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(d_inode(parent), 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 %pd\n", tdentry, tdentry); 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, struct dentry *dentry, 63 umode_t requested) 64 { 65 umode_t mode = d_inode(dentry)->i_mode & S_IFMT; 66 67 if (requested == 0) /* the caller doesn't care */ 68 return nfs_ok; 69 if (mode == requested) { 70 if (mode == S_IFDIR && !d_can_lookup(dentry)) { 71 WARN_ON_ONCE(1); 72 return nfserr_notdir; 73 } 74 return nfs_ok; 75 } 76 /* 77 * v4 has an error more specific than err_notdir which we should 78 * return in preference to err_notdir: 79 */ 80 if (rqstp->rq_vers == 4 && mode == S_IFLNK) 81 return nfserr_symlink; 82 if (requested == S_IFDIR) 83 return nfserr_notdir; 84 if (mode == S_IFDIR) 85 return nfserr_isdir; 86 return nfserr_inval; 87 } 88 89 static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp, 90 struct svc_export *exp) 91 { 92 int flags = nfsexp_flags(rqstp, exp); 93 94 /* Check if the request originated from a secure port. */ 95 if (!test_bit(RQ_SECURE, &rqstp->rq_flags) && !(flags & NFSEXP_INSECURE_PORT)) { 96 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 97 dprintk("nfsd: request from insecure port %s!\n", 98 svc_print_addr(rqstp, buf, sizeof(buf))); 99 return nfserr_perm; 100 } 101 102 /* Set user creds for this exportpoint */ 103 return nfserrno(nfsd_setuser(rqstp, exp)); 104 } 105 106 static inline __be32 check_pseudo_root(struct svc_rqst *rqstp, 107 struct dentry *dentry, struct svc_export *exp) 108 { 109 if (!(exp->ex_flags & NFSEXP_V4ROOT)) 110 return nfs_ok; 111 /* 112 * v2/v3 clients have no need for the V4ROOT export--they use 113 * the mount protocl instead; also, further V4ROOT checks may be 114 * in v4-specific code, in which case v2/v3 clients could bypass 115 * them. 116 */ 117 if (!nfsd_v4client(rqstp)) 118 return nfserr_stale; 119 /* 120 * We're exposing only the directories and symlinks that have to be 121 * traversed on the way to real exports: 122 */ 123 if (unlikely(!d_is_dir(dentry) && 124 !d_is_symlink(dentry))) 125 return nfserr_stale; 126 /* 127 * A pseudoroot export gives permission to access only one 128 * single directory; the kernel has to make another upcall 129 * before granting access to anything else under it: 130 */ 131 if (unlikely(dentry != exp->ex_path.dentry)) 132 return nfserr_stale; 133 return nfs_ok; 134 } 135 136 /* 137 * Use the given filehandle to look up the corresponding export and 138 * dentry. On success, the results are used to set fh_export and 139 * fh_dentry. 140 */ 141 static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp) 142 { 143 struct knfsd_fh *fh = &fhp->fh_handle; 144 struct fid *fid = NULL, sfid; 145 struct svc_export *exp; 146 struct dentry *dentry; 147 int fileid_type; 148 int data_left = fh->fh_size/4; 149 __be32 error; 150 151 error = nfserr_stale; 152 if (rqstp->rq_vers > 2) 153 error = nfserr_badhandle; 154 if (rqstp->rq_vers == 4 && fh->fh_size == 0) 155 return nfserr_nofilehandle; 156 157 if (fh->fh_version == 1) { 158 int len; 159 160 if (--data_left < 0) 161 return error; 162 if (fh->fh_auth_type != 0) 163 return error; 164 len = key_len(fh->fh_fsid_type) / 4; 165 if (len == 0) 166 return error; 167 if (fh->fh_fsid_type == FSID_MAJOR_MINOR) { 168 /* deprecated, convert to type 3 */ 169 len = key_len(FSID_ENCODE_DEV)/4; 170 fh->fh_fsid_type = FSID_ENCODE_DEV; 171 /* 172 * struct knfsd_fh uses host-endian fields, which are 173 * sometimes used to hold net-endian values. This 174 * confuses sparse, so we must use __force here to 175 * keep it from complaining. 