rumpfs.c revision 1.112
1 /* $NetBSD: rumpfs.c,v 1.112 2013/04/07 18:42:49 stacktic 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 1.112 2013/04/07 18:42:49 stacktic 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 static void freedir(struct rumpfs_node *, struct componentname *); 222 static struct rumpfs_node *makeprivate(enum vtype, dev_t, off_t, bool); 223 224 /* 225 * Extra Terrestrial stuff. We map a given key (pathname) to a file on 226 * the host FS. ET phones home only from the root node of rumpfs. 227 * 228 * When an etfs node is removed, a vnode potentially behind it is not 229 * immediately recycled. 230 */ 231 232 struct etfs { 233 char et_key[MAXPATHLEN]; 234 size_t et_keylen; 235 bool et_prefixkey; 236 bool et_removing; 237 devminor_t et_blkmin; 238 239 LIST_ENTRY(etfs) et_entries; 240 241 struct rumpfs_node *et_rn; 242 }; 243 static kmutex_t etfs_lock; 244 static LIST_HEAD(, etfs) etfs_list = LIST_HEAD_INITIALIZER(etfs_list); 245 246 static enum vtype 247 ettype_to_vtype(enum rump_etfs_type et) 248 { 249 enum vtype vt; 250 251 switch (et) { 252 case RUMP_ETFS_REG: 253 vt = VREG; 254 break; 255 case RUMP_ETFS_BLK: 256 vt = VBLK; 257 break; 258 case RUMP_ETFS_CHR: 259 vt = VCHR; 260 break; 261 case RUMP_ETFS_DIR: 262 vt = VDIR; 263 break; 264 case RUMP_ETFS_DIR_SUBDIRS: 265 vt = VDIR; 266 break; 267 default: 268 panic("invalid et type: %d", et); 269 } 270 271 return vt; 272 } 273 274 static enum vtype 275 hft_to_vtype(int hft) 276 { 277 enum vtype vt; 278 279 switch (hft) { 280 case RUMPUSER_FT_OTHER: 281 vt = VNON; 282 break; 283 case RUMPUSER_FT_DIR: 284 vt = VDIR; 285 break; 286 case RUMPUSER_FT_REG: 287 vt = VREG; 288 break; 289 case RUMPUSER_FT_BLK: 290 vt = VBLK; 291 break; 292 case RUMPUSER_FT_CHR: 293 vt = VCHR; 294 break; 295 default: 296 vt = VNON; 297 break; 298 } 299 300 return vt; 301 } 302 303 static bool 304 etfs_find(const char *key, struct etfs **etp, bool forceprefix) 305 { 306 struct etfs *et; 307 size_t keylen = strlen(key); 308 309 KASSERT(mutex_owned(&etfs_lock)); 310 311 LIST_FOREACH(et, &etfs_list, et_entries) { 312 if ((keylen == et->et_keylen || et->et_prefixkey || forceprefix) 313 && strncmp(key, et->et_key, et->et_keylen) == 0) { 314 if (etp) 315 *etp = et; 316 return true; 317 } 318 } 319 320 return false; 321 } 322 323 #define REGDIR(ftype) \ 324 ((ftype) == RUMP_ETFS_DIR || (ftype) == RUMP_ETFS_DIR_SUBDIRS) 325 static int 326 doregister(const char *key, const char *hostpath, 327 enum rump_etfs_type ftype, uint64_t begin, uint64_t size) 328 { 329 char buf[9]; 330 struct etfs *et; 331 struct rumpfs_node *rn; 332 uint64_t fsize; 333 dev_t rdev = NODEV; 334 devminor_t dmin = -1; 335 int hft, error; 336 337 if (key[0] != '/') { 338 return EINVAL; 339 } 340 while (key[0] == '/') { 341 key++; 342 } 343 344 if (rumpuser_getfileinfo(hostpath, &fsize, &hft, &error)) 345 return error; 346 347 /* etfs directory requires a directory on the host */ 348 if (REGDIR(ftype)) { 349 if (hft != RUMPUSER_FT_DIR) 350 return ENOTDIR; 351 if (begin != 0) 352 return EISDIR; 353 if (size != RUMP_ETFS_SIZE_ENDOFF) 354 return EISDIR; 355 size = fsize; 356 } else { 357 if (begin > fsize) 358 return EINVAL; 359 if (size == RUMP_ETFS_SIZE_ENDOFF) 360 size = fsize - begin; 361 if (begin + size > fsize) 362 return EINVAL; 363 } 364 365 if (ftype == RUMP_ETFS_BLK || ftype == RUMP_ETFS_CHR) { 366 error = rumpblk_register(hostpath, &dmin, begin, size); 367 if (error != 0) { 368 return error; 369 } 370 rdev = makedev(RUMPBLK_DEVMAJOR, dmin); 371 } 372 373 et = kmem_alloc(sizeof(*et), KM_SLEEP); 374 strcpy(et->et_key, key); 375 et->et_keylen = strlen(et->et_key); 376 et->et_rn = rn = makeprivate(ettype_to_vtype(ftype), rdev, size, true); 377 et->et_removing = false; 378 et->et_blkmin = dmin; 379 380 rn->rn_flags |= RUMPNODE_ET_PHONE_HOST; 381 382 if (ftype == RUMP_ETFS_REG || REGDIR(ftype) || et->et_blkmin != -1) { 383 size_t len = strlen(hostpath)+1; 384 385 rn->rn_hostpath = malloc(len, M_TEMP, M_WAITOK | M_ZERO); 386 memcpy(rn->rn_hostpath, hostpath, len); 387 rn->rn_offset = begin; 388 } 389 390 if (REGDIR(ftype)) { 391 rn->rn_flags |= RUMPNODE_DIR_ET; 392 et->et_prefixkey = true; 393 } else { 394 et->et_prefixkey = false; 395 } 396 397 if (ftype == RUMP_ETFS_DIR_SUBDIRS) 398 rn->rn_flags |= RUMPNODE_DIR_ETSUBS; 399 400 mutex_enter(&etfs_lock); 401 if (etfs_find(key, NULL, REGDIR(ftype))) { 402 mutex_exit(&etfs_lock); 403 if (et->et_blkmin != -1) 404 rumpblk_deregister(hostpath); 405 if (et->et_rn->rn_hostpath != NULL) 406 free(et->et_rn->rn_hostpath, M_TEMP); 407 kmem_free(et->et_rn, sizeof(*et->et_rn)); 408 kmem_free(et, sizeof(*et)); 409 return EEXIST; 410 } 411 LIST_INSERT_HEAD(&etfs_list, et, et_entries); 412 mutex_exit(&etfs_lock); 413 414 if (ftype == RUMP_ETFS_BLK) { 415 format_bytes(buf, sizeof(buf), size); 416 aprint_verbose("/%s: hostpath %s (%s)\n", key, hostpath, buf); 417 } 418 419 return 0; 420 } 421 #undef REGDIR 422 423 int 424 rump_etfs_register(const char *key, const char *hostpath, 425 enum rump_etfs_type ftype) 