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/file.h> 46 #include <sys/limits.h> 47 #include <sys/lockf.h> 48 #include <sys/lock.h> 49 #include <sys/mount.h> 50 #include <sys/namei.h> 51 #include <sys/priv.h> 52 #include <sys/proc.h> 53 #include <sys/rwlock.h> 54 #include <sys/sched.h> 55 #include <sys/stat.h> 56 #include <sys/sysctl.h> 57 #include <sys/unistd.h> 58 #include <sys/vnode.h> 59 #include <sys/smr.h> 60 #include <security/audit/audit.h> 61 #include <security/mac/mac_framework.h> 62 63 #include <vm/vm.h> 64 #include <vm/vm_param.h> 65 #include <vm/vm_object.h> 66 67 #include <fs/tmpfs/tmpfs_vnops.h> 68 #include <fs/tmpfs/tmpfs.h> 69 70 SYSCTL_DECL(_vfs_tmpfs); 71 VFS_SMR_DECLARE; 72 73 static volatile int tmpfs_rename_restarts; 74 SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD, 75 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0, 76 "Times rename had to restart due to lock contention"); 77 78 static int 79 tmpfs_vn_get_ino_alloc(struct mount *mp, void *arg, int lkflags, 80 struct vnode **rvp) 81 { 82 83 return (tmpfs_alloc_vp(mp, arg, lkflags, rvp)); 84 } 85 86 static int 87 tmpfs_lookup1(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp) 88 { 89 struct tmpfs_dirent *de; 90 struct tmpfs_node *dnode, *pnode; 91 struct tmpfs_mount *tm; 92 int error; 93 94 /* Caller assumes responsibility for ensuring access (VEXEC). */ 95 dnode = VP_TO_TMPFS_DIR(dvp); 96 *vpp = NULLVP; 97 98 /* We cannot be requesting the parent directory of the root node. */ 99 MPASS(IMPLIES(dnode->tn_type == VDIR && 100 dnode->tn_dir.tn_parent == dnode, 101 !(cnp->cn_flags & ISDOTDOT))); 102 103 TMPFS_ASSERT_LOCKED(dnode); 104 if (dnode->tn_dir.tn_parent == NULL) { 105 error = ENOENT; 106 goto out; 107 } 108 if (cnp->cn_flags & ISDOTDOT) { 109 tm = VFS_TO_TMPFS(dvp->v_mount); 110 pnode = dnode->tn_dir.tn_parent; 111 tmpfs_ref_node(pnode); 112 error = vn_vget_ino_gen(dvp, tmpfs_vn_get_ino_alloc, 113 pnode, cnp->cn_lkflags, vpp); 114 tmpfs_free_node(tm, pnode); 115 if (error != 0) 116 goto out; 117 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 118 VREF(dvp); 119 *vpp = dvp; 120 error = 0; 121 } else { 122 de = tmpfs_dir_lookup(dnode, NULL, cnp); 123 if (de != NULL && de->td_node == NULL) 124 cnp->cn_flags |= ISWHITEOUT; 125 if (de == NULL || de->td_node == NULL) { 126 /* 127 * The entry was not found in the directory. 128 * This is OK if we are creating or renaming an 129 * entry and are working on the last component of 130 * the path name. 131 */ 132 if ((cnp->cn_flags & ISLASTCN) && 133 (cnp->cn_nameiop == CREATE || \ 134 cnp->cn_nameiop == RENAME || 135 (cnp->cn_nameiop == DELETE && 136 cnp->cn_flags & DOWHITEOUT && 137 cnp->cn_flags & ISWHITEOUT))) { 138 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 139 cnp->cn_thread); 140 if (error != 0) 141 goto out; 142 143 /* 144 * Keep the component name in the buffer for 145 * future uses. 146 */ 147 cnp->cn_flags |= SAVENAME; 148 149 error = EJUSTRETURN; 150 } else 151 error = ENOENT; 152 } else { 153 struct tmpfs_node *tnode; 154 155 /* 156 * The entry was found, so get its associated 157 * tmpfs_node. 158 */ 159 tnode = de->td_node; 160 161 /* 162 * If we are not at the last path component and 163 * found a non-directory or non-link entry (which 164 * may itself be pointing to a directory), raise 165 * an error. 166 */ 167 if ((tnode->tn_type != VDIR && 168 tnode->tn_type != VLNK) && 169 !(cnp->cn_flags & ISLASTCN)) { 170 error = ENOTDIR; 171 goto out; 172 } 173 174 /* 175 * If we are deleting or renaming the entry, keep 176 * track of its tmpfs_dirent so that it can be 177 * easily deleted later. 178 */ 179 if ((cnp->cn_flags & ISLASTCN) && 180 (cnp->cn_nameiop == DELETE || 181 cnp->cn_nameiop == RENAME)) { 182 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 183 cnp->cn_thread); 184 if (error != 0) 185 goto out; 186 187 /* Allocate a new vnode on the matching entry. */ 188 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 189 cnp->cn_lkflags, vpp); 190 if (error != 0) 191 goto out; 192 193 if ((dnode->tn_mode & S_ISTXT) && 194 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, 195 cnp->cn_thread) && VOP_ACCESS(*vpp, VADMIN, 196 cnp->cn_cred, cnp->cn_thread)) { 197 error = EPERM; 198 vput(*vpp); 199 *vpp = NULL; 200 goto out; 201 } 202 cnp->cn_flags |= SAVENAME; 203 } else { 204 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 205 cnp->cn_lkflags, vpp); 206 if (error != 0) 207 goto out; 208 } 209 } 210 } 211 212 /* 213 * Store the result of this lookup in the cache. Avoid this if the 214 * request was for creation, as it does not improve timings on 215 * emprical tests. 216 */ 217 if ((cnp->cn_flags & MAKEENTRY) != 0 && tmpfs_use_nc(dvp)) 218 cache_enter(dvp, *vpp, cnp); 219 220 out: 221 /* 222 * If there were no errors, *vpp cannot be null and it must be 223 * locked. 224 */ 225 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 226 227 return (error); 228 } 229 230 static int 231 tmpfs_cached_lookup(struct vop_cachedlookup_args *v) 232 { 233 234 return (tmpfs_lookup1(v->a_dvp, v->a_vpp, v->a_cnp)); 235 } 236 237 static int 238 tmpfs_lookup(struct vop_lookup_args *v) 239 { 240 struct vnode *dvp = v->a_dvp; 241 struct vnode **vpp = v->a_vpp; 242 struct componentname *cnp = v->a_cnp; 243 int error; 244 245 /* Check accessibility of requested node as a first step. */ 246 error = vn_dir_check_exec(dvp, cnp); 247 if (error != 0) 248 return (error); 249 250 return (tmpfs_lookup1(dvp, vpp, cnp)); 251 } 252 253 static int 254 tmpfs_create(struct vop_create_args *v) 255 { 256 struct vnode *dvp = v->a_dvp; 257 struct vnode **vpp = v->a_vpp; 258 struct componentname *cnp = v->a_cnp; 259 struct vattr *vap = v->a_vap; 260 int error; 261 262 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 263 264 error = tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 265 if (error == 0 && (cnp->cn_flags & MAKEENTRY) != 0 && tmpfs_use_nc(dvp)) 266 cache_enter(dvp, *vpp, cnp); 