPTY; 1123 goto out; 1124 } 1125 1126 if ((dnode->tn_flags & APPEND) 1127 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1128 error = EPERM; 1129 goto out; 1130 } 1131 1132 /* This invariant holds only if we are not trying to remove "..". 1133 * We checked for that above so this is safe now. */ 1134 MPASS(node->tn_dir.tn_parent == dnode); 1135 1136 /* Get the directory entry associated with node (vp). This was 1137 * filled by tmpfs_lookup while looking up the entry. */ 1138 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1139 MPASS(TMPFS_DIRENT_MATCHES(de, 1140 v->a_cnp->cn_nameptr, 1141 v->a_cnp->cn_namelen)); 1142 1143 /* Check flags to see if we are allowed to remove the directory. */ 1144 if ((dnode->tn_flags & APPEND) != 0 || 1145 (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) != 0) { 1146 error = EPERM; 1147 goto out; 1148 } 1149 1150 1151 /* Detach the directory entry from the directory (dnode). */ 1152 tmpfs_dir_detach(dvp, de); 1153 if (v->a_cnp->cn_flags & DOWHITEOUT) 1154 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1155 1156 /* No vnode should be allocated for this entry from this point */ 1157 TMPFS_NODE_LOCK(node); 1158 node->tn_links--; 1159 node->tn_dir.tn_parent = NULL; 1160 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1161 TMPFS_NODE_MODIFIED; 1162 1163 TMPFS_NODE_UNLOCK(node); 1164 1165 TMPFS_NODE_LOCK(dnode); 1166 dnode->tn_links--; 1167 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | 1168 TMPFS_NODE_MODIFIED; 1169 TMPFS_NODE_UNLOCK(dnode); 1170 1171 if (tmpfs_use_nc(dvp)) { 1172 cache_purge(dvp); 1173 cache_purge(vp); 1174 } 1175 1176 /* Free the directory entry we just deleted. Note that the node 1177 * referred by it will not be removed until the vnode is really 1178 * reclaimed. */ 1179 tmpfs_free_dirent(tmp, de); 1180 1181 /* Release the deleted vnode (will destroy the node, notify 1182 * interested parties and clean it from the cache). */ 1183 1184 dnode->tn_status |= TMPFS_NODE_CHANGED; 1185 tmpfs_update(dvp); 1186 1187 error = 0; 1188 1189 out: 1190 return (error); 1191 } 1192 1193 static int 1194 tmpfs_symlink(struct vop_symlink_args *v) 1195 { 1196 struct vnode *dvp = v->a_dvp; 1197 struct vnode **vpp = v->a_vpp; 1198 struct componentname *cnp = v->a_cnp; 1199 struct vattr *vap = v->a_vap; 1200 char *target = v->a_target; 1201 1202 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1203 MPASS(vap->va_type == VLNK); 1204 #else 1205 vap->va_type = VLNK; 1206 #endif 1207 1208 return (tmpfs_alloc_file(dvp, vpp, vap, cnp, target)); 1209 } 1210 1211 static int 1212 tmpfs_readdir(struct vop_readdir_args *va) 1213 { 1214 struct vnode *vp; 1215 struct uio *uio; 1216 struct tmpfs_mount *tm; 1217 struct tmpfs_node *node; 1218 u_long **cookies; 1219 int *eofflag, *ncookies; 1220 ssize_t startresid; 1221 int error, maxcookies; 1222 1223 vp = va->a_vp; 1224 uio = va->a_uio; 1225 eofflag = va->a_eofflag; 1226 cookies = va->a_cookies; 1227 ncookies = va->a_ncookies; 1228 1229 /* This operation only makes sense on directory nodes. */ 1230 if (vp->v_type != VDIR) 1231 return (ENOTDIR); 1232 1233 maxcookies = 0; 1234 node = VP_TO_TMPFS_DIR(vp); 1235 tm = VFS_TO_TMPFS(vp->v_mount); 1236 1237 startresid = uio->uio_resid; 1238 1239 /* Allocate cookies for NFS and compat modules. */ 1240 if (cookies != NULL && ncookies != NULL) { 1241 maxcookies = howmany(node->tn_size, 1242 sizeof(struct tmpfs_dirent)) + 2; 1243 