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 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 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/dirent.h> 42 #include <sys/extattr.h> 43 #include <sys/fcntl.h> 44 #include <sys/file.h> 45 #include <sys/filio.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/smr.h> 56 #include <sys/stat.h> 57 #include <sys/sysctl.h> 58 #include <sys/unistd.h> 59 #include <sys/vnode.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 #include <vm/vm_page.h> 67 #include <vm/vm_pager.h> 68 #include <vm/swap_pager.h> 69 70 #include <fs/tmpfs/tmpfs_vnops.h> 71 #include <fs/tmpfs/tmpfs.h> 72 73 SYSCTL_DECL(_vfs_tmpfs); 74 VFS_SMR_DECLARE; 75 76 static volatile int tmpfs_rename_restarts; 77 SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD, 78 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0, 79 "Times rename had to restart due to lock contention"); 80 81 MALLOC_DEFINE(M_TMPFSEA, "tmpfs extattr", "tmpfs extattr structure"); 82 83 static int 84 tmpfs_vn_get_ino_alloc(struct mount *mp, void *arg, int lkflags, 85 struct vnode **rvp) 86 { 87 88 return (tmpfs_alloc_vp(mp, arg, lkflags, rvp)); 89 } 90 91 static int 92 tmpfs_lookup1(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp) 93 { 94 struct tmpfs_dirent *de; 95 struct tmpfs_node *dnode, *pnode; 96 struct tmpfs_mount *tm; 97 int error; 98 99 /* Caller assumes responsibility for ensuring access (VEXEC). */ 100 dnode = VP_TO_TMPFS_DIR(dvp); 101 *vpp = NULL; 102 103 /* We cannot be requesting the parent directory of the root node. */ 104 MPASS(IMPLIES(dnode->tn_type == VDIR && 105 dnode->tn_dir.tn_parent == dnode, 106 !(cnp->cn_flags & ISDOTDOT))); 107 108 TMPFS_ASSERT_LOCKED(dnode); 109 if (dnode->tn_dir.tn_parent == NULL) { 110 error = ENOENT; 111 goto out; 112 } 113 if (cnp->cn_flags & ISDOTDOT) { 114 tm = VFS_TO_TMPFS(dvp->v_mount); 115 pnode = dnode->tn_dir.tn_parent; 116 tmpfs_ref_node(pnode); 117 error = vn_vget_ino_gen(dvp, tmpfs_vn_get_ino_alloc, 118 pnode, cnp->cn_lkflags, vpp); 119 tmpfs_free_node(tm, pnode); 120 if (error != 0) 121 goto out; 122 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 123 vref(dvp); 124 *vpp = dvp; 125 error = 0; 126 } else { 127 de = tmpfs_dir_lookup(dnode, NULL, cnp); 128 if (de != NULL && de->td_node == NULL) 129 cnp->cn_flags |= ISWHITEOUT; 130 if (de == NULL || de->td_node == NULL) { 131 /* 132 * The entry was not found in the directory. 133 * This is OK if we are creating or renaming an 134 * entry and are working on the last component of 135 * the path name. 136 */ 137 if ((cnp->cn_flags & ISLASTCN) && 138 (cnp->cn_nameiop == CREATE || \ 139 cnp->cn_nameiop == RENAME || 140 (cnp->cn_nameiop == DELETE && 141 cnp->cn_flags & DOWHITEOUT && 142 cnp->cn_flags & ISWHITEOUT))) { 143 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 144 curthread); 145 if (error != 0) 146 goto out; 147 148 error = EJUSTRETURN; 149 } else 150 error = ENOENT; 151 } else { 152 struct tmpfs_node *tnode; 153 154 /* 155 * The entry was found, so get its associated 156 * tmpfs_node. 157 */ 158 tnode = de->td_node; 159 160 /* 161 * If we are not at the last path component and 162 * found a non-directory or non-link entry (which 163 * may itself be pointing to a directory), raise 164 * an error. 165 */ 166 if ((tnode->tn_type != VDIR && 167 tnode->tn_type != VLNK) && 168 !(cnp->cn_flags & ISLASTCN)) { 169 error = ENOTDIR; 170 goto out; 171 } 172 173 /* 174 * If we are deleting or renaming the entry, keep 175 * track of its tmpfs_dirent so that it can be 176 * easily deleted later. 177 */ 178 if ((cnp->cn_flags & ISLASTCN) && 179 (cnp->cn_nameiop == DELETE || 180 cnp->cn_nameiop == RENAME)) { 181 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 182 curthread); 183 if (error != 0) 184 goto out; 185 186 /* Allocate a new vnode on the matching entry. */ 187 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 188 cnp->cn_lkflags, vpp); 189 if (error != 0) 190 goto out; 191 192 if ((dnode->tn_mode & S_ISTXT) && 193 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, 194 curthread) && VOP_ACCESS(*vpp, VADMIN, 195 cnp->cn_cred, curthread)) { 196 error = EPERM; 197 vput(*vpp); 198 *vpp = NULL; 199 goto out; 200 } 201 } else { 202 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 203 cnp->cn_lkflags, vpp); 204 if (error != 0) 205 goto out; 206 } 207 } 208 } 209 210 /* 211 * Store the result of this lookup in the cache. Avoid this if the 212 * request was for creation, as it does not improve timings on 213 * emprical tests. 214 */ 215 if ((cnp->cn_flags & MAKEENTRY) != 0 && tmpfs_use_nc(dvp)) 216 cache_enter(dvp, *vpp, cnp); 217 218 out: 219 #ifdef INVARIANTS 220 /* 221 * If there were no errors, *vpp cannot be null and it must be 222 * locked. 223 */ 224 if (error == 0) { 225 MPASS(*vpp != NULL); 226 ASSERT_VOP_LOCKED(*vpp, __func__); 227 } else { 228 MPASS(*vpp == NULL); 229 } 230 #endif 231 232 return (error); 233 } 234 235 static int 236 tmpfs_cached_lookup(struct vop_cachedlookup_args *v) 237 { 238 239 return (tmpfs_lookup1(v->a_dvp, v->a_vpp, v->a_cnp)); 240 } 241 242 static int 243 tmpfs_lookup(struct vop_lookup_args *v) 244 { 245 struct vnode *dvp = v->a_dvp; 246 struct vnode **vpp = v->a_vpp; 247 struct componentname *cnp = v->a_cnp; 248 int error; 249 250 /* Check accessibility of requested node as a first step. */ 251 error = vn_dir_check_exec(dvp, cnp); 252 if (error != 0) 253 return (error); 254 255 return (tmpfs_lookup1(dvp, vpp, cnp)); 256 } 257 258 static int 259 tmpfs_create(struct vop_create_args *v) 260 { 261 struct vnode *dvp = v->a_dvp; 262 struct vnode **vpp = v->a_vpp; 263 struct componentname *cnp = v->a_cnp; 264 struct vattr *vap = v->a_vap; 265 int error; 266 267 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 268 269 error = tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 270 if (error == 0 && (cnp->cn_flags & MAKEENTRY) != 0 && tmpfs_use_nc(dvp)) 271 cache_enter(dvp, *vpp, cnp); 272 return (error); 273 } 274 275 static int 276 tmpfs_mknod(struct vop_mknod_args *v) 277 { 278 struct vnode *dvp = v->a_dvp; 279 struct vnode **vpp = v->a_vpp; 280 struct componentname *cnp = v->a_cnp; 281 struct vattr *vap = v->a_vap; 282 283 if (!VATTR_ISDEV(vap) && vap->va_type != VFIFO) 284 return (EINVAL); 285 286 return (tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL)); 287 } 288 289 struct fileops tmpfs_fnops; 290 291 static int 292 tmpfs_open(struct vop_open_args *v) 293 { 294 struct vnode *vp; 295 struct tmpfs_node *node; 296 struct file *fp; 297 int error, mode; 298 299 vp = v->a_vp; 300 mode = v->a_mode; 301 node = VP_TO_TMPFS_NODE(vp); 302 303 /* 304 * The file is still active but all its names have been removed 305 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 306 * it is about to die. 307 */ 308 if (node->tn_links < 1) 309 return (ENOENT); 310 311 /* If the file is marked append-only, deny write requests. */ 312 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 313 error = EPERM; 314 else { 315 error = 0; 316 /* For regular files, the call below is nop. */ 317 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags & 318 OBJ_DEAD) == 0, ("dead object")); 319 vnode_create_vobject(vp, node->tn_size, v->a_td); 320 } 321 322 fp = v->a_fp; 323 MPASS(fp == NULL || fp->f_data == NULL); 324 if (error == 0 && fp != NULL && vp->v_type == VREG) { 325 tmpfs_ref_node(node); 326 finit_vnode(fp, mode, node, &tmpfs_fnops); 327 } 328 329 return (error); 330 } 331 332 static int 333 tmpfs_close(struct vop_close_args *v) 334 { 335 struct vnode *vp = v->a_vp; 336 337 /* Update node times. */ 338 tmpfs_update(vp); 339 340 return (0); 341 } 342 343 int 344 tmpfs_fo_close(struct file *fp, struct thread *td) 345 { 346 struct tmpfs_node *node; 347 348 node = fp->f_data; 349 if (node != NULL) { 350 MPASS(node->tn_type == VREG); 351 tmpfs_free_node(node->tn_reg.tn_tmp, node); 352 } 353 return (vnops.fo_close(fp, td)); 354 } 355 356 /* 357 * VOP_FPLOOKUP_VEXEC routines are subject to special circumstances, see 358 * the comment above cache_fplookup for details. 