rumpfs.c revision 1.110.2.2
1 /* $NetBSD: rumpfs.c,v 1.110.2.2 2013/06/23 06:20:28 tls Exp $ */ 2 3 /* 4 * Copyright (c) 2009, 2010, 2011 Antti Kantee. All Rights Reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 16 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: rumpfs.c,v 1.110.2.2 2013/06/23 06:20:28 tls Exp $"); 30 31 #include <sys/param.h> 32 #include <sys/atomic.h> 33 #include <sys/buf.h> 34 #include <sys/dirent.h> 35 #include <sys/errno.h> 36 #include <sys/filedesc.h> 37 #include <sys/fcntl.h> 38 #include <sys/kauth.h> 39 #include <sys/malloc.h> 40 #include <sys/module.h> 41 #include <sys/mount.h> 42 #include <sys/namei.h> 43 #include <sys/lock.h> 44 #include <sys/lockf.h> 45 #include <sys/queue.h> 46 #include <sys/stat.h> 47 #include <sys/syscallargs.h> 48 #include <sys/vnode.h> 49 #include <sys/unistd.h> 50 51 #include <miscfs/fifofs/fifo.h> 52 #include <miscfs/specfs/specdev.h> 53 #include <miscfs/genfs/genfs.h> 54 #include <miscfs/genfs/genfs_node.h> 55 56 #include <uvm/uvm_extern.h> 57 58 #include <rump/rumpuser.h> 59 60 #include "rump_private.h" 61 #include "rump_vfs_private.h" 62 63 static int rump_vop_lookup(void *); 64 static int rump_vop_getattr(void *); 65 static int rump_vop_setattr(void *); 66 static int rump_vop_mkdir(void *); 67 static int rump_vop_rmdir(void *); 68 static int rump_vop_remove(void *); 69 static int rump_vop_mknod(void *); 70 static int rump_vop_create(void *); 71 static int rump_vop_inactive(void *); 72 static int rump_vop_reclaim(void *); 73 static int rump_vop_success(void *); 74 static int rump_vop_readdir(void *); 75 static int rump_vop_spec(void *); 76 static int rump_vop_read(void *); 77 static int rump_vop_write(void *); 78 static int rump_vop_open(void *); 79 static int rump_vop_symlink(void *); 80 static int rump_vop_readlink(void *); 81 static int rump_vop_whiteout(void *); 82 static int rump_vop_pathconf(void *); 83 static int rump_vop_bmap(void *); 84 static int rump_vop_strategy(void *); 85 static int rump_vop_advlock(void *); 86 static int rump_vop_access(void *); 87 88 int (**fifo_vnodeop_p)(void *); 89 const struct vnodeopv_entry_desc fifo_vnodeop_entries[] = { 90 { &vop_default_desc, vn_default_error }, 91 { &vop_putpages_desc, genfs_null_putpages }, 92 { NULL, NULL } 93 }; 94 const struct vnodeopv_desc fifo_vnodeop_opv_desc = 95 { &fifo_vnodeop_p, fifo_vnodeop_entries }; 96 97 int (**rump_vnodeop_p)(void *); 98 const struct vnodeopv_entry_desc rump_vnodeop_entries[] = { 99 { &vop_default_desc, vn_default_error }, 100 { &vop_lookup_desc, rump_vop_lookup }, 101 { &vop_getattr_desc, rump_vop_getattr }, 102 { &vop_setattr_desc, rump_vop_setattr }, 103 { &vop_mkdir_desc, rump_vop_mkdir }, 104 { &vop_rmdir_desc, rump_vop_rmdir }, 105 { &vop_remove_desc, rump_vop_remove }, 106 { &vop_mknod_desc, rump_vop_mknod }, 107 { &vop_create_desc, rump_vop_create }, 108 { &vop_symlink_desc, rump_vop_symlink }, 109 { &vop_readlink_desc, rump_vop_readlink }, 110 { &vop_access_desc, rump_vop_access }, 111 { &vop_readdir_desc, rump_vop_readdir }, 112 { &vop_read_desc, rump_vop_read }, 113 { &vop_write_desc, rump_vop_write }, 114 { &vop_open_desc, rump_vop_open }, 115 { &vop_close_desc, genfs_nullop }, 116 { &vop_seek_desc, genfs_seek }, 117 { &vop_getpages_desc, genfs_getpages }, 118 { &vop_putpages_desc, genfs_putpages }, 119 { &vop_whiteout_desc, rump_vop_whiteout }, 120 { &vop_fsync_desc, rump_vop_success }, 121 { &vop_lock_desc, genfs_lock }, 122 { &vop_unlock_desc, genfs_unlock }, 123 { &vop_islocked_desc, genfs_islocked }, 124 { &vop_inactive_desc, rump_vop_inactive }, 125 { &vop_reclaim_desc, rump_vop_reclaim }, 126 { &vop_link_desc, genfs_eopnotsupp }, 127 { &vop_pathconf_desc, rump_vop_pathconf }, 128 { &vop_bmap_desc, rump_vop_bmap }, 129 { &vop_strategy_desc, rump_vop_strategy }, 130 { &vop_advlock_desc, rump_vop_advlock }, 131 { NULL, NULL } 132 }; 133 const struct vnodeopv_desc rump_vnodeop_opv_desc = 134 { &rump_vnodeop_p, rump_vnodeop_entries }; 135 136 int (**rump_specop_p)(void *); 137 const struct vnodeopv_entry_desc rump_specop_entries[] = { 138 { &vop_default_desc, rump_vop_spec }, 139 { NULL, NULL } 140 }; 141 const struct vnodeopv_desc rump_specop_opv_desc = 142 { &rump_specop_p, rump_specop_entries }; 143 144 const struct vnodeopv_desc * const rump_opv_descs[] = { 145 &rump_vnodeop_opv_desc, 146 &rump_specop_opv_desc, 147 NULL 148 }; 149 150 #define RUMPFS_WHITEOUT ((void *)-1) 151 #define RDENT_ISWHITEOUT(rdp) (rdp->rd_node == RUMPFS_WHITEOUT) 152 struct rumpfs_dent { 153 char *rd_name; 154 int rd_namelen; 155 struct rumpfs_node *rd_node; 156 157 LIST_ENTRY(rumpfs_dent) rd_entries; 158 }; 159 160 struct genfs_ops rumpfs_genfsops = { 161 .gop_size = genfs_size, 162 .gop_write = genfs_gop_write, 163 164 /* optional */ 165 .gop_alloc = NULL, 166 .gop_markupdate = NULL, 167 }; 168 169 struct rumpfs_node { 170 struct genfs_node rn_gn; 171 struct vattr rn_va; 172 struct vnode *rn_vp; 173 char *rn_hostpath; 174 int rn_flags; 175 struct lockf *rn_lockf; 176 177 union { 178 struct { /* VREG */ 179 int readfd; 180 int writefd; 181 uint64_t offset; 182 } reg; 183 struct { 184 void *data; 185 size_t dlen; 186 } reg_noet; 187 struct { /* VDIR */ 188 LIST_HEAD(, rumpfs_dent) dents; 189 struct rumpfs_node *parent; 190 int flags; 191 } dir; 192 struct { 193 char *target; 194 size_t len; 195 } link; 196 } rn_u; 197 }; 198 #define rn_readfd rn_u.reg.readfd 199 #define rn_writefd rn_u.reg.writefd 200 #define rn_offset rn_u.reg.offset 201 #define rn_data rn_u.reg_noet.data 202 #define rn_dlen rn_u.reg_noet.dlen 203 #define rn_dir rn_u.dir.dents 204 #define rn_parent rn_u.dir.parent 205 #define rn_linktarg rn_u.link.target 206 #define rn_linklen rn_u.link.len 207 208 #define RUMPNODE_CANRECLAIM 0x01 209 #define RUMPNODE_DIR_ET 0x02 210 #define RUMPNODE_DIR_ETSUBS 0x04 211 #define RUMPNODE_ET_PHONE_HOST 0x10 212 213 struct rumpfs_mount { 214 struct vnode *rfsmp_rvp; 215 }; 216 217 #define INO_WHITEOUT 1 218 static int lastino = 2; 219 static kmutex_t reclock; 220 221 #define RUMPFS_DEFAULTMODE 0755 222 static void freedir(struct rumpfs_node *, struct componentname *); 223 static struct rumpfs_node *makeprivate(enum vtype, mode_t, dev_t, off_t, bool); 224 225 /* 226 * Extra Terrestrial stuff. We map a given key (pathname) to a file on 227 * the host FS. ET phones home only from the root node of rumpfs. 