tmpfs_vnops.c revision 1.29
1/* $NetBSD: tmpfs_vnops.c,v 1.29 2006/11/05 16:59:18 jmmv Exp $ */ 2 3/* 4 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 9 * 2005 program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40/* 41 * tmpfs vnode interface. 42 */ 43 44#include <sys/cdefs.h> 45__KERNEL_RCSID(0, "$NetBSD: tmpfs_vnops.c,v 1.29 2006/11/05 16:59:18 jmmv Exp $"); 46 47#include <sys/param.h> 48#include <sys/dirent.h> 49#include <sys/fcntl.h> 50#include <sys/event.h> 51#include <sys/malloc.h> 52#include <sys/namei.h> 53#include <sys/proc.h> 54#include <sys/stat.h> 55#include <sys/uio.h> 56#include <sys/unistd.h> 57#include <sys/vnode.h> 58#include <sys/lockf.h> 59#include <sys/kauth.h> 60 61#include <uvm/uvm.h> 62 63#include <miscfs/fifofs/fifo.h> 64#include <fs/tmpfs/tmpfs_vnops.h> 65#include <fs/tmpfs/tmpfs.h> 66 67/* --------------------------------------------------------------------- */ 68 69/* 70 * vnode operations vector used for files stored in a tmpfs file system. 71 */ 72int (**tmpfs_vnodeop_p)(void *); 73const struct vnodeopv_entry_desc tmpfs_vnodeop_entries[] = { 74 { &vop_default_desc, vn_default_error }, 75 { &vop_lookup_desc, tmpfs_lookup }, 76 { &vop_create_desc, tmpfs_create }, 77 { &vop_mknod_desc, tmpfs_mknod }, 78 { &vop_open_desc, tmpfs_open }, 79 { &vop_close_desc, tmpfs_close }, 80 { &vop_access_desc, tmpfs_access }, 81 { &vop_getattr_desc, tmpfs_getattr }, 82 { &vop_setattr_desc, tmpfs_setattr }, 83 { &vop_read_desc, tmpfs_read }, 84 { &vop_write_desc, tmpfs_write }, 85 { &vop_ioctl_desc, tmpfs_ioctl }, 86 { &vop_fcntl_desc, tmpfs_fcntl }, 87 { &vop_poll_desc, tmpfs_poll }, 88 { &vop_kqfilter_desc, tmpfs_kqfilter }, 89 { &vop_revoke_desc, tmpfs_revoke }, 90 { &vop_mmap_desc, tmpfs_mmap }, 91 { &vop_fsync_desc, tmpfs_fsync }, 92 { &vop_seek_desc, tmpfs_seek }, 93 { &vop_remove_desc, tmpfs_remove }, 94 { &vop_link_desc, tmpfs_link }, 95 { &vop_rename_desc, tmpfs_rename }, 96 { &vop_mkdir_desc, tmpfs_mkdir }, 97 { &vop_rmdir_desc, tmpfs_rmdir }, 98 { &vop_symlink_desc, tmpfs_symlink }, 99 { &vop_readdir_desc, tmpfs_readdir }, 100 { &vop_readlink_desc, tmpfs_readlink }, 101 { &vop_abortop_desc, tmpfs_abortop }, 102 { &vop_inactive_desc, tmpfs_inactive }, 103 { &vop_reclaim_desc, tmpfs_reclaim }, 104 { &vop_lock_desc, tmpfs_lock }, 105 { &vop_unlock_desc, tmpfs_unlock }, 106 { &vop_bmap_desc, tmpfs_bmap }, 107 { &vop_strategy_desc, tmpfs_strategy }, 108 { &vop_print_desc, tmpfs_print }, 109 { &vop_pathconf_desc, tmpfs_pathconf }, 110 { &vop_islocked_desc, tmpfs_islocked }, 111 { &vop_advlock_desc, tmpfs_advlock }, 112 { &vop_lease_desc, tmpfs_lease }, 113 { &vop_bwrite_desc, tmpfs_bwrite }, 114 { &vop_getpages_desc, tmpfs_getpages }, 115 { &vop_putpages_desc, tmpfs_putpages }, 116 { NULL, NULL } 117}; 118const struct vnodeopv_desc tmpfs_vnodeop_opv_desc = 119 { &tmpfs_vnodeop_p, tmpfs_vnodeop_entries }; 120 121/* --------------------------------------------------------------------- */ 122 123int 124tmpfs_lookup(void *v) 125{ 126 struct vnode *dvp = ((struct vop_lookup_args *)v)->a_dvp; 127 struct vnode **vpp = ((struct vop_lookup_args *)v)->a_vpp; 128 struct componentname *cnp = ((struct vop_lookup_args *)v)->a_cnp; 129 130 int error; 131 struct tmpfs_dirent *de; 132 struct tmpfs_node *dnode; 133 134 KASSERT(VOP_ISLOCKED(dvp)); 135 136 dnode = VP_TO_TMPFS_DIR(dvp); 137 *vpp = NULL; 138 139 /* Check accessibility of requested node as a first step. */ 140 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_lwp); 141 if (error != 0) 142 goto out; 143 144 /* If requesting the last path component on a read-only file system 145 * with a write operation, deny it. */ 146 if ((cnp->cn_flags & ISLASTCN) && 147 (dvp->v_mount->mnt_flag & MNT_RDONLY) && 148 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) { 149 error = EROFS; 150 goto out; 151 } 152 153 /* Avoid doing a linear scan of the directory if the requested 154 * directory/name couple is already in the cache. */ 155 error = cache_lookup(dvp, vpp, cnp); 156 if (error >= 0) 157 goto out; 158 159 /* We cannot be requesting the parent directory of the root node. */ 160 KASSERT(IMPLIES(dnode->tn_type == VDIR && 161 dnode->tn_spec.tn_dir.tn_parent == dnode, 162 !(cnp->cn_flags & ISDOTDOT))); 163 164 if (cnp->cn_flags & ISDOTDOT) { 165 VOP_UNLOCK(dvp, 0); 166 167 /* Allocate a new vnode on the matching entry. */ 168 error = tmpfs_alloc_vp(dvp->v_mount, 169 dnode->tn_spec.tn_dir.tn_parent, vpp); 170 171 if (cnp->cn_flags & LOCKPARENT && 172 cnp->cn_flags & ISLASTCN) { 173 if (vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY) != 0) 174 cnp->cn_flags |= PDIRUNLOCK; 175 } 176 dnode->tn_spec.tn_dir.tn_parent->tn_lookup_dirent = NULL; 177 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 178 VREF(dvp); 179 *vpp = dvp; 180 dnode->tn_lookup_dirent = NULL; 181 error = 0; 182 } else { 183 de = tmpfs_dir_lookup(dnode, cnp); 184 if (de == NULL) { 185 /* The entry was not found in the directory. 