267 return (error); 268 } 269 270 static int 271 tmpfs_mknod(struct vop_mknod_args *v) 272 { 273 struct vnode *dvp = v->a_dvp; 274 struct vnode **vpp = v->a_vpp; 275 struct componentname *cnp = v->a_cnp; 276 struct vattr *vap = v->a_vap; 277 278 if (vap->va_type != VBLK && vap->va_type != VCHR && 279 vap->va_type != VFIFO) 280 return EINVAL; 281 282 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 283 } 284 285 struct fileops tmpfs_fnops; 286 287 static int 288 tmpfs_open(struct vop_open_args *v) 289 { 290 struct vnode *vp; 291 struct tmpfs_node *node; 292 struct file *fp; 293 int error, mode; 294 295 vp = v->a_vp; 296 mode = v->a_mode; 297 node = VP_TO_TMPFS_NODE(vp); 298 299 /* 300 * The file is still active but all its names have been removed 301 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 302 * it is about to die. 303 */ 304 if (node->tn_links < 1) 305 return (ENOENT); 306 307 /* If the file is marked append-only, deny write requests. */ 308 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 309 error = EPERM; 310 else { 311 error = 0; 312 /* For regular files, the call below is nop. */ 313 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags & 314 OBJ_DEAD) == 0, ("dead object")); 315 vnode_create_vobject(vp, node->tn_size, v->a_td); 316 } 317 318 fp = v->a_fp; 319 MPASS(fp == NULL || fp->f_data == NULL); 320 if (error == 0 && fp != NULL && vp->v_type == VREG) { 321 tmpfs_ref_node(node); 322 finit_vnode(fp, mode, node, &tmpfs_fnops); 323 } 324 325 return (error); 326 } 327 328 static int 329 tmpfs_close(struct vop_close_args *v) 330 { 331 struct vnode *vp = v->a_vp; 332 333 /* Update node times. */ 334 tmpfs_update(vp); 335 336 return (0); 337 } 338 339 int 340 tmpfs_fo_close(struct file *fp, struct thread *td) 341 { 342 struct tmpfs_node *node; 343 344 node = fp->f_data; 345 if (node != NULL) { 346 MPASS(node->tn_type == VREG); 347 tmpfs_free_node(node->tn_reg.tn_tmp, node); 348 } 349 return (vnops.fo_close(fp, td)); 350 } 351 352 /* 353 * VOP_FPLOOKUP_VEXEC routines are subject to special circumstances, see 354 * the comment above cache_fplookup for details. 355 */ 356 int 357 tmpfs_fplookup_vexec(struct vop_fplookup_vexec_args *v) 358 { 359 struct vnode *vp; 360 struct tmpfs_node *node; 361 struct ucred *cred; 362 mode_t all_x, mode; 363 364 vp = v->a_vp; 365 node = VP_TO_TMPFS_NODE_SMR(vp); 366 if (__predict_false(node == NULL)) 367 return (EAGAIN); 368 369 all_x = S_IXUSR | S_IXGRP | S_IXOTH; 370 mode = atomic_load_short(&node->tn_mode); 371 if (__predict_true((mode & all_x) == all_x)) 372 return (0); 373 374 cred = v->a_cred; 375 return (vaccess_vexec_smr(mode, node->tn_uid, node->tn_gid, cred)); 376 } 377 378 int 379 tmpfs_access(struct vop_access_args *v) 380 { 381 struct vnode *vp = v->a_vp; 382 accmode_t accmode = v->a_accmode; 383 struct ucred *cred = v->a_cred; 384 mode_t all_x = S_IXUSR | S_IXGRP | S_IXOTH; 385 int error; 386 struct tmpfs_node *node; 387 388 MPASS(VOP_ISLOCKED(vp)); 389 390 node = VP_TO_TMPFS_NODE(vp); 391 392 /* 393 * Common case path lookup. 394 */ 395 if (__predict_true(accmode == VEXEC && (node->tn_mode & all_x) == all_x)) 396 return (0); 397 398 switch (vp->v_type) { 399 case VDIR: 400 /* FALLTHROUGH */ 401 case VLNK: 402 /* FALLTHROUGH */ 403 case VREG: 404 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 405 error = EROFS; 406 goto out; 407 } 408 break; 409 410 case VBLK: 411 /* FALLTHROUGH */ 412 case VCHR: 413 /* FALLTHROUGH */ 414 case VSOCK: 415 /* FALLTHROUGH */ 416 case VFIFO: 417 break; 418 419 default: 420 error = EINVAL; 421 goto out; 422 } 423 424 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 425 error = EPERM; 426 goto out; 427 } 428 429 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, node->tn_gid, 430 accmode, cred); 431 432 out: 433 MPASS(VOP_ISLOCKED(vp)); 434 435 return (error); 436 } 437 438 int 439 tmpfs_stat(struct vop_stat_args *v) 440 { 441 struct vnode *vp = v->a_vp; 442 struct stat *sb = v->a_sb; 443 vm_object_t obj; 444 struct tmpfs_node *node; 445 int error; 446 447 node = VP_TO_TMPFS_NODE(vp); 448 449 tmpfs_update_getattr(vp); 450 451 error = vop_stat_helper_pre(v); 452 if (__predict_false(error)) 453 return (error); 454 455 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0]; 456 sb->st_ino = node->tn_id; 457 sb->st_mode = node->tn_mode | VTTOIF(vp->v_type); 458 sb->st_nlink = node->tn_links; 459 sb->st_uid = node->tn_uid; 460 sb->st_gid = node->tn_gid; 461 sb->st_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 462 node->tn_rdev : NODEV; 463 sb->st_size = node->tn_size; 464 sb->st_atim.tv_sec = node->tn_atime.tv_sec; 465 sb->st_atim.tv_nsec = node->tn_atime.tv_nsec; 466 sb->st_mtim.tv_sec = node->tn_mtime.tv_sec; 467 sb->st_mtim.tv_nsec = node->tn_mtime.tv_nsec; 468 sb->st_ctim.tv_sec = node->tn_ctime.tv_sec; 469 sb->st_ctim.tv_nsec = node->tn_ctime.tv_nsec; 470 sb->st_birthtim.tv_sec = node->tn_birthtime.tv_sec; 471 sb->st_birthtim.tv_nsec = node->tn_birthtime.tv_nsec; 472 sb->st_blksize = PAGE_SIZE; 473 sb->st_flags = node->tn_flags; 474 sb->st_gen = node->tn_gen; 475 if (vp->v_type == VREG) { 476 obj = node->tn_reg.tn_aobj; 477 sb->st_blocks = (u_quad_t)obj->resident_page_count * PAGE_SIZE; 478 } else 479 sb->st_blocks = node->tn_size; 480 sb->st_blocks /= S_BLKSIZE; 481 return (vop_stat_helper_post(v, error)); 482 } 483 484 int 485 tmpfs_getattr(struct vop_getattr_args *v) 486 { 487 struct vnode *vp = v->a_vp; 488 struct vattr *vap = v->a_vap; 489 vm_object_t obj; 490 struct tmpfs_node *node; 491 492 node = VP_TO_TMPFS_NODE(vp); 493 494 tmpfs_update_getattr(vp); 495 496 vap->va_type = vp->v_type; 497 vap->va_mode = node->tn_mode; 498 vap->va_nlink = node->tn_links; 499 vap->va_uid = node->tn_uid; 500 vap->va_gid = node->tn_gid; 501 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 502 vap->va_fileid = node->tn_id; 503 vap->va_size = node->tn_size; 504 vap->va_blocksize = PAGE_SIZE; 505 vap->va_atime = node->tn_atime; 506 vap->va_mtime = node->tn_mtime; 507 vap->va_ctime = node->tn_ctime; 508 vap->va_birthtime = node->tn_birthtime; 509 vap->va_gen = node->tn_gen; 510 vap->va_flags = node->tn_flags; 511 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 512 node->tn_rdev : NODEV; 513 if (vp->v_type == VREG) { 514 obj = node->tn_reg.tn_aobj; 515 vap->va_bytes = (u_quad_t)obj->resident_page_count * PAGE_SIZE; 516 } else 517 vap->va_bytes = node->tn_size; 518 vap->va_filerev = 0; 519 520 return 0; 521 } 522 523 int 524 tmpfs_setattr(struct vop_setattr_args *v) 525 { 526 struct vnode *vp = v->a_vp; 527 struct vattr *vap = v->a_vap; 528 struct ucred *cred = v->a_cred; 529 struct thread *td = curthread; 530 531 int error; 532 533 MPASS(VOP_ISLOCKED(vp)); 534 ASSERT_VOP_IN_SEQC(vp); 535 536 error = 0; 537 538 /* Abort if any unsettable attribute is given. */ 539 if (vap->va_type != VNON || 540 vap->va_nlink != VNOVAL || 541 vap->va_fsid != VNOVAL || 542 vap->va_fileid != VNOVAL || 543 vap->va_blocksize != VNOVAL || 544 vap->va_gen != VNOVAL || 545 vap->va_rdev != VNOVAL || 546 vap->va_bytes != VNOVAL) 547 error = EINVAL; 548 549 if (error == 0 && (vap->va_flags != VNOVAL)) 550 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 551 552 if (error == 0 && (vap->va_size != VNOVAL)) 553 error = tmpfs_chsize(vp, vap->va_size, cred, td); 554 555 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 556 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 557 558 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 559 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 560 561 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 562 vap->va_atime.tv_nsec != VNOVAL) || 563 (vap->va_mtime.tv_sec != VNOVAL && 564 vap->va_mtime.tv_nsec != VNOVAL) || 565 (vap->va_birthtime.tv_sec != VNOVAL && 566 vap->va_birthtime.tv_nsec != VNOVAL))) 567 error = tmpfs_chtimes(vp, vap, cred, td); 568 569 /* 570 * Update the node times. We give preference to the error codes 571 * generated by this function rather than the ones that may arise 572 * from tmpfs_update. 573 */ 574 tmpfs_update(vp); 575 576 MPASS(VOP_ISLOCKED(vp)); 577 578 return error; 579 } 580 581 static int 582 tmpfs_read(struct vop_read_args *v) 583 { 584 struct vnode *vp; 585 struct uio *uio; 586 struct tmpfs_node *node; 587 588 vp = v->a_vp; 589 if (vp->v_type != VREG) 590 return (EISDIR); 591 uio = v->a_uio; 592 if (uio->uio_offset < 0) 593 return (EINVAL); 594 node = VP_TO_TMPFS_NODE(vp); 595 tmpfs_set_accessed(VFS_TO_TMPFS(vp->v_mount), node); 596 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio)); 597 } 598 599 static int 600 tmpfs_read_pgcache(struct vop_read_pgcache_args *v) 601 { 602 struct vnode *vp; 603 struct tmpfs_node *node; 604 vm_object_t object; 605 off_t size; 606 int error; 607 608 vp = v->a_vp; 609 VNPASS((vn_irflag_read(vp) & VIRF_PGREAD) != 0, vp); 610 611 if (v->a_uio->uio_offset < 0) 612 return (EINVAL); 613 614 error = EJUSTRETURN; 615 vfs_smr_enter(); 616 617 node = VP_TO_TMPFS_NODE_SMR(vp); 618 if (node == NULL) 619 goto out_smr; 620 MPASS(node->tn_type == VREG); 621 MPASS(node->tn_refcount >= 1); 622 object = node->tn_reg.tn_aobj; 623 if (object == NULL) 624 goto out_smr; 625 626 MPASS(object->type == tmpfs_pager_type); 627 MPASS((object->flags & (OBJ_ANON | OBJ_DEAD | OBJ_SWAP)) == 628 OBJ_SWAP); 629 if (!VN_IS_DOOMED(vp)) { 630 /* size cannot become shorter due to rangelock. */ 631 size = node->tn_size; 632 tmpfs_set_accessed(node->tn_reg.tn_tmp, node); 633 vfs_smr_exit(); 634 error = uiomove_object(object, size, v->a_uio); 635 return (error); 636 } 637 out_smr: 638 vfs_smr_exit(); 639 return (error); 640 } 641 642 static int 643 tmpfs_write(struct vop_write_args *v) 644 { 645 struct vnode *vp; 646 struct uio *uio; 647 struct tmpfs_node *node; 648 off_t oldsize; 649 int error, ioflag; 650 mode_t newmode; 651 652 vp = v->a_vp; 653 uio = v->a_uio; 654 ioflag = v->a_ioflag; 655 error = 0; 656 node = VP_TO_TMPFS_NODE(vp); 657 oldsize = node->tn_size; 658 659 if (uio->uio_offset < 0 || vp->v_type != VREG) 660 return (EINVAL); 661 if (uio->uio_resid == 0) 662 return (0); 663 if (ioflag & IO_APPEND) 664 uio->uio_offset = node->tn_size; 665 if (uio->uio_offset + uio->uio_resid > 666 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 667 return (EFBIG); 668 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 669 return (EFBIG); 670 if (uio->uio_offset + uio->uio_resid > node->tn_size) { 671 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 672 FALSE); 673 if (error != 0) 674 goto out; 675 } 676 677 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio); 678 node->tn_status |= TMPFS_NODE_MODIFIED | TMPFS_NODE_CHANGED; 679 node->tn_accessed = true; 680 if (node->tn_mode & (S_ISUID | S_ISGID)) { 681 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID)) { 682 newmode = node->tn_mode & ~(S_ISUID | S_ISGID); 683 vn_seqc_write_begin(vp); 684 atomic_store_short(&node->tn_mode, newmode); 685 vn_seqc_write_end(vp); 686 } 687 } 688 if (error != 0) 689 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 690 691 out: 692 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 693 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 694 695 return (error); 696 } 697 698 static int 699 tmpfs_fsync(struct vop_fsync_args *v) 700 { 701 struct vnode *vp = v->a_vp; 702 703 MPASS(VOP_ISLOCKED(vp)); 704 705 tmpfs_check_mtime(vp); 706 tmpfs_update(vp); 707 708 return 0; 709 } 710 711 static int 712 tmpfs_remove(struct vop_remove_args *v) 713 { 714 struct vnode *dvp = v->a_dvp; 715 struct vnode *vp = v->a_vp; 716 717 int error; 718 struct tmpfs_dirent *de; 719 struct tmpfs_mount *tmp; 720 struct tmpfs_node *dnode; 721 struct tmpfs_node *node; 722 723 MPASS(VOP_ISLOCKED(dvp)); 724 MPASS(VOP_ISLOCKED(vp)); 725 726 if (vp->v_type == VDIR) { 727 error = EISDIR; 728 goto out; 729 } 730 731 dnode = VP_TO_TMPFS_DIR(dvp); 732 node = VP_TO_TMPFS_NODE(vp); 733 tmp = VFS_TO_TMPFS(vp->v_mount); 