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1244 M_WAITOK); 1245 *ncookies = 0; 1246 } 1247 1248 if (cookies == NULL) 1249 error = tmpfs_dir_getdents(tm, node, uio, 0, NULL, NULL); 1250 else 1251 error = tmpfs_dir_getdents(tm, node, uio, maxcookies, *cookies, 1252 ncookies); 1253 1254 /* Buffer was filled without hitting EOF. */ 1255 if (error == EJUSTRETURN) 1256 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1257 1258 if (error != 0 && cookies != NULL && ncookies != NULL) { 1259 free(*cookies, M_TEMP); 1260 *cookies = NULL; 1261 *ncookies = 0; 1262 } 1263 1264 if (eofflag != NULL) 1265 *eofflag = 1266 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1267 1268 return (error); 1269 } 1270 1271 static int 1272 tmpfs_readlink(struct vop_readlink_args *v) 1273 { 1274 struct vnode *vp = v->a_vp; 1275 struct uio *uio = v->a_uio; 1276 1277 int error; 1278 struct tmpfs_node *node; 1279 1280 MPASS(uio->uio_offset == 0); 1281 MPASS(vp->v_type == VLNK); 1282 1283 node = VP_TO_TMPFS_NODE(vp); 1284 1285 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1286 uio); 1287 tmpfs_set_status(VFS_TO_TMPFS(vp->v_mount), node, TMPFS_NODE_ACCESSED); 1288 1289 return (error); 1290 } 1291 1292 static int 1293 tmpfs_inactive(struct vop_inactive_args *v) 1294 { 1295 struct vnode *vp; 1296 struct tmpfs_node *node; 1297 1298 vp = v->a_vp; 1299 node = VP_TO_TMPFS_NODE(vp); 1300 if (node->tn_links == 0) 1301 vrecycle(vp); 1302 else 1303 tmpfs_check_mtime(vp); 1304 return (0); 1305 } 1306 1307 int 1308 tmpfs_reclaim(struct vop_reclaim_args *v) 1309 { 1310 struct vnode *vp; 1311 struct tmpfs_mount *tmp; 1312 struct tmpfs_node *node; 1313 bool unlock, tm_locked; 1314 1315 vp = v->a_vp; 1316 node = VP_TO_TMPFS_NODE(vp); 1317 tmp = VFS_TO_TMPFS(vp->v_mount); 1318 tm_locked = false; 1319 1320 if (vp->v_type == VREG) 1321 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1322 else 1323 vnode_destroy_vobject(vp); 1324 vp->v_object = NULL; 1325 if (tmpfs_use_nc(vp)) 1326 cache_purge(vp); 1327 1328 relock: 1329 TMPFS_NODE_LOCK(node); 1330 if (!tm_locked && node->tn_links == 0 && 1331 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1332 TMPFS_NODE_UNLOCK(node); 1333 TMPFS_LOCK(tmp); 1334 tm_locked = true; 1335 goto relock; 1336 } 1337 tmpfs_free_vp(vp); 1338 1339 /* 1340 * If the node referenced by this vnode was deleted by the user, 1341 * we must free its associated data structures (now that the vnode 1342 * is being reclaimed). 1343 */ 1344 if (node->tn_links == 0 && 1345 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1346 MPASS(tm_locked); 1347 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1348 unlock = !tmpfs_free_node_locked(tmp, node, true); 1349 } else { 1350 unlock = true; 1351 } 1352 1353 if (unlock) { 1354 TMPFS_NODE_UNLOCK(node); 1355 if (tm_locked) 1356 TMPFS_UNLOCK(tmp); 1357 } 1358 1359 MPASS(vp->v_data == NULL); 1360 return (0); 1361 } 1362 1363 int 1364 tmpfs_print(struct vop_print_args *v) 1365 { 1366 struct vnode *vp = v->a_vp; 1367 1368 struct tmpfs_node *node; 1369 1370 node = VP_TO_TMPFS_NODE(vp); 1371 1372 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %jd\n", 1373 node, node->tn_flags, (uintmax_t)node->tn_links); 1374 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1375 node->tn_mode, node->tn_uid, node->tn_gid, 1376 (intmax_t)node->tn_size, node->tn_status); 1377 1378 if (vp->v_type == VFIFO) 1379 fifo_printinfo(vp); 1380 1381 