228 * 229 * When an etfs node is removed, a vnode potentially behind it is not 230 * immediately recycled. 231 */ 232 233 struct etfs { 234 char et_key[MAXPATHLEN]; 235 size_t et_keylen; 236 bool et_prefixkey; 237 bool et_removing; 238 devminor_t et_blkmin; 239 240 LIST_ENTRY(etfs) et_entries; 241 242 struct rumpfs_node *et_rn; 243 }; 244 static kmutex_t etfs_lock; 245 static LIST_HEAD(, etfs) etfs_list = LIST_HEAD_INITIALIZER(etfs_list); 246 247 static enum vtype 248 ettype_to_vtype(enum rump_etfs_type et) 249 { 250 enum vtype vt; 251 252 switch (et) { 253 case RUMP_ETFS_REG: 254 vt = VREG; 255 break; 256 case RUMP_ETFS_BLK: 257 vt = VBLK; 258 break; 259 case RUMP_ETFS_CHR: 260 vt = VCHR; 261 break; 262 case RUMP_ETFS_DIR: 263 vt = VDIR; 264 break; 265 case RUMP_ETFS_DIR_SUBDIRS: 266 vt = VDIR; 267 break; 268 default: 269 panic("invalid et type: %d", et); 270 } 271 272 return vt; 273 } 274 275 static enum vtype 276 hft_to_vtype(int hft) 277 { 278 enum vtype vt; 279 280 switch (hft) { 281 case RUMPUSER_FT_OTHER: 282 vt = VNON; 283 break; 284 case RUMPUSER_FT_DIR: 285 vt = VDIR; 286 break; 287 case RUMPUSER_FT_REG: 288 vt = VREG; 289 break; 290 case RUMPUSER_FT_BLK: 291 vt = VBLK; 292 break; 293 case RUMPUSER_FT_CHR: 294 vt = VCHR; 295 break; 296 default: 297 vt = VNON; 298 break; 299 } 300 301 return vt; 302 } 303 304 static bool 305 etfs_find(const char *key, struct etfs **etp, bool forceprefix) 306 { 307 struct etfs *et; 308 size_t keylen = strlen(key); 309 310 KASSERT(mutex_owned(&etfs_lock)); 311 312 LIST_FOREACH(et, &etfs_list, et_entries) { 313 if ((keylen == et->et_keylen || et->et_prefixkey || forceprefix) 314 && strncmp(key, et->et_key, et->et_keylen) == 0) { 315 if (etp) 316 *etp = et; 317 return true; 318 } 319 } 320 321 return false; 322 } 323 324 #define REGDIR(ftype) \ 325 ((ftype) == RUMP_ETFS_DIR || (ftype) == RUMP_ETFS_DIR_SUBDIRS) 326 static int 327 doregister(const char *key, const char *hostpath, 328 enum rump_etfs_type ftype, uint64_t begin, uint64_t size) 329 { 330 char buf[9]; 331 struct etfs *et; 332 struct rumpfs_node *rn; 333 uint64_t fsize; 334 dev_t rdev = NODEV; 335 devminor_t dmin = -1; 336 int hft, error; 337 338 if (key[0] != '/') { 339 return EINVAL; 340 } 341 while (key[0] == '/') { 342 key++; 343 } 344 345 if ((error = rumpuser_getfileinfo(hostpath, &fsize, &hft)) != 0) 346 return error; 347 348 /* etfs directory requires a directory on the host */ 349 if (REGDIR(ftype)) { 350 if (hft != RUMPUSER_FT_DIR) 351 return ENOTDIR; 352 if (begin != 0) 353 return EISDIR; 354 if (size != RUMP_ETFS_SIZE_ENDOFF) 355 return EISDIR; 356 size = fsize; 357 } else { 358 if (begin > fsize) 359 return EINVAL; 360 if (size == RUMP_ETFS_SIZE_ENDOFF) 361 size = fsize - begin; 362 if (begin + size > fsize) 363 return EINVAL; 364 } 365 366 if (ftype == RUMP_ETFS_BLK || ftype == RUMP_ETFS_CHR) { 367 error = rumpblk_register(hostpath, &dmin, begin, size); 368 if (error != 0) { 369 return error; 370 } 371 rdev = makedev(RUMPBLK_DEVMAJOR, dmin); 372 } 373 374 et = kmem_alloc(sizeof(*et), KM_SLEEP); 375 strcpy(et->et_key, key); 376 et->et_keylen = strlen(et->et_key); 377 et->et_rn = rn = makeprivate(ettype_to_vtype(ftype), RUMPFS_DEFAULTMODE, 378 rdev, size, true); 379 et->et_removing = false; 380 et->et_blkmin = dmin; 381 382 rn->rn_flags |= RUMPNODE_ET_PHONE_HOST; 383 384 if (ftype == RUMP_ETFS_REG || REGDIR(ftype) || et->et_blkmin != -1) { 385 size_t len = strlen(hostpath)+1; 386 387 rn->rn_hostpath = malloc(len, M_TEMP, M_WAITOK | M_ZERO); 388 memcpy(rn->rn_hostpath, hostpath, len); 389 rn->rn_offset = begin; 390 } 391 392 if (REGDIR(ftype)) { 393 rn->rn_flags |= RUMPNODE_DIR_ET; 394 et->et_prefixkey = true; 395 } else { 396 et->et_prefixkey = false; 397 } 398 399 if (ftype == RUMP_ETFS_DIR_SUBDIRS) 400 rn->rn_flags |= RUMPNODE_DIR_ETSUBS; 401 402 mutex_enter(&etfs_lock); 403 if (etfs_find(key, NULL, REGDIR(ftype))) { 404 mutex_exit(&etfs_lock); 405 if (et->et_blkmin != -1) 406 rumpblk_deregister(hostpath); 407 if (et->et_rn->rn_hostpath != NULL) 408 free(et->et_rn->rn_hostpath, M_TEMP); 409 kmem_free(et->et_rn, sizeof(*et->et_rn)); 410 kmem_free(et, sizeof(*et)); 411 return EEXIST; 412 } 413 LIST_INSERT_HEAD(&etfs_list, et, et_entries); 414 mutex_exit(&etfs_lock); 415 416 if (ftype == RUMP_ETFS_BLK) { 417 format_bytes(buf, sizeof(buf), size); 418 aprint_verbose("/%s: hostpath %s (%s)\n", key, hostpath, buf); 419 } 420 421 return 0; 422 } 423 #undef REGDIR 424 425 int 426 rump_etfs_register(const char *key, const char *hostpath, 427 enum rump_etfs_type ftype) 428 { 429 430 return doregister(key, hostpath, ftype, 0, RUMP_ETFS_SIZE_ENDOFF); 431 } 432 433 int 434 rump_etfs_register_withsize(const char *key, const char *hostpath, 435 enum rump_etfs_type ftype, uint64_t begin, uint64_t size) 436 { 437 438 return doregister(key, hostpath, ftype, begin, size); 439 } 440 441 /* remove etfs mapping. caller's responsibility to make sure it's not in use */ 442 int 443 rump_etfs_remove(const char *key) 444 { 445 struct etfs *et; 446 size_t keylen; 447 int rv; 448 449 if (key[0] != '/') { 450 return EINVAL; 451 } 452 while (key[0] == '/') { 453 key++; 454 } 455 456 keylen = strlen(key); 457 458 mutex_enter(&etfs_lock); 459 LIST_FOREACH(et, &etfs_list, et_entries) { 460 if (keylen == et->et_keylen && strcmp(et->et_key, key) == 0) { 461 if (et->et_removing) 