734 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 735 MPASS(de != NULL); 736 737 /* Files marked as immutable or append-only cannot be deleted. */ 738 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 739 (dnode->tn_flags & APPEND)) { 740 error = EPERM; 741 goto out; 742 } 743 744 /* Remove the entry from the directory; as it is a file, we do not 745 * have to change the number of hard links of the directory. */ 746 tmpfs_dir_detach(dvp, de); 747 if (v->a_cnp->cn_flags & DOWHITEOUT) 748 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 749 750 /* Free the directory entry we just deleted. Note that the node 751 * referred by it will not be removed until the vnode is really 752 * reclaimed. */ 753 tmpfs_free_dirent(tmp, de); 754 755 node->tn_status |= TMPFS_NODE_CHANGED; 756 node->tn_accessed = true; 757 error = 0; 758 759 out: 760 return (error); 761 } 762 763 static int 764 tmpfs_link(struct vop_link_args *v) 765 { 766 struct vnode *dvp = v->a_tdvp; 767 struct vnode *vp = v->a_vp; 768 struct componentname *cnp = v->a_cnp; 769 770 int error; 771 struct tmpfs_dirent *de; 772 struct tmpfs_node *node; 773 774 MPASS(VOP_ISLOCKED(dvp)); 775 MPASS(cnp->cn_flags & HASBUF); 776 MPASS(dvp != vp); /* XXX When can this be false? */ 777 node = VP_TO_TMPFS_NODE(vp); 778 779 /* Ensure that we do not overflow the maximum number of links imposed 780 * by the system. */ 781 MPASS(node->tn_links <= TMPFS_LINK_MAX); 782 if (node->tn_links == TMPFS_LINK_MAX) { 783 error = EMLINK; 784 goto out; 785 } 786 787 /* We cannot create links of files marked immutable or append-only. */ 788 if (node->tn_flags & (IMMUTABLE | APPEND)) { 789 error = EPERM; 790 goto out; 791 } 792 793 /* Allocate a new directory entry to represent the node. */ 794 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 795 cnp->cn_nameptr, cnp->cn_namelen, &de); 796 if (error != 0) 797 goto out; 798 799 /* Insert the new directory entry into the appropriate directory. */ 800 if (cnp->cn_flags & ISWHITEOUT) 801 tmpfs_dir_whiteout_remove(dvp, cnp); 802 tmpfs_dir_attach(dvp, de); 803 804 /* vp link count has changed, so update node times. */ 805 node->tn_status |= TMPFS_NODE_CHANGED; 806 tmpfs_update(vp); 807 808 error = 0; 809 810 out: 811 return error; 812 } 813 814 /* 815 * We acquire all but fdvp locks using non-blocking acquisitions. If we 816 * fail to acquire any lock in the path we will drop all held locks, 817 * acquire the new lock in a blocking fashion, and then release it and 818 * restart the rename. This acquire/release step ensures that we do not 819 * spin on a lock waiting for release. On error release all vnode locks 820 * and decrement references the way tmpfs_rename() would do. 821 */ 822 static int 823 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 824 struct vnode *tdvp, struct vnode **tvpp, 825 struct componentname *fcnp, struct componentname *tcnp) 826 { 827 struct vnode *nvp; 828 struct mount *mp; 829 struct tmpfs_dirent *de; 830 int error, restarts = 0; 831 832 VOP_UNLOCK(tdvp); 833 if (*tvpp != NULL && *tvpp != tdvp) 834 VOP_UNLOCK(*tvpp); 835 mp = fdvp->v_mount; 836 837 relock: 838 restarts += 1; 839 error = vn_lock(fdvp, LK_EXCLUSIVE); 840 if (error) 841 goto releout; 842 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 843 VOP_UNLOCK(fdvp); 844 error = vn_lock(tdvp, LK_EXCLUSIVE); 845 if (error) 846 goto releout; 847 VOP_UNLOCK(tdvp); 848 goto relock; 849 } 850 /* 851 * Re-resolve fvp to be certain it still exists and fetch the 852 * correct vnode. 853 */ 854 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 855 if (de == NULL) { 856 VOP_UNLOCK(fdvp); 857 VOP_UNLOCK(tdvp); 858 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 859 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 860 error = EINVAL; 861 else 862 error = ENOENT; 863 goto releout; 864 } 865 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 866 if (error != 0) { 867 VOP_UNLOCK(fdvp); 868 VOP_UNLOCK(tdvp); 869 if (error != EBUSY) 870 goto releout; 871 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 872 if (error != 0) 873 goto releout; 874 VOP_UNLOCK(nvp); 875 /* 876 * Concurrent rename race. 877 */ 878 if (nvp == tdvp) { 879 vrele(nvp); 880 error = EINVAL; 881 goto releout; 882 } 883 vrele(*fvpp); 884 *fvpp = nvp; 885 goto relock; 886 } 887 vrele(*fvpp); 888 *fvpp = nvp; 889 VOP_UNLOCK(*fvpp); 890 /* 891 * Re-resolve tvp and acquire the vnode lock if present. 892 */ 893 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 894 /* 895 * If tvp disappeared we just carry on. 896 */ 897 if (de == NULL && *tvpp != NULL) { 898 vrele(*tvpp); 899 *tvpp = NULL; 900 } 901 /* 902 * Get the tvp ino if the lookup succeeded. We may have to restart 903 * if the non-blocking acquire fails. 904 */ 905 if (de != NULL) { 906 nvp = NULL; 907 error = tmpfs_alloc_vp(mp, de->td_node, 908 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 909 if (*tvpp != NULL) 910 vrele(*tvpp); 911 *tvpp = nvp; 912 if (error != 0) { 913 VOP_UNLOCK(fdvp); 914 VOP_UNLOCK(tdvp); 915 if (error != EBUSY) 916 goto releout; 917 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 918 &nvp); 919 if (error != 0) 920 goto releout; 921 VOP_UNLOCK(nvp); 922 /* 923 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 924 */ 925 if (nvp == fdvp) { 926 error = ENOTEMPTY; 927 goto releout; 928 } 929 goto relock; 930 } 931 } 932 tmpfs_rename_restarts += restarts; 933 934 return (0); 935 936 releout: 937 vrele(fdvp); 938 vrele(*fvpp); 939 vrele(tdvp); 940 if (*tvpp != NULL) 941 vrele(*tvpp); 942 tmpfs_rename_restarts += restarts; 943 944 return (error); 945 } 946 947 static int 948 tmpfs_rename(struct vop_rename_args *v) 949 { 950 struct vnode *fdvp = v->a_fdvp; 951 struct vnode *fvp = v->a_fvp; 952 struct componentname *fcnp = v->a_fcnp; 953 struct vnode *tdvp = v->a_tdvp; 954 struct vnode *tvp = v->a_tvp; 955 struct componentname *tcnp = v->a_tcnp; 956 char *newname; 957 struct tmpfs_dirent *de; 958 struct tmpfs_mount *tmp; 959 struct tmpfs_node *fdnode; 960 struct tmpfs_node *fnode; 961 struct tmpfs_node *tnode; 962 struct tmpfs_node *tdnode; 963 int error; 964 bool want_seqc_end; 965 966 MPASS(VOP_ISLOCKED(tdvp)); 967 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 968 MPASS(fcnp->cn_flags & HASBUF); 969 MPASS(tcnp->cn_flags & HASBUF); 970 971 want_seqc_end = false; 972 973 /* 974 * Disallow cross-device renames. 