1 /* 2 * NFS server file handle treatment. 3 * 4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 5 * Portions Copyright (C) 1999 G. Allen Morris III <gam3@acm.org> 6 * Extensive rewrite by Neil Brown <neilb@cse.unsw.edu.au> Southern-Spring 1999 7 * ... and again Southern-Winter 2001 to support export_operations 8 */ 9 10 #include <linux/exportfs.h> 11 12 #include <linux/sunrpc/svcauth_gss.h> 13 #include "nfsd.h" 14 #include "vfs.h" 15 #include "auth.h" 16 17 #define NFSDDBG_FACILITY NFSDDBG_FH 18 19 20 /* 21 * our acceptability function. 22 * if NOSUBTREECHECK, accept anything 23 * if not, require that we can walk up to exp->ex_dentry 24 * doing some checks on the 'x' bits 25 */ 26 static int nfsd_acceptable(void *expv, struct dentry *dentry) 27 { 28 struct svc_export *exp = expv; 29 int rv; 30 struct dentry *tdentry; 31 struct dentry *parent; 32 33 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) 34 return 1; 35 36 tdentry = dget(dentry); 37 while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) { 38 /* make sure parents give x permission to user */ 39 int err; 40 parent = dget_parent(tdentry); 41 err = inode_permission(parent->d_inode, MAY_EXEC); 42 if (err < 0) { 43 dput(parent); 44 break; 45 } 46 dput(tdentry); 47 tdentry = parent; 48 } 49 if (tdentry != exp->ex_path.dentry) 50 dprintk("nfsd_acceptable failed at %p %s\n", tdentry, tdentry->d_name.name); 51 rv = (tdentry == exp->ex_path.dentry); 52 dput(tdentry); 53 return rv; 54 } 55 56 /* Type check. The correct error return for type mismatches does not seem to be 57 * generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a 58 * comment in the NFSv3 spec says this is incorrect (implementation notes for 59 * the write call). 60 */ 61 static inline __be32 62 nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, umode_t requested) 63 { 64 mode &= S_IFMT; 65 66 if (requested == 0) /* the caller doesn't care */ 67 return nfs_ok; 68 if (mode == requested) 69 return nfs_ok; 70 /* 71 * v4 has an error more specific than err_notdir which we should 72 * return in preference to err_notdir: 73 */ 74 if (rqstp->rq_vers == 4 && mode == S_IFLNK) 75 return nfserr_symlink; 76 if (requested == S_IFDIR) 77 return nfserr_notdir; 78 if (mode == S_IFDIR) 79 return nfserr_isdir; 80 return nfserr_inval; 81 } 82 83 static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp, 84 struct svc_export *exp) 85 { 86 int flags = nfsexp_flags(rqstp, exp); 87 88 /* Check if the request originated from a secure port. */ 89 if (!rqstp->rq_secure && !(flags & NFSEXP_INSECURE_PORT)) { 90 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 91 dprintk(KERN_WARNING 92 "nfsd: request from insecure port %s!\n", 93 svc_print_addr(rqstp, buf, sizeof(buf))); 94 return nfserr_perm; 95 } 96 97 /* Set user creds for this exportpoint */ 98 return nfserrno(nfsd_setuser(rqstp, exp)); 99 } 100 101 static inline __be32 check_pseudo_root(struct svc_rqst *rqstp, 102 struct dentry *dentry, struct svc_export *exp) 103 { 104 if (!