426 { 427 428 return doregister(key, hostpath, ftype, 0, RUMP_ETFS_SIZE_ENDOFF); 429 } 430 431 int 432 rump_etfs_register_withsize(const char *key, const char *hostpath, 433 enum rump_etfs_type ftype, uint64_t begin, uint64_t size) 434 { 435 436 return doregister(key, hostpath, ftype, begin, size); 437 } 438 439 /* remove etfs mapping. caller's responsibility to make sure it's not in use */ 440 int 441 rump_etfs_remove(const char *key) 442 { 443 struct etfs *et; 444 size_t keylen; 445 int rv; 446 447 if (key[0] != '/') { 448 return EINVAL; 449 } 450 while (key[0] == '/') { 451 key++; 452 } 453 454 keylen = strlen(key); 455 456 mutex_enter(&etfs_lock); 457 LIST_FOREACH(et, &etfs_list, et_entries) { 458 if (keylen == et->et_keylen && strcmp(et->et_key, key) == 0) { 459 if (et->et_removing) 460 et = NULL; 461 else 462 et->et_removing = true; 463 break; 464 } 465 } 466 mutex_exit(&etfs_lock); 467 if (!et) 468 return ENOENT; 469 470 /* 471 * ok, we know what we want to remove and have signalled there 472 * actually are men at work. first, unregister from rumpblk 473 */ 474 if (et->et_blkmin != -1) { 475 rv = rumpblk_deregister(et->et_rn->rn_hostpath); 476 } else { 477 rv = 0; 478 } 479 KASSERT(rv == 0); 480 481 /* then do the actual removal */ 482 mutex_enter(&etfs_lock); 483 LIST_REMOVE(et, et_entries); 484 mutex_exit(&etfs_lock); 485 486 /* node is unreachable, safe to nuke all device copies */ 487 if (et->et_blkmin != -1) { 488 vdevgone(RUMPBLK_DEVMAJOR, et->et_blkmin, et->et_blkmin, VBLK); 489 } else { 490 struct vnode *vp; 491 492 mutex_enter(&reclock); 493 if ((vp = et->et_rn->rn_vp) != NULL) 494 mutex_enter(vp->v_interlock); 495 mutex_exit(&reclock); 496 if (vp && vget(vp, 0) == 0) 497 vgone(vp); 498 } 499 500 if (et->et_rn->rn_hostpath != NULL) 501 free(et->et_rn->rn_hostpath, M_TEMP); 502 kmem_free(et->et_rn, sizeof(*et->et_rn)); 503 kmem_free(et, sizeof(*et)); 504 505 return 0; 506 } 507 508 /* 509 * rumpfs 510 */ 511 512 static struct rumpfs_node * 513 makeprivate(enum vtype vt, dev_t rdev, off_t size, bool et) 514 { 515 struct rumpfs_node *rn; 516 struct vattr *va; 517 struct timespec ts; 518 519 rn = kmem_zalloc(sizeof(*rn), KM_SLEEP); 520 521 switch (vt) { 522 case VDIR: 523 LIST_INIT(&rn->rn_dir); 524 break; 525 case VREG: 526 if (et) { 527 rn->rn_readfd = -1; 528 rn->rn_writefd = -1; 529 } 530 break; 531 default: 532 break; 533 } 534 535 nanotime(&ts); 536 537 va = &rn->rn_va; 538 va->va_type = vt; 539 va->va_mode = 0755; 540 if (vt == VDIR) 541 va->va_nlink = 2; 542 else 543 va->va_nlink = 1; 544 va->va_uid = 0; 545 va->va_gid = 0; 546 va->va_fsid = 547 va->va_fileid = atomic_inc_uint_nv(&lastino); 548 va->va_size = size; 549 va->va_blocksize = 512; 550 va->va_atime = ts; 551 va->va_mtime = ts; 552 va->va_ctime = ts; 553 va->va_birthtime = ts; 554 va->va_gen = 0; 555 va->va_flags = 0; 556 va->va_rdev = rdev; 557 va->va_bytes = 512; 558 va->va_filerev = 0; 559 va->va_vaflags = 0; 560 561 return rn; 562 } 563 564 static int 565 makevnode(struct mount *mp, struct rumpfs_node *rn, struct vnode **vpp) 566 { 567 struct vnode *vp; 568 int (**vpops)(void *); 569 struct vattr *va = &rn->rn_va; 570 int rv; 571 572 KASSERT(!mutex_owned(&reclock)); 573 574 if (va->va_type == VCHR || va->va_type == VBLK) { 575 vpops = rump_specop_p; 576 } else { 577 vpops = rump_vnodeop_p; 578 } 579 580 rv = getnewvnode(VT_RUMP, mp, vpops, NULL, &vp); 581 if (rv) 582 return rv; 583 584 vp->v_size = vp->v_writesize = va->va_size; 585 vp->v_type = va->va_type; 586 587 if (vpops == rump_specop_p) { 588 spec_node_init(vp, va->va_rdev); 589 } 590 vp->v_data = rn; 591 592 genfs_node_init(vp, &rumpfs_genfsops); 593 vn_lock(vp, LK_RETRY | LK_EXCLUSIVE); 594 mutex_enter(&reclock); 595 rn->rn_vp = vp; 596 mutex_exit(&reclock); 597 598 *vpp = vp; 599 600 return 0; 601 } 602 603 604 static void 605 makedir(struct rumpfs_node *rnd, 606 struct componentname *cnp, struct rumpfs_node *rn) 607 { 608 struct rumpfs_dent *rdent; 609 610 rdent = kmem_alloc(sizeof(*rdent), KM_SLEEP); 611 rdent->rd_name = kmem_alloc(cnp->cn_namelen+1, KM_SLEEP); 612 rdent->rd_node = rn; 613 strlcpy(rdent->rd_name, cnp->cn_nameptr, cnp->cn_namelen+1); 614 rdent->rd_namelen = strlen(rdent->rd_name); 615 616 if ((cnp->cn_flags & ISWHITEOUT) != 0) { 617 KASSERT((cnp->cn_flags & DOWHITEOUT) == 0); 618 freedir(rnd, cnp); 619 } 620 LIST_INSERT_HEAD(&rnd->rn_dir, rdent, rd_entries); 621 } 622 623 static void 624 freedir(struct rumpfs_node *rnd, struct componentname *cnp) 625 { 626 struct rumpfs_dent *rd = NULL; 627 628 LIST_FOREACH(rd, &rnd->rn_dir, rd_entries) { 629 if (rd->rd_namelen == cnp->cn_namelen && 630 strncmp(rd->rd_name, cnp->cn_nameptr, 631 cnp->cn_namelen) == 0) 632 break; 633 } 634 if (rd == NULL) 635 panic("could not find directory entry: %s", cnp->cn_nameptr); 636 637 if (cnp->cn_flags & DOWHITEOUT) { 638 rd->rd_node = RUMPFS_WHITEOUT; 639 } else { 640 LIST_REMOVE(rd, rd_entries); 641 kmem_free(rd->rd_name, rd->rd_namelen+1); 642 kmem_free(rd, sizeof(*rd)); 643 } 644 } 645 646 /* 647 * Simple lookup for rump file systems. 