462 et = NULL; 463 else 464 et->et_removing = true; 465 break; 466 } 467 } 468 mutex_exit(&etfs_lock); 469 if (!et) 470 return ENOENT; 471 472 /* 473 * ok, we know what we want to remove and have signalled there 474 * actually are men at work. first, unregister from rumpblk 475 */ 476 if (et->et_blkmin != -1) { 477 rv = rumpblk_deregister(et->et_rn->rn_hostpath); 478 } else { 479 rv = 0; 480 } 481 KASSERT(rv == 0); 482 483 /* then do the actual removal */ 484 mutex_enter(&etfs_lock); 485 LIST_REMOVE(et, et_entries); 486 mutex_exit(&etfs_lock); 487 488 /* node is unreachable, safe to nuke all device copies */ 489 if (et->et_blkmin != -1) { 490 vdevgone(RUMPBLK_DEVMAJOR, et->et_blkmin, et->et_blkmin, VBLK); 491 } else { 492 struct vnode *vp; 493 494 mutex_enter(&reclock); 495 if ((vp = et->et_rn->rn_vp) != NULL) 496 mutex_enter(vp->v_interlock); 497 mutex_exit(&reclock); 498 if (vp && vget(vp, 0) == 0) 499 vgone(vp); 500 } 501 502 if (et->et_rn->rn_hostpath != NULL) 503 free(et->et_rn->rn_hostpath, M_TEMP); 504 kmem_free(et->et_rn, sizeof(*et->et_rn)); 505 kmem_free(et, sizeof(*et)); 506 507 return 0; 508 } 509 510 /* 511 * rumpfs 512 */ 513 514 static struct rumpfs_node * 515 makeprivate(enum vtype vt, mode_t mode, dev_t rdev, off_t size, bool et) 516 { 517 struct rumpfs_node *rn; 518 struct vattr *va; 519 struct timespec ts; 520 521 KASSERT((mode & ~ALLPERMS) == 0); 522 rn = kmem_zalloc(sizeof(*rn), KM_SLEEP); 523 524 switch (vt) { 525 case VDIR: 526 LIST_INIT(&rn->rn_dir); 527 break; 528 case VREG: 529 if (et) { 530 rn->rn_readfd = -1; 531 rn->rn_writefd = -1; 532 } 533 break; 534 default: 535 break; 536 } 537 538 nanotime(&ts); 539 540 va = &rn->rn_va; 541 va->va_type = vt; 542 va->va_mode = mode; 543 if (vt == VDIR) 544 va->va_nlink = 2; 545 else 546 va->va_nlink = 1; 547 va->va_uid = 0; 548 va->va_gid = 0; 549 va->va_fsid = 550 va->va_fileid = atomic_inc_uint_nv(&lastino); 551 va->va_size = size; 552 va->va_blocksize = 512; 553 va->va_atime = ts; 554 va->va_mtime = ts; 555 va->va_ctime = ts; 556 va->va_birthtime = ts; 557 va->va_gen = 0; 558 va->va_flags = 0; 559 va->va_rdev = rdev; 560 va->va_bytes = 512; 561 va->va_filerev = 0; 562 va->va_vaflags = 0; 563 564 return rn; 565 } 566 567 static int 568 makevnode(struct mount *mp, struct rumpfs_node *rn, struct vnode **vpp) 569 { 570 struct vnode *vp; 571 int (**vpops)(void *); 572 struct vattr *va = &rn->rn_va; 573 int rv; 574 575 KASSERT(!mutex_owned(&reclock)); 576 577 if (va->va_type == VCHR || va->va_type == VBLK) { 578 vpops = rump_specop_p; 579 } else { 580 vpops = rump_vnodeop_p; 581 } 582 583 rv = getnewvnode(VT_RUMP, mp, vpops, NULL, &vp); 584 if (rv) 585 return rv; 586 587 vp->v_size = vp->v_writesize = va->va_size; 588 vp->v_type = va->va_type; 589 590 if (vpops == rump_specop_p) { 591 spec_node_init(vp, va->va_rdev); 592 } 593 vp->v_data = rn; 594 595 genfs_node_init(vp, &rumpfs_genfsops); 596 vn_lock(vp, LK_RETRY | LK_EXCLUSIVE); 597 mutex_enter(&reclock); 598 rn->rn_vp = vp; 599 mutex_exit(&reclock); 600 601 *vpp = vp; 602 603 return 0; 604 } 605 606 607 static void 608 makedir(struct rumpfs_node *rnd, 609 struct componentname *cnp, struct rumpfs_node *rn) 610 { 611 struct rumpfs_dent *rdent; 612 613 rdent = kmem_alloc(sizeof(*rdent), KM_SLEEP); 614 rdent->rd_name = kmem_alloc(cnp->cn_namelen+1, KM_SLEEP); 615 rdent->rd_node = rn; 616 strlcpy(rdent->rd_name, cnp->cn_nameptr, cnp->cn_namelen+1); 617 rdent->rd_namelen = strlen(rdent->rd_name); 618 619 if ((cnp->cn_flags & ISWHITEOUT) != 0) { 620 KASSERT((cnp->cn_flags & DOWHITEOUT) == 0); 621 freedir(rnd, cnp); 622 } 623 LIST_INSERT_HEAD(&rnd->rn_dir, rdent, rd_entries); 624 } 625 626 static void 627 freedir(struct rumpfs_node *rnd, struct componentname *cnp) 628 { 629 struct rumpfs_dent *rd = NULL; 630 631 LIST_FOREACH(rd, &rnd->rn_dir, rd_entries) { 632 if (rd->rd_namelen == cnp->cn_namelen && 633 strncmp(rd->rd_name, cnp->cn_nameptr, 634 cnp->cn_namelen) == 0) 635 break; 636 } 637 if (rd == NULL) 638 panic("could not find directory entry: %s", cnp->cn_nameptr); 639 640 if (cnp->cn_flags & DOWHITEOUT) { 641 rd->rd_node = RUMPFS_WHITEOUT; 642 } else { 643 LIST_REMOVE(rd, rd_entries); 644 kmem_free(rd->rd_name, rd->rd_namelen+1); 645 kmem_free(rd, sizeof(*rd)); 646 } 647 } 648 649 /* 650 * Simple lookup for rump file systems. 651 * 652 * uhm, this is twisted. C F C C, hope of C C F C looming 653 */ 654 static int 655 rump_vop_lookup(void *v) 656 { 657 struct vop_lookup_args /* { 658 struct vnode *a_dvp; 659 struct vnode **a_vpp; 660 struct componentname *a_cnp; 661 }; */ *ap = v; 662 struct componentname *cnp = ap->a_cnp; 663 struct vnode *dvp = ap->a_dvp; 664 struct vnode **vpp = ap->a_vpp; 665 struct vnode *vp; 666 struct rumpfs_node *rnd = dvp->v_data, *rn; 667 struct rumpfs_dent *rd = NULL; 668 struct etfs *et; 669 bool dotdot = (cnp->cn_flags & ISDOTDOT) != 0; 670 int rv = 0; 671 const char *cp; 672 673 *vpp = NULL; 674 675 rv = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 676 if (rv) 677 return rv; 678 679 if ((cnp->cn_flags & ISLASTCN) 680 && (dvp->v_mount->mnt_flag & MNT_RDONLY) 681 && (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 682 return EROFS; 683 684 /* check for dot, return directly if the case */ 685 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 686 vref(dvp); 687 *vpp = dvp; 688 return 0; 689 } 690 691 /* we don't do rename */ 692 if (!