975 * XXX Why isn't this done by the caller? 976 */ 977 if (fvp->v_mount != tdvp->v_mount || 978 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 979 error = EXDEV; 980 goto out; 981 } 982 983 /* If source and target are the same file, there is nothing to do. */ 984 if (fvp == tvp) { 985 error = 0; 986 goto out; 987 } 988 989 /* 990 * If we need to move the directory between entries, lock the 991 * source so that we can safely operate on it. 992 */ 993 if (fdvp != tdvp && fdvp != tvp) { 994 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 995 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 996 fcnp, tcnp); 997 if (error != 0) 998 return (error); 999 ASSERT_VOP_ELOCKED(fdvp, 1000 "tmpfs_rename: fdvp not locked"); 1001 ASSERT_VOP_ELOCKED(tdvp, 1002 "tmpfs_rename: tdvp not locked"); 1003 if (tvp != NULL) 1004 ASSERT_VOP_ELOCKED(tvp, 1005 "tmpfs_rename: tvp not locked"); 1006 if (fvp == tvp) { 1007 error = 0; 1008 goto out_locked; 1009 } 1010 } 1011 } 1012 1013 if (tvp != NULL) 1014 vn_seqc_write_begin(tvp); 1015 vn_seqc_write_begin(tdvp); 1016 vn_seqc_write_begin(fvp); 1017 vn_seqc_write_begin(fdvp); 1018 want_seqc_end = true; 1019 1020 tmp = VFS_TO_TMPFS(tdvp->v_mount); 1021 tdnode = VP_TO_TMPFS_DIR(tdvp); 1022 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 1023 fdnode = VP_TO_TMPFS_DIR(fdvp); 1024 fnode = VP_TO_TMPFS_NODE(fvp); 1025 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 1026 1027 /* 1028 * Entry can disappear before we lock fdvp, 1029 * also avoid manipulating '.' and '..' entries. 1030 */ 1031 if (de == NULL) { 1032 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 1033 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 1034 error = EINVAL; 1035 else 1036 error = ENOENT; 1037 goto out_locked; 1038 } 1039 MPASS(de->td_node == fnode); 1040 1041 /* 1042 * If re-naming a directory to another preexisting directory 1043 * ensure that the target directory is empty so that its 1044 * removal causes no side effects. 1045 * Kern_rename guarantees the destination to be a directory 1046 * if the source is one. 1047 */ 1048 if (tvp != NULL) { 1049 MPASS(tnode != NULL); 1050 1051 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1052 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 1053 error = EPERM; 1054 goto out_locked; 1055 } 1056 1057 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1058 if (tnode->tn_size > 0) { 1059 error = ENOTEMPTY; 1060 goto out_locked; 1061 } 1062 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1063 error = ENOTDIR; 1064 goto out_locked; 1065 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1066 error = EISDIR; 1067 goto out_locked; 1068 } else { 1069 MPASS(fnode->tn_type != VDIR && 1070 tnode->tn_type != VDIR); 1071 } 1072 } 1073 1074 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1075 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1076 error = EPERM; 1077 goto out_locked; 1078 } 1079 1080 /* 1081 * Ensure that we have enough memory to hold the new name, if it 1082 * has to be changed. 1083 */ 1084 if (fcnp->cn_namelen != tcnp->cn_namelen || 1085 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1086 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1087 } else 1088 newname = NULL; 1089 1090 /* 1091 * If the node is being moved to another directory, we have to do 1092 * the move. 1093 */ 1094 if (fdnode != tdnode) { 1095 /* 1096 * In case we are moving a directory, we have to adjust its 1097 * parent to point to the new parent. 1098 */ 1099 if (de->td_node->tn_type == VDIR) { 1100 struct tmpfs_node *n; 1101 1102 /* 1103 * Ensure the target directory is not a child of the 1104 * directory being moved. Otherwise, we'd end up 1105 * with stale nodes. 1106 */ 1107 n = tdnode; 1108 /* 1109 * TMPFS_LOCK guaranties that no nodes are freed while 1110 * traversing the list. Nodes can only be marked as 1111 * removed: tn_parent == NULL. 1112 */ 1113 TMPFS_LOCK(tmp); 1114 TMPFS_NODE_LOCK(n); 1115 while (n != n->tn_dir.tn_parent) { 1116 struct tmpfs_node *parent; 1117 1118 if (n == fnode) { 1119 TMPFS_NODE_UNLOCK(n); 1120 TMPFS_UNLOCK(tmp); 1121 error = EINVAL; 1122 if (newname != NULL) 1123 free(newname, M_TMPFSNAME); 1124 goto out_locked; 1125 } 1126 parent = n->tn_dir.tn_parent; 1127 TMPFS_NODE_UNLOCK(n); 1128 if (parent == NULL) { 1129 n = NULL; 1130 break; 1131 } 1132 TMPFS_NODE_LOCK(parent); 1133 if (parent->tn_dir.tn_parent == NULL) { 1134 TMPFS_NODE_UNLOCK(parent); 1135 n = NULL; 1136 break; 1137 } 1138 n = parent; 1139 } 1140 TMPFS_UNLOCK(tmp); 1141 if (n == NULL) { 1142 error = EINVAL; 1143 if (newname != NULL) 1144 free(newname, M_TMPFSNAME); 1145 goto out_locked; 1146 } 1147 TMPFS_NODE_UNLOCK(n); 1148 1149 /* Adjust the parent pointer. */ 1150 TMPFS_VALIDATE_DIR(fnode); 1151 TMPFS_NODE_LOCK(de->td_node); 1152 de->td_node->tn_dir.tn_parent = tdnode; 1153 TMPFS_NODE_UNLOCK(de->td_node); 1154 1155 /* 1156 * As a result of changing the target of the '..' 1157 * entry, the link count of the source and target 1158 * directories has to be adjusted. 1159 */ 1160 TMPFS_NODE_LOCK(tdnode); 1161 TMPFS_ASSERT_LOCKED(tdnode); 1162 tdnode->tn_links++; 1163 TMPFS_NODE_UNLOCK(tdnode); 1164 1165 TMPFS_NODE_LOCK(fdnode); 1166 TMPFS_ASSERT_LOCKED(fdnode); 1167 fdnode->tn_links--; 1168 TMPFS_NODE_UNLOCK(fdnode); 1169 } 1170 } 1171 1172 /* 1173 * Do the move: just remove the entry from the source directory 1174 * and insert it into the target one. 1175 */ 1176 tmpfs_dir_detach(fdvp, de); 1177 1178 if (fcnp->cn_flags & DOWHITEOUT) 1179 tmpfs_dir_whiteout_add(fdvp, fcnp); 1180 if (tcnp->cn_flags & ISWHITEOUT) 1181 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1182 1183 /* 1184 * If the name has changed, we need to make it effective by changing 1185 * it in the directory entry. 