176 */ 177 fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl((__force __be32)fh->fh_fsid[0]), 178 ntohl((__force __be32)fh->fh_fsid[1]))); 179 fh->fh_fsid[1] = fh->fh_fsid[2]; 180 } 181 data_left -= len; 182 if (data_left < 0) 183 return error; 184 exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_fsid); 185 fid = (struct fid *)(fh->fh_fsid + len); 186 } else { 187 __u32 tfh[2]; 188 dev_t xdev; 189 ino_t xino; 190 191 if (fh->fh_size != NFS_FHSIZE) 192 return error; 193 /* assume old filehandle format */ 194 xdev = old_decode_dev(fh->ofh_xdev); 195 xino = u32_to_ino_t(fh->ofh_xino); 196 mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL); 197 exp = rqst_exp_find(rqstp, FSID_DEV, tfh); 198 } 199 200 error = nfserr_stale; 201 if (PTR_ERR(exp) == -ENOENT) 202 return error; 203 204 if (IS_ERR(exp)) 205 return nfserrno(PTR_ERR(exp)); 206 207 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) { 208 /* Elevate privileges so that the lack of 'r' or 'x' 209 * permission on some parent directory will 210 * not stop exportfs_decode_fh from being able 211 * to reconnect a directory into the dentry cache. 212 * The same problem can affect "SUBTREECHECK" exports, 213 * but as nfsd_acceptable depends on correct 214 * access control settings being in effect, we cannot 215 * fix that case easily. 216 */ 217 struct cred *new = prepare_creds(); 218 if (!new) { 219 error = nfserrno(-ENOMEM); 220 goto out; 221 } 222 new->cap_effective = 223 cap_raise_nfsd_set(new->cap_effective, 224 new->cap_permitted); 225 put_cred(override_creds(new)); 226 put_cred(new); 227 } else { 228 error = nfsd_setuser_and_check_port(rqstp, exp); 229 if (error) 230 goto out; 231 } 232 233 /* 234 * Look up the dentry using the NFS file handle. 235 */ 236 error = nfserr_stale; 237 if (rqstp->rq_vers > 2) 238 error = nfserr_badhandle; 239 240 if (fh->fh_version != 1) { 241 sfid.i32.ino = fh->ofh_ino; 242 sfid.i32.gen = fh->ofh_generation; 243 sfid.i32.parent_ino = fh->ofh_dirino; 244 fid = &sfid; 245 data_left = 3; 246 if (fh->ofh_dirino == 0) 247 fileid_type = FILEID_INO32_GEN; 248 else 249 fileid_type = FILEID_INO32_GEN_PARENT; 250 } else 251 fileid_type = fh->fh_fileid_type; 252 253 if (fileid_type == FILEID_ROOT) 254 dentry = dget(exp->ex_path.dentry); 255 else { 256 dentry = exportfs_decode_fh(exp->ex_path.mnt, fid, 257 data_left, fileid_type, 258 nfsd_acceptable, exp); 259 } 260 if (dentry == NULL) 261 goto out; 262 if (IS_ERR(dentry)) { 263 if (PTR_ERR(dentry) != -EINVAL) 264 error = nfserrno(PTR_ERR(dentry)); 265 goto out; 266 } 267 268 if (d_is_dir(dentry) && 269 (dentry->d_flags & DCACHE_DISCONNECTED)) { 270 printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %pd2\n", 271 dentry); 272 } 273 274 fhp->fh_dentry = dentry; 275 fhp->fh_export = exp; 276 return 0; 277 out: 278 exp_put(exp); 279 return error; 280 } 281 282 /** 283 * fh_verify - filehandle lookup and access checking 284 * @rqstp: pointer to current rpc request 285 * @fhp: filehandle to be verified 286 * @type: expected type of object pointed to by filehandle 287 * @access: type of access needed to object 288 * 289 * Look up a dentry from the on-the-wire filehandle, check the client's 290 * access to the export, and set the current task's credentials. 291 * 292 * Regardless of success or failure of fh_verify(), fh_put() should be 293 * called on @fhp when the caller is finished with the filehandle. 294 * 295 * fh_verify() may be called multiple times on a given filehandle, for 296 * example, when processing an NFSv4 compound. The first call will look 297 * up a dentry using the on-the-wire filehandle. Subsequent calls will 298 * skip the lookup and just perform the other checks and possibly change 299 * the current task's credentials. 