(((cnp->cn_flags & ISLASTCN) == 0) || (cnp->cn_nameiop != RENAME))) 693 return EOPNOTSUPP; 694 695 /* check for etfs */ 696 if (dvp == rootvnode && 697 (cnp->cn_nameiop == LOOKUP || cnp->cn_nameiop == CREATE)) { 698 bool found; 699 mutex_enter(&etfs_lock); 700 found = etfs_find(cnp->cn_nameptr, &et, false); 701 mutex_exit(&etfs_lock); 702 703 if (found) { 704 rn = et->et_rn; 705 cnp->cn_consume += et->et_keylen - cnp->cn_namelen; 706 /* 707 * consume trailing slashes if any and clear 708 * REQUIREDIR if we consumed the full path. 709 */ 710 cp = &cnp->cn_nameptr[cnp->cn_namelen]; 711 cp += cnp->cn_consume; 712 KASSERT(*cp == '\0' || *cp == '/'); 713 if (*cp == '\0' && rn->rn_va.va_type != VDIR) 714 cnp->cn_flags &= ~REQUIREDIR; 715 while (*cp++ == '/') 716 cnp->cn_consume++; 717 goto getvnode; 718 } 719 } 720 721 if (rnd->rn_flags & RUMPNODE_DIR_ET) { 722 uint64_t fsize; 723 char *newpath; 724 size_t newpathlen; 725 int hft, error; 726 727 if (dotdot) 728 return EOPNOTSUPP; 729 730 newpathlen = strlen(rnd->rn_hostpath) + 1 + cnp->cn_namelen + 1; 731 newpath = malloc(newpathlen, M_TEMP, M_WAITOK); 732 733 strlcpy(newpath, rnd->rn_hostpath, newpathlen); 734 strlcat(newpath, "/", newpathlen); 735 strlcat(newpath, cnp->cn_nameptr, newpathlen); 736 737 if ((error = rumpuser_getfileinfo(newpath, &fsize, &hft)) != 0){ 738 free(newpath, M_TEMP); 739 return error; 740 } 741 742 /* allow only dirs and regular files */ 743 if (hft != RUMPUSER_FT_REG && hft != RUMPUSER_FT_DIR) { 744 free(newpath, M_TEMP); 745 return ENOENT; 746 } 747 748 rn = makeprivate(hft_to_vtype(hft), RUMPFS_DEFAULTMODE, 749 NODEV, fsize, true); 750 rn->rn_flags |= RUMPNODE_CANRECLAIM; 751 if (rnd->rn_flags & RUMPNODE_DIR_ETSUBS) { 752 rn->rn_flags |= RUMPNODE_DIR_ET | RUMPNODE_DIR_ETSUBS; 753 rn->rn_flags |= RUMPNODE_ET_PHONE_HOST; 754 } 755 rn->rn_hostpath = newpath; 756 757 goto getvnode; 758 } else { 759 if (dotdot) { 760 if ((rn = rnd->rn_parent) != NULL) 761 goto getvnode; 762 } else { 763 LIST_FOREACH(rd, &rnd->rn_dir, rd_entries) { 764 if (rd->rd_namelen == cnp->cn_namelen && 765 strncmp(rd->rd_name, cnp->cn_nameptr, 766 cnp->cn_namelen) == 0) 767 break; 768 } 769 } 770 } 771 772 if (!rd && ((cnp->cn_flags & ISLASTCN) == 0||cnp->cn_nameiop != CREATE)) 773 return ENOENT; 774 775 if (!rd && (cnp->cn_flags & ISLASTCN) && cnp->cn_nameiop == CREATE) { 776 if (dvp->v_mount->mnt_flag & MNT_RDONLY) 777 return EROFS; 778 rv = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 779 if (rv) 780 return rv; 781 return EJUSTRETURN; 782 } 783 784 if ((cnp->cn_flags & ISLASTCN) && cnp->cn_nameiop == DELETE) { 785 rv = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 786 if (rv) 787 return rv; 788 } 789 790 if (RDENT_ISWHITEOUT(rd)) { 791 cnp->cn_flags |= ISWHITEOUT; 792 if ((cnp->cn_flags & ISLASTCN) && cnp->cn_nameiop == CREATE) 793 return EJUSTRETURN; 794 return ENOENT; 795 } 796 797 rn = rd->rd_node; 798 799 getvnode: 800 KASSERT(rn); 801 if (dotdot) 802 VOP_UNLOCK(dvp); 803 mutex_enter(&reclock); 804 if ((vp = rn->rn_vp)) { 805 mutex_enter(vp->v_interlock); 806 mutex_exit(&reclock); 807 if (vget(vp, LK_EXCLUSIVE)) { 808 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 809 goto getvnode; 810 } 811 *vpp = vp; 812 } else { 813 mutex_exit(&reclock); 814 rv = makevnode(dvp->v_mount, rn, vpp); 815 } 816 if (dotdot) 817 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 818 819 return rv; 820 } 821 822 static int 823 rump_check_possible(struct vnode *vp, struct rumpfs_node *rnode, 824 mode_t mode) 825 { 826 827 if ((mode & VWRITE) == 0) 828 return 0; 829 830 switch (vp->v_type) { 831 case VDIR: 832 case VLNK: 833 case VREG: 834 break; 835 default: 836 /* special file is always writable. */ 837 return 0; 838 } 839 840 return vp->v_mount->mnt_flag & MNT_RDONLY ? EROFS : 0; 841 } 842 843 static int 844 rump_check_permitted(struct vnode *vp, struct rumpfs_node *rnode, 845 mode_t mode, kauth_cred_t cred) 846 { 847 struct vattr *attr = &rnode->rn_va; 848 849 return kauth_authorize_vnode(cred, KAUTH_ACCESS_ACTION(mode, 850 vp->v_type, attr->va_mode), vp, NULL, genfs_can_access(vp->v_type, 851 attr->va_mode, attr->va_uid, attr->va_gid, mode, cred)); 852 } 853 854 int 855 rump_vop_access(void *v) 856 { 857 struct vop_access_args /* { 858 const struct vnodeop_desc *a_desc; 859 struct vnode *a_vp; 860 int a_mode; 861 kauth_cred_t a_cred; 862 } */ *ap = v; 863 struct vnode *vp = ap->a_vp; 864 struct rumpfs_node *rn = vp->v_data; 865 int error; 866 867 error = rump_check_possible(vp, rn, ap->a_mode); 868 if (error) 869 return error; 870 871 error = rump_check_permitted(vp, rn, ap->a_mode, ap->a_cred); 872 873 return error; 874 } 875 876 static int 877 rump_vop_getattr(void *v) 878 { 879 struct vop_getattr_args /* { 880 struct vnode *a_vp; 881 struct vattr *a_vap; 882 kauth_cred_t a_cred; 883 } */ *ap = v; 884 struct vnode *vp = ap->a_vp; 885 struct rumpfs_node *rn = vp->v_data; 886 struct vattr *vap = ap->a_vap; 887 888 memcpy(vap, &rn->rn_va, sizeof(struct vattr)); 889 vap->va_size = vp->v_size; 890 return 0; 891 } 892 893 static int 894 rump_vop_setattr(void *v) 895 { 896 struct vop_setattr_args /* { 897 struct vnode *a_vp; 898 struct vattr *a_vap; 899 kauth_cred_t a_cred; 900 } */ *ap = v; 901 struct vnode *vp = ap->a_vp; 902 struct vattr *vap = ap->a_vap; 903 struct rumpfs_node *rn = vp->v_data; 904 struct vattr *attr = &rn->rn_va; 905 kauth_cred_t cred = ap->a_cred; 906 int error; 907 908 #define CHANGED(a, t) (vap->a != (t)VNOVAL) 909 #define SETIFVAL(a,t) if (CHANGED(a, t)) rn->rn_va.a = vap->a 910 if (CHANGED(va_atime.tv_sec, time_t) || 911 CHANGED(va_ctime.tv_sec, time_t) || 912 CHANGED(va_mtime.tv_sec, time_t) || 913 CHANGED(va_birthtime.tv_sec, time_t) || 914 CHANGED(va_atime.tv_nsec, long) || 915 CHANGED(va_ctime.tv_nsec, long) || 916 CHANGED(va_mtime.tv_nsec, long) || 917 CHANGED(va_birthtime.tv_nsec, long)) { 918 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_TIMES, vp, 919 NULL, genfs_can_chtimes(vp, vap->va_vaflags, attr->va_uid, 920 cred)); 921 if (error) 922 return error; 923 } 924 925 SETIFVAL(va_atime.tv_sec, time_t); 926 SETIFVAL(va_ctime.tv_sec, time_t); 927 SETIFVAL(va_mtime.tv_sec, time_t); 928 SETIFVAL(va_birthtime.tv_sec, time_t); 929 SETIFVAL(va_atime.tv_nsec, long); 930 SETIFVAL(va_ctime.tv_nsec, long); 931 