359 */ 360 int 361 tmpfs_fplookup_vexec(struct vop_fplookup_vexec_args *v) 362 { 363 struct vnode *vp; 364 struct tmpfs_node *node; 365 struct ucred *cred; 366 mode_t all_x, mode; 367 368 vp = v->a_vp; 369 node = VP_TO_TMPFS_NODE_SMR(vp); 370 if (__predict_false(node == NULL)) 371 return (EAGAIN); 372 373 all_x = S_IXUSR | S_IXGRP | S_IXOTH; 374 mode = atomic_load_short(&node->tn_mode); 375 if (__predict_true((mode & all_x) == all_x)) 376 return (0); 377 378 cred = v->a_cred; 379 return (vaccess_vexec_smr(mode, node->tn_uid, node->tn_gid, cred)); 380 } 381 382 static int 383 tmpfs_access_locked(struct vnode *vp, struct tmpfs_node *node, 384 accmode_t accmode, struct ucred *cred) 385 { 386 #ifdef INVARIANTS 387 if (!mtx_owned(TMPFS_NODE_MTX(node))) { 388 ASSERT_VOP_LOCKED(vp, 389 "tmpfs_access_locked needs locked vnode or node"); 390 } 391 #endif 392 393 if ((accmode & VWRITE) != 0 && (node->tn_flags & IMMUTABLE) != 0) 394 return (EPERM); 395 return (vaccess(vp->v_type, node->tn_mode, node->tn_uid, node->tn_gid, 396 accmode, cred)); 397 } 398 399 int 400 tmpfs_access(struct vop_access_args *v) 401 { 402 struct vnode *vp = v->a_vp; 403 struct ucred *cred = v->a_cred; 404 struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp); 405 mode_t all_x = S_IXUSR | S_IXGRP | S_IXOTH; 406 accmode_t accmode = v->a_accmode; 407 408 /* 409 * Common case path lookup. 410 */ 411 if (__predict_true(accmode == VEXEC && 412 (node->tn_mode & all_x) == all_x)) 413 return (0); 414 415 switch (vp->v_type) { 416 case VDIR: 417 /* FALLTHROUGH */ 418 case VLNK: 419 /* FALLTHROUGH */ 420 case VREG: 421 if ((accmode & VWRITE) != 0 && 422 (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) 423 return (EROFS); 424 break; 425 426 case VBLK: 427 /* FALLTHROUGH */ 428 case VCHR: 429 /* FALLTHROUGH */ 430 case VSOCK: 431 /* FALLTHROUGH */ 432 case VFIFO: 433 break; 434 435 default: 436 return (EINVAL); 437 } 438 439 return (tmpfs_access_locked(vp, node, accmode, cred)); 440 } 441 442 int 443 tmpfs_stat(struct vop_stat_args *v) 444 { 445 struct vnode *vp = v->a_vp; 446 struct stat *sb = v->a_sb; 447 struct tmpfs_node *node; 448 int error; 449 450 node = VP_TO_TMPFS_NODE(vp); 451 452 tmpfs_update_getattr(vp); 453 454 error = vop_stat_helper_pre(v); 455 if (__predict_false(error)) 456 return (error); 457 458 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0]; 459 sb->st_ino = node->tn_id; 460 sb->st_mode = node->tn_mode | VTTOIF(vp->v_type); 461 sb->st_nlink = node->tn_links; 462 sb->st_uid = node->tn_uid; 463 sb->st_gid = node->tn_gid; 464 sb->st_rdev = VN_ISDEV(vp) ? node->tn_rdev : NODEV; 465 sb->st_size = node->tn_size; 466 sb->st_atim.tv_sec = node->tn_atime.tv_sec; 467 sb->st_atim.tv_nsec = node->tn_atime.tv_nsec; 468 sb->st_mtim.tv_sec = node->tn_mtime.tv_sec; 469 sb->st_mtim.tv_nsec = node->tn_mtime.tv_nsec; 470 sb->st_ctim.tv_sec = node->tn_ctime.tv_sec; 471 sb->st_ctim.tv_nsec = node->tn_ctime.tv_nsec; 472 sb->st_birthtim.tv_sec = node->tn_birthtime.tv_sec; 473 sb->st_birthtim.tv_nsec = node->tn_birthtime.tv_nsec; 474 sb->st_blksize = PAGE_SIZE; 475 sb->st_flags = node->tn_flags; 476 sb->st_gen = node->tn_gen; 477 sb->st_filerev = 0; 478 if (vp->v_type == VREG) { 479 #ifdef __ILP32__ 480 vm_object_t obj = node->tn_reg.tn_aobj; 481 482 /* Handle torn read */ 483 VM_OBJECT_RLOCK(obj); 484 #endif 485 sb->st_blocks = ptoa(node->tn_reg.tn_pages); 486 #ifdef __ILP32__ 487 VM_OBJECT_RUNLOCK(obj); 488 #endif 489 } else { 490 sb->st_blocks = node->tn_size; 491 } 492 sb->st_blocks /= S_BLKSIZE; 493 return (vop_stat_helper_post(v, error)); 494 } 495 496 int 497 tmpfs_getattr(struct vop_getattr_args *v) 498 { 499 struct vnode *vp = v->a_vp; 500 struct vattr *vap = v->a_vap; 501 struct tmpfs_node *node; 502 503 node = VP_TO_TMPFS_NODE(vp); 504 505 tmpfs_update_getattr(vp); 506 507 vap->va_type = vp->v_type; 508 vap->va_mode = node->tn_mode; 509 vap->va_nlink = node->tn_links; 510 vap->va_uid = node->tn_uid; 511 vap->va_gid = node->tn_gid; 512 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 513 vap->va_fileid = node->tn_id; 514 vap->va_size = node->tn_size; 515 vap->va_blocksize = PAGE_SIZE; 516 vap->va_atime = node->tn_atime; 517 vap->va_mtime = node->tn_mtime; 518 vap->va_ctime = node->tn_ctime; 519 vap->va_birthtime = node->tn_birthtime; 520 vap->va_gen = node->tn_gen; 521 vap->va_flags = node->tn_flags; 522 vap->va_rdev = VN_ISDEV(vp) ? node->tn_rdev : NODEV; 523 if (vp->v_type == VREG) { 524 #ifdef __ILP32__ 525 vm_object_t obj = node->tn_reg.tn_aobj; 526 527 VM_OBJECT_RLOCK(obj); 528 #endif 529 vap->va_bytes = ptoa(node->tn_reg.tn_pages); 530 #ifdef __ILP32__ 531 VM_OBJECT_RUNLOCK(obj); 532 #endif 533 } else { 534 vap->va_bytes = node->tn_size; 535 } 536 vap->va_filerev = 0; 537 538 return (0); 539 } 540 541 int 542 tmpfs_setattr(struct vop_setattr_args *v) 543 { 544 struct vnode *vp = v->a_vp; 545 struct vattr *vap = v->a_vap; 546 struct ucred *cred = v->a_cred; 547 struct thread *td = curthread; 548 549 int error; 550 551 ASSERT_VOP_IN_SEQC(vp); 552 553 error = 0; 554 555 /* Abort if any unsettable attribute is given. */ 556 if (vap->va_type != VNON || 557 vap->va_nlink != VNOVAL || 558 vap->va_fsid != VNOVAL || 559 vap->va_fileid != VNOVAL || 560 vap->va_blocksize != VNOVAL || 561 vap->va_gen != VNOVAL || 562 vap->va_rdev != VNOVAL || 563 vap->va_bytes != VNOVAL) 564 error = EINVAL; 565 566 if (error == 0 && (vap->va_flags != VNOVAL)) 567 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 568 569 if (error == 0 && (vap->va_size != VNOVAL)) 570 error = tmpfs_chsize(vp, vap->va_size, cred, td); 571 572 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 573 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 574 575 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 576 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 577 578 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 579 vap->va_atime.tv_nsec != VNOVAL) || 580 (vap->va_mtime.tv_sec != VNOVAL && 581 vap->va_mtime.tv_nsec != VNOVAL) || 582 (vap->va_birthtime.tv_sec != VNOVAL && 583 vap->va_birthtime.tv_nsec != VNOVAL))) 584 error = tmpfs_chtimes(vp, vap, cred, td); 585 586 /* 587 * Update the node times. We give preference to the error codes 588 * generated by this function rather than the ones that may arise 589 * from tmpfs_update. 