300 * 301 * @type specifies the type of object expected using one of the S_IF* 302 * constants defined in include/linux/stat.h. The caller may use zero 303 * to indicate that it doesn't care, or a negative integer to indicate 304 * that it expects something not of the given type. 305 * 306 * @access is formed from the NFSD_MAY_* constants defined in 307 * fs/nfsd/vfs.h. 308 */ 309 __be32 310 fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access) 311 { 312 struct svc_export *exp; 313 struct dentry *dentry; 314 __be32 error; 315 316 dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp)); 317 318 if (!fhp->fh_dentry) { 319 error = nfsd_set_fh_dentry(rqstp, fhp); 320 if (error) 321 goto out; 322 } 323 dentry = fhp->fh_dentry; 324 exp = fhp->fh_export; 325 /* 326 * We still have to do all these permission checks, even when 327 * fh_dentry is already set: 328 * - fh_verify may be called multiple times with different 329 * "access" arguments (e.g. nfsd_proc_create calls 330 * fh_verify(...,NFSD_MAY_EXEC) first, then later (in 331 * nfsd_create) calls fh_verify(...,NFSD_MAY_CREATE). 332 * - in the NFSv4 case, the filehandle may have been filled 333 * in by fh_compose, and given a dentry, but further 334 * compound operations performed with that filehandle 335 * still need permissions checks. In the worst case, a 336 * mountpoint crossing may have changed the export 337 * options, and we may now need to use a different uid 338 * (for example, if different id-squashing options are in 339 * effect on the new filesystem). 340 */ 341 error = check_pseudo_root(rqstp, dentry, exp); 342 if (error) 343 goto out; 344 345 error = nfsd_setuser_and_check_port(rqstp, exp); 346 if (error) 347 goto out; 348 349 error = nfsd_mode_check(rqstp, dentry, type); 350 if (error) 351 goto out; 352 353 /* 354 * pseudoflavor restrictions are not enforced on NLM, 355 * which clients virtually always use auth_sys for, 356 * even while using RPCSEC_GSS for NFS. 357 */ 358 if (access & NFSD_MAY_LOCK || access & NFSD_MAY_BYPASS_GSS) 359 goto skip_pseudoflavor_check; 360 /* 361 * Clients may expect to be able to use auth_sys during mount, 362 * even if they use gss for everything else; see section 2.3.2 363 * of rfc 2623. 364 */ 365 if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT 366 && exp->ex_path.dentry == dentry) 367 goto skip_pseudoflavor_check; 368 369 error = check_nfsd_access(exp, rqstp); 370 if (error) 371 goto out; 372 373 skip_pseudoflavor_check: 374 /* Finally, check access permissions. */ 375 error = nfsd_permission(rqstp, exp, dentry, access); 376 377 if (error) { 378 dprintk("fh_verify: %pd2 permission failure, " 379 "acc=%x, error=%d\n", 380 dentry, 381 access, ntohl(error)); 382 } 383 out: 384 if (error == nfserr_stale) 385 nfsdstats.fh_stale++; 386 return error; 387 } 388 389 390 /* 391 * Compose a file handle for an NFS reply. 392 * 393 * Note that when first composed, the dentry may not yet have 394 * an inode. In this case a call to fh_update should be made 395 * before the fh goes out on the wire ... 396 */ 397 static void _fh_update(struct svc_fh *fhp, struct svc_export *exp, 398 struct dentry *dentry) 399 { 400 if (dentry != exp->ex_path.dentry) { 401 struct fid *fid = (struct fid *) 402 (fhp->fh_handle.fh_fsid + fhp->fh_handle.fh_size/4 - 1); 403 int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4; 404 int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK); 405 406 fhp->fh_handle.fh_fileid_type = 407 exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck); 408 fhp->fh_handle.fh_size += maxsize * 4; 409 } else { 410 fhp->fh_handle.fh_fileid_type = FILEID_ROOT; 411 } 412 } 413 414 /* 415 * for composing old style file handles 416 */ 417 static inline void _fh_update_old(struct dentry *dentry, 