186 * This is OK iff we are creating or renaming an 187 * entry and are working on the last component of 188 * the path name. */ 189 if ((cnp->cn_flags & ISLASTCN) && 190 (cnp->cn_nameiop == CREATE || \ 191 cnp->cn_nameiop == RENAME)) { 192 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 193 cnp->cn_lwp); 194 if (error != 0) 195 goto out; 196 197 /* Keep the component name in the buffer for 198 * future uses. */ 199 cnp->cn_flags |= SAVENAME; 200 201 error = EJUSTRETURN; 202 } else 203 error = ENOENT; 204 } else { 205 struct tmpfs_node *tnode; 206 207 /* The entry was found, so get its associated 208 * tmpfs_node. */ 209 tnode = de->td_node; 210 211 /* If we are not at the last path component and 212 * found a non-directory or non-link entry (which 213 * may itself be pointing to a directory), raise 214 * an error. */ 215 if ((tnode->tn_type != VDIR && 216 tnode->tn_type != VLNK) && 217 !(cnp->cn_flags & ISLASTCN)) { 218 error = ENOTDIR; 219 goto out; 220 } 221 222 /* If we are deleting or renaming the entry, keep 223 * track of its tmpfs_dirent so that it can be 224 * easily deleted later. */ 225 if ((cnp->cn_flags & ISLASTCN) && 226 (cnp->cn_nameiop == DELETE || 227 cnp->cn_nameiop == RENAME)) { 228 if ((dnode->tn_mode & S_ISTXT) != 0 && 229 kauth_cred_geteuid(cnp->cn_cred) != 0 && 230 kauth_cred_geteuid(cnp->cn_cred) != dnode->tn_uid && 231 kauth_cred_geteuid(cnp->cn_cred) != tnode->tn_uid) 232 return EPERM; 233 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 234 cnp->cn_lwp); 235 if (error != 0) 236 goto out; 237 tnode->tn_lookup_dirent = de; 238 } 239 240 /* Allocate a new vnode on the matching entry. */ 241 error = tmpfs_alloc_vp(dvp->v_mount, tnode, vpp); 242 243 if (error == 0 && (!(cnp->cn_flags & LOCKPARENT) || 244 !(cnp->cn_flags & ISLASTCN))) 245 VOP_UNLOCK(dvp, 0); 246 } 247 } 248 249 /* Store the result of this lookup in the cache. Avoid this if the 250 * request was for creation, as it does not improve timings on 251 * emprical tests. */ 252 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 253 cache_enter(dvp, *vpp, cnp); 254 255out: 256 /* If there were no errors, *vpp cannot be null and it must be 257 * locked. */ 258 KASSERT(IFF(error == 0, *vpp != NULL && VOP_ISLOCKED(*vpp))); 259 260 /* dvp has to be locked if: 261 * - There were errors and relocking of dvp did not fail. 262 * - We are doing a '..' lookup, relocking of dvp did not fail 263 * (PDIRUNLOCK is unset) and LOCKPARENT or ISLASTCN are not set. 264 * - LOCKPARENT and ISLASTCN are set. */ 265 KASSERT(IMPLIES( 266 (error != 0 && !(cnp->cn_flags & PDIRUNLOCK)) || 267 (cnp->cn_flags & ISDOTDOT && !(cnp->cn_flags & PDIRUNLOCK) && 268 ((cnp->cn_flags & LOCKPARENT) && (cnp->cn_flags & ISLASTCN))) || 269 (cnp->cn_flags & LOCKPARENT && cnp->cn_flags & ISLASTCN) 270 , 271 VOP_ISLOCKED(dvp))); 272 273 return error; 274} 275 276/* --------------------------------------------------------------------- */ 277 278int 279tmpfs_create(void *v) 280{ 281 struct vnode *dvp = ((struct vop_create_args *)v)->a_dvp; 282 struct vnode **vpp = ((struct vop_create_args *)v)->a_vpp; 283 struct componentname *cnp = ((struct vop_create_args *)v)->a_cnp; 284 struct vattr *vap = ((struct vop_create_args *)v)->a_vap; 285 286 KASSERT(vap->va_type == VREG || vap->va_type == VSOCK); 287 288 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 289} 290/* --------------------------------------------------------------------- */ 291 292int 293tmpfs_mknod(void *v) 294{ 295 struct vnode *dvp = ((struct vop_mknod_args *)v)->a_dvp; 296 struct vnode **vpp = ((struct vop_mknod_args *)v)->a_vpp; 297 struct componentname *cnp = ((struct vop_mknod_args *)v)->a_cnp; 298 struct vattr *vap = ((struct vop_mknod_args *)v)->a_vap; 299 300 if (vap->va_type != VBLK && vap->va_type != VCHR && 301 vap->va_type != VFIFO) 302 return EINVAL; 303 304 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 305} 306 307/* --------------------------------------------------------------------- */ 308 309int 310tmpfs_open(void *v) 311{ 312 struct vnode *vp = ((struct vop_open_args *)v)->a_vp; 313 int mode = ((struct vop_open_args *)v)->a_mode; 314 315 int error; 316 struct tmpfs_node *node; 317 318 KASSERT(VOP_ISLOCKED(vp)); 319 320 node = VP_TO_TMPFS_NODE(vp); 321 KASSERT(node->tn_links > 0); 322 323 /* If the file is marked append-only, deny write requests. */ 324 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 325 error = EPERM; 326 else 327 error = 0; 328 329 KASSERT(VOP_ISLOCKED(vp)); 330 331 return error; 332} 333 334/* --------------------------------------------------------------------- */ 335 336int 337tmpfs_close(void *v) 338{ 339 struct vnode *vp = ((struct vop_close_args *)v)->a_vp; 340 341 struct tmpfs_node *node; 342 343 KASSERT(VOP_ISLOCKED(vp)); 344 345 node = VP_TO_TMPFS_NODE(vp); 346 347 if (node->tn_links > 0) { 348 /* Update node times. No need to do it if the node has 349 * been deleted, because it will vanish after we return. */ 350 tmpfs_update(vp, NULL, NULL, UPDATE_CLOSE); 351 } 352 353 return 0; 354} 355 356/* --------------------------------------------------------------------- */ 357 358int 359tmpfs_access(void *v) 360{ 361 struct vnode *vp = ((struct vop_access_args *)v)->a_vp; 362 int mode = ((struct vop_access_args *)v)->a_mode; 363 kauth_cred_t cred = ((struct vop_access_args *)v)->a_cred; 364 365 int error; 366 struct tmpfs_node *node; 367 368 KASSERT(VOP_ISLOCKED(vp)); 369 370 node = VP_TO_TMPFS_NODE(vp); 371 372 switch (vp->v_type) { 373 case VDIR: 374 /* FALLTHROUGH */ 375 case VLNK: 376 /* FALLTHROUGH */ 377 case VREG: 378 if (mode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 379 error = EROFS; 380 goto out; 381 } 382 break; 383 384 case VBLK: 385 /* FALLTHROUGH */ 386 case VCHR: 387 /* FALLTHROUGH */ 388 case VSOCK: 389 /* FALLTHROUGH */ 390 case VFIFO: 391 break; 392 393 default: 394 error = EINVAL; 395 goto out; 396 } 397 398 if (mode & VWRITE && node->tn_flags & IMMUTABLE) { 399 error = EPERM; 400 goto out; 401 } 402 403 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 404 node->tn_gid, mode, cred); 405 406out: 407 KASSERT(VOP_ISLOCKED(vp)); 408 409 return error; 410} 411 412/* --------------------------------------------------------------------- */ 413 414int 415tmpfs_getattr(void *v) 416{ 417 struct vnode *vp = ((struct vop_getattr_args *)v)->a_vp; 418 struct vattr *vap = ((struct vop_getattr_args *)v)->a_vap; 419 420 struct tmpfs_node *node; 421 422 node = VP_TO_TMPFS_NODE(vp); 423 424 VATTR_NULL(vap); 425 426 tmpfs_itimes(vp, NULL, NULL); 427 428 vap->va_type = vp->v_type; 429 vap->va_mode = node->tn_mode; 430 vap->va_nlink = node->tn_links; 431 vap->va_uid = node->tn_uid; 432 vap->va_gid = node->tn_gid; 433 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 434 vap->va_fileid = node->tn_id; 435 vap->va_size = node->tn_size; 436 vap->va_blocksize = PAGE_SIZE; 437 vap->va_atime = node->tn_atime; 438 vap->va_mtime = node->tn_mtime; 439 vap->va_ctime = node->tn_ctime; 440 vap->va_birthtime = node->tn_birthtime; 441 vap->va_gen = node->tn_gen; 442 vap->va_flags = node->tn_flags; 443 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 444 node->tn_spec.tn_dev.tn_rdev : VNOVAL; 445 vap->va_bytes = round_page(node->tn_size); 446 vap->va_filerev = VNOVAL; 447 vap->va_vaflags = 0; 448 vap->va_spare = VNOVAL; /* XXX */ 449 450 return 0; 451} 452 453/* --------------------------------------------------------------------- */ 454 455/* XXX Should this operation be atomic? I think it should, but code in 456 * XXX other places (e.g., ufs) doesn't seem to be... */ 457int 458tmpfs_setattr(void *v) 459{ 460 struct vnode *vp = ((struct vop_setattr_args *)v)->a_vp; 461 struct vattr *vap = ((struct vop_setattr_args *)v)->a_vap; 462 kauth_cred_t cred = ((struct vop_setattr_args *)v)->a_cred; 463 struct lwp *l = ((struct vop_setattr_args *)v)->a_l; 464 465 int error; 466 467 KASSERT(VOP_ISLOCKED(vp)); 468 469 error = 0; 470 471 /* Abort if any unsettable attribute is given. */ 472 if (vap->va_type != VNON || 473 vap->va_nlink != VNOVAL || 474 vap->va_fsid != VNOVAL || 475 vap->va_fileid != VNOVAL || 476 vap->va_blocksize != VNOVAL || 477 vap->va_ctime.tv_sec != VNOVAL || 478 vap->va_ctime.tv_nsec != VNOVAL || 479 vap->va_birthtime.tv_sec != VNOVAL || 480 vap->va_birthtime.tv_nsec != VNOVAL || 481 vap->va_gen != VNOVAL || 482 vap->va_rdev != VNOVAL || 483 vap->va_bytes != VNOVAL) 484 error = EINVAL; 485 486 if (error == 0 && (vap->va_flags != VNOVAL)) 487 error = tmpfs_chflags(vp, vap->va_flags, cred, l); 488 489 if (error == 0 && (vap->va_size != VNOVAL)) 490 error = tmpfs_chsize(vp, vap->va_size, cred, l); 491 492 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 493 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 494 495 if (error == 0 && (vap->va_mode != VNOVAL)) 496 error = tmpfs_chmod(vp, vap->va_mode, cred, l); 497 498 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 499 vap->va_atime.tv_nsec != VNOVAL) || 500 (vap->va_mtime.tv_sec != VNOVAL && 501 vap->va_mtime.tv_nsec != VNOVAL))) 502 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime, 503 vap->va_vaflags, cred, l); 504 505 /* Update the node times. We give preference to the error codes 506 * generated by this function rather than the ones that may arise 507 * from tmpfs_update. */ 508 tmpfs_update(vp, NULL, NULL, 0); 509 510 KASSERT(VOP_ISLOCKED(vp)); 511 512 return error; 513} 514 515/* --------------------------------------------------------------------- */ 516 517int 518tmpfs_read(void *v) 519{ 520 struct vnode *vp = ((struct vop_read_args *)v)->a_vp; 521 struct uio *uio = ((struct vop_read_args *)v)->a_uio; 522 523 int error; 524 int flags; 525 struct tmpfs_node *node; 526 struct uvm_object *uobj; 527 528 KASSERT(VOP_ISLOCKED(vp)); 529 530 node = VP_TO_TMPFS_NODE(vp); 531 532 if (vp->v_type != VREG) { 533 error = EISDIR; 534 goto out; 535 } 536 537 if (uio->uio_offset < 0) { 538 error = EINVAL; 539 goto out; 540 } 541 542 node->tn_status |= TMPFS_NODE_ACCESSED; 543 544 uobj = node->tn_spec.tn_reg.tn_aobj; 545 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 546 error = 0; 547 while (error == 0 && uio->uio_resid > 0) { 548 vsize_t len; 549 void *win; 550 551 if (node->tn_size <= uio->uio_offset) 552 break; 553 554 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 555 if (len == 0) 556 break; 557 558 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 559 UBC_READ); 560 error = uiomove(win, len, uio); 561 ubc_release(win, flags); 562 } 563 564out: 565 KASSERT(VOP_ISLOCKED(vp)); 566 567 return error; 568} 569 570/* --------------------------------------------------------------------- */ 571 572int 573tmpfs_write(void *v) 574{ 575 struct vnode *vp = ((struct vop_write_args *)v)->a_vp; 576 struct uio *uio = ((struct vop_write_args *)v)->a_uio; 577 int ioflag = ((struct vop_write_args *)v)->a_ioflag; 578 579 boolean_t extended; 580 int error; 581 int flags; 582 off_t oldsize; 583 struct tmpfs_node *node; 584 struct uvm_object *uobj; 585 586 KASSERT(VOP_ISLOCKED(vp)); 587 588 node = VP_TO_TMPFS_NODE(vp); 589 oldsize = node->tn_size; 590 591 if (uio->uio_offset < 0 || vp->v_type != VREG) { 592 error = EINVAL; 593 goto out; 594 } 595 596 if (uio->uio_resid == 0) { 597 error = 0; 598 goto out; 599 } 600 601 if (ioflag & IO_APPEND) 602 uio->uio_offset = node->tn_size; 603 604 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 605 if (extended) { 606 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid); 607 if (error != 0) 608 goto out; 609 } 610 611 uobj = node->tn_spec.tn_reg.tn_aobj; 612 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 613 error = 0; 614 while (error == 0 && uio->uio_resid > 0) { 615 vsize_t len; 616 void *win; 617 618 len = MIN(node->tn_size - uio->uio_offset, uio->uio_resid); 619 if (len == 0) 620 break; 621 622 win = ubc_alloc(uobj, uio->uio_offset, &len, UVM_ADV_NORMAL, 623 UBC_WRITE); 624 error = uiomove(win, len, uio); 625 ubc_release(win, flags); 626 } 627 628 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 629 (extended ? TMPFS_NODE_CHANGED : 0); 630 631 if (error != 0) 632 (void)tmpfs_reg_resize(vp, oldsize); 633 634out: 635 KASSERT(VOP_ISLOCKED(vp)); 636 KASSERT(IMPLIES(error == 0, uio->uio_resid == 0)); 637 KASSERT(IMPLIES(error != 0, oldsize == node->tn_size)); 638 639 return error; 640} 641 642/* --------------------------------------------------------------------- */ 643 644int 645tmpfs_fsync(void *v) 646{ 647 struct vnode *vp = ((struct vop_fsync_args *)v)->a_vp; 648 649 KASSERT(VOP_ISLOCKED(vp)); 650 651 tmpfs_update(vp, NULL, NULL, 0); 652 653 return 0; 654} 655 656/* --------------------------------------------------------------------- */ 657 658int 659tmpfs_remove(void *v) 660{ 661 struct vnode *dvp = ((struct vop_remove_args *)v)->a_dvp; 662 struct vnode *vp = ((struct vop_remove_args *)v)->a_vp; 663 664 int error; 665 struct tmpfs_dirent *de; 666 struct tmpfs_mount *tmp; 667 struct tmpfs_node *dnode; 668 struct tmpfs_node *node; 669 670 KASSERT(VOP_ISLOCKED(dvp)); 671 KASSERT(VOP_ISLOCKED(vp)); 672 673 dnode = VP_TO_TMPFS_DIR(dvp); 674 node = VP_TO_TMPFS_NODE(vp); 675 tmp = VFS_TO_TMPFS(vp->v_mount); 676 de = node->tn_lookup_dirent; 677 KASSERT(de != NULL); 678 679 /* XXX: Why isn't this done by the caller? */ 680 if (vp->v_type == VDIR) { 681 error = EISDIR; 682 goto out; 683 } 684 685 /* Files marked as immutable or append-only cannot be deleted. */ 686 if (node->tn_flags & (IMMUTABLE | APPEND)) { 687 error = EPERM; 688 goto out; 689 } 690 691 /* Remove the entry from the directory; as it is a file, we do not 692 * have to change the number of hard links of the directory. */ 693 tmpfs_dir_detach(dvp, de); 694 695 /* Notify interested parties about the modification of dvp. 696 * The removal of vp is notified when it is reclaimed. */ 697 VN_KNOTE(dvp, NOTE_WRITE); 698 699 /* Free the directory entry we just deleted. Note that the node 700 * referred by it will not be removed until the vnode is really 701 * reclaimed. */ 702 tmpfs_free_dirent(tmp, de, TRUE); 703 704 error = 0; 705 706out: 707 vput(dvp); 708 vput(vp); 709 710 KASSERT(!VOP_ISLOCKED(dvp)); 711 712 return error; 713} 714 715/* --------------------------------------------------------------------- */ 716 717int 718tmpfs_link(void *v) 719{ 720 struct vnode *dvp = ((struct vop_link_args *)v)->a_dvp; 721 struct vnode *vp = ((struct vop_link_args *)v)->a_vp; 722 struct componentname *cnp = ((struct vop_link_args *)v)->a_cnp; 723 724 int error; 725 struct tmpfs_dirent *de; 726 struct tmpfs_node *dnode; 727 struct tmpfs_node *node; 728 729 KASSERT(VOP_ISLOCKED(dvp)); 730 KASSERT(!VOP_ISLOCKED(vp)); 731 KASSERT(cnp->cn_flags & HASBUF); 732 KASSERT(dvp != vp); /* XXX When can this be false? */ 733 734 dnode = VP_TO_TMPFS_DIR(dvp); 735 node = VP_TO_TMPFS_NODE(vp); 736 737 /* Lock vp because we will need to run tmpfs_update over it, which 738 * needs the vnode to be locked. */ 739 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 740 if (error != 0) 741 goto out; 742 743 /* XXX: Why aren't the following two tests done by the caller? */ 744 745 /* Hard links of directories are forbidden. */ 746 if (vp->v_type == VDIR) { 747 error = EPERM; 748 goto out; 749 } 750 751 /* Cannot create cross-device links. */ 752 if (dvp->v_mount != vp->v_mount) { 753 error = EXDEV; 754 goto out; 755 } 756 757 /* Ensure that we do not overflow the maximum number of links imposed 758 * by the system. */ 759 KASSERT(node->tn_links <= LINK_MAX); 760 if (node->tn_links == LINK_MAX) { 761 error = EMLINK; 762 goto out; 763 } 764 765 /* We cannot create links of files marked immutable or append-only. */ 766 if (node->tn_flags & (IMMUTABLE | APPEND)) { 767 error = EPERM; 768 goto out; 769 } 770 771 /* Allocate a new directory entry to represent the node. */ 772 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 773 cnp->cn_nameptr, cnp->cn_namelen, &de); 774 if (error != 0) 775 goto out; 776 777 /* Insert the new directory entry into the appropriate directory. */ 778 tmpfs_dir_attach(dvp, de); 779 VN_KNOTE(dvp, NOTE_WRITE); 780 781 /* vp link count has changed, so update node times. */ 782 node->tn_status |= TMPFS_NODE_CHANGED; 783 tmpfs_update(vp, NULL, NULL, 0); 784 785 error = 0; 786 787out: 788 if (VOP_ISLOCKED(vp)) 789 VOP_UNLOCK(vp, 0); 790 791 PNBUF_PUT(cnp->cn_pnbuf); 792 793 vput(dvp); 794 795 /* XXX Locking status of dvp does not match manual page. */ 796 KASSERT(!VOP_ISLOCKED(dvp)); 797 KASSERT(!VOP_ISLOCKED(vp)); 798 799 return error; 800} 801 802/* --------------------------------------------------------------------- */ 803 804int 805tmpfs_rename(void *v) 806{ 807 struct vnode *fdvp = ((struct vop_rename_args *)v)->a_fdvp; 808 struct vnode *fvp = ((struct vop_rename_args *)v)->a_fvp; 809 struct componentname *fcnp = ((struct vop_rename_args *)v)->a_fcnp; 810 struct vnode *tdvp = ((struct vop_rename_args *)v)->a_tdvp; 811 struct vnode *tvp = ((struct vop_rename_args *)v)->a_tvp; 812 struct componentname *tcnp = ((struct vop_rename_args *)v)->a_tcnp; 813 814 char *newname; 815 int error; 816 struct tmpfs_dirent *de; 817 struct tmpfs_mount *tmp; 818 struct tmpfs_node *fdnode; 819 struct tmpfs_node *fnode; 820 struct tmpfs_node *tdnode; 821 822 KASSERT(VOP_ISLOCKED(tdvp)); 823 KASSERT(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 824 KASSERT(fcnp->cn_flags & HASBUF); 825 KASSERT(tcnp->cn_flags & HASBUF); 826 827 fdnode = VP_TO_TMPFS_DIR(fdvp); 828 fnode = VP_TO_TMPFS_NODE(fvp); 829 de = fnode->tn_lookup_dirent; 830 831 /* Disallow cross-device renames. 832 * XXX Why isn't this done by the caller? */ 833 if (fvp->v_mount != tdvp->v_mount || 834 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 835 error = EXDEV; 836 goto out; 837 } 838 839 tmp = VFS_TO_TMPFS(tdvp->v_mount); 840 tdnode = VP_TO_TMPFS_DIR(tdvp); 841 842 /* If source and target are the same file, there is nothing to do. */ 843 if (fvp == tvp) { 844 error = 0; 845 goto out; 846 } 847 848 /* Avoid manipulating '.' and '..' entries. */ 849 if (de == NULL) { 850 KASSERT(fvp->v_type == VDIR); 851 error = EINVAL; 852 goto out; 853 } 854 KASSERT(de->td_node == fnode); 855 856 /* If we need to move the directory between entries, lock the 857 * source so that we can safely operate on it. */ 858 if (fdnode != tdnode) { 859 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); 860 if (error != 0) 861 goto out; 862 } 863 864 /* Ensure that we have enough memory to hold the new name, if it 865 * has to be changed. */ 866 if (fcnp->cn_namelen != tcnp->cn_namelen || 867 memcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 868 newname = tmpfs_str_pool_get(&tmp->tm_str_pool, 869 tcnp->cn_namelen, 0); 870 if (newname == NULL) { 871 error = ENOSPC; 872 goto out_locked; 873 } 874 } else 875 newname = NULL; 876 877 /* If the node is being moved to another directory, we have to do 878 * the move. */ 879 if (fdnode != tdnode) { 880 /* In case we are moving a directory, we have to adjust its 881 * parent to point to the new parent. */ 882 if (de->td_node->tn_type == VDIR) { 883 struct tmpfs_node *n; 884 885 /* Ensure the target directory is not a child of the 886 * directory being moved. Otherwise, we'd end up 887 * with stale nodes. */ 888 n = tdnode; 889 while (n != n->tn_spec.tn_dir.tn_parent) { 890 if (n == fnode) { 891 error = EINVAL; 892 goto out_locked; 893 } 894 n = n->tn_spec.tn_dir.tn_parent; 895 } 896 897 /* Adjust the parent pointer. */ 898 TMPFS_VALIDATE_DIR(fnode); 899 de->td_node->tn_spec.tn_dir.tn_parent = tdnode; 900 901 /* As a result of changing the target of the '..' 902 * entry, the link count of the source and target 903 * directories has to be adjusted. */ 904 fdnode->tn_links--; 905 tdnode->tn_links++; 906 } 907 908 /* Do the move: just remove the entry from the source directory 909 * and insert it into the target one. */ 910 tmpfs_dir_detach(fdvp, de); 911 tmpfs_dir_attach(tdvp, de); 912 913 /* Notify listeners of fdvp about the change in the directory. 