1/* $NetBSD: puffs_vfsops.c,v 1.126 2021/04/01 19:00:33 christos Exp $ */ 2 3/* 4 * Copyright (c) 2005, 2006 Antti Kantee. All Rights Reserved. 5 * 6 * Development of this software was supported by the 7 * Google Summer of Code program and the Ulla Tuominen Foundation. 8 * The Google SoC project was mentored by Bill Studenmund. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 20 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 22 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 25 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32#include <sys/cdefs.h> 33__KERNEL_RCSID(0, "$NetBSD: puffs_vfsops.c,v 1.126 2021/04/01 19:00:33 christos Exp $"); 34 35#include <sys/param.h> 36#include <sys/kernel.h> 37#include <sys/mount.h> 38#include <sys/extattr.h> 39#include <sys/queue.h> 40#include <sys/vnode.h> 41#include <sys/dirent.h> 42#include <sys/kauth.h> 43#include <sys/proc.h> 44#include <sys/module.h> 45#include <sys/kthread.h> 46 47#include <uvm/uvm.h> 48 49#include <dev/putter/putter_sys.h> 50 51#include <miscfs/genfs/genfs.h> 52 53#include <fs/puffs/puffs_msgif.h> 54#include <fs/puffs/puffs_sys.h> 55 56#include <lib/libkern/libkern.h> 57 58#include <nfs/nfsproto.h> /* for fh sizes */ 59 60MODULE(MODULE_CLASS_VFS, puffs, "putter"); 61 62VFS_PROTOS(puffs_vfsop); 63 64static struct putter_ops puffs_putter = { 65 .pop_getout = puffs_msgif_getout, 66 .pop_releaseout = puffs_msgif_releaseout, 67 .pop_waitcount = puffs_msgif_waitcount, 68 .pop_dispatch = puffs_msgif_dispatch, 69 .pop_close = puffs_msgif_close, 70}; 71 72static const struct genfs_ops puffs_genfsops = { 73 .gop_size = puffs_gop_size, 74 .gop_write = genfs_gop_write, 75 .gop_markupdate = puffs_gop_markupdate, 76#if 0 77 .gop_alloc, should ask userspace 78#endif 79 .gop_putrange = genfs_gop_putrange, 80}; 81 82/* 83 * Try to ensure data structures used by the puffs protocol 84 * do not unexpectedly change. 85 */ 86#if defined(__i386__) && defined(__ELF__) 87CTASSERT(sizeof(struct puffs_kargs) == 3928); 88CTASSERT(sizeof(struct vattr) == 136); 89CTASSERT(sizeof(struct puffs_req) == 44); 90#endif 91 92int 93puffs_vfsop_mount(struct mount *mp, const char *path, void *data, 94 size_t *data_len) 95{ 96 struct puffs_mount *pmp = NULL; 97 struct puffs_kargs *args; 98 char fstype[_VFS_NAMELEN]; 99 char *p; 100 int error = 0, i; 101 pid_t mntpid = curlwp->l_proc->p_pid; 102 103 if (data == NULL) 104 return EINVAL; 105 if (*data_len < sizeof *args) 106 return EINVAL; 107 108 if (mp->mnt_flag & MNT_GETARGS) { 109 pmp = MPTOPUFFSMP(mp); 110 *(struct puffs_kargs *)data = pmp->pmp_args; 111 *data_len = sizeof *args; 112 return 0; 113 } 114 115 /* update is not supported currently */ 116 if (mp->mnt_flag & MNT_UPDATE) 117 return EOPNOTSUPP; 118 119 args = (struct puffs_kargs *)data; 120 121 if (args->pa_vers != PUFFSVERSION) { 122 printf("puffs_mount: development version mismatch: " 123 "kernel %d, lib %d\n", PUFFSVERSION, args->pa_vers); 124 error = EINVAL; 125 goto out; 126 } 127 128 if ((args->pa_flags & ~PUFFS_KFLAG_MASK) != 0) { 129 printf("puffs_mount: invalid KFLAGs 0x%x\n", args->pa_flags); 130 error = EINVAL; 131 goto out; 132 } 133 if ((args->pa_fhflags & ~PUFFS_FHFLAG_MASK) != 0) { 134 printf("puffs_mount: invalid FHFLAGs 0x%x\n", args->pa_fhflags); 135 error = EINVAL; 136 goto out; 137 } 138 139 for (i = 0; i < __arraycount(args->pa_spare); i++) { 140 if (args->pa_spare[i] != 0) { 141 printf("puffs_mount: pa_spare[%d] = 0x%x\n", 142 i, args->pa_spare[i]); 143 error = EINVAL; 144 goto out; 145 } 146 } 147 148 /* use dummy value for passthrough */ 149 if (args->pa_fhflags & PUFFS_FHFLAG_PASSTHROUGH) 150 args->pa_fhsize = sizeof(struct fid); 151 152 /* sanitize file handle length */ 153 if (PUFFS_TOFHSIZE(args->pa_fhsize) > FHANDLE_SIZE_MAX) { 154 printf("puffs_mount: handle size %zu too large\n", 155 args->pa_fhsize); 156 error = EINVAL; 157 goto out; 158 } 159 /* sanity check file handle max sizes */ 160 if (args->pa_fhsize && args->pa_fhflags & PUFFS_FHFLAG_PROTOMASK) { 161 size_t kfhsize = PUFFS_TOFHSIZE(args->pa_fhsize); 162 163 if (args->pa_fhflags & PUFFS_FHFLAG_NFSV2) { 164 if (NFSX_FHTOOBIG_P(kfhsize, 0)) { 165 printf("puffs_mount: fhsize larger than " 166 "NFSv2 max %d\n", 167 PUFFS_FROMFHSIZE(NFSX_V2FH)); 168 error = EINVAL; 169 goto out; 170 } 171 } 172 173 if (args->pa_fhflags & PUFFS_FHFLAG_NFSV3) { 174 if (NFSX_FHTOOBIG_P(kfhsize, 1)) { 175 printf("puffs_mount: fhsize larger than " 176 "NFSv3 max %d\n", 177 PUFFS_FROMFHSIZE(NFSX_V3FHMAX)); 178 error = EINVAL; 179 goto out; 180 } 181 } 182 } 183 184 /* don't allow non-printing characters (like my sweet umlauts.. snif) */ 185 args->pa_typename[sizeof(args->pa_typename)-1] = '\0'; 186 for (p = args->pa_typename; *p; p++) 187 if (*p < ' ' || *p > '~') 188 *p = '.'; 189 190 args->pa_mntfromname[sizeof(args->pa_mntfromname)-1] = '\0'; 191 for (p = args->pa_mntfromname; *p; p++) 192 if (*p < ' ' || *p > '~') 193 *p = '.'; 194 195 /* build real name */ 196 (void)strlcpy(fstype, PUFFS_TYPEPREFIX, sizeof(fstype)); 197 (void)strlcat(fstype, args->pa_typename, sizeof(fstype)); 198 199 /* inform user server if it got the max request size it wanted */ 200 if (args->pa_maxmsglen == 0 || args->pa_maxmsglen > PUFFS_MSG_MAXSIZE) 201 args->pa_maxmsglen = PUFFS_MSG_MAXSIZE; 202 else if (args->pa_maxmsglen < 2*PUFFS_MSGSTRUCT_MAX) 203 args->pa_maxmsglen = 2*PUFFS_MSGSTRUCT_MAX; 204 205 (void)strlcpy(args->pa_typename, fstype, sizeof(args->pa_typename)); 206 207 error = set_statvfs_info(path, UIO_USERSPACE, args->pa_mntfromname, 208 UIO_SYSSPACE, fstype, mp, curlwp); 209 if (error) 210 goto out; 211 mp->mnt_stat.f_iosize = DEV_BSIZE; 212 mp->mnt_stat.f_namemax = args->pa_svfsb.f_namemax; 213 214 /* 215 * We can't handle the VFS_STATVFS() mount_domount() does 216 * after VFS_MOUNT() because we'd deadlock, so handle it 217 * here already. 218 */ 219 struct statvfs *sb = STATVFSBUF_GET(); 220 puffs_statvfs_to_statvfs(&args->pa_svfsb, sb); 221 copy_statvfs_info(sb, mp); 222 STATVFSBUF_PUT(sb); 223 224 statvfs_to_puffs_statvfs(&mp->mnt_stat, &args->pa_svfsb); 225 226 KASSERT(curlwp != uvm.pagedaemon_lwp); 227 pmp = kmem_zalloc(sizeof(struct puffs_mount), KM_SLEEP); 228 229 mp->mnt_fs_bshift = DEV_BSHIFT; 230 mp->mnt_dev_bshift = DEV_BSHIFT; 231 mp->mnt_flag &= ~MNT_LOCAL; /* we don't really know, so ... */ 232 mp->mnt_data = pmp; 233 234#if 0 235 /* 236 * XXX: puffs code is MPSAFE. However, VFS really isn't. 237 * Currently, there is nothing which protects an inode from 238 * reclaim while there are threads inside the file system. 