1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * NFS server file handle treatment. 4 * 5 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 6 * Portions Copyright (C) 1999 G. Allen Morris III <gam3@acm.org> 7 * Extensive rewrite by Neil Brown <neilb@cse.unsw.edu.au> Southern-Spring 1999 8 * ... and again Southern-Winter 2001 to support export_operations 9 */ 10 11 #include <linux/exportfs.h> 12 13 #include <linux/sunrpc/svcauth_gss.h> 14 #include "nfsd.h" 15 #include "vfs.h" 16 #include "auth.h" 17 18 #define NFSDDBG_FACILITY NFSDDBG_FH 19 20 21 /* 22 * our acceptability function. 23 * if NOSUBTREECHECK, accept anything 24 * if not, require that we can walk up to exp->ex_dentry 25 * doing some checks on the 'x' bits 26 */ 27 static int nfsd_acceptable(void *expv, struct dentry *dentry) 28 { 29 struct svc_export *exp = expv; 30 int rv; 31 struct dentry *tdentry; 32 struct dentry *parent; 33 34 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) 35 return 1; 36 37 tdentry = dget(dentry); 38 while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) { 39 /* make sure parents give x permission to user */ 40 int err; 41 parent = dget_parent(tdentry); 42 err = inode_permission(d_inode(parent), MAY_EXEC); 43 if (err < 0) { 44 dput(parent); 45 break; 46 } 47 dput(tdentry); 48 tdentry = parent; 49 } 50 if (tdentry != exp->ex_path.dentry) 51 dprintk("nfsd_acceptable failed at %p %pd\n", tdentry, tdentry); 52 rv = (tdentry == exp->ex_path.dentry); 53 dput(tdentry); 54 return rv; 55 } 56 57 /* Type check. The correct error return for type mismatches does not seem to be 58 * generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a 59 * comment in the NFSv3 spec says this is incorrect (implementation notes for 60 * the write call). 61 */ 62 static inline __be32 63 nfsd_mode_check(struct svc_rqst *rqstp, struct dentry *dentry, 64 umode_t requested) 65 { 66 umode_t mode = d_inode(dentry)->i_mode & S_IFMT; 67 68 if (requested == 0) /* the caller doesn't care */ 69 return nfs_ok; 70 if (mode == requested) { 71 if (mode == S_IFDIR && !d_can_lookup(dentry)) { 72 WARN_ON_ONCE(1); 73 return nfserr_notdir; 74 } 75 return nfs_ok; 76 } 77 /* 78 * v4 has an error more specific than err_notdir which we should 79 * return in preference to err_notdir: 80 */ 81 if (rqstp->rq_vers == 4 && mode == S_IFLNK) 82 return nfserr_symlink; 83 if (requested == S_IFDIR) 84 return nfserr_notdir; 85 if (mode == S_IFDIR) 86 return nfserr_isdir; 87 return nfserr_inval; 88 } 89 90 static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp, 91 struct svc_export *exp) 92 { 93 int flags = nfsexp_flags(rqstp, exp); 94 95 /* Check if the request originated from a secure port. */ 96 if (!test_bit(RQ_SECURE, &rqstp->rq_flags) && !(flags & NFSEXP_INSECURE_PORT)) { 97 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 98 dprintk("nfsd: request from insecure port %s!\n", 99 svc_print_addr(rqstp, buf, sizeof(buf))); 100 return nfserr_perm; 101 } 102 103 /* Set user creds for this exportpoint */ 104 return nfserrno(nfsd_setuser(rqstp, exp)); 105 } 106 107 static inline __be32 check_pseudo_root(struct svc_rqst *rqstp, 108 struct dentry *dentry, struct svc_export *exp) 109 { 110 if (!