418 struct svc_export *exp, 419 struct knfsd_fh *fh) 420 { 421 fh->ofh_ino = ino_t_to_u32(d_inode(dentry)->i_ino); 422 fh->ofh_generation = d_inode(dentry)->i_generation; 423 if (d_is_dir(dentry) || 424 (exp->ex_flags & NFSEXP_NOSUBTREECHECK)) 425 fh->ofh_dirino = 0; 426 } 427 428 static bool is_root_export(struct svc_export *exp) 429 { 430 return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root; 431 } 432 433 static struct super_block *exp_sb(struct svc_export *exp) 434 { 435 return exp->ex_path.dentry->d_sb; 436 } 437 438 static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp) 439 { 440 switch (fsid_type) { 441 case FSID_DEV: 442 if (!old_valid_dev(exp_sb(exp)->s_dev)) 443 return 0; 444 /* FALL THROUGH */ 445 case FSID_MAJOR_MINOR: 446 case FSID_ENCODE_DEV: 447 return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV; 448 case FSID_NUM: 449 return exp->ex_flags & NFSEXP_FSID; 450 case FSID_UUID8: 451 case FSID_UUID16: 452 if (!is_root_export(exp)) 453 return 0; 454 /* fall through */ 455 case FSID_UUID4_INUM: 456 case FSID_UUID16_INUM: 457 return exp->ex_uuid != NULL; 458 } 459 return 1; 460 } 461 462 463 static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh) 464 { 465 u8 version; 466 u8 fsid_type; 467 retry: 468 version = 1; 469 if (ref_fh && ref_fh->fh_export == exp) { 470 version = ref_fh->fh_handle.fh_version; 471 fsid_type = ref_fh->fh_handle.fh_fsid_type; 472 473 ref_fh = NULL; 474 475 switch (version) { 476 case 0xca: 477 fsid_type = FSID_DEV; 478 break; 479 case 1: 480 break; 481 default: 482 goto retry; 483 } 484 485 /* 486 * As the fsid -> filesystem mapping was guided by 487 * user-space, there is no guarantee that the filesystem 488 * actually supports that fsid type. If it doesn't we 489 * loop around again without ref_fh set. 490 */ 491 if (!fsid_type_ok_for_exp(fsid_type, exp)) 492 goto retry; 493 } else if (exp->ex_flags & NFSEXP_FSID) { 494 fsid_type = FSID_NUM; 495 } else if (exp->ex_uuid) { 496 if (fhp->fh_maxsize >= 64) { 497 if (is_root_export(exp)) 498 fsid_type = FSID_UUID16; 499 else 500 fsid_type = FSID_UUID16_INUM; 501 } else { 502 if (is_root_export(exp)) 503 fsid_type = FSID_UUID8; 504 else 505 fsid_type = FSID_UUID4_INUM; 506 } 507 } else if (!old_valid_dev(exp_sb(exp)->s_dev)) 508 /* for newer device numbers, we must use a newer fsid format */ 509 fsid_type = FSID_ENCODE_DEV; 510 else 511 fsid_type = FSID_DEV; 512 fhp->fh_handle.fh_version = version; 513 if (version) 514 fhp->fh_handle.fh_fsid_type = fsid_type; 515 } 516 517 __be32 518 fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, 519 struct svc_fh *ref_fh) 520 { 521 /* ref_fh is a reference file handle. 522 * if it is non-null and for the same filesystem, then we should compose 523 * a filehandle which is of the same version, where possible. 524 * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca 525 * Then create a 32byte filehandle using nfs_fhbase_old 526 * 527 */ 528 529 struct inode * inode = d_inode(dentry); 530 dev_t ex_dev = exp_sb(exp)->s_dev; 531 532 dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %pd2, ino=%ld)\n", 533 MAJOR(ex_dev), MINOR(ex_dev), 534 (long) d_inode(exp->ex_path.dentry)->i_ino, 535 dentry, 536 (inode ? inode->i_ino : 0)); 537 538 /* Choose filehandle version and fsid type based on 539 * the reference filehandle (if it is in the same export) 540 * or the export options. 541 */ 542 set_version_and_fsid_type(fhp, exp, ref_fh); 543 544 if (ref_fh == fhp) 545 fh_put(ref_fh); 546 547 if (fhp->fh_locked || fhp->fh_dentry) { 548 printk(KERN_ERR "fh_compose: fh %pd2 not initialized!