239 * This means that in the event of a server crash, an MPSAFE 240 * mount is likely to end up accessing invalid memory. For the 241 * non-mpsafe case, the kernel lock, general structure of 242 * puffs and pmp_refcount protect the threads during escape. 243 * 244 * Fixing this will require: 245 * a) fixing vfs 246 * OR 247 * b) adding a small sleep to puffs_msgif_close() between 248 * userdead() and dounmount(). 249 * (well, this isn't really a fix, but would solve 250 * 99.999% of the race conditions). 251 * 252 * Also, in the event of "b", unmount -f should be used, 253 * like with any other file system, sparingly and only when 254 * it is "known" to be safe. 255 */ 256 mp->mnt_iflags |= IMNT_MPSAFE; 257#endif 258 259 pmp->pmp_status = PUFFSTAT_MOUNTING; 260 pmp->pmp_mp = mp; 261 pmp->pmp_msg_maxsize = args->pa_maxmsglen; 262 pmp->pmp_args = *args; 263 264 /* 265 * Inform the fileops processing code that we have a mountpoint. 266 * If it doesn't know about anyone with our pid/fd having the 267 * device open, punt 268 */ 269 if ((pmp->pmp_pi 270 = putter_attach(mntpid, args->pa_fd, pmp, &puffs_putter)) == NULL) { 271 error = ENOENT; 272 goto out; 273 } 274 275 /* XXX: check parameters */ 276 pmp->pmp_root_cookie = args->pa_root_cookie; 277 switch (args->pa_root_vtype) { 278 case VNON: case VREG: case VDIR: case VBLK: 279 case VCHR: case VLNK: case VSOCK: case VFIFO: 280 break; 281 default: 282 error = EINVAL; 283 goto out; 284 } 285 pmp->pmp_root_vtype = args->pa_root_vtype; 286 287 if (args->pa_root_vsize < 0) { 288 error = EINVAL; 289 goto out; 290 } 291 pmp->pmp_root_vsize = args->pa_root_vsize; 292 293 pmp->pmp_root_rdev = args->pa_root_rdev; 294 pmp->pmp_docompat = args->pa_time32; 295 296 mutex_init(&pmp->pmp_lock, MUTEX_DEFAULT, IPL_NONE); 297 mutex_init(&pmp->pmp_sopmtx, MUTEX_DEFAULT, IPL_NONE); 298 cv_init(&pmp->pmp_msg_waiter_cv, "puffsget"); 299 cv_init(&pmp->pmp_refcount_cv, "puffsref"); 300 cv_init(&pmp->pmp_unmounting_cv, "puffsum"); 301 cv_init(&pmp->pmp_sopcv, "puffsop"); 302 TAILQ_INIT(&pmp->pmp_msg_touser); 303 TAILQ_INIT(&pmp->pmp_msg_replywait); 304 TAILQ_INIT(&pmp->pmp_sopfastreqs); 305 TAILQ_INIT(&pmp->pmp_sopnodereqs); 306 307 if ((error = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL, 308 puffs_sop_thread, pmp, NULL, "puffsop")) != 0) 309 goto out; 310 pmp->pmp_sopthrcount = 1; 311 312 DPRINTF(("puffs_mount: mount point at %p, puffs specific at %p\n", 313 mp, MPTOPUFFSMP(mp))); 314 315 vfs_getnewfsid(mp); 316 317 out: 318 if (error && pmp && pmp->pmp_pi) 319 putter_detach(pmp->pmp_pi); 320 if (error && pmp) 321 kmem_free(pmp, sizeof(struct puffs_mount)); 322 return error; 323} 324 325int 326puffs_vfsop_start(struct mount *mp, int flags) 327{ 328 struct puffs_mount *pmp = MPTOPUFFSMP(mp); 329 330 KASSERT(pmp->pmp_status == PUFFSTAT_MOUNTING); 331 pmp->pmp_status = PUFFSTAT_RUNNING; 332 333 return 0; 334} 335 336int 337puffs_vfsop_unmount(struct mount *mp, int mntflags) 