(exp->ex_flags & NFSEXP_V4ROOT)) 111 return nfs_ok; 112 /* 113 * v2/v3 clients have no need for the V4ROOT export--they use 114 * the mount protocl instead; also, further V4ROOT checks may be 115 * in v4-specific code, in which case v2/v3 clients could bypass 116 * them. 117 */ 118 if (!nfsd_v4client(rqstp)) 119 return nfserr_stale; 120 /* 121 * We're exposing only the directories and symlinks that have to be 122 * traversed on the way to real exports: 123 */ 124 if (unlikely(!d_is_dir(dentry) && 125 !d_is_symlink(dentry))) 126 return nfserr_stale; 127 /* 128 * A pseudoroot export gives permission to access only one 129 * single directory; the kernel has to make another upcall 130 * before granting access to anything else under it: 131 */ 132 if (unlikely(dentry != exp->ex_path.dentry)) 133 return nfserr_stale; 134 return nfs_ok; 135 } 136 137 /* 138 * Use the given filehandle to look up the corresponding export and 139 * dentry. On success, the results are used to set fh_export and 140 * fh_dentry. 141 */ 142 static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp) 143 { 144 struct knfsd_fh *fh = &fhp->fh_handle; 145 struct fid *fid = NULL, sfid; 146 struct svc_export *exp; 147 struct dentry *dentry; 148 int fileid_type; 149 int data_left = fh->fh_size/4; 150 __be32 error; 151 152 error = nfserr_stale; 153 if (rqstp->rq_vers > 2) 154 error = nfserr_badhandle; 155 if (rqstp->rq_vers == 4 && fh->fh_size == 0) 156 return nfserr_nofilehandle; 157 158 if (fh->fh_version == 1) { 159 int len; 160 161 if (--data_left < 0) 162 return error; 163 if (fh->fh_auth_type != 0) 164 return error; 165 len = key_len(fh->fh_fsid_type) / 4; 166 if (len == 0) 167 return error; 168 if (fh->fh_fsid_type == FSID_MAJOR_MINOR) { 169 /* deprecated, convert to type 3 */ 170 len = key_len(FSID_ENCODE_DEV)/4; 171 fh->fh_fsid_type = FSID_ENCODE_DEV; 172 /* 173 * struct knfsd_fh uses host-endian fields, which are 174 * sometimes used to hold net-endian values. This 175 * confuses sparse, so we must use __force here to 176 * keep it from complaining. 177 */ 178 fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl((__force __be32)fh->fh_fsid[0]), 179 ntohl((__force __be32)fh->fh_fsid[1]))); 180 fh->fh_fsid[1] = fh->fh_fsid[2]; 181 } 182 data_left -= len; 183 if (data_left < 0) 184 return error; 185 exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_fsid); 186 fid = (struct fid *)(fh->fh_fsid + len); 187 } else { 188 __u32 tfh[2]; 189 dev_t xdev; 190 ino_t xino; 191 192 if (fh->fh_size != NFS_FHSIZE) 193 return error; 194 /* assume old filehandle format */ 195 xdev = old_decode_dev(fh->ofh_xdev); 196 xino = u32_to_ino_t(fh->ofh_xino); 197 mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL); 198 exp = rqst_exp_find(rqstp, FSID_DEV, tfh); 199 } 200 201 error = nfserr_stale; 202 if (PTR_ERR(exp) == -ENOENT) 203 return error; 204 205 if (IS_ERR(exp)) 206 return nfserrno(PTR_ERR(exp)); 207 208 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) { 209 /* Elevate privileges so that the lack of 'r' or 'x' 210 * permission on some parent directory will 211 * not stop exportfs_decode_fh from being able 212 * to reconnect a directory into the dentry cache. 213 * The same problem can affect "SUBTREECHECK" exports, 214 * but as nfsd_acceptable depends on correct 215 * access control settings being in effect, we cannot 216 * fix that case easily. 