914 * We can do it at this point because we aren't touching fdvp 915 * any more below. */ 916 VN_KNOTE(fdvp, NOTE_WRITE); 917 } 918 919 /* If the name has changed, we need to make it effective by changing 920 * it in the directory entry. */ 921 if (newname != NULL) { 922 KASSERT(tcnp->cn_namelen < MAXNAMLEN); 923 KASSERT(tcnp->cn_namelen < 0xffff); 924 925 tmpfs_str_pool_put(&tmp->tm_str_pool, de->td_name, 926 de->td_namelen); 927 de->td_namelen = (uint16_t)tcnp->cn_namelen; 928 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); 929 de->td_name = newname; 930 931 fnode->tn_status |= TMPFS_NODE_CHANGED; 932 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 933 } 934 935 /* If we are overwriting an entry, we have to remove the old one 936 * from the target directory. */ 937 if (tvp != NULL) { 938 struct tmpfs_node *tnode; 939 940 tnode = VP_TO_TMPFS_NODE(tvp); 941 942 /* The source node cannot be a directory in this case. */ 943 KASSERT(fnode->tn_type != VDIR); 944 945 /* Remove the old entry from the target directory. */ 946 de = tnode->tn_lookup_dirent; 947 tmpfs_dir_detach(tdvp, de); 948 949 /* Free the directory entry we just deleted. Note that the 950 * node referred by it will not be removed until the vnode is 951 * really reclaimed. */ 952 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); 953 } 954 955 /* Notify listeners of tdvp about the change in the directory (either 956 * because a new entry was added or because one was removed). */ 957 VN_KNOTE(tdvp, NOTE_WRITE); 958 959 error = 0; 960 961out_locked: 962 if (fdnode != tdnode) 963 VOP_UNLOCK(fdvp, 0); 964 965out: 966 /* Release target nodes. */ 967 /* XXX: I don't understand when tdvp can be the same as tvp, but 968 * other code takes care of this... */ 969 if (tdvp == tvp) 970 vrele(tdvp); 971 else 972 vput(tdvp); 973 if (tvp != NULL) 974 vput(tvp); 975 976 /* Release source nodes. */ 977 vrele(fdvp); 978 vrele(fvp); 979 980 return error; 981} 982 983/* --------------------------------------------------------------------- */ 984 985int 986tmpfs_mkdir(void *v) 987{ 988 struct vnode *dvp = ((struct vop_mkdir_args *)v)->a_dvp; 989 struct vnode **vpp = ((struct vop_mkdir_args *)v)->a_vpp; 990 struct componentname *cnp = ((struct vop_mkdir_args *)v)->a_cnp; 991 struct vattr *vap = ((struct vop_mkdir_args *)v)->a_vap; 992 993 KASSERT(vap->va_type == VDIR); 994 995 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 996} 997 998/* --------------------------------------------------------------------- */ 999 1000int 1001tmpfs_rmdir(void *v) 1002{ 1003 struct vnode *dvp = ((struct vop_rmdir_args *)v)->a_dvp; 1004 struct vnode *vp = ((struct vop_rmdir_args *)v)->a_vp; 1005 1006 int error; 1007 struct tmpfs_dirent *de; 1008 struct tmpfs_mount *tmp; 1009 struct tmpfs_node *dnode; 1010 struct tmpfs_node *node; 1011 1012 KASSERT(VOP_ISLOCKED(dvp)); 1013 KASSERT(VOP_ISLOCKED(vp)); 1014 1015 tmp = VFS_TO_TMPFS(dvp->v_mount); 1016 dnode = VP_TO_TMPFS_DIR(dvp); 1017 node = VP_TO_TMPFS_DIR(vp); 1018 KASSERT(node->tn_spec.tn_dir.tn_parent == dnode); 1019 1020 /* Get the directory entry associated with node (vp). This was 1021 * filled by tmpfs_lookup while looking up the entry. */ 1022 de = node->tn_lookup_dirent; 1023 KASSERT(TMPFS_DIRENT_MATCHES(de, 1024 ((struct vop_rmdir_args *)v)->a_cnp->cn_nameptr, 1025 ((struct vop_rmdir_args *)v)->a_cnp->cn_namelen)); 1026 1027 /* Directories with more than two entries ('.' and '..') cannot be 1028 * removed. */ 1029 if (node->tn_size > 0) { 1030 error = ENOTEMPTY; 1031 goto out; 1032 } 1033 1034 /* Check flags to see if we are allowed to remove the directory. */ 1035 if (dnode->tn_flags & APPEND || node->tn_flags & (IMMUTABLE | APPEND)) { 1036 error = EPERM; 1037 goto out; 1038 } 1039 1040 /* Detach the directory entry from the directory (dnode). */ 1041 tmpfs_dir_detach(dvp, de); 1042 1043 node->tn_links--; 1044 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1045 TMPFS_NODE_MODIFIED; 1046 node->tn_spec.tn_dir.tn_parent->tn_links--; 1047 node->tn_spec.tn_dir.tn_parent->tn_status |= TMPFS_NODE_ACCESSED | \ 1048 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1049 1050 /* Notify modification of parent directory and release it. */ 1051 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 1052 cache_purge(dvp); /* XXX Is this needed? */ 1053 vput(dvp); 1054 1055 /* Free the directory entry we just deleted. Note that the node 1056 * referred by it will not be removed until the vnode is really 1057 * reclaimed. */ 1058 tmpfs_free_dirent(tmp, de, TRUE); 1059 1060 /* Release the deleted vnode (will destroy the node, notify 1061 * interested parties and clean it from the cache). */ 1062 vput(vp); 1063 1064 error = 0; 1065 1066out: 1067 if (error != 0) { 1068 vput(dvp); 1069 vput(vp); 1070 } 1071 1072 return error; 1073} 1074 1075/* --------------------------------------------------------------------- */ 1076 1077int 1078tmpfs_symlink(void *v) 1079{ 1080 struct vnode *dvp = ((struct vop_symlink_args *)v)->a_dvp; 1081 struct vnode **vpp = ((struct vop_symlink_args *)v)->a_vpp; 1082 struct componentname *cnp = ((struct vop_symlink_args *)v)->a_cnp; 1083 struct vattr *vap = ((struct vop_symlink_args *)v)->a_vap; 1084 char *target = ((struct vop_symlink_args *)v)->a_target; 1085 1086 KASSERT(vap->va_type == VLNK); 1087 1088 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1089} 1090 