590 */ 591 tmpfs_update(vp); 592 593 return (error); 594 } 595 596 static int 597 tmpfs_read(struct vop_read_args *v) 598 { 599 struct vnode *vp; 600 struct uio *uio; 601 struct tmpfs_node *node; 602 603 vp = v->a_vp; 604 if (vp->v_type != VREG) 605 return (EISDIR); 606 uio = v->a_uio; 607 if (uio->uio_offset < 0) 608 return (EINVAL); 609 node = VP_TO_TMPFS_NODE(vp); 610 tmpfs_set_accessed(VFS_TO_TMPFS(vp->v_mount), node); 611 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio)); 612 } 613 614 static int 615 tmpfs_read_pgcache(struct vop_read_pgcache_args *v) 616 { 617 struct vnode *vp; 618 struct tmpfs_node *node; 619 vm_object_t object; 620 off_t size; 621 int error; 622 623 vp = v->a_vp; 624 VNPASS((vn_irflag_read(vp) & VIRF_PGREAD) != 0, vp); 625 626 if (v->a_uio->uio_offset < 0) 627 return (EINVAL); 628 629 error = EJUSTRETURN; 630 vfs_smr_enter(); 631 632 node = VP_TO_TMPFS_NODE_SMR(vp); 633 if (node == NULL) 634 goto out_smr; 635 MPASS(node->tn_type == VREG); 636 MPASS(node->tn_refcount >= 1); 637 object = node->tn_reg.tn_aobj; 638 if (object == NULL) 639 goto out_smr; 640 641 MPASS(object->type == tmpfs_pager_type); 642 MPASS((object->flags & (OBJ_ANON | OBJ_DEAD | OBJ_SWAP)) == 643 OBJ_SWAP); 644 if (!VN_IS_DOOMED(vp)) { 645 /* size cannot become shorter due to rangelock. */ 646 size = node->tn_size; 647 tmpfs_set_accessed(node->tn_reg.tn_tmp, node); 648 vfs_smr_exit(); 649 error = uiomove_object(object, size, v->a_uio); 650 return (error); 651 } 652 out_smr: 653 vfs_smr_exit(); 654 return (error); 655 } 656 657 static int 658 tmpfs_write(struct vop_write_args *v) 659 { 660 struct vnode *vp; 661 struct uio *uio; 662 struct tmpfs_node *node; 663 off_t oldsize; 664 ssize_t r; 665 int error, ioflag; 666 mode_t newmode; 667 668 vp = v->a_vp; 669 uio = v->a_uio; 670 ioflag = v->a_ioflag; 671 error = 0; 672 node = VP_TO_TMPFS_NODE(vp); 673 oldsize = node->tn_size; 674 675 if (uio->uio_offset < 0 || vp->v_type != VREG) 676 return (EINVAL); 677 if (uio->uio_resid == 0) 678 return (0); 679 if (ioflag & IO_APPEND) 680 uio->uio_offset = node->tn_size; 681 error = vn_rlimit_fsizex(vp, uio, VFS_TO_TMPFS(vp->v_mount)-> 682 tm_maxfilesize, &r, uio->uio_td); 683 if (error != 0) { 684 vn_rlimit_fsizex_res(uio, r); 685 return (error); 686 } 687 688 if (uio->uio_offset + uio->uio_resid > node->tn_size) { 689 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 690 FALSE); 691 if (error != 0) 692 goto out; 693 } 694 695 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio); 696 node->tn_status |= TMPFS_NODE_MODIFIED | TMPFS_NODE_CHANGED; 697 node->tn_accessed = true; 698 if (node->tn_mode & (S_ISUID | S_ISGID)) { 699 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID)) { 700 newmode = node->tn_mode & ~(S_ISUID | S_ISGID); 701 vn_seqc_write_begin(vp); 702 atomic_store_short(&node->tn_mode, newmode); 703 vn_seqc_write_end(vp); 704 } 705 } 706 if (error != 0) 707 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 708 709 out: 710 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 711 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 712 713 vn_rlimit_fsizex_res(uio, r); 714 return (error); 715 } 716 717 static int 718 tmpfs_deallocate(struct vop_deallocate_args *v) 719 { 720 return (tmpfs_reg_punch_hole(v->a_vp, v->a_offset, v->a_len)); 721 } 722 723 static int 724 tmpfs_fsync(struct vop_fsync_args *v) 725 { 726 struct vnode *vp = v->a_vp; 727 728 tmpfs_check_mtime(vp); 729 tmpfs_update(vp); 730 731 return (0); 732 } 733 734 static int 735 tmpfs_remove(struct vop_remove_args *v) 736 { 737 struct vnode *dvp = v->a_dvp; 738 struct vnode *vp = v->a_vp; 739 740 int error; 741 struct tmpfs_dirent *de; 742 struct tmpfs_mount *tmp; 743 struct tmpfs_node *dnode; 744 struct tmpfs_node *node; 745 746 if (vp->v_type == VDIR) { 747 error = EISDIR; 748 goto out; 749 } 750 751 dnode = VP_TO_TMPFS_DIR(dvp); 752 node = VP_TO_TMPFS_NODE(vp); 753 tmp = VFS_TO_TMPFS(vp->v_mount); 754 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 755 MPASS(de != NULL); 756 757 /* Files marked as immutable or append-only cannot be deleted. */ 758 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 759 (dnode->tn_flags & APPEND)) { 760 error = EPERM; 761 goto out; 762 } 763 764 /* Remove the entry from the directory; as it is a file, we do not 765 * have to change the number of hard links of the directory. */ 766 tmpfs_dir_detach(dvp, de); 767 if (v->a_cnp->cn_flags & DOWHITEOUT) 768 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 769 770 /* Free the directory entry we just deleted. Note that the node 771 * referred by it will not be removed until the vnode is really 772 * reclaimed. */ 773 tmpfs_free_dirent(tmp, de); 774 775 node->tn_status |= TMPFS_NODE_CHANGED; 776 node->tn_accessed = true; 777 error = 0; 778 779 out: 780 return (error); 781 } 782 783 static int 784 tmpfs_link(struct vop_link_args *v) 785 { 786 struct vnode *dvp = v->a_tdvp; 787 struct vnode *vp = v->a_vp; 788 struct componentname *cnp = v->a_cnp; 789 790 int error; 791 struct tmpfs_dirent *de; 792 struct tmpfs_node *node; 793 794 MPASS(dvp != vp); /* XXX When can this be false? */ 795 node = VP_TO_TMPFS_NODE(vp); 796 797 /* Ensure that we do not overflow the maximum number of links imposed 798 * by the system. */ 799 MPASS(node->tn_links <= TMPFS_LINK_MAX); 800 if (node->tn_links == TMPFS_LINK_MAX) { 801 error = EMLINK; 802 goto out; 803 } 804 805 /* We cannot create links of files marked immutable or append-only. */ 806 if (node->tn_flags & (IMMUTABLE | APPEND)) { 807 error = EPERM; 808 goto out; 809 } 810 811 /* Allocate a new directory entry to represent the node. */ 812 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 813 cnp->cn_nameptr, cnp->cn_namelen, &de); 814 if (error != 0) 815 goto out; 816 817 /* Insert the new directory entry into the appropriate directory. */ 818 if (cnp->cn_flags & ISWHITEOUT) 819 tmpfs_dir_whiteout_remove(dvp, cnp); 820 tmpfs_dir_attach(dvp, de); 821 822 /* vp link count has changed, so update node times. */ 823 node->tn_status |= TMPFS_NODE_CHANGED; 824 tmpfs_update(vp); 825 826 error = 0; 827 828 out: 829 return (error); 830 } 831 832 /* 833 * We acquire all but fdvp locks using non-blocking acquisitions. If we 834 * fail to acquire any lock in the path we will drop all held locks, 835 * acquire the new lock in a blocking fashion, and then release it and 836 * restart the rename. This acquire/release step ensures that we do not 837 * spin on a lock waiting for release. On error release all vnode locks 838 * and decrement references the way tmpfs_rename() would do. 839 */ 840 static int 841 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 842 struct vnode *tdvp, struct vnode **tvpp, 843 struct componentname *fcnp, struct componentname *tcnp) 844 { 845 struct vnode *nvp; 846 struct mount *mp; 847 struct tmpfs_dirent *de; 848 int error, restarts = 0; 849 850 VOP_UNLOCK(tdvp); 851 if (*tvpp != NULL && *tvpp != tdvp) 852 VOP_UNLOCK(*tvpp); 853 mp = fdvp->v_mount; 854 855 relock: 856 restarts += 1; 857 error = vn_lock(fdvp, LK_EXCLUSIVE); 858 if (error) 859 goto releout; 860 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 861 VOP_UNLOCK(fdvp); 862 error = vn_lock(tdvp, LK_EXCLUSIVE); 863 if (error) 864 goto releout; 865 VOP_UNLOCK(tdvp); 866 goto relock; 867 } 868 /* 869 * Re-resolve fvp to be certain it still exists and fetch the 870 * correct vnode. 