217 */ 218 struct cred *new = prepare_creds(); 219 if (!new) { 220 error = nfserrno(-ENOMEM); 221 goto out; 222 } 223 new->cap_effective = 224 cap_raise_nfsd_set(new->cap_effective, 225 new->cap_permitted); 226 put_cred(override_creds(new)); 227 put_cred(new); 228 } else { 229 error = nfsd_setuser_and_check_port(rqstp, exp); 230 if (error) 231 goto out; 232 } 233 234 /* 235 * Look up the dentry using the NFS file handle. 236 */ 237 error = nfserr_stale; 238 if (rqstp->rq_vers > 2) 239 error = nfserr_badhandle; 240 241 if (fh->fh_version != 1) { 242 sfid.i32.ino = fh->ofh_ino; 243 sfid.i32.gen = fh->ofh_generation; 244 sfid.i32.parent_ino = fh->ofh_dirino; 245 fid = &sfid; 246 data_left = 3; 247 if (fh->ofh_dirino == 0) 248 fileid_type = FILEID_INO32_GEN; 249 else 250 fileid_type = FILEID_INO32_GEN_PARENT; 251 } else 252 fileid_type = fh->fh_fileid_type; 253 254 if (fileid_type == FILEID_ROOT) 255 dentry = dget(exp->ex_path.dentry); 256 else { 257 dentry = exportfs_decode_fh(exp->ex_path.mnt, fid, 258 data_left, fileid_type, 259 nfsd_acceptable, exp); 260 } 261 if (dentry == NULL) 262 goto out; 263 if (IS_ERR(dentry)) { 264 if (PTR_ERR(dentry) != -EINVAL) 265 error = nfserrno(PTR_ERR(dentry)); 266 goto out; 267 } 268 269 if (d_is_dir(dentry) && 270 (dentry->d_flags & DCACHE_DISCONNECTED)) { 271 printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %pd2\n", 272 dentry); 273 } 274 275 fhp->fh_dentry = dentry; 276 fhp->fh_export = exp; 277 return 0; 278 out: 279 exp_put(exp); 280 return error; 281 } 282 283 /** 284 * fh_verify - filehandle lookup and access checking 285 * @rqstp: pointer to current rpc request 286 * @fhp: filehandle to be verified 287 * @type: expected type of object pointed to by filehandle 288 * @access: type of access needed to object 289 * 290 * Look up a dentry from the on-the-wire filehandle, check the client's 291 * access to the export, and set the current task's credentials. 292 * 293 * Regardless of success or failure of fh_verify(), fh_put() should be 294 * called on @fhp when the caller is finished with the filehandle. 295 * 296 * fh_verify() may be called multiple times on a given filehandle, for 297 * example, when processing an NFSv4 compound. The first call will look 298 * up a dentry using the on-the-wire filehandle. Subsequent calls will 299 * skip the lookup and just perform the other checks and possibly change 300 * the current task's credentials. 301 * 302 * @type specifies the type of object expected using one of the S_IF* 303 * constants defined in include/linux/stat.h. The caller may use zero 304 * to indicate that it doesn't care, or a negative integer to indicate 305 * that it expects something not of the given type. 306 * 307 * @access is formed from the NFSD_MAY_* constants defined in 308 * fs/nfsd/vfs.h. 309 */ 310 __be32 311 fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access) 312 { 313 struct svc_export *exp; 314 struct dentry *dentry; 315 __be32 error; 316 317 dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp)); 318 319 if (!fhp->fh_dentry) { 320 error = nfsd_set_fh_dentry(rqstp, fhp); 321 if (error) 322 goto out; 323 } 324 dentry = fhp->fh_dentry; 325 exp = fhp->fh_export; 326 /* 327 * We still have to do all these permission checks, even when 328 * fh_dentry is already set: 329 * - fh_verify may be called multiple times with different 330 * "access" arguments (e.g. nfsd_proc_create calls 331 * fh_verify(...,NFSD_MAY_EXEC) first, then later (in 332 * nfsd_create) calls fh_verify(...,NFSD_MAY_CREATE). 