1186 */ 1187 if (newname != NULL) { 1188 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1189 1190 free(de->ud.td_name, M_TMPFSNAME); 1191 de->ud.td_name = newname; 1192 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 1193 1194 fnode->tn_status |= TMPFS_NODE_CHANGED; 1195 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1196 } 1197 1198 /* 1199 * If we are overwriting an entry, we have to remove the old one 1200 * from the target directory. 1201 */ 1202 if (tvp != NULL) { 1203 struct tmpfs_dirent *tde; 1204 1205 /* Remove the old entry from the target directory. */ 1206 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1207 tmpfs_dir_detach(tdvp, tde); 1208 1209 /* 1210 * Free the directory entry we just deleted. Note that the 1211 * node referred by it will not be removed until the vnode is 1212 * really reclaimed. 1213 */ 1214 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1215 } 1216 1217 tmpfs_dir_attach(tdvp, de); 1218 1219 if (tmpfs_use_nc(fvp)) { 1220 cache_vop_rename(fdvp, fvp, tdvp, tvp, fcnp, tcnp); 1221 } 1222 1223 error = 0; 1224 1225 out_locked: 1226 if (fdvp != tdvp && fdvp != tvp) 1227 VOP_UNLOCK(fdvp); 1228 1229 out: 1230 if (want_seqc_end) { 1231 if (tvp != NULL) 1232 vn_seqc_write_end(tvp); 1233 vn_seqc_write_end(tdvp); 1234 vn_seqc_write_end(fvp); 1235 vn_seqc_write_end(fdvp); 1236 } 1237 1238 /* 1239 * Release target nodes. 1240 * XXX: I don't understand when tdvp can be the same as tvp, but 1241 * other code takes care of this... 1242 */ 1243 if (tdvp == tvp) 1244 vrele(tdvp); 1245 else 1246 vput(tdvp); 1247 if (tvp != NULL) 1248 vput(tvp); 1249 1250 /* Release source nodes. */ 1251 vrele(fdvp); 1252 vrele(fvp); 1253 1254 return (error); 1255 } 1256 1257 static int 1258 tmpfs_mkdir(struct vop_mkdir_args *v) 1259 { 1260 struct vnode *dvp = v->a_dvp; 1261 struct vnode **vpp = v->a_vpp; 1262 struct componentname *cnp = v->a_cnp; 1263 struct vattr *vap = v->a_vap; 1264 1265 MPASS(vap->va_type == VDIR); 1266 1267 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1268 } 1269 1270 static int 1271 tmpfs_rmdir(struct vop_rmdir_args *v) 1272 { 1273 struct vnode *dvp = v->a_dvp; 1274 struct vnode *vp = v->a_vp; 1275 1276 int error; 1277 struct tmpfs_dirent *de; 1278 struct tmpfs_mount *tmp; 1279 struct tmpfs_node *dnode; 1280 struct tmpfs_node *node; 1281 1282 MPASS(VOP_ISLOCKED(dvp)); 1283 MPASS(VOP_ISLOCKED(vp)); 1284 1285 tmp = VFS_TO_TMPFS(dvp->v_mount); 1286 dnode = VP_TO_TMPFS_DIR(dvp); 1287 node = VP_TO_TMPFS_DIR(vp); 1288 1289 /* Directories with more than two entries ('.' and '..') cannot be 1290 * removed. */ 1291 if (node->tn_size > 0) { 1292 error = ENOTEMPTY; 1293 goto out; 1294 } 1295 1296 if ((dnode->tn_flags & APPEND) 1297 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1298 error = EPERM; 1299 goto out; 1300 } 1301 1302 /* This invariant holds only if we are not trying to remove "..". 1303 * We checked for that above so this is safe now. */ 1304 MPASS(node->tn_dir.tn_parent == dnode); 1305 1306 /* Get the directory entry associated with node (vp). This was 1307 * filled by tmpfs_lookup while looking up the entry. */ 1308 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1309 MPASS(TMPFS_DIRENT_MATCHES(de, 1310 v->a_cnp->cn_nameptr, 1311 v->a_cnp->cn_namelen)); 1312 1313 /* Check flags to see if we are allowed to remove the directory. */ 1314 if ((dnode->tn_flags & APPEND) != 0 || 1315 (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) != 0) { 1316 error = EPERM; 1317 goto out; 1318 } 1319 1320 /* Detach the directory entry from the directory (dnode). */ 1321 tmpfs_dir_detach(dvp, de); 1322 if (v->a_cnp->cn_flags & DOWHITEOUT) 1323 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1324 1325 /* No vnode should be allocated for this entry from this point */ 1326 TMPFS_NODE_LOCK(node); 1327 node->tn_links--; 1328 node->tn_dir.tn_parent = NULL; 1329 node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1330 node->tn_accessed = true; 1331 1332 TMPFS_NODE_UNLOCK(node); 1333 1334 TMPFS_NODE_LOCK(dnode); 1335 dnode->tn_links--; 1336 dnode->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1337 dnode->tn_accessed = true; 1338 TMPFS_NODE_UNLOCK(dnode); 1339 1340 if (tmpfs_use_nc(dvp)) { 1341 cache_vop_rmdir(dvp, vp); 1342 } 1343 1344 /* Free the directory entry we just deleted. Note that the node 1345 * referred by it will not be removed until the vnode is really 1346 * reclaimed. */ 1347 tmpfs_free_dirent(tmp, de); 1348 1349 /* Release the deleted vnode (will destroy the node, notify 1350 * interested parties and clean it from the cache). */ 1351 1352 dnode->tn_status |= TMPFS_NODE_CHANGED; 1353 tmpfs_update(dvp); 1354 1355 error = 0; 1356 1357 out: 1358 return error; 1359 } 1360 1361 static int 1362 tmpfs_symlink(struct vop_symlink_args *v) 1363 { 1364 struct vnode *dvp = v->a_dvp; 1365 struct vnode **vpp = v->a_vpp; 1366 struct componentname *cnp = v->a_cnp; 1367 struct vattr *vap = v->a_vap; 1368 const char *target = v->a_target; 1369 1370 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1371 MPASS(vap->va_type == VLNK); 1372 #else 1373 vap->va_type = VLNK; 1374 #endif 1375 1376 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1377 } 1378 1379 static int 1380 tmpfs_readdir(struct vop_readdir_args *va) 1381 { 1382 struct vnode *vp; 1383 struct uio *uio; 1384 struct tmpfs_mount *tm; 1385 struct tmpfs_node *node; 1386 u_long **cookies; 1387 int *eofflag, *ncookies; 1388 ssize_t startresid; 1389 int error, maxcookies; 1390 1391 vp = va->a_vp; 1392 uio = va->a_uio; 1393 eofflag = va->a_eofflag; 1394 cookies = va->a_cookies; 1395 ncookies = va->a_ncookies; 1396 1397 /* This operation only makes sense on directory