\n", 549 dentry); 550 } 551 if (fhp->fh_maxsize < NFS_FHSIZE) 552 printk(KERN_ERR "fh_compose: called with maxsize %d! %pd2\n", 553 fhp->fh_maxsize, 554 dentry); 555 556 fhp->fh_dentry = dget(dentry); /* our internal copy */ 557 fhp->fh_export = exp_get(exp); 558 559 if (fhp->fh_handle.fh_version == 0xca) { 560 /* old style filehandle please */ 561 memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE); 562 fhp->fh_handle.fh_size = NFS_FHSIZE; 563 fhp->fh_handle.ofh_dcookie = 0xfeebbaca; 564 fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev); 565 fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev; 566 fhp->fh_handle.ofh_xino = 567 ino_t_to_u32(d_inode(exp->ex_path.dentry)->i_ino); 568 fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry)); 569 if (inode) 570 _fh_update_old(dentry, exp, &fhp->fh_handle); 571 } else { 572 fhp->fh_handle.fh_size = 573 key_len(fhp->fh_handle.fh_fsid_type) + 4; 574 fhp->fh_handle.fh_auth_type = 0; 575 576 mk_fsid(fhp->fh_handle.fh_fsid_type, 577 fhp->fh_handle.fh_fsid, 578 ex_dev, 579 d_inode(exp->ex_path.dentry)->i_ino, 580 exp->ex_fsid, exp->ex_uuid); 581 582 if (inode) 583 _fh_update(fhp, exp, dentry); 584 if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) { 585 fh_put(fhp); 586 return nfserr_opnotsupp; 587 } 588 } 589 590 return 0; 591 } 592 593 /* 594 * Update file handle information after changing a dentry. 595 * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create 596 */ 597 __be32 598 fh_update(struct svc_fh *fhp) 599 { 600 struct dentry *dentry; 601 602 if (!fhp->fh_dentry) 603 goto out_bad; 604 605 dentry = fhp->fh_dentry; 606 if (d_really_is_negative(dentry)) 607 goto out_negative; 608 if (fhp->fh_handle.fh_version != 1) { 609 _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle); 610 } else { 611 if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT) 612 return 0; 613 614 _fh_update(fhp, fhp->fh_export, dentry); 615 if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) 616 return nfserr_opnotsupp; 617 } 618 return 0; 619 out_bad: 620 printk(KERN_ERR "fh_update: fh not verified!\n"); 621 return nfserr_serverfault; 622 out_negative: 623 printk(KERN_ERR "fh_update: %pd2 still negative!\n", 624 dentry); 625 return nfserr_serverfault; 626 } 627 628 /* 629 * Release a file handle. 630 */ 631 void 632 fh_put(struct svc_fh *fhp) 633 { 634 struct dentry * dentry = fhp->fh_dentry; 635 struct svc_export * exp = fhp->fh_export; 636 if (dentry) { 637 fh_unlock(fhp); 638 fhp->fh_dentry = NULL; 639 dput(dentry); 640 fh_clear_wcc(fhp); 641 } 642 fh_drop_write(fhp); 643 if (exp) { 644 exp_put(exp); 645 fhp->fh_export = NULL; 646 } 647 return; 648 } 649 650 /* 651 * Shorthand for dprintk()'s 652 */ 653 char * SVCFH_fmt(struct svc_fh *fhp) 654 { 655 struct knfsd_fh *fh = &fhp->fh_handle; 656 657 static char buf[80]; 658 sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x", 659 fh->fh_size, 660 fh->fh_base.fh_pad[0], 661 fh->fh_base.fh_pad[1], 662 fh->fh_base.fh_pad[2], 663 fh->fh_base.fh_pad[3], 664 fh->fh_base.fh_pad[4], 665 fh->fh_base.fh_pad[5]); 666 return buf; 667 } 668 669 enum fsid_source fsid_source(struct svc_fh *fhp) 670 { 671 if (fhp->fh_handle.fh_version != 1) 672 return FSIDSOURCE_DEV; 673 switch(fhp->fh_handle.fh_fsid_type) { 674 case FSID_DEV: 675 case FSID_ENCODE_DEV: 676 case FSID_MAJOR_MINOR: 677 if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV) 678 return FSIDSOURCE_DEV; 679 break; 680 case FSID_NUM: 681 if (fhp->fh_export->ex_flags & NFSEXP_FSID) 682 return FSIDSOURCE_FSID; 683 break; 684 default: 685 break; 686 } 687 /* either a UUID type filehandle, or the filehandle doesn't 688 * match the export. 689 */ 690 if (fhp->fh_export->ex_flags & NFSEXP_FSID) 691 return FSIDSOURCE_FSID; 692 if (fhp->fh_export->ex_uuid) 693 return FSIDSOURCE_UUID; 694 return FSIDSOURCE_DEV; 695 } 696