333 * - in the NFSv4 case, the filehandle may have been filled 334 * in by fh_compose, and given a dentry, but further 335 * compound operations performed with that filehandle 336 * still need permissions checks. In the worst case, a 337 * mountpoint crossing may have changed the export 338 * options, and we may now need to use a different uid 339 * (for example, if different id-squashing options are in 340 * effect on the new filesystem). 341 */ 342 error = check_pseudo_root(rqstp, dentry, exp); 343 if (error) 344 goto out; 345 346 error = nfsd_setuser_and_check_port(rqstp, exp); 347 if (error) 348 goto out; 349 350 error = nfsd_mode_check(rqstp, dentry, type); 351 if (error) 352 goto out; 353 354 /* 355 * pseudoflavor restrictions are not enforced on NLM, 356 * which clients virtually always use auth_sys for, 357 * even while using RPCSEC_GSS for NFS. 358 */ 359 if (access & NFSD_MAY_LOCK || access & NFSD_MAY_BYPASS_GSS) 360 goto skip_pseudoflavor_check; 361 /* 362 * Clients may expect to be able to use auth_sys during mount, 363 * even if they use gss for everything else; see section 2.3.2 364 * of rfc 2623. 365 */ 366 if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT 367 && exp->ex_path.dentry == dentry) 368 goto skip_pseudoflavor_check; 369 370 error = check_nfsd_access(exp, rqstp); 371 if (error) 372 goto out; 373 374 skip_pseudoflavor_check: 375 /* Finally, check access permissions. */ 376 error = nfsd_permission(rqstp, exp, dentry, access); 377 378 if (error) { 379 dprintk("fh_verify: %pd2 permission failure, " 380 "acc=%x, error=%d\n", 381 dentry, 382 access, ntohl(error)); 383 } 384 out: 385 if (error == nfserr_stale) 386 nfsdstats.fh_stale++; 387 return error; 388 } 389 390 391 /* 392 * Compose a file handle for an NFS reply. 393 * 394 * Note that when first composed, the dentry may not yet have 395 * an inode. In this case a call to fh_update should be made 396 * before the fh goes out on the wire ... 397 */ 398 static void _fh_update(struct svc_fh *fhp, struct svc_export *exp, 399 struct dentry *dentry) 400 { 401 if (dentry != exp->ex_path.dentry) { 402 struct fid *fid = (struct fid *) 403 (fhp->fh_handle.fh_fsid + fhp->fh_handle.fh_size/4 - 1); 404 int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4; 405 int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK); 406 407 fhp->fh_handle.fh_fileid_type = 408 exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck); 409 fhp->fh_handle.fh_size += maxsize * 4; 410 } else { 411 fhp->fh_handle.fh_fileid_type = FILEID_ROOT; 412 } 413 } 414 415 /* 416 * for composing old style file handles 417 */ 418 static inline void _fh_update_old(struct dentry *dentry, 419 struct svc_export *exp, 420 struct knfsd_fh *fh) 421 { 422 fh->ofh_ino = ino_t_to_u32(d_inode(dentry)->i_ino); 423 fh->ofh_generation = d_inode(dentry)->i_generation; 424 if (d_is_dir(dentry) || 425 (exp->ex_flags & NFSEXP_NOSUBTREECHECK)) 426 fh->ofh_dirino = 0; 427 } 428 429 static bool is_root_export(struct svc_export *exp) 430 { 431 return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root; 432 } 433 434 static struct super_block *exp_sb(struct svc_export *exp) 435 { 436 return exp->ex_path.dentry->d_sb; 437 } 438 439 static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp) 440 { 441 switch (fsid_type) { 442 case FSID_DEV: 443 if (!old_valid_dev(exp_sb(exp)->s_dev)) 