1091/* --------------------------------------------------------------------- */ 1092 1093int 1094tmpfs_readdir(void *v) 1095{ 1096 struct vnode *vp = ((struct vop_readdir_args *)v)->a_vp; 1097 struct uio *uio = ((struct vop_readdir_args *)v)->a_uio; 1098 int *eofflag = ((struct vop_readdir_args *)v)->a_eofflag; 1099 off_t **cookies = ((struct vop_readdir_args *)v)->a_cookies; 1100 int *ncookies = ((struct vop_readdir_args *)v)->a_ncookies; 1101 1102 int error; 1103 off_t startoff; 1104 off_t cnt; 1105 struct tmpfs_node *node; 1106 1107 KASSERT(VOP_ISLOCKED(vp)); 1108 1109 /* This operation only makes sense on directory nodes. */ 1110 if (vp->v_type != VDIR) { 1111 error = ENOTDIR; 1112 goto out; 1113 } 1114 1115 node = VP_TO_TMPFS_DIR(vp); 1116 1117 startoff = uio->uio_offset; 1118 1119 cnt = 0; 1120 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) { 1121 error = tmpfs_dir_getdotdent(node, uio); 1122 if (error == -1) { 1123 error = 0; 1124 goto outok; 1125 } else if (error != 0) 1126 goto outok; 1127 cnt++; 1128 } 1129 1130 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) { 1131 error = tmpfs_dir_getdotdotdent(node, uio); 1132 if (error == -1) { 1133 error = 0; 1134 goto outok; 1135 } else if (error != 0) 1136 goto outok; 1137 cnt++; 1138 } 1139 1140 error = tmpfs_dir_getdents(node, uio, &cnt); 1141 if (error == -1) 1142 error = 0; 1143 KASSERT(error >= 0); 1144 1145outok: 1146 /* This label assumes that startoff has been 1147 * initialized. If the compiler didn't spit out warnings, we'd 1148 * simply make this one be 'out' and drop 'outok'. */ 1149 1150 if (eofflag != NULL) 1151 *eofflag = 1152 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1153 1154 /* Update NFS-related variables. */ 1155 if (error == 0 && cookies != NULL && ncookies != NULL) { 1156 off_t i; 1157 off_t off = startoff; 1158 struct tmpfs_dirent *de = NULL; 1159 1160 *ncookies = cnt; 1161 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK); 1162 1163 for (i = 0; i < cnt; i++) { 1164 KASSERT(off != TMPFS_DIRCOOKIE_EOF); 1165 if (off == TMPFS_DIRCOOKIE_DOT) { 1166 off = TMPFS_DIRCOOKIE_DOTDOT; 1167 } else { 1168 if (off == TMPFS_DIRCOOKIE_DOTDOT) { 1169 de = TAILQ_FIRST(&node->tn_spec. 1170 tn_dir.tn_dir); 1171 } else if (de != NULL) { 1172 de = TAILQ_NEXT(de, td_entries); 1173 } else { 1174 de = tmpfs_dir_lookupbycookie(node, 1175 off); 1176 KASSERT(de != NULL); 1177 de = TAILQ_NEXT(de, td_entries); 1178 } 1179 if (de == NULL) { 1180 off = TMPFS_DIRCOOKIE_EOF; 1181 } else { 1182 off = tmpfs_dircookie(de); 1183 } 1184 } 1185 1186 (*cookies)[i] = off; 1187 } 1188 KASSERT(uio->uio_offset == off); 1189 } 1190 1191out: 1192 KASSERT(VOP_ISLOCKED(vp)); 1193 1194 return error; 1195} 1196 1197/* --------------------------------------------------------------------- */ 1198 1199int 1200tmpfs_readlink(void *v) 1201{ 1202 struct vnode *vp = ((struct vop_readlink_args *)v)->a_vp; 1203 struct uio *uio = ((struct vop_readlink_args *)v)->a_uio; 1204 1205 int error; 1206 struct tmpfs_node *node; 1207 1208 KASSERT(VOP_ISLOCKED(vp)); 1209 KASSERT(uio->uio_offset == 0); 1210 KASSERT(vp->v_type == VLNK); 1211 1212 node = VP_TO_TMPFS_NODE(vp); 1213 1214 error = uiomove(node->tn_spec.tn_lnk.tn_link, 1215 MIN(node->tn_size, uio->uio_resid), uio); 1216 node->tn_status |= TMPFS_NODE_ACCESSED; 1217 1218 KASSERT(VOP_ISLOCKED(vp)); 1219 1220 return error; 1221} 1222 1223/* --------------------------------------------------------------------- */ 1224 1225int 1226tmpfs_inactive(void *v) 1227{ 1228 struct vnode *vp = ((struct vop_inactive_args *)v)->a_vp; 1229 struct lwp *l = ((struct vop_inactive_args *)v)->a_l; 1230 1231 struct tmpfs_node *node; 1232 1233 KASSERT(VOP_ISLOCKED(vp)); 1234 1235 node = VP_TO_TMPFS_NODE(vp); 1236 1237 VOP_UNLOCK(vp, 0); 1238 1239 if (node->tn_links == 0) 1240 vrecycle(vp, NULL, l); 1241 1242 return 0; 1243} 1244 1245/* --------------------------------------------------------------------- */ 1246 1247int 1248tmpfs_reclaim(void *v) 1249{ 1250 struct vnode *vp = ((struct vop_reclaim_args *)v)->a_vp; 1251 1252 struct tmpfs_mount *tmp; 1253 struct tmpfs_node *node; 1254 1255 KASSERT(!VOP_ISLOCKED(vp)); 1256 1257 node = VP_TO_TMPFS_NODE(vp); 1258 tmp = VFS_TO_TMPFS(vp->v_mount); 1259 1260 if (node->tn_links == 0) 1261 VN_KNOTE(vp, NOTE_DELETE); 1262 1263 cache_purge(vp); 1264 tmpfs_free_vp(vp); 1265 1266 /* If the node referenced by this vnode was deleted by the user, 1267 * we must free its associated data structures (now that the vnode 1268 * is being reclaimed). */ 1269 if (node->tn_links == 0) 1270 tmpfs_free_node(tmp, node); 1271 1272 KASSERT(!VOP_ISLOCKED(vp)); 1273 KASSERT(vp->v_data == NULL); 1274 1275 return 0; 1276} 1277 1278/* --------------------------------------------------------------------- */ 1279 1280int 1281tmpfs_print(void *v) 1282{ 1283 struct vnode *vp = ((struct vop_print_args *)v)->a_vp; 1284 1285 struct tmpfs_node *node; 1286 1287 node = VP_TO_TMPFS_NODE(vp); 1288 1289 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n", 1290 node, node->tn_flags, node->tn_links); 1291 