871 */ 872 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 873 if (de == NULL) { 874 VOP_UNLOCK(fdvp); 875 VOP_UNLOCK(tdvp); 876 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 877 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 878 error = EINVAL; 879 else 880 error = ENOENT; 881 goto releout; 882 } 883 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 884 if (error != 0) { 885 VOP_UNLOCK(fdvp); 886 VOP_UNLOCK(tdvp); 887 if (error != EBUSY) 888 goto releout; 889 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 890 if (error != 0) 891 goto releout; 892 VOP_UNLOCK(nvp); 893 /* 894 * Concurrent rename race. 895 */ 896 if (nvp == tdvp) { 897 vrele(nvp); 898 error = EINVAL; 899 goto releout; 900 } 901 vrele(*fvpp); 902 *fvpp = nvp; 903 goto relock; 904 } 905 vrele(*fvpp); 906 *fvpp = nvp; 907 VOP_UNLOCK(*fvpp); 908 /* 909 * Re-resolve tvp and acquire the vnode lock if present. 910 */ 911 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 912 /* 913 * If tvp disappeared we just carry on. 914 */ 915 if (de == NULL && *tvpp != NULL) { 916 vrele(*tvpp); 917 *tvpp = NULL; 918 } 919 /* 920 * Get the tvp ino if the lookup succeeded. We may have to restart 921 * if the non-blocking acquire fails. 922 */ 923 if (de != NULL) { 924 nvp = NULL; 925 error = tmpfs_alloc_vp(mp, de->td_node, 926 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 927 if (*tvpp != NULL) 928 vrele(*tvpp); 929 *tvpp = nvp; 930 if (error != 0) { 931 VOP_UNLOCK(fdvp); 932 VOP_UNLOCK(tdvp); 933 if (error != EBUSY) 934 goto releout; 935 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 936 &nvp); 937 if (error != 0) 938 goto releout; 939 VOP_UNLOCK(nvp); 940 /* 941 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 942 */ 943 if (nvp == fdvp) { 944 error = ENOTEMPTY; 945 goto releout; 946 } 947 goto relock; 948 } 949 } 950 tmpfs_rename_restarts += restarts; 951 952 return (0); 953 954 releout: 955 vrele(fdvp); 956 vrele(*fvpp); 957 vrele(tdvp); 958 if (*tvpp != NULL) 959 vrele(*tvpp); 960 tmpfs_rename_restarts += restarts; 961 962 return (error); 963 } 964 965 static int 966 tmpfs_rename(struct vop_rename_args *v) 967 { 968 struct vnode *fdvp = v->a_fdvp; 969 struct vnode *fvp = v->a_fvp; 970 struct componentname *fcnp = v->a_fcnp; 971 struct vnode *tdvp = v->a_tdvp; 972 struct vnode *tvp = v->a_tvp; 973 struct componentname *tcnp = v->a_tcnp; 974 char *newname; 975 struct tmpfs_dirent *de; 976 struct tmpfs_mount *tmp; 977 struct tmpfs_node *fdnode; 978 struct tmpfs_node *fnode; 979 struct tmpfs_node *tnode; 980 struct tmpfs_node *tdnode; 981 int error; 982 bool want_seqc_end; 983 984 want_seqc_end = false; 985 986 /* 987 * Disallow cross-device renames. 988 * XXX Why isn't this done by the caller? 989 */ 990 if (fvp->v_mount != tdvp->v_mount || 991 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 992 error = EXDEV; 993 goto out; 994 } 995 996 if ((v->a_flags & ~(AT_RENAME_NOREPLACE)) != 0) { 997 error = EOPNOTSUPP; 998 goto out; 999 } 1000 1001 /* If source and target are the same file, there is nothing to do. */ 1002 if (fvp == tvp) { 1003 error = 0; 1004 goto out; 1005 } 1006 1007 /* 1008 * If we need to move the directory between entries, lock the 1009 * source so that we can safely operate on it. 1010 */ 1011 if (fdvp != tdvp && fdvp != tvp) { 1012 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 1013 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 1014 fcnp, tcnp); 1015 if (error != 0) 1016 return (error); 1017 ASSERT_VOP_ELOCKED(fdvp, 1018 "tmpfs_rename: fdvp not locked"); 1019 ASSERT_VOP_ELOCKED(tdvp, 1020 "tmpfs_rename: tdvp not locked"); 1021 if (tvp != NULL) { 1022 ASSERT_VOP_ELOCKED(tvp, 1023 "tmpfs_rename: tvp not locked"); 1024 if ((v->a_flags & AT_RENAME_NOREPLACE) != 0) { 1025 error = EEXIST; 1026 goto out_locked; 1027 } 1028 } 1029 if (fvp == tvp) { 1030 error = 0; 1031 goto out_locked; 1032 } 1033 } 1034 } 1035 1036 /* 1037 * Avoid manipulating '.' and '..' entries. 1038 */ 1039 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 1040 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) { 1041 error = EINVAL; 1042 goto out_locked; 1043 } 1044 1045 if (tvp != NULL) 1046 vn_seqc_write_begin(tvp); 1047 vn_seqc_write_begin(tdvp); 1048 vn_seqc_write_begin(fvp); 1049 vn_seqc_write_begin(fdvp); 1050 want_seqc_end = true; 1051 1052 tmp = VFS_TO_TMPFS(tdvp->v_mount); 1053 tdnode = VP_TO_TMPFS_DIR(tdvp); 1054 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 1055 fdnode = VP_TO_TMPFS_DIR(fdvp); 1056 fnode = VP_TO_TMPFS_NODE(fvp); 1057 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 1058 1059 /* 1060 * Entry can disappear before we lock fdvp. 1061 */ 1062 if (de == NULL) { 1063 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 1064 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 1065 error = EINVAL; 1066 else 1067 error = ENOENT; 1068 goto out_locked; 1069 } 1070 MPASS(de->td_node == fnode); 1071 1072 /* 1073 * If re-naming a directory to another preexisting directory 1074 * ensure that the target directory is empty so that its 1075 * removal causes no side effects. 1076 * Kern_rename guarantees the destination to be a directory 1077 * if the source is one. 1078 */ 1079 if (tvp != NULL) { 1080 MPASS(tnode != NULL); 1081 1082 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 1083 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 1084 error = EPERM; 1085 goto out_locked; 1086 } 1087 1088 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 1089 if (tnode->tn_size != 0 && 1090 ((tcnp->cn_flags & IGNOREWHITEOUT) == 0 || 1091 tnode->tn_size > tnode->tn_dir.tn_wht_size)) { 1092 error = ENOTEMPTY; 1093 goto out_locked; 1094 } 1095 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 1096 error = ENOTDIR; 1097 goto out_locked; 1098 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 1099 error = EISDIR; 1100 goto out_locked; 1101 } else { 1102 MPASS(fnode->tn_type != VDIR && 1103 tnode->tn_type != VDIR); 1104 } 1105 } 1106 1107 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 1108 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 1109 error = EPERM; 1110 goto out_locked; 1111 } 1112 1113 /* 1114 * Ensure that we have enough memory to hold the new name, if it 1115 * has to be changed. 1116 */ 1117 if (fcnp->cn_namelen != tcnp->cn_namelen || 1118 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 1119 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 1120 } else 1121 newname = NULL; 1122 1123 /* 1124 * If the node is being moved to another directory, we have to do 1125 * the move. 1126 */ 1127 if (fdnode != tdnode) { 1128 /* 1129 * In case we are moving a directory, we have to adjust its 1130 * parent to point to the new parent. 1131 */ 1132 if (de->td_node->tn_type == VDIR) { 1133 struct tmpfs_node *n; 1134 1135 TMPFS_NODE_LOCK(fnode); 1136 error = tmpfs_access_locked(fvp, fnode, VWRITE, 1137 tcnp->cn_cred); 1138 TMPFS_NODE_UNLOCK(fnode); 1139 if (error) { 1140 if (newname != NULL) 1141 free(newname, M_TMPFSNAME); 1142 goto out_locked; 1143 } 1144 1145 /* 1146 * Ensure the target directory is not a child of the 1147 * directory being moved. Otherwise, we'd end up 1148 * with stale nodes. 