(exp->ex_flags & NFSEXP_V4ROOT)) 105 return nfs_ok; 106 /* 107 * v2/v3 clients have no need for the V4ROOT export--they use 108 * the mount protocl instead; also, further V4ROOT checks may be 109 * in v4-specific code, in which case v2/v3 clients could bypass 110 * them. 111 */ 112 if (!nfsd_v4client(rqstp)) 113 return nfserr_stale; 114 /* 115 * We're exposing only the directories and symlinks that have to be 116 * traversed on the way to real exports: 117 */ 118 if (unlikely(!S_ISDIR(dentry->d_inode->i_mode) && 119 !S_ISLNK(dentry->d_inode->i_mode))) 120 return nfserr_stale; 121 /* 122 * A pseudoroot export gives permission to access only one 123 * single directory; the kernel has to make another upcall 124 * before granting access to anything else under it: 125 */ 126 if (unlikely(dentry != exp->ex_path.dentry)) 127 return nfserr_stale; 128 return nfs_ok; 129 } 130 131 /* 132 * Use the given filehandle to look up the corresponding export and 133 * dentry. On success, the results are used to set fh_export and 134 * fh_dentry. 135 */ 136 static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp) 137 { 138 struct knfsd_fh *fh = &fhp->fh_handle; 139 struct fid *fid = NULL, sfid; 140 struct svc_export *exp; 141 struct dentry *dentry; 142 int fileid_type; 143 int data_left = fh->fh_size/4; 144 __be32 error; 145 146 error = nfserr_stale; 147 if (rqstp->rq_vers > 2) 148 error = nfserr_badhandle; 149 if (rqstp->rq_vers == 4 && fh->fh_size == 0) 150 return nfserr_nofilehandle; 151 152 if (fh->fh_version == 1) { 153 int len; 154 155 if (--data_left < 0) 156 return error; 157 if (fh->fh_auth_type != 0) 158 return error; 159 len = key_len(fh->fh_fsid_type) / 4; 160 if (len == 0) 161 return error; 162 if (fh->fh_fsid_type == FSID_MAJOR_MINOR) { 163 /* deprecated, convert to type 3 */ 164 len = key_len(FSID_ENCODE_DEV)/4; 165 fh->fh_fsid_type = FSID_ENCODE_DEV; 166 fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1]))); 167 fh->fh_fsid[1] = fh->fh_fsid[2]; 168 } 169 data_left -= len; 170 if (data_left < 0) 171 return error; 172 exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_auth); 173 fid = (struct fid *)(fh->fh_auth + len); 174 } else { 175 __u32 tfh[2]; 176 dev_t xdev; 177 ino_t xino; 178 179 if (fh->fh_size != NFS_FHSIZE) 180 return error; 181 /* assume old filehandle format */ 182 xdev = old_decode_dev(fh->ofh_xdev); 183 xino = u32_to_ino_t(fh->ofh_xino); 184 mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL); 185 exp = rqst_exp_find(rqstp, FSID_DEV, tfh); 186 } 187 188 error = nfserr_stale; 189 if (PTR_ERR(exp) == -ENOENT) 190 return error; 191 192 if (IS_ERR(exp)) 193 return nfserrno(PTR_ERR(exp)); 194 195 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) { 196 /* Elevate privileges so that the lack of 'r' or 'x' 197 * permission on some parent directory will 198 * not stop exportfs_decode_fh from being able 199 * to reconnect a directory into the dentry cache. 200 * The same problem can affect "SUBTREECHECK" exports, 201 * but as nfsd_acceptable depends on correct 202 * access control settings being in effect, we cannot 203 * fix that case easily. 204 */ 205 struct cred *new = prepare_creds(); 206 if (!new) 207 return nfserrno(-ENOMEM); 208 new->cap_effective = 209 cap_raise_nfsd_set(new->cap_effective, 210 new->cap_permitted); 211 put_cred(override_creds(new)); 212 put_cred(new); 213 } else { 214 error = nfsd_setuser_and_check_port(rqstp, exp); 215 if (error) 216 goto out; 217 } 218 219 /* 220 * Look up the dentry using the NFS file handle. 