444 return 0; 445 /* FALL THROUGH */ 446 case FSID_MAJOR_MINOR: 447 case FSID_ENCODE_DEV: 448 return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV; 449 case FSID_NUM: 450 return exp->ex_flags & NFSEXP_FSID; 451 case FSID_UUID8: 452 case FSID_UUID16: 453 if (!is_root_export(exp)) 454 return 0; 455 /* fall through */ 456 case FSID_UUID4_INUM: 457 case FSID_UUID16_INUM: 458 return exp->ex_uuid != NULL; 459 } 460 return 1; 461 } 462 463 464 static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh) 465 { 466 u8 version; 467 u8 fsid_type; 468 retry: 469 version = 1; 470 if (ref_fh && ref_fh->fh_export == exp) { 471 version = ref_fh->fh_handle.fh_version; 472 fsid_type = ref_fh->fh_handle.fh_fsid_type; 473 474 ref_fh = NULL; 475 476 switch (version) { 477 case 0xca: 478 fsid_type = FSID_DEV; 479 break; 480 case 1: 481 break; 482 default: 483 goto retry; 484 } 485 486 /* 487 * As the fsid -> filesystem mapping was guided by 488 * user-space, there is no guarantee that the filesystem 489 * actually supports that fsid type. If it doesn't we 490 * loop around again without ref_fh set. 491 */ 492 if (!fsid_type_ok_for_exp(fsid_type, exp)) 493 goto retry; 494 } else if (exp->ex_flags & NFSEXP_FSID) { 495 fsid_type = FSID_NUM; 496 } else if (exp->ex_uuid) { 497 if (fhp->fh_maxsize >= 64) { 498 if (is_root_export(exp)) 499 fsid_type = FSID_UUID16; 500 else 501 fsid_type = FSID_UUID16_INUM; 502 } else { 503 if (is_root_export(exp)) 504 fsid_type = FSID_UUID8; 505 else 506 fsid_type = FSID_UUID4_INUM; 507 } 508 } else if (!old_valid_dev(exp_sb(exp)->s_dev)) 509 /* for newer device numbers, we must use a newer fsid format */ 510 fsid_type = FSID_ENCODE_DEV; 511 else 512 fsid_type = FSID_DEV; 513 fhp->fh_handle.fh_version = version; 514 if (version) 515 fhp->fh_handle.fh_fsid_type = fsid_type; 516 } 517 518 __be32 519 fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, 520 struct svc_fh *ref_fh) 521 { 522 /* ref_fh is a reference file handle. 523 * if it is non-null and for the same filesystem, then we should compose 524 * a filehandle which is of the same version, where possible. 525 * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca 526 * Then create a 32byte filehandle using nfs_fhbase_old 527 * 528 */ 529 530 struct inode * inode = d_inode(dentry); 531 dev_t ex_dev = exp_sb(exp)->s_dev; 532 533 dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %pd2, ino=%ld)\n", 534 MAJOR(ex_dev), MINOR(ex_dev), 535 (long) d_inode(exp->ex_path.dentry)->i_ino, 536 dentry, 537 (inode ? inode->i_ino : 0)); 538 539 /* Choose filehandle version and fsid type based on 540 * the reference filehandle (if it is in the same export) 541 * or the export options. 542 */ 543 set_version_and_fsid_type(fhp, exp, ref_fh); 544 545 if (ref_fh == fhp) 546 fh_put(ref_fh); 547 548 if (fhp->fh_locked || fhp->fh_dentry) { 549 printk(KERN_ERR "fh_compose: fh %pd2 not initialized!