648 * 649 * uhm, this is twisted. C F C C, hope of C C F C looming 650 */ 651 static int 652 rump_vop_lookup(void *v) 653 { 654 struct vop_lookup_args /* { 655 struct vnode *a_dvp; 656 struct vnode **a_vpp; 657 struct componentname *a_cnp; 658 }; */ *ap = v; 659 struct componentname *cnp = ap->a_cnp; 660 struct vnode *dvp = ap->a_dvp; 661 struct vnode **vpp = ap->a_vpp; 662 struct vnode *vp; 663 struct rumpfs_node *rnd = dvp->v_data, *rn; 664 struct rumpfs_dent *rd = NULL; 665 struct etfs *et; 666 bool dotdot = (cnp->cn_flags & ISDOTDOT) != 0; 667 int rv = 0; 668 const char *cp; 669 670 *vpp = NULL; 671 672 rv = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 673 if (rv) 674 return rv; 675 676 if ((cnp->cn_flags & ISLASTCN) 677 && (dvp->v_mount->mnt_flag & MNT_RDONLY) 678 && (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 679 return EROFS; 680 681 /* check for dot, return directly if the case */ 682 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 683 vref(dvp); 684 *vpp = dvp; 685 return 0; 686 } 687 688 /* we don't do rename */ 689 if (!(((cnp->cn_flags & ISLASTCN) == 0) || (cnp->cn_nameiop != RENAME))) 690 return EOPNOTSUPP; 691 692 /* check for etfs */ 693 if (dvp == rootvnode && 694 (cnp->cn_nameiop == LOOKUP || cnp->cn_nameiop == CREATE)) { 695 bool found; 696 mutex_enter(&etfs_lock); 697 found = etfs_find(cnp->cn_nameptr, &et, false); 698 mutex_exit(&etfs_lock); 699 700 if (found) { 701 rn = et->et_rn; 702 cnp->cn_consume += et->et_keylen - cnp->cn_namelen; 703 /* 704 * consume trailing slashes if any and clear 705 * REQUIREDIR if we consumed the full path. 706 */ 707 cp = &cnp->cn_nameptr[cnp->cn_namelen]; 708 cp += cnp->cn_consume; 709 KASSERT(*cp == '\0' || *cp == '/'); 710 if (*cp == '\0' && rn->rn_va.va_type != VDIR) 711 cnp->cn_flags &= ~REQUIREDIR; 712 while (*cp++ == '/') 713 cnp->cn_consume++; 714 goto getvnode; 715 } 716 } 717 718 if (rnd->rn_flags & RUMPNODE_DIR_ET) { 719 uint64_t fsize; 720 char *newpath; 721 size_t newpathlen; 722 int hft, error; 723 724 if (dotdot) 725 return EOPNOTSUPP; 726 727 newpathlen = strlen(rnd->rn_hostpath) + 1 + cnp->cn_namelen + 1; 728 newpath = malloc(newpathlen, M_TEMP, M_WAITOK); 729 730 strlcpy(newpath, rnd->rn_hostpath, newpathlen); 731 strlcat(newpath, "/", newpathlen); 732 strlcat(newpath, cnp->cn_nameptr, newpathlen); 733 734 if (rumpuser_getfileinfo(newpath, &fsize, &hft, &error)) { 735 free(newpath, M_TEMP); 736 return error; 737 } 738 739 /* allow only dirs and regular files */ 740 if (hft != RUMPUSER_FT_REG && hft != RUMPUSER_FT_DIR) { 741 free(newpath, M_TEMP); 742 return ENOENT; 743 } 744 745 rn = makeprivate(hft_to_vtype(hft), NODEV, fsize, true); 746 rn->rn_flags |= RUMPNODE_CANRECLAIM; 747 if (rnd->rn_flags & RUMPNODE_DIR_ETSUBS) { 748 rn->rn_flags |= RUMPNODE_DIR_ET | RUMPNODE_DIR_ETSUBS; 749 rn->rn_flags |= RUMPNODE_ET_PHONE_HOST; 750 } 751 rn->rn_hostpath = newpath; 752 753 goto getvnode; 754 } else { 755 if (dotdot) { 756 if ((rn = rnd->rn_parent) != NULL) 757 goto getvnode; 758 } else { 759 LIST_FOREACH(rd, &rnd->rn_dir, rd_entries) { 760 if (rd->rd_namelen == cnp->cn_namelen && 761 strncmp(rd->rd_name, cnp->cn_nameptr, 762 cnp->cn_namelen) == 0) 763 break; 764 } 765 } 766 } 767 768 if (!rd && ((cnp->cn_flags & ISLASTCN) == 0||cnp->cn_nameiop != CREATE)) 769 return ENOENT; 770 771 if (!rd && (cnp->cn_flags & ISLASTCN) && cnp->cn_nameiop == CREATE) { 772 if (dvp->v_mount->mnt_flag & MNT_RDONLY) 773 return EROFS; 774 rv = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 775 if (rv) 776 return rv; 777 return EJUSTRETURN; 778 } 779 780 if ((cnp->cn_flags & ISLASTCN) && cnp->cn_nameiop == DELETE) { 781 rv = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred); 782 if (rv) 783 return rv; 784 } 785 786 if (RDENT_ISWHITEOUT(rd)) { 787 cnp->cn_flags |= ISWHITEOUT; 788 if ((cnp->cn_flags & ISLASTCN) && cnp->cn_nameiop == CREATE) 789 return EJUSTRETURN; 790 return ENOENT; 791 } 792 793 rn = rd->rd_node; 794 795 getvnode: 796 KASSERT(rn); 797 if (dotdot) 798 VOP_UNLOCK(dvp); 799 mutex_enter(&reclock); 800 if ((vp = rn->rn_vp)) { 801 mutex_enter(vp->v_interlock); 802 mutex_exit(&reclock); 803 if (vget(vp, LK_EXCLUSIVE)) { 804 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 805 goto getvnode; 806 } 807 *vpp = vp; 808 } else { 809 mutex_exit(&reclock); 810 rv = makevnode(dvp->v_mount, rn, vpp); 811 } 812 if (dotdot) 813 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 814 815 return rv; 816 } 817 818 static int 819 rump_check_possible(struct vnode *vp, struct rumpfs_node *rnode, 820 mode_t mode) 821 { 822 823 if ((mode & VWRITE) == 0) 824 return 0; 825 826 switch (vp->v_type) { 827 case VDIR: 828 case VLNK: 829 case VREG: 830 break; 831 default: 832 /* special file is always writable. */ 833 return 0; 834 } 835 836 return vp->v_mount->mnt_flag & MNT_RDONLY ? EROFS : 0; 837 } 838 839 static int 840 rump_check_permitted(struct vnode *vp, struct rumpfs_node *rnode, 841 mode_t mode, kauth_cred_t cred) 842 { 843 struct vattr *attr = &rnode->rn_va; 