nodes. */ 1398 if (vp->v_type != VDIR) 1399 return ENOTDIR; 1400 1401 maxcookies = 0; 1402 node = VP_TO_TMPFS_DIR(vp); 1403 tm = VFS_TO_TMPFS(vp->v_mount); 1404 1405 startresid = uio->uio_resid; 1406 1407 /* Allocate cookies for NFS and compat modules. */ 1408 if (cookies != NULL && ncookies != NULL) { 1409 maxcookies = howmany(node->tn_size, 1410 sizeof(struct tmpfs_dirent)) + 2; 1411 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1412 M_WAITOK); 1413 *ncookies = 0; 1414 } 1415 1416 if (cookies == NULL) 1417 error = tmpfs_dir_getdents(tm, node, uio, 0, NULL, NULL); 1418 else 1419 error = tmpfs_dir_getdents(tm, node, uio, maxcookies, *cookies, 1420 ncookies); 1421 1422 /* Buffer was filled without hitting EOF. */ 1423 if (error == EJUSTRETURN) 1424 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1425 1426 if (error != 0 && cookies != NULL && ncookies != NULL) { 1427 free(*cookies, M_TEMP); 1428 *cookies = NULL; 1429 *ncookies = 0; 1430 } 1431 1432 if (eofflag != NULL) 1433 *eofflag = 1434 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1435 1436 return error; 1437 } 1438 1439 static int 1440 tmpfs_readlink(struct vop_readlink_args *v) 1441 { 1442 struct vnode *vp = v->a_vp; 1443 struct uio *uio = v->a_uio; 1444 1445 int error; 1446 struct tmpfs_node *node; 1447 1448 MPASS(uio->uio_offset == 0); 1449 MPASS(vp->v_type == VLNK); 1450 1451 node = VP_TO_TMPFS_NODE(vp); 1452 1453 error = uiomove(node->tn_link_target, MIN(node->tn_size, uio->uio_resid), 1454 uio); 1455 tmpfs_set_accessed(VFS_TO_TMPFS(vp->v_mount), node); 1456 1457 return (error); 1458 } 1459 1460 /* 1461 * VOP_FPLOOKUP_SYMLINK routines are subject to special circumstances, see 1462 * the comment above cache_fplookup for details. 1463 * 1464 * Check tmpfs_alloc_node for tmpfs-specific synchronisation notes. 1465 */ 1466 static int 1467 tmpfs_fplookup_symlink(struct vop_fplookup_symlink_args *v) 1468 { 1469 struct vnode *vp; 1470 struct tmpfs_node *node; 1471 char *symlink; 1472 1473 vp = v->a_vp; 1474 node = VP_TO_TMPFS_NODE_SMR(vp); 1475 if (__predict_false(node == NULL)) 1476 return (EAGAIN); 1477 if (!atomic_load_char(&node->tn_link_smr)) 1478 return (EAGAIN); 1479 symlink = atomic_load_ptr(&node->tn_link_target); 1480 if (symlink == NULL) 1481 return (EAGAIN); 1482 1483 return (cache_symlink_resolve(v->a_fpl, symlink, node->tn_size)); 1484 } 1485 1486 static int 1487 tmpfs_inactive(struct vop_inactive_args *v) 1488 { 1489 struct vnode *vp; 1490 struct tmpfs_node *node; 1491 1492 vp = v->a_vp; 1493 node = VP_TO_TMPFS_NODE(vp); 1494 if (node->tn_links == 0) 1495 vrecycle(vp); 1496 else 1497 tmpfs_check_mtime(vp); 1498 return (0); 1499 } 1500 1501 static int 1502 tmpfs_need_inactive(struct vop_need_inactive_args *ap) 1503 { 1504 struct vnode *vp; 1505 struct tmpfs_node *node; 1506 struct vm_object *obj; 1507 1508 vp = ap->a_vp; 1509 node = VP_TO_TMPFS_NODE(vp); 1510 if (node->tn_links == 0) 1511 goto need; 1512 if (vp->v_type == VREG) { 1513 obj = vp->v_object; 1514 if (obj->generation != obj->cleangeneration) 1515 goto need; 1516 } 1517 return (0); 1518 need: 1519 return (1); 1520 } 1521 1522 int 1523 tmpfs_reclaim(struct vop_reclaim_args *v) 1524 { 1525 struct vnode *vp; 1526 struct tmpfs_mount *tmp; 1527 struct tmpfs_node *node; 1528 bool unlock; 1529 1530 vp = v->a_vp; 1531 node = VP_TO_TMPFS_NODE(vp); 1532 tmp = VFS_TO_TMPFS(vp->v_mount); 1533 1534 if (vp->v_type == VREG) 1535 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1536 vp->v_object = NULL; 1537 1538 TMPFS_LOCK(tmp); 1539 TMPFS_NODE_LOCK(node); 1540 tmpfs_free_vp(vp); 1541 1542 /* 1543 * If the node referenced by this vnode was deleted by the user, 1544 * we must free its associated data structures (now that the vnode 1545 * is being reclaimed). 1546 */ 1547 unlock = true; 1548 if (node->tn_links == 0 && 1549 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1550 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1551 unlock = !tmpfs_free_node_locked(tmp, node, true); 1552 } 1553 1554 if (unlock) { 1555 TMPFS_NODE_UNLOCK(node); 1556 TMPFS_UNLOCK(tmp); 1557 } 1558 1559 MPASS(vp->v_data == NULL); 1560 return (0); 1561 } 1562 1563 int 1564 tmpfs_print(struct vop_print_args *v) 1565 { 1566 struct vnode *vp = v->a_vp; 1567 1568 struct tmpfs_node *node; 1569 1570 node = VP_TO_TMPFS_NODE(vp); 1571 1572 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %jd\n", 1573 node, node->tn_flags, (uintmax_t)node->tn_links); 1574 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1575 node->tn_mode, node->tn_uid, node->tn_gid, 1576 (intmax_t)node->tn_size, node->tn_status); 1577 1578 if (vp->v_type == VFIFO) 1579 fifo_printinfo(vp); 1580 1581 printf("\n"); 1582 1583 return 0; 1584 } 1585 1586 int 1587 tmpfs_pathconf(struct vop_pathconf_args *v) 1588 { 1589 struct vnode *vp = v->a_vp; 1590 int name = v->a_name; 1591 long *retval = v->a_retval; 1592 1593 int error; 1594 1595 error = 0; 1596 1597 switch (name) { 1598 case _PC_LINK_MAX: 1599 *retval = TMPFS_LINK_MAX; 1600 break; 1601 1602 case _PC_SYMLINK_MAX: 1603 *retval = MAXPATHLEN; 1604 break; 1605 1606 case _PC_NAME_MAX: 1607 *retval = NAME_MAX; 1608 break; 1609 1610 case _PC_PIPE_BUF: 1611 if (vp->v_type == VDIR || vp->v_type == VFIFO) 1612 *retval = PIPE_BUF; 1613 else 1614 error = EINVAL; 1615 break; 1616 1617 case _PC_CHOWN_RESTRICTED: 1618 *retval = 1; 1619 break; 1620 1621 case _PC_NO_TRUNC: 1622 *retval = 1; 1623 break; 1624 1625 case _PC_SYNC_IO: 1626 *retval = 1; 1627 break; 1628 1629 case _PC_FILESIZEBITS: 1630 *retval = 64; 1631 break; 1632 1633 default: 1634 error = vop_stdpathconf(v); 1635 } 1636 1637 return error; 1638 } 1639 1640 static int 1641 tmpfs_vptofh(struct vop_vptofh_args *ap) 1642 /* 1643 vop_vptofh { 1644 IN struct vnode *a_vp; 1645 IN struct fid *a_fhp; 1646 }; 1647 */ 1648 { 1649 struct tmpfs_fid_data tfd; 1650 struct tmpfs_node *node; 1651 struct fid *fhp; 1652 1653 node = VP_TO_TMPFS_NODE(ap->a_vp); 1654 fhp = ap->a_fhp; 1655 fhp->fid_len = sizeof(tfd); 1656 1657 /* 1658 * Copy into fid_data from the stack to avoid unaligned pointer use. 1659 * See the comment in sys/mount.h on struct fid for details. 