SETIFVAL(va_mtime.tv_nsec, long); 932 SETIFVAL(va_birthtime.tv_nsec, long); 933 934 if (CHANGED(va_flags, u_long)) { 935 /* XXX Can we handle system flags here...? */ 936 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_FLAGS, vp, 937 NULL, genfs_can_chflags(cred, vp->v_type, attr->va_uid, 938 false)); 939 if (error) 940 return error; 941 } 942 943 SETIFVAL(va_flags, u_long); 944 #undef SETIFVAL 945 #undef CHANGED 946 947 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (uid_t)VNOVAL) { 948 uid_t uid = 949 (vap->va_uid != (uid_t)VNOVAL) ? vap->va_uid : attr->va_uid; 950 gid_t gid = 951 (vap->va_gid != (gid_t)VNOVAL) ? vap->va_gid : attr->va_gid; 952 error = kauth_authorize_vnode(cred, 953 KAUTH_VNODE_CHANGE_OWNERSHIP, vp, NULL, 954 genfs_can_chown(cred, attr->va_uid, attr->va_gid, uid, 955 gid)); 956 if (error) 957 return error; 958 attr->va_uid = uid; 959 attr->va_gid = gid; 960 } 961 962 if (vap->va_mode != (mode_t)VNOVAL) { 963 mode_t mode = vap->va_mode; 964 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_SECURITY, 965 vp, NULL, genfs_can_chmod(vp->v_type, cred, attr->va_uid, 966 attr->va_gid, mode)); 967 if (error) 968 return error; 969 attr->va_mode = mode; 970 } 971 972 if (vp->v_type == VREG && 973 vap->va_size != VSIZENOTSET && 974 vap->va_size != rn->rn_dlen) { 975 void *newdata; 976 size_t copylen, newlen; 977 978 newlen = vap->va_size; 979 newdata = rump_hypermalloc(newlen, 0, true, "rumpfs"); 980 981 copylen = MIN(rn->rn_dlen, newlen); 982 memset(newdata, 0, newlen); 983 memcpy(newdata, rn->rn_data, copylen); 984 rump_hyperfree(rn->rn_data, rn->rn_dlen); 985 986 rn->rn_data = newdata; 987 rn->rn_dlen = newlen; 988 uvm_vnp_setsize(vp, newlen); 989 } 990 return 0; 991 } 992 993 static int 994 rump_vop_mkdir(void *v) 995 { 996 struct vop_mkdir_args /* { 997 struct vnode *a_dvp; 998 struct vnode **a_vpp; 999 struct componentname *a_cnp; 1000 struct vattr *a_vap; 1001 }; */ *ap = v; 1002 struct vnode *dvp = ap->a_dvp; 1003 struct vnode **vpp = ap->a_vpp; 1004 struct componentname *cnp = ap->a_cnp; 1005 struct vattr *va = ap->a_vap; 1006 struct rumpfs_node *rnd = dvp->v_data, *rn; 1007 int rv = 0; 1008 1009 rn = makeprivate(VDIR, va->va_mode & ALLPERMS, NODEV, DEV_BSIZE, false); 1010 if ((cnp->cn_flags & ISWHITEOUT) != 0) 1011 rn->rn_va.va_flags |= UF_OPAQUE; 1012 rn->rn_parent = rnd; 1013 rv = makevnode(dvp->v_mount, rn, vpp); 1014 if (rv) 1015 goto out; 1016 1017 makedir(rnd, cnp, rn); 1018 1019 out: 1020 vput(dvp); 1021 return rv; 1022 } 1023 1024 static int 1025 rump_vop_rmdir(void *v) 1026 { 1027 struct vop_rmdir_args /* { 1028 struct vnode *a_dvp; 1029 struct vnode *a_vp; 1030 struct componentname *a_cnp; 1031 }; */ *ap = v; 1032 struct vnode *dvp = ap->a_dvp; 1033 struct vnode *vp = ap->a_vp; 1034 struct componentname *cnp = ap->a_cnp; 1035 struct rumpfs_node *rnd = dvp->v_data; 1036 struct rumpfs_node *rn = vp->v_data; 1037 struct rumpfs_dent *rd; 1038 int rv = 0; 1039 1040 LIST_FOREACH(rd, &rn->rn_dir, rd_entries) { 1041 if (rd->rd_node != RUMPFS_WHITEOUT) { 1042 rv = ENOTEMPTY; 1043 goto out; 1044 } 1045 } 1046 while ((rd = LIST_FIRST(&rn->rn_dir)) != NULL) { 1047 KASSERT(rd->rd_node == RUMPFS_WHITEOUT); 1048 LIST_REMOVE(rd, rd_entries); 1049 kmem_free(rd->rd_name, rd->rd_namelen+1); 1050 kmem_free(rd, sizeof(*rd)); 1051 } 1052 1053 freedir(rnd, cnp); 1054 rn->rn_flags |= RUMPNODE_CANRECLAIM; 1055 rn->rn_parent = NULL; 1056 1057 out: 1058 vput(dvp); 1059 vput(vp); 1060 1061 return rv; 1062 } 1063 1064 static int 1065 rump_vop_remove(void *v) 1066 { 1067 struct vop_remove_args /* { 1068 struct vnode *a_dvp; 1069 struct vnode *a_vp; 1070 struct componentname *a_cnp; 1071 }; */ *ap = v; 1072 struct vnode *dvp = ap->a_dvp; 1073 struct vnode *vp = ap->a_vp; 1074 struct componentname *cnp = ap->a_cnp; 1075 struct rumpfs_node *rnd = dvp->v_data; 1076 struct rumpfs_node *rn = vp->v_data; 1077 int rv = 0; 1078 1079 if (rn->rn_flags & RUMPNODE_ET_PHONE_HOST) 1080 return EOPNOTSUPP; 1081 1082 if (vp->v_type == VREG) { 1083 rump_hyperfree(rn->rn_data, rn->rn_dlen); 1084 } 1085 1086 freedir(rnd, cnp); 1087 rn->rn_flags |= RUMPNODE_CANRECLAIM; 1088 1089 vput(dvp); 1090 vput(vp); 1091 1092 return rv; 1093 } 1094 1095 static int 1096 rump_vop_mknod(void *v) 1097 { 1098 struct vop_mknod_args /* { 1099 struct vnode *a_dvp; 1100 struct vnode **a_vpp; 1101 struct componentname *a_cnp; 1102 struct vattr *a_vap; 1103 }; */ *ap = v; 1104 struct vnode *dvp = ap->a_dvp; 1105 struct vnode **vpp = ap->a_vpp; 1106 struct componentname *cnp = ap->a_cnp; 1107 struct vattr *va = ap->a_vap; 1108 struct rumpfs_node *rnd = dvp->v_data, *rn; 1109 int rv; 1110 1111 rn = makeprivate(va->va_type, va->va_mode & ALLPERMS, va->va_rdev, 1112 DEV_BSIZE, false); 1113 if ((cnp->cn_flags & ISWHITEOUT) != 0) 1114 rn->rn_va.va_flags |= UF_OPAQUE; 1115 rv = makevnode(dvp->v_mount, rn, vpp); 1116 if (rv) 1117 goto out; 1118 1119 makedir(rnd, cnp, rn); 1120 1121 out: 1122 vput(dvp); 1123 return rv; 1124 } 1125 1126 static int 1127 rump_vop_create(void *v) 1128 { 1129 struct vop_create_args /* { 1130 struct vnode *a_dvp; 1131 struct vnode **a_vpp; 1132 struct componentname *a_cnp; 1133 struct vattr *a_vap; 1134 }; */ *ap = v; 1135 struct vnode *dvp = ap->a_dvp; 1136 struct vnode **vpp = ap->a_vpp; 1137 struct componentname *cnp = ap->a_cnp; 1138 struct vattr *va = ap->a_vap; 1139 struct rumpfs_node *rnd = dvp->v_data, *rn; 1140 off_t newsize; 1141 int rv; 1142 1143 newsize = va->va_type == VSOCK ? DEV_BSIZE : 0; 1144 rn = makeprivate(va->va_type, va->va_mode & ALLPERMS, NODEV, 1145 newsize, false); 1146 if ((cnp->cn_flags & ISWHITEOUT) != 0) 1147 rn->rn_va.va_flags |= UF_OPAQUE; 1148 rv = makevnode(dvp->v_mount, rn, vpp); 1149 if (rv) 1150 goto out; 1151 1152 makedir(rnd, cnp, rn); 1153 1154 out: 1155 vput(dvp); 1156 return rv; 1157 } 1158 1159 static int 1160 rump_vop_symlink(void *v) 