844 845 return genfs_can_access(vp->v_type, attr->va_mode, attr->va_uid, 846 attr->va_gid, mode, cred); 847 } 848 849 int 850 rump_vop_access(void *v) 851 { 852 struct vop_access_args /* { 853 const struct vnodeop_desc *a_desc; 854 struct vnode *a_vp; 855 int a_mode; 856 kauth_cred_t a_cred; 857 } */ *ap = v; 858 struct vnode *vp = ap->a_vp; 859 struct rumpfs_node *rn = vp->v_data; 860 int error; 861 862 error = rump_check_possible(vp, rn, ap->a_mode); 863 if (error) 864 return error; 865 866 error = rump_check_permitted(vp, rn, ap->a_mode, ap->a_cred); 867 868 return error; 869 } 870 871 static int 872 rump_vop_getattr(void *v) 873 { 874 struct vop_getattr_args /* { 875 struct vnode *a_vp; 876 struct vattr *a_vap; 877 kauth_cred_t a_cred; 878 } */ *ap = v; 879 struct vnode *vp = ap->a_vp; 880 struct rumpfs_node *rn = vp->v_data; 881 struct vattr *vap = ap->a_vap; 882 883 memcpy(vap, &rn->rn_va, sizeof(struct vattr)); 884 vap->va_size = vp->v_size; 885 return 0; 886 } 887 888 static int 889 rump_vop_setattr(void *v) 890 { 891 struct vop_setattr_args /* { 892 struct vnode *a_vp; 893 struct vattr *a_vap; 894 kauth_cred_t a_cred; 895 } */ *ap = v; 896 struct vnode *vp = ap->a_vp; 897 struct vattr *vap = ap->a_vap; 898 struct rumpfs_node *rn = vp->v_data; 899 struct vattr *attr = &rn->rn_va; 900 kauth_cred_t cred = ap->a_cred; 901 int error; 902 903 #define CHANGED(a, t) (vap->a != (t)VNOVAL) 904 #define SETIFVAL(a,t) if (CHANGED(a, t)) rn->rn_va.a = vap->a 905 if (CHANGED(va_atime.tv_sec, time_t) || 906 CHANGED(va_ctime.tv_sec, time_t) || 907 CHANGED(va_mtime.tv_sec, time_t) || 908 CHANGED(va_birthtime.tv_sec, time_t) || 909 CHANGED(va_atime.tv_nsec, long) || 910 CHANGED(va_ctime.tv_nsec, long) || 911 CHANGED(va_mtime.tv_nsec, long) || 912 CHANGED(va_birthtime.tv_nsec, long)) { 913 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_TIMES, vp, 914 NULL, genfs_can_chtimes(vp, vap->va_vaflags, attr->va_uid, 915 cred)); 916 if (error) 917 return error; 918 } 919 920 SETIFVAL(va_atime.tv_sec, time_t); 921 SETIFVAL(va_ctime.tv_sec, time_t); 922 SETIFVAL(va_mtime.tv_sec, time_t); 923 SETIFVAL(va_birthtime.tv_sec, time_t); 924 SETIFVAL(va_atime.tv_nsec, long); 925 SETIFVAL(va_ctime.tv_nsec, long); 926 SETIFVAL(va_mtime.tv_nsec, long); 927 SETIFVAL(va_birthtime.tv_nsec, long); 928 929 if (CHANGED(va_flags, u_long)) { 930 /* XXX Can we handle system flags here...? */ 931 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_FLAGS, vp, 932 NULL, genfs_can_chflags(cred, vp->v_type, attr->va_uid, 933 false)); 934 if (error) 935 return error; 936 } 937 938 SETIFVAL(va_flags, u_long); 939 #undef SETIFVAL 940 #undef CHANGED 941 942 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (uid_t)VNOVAL) { 943 uid_t uid = 944 (vap->va_uid != (uid_t)VNOVAL) ? vap->va_uid : attr->va_uid; 945 gid_t gid = 946 (vap->va_gid != (gid_t)VNOVAL) ? vap->va_gid : attr->va_gid; 947 error = kauth_authorize_vnode(cred, 948 KAUTH_VNODE_CHANGE_OWNERSHIP, vp, NULL, 949 genfs_can_chown(cred, attr->va_uid, attr->va_gid, uid, 950 gid)); 951 if (error) 952 return error; 953 attr->va_uid = uid; 954 attr->va_gid = gid; 955 } 956 957 if (vap->va_mode != (mode_t)VNOVAL) { 958 mode_t mode = vap->va_mode; 959 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_SECURITY, 960 vp, NULL, genfs_can_chmod(vp->v_type, cred, attr->va_uid, 961 attr->va_gid, mode)); 962 if (error) 963 return error; 964 attr->va_mode = mode; 965 } 966 967 if (vp->v_type == VREG && 968 vap->va_size != VSIZENOTSET && 969 vap->va_size != rn->rn_dlen) { 970 void *newdata; 971 size_t copylen, newlen; 972 973 newlen = vap->va_size; 974 newdata = rump_hypermalloc(newlen, 0, true, "rumpfs"); 975 976 copylen = MIN(rn->rn_dlen, newlen); 977 memset(newdata, 0, newlen); 978 memcpy(newdata, rn->rn_data, copylen); 979 rump_hyperfree(rn->rn_data, rn->rn_dlen); 980 981 rn->rn_data = newdata; 982 rn->rn_dlen = newlen; 983 uvm_vnp_setsize(vp, newlen); 984 } 985 return 0; 986 } 987 988 static int 989 rump_vop_mkdir(void *v) 990 { 991 struct vop_mkdir_args /* { 992 struct vnode *a_dvp; 993 struct vnode **a_vpp; 994 struct componentname *a_cnp; 995 struct vattr *a_vap; 996 }; */ *ap = v; 997 struct vnode *dvp = ap->a_dvp; 998 struct vnode **vpp = ap->a_vpp; 999 struct componentname *cnp = ap->a_cnp; 1000 struct rumpfs_node *rnd = dvp->v_data, *rn; 1001 int rv = 0; 1002 1003 rn = makeprivate(VDIR, NODEV, DEV_BSIZE, false); 1004 if ((cnp->cn_flags & ISWHITEOUT) != 0) 1005 rn->rn_va.va_flags |= UF_OPAQUE; 1006 rn->rn_parent = rnd; 1007 rv = makevnode(dvp->v_mount, rn, vpp); 1008 if (rv) 1009 goto out; 1010 1011 makedir(rnd, cnp, rn); 1012 1013 out: 1014 vput(dvp); 1015 return rv; 1016 } 1017 1018 static int 1019 rump_vop_rmdir(void *v) 1020 { 1021 struct vop_rmdir_args /* { 1022 struct vnode *a_dvp; 1023 struct vnode *a_vp; 1024 struct componentname *a_cnp; 1025 }; */ *ap = v; 1026 struct vnode *dvp = ap->a_dvp; 1027 struct vnode *vp = ap->a_vp; 1028 struct componentname *cnp = ap->a_cnp; 1029 struct rumpfs_node *rnd = dvp->v_data; 1030 struct rumpfs_node *rn = vp->v_data; 1031 struct rumpfs_dent *rd; 1032 int rv = 0; 1033 1034 LIST_FOREACH(rd, &rn->rn_dir, rd_entries) { 1035 if (rd->rd_node != RUMPFS_WHITEOUT) { 1036 rv = ENOTEMPTY; 1037 goto out; 1038 } 1039 } 1040 while ((rd = LIST_FIRST(&rn->rn_dir)) != NULL) { 1041 KASSERT(rd->rd_node == RUMPFS_WHITEOUT); 1042 LIST_REMOVE(rd, rd_entries); 1043 kmem_free(rd->rd_name, rd->rd_namelen+1); 1044 kmem_free(rd, sizeof(*rd)); 1045 } 1046 1047 freedir(rnd, cnp); 1048 rn->rn_flags |= RUMPNODE_CANRECLAIM; 1049 rn->rn_parent = NULL; 1050 1051 out: 1052 vput(dvp); 1053 vput(vp); 1054 1055 return rv; 1056 } 1057 1058 static int 1059 rump_vop_remove(void *v) 1060 { 1061 struct vop_remove_args /* { 1062 struct vnode *a_dvp; 1063 struct vnode *a_vp; 1064 struct componentname *a_cnp; 1065 }; */ *ap = v; 1066 struct vnode *dvp = ap->a_dvp; 1067 struct vnode *vp = ap->a_vp; 1068 struct componentname *cnp = ap->a_cnp; 1069 struct rumpfs_node *rnd = dvp->v_data; 1070 struct rumpfs_node *rn = vp->v_data; 1071 int rv = 0; 1072 1073 if (rn->rn_flags & RUMPNODE_ET_PHONE_HOST) 1074 return EOPNOTSUPP; 1075 1076 if (vp->v_type == VREG) { 1077 rump_hyperfree(rn->rn_data, rn->rn_dlen); 1078 } 1079 1080 freedir(rnd, cnp); 1081 rn->rn_flags |= RUMPNODE_CANRECLAIM; 1082 1083 vput(dvp); 1084 vput(vp); 1085 1086 return rv; 1087 } 1088 1089 static int 1090 rump_vop_mknod(void *v) 1091 { 1092 struct vop_mknod_args /* { 1093 struct vnode *a_dvp; 1094 struct vnode **a_vpp; 1095 struct componentname *a_cnp; 1096 struct vattr *a_vap; 1097 }; */ *ap = v; 1098 struct vnode *dvp = ap->a_dvp; 1099 struct vnode **vpp = ap->a_vpp; 1100 struct componentname *cnp = ap->a_cnp; 1101 struct vattr *va = ap->a_vap; 1102 struct rumpfs_node *rnd = dvp->v_data, *rn; 1103 int rv; 1104 1105 rn = makeprivate(va->va_type, va->va_rdev, DEV_BSIZE, false); 1106 if ((cnp->cn_flags & ISWHITEOUT) != 0) 1107 rn->rn_va.va_flags |= UF_OPAQUE; 1108 rv = makevnode(dvp->v_mount, rn, vpp); 1109 if (rv) 1110 goto out; 1111 1112 makedir(rnd, cnp, rn); 1113 1114 out: 1115 vput(dvp); 1116 return rv; 1117 } 1118 1119 static int 1120 rump_vop_create(void *v) 1121 { 1122 struct vop_create_args /* { 1123 struct vnode *a_dvp; 1124 struct vnode **a_vpp; 1125 struct componentname *a_cnp; 1126 struct vattr *a_vap; 1127 }; */ *ap = v; 1128 struct vnode *dvp = ap->a_dvp; 1129 struct vnode **vpp = ap->a_vpp; 1130 struct componentname *cnp = ap->a_cnp; 1131 struct vattr *va = ap->a_vap; 1132 struct rumpfs_node *rnd = dvp->v_data, *rn; 1133 off_t newsize; 1134 int rv; 1135 1136 newsize = va->va_type == VSOCK ? DEV_BSIZE : 0; 1137 rn = makeprivate(va->va_type, NODEV, newsize, false); 1138 if ((cnp->cn_flags & ISWHITEOUT) != 0) 1139 rn->rn_va.va_flags |= UF_OPAQUE; 1140 rv = makevnode(dvp->v_mount, rn, vpp); 1141 if (rv) 1142 goto out; 1143 1144 makedir(rnd, cnp, rn); 1145 1146 out: 1147 vput(dvp); 1148 return rv; 1149 } 1150 1151 static int 1152 rump_vop_symlink(void *v) 1153 { 1154 struct vop_symlink_args /* { 1155 struct vnode *a_dvp; 1156 struct vnode **a_vpp; 1157 struct componentname *a_cnp; 1158 struct vattr *a_vap; 1159 char *a_target; 1160 }; */ *ap = v; 1161 struct vnode *dvp = ap->a_dvp; 1162 struct vnode **vpp = ap->a_vpp; 1163 struct componentname *cnp = ap->a_cnp; 1164 struct rumpfs_node *rnd = dvp->v_data, *rn; 1165 const char *target = ap->a_target; 1166 size_t linklen; 1167 int rv; 1168 1169 linklen = strlen(target); 1170 KASSERT(linklen < MAXPATHLEN); 1171 rn = makeprivate(VLNK, NODEV, linklen, false); 1172 if ((cnp->cn_flags & ISWHITEOUT) != 0) 1173 rn->rn_va.va_flags |= UF_OPAQUE; 1174 rv = makevnode(dvp->v_mount, rn, vpp); 1175 if (rv) 1176 goto out; 1177 1178 makedir(rnd, cnp, rn); 1179 1180 KASSERT(linklen < MAXPATHLEN); 1181 rn->rn_linktarg = PNBUF_GET(); 1182 rn->rn_linklen = linklen; 1183 strcpy(rn->rn_linktarg, target); 1184 1185 out: 1186 vput(dvp); 1187 return rv; 1188 } 1189 1190 static int 1191 rump_vop_readlink(void *v) 1192 { 1193 struct vop_readlink_args /* { 1194 struct vnode *a_vp; 1195 struct uio *a_uio; 1196 kauth_cred_t a_cred; 1197 }; */ *ap = v; 1198 struct vnode *vp = ap->a_vp; 1199 struct rumpfs_node *rn = vp->v_data; 1200 struct uio *uio = ap->a_uio; 1201 1202 return uiomove(rn->rn_linktarg, rn->rn_linklen, uio); 1203 } 1204 1205 static int 1206 rump_vop_whiteout(void *v) 1207 { 1208 struct vop_whiteout_args /* { 1209 struct vnode *a_dvp; 1210 struct componentname *a_cnp; 1211 int a_flags; 1212 } */ *ap = v; 1213 struct vnode *dvp = ap->a_dvp; 1214 struct rumpfs_node *rnd = dvp->v_data; 1215 struct componentname *cnp = ap->a_cnp; 1216 int flags = ap->a_flags; 1217 1218 switch (flags) { 1219 case LOOKUP: 1220 break; 1221 case CREATE: 1222 makedir(rnd, cnp, RUMPFS_WHITEOUT); 1223 break; 1224 case DELETE: 1225 cnp->cn_flags &= ~DOWHITEOUT; /* cargo culting never fails ? */ 1226 freedir(rnd, cnp); 1227 break; 1228 default: 1229 panic("unknown whiteout op %d", flags); 1230 } 1231 1232 return 0; 1233 } 1234 1235 static int 1236 rump_vop_open(void *v) 1237 { 1238 struct vop_open_args /* { 1239 struct