338{ 339 PUFFS_MSG_VARS(vfs, unmount); 340 struct puffs_mount *pmp; 341 int error, force; 342 343 error = 0; 344 force = mntflags & MNT_FORCE; 345 pmp = MPTOPUFFSMP(mp); 346 347 DPRINTF(("puffs_unmount: detach filesystem from vfs, current " 348 "status 0x%x\n", pmp->pmp_status)); 349 350 /* 351 * flush all the vnodes. VOP_RECLAIM() takes care that the 352 * root vnode does not get flushed until unmount. The 353 * userspace root node cookie is stored in the mount 354 * structure, so we can always re-instantiate a root vnode, 355 * should userspace unmount decide it doesn't want to 356 * cooperate. 357 */ 358 error = vflush(mp, NULLVP, force ? FORCECLOSE : 0); 359 if (error) 360 goto out; 361 362 /* 363 * If we are not DYING, we should ask userspace's opinion 364 * about the situation 365 */ 366 mutex_enter(&pmp->pmp_lock); 367 if (pmp->pmp_status != PUFFSTAT_DYING) { 368 pmp->pmp_unmounting = 1; 369 mutex_exit(&pmp->pmp_lock); 370 371 PUFFS_MSG_ALLOC(vfs, unmount); 372 puffs_msg_setinfo(park_unmount, 373 PUFFSOP_VFS, PUFFS_VFS_UNMOUNT, NULL); 374 unmount_msg->pvfsr_flags = mntflags; 375 376 PUFFS_MSG_ENQUEUEWAIT(pmp, park_unmount, error); 377 PUFFS_MSG_RELEASE(unmount); 378 379 error = checkerr(pmp, error, __func__); 380 DPRINTF(("puffs_unmount: error %d force %d\n", error, force)); 381 382 mutex_enter(&pmp->pmp_lock); 383 pmp->pmp_unmounting = 0; 384 cv_broadcast(&pmp->pmp_unmounting_cv); 385 } 386 387 /* 388 * if userspace cooperated or we really need to die, 389 * screw what userland thinks and just die. 390 */ 391 if (error == 0 || force) { 392 struct puffs_sopreq *psopr; 393 394 /* tell waiters & other resources to go unwait themselves */ 395 puffs_userdead(pmp); 396 putter_detach(pmp->pmp_pi); 397 398 /* 399 * Wait until there are no more users for the mount resource. 400 * Notice that this is hooked against transport_close 401 * and return from touser. In an ideal world, it would 402 * be hooked against final return from all operations. 403 * But currently it works well enough, since nobody 404 * does weird blocking voodoo after return from touser(). 405 */ 406 while (pmp->pmp_refcount != 0) 407 cv_wait(&pmp->pmp_refcount_cv, &pmp->pmp_lock); 408 mutex_exit(&pmp->pmp_lock); 409 410 /* 411 * Release kernel thread now that there is nothing 412 * it would be wanting to lock. 413 */ 414 KASSERT(curlwp != uvm.pagedaemon_lwp); 415 psopr = kmem_alloc(sizeof(*psopr), KM_SLEEP); 416 psopr->psopr_sopreq = PUFFS_SOPREQSYS_EXIT; 417 mutex_enter(&pmp->pmp_sopmtx); 418 if (pmp->pmp_sopthrcount == 0) { 419 mutex_exit(&pmp->pmp_sopmtx); 420 kmem_free(psopr, sizeof(*psopr)); 421 mutex_enter(&pmp->pmp_sopmtx); 422 KASSERT(pmp->pmp_sopthrcount == 0); 423 } else { 424 TAILQ_INSERT_TAIL(&pmp->pmp_sopfastreqs, 425 psopr, psopr_entries); 426 cv_signal(&pmp->pmp_sopcv); 427 } 428 while (pmp->pmp_sopthrcount > 0) 429 cv_wait(&pmp->pmp_sopcv, &pmp->pmp_sopmtx); 430 mutex_exit(&pmp->pmp_sopmtx); 431 432 /* free resources now that we hopefully have no waiters left */ 433 cv_destroy(&pmp->pmp_unmounting_cv); 434 cv_destroy(&pmp->pmp_refcount_cv); 435 cv_destroy(&pmp->pmp_msg_waiter_cv); 436 cv_destroy(&pmp->pmp_sopcv); 437 