\n", 550 dentry); 551 } 552 if (fhp->fh_maxsize < NFS_FHSIZE) 553 printk(KERN_ERR "fh_compose: called with maxsize %d! %pd2\n", 554 fhp->fh_maxsize, 555 dentry); 556 557 fhp->fh_dentry = dget(dentry); /* our internal copy */ 558 fhp->fh_export = exp_get(exp); 559 560 if (fhp->fh_handle.fh_version == 0xca) { 561 /* old style filehandle please */ 562 memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE); 563 fhp->fh_handle.fh_size = NFS_FHSIZE; 564 fhp->fh_handle.ofh_dcookie = 0xfeebbaca; 565 fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev); 566 fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev; 567 fhp->fh_handle.ofh_xino = 568 ino_t_to_u32(d_inode(exp->ex_path.dentry)->i_ino); 569 fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry)); 570 if (inode) 571 _fh_update_old(dentry, exp, &fhp->fh_handle); 572 } else { 573 fhp->fh_handle.fh_size = 574 key_len(fhp->fh_handle.fh_fsid_type) + 4; 575 fhp->fh_handle.fh_auth_type = 0; 576 577 mk_fsid(fhp->fh_handle.fh_fsid_type, 578 fhp->fh_handle.fh_fsid, 579 ex_dev, 580 d_inode(exp->ex_path.dentry)->i_ino, 581 exp->ex_fsid, exp->ex_uuid); 582 583 if (inode) 584 _fh_update(fhp, exp, dentry); 585 if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) { 586 fh_put(fhp); 587 return nfserr_opnotsupp; 588 } 589 } 590 591 return 0; 592 } 593 594 /* 595 * Update file handle information after changing a dentry. 596 * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create 597 */ 598 __be32 599 fh_update(struct svc_fh *fhp) 600 { 601 struct dentry *dentry; 602 603 if (!fhp->fh_dentry) 604 goto out_bad; 605 606 dentry = fhp->fh_dentry; 607 if (d_really_is_negative(dentry)) 608 goto out_negative; 609 if (fhp->fh_handle.fh_version != 1) { 610 _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle); 611 } else { 612 if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT) 613 return 0; 614 615 _fh_update(fhp, fhp->fh_export, dentry); 616 if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) 617 return nfserr_opnotsupp; 618 } 619 return 0; 620 out_bad: 621 printk(KERN_ERR "fh_update: fh not verified!\n"); 622 return nfserr_serverfault; 623 out_negative: 624 printk(KERN_ERR "fh_update: %pd2 still negative!\n", 625 dentry); 626 return nfserr_serverfault; 627 } 628 629 /* 630 * Release a file handle. 631 */ 632 void 633 fh_put(struct svc_fh *fhp) 634 { 635 struct dentry * dentry = fhp->fh_dentry; 636 struct svc_export * exp = fhp->fh_export; 637 if (dentry) { 638 fh_unlock(fhp); 639 fhp->fh_dentry = NULL; 640 dput(dentry); 641 fh_clear_wcc(fhp); 642 } 643 fh_drop_write(fhp); 644 if (exp) { 645 exp_put(exp); 646 fhp->fh_export = NULL; 647 } 648 return; 649 } 650 651 /* 652 * Shorthand for dprintk()'s 653 */ 654 char * SVCFH_fmt(struct svc_fh *fhp) 655 { 656 struct knfsd_fh *fh = &fhp->fh_handle; 657 658 static char buf[80]; 659 sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x", 660 fh->fh_size, 661 fh->fh_base.fh_pad[0], 662 fh->fh_base.fh_pad[1], 663 fh->fh_base.fh_pad[2], 664 fh->fh_base.fh_pad[3], 665 fh->fh_base.fh_pad[4], 666 fh->fh_base.fh_pad[5]); 667 return buf; 668 } 669 670 enum fsid_source fsid_source(struct svc_fh *fhp) 671 { 672 if (fhp->fh_handle.fh_version != 1) 673 return FSIDSOURCE_DEV; 674 switch(fhp->fh_handle.fh_fsid_type) { 675 case FSID_DEV: 676 case FSID_ENCODE_DEV: 677 case FSID_MAJOR_MINOR: 678 if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV) 679 return FSIDSOURCE_DEV; 680 break; 681 case FSID_NUM: 682 if (fhp->fh_export->ex_flags & NFSEXP_FSID) 683 return FSIDSOURCE_FSID; 684 break; 685 default: 686 break; 687 } 688 /* either a UUID type filehandle, or the filehandle doesn't 689 * match the export. 690 */ 691 if (fhp->fh_export->ex_flags & NFSEXP_FSID) 692 return FSIDSOURCE_FSID; 693 if (fhp->fh_export->ex_uuid) 694 return FSIDSOURCE_UUID; 695 return FSIDSOURCE_DEV; 696 } 697