printf("\n"); 1382 1383 return (0); 1384 } 1385 1386 int 1387 tmpfs_pathconf(struct vop_pathconf_args *v) 1388 { 1389 struct vnode *vp = v->a_vp; 1390 int name = v->a_name; 1391 long *retval = v->a_retval; 1392 1393 int error; 1394 1395 error = 0; 1396 1397 switch (name) { 1398 case _PC_LINK_MAX: 1399 *retval = TMPFS_LINK_MAX; 1400 break; 1401 1402 case _PC_NAME_MAX: 1403 *retval = NAME_MAX; 1404 break; 1405 1406 case _PC_PIPE_BUF: 1407 if (vp->v_type == VDIR || vp->v_type == VFIFO) 1408 *retval = PIPE_BUF; 1409 else 1410 error = EINVAL; 1411 break; 1412 1413 case _PC_CHOWN_RESTRICTED: 1414 *retval = 1; 1415 break; 1416 1417 case _PC_NO_TRUNC: 1418 *retval = 1; 1419 break; 1420 1421 case _PC_SYNC_IO: 1422 *retval = 1; 1423 break; 1424 1425 case _PC_FILESIZEBITS: 1426 *retval = 64; 1427 break; 1428 1429 default: 1430 error = vop_stdpathconf(v); 1431 } 1432 1433 return (error); 1434 } 1435 1436 static int 1437 tmpfs_vptofh(struct vop_vptofh_args *ap) 1438 /* 1439 vop_vptofh { 1440 IN struct vnode *a_vp; 1441 IN struct fid *a_fhp; 1442 }; 1443 */ 1444 { 1445 struct tmpfs_fid_data tfd; 1446 struct tmpfs_node *node; 1447 struct fid *fhp; 1448 1449 node = VP_TO_TMPFS_NODE(ap->a_vp); 1450 fhp = ap->a_fhp; 1451 fhp->fid_len = sizeof(tfd); 1452 1453 /* 1454 * Copy into fid_data from the stack to avoid unaligned pointer use. 1455 * See the comment in sys/mount.h on struct fid for details. 1456 */ 1457 tfd.tfd_id = node->tn_id; 1458 tfd.tfd_gen = node->tn_gen; 1459 memcpy(fhp->fid_data, &tfd, fhp->fid_len); 1460 1461 return (0); 1462 } 1463 1464 static int 1465 tmpfs_whiteout(struct vop_whiteout_args *ap) 1466 { 1467 struct vnode *dvp = ap->a_dvp; 1468 struct componentname *cnp = ap->a_cnp; 1469 struct tmpfs_dirent *de; 1470 1471 switch (ap->a_flags) { 1472 case LOOKUP: 1473 return (0); 1474 case CREATE: 1475 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1476 if (de != NULL) 1477 return (de->td_node == NULL ? 0 : EEXIST); 1478 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1479 case DELETE: 1480 tmpfs_dir_whiteout_remove(dvp, cnp); 1481 return (0); 1482 default: 1483 panic("tmpfs_whiteout: unknown op"); 1484 } 1485 } 1486 1487 static int 1488 tmpfs_vptocnp_dir(struct tmpfs_node *tn, struct tmpfs_node *tnp, 1489 struct tmpfs_dirent **pde) 1490 { 1491 struct tmpfs_dir_cursor dc; 1492 struct tmpfs_dirent *de; 1493 1494 for (de = tmpfs_dir_first(tnp, &dc); de != NULL; 1495 de = tmpfs_dir_next(tnp, &dc)) { 1496 if (de->td_node == tn) { 1497 *pde = de; 1498 return (0); 1499 } 1500 } 1501 return (ENOENT); 1502 } 1503 1504 static int 1505 tmpfs_vptocnp_fill(struct vnode *vp, struct tmpfs_node *tn, 1506 struct tmpfs_node *tnp, char *buf, int *buflen, struct vnode **dvp) 1507 { 1508 struct tmpfs_dirent *de; 1509 int error, i; 1510 1511 error = vn_vget_ino_gen(vp, tmpfs_vn_get_ino_alloc, tnp, LK_SHARED, 1512 dvp); 1513 if (error != 0) 1514 return (error); 1515 error = tmpfs_vptocnp_dir(tn, tnp, &de); 1516 if (error == 0) { 1517 i = *buflen; 1518 i -= de->td_namelen; 1519 if (i < 0) { 1520 error = ENOMEM; 1521 } else { 1522 bcopy(de->ud.td_name, buf + i, de->td_namelen); 1523 *buflen = i; 1524 } 1525 } 1526 if (error == 0) { 1527 if (vp != *dvp) 1528 VOP_UNLOCK(*dvp, 0); 1529 } else { 1530 if (vp != *dvp) 1531 vput(*dvp); 1532 else 1533 vrele(vp); 1534 } 1535 return (error); 1536 } 1537 1538 static int 1539 tmpfs_vptocnp(struct vop_vptocnp_args *ap) 1540 { 1541 struct vnode *vp, **dvp; 1542 struct tmpfs_node *tn, *tnp, *tnp1; 1543 struct tmpfs_dirent *de; 1544 struct tmpfs_mount *tm; 1545 char *buf; 1546 int *buflen; 1547 int error; 1548 1549 vp = ap->a_vp; 1550 dvp = ap->a_vpp; 1551 buf = ap->a_buf; 1552 buflen = ap->a_buflen; 1553 1554 tm = VFS_TO_TMPFS(vp->v_mount); 1555 tn = VP_TO_TMPFS_NODE(vp); 1556 if (tn->tn_type == VDIR) { 1557 tnp = tn->tn_dir.tn_parent; 1558 if (tnp == NULL) 1559 return (ENOENT); 1560 tmpfs_ref_node(tnp); 1561 error = tmpfs_vptocnp_fill(vp, tn, tn->tn_dir.tn_parent, buf, 1562 buflen, dvp); 1563 tmpfs_free_node(tm, tnp); 1564 return (error); 1565 } 1566 restart: 1567 TMPFS_LOCK(tm); 1568 restart_locked: 1569 LIST_FOREACH_SAFE(tnp, &tm->tm_nodes_used, tn_entries, tnp1) { 1570 if (tnp->tn_type != VDIR) 1571 continue; 1572 TMPFS_NODE_LOCK(tnp); 1573 tmpfs_ref_node_locked(tnp); 1574 1575 /* 1576 * tn_vnode cannot be instantiated while we hold the 1577 * node lock, so the directory cannot be changed while 1578 * we iterate over it. Do this to avoid instantiating 1579 * vnode for directories which cannot point to our 1580 * node. 1581 */ 1582 error = tnp->tn_vnode == NULL ? tmpfs_vptocnp_dir(tn, tnp, 1583 &de) : 0; 1584 1585 if (error == 0) { 1586 TMPFS_NODE_UNLOCK(tnp); 1587 TMPFS_UNLOCK(tm); 1588 error = tmpfs_vptocnp_fill(vp, tn, tnp, buf, buflen, 1589 dvp); 1590 if (error == 0) { 1591 tmpfs_free_node(tm, tnp); 1592 return (0); 1593 } 1594 if ((vp->v_iflag & VI_DOOMED) != 0) { 1595 tmpfs_free_node(tm, tnp); 1596 return (ENOENT); 1597 } 1598 TMPFS_LOCK(tm); 1599 TMPFS_NODE_LOCK(tnp); 1600 } 1601 if (tmpfs_free_node_locked(tm, tnp, false)) { 1602 goto restart; 1603 } else { 1604 KASSERT(tnp->tn_refcount > 0, 1605 ("node %p refcount zero", tnp)); 1606 if (tnp->tn_attached) { 1607 tnp1 = LIST_NEXT(tnp, tn_entries); 1608 TMPFS_NODE_UNLOCK(tnp); 1609 } else { 1610 TMPFS_NODE_UNLOCK(tnp); 1611 goto restart_locked; 1612 } 1613 } 1614 } 1615 TMPFS_UNLOCK(tm); 1616 return (ENOENT); 1617 } 1618 1619 /* 1620 * Vnode operations vector used for files stored in a tmpfs file system. 1621 */ 1622 struct vop_vector tmpfs_vnodeop_entries = { 1623 .vop_default = &default_vnodeops, 1624 .vop_lookup = vfs_cache_lookup, 1625 .vop_cachedlookup = tmpfs_cached_lookup, 1626 .vop_create = tmpfs_create, 1627 .vop_mknod = tmpfs_mknod, 1628 .vop_open = tmpfs_open, 1629 .vop_close = tmpfs_close, 1630 .vop_access = tmpfs_access, 1631 .vop_getattr = tmpfs_getattr, 1632 .vop_setattr = tmpfs_setattr, 1633 .vop_read = tmpfs_read, 1634 .vop_write = tmpfs_write, 1635 .vop_fsync = tmpfs_fsync, 1636 .vop_remove = tmpfs_remove, 1637 .vop_link = tmpfs_link, 1638 .vop_rename = tmpfs_rename, 1639 .vop_mkdir = tmpfs_mkdir, 1640 .vop_rmdir = tmpfs_rmdir, 1641 .vop_symlink = tmpfs_symlink, 1642 .vop_readdir = tmpfs_readdir, 1643 .vop_readlink = tmpfs_readlink, 1644 .vop_inactive = tmpfs_inactive, 1645 .vop_reclaim = tmpfs_reclaim, 1646 .vop_print = tmpfs_print, 1647 .vop_pathconf = tmpfs_pathconf, 1648 .vop_vptofh = tmpfs_vptofh, 1649 .vop_whiteout = tmpfs_whiteout, 1650 .vop_bmap = VOP_EOPNOTSUPP, 1651 .vop_vptocnp = tmpfs_vptocnp, 1652 }; 1653 1654 /* 1655 * Same vector for mounts which do not use namecache. 1656 */ 1657 struct vop_vector tmpfs_vnodeop_nonc_entries = { 1658 .vop_default = &tmpfs_vnodeop_entries, 1659 .vop_lookup = tmpfs_lookup, 1660 };
Cache object: 8e733d12ac4e6c74f8b717ee79c8220b
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]