mutex_destroy(&pmp->pmp_lock); 438 mutex_destroy(&pmp->pmp_sopmtx); 439 440 kmem_free(pmp, sizeof(struct puffs_mount)); 441 error = 0; 442 } else { 443 mutex_exit(&pmp->pmp_lock); 444 } 445 446 out: 447 DPRINTF(("puffs_unmount: return %d\n", error)); 448 return error; 449} 450 451/* 452 * This doesn't need to travel to userspace 453 */ 454int 455puffs_vfsop_root(struct mount *mp, int lktype, struct vnode **vpp) 456{ 457 struct puffs_mount *pmp = MPTOPUFFSMP(mp); 458 int rv; 459 460 rv = puffs_cookie2vnode(pmp, pmp->pmp_root_cookie, vpp); 461 KASSERT(rv != PUFFS_NOSUCHCOOKIE); 462 if (rv != 0) 463 return rv; 464 rv = vn_lock(*vpp, lktype); 465 if (rv != 0) { 466 vrele(*vpp); 467 *vpp = NULL; 468 return rv; 469 } 470 return 0; 471} 472 473int 474puffs_vfsop_statvfs(struct mount *mp, struct statvfs *sbp) 475{ 476 PUFFS_MSG_VARS(vfs, statvfs); 477 struct puffs_mount *pmp; 478 int error = 0; 479 480 pmp = MPTOPUFFSMP(mp); 481 482 /* 483 * If we are mounting, it means that the userspace counterpart 484 * is calling mount(2), but mount(2) also calls statvfs. So 485 * requesting statvfs from userspace would mean a deadlock. 486 * Compensate. 487 */ 488 if (__predict_false(pmp->pmp_status == PUFFSTAT_MOUNTING)) 489 return EINPROGRESS; 490 491 PUFFS_MSG_ALLOC(vfs, statvfs); 492 puffs_msg_setinfo(park_statvfs, PUFFSOP_VFS, PUFFS_VFS_STATVFS, NULL); 493 494 PUFFS_MSG_ENQUEUEWAIT(pmp, park_statvfs, error); 495 error = checkerr(pmp, error, __func__); 496 statvfs_msg->pvfsr_sb.f_iosize = DEV_BSIZE; 497 498 /* 499 * Try to produce a sensible result even in the event 500 * of userspace error. 501 * 502 * XXX: cache the copy in non-error case 503 */ 504 if (!error) { 505 puffs_statvfs_to_statvfs(&statvfs_msg->pvfsr_sb, sbp); 506 } 507 copy_statvfs_info(sbp, mp); 508 if (!error) { 509 statvfs_to_puffs_statvfs(sbp, &statvfs_msg->pvfsr_sb); 510 } 511 512 PUFFS_MSG_RELEASE(statvfs); 513 return error; 514} 515 516static bool 517pageflush_selector(void *cl, struct vnode *vp) 518{ 519 520 KASSERT(mutex_owned(vp->v_interlock)); 521 522 return vp->v_type == VREG && 523 !(LIST_EMPTY(&vp->v_dirtyblkhd) && 524 (vp->v_iflag & VI_ONWORKLST) == 0); 525 526} 527 528static int 529pageflush(struct mount *mp, kauth_cred_t cred, int waitfor) 530{ 531 struct puffs_node *pn; 532 struct vnode *vp; 533 struct vnode_iterator *marker; 534 int error, rv, fsyncwait; 535 536 error = 0; 537 fsyncwait = (waitfor == MNT_WAIT) ? FSYNC_WAIT : 0; 538 539 /* 540 * Sync all cached data from regular vnodes (which are not 541 * currently locked, see below). After this we call VFS_SYNC 542 * for the fs server, which should handle data and metadata for 543 * all the nodes it knows to exist. 544 */ 545 vfs_vnode_iterator_init(mp, &marker); 546 while ((vp = vfs_vnode_iterator_next(marker, pageflush_selector, 547 NULL))) 548 { 549 /* 550 * Here we try to get a reference to the vnode and to 551 * lock it. This is mostly cargo-culted, but I will 552 * offer an explanation to why I believe this might 553 * actually do the right thing. 