221 */ 222 error = nfserr_stale; 223 if (rqstp->rq_vers > 2) 224 error = nfserr_badhandle; 225 226 if (fh->fh_version != 1) { 227 sfid.i32.ino = fh->ofh_ino; 228 sfid.i32.gen = fh->ofh_generation; 229 sfid.i32.parent_ino = fh->ofh_dirino; 230 fid = &sfid; 231 data_left = 3; 232 if (fh->ofh_dirino == 0) 233 fileid_type = FILEID_INO32_GEN; 234 else 235 fileid_type = FILEID_INO32_GEN_PARENT; 236 } else 237 fileid_type = fh->fh_fileid_type; 238 239 if (fileid_type == FILEID_ROOT) 240 dentry = dget(exp->ex_path.dentry); 241 else { 242 dentry = exportfs_decode_fh(exp->ex_path.mnt, fid, 243 data_left, fileid_type, 244 nfsd_acceptable, exp); 245 } 246 if (dentry == NULL) 247 goto out; 248 if (IS_ERR(dentry)) { 249 if (PTR_ERR(dentry) != -EINVAL) 250 error = nfserrno(PTR_ERR(dentry)); 251 goto out; 252 } 253 254 if (S_ISDIR(dentry->d_inode->i_mode) && 255 (dentry->d_flags & DCACHE_DISCONNECTED)) { 256 printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n", 257 dentry->d_parent->d_name.name, dentry->d_name.name); 258 } 259 260 fhp->fh_dentry = dentry; 261 fhp->fh_export = exp; 262 return 0; 263 out: 264 exp_put(exp); 265 return error; 266 } 267 268 /** 269 * fh_verify - filehandle lookup and access checking 270 * @rqstp: pointer to current rpc request 271 * @fhp: filehandle to be verified 272 * @type: expected type of object pointed to by filehandle 273 * @access: type of access needed to object 274 * 275 * Look up a dentry from the on-the-wire filehandle, check the client's 276 * access to the export, and set the current task's credentials. 277 * 278 * Regardless of success or failure of fh_verify(), fh_put() should be 279 * called on @fhp when the caller is finished with the filehandle. 280 * 281 * fh_verify() may be called multiple times on a given filehandle, for 282 * example, when processing an NFSv4 compound. The first call will look 283 * up a dentry using the on-the-wire filehandle. Subsequent calls will 284 * skip the lookup and just perform the other checks and possibly change 285 * the current task's credentials. 286 * 287 * @type specifies the type of object expected using one of the S_IF* 288 * constants defined in include/linux/stat.h. The caller may use zero 289 * to indicate that it doesn't care, or a negative integer to indicate 290 * that it expects something not of the given type. 291 * 292 * @access is formed from the NFSD_MAY_* constants defined in 293 * include/linux/nfsd/nfsd.h. 294 */ 295 __be32 296 fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access) 297 { 298 struct svc_export *exp; 299 struct dentry *dentry; 300 __be32 error; 301 302 dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp)); 303 304 if (!fhp->fh_dentry) { 305 error = nfsd_set_fh_dentry(rqstp, fhp); 306 if (error) 307 goto out; 308 } 309 dentry = fhp->fh_dentry; 310 exp = fhp->fh_export; 311 /* 312 * We still have to do all these permission checks, even when 313 * fh_dentry is already set: 314 * - fh_verify may be called multiple times with different 315 * "access" arguments (e.g. nfsd_proc_create calls 316 * fh_verify(...,NFSD_MAY_EXEC) first, then later (in 317 * nfsd_create) calls fh_verify(...,NFSD_MAY_CREATE). 318 * - in the NFSv4 case, the filehandle may have been filled 319 * in by fh_compose, and given a dentry, but further 320 * compound operations performed with that filehandle 321 * still need permissions checks. In the worst case, a 322 * mountpoint crossing may have changed the export 323 * options, and we may now need to use a different uid 324 * (for example, if different id-squashing options are in 325 * effect on the new filesystem). 