1149 */ 1150 n = tdnode; 1151 /* 1152 * TMPFS_LOCK guaranties that no nodes are freed while 1153 * traversing the list. Nodes can only be marked as 1154 * removed: tn_parent == NULL. 1155 */ 1156 TMPFS_LOCK(tmp); 1157 TMPFS_NODE_LOCK(n); 1158 while (n != n->tn_dir.tn_parent) { 1159 struct tmpfs_node *parent; 1160 1161 if (n == fnode) { 1162 TMPFS_NODE_UNLOCK(n); 1163 TMPFS_UNLOCK(tmp); 1164 error = EINVAL; 1165 if (newname != NULL) 1166 free(newname, M_TMPFSNAME); 1167 goto out_locked; 1168 } 1169 parent = n->tn_dir.tn_parent; 1170 TMPFS_NODE_UNLOCK(n); 1171 if (parent == NULL) { 1172 n = NULL; 1173 break; 1174 } 1175 TMPFS_NODE_LOCK(parent); 1176 if (parent->tn_dir.tn_parent == NULL) { 1177 TMPFS_NODE_UNLOCK(parent); 1178 n = NULL; 1179 break; 1180 } 1181 n = parent; 1182 } 1183 TMPFS_UNLOCK(tmp); 1184 if (n == NULL) { 1185 error = EINVAL; 1186 if (newname != NULL) 1187 free(newname, M_TMPFSNAME); 1188 goto out_locked; 1189 } 1190 TMPFS_NODE_UNLOCK(n); 1191 1192 /* Adjust the parent pointer. */ 1193 TMPFS_VALIDATE_DIR(fnode); 1194 TMPFS_NODE_LOCK(de->td_node); 1195 de->td_node->tn_dir.tn_parent = tdnode; 1196 TMPFS_NODE_UNLOCK(de->td_node); 1197 1198 /* 1199 * As a result of changing the target of the '..' 1200 * entry, the link count of the source and target 1201 * directories has to be adjusted. 1202 */ 1203 TMPFS_NODE_LOCK(tdnode); 1204 TMPFS_ASSERT_LOCKED(tdnode); 1205 tdnode->tn_links++; 1206 TMPFS_NODE_UNLOCK(tdnode); 1207 1208 TMPFS_NODE_LOCK(fdnode); 1209 TMPFS_ASSERT_LOCKED(fdnode); 1210 fdnode->tn_links--; 1211 TMPFS_NODE_UNLOCK(fdnode); 1212 } 1213 } 1214 1215 /* 1216 * Do the move: just remove the entry from the source directory 1217 * and insert it into the target one. 1218 */ 1219 tmpfs_dir_detach(fdvp, de); 1220 1221 if (fcnp->cn_flags & DOWHITEOUT) 1222 tmpfs_dir_whiteout_add(fdvp, fcnp); 1223 if (tcnp->cn_flags & ISWHITEOUT) 1224 tmpfs_dir_whiteout_remove(tdvp, tcnp); 1225 1226 /* 1227 * If the name has changed, we need to make it effective by changing 1228 * it in the directory entry. 1229 */ 1230 if (newname != NULL) { 1231 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 1232 1233 free(de->ud.td_name, M_TMPFSNAME); 1234 de->ud.td_name = newname; 1235 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 1236 1237 fnode->tn_status |= TMPFS_NODE_CHANGED; 1238 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 1239 } 1240 1241 /* 1242 * If we are overwriting an entry, we have to remove the old one 1243 * from the target directory. 1244 */ 1245 if (tvp != NULL) { 1246 struct tmpfs_dirent *tde; 1247 1248 /* Remove the old entry from the target directory. */ 1249 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 1250 tmpfs_dir_detach(tdvp, tde); 1251 1252 /* 1253 * If we are overwriting a directory, per the ENOTEMPTY check 1254 * above it must either be empty or contain only whiteout 1255 * entries. In the latter case (which can only happen if 1256 * IGNOREWHITEOUT was passed in tcnp->cn_flags), clear the 1257 * whiteout entries to avoid leaking memory. 1258 */ 1259 if (tnode->tn_type == VDIR && tnode->tn_size > 0) 1260 tmpfs_dir_clear_whiteouts(tvp); 1261 1262 /* Update node's ctime because of possible hardlinks. */ 1263 tnode->tn_status |= TMPFS_NODE_CHANGED; 1264 tmpfs_update(tvp); 1265 1266 /* 1267 * Free the directory entry we just deleted. Note that the 1268 * node referred by it will not be removed until the vnode is 1269 * really reclaimed. 1270 */ 1271 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 1272 } 1273 1274 tmpfs_dir_attach(tdvp, de); 1275 1276 if (tmpfs_use_nc(fvp)) { 1277 cache_vop_rename(fdvp, fvp, tdvp, tvp, fcnp, tcnp); 1278 } 1279 1280 error = 0; 1281 1282 out_locked: 1283 if (fdvp != tdvp && fdvp != tvp) 1284 VOP_UNLOCK(fdvp); 1285 1286 out: 1287 if (want_seqc_end) { 1288 if (tvp != NULL) 1289 vn_seqc_write_end(tvp); 1290 vn_seqc_write_end(tdvp); 1291 vn_seqc_write_end(fvp); 1292 vn_seqc_write_end(fdvp); 1293 } 1294 1295 /* 1296 * Release target nodes. 1297 * XXX: I don't understand when tdvp can be the same as tvp, but 1298 * other code takes care of this... 1299 */ 1300 if (tdvp == tvp) 1301 vrele(tdvp); 1302 else 1303 vput(tdvp); 1304 if (tvp != NULL) 1305 vput(tvp); 1306 1307 /* Release source nodes. */ 1308 vrele(fdvp); 1309 vrele(fvp); 1310 1311 return (error); 1312 } 1313 1314 static int 1315 tmpfs_mkdir(struct vop_mkdir_args *v) 1316 { 1317 struct vnode *dvp = v->a_dvp; 1318 struct vnode **vpp = v->a_vpp; 1319 struct componentname *cnp = v->a_cnp; 1320 struct vattr *vap = v->a_vap; 1321 1322 MPASS(vap->va_type == VDIR); 1323 1324 return (tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL)); 1325 } 1326 1327 static int 1328 tmpfs_rmdir(struct vop_rmdir_args *v) 1329 { 1330 struct vnode *dvp = v->a_dvp; 1331 struct vnode *vp = v->a_vp; 1332 struct componentname *cnp = v->a_cnp; 1333 1334 int error; 1335 struct tmpfs_dirent *de; 1336 struct tmpfs_mount *tmp; 1337 struct tmpfs_node *dnode; 1338 struct tmpfs_node *node; 1339 1340 tmp = VFS_TO_TMPFS(dvp->v_mount); 1341 dnode = VP_TO_TMPFS_DIR(dvp); 1342 node = VP_TO_TMPFS_DIR(vp); 1343 1344 /* 1345 * Directories with more than two non-whiteout entries ('.' and '..') 1346 * cannot be removed. 1347 */ 1348 if (node->tn_size != 0 && 1349 ((cnp->cn_flags & IGNOREWHITEOUT) == 0 || 1350 node->tn_size > node->tn_dir.tn_wht_size)) { 1351 error = ENOTEMPTY; 1352 goto out; 1353 } 1354 1355 /* Check flags to see if we are allowed to remove the directory. */ 1356 if ((dnode->tn_flags & APPEND) 1357 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1358 error = EPERM; 1359 goto out; 1360 } 1361 1362 /* This invariant holds only if we are not trying to remove "..". 1363 * We checked for that above so this is safe now. */ 1364 MPASS(node->tn_dir.tn_parent == dnode); 1365 1366 /* Get the directory entry associated with node (vp). This was 1367 * filled by tmpfs_lookup while looking up the entry. */ 1368 de = tmpfs_dir_lookup(dnode, node, cnp); 1369 MPASS(TMPFS_DIRENT_MATCHES(de, 1370 cnp->cn_nameptr, 1371 cnp->cn_namelen)); 1372 1373 /* Detach the directory entry from the directory (dnode). */ 1374 tmpfs_dir_detach(dvp, de); 1375 1376 /* 1377 * If we are removing a directory, per the ENOTEMPTY check above it 1378 * must either be empty or contain only whiteout entries. In the 1379 * latter case (which can only happen if IGNOREWHITEOUT was passed 1380 * in cnp->cn_flags), clear the whiteout entries to avoid leaking 1381 * memory. 