554 * 555 * If the vnode is a goner, we quite obviously don't need 556 * to sync it. 557 * 558 * If the vnode was busy, we don't need to sync it because 559 * this is never called with MNT_WAIT except from 560 * dounmount(), when we are wait-flushing all the dirty 561 * vnodes through other routes in any case. So there, 562 * sync() doesn't actually sync. Happy now? 563 */ 564 error = vn_lock(vp, LK_EXCLUSIVE | LK_NOWAIT); 565 if (error) { 566 vrele(vp); 567 continue; 568 } 569 pn = VPTOPP(vp); 570 /* hmm.. is the FAF thing entirely sensible? */ 571 if (waitfor == MNT_LAZY) { 572 mutex_enter(vp->v_interlock); 573 pn->pn_stat |= PNODE_FAF; 574 mutex_exit(vp->v_interlock); 575 } 576 rv = VOP_FSYNC(vp, cred, fsyncwait, 0, 0); 577 if (waitfor == MNT_LAZY) { 578 mutex_enter(vp->v_interlock); 579 pn->pn_stat &= ~PNODE_FAF; 580 mutex_exit(vp->v_interlock); 581 } 582 if (rv) 583 error = rv; 584 vput(vp); 585 } 586 vfs_vnode_iterator_destroy(marker); 587 588 return error; 589} 590 591int 592puffs_vfsop_sync(struct mount *mp, int waitfor, struct kauth_cred *cred) 593{ 594 PUFFS_MSG_VARS(vfs, sync); 595 struct puffs_mount *pmp = MPTOPUFFSMP(mp); 596 int error, rv; 597 598 error = pageflush(mp, cred, waitfor); 599 600 /* sync fs */ 601 PUFFS_MSG_ALLOC(vfs, sync); 602 sync_msg->pvfsr_waitfor = waitfor; 603 puffs_credcvt(&sync_msg->pvfsr_cred, cred); 604 puffs_msg_setinfo(park_sync, PUFFSOP_VFS, PUFFS_VFS_SYNC, NULL); 605 606 PUFFS_MSG_ENQUEUEWAIT(pmp, park_sync, rv); 607 rv = checkerr(pmp, rv, __func__); 608 if (rv) 609 error = rv; 610 611 PUFFS_MSG_RELEASE(sync); 612 return error; 613} 614 615int 616puffs_vfsop_fhtovp(struct mount *mp, struct fid *fhp, int lktype, 617 struct vnode **vpp) 618{ 619 PUFFS_MSG_VARS(vfs, fhtonode); 620 struct puffs_mount *pmp = MPTOPUFFSMP(mp); 621 struct vnode *vp; 622 void *fhdata; 623 size_t argsize, fhlen; 624 int error; 625 626 if (pmp->pmp_args.pa_fhsize == 0) 627 return EOPNOTSUPP; 628 629 if (pmp->pmp_args.pa_fhflags & PUFFS_FHFLAG_PASSTHROUGH) { 630 fhlen = fhp->fid_len; 631 fhdata = fhp; 632 } else { 633 fhlen = PUFFS_FROMFHSIZE(fhp->fid_len); 634 fhdata = fhp->fid_data; 635 636 if (pmp->pmp_args.pa_fhflags & PUFFS_FHFLAG_DYNAMIC) { 637 if (pmp->pmp_args.pa_fhsize < fhlen) 638 return EINVAL; 639 } else { 640 if (pmp->pmp_args.pa_fhsize != fhlen) 641 return EINVAL; 642 } 643 } 644 645 argsize = sizeof(struct puffs_vfsmsg_fhtonode) + fhlen; 646 puffs_msgmem_alloc(argsize, &park_fhtonode, (void *)&fhtonode_msg, 1); 647 fhtonode_msg->pvfsr_dsize = fhlen; 648 memcpy(fhtonode_msg->pvfsr_data, fhdata, fhlen); 649 puffs_msg_setinfo(park_fhtonode, PUFFSOP_VFS, PUFFS_VFS_FHTOVP, NULL); 650 651 PUFFS_MSG_ENQUEUEWAIT(pmp, park_fhtonode, error); 652 error = checkerr(pmp, error, __func__); 653 if (error) 654 goto out; 655 656 error = puffs_getvnode(mp, fhtonode_msg->pvfsr_fhcookie, 657 fhtonode_msg->pvfsr_vtype, fhtonode_msg->pvfsr_size, 658 fhtonode_msg->pvfsr_rdev, &vp); 659 if (error) 660 goto out; 661 vn_lock(vp, lktype | LK_RETRY); 662 663 *vpp = vp; 664 out: 665 puffs_msgmem_release(park_fhtonode); 666 return error; 667} 668 669int 670puffs_vfsop_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) 671{ 672 PUFFS_MSG_VARS(vfs, nodetofh); 673 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount); 674 size_t argsize, fhlen; 675 int error; 676 