326 */ 327 error = check_pseudo_root(rqstp, dentry, exp); 328 if (error) 329 goto out; 330 331 error = nfsd_setuser_and_check_port(rqstp, exp); 332 if (error) 333 goto out; 334 335 error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type); 336 if (error) 337 goto out; 338 339 /* 340 * pseudoflavor restrictions are not enforced on NLM, 341 * which clients virtually always use auth_sys for, 342 * even while using RPCSEC_GSS for NFS. 343 */ 344 if (access & NFSD_MAY_LOCK || access & NFSD_MAY_BYPASS_GSS) 345 goto skip_pseudoflavor_check; 346 /* 347 * Clients may expect to be able to use auth_sys during mount, 348 * even if they use gss for everything else; see section 2.3.2 349 * of rfc 2623. 350 */ 351 if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT 352 && exp->ex_path.dentry == dentry) 353 goto skip_pseudoflavor_check; 354 355 error = check_nfsd_access(exp, rqstp); 356 if (error) 357 goto out; 358 359 skip_pseudoflavor_check: 360 /* Finally, check access permissions. */ 361 error = nfsd_permission(rqstp, exp, dentry, access); 362 363 if (error) { 364 dprintk("fh_verify: %s/%s permission failure, " 365 "acc=%x, error=%d\n", 366 dentry->d_parent->d_name.name, 367 dentry->d_name.name, 368 access, ntohl(error)); 369 } 370 out: 371 if (error == nfserr_stale) 372 nfsdstats.fh_stale++; 373 return error; 374 } 375 376 377 /* 378 * Compose a file handle for an NFS reply. 379 * 380 * Note that when first composed, the dentry may not yet have 381 * an inode. In this case a call to fh_update should be made 382 * before the fh goes out on the wire ... 383 */ 384 static void _fh_update(struct svc_fh *fhp, struct svc_export *exp, 385 struct dentry *dentry) 386 { 387 if (dentry != exp->ex_path.dentry) { 388 struct fid *fid = (struct fid *) 389 (fhp->fh_handle.fh_auth + fhp->fh_handle.fh_size/4 - 1); 390 int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4; 391 int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK); 392 393 fhp->fh_handle.fh_fileid_type = 394 exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck); 395 fhp->fh_handle.fh_size += maxsize * 4; 396 } else { 397 fhp->fh_handle.fh_fileid_type = FILEID_ROOT; 398 } 399 } 400 401 /* 402 * for composing old style file handles 403 */ 404 static inline void _fh_update_old(struct dentry *dentry, 405 struct svc_export *exp, 406 struct knfsd_fh *fh) 407 { 408 fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino); 409 fh->ofh_generation = dentry->d_inode->i_generation; 410 if (S_ISDIR(dentry->d_inode->i_mode) || 411 (exp->ex_flags & NFSEXP_NOSUBTREECHECK)) 412 fh->ofh_dirino = 0; 413 } 414 415 static bool is_root_export(struct svc_export *exp) 416 { 417 return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root; 418 } 419 420 static struct super_block *exp_sb(struct svc_export *exp) 421 { 422 return exp->ex_path.dentry->d_inode->i_sb; 423 } 424 425 static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp) 426 { 427 switch (fsid_type) { 428 case FSID_DEV: 429 if (!old_valid_dev(exp_sb(exp)->s_dev)) 430 return 0; 431 /* FALL THROUGH */ 432 case FSID_MAJOR_MINOR: 433 case FSID_ENCODE_DEV: 434 return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV; 435 case FSID_NUM: 436 return exp->ex_flags & NFSEXP_FSID; 437 case FSID_UUID8: 438 case FSID_UUID16: 439 if (!is_root_export(exp)) 440 return 0; 441 /* fall through */ 442 case FSID_UUID4_INUM: 443 case FSID_UUID16_INUM: 444 return exp->ex_uuid != NULL; 445 } 446 return 1; 447 } 448 449 450 static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh) 451 { 452 u8 version; 453 u8 fsid_type; 454 retry: 455 version = 1; 456 if (ref_fh && ref_fh->fh_export == exp) { 457 version = ref_fh->fh_handle.fh_version; 458 fsid_type = ref_fh->fh_handle.fh_fsid_type; 459 460 ref_fh = NULL; 461 462 switch (version) { 463 case 0xca: 464 fsid_type = FSID_DEV; 465 break; 466 case 1: 467 break; 468 default: 469 goto retry; 470 } 471 472 /* 473 * As the fsid -> filesystem mapping was guided by 474 * user-space, there is no guarantee that the filesystem 475 * actually supports that fsid type. If it doesn't we 476 * loop around again without ref_fh set. 477 */ 478 if (!fsid_type_ok_for_exp(fsid_type, exp)) 479 goto retry; 480 } else if (exp->ex_flags & NFSEXP_FSID) { 481 fsid_type = FSID_NUM; 482 } else if (exp->ex_uuid) { 483 if (fhp->fh_maxsize >= 64) { 484 if (is_root_export(exp)) 485 fsid_type = FSID_UUID16; 486 else 487 fsid_type = FSID_UUID16_INUM; 488 } else { 489 if (is_root_export(exp)) 490 fsid_type = FSID_UUID8; 491 else 492 fsid_type = FSID_UUID4_INUM; 493 } 494 } else if (!old_valid_dev(exp_sb(exp)->s_dev)) 495 /* for newer device numbers, we must use a newer fsid format */ 496 fsid_type = FSID_ENCODE_DEV; 497 else 498 fsid_type = FSID_DEV; 499 fhp->fh_handle.fh_version = version; 500 if (version) 501 fhp->fh_handle.fh_fsid_type = fsid_type; 502 } 503 504 __be32 505 fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, 506 struct svc_fh *ref_fh) 507 { 508 /* ref_fh is a reference file handle. 509 * if it is non-null and for the same filesystem, then we should compose 510 * a filehandle which is of the same version, where possible. 511 * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca 512 * Then create a 32byte filehandle using nfs_fhbase_old 513 * 514 */ 515 516 struct inode * inode = dentry->d_inode; 517 struct dentry *parent = dentry->d_parent; 518 __u32 *datap; 519 dev_t ex_dev = exp_sb(exp)->s_dev; 520 521 dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n", 522 MAJOR(ex_dev), MINOR(ex_dev), 523 (long) exp->ex_path.dentry->d_inode->i_ino, 524 parent->d_name.name, dentry->d_name.name, 525 (inode ? inode->i_ino : 0)); 526 527 /* Choose filehandle version and fsid type based on 528 * the reference filehandle (if it is in the same export) 529 * or the export options. 530 */ 531 set_version_and_fsid_type(fhp, exp, ref_fh); 532 533 if (ref_fh == fhp) 534 fh_put(ref_fh); 535 536 if (fhp->fh_locked || fhp->fh_dentry) { 537 printk(KERN_ERR "fh_compose: fh %s/%s not initialized!\n", 538 parent->d_name.name, dentry->d_name.name); 539 } 540 if (fhp->fh_maxsize < NFS_FHSIZE) 541 printk(KERN_ERR "fh_compose: called with maxsize %d! %s/%s\n", 542 fhp->fh_maxsize, 543 parent->d_name.name, dentry->d_name.name); 544 545 fhp->fh_dentry = dget(dentry); /* our internal copy */ 546 fhp->fh_export = exp; 547 cache_get(&exp->h); 548 549 if (fhp->fh_handle.fh_version == 0xca) { 550 /* old style filehandle please */ 551 memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE); 552 fhp->fh_handle.fh_size = NFS_FHSIZE; 553 fhp->fh_handle.ofh_dcookie = 0xfeebbaca; 554 fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev); 555 fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev; 