1382 */ 1383 if (node->tn_size > 0) 1384 tmpfs_dir_clear_whiteouts(vp); 1385 1386 if (cnp->cn_flags & DOWHITEOUT) 1387 tmpfs_dir_whiteout_add(dvp, cnp); 1388 1389 /* No vnode should be allocated for this entry from this point */ 1390 TMPFS_NODE_LOCK(node); 1391 node->tn_links--; 1392 node->tn_dir.tn_parent = NULL; 1393 node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1394 node->tn_accessed = true; 1395 1396 TMPFS_NODE_UNLOCK(node); 1397 1398 TMPFS_NODE_LOCK(dnode); 1399 dnode->tn_links--; 1400 dnode->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1401 dnode->tn_accessed = true; 1402 TMPFS_NODE_UNLOCK(dnode); 1403 1404 if (tmpfs_use_nc(dvp)) { 1405 cache_vop_rmdir(dvp, vp); 1406 } 1407 1408 /* Free the directory entry we just deleted. Note that the node 1409 * referred by it will not be removed until the vnode is really 1410 * reclaimed. */ 1411 tmpfs_free_dirent(tmp, de); 1412 1413 /* Release the deleted vnode (will destroy the node, notify 1414 * interested parties and clean it from the cache). */ 1415 1416 dnode->tn_status |= TMPFS_NODE_CHANGED; 1417 tmpfs_update(dvp); 1418 1419 error = 0; 1420 1421 out: 1422 return (error); 1423 } 1424 1425 static int 1426 tmpfs_symlink(struct vop_symlink_args *v) 1427 { 1428 struct vnode *dvp = v->a_dvp; 1429 struct vnode **vpp = v->a_vpp; 1430 struct componentname *cnp = v->a_cnp; 1431 struct vattr *vap = v->a_vap; 1432 const char *target = v->a_target; 1433 1434 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1435 MPASS(vap->va_type == VLNK); 1436 #else 1437 vap->va_type = VLNK; 1438 #endif 1439 1440 return (tmpfs_alloc_file(dvp, vpp, vap, cnp, target)); 1441 } 1442 1443 static int 1444 tmpfs_readdir(struct vop_readdir_args *va) 1445 { 1446 struct vnode *vp; 1447 struct uio *uio; 1448 struct tmpfs_mount *tm; 1449 struct tmpfs_node *node; 1450 uint64_t **cookies; 1451 int *eofflag, *ncookies; 1452 ssize_t startresid; 1453 int error, maxcookies; 1454 1455 vp = va->a_vp; 1456 uio = va->a_uio; 1457 eofflag = va->a_eofflag; 1458 cookies = va->a_cookies; 1459 ncookies = va->a_ncookies; 1460 1461 /* This operation only makes sense on directory nodes. */ 1462 if (vp->v_type != VDIR) 1463 return (ENOTDIR); 1464 1465 maxcookies = 0; 1466 node = VP_TO_TMPFS_DIR(vp); 1467 tm = VFS_TO_TMPFS(vp->v_mount); 1468 1469 startresid = uio->uio_resid; 1470 1471 /* Allocate cookies for NFS and compat modules. */ 1472 if (cookies != NULL && ncookies != NULL) { 1473 maxcookies = howmany(node->tn_size, 1474 sizeof(struct tmpfs_dirent)) + 2; 1475 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1476 M_WAITOK); 1477 *ncookies = 0; 1478 } 1479 1480 if (cookies == NULL) 1481 error = tmpfs_dir_getdents(tm, node, uio, 0, NULL, NULL); 1482 else 1483 error = tmpfs_dir_getdents(tm, node, uio, maxcookies, *cookies, 1484 ncookies); 1485 1486 /* Buffer was filled without hitting EOF. */ 1487 if (error == EJUSTRETURN) 1488 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1489 1490 if (error != 0 && cookies != NULL && ncookies != NULL) { 1491 free(*cookies, M_TEMP); 1492 *cookies = NULL; 1493 *ncookies = 0; 1494 } 1495 1496 if (eofflag != NULL) 1497 *eofflag = 1498 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1499 1500 return (error); 1501 } 1502 1503 static int 1504 tmpfs_readlink(struct vop_readlink_args *v) 1505 { 1506 struct vnode *vp = v->a_vp; 1507 struct uio *uio = v->a_uio; 1508 1509 int error; 1510 struct tmpfs_node *node; 1511 1512 MPASS(uio->uio_offset == 0); 1513 MPASS(vp->v_type == VLNK); 1514 1515 node = VP_TO_TMPFS_NODE(vp); 1516 1517 error = uiomove(node->tn_link_target, MIN(node->tn_size, uio->uio_resid), 1518 uio); 1519 tmpfs_set_accessed(VFS_TO_TMPFS(vp->v_mount), node); 1520 1521 return (error); 1522 } 1523 1524 /* 1525 * VOP_FPLOOKUP_SYMLINK routines are subject to special circumstances, see 1526 * the comment above cache_fplookup for details. 1527 * 1528 * Check tmpfs_alloc_node for tmpfs-specific synchronisation notes. 1529 */ 1530 static int 1531 tmpfs_fplookup_symlink(struct vop_fplookup_symlink_args *v) 1532 { 1533 struct vnode *vp; 1534 struct tmpfs_node *node; 1535 char *symlink; 1536 1537 vp = v->a_vp; 1538 node = VP_TO_TMPFS_NODE_SMR(vp); 1539 if (__predict_false(node == NULL)) 1540 return (EAGAIN); 1541 if (!atomic_load_char(&node->tn_link_smr)) 1542 return (EAGAIN); 1543 symlink = atomic_load_ptr(&node->tn_link_target); 1544 if (symlink == NULL) 1545 return (EAGAIN); 1546 1547 return (cache_symlink_resolve(v->a_fpl, symlink, node->tn_size)); 1548 } 1549 1550 static int 1551 tmpfs_inactive(struct vop_inactive_args *v) 1552 { 1553 struct vnode *vp; 1554 struct tmpfs_node *node; 1555 1556 vp = v->a_vp; 1557 node = VP_TO_TMPFS_NODE(vp); 1558 if (node->tn_links == 0) 1559 vrecycle(vp); 1560 else 1561 tmpfs_check_mtime(vp); 1562 return (0); 1563 } 1564 1565 static int 1566 tmpfs_need_inactive(struct vop_need_inactive_args *ap) 1567 { 1568 struct vnode *vp; 1569 struct tmpfs_node *node; 1570 struct vm_object *obj; 1571 1572 vp = ap->a_vp; 1573 node = VP_TO_TMPFS_NODE(vp); 1574 if (node->tn_links == 0) 1575 goto need; 1576 if (vp->v_type == VREG) { 1577 obj = vp->v_object; 1578 if (obj->generation != obj->cleangeneration) 1579 goto need; 1580 } 1581 return (0); 1582 need: 1583 return (1); 1584 } 1585 1586 int 1587 tmpfs_reclaim(struct vop_reclaim_args *v) 1588 { 1589 struct vnode *vp; 1590 struct tmpfs_mount *tmp; 1591 struct tmpfs_node *node; 1592 bool unlock; 1593 1594 vp = v->a_vp; 1595 node = VP_TO_TMPFS_NODE(vp); 1596 tmp = VFS_TO_TMPFS(vp->v_mount); 1597 1598 if (vp->v_type == VREG) 1599 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1600 vp->v_object = NULL; 1601 1602 TMPFS_LOCK(tmp); 1603 TMPFS_NODE_LOCK(node); 1604 tmpfs_free_vp(vp); 1605 1606 /* 1607 * If the node referenced by this vnode was deleted by the user, 1608 * we must free its associated data structures (now that the vnode 1609 * is being reclaimed). 1610 */ 1611 unlock = true; 1612 if (node->tn_links == 0 && 1613 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1614 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1615 unlock = !tmpfs_free_node_locked(tmp, node, true); 1616 } 1617 1618 if (unlock) { 1619 TMPFS_NODE_UNLOCK(node); 1620 TMPFS_UNLOCK(tmp); 1621 } 1622 1623 MPASS(vp->v_data == NULL); 1624 return (0); 1625 } 1626 1627 int 1628 tmpfs_print(struct vop_print_args *v) 1629 { 1630 struct vnode *vp = v->a_vp; 1631 1632 struct tmpfs_node *node; 1633 1634 node = VP_TO_TMPFS_NODE(vp); 1635 1636 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %jd\n", 1637 node, node->tn_flags, (uintmax_t)node->tn_links); 1638 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1639 node->tn_mode, node->tn_uid, node->tn_gid, 1640 (intmax_t)node->tn_size, node->tn_status); 1641 1642 if (vp->v_type == VFIFO) 1643 fifo_printinfo(vp); 1644 1645 printf("\n"); 1646 1647 return (0); 1648 } 1649 1650 int 1651 tmpfs_pathconf(struct vop_pathconf_args *v) 1652 { 1653 struct vnode *vp = v->a_vp; 1654 int name = v->a_name; 1655 long *retval = v->a_retval; 1656 1657 int error; 1658 1659 error = 0; 1660 1661 switch (name) { 1662 case _PC_LINK_MAX: 1663 *retval = TMPFS_LINK_MAX; 1664 break; 1665 1666 case _PC_SYMLINK_MAX: 1667 *retval = MAXPATHLEN; 1668 break; 1669 1670 case _PC_NAME_MAX: 1671 *retval = NAME_MAX; 1672 break; 1673 1674 case _PC_PIPE_BUF: 1675 if (vp->v_type == VDIR || vp->v_type == VFIFO) 1676 *retval = PIPE_BUF; 1677 else 1678 error = EINVAL; 1679 break; 1680 1681 case _PC_CHOWN_RESTRICTED: 1682 *retval = 1; 1683 break; 1684 1685 case _PC_NO_TRUNC: 1686 *retval = 1; 1687 break; 1688 1689 case _PC_SYNC_IO: 1690 *retval = 1; 1691 break; 1692 1693 case _PC_FILESIZEBITS: 1694 *retval = 64; 1695 break; 1696 1697 case _PC_MIN_HOLE_SIZE: 1698 *retval = PAGE_SIZE; 1699 break; 1700 1701 case _PC_HAS_HIDDENSYSTEM: 1702 *retval = 1; 1703 break; 1704 1705 default: 1706 error = vop_stdpathconf(v); 1707 } 1708 1709 return (error); 1710 } 1711 1712 static int 1713 tmpfs_vptofh(struct vop_vptofh_args *ap) 1714 /* 1715 vop_vptofh { 1716 IN struct vnode *a_vp; 1717 IN struct fid *a_fhp; 1718 }; 1719 */ 1720 { 1721 struct tmpfs_fid_data *const tfd = (struct tmpfs_fid_data *)ap->a_fhp; 1722 struct tmpfs_node *node; 1723 _Static_assert(sizeof(struct tmpfs_fid_data) <= sizeof(struct fid), 1724 "struct tmpfs_fid_data cannot be larger than struct fid"); 1725 1726 node = VP_TO_TMPFS_NODE(ap->a_vp); 1727 tfd->tfd_len = sizeof(*tfd); 1728 tfd->tfd_gen = node->tn_gen; 1729 tfd->tfd_id = node->tn_id; 1730 1731 return (0); 1732 } 1733 1734 static int 1735 tmpfs_whiteout(struct vop_whiteout_args *ap) 1736 { 1737 struct vnode *dvp = ap->a_dvp; 1738 struct componentname *cnp = ap->a_cnp; 1739 struct tmpfs_dirent *de; 1740 1741 switch (ap->a_flags) { 1742 case LOOKUP: 1743 return (0); 1744 case CREATE: 1745 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1746 if (de != NULL) 1747 return (de->td_node == NULL ? 