1660 */ 1661 tfd.tfd_id = node->tn_id; 1662 tfd.tfd_gen = node->tn_gen; 1663 memcpy(fhp->fid_data, &tfd, fhp->fid_len); 1664 1665 return (0); 1666 } 1667 1668 static int 1669 tmpfs_whiteout(struct vop_whiteout_args *ap) 1670 { 1671 struct vnode *dvp = ap->a_dvp; 1672 struct componentname *cnp = ap->a_cnp; 1673 struct tmpfs_dirent *de; 1674 1675 switch (ap->a_flags) { 1676 case LOOKUP: 1677 return (0); 1678 case CREATE: 1679 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1680 if (de != NULL) 1681 return (de->td_node == NULL ? 0 : EEXIST); 1682 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1683 case DELETE: 1684 tmpfs_dir_whiteout_remove(dvp, cnp); 1685 return (0); 1686 default: 1687 panic("tmpfs_whiteout: unknown op"); 1688 } 1689 } 1690 1691 static int 1692 tmpfs_vptocnp_dir(struct tmpfs_node *tn, struct tmpfs_node *tnp, 1693 struct tmpfs_dirent **pde) 1694 { 1695 struct tmpfs_dir_cursor dc; 1696 struct tmpfs_dirent *de; 1697 1698 for (de = tmpfs_dir_first(tnp, &dc); de != NULL; 1699 de = tmpfs_dir_next(tnp, &dc)) { 1700 if (de->td_node == tn) { 1701 *pde = de; 1702 return (0); 1703 } 1704 } 1705 return (ENOENT); 1706 } 1707 1708 static int 1709 tmpfs_vptocnp_fill(struct vnode *vp, struct tmpfs_node *tn, 1710 struct tmpfs_node *tnp, char *buf, size_t *buflen, struct vnode **dvp) 1711 { 1712 struct tmpfs_dirent *de; 1713 int error, i; 1714 1715 error = vn_vget_ino_gen(vp, tmpfs_vn_get_ino_alloc, tnp, LK_SHARED, 1716 dvp); 1717 if (error != 0) 1718 return (error); 1719 error = tmpfs_vptocnp_dir(tn, tnp, &de); 1720 if (error == 0) { 1721 i = *buflen; 1722 i -= de->td_namelen; 1723 if (i < 0) { 1724 error = ENOMEM; 1725 } else { 1726 bcopy(de->ud.td_name, buf + i, de->td_namelen); 1727 *buflen = i; 1728 } 1729 } 1730 if (error == 0) { 1731 if (vp != *dvp) 1732 VOP_UNLOCK(*dvp); 1733 } else { 1734 if (vp != *dvp) 1735 vput(*dvp); 1736 else 1737 vrele(vp); 1738 } 1739 return (error); 1740 } 1741 1742 static int 1743 tmpfs_vptocnp(struct vop_vptocnp_args *ap) 1744 { 1745 struct vnode *vp, **dvp; 1746 struct tmpfs_node *tn, *tnp, *tnp1; 1747 struct tmpfs_dirent *de; 1748 struct tmpfs_mount *tm; 1749 char *buf; 1750 size_t *buflen; 1751 int error; 1752 1753 vp = ap->a_vp; 1754 dvp = ap->a_vpp; 1755 buf = ap->a_buf; 1756 buflen = ap->a_buflen; 1757 1758 tm = VFS_TO_TMPFS(vp->v_mount); 1759 tn = VP_TO_TMPFS_NODE(vp); 1760 if (tn->tn_type == VDIR) { 1761 tnp = tn->tn_dir.tn_parent; 1762 if (tnp == NULL) 1763 return (ENOENT); 1764 tmpfs_ref_node(tnp); 1765 error = tmpfs_vptocnp_fill(vp, tn, tn->tn_dir.tn_parent, buf, 1766 buflen, dvp); 1767 tmpfs_free_node(tm, tnp); 1768 return (error); 1769 } 1770 restart: 1771 TMPFS_LOCK(tm); 1772 restart_locked: 1773 LIST_FOREACH_SAFE(tnp, &tm->tm_nodes_used, tn_entries, tnp1) { 1774 if (tnp->tn_type != VDIR) 1775 continue; 1776 TMPFS_NODE_LOCK(tnp); 1777 tmpfs_ref_node(tnp); 1778 1779 /* 1780 * tn_vnode cannot be instantiated while we hold the 1781 * node lock, so the directory cannot be changed while 1782 * we iterate over it. Do this to avoid instantiating 1783 * vnode for directories which cannot point to our 1784 * node. 1785 */ 1786 error = tnp->tn_vnode == NULL ? tmpfs_vptocnp_dir(tn, tnp, 1787 &de) : 0; 1788 1789 if (error == 0) { 1790 TMPFS_NODE_UNLOCK(tnp); 1791 TMPFS_UNLOCK(tm); 1792 error = tmpfs_vptocnp_fill(vp, tn, tnp, buf, buflen, 1793 dvp); 1794 if (error == 0) { 1795 tmpfs_free_node(tm, tnp); 1796 return (0); 1797 } 1798 if (VN_IS_DOOMED(vp)) { 1799 tmpfs_free_node(tm, tnp); 1800 return (ENOENT); 1801 } 1802 TMPFS_LOCK(tm); 1803 TMPFS_NODE_LOCK(tnp); 1804 } 1805 if (tmpfs_free_node_locked(tm, tnp, false)) { 1806 goto restart; 1807 } else { 1808 KASSERT(tnp->tn_refcount > 0, 1809 ("node %p refcount zero", tnp)); 1810 if (tnp->tn_attached) { 1811 tnp1 = LIST_NEXT(tnp, tn_entries); 1812 TMPFS_NODE_UNLOCK(tnp); 1813 } else { 1814 TMPFS_NODE_UNLOCK(tnp); 1815 goto restart_locked; 1816 } 1817 } 1818 } 1819 TMPFS_UNLOCK(tm); 1820 return (ENOENT); 1821 } 1822 1823 /* 1824 * Vnode operations vector used for files stored in a tmpfs file system. 1825 */ 1826 struct vop_vector tmpfs_vnodeop_entries = { 1827 .vop_default = &default_vnodeops, 1828 .vop_lookup = vfs_cache_lookup, 1829 .vop_cachedlookup = tmpfs_cached_lookup, 1830 .vop_create = tmpfs_create, 1831 .vop_mknod = tmpfs_mknod, 1832 .vop_open = tmpfs_open, 1833 .vop_close = tmpfs_close, 1834 .vop_fplookup_vexec = tmpfs_fplookup_vexec, 1835 .vop_fplookup_symlink = tmpfs_fplookup_symlink, 1836 .vop_access = tmpfs_access, 1837 .vop_stat = tmpfs_stat, 1838 .vop_getattr = tmpfs_getattr, 1839 .vop_setattr = tmpfs_setattr, 1840 .vop_read = tmpfs_read, 1841 .vop_read_pgcache = tmpfs_read_pgcache, 1842 .vop_write = tmpfs_write, 1843 .vop_fsync = tmpfs_fsync, 1844 .vop_remove = tmpfs_remove, 1845 .vop_link = tmpfs_link, 1846 .vop_rename = tmpfs_rename, 1847 .vop_mkdir = tmpfs_mkdir, 1848 .vop_rmdir = tmpfs_rmdir, 1849 .vop_symlink = tmpfs_symlink, 1850 .vop_readdir = tmpfs_readdir, 1851 .vop_readlink = tmpfs_readlink, 1852 .vop_inactive = tmpfs_inactive, 1853 .vop_need_inactive = tmpfs_need_inactive, 1854 .vop_reclaim = tmpfs_reclaim, 1855 .vop_print = tmpfs_print, 1856 .vop_pathconf = tmpfs_pathconf, 1857 .vop_vptofh = tmpfs_vptofh, 1858 .vop_whiteout = tmpfs_whiteout, 1859 .vop_bmap = VOP_EOPNOTSUPP, 1860 .vop_vptocnp = tmpfs_vptocnp, 1861 .vop_lock1 = vop_lock, 1862 .vop_unlock = vop_unlock, 1863 .vop_islocked = vop_islocked, 1864 }; 1865 VFS_VOP_VECTOR_REGISTER(tmpfs_vnodeop_entries); 1866 1867 /* 1868 * Same vector for mounts which do not use namecache. 1869 */ 1870 struct vop_vector tmpfs_vnodeop_nonc_entries = { 1871 .vop_default = &tmpfs_vnodeop_entries, 1872 .vop_lookup = tmpfs_lookup, 1873 }; 1874 VFS_VOP_VECTOR_REGISTER(tmpfs_vnodeop_nonc_entries); 1875