1161 { 1162 struct vop_symlink_args /* { 1163 struct vnode *a_dvp; 1164 struct vnode **a_vpp; 1165 struct componentname *a_cnp; 1166 struct vattr *a_vap; 1167 char *a_target; 1168 }; */ *ap = v; 1169 struct vnode *dvp = ap->a_dvp; 1170 struct vnode **vpp = ap->a_vpp; 1171 struct componentname *cnp = ap->a_cnp; 1172 struct vattr *va = ap->a_vap; 1173 struct rumpfs_node *rnd = dvp->v_data, *rn; 1174 const char *target = ap->a_target; 1175 size_t linklen; 1176 int rv; 1177 1178 linklen = strlen(target); 1179 KASSERT(linklen < MAXPATHLEN); 1180 rn = makeprivate(VLNK, va->va_mode & ALLPERMS, NODEV, linklen, false); 1181 if ((cnp->cn_flags & ISWHITEOUT) != 0) 1182 rn->rn_va.va_flags |= UF_OPAQUE; 1183 rv = makevnode(dvp->v_mount, rn, vpp); 1184 if (rv) 1185 goto out; 1186 1187 makedir(rnd, cnp, rn); 1188 1189 KASSERT(linklen < MAXPATHLEN); 1190 rn->rn_linktarg = PNBUF_GET(); 1191 rn->rn_linklen = linklen; 1192 strcpy(rn->rn_linktarg, target); 1193 1194 out: 1195 vput(dvp); 1196 return rv; 1197 } 1198 1199 static int 1200 rump_vop_readlink(void *v) 1201 { 1202 struct vop_readlink_args /* { 1203 struct vnode *a_vp; 1204 struct uio *a_uio; 1205 kauth_cred_t a_cred; 1206 }; */ *ap = v; 1207 struct vnode *vp = ap->a_vp; 1208 struct rumpfs_node *rn = vp->v_data; 1209 struct uio *uio = ap->a_uio; 1210 1211 return uiomove(rn->rn_linktarg, rn->rn_linklen, uio); 1212 } 1213 1214 static int 1215 rump_vop_whiteout(void *v) 1216 { 1217 struct vop_whiteout_args /* { 1218 struct vnode *a_dvp; 1219 struct componentname *a_cnp; 1220 int a_flags; 1221 } */ *ap = v; 1222 struct vnode *dvp = ap->a_dvp; 1223 struct rumpfs_node *rnd = dvp->v_data; 1224 struct componentname *cnp = ap->a_cnp; 1225 int flags = ap->a_flags; 1226 1227 switch (flags) { 1228 case LOOKUP: 1229 break; 1230 case CREATE: 1231 makedir(rnd, cnp, RUMPFS_WHITEOUT); 1232 break; 1233 case DELETE: 1234 cnp->cn_flags &= ~DOWHITEOUT; /* cargo culting never fails ? */ 1235 freedir(rnd, cnp); 1236 break; 1237 default: 1238 panic("unknown whiteout op %d", flags); 1239 } 1240 1241 return 0; 1242 } 1243 1244 static int 1245 rump_vop_open(void *v) 1246 { 1247 struct vop_open_args /* { 1248 struct vnode *a_vp; 1249 int a_mode; 1250 kauth_cred_t a_cred; 1251 } */ *ap = v; 1252 struct vnode *vp = ap->a_vp; 1253 struct rumpfs_node *rn = vp->v_data; 1254 int mode = ap->a_mode; 1255 int error = EINVAL; 1256 1257 if (vp->v_type != VREG || (rn->rn_flags & RUMPNODE_ET_PHONE_HOST) == 0) 1258 return 0; 1259 1260 if (mode & FREAD) { 1261 if (rn->rn_readfd != -1) 1262 return 0; 1263 error = rumpuser_open(rn->rn_hostpath, 1264 RUMPUSER_OPEN_RDONLY, &rn->rn_readfd); 1265 } 1266 1267 if (mode & FWRITE) { 1268 if (rn->rn_writefd != -1) 1269 return 0; 1270 error = rumpuser_open(rn->rn_hostpath, 1271 RUMPUSER_OPEN_WRONLY, &rn->rn_writefd); 1272 } 1273 1274 return error; 1275 } 1276 1277 /* simple readdir. even omits dotstuff and periods */ 1278 static int 1279 rump_vop_readdir(void *v) 1280 { 1281 struct vop_readdir_args /* { 1282 struct vnode *a_vp; 1283 struct uio *a_uio; 1284 kauth_cred_t a_cred; 1285 int *a_eofflag; 1286 off_t **a_cookies; 1287 int *a_ncookies; 1288 } */ *ap = v; 1289 struct vnode *vp = ap->a_vp; 1290 struct uio *uio = ap->a_uio; 1291 struct rumpfs_node *rnd = vp->v_data; 1292 struct rumpfs_dent *rdent; 1293 struct dirent *dentp = NULL; 1294 unsigned i; 1295 int rv = 0; 1296 1297 /* seek to current entry */ 1298 for (i = 0, rdent = LIST_FIRST(&rnd->rn_dir); 1299 (i < uio->uio_offset) && rdent; 1300 i++, rdent = LIST_NEXT(rdent, rd_entries)) 1301 continue; 1302 if (!rdent) 1303 goto out; 1304 1305 /* copy entries */ 1306 dentp = kmem_alloc(sizeof(*dentp), KM_SLEEP); 1307 for (; rdent && uio->uio_resid > 0; 1308 rdent = LIST_NEXT(rdent, rd_entries), i++) { 1309 strlcpy(dentp->d_name, rdent->rd_name, sizeof(dentp->d_name)); 1310 dentp->d_namlen = strlen(dentp->d_name); 1311 dentp->d_reclen = _DIRENT_RECLEN(dentp, dentp->d_namlen); 1312 1313 if (__predict_false(RDENT_ISWHITEOUT(rdent))) { 1314 dentp->d_fileno = INO_WHITEOUT; 1315 dentp->d_type = DT_WHT; 1316 } else { 1317 dentp->d_fileno = rdent->rd_node->rn_va.va_fileid; 1318 dentp->d_type = vtype2dt(rdent->rd_node->rn_va.va_type); 1319 } 1320 1321 if (uio->uio_resid < dentp->d_reclen) { 1322 i--; 1323 break; 1324 } 1325 1326 rv = uiomove(dentp, dentp->d_reclen, uio); 1327 if (rv) { 1328 i--; 1329 break; 1330 } 1331 } 1332 kmem_free(dentp, sizeof(*dentp)); 1333 dentp = NULL; 1334 1335 out: 1336 KASSERT(dentp == NULL); 1337 if (ap->a_cookies) { 1338 *ap->a_ncookies = 0; 1339 *ap->a_cookies = NULL; 1340 } 1341 if (rdent) 1342 *ap->a_eofflag = 0; 1343 else 1344 *ap->a_eofflag = 1; 1345 uio->uio_offset = i; 1346 1347 return rv; 1348 } 1349 1350 static int 1351 etread(struct rumpfs_node *rn, struct uio *uio) 1352 { 1353 struct rumpuser_iovec iov; 1354 uint8_t *buf; 1355 size_t bufsize, n; 1356 int error = 0; 1357 1358 bufsize = uio->uio_resid; 1359 if (bufsize == 0) 1360 return 0; 1361 buf = kmem_alloc(bufsize, KM_SLEEP); 1362 1363 iov.iov_base = buf; 1364 iov.iov_len = bufsize; 1365 if ((error = rumpuser_iovread(rn->rn_readfd, &iov, 1, 1366 uio->uio_offset + rn->rn_offset, &n)) == 0) { 1367 KASSERT(n <= bufsize); 1368 error = uiomove(buf, n, uio); 1369 } 1370 1371 kmem_free(buf, bufsize); 1372 return error; 1373 } 1374 1375 static int 1376 rump_vop_read(void *v) 1377 { 1378 struct vop_read_args /* { 1379 struct vnode *a_vp; 1380 struct uio *a_uio; 1381 int ioflags a_ioflag; 1382 kauth_cred_t a_cred; 1383 }; */ *ap = v; 1384 struct vnode *vp = ap->a_vp; 1385 struct rumpfs_node *rn = vp->v_data; 1386 struct uio *uio = ap->a_uio; 1387 const int advice = IO_ADV_DECODE(ap->a_ioflag); 1388 off_t chunk; 1389 int error = 0; 1390 1391 if (vp->v_type == VDIR) 1392 return EISDIR; 1393 1394 /* et op? */ 1395 if (rn->rn_flags & RUMPNODE_ET_PHONE_HOST) 1396 return etread(rn, uio); 1397 