0 : EEXIST); 1748 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1749 case DELETE: 1750 tmpfs_dir_whiteout_remove(dvp, cnp); 1751 return (0); 1752 default: 1753 panic("tmpfs_whiteout: unknown op"); 1754 } 1755 } 1756 1757 static int 1758 tmpfs_vptocnp_dir(struct tmpfs_node *tn, struct tmpfs_node *tnp, 1759 struct tmpfs_dirent **pde) 1760 { 1761 struct tmpfs_dir_cursor dc; 1762 struct tmpfs_dirent *de; 1763 1764 for (de = tmpfs_dir_first(tnp, &dc); de != NULL; 1765 de = tmpfs_dir_next(tnp, &dc)) { 1766 if (de->td_node == tn) { 1767 *pde = de; 1768 return (0); 1769 } 1770 } 1771 return (ENOENT); 1772 } 1773 1774 static int 1775 tmpfs_vptocnp_fill(struct vnode *vp, struct tmpfs_node *tn, 1776 struct tmpfs_node *tnp, char *buf, size_t *buflen, struct vnode **dvp) 1777 { 1778 struct tmpfs_dirent *de; 1779 int error, i; 1780 1781 error = vn_vget_ino_gen(vp, tmpfs_vn_get_ino_alloc, tnp, LK_SHARED, 1782 dvp); 1783 if (error != 0) 1784 return (error); 1785 error = tmpfs_vptocnp_dir(tn, tnp, &de); 1786 if (error == 0) { 1787 i = *buflen; 1788 i -= de->td_namelen; 1789 if (i < 0) { 1790 error = ENOMEM; 1791 } else { 1792 bcopy(de->ud.td_name, buf + i, de->td_namelen); 1793 *buflen = i; 1794 } 1795 } 1796 if (error == 0) { 1797 if (vp != *dvp) 1798 VOP_UNLOCK(*dvp); 1799 } else { 1800 if (vp != *dvp) 1801 vput(*dvp); 1802 else 1803 vrele(vp); 1804 } 1805 return (error); 1806 } 1807 1808 static int 1809 tmpfs_vptocnp(struct vop_vptocnp_args *ap) 1810 { 1811 struct vnode *vp, **dvp; 1812 struct tmpfs_node *tn, *tnp, *tnp1; 1813 struct tmpfs_dirent *de; 1814 struct tmpfs_mount *tm; 1815 char *buf; 1816 size_t *buflen; 1817 int error; 1818 1819 vp = ap->a_vp; 1820 dvp = ap->a_vpp; 1821 buf = ap->a_buf; 1822 buflen = ap->a_buflen; 1823 1824 tm = VFS_TO_TMPFS(vp->v_mount); 1825 tn = VP_TO_TMPFS_NODE(vp); 1826 if (tn->tn_type == VDIR) { 1827 tnp = tn->tn_dir.tn_parent; 1828 if (tnp == NULL) 1829 return (ENOENT); 1830 tmpfs_ref_node(tnp); 1831 error = tmpfs_vptocnp_fill(vp, tn, tn->tn_dir.tn_parent, buf, 1832 buflen, dvp); 1833 tmpfs_free_node(tm, tnp); 1834 return (error); 1835 } 1836 restart: 1837 TMPFS_LOCK(tm); 1838 restart_locked: 1839 LIST_FOREACH_SAFE(tnp, &tm->tm_nodes_used, tn_entries, tnp1) { 1840 if (tnp->tn_type != VDIR) 1841 continue; 1842 TMPFS_NODE_LOCK(tnp); 1843 tmpfs_ref_node(tnp); 1844 1845 /* 1846 * tn_vnode cannot be instantiated while we hold the 1847 * node lock, so the directory cannot be changed while 1848 * we iterate over it. Do this to avoid instantiating 1849 * vnode for directories which cannot point to our 1850 * node. 1851 */ 1852 error = tnp->tn_vnode == NULL ? tmpfs_vptocnp_dir(tn, tnp, 1853 &de) : 0; 1854 1855 if (error == 0) { 1856 TMPFS_NODE_UNLOCK(tnp); 1857 TMPFS_UNLOCK(tm); 1858 error = tmpfs_vptocnp_fill(vp, tn, tnp, buf, buflen, 1859 dvp); 1860 if (error == 0) { 1861 tmpfs_free_node(tm, tnp); 1862 return (0); 1863 } 1864 if (VN_IS_DOOMED(vp)) { 1865 tmpfs_free_node(tm, tnp); 1866 return (ENOENT); 1867 } 1868 TMPFS_LOCK(tm); 1869 TMPFS_NODE_LOCK(tnp); 1870 } 1871 if (tmpfs_free_node_locked(tm, tnp, false)) { 1872 goto restart; 1873 } else { 1874 KASSERT(tnp->tn_refcount > 0, 1875 ("node %p refcount zero", tnp)); 1876 if (tnp->tn_attached) { 1877 tnp1 = LIST_NEXT(tnp, tn_entries); 1878 TMPFS_NODE_UNLOCK(tnp); 1879 } else { 1880 TMPFS_NODE_UNLOCK(tnp); 1881 goto restart_locked; 1882 } 1883 } 1884 } 1885 TMPFS_UNLOCK(tm); 1886 return (ENOENT); 1887 } 1888 1889 void 1890 tmpfs_extattr_free(struct tmpfs_extattr *ea) 1891 { 1892 free(ea->ea_name, M_TMPFSEA); 1893 free(ea->ea_value, M_TMPFSEA); 1894 free(ea, M_TMPFSEA); 1895 } 1896 1897 static bool 1898 tmpfs_extattr_update_mem(struct tmpfs_mount *tmp, ssize_t size) 1899 { 1900 TMPFS_LOCK(tmp); 1901 if (size > 0 && 1902 !tmpfs_pages_check_avail(tmp, howmany(size, PAGE_SIZE))) { 1903 TMPFS_UNLOCK(tmp); 1904 return (false); 1905 } 1906 if (tmp->tm_ea_memory_inuse + size > tmp->tm_ea_memory_max) { 1907 TMPFS_UNLOCK(tmp); 1908 return (false); 1909 } 1910 tmp->tm_ea_memory_inuse += size; 1911 TMPFS_UNLOCK(tmp); 1912 return (true); 1913 } 1914 1915 static int 1916 tmpfs_deleteextattr(struct vop_deleteextattr_args *ap) 1917 { 1918 struct vnode *vp = ap->a_vp; 1919 struct tmpfs_mount *tmp; 1920 struct tmpfs_node *node; 1921 struct tmpfs_extattr *ea; 1922 size_t namelen; 1923 ssize_t diff; 1924 int error; 1925 1926 node = VP_TO_TMPFS_NODE(vp); 1927 tmp = VFS_TO_TMPFS(vp->v_mount); 1928 if (VN_ISDEV(ap->a_vp)) 1929 return (EOPNOTSUPP); 1930 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1931 ap->a_cred, ap->a_td, VWRITE); 1932 if (error != 0) 1933 return (error); 1934 if (ap->a_name == NULL || ap->a_name[0] == '\0') 1935 return (EINVAL); 1936 namelen = strlen(ap->a_name); 1937 if (namelen > EXTATTR_MAXNAMELEN) 1938 return (EINVAL); 1939 1940 LIST_FOREACH(ea, &node->tn_extattrs, ea_extattrs) { 1941 if (ea->ea_namespace == ap->a_attrnamespace && 1942 namelen == ea->ea_namelen && 1943 memcmp(ap->a_name, ea->ea_name, namelen) == 0) 1944 break; 1945 } 1946 1947 if (ea == NULL) 1948 return (ENOATTR); 1949 LIST_REMOVE(ea, ea_extattrs); 1950 diff = -(sizeof(struct tmpfs_extattr) + namelen + ea->ea_size); 1951 tmpfs_extattr_update_mem(tmp, diff); 1952 tmpfs_extattr_free(ea); 1953 return (0); 1954 } 1955 1956 static int 1957 tmpfs_getextattr(struct vop_getextattr_args *ap) 1958 { 1959 struct vnode *vp = ap->a_vp; 1960 struct tmpfs_node *node; 1961 struct tmpfs_extattr *ea; 1962 size_t namelen; 1963 int error; 1964 1965 node = VP_TO_TMPFS_NODE(vp); 1966 if (VN_ISDEV(ap->a_vp)) 1967 return (EOPNOTSUPP); 1968 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1969 ap->a_cred, ap->a_td, VREAD); 1970 if (error != 0) 1971 return (error); 1972 if (ap->a_name == NULL || ap->a_name[0] == '\0') 1973 return (EINVAL); 1974 namelen = strlen(ap->a_name); 1975 if (namelen > EXTATTR_MAXNAMELEN) 1976 return (EINVAL); 1977 1978 LIST_FOREACH(ea, &node->tn_extattrs, ea_extattrs) { 1979 if (ea->ea_namespace == ap->a_attrnamespace && 1980 namelen == ea->ea_namelen && 1981 memcmp(ap->a_name, ea->ea_name, namelen) == 0) 1982 break; 1983 } 1984 1985 if (ea == NULL) 1986 return (ENOATTR); 1987 if (ap->a_size != NULL) 1988 *ap->a_size = ea->ea_size; 1989 if (ap->a_uio != NULL && ea->ea_size != 0) 1990 error = uiomove(ea->ea_value, ea->ea_size, ap->a_uio); 1991 return (error); 1992 } 1993 1994 static int 1995 tmpfs_listextattr(struct vop_listextattr_args *ap) 1996 { 1997 struct vnode *vp = ap->a_vp; 1998 struct tmpfs_node *node; 1999 struct tmpfs_extattr *ea; 2000 int error; 2001 2002 node = VP_TO_TMPFS_NODE(vp); 2003 if (VN_ISDEV(ap->a_vp)) 2004 return (EOPNOTSUPP); 2005 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 2006 ap->a_cred, ap->a_td, VREAD); 2007 if (error != 0) 2008 return (error); 2009 if (ap->a_size != NULL) 2010 *ap->a_size = 0; 2011 2012 LIST_FOREACH(ea, &node->tn_extattrs, ea_extattrs) { 2013 if (ea->ea_namespace != ap->a_attrnamespace) 2014 continue; 2015 if (ap->a_size != NULL) 2016 *ap->a_size += ea->ea_namelen + 1; 2017 if (ap->a_uio != NULL) { 2018 error = uiomove(&ea->ea_namelen, 1, ap->a_uio); 2019 if (error != 0) 2020 break; 2021 error = uiomove(ea->ea_name, ea->ea_namelen, ap->a_uio); 2022 if (error != 0) 2023 break; 2024 } 2025 } 2026 2027 return (error); 2028 } 2029 2030 static int 2031 tmpfs_setextattr(struct vop_setextattr_args *ap) 2032 { 2033 struct vnode *vp = ap->a_vp; 2034 struct tmpfs_mount *tmp; 2035 struct tmpfs_node *node; 2036 struct tmpfs_extattr *ea; 2037 struct tmpfs_extattr *new_ea; 2038 size_t attr_size; 2039 size_t namelen; 2040 ssize_t diff; 2041 int error; 2042 2043 node = VP_TO_TMPFS_NODE(vp); 2044 tmp = VFS_TO_TMPFS(vp->v_mount); 2045 attr_size = ap->a_uio->uio_resid; 2046 diff = 0; 2047 if (VN_ISDEV(ap->a_vp)) 2048 return (EOPNOTSUPP); 2049 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 2050 ap->a_cred, ap->a_td, VWRITE); 2051 if (error != 0) 2052 return (error); 2053 if (ap->a_name == NULL || ap->a_name[0] == '\0') 2054 return (EINVAL); 2055 namelen = strlen(ap->a_name); 2056 if (namelen > EXTATTR_MAXNAMELEN) 2057 return (EINVAL); 2058 2059 LIST_FOREACH(ea, &node->tn_extattrs, ea_extattrs) { 2060 if (ea->ea_namespace == ap->a_attrnamespace && 2061 namelen == ea->ea_namelen && 2062 memcmp(ap->a_name, ea->ea_name, namelen) == 0) { 2063 diff -= sizeof(struct tmpfs_extattr) + ea->ea_namelen + 2064 ea->ea_size; 2065 break; 2066 } 2067 } 2068 2069 diff += sizeof(struct tmpfs_extattr) + namelen + attr_size; 2070 if (!tmpfs_extattr_update_mem(tmp, diff)) 2071 return (ENOSPC); 2072 new_ea = malloc(sizeof(struct tmpfs_extattr), M_TMPFSEA, M_WAITOK); 2073 new_ea->ea_namespace = ap->a_attrnamespace; 2074 new_ea->ea_name = malloc(namelen, M_TMPFSEA, M_WAITOK); 2075 new_ea->ea_namelen = namelen; 2076 memcpy(new_ea->ea_name, ap->a_name, namelen); 2077 if (attr_size != 0) { 2078 new_ea->ea_value = malloc(attr_size, M_TMPFSEA, M_WAITOK); 2079 new_ea->ea_size = attr_size; 2080 error = uiomove(new_ea->ea_value, attr_size, ap->a_uio); 2081 } else { 2082 new_ea->ea_value = NULL; 2083 new_ea->ea_size = 0; 2084 } 2085 if (error != 0) { 2086 tmpfs_extattr_update_mem(tmp, -diff); 2087 tmpfs_extattr_free(new_ea); 2088 return (error); 2089 } 2090 if (ea != NULL) { 2091 LIST_REMOVE(ea, ea_extattrs); 2092 tmpfs_extattr_free(ea); 2093 } 2094 LIST_INSERT_HEAD(&node->tn_extattrs, new_ea, ea_extattrs); 2095 return (0); 2096 } 2097 2098 static off_t 2099 tmpfs_seek_data_locked(vm_object_t obj, off_t noff) 2100 { 2101 vm_pindex_t p; 2102 2103 p = swap_pager_seek_data(obj, OFF_TO_IDX(noff)); 2104 if (p == OBJ_MAX_SIZE) 2105 p = obj->size; 2106 return (p == OFF_TO_IDX(noff) ? noff : IDX_TO_OFF(p)); 2107 } 2108 2109 static int 2110 tmpfs_seek_clamp(struct tmpfs_node *tn, off_t *noff, bool seekdata) 2111 { 2112 if (*noff < tn->tn_size) 2113 return (0); 2114 if (seekdata) 2115 return (ENXIO); 2116 *noff = tn->tn_size; 2117 return (0); 2118 } 2119 2120 static off_t 2121 tmpfs_seek_hole_locked(vm_object_t obj, off_t noff) 2122 { 2123 2124 return (IDX_TO_OFF(swap_pager_seek_hole(obj, OFF_TO_IDX(noff)))); 2125 } 2126 2127 static int 2128 tmpfs_seek_datahole(struct vnode *vp, off_t *off, bool seekdata) 2129 { 2130 struct tmpfs_node *tn; 2131 vm_object_t obj; 2132 off_t noff; 2133 int error; 2134 2135 if (vp->v_type != VREG) 2136 return (ENOTTY); 2137 tn = VP_TO_TMPFS_NODE(vp); 2138 noff = *off; 2139 if (noff < 0) 2140 return (ENXIO); 2141 error = tmpfs_seek_clamp(tn, &noff, seekdata); 2142 if (error != 0) 2143 return (error); 2144 obj = tn->tn_reg.tn_aobj; 2145 2146 VM_OBJECT_RLOCK(obj); 2147 noff = seekdata ? tmpfs_seek_data_locked(obj, noff) : 2148 tmpfs_seek_hole_locked(obj, noff); 2149 VM_OBJECT_RUNLOCK(obj); 2150 2151 error = tmpfs_seek_clamp(tn, &noff, seekdata); 2152 if (error == 0) 2153 *off = noff; 2154 return (error); 2155 } 2156 2157 static int 2158 tmpfs_ioctl(struct vop_ioctl_args *ap) 2159 { 2160 struct vnode *vp = ap->a_vp; 2161 int error = 0; 2162 2163 switch (ap->a_command) { 2164 case FIOSEEKDATA: 2165 case FIOSEEKHOLE: 2166 error = vn_lock(vp, LK_SHARED); 2167 if (error != 0) { 2168 error = EBADF; 2169 break; 2170 } 2171 error = tmpfs_seek_datahole(vp, (off_t *)ap->a_data, 2172 ap->a_command == FIOSEEKDATA); 2173 VOP_UNLOCK(vp); 2174 break; 2175 default: 2176 error = ENOTTY; 2177 break; 2178 } 2179 return (error); 2180 } 2181 2182 /* 2183 * Vnode operations vector used for files stored in a tmpfs file system. 2184 */ 2185 struct vop_vector tmpfs_vnodeop_entries = { 2186 .vop_default = &default_vnodeops, 2187 .vop_lookup = vfs_cache_lookup, 2188 .vop_cachedlookup = tmpfs_cached_lookup, 2189 .vop_create = tmpfs_create, 2190 .vop_mknod = tmpfs_mknod, 2191 .vop_open = tmpfs_open, 2192 .vop_close = tmpfs_close, 2193 .vop_fplookup_vexec = tmpfs_fplookup_vexec, 2194 .vop_fplookup_symlink = tmpfs_fplookup_symlink, 2195 .vop_access = tmpfs_access, 2196 .vop_stat = tmpfs_stat, 2197 .vop_getattr = tmpfs_getattr, 2198 .vop_setattr = tmpfs_setattr, 2199 .vop_read = tmpfs_read, 2200 .vop_read_pgcache = tmpfs_read_pgcache, 2201 .vop_write = tmpfs_write, 2202 .vop_deallocate = tmpfs_deallocate, 2203 .vop_fsync = tmpfs_fsync, 2204 .vop_remove = tmpfs_remove, 2205 .vop_link = tmpfs_link, 2206 .vop_rename = tmpfs_rename, 2207 .vop_mkdir = tmpfs_mkdir, 2208 .vop_rmdir = tmpfs_rmdir, 2209 .vop_symlink = tmpfs_symlink, 2210 .vop_readdir = tmpfs_readdir, 2211 .vop_readlink = tmpfs_readlink, 2212 .vop_inactive = tmpfs_inactive, 2213 .vop_need_inactive = tmpfs_need_inactive, 2214 .vop_reclaim = tmpfs_reclaim, 2215 .vop_print = tmpfs_print, 2216 .vop_pathconf = tmpfs_pathconf, 2217 .vop_vptofh = tmpfs_vptofh, 2218 .vop_whiteout = tmpfs_whiteout, 2219 .vop_bmap = VOP_EOPNOTSUPP, 2220 .vop_vptocnp = tmpfs_vptocnp, 2221 .vop_lock1 = vop_lock, 2222 .vop_unlock = vop_unlock, 2223 .vop_islocked = vop_islocked, 2224 .vop_deleteextattr = tmpfs_deleteextattr, 2225 .vop_getextattr = tmpfs_getextattr, 2226 .vop_listextattr = tmpfs_listextattr, 2227 .vop_setextattr = tmpfs_setextattr, 2228 .vop_add_writecount = vop_stdadd_writecount_nomsync, 2229 .vop_ioctl = tmpfs_ioctl, 2230 }; 2231 VFS_VOP_VECTOR_REGISTER(tmpfs_vnodeop_entries); 2232 2233 /* 2234 * Same vector for mounts which do not use namecache. 2235 */ 2236 struct vop_vector tmpfs_vnodeop_nonc_entries = { 2237 .vop_default = &tmpfs_vnodeop_entries, 2238 .vop_lookup = tmpfs_lookup, 2239 }; 2240 VFS_VOP_VECTOR_REGISTER(tmpfs_vnodeop_nonc_entries); 2241