vnode *a_vp; 1240 int a_mode; 1241 kauth_cred_t a_cred; 1242 } */ *ap = v; 1243 struct vnode *vp = ap->a_vp; 1244 struct rumpfs_node *rn = vp->v_data; 1245 int mode = ap->a_mode; 1246 int error = EINVAL; 1247 1248 if (vp->v_type != VREG || (rn->rn_flags & RUMPNODE_ET_PHONE_HOST) == 0) 1249 return 0; 1250 1251 if (mode & FREAD) { 1252 if (rn->rn_readfd != -1) 1253 return 0; 1254 rn->rn_readfd = rumpuser_open(rn->rn_hostpath, 1255 RUMPUSER_OPEN_RDONLY, &error); 1256 } 1257 1258 if (mode & FWRITE) { 1259 if (rn->rn_writefd != -1) 1260 return 0; 1261 rn->rn_writefd = rumpuser_open(rn->rn_hostpath, 1262 RUMPUSER_OPEN_WRONLY, &error); 1263 } 1264 1265 return error; 1266 } 1267 1268 /* simple readdir. event omits dotstuff and periods */ 1269 static int 1270 rump_vop_readdir(void *v) 1271 { 1272 struct vop_readdir_args /* { 1273 struct vnode *a_vp; 1274 struct uio *a_uio; 1275 kauth_cred_t a_cred; 1276 int *a_eofflag; 1277 off_t **a_cookies; 1278 int *a_ncookies; 1279 } */ *ap = v; 1280 struct vnode *vp = ap->a_vp; 1281 struct uio *uio = ap->a_uio; 1282 struct rumpfs_node *rnd = vp->v_data; 1283 struct rumpfs_dent *rdent; 1284 unsigned i; 1285 int rv = 0; 1286 1287 /* seek to current entry */ 1288 for (i = 0, rdent = LIST_FIRST(&rnd->rn_dir); 1289 (i < uio->uio_offset) && rdent; 1290 i++, rdent = LIST_NEXT(rdent, rd_entries)) 1291 continue; 1292 if (!rdent) 1293 goto out; 1294 1295 /* copy entries */ 1296 for (; rdent && uio->uio_resid > 0; 1297 rdent = LIST_NEXT(rdent, rd_entries), i++) { 1298 struct dirent dent; 1299 1300 strlcpy(dent.d_name, rdent->rd_name, sizeof(dent.d_name)); 1301 dent.d_namlen = strlen(dent.d_name); 1302 dent.d_reclen = _DIRENT_RECLEN(&dent, dent.d_namlen); 1303 1304 if (__predict_false(RDENT_ISWHITEOUT(rdent))) { 1305 dent.d_fileno = INO_WHITEOUT; 1306 dent.d_type = DT_WHT; 1307 } else { 1308 dent.d_fileno = rdent->rd_node->rn_va.va_fileid; 1309 dent.d_type = vtype2dt(rdent->rd_node->rn_va.va_type); 1310 } 1311 1312 if (uio->uio_resid < dent.d_reclen) { 1313 i--; 1314 break; 1315 } 1316 1317 rv = uiomove(&dent, dent.d_reclen, uio); 1318 if (rv) { 1319 i--; 1320 break; 1321 } 1322 } 1323 1324 out: 1325 if (ap->a_cookies) { 1326 *ap->a_ncookies = 0; 1327 *ap->a_cookies = NULL; 1328 } 1329 if (rdent) 1330 *ap->a_eofflag = 0; 1331 else 1332 *ap->a_eofflag = 1; 1333 uio->uio_offset = i; 1334 1335 return rv; 1336 } 1337 1338 static int 1339 etread(struct rumpfs_node *rn, struct uio *uio) 1340 { 1341 uint8_t *buf; 1342 size_t bufsize; 1343 ssize_t n; 1344 int error = 0; 1345 1346 bufsize = uio->uio_resid; 1347 if (bufsize == 0) 1348 return 0; 1349 buf = kmem_alloc(bufsize, KM_SLEEP); 1350 if ((n = rumpuser_pread(rn->rn_readfd, buf, bufsize, 1351 uio->uio_offset + rn->rn_offset, &error)) == -1) 1352 goto out; 1353 KASSERT(n <= bufsize); 1354 error = uiomove(buf, n, uio); 1355 1356 out: 1357 kmem_free(buf, bufsize); 1358 return error; 1359 1360 } 1361 1362 static int 1363 rump_vop_read(void *v) 1364 { 1365 struct vop_read_args /* { 1366 struct vnode *a_vp; 1367 struct uio *a_uio; 1368 int ioflags a_ioflag; 1369 kauth_cred_t a_cred; 1370 }; */ *ap = v; 1371 struct vnode *vp = ap->a_vp; 1372 struct rumpfs_node *rn = vp->v_data; 1373 struct uio *uio = ap->a_uio; 1374 const int advice = IO_ADV_DECODE(ap->a_ioflag); 1375 off_t chunk; 1376 int error = 0; 1377 1378 if (vp->v_type == VDIR) 1379 return EISDIR; 1380 1381 /* et op? */ 1382 if (rn->rn_flags & RUMPNODE_ET_PHONE_HOST) 1383 return etread(rn, uio); 1384 1385 /* otherwise, it's off to ubc with us */ 1386 while (uio->uio_resid > 0) { 1387 chunk = MIN(uio->uio_resid, (off_t)rn->rn_dlen-uio->uio_offset); 1388 if (chunk == 0) 1389 break; 1390 error = ubc_uiomove(&vp->v_uobj, uio, chunk, advice, 1391 UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp)); 1392 if (error) 1393 break; 1394 } 1395 1396 return error; 1397 } 1398 1399 static int 1400 etwrite(struct rumpfs_node *rn, struct uio *uio) 1401 { 1402 uint8_t *buf; 1403 size_t bufsize; 1404 ssize_t n; 1405 int error = 0; 1406 1407 bufsize = uio->uio_resid; 1408 if (bufsize == 0) 1409 return 0; 1410 buf = kmem_alloc(bufsize, KM_SLEEP); 1411 error = uiomove(buf, bufsize, uio); 1412 if (error) 1413 goto out; 1414 KASSERT(uio->uio_resid == 0); 1415 n = rumpuser_pwrite(rn->rn_writefd, buf, bufsize, 1416 (uio->uio_offset-bufsize) + rn->rn_offset, &error); 1417 if (n >= 0) { 1418 KASSERT(n <= bufsize); 1419 uio->uio_resid = bufsize - n; 1420 } 1421 1422 out: 1423 kmem_free(buf, bufsize); 1424 return error; 1425 } 1426 1427 static int 1428 rump_vop_write(void *v) 1429 { 1430 struct vop_write_args /* { 1431 struct vnode *a_vp; 1432 struct uio *a_uio; 1433 int ioflags a_ioflag; 1434 kauth_cred_t a_cred; 1435 }; */ *ap = v; 1436 struct vnode *vp = ap->a_vp; 1437 struct rumpfs_node *rn = vp->v_data; 1438 struct uio *uio = ap->a_uio; 1439 const int advice = IO_ADV_DECODE(ap->a_ioflag); 1440 void *olddata; 1441 size_t oldlen, newlen; 1442 off_t chunk; 1443 int error = 0; 1444 bool allocd = false; 1445 1446 if (ap->a_ioflag & IO_APPEND) 1447 uio->uio_offset = vp->v_size; 1448 1449 /* consult et? */ 1450 if (rn->rn_flags & RUMPNODE_ET_PHONE_HOST) 1451 return etwrite(rn, uio); 1452 1453 /* 1454 * Otherwise, it's a case of ubcmove. 