556 fhp->fh_handle.ofh_xino = 557 ino_t_to_u32(exp->ex_path.dentry->d_inode->i_ino); 558 fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry)); 559 if (inode) 560 _fh_update_old(dentry, exp, &fhp->fh_handle); 561 } else { 562 int len; 563 fhp->fh_handle.fh_auth_type = 0; 564 datap = fhp->fh_handle.fh_auth+0; 565 mk_fsid(fhp->fh_handle.fh_fsid_type, datap, ex_dev, 566 exp->ex_path.dentry->d_inode->i_ino, 567 exp->ex_fsid, exp->ex_uuid); 568 569 len = key_len(fhp->fh_handle.fh_fsid_type); 570 datap += len/4; 571 fhp->fh_handle.fh_size = 4 + len; 572 573 if (inode) 574 _fh_update(fhp, exp, dentry); 575 if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) { 576 fh_put(fhp); 577 return nfserr_opnotsupp; 578 } 579 } 580 581 return 0; 582 } 583 584 /* 585 * Update file handle information after changing a dentry. 586 * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create 587 */ 588 __be32 589 fh_update(struct svc_fh *fhp) 590 { 591 struct dentry *dentry; 592 593 if (!fhp->fh_dentry) 594 goto out_bad; 595 596 dentry = fhp->fh_dentry; 597 if (!dentry->d_inode) 598 goto out_negative; 599 if (fhp->fh_handle.fh_version != 1) { 600 _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle); 601 } else { 602 if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT) 603 goto out; 604 605 _fh_update(fhp, fhp->fh_export, dentry); 606 if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) 607 return nfserr_opnotsupp; 608 } 609 out: 610 return 0; 611 612 out_bad: 613 printk(KERN_ERR "fh_update: fh not verified!\n"); 614 goto out; 615 out_negative: 616 printk(KERN_ERR "fh_update: %s/%s still negative!\n", 617 dentry->d_parent->d_name.name, dentry->d_name.name); 618 goto out; 619 } 620 621 /* 622 * Release a file handle. 623 */ 624 void 625 fh_put(struct svc_fh *fhp) 626 { 627 struct dentry * dentry = fhp->fh_dentry; 628 struct svc_export * exp = fhp->fh_export; 629 if (dentry) { 630 fh_unlock(fhp); 631 fhp->fh_dentry = NULL; 632 dput(dentry); 633 #ifdef CONFIG_NFSD_V3 634 fhp->fh_pre_saved = 0; 635 fhp->fh_post_saved = 0; 636 #endif 637 } 638 fh_drop_write(fhp); 639 if (exp) { 640 exp_put(exp); 641 fhp->fh_export = NULL; 642 } 643 return; 644 } 645 646 /* 647 * Shorthand for dprintk()'s 648 */ 649 char * SVCFH_fmt(struct svc_fh *fhp) 650 { 651 struct knfsd_fh *fh = &fhp->fh_handle; 652 653 static char buf[80]; 654 sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x", 655 fh->fh_size, 656 fh->fh_base.fh_pad[0], 657 fh->fh_base.fh_pad[1], 658 fh->fh_base.fh_pad[2], 659 fh->fh_base.fh_pad[3], 660 fh->fh_base.fh_pad[4], 661 fh->fh_base.fh_pad[5]); 662 return buf; 663 } 664 665 enum fsid_source fsid_source(struct svc_fh *fhp) 666 { 667 if (fhp->fh_handle.fh_version != 1) 668 return FSIDSOURCE_DEV; 669 switch(fhp->fh_handle.fh_fsid_type) { 670 case FSID_DEV: 671 case FSID_ENCODE_DEV: 672 case FSID_MAJOR_MINOR: 673 if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV) 674 return FSIDSOURCE_DEV; 675 break; 676 case FSID_NUM: 677 if (fhp->fh_export->ex_flags & NFSEXP_FSID) 678 return FSIDSOURCE_FSID; 679 break; 680 default: 681 break; 682 } 683 /* either a UUID type filehandle, or the filehandle doesn't 684 * match the export. 685 */ 686 if (fhp->fh_export->ex_flags & NFSEXP_FSID) 687 return FSIDSOURCE_FSID; 688 if (fhp->fh_export->ex_uuid) 689 return FSIDSOURCE_UUID; 690 return FSIDSOURCE_DEV; 691 } 692