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX 1292 ", status 0x%x\n", 1293 node->tn_mode, node->tn_uid, node->tn_gid, 1294 (uintmax_t)node->tn_size, node->tn_status); 1295 1296 if (vp->v_type == VFIFO) 1297 fifo_printinfo(vp); 1298 lockmgr_printinfo(&vp->v_lock); 1299 1300 printf("\n"); 1301 1302 return 0; 1303} 1304 1305/* --------------------------------------------------------------------- */ 1306 1307int 1308tmpfs_pathconf(void *v) 1309{ 1310 int name = ((struct vop_pathconf_args *)v)->a_name; 1311 register_t *retval = ((struct vop_pathconf_args *)v)->a_retval; 1312 1313 int error; 1314 1315 error = 0; 1316 1317 switch (name) { 1318 case _PC_LINK_MAX: 1319 *retval = LINK_MAX; 1320 break; 1321 1322 case _PC_NAME_MAX: 1323 *retval = NAME_MAX; 1324 break; 1325 1326 case _PC_PATH_MAX: 1327 *retval = PATH_MAX; 1328 break; 1329 1330 case _PC_PIPE_BUF: 1331 *retval = PIPE_BUF; 1332 break; 1333 1334 case _PC_CHOWN_RESTRICTED: 1335 *retval = 1; 1336 break; 1337 1338 case _PC_NO_TRUNC: 1339 *retval = 1; 1340 break; 1341 1342 case _PC_SYNC_IO: 1343 *retval = 1; 1344 break; 1345 1346 case _PC_FILESIZEBITS: 1347 *retval = 0; /* XXX Don't know which value should I return. */ 1348 break; 1349 1350 default: 1351 error = EINVAL; 1352 } 1353 1354 return error; 1355} 1356 1357/* --------------------------------------------------------------------- */ 1358 1359int 1360tmpfs_advlock(void *v) 1361{ 1362 struct vnode *vp = ((struct vop_advlock_args *)v)->a_vp; 1363 1364 struct tmpfs_node *node; 1365 1366 node = VP_TO_TMPFS_NODE(vp); 1367 1368 return lf_advlock(v, &node->tn_lockf, node->tn_size); 1369} 1370 1371/* --------------------------------------------------------------------- */ 1372 1373int 1374tmpfs_getpages(void *v) 1375{ 1376 struct vnode *vp = ((struct vop_getpages_args *)v)->a_vp; 1377 voff_t offset = ((struct vop_getpages_args *)v)->a_offset; 1378 struct vm_page **m = ((struct vop_getpages_args *)v)->a_m; 1379 int *count = ((struct vop_getpages_args *)v)->a_count; 1380 int centeridx = ((struct vop_getpages_args *)v)->a_centeridx; 1381 vm_prot_t access_type = ((struct vop_getpages_args *)v)->a_access_type; 1382 int advice = ((struct vop_getpages_args *)v)->a_advice; 1383 int flags = ((struct vop_getpages_args *)v)->a_flags; 1384 1385 int error; 1386 int i; 1387 struct tmpfs_node *node; 1388 struct uvm_object *uobj; 1389 int npages = *count; 1390 1391 KASSERT(vp->v_type == VREG); 1392 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1393 1394 node = VP_TO_TMPFS_NODE(vp); 1395 uobj = node->tn_spec.tn_reg.tn_aobj; 1396 1397 /* We currently don't rely on PGO_PASTEOF. */ 1398 1399 if (vp->v_size <= offset + (centeridx << PAGE_SHIFT)) { 1400 if ((flags & PGO_LOCKED) == 0) 1401 simple_unlock(&vp->v_interlock); 1402 return EINVAL; 1403 } 1404 1405 if (vp->v_size < offset + (npages << PAGE_SHIFT)) { 1406 npages = (round_page(vp->v_size) - offset) >> PAGE_SHIFT; 1407 } 1408 1409 if ((flags & PGO_LOCKED) != 0) 1410 return EBUSY; 1411 1412 if ((flags & PGO_NOTIMESTAMP) == 0) { 1413 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1414 node->tn_status |= TMPFS_NODE_ACCESSED; 1415 1416 if ((access_type & VM_PROT_WRITE) != 0) 1417 node->tn_status |= TMPFS_NODE_MODIFIED; 1418 } 1419 1420 simple_unlock(&vp->v_interlock); 1421 1422 /* 1423 * Make sure that the array on which we will store the 1424 * gotten pages is clean. Otherwise uao_get (pointed to by 1425 * the pgo_get below) gets confused and does not return the 1426 * appropriate pages. 1427 * 1428 * XXX This shall be revisited when kern/32166 is addressed 1429 * because the loop to clean m[i] will most likely be redundant 1430 * as well as the PGO_ALLPAGES flag. 1431 */ 1432 if (m != NULL) 1433 for (i = 0; i < npages; i++) 1434 m[i] = NULL; 1435 simple_lock(&uobj->vmobjlock); 1436 error = (*uobj->pgops->pgo_get)(uobj, offset, m, &npages, centeridx, 1437 access_type, advice, flags | PGO_ALLPAGES); 1438#if defined(DEBUG) 1439 { 1440 /* Make sure that all the pages we return are valid. */ 1441 int dbgi; 1442 if (error == 0 && m != NULL) 1443 for (dbgi = 0; dbgi < npages; dbgi++) 1444 KASSERT(m[dbgi] != NULL); 1445 } 1446#endif 1447 1448 return error; 1449} 1450 1451/* --------------------------------------------------------------------- */ 1452 1453int 1454tmpfs_putpages(void *v) 1455{ 1456 struct vnode *vp = ((struct vop_putpages_args *)v)->a_vp; 1457 voff_t offlo = ((struct vop_putpages_args *)v)->a_offlo; 1458 voff_t offhi = ((struct vop_putpages_args *)v)->a_offhi; 1459 int flags = ((struct vop_putpages_args *)v)->a_flags; 1460 1461 int error; 1462 struct tmpfs_node *node; 1463 struct uvm_object *uobj; 1464 1465 LOCK_ASSERT(simple_lock_held(&vp->v_interlock)); 1466 1467 node = VP_TO_TMPFS_NODE(vp); 1468 1469 if (vp->v_type != VREG) { 1470 simple_unlock(&vp->v_interlock); 1471 return 0; 1472 } 1473 1474 uobj = node->tn_spec.tn_reg.tn_aobj; 1475 simple_unlock(&vp->v_interlock); 1476 1477 simple_lock(&uobj->vmobjlock); 1478 error = (*uobj->pgops->pgo_put)(uobj, offlo, offhi, flags); 1479 1480 /* XXX mtime */ 1481 1482 return error; 1483} 1484