1398 /* otherwise, it's off to ubc with us */ 1399 while (uio->uio_resid > 0) { 1400 chunk = MIN(uio->uio_resid, (off_t)rn->rn_dlen-uio->uio_offset); 1401 if (chunk == 0) 1402 break; 1403 error = ubc_uiomove(&vp->v_uobj, uio, chunk, advice, 1404 UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp)); 1405 if (error) 1406 break; 1407 } 1408 1409 return error; 1410 } 1411 1412 static int 1413 etwrite(struct rumpfs_node *rn, struct uio *uio) 1414 { 1415 struct rumpuser_iovec iov; 1416 uint8_t *buf; 1417 size_t bufsize, n; 1418 int error = 0; 1419 1420 bufsize = uio->uio_resid; 1421 if (bufsize == 0) 1422 return 0; 1423 buf = kmem_alloc(bufsize, KM_SLEEP); 1424 error = uiomove(buf, bufsize, uio); 1425 if (error) 1426 goto out; 1427 1428 KASSERT(uio->uio_resid == 0); 1429 iov.iov_base = buf; 1430 iov.iov_len = bufsize; 1431 if ((error = rumpuser_iovwrite(rn->rn_writefd, &iov, 1, 1432 (uio->uio_offset-bufsize) + rn->rn_offset, &n)) == 0) { 1433 KASSERT(n <= bufsize); 1434 uio->uio_resid = bufsize - n; 1435 } 1436 1437 out: 1438 kmem_free(buf, bufsize); 1439 return error; 1440 } 1441 1442 static int 1443 rump_vop_write(void *v) 1444 { 1445 struct vop_write_args /* { 1446 struct vnode *a_vp; 1447 struct uio *a_uio; 1448 int ioflags a_ioflag; 1449 kauth_cred_t a_cred; 1450 }; */ *ap = v; 1451 struct vnode *vp = ap->a_vp; 1452 struct rumpfs_node *rn = vp->v_data; 1453 struct uio *uio = ap->a_uio; 1454 const int advice = IO_ADV_DECODE(ap->a_ioflag); 1455 void *olddata; 1456 size_t oldlen, newlen; 1457 off_t chunk; 1458 int error = 0; 1459 bool allocd = false; 1460 1461 if (ap->a_ioflag & IO_APPEND) 1462 uio->uio_offset = vp->v_size; 1463 1464 /* consult et? */ 1465 if (rn->rn_flags & RUMPNODE_ET_PHONE_HOST) 1466 return etwrite(rn, uio); 1467 1468 /* 1469 * Otherwise, it's a case of ubcmove. 1470 */ 1471 1472 /* 1473 * First, make sure we have enough storage. 1474 * 1475 * No, you don't need to tell me it's not very efficient. 1476 * No, it doesn't really support sparse files, just fakes it. 1477 */ 1478 newlen = uio->uio_offset + uio->uio_resid; 1479 oldlen = 0; /* XXXgcc */ 1480 olddata = NULL; 1481 if (rn->rn_dlen < newlen) { 1482 oldlen = rn->rn_dlen; 1483 olddata = rn->rn_data; 1484 1485 rn->rn_data = rump_hypermalloc(newlen, 0, true, "rumpfs"); 1486 rn->rn_dlen = newlen; 1487 memset(rn->rn_data, 0, newlen); 1488 memcpy(rn->rn_data, olddata, oldlen); 1489 allocd = true; 1490 uvm_vnp_setsize(vp, newlen); 1491 } 1492 1493 /* ok, we have enough stooorage. write */ 1494 while (uio->uio_resid > 0) { 1495 chunk = MIN(uio->uio_resid, (off_t)rn->rn_dlen-uio->uio_offset); 1496 if (chunk == 0) 1497 break; 1498 error = ubc_uiomove(&vp->v_uobj, uio, chunk, advice, 1499 UBC_WRITE | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp)); 1500 if (error) 1501 break; 1502 } 1503 1504 if (allocd) { 1505 if (error) { 1506 rump_hyperfree(rn->rn_data, newlen); 1507 rn->rn_data = olddata; 1508 rn->rn_dlen = oldlen; 1509 uvm_vnp_setsize(vp, oldlen); 1510 } else { 1511 rump_hyperfree(olddata, oldlen); 1512 } 1513 } 1514 1515 return error; 1516 } 1517 1518 static int 1519 rump_vop_bmap(void *v) 1520 { 1521 struct vop_bmap_args /* { 1522 struct vnode *a_vp; 1523 daddr_t a_bn; 1524 struct vnode **a_vpp; 1525 daddr_t *a_bnp; 1526 int *a_runp; 1527 } */ *ap = v; 1528 1529 /* 1:1 mapping */ 1530 if (ap->a_vpp) 1531 *ap->a_vpp = ap->a_vp; 1532 if (ap->a_bnp) 1533 *ap->a_bnp = ap->a_bn; 1534 if (ap->a_runp) 1535 *ap->a_runp = 16; 1536 1537 return 0; 1538 } 1539 1540 static int 1541 rump_vop_strategy(void *v) 1542 { 1543 struct vop_strategy_args /* { 1544 struct vnode *a_vp; 1545 struct buf *a_bp; 1546 } */ *ap = v; 1547 struct vnode *vp = ap->a_vp; 1548 struct rumpfs_node *rn = vp->v_data; 1549 struct buf *bp = ap->a_bp; 1550 off_t copylen, copyoff; 1551 int error; 1552 1553 if (vp->v_type != VREG || rn->rn_flags & RUMPNODE_ET_PHONE_HOST) { 1554 error = EINVAL; 1555 goto out; 1556 } 1557 1558 copyoff = bp->b_blkno << DEV_BSHIFT; 1559 copylen = MIN(rn->rn_dlen - copyoff, bp->b_bcount); 1560 if (BUF_ISWRITE(bp)) { 1561 memcpy((uint8_t *)rn->rn_data + copyoff, bp->b_data, copylen); 1562 } else { 1563 memset((uint8_t*)bp->b_data + copylen, 0, bp->b_bcount-copylen); 1564 memcpy(bp->b_data, (uint8_t *)rn->rn_data + copyoff, copylen); 1565 } 1566 bp->b_resid = 0; 1567 error = 0; 1568 1569 out: 1570 bp->b_error = error; 1571 biodone(bp); 1572 return 0; 1573 } 1574 1575 static int 1576 rump_vop_pathconf(void *v) 1577 { 1578 struct vop_pathconf_args /* { 1579 struct vnode *a_vp; 1580 int a_name; 1581 register_t *a_retval; 1582 }; */ *ap = v; 1583 int name = ap->a_name; 1584 register_t *retval = ap->a_retval; 1585 1586 switch (name) { 1587 case _PC_LINK_MAX: 1588 *retval = LINK_MAX; 1589 return 0; 1590 case _PC_NAME_MAX: 1591 *retval = RUMPFS_MAXNAMLEN; 1592 return 0; 1593 case _PC_PATH_MAX: 1594 *retval = PATH_MAX; 1595 return 0; 1596 case _PC_PIPE_BUF: 1597 *retval = PIPE_BUF; 1598 return 0; 1599 case _PC_CHOWN_RESTRICTED: 1600 *retval = 1; 1601 return 0; 1602 case _PC_NO_TRUNC: 1603 *retval = 1; 1604 return 0; 1605 case _PC_SYNC_IO: 1606 *retval = 1; 1607 return 0; 1608 case _PC_FILESIZEBITS: 1609 *retval = 43; /* this one goes to 11 */ 1610 return 0; 1611 case _PC_SYMLINK_MAX: 1612 *retval = MAXPATHLEN; 1613 return 0; 1614 case _PC_2_SYMLINKS: 1615 *retval = 1; 1616 return 0; 1617 default: 1618 return EINVAL; 1619 } 1620 } 1621 1622 static int 1623 rump_vop_success(void *v) 1624 { 1625 1626 return 0; 1627 } 1628 1629 static int 1630 rump_vop_inactive(void *v) 1631 { 1632 struct vop_inactive_args /* { 1633 struct vnode *a_vp; 1634 bool *a_recycle; 1635 } */ *ap = v; 1636 struct vnode *vp = ap->a_vp; 1637 struct rumpfs_node *rn = vp->v_data; 1638 1639 if (rn->rn_flags & RUMPNODE_ET_PHONE_HOST && vp->v_type == VREG) { 1640 if (rn->rn_readfd != -1) { 1641 rumpuser_close(rn->rn_readfd); 1642 