1455 */ 1456 1457 /* 1458 * First, make sure we have enough storage. 1459 * 1460 * No, you don't need to tell me it's not very efficient. 1461 * No, it doesn't really support sparse files, just fakes it. 1462 */ 1463 newlen = uio->uio_offset + uio->uio_resid; 1464 oldlen = 0; /* XXXgcc */ 1465 olddata = NULL; 1466 if (rn->rn_dlen < newlen) { 1467 oldlen = rn->rn_dlen; 1468 olddata = rn->rn_data; 1469 1470 rn->rn_data = rump_hypermalloc(newlen, 0, true, "rumpfs"); 1471 rn->rn_dlen = newlen; 1472 memset(rn->rn_data, 0, newlen); 1473 memcpy(rn->rn_data, olddata, oldlen); 1474 allocd = true; 1475 uvm_vnp_setsize(vp, newlen); 1476 } 1477 1478 /* ok, we have enough stooorage. write */ 1479 while (uio->uio_resid > 0) { 1480 chunk = MIN(uio->uio_resid, (off_t)rn->rn_dlen-uio->uio_offset); 1481 if (chunk == 0) 1482 break; 1483 error = ubc_uiomove(&vp->v_uobj, uio, chunk, advice, 1484 UBC_WRITE | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp)); 1485 if (error) 1486 break; 1487 } 1488 1489 if (allocd) { 1490 if (error) { 1491 rump_hyperfree(rn->rn_data, newlen); 1492 rn->rn_data = olddata; 1493 rn->rn_dlen = oldlen; 1494 uvm_vnp_setsize(vp, oldlen); 1495 } else { 1496 rump_hyperfree(olddata, oldlen); 1497 } 1498 } 1499 1500 return error; 1501 } 1502 1503 static int 1504 rump_vop_bmap(void *v) 1505 { 1506 struct vop_bmap_args /* { 1507 struct vnode *a_vp; 1508 daddr_t a_bn; 1509 struct vnode **a_vpp; 1510 daddr_t *a_bnp; 1511 int *a_runp; 1512 } */ *ap = v; 1513 1514 /* 1:1 mapping */ 1515 if (ap->a_vpp) 1516 *ap->a_vpp = ap->a_vp; 1517 if (ap->a_bnp) 1518 *ap->a_bnp = ap->a_bn; 1519 if (ap->a_runp) 1520 *ap->a_runp = 16; 1521 1522 return 0; 1523 } 1524 1525 static int 1526 rump_vop_strategy(void *v) 1527 { 1528 struct vop_strategy_args /* { 1529 struct vnode *a_vp; 1530 struct buf *a_bp; 1531 } */ *ap = v; 1532 struct vnode *vp = ap->a_vp; 1533 struct rumpfs_node *rn = vp->v_data; 1534 struct buf *bp = ap->a_bp; 1535 off_t copylen, copyoff; 1536 int error; 1537 1538 if (vp->v_type != VREG || rn->rn_flags & RUMPNODE_ET_PHONE_HOST) { 1539 error = EINVAL; 1540 goto out; 1541 } 1542 1543 copyoff = bp->b_blkno << DEV_BSHIFT; 1544 copylen = MIN(rn->rn_dlen - copyoff, bp->b_bcount); 1545 if (BUF_ISWRITE(bp)) { 1546 memcpy((uint8_t *)rn->rn_data + copyoff, bp->b_data, copylen); 1547 } else { 1548 memset((uint8_t*)bp->b_data + copylen, 0, bp->b_bcount-copylen); 1549 memcpy(bp->b_data, (uint8_t *)rn->rn_data + copyoff, copylen); 1550 } 1551 bp->b_resid = 0; 1552 error = 0; 1553 1554 out: 1555 bp->b_error = error; 1556 biodone(bp); 1557 return 0; 1558 } 1559 1560 static int 1561 rump_vop_pathconf(void *v) 1562 { 1563 struct vop_pathconf_args /* { 1564 struct vnode *a_vp; 1565 int a_name; 1566 register_t *a_retval; 1567 }; */ *ap = v; 1568 int name = ap->a_name; 1569 register_t *retval = ap->a_retval; 1570 1571 switch (name) { 1572 case _PC_LINK_MAX: 1573 *retval = LINK_MAX; 1574 return 0; 1575 case _PC_NAME_MAX: 1576 *retval = RUMPFS_MAXNAMLEN; 1577 return 0; 1578 case _PC_PATH_MAX: 1579 *retval = PATH_MAX; 1580 return 0; 1581 case _PC_PIPE_BUF: 1582 *retval = PIPE_BUF; 1583 return 0; 1584 case _PC_CHOWN_RESTRICTED: 1585 *retval = 1; 1586 return 0; 1587 case _PC_NO_TRUNC: 1588 *retval = 1; 1589 return 0; 1590 case _PC_SYNC_IO: 1591 *retval = 1; 1592 return 0; 1593 case _PC_FILESIZEBITS: 1594 *retval = 43; /* this one goes to 11 */ 1595 return 0; 1596 case _PC_SYMLINK_MAX: 1597 *retval = MAXPATHLEN; 1598 return 0; 1599 case _PC_2_SYMLINKS: 1600 *retval = 1; 1601 return 0; 1602 default: 1603 return EINVAL; 1604 } 1605 } 1606 1607 static int 1608 rump_vop_success(void *v) 1609 { 1610 1611 return 0; 1612 } 1613 1614 static int 1615 rump_vop_inactive(void *v) 1616 { 1617 struct vop_inactive_args /* { 1618 struct vnode *a_vp; 1619 bool *a_recycle; 1620 } */ *ap = v; 1621 struct vnode *vp = ap->a_vp; 1622 struct rumpfs_node *rn = vp->v_data; 1623 int error; 1624 1625 if (rn->rn_flags & RUMPNODE_ET_PHONE_HOST && vp->v_type == VREG) { 1626 if (rn->rn_readfd != -1) { 1627 rumpuser_close(rn->rn_readfd, &error); 1628 rn->rn_readfd = -1; 1629 } 1630 if (rn->rn_writefd != -1) { 1631 rumpuser_close(rn->rn_writefd, &error); 1632 rn->rn_writefd = -1; 1633 } 1634 } 1635 *ap->a_recycle = (rn->rn_flags & RUMPNODE_CANRECLAIM) ? true : false; 1636 1637 VOP_UNLOCK(vp); 1638 return 0; 1639 } 1640 1641 static int 1642 rump_vop_reclaim(void *v) 1643 { 1644 struct vop_reclaim_args /* { 1645 struct vnode *a_vp; 1646 } */ *ap = v; 1647 struct vnode *vp = ap->a_vp; 1648 struct rumpfs_node *rn = vp->v_data; 1649 1650 mutex_enter(&reclock); 1651 rn->rn_vp = NULL; 1652 mutex_exit(&reclock); 1653 genfs_node_destroy(vp); 1654 vp->v_data = NULL; 1655 1656 if (rn->rn_flags & RUMPNODE_CANRECLAIM) { 1657 if (vp->v_type == VLNK) 1658 PNBUF_PUT(rn->rn_linktarg); 1659 if (rn->rn_hostpath) 1660 free(rn->rn_hostpath, M_TEMP); 1661 