677 if (pmp->pmp_args.pa_fhsize == 0) 678 return EOPNOTSUPP; 679 680 /* if file handles are static len, we can test len immediately */ 681 if (((pmp->pmp_args.pa_fhflags & PUFFS_FHFLAG_DYNAMIC) == 0) 682 && ((pmp->pmp_args.pa_fhflags & PUFFS_FHFLAG_PASSTHROUGH) == 0) 683 && (PUFFS_FROMFHSIZE(*fh_size) < pmp->pmp_args.pa_fhsize)) { 684 *fh_size = PUFFS_TOFHSIZE(pmp->pmp_args.pa_fhsize); 685 return E2BIG; 686 } 687 688 if (pmp->pmp_args.pa_fhflags & PUFFS_FHFLAG_PASSTHROUGH) 689 fhlen = *fh_size; 690 else 691 fhlen = PUFFS_FROMFHSIZE(*fh_size); 692 693 argsize = sizeof(struct puffs_vfsmsg_nodetofh) + fhlen; 694 puffs_msgmem_alloc(argsize, &park_nodetofh, (void *)&nodetofh_msg, 1); 695 nodetofh_msg->pvfsr_fhcookie = VPTOPNC(vp); 696 nodetofh_msg->pvfsr_dsize = fhlen; 697 puffs_msg_setinfo(park_nodetofh, PUFFSOP_VFS, PUFFS_VFS_VPTOFH, NULL); 698 699 PUFFS_MSG_ENQUEUEWAIT(pmp, park_nodetofh, error); 700 error = checkerr(pmp, error, __func__); 701 702 if (pmp->pmp_args.pa_fhflags & PUFFS_FHFLAG_PASSTHROUGH) 703 fhlen = nodetofh_msg->pvfsr_dsize; 704 else if (pmp->pmp_args.pa_fhflags & PUFFS_FHFLAG_DYNAMIC) 705 fhlen = PUFFS_TOFHSIZE(nodetofh_msg->pvfsr_dsize); 706 else 707 fhlen = PUFFS_TOFHSIZE(pmp->pmp_args.pa_fhsize); 708 709 if (error) { 710 if (error == E2BIG) 711 *fh_size = fhlen; 712 goto out; 713 } 714 715 if (fhlen > FHANDLE_SIZE_MAX) { 716 puffs_senderr(pmp, PUFFS_ERR_VPTOFH, E2BIG, 717 "file handle too big", VPTOPNC(vp)); 718 error = EPROTO; 719 goto out; 720 } 721 722 if (*fh_size < fhlen) { 723 *fh_size = fhlen; 724 error = E2BIG; 725 goto out; 726 } 727 *fh_size = fhlen; 728 729 if (fhp) { 730 if (pmp->pmp_args.pa_fhflags & PUFFS_FHFLAG_PASSTHROUGH) { 731 memcpy(fhp, nodetofh_msg->pvfsr_data, fhlen); 732 } else { 733 fhp->fid_len = *fh_size; 734 memcpy(fhp->fid_data, nodetofh_msg->pvfsr_data, 735 nodetofh_msg->pvfsr_dsize); 736 } 737 } 738 739 out: 740 puffs_msgmem_release(park_nodetofh); 741 return error; 742} 743 744int 745puffs_vfsop_loadvnode(struct mount *mp, struct vnode *vp, 746 const void *key, size_t key_len, const void **new_key) 747{ 748 struct puffs_mount *pmp; 749 struct puffs_node *pnode; 750 751 KASSERT(key_len == sizeof(puffs_cookie_t)); 752 753 pmp = MPTOPUFFSMP(mp); 754 755 /* Allocate and initialize the pnode. */ 756 pnode = pool_get(&puffs_pnpool, PR_WAITOK); 757 memset(pnode, 0, sizeof(struct puffs_node)); 758 759 pnode->pn_vp = vp; 760 memcpy(&pnode->pn_cookie, key, key_len); 761 pnode->pn_refcount = 1; 762 mutex_init(&pnode->pn_mtx, MUTEX_DEFAULT, IPL_NONE); 763 mutex_init(&pnode->pn_sizemtx, MUTEX_DEFAULT, IPL_NONE); 764 selinit(&pnode->pn_sel); 765 vp->v_tag = VT_PUFFS; 766 vp->v_type = VNON; 767 vp->v_op = puffs_vnodeop_p; 768 if (pnode->pn_cookie == pmp->pmp_root_cookie) 769 vp->v_vflag |= VV_ROOT; 770 vp->v_data = pnode; 771 772 genfs_node_init(vp, &puffs_genfsops); 773 uvm_vnp_setsize(vp, 0); 774 775 *new_key = &pnode->pn_cookie; 776 return 0; 777} 778 779void 780puffs_vfsop_init(void) 781{ 782 783 /* some checks depend on this */ 784 KASSERT(VNOVAL == VSIZENOTSET); 785 786 pool_init(&puffs_pnpool, sizeof(struct puffs_node), 0, 0, 0, 787 "puffpnpl", &pool_allocator_nointr, IPL_NONE); 