rn->rn_readfd = -1; 1643 } 1644 if (rn->rn_writefd != -1) { 1645 rumpuser_close(rn->rn_writefd); 1646 rn->rn_writefd = -1; 1647 } 1648 } 1649 *ap->a_recycle = (rn->rn_flags & RUMPNODE_CANRECLAIM) ? true : false; 1650 1651 VOP_UNLOCK(vp); 1652 return 0; 1653 } 1654 1655 static int 1656 rump_vop_reclaim(void *v) 1657 { 1658 struct vop_reclaim_args /* { 1659 struct vnode *a_vp; 1660 } */ *ap = v; 1661 struct vnode *vp = ap->a_vp; 1662 struct rumpfs_node *rn = vp->v_data; 1663 1664 mutex_enter(&reclock); 1665 rn->rn_vp = NULL; 1666 mutex_exit(&reclock); 1667 genfs_node_destroy(vp); 1668 vp->v_data = NULL; 1669 1670 if (rn->rn_flags & RUMPNODE_CANRECLAIM) { 1671 if (vp->v_type == VLNK) 1672 PNBUF_PUT(rn->rn_linktarg); 1673 if (rn->rn_hostpath) 1674 free(rn->rn_hostpath, M_TEMP); 1675 kmem_free(rn, sizeof(*rn)); 1676 } 1677 1678 return 0; 1679 } 1680 1681 static int 1682 rump_vop_spec(void *v) 1683 { 1684 struct vop_generic_args *ap = v; 1685 int (**opvec)(void *); 1686 1687 switch (ap->a_desc->vdesc_offset) { 1688 case VOP_ACCESS_DESCOFFSET: 1689 case VOP_GETATTR_DESCOFFSET: 1690 case VOP_SETATTR_DESCOFFSET: 1691 case VOP_LOCK_DESCOFFSET: 1692 case VOP_UNLOCK_DESCOFFSET: 1693 case VOP_ISLOCKED_DESCOFFSET: 1694 case VOP_RECLAIM_DESCOFFSET: 1695 opvec = rump_vnodeop_p; 1696 break; 1697 default: 1698 opvec = spec_vnodeop_p; 1699 break; 1700 } 1701 1702 return VOCALL(opvec, ap->a_desc->vdesc_offset, v); 1703 } 1704 1705 static int 1706 rump_vop_advlock(void *v) 1707 { 1708 struct vop_advlock_args /* { 1709 const struct vnodeop_desc *a_desc; 1710 struct vnode *a_vp; 1711 void *a_id; 1712 int a_op; 1713 struct flock *a_fl; 1714 int a_flags; 1715 } */ *ap = v; 1716 struct vnode *vp = ap->a_vp; 1717 struct rumpfs_node *rn = vp->v_data; 1718 1719 return lf_advlock(ap, &rn->rn_lockf, vp->v_size); 1720 } 1721 1722 /* 1723 * Begin vfs-level stuff 1724 */ 1725 1726 VFS_PROTOS(rumpfs); 1727 struct vfsops rumpfs_vfsops = { 1728 .vfs_name = MOUNT_RUMPFS, 1729 .vfs_min_mount_data = 0, 1730 .vfs_mount = rumpfs_mount, 1731 .vfs_start = (void *)nullop, 1732 .vfs_unmount = rumpfs_unmount, 1733 .vfs_root = rumpfs_root, 1734 .vfs_quotactl = (void *)eopnotsupp, 1735 .vfs_statvfs = genfs_statvfs, 1736 .vfs_sync = (void *)nullop, 1737 .vfs_vget = rumpfs_vget, 1738 .vfs_fhtovp = (void *)eopnotsupp, 1739 .vfs_vptofh = (void *)eopnotsupp, 1740 .vfs_init = rumpfs_init, 1741 .vfs_reinit = NULL, 1742 .vfs_done = rumpfs_done, 1743 .vfs_mountroot = rumpfs_mountroot, 1744 .vfs_snapshot = (void *)eopnotsupp, 1745 .vfs_extattrctl = (void *)eopnotsupp, 1746 .vfs_suspendctl = (void *)eopnotsupp, 1747 .vfs_renamelock_enter = genfs_renamelock_enter, 1748 .vfs_renamelock_exit = genfs_renamelock_exit, 1749 .vfs_opv_descs = rump_opv_descs, 1750 /* vfs_refcount */ 1751 /* vfs_list */ 1752 }; 1753 1754 static int 1755 rumpfs_mountfs(struct mount *mp) 1756 { 1757 struct rumpfs_mount *rfsmp; 1758 struct rumpfs_node *rn; 1759 int error; 1760 1761 rfsmp = kmem_alloc(sizeof(*rfsmp), KM_SLEEP); 1762 1763 rn = makeprivate(VDIR, RUMPFS_DEFAULTMODE, NODEV, DEV_BSIZE, false); 1764 rn->rn_parent = rn; 1765 if ((error = makevnode(mp, rn, &rfsmp->rfsmp_rvp)) != 0) 1766 return error; 1767 1768 rfsmp->rfsmp_rvp->v_vflag |= VV_ROOT; 1769 VOP_UNLOCK(rfsmp->rfsmp_rvp); 1770 1771 mp->mnt_data = rfsmp; 1772 mp->mnt_stat.f_namemax = RUMPFS_MAXNAMLEN; 1773 mp->mnt_stat.f_iosize = 512; 1774 mp->mnt_flag |= MNT_LOCAL; 1775 mp->mnt_iflag |= IMNT_MPSAFE | IMNT_CAN_RWTORO; 1776 mp->mnt_fs_bshift = DEV_BSHIFT; 1777 vfs_getnewfsid(mp); 1778 1779 return 0; 1780 } 1781 1782 int 1783 rumpfs_mount(struct mount *mp, const char *mntpath, void *arg, size_t *alen) 1784 { 1785 int error; 1786 1787 if (mp->mnt_flag & MNT_UPDATE) { 1788 return 0; 1789 } 1790 1791 error = set_statvfs_info(mntpath, UIO_USERSPACE, "rumpfs", UIO_SYSSPACE, 1792 mp->mnt_op->vfs_name, mp, curlwp); 1793 if (error) 1794 return error; 1795 1796 return rumpfs_mountfs(mp); 1797 } 1798 1799 int 1800 rumpfs_unmount(struct mount *mp, int mntflags) 1801 { 1802 struct rumpfs_mount *rfsmp = mp->mnt_data; 1803 int flags = 0, error; 1804 1805 if (panicstr || mntflags & MNT_FORCE) 1806 flags |= FORCECLOSE; 1807 1808 if ((error = vflush(mp, rfsmp->rfsmp_rvp, flags)) != 0) 1809 return error; 1810 vgone(rfsmp->rfsmp_rvp); /* XXX */ 1811 1812 kmem_free(rfsmp, sizeof(*rfsmp)); 1813 1814 return 0; 1815 } 1816 1817 int 1818 rumpfs_root(struct mount *mp, struct vnode **vpp) 1819 { 1820 struct rumpfs_mount *rfsmp = mp->mnt_data; 1821 1822 vref(rfsmp->rfsmp_rvp); 1823 vn_lock(rfsmp->rfsmp_rvp, LK_EXCLUSIVE | LK_RETRY); 1824 *vpp = rfsmp->rfsmp_rvp; 1825 return 0; 1826 } 1827 1828 int 1829 rumpfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 1830 { 1831 1832 return EOPNOTSUPP; 1833 } 1834 1835 void 1836 rumpfs_init() 1837 { 1838 1839 CTASSERT(RUMP_ETFS_SIZE_ENDOFF == RUMPBLK_SIZENOTSET); 1840 1841 mutex_init(&reclock, MUTEX_DEFAULT, IPL_NONE); 1842 mutex_init(&etfs_lock, MUTEX_DEFAULT, IPL_NONE); 1843 } 1844 1845 void 1846 rumpfs_done() 1847 { 1848 1849 mutex_destroy(&reclock); 1850 mutex_destroy(&etfs_lock); 1851 } 1852 1853 int 1854 rumpfs_mountroot() 1855 { 1856 struct mount *mp; 1857 int error; 1858 1859 if ((error = vfs_rootmountalloc(MOUNT_RUMPFS, "rootdev", &mp)) != 0) { 1860 vrele(rootvp); 1861 return error; 1862 } 1863 1864 if ((error = rumpfs_mountfs(mp)) != 0) 1865 panic("mounting rootfs failed: %d", error); 1866 1867 mutex_enter(&mountlist_lock); 1868 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 1869 mutex_exit(&mountlist_lock); 1870 1871 error = set_statvfs_info("/", UIO_SYSSPACE, "rumpfs", UIO_SYSSPACE, 1872 mp->mnt_op->vfs_name, mp, curlwp); 1873 if (error) 1874 panic("set_statvfs_info failed for rootfs: %d", error); 1875 1876 mp->mnt_flag &= ~MNT_RDONLY; 1877 vfs_unbusy(mp, false, NULL); 1878 1879 return 0; 1880 } 1881
Indexes created Wed Oct 15 16:09:53 GMT 2025