kmem_free(rn, sizeof(*rn)); 1662 } 1663 1664 return 0; 1665 } 1666 1667 static int 1668 rump_vop_spec(void *v) 1669 { 1670 struct vop_generic_args *ap = v; 1671 int (**opvec)(void *); 1672 1673 switch (ap->a_desc->vdesc_offset) { 1674 case VOP_ACCESS_DESCOFFSET: 1675 case VOP_GETATTR_DESCOFFSET: 1676 case VOP_SETATTR_DESCOFFSET: 1677 case VOP_LOCK_DESCOFFSET: 1678 case VOP_UNLOCK_DESCOFFSET: 1679 case VOP_ISLOCKED_DESCOFFSET: 1680 case VOP_RECLAIM_DESCOFFSET: 1681 opvec = rump_vnodeop_p; 1682 break; 1683 default: 1684 opvec = spec_vnodeop_p; 1685 break; 1686 } 1687 1688 return VOCALL(opvec, ap->a_desc->vdesc_offset, v); 1689 } 1690 1691 static int 1692 rump_vop_advlock(void *v) 1693 { 1694 struct vop_advlock_args /* { 1695 const struct vnodeop_desc *a_desc; 1696 struct vnode *a_vp; 1697 void *a_id; 1698 int a_op; 1699 struct flock *a_fl; 1700 int a_flags; 1701 } */ *ap = v; 1702 struct vnode *vp = ap->a_vp; 1703 struct rumpfs_node *rn = vp->v_data; 1704 1705 return lf_advlock(ap, &rn->rn_lockf, vp->v_size); 1706 } 1707 1708 /* 1709 * Begin vfs-level stuff 1710 */ 1711 1712 VFS_PROTOS(rumpfs); 1713 struct vfsops rumpfs_vfsops = { 1714 .vfs_name = MOUNT_RUMPFS, 1715 .vfs_min_mount_data = 0, 1716 .vfs_mount = rumpfs_mount, 1717 .vfs_start = (void *)nullop, 1718 .vfs_unmount = rumpfs_unmount, 1719 .vfs_root = rumpfs_root, 1720 .vfs_quotactl = (void *)eopnotsupp, 1721 .vfs_statvfs = genfs_statvfs, 1722 .vfs_sync = (void *)nullop, 1723 .vfs_vget = rumpfs_vget, 1724 .vfs_fhtovp = (void *)eopnotsupp, 1725 .vfs_vptofh = (void *)eopnotsupp, 1726 .vfs_init = rumpfs_init, 1727 .vfs_reinit = NULL, 1728 .vfs_done = rumpfs_done, 1729 .vfs_mountroot = rumpfs_mountroot, 1730 .vfs_snapshot = (void *)eopnotsupp, 1731 .vfs_extattrctl = (void *)eopnotsupp, 1732 .vfs_suspendctl = (void *)eopnotsupp, 1733 .vfs_renamelock_enter = genfs_renamelock_enter, 1734 .vfs_renamelock_exit = genfs_renamelock_exit, 1735 .vfs_opv_descs = rump_opv_descs, 1736 /* vfs_refcount */ 1737 /* vfs_list */ 1738 }; 1739 1740 static int 1741 rumpfs_mountfs(struct mount *mp) 1742 { 1743 struct rumpfs_mount *rfsmp; 1744 struct rumpfs_node *rn; 1745 int error; 1746 1747 rfsmp = kmem_alloc(sizeof(*rfsmp), KM_SLEEP); 1748 1749 rn = makeprivate(VDIR, NODEV, DEV_BSIZE, false); 1750 rn->rn_parent = rn; 1751 if ((error = makevnode(mp, rn, &rfsmp->rfsmp_rvp)) != 0) 1752 return error; 1753 1754 rfsmp->rfsmp_rvp->v_vflag |= VV_ROOT; 1755 VOP_UNLOCK(rfsmp->rfsmp_rvp); 1756 1757 mp->mnt_data = rfsmp; 1758 mp->mnt_stat.f_namemax = RUMPFS_MAXNAMLEN; 1759 mp->mnt_stat.f_iosize = 512; 1760 mp->mnt_flag |= MNT_LOCAL; 1761 mp->mnt_iflag |= IMNT_MPSAFE | IMNT_CAN_RWTORO; 1762 mp->mnt_fs_bshift = DEV_BSHIFT; 1763 vfs_getnewfsid(mp); 1764 1765 return 0; 1766 } 1767 1768 int 1769 rumpfs_mount(struct mount *mp, const char *mntpath, void *arg, size_t *alen) 1770 { 1771 int error; 1772 1773 if (mp->mnt_flag & MNT_UPDATE) { 1774 return 0; 1775 } 1776 1777 error = set_statvfs_info(mntpath, UIO_USERSPACE, "rumpfs", UIO_SYSSPACE, 1778 mp->mnt_op->vfs_name, mp, curlwp); 1779 if (error) 1780 return error; 1781 1782 return rumpfs_mountfs(mp); 1783 } 1784 1785 int 1786 rumpfs_unmount(struct mount *mp, int mntflags) 1787 { 1788 struct rumpfs_mount *rfsmp = mp->mnt_data; 1789 int flags = 0, error; 1790 1791 if (panicstr || mntflags & MNT_FORCE) 1792 flags |= FORCECLOSE; 1793 1794 if ((error = vflush(mp, rfsmp->rfsmp_rvp, flags)) != 0) 1795 return error; 1796 vgone(rfsmp->rfsmp_rvp); /* XXX */ 1797 1798 kmem_free(rfsmp, sizeof(*rfsmp)); 1799 1800 return 0; 1801 } 1802 1803 int 1804 rumpfs_root(struct mount *mp, struct vnode **vpp) 1805 { 1806 struct rumpfs_mount *rfsmp = mp->mnt_data; 1807 1808 vref(rfsmp->rfsmp_rvp); 1809 vn_lock(rfsmp->rfsmp_rvp, LK_EXCLUSIVE | LK_RETRY); 1810 *vpp = rfsmp->rfsmp_rvp; 1811 return 0; 1812 } 1813 1814 int 1815 rumpfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 1816 { 1817 1818 return EOPNOTSUPP; 1819 } 1820 1821 void 1822 rumpfs_init() 1823 { 1824 1825 CTASSERT(RUMP_ETFS_SIZE_ENDOFF == RUMPBLK_SIZENOTSET); 1826 1827 mutex_init(&reclock, MUTEX_DEFAULT, IPL_NONE); 1828 mutex_init(&etfs_lock, MUTEX_DEFAULT, IPL_NONE); 1829 } 1830 1831 void 1832 rumpfs_done() 1833 { 1834 1835 mutex_destroy(&reclock); 1836 mutex_destroy(&etfs_lock); 1837 } 1838 1839 int 1840 rumpfs_mountroot() 1841 { 1842 struct mount *mp; 1843 int error; 1844 1845 if ((error = vfs_rootmountalloc(MOUNT_RUMPFS, "rootdev", &mp)) != 0) { 1846 vrele(rootvp); 1847 return error; 1848 } 1849 1850 if ((error = rumpfs_mountfs(mp)) != 0) 1851 panic("mounting rootfs failed: %d", error); 1852 1853 mutex_enter(&mountlist_lock); 1854 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 1855 mutex_exit(&mountlist_lock); 1856 1857 error = set_statvfs_info("/", UIO_SYSSPACE, "rumpfs", UIO_SYSSPACE, 1858 mp->mnt_op->vfs_name, mp, curlwp); 1859 if (error) 1860 panic("set_statvfs_info failed for rootfs: %d", error); 1861 1862 mp->mnt_flag &= ~MNT_RDONLY; 1863 vfs_unbusy(mp, false, NULL); 1864 1865 return 0; 1866 } 1867
Indexes created Mon Sep 29 21:09:56 GMT 2025