788 pool_init(&puffs_vapool, sizeof(struct vattr), 0, 0, 0, 789 "puffvapl", &pool_allocator_nointr, IPL_NONE); 790 puffs_msgif_init(); 791} 792 793void 794puffs_vfsop_done(void) 795{ 796 797 puffs_msgif_destroy(); 798 pool_destroy(&puffs_pnpool); 799 pool_destroy(&puffs_vapool); 800} 801 802int 803puffs_vfsop_snapshot(struct mount *mp, struct vnode *vp, struct timespec *ts) 804{ 805 806 return EOPNOTSUPP; 807} 808 809int 810puffs_vfsop_extattrctl(struct mount *mp, int cmd, struct vnode *vp, 811 int attrnamespace, const char *attrname) 812{ 813 PUFFS_MSG_VARS(vfs, extattrctl); 814 struct puffs_mount *pmp = MPTOPUFFSMP(mp); 815 struct puffs_node *pnp; 816 puffs_cookie_t pnc; 817 int error, flags; 818 819 if (vp) { 820 /* doesn't make sense for puffs servers */ 821 if (vp->v_mount != mp) 822 return EXDEV; 823 pnp = vp->v_data; 824 pnc = pnp->pn_cookie; 825 flags = PUFFS_EXTATTRCTL_HASNODE; 826 } else { 827 pnp = pnc = NULL; 828 flags = 0; 829 } 830 831 PUFFS_MSG_ALLOC(vfs, extattrctl); 832 extattrctl_msg->pvfsr_cmd = cmd; 833 extattrctl_msg->pvfsr_attrnamespace = attrnamespace; 834 extattrctl_msg->pvfsr_flags = flags; 835 if (attrname) { 836 strlcpy(extattrctl_msg->pvfsr_attrname, attrname, 837 sizeof(extattrctl_msg->pvfsr_attrname)); 838 extattrctl_msg->pvfsr_flags |= PUFFS_EXTATTRCTL_HASATTRNAME; 839 } 840 puffs_msg_setinfo(park_extattrctl, 841 PUFFSOP_VFS, PUFFS_VFS_EXTATTRCTL, pnc); 842 843 puffs_msg_enqueue(pmp, park_extattrctl); 844 if (vp) { 845 mutex_enter(&pnp->pn_mtx); 846 puffs_referencenode(pnp); 847 mutex_exit(&pnp->pn_mtx); 848 VOP_UNLOCK(vp); 849 } 850 error = puffs_msg_wait2(pmp, park_extattrctl, pnp, NULL); 851 PUFFS_MSG_RELEASE(extattrctl); 852 if (vp) { 853 puffs_releasenode(pnp); 854 } 855 856 return checkerr(pmp, error, __func__); 857} 858 859const struct vnodeopv_desc * const puffs_vnodeopv_descs[] = { 860 &puffs_vnodeop_opv_desc, 861 &puffs_specop_opv_desc, 862 &puffs_fifoop_opv_desc, 863 &puffs_msgop_opv_desc, 864 NULL, 865}; 866 867struct vfsops puffs_vfsops = { 868 .vfs_name = MOUNT_PUFFS, 869 .vfs_min_mount_data = sizeof (struct puffs_kargs), 870 .vfs_mount = puffs_vfsop_mount, 871 .vfs_start = puffs_vfsop_start, 872 .vfs_unmount = puffs_vfsop_unmount, 873 .vfs_root = puffs_vfsop_root, 874 .vfs_quotactl = (void *)eopnotsupp, 875 .vfs_statvfs = puffs_vfsop_statvfs, 876 .vfs_sync = puffs_vfsop_sync, 877 .vfs_vget = (void *)eopnotsupp, 878 .vfs_loadvnode = puffs_vfsop_loadvnode, 879 .vfs_fhtovp = puffs_vfsop_fhtovp, 880 .vfs_vptofh = puffs_vfsop_vptofh, 881 .vfs_init = puffs_vfsop_init, 882 .vfs_done = puffs_vfsop_done, 883 .vfs_snapshot = puffs_vfsop_snapshot, 884 .vfs_extattrctl = puffs_vfsop_extattrctl, 885 .vfs_suspendctl = genfs_suspendctl, 886 .vfs_renamelock_enter = genfs_renamelock_enter, 887 .vfs_renamelock_exit = genfs_renamelock_exit, 888 .vfs_fsync = (void *)eopnotsupp, 889 .vfs_opv_descs = puffs_vnodeopv_descs 890}; 891 892static int 893puffs_modcmd(modcmd_t cmd, void *arg) 894{ 895 896 switch (cmd) { 897 case MODULE_CMD_INIT: 898 return vfs_attach(&puffs_vfsops); 899 case MODULE_CMD_